drivers/serial/s5pv210.c

   1 /* linux/drivers/serial/s5pv210.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com/
   5  *
   6  * Based on drivers/serial/s3c6400.c
   7  *
   8  * Driver for Samsung S5PV210 SoC UARTs.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13 */
  14
  15 #include <linux/module.h>
  16 #include <linux/ioport.h>
  17 #include <linux/io.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/init.h>
  20 #include <linux/serial_core.h>
  21 #include <linux/serial.h>
  22
  23 #include <asm/irq.h>
  24 #include <mach/hardware.h>
  25 #include <plat/regs-serial.h>
  26 #include "samsung.h"
  27
  28 static int s5pv210_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, "pclk") == 0)
  34                 ucon &= ~S5PV210_UCON_CLKMASK;
  35         else if (strcmp(clk->name, "uclk1") == 0)
  36                 ucon |= S5PV210_UCON_CLKMASK;
  37         else {
  38                 printk(KERN_ERR "unknown clock source %s\n", clk->name);
  39                 return -EINVAL;
  40         }
  41
  42         wr_regl(port, S3C2410_UCON, ucon);
  43         return 0;
  44 }
  45
  46
  47 static int s5pv210_serial_getsource(struct uart_port *port,
  48                                         struct s3c24xx_uart_clksrc *clk)
  49 {
  50         u32 ucon = rd_regl(port, S3C2410_UCON);
  51
  52         clk->divisor = 1;
  53
  54         switch (ucon & S5PV210_UCON_CLKMASK) {
  55         case S5PV210_UCON_PCLK:
  56                 clk->name = "pclk";
  57                 break;
  58         case S5PV210_UCON_UCLK:
  59                 clk->name = "uclk1";
  60                 break;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static int s5pv210_serial_resetport(struct uart_port *port,
  67                                         struct s3c2410_uartcfg *cfg)
  68 {
  69         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  70
  71         ucon &= S5PV210_UCON_CLKMASK;
  72         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
  73         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  74
  75         /* reset both fifos */
  76         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  77         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  78
  79         return 0;
  80 }
  81
  82 #define S5PV210_UART_DEFAULT_INFO(fifo_size)                    \
  83                 .name           = "Samsung S5PV210 UART0",      \
  84                 .type           = PORT_S3C6400,                 \
  85                 .fifosize       = fifo_size,                    \
  86                 .has_divslot    = 1,                            \
  87                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
  88                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
  89                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
  90                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
  91                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
  92                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
  93                 .get_clksrc     = s5pv210_serial_getsource,     \
  94                 .set_clksrc     = s5pv210_serial_setsource,     \
  95                 .reset_port     = s5pv210_serial_resetport
  96
  97 static struct s3c24xx_uart_info s5p_port_fifo256 = {
  98         S5PV210_UART_DEFAULT_INFO(256),
  99 };
 100
 101 static struct s3c24xx_uart_info s5p_port_fifo64 = {
 102         S5PV210_UART_DEFAULT_INFO(64),
 103 };
 104
 105 static struct s3c24xx_uart_info s5p_port_fifo16 = {
 106         S5PV210_UART_DEFAULT_INFO(16),
 107 };
 108
 109 static struct s3c24xx_uart_info *s5p_uart_inf[] = {
 110         [0] = &s5p_port_fifo256,
 111         [1] = &s5p_port_fifo64,
 112         [2] = &s5p_port_fifo16,
 113         [3] = &s5p_port_fifo16,
 114 };
 115
 116 /* device management */
 117 static int s5p_serial_probe(struct platform_device *pdev)
 118 {
 119         return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
 120 }
 121
 122 static struct platform_driver s5p_serial_driver = {
 123         .probe          = s5p_serial_probe,
 124         .remove         = __devexit_p(s3c24xx_serial_remove),
 125         .driver         = {
 126                 .name   = "s5pv210-uart",
 127                 .owner  = THIS_MODULE,
 128         },
 129 };
 130
 131 static int __init s5pv210_serial_console_init(void)
 132 {
 133         return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf);
 134 }
 135
 136 console_initcall(s5pv210_serial_console_init);
 137
 138 static int __init s5p_serial_init(void)
 139 {
 140         return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
 141 }
 142
 143 static void __exit s5p_serial_exit(void)
 144 {
 145         platform_driver_unregister(&s5p_serial_driver);
 146 }
 147
 148 module_init(s5p_serial_init);
 149 module_exit(s5p_serial_exit);
 150
 151 MODULE_LICENSE("GPL");
 152 MODULE_ALIAS("platform:s5pv210-uart");
 153 MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
 154 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");