46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_GENERIC_DELAY_H
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#define __ASM_GENERIC_DELAY_H
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/* Undefined functions to get compile-time errors */
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extern void __bad_udelay(void);
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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);
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extern void __const_udelay(unsigned long xloops);
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extern void __delay(unsigned long loops);
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/*
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* The weird n/20000 thing suppresses a "comparison is always false due to
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* limited range of data type" warning with non-const 8-bit arguments.
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*/
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/* 0x10c7 is 2**32 / 1000000 (rounded up) */
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#define udelay(n) \
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({ \
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if (__builtin_constant_p(n)) { \
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if ((n) / 20000 >= 1) \
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__bad_udelay(); \
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else \
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__const_udelay((n) * 0x10c7ul); \
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} else { \
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__udelay(n); \
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} \
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})
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/* 0x5 is 2**32 / 1000000000 (rounded up) */
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#define ndelay(n) \
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({ \
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if (__builtin_constant_p(n)) { \
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if ((n) / 20000 >= 1) \
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__bad_ndelay(); \
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else \
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__const_udelay((n) * 5ul); \
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} else { \
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__ndelay(n); \
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} \
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})
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#endif /* __ASM_GENERIC_DELAY_H */
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