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authorKevin Hilman <khilman@mvista.com>2007-03-08 20:30:38 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-04-21 21:02:51 +0100
commit89df127246f23add865f4a8f719c990e41151843 (patch)
tree990c1ca750828d0b7ab0d813eef989ff269acff7 /arch/arm/mach-versatile
parentb49c87c2a5059af14b68ee5f596ac0e9c93678bb (diff)
[ARM] 4261/1: clockevent support for Versatile platform
Update Versatile platform to use new clockevent infrastructure. Signed-off-by: Kevin Hilman <khilman@mvista.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-versatile')
-rw-r--r--arch/arm/mach-versatile/core.c68
1 files changed, 58 insertions, 10 deletions
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 08a9fe6eeadb..1275aa7d2eb1 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -27,6 +27,7 @@
#include <linux/amba/bus.h>
#include <linux/amba/clcd.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <asm/cnt32_to_63.h>
#include <asm/system.h>
@@ -829,19 +830,61 @@ void __init versatile_init(void)
#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
#endif
+static void timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *clk)
+{
+ unsigned long ctrl;
+
+ switch(mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
+
+ ctrl = TIMER_CTRL_PERIODIC;
+ ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE | TIMER_CTRL_ENABLE;
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ /* period set, and timer enabled in 'next_event' hook */
+ ctrl = TIMER_CTRL_ONESHOT;
+ ctrl |= TIMER_CTRL_32BIT | TIMER_CTRL_IE;
+ break;
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ default:
+ ctrl = 0;
+ }
+
+ writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL);
+}
+
+static int timer_set_next_event(unsigned long evt,
+ struct clock_event_device *unused)
+{
+ unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL);
+
+ writel(evt, TIMER0_VA_BASE + TIMER_LOAD);
+ writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL);
+
+ return 0;
+}
+
+static struct clock_event_device timer0_clockevent = {
+ .name = "timer0",
+ .shift = 32,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .set_mode = timer_set_mode,
+ .set_next_event = timer_set_next_event,
+};
+
/*
* IRQ handler for the timer
*/
static irqreturn_t versatile_timer_interrupt(int irq, void *dev_id)
{
- write_seqlock(&xtime_lock);
+ struct clock_event_device *evt = &timer0_clockevent;
- // ...clear the interrupt
writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
- timer_tick();
-
- write_sequnlock(&xtime_lock);
+ evt->event_handler(evt);
return IRQ_HANDLED;
}
@@ -909,17 +952,22 @@ static void __init versatile_timer_init(void)
writel(0, TIMER2_VA_BASE + TIMER_CTRL);
writel(0, TIMER3_VA_BASE + TIMER_CTRL);
- writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
- writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_VALUE);
- writel(TIMER_DIVISOR | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC |
- TIMER_CTRL_IE, TIMER0_VA_BASE + TIMER_CTRL);
-
/*
* Make irqs happen for the system timer
*/
setup_irq(IRQ_TIMERINT0_1, &versatile_timer_irq);
versatile_clocksource_init();
+
+ timer0_clockevent.mult =
+ div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
+ timer0_clockevent.max_delta_ns =
+ clockevent_delta2ns(0xffffffff, &timer0_clockevent);
+ timer0_clockevent.min_delta_ns =
+ clockevent_delta2ns(0xf, &timer0_clockevent);
+
+ timer0_clockevent.cpumask = cpumask_of_cpu(0);
+ clockevents_register_device(&timer0_clockevent);
}
struct sys_timer versatile_timer = {