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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
a71a29de YS |
2 | /* |
3 | * delay loops | |
4 | * | |
5 | * Copyright (C) 2015 Yoshinori Sato | |
6 | */ | |
7 | ||
8 | #include <linux/module.h> | |
9 | #include <linux/delay.h> | |
10 | #include <asm/param.h> | |
11 | #include <asm/processor.h> | |
12 | #include <asm/timex.h> | |
13 | ||
14 | void __delay(unsigned long cycles) | |
15 | { | |
16 | __asm__ volatile ("1: dec.l #1,%0\n\t" | |
17 | "bne 1b":"=r"(cycles):"0"(cycles)); | |
18 | } | |
19 | EXPORT_SYMBOL(__delay); | |
20 | ||
21 | void __const_udelay(unsigned long xloops) | |
22 | { | |
23 | u64 loops; | |
24 | ||
25 | loops = (u64)xloops * loops_per_jiffy * HZ; | |
26 | ||
27 | __delay(loops >> 32); | |
28 | } | |
29 | EXPORT_SYMBOL(__const_udelay); | |
30 | ||
31 | void __udelay(unsigned long usecs) | |
32 | { | |
33 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ | |
34 | } | |
35 | EXPORT_SYMBOL(__udelay); | |
36 | ||
37 | void __ndelay(unsigned long nsecs) | |
38 | { | |
39 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ | |
40 | } | |
41 | EXPORT_SYMBOL(__ndelay); |