56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
|
/*
|
||
|
|
* Precise Delay Loops for avr32
|
||
|
|
*
|
||
|
|
* Copyright (C) 1993 Linus Torvalds
|
||
|
|
* Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
|
||
|
|
* Copyright (C) 2005-2006 Atmel Corporation
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
|
||
|
|
#include <asm/delay.h>
|
||
|
|
#include <asm/processor.h>
|
||
|
|
#include <asm/sysreg.h>
|
||
|
|
|
||
|
|
int read_current_timer(unsigned long *timer_value)
|
||
|
|
{
|
||
|
|
*timer_value = sysreg_read(COUNT);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
void __delay(unsigned long loops)
|
||
|
|
{
|
||
|
|
unsigned bclock, now;
|
||
|
|
|
||
|
|
bclock = sysreg_read(COUNT);
|
||
|
|
do {
|
||
|
|
now = sysreg_read(COUNT);
|
||
|
|
} while ((now - bclock) < loops);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline void __const_udelay(unsigned long xloops)
|
||
|
|
{
|
||
|
|
unsigned long long loops;
|
||
|
|
|
||
|
|
asm("mulu.d %0, %1, %2"
|
||
|
|
: "=r"(loops)
|
||
|
|
: "r"(current_cpu_data.loops_per_jiffy * HZ), "r"(xloops));
|
||
|
|
__delay(loops >> 32);
|
||
|
|
}
|
||
|
|
|
||
|
|
void __udelay(unsigned long usecs)
|
||
|
|
{
|
||
|
|
__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
|
||
|
|
}
|
||
|
|
|
||
|
|
void __ndelay(unsigned long nsecs)
|
||
|
|
{
|
||
|
|
__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
|
||
|
|
}
|