/* * 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 8extern 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;	timer_irq.flags = SA_INTERRUPT; /* FIXME: really? */	setup_arm_irq(IRQ_TIMER, &timer_irq);}