| /* |
| * 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/init.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_MAX_TIME 255 /* seconds */ |
| |
| static int wdt_time = WDT_DEFAULT_TIME; |
| static bool nowayout = WATCHDOG_NOWAYOUT; |
| |
| module_param(wdt_time, int, 0); |
| MODULE_PARM_DESC(wdt_time, "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 void bcm47xx_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_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_start(struct watchdog_device *wdd) |
| { |
| struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd); |
| |
| bcm47xx_wdt_keepalive(wdd); |
| bcm47xx_timer_tick((unsigned long)wdt); |
| |
| return 0; |
| } |
| |
| static int bcm47xx_wdt_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_set_timeout(struct watchdog_device *wdd, |
| unsigned int new_time) |
| { |
| if (new_time < 1 || new_time > WDT_MAX_TIME) { |
| pr_warn("timeout value must be 1<=x<=%d, using %d\n", |
| WDT_MAX_TIME, 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 struct watchdog_ops bcm47xx_wdt_ops = { |
| .owner = THIS_MODULE, |
| .start = bcm47xx_wdt_start, |
| .stop = bcm47xx_wdt_stop, |
| .ping = bcm47xx_wdt_keepalive, |
| .set_timeout = bcm47xx_wdt_set_timeout, |
| }; |
| |
| static int bcm47xx_wdt_probe(struct platform_device *pdev) |
| { |
| int ret; |
| struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev); |
| |
| if (!wdt) |
| return -ENXIO; |
| |
| setup_timer(&wdt->soft_timer, bcm47xx_timer_tick, |
| (long unsigned int)wdt); |
| |
| wdt->wdd.ops = &bcm47xx_wdt_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; |
| |
| ret = watchdog_register_device(&wdt->wdd); |
| if (ret) |
| goto err_notifier; |
| |
| pr_info("BCM47xx Watchdog Timer enabled (%d seconds%s)\n", |
| wdt_time, nowayout ? ", nowayout" : ""); |
| return 0; |
| |
| err_notifier: |
| unregister_reboot_notifier(&wdt->notifier); |
| err_timer: |
| 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 = { |
| .owner = THIS_MODULE, |
| .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"); |