AcoSail/kernel_optimize_test
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sh: rework clocksource and sched_clock

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Rework and simplify the sched_clock and clocksource code. Instead
of registering the clocksource in a shared file we move it into the
tmu driver. Also, add code to handle sched_clock in the case of no
clocksource.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-01-22 09:55:31 +00:00 committed by Paul Mundt
parent dc66ff6220
commit 955c077872
3 changed files with 19 additions and 54 deletions
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4
arch/sh/include/asm/timer.h
View File

@ -9,7 +9,6 @@ struct sys_timer_ops {
int (*init)(void);
int (*start)(void);
int (*stop)(void);
cycle_t (*read)(void);
#ifndef CONFIG_GENERIC_TIME
unsigned long (*get_offset)(void);
#endif
@ -39,6 +38,7 @@ struct sys_timer *get_sys_timer(void);
/* arch/sh/kernel/time.c */
void handle_timer_tick(void);
extern unsigned long sh_hpt_frequency;
extern struct clocksource clocksource_sh;
#endif /* __ASM_SH_TIMER_H */

59
arch/sh/kernel/time_32.c
View File

@ -41,14 +41,6 @@ static int null_rtc_set_time(const time_t secs)
return 0;
}
/*
* Null high precision timer functions for systems lacking one.
*/
static cycle_t null_hpt_read(void)
{
return 0;
}
void (*rtc_sh_get_time)(struct timespec *) = null_rtc_get_time;
int (*rtc_sh_set_time)(const time_t) = null_rtc_set_time;
@ -200,42 +192,21 @@ device_initcall(timer_init_sysfs);
void (*board_time_init)(void);
/*
* Shamelessly based on the MIPS and Sparc64 work.
*/
static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
unsigned long sh_hpt_frequency = 0;
#define NSEC_PER_CYC_SHIFT 10
static struct clocksource clocksource_sh = {
struct clocksource clocksource_sh = {
.name = "SuperH",
.rating = 200,
.mask = CLOCKSOURCE_MASK(32),
.read = null_hpt_read,
.shift = 16,
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init init_sh_clocksource(void)
{
if (!sh_hpt_frequency || clocksource_sh.read == null_hpt_read)
return;
clocksource_sh.mult = clocksource_hz2mult(sh_hpt_frequency,
clocksource_sh.shift);
timer_ticks_per_nsec_quotient =
clocksource_hz2mult(sh_hpt_frequency, NSEC_PER_CYC_SHIFT);
clocksource_register(&clocksource_sh);
}
#ifdef CONFIG_GENERIC_TIME
unsigned long long sched_clock(void)
{
unsigned long long ticks = clocksource_sh.read();
return (ticks * timer_ticks_per_nsec_quotient) >> NSEC_PER_CYC_SHIFT;
unsigned long long cycles;
/* jiffies based sched_clock if no clocksource is installed */
if (!clocksource_sh.rating)
return (unsigned long long)jiffies * (NSEC_PER_SEC / HZ);
cycles = clocksource_sh.read();
return cyc2ns(&clocksource_sh, cycles);
}
#endif
@ -260,16 +231,4 @@ void __init time_init(void)
*/
sys_timer = get_sys_timer();
printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
if (sys_timer->ops->read)
clocksource_sh.read = sys_timer->ops->read;
init_sh_clocksource();
if (sh_hpt_frequency)
printk("Using %lu.%03lu MHz high precision timer.\n",
((sh_hpt_frequency + 500) / 1000) / 1000,
((sh_hpt_frequency + 500) / 1000) % 1000);
}

10
arch/sh/kernel/timers/timer-tmu.c
View File

@ -254,7 +254,14 @@ static int tmu_timer_init(void)
_tmu_start(TMU1);
sh_hpt_frequency = clk_get_rate(&tmu1_clk);
clocksource_sh.rating = 200;
clocksource_sh.mask = CLOCKSOURCE_MASK(32);
clocksource_sh.read = tmu_timer_read;
clocksource_sh.shift = 10;
clocksource_sh.mult = clocksource_hz2mult(clk_get_rate(&tmu1_clk),
clocksource_sh.shift);
clocksource_sh.flags = CLOCK_SOURCE_IS_CONTINUOUS;
clocksource_register(&clocksource_sh);
tmu0_clockevent.mult = div_sc(frequency, NSEC_PER_SEC,
tmu0_clockevent.shift);
@ -274,7 +281,6 @@ static struct sys_timer_ops tmu_timer_ops = {
.init = tmu_timer_init,
.start = tmu_timer_start,
.stop = tmu_timer_stop,
.read = tmu_timer_read,
};
struct sys_timer tmu_timer = {