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/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 0990141..3c8f59c 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -172,6 +172,9 @@
#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 */