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Linux/include/linux/delay.h

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  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 void usleep_range(unsigned long min, unsigned long max);
 49 
 50 static inline void ssleep(unsigned int seconds)
 51 {
 52         msleep(seconds * 1000);
 53 }
 54 
 55 #endif /* defined(_LINUX_DELAY_H) */
 56 

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