From bd491781097f150687906008d639936a0c00ed90 Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Thu, 14 Apr 2011 22:32:02 +0000
Subject: [PATCH] powerpc: Add TLB size detection for TYPE_3E MMUs
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/powerpc/include/asm/mmu-book3e.h | 15 +++++++++++++++
arch/powerpc/mm/mmu_context_nohash.c | 12 +++++++++++-
2 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/mmu-book3e.h b/arch/powerpc/include/asm/mmu-book3e.h
index 17194fcd4040d..80d68afb02007 100644
--- a/arch/powerpc/include/asm/mmu-book3e.h
+++ b/arch/powerpc/include/asm/mmu-book3e.h
@@ -137,6 +137,21 @@
#define MMUCSR0_TLB2PS 0x00078000 /* TLB2 Page Size */
#define MMUCSR0_TLB3PS 0x00780000 /* TLB3 Page Size */
+/* MMUCFG bits */
+#define MMUCFG_MAVN_NASK 0x00000003
+#define MMUCFG_MAVN_V1_0 0x00000000
+#define MMUCFG_MAVN_V2_0 0x00000001
+#define MMUCFG_NTLB_MASK 0x0000000c
+#define MMUCFG_NTLB_SHIFT 2
+#define MMUCFG_PIDSIZE_MASK 0x000007c0
+#define MMUCFG_PIDSIZE_SHIFT 6
+#define MMUCFG_TWC 0x00008000
+#define MMUCFG_LRAT 0x00010000
+#define MMUCFG_RASIZE_MASK 0x00fe0000
+#define MMUCFG_RASIZE_SHIFT 17
+#define MMUCFG_LPIDSIZE_MASK 0x0f000000
+#define MMUCFG_LPIDSIZE_SHIFT 24
+
/* TLBnCFG encoding */
#define TLBnCFG_N_ENTRY 0x00000fff /* number of entries */
#define TLBnCFG_HES 0x00002000 /* HW select supported */
diff --git a/arch/powerpc/mm/mmu_context_nohash.c b/arch/powerpc/mm/mmu_context_nohash.c
index 4d8fa911c73dd..336807de550ef 100644
--- a/arch/powerpc/mm/mmu_context_nohash.c
+++ b/arch/powerpc/mm/mmu_context_nohash.c
@@ -409,7 +409,17 @@ void __init mmu_context_init(void)
} else if (mmu_has_feature(MMU_FTR_TYPE_47x)) {
first_context = 1;
last_context = 65535;
- } else {
+ } else
+#ifdef CONFIG_PPC_BOOK3E_MMU
+ if (mmu_has_feature(MMU_FTR_TYPE_3E)) {
+ u32 mmucfg = mfspr(SPRN_MMUCFG);
+ u32 pid_bits = (mmucfg & MMUCFG_PIDSIZE_MASK)
+ >> MMUCFG_PIDSIZE_SHIFT;
+ first_context = 1;
+ last_context = (1UL << (pid_bits + 1)) - 1;
+ } else
+#endif
+ {
first_context = 1;
last_context = 255;
}
--
2.30.2