From 5dcb34bbc3f3274b37a71a71f1b60ac96782a5ed Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 25 Feb 2015 16:06:09 +0100 Subject: serial: pl010 is no longer broken As more ARM platforms are moving into ARCH_MULTIPLATFORM, we can now have integrator and versatile in the same kernel, and first one selects this driver, causing a Kconfig warning: warning: (ARCH_INTEGRATOR_AP) selects SERIAL_AMBA_PL010 which has unmet direct dependencies (TTY && HAS_IOMEM && ARM_AMBA && (BROKEN || !ARCH_VERSATILE)) It turns out that it has not been broken on versatile for a long time, so we can remove the statement here. Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index d2501f01cd03..bbb12794cc8c 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -20,7 +20,7 @@ comment "Non-8250 serial port support" config SERIAL_AMBA_PL010 tristate "ARM AMBA PL010 serial port support" - depends on ARM_AMBA && (BROKEN || !ARCH_VERSATILE) + depends on ARM_AMBA select SERIAL_CORE help This selects the ARM(R) AMBA(R) PrimeCell PL010 UART. If you have -- cgit From 97f9f707d26dfe34368a5b88f1996f2eaf973b42 Mon Sep 17 00:00:00 2001 From: Fabian Frederick Date: Fri, 20 Feb 2015 19:12:57 +0100 Subject: serial: core: replace current->state by __set_current_state() Use helper functions to access current->state. Direct assignments are prone to races and therefore buggy. Thanks to Peter Zijlstra for the exact definition of the problem. Suggested-By: Peter Zijlstra Signed-off-by: Fabian Frederick Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_core.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 6a1055ae3437..63d29473c703 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1118,8 +1118,7 @@ uart_wait_modem_status(struct uart_state *state, unsigned long arg) cprev = cnow; } - - current->state = TASK_RUNNING; + __set_current_state(TASK_RUNNING); remove_wait_queue(&port->delta_msr_wait, &wait); return ret; -- cgit From 213dce3c17a6536e6f28548085dc9de2dae77eca Mon Sep 17 00:00:00 2001 From: Kevin Hao Date: Sat, 31 Jan 2015 21:47:43 +0800 Subject: tty: kconfig: remove the superfluous dependency on PPC_OF In the current kernel, the CONFIG_PPC_OF is always 'y' for the ppc arch. So we don't need to check it with other ppc specific options. Signed-off-by: Kevin Hao Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index bbb12794cc8c..2b619e511b9e 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -835,7 +835,7 @@ config SERIAL_MCF_CONSOLE config SERIAL_PMACZILOG tristate "Mac or PowerMac z85c30 ESCC support" - depends on (M68K && MAC) || (PPC_OF && PPC_PMAC) + depends on (M68K && MAC) || PPC_PMAC select SERIAL_CORE help This driver supports the Zilog z85C30 serial ports found on @@ -1153,7 +1153,7 @@ config SERIAL_OMAP_CONSOLE config SERIAL_OF_PLATFORM_NWPSERIAL tristate "NWP serial port driver" - depends on PPC_OF && PPC_DCR + depends on PPC_DCR select SERIAL_OF_PLATFORM select SERIAL_CORE_CONSOLE select SERIAL_CORE -- cgit From 61702c3e4f064250d11395fce7d3242a2cfcf9c1 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 2 Feb 2015 14:53:26 +0200 Subject: serial: 8250_pci: convert to dev_pm_ops Convert the legacy system PM callbacks to new ones. Meanwhile, remove the redudant calls to the PCI for changing a power state since it's done by bus code. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 31 +++++++++++++++---------------- 1 file changed, 15 insertions(+), 16 deletions(-) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index daf2c82984e9..fbe919410e0f 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -4020,41 +4020,41 @@ static void pciserial_remove_one(struct pci_dev *dev) pci_disable_device(dev); } -#ifdef CONFIG_PM -static int pciserial_suspend_one(struct pci_dev *dev, pm_message_t state) +#ifdef CONFIG_PM_SLEEP +static int pciserial_suspend_one(struct device *dev) { - struct serial_private *priv = pci_get_drvdata(dev); + struct pci_dev *pdev = to_pci_dev(dev); + struct serial_private *priv = pci_get_drvdata(pdev); if (priv) pciserial_suspend_ports(priv); - pci_save_state(dev); - pci_set_power_state(dev, pci_choose_state(dev, state)); return 0; } -static int pciserial_resume_one(struct pci_dev *dev) +static int pciserial_resume_one(struct device *dev) { + struct pci_dev *pdev = to_pci_dev(dev); + struct serial_private *priv = pci_get_drvdata(pdev); int err; - struct serial_private *priv = pci_get_drvdata(dev); - - pci_set_power_state(dev, PCI_D0); - pci_restore_state(dev); if (priv) { /* * The device may have been disabled. Re-enable it. */ - err = pci_enable_device(dev); + err = pci_enable_device(pdev); /* FIXME: We cannot simply error out here */ if (err) - dev_err(&dev->dev, "Unable to re-enable ports, trying to continue.\n"); + dev_err(dev, "Unable to re-enable ports, trying to continue.\n"); pciserial_resume_ports(priv); } return 0; } #endif +static SIMPLE_DEV_PM_OPS(pciserial_pm_ops, pciserial_suspend_one, + pciserial_resume_one); + static struct pci_device_id serial_pci_tbl[] = { /* Advantech use PCI_DEVICE_ID_ADVANTECH_PCI3620 (0x3620) as 'PCI_SUBVENDOR_ID' */ { PCI_VENDOR_ID_ADVANTECH, PCI_DEVICE_ID_ADVANTECH_PCI3620, @@ -5528,10 +5528,9 @@ static struct pci_driver serial_pci_driver = { .name = "serial", .probe = pciserial_init_one, .remove = pciserial_remove_one, -#ifdef CONFIG_PM - .suspend = pciserial_suspend_one, - .resume = pciserial_resume_one, -#endif + .driver = { + .pm = &pciserial_pm_ops, + }, .id_table = serial_pci_tbl, .err_handler = &serial8250_err_handler, }; -- cgit From 6ae4a16cf4b6d449778697701de1b2ea86726def Mon Sep 17 00:00:00 2001 From: Michal Simek Date: Tue, 3 Feb 2015 11:01:47 +0100 Subject: tty: serial: 8250_core: Remove trailing whitespaces No functional changes. Signed-off-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e3b9570a1eff..463425721866 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -895,7 +895,7 @@ static int broken_efr(struct uart_8250_port *up) /* * Exar ST16C2550 "A2" devices incorrectly detect as * having an EFR, and report an ID of 0x0201. See - * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html + * http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-11/4812.html */ if (autoconfig_read_divisor_id(up) == 0x0201 && size_fifo(up) == 16) return 1; @@ -1260,7 +1260,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) serial_out(up, UART_LCR, save_lcr); port->fifosize = uart_config[up->port.type].fifo_size; - old_capabilities = up->capabilities; + old_capabilities = up->capabilities; up->capabilities = uart_config[port->type].flags; up->tx_loadsz = uart_config[port->type].tx_loadsz; -- cgit From ad3d4fdc8ee6d268d90d1a29bccd5318fa071cab Mon Sep 17 00:00:00 2001 From: Sanjeev Sharma Date: Tue, 3 Feb 2015 16:16:06 +0530 Subject: serial:imx make of_device_id array const Make of_device_id array const. Signed-off-by: Sanjeev Sharma Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 0eb29b1c47ac..412bfbf8730b 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -273,7 +273,7 @@ static struct platform_device_id imx_uart_devtype[] = { }; MODULE_DEVICE_TABLE(platform, imx_uart_devtype); -static struct of_device_id imx_uart_dt_ids[] = { +static const struct of_device_id imx_uart_dt_ids[] = { { .compatible = "fsl,imx6q-uart", .data = &imx_uart_devdata[IMX6Q_UART], }, { .compatible = "fsl,imx1-uart", .data = &imx_uart_devdata[IMX1_UART], }, { .compatible = "fsl,imx21-uart", .data = &imx_uart_devdata[IMX21_UART], }, -- cgit From b51e3f5ad5b2618702d689942dfaf7b15ea5eba4 Mon Sep 17 00:00:00 2001 From: Paul Bolle Date: Tue, 3 Feb 2015 21:05:50 +0100 Subject: sprd_serial: compile sprd_suspend and sprd_resume conditionally MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Building sprd_serial.o when CONFIG_PM_SLEEP is not defined triggers these warnings: drivers/tty/serial/sprd_serial.c:755:12: warning: ‘sprd_suspend’ defined but not used [-Wunused-function] static int sprd_suspend(struct device *dev) ^ drivers/tty/serial/sprd_serial.c:764:12: warning: ‘sprd_resume’ defined but not used [-Wunused-function] static int sprd_resume(struct device *dev) ^ Let's compile these functions only when CONFIG_PM_SLEEP is defined. Signed-off-by: Paul Bolle Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sprd_serial.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index 594b63331ef4..be3ed3f4ad60 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -752,6 +752,7 @@ static int sprd_probe(struct platform_device *pdev) return ret; } +#ifdef CONFIG_PM_SLEEP static int sprd_suspend(struct device *dev) { struct sprd_uart_port *sup = dev_get_drvdata(dev); @@ -769,6 +770,7 @@ static int sprd_resume(struct device *dev) return 0; } +#endif static SIMPLE_DEV_PM_OPS(sprd_pm_ops, sprd_suspend, sprd_resume); -- cgit From f3ac3fc287818a63072618b091074267bfa5184d Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Wed, 4 Feb 2015 15:03:48 +0200 Subject: serial: 8250_dw: Add missing MODULE_ALIAS() for module autoloading support Without this the module does not load automatically whenever suitable platform device appears. Reported-by: Jerome Blin Signed-off-by: Mika Westerberg Reviewed-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index e60116235836..f426acc8c6b5 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -608,3 +608,4 @@ module_platform_driver(dw8250_platform_driver); MODULE_AUTHOR("Jamie Iles"); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Synopsys DesignWare 8250 serial port driver"); +MODULE_ALIAS("platform:dw-apb-uart"); -- cgit From 16420ad05cdf82b27655a1e4554a8379a06c8075 Mon Sep 17 00:00:00 2001 From: "Lad, Prabhakar" Date: Wed, 4 Feb 2015 18:21:22 +0000 Subject: tty: serial/bcm63xx_uart: fix sparse warning this patch fixes following sparse warnings: bcm63xx_uart.c:857:43: warning: Using plain integer as NULL pointer bcm63xx_uart.c:871:35: warning: Using plain integer as NULL pointer Signed-off-by: Lad, Prabhakar Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/bcm63xx_uart.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/bcm63xx_uart.c b/drivers/tty/serial/bcm63xx_uart.c index 01d83df08e3d..681e0f3d5e0e 100644 --- a/drivers/tty/serial/bcm63xx_uart.c +++ b/drivers/tty/serial/bcm63xx_uart.c @@ -854,7 +854,7 @@ static int bcm_uart_probe(struct platform_device *pdev) ret = uart_add_one_port(&bcm_uart_driver, port); if (ret) { - ports[pdev->id].membase = 0; + ports[pdev->id].membase = NULL; return ret; } platform_set_drvdata(pdev, port); @@ -868,7 +868,7 @@ static int bcm_uart_remove(struct platform_device *pdev) port = platform_get_drvdata(pdev); uart_remove_one_port(&bcm_uart_driver, port); /* mark port as free */ - ports[pdev->id].membase = 0; + ports[pdev->id].membase = NULL; return 0; } -- cgit From 4f86a95d75386b47178335599264a000601e01ed Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Sat, 7 Feb 2015 15:46:41 -0200 Subject: serial: imx: Do not store/restore the UBRC register UBRC is a read-only register, so we should not store and restore it inside imx_flush_buffer(). Reported-by: Fugang Duan Signed-off-by: Fabio Estevam Acked-by: Fugang Duan Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 412bfbf8730b..ca00b3f1520f 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1320,7 +1320,7 @@ static void imx_flush_buffer(struct uart_port *port) struct imx_port *sport = (struct imx_port *)port; struct scatterlist *sgl = &sport->tx_sgl[0]; unsigned long temp; - int i = 100, ubir, ubmr, ubrc, uts; + int i = 100, ubir, ubmr, uts; if (!sport->dma_chan_tx) return; @@ -1345,7 +1345,6 @@ static void imx_flush_buffer(struct uart_port *port) */ ubir = readl(sport->port.membase + UBIR); ubmr = readl(sport->port.membase + UBMR); - ubrc = readl(sport->port.membase + UBRC); uts = readl(sport->port.membase + IMX21_UTS); temp = readl(sport->port.membase + UCR2); @@ -1358,7 +1357,6 @@ static void imx_flush_buffer(struct uart_port *port) /* Restore the registers */ writel(ubir, sport->port.membase + UBIR); writel(ubmr, sport->port.membase + UBMR); - writel(ubrc, sport->port.membase + UBRC); writel(uts, sport->port.membase + IMX21_UTS); } -- cgit From c89b73703ea3e61ab233560d2c6c4fc0963111dc Mon Sep 17 00:00:00 2001 From: Nicholas Mc Guire Date: Mon, 9 Feb 2015 09:41:49 -0500 Subject: tty: max3100: use msecs_to_jiffies for time conversion This is only an API consolidation and should make things more readable it replaces var * HZ / 1000 by msecs_to_jiffies(var). Signed-off-by: Nicholas Mc Guire Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/max3100.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c index 79f9a9eff545..077377259a2c 100644 --- a/drivers/tty/serial/max3100.c +++ b/drivers/tty/serial/max3100.c @@ -782,7 +782,7 @@ static int max3100_probe(struct spi_device *spi) pdata = dev_get_platdata(&spi->dev); max3100s[i]->crystal = pdata->crystal; max3100s[i]->loopback = pdata->loopback; - max3100s[i]->poll_time = pdata->poll_time * HZ / 1000; + max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) max3100s[i]->poll_time = 1; max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; -- cgit From 722ccf416ac2804cdb9b5c84e81524fab775a577 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Thu, 12 Feb 2015 15:24:38 +0100 Subject: serial: atmel: fix error handling when mctrl_gpio_init fails MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit mctrl_gpio_init at present doesn't return NULL. (It might be used in the future when no gpios are to be used indicating success.) Properly pass error returned and also make driver probing fail on error. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 846552bff67d..4031dc367d3b 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -2542,8 +2542,8 @@ static int atmel_init_gpios(struct atmel_uart_port *p, struct device *dev) struct gpio_desc *gpiod; p->gpios = mctrl_gpio_init(dev, 0); - if (IS_ERR_OR_NULL(p->gpios)) - return -1; + if (IS_ERR(p->gpios)) + return PTR_ERR(p->gpios); for (i = 0; i < UART_GPIO_MAX; i++) { gpiod = mctrl_gpio_to_gpiod(p->gpios, i); @@ -2594,9 +2594,10 @@ static int atmel_serial_probe(struct platform_device *pdev) port->uart.line = ret; ret = atmel_init_gpios(port, &pdev->dev); - if (ret < 0) - dev_err(&pdev->dev, "%s", - "Failed to initialize GPIOs. The serial port may not work as expected"); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to initialize GPIOs."); + goto err; + } ret = atmel_init_port(port, pdev); if (ret) -- cgit From f059a455fc979e0e7f155d98bf628fccab1c5b88 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Thu, 12 Feb 2015 15:24:39 +0100 Subject: serial: clps711x: fail if mctrl_gpio_init fails MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit mctrl_gpio_init is fully aware of being optional. If it returns an error code this indicates a real error that must not be ignored. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/clps711x.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c index 6e11c275f2ab..d5d2dd7c7917 100644 --- a/drivers/tty/serial/clps711x.c +++ b/drivers/tty/serial/clps711x.c @@ -501,6 +501,8 @@ static int uart_clps711x_probe(struct platform_device *pdev) platform_set_drvdata(pdev, s); s->gpios = mctrl_gpio_init(&pdev->dev, 0); + if (IS_ERR(s->gpios)) + return PTR_ERR(s->gpios); ret = uart_add_one_port(&clps711x_uart, &s->port); if (ret) -- cgit From 343fda95481a7254fd81342370ba04ab255f95fe Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Thu, 12 Feb 2015 15:24:40 +0100 Subject: serial: mxs-auart: properly handle mctrl_gpio failing MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If mctrl_gpio_init returns an error code this value should be forwarded and the driver must not simply ignore this failure. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mxs-auart.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index d1298b6cc68e..9abdccf5bfb2 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1155,14 +1155,14 @@ static int serial_mxs_probe_dt(struct mxs_auart_port *s, return 0; } -static bool mxs_auart_init_gpios(struct mxs_auart_port *s, struct device *dev) +static int mxs_auart_init_gpios(struct mxs_auart_port *s, struct device *dev) { enum mctrl_gpio_idx i; struct gpio_desc *gpiod; s->gpios = mctrl_gpio_init(dev, 0); - if (IS_ERR_OR_NULL(s->gpios)) - return false; + if (IS_ERR(s->gpios)) + return PTR_ERR(s->gpios); /* Block (enabled before) DMA option if RTS or CTS is GPIO line */ if (!RTS_AT_AUART() || !CTS_AT_AUART()) { @@ -1180,7 +1180,7 @@ static bool mxs_auart_init_gpios(struct mxs_auart_port *s, struct device *dev) s->gpio_irq[i] = -EINVAL; } - return true; + return 0; } static void mxs_auart_free_gpio_irq(struct mxs_auart_port *s) @@ -1276,9 +1276,11 @@ static int mxs_auart_probe(struct platform_device *pdev) platform_set_drvdata(pdev, s); - if (!mxs_auart_init_gpios(s, &pdev->dev)) - dev_err(&pdev->dev, - "Failed to initialize GPIOs. The serial port may not work as expected\n"); + ret = mxs_auart_init_gpios(s, &pdev->dev); + if (ret) { + dev_err(&pdev->dev, "Failed to initialize GPIOs.\n"); + got out_free_irq; + } /* * Get the GPIO lines IRQ -- cgit From 9e9f079c56517568868788945dc4a080de6e150b Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Thu, 12 Feb 2015 15:24:41 +0100 Subject: serial: mctrl-gpio: don't check for struct mctrl_gpios * to be invalid MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Drivers using mctrl-gpio must not pass invalid values for struct mctrl_gpios *. All drivers were fixed in this regard and so some checks can go away or be simplified. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_mctrl_gpio.c | 20 ++------------------ 1 file changed, 2 insertions(+), 18 deletions(-) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index a38596c5194e..c0381a09f12d 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -48,9 +48,6 @@ void mctrl_gpio_set(struct mctrl_gpios *gpios, unsigned int mctrl) int value_array[UART_GPIO_MAX]; unsigned int count = 0; - if (IS_ERR_OR_NULL(gpios)) - return; - for (i = 0; i < UART_GPIO_MAX; i++) if (!IS_ERR_OR_NULL(gpios->gpio[i]) && mctrl_gpios_desc[i].dir_out) { @@ -65,10 +62,7 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set); struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { - if (!IS_ERR_OR_NULL(gpios) && !IS_ERR_OR_NULL(gpios->gpio[gidx])) - return gpios->gpio[gidx]; - else - return NULL; + return gpios->gpio[gidx]; } EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod); @@ -76,15 +70,8 @@ unsigned int mctrl_gpio_get(struct mctrl_gpios *gpios, unsigned int *mctrl) { enum mctrl_gpio_idx i; - /* - * return it unchanged if the structure is not allocated - */ - if (IS_ERR_OR_NULL(gpios)) - return *mctrl; - for (i = 0; i < UART_GPIO_MAX; i++) { - if (!IS_ERR_OR_NULL(gpios->gpio[i]) && - !mctrl_gpios_desc[i].dir_out) { + if (gpios->gpio[i] && !mctrl_gpios_desc[i].dir_out) { if (gpiod_get_value(gpios->gpio[i])) *mctrl |= mctrl_gpios_desc[i].mctrl; else @@ -138,9 +125,6 @@ void mctrl_gpio_free(struct device *dev, struct mctrl_gpios *gpios) { enum mctrl_gpio_idx i; - if (IS_ERR_OR_NULL(gpios)) - return; - for (i = 0; i < UART_GPIO_MAX; i++) if (!IS_ERR_OR_NULL(gpios->gpio[i])) devm_gpiod_put(dev, gpios->gpio[i]); -- cgit From 1d267ea6539f266352f4739c718e278dc62b1df7 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Thu, 12 Feb 2015 15:24:42 +0100 Subject: serial: mctrl-gpio: simplify init routine MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Instead of ignoring errors returned by devm_gpiod_get_index use devm_gpiod_get_index_optional which results in slightly more strict error handling which is good. Also use the fourth parameter to devm_gpiod_get_index_optional to be able to drop the explicit direction setting. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_mctrl_gpio.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index c0381a09f12d..5027db7b5814 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -94,27 +94,20 @@ struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx) return ERR_PTR(-ENOMEM); for (i = 0; i < UART_GPIO_MAX; i++) { - gpios->gpio[i] = devm_gpiod_get_index(dev, - mctrl_gpios_desc[i].name, - idx); - - /* - * The GPIOs are maybe not all filled, - * this is not an error. - */ - if (IS_ERR_OR_NULL(gpios->gpio[i])) - continue; + enum gpiod_flags flags; if (mctrl_gpios_desc[i].dir_out) - err = gpiod_direction_output(gpios->gpio[i], 0); + flags = GPIOD_OUT_LOW; else - err = gpiod_direction_input(gpios->gpio[i]); - if (err) { - dev_dbg(dev, "Unable to set direction for %s GPIO", - mctrl_gpios_desc[i].name); - devm_gpiod_put(dev, gpios->gpio[i]); - gpios->gpio[i] = NULL; - } + flags = GPIOD_IN; + + gpios->gpio[i] = + devm_gpiod_get_index_optional(dev, + mctrl_gpios_desc[i].name, + idx, flags); + + if (IS_ERR(gpios->gpio[i])) + return PTR_ERR(gpios->gpio[i]); } return gpios; -- cgit From bb8478d7d676802211a9a5d77bd0f87899900e41 Mon Sep 17 00:00:00 2001 From: Axel Lin Date: Mon, 23 Feb 2015 11:34:30 +0800 Subject: serial: ar933x_uart: Fix off-by-one for checking valid alias id Current code uses the alias id as array subscript of ar933x_console_ports. So the valid id is 0 ... CONFIG_SERIAL_AR933X_NR_UARTS - 1. Signed-off-by: Axel Lin Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/ar933x_uart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/ar933x_uart.c b/drivers/tty/serial/ar933x_uart.c index 77fc9faa74a4..1519d2ca7705 100644 --- a/drivers/tty/serial/ar933x_uart.c +++ b/drivers/tty/serial/ar933x_uart.c @@ -649,7 +649,7 @@ static int ar933x_uart_probe(struct platform_device *pdev) id = 0; } - if (id > CONFIG_SERIAL_AR933X_NR_UARTS) + if (id >= CONFIG_SERIAL_AR933X_NR_UARTS) return -EINVAL; irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); -- cgit From 84e0185efaf8de931e1aab0687d8f8acd186a1c0 Mon Sep 17 00:00:00 2001 From: Joseph Kogut Date: Sun, 22 Feb 2015 17:26:57 -0700 Subject: tty: serial: s/Medfile/Medfield Fixed misspelling of 'Medfield' Signed-off-by: Joseph Kogut Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 2b619e511b9e..60c368a5dbf1 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -489,7 +489,7 @@ config SERIAL_MFD_HSU select SERIAL_CORE config SERIAL_MFD_HSU_CONSOLE - bool "Medfile HSU serial console support" + bool "Medfield HSU serial console support" depends on SERIAL_MFD_HSU=y select SERIAL_CORE_CONSOLE -- cgit From 2b49e0c56741fca538176f66ed3c8d16ce4fccd8 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 23 Feb 2015 16:24:42 +0200 Subject: dmaengine: append hsu DMA driver The HSU DMA is developed to support High Speed UART controllers found in particular on Intel MID platforms such as Intel Medfield. The existing implementation is tighten to the drivers/tty/serial/mfd.c driver and has a lot of disadvantages. Besides that we would like to get rid of the old HS UART driver in regarding to extending the 8250 which supports generic DMAEngine API. That's why the current driver has been developed. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/dma/Kconfig | 2 + drivers/dma/Makefile | 1 + drivers/dma/hsu/Kconfig | 14 + drivers/dma/hsu/Makefile | 5 + drivers/dma/hsu/hsu.c | 504 ++++++++++++++++++++++++++++++++++ drivers/dma/hsu/hsu.h | 118 ++++++++ drivers/dma/hsu/pci.c | 123 +++++++++ include/linux/dma/hsu.h | 48 ++++ include/linux/platform_data/dma-hsu.h | 25 ++ 9 files changed, 840 insertions(+) create mode 100644 drivers/dma/hsu/Kconfig create mode 100644 drivers/dma/hsu/Makefile create mode 100644 drivers/dma/hsu/hsu.c create mode 100644 drivers/dma/hsu/hsu.h create mode 100644 drivers/dma/hsu/pci.c create mode 100644 include/linux/dma/hsu.h create mode 100644 include/linux/platform_data/dma-hsu.h diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index a874b6ec6650..074ffad334a7 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -125,6 +125,8 @@ config FSL_DMA EloPlus is on mpc85xx and mpc86xx and Pxxx parts, and the Elo3 is on some Txxx and Bxxx parts. +source "drivers/dma/hsu/Kconfig" + config MPC512X_DMA tristate "Freescale MPC512x built-in DMA engine support" depends on PPC_MPC512x || PPC_MPC831x diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index f915f61ec574..bf4485800c60 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_DMATEST) += dmatest.o obj-$(CONFIG_INTEL_IOATDMA) += ioat/ obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o obj-$(CONFIG_FSL_DMA) += fsldma.o +obj-$(CONFIG_HSU_DMA) += hsu/ obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/ obj-$(CONFIG_MV_XOR) += mv_xor.o diff --git a/drivers/dma/hsu/Kconfig b/drivers/dma/hsu/Kconfig new file mode 100644 index 000000000000..7e98eff7440e --- /dev/null +++ b/drivers/dma/hsu/Kconfig @@ -0,0 +1,14 @@ +# DMA engine configuration for hsu +config HSU_DMA + tristate "High Speed UART DMA support" + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + +config HSU_DMA_PCI + tristate "High Speed UART DMA PCI driver" + depends on PCI + select HSU_DMA + help + Support the High Speed UART DMA on the platfroms that + enumerate it as a PCI device. For example, Intel Medfield + has integrated this HSU DMA controller. diff --git a/drivers/dma/hsu/Makefile b/drivers/dma/hsu/Makefile new file mode 100644 index 000000000000..b8f9af032ef1 --- /dev/null +++ b/drivers/dma/hsu/Makefile @@ -0,0 +1,5 @@ +obj-$(CONFIG_HSU_DMA) += hsu_dma.o +hsu_dma-objs := hsu.o + +obj-$(CONFIG_HSU_DMA_PCI) += hsu_dma_pci.o +hsu_dma_pci-objs := pci.o diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c new file mode 100644 index 000000000000..683ba9b62795 --- /dev/null +++ b/drivers/dma/hsu/hsu.c @@ -0,0 +1,504 @@ +/* + * Core driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * Author: Andy Shevchenko + * + * Partially based on the bits found in drivers/tty/serial/mfd.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +/* + * DMA channel allocation: + * 1. Even number chans are used for DMA Read (UART TX), odd chans for DMA + * Write (UART RX). + * 2. 0/1 channel are assigned to port 0, 2/3 chan to port 1, 4/5 chan to + * port 3, and so on. + */ + +#include +#include +#include +#include +#include +#include + +#include "hsu.h" + +#define HSU_DMA_BUSWIDTHS \ + BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) | \ + BIT(DMA_SLAVE_BUSWIDTH_16_BYTES) + +static inline void hsu_chan_disable(struct hsu_dma_chan *hsuc) +{ + hsu_chan_writel(hsuc, HSU_CH_CR, 0); +} + +static inline void hsu_chan_enable(struct hsu_dma_chan *hsuc) +{ + u32 cr = HSU_CH_CR_CHA; + + if (hsuc->direction == DMA_MEM_TO_DEV) + cr &= ~HSU_CH_CR_CHD; + else if (hsuc->direction == DMA_DEV_TO_MEM) + cr |= HSU_CH_CR_CHD; + + hsu_chan_writel(hsuc, HSU_CH_CR, cr); +} + +static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc) +{ + struct dma_slave_config *config = &hsuc->config; + struct hsu_dma_desc *desc = hsuc->desc; + u32 bsr, mtsr; + u32 dcr = HSU_CH_DCR_CHSOE | HSU_CH_DCR_CHEI; + unsigned int i, count; + + if (hsuc->direction == DMA_MEM_TO_DEV) { + bsr = config->dst_maxburst; + mtsr = config->dst_addr_width; + } else if (hsuc->direction == DMA_DEV_TO_MEM) { + bsr = config->src_maxburst; + mtsr = config->src_addr_width; + } else { + /* Not supported direction */ + return; + } + + hsu_chan_disable(hsuc); + + hsu_chan_writel(hsuc, HSU_CH_DCR, 0); + hsu_chan_writel(hsuc, HSU_CH_BSR, bsr); + hsu_chan_writel(hsuc, HSU_CH_MTSR, mtsr); + + /* Set descriptors */ + count = (desc->nents - desc->active) % HSU_DMA_CHAN_NR_DESC; + for (i = 0; i < count; i++) { + hsu_chan_writel(hsuc, HSU_CH_DxSAR(i), desc->sg[i].addr); + hsu_chan_writel(hsuc, HSU_CH_DxTSR(i), desc->sg[i].len); + + /* Prepare value for DCR */ + dcr |= HSU_CH_DCR_DESCA(i); + dcr |= HSU_CH_DCR_CHTOI(i); /* timeout bit, see HSU Errata 1 */ + + desc->active++; + } + /* Only for the last descriptor in the chain */ + dcr |= HSU_CH_DCR_CHSOD(count - 1); + dcr |= HSU_CH_DCR_CHDI(count - 1); + + hsu_chan_writel(hsuc, HSU_CH_DCR, dcr); + + hsu_chan_enable(hsuc); +} + +static void hsu_dma_stop_channel(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_chan_disable(hsuc); + hsu_chan_writel(hsuc, HSU_CH_DCR, 0); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static void hsu_dma_start_channel(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_dma_chan_start(hsuc); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static void hsu_dma_start_transfer(struct hsu_dma_chan *hsuc) +{ + struct virt_dma_desc *vdesc; + + /* Get the next descriptor */ + vdesc = vchan_next_desc(&hsuc->vchan); + if (!vdesc) { + hsuc->desc = NULL; + return; + } + + list_del(&vdesc->node); + hsuc->desc = to_hsu_dma_desc(vdesc); + + /* Start the channel with a new descriptor */ + hsu_dma_start_channel(hsuc); +} + +static u32 hsu_dma_chan_get_sr(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + u32 sr; + + spin_lock_irqsave(&hsuc->lock, flags); + sr = hsu_chan_readl(hsuc, HSU_CH_SR); + spin_unlock_irqrestore(&hsuc->lock, flags); + + return sr; +} + +irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr) +{ + struct hsu_dma_chan *hsuc; + struct hsu_dma_desc *desc; + unsigned long flags; + u32 sr; + + /* Sanity check */ + if (nr >= chip->pdata->nr_channels) + return IRQ_NONE; + + hsuc = &chip->hsu->chan[nr]; + + /* + * No matter what situation, need read clear the IRQ status + * There is a bug, see Errata 5, HSD 2900918 + */ + sr = hsu_dma_chan_get_sr(hsuc); + if (!sr) + return IRQ_NONE; + + /* Timeout IRQ, need wait some time, see Errata 2 */ + if (hsuc->direction == DMA_DEV_TO_MEM && (sr & HSU_CH_SR_DESCTO_ANY)) + udelay(2); + + sr &= ~HSU_CH_SR_DESCTO_ANY; + if (!sr) + return IRQ_HANDLED; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + desc = hsuc->desc; + if (desc) { + if (sr & HSU_CH_SR_CHE) { + desc->status = DMA_ERROR; + } else if (desc->active < desc->nents) { + hsu_dma_start_channel(hsuc); + } else { + vchan_cookie_complete(&desc->vdesc); + desc->status = DMA_COMPLETE; + hsu_dma_start_transfer(hsuc); + } + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return IRQ_HANDLED; +} +EXPORT_SYMBOL_GPL(hsu_dma_irq); + +static struct hsu_dma_desc *hsu_dma_alloc_desc(unsigned int nents) +{ + struct hsu_dma_desc *desc; + + desc = kzalloc(sizeof(*desc), GFP_ATOMIC); + if (!desc) + return NULL; + + desc->sg = kcalloc(nents, sizeof(*desc->sg), GFP_ATOMIC); + if (!desc->sg) { + kfree(desc); + return NULL; + } + + return desc; +} + +static void hsu_dma_desc_free(struct virt_dma_desc *vdesc) +{ + struct hsu_dma_desc *desc = to_hsu_dma_desc(vdesc); + + kfree(desc->sg); + kfree(desc); +} + +static struct dma_async_tx_descriptor *hsu_dma_prep_slave_sg( + struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + struct hsu_dma_desc *desc; + struct scatterlist *sg; + unsigned int i; + + desc = hsu_dma_alloc_desc(sg_len); + if (!desc) + return NULL; + + for_each_sg(sgl, sg, sg_len, i) { + desc->sg[i].addr = sg_dma_address(sg); + desc->sg[i].len = sg_dma_len(sg); + } + + desc->nents = sg_len; + desc->direction = direction; + desc->active = 0; + desc->status = DMA_IN_PROGRESS; + + return vchan_tx_prep(&hsuc->vchan, &desc->vdesc, flags); +} + +static void hsu_dma_issue_pending(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + if (vchan_issue_pending(&hsuc->vchan) && !hsuc->desc) + hsu_dma_start_transfer(hsuc); + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); +} + +static size_t hsu_dma_desc_size(struct hsu_dma_desc *desc) +{ + size_t bytes = 0; + unsigned int i; + + for (i = desc->active; i < desc->nents; i++) + bytes += desc->sg[i].len; + + return bytes; +} + +static size_t hsu_dma_active_desc_size(struct hsu_dma_chan *hsuc) +{ + struct hsu_dma_desc *desc = hsuc->desc; + size_t bytes = hsu_dma_desc_size(desc); + int i; + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + i = desc->active % HSU_DMA_CHAN_NR_DESC; + do { + bytes += hsu_chan_readl(hsuc, HSU_CH_DxTSR(i)); + } while (--i >= 0); + spin_unlock_irqrestore(&hsuc->lock, flags); + + return bytes; +} + +static enum dma_status hsu_dma_tx_status(struct dma_chan *chan, + dma_cookie_t cookie, struct dma_tx_state *state) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + struct virt_dma_desc *vdesc; + enum dma_status status; + size_t bytes; + unsigned long flags; + + status = dma_cookie_status(chan, cookie, state); + if (status == DMA_COMPLETE) + return status; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + vdesc = vchan_find_desc(&hsuc->vchan, cookie); + if (hsuc->desc && cookie == hsuc->desc->vdesc.tx.cookie) { + bytes = hsu_dma_active_desc_size(hsuc); + dma_set_residue(state, bytes); + status = hsuc->desc->status; + } else if (vdesc) { + bytes = hsu_dma_desc_size(to_hsu_dma_desc(vdesc)); + dma_set_residue(state, bytes); + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return status; +} + +static int hsu_dma_slave_config(struct dma_chan *chan, + struct dma_slave_config *config) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + + /* Check if chan will be configured for slave transfers */ + if (!is_slave_direction(config->direction)) + return -EINVAL; + + memcpy(&hsuc->config, config, sizeof(hsuc->config)); + + return 0; +} + +static void hsu_dma_chan_deactivate(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_chan_disable(hsuc); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static void hsu_dma_chan_activate(struct hsu_dma_chan *hsuc) +{ + unsigned long flags; + + spin_lock_irqsave(&hsuc->lock, flags); + hsu_chan_enable(hsuc); + spin_unlock_irqrestore(&hsuc->lock, flags); +} + +static int hsu_dma_pause(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + if (hsuc->desc && hsuc->desc->status == DMA_IN_PROGRESS) { + hsu_dma_chan_deactivate(hsuc); + hsuc->desc->status = DMA_PAUSED; + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return 0; +} + +static int hsu_dma_resume(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + if (hsuc->desc && hsuc->desc->status == DMA_PAUSED) { + hsuc->desc->status = DMA_IN_PROGRESS; + hsu_dma_chan_activate(hsuc); + } + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + + return 0; +} + +static int hsu_dma_terminate_all(struct dma_chan *chan) +{ + struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&hsuc->vchan.lock, flags); + + hsu_dma_stop_channel(hsuc); + hsuc->desc = NULL; + + vchan_get_all_descriptors(&hsuc->vchan, &head); + spin_unlock_irqrestore(&hsuc->vchan.lock, flags); + vchan_dma_desc_free_list(&hsuc->vchan, &head); + + return 0; +} + +static int hsu_dma_alloc_chan_resources(struct dma_chan *chan) +{ + return 0; +} + +static void hsu_dma_free_chan_resources(struct dma_chan *chan) +{ + vchan_free_chan_resources(to_virt_chan(chan)); +} + +int hsu_dma_probe(struct hsu_dma_chip *chip) +{ + struct hsu_dma *hsu; + struct hsu_dma_platform_data *pdata = chip->pdata; + void __iomem *addr = chip->regs + chip->offset; + unsigned short i; + int ret; + + hsu = devm_kzalloc(chip->dev, sizeof(*hsu), GFP_KERNEL); + if (!hsu) + return -ENOMEM; + + chip->hsu = hsu; + + if (!pdata) { + pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + chip->pdata = pdata; + + /* Guess nr_channels from the IO space length */ + pdata->nr_channels = (chip->length - chip->offset) / + HSU_DMA_CHAN_LENGTH; + } + + hsu->chan = devm_kcalloc(chip->dev, pdata->nr_channels, + sizeof(*hsu->chan), GFP_KERNEL); + if (!hsu->chan) + return -ENOMEM; + + INIT_LIST_HEAD(&hsu->dma.channels); + for (i = 0; i < pdata->nr_channels; i++) { + struct hsu_dma_chan *hsuc = &hsu->chan[i]; + + hsuc->vchan.desc_free = hsu_dma_desc_free; + vchan_init(&hsuc->vchan, &hsu->dma); + + hsuc->direction = (i & 0x1) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV; + hsuc->reg = addr + i * HSU_DMA_CHAN_LENGTH; + + spin_lock_init(&hsuc->lock); + } + + dma_cap_set(DMA_SLAVE, hsu->dma.cap_mask); + dma_cap_set(DMA_PRIVATE, hsu->dma.cap_mask); + + hsu->dma.device_alloc_chan_resources = hsu_dma_alloc_chan_resources; + hsu->dma.device_free_chan_resources = hsu_dma_free_chan_resources; + + hsu->dma.device_prep_slave_sg = hsu_dma_prep_slave_sg; + + hsu->dma.device_issue_pending = hsu_dma_issue_pending; + hsu->dma.device_tx_status = hsu_dma_tx_status; + + hsu->dma.device_config = hsu_dma_slave_config; + hsu->dma.device_pause = hsu_dma_pause; + hsu->dma.device_resume = hsu_dma_resume; + hsu->dma.device_terminate_all = hsu_dma_terminate_all; + + hsu->dma.src_addr_widths = HSU_DMA_BUSWIDTHS; + hsu->dma.dst_addr_widths = HSU_DMA_BUSWIDTHS; + hsu->dma.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + hsu->dma.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + hsu->dma.dev = chip->dev; + + ret = dma_async_device_register(&hsu->dma); + if (ret) + return ret; + + dev_info(chip->dev, "Found HSU DMA, %d channels\n", pdata->nr_channels); + return 0; +} +EXPORT_SYMBOL_GPL(hsu_dma_probe); + +int hsu_dma_remove(struct hsu_dma_chip *chip) +{ + struct hsu_dma *hsu = chip->hsu; + unsigned short i; + + dma_async_device_unregister(&hsu->dma); + + for (i = 0; i < chip->pdata->nr_channels; i++) { + struct hsu_dma_chan *hsuc = &hsu->chan[i]; + + tasklet_kill(&hsuc->vchan.task); + } + + return 0; +} +EXPORT_SYMBOL_GPL(hsu_dma_remove); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("High Speed UART DMA core driver"); +MODULE_AUTHOR("Andy Shevchenko "); diff --git a/drivers/dma/hsu/hsu.h b/drivers/dma/hsu/hsu.h new file mode 100644 index 000000000000..0275233cf550 --- /dev/null +++ b/drivers/dma/hsu/hsu.h @@ -0,0 +1,118 @@ +/* + * Driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * + * Partially based on the bits found in drivers/tty/serial/mfd.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __DMA_HSU_H__ +#define __DMA_HSU_H__ + +#include +#include + +#include "../virt-dma.h" + +#define HSU_CH_SR 0x00 /* channel status */ +#define HSU_CH_CR 0x04 /* channel control */ +#define HSU_CH_DCR 0x08 /* descriptor control */ +#define HSU_CH_BSR 0x10 /* FIFO buffer size */ +#define HSU_CH_MTSR 0x14 /* minimum transfer size */ +#define HSU_CH_DxSAR(x) (0x20 + 8 * (x)) /* desc start addr */ +#define HSU_CH_DxTSR(x) (0x24 + 8 * (x)) /* desc transfer size */ +#define HSU_CH_D0SAR 0x20 /* desc 0 start addr */ +#define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */ +#define HSU_CH_D1SAR 0x28 +#define HSU_CH_D1TSR 0x2c +#define HSU_CH_D2SAR 0x30 +#define HSU_CH_D2TSR 0x34 +#define HSU_CH_D3SAR 0x38 +#define HSU_CH_D3TSR 0x3c + +#define HSU_DMA_CHAN_NR_DESC 4 +#define HSU_DMA_CHAN_LENGTH 0x40 + +/* Bits in HSU_CH_SR */ +#define HSU_CH_SR_DESCTO(x) BIT(8 + (x)) +#define HSU_CH_SR_DESCTO_ANY (BIT(11) | BIT(10) | BIT(9) | BIT(8)) +#define HSU_CH_SR_CHE BIT(15) + +/* Bits in HSU_CH_CR */ +#define HSU_CH_CR_CHA BIT(0) +#define HSU_CH_CR_CHD BIT(1) + +/* Bits in HSU_CH_DCR */ +#define HSU_CH_DCR_DESCA(x) BIT(0 + (x)) +#define HSU_CH_DCR_CHSOD(x) BIT(8 + (x)) +#define HSU_CH_DCR_CHSOTO BIT(14) +#define HSU_CH_DCR_CHSOE BIT(15) +#define HSU_CH_DCR_CHDI(x) BIT(16 + (x)) +#define HSU_CH_DCR_CHEI BIT(23) +#define HSU_CH_DCR_CHTOI(x) BIT(24 + (x)) + +struct hsu_dma_sg { + dma_addr_t addr; + unsigned int len; +}; + +struct hsu_dma_desc { + struct virt_dma_desc vdesc; + enum dma_transfer_direction direction; + struct hsu_dma_sg *sg; + unsigned int nents; + unsigned int active; + enum dma_status status; +}; + +static inline struct hsu_dma_desc *to_hsu_dma_desc(struct virt_dma_desc *vdesc) +{ + return container_of(vdesc, struct hsu_dma_desc, vdesc); +} + +struct hsu_dma_chan { + struct virt_dma_chan vchan; + + void __iomem *reg; + spinlock_t lock; + + /* hardware configuration */ + enum dma_transfer_direction direction; + struct dma_slave_config config; + + struct hsu_dma_desc *desc; +}; + +static inline struct hsu_dma_chan *to_hsu_dma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct hsu_dma_chan, vchan.chan); +} + +static inline u32 hsu_chan_readl(struct hsu_dma_chan *hsuc, int offset) +{ + return readl(hsuc->reg + offset); +} + +static inline void hsu_chan_writel(struct hsu_dma_chan *hsuc, int offset, + u32 value) +{ + writel(value, hsuc->reg + offset); +} + +struct hsu_dma { + struct dma_device dma; + + /* channels */ + struct hsu_dma_chan *chan; +}; + +static inline struct hsu_dma *to_hsu_dma(struct dma_device *ddev) +{ + return container_of(ddev, struct hsu_dma, dma); +} + +#endif /* __DMA_HSU_H__ */ diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c new file mode 100644 index 000000000000..563b4685d766 --- /dev/null +++ b/drivers/dma/hsu/pci.c @@ -0,0 +1,123 @@ +/* + * PCI driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * Author: Andy Shevchenko + * + * Partially based on the bits found in drivers/tty/serial/mfd.c. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include +#include +#include + +#include "hsu.h" + +#define HSU_PCI_DMASR 0x00 +#define HSU_PCI_DMAISR 0x04 + +#define HSU_PCI_CHAN_OFFSET 0x100 + +static irqreturn_t hsu_pci_irq(int irq, void *dev) +{ + struct hsu_dma_chip *chip = dev; + u32 dmaisr; + unsigned short i; + irqreturn_t ret = IRQ_NONE; + + dmaisr = readl(chip->regs + HSU_PCI_DMAISR); + for (i = 0; i < chip->pdata->nr_channels; i++) { + if (dmaisr & 0x1) + ret |= hsu_dma_irq(chip, i); + dmaisr >>= 1; + } + + return ret; +} + +static int hsu_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) +{ + struct hsu_dma_chip *chip; + int ret; + + ret = pcim_enable_device(pdev); + if (ret) + return ret; + + ret = pcim_iomap_regions(pdev, BIT(0), pci_name(pdev)); + if (ret) { + dev_err(&pdev->dev, "I/O memory remapping failed\n"); + return ret; + } + + pci_set_master(pdev); + pci_try_set_mwi(pdev); + + ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + ret = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32)); + if (ret) + return ret; + + chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); + if (!chip) + return -ENOMEM; + + chip->dev = &pdev->dev; + chip->regs = pcim_iomap_table(pdev)[0]; + chip->length = pci_resource_len(pdev, 0); + chip->offset = HSU_PCI_CHAN_OFFSET; + chip->irq = pdev->irq; + + pci_enable_msi(pdev); + + ret = hsu_dma_probe(chip); + if (ret) + return ret; + + ret = request_irq(chip->irq, hsu_pci_irq, 0, "hsu_dma_pci", chip); + if (ret) + goto err_register_irq; + + pci_set_drvdata(pdev, chip); + + return 0; + +err_register_irq: + hsu_dma_remove(chip); + return ret; +} + +static void hsu_pci_remove(struct pci_dev *pdev) +{ + struct hsu_dma_chip *chip = pci_get_drvdata(pdev); + + free_irq(chip->irq, chip); + hsu_dma_remove(chip); +} + +static const struct pci_device_id hsu_pci_id_table[] = { + { PCI_VDEVICE(INTEL, 0x081e), 0 }, + { } +}; +MODULE_DEVICE_TABLE(pci, hsu_pci_id_table); + +static struct pci_driver hsu_pci_driver = { + .name = "hsu_dma_pci", + .id_table = hsu_pci_id_table, + .probe = hsu_pci_probe, + .remove = hsu_pci_remove, +}; + +module_pci_driver(hsu_pci_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("High Speed UART DMA PCI driver"); +MODULE_AUTHOR("Andy Shevchenko "); diff --git a/include/linux/dma/hsu.h b/include/linux/dma/hsu.h new file mode 100644 index 000000000000..234393a6997b --- /dev/null +++ b/include/linux/dma/hsu.h @@ -0,0 +1,48 @@ +/* + * Driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _DMA_HSU_H +#define _DMA_HSU_H + +#include +#include + +#include + +struct hsu_dma; + +/** + * struct hsu_dma_chip - representation of HSU DMA hardware + * @dev: struct device of the DMA controller + * @irq: irq line + * @regs: memory mapped I/O space + * @length: I/O space length + * @offset: offset of the I/O space where registers are located + * @hsu: struct hsu_dma that is filed by ->probe() + * @pdata: platform data for the DMA controller if provided + */ +struct hsu_dma_chip { + struct device *dev; + int irq; + void __iomem *regs; + unsigned int length; + unsigned int offset; + struct hsu_dma *hsu; + struct hsu_dma_platform_data *pdata; +}; + +/* Export to the internal users */ +irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr); + +/* Export to the platform drivers */ +int hsu_dma_probe(struct hsu_dma_chip *chip); +int hsu_dma_remove(struct hsu_dma_chip *chip); + +#endif /* _DMA_HSU_H */ diff --git a/include/linux/platform_data/dma-hsu.h b/include/linux/platform_data/dma-hsu.h new file mode 100644 index 000000000000..8a1f6a4920b2 --- /dev/null +++ b/include/linux/platform_data/dma-hsu.h @@ -0,0 +1,25 @@ +/* + * Driver for the High Speed UART DMA + * + * Copyright (C) 2015 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _PLATFORM_DATA_DMA_HSU_H +#define _PLATFORM_DATA_DMA_HSU_H + +#include + +struct hsu_dma_slave { + struct device *dma_dev; + int chan_id; +}; + +struct hsu_dma_platform_data { + unsigned short nr_channels; +}; + +#endif /* _PLATFORM_DATA_DMA_HSU_H */ -- cgit From f549e94effa163ea170d2f0c12d307cb602431c6 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 23 Feb 2015 16:24:43 +0200 Subject: serial: 8250_pci: add Intel Penwell ports Intel Penwell supports 3 HSUART ports which are 8250 compatible. The patch adds necessary bits to the driver. The functions have intel_mid_* prefix due to more than one platform will use this code. