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/*

 * linux/include/asm-arm/arch-shark/time.h

 *

 * by Alexander Schulz

 *

 * Uses the real time clock because you can't run

 * the timer with level triggered interrupts and

 * you can't run the shark with edge triggered

 * inetrrupts (loses ints and hangs).

 *

 * derived from linux/drivers/char/rtc.c and:

 * linux/include/asm-arm/arch-ebsa110/time.h

 * Copyright (c) 1996,1997,1998 Russell King.

 */

#include <asm/leds.h>

#include <linux/mc146818rtc.h>

#define IRQ_TIMER 8

extern void get_rtc_time(struct rtc_time *rtc_tm);

extern void set_rtc_irq_bit(unsigned char bit);

extern unsigned long epoch;

static void timer_interrupt(int irq, void *dev_id, struct pt_regs *regs)

{

        CMOS_READ(RTC_INTR_FLAGS);

        do_leds();

        {

#ifdef DIVISOR

                static unsigned int divisor;

                if (divisor-- == 0) {

                        divisor = DIVISOR - 1;

#else

                {

#endif

                        do_timer(regs);

                }

        }

}

/*

 * Set up timer interrupt, and return the current time in seconds.

 */

static inline void setup_timer(void)

{

        struct rtc_time r_time;

        unsigned long flags;

        int tmp = 0;

        unsigned char val;

        /*

         * Set the clock to 128 Hz, we already have a valid

         * vector now:

         */

        while (HZ > (1<<tmp))

          tmp++;

        /*

         * Check that the input was really a power of 2.

         */

        if (HZ != (1<<tmp))

          panic("Please set HZ to a power of 2!");

        save_flags(flags);

        cli();

        val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;

        val |= (16 - tmp);

        CMOS_WRITE(val, RTC_FREQ_SELECT);

        restore_flags(flags);

        set_rtc_irq_bit(RTC_PIE);

        get_rtc_time(&r_time);

        xtime.tv_sec = mktime(r_time.tm_year+epoch, r_time.tm_mon+1, r_time.tm_mday,

                              r_time.tm_hour, r_time.tm_min, r_time.tm_sec);

        timer_irq.handler = timer_interrupt;

        setup_arm_irq(IRQ_TIMER, &timer_irq);

}