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
  14 void __delay(unsigned long cycles)
  15 {
  16         __asm__ volatile ("1: dec.l #1,%0\n\t"
  17                           "bne 1b":"=r"(cycles):"0"(cycles));
  18 }
  19 EXPORT_SYMBOL(__delay);
  20
  21 void __const_udelay(unsigned long xloops)
  22 {
  23         u64 loops;
  24
  25         loops = (u64)xloops * loops_per_jiffy * HZ;
  26
  27         __delay(loops >> 32);
  28 }
  29 EXPORT_SYMBOL(__const_udelay);
  30
  31 void __udelay(unsigned long usecs)
  32 {
  33         __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
  34 }
  35 EXPORT_SYMBOL(__udelay);
  36
  37 void __ndelay(unsigned long nsecs)
  38 {
  39         __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
  40 }
  41 EXPORT_SYMBOL(__ndelay);