redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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

Migrate exynos_mct 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: Kukjin Kim <kgene.kim@samsung.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 2015-06-18 16:24:20 +05:30 committed by Daniel Lezcano
parent cf4541c101
commit 79e436d3a7
1 changed files with 41 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
drivers/clocksource/exynos_mct.c
View File

@ -257,15 +257,14 @@ static void exynos4_mct_comp0_stop(void)
exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB);
}
static void exynos4_mct_comp0_start(enum clock_event_mode mode,
unsigned long cycles)
static void exynos4_mct_comp0_start(bool periodic, unsigned long cycles)
{
unsigned int tcon;
cycle_t comp_cycle;
tcon = readl_relaxed(reg_base + EXYNOS4_MCT_G_TCON);
if (mode == CLOCK_EVT_MODE_PERIODIC) {
if (periodic) {
tcon |= MCT_G_TCON_COMP0_AUTO_INC;
exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR);
}
@ -283,38 +282,38 @@ static void exynos4_mct_comp0_start(enum clock_event_mode mode,
static int exynos4_comp_set_next_event(unsigned long cycles,
struct clock_event_device *evt)
{
exynos4_mct_comp0_start(evt->mode, cycles);
exynos4_mct_comp0_start(false, cycles);
return 0;
}
static void exynos4_comp_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
static int mct_set_state_shutdown(struct clock_event_device *evt)
{
exynos4_mct_comp0_stop();
return 0;
}
static int mct_set_state_periodic(struct clock_event_device *evt)
{
unsigned long cycles_per_jiffy;
cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
>> evt->shift);
exynos4_mct_comp0_stop();
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
cycles_per_jiffy =
(((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift);
exynos4_mct_comp0_start(mode, cycles_per_jiffy);
break;
case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_RESUME:
break;
}
exynos4_mct_comp0_start(true, cycles_per_jiffy);
return 0;
}
static struct clock_event_device mct_comp_device = {
.name = "mct-comp",
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.rating = 250,
.set_next_event = exynos4_comp_set_next_event,
.set_mode = exynos4_comp_set_mode,
.name = "mct-comp",
.features = CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.rating = 250,
.set_next_event = exynos4_comp_set_next_event,
.set_state_periodic = mct_set_state_periodic,
.set_state_shutdown = mct_set_state_shutdown,
.set_state_oneshot = mct_set_state_shutdown,
.tick_resume = mct_set_state_shutdown,
};
static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id)
@ -390,39 +389,32 @@ static int exynos4_tick_set_next_event(unsigned long cycles,
return 0;
}
static inline void exynos4_tick_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
static int set_state_shutdown(struct clock_event_device *evt)
{
exynos4_mct_tick_stop(this_cpu_ptr(&percpu_mct_tick));
return 0;
}
static int set_state_periodic(struct clock_event_device *evt)
{
struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
unsigned long cycles_per_jiffy;
cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
>> evt->shift);
exynos4_mct_tick_stop(mevt);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
cycles_per_jiffy =
(((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift);
exynos4_mct_tick_start(cycles_per_jiffy, mevt);
break;
case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_RESUME:
break;
}
exynos4_mct_tick_start(cycles_per_jiffy, mevt);
return 0;
}
static void exynos4_mct_tick_clear(struct mct_clock_event_device *mevt)
{
struct clock_event_device *evt = &mevt->evt;
/*
* This is for supporting oneshot mode.
* Mct would generate interrupt periodically
* without explicit stopping.
*/
if (evt->mode != CLOCK_EVT_MODE_PERIODIC)
if (!clockevent_state_periodic(&mevt->evt))
exynos4_mct_tick_stop(mevt);
/* Clear the MCT tick interrupt */
@ -453,7 +445,10 @@ static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
evt->name = mevt->name;
evt->cpumask = cpumask_of(cpu);
evt->set_next_event = exynos4_tick_set_next_event;
evt->set_mode = exynos4_tick_set_mode;
evt->set_state_periodic = set_state_periodic;
evt->set_state_shutdown = set_state_shutdown;
evt->set_state_oneshot = set_state_shutdown;
evt->tick_resume = set_state_shutdown;
evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
evt->rating = 450;
@ -479,7 +474,7 @@ static void exynos4_local_timer_stop(struct mct_clock_event_device *mevt)
{
struct clock_event_device *evt = &mevt->evt;
evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
evt->set_state_shutdown(evt);
if (mct_int_type == MCT_INT_SPI) {
if (evt->irq != -1)
disable_irq_nosync(evt->irq);