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Commit 519e9f41 authored by Michal Simek's avatar Michal Simek
Browse files

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: default avatarMichal Simek <monstr@monstr.eu>
parent 24b45a12

arch/microblaze/kernel/timer.c

+28 −0
Original line number Diff line number Diff line
@@ -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;

}