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1da177e4 LT |
1 | #ifndef __ASM_ARM_DELAY_H |
2 | #define __ASM_ARM_DELAY_H | |
3 | ||
4 | /* | |
5 | * Copyright (C) 1995 Russell King | |
6 | * | |
7 | * Delay routines, using a pre-computed "loops_per_second" value. | |
8 | */ | |
9 | ||
10 | extern void __delay(int loops); | |
11 | ||
12 | /* | |
13 | * division by multiplication: you don't have to worry about | |
14 | * loss of precision. | |
15 | * | |
16 | * Use only for very small delays ( < 1 msec). Should probably use a | |
17 | * lookup table, really, as the multiplications take much too long with | |
18 | * short delays. This is a "reasonable" implementation, though (and the | |
19 | * first constant multiplications gets optimized away if the delay is | |
20 | * a constant) | |
21 | * | |
22 | * FIXME - lets improve it then... | |
23 | */ | |
24 | extern void udelay(unsigned long usecs); | |
25 | ||
26 | static inline unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c) | |
27 | { | |
28 | return a * b / c; | |
29 | } | |
30 | ||
31 | ||
32 | ||
33 | #endif /* defined(_ARM_DELAY_H) */ | |
34 |