1 /* $NetBSD: wdog.c,v 1.7 2011/07/10 00:03:53 matt Exp $ */
2 /*-
3 * Copyright (c) 2006 Urbana-Champaign Independent Media Center.
4 * Copyright (c) 2006 Garrett D'Amore.
5 * All rights reserved.
6 *
7 * Portions of this code were written by Garrett D'Amore for the
8 * Champaign-Urbana Community Wireless Network Project.
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above
16 * copyright notice, this list of conditions and the following
17 * disclaimer in the documentation and/or other materials provided
18 * with the distribution.
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgements:
21 * This product includes software developed by the Urbana-Champaign
22 * Independent Media Center.
23 * This product includes software developed by Garrett D'Amore.
24 * 4. Urbana-Champaign Independent Media Center's name and Garrett
25 * D'Amore's name may not be used to endorse or promote products
26 * derived from this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT
29 * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR
30 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
31 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT
33 * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
36 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
37 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
38 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
39 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
40 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 */
42 /*
43 * Copyright (c) 2002 Wasabi Systems, Inc.
44 * All rights reserved.
45 *
46 * Written by Jason R. Thorpe and Simon Burge for Wasabi Systems, Inc.
47 *
48 * Redistribution and use in source and binary forms, with or without
49 * modification, are permitted provided that the following conditions
50 * are met:
51 * 1. Redistributions of source code must retain the above copyright
52 * notice, this list of conditions and the following disclaimer.
53 * 2. Redistributions in binary form must reproduce the above copyright
54 * notice, this list of conditions and the following disclaimer in the
55 * documentation and/or other materials provided with the distribution.
56 * 3. All advertising materials mentioning features or use of this software
57 * must display the following acknowledgement:
58 * This product includes software developed for the NetBSD Project by
59 * Wasabi Systems, Inc.
60 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
61 * or promote products derived from this software without specific prior
62 * written permission.
63 *
64 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
65 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
66 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
67 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
68 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
69 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
70 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
71 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
72 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
73 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
74 * POSSIBILITY OF SUCH DAMAGE.
75 */
76
77 /*
78 * Watchdog timer support for the AR531x.
79 */
80
81 #include <sys/cdefs.h>
82 __KERNEL_RCSID(0, "$NetBSD: wdog.c,v 1.7 2011/07/10 00:03:53 matt Exp $");
83
84 #include <sys/param.h>
85 #include <sys/cpu.h>
86 #include <sys/device.h>
87 #include <sys/wdog.h>
88
89 #include <mips/atheros/include/platform.h>
90
91 #include <dev/sysmon/sysmonvar.h>
92
93 #ifndef WDOG_DEFAULT_PERIOD
94 #define WDOG_DEFAULT_PERIOD 5
95 #endif
96
97 static int wdog_match(device_t, cfdata_t, void *);
98 static void wdog_attach(device_t, device_t, void *);
99 static int wdog_tickle(struct sysmon_wdog *);
100 static int wdog_setmode(struct sysmon_wdog *);
101
102 struct wdog_softc {
103 struct sysmon_wdog sc_smw;
104 int sc_wdog_period;
105 int sc_wdog_max;
106 uint32_t sc_wdog_reload;
107 uint32_t sc_mult;
108 };
109
110 CFATTACH_DECL_NEW(wdog, sizeof(struct wdog_softc),
111 wdog_match, wdog_attach, NULL, NULL);
112
113 static int
wdog_match(device_t parent,struct cfdata * cf,void * aux)114 wdog_match(device_t parent, struct cfdata *cf, void *aux)
115 {
116
117 return (1);
118 }
119
120 static void
wdog_attach(device_t parent,device_t self,void * aux)121 wdog_attach(device_t parent, device_t self, void *aux)
122 {
123 struct wdog_softc *sc = device_private(self);
124
125 sc->sc_mult = atheros_get_bus_freq();
126 sc->sc_wdog_period = WDOG_DEFAULT_PERIOD;
127 sc->sc_wdog_max = 0xffffffffU / sc->sc_mult;
128 sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
129 aprint_normal(": %d second period\n", sc->sc_wdog_period);
130
131 sc->sc_smw.smw_name = device_xname(self);
132 sc->sc_smw.smw_cookie = sc;
133 sc->sc_smw.smw_setmode = wdog_setmode;
134 sc->sc_smw.smw_tickle = wdog_tickle;
135 sc->sc_smw.smw_period = sc->sc_wdog_period;
136
137 if (sysmon_wdog_register(&sc->sc_smw) != 0) {
138 aprint_error_dev(self,
139 "unable to register with sysmon\n");
140 }
141 }
142
143 static int
wdog_tickle(struct sysmon_wdog * smw)144 wdog_tickle(struct sysmon_wdog *smw)
145 {
146 struct wdog_softc *sc = smw->smw_cookie;
147
148 atheros_wdog_reload(sc->sc_wdog_reload);
149 return (0);
150 }
151
152 static int
wdog_setmode(struct sysmon_wdog * smw)153 wdog_setmode(struct sysmon_wdog *smw)
154 {
155 struct wdog_softc *sc = smw->smw_cookie;
156
157 if ((smw->smw_mode & WDOG_MODE_MASK) == WDOG_MODE_DISARMED) {
158 atheros_wdog_reload(0);
159 } else {
160
161 if (smw->smw_period == WDOG_PERIOD_DEFAULT)
162 smw->smw_period = sc->sc_wdog_period;
163 else if (smw->smw_period != sc->sc_wdog_period) {
164 /*
165 * we can't set watchdog periods in excess of
166 * the processor maximum.
167 */
168 if (smw->smw_period > sc->sc_wdog_max) {
169 return EOPNOTSUPP;
170 }
171 sc->sc_wdog_period = smw->smw_period;
172 sc->sc_wdog_reload = sc->sc_wdog_period * sc->sc_mult;
173 }
174
175 atheros_wdog_reload(sc->sc_wdog_reload);
176 }
177
178 return (0);
179 }
180