diff options
Diffstat (limited to 'include/asm-ppc/delay.h')
| -rw-r--r-- | include/asm-ppc/delay.h | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/include/asm-ppc/delay.h b/include/asm-ppc/delay.h index 68f1a4da7..9da227167 100644 --- a/include/asm-ppc/delay.h +++ b/include/asm-ppc/delay.h @@ -1,14 +1,31 @@ #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 __inline__ void __delay(unsigned long ); -extern __inline__ void __udelay(unsigned long ); - +extern __inline__ void __delay(unsigned int loops) +{ + if (loops != 0) + __asm__ __volatile__("mtctr %0; 1: bdnz 1b" : : + "r" (loops) : "ctr"); +} -extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c) +extern __inline__ void udelay(unsigned long usecs) { - return (a*b)/c; + 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) */ |