1*91f16700Schasinglulu /* 2*91f16700Schasinglulu * Copyright (c) 2018-2020, Renesas Electronics Corporation. All rights reserved. 3*91f16700Schasinglulu * 4*91f16700Schasinglulu * SPDX-License-Identifier: BSD-3-Clause 5*91f16700Schasinglulu */ 6*91f16700Schasinglulu 7*91f16700Schasinglulu #include <arch.h> 8*91f16700Schasinglulu #include <arch_helpers.h> 9*91f16700Schasinglulu 10*91f16700Schasinglulu #include "micro_delay.h" 11*91f16700Schasinglulu 12*91f16700Schasinglulu #define RCAR_CONV_MICROSEC 1000000U 13*91f16700Schasinglulu 14*91f16700Schasinglulu void 15*91f16700Schasinglulu #if IMAGE_BL31 16*91f16700Schasinglulu __attribute__ ((section(".system_ram"))) 17*91f16700Schasinglulu #endif 18*91f16700Schasinglulu rcar_micro_delay(uint64_t micro_sec) 19*91f16700Schasinglulu { 20*91f16700Schasinglulu uint64_t freq; 21*91f16700Schasinglulu uint64_t base_count; 22*91f16700Schasinglulu uint64_t get_count; 23*91f16700Schasinglulu uint64_t wait_time = 0U; 24*91f16700Schasinglulu 25*91f16700Schasinglulu freq = read_cntfrq_el0(); 26*91f16700Schasinglulu base_count = read_cntpct_el0(); 27*91f16700Schasinglulu while (micro_sec > wait_time) { 28*91f16700Schasinglulu get_count = read_cntpct_el0(); 29*91f16700Schasinglulu wait_time = ((get_count - base_count) * RCAR_CONV_MICROSEC) / freq; 30*91f16700Schasinglulu } 31*91f16700Schasinglulu } 32