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