ARM: S5PV210: Add serial port support

This patch adds UART serial port support for S5PV210.

Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/arch/arm/plat-s3c/include/plat/regs-serial.h b/arch/arm/plat-s3c/include/plat/regs-serial.h
index 85d8904..60d6604 100644 (file)
--- a/arch/arm/plat-s3c/include/plat/regs-serial.h
+++ b/arch/arm/plat-s3c/include/plat/regs-serial.h
@@ -194,6 +194,36 @@
 #define S3C64XX_UINTSP         0x34
 #define S3C64XX_UINTM          0x38
 
+/* Following are specific to S5PV210 and S5P6442 */
+#define S5PV210_UCON_CLKMASK   (1<<10)
+#define S5PV210_UCON_PCLK      (0<<10)
+#define S5PV210_UCON_UCLK      (1<<10)
+
+#define S5PV210_UFCON_TXTRIG0  (0<<8)
+#define S5PV210_UFCON_TXTRIG4  (1<<8)
+#define S5PV210_UFCON_TXTRIG8  (2<<8)
+#define S5PV210_UFCON_TXTRIG16 (3<<8)
+#define S5PV210_UFCON_TXTRIG32 (4<<8)
+#define S5PV210_UFCON_TXTRIG64 (5<<8)
+#define S5PV210_UFCON_TXTRIG128 (6<<8)
+#define S5PV210_UFCON_TXTRIG256 (7<<8)
+
+#define S5PV210_UFCON_RXTRIG1  (0<<4)
+#define S5PV210_UFCON_RXTRIG4  (1<<4)
+#define S5PV210_UFCON_RXTRIG8  (2<<4)
+#define S5PV210_UFCON_RXTRIG16 (3<<4)
+#define S5PV210_UFCON_RXTRIG32 (4<<4)
+#define S5PV210_UFCON_RXTRIG64 (5<<4)
+#define S5PV210_UFCON_RXTRIG128        (6<<4)
+#define S5PV210_UFCON_RXTRIG256        (7<<4)
+
+#define S5PV210_UFSTAT_TXFULL  (1<<24)
+#define S5PV210_UFSTAT_RXFULL  (1<<8)
+#define S5PV210_UFSTAT_TXMASK  (255<<16)
+#define S5PV210_UFSTAT_TXSHIFT (16)
+#define S5PV210_UFSTAT_RXMASK  (255<<0)
+#define S5PV210_UFSTAT_RXSHIFT (0)
+
 #ifndef __ASSEMBLY__
 
 /* struct s3c24xx_uart_clksrc

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index d7d687f..ebdd2b9 100644 (file)
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -459,7 +459,7 @@ config SERIAL_SAMSUNG_UARTS
        int
        depends on ARM && PLAT_S3C
        default 2 if ARCH_S3C2400
-       default 4 if ARCH_S5P6440 || ARCH_S5PC1XX || ARCH_S3C64XX || CPU_S3C2443
+       default 4 if ARCH_S5P6440 || ARCH_S5PC1XX || ARCH_S5PV210 || ARCH_S3C64XX || CPU_S3C2443
        default 3
        help
          Select the number of available UART ports for the Samsung S3C
@@ -540,6 +540,13 @@ config SERIAL_S5PC100
        help
          Serial port support for the Samsung S5PC100 SoCs
 
+config SERIAL_S5PV210
+       tristate "Samsung S5PV210 Serial port support"
+       depends on SERIAL_SAMSUNG && CPU_S5PV210
+       default y
+       help
+         Serial port support for Samsung's S5P Family of SoC's
+
 config SERIAL_MAX3100
        tristate "MAX3100 support"
        depends on SPI

diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile
index 5548fe7..6aa4723 100644 (file)
--- 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-$(CONFIG_SERIAL_S5PV210) += s5pv210.o
 obj-$(CONFIG_SERIAL_MAX3100) += max3100.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
 obj-$(CONFIG_SERIAL_MUX) += mux.o

