35 строки
820 B
C
35 строки
820 B
C
#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) */
|
|
|