1/*
2 *      Precise Delay Loops for avr32
3 *
4 *      Copyright (C) 1993 Linus Torvalds
5 *      Copyright (C) 1997 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
6 *	Copyright (C) 2005-2006 Atmel Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/delay.h>
14#include <linux/module.h>
15#include <linux/timex.h>
16#include <linux/param.h>
17#include <linux/types.h>
18#include <linux/init.h>
19
20#include <asm/processor.h>
21#include <asm/sysreg.h>
22
23int read_current_timer(unsigned long *timer_value)
24{
25	*timer_value = sysreg_read(COUNT);
26	return 0;
27}
28
29void __delay(unsigned long loops)
30{
31	unsigned bclock, now;
32
33	bclock = sysreg_read(COUNT);
34	do {
35		now = sysreg_read(COUNT);
36	} while ((now - bclock) < loops);
37}
38
39inline void __const_udelay(unsigned long xloops)
40{
41	unsigned long long loops;
42
43	asm("mulu.d %0, %1, %2"
44	    : "=r"(loops)
45	    : "r"(current_cpu_data.loops_per_jiffy * HZ), "r"(xloops));
46	__delay(loops >> 32);
47}
48
49void __udelay(unsigned long usecs)
50{
51	__const_udelay(usecs * 0x000010c7); /* 2**32 / 1000000 (rounded up) */
52}
53
54void __ndelay(unsigned long nsecs)
55{
56	__const_udelay(nsecs * 0x00005); /* 2**32 / 1000000000 (rounded up) */
57}
58