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