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clockevents/drivers/em_sti: Migrate to new 'set-state' interface 

Migrate em_sti driver to the new 'set-state' interface provided by
the clockevents core, the earlier 'set-mode' interface is marked
obsolete now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

NOTE: This also drops a special check:

	if (old_mode == CLOCK_EVT_MODE_ONESHOT)
		em_sti_stop(p, USER_CLOCKEVENT);

as it doesn't look like that important. This driver only supports
ONESHOT and we can only move only to SHUTDOWN from ONESHOT and.
Also on second call (on shutdown), em_sti_stop() would return without
disabling the device again.

Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
hifive-unleashed-5.1
Viresh Kumar 2015-06-12 13:30:17 +05:30 committed by Daniel Lezcano
parent 8f9327cbb6
commit 75f940615a
1 changed files with 15 additions and 26 deletions
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41
drivers/clocksource/em_sti.c
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@ -251,33 +251,21 @@ static struct em_sti_priv *ced_to_em_sti(struct clock_event_device *ced)
return container_of(ced, struct em_sti_priv, ced);
}
static void em_sti_clock_event_mode(enum clock_event_mode mode,
struct clock_event_device *ced)
static int em_sti_clock_event_shutdown(struct clock_event_device *ced)
{
struct em_sti_priv *p = ced_to_em_sti(ced);
em_sti_stop(p, USER_CLOCKEVENT);
return 0;
}
static int em_sti_clock_event_set_oneshot(struct clock_event_device *ced)
{
struct em_sti_priv *p = ced_to_em_sti(ced);
/* deal with old setting first */
switch (ced->mode) {
case CLOCK_EVT_MODE_ONESHOT:
em_sti_stop(p, USER_CLOCKEVENT);
break;
default:
break;
}
switch (mode) {
case CLOCK_EVT_MODE_ONESHOT:
dev_info(&p->pdev->dev, "used for oneshot clock events\n");
em_sti_start(p, USER_CLOCKEVENT);
clockevents_config(&p->ced, p->rate);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
em_sti_stop(p, USER_CLOCKEVENT);
break;
default:
break;
}
dev_info(&p->pdev->dev, "used for oneshot clock events\n");
em_sti_start(p, USER_CLOCKEVENT);
clockevents_config(&p->ced, p->rate);
return 0;
}
static int em_sti_clock_event_next(unsigned long delta,
@ -303,11 +291,12 @@ static void em_sti_register_clockevent(struct em_sti_priv *p)
ced->rating = 200;
ced->cpumask = cpu_possible_mask;
ced->set_next_event = em_sti_clock_event_next;
ced->set_mode = em_sti_clock_event_mode;
ced->set_state_shutdown = em_sti_clock_event_shutdown;
ced->set_state_oneshot = em_sti_clock_event_set_oneshot;
dev_info(&p->pdev->dev, "used for clock events\n");
/* Register with dummy 1 Hz value, gets updated in ->set_mode() */
/* Register with dummy 1 Hz value, gets updated in ->set_state_oneshot() */
clockevents_config_and_register(ced, 1, 2, 0xffffffff);
}