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 183 +++++++++++++++++++++++++++++++++++++ 1 file changed, 183 insertions(+) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index fbe919410e0f..c03199e122ed 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -27,6 +27,7 @@ #include #include +#include #include "8250.h" @@ -1525,6 +1526,148 @@ byt_serial_setup(struct serial_private *priv, return ret; } +#define INTEL_MID_UART_PS 0x30 +#define INTEL_MID_UART_MUL 0x34 + +static void intel_mid_set_termios_50M(struct uart_port *p, + struct ktermios *termios, + struct ktermios *old) +{ + unsigned int baud = tty_termios_baud_rate(termios); + u32 ps, mul; + + /* + * The uart clk is 50Mhz, and the baud rate come from: + * baud = 50M * MUL / (DIV * PS * DLAB) + * + * For those basic low baud rate we can get the direct + * scalar from 2746800, like 115200 = 2746800/24. For those + * higher baud rate, we handle them case by case, mainly by + * adjusting the MUL/PS registers, and DIV register is kept + * as default value 0x3d09 to make things simple. + */ + + ps = 0x10; + + switch (baud) { + case 500000: + case 1000000: + case 1500000: + case 3000000: + mul = 0x3a98; + p->uartclk = 48000000; + break; + case 2000000: + case 4000000: + mul = 0x2710; + ps = 0x08; + p->uartclk = 64000000; + break; + case 2500000: + mul = 0x30d4; + p->uartclk = 40000000; + break; + case 3500000: + mul = 0x3345; + ps = 0x0c; + p->uartclk = 56000000; + break; + default: + mul = 0x2400; + p->uartclk = 29491200; + } + + writel(ps, p->membase + INTEL_MID_UART_PS); /* set PS */ + writel(mul, p->membase + INTEL_MID_UART_MUL); /* set MUL */ + + serial8250_do_set_termios(p, termios, old); +} + +static bool intel_mid_dma_filter(struct dma_chan *chan, void *param) +{ + struct hsu_dma_slave *s = param; + + if (s->dma_dev != chan->device->dev || s->chan_id != chan->chan_id) + return false; + + chan->private = s; + return true; +} + +static int intel_mid_serial_setup(struct serial_private *priv, + const struct pciserial_board *board, + struct uart_8250_port *port, int idx, + int index, struct pci_dev *dma_dev) +{ + struct device *dev = port->port.dev; + struct uart_8250_dma *dma; + struct hsu_dma_slave *tx_param, *rx_param; + + dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL); + if (!dma) + return -ENOMEM; + + tx_param = devm_kzalloc(dev, sizeof(*tx_param), GFP_KERNEL); + if (!tx_param) + return -ENOMEM; + + rx_param = devm_kzalloc(dev, sizeof(*rx_param), GFP_KERNEL); + if (!rx_param) + return -ENOMEM; + + rx_param->chan_id = index * 2 + 1; + tx_param->chan_id = index * 2; + + dma->rxconf.src_maxburst = 64; + dma->txconf.dst_maxburst = 64; + + rx_param->dma_dev = &dma_dev->dev; + tx_param->dma_dev = &dma_dev->dev; + + dma->fn = intel_mid_dma_filter; + dma->rx_param = rx_param; + dma->tx_param = tx_param; + + port->port.type = PORT_16750; + port->port.flags |= UPF_FIXED_PORT | UPF_FIXED_TYPE; + port->dma = dma; + + return pci_default_setup(priv, board, port, idx); +} + +#define PCI_DEVICE_ID_INTEL_PNW_UART1 0x081b +#define PCI_DEVICE_ID_INTEL_PNW_UART2 0x081c +#define PCI_DEVICE_ID_INTEL_PNW_UART3 0x081d + +static int pnw_serial_setup(struct serial_private *priv, + const struct pciserial_board *board, + struct uart_8250_port *port, int idx) +{ + struct pci_dev *pdev = priv->dev; + struct pci_dev *dma_dev; + int index; + + switch (pdev->device) { + case PCI_DEVICE_ID_INTEL_PNW_UART1: + index = 0; + break; + case PCI_DEVICE_ID_INTEL_PNW_UART2: + index = 1; + break; + case PCI_DEVICE_ID_INTEL_PNW_UART3: + index = 2; + break; + default: + return -EINVAL; + } + + dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 3)); + + port->port.set_termios = intel_mid_set_termios_50M; + + return intel_mid_serial_setup(priv, board, port, idx, index, dma_dev); +} + static int pci_omegapci_setup(struct serial_private *priv, const struct pciserial_board *board, @@ -1987,6 +2130,27 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { .subdevice = PCI_ANY_ID, .setup = byt_serial_setup, }, + { + .vendor = PCI_VENDOR_ID_INTEL, + .device = PCI_DEVICE_ID_INTEL_PNW_UART1, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .setup = pnw_serial_setup, + }, + { + .vendor = PCI_VENDOR_ID_INTEL, + .device = PCI_DEVICE_ID_INTEL_PNW_UART2, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .setup = pnw_serial_setup, + }, + { + .vendor = PCI_VENDOR_ID_INTEL, + .device = PCI_DEVICE_ID_INTEL_PNW_UART3, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .setup = pnw_serial_setup, + }, { .vendor = PCI_VENDOR_ID_INTEL, .device = PCI_DEVICE_ID_INTEL_QRK_UART, @@ -2878,6 +3042,7 @@ enum pci_board_num_t { pbn_ADDIDATA_PCIe_8_3906250, pbn_ce4100_1_115200, pbn_byt, + pbn_pnw, pbn_qrk, pbn_omegapci, pbn_NETMOS9900_2s_115200, @@ -3644,6 +3809,11 @@ static struct pciserial_board pci_boards[] = { .uart_offset = 0x80, .reg_shift = 2, }, + [pbn_pnw] = { + .flags = FL_BASE0, + .num_ports = 1, + .base_baud = 115200, + }, [pbn_qrk] = { .flags = FL_BASE0, .num_ports = 1, @@ -5376,6 +5546,19 @@ static struct pci_device_id serial_pci_tbl[] = { PCI_CLASS_COMMUNICATION_SERIAL << 8, 0xff0000, pbn_byt }, + /* + * Intel Penwell + */ + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PNW_UART1, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, + pbn_pnw}, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PNW_UART2, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, + pbn_pnw}, + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PNW_UART3, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, + pbn_pnw}, + /* * Intel Quark x1000 */ -- cgit From 1bd187de536494a27925902b9653e9ef0ace4774 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 23 Feb 2015 16:24:44 +0200 Subject: x86, intel-mid: remove Intel MID specific serial support Since we have a native 8250 driver carrying the Intel MID serial devices the specific support is not needed anymore. This patch removes it for Intel MID. Note that the console device name is changed from ttyMFDx to ttySx. Signed-off-by: Andy Shevchenko Acked-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- arch/x86/Kconfig.debug | 4 - arch/x86/include/asm/intel-mid.h | 3 - arch/x86/kernel/early_printk.c | 6 - arch/x86/platform/intel-mid/Makefile | 1 - .../platform/intel-mid/early_printk_intel_mid.c | 112 -- drivers/tty/serial/Kconfig | 10 - drivers/tty/serial/Makefile | 1 - drivers/tty/serial/mfd.c | 1505 -------------------- include/linux/serial_mfd.h | 47 - include/uapi/linux/serial_reg.h | 19 - 10 files changed, 1708 deletions(-) delete mode 100644 arch/x86/platform/intel-mid/early_printk_intel_mid.c delete mode 100644 drivers/tty/serial/mfd.c delete mode 100644 include/linux/serial_mfd.h diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 20028da8ae18..72484a645f05 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -43,10 +43,6 @@ config EARLY_PRINTK with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash. -config EARLY_PRINTK_INTEL_MID - bool "Early printk for Intel MID platform support" - depends on EARLY_PRINTK && X86_INTEL_MID - config EARLY_PRINTK_DBGP bool "Early printk via EHCI debug port" depends on EARLY_PRINTK && PCI diff --git a/arch/x86/include/asm/intel-mid.h b/arch/x86/include/asm/intel-mid.h index 705d35708a50..7c5af123bdbd 100644 --- a/arch/x86/include/asm/intel-mid.h +++ b/arch/x86/include/asm/intel-mid.h @@ -136,9 +136,6 @@ extern enum intel_mid_timer_options intel_mid_timer_options; #define SFI_MTMR_MAX_NUM 8 #define SFI_MRTC_MAX 8 -extern struct console early_hsu_console; -extern void hsu_early_console_init(const char *); - extern void intel_scu_devices_create(void); extern void intel_scu_devices_destroy(void); diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c index a62536a1be88..f85e3fb50f28 100644 --- a/arch/x86/kernel/early_printk.c +++ b/arch/x86/kernel/early_printk.c @@ -375,12 +375,6 @@ static int __init setup_early_printk(char *buf) if (!strncmp(buf, "xen", 3)) early_console_register(&xenboot_console, keep); #endif -#ifdef CONFIG_EARLY_PRINTK_INTEL_MID - if (!strncmp(buf, "hsu", 3)) { - hsu_early_console_init(buf + 3); - early_console_register(&early_hsu_console, keep); - } -#endif #ifdef CONFIG_EARLY_PRINTK_EFI if (!strncmp(buf, "efi", 3)) early_console_register(&early_efi_console, keep); diff --git a/arch/x86/platform/intel-mid/Makefile b/arch/x86/platform/intel-mid/Makefile index 0a8ee703b9fa..0ce1b1913673 100644 --- a/arch/x86/platform/intel-mid/Makefile +++ b/arch/x86/platform/intel-mid/Makefile @@ -1,5 +1,4 @@ obj-$(CONFIG_X86_INTEL_MID) += intel-mid.o intel_mid_vrtc.o mfld.o mrfl.o -obj-$(CONFIG_EARLY_PRINTK_INTEL_MID) += early_printk_intel_mid.o # SFI specific code ifdef CONFIG_X86_INTEL_MID diff --git a/arch/x86/platform/intel-mid/early_printk_intel_mid.c b/arch/x86/platform/intel-mid/early_printk_intel_mid.c deleted file mode 100644 index 4e720829ab90..000000000000 --- a/arch/x86/platform/intel-mid/early_printk_intel_mid.c +++ /dev/null @@ -1,112 +0,0 @@ -/* - * early_printk_intel_mid.c - early consoles for Intel MID platforms - * - * Copyright (c) 2008-2010, Intel Corporation - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; version 2 - * of the License. - */ - -/* - * This file implements early console named hsu. - * hsu is based on a High Speed UART device which only exists in the Medfield - * platform - */ - -#include -#include -#include -#include -#include -#include - -#include -#include -#include - -/* - * Following is the early console based on Medfield HSU (High - * Speed UART) device. - */ -#define HSU_PORT_BASE 0xffa28080 - -static void __iomem *phsu; - -void hsu_early_console_init(const char *s) -{ - unsigned long paddr, port = 0; - u8 lcr; - - /* - * Select the early HSU console port if specified by user in the - * kernel command line. - */ - if (*s && !kstrtoul(s, 10, &port)) - port = clamp_val(port, 0, 2); - - paddr = HSU_PORT_BASE + port * 0x80; - phsu = (void __iomem *)set_fixmap_offset_nocache(FIX_EARLYCON_MEM_BASE, paddr); - - /* Disable FIFO */ - writeb(0x0, phsu + UART_FCR); - - /* Set to default 115200 bps, 8n1 */ - lcr = readb(phsu + UART_LCR); - writeb((0x80 | lcr), phsu + UART_LCR); - writeb(0x18, phsu + UART_DLL); - writeb(lcr, phsu + UART_LCR); - writel(0x3600, phsu + UART_MUL*4); - - writeb(0x8, phsu + UART_MCR); - writeb(0x7, phsu + UART_FCR); - writeb(0x3, phsu + UART_LCR); - - /* Clear IRQ status */ - readb(phsu + UART_LSR); - readb(phsu + UART_RX); - readb(phsu + UART_IIR); - readb(phsu + UART_MSR); - - /* Enable FIFO */ - writeb(0x7, phsu + UART_FCR); -} - -#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) - -static void early_hsu_putc(char ch) -{ - unsigned int timeout = 10000; /* 10ms */ - u8 status; - - while (--timeout) { - status = readb(phsu + UART_LSR); - if (status & BOTH_EMPTY) - break; - udelay(1); - } - - /* Only write the char when there was no timeout */ - if (timeout) - writeb(ch, phsu + UART_TX); -} - -static void early_hsu_write(struct console *con, const char *str, unsigned n) -{ - int i; - - for (i = 0; i < n && *str; i++) { - if (*str == '\n') - early_hsu_putc('\r'); - early_hsu_putc(*str); - str++; - } -} - -struct console early_hsu_console = { - .name = "earlyhsu", - .write = early_hsu_write, - .flags = CON_PRINTBUFFER, - .index = -1, -}; diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 60c368a5dbf1..c9dbc626038d 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -483,16 +483,6 @@ config SERIAL_SA1100_CONSOLE your boot loader (lilo or loadlin) about how to pass options to the kernel at boot time.) -config SERIAL_MFD_HSU - tristate "Medfield High Speed UART support" - depends on PCI - select SERIAL_CORE - -config SERIAL_MFD_HSU_CONSOLE - bool "Medfield HSU serial console support" - depends on SERIAL_MFD_HSU=y - select SERIAL_CORE_CONSOLE - config SERIAL_BFIN tristate "Blackfin serial port support" depends on BLACKFIN diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 599be4b05a26..f42b4f9845df 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -78,7 +78,6 @@ obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o -obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o obj-$(CONFIG_SERIAL_IFX6X60) += ifx6x60.o obj-$(CONFIG_SERIAL_PCH_UART) += pch_uart.o obj-$(CONFIG_SERIAL_MSM_SMD) += msm_smd_tty.o diff --git a/drivers/tty/serial/mfd.c b/drivers/tty/serial/mfd.c deleted file mode 100644 index 8fe4501d7565..000000000000 --- a/drivers/tty/serial/mfd.c +++ /dev/null @@ -1,1505 +0,0 @@ -/* - * mfd.c: driver for High Speed UART device of Intel Medfield platform - * - * Refer pxa.c, 8250.c and some other drivers in drivers/serial/ - * - * (C) Copyright 2010 Intel Corporation - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; version 2 - * of the License. - */ - -/* Notes: - * 1. DMA channel allocation: 0/1 channel are assigned to port 0, - * 2/3 chan to port 1, 4/5 chan to port 3. Even number chans - * are used for RX, odd chans for TX - * - * 2. The RI/DSR/DCD/DTR are not pinned out, DCD & DSR are always - * asserted, only when the HW is reset the DDCD and DDSR will - * be triggered - */ - -#if defined(CONFIG_SERIAL_MFD_HSU_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -#define SUPPORT_SYSRQ -#endif - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#define HSU_DMA_BUF_SIZE 2048 - -#define chan_readl(chan, offset) readl(chan->reg + offset) -#define chan_writel(chan, offset, val) writel(val, chan->reg + offset) - -#define mfd_readl(obj, offset) readl(obj->reg + offset) -#define mfd_writel(obj, offset, val) writel(val, obj->reg + offset) - -static int hsu_dma_enable; -module_param(hsu_dma_enable, int, 0); -MODULE_PARM_DESC(hsu_dma_enable, - "It is a bitmap to set working mode, if bit[x] is 1, then port[x] will work in DMA mode, otherwise in PIO mode."); - -struct hsu_dma_buffer { - u8 *buf; - dma_addr_t dma_addr; - u32 dma_size; - u32 ofs; -}; - -struct hsu_dma_chan { - u32 id; - enum dma_data_direction dirt; - struct uart_hsu_port *uport; - void __iomem *reg; -}; - -struct uart_hsu_port { - struct uart_port port; - unsigned char ier; - unsigned char lcr; - unsigned char mcr; - unsigned int lsr_break_flag; - char name[12]; - int index; - struct device *dev; - - struct hsu_dma_chan *txc; - struct hsu_dma_chan *rxc; - struct hsu_dma_buffer txbuf; - struct hsu_dma_buffer rxbuf; - int use_dma; /* flag for DMA/PIO */ - int running; - int dma_tx_on; -}; - -/* Top level data structure of HSU */ -struct hsu_port { - void __iomem *reg; - unsigned long paddr; - unsigned long iolen; - u32 irq; - - struct uart_hsu_port port[3]; - struct hsu_dma_chan chans[10]; - - struct dentry *debugfs; -}; - -static inline unsigned int serial_in(struct uart_hsu_port *up, int offset) -{ - unsigned int val; - - if (offset > UART_MSR) { - offset <<= 2; - val = readl(up->port.membase + offset); - } else - val = (unsigned int)readb(up->port.membase + offset); - - return val; -} - -static inline void serial_out(struct uart_hsu_port *up, int offset, int value) -{ - if (offset > UART_MSR) { - offset <<= 2; - writel(value, up->port.membase + offset); - } else { - unsigned char val = value & 0xff; - writeb(val, up->port.membase + offset); - } -} - -#ifdef CONFIG_DEBUG_FS - -#define HSU_REGS_BUFSIZE 1024 - - -static ssize_t port_show_regs(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct uart_hsu_port *up = file->private_data; - char *buf; - u32 len = 0; - ssize_t ret; - - buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL); - if (!buf) - return 0; - - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "MFD HSU port[%d] regs:\n", up->index); - - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "=================================\n"); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "IER: \t\t0x%08x\n", serial_in(up, UART_IER)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "IIR: \t\t0x%08x\n", serial_in(up, UART_IIR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "LCR: \t\t0x%08x\n", serial_in(up, UART_LCR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "MCR: \t\t0x%08x\n", serial_in(up, UART_MCR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "LSR: \t\t0x%08x\n", serial_in(up, UART_LSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "MSR: \t\t0x%08x\n", serial_in(up, UART_MSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "FOR: \t\t0x%08x\n", serial_in(up, UART_FOR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "PS: \t\t0x%08x\n", serial_in(up, UART_PS)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "MUL: \t\t0x%08x\n", serial_in(up, UART_MUL)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "DIV: \t\t0x%08x\n", serial_in(up, UART_DIV)); - - if (len > HSU_REGS_BUFSIZE) - len = HSU_REGS_BUFSIZE; - - ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); - kfree(buf); - return ret; -} - -static ssize_t dma_show_regs(struct file *file, char __user *user_buf, - size_t count, loff_t *ppos) -{ - struct hsu_dma_chan *chan = file->private_data; - char *buf; - u32 len = 0; - ssize_t ret; - - buf = kzalloc(HSU_REGS_BUFSIZE, GFP_KERNEL); - if (!buf) - return 0; - - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "MFD HSU DMA channel [%d] regs:\n", chan->id); - - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "=================================\n"); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "CR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_CR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "DCR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_DCR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "BSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_BSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "MOTSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_MOTSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0SAR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D0TSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1SAR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D1TSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2SAR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D2TSR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0SAR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3SAR)); - len += snprintf(buf + len, HSU_REGS_BUFSIZE - len, - "D0TSR: \t\t0x%08x\n", chan_readl(chan, HSU_CH_D3TSR)); - - if (len > HSU_REGS_BUFSIZE) - len = HSU_REGS_BUFSIZE; - - ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); - kfree(buf); - return ret; -} - -static const struct file_operations port_regs_ops = { - .owner = THIS_MODULE, - .open = simple_open, - .read = port_show_regs, - .llseek = default_llseek, -}; - -static const struct file_operations dma_regs_ops = { - .owner = THIS_MODULE, - .open = simple_open, - .read = dma_show_regs, - .llseek = default_llseek, -}; - -static int hsu_debugfs_init(struct hsu_port *hsu) -{ - int i; - char name[32]; - - hsu->debugfs = debugfs_create_dir("hsu", NULL); - if (!hsu->debugfs) - return -ENOMEM; - - for (i = 0; i < 3; i++) { - snprintf(name, sizeof(name), "port_%d_regs", i); - debugfs_create_file(name, S_IFREG | S_IRUGO, - hsu->debugfs, (void *)(&hsu->port[i]), &port_regs_ops); - } - - for (i = 0; i < 6; i++) { - snprintf(name, sizeof(name), "dma_chan_%d_regs", i); - debugfs_create_file(name, S_IFREG | S_IRUGO, - hsu->debugfs, (void *)&hsu->chans[i], &dma_regs_ops); - } - - return 0; -} - -static void hsu_debugfs_remove(struct hsu_port *hsu) -{ - if (hsu->debugfs) - debugfs_remove_recursive(hsu->debugfs); -} - -#else -static inline int hsu_debugfs_init(struct hsu_port *hsu) -{ - return 0; -} - -static inline void hsu_debugfs_remove(struct hsu_port *hsu) -{ -} -#endif /* CONFIG_DEBUG_FS */ - -static void serial_hsu_enable_ms(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - - up->ier |= UART_IER_MSI; - serial_out(up, UART_IER, up->ier); -} - -static void hsu_dma_tx(struct uart_hsu_port *up) -{ - struct circ_buf *xmit = &up->port.state->xmit; - struct hsu_dma_buffer *dbuf = &up->txbuf; - int count; - - /* test_and_set_bit may be better, but anyway it's in lock protected mode */ - if (up->dma_tx_on) - return; - - /* Update the circ buf info */ - xmit->tail += dbuf->ofs; - xmit->tail &= UART_XMIT_SIZE - 1; - - up->port.icount.tx += dbuf->ofs; - dbuf->ofs = 0; - - /* Disable the channel */ - chan_writel(up->txc, HSU_CH_CR, 0x0); - - if (!uart_circ_empty(xmit) && !uart_tx_stopped(&up->port)) { - dma_sync_single_for_device(up->port.dev, - dbuf->dma_addr, - dbuf->dma_size, - DMA_TO_DEVICE); - - count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE); - dbuf->ofs = count; - - /* Reprogram the channel */ - chan_writel(up->txc, HSU_CH_D0SAR, dbuf->dma_addr + xmit->tail); - chan_writel(up->txc, HSU_CH_D0TSR, count); - - /* Reenable the channel */ - chan_writel(up->txc, HSU_CH_DCR, 0x1 - | (0x1 << 8) - | (0x1 << 16) - | (0x1 << 24)); - up->dma_tx_on = 1; - chan_writel(up->txc, HSU_CH_CR, 0x1); - } - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&up->port); -} - -/* The buffer is already cache coherent */ -static void hsu_dma_start_rx_chan(struct hsu_dma_chan *rxc, - struct hsu_dma_buffer *dbuf) -{ - dbuf->ofs = 0; - - chan_writel(rxc, HSU_CH_BSR, 32); - chan_writel(rxc, HSU_CH_MOTSR, 4); - - chan_writel(rxc, HSU_CH_D0SAR, dbuf->dma_addr); - chan_writel(rxc, HSU_CH_D0TSR, dbuf->dma_size); - chan_writel(rxc, HSU_CH_DCR, 0x1 | (0x1 << 8) - | (0x1 << 16) - | (0x1 << 24) /* timeout bit, see HSU Errata 1 */ - ); - chan_writel(rxc, HSU_CH_CR, 0x3); -} - -/* Protected by spin_lock_irqsave(port->lock) */ -static void serial_hsu_start_tx(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - - if (up->use_dma) { - hsu_dma_tx(up); - } else if (!(up->ier & UART_IER_THRI)) { - up->ier |= UART_IER_THRI; - serial_out(up, UART_IER, up->ier); - } -} - -static void serial_hsu_stop_tx(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - struct hsu_dma_chan *txc = up->txc; - - if (up->use_dma) - chan_writel(txc, HSU_CH_CR, 0x0); - else if (up->ier & UART_IER_THRI) { - up->ier &= ~UART_IER_THRI; - serial_out(up, UART_IER, up->ier); - } -} - -/* This is always called in spinlock protected mode, so - * modify timeout timer is safe here */ -static void hsu_dma_rx(struct uart_hsu_port *up, u32 int_sts, - unsigned long *flags) -{ - struct hsu_dma_buffer *dbuf = &up->rxbuf; - struct hsu_dma_chan *chan = up->rxc; - struct uart_port *port = &up->port; - struct tty_port *tport = &port->state->port; - int count; - - /* - * First need to know how many is already transferred, - * then check if its a timeout DMA irq, and return - * the trail bytes out, push them up and reenable the - * channel - */ - - /* Timeout IRQ, need wait some time, see Errata 2 */ - if (int_sts & 0xf00) - udelay(2); - - /* Stop the channel */ - chan_writel(chan, HSU_CH_CR, 0x0); - - count = chan_readl(chan, HSU_CH_D0SAR) - dbuf->dma_addr; - if (!count) { - /* Restart the channel before we leave */ - chan_writel(chan, HSU_CH_CR, 0x3); - return; - } - - dma_sync_single_for_cpu(port->dev, dbuf->dma_addr, - dbuf->dma_size, DMA_FROM_DEVICE); - - /* - * Head will only wrap around when we recycle - * the DMA buffer, and when that happens, we - * explicitly set tail to 0. So head will - * always be greater than tail. - */ - tty_insert_flip_string(tport, dbuf->buf, count); - port->icount.rx += count; - - dma_sync_single_for_device(up->port.dev, dbuf->dma_addr, - dbuf->dma_size, DMA_FROM_DEVICE); - - /* Reprogram the channel */ - chan_writel(chan, HSU_CH_D0SAR, dbuf->dma_addr); - chan_writel(chan, HSU_CH_D0TSR, dbuf->dma_size); - chan_writel(chan, HSU_CH_DCR, 0x1 - | (0x1 << 8) - | (0x1 << 16) - | (0x1 << 24) /* timeout bit, see HSU Errata 1 */ - ); - spin_unlock_irqrestore(&up->port.lock, *flags); - tty_flip_buffer_push(tport); - spin_lock_irqsave(&up->port.lock, *flags); - - chan_writel(chan, HSU_CH_CR, 0x3); - -} - -static void serial_hsu_stop_rx(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - struct hsu_dma_chan *chan = up->rxc; - - if (up->use_dma) - chan_writel(chan, HSU_CH_CR, 0x2); - else { - up->ier &= ~UART_IER_RLSI; - up->port.read_status_mask &= ~UART_LSR_DR; - serial_out(up, UART_IER, up->ier); - } -} - -static inline void receive_chars(struct uart_hsu_port *up, int *status, - unsigned long *flags) -{ - unsigned int ch, flag; - unsigned int max_count = 256; - - do { - ch = serial_in(up, UART_RX); - flag = TTY_NORMAL; - up->port.icount.rx++; - - if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE | - UART_LSR_FE | UART_LSR_OE))) { - - dev_warn(up->dev, "We really rush into ERR/BI case" - "status = 0x%02x", *status); - /* For statistics only */ - if (*status & UART_LSR_BI) { - *status &= ~(UART_LSR_FE | UART_LSR_PE); - up->port.icount.brk++; - /* - * We do the SysRQ and SAK checking - * here because otherwise the break - * may get masked by ignore_status_mask - * or read_status_mask. - */ - if (uart_handle_break(&up->port)) - goto ignore_char; - } else if (*status & UART_LSR_PE) - up->port.icount.parity++; - else if (*status & UART_LSR_FE) - up->port.icount.frame++; - if (*status & UART_LSR_OE) - up->port.icount.overrun++; - - /* Mask off conditions which should be ignored. */ - *status &= up->port.read_status_mask; - -#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE - if (up->port.cons && - up->port.cons->index == up->port.line) { - /* Recover the break flag from console xmit */ - *status |= up->lsr_break_flag; - up->lsr_break_flag = 0; - } -#endif - if (*status & UART_LSR_BI) { - flag = TTY_BREAK; - } else if (*status & UART_LSR_PE) - flag = TTY_PARITY; - else if (*status & UART_LSR_FE) - flag = TTY_FRAME; - } - - if (uart_handle_sysrq_char(&up->port, ch)) - goto ignore_char; - - uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag); - ignore_char: - *status = serial_in(up, UART_LSR); - } while ((*status & UART_LSR_DR) && max_count--); - - spin_unlock_irqrestore(&up->port.lock, *flags); - tty_flip_buffer_push(&up->port.state->port); - spin_lock_irqsave(&up->port.lock, *flags); -} - -static void transmit_chars(struct uart_hsu_port *up) -{ - struct circ_buf *xmit = &up->port.state->xmit; - int count; - - if (up->port.x_char) { - serial_out(up, UART_TX, up->port.x_char); - up->port.icount.tx++; - up->port.x_char = 0; - return; - } - if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) { - serial_hsu_stop_tx(&up->port); - return; - } - - /* The IRQ is for TX FIFO half-empty */ - count = up->port.fifosize / 2; - - do { - serial_out(up, UART_TX, xmit->buf[xmit->tail]); - xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - - up->port.icount.tx++; - if (uart_circ_empty(xmit)) - break; - } while (--count > 0); - - if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) - uart_write_wakeup(&up->port); - - if (uart_circ_empty(xmit)) - serial_hsu_stop_tx(&up->port); -} - -static inline void check_modem_status(struct uart_hsu_port *up) -{ - int status; - - status = serial_in(up, UART_MSR); - - if ((status & UART_MSR_ANY_DELTA) == 0) - return; - - if (status & UART_MSR_TERI) - up->port.icount.rng++; - if (status & UART_MSR_DDSR) - up->port.icount.dsr++; - /* We may only get DDCD when HW init and reset */ - if (status & UART_MSR_DDCD) - uart_handle_dcd_change(&up->port, status & UART_MSR_DCD); - /* Will start/stop_tx accordingly */ - if (status & UART_MSR_DCTS) - uart_handle_cts_change(&up->port, status & UART_MSR_CTS); - - wake_up_interruptible(&up->port.state->port.delta_msr_wait); -} - -/* - * This handles the interrupt from one port. - */ -static irqreturn_t port_irq(int irq, void *dev_id) -{ - struct uart_hsu_port *up = dev_id; - unsigned int iir, lsr; - unsigned long flags; - - if (unlikely(!up->running)) - return IRQ_NONE; - - spin_lock_irqsave(&up->port.lock, flags); - if (up->use_dma) { - lsr = serial_in(up, UART_LSR); - if (unlikely(lsr & (UART_LSR_BI | UART_LSR_PE | - UART_LSR_FE | UART_LSR_OE))) - dev_warn(up->dev, - "Got lsr irq while using DMA, lsr = 0x%2x\n", - lsr); - check_modem_status(up); - spin_unlock_irqrestore(&up->port.lock, flags); - return IRQ_HANDLED; - } - - iir = serial_in(up, UART_IIR); - if (iir & UART_IIR_NO_INT) { - spin_unlock_irqrestore(&up->port.lock, flags); - return IRQ_NONE; - } - - lsr = serial_in(up, UART_LSR); - if (lsr & UART_LSR_DR) - receive_chars(up, &lsr, &flags); - check_modem_status(up); - - /* lsr will be renewed during the receive_chars */ - if (lsr & UART_LSR_THRE) - transmit_chars(up); - - spin_unlock_irqrestore(&up->port.lock, flags); - return IRQ_HANDLED; -} - -static inline void dma_chan_irq(struct hsu_dma_chan *chan) -{ - struct uart_hsu_port *up = chan->uport; - unsigned long flags; - u32 int_sts; - - spin_lock_irqsave(&up->port.lock, flags); - - if (!up->use_dma || !up->running) - goto exit; - - /* - * No matter what situation, need read clear the IRQ status - * There is a bug, see Errata 5, HSD 2900918 - */ - int_sts = chan_readl(chan, HSU_CH_SR); - - /* Rx channel */ - if (chan->dirt == DMA_FROM_DEVICE) - hsu_dma_rx(up, int_sts, &flags); - - /* Tx channel */ - if (chan->dirt == DMA_TO_DEVICE) { - chan_writel(chan, HSU_CH_CR, 0x0); - up->dma_tx_on = 0; - hsu_dma_tx(up); - } - -exit: - spin_unlock_irqrestore(&up->port.lock, flags); - return; -} - -static irqreturn_t dma_irq(int irq, void *dev_id) -{ - struct hsu_port *hsu = dev_id; - u32 int_sts, i; - - int_sts = mfd_readl(hsu, HSU_GBL_DMAISR); - - /* Currently we only have 6 channels may be used */ - for (i = 0; i < 6; i++) { - if (int_sts & 0x1) - dma_chan_irq(&hsu->chans[i]); - int_sts >>= 1; - } - - return IRQ_HANDLED; -} - -static unsigned int serial_hsu_tx_empty(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned long flags; - unsigned int ret; - - spin_lock_irqsave(&up->port.lock, flags); - ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0; - spin_unlock_irqrestore(&up->port.lock, flags); - - return ret; -} - -static unsigned int serial_hsu_get_mctrl(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned char status; - unsigned int ret; - - status = serial_in(up, UART_MSR); - - ret = 0; - if (status & UART_MSR_DCD) - ret |= TIOCM_CAR; - if (status & UART_MSR_RI) - ret |= TIOCM_RNG; - if (status & UART_MSR_DSR) - ret |= TIOCM_DSR; - if (status & UART_MSR_CTS) - ret |= TIOCM_CTS; - return ret; -} - -static void serial_hsu_set_mctrl(struct uart_port *port, unsigned int mctrl) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned char mcr = 0; - - if (mctrl & TIOCM_RTS) - mcr |= UART_MCR_RTS; - if (mctrl & TIOCM_DTR) - mcr |= UART_MCR_DTR; - if (mctrl & TIOCM_OUT1) - mcr |= UART_MCR_OUT1; - if (mctrl & TIOCM_OUT2) - mcr |= UART_MCR_OUT2; - if (mctrl & TIOCM_LOOP) - mcr |= UART_MCR_LOOP; - - mcr |= up->mcr; - - serial_out(up, UART_MCR, mcr); -} - -static void serial_hsu_break_ctl(struct uart_port *port, int break_state) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned long flags; - - spin_lock_irqsave(&up->port.lock, flags); - if (break_state == -1) - up->lcr |= UART_LCR_SBC; - else - up->lcr &= ~UART_LCR_SBC; - serial_out(up, UART_LCR, up->lcr); - spin_unlock_irqrestore(&up->port.lock, flags); -} - -/* - * What special to do: - * 1. chose the 64B fifo mode - * 2. start dma or pio depends on configuration - * 3. we only allocate dma memory when needed - */ -static int serial_hsu_startup(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned long flags; - - pm_runtime_get_sync(up->dev); - - /* - * Clear the FIFO buffers and disable them. - * (they will be reenabled in set_termios()) - */ - serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO); - serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | - UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT); - serial_out(up, UART_FCR, 0); - - /* Clear the interrupt registers. */ - (void) serial_in(up, UART_LSR); - (void) serial_in(up, UART_RX); - (void) serial_in(up, UART_IIR); - (void) serial_in(up, UART_MSR); - - /* Now, initialize the UART, default is 8n1 */ - serial_out(up, UART_LCR, UART_LCR_WLEN8); - - spin_lock_irqsave(&up->port.lock, flags); - - up->port.mctrl |= TIOCM_OUT2; - serial_hsu_set_mctrl(&up->port, up->port.mctrl); - - /* - * Finally, enable interrupts. Note: Modem status interrupts - * are set via set_termios(), which will be occurring imminently - * anyway, so we don't enable them here. - */ - if (!up->use_dma) - up->ier = UART_IER_RLSI | UART_IER_RDI | UART_IER_RTOIE; - else - up->ier = 0; - serial_out(up, UART_IER, up->ier); - - spin_unlock_irqrestore(&up->port.lock, flags); - - /* DMA init */ - if (up->use_dma) { - struct hsu_dma_buffer *dbuf; - struct circ_buf *xmit = &port->state->xmit; - - up->dma_tx_on = 0; - - /* First allocate the RX buffer */ - dbuf = &up->rxbuf; - dbuf->buf = kzalloc(HSU_DMA_BUF_SIZE, GFP_KERNEL); - if (!dbuf->buf) { - up->use_dma = 0; - goto exit; - } - dbuf->dma_addr = dma_map_single(port->dev, - dbuf->buf, - HSU_DMA_BUF_SIZE, - DMA_FROM_DEVICE); - dbuf->dma_size = HSU_DMA_BUF_SIZE; - - /* Start the RX channel right now */ - hsu_dma_start_rx_chan(up->rxc, dbuf); - - /* Next init the TX DMA */ - dbuf = &up->txbuf; - dbuf->buf = xmit->buf; - dbuf->dma_addr = dma_map_single(port->dev, - dbuf->buf, - UART_XMIT_SIZE, - DMA_TO_DEVICE); - dbuf->dma_size = UART_XMIT_SIZE; - - /* This should not be changed all around */ - chan_writel(up->txc, HSU_CH_BSR, 32); - chan_writel(up->txc, HSU_CH_MOTSR, 4); - dbuf->ofs = 0; - } - -exit: - /* And clear the interrupt registers again for luck. */ - (void) serial_in(up, UART_LSR); - (void) serial_in(up, UART_RX); - (void) serial_in(up, UART_IIR); - (void) serial_in(up, UART_MSR); - - up->running = 1; - return 0; -} - -static void serial_hsu_shutdown(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned long flags; - - /* Disable interrupts from this port */ - up->ier = 0; - serial_out(up, UART_IER, 0); - up->running = 0; - - spin_lock_irqsave(&up->port.lock, flags); - up->port.mctrl &= ~TIOCM_OUT2; - serial_hsu_set_mctrl(&up->port, up->port.mctrl); - spin_unlock_irqrestore(&up->port.lock, flags); - - /* Disable break condition and FIFOs */ - serial_out(up, UART_LCR, serial_in(up, UART_LCR) & ~UART_LCR_SBC); - serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO | - UART_FCR_CLEAR_RCVR | - UART_FCR_CLEAR_XMIT); - serial_out(up, UART_FCR, 0); - - pm_runtime_put(up->dev); -} - -static void -serial_hsu_set_termios(struct uart_port *port, struct ktermios *termios, - struct ktermios *old) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - unsigned char cval, fcr = 0; - unsigned long flags; - unsigned int baud, quot; - u32 ps, mul; - - switch (termios->c_cflag & CSIZE) { - case CS5: - cval = UART_LCR_WLEN5; - break; - case CS6: - cval = UART_LCR_WLEN6; - break; - case CS7: - cval = UART_LCR_WLEN7; - break; - default: - case CS8: - cval = UART_LCR_WLEN8; - break; - } - - /* CMSPAR isn't supported by this driver */ - termios->c_cflag &= ~CMSPAR; - - if (termios->c_cflag & CSTOPB) - cval |= UART_LCR_STOP; - if (termios->c_cflag & PARENB) - cval |= UART_LCR_PARITY; - if (!(termios->c_cflag & PARODD)) - cval |= UART_LCR_EPAR; - - /* - * The base clk is 50Mhz, and the baud rate come from: - * baud = 50M * MUL / (DIV * PS * DLAB) - * - * For those basic low baud rate we can get the direct - * scalar from 2746800, like 115200 = 2746800/24. For those - * higher baud rate, we handle them case by case, mainly by - * adjusting the MUL/PS registers, and DIV register is kept - * as default value 0x3d09 to make things simple - */ - baud = uart_get_baud_rate(port, termios, old, 0, 4000000); - - quot = 1; - ps = 0x10; - mul = 0x3600; - switch (baud) { - case 3500000: - mul = 0x3345; - ps = 0xC; - break; - case 1843200: - mul = 0x2400; - break; - case 3000000: - case 2500000: - case 2000000: - case 1500000: - case 1000000: - case 500000: - /* mul/ps/quot = 0x9C4/0x10/0x1 will make a 500000 bps */ - mul = baud / 500000 * 0x9C4; - break; - default: - /* Use uart_get_divisor to get quot for other baud rates */ - quot = 0; - } - - if (!quot) - quot = uart_get_divisor(port, baud); - - if ((up->port.uartclk / quot) < (2400 * 16)) - fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_1B; - else if ((up->port.uartclk / quot) < (230400 * 16)) - fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_16B; - else - fcr = UART_FCR_ENABLE_FIFO | UART_FCR_HSU_64_32B; - - fcr |= UART_FCR_HSU_64B_FIFO; - - /* - * Ok, we're now changing the port state. Do it with - * interrupts disabled. - */ - spin_lock_irqsave(&up->port.lock, flags); - - /* Update the per-port timeout */ - uart_update_timeout(port, termios->c_cflag, baud); - - up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR; - if (termios->c_iflag & INPCK) - up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE; - if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) - up->port.read_status_mask |= UART_LSR_BI; - - /* Characters to ignore */ - up->port.ignore_status_mask = 0; - if (termios->c_iflag & IGNPAR) - up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE; - if (termios->c_iflag & IGNBRK) { - up->port.ignore_status_mask |= UART_LSR_BI; - /* - * If we're ignoring parity and break indicators, - * ignore overruns too (for real raw support). - */ - if (termios->c_iflag & IGNPAR) - up->port.ignore_status_mask |= UART_LSR_OE; - } - - /* Ignore all characters if CREAD is not set */ - if ((termios->c_cflag & CREAD) == 0) - up->port.ignore_status_mask |= UART_LSR_DR; - - /* - * CTS flow control flag and modem status interrupts, disable - * MSI by default - */ - up->ier &= ~UART_IER_MSI; - if (UART_ENABLE_MS(&up->port, termios->c_cflag)) - up->ier |= UART_IER_MSI; - - serial_out(up, UART_IER, up->ier); - - if (termios->c_cflag & CRTSCTS) - up->mcr |= UART_MCR_AFE | UART_MCR_RTS; - else - up->mcr &= ~UART_MCR_AFE; - - serial_out(up, UART_LCR, cval | UART_LCR_DLAB); /* set DLAB */ - serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */ - serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */ - serial_out(up, UART_LCR, cval); /* reset DLAB */ - serial_out(up, UART_MUL, mul); /* set MUL */ - serial_out(up, UART_PS, ps); /* set PS */ - up->lcr = cval; /* Save LCR */ - serial_hsu_set_mctrl(&up->port, up->port.mctrl); - serial_out(up, UART_FCR, fcr); - spin_unlock_irqrestore(&up->port.lock, flags); -} - -static void -serial_hsu_pm(struct uart_port *port, unsigned int state, - unsigned int oldstate) -{ -} - -static void serial_hsu_release_port(struct uart_port *port) -{ -} - -static int serial_hsu_request_port(struct uart_port *port) -{ - return 0; -} - -static void serial_hsu_config_port(struct uart_port *port, int flags) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - up->port.type = PORT_MFD; -} - -static int -serial_hsu_verify_port(struct uart_port *port, struct serial_struct *ser) -{ - /* We don't want the core code to modify any port params */ - return -EINVAL; -} - -static const char * -serial_hsu_type(struct uart_port *port) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - return up->name; -} - -/* Mainly for uart console use */ -static struct uart_hsu_port *serial_hsu_ports[3]; -static struct uart_driver serial_hsu_reg; - -#ifdef CONFIG_SERIAL_MFD_HSU_CONSOLE - -#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) - -/* Wait for transmitter & holding register to empty */ -static inline void wait_for_xmitr(struct uart_hsu_port *up) -{ - unsigned int status, tmout = 1000; - - /* Wait up to 1ms for the character to be sent. */ - do { - status = serial_in(up, UART_LSR); - - if (status & UART_LSR_BI) - up->lsr_break_flag = UART_LSR_BI; - - if (--tmout == 0) - break; - udelay(1); - } while (!(status & BOTH_EMPTY)); - - /* Wait up to 1s for flow control if necessary */ - if (up->port.flags & UPF_CONS_FLOW) { - tmout = 1000000; - while (--tmout && - ((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0)) - udelay(1); - } -} - -static void serial_hsu_console_putchar(struct uart_port *port, int ch) -{ - struct uart_hsu_port *up = - container_of(port, struct uart_hsu_port, port); - - wait_for_xmitr(up); - serial_out(up, UART_TX, ch); -} - -/* - * Print a string to the serial port trying not to disturb - * any possible real use of the port... - * - * The console_lock must be held when we get here. - */ -static void -serial_hsu_console_write(struct console *co, const char *s, unsigned int count) -{ - struct uart_hsu_port *up = serial_hsu_ports[co->index]; - unsigned long flags; - unsigned int ier; - int locked = 1; - - touch_nmi_watchdog(); - - local_irq_save(flags); - if (up->port.sysrq) - locked = 0; - else if (oops_in_progress) { - locked = spin_trylock(&up->port.lock); - } else - spin_lock(&up->port.lock); - - /* First save the IER then disable the interrupts */ - ier = serial_in(up, UART_IER); - serial_out(up, UART_IER, 0); - - uart_console_write(&up->port, s, count, serial_hsu_console_putchar); - - /* - * Finally, wait for transmitter to become empty - * and restore the IER - */ - wait_for_xmitr(up); - serial_out(up, UART_IER, ier); - - if (locked) - spin_unlock(&up->port.lock); - local_irq_restore(flags); -} - -static struct console serial_hsu_console; - -static int __init -serial_hsu_console_setup(struct console *co, char *options) -{ - struct uart_hsu_port *up; - int baud = 115200; - int bits = 8; - int parity = 'n'; - int flow = 'n'; - - if (co->index == -1 || co->index >= serial_hsu_reg.nr) - co->index = 0; - up = serial_hsu_ports[co->index]; - if (!up) - return -ENODEV; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); - - return uart_set_options(&up->port, co, baud, parity, bits, flow); -} - -static struct console serial_hsu_console = { - .name = "ttyMFD", - .write = serial_hsu_console_write, - .device = uart_console_device, - .setup = serial_hsu_console_setup, - .flags = CON_PRINTBUFFER, - .index = -1, - .data = &serial_hsu_reg, -}; - -#define SERIAL_HSU_CONSOLE (&serial_hsu_console) -#else -#define SERIAL_HSU_CONSOLE NULL -#endif - -static struct uart_ops serial_hsu_pops = { - .tx_empty = serial_hsu_tx_empty, - .set_mctrl = serial_hsu_set_mctrl, - .get_mctrl = serial_hsu_get_mctrl, - .stop_tx = serial_hsu_stop_tx, - .start_tx = serial_hsu_start_tx, - .stop_rx = serial_hsu_stop_rx, - .enable_ms = serial_hsu_enable_ms, - .break_ctl = serial_hsu_break_ctl, - .startup = serial_hsu_startup, - .shutdown = serial_hsu_shutdown, - .set_termios = serial_hsu_set_termios, - .pm = serial_hsu_pm, - .type = serial_hsu_type, - .release_port = serial_hsu_release_port, - .request_port = serial_hsu_request_port, - .config_port = serial_hsu_config_port, - .verify_port = serial_hsu_verify_port, -}; - -static struct uart_driver serial_hsu_reg = { - .owner = THIS_MODULE, - .driver_name = "MFD serial", - .dev_name = "ttyMFD", - .major = TTY_MAJOR, - .minor = 128, - .nr = 3, - .cons = SERIAL_HSU_CONSOLE, -}; - -#ifdef CONFIG_PM -static int serial_hsu_suspend(struct pci_dev *pdev, pm_message_t state) -{ - void *priv = pci_get_drvdata(pdev); - struct uart_hsu_port *up; - - /* Make sure this is not the internal dma controller */ - if (priv && (pdev->device != 0x081E)) { - up = priv; - uart_suspend_port(&serial_hsu_reg, &up->port); - } - - pci_save_state(pdev); - pci_set_power_state(pdev, pci_choose_state(pdev, state)); - return 0; -} - -static int serial_hsu_resume(struct pci_dev *pdev) -{ - void *priv = pci_get_drvdata(pdev); - struct uart_hsu_port *up; - int ret; - - pci_set_power_state(pdev, PCI_D0); - pci_restore_state(pdev); - - ret = pci_enable_device(pdev); - if (ret) - dev_warn(&pdev->dev, - "HSU: can't re-enable device, try to continue\n"); - - if (priv && (pdev->device != 0x081E)) { - up = priv; - uart_resume_port(&serial_hsu_reg, &up->port); - } - return 0; -} - -static int serial_hsu_runtime_idle(struct device *dev) -{ - pm_schedule_suspend(dev, 500); - return -EBUSY; -} - -static int serial_hsu_runtime_suspend(struct device *dev) -{ - return 0; -} - -static int serial_hsu_runtime_resume(struct device *dev) -{ - return 0; -} -#else -#define serial_hsu_suspend NULL -#define serial_hsu_resume NULL -#define serial_hsu_runtime_idle NULL -#define serial_hsu_runtime_suspend NULL -#define serial_hsu_runtime_resume NULL -#endif - -static const struct dev_pm_ops serial_hsu_pm_ops = { - .runtime_suspend = serial_hsu_runtime_suspend, - .runtime_resume = serial_hsu_runtime_resume, - .runtime_idle = serial_hsu_runtime_idle, -}; - -/* temp global pointer before we settle down on using one or four PCI dev */ -static struct hsu_port *phsu; - -static int serial_hsu_probe(struct pci_dev *pdev, - const struct pci_device_id *ent) -{ - struct uart_hsu_port *uport; - int index, ret; - - printk(KERN_INFO "HSU: found PCI Serial controller(ID: %04x:%04x)\n", - pdev->vendor, pdev->device); - - switch (pdev->device) { - case 0x081B: - index = 0; - break; - case 0x081C: - index = 1; - break; - case 0x081D: - index = 2; - break; - case 0x081E: - /* internal DMA controller */ - index = 3; - break; - default: - dev_err(&pdev->dev, "HSU: out of index!"); - return -ENODEV; - } - - ret = pci_enable_device(pdev); - if (ret) - return ret; - - if (index == 3) { - /* DMA controller */ - ret = request_irq(pdev->irq, dma_irq, 0, "hsu_dma", phsu); - if (ret) { - dev_err(&pdev->dev, "can not get IRQ\n"); - goto err_disable; - } - pci_set_drvdata(pdev, phsu); - } else { - /* UART port 0~2 */ - uport = &phsu->port[index]; - uport->port.irq = pdev->irq; - uport->port.dev = &pdev->dev; - uport->dev = &pdev->dev; - - ret = request_irq(pdev->irq, port_irq, 0, uport->name, uport); - if (ret) { - dev_err(&pdev->dev, "can not get IRQ\n"); - goto err_disable; - } - uart_add_one_port(&serial_hsu_reg, &uport->port); - - pci_set_drvdata(pdev, uport); - } - - pm_runtime_put_noidle(&pdev->dev); - pm_runtime_allow(&pdev->dev); - - return 0; - -err_disable: - pci_disable_device(pdev); - return ret; -} - -static void hsu_global_init(void) -{ - struct hsu_port *hsu; - struct uart_hsu_port *uport; - struct hsu_dma_chan *dchan; - int i, ret; - - hsu = kzalloc(sizeof(struct hsu_port), GFP_KERNEL); - if (!hsu) - return; - - /* Get basic io resource and map it */ - hsu->paddr = 0xffa28000; - hsu->iolen = 0x1000; - - if (!(request_mem_region(hsu->paddr, hsu->iolen, "HSU global"))) - pr_warn("HSU: error in request mem region\n"); - - hsu->reg = ioremap_nocache((unsigned long)hsu->paddr, hsu->iolen); - if (!hsu->reg) { - pr_err("HSU: error in ioremap\n"); - ret = -ENOMEM; - goto err_free_region; - } - - /* Initialise the 3 UART ports */ - uport = hsu->port; - for (i = 0; i < 3; i++) { - uport->port.type = PORT_MFD; - uport->port.iotype = UPIO_MEM; - uport->port.mapbase = (resource_size_t)hsu->paddr - + HSU_PORT_REG_OFFSET - + i * HSU_PORT_REG_LENGTH; - uport->port.membase = hsu->reg + HSU_PORT_REG_OFFSET - + i * HSU_PORT_REG_LENGTH; - - sprintf(uport->name, "hsu_port%d", i); - uport->port.fifosize = 64; - uport->port.ops = &serial_hsu_pops; - uport->port.line = i; - uport->port.flags = UPF_IOREMAP; - /* set the scalable maxim support rate to 2746800 bps */ - uport->port.uartclk = 115200 * 24 * 16; - - uport->running = 0; - uport->txc = &hsu->chans[i * 2]; - uport->rxc = &hsu->chans[i * 2 + 1]; - - serial_hsu_ports[i] = uport; - uport->index = i; - - if (hsu_dma_enable & (1<use_dma = 1; - else - uport->use_dma = 0; - - uport++; - } - - /* Initialise 6 dma channels */ - dchan = hsu->chans; - for (i = 0; i < 6; i++) { - dchan->id = i; - dchan->dirt = (i & 0x1) ? DMA_FROM_DEVICE : DMA_TO_DEVICE; - dchan->uport = &hsu->port[i/2]; - dchan->reg = hsu->reg + HSU_DMA_CHANS_REG_OFFSET + - i * HSU_DMA_CHANS_REG_LENGTH; - - dchan++; - } - - phsu = hsu; - hsu_debugfs_init(hsu); - return; - -err_free_region: - release_mem_region(hsu->paddr, hsu->iolen); - kfree(hsu); - return; -} - -static void serial_hsu_remove(struct pci_dev *pdev) -{ - void *priv = pci_get_drvdata(pdev); - struct uart_hsu_port *up; - - if (!priv) - return; - - pm_runtime_forbid(&pdev->dev); - pm_runtime_get_noresume(&pdev->dev); - - /* For port 0/1/2, priv is the address of uart_hsu_port */ - if (pdev->device != 0x081E) { - up = priv; - uart_remove_one_port(&serial_hsu_reg, &up->port); - } - - free_irq(pdev->irq, priv); - pci_disable_device(pdev); -} - -/* First 3 are UART ports, and the 4th is the DMA */ -static const struct pci_device_id pci_ids[] = { - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) }, - { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081E) }, - {}, -}; - -static struct pci_driver hsu_pci_driver = { - .name = "HSU serial", - .id_table = pci_ids, - .probe = serial_hsu_probe, - .remove = serial_hsu_remove, - .suspend = serial_hsu_suspend, - .resume = serial_hsu_resume, - .driver = { - .pm = &serial_hsu_pm_ops, - }, -}; - -static int __init hsu_pci_init(void) -{ - int ret; - - hsu_global_init(); - - ret = uart_register_driver(&serial_hsu_reg); - if (ret) - return ret; - - return pci_register_driver(&hsu_pci_driver); -} - -static void __exit hsu_pci_exit(void) -{ - pci_unregister_driver(&hsu_pci_driver); - uart_unregister_driver(&serial_hsu_reg); - - hsu_debugfs_remove(phsu); - - kfree(phsu); -} - -module_init(hsu_pci_init); -module_exit(hsu_pci_exit); - -MODULE_LICENSE("GPL v2"); -MODULE_DEVICE_TABLE(pci, pci_ids); diff --git a/include/linux/serial_mfd.h b/include/linux/serial_mfd.h deleted file mode 100644 index 2b071e0b034d..000000000000 --- a/include/linux/serial_mfd.h +++ /dev/null @@ -1,47 +0,0 @@ -#ifndef _SERIAL_MFD_H_ -#define _SERIAL_MFD_H_ - -/* HW register offset definition */ -#define UART_FOR 0x08 -#define UART_PS 0x0C -#define UART_MUL 0x0D -#define UART_DIV 0x0E - -#define HSU_GBL_IEN 0x0 -#define HSU_GBL_IST 0x4 - -#define HSU_GBL_INT_BIT_PORT0 0x0 -#define HSU_GBL_INT_BIT_PORT1 0x1 -#define HSU_GBL_INT_BIT_PORT2 0x2 -#define HSU_GBL_INT_BIT_IRI 0x3 -#define HSU_GBL_INT_BIT_HDLC 0x4 -#define HSU_GBL_INT_BIT_DMA 0x5 - -#define HSU_GBL_ISR 0x8 -#define HSU_GBL_DMASR 0x400 -#define HSU_GBL_DMAISR 0x404 - -#define HSU_PORT_REG_OFFSET 0x80 -#define HSU_PORT0_REG_OFFSET 0x80 -#define HSU_PORT1_REG_OFFSET 0x100 -#define HSU_PORT2_REG_OFFSET 0x180 -#define HSU_PORT_REG_LENGTH 0x80 - -#define HSU_DMA_CHANS_REG_OFFSET 0x500 -#define HSU_DMA_CHANS_REG_LENGTH 0x40 - -#define HSU_CH_SR 0x0 /* channel status reg */ -#define HSU_CH_CR 0x4 /* control reg */ -#define HSU_CH_DCR 0x8 /* descriptor control reg */ -#define HSU_CH_BSR 0x10 /* max fifo buffer size reg */ -#define HSU_CH_MOTSR 0x14 /* minimum ocp transfer size */ -#define HSU_CH_D0SAR 0x20 /* desc 0 start addr */ -#define HSU_CH_D0TSR 0x24 /* desc 0 transfer size */ -#define HSU_CH_D1SAR 0x28 -#define HSU_CH_D1TSR 0x2C -#define HSU_CH_D2SAR 0x30 -#define HSU_CH_D2TSR 0x34 -#define HSU_CH_D3SAR 0x38 -#define HSU_CH_D3TSR 0x3C - -#endif diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h index 00adb01fa5f3..e9b4cb0cd7ed 100644 --- a/include/uapi/linux/serial_reg.h +++ b/include/uapi/linux/serial_reg.h @@ -241,25 +241,6 @@ #define UART_FCR_PXAR16 0x80 /* receive FIFO threshold = 16 */ #define UART_FCR_PXAR32 0xc0 /* receive FIFO threshold = 32 */ -/* - * Intel MID on-chip HSU (High Speed UART) defined bits - */ -#define UART_FCR_HSU_64_1B 0x00 /* receive FIFO treshold = 1 */ -#define UART_FCR_HSU_64_16B 0x40 /* receive FIFO treshold = 16 */ -#define UART_FCR_HSU_64_32B 0x80 /* receive FIFO treshold = 32 */ -#define UART_FCR_HSU_64_56B 0xc0 /* receive FIFO treshold = 56 */ - -#define UART_FCR_HSU_16_1B 0x00 /* receive FIFO treshold = 1 */ -#define UART_FCR_HSU_16_4B 0x40 /* receive FIFO treshold = 4 */ -#define UART_FCR_HSU_16_8B 0x80 /* receive FIFO treshold = 8 */ -#define UART_FCR_HSU_16_14B 0xc0 /* receive FIFO treshold = 14 */ - -#define UART_FCR_HSU_64B_FIFO 0x20 /* chose 64 bytes FIFO */ -#define UART_FCR_HSU_16B_FIFO 0x00 /* chose 16 bytes FIFO */ - -#define UART_FCR_HALF_EMPT_TXI 0x00 /* trigger TX_EMPT IRQ for half empty */ -#define UART_FCR_FULL_EMPT_TXI 0x08 /* trigger TX_EMPT IRQ for full empty */ - /* * These register definitions are for the 16C950 */ -- cgit From 91555ce9012557b2d621d7b0b6ec694218a2a9bc Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:05 +0100 Subject: serial: imx: Fix clearing of receiver overrun flag MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The writeable bits in the USR2 register are all "write 1 to clear" so only write the bits that actually should be cleared. Fixes: f1f836e4209e ("serial: imx: Add Rx Fifo overrun error message") Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index ca00b3f1520f..0f2afae25f6e 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -818,7 +818,7 @@ static irqreturn_t imx_int(int irq, void *dev_id) if (sts2 & USR2_ORE) { dev_err(sport->port.dev, "Rx FIFO overrun\n"); sport->port.icount.overrun++; - writel(sts2 | USR2_ORE, sport->port.membase + USR2); + writel(USR2_ORE, sport->port.membase + USR2); } return IRQ_HANDLED; @@ -1181,10 +1181,12 @@ static int imx_startup(struct uart_port *port) imx_uart_dma_init(sport); spin_lock_irqsave(&sport->port.lock, flags); + /* * Finally, clear and enable interrupts */ writel(USR1_RTSD, sport->port.membase + USR1); + writel(USR2_ORE, sport->port.membase + USR2); if (sport->dma_is_inited && !sport->dma_is_enabled) imx_enable_dma(sport); @@ -1199,10 +1201,6 @@ static int imx_startup(struct uart_port *port) writel(temp, sport->port.membase + UCR1); - /* Clear any pending ORE flag before enabling interrupt */ - temp = readl(sport->port.membase + USR2); - writel(temp | USR2_ORE, sport->port.membase + USR2); - temp = readl(sport->port.membase + UCR4); temp |= UCR4_OREN; writel(temp, sport->port.membase + UCR4); -- cgit From 694e6729bf0e317e0b67c37cda1b74a5b04fbc07 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:06 +0100 Subject: serial: imx: remove long dead code MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This if (0) exists since the driver was introduced in commit c49bde83eb6a ([ARM PATCH] 1956/2: Re: Motorola i.MX serial driver) back in 2004. