Merge master.kernel.org:/pub/scm/linux/kernel/git/chrisw/lsm-2.6
[linux-2.6] / include / asm-h8300 / delay.h
1 #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
12 extern __inline__ void __delay(unsigned long loops)
13 {
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
28 extern unsigned long loops_per_jiffy;
29
30 extern __inline__ void udelay(unsigned long usecs)
31 {
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 */