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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
224cd129 JB |
2 | /* |
3 | * OpenRISC Linux | |
4 | * | |
5 | * Linux architectural port borrowing liberally from similar works of | |
6 | * others. All original copyrights apply as per the original source | |
7 | * declaration. | |
8 | * | |
9 | * Modifications for the OpenRISC architecture: | |
10 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> | |
11 | * | |
224cd129 JB |
12 | * Precise Delay Loops |
13 | */ | |
14 | ||
15 | #include <linux/kernel.h> | |
1938852d | 16 | #include <linux/export.h> |
224cd129 | 17 | #include <linux/init.h> |
1938852d | 18 | #include <asm/param.h> |
224cd129 JB |
19 | #include <asm/delay.h> |
20 | #include <asm/timex.h> | |
21 | #include <asm/processor.h> | |
22 | ||
b881bc46 | 23 | int read_current_timer(unsigned long *timer_value) |
224cd129 | 24 | { |
8e6d08e0 | 25 | *timer_value = get_cycles(); |
224cd129 JB |
26 | return 0; |
27 | } | |
28 | ||
29 | void __delay(unsigned long cycles) | |
30 | { | |
807607f7 | 31 | cycles_t start = get_cycles(); |
224cd129 | 32 | |
807607f7 | 33 | while ((get_cycles() - start) < cycles) |
224cd129 JB |
34 | cpu_relax(); |
35 | } | |
36 | EXPORT_SYMBOL(__delay); | |
37 | ||
38 | inline void __const_udelay(unsigned long xloops) | |
39 | { | |
40 | unsigned long long loops; | |
41 | ||
43916466 | 42 | loops = (unsigned long long)xloops * loops_per_jiffy * HZ; |
224cd129 JB |
43 | |
44 | __delay(loops >> 32); | |
45 | } | |
46 | EXPORT_SYMBOL(__const_udelay); | |
47 | ||
48 | void __udelay(unsigned long usecs) | |
49 | { | |
50 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ | |
51 | } | |
52 | EXPORT_SYMBOL(__udelay); | |
53 | ||
54 | void __ndelay(unsigned long nsecs) | |
55 | { | |
56 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ | |
57 | } | |
58 | EXPORT_SYMBOL(__ndelay); |