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 __delay(unsigned long cycles)14void __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 __const_udelay(unsigned long xloops)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 } 29 EXPORT_SYMBOL(__const_udelay); 30 __udelay(unsigned long usecs)31void __udelay(unsigned long usecs) 32 { 33 __const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */ 34 } 35 EXPORT_SYMBOL(__udelay); 36 __ndelay(unsigned long nsecs)37void __ndelay(unsigned long nsecs) 38 { 39 __const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */ 40 } 41 EXPORT_SYMBOL(__ndelay); 42