diff options
author | Olof Johansson <olof@lixom.net> | 2007-02-04 17:36:53 -0500 |
---|---|---|
committer | Paul Mackerras <paulus@samba.org> | 2007-02-06 22:03:22 -0500 |
commit | c388cfebbf22acd2b6adf757b35e28d4be66ac7c (patch) | |
tree | dc367aa9c8dd94dddefad9062bf43ac16dcd1ea6 /arch/powerpc | |
parent | f620be99e9355c41693f0c748ba9260f69278ee0 (diff) |
[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/powerpc')
-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) | |||
48 | } | 48 | } |
49 | 49 | ||
50 | #ifdef CONFIG_SMP | 50 | #ifdef CONFIG_SMP |
51 | static DEFINE_SPINLOCK(timebase_lock); | ||
52 | |||
53 | static void __devinit pas_give_timebase(void) | ||
54 | { | ||
55 | unsigned long tb; | ||
56 | |||
57 | spin_lock(&timebase_lock); | ||
58 | mtspr(SPRN_TBCTL, TBCTL_FREEZE); | ||
59 | tb = mftb(); | ||
60 | mtspr(SPRN_TBCTL, TBCTL_UPDATE_LOWER | (tb & 0xffffffff)); | ||
61 | mtspr(SPRN_TBCTL, TBCTL_UPDATE_UPPER | (tb >> 32)); | ||
62 | mtspr(SPRN_TBCTL, TBCTL_RESTART); | ||
63 | spin_unlock(&timebase_lock); | ||
64 | pr_debug("pas_give_timebase: cpu %d gave tb %lx\n", | ||
65 | smp_processor_id(), tb); | ||
66 | } | ||
67 | |||
68 | static void __devinit pas_take_timebase(void) | ||
69 | { | ||
70 | pr_debug("pas_take_timebase: cpu %d has tb %lx\n", | ||
71 | smp_processor_id(), mftb()); | ||
72 | } | ||
73 | |||
51 | struct smp_ops_t pas_smp_ops = { | 74 | struct smp_ops_t pas_smp_ops = { |
52 | .probe = smp_mpic_probe, | 75 | .probe = smp_mpic_probe, |
53 | .message_pass = smp_mpic_message_pass, | 76 | .message_pass = smp_mpic_message_pass, |
54 | .kick_cpu = smp_generic_kick_cpu, | 77 | .kick_cpu = smp_generic_kick_cpu, |
55 | .setup_cpu = smp_mpic_setup_cpu, | 78 | .setup_cpu = smp_mpic_setup_cpu, |
56 | .give_timebase = smp_generic_give_timebase, | 79 | .give_timebase = pas_give_timebase, |
57 | .take_timebase = smp_generic_take_timebase, | 80 | .take_timebase = pas_take_timebase, |
58 | }; | 81 | }; |
59 | #endif /* CONFIG_SMP */ | 82 | #endif /* CONFIG_SMP */ |
60 | 83 | ||