time.c

来自「U-boot源码 ARM7启动代码」· C语言 代码 · 共 43 行

/*
 * (C) Copyright 2007 Michal Simek
 * (C) Copyright 2004 Atmark Techno, Inc.
 *
 * Michal  SIMEK <[e-mail]>
 * Yasushi SHOJI <[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>

#ifdef CFG_TIMER_0
void udelay (unsigned long usec)
{
	int i;
	i = get_timer (0);
	while ((get_timer (0) - i) < (usec / 1000)) ;
}
#else
void udelay (unsigned long usec)
{
	unsigned int i;
	for (i = 0; i < (usec * CONFIG_XILINX_CLOCK_FREQ / 10000000); i++);
}
#endif