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 9 --------- 1 file changed, 9 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 0f2afae25f6e..9e3a8ffe97b4 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1370,15 +1370,6 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, unsigned long num, denom; uint64_t tdiv64; - /* - * If we don't support modem control lines, don't allow - * these to be set. - */ - if (0) { - termios->c_cflag &= ~(HUPCL | CRTSCTS | CMSPAR); - termios->c_cflag |= CLOCAL; - } - /* * We only support CS7 and CS8. */ -- cgit From 842633bdcee64d5c1861eb67677e3500c5d208e6 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:07 +0100 Subject: serial: imx: drop members from driver data that are only used during probe MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit There is no benefit in keeping this information in RAM when it's not used any more, so better use function local variables instead. These members are unused since c0d1c6b0f0dc ("serial: imx: Fix the reporting of interrupts") Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 21 +++++++++++---------- 1 file changed, 11 insertions(+), 10 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 9e3a8ffe97b4..65251984ba03 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -206,7 +206,6 @@ struct imx_port { struct uart_port port; struct timer_list timer; unsigned int old_status; - int txirq, rxirq, rtsirq; unsigned int have_rtscts:1; unsigned int dte_mode:1; unsigned int use_irda:1; @@ -1956,6 +1955,7 @@ static int serial_imx_probe(struct platform_device *pdev) void __iomem *base; int ret = 0; struct resource *res; + int txirq, rxirq, rtsirq; sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); if (!sport) @@ -1972,15 +1972,16 @@ static int serial_imx_probe(struct platform_device *pdev) if (IS_ERR(base)) return PTR_ERR(base); + rxirq = platform_get_irq(pdev, 0); + txirq = platform_get_irq(pdev, 1); + rtsirq = platform_get_irq(pdev, 2); + sport->port.dev = &pdev->dev; sport->port.mapbase = res->start; sport->port.membase = base; sport->port.type = PORT_IMX, sport->port.iotype = UPIO_MEM; - sport->port.irq = platform_get_irq(pdev, 0); - sport->rxirq = platform_get_irq(pdev, 0); - sport->txirq = platform_get_irq(pdev, 1); - sport->rtsirq = platform_get_irq(pdev, 2); + sport->port.irq = rxirq; sport->port.fifosize = 32; sport->port.ops = &imx_pops; sport->port.flags = UPF_BOOT_AUTOCONF; @@ -2008,27 +2009,27 @@ static int serial_imx_probe(struct platform_device *pdev) * Allocate the IRQ(s) i.MX1 has three interrupts whereas later * chips only have one interrupt. */ - if (sport->txirq > 0) { - ret = devm_request_irq(&pdev->dev, sport->rxirq, imx_rxint, 0, + if (txirq > 0) { + ret = devm_request_irq(&pdev->dev, rxirq, imx_rxint, 0, dev_name(&pdev->dev), sport); if (ret) return ret; - ret = devm_request_irq(&pdev->dev, sport->txirq, imx_txint, 0, + ret = devm_request_irq(&pdev->dev, txirq, imx_txint, 0, dev_name(&pdev->dev), sport); if (ret) return ret; /* do not use RTS IRQ on IrDA */ if (!USE_IRDA(sport)) { - ret = devm_request_irq(&pdev->dev, sport->rtsirq, + ret = devm_request_irq(&pdev->dev, rtsirq, imx_rtsint, 0, dev_name(&pdev->dev), sport); if (ret) return ret; } } else { - ret = devm_request_irq(&pdev->dev, sport->port.irq, imx_int, 0, + ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0, dev_name(&pdev->dev), sport); if (ret) return ret; -- cgit From f890cef24bc0e17ea9a1f5c39d9105f3e8bc4f13 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:08 +0100 Subject: serial: imx: reformat and cleanup copyright header MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix indention, remove old address of the FSF, remove in-file changelog, mention Freescale. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 19 ++++++------------- 1 file changed, 6 insertions(+), 13 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 65251984ba03..6ec35e1168eb 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1,13 +1,13 @@ /* - * Driver for Motorola IMX serial ports + * Driver for Motorola/Freescale IMX serial ports * - * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. + * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o. * - * Author: Sascha Hauer - * Copyright (C) 2004 Pengutronix + * Author: Sascha Hauer + * Copyright (C) 2004 Pengutronix * - * Copyright (C) 2009 emlix GmbH - * Author: Fabian Godehardt (added IrDA support for iMX) + * Author: Fabian Godehardt (added IrDA support for iMX) + * Copyright (C) 2009 emlix GmbH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -18,13 +18,6 @@ * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * [29-Mar-2005] Mike Lee - * Added hardware handshake */ #if defined(CONFIG_SERIAL_IMX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) -- cgit From f95661b2f2ae75c9b07b9b4e0a9a55c40e085e6f Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:09 +0100 Subject: serial: imx: fix comment about which machines use the i.MX21 type MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 6ec35e1168eb..cbbb47385877 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -182,7 +182,7 @@ #define UART_NR 8 -/* i.mx21 type uart runs on all i.mx except i.mx1 */ +/* i.MX21 type uart runs on all i.mx except i.MX1 and i.MX6q */ enum imx_uart_type { IMX1_UART, IMX21_UART, -- cgit From afe9cbb1a6adf6da5fa6d4747d102b95b4bb52c1 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:10 +0100 Subject: serial: imx: drop support for IRDA MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Support for IRDA was added in 2009 in commit v2.6.31-rc1~399^2~2. There are no in-tree users. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 157 ++----------------------------- include/linux/platform_data/serial-imx.h | 5 - 2 files changed, 9 insertions(+), 153 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index cbbb47385877..6dc1d2781b86 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -6,9 +6,6 @@ * Author: Sascha Hauer * Copyright (C) 2004 Pengutronix * - * Author: Fabian Godehardt (added IrDA support for iMX) - * Copyright (C) 2009 emlix GmbH - * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or @@ -201,7 +198,6 @@ struct imx_port { unsigned int old_status; unsigned int have_rtscts:1; unsigned int dte_mode:1; - unsigned int use_irda:1; unsigned int irda_inv_rx:1; unsigned int irda_inv_tx:1; unsigned short trcv_delay; /* transceiver delay */ @@ -228,12 +224,6 @@ struct imx_port_ucrs { unsigned int ucr3; }; -#ifdef CONFIG_IRDA -#define USE_IRDA(sport) ((sport)->use_irda) -#else -#define USE_IRDA(sport) (0) -#endif - static struct imx_uart_data imx_uart_devdata[] = { [IMX1_UART] = { .uts_reg = IMX1_UTS, @@ -368,48 +358,6 @@ static void imx_stop_tx(struct uart_port *port) struct imx_port *sport = (struct imx_port *)port; unsigned long temp; - if (USE_IRDA(sport)) { - /* half duplex - wait for end of transmission */ - int n = 256; - while ((--n > 0) && - !(readl(sport->port.membase + USR2) & USR2_TXDC)) { - udelay(5); - barrier(); - } - /* - * irda transceiver - wait a bit more to avoid - * cutoff, hardware dependent - */ - udelay(sport->trcv_delay); - - /* - * half duplex - reactivate receive mode, - * flush receive pipe echo crap - */ - if (readl(sport->port.membase + USR2) & USR2_TXDC) { - temp = readl(sport->port.membase + UCR1); - temp &= ~(UCR1_TXMPTYEN | UCR1_TRDYEN); - writel(temp, sport->port.membase + UCR1); - - temp = readl(sport->port.membase + UCR4); - temp &= ~(UCR4_TCEN); - writel(temp, sport->port.membase + UCR4); - - while (readl(sport->port.membase + URXD0) & - URXD_CHARRDY) - barrier(); - - temp = readl(sport->port.membase + UCR1); - temp |= UCR1_RRDYEN; - writel(temp, sport->port.membase + UCR1); - - temp = readl(sport->port.membase + UCR4); - temp |= UCR4_DREN; - writel(temp, sport->port.membase + UCR4); - } - return; - } - /* * We are maybe in the SMP context, so if the DMA TX thread is running * on other cpu, we have to wait for it to finish. @@ -612,32 +560,11 @@ static void imx_start_tx(struct uart_port *port) struct imx_port *sport = (struct imx_port *)port; unsigned long temp; - if (USE_IRDA(sport)) { - /* half duplex in IrDA mode; have to disable receive mode */ - temp = readl(sport->port.membase + UCR4); - temp &= ~(UCR4_DREN); - writel(temp, sport->port.membase + UCR4); - - temp = readl(sport->port.membase + UCR1); - temp &= ~(UCR1_RRDYEN); - writel(temp, sport->port.membase + UCR1); - } - if (!sport->dma_is_enabled) { temp = readl(sport->port.membase + UCR1); writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); } - if (USE_IRDA(sport)) { - temp = readl(sport->port.membase + UCR1); - temp |= UCR1_TRDYEN; - writel(temp, sport->port.membase + UCR1); - - temp = readl(sport->port.membase + UCR4); - temp |= UCR4_TCEN; - writel(temp, sport->port.membase + UCR4); - } - if (sport->dma_is_enabled) { if (sport->port.x_char) { /* We have X-char to send, so enable TX IRQ and @@ -1148,9 +1075,6 @@ static int imx_startup(struct uart_port *port) */ temp = readl(sport->port.membase + UCR4); - if (USE_IRDA(sport)) - temp |= UCR4_IRSC; - /* set the trigger level for CTS */ temp &= ~(UCR4_CTSTL_MASK << UCR4_CTSTL_SHF); temp |= CTSTL << UCR4_CTSTL_SHF; @@ -1186,11 +1110,6 @@ static int imx_startup(struct uart_port *port) temp = readl(sport->port.membase + UCR1); temp |= UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN; - if (USE_IRDA(sport)) { - temp |= UCR1_IREN; - temp &= ~(UCR1_RTSDEN); - } - writel(temp, sport->port.membase + UCR1); temp = readl(sport->port.membase + UCR4); @@ -1209,38 +1128,12 @@ static int imx_startup(struct uart_port *port) writel(temp, sport->port.membase + UCR3); } - if (USE_IRDA(sport)) { - temp = readl(sport->port.membase + UCR4); - if (sport->irda_inv_rx) - temp |= UCR4_INVR; - else - temp &= ~(UCR4_INVR); - writel(temp | UCR4_DREN, sport->port.membase + UCR4); - - temp = readl(sport->port.membase + UCR3); - if (sport->irda_inv_tx) - temp |= UCR3_INVT; - else - temp &= ~(UCR3_INVT); - writel(temp, sport->port.membase + UCR3); - } - /* * Enable modem status interrupts */ imx_enable_ms(&sport->port); spin_unlock_irqrestore(&sport->port.lock, flags); - if (USE_IRDA(sport)) { - struct imxuart_platform_data *pdata; - pdata = dev_get_platdata(sport->port.dev); - sport->irda_inv_rx = pdata->irda_inv_rx; - sport->irda_inv_tx = pdata->irda_inv_tx; - sport->trcv_delay = pdata->transceiver_delay; - if (pdata->irda_enable) - pdata->irda_enable(1); - } - return 0; } @@ -1276,13 +1169,6 @@ static void imx_shutdown(struct uart_port *port) writel(temp, sport->port.membase + UCR2); spin_unlock_irqrestore(&sport->port.lock, flags); - if (USE_IRDA(sport)) { - struct imxuart_platform_data *pdata; - pdata = dev_get_platdata(sport->port.dev); - if (pdata->irda_enable) - pdata->irda_enable(0); - } - /* * Stop our timer. */ @@ -1295,8 +1181,6 @@ static void imx_shutdown(struct uart_port *port) spin_lock_irqsave(&sport->port.lock, flags); temp = readl(sport->port.membase + UCR1); temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN); - if (USE_IRDA(sport)) - temp &= ~(UCR1_IREN); writel(temp, sport->port.membase + UCR1); spin_unlock_irqrestore(&sport->port.lock, flags); @@ -1450,24 +1334,16 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, sport->port.membase + UCR2); old_txrxen &= (UCR2_TXEN | UCR2_RXEN); - if (USE_IRDA(sport)) { - /* - * use maximum available submodule frequency to - * avoid missing short pulses due to low sampling rate - */ + /* custom-baudrate handling */ + div = sport->port.uartclk / (baud * 16); + if (baud == 38400 && quot != div) + baud = sport->port.uartclk / (quot * 16); + + div = sport->port.uartclk / (baud * 16); + if (div > 7) + div = 7; + if (!div) div = 1; - } else { - /* custom-baudrate handling */ - div = sport->port.uartclk / (baud * 16); - if (baud == 38400 && quot != div) - baud = sport->port.uartclk / (quot * 16); - - div = sport->port.uartclk / (baud * 16); - if (div > 7) - div = 7; - if (!div) - div = 1; - } rational_best_approximation(16 * div * baud, sport->port.uartclk, 1 << 16, 1 << 16, &num, &denom); @@ -1906,9 +1782,6 @@ static int serial_imx_probe_dt(struct imx_port *sport, if (of_get_property(np, "fsl,uart-has-rtscts", NULL)) sport->have_rtscts = 1; - if (of_get_property(np, "fsl,irda-mode", NULL)) - sport->use_irda = 1; - if (of_get_property(np, "fsl,dte-mode", NULL)) sport->dte_mode = 1; @@ -1937,9 +1810,6 @@ static void serial_imx_probe_pdata(struct imx_port *sport, if (pdata->flags & IMXUART_HAVE_RTSCTS) sport->have_rtscts = 1; - - if (pdata->flags & IMXUART_IRDA) - sport->use_irda = 1; } static int serial_imx_probe(struct platform_device *pdev) @@ -2012,15 +1882,6 @@ static int serial_imx_probe(struct platform_device *pdev) dev_name(&pdev->dev), sport); if (ret) return ret; - - /* do not use RTS IRQ on IrDA */ - if (!USE_IRDA(sport)) { - ret = devm_request_irq(&pdev->dev, rtsirq, - imx_rtsint, 0, - dev_name(&pdev->dev), sport); - if (ret) - return ret; - } } else { ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0, dev_name(&pdev->dev), sport); diff --git a/include/linux/platform_data/serial-imx.h b/include/linux/platform_data/serial-imx.h index 3cc2e3c40914..a938eba2f18e 100644 --- a/include/linux/platform_data/serial-imx.h +++ b/include/linux/platform_data/serial-imx.h @@ -20,14 +20,9 @@ #define ASMARM_ARCH_UART_H #define IMXUART_HAVE_RTSCTS (1<<0) -#define IMXUART_IRDA (1<<1) struct imxuart_platform_data { unsigned int flags; - void (*irda_enable)(int enable); - unsigned int irda_inv_rx:1; - unsigned int irda_inv_tx:1; - unsigned short transceiver_delay; }; #endif -- cgit From 17b8f2a3fdca29a9b296642fb3f6ad3c39ffc7d3 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 24 Feb 2015 11:17:11 +0100 Subject: serial: imx: add support for half duplex rs485 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The transmitter is expected to be controlled by the UART's RTS pin. Signed-off-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 107 +++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 95 insertions(+), 12 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index 6dc1d2781b86..ddfb672d0152 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -365,8 +365,23 @@ static void imx_stop_tx(struct uart_port *port) if (sport->dma_is_enabled && sport->dma_is_txing) return; - temp = readl(sport->port.membase + UCR1); - writel(temp & ~UCR1_TXMPTYEN, sport->port.membase + UCR1); + temp = readl(port->membase + UCR1); + writel(temp & ~UCR1_TXMPTYEN, port->membase + UCR1); + + /* in rs485 mode disable transmitter if shifter is empty */ + if (port->rs485.flags & SER_RS485_ENABLED && + readl(port->membase + USR2) & USR2_TXDC) { + temp = readl(port->membase + UCR2); + if (port->rs485.flags & SER_RS485_RTS_AFTER_SEND) + temp &= ~UCR2_CTS; + else + temp |= UCR2_CTS; + writel(temp, port->membase + UCR2); + + temp = readl(port->membase + UCR4); + temp &= ~UCR4_TCEN; + writel(temp, port->membase + UCR4); + } } /* @@ -560,6 +575,20 @@ static void imx_start_tx(struct uart_port *port) struct imx_port *sport = (struct imx_port *)port; unsigned long temp; + if (port->rs485.flags & SER_RS485_ENABLED) { + /* enable transmitter and shifter empty irq */ + temp = readl(port->membase + UCR2); + if (port->rs485.flags & SER_RS485_RTS_ON_SEND) + temp &= ~UCR2_CTS; + else + temp |= UCR2_CTS; + writel(temp, port->membase + UCR2); + + temp = readl(port->membase + UCR4); + temp |= UCR4_TCEN; + writel(temp, port->membase + UCR4); + } + if (!sport->dma_is_enabled) { temp = readl(sport->port.membase + UCR1); writel(temp | UCR1_TXMPTYEN, sport->port.membase + UCR1); @@ -715,6 +744,7 @@ static irqreturn_t imx_int(int irq, void *dev_id) unsigned int sts2; sts = readl(sport->port.membase + USR1); + sts2 = readl(sport->port.membase + USR2); if (sts & USR1_RRDY) { if (sport->dma_is_enabled) @@ -723,8 +753,10 @@ static irqreturn_t imx_int(int irq, void *dev_id) imx_rxint(irq, dev_id); } - if (sts & USR1_TRDY && - readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) + if ((sts & USR1_TRDY && + readl(sport->port.membase + UCR1) & UCR1_TXMPTYEN) || + (sts2 & USR2_TXDC && + readl(sport->port.membase + UCR4) & UCR4_TCEN)) imx_txint(irq, dev_id); if (sts & USR1_RTSD) @@ -733,7 +765,6 @@ static irqreturn_t imx_int(int irq, void *dev_id) if (sts & USR1_AWAKE) writel(USR1_AWAKE, sport->port.membase + USR1); - sts2 = readl(sport->port.membase + USR2); if (sts2 & USR2_ORE) { dev_err(sport->port.dev, "Rx FIFO overrun\n"); sport->port.icount.overrun++; @@ -785,11 +816,13 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) struct imx_port *sport = (struct imx_port *)port; unsigned long temp; - temp = readl(sport->port.membase + UCR2) & ~(UCR2_CTS | UCR2_CTSC); - if (mctrl & TIOCM_RTS) - temp |= UCR2_CTS | UCR2_CTSC; - - writel(temp, sport->port.membase + UCR2); + if (!(port->rs485.flags & SER_RS485_ENABLED)) { + temp = readl(sport->port.membase + UCR2); + temp &= ~(UCR2_CTS | UCR2_CTSC); + if (mctrl & TIOCM_RTS) + temp |= UCR2_CTS | UCR2_CTSC; + writel(temp, sport->port.membase + UCR2); + } temp = readl(sport->port.membase + uts_reg(sport)) & ~UTS_LOOP; if (mctrl & TIOCM_LOOP) @@ -1264,11 +1297,26 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, if (termios->c_cflag & CRTSCTS) { if (sport->have_rtscts) { ucr2 &= ~UCR2_IRTS; - ucr2 |= UCR2_CTSC; + + if (port->rs485.flags & SER_RS485_ENABLED) + /* + * RTS is mandatory for rs485 operation, so keep + * it under manual control and keep transmitter + * disabled. + */ + if (!(port->rs485.flags & + SER_RS485_RTS_AFTER_SEND)) + ucr2 |= UCR2_CTS; + else + ucr2 |= UCR2_CTSC; + } else { termios->c_cflag &= ~CRTSCTS; } - } + } else if (port->rs485.flags & SER_RS485_ENABLED) + /* disable transmitter */ + if (!(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) + ucr2 |= UCR2_CTS; if (termios->c_cflag & CSTOPB) ucr2 |= UCR2_STPB; @@ -1490,6 +1538,38 @@ static void imx_poll_put_char(struct uart_port *port, unsigned char c) } #endif +static int imx_rs485_config(struct uart_port *port, + struct serial_rs485 *rs485conf) +{ + struct imx_port *sport = (struct imx_port *)port; + + /* unimplemented */ + rs485conf->delay_rts_before_send = 0; + rs485conf->delay_rts_after_send = 0; + rs485conf->flags |= SER_RS485_RX_DURING_TX; + + /* RTS is required to control the transmitter */ + if (!sport->have_rtscts) + rs485conf->flags &= ~SER_RS485_ENABLED; + + if (rs485conf->flags & SER_RS485_ENABLED) { + unsigned long temp; + + /* disable transmitter */ + temp = readl(sport->port.membase + UCR2); + temp &= ~UCR2_CTSC; + if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND) + temp &= ~UCR2_CTS; + else + temp |= UCR2_CTS; + writel(temp, sport->port.membase + UCR2); + } + + port->rs485 = *rs485conf; + + return 0; +} + static struct uart_ops imx_pops = { .tx_empty = imx_tx_empty, .set_mctrl = imx_set_mctrl, @@ -1847,6 +1927,9 @@ static int serial_imx_probe(struct platform_device *pdev) sport->port.irq = rxirq; sport->port.fifosize = 32; sport->port.ops = &imx_pops; + sport->port.rs485_config = imx_rs485_config; + sport->port.rs485.flags = + SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX; sport->port.flags = UPF_BOOT_AUTOCONF; init_timer(&sport->timer); sport->timer.function = imx_timeout; -- cgit From 7950dc586092d0c7a8b881188061cc3dc133d7e9 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 12:06:34 -0500 Subject: serial: sprd: Fix iotype The Spreadtrum UART is accessed with mmio; declare the proper iotype. Also prevent userspace from assigning any other iotype via ioctl(TIOCSSERIAL). Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sprd_serial.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index be3ed3f4ad60..2e6d63eabb2e 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -491,6 +491,8 @@ static int sprd_verify_port(struct uart_port *port, return -EINVAL; if (port->irq != ser->irq) return -EINVAL; + if (port->iotype != ser->io_type) + return -EINVAL; return 0; } @@ -705,7 +707,7 @@ static int sprd_probe(struct platform_device *pdev) up->dev = &pdev->dev; up->line = index; up->type = PORT_SPRD; - up->iotype = SERIAL_IO_PORT; + up->iotype = UPIO_MEM; up->uartclk = SPRD_DEF_RATE; up->fifosize = SPRD_FIFO_SIZE; up->ops = &serial_sprd_ops; -- cgit From f6415491c5f33df1adb5983070618f30370bd346 Mon Sep 17 00:00:00 2001 From: Peter Crosthwaite Date: Tue, 24 Feb 2015 15:13:57 -0800 Subject: tty: serial: xilinx_uartps: Use Macro for ttyPS0 All instances of "ttyPS" use this macro except for this one. Convert it. Signed-off-by: Peter Crosthwaite Acked-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/xilinx_uartps.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index cff531a51a78..8f9c5430f470 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1154,7 +1154,8 @@ static int __init cdns_uart_console_setup(struct console *co, char *options) return -EINVAL; if (!port->mapbase) { - pr_debug("console on ttyPS%i not present\n", co->index); + pr_debug("console on " CDNS_UART_TTY_NAME "%i not present\n", + co->index); return -ENODEV; } -- cgit From 734745caeb9f155ab58918834a8c70e83fa6afd3 Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Wed, 4 Mar 2015 12:27:33 +0000 Subject: serial/amba-pl011: Activate TX IRQ passively The current PL011 driver transmits a dummy character when the UART is opened, to assert the TX IRQ for the first time (see pl011_startup()). The UART is put in loopback mode temporarily, so the receiver presumably shouldn't see anything. However... At least some platforms containing a PL011 send characters down the wire even when loopback mode is enabled. This means that a spurious NUL character may be seen at the receiver when the PL011 is opened through the TTY layer. The current code also temporarily sets the baud rate to maximum and the character width to the minimum, to that the dummy TX completes as quickly as possible. If this is seen by the receiver it will result in a framing error and can knock the receiver out of sync -- turning subsequent output into garbage until synchronisation is reestablished. (Particularly problematic during boot with systemd.) To avoid spurious transmissions, this patch removes assumptions about whether the TX IRQ will fire until at least one TX IRQ has been seen. Instead, the UART will unmask the TX IRQ and then slow-start via polling and timer-based soft IRQs initially. If the TTY layer writes enough data to fill the FIFO to the interrupt threshold in one go, the TX IRQ should assert, at which point the driver changes to fully interrupt-driven TX. In this way, the TX IRQ is activated as a side-effect instead of being done deliberately. This should also mean that the driver works on the SBSA Generic UART[1] (a cut-down PL011) without invasive changes. The Generic UART lacks some features needed for the dummy TX approach to work (FIFO disabling and loopback). [1] Server Base System Architecture (ARM-DEN-0029-v2.3) http://infocenter.arm.com/ (click-thru required :/) Signed-off-by: Dave Martin Tested-by: Andre Przywara Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/amba-pl011.c | 165 ++++++++++++++++++++++++++++------------ 1 file changed, 115 insertions(+), 50 deletions(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 8d94c194f090..69910f7e3991 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -58,6 +58,7 @@ #include #include #include +#include #define UART_NR 14 @@ -156,7 +157,9 @@ struct uart_amba_port { unsigned int lcrh_tx; /* vendor-specific */ unsigned int lcrh_rx; /* vendor-specific */ unsigned int old_cr; /* state during shutdown */ + struct delayed_work tx_softirq_work; bool autorts; + unsigned int tx_irq_seen; /* 0=none, 1=1, 2=2 or more */ char type[12]; #ifdef CONFIG_DMA_ENGINE /* DMA stuff */ @@ -440,8 +443,9 @@ static void pl011_dma_remove(struct uart_amba_port *uap) dma_release_channel(uap->dmarx.chan); } -/* Forward declare this for the refill routine */ +/* Forward declare these for the refill routine */ static int pl011_dma_tx_refill(struct uart_amba_port *uap); +static void pl011_start_tx_pio(struct uart_amba_port *uap); /* * The current DMA TX buffer has been sent. @@ -479,14 +483,13 @@ static void pl011_dma_tx_callback(void *data) return; } - if (pl011_dma_tx_refill(uap) <= 0) { + if (pl011_dma_tx_refill(uap) <= 0) /* * We didn't queue a DMA buffer for some reason, but we * have data pending to be sent. Re-enable the TX IRQ. */ - uap->im |= UART011_TXIM; - writew(uap->im, uap->port.membase + UART011_IMSC); - } + pl011_start_tx_pio(uap); + spin_unlock_irqrestore(&uap->port.lock, flags); } @@ -664,12 +667,10 @@ static inline bool pl011_dma_tx_start(struct uart_amba_port *uap) if (!uap->dmatx.queued) { if (pl011_dma_tx_refill(uap) > 0) { uap->im &= ~UART011_TXIM; - ret = true; - } else { - uap->im |= UART011_TXIM; + writew(uap->im, uap->port.membase + + UART011_IMSC); + } else ret = false; - } - writew(uap->im, uap->port.membase + UART011_IMSC); } else if (!(uap->dmacr & UART011_TXDMAE)) { uap->dmacr |= UART011_TXDMAE; writew(uap->dmacr, @@ -1208,15 +1209,24 @@ static void pl011_stop_tx(struct uart_port *port) pl011_dma_tx_stop(uap); } +static bool pl011_tx_chars(struct uart_amba_port *uap); + +/* Start TX with programmed I/O only (no DMA) */ +static void pl011_start_tx_pio(struct uart_amba_port *uap) +{ + uap->im |= UART011_TXIM; + writew(uap->im, uap->port.membase + UART011_IMSC); + if (!uap->tx_irq_seen) + pl011_tx_chars(uap); +} + static void pl011_start_tx(struct uart_port *port) { struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port); - if (!pl011_dma_tx_start(uap)) { - uap->im |= UART011_TXIM; - writew(uap->im, uap->port.membase + UART011_IMSC); - } + if (!pl011_dma_tx_start(uap)) + pl011_start_tx_pio(uap); } static void pl011_stop_rx(struct uart_port *port) @@ -1274,40 +1284,87 @@ __acquires(&uap->port.lock) spin_lock(&uap->port.lock); } -static void pl011_tx_chars(struct uart_amba_port *uap) +/* + * Transmit a character + * There must be at least one free entry in the TX FIFO to accept the char. + * + * Returns true if the FIFO might have space in it afterwards; + * returns false if the FIFO definitely became full. + */ +static bool pl011_tx_char(struct uart_amba_port *uap, unsigned char c) +{ + writew(c, uap->port.membase + UART01x_DR); + uap->port.icount.tx++; + + if (likely(uap->tx_irq_seen > 1)) + return true; + + return !(readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF); +} + +static bool pl011_tx_chars(struct uart_amba_port *uap) { struct circ_buf *xmit = &uap->port.state->xmit; int count; + if (unlikely(uap->tx_irq_seen < 2)) + /* + * Initial FIFO fill level unknown: we must check TXFF + * after each write, so just try to fill up the FIFO. + */ + count = uap->fifosize; + else /* tx_irq_seen >= 2 */ + /* + * FIFO initially at least half-empty, so we can simply + * write half the FIFO without polling TXFF. + + * Note: the *first* TX IRQ can still race with + * pl011_start_tx_pio(), which can result in the FIFO + * being fuller than expected in that case. + */ + count = uap->fifosize >> 1; + + /* + * If the FIFO is full we're guaranteed a TX IRQ at some later point, + * and can't transmit immediately in any case: + */ + if (unlikely(uap->tx_irq_seen < 2 && + readw(uap->port.membase + UART01x_FR) & UART01x_FR_TXFF)) + return false; + if (uap->port.x_char) { - writew(uap->port.x_char, uap->port.membase + UART01x_DR); - uap->port.icount.tx++; + pl011_tx_char(uap, uap->port.x_char); uap->port.x_char = 0; - return; + --count; } if (uart_circ_empty(xmit) || uart_tx_stopped(&uap->port)) { pl011_stop_tx(&uap->port); - return; + goto done; } /* If we are using DMA mode, try to send some characters. */ if (pl011_dma_tx_irq(uap)) - return; + goto done; - count = uap->fifosize >> 1; - do { - writew(xmit->buf[xmit->tail], uap->port.membase + UART01x_DR); + while (count-- > 0 && pl011_tx_char(uap, xmit->buf[xmit->tail])) { xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); - uap->port.icount.tx++; if (uart_circ_empty(xmit)) break; - } while (--count > 0); + } if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) uart_write_wakeup(&uap->port); - if (uart_circ_empty(xmit)) + if (uart_circ_empty(xmit)) { pl011_stop_tx(&uap->port); + goto done; + } + + if (unlikely(!uap->tx_irq_seen)) + schedule_delayed_work(&uap->tx_softirq_work, uap->port.timeout); + +done: + return false; } static void pl011_modem_status(struct uart_amba_port *uap) @@ -1334,6 +1391,28 @@ static void pl011_modem_status(struct uart_amba_port *uap) wake_up_interruptible(&uap->port.state->port.delta_msr_wait); } +static void pl011_tx_softirq(struct work_struct *work) +{ + struct delayed_work *dwork = to_delayed_work(work); + struct uart_amba_port *uap = + container_of(dwork, struct uart_amba_port, tx_softirq_work); + + spin_lock(&uap->port.lock); + while (pl011_tx_chars(uap)) ; + spin_unlock(&uap->port.lock); +} + +static void pl011_tx_irq_seen(struct uart_amba_port *uap) +{ + if (likely(uap->tx_irq_seen > 1)) + return; + + uap->tx_irq_seen++; + if (uap->tx_irq_seen < 2) + /* first TX IRQ */ + cancel_delayed_work(&uap->tx_softirq_work); +} + static irqreturn_t pl011_int(int irq, void *dev_id) { struct uart_amba_port *uap = dev_id; @@ -1372,8 +1451,10 @@ static irqreturn_t pl011_int(int irq, void *dev_id) if (status & (UART011_DSRMIS|UART011_DCDMIS| UART011_CTSMIS|UART011_RIMIS)) pl011_modem_status(uap); - if (status & UART011_TXIS) + if (status & UART011_TXIS) { + pl011_tx_irq_seen(uap); pl011_tx_chars(uap); + } if (pass_counter-- == 0) break; @@ -1577,7 +1658,7 @@ static int pl011_startup(struct uart_port *port) { struct uart_amba_port *uap = container_of(port, struct uart_amba_port, port); - unsigned int cr, lcr_h, fbrd, ibrd; + unsigned int cr; int retval; retval = pl011_hwinit(port); @@ -1595,29 +1676,10 @@ static int pl011_startup(struct uart_port *port) writew(uap->vendor->ifls, uap->port.membase + UART011_IFLS); - /* - * Provoke TX FIFO interrupt into asserting. Taking care to preserve - * baud rate and data format specified by FBRD, IBRD and LCRH as the - * UART may already be in use as a console. - */ - spin_lock_irq(&uap->port.lock); - - fbrd = readw(uap->port.membase + UART011_FBRD); - ibrd = readw(uap->port.membase + UART011_IBRD); - lcr_h = readw(uap->port.membase + uap->lcrh_rx); - - cr = UART01x_CR_UARTEN | UART011_CR_TXE | UART011_CR_LBE; - writew(cr, uap->port.membase + UART011_CR); - writew(0, uap->port.membase + UART011_FBRD); - writew(1, uap->port.membase + UART011_IBRD); - pl011_write_lcr_h(uap, 0); - writew(0, uap->port.membase + UART01x_DR); - while (readw(uap->port.membase + UART01x_FR) & UART01x_FR_BUSY) - barrier(); + /* Assume that TX IRQ doesn't work until we see one: */ + uap->tx_irq_seen = 0; - writew(fbrd, uap->port.membase + UART011_FBRD); - writew(ibrd, uap->port.membase + UART011_IBRD); - pl011_write_lcr_h(uap, lcr_h); + spin_lock_irq(&uap->port.lock); /* restore RTS and DTR */ cr = uap->old_cr & (UART011_CR_RTS | UART011_CR_DTR); @@ -1672,6 +1734,8 @@ static void pl011_shutdown(struct uart_port *port) container_of(port, struct uart_amba_port, port); unsigned int cr; + cancel_delayed_work_sync(&uap->tx_softirq_work); + /* * disable all interrupts */ @@ -2218,6 +2282,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) uap->port.ops = &amba_pl011_pops; uap->port.flags = UPF_BOOT_AUTOCONF; uap->port.line = i; + INIT_DELAYED_WORK(&uap->tx_softirq_work, pl011_tx_softirq); pl011_dma_probe(&dev->dev, uap); /* Ensure interrupts from this UART are masked and cleared */ -- cgit From f2ee6dfa0e8597eea8b98d240b0033994e20d215 Mon Sep 17 00:00:00 2001 From: Dave Martin Date: Wed, 4 Mar 2015 12:27:34 +0000 Subject: serial/amba-pl011: Leave the TX IRQ alone when the UART is not open Getting the TX IRQ re-asserted from scratch can be inefficient in some setups. This patch avoids clearing the TX IRQ across pl011_shutdown()... pl011_startup(), so that if the port is closed and reopened, the IRQ will still work afterwards without having to bootstrap it again. The TX IRQ continues to be masked in IMSC when the UART is not in use. Signed-off-by: Dave Martin Tested-by: Andre Przywara Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/amba-pl011.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 69910f7e3991..92783fc8a851 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -1676,9 +1676,6 @@ static int pl011_startup(struct uart_port *port) writew(uap->vendor->ifls, uap->port.membase + UART011_IFLS); - /* Assume that TX IRQ doesn't work until we see one: */ - uap->tx_irq_seen = 0; - spin_lock_irq(&uap->port.lock); /* restore RTS and DTR */ @@ -1742,7 +1739,7 @@ static void pl011_shutdown(struct uart_port *port) spin_lock_irq(&uap->port.lock); uap->im = 0; writew(uap->im, uap->port.membase + UART011_IMSC); - writew(0xffff, uap->port.membase + UART011_ICR); + writew(0xffff & ~UART011_TXIS, uap->port.membase + UART011_ICR); spin_unlock_irq(&uap->port.lock); pl011_dma_shutdown(uap); -- cgit From 1c9be31015747b0a981804438b269cfb0f49aa8a Mon Sep 17 00:00:00 2001 From: Jorge Ramirez-Ortiz Date: Fri, 6 Mar 2015 13:05:40 -0500 Subject: drivers/tty: amba: defer DMA probe until the DMA channel is required. Fix a race condition that happens when device_initcall(pl011_dma_initicall) is executed before all the devices have been probed - this issue was observed on a hisi_6220 SoC (HiKey board from Linaro). The deferred driver probing framework relies on late_initcall to trigger deferred probes so it is just possible that, even with a valid DMA driver ready to be loaded, we fail to synchronize with it. The proposed implementation delays probing the DMA until dma_startup. As this is invoked on port startup and port resume - but DMA probing is only required once - we avoid calling multiple times using a new field in uart_amba_port to track this scenario. This commit allows for subsequent attempts to associate an external DMA if the DMA driver itself is not available (but present in the deferred probe pending list). Signed-off-by: Jorge Ramirez-Ortiz Reviewed-by: Rob Herring Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/amba-pl011.c | 71 ++++++++++------------------------------- 1 file changed, 17 insertions(+), 54 deletions(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 92783fc8a851..7b428e7652c5 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -167,6 +167,7 @@ struct uart_amba_port { bool using_rx_dma; struct pl011_dmarx_data dmarx; struct pl011_dmatx_data dmatx; + bool dma_probed; #endif }; @@ -264,10 +265,11 @@ static void pl011_sgbuf_free(struct dma_chan *chan, struct pl011_sgbuf *sg, } } -static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port *uap) +static void pl011_dma_probe(struct uart_amba_port *uap) { /* DMA is the sole user of the platform data right now */ struct amba_pl011_data *plat = dev_get_platdata(uap->port.dev); + struct device *dev = uap->port.dev; struct dma_slave_config tx_conf = { .dst_addr = uap->port.mapbase + UART01x_DR, .dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE, @@ -278,9 +280,15 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port * struct dma_chan *chan; dma_cap_mask_t mask; - chan = dma_request_slave_channel(dev, "tx"); + uap->dma_probed = true; + chan = dma_request_slave_channel_reason(dev, "tx"); + if (IS_ERR(chan)) { + if (PTR_ERR(chan) == -EPROBE_DEFER) { + dev_info(uap->port.dev, "DMA driver not ready\n"); + uap->dma_probed = false; + return; + } - if (!chan) { /* We need platform data */ if (!plat || !plat->dma_filter) { dev_info(uap->port.dev, "no DMA platform data\n"); @@ -388,55 +396,8 @@ static void pl011_dma_probe_initcall(struct device *dev, struct uart_amba_port * } } -#ifndef MODULE -/* - * Stack up the UARTs and let the above initcall be done at device - * initcall time, because the serial driver is called as an arch - * initcall, and at this time the DMA subsystem is not yet registered. - * At this point the driver will switch over to using DMA where desired. - */ -struct dma_uap { - struct list_head node; - struct uart_amba_port *uap; - struct device *dev; -}; - -static LIST_HEAD(pl011_dma_uarts); - -static int __init pl011_dma_initcall(void) -{ - struct list_head *node, *tmp; - - list_for_each_safe(node, tmp, &pl011_dma_uarts) { - struct dma_uap *dmau = list_entry(node, struct dma_uap, node); - pl011_dma_probe_initcall(dmau->dev, dmau->uap); - list_del(node); - kfree(dmau); - } - return 0; -} - -device_initcall(pl011_dma_initcall); - -static void pl011_dma_probe(struct device *dev, struct uart_amba_port *uap) -{ - struct dma_uap *dmau = kzalloc(sizeof(struct dma_uap), GFP_KERNEL); - if (dmau) { - dmau->uap = uap; - dmau->dev = dev; - list_add_tail(&dmau->node, &pl011_dma_uarts); - } -} -#else -static void pl011_dma_probe(struct device *dev, struct uart_amba_port *uap) -{ - pl011_dma_probe_initcall(dev, uap); -} -#endif - static void pl011_dma_remove(struct uart_amba_port *uap) { - /* TODO: remove the initcall if it has not yet executed */ if (uap->dmatx.chan) dma_release_channel(uap->dmatx.chan); if (uap->dmarx.chan) @@ -1022,6 +983,9 @@ static void pl011_dma_startup(struct uart_amba_port *uap) { int ret; + if (!uap->dma_probed) + pl011_dma_probe(uap); + if (!uap->dmatx.chan) return; @@ -1143,7 +1107,7 @@ static inline bool pl011_dma_rx_running(struct uart_amba_port *uap) #else /* Blank functions if the DMA engine is not available */ -static inline void pl011_dma_probe(struct device *dev, struct uart_amba_port *uap) +static inline void pl011_dma_probe(struct uart_amba_port *uap) { } @@ -2280,7 +2244,6 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) uap->port.flags = UPF_BOOT_AUTOCONF; uap->port.line = i; INIT_DELAYED_WORK(&uap->tx_softirq_work, pl011_tx_softirq); - pl011_dma_probe(&dev->dev, uap); /* Ensure interrupts from this UART are masked and cleared */ writew(0, uap->port.membase + UART011_IMSC); @@ -2295,7 +2258,8 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) if (!amba_reg.state) { ret = uart_register_driver(&amba_reg); if (ret < 0) { - pr_err("Failed to register AMBA-PL011 driver\n"); + dev_err(&dev->dev, + "Failed to register AMBA-PL011 driver\n"); return ret; } } @@ -2304,7 +2268,6 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) if (ret) { amba_ports[i] = NULL; uart_unregister_driver(&amba_reg); - pl011_dma_remove(uap); } return ret; -- cgit From 2c2770541040318fa6ac0ac4424d8af6dd0709bf Mon Sep 17 00:00:00 2001 From: Leilei Zhao Date: Fri, 27 Feb 2015 16:07:14 +0800 Subject: tty/serial: at91: correct check of buf used in DMA We only use buf of ring In DMA rx function while using buf of xmit in DMA tx function. So in DMA rx we need definitively to check the buf of ring which is corresponding to DMA rx function. And use macro PAGE_ALIGNED to simplify the expression. Signed-off-by: Leilei Zhao Acked-by: Nicolas Ferre Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 4031dc367d3b..1a1d255baab5 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -848,7 +848,7 @@ static int atmel_prepare_tx_dma(struct uart_port *port) spin_lock_init(&atmel_port->lock_tx); sg_init_table(&atmel_port->sg_tx, 1); /* UART circular tx buffer is an aligned page. */ - BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK); + BUG_ON(!PAGE_ALIGNED(port->state->xmit.buf)); sg_set_page(&atmel_port->sg_tx, virt_to_page(port->state->xmit.buf), UART_XMIT_SIZE, @@ -1027,7 +1027,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port) spin_lock_init(&atmel_port->lock_rx); sg_init_table(&atmel_port->sg_rx, 1); /* UART circular rx buffer is an aligned page. */ - BUG_ON((int)port->state->xmit.buf & ~PAGE_MASK); + BUG_ON(!PAGE_ALIGNED(ring->buf)); sg_set_page(&atmel_port->sg_rx, virt_to_page(ring->buf), ATMEL_SERIAL_RINGSIZE, -- cgit From a510880f6ea00ee28f22ec61a3c53357bb1bbaa5 Mon Sep 17 00:00:00 2001 From: Leilei Zhao Date: Fri, 27 Feb 2015 16:07:15 +0800 Subject: tty/serial: at91: correct buffer size used in DMA The buffer size set in DMA is inconsistent with its allocation. So keep them consistent here. The structure atmel_uart_char is used in PIO mode with its meaning. But here in DMA, all of the buffer is treated as general char. Signed-off-by: Leilei Zhao Acked-by: Nicolas Ferre Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 1a1d255baab5..6b70ec6d1704 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1030,7 +1030,7 @@ static int atmel_prepare_rx_dma(struct uart_port *port) BUG_ON(!PAGE_ALIGNED(ring->buf)); sg_set_page(&atmel_port->sg_rx, virt_to_page(ring->buf), - ATMEL_SERIAL_RINGSIZE, + sizeof(struct atmel_uart_char) * ATMEL_SERIAL_RINGSIZE, (int)ring->buf & ~PAGE_MASK); nent = dma_map_sg(port->dev, &atmel_port->sg_rx, -- cgit From 4a1e8888675b81d8f118b11650084c5e242be4b7 Mon Sep 17 00:00:00 2001 From: Leilei Zhao Date: Fri, 27 Feb 2015 16:07:16 +0800 Subject: tty/serial: at91: revise the return type of atmel_init_property The function of atmel_init_property is to set the work manner of atmel serial ports according to the property in device trees. If DMA or PDC is not set or something goes wrong in getting property, the work manner will switch to general PIO mode, thus there will not be any failure case in this function. It's actually a procedure. So changing the return type from int to void. Signed-off-by: Leilei Zhao Acked-by: Nicolas Ferre Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 6b70ec6d1704..a9b268841bb8 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1534,7 +1534,7 @@ static void atmel_tasklet_func(unsigned long data) spin_unlock(&port->lock); } -static int atmel_init_property(struct atmel_uart_port *atmel_port, +static void atmel_init_property(struct atmel_uart_port *atmel_port, struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; @@ -1575,7 +1575,6 @@ static int atmel_init_property(struct atmel_uart_port *atmel_port, atmel_port->use_dma_tx = false; } - return 0; } static void atmel_init_rs485(struct uart_port *port, @@ -2235,8 +2234,8 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port, struct uart_port *port = &atmel_port->uart; struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev); - if (!atmel_init_property(atmel_port, pdev)) - atmel_set_ops(port); + atmel_init_property(atmel_port, pdev); + atmel_set_ops(port); atmel_init_rs485(port, pdev); -- cgit From 4d9628a1486658b83e47ad4c7ff07ff1ff0d3d89 Mon Sep 17 00:00:00 2001 From: Leilei Zhao Date: Fri, 27 Feb 2015 16:07:17 +0800 Subject: tty/serial: at91: set ops in property init each time The property in device tree will be reading each time when tty is opened, so the ops of serial port should be set after that instead of setting once in probe. Otherwise, the ops of serial port is inconsistent with the state of serial work manner. For example, the atmel serial driver can't work when switching to PIO mode due to DMA channel is not available. Signed-off-by: Leilei Zhao Acked-by: Nicolas Ferre Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index a9b268841bb8..8fac877bc3d4 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1759,6 +1759,7 @@ static int atmel_startup(struct uart_port *port) * Initialize DMA (if necessary) */ atmel_init_property(atmel_port, pdev); + atmel_set_ops(port); if (atmel_port->prepare_rx) { retval = atmel_port->prepare_rx(port); -- cgit From 1e1257860fd10487795b782f1dbb5b5f2c203474 Mon Sep 17 00:00:00 2001 From: Leilei Zhao Date: Fri, 27 Feb 2015 16:07:18 +0800 Subject: tty/serial: at91: correct the usage of tasklet The tasklet may be scheduled and executed after serial port was shutdown, for example, DMA rx callback will schedule the tasklet while serial port is shutting down, especially serial port is sending and receiving data in a higher baud rate and it's killed by external program. In this case, tasklet_kill can only clear the current scheduling out, so tasklet should be disabled to prevent being executed in later scheduling. Otherwise, the tasklet executed after serial port was shutdown can lead to kernel crash. Signed-off-by: Leilei Zhao Acked-by: Nicolas Ferre Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 8fac877bc3d4..b45a4809031e 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -1755,6 +1755,8 @@ static int atmel_startup(struct uart_port *port) if (retval) goto free_irq; + tasklet_enable(&atmel_port->tasklet); + /* * Initialize DMA (if necessary) */ @@ -1858,6 +1860,7 @@ static void atmel_shutdown(struct uart_port *port) * Clear out any scheduled tasklets before * we destroy the buffers */ + tasklet_disable(&atmel_port->tasklet); tasklet_kill(&atmel_port->tasklet); /* @@ -2251,6 +2254,7 @@ static int atmel_init_port(struct atmel_uart_port *atmel_port, tasklet_init(&atmel_port->tasklet, atmel_tasklet_func, (unsigned long)port); + tasklet_disable(&atmel_port->tasklet); memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring)); -- cgit From 73abaf87f01be6fa6da3c0aa9c138a1b6b281068 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sun, 1 Mar 2015 11:05:46 -0500 Subject: serial: earlycon: Refactor parse_options into serial core Prepare to support console-defined matching; refactor the command line parameter string processing from parse_options() into a new core function, uart_parse_earlycon(), which decodes command line parameters of the form: earlycon=,io|mmio|mmio32,, console=,io|mmio|mmio32,, earlycon=,0x, console=,0x, Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/earlycon.c | 39 ++++++++++++---------------------- drivers/tty/serial/serial_core.c | 46 ++++++++++++++++++++++++++++++++++++++++ include/linux/serial_core.h | 2 ++ 3 files changed, 61 insertions(+), 26 deletions(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 64fe25a4285c..58d6bcdaf31c 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -54,44 +54,31 @@ static void __iomem * __init earlycon_map(unsigned long paddr, size_t size) return base; } -static int __init parse_options(struct earlycon_device *device, - char *options) +static int __init parse_options(struct earlycon_device *device, char *options) { struct uart_port *port = &device->port; - int mmio, mmio32, length; + int length; unsigned long addr; - if (!options) - return -ENODEV; + if (uart_parse_earlycon(options, &port->iotype, &addr, &options)) + return -EINVAL; - mmio = !strncmp(options, "mmio,", 5); - mmio32 = !strncmp(options, "mmio32,", 7); - if (mmio || mmio32) { - port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32); - options += mmio ? 