mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
153 lines
3.8 KiB
153 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* Watchdog driver for the RTC based watchdog in STMP3xxx and i.MX23/28 |
|
* |
|
* Author: Wolfram Sang <[email protected]> |
|
* |
|
* 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) |
|
{ |
|
struct device *dev = &pdev->dev; |
|
int ret; |
|
|
|
watchdog_set_drvdata(&stmp3xxx_wdd, dev); |
|
|
|
stmp3xxx_wdd.timeout = clamp_t(unsigned, heartbeat, 1, STMP3XXX_MAX_TIMEOUT); |
|
stmp3xxx_wdd.parent = dev; |
|
|
|
ret = devm_watchdog_register_device(dev, &stmp3xxx_wdd); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if (register_reboot_notifier(&wdt_notifier)) |
|
dev_warn(dev, "cannot register reboot notifier\n"); |
|
|
|
dev_info(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); |
|
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 <[email protected]>");
|
|
|