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Date: Mon, 10 Aug 2015 11:52:08 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: mingo@...nel.org
Cc: tglx@...utronix.de, linux-kernel@...r.kernel.org,
Viresh Kumar <viresh.kumar@...aro.org>,
Kukjin Kim <kgene.kim@...sung.com>,
Kukjin Kim <kgene@...nel.org>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
linux-arm-kernel@...ts.infradead.org (moderated list:ARM/SAMSUNG
EXYNO...),
linux-samsung-soc@...r.kernel.org (moderated list:ARM/SAMSUNG EXYNO...)
Subject: [PATCH 51/74] clockevents/drivers/exynos_mct: Migrate to new 'set-state' interface
From: Viresh Kumar <viresh.kumar@...aro.org>
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@...sung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
drivers/clocksource/exynos_mct.c | 85 +++++++++++++++++++---------------------
1 file changed, 40 insertions(+), 45 deletions(-)
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 4d2330a..029f96a 100644
--- a/drivers/clocksource/exynos_mct.c
+++ b/drivers/clocksource/exynos_mct.c
@@ -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)
{
- unsigned long cycles_per_jiffy;
exynos4_mct_comp0_stop();
+ return 0;
+}
- 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;
+static int mct_set_state_periodic(struct clock_event_device *evt)
+{
+ unsigned long cycles_per_jiffy;
- case CLOCK_EVT_MODE_ONESHOT:
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_RESUME:
- break;
- }
+ cycles_per_jiffy = (((unsigned long long)NSEC_PER_SEC / HZ * evt->mult)
+ >> evt->shift);
+ exynos4_mct_comp0_stop();
+ 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);
--
1.9.1
--
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