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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
Andrew Morton5cba6d22008-03-04 14:28:45 -080010#include <linux/kernel.h>
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012extern 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
Anton Blanchard1e92a552006-06-15 14:11:22 +100030#ifndef mdelay
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#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
Andrew Morton5cba6d22008-03-04 14:28:45 -080037static inline void ndelay(unsigned long x)
38{
39 udelay(DIV_ROUND_UP(x, 1000));
40}
41#define ndelay(x) ndelay(x)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#endif
43
44void calibrate_delay(void);
45void msleep(unsigned int msecs);
46unsigned long msleep_interruptible(unsigned int msecs);
47
48static inline void ssleep(unsigned int seconds)
49{
50 msleep(seconds * 1000);
51}
52
53#endif /* defined(_LINUX_DELAY_H) */