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path: root/drivers/tty/serial/samsung_tty.c
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2022-08-30serial: Make ->set_termios() old ktermios constIlpo Järvinen
There should be no reason to adjust old ktermios which is going to get discarded anyway. Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220816115739.10928-7-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-08-08Merge tag 'tty-6.0-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty Pull tty / serial driver updates from Greg KH: "Here is the big set of tty and serial driver changes for 6.0-rc1. It was delayed from last week as I wanted to make sure the last commit here got some good testing in linux-next and elsewhere as it seemed to show up only late in testing for some reason. Nothing major here, just lots of cleanups from Jiri and Ilpo to make the tty core cleaner (Jiri) and the rs485 code simpler to use (Ilpo). Also included in here is the obligatory n_gsm updates from Daniel Starke and lots of tiny driver updates and minor fixes and tweaks for other smaller serial drivers. All of these have been in linux-next for a while with no reported problems" * tag 'tty-6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (186 commits) tty: serial: qcom-geni-serial: Fix %lu -> %u in print statements tty: amiserial: Fix comment typo tty: serial: document uart_get_console() tty: serial: serial_core, reformat kernel-doc for functions Documentation: serial: link uart_ops properly Documentation: serial: move GPIO kernel-doc to the functions Documentation: serial: dedup kernel-doc for uart functions Documentation: serial: move uart_ops documentation to the struct dt-bindings: serial: snps-dw-apb-uart: Document Rockchip RV1126 serial: mvebu-uart: uart2 error bits clearing tty: serial: fsl_lpuart: correct the count of break characters serial: stm32: make info structs static to avoid sparse warnings serial: fsl_lpuart: zero out parity bit in CS7 mode tty: serial: qcom-geni-serial: Fix get_clk_div_rate() which otherwise could return a sub-optimal clock rate. serial: 8250_bcm2835aux: Add missing clk_disable_unprepare() tty: vt: initialize unicode screen buffer serial: remove VR41XX serial driver serial: 8250: lpc18xx: Remove redundant sanity check for RS485 flags serial: 8250_dwlib: remove redundant sanity check for RS485 flags dt_bindings: rs485: Correct delay values ...
2022-07-14tty: serial: samsung_tty: fix s3c24xx_serial_set_mctrl()Marek Szyprowski
S3C2410_UCON is a 32bit register, so it must be read with rd_regl() instead of rd_reg(), otherwise the upper bits will be zeroed. Fix this. Fixes: 72a43046b61a ("tty: serial: samsung_tty: loopback mode support") Tested-by: Chanho Park <chanho61.park@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Chanho Park <chanho61.park@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Link: https://lore.kernel.org/r/20220712140745.30362-1-m.szyprowski@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-30tty: serial: samsung_tty: loopback mode supportChanho Park
Internal loopback mode can be supported by setting UCON register's Loopback Mode bit. The mode & bit can be supported since s3c2410 and later SoCs. The prefix of LOOPBACK / BIT(5) naming should be also changed to S3C2410_ in order to avoid confusion. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Chanho Park <chanho61.park@samsung.com> Link: https://lore.kernel.org/r/20220629004141.51484-1-chanho61.park@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-30tty: serial: samsung_tty: support more than 4 uart portsChanho Park
Regarding Exynos Auto v9 SoC, it supports uarts up to 12. However, the maximum number of the ports has been derived from CONFIG_SERIAL_SAMSUNG_UARTS and tightly coupled with the config for previous Samsung SoCs such as s3c24xx and s3c64xx. To overcome this limitation, this changes the usage of the definition to UART_NR which is widely used from other serial drivers. This also defines the value to 12 only for ARM64 SoCs to not affect the change to previous arm32 SoCs. Instead of enumerating all the ports as predefined arrays, this introduces s3c24xx_serial_init_port_default that is initializing the structure as the default value. Reviewed-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Chanho Park <chanho61.park@samsung.com> Link: https://lore.kernel.org/r/20220629005538.60132-1-chanho61.park@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-27tty: serial: samsung_tty: set dma burst_size to 1Chanho Park
