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caab277b | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4182de9e | 2 | /* Copyright Altera Corporation (C) 2014. All rights reserved. |
4182de9e LFT |
3 | */ |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <asm/delay.h> | |
7 | #include <asm/param.h> | |
8 | #include <asm/processor.h> | |
9 | #include <asm/timex.h> | |
10 | ||
11 | void __delay(unsigned long cycles) | |
12 | { | |
13 | cycles_t start = get_cycles(); | |
14 | ||
15 | while ((get_cycles() - start) < cycles) | |
16 | cpu_relax(); | |
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); |