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xtensa/time: Migrate to new 'set-state' interface 

Migrate xtensa driver to the new 'set-state' interface provided by
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.

Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: linux-xtensa@linux-xtensa.org
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Viresh Kumar 2015-07-16 16:56:33 +05:30 committed by Daniel Lezcano
parent 3078c8df2c
commit 8e40fc4b78
1 changed files with 26 additions and 27 deletions
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53
arch/xtensa/kernel/time.c
View File

@ -52,8 +52,6 @@ static struct clocksource ccount_clocksource = {
static int ccount_timer_set_next_event(unsigned long delta,
struct clock_event_device *dev);
static void ccount_timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt);
struct ccount_timer {
struct clock_event_device evt;
int irq_enabled;
@ -77,35 +75,34 @@ static int ccount_timer_set_next_event(unsigned long delta,
return ret;
}
static void ccount_timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
/*
* There is no way to disable the timer interrupt at the device level,
* only at the intenable register itself. Since enable_irq/disable_irq
* calls are nested, we need to make sure that these calls are
* balanced.
*/
static int ccount_timer_shutdown(struct clock_event_device *evt)
{
struct ccount_timer *timer =
container_of(evt, struct ccount_timer, evt);
/*
* There is no way to disable the timer interrupt at the device level,
* only at the intenable register itself. Since enable_irq/disable_irq
* calls are nested, we need to make sure that these calls are
* balanced.
*/
switch (mode) {
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
if (timer->irq_enabled) {
disable_irq(evt->irq);
timer->irq_enabled = 0;
}
break;
case CLOCK_EVT_MODE_RESUME:
case CLOCK_EVT_MODE_ONESHOT:
if (!timer->irq_enabled) {
enable_irq(evt->irq);
timer->irq_enabled = 1;
}
default:
break;
if (timer->irq_enabled) {
disable_irq(evt->irq);
timer->irq_enabled = 0;
}
return 0;
}
static int ccount_timer_set_oneshot(struct clock_event_device *evt)
{
struct ccount_timer *timer =
container_of(evt, struct ccount_timer, evt);
if (!timer->irq_enabled) {
enable_irq(evt->irq);
timer->irq_enabled = 1;
}
return 0;
}
static irqreturn_t timer_interrupt(int irq, void *dev_id);
@ -126,7 +123,9 @@ void local_timer_setup(unsigned cpu)
clockevent->features = CLOCK_EVT_FEAT_ONESHOT;
clockevent->rating = 300;
clockevent->set_next_event = ccount_timer_set_next_event;
clockevent->set_mode = ccount_timer_set_mode;
clockevent->set_state_shutdown = ccount_timer_shutdown;
clockevent->set_state_oneshot = ccount_timer_set_oneshot;
clockevent->tick_resume = ccount_timer_set_oneshot;
clockevent->cpumask = cpumask_of(cpu);
clockevent->irq = irq_create_mapping(NULL, LINUX_TIMER_INT);
if (WARN(!clockevent->irq, "error: can't map timer irq"))