arch/arm/cpu/armv8/txl/firmware/bl21/timer.c

/*
 * arch/arm/cpu/armv8/txl/firmware/bl21/timer.c
 *
 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include "io.h"
#include "timer.h"

#define P_ISA_TIMERE                 (volatile unsigned int *)0xc1109988
#define P_EE_TIMER_E		P_ISA_TIMERE

unsigned int get_time(void)
{
	return readl(P_EE_TIMER_E);
}

void _udelay(unsigned int us)
{
#ifndef CONFIG_PXP_EMULATOR
	unsigned int t0 = get_time();

	while (get_time() - t0 <= us)
		;
#endif
}