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authorRussell King <rmk+kernel@arm.linux.org.uk>2011-05-12 15:45:16 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-05-23 18:04:53 +0100
commit23828a7a976eb8dbe3b5f4e83584c3fe814b295b (patch)
tree451a5429fd9fc76cb9714895736db464051ef9c2 /arch/arm/common
parent57cc4f7de2b896ca79185e337eaf7ff9906c4656 (diff)
clockevents: ARM sp804: obtain sp804 timer rate via clks
This allows platforms to specify the rate of the SP804 clockevent via the clk subsystem. While ARM boards clock these at 1MHz, BCMRing also has SP804 timers but are clocked at different rates. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/common')
-rw-r--r--arch/arm/common/timer-sp.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
index 5b7e8c9046be..41df47875122 100644
--- a/arch/arm/common/timer-sp.c
+++ b/arch/arm/common/timer-sp.c
@@ -28,12 +28,6 @@
#include <asm/hardware/arm_timer.h>
-/*
- * These timers are currently always setup to be clocked at 1MHz.
- */
-#define TIMER_FREQ_KHZ (1000)
-#define TIMER_RELOAD (TIMER_FREQ_KHZ * 1000 / HZ)
-
static long __init sp804_get_clock_rate(const char *name)
{
struct clk *clk;
@@ -84,6 +78,7 @@ void __init sp804_clocksource_init(void __iomem *base, const char *name)
static void __iomem *clkevt_base;
+static unsigned long clkevt_reload;
/*
* IRQ handler for the timer
@@ -109,7 +104,7 @@ static void sp804_set_mode(enum clock_event_mode mode,
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- writel(TIMER_RELOAD, clkevt_base + TIMER_LOAD);
+ writel(clkevt_reload, clkevt_base + TIMER_LOAD);
ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
break;
@@ -158,12 +153,17 @@ void __init sp804_clockevents_init(void __iomem *base, unsigned int irq,
const char *name)
{
struct clock_event_device *evt = &sp804_clockevent;
+ long rate = sp804_get_clock_rate(name);
+
+ if (rate < 0)
+ return;
clkevt_base = base;
+ clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
evt->name = name;
evt->irq = irq;
- evt->mult = div_sc(TIMER_FREQ_KHZ, NSEC_PER_MSEC, evt->shift);
+ evt->mult = div_sc(rate, NSEC_PER_SEC, evt->shift);
evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt);
evt->min_delta_ns = clockevent_delta2ns(0xf, evt);