Line data Source code
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 :
12 : extern 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
37 : static inline void ndelay(unsigned long x)
38 : {
39 : udelay(DIV_ROUND_UP(x, 1000));
40 : }
41 : #define ndelay(x) ndelay(x)
42 : #endif
43 :
44 : extern unsigned long lpj_fine;
45 : void calibrate_delay(void);
46 : void msleep(unsigned int msecs);
47 : unsigned long msleep_interruptible(unsigned int msecs);
48 :
49 : static inline void ssleep(unsigned int seconds)
50 : {
51 : msleep(seconds * 1000);
52 : }
53 :
54 1 : #endif /* defined(_LINUX_DELAY_H) */
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