watchdog: Intel SCU Watchdog Timer Driver for Moorestown and Medfield…

… platforms.

This submission includes:
  - Fix to intel_scu_write() to start watchdog timer the on the
    first write, and refresh on subsequent writes.
    This enables Open, write, write, ... usage model.
  - Moves boot parameter checks from intel_scu_open() to
    intel_scu_watchdog_init(), so driver init will fail if these
    parameters are out of bounds.
  - Adds check for whether process waiting in wait_event_interruptible()
    received a signal while it was waiting.
  - Other small error handling changes.

Removed the read() method for now as that wass a non-standard behaviour.

Signed-off-by: Donald Johnson <donald.k.johnson@intel.com>
Signed-off-by: Shuduo Sang <shuduo.sang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/Kconfig

@@ -533,6 +533,16 @@ config I6300ESB_WDT
 	  To compile this driver as a module, choose M here: the
 	  module will be called i6300esb.
 
+config INTEL_SCU_WATCHDOG
+	bool "Intel SCU Watchdog for Mobile Platforms"
+	depends on WATCHDOG
+	depends on INTEL_SCU_IPC
+	---help---
+	  Hardware driver for the watchdog time built into the Intel SCU
+	  for Intel Mobile Platforms.
+
+	  To compile this driver as a module, choose M here.
+
 config ITCO_WDT
 	tristate "Intel TCO Timer/Watchdog"
 	depends on (X86 || IA64) && PCI

drivers/watchdog/Makefile

@@ -102,6 +102,7 @@ obj-$(CONFIG_W83877F_WDT) += w83877f_wdt.o
 obj-$(CONFIG_W83977F_WDT) += w83977f_wdt.o
 obj-$(CONFIG_MACHZ_WDT) += machzwd.o
 obj-$(CONFIG_SBC_EPX_C3_WATCHDOG) += sbc_epx_c3.o
+obj-$(CONFIG_INTEL_SCU_WATCHDOG) += intel_scu_watchdog.o
 
 # M32R Architecture