40 lines
812 B
C
40 lines
812 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
|
|
void __delay(unsigned long loops)
|
|
{
|
|
asm volatile (
|
|
"mov r0, r0\n"
|
|
"1:declt %0\n"
|
|
"bf 1b"
|
|
: "=r"(loops)
|
|
: "0"(loops));
|
|
}
|
|
EXPORT_SYMBOL(__delay);
|
|
|
|
void __const_udelay(unsigned long xloops)
|
|
{
|
|
unsigned long long loops;
|
|
|
|
loops = (unsigned long long)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);
|