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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>
This commit is contained in:
Russell King 2013-11-30 12:21:21 +00:00
parent 6cefe92f29
commit 4808972a1c
1 changed files with 20 additions and 2 deletions
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22
arch/arm/mach-footbridge/dc21285-timer.c
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@ -47,6 +47,16 @@ static struct clocksource cksrc_dc21285 = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS, .flags = CLOCK_SOURCE_IS_CONTINUOUS,
}; };
static int ckevt_dc21285_set_next_event(unsigned long delta,
struct clock_event_device *c)
{
*CSR_TIMER1_CLR = 0;
*CSR_TIMER1_LOAD = delta;
*CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_DIV16;
return 0;
}
static void ckevt_dc21285_set_mode(enum clock_event_mode mode, static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
struct clock_event_device *c) struct clock_event_device *c)
{ {
@ -59,7 +69,9 @@ static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
TIMER_CNTL_DIV16; TIMER_CNTL_DIV16;
break; break;
default: case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
*CSR_TIMER1_CNTL = 0; *CSR_TIMER1_CNTL = 0;
break; break;
} }
@ -67,9 +79,11 @@ static void ckevt_dc21285_set_mode(enum clock_event_mode mode,
static struct clock_event_device ckevt_dc21285 = { static struct clock_event_device ckevt_dc21285 = {
.name = "dc21285_timer1", .name = "dc21285_timer1",
.features = CLOCK_EVT_FEAT_PERIODIC, .features = CLOCK_EVT_FEAT_PERIODIC |
CLOCK_EVT_FEAT_ONESHOT,
.rating = 200, .rating = 200,
.irq = IRQ_TIMER1, .irq = IRQ_TIMER1,
.set_next_event = ckevt_dc21285_set_next_event,
.set_mode = ckevt_dc21285_set_mode, .set_mode = ckevt_dc21285_set_mode,
}; };
@ -79,6 +93,10 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id)
*CSR_TIMER1_CLR = 0; *CSR_TIMER1_CLR = 0;
/* Stop the timer if in one-shot mode */
if (ce->mode == CLOCK_EVT_MODE_ONESHOT)
*CSR_TIMER1_CNTL = 0;
ce->event_handler(ce); ce->event_handler(ce);
return IRQ_HANDLED; return IRQ_HANDLED;