Some boot loaders may not enable L1 instruction/data cache. Check if
data and instruction caches are enabled, and enable them if needed.
Signed-off-by: Nate Case <nc...@xes-inc.com>
---
arch/powerpc/include/asm/reg_booke.h | 2 +
arch/powerpc/kernel/cpu_setup_fsl_booke.S | 49 +++++++++++++++++++++++++++--
2 files changed, 48 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/reg_booke.h
b/arch/powerpc/include/asm/reg_booke.h
index 601ddbc..6bcf364 100644
--- a/arch/powerpc/include/asm/reg_booke.h
+++ b/arch/powerpc/include/asm/reg_booke.h
@@ -389,12 +389,14 @@
#define ICCR_CACHE 1 /* Cacheable */
/* Bit definitions for L1CSR0. */
+#define L1CSR0_CPE 0x00010000 /* Data Cache Parity Enable */
#define L1CSR0_CLFC 0x00000100 /* Cache Lock Bits Flash Clear */
#define L1CSR0_DCFI 0x00000002 /* Data Cache Flash Invalidate */
#define L1CSR0_CFI 0x00000002 /* Cache Flash Invalidate */
#define L1CSR0_DCE 0x00000001 /* Data Cache Enable */
/* Bit definitions for L1CSR1. */
+#define L1CSR1_CPE 0x00010000 /* Instruction Cache Parity Enable */
#define L1CSR1_ICLFR 0x00000100 /* Instr Cache Lock Bits Flash Reset */
#define L1CSR1_ICFI 0x00000002 /* Instr Cache Flash Invalidate */
#define L1CSR1_ICE 0x00000001 /* Instr Cache Enable */
diff --git a/arch/powerpc/kernel/cpu_setup_fsl_booke.S
b/arch/powerpc/kernel/cpu_setup_fsl_booke.S
index eb4b9ad..0adb50a 100644
--- a/arch/powerpc/kernel/cpu_setup_fsl_booke.S
+++ b/arch/powerpc/kernel/cpu_setup_fsl_booke.S
@@ -17,6 +17,40 @@
#include <asm/cputable.h>
#include <asm/ppc_asm.h>
+_GLOBAL(__e500_icache_setup)
+ mfspr r0, SPRN_L1CSR1
+ andi. r3, r0, L1CSR1_ICE
+ bnelr /* Already enabled */
+ oris r0, r0, l1csr1_...@h
+ ori r0, r0, (L1CSR1_ICFI | L1CSR1_ICLFR | L1CSR1_ICE)
+ mtspr SPRN_L1CSR1, r0 /* Enable I-Cache */
+ isync
+ blr
+
+_GLOBAL(__e500_dcache_setup)
+ mfspr r0, SPRN_L1CSR0
+ andi. r3, r0, L1CSR0_DCE
+ bnelr /* Already enabled */
+ msync
+ isync
+ li r0, 0
+ mtspr SPRN_L1CSR0, r0 /* Disable */
+ msync
+ isync
+ li r0, (L1CSR0_DCFI | L1CSR0_CLFC)
+ mtspr SPRN_L1CSR0, r0 /* Invalidate */
+ isync
+1: mfspr r0, SPRN_L1CSR0
+ andi. r3, r0, L1CSR0_CLFC
+ bne+ 1b /* Wait for lock bits reset */
+ oris r0, r0, l1csr0_...@h
+ ori r0, r0, L1CSR0_DCE
+ msync
+ isync
+ mtspr SPRN_L1CSR0, r0 /* Enable */
+ isync
+ blr
+
_GLOBAL(__setup_cpu_e200)
/* enable dedicated debug exception handling resources (Debug APU) */
mfspr r3,SPRN_HID0
@@ -25,7 +59,16 @@ _GLOBAL(__setup_cpu_e200)
b __setup_e200_ivors
_GLOBAL(__setup_cpu_e500v1)
_GLOBAL(__setup_cpu_e500v2)
- b __setup_e500_ivors
+ mflr r4
+ bl __e500_icache_setup
+ bl __e500_dcache_setup
+ bl __setup_e500_ivors
+ mtlr r4
+ blr
_GLOBAL(__setup_cpu_e500mc)
- b __setup_e500mc_ivors
-
+ mflr r4
+ bl __e500_icache_setup
+ bl __e500_dcache_setup
+ bl __setup_e500mc_ivors
+ mtlr r4
+ blr
--
1.6.0.2
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