release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/serial/s3c24a0.c

   1 /* linux/drivers/serial/s3c24a0.c
   2  *
   3  * Driver for Samsung S3C24A0 SoC onboard UARTs.
   4  *
   5  * Based on drivers/serial/s3c2410.c
   6  *
   7  * Author: Sandeep Patil <sandeep.patil@azingo.com>
   8  *
   9  * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
  10  *      http://armlinux.simtec.co.uk/
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15 */
  16
  17 #include <linux/module.h>
  18 #include <linux/ioport.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/init.h>
  21 #include <linux/serial_core.h>
  22 #include <linux/serial.h>
  23 #include <linux/io.h>
  24 #include <linux/irq.h>
  25
  26 #include <mach/hardware.h>
  27
  28 #include <plat/regs-serial.h>
  29 #include <mach/regs-gpio.h>
  30
  31 #include "samsung.h"
  32
  33 static int s3c24a0_serial_setsource(struct uart_port *port,
  34                                     struct s3c24xx_uart_clksrc *clk)
  35 {
  36         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  37
  38         if (strcmp(clk->name, "uclk") == 0)
  39                 ucon |= S3C2410_UCON_UCLK;
  40         else
  41                 ucon &= ~S3C2410_UCON_UCLK;
  42
  43         wr_regl(port, S3C2410_UCON, ucon);
  44         return 0;
  45 }
  46
  47 static int s3c24a0_serial_getsource(struct uart_port *port,
  48                                     struct s3c24xx_uart_clksrc *clk)
  49 {
  50         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  51
  52         clk->divisor = 1;
  53         clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
  54
  55         return 0;
  56 }
  57
  58 static int s3c24a0_serial_resetport(struct uart_port *port,
  59                                     struct s3c2410_uartcfg *cfg)
  60 {
  61         dbg("s3c24a0_serial_resetport: port=%p (%08lx), cfg=%p\n",
  62             port, port->mapbase, cfg);
  63
  64         wr_regl(port, S3C2410_UCON,  cfg->ucon);
  65         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  66
  67         /* reset both fifos */
  68
  69         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  70         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  71
  72         return 0;
  73 }
  74
  75 static struct s3c24xx_uart_info s3c24a0_uart_inf = {
  76         .name           = "Samsung S3C24A0 UART",
  77         .type           = PORT_S3C2410,
  78         .fifosize       = 16,
  79         .rx_fifomask    = S3C24A0_UFSTAT_RXMASK,
  80         .rx_fifoshift   = S3C24A0_UFSTAT_RXSHIFT,
  81         .rx_fifofull    = S3C24A0_UFSTAT_RXFULL,
  82         .tx_fifofull    = S3C24A0_UFSTAT_TXFULL,
  83         .tx_fifomask    = S3C24A0_UFSTAT_TXMASK,
  84         .tx_fifoshift   = S3C24A0_UFSTAT_TXSHIFT,
  85         .get_clksrc     = s3c24a0_serial_getsource,
  86         .set_clksrc     = s3c24a0_serial_setsource,
  87         .reset_port     = s3c24a0_serial_resetport,
  88 };
  89
  90 static int s3c24a0_serial_probe(struct platform_device *dev)
  91 {
  92         return s3c24xx_serial_probe(dev, &s3c24a0_uart_inf);
  93 }
  94
  95 static struct platform_driver s3c24a0_serial_driver = {
  96         .probe          = s3c24a0_serial_probe,
  97         .remove         = __devexit_p(s3c24xx_serial_remove),
  98         .driver         = {
  99                 .name   = "s3c24a0-uart",
 100                 .owner  = THIS_MODULE,
 101         },
 102 };
 103
 104 s3c24xx_console_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf);
 105
 106 static int __init s3c24a0_serial_init(void)
 107 {
 108         return s3c24xx_serial_init(&s3c24a0_serial_driver, &s3c24a0_uart_inf);
 109 }
 110
 111 static void __exit s3c24a0_serial_exit(void)
 112 {
 113         platform_driver_unregister(&s3c24a0_serial_driver);
 114 }
 115
 116 module_init(s3c24a0_serial_init);
 117 module_exit(s3c24a0_serial_exit);