delay.h revision 1.8 
1/*	$NetBSD: delay.h,v 1.8 2021/12/19 09:43:49 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _LINUX_DELAY_H_
33#define _LINUX_DELAY_H_
34
35#include <sys/param.h>
36#include <sys/kernel.h>
37#include <sys/proc.h>
38
39#include <linux/kernel.h>
40
41#define	MAX_UDELAY_MS	5
42
43static inline void
44udelay(unsigned int usec)
45{
46	DELAY(usec);
47}
48
49static inline void
50usleep_range(unsigned long minimum, unsigned long maximum __unused)
51{
52	DELAY(minimum);
53}
54
55static inline void
56mdelay(unsigned int msec)
57{
58
59	if (msec < MAX_UDELAY_MS)
60		udelay(msec * 1000);
61	else
62		while (msec--)
63			udelay(1000);
64}
65
66static inline void
67msleep(unsigned int msec)
68{
69	if (cold ||
70	    ((hz < 1000) && (msec < (1000/(unsigned)hz))))
71		mdelay(msec);
72	else
73		(void)kpause("lnxmslep", false, mstohz(msec), NULL);
74}
75
76static inline void
77ndelay(unsigned int nsec)
78{
79
80	DELAY((nsec + 999) / 1000);
81}
82
83#endif  /* _LINUX_DELAY_H_ */
84