The src_maxburst and dst_maxburst have been changed to 1 but the settings of the UCON register aren't changed yet. They should be changed as well according to the dmaengine slave config. Fixes: aa2f80e752c7 ("serial: samsung: fix maxburst parameter for DMA transactions") Cc: stable <stable@kernel.org> Cc: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Signed-off-by: Chanho Park <chanho61.park@samsung.com> Link: https://lore.kernel.org/r/20220627065113.139520-1-chanho61.park@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-05-19tty: serial: samsung_tty: Fix suspend/resume on S5LHector Martin
We were restoring the IRQ masks then clearing them again, because ucon_mask wasn't set properly. Adding that makes suspend/resume work as intended. Signed-off-by: Hector Martin <marcan@marcan.st> Link: https://lore.kernel.org/r/20220502092505.30934-1-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-15tty: serial: samsung: add spin_lock for interrupt and console_writeJaewon Kim
The console_write and IRQ handler can run concurrently. Problems may occurs console_write is continuously executed while the IRQ handler is running. Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Jaewon Kim <jaewon02.kim@samsung.com> Link: https://lore.kernel.org/r/20220407071619.102249-2-jaewon02.kim@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: Add ARTPEC-8 supportVincent Whitchurch
Add support for the UART block on the ARTPEC-8 SoC. This is closely related to the variants used on the Exynos chips. The register layout is identical to Exynos850 et al but the fifo size is different (64 bytes in each direction for all instances). Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Link: https://lore.kernel.org/r/20220311094515.3223023-3-vincent.whitchurch@axis.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: simplify getting OF match dataKrzysztof Kozlowski
Simplify the code with of_device_get_match_data() and use dev_of_node() to remove ifdef-erry. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-9-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: constify variables and pointersKrzysztof Kozlowski
Constify variables, data pointed by several pointers and "udivslot_table" static array. This makes code a bit safer. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-8-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: constify s3c24xx_serial_drv_data membersKrzysztof Kozlowski
The driver data (struct s3c24xx_serial_drv_data) is never modified, so also its members can be made const. Except code style this has no impact because the structure itself is always a const. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-7-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: constify UART nameKrzysztof Kozlowski
The UART name from driver data holds only string literals. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-6-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: constify s3c24xx_serial_drv_dataKrzysztof Kozlowski
The driver data (struct s3c24xx_serial_drv_data) is only used to initialize the driver properly and is not modified. Make it const. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-5-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: reduce number of castsKrzysztof Kozlowski
The pointers to instances of "struct s3c24xx_serial_drv_data" are first cast to kernel_ulong_t and then either used directly (in "platform_device_id.driver_data") or cast again to void * (in "of_device_id.data"). One cast can be dropped, so at least for "of_device_id.data" case there will be no casts at all. This makes the code a bit simpler. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-4-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: embed s3c2410_uartcfg in parent structureKrzysztof Kozlowski
Embed "struct s3c2410_uartcfg" directly as a member of "struct s3c24xx_serial_drv_data" instead of keeping it as a pointer. This makes the code clearer (obvious ownership of "s3c2410_uartcfg s3c24xx_serial_drv_data") and saves one pointer. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-3-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18tty: serial: samsung: embed s3c24xx_uart_info in parent structureKrzysztof Kozlowski
Embed "struct s3c24xx_uart_info" directly as a member of "struct s3c24xx_serial_drv_data" instead of keeping it as a pointer. This makes the code clearer (obvious ownership of "struct s3c24xx_serial_drv_data") and saves one pointer. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20220308080919.152715-2-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-18serial: samsung_tty: do not unlock port->lock for uart_write_wakeup()Jiri Slaby
