x86/hpet: Migrate to new set_state interface

Migrate hpet 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.

Forward definition of 'hpet_clockevent' wasn't required and so it is
placed after all the callback are defined, to avoid forward declaring
all the callbacks.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: linaro-kernel@lists.linaro.org
Cc: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: http://lkml.kernel.org/r/8cc9864b6d6342dfac28f270cf69f4cba46fffae.1437042675.git.viresh.kumar@linaro.orgSigned-off-by: Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/hpet.c

@@ -226,22 +226,7 @@ static void hpet_reserve_platform_timers(unsigned int id) { }
  */
 static unsigned long hpet_freq;
 
-static void hpet_legacy_set_mode(enum clock_event_mode mode,
-			  struct clock_event_device *evt);
-static int hpet_legacy_next_event(unsigned long delta,
-			   struct clock_event_device *evt);
-
-/*
- * The hpet clock event device
- */
-static struct clock_event_device hpet_clockevent = {
-	.name		= "hpet",
-	.features	= CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-	.set_mode	= hpet_legacy_set_mode,
-	.set_next_event = hpet_legacy_next_event,
-	.irq		= 0,
-	.rating		= 50,
-};
+static struct clock_event_device hpet_clockevent;
 
 static void hpet_stop_counter(void)
 {
@@ -306,22 +291,19 @@ static void hpet_legacy_clockevent_register(void)
 	printk(KERN_DEBUG "hpet clockevent registered\n");
 }
 
-static void hpet_set_mode(enum clock_event_mode mode,
-			  struct clock_event_device *evt, int timer)
+static int hpet_set_periodic(struct clock_event_device *evt, int timer)
 {
 	unsigned int cfg, cmp, now;
 	uint64_t delta;
 
-	switch (mode) {
-	case CLOCK_EVT_MODE_PERIODIC:
 	hpet_stop_counter();
-		delta = ((uint64_t)(NSEC_PER_SEC/HZ)) * evt->mult;
+	delta = ((uint64_t)(NSEC_PER_SEC / HZ)) * evt->mult;
 	delta >>= evt->shift;
 	now = hpet_readl(HPET_COUNTER);
-		cmp = now + (unsigned int) delta;
+	cmp = now + (unsigned int)delta;
 	cfg = hpet_readl(HPET_Tn_CFG(timer));
-		cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC |
-		       HPET_TN_SETVAL | HPET_TN_32BIT;
+	cfg |= HPET_TN_ENABLE | HPET_TN_PERIODIC | HPET_TN_SETVAL |
+	       HPET_TN_32BIT;
 	hpet_writel(cfg, HPET_Tn_CFG(timer));
 	hpet_writel(cmp, HPET_Tn_CMP(timer));
 	udelay(1);
@@ -332,38 +314,51 @@ static void hpet_set_mode(enum clock_event_mode mode,
 	 * (See AMD-8111 HyperTransport I/O Hub Data Sheet,
 	 * Publication # 24674)
 	 */
-		hpet_writel((unsigned int) delta, HPET_Tn_CMP(timer));
+	hpet_writel((unsigned int)delta, HPET_Tn_CMP(timer));
 	hpet_start_counter();
 	hpet_print_config();
-		break;
 
-	case CLOCK_EVT_MODE_ONESHOT:
+	return 0;
+}
+
+static int hpet_set_oneshot(struct clock_event_device *evt, int timer)
+{
+	unsigned int cfg;
+
 	cfg = hpet_readl(HPET_Tn_CFG(timer));
 	cfg &= ~HPET_TN_PERIODIC;
 	cfg |= HPET_TN_ENABLE | HPET_TN_32BIT;
 	hpet_writel(cfg, HPET_Tn_CFG(timer));
-		break;
 
-	case CLOCK_EVT_MODE_UNUSED:
-	case CLOCK_EVT_MODE_SHUTDOWN:
+	return 0;
+}
+
+static int hpet_shutdown(struct clock_event_device *evt, int timer)
+{
+	unsigned int cfg;
+
 	cfg = hpet_readl(HPET_Tn_CFG(timer));
 	cfg &= ~HPET_TN_ENABLE;
 	hpet_writel(cfg, HPET_Tn_CFG(timer));
-		break;
 
