powerpc/fsl-booke: Add support for FSL Arch v1.0 MMU in setup_page_sizes

Update setup_page_sizes() to support for a MMU v1.0 FSL style MMU
implementation.  In such a processor, we don't have TLB0PS or EPTCFG
registers (and access to these registers may cause exceptions).  We need
to parse the older format of TLBnCFG for page size support.  Additionaly,
assume since we are an FSL implementation that we have 2 TLB arrays and
the second array contains the variable size pages.

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

1 files changed, 39 insertions, 3 deletions

diff --git a/arch/powerpc/mm/tlb_nohash.c b/arch/powerpc/mm/tlb_nohash.c
index fe391e9..6651899 100644
--- a/arch/powerpc/mm/tlb_nohash.c
+++ b/arch/powerpc/mm/tlb_nohash.c
@@ -349,11 +349,47 @@ void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address)
 
 static void setup_page_sizes(void)
 {
-	unsigned int tlb0cfg = mfspr(SPRN_TLB0CFG);
-	unsigned int tlb0ps = mfspr(SPRN_TLB0PS);
-	unsigned int eptcfg = mfspr(SPRN_EPTCFG);
+	unsigned int tlb0cfg;
+	unsigned int tlb0ps;
+	unsigned int eptcfg;
 	int i, psize;
 
+#ifdef CONFIG_PPC_FSL_BOOK3E
+	unsigned int mmucfg = mfspr(SPRN_MMUCFG);
+
+	if (((mmucfg & MMUCFG_MAVN) == MMUCFG_MAVN_V1) &&
+		(mmu_has_feature(MMU_FTR_TYPE_FSL_E))) {
+		unsigned int tlb1cfg = mfspr(SPRN_TLB1CFG);
+		unsigned int min_pg, max_pg;
+
+		min_pg = (tlb1cfg & TLBnCFG_MINSIZE) >> TLBnCFG_MINSIZE_SHIFT;
+		max_pg = (tlb1cfg & TLBnCFG_MAXSIZE) >> TLBnCFG_MAXSIZE_SHIFT;
+
+		for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
+			struct mmu_psize_def *def;
+			unsigned int shift;
+
+			def = &mmu_psize_defs[psize];
+			shift = def->shift;
+
+			if (shift == 0)
+				continue;
+
+			/* adjust to be in terms of 4^shift Kb */
+			shift = (shift - 10) >> 1;
+
+			if ((shift >= min_pg) && (shift <= max_pg))
+				def->flags |= MMU_PAGE_SIZE_DIRECT;
+		}
+
+		goto no_indirect;
+	}
+#endif
+
+	tlb0cfg = mfspr(SPRN_TLB0CFG);
+	tlb0ps = mfspr(SPRN_TLB0PS);
+	eptcfg = mfspr(SPRN_EPTCFG);
+
 	/* Look for supported direct sizes */
 	for (psize = 0; psize < MMU_PAGE_COUNT; ++psize) {
 		struct mmu_psize_def *def = &mmu_psize_defs[psize];