timer.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 36 行

/*
 * linux/arch/ia64/sn/kernel/sn2/timer.c
 *
 * Copyright (C) 2003 Silicon Graphics, Inc.
 * Copyright (C) 2003 Hewlett-Packard Co
 *	David Mosberger <[e-mail]>: updated for new timer-interpolation infrastructure
 */

#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/time.h>
#include <linux/interrupt.h>

#include <asm/hw_irq.h>
#include <asm/system.h>

#include <asm/sn/leds.h>
#include <asm/sn/clksupport.h>


extern unsigned long sn_rtc_cycles_per_second;

static struct time_interpolator sn2_interpolator;

void __init
sn_timer_init(void)
{
	sn2_interpolator.frequency = sn_rtc_cycles_per_second;
	sn2_interpolator.drift = -1;	/* unknown */
	sn2_interpolator.shift = 10;	/* RTC is 54 bits maximum shift is 10 */
	sn2_interpolator.addr = RTC_COUNTER_ADDR;
	sn2_interpolator.source = TIME_SOURCE_MMIO64;
	register_time_interpolator(&sn2_interpolator);
}