LXR linux/arch/h8300/lib/delay.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * delay loops
   4 *
   5 * Copyright (C) 2015 Yoshinori Sato
   6 */
   7
   8#include <linux/module.h>
   9#include <linux/delay.h>
  10#include <asm/param.h>
  11#include <asm/processor.h>
  12#include <asm/timex.h>
  13
  14void __delay(unsigned long cycles)
  15{
  16        __asm__ volatile ("1: dec.l #1,%0\n\t"
  17                          "bne 1b":"=r"(cycles):"0"(cycles));
  18}
  19EXPORT_SYMBOL(__delay);
  20
  21void __const_udelay(unsigned long xloops)
  22{
  23        u64 loops;
  24
  25        loops = (u64)xloops * loops_per_jiffy * HZ;
  26
  27        __delay(loops >> 32);
  28}
  29EXPORT_SYMBOL(__const_udelay);
  30
  31void __udelay(unsigned long usecs)
  32{
  33        __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
  34}
  35EXPORT_SYMBOL(__udelay);
  36
  37void __ndelay(unsigned long nsecs)
  38{
  39        __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
  40}
  41EXPORT_SYMBOL(__ndelay);
  42