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-rw-r--r--arch/mips/alchemy/common/platform.c10
-rw-r--r--drivers/tty/serial/8250/8250_early.c21
-rw-r--r--drivers/tty/serial/8250/8250_of.c4
-rw-r--r--drivers/tty/serial/8250/8250_port.c78
-rw-r--r--drivers/tty/serial/8250/8250_rt288x.c142
-rw-r--r--drivers/tty/serial/8250/Makefile1
-rw-r--r--drivers/tty/serial/Makefile2
-rw-r--r--include/linux/serial_8250.h8
8 files changed, 161 insertions, 105 deletions
diff --git a/arch/mips/alchemy/common/platform.c b/arch/mips/alchemy/common/platform.c
index b8f3397c59c9..d4ab34b3b404 100644
--- a/arch/mips/alchemy/common/platform.c
+++ b/arch/mips/alchemy/common/platform.c
@@ -51,9 +51,9 @@ static void alchemy_8250_pm(struct uart_port *port, unsigned int state,
#define PORT(_base, _irq) \
{ \
.mapbase = _base, \
+ .mapsize = 0x1000, \
.irq = _irq, \
.regshift = 2, \
- .iotype = UPIO_AU, \
.flags = UPF_SKIP_TEST | UPF_IOREMAP | \
UPF_FIXED_TYPE, \
.type = PORT_16550A, \
@@ -124,8 +124,14 @@ static void __init alchemy_setup_uarts(int ctype)
au1xx0_uart_device.dev.platform_data = ports;
/* Fill up uartclk. */
- for (s = 0; s < c; s++)
+ for (s = 0; s < c; s++) {
ports[s].uartclk = uartclk;
+ if (au_platform_setup(&ports[s]) < 0) {
+ kfree(ports);
+ printk(KERN_INFO "Alchemy: missing support for UARTs\n");
+ return;
+ }
+ }
if (platform_device_register(&au1xx0_uart_device))
printk(KERN_INFO "Alchemy: failed to register UARTs\n");
}
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 0ebde0ab8167..4299a8bd83d9 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -36,7 +36,6 @@
static unsigned int serial8250_early_in(struct uart_port *port, int offset)
{
- int reg_offset = offset;
offset <<= port->regshift;
switch (port->iotype) {
@@ -50,8 +49,6 @@ static unsigned int serial8250_early_in(struct uart_port *port, int offset)
return ioread32be(port->membase + offset);
case UPIO_PORT:
return inb(port->iobase + offset);
- case UPIO_AU:
- return port->serial_in(port, reg_offset);
default:
return 0;
}
@@ -59,7 +56,6 @@ static unsigned int serial8250_early_in(struct uart_port *port, int offset)
static void serial8250_early_out(struct uart_port *port, int offset, int value)
{
- int reg_offset = offset;
offset <<= port->regshift;
switch (port->iotype) {
@@ -78,9 +74,6 @@ static void serial8250_early_out(struct uart_port *port, int offset, int value)
case UPIO_PORT:
outb(value, port->iobase + offset);
break;
- case UPIO_AU:
- port->serial_out(port, reg_offset, value);
- break;
}
}
@@ -199,17 +192,3 @@ OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup);
OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup);
#endif
-
-#ifdef CONFIG_SERIAL_8250_RT288X
-
-static int __init early_au_setup(struct earlycon_device *dev, const char *opt)
-{
- dev->port.serial_in = au_serial_in;
- dev->port.serial_out = au_serial_out;
- dev->port.iotype = UPIO_AU;
- dev->con->write = early_serial8250_write;
- return 0;
-}
-OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup);
-
-#endif
diff --git a/drivers/tty/serial/8250/8250_of.c b/drivers/tty/serial/8250/8250_of.c
index 1b461fba15a3..c9f6bd7a7038 100644
--- a/drivers/tty/serial/8250/8250_of.c
+++ b/drivers/tty/serial/8250/8250_of.c
@@ -171,7 +171,9 @@ static int of_platform_serial_setup(struct platform_device *ofdev,
switch (type) {
case PORT_RT2880:
- port->iotype = UPIO_AU;
+ ret = rt288x_setup(port);
+ if (ret)
+ goto err_unprepare;
break;
}
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 344bd447639b..0cef9bfd0471 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -341,66 +341,6 @@ static void default_serial_dl_write(struct uart_8250_port *up, u32 value)
serial_out(up, UART_DLM, value >> 8 & 0xff);
}
-#ifdef CONFIG_SERIAL_8250_RT288X
-
-#define UART_REG_UNMAPPED -1
-
-/* Au1x00/RT288x UART hardware has a weird register layout */
