projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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) | |
| d6bb7a1a MS |
31 | : "0" (loops) |
| 32 | : "cc"); | |
| b920de1b DH |
33 | } |
| 34 | EXPORT_SYMBOL(__delay); | |
| 35 | ||
| 36 | /* | |
| 37 | * handle a delay specified in terms of microseconds | |
| 38 | */ | |
| 39 | void __udelay(unsigned long usecs) | |
| 40 | { | |
| 368dd5ac | 41 | unsigned long start, stop, cnt; |
| b920de1b DH |
42 | |
| 43 | /* usecs * CLK / 1E6 */ | |
| 44 | stop = __muldiv64u(usecs, MN10300_TSCCLK, 1000000); | |
| 368dd5ac | 45 | start = TMTSCBC; |
| b920de1b DH |
46 | |
| 47 | do { | |
| 368dd5ac AT |
48 | cnt = start - TMTSCBC; |
| 49 | } while (cnt < stop); | |
| b920de1b DH |
50 | } |
| 51 | EXPORT_SYMBOL(__udelay); |