LXR linux/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) 2003-2005,2008 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
  33static 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
  47static 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
  58static 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
  75static 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
  90static int s3c24a0_serial_probe(struct platform_device *dev)
  91{
  92        return s3c24xx_serial_probe(dev, &s3c24a0_uart_inf);
  93}
  94
  95static struct platform_driver s3c24a0_serial_drv = {
  96        .probe          = s3c24a0_serial_probe,
  97        .remove         = s3c24xx_serial_remove,
  98        .driver         = {
  99                .name   = "s3c24a0-uart",
 100                .owner  = THIS_MODULE,
 101        },
 102};
 103
 104s3c24xx_console_init(&s3c24a0_serial_drv, &s3c24a0_uart_inf);
 105
 106static int __init s3c24a0_serial_init(void)
 107{
 108        return s3c24xx_serial_init(&s3c24a0_serial_drv, &s3c24a0_uart_inf);
 109}
 110
 111static void __exit s3c24a0_serial_exit(void)
 112{
 113        platform_driver_unregister(&s3c24a0_serial_drv);
 114}
 115
 116module_init(s3c24a0_serial_init);
 117module_exit(s3c24a0_serial_exit);
 118
 119