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ARM: davinci: convert to common sched_clock() implementation

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Davinci has its own sched_clock() implementation, which gets in the
way of a single zImage. Moving to the common sched_clock framework
makes the code slightly cleaner.

Acked-by: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2012-01-16 11:44:12 +00:00
parent 5d0ef6ae63
commit 30c9c5b157
2 changed files with 8 additions and 17 deletions
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1
arch/arm/Kconfig
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@ -932,6 +932,7 @@ config ARCH_DAVINCI
select ARCH_REQUIRE_GPIOLIB
select ZONE_DMA
select HAVE_IDE
select HAVE_SCHED_CLOCK
select CLKDEV_LOOKUP
select GENERIC_ALLOCATOR
select GENERIC_IRQ_CHIP

24
arch/arm/mach-davinci/time.c
View File

@ -19,6 +19,7 @@
#include <linux/err.h>
#include <linux/platform_device.h>
#include <asm/sched_clock.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
@ -274,19 +275,9 @@ static cycle_t read_cycles(struct clocksource *cs)
return (cycles_t)timer32_read(t);
}
/*
* Kernel assumes that sched_clock can be called early but may not have
* things ready yet.
*/
static cycle_t read_dummy(struct clocksource *cs)
{
return 0;
}
static struct clocksource clocksource_davinci = {
.rating = 300,
.read = read_dummy,
.read = read_cycles,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@ -294,12 +285,9 @@ static struct clocksource clocksource_davinci = {
/*
* Overwrite weak default sched_clock with something more precise
*/
unsigned long long notrace sched_clock(void)
static u32 notrace davinci_read_sched_clock(void)
{
const cycle_t cyc = clocksource_davinci.read(&clocksource_davinci);
return clocksource_cyc2ns(cyc, clocksource_davinci.mult,
clocksource_davinci.shift);
return timer32_read(&timers[TID_CLOCKSOURCE]);
}
/*
@ -399,12 +387,14 @@ static void __init davinci_timer_init(void)
davinci_clock_tick_rate = clk_get_rate(timer_clk);
/* setup clocksource */
clocksource_davinci.read = read_cycles;
clocksource_davinci.name = id_to_name[clocksource_id];
if (clocksource_register_hz(&clocksource_davinci,
davinci_clock_tick_rate))
printk(err, clocksource_davinci.name);
setup_sched_clock(davinci_read_sched_clock, 32,
davinci_clock_tick_rate);
/* setup clockevent */
clockevent_davinci.name = id_to_name[timers[TID_CLOCKEVENT].id];
clockevent_davinci.mult = div_sc(davinci_clock_tick_rate, NSEC_PER_SEC,