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b920de1b DH |
1 | /* MN10300 Short delay interpolation routines |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #include <linux/module.h> | |
12 | #include <linux/sched.h> | |
13 | #include <linux/delay.h> | |
14 | #include <asm/div64.h> | |
15 | ||
16 | /* | |
17 | * basic delay loop | |
18 | */ | |
19 | void __delay(unsigned long loops) | |
20 | { | |
21 | int d0; | |
22 | ||
23 | asm volatile( | |
24 | " bra 1f \n" | |
25 | " .align 4 \n" | |
26 | "1: bra 2f \n" | |
27 | " .align 4 \n" | |
28 | "2: add -1,%0 \n" | |
29 | " bne 2b \n" | |
30 | : "=&d" (d0) | |
31 | : "0" (loops)); | |
32 | } | |
33 | EXPORT_SYMBOL(__delay); | |
34 | ||
35 | /* | |
36 | * handle a delay specified in terms of microseconds | |
37 | */ | |
38 | void __udelay(unsigned long usecs) | |
39 | { | |
40 | signed long ioclk, stop; | |
41 | ||
42 | /* usecs * CLK / 1E6 */ | |
43 | stop = __muldiv64u(usecs, MN10300_TSCCLK, 1000000); | |
44 | stop = TMTSCBC - stop; | |
45 | ||
46 | do { | |
47 | ioclk = TMTSCBC; | |
48 | } while (stop < ioclk); | |
49 | } | |
50 | EXPORT_SYMBOL(__udelay); |