root / prex-0.9.0 / bsp / hal / ppc / arch / clock.c @ 03e9c04a
History | View | Annotate | Download (2 KB)
1 |
/*-
|
---|---|
2 |
* Copyright (c) 2009, Kohsuke Ohtani
|
3 |
* All rights reserved.
|
4 |
*
|
5 |
* Redistribution and use in source and binary forms, with or without
|
6 |
* modification, are permitted provided that the following conditions
|
7 |
* are met:
|
8 |
* 1. Redistributions of source code must retain the above copyright
|
9 |
* notice, this list of conditions and the following disclaimer.
|
10 |
* 2. Redistributions in binary form must reproduce the above copyright
|
11 |
* notice, this list of conditions and the following disclaimer in the
|
12 |
* documentation and/or other materials provided with the distribution.
|
13 |
* 3. Neither the name of the author nor the names of any co-contributors
|
14 |
* may be used to endorse or promote products derived from this software
|
15 |
* without specific prior written permission.
|
16 |
*
|
17 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
18 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
19 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
20 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
21 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
22 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
23 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
24 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
25 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
26 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
27 |
* SUCH DAMAGE.
|
28 |
*/
|
29 |
|
30 |
/*
|
31 |
* clock.c - clock driver for Power PC decrementer.
|
32 |
*/
|
33 |
|
34 |
#include <sys/ipl.h> |
35 |
#include <kernel.h> |
36 |
#include <timer.h> |
37 |
#include <irq.h> |
38 |
#include <cpufunc.h> |
39 |
#include <sys/ipl.h> |
40 |
|
41 |
#define DECR_COUNT 1000 |
42 |
|
43 |
/*
|
44 |
* Timer handler.
|
45 |
*/
|
46 |
int
|
47 |
clock_isr(void *arg)
|
48 |
{ |
49 |
int s;
|
50 |
|
51 |
/* Reset decrementer */
|
52 |
set_decr(DECR_COUNT); |
53 |
|
54 |
s = splhigh(); |
55 |
timer_handler(); |
56 |
splx(s); |
57 |
|
58 |
return INT_DONE;
|
59 |
} |
60 |
|
61 |
/*
|
62 |
* Initialize clock H/W.
|
63 |
*/
|
64 |
void
|
65 |
clock_init(void)
|
66 |
{ |
67 |
|
68 |
DPRINTF(("clock_init\n"));
|
69 |
set_decr(DECR_COUNT); |
70 |
} |