Ejemplo n.º 1
0
void __init time_init(void)
{
	time_t sec_o, sec_n = 0;

	/* The platform must provide a function to calibrate the processor
	 * speed for the CALIBRATE.
	 */

#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
	printk("Calibrating CPU frequency ");
	platform_calibrate_ccount();
	printk("%d.%02d MHz\n", (int)ccount_per_jiffy/(1000000/HZ),
			(int)(ccount_per_jiffy/(10000/HZ))%100);
#endif

	/* Set time from RTC (if provided) */

	if (platform_get_rtc_time(&sec_o) == 0)
		while (platform_get_rtc_time(&sec_n))
			if (sec_o != sec_n)
				break;

	xtime.tv_nsec = 0;
	last_rtc_update = xtime.tv_sec = sec_n;
	last_ccount_stamp = get_ccount();

	set_normalized_timespec(&wall_to_monotonic,
		-xtime.tv_sec, -xtime.tv_nsec);

	/* Initialize the linux timer interrupt. */

	setup_irq(LINUX_TIMER_INT, &timer_irqaction);
	set_linux_timer(get_ccount() + CCOUNT_PER_JIFFY);
}
Ejemplo n.º 2
0
irqreturn_t timer_interrupt (int irq, void *dev_id)
{

	unsigned long next;

	next = get_linux_timer();

again:
	while ((signed long)(get_ccount() - next) > 0) {

		profile_tick(CPU_PROFILING);
#ifndef CONFIG_SMP
		update_process_times(user_mode(get_irq_regs()));
#endif

		xtime_update(1); /* Linux handler in kernel/time/timekeeping */

		/* Note that writing CCOMPARE clears the interrupt. */

		next += CCOUNT_PER_JIFFY;
		set_linux_timer(next);
	}

	/* Allow platform to do something useful (Wdog). */

	platform_heartbeat();

	/* Make sure we didn't miss any tick... */

	if ((signed long)(get_ccount() - next) > 0)
		goto again;

	return IRQ_HANDLED;
}
Ejemplo n.º 3
0
irqreturn_t timer_interrupt (int irq, void *dev_id)
{

	unsigned long next;

	next = get_linux_timer();

again:
	while ((signed long)(get_ccount() - next) > 0) {

		profile_tick(CPU_PROFILING);
#ifndef CONFIG_SMP
		update_process_times(user_mode(get_irq_regs()));
#endif

		xtime_update(1); /*                                          */

		/*                                                  */

		next += CCOUNT_PER_JIFFY;
		set_linux_timer(next);
	}

	/*                                               */

	platform_heartbeat();

	/*                                      */

	if ((signed long)(get_ccount() - next) > 0)
		goto again;

	return IRQ_HANDLED;
}
Ejemplo n.º 4
0
irqreturn_t timer_interrupt (int irq, void *dev_id)
{

	unsigned long next;

	next = get_linux_timer();

again:
	while ((signed long)(get_ccount() - next) > 0) {

		profile_tick(CPU_PROFILING);
#ifndef CONFIG_SMP
		update_process_times(user_mode(get_irq_regs()));
#endif

		write_seqlock(&xtime_lock);

		last_ccount_stamp = next;
		next += CCOUNT_PER_JIFFY;
		do_timer (1); /* Linux handler in kernel/timer.c */

		if (ntp_synced() &&
		    xtime.tv_sec - last_rtc_update >= 659 &&
		    abs((xtime.tv_nsec/1000)-(1000000-1000000/HZ))<5000000/HZ) {

			if (platform_set_rtc_time(xtime.tv_sec+1) == 0)
				last_rtc_update = xtime.tv_sec+1;
			else
				/* Do it again in 60 s */
				last_rtc_update += 60;
		}
		write_sequnlock(&xtime_lock);
	}

	/* NOTE: writing CCOMPAREn clears the interrupt.  */

	set_linux_timer (next);

	/* Make sure we didn't miss any tick... */

	if ((signed long)(get_ccount() - next) > 0)
		goto again;

	/* Allow platform to do something useful (Wdog). */

	platform_heartbeat();

	return IRQ_HANDLED;
}
Ejemplo n.º 5
0
static int ccount_timer_set_next_event(unsigned long delta,
		struct clock_event_device *dev)
{
	unsigned long flags, next;
	int ret = 0;

	local_irq_save(flags);
	next = get_ccount() + delta;
	set_linux_timer(next);
	if (next - get_ccount() > delta)
		ret = -ETIME;
	local_irq_restore(flags);

	return ret;
}
Ejemplo n.º 6
0
int do_settimeofday(struct timespec *tv)
{
	time_t wtm_sec, sec = tv->tv_sec;
	long wtm_nsec, nsec = tv->tv_nsec;
	unsigned long ccount;

	if ((unsigned long)tv->tv_nsec >= NSEC_PER_SEC)
		return -EINVAL;

	write_seqlock_irq(&xtime_lock);

	/* This is revolting. We need to set "xtime" correctly. However, the
	 * value in this location is the value at the most recent update of
	 * wall time.  Discover what correction gettimeofday() would have
	 * made, and then undo it!
	 */
	ccount = get_ccount();
	nsec -= (ccount - last_ccount_stamp) * CCOUNT_NSEC;

	wtm_sec  = wall_to_monotonic.tv_sec + (xtime.tv_sec - sec);
	wtm_nsec = wall_to_monotonic.tv_nsec + (xtime.tv_nsec - nsec);

	set_normalized_timespec(&xtime, sec, nsec);
	set_normalized_timespec(&wall_to_monotonic, wtm_sec, wtm_nsec);

	ntp_clear();
	write_sequnlock_irq(&xtime_lock);
	return 0;
}
Ejemplo n.º 7
0
Archivo: smp.c Proyecto: 24hours/linux
static int boot_secondary(unsigned int cpu, struct task_struct *ts)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	unsigned long ccount;
	int i;

