53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
|
/* Copyright Altera Corporation (C) 2014. All rights reserved.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License, version 2,
|
||
|
|
* as published by the Free Software Foundation.
|
||
|
|
*
|
||
|
|
* This program is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
* GNU General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU General Public License
|
||
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <asm/delay.h>
|
||
|
|
#include <asm/param.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/timex.h>
|
||
|
|
|
||
|
|
void __delay(unsigned long cycles)
|
||
|
|
{
|
||
|
|
cycles_t start = get_cycles();
|
||
|
|
|
||
|
|
while ((get_cycles() - start) < cycles)
|
||
|
|
cpu_relax();
|
||
|
|
}
|
||
|
|
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);
|