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
43 static inline void
udelay(unsigned int usec)44 udelay(unsigned int usec)
45 {
46 DELAY(usec);
47 }
48
49 static inline void
usleep_range(unsigned long minimum,unsigned long maximum __unused)50 usleep_range(unsigned long minimum, unsigned long maximum __unused)
51 {
52 DELAY(minimum);
53 }
54
55 static inline void
mdelay(unsigned int msec)56 mdelay(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
66 static inline void
msleep(unsigned int msec)67 msleep(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
76 static inline void
ndelay(unsigned int nsec)77 ndelay(unsigned int nsec)
78 {
79
80 DELAY((nsec + 999) / 1000);
81 }
82
83 #endif /* _LINUX_DELAY_H_ */
84