5 : 7; - addr = simple_strtoul(options, NULL, 0); + switch (port->iotype) { + case UPIO_MEM32: + port->regshift = 2; /* fall-through */ + case UPIO_MEM: port->mapbase = addr; - if (mmio32) - port->regshift = 2; - } else if (!strncmp(options, "io,", 3)) { - port->iotype = UPIO_PORT; - options += 3; - addr = simple_strtoul(options, NULL, 0); + break; + case UPIO_PORT: port->iobase = addr; - mmio = 0; - } else if (!strncmp(options, "0x", 2)) { - port->iotype = UPIO_MEM; - addr = simple_strtoul(options, NULL, 0); - port->mapbase = addr; - } else { + break; + default: return -EINVAL; } port->uartclk = BASE_BAUD * 16; - options = strchr(options, ','); if (options) { - options++; device->baud = simple_strtoul(options, NULL, 0); length = min(strcspn(options, " ") + 1, (size_t)(sizeof(device->options))); @@ -100,7 +87,7 @@ static int __init parse_options(struct earlycon_device *device, if (port->iotype == UPIO_MEM || port->iotype == UPIO_MEM32) pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n", - mmio32 ? "32" : "", + (port->iotype == UPIO_MEM32) ? "32" : "", (unsigned long long)port->mapbase, device->options); else diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 63d29473c703..8379e3fa0162 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1808,6 +1808,52 @@ uart_get_console(struct uart_port *ports, int nr, struct console *co) return ports + idx; } +/** + * uart_parse_earlycon - Parse earlycon options + * @p: ptr to 2nd field (ie., just beyond ',') + * @iotype: ptr for decoded iotype (out) + * @addr: ptr for decoded mapbase/iobase (out) + * @options: ptr for field; NULL if not present (out) + * + * Decodes earlycon kernel command line parameters of the form + * earlycon=,io|mmio|mmio32,, + * console=,io|mmio|mmio32,, + * + * The optional form + * earlycon=,0x, + * console=,0x, + * is also accepted; the returned @iotype will be UPIO_MEM. + * + * Returns 0 on success or -EINVAL on failure + */ +int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, + char **options) +{ + if (strncmp(p, "mmio,", 5) == 0) { + *iotype = UPIO_MEM; + p += 5; + } else if (strncmp(p, "mmio32,", 7) == 0) { + *iotype = UPIO_MEM32; + p += 7; + } else if (strncmp(p, "io,", 3) == 0) { + *iotype = UPIO_PORT; + p += 3; + } else if (strncmp(p, "0x", 2) == 0) { + *iotype = UPIO_MEM; + } else { + return -EINVAL; + } + + *addr = simple_strtoul(p, NULL, 0); + p = strchr(p, ','); + if (p) + p++; + + *options = p; + return 0; +} +EXPORT_SYMBOL_GPL(uart_parse_earlycon); + /** * uart_parse_options - Parse serial port baud/parity/bits/flow control. * @options: pointer to option string diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index baf3e1d08416..cc5c506f07dd 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -354,6 +354,8 @@ early_param("earlycon", name ## _setup_earlycon); struct uart_port *uart_get_console(struct uart_port *ports, int nr, struct console *c); +int uart_parse_earlycon(char *p, unsigned char *iotype, unsigned long *addr, + char **options); void uart_parse_options(char *options, int *baud, int *parity, int *bits, int *flow); int uart_set_options(struct uart_port *port, struct console *co, int baud, -- cgit From f427c990e2d0fd30336b0c252aa7e38e4cffdea2 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Sun, 1 Mar 2015 11:05:47 -0500 Subject: console: Preserve index after console setup() Before register_console() calls the setup() method of the matched console, the registering console index is already equal to the index from the console command line; ie. newcon->index == c->index. This change is also required to support extensible console matching; (the command line index may have no relation to the console index assigned by the console-defined match() function). Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- kernel/printk/printk.c | 1 - 1 file changed, 1 deletion(-) diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 01cfd69c54c6..d261a7e5f51a 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2479,7 +2479,6 @@ void register_console(struct console *newcon) newcon->setup(newcon, console_cmdline[i].options) != 0) break; newcon->flags |= CON_ENABLED; - newcon->index = c->index; if (i == selected_console) { newcon->flags |= CON_CONSDEV; preferred_console = selected_console; -- cgit From 833b1f7b5191e4ac15dfd86aa8137f2349f0fc30 Mon Sep 17 00:00:00 2001 From: Alexey Brodkin Date: Tue, 3 Mar 2015 18:11:14 +0300 Subject: serial/8250_dw: use platform_get_irq() instead of platform_get_resource() It is not recommened to use platform_get_resource(pdev, IORESOURCE_IRQ) for requesting IRQ's resources any more, as they can be not ready yet in case of DT-booting. platform_get_irq() instead is a recommended way for getting IRQ even if it was not retrieved earlier. It also makes code simpler because we're getting "int" value right away and no conversion from resource to int is required. Signed-off-by: Alexey Brodkin Cc: Vineet Gupta Cc: Alan Cox Cc: Greg Kroah-Hartman Cc: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index f426acc8c6b5..06933e8826a1 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -384,18 +384,24 @@ static int dw8250_probe(struct platform_device *pdev) { struct uart_8250_port uart = {}; struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); - struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + int irq = platform_get_irq(pdev, 0); struct dw8250_data *data; int err; - if (!regs || !irq) { - dev_err(&pdev->dev, "no registers/irq defined\n"); + if (!regs) { + dev_err(&pdev->dev, "no registers defined\n"); return -EINVAL; } + if (irq < 0) { + if (irq != -EPROBE_DEFER) + dev_err(&pdev->dev, "cannot get irq\n"); + return irq; + } + spin_lock_init(&uart.port.lock); uart.port.mapbase = regs->start; - uart.port.irq = irq->start; + uart.port.irq = irq; uart.port.handle_irq = dw8250_handle_irq; uart.port.pm = dw8250_do_pm; uart.port.type = PORT_8250; -- cgit From 4c0d9b17d1c0608bbbef6d00e68956de2c3b1f8e Mon Sep 17 00:00:00 2001 From: Nicholas Mc Guire Date: Mon, 9 Feb 2015 10:53:25 -0500 Subject: vt: vt_ioctl: use msecs_to_jiffies for time conversion Converting milliseconds to jiffies by "val * HZ / 1000" is technically OK but msecs_to_jiffies(val) is the cleaner solution and handles all corner cases correctly. This is a minor API consolidation only and should make things more readable. Signed-off-by: Nicholas Mc Guire Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt_ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/vt/vt_ioctl.c b/drivers/tty/vt/vt_ioctl.c index 2bd78e2ac8ec..97d5a74558a3 100644 --- a/drivers/tty/vt/vt_ioctl.c +++ b/drivers/tty/vt/vt_ioctl.c @@ -388,7 +388,7 @@ int vt_ioctl(struct tty_struct *tty, * Generate the tone for the appropriate number of ticks. * If the time is zero, turn off sound ourselves. */ - ticks = HZ * ((arg >> 16) & 0xffff) / 1000; + ticks = msecs_to_jiffies((arg >> 16) & 0xffff); count = ticks ? (arg & 0xffff) : 0; if (count) count = PIT_TICK_RATE / count; -- cgit From 678afb9aa8cf2002160c1a56cef5c90df6dc285e Mon Sep 17 00:00:00 2001 From: "Lad, Prabhakar" Date: Wed, 4 Feb 2015 18:18:03 +0000 Subject: tty: vt/vt: fix sparse warning this patch fixes following sparse warning: vt.c:1240:12: warning: symbol 'rgb_from_256' was not declared. Should it be static? Signed-off-by: Lad, Prabhakar Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 6e00572cbeb9..57ed647658be 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1237,7 +1237,7 @@ static void default_attr(struct vc_data *vc) struct rgb { u8 r; u8 g; u8 b; }; -struct rgb rgb_from_256(int i) +static struct rgb rgb_from_256(int i) { struct rgb c; if (i < 8) { /* Standard colours. */ -- cgit From 3372ec28622083ac87daf18918a222fbee06f6f9 Mon Sep 17 00:00:00 2001 From: Nicholas Mc Guire Date: Mon, 9 Feb 2015 10:54:10 -0500 Subject: vt: use msecs_to_jiffies for time conversion Converting milliseconds to jiffies by "val * HZ / 1000" is technically OK but msecs_to_jiffies(val) is the cleaner solution and handles all corner cases correctly. This is a minor API consolidation only and should make things more readable. Signed-off-by: Nicholas Mc Guire Reviewed-by: David Herrmann Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 57ed647658be..edf17b4e385f 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -1573,7 +1573,7 @@ static void setterm_command(struct vc_data *vc) case 11: /* set bell duration in msec */ if (vc->vc_npar >= 1) vc->vc_bell_duration = (vc->vc_par[1] < 2000) ? - vc->vc_par[1] * HZ / 1000 : 0; + msecs_to_jiffies(vc->vc_par[1]) : 0; else vc->vc_bell_duration = DEFAULT_BELL_DURATION; break; -- cgit From ac25e8c72b34ad7853aad0b7008633217af0c1df Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Tue, 10 Mar 2015 11:24:24 -0300 Subject: serial: mxs-auart: Fix build error MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 343fda95481a7254f ("serial: mxs-auart: properly handle mctrl_gpio failing") introduced the following build error: CC drivers/tty/serial/mxs-auart.o drivers/tty/serial/mxs-auart.c: In function 'mxs_auart_probe': drivers/tty/serial/mxs-auart.c:1282:3: error: unknown type name 'got' Fix it by providing a proper return code. Signed-off-by: Fabio Estevam Acked-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mxs-auart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 9abdccf5bfb2..20a863bde78d 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -1279,7 +1279,7 @@ static int mxs_auart_probe(struct platform_device *pdev) ret = mxs_auart_init_gpios(s, &pdev->dev); if (ret) { dev_err(&pdev->dev, "Failed to initialize GPIOs.\n"); - got out_free_irq; + return ret; } /* -- cgit From 13bc2bb9a0075342707e853e6dac298f0bbca111 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Tue, 10 Mar 2015 12:23:18 -0300 Subject: serial: mctrl_gpio: Fix build warnings MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Fix the following build warnings: drivers/tty/serial/serial_mctrl_gpio.c: In function 'mctrl_gpio_init': drivers/tty/serial/serial_mctrl_gpio.c:110:4: warning: return makes pointer from integer without a cast return PTR_ERR(gpios->gpio[i]); ^ /home/build/work/batch/drivers/tty/serial/serial_mctrl_gpio.c:90:6: warning: unused variable 'err' [-Wunused-variable] int err; ^ Return ERR_CAST and remove the unused 'err' variable to fix them. Fixes: 1d267ea6539f ("serial: mctrl-gpio: simplify init routine") Reported-by: Olof's autobuilder Signed-off-by: Fabio Estevam Acked-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_mctrl_gpio.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index 5027db7b5814..0ec756c62bcf 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -87,7 +87,6 @@ struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx) { struct mctrl_gpios *gpios; enum mctrl_gpio_idx i; - int err; gpios = devm_kzalloc(dev, sizeof(*gpios), GFP_KERNEL); if (!gpios) @@ -107,7 +106,7 @@ struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx) idx, flags); if (IS_ERR(gpios->gpio[i])) - return PTR_ERR(gpios->gpio[i]); + return ERR_CAST(gpios->gpio[i]); } return gpios; -- cgit From 12fe59f975b9b36a17eced4c4d33911ee9bc9f7a Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Tue, 10 Mar 2015 12:46:29 -0300 Subject: serial: imx: Add braces to avoid ambiguous 'else' MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Commit 17b8f2a3fdca29 ("serial: imx: add support for half duplex rs485") introduced the following build warning: drivers/tty/serial/imx.c: In function 'imx_set_termios': drivers/tty/serial/imx.c:1301:7: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] Add the suggested braces to avoid the build warning. Signed-off-by: Fabio Estevam Acked-by: Uwe Kleine-König Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index ddfb672d0152..c8cfa0637128 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1298,7 +1298,7 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, if (sport->have_rtscts) { ucr2 &= ~UCR2_IRTS; - if (port->rs485.flags & SER_RS485_ENABLED) + if (port->rs485.flags & SER_RS485_ENABLED) { /* * RTS is mandatory for rs485 operation, so keep * it under manual control and keep transmitter @@ -1307,9 +1307,9 @@ imx_set_termios(struct uart_port *port, struct ktermios *termios, if (!(port->rs485.flags & SER_RS485_RTS_AFTER_SEND)) ucr2 |= UCR2_CTS; - else + } else { ucr2 |= UCR2_CTSC; - + } } else { termios->c_cflag &= ~CRTSCTS; } -- cgit From 079119a2c7c83506ad753e7b95e9ed253e9963f9 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 11 Mar 2015 13:52:53 +0200 Subject: serial, x86: use UPF_* constants for flags This patch fixes the following sparse warnings: drivers/tty/serial/8250/8250_core.c:3231:32: warning: incorrect type in assignment (different base types) drivers/tty/serial/8250/8250_core.c:3231:32: expected restricted upf_t [usertype] flags drivers/tty/serial/8250/8250_core.c:3231:32: got unsigned int const [unsigned] flags Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/serial.h | 8 ++++---- drivers/tty/serial/8250/8250.h | 2 +- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/serial.h b/arch/x86/include/asm/serial.h index 460b84f64556..8378b8c9109c 100644 --- a/arch/x86/include/asm/serial.h +++ b/arch/x86/include/asm/serial.h @@ -12,11 +12,11 @@ /* Standard COM flags (except for COM4, because of the 8514 problem) */ #ifdef CONFIG_SERIAL_DETECT_IRQ -# define STD_COMX_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ) -# define STD_COM4_FLAGS (ASYNC_BOOT_AUTOCONF | 0 | ASYNC_AUTO_IRQ) +# define STD_COMX_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | UPF_AUTO_IRQ) +# define STD_COM4_FLAGS (UPF_BOOT_AUTOCONF | 0 | UPF_AUTO_IRQ) #else -# define STD_COMX_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST | 0 ) -# define STD_COM4_FLAGS (ASYNC_BOOT_AUTOCONF | 0 | 0 ) +# define STD_COMX_FLAGS (UPF_BOOT_AUTOCONF | UPF_SKIP_TEST | 0 ) +# define STD_COM4_FLAGS (UPF_BOOT_AUTOCONF | 0 | 0 ) #endif #define SERIAL_PORT_DFNS \ diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index b00836851061..656ecc60b5b2 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -53,7 +53,7 @@ struct old_serial_port { unsigned int baud_base; unsigned int port; unsigned int irq; - unsigned int flags; + upf_t flags; unsigned char hub6; unsigned char io_type; unsigned char __iomem *iomem_base; -- cgit From 48d7ff0eaacbe5a51037bdb06a8a0a729b804b5f Mon Sep 17 00:00:00 2001 From: Jorge Ramirez-Ortiz Date: Wed, 11 Mar 2015 11:20:03 -0400 Subject: drivers/tty: serial: remove info message Unacceptable levels of debug info will happen when the DMA driver defined in the DT/ACPI is a blacklisted module. Another cause for log polution would be the defer probing of the DMA driver taking too long - in which case the message that this commit removes would be cluttering the logs due to the init daemons activity. Signed-off-by: Jorge Ramirez-Ortiz Reviewed-by: Rob Herring Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/amba-pl011.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 7b428e7652c5..5a4e9d579585 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -284,7 +284,6 @@ static void pl011_dma_probe(struct uart_amba_port *uap) chan = dma_request_slave_channel_reason(dev, "tx"); if (IS_ERR(chan)) { if (PTR_ERR(chan) == -EPROBE_DEFER) { - dev_info(uap->port.dev, "DMA driver not ready\n"); uap->dma_probed = false; return; } -- cgit From da29169e769285e90bd1f8389c78b2da6e7fa910 Mon Sep 17 00:00:00 2001 From: Dmitry Torokhov Date: Mon, 9 Mar 2015 17:37:31 -0700 Subject: serial: 8250_dw: fix 'cts-override' We are dealing with CTS, not DSR here (we dealt with DSR a few lines above), so set appropriate bits. Reported-by: Kevin Cernekee Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 48a8bef058e0..c536946e4c34 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -364,9 +364,9 @@ static int dw8250_probe_of(struct uart_port *p, } if (of_property_read_bool(np, "cts-override")) { - /* Always report DSR as active */ - data->msr_mask_on |= UART_MSR_DSR; - data->msr_mask_off |= UART_MSR_DDSR; + /* Always report CTS as active */ + data->msr_mask_on |= UART_MSR_CTS; + data->msr_mask_off |= UART_MSR_DCTS; } if (of_property_read_bool(np, "ri-override")) { -- cgit From 1569039db0062c47c97ca0bf0c86210d26b8f412 Mon Sep 17 00:00:00 2001 From: Hao Liang Date: Thu, 26 Mar 2015 17:13:24 +0800 Subject: bfin uart: it will hang when read current y count if not disable dma irq Add irq disable and enable in bfin_serial_rx_dma_timeout in case of system hang. This reverts part of commit 9642dbe73c8a ("serial: bfin-uart: avoid dead lock in rx irq handler in smp kernel"). Signed-off-by: Hao Liang Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/bfin_uart.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c index 43b3e2c233ff..155781ece050 100644 --- a/drivers/tty/serial/bfin_uart.c +++ b/drivers/tty/serial/bfin_uart.c @@ -464,6 +464,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) int x_pos, pos; unsigned long flags; + dma_disable_irq_nosync(uart->rx_dma_channel); spin_lock_irqsave(&uart->rx_lock, flags); /* 2D DMA RX buffer ring is used. Because curr_y_count and @@ -496,6 +497,7 @@ void bfin_serial_rx_dma_timeout(struct bfin_serial_port *uart) } spin_unlock_irqrestore(&uart->rx_lock, flags); + dma_enable_irq(uart->rx_dma_channel); mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES); } -- cgit From 1083a7be4504df8149015894c982ebaf69766ddc Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Thu, 5 Feb 2015 11:07:42 +0100 Subject: tty: Use static attribute groups for sysfs entries Instead of manual calls of device_create_file() and device_remove_file(), pass the static attribute groups using device_create_with_groups(). Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 14 ++++++++--- drivers/tty/vt/vt.c | 70 +++++++++++++++++++++++----------------------------- 2 files changed, 41 insertions(+), 43 deletions(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 2bb4dfc02873..3949d9527e6d 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -3593,6 +3593,13 @@ static ssize_t show_cons_active(struct device *dev, } static DEVICE_ATTR(active, S_IRUGO, show_cons_active, NULL); +static struct attribute *cons_dev_attrs[] = { + &dev_attr_active.attr, + NULL +}; + +ATTRIBUTE_GROUPS(cons_dev); + static struct device *consdev; void console_sysfs_notify(void) @@ -3617,12 +3624,11 @@ int __init tty_init(void) if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) || register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0) panic("Couldn't register /dev/console driver\n"); - consdev = device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL, - "console"); + consdev = device_create_with_groups(tty_class, NULL, + MKDEV(TTYAUX_MAJOR, 1), NULL, + cons_dev_groups, "console"); if (IS_ERR(consdev)) consdev = NULL; - else - WARN_ON(device_create_file(consdev, &dev_attr_active) < 0); #ifdef CONFIG_VT vty_init(&console_fops); diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index edf17b4e385f..4a24eb2b0ede 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3041,17 +3041,24 @@ static ssize_t show_tty_active(struct device *dev, } static DEVICE_ATTR(active, S_IRUGO, show_tty_active, NULL); +static struct attribute *vt_dev_attrs[] = { + &dev_attr_active.attr, + NULL +}; + +ATTRIBUTE_GROUPS(vt_dev); + int __init vty_init(const struct file_operations *console_fops) { cdev_init(&vc0_cdev, console_fops); if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) || register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0) panic("Couldn't register /dev/tty0 driver\n"); - tty0dev = device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); + tty0dev = device_create_with_groups(tty_class, NULL, + MKDEV(TTY_MAJOR, 0), NULL, + vt_dev_groups, "tty0"); if (IS_ERR(tty0dev)) tty0dev = NULL; - else - WARN_ON(device_create_file(tty0dev, &dev_attr_active) < 0); vcs_init(); @@ -3423,42 +3430,26 @@ static ssize_t show_name(struct device *dev, struct device_attribute *attr, } -static struct device_attribute device_attrs[] = { - __ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind), - __ATTR(name, S_IRUGO, show_name, NULL), +static DEVICE_ATTR(bind, S_IRUGO|S_IWUSR, show_bind, store_bind); +static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); + +static struct attribute *con_dev_attrs[] = { + &dev_attr_bind.attr, + &dev_attr_name.attr, + NULL }; +ATTRIBUTE_GROUPS(con_dev); + static int vtconsole_init_device(struct con_driver *con) { - int i; - int error = 0; - con->flag |= CON_DRIVER_FLAG_ATTR; - dev_set_drvdata(con->dev, con); - for (i = 0; i < ARRAY_SIZE(device_attrs); i++) { - error = device_create_file(con->dev, &device_attrs[i]); - if (error) - break; - } - - if (error) { - while (--i >= 0) - device_remove_file(con->dev, &device_attrs[i]); - con->flag &= ~CON_DRIVER_FLAG_ATTR; - } - - return error; + return 0; } static void vtconsole_deinit_device(struct con_driver *con) { - int i; - - if (con->flag & CON_DRIVER_FLAG_ATTR) { - for (i = 0; i < ARRAY_SIZE(device_attrs); i++) - device_remove_file(con->dev, &device_attrs[i]); - con->flag &= ~CON_DRIVER_FLAG_ATTR; - } + con->flag &= ~CON_DRIVER_FLAG_ATTR; } /** @@ -3621,11 +3612,11 @@ static int do_register_con_driver(const struct consw *csw, int first, int last) if (retval) goto err; - con_driver->dev = device_create(vtconsole_class, NULL, - MKDEV(0, con_driver->node), - NULL, "vtcon%i", - con_driver->node); - + con_driver->dev = + device_create_with_groups(vtconsole_class, NULL, + MKDEV(0, con_driver->node), + con_driver, con_dev_groups, + "vtcon%i", con_driver->node); if (IS_ERR(con_driver->dev)) { printk(KERN_WARNING "Unable to create device for %s; " "errno = %ld\n", con_driver->desc, @@ -3739,10 +3730,11 @@ static int __init vtconsole_class_init(void) struct con_driver *con = ®istered_con_driver[i]; if (con->con && !con->dev) { - con->dev = device_create(vtconsole_class, NULL, - MKDEV(0, con->node), - NULL, "vtcon%i", - con->node); + con->dev = + device_create_with_groups(vtconsole_class, NULL, + MKDEV(0, con->node), + con, con_dev_groups, + "vtcon%i", con->node); if (IS_ERR(con->dev)) { printk(KERN_WARNING "Unable to create " -- cgit From d3157b2ca59ceb9ad1b72cad09535a343f315667 Mon Sep 17 00:00:00 2001 From: "Lad, Prabhakar" Date: Wed, 4 Feb 2015 18:23:59 +0000 Subject: tty/n_gsm: fix sparse warning this patch fixes following sparse warning: n_gsm.c:2827:22: warning: symbol 'tty_ldisc_packet' was not declared. Should it be static? Signed-off-by: Lad, Prabhakar Acked-by: Alan Cox Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_gsm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index c4343764cc5b..9546b64a7b90 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2824,7 +2824,7 @@ static int gsm_create_network(struct gsm_dlci *dlci, struct gsm_netconfig *nc) } /* Line discipline for real tty */ -struct tty_ldisc_ops tty_ldisc_packet = { +static struct tty_ldisc_ops tty_ldisc_packet = { .owner = THIS_MODULE, .magic = TTY_LDISC_MAGIC, .name = "n_gsm", -- cgit From 959801fef94b7ee66ea2c713229637a7e1770890 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:00 -0500 Subject: serial: core: Add minor field to uart_port UART drivers that share ttyS namespace cannot trivially compute the ttyS index from the port->line value since the minor_start may be offset from minor 64. Further, to do so requires a pointer to the uart driver since there is no back pointer from uart_port to uart_driver. Rather than have UART drivers computing the minor value by themselves, encapsulate within the serial core at port registration time. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_core.c | 1 + include/linux/serial_core.h | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 8379e3fa0162..a373eff44ae8 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2682,6 +2682,7 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) state->pm_state = UART_PM_STATE_UNDEFINED; uport->cons = drv->cons; + uport->minor = drv->tty_driver->minor_start + uport->line; /* * If this port is a console, then the spinlock is already diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index b0148e7bcbfa..980170e5a982 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -235,6 +235,7 @@ struct uart_port { const struct uart_ops *ops; unsigned int custom_divisor; unsigned int line; /* port index */ + unsigned int minor; resource_size_t mapbase; /* for ioremap */ struct device *dev; /* parent device */ unsigned char hub6; /* this should be in the 8250 driver */ -- cgit From 51c39814b6b23c0d7b0c47ba9236248576a164ad Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:01 -0500 Subject: serial: 8250: Compute ttyS index from port minor Prepare for 8250 split; calculate the ttyS index directly from the port minor which avoids the global serial8250_reg reference from base port operations. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 7b502c0a848f..b7f2d6c0d003 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -61,7 +61,7 @@ static struct uart_driver serial8250_reg; static int serial_index(struct uart_port *port) { - return (serial8250_reg.minor - 64) + port->line; + return port->minor - 64; } static unsigned int skip_txen_test; /* force skip of txen test at init time */ -- cgit From e6e98ceff34d398ca98b78f90966b6b90f668b68 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:02 -0500 Subject: serial: 8250: Remove duplicate ->handle_irq initialization set_io_from_upio() already initializes ->handle_irq to serial8250_default_handle_irq. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index b7f2d6c0d003..60247030785e 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3423,8 +3423,6 @@ int __init early_serial_setup(struct uart_port *port) p->serial_out = port->serial_out; if (port->handle_irq) p->handle_irq = port->handle_irq; - else - p->handle_irq = serial8250_default_handle_irq; return 0; } -- cgit From 5db496b9c808270e9e569fa721d1ecdd8f145142 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:03 -0500 Subject: serial: 8250: Simplify capabilities reset at port unregister Since uart->port.type has just reset to PORT_UNKNOWN, capabilities are reset to uart_config[PORT_UNKNOWN].flags, which is 0. Removes unnecessary dependency on uart_config[]. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 60247030785e..97bcfeab8d6e 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3747,7 +3747,7 @@ void serial8250_unregister_port(int line) uart->port.flags &= ~UPF_BOOT_AUTOCONF; uart->port.type = PORT_UNKNOWN; uart->port.dev = &serial8250_isa_devs->dev; - uart->capabilities = uart_config[uart->port.type].flags; + uart->capabilities = 0; uart_add_one_port(&serial8250_reg, &uart->port); } else { uart->port.dev = NULL; -- cgit From d81e50f6161ea169a14fbc17a94cd4943f5d8df6 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:04 -0500 Subject: serial: 8250: Move ns16550a_goto_hispeed() to local header Prepare for 8250_core.c file split; move shared inline function to local header file. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250.h | 18 +++++++++++++++++- drivers/tty/serial/8250/8250_core.c | 17 ----------------- 2 files changed, 17 insertions(+), 18 deletions(-) diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 656ecc60b5b2..23dc9f9b9839 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -21,7 +21,6 @@ struct uart_8250_dma { /* Filter function */ dma_filter_fn fn; - /* Parameter to the filter function */ void *rx_param; void *tx_param; @@ -198,3 +197,20 @@ static inline int serial8250_request_dma(struct uart_8250_port *p) } static inline void serial8250_release_dma(struct uart_8250_port *p) { } #endif + +static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) +{ + unsigned char status; + + status = serial_in(up, 0x04); /* EXCR2 */ +#define PRESL(x) ((x) & 0x30) + if (PRESL(status) == 0x10) { + /* already in high speed mode */ + return 0; + } else { + status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ + status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ + serial_out(up, 0x04, status); + } + return 1; +} diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 97bcfeab8d6e..0cf9b85901dc 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -903,23 +903,6 @@ static int broken_efr(struct uart_8250_port *up) return 0; } -static inline int ns16550a_goto_highspeed(struct uart_8250_port *up) -{ - unsigned char status; - - status = serial_in(up, 0x04); /* EXCR2 */ -#define PRESL(x) ((x) & 0x30) - if (PRESL(status) == 0x10) { - /* already in high speed mode */ - return 0; - } else { - status &= ~0xB0; /* Disable LOCK, mask out PRESL[01] */ - status |= 0x10; /* 1.625 divisor for baud_base --> 921600 */ - serial_out(up, 0x04, status); - } - return 1; -} - /* * We know that the chip has FIFOs. Does it have an EFR? The * EFR is located in the same register position as the IIR and -- cgit From e13cb72beeada6f6ac12058b9129334e3bb5ce85 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:05 -0500 Subject: serial: 8250: Decouple core from skip_txen_test module param Prepare for 8250 split; initialize the port flags based on the "skip_txen_test" module param to use the existing flag test. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 0cf9b85901dc..bd06ab790c64 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2253,7 +2253,7 @@ int serial8250_do_startup(struct uart_port *port) is variable. So, let's just don't test if we receive TX irq. This way, we'll never enable UART_BUG_TXEN. */ - if (skip_txen_test || up->port.flags & UPF_NO_TXEN_TEST) + if (up->port.flags & UPF_NO_TXEN_TEST) goto dont_test_tx_en; /* @@ -3196,6 +3196,9 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev) up->port.dev = dev; + if (skip_txen_test) + up->port.flags |= UPF_NO_TXEN_TEST; + if (up->port.flags & UPF_FIXED_TYPE) serial8250_init_fixed_type_port(up, up->port.type); @@ -3663,6 +3666,9 @@ int serial8250_register_8250_port(struct uart_8250_port *up) if (up->port.dev) uart->port.dev = up->port.dev; + if (skip_txen_test) + uart->port.flags |= UPF_NO_TXEN_TEST; + if (up->port.flags & UPF_FIXED_TYPE) serial8250_init_fixed_type_port(uart, up->port.type); @@ -3728,6 +3734,8 @@ void serial8250_unregister_port(int line) uart_remove_one_port(&serial8250_reg, &uart->port); if (serial8250_isa_devs) { uart->port.flags &= ~UPF_BOOT_AUTOCONF; + if (skip_txen_test) + uart->port.flags |= UPF_NO_TXEN_TEST; uart->port.type = PORT_UNKNOWN; uart->port.dev = &serial8250_isa_devs->dev; uart->capabilities = 0; -- cgit From c7cef0a84912cab3c9df8949b034e4aa62982ec9 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:12 -0400 Subject: console: Add extensible console matching Add match() method to struct console which allows the console to perform console command line matching instead of (or in addition to) default console matching (ie., by fixed name and index). The match() method returns 0 to indicate a successful match; normal console matching occurs if no match() method is defined or the match() method returns non-zero. The match() method is expected to set the console index if required. Re-implement earlycon-to-console-handoff with direct matching of "console=uart|uart8250,..." to the 8250 ttyS console. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 64 +++++++++++++++++++++++++++--------- drivers/tty/serial/8250/8250_early.c | 23 ------------- include/linux/console.h | 3 +- include/linux/serial_8250.h | 2 -- kernel/printk/printk.c | 52 ++++++++++------------------- 5 files changed, 67 insertions(+), 77 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index bd06ab790c64..924ee1e13828 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3322,9 +3322,54 @@ static int serial8250_console_setup(struct console *co, char *options) return uart_set_options(port, co, baud, parity, bits, flow); } -static int serial8250_console_early_setup(void) +/** + * serial8250_console_match - non-standard console matching + * @co: registering console + * @name: name from console command line + * @idx: index from console command line + * @options: ptr to option string from console command line + * + * Only attempts to match console command lines of the form: + * console=uart<>,io|mmio|mmio32,, + * console=uart<>,,options + * This form is used to register an initial earlycon boot console and + * replace it with the serial8250_console at 8250 driver init. + * + * Performs console setup for a match (as required by interface) + * + * Returns 0 if console matches; otherwise non-zero to use default matching + */ +static int serial8250_console_match(struct console *co, char *name, int idx, + char *options) { - return serial8250_find_port_for_earlycon(); + char match[] = "uart"; /* 8250-specific earlycon name */ + unsigned char iotype; + unsigned long addr; + int i; + + if (strncmp(name, match, 4) != 0) + return -ENODEV; + + if (uart_parse_earlycon(options, &iotype, &addr, &options)) + return -ENODEV; + + /* try to match the port specified on the command line */ + for (i = 0; i < nr_uarts; i++) { + struct uart_port *port = &serial8250_ports[i].port; + + if (port->iotype != iotype) + continue; + if ((iotype == UPIO_MEM || iotype == UPIO_MEM32) && + (port->mapbase != addr)) + continue; + if (iotype == UPIO_PORT && port->iobase != addr) + continue; + + co->index = i; + return serial8250_console_setup(co, options); + } + + return -ENODEV; } static struct console serial8250_console = { @@ -3332,7 +3377,7 @@ static struct console serial8250_console = { .write = serial8250_console_write, .device = uart_console_device, .setup = serial8250_console_setup, - .early_setup = serial8250_console_early_setup, + .match = serial8250_console_match, .flags = CON_PRINTBUFFER | CON_ANYTIME, .index = -1, .data = &serial8250_reg, @@ -3346,19 +3391,6 @@ static int __init serial8250_console_init(void) } console_initcall(serial8250_console_init); -int serial8250_find_port(struct uart_port *p) -{ - int line; - struct uart_port *port; - - for (line = 0; line < nr_uarts; line++) { - port = &serial8250_ports[line].port; - if (uart_match_port(p, port)) - return line; - } - return -ENODEV; -} - #define SERIAL8250_CONSOLE &serial8250_console #else #define SERIAL8250_CONSOLE NULL diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index c31a22b4f845..49bca65057e6 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -173,26 +173,3 @@ int __init setup_early_serial8250_console(char *cmdline) return setup_earlycon(cmdline, match, early_serial8250_setup); } - -int serial8250_find_port_for_earlycon(void) -{ - struct earlycon_device *device = early_device; - struct uart_port *port = device ? &device->port : NULL; - int line; - int ret; - - if (!port || (!port->membase && !port->iobase)) - return -ENODEV; - - line = serial8250_find_port(port); - if (line < 0) - return -ENODEV; - - ret = update_console_cmdline("uart", 8250, - "ttyS", line, device->options); - if (ret < 0) - ret = update_console_cmdline("uart", 0, - "ttyS", line, device->options); - - return ret; -} diff --git a/include/linux/console.h b/include/linux/console.h index 7571a16bd653..9f50fb413c11 100644 --- a/include/linux/console.h +++ b/include/linux/console.h @@ -123,7 +123,7 @@ struct console { struct tty_driver *(*device)(struct console *, int *); void (*unblank)(void); int (*setup)(struct console *, char *); - int (*early_setup)(void); + int (*match)(struct console *, char *name, int idx, char *options); short flags; short index; int cflag; @@ -141,7 +141,6 @@ extern int console_set_on_cmdline; extern struct console *early_console; extern int add_preferred_console(char *name, int idx, char *options); -extern int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options); extern void register_console(struct console *); extern int unregister_console(struct console *); extern struct console *console_drivers; diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index a8efa235b7c1..f26ae7fa30ae 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -118,8 +118,6 @@ void serial8250_resume_port(int line); extern int early_serial_setup(struct uart_port *port); -extern int serial8250_find_port(struct uart_port *p); -extern int serial8250_find_port_for_earlycon(void); extern unsigned int serial8250_early_in(struct uart_port *port, int offset); extern void serial8250_early_out(struct uart_port *port, int offset, int value); extern int setup_early_serial8250_console(char *cmdline); diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 26f899809539..dda959221086 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -2017,24 +2017,6 @@ int add_preferred_console(char *name, int idx, char *options) return __add_preferred_console(name, idx, options, NULL); } -int update_console_cmdline(char *name, int idx, char *name_new, int idx_new, char *options) -{ - struct console_cmdline *c; - int i; - - for (i = 0, c = console_cmdline; - i < MAX_CMDLINECONSOLES && c->name[0]; - i++, c++) - if (strcmp(c->name, name) == 0 && c->index == idx) { - strlcpy(c->name, name_new, sizeof(c->name)); - c->options = options; - c->index = idx_new; - return i; - } - /* not found */ - return -1; -} - bool console_suspend_enabled = true; EXPORT_SYMBOL(console_suspend_enabled); @@ -2436,9 +2418,6 @@ void register_console(struct console *newcon) if (preferred_console < 0 || bcon || !console_drivers) preferred_console = selected_console; - if (newcon->early_setup) - newcon->early_setup(); - /* * See if we want to use this console driver. If we * didn't select a console we take the first one @@ -2464,21 +2443,26 @@ void register_console(struct console *newcon) for (i = 0, c = console_cmdline; i < MAX_CMDLINECONSOLES && c->name[0]; i++, c++) { - BUILD_BUG_ON(sizeof(c->name) != sizeof(newcon->name)); - if (strcmp(c->name, newcon->name) != 0) - continue; - if (newcon->index >= 0 && - newcon->index != c->index) - continue; - if (newcon->index < 0) - newcon->index = c->index; + if (!newcon->match || + newcon->match(newcon, c->name, c->index, c->options) != 0) { + /* default matching */ + BUILD_BUG_ON(sizeof(c->name) != sizeof(newcon->name)); + if (strcmp(c->name, newcon->name) != 0) + continue; + if (newcon->index >= 0 && + newcon->index != c->index) + continue; + if (newcon->index < 0) + newcon->index = c->index; - if (_braille_register_console(newcon, c)) - return; + if (_braille_register_console(newcon, c)) + return; + + if (newcon->setup && + newcon->setup(newcon, c->options) != 0) + break; + } - if (newcon->setup && - newcon->setup(newcon, console_cmdline[i].options) != 0) - break; newcon->flags |= CON_ENABLED; if (i == selected_console) { newcon->flags |= CON_CONSDEV; -- cgit From 1cfe42b7fd299723b521b5b4bd8019a611366c5e Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:13 -0400 Subject: serial: core: Fix kernel doc for uart_console_write() '/**' is required to start a kernel-doc comment block. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/serial_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index a373eff44ae8..eb5b03be9dfd 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1765,7 +1765,7 @@ static const struct file_operations uart_proc_fops = { #endif #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL) -/* +/** * uart_console_write - write a console message to a serial port * @port: the port to write the message * @s: array of characters -- cgit From d0d654ce53ab34f9306630ebcbfc477a994ea662 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:14 -0400 Subject: serial: 8250_early: Remove early_device variable early_device was only required for serial8250_find_port_for_earlycon(), which was replaced by extensible console matching. Fixup early_serial8250_write() to get the earlycon_device * from console->data (which is initialized by {of_}setup_earlycon()). Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_early.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index 49bca65057e6..d7b831bcf367 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -36,8 +36,6 @@ #include #include -static struct earlycon_device *early_device; - unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset) { switch (port->iotype) { @@ -90,7 +88,8 @@ static void __init serial_putc(struct uart_port *port, int c) static void __init early_serial8250_write(struct console *console, const char *s, unsigned int count) { - struct uart_port *port = &early_device->port; + struct earlycon_device *device = console->data; + struct uart_port *port = &device->port; unsigned int ier; /* Save the IER and disable interrupts preserving the UUE bit */ @@ -157,7 +156,6 @@ static int __init early_serial8250_setup(struct earlycon_device *device, init_port(device); - early_device = device; device->con->write = early_serial8250_write; return 0; } -- cgit From feed5bab0d33feb5dbe5365b34d044c79f93dc6b Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:15 -0400 Subject: serial: earlycon: Move ->uartclk initialize Initializing the ->uartclk field is not related to option parsing; relocate from parse_options() to setup_earlycon() (which mirrors the behavior of of_setup_earlycon()). Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/earlycon.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 58d6bcdaf31c..0480c8f24cbb 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -76,8 +76,6 @@ static int __init parse_options(struct earlycon_device *device, char *options) return -EINVAL; } - port->uartclk = BASE_BAUD * 16; - if (options) { device->baud = simple_strtoul(options, NULL, 0); length = min(strcspn(options, " ") + 1, @@ -121,6 +119,7 @@ int __init setup_earlycon(char *buf, const char *match, if (!err) buf = NULL; + port->uartclk = BASE_BAUD * 16; if (port->mapbase) port->membase = earlycon_map(port->mapbase, 64); -- cgit From 0e3e143e5d1e7be65331cdf6d100b08bc6c15b72 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:16 -0400 Subject: serial: 8250_early: Assume uart already initialized if no baud option The option string is not supplied if the earlycon is started via devicetree and OF_EARLYCON_DECLARE(). The option string is also not required if started via kernel command line parameters of the form: earlycon=uart,mmio, console=uart,mmio, If earlycon_device->baud is 0, then an option string was not supplied. In this case, assume the uart has already been initialized by the bootloader or firmware. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_early.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index d7b831bcf367..1701d00fd9f6 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -149,12 +149,18 @@ static int __init early_serial8250_setup(struct earlycon_device *device, return 0; if (!device->baud) { + struct uart_port *port = &device->port; + unsigned int ier; + device->baud = probe_baud(&device->port); snprintf(device->options, sizeof(device->options), "%u", device->baud); - } - init_port(device); + /* assume the device was initialized, only mask interrupts */ + ier = serial8250_early_in(port, UART_IER); + serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); + } else + init_port(device); device->con->write = early_serial8250_write; return 0; -- cgit From cd385e9a2a2daa7e74003f930886e4c1cdf032f4 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:17 -0400 Subject: serial: 8250_early: Fix setup() error code If parsing failed to decode a valid uart addr, return -ENODEV instead of success. Although setup_earlycon() will detect the failure anyway (because the write() method has not been set), that behavior is not obvious and should not be relied on. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_early.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index 1701d00fd9f6..b199c10689f4 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -146,7 +146,7 @@ static int __init early_serial8250_setup(struct earlycon_device *device, const char *options) { if (!(device->port.membase || device->port.iobase)) - return 0; + return -ENODEV; if (!device->baud) { struct uart_port *port = &device->port; -- cgit From 526ebc3f56491fe971cd2b51cfc859a879e11e93 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:18 -0400 Subject: serial: earlycon: Ignore parse_options() error code Because setup_earlycon() continues to attempt console registration if an error occurred parsing the option string, the actual value of the error code from parse_options() is ignored. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/earlycon.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 0480c8f24cbb..da5e8c8c4ad4 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -114,9 +114,8 @@ int __init setup_earlycon(char *buf, const char *match, buf += len + 1; - err = parse_options(&early_console_dev, buf); /* On parsing error, pass the options buf to the setup function */ - if (!err) + if (!parse_options(&early_console_dev, buf)) buf = NULL; port->uartclk = BASE_BAUD * 16; -- cgit From 60846880384f00713c7f54243f749c1923e6c0e3 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:19 -0400 Subject: serial: earlycon: Skip parse_options() if empty string Earlycon param strings of the form earlycon= are rejected from parse_options() with an error (which, in turn, results in a NULL argument for the setup() method options parameter). Only pass non-empty string to parse_options(); this will enable handling actual parse errors differently than expected and allow formats. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/earlycon.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index da5e8c8c4ad4..025ea0140896 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -109,13 +109,16 @@ int __init setup_earlycon(char *buf, const char *match, len = strlen(match); if (strncmp(buf, match, len)) return 0; - if (buf[len] && (buf[len] != ',')) - return 0; - buf += len + 1; + if (buf[len]) { + if (buf[len] != ',') + return 0; + buf += len + 1; + } else + buf = NULL; /* On parsing error, pass the options buf to the setup function */ - if (!parse_options(&early_console_dev, buf)) + if (buf && !parse_options(&early_console_dev, buf)) buf = NULL; port->uartclk = BASE_BAUD * 16; -- cgit From 7c53cb3de493573dc3b7f2468a542a9f11cc5079 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:20 -0400 Subject: serial: earlycon: Refactor earlycon registration Separate earlycon matching from registration; add register_earlycon which initializes and registers the matched earlycon. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/earlycon.c | 42 +++++++++++++++++++++++++----------------- 1 file changed, 25 insertions(+), 17 deletions(-) diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 025ea0140896..9fb76b66c545 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -96,27 +96,13 @@ static int __init parse_options(struct earlycon_device *device, char *options) return 0; } -int __init setup_earlycon(char *buf, const char *match, - int (*setup)(struct earlycon_device *, const char *)) + +static int __init +register_earlycon(char *buf, int (*setup)(struct earlycon_device *, const char *)) { int err; - size_t len; struct uart_port *port = &early_console_dev.port; - if (!buf || !match || !setup) - return 0; - - len = strlen(match); - if (strncmp(buf, match, len)) - return 0; - - if (buf[len]) { - if (buf[len] != ',') - return 0; - buf += len + 1; - } else - buf = NULL; - /* On parsing error, pass the options buf to the setup function */ if (buf && !parse_options(&early_console_dev, buf)) buf = NULL; @@ -136,6 +122,28 @@ int __init setup_earlycon(char *buf, const char *match, return 0; } +int __init setup_earlycon(char *buf, const char *match, + int (*setup)(struct earlycon_device *, const char *)) +{ + size_t len; + + if (!buf || !match || !setup) + return 0; + + len = strlen(match); + if (strncmp(buf, match, len)) + return 0; + + if (buf[len]) { + if (buf[len] != ',') + return 0; + buf += len + 1; + } else + buf = NULL; + + return register_earlycon(buf, setup); +} + int __init of_setup_earlycon(unsigned long addr, int (*setup)(struct earlycon_device *, const char *)) { -- cgit From 470ca0de69feaba5df215ad804cec1859883a5ed Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:21 -0400 Subject: serial: earlycon: Enable earlycon without command line param Earlycon matching can only be triggered if 'earlycon=...' has been specified on the kernel command line. To workaround this limitation requires tight coupling between arches and specific serial drivers in order to start an earlycon. Devicetree avoids this limitation with a link table that contains the required data to match earlycons. Mirror this approach for earlycon match by name. Re-purpose EARLYCON_DECLARE to generate a table entry which associates name with setup() function. Re-purpose setup_earlycon() to scan this table for an earlycon match, which is registered if found. Declare one "earlycon" early_param, which calls setup_earlycon(). This design allows setup_earlycon() to be called directly with a param string (as if 'earlycon=...' had been set on the command line). Re-registration (either directly or by early_param) is prevented. