// SPDX-License-Identifier: GPL-2.0 /* * delay loops * * Copyright (C) 2015 Yoshinori Sato */ #include <linux/module.h> #include <linux/delay.h> #include <asm/param.h> #include <asm/processor.h> #include <asm/timex.h> void __delay(unsigned long cycles) { __asm__ volatile ("1: dec.l #1,%0\n\t" "bne 1b":"=r"(cycles):"0"(cycles)); } EXPORT_SYMBOL(__delay); void __const_udelay(unsigned long xloops) { u64 loops; loops = (u64)xloops * loops_per_jiffy * HZ; __delay(loops >> 32); } EXPORT_SYMBOL(__const_udelay); void __udelay(unsigned long usecs) { __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ } EXPORT_SYMBOL(__udelay); void __ndelay(unsigned long nsecs) { __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ } EXPORT_SYMBOL(__ndelay);