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/*
* arch/sh/kernel/time_32.c
*
* Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
* Copyright (C) 2002 - 2009 Paul Mundt
* Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org>
*
* Some code taken from i386 version.
* Copyright (C) 1991, 1992, 1995 Linus Torvalds
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/profile.h>
#include <linux/timex.h>
#include <linux/sched.h>
#include <linux/clockchips.h>
#include <linux/mc146818rtc.h> /* for rtc_lock */
#include <linux/platform_device.h>
#include <linux/smp.h>
#include <linux/rtc.h>
#include <asm/clock.h>
#include <asm/rtc.h>
#include <asm/timer.h>
#include <asm/kgdb.h>
struct sys_timer *sys_timer;
/* Move this somewhere more sensible.. */
DEFINE_SPINLOCK(rtc_lock);
EXPORT_SYMBOL(rtc_lock);
/* Dummy RTC ops */
static void null_rtc_get_time(struct timespec *tv)
{
tv->tv_sec = mktime(2000, 1, 1, 0, 0, 0);
tv->tv_nsec = 0;
}
static int null_rtc_set_time(const time_t secs)
{
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;
unsigned int get_rtc_time(struct rtc_time *tm)
{
if (rtc_sh_get_time != null_rtc_get_time) {
struct timespec tv;
rtc_sh_get_time(&tv);
rtc_time_to_tm(tv.tv_sec, tm);
}
return RTC_24H;
}
EXPORT_SYMBOL(get_rtc_time);
int set_rtc_time(struct rtc_time *tm)
{
unsigned long secs;
rtc_tm_to_time(tm, &secs);
return rtc_sh_set_time(secs);
}
EXPORT_SYMBOL(set_rtc_time);
static int __init rtc_generic_init(void)
{
struct platform_device *pdev;
if (rtc_sh_get_time == null_rtc_get_time)
return -ENODEV;
pdev = platform_device_register_simple("rtc-generic", -1, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
return 0;
}
module_init(rtc_generic_init);
/* last time the RTC clock got updated */
static long last_rtc_update;
/*
* handle_timer_tick() needs to keep up the real-time clock,
* as well as call the "do_timer()" routine every clocktick
*/
void handle_timer_tick(void)
{
if (current->pid)
profile_tick(CPU_PROFILING);
/*
* Here we are in the timer irq handler. We just have irqs locally
* disabled but we don't know if the timer_bh is running on the other
* CPU. We need to avoid to SMP race with it. NOTE: we don' t need
* the irq version of write_lock because as just said we have irq
* locally disabled. -arca
*/
write_seqlock(&xtime_lock);
do_timer(1);
/*
* If we have an externally synchronized Linux clock, then update
* RTC 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 (rtc_sh_set_time(xtime.tv_sec) == 0)
last_rtc_update = xtime.tv_sec;
else
/* do it again in 60s */
last_rtc_update = xtime.tv_sec - 600;
}
write_sequnlock(&xtime_lock);
#ifndef CONFIG_SMP
update_process_times(user_mode(get_irq_regs()));
#endif
}
#ifdef CONFIG_PM
int timer_suspend(struct sys_device *dev, pm_message_t state)
{
struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev);
sys_timer->ops->stop();
return 0;
}
int timer_resume(struct sys_device *dev)
{
struct sys_timer *sys_timer = container_of(dev, struct sys_timer, dev);
sys_timer->ops->start();
return 0;
}
#else
#define timer_suspend NULL
#define timer_resume NULL
#endif
static struct sysdev_class timer_sysclass = {
.name = "timer",
.suspend = timer_suspend,
.resume = timer_resume,
};
static int __init timer_init_sysfs(void)
{
int ret;
if (!sys_timer)
return 0;
ret = sysdev_class_register(&timer_sysclass);
if (ret != 0)
return ret;
sys_timer->dev.cls = &timer_sysclass;
return sysdev_register(&sys_timer->dev);
}
device_initcall(timer_init_sysfs);
void (*board_time_init)(void);
struct clocksource clocksource_sh = {
.name = "SuperH",
};
unsigned long long sched_clock(void)
{
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(&clocksource_sh);
return cyc2ns(&clocksource_sh, cycles);
}
static void __init sh_late_time_init(void)
{
/*
* Make sure all compiled-in early timers register themselves.
* Run probe() for one "earlytimer" device.
*/
early_platform_driver_register_all("earlytimer");
if (early_platform_driver_probe("earlytimer", 1, 0))
return;
/*
* Find the timer to use as the system timer, it will be
* initialized for us.
*/
sys_timer = get_sys_timer();
if (unlikely(!sys_timer))
panic("System timer missing.\n");
printk(KERN_INFO "Using %s for system timer\n", sys_timer->name);
}
void __init time_init(void)
{
if (board_time_init)
board_time_init();
clk_init();
rtc_sh_get_time(&xtime);
set_normalized_timespec(&wall_to_monotonic,
-xtime.tv_sec, -xtime.tv_nsec);
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
local_timer_setup(smp_processor_id());
#endif
late_time_init = sh_late_time_init;
}
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