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

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@samsung.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

1 files changed, 40 insertions, 45 deletions

diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c
index 4d2330a92b27..029f96ab131a 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);