diff options
| author | Olof Johansson <olof@lixom.net> | 2007-02-04 16:36:53 -0600 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-02-07 14:03:22 +1100 |
| commit | c388cfebbf22acd2b6adf757b35e28d4be66ac7c (patch) | |
| tree | dc367aa9c8dd94dddefad9062bf43ac16dcd1ea6 /arch | |
| parent | f620be99e9355c41693f0c748ba9260f69278ee0 (diff) | |
| download | blackbird-op-linux-c388cfebbf22acd2b6adf757b35e28d4be66ac7c.tar.gz blackbird-op-linux-c388cfebbf22acd2b6adf757b35e28d4be66ac7c.zip | |
[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 <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/pasemi/setup.c | 27 |
1 files changed, 25 insertions, 2 deletions
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 */ |
