drivers/tty/serial/s3c2410.c

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