[U-Boot] [PATCH 3/4] powerpc/p4080: Add workaround for erratum CPU22

[Kumar Gala <galak@kernel.crashing.org>]

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
 arch/powerpc/cpu/mpc85xx/cmd_errata.c |    4 +++-
 arch/powerpc/cpu/mpc85xx/cpu_init.c   |    7 +++++++
 arch/powerpc/cpu/mpc85xx/release.S    |    6 ++++++
 arch/powerpc/include/asm/processor.h  |    1 +
 4 files changed, 17 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 01c462c..d73f3d7 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -44,7 +44,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 #if defined(CONFIG_SYS_P4080_ERRATUM_SERDES8)
 	puts("Work-around for Erratum SERDES8 enabled\n");
 #endif
-
+#if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
+	puts("Work-around for Erratum CPU22 enabled\n");
+#endif
 	return 0;
 }
 
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index a90ebb1..2c3be6d 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -32,6 +32,7 @@
 #include <ioports.h>
 #include <sata.h>
 #include <asm/io.h>
+#include <asm/cache.h>
 #include <asm/mmu.h>
 #include <asm/fsl_law.h>
 #include <asm/fsl_serdes.h>
@@ -245,6 +246,12 @@ int cpu_init_r(void)
 	volatile fsl_lbc_t *lbc = LBC_BASE_ADDR;
 #endif
 
+#if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
+	flush_dcache();
+	mtspr(L1CSR2, (mfspr(L1CSR2) | L1CSR2_DCWS));
+	sync();
+#endif
+
 	puts ("L2:    ");
 
 #if defined(CONFIG_L2_CACHE)
diff --git a/arch/powerpc/cpu/mpc85xx/release.S b/arch/powerpc/cpu/mpc85xx/release.S
index 0b5b9da..53cefaf 100644
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -136,6 +136,12 @@ __secondary_start_page:
 	mtspr	L1CSR2,r8
 #endif
 
+#if defined(CONFIG_SYS_P4080_ERRATUM_CPU22)
+	mfspr	r8,L1CSR2
+	oris	r8,r8,(L1CSR2_DCWS)@h
+	mtspr	L1CSR2,r8
+#endif
+
 #ifdef CONFIG_BACKSIDE_L2_CACHE
 	/* Enable/invalidate the L2 cache */
 	msync
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index 89f283a..84a1e2e 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -495,6 +495,7 @@
 #define   L1CSR1_ICFI		0x00000002	/* Instruction Cache Flash Invalidate */
 #define   L1CSR1_ICE		0x00000001	/* Instruction Cache Enable */
 #define SPRN_L1CSR2	0x25e	/* L1 Data Cache Control and Status Register 2 */
+#define   L1CSR2_DCWS		0x40000000	/* Data Cache Write Shadow */
 #define SPRN_L2CSR0	0x3f9	/* L2 Data Cache Control and Status Register 0 */
 #define   L2CSR0_L2E		0x80000000	/* L2 Cache Enable */
 #define   L2CSR0_L2PE		0x40000000	/* L2 Cache Parity/ECC Enable */
-- 
1.6.0.6