core/arch/arm/include/kernel/delay.h

/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (c) 2018, Linaro Limited
 * Copyright (C) 2017, Fuzhou Rockchip Electronics Co., Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __KERNEL_DELAY_H
#define __KERNEL_DELAY_H

#include <arm.h>
#include <stdbool.h>
#include <stdint.h>

void udelay(uint32_t us);
void mdelay(uint32_t ms);

static inline uint64_t arm_cnt_us2cnt(uint32_t us)
{
	return ((uint64_t)us * (uint64_t)read_cntfrq()) / 1000000ULL;
}

static inline uint64_t timeout_init_us(uint32_t us)
{
	return read_cntpct() + arm_cnt_us2cnt(us);
}

static inline bool timeout_elapsed(uint64_t expire)
{
	return read_cntpct() > expire;
}

#endif