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authorMichal Simek <monstr@monstr.eu>2009-11-06 12:31:00 +0100
committerMichal Simek <monstr@monstr.eu>2009-12-14 08:40:09 +0100
commit519e9f417388ba055b7604db5f4f492f7c84f427 (patch)
tree0dc1f78f1911d342d2b10fd085a01cbaa45217b6
parent24b45a12c21132e78e14f3aedf74bb1297228072 (diff)
microblaze: Register timecounter/cyclecounter
It is the same counter as we use as free running one. I would like to use it for ftrace. Signed-off-by: Michal Simek <monstr@monstr.eu>
-rw-r--r--arch/microblaze/kernel/timer.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index 5499deae7fa..ed61b2f1771 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -183,6 +183,31 @@ static cycle_t microblaze_read(struct clocksource *cs)
return (cycle_t) (in_be32(TIMER_BASE + TCR1));
}
+static struct timecounter microblaze_tc = {
+ .cc = NULL,
+};
+
+static cycle_t microblaze_cc_read(const struct cyclecounter *cc)
+{
+ return microblaze_read(NULL);
+}
+
+static struct cyclecounter microblaze_cc = {
+ .read = microblaze_cc_read,
+ .mask = CLOCKSOURCE_MASK(32),
+ .shift = 24,
+};
+
+int __init init_microblaze_timecounter(void)
+{
+ microblaze_cc.mult = div_sc(cpuinfo.cpu_clock_freq, NSEC_PER_SEC,
+ microblaze_cc.shift);
+
+ timecounter_init(&microblaze_tc, &microblaze_cc, sched_clock());
+
+ return 0;
+}
+
static struct clocksource clocksource_microblaze = {
.name = "microblaze_clocksource",
.rating = 300,
@@ -204,6 +229,9 @@ static int __init microblaze_clocksource_init(void)
out_be32(TIMER_BASE + TCSR1, in_be32(TIMER_BASE + TCSR1) & ~TCSR_ENT);
/* start timer1 - up counting without interrupt */
out_be32(TIMER_BASE + TCSR1, TCSR_TINT|TCSR_ENT|TCSR_ARHT);
+
+ /* register timecounter - for ftrace support */
+ init_microblaze_timecounter();
return 0;
}