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authorOlof Johansson <olof@lixom.net>2007-02-04 16:36:53 -0600
committerPaul Mackerras <paulus@samba.org>2007-02-07 14:03:22 +1100
commitc388cfebbf22acd2b6adf757b35e28d4be66ac7c (patch)
treedc367aa9c8dd94dddefad9062bf43ac16dcd1ea6
parentf620be99e9355c41693f0c748ba9260f69278ee0 (diff)
downloadlinux-linaro-stable-c388cfebbf22acd2b6adf757b35e28d4be66ac7c.tar.gz
[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>
-rw-r--r--arch/powerpc/platforms/pasemi/setup.c27
-rw-r--r--include/asm-powerpc/reg.h6
2 files changed, 31 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 */
diff --git a/include/asm-powerpc/reg.h b/include/asm-powerpc/reg.h
index 923df6ceaa5c..0d7f0164ed81 100644
--- a/include/asm-powerpc/reg.h
+++ b/include/asm-powerpc/reg.h
@@ -392,6 +392,12 @@
#define SPRN_HSRR0 0x13A /* Save/Restore Register 0 */
#define SPRN_HSRR1 0x13B /* Save/Restore Register 1 */
+#define SPRN_TBCTL 0x35f /* PA6T Timebase control register */
+#define TBCTL_FREEZE 0x0000000000000000ull /* Freeze all tbs */
+#define TBCTL_RESTART 0x0000000100000000ull /* Restart all tbs */
+#define TBCTL_UPDATE_UPPER 0x0000000200000000ull /* Set upper 32 bits */
+#define TBCTL_UPDATE_LOWER 0x0000000300000000ull /* Set lower 32 bits */
+
#ifndef SPRN_SVR
#define SPRN_SVR 0x11E /* System Version Register */
#endif