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243 lines
5.8 KiB
243 lines
5.8 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Watchdog driver for Broadcom BCM47XX |
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* |
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* Copyright (C) 2008 Aleksandar Radovanovic <[email protected]> |
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* Copyright (C) 2009 Matthieu CASTET <[email protected]> |
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* Copyright (C) 2012-2013 Hauke Mehrtens <[email protected]> |
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* |
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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/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 int bcm47xx_wdt_restart(struct watchdog_device *wdd, |
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unsigned long action, void *data) |
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{ |
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struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
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wdt->timer_set(wdt, 1); |
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return 0; |
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} |
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static const 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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.restart = bcm47xx_wdt_restart, |
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}; |
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static void bcm47xx_wdt_soft_timer_tick(struct timer_list *t) |
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{ |
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struct bcm47xx_wdt *wdt = from_timer(wdt, t, soft_timer); |
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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(&wdt->soft_timer); |
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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 const 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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.restart = bcm47xx_wdt_restart, |
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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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timer_setup(&wdt->soft_timer, bcm47xx_wdt_soft_timer_tick, 0); |
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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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watchdog_set_restart_priority(&wdt->wdd, 64); |
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watchdog_stop_on_reboot(&wdt->wdd); |
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ret = watchdog_register_device(&wdt->wdd); |
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if (ret) |
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goto err_timer; |
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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_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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watchdog_unregister_device(&wdt->wdd); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx"); |
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MODULE_LICENSE("GPL");
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