LXR linux/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
  29static 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
  43static 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
  54static 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
  71static 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
  86static int s3c2410_serial_probe(struct platform_device *dev)
  87{
  88        return s3c24xx_serial_probe(dev, &s3c2410_uart_inf);
  89}
  90
  91static struct platform_driver s3c2410_serial_drv = {
  92        .probe          = s3c2410_serial_probe,
  93        .remove         = s3c24xx_serial_remove,
  94        .driver         = {
  95                .name   = "s3c2410-uart",
  96                .owner  = THIS_MODULE,
  97        },
  98};
  99
 100s3c24xx_console_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
 101
 102static int __init s3c2410_serial_init(void)
 103{
 104        return s3c24xx_serial_init(&s3c2410_serial_drv, &s3c2410_uart_inf);
 105}
 106
 107static void __exit s3c2410_serial_exit(void)
 108{
 109        platform_driver_unregister(&s3c2410_serial_drv);
 110}
 111
 112module_init(s3c2410_serial_init);
 113module_exit(s3c2410_serial_exit);
 114
 115MODULE_LICENSE("GPL v2");
 116MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 117MODULE_DESCRIPTION("Samsung S3C2410 SoC Serial port driver");
 118MODULE_ALIAS("platform:s3c2410-uart");
 119