1/*
 2 * delay.h - delay functions
 3 *
 4 * Copyright (c) 2004-2007 Analog Devices Inc.
 5 *
 6 * Licensed under the GPL-2 or later.
 7 */
 8
 9#ifndef __ASM_DELAY_H__
10#define __ASM_DELAY_H__
11
12#include <mach/anomaly.h>
13
14static inline void __delay(unsigned long loops)
15{
16__asm__ __volatile__ (
17			"LSETUP(1f, 1f) LC0 = %0;"
18			"1: NOP;"
19			:
20			: "a" (loops)
21			: "LT0", "LB0", "LC0"
22		);
23}
24
25#include <linux/param.h>	/* needed for HZ */
26
27/*
28 * close approximation borrowed from m68knommu to avoid 64-bit math
29 */
30
31#define	HZSCALE		(268435456 / (1000000/HZ))
32
33static inline unsigned long __to_delay(unsigned long scale)
34{
35	extern unsigned long loops_per_jiffy;
36	return (((scale * HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6;
37}
38
39static inline void udelay(unsigned long usecs)
40{
41	__delay(__to_delay(usecs));
42}
43
44static inline void ndelay(unsigned long nsecs)
45{
46	__delay(__to_delay(1) * nsecs / 1000);
47}
48
49#define ndelay ndelay
50
51#endif