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[ARM] pxa: make pxa timer initialisation select clock rate at runtime 

Rather than using the compile-time constant CLOCK_TICK_RATE, select
the clock tick rate at run time.  We organise the selection so that
PXA3 automatically falls out with the right tick rate.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2007-09-01 21:12:50 +01:00 committed by Russell King
parent 6c3a158316
commit 08197f6e3b
1 changed files with 13 additions and 3 deletions
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16
arch/arm/mach-pxa/time.c
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@ -23,6 +23,7 @@
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
#include <asm/arch/pxa-regs.h>
#include <asm/mach-types.h>
/*
* This is PXA's sched_clock implementation. This has a resolution
@ -186,20 +187,29 @@ static struct irqaction pxa_ost0_irq = {
static void __init pxa_timer_init(void)
{
unsigned long clock_tick_rate;
OIER = 0;
OSSR = OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3;
set_oscr2ns_scale(CLOCK_TICK_RATE);
if (cpu_is_pxa21x() || cpu_is_pxa25x())
clock_tick_rate = 3686400;
else if (machine_is_mainstone())
clock_tick_rate = 3249600;
else
clock_tick_rate = 3250000;
set_oscr2ns_scale(clock_tick_rate);
ckevt_pxa_osmr0.mult =
div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC, ckevt_pxa_osmr0.shift);
div_sc(clock_tick_rate, NSEC_PER_SEC, ckevt_pxa_osmr0.shift);
ckevt_pxa_osmr0.max_delta_ns =
clockevent_delta2ns(0x7fffffff, &ckevt_pxa_osmr0);
ckevt_pxa_osmr0.min_delta_ns =
clockevent_delta2ns(MIN_OSCR_DELTA, &ckevt_pxa_osmr0) + 1;
cksrc_pxa_oscr0.mult =
clocksource_hz2mult(CLOCK_TICK_RATE, cksrc_pxa_oscr0.shift);
clocksource_hz2mult(clock_tick_rate, cksrc_pxa_oscr0.shift);
setup_irq(IRQ_OST0, &pxa_ost0_irq);