The commit c15c3747ee32 (serial: samsung: fix potential soft lockup during uart write) added an unlock of port->lock before uart_write_wakeup() and a lock after it. It was always problematic to write data from tty_ldisc_ops::write_wakeup and it was even documented that way. We fixed the line disciplines to conform to this recently. So if there is still a missed one, we should fix them instead of this workaround. On the top of that, s3c24xx_serial_tx_dma_complete() in this driver still holds the port->lock while calling uart_write_wakeup(). So revert the wrap added by the commit above. Cc: Thomas Abraham <thomas.abraham@linaro.org> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Hyeonkook Kim <hk619.kim@samsung.com> Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20220308115153.4225-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-03serial: samsung: Add samsung_early_read to support early kgdbocWoody Lin
The 'kgdboc_earlycon_init' looks for boot console that has both .read and .write callbacks. Adds 'samsung_early_read' to samsung_tty.c's early console to support kgdboc. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Woody Lin <woodylin@google.com> Link: https://lore.kernel.org/r/20220302114923.144523-1-woodylin@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-03-03serial: make uart_console_write->putchar()'s character an unsigned charJiri Slaby
Currently, uart_console_write->putchar's second parameter (the character) is of type int. It makes little sense, provided uart_console_write() accepts the input string as "const char *s" and passes its content -- the characters -- to putchar(). So switch the character's type to unsigned char. We don't use char as that is signed on some platforms. That would cause troubles for drivers which (implicitly) cast the char to u16 when writing to the device. Sign extension would happen in that case and the value written would be completely different to the provided char. DZ is an example of such a driver -- on MIPS, it uses u16 for dz_out in dz_console_putchar(). Note we do the char -> uchar conversion implicitly in uart_console_write(). Provided we do not change size of the data type, sign extension does not happen there, so the problem is void. This makes the types consistent and unified with the rest of the uart layer, which uses unsigned char in most places already. One exception is xmit_buf, but that is going to be converted later. Cc: Paul Cercueil <paul@crapouillou.net> Cc: Tobias Klauser <tklauser@distanz.ch> Cc: Russell King <linux@armlinux.org.uk> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Nicolas Ferre <nicolas.ferre@microchip.com> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Cc: Ludovic Desroches <ludovic.desroches@microchip.com> Cc: Florian Fainelli <f.fainelli@gmail.com> Cc: bcm-kernel-feedback-list@broadcom.com Cc: Alexander Shiyan <shc_work@mail.ru> Cc: Baruch Siach <baruch@tkos.co.il> Cc: "Maciej W. Rozycki" <macro@orcam.me.uk> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: Fabio Estevam <festevam@gmail.com> Cc: NXP Linux Team <linux-imx@nxp.com> Cc: Karol Gugala <kgugala@antmicro.com> Cc: Mateusz Holenko <mholenko@antmicro.com> Cc: Vladimir Zapolskiy <vz@mleia.com> Cc: Neil Armstrong <narmstrong@baylibre.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Jerome Brunet <jbrunet@baylibre.com> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Cc: Taichi Sugaya <sugaya.taichi@socionext.com> Cc: Takao Orito <orito.takao@socionext.com> Cc: Liviu Dudau <liviu.dudau@arm.com> Cc: Sudeep Holla <sudeep.holla@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: "Andreas Färber" <afaerber@suse.de> Cc: Manivannan Sadhasivam <mani@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Andy Gross <agross@kernel.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Cc: Orson Zhai <orsonzhai@gmail.com> Cc: Baolin Wang <baolin.wang7@gmail.com> Cc: Chunyan Zhang <zhang.lyra@gmail.com> Cc: Patrice Chotard <patrice.chotard@foss.st.com> Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com> Cc: Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Peter Korsgaard <peter@korsgaard.com> Cc: Michal Simek <michal.simek@xilinx.com> Acked-by: Richard Genoud <richard.genoud@gmail.com> [atmel_serial] Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Paul Cercueil <paul@crapouillou.net> Acked-by: Neil Armstrong <narmstrong@baylibre.com> # meson_serial Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20220303080831.21783-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-20tty: serial: samsung: Fix console registration from moduleSam Protsenko
