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delay.h
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delay.h
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/* 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
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* 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