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authorLinus Walleij <linus.walleij@linaro.org>2011-09-08 21:21:42 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-10-17 09:12:43 +0100
commit02f5632122ccbb6eb0c3b3f612b564b659defb32 (patch)
tree641f61b76c4a16b9d9f85422e8bda333d94ff767 /arch/arm/mach-integrator
parent1b56b17f9903b6a17b8bb8d72d885f6d12b4d597 (diff)
ARM: 7085/2: mach-integrator: clockevent supports oneshot mode
The Integrator AP timer has no problem supporting oneshot ticks with proper code, so let's do it so we can have NOHZ configured in for this platform too. Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-integrator')
-rw-r--r--arch/arm/mach-integrator/integrator_ap.c24
1 files changed, 19 insertions, 5 deletions
diff --git a/arch/arm/mach-integrator/integrator_ap.c b/arch/arm/mach-integrator/integrator_ap.c
index aa30ab65018..e66a8bce399 100644
--- a/arch/arm/mach-integrator/integrator_ap.c
+++ b/arch/arm/mach-integrator/integrator_ap.c
@@ -360,15 +360,29 @@ static void clkevt_set_mode(enum clock_event_mode mode, struct clock_event_devic
{
u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE;
- BUG_ON(mode == CLOCK_EVT_MODE_ONESHOT);
+ /* Disable timer */
+ writel(ctrl, clkevt_base + TIMER_CTRL);
- if (mode == CLOCK_EVT_MODE_PERIODIC) {
- writel(ctrl, clkevt_base + TIMER_CTRL);
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ /* Enable the timer and start the periodic tick */
writel(timer_reload, clkevt_base + TIMER_LOAD);
ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
+ writel(ctrl, clkevt_base + TIMER_CTRL);
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ /* Leave the timer disabled, .set_next_event will enable it */
+ ctrl &= ~TIMER_CTRL_PERIODIC;
+ writel(ctrl, clkevt_base + TIMER_CTRL);
+ break;
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
+ default:
+ /* Just leave in disabled state */
+ break;
}
- writel(ctrl, clkevt_base + TIMER_CTRL);
}
static int clkevt_set_next_event(unsigned long next, struct clock_event_device *evt)
@@ -385,7 +399,7 @@ static int clkevt_set_next_event(unsigned long next, struct clock_event_device *
static struct clock_event_device integrator_clockevent = {
.name = "timer1",
.shift = 34,
- .features = CLOCK_EVT_FEAT_PERIODIC,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = clkevt_set_mode,
.set_next_event = clkevt_set_next_event,
.rating = 300,