1#ifndef __ASM_GENERIC_DELAY_H
 2#define __ASM_GENERIC_DELAY_H
 3
 4/* Undefined functions to get compile-time errors */
 5extern void __bad_udelay(void);
 6extern void __bad_ndelay(void);
 7
 8extern void __udelay(unsigned long usecs);
 9extern void __ndelay(unsigned long nsecs);
10extern void __const_udelay(unsigned long xloops);
11extern 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 */

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_GENERIC_DELAY_H
 3#define __ASM_GENERIC_DELAY_H
 4
 5/* Undefined functions to get compile-time errors */
 6extern void __bad_udelay(void);
 7extern void __bad_ndelay(void);
 8
 9extern void __udelay(unsigned long usecs);
10extern void __ndelay(unsigned long nsecs);
11extern void __const_udelay(unsigned long xloops);
12extern void __delay(unsigned long loops);
13
14/*
15 * The weird n/20000 thing suppresses a "comparison is always false due to
16 * limited range of data type" warning with non-const 8-bit arguments.
17 */
18
19/* 0x10c7 is 2**32 / 1000000 (rounded up) */
20#define udelay(n)							\
21	({								\
22		if (__builtin_constant_p(n)) {				\
23			if ((n) / 20000 >= 1)				\
24				 __bad_udelay();			\
25			else						\
26				__const_udelay((n) * 0x10c7ul);		\
27		} else {						\
28			__udelay(n);					\
29		}							\
30	})
31
32/* 0x5 is 2**32 / 1000000000 (rounded up) */
33#define ndelay(n)							\
34	({								\
35		if (__builtin_constant_p(n)) {				\
36			if ((n) / 20000 >= 1)				\
37				__bad_ndelay();				\
38			else						\
39				__const_udelay((n) * 5ul);		\
40		} else {						\
41			__ndelay(n);					\
42		}							\
43	})
44
45#endif /* __ASM_GENERIC_DELAY_H */