1 | // SPDX-License-Identifier: GPL-2.0 |
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2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
3 | #include <linux/kernel.h> |
4 | #include <linux/module.h> |
5 | #include <linux/init.h> |
6 | #include <linux/delay.h> |
7 | |
8 | void __aligned(8) __delay(unsigned long loops) |
9 | { |
10 | asm volatile ( |
11 | "mov r0, r0\n" |
12 | "1:declt %0\n" |
13 | "bf 1b" |
14 | : "=r"(loops) |
15 | : "0"(loops)); |
16 | } |
17 | EXPORT_SYMBOL(__delay); |
18 | |
19 | void __const_udelay(unsigned long xloops) |
20 | { |
21 | unsigned long long loops; |
22 | |
23 | loops = (unsigned long long)xloops * loops_per_jiffy * HZ; |
24 | |
25 | __delay(loops >> 32); |
26 | } |
27 | EXPORT_SYMBOL(__const_udelay); |
28 | |
29 | void __udelay(unsigned long usecs) |
30 | { |
31 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ |
32 | } |
33 | EXPORT_SYMBOL(__udelay); |
34 | |
35 | void __ndelay(unsigned long nsecs) |
36 | { |
37 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ |
38 | } |
39 | EXPORT_SYMBOL(__ndelay); |
40 |