1 /* SPDX-License-Identifier: BSD-2-Clause */
2 /*
3  * Copyright (c) 2018, Linaro Limited
4  * Copyright (C) 2017, Fuzhou Rockchip Electronics Co., Ltd.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright notice,
11  * this list of conditions and the following disclaimer.
12  *
13  * 2. Redistributions in binary form must reproduce the above copyright notice,
14  * this list of conditions and the following disclaimer in the documentation
15  * and/or other materials provided with the distribution.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
21  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27  * POSSIBILITY OF SUCH DAMAGE.
28  */
29 
30 #ifndef __KERNEL_DELAY_H
31 #define __KERNEL_DELAY_H
32 
33 #include <arm.h>
34 #include <stdbool.h>
35 #include <stdint.h>
36 
37 void udelay(uint32_t us);
38 void mdelay(uint32_t ms);
39 
arm_cnt_us2cnt(uint32_t us)40 static inline uint64_t arm_cnt_us2cnt(uint32_t us)
41 {
42 	return ((uint64_t)us * (uint64_t)read_cntfrq()) / 1000000ULL;
43 }
44 
timeout_init_us(uint32_t us)45 static inline uint64_t timeout_init_us(uint32_t us)
46 {
47 	return barrier_read_counter_timer() + arm_cnt_us2cnt(us);
48 }
49 
timeout_elapsed(uint64_t expire)50 static inline bool timeout_elapsed(uint64_t expire)
51 {
52 	return barrier_read_counter_timer() > expire;
53 }
54 
55 #endif
56