1#ifndef _LINUX_DELAY_H
2#define _LINUX_DELAY_H
3
4/*
5 * Copyright (C) 1993 Linus Torvalds
6 *
7 * Delay routines, using a pre-computed "loops_per_jiffy" value.
8 */
9
10#include <linux/kernel.h>
11
12extern unsigned long loops_per_jiffy;
13
14#include <asm/delay.h>
15
16/*
17 * Using udelay() for intervals greater than a few milliseconds can
18 * risk overflow for high loops_per_jiffy (high bogomips) machines. The
19 * mdelay() provides a wrapper to prevent this.  For delays greater
20 * than MAX_UDELAY_MS milliseconds, the wrapper is used.  Architecture
21 * specific values can be defined in asm-???/delay.h as an override.
22 * The 2nd mdelay() definition ensures GCC will optimize away the
23 * while loop for the common cases where n <= MAX_UDELAY_MS  --  Paul G.
24 */
25
26#ifndef MAX_UDELAY_MS
27#define MAX_UDELAY_MS	5
28#endif
29
30#ifndef mdelay
31#define mdelay(n) (\
32	(__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
33	({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
34#endif
35
36#ifndef ndelay
37static inline void ndelay(unsigned long x)
38{
39	udelay(DIV_ROUND_UP(x, 1000));
40}
41#define ndelay(x) ndelay(x)
42#endif
43
44extern unsigned long lpj_fine;
45void calibrate_delay(void);
46void msleep(unsigned int msecs);
47unsigned long msleep_interruptible(unsigned int msecs);
48void usleep_range(unsigned long min, unsigned long max);
49
50static inline void ssleep(unsigned int seconds)
51{
52	msleep(seconds * 1000);
53}
54
55#endif /* defined(_LINUX_DELAY_H) */
56