From c388cfebbf22acd2b6adf757b35e28d4be66ac7c Mon Sep 17 00:00:00 2001 From: Olof Johansson Date: Sun, 4 Feb 2007 16:36:53 -0600 Subject: [POWERPC] pasemi: SMP timebase sync Timebase update is simple on PA6T, since global updates can be done from one core by writing to an SPR. Signed-off-by: Olof Johansson Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/pasemi/setup.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) (limited to 'arch/powerpc/platforms') diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c index cabf7017c05e..2d9652b6acb3 100644 --- a/arch/powerpc/platforms/pasemi/setup.c +++ b/arch/powerpc/platforms/pasemi/setup.c @@ -48,13 +48,36 @@ static void pas_restart(char *cmd) } #ifdef CONFIG_SMP +static DEFINE_SPINLOCK(timebase_lock); + +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); + spin_unlock(&timebase_lock); + pr_debug("pas_give_timebase: cpu %d gave tb %lx\n", + smp_processor_id(), tb); +} + +static void __devinit pas_take_timebase(void) +{ + pr_debug("pas_take_timebase: cpu %d has tb %lx\n", + smp_processor_id(), mftb()); +} + struct smp_ops_t pas_smp_ops = { .probe = smp_mpic_probe, .message_pass = smp_mpic_message_pass, .kick_cpu = smp_generic_kick_cpu, .setup_cpu = smp_mpic_setup_cpu, - .give_timebase = smp_generic_give_timebase, - .take_timebase = smp_generic_take_timebase, + .give_timebase = pas_give_timebase, + .take_timebase = pas_take_timebase, }; #endif /* CONFIG_SMP */ -- cgit v1.2.2