On modern Exynos SoCs (like Exynos850) the UART can be implemented as a part of USI IP-core. In such case, USI driver is used to initialize USI registers, and it also calls of_platform_populate() to instantiate all sub-nodes (e.g. serial node) of USI node. When serial driver is built-in, but USI driver is a module, and CONFIG_SERIAL_SAMSUNG_CONSOLE is enabled, next call chain will happen when loading USI module from user space: usi_init v usi_probe v of_platform_populate v s3c24xx_serial_probe v uart_add_one_port v uart_configure_port v register_console v try_enable_new_console v s3c24xx_serial_console_setup But because the serial driver is built-in, and s3c24xx_serial_console_setup() is marked with __init keyword, that symbol will discarded and long gone by that time already, causing failed paging request. That happens during the next config combination: EXYNOS_USI=m SERIAL_SAMSUNG=y SERIAL_SAMSUNG_CONSOLE=y That config should be completely possible, so rather than limiting SERIAL_SAMSUNG choice to "m" only when USI=m, remove __init keyword for all affected functions. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211204195757.8600-6-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-20tty: serial: samsung: Enable console as moduleSam Protsenko
Enable serial driver to be built as a module. To do so, init the console support on driver/module load instead of using console_initcall(). Inspired by commit 87a0b9f98ac5 ("tty: serial: meson: enable console as module"). Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211204195757.8600-5-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-20tty: serial: samsung: Remove USI initializationSam Protsenko
USI control is now extracted to the dedicated USI driver. Remove USI related code from serial driver to avoid conflicts and code duplication. Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20211204195757.8600-4-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-10-10tty: serial: samsung: Improve naming for common macroSam Protsenko
Having "_USI" suffix in EXYNOS_COMMON_SERIAL_DRV_DATA_USI() macro is confusing. Rename it to just EXYNOS_COMMON_SERIAL_DRV_DATA() and provide USI registers availability for all Exynos variants instead. While at it, also convert .has_usi field type to bool, so its usage is more obvious. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20211005095800.2165-1-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-08-13tty: serial: samsung: Add Exynos850 SoC dataSam Protsenko
Add serial driver data for Exynos850 SoC. This driver data is basically reusing EXYNOS_COMMON_SERIAL_DRV_DATA, which is common for all Exynos chips, but also enables USI init, which was added in previous commit: "tty: serial: samsung: Init USI to keep clocks running". Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20210811114827.27322-7-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-08-13tty: serial: samsung: Fix driver data macros styleSam Protsenko
Make checkpatch happy by fixing this error: ERROR: Macros with complex values should be enclosed in parentheses Although this change is made to keep macros consistent with consequent patches (adding driver data for new SoC), it's intentionally added as a separate patch to ease possible porting efforts in future. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20210811114827.27322-6-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-08-13tty: serial: samsung: Init USI to keep clocks runningSam Protsenko
UART block is a part of USI (Universal Serial Interface) IP-core in Samsung SoCs since Exynos9810 (e.g. in Exynos850). USI allows one to enable one of three types of serial interface: UART, SPI or I2C. That's possible because USI shares almost all internal circuits within each protocol. USI also provides some additional registers so it's possible to configure it. One USI register called USI_OPTION has reset value of 0x0. Because of this the clock gating behavior is controlled by hardware (HWACG = Hardware Auto Clock Gating), which simply means the serial won't work after reset as is. In order to make it work, USI_OPTION[2:1] bits must be set to 0b01, so that HWACG is controlled manually (by software). Bits meaning: - CLKREQ_ON = 1: clock is continuously provided to IP - CLKSTOP_ON = 0: drive IP_CLKREQ to High (needs to be set along with CLKREQ_ON = 1) USI is not present on older chips, like s3c2410, s3c2412, s3c2440, s3c6400, s5pv210, exynos5433, exynos4210. So the new boolean field '.has_usi' was added to struct s3c24xx_uart_info. USI registers will be only actually accessed when '.has_usi' field is set to "1". This feature is needed for further serial enablement on Exynos850, but some other new Exynos chips (like Exynos9810) may benefit from this feature as well. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org> Link: https://lore.kernel.org/r/20210811114827.27322-5-semen.protsenko@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-07-21serial: samsung: use dma_ops of DMA if attachedTamseel Shams
