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authorKumar Gala <galak@kernel.crashing.org>2010-05-05 22:35:27 -0500
committerKumar Gala <galak@kernel.crashing.org>2010-07-26 13:07:57 -0500
commitfd3c9befa83eecf6e7c6ef03c501159fbf754143 (patch)
tree825bcfea93aea0ed8d270bd993262bab45982981
parent61054ffa1690b2aef4e845c6aa071840b93abff6 (diff)
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powerpc/p4080: Add workaround for erratum CPU22
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
-rw-r--r--arch/powerpc/cpu/mpc85xx/cmd_errata.c4
-rw-r--r--arch/powerpc/cpu/mpc85xx/cpu_init.c7
-rw-r--r--arch/powerpc/cpu/mpc85xx/release.S6
-rw-r--r--arch/powerpc/include/asm/processor.h1
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 */