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_early.c | 7 +-- drivers/tty/serial/earlycon.c | 92 ++++++++++++++++++++++++++++-------- include/asm-generic/vmlinux.lds.h | 9 ++++ include/linux/serial_core.h | 19 ++++---- 4 files changed, 94 insertions(+), 33 deletions(-) diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index b199c10689f4..d272139a5729 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -170,10 +170,5 @@ EARLYCON_DECLARE(uart, early_serial8250_setup); int __init setup_early_serial8250_console(char *cmdline) { - char match[] = "uart8250"; - - if (cmdline && cmdline[4] == ',') - match[4] = '\0'; - - return setup_earlycon(cmdline, match, early_serial8250_setup); + return setup_earlycon(cmdline); } diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c index 9fb76b66c545..5fdc9f3ecd64 100644 --- a/drivers/tty/serial/earlycon.c +++ b/drivers/tty/serial/earlycon.c @@ -10,6 +10,9 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + #include #include #include @@ -34,6 +37,10 @@ static struct earlycon_device early_console_dev = { .con = &early_con, }; +extern struct earlycon_id __earlycon_table[]; +static const struct earlycon_id __earlycon_table_sentinel + __used __section(__earlycon_table_end); + static const struct of_device_id __earlycon_of_table_sentinel __used __section(__earlycon_of_table_end); @@ -96,9 +103,7 @@ static int __init parse_options(struct earlycon_device *device, char *options) return 0; } - -static int __init -register_earlycon(char *buf, int (*setup)(struct earlycon_device *, const char *)) +static int __init register_earlycon(char *buf, const struct earlycon_id *match) { int err; struct uart_port *port = &early_console_dev.port; @@ -112,7 +117,7 @@ register_earlycon(char *buf, int (*setup)(struct earlycon_device *, const char * port->membase = earlycon_map(port->mapbase, 64); early_console_dev.con->data = &early_console_dev; - err = setup(&early_console_dev, buf); + err = match->setup(&early_console_dev, buf); if (err < 0) return err; if (!early_console_dev.con->write) @@ -122,27 +127,76 @@ register_earlycon(char *buf, int (*setup)(struct earlycon_device *, const char * return 0; } -int __init setup_earlycon(char *buf, const char *match, - int (*setup)(struct earlycon_device *, const char *)) +/** + * setup_earlycon - match and register earlycon console + * @buf: earlycon param string + * + * Registers the earlycon console matching the earlycon specified + * in the param string @buf. Acceptable param strings are of the form + * ,io|mmio|mmio32,, + * ,0x, + * , + * + * + * Only for the third form does the earlycon setup() method receive the + * string in the 'options' parameter; all other forms set + * the parameter to NULL. + * + * Returns 0 if an attempt to register the earlycon was made, + * otherwise negative error code + */ +int __init setup_earlycon(char *buf) { - size_t len; + const struct earlycon_id *match; - if (!buf || !match || !setup) - return 0; + if (!buf || !buf[0]) + return -EINVAL; - len = strlen(match); - if (strncmp(buf, match, len)) - return 0; + if (early_con.flags & CON_ENABLED) + return -EALREADY; - if (buf[len]) { - if (buf[len] != ',') - return 0; - buf += len + 1; - } else - buf = NULL; + for (match = __earlycon_table; match->name[0]; match++) { + size_t len = strlen(match->name); - return register_earlycon(buf, setup); + if (strncmp(buf, match->name, len)) + continue; + + if (buf[len]) { + if (buf[len] != ',') + continue; + buf += len + 1; + } else + buf = NULL; + + return register_earlycon(buf, match); + } + + return -ENOENT; +} + +/* early_param wrapper for setup_earlycon() */ +static int __init param_setup_earlycon(char *buf) +{ + int err; + + /* + * Just 'earlycon' is a valid param for devicetree earlycons; + * don't generate a warning from parse_early_params() in that case + */ + if (!buf || !buf[0]) + return 0; + + err = setup_earlycon(buf); + if (err == -ENOENT) { + pr_warn("no match for %s\n", buf); + err = 0; + } else if (err == -EALREADY) { + pr_warn("already registered\n"); + err = 0; + } + return err; } +early_param("earlycon", param_setup_earlycon); int __init of_setup_earlycon(unsigned long addr, int (*setup)(struct earlycon_device *, const char *)) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index ac78910d7416..87e5b6f8f4fc 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -150,6 +150,14 @@ #define TRACE_SYSCALLS() #endif +#ifdef CONFIG_SERIAL_EARLYCON +#define EARLYCON_TABLE() . = ALIGN(8); \ + VMLINUX_SYMBOL(__earlycon_table) = .; \ + *(__earlycon_table) \ + *(__earlycon_table_end) +#else +#define EARLYCON_TABLE() +#endif #define ___OF_TABLE(cfg, name) _OF_TABLE_##cfg(name) #define __OF_TABLE(cfg, name) ___OF_TABLE(cfg, name) @@ -503,6 +511,7 @@ CPU_METHOD_OF_TABLES() \ KERNEL_DTB() \ IRQCHIP_OF_MATCH_TABLE() \ + EARLYCON_TABLE() \ EARLYCON_OF_TABLES() #define INIT_TEXT \ diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 980170e5a982..8aeec4913a9c 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -337,18 +337,21 @@ struct earlycon_device { char options[16]; /* e.g., 115200n8 */ unsigned int baud; }; -int setup_earlycon(char *buf, const char *match, - int (*setup)(struct earlycon_device *, const char *)); +struct earlycon_id { + char name[16]; + int (*setup)(struct earlycon_device *, const char *options); +}; + +extern int setup_earlycon(char *buf); extern int of_setup_earlycon(unsigned long addr, int (*setup)(struct earlycon_device *, const char *)); -#define EARLYCON_DECLARE(name, func) \ -static int __init name ## _setup_earlycon(char *buf) \ -{ \ - return setup_earlycon(buf, __stringify(name), func); \ -} \ -early_param("earlycon", name ## _setup_earlycon); +#define EARLYCON_DECLARE(_name, func) \ + static const struct earlycon_id __earlycon_##_name \ + __used __section(__earlycon_table) \ + = { .name = __stringify(_name), \ + .setup = func } #define OF_EARLYCON_DECLARE(name, compat, fn) \ _OF_DECLARE(earlycon, name, compat, fn, void *) -- cgit From df519e7bd33cf56d8a5ce357dfb94248d427b688 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 16:27:22 -0400 Subject: serial: 8250_early: Remove setup_early_serial8250_console() setup_earlycon() will now match and register the desired earlycon from the param string (as if 'earlycon=...' had been set on the command line). Use setup_earlycon() from existing arch call sites which start an earlycon directly. Acked-by: Rob Herring Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- arch/mips/mti-malta/malta-init.c | 4 ++-- drivers/firmware/pcdp.c | 4 ++-- drivers/tty/serial/8250/8250_early.c | 5 ----- include/linux/serial_8250.h | 1 - 4 files changed, 4 insertions(+), 10 deletions(-) diff --git a/arch/mips/mti-malta/malta-init.c b/arch/mips/mti-malta/malta-init.c index 6849f533154f..cec3e187c48f 100644 --- a/arch/mips/mti-malta/malta-init.c +++ b/arch/mips/mti-malta/malta-init.c @@ -14,7 +14,7 @@ #include #include #include -#include +#include #include #include @@ -75,7 +75,7 @@ static void __init console_config(void) if ((strstr(fw_getcmdline(), "earlycon=")) == NULL) { sprintf(console_string, "uart8250,io,0x3f8,%d%c%c", baud, parity, bits); - setup_early_serial8250_console(console_string); + setup_earlycon(console_string); } if ((strstr(fw_getcmdline(), "console=")) == NULL) { diff --git a/drivers/firmware/pcdp.c b/drivers/firmware/pcdp.c index a330492e06f9..75273a251603 100644 --- a/drivers/firmware/pcdp.c +++ b/drivers/firmware/pcdp.c @@ -15,7 +15,7 @@ #include #include #include -#include +#include #include #include "pcdp.h" @@ -43,7 +43,7 @@ setup_serial_console(struct pcdp_uart *uart) } add_preferred_console("uart", 8250, &options[9]); - return setup_early_serial8250_console(options); + return setup_earlycon(options); #else return -ENODEV; #endif diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index d272139a5729..a2b4e58690ba 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -167,8 +167,3 @@ static int __init early_serial8250_setup(struct earlycon_device *device, } EARLYCON_DECLARE(uart8250, early_serial8250_setup); EARLYCON_DECLARE(uart, early_serial8250_setup); - -int __init setup_early_serial8250_console(char *cmdline) -{ - return setup_earlycon(cmdline); -} diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index f26ae7fa30ae..ca9f87beac63 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -120,7 +120,6 @@ extern int early_serial_setup(struct uart_port *port); extern unsigned int serial8250_early_in(struct uart_port *port, int offset); extern void serial8250_early_out(struct uart_port *port, int offset, int value); -extern int setup_early_serial8250_console(char *cmdline); extern void serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, struct ktermios *old); extern int serial8250_do_startup(struct uart_port *port); -- cgit From 6e28157173037b779fcf90715416a21a1e5ea2f9 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:06 -0500 Subject: serial: 8250: Separate 8250 console interface Prepare for 8250 core split; separate shared console interface from the console definition of the universal driver. Introduce 8250 shared console interface; serial8250_console_write() and serial8250_console_setup() which decouples the console operation from the port structure storage. Rename existing serial8250_console* identifiers to univ8250_console*. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 65 +++++++++++++++++++++++-------------- 1 file changed, 41 insertions(+), 24 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 924ee1e13828..625f81c9b55e 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3222,10 +3222,9 @@ static void serial8250_console_putchar(struct uart_port *port, int ch) * * The console_lock must be held when we get here. */ -static void -serial8250_console_write(struct console *co, const char *s, unsigned int count) +static void serial8250_console_write(struct uart_8250_port *up, const char *s, + unsigned int count) { - struct uart_8250_port *up = &serial8250_ports[co->index]; struct uart_port *port = &up->port; unsigned long flags; unsigned int ier; @@ -3297,14 +3296,35 @@ serial8250_console_write(struct console *co, const char *s, unsigned int count) serial8250_rpm_put(up); } -static int serial8250_console_setup(struct console *co, char *options) +static void univ8250_console_write(struct console *co, const char *s, + unsigned int count) +{ + struct uart_8250_port *up = &serial8250_ports[co->index]; + + serial8250_console_write(up, s, count); +} + +static int serial8250_console_setup(struct uart_8250_port *up, char *options) { - struct uart_port *port; + struct uart_port *port = &up->port; int baud = 9600; int bits = 8; int parity = 'n'; int flow = 'n'; + if (!port->iobase && !port->membase) + return -ENODEV; + + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + + return uart_set_options(port, port->cons, baud, parity, bits, flow); +} + +static int univ8250_console_setup(struct console *co, char *options) +{ + struct uart_8250_port *up; + /* * Check whether an invalid uart number has been specified, and * if so, search for the first available port that does have @@ -3312,18 +3332,15 @@ static int serial8250_console_setup(struct console *co, char *options) */ if (co->index >= nr_uarts) co->index = 0; - port = &serial8250_ports[co->index].port; - if (!port->iobase && !port->membase) - return -ENODEV; - - if (options) - uart_parse_options(options, &baud, &parity, &bits, &flow); + up = &serial8250_ports[co->index]; + /* link port to console */ + up->port.cons = co; - return uart_set_options(port, co, baud, parity, bits, flow); + return serial8250_console_setup(up, options); } /** - * serial8250_console_match - non-standard console matching + * univ8250_console_match - non-standard console matching * @co: registering console * @name: name from console command line * @idx: index from console command line @@ -3339,8 +3356,8 @@ static int serial8250_console_setup(struct console *co, char *options) * * Returns 0 if console matches; otherwise non-zero to use default matching */ -static int serial8250_console_match(struct console *co, char *name, int idx, - char *options) +static int univ8250_console_match(struct console *co, char *name, int idx, + char *options) { char match[] = "uart"; /* 8250-specific earlycon name */ unsigned char iotype; @@ -3366,32 +3383,32 @@ static int serial8250_console_match(struct console *co, char *name, int idx, continue; co->index = i; - return serial8250_console_setup(co, options); + return univ8250_console_setup(co, options); } return -ENODEV; } -static struct console serial8250_console = { +static struct console univ8250_console = { .name = "ttyS", - .write = serial8250_console_write, + .write = univ8250_console_write, .device = uart_console_device, - .setup = serial8250_console_setup, - .match = serial8250_console_match, + .setup = univ8250_console_setup, + .match = univ8250_console_match, .flags = CON_PRINTBUFFER | CON_ANYTIME, .index = -1, .data = &serial8250_reg, }; -static int __init serial8250_console_init(void) +static int __init univ8250_console_init(void) { serial8250_isa_init_ports(); - register_console(&serial8250_console); + register_console(&univ8250_console); return 0; } -console_initcall(serial8250_console_init); +console_initcall(univ8250_console_init); -#define SERIAL8250_CONSOLE &serial8250_console +#define SERIAL8250_CONSOLE &univ8250_console #else #define SERIAL8250_CONSOLE NULL #endif -- cgit From a4416cd1ac7b48988f0f41a17769d65c71ffc504 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:07 -0500 Subject: serial: 8250: Separate legacy irq handling from core port operations Prepare for 8250 split; decouple irq setup/teardown and handler from core port operations. Introduce setup_irq() and release_irq() 8250 driver methods; the 8250 core will use these methods to install and remove irq handling for the given 8250 port. Refactor irq chain linking/unlinking from 8250 core into univ8250_setup_irq()/univ8250_release_irq() for the universal 8250 driver. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 83 +++++++++++++++++++++++-------------- include/linux/serial_8250.h | 15 +++++++ 2 files changed, 68 insertions(+), 30 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 625f81c9b55e..06bb2ced2c94 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1890,6 +1890,48 @@ static void serial8250_backup_timeout(unsigned long data) jiffies + uart_poll_timeout(&up->port) + HZ / 5); } +static int univ8250_setup_irq(struct uart_8250_port *up) +{ + struct uart_port *port = &up->port; + int retval = 0; + + /* + * The above check will only give an accurate result the first time + * the port is opened so this value needs to be preserved. + */ + if (up->bugs & UART_BUG_THRE) { + pr_debug("ttyS%d - using backup timer\n", serial_index(port)); + + up->timer.function = serial8250_backup_timeout; + up->timer.data = (unsigned long)up; + mod_timer(&up->timer, jiffies + + uart_poll_timeout(port) + HZ / 5); + } + + /* + * If the "interrupt" for this port doesn't correspond with any + * hardware interrupt, we use a timer-based system. The original + * driver used to do this with IRQ0. + */ + if (!port->irq) { + up->timer.data = (unsigned long)up; + mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); + } else + retval = serial_link_irq_chain(up); + + return retval; +} + +static void univ8250_release_irq(struct uart_8250_port *up) +{ + struct uart_port *port = &up->port; + + del_timer_sync(&up->timer); + up->timer.function = serial8250_timeout; + if (port->irq) + serial_unlink_irq_chain(up); +} + static unsigned int serial8250_tx_empty(struct uart_port *port) { struct uart_8250_port *up = up_to_u8250p(port); @@ -2194,35 +2236,12 @@ int serial8250_do_startup(struct uart_port *port) if ((!(iir1 & UART_IIR_NO_INT) && (iir & UART_IIR_NO_INT)) || up->port.flags & UPF_BUG_THRE) { up->bugs |= UART_BUG_THRE; - pr_debug("ttyS%d - using backup timer\n", - serial_index(port)); } } - /* - * The above check will only give an accurate result the first time - * the port is opened so this value needs to be preserved. - */ - if (up->bugs & UART_BUG_THRE) { - up->timer.function = serial8250_backup_timeout; - up->timer.data = (unsigned long)up; - mod_timer(&up->timer, jiffies + - uart_poll_timeout(port) + HZ / 5); - } - - /* - * If the "interrupt" for this port doesn't correspond with any - * hardware interrupt, we use a timer-based system. The original - * driver used to do this with IRQ0. - */ - if (!port->irq) { - up->timer.data = (unsigned long)up; - mod_timer(&up->timer, jiffies + uart_poll_timeout(port)); - } else { - retval = serial_link_irq_chain(up); - if (retval) - goto out; - } + retval = up->ops->setup_irq(up); + if (retval) + goto out; /* * Now, initialize the UART @@ -2380,10 +2399,7 @@ void serial8250_do_shutdown(struct uart_port *port) serial_port_in(port, UART_RX); serial8250_rpm_put(up); - del_timer_sync(&up->timer); - up->timer.function = serial8250_timeout; - if (port->irq) - serial_unlink_irq_chain(up); + up->ops->release_irq(up); } EXPORT_SYMBOL_GPL(serial8250_do_shutdown); @@ -3083,6 +3099,11 @@ static struct uart_ops serial8250_pops = { #endif }; +static const struct uart_8250_ops univ8250_driver_ops = { + .setup_irq = univ8250_setup_irq, + .release_irq = univ8250_release_irq, +}; + static struct uart_8250_port serial8250_ports[UART_NR]; /** @@ -3137,6 +3158,8 @@ static void __init serial8250_isa_init_ports(void) up->timer.function = serial8250_timeout; up->cur_iotype = 0xFF; + up->ops = &univ8250_driver_ops; + /* * ALPHA_KLUDGE_MCR needs to be killed. */ diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index ca9f87beac63..50735a9ad598 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -60,6 +60,20 @@ enum { }; struct uart_8250_dma; +struct uart_8250_port; + +/** + * 8250 core driver operations + * + * @setup_irq() Setup irq handling. The universal 8250 driver links this + * port to the irq chain. Other drivers may @request_irq(). + * @release_irq() Undo irq handling. The universal 8250 driver unlinks + * the port from the irq chain. + */ +struct uart_8250_ops { + int (*setup_irq)(struct uart_8250_port *); + void (*release_irq)(struct uart_8250_port *); +}; /* * This should be used by drivers which want to register @@ -100,6 +114,7 @@ struct uart_8250_port { unsigned char msr_saved_flags; struct uart_8250_dma *dma; + const struct uart_8250_ops *ops; /* 8250 specific callbacks */ int (*dl_read)(struct uart_8250_port *); -- cgit From 0a16e2c1a6221703aa4d4942c95e37d641e87cc7 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:08 -0500 Subject: serial: 8250: Separate port initialization Prepare for 8250 split; introduce serial8250_init_port() to initialize port fields uncoupled from port structure storage. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 06bb2ced2c94..e59fd1dc1ad5 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3134,6 +3134,16 @@ void serial8250_set_isa_configurator( } EXPORT_SYMBOL(serial8250_set_isa_configurator); +static void serial8250_init_port(struct uart_8250_port *up) +{ + struct uart_port *port = &up->port; + + spin_lock_init(&port->lock); + port->ops = &serial8250_pops; + + up->cur_iotype = 0xFF; +} + static void __init serial8250_isa_init_ports(void) { struct uart_8250_port *up; @@ -3152,11 +3162,10 @@ static void __init serial8250_isa_init_ports(void) struct uart_port *port = &up->port; port->line = i; - spin_lock_init(&port->lock); + serial8250_init_port(up); init_timer(&up->timer); up->timer.function = serial8250_timeout; - up->cur_iotype = 0xFF; up->ops = &univ8250_driver_ops; @@ -3165,8 +3174,6 @@ static void __init serial8250_isa_init_ports(void) */ up->mcr_mask = ~ALPHA_KLUDGE_MCR; up->mcr_force = ALPHA_KLUDGE_MCR; - - port->ops = &serial8250_pops; } if (share_irqs) -- cgit From 1a53e07989733d72354eb9617f49377ff30588a8 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:09 -0500 Subject: serial: 8250: Encapsulate port i/o method init Prepare for 8250 split; introduce serial8250_set_defaults() to set default port methods prior to driver override. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e59fd1dc1ad5..c5db1395c348 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3144,6 +3144,13 @@ static void serial8250_init_port(struct uart_8250_port *up) up->cur_iotype = 0xFF; } +static void serial8250_set_defaults(struct uart_8250_port *up) +{ + struct uart_port *port = &up->port; + + set_io_from_upio(port); +} + static void __init serial8250_isa_init_ports(void) { struct uart_8250_port *up; @@ -3193,11 +3200,11 @@ static void __init serial8250_isa_init_ports(void) port->membase = old_serial_port[i].iomem_base; port->iotype = old_serial_port[i].io_type; port->regshift = old_serial_port[i].iomem_reg_shift; - set_io_from_upio(port); + serial8250_set_defaults(up); + port->irqflags |= irqflag; if (serial8250_isa_config != NULL) serial8250_isa_config(i, &up->port, &up->capabilities); - } } @@ -3481,7 +3488,8 @@ int __init early_serial_setup(struct uart_port *port) p->type = port->type; p->line = port->line; - set_io_from_upio(p); + serial8250_set_defaults(up_to_u8250p(p)); + if (port->serial_in) p->serial_in = port->serial_in; if (port->serial_out) @@ -3751,7 +3759,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up) if (up->port.flags & UPF_FIXED_TYPE) serial8250_init_fixed_type_port(uart, up->port.type); - set_io_from_upio(&uart->port); + serial8250_set_defaults(uart); + /* Possibly override default I/O functions. */ if (up->port.serial_in) uart->port.serial_in = up->port.serial_in; -- cgit From afd483bd0f6808d7a8891349b8a141d7abd0509d Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:10 -0500 Subject: serial: 8250: Initialize fixed type fields when setting defaults Prepare for 8250 split; move fixed type initialization into serial8250_set_defaults(). This enables uart_config[] array to remain file scope in base port operations after the split. NB: the call to serial8250_init_fixed_type_port() from serial8250_register_ports() was added by commit b5d228cc4f85 ("serial: copy UART properties of UPF_FIXED_TYPE ports provisioned using early_serial_setup") specifically to support ports initialized by early_serial_setup(). Since serial8250_set_defaults() is called from early_serial_setup(), fixed type initialization is now already handled there before serial8250_register_ports() is called. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 28 ++++++++++++---------------- 1 file changed, 12 insertions(+), 16 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index c5db1395c348..2030201daf97 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3148,6 +3148,17 @@ static void serial8250_set_defaults(struct uart_8250_port *up) { struct uart_port *port = &up->port; + if (up->port.flags & UPF_FIXED_TYPE) { + unsigned int type = up->port.type; + + if (!up->port.fifosize) + up->port.fifosize = uart_config[type].fifo_size; + if (!up->tx_loadsz) + up->tx_loadsz = uart_config[type].tx_loadsz; + if (!up->capabilities) + up->capabilities = uart_config[type].flags; + } + set_io_from_upio(port); } @@ -3208,18 +3219,6 @@ static void __init serial8250_isa_init_ports(void) } } -static void -serial8250_init_fixed_type_port(struct uart_8250_port *up, unsigned int type) -{ - up->port.type = type; - if (!up->port.fifosize) - up->port.fifosize = uart_config[type].fifo_size; - if (!up->tx_loadsz) - up->tx_loadsz = uart_config[type].tx_loadsz; - if (!up->capabilities) - up->capabilities = uart_config[type].flags; -} - static void __init serial8250_register_ports(struct uart_driver *drv, struct device *dev) { @@ -3236,9 +3235,6 @@ serial8250_register_ports(struct uart_driver *drv, struct device *dev) if (skip_txen_test) up->port.flags |= UPF_NO_TXEN_TEST; - if (up->port.flags & UPF_FIXED_TYPE) - serial8250_init_fixed_type_port(up, up->port.type); - uart_add_one_port(drv, &up->port); } } @@ -3757,7 +3753,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->port.flags |= UPF_NO_TXEN_TEST; if (up->port.flags & UPF_FIXED_TYPE) - serial8250_init_fixed_type_port(uart, up->port.type); + uart->port.type = up->port.type; serial8250_set_defaults(uart); -- cgit From d53e1428a9f1110ec865b2839f6a6f12d13da2b9 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:11 -0500 Subject: serial: 8250: Initialize default dma handlers when setting defaults Prepare for 8250 split; move default dma tx/rx handler initialization into serial8250_set_defaults(), which allows default dma ops to remain unexported from the base port operations module after the split. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 2030201daf97..423a77903cef 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3160,6 +3160,14 @@ static void serial8250_set_defaults(struct uart_8250_port *up) } set_io_from_upio(port); + + /* default dma handlers */ + if (up->dma) { + if (!up->dma->tx_dma) + up->dma->tx_dma = serial8250_tx_dma; + if (!up->dma->rx_dma) + up->dma->rx_dma = serial8250_rx_dma; + } } static void __init serial8250_isa_init_ports(void) @@ -3741,6 +3749,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->port.unthrottle = up->port.unthrottle; uart->port.rs485_config = up->port.rs485_config; uart->port.rs485 = up->port.rs485; + uart->dma = up->dma; /* Take tx_loadsz from fifosize if it wasn't set separately */ if (uart->port.fifosize && !uart->tx_loadsz) @@ -3781,13 +3790,6 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->dl_read = up->dl_read; if (up->dl_write) uart->dl_write = up->dl_write; - if (up->dma) { - uart->dma = up->dma; - if (!uart->dma->tx_dma) - uart->dma->tx_dma = serial8250_tx_dma; - if (!uart->dma->rx_dma) - uart->dma->rx_dma = serial8250_rx_dma; - } if (serial8250_isa_config != NULL) serial8250_isa_config(0, &uart->port, -- cgit From cd52b7599c1a1150719b2f6d20bce6b4f30dc8df Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:12 -0500 Subject: serial: 8250: Get RSA resource iff CONFIG_SERIAL_8250_RSA Support for Remote Supervisor Adapter is conditional on CONFIG_SERIAL_8250_RSA; only attempt RSA resource acquire if defined. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 423a77903cef..dcfe5500303f 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2797,6 +2797,7 @@ static void serial8250_release_std_resource(struct uart_8250_port *up) } } +#ifdef CONFIG_SERIAL_8250_RSA static int serial8250_request_rsa_resource(struct uart_8250_port *up) { unsigned long start = UART_RSA_BASE << up->port.regshift; @@ -2831,14 +2832,17 @@ static void serial8250_release_rsa_resource(struct uart_8250_port *up) break; } } +#endif static void serial8250_release_port(struct uart_port *port) { struct uart_8250_port *up = up_to_u8250p(port); serial8250_release_std_resource(up); +#ifdef CONFIG_SERIAL_8250_RSA if (port->type == PORT_RSA) serial8250_release_rsa_resource(up); +#endif } static int serial8250_request_port(struct uart_port *port) @@ -2850,11 +2854,13 @@ static int serial8250_request_port(struct uart_port *port) return -ENODEV; ret = serial8250_request_std_resource(up); +#ifdef CONFIG_SERIAL_8250_RSA if (ret == 0 && port->type == PORT_RSA) { ret = serial8250_request_rsa_resource(up); if (ret < 0) serial8250_release_std_resource(up); } +#endif return ret; } @@ -3016,9 +3022,11 @@ static void serial8250_config_port(struct uart_port *port, int flags) if (ret < 0) return; +#ifdef CONFIG_SERIAL_8250_RSA ret = serial8250_request_rsa_resource(up); if (ret < 0) probeflags &= ~PROBE_RSA; +#endif if (port->iotype != up->cur_iotype) set_io_from_upio(port); @@ -3037,8 +3045,10 @@ static void serial8250_config_port(struct uart_port *port, int flags) if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) autoconfig_irq(up); +#ifdef CONFIG_SERIAL_8250_RSA if (port->type != PORT_RSA && probeflags & PROBE_RSA) serial8250_release_rsa_resource(up); +#endif if (port->type == PORT_UNKNOWN) serial8250_release_std_resource(up); -- cgit From 3b81c26c92414024a8046eb216782f3d599a5d77 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:13 -0500 Subject: serial: 8250: Only get RSA resource when required The probe for Remote Supervisor Adapter is limited to port i/o addresses which match one of the probe_rsa[] module parameter addresses. Limit RSA resource acquire to matching i/o ports. The result is a saner probe policy: only perform optional probes when specified rather than by default. NB: It is possible for userspace to set the port type == PORT_RSA with ioctl(TIOCSSERIAL) and then autoconfig with ioctl(TIOCSERCONFIG), which if it fails, may leave the port type set to PORT_RSA. Since this may have previously resulted in a working RSA port, this behavior is preserved. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index dcfe5500303f..257e373bfccd 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1228,16 +1228,9 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) /* * Only probe for RSA ports if we got the region. */ - if (port->type == PORT_16550A && probeflags & PROBE_RSA) { - int i; - - for (i = 0 ; i < probe_rsa_count; ++i) { - if (probe_rsa[i] == port->iobase && __enable_rsa(up)) { - port->type = PORT_RSA; - break; - } - } - } + if (port->type == PORT_16550A && probeflags & PROBE_RSA && + __enable_rsa(up)) + port->type = PORT_RSA; #endif serial_out(up, UART_LCR, save_lcr); @@ -3008,7 +3001,7 @@ static void register_dev_spec_attr_grp(struct uart_8250_port *up) static void serial8250_config_port(struct uart_port *port, int flags) { struct uart_8250_port *up = up_to_u8250p(port); - int probeflags = PROBE_ANY; + int probeflags = 0; int ret; if (port->type == PORT_8250_CIR) @@ -3023,9 +3016,20 @@ static void serial8250_config_port(struct uart_port *port, int flags) return; #ifdef CONFIG_SERIAL_8250_RSA - ret = serial8250_request_rsa_resource(up); - if (ret < 0) - probeflags &= ~PROBE_RSA; + if (port->type == PORT_RSA) { + if (serial8250_request_rsa_resource(up) == 0) + probeflags |= PROBE_RSA; + } else if (flags & UART_CONFIG_TYPE) { + int i; + + for (i = 0 ; i < probe_rsa_count; ++i) { + if (probe_rsa[i] == port->iobase) { + if (serial8250_request_rsa_resource(up) == 0) + probeflags |= PROBE_RSA; + break; + } + } + } #endif if (port->iotype != up->cur_iotype) -- cgit From 403753937020549e4bb0d8ef6e915f00a338a096 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:14 -0500 Subject: serial: 8250: Decouple RSA probe Prepare for 8250 split; separate RSA probe and resource management from base port operations. Override base port operations for the config_port(), request_port() and release_port() methods to implement the optional RSA probe and resource management only in the universal/legacy 8250 driver. Introduce 'probe' flags for 8250 ports, which allows drivers higher up the driver stack to enable optional probes. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250.h | 3 - drivers/tty/serial/8250/8250_core.c | 112 ++++++++++++++++++++++++------------ include/linux/serial_8250.h | 2 + 3 files changed, 78 insertions(+), 39 deletions(-) diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 23dc9f9b9839..c43f74c53cd9 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -84,9 +84,6 @@ struct serial8250_config { #define UART_BUG_THRE (1 << 3) /* UART has buggy THRE reassertion */ #define UART_BUG_PARITY (1 << 4) /* UART mishandles parity if FIFO enabled */ -#define PROBE_RSA (1 << 0) -#define PROBE_ANY (~0) - #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8) #ifdef CONFIG_SERIAL_8250_SHARE_IRQ diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 257e373bfccd..a4ed84a4f8db 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -1105,7 +1105,7 @@ static void autoconfig_16550a(struct uart_8250_port *up) * whether or not this UART is a 16550A or not, since this will * determine whether or not we can use its FIFO features or not. */ -static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) +static void autoconfig(struct uart_8250_port *up) { unsigned char status1, scratch, scratch2, scratch3; unsigned char save_lcr, save_mcr; @@ -1228,7 +1228,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags) /* * Only probe for RSA ports if we got the region. */ - if (port->type == PORT_16550A && probeflags & PROBE_RSA && + if (port->type == PORT_16550A && up->probe & UART_PROBE_RSA && __enable_rsa(up)) port->type = PORT_RSA; #endif @@ -2832,10 +2832,6 @@ static void serial8250_release_port(struct uart_port *port) struct uart_8250_port *up = up_to_u8250p(port); serial8250_release_std_resource(up); -#ifdef CONFIG_SERIAL_8250_RSA - if (port->type == PORT_RSA) - serial8250_release_rsa_resource(up); -#endif } static int serial8250_request_port(struct uart_port *port) @@ -2847,13 +2843,6 @@ static int serial8250_request_port(struct uart_port *port) return -ENODEV; ret = serial8250_request_std_resource(up); -#ifdef CONFIG_SERIAL_8250_RSA - if (ret == 0 && port->type == PORT_RSA) { - ret = serial8250_request_rsa_resource(up); - if (ret < 0) - serial8250_release_std_resource(up); - } -#endif return ret; } @@ -3001,7 +2990,6 @@ static void register_dev_spec_attr_grp(struct uart_8250_port *up) static void serial8250_config_port(struct uart_port *port, int flags) { struct uart_8250_port *up = up_to_u8250p(port); - int probeflags = 0; int ret; if (port->type == PORT_8250_CIR) @@ -3015,28 +3003,11 @@ static void serial8250_config_port(struct uart_port *port, int flags) if (ret < 0) return; -#ifdef CONFIG_SERIAL_8250_RSA - if (port->type == PORT_RSA) { - if (serial8250_request_rsa_resource(up) == 0) - probeflags |= PROBE_RSA; - } else if (flags & UART_CONFIG_TYPE) { - int i; - - for (i = 0 ; i < probe_rsa_count; ++i) { - if (probe_rsa[i] == port->iobase) { - if (serial8250_request_rsa_resource(up) == 0) - probeflags |= PROBE_RSA; - break; - } - } - } -#endif - if (port->iotype != up->cur_iotype) set_io_from_upio(port); if (flags & UART_CONFIG_TYPE) - autoconfig(up, probeflags); + autoconfig(up); /* if access method is AU, it is a 16550 with a quirk */ if (port->type == PORT_16550A && port->iotype == UPIO_AU) @@ -3049,10 +3020,6 @@ static void serial8250_config_port(struct uart_port *port, int flags) if (port->type != PORT_UNKNOWN && flags & UART_CONFIG_IRQ) autoconfig_irq(up); -#ifdef CONFIG_SERIAL_8250_RSA - if (port->type != PORT_RSA && probeflags & PROBE_RSA) - serial8250_release_rsa_resource(up); -#endif if (port->type == PORT_UNKNOWN) serial8250_release_std_resource(up); @@ -3113,6 +3080,9 @@ static struct uart_ops serial8250_pops = { #endif }; +static const struct uart_ops *base_ops; +static struct uart_ops univ8250_port_ops; + static const struct uart_8250_ops univ8250_driver_ops = { .setup_irq = univ8250_setup_irq, .release_irq = univ8250_release_irq, @@ -3184,6 +3154,69 @@ static void serial8250_set_defaults(struct uart_8250_port *up) } } +#ifdef CONFIG_SERIAL_8250_RSA + +static void univ8250_config_port(struct uart_port *port, int flags) +{ + struct uart_8250_port *up = up_to_u8250p(port); + + up->probe &= ~UART_PROBE_RSA; + if (port->type == PORT_RSA) { + if (serial8250_request_rsa_resource(up) == 0) + up->probe |= UART_PROBE_RSA; + } else if (flags & UART_CONFIG_TYPE) { + int i; + + for (i = 0; i < probe_rsa_count; i++) { + if (probe_rsa[i] == up->port.iobase) { + if (serial8250_request_rsa_resource(up) == 0) + up->probe |= UART_PROBE_RSA; + break; + } + } + } + + base_ops->config_port(port, flags); + + if (port->type != PORT_RSA && up->probe & UART_PROBE_RSA) + serial8250_release_rsa_resource(up); +} + +static int univ8250_request_port(struct uart_port *port) +{ + struct uart_8250_port *up = up_to_u8250p(port); + int ret; + + ret = base_ops->request_port(port); + if (ret == 0 && port->type == PORT_RSA) { + ret = serial8250_request_rsa_resource(up); + if (ret < 0) + base_ops->release_port(port); + } + + return ret; +} + +static void univ8250_release_port(struct uart_port *port) +{ + struct uart_8250_port *up = up_to_u8250p(port); + + if (port->type == PORT_RSA) + serial8250_release_rsa_resource(up); + base_ops->release_port(port); +} + +static void univ8250_rsa_support(struct uart_ops *ops) +{ + ops->config_port = univ8250_config_port; + ops->request_port = univ8250_request_port; + ops->release_port = univ8250_release_port; +} + +#else +#define univ8250_rsa_support(x) do { } while (0) +#endif /* CONFIG_SERIAL_8250_RSA */ + static void __init serial8250_isa_init_ports(void) { struct uart_8250_port *up; @@ -3203,6 +3236,9 @@ static void __init serial8250_isa_init_ports(void) port->line = i; serial8250_init_port(up); + if (!base_ops) + base_ops = port->ops; + port->ops = &univ8250_port_ops; init_timer(&up->timer); up->timer.function = serial8250_timeout; @@ -3216,6 +3252,10 @@ static void __init serial8250_isa_init_ports(void) up->mcr_force = ALPHA_KLUDGE_MCR; } + /* chain base port ops to support Remote Supervisor Adapter */ + univ8250_port_ops = *base_ops; + univ8250_rsa_support(&univ8250_port_ops); + if (share_irqs) irqflag = IRQF_SHARED; diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index 50735a9ad598..78097e7a330a 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -102,6 +102,8 @@ struct uart_8250_port { unsigned char canary; /* non-zero during system sleep * if no_console_suspend */ + unsigned char probe; +#define UART_PROBE_RSA (1 << 0) /* * Some bits in registers are cleared on a read, so they must -- cgit From 72a33aad476f9d4b1210dbf434f53eeea84909ab Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 24 Feb 2015 14:25:15 -0500 Subject: serial: 8250: Declare base port operations const The base port operations dispatch table should never be modified at runtime; the proper way to override base port operations is to dup the port operations, modify the copy, and point port->ops at the copy. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index a4ed84a4f8db..b9f452fcb1a5 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3053,7 +3053,7 @@ serial8250_type(struct uart_port *port) return uart_config[type].name; } -static struct uart_ops serial8250_pops = { +static const struct uart_ops serial8250_pops = { .tx_empty = serial8250_tx_empty, .set_mctrl = serial8250_set_mctrl, .get_mctrl = serial8250_get_mctrl, -- cgit From 509cb7dc07cc03c28c7995a9213a605c04675a58 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 14:05:00 -0400 Subject: serial: 8250: Validate reg addr for Au1x00/RT288x i/o accessors Au1x00/RT2800+ hardware has an alternate register layout which is remapped with lookup tables by the au_serial_in()/out() i/o accessors. However, the h/w does not support the complete 8250 register set, and accesses to unmapped registers cause out-of-bounds lookups. Further, because the lookup tables are defined by designated initializers, the tables may contain unmapped entries (although the current tables do not). Declare fixed-size lookup tables with contiguous initialization for the complete 8250 register map; unmapped registers are initialized to -1. Validate the register index (ie., 'offset') is in the range [0, table size). Return fixed value for unmapped register reads and ignore unmapped register writes. Reported-by: Mason Signed-off-by: Peter Hurley Tested-by: Mans Rullgard Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 48 +++++++++++++++++++++++-------------- 1 file changed, 30 insertions(+), 18 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index b9f452fcb1a5..0a8f11b69e68 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -358,34 +358,46 @@ static void default_serial_dl_write(struct uart_8250_port *up, int value) #if defined(CONFIG_MIPS_ALCHEMY) || defined(CONFIG_SERIAL_8250_RT288X) /* Au1x00/RT288x UART hardware has a weird register layout */ -static const u8 au_io_in_map[] = { - [UART_RX] = 0, - [UART_IER] = 2, - [UART_IIR] = 3, - [UART_LCR] = 5, - [UART_MCR] = 6, - [UART_LSR] = 7, - [UART_MSR] = 8, +static const s8 au_io_in_map[8] = { + 0, /* UART_RX */ + 2, /* UART_IER */ + 3, /* UART_IIR */ + 5, /* UART_LCR */ + 6, /* UART_MCR */ + 7, /* UART_LSR */ + 8, /* UART_MSR */ + -1, /* UART_SCR (unmapped) */ }; -static const u8 au_io_out_map[] = { - [UART_TX] = 1, - [UART_IER] = 2, - [UART_FCR] = 4, - [UART_LCR] = 5, - [UART_MCR] = 6, +static const s8 au_io_out_map[8] = { + 1, /* UART_TX */ + 2, /* UART_IER */ + 4, /* UART_FCR */ + 5, /* UART_LCR */ + 6, /* UART_MCR */ + -1, /* UART_LSR (unmapped) */ + -1, /* UART_MSR (unmapped) */ + -1, /* UART_SCR (unmapped) */ }; static unsigned int au_serial_in(struct uart_port *p, int offset) { - offset = au_io_in_map[offset] << p->regshift; - return __raw_readl(p->membase + offset); + if (offset >= ARRAY_SIZE(au_io_in_map)) + return UINT_MAX; + offset = au_io_in_map[offset]; + if (offset < 0) + return UINT_MAX; + return __raw_readl(p->membase + (offset << p->regshift)); } static void au_serial_out(struct uart_port *p, int offset, int value) { - offset = au_io_out_map[offset] << p->regshift; - __raw_writel(value, p->membase + offset); + if (offset >= ARRAY_SIZE(au_io_out_map)) + return; + offset = au_io_out_map[offset]; + if (offset < 0) + return; + __raw_writel(value, p->membase + (offset << p->regshift)); } /* Au1x00 haven't got a standard divisor latch */ -- cgit From f01a0bd8921b9d6668d41fae3198970e6318f532 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 9 Mar 2015 14:05:01 -0400 Subject: serial: 8250: Check UART_SCR is writable Au1x00/RT2800+ doesn't implement the 8250 scratch register (and this may be true of other h/w currently supported by the 8250 driver); read back the canary value written to the scratch register to enable the console h/w restart after resume from system suspend. Fixes: 4516d50aabedb ("serial: 8250: Use canary to restart console ...") Reported-by: Mason Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 0a8f11b69e68..3e7cf3711378 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3585,7 +3585,8 @@ void serial8250_suspend_port(int line) port->type != PORT_8250) { unsigned char canary = 0xa5; serial_out(up, UART_SCR, canary); - up->canary = canary; + if (serial_in(up, UART_SCR) == canary) + up->canary = canary; } uart_suspend_port(&serial8250_reg, port); -- cgit From e4228d7cf5844776bfe7c1a466fc827530c0086f Mon Sep 17 00:00:00 2001 From: Wang Long Date: Mon, 9 Mar 2015 04:17:51 +0000 Subject: serial: 8250: remove the redundant include The serial_core.h file have been included in header file serial_8250.h. so remove the "#include " in some 8250 serial drivers, because they have included the header file serial_8250.h. Signed-off-by: Wang Long Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 1 - drivers/tty/serial/8250/8250_dw.c | 1 - drivers/tty/serial/8250/8250_early.c | 1 - drivers/tty/serial/8250/8250_em.c | 1 - drivers/tty/serial/8250/8250_hp300.c | 1 - drivers/tty/serial/8250/8250_omap.c | 1 - 6 files changed, 6 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 3e7cf3711378..9b2de25359d1 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -31,7 +31,6 @@ #include #include #include -#include #include #include #include diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index c536946e4c34..5a5ecf34b631 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -17,7 +17,6 @@ #include #include #include -#include #include #include #include diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index a2b4e58690ba..e95ebfe8427f 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -29,7 +29,6 @@ #include #include #include -#include #include #include #include diff --git a/drivers/tty/serial/8250/8250_em.c b/drivers/tty/serial/8250/8250_em.c index ae5eaed6aa85..0b6381214917 100644 --- a/drivers/tty/serial/8250/8250_em.c +++ b/drivers/tty/serial/8250/8250_em.c @@ -21,7 +21,6 @@ #include #include #include -#include #include #include #include diff --git a/drivers/tty/serial/8250/8250_hp300.c b/drivers/tty/serial/8250/8250_hp300.c index b4882082b247..2891958cd842 100644 --- a/drivers/tty/serial/8250/8250_hp300.c +++ b/drivers/tty/serial/8250/8250_hp300.c @@ -10,7 +10,6 @@ #include #include #include -#include #include #include #include diff --git a/drivers/tty/serial/8250/8250_omap.c b/drivers/tty/serial/8250/8250_omap.c index fe6d2e51da09..9289999cb7c6 100644 --- a/drivers/tty/serial/8250/8250_omap.c +++ b/drivers/tty/serial/8250/8250_omap.c @@ -11,7 +11,6 @@ #include #include #include -#include #include #include #include -- cgit From 77002c6f95cc2b51284f6f855da2c19e911f837a Mon Sep 17 00:00:00 2001 From: Peter Hung Date: Tue, 17 Mar 2015 18:02:14 +0800 Subject: serial: 8250_pci: remove non-used var for F81504 Remove pci_fintek_setup() non-used var with calculation ciobase Signed-off-by: Peter Hung Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 11784e9ad9c2..495da0643278 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1693,9 +1693,7 @@ static int pci_fintek_setup(struct serial_private *priv, struct uart_8250_port *port, int idx) { struct pci_dev *pdev = priv->dev; - unsigned long base; unsigned long iobase; - unsigned long ciobase = 0; u8 config_base; u32 bar_data[3]; @@ -1744,11 +1742,6 @@ static int pci_fintek_setup(struct serial_private *priv, return -EINVAL; } - if (idx < 4) { - base = pci_resource_start(priv->dev, 3); - ciobase = (int)(base + (0x8 * idx)); - } - /* Get the io address dispatch from the BIOS */ pci_read_config_dword(pdev, 0x24, &bar_data[0]); pci_read_config_dword(pdev, 0x20, &bar_data[1]); @@ -1757,8 +1750,8 @@ static int pci_fintek_setup(struct serial_private *priv, /* Calculate Real IO Port */ iobase = (bar_data[idx/4] & 0xffffffe0) + (idx % 4) * 8; - dev_dbg(&pdev->dev, "%s: idx=%d iobase=0x%lx ciobase=0x%lx config_base=0x%2x\n", - __func__, idx, iobase, ciobase, config_base); + dev_dbg(&pdev->dev, "%s: idx=%d iobase=0x%lx config_base=0x%2x\n", + __func__, idx, iobase, config_base); /* Enable UART I/O port */ pci_write_config_byte(pdev, config_base + 0x00, 0x01); -- cgit From e23407d8b3e4b3011520e5140322fddd34172173 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 13 Mar 2015 11:09:37 -0700 Subject: tty: serial: msm_serial: Remove dead code This config no longer exists now that mach-msm has been removed. Delete it and the associated code. Cc: Greg Kroah-Hartman Cc: David Brown Cc: Bryan Huntsman Cc: Daniel Walker Signed-off-by: Stephen Boyd Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/msm_serial.h | 9 --------- 2 files changed, 1 insertion(+), 10 deletions(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index c9dbc626038d..04d7a96c7cf9 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1044,7 +1044,7 @@ config SERIAL_SGI_IOC3 config SERIAL_MSM bool "MSM on-chip serial port support" - depends on ARCH_MSM || ARCH_QCOM + depends on ARCH_QCOM select SERIAL_CORE config SERIAL_MSM_CONSOLE diff --git a/drivers/tty/serial/msm_serial.h b/drivers/tty/serial/msm_serial.h index 3e1c7138d8cd..737f69fe7113 100644 --- a/drivers/tty/serial/msm_serial.h +++ b/drivers/tty/serial/msm_serial.h @@ -170,15 +170,6 @@ void msm_serial_set_mnd_regs_from_uartclk(struct uart_port *port) msm_serial_set_mnd_regs_tcxoby4(port); } -/* - * TROUT has a specific defect that makes it report it's uartclk - * as 19.2Mhz (TCXO) when it's actually 4.8Mhz (TCXO/4). This special - * cases TROUT to use the right clock. - */ -#ifdef CONFIG_MACH_TROUT -#define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_tcxoby4 -#else #define