[PATCH 09/20] drivers: serial: add support for Samsung S5PC110 SoC uart
Marek Szyprowski
m.szyprowski at samsung.com
Fri Nov 20 08:42:41 EST 2009
From: Kyungmin Park <kyungmin.park at samsung.com>
Samsung S5PC110 SoCs have UART that differs a bit from the one known
from the previous Samsung SoCs. This patch adds support for this new
driver.
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
arch/arm/plat-s3c/include/plat/regs-serial.h | 31 ++++++
drivers/serial/Kconfig | 7 ++
drivers/serial/Makefile | 1 +
drivers/serial/s5pc110.c | 143 ++++++++++++++++++++++++++
4 files changed, 182 insertions(+), 0 deletions(-)
create mode 100644 drivers/serial/s5pc110.c
diff --git a/arch/arm/plat-s3c/include/plat/regs-serial.h b/arch/arm/plat-s3c/include/plat/regs-serial.h
index 66af75a..910cfba 100644
--- a/arch/arm/plat-s3c/include/plat/regs-serial.h
+++ b/arch/arm/plat-s3c/include/plat/regs-serial.h
@@ -194,6 +194,37 @@
#define S3C64XX_UINTSP 0x34
#define S3C64XX_UINTM 0x38
+/* S5PC110 UCON */
+#define S5PC110_UCON_CLKMASK (1<<10)
+#define S5PC110_UCON_PCLK (0<<10)
+#define S5PC110_UCON_SCLK_UART (1<<10)
+
+/* S5PC110 FIFO trigger levels */
+#define S5PC110_UFCON_RXTRIG1 (0<<4)
+#define S5PC110_UFCON_RXTRIG4 (1<<4)
+#define S5PC110_UFCON_RXTRIG8 (2<<4)
+#define S5PC110_UFCON_RXTRIG16 (3<<4)
+#define S5PC110_UFCON_RXTRIG32 (4<<4)
+#define S5PC110_UFCON_RXTRIG64 (5<<4)
+#define S5PC110_UFCON_RXTRIG128 (6<<4)
+#define S5PC110_UFCON_RXTRIG256 (7<<4)
+
+#define S5PC110_UFCON_TXTRIG1 (0<<8)
+#define S5PC110_UFCON_TXTRIG4 (1<<8)
+#define S5PC110_UFCON_TXTRIG8 (2<<8)
+#define S5PC110_UFCON_TXTRIG16 (3<<8)
+#define S5PC110_UFCON_TXTRIG32 (4<<8)
+#define S5PC110_UFCON_TXTRIG64 (5<<8)
+#define S5PC110_UFCON_TXTRIG128 (6<<8)
+#define S5PC110_UFCON_TXTRIG256 (7<<8)
+
+#define S5PC110_UFSTAT_TXFULL (1<<24)
+#define S5PC110_UFSTAT_RXFULL (1<<8)
+#define S5PC110_UFSTAT_TXSHIFT (16)
+#define S5PC110_UFSTAT_RXSHIFT (0)
+#define S5PC110_UFSTAT_TXMASK (255<<16)
+#define S5PC110_UFSTAT_RXMASK (255)
+
#ifndef __ASSEMBLY__
/* struct s3c24xx_uart_clksrc
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index e522572..d119cac 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -540,6 +540,13 @@ config SERIAL_S5PC100
help
Serial port support for the Samsung S5PC100 SoCs
+config SERIAL_S5PC110
+ tristate "Samsung S5PC110 Serial port support"
+ depends on SERIAL_SAMSUNG && CPU_S5PC110
+ default y
+ help
+ Serial port support for the Samsung S5PC110 SoCs
+
config SERIAL_MAX3100
tristate "MAX3100 support"
depends on SPI
diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index d21d5dd..43d6123 100644
--- a/drivers/serial/Makefile
+++ b/drivers/serial/Makefile
@@ -45,6 +45,7 @@ obj-$(CONFIG_SERIAL_S3C2440) += s3c2440.o
obj-$(CONFIG_SERIAL_S3C24A0) += s3c24a0.o
obj-$(CONFIG_SERIAL_S3C6400) += s3c6400.o
obj-$(CONFIG_SERIAL_S5PC100) += s3c6400.o
+obj-$(CONFIG_SERIAL_S5PC110) += s5pc110.o
obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
obj-$(CONFIG_SERIAL_MUX) += mux.o
diff --git a/drivers/serial/s5pc110.c b/drivers/serial/s5pc110.c
new file mode 100644
index 0000000..1e1e229
--- /dev/null
+++ b/drivers/serial/s5pc110.c
@@ -0,0 +1,143 @@
+/*
+ * linux/drivers/serial/s5pc110.c
+ *
+ * Driver for Samsung S5PC110 SoC onboard UARTs.
