1/*
2 * include/asm-v850/delay.h -- Delay routines, using a pre-computed
3 * 	"loops_per_second" value
4 *
5 *  Copyright (C) 2001,03  NEC Corporation
6 *  Copyright (C) 2001,03  Miles Bader <miles@gnu.org>
7 *  Copyright (C) 1994 Hamish Macdonald
8 *
9 * This file is subject to the terms and conditions of the GNU General
10 * Public License.  See the file COPYING in the main directory of this
11 * archive for more details.
12 */
13
14#ifndef __V850_DELAY_H__
15#define __V850_DELAY_H__
16
17#include <asm/param.h>
18
19static inline void __delay(unsigned long loops)
20{
21	if (loops)
22		__asm__ __volatile__ ("1: add -1, %0; bnz 1b"
23				      : "=r" (loops) : "0" (loops));
24}
25
26/*
27 * Use only for very small delays ( < 1 msec).  Should probably use a
28 * lookup table, really, as the multiplications take much too long with
29 * short delays.  This is a "reasonable" implementation, though (and the
30 * first constant multiplications gets optimized away if the delay is
31 * a constant)
32 */
33
34extern unsigned long loops_per_jiffy;
35
36static inline void udelay(unsigned long usecs)
37{
38	register unsigned long full_loops, part_loops;
39
40	full_loops = ((usecs * HZ) / 1000000) * loops_per_jiffy;
41	usecs %= (1000000 / HZ);
42	part_loops = (usecs * HZ * loops_per_jiffy) / 1000000;
43
44	__delay(full_loops + part_loops);
45}
46
47#endif /* __V850_DELAY_H__ */
48