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