forked from Minki/linux
15f304b664
Move them to drivers/clocksource/i8253.c and remove the implementations in arch/ [ tglx: Avoid the extra file in lib - folded arch patches in. The export will become conditional in a later step ] Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Link: http://lkml.kernel.org/r/20110601180610.221426078@duck.linux-mips.net Cc: Russell King <linux@arm.linux.org.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
94 lines
2.0 KiB
C
94 lines
2.0 KiB
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/i8253.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/mach/time.h>
|
|
|
|
#include "common.h"
|
|
|
|
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,
|
|
};
|