drivers/tty/serial/s5pv210.c

   1 /*
   2  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   3  *              http://www.samsung.com/
   4  *
   5  * Based on drivers/serial/s3c6400.c
   6  *
   7  * Driver for Samsung S5PV210 SoC UARTs.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12 */
  13
  14 #include <linux/module.h>
  15 #include <linux/ioport.h>
  16 #include <linux/io.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/init.h>
  19 #include <linux/serial_core.h>
  20 #include <linux/serial.h>
  21
  22 #include <asm/irq.h>
  23 #include <mach/hardware.h>
  24 #include <plat/regs-serial.h>
  25 #include "samsung.h"
  26
  27 static int s5pv210_serial_setsource(struct uart_port *port,
  28                                         struct s3c24xx_uart_clksrc *clk)
  29 {
  30         struct s3c2410_uartcfg *cfg = port->dev->platform_data;
  31         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  32
  33         if (cfg->flags & NO_NEED_CHECK_CLKSRC)
  34                 return 0;
  35
  36         if (strcmp(clk->name, "pclk") == 0)
  37                 ucon &= ~S5PV210_UCON_CLKMASK;
  38         else if (strcmp(clk->name, "uclk1") == 0)
  39                 ucon |= S5PV210_UCON_CLKMASK;
  40         else {
  41                 printk(KERN_ERR "unknown clock source %s\n", clk->name);
  42                 return -EINVAL;
  43         }
  44
  45         wr_regl(port, S3C2410_UCON, ucon);
  46         return 0;
  47 }
  48
  49
  50 static int s5pv210_serial_getsource(struct uart_port *port,
  51                                         struct s3c24xx_uart_clksrc *clk)
  52 {
  53         struct s3c2410_uartcfg *cfg = port->dev->platform_data;
  54         u32 ucon = rd_regl(port, S3C2410_UCON);
  55
  56         clk->divisor = 1;
  57
  58         if (cfg->flags & NO_NEED_CHECK_CLKSRC)
  59                 return 0;
  60
  61         switch (ucon & S5PV210_UCON_CLKMASK) {
  62         case S5PV210_UCON_PCLK:
  63                 clk->name = "pclk";
  64                 break;
  65         case S5PV210_UCON_UCLK:
  66                 clk->name = "uclk1";
  67                 break;
  68         }
  69
  70         return 0;
  71 }
  72
  73 static int s5pv210_serial_resetport(struct uart_port *port,
  74                                         struct s3c2410_uartcfg *cfg)
  75 {
  76         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  77
  78         ucon &= S5PV210_UCON_CLKMASK;
  79         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
  80         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  81
  82         /* reset both fifos */
  83         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  84         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  85
  86         return 0;
  87 }
  88
  89 #define S5PV210_UART_DEFAULT_INFO(fifo_size)                    \
  90                 .name           = "Samsung S5PV210 UART0",      \
  91                 .type           = PORT_S3C6400,                 \
  92                 .fifosize       = fifo_size,                    \
  93                 .has_divslot    = 1,                            \
  94                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
  95                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
  96                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
  97                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
  98                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
  99                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
 100                 .get_clksrc     = s5pv210_serial_getsource,     \
 101                 .set_clksrc     = s5pv210_serial_setsource,     \
 102                 .reset_port     = s5pv210_serial_resetport
 103
 104 static struct s3c24xx_uart_info s5p_port_fifo256 = {
 105         S5PV210_UART_DEFAULT_INFO(256),
 106 };
 107
 108 static struct s3c24xx_uart_info s5p_port_fifo64 = {
 109         S5PV210_UART_DEFAULT_INFO(64),
 110 };
 111
 112 static struct s3c24xx_uart_info s5p_port_fifo16 = {
 113         S5PV210_UART_DEFAULT_INFO(16),
 114 };
 115
 116 static struct s3c24xx_uart_info *s5p_uart_inf[] = {
 117         [0] = &s5p_port_fifo256,
 118         [1] = &s5p_port_fifo64,
 119         [2] = &s5p_port_fifo16,
 120         [3] = &s5p_port_fifo16,
 121 };
 122
 123 /* device management */
 124 static int s5p_serial_probe(struct platform_device *pdev)
 125 {
 126         return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
 127 }
 128
 129 static struct platform_driver s5p_serial_driver = {
 130         .probe          = s5p_serial_probe,
 131         .remove         = __devexit_p(s3c24xx_serial_remove),
 132         .driver         = {
 133                 .name   = "s5pv210-uart",
 134                 .owner  = THIS_MODULE,
 135         },
 136 };
 137
 138 static int __init s5pv210_serial_console_init(void)
 139 {
 140         return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf);
 141 }
 142
 143 console_initcall(s5pv210_serial_console_init);
 144
 145 static int __init s5p_serial_init(void)
 146 {
 147         return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
 148 }
 149
 150 static void __exit s5p_serial_exit(void)
 151 {
 152         platform_driver_unregister(&s5p_serial_driver);
 153 }
 154
 155 module_init(s5p_serial_init);
 156 module_exit(s5p_serial_exit);
 157
 158 MODULE_LICENSE("GPL");
 159 MODULE_ALIAS("platform:s5pv210-uart");
 160 MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
 161 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");