-static const s8 au_io_in_map[8] = {
- [UART_RX] = 0,
- [UART_IER] = 2,
- [UART_IIR] = 3,
- [UART_LCR] = 5,
- [UART_MCR] = 6,
- [UART_LSR] = 7,
- [UART_MSR] = 8,
- [UART_SCR] = UART_REG_UNMAPPED,
-};
-
-static const s8 au_io_out_map[8] = {
- [UART_TX] = 1,
- [UART_IER] = 2,
- [UART_FCR] = 4,
- [UART_LCR] = 5,
- [UART_MCR] = 6,
- [UART_LSR] = UART_REG_UNMAPPED,
- [UART_MSR] = UART_REG_UNMAPPED,
- [UART_SCR] = UART_REG_UNMAPPED,
-};
-
-unsigned int au_serial_in(struct uart_port *p, int offset)
-{
- if (offset >= ARRAY_SIZE(au_io_in_map))
- return UINT_MAX;
- offset = au_io_in_map[offset];
- if (offset == UART_REG_UNMAPPED)
- return UINT_MAX;
- return __raw_readl(p->membase + (offset << p->regshift));
-}
-
-void au_serial_out(struct uart_port *p, int offset, int value)
-{
- if (offset >= ARRAY_SIZE(au_io_out_map))
- return;
- offset = au_io_out_map[offset];
- if (offset == UART_REG_UNMAPPED)
- return;
- __raw_writel(value, p->membase + (offset << p->regshift));
-}
-
-/* Au1x00 haven't got a standard divisor latch */
-static u32 au_serial_dl_read(struct uart_8250_port *up)
-{
- return __raw_readl(up->port.membase + 0x28);
-}
-
-static void au_serial_dl_write(struct uart_8250_port *up, u32 value)
-{
- __raw_writel(value, up->port.membase + 0x28);
-}
-
-#endif
-
static unsigned int hub6_serial_in(struct uart_port *p, int offset)
{
offset = offset << p->regshift;
@@ -510,15 +450,6 @@ static void set_io_from_upio(struct uart_port *p)
p->serial_out = mem32be_serial_out;
break;
-#ifdef CONFIG_SERIAL_8250_RT288X
- case UPIO_AU:
- p->serial_in = au_serial_in;
- p->serial_out = au_serial_out;
- up->dl_read = au_serial_dl_read;
- up->dl_write = au_serial_dl_write;
- break;
-#endif
-
default:
p->serial_in = io_serial_in;
p->serial_out = io_serial_out;
@@ -2968,11 +2899,6 @@ 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;
- return 0x1000;
- }
if (is_omap1_8250(pt))
return 0x16 << pt->port.regshift;
@@ -3222,10 +3148,6 @@ static void serial8250_config_port(struct uart_port *port, int flags)
if (flags & UART_CONFIG_TYPE)
autoconfig(up);
- /* if access method is AU, it is a 16550 with a quirk */
- if (port->type == PORT_16550A && port->iotype == UPIO_AU)
- up->bugs |= UART_BUG_NOMSR;
-
/* HW bugs may trigger IRQ while IIR == NO_INT */
if (port->type == PORT_TEGRA)
up->bugs |= UART_BUG_NOMSR;
diff --git a/drivers/tty/serial/8250/8250_rt288x.c b/drivers/tty/serial/8250/8250_rt288x.c
new file mode 100644
index 000000000000..51b1cf5476dd
--- /dev/null
+++ b/drivers/tty/serial/8250/8250_rt288x.c
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * RT288x/Au1xxx driver
+ */
+
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/console.h>
+#include <linux/serial.h>
+#include <linux/serial_8250.h>
+
+#include "8250.h"
+
+#define UART_REG_UNMAPPED -1
+
+/* Au1x00/RT288x UART hardware has a weird register layout */
+static const s8 au_io_in_map[8] = {
+ [UART_RX] = 0,
+ [UART_IER] = 2,
+ [UART_IIR] = 3,
+ [UART_LCR] = 5,
+ [UART_MCR] = 6,
+ [UART_LSR] = 7,
+ [UART_MSR] = 8,
+ [UART_SCR] = UART_REG_UNMAPPED,
+};
+
+static const s8 au_io_out_map[8] = {
+ [UART_TX] = 1,
+ [UART_IER] = 2,
+ [UART_FCR] = 4,
+ [UART_LCR] = 5,
+ [UART_MCR] = 6,
+ [UART_LSR] = UART_REG_UNMAPPED,
+ [UART_MSR] = UART_REG_UNMAPPED,
+ [UART_SCR] = UART_REG_UNMAPPED,
+};
+
+static unsigned int au_serial_in(struct uart_port *p, int offset)
+{
+ if (offset >= ARRAY_SIZE(au_io_in_map))
+ return UINT_MAX;
+ offset = au_io_in_map[offset];
+ if (offset == UART_REG_UNMAPPED)
+ return UINT_MAX;
+ return __raw_readl(p->membase + (offset << p->regshift));
+}
+
+static void au_serial_out(struct uart_port *p, int offset, int value)
+{
+ if (offset >= ARRAY_SIZE(au_io_out_map))
+ return;
+ offset = au_io_out_map[offset];
+ if (offset == UART_REG_UNMAPPED)
+ return;
