omap3: String-based reboot mode handling

This switches reboot mode handling to a string-based interface, that allows more
flexibility to set a common interface with the next generations of OMAP devices.

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

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

@@ -57,11 +57,14 @@ u32 omap_sys_boot_device(void)
 	return boot_devices[sys_boot];
 }
 
-char omap_reboot_mode(void)
+int omap_reboot_mode(char *mode, unsigned int length)
 {
 	u32 reboot_mode;
 	char c;
 
+	if (length < 2)
+		return -1;
+
 	reboot_mode = readl((u32 *)(OMAP34XX_SCRATCHPAD + 4));
 
 	c = (reboot_mode >> 24) & 0xff;
@@ -74,7 +77,10 @@ char omap_reboot_mode(void)
 
 	c = reboot_mode & 0xff;
 
-	return c;
+	mode[0] = c;
+	mode[1] = '\0';
+
+	return 0;
 }
 
 int omap_reboot_mode_clear(void)
@@ -84,11 +90,11 @@ int omap_reboot_mode_clear(void)
 	return 0;
 }
 
-int omap_reboot_mode_store(char c)
+int omap_reboot_mode_store(char *mode)
 {
 	u32 reboot_mode;
 
-	reboot_mode = 'B' << 24 | 'M' << 16 | c;
+	reboot_mode = 'B' << 24 | 'M' << 16 | mode[0];
 
 	writel(reboot_mode, (u32 *)(OMAP34XX_SCRATCHPAD + 4));
 

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

@@ -260,9 +260,9 @@ struct omap_boot_parameters {
 	unsigned int boot_device_descriptor;
 };
 
-char omap_reboot_mode(void);
+int omap_reboot_mode(char *mode, unsigned int length);
 int omap_reboot_mode_clear(void);
-int omap_reboot_mode_store(char c);
+int omap_reboot_mode_store(char *mode);
 #endif
 
 #endif

board/lge/sniper/sniper.c

@@ -109,7 +109,7 @@ int misc_init_r(void)
 
 	/* Reboot mode */
 
-	reboot_mode[0] = omap_reboot_mode();
+	omap_reboot_mode(reboot_mode, sizeof(reboot_mode));
 
 	if (keys[0])
 		reboot_mode[0] = 'r';
@@ -159,12 +159,12 @@ void get_board_serial(struct tag_serialnr *serialnr)
 
 void reset_misc(void)
 {
-	omap_reboot_mode_store('u');
+	omap_reboot_mode_store("u");
 }
 
 int fb_set_reboot_flag(void)
 {
-	return omap_reboot_mode_store('b');
+	return omap_reboot_mode_store("b");
 }
 
 #ifndef CONFIG_SPL_BUILD