42 строки
798 B
C
42 строки
798 B
C
// 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);
|