*
* 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
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/bcm47xx_wdt.h>
#include <linux/bitops.h>
#include <linux/errno.h>
-#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
-#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/types.h>
-#include <linux/uaccess.h>
#include <linux/watchdog.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
-#include <linux/ssb/ssb_embedded.h>
-#include <asm/mach-bcm47xx/bcm47xx.h>
#define DRV_NAME "bcm47xx_wdt"
#define WDT_DEFAULT_TIME 30 /* seconds */
-#define WDT_MAX_TIME 255 /* seconds */
+#define WDT_SOFTTIMER_MAX 255 /* seconds */
+#define WDT_SOFTTIMER_THRESHOLD 60 /* seconds */
-static int wdt_time = WDT_DEFAULT_TIME;
+static int timeout = 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_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog time in seconds. (default="
__MODULE_STRING(WDT_DEFAULT_TIME) ")");
-#ifdef CONFIG_WATCHDOG_NOWAYOUT
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-#endif
-static unsigned long bcm47xx_wdt_busy;
-static char expect_release;
-static struct timer_list wdt_timer;
-static atomic_t ticks;
-
-static inline void bcm47xx_wdt_hw_start(void)
+static inline struct bcm47xx_wdt *bcm47xx_wdt_get(struct watchdog_device *wdd)
{
- /* this is 2,5s on 100Mhz clock and 2s on 133 Mhz */
- switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
- case BCM47XX_BUS_TYPE_SSB:
- ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0xfffffff);
- break;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
- case BCM47XX_BUS_TYPE_BCMA:
- bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc,
- 0xfffffff);
- break;
-#endif
- }
+ return container_of(wdd, struct bcm47xx_wdt, wdd);
}
-static inline int bcm47xx_wdt_hw_stop(void)
+static int bcm47xx_wdt_hard_keepalive(struct watchdog_device *wdd)
{
- switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
- case BCM47XX_BUS_TYPE_SSB:
- return ssb_watchdog_timer_set(&bcm47xx_bus.ssb, 0);
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
- case BCM47XX_BUS_TYPE_BCMA:
- bcma_chipco_watchdog_timer_set(&bcm47xx_bus.bcma.bus.drv_cc, 0);
- return 0;
-#endif
- }
- return -EINVAL;
-}
+ struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
-static void bcm47xx_timer_tick(unsigned long unused)
-{
- if (!atomic_dec_and_test(&ticks)) {
- bcm47xx_wdt_hw_start();
- mod_timer(&wdt_timer, jiffies + HZ);
- } else {
- pr_crit("Watchdog will fire soon!!!\n");
- }
+ wdt->timer_set_ms(wdt, wdd->timeout * 1000);
+
+ return 0;
}
-static inline void bcm47xx_wdt_pet(void)
+static int bcm47xx_wdt_hard_start(struct watchdog_device *wdd)
{
- atomic_set(&ticks, wdt_time);
+ return 0;
}
-static void bcm47xx_wdt_start(void)
+static int bcm47xx_wdt_hard_stop(struct watchdog_device *wdd)
{
- bcm47xx_wdt_pet();
- bcm47xx_timer_tick(0);
+ struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+ wdt->timer_set(wdt, 0);
+
+ return 0;
}
-static void bcm47xx_wdt_pause(void)
+static int bcm47xx_wdt_hard_set_timeout(struct watchdog_device *wdd,
+ unsigned int new_time)
{
- del_timer_sync(&wdt_timer);
- bcm47xx_wdt_hw_stop();
+ 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 void bcm47xx_wdt_stop(void)
+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)
{
- bcm47xx_wdt_pause();
+ 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_settimeout(int new_time)
+static int bcm47xx_wdt_soft_keepalive(struct watchdog_device *wdd)
{
- if ((new_time <= 0) || (new_time > WDT_MAX_TIME))
- return -EINVAL;
+ struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+ atomic_set(&wdt->soft_ticks, wdd->timeout);
- wdt_time = new_time;
return 0;
}
-static int bcm47xx_wdt_open(struct inode *inode, struct file *file)
+static int bcm47xx_wdt_soft_start(struct watchdog_device *wdd)
{
- if (test_and_set_bit(0, &bcm47xx_wdt_busy))
- return -EBUSY;
+ struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+ bcm47xx_wdt_soft_keepalive(wdd);
+ bcm47xx_wdt_soft_timer_tick((unsigned long)wdt);
- bcm47xx_wdt_start();
- return nonseekable_open(inode, file);
+ return 0;
}
-static int bcm47xx_wdt_release(struct inode *inode, struct file *file)
+static int bcm47xx_wdt_soft_stop(struct watchdog_device *wdd)
{
- if (expect_release == 42) {
- bcm47xx_wdt_stop();
- } else {
- pr_crit("Unexpected close, not stopping watchdog!\n");
- bcm47xx_wdt_start();
- }
+ struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+ del_timer_sync(&wdt->soft_timer);
+ wdt->timer_set(wdt, 0);
- clear_bit(0, &bcm47xx_wdt_busy);
- expect_release = 0;
return 0;
}
-static ssize_t bcm47xx_wdt_write(struct file *file, const char __user *data,
- size_t len, loff_t *ppos)
+static int bcm47xx_wdt_soft_set_timeout(struct watchdog_device *wdd,
