bootcount_davinci: Switch to scratch register #2

The RTC IP block here provides 3 scratch registers.  Currently when
using DeepSleep on am335x the scratch0/1 registers are used so moving
ourself to scratch2 makes cooperation easier.

Signed-off-by: Tom Rini <trini@ti.com>

drivers/bootcount/bootcount_davinci.c

@@ -20,17 +20,19 @@ void bootcount_store(ulong a)
 	 */
 	writel(RTC_KICK0R_WE, &reg->kick0r);
 	writel(RTC_KICK1R_WE, &reg->kick1r);
-	raw_bootcount_store(&reg->scratch0, a);
-	raw_bootcount_store(&reg->scratch1, BOOTCOUNT_MAGIC);
+	raw_bootcount_store(&reg->scratch2,
+			    (BOOTCOUNT_MAGIC & 0xffff0000) | (a & 0x0000ffff));
 }
 
 ulong bootcount_load(void)
 {
+	unsigned long val;
 	struct davinci_rtc *reg =
 		(struct davinci_rtc *)CONFIG_SYS_BOOTCOUNT_ADDR;
 
-	if (raw_bootcount_load(&reg->scratch1) != BOOTCOUNT_MAGIC)
+	val = raw_bootcount_load(&reg->scratch2);
+	if ((val & 0xffff0000) != (BOOTCOUNT_MAGIC & 0xffff0000))
 		return 0;
 	else
-		return raw_bootcount_load(&reg->scratch0);
+		return val & 0x0000ffff;
 }