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