276 строки
6.6 KiB
C
276 строки
6.6 KiB
C
/*
|
|
* Watchdog driver for Broadcom BCM47XX
|
|
*
|
|
* Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@sezampro.rs>
|
|
* Copyright (C) 2009 Matthieu CASTET <castet.matthieu@free.fr>
|
|
* Copyright (C) 2012-2013 Hauke Mehrtens <hauke@hauke-m.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/bcm47xx_wdt.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/jiffies.h>
|
|
|
|
#define DRV_NAME "bcm47xx_wdt"
|
|
|
|
#define WDT_DEFAULT_TIME 30 /* seconds */
|
|
#define WDT_SOFTTIMER_MAX 255 /* seconds */
|
|
#define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */
|
|
|
|
static int timeout = WDT_DEFAULT_TIME;
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
|
|
module_param(timeout, int, 0);
|
|
MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default="
|
|
__MODULE_STRING(WDT_DEFAULT_TIME) ")");
|
|
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
|
|
{
|
|
return container_of(wdd, struct bcm47xx_wdt, wdd);
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
wdt->timer_set_ms(wdt, wdd->timeout * 1000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
wdt->timer_set(wdt, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
|
|
unsigned int new_time)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
u32 max_timer = wdt->max_timer_ms;
|
|
|
|
if (new_time < 1 || new_time > max_timer / 1000) {
|
|
pr_warn("timeout value must be 1<=x<=%d, using %d\n",
|
|
max_timer / 1000, new_time);
|
|
return -EINVAL;
|
|
}
|
|
|
|
wdd->timeout = new_time;
|
|
return 0;
|
|
}
|
|
|
|
static struct watchdog_ops bcm47xx_wdt_hard_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = bcm47xx_wdt_hard_start,
|
|
.stop = bcm47xx_wdt_hard_stop,
|
|
.ping = bcm47xx_wdt_hard_keepalive,
|
|
.set_timeout = bcm47xx_wdt_hard_set_timeout,
|
|
};
|
|
|
|
static void bcm47xx_wdt_soft_timer_tick(unsigned long data)
|
|
{
|
|
struct bcm47xx_wdt *wdt = (struct bcm47xx_wdt *)data;
|
|
u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
|
|
|
|
if (!atomic_dec_and_test(&wdt->soft_ticks)) {
|
|
wdt->timer_set_ms(wdt, next_tick);
|
|
mod_timer(&wdt->soft_timer, jiffies + HZ);
|
|
} else {
|
|
pr_crit("Watchdog will fire soon!!!\n");
|
|
}
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
atomic_set(&wdt->soft_ticks, wdd->timeout);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
bcm47xx_wdt_soft_keepalive(wdd);
|
|
bcm47xx_wdt_soft_timer_tick((unsigned long)wdt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
|
|
{
|
|
struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
|
|
|
|
del_timer_sync(&wdt->soft_timer);
|
|
wdt->timer_set(wdt, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
|
|
unsigned int new_time)
|
|
{
|
|
if (new_time < 1 || new_time > WDT_SOFTTIMER_MAX) {
|
|
pr_warn("timeout value must be 1<=x<=%d, using %d\n",
|
|
WDT_SOFTTIMER_MAX, new_time);
|
|
return -EINVAL;
|
|
}
|
|
|
|
wdd->timeout = new_time;
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_info bcm47xx_wdt_info = {
|
|
.identity = DRV_NAME,
|
|
.options = WDIOF_SETTIMEOUT |
|
|
WDIOF_KEEPALIVEPING |
|
|
WDIOF_MAGICCLOSE,
|
|
};
|
|
|
|
static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
|
|
unsigned long code, void *unused)
|
|
{
|
|
struct bcm47xx_wdt *wdt;
|
|
|
|
wdt = container_of(this, struct bcm47xx_wdt, notifier);
|
|
if (code == SYS_DOWN || code == SYS_HALT)
|
|
wdt->wdd.ops->stop(&wdt->wdd);
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int bcm47xx_wdt_restart(struct notifier_block *this, unsigned long mode,
|
|
void *cmd)
|
|
{
|
|
struct bcm47xx_wdt *wdt;
|
|
|
|
wdt = container_of(this, struct bcm47xx_wdt, restart_handler);
|
|
wdt->timer_set(wdt, 1);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct watchdog_ops bcm47xx_wdt_soft_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = bcm47xx_wdt_soft_start,
|
|
.stop = bcm47xx_wdt_soft_stop,
|
|
.ping = bcm47xx_wdt_soft_keepalive,
|
|
.set_timeout = bcm47xx_wdt_soft_set_timeout,
|
|
};
|
|
|
|
static int bcm47xx_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
bool soft;
|
|
struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
|
|
|
|
if (!wdt)
|
|
return -ENXIO;
|
|
|
|
soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
|
|
|
|
if (soft) {
|
|
wdt->wdd.ops = &bcm47xx_wdt_soft_ops;
|
|
setup_timer(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick,
|
|
(long unsigned int)wdt);
|
|
} else {
|
|
wdt->wdd.ops = &bcm47xx_wdt_hard_ops;
|
|
}
|
|
|
|
wdt->wdd.info = &bcm47xx_wdt_info;
|
|
wdt->wdd.timeout = WDT_DEFAULT_TIME;
|
|
ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
|
|
if (ret)
|
|
goto err_timer;
|
|
watchdog_set_nowayout(&wdt->wdd, nowayout);
|
|
|
|
wdt->notifier.notifier_call = &bcm47xx_wdt_notify_sys;
|
|
|
|
ret = register_reboot_notifier(&wdt->notifier);
|
|
if (ret)
|
|
goto err_timer;
|
|
|
|
wdt->restart_handler.notifier_call = &bcm47xx_wdt_restart;
|
|
wdt->restart_handler.priority = 64;
|
|
ret = register_restart_handler(&wdt->restart_handler);
|
|
if (ret)
|
|
goto err_notifier;
|
|
|
|
ret = watchdog_register_device(&wdt->wdd);
|
|
if (ret)
|
|
goto err_handler;
|
|
|
|
dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
|
|
timeout, nowayout ? ", nowayout" : "",
|
|
soft ? ", Software Timer" : "");
|
|
return 0;
|
|
|
|
err_handler:
|
|
unregister_restart_handler(&wdt->restart_handler);
|
|
err_notifier:
|
|
unregister_reboot_notifier(&wdt->notifier);
|
|
err_timer:
|
|
if (soft)
|
|
del_timer_sync(&wdt->soft_timer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bcm47xx_wdt_remove(struct platform_device *pdev)
|
|
{
|
|
struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
|
|
|
|
if (!wdt)
|
|
return -ENXIO;
|
|
|
|
watchdog_unregister_device(&wdt->wdd);
|
|
unregister_reboot_notifier(&wdt->notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver bcm47xx_wdt_driver = {
|
|
.driver = {
|
|
.name = "bcm47xx-wdt",
|
|
},
|
|
.probe = bcm47xx_wdt_probe,
|
|
.remove = bcm47xx_wdt_remove,
|
|
};
|
|
|
|
module_platform_driver(bcm47xx_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Aleksandar Radovanovic");
|
|
MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
|
|
MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
|
|
MODULE_LICENSE("GPL");
|