1/* 2 * delay loops 3 * 4 * Copyright (C) 2015 Yoshinori Sato 5 */ 6 7#include <linux/module.h> 8#include <linux/delay.h> 9#include <asm/param.h> 10#include <asm/processor.h> 11#include <asm/timex.h> 12 13void __delay(unsigned long cycles) 14{ 15 __asm__ volatile ("1: dec.l #1,%0\n\t" 16 "bne 1b":"=r"(cycles):"0"(cycles)); 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