1 #ifndef __ASM_GENERIC_DELAY_H 2 #define __ASM_GENERIC_DELAY_H 3 4 /* Undefined functions to get compile-time errors */ 5 extern void __bad_udelay(void); 6 extern void __bad_ndelay(void); 7 8 extern void __udelay(unsigned long usecs); 9 extern void __ndelay(unsigned long nsecs); 10 extern void __const_udelay(unsigned long xloops); 11 extern void __delay(unsigned long loops); 12 13 /* 14 * The weird n/20000 thing suppresses a "comparison is always false due to 15 * limited range of data type" warning with non-const 8-bit arguments. 16 */ 17 18 /* 0x10c7 is 2**32 / 1000000 (rounded up) */ 19 #define udelay(n) \ 20 ({ \ 21 if (__builtin_constant_p(n)) { \ 22 if ((n) / 20000 >= 1) \ 23 __bad_udelay(); \ 24 else \ 25 __const_udelay((n) * 0x10c7ul); \ 26 } else { \ 27 __udelay(n); \ 28 } \ 29 }) 30 31 /* 0x5 is 2**32 / 1000000000 (rounded up) */ 32 #define ndelay(n) \ 33 ({ \ 34 if (__builtin_constant_p(n)) { \ 35 if ((n) / 20000 >= 1) \ 36 __bad_ndelay(); \ 37 else \ 38 __const_udelay((n) * 5ul); \ 39 } else { \ 40 __ndelay(n); \ 41 } \ 42 }) 43 44 #endif /* __ASM_GENERIC_DELAY_H */ 45