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 #include <kernel/boot.h> 31 #include <kernel/delay.h> 32 #include <kernel/misc.h> 33 34 #ifdef CFG_CORE_HAS_GENERIC_TIMER 35 void udelay(uint32_t us) 36 { 37 uint64_t target = timeout_init_us(us); 38 39 while (!timeout_elapsed(target)) 40 ; 41 } 42 #else 43 44 void udelay(uint32_t us) 45 { 46 uint64_t cycles = 0; 47 uint32_t cycles_to_wait = 0; 48 49 cycles = (uint64_t)us * ((uint64_t)plat_get_freq() / 1000000ULL); 50 51 while (cycles) { 52 cycles_to_wait = MIN(cycles, UINT32_MAX); 53 wait_cycles(cycles_to_wait); 54 cycles -= cycles_to_wait; 55 } 56 } 57 #endif 58 59 void mdelay(uint32_t ms) 60 { 61 udelay(1000 * ms); 62 } 63