85xx: Set HID1[mbdd] on e500v2 rev5.0 or greater

The HID1[MBDD] bit is new on rev5.0 or greater cores and will optimize
the performance of mbar/eieio instructions.

Signed-off-by: Sandeep Gopalpet <sandeep.kumar@freescale.com>

cpu/mpc85xx/release.S

@@ -57,6 +57,13 @@ __secondary_start_page:
 
 #ifndef CONFIG_E500MC
 	li	r3,(HID1_ASTME|HID1_ABE)@l	/* Addr streaming & broadcast */
+	mfspr   r0,PVR
+	andi.	r0,r0,0xff
+	cmpwi	r0,0x50@l	/* if we are rev 5.0 or greater set MBDD */
+	blt 1f
+	/* Set MBDD bit also */
+	ori r3, r3, HID1_MBDD@l
+1:
 	mtspr	SPRN_HID1,r3
 #endif
 

cpu/mpc85xx/start.S

@@ -208,6 +208,13 @@ _start_e500:
 
 #ifndef CONFIG_E500MC
 	li	r0,(HID1_ASTME|HID1_ABE)@l	/* Addr streaming & broadcast */
+	mfspr	r3,PVR
+	andi.	r3,r3, 0xff
+	cmpwi	r3,0x50@l	/* if we are rev 5.0 or greater set MBDD */
+	blt 1f
+	/* Set MBDD bit also */
+	ori r0, r0, HID1_MBDD@l
+1:
 	mtspr	HID1,r0
 #endif
 

include/asm-ppc/processor.h

@@ -265,6 +265,7 @@
 #define	  HID1_RFXE	(1<<17)		/* Read Fault Exception Enable */
 #define	  HID1_ASTME	(1<<13)		/* Address bus streaming mode */
 #define	  HID1_ABE	(1<<12)		/* Address broadcast enable */
+#define	  HID1_MBDD	(1<<6)		/* optimized sync instruction */
 #define SPRN_IABR	0x3F2	/* Instruction Address Breakpoint Register */
 #ifndef CONFIG_BOOKE
 #define SPRN_IAC1	0x3F4	/* Instruction Address Compare 1 */