+ __raw_writel(value, p->membase + (offset << p->regshift));
+}
+
+/* Au1x00 haven't got a standard divisor latch */
+static u32 au_serial_dl_read(struct uart_8250_port *up)
+{
+ return __raw_readl(up->port.membase + 0x28);
+}
+
+static void au_serial_dl_write(struct uart_8250_port *up, u32 value)
+{
+ __raw_writel(value, up->port.membase + 0x28);
+}
+
+int au_platform_setup(struct plat_serial8250_port *p)
+{
+ p->iotype = UPIO_AU;
+
+ p->serial_in = au_serial_in;
+ p->serial_out = au_serial_out;
+ p->dl_read = au_serial_dl_read;
+ p->dl_write = au_serial_dl_write;
+
+ p->mapsize = 0x1000;
+
+ p->bugs |= UART_BUG_NOMSR;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(au_platform_setup);
+
+int rt288x_setup(struct uart_port *p)
+{
+ struct uart_8250_port *up = up_to_u8250p(p);
+
+ p->iotype = UPIO_AU;
+
+ p->serial_in = au_serial_in;
+ p->serial_out = au_serial_out;
+ up->dl_read = au_serial_dl_read;
+ up->dl_write = au_serial_dl_write;
+
+ p->mapsize = 0x100;
+
+ up->bugs |= UART_BUG_NOMSR;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rt288x_setup);
+
+#ifdef CONFIG_SERIAL_8250_CONSOLE
+static void au_putc(struct uart_port *port, unsigned char c)
+{
+ unsigned int status;
+
+ au_serial_out(port, UART_TX, c);
+
+ for (;;) {
+ status = au_serial_in(port, UART_LSR);
+ if (uart_lsr_tx_empty(status))
+ break;
+ cpu_relax();
+ }
+}
+
+static void au_early_serial8250_write(struct console *console,
+ const char *s, unsigned int count)
+{
+ struct earlycon_device *device = console->data;
+ struct uart_port *port = &device->port;
+
+ uart_console_write(port, s, count, au_putc);
+}
+
+static int __init early_au_setup(struct earlycon_device *dev, const char *opt)
+{
+ rt288x_setup(&dev->port);
+ dev->con->write = au_early_serial8250_write;
+
+ return 0;
+}
+OF_EARLYCON_DECLARE(palmchip, "ralink,rt2880-uart", early_au_setup);
+#endif
+
+MODULE_DESCRIPTION("RT288x/Au1xxx UART driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/tty/serial/8250/Makefile b/drivers/tty/serial/8250/Makefile
index 4fc2fc1f41b6..628b75be312e 100644
--- a/drivers/tty/serial/8250/Makefile
+++ b/drivers/tty/serial/8250/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
obj-$(CONFIG_SERIAL_8250_EM) += 8250_em.o
obj-$(CONFIG_SERIAL_8250_IOC3) += 8250_ioc3.o
obj-$(CONFIG_SERIAL_8250_OMAP) += 8250_omap.o
+obj-$(CONFIG_SERIAL_8250_RT288X) += 8250_rt288x.o
obj-$(CONFIG_SERIAL_8250_LPC18XX) += 8250_lpc18xx.o
obj-$(CONFIG_SERIAL_8250_MT6577) += 8250_mtk.o
obj-$(CONFIG_SERIAL_8250_UNIPHIER) += 8250_uniphier.o
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index cd9afd9e3018..531ec3a19dae 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -21,7 +21,7 @@ obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
obj-$(CONFIG_SERIAL_21285) += 21285.o
# Now bring in any enabled 8250/16450/16550 type drivers.
-obj-$(CONFIG_SERIAL_8250) += 8250/
+obj-y += 8250/
obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 42fc8f64f48e..eb44420b39ec 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -7,6 +7,7 @@
#ifndef _LINUX_SERIAL_8250_H
#define _LINUX_SERIAL_8250_H
+#include <linux/errno.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/platform_device.h>
@@ -211,8 +212,11 @@ void serial8250_set_isa_configurator(void (*v)(int port, struct uart_port *up,
u32 *capabilities));
#ifdef CONFIG_SERIAL_8250_RT288X
-unsigned int au_serial_in(struct uart_port *p, int offset);
-void au_serial_out(struct uart_port *p, int offset, int value);
+int rt288x_setup(struct uart_port *p);
+int au_platform_setup(struct plat_serial8250_port *p);
+#else
+static inline int rt288x_setup(struct uart_port *p) { return -ENODEV; }
+static inline int au_platform_setup(struct plat_serial8250_port *p) { return -ENODEV; }
#endif
#endif
generated by cgit (git 2.34.1) at 2026-01-02 20:58:38 +0000