Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-26 04:42:12 +00:00
Code Issues Packages Projects Releases Wiki Activity

microblaze: Register timecounter/cyclecounter

Browse Source 
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>
This commit is contained in:
Michal Simek 2009-11-06 12:31:00 +01:00
parent 24b45a12c2
commit 519e9f4173
1 changed files with 28 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
arch/microblaze/kernel/timer.c
View File

@ -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;
}