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1da177e4 LT |
1 | /* |
2 | * arch/sh64/lib/udelay.c | |
3 | * | |
4 | * Delay routines, using a pre-computed "loops_per_jiffy" value. | |
5 | * | |
6 | * Copyright (C) 2000, 2001 Paolo Alberelli | |
7 | * Copyright (C) 2003, 2004 Paul Mundt | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General Public | |
10 | * License. See the file "COPYING" in the main directory of this archive | |
11 | * for more details. | |
12 | */ | |
13 | #include <linux/config.h> | |
14 | #include <linux/sched.h> | |
15 | #include <asm/param.h> | |
16 | ||
17 | extern unsigned long loops_per_jiffy; | |
18 | ||
19 | /* | |
20 | * Use only for very small delays (< 1 msec). | |
21 | * | |
22 | * The active part of our cycle counter is only 32-bits wide, and | |
23 | * we're treating the difference between two marks as signed. On | |
24 | * a 1GHz box, that's about 2 seconds. | |
25 | */ | |
26 | ||
27 | void __delay(int loops) | |
28 | { | |
29 | long long dummy; | |
30 | __asm__ __volatile__("gettr tr0, %1\n\t" | |
31 | "pta $+4, tr0\n\t" | |
32 | "addi %0, -1, %0\n\t" | |
33 | "bne %0, r63, tr0\n\t" | |
34 | "ptabs %1, tr0\n\t":"=r"(loops), | |
35 | "=r"(dummy) | |
36 | :"0"(loops)); | |
37 | } | |
38 | ||
39 | void __udelay(unsigned long long usecs, unsigned long lpj) | |
40 | { | |
41 | usecs *= (((unsigned long long) HZ << 32) / 1000000) * lpj; | |
42 | __delay((long long) usecs >> 32); | |
43 | } | |
44 | ||
45 | void __ndelay(unsigned long long nsecs, unsigned long lpj) | |
46 | { | |
47 | nsecs *= (((unsigned long long) HZ << 32) / 1000000000) * lpj; | |
48 | __delay((long long) nsecs >> 32); | |
49 | } | |
50 | ||
51 | void udelay(unsigned long usecs) | |
52 | { | |
53 | __udelay(usecs, loops_per_jiffy); | |
54 | } | |
55 | ||
56 | void ndelay(unsigned long nsecs) | |
57 | { | |
58 | __ndelay(nsecs, loops_per_jiffy); | |
59 | } | |
60 |