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Sourcecode: linux-2.6 version File versions

dc21285-timer.c

/*
 *  linux/arch/arm/mach-footbridge/dc21285-timer.c
 *
 *  Copyright (C) 1998 Russell King.
 *  Copyright (C) 1998 Phil Blundell
 */
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>

#include <asm/irq.h>

#include <asm/hardware/dec21285.h>
#include <asm/mach/time.h>

#include "common.h"

/*
 * Footbridge timer 1 support.
 */
static unsigned long timer1_latch;

static unsigned long timer1_gettimeoffset (void)
{
      unsigned long value = timer1_latch - *CSR_TIMER1_VALUE;

      return ((tick_nsec / 1000) * value) / timer1_latch;
}

static irqreturn_t
timer1_interrupt(int irq, void *dev_id)
{
      *CSR_TIMER1_CLR = 0;

      timer_tick();

      return IRQ_HANDLED;
}

static struct irqaction footbridge_timer_irq = {
      .name       = "Timer1 timer tick",
      .handler    = timer1_interrupt,
      .flags            = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
};

/*
 * Set up timer interrupt.
 */
static void __init footbridge_timer_init(void)
{
      timer1_latch = (mem_fclk_21285 + 8 * HZ) / (16 * HZ);

      *CSR_TIMER1_CLR  = 0;
      *CSR_TIMER1_LOAD = timer1_latch;
      *CSR_TIMER1_CNTL = TIMER_CNTL_ENABLE | TIMER_CNTL_AUTORELOAD | TIMER_CNTL_DIV16;

      setup_irq(IRQ_TIMER1, &footbridge_timer_irq);

      isa_rtc_init();
}

struct sys_timer footbridge_timer = {
      .init       = footbridge_timer_init,
      .offset           = timer1_gettimeoffset,
};

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