ARM: footbridge: add one-shot mode for DC21285 timer
Add a one-shot mode for the DC21285 timer. This allows us to use the NO_HZ modes on this platform. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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6cefe92f29
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@ -47,6 +47,16 @@ static struct clocksource cksrc_dc21285 = {
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static int ckevt_dc21285_set_next_event(unsigned long delta,
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struct clock_event_device *c)
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{
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*CSR_TIMER1_CLR = 0;
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*CSR_TIMER1_LOAD = delta;
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*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_DIV16;
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return 0;
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}
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static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
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struct clock_event_device *c)
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{
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@ -59,7 +69,9 @@ static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
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TIMER_CNTL_DIV16;
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break;
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default:
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case CLOCK_EVT_MODE_ONESHOT:
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case CLOCK_EVT_MODE_UNUSED:
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case CLOCK_EVT_MODE_SHUTDOWN:
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*CSR_TIMER1_CNTL = 0;
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break;
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}
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@ -67,9 +79,11 @@ static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
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static struct clock_event_device ckevt_dc21285 = {
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.name = "dc21285_timer1",
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.features = CLOCK_EVT_FEAT_PERIODIC,
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.features = CLOCK_EVT_FEAT_PERIODIC |
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CLOCK_EVT_FEAT_ONESHOT,
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.rating = 200,
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.irq = IRQ_TIMER1,
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.set_next_event = ckevt_dc21285_set_next_event,
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.set_mode = ckevt_dc21285_set_mode,
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};
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@ -79,6 +93,10 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id)
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*CSR_TIMER1_CLR = 0;
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/* Stop the timer if in one-shot mode */
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if (ce->mode == CLOCK_EVT_MODE_ONESHOT)
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*CSR_TIMER1_CNTL = 0;
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ce->event_handler(ce);
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return IRQ_HANDLED;
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