[COMMON] watchdog: s3c2410_wdt: add stutdown disable

- When system failure after watchdog driver shutdown,
  there is no way to reboot, just system hang (with black screen).
- To prevent system hang, watchdog must not be disabled after shutdown.
- But sometimes watchdog must be disabled to debug reset sequence.
  So, define with config : S3C2410_SHUTDOWN_REBOOT

- This configuration is recommended for user case.

Change-Id: I2cfcc6d922f2ccd8cd91d0059fb6f79e9fd40854
Signed-off-by: hajun.sung <hajun.sung@samsung.com>

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 3ece1335ba8403e1acaee1b4cb714c95b8b0a570..e38f6ab20c7b55a733e843f9a752618336b6b1c3 100644 (file)
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -379,6 +379,18 @@ config S3C2410_WATCHDOG
          The driver can be built as a module by choosing M, and will
          be called s3c2410_wdt
 
+config S3C2410_SHUTDOWN_REBOOT
+       bool "Support watchdog reset after watchdog shutdown"
+       depends on S3C2410_WATCHDOG
+       default n
+       help
+         This config disable the shutdown function of S3C2410 watchdog.
+         To prevent stuck after watchdog driver shutdown, shutdown
+         function will not stop or disable watchdog and it will just
+         kick 30 second. It will prevent being stucked in reset
+         sequence with some other failure.
+         This feature is not recommeneded for debugging.
+
 config SA1100_WATCHDOG
        tristate "SA1100/PXA2xx watchdog"
        depends on ARCH_SA1100 || ARCH_PXA

diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
index 7438997720380663f82e07f467fe5a7c4cba8c22..a840ff7a13387e2932ce3325a564220ad105352d 100644 (file)
--- a/drivers/watchdog/s3c2410_wdt.c
+++ b/drivers/watchdog/s3c2410_wdt.c
@@ -1212,6 +1212,10 @@ static int s3c2410wdt_remove(struct platform_device *dev)
 
 static void s3c2410wdt_shutdown(struct platform_device *dev)
 {
+#ifdef CONFIG_S3C2410_SHUTDOWN_REBOOT
+       pr_emerg("%s: watchdog is still alive\n", __func__);
+       s3c2410wdt_keepalive_emergency(true, 0);
+#else
        struct s3c2410_wdt *wdt = platform_get_drvdata(dev);
 
        /* Only little cluster watchdog excute mask function */
@@ -1219,6 +1223,7 @@ static void s3c2410wdt_shutdown(struct platform_device *dev)
                s3c2410wdt_mask_wdt_reset(wdt, true);
 
        s3c2410wdt_stop(&wdt->wdt_device);
+#endif
 }
 
 static struct platform_driver s3c2410wdt_driver = {