When DMA is used for TX and RX by serial driver, it should pass the DMA device pointer to DMA API instead of UART device pointer. DMA device should be used for DMA API because only the DMA device is aware of how the device connects to the memory. There might be an extra level of address translation due to a SMMU attached to the DMA device. When serial device is used for DMA API, the DMA API will have no clue of the SMMU attached to the DMA device. This patch is necessary to fix the SMMU page faults which is observed when a DMA(with SMMU enabled) is attached to UART for transfer. Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Tamseel Shams <m.shams@samsung.com> Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com> Link: https://lore.kernel.org/r/20210629045902.48912-1-m.shams@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-05-13tty: serial: samsung_tty: remove set but not used variablesTian Tao
The value of 'ret' is not used which reported by svace, so just return instead of break. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Tian Tao <tiantao6@hisilicon.com> Link: https://lore.kernel.org/r/1619484575-26098-1-git-send-email-tiantao6@hisilicon.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-23tty: serial: samsung_tty: remove spinlock flags in interrupt handlersKrzysztof Kozlowski
Since interrupt handler is called with disabled local interrupts, there is no need to use the spinlock primitives disabling interrupts as well. Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Johan Hovold <johan@kernel.org> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210315181212.113217-1-krzysztof.kozlowski@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: Add earlycon support for Apple UARTsHector Martin
Earlycon support is identical to S3C2410, but Apple SoCs also need MMIO mapped as nGnRnE. This is handled generically for normal drivers including the normal UART path here, but earlycon uses fixmap and runs before that scaffolding is ready. Since this is the only case where we need this fix, it makes more sense to do it here in the UART driver instead of introducing a whole fdt nonposted-mmio resolver just for earlycon/fixmap. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-26-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: Add support for Apple UARTsHector Martin
Apple SoCs are a distant descendant of Samsung designs and use yet another variant of their UART style, with different interrupt handling. In particular, this variant has the following differences with existing ones: * It includes a built-in interrupt controller with different registers, using only a single platform IRQ * Internal interrupt sources are treated as edge-triggered, even though the IRQ output is level-triggered. This chiefly affects the TX IRQ path: the driver can no longer rely on the TX buffer empty IRQ immediately firing after TX is enabled, but instead must prime the FIFO with data directly. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-25-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: Use devm_ioremap_resourceHector Martin
This picks up the non-posted I/O mode needed for Apple platforms to work properly. This removes the request/release functions, which are no longer necessary, since devm_ioremap_resource takes care of that already. Most other drivers already do it this way, anyway. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-23-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: IRQ reworkHector Martin
* Split out s3c24xx_serial_tx_chars from s3c24xx_serial_tx_irq, where only the latter acquires the port lock. This will be necessary on platforms which have edge-triggered IRQs, as we need to call s3c24xx_serial_tx_chars to kick off transmission from outside IRQ context, with the port lock held. * Rename s3c24xx_serial_rx_chars to s3c24xx_serial_rx_irq for consistency with the above. All it does now is call two other functions anyway. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-22-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: Add s3c24xx_port_typeHector Martin
