From 8212519254bc3ea94d959f56f10061849aa07b26 Mon Sep 17 00:00:00 2001
From: Scott Wood <scottwood@freescale.com>
Date: Wed, 15 May 2013 17:50:13 -0500
Subject: [PATCH] powerpc/mpc85xx: work around erratum A-006593
Erratum A-006593 is "Atomic store may report failure but still allow
the store data to be visible".
The workaround is: "Set CoreNet Platform Cache register CPCHDBCR0 bit
21 to 1'b1. This may have a small impact on synthetic write bandwidth
benchmarks but should have a negligible impact on real code."
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
---
arch/powerpc/cpu/mpc85xx/cmd_errata.c | 3 +++
arch/powerpc/cpu/mpc85xx/cpu_init.c | 3 +++
arch/powerpc/include/asm/config_mpc85xx.h | 2 ++
3 files changed, 8 insertions(+)
diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 422782ca8f..a7ed87769e 100644
--- a/arch/powerpc/cpu/mpc85xx/cmd_errata.c
+++ b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
@@ -257,6 +257,9 @@ static int do_errata(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
#endif
#ifdef CONFIG_SYS_FSL_ERRATUM_USB14
puts("Work-around for Erratum USB14 enabled\n");
+#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A006593
+ puts("Work-around for Erratum A006593 enabled\n");
#endif
return 0;
}
diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 0990141981..3c8f59cdb3 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -172,6 +172,9 @@ static void enable_cpc(void)
#ifdef CONFIG_SYS_FSL_ERRATUM_CPC_A003
setbits_be32(&cpc->cpchdbcr0, CPC_HDBCR0_DATA_ECC_SCRUB_DIS);
#endif
+#ifdef CONFIG_SYS_FSL_ERRATUM_A006593
+ setbits_be32(&cpc->cpchdbcr0, 1 << (31 - 21));
+#endif
out_be32(&cpc->cpccsr0, CPC_CSR0_CE | CPC_CSR0_PE);
/* Read back to sync write */
diff --git a/arch/powerpc/include/asm/config_mpc85xx.h b/arch/powerpc/include/asm/config_mpc85xx.h
index 6b1d3c4baf..1d46b14230 100644
--- a/arch/powerpc/include/asm/config_mpc85xx.h
+++ b/arch/powerpc/include/asm/config_mpc85xx.h
@@ -555,6 +555,7 @@
#define CONFIG_SYS_FSL_ERRATUM_A004468
#define CONFIG_SYS_FSL_ERRATUM_A_004934
#define CONFIG_SYS_FSL_ERRATUM_A005871
+#define CONFIG_SYS_FSL_ERRATUM_A006593
#define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000
#define CONFIG_SYS_FSL_PCI_VER_3_X
@@ -576,6 +577,7 @@
#define CONFIG_SYS_FSL_USB1_PHY_ENABLE
#define CONFIG_SYS_FSL_ERRATUM_A_004934
#define CONFIG_SYS_FSL_ERRATUM_A005871
+#define CONFIG_SYS_FSL_ERRATUM_A006593
#define CONFIG_SYS_CCSRBAR_DEFAULT 0xfe000000
#ifdef CONFIG_PPC_B4860
--
2.39.5