85xx: Cleanup L2 cache size detection

The L2 size detection code was a bit confusing and we kept having to add
code to it to handle new processors.  Change the sense of detection so we
look for the older processors that aren't changing.

Also added support for 1M cache size on 8572.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

cpu/mpc85xx/cpu_init.c

@@ -261,37 +261,50 @@ int cpu_init_r(void)
 	volatile uint cache_ctl;
 	uint svr, ver;
 	uint l2srbar;
+	u32 l2siz_field;
 
 	svr = get_svr();
 	ver = SVR_SOC_VER(svr);
 
 	asm("msync;isync");
 	cache_ctl = l2cache->l2ctl;
+	l2siz_field = (cache_ctl >> 28) & 0x3;
 
-	switch (cache_ctl & 0x30000000) {
-	case 0x20000000:
-		if (ver == SVR_8548 || ver == SVR_8548_E ||
-		    ver == SVR_8544 || ver == SVR_8568_E) {
-			puts ("512 KB ");
-			/* set L2E=1, L2I=1, & L2SRAM=0 */
-			cache_ctl = 0xc0000000;
+	switch (l2siz_field) {
+	case 0x0:
+		printf(" unknown size (0x%08x)\n", cache_ctl);
+		return -1;
+		break;
+	case 0x1:
+		if (ver == SVR_8540 || ver == SVR_8560   ||
+		    ver == SVR_8541 || ver == SVR_8541_E ||
+		    ver == SVR_8555 || ver == SVR_8555_E) {
+			puts("128 KB ");
+			/* set L2E=1, L2I=1, & L2BLKSZ=1 (128 Kbyte) */
+			cache_ctl = 0xc4000000;
 		} else {
 			puts("256 KB ");
+			cache_ctl = 0xc0000000; /* set L2E=1, L2I=1, & L2SRAM=0 */
+		}
+		break;
+	case 0x2:
+		if (ver == SVR_8540 || ver == SVR_8560   ||
+		    ver == SVR_8541 || ver == SVR_8541_E ||
+		    ver == SVR_8555 || ver == SVR_8555_E) {
+			puts("256 KB ");
 			/* set L2E=1, L2I=1, & L2BLKSZ=2 (256 Kbyte) */
 			cache_ctl = 0xc8000000;
+		} else {
+			puts ("512 KB ");
+			/* set L2E=1, L2I=1, & L2SRAM=0 */
+			cache_ctl = 0xc0000000;
 		}
 		break;
-	case 0x10000000:
-		puts("256 KB ");
-		if (ver == SVR_8544 || ver == SVR_8544_E) {
-			cache_ctl = 0xc0000000; /* set L2E=1, L2I=1, & L2SRAM=0 */
-		}
+	case 0x3:
+		puts("1024 KB ");
+		/* set L2E=1, L2I=1, & L2SRAM=0 */
+		cache_ctl = 0xc0000000;
 		break;
-	case 0x30000000:
-	case 0x00000000:
-	default:
-		printf(" unknown size (0x%08x)\n", cache_ctl);
-		return -1;
 	}
 
 	if (l2cache->l2ctl & 0x80000000) {