[PATCH -next] powerpc/fsl-booke: Enable L1 cache on e500v1/e500v2/e500mc CPUs

[PATCH -next] powerpc/fsl-booke: Enable L1 cache on e500v1/e500v2/e500mc CPUs

[Nate Case]

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>
---
 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_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
-- 
1.6.0.2

Re: [PATCH -next] powerpc/fsl-booke: Enable L1 cache on e500v1/e500v2/e500mc CPUs

[Kumar Gala]

On Jun 10, 2009, at 3:37 PM, Nate Case wrote:

> 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>
> ---
> arch/powerpc/include/asm/reg_booke.h      |    2 +
> arch/powerpc/kernel/cpu_setup_fsl_booke.S |   49 ++++++++++++++++++++ 
> +++++++--
> 2 files changed, 48 insertions(+), 3 deletions(-)

applied to next

- k