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224cd129 JB |
1 | /* |
2 | * OpenRISC Linux | |
3 | * | |
4 | * Linux architectural port borrowing liberally from similar works of | |
5 | * others. All original copyrights apply as per the original source | |
6 | * declaration. | |
7 | * | |
8 | * Modifications for the OpenRISC architecture: | |
9 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * version 2 as published by the Free Software Foundation | |
14 | * | |
15 | * Precise Delay Loops | |
16 | */ | |
17 | ||
18 | #include <linux/kernel.h> | |
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <asm/delay.h> | |
22 | #include <asm/timex.h> | |
23 | #include <asm/processor.h> | |
24 | ||
b881bc46 | 25 | int read_current_timer(unsigned long *timer_value) |
224cd129 JB |
26 | { |
27 | *timer_value = mfspr(SPR_TTCR); | |
28 | return 0; | |
29 | } | |
30 | ||
31 | void __delay(unsigned long cycles) | |
32 | { | |
807607f7 | 33 | cycles_t start = get_cycles(); |
224cd129 | 34 | |
807607f7 | 35 | while ((get_cycles() - start) < cycles) |
224cd129 JB |
36 | cpu_relax(); |
37 | } | |
38 | EXPORT_SYMBOL(__delay); | |
39 | ||
40 | inline void __const_udelay(unsigned long xloops) | |
41 | { | |
42 | unsigned long long loops; | |
43 | ||
43916466 | 44 | loops = (unsigned long long)xloops * loops_per_jiffy * HZ; |
224cd129 JB |
45 | |
46 | __delay(loops >> 32); | |
47 | } | |
48 | EXPORT_SYMBOL(__const_udelay); | |
49 | ||
50 | void __udelay(unsigned long usecs) | |
51 | { | |
52 | __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ | |
53 | } | |
54 | EXPORT_SYMBOL(__udelay); | |
55 | ||
56 | void __ndelay(unsigned long nsecs) | |
57 | { | |
58 | __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ | |
59 | } | |
60 | EXPORT_SYMBOL(__ndelay); |