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 
plat_get_timer_value(void)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 
plat_delay_timer_init(void)27 void plat_delay_timer_init(void)
28 {
29 	timer_init(&plat_timer_ops);
30 }
31