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>

1 files changed, 154 insertions, 0 deletions

diff --git a/drivers/serial/s5pv210.c b/drivers/serial/s5pv210.c
new file mode 100644
index 000000000000..8dc03837617b
--- /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>");