Erratum A-005812 Incorrect reservation clearing in Write Shadow mode can
result in invalid atomic operations. For u-boot, this erratum only impacts
SoCs running in write shadow mode.
Signed-off-by: York Sun <york...@freescale.com>
---
arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 +++
arch/powerpc/cpu/mpc85xx/cpu_init.c | 8 ++++++++
arch/powerpc/cpu/mpc85xx/release.S | 15 +++++++++++++++
arch/powerpc/include/asm/config_mpc85xx.h | 3 +++
4 files changed, 29 insertions(+)
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 422782c..7db06ac 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -258,6 +258,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
#ifdef CONFIG_SYS_FSL_ERRATUM_USB14
puts("Work-around for Erratum USB14 enabled\n");
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A005812
+ puts("Work-around for Erratum A-005812 enabled\n");
+#endif
return 0;
}
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c
b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index fd19d99..ca799ac 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -412,6 +412,14 @@ int cpu_init_r(void)
sync();
}
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A005812
+ /*
+ * A-005812 workaround sets bit 32 of SPR 976 for SoCs running
+ * in write shadow mode. Checking DCWS before setting SPR 976.
+ */
+ if (mfspr(L1CSR2) & L1CSR2_DCWS)
+ mtspr(SPRN_HDBCR0, (mfspr(SPRN_HDBCR0) | 0x80000000));
+#endif
#if defined(CONFIG_PPC_SPINTABLE_COMPATIBLE) && defined(CONFIG_MP)
spin = getenv("spin_table_compat");
diff --git a/arch/powerpc/cpu/mpc85xx/release.S
b/arch/powerpc/cpu/mpc85xx/release.S
index a4a21b0..6af2efd 100644
--- a/arch/powerpc/cpu/mpc85xx/release.S
+++ b/arch/powerpc/cpu/mpc85xx/release.S
@@ -242,6 +242,21 @@ __secondary_start_page:
2:
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A005812
+ /*
+ * A-005812 workaround sets bit 32 of SPR 976 for SoCs running in
+ * write shadow mode. This code should run after other code setting
+ * DCWS.
+ */
+ mfspr r3,L1CSR2
+ andis. r3,r3,(L1CSR2_DCWS)@h
+ beq 1f
+ mfspr r3, SPRN_HDBCR0
+ oris r3, r3, 0x8000
+ mtspr SPRN_HDBCR0, r3
+1:
+#endif
+
#ifdef CONFIG_BACKSIDE_L2_CACHE
/* skip L2 setup on P2040/P2040E as they have no L2 */
mfspr r3,SPRN_SVR
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h
b/arch/powerpc/include/asm/config_mpc85xx.h
index 057402b..9370a89 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -383,6 +383,7 @@
#define CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY 0xf0000000
#define CONFIG_SYS_FSL_ERRATUM_SRIO_A004034
#define CONFIG_SYS_FSL_ERRATUM_A004849
+#define CONFIG_SYS_FSL_ERRATUM_A005812
#elif defined(CONFIG_PPC_P4080) /* also supports P4040 */
#define CONFIG_SYS_FSL_QORIQ_CHASSIS1
@@ -429,6 +430,7 @@
#define CONFIG_SYS_FSL_ERRATUM_A004849
#define CONFIG_SYS_FSL_ERRATUM_A004580
#define CONFIG_SYS_P4080_ERRATUM_PCIE_A003
+#define CONFIG_SYS_FSL_ERRATUM_A005812
#elif defined(CONFIG_PPC_P5020) /* also supports P5010 */
#define CONFIG_SYS_PPC64 /* 64-bit core */
@@ -491,6 +493,7 @@
#define CONFIG_SYS_FSL_ERRATUM_A004510
#define CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV 0x10
#define CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY 0xf0000000
+#define CONFIG_SYS_FSL_ERRATUM_A005812
#elif defined(CONFIG_BSC9131)
#define CONFIG_MAX_CPUS 1
--
1.7.9.5
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