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>
diff --git a/arch/powerpc/cpu/mpc85xx/tlb.c b/arch/powerpc/cpu/mpc85xx/tlb.c
index 01a3561..80ad04a 100644
--- a/arch/powerpc/cpu/mpc85xx/tlb.c
+++ b/arch/powerpc/cpu/mpc85xx/tlb.c
@@ -252,16 +252,20 @@
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();