1 /* 2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <arch_helpers.h> 8 #include <delay_timer.h> 9 #include <platform_def.h> 10 11 static uint32_t plat_get_timer_value(void) 12 { 13 /* 14 * Generic delay timer implementation expects the timer to be a down 15 * counter. We apply bitwise NOT operator to the tick values returned 16 * by read_cntpct_el0() to simulate the down counter. 17 */ 18 return (uint32_t)(~read_cntpct_el0()); 19 } 20 21 static const timer_ops_t plat_timer_ops = { 22 .get_timer_value = plat_get_timer_value, 23 .clk_mult = 1, 24 .clk_div = SYS_COUNTER_FREQ_IN_MHZ, 25 }; 26 27 void plat_delay_timer_init(void) 28 { 29 timer_init(&plat_timer_ops); 30 } 31
