1 /*
2 *
3 * Copyright 2016 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * Alternatively, this software may be distributed under the terms of the
17 * GNU General Public License ("GPL") version 2 as published by the Free
18 * Software Foundation.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <assert.h>
34 #include <libpayload.h>
35
timer_hz(void)36 uint64_t timer_hz(void)
37 {
38 return CONFIG_LP_TIMER_GENERIC_HZ;
39 }
40
timer_raw_value(void)41 uint64_t timer_raw_value(void)
42 {
43 uint64_t cur_tick;
44 uint32_t count_h;
45 uint32_t count_l;
46
47 if (!CONFIG_LP_TIMER_GENERIC_HIGH_REG)
48 return readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
49
50 do {
51 count_h = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_HIGH_REG));
52 count_l = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_REG));
53 cur_tick = readl(phys_to_virt(CONFIG_LP_TIMER_GENERIC_HIGH_REG));
54 } while (cur_tick != count_h);
55
56 return (cur_tick << 32) + count_l;
57 }
58