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Diffstat (limited to 'include/asm-arm26/delay.h')
| -rw-r--r-- | include/asm-arm26/delay.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/asm-arm26/delay.h b/include/asm-arm26/delay.h new file mode 100644 index 00000000000..40fbf7bbe6c --- /dev/null +++ b/include/asm-arm26/delay.h @@ -0,0 +1,34 @@ +#ifndef __ASM_ARM_DELAY_H +#define __ASM_ARM_DELAY_H + +/* + * Copyright (C) 1995 Russell King + * + * Delay routines, using a pre-computed "loops_per_second" value. + */ + +extern void __delay(int loops); + +/* + * division by multiplication: you don't have to worry about + * loss of precision. + * + * Use only for very small delays ( < 1 msec). Should probably use a + * lookup table, really, as the multiplications take much too long with + * short delays. This is a "reasonable" implementation, though (and the + * first constant multiplications gets optimized away if the delay is + * a constant) + * + * FIXME - lets improve it then... + */ +extern void udelay(unsigned long usecs); + +static inline unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c) +{ + return a * b / c; +} + + + +#endif /* defined(_ARM_DELAY_H) */ + |