85xx: Add basic e500mc core support

Introduce CONFIG_E500MC to deal with the minor differences between
e500v2 and e500mc.

* Certain fields of HID0/1 don't exist anymore on e500mc
* Cache line size is 64-bytes on e500mc
* reset value of PIR is different
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

cpu/mpc85xx/cpu.c

@@ -134,6 +134,10 @@ int checkcpu (void)
 	    puts("Unknown");
 	    break;
 	}
+
+	if (PVR_MEM(pvr) == 0x03)
+		puts("MC");
+
 	printf(", Version: %d.%d, (0x%08x)\n", major, minor, pvr);
 
 	get_sys_info(&sysinfo);

cpu/mpc85xx/release.S

@@ -24,14 +24,18 @@
 __secondary_start_page:
 /* First do some preliminary setup */
 	lis	r3, HID0_EMCP@h		/* enable machine check */
+#ifndef CONFIG_E500MC
 	ori	r3,r3,HID0_TBEN@l	/* enable Timebase */
+#endif
 #ifdef CONFIG_PHYS_64BIT
 	ori	r3,r3,HID0_ENMAS7@l	/* enable MAS7 updates */
 #endif
 	mtspr	SPRN_HID0,r3
 
+#ifndef CONFIG_E500MC
 	li	r3,(HID1_ASTME|HID1_ABE)@l	/* Addr streaming & broadcast */
 	mtspr	SPRN_HID1,r3
+#endif
 
 	/* Enable branch prediction */
 	li	r3,0x201
@@ -64,7 +68,11 @@ __secondary_start_page:
 
 	/* r10 has the base address for the entry */
 	mfspr	r0,SPRN_PIR
+#ifdef CONFIG_E500MC
+	rlwinm	r4,r0,27,27,31
+#else
 	mr	r4,r0
+#endif
 	slwi	r8,r4,5
 	add	r10,r3,r8
 

cpu/mpc85xx/start.S

@@ -163,8 +163,10 @@ _start_e500:
 	ori	r0,r0,HID0_TBEN@l	/* Enable Timebase */
 	mtspr	HID0,r0
 
+#ifndef CONFIG_E500MC
 	li	r0,(HID1_ASTME|HID1_ABE)@l	/* Addr streaming & broadcast */
 	mtspr	HID1,r0
+#endif
 
 	/* Enable Branch Prediction */
 #if defined(CONFIG_BTB)

include/asm-ppc/cache.h

@@ -12,6 +12,8 @@
 #define	L1_CACHE_SHIFT	4
 #elif defined(CONFIG_PPC64BRIDGE)
 #define L1_CACHE_SHIFT	7
+#elif defined(CONFIG_E500MC)
+#define L1_CACHE_SHIFT	6
 #else
 #define	L1_CACHE_SHIFT	5
 #endif