1/*
 2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 3 *
 4 *   This program is free software; you can redistribute it and/or
 5 *   modify it under the terms of the GNU General Public License
 6 *   as published by the Free Software Foundation, version 2.
 7 *
 8 *   This program is distributed in the hope that it will be useful, but
 9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/thread_info.h>
18#include <asm/timex.h>
19
20void __udelay(unsigned long usecs)
21{
22	if (usecs > ULONG_MAX / 1000) {
23		WARN_ON_ONCE(usecs > ULONG_MAX / 1000);
24		usecs = ULONG_MAX / 1000;
25	}
26	__ndelay(usecs * 1000);
27}
28EXPORT_SYMBOL(__udelay);
29
30void __ndelay(unsigned long nsecs)
31{
32	cycles_t target = get_cycles();
33	target += ns2cycles(nsecs);
34	while (get_cycles() < target)
35		cpu_relax();
36}
37EXPORT_SYMBOL(__ndelay);
38
39void __delay(unsigned long cycles)
40{
41	cycles_t target = get_cycles() + cycles;
42	while (get_cycles() < target)
43		cpu_relax();
44}
45EXPORT_SYMBOL(__delay);

 1/*
 2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 3 *
 4 *   This program is free software; you can redistribute it and/or
 5 *   modify it under the terms of the GNU General Public License
 6 *   as published by the Free Software Foundation, version 2.
 7 *
 8 *   This program is distributed in the hope that it will be useful, but
 9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14
15#include <linux/module.h>
16#include <linux/delay.h>
17#include <linux/thread_info.h>
18#include <asm/timex.h>
19
20void __udelay(unsigned long usecs)
21{
22	if (usecs > ULONG_MAX / 1000) {
23		WARN_ON_ONCE(usecs > ULONG_MAX / 1000);
24		usecs = ULONG_MAX / 1000;
25	}
26	__ndelay(usecs * 1000);
27}
28EXPORT_SYMBOL(__udelay);
29
30void __ndelay(unsigned long nsecs)
31{
32	cycles_t target = get_cycles();
33	target += ns2cycles(nsecs);
34	while (get_cycles() < target)
35		cpu_relax();
36}
37EXPORT_SYMBOL(__ndelay);
38
39void __delay(unsigned long cycles)
40{
41	cycles_t target = get_cycles() + cycles;
42	while (get_cycles() < target)
43		cpu_relax();
44}
45EXPORT_SYMBOL(__delay);