| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |