clockevents/drivers/u300: Migrate to new 'set-state' interface

Migrate u300 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: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/clocksource/timer-u300.c

@@ -187,46 +187,24 @@ struct u300_clockevent_data {
 	unsigned ticks_per_jiffy;
 };
 
-/*
- * The u300_set_mode() function is always called first, if we
- * have oneshot timer active, the oneshot scheduling function
- * u300_set_next_event() is called immediately after.
- */
-static void u300_set_mode(enum clock_event_mode mode,
-			  struct clock_event_device *evt)
+static int u300_shutdown(struct clock_event_device *evt)
 {
-	struct u300_clockevent_data *cevdata =
-		container_of(evt, struct u300_clockevent_data, cevd);
-
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		/* Disable interrupts on GPT1 */
+	/* Disable interrupts on GP1 */
 	writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
 	       u300_timer_base + U300_TIMER_APP_GPT1IE);
-		/* Disable GP1 while we're reprogramming it. */
+	/* Disable GP1 */
 	writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
 	       u300_timer_base + U300_TIMER_APP_DGPT1);
+	return 0;
+}
+
 /*
-		 * Set the periodic mode to a certain number of ticks per
-		 * jiffy.
+ * If we have oneshot timer active, the oneshot scheduling function
+ * u300_set_next_event() is called immediately after.
  */
-		writel(cevdata->ticks_per_jiffy,
-		       u300_timer_base + U300_TIMER_APP_GPT1TC);
-		/*
-		 * Set continuous mode, so the timer keeps triggering
-		 * interrupts.
-		 */
-		writel(U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS,
-		       u300_timer_base + U300_TIMER_APP_SGPT1M);
-		/* Enable timer interrupts */
-		writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
-		       u300_timer_base + U300_TIMER_APP_GPT1IE);
-		/* Then enable the OS timer again */
-		writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
-		       u300_timer_base + U300_TIMER_APP_EGPT1);
-		break;
-	case CLOCK_EVT_MODE_ONESHOT:
-		/* Just break; here? */
+static int u300_set_oneshot(struct clock_event_device *evt)
+{
+	/* Just return; here? */
 	/*
 	 * The actual event will be programmed by the next event hook,
 	 * so we just set a dummy value somewhere at the end of the
@@ -252,20 +230,39 @@ static void u300_set_mode(enum clock_event_mode mode,
 	/* Enable timer */
 	writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
 	       u300_timer_base + U300_TIMER_APP_EGPT1);
-		break;
-	case CLOCK_EVT_MODE_UNUSED:
-	case CLOCK_EVT_MODE_SHUTDOWN:
-		/* Disable interrupts on GP1 */
+	return 0;
+}
+
+static int u300_set_periodic(struct clock_event_device *evt)
+{
+	struct u300_clockevent_data *cevdata =
+		container_of(evt, struct u300_clockevent_data, cevd);
+
+	/* Disable interrupts on GPT1 */
 	writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
 	       u300_timer_base + U300_TIMER_APP_GPT1IE);
-		/* Disable GP1 */
+	/* Disable GP1 while we're reprogramming it. */
 	writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
 	       u300_timer_base + U300_TIMER_APP_DGPT1);
-		break;
-	case CLOCK_EVT_MODE_RESUME:
-		/* Ignore this call */
-		break;
-	}
+	/*
+	 * Set the periodic mode to a certain number of ticks per
+	 * jiffy.
+	 */
+	writel(cevdata->ticks_per_jiffy,
+	       u300_timer_base + U300_TIMER_APP_GPT1TC);
+	/*
+	 * Set continuous mode, so the timer keeps triggering
+	 * interrupts.
+	 */
+	writel(U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS,
+	       u300_timer_base + U300_TIMER_APP_SGPT1M);
+	/* Enable timer interrupts */
+	writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
+	       u300_timer_base + U300_TIMER_APP_GPT1IE);
+	/* Then enable the OS timer again */
+	writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
+	       u300_timer_base + U300_TIMER_APP_EGPT1);
+	return 0;
 }
 
 /*
@@ -315,7 +312,9 @@ static struct u300_clockevent_data u300_clockevent_data = {
 		.features		= CLOCK_EVT_FEAT_PERIODIC |
 					  CLOCK_EVT_FEAT_ONESHOT,
 		.set_next_event		= u300_set_next_event,
-		.set_mode	= u300_set_mode,
+		.set_state_shutdown	= u300_shutdown,
+		.set_state_periodic	= u300_set_periodic,
+		.set_state_oneshot	= u300_set_oneshot,
 	},
 };