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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-01-15 21:49:23 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-04-29 18:04:16 +0100
commit13edd86d7a8b64735c60c308faac785a6f2257b2 (patch)
tree94fefea5ea04b46a005154981ffcb66cd50e12b7 /arch/arm/mach-integrator
parentb9cedda230793cbf58eb012ddadedd490cc8e129 (diff)
downloadop-kernel-dev-13edd86d7a8b64735c60c308faac785a6f2257b2.zip
op-kernel-dev-13edd86d7a8b64735c60c308faac785a6f2257b2.tar.gz
ARM: Integrator: convert to generic clockevent support
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/core.c107
1 files changed, 73 insertions, 34 deletions
diff --git a/arch/arm/mach-integrator/core.c b/arch/arm/mach-integrator/core.c
index 87c6f98..b1ccbe3 100644
--- a/arch/arm/mach-integrator/core.c
+++ b/arch/arm/mach-integrator/core.c
@@ -20,6 +20,7 @@
#include <linux/amba/bus.h>
#include <linux/amba/serial.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <linux/io.h>
#include <asm/clkdev.h>
@@ -275,61 +276,99 @@ static void integrator_clocksource_init(u32 khz)
clocksource_register(cs);
}
+static void __iomem * const clkevt_base = (void __iomem *)TIMER1_VA_BASE;
+
/*
* IRQ handler for the timer
*/
-static irqreturn_t
-integrator_timer_interrupt(int irq, void *dev_id)
+static irqreturn_t integrator_timer_interrupt(int irq, void *dev_id)
{
- /*
- * clear the interrupt
- */
- writel(1, TIMER1_VA_BASE + TIMER_INTCLR);
+ struct clock_event_device *evt = dev_id;
+
+ /* clear the interrupt */
+ writel(1, clkevt_base + TIMER_INTCLR);
- timer_tick();
+ evt->event_handler(evt);
return IRQ_HANDLED;
}
+static void clkevt_set_mode(enum clock_event_mode mode, struct clock_event_device *evt)
+{
+ u32 ctrl = readl(clkevt_base + TIMER_CTRL) & ~TIMER_CTRL_ENABLE;
+
+ BUG_ON(mode == CLOCK_EVT_MODE_ONESHOT);
+
+ if (mode == CLOCK_EVT_MODE_PERIODIC) {
+ writel(ctrl, clkevt_base + TIMER_CTRL);
+ writel(timer_reload, clkevt_base + TIMER_LOAD);
+ ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
+ }
+
+ writel(ctrl, clkevt_base + TIMER_CTRL);
+}
+
+static int clkevt_set_next_event(unsigned long next, struct clock_event_device *evt)
+{
+ unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
+
+ writel(ctrl & ~TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
+ writel(next, clkevt_base + TIMER_LOAD);
+ writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
+
+ return 0;
+}
+
+static struct clock_event_device integrator_clockevent = {
+ .name = "timer1",
+ .shift = 34,
+ .features = CLOCK_EVT_FEAT_PERIODIC,
+ .set_mode = clkevt_set_mode,
+ .set_next_event = clkevt_set_next_event,
+ .rating = 300,
+ .cpumask = cpu_all_mask,
+};
+
static struct irqaction integrator_timer_irq = {
- .name = "Integrator Timer Tick",
+ .name = "timer",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = integrator_timer_interrupt,
+ .dev_id = &integrator_clockevent,
};
-/*
- * Set up timer interrupt, and return the current time in seconds.
- */
-void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
+static void integrator_clockevent_init(u32 khz, unsigned int ctrl)
{
- unsigned int timer_ctrl = TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC;
+ struct clock_event_device *evt = &integrator_clockevent;
- integrator_clocksource_init(reload * HZ / 1000);
+ if (khz * 1000 > 0x100000 * HZ) {
+ khz /= 256;
+ ctrl |= TIMER_CTRL_DIV256;
+ } else if (khz * 1000 > 0x10000 * HZ) {
+ khz /= 16;
+ ctrl |= TIMER_CTRL_DIV16;
+ }
- timer_reload = reload;
- timer_ctrl |= ctrl;
+ timer_reload = khz * 1000 / HZ;
+ writel(ctrl, clkevt_base + TIMER_CTRL);
- if (timer_reload > 0x100000) {
- timer_reload >>= 8;
- timer_ctrl |= TIMER_CTRL_DIV256;
- } else if (timer_reload > 0x010000) {
- timer_reload >>= 4;
- timer_ctrl |= TIMER_CTRL_DIV16;
- }
+ evt->irq = IRQ_TIMERINT1;
+ evt->mult = div_sc(khz, NSEC_PER_MSEC, evt->shift);
+ evt->max_delta_ns = clockevent_delta2ns(0xffff, evt);
+ evt->min_delta_ns = clockevent_delta2ns(0xf, evt);
- /*
- * Initialise to a known state (all timers off)
- */
+ setup_irq(IRQ_TIMERINT1, &integrator_timer_irq);
+ clockevents_register_device(evt);
+}
+
+/*
+ * Set up timer(s).
+ */
+void __init integrator_time_init(unsigned long reload, unsigned int ctrl)
+{
writel(0, TIMER0_VA_BASE + TIMER_CTRL);
writel(0, TIMER1_VA_BASE + TIMER_CTRL);
writel(0, TIMER2_VA_BASE + TIMER_CTRL);
- writel(timer_reload, TIMER1_VA_BASE + TIMER_LOAD);
- writel(timer_reload, TIMER1_VA_BASE + TIMER_VALUE);
- writel(timer_ctrl, TIMER1_VA_BASE + TIMER_CTRL);
-
- /*
- * Make irqs happen for the system timer
- */
- setup_irq(IRQ_TIMERINT1, &integrator_timer_irq);
+ integrator_clocksource_init(reload * HZ / 1000);
+ integrator_clockevent_init(reload * HZ / 1000, ctrl);
}
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