drivers/serial/s3c2410.c

   1 /* linux/drivers/serial/s3c2410.c
   2  *
   3  * Driver for Samsung S3C2410 SoC onboard UARTs.
   4  *
   5  * Ben Dooks, Copyright (c) 2003-2005,2008 Simtec Electronics
   6  *      http://armlinux.simtec.co.uk/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/module.h>
  14 #include <linux/ioport.h>
  15 #include <linux/io.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/init.h>
  18 #include <linux/serial_core.h>
  19 #include <linux/serial.h>
  20
  21 #include <asm/irq.h>
  22 #include <mach/hardware.h>
  23
  24 #include <plat/regs-serial.h>
  25 #include <mach/regs-gpio.h>
  26
  27 #include "samsung.h"
  28
  29 static int s3c2410_serial_setsource(struct uart_port *port,
  30                                     struct s3c24xx_uart_clksrc *clk)
  31 {
  32         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  33
  34         if (strcmp(clk->name, "uclk") == 0)
  35                 ucon |= S3C2410_UCON_UCLK;
  36         else
  37                 ucon &= ~S3C2410_UCON_UCLK;
  38
  39         wr_regl(port, S3C2410_UCON, ucon);
  40         return 0;
  41 }
  42
  43 static int s3c2410_serial_getsource(struct uart_port *port,
  44                                     struct s3c24xx_uart_clksrc *clk)
  45 {
  46         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  47
  48         clk->divisor = 1;
  49         clk->name = (ucon & S3C2410_UCON_UCLK) ? "uclk" : "pclk";
  50
  51         return 0;
  52 }
  53
  54 static int s3c2410_serial_resetport(struct uart_port *port,
  55                                     struct s3c2410_uartcfg *cfg)
  56 {
  57         dbg("s3c2410_serial_resetport: port=%p (%08lx), cfg=%p\n",
  58             port, port->mapbase, cfg);
  59
  60         wr_regl(port, S3C2410_UCON,  cfg->ucon);
  61         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  62
  63         /* reset both fifos */
  64
  65         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  66         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  67
  68         return 0;
  69 }
  70
  71 static struct s3c24xx_uart_info s3c2410_uart_inf = {
  72         .name           = "Samsung S3C2410 UART",
  73         .type           = PORT_S3C2410,
  74         .fifosize       = 16,
  75         .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
  76         .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
  77         .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
  78         .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
  79         .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
  80         .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
  81         .get_clksrc     = s3c2410_serial_getsource,
  82         .set_clksrc     = s3c2410_serial_setsource,
  83         .reset_port     = s3c2410_serial_resetport,
  84 };
  85
  86 static int s3c2410_serial_probe(struct platform_device *dev)
  87 {
  88         return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
  89 }
  90
  91 static struct platform_driver s3c2410_serial_driver = {
  92         .probe          = s3c2410_serial_probe,
  93         .remove         = __devexit_p(s3c24xx_serial_remove),
  94         .driver         = {
  95                 .name   = "s3c2410-uart",
  96                 .owner  = THIS_MODULE,
  97         },
  98 };
  99
 100 s3c24xx_console_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
 101
 102 static int __init s3c2410_serial_init(void)
 103 {
 104         return s3c24xx_serial_init(&s3c2410_serial_driver, &s3c2410_uart_inf);
 105 }
 106
 107 static void __exit s3c2410_serial_exit(void)
 108 {
 109         platform_driver_unregister(&s3c2410_serial_driver);
 110 }
 111
 112 module_init(s3c2410_serial_init);
 113 module_exit(s3c2410_serial_exit);
 114
 115 MODULE_LICENSE("GPL v2");
 116 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 117 MODULE_DESCRIPTION("Samsung S3C2410 SoC Serial port driver");
 118 MODULE_ALIAS("platform:s3c2410-uart");