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

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

diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 8bdbc45c6dad2a04c3863c753df6afb3bca54d04..d28d2fe798d570a4f3e59f34a549c82ea8ab50c6 100644 (file)
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -91,55 +91,62 @@ static struct tc_clkevt_device *to_tc_clkevt(struct clock_event_device *clkevt)
  */
 static u32 timer_clock;
 
-static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
+static int tc_shutdown(struct clock_event_device *d)
 {
        struct tc_clkevt_device *tcd = to_tc_clkevt(d);
        void __iomem            *regs = tcd->regs;
 
-       if (tcd->clkevt.mode == CLOCK_EVT_MODE_PERIODIC
-                       || tcd->clkevt.mode == CLOCK_EVT_MODE_ONESHOT) {
-               __raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
-               __raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
-               clk_disable(tcd->clk);
-       }
+       __raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
+       __raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
+       clk_disable(tcd->clk);
 
-       switch (m) {
+       return 0;
+}
 
-       /* By not making the gentime core emulate periodic mode on top
-        * of oneshot, we get lower overhead and improved accuracy.
-        */
-       case CLOCK_EVT_MODE_PERIODIC:
-               clk_enable(tcd->clk);
+static int tc_set_oneshot(struct clock_event_device *d)
+{
+       struct tc_clkevt_device *tcd = to_tc_clkevt(d);
+       void __iomem            *regs = tcd->regs;
 
-               /* slow clock, count up to RC, then irq and restart */
-               __raw_writel(timer_clock
-                               | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
-                               regs + ATMEL_TC_REG(2, CMR));
-               __raw_writel((32768 + HZ/2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
+       if (clockevent_state_oneshot(d) || clockevent_state_periodic(d))
+               tc_shutdown(d);
 
-               /* Enable clock and interrupts on RC compare */
-               __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
+       clk_enable(tcd->clk);
 
-               /* go go gadget! */
-               __raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
-                               regs + ATMEL_TC_REG(2, CCR));
-               break;
+       /* slow clock, count up to RC, then irq and stop */
+       __raw_writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE |
+                    ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR));
+       __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
 
-       case CLOCK_EVT_MODE_ONESHOT:
-               clk_enable(tcd->clk);
+       /* set_next_event() configures and starts the timer */
+       return 0;
+}
 
-               /* slow clock, count up to RC, then irq and stop */
-               __raw_writel(timer_clock | ATMEL_TC_CPCSTOP
-                               | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
-                               regs + ATMEL_TC_REG(2, CMR));
-               __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
+static int tc_set_periodic(struct clock_event_device *d)
+{
+       struct tc_clkevt_device *tcd = to_tc_clkevt(d);
+       void __iomem            *regs = tcd->regs;
 
-               /* set_next_event() configures and starts the timer */
-               break;
+       if (clockevent_state_oneshot(d) || clockevent_state_periodic(d))
+               tc_shutdown(d);
 
-       default:
-               break;
-       }
+       /* By not making the gentime core emulate periodic mode on top
+        * of oneshot, we get lower overhead and improved accuracy.
+        */
+       clk_enable(tcd->clk);
+
+       /* slow clock, count up to RC, then irq and restart */
+       __raw_writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
+                    regs + ATMEL_TC_REG(2, CMR));
+       __raw_writel((32768 + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
+
+       /* Enable clock and interrupts on RC compare */
+       __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
+
+       /* go go gadget! */
+       __raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG, regs +
+                    ATMEL_TC_REG(2, CCR));
+       return 0;
 }
 
 static int tc_next_event(unsigned long delta, struct clock_event_device *d)
@@ -154,13 +161,15 @@ static int tc_next_event(unsigned long delta, struct clock_event_device *d)
 
 static struct tc_clkevt_device clkevt = {
        .clkevt = {
-               .name           = "tc_clkevt",
-               .features       = CLOCK_EVT_FEAT_PERIODIC
-                                       | CLOCK_EVT_FEAT_ONESHOT,
+               .name                   = "tc_clkevt",
+               .features               = CLOCK_EVT_FEAT_PERIODIC |
+                                         CLOCK_EVT_FEAT_ONESHOT,
                /* Should be lower than at91rm9200's system timer */
-               .rating         = 125,
-               .set_next_event = tc_next_event,
-               .set_mode       = tc_mode,
+               .rating                 = 125,
+               .set_next_event         = tc_next_event,
+               .set_state_shutdown     = tc_shutdown,
+               .set_state_periodic     = tc_set_periodic,
+               .set_state_oneshot      = tc_set_oneshot,
        },
 };