This decouples the TTY layer PORT_ types, which are exposed to userspace, from the driver-internal flag of what kind of port this is. This removes s3c24xx_serial_has_interrupt_mask, which was just checking for a specific type anyway. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-21-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: Separate S3C64XX ops structureHector Martin
Instead of patching a single global ops structure depending on the port type, use a separate s3c64xx_serial_ops for the S3C64XX type. This allows us to mark the structures as const. Also split out s3c64xx_serial_shutdown into a separate function now that we have a separate ops structure; this avoids excessive branching control flow and mirrors s3c64xx_serial_startup. tx_claimed and rx_claimed are only used in the S3C24XX functions. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-19-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-10tty: serial: samsung_tty: Add ucon_mask parameterHector Martin
This simplifies the code by removing the only distinction between the S3C2410 and S3C2440 codepaths. Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Link: https://lore.kernel.org/r/20210304213902.83903-20-marcan@marcan.st Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-08-18serial: samsung: Removes the IRQ not found warningTamseel Shams
In few older Samsung SoCs like s3c2410, s3c2412 and s3c2440, UART IP is having 2 interrupt lines. However, in other SoCs like s3c6400, s5pv210, exynos5433, and exynos4210 UART is having only 1 interrupt line. Due to this, "platform_get_irq(platdev, 1)" call in the driver gives the following false-positive error: "IRQ index 1 not found" on newer SoC's. This patch adds the condition to check for Tx interrupt only for the those SoC's which have 2 interrupt lines. Tested-by: Alim Akhtar <alim.akhtar@samsung.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Tamseel Shams <m.shams@samsung.com> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20200810030021.45348-1-m.shams@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-06-27serial: samsung: fix spelling mistakeTamseel Shams
There is a spelling mistake in a comment. Fix it. Signed-off-by: Tamseel Shams <m.shams@samsung.com> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Link: https://lore.kernel.org/r/20200617105907.7143-1-m.shams@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-06-27serial: samsung: Minor whitespace cleanupsKrzysztof Kozlowski
Make the code slightly more readable by removing unneeded line breaks, adding missing line breaks and white spaces. This also fixes few strict checkpatch suggestions: CHECK: spaces preferred around that '-' (ctx:VxV) CHECK: Unbalanced braces around else statement CHECK: Lines should not end with a '(' Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20200617152856.18086-1-krzk@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-15tty: serial: samsung: Correct clock selection logicJonathan Bakker
Some variants of the samsung tty driver can pick which clock to use for their baud rate generation. In the DT conversion, a default clock was selected to be used if a specific one wasn't assigned and then a comparison of which clock rate worked better was done. Unfortunately, the comparison was implemented in such a way that only the default clock was ever actually compared. Fix this by iterating through all possible clocks, except when a specific clock has already been picked via clk_sel (which is only possible via board files). Signed-off-by: Jonathan Bakker <xc-racer2@live.ca> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/BN6PR04MB06604E63833EA41837EBF77BA3A30@BN6PR04MB0660.namprd04.prod.outlook.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-06serial: samsung: 32-bit access for TX/RX hold registersHyunki Koo
Support 32-bit access for the TX/RX hold registers UTXH and URXH. This is required for some newer SoCs. Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Tested on Odroid HC1 (Exynos5422): Tested-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20200506080242.18623-3-hyunki00.koo@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-05-06serial: samsung: Replace rd_regb/wr_regb with rd_reg/wr_regHyunki Koo
This patch change the name of macro for general usage. Signed-off-by: Hyunki Koo <hyunki00.koo@samsung.com> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Tested on Odroid HC1 (Exynos5422): Tested-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20200506080242.18623-1-hyunki00.koo@samsung.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-06serial: samsung: Rename Exynos to lowercaseKrzysztof Kozlowski
