1 /*-
2 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
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 unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 /*
29 * Watchdog driver for AR71xx
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: stable/10/sys/mips/atheros/ar71xx_wdog.c 265999 2014-05-14 01:35:43Z ian $");
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/watchdog.h>
38 #include <sys/bus.h>
39 #include <sys/kernel.h>
40 #include <sys/module.h>
41 #include <sys/sysctl.h>
42
43 #include <mips/atheros/ar71xxreg.h>
44 #include <mips/atheros/ar71xx_cpudef.h>
45
46 struct ar71xx_wdog_softc {
47 device_t dev;
48 int armed;
49 int reboot_from_watchdog;
50 int debug;
51 };
52
53 static void
ar71xx_wdog_watchdog_fn(void * private,u_int cmd,int * error)54 ar71xx_wdog_watchdog_fn(void *private, u_int cmd, int *error)
55 {
56 struct ar71xx_wdog_softc *sc = private;
57 uint64_t timer_val;
58
59 cmd &= WD_INTERVAL;
60 if (sc->debug)
61 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: cmd: %x\n", cmd);
62 if (cmd > 0) {
63 timer_val = (uint64_t)(1ULL << cmd) * ar71xx_ahb_freq() /
64 1000000000;
65 if (sc->debug)
66 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
67 /*
68 * Load timer with large enough value to prevent spurious
69 * reset
70 */
71 ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
72 ar71xx_ahb_freq() * 10);
73 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
74 RST_WDOG_ACTION_RESET);
75 ATH_WRITE_REG(AR71XX_RST_WDOG_TIMER,
76 (timer_val & 0xffffffff));
77 sc->armed = 1;
78 *error = 0;
79 } else {
80 if (sc->debug)
81 device_printf(sc->dev, "ar71xx_wdog_watchdog_fn: disarming\n");
82 if (sc->armed) {
83 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL,
84 RST_WDOG_ACTION_NOACTION);
85 sc->armed = 0;
86 }
87 }
88 }
89
90 static int
ar71xx_wdog_probe(device_t dev)91 ar71xx_wdog_probe(device_t dev)
92 {
93
94 device_set_desc(dev, "Atheros AR71XX watchdog timer");
95 return (BUS_PROBE_NOWILDCARD);
96 }
97
98 static void
ar71xx_wdog_sysctl(device_t dev)99 ar71xx_wdog_sysctl(device_t dev)
100 {
101 struct ar71xx_wdog_softc *sc = device_get_softc(dev);
102
103 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
104 struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
105
106 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
107 "debug", CTLFLAG_RW, &sc->debug, 0,
108 "enable watchdog debugging");
109 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
110 "armed", CTLFLAG_RD, &sc->armed, 0,
111 "whether the watchdog is armed");
112 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
113 "reboot_from_watchdog", CTLFLAG_RD, &sc->reboot_from_watchdog, 0,
114 "whether the system rebooted from the watchdog");
115 }
116
117
118 static int
ar71xx_wdog_attach(device_t dev)119 ar71xx_wdog_attach(device_t dev)
120 {
121 struct ar71xx_wdog_softc *sc = device_get_softc(dev);
122
123 /* Initialise */
124 sc->reboot_from_watchdog = 0;
125 sc->armed = 0;
126 sc->debug = 0;
127
128 if (ATH_READ_REG(AR71XX_RST_WDOG_CONTROL) & RST_WDOG_LAST) {
129 device_printf (dev,
130 "Previous reset was due to watchdog timeout\n");
131 sc->reboot_from_watchdog = 1;
132 }
133
134 ATH_WRITE_REG(AR71XX_RST_WDOG_CONTROL, RST_WDOG_ACTION_NOACTION);
135
136 sc->dev = dev;
137 EVENTHANDLER_REGISTER(watchdog_list, ar71xx_wdog_watchdog_fn, sc, 0);
138 ar71xx_wdog_sysctl(dev);
139
140 return (0);
141 }
142
143 static device_method_t ar71xx_wdog_methods[] = {
144 DEVMETHOD(device_probe, ar71xx_wdog_probe),
145 DEVMETHOD(device_attach, ar71xx_wdog_attach),
146 {0, 0},
147 };
148
149 static driver_t ar71xx_wdog_driver = {
150 "ar71xx_wdog",
151 ar71xx_wdog_methods,
152 sizeof(struct ar71xx_wdog_softc),
153 };
154 static devclass_t ar71xx_wdog_devclass;
155
156 DRIVER_MODULE(ar71xx_wdog, nexus, ar71xx_wdog_driver, ar71xx_wdog_devclass, 0, 0);
157