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-rw-r--r--arch/powerpc/cpu/mpc85xx/mp.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/mp.c b/arch/powerpc/cpu/mpc85xx/mp.c
index 6c0da83..758e6d7 100644
--- a/arch/powerpc/cpu/mpc85xx/mp.c
+++ b/arch/powerpc/cpu/mpc85xx/mp.c
@@ -276,8 +276,13 @@ static void plat_mp_up(unsigned long bootpg)
/* enable time base at the platform */
out_be32(&rcpm->ctbenrl, 0);
+
+ /* readback to sync write */
+ in_be32(&rcpm->ctbenrl);
+
mtspr(SPRN_TBWU, 0);
mtspr(SPRN_TBWL, 0);
+
out_be32(&rcpm->ctbenrl, (1 << nr_cpus) - 1);
#ifdef CONFIG_MPC8xxx_DISABLE_BPTR
@@ -347,6 +352,10 @@ static void plat_mp_up(unsigned long bootpg)
else
devdisr |= MPC85xx_DEVDISR_TB0;
out_be32(&gur->devdisr, devdisr);
+
+ /* readback to sync write */
+ in_be32(&gur->devdisr);
+
mtspr(SPRN_TBWU, 0);
mtspr(SPRN_TBWL, 0);