| #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 */ |