Fix up inconsistent usage of upper and lowercase letters in "Exynos" name. "EXYNOS" is not an abbreviation but a regular trademarked name. Therefore it should be written with lowercase letters starting with capital letter. The lowercase "Exynos" name is promoted by its manufacturer Samsung Electronics Co., Ltd., in advertisement materials and on website. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20200104152107.11407-18-krzk@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-18tty/serial: Migrate samsung_tty to use has_sysrqDmitry Safonov
The SUPPORT_SYSRQ ifdeffery is not nice as: - May create misunderstanding about sizeof(struct uart_port) between different objects - Prevents moving functions from serial_core.h - Reduces readability (well, it's ifdeffery - it's hard to follow) In order to remove SUPPORT_SYSRQ, has_sysrq variable has been added. Initialise it in driver's probe and remove ifdeffery. Signed-off-by: Dmitry Safonov <dima@arista.com> Link: https://lore.kernel.org/r/20191213000657.931618-38-dima@arista.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-17tty: serial: samsung_tty: do not abuse the struct uart_port unused fieldsGreg Kroah-Hartman
The samsung_tty driver was trying to abuse the struct uart_port by using two "empty" bytes for its own use. That's not ok, and was found by removing those fields from the structure. Move the variables into the port-specific structure, which is where everything else for this port already is. There is no space wasted here as there was an empty "hole" in the structure already for these bytes. Cc: Kukjin Kim <kgene@kernel.org> Cc: Hyunki Koo <kkoos00@naver.com> Cc: HYUN-KI KOO <hyunki00.koo@samsung.com> Cc: Shinbeom Choi <sbeom.choi@samsung.com> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Dmitry Safonov <dima@arista.com> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Link: https://lore.kernel.org/r/20191217140232.GA3489190@kroah.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-12tty: serial: samsung_tty: fix blank line checkpatch warningGreg Kroah-Hartman
checkpatch is giving a bunch of: WARNING: Missing a blank line after declarations messages on this file, so fix up all instances of that issue. Cc: Kukjin Kim <kgene@kernel.org> Cc: Krzysztof Kozlowski <krzk@kernel.org> Cc: Hyunki Koo <kkoos00@naver.com> Cc: HYUN-KI KOO <hyunki00.koo@samsung.com> Cc: Shinbeom Choi <sbeom.choi@samsung.com> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Link: https://lore.kernel.org/r/20191210143706.3928480-10-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-12tty: serial: samsung_tty: fix up minor comment formattingGreg Kroah-Hartman
Fix up some minor formatting of comment blocks to make checkpatch happier and to make things look more uniform. Cc: Kukjin Kim <kgene@kernel.org> Cc: Hyunki Koo <kkoos00@naver.com> Cc: HYUN-KI KOO <hyunki00.koo@samsung.com> Cc: Shinbeom Choi <sbeom.choi@samsung.com> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20191210143706.3928480-9-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-12tty: serial: samsung_tty: use 'unsigned int' not 'unsigned'Greg Kroah-Hartman
The function uart_console_write() expects an unsigned int, so use that variable type, not 'unsigned', which is generally frowned apon in the kernel now. Cc: Kukjin Kim <kgene@kernel.org> Cc: Hyunki Koo <kkoos00@naver.com> Cc: HYUN-KI KOO <hyunki00.koo@samsung.com> Cc: Shinbeom Choi <sbeom.choi@samsung.com> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20191210143706.3928480-8-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-12-12tty: serial: samsung_tty: use standard debugging macrosGreg Kroah-Hartman
The dbg() macro for the driver is not needed at all, all drivers should use the common dynamic debugging infrastructure, not roll their own. So delete the custom macro and convert the driver to use dev_dbg() instead, providing a lot more information than the previous macro provided. Cc: Kukjin Kim <kgene@kernel.org> Cc: Hyunki Koo <kkoos00@naver.com> Cc: HYUN-KI KOO <hyunki00.koo@samsung.com> Cc: Shinbeom Choi <sbeom.choi@samsung.com> Cc: Jiri Slaby <jslaby@suse.com> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-serial@vger.kernel.org Cc: linux-kernel@vger.kernel.org Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org> Link: https://lore.kernel.org/r/20191210143706.3928480-7-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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