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/*
* linux/arch/arm/mach-epxa10db/time.c
*
* Copyright (C) 2000 Deep Blue Solutions
* Copyright (C) 2001 Altera Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <asm/hardware.h>
#include <asm/system.h>
#include <asm/leds.h>
#include <asm/mach/time.h>
#define TIMER00_TYPE (volatile unsigned int*)
#include <asm/arch/timer00.h>
static int epxa10db_set_rtc(void)
{
return 1;
}
static int epxa10db_rtc_init(void)
{
set_rtc = epxa10db_set_rtc;
return 0;
}
__initcall(epxa10db_rtc_init);
/*
* IRQ handler for the timer
*/
static irqreturn_t
epxa10db_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
write_seqlock(&xtime_lock);
// ...clear the interrupt
*TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))|=TIMER0_CR_CI_MSK;
timer_tick(regs);
write_sequnlock(&xtime_lock);
return IRQ_HANDLED;
}
static struct irqaction epxa10db_timer_irq = {
.name = "Excalibur Timer Tick",
.flags = SA_INTERRUPT | SA_TIMER,
.handler = epxa10db_timer_interrupt,
};
/*
* Set up timer interrupt, and return the current time in seconds.
*/
static void __init epxa10db_timer_init(void)
{
/* Start the timer */
*TIMER0_LIMIT(IO_ADDRESS(EXC_TIMER00_BASE))=(unsigned int)(EXC_AHB2_CLK_FREQUENCY/200);
*TIMER0_PRESCALE(IO_ADDRESS(EXC_TIMER00_BASE))=1;
*TIMER0_CR(IO_ADDRESS(EXC_TIMER00_BASE))=TIMER0_CR_IE_MSK | TIMER0_CR_S_MSK;
setup_irq(IRQ_TIMER0, &epxa10db_timer_irq);
}
struct sys_timer epxa10db_timer = {
.init = epxa10db_timer_init,
};
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