powerpc/85xx: Add support for Book-E MMU Arch v2.0

A few of the config registers changed definition between MMU v1.0 and
MMUv2.0.  The new e6500 core from Freescale implements v2.0 of the
architecture.

Specifically, how we determine the size of TLB entries we support in the
variable size (or TLBCAM/TLB1) array is specified in a new register
(TLBnPS - TLB n Page size) instead of via TLBnCFG.

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

arch/powerpc/cpu/mpc85xx/tlb.c

@@ -252,16 +252,20 @@ setup_ddr_tlbs_phys(phys_addr_t p_addr, unsigned int memsize_in_meg)
 	unsigned int tlb_size;
 	unsigned int wimge = 0;
 	unsigned int ram_tlb_address = (unsigned int)CONFIG_SYS_DDR_SDRAM_BASE;
-	unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xf;
+	unsigned int max_cam;
 	u64 size, memsize = (u64)memsize_in_meg << 20;
 
 #ifdef CONFIG_SYS_PPC_DDR_WIMGE
 	wimge = CONFIG_SYS_PPC_DDR_WIMGE;
 #endif
 	size = min(memsize, CONFIG_MAX_MEM_MAPPED);
-
-	/* Convert (4^max) kB to (2^max) bytes */
-	max_cam = max_cam * 2 + 10;
+	if ((mfspr(SPRN_MMUCFG) & MMUCFG_MAVN) == MMUCFG_MAVN_V1) {
+		/* Convert (4^max) kB to (2^max) bytes */
+		max_cam = ((mfspr(SPRN_TLB1CFG) >> 16) & 0xf) * 2 + 10;
+	} else {
+		/* Convert (2^max) kB to (2^max) bytes */
+		max_cam = __ilog2(mfspr(SPRN_TLB1PS)) + 10;
+	}
 
 	for (i = 0; size && i < 8; i++) {
 		int ram_tlb_index = find_free_tlbcam();

arch/powerpc/include/asm/processor.h

@@ -513,7 +513,13 @@
 
 #define SPRN_TLB0CFG	0x2B0	/* TLB 0 Config Register */
 #define SPRN_TLB1CFG	0x2B1	/* TLB 1 Config Register */
+#define SPRN_TLB0PS	0x158	/* TLB 0 Page Size Register */
+#define SPRN_TLB1PS	0x159	/* TLB 1 Page Size Register */
 #define SPRN_MMUCSR0	0x3f4	/* MMU control and status register 0 */
+#define SPRN_MMUCFG	0x3F7	/* MMU Configuration Register */
+#define MMUCFG_MAVN	0x00000003	/* MMU Architecture Version Number */
+#define MMUCFG_MAVN_V1	0x00000000	/* v1.0 */
+#define MMUCFG_MAVN_V2	0x00000001	/* v2.0 */
 #define SPRN_MAS0	0x270	/* MMU Assist Register 0 */
 #define SPRN_MAS1	0x271	/* MMU Assist Register 1 */
 #define SPRN_MAS2	0x272	/* MMU Assist Register 2 */