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delay.h

#ifndef _PARISC_DELAY_H
#define _PARISC_DELAY_H

#include <asm/system.h>    /* for mfctl() */
#include <asm/processor.h> /* for boot_cpu_data */


/*
 * Copyright (C) 1993 Linus Torvalds
 *
 * Delay routines
 */

static __inline__ void __delay(unsigned long loops) {
      asm volatile(
      "     .balignl    64,0x34000034\n"
      "     addib,UV -1,%0,.\n"
      "     nop\n"
            : "=r" (loops) : "0" (loops));
}

static __inline__ void __cr16_delay(unsigned long clocks) {
      unsigned long start;

      /*
       * Note: Due to unsigned math, cr16 rollovers shouldn't be
       * a problem here. However, on 32 bit, we need to make sure
       * we don't pass in too big a value. The current default
       * value of MAX_UDELAY_MS should help prevent this.
       */

      start = mfctl(16);
      while ((mfctl(16) - start) < clocks)
          ;
}

static __inline__ void __udelay(unsigned long usecs) {
      __cr16_delay(usecs * ((unsigned long)boot_cpu_data.cpu_hz / 1000000UL));
}

#define udelay(n) __udelay(n)

#endif /* defined(_PARISC_DELAY_H) */

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