msm_serial_set_mnd_regs msm_serial_set_mnd_regs_from_uartclk -#endif #endif /* __DRIVERS_SERIAL_MSM_SERIAL_H */ -- cgit From 0fea53e255eaa889fb6cf8e10d11fbea2921eac8 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Fri, 13 Mar 2015 11:09:36 -0700 Subject: tty: serial: Remove orphaned serial driver This driver is orphaned now that mach-msm has been removed. Delete it. Cc: Greg Kroah-Hartman Cc: David Brown Cc: Bryan Huntsman Cc: Daniel Walker Signed-off-by: Stephen Boyd Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 12 - drivers/tty/serial/Makefile | 1 - drivers/tty/serial/msm_serial_hs.c | 1874 --------------------------- include/linux/platform_data/msm_serial_hs.h | 49 - 4 files changed, 1936 deletions(-) delete mode 100644 drivers/tty/serial/msm_serial_hs.c delete mode 100644 include/linux/platform_data/msm_serial_hs.h diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 04d7a96c7cf9..79ae58682adc 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1053,18 +1053,6 @@ config SERIAL_MSM_CONSOLE select SERIAL_CORE_CONSOLE select SERIAL_EARLYCON -config SERIAL_MSM_HS - tristate "MSM UART High Speed: Serial Driver" - depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50 - select SERIAL_CORE - help - If you have a machine based on MSM family of SoCs, you - can enable its onboard high speed serial port by enabling - this option. - - Choose M here to compile it as a module. The module will be - called msm_serial_hs. - config SERIAL_VT8500 bool "VIA VT8500 on-chip serial port support" depends on ARCH_VT8500 diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index f42b4f9845df..c3ac3d930b33 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -62,7 +62,6 @@ obj-$(CONFIG_SERIAL_SGI_IOC3) += ioc3_serial.o obj-$(CONFIG_SERIAL_ATMEL) += atmel_serial.o obj-$(CONFIG_SERIAL_UARTLITE) += uartlite.o obj-$(CONFIG_SERIAL_MSM) += msm_serial.o -obj-$(CONFIG_SERIAL_MSM_HS) += msm_serial_hs.o obj-$(CONFIG_SERIAL_NETX) += netx-serial.o obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o obj-$(CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL) += nwpserial.o diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c deleted file mode 100644 index 62da8534ba75..000000000000 --- a/drivers/tty/serial/msm_serial_hs.c +++ /dev/null @@ -1,1874 +0,0 @@ -/* - * MSM 7k/8k High speed uart driver - * - * Copyright (c) 2007-2011, Code Aurora Forum. All rights reserved. - * Copyright (c) 2008 Google Inc. - * Modified: Nick Pelly - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. - * See the GNU General Public License for more details. - * - * Has optional support for uart power management independent of linux - * suspend/resume: - * - * RX wakeup. - * UART wakeup can be triggered by RX activity (using a wakeup GPIO on the - * UART RX pin). This should only be used if there is not a wakeup - * GPIO on the UART CTS, and the first RX byte is known (for example, with the - * Bluetooth Texas Instruments HCILL protocol), since the first RX byte will - * always be lost. RTS will be asserted even while the UART is off in this mode - * of operation. See msm_serial_hs_platform_data.rx_wakeup_irq. - */ - -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#include -#include -#include - -/* HSUART Registers */ -#define UARTDM_MR1_ADDR 0x0 -#define UARTDM_MR2_ADDR 0x4 - -/* Data Mover result codes */ -#define RSLT_FIFO_CNTR_BMSK (0xE << 28) -#define RSLT_VLD BIT(1) - -/* write only register */ -#define UARTDM_CSR_ADDR 0x8 -#define UARTDM_CSR_115200 0xFF -#define UARTDM_CSR_57600 0xEE -#define UARTDM_CSR_38400 0xDD -#define UARTDM_CSR_28800 0xCC -#define UARTDM_CSR_19200 0xBB -#define UARTDM_CSR_14400 0xAA -#define UARTDM_CSR_9600 0x99 -#define UARTDM_CSR_7200 0x88 -#define UARTDM_CSR_4800 0x77 -#define UARTDM_CSR_3600 0x66 -#define UARTDM_CSR_2400 0x55 -#define UARTDM_CSR_1200 0x44 -#define UARTDM_CSR_600 0x33 -#define UARTDM_CSR_300 0x22 -#define UARTDM_CSR_150 0x11 -#define UARTDM_CSR_75 0x00 - -/* write only register */ -#define UARTDM_TF_ADDR 0x70 -#define UARTDM_TF2_ADDR 0x74 -#define UARTDM_TF3_ADDR 0x78 -#define UARTDM_TF4_ADDR 0x7C - -/* write only register */ -#define UARTDM_CR_ADDR 0x10 -#define UARTDM_IMR_ADDR 0x14 - -#define UARTDM_IPR_ADDR 0x18 -#define UARTDM_TFWR_ADDR 0x1c -#define UARTDM_RFWR_ADDR 0x20 -#define UARTDM_HCR_ADDR 0x24 -#define UARTDM_DMRX_ADDR 0x34 -#define UARTDM_IRDA_ADDR 0x38 -#define UARTDM_DMEN_ADDR 0x3c - -/* UART_DM_NO_CHARS_FOR_TX */ -#define UARTDM_NCF_TX_ADDR 0x40 - -#define UARTDM_BADR_ADDR 0x44 - -#define UARTDM_SIM_CFG_ADDR 0x80 -/* Read Only register */ -#define UARTDM_SR_ADDR 0x8 - -/* Read Only register */ -#define UARTDM_RF_ADDR 0x70 -#define UARTDM_RF2_ADDR 0x74 -#define UARTDM_RF3_ADDR 0x78 -#define UARTDM_RF4_ADDR 0x7C - -/* Read Only register */ -#define UARTDM_MISR_ADDR 0x10 - -/* Read Only register */ -#define UARTDM_ISR_ADDR 0x14 -#define UARTDM_RX_TOTAL_SNAP_ADDR 0x38 - -#define UARTDM_RXFS_ADDR 0x50 - -/* Register field Mask Mapping */ -#define UARTDM_SR_PAR_FRAME_BMSK BIT(5) -#define UARTDM_SR_OVERRUN_BMSK BIT(4) -#define UARTDM_SR_TXEMT_BMSK BIT(3) -#define UARTDM_SR_TXRDY_BMSK BIT(2) -#define UARTDM_SR_RXRDY_BMSK BIT(0) - -#define UARTDM_CR_TX_DISABLE_BMSK BIT(3) -#define UARTDM_CR_RX_DISABLE_BMSK BIT(1) -#define UARTDM_CR_TX_EN_BMSK BIT(2) -#define UARTDM_CR_RX_EN_BMSK BIT(0) - -/* UARTDM_CR channel_comman bit value (register field is bits 8:4) */ -#define RESET_RX 0x10 -#define RESET_TX 0x20 -#define RESET_ERROR_STATUS 0x30 -#define RESET_BREAK_INT 0x40 -#define START_BREAK 0x50 -#define STOP_BREAK 0x60 -#define RESET_CTS 0x70 -#define RESET_STALE_INT 0x80 -#define RFR_LOW 0xD0 -#define RFR_HIGH 0xE0 -#define CR_PROTECTION_EN 0x100 -#define STALE_EVENT_ENABLE 0x500 -#define STALE_EVENT_DISABLE 0x600 -#define FORCE_STALE_EVENT 0x400 -#define CLEAR_TX_READY 0x300 -#define RESET_TX_ERROR 0x800 -#define RESET_TX_DONE 0x810 - -#define UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK 0xffffff00 -#define UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK 0x3f -#define UARTDM_MR1_CTS_CTL_BMSK 0x40 -#define UARTDM_MR1_RX_RDY_CTL_BMSK 0x80 - -#define UARTDM_MR2_ERROR_MODE_BMSK 0x40 -#define UARTDM_MR2_BITS_PER_CHAR_BMSK 0x30 - -/* bits per character configuration */ -#define FIVE_BPC (0 << 4) -#define SIX_BPC (1 << 4) -#define SEVEN_BPC (2 << 4) -#define EIGHT_BPC (3 << 4) - -#define UARTDM_MR2_STOP_BIT_LEN_BMSK 0xc -#define STOP_BIT_ONE (1 << 2) -#define STOP_BIT_TWO (3 << 2) - -#define UARTDM_MR2_PARITY_MODE_BMSK 0x3 - -/* Parity configuration */ -#define NO_PARITY 0x0 -#define EVEN_PARITY 0x1 -#define ODD_PARITY 0x2 -#define SPACE_PARITY 0x3 - -#define UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK 0xffffff80 -#define UARTDM_IPR_STALE_LSB_BMSK 0x1f - -/* These can be used for both ISR and IMR register */ -#define UARTDM_ISR_TX_READY_BMSK BIT(7) -#define UARTDM_ISR_CURRENT_CTS_BMSK BIT(6) -#define UARTDM_ISR_DELTA_CTS_BMSK BIT(5) -#define UARTDM_ISR_RXLEV_BMSK BIT(4) -#define UARTDM_ISR_RXSTALE_BMSK BIT(3) -#define UARTDM_ISR_RXBREAK_BMSK BIT(2) -#define UARTDM_ISR_RXHUNT_BMSK BIT(1) -#define UARTDM_ISR_TXLEV_BMSK BIT(0) - -/* Field definitions for UART_DM_DMEN*/ -#define UARTDM_TX_DM_EN_BMSK 0x1 -#define UARTDM_RX_DM_EN_BMSK 0x2 - -#define UART_FIFOSIZE 64 -#define UARTCLK 7372800 - -/* Rx DMA request states */ -enum flush_reason { - FLUSH_NONE, - FLUSH_DATA_READY, - FLUSH_DATA_INVALID, /* values after this indicate invalid data */ - FLUSH_IGNORE = FLUSH_DATA_INVALID, - FLUSH_STOP, - FLUSH_SHUTDOWN, -}; - -/* UART clock states */ -enum msm_hs_clk_states_e { - MSM_HS_CLK_PORT_OFF, /* port not in use */ - MSM_HS_CLK_OFF, /* clock disabled */ - MSM_HS_CLK_REQUEST_OFF, /* disable after TX and RX flushed */ - MSM_HS_CLK_ON, /* clock enabled */ -}; - -/* Track the forced RXSTALE flush during clock off sequence. - * These states are only valid during MSM_HS_CLK_REQUEST_OFF */ -enum msm_hs_clk_req_off_state_e { - CLK_REQ_OFF_START, - CLK_REQ_OFF_RXSTALE_ISSUED, - CLK_REQ_OFF_FLUSH_ISSUED, - CLK_REQ_OFF_RXSTALE_FLUSHED, -}; - -/** - * struct msm_hs_tx - * @tx_ready_int_en: ok to dma more tx? - * @dma_in_flight: tx dma in progress - * @xfer: top level DMA command pointer structure - * @command_ptr: third level command struct pointer - * @command_ptr_ptr: second level command list struct pointer - * @mapped_cmd_ptr: DMA view of third level command struct - * @mapped_cmd_ptr_ptr: DMA view of second level command list struct - * @tx_count: number of bytes to transfer in DMA transfer - * @dma_base: DMA view of UART xmit buffer - * - * This structure describes a single Tx DMA transaction. MSM DMA - * commands have two levels of indirection. The top level command - * ptr points to a list of command ptr which in turn points to a - * single DMA 'command'. In our case each Tx transaction consists - * of a single second level pointer pointing to a 'box type' command. - */ -struct msm_hs_tx { - unsigned int tx_ready_int_en; - unsigned int dma_in_flight; - struct msm_dmov_cmd xfer; - dmov_box *command_ptr; - u32 *command_ptr_ptr; - dma_addr_t mapped_cmd_ptr; - dma_addr_t mapped_cmd_ptr_ptr; - int tx_count; - dma_addr_t dma_base; -}; - -/** - * struct msm_hs_rx - * @flush: Rx DMA request state - * @xfer: top level DMA command pointer structure - * @cmdptr_dmaaddr: DMA view of second level command structure - * @command_ptr: third level DMA command pointer structure - * @command_ptr_ptr: second level DMA command list pointer - * @mapped_cmd_ptr: DMA view of the third level command structure - * @wait: wait for DMA completion before shutdown - * @buffer: destination buffer for RX DMA - * @rbuffer: DMA view of buffer - * @pool: dma pool out of which coherent rx buffer is allocated - * @tty_work: private work-queue for tty flip buffer push task - * - * This structure describes a single Rx DMA transaction. Rx DMA - * transactions use box mode DMA commands. - */ -struct msm_hs_rx { - enum flush_reason flush; - struct msm_dmov_cmd xfer; - dma_addr_t cmdptr_dmaaddr; - dmov_box *command_ptr; - u32 *command_ptr_ptr; - dma_addr_t mapped_cmd_ptr; - wait_queue_head_t wait; - dma_addr_t rbuffer; - unsigned char *buffer; - struct dma_pool *pool; - struct work_struct tty_work; -}; - -/** - * struct msm_hs_rx_wakeup - * @irq: IRQ line to be configured as interrupt source on Rx activity - * @ignore: boolean value. 1 = ignore the wakeup interrupt - * @rx_to_inject: extra character to be inserted to Rx tty on wakeup - * @inject_rx: 1 = insert rx_to_inject. 0 = do not insert extra character - * - * This is an optional structure required for UART Rx GPIO IRQ based - * wakeup from low power state. UART wakeup can be triggered by RX activity - * (using a wakeup GPIO on the UART RX pin). This should only be used if - * there is not a wakeup GPIO on the UART CTS, and the first RX byte is - * known (eg., with the Bluetooth Texas Instruments HCILL protocol), - * since the first RX byte will always be lost. RTS will be asserted even - * while the UART is clocked off in this mode of operation. - */ -struct msm_hs_rx_wakeup { - int irq; /* < 0 indicates low power wakeup disabled */ - unsigned char ignore; - unsigned char inject_rx; - char rx_to_inject; -}; - -/** - * struct msm_hs_port - * @uport: embedded uart port structure - * @imr_reg: shadow value of UARTDM_IMR - * @clk: uart input clock handle - * @tx: Tx transaction related data structure - * @rx: Rx transaction related data structure - * @dma_tx_channel: Tx DMA command channel - * @dma_rx_channel Rx DMA command channel - * @dma_tx_crci: Tx channel rate control interface number - * @dma_rx_crci: Rx channel rate control interface number - * @clk_off_timer: Timer to poll DMA event completion before clock off - * @clk_off_delay: clk_off_timer poll interval - * @clk_state: overall clock state - * @clk_req_off_state: post flush clock states - * @rx_wakeup: optional rx_wakeup feature related data - * @exit_lpm_cb: optional callback to exit low power mode - * - * Low level serial port structure. - */ -struct msm_hs_port { - struct uart_port uport; - unsigned long imr_reg; - struct clk *clk; - struct msm_hs_tx tx; - struct msm_hs_rx rx; - - int dma_tx_channel; - int dma_rx_channel; - int dma_tx_crci; - int dma_rx_crci; - - struct hrtimer clk_off_timer; - ktime_t clk_off_delay; - enum msm_hs_clk_states_e clk_state; - enum msm_hs_clk_req_off_state_e clk_req_off_state; - - struct msm_hs_rx_wakeup rx_wakeup; - void (*exit_lpm_cb)(struct uart_port *); -}; - -#define MSM_UARTDM_BURST_SIZE 16 /* DM burst size (in bytes) */ -#define UARTDM_TX_BUF_SIZE UART_XMIT_SIZE -#define UARTDM_RX_BUF_SIZE 512 - -#define UARTDM_NR 2 - -static struct msm_hs_port q_uart_port[UARTDM_NR]; -static struct platform_driver msm_serial_hs_platform_driver; -static struct uart_driver msm_hs_driver; -static struct uart_ops msm_hs_ops; -static struct workqueue_struct *msm_hs_workqueue; - -#define UARTDM_TO_MSM(uart_port) \ - container_of((uart_port), struct msm_hs_port, uport) - -static unsigned int use_low_power_rx_wakeup(struct msm_hs_port - *msm_uport) -{ - return (msm_uport->rx_wakeup.irq >= 0); -} - -static unsigned int msm_hs_read(struct uart_port *uport, - unsigned int offset) -{ - return ioread32(uport->membase + offset); -} - -static void msm_hs_write(struct uart_port *uport, unsigned int offset, - unsigned int value) -{ - iowrite32(value, uport->membase + offset); -} - -static void msm_hs_release_port(struct uart_port *port) -{ - iounmap(port->membase); -} - -static int msm_hs_request_port(struct uart_port *port) -{ - port->membase = ioremap(port->mapbase, PAGE_SIZE); - if (unlikely(!port->membase)) - return -ENOMEM; - - /* configure the CR Protection to Enable */ - msm_hs_write(port, UARTDM_CR_ADDR, CR_PROTECTION_EN); - return 0; -} - -static int msm_hs_remove(struct platform_device *pdev) -{ - - struct msm_hs_port *msm_uport; - struct device *dev; - - if (pdev->id < 0 || pdev->id >= UARTDM_NR) { - printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id); - return -EINVAL; - } - - msm_uport = &q_uart_port[pdev->id]; - dev = msm_uport->uport.dev; - - dma_unmap_single(dev, msm_uport->rx.mapped_cmd_ptr, sizeof(dmov_box), - DMA_TO_DEVICE); - dma_pool_free(msm_uport->rx.pool, msm_uport->rx.buffer, - msm_uport->rx.rbuffer); - dma_pool_destroy(msm_uport->rx.pool); - - dma_unmap_single(dev, msm_uport->rx.cmdptr_dmaaddr, sizeof(u32), - DMA_TO_DEVICE); - dma_unmap_single(dev, msm_uport->tx.mapped_cmd_ptr_ptr, sizeof(u32), - DMA_TO_DEVICE); - dma_unmap_single(dev, msm_uport->tx.mapped_cmd_ptr, sizeof(dmov_box), - DMA_TO_DEVICE); - - uart_remove_one_port(&msm_hs_driver, &msm_uport->uport); - clk_put(msm_uport->clk); - - /* Free the tx resources */ - kfree(msm_uport->tx.command_ptr); - kfree(msm_uport->tx.command_ptr_ptr); - - /* Free the rx resources */ - kfree(msm_uport->rx.command_ptr); - kfree(msm_uport->rx.command_ptr_ptr); - - iounmap(msm_uport->uport.membase); - - return 0; -} - -static int msm_hs_init_clk_locked(struct uart_port *uport) -{ - int ret; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - ret = clk_enable(msm_uport->clk); - if (ret) { - printk(KERN_ERR "Error could not turn on UART clk\n"); - return ret; - } - - /* Set up the MREG/NREG/DREG/MNDREG */ - ret = clk_set_rate(msm_uport->clk, uport->uartclk); - if (ret) { - printk(KERN_WARNING "Error setting clock rate on UART\n"); - clk_disable(msm_uport->clk); - return ret; - } - - msm_uport->clk_state = MSM_HS_CLK_ON; - return 0; -} - -/* Enable and Disable clocks (Used for power management) */ -static void msm_hs_pm(struct uart_port *uport, unsigned int state, - unsigned int oldstate) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - if (use_low_power_rx_wakeup(msm_uport) || - msm_uport->exit_lpm_cb) - return; /* ignore linux PM states, - use msm_hs_request_clock API */ - - switch (state) { - case 0: - clk_enable(msm_uport->clk); - break; - case 3: - clk_disable(msm_uport->clk); - break; - default: - dev_err(uport->dev, "msm_serial: Unknown PM state %d\n", - state); - } -} - -/* - * programs the UARTDM_CSR register with correct bit rates - * - * Interrupts should be disabled before we are called, as - * we modify Set Baud rate - * Set receive stale interrupt level, dependent on Bit Rate - * Goal is to have around 8 ms before indicate stale. - * roundup (((Bit Rate * .008) / 10) + 1 - */ -static void msm_hs_set_bps_locked(struct uart_port *uport, - unsigned int bps) -{ - unsigned long rxstale; - unsigned long data; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - switch (bps) { - case 300: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_75); - rxstale = 1; - break; - case 600: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_150); - rxstale = 1; - break; - case 1200: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_300); - rxstale = 1; - break; - case 2400: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_600); - rxstale = 1; - break; - case 4800: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_1200); - rxstale = 1; - break; - case 9600: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_2400); - rxstale = 2; - break; - case 14400: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_3600); - rxstale = 3; - break; - case 19200: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_4800); - rxstale = 4; - break; - case 28800: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_7200); - rxstale = 6; - break; - case 38400: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_9600); - rxstale = 8; - break; - case 57600: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_14400); - rxstale = 16; - break; - case 76800: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_19200); - rxstale = 16; - break; - case 115200: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_28800); - rxstale = 31; - break; - case 230400: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_57600); - rxstale = 31; - break; - case 460800: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_115200); - rxstale = 31; - break; - case 4000000: - case 3686400: - case 3200000: - case 3500000: - case 3000000: - case 2500000: - case 1500000: - case 1152000: - case 1000000: - case 921600: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_115200); - rxstale = 31; - break; - default: - msm_hs_write(uport, UARTDM_CSR_ADDR, UARTDM_CSR_2400); - /* default to 9600 */ - bps = 9600; - rxstale = 2; - break; - } - if (bps > 460800) - uport->uartclk = bps * 16; - else - uport->uartclk = UARTCLK; - - if (clk_set_rate(msm_uport->clk, uport->uartclk)) { - printk(KERN_WARNING "Error setting clock rate on UART\n"); - return; - } - - data = rxstale & UARTDM_IPR_STALE_LSB_BMSK; - data |= UARTDM_IPR_STALE_TIMEOUT_MSB_BMSK & (rxstale << 2); - - msm_hs_write(uport, UARTDM_IPR_ADDR, data); -} - -/* - * termios : new ktermios - * oldtermios: old ktermios previous setting - * - * Configure the serial port - */ -static void msm_hs_set_termios(struct uart_port *uport, - struct ktermios *termios, - struct ktermios *oldtermios) -{ - unsigned int bps; - unsigned long data; - unsigned long flags; - unsigned int c_cflag = termios->c_cflag; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - spin_lock_irqsave(&uport->lock, flags); - clk_enable(msm_uport->clk); - - /* 300 is the minimum baud support by the driver */ - bps = uart_get_baud_rate(uport, termios, oldtermios, 200, 4000000); - - /* Temporary remapping 200 BAUD to 3.2 mbps */ - if (bps == 200) - bps = 3200000; - - msm_hs_set_bps_locked(uport, bps); - - data = msm_hs_read(uport, UARTDM_MR2_ADDR); - data &= ~UARTDM_MR2_PARITY_MODE_BMSK; - /* set parity */ - if (PARENB == (c_cflag & PARENB)) { - if (PARODD == (c_cflag & PARODD)) - data |= ODD_PARITY; - else if (CMSPAR == (c_cflag & CMSPAR)) - data |= SPACE_PARITY; - else - data |= EVEN_PARITY; - } - - /* Set bits per char */ - data &= ~UARTDM_MR2_BITS_PER_CHAR_BMSK; - - switch (c_cflag & CSIZE) { - case CS5: - data |= FIVE_BPC; - break; - case CS6: - data |= SIX_BPC; - break; - case CS7: - data |= SEVEN_BPC; - break; - default: - data |= EIGHT_BPC; - break; - } - /* stop bits */ - if (c_cflag & CSTOPB) { - data |= STOP_BIT_TWO; - } else { - /* otherwise 1 stop bit */ - data |= STOP_BIT_ONE; - } - data |= UARTDM_MR2_ERROR_MODE_BMSK; - /* write parity/bits per char/stop bit configuration */ - msm_hs_write(uport, UARTDM_MR2_ADDR, data); - - /* Configure HW flow control */ - data = msm_hs_read(uport, UARTDM_MR1_ADDR); - - data &= ~(UARTDM_MR1_CTS_CTL_BMSK | UARTDM_MR1_RX_RDY_CTL_BMSK); - - if (c_cflag & CRTSCTS) { - data |= UARTDM_MR1_CTS_CTL_BMSK; - data |= UARTDM_MR1_RX_RDY_CTL_BMSK; - } - - msm_hs_write(uport, UARTDM_MR1_ADDR, data); - - uport->ignore_status_mask = termios->c_iflag & INPCK; - uport->ignore_status_mask |= termios->c_iflag & IGNPAR; - uport->read_status_mask = (termios->c_cflag & CREAD); - - msm_hs_write(uport, UARTDM_IMR_ADDR, 0); - - /* Set Transmit software time out */ - uart_update_timeout(uport, c_cflag, bps); - - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_TX); - - if (msm_uport->rx.flush == FLUSH_NONE) { - msm_uport->rx.flush = FLUSH_IGNORE; - msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1); - } - - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - - clk_disable(msm_uport->clk); - spin_unlock_irqrestore(&uport->lock, flags); -} - -/* - * Standard API, Transmitter - * Any character in the transmit shift register is sent - */ -static unsigned int msm_hs_tx_empty(struct uart_port *uport) -{ - unsigned int data; - unsigned int ret = 0; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - clk_enable(msm_uport->clk); - - data = msm_hs_read(uport, UARTDM_SR_ADDR); - if (data & UARTDM_SR_TXEMT_BMSK) - ret = TIOCSER_TEMT; - - clk_disable(msm_uport->clk); - - return ret; -} - -/* - * Standard API, Stop transmitter. - * Any character in the transmit shift register is sent as - * well as the current data mover transfer . - */ -static void msm_hs_stop_tx_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - msm_uport->tx.tx_ready_int_en = 0; -} - -/* - * Standard API, Stop receiver as soon as possible. - * - * Function immediately terminates the operation of the - * channel receiver and any incoming characters are lost. None - * of the receiver status bits are affected by this command and - * characters that are already in the receive FIFO there. - */ -static void msm_hs_stop_rx_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - unsigned int data; - - clk_enable(msm_uport->clk); - - /* disable dlink */ - data = msm_hs_read(uport, UARTDM_DMEN_ADDR); - data &= ~UARTDM_RX_DM_EN_BMSK; - msm_hs_write(uport, UARTDM_DMEN_ADDR, data); - - /* Disable the receiver */ - if (msm_uport->rx.flush == FLUSH_NONE) - msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1); - - if (msm_uport->rx.flush != FLUSH_SHUTDOWN) - msm_uport->rx.flush = FLUSH_STOP; - - clk_disable(msm_uport->clk); -} - -/* Transmit the next chunk of data */ -static void msm_hs_submit_tx_locked(struct uart_port *uport) -{ - int left; - int tx_count; - dma_addr_t src_addr; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - struct msm_hs_tx *tx = &msm_uport->tx; - struct circ_buf *tx_buf = &msm_uport->uport.state->xmit; - - if (uart_circ_empty(tx_buf) || uport->state->port.tty->stopped) { - msm_hs_stop_tx_locked(uport); - return; - } - - tx->dma_in_flight = 1; - - tx_count = uart_circ_chars_pending(tx_buf); - - if (UARTDM_TX_BUF_SIZE < tx_count) - tx_count = UARTDM_TX_BUF_SIZE; - - left = UART_XMIT_SIZE - tx_buf->tail; - - if (tx_count > left) - tx_count = left; - - src_addr = tx->dma_base + tx_buf->tail; - dma_sync_single_for_device(uport->dev, src_addr, tx_count, - DMA_TO_DEVICE); - - tx->command_ptr->num_rows = (((tx_count + 15) >> 4) << 16) | - ((tx_count + 15) >> 4); - tx->command_ptr->src_row_addr = src_addr; - - dma_sync_single_for_device(uport->dev, tx->mapped_cmd_ptr, - sizeof(dmov_box), DMA_TO_DEVICE); - - *tx->command_ptr_ptr = CMD_PTR_LP | DMOV_CMD_ADDR(tx->mapped_cmd_ptr); - - dma_sync_single_for_device(uport->dev, tx->mapped_cmd_ptr_ptr, - sizeof(u32), DMA_TO_DEVICE); - - /* Save tx_count to use in Callback */ - tx->tx_count = tx_count; - msm_hs_write(uport, UARTDM_NCF_TX_ADDR, tx_count); - - /* Disable the tx_ready interrupt */ - msm_uport->imr_reg &= ~UARTDM_ISR_TX_READY_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - msm_dmov_enqueue_cmd(msm_uport->dma_tx_channel, &tx->xfer); -} - -/* Start to receive the next chunk of data */ -static void msm_hs_start_rx_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT); - msm_hs_write(uport, UARTDM_DMRX_ADDR, UARTDM_RX_BUF_SIZE); - msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_ENABLE); - msm_uport->imr_reg |= UARTDM_ISR_RXLEV_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - - msm_uport->rx.flush = FLUSH_NONE; - msm_dmov_enqueue_cmd(msm_uport->dma_rx_channel, &msm_uport->rx.xfer); - - /* might have finished RX and be ready to clock off */ - hrtimer_start(&msm_uport->clk_off_timer, msm_uport->clk_off_delay, - HRTIMER_MODE_REL); -} - -/* Enable the transmitter Interrupt */ -static void msm_hs_start_tx_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - clk_enable(msm_uport->clk); - - if (msm_uport->exit_lpm_cb) - msm_uport->exit_lpm_cb(uport); - - if (msm_uport->tx.tx_ready_int_en == 0) { - msm_uport->tx.tx_ready_int_en = 1; - msm_hs_submit_tx_locked(uport); - } - - clk_disable(msm_uport->clk); -} - -/* - * This routine is called when we are done with a DMA transfer - * - * This routine is registered with Data mover when we set - * up a Data Mover transfer. It is called from Data mover ISR - * when the DMA transfer is done. - */ -static void msm_hs_dmov_tx_callback(struct msm_dmov_cmd *cmd_ptr, - unsigned int result, - struct msm_dmov_errdata *err) -{ - unsigned long flags; - struct msm_hs_port *msm_uport; - - /* DMA did not finish properly */ - WARN_ON((((result & RSLT_FIFO_CNTR_BMSK) >> 28) == 1) && - !(result & RSLT_VLD)); - - msm_uport = container_of(cmd_ptr, struct msm_hs_port, tx.xfer); - - spin_lock_irqsave(&msm_uport->uport.lock, flags); - clk_enable(msm_uport->clk); - - msm_uport->imr_reg |= UARTDM_ISR_TX_READY_BMSK; - msm_hs_write(&msm_uport->uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - - clk_disable(msm_uport->clk); - spin_unlock_irqrestore(&msm_uport->uport.lock, flags); -} - -/* - * This routine is called when we are done with a DMA transfer or the - * a flush has been sent to the data mover driver. - * - * This routine is registered with Data mover when we set up a Data Mover - * transfer. It is called from Data mover ISR when the DMA transfer is done. - */ -static void msm_hs_dmov_rx_callback(struct msm_dmov_cmd *cmd_ptr, - unsigned int result, - struct msm_dmov_errdata *err) -{ - int retval; - int rx_count; - unsigned long status; - unsigned int error_f = 0; - unsigned long flags; - unsigned int flush; - struct tty_port *port; - struct uart_port *uport; - struct msm_hs_port *msm_uport; - - msm_uport = container_of(cmd_ptr, struct msm_hs_port, rx.xfer); - uport = &msm_uport->uport; - - spin_lock_irqsave(&uport->lock, flags); - clk_enable(msm_uport->clk); - - port = &uport->state->port; - - msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_DISABLE); - - status = msm_hs_read(uport, UARTDM_SR_ADDR); - - /* overflow is not connect to data in a FIFO */ - if (unlikely((status & UARTDM_SR_OVERRUN_BMSK) && - (uport->read_status_mask & CREAD))) { - tty_insert_flip_char(port, 0, TTY_OVERRUN); - uport->icount.buf_overrun++; - error_f = 1; - } - - if (!(uport->ignore_status_mask & INPCK)) - status = status & ~(UARTDM_SR_PAR_FRAME_BMSK); - - if (unlikely(status & UARTDM_SR_PAR_FRAME_BMSK)) { - /* Can not tell difference between parity & frame error */ - uport->icount.parity++; - error_f = 1; - if (uport->ignore_status_mask & IGNPAR) - tty_insert_flip_char(port, 0, TTY_PARITY); - } - - if (error_f) - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_ERROR_STATUS); - - if (msm_uport->clk_req_off_state == CLK_REQ_OFF_FLUSH_ISSUED) - msm_uport->clk_req_off_state = CLK_REQ_OFF_RXSTALE_FLUSHED; - - flush = msm_uport->rx.flush; - if (flush == FLUSH_IGNORE) - msm_hs_start_rx_locked(uport); - if (flush == FLUSH_STOP) - msm_uport->rx.flush = FLUSH_SHUTDOWN; - if (flush >= FLUSH_DATA_INVALID) - goto out; - - rx_count = msm_hs_read(uport, UARTDM_RX_TOTAL_SNAP_ADDR); - - if (0 != (uport->read_status_mask & CREAD)) { - retval = tty_insert_flip_string(port, msm_uport->rx.buffer, - rx_count); - BUG_ON(retval != rx_count); - } - - msm_hs_start_rx_locked(uport); - -out: - clk_disable(msm_uport->clk); - - spin_unlock_irqrestore(&uport->lock, flags); - - if (flush < FLUSH_DATA_INVALID) - queue_work(msm_hs_workqueue, &msm_uport->rx.tty_work); -} - -static void msm_hs_tty_flip_buffer_work(struct work_struct *work) -{ - struct msm_hs_port *msm_uport = - container_of(work, struct msm_hs_port, rx.tty_work); - - tty_flip_buffer_push(&msm_uport->uport.state->port); -} - -/* - * Standard API, Current states of modem control inputs - * - * Since CTS can be handled entirely by HARDWARE we always - * indicate clear to send and count on the TX FIFO to block when - * it fills up. - * - * - TIOCM_DCD - * - TIOCM_CTS - * - TIOCM_DSR - * - TIOCM_RI - * (Unsupported) DCD and DSR will return them high. RI will return low. - */ -static unsigned int msm_hs_get_mctrl_locked(struct uart_port *uport) -{ - return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS; -} - -/* - * True enables UART auto RFR, which indicates we are ready for data if the RX - * buffer is not full. False disables auto RFR, and deasserts RFR to indicate - * we are not ready for data. Must be called with UART clock on. - */ -static void set_rfr_locked(struct uart_port *uport, int auto_rfr) -{ - unsigned int data; - - data = msm_hs_read(uport, UARTDM_MR1_ADDR); - - if (auto_rfr) { - /* enable auto ready-for-receiving */ - data |= UARTDM_MR1_RX_RDY_CTL_BMSK; - msm_hs_write(uport, UARTDM_MR1_ADDR, data); - } else { - /* disable auto ready-for-receiving */ - data &= ~UARTDM_MR1_RX_RDY_CTL_BMSK; - msm_hs_write(uport, UARTDM_MR1_ADDR, data); - /* RFR is active low, set high */ - msm_hs_write(uport, UARTDM_CR_ADDR, RFR_HIGH); - } -} - -/* - * Standard API, used to set or clear RFR - */ -static void msm_hs_set_mctrl_locked(struct uart_port *uport, - unsigned int mctrl) -{ - unsigned int auto_rfr; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - clk_enable(msm_uport->clk); - - auto_rfr = TIOCM_RTS & mctrl ? 1 : 0; - set_rfr_locked(uport, auto_rfr); - - clk_disable(msm_uport->clk); -} - -/* Standard API, Enable modem status (CTS) interrupt */ -static void msm_hs_enable_ms_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - clk_enable(msm_uport->clk); - - /* Enable DELTA_CTS Interrupt */ - msm_uport->imr_reg |= UARTDM_ISR_DELTA_CTS_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - - clk_disable(msm_uport->clk); - -} - -/* - * Standard API, Break Signal - * - * Control the transmission of a break signal. ctl eq 0 => break - * signal terminate ctl ne 0 => start break signal - */ -static void msm_hs_break_ctl(struct uart_port *uport, int ctl) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - clk_enable(msm_uport->clk); - msm_hs_write(uport, UARTDM_CR_ADDR, ctl ? START_BREAK : STOP_BREAK); - clk_disable(msm_uport->clk); -} - -static void msm_hs_config_port(struct uart_port *uport, int cfg_flags) -{ - unsigned long flags; - - spin_lock_irqsave(&uport->lock, flags); - if (cfg_flags & UART_CONFIG_TYPE) { - uport->type = PORT_MSM; - msm_hs_request_port(uport); - } - spin_unlock_irqrestore(&uport->lock, flags); -} - -/* Handle CTS changes (Called from interrupt handler) */ -static void msm_hs_handle_delta_cts_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - clk_enable(msm_uport->clk); - - /* clear interrupt */ - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_CTS); - uport->icount.cts++; - - clk_disable(msm_uport->clk); - - /* clear the IOCTL TIOCMIWAIT if called */ - wake_up_interruptible(&uport->state->port.delta_msr_wait); -} - -/* check if the TX path is flushed, and if so clock off - * returns 0 did not clock off, need to retry (still sending final byte) - * -1 did not clock off, do not retry - * 1 if we clocked off - */ -static int msm_hs_check_clock_off_locked(struct uart_port *uport) -{ - unsigned long sr_status; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - struct circ_buf *tx_buf = &uport->state->xmit; - - /* Cancel if tx tty buffer is not empty, dma is in flight, - * or tx fifo is not empty, or rx fifo is not empty */ - if (msm_uport->clk_state != MSM_HS_CLK_REQUEST_OFF || - !uart_circ_empty(tx_buf) || msm_uport->tx.dma_in_flight || - (msm_uport->imr_reg & UARTDM_ISR_TXLEV_BMSK) || - !(msm_uport->imr_reg & UARTDM_ISR_RXLEV_BMSK)) { - return -1; - } - - /* Make sure the uart is finished with the last byte */ - sr_status = msm_hs_read(uport, UARTDM_SR_ADDR); - if (!(sr_status & UARTDM_SR_TXEMT_BMSK)) - return 0; /* retry */ - - /* Make sure forced RXSTALE flush complete */ - switch (msm_uport->clk_req_off_state) { - case CLK_REQ_OFF_START: - msm_uport->clk_req_off_state = CLK_REQ_OFF_RXSTALE_ISSUED; - msm_hs_write(uport, UARTDM_CR_ADDR, FORCE_STALE_EVENT); - return 0; /* RXSTALE flush not complete - retry */ - case CLK_REQ_OFF_RXSTALE_ISSUED: - case CLK_REQ_OFF_FLUSH_ISSUED: - return 0; /* RXSTALE flush not complete - retry */ - case CLK_REQ_OFF_RXSTALE_FLUSHED: - break; /* continue */ - } - - if (msm_uport->rx.flush != FLUSH_SHUTDOWN) { - if (msm_uport->rx.flush == FLUSH_NONE) - msm_hs_stop_rx_locked(uport); - return 0; /* come back later to really clock off */ - } - - /* we really want to clock off */ - clk_disable(msm_uport->clk); - msm_uport->clk_state = MSM_HS_CLK_OFF; - - if (use_low_power_rx_wakeup(msm_uport)) { - msm_uport->rx_wakeup.ignore = 1; - enable_irq(msm_uport->rx_wakeup.irq); - } - return 1; -} - -static enum hrtimer_restart msm_hs_clk_off_retry(struct hrtimer *timer) -{ - unsigned long flags; - int ret = HRTIMER_NORESTART; - struct msm_hs_port *msm_uport = container_of(timer, struct msm_hs_port, - clk_off_timer); - struct uart_port *uport = &msm_uport->uport; - - spin_lock_irqsave(&uport->lock, flags); - - if (!msm_hs_check_clock_off_locked(uport)) { - hrtimer_forward_now(timer, msm_uport->clk_off_delay); - ret = HRTIMER_RESTART; - } - - spin_unlock_irqrestore(&uport->lock, flags); - - return ret; -} - -static irqreturn_t msm_hs_isr(int irq, void *dev) -{ - unsigned long flags; - unsigned long isr_status; - struct msm_hs_port *msm_uport = dev; - struct uart_port *uport = &msm_uport->uport; - struct circ_buf *tx_buf = &uport->state->xmit; - struct msm_hs_tx *tx = &msm_uport->tx; - struct msm_hs_rx *rx = &msm_uport->rx; - - spin_lock_irqsave(&uport->lock, flags); - - isr_status = msm_hs_read(uport, UARTDM_MISR_ADDR); - - /* Uart RX starting */ - if (isr_status & UARTDM_ISR_RXLEV_BMSK) { - msm_uport->imr_reg &= ~UARTDM_ISR_RXLEV_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - } - /* Stale rx interrupt */ - if (isr_status & UARTDM_ISR_RXSTALE_BMSK) { - msm_hs_write(uport, UARTDM_CR_ADDR, STALE_EVENT_DISABLE); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT); - - if (msm_uport->clk_req_off_state == CLK_REQ_OFF_RXSTALE_ISSUED) - msm_uport->clk_req_off_state = - CLK_REQ_OFF_FLUSH_ISSUED; - if (rx->flush == FLUSH_NONE) { - rx->flush = FLUSH_DATA_READY; - msm_dmov_stop_cmd(msm_uport->dma_rx_channel, NULL, 1); - } - } - /* tx ready interrupt */ - if (isr_status & UARTDM_ISR_TX_READY_BMSK) { - /* Clear TX Ready */ - msm_hs_write(uport, UARTDM_CR_ADDR, CLEAR_TX_READY); - - if (msm_uport->clk_state == MSM_HS_CLK_REQUEST_OFF) { - msm_uport->imr_reg |= UARTDM_ISR_TXLEV_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, - msm_uport->imr_reg); - } - - /* Complete DMA TX transactions and submit new transactions */ - tx_buf->tail = (tx_buf->tail + tx->tx_count) & ~UART_XMIT_SIZE; - - tx->dma_in_flight = 0; - - uport->icount.tx += tx->tx_count; - if (tx->tx_ready_int_en) - msm_hs_submit_tx_locked(uport); - - if (uart_circ_chars_pending(tx_buf) < WAKEUP_CHARS) - uart_write_wakeup(uport); - } - if (isr_status & UARTDM_ISR_TXLEV_BMSK) { - /* TX FIFO is empty */ - msm_uport->imr_reg &= ~UARTDM_ISR_TXLEV_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - if (!msm_hs_check_clock_off_locked(uport)) - hrtimer_start(&msm_uport->clk_off_timer, - msm_uport->clk_off_delay, - HRTIMER_MODE_REL); - } - - /* Change in CTS interrupt */ - if (isr_status & UARTDM_ISR_DELTA_CTS_BMSK) - msm_hs_handle_delta_cts_locked(uport); - - spin_unlock_irqrestore(&uport->lock, flags); - - return IRQ_HANDLED; -} - -void msm_hs_request_clock_off_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - if (msm_uport->clk_state == MSM_HS_CLK_ON) { - msm_uport->clk_state = MSM_HS_CLK_REQUEST_OFF; - msm_uport->clk_req_off_state = CLK_REQ_OFF_START; - if (!use_low_power_rx_wakeup(msm_uport)) - set_rfr_locked(uport, 0); - msm_uport->imr_reg |= UARTDM_ISR_TXLEV_BMSK; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - } -} - -/** - * msm_hs_request_clock_off - request to (i.e. asynchronously) turn off uart - * clock once pending TX is flushed and Rx DMA command is terminated. - * @uport: uart_port structure for the device instance. - * - * This functions puts the device into a partially active low power mode. It - * waits to complete all pending tx transactions, flushes ongoing Rx DMA - * command and terminates UART side Rx transaction, puts UART HW in non DMA - * mode and then clocks off the device. A client calls this when no UART - * data is expected. msm_request_clock_on() must be called before any further - * UART can be sent or received. - */ -void msm_hs_request_clock_off(struct uart_port *uport) -{ - unsigned long flags; - - spin_lock_irqsave(&uport->lock, flags); - msm_hs_request_clock_off_locked(uport); - spin_unlock_irqrestore(&uport->lock, flags); -} - -void msm_hs_request_clock_on_locked(struct uart_port *uport) -{ - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - unsigned int data; - - switch (msm_uport->clk_state) { - case MSM_HS_CLK_OFF: - clk_enable(msm_uport->clk); - disable_irq_nosync(msm_uport->rx_wakeup.irq); - /* fall-through */ - case MSM_HS_CLK_REQUEST_OFF: - if (msm_uport->rx.flush == FLUSH_STOP || - msm_uport->rx.flush == FLUSH_SHUTDOWN) { - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX); - data = msm_hs_read(uport, UARTDM_DMEN_ADDR); - data |= UARTDM_RX_DM_EN_BMSK; - msm_hs_write(uport, UARTDM_DMEN_ADDR, data); - } - hrtimer_try_to_cancel(&msm_uport->clk_off_timer); - if (msm_uport->rx.flush == FLUSH_SHUTDOWN) - msm_hs_start_rx_locked(uport); - if (!use_low_power_rx_wakeup(msm_uport)) - set_rfr_locked(uport, 1); - if (msm_uport->rx.flush == FLUSH_STOP) - msm_uport->rx.flush = FLUSH_IGNORE; - msm_uport->clk_state = MSM_HS_CLK_ON; - break; - case MSM_HS_CLK_ON: - break; - case MSM_HS_CLK_PORT_OFF: - break; - } -} - -/** - * msm_hs_request_clock_on - Switch the device from partially active low - * power mode to fully active (i.e. clock on) mode. - * @uport: uart_port structure for the device. - * - * This function switches on the input clock, puts UART HW into DMA mode - * and enqueues an Rx DMA command if the device was in partially active - * mode. It has no effect if called with the device in inactive state. - */ -void msm_hs_request_clock_on(struct uart_port *uport) -{ - unsigned long flags; - - spin_lock_irqsave(&uport->lock, flags); - msm_hs_request_clock_on_locked(uport); - spin_unlock_irqrestore(&uport->lock, flags); -} - -static irqreturn_t msm_hs_rx_wakeup_isr(int irq, void *dev) -{ - unsigned int wakeup = 0; - unsigned long flags; - struct msm_hs_port *msm_uport = dev; - struct uart_port *uport = &msm_uport->uport; - - spin_lock_irqsave(&uport->lock, flags); - if (msm_uport->clk_state == MSM_HS_CLK_OFF) { - /* ignore the first irq - it is a pending irq that occurred - * before enable_irq() */ - if (msm_uport->rx_wakeup.ignore) - msm_uport->rx_wakeup.ignore = 0; - else - wakeup = 1; - } - - if (wakeup) { - /* the uart was clocked off during an rx, wake up and - * optionally inject char into tty rx */ - msm_hs_request_clock_on_locked(uport); - if (msm_uport->rx_wakeup.inject_rx) { - tty_insert_flip_char(&uport->state->port, - msm_uport->rx_wakeup.rx_to_inject, - TTY_NORMAL); - queue_work(msm_hs_workqueue, &msm_uport->rx.tty_work); - } - } - - spin_unlock_irqrestore(&uport->lock, flags); - - return IRQ_HANDLED; -} - -static const char *msm_hs_type(struct uart_port *port) -{ - return (port->type == PORT_MSM) ? "MSM_HS_UART" : NULL; -} - -/* Called when port is opened */ -static int msm_hs_startup(struct uart_port *uport) -{ - int ret; - int rfr_level; - unsigned long flags; - unsigned int data; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - struct circ_buf *tx_buf = &uport->state->xmit; - struct msm_hs_tx *tx = &msm_uport->tx; - struct msm_hs_rx *rx = &msm_uport->rx; - - rfr_level = uport->fifosize; - if (rfr_level > 16) - rfr_level -= 16; - - tx->dma_base = dma_map_single(uport->dev, tx_buf->buf, UART_XMIT_SIZE, - DMA_TO_DEVICE); - - /* do not let tty layer execute RX in global workqueue, use a - * dedicated workqueue managed by this driver */ - uport->state->port.low_latency = 1; - - /* turn on uart clk */ - ret = msm_hs_init_clk_locked(uport); - if (unlikely(ret)) { - printk(KERN_ERR "Turning uartclk failed!\n"); - goto err_msm_hs_init_clk; - } - - /* Set auto RFR Level */ - data = msm_hs_read(uport, UARTDM_MR1_ADDR); - data &= ~UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK; - data &= ~UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK; - data |= (UARTDM_MR1_AUTO_RFR_LEVEL1_BMSK & (rfr_level << 2)); - data |= (UARTDM_MR1_AUTO_RFR_LEVEL0_BMSK & rfr_level); - msm_hs_write(uport, UARTDM_MR1_ADDR, data); - - /* Make sure RXSTALE count is non-zero */ - data = msm_hs_read(uport, UARTDM_IPR_ADDR); - if (!data) { - data |= 0x1f & UARTDM_IPR_STALE_LSB_BMSK; - msm_hs_write(uport, UARTDM_IPR_ADDR, data); - } - - /* Enable Data Mover Mode */ - data = UARTDM_TX_DM_EN_BMSK | UARTDM_RX_DM_EN_BMSK; - msm_hs_write(uport, UARTDM_DMEN_ADDR, data); - - /* Reset TX */ - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_TX); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_RX); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_ERROR_STATUS); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_BREAK_INT); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_STALE_INT); - msm_hs_write(uport, UARTDM_CR_ADDR, RESET_CTS); - msm_hs_write(uport, UARTDM_CR_ADDR, RFR_LOW); - /* Turn on Uart Receiver */ - msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_RX_EN_BMSK); - - /* Turn on Uart Transmitter */ - msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_TX_EN_BMSK); - - /* Initialize the tx */ - tx->tx_ready_int_en = 0; - tx->dma_in_flight = 0; - - tx->xfer.complete_func = msm_hs_dmov_tx_callback; - tx->xfer.execute_func = NULL; - - tx->command_ptr->cmd = CMD_LC | - CMD_DST_CRCI(msm_uport->dma_tx_crci) | CMD_MODE_BOX; - - tx->command_ptr->src_dst_len = (MSM_UARTDM_BURST_SIZE << 16) - | (MSM_UARTDM_BURST_SIZE); - - tx->command_ptr->row_offset = (MSM_UARTDM_BURST_SIZE << 16); - - tx->command_ptr->dst_row_addr = - msm_uport->uport.mapbase + UARTDM_TF_ADDR; - - - /* Turn on Uart Receive */ - rx->xfer.complete_func = msm_hs_dmov_rx_callback; - rx->xfer.execute_func = NULL; - - rx->command_ptr->cmd = CMD_LC | - CMD_SRC_CRCI(msm_uport->dma_rx_crci) | CMD_MODE_BOX; - - rx->command_ptr->src_dst_len = (MSM_UARTDM_BURST_SIZE << 16) - | (MSM_UARTDM_BURST_SIZE); - rx->command_ptr->row_offset = MSM_UARTDM_BURST_SIZE; - rx->command_ptr->src_row_addr = uport->mapbase + UARTDM_RF_ADDR; - - - msm_uport->imr_reg |= UARTDM_ISR_RXSTALE_BMSK; - /* Enable reading the current CTS, no harm even if CTS is ignored */ - msm_uport->imr_reg |= UARTDM_ISR_CURRENT_CTS_BMSK; - - msm_hs_write(uport, UARTDM_TFWR_ADDR, 0); /* TXLEV on empty TX fifo */ - - - ret = request_irq(uport->irq, msm_hs_isr, IRQF_TRIGGER_HIGH, - "msm_hs_uart", msm_uport); - if (unlikely(ret)) { - printk(KERN_ERR "Request msm_hs_uart IRQ failed!\n"); - goto err_request_irq; - } - if (use_low_power_rx_wakeup(msm_uport)) { - ret = request_irq(msm_uport->rx_wakeup.irq, - msm_hs_rx_wakeup_isr, - IRQF_TRIGGER_FALLING, - "msm_hs_rx_wakeup", msm_uport); - if (unlikely(ret)) { - printk(KERN_ERR "Request msm_hs_rx_wakeup IRQ failed!