drivers/tty/serial/s3c2400.c

   1 /*
   2  * Driver for Samsung SoC onboard UARTs.
   3  *
   4  * Ben Dooks, Copyright (c) 2003-2005 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
  17 #include <asm/irq.h>
  18
  19 #include <mach/hardware.h>
  20
  21 #include <plat/regs-serial.h>
  22 #include <mach/regs-gpio.h>
  23
  24 #include "samsung.h"
  25
  26 static int s3c2400_serial_getsource(struct uart_port *port,
  27                                     struct s3c24xx_uart_clksrc *clk)
  28 {
  29         clk->divisor = 1;
  30         clk->name = "pclk";
  31
  32         return 0;
  33 }
  34
  35 static int s3c2400_serial_setsource(struct uart_port *port,
  36                                     struct s3c24xx_uart_clksrc *clk)
  37 {
  38         return 0;
  39 }
  40
  41 static int s3c2400_serial_resetport(struct uart_port *port,
  42                                     struct s3c2410_uartcfg *cfg)
  43 {
  44         dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
  45             port, port->mapbase, cfg);
  46
  47         wr_regl(port, S3C2410_UCON,  cfg->ucon);
  48         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  49
  50         /* reset both fifos */
  51
  52         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  53         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  54
  55         return 0;
  56 }
  57
  58 static struct s3c24xx_uart_info s3c2400_uart_inf = {
  59         .name           = "Samsung S3C2400 UART",
  60         .type           = PORT_S3C2400,
  61         .fifosize       = 16,
  62         .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
  63         .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
  64         .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
  65         .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
  66         .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
  67         .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
  68         .get_clksrc     = s3c2400_serial_getsource,
  69         .set_clksrc     = s3c2400_serial_setsource,
  70         .reset_port     = s3c2400_serial_resetport,
  71 };
  72
  73 static int s3c2400_serial_probe(struct platform_device *dev)
  74 {
  75         return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
  76 }
  77
  78 static struct platform_driver s3c2400_serial_driver = {
  79         .probe          = s3c2400_serial_probe,
  80         .remove         = __devexit_p(s3c24xx_serial_remove),
  81         .driver         = {
  82                 .name   = "s3c2400-uart",
  83                 .owner  = THIS_MODULE,
  84         },
  85 };
  86
  87 s3c24xx_console_init(&s3c2400_serial_driver, &s3c2400_uart_inf);
  88
  89 static inline int s3c2400_serial_init(void)
  90 {
  91         return s3c24xx_serial_init(&s3c2400_serial_driver, &s3c2400_uart_inf);
  92 }
  93
  94 static inline void s3c2400_serial_exit(void)
  95 {
  96         platform_driver_unregister(&s3c2400_serial_driver);
  97 }
  98
  99 module_init(s3c2400_serial_init);
 100 module_exit(s3c2400_serial_exit);
 101
 102 MODULE_LICENSE("GPL v2");
 103 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 104 MODULE_DESCRIPTION("Samsung S3C2400 SoC Serial port driver");
 105 MODULE_ALIAS("platform:s3c2400-uart");