blob: 5d3329f4dcce46edfbb6d348d7667a1ac9cc30c6 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
#ifndef __ALPHA_DELAY_H
#define __ALPHA_DELAY_H
#include <linux/config.h>
#include <asm/param.h>
#include <asm/smp.h>
/*
* Copyright (C) 1993, 2000 Linus Torvalds
*
* Delay routines, using a pre-computed "loops_per_jiffy" value.
*/
/*
* Use only for very small delays (< 1 msec).
*
* The active part of our cycle counter is only 32-bits wide, and
* we're treating the difference between two marks as signed. On
* a 1GHz box, that's about 2 seconds.
*/
extern __inline__ void
__delay(int loops)
{
int tmp;
__asm__ __volatile__(
" rpcc %0\n"
" addl %1,%0,%1\n"
"1: rpcc %0\n"
" subl %1,%0,%0\n"
" bgt %0,1b"
: "=&r" (tmp), "=r" (loops) : "1"(loops));
}
extern __inline__ void
__udelay(unsigned long usecs, unsigned long lpj)
{
usecs *= (((unsigned long)HZ << 32) / 1000000) * lpj;
__delay((long)usecs >> 32);
}
#ifdef CONFIG_SMP
#define udelay(u) __udelay((u), cpu_data[smp_processor_id()].loops_per_jiffy)
#else
#define udelay(u) __udelay((u), loops_per_jiffy)
#endif
#endif /* defined(__ALPHA_DELAY_H) */
|
