1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3#include <linux/kernel.h>
4#include <linux/module.h>
5#include <linux/init.h>
6#include <linux/delay.h>
7
8void __aligned(8) __delay(unsigned long loops)
9{
10	asm volatile (
11		"mov r0, r0\n"
12		"1:declt %0\n"
13		"bf	1b"
14		: "=r"(loops)
15		: "0"(loops));
16}
17EXPORT_SYMBOL(__delay);
18
19void __const_udelay(unsigned long xloops)
20{
21	unsigned long long loops;
22
23	loops = (unsigned long long)xloops * loops_per_jiffy * HZ;
24
25	__delay(loops >> 32);
26}
27EXPORT_SYMBOL(__const_udelay);
28
29void __udelay(unsigned long usecs)
30{
31	__const_udelay(usecs * 0x10C7UL); /* 2**32 / 1000000 (rounded up) */
32}
33EXPORT_SYMBOL(__udelay);
34
35void __ndelay(unsigned long nsecs)
36{
37	__const_udelay(nsecs * 0x5UL); /* 2**32 / 1000000000 (rounded up) */
38}
39EXPORT_SYMBOL(__ndelay);
40