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 <kernel/delay_arch.h> 34 #include <stdbool.h> 35 #include <stdint.h> 36 #include <util.h> 37 38 #ifdef CFG_CORE_HAS_GENERIC_TIMER 39 /* Convert microsecond base delay @us into architecture time tick counts */ 40 static inline uint64_t delay_us2cnt(uint32_t us) 41 { 42 return ((uint64_t)us * (uint64_t)delay_cnt_freq()) / ULL(1000000); 43 } 44 45 /* Return delay tick counter for a timeout expiration in @us microseconds */ 46 static inline uint64_t timeout_init_us(uint32_t us) 47 { 48 return delay_cnt_read() + delay_us2cnt(us); 49 } 50 51 /* Check if timeout tick counter @expire from timeout_init_us() has expired */ 52 53 static inline bool timeout_elapsed(uint64_t expire) 54 { 55 return delay_cnt_read() >= expire; 56 } 57 58 /* 59 * Return the time in microseconds since/until timeout tick counter @expired, 60 * that was initialized with timeout_init_us() or like, has/will expire. 61 * A positive value means the timeout has expired and a negative one it has not. 62 */ 63 int timeout_elapsed_us(uint64_t expire); 64 #endif /*CFG_CORE_HAS_GENERIC_TIMER*/ 65 66 /* Wait @us microseconds actively polling on architecture timer */ 67 void udelay(uint32_t us); 68 69 /* Wait @ms milliseconds actively polling on architecture timer */ 70 void mdelay(uint32_t ms); 71 #endif 72