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/* Copyright (c) 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
/* Watchdog period in ms; see also AUX_TIMER_PERIOD_MS */
#define WATCHDOG_PERIOD_MS 1600
/*
* Fire auxiliary timer 500ms before watchdog timer expires. This leaves
* some time for debug trace to be printed; must be at least twice
* HOOK_TICK_INTERVAL.
*/
#define AUX_TIMER_PERIOD_MS (WATCHDOG_PERIOD_MS - 500)
/**
* 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);
/* Reload the watchdog counter */
#ifdef CONFIG_WATCHDOG
void watchdog_reload(void);
#else
static inline void watchdog_reload(void) { }
#endif
#endif /* __CROS_EC_WATCHDOG_H */
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