+ unsigned int new_time)
{
- if (len) {
- if (!nowayout) {
- size_t i;
-
- expect_release = 0;
-
- for (i = 0; i != len; i++) {
- char c;
- if (get_user(c, data + i))
- return -EFAULT;
- if (c == 'V')
- expect_release = 42;
- }
- }
- bcm47xx_wdt_pet();
+ 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;
}
- return len;
+
+ wdd->timeout = new_time;
+ return 0;
}
static const struct watchdog_info bcm47xx_wdt_info = {
WDIOF_MAGICCLOSE,
};
-static long bcm47xx_wdt_ioctl(struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- void __user *argp = (void __user *)arg;
- int __user *p = argp;
- int new_value, retval = -EINVAL;
-
- switch (cmd) {
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &bcm47xx_wdt_info,
- sizeof(bcm47xx_wdt_info)) ? -EFAULT : 0;
-
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
-
- case WDIOC_SETOPTIONS:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (new_value & WDIOS_DISABLECARD) {
- bcm47xx_wdt_stop();
- retval = 0;
- }
-
- if (new_value & WDIOS_ENABLECARD) {
- bcm47xx_wdt_start();
- retval = 0;
- }
-
- return retval;
-
- case WDIOC_KEEPALIVE:
- bcm47xx_wdt_pet();
- return 0;
-
- case WDIOC_SETTIMEOUT:
- if (get_user(new_value, p))
- return -EFAULT;
-
- if (bcm47xx_wdt_settimeout(new_value))
- return -EINVAL;
-
- bcm47xx_wdt_pet();
-
- case WDIOC_GETTIMEOUT:
- return put_user(wdt_time, p);
-
- default:
- return -ENOTTY;
- }
-}
-
static int bcm47xx_wdt_notify_sys(struct notifier_block *this,
- unsigned long code, void *unused)
+ unsigned long code, void *unused)
{
+ struct bcm47xx_wdt *wdt;
+
+ wdt = container_of(this, struct bcm47xx_wdt, notifier);
if (code == SYS_DOWN || code == SYS_HALT)
- bcm47xx_wdt_stop();
+ wdt->wdd.ops->stop(&wdt->wdd);
return NOTIFY_DONE;
}
-static const struct file_operations bcm47xx_wdt_fops = {
+static struct watchdog_ops bcm47xx_wdt_soft_ops = {
.owner = THIS_MODULE,
- .llseek = no_llseek,
- .unlocked_ioctl = bcm47xx_wdt_ioctl,
- .open = bcm47xx_wdt_open,
- .release = bcm47xx_wdt_release,
- .write = bcm47xx_wdt_write,
-};
-
-static struct miscdevice bcm47xx_wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &bcm47xx_wdt_fops,
-};
-
-static struct notifier_block bcm47xx_wdt_notifier = {
- .notifier_call = bcm47xx_wdt_notify_sys,
+ .start = bcm47xx_wdt_soft_start,
+ .stop = bcm47xx_wdt_soft_stop,
+ .ping = bcm47xx_wdt_soft_keepalive,
+ .set_timeout = bcm47xx_wdt_soft_set_timeout,
};
-static int __init bcm47xx_wdt_init(void)
+static int bcm47xx_wdt_probe(struct platform_device *pdev)
{
int ret;
+ bool soft;
+ struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
- if (bcm47xx_wdt_hw_stop() < 0)
- return -ENODEV;
+ if (!wdt)
+ return -ENXIO;
- setup_timer(&wdt_timer, bcm47xx_timer_tick, 0L);
+ soft = wdt->max_timer_ms < WDT_SOFTTIMER_THRESHOLD * 1000;
- if (bcm47xx_wdt_settimeout(wdt_time)) {
- bcm47xx_wdt_settimeout(WDT_DEFAULT_TIME);
- pr_info("wdt_time value must be 0 < wdt_time < %d, using %d\n",
- (WDT_MAX_TIME + 1), wdt_time);
+ 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;
}
- ret = register_reboot_notifier(&bcm47xx_wdt_notifier);
+ wdt->wdd.info = &bcm47xx_wdt_info;
+ wdt->wdd.timeout = WDT_DEFAULT_TIME;
+ ret = wdt->wdd.ops->set_timeout(&wdt->wdd, timeout);
if (ret)
- return ret;
+ goto err_timer;
+ watchdog_set_nowayout(&wdt->wdd, nowayout);
- ret = misc_register(&bcm47xx_wdt_miscdev);
- if (ret) {
- unregister_reboot_notifier(&bcm47xx_wdt_notifier);
- return ret;
- }
+ wdt->notifier.notifier_call = &bcm47xx_wdt_notify_sys;
+
+ ret = register_reboot_notifier(&wdt->notifier);
+ if (ret)
+ goto err_timer;
- pr_info("BCM47xx Watchdog Timer enabled (%d seconds%s)\n",
- wdt_time, nowayout ? ", nowayout" : "");
+ ret = watchdog_register_device(&wdt->wdd);
+ if (ret)
+ goto err_notifier;
+
+ dev_info(&pdev->dev, "BCM47xx Watchdog Timer enabled (%d seconds%s%s)\n",
+ timeout, nowayout ? ", nowayout" : "",
+ soft ? ", Software Timer" : "");
return 0;
+
+err_notifier:
+ unregister_reboot_notifier(&wdt->notifier);
+err_timer:
+ if (soft)
+ del_timer_sync(&wdt->soft_timer);
+
+ return ret;
}
-static void __exit bcm47xx_wdt_exit(void)
+static int bcm47xx_wdt_remove(struct platform_device *pdev)
{
- if (!nowayout)
- bcm47xx_wdt_stop();
+ struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
- misc_deregister(&bcm47xx_wdt_miscdev);
+ if (!wdt)
+ return -ENXIO;
- unregister_reboot_notifier(&bcm47xx_wdt_notifier);
+ watchdog_unregister_device(&wdt->wdd);
+ unregister_reboot_notifier(&wdt->notifier);
+
+ return 0;
}
-module_init(bcm47xx_wdt_init);
-module_exit(bcm47xx_wdt_exit);
+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");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
projects / karo-tx-linux.git / blobdiff