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include/asm-generic/delay.h
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#ifndef __ASM_GENERIC_DELAY_H #define __ASM_GENERIC_DELAY_H |
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/* Undefined functions to get compile-time errors */ extern void __bad_udelay(void); extern void __bad_ndelay(void); |
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extern void __udelay(unsigned long usecs); |
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extern void __ndelay(unsigned long nsecs); extern void __const_udelay(unsigned long xloops); |
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extern void __delay(unsigned long loops); |
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/* * 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. */ |
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/* 0x10c7 is 2**32 / 1000000 (rounded up) */ |
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#define udelay(n) \ ({ \ if (__builtin_constant_p(n)) { \ if ((n) / 20000 >= 1) \ __bad_udelay(); \ else \ __const_udelay((n) * 0x10c7ul); \ } else { \ __udelay(n); \ } \ }) |
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/* 0x5 is 2**32 / 1000000000 (rounded up) */ |
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#define ndelay(n) \ ({ \ if (__builtin_constant_p(n)) { \ if ((n) / 20000 >= 1) \ __bad_ndelay(); \ else \ __const_udelay((n) * 5ul); \ } else { \ __ndelay(n); \ } \ }) |
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#endif /* __ASM_GENERIC_DELAY_H */ |