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[WATCHDOG] orion5x_wdt: Add shutdown callback, use watchdog ping function 

* Added a callback to disable the watchdog on shutdown.
* Use a separate ping function to reduce the number of register accesses
  if the watchdog is already enabled and just needs to be reloaded.
* Minor cleanup of function names.

Signed-off-by: Thomas Reitmayr <treitmayr@devbase.at>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Thomas Reitmayr 2009-02-20 19:44:59 +01:00 committed by Wim Van Sebroeck
parent fc8a9d830f
commit df6707b219
1 changed files with 42 additions and 15 deletions
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57
drivers/watchdog/orion5x_wdt.c
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@ -42,7 +42,17 @@ static unsigned int wdt_tclk;
static unsigned long wdt_status;
static spinlock_t wdt_lock;
static void wdt_enable(void)
static void orion5x_wdt_ping(void)
{
spin_lock(&wdt_lock);
/* Reload watchdog duration */
writel(wdt_tclk * heartbeat, WDT_VAL);
spin_unlock(&wdt_lock);
}
static void orion5x_wdt_enable(void)
{
u32 reg;
@ -69,7 +79,7 @@ static void wdt_enable(void)
spin_unlock(&wdt_lock);
}
static void wdt_disable(void)
static void orion5x_wdt_disable(void)
{
u32 reg;
@ -101,7 +111,7 @@ static int orion5x_wdt_open(struct inode *inode, struct file *file)
if (test_and_set_bit(WDT_IN_USE, &wdt_status))
return -EBUSY;
clear_bit(WDT_OK_TO_CLOSE, &wdt_status);
wdt_enable();
orion5x_wdt_enable();
return nonseekable_open(inode, file);
}
@ -122,18 +132,28 @@ static ssize_t orion5x_wdt_write(struct file *file, const char *data,
set_bit(WDT_OK_TO_CLOSE, &wdt_status);
}
}
wdt_enable();
orion5x_wdt_ping();
}
return len;
}
static struct watchdog_info ident = {
static int orion5x_wdt_settimeout(int new_time)
{
if ((new_time <= 0) || (new_time > wdt_max_duration))
return -EINVAL;
/* Set new watchdog time to be used when
* orion5x_wdt_enable() or orion5x_wdt_ping() is called. */
heartbeat = new_time;
return 0;
}
static const struct watchdog_info ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_SETTIMEOUT |
WDIOF_KEEPALIVEPING,
.identity = "Orion5x Watchdog",
};
static long orion5x_wdt_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
@ -152,7 +172,7 @@ static long orion5x_wdt_ioctl(struct file *file, unsigned int cmd,
break;
case WDIOC_KEEPALIVE:
wdt_enable();
orion5x_wdt_ping();
ret = 0;
break;
@ -161,12 +181,11 @@ static long orion5x_wdt_ioctl(struct file *file, unsigned int cmd,
if (ret)
break;
if (time <= 0 || time > wdt_max_duration) {
if (orion5x_wdt_settimeout(time)) {
ret = -EINVAL;
break;
}
heartbeat = time;
wdt_enable();
orion5x_wdt_ping();
/* Fall through */
case WDIOC_GETTIMEOUT:
@ -187,7 +206,7 @@ static long orion5x_wdt_ioctl(struct file *file, unsigned int cmd,
static int orion5x_wdt_release(struct inode *inode, struct file *file)
{
if (test_bit(WDT_OK_TO_CLOSE, &wdt_status))
wdt_disable();
orion5x_wdt_disable();
else
printk(KERN_CRIT "WATCHDOG: Device closed unexpectedly - "
"timer will not stop\n");
@ -230,7 +249,7 @@ static int __devinit orion5x_wdt_probe(struct platform_device *pdev)
orion5x_wdt_miscdev.parent = &pdev->dev;
wdt_max_duration = WDT_MAX_CYCLE_COUNT / wdt_tclk;
if (heartbeat <= 0 || heartbeat > wdt_max_duration)
if (orion5x_wdt_settimeout(heartbeat))
heartbeat = wdt_max_duration;
ret = misc_register(&orion5x_wdt_miscdev);
@ -247,7 +266,7 @@ static int __devexit orion5x_wdt_remove(struct platform_device *pdev)
int ret;
if (test_bit(WDT_IN_USE, &wdt_status)) {
wdt_disable();
orion5x_wdt_disable();
clear_bit(WDT_IN_USE, &wdt_status);
}
@ -258,9 +277,16 @@ static int __devexit orion5x_wdt_remove(struct platform_device *pdev)
return ret;
}
static void orion5x_wdt_shutdown(struct platform_device *pdev)
{
if (test_bit(WDT_IN_USE, &wdt_status))
orion5x_wdt_disable();
}
static struct platform_driver orion5x_wdt_driver = {
.probe = orion5x_wdt_probe,
.remove = __devexit_p(orion5x_wdt_remove),
.shutdown = orion5x_wdt_shutdown,
.driver = {
.owner = THIS_MODULE,
.name = "orion5x_wdt",
@ -285,10 +311,11 @@ MODULE_AUTHOR("Sylver Bruneau <sylver.bruneau@googlemail.com>");
MODULE_DESCRIPTION("Orion5x Processor Watchdog");
module_param(heartbeat, int, 0);
MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds");
MODULE_PARM_DESC(heartbeat, "Initial watchdog heartbeat in seconds");
module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started");
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);