linux-kernel - [PATCH 38/74] clockevents/drivers/atmel: Migrate to new 'set-state' interface

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Date:	Mon, 10 Aug 2015 11:51:55 +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>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Subject: [PATCH 38/74] clockevents/drivers/atmel: Migrate to new 'set-state' interface

From: Viresh Kumar <viresh.kumar@...aro.org>

Migrate atmel 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: Nicolas Ferre <nicolas.ferre@...el.com>
Cc: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
---
 drivers/clocksource/timer-atmel-pit.c | 41 +++++++++++++++--------------------
 1 file changed, 18 insertions(+), 23 deletions(-)

diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c
index c0304ff..5875322 100644
--- a/drivers/clocksource/timer-atmel-pit.c
+++ b/drivers/clocksource/timer-atmel-pit.c
@@ -90,33 +90,27 @@ static cycle_t read_pit_clk(struct clocksource *cs)
 	return elapsed;
 }
 
+static int pit_clkevt_shutdown(struct clock_event_device *dev)
+{
+	struct pit_data *data = clkevt_to_pit_data(dev);
+
+	/* disable irq, leaving the clocksource active */
+	pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN);
+	return 0;
+}
+
 /*
  * Clockevent device:  interrupts every 1/HZ (== pit_cycles * MCK/16)
  */
-static void
-pit_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
+static int pit_clkevt_set_periodic(struct clock_event_device *dev)
 {
 	struct pit_data *data = clkevt_to_pit_data(dev);
 
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		/* update clocksource counter */
-		data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
-		pit_write(data->base, AT91_PIT_MR,
-			  (data->cycle - 1) | AT91_PIT_PITEN | AT91_PIT_PITIEN);
-		break;
-	case CLOCK_EVT_MODE_ONESHOT:
-		BUG();
-		/* FALLTHROUGH */
-	case CLOCK_EVT_MODE_SHUTDOWN:
-	case CLOCK_EVT_MODE_UNUSED:
-		/* disable irq, leaving the clocksource active */
-		pit_write(data->base, AT91_PIT_MR,
-			  (data->cycle - 1) | AT91_PIT_PITEN);
-		break;
-	case CLOCK_EVT_MODE_RESUME:
-		break;
-	}
+	/* update clocksource counter */
+	data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
+	pit_write(data->base, AT91_PIT_MR,
+		  (data->cycle - 1) | AT91_PIT_PITEN | AT91_PIT_PITIEN);
+	return 0;
 }
 
 static void at91sam926x_pit_suspend(struct clock_event_device *cedev)
@@ -162,7 +156,7 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)
 	WARN_ON_ONCE(!irqs_disabled());
 
 	/* The PIT interrupt may be disabled, and is shared */
-	if ((data->clkevt.mode == CLOCK_EVT_MODE_PERIODIC) &&
+	if (clockevent_state_periodic(&data->clkevt) &&
 	    (pit_read(data->base, AT91_PIT_SR) & AT91_PIT_PITS)) {
 		unsigned nr_ticks;
 
@@ -227,7 +221,8 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data)
 	data->clkevt.rating = 100;
 	data->clkevt.cpumask = cpumask_of(0);
 
-	data->clkevt.set_mode = pit_clkevt_mode;
+	data->clkevt.set_state_shutdown = pit_clkevt_shutdown;
+	data->clkevt.set_state_periodic = pit_clkevt_set_periodic;
 	data->clkevt.resume = at91sam926x_pit_resume;
 	data->clkevt.suspend = at91sam926x_pit_suspend;
 	clockevents_register_device(&data->clkevt);
-- 
1.9.1

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