+ *
+ * Copyright 2009 Samsung Electronics
+ * Kyungin Park <kyungmin.park at samsung.com>
+ *
+ * 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 <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+
+#include <asm/irq.h>
+#include <mach/hardware.h>
+
+#include <plat/regs-serial.h>
+
+#include "samsung.h"
+
+static int s5pc110_serial_setsource(struct uart_port *port,
+ struct s3c24xx_uart_clksrc *clk)
+{
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+ if (strcmp(clk->name, "uclk0") == 0)
+ ucon |= S5PC110_UCON_SCLK_UART;
+ else if (strcmp(clk->name, "pclk") == 0)
+ /* See notes about transitioning from UCLK to PCLK */
+ ucon &= ~S5PC110_UCON_SCLK_UART;
+ else {
+ printk(KERN_ERR "unknown clock source %s\n", clk->name);
+ return -EINVAL;
+ }
+
+ wr_regl(port, S3C2410_UCON, ucon);
+ return 0;
+}
+
+static int s5pc110_serial_getsource(struct uart_port *port,
+ struct s3c24xx_uart_clksrc *clk)
+{
+ u32 ucon = rd_regl(port, S3C2410_UCON);
+
+ clk->divisor = 1;
+
+ switch (ucon & S5PC110_UCON_CLKMASK) {
+ case S5PC110_UCON_SCLK_UART:
+ clk->name = "uclk0";
+ break;
+
+ case S5PC110_UCON_PCLK:
+ clk->name = "pclk";
+ break;
+ }
+
+ return 0;
+}
+
+static int s5pc110_serial_resetport(struct uart_port *port,
+ struct s3c2410_uartcfg *cfg)
+{
+ unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+ dbg("s5pc110_serial_resetport: port=%p (%08lx), cfg=%p\n",
+ port, port->mapbase, cfg);
+
+ /* ensure we don't change the clock settings... */
+
+ ucon &= S5PC110_UCON_CLKMASK;
+
+ wr_regl(port, S3C2410_UCON, ucon | cfg->ucon);
+ wr_regl(port, S3C2410_ULCON, cfg->ulcon);
+
+ /* reset both fifos */
+
+ wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
+ wr_regl(port, S3C2410_UFCON, cfg->ufcon);
+
+ return 0;
+}
+
+static struct s3c24xx_uart_info s5pc110_uart_inf = {
+ .name = "Samsung S5PC110 UART",
+ .type = PORT_S3C6400,
+ .fifosize = 16,
+ .has_divslot = 1,
+ .rx_fifomask = S5PC110_UFSTAT_RXMASK,
+ .rx_fifoshift = S5PC110_UFSTAT_RXSHIFT,
+ .rx_fifofull = S5PC110_UFSTAT_RXFULL,
+ .tx_fifofull = S5PC110_UFSTAT_TXFULL,
+ .tx_fifomask = S5PC110_UFSTAT_TXMASK,
+ .tx_fifoshift = S5PC110_UFSTAT_TXSHIFT,
+ .get_clksrc = s5pc110_serial_getsource,
+ .set_clksrc = s5pc110_serial_setsource,
+ .reset_port = s5pc110_serial_resetport,
+};
+
+/* device management */
+
+static int s5pc110_serial_probe(struct platform_device *dev)
+{
+ dbg("s5pc110_serial_probe: dev=%p\n", dev);
+
+ return s3c24xx_serial_probe(dev, &s5pc110_uart_inf);
+}
+
+static struct platform_driver s5pc110_serial_driver = {
+ .probe = s5pc110_serial_probe,
+ .remove = __devexit_p(s3c24xx_serial_remove),
+ .driver = {
+ .name = "s5pc110-uart",
+ .owner = THIS_MODULE,
+ },
+};
+
+s3c24xx_console_init(&s5pc110_serial_driver, &s5pc110_uart_inf);
+
+static int __init s5pc110_serial_init(void)
+{
+ return s3c24xx_serial_init(&s5pc110_serial_driver, &s5pc110_uart_inf);
+}
+
+static void __exit s5pc110_serial_exit(void)
+{
+ platform_driver_unregister(&s5pc110_serial_driver);
+}
+
+module_init(s5pc110_serial_init);
+module_exit(s5pc110_serial_exit);
+
+MODULE_DESCRIPTION("Samsung S5PC110 SoC Serial port driver");
+MODULE_AUTHOR("Kyungmin Park <kyungmin.park at samsung.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s5pc110-uart");
--
1.6.4
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