ARM: 5864/1: Implement arch_reset() in NUC900

Implement arch_reset(), reboot from shell become possible.

Signed-off-by: lijie <eltshanli@gmail.com>
Acked-by: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-w90x900/include/mach/system.h

@@ -15,14 +15,27 @@
  *
  */
 
+#include <linux/io.h>
 #include <asm/proc-fns.h>
+#include <mach/map.h>
+#include <mach/regs-timer.h>
+
+#define	WTCR	(TMR_BA + 0x1C)
+#define	WTCLK	(1 << 10)
+#define	WTE	(1 << 7)
+#define	WTRE	(1 << 1)
 
 static void arch_idle(void)
 {
 }
 
 static void arch_reset(char mode, const char *cmd)
 {
-	cpu_reset(0);
+	if (mode == 's') {
+		/* Jump into ROM at address 0 */
+		cpu_reset(0);
+	} else {
+		__raw_writel(WTE | WTRE | WTCLK, WTCR);
+	}
 }