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Commit 4808972a authored by Russell King's avatar Russell King
Browse files

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: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 6cefe92f

arch/arm/mach-footbridge/dc21285-timer.c

+20 −2
Original line number Diff line number Diff line
@@ -47,6 +47,16 @@ static struct clocksource cksrc_dc21285 = { 
	.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,

	struct clock_event_device *c)

{
@@ -59,7 +69,9 @@ static void ckevt_dc21285_set_mode(enum clock_event_mode mode, 
				   TIMER_CNTL_DIV16;

		break;



	default:

	case CLOCK_EVT_MODE_ONESHOT:

	case CLOCK_EVT_MODE_UNUSED:

	case CLOCK_EVT_MODE_SHUTDOWN:

		*CSR_TIMER1_CNTL = 0;

		break;

	}
@@ -67,9 +79,11 @@ static void ckevt_dc21285_set_mode(enum clock_event_mode mode, 


static struct clock_event_device ckevt_dc21285 = {

	.name		= "dc21285_timer1",

	.features	= CLOCK_EVT_FEAT_PERIODIC,

	.features	= CLOCK_EVT_FEAT_PERIODIC |

			  CLOCK_EVT_FEAT_ONESHOT,

	.rating		= 200,

	.irq		= IRQ_TIMER1,

	.set_next_event	= ckevt_dc21285_set_next_event,

	.set_mode	= ckevt_dc21285_set_mode,

};
@@ -79,6 +93,10 @@ static irqreturn_t timer1_interrupt(int irq, void *dev_id) 


	*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);



	return IRQ_HANDLED;