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 #include <linux/delay.h>
  23
  24 #include <asm/irq.h>
  25 #include <mach/hardware.h>
  26 #include <plat/regs-serial.h>
  27 #include "samsung.h"
  28
  29 static int s5pv210_serial_setsource(struct uart_port *port,
  30                                         struct s3c24xx_uart_clksrc *clk)
  31 {
  32         struct s3c2410_uartcfg *cfg = port->dev->platform_data;
  33         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  34
  35         if ((cfg->clocks_size) == 1)
  36                 return 0;
  37
  38         if (strcmp(clk->name, "pclk") == 0)
  39                 ucon &= ~S5PV210_UCON_CLKMASK;
  40         else if (strcmp(clk->name, "uclk1") == 0)
  41                 ucon |= S5PV210_UCON_CLKMASK;
  42         else {
  43                 printk(KERN_ERR "unknown clock source %s\n", clk->name);
  44                 return -EINVAL;
  45         }
  46
  47         wr_regl(port, S3C2410_UCON, ucon);
  48         return 0;
  49 }
  50
  51
  52 static int s5pv210_serial_getsource(struct uart_port *port,
  53                                         struct s3c24xx_uart_clksrc *clk)
  54 {
  55         struct s3c2410_uartcfg *cfg = port->dev->platform_data;
  56         u32 ucon = rd_regl(port, S3C2410_UCON);
  57
  58         clk->divisor = 1;
  59
  60         if ((cfg->clocks_size) == 1)
  61                 return 0;
  62
  63         switch (ucon & S5PV210_UCON_CLKMASK) {
  64         case S5PV210_UCON_PCLK:
  65                 clk->name = "pclk";
  66                 break;
  67         case S5PV210_UCON_UCLK:
  68                 clk->name = "uclk1";
  69                 break;
  70         }
  71
  72         return 0;
  73 }
  74
  75 extern int console_suspend_enabled;
  76 static int s5pv210_serial_resetport(struct uart_port *port,
  77                                         struct s3c2410_uartcfg *cfg)
  78 {
  79         unsigned long ucon = rd_regl(port, S3C2410_UCON);
  80
  81         ucon &= S5PV210_UCON_CLKMASK;
  82         wr_regl(port, S3C2410_UCON,  ucon | cfg->ucon);
  83         wr_regl(port, S3C2410_ULCON, cfg->ulcon);
  84
  85         /* reset both fifos */
  86         wr_regl(port, S3C2410_UFCON, cfg->ufcon | S3C2410_UFCON_RESETBOTH);
  87         wr_regl(port, S3C2410_UFCON, cfg->ufcon);
  88
  89         if (console_suspend_enabled) {
  90                 wr_regl(port, S3C64XX_UINTM, 0xf);
  91                 wr_regl(port, S3C64XX_UINTP, 0xf);
  92         }
  93
  94         /* It is need to delay When reset FIFO register */
  95         udelay(10);
  96
  97         return 0;
  98 }
  99
 100 #define S5PV210_UART_DEFAULT_INFO(fifo_size)                    \
 101                 .name           = "Samsung S5PV210 UART0",      \
 102                 .type           = PORT_S3C6400,                 \
 103                 .fifosize       = fifo_size,                    \
 104                 .has_divslot    = 1,                            \
 105                 .rx_fifomask    = S5PV210_UFSTAT_RXMASK,        \
 106                 .rx_fifoshift   = S5PV210_UFSTAT_RXSHIFT,       \
 107                 .rx_fifofull    = S5PV210_UFSTAT_RXFULL,        \
 108                 .tx_fifofull    = S5PV210_UFSTAT_TXFULL,        \
 109                 .tx_fifomask    = S5PV210_UFSTAT_TXMASK,        \
 110                 .tx_fifoshift   = S5PV210_UFSTAT_TXSHIFT,       \
 111                 .get_clksrc     = s5pv210_serial_getsource,     \
 112                 .set_clksrc     = s5pv210_serial_setsource,     \
 113                 .reset_port     = s5pv210_serial_resetport
 114
 115 static struct s3c24xx_uart_info s5p_port_fifo256 = {
 116         S5PV210_UART_DEFAULT_INFO(256),
 117 };
 118
 119 static struct s3c24xx_uart_info s5p_port_fifo64 = {
 120         S5PV210_UART_DEFAULT_INFO(64),
 121 };
 122
 123 static struct s3c24xx_uart_info s5p_port_fifo16 = {
 124         S5PV210_UART_DEFAULT_INFO(16),
 125 };
 126
 127 static struct s3c24xx_uart_info *s5p_uart_inf[] = {
 128         [0] = &s5p_port_fifo256,
 129         [1] = &s5p_port_fifo64,
 130         [2] = &s5p_port_fifo16,
 131         [3] = &s5p_port_fifo16,
 132         [4] = &s5p_port_fifo16,
 133 };
 134
 135 /* device management */
 136 static int s5p_serial_probe(struct platform_device *pdev)
 137 {
 138         return s3c24xx_serial_probe(pdev, s5p_uart_inf[pdev->id]);
 139 }
 140
 141 static struct platform_driver s5p_serial_driver = {
 142         .probe          = s5p_serial_probe,
 143         .remove         = __devexit_p(s3c24xx_serial_remove),
 144         .driver         = {
 145                 .name   = "s5pv210-uart",
 146                 .owner  = THIS_MODULE,
 147         },
 148 };
 149
 150 static int __init s5pv210_serial_console_init(void)
 151 {
 152         return s3c24xx_serial_initconsole(&s5p_serial_driver, s5p_uart_inf);
 153 }
 154
 155 console_initcall(s5pv210_serial_console_init);
 156
 157 static int __init s5p_serial_init(void)
 158 {
 159         return s3c24xx_serial_init(&s5p_serial_driver, *s5p_uart_inf);
 160 }
 161
 162 static void __exit s5p_serial_exit(void)
 163 {
 164         platform_driver_unregister(&s5p_serial_driver);
 165 }
 166
 167 module_init(s5p_serial_init);
 168 module_exit(s5p_serial_exit);
 169
 170 MODULE_LICENSE("GPL");
 171 MODULE_ALIAS("platform:s5pv210-uart");
 172 MODULE_DESCRIPTION("Samsung S5PV210 UART Driver support");
 173 MODULE_AUTHOR("Thomas Abraham <thomas.ab@samsung.com>");