ARM/w90x900/time: Migrate to new 'set-state' interface

Migrate w90x900 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: Wan ZongShun <mcuos.com@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

arch/arm/mach-w90x900/time.c

@@ -48,31 +48,32 @@
 
 static unsigned int timer0_load;
 
-static void nuc900_clockevent_setmode(enum clock_event_mode mode,
-		struct clock_event_device *clk)
+static int nuc900_clockevent_shutdown(struct clock_event_device *evt)
 {
-	unsigned int val;
+	unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
 
-	val = __raw_readl(REG_TCSR0);
-	val &= ~(0x03 << 27);
+	__raw_writel(val, REG_TCSR0);
+	return 0;
+}
 
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
-		__raw_writel(timer0_load, REG_TICR0);
-		val |= (PERIOD | COUNTEN | INTEN | PRESCALE);
-		break;
+static int nuc900_clockevent_set_oneshot(struct clock_event_device *evt)
+{
+	unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
 
-	case CLOCK_EVT_MODE_ONESHOT:
 	val |= (ONESHOT | COUNTEN | INTEN | PRESCALE);
-		break;
 
-	case CLOCK_EVT_MODE_UNUSED:
-	case CLOCK_EVT_MODE_SHUTDOWN:
-	case CLOCK_EVT_MODE_RESUME:
-		break;
-	}
+	__raw_writel(val, REG_TCSR0);
+	return 0;
+}
+
+static int nuc900_clockevent_set_periodic(struct clock_event_device *evt)
+{
+	unsigned int val = __raw_readl(REG_TCSR0) & ~(0x03 << 27);
 
+	__raw_writel(timer0_load, REG_TICR0);
+	val |= (PERIOD | COUNTEN | INTEN | PRESCALE);
 	__raw_writel(val, REG_TCSR0);
+	return 0;
 }
 
 static int nuc900_clockevent_setnextevent(unsigned long evt,
@@ -91,8 +92,12 @@ static int nuc900_clockevent_setnextevent(unsigned long evt,
 
 static struct clock_event_device nuc900_clockevent_device = {
 	.name			= "nuc900-timer0",
-	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-	.set_mode	= nuc900_clockevent_setmode,
+	.features		= CLOCK_EVT_FEAT_PERIODIC |
+				  CLOCK_EVT_FEAT_ONESHOT,
+	.set_state_shutdown	= nuc900_clockevent_shutdown,
+	.set_state_periodic	= nuc900_clockevent_set_periodic,
+	.set_state_oneshot	= nuc900_clockevent_set_oneshot,
+	.tick_resume		= nuc900_clockevent_shutdown,
 	.set_next_event		= nuc900_clockevent_setnextevent,
 	.rating			= 300,
 };