1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2018, Linaro Limited
* Copyright (C) 2017, Fuzhou Rockchip Electronics Co., Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <kernel/boot.h>
#include <kernel/delay.h>
#include <kernel/misc.h>
#ifdef CFG_CORE_HAS_GENERIC_TIMER
int timeout_elapsed_us(uint64_t expire)
{
int64_t diff = delay_cnt_read() - expire;
if (MUL_OVERFLOW(diff, 1000000, &diff) ||
diff < INT_MIN || diff > INT_MAX) {
if (timeout_elapsed(expire))
return INT_MAX;
else
return INT_MIN;
}
return diff / delay_cnt_freq();
}
void udelay(uint32_t us)
{
uint64_t target = timeout_init_us(us);
while (!timeout_elapsed(target))
;
}
#else
void udelay(uint32_t us)
{
uint64_t cycles = 0;
uint32_t cycles_to_wait = 0;
cycles = (uint64_t)us * ((uint64_t)plat_get_freq() / 1000000ULL);
while (cycles) {
cycles_to_wait = MIN(cycles, UINT32_MAX);
wait_cycles(cycles_to_wait);
cycles -= cycles_to_wait;
}
}
#endif
void mdelay(uint32_t ms)
{
udelay(1000 * ms);
}
|
