omap3: Use a define for reboot reason offset

This introduces a define for the offset to the reboot reason, rather than
hardcoding it.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/cpu/armv7/omap3/boot.c

@@ -65,7 +65,8 @@ int omap_reboot_mode(char *mode, unsigned int length)
 	if (length < 2)
 		return -1;
 
-	reboot_mode = readl((u32 *)(OMAP34XX_SCRATCHPAD + 4));
+	reboot_mode = readl((u32 *)(OMAP34XX_SCRATCHPAD +
+		OMAP_REBOOT_REASON_OFFSET));
 
 	c = (reboot_mode >> 24) & 0xff;
 	if (c != 'B')
@@ -85,7 +86,7 @@ int omap_reboot_mode(char *mode, unsigned int length)
 
 int omap_reboot_mode_clear(void)
 {
-	writel(0, (u32 *)(OMAP34XX_SCRATCHPAD + 4));
+	writel(0, (u32 *)(OMAP34XX_SCRATCHPAD + OMAP_REBOOT_REASON_OFFSET));
 
 	return 0;
 }
@@ -96,7 +97,8 @@ int omap_reboot_mode_store(char *mode)
 
 	reboot_mode = 'B' << 24 | 'M' << 16 | mode[0];
 
-	writel(reboot_mode, (u32 *)(OMAP34XX_SCRATCHPAD + 4));
+	writel(reboot_mode, (u32 *)(OMAP34XX_SCRATCHPAD +
+		OMAP_REBOOT_REASON_OFFSET));
 
 	return 0;
 }

arch/arm/include/asm/arch-omap3/omap.h

@@ -249,6 +249,8 @@ struct gpio {
 /* ABB tranxdone mask */
 #define OMAP_ABB_MPU_TXDONE_MASK	(0x1 << 26)
 
+#define OMAP_REBOOT_REASON_OFFSET	0x04
+
 /* Boot parameters */
 #ifndef __ASSEMBLY__
 struct omap_boot_parameters {