[ARM] S3C64XX: Use common watchdog reset for system reset.

Use the newly moved <plat/watchdog-reset.h> to perform the
arch_reset() call which has been unimplemented for a while.
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/mach-s3c6400/include/mach/map.h

@@ -40,6 +40,7 @@
 
 #define S3C64XX_PA_FB		(0x77100000)
 #define S3C64XX_PA_USB_HSOTG	(0x7C000000)
+#define S3C64XX_PA_WATCHDOG	(0x7E004000)
 #define S3C64XX_PA_SYSCON	(0x7E00F000)
 #define S3C64XX_PA_TIMER	(0x7F006000)
 #define S3C64XX_PA_IIC0		(0x7F004000)

arch/arm/mach-s3c6400/include/mach/system.h

@@ -11,6 +11,8 @@
 #ifndef __ASM_ARCH_SYSTEM_H
 #define __ASM_ARCH_SYSTEM_H __FILE__
 
+#include <plat/watchdog-reset.h>
+
 static void arch_idle(void)
 {
 	/* nothing here yet */
@@ -18,7 +20,11 @@ static void arch_idle(void)
 
 static void arch_reset(char mode, const char *cmd)
 {
-	/* nothing here yet */
+	if (mode != 's')
+		arch_wdt_reset();
+
+	/* if all else fails, or mode was for soft, jump to 0 */
+	cpu_reset(0);
 }
 
 #endif /* __ASM_ARCH_IRQ_H */

arch/arm/plat-s3c/include/plat/watchdog-reset.h

@@ -11,6 +11,7 @@
 */
 
 #include <plat/regs-watchdog.h>
+#include <mach/map.h>
 
 #include <linux/clk.h>
 #include <linux/err.h>

arch/arm/plat-s3c64xx/cpu.c

@@ -102,6 +102,11 @@ static struct map_desc s3c_iodesc[] __initdata = {
 		.pfn		= __phys_to_pfn(S3C64XX_PA_MODEM),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	}, {
+		.virtual	= (unsigned long)S3C_VA_WATCHDOG,
+		.pfn		= __phys_to_pfn(S3C64XX_PA_WATCHDOG),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	},
 };