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/systm.h>
32 #include <sys/watchdog.h>
33 #include <sys/reboot.h>
35 #include <sys/kernel.h>
37 #include <sys/module.h>
38 #include <sys/mutex.h>
41 #include <dev/ofw/openfirm.h>
42 #include <dev/ofw/ofw_bus.h>
43 #include <dev/ofw/ofw_bus_subr.h>
45 #include <machine/bus.h>
46 #include <machine/machdep.h>
48 #include <arm/allwinner/aw_wdog.h>
50 #define READ(_sc, _r) bus_read_4((_sc)->res, (_r))
51 #define WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
53 #define A10_WDOG_CTRL 0x00
54 #define A31_WDOG_CTRL 0x10
55 #define WDOG_CTRL_RESTART (1 << 0)
56 #define A31_WDOG_CTRL_KEY (0xa57 << 1)
57 #define A10_WDOG_MODE 0x04
58 #define A31_WDOG_MODE 0x18
59 #define A10_WDOG_MODE_INTVL_SHIFT 3
60 #define A31_WDOG_MODE_INTVL_SHIFT 4
61 #define A10_WDOG_MODE_RST_EN (1 << 1)
62 #define WDOG_MODE_EN (1 << 0)
63 #define A31_WDOG_CONFIG 0x14
64 #define A31_WDOG_CONFIG_RST_EN_SYSTEM (1 << 0)
65 #define A31_WDOG_CONFIG_RST_EN_INT (2 << 0)
67 struct aw_wdog_interval {
68 uint64_t milliseconds;
72 struct aw_wdog_interval wd_intervals[] = {
85 { 0, 0 } /* sentinel */
88 static struct aw_wdog_softc *aw_wdog_sc = NULL;
90 struct aw_wdog_softc {
92 struct resource * res;
95 uint32_t wdog_ctrl_key;
97 uint8_t wdog_mode_intvl_shift;
100 uint8_t wdog_config_value;
103 #define A10_WATCHDOG 1
104 #define A31_WATCHDOG 2
106 static struct ofw_compat_data compat_data[] = {
107 {"allwinner,sun4i-a10-wdt", A10_WATCHDOG},
108 {"allwinner,sun6i-a31-wdt", A31_WATCHDOG},
112 static void aw_wdog_watchdog_fn(void *, u_int, int *);
113 static void aw_wdog_shutdown_fn(void *, int);
116 aw_wdog_probe(device_t dev)
119 if (!ofw_bus_status_okay(dev))
121 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
123 device_set_desc(dev, "Allwinner A10 Watchdog");
124 return (BUS_PROBE_DEFAULT);
126 device_set_desc(dev, "Allwinner A31 Watchdog");
127 return (BUS_PROBE_DEFAULT);
133 aw_wdog_attach(device_t dev)
135 struct aw_wdog_softc *sc;
138 if (aw_wdog_sc != NULL)
141 sc = device_get_softc(dev);
145 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
146 if (sc->res == NULL) {
147 device_printf(dev, "could not allocate memory resource\n");
153 switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
155 sc->wdog_ctrl = A10_WDOG_CTRL;
156 sc->wdog_mode = A10_WDOG_MODE;
157 sc->wdog_mode_intvl_shift = A10_WDOG_MODE_INTVL_SHIFT;
158 sc->wdog_mode_en = A10_WDOG_MODE_RST_EN | WDOG_MODE_EN;
161 sc->wdog_ctrl = A31_WDOG_CTRL;
162 sc->wdog_ctrl_key = A31_WDOG_CTRL_KEY;
163 sc->wdog_mode = A31_WDOG_MODE;
164 sc->wdog_mode_intvl_shift = A31_WDOG_MODE_INTVL_SHIFT;
165 sc->wdog_mode_en = WDOG_MODE_EN;
166 sc->wdog_config = A31_WDOG_CONFIG;
167 sc->wdog_config_value = A31_WDOG_CONFIG_RST_EN_SYSTEM;
170 bus_release_resource(dev, SYS_RES_MEMORY, rid, sc->res);
174 mtx_init(&sc->mtx, "AW Watchdog", "aw_wdog", MTX_DEF);
175 EVENTHANDLER_REGISTER(watchdog_list, aw_wdog_watchdog_fn, sc, 0);
176 EVENTHANDLER_REGISTER(shutdown_final, aw_wdog_shutdown_fn, sc,
177 SHUTDOWN_PRI_LAST - 1);
183 aw_wdog_watchdog_fn(void *private, u_int cmd, int *error)
185 struct aw_wdog_softc *sc;
195 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
197 while (wd_intervals[i].milliseconds &&
198 (ms > wd_intervals[i].milliseconds))
200 if (wd_intervals[i].milliseconds) {
201 WRITE(sc, sc->wdog_mode,
202 (wd_intervals[i].value << sc->wdog_mode_intvl_shift) |
204 WRITE(sc, sc->wdog_ctrl,
205 WDOG_CTRL_RESTART | sc->wdog_ctrl_key);
207 WRITE(sc, sc->wdog_config,
208 sc->wdog_config_value);
214 * disable watchdog as watchdog(9) requires
216 device_printf(sc->dev,
217 "Can't arm, timeout is more than 16 sec\n");
218 mtx_unlock(&sc->mtx);
219 WRITE(sc, sc->wdog_mode, 0);
224 WRITE(sc, sc->wdog_mode, 0);
226 mtx_unlock(&sc->mtx);
230 aw_wdog_shutdown_fn(void *private, int howto)
232 if ((howto & (RB_POWEROFF|RB_HALT)) == 0)
233 aw_wdog_watchdog_reset();
237 aw_wdog_watchdog_reset(void)
240 if (aw_wdog_sc == NULL) {
241 printf("Reset: watchdog device has not been initialized\n");
245 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_mode,
246 (wd_intervals[0].value << aw_wdog_sc->wdog_mode_intvl_shift) |
247 aw_wdog_sc->wdog_mode_en);
248 if (aw_wdog_sc->wdog_config)
249 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_config,
250 aw_wdog_sc->wdog_config_value);
251 WRITE(aw_wdog_sc, aw_wdog_sc->wdog_ctrl,
252 WDOG_CTRL_RESTART | aw_wdog_sc->wdog_ctrl_key);
258 static device_method_t aw_wdog_methods[] = {
259 DEVMETHOD(device_probe, aw_wdog_probe),
260 DEVMETHOD(device_attach, aw_wdog_attach),
265 static driver_t aw_wdog_driver = {
268 sizeof(struct aw_wdog_softc),
270 static devclass_t aw_wdog_devclass;
272 DRIVER_MODULE(aw_wdog, simplebus, aw_wdog_driver, aw_wdog_devclass, 0, 0);