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#ifndef _PPC64_DELAY_H

#define _PPC64_DELAY_H

/*

 * Copyright 1996, Paul Mackerras.

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 *

 * PPC64 Support added by Dave Engebretsen, Todd Inglett, Mike Corrigan,

 * Anton Blanchard.

 */

#ifndef __ASSEMBLY__

extern unsigned long tb_ticks_per_usec;

/* define these here to prevent circular dependencies */

#define __HMT_low()     asm volatile("or 1,1,1")

#define __HMT_medium()  asm volatile("or 2,2,2")

#define __barrier()     asm volatile("":::"memory")

static inline unsigned long __get_tb(void)

{

        unsigned long rval;

        asm volatile("mftb %0" : "=r" (rval));

        return rval;

}

static inline void __delay(unsigned long loops)

{

        unsigned long start = __get_tb();

        while((__get_tb()-start) < loops)

                __HMT_low();

        __HMT_medium();

        __barrier();

}

static inline void udelay(unsigned long usecs)

{

        unsigned long loops = tb_ticks_per_usec * usecs;

        __delay(loops);

}

static inline void ndelay(unsigned long nsecs)

{

        unsigned long loops = (tb_ticks_per_usec * nsecs) / 1000;

        __delay(loops);

}

#endif /* !__ASSEMBLY__ */

#endif /* _PPC64_DELAY_H */