drivers/watchdog/s5p_wdt.c

   1 /*
   2  * Copyright (C) 2012 Samsung Electronics
   3  * Minkyu Kang <mk7.kang@samsung.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <asm/io.h>
  10 #include <asm/arch/watchdog.h>
  11
  12 #define PRESCALER_VAL 255
  13
  14 void wdt_stop(void)
  15 {
  16         struct s5p_watchdog *wdt =
  17                 (struct s5p_watchdog *)samsung_get_base_watchdog();
  18         unsigned int wtcon;
  19
  20         wtcon = readl(&wdt->wtcon);
  21         wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET);
  22
  23         writel(wtcon, &wdt->wtcon);
  24 }
  25
  26 void wdt_start(unsigned int timeout)
  27 {
  28         struct s5p_watchdog *wdt =
  29                 (struct s5p_watchdog *)samsung_get_base_watchdog();
  30         unsigned int wtcon;
  31
  32         wdt_stop();
  33
  34         wtcon = readl(&wdt->wtcon);
  35         wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128));
  36         wtcon &= ~WTCON_INT;
  37         wtcon |= WTCON_RESET;
  38         wtcon |= WTCON_PRESCALER(PRESCALER_VAL);
  39
  40         writel(timeout, &wdt->wtdat);
  41         writel(timeout, &wdt->wtcnt);
  42         writel(wtcon, &wdt->wtcon);
  43 }