diff options
Diffstat (limited to 'include/asm-m68k/delay.h')
| -rw-r--r-- | include/asm-m68k/delay.h | 34 |
1 files changed, 19 insertions, 15 deletions
diff --git a/include/asm-m68k/delay.h b/include/asm-m68k/delay.h index 804a654b7..731dd0b1a 100644 --- a/include/asm-m68k/delay.h +++ b/include/asm-m68k/delay.h @@ -7,18 +7,13 @@ * Delay routines, using a pre-computed "loops_per_second" value. */ -extern __inline__ void __delay(int loops) +extern __inline__ void __delay(unsigned long loops) { - __asm__("\n\tmovel %0,d0\n1:\tsubql #1,d0\n\tbpls 1b\n" - : /* no outputs */ - : "g" (loops) - : "d0"); + __asm__ __volatile__ ("1: subql #1,%0; jcc 1b" + : "=d" (loops) : "0" (loops)); } /* - * division by multiplication: you don't have to worry about - * loss of precision. - * * 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 @@ -27,14 +22,23 @@ extern __inline__ void __delay(int loops) */ extern __inline__ void udelay(unsigned long usecs) { - asm ("mulul %1,d0,%0\n\t" - "divul %2,d0,%0" - : "=d" (usecs) - : "d" (usecs), - "i" (1000000), - "0" (loops_per_sec) - : "d0"); + unsigned long tmp; + + usecs *= 4295; /* 2**32 / 1000000 */ + __asm__ ("mulul %2,%0:%1" + : "=d" (usecs), "=d" (tmp) + : "d" (usecs), "1" (loops_per_sec)); __delay(usecs); } +extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c) +{ + unsigned long tmp; + + __asm__ ("mulul %2,%0:%1; divul %3,%0:%1" + : "=d" (tmp), "=d" (a) + : "d" (b), "d" (c), "1" (a)); + return a; +} + #endif /* defined(_M68K_DELAY_H) */ |