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| author |   Russell King <rmk@dyn-67.arm.linux.org.uk> | 2007-09-01 21:12:50 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@arm.linux.org.uk> | 2007-10-12 21:14:43 +0100 |
| commit | 08197f6e3b262f4fb8b164c818d5e54b46c14711 (patch) | |
| tree | a41fd3f3141def6021eb797b62c15ccf2a3a3e3d /arch/arm/mach-pxa/time.c | |
| parent | [ARM] 4550/1: sched_clock on PXA should cope with run time clock rate selection (diff) | |
| download | linux-dev-08197f6e3b262f4fb8b164c818d5e54b46c14711.tar.xz linux-dev-08197f6e3b262f4fb8b164c818d5e54b46c14711.zip | |
[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>
Diffstat (limited to 'arch/arm/mach-pxa/time.c')
| -rw-r--r-- | arch/arm/mach-pxa/time.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/arm/mach-pxa/time.c b/arch/arm/mach-pxa/time.c index 7916311547ca..ec4286c7931c 100644 --- a/arch/arm/mach-pxa/time.c +++ b/arch/arm/mach-pxa/time.c @@ -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); |