From: Kyungmin Park <kyungmin.p...@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.p...@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprow...@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.p...@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.p...@samsung.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:s5pc110-uart");
-- 
1.6.4

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