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authorBen Dooks <ben-linux@fluff.org>2005-08-17 09:03:23 +0200
committerWim Van Sebroeck <wim@iguana.be>2005-09-03 13:54:16 +0200
commitaf4bb822bc65efb087cd36b83789f22161a6515b (patch)
tree72ce7609578358929453e65c0c67796d5bff2b07 /drivers/char/watchdog
parent2dab3cabc4b3c1ef53965233dc8a05e0ddeeb38e (diff)
[WATCHDOG] s3c2410 watchdog power management
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>
Diffstat (limited to 'drivers/char/watchdog')
-rw-r--r--drivers/char/watchdog/s3c2410_wdt.c51
1 files changed, 48 insertions, 3 deletions
diff --git a/drivers/char/watchdog/s3c2410_wdt.c b/drivers/char/watchdog/s3c2410_wdt.c
index f85ac898a49..522435782e7 100644
--- a/drivers/char/watchdog/s3c2410_wdt.c
+++ b/drivers/char/watchdog/s3c2410_wdt.c
@@ -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);