1 /*-
2 * Copyright (c) 2016, Hiroki Mori
3 * Copyright (c) 2009, Oleksandr Tymoshenko <gonzo@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
11 * disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * Watchdog driver for AR5315
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/12.0/sys/mips/atheros/ar531x/ar5315_wdog.c 306675 2016-10-04 16:27:36Z adrian $");
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/watchdog.h>
39 #include <sys/bus.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/sysctl.h>
43
44 #include <mips/atheros/ar531x/ar5315reg.h>
45 #include <mips/atheros/ar531x/ar5315_cpudef.h>
46
47 struct ar5315_wdog_softc {
48 device_t dev;
49 int armed;
50 int reboot_from_watchdog;
51 int debug;
52 };
53
54 static void
55 ar5315_wdog_watchdog_fn(void *private, u_int cmd, int *error)
56 {
57 struct ar5315_wdog_softc *sc = private;
58 uint64_t timer_val;
59
60 cmd &= WD_INTERVAL;
61 if (sc->debug)
62 device_printf(sc->dev, "ar5315_wdog_watchdog_fn: cmd: %x\n", cmd);
63 if (cmd > 0) {
64 timer_val = (uint64_t)(1ULL << cmd) * ar531x_ahb_freq() /
65 1000000000;
66 if (sc->debug)
67 device_printf(sc->dev, "ar5315_wdog_watchdog_fn: programming timer: %jx\n", (uintmax_t) timer_val);
68 /*
69 * Load timer with large enough value to prevent spurious
70 * reset
71 */
72 ATH_WRITE_REG(ar531x_wdog_timer(),
73 ar531x_ahb_freq() * 10);
74 ATH_WRITE_REG(ar531x_wdog_ctl(),
75 AR5315_WDOG_CTL_RESET);
76 ATH_WRITE_REG(ar531x_wdog_timer(),
77 (timer_val & 0xffffffff));
78 sc->armed = 1;
79 *error = 0;
80 } else {
81 if (sc->debug)
82 device_printf(sc->dev, "ar5315_wdog_watchdog_fn: disarming\n");
83 if (sc->armed) {
84 ATH_WRITE_REG(ar531x_wdog_ctl(),
85 AR5315_WDOG_CTL_IGNORE);
86 sc->armed = 0;
87 }
88 }
89 }
90
91 static int
92 ar5315_wdog_probe(device_t dev)
93 {
94
95 device_set_desc(dev, "Atheros AR531x watchdog timer");
96 return (0);
97 }
98
99 static void
100 ar5315_wdog_sysctl(device_t dev)
101 {
102 struct ar5315_wdog_softc *sc = device_get_softc(dev);
103
104 struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(sc->dev);
105 struct sysctl_oid *tree = device_get_sysctl_tree(sc->dev);
106
107 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
108 "debug", CTLFLAG_RW, &sc->debug, 0,
109 "enable watchdog debugging");
110 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
111 "armed", CTLFLAG_RD, &sc->armed, 0,
112 "whether the watchdog is armed");
113 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
114 "reboot_from_watchdog", CTLFLAG_RD, &sc->reboot_from_watchdog, 0,
115 "whether the system rebooted from the watchdog");
116 }
117
118
119 static int
120 ar5315_wdog_attach(device_t dev)
121 {
122 struct ar5315_wdog_softc *sc = device_get_softc(dev);
123
124 /* Initialise */
125 sc->reboot_from_watchdog = 0;
126 sc->armed = 0;
127 sc->debug = 0;
128 ATH_WRITE_REG(ar531x_wdog_ctl(), AR5315_WDOG_CTL_IGNORE);
129
130 sc->dev = dev;
131 EVENTHANDLER_REGISTER(watchdog_list, ar5315_wdog_watchdog_fn, sc, 0);
132 ar5315_wdog_sysctl(dev);
133
134 return (0);
135 }
136
137 static device_method_t ar5315_wdog_methods[] = {
138 DEVMETHOD(device_probe, ar5315_wdog_probe),
139 DEVMETHOD(device_attach, ar5315_wdog_attach),
140 DEVMETHOD_END
141 };
142
143 static driver_t ar5315_wdog_driver = {
144 "ar5315_wdog",
145 ar5315_wdog_methods,
146 sizeof(struct ar5315_wdog_softc),
147 };
148 static devclass_t ar5315_wdog_devclass;
149
150 DRIVER_MODULE(ar5315_wdog, apb, ar5315_wdog_driver, ar5315_wdog_devclass, 0, 0);
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