\n"); - free_irq(uport->irq, msm_uport); - goto err_request_irq; - } - disable_irq(msm_uport->rx_wakeup.irq); - } - - spin_lock_irqsave(&uport->lock, flags); - - msm_hs_write(uport, UARTDM_RFWR_ADDR, 0); - msm_hs_start_rx_locked(uport); - - spin_unlock_irqrestore(&uport->lock, flags); - ret = pm_runtime_set_active(uport->dev); - if (ret) - dev_err(uport->dev, "set active error:%d\n", ret); - pm_runtime_enable(uport->dev); - - return 0; - -err_request_irq: -err_msm_hs_init_clk: - dma_unmap_single(uport->dev, tx->dma_base, - UART_XMIT_SIZE, DMA_TO_DEVICE); - return ret; -} - -/* Initialize tx and rx data structures */ -static int uartdm_init_port(struct uart_port *uport) -{ - int ret = 0; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - struct msm_hs_tx *tx = &msm_uport->tx; - struct msm_hs_rx *rx = &msm_uport->rx; - - /* Allocate the command pointer. Needs to be 64 bit aligned */ - tx->command_ptr = kmalloc(sizeof(dmov_box), GFP_KERNEL | __GFP_DMA); - if (!tx->command_ptr) - return -ENOMEM; - - tx->command_ptr_ptr = kmalloc(sizeof(u32), GFP_KERNEL | __GFP_DMA); - if (!tx->command_ptr_ptr) { - ret = -ENOMEM; - goto err_tx_command_ptr_ptr; - } - - tx->mapped_cmd_ptr = dma_map_single(uport->dev, tx->command_ptr, - sizeof(dmov_box), DMA_TO_DEVICE); - tx->mapped_cmd_ptr_ptr = dma_map_single(uport->dev, - tx->command_ptr_ptr, - sizeof(u32), DMA_TO_DEVICE); - tx->xfer.cmdptr = DMOV_CMD_ADDR(tx->mapped_cmd_ptr_ptr); - - init_waitqueue_head(&rx->wait); - - rx->pool = dma_pool_create("rx_buffer_pool", uport->dev, - UARTDM_RX_BUF_SIZE, 16, 0); - if (!rx->pool) { - pr_err("%s(): cannot allocate rx_buffer_pool", __func__); - ret = -ENOMEM; - goto err_dma_pool_create; - } - - rx->buffer = dma_pool_alloc(rx->pool, GFP_KERNEL, &rx->rbuffer); - if (!rx->buffer) { - pr_err("%s(): cannot allocate rx->buffer", __func__); - ret = -ENOMEM; - goto err_dma_pool_alloc; - } - - /* Allocate the command pointer. Needs to be 64 bit aligned */ - rx->command_ptr = kmalloc(sizeof(dmov_box), GFP_KERNEL | __GFP_DMA); - if (!rx->command_ptr) { - pr_err("%s(): cannot allocate rx->command_ptr", __func__); - ret = -ENOMEM; - goto err_rx_command_ptr; - } - - rx->command_ptr_ptr = kmalloc(sizeof(u32), GFP_KERNEL | __GFP_DMA); - if (!rx->command_ptr_ptr) { - pr_err("%s(): cannot allocate rx->command_ptr_ptr", __func__); - ret = -ENOMEM; - goto err_rx_command_ptr_ptr; - } - - rx->command_ptr->num_rows = ((UARTDM_RX_BUF_SIZE >> 4) << 16) | - (UARTDM_RX_BUF_SIZE >> 4); - - rx->command_ptr->dst_row_addr = rx->rbuffer; - - rx->mapped_cmd_ptr = dma_map_single(uport->dev, rx->command_ptr, - sizeof(dmov_box), DMA_TO_DEVICE); - - *rx->command_ptr_ptr = CMD_PTR_LP | DMOV_CMD_ADDR(rx->mapped_cmd_ptr); - - rx->cmdptr_dmaaddr = dma_map_single(uport->dev, rx->command_ptr_ptr, - sizeof(u32), DMA_TO_DEVICE); - rx->xfer.cmdptr = DMOV_CMD_ADDR(rx->cmdptr_dmaaddr); - - INIT_WORK(&rx->tty_work, msm_hs_tty_flip_buffer_work); - - return ret; - -err_rx_command_ptr_ptr: - kfree(rx->command_ptr); -err_rx_command_ptr: - dma_pool_free(msm_uport->rx.pool, msm_uport->rx.buffer, - msm_uport->rx.rbuffer); -err_dma_pool_alloc: - dma_pool_destroy(msm_uport->rx.pool); -err_dma_pool_create: - dma_unmap_single(uport->dev, msm_uport->tx.mapped_cmd_ptr_ptr, - sizeof(u32), DMA_TO_DEVICE); - dma_unmap_single(uport->dev, msm_uport->tx.mapped_cmd_ptr, - sizeof(dmov_box), DMA_TO_DEVICE); - kfree(msm_uport->tx.command_ptr_ptr); -err_tx_command_ptr_ptr: - kfree(msm_uport->tx.command_ptr); - return ret; -} - -static int msm_hs_probe(struct platform_device *pdev) -{ - int ret; - struct uart_port *uport; - struct msm_hs_port *msm_uport; - struct resource *resource; - const struct msm_serial_hs_platform_data *pdata = - dev_get_platdata(&pdev->dev); - - if (pdev->id < 0 || pdev->id >= UARTDM_NR) { - printk(KERN_ERR "Invalid plaform device ID = %d\n", pdev->id); - return -EINVAL; - } - - msm_uport = &q_uart_port[pdev->id]; - uport = &msm_uport->uport; - - uport->dev = &pdev->dev; - - resource = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (unlikely(!resource)) - return -ENXIO; - - uport->mapbase = resource->start; - uport->irq = platform_get_irq(pdev, 0); - if (unlikely(uport->irq < 0)) - return -ENXIO; - - if (unlikely(irq_set_irq_wake(uport->irq, 1))) - return -ENXIO; - - if (pdata == NULL || pdata->rx_wakeup_irq < 0) - msm_uport->rx_wakeup.irq = -1; - else { - msm_uport->rx_wakeup.irq = pdata->rx_wakeup_irq; - msm_uport->rx_wakeup.ignore = 1; - msm_uport->rx_wakeup.inject_rx = pdata->inject_rx_on_wakeup; - msm_uport->rx_wakeup.rx_to_inject = pdata->rx_to_inject; - - if (unlikely(msm_uport->rx_wakeup.irq < 0)) - return -ENXIO; - - if (unlikely(irq_set_irq_wake(msm_uport->rx_wakeup.irq, 1))) - return -ENXIO; - } - - if (pdata == NULL) - msm_uport->exit_lpm_cb = NULL; - else - msm_uport->exit_lpm_cb = pdata->exit_lpm_cb; - - resource = platform_get_resource_byname(pdev, IORESOURCE_DMA, - "uartdm_channels"); - if (unlikely(!resource)) - return -ENXIO; - - msm_uport->dma_tx_channel = resource->start; - msm_uport->dma_rx_channel = resource->end; - - resource = platform_get_resource_byname(pdev, IORESOURCE_DMA, - "uartdm_crci"); - if (unlikely(!resource)) - return -ENXIO; - - msm_uport->dma_tx_crci = resource->start; - msm_uport->dma_rx_crci = resource->end; - - uport->iotype = UPIO_MEM; - uport->fifosize = UART_FIFOSIZE; - uport->ops = &msm_hs_ops; - uport->flags = UPF_BOOT_AUTOCONF; - uport->uartclk = UARTCLK; - msm_uport->imr_reg = 0x0; - msm_uport->clk = clk_get(&pdev->dev, "uartdm_clk"); - if (IS_ERR(msm_uport->clk)) - return PTR_ERR(msm_uport->clk); - - ret = uartdm_init_port(uport); - if (unlikely(ret)) - return ret; - - msm_uport->clk_state = MSM_HS_CLK_PORT_OFF; - hrtimer_init(&msm_uport->clk_off_timer, CLOCK_MONOTONIC, - HRTIMER_MODE_REL); - msm_uport->clk_off_timer.function = msm_hs_clk_off_retry; - msm_uport->clk_off_delay = ktime_set(0, 1000000); /* 1ms */ - - uport->line = pdev->id; - return uart_add_one_port(&msm_hs_driver, uport); -} - -static int __init msm_serial_hs_init(void) -{ - int ret, i; - - /* Init all UARTS as non-configured */ - for (i = 0; i < UARTDM_NR; i++) - q_uart_port[i].uport.type = PORT_UNKNOWN; - - msm_hs_workqueue = create_singlethread_workqueue("msm_serial_hs"); - if (unlikely(!msm_hs_workqueue)) - return -ENOMEM; - - ret = uart_register_driver(&msm_hs_driver); - if (unlikely(ret)) { - printk(KERN_ERR "%s failed to load\n", __func__); - goto err_uart_register_driver; - } - - ret = platform_driver_register(&msm_serial_hs_platform_driver); - if (ret) { - printk(KERN_ERR "%s failed to load\n", __func__); - goto err_platform_driver_register; - } - - return ret; - -err_platform_driver_register: - uart_unregister_driver(&msm_hs_driver); -err_uart_register_driver: - destroy_workqueue(msm_hs_workqueue); - return ret; -} -module_init(msm_serial_hs_init); - -/* - * Called by the upper layer when port is closed. - * - Disables the port - * - Unhook the ISR - */ -static void msm_hs_shutdown(struct uart_port *uport) -{ - unsigned long flags; - struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport); - - BUG_ON(msm_uport->rx.flush < FLUSH_STOP); - - spin_lock_irqsave(&uport->lock, flags); - clk_enable(msm_uport->clk); - - /* Disable the transmitter */ - msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_TX_DISABLE_BMSK); - /* Disable the receiver */ - msm_hs_write(uport, UARTDM_CR_ADDR, UARTDM_CR_RX_DISABLE_BMSK); - - pm_runtime_disable(uport->dev); - pm_runtime_set_suspended(uport->dev); - - /* Free the interrupt */ - free_irq(uport->irq, msm_uport); - if (use_low_power_rx_wakeup(msm_uport)) - free_irq(msm_uport->rx_wakeup.irq, msm_uport); - - msm_uport->imr_reg = 0; - msm_hs_write(uport, UARTDM_IMR_ADDR, msm_uport->imr_reg); - - wait_event(msm_uport->rx.wait, msm_uport->rx.flush == FLUSH_SHUTDOWN); - - clk_disable(msm_uport->clk); /* to balance local clk_enable() */ - if (msm_uport->clk_state != MSM_HS_CLK_OFF) - clk_disable(msm_uport->clk); /* to balance clk_state */ - msm_uport->clk_state = MSM_HS_CLK_PORT_OFF; - - dma_unmap_single(uport->dev, msm_uport->tx.dma_base, - UART_XMIT_SIZE, DMA_TO_DEVICE); - - spin_unlock_irqrestore(&uport->lock, flags); - - if (cancel_work_sync(&msm_uport->rx.tty_work)) - msm_hs_tty_flip_buffer_work(&msm_uport->rx.tty_work); -} - -static void __exit msm_serial_hs_exit(void) -{ - flush_workqueue(msm_hs_workqueue); - destroy_workqueue(msm_hs_workqueue); - platform_driver_unregister(&msm_serial_hs_platform_driver); - uart_unregister_driver(&msm_hs_driver); -} -module_exit(msm_serial_hs_exit); - -#ifdef CONFIG_PM -static int msm_hs_runtime_idle(struct device *dev) -{ - /* - * returning success from idle results in runtime suspend to be - * called - */ - return 0; -} - -static int msm_hs_runtime_resume(struct device *dev) -{ - struct platform_device *pdev = container_of(dev, struct - platform_device, dev); - struct msm_hs_port *msm_uport = &q_uart_port[pdev->id]; - - msm_hs_request_clock_on(&msm_uport->uport); - return 0; -} - -static int msm_hs_runtime_suspend(struct device *dev) -{ - struct platform_device *pdev = container_of(dev, struct - platform_device, dev); - struct msm_hs_port *msm_uport = &q_uart_port[pdev->id]; - - msm_hs_request_clock_off(&msm_uport->uport); - return 0; -} -#else -#define msm_hs_runtime_idle NULL -#define msm_hs_runtime_resume NULL -#define msm_hs_runtime_suspend NULL -#endif - -static const struct dev_pm_ops msm_hs_dev_pm_ops = { - .runtime_suspend = msm_hs_runtime_suspend, - .runtime_resume = msm_hs_runtime_resume, - .runtime_idle = msm_hs_runtime_idle, -}; - -static struct platform_driver msm_serial_hs_platform_driver = { - .probe = msm_hs_probe, - .remove = msm_hs_remove, - .driver = { - .name = "msm_serial_hs", - .pm = &msm_hs_dev_pm_ops, - }, -}; - -static struct uart_driver msm_hs_driver = { - .owner = THIS_MODULE, - .driver_name = "msm_serial_hs", - .dev_name = "ttyHS", - .nr = UARTDM_NR, - .cons = 0, -}; - -static struct uart_ops msm_hs_ops = { - .tx_empty = msm_hs_tx_empty, - .set_mctrl = msm_hs_set_mctrl_locked, - .get_mctrl = msm_hs_get_mctrl_locked, - .stop_tx = msm_hs_stop_tx_locked, - .start_tx = msm_hs_start_tx_locked, - .stop_rx = msm_hs_stop_rx_locked, - .enable_ms = msm_hs_enable_ms_locked, - .break_ctl = msm_hs_break_ctl, - .startup = msm_hs_startup, - .shutdown = msm_hs_shutdown, - .set_termios = msm_hs_set_termios, - .pm = msm_hs_pm, - .type = msm_hs_type, - .config_port = msm_hs_config_port, - .release_port = msm_hs_release_port, - .request_port = msm_hs_request_port, -}; - -MODULE_DESCRIPTION("High Speed UART Driver for the MSM chipset"); -MODULE_VERSION("1.2"); -MODULE_LICENSE("GPL v2"); diff --git a/include/linux/platform_data/msm_serial_hs.h b/include/linux/platform_data/msm_serial_hs.h deleted file mode 100644 index 98a2046f8b31..000000000000 --- a/include/linux/platform_data/msm_serial_hs.h +++ /dev/null @@ -1,49 +0,0 @@ -/* - * Copyright (C) 2008 Google, Inc. - * Author: Nick Pelly - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#ifndef __ASM_ARCH_MSM_SERIAL_HS_H -#define __ASM_ARCH_MSM_SERIAL_HS_H - -#include - -/* API to request the uart clock off or on for low power management - * Clients should call request_clock_off() when no uart data is expected, - * and must call request_clock_on() before any further uart data can be - * received. */ -extern void msm_hs_request_clock_off(struct uart_port *uport); -extern void msm_hs_request_clock_on(struct uart_port *uport); - -/** - * struct msm_serial_hs_platform_data - * @rx_wakeup_irq: Rx activity irq - * @rx_to_inject: extra character to be inserted to Rx tty on wakeup - * @inject_rx: 1 = insert rx_to_inject. 0 = do not insert extra character - * @exit_lpm_cb: function called before every Tx transaction - * - * This is an optional structure required for UART Rx GPIO IRQ based - * wakeup from low power state. UART wakeup can be triggered by RX activity - * (using a wakeup GPIO on the UART RX pin). This should only be used if - * there is not a wakeup GPIO on the UART CTS, and the first RX byte is - * known (eg., with the Bluetooth Texas Instruments HCILL protocol), - * since the first RX byte will always be lost. RTS will be asserted even - * while the UART is clocked off in this mode of operation. - */ -struct msm_serial_hs_platform_data { - int rx_wakeup_irq; - unsigned char inject_rx_on_wakeup; - char rx_to_inject; - void (*exit_lpm_cb)(struct uart_port *); -}; - -#endif -- cgit From 1cf94d3a115ad118a36cba2c9a5383acda94e544 Mon Sep 17 00:00:00 2001 From: Doug Kehn Date: Tue, 24 Mar 2015 08:19:27 -0500 Subject: tty/serial: omap: fix !wakeirq message When wakeirq is not used/enabled, "no wakeirq for uart0" is output for all TTY as the log message is generated before the port line is initialized. [ 0.802656] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 0.811700] omap_uart 44e09000.serial: no wakeirq for uart0 [ 0.812379] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88, base_baud = 3000000) is a OMAP UART0 [ 1.503622] console [ttyO0] enabled [ 1.509836] omap_uart 48022000.serial: no wakeirq for uart0 [ 1.516118] 48022000.serial: ttyO1 at MMIO 0x48022000 (irq = 89, base_baud = 3000000) is a OMAP UART1 [ 1.527711] omap_uart 48024000.serial: no wakeirq for uart0 [ 1.533881] 48024000.serial: ttyO2 at MMIO 0x48024000 (irq = 90, base_baud = 3000000) is a OMAP UART2 [ 1.545324] omap_uart 481a6000.serial: no wakeirq for uart0 [ 1.551410] 481a6000.serial: ttyO3 at MMIO 0x481a6000 (irq = 60, base_baud = 3000000) is a OMAP UART3 [ 1.562946] omap_uart 481a8000.serial: no wakeirq for uart0 [ 1.569036] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61, base_baud = 3000000) is a OMAP UART4 Fix by moving wakeirq initialization, check, and dev_info() call to after port line initialization and validation. Signed-off-by: Doug Kehn Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/omap-serial.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 10256fa04b40..211479aa34bb 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -1654,11 +1654,6 @@ static int serial_omap_probe(struct platform_device *pdev) up->port.type = PORT_OMAP; up->port.iotype = UPIO_MEM; up->port.irq = uartirq; - up->wakeirq = wakeirq; - if (!up->wakeirq) - dev_info(up->port.dev, "no wakeirq for uart%d\n", - up->port.line); - up->port.regshift = 2; up->port.fifosize = 64; up->port.ops = &serial_omap_pops; @@ -1682,6 +1677,11 @@ static int serial_omap_probe(struct platform_device *pdev) goto err_port_line; } + up->wakeirq = wakeirq; + if (!up->wakeirq) + dev_info(up->port.dev, "no wakeirq for uart%d\n", + up->port.line); + ret = serial_omap_probe_rs485(up, pdev->dev.of_node); if (ret < 0) goto err_rs485; -- cgit From 11b03ea0c1ef1cd2df3e7ea0437a13e2dfb65f60 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 17 Mar 2015 00:28:46 +0100 Subject: sc16is7xx: remove ports on probe error path If ports are not explicitly removed on the error path the device will not get properly unregistered leaving /dev/ttySC* nodes in the filesystem. Signed-off-by: Jakub Kicinski Signed-off-by: Jon Ringle Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sc16is7xx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index df9a384dfbda..11bb44039a57 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1120,6 +1120,9 @@ static int sc16is7xx_probe(struct device *dev, if (!ret) return 0; + for (i = 0; i < s->uart.nr; i++) + uart_remove_one_port(&s->uart, &s->p[i].port); + mutex_destroy(&s->mutex); #ifdef CONFIG_GPIOLIB -- cgit From 9764e7a0f63bda5664cb985f992002c6eccef641 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 17 Mar 2015 00:28:47 +0100 Subject: sc16is7xx: don't wipe out port configuration on shutdown EFCR register contains RS-485 configuration which should not be changed by shutdown. Instead of doing a write only update the appropriate bits. Signed-off-by: Jakub Kicinski Signed-off-by: Jon Ringle Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sc16is7xx.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 11bb44039a57..e6b396e584f3 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -903,9 +903,11 @@ static void sc16is7xx_shutdown(struct uart_port *port) /* Disable all interrupts */ sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0); /* Disable TX/RX */ - sc16is7xx_port_write(port, SC16IS7XX_EFCR_REG, - SC16IS7XX_EFCR_RXDISABLE_BIT | - SC16IS7XX_EFCR_TXDISABLE_BIT); + sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, + SC16IS7XX_EFCR_RXDISABLE_BIT | + SC16IS7XX_EFCR_TXDISABLE_BIT, + SC16IS7XX_EFCR_RXDISABLE_BIT | + SC16IS7XX_EFCR_TXDISABLE_BIT); sc16is7xx_power(port, 0); } -- cgit From 0814e8d5da2b6f25088fe28d5e23f511d8441883 Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 17 Mar 2015 00:28:49 +0100 Subject: sc16is7xx: enable the clock Although clk_disable_unprepare() is called both on .remove() and in .probe() error path, the clock is never actually enabled. Signed-off-by: Jakub Kicinski Signed-off-by: Jon Ringle Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sc16is7xx.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index e6b396e584f3..36b3c266925d 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -1050,6 +1050,7 @@ static int sc16is7xx_probe(struct device *dev, else return PTR_ERR(s->clk); } else { + clk_prepare_enable(s->clk); freq = clk_get_rate(s->clk); } -- cgit From cb772fe75fa189c25ec258d36dabf914205e6635 Mon Sep 17 00:00:00 2001 From: Nobuhiro Iwamatsu Date: Tue, 17 Mar 2015 01:19:19 +0900 Subject: serial: sh-sci: Add overrun handling of SCIFA and SCIFB SCIFA and SCIFB can detect the overrun, but it does not support. This adds overrun handling of SCIFA and SCIFB. Signed-off-by: Nobuhiro Iwamatsu Signed-off-by: Yoshihiro Kaneko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sh-sci.c | 48 +++++++++++++++++++++++++++++++++------------ 1 file changed, 36 insertions(+), 12 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 5b50c792ad5f..5bf997253a46 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -844,14 +844,32 @@ static int sci_handle_fifo_overrun(struct uart_port *port) struct tty_port *tport = &port->state->port; struct sci_port *s = to_sci_port(port); struct plat_sci_reg *reg; - int copied = 0; + int copied = 0, offset; + u16 status, bit; - reg = sci_getreg(port, SCLSR); + switch (port->type) { + case PORT_SCIF: + case PORT_HSCIF: + offset = SCLSR; + break; + case PORT_SCIFA: + case PORT_SCIFB: + offset = SCxSR; + break; + default: + return 0; + } + + reg = sci_getreg(port, offset); if (!reg->size) return 0; - if ((serial_port_in(port, SCLSR) & (1 << s->overrun_bit))) { - serial_port_out(port, SCLSR, 0); + status = serial_port_in(port, offset); + bit = 1 << s->overrun_bit; + + if (status & bit) { + status &= ~bit; + serial_port_out(port, offset, status); port->icount.overrun++; @@ -996,16 +1014,24 @@ static inline unsigned long port_rx_irq_mask(struct uart_port *port) static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) { - unsigned short ssr_status, scr_status, err_enabled; - unsigned short slr_status = 0; + unsigned short ssr_status, scr_status, err_enabled, orer_status = 0; struct uart_port *port = ptr; struct sci_port *s = to_sci_port(port); irqreturn_t ret = IRQ_NONE; ssr_status = serial_port_in(port, SCxSR); scr_status = serial_port_in(port, SCSCR); - if (port->type == PORT_SCIF || port->type == PORT_HSCIF) - slr_status = serial_port_in(port, SCLSR); + switch (port->type) { + case PORT_SCIF: + case PORT_HSCIF: + orer_status = serial_port_in(port, SCLSR); + break; + case PORT_SCIFA: + case PORT_SCIFB: + orer_status = ssr_status; + break; + } + err_enabled = scr_status & port_rx_irq_mask(port); /* Tx Interrupt */ @@ -1033,10 +1059,8 @@ static irqreturn_t sci_mpxed_interrupt(int irq, void *ptr) ret = sci_br_interrupt(irq, ptr); /* Overrun Interrupt */ - if (port->type == PORT_SCIF || port->type == PORT_HSCIF) { - if (slr_status & 0x01) - sci_handle_fifo_overrun(port); - } + if (orer_status & (1 << s->overrun_bit)) + sci_handle_fifo_overrun(port); return ret; } -- cgit From 5f6d851564a978085e23ccc41ee95cfa3a2ee43e Mon Sep 17 00:00:00 2001 From: Nobuhiro Iwamatsu Date: Tue, 17 Mar 2015 01:19:54 +0900 Subject: serial: sh-sci: Update calculation of timeout for DMA The current calculation method in the case of 9600bps, rounding error occurs has become setting that occur timeout faster than the required time. When we use 9600bps, 32byte buffer, 10 bit (CS8) and 100 HZ, it becomes 3 jiffies (30msec). In fact it is necessary 33msec. This updates to the calculation that are not actually less than the value set by the rounding error. Also, this is nothing will be calculated value when there is no load. If there are a lot of case load, overrun error will occur immediately. This is by the buffer size to be calculated twice the DMA buffer, and add the change of setting a sufficient time-out value. Signed-off-by: Nobuhiro Iwamatsu Signed-off-by: Yoshihiro Kaneko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sh-sci.c | 40 +++++++++++++++++++++++++++++++--------- 1 file changed, 31 insertions(+), 9 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 5bf997253a46..e7d6566fafaf 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1991,18 +1991,40 @@ static void sci_set_termios(struct uart_port *port, struct ktermios *termios, #ifdef CONFIG_SERIAL_SH_SCI_DMA /* - * Calculate delay for 1.5 DMA buffers: see - * drivers/serial/serial_core.c::uart_update_timeout(). With 10 bits - * (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function + * Calculate delay for 2 DMA buffers (4 FIFO). + * See drivers/serial/serial_core.c::uart_update_timeout(). With 10 + * bits (CS8), 250Hz, 115200 baud and 64 bytes FIFO, the above function * calculates 1 jiffie for the data plus 5 jiffies for the "slop(e)." - * Then below we calculate 3 jiffies (12ms) for 1.5 DMA buffers (3 FIFO - * sizes), but it has been found out experimentally, that this is not - * enough: the driver too often needlessly runs on a DMA timeout. 20ms - * as a minimum seem to work perfectly. + * Then below we calculate 5 jiffies (20ms) for 2 DMA buffers (4 FIFO + * sizes), but when performing a faster transfer, value obtained by + * this formula is may not enough. Therefore, if value is smaller than + * 20msec, this sets 20msec as timeout of DMA. */ if (s->chan_rx) { - s->rx_timeout = (port->timeout - HZ / 50) * s->buf_len_rx * 3 / - port->fifosize / 2; + unsigned int bits; + + /* byte size and parity */ + switch (termios->c_cflag & CSIZE) { + case CS5: + bits = 7; + break; + case CS6: + bits = 8; + break; + case CS7: + bits = 9; + break; + default: + bits = 10; + break; + } + + if (termios->c_cflag & CSTOPB) + bits++; + if (termios->c_cflag & PARENB) + bits++; + s->rx_timeout = DIV_ROUND_UP((s->buf_len_rx * 2 * bits * HZ) / + (baud / 10), 10); dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n", s->rx_timeout * 1000 / HZ, port->timeout); if (s->rx_timeout < msecs_to_jiffies(20)) -- cgit From 37ff5252b3ae141eba2dcf20693484e4b53176b1 Mon Sep 17 00:00:00 2001 From: Fabian Frederick Date: Mon, 16 Mar 2015 20:17:10 +0100 Subject: tty/hvc_opal: constify of_device_id array of_device_id is always used as const. (See driver.of_match_table and open firmware functions) Signed-off-by: Fabian Frederick Signed-off-by: Greg Kroah-Hartman --- drivers/tty/hvc/hvc_opal.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/hvc/hvc_opal.c b/drivers/tty/hvc/hvc_opal.c index 071551bf3e9a..543b234e70fc 100644 --- a/drivers/tty/hvc/hvc_opal.c +++ b/drivers/tty/hvc/hvc_opal.c @@ -41,7 +41,7 @@ static const char hvc_opal_name[] = "hvc_opal"; -static struct of_device_id hvc_opal_match[] = { +static const struct of_device_id hvc_opal_match[] = { { .name = "serial", .compatible = "ibm,opal-console-raw" }, { .name = "serial", .compatible = "ibm,opal-console-hvsi" }, { }, -- cgit From ed0bb2323c9321b91dfa0ea8317fdc4d9592dce4 Mon Sep 17 00:00:00 2001 From: Fabian Frederick Date: Mon, 16 Mar 2015 20:17:11 +0100 Subject: tty: constify of_device_id array of_device_id is always used as const. (See driver.of_match_table and open firmware functions) Signed-off-by: Fabian Frederick Acked-by: Peter Korsgaard Acked-by: Timur Tabi Acked-by: Patrice Chotard Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/apbuart.c | 2 +- drivers/tty/serial/cpm_uart/cpm_uart_core.c | 2 +- drivers/tty/serial/fsl_lpuart.c | 2 +- drivers/tty/serial/mpc52xx_uart.c | 2 +- drivers/tty/serial/mxs-auart.c | 2 +- drivers/tty/serial/of_serial.c | 4 ++-- drivers/tty/serial/pmac_zilog.c | 2 +- drivers/tty/serial/pxa.c | 2 +- drivers/tty/serial/serial-tegra.c | 2 +- drivers/tty/serial/sirfsoc_uart.c | 2 +- drivers/tty/serial/st-asc.c | 2 +- drivers/tty/serial/uartlite.c | 2 +- drivers/tty/serial/ucc_uart.c | 2 +- drivers/tty/serial/xilinx_uartps.c | 2 +- 14 files changed, 15 insertions(+), 15 deletions(-) diff --git a/drivers/tty/serial/apbuart.c b/drivers/tty/serial/apbuart.c index 4f0f95e358e8..f3af317131ac 100644 --- a/drivers/tty/serial/apbuart.c +++ b/drivers/tty/serial/apbuart.c @@ -572,7 +572,7 @@ static int apbuart_probe(struct platform_device *op) return 0; } -static struct of_device_id apbuart_match[] = { +static const struct of_device_id apbuart_match[] = { { .name = "GAISLER_APBUART", }, diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c index fddb1fd4d9d3..08431adeacd5 100644 --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c @@ -1435,7 +1435,7 @@ static int cpm_uart_remove(struct platform_device *ofdev) return uart_remove_one_port(&cpm_reg, &pinfo->port); } -static struct of_device_id cpm_uart_match[] = { +static const struct of_device_id cpm_uart_match[] = { { .compatible = "fsl,cpm1-smc-uart", }, diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index b1893f3f88f1..946273a0dec4 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -257,7 +257,7 @@ struct lpuart_port { struct timer_list lpuart_timer; }; -static struct of_device_id lpuart_dt_ids[] = { +static const struct of_device_id lpuart_dt_ids[] = { { .compatible = "fsl,vf610-lpuart", }, diff --git a/drivers/tty/serial/mpc52xx_uart.c b/drivers/tty/serial/mpc52xx_uart.c index 3308ef243dc3..1589f17c1fca 100644 --- a/drivers/tty/serial/mpc52xx_uart.c +++ b/drivers/tty/serial/mpc52xx_uart.c @@ -1717,7 +1717,7 @@ static struct uart_driver mpc52xx_uart_driver = { /* OF Platform Driver */ /* ======================================================================== */ -static struct of_device_id mpc52xx_uart_of_match[] = { +static const struct of_device_id mpc52xx_uart_of_match[] = { #ifdef CONFIG_PPC_MPC52xx { .compatible = "fsl,mpc5200b-psc-uart", .data = &mpc5200b_psc_ops, }, { .compatible = "fsl,mpc5200-psc-uart", .data = &mpc52xx_psc_ops, }, diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c index 20a863bde78d..f7e5825b55ab 100644 --- a/drivers/tty/serial/mxs-auart.c +++ b/drivers/tty/serial/mxs-auart.c @@ -176,7 +176,7 @@ static struct platform_device_id mxs_auart_devtype[] = { }; MODULE_DEVICE_TABLE(platform, mxs_auart_devtype); -static struct of_device_id mxs_auart_dt_ids[] = { +static const struct of_device_id mxs_auart_dt_ids[] = { { .compatible = "fsl,imx28-auart", .data = &mxs_auart_devtype[IMX28_AUART] diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c index 33fb94f78967..d8c4eea23b7c 100644 --- a/drivers/tty/serial/of_serial.c +++ b/drivers/tty/serial/of_serial.c @@ -155,7 +155,7 @@ out: /* * Try to register a serial port */ -static struct of_device_id of_platform_serial_table[]; +static const struct of_device_id of_platform_serial_table[]; static int of_platform_serial_probe(struct platform_device *ofdev) { const struct of_device_id *match; @@ -320,7 +320,7 @@ static SIMPLE_DEV_PM_OPS(of_serial_pm_ops, of_serial_suspend, of_serial_resume); /* * A few common types, add more as needed. */ -static struct of_device_id of_platform_serial_table[] = { +static const struct of_device_id of_platform_serial_table[] = { { .compatible = "ns8250", .data = (void *)PORT_8250, }, { .compatible = "ns16450", .data = (void *)PORT_16450, }, { .compatible = "ns16550a", .data = (void *)PORT_16550A, }, diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c index 8f515799c9c1..e156e39d620c 100644 --- a/drivers/tty/serial/pmac_zilog.c +++ b/drivers/tty/serial/pmac_zilog.c @@ -1846,7 +1846,7 @@ static int __init pmz_register(void) #ifdef CONFIG_PPC_PMAC -static struct of_device_id pmz_match[] = +static const struct of_device_id pmz_match[] = { { .name = "ch-a", diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c index d5d062694bd3..9becba654892 100644 --- a/drivers/tty/serial/pxa.c +++ b/drivers/tty/serial/pxa.c @@ -824,7 +824,7 @@ static const struct dev_pm_ops serial_pxa_pm_ops = { }; #endif -static struct of_device_id serial_pxa_dt_ids[] = { +static const struct of_device_id serial_pxa_dt_ids[] = { { .compatible = "mrvl,pxa-uart", }, { .compatible = "mrvl,mmp-uart", }, {} diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index 48e6e41636b2..1d5ea3964ee5 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -1251,7 +1251,7 @@ static struct tegra_uart_chip_data tegra30_uart_chip_data = { .support_clk_src_div = true, }; -static struct of_device_id tegra_uart_of_match[] = { +static const struct of_device_id tegra_uart_of_match[] = { { .compatible = "nvidia,tegra30-hsuart", .data = &tegra30_uart_chip_data, diff --git a/drivers/tty/serial/sirfsoc_uart.c b/drivers/tty/serial/sirfsoc_uart.c index 27ed0e960880..9de3eabe5737 100644 --- a/drivers/tty/serial/sirfsoc_uart.c +++ b/drivers/tty/serial/sirfsoc_uart.c @@ -1269,7 +1269,7 @@ static struct uart_driver sirfsoc_uart_drv = { #endif }; -static struct of_device_id sirfsoc_uart_ids[] = { +static const struct of_device_id sirfsoc_uart_ids[] = { { .compatible = "sirf,prima2-uart", .data = &sirfsoc_uart,}, { .compatible = "sirf,atlas7-uart", .data = &sirfsoc_uart}, { .compatible = "sirf,prima2-usp-uart", .data = &sirfsoc_usp}, diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c index 712b03a076b8..d625664ce1b5 100644 --- a/drivers/tty/serial/st-asc.c +++ b/drivers/tty/serial/st-asc.c @@ -720,7 +720,7 @@ static struct asc_port *asc_of_get_asc_port(struct platform_device *pdev) } #ifdef CONFIG_OF -static struct of_device_id asc_match[] = { +static const struct of_device_id asc_match[] = { { .compatible = "st,asc", }, {}, }; diff --git a/drivers/tty/serial/uartlite.c b/drivers/tty/serial/uartlite.c index 189f52e3111f..708eead850b0 100644 --- a/drivers/tty/serial/uartlite.c +++ b/drivers/tty/serial/uartlite.c @@ -622,7 +622,7 @@ static int ulite_release(struct device *dev) #if defined(CONFIG_OF) /* Match table for of_platform binding */ -static struct of_device_id ulite_of_match[] = { +static const struct of_device_id ulite_of_match[] = { { .compatible = "xlnx,opb-uartlite-1.00.b", }, { .compatible = "xlnx,xps-uartlite-1.00.a", }, {} diff --git a/drivers/tty/serial/ucc_uart.c b/drivers/tty/serial/ucc_uart.c index 14d10fcfd210..7d2532b23969 100644 --- a/drivers/tty/serial/ucc_uart.c +++ b/drivers/tty/serial/ucc_uart.c @@ -1473,7 +1473,7 @@ static int ucc_uart_remove(struct platform_device *ofdev) return 0; } -static struct of_device_id ucc_uart_match[] = { +static const struct of_device_id ucc_uart_match[] = { { .type = "serial", .compatible = "ucc_uart", diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 8f9c5430f470..09258de6947e 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1459,7 +1459,7 @@ static int cdns_uart_remove(struct platform_device *pdev) } /* Match table for of_platform binding */ -static struct of_device_id cdns_uart_of_match[] = { +static const struct of_device_id cdns_uart_of_match[] = { { .compatible = "xlnx,xuartps", }, { .compatible = "cdns,uart-r1p8", }, {} -- cgit From 5ef86b74209db33c133b5f18738dd8f3189b63a1 Mon Sep 17 00:00:00 2001 From: Ken Xue Date: Mon, 9 Mar 2015 17:10:13 +0800 Subject: serial: 8250_dw: add support for AMD SOC Carrizo Add ACPI identifier for UART on AMD SOC Carrizo. Signed-off-by: Ken Xue Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index 5a5ecf34b631..d641886b254a 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -634,6 +634,7 @@ static const struct acpi_device_id dw8250_acpi_match[] = { { "80860F0A", 0 }, { "8086228A", 0 }, { "APMC0D08", 0}, + { "AMD0020", 0 }, { }, }; MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match); -- cgit From ee97d0e3f06498487671c23cad4230bf9aa5fd88 Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Sun, 8 Mar 2015 14:30:04 +0000 Subject: serial: 8250: allow specifying iomem size in addition to address This adds a mapsize field to struct uart_port to be used in conjunction with mapbase. If set, it overrides whatever value serial8250_port_size() would otherwise report. Signed-off-by: Mans Rullgard Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 4 ++++ include/linux/serial_core.h | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 9b2de25359d1..e0fb5f053d09 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2722,6 +2722,8 @@ serial8250_pm(struct uart_port *port, unsigned int state, static unsigned int serial8250_port_size(struct uart_8250_port *pt) { + if (pt->port.mapsize) + return pt->port.mapsize; if (pt->port.iotype == UPIO_AU) { if (pt->port.type == PORT_RT2880) return 0x100; @@ -3553,6 +3555,7 @@ int __init early_serial_setup(struct uart_port *port) p->iotype = port->iotype; p->flags = port->flags; p->mapbase = port->mapbase; + p->mapsize = port->mapsize; p->private_data = port->private_data; p->type = port->type; p->line = port->line; @@ -3807,6 +3810,7 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->port.flags = up->port.flags | UPF_BOOT_AUTOCONF; uart->bugs = up->bugs; uart->port.mapbase = up->port.mapbase; + uart->port.mapsize = up->port.mapsize; uart->port.private_data = up->port.private_data; uart->port.fifosize = up->port.fifosize; uart->tx_loadsz = up->tx_loadsz; diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 8aeec4913a9c..34de16840152 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -237,6 +237,7 @@ struct uart_port { unsigned int line; /* port index */ unsigned int minor; resource_size_t mapbase; /* for ioremap */ + resource_size_t mapsize; struct device *dev; /* parent device */ unsigned char hub6; /* this should be in the 8250 driver */ unsigned char suspended; -- cgit From 0787691230d88af8cdfc6d4085957bbf7cec1e5d Mon Sep 17 00:00:00 2001 From: Mans Rullgard Date: Sun, 8 Mar 2015 14:30:05 +0000 Subject: serial: of: set port iomem size from devicetree Make the 8250 driver reserve exactly the mmio region specified in the devicetree. This prevents conflicts between UPIO_AU type UARTs and other devices mapped closer than the default size of 0x1000 (or 0x100 for RT2880). Signed-off-by: Mans Rullgard Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/of_serial.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/serial/of_serial.c b/drivers/tty/serial/of_serial.c index d8c4eea23b7c..aa00154c4a6d 100644 --- a/drivers/tty/serial/of_serial.c +++ b/drivers/tty/serial/of_serial.c @@ -89,6 +89,7 @@ static int of_platform_serial_setup(struct platform_device *ofdev, spin_lock_init(&port->lock); port->mapbase = resource.start; + port->mapsize = resource_size(&resource); /* Check for shifted address mapping */ if (of_property_read_u32(np, "reg-offset", &prop) == 0) -- cgit From 9646e4fee42d080ad484eef005691a17ed9cb8e7 Mon Sep 17 00:00:00 2001 From: Thomas Betker Date: Wed, 11 Mar 2015 22:39:25 +0100 Subject: serial: xuartps: Fix register space size. The register space size is 0x1000, and this value [not 0xfff] should be provided to request_mem_region(), ioremap(), etc. Signed-off-by: Thomas Betker Reviewed-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/xilinx_uartps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 09258de6947e..b8fbd4767c17 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -37,7 +37,7 @@ #define CDNS_UART_MINOR 0 /* works best with devtmpfs */ #define CDNS_UART_NR_PORTS 2 #define CDNS_UART_FIFO_SIZE 64 /* FIFO size */ -#define CDNS_UART_REGISTER_SPACE 0xFFF +#define CDNS_UART_REGISTER_SPACE 0x1000 #define cdns_uart_readl(offset) ioread32(port->membase + offset) #define cdns_uart_writel(val, offset) iowrite32(val, port->membase + offset) -- cgit From 6db6df0e4a1b913810fc9063bbb332476ce316b7 Mon Sep 17 00:00:00 2001 From: Thomas Betker Date: Wed, 11 Mar 2015 22:39:26 +0100 Subject: serial: xuartps: Fix cdns_uart_port[] definition. The code assumes that the array cdns_uart_port[] has dimension CDNS_UART_NR_PORTS, so let us define it this way. Signed-off-by: Thomas Betker Reviewed-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/xilinx_uartps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index b8fbd4767c17..b0c2862a3daf 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1010,7 +1010,7 @@ static struct uart_ops cdns_uart_ops = { #endif }; -static struct uart_port cdns_uart_port[2]; +static struct uart_port cdns_uart_port[CDNS_UART_NR_PORTS]; /** * cdns_uart_get_port - Configure the port from platform device resource info -- cgit From 0c39a467e7ba68a0d94439c1ebe260dc5b26302b Mon Sep 17 00:00:00 2001 From: Thomas Betker Date: Wed, 11 Mar 2015 22:39:27 +0100 Subject: serial: xuartps: Fix iobase use. cdns_uart_get_port() sets port->iobase = 1 to "mark port in use", but this "in use" condition is not checked anywhere else in the code. So remove the line, keeping port->iobase = 0 (which also makes more sense). Signed-off-by: Thomas Betker Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/xilinx_uartps.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index b0c2862a3daf..50643a94c5c1 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1038,7 +1038,6 @@ static struct uart_port *cdns_uart_get_port(int id) /* At this point, we've got an empty uart_port struct, initialize it */ spin_lock_init(&port->lock); port->membase = NULL; - port->iobase = 1; /* mark port in use */ port->irq = 0; port->type = PORT_UNKNOWN; port->iotype = UPIO_MEM32; -- cgit From 19f22efdb653642814e6c8710fca974c1dbe7cfa Mon Sep 17 00:00:00 2001 From: Thomas Betker Date: Thu, 12 Mar 2015 22:11:59 +0100 Subject: serial: xuartps: Get rid of register access macros. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Get rid of cdns_uart_readl() and cdns_uart_writel() and just call readl() and writel() directly. Most of the patch was created by search-and-replace (I had to convert a few lines manually, and break some lines longer than 80 columns): * s/cdns_uart_readl(/readl(port->membase + /g * s/cdns_uart_writel(\([^,]*\),/writel(\1, port->membase +/g Signed-off-by: Thomas Betker Acked-by: Sören Brinkmann Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/xilinx_uartps.c | 230 +++++++++++++++++++------------------ 1 file changed, 118 insertions(+), 112 deletions(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 50643a94c5c1..556062a438cf 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -39,9 +39,6 @@ #define CDNS_UART_FIFO_SIZE 64 /* FIFO size */ #define CDNS_UART_REGISTER_SPACE 0x1000 -#define cdns_uart_readl(offset) ioread32(port->membase + offset) -#define cdns_uart_writel(val, offset) iowrite32(val, port->membase + offset) - /* Rx Trigger level */ static int rx_trigger_level = 56; module_param(rx_trigger_level, uint, S_IRUGO); @@ -195,7 +192,7 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) /* Read the interrupt status register to determine which * interrupt(s) is/are active. */ - isrstatus = cdns_uart_readl(CDNS_UART_ISR_OFFSET); + isrstatus = readl(port->membase + CDNS_UART_ISR_OFFSET); /* * There is no hardware break detection, so we interpret framing @@ -203,14 +200,15 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) * there's another non-zero byte at the end of the sequence. */ if (isrstatus & CDNS_UART_IXR_FRAMING) { - while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & CDNS_UART_SR_RXEMPTY)) { - if (!cdns_uart_readl(CDNS_UART_FIFO_OFFSET)) { + if (!readl(port->membase + CDNS_UART_FIFO_OFFSET)) { port->read_status_mask |= CDNS_UART_IXR_BRK; isrstatus &= ~CDNS_UART_IXR_FRAMING; } } - cdns_uart_writel(CDNS_UART_IXR_FRAMING, CDNS_UART_ISR_OFFSET); + writel(CDNS_UART_IXR_FRAMING, + port->membase + CDNS_UART_ISR_OFFSET); } /* drop byte with parity error if IGNPAR specified */ @@ -223,9 +221,9 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) if ((isrstatus & CDNS_UART_IXR_TOUT) || (isrstatus & CDNS_UART_IXR_RXTRIG)) { /* Receive Timeout Interrupt */ - while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) & - CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) { - data = cdns_uart_readl(CDNS_UART_FIFO_OFFSET); + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & + CDNS_UART_SR_RXEMPTY)) { + data = readl(port->membase + CDNS_UART_FIFO_OFFSET); /* Non-NULL byte after BREAK is garbage (99%) */ if (data && (port->read_status_mask & @@ -275,8 +273,8 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) /* Dispatch an appropriate handler */ if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY) { if (uart_circ_empty(&port->state->xmit)) { - cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, - CDNS_UART_IDR_OFFSET); + writel(CDNS_UART_IXR_TXEMPTY, + port->membase + CDNS_UART_IDR_OFFSET); } else { numbytes = port->fifosize; /* Break if no more data available in the UART buffer */ @@ -287,9 +285,9 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) * and write it to the cdns_uart's TX_FIFO * register. */ - cdns_uart_writel( - port->state->xmit.buf[port->state->xmit. - tail], CDNS_UART_FIFO_OFFSET); + writel(port->state->xmit.buf[ + port->state->xmit.tail], + port->membase + CDNS_UART_FIFO_OFFSET); port->icount.tx++; @@ -307,7 +305,7 @@ static irqreturn_t cdns_uart_isr(int irq, void *dev_id) } } - cdns_uart_writel(isrstatus, CDNS_UART_ISR_OFFSET); + writel(isrstatus, port->membase + CDNS_UART_ISR_OFFSET); /* be sure to release the lock and tty before leaving */ spin_unlock_irqrestore(&port->lock, flags); @@ -397,14 +395,14 @@ static unsigned int cdns_uart_set_baud_rate(struct uart_port *port, &div8); /* Write new divisors to hardware */ - mreg = cdns_uart_readl(CDNS_UART_MR_OFFSET); + mreg = readl(port->membase + CDNS_UART_MR_OFFSET); if (div8) mreg |= CDNS_UART_MR_CLKSEL; else mreg &= ~CDNS_UART_MR_CLKSEL; - cdns_uart_writel(mreg, CDNS_UART_MR_OFFSET); - cdns_uart_writel(cd, CDNS_UART_BAUDGEN_OFFSET); - cdns_uart_writel(bdiv, CDNS_UART_BAUDDIV_OFFSET); + writel(mreg, port->membase + CDNS_UART_MR_OFFSET); + writel(cd, port->membase + CDNS_UART_BAUDGEN_OFFSET); + writel(bdiv, port->membase + CDNS_UART_BAUDDIV_OFFSET); cdns_uart->baud = baud; return calc_baud; @@ -451,9 +449,9 @@ static int cdns_uart_clk_notifier_cb(struct notifier_block *nb, spin_lock_irqsave(&cdns_uart->port->lock, flags); /* Disable the TX and RX to set baud rate */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); spin_unlock_irqrestore(&cdns_uart->port->lock, flags); @@ -478,11 +476,11 @@ static int cdns_uart_clk_notifier_cb(struct notifier_block *nb, spin_lock_irqsave(&cdns_uart->port->lock, flags); /* Set TX/RX Reset */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); - while (cdns_uart_readl(CDNS_UART_CR_OFFSET) & + while (readl(port->membase + CDNS_UART_CR_OFFSET) & (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST)) cpu_relax(); @@ -491,11 +489,11 @@ static int cdns_uart_clk_notifier_cb(struct notifier_block *nb, * enable bit and RX enable bit to enable the transmitter and * receiver. */ - cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET); - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + writel(rx_timeout, port->membase + CDNS_UART_RXTOUT_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS); ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); spin_unlock_irqrestore(&cdns_uart->port->lock, flags); @@ -517,14 +515,14 @@ static void cdns_uart_start_tx(struct uart_port *port) if (uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port)) return; - status = cdns_uart_readl(CDNS_UART_CR_OFFSET); + status = readl(port->membase + CDNS_UART_CR_OFFSET); /* Set the TX enable bit and clear the TX disable bit to enable the * transmitter. */ - cdns_uart_writel((status & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN, - CDNS_UART_CR_OFFSET); + writel((status & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN, + port->membase + CDNS_UART_CR_OFFSET); - while (numbytes-- && ((cdns_uart_readl(CDNS_UART_SR_OFFSET) & + while (numbytes-- && ((readl(port->membase + CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXFULL)) != CDNS_UART_SR_TXFULL) { /* Break if no more data available in the UART buffer */ if (uart_circ_empty(&port->state->xmit)) @@ -533,9 +531,8 @@ static void cdns_uart_start_tx(struct uart_port *port) /* Get the data from the UART circular buffer and * write it to the cdns_uart's TX_FIFO register. */ - cdns_uart_writel( - port->state->xmit.buf[port->state->xmit.tail], - CDNS_UART_FIFO_OFFSET); + writel(port->state->xmit.buf[port->state->xmit.tail], + port->membase + CDNS_UART_FIFO_OFFSET); port->icount.tx++; /* Adjust the tail of the UART buffer and wrap @@ -544,9 +541,9 @@ static void cdns_uart_start_tx(struct uart_port *port) port->state->xmit.tail = (port->state->xmit.tail + 1) & (UART_XMIT_SIZE - 1); } - cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, CDNS_UART_ISR_OFFSET); + writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_ISR_OFFSET); /* Enable the TX Empty interrupt */ - cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, CDNS_UART_IER_OFFSET); + writel(CDNS_UART_IXR_TXEMPTY, port->membase + CDNS_UART_IER_OFFSET); if (uart_circ_chars_pending(&port->state->xmit) < WAKEUP_CHARS) uart_write_wakeup(port); @@ -560,10 +557,10 @@ static void cdns_uart_stop_tx(struct uart_port *port) { unsigned int regval; - regval = cdns_uart_readl(CDNS_UART_CR_OFFSET); + regval = readl(port->membase + CDNS_UART_CR_OFFSET); regval |= CDNS_UART_CR_TX_DIS; /* Disable the transmitter */ - cdns_uart_writel(regval, CDNS_UART_CR_OFFSET); + writel(regval, port->membase + CDNS_UART_CR_OFFSET); } /** @@ -574,10 +571,10 @@ static void cdns_uart_stop_rx(struct uart_port *port) { unsigned int regval; - regval = cdns_uart_readl(CDNS_UART_CR_OFFSET); + regval = readl(port->membase + CDNS_UART_CR_OFFSET); regval |= CDNS_UART_CR_RX_DIS; /* Disable the receiver */ - cdns_uart_writel(regval, CDNS_UART_CR_OFFSET); + writel(regval, port->membase + CDNS_UART_CR_OFFSET); } /** @@ -590,7 +587,8 @@ static unsigned int cdns_uart_tx_empty(struct uart_port *port) { unsigned int status; - status = cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY; + status = readl(port->membase + CDNS_UART_SR_OFFSET) & + CDNS_UART_SR_TXEMPTY; return status ? TIOCSER_TEMT : 0; } @@ -607,15 +605,15 @@ static void cdns_uart_break_ctl(struct uart_port *port, int ctl) spin_lock_irqsave(&port->lock, flags); - status = cdns_uart_readl(CDNS_UART_CR_OFFSET); + status = readl(port->membase + CDNS_UART_CR_OFFSET); if (ctl == -1) - cdns_uart_writel(CDNS_UART_CR_STARTBRK | status, - CDNS_UART_CR_OFFSET); + writel(CDNS_UART_CR_STARTBRK | status, + port->membase + CDNS_UART_CR_OFFSET); else { if ((status & CDNS_UART_CR_STOPBRK) == 0) - cdns_uart_writel(CDNS_UART_CR_STOPBRK | status, - CDNS_UART_CR_OFFSET); + writel(CDNS_UART_CR_STOPBRK | status, + port->membase + CDNS_UART_CR_OFFSET); } spin_unlock_irqrestore(&port->lock, flags); } @@ -638,17 +636,18 @@ static void cdns_uart_set_termios(struct uart_port *port, spin_lock_irqsave(&port->lock, flags); /* Wait for the transmit FIFO to empty before making changes */ - if (!(cdns_uart_readl(CDNS_UART_CR_OFFSET) & CDNS_UART_CR_TX_DIS)) { - while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & + if (!