ARM: S5P: Add s5p_reset_hook() for perform reset using SWRESET on S5P SoCs

This patch adds s5p_reset_hook() which includes software reset
by using SWRESET.

Signed-off-by: Jongpill Lee <boyko.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/plat-s5p/include/plat/reset.h

@@ -0,0 +1,16 @@
+/* linux/arch/arm/plat-s5p/include/plat/reset.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#ifndef __ASM_PLAT_S5P_RESET_H
+#define __ASM_PLAT_S5P_RESET_H __FILE__
+
+extern void (*s5p_reset_hook)(void);
+
+#endif /* __ASM_PLAT_S5P_RESET_H */

arch/arm/plat-s5p/include/plat/system-reset.h

@@ -14,10 +14,17 @@
 
 #include <plat/watchdog-reset.h>
 
+void (*s5p_reset_hook)(void);
+
 static void arch_reset(char mode, const char *cmd)
 {
-	/* Perform reset using Watchdog reset.
-	 * SWRESET support will be added later.
+	/* SWRESET support in s5p_reset_hook() */
+
+	if (s5p_reset_hook)
+		s5p_reset_hook();
+
+	/* Perform reset using Watchdog reset
+	 * if there is no s5p_reset_hook()
 	 */
 
 	arch_wdt_reset();