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watchdog: bcm47xx_wdt.c: use platform device
Instead of accessing the function to set the watchdog timer directly, register a platform driver the platform could register to use this watchdog driver. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Hauke Mehrtens
Wim Van Sebroeck
parent
5434a04db9
commit
f82dedf812
@ -3,6 +3,7 @@
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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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@ -12,19 +13,19 @@
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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/init.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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#include <linux/ssb/ssb_embedded.h>
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#include <asm/mach-bcm47xx/bcm47xx.h>
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#define DRV_NAME "bcm47xx_wdt"
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@ -43,48 +44,19 @@ 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 struct timer_list wdt_timer;
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static atomic_t ticks;
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static inline void bcm47xx_wdt_hw_start(void)
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static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
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{
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/* this is 2,5s on 100Mhz clock and 2s on 133 Mhz */
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switch (bcm47xx_bus_type) {
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#ifdef CONFIG_BCM47XX_SSB
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case BCM47XX_BUS_TYPE_SSB:
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ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0xfffffff);
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break;
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#endif
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#ifdef CONFIG_BCM47XX_BCMA
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case BCM47XX_BUS_TYPE_BCMA:
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bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc,
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0xfffffff);
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break;
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#endif
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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 inline int bcm47xx_wdt_hw_stop(void)
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static void bcm47xx_timer_tick(unsigned long data)
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{
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switch (bcm47xx_bus_type) {
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#ifdef CONFIG_BCM47XX_SSB
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case BCM47XX_BUS_TYPE_SSB:
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return ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0);
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#endif
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#ifdef CONFIG_BCM47XX_BCMA
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case BCM47XX_BUS_TYPE_BCMA:
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bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc, 0);
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return 0;
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#endif
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}
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return -EINVAL;
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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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static void bcm47xx_timer_tick(unsigned long unused)
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{
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if (!atomic_dec_and_test(&ticks)) {
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bcm47xx_wdt_hw_start();
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mod_timer(&wdt_timer, jiffies + HZ);
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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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@ -92,23 +64,29 @@ static void bcm47xx_timer_tick(unsigned long unused)
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static int bcm47xx_wdt_keepalive(struct watchdog_device *wdd)
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{
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atomic_set(&ticks, wdt_time);
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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_start(struct watchdog_device *wdd)
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{
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bcm47xx_wdt_pet();
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bcm47xx_timer_tick(0);
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struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
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bcm47xx_wdt_keepalive(wdd);
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bcm47xx_timer_tick((unsigned long)wdt);
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return 0;
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}
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static int bcm47xx_wdt_stop(struct watchdog_device *wdd)
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{
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del_timer_sync(&wdt_timer);
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bcm47xx_wdt_hw_stop();
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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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@ -116,10 +94,13 @@ static int bcm47xx_wdt_stop(struct watchdog_device *wdd)
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static int bcm47xx_wdt_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 <= 0) || (new_time > WDT_MAX_TIME))
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if (new_time < 1 || new_time > WDT_MAX_TIME) {
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pr_warn("timeout value must be 1<=x<=%d, using %d\n",
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WDT_MAX_TIME, new_time);
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return -EINVAL;
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}
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wdt_time = new_time;
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wdd->timeout = new_time;
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return 0;
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}
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@ -133,8 +114,11 @@ static const struct watchdog_info bcm47xx_wdt_info = {
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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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bcm47xx_wdt_stop();
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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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@ -146,56 +130,72 @@ static struct watchdog_ops bcm47xx_wdt_ops = {
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.set_timeout = bcm47xx_wdt_set_timeout,
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};
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static struct watchdog_device bcm47xx_wdt_wdd = {
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.info = &bcm47xx_wdt_info,
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.ops = &bcm47xx_wdt_ops,
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};
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static struct notifier_block bcm47xx_wdt_notifier = {
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.notifier_call = bcm47xx_wdt_notify_sys,
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};
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static int __init bcm47xx_wdt_init(void)
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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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struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
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if (bcm47xx_wdt_hw_stop() < 0)
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return -ENODEV;
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if (!wdt)
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return -ENXIO;
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setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
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setup_timer(&wdt->soft_timer, bcm47xx_timer_tick,
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(long unsigned int)wdt);
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if (bcm47xx_wdt_settimeout(wdt_time)) {
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bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);
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pr_info("wdt_time value must be 0 < wdt_time < %d, using %d\n",
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(WDT_MAX_TIME + 1), wdt_time);
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}
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watchdog_set_nowayout(&bcm47xx_wdt_wdd, nowayout);
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ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
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wdt->wdd.ops = &bcm47xx_wdt_ops;
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wdt->wdd.info = &bcm47xx_wdt_info;
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wdt->wdd.timeout = WDT_DEFAULT_TIME;
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ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
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if (ret)
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return ret;
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goto err_timer;
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watchdog_set_nowayout(&wdt->wdd, nowayout);
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ret = watchdog_register_device(&bcm47xx_wdt_wdd);
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if (ret) {
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unregister_reboot_notifier(&bcm47xx_wdt_notifier);
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return ret;
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}
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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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ret = watchdog_register_device(&wdt->wdd);
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if (ret)
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goto err_notifier;
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pr_info("BCM47xx Watchdog Timer enabled (%d seconds%s)\n",
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wdt_time, nowayout ? ", nowayout" : "");
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return 0;
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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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del_timer_sync(&wdt->soft_timer);
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return ret;
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}
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static void __exit bcm47xx_wdt_exit(void)
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static int bcm47xx_wdt_remove(struct platform_device *pdev)
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{
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watchdog_unregister_device(&bcm47xx_wdt_wdd);
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struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
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unregister_reboot_notifier(&bcm47xx_wdt_notifier);
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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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module_init(bcm47xx_wdt_init);
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module_exit(bcm47xx_wdt_exit);
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static struct platform_driver bcm47xx_wdt_driver = {
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.driver = {
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.owner = THIS_MODULE,
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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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@ -1,7 +1,10 @@
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#ifndef LINUX_BCM47XX_WDT_H_
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#define LINUX_BCM47XX_WDT_H_
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#include <linux/notifier.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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struct bcm47xx_wdt {
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@ -10,6 +13,12 @@ struct bcm47xx_wdt {
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u32 max_timer_ms;
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void *driver_data;
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struct watchdog_device wdd;
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struct notifier_block notifier;
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struct timer_list soft_timer;
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atomic_t soft_ticks;
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};
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static inline void *bcm47xx_wdt_get_drvdata(struct bcm47xx_wdt *wdt)
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