1/* $Id: delay.h,v 1.1.1.1 2008/10/15 03:27:26 james26_jang Exp $
2 * delay.h: Linux delay routines on the V9.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu).
5 */
6
7#ifndef __SPARC64_DELAY_H
8#define __SPARC64_DELAY_H
9
10#include <linux/config.h>
11#include <linux/param.h>
12
13#ifndef __ASSEMBLY__
14
15#ifdef CONFIG_SMP
16#include <asm/smp.h>
17#else
18extern unsigned long loops_per_jiffy;
19#endif
20
21extern __inline__ void __delay(unsigned long loops)
22{
23	__asm__ __volatile__(
24"	b,pt	%%xcc, 1f\n"
25"	 cmp	%0, 0\n"
26"	.align	32\n"
27"1:\n"
28"	bne,pt	%%xcc, 1b\n"
29"	 subcc	%0, 1, %0\n"
30	: "=&r" (loops)
31	: "0" (loops)
32	: "cc");
33}
34
35extern __inline__ void __udelay(unsigned long usecs, unsigned long lps)
36{
37	usecs *= 0x00000000000010c6UL;		/* 2**32 / 1000000 */
38
39	__asm__ __volatile__(
40"	mulx	%1, %2, %0\n"
41"	srlx	%0, 32, %0\n"
42	: "=r" (usecs)
43	: "r" (usecs), "r" (lps));
44
45	__delay(usecs * HZ);
46}
47
48#ifdef CONFIG_SMP
49#define __udelay_val cpu_data[smp_processor_id()].udelay_val
50#else
51#define __udelay_val loops_per_jiffy
52#endif
53
54#define udelay(usecs) __udelay((usecs),__udelay_val)
55
56#endif /* !__ASSEMBLY__ */
57
58#endif /* defined(__SPARC64_DELAY_H) */
59