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rk29: implement sched_clock()

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This commit is contained in:
黄涛 2011-03-11 13:20:01 +08:00
parent 2455208a7a
commit b02fd5a7e6
2 changed files with 33 additions and 3 deletions
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2
arch/arm/Kconfig
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@ -721,10 +721,10 @@ config ARCH_RK2818
config ARCH_RK29
bool "Rockchip Soc Rk29"
select HAVE_CLK
select CPU_V7
select HAVE_CLK
select COMMON_CLKDEV
select HAVE_SCHED_CLOCK
select ARCH_HAS_CPUFREQ
select GENERIC_TIME
select GENERIC_CLOCKEVENTS

34
arch/arm/mach-rk29/timer.c
View File

@ -21,6 +21,7 @@
#include <linux/clockchips.h>
#include <linux/io.h>
#include <asm/sched_clock.h>
#include <asm/mach/time.h>
#include <mach/rk29_iomap.h>
@ -166,12 +167,20 @@ static cycle_t rk29_timer_read(struct clocksource *cs)
return ~RK_TIMER_READVALUE(TIMER_CLKSRC);
}
/*
* Constants generated by clocksource_hz2mult(24000000, 26).
* This gives a resolution of about 41ns and a wrap period of about 178s.
*/
#define MULT 2796202667u
#define SHIFT 26
#define MASK (u32)~0
static struct clocksource rk29_timer_clocksource = {
.name = TIMER_CLKSRC_NAME,
.rating = 200,
.read = rk29_timer_read,
.mask = CLOCKSOURCE_MASK(32),
.shift = 26,
.shift = SHIFT,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@ -189,15 +198,36 @@ static void __init rk29_timer_init_clocksource(void)
RK_TIMER_SETCOUNT(TIMER_CLKSRC, 0xFFFFFFFF);
RK_TIMER_ENABLE_FREE_RUNNING(TIMER_CLKSRC);
cs->mult = clocksource_hz2mult(24000000, cs->shift);
cs->mult = MULT;
if (clocksource_register(cs))
printk(err, cs->name);
}
static DEFINE_CLOCK_DATA(cd);
unsigned long long notrace sched_clock(void)
{
u32 cyc = ~RK_TIMER_READVALUE(TIMER_CLKSRC);
return cyc_to_fixed_sched_clock(&cd, cyc, MASK, MULT, SHIFT);
}
static void notrace rk29_update_sched_clock(void)
{
u32 cyc = ~RK_TIMER_READVALUE(TIMER_CLKSRC);
update_sched_clock(&cd, cyc, MASK);
}
static void __init rk29_sched_clock_init(void)
{
init_fixed_sched_clock(&cd, rk29_update_sched_clock,
32, 24000000, MULT, SHIFT);
}
static void __init rk29_timer_init(void)
{
rk29_timer_init_clocksource();
rk29_timer_init_clockevent();
rk29_sched_clock_init();
}
struct sys_timer rk29_timer = {