-	case CLOCK_EVT_MODE_RESUME:
-		if (timer == 0) {
+	return 0;
+}
+
+static int hpet_resume(struct clock_event_device *evt, int timer)
+{
+	if (!timer) {
 		hpet_enable_legacy_int();
 	} else {
 		struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
+
 		irq_domain_activate_irq(irq_get_irq_data(hdev->irq));
 		disable_irq(hdev->irq);
 		irq_set_affinity(hdev->irq, cpumask_of(hdev->cpu));
 		enable_irq(hdev->irq);
 	}
 	hpet_print_config();
-		break;
-	}
+
+	return 0;
 }
 
 static int hpet_next_event(unsigned long delta,
@@ -403,10 +398,24 @@ static int hpet_next_event(unsigned long delta,
 	return res < HPET_MIN_CYCLES ? -ETIME : 0;
 }
 
-static void hpet_legacy_set_mode(enum clock_event_mode mode,
-			struct clock_event_device *evt)
+static int hpet_legacy_shutdown(struct clock_event_device *evt)
 {
-	hpet_set_mode(mode, evt, 0);
+	return hpet_shutdown(evt, 0);
+}
+
+static int hpet_legacy_set_oneshot(struct clock_event_device *evt)
+{
+	return hpet_set_oneshot(evt, 0);
+}
+
+static int hpet_legacy_set_periodic(struct clock_event_device *evt)
+{
+	return hpet_set_periodic(evt, 0);
+}
+
+static int hpet_legacy_resume(struct clock_event_device *evt)
+{
+	return hpet_resume(evt, 0);
 }
 
 static int hpet_legacy_next_event(unsigned long delta,
@@ -415,6 +424,22 @@ static int hpet_legacy_next_event(unsigned long delta,
 	return hpet_next_event(delta, evt, 0);
 }
 
+/*
+ * The hpet clock event device
+ */
+static struct clock_event_device hpet_clockevent = {
+	.name			= "hpet",
+	.features		= CLOCK_EVT_FEAT_PERIODIC |
+				  CLOCK_EVT_FEAT_ONESHOT,
+	.set_state_periodic	= hpet_legacy_set_periodic,
+	.set_state_oneshot	= hpet_legacy_set_oneshot,
+	.set_state_shutdown	= hpet_legacy_shutdown,
+	.tick_resume		= hpet_legacy_resume,
+	.set_next_event		= hpet_legacy_next_event,
+	.irq			= 0,
+	.rating			= 50,
+};
+
 /*
  * HPET MSI Support
  */
@@ -459,11 +484,32 @@ void hpet_msi_read(struct hpet_dev *hdev, struct msi_msg *msg)
 	msg->address_hi = 0;
 }
 
-static void hpet_msi_set_mode(enum clock_event_mode mode,
-				struct clock_event_device *evt)
+static int hpet_msi_shutdown(struct clock_event_device *evt)
+{
+	struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
+
+	return hpet_shutdown(evt, hdev->num);
+}
+
+static int hpet_msi_set_oneshot(struct clock_event_device *evt)
+{
+	struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
+
+	return hpet_set_oneshot(evt, hdev->num);
+}
+
+static int hpet_msi_set_periodic(struct clock_event_device *evt)
 {
 	struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
-	hpet_set_mode(mode, evt, hdev->num);
+
+	return hpet_set_periodic(evt, hdev->num);
+}
+
+static int hpet_msi_resume(struct clock_event_device *evt)
+{
+	struct hpet_dev *hdev = EVT_TO_HPET_DEV(evt);
+
+	return hpet_resume(evt, hdev->num);
 }
 
 static int hpet_msi_next_event(unsigned long delta,
@@ -523,10 +569,14 @@ static void init_one_hpet_msi_clockevent(struct hpet_dev *hdev, int cpu)
 
 	evt->rating = 110;
 	evt->features = CLOCK_EVT_FEAT_ONESHOT;
-	if (hdev->flags & HPET_DEV_PERI_CAP)
+	if (hdev->flags & HPET_DEV_PERI_CAP) {
 		evt->features |= CLOCK_EVT_FEAT_PERIODIC;
+		evt->set_state_periodic = hpet_msi_set_periodic;
+	}
 
-	evt->set_mode = hpet_msi_set_mode;
+	evt->set_state_shutdown = hpet_msi_shutdown;
+	evt->set_state_oneshot = hpet_msi_set_oneshot;
+	evt->tick_resume = hpet_msi_resume;
 	evt->set_next_event = hpet_msi_next_event;
 	evt->cpumask = cpumask_of(hdev->cpu);