| #ifndef _H8300_DELAY_H | |
| #define _H8300_DELAY_H | |
| #include <asm/param.h> | |
| /* | |
| * Copyright (C) 2002 Yoshinori Sato <ysato@sourceforge.jp> | |
| * | |
| * Delay routines, using a pre-computed "loops_per_second" value. | |
| */ | |
| static inline void __delay(unsigned long loops) | |
| { | |
| __asm__ __volatile__ ("1:\n\t" | |
| "dec.l #1,%0\n\t" | |
| "bne 1b" | |
| :"=r" (loops):"0"(loops)); | |
| } | |
| /* | |
| * Use only for very small delays ( < 1 msec). Should probably use a | |
| * lookup table, really, as the multiplications take much too long with | |
| * short delays. This is a "reasonable" implementation, though (and the | |
| * first constant multiplications gets optimized away if the delay is | |
| * a constant) | |
| */ | |
| extern unsigned long loops_per_jiffy; | |
| static inline void udelay(unsigned long usecs) | |
| { | |
| usecs *= 4295; /* 2**32 / 1000000 */ | |
| usecs /= (loops_per_jiffy*HZ); | |
| if (usecs) | |
| __delay(usecs); | |
| } | |
| #endif /* _H8300_DELAY_H */ |