(readl(port->membase + CDNS_UART_CR_OFFSET) & + CDNS_UART_CR_TX_DIS)) { + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY)) { cpu_relax(); } } /* Disable the TX and RX to set baud rate */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); /* * Min baud rate = 6bps and Max Baud Rate is 10Mbps for 100Mhz clk @@ -667,20 +666,20 @@ static void cdns_uart_set_termios(struct uart_port *port, uart_update_timeout(port, termios->c_cflag, baud); /* Set TX/RX Reset */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); /* * Clear the RX disable and TX disable bits and then set the TX enable * bit and RX enable bit to enable the transmitter and receiver. */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS); ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); - cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET); + writel(rx_timeout, port->membase + CDNS_UART_RXTOUT_OFFSET); port->read_status_mask = CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_TOUT; @@ -700,7 +699,7 @@ static void cdns_uart_set_termios(struct uart_port *port, CDNS_UART_IXR_TOUT | CDNS_UART_IXR_PARITY | CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN; - mode_reg = cdns_uart_readl(CDNS_UART_MR_OFFSET); + mode_reg = readl(port->membase + CDNS_UART_MR_OFFSET); /* Handling Data Size */ switch (termios->c_cflag & CSIZE) { @@ -741,7 +740,7 @@ static void cdns_uart_set_termios(struct uart_port *port, cval |= CDNS_UART_MR_PARITY_NONE; } cval |= mode_reg & 1; - cdns_uart_writel(cval, CDNS_UART_MR_OFFSET); + writel(cval, port->membase + CDNS_UART_MR_OFFSET); spin_unlock_irqrestore(&port->lock, flags); } @@ -762,52 +761,53 @@ static int cdns_uart_startup(struct uart_port *port) return retval; /* Disable the TX and RX */ - cdns_uart_writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS, - CDNS_UART_CR_OFFSET); + writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS, + port->membase + CDNS_UART_CR_OFFSET); /* Set the Control Register with TX/RX Enable, TX/RX Reset, * no break chars. */ - cdns_uart_writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST, - CDNS_UART_CR_OFFSET); + writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST, + port->membase + CDNS_UART_CR_OFFSET); - status = cdns_uart_readl(CDNS_UART_CR_OFFSET); + status = readl(port->membase + CDNS_UART_CR_OFFSET); /* Clear the RX disable and TX disable bits and then set the TX enable * bit and RX enable bit to enable the transmitter and receiver. */ - cdns_uart_writel((status & ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS)) + writel((status & ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS)) | (CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN | - CDNS_UART_CR_STOPBRK), CDNS_UART_CR_OFFSET); + CDNS_UART_CR_STOPBRK), + port->membase + CDNS_UART_CR_OFFSET); /* Set the Mode Register with normal mode,8 data bits,1 stop bit, * no parity. */ - cdns_uart_writel(CDNS_UART_MR_CHMODE_NORM | CDNS_UART_MR_STOPMODE_1_BIT + writel(CDNS_UART_MR_CHMODE_NORM | CDNS_UART_MR_STOPMODE_1_BIT | CDNS_UART_MR_PARITY_NONE | CDNS_UART_MR_CHARLEN_8_BIT, - CDNS_UART_MR_OFFSET); + port->membase + CDNS_UART_MR_OFFSET); /* * Set the RX FIFO Trigger level to use most of the FIFO, but it * can be tuned with a module parameter */ - cdns_uart_writel(rx_trigger_level, CDNS_UART_RXWM_OFFSET); + writel(rx_trigger_level, port->membase + CDNS_UART_RXWM_OFFSET); /* * Receive Timeout register is enabled but it * can be tuned with a module parameter */ - cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET); + writel(rx_timeout, port->membase + CDNS_UART_RXTOUT_OFFSET); /* Clear out any pending interrupts before enabling them */ - cdns_uart_writel(cdns_uart_readl(CDNS_UART_ISR_OFFSET), - CDNS_UART_ISR_OFFSET); + writel(readl(port->membase + CDNS_UART_ISR_OFFSET), + port->membase + CDNS_UART_ISR_OFFSET); /* Set the Interrupt Registers with desired interrupts */ - cdns_uart_writel(CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_PARITY | + writel(CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_PARITY | CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT, - CDNS_UART_IER_OFFSET); + port->membase + CDNS_UART_IER_OFFSET); return retval; } @@ -821,12 +821,12 @@ static void cdns_uart_shutdown(struct uart_port *port) int status; /* Disable interrupts */ - status = cdns_uart_readl(CDNS_UART_IMR_OFFSET); - cdns_uart_writel(status, CDNS_UART_IDR_OFFSET); + status = readl(port->membase + CDNS_UART_IMR_OFFSET); + writel(status, port->membase + CDNS_UART_IDR_OFFSET); /* Disable the TX and RX */ - cdns_uart_writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS, - CDNS_UART_CR_OFFSET); + writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS, + port->membase + CDNS_UART_CR_OFFSET); free_irq(port->irq, port); } @@ -928,7 +928,7 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) { u32 val; - val = cdns_uart_readl(CDNS_UART_MODEMCR_OFFSET); + val = readl(port->membase + CDNS_UART_MODEMCR_OFFSET); val &= ~(CDNS_UART_MODEMCR_RTS | CDNS_UART_MODEMCR_DTR); @@ -937,7 +937,7 @@ static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl) if (mctrl & TIOCM_DTR) val |= CDNS_UART_MODEMCR_DTR; - cdns_uart_writel(val, CDNS_UART_MODEMCR_OFFSET); + writel(val, port->membase + CDNS_UART_MODEMCR_OFFSET); } #ifdef CONFIG_CONSOLE_POLL @@ -947,17 +947,18 @@ static int cdns_uart_poll_get_char(struct uart_port *port) int c; /* Disable all interrupts */ - imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET); - cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET); + imr = readl(port->membase + CDNS_UART_IMR_OFFSET); + writel(imr, port->membase + CDNS_UART_IDR_OFFSET); /* Check if FIFO is empty */ - if (cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_RXEMPTY) + if (readl(port->membase + CDNS_UART_SR_OFFSET) & CDNS_UART_SR_RXEMPTY) c = NO_POLL_CHAR; else /* Read a character */ - c = (unsigned char) cdns_uart_readl(CDNS_UART_FIFO_OFFSET); + c = (unsigned char) readl( + port->membase + CDNS_UART_FIFO_OFFSET); /* Enable interrupts */ - cdns_uart_writel(imr, CDNS_UART_IER_OFFSET); + writel(imr, port->membase + CDNS_UART_IER_OFFSET); return c; } @@ -967,22 +968,24 @@ static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c) u32 imr; /* Disable all interrupts */ - imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET); - cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET); + imr = readl(port->membase + CDNS_UART_IMR_OFFSET); + writel(imr, port->membase + CDNS_UART_IDR_OFFSET); /* Wait until FIFO is empty */ - while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY)) + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & + CDNS_UART_SR_TXEMPTY)) cpu_relax(); /* Write a character */ - cdns_uart_writel(c, CDNS_UART_FIFO_OFFSET); + writel(c, port->membase + CDNS_UART_FIFO_OFFSET); /* Wait until FIFO is empty */ - while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY)) + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & + CDNS_UART_SR_TXEMPTY)) cpu_relax(); /* Enable interrupts */ - cdns_uart_writel(imr, CDNS_UART_IER_OFFSET); + writel(imr, port->membase + CDNS_UART_IER_OFFSET); return; } @@ -1056,8 +1059,8 @@ static struct uart_port *cdns_uart_get_port(int id) */ static void cdns_uart_console_wait_tx(struct uart_port *port) { - while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY) - != CDNS_UART_SR_TXEMPTY) + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & + CDNS_UART_SR_TXEMPTY)) barrier(); } @@ -1069,7 +1072,7 @@ static void cdns_uart_console_wait_tx(struct uart_port *port) static void cdns_uart_console_putchar(struct uart_port *port, int ch) { cdns_uart_console_wait_tx(port); - cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET); + writel(ch, port->membase + CDNS_UART_FIFO_OFFSET); } static void cdns_early_write(struct console *con, const char *s, unsigned n) @@ -1111,24 +1114,24 @@ static void cdns_uart_console_write(struct console *co, const char *s, spin_lock_irqsave(&port->lock, flags); /* save and disable interrupt */ - imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET); - cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET); + imr = readl(port->membase + CDNS_UART_IMR_OFFSET); + writel(imr, port->membase + CDNS_UART_IDR_OFFSET); /* * Make sure that the tx part is enabled. Set the TX enable bit and * clear the TX disable bit to enable the transmitter. */ - ctrl = cdns_uart_readl(CDNS_UART_CR_OFFSET); - cdns_uart_writel((ctrl & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN, - CDNS_UART_CR_OFFSET); + ctrl = readl(port->membase + CDNS_UART_CR_OFFSET); + writel((ctrl & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN, + port->membase + CDNS_UART_CR_OFFSET); uart_console_write(port, s, count, cdns_uart_console_putchar); cdns_uart_console_wait_tx(port); - cdns_uart_writel(ctrl, CDNS_UART_CR_OFFSET); + writel(ctrl, port->membase + CDNS_UART_CR_OFFSET); /* restore interrupt state */ - cdns_uart_writel(imr, CDNS_UART_IER_OFFSET); + writel(imr, port->membase + CDNS_UART_IER_OFFSET); if (locked) spin_unlock_irqrestore(&port->lock, flags); @@ -1240,13 +1243,14 @@ static int cdns_uart_suspend(struct device *device) spin_lock_irqsave(&port->lock, flags); /* Empty the receive FIFO 1st before making changes */ - while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & + while (!(readl(port->membase + CDNS_UART_SR_OFFSET) & CDNS_UART_SR_RXEMPTY)) - cdns_uart_readl(CDNS_UART_FIFO_OFFSET); + readl(port->membase + CDNS_UART_FIFO_OFFSET); /* set RX trigger level to 1 */ - cdns_uart_writel(1, CDNS_UART_RXWM_OFFSET); + writel(1, port->membase + CDNS_UART_RXWM_OFFSET); /* disable RX timeout interrups */ - cdns_uart_writel(CDNS_UART_IXR_TOUT, CDNS_UART_IDR_OFFSET); + writel(CDNS_UART_IXR_TOUT, + port->membase + CDNS_UART_IDR_OFFSET); spin_unlock_irqrestore(&port->lock, flags); } @@ -1285,28 +1289,30 @@ static int cdns_uart_resume(struct device *device) spin_lock_irqsave(&port->lock, flags); /* Set TX/RX Reset */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); - while (cdns_uart_readl(CDNS_UART_CR_OFFSET) & + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); + while (readl(port->membase + CDNS_UART_CR_OFFSET) & (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST)) cpu_relax(); /* restore rx timeout value */ - cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET); + writel(rx_timeout, port->membase + CDNS_UART_RXTOUT_OFFSET); /* Enable Tx/Rx */ - ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET); + ctrl_reg = readl(port->membase + CDNS_UART_CR_OFFSET); ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS); ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN; - cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET); + writel(ctrl_reg, port->membase + CDNS_UART_CR_OFFSET); spin_unlock_irqrestore(&port->lock, flags); } else { spin_lock_irqsave(&port->lock, flags); /* restore original rx trigger level */ - cdns_uart_writel(rx_trigger_level, CDNS_UART_RXWM_OFFSET); + writel(rx_trigger_level, + port->membase + CDNS_UART_RXWM_OFFSET); /* enable RX timeout interrupt */ - cdns_uart_writel(CDNS_UART_IXR_TOUT, CDNS_UART_IER_OFFSET); + writel(CDNS_UART_IXR_TOUT, + port->membase + CDNS_UART_IER_OFFSET); spin_unlock_irqrestore(&port->lock, flags); } -- cgit From 136debf707d2b3cd8e74d0fff8e29d11a78bf5c2 Mon Sep 17 00:00:00 2001 From: Thomas Betker Date: Wed, 11 Mar 2015 22:39:28 +0100 Subject: serial: xuartps: Fix check in console_setup(). cdns_uart_console_setup() checks port->mapbase != 0, but the port may not be initialized yet even if this condition is met [e.g., ioremap() may have failed]. Check port->membase != NULL instead, similar to cdns_early_console_setup(). Signed-off-by: Thomas Betker Reviewed-by: Michal Simek Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/xilinx_uartps.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c index 556062a438cf..f218ec658f5d 100644 --- a/drivers/tty/serial/xilinx_uartps.c +++ b/drivers/tty/serial/xilinx_uartps.c @@ -1155,7 +1155,7 @@ static int __init cdns_uart_console_setup(struct console *co, char *options) if (co->index < 0 || co->index >= CDNS_UART_NR_PORTS) return -EINVAL; - if (!port->mapbase) { + if (!port->membase) { pr_debug("console on " CDNS_UART_TTY_NAME "%i not present\n", co->index); return -ENODEV; -- cgit From a666b54adabc7dd40d754671a26996e6c985ae1b Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 17 Mar 2015 12:17:28 +0300 Subject: serial: jsm: some off by one bugs "brd->nasync" amd "brd->maxports" are the same. They hold the number of filled out channels in the brd->channels[] array. These tests should be ">=" instead of ">" so that we don't read one element past the end. Signed-off-by: Dan Carpenter Acked-by: Thadeu Lima de Souza Cascardo Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/jsm/jsm_cls.c | 2 +- drivers/tty/serial/jsm/jsm_neo.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/tty/serial/jsm/jsm_cls.c b/drivers/tty/serial/jsm/jsm_cls.c index bfb0681195b6..4eb12a9cae76 100644 --- a/drivers/tty/serial/jsm/jsm_cls.c +++ b/drivers/tty/serial/jsm/jsm_cls.c @@ -570,7 +570,7 @@ static inline void cls_parse_isr(struct jsm_board *brd, uint port) * verified in the interrupt routine. */ - if (port > brd->nasync) + if (port >= brd->nasync) return; ch = brd->channels[port]; diff --git a/drivers/tty/serial/jsm/jsm_neo.c b/drivers/tty/serial/jsm/jsm_neo.c index 7291c2117daa..932b2accd06f 100644 --- a/drivers/tty/serial/jsm/jsm_neo.c +++ b/drivers/tty/serial/jsm/jsm_neo.c @@ -724,7 +724,7 @@ static inline void neo_parse_isr(struct jsm_board *brd, u32 port) if (!brd) return; - if (port > brd->maxports) + if (port >= brd->maxports) return; ch = brd->channels[port]; @@ -840,7 +840,7 @@ static inline void neo_parse_lsr(struct jsm_board *brd, u32 port) if (!brd) return; - if (port > brd->maxports) + if (port >= brd->maxports) return; ch = brd->channels[port]; @@ -1180,7 +1180,7 @@ static irqreturn_t neo_intr(int irq, void *voidbrd) */ /* Verify the port is in range. */ - if (port > brd->nasync) + if (port >= brd->nasync) continue; ch = brd->channels[port]; -- cgit From 49708c9e6cbb3c534677f429053bd18c2e948069 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Thu, 12 Mar 2015 16:23:59 +0100 Subject: tty: cpm_uart: replace CONFIG_8xx by CONFIG_CPM1 Two config options exist to define powerpc MPC8xx: * CONFIG_PPC_8xx * CONFIG_8xx In addition, CONFIG_PPC_8xx also defines CONFIG_CPM1 as communication co-processor arch/powerpc/platforms/Kconfig.cputype has contained the following comment about CONFIG_8xx item for some years: "# this is temp to handle compat with arch=ppc" It looks like not many places still have that old CONFIG_8xx used, so it is likely to be a good time to get rid of it completely ? Signed-off-by: Christophe Leroy Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/Kconfig | 2 +- drivers/tty/serial/cpm_uart/Makefile | 2 +- drivers/tty/serial/cpm_uart/cpm_uart.h | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 79ae58682adc..f8120c1bde14 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -868,7 +868,7 @@ config SERIAL_PMACZILOG_CONSOLE config SERIAL_CPM tristate "CPM SCC/SMC serial port support" - depends on CPM2 || 8xx + depends on CPM2 || CPM1 select SERIAL_CORE help This driver supports the SCC and SMC serial ports on Motorola diff --git a/drivers/tty/serial/cpm_uart/Makefile b/drivers/tty/serial/cpm_uart/Makefile index e072724ea754..896a5d57881c 100644 --- a/drivers/tty/serial/cpm_uart/Makefile +++ b/drivers/tty/serial/cpm_uart/Makefile @@ -6,6 +6,6 @@ obj-$(CONFIG_SERIAL_CPM) += cpm_uart.o # Select the correct platform objects. cpm_uart-objs-$(CONFIG_CPM2) += cpm_uart_cpm2.o -cpm_uart-objs-$(CONFIG_8xx) += cpm_uart_cpm1.o +cpm_uart-objs-$(CONFIG_CPM1) += cpm_uart_cpm1.o cpm_uart-objs := cpm_uart_core.o $(cpm_uart-objs-y) diff --git a/drivers/tty/serial/cpm_uart/cpm_uart.h b/drivers/tty/serial/cpm_uart/cpm_uart.h index cf34d26ff6cd..0ad027b95873 100644 --- a/drivers/tty/serial/cpm_uart/cpm_uart.h +++ b/drivers/tty/serial/cpm_uart/cpm_uart.h @@ -19,7 +19,7 @@ #if defined(CONFIG_CPM2) #include "cpm_uart_cpm2.h" -#elif defined(CONFIG_8xx) +#elif defined(CONFIG_CPM1) #include "cpm_uart_cpm1.h" #endif -- cgit From 21947ba654a685ab48f2d4089c5c2d27443c2d0d Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 13 Mar 2015 18:51:12 +0200 Subject: serial: 8250_pci: replace switch-case by formula This patch replaces a switch-case by a formula using rational best approximation that does necessary calculations for byt_set_termios(). Below is a list of the calculations done for all defined baud rates. Each line in a format: 1) numerator, 2) denominator, 3) prescaler, 4) Fuart, 5) port UART clock, 6) list of baud rates with DLAB values. 4 5 16 80000000 80000000 2500000(2) 14 25 16 56000000 56000000 3500000(1) 16 25 16 64000000 64000000 500000(8),1000000(4),2000000(2), 4000000(1) 24 25 16 96000000 96000000 1500000(4),3000000(2) 2180 3103 16 70254592 70254592 134(32768) 2304 3125 16 73728000 73728000 576000(8),1152000(4) 8192 15625 16 52428800 52428800 50(65536),200(16384) 9216 15625 16 58982400 58982400 1800(2048),57600(64),115200(32), 230400(16),460800(8),921600(4),1843200(2) 12288 15625 16 78643200 78643200 75(65536),150(32768),300(16384), 600(8192),1200(4096),2400(2048), 4800(1024),9600(512),19200(256),38400(128) 9893 17154 16 57671680 57671680 110(32768) Signed-off-by: Andy Shevchenko Reviewed-by: Peter Hurley Reviewed-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 40 +++++++++----------------------------- drivers/tty/serial/8250/Kconfig | 1 + 2 files changed, 10 insertions(+), 31 deletions(-) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 495da0643278..7e0519923eb5 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include @@ -1393,45 +1394,22 @@ byt_set_termios(struct uart_port *p, struct ktermios *termios, struct ktermios *old) { unsigned int baud = tty_termios_baud_rate(termios); - unsigned int m, n; + unsigned long fref = 100000000, fuart = baud * 16; + unsigned long w = BIT(15) - 1; + unsigned long m, n; u32 reg; + /* Get Fuart closer to Fref */ + fuart *= rounddown_pow_of_two(fref / fuart); + /* * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the * dividers must be adjusted. * * uartclk = (m / n) * 100 MHz, where m <= n */ - switch (baud) { - case 500000: - case 1000000: - case 2000000: - case 4000000: - m = 64; - n = 100; - p->uartclk = 64000000; - break; - case 3500000: - m = 56; - n = 100; - p->uartclk = 56000000; - break; - case 1500000: - case 3000000: - m = 48; - n = 100; - p->uartclk = 48000000; - break; - case 2500000: - m = 40; - n = 100; - p->uartclk = 40000000; - break; - default: - m = 2304; - n = 3125; - p->uartclk = 73728000; - } + rational_best_approximation(fuart, fref, w, w, &m, &n); + p->uartclk = fuart; /* Reset the clock */ reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT); diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig index 6f7f2d753def..c35070356528 100644 --- a/drivers/tty/serial/8250/Kconfig +++ b/drivers/tty/serial/8250/Kconfig @@ -108,6 +108,7 @@ config SERIAL_8250_PCI tristate "8250/16550 PCI device support" if EXPERT depends on SERIAL_8250 && PCI default SERIAL_8250 + select RATIONAL help This builds standard PCI serial support. You may be able to disable this feature if you only need legacy serial support. -- cgit From c1a67b48f6a5878b7ec9f49144faa02f94e965cc Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 13 Mar 2015 18:51:13 +0200 Subject: serial: 8250_pci: replace switch-case by formula for Intel MID This patch replaces a switch-case by a formula using rational best approximation that does necessary calculations for intel_mid_set_termios(). Below is a list of the calculations done for all defined baud rates. Each line in a format: 1) nominator, 2) denominator, 3) prescaler, 4) Fuart, 5) port UART clock, 6) list of baud rates with DLAB values. 24 25 12 48000000 64000000 4000000(1) 49 50 14 49000000 56000000 3500000(1) 4 5 16 40000000 40000000 2500000(1) 16 25 16 32000000 32000000 500000(4),1000000(2),2000000(1) 24 25 16 48000000 48000000 1500000(2),3000000(1) 2304 3125 16 36864000 36864000 576000(4),1152000(2) 8192 15625 16 26214400 26214400 50(32768),200(8192) 9216 15625 16 29491200 29491200 1800(1024),57600(32),115200(16), 230400(8),460800(4),921600(2),1843200(1) 12288 15625 16 39321600 39321600 75(32768),150(16384),300(8192), 600(4096),1200(2048),2400(1024),4800(512), 9600(256),19200(128),38400(64) 45056 78125 16 28835840 28835840 110(16384) 274432 390625 16 35127296 35127296 134(16384) Signed-off-by: Andy Shevchenko Reviewed-by: Peter Hurley Reviewed-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 78 +++++++++++++++++--------------------- 1 file changed, 34 insertions(+), 44 deletions(-) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 7e0519923eb5..0be8dd84f9dc 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1506,60 +1506,50 @@ byt_serial_setup(struct serial_private *priv, #define INTEL_MID_UART_PS 0x30 #define INTEL_MID_UART_MUL 0x34 +#define INTEL_MID_UART_DIV 0x38 -static void intel_mid_set_termios_50M(struct uart_port *p, - struct ktermios *termios, - struct ktermios *old) +static void intel_mid_set_termios(struct uart_port *p, + struct ktermios *termios, + struct ktermios *old, + unsigned long fref) { unsigned int baud = tty_termios_baud_rate(termios); - u32 ps, mul; - - /* - * The uart clk is 50Mhz, and the baud rate come from: - * baud = 50M * MUL / (DIV * PS * DLAB) - * - * For those basic low baud rate we can get the direct - * scalar from 2746800, like 115200 = 2746800/24. For those - * higher baud rate, we handle them case by case, mainly by - * adjusting the MUL/PS registers, and DIV register is kept - * as default value 0x3d09 to make things simple. - */ - - ps = 0x10; - - switch (baud) { - case 500000: - case 1000000: - case 1500000: - case 3000000: - mul = 0x3a98; - p->uartclk = 48000000; - break; - case 2000000: - case 4000000: - mul = 0x2710; - ps = 0x08; - p->uartclk = 64000000; - break; - case 2500000: - mul = 0x30d4; - p->uartclk = 40000000; - break; - case 3500000: - mul = 0x3345; - ps = 0x0c; - p->uartclk = 56000000; - break; - default: - mul = 0x2400; - p->uartclk = 29491200; + unsigned short ps = 16; + unsigned long fuart = baud * ps; + unsigned long w = BIT(24) - 1; + unsigned long mul, div; + + if (fref < fuart) { + /* Find prescaler value that satisfies Fuart < Fref */ + if (fref > baud) + ps = fref / baud; /* baud rate too high */ + else + ps = 1; /* PLL case */ + fuart = baud * ps; + } else { + /* Get Fuart closer to Fref */ + fuart *= rounddown_pow_of_two(fref / fuart); } + rational_best_approximation(fuart, fref, w, w, &mul, &div); + p->uartclk = fuart * 16 / ps; /* core uses ps = 16 always */ + writel(ps, p->membase + INTEL_MID_UART_PS); /* set PS */ writel(mul, p->membase + INTEL_MID_UART_MUL); /* set MUL */ + writel(div, p->membase + INTEL_MID_UART_DIV); serial8250_do_set_termios(p, termios, old); } +static void intel_mid_set_termios_50M(struct uart_port *p, + struct ktermios *termios, + struct ktermios *old) +{ + /* + * The uart clk is 50Mhz, and the baud rate come from: + * baud = 50M * MUL / (DIV * PS * DLAB) + */ + intel_mid_set_termios(p, termios, old, 50000000); +} static bool intel_mid_dma_filter(struct dma_chan *chan, void *param) { -- cgit From 594eb4a4be013b27a4ed28ccf5a3431432723719 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 13 Mar 2015 17:44:25 +0200 Subject: dmaengine: hsu: add Intel Tangier PCI ID Intel Tangier is known to have the HSU DMA IP as PCI device 00:05.0. The patch adds the ID as found on Intel Edison board to the PCI device table. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/dma/hsu/pci.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/dma/hsu/pci.c b/drivers/dma/hsu/pci.c index 563b4685d766..77879e6ddc4c 100644 --- a/drivers/dma/hsu/pci.c +++ b/drivers/dma/hsu/pci.c @@ -105,6 +105,7 @@ static void hsu_pci_remove(struct pci_dev *pdev) static const struct pci_device_id hsu_pci_id_table[] = { { PCI_VDEVICE(INTEL, 0x081e), 0 }, + { PCI_VDEVICE(INTEL, 0x1192), 0 }, { } }; MODULE_DEVICE_TABLE(pci, hsu_pci_id_table); -- cgit From 90b9aacf912af38a177114ca232051c61be8b93e Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 13 Mar 2015 17:44:26 +0200 Subject: serial: 8250_pci: add Intel Tangier support Intel Tangier contains 4 HSUART ports as found on Intel Edison board which are 8250 compatible. The patch adds necessary bits to the driver. Note that the HSU port0 is currently unavailable and thus not supported. Signed-off-by: Andy Shevchenko Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 49 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 0be8dd84f9dc..98e5a6d9cfef 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1540,6 +1540,14 @@ static void intel_mid_set_termios(struct uart_port *p, serial8250_do_set_termios(p, termios, old); } + +static void intel_mid_set_termios_38_4M(struct uart_port *p, + struct ktermios *termios, + struct ktermios *old) +{ + intel_mid_set_termios(p, termios, old, 38400000); +} + static void intel_mid_set_termios_50M(struct uart_port *p, struct ktermios *termios, struct ktermios *old) @@ -1636,6 +1644,27 @@ static int pnw_serial_setup(struct serial_private *priv, return intel_mid_serial_setup(priv, board, port, idx, index, dma_dev); } +#define PCI_DEVICE_ID_INTEL_TNG_UART 0x1191 + +static int tng_serial_setup(struct serial_private *priv, + const struct pciserial_board *board, + struct uart_8250_port *port, int idx) +{ + struct pci_dev *pdev = priv->dev; + struct pci_dev *dma_dev; + int index = PCI_FUNC(pdev->devfn); + + /* Currently no support for HSU port0 */ + if (index-- == 0) + return -ENODEV; + + dma_dev = pci_get_slot(pdev->bus, PCI_DEVFN(5, 0)); + + port->port.set_termios = intel_mid_set_termios_38_4M; + + return intel_mid_serial_setup(priv, board, port, idx, index, dma_dev); +} + static int pci_omegapci_setup(struct serial_private *priv, const struct pciserial_board *board, @@ -2112,6 +2141,13 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { .subdevice = PCI_ANY_ID, .setup = pnw_serial_setup, }, + { + .vendor = PCI_VENDOR_ID_INTEL, + .device = PCI_DEVICE_ID_INTEL_TNG_UART, + .subvendor = PCI_ANY_ID, + .subdevice = PCI_ANY_ID, + .setup = tng_serial_setup, + }, { .vendor = PCI_VENDOR_ID_INTEL, .device = PCI_DEVICE_ID_INTEL_BSW_UART1, @@ -2990,6 +3026,7 @@ enum pci_board_num_t { pbn_ce4100_1_115200, pbn_byt, pbn_pnw, + pbn_tng, pbn_qrk, pbn_omegapci, pbn_NETMOS9900_2s_115200, @@ -3761,6 +3798,11 @@ static struct pciserial_board pci_boards[] = { .num_ports = 1, .base_baud = 115200, }, + [pbn_tng] = { + .flags = FL_BASE0, + .num_ports = 1, + .base_baud = 1843200, + }, [pbn_qrk] = { .flags = FL_BASE0, .num_ports = 1, @@ -5506,6 +5548,13 @@ static struct pci_device_id serial_pci_tbl[] = { PCI_ANY_ID, PCI_ANY_ID, 0, 0, pbn_pnw}, + /* + * Intel Tangier + */ + { PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TNG_UART, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, + pbn_tng}, + /* * Intel Quark x1000 */ -- cgit From 4bb82458ec76edc6d2a91fd3b2d2daae44561443 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 16 Mar 2015 10:53:57 +0200 Subject: dmaengine: hsu: remove redundant pieces of code There are few places where the implemented pieces of code are not needed, i.e.: - direction can't be wrong in hsu_dma_chan_start() - desc->active set to 0 by kzalloc - DMAEngine is NULL-aware when call ->device_alloc_chan_resources() Signed-off-by: Andy Shevchenko Acked-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/hsu/hsu.c | 13 ++----------- 1 file changed, 2 insertions(+), 11 deletions(-) diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c index 683ba9b62795..e649b62431e2 100644 --- a/drivers/dma/hsu/hsu.c +++ b/drivers/dma/hsu/hsu.c @@ -58,7 +58,7 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc) { struct dma_slave_config *config = &hsuc->config; struct hsu_dma_desc *desc = hsuc->desc; - u32 bsr, mtsr; + u32 bsr = 0, mtsr = 0; /* to shut the compiler up */ u32 dcr = HSU_CH_DCR_CHSOE | HSU_CH_DCR_CHEI; unsigned int i, count; @@ -68,9 +68,6 @@ static void hsu_dma_chan_start(struct hsu_dma_chan *hsuc) } else if (hsuc->direction == DMA_DEV_TO_MEM) { bsr = config->src_maxburst; mtsr = config->src_addr_width; - } else { - /* Not supported direction */ - return; } hsu_chan_disable(hsuc); @@ -243,7 +240,7 @@ static struct dma_async_tx_descriptor *hsu_dma_prep_slave_sg( desc->nents = sg_len; desc->direction = direction; - desc->active = 0; + /* desc->active = 0 by kzalloc */ desc->status = DMA_IN_PROGRESS; return vchan_tx_prep(&hsuc->vchan, &desc->vdesc, flags); @@ -396,11 +393,6 @@ static int hsu_dma_terminate_all(struct dma_chan *chan) return 0; } -static int hsu_dma_alloc_chan_resources(struct dma_chan *chan) -{ - return 0; -} - static void hsu_dma_free_chan_resources(struct dma_chan *chan) { vchan_free_chan_resources(to_virt_chan(chan)); @@ -453,7 +445,6 @@ int hsu_dma_probe(struct hsu_dma_chip *chip) dma_cap_set(DMA_SLAVE, hsu->dma.cap_mask); dma_cap_set(DMA_PRIVATE, hsu->dma.cap_mask); - hsu->dma.device_alloc_chan_resources = hsu_dma_alloc_chan_resources; hsu->dma.device_free_chan_resources = hsu_dma_free_chan_resources; hsu->dma.device_prep_slave_sg = hsu_dma_prep_slave_sg; -- cgit From ad53b26cd140fbea92d79a449c8ddb8d1a6f5f26 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Mon, 16 Mar 2015 10:53:58 +0200 Subject: dmaengine: hsu: move memory allocation to GFP_NOWAIT The GFP_ATOMIC is too strict, and DMAEngine documentation make an advice to use GFP_NOWAIT. This patch does the conversion. Signed-off-by: Andy Shevchenko Acked-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/dma/hsu/hsu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c index e649b62431e2..9b84def7a353 100644 --- a/drivers/dma/hsu/hsu.c +++ b/drivers/dma/hsu/hsu.c @@ -198,11 +198,11 @@ static struct hsu_dma_desc *hsu_dma_alloc_desc(unsigned int nents) { struct hsu_dma_desc *desc; - desc = kzalloc(sizeof(*desc), GFP_ATOMIC); + desc = kzalloc(sizeof(*desc), GFP_NOWAIT); if (!desc) return NULL; - desc->sg = kcalloc(nents, sizeof(*desc->sg), GFP_ATOMIC); + desc->sg = kcalloc(nents, sizeof(*desc->sg), GFP_NOWAIT); if (!desc->sg) { kfree(desc); return NULL; -- cgit From 9001c07995fdd1f3657408c71bca7d6c5fb87fd3 Mon Sep 17 00:00:00 2001 From: Heikki Krogerus Date: Wed, 18 Mar 2015 12:55:12 +0200 Subject: serial: 8250_dw: remove useless ACPI ID check Having ACPI handle does not mean the same as having ACPI identifier. The check is in any case useless, but having it prevents this driver from being used for example with multifunctional PCI devices, such as the newer Intel LPSS devices. Signed-off-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index d641886b254a..cc943fe3fd68 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -391,15 +391,10 @@ static int dw8250_probe_of(struct uart_port *p, static int dw8250_probe_acpi(struct uart_8250_port *up, struct dw8250_data *data) { - const struct acpi_device_id *id; struct uart_port *p = &up->port; dw8250_setup_port(up); - id = acpi_match_device(p->dev->driver->acpi_match_table, p->dev); - if (!id) - return -ENODEV; - if (!p->uartclk) if (device_property_read_u32(p->dev, "clock-frequency", &p->uartclk)) -- cgit From 23f5b3fdd04e89b4c67fd9ffa60a193d239acf0f Mon Sep 17 00:00:00 2001 From: Heikki Krogerus Date: Wed, 18 Mar 2015 12:55:13 +0200 Subject: serial: 8250_dw: only get the clock rate in one place The clock rate is requested from a property called "clock-frequency" in both dw8250_probe_of and dw8250_probe_acpi. Moving the requests to dw8250_probe. Signed-off-by: Heikki Krogerus Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_dw.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index cc943fe3fd68..176f18f2e3ab 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -374,17 +374,6 @@ static int dw8250_probe_of(struct uart_port *p, data->msr_mask_off |= UART_MSR_TERI; } - /* clock got configured through clk api, all done */ - if (p->uartclk) - return 0; - - /* try to find out clock frequency from DT as fallback */ - if (of_property_read_u32(np, "clock-frequency", &val)) { - dev_err(p->dev, "clk or clock-frequency not defined\n"); - return -EINVAL; - } - p->uartclk = val; - return 0; } @@ -395,11 +384,6 @@ static int dw8250_probe_acpi(struct uart_8250_port *up, dw8250_setup_port(up); - if (!p->uartclk) - if (device_property_read_u32(p->dev, "clock-frequency", - &p->uartclk)) - return -EINVAL; - p->iotype = UPIO_MEM32; p->serial_in = dw8250_serial_in32; p->serial_out = dw8250_serial_out32; @@ -453,12 +437,18 @@ static int dw8250_probe(struct platform_device *pdev) return -ENOMEM; data->usr_reg = DW_UART_USR; + + /* Always ask for fixed clock rate from a property. */ + device_property_read_u32(&pdev->dev, "clock-frequency", + &uart.port.uartclk); + + /* If there is separate baudclk, get the rate from it. */ data->clk = devm_clk_get(&pdev->dev, "baudclk"); if (IS_ERR(data->clk) && PTR_ERR(data->clk) != -EPROBE_DEFER) data->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) return -EPROBE_DEFER; - if (!IS_ERR(data->clk)) { + if (!IS_ERR_OR_NULL(data->clk)) { err = clk_prepare_enable(data->clk); if (err) dev_warn(&pdev->dev, "could not enable optional baudclk: %d\n", @@ -467,6 +457,12 @@ static int dw8250_probe(struct platform_device *pdev) uart.port.uartclk = clk_get_rate(data->clk); } + /* If no clock rate is defined, fail. */ + if (!uart.port.uartclk) { + dev_err(&pdev->dev, "clock rate not defined\n"); + return -EINVAL; + } + data->pclk = devm_clk_get(&pdev->dev, "apb_pclk"); if (IS_ERR(data->clk) && PTR_ERR(data->clk) == -EPROBE_DEFER) { err = -EPROBE_DEFER; -- cgit From fbf47635315ab308c9b58a1ea0906e711a9228de Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 26 Mar 2015 23:10:27 +0100 Subject: tty: clean up the tty time logic a bit We only care if anything other than the lower 3 bits of the tty has changed, so just check that way, which makes it a bit faster, and more obvious what is going on. Also, document this for future developers to understand why we did this. Reported-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/tty_io.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index 3949d9527e6d..e5695467598f 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -1025,11 +1025,17 @@ void start_tty(struct tty_struct *tty) } EXPORT_SYMBOL(start_tty); -/* We limit tty time update visibility to every 8 seconds or so. */ static void tty_update_time(struct timespec *time) { unsigned long sec = get_seconds(); - if (abs(sec - time->tv_sec) & ~7) + + /* + * We only care if the two values differ in anything other than the + * lower three bits (i.e every 8 seconds). If so, then we can update + * the time of the tty device, otherwise it could be construded as a + * security leak to let userspace know the exact timing of the tty. + */ + if ((sec ^ time->tv_sec) & ~7) time->tv_sec = sec; } -- cgit From 99492c39f39fc2d8c4ae36ecfb88d7de5d8106b5 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Fri, 3 Apr 2015 08:57:51 -0400 Subject: earlycon: Fix __earlycon_table stride The compiler and the linker must agree on the alignment of struct earlycon_id; empirical testing and commit 07fca0e57fca92 ("tracing: Properly align linker defined symbols") suggests 32-byte alignment is the LCD. Reported-by: Yinghai Lu Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- include/asm-generic/vmlinux.lds.h | 2 +- include/linux/serial_core.h | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 87e5b6f8f4fc..561daf49e52f 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -151,7 +151,7 @@ #endif #ifdef CONFIG_SERIAL_EARLYCON -#define EARLYCON_TABLE() . = ALIGN(8); \ +#define EARLYCON_TABLE() STRUCT_ALIGN(); \ VMLINUX_SYMBOL(__earlycon_table) = .; \ *(__earlycon_table) \ *(__earlycon_table_end) diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index 34de16840152..025dad9dcde4 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -342,7 +342,7 @@ struct earlycon_device { struct earlycon_id { char name[16]; int (*setup)(struct earlycon_device *, const char *options); -}; +} __aligned(32); extern int setup_earlycon(char *buf); extern int of_setup_earlycon(unsigned long addr, -- cgit From 87515772c33ee8a0cc08d984a7d2401eeff074cd Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 6 Apr 2015 10:48:49 -0400 Subject: earlycon: 8250: Fix command line regression Restore undocumented behavior of kernel command line parameters of the forms: console=uart[8250],io|mmio|mmio32,[,options] console=uart[8250],[,options] where 'options' have not been specified; in this case, the hardware is assumed to be initialized. Fixes: c7cef0a84912cab3c9df8 ("console: Add extensible console matching") Reported-by: Yinghai Lu Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_core.c | 31 ++++++++++++++++++++++++------- drivers/tty/serial/8250/8250_early.c | 19 ------------------- 2 files changed, 24 insertions(+), 26 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e0fb5f053d09..18142ee3c013 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3412,9 +3412,23 @@ static void univ8250_console_write(struct console *co, const char *s, serial8250_console_write(up, s, count); } -static int serial8250_console_setup(struct uart_8250_port *up, char *options) +static unsigned int probe_baud(struct uart_port *port) +{ + unsigned char lcr, dll, dlm; + unsigned int quot; + + lcr = serial_port_in(port, UART_LCR); + serial_port_out(port, UART_LCR, lcr | UART_LCR_DLAB); + dll = serial_port_in(port, UART_DLL); + dlm = serial_port_in(port, UART_DLM); + serial_port_out(port, UART_LCR, lcr); + + quot = (dlm << 8) | dll; + return (port->uartclk / 16) / quot; +} + +static int serial8250_console_setup(struct uart_port *port, char *options, bool probe) { - struct uart_port *port = &up->port; int baud = 9600; int bits = 8; int parity = 'n'; @@ -3425,13 +3439,15 @@ static int serial8250_console_setup(struct uart_8250_port *up, char *options) if (options) uart_parse_options(options, &baud, &parity, &bits, &flow); + else if (probe) + baud = probe_baud(port); return uart_set_options(port, port->cons, baud, parity, bits, flow); } static int univ8250_console_setup(struct console *co, char *options) { - struct uart_8250_port *up; + struct uart_port *port; /* * Check whether an invalid uart number has been specified, and @@ -3440,11 +3456,11 @@ static int univ8250_console_setup(struct console *co, char *options) */ if (co->index >= nr_uarts) co->index = 0; - up = &serial8250_ports[co->index]; + port = &serial8250_ports[co->index].port; /* link port to console */ - up->port.cons = co; + port->cons = co; - return serial8250_console_setup(up, options); + return serial8250_console_setup(port, options, false); } /** @@ -3491,7 +3507,8 @@ static int univ8250_console_match(struct console *co, char *name, int idx, continue; co->index = i; - return univ8250_console_setup(co, options); + port->cons = co; + return serial8250_console_setup(port, options, true); } return -ENODEV; diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c index e95ebfe8427f..8e119682266a 100644 --- a/drivers/tty/serial/8250/8250_early.c +++ b/drivers/tty/serial/8250/8250_early.c @@ -105,21 +105,6 @@ static void __init early_serial8250_write(struct console *console, serial8250_early_out(port, UART_IER, ier); } -static unsigned int __init probe_baud(struct uart_port *port) -{ - unsigned char lcr, dll, dlm; - unsigned int quot; - - lcr = serial8250_early_in(port, UART_LCR); - serial8250_early_out(port, UART_LCR, lcr | UART_LCR_DLAB); - dll = serial8250_early_in(port, UART_DLL); - dlm = serial8250_early_in(port, UART_DLM); - serial8250_early_out(port, UART_LCR, lcr); - - quot = (dlm << 8) | dll; - return (port->uartclk / 16) / quot; -} - static void __init init_port(struct earlycon_device *device) { struct uart_port *port = &device->port; @@ -151,10 +136,6 @@ static int __init early_serial8250_setup(struct earlycon_device *device, struct uart_port *port = &device->port; unsigned int ier; - device->baud = probe_baud(&device->port); - snprintf(device->options, sizeof(device->options), "%u", - device->baud); - /* assume the device was initialized, only mask interrupts */ ier = serial8250_early_in(port, UART_IER); serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); -- cgit From ca782f16ce02e3f4fa2ae28a5ff256ac69f731e2 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Mon, 6 Apr 2015 10:52:39 -0400 Subject: earlycon: 8250: Document kernel command line options Document the expected behavior of kernel command lines of the forms: console=uart[8250],io|mmio|mmio32,[,options] console=uart[8250],[,options] and earlycon=uart[8250],io|mmio|mmio32,[,options] earlycon=uart[8250],[,options] Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- Documentation/kernel-parameters.txt | 18 +++++++++++++++--- drivers/tty/serial/8250/8250_core.c | 5 +++-- 2 files changed, 18 insertions(+), 5 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index bfcb1a62a7b4..1facf0bebb31 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -713,10 +713,18 @@ bytes respectively. Such letter suffixes can also be entirely omitted. uart[8250],io,[,options] uart[8250],mmio,[,options] + uart[8250],mmio32,[,options] + uart[8250],0x[,options] Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address, - switching to the matching ttyS device later. The - options are the same as for ttyS, above. + switching to the matching ttyS device later. + MMIO inter-register address stride is either 8-bit + (mmio) or 32-bit (mmio32). + If none of [io|mmio|mmio32], is assumed to be + equivalent to 'mmio'. 'options' are specified in the + same format described for ttyS above; if unspecified, + the h/w is not re-initialized. + hvc Use the hypervisor console device . This is for both Xen and PowerPC hypervisors. @@ -944,11 +952,15 @@ bytes respectively. Such letter suffixes can also be entirely omitted. uart[8250],io,[,options] uart[8250],mmio,[,options] uart[8250],mmio32,[,options] + uart[8250],0x[,options] Start an early, polled-mode console on the 8250/16550 UART at the specified I/O port or MMIO address. MMIO inter-register address stride is either 8-bit (mmio) or 32-bit (mmio32). - The options are the same as for ttyS, above. + If none of [io|mmio|mmio32], is assumed to be + equivalent to 'mmio'. 'options' are specified in the + same format described for "console=ttyS"; if + unspecified, the h/w is not initialized. pl011, Start an early, polled-mode console on a pl011 serial diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 18142ee3c013..422ebea96a64 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -3471,12 +3471,13 @@ static int univ8250_console_setup(struct console *co, char *options) * @options: ptr to option string from console command line * * Only attempts to match console command lines of the form: - * console=uart<>,io|mmio|mmio32,, - * console=uart<>,,options + * console=uart[8250],io|mmio|mmio32,[,] + * console=uart[8250],0x[,] * This form is used to register an initial earlycon boot console and * replace it with the serial8250_console at 8250 driver init. * * Performs console setup for a match (as required by interface) + * If no are specified, then assume the h/w is already setup. * * Returns 0 if console matches; otherwise non-zero to use default matching */ -- cgit From 6a8bc239a8c3e6ad34fceabb61ff8ec6222dad4e Mon Sep 17 00:00:00 2001 From: Peter Hung Date: Wed, 1 Apr 2015 14:00:21 +0800 Subject: serial: 8250_pci: port failed after wakeup from S3 Serial ports of F81504/F81508/F81512 will failed when wakeup from S3(STR). It's due to when the system wakeup from S3(STR), this PCI device's configuration space from 0x40 to 0x40 + max_port * 0x08 should be re-configured. We move all initialization from pci_fintek_setup() to pci_fintek_init() and set it to pci_serial_quirks .init section. It's will re-init this device when system wakeup from pciserial_resume_ports(). Signed-off-by: Peter Hung Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/8250/8250_pci.c | 114 ++++++++++++++++--------------------- 1 file changed, 50 insertions(+), 64 deletions(-) diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c index 98e5a6d9cfef..08da4d3e2162 100644 --- a/drivers/tty/serial/8250/8250_pci.c +++ b/drivers/tty/serial/8250/8250_pci.c @@ -1690,88 +1690,71 @@ static int pci_fintek_setup(struct serial_private *priv, struct uart_8250_port *port, int idx) { struct pci_dev *pdev = priv->dev; - unsigned long iobase; u8 config_base; + u16 iobase; + + config_base = 0x40 + 0x08 * idx; + + /* Get the io address from configuration space */ + pci_read_config_word(pdev, config_base + 4, &iobase); + + dev_dbg(&pdev->dev, "%s: idx=%d iobase=0x%x", __func__, idx, iobase); + + port->port.iotype = UPIO_PORT; + port->port.iobase = iobase; + + return 0; +} + +static int pci_fintek_init(struct pci_dev *dev) +{ + unsigned long iobase; + u32 max_port, i; u32 bar_data[3]; + u8 config_base; - /* - * Find each UARTs offset in PCI configuraion space - */ - switch (idx) { - case 0: - config_base = 0x40; + switch (dev->device) { + case 0x1104: /* 4 ports */ + case 0x1108: /* 8 ports */ + max_port = dev->device & 0xff; break; - case 1: - config_base = 0x48; - break; - case 2: - config_base = 0x50; - break; - case 3: - config_base = 0x58; - break; - case 4: - config_base = 0x60; - break; - case 5: - config_base = 0x68; - break; - case 6: - config_base = 0x70; - break; - case 7: - config_base = 0x78; - break; - case 8: - config_base = 0x80; - break; - case 9: - config_base = 0x88; - break; - case 10: - config_base = 0x90; - break; - case 11: - config_base = 0x98; + case 0x1112: /* 12 ports */ + max_port = 12; break; default: - /* Unknown number of ports, get out of here */ return -EINVAL; } /* Get the io address dispatch from the BIOS */ - pci_read_config_dword(pdev, 0x24, &bar_data[0]); - pci_read_config_dword(pdev, 0x20, &bar_data[1]); - pci_read_config_dword(pdev, 0x1c, &bar_data[2]); - - /* Calculate Real IO Port */ - iobase = (bar_data[idx/4] & 0xffffffe0) + (idx % 4) * 8; + pci_read_config_dword(dev, 0x24, &bar_data[0]); + pci_read_config_dword(dev, 0x20, &bar_data[1]); + pci_read_config_dword(dev, 0x1c, &bar_data[2]); - dev_dbg(&pdev->dev, "%s: idx=%d iobase=0x%lx config_base=0x%2x\n", - __func__, idx, iobase, config_base); + for (i = 0; i < max_port; ++i) { + /* UART0 configuration offset start from 0x40 */ + config_base = 0x40 + 0x08 * i; - /* Enable UART I/O port */ - pci_write_config_byte(pdev, config_base + 0x00, 0x01); + /* Calculate Real IO Port */ + iobase = (bar_data[i / 4] & 0xffffffe0) + (i % 4) * 8; - /* Select 128-byte FIFO and 8x FIFO threshold */ - pci_write_config_byte(pdev, config_base + 0x01, 0x33); + /* Enable UART I/O port */ + pci_write_config_byte(dev, config_base + 0x00, 0x01); - /* LSB UART */ - pci_write_config_byte(pdev, config_base + 0x04, (u8)(iobase & 0xff)); + /* Select 128-byte FIFO and 8x FIFO threshold */ + pci_write_config_byte(dev, config_base + 0x01, 0x33); - /* MSB UART */ - pci_write_config_byte(pdev, config_base + 0x05, (u8)((iobase & 0xff00) >> 8)); + /* LSB UART */ + pci_write_config_byte(dev, config_base + 0x04, + (u8)(iobase & 0xff)); - /* irq number, this usually fails, but the spec says to do it anyway. */ - pci_write_config_byte(pdev, config_base + 0x06, pdev->irq); + /* MSB UART */ + pci_write_config_byte(dev, config_base + 0x05, + (u8)((iobase & 0xff00) >> 8)); - port->port.iotype = UPIO_PORT; - port->port.iobase = iobase; - port->port.mapbase = 0; - port->port.membase = NULL; - port->port.regshift = 0; + pci_write_config_byte(dev, config_base + 0x06, dev->irq); + } - return 0; + return max_port; } static int skip_tx_en_setup(struct serial_private *priv, @@ -2814,6 +2797,7 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, .setup = pci_fintek_setup, + .init = pci_fintek_init, }, { .vendor = 0x1c29, @@ -2821,6 +2805,7 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, .setup = pci_fintek_setup, + .init = pci_fintek_init, }, { .vendor = 0x1c29, @@ -2828,6 +2813,7 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { .subvendor = PCI_ANY_ID, .subdevice = PCI_ANY_ID, .setup = pci_fintek_setup, + .init = pci_fintek_init, }, /* -- cgit From f0e381158a95a63a283be4cde64795d37e32134b Mon Sep 17 00:00:00 2001 From: Jakub Kicinski Date: Tue, 31 Mar 2015 21:11:40 +0200 Subject: sc16is7xx: expose RTS inversion in RS-485 mode Hardware is capable of inverting RTS signal when working in RS-485 mode. Expose this functionality to user space. Relay on a matching combination of standard flags (SER_RS485_RTS_ON_SEND and SER_RS485_RTS_AFTER_SEND) to detect when user space is requesting inverted RTS mode. Signed-off-by: Jakub Kicinski Signed-off-by: Jon Ringle Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sc16is7xx.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c index 36b3c266925d..468354ef7baa 100644 --- a/drivers/tty/serial/sc16is7xx.c +++ b/drivers/tty/serial/sc16is7xx.c @@ -829,16 +829,32 @@ static void sc16is7xx_set_termios(struct uart_port *port, } static int sc16is7xx_config_rs485(struct uart_port *port, - struct serial_rs485 *rs485) + struct serial_rs485 *rs485) { - if (port->rs485.flags & SER_RS485_ENABLED) - sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, - SC16IS7XX_EFCR_AUTO_RS485_BIT, - SC16IS7XX_EFCR_AUTO_RS485_BIT); - else - sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, - SC16IS7XX_EFCR_AUTO_RS485_BIT, - 0); + const u32 mask = SC16IS7XX_EFCR_AUTO_RS485_BIT | + SC16IS7XX_EFCR_RTS_INVERT_BIT; + u32 efcr = 0; + + if (rs485->flags & SER_RS485_ENABLED) { + bool rts_during_rx, rts_during_tx; + + rts_during_rx = rs485->flags & SER_RS485_RTS_AFTER_SEND; + rts_during_tx = rs485->flags & SER_RS485_RTS_ON_SEND; + + efcr |= SC16IS7XX_EFCR_AUTO_RS485_BIT; + + if (!rts_during_rx && rts_during_tx) + /* default */; + else if (rts_during_rx && !rts_during_tx) + efcr |= SC16IS7XX_EFCR_RTS_INVERT_BIT; + else + dev_err(port->dev, + "unsupported RTS signalling on_send:%d after_send:%d - exactly one of RS485 RTS flags should be set\n", + rts_during_tx, rts_during_rx); + } + + sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG, mask, efcr); + port->rs485 = *rs485; return 0; -- cgit From 5dbc32a88f1e73f244e6134fc119dd4d60a398c0 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Sun, 29 Mar 2015 14:54:13 +0200 Subject: n_gsm: Drop unneeded cast on netdev_priv The result of netdev_priv is already implicitly cast to the type of the left side of the assignment. The semantic patch that fixes this problem is as follows: (http://coccinelle.lip6.fr/) // @@ type T; T *x; @@ x = - (T *) netdev_priv(...) // Signed-off-by: Julia Lawall Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_gsm.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c index 9546b64a7b90..91abc00aa833 100644 --- a/drivers/tty/n_gsm.c +++ b/drivers/tty/n_gsm.c @@ -2669,7 +2669,7 @@ static inline void muxnet_put(struct gsm_mux_net *mux_net) static int gsm_mux_net_start_xmit(struct sk_buff *skb, struct net_device *net) { - struct gsm_mux_net *mux_net = (struct gsm_mux_net *)netdev_priv(net); + struct gsm_mux_net *mux_net = netdev_priv(net); struct gsm_dlci *dlci = mux_net->dlci; muxnet_get(mux_net); @@ -2698,7 +2698,7 @@ static void gsm_mux_rx_netchar(struct gsm_dlci *dlci, { struct net_device *net = dlci->net; struct sk_buff *skb; - struct gsm_mux_net *mux_net = (struct gsm_mux_net *)netdev_priv(net); + struct gsm_mux_net *mux_net = netdev_priv(net); muxnet_get(mux_net); /* Allocate an sk_buff */ @@ -2727,7 +2727,7 @@ static void gsm_mux_rx_netchar(struct gsm_dlci *dlci, static int gsm_change_mtu(struct net_device *net, int new_mtu) { - struct gsm_mux_net *mux_net = (struct gsm_mux_net *)netdev_priv(net); + struct gsm_mux_net *mux_net = netdev_priv(net); if ((new_mtu < 8) || (new_mtu > mux_net->dlci->gsm->mtu)) return -EINVAL; net->mtu = new_mtu; @@ -2763,7 +2763,7 @@ static void gsm_destroy_network(struct gsm_dlci *dlci) pr_debug("destroy network interface"); if (!dlci->net) return; - mux_net = (struct gsm_mux_net *)netdev_priv(dlci->net); + mux_net = netdev_priv(dlci->net); muxnet_put(mux_net); } @@ -2801,7 +2801,7 @@ static int gsm_create_network(struct gsm_dlci *dlci, struct gsm_netconfig *nc) return -ENOMEM; } net->mtu = dlci->gsm->mtu; - mux_net = (struct gsm_mux_net *)netdev_priv(net); + mux_net = netdev_priv(net); mux_net->dlci = dlci; kref_init(&mux_net->ref); strncpy(nc->if_name, net->name, IFNAMSIZ); /* return net name */ -- cgit