blob: 036f722d9785c2901ffbaa12169f1d6bc98fae55 [file] [log] [blame]
/* Copyright 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Watchdog driver */
#ifndef __CROS_EC_WATCHDOG_H
#define __CROS_EC_WATCHDOG_H
#include <stdint.h>
#include "config.h"
/**
* Initialize the watchdog.
*
* This will cause the CPU to reboot if it has been more than 2 watchdog
* periods since watchdog_reload() has been called.
*/
int watchdog_init(void);
/**
* Display a trace with information about an expired watchdog timer
*
* This shows the location in the code where the expiration happened.
* Usually this helps locate a loop which is blocking execution of the
* watchdog task.
*
* @param excep_lr Value of lr to indicate caller return
* @param excep_sp Value of sp to indicate caller task id
*/
void watchdog_trace(uint32_t excep_lr, uint32_t excep_sp);
/**
* Watchdog has not been tickled recently warning. This function should be
* called when the watchdog is close to firing.
*/
void watchdog_warning_irq(void);
/**
* We cannot unlock the watchdog timer within 3 watch dog ticks of
* touching it per the datasheet. This is around 100ms so we should
* protect against this.
*/
void watchdog_stop_and_unlock(void);
/* Reload the watchdog counter */
#ifdef CONFIG_WATCHDOG
void watchdog_reload(void);
#else
static inline void watchdog_reload(void) { }
#endif
#endif /* __CROS_EC_WATCHDOG_H */