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>

diff --git a/arch/powerpc/cpu/mpc85xx/cmd_errata.c b/arch/powerpc/cpu/mpc85xx/cmd_errata.c
index 422782c..a7ed877 100644 (file)
--- 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_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 0990141..3c8f59c 100644 (file)
--- 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 6b1d3c4..1d46b14 100644 (file)
--- 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