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
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/*
* arch/ubicom32/include/asm/delay.h
* Definition of delay routines for Ubicom32 architecture.
*
* (C) Copyright 2009, Ubicom, Inc.
*
* This file is part of the Ubicom32 Linux Kernel Port.
*
* The Ubicom32 Linux Kernel Port is free software: you can redistribute
* it and/or modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* The Ubicom32 Linux Kernel Port is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with the Ubicom32 Linux Kernel Port. If not,
* see <http://www.gnu.org/licenses/>.
*
* Ubicom32 implementation derived from (with many thanks):
* arch/m68knommu
* arch/blackfin
* arch/parisc
*/
#ifndef _ASM_UBICOM32_DELAY_H
#define _ASM_UBICOM32_DELAY_H
#include <asm/param.h>
#include <asm/ip5000.h>
static inline void __delay(unsigned long loops)
{
if (loops == 0) {
return;
}
asm volatile (
"1: add.4 %0, #-1, %0 \n\t"
" jmpne.t 1b \n\t"
: "+d" (loops)
);
}
/*
* Ubicom32 processor uses fixed 12MHz external OSC.
* So we use that as reference to count 12 cycles/us
*/
extern unsigned long loops_per_jiffy;
static inline void _udelay(unsigned long usecs)
{
#if defined(CONFIG_UBICOM32_V4) || defined(CONFIG_UBICOM32_V3)
asm volatile (
" add.4 d15, 0(%0), %1 \n\t"
" sub.4 #0, 0(%0), d15 \n\t"
" jmpmi.w.f .-4 \n\t"
:
: "a"(TIMER_BASE + TIMER_MPTVAL), "d"(usecs * (12000000/1000000))
: "d15"
);
#else
BUG();
#endif
}
/*
* Moved the udelay() function into library code, no longer inlined.
*/
extern void udelay(unsigned long usecs);
#endif /* _ASM_UBICOM32_DELAY_H */
|
