time.c

u-boot-1.1.6 源码包

/*
 * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
 * Scott McNutt <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <watchdog.h>


extern void dly_clks( unsigned long ticks );

void udelay(unsigned long usec)
{
	/* The Nios core doesn't have a timebase, so we do our
	 * best for now and call a low-level loop that counts
	 * cpu clocks.
	 */
	unsigned long cnt = (CONFIG_SYS_CLK_FREQ/1000000) * usec;
	WATCHDOG_RESET ();	/* trigger watchdog if needed */
	dly_clks (cnt);
}