forked from luck/tmp_suning_uos_patched
70af26b2d4
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Miles Bader <miles@gnu.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
/*
|
|
* linux/arch/v850/kernel/time.c -- Arch-dependent timer functions
|
|
*
|
|
* Copyright (C) 1991, 1992, 1995, 2001, 2002 Linus Torvalds
|
|
*
|
|
* This file contains the v850-specific time handling details.
|
|
* Most of the stuff is located in the machine specific files.
|
|
*
|
|
* 1997-09-10 Updated NTP code according to technical memorandum Jan '96
|
|
* "A Kernel Model for Precision Timekeeping" by Dave Mills
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/param.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/time.h>
|
|
#include <linux/timex.h>
|
|
#include <linux/profile.h>
|
|
|
|
#include <asm/io.h>
|
|
|
|
#include "mach.h"
|
|
|
|
#define TICK_SIZE (tick_nsec / 1000)
|
|
|
|
/*
|
|
* timer_interrupt() needs to keep up the real-time clock,
|
|
* as well as call the "do_timer()" routine every clocktick
|
|
*/
|
|
static irqreturn_t timer_interrupt (int irq, void *dummy, struct pt_regs *regs)
|
|
{
|
|
#if 0
|
|
/* last time the cmos clock got updated */
|
|
static long last_rtc_update=0;
|
|
#endif
|
|
|
|
/* may need to kick the hardware timer */
|
|
if (mach_tick)
|
|
mach_tick ();
|
|
|
|
do_timer (1);
|
|
#ifndef CONFIG_SMP
|
|
update_process_times(user_mode(regs));
|
|
#endif
|
|
profile_tick(CPU_PROFILING, regs);
|
|
#if 0
|
|
/*
|
|
* If we have an externally synchronized Linux clock, then update
|
|
* CMOS clock accordingly every ~11 minutes. Set_rtc_mmss() has to be
|
|
* called as close as possible to 500 ms before the new second starts.
|
|
*/
|
|
if (ntp_synced() &&
|
|
xtime.tv_sec > last_rtc_update + 660 &&
|
|
(xtime.tv_nsec / 1000) >= 500000 - ((unsigned) TICK_SIZE) / 2 &&
|
|
(xtime.tv_nsec / 1000) <= 500000 + ((unsigned) TICK_SIZE) / 2) {
|
|
if (set_rtc_mmss (xtime.tv_sec) == 0)
|
|
last_rtc_update = xtime.tv_sec;
|
|
else
|
|
last_rtc_update = xtime.tv_sec - 600; /* do it again in 60 s */
|
|
}
|
|
#ifdef CONFIG_HEARTBEAT
|
|
/* use power LED as a heartbeat instead -- much more useful
|
|
for debugging -- based on the version for PReP by Cort */
|
|
/* acts like an actual heart beat -- ie thump-thump-pause... */
|
|
if (mach_heartbeat) {
|
|
static unsigned cnt = 0, period = 0, dist = 0;
|
|
|
|
if (cnt == 0 || cnt == dist)
|
|
mach_heartbeat ( 1 );
|
|
else if (cnt == 7 || cnt == dist+7)
|
|
mach_heartbeat ( 0 );
|
|
|
|
if (++cnt > period) {
|
|
cnt = 0;
|
|
/* The hyperbolic function below modifies the heartbeat period
|
|
* length in dependency of the current (5min) load. It goes
|
|
* through the points f(0)=126, f(1)=86, f(5)=51,
|
|
* f(inf)->30. */
|
|
period = ((672<<FSHIFT)/(5*avenrun[0]+(7<<FSHIFT))) + 30;
|
|
dist = period / 4;
|
|
}
|
|
}
|
|
#endif /* CONFIG_HEARTBEAT */
|
|
#endif /* 0 */
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int timer_dev_id;
|
|
static struct irqaction timer_irqaction = {
|
|
.handler = timer_interrupt,
|
|
.flags = IRQF_DISABLED,
|
|
.mask = CPU_MASK_NONE,
|
|
.name = "timer",
|
|
.dev_id = &timer_dev_id,
|
|
};
|
|
|
|
void time_init (void)
|
|
{
|
|
mach_gettimeofday (&xtime);
|
|
mach_sched_init (&timer_irqaction);
|
|
}
|