root/include/asm-generic/delay.h

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INCLUDED FROM

#ifndef __ASM_GENERIC_DELAY_H
#define __ASM_GENERIC_DELAY_H

/* Undefined functions to get compile-time errors */
extern void __bad_udelay(void);
extern void __bad_ndelay(void);

extern void __udelay(unsigned long usecs);
extern void __ndelay(unsigned long nsecs);
extern void __const_udelay(unsigned long xloops);
extern void __delay(unsigned long loops);

/*
 * The weird n/20000 thing suppresses a "comparison is always false due to
 * limited range of data type" warning with non-const 8-bit arguments.
 */

/* 0x10c7 is 2**32 / 1000000 (rounded up) */
#define udelay(n)                                                       \
        ({                                                              \
                if (__builtin_constant_p(n)) {                          \
                        if ((n) / 20000 >= 1)                           \
                                 __bad_udelay();                        \
                        else                                            \
                                __const_udelay((n) * 0x10c7ul);         \
                } else {                                                \
                        __udelay(n);                                    \
                }                                                       \
        })

/* 0x5 is 2**32 / 1000000000 (rounded up) */
#define ndelay(n)                                                       \
        ({                                                              \
                if (__builtin_constant_p(n)) {                          \
                        if ((n) / 20000 >= 1)                           \
                                __bad_ndelay();                         \
                        else                                            \
                                __const_udelay((n) * 5ul);              \
                } else {                                                \
                        __ndelay(n);                                    \
                }                                                       \
        })

#endif /* __ASM_GENERIC_DELAY_H */
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