mirror of https://gitee.com/openkylin/linux.git
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/* MN10300 clockevents
|
|
*
|
|
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
|
|
* Written by Mark Salter (msalter@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#include <linux/clockchips.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/smp.h>
|
|
#include <asm/timex.h>
|
|
#include "internal.h"
|
|
|
|
#ifdef CONFIG_SMP
|
|
#if (CONFIG_NR_CPUS > 2) && !defined(CONFIG_GEENERIC_CLOCKEVENTS_BROADCAST)
|
|
#error "This doesn't scale well! Need per-core local timers."
|
|
#endif
|
|
#else /* CONFIG_SMP */
|
|
#define stop_jiffies_counter1()
|
|
#define reload_jiffies_counter1(x)
|
|
#define TMJC1IRQ TMJCIRQ
|
|
#endif
|
|
|
|
|
|
static int next_event(unsigned long delta,
|
|
struct clock_event_device *evt)
|
|
{
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
if (cpu == 0) {
|
|
stop_jiffies_counter();
|
|
reload_jiffies_counter(delta - 1);
|
|
} else {
|
|
stop_jiffies_counter1();
|
|
reload_jiffies_counter1(delta - 1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void set_clock_mode(enum clock_event_mode mode,
|
|
struct clock_event_device *evt)
|
|
{
|
|
/* Nothing to do ... */
|
|
}
|
|
|
|
static DEFINE_PER_CPU(struct clock_event_device, mn10300_clockevent_device);
|
|
static DEFINE_PER_CPU(struct irqaction, timer_irq);
|
|
|
|
static irqreturn_t timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct clock_event_device *cd;
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
if (cpu == 0)
|
|
stop_jiffies_counter();
|
|
else
|
|
stop_jiffies_counter1();
|
|
|
|
cd = &per_cpu(mn10300_clockevent_device, cpu);
|
|
cd->event_handler(cd);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void event_handler(struct clock_event_device *dev)
|
|
{
|
|
}
|
|
|
|
int __init init_clockevents(void)
|
|
{
|
|
struct clock_event_device *cd;
|
|
struct irqaction *iact;
|
|
unsigned int cpu = smp_processor_id();
|
|
|
|
cd = &per_cpu(mn10300_clockevent_device, cpu);
|
|
|
|
if (cpu == 0) {
|
|
stop_jiffies_counter();
|
|
cd->irq = TMJCIRQ;
|
|
} else {
|
|
stop_jiffies_counter1();
|
|
cd->irq = TMJC1IRQ;
|
|
}
|
|
|
|
cd->name = "Timestamp";
|
|
cd->features = CLOCK_EVT_FEAT_ONESHOT;
|
|
|
|
/* Calculate shift/mult. We want to spawn at least 1 second */
|
|
clockevents_calc_mult_shift(cd, MN10300_JCCLK, 1);
|
|
|
|
/* Calculate the min / max delta */
|
|
cd->max_delta_ns = clockevent_delta2ns(TMJCBR_MAX, cd);
|
|
cd->min_delta_ns = clockevent_delta2ns(100, cd);
|
|
|
|
cd->rating = 200;
|
|
cd->cpumask = cpumask_of(smp_processor_id());
|
|
cd->set_mode = set_clock_mode;
|
|
cd->event_handler = event_handler;
|
|
cd->set_next_event = next_event;
|
|
|
|
iact = &per_cpu(timer_irq, cpu);
|
|
iact->flags = IRQF_DISABLED | IRQF_SHARED | IRQF_TIMER;
|
|
iact->handler = timer_interrupt;
|
|
|
|
clockevents_register_device(cd);
|
|
|
|
#if defined(CONFIG_SMP) && !defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST)
|
|
/* setup timer irq affinity so it only runs on this cpu */
|
|
{
|
|
struct irq_data *data;
|
|
data = irq_get_irq_data(cd->irq);
|
|
cpumask_copy(data->affinity, cpumask_of(cpu));
|
|
iact->flags |= IRQF_NOBALANCING;
|
|
}
|
|
#endif
|
|
|
|
if (cpu == 0) {
|
|
reload_jiffies_counter(MN10300_JC_PER_HZ - 1);
|
|
iact->name = "CPU0 Timer";
|
|
} else {
|
|
reload_jiffies_counter1(MN10300_JC_PER_HZ - 1);
|
|
iact->name = "CPU1 Timer";
|
|
}
|
|
|
|
setup_jiffies_interrupt(cd->irq, iact);
|
|
|
|
return 0;
|
|
}
|