/* *  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 <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_ttimer1_interrupt(int irq, void *dev_id, struct pt_regs *regs){	write_seqlock(&xtime_lock);	*CSR_TIMER1_CLR = 0;	timer_tick(regs);	write_sequnlock(&xtime_lock);	return IRQ_HANDLED;}static struct irqaction footbridge_timer_irq = {	.name		= "Timer1 timer tick",	.handler	= timer1_interrupt,	.flags		= SA_INTERRUPT | SA_TIMER,};/* * 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,};