diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/pasemi/setup.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c index ffe6528048b..05def6282f8 100644 --- a/arch/powerpc/platforms/pasemi/setup.c +++ b/arch/powerpc/platforms/pasemi/setup.c @@ -50,26 +50,30 @@ static void pas_restart(char *cmd) #ifdef CONFIG_SMP static DEFINE_SPINLOCK(timebase_lock); +static unsigned long timebase; static void __devinit pas_give_timebase(void) { - unsigned long tb; - spin_lock(&timebase_lock); mtspr(SPRN_TBCTL, TBCTL_FREEZE); - tb = mftb(); - mtspr(SPRN_TBCTL, TBCTL_UPDATE_LOWER | (tb & 0xffffffff)); - mtspr(SPRN_TBCTL, TBCTL_UPDATE_UPPER | (tb >> 32)); - mtspr(SPRN_TBCTL, TBCTL_RESTART); + isync(); + timebase = get_tb(); spin_unlock(&timebase_lock); - pr_debug("pas_give_timebase: cpu %d gave tb %lx\n", - smp_processor_id(), tb); + + while (timebase) + barrier(); + mtspr(SPRN_TBCTL, TBCTL_RESTART); } static void __devinit pas_take_timebase(void) { - pr_debug("pas_take_timebase: cpu %d has tb %lx\n", - smp_processor_id(), mftb()); + while (!timebase) + smp_rmb(); + + spin_lock(&timebase_lock); + set_tb(timebase >> 32, timebase & 0xffffffff); + timebase = 0; + spin_unlock(&timebase_lock); } struct smp_ops_t pas_smp_ops = { |