drivers/watchdog/s5p_wdt.c

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