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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _H8300_DELAY_H
2#define _H8300_DELAY_H
3
4#include <asm/param.h>
5
6/*
7 * Copyright (C) 2002 Yoshinori Sato <ysato@sourceforge.jp>
8 *
9 * Delay routines, using a pre-computed "loops_per_second" value.
10 */
11
Adrian Bunk219576e2006-12-06 20:40:22 -080012static inline void __delay(unsigned long loops)
Linus Torvalds1da177e2005-04-16 15:20:36 -070013{
14 __asm__ __volatile__ ("1:\n\t"
15 "dec.l #1,%0\n\t"
16 "bne 1b"
17 :"=r" (loops):"0"(loops));
18}
19
20/*
21 * Use only for very small delays ( < 1 msec). Should probably use a
22 * lookup table, really, as the multiplications take much too long with
23 * short delays. This is a "reasonable" implementation, though (and the
24 * first constant multiplications gets optimized away if the delay is
25 * a constant)
26 */
27
28extern unsigned long loops_per_jiffy;
29
Adrian Bunk219576e2006-12-06 20:40:22 -080030static inline void udelay(unsigned long usecs)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
32 usecs *= 4295; /* 2**32 / 1000000 */
33 usecs /= (loops_per_jiffy*HZ);
34 if (usecs)
35 __delay(usecs);
36}
37
38#endif /* _H8300_DELAY_H */