2 * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following 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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/eventhandler.h>
32 #include <sys/systm.h>
33 #include <sys/watchdog.h>
34 #include <sys/reboot.h>
36 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
42 #include <dev/ofw/openfirm.h>
43 #include <dev/ofw/ofw_bus.h>
44 #include <dev/ofw/ofw_bus_subr.h>
46 #include <machine/bus.h>
47 #include <machine/machdep.h>
49 #include <arm/allwinner/aw_wdog.h>
51 #define READ(_sc, _r) bus_read_4((_sc)->res, (_r))
52 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
54 #define A10_WDOG_CTRL 0x00
55 #define A31_WDOG_CTRL 0x10
56 #define WDOG_CTRL_RESTART (1 << 0)
57 #define A31_WDOG_CTRL_KEY (0xa57 << 1)
58 #define A10_WDOG_MODE 0x04
59 #define A31_WDOG_MODE 0x18
60 #define A10_WDOG_MODE_INTVL_SHIFT 3
61 #define A31_WDOG_MODE_INTVL_SHIFT 4
62 #define A10_WDOG_MODE_RST_EN (1 << 1)
63 #define WDOG_MODE_EN (1 << 0)
64 #define A31_WDOG_CONFIG 0x14
65 #define A31_WDOG_CONFIG_RST_EN_SYSTEM (1 << 0)
66 #define A31_WDOG_CONFIG_RST_EN_INT (2 << 0)
68 struct aw_wdog_interval {
69 uint64_t milliseconds;
73 struct aw_wdog_interval wd_intervals[] = {
86 { 0, 0 } /* sentinel */
89 static struct aw_wdog_softc *aw_wdog_sc = NULL;
91 struct aw_wdog_softc {
93 struct resource * res;
96 uint32_t wdog_ctrl_key;
98 uint8_t wdog_mode_intvl_shift;
101 uint8_t wdog_config_value;
104 #define A10_WATCHDOG 1
105 #define A31_WATCHDOG 2
107 static struct ofw_compat_data compat_data[] = {
108 {"allwinner,sun4i-a10-wdt", A10_WATCHDOG},
109 {"allwinner,sun6i-a31-wdt", A31_WATCHDOG},
113 static void aw_wdog_watchdog_fn(void *, u_int, int *);
114 static void aw_wdog_shutdown_fn(void *, int);
117 aw_wdog_probe(device_t dev)
120 if (!ofw_bus_status_okay(dev))
122 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
124 device_set_desc(dev, "Allwinner A10 Watchdog");
125 return (BUS_PROBE_DEFAULT);
127 device_set_desc(dev, "Allwinner A31 Watchdog");
128 return (BUS_PROBE_DEFAULT);
134 aw_wdog_attach(device_t dev)
136 struct aw_wdog_softc *sc;
139 if (aw_wdog_sc != NULL)
142 sc = device_get_softc(dev);
146 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
147 if (sc->res == NULL) {
148 device_printf(dev, "could not allocate memory resource\n");
154 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
156 sc->wdog_ctrl = A10_WDOG_CTRL;
157 sc->wdog_mode = A10_WDOG_MODE;
158 sc->wdog_mode_intvl_shift = A10_WDOG_MODE_INTVL_SHIFT;
159 sc->wdog_mode_en = A10_WDOG_MODE_RST_EN | WDOG_MODE_EN;
162 sc->wdog_ctrl = A31_WDOG_CTRL;
163 sc->wdog_ctrl_key = A31_WDOG_CTRL_KEY;
164 sc->wdog_mode = A31_WDOG_MODE;
165 sc->wdog_mode_intvl_shift = A31_WDOG_MODE_INTVL_SHIFT;
166 sc->wdog_mode_en = WDOG_MODE_EN;
167 sc->wdog_config = A31_WDOG_CONFIG;
168 sc->wdog_config_value = A31_WDOG_CONFIG_RST_EN_SYSTEM;
171 bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
175 mtx_init(&sc->mtx, "AW Watchdog", "aw_wdog", MTX_DEF);
176 EVENTHANDLER_REGISTER(watchdog_list, aw_wdog_watchdog_fn, sc, 0);
177 EVENTHANDLER_REGISTER(shutdown_final, aw_wdog_shutdown_fn, sc,
178 SHUTDOWN_PRI_LAST - 1);
184 aw_wdog_watchdog_fn(void *private, u_int cmd, int *error)
186 struct aw_wdog_softc *sc;
196 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
198 while (wd_intervals[i].milliseconds &&
199 (ms > wd_intervals[i].milliseconds))
201 if (wd_intervals[i].milliseconds) {
202 WRITE(sc, sc->wdog_mode,
203 (wd_intervals[i].value << sc->wdog_mode_intvl_shift) |
205 WRITE(sc, sc->wdog_ctrl,
206 WDOG_CTRL_RESTART | sc->wdog_ctrl_key);
208 WRITE(sc, sc->wdog_config,
209 sc->wdog_config_value);
215 * disable watchdog as watchdog(9) requires
217 device_printf(sc->dev,
218 "Can't arm, timeout is more than 16 sec\n");
219 mtx_unlock(&sc->mtx);
220 WRITE(sc, sc->wdog_mode, 0);
225 WRITE(sc, sc->wdog_mode, 0);
227 mtx_unlock(&sc->mtx);
231 aw_wdog_shutdown_fn(void *private, int howto)
233 if ((howto & (RB_POWEROFF|RB_HALT)) == 0)
234 aw_wdog_watchdog_reset();
238 aw_wdog_watchdog_reset(void)
241 if (aw_wdog_sc == NULL) {
242 printf("Reset: watchdog device has not been initialized\n");
246 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_mode,
247 (wd_intervals[0].value << aw_wdog_sc->wdog_mode_intvl_shift) |
248 aw_wdog_sc->wdog_mode_en);
249 if (aw_wdog_sc->wdog_config)
250 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_config,
251 aw_wdog_sc->wdog_config_value);
252 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_ctrl,
253 WDOG_CTRL_RESTART | aw_wdog_sc->wdog_ctrl_key);
259 static device_method_t aw_wdog_methods[] = {
260 DEVMETHOD(device_probe, aw_wdog_probe),
261 DEVMETHOD(device_attach, aw_wdog_attach),
266 static driver_t aw_wdog_driver = {
269 sizeof(struct aw_wdog_softc),
271 static devclass_t aw_wdog_devclass;
273 DRIVER_MODULE(aw_wdog, simplebus, aw_wdog_driver, aw_wdog_devclass, 0, 0);