#ifdef CONFIG_HOTPLUG_CPU
	cpu_start_id = cpu;
	system_flush_invalidate_dcache_range(
			(unsigned long)&cpu_start_id, sizeof(cpu_start_id));
#endif
	smp_call_function_single(0, mx_cpu_start, (void *)cpu, 1);

	for (i = 0; i < 2; ++i) {
		do
			ccount = get_ccount();
		while (!ccount);

		cpu_start_ccount = ccount;

		while (time_before(jiffies, timeout)) {
			mb();
			if (!cpu_start_ccount)
				break;
		}

		if (cpu_start_ccount) {
			smp_call_function_single(0, mx_cpu_stop,
					(void *)cpu, 1);
			cpu_start_ccount = 0;
			return -EIO;
		}
	}
	return 0;
}
Ejemplo n.º 8
0
void __init time_init(void)
{
#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
	printk("Calibrating CPU frequency ");
	platform_calibrate_ccount();
	printk("%d.%02d MHz\n", (int)ccount_per_jiffy/(1000000/HZ),
			(int)(ccount_per_jiffy/(10000/HZ))%100);
#endif
	clocksource_register_hz(&ccount_clocksource, CCOUNT_PER_JIFFY * HZ);

	/* Initialize the linux timer interrupt. */

	setup_irq(LINUX_TIMER_INT, &timer_irqaction);
	set_linux_timer(get_ccount() + CCOUNT_PER_JIFFY);
}
Ejemplo n.º 9
0
void do_gettimeofday(struct timeval *tv)
{
	unsigned long flags;
	unsigned long sec, usec, delta, seq;

	do {
		seq = read_seqbegin_irqsave(&xtime_lock, flags);

		delta = get_ccount() - last_ccount_stamp;
		sec = xtime.tv_sec;
		usec = (xtime.tv_nsec / NSEC_PER_USEC);
	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));

	usec += (delta * CCOUNT_NSEC) / NSEC_PER_USEC;
	for (; usec >= 1000000; sec++, usec -= 1000000)
		;

	tv->tv_sec = sec;
	tv->tv_usec = usec;
}
Ejemplo n.º 10
0
static int boot_secondary(unsigned int cpu, struct task_struct *ts)
{
	unsigned long timeout = jiffies + msecs_to_jiffies(1000);
	unsigned long ccount;
	int i;

#ifdef CONFIG_HOTPLUG_CPU
	WRITE_ONCE(cpu_start_id, cpu);
	/* Pairs with the third memw in the cpu_restart */
	mb();
	system_flush_invalidate_dcache_range((unsigned long)&cpu_start_id,
					     sizeof(cpu_start_id));
#endif
	smp_call_function_single(0, mx_cpu_start, (void *)cpu, 1);

	for (i = 0; i < 2; ++i) {
		do
			ccount = get_ccount();
		while (!ccount);

		WRITE_ONCE(cpu_start_ccount, ccount);

		do {
			/*
			 * Pairs with the first two memws in the
			 * .Lboot_secondary.
			 */
			mb();
			ccount = READ_ONCE(cpu_start_ccount);
		} while (ccount && time_before(jiffies, timeout));

		if (ccount) {
			smp_call_function_single(0, mx_cpu_stop,
						 (void *)cpu, 1);
			WRITE_ONCE(cpu_start_ccount, 0);
			return -EIO;
		}
	}
	return 0;
}
Ejemplo n.º 11
0
void __init time_init(void)
{
	/* FIXME: xtime&wall_to_monotonic are set in timekeeping_init. */
	read_persistent_clock(&xtime);
	set_normalized_timespec(&wall_to_monotonic,
		-xtime.tv_sec, -xtime.tv_nsec);

#ifdef CONFIG_XTENSA_CALIBRATE_CCOUNT
	printk("Calibrating CPU frequency ");
	platform_calibrate_ccount();
	printk("%d.%02d MHz\n", (int)ccount_per_jiffy/(1000000/HZ),
			(int)(ccount_per_jiffy/(10000/HZ))%100);
#endif
	ccount_clocksource.mult =
		clocksource_hz2mult(CCOUNT_PER_JIFFY * HZ,
				ccount_clocksource.shift);
	clocksource_register(&ccount_clocksource);

	/* Initialize the linux timer interrupt. */

	setup_irq(LINUX_TIMER_INT, &timer_irqaction);
	set_linux_timer(get_ccount() + CCOUNT_PER_JIFFY);
}
Ejemplo n.º 12
0
void do_gettimeofday(struct timeval *tv)
{
	unsigned long flags;
	unsigned long volatile sec, usec, delta, seq;

	do {
		seq = read_seqbegin_irqsave(&xtime_lock, flags);

		sec = xtime.tv_sec;
		usec = (xtime.tv_nsec / NSEC_PER_USEC);

		delta = get_linux_timer() - get_ccount();

	} while (read_seqretry_irqrestore(&xtime_lock, seq, flags));

	usec += (((unsigned long) CCOUNT_PER_JIFFY - delta)
		 * (unsigned long) NSEC_PER_CCOUNT) / NSEC_PER_USEC;

	for (; usec >= 1000000; sec++, usec -= 1000000)
		;

	tv->tv_sec = sec;
	tv->tv_usec = usec;
}
Ejemplo n.º 13
0
static cycle_t ccount_read(void)
{
	return (cycle_t)get_ccount();
}
Ejemplo n.º 14
0
static u64 notrace ccount_sched_clock_read(void)
{
	return get_ccount();
}
Ejemplo n.º 15
0
static cycle_t ccount_read(struct clocksource *cs)
{
	return (cycle_t)get_ccount();
}