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/*

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 *

 * Copyright (C) 1994 by Waldorf Electronics

 * Copyright (C) 1995 - 1998, 2001 by Ralf Baechle

 */

#ifndef _ASM_DELAY_H

#define _ASM_DELAY_H

#include <linux/config.h>

#include <linux/param.h>

extern unsigned long loops_per_jiffy;

static __inline__ void __delay(unsigned long loops)

{

        __asm__ __volatile__ (

                ".set\tnoreorder\n"

                "1:\tbnez\t%0,1b\n\t"

                "subu\t%0,1\n\t"

                ".set\treorder"

                :"=r" (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

 * first constant multiplications gets optimized away if the delay is

 * a constant)

 */

static __inline__ void __udelay(unsigned long usecs, unsigned long lpj)

{

        unsigned long lo;

        /*

         * Excessive precission?  Probably ...

         */

        usecs *= (unsigned long) (((0x8000000000000000ULL / (500000 / HZ)) +

                                   0x80000000ULL) >> 32);

        __asm__("multu\t%2,%3"

                :"=h" (usecs), "=l" (lo)

                :"r" (usecs),"r" (lpj));

        __delay(usecs);

}

static __inline__ void __ndelay(unsigned long nsecs, unsigned long lpj)

{

        unsigned long lo;

        /*

         * Excessive precission?  Probably ...

         */

        nsecs *= (unsigned long) (((0x8000000000000000ULL / (500000000 / HZ)) +

                                   0x80000000ULL) >> 32);

        __asm__("multu\t%2,%3"

                :"=h" (nsecs), "=l" (lo)

                :"r" (nsecs),"r" (lpj));

        __delay(nsecs);

}

#ifdef CONFIG_SMP

#define __udelay_val cpu_data[smp_processor_id()].udelay_val

#else

#define __udelay_val loops_per_jiffy

#endif

#define udelay(usecs) __udelay((usecs),__udelay_val)

#define ndelay(nsecs) __ndelay((nsecs),__udelay_val)

#endif /* _ASM_DELAY_H */