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@xxxxxxxxxx>
---
drivers/watchdog/bcm47xx_wdt.c | 156 ++++++++++++++++++++--------------------
include/linux/bcm47xx_wdt.h | 27 +++++++
2 files changed, 105 insertions(+), 78 deletions(-)
create mode 100644 include/linux/bcm47xx_wdt.h
diff --git a/drivers/watchdog/bcm47xx_wdt.c b/drivers/watchdog/bcm47xx_wdt.c
index 4c520d6..cf1191b 100644
--- a/drivers/watchdog/bcm47xx_wdt.c
+++ b/drivers/watchdog/bcm47xx_wdt.c
@@ -3,6 +3,7 @@
*
* Copyright (C) 2008 Aleksandar Radovanovic <biblbroks@xxxxxxxxxxx>
* Copyright (C) 2009 Matthieu CASTET <castet.matthieu@xxxxxxx>
+ * Copyright (C) 2012 Hauke Mehrtens <hauke@xxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -12,19 +13,19 @@
#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>
-#include <linux/ssb/ssb_embedded.h>
-#include <asm/mach-bcm47xx/bcm47xx.h>
#define DRV_NAME "bcm47xx_wdt"
@@ -43,48 +44,19 @@ MODULE_PARM_DESC(nowayout,
"Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
-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 void bcm47xx_timer_tick(unsigned long data)
{
- 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 = (struct bcm47xx_wdt *)data;
+ u32 next_tick = min(wdt->wdd.timeout * 1000, wdt->max_timer_ms);
-static void bcm47xx_timer_tick(unsigned long unused)
-{
- if (!atomic_dec_and_test(&ticks)) {
- bcm47xx_wdt_hw_start();
- mod_timer(&wdt_timer, jiffies + HZ);
+ 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");
}
@@ -92,23 +64,29 @@ static void bcm47xx_timer_tick(unsigned long unused)
static int bcm47xx_wdt_keepalive(struct watchdog_device *wdd)
{
- atomic_set(&ticks, wdt_time);
+ 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)
{
- bcm47xx_wdt_pet();
- bcm47xx_timer_tick(0);
+ 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)
{
- del_timer_sync(&wdt_timer);
- bcm47xx_wdt_hw_stop();
+ struct bcm47xx_wdt *wdt = bcm47xx_wdt_get(wdd);
+
+ del_timer_sync(&wdt->soft_timer);
+ wdt->timer_set(wdt, 0);
return 0;
}
@@ -116,10 +94,13 @@ static int bcm47xx_wdt_stop(struct watchdog_device *wdd)
static int bcm47xx_wdt_set_timeout(struct watchdog_device *wdd,
unsigned int new_time)
{
- if ((new_time <= 0) || (new_time > WDT_MAX_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;
+ }
- wdt_time = new_time;
+ wdd->timeout = new_time;
return 0;
}
@@ -133,8 +114,11 @@ static const struct watchdog_info bcm47xx_wdt_info = {
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)
- bcm47xx_wdt_stop();
+ wdt->wdd.ops->stop(&wdt->wdd);
return NOTIFY_DONE;
}
@@ -146,56 +130,72 @@ static struct watchdog_ops bcm47xx_wdt_ops = {
.set_timeout = bcm47xx_wdt_set_timeout,
};
-static struct watchdog_device bcm47xx_wdt_wdd = {
- .info = &bcm47xx_wdt_info,
- .ops = &bcm47xx_wdt_ops,
-};
-
-static struct notifier_block bcm47xx_wdt_notifier = {
- .notifier_call = bcm47xx_wdt_notify_sys,
-};
-
-static int __init bcm47xx_wdt_init(void)
+static int __devinit bcm47xx_wdt_probe(struct platform_device *pdev)
{
int ret;
+ 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);
+ setup_timer(&wdt->soft_timer, bcm47xx_timer_tick,
+ (long unsigned int)wdt);
- 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);
- }
- watchdog_set_nowayout(&bcm47xx_wdt_wdd, nowayout);
+ 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(&bcm47xx_wdt_notifier);
+ ret = register_reboot_notifier(&wdt->notifier);
if (ret)
- return ret;
+ goto err_timer;
- ret = watchdog_register_device(&bcm47xx_wdt_wdd);
- if (ret) {
- unregister_reboot_notifier(&bcm47xx_wdt_notifier);
- return ret;
- }
+ 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 void __exit bcm47xx_wdt_exit(void)
+static int __devexit bcm47xx_wdt_remove(struct platform_device *pdev)
{
- watchdog_unregister_device(&bcm47xx_wdt_wdd);
+ struct bcm47xx_wdt *wdt = dev_get_platdata(&pdev->dev);
+
+ if (!wdt)
+ return -ENXIO;
+
+ watchdog_unregister_device(&wdt->wdd);
+ unregister_reboot_notifier(&wdt->notifier);
- unregister_reboot_notifier(&bcm47xx_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 = __devexit_p(bcm47xx_wdt_remove),
+};
+
+module_platform_driver(bcm47xx_wdt_driver);
MODULE_AUTHOR("Aleksandar Radovanovic");
+MODULE_AUTHOR("Hauke Mehrtens <hauke@xxxxxxxxxx>");
MODULE_DESCRIPTION("Watchdog driver for Broadcom BCM47xx");
MODULE_LICENSE("GPL");
diff --git a/include/linux/bcm47xx_wdt.h b/include/linux/bcm47xx_wdt.h
new file mode 100644
index 0000000..b94ac0e
--- /dev/null
+++ b/include/linux/bcm47xx_wdt.h
@@ -0,0 +1,27 @@
+#ifndef LINUX_BCM47XX_WDT_H_
+#define LINUX_BCM47XX_WDT_H_
+
+#include <linux/notifier.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+
+
+struct bcm47xx_wdt {
+ u32 (*timer_set)(struct bcm47xx_wdt *, u32);
+ u32 (*timer_set_ms)(struct bcm47xx_wdt *, u32);
+
+ void *driver_data;
+
+ struct watchdog_device wdd;
+ struct notifier_block notifier;
+
+ struct timer_list soft_timer;
+ atomic_t soft_ticks;
+};
+
+static inline void *bcm47xx_wdt_get_drvdata(struct bcm47xx_wdt *wdt)
+{
+ return wdt->driver_data;
+}
+#endif /* LINUX_BCM47XX_WDT_H_ */
--
1.7.10.4
