Add S3C2410 (Samsung ARM9 Mobile SoC) watchdog driver

arch/arm/configs/bast_defconfig

@@ -479,12 +479,19 @@ CONFIG_PPDEV=y
 #
 # Watchdog Cards
 #
-# CONFIG_WATCHDOG is not set
+CONFIG_WATCHDOG=y
+# CONFIG_WATCHDOG_NOWAYOUT is not set
+
+#
+# Watchdog Device Drivers
+#
+# CONFIG_SOFT_WATCHDOG is not set
+CONFIG_S3C2410_WATCHDOG=y
 # CONFIG_NVRAM is not set
 CONFIG_RTC=y
 # CONFIG_DTLK is not set
 # CONFIG_R3964 is not set
-# CONFIG_APPLICOM is not set
+
 
 #
 # Ftape, the floppy tape device driver

arch/arm/configs/s3c2410_defconfig

@@ -493,7 +493,14 @@ CONFIG_PPDEV=y
 #
 # Watchdog Cards
 #
-# CONFIG_WATCHDOG is not set
+CONFIG_WATCHDOG=y
+# CONFIG_WATCHDOG_NOWAYOUT is not set
+
+#
+# Watchdog Device Drivers
+#
+# CONFIG_SOFT_WATCHDOG is not set
+CONFIG_S3C2410_WATCHDOG=y
 # CONFIG_NVRAM is not set
 CONFIG_RTC=y
 # CONFIG_DTLK is not set

drivers/char/watchdog/Kconfig

@@ -106,6 +106,22 @@ config IXP2000_WATCHDOG
 
 	  Say N if you are unsure.
 
+config S3C2410_WATCHDOG
+	tristate "S3C2410 Watchdog"
+	depends on WATCHDOG && ARCH_S3C2410
+	help
+	  Watchdog timer block in the Samsung S3C2410 chips. This will
+	  reboot the system when the timer expires with the watchdog
+	  enabled.
+
+	  The driver is limited by the speed of the system's PCLK
+	  signal, so with reasonbaly fast systems (PCLK around 50-66MHz)
+	  then watchdog intervals of over approximately 20seconds are
+	  unavailable.
+
+	  The driver can be built as a module by choosing M, and will
+	  be called s3c2410_wdt
+
 config SA1100_WATCHDOG
 	tristate "SA1100/PXA2xx watchdog"
 	depends on WATCHDOG && ( ARCH_SA1100 || ARCH_PXA )

drivers/char/watchdog/Makefile

@@ -21,6 +21,7 @@ obj-$(CONFIG_977_WATCHDOG) += wdt977.o
 obj-$(CONFIG_I8XX_TCO) += i8xx_tco.o
 obj-$(CONFIG_MACHZ_WDT) += machzwd.o
 obj-$(CONFIG_SH_WDT) += shwdt.o
+obj-$(CONFIG_S3C2410_WATCHDOG) += s3c2410_wdt.o
 obj-$(CONFIG_SA1100_WATCHDOG) += sa1100_wdt.o
 obj-$(CONFIG_EUROTECH_WDT) += eurotechwdt.o
 obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o

include/asm-arm/arch-s3c2410/regs-watchdog.h

@@ -38,6 +38,7 @@
 #define S3C2410_WTCON_DIV128  (3<<3)
 
 #define S3C2410_WTCON_PRESCALE(x) ((x) << 8)
+#define S3C2410_WTCON_PRESCALE_MASK (0xff00)
 
 #endif /* __ASM_ARCH_REGS_WATCHDOG_H */