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
  11 void __delay(unsigned long cycles)
  12 {
  13         cycles_t start = get_cycles();
  14
  15         while ((get_cycles() - start) < cycles)
  16                 cpu_relax();
  17 }
  18 EXPORT_SYMBOL(__delay);
  19
  20 void __const_udelay(unsigned long xloops)
  21 {
  22         u64 loops;
  23
  24         loops = (u64)xloops * loops_per_jiffy * HZ;
  25
  26         __delay(loops >> 32);
  27 }
  28 EXPORT_SYMBOL(__const_udelay);
  29
  30 void __udelay(unsigned long usecs)
  31 {
  32         __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
  33 }
  34 EXPORT_SYMBOL(__udelay);
  35
  36 void __ndelay(unsigned long nsecs)
  37 {
  38         __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
  39 }
  40 EXPORT_SYMBOL(__ndelay);