https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 59c5f46fbe01a00eedf54a23789634438bb80603 authored by Linus Torvalds on 06 June 2011, 09:06:33 UTC
Linux 3.0-rc2
Linux 3.0-rc2
Tip revision: 59c5f46
isa-timer.c
/*
* linux/arch/arm/mach-footbridge/isa-timer.c
*
* Copyright (C) 1998 Russell King.
* Copyright (C) 1998 Phil Blundell
*/
#include <linux/clockchips.h>
#include <linux/clocksource.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/spinlock.h>
#include <linux/timex.h>
#include <asm/irq.h>
#include <asm/i8253.h>
#include <asm/mach/time.h>
#include "common.h"
DEFINE_RAW_SPINLOCK(i8253_lock);
static void pit_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
unsigned long flags;
raw_local_irq_save(flags);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
outb_p(0x34, PIT_MODE);
outb_p(PIT_LATCH & 0xff, PIT_CH0);
outb_p(PIT_LATCH >> 8, PIT_CH0);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
outb_p(0x30, PIT_MODE);
outb_p(0, PIT_CH0);
outb_p(0, PIT_CH0);
break;
case CLOCK_EVT_MODE_ONESHOT:
case CLOCK_EVT_MODE_RESUME:
break;
}
local_irq_restore(flags);
}
static int pit_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
return 0;
}
static struct clock_event_device pit_ce = {
.name = "pit",
.features = CLOCK_EVT_FEAT_PERIODIC,
.set_mode = pit_set_mode,
.set_next_event = pit_set_next_event,
.shift = 32,
};
static irqreturn_t pit_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *ce = dev_id;
ce->event_handler(ce);
return IRQ_HANDLED;
}
static struct irqaction pit_timer_irq = {
.name = "pit",
.handler = pit_timer_interrupt,
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.dev_id = &pit_ce,
};
static void __init isa_timer_init(void)
{
pit_ce.cpumask = cpumask_of(smp_processor_id());
pit_ce.mult = div_sc(PIT_TICK_RATE, NSEC_PER_SEC, pit_ce.shift);
pit_ce.max_delta_ns = clockevent_delta2ns(0x7fff, &pit_ce);
pit_ce.min_delta_ns = clockevent_delta2ns(0x000f, &pit_ce);
clocksource_i8253_init();
setup_irq(pit_ce.irq, &pit_timer_irq);
clockevents_register_device(&pit_ce);
}
struct sys_timer isa_timer = {
.init = isa_timer_init,
};