1 /* SPDX-License-Identifier: GPL-2.0 */
6 * Copyright (C) 1993 Linus Torvalds
8 * Delay routines calling functions in arch/metag/lib/delay.c
11 /* Undefined functions to get compile-time errors */
12 extern void __bad_udelay(void);
13 extern void __bad_ndelay(void);
15 extern void __udelay(unsigned long usecs);
16 extern void __ndelay(unsigned long nsecs);
17 extern void __const_udelay(unsigned long xloops);
18 extern void __delay(unsigned long loops);
20 /* 0x10c7 is 2**32 / 1000000 (rounded up) */
21 #define udelay(n) (__builtin_constant_p(n) ? \
22 ((n) > 20000 ? __bad_udelay() : __const_udelay((n) * 0x10c7ul)) : \
25 /* 0x5 is 2**32 / 1000000000 (rounded up) */
26 #define ndelay(n) (__builtin_constant_p(n) ? \
27 ((n) > 20000 ? __bad_ndelay() : __const_udelay((n) * 5ul)) : \
30 #endif /* _METAG_DELAY_H */