Eric Lee / smarc-uboot

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drivers/watchdog/s5p_wdt.c 880 Bytes
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851db35e2   Minkyu Kang   S5P: support gene... 
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  /*
   * Copyright (C) 2012 Samsung Electronics
   * Minkyu Kang <mk7.kang@samsung.com>
   *
3765b3e7b   Wolfgang Denk   Coding Style clea... 
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   * SPDX-License-Identifier:	GPL-2.0+
851db35e2   Minkyu Kang   S5P: support gene... 
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   */
  
  #include <common.h>
  #include <asm/io.h>
  #include <asm/arch/watchdog.h>
  
  #define PRESCALER_VAL 255
  
  void wdt_stop(void)
  {
  	struct s5p_watchdog *wdt =
  		(struct s5p_watchdog *)samsung_get_base_watchdog();
  	unsigned int wtcon;
  
  	wtcon = readl(&wdt->wtcon);
  	wtcon &= ~(WTCON_EN | WTCON_INT | WTCON_RESET);
  
  	writel(wtcon, &wdt->wtcon);
  }
  
  void wdt_start(unsigned int timeout)
  {
  	struct s5p_watchdog *wdt =
  		(struct s5p_watchdog *)samsung_get_base_watchdog();
  	unsigned int wtcon;
  
  	wdt_stop();
  
  	wtcon = readl(&wdt->wtcon);
  	wtcon |= (WTCON_EN | WTCON_CLK(WTCON_CLK_128));
  	wtcon &= ~WTCON_INT;
  	wtcon |= WTCON_RESET;
  	wtcon |= WTCON_PRESCALER(PRESCALER_VAL);
  
  	writel(timeout, &wdt->wtdat);
  	writel(timeout, &wdt->wtcnt);
  	writel(wtcon, &wdt->wtcon);
  }