powerpc/fsl-booke: Enable L1 cache on e500v1/e500v2/e500mc CPUs

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 <ncase@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

diff --git a/arch/powerpc/include/asm/reg_booke.h b/arch/powerpc/include/asm/reg_booke.h
index 601ddbc..6bcf364 100644 (file)
--- 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 (file)
--- 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_CPE@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_CPE@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