arch/metag/include/asm/delay.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _METAG_DELAY_H
   3 #define _METAG_DELAY_H
   4
   5 /*
   6  * Copyright (C) 1993 Linus Torvalds
   7  *
   8  * Delay routines calling functions in arch/metag/lib/delay.c
   9  */
  10
  11 /* Undefined functions to get compile-time errors */
  12 extern void __bad_udelay(void);
  13 extern void __bad_ndelay(void);
  14
  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);
  19
  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)) : \
  23         __udelay(n))
  24
  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)) : \
  28         __ndelay(n))
  29
  30 #endif /* _METAG_DELAY_H */