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[WATCHDOG] s3c2410 watchdog power management

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Patch from Dimitry Andric <dimitry.andric@tomtom.com>, updated
by Ben Dooks <ben-linux@fluff.org>. Patch is against 2.6.11-mm2

Add power management support to the s3c2410 watchdog, so that
it is shut-down over suspend, and re-initialised on resume.

Also add Dimitry to the list of authors.

Signed-off-by: Dimitry Andric <dimitry.andric@tomtom.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Ben Dooks 2005-08-17 09:03:23 +02:00 committed by Wim Van Sebroeck
parent 2dab3cabc4
commit af4bb822bc
1 changed files with 48 additions and 3 deletions
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51
drivers/char/watchdog/s3c2410_wdt.c
View File

@ -27,7 +27,9 @@
* Fixed tmr_count / wdt_count confusion
* Added configurable debug
*
* 11-Jan-2004 BJD Fixed divide-by-2 in timeout code
* 11-Jan-2005 BJD Fixed divide-by-2 in timeout code
*
* 25-Jan-2005 DA Added suspend/resume support
*
* 10-Mar-2005 LCVR Changed S3C2410_VA to S3C24XX_VA
*/
@ -479,15 +481,57 @@ static int s3c2410wdt_remove(struct device *dev)
return 0;
}
#ifdef CONFIG_PM
static unsigned long wtcon_save;
static unsigned long wtdat_save;
static int s3c2410wdt_suspend(struct device *dev, u32 state, u32 level)
{
if (level == SUSPEND_POWER_DOWN) {
/* Save watchdog state, and turn it off. */
wtcon_save = readl(wdt_base + S3C2410_WTCON);
wtdat_save = readl(wdt_base + S3C2410_WTDAT);
/* Note that WTCNT doesn't need to be saved. */
s3c2410wdt_stop();
}
return 0;
}
static int s3c2410wdt_resume(struct device *dev, u32 level)
{
if (level == RESUME_POWER_ON) {
/* Restore watchdog state. */
writel(wtdat_save, wdt_base + S3C2410_WTDAT);
writel(wtdat_save, wdt_base + S3C2410_WTCNT); /* Reset count */
writel(wtcon_save, wdt_base + S3C2410_WTCON);
printk(KERN_INFO PFX "watchdog %sabled\n",
(wtcon_save & S3C2410_WTCON_ENABLE) ? "en" : "dis");
}
return 0;
}
#else
#define s3c2410wdt_suspend NULL
#define s3c2410wdt_resume NULL
#endif /* CONFIG_PM */
static struct device_driver s3c2410wdt_driver = {
.name = "s3c2410-wdt",
.bus = &platform_bus_type,
.probe = s3c2410wdt_probe,
.remove = s3c2410wdt_remove,
.suspend = s3c2410wdt_suspend,
.resume = s3c2410wdt_resume,
};
static char banner[] __initdata = KERN_INFO "S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics\n";
static int __init watchdog_init(void)
@ -505,7 +549,8 @@ static void __exit watchdog_exit(void)
module_init(watchdog_init);
module_exit(watchdog_exit);
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>, "
"Dimitry Andric <dimitry.andric@tomtom.com>");
MODULE_DESCRIPTION("S3C2410 Watchdog Device Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);