diff --git a/drivers/serial/s5pv210.c b/drivers/serial/s5pv210.c
new file mode 100644 (file)
index 0000000..8dc0383
--- /dev/null
+++ b/drivers/serial/s5pv210.c
@@ -0,0 +1,154 @@
+/* linux/drivers/serial/s5pv210.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *             http://www.samsung.com/
+ *
+ * Based on drivers/serial/s3c6400.c
+ *
+ * Driver for Samsung S5PV210 SoC UARTs.
+ *
+ * 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 s5pv210_serial_setsource(struct uart_port *port,
+                                       struct s3c24xx_uart_clksrc *clk)
+{
+       unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+       if (strcmp(clk->name, "pclk") == 0)
+               ucon &= ~S5PV210_UCON_CLKMASK;
+       else if (strcmp(clk->name, "uclk1") == 0)
+               ucon |= S5PV210_UCON_CLKMASK;
+       else {
+               printk(KERN_ERR "unknown clock source %s\n", clk->name);
+               return -EINVAL;
+       }
+
+       wr_regl(port, S3C2410_UCON, ucon);
+       return 0;
+}
+
+
+static int s5pv210_serial_getsource(struct uart_port *port,
+                                       struct s3c24xx_uart_clksrc *clk)
+{
+       u32 ucon = rd_regl(port, S3C2410_UCON);
+
+       clk->divisor = 1;
+
+       switch (ucon & S5PV210_UCON_CLKMASK) {
+       case S5PV210_UCON_PCLK:
+               clk->name = "pclk";
+               break;
+       case S5PV210_UCON_UCLK:
+               clk->name = "uclk1";
+               break;
+       }
+
+       return 0;
+}
+
+static int s5pv210_serial_resetport(struct uart_port *port,
+                                       struct s3c2410_uartcfg *cfg)
+{
+       unsigned long ucon = rd_regl(port, S3C2410_UCON);
+
+       ucon &= S5PV210_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;
+}
+
+#define S5PV210_UART_DEFAULT_INFO(fifo_size)                   \
+               .name           = "Samsung S5PV210 UART0",      \
+               .type           = PORT_S3C6400,                 \
+               .fifosize       = fifo_size,                    \
+               .has_divslot    = 1,                            \
+               .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
+               .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
+               .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
+               .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
+               .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
+               .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
+               .get_clksrc     = s5pv210_serial_getsource,     \
+               .set_clksrc     = s5pv210_serial_setsource,     \
+               .reset_port     = s5pv210_serial_resetport
+
+static struct s3c24xx_uart_info s5p_port_fifo256 = {
+       S5PV210_UART_DEFAULT_INFO(256),
+};
+
+static struct s3c24xx_uart_info s5p_port_fifo64 = {
+       S5PV210_UART_DEFAULT_INFO(64),
+};
+
+static struct s3c24xx_uart_info s5p_port_fifo16 = {
+       S5PV210_UART_DEFAULT_INFO(16),
+};
+
+static struct s3c24xx_uart_info *s5p_uart_inf[] = {
+       [0] = &s5p_port_fifo256,
+       [1] = &s5p_port_fifo64,
+       [2] = &s5p_port_fifo16,
+       [3] = &s5p_port_fifo16,
+};
+
+/* device management */
+static int s5p_serial_probe(struct platform_device *pdev)
+{
+       return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
+}
+
+static struct platform_driver s5p_serial_drv = {
+       .probe          = s5p_serial_probe,
+       .remove         = __devexit_p(s3c24xx_serial_remove),
+       .driver         = {
+               .name   = "s5pv210-uart",
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init s5pv210_serial_console_init(void)
+{
+       return s3c24xx_serial_initconsole(&s5p_serial_drv, s5p_uart_inf);
+}
+
+console_initcall(s5pv210_serial_console_init);
+
+static int __init s5p_serial_init(void)
+{
+       return s3c24xx_serial_init(&s5p_serial_drv, *s5p_uart_inf);
+}
+
+static void __exit s5p_serial_exit(void)
+{
+       platform_driver_unregister(&s5p_serial_drv);
+}
+
+module_init(s5p_serial_init);
+module_exit(s5p_serial_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s5pv210-uart");
+MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
+MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");