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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Edge TPU software WDT interface.
*
* Copyright (C) 2020 Google, Inc.
*/
#ifndef __EDGETPU_SW_WDT_H__
#define __EDGETPU_SW_WDT_H__
#include <linux/workqueue.h>
#include "edgetpu-internal.h"
#define EDGETPU_ACTIVE_DEV_BEAT_MS 15000 /* 15 seconds */
#define EDGETPU_DORMANT_DEV_BEAT_MS 60000 /* 60 seconds */
struct edgetpu_sw_wdt_action_work {
struct work_struct work;
/* pending function to be called on watchdog bite. */
void (*edgetpu_sw_wdt_handler)(void *data);
/* optional data can be used by callback function. */
void *data;
};
struct edgetpu_sw_wdt {
struct delayed_work dwork;
/* edgetpu device this watchdog is monitoring. */
struct edgetpu_dev *etdev;
/* time period in jiffies in pinging device firmware. */
unsigned long hrtbeat_jiffs;
/* work information for watchdog bite. */
struct edgetpu_sw_wdt_action_work et_action_work;
/* flag to mark that watchdog is disabled. */
bool is_wdt_disabled;
};
int edgetpu_sw_wdt_create(struct edgetpu_dev *etdev, unsigned long hrtbeat_ms);
int edgetpu_sw_wdt_start(struct edgetpu_dev *etdev);
void edgetpu_sw_wdt_stop(struct edgetpu_dev *etdev);
void edgetpu_sw_wdt_destroy(struct edgetpu_dev *etdev);
/*
* Set callback function @handler_cb and optional param @data which is to be
* called on f/w ping timeout.
*/
void edgetpu_sw_wdt_set_handler(struct edgetpu_dev *etdev,
void (*handler_cb)(void *), void *data);
/* Modify the time interval of heartbeat. It will also start the watchdog. */
void edgetpu_sw_wdt_modify_heartbeat(struct edgetpu_dev *etdev,
unsigned long hrtbeat_ms);
/*
* Schedule sw watchdog action immediately. Called on fatal errors.
* @reset: true if error recovery requires a full chip reset, not just
* firmware restart.
*/
void edgetpu_watchdog_bite(struct edgetpu_dev *etdev, bool reset);
#endif /* __EDGETPU_SW_WDT_H__ */
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