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- #ifndef _PPC_DELAY_H
- #define _PPC_DELAY_H
-
- /*
- * Copyright 1996, Paul Mackerras.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
- extern unsigned long loops_per_sec;
-
- extern __inline__ void __delay(unsigned int loops)
- {
- if (loops != 0)
- __asm__ __volatile__("mtctr %0; 1: bdnz 1b" : :
- "r" (loops) : "ctr");
- }
-
- extern __inline__ void udelay(unsigned long usecs)
- {
- unsigned long loops;
-
- /* compute (usecs * 2^32 / 10^6) * loops_per_sec / 2^32 */
- usecs *= 0x10c6; /* 2^32 / 10^6 */
- __asm__("mulhwu %0,%1,%2" : "=r" (loops) :
- "r" (usecs), "r" (loops_per_sec));
- __delay(loops);
- }
-
- #endif /* defined(_PPC_DELAY_H) */
-