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