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 
__delay(unsigned long loops)14 static 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 
__to_delay(unsigned long scale)33 static 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 
udelay(unsigned long usecs)39 static inline void udelay(unsigned long usecs)
40 {
41 	__delay(__to_delay(usecs));
42 }
43 
ndelay(unsigned long nsecs)44 static inline void ndelay(unsigned long nsecs)
45 {
46 	__delay(__to_delay(1) * nsecs / 1000);
47 }
48 
49 #define ndelay ndelay
50 
51 #endif
52