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5636919b RB |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (C) 1994 by Waldorf Electronics | |
7 | * Copyright (C) 1995 - 2000, 01, 03 by Ralf Baechle | |
8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. | |
9 | * Copyright (C) 2007 Maciej W. Rozycki | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/param.h> | |
13 | #include <linux/smp.h> | |
14 | ||
15 | #include <asm/compiler.h> | |
16 | #include <asm/war.h> | |
17 | ||
5210edcd | 18 | void __delay(unsigned long loops) |
5636919b RB |
19 | { |
20 | __asm__ __volatile__ ( | |
21 | " .set noreorder \n" | |
22 | " .align 3 \n" | |
23 | "1: bnez %0, 1b \n" | |
4ea494b5 | 24 | #if BITS_PER_LONG == 32 |
5636919b | 25 | " subu %0, 1 \n" |
5210edcd DD |
26 | #else |
27 | " dsubu %0, 1 \n" | |
28 | #endif | |
5636919b RB |
29 | " .set reorder \n" |
30 | : "=r" (loops) | |
31 | : "0" (loops)); | |
32 | } | |
33 | EXPORT_SYMBOL(__delay); | |
34 | ||
35 | /* | |
36 | * Division by multiplication: you don't have to worry about | |
37 | * loss of precision. | |
38 | * | |
39 | * Use only for very small delays ( < 1 msec). Should probably use a | |
40 | * lookup table, really, as the multiplications take much too long with | |
41 | * short delays. This is a "reasonable" implementation, though (and the | |
42 | * first constant multiplications gets optimized away if the delay is | |
43 | * a constant) | |
44 | */ | |
45 | ||
46 | void __udelay(unsigned long us) | |
47 | { | |
abe5b417 | 48 | unsigned int lpj = raw_current_cpu_data.udelay_val; |
5636919b | 49 | |
3cb3a66c | 50 | __delay((us * 0x000010c7ull * HZ * lpj) >> 32); |
5636919b RB |
51 | } |
52 | EXPORT_SYMBOL(__udelay); | |
53 | ||
54 | void __ndelay(unsigned long ns) | |
55 | { | |
abe5b417 | 56 | unsigned int lpj = raw_current_cpu_data.udelay_val; |
5636919b | 57 | |
3cb3a66c | 58 | __delay((ns * 0x00000005ull * HZ * lpj) >> 32); |
5636919b RB |
59 | } |
60 | EXPORT_SYMBOL(__ndelay); |