LXR linux/arch/nios2/lib/delay.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/* Copyright Altera Corporation (C) 2014. All rights reserved.
   3 */
   4
   5#include <linux/module.h>
   6#include <asm/delay.h>
   7#include <asm/param.h>
   8#include <asm/processor.h>
   9#include <asm/timex.h>
  10
  11void __delay(unsigned long cycles)
  12{
  13        cycles_t start = get_cycles();
  14
  15        while ((get_cycles() - start) < cycles)
  16                cpu_relax();
  17}
  18EXPORT_SYMBOL(__delay);
  19
  20void __const_udelay(unsigned long xloops)
  21{
  22        u64 loops;
  23
  24        loops = (u64)xloops * loops_per_jiffy * HZ;
  25
  26        __delay(loops >> 32);
  27}
  28EXPORT_SYMBOL(__const_udelay);
  29
  30void __udelay(unsigned long usecs)
  31{
  32        __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
  33}
  34EXPORT_SYMBOL(__udelay);
  35
  36void __ndelay(unsigned long nsecs)
  37{
  38        __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
  39}
  40EXPORT_SYMBOL(__ndelay);
  41