1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice unmodified, this list of conditions, and the following
12 * disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
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 * Watchdog driver for AR71xx
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/watchdog.h>
40 #include <sys/bus.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/sysctl.h>
44
45 #include <mips/atheros/ar71xxreg.h>
46 #include <mips/atheros/ar71xx_cpudef.h>
47
48 struct ar71xx_wdog_softc {
49 device_t dev;
50 int armed;
51 int reboot_from_watchdog;
52 int debug;
53 };
54
55 static void
56 ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
57 {
58 struct ar71xx_wdog_softc *sc = private;
59 uint64_t timer_val;
60
61 cmd &= WD_INTERVAL;
62 if (sc->debug)
63 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: cmd: %x\n", cmd);
64 if (cmd > 0) {
65 timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
66 1000000000;
67 if (sc->debug)
68 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
69 /*
70 * Load timer with large enough value to prevent spurious
71 * reset
72 */
73 ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
74 ar71xx_ahb_freq() * 10);
75 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
76 RST_WDOG_ACTION_RESET);
77 ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
78 (timer_val & 0xffffffff));
79 sc->armed = 1;
80 *error = 0;
81 } else {
82 if (sc->debug)
83 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: disarming\n");
84 if (sc->armed) {
85 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
86 RST_WDOG_ACTION_NOACTION);
87 sc->armed = 0;
88 }
89 }
90 }
91
92 static int
93 ar71xx_wdog_probe(device_t dev)
94 {
95
96 device_set_desc(dev, "Atheros AR71XX watchdog timer");
97 return (BUS_PROBE_NOWILDCARD);
98 }
99
100 static void
101 ar71xx_wdog_sysctl(device_t dev)
102 {
103 struct ar71xx_wdog_softc *sc = device_get_softc(dev);
104
105 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
106 struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
107
108 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
109 "debug", CTLFLAG_RW, &sc->debug, 0,
110 "enable watchdog debugging");
111 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
112 "armed", CTLFLAG_RD, &sc->armed, 0,
113 "whether the watchdog is armed");
114 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
115 "reboot_from_watchdog", CTLFLAG_RD, &sc->reboot_from_watchdog, 0,
116 "whether the system rebooted from the watchdog");
117 }
118
119
120 static int
121 ar71xx_wdog_attach(device_t dev)
122 {
123 struct ar71xx_wdog_softc *sc = device_get_softc(dev);
124
125 /* Initialise */
126 sc->reboot_from_watchdog = 0;
127 sc->armed = 0;
128 sc->debug = 0;
129
130 if (ATH_READ_REG(AR71XX_RST_WDOG_CONTROL) & RST_WDOG_LAST) {
131 device_printf (dev,
132 "Previous reset was due to watchdog timeout\n");
133 sc->reboot_from_watchdog = 1;
134 }
135
136 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
137
138 sc->dev = dev;
139 EVENTHANDLER_REGISTER(watchdog_list, ar71xx_wdog_watchdog_fn, sc, 0);
140 ar71xx_wdog_sysctl(dev);
141
142 return (0);
143 }
144
145 static device_method_t ar71xx_wdog_methods[] = {
146 DEVMETHOD(device_probe, ar71xx_wdog_probe),
147 DEVMETHOD(device_attach, ar71xx_wdog_attach),
148 {0, 0},
149 };
150
151 static driver_t ar71xx_wdog_driver = {
152 "ar71xx_wdog",
153 ar71xx_wdog_methods,
154 sizeof(struct ar71xx_wdog_softc),
155 };
156 static devclass_t ar71xx_wdog_devclass;
157
158 DRIVER_MODULE(ar71xx_wdog, nexus, ar71xx_wdog_driver, ar71xx_wdog_devclass, 0, 0);
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