162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */
262306a36Sopenharmony_ci#ifndef __ASM_GENERIC_DELAY_H
362306a36Sopenharmony_ci#define __ASM_GENERIC_DELAY_H
462306a36Sopenharmony_ci
562306a36Sopenharmony_ci/* Undefined functions to get compile-time errors */
662306a36Sopenharmony_ciextern void __bad_udelay(void);
762306a36Sopenharmony_ciextern void __bad_ndelay(void);
862306a36Sopenharmony_ci
962306a36Sopenharmony_ciextern void __udelay(unsigned long usecs);
1062306a36Sopenharmony_ciextern void __ndelay(unsigned long nsecs);
1162306a36Sopenharmony_ciextern void __const_udelay(unsigned long xloops);
1262306a36Sopenharmony_ciextern void __delay(unsigned long loops);
1362306a36Sopenharmony_ci
1462306a36Sopenharmony_ci/*
1562306a36Sopenharmony_ci * The weird n/20000 thing suppresses a "comparison is always false due to
1662306a36Sopenharmony_ci * limited range of data type" warning with non-const 8-bit arguments.
1762306a36Sopenharmony_ci */
1862306a36Sopenharmony_ci
1962306a36Sopenharmony_ci/* 0x10c7 is 2**32 / 1000000 (rounded up) */
2062306a36Sopenharmony_ci#define udelay(n)							\
2162306a36Sopenharmony_ci	({								\
2262306a36Sopenharmony_ci		if (__builtin_constant_p(n)) {				\
2362306a36Sopenharmony_ci			if ((n) / 20000 >= 1)				\
2462306a36Sopenharmony_ci				 __bad_udelay();			\
2562306a36Sopenharmony_ci			else						\
2662306a36Sopenharmony_ci				__const_udelay((n) * 0x10c7ul);		\
2762306a36Sopenharmony_ci		} else {						\
2862306a36Sopenharmony_ci			__udelay(n);					\
2962306a36Sopenharmony_ci		}							\
3062306a36Sopenharmony_ci	})
3162306a36Sopenharmony_ci
3262306a36Sopenharmony_ci/* 0x5 is 2**32 / 1000000000 (rounded up) */
3362306a36Sopenharmony_ci#define ndelay(n)							\
3462306a36Sopenharmony_ci	({								\
3562306a36Sopenharmony_ci		if (__builtin_constant_p(n)) {				\
3662306a36Sopenharmony_ci			if ((n) / 20000 >= 1)				\
3762306a36Sopenharmony_ci				__bad_ndelay();				\
3862306a36Sopenharmony_ci			else						\
3962306a36Sopenharmony_ci				__const_udelay((n) * 5ul);		\
4062306a36Sopenharmony_ci		} else {						\
4162306a36Sopenharmony_ci			__ndelay(n);					\
4262306a36Sopenharmony_ci		}							\
4362306a36Sopenharmony_ci	})
4462306a36Sopenharmony_ci
4562306a36Sopenharmony_ci#endif /* __ASM_GENERIC_DELAY_H */
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