#ifndef _M68K_DELAY_H
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#ifndef _M68K_DELAY_H
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#define _M68K_DELAY_H
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#define _M68K_DELAY_H
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/*
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/*
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* Copyright (C) 1994 Hamish Macdonald
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* Copyright (C) 1994 Hamish Macdonald
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*
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*
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* Delay routines, using a pre-computed "loops_per_second" value.
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* Delay routines, using a pre-computed "loops_per_second" value.
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*/
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*/
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extern __inline__ void __delay(int loops)
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extern __inline__ void __delay(int loops)
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{
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{
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__asm__ __volatile__ ("\n\tmovel %0,%/d0\n1:\tsubql #1,%/d0\n\t"
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__asm__ __volatile__ ("\n\tmovel %0,%/d0\n1:\tsubql #1,%/d0\n\t"
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"bpls 1b\n"
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"bpls 1b\n"
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: /* no outputs */
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: /* no outputs */
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: "g" (loops)
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: "g" (loops)
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: "d0");
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: "d0");
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}
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}
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/*
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/*
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* Use only for very small delays ( < 1 msec). Should probably use a
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* Use only for very small delays ( < 1 msec). Should probably use a
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* lookup table, really, as the multiplications take much too long with
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* lookup table, really, as the multiplications take much too long with
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* short delays. This is a "reasonable" implementation, though (and the
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* short delays. This is a "reasonable" implementation, though (and the
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* first constant multiplications gets optimized away if the delay is
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* first constant multiplications gets optimized away if the delay is
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* a constant)
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* a constant)
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*/
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*/
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extern __inline__ void udelay(unsigned long usecs)
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extern __inline__ void udelay(unsigned long usecs)
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{
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{
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usecs *= 0x000010c6; /* 2**32 / 1000000 */
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usecs *= 0x000010c6; /* 2**32 / 1000000 */
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__asm__ __volatile__ ("mulul %1,%0:%2"
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__asm__ __volatile__ ("mulul %1,%0:%2"
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: "=d" (usecs)
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: "=d" (usecs)
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: "d" (usecs),
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: "d" (usecs),
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"d" (loops_per_sec));
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"d" (loops_per_sec));
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__delay(usecs);
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__delay(usecs);
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}
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}
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extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
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extern __inline__ unsigned long muldiv(unsigned long a, unsigned long b, unsigned long c)
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{
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{
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__asm__ ("mulul %1,%/d0:%0\n\tdivul %2,%/d0:%0"
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__asm__ ("mulul %1,%/d0:%0\n\tdivul %2,%/d0:%0"
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:"=d" (a)
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:"=d" (a)
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:"d" (b),
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:"d" (b),
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"d" (c),
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"d" (c),
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"0" (a)
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"0" (a)
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:"d0");
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:"d0");
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return a;
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return a;
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}
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}
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#endif /* defined(_M68K_DELAY_H) */
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#endif /* defined(_M68K_DELAY_H) */
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