156 lines
3.9 KiB
C
156 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28
|
|
*
|
|
* Author: Wolfram Sang <kernel@pengutronix.de>
|
|
*
|
|
* Copyright (C) 2011-12 Wolfram Sang, Pengutronix
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/stmp3xxx_rtc_wdt.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/reboot.h>
|
|
|
|
#define WDOG_TICK_RATE 1000 /* 1 kHz clock */
|
|
#define STMP3XXX_DEFAULT_TIMEOUT 19
|
|
#define STMP3XXX_MAX_TIMEOUT (UINT_MAX / WDOG_TICK_RATE)
|
|
|
|
static int heartbeat = STMP3XXX_DEFAULT_TIMEOUT;
|
|
module_param(heartbeat, uint, 0);
|
|
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat period in seconds from 1 to "
|
|
__MODULE_STRING(STMP3XXX_MAX_TIMEOUT) ", default "
|
|
__MODULE_STRING(STMP3XXX_DEFAULT_TIMEOUT));
|
|
|
|
static int wdt_start(struct watchdog_device *wdd)
|
|
{
|
|
struct device *dev = watchdog_get_drvdata(wdd);
|
|
struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
|
|
|
|
pdata->wdt_set_timeout(dev->parent, wdd->timeout * WDOG_TICK_RATE);
|
|
return 0;
|
|
}
|
|
|
|
static int wdt_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct device *dev = watchdog_get_drvdata(wdd);
|
|
struct stmp3xxx_wdt_pdata *pdata = dev_get_platdata(dev);
|
|
|
|
pdata->wdt_set_timeout(dev->parent, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int wdt_set_timeout(struct watchdog_device *wdd, unsigned new_timeout)
|
|
{
|
|
wdd->timeout = new_timeout;
|
|
return wdt_start(wdd);
|
|
}
|
|
|
|
static const struct watchdog_info stmp3xxx_wdt_ident = {
|
|
.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
|
.identity = "STMP3XXX RTC Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops stmp3xxx_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = wdt_start,
|
|
.stop = wdt_stop,
|
|
.set_timeout = wdt_set_timeout,
|
|
};
|
|
|
|
static struct watchdog_device stmp3xxx_wdd = {
|
|
.info = &stmp3xxx_wdt_ident,
|
|
.ops = &stmp3xxx_wdt_ops,
|
|
.min_timeout = 1,
|
|
.max_timeout = STMP3XXX_MAX_TIMEOUT,
|
|
.status = WATCHDOG_NOWAYOUT_INIT_STATUS,
|
|
};
|
|
|
|
static int wdt_notify_sys(struct notifier_block *nb, unsigned long code,
|
|
void *unused)
|
|
{
|
|
switch (code) {
|
|
case SYS_DOWN: /* keep enabled, system might crash while going down */
|
|
break;
|
|
case SYS_HALT: /* allow the system to actually halt */
|
|
case SYS_POWER_OFF:
|
|
wdt_stop(&stmp3xxx_wdd);
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block wdt_notifier = {
|
|
.notifier_call = wdt_notify_sys,
|
|
};
|
|
|
|
static int stmp3xxx_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
|
|
watchdog_set_drvdata(&stmp3xxx_wdd, &pdev->dev);
|
|
|
|
stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT);
|
|
stmp3xxx_wdd.parent = &pdev->dev;
|
|
|
|
ret = watchdog_register_device(&stmp3xxx_wdd);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "cannot register watchdog device\n");
|
|
return ret;
|
|
}
|
|
|
|
if (register_reboot_notifier(&wdt_notifier))
|
|
dev_warn(&pdev->dev, "cannot register reboot notifier\n");
|
|
|
|
dev_info(&pdev->dev, "initialized watchdog with heartbeat %ds\n",
|
|
stmp3xxx_wdd.timeout);
|
|
return 0;
|
|
}
|
|
|
|
static int stmp3xxx_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
watchdog_unregister_device(&stmp3xxx_wdd);
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stmp3xxx_wdt_suspend(struct device *dev)
|
|
{
|
|
struct watchdog_device *wdd = &stmp3xxx_wdd;
|
|
|
|
if (watchdog_active(wdd))
|
|
return wdt_stop(wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __maybe_unused stmp3xxx_wdt_resume(struct device *dev)
|
|
{
|
|
struct watchdog_device *wdd = &stmp3xxx_wdd;
|
|
|
|
if (watchdog_active(wdd))
|
|
return wdt_start(wdd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(stmp3xxx_wdt_pm_ops,
|
|
stmp3xxx_wdt_suspend, stmp3xxx_wdt_resume);
|
|
|
|
static struct platform_driver stmp3xxx_wdt_driver = {
|
|
.driver = {
|
|
.name = "stmp3xxx_rtc_wdt",
|
|
.pm = &stmp3xxx_wdt_pm_ops,
|
|
},
|
|
.probe = stmp3xxx_wdt_probe,
|
|
.remove = stmp3xxx_wdt_remove,
|
|
};
|
|
module_platform_driver(stmp3xxx_wdt_driver);
|
|
|
|
MODULE_DESCRIPTION("STMP3XXX RTC Watchdog Driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Wolfram Sang <kernel@pengutronix.de>");
|