blob: c2f4a07dcda182d446ae49ed122b570f1a173efe [file] [log] [blame]
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -07001/*
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>
Andrew Morton941e4922008-02-06 01:36:42 -080015#include <linux/timex.h>
Haavard Skinnemoen3fc0eb42006-12-08 12:55:03 +010016#include <linux/param.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070017#include <linux/types.h>
Andrew Morton941e4922008-02-06 01:36:42 -080018#include <linux/init.h>
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070019
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070020#include <asm/processor.h>
21#include <asm/sysreg.h>
22
Greg Kroah-Hartmanb881bc42012-12-21 14:06:37 -080023int read_current_timer(unsigned long *timer_value)
Haavard Skinnemoen5f97f7f2006-09-25 23:32:13 -070024{
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}