blob: 797ce05aa698ea27532fc89795ef443f626f6268 [file] [log] [blame]
Tony Xief6118cc2016-01-15 17:17:32 +08001/*
2 * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * Redistributions of source code must retain the above copyright notice, this
8 * list of conditions and the following disclaimer.
9 *
10 * Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 *
14 * Neither the name of ARM nor the names of its contributors may be used
15 * to endorse or promote products derived from this software without specific
16 * prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <arch_helpers.h>
32#include <delay_timer.h>
33#include <platform_def.h>
34
35static uint32_t plat_get_timer_value(void)
36{
37 /*
38 * Generic delay timer implementation expects the timer to be a down
39 * counter. We apply bitwise NOT operator to the tick values returned
40 * by read_cntpct_el0() to simulate the down counter.
41 */
42 return (uint32_t)(~read_cntpct_el0());
43}
44
45static const timer_ops_t plat_timer_ops = {
46 .get_timer_value = plat_get_timer_value,
47 .clk_mult = 1,
48 .clk_div = SYS_COUNTER_FREQ_IN_MHZ,
49};
50
51void plat_delay_timer_init(void)
52{
53 timer_init(&plat_timer_ops);
54}