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
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/* $NetBSD: i80321_wdog.c,v 1.6 2003/07/15 00:24:54 lukem Exp $ */
/*-
* Copyright (c) 2005 Olivier Houchard
* Copyright (c) 2002 Wasabi Systems, Inc.
* All rights reserved.
*
* Written by Jason R. Thorpe for Wasabi Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project by
* Wasabi Systems, Inc.
* 4. The name of Wasabi Systems, Inc. may not be used to endorse
* or promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Watchdog timer support for the Intel i80321 I/O processor.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/watchdog.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <machine/cpufunc.h>
#include <machine/machdep.h>
#include <arm/xscale/i80321/i80321reg.h>
#include <arm/xscale/i80321/i80321var.h>
struct iopwdog_softc {
device_t dev;
int armed;
int wdog_period;
};
static __inline void
wdtcr_write(uint32_t val)
{
__asm __volatile("mcr p6, 0, %0, c7, c1, 0"
:
: "r" (val));
}
static void
iopwdog_tickle(void *arg)
{
struct iopwdog_softc *sc = arg;
if (!sc->armed)
return;
wdtcr_write(WDTCR_ENABLE1);
wdtcr_write(WDTCR_ENABLE2);
}
static int
iopwdog_probe(device_t dev)
{
struct iopwdog_softc *sc = device_get_softc(dev);
char buf[128];
/*
* XXX Should compute the period based on processor speed.
* For a 600MHz XScale core, the wdog must be tickled approx.
* every 7 seconds.
*/
sc->wdog_period = 7;
sprintf(buf, "i80321 Watchdog, must be tickled every %d seconds",
sc->wdog_period);
device_set_desc_copy(dev, buf);
return (0);
}
static void
iopwdog_watchdog_fn(void *private, u_int cmd, int *error)
{
struct iopwdog_softc *sc = private;
cmd &= WD_INTERVAL;
if (cmd > 0 && cmd <= 63
&& (uint64_t)1 << (cmd & WD_INTERVAL) <=
(uint64_t)sc->wdog_period * 1000000000) {
/* Valid value -> Enable watchdog */
iopwdog_tickle(sc);
sc->armed = 1;
*error = 0;
} else {
/* XXX Can't disable this watchdog? */
if (sc->armed)
*error = EOPNOTSUPP;
else if (cmd > 0)
*error = EINVAL;
}
}
static int
iopwdog_attach(device_t dev)
{
struct iopwdog_softc *sc = device_get_softc(dev);
sc->dev = dev;
sc->armed = 0;
EVENTHANDLER_REGISTER(watchdog_list, iopwdog_watchdog_fn, sc, 0);
return (0);
}
static device_method_t iopwdog_methods[] = {
DEVMETHOD(device_probe, iopwdog_probe),
DEVMETHOD(device_attach, iopwdog_attach),
{0, 0},
};
static driver_t iopwdog_driver = {
"iopwdog",
iopwdog_methods,
sizeof(struct iopwdog_softc),
};
static devclass_t iopwdog_devclass;
DRIVER_MODULE(iopwdog, iq, iopwdog_driver, iopwdog_devclass, 0, 0);
|
