drivers/serial/s3c2400.c

   1 /* linux/drivers/serial/s3c240.c
   2  *
   3  * Driver for Samsung SoC onboard UARTs.
   4  *
   5  * Ben Dooks, Copyright (c) 2003-2005 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
  18 #include <asm/irq.h>
  19
  20 #include <mach/hardware.h>
  21
  22 #include <plat/regs-serial.h>
  23 #include <mach/regs-gpio.h>
  24
  25 #include "samsung.h"
  26
  27 static int s3c2400_serial_getsource(struct uart_port *port,
  28                                     struct s3c24xx_uart_clksrc *clk)
  29 {
  30         clk->divisor = 1;
  31         clk->name = "pclk";
  32
  33         return 0;
  34 }
  35
  36 static int s3c2400_serial_setsource(struct uart_port *port,
  37                                     struct s3c24xx_uart_clksrc *clk)
  38 {
  39         return 0;
  40 }
  41
  42 static int s3c2400_serial_resetport(struct uart_port *port,
  43                                     struct s3c2410_uartcfg *cfg)
  44 {
  45         dbg("s3c2400_serial_resetport: port=%p (%08lx), cfg=%p\n",
  46             port, port->mapbase, cfg);
  47
  48         wr_regl(port, S3C2410_UCON,  cfg->ucon);
  49         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  50
  51         /* reset both fifos */
  52
  53         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  54         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  55
  56         return 0;
  57 }
  58
  59 static struct s3c24xx_uart_info s3c2400_uart_inf = {
  60         .name           = "Samsung S3C2400 UART",
  61         .type           = PORT_S3C2400,
  62         .fifosize       = 16,
  63         .rx_fifomask    = S3C2410_UFSTAT_RXMASK,
  64         .rx_fifoshift   = S3C2410_UFSTAT_RXSHIFT,
  65         .rx_fifofull    = S3C2410_UFSTAT_RXFULL,
  66         .tx_fifofull    = S3C2410_UFSTAT_TXFULL,
  67         .tx_fifomask    = S3C2410_UFSTAT_TXMASK,
  68         .tx_fifoshift   = S3C2410_UFSTAT_TXSHIFT,
  69         .get_clksrc     = s3c2400_serial_getsource,
  70         .set_clksrc     = s3c2400_serial_setsource,
  71         .reset_port     = s3c2400_serial_resetport,
  72 };
  73
  74 static int s3c2400_serial_probe(struct platform_device *dev)
  75 {
  76         return s3c24xx_serial_probe(dev, &s3c2400_uart_inf);
  77 }
  78
  79 static struct platform_driver s3c2400_serial_drv = {
  80         .probe          = s3c2400_serial_probe,
  81         .remove         = s3c24xx_serial_remove,
  82         .driver         = {
  83                 .name   = "s3c2400-uart",
  84                 .owner  = THIS_MODULE,
  85         },
  86 };
  87
  88 s3c24xx_console_init(&s3c2400_serial_drv, &s3c2400_uart_inf);
  89
  90 static inline int s3c2400_serial_init(void)
  91 {
  92         return s3c24xx_serial_init(&s3c2400_serial_drv, &s3c2400_uart_inf);
  93 }
  94
  95 static inline void s3c2400_serial_exit(void)
  96 {
  97         platform_driver_unregister(&s3c2400_serial_drv);
  98 }
  99
 100 module_init(s3c2400_serial_init);
 101 module_exit(s3c2400_serial_exit);
 102
 103 MODULE_LICENSE("GPL v2");
 104 MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
 105 MODULE_DESCRIPTION("Samsung S3C2400 SoC Serial port driver");
 106 MODULE_ALIAS("platform:s3c2400-uart");