2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following 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.
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
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/watchdog.h>
35 #include <sys/eventhandler.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>
48 #include <machine/fdt.h>
50 #include <arm/rockchip/rk30xx_wdog.h>
53 #define RK30_WDT_BASE 0x2004c000
54 #define RK30_WDT_PSIZE 0x100
57 #define RK30_WDT_READ(_sc, _r) bus_read_4((_sc)->res, (_r))
58 #define RK30_WDT_WRITE(_sc, _r, _v) bus_write_4((_sc)->res, (_r), (_v))
60 #define WDOG_CTRL 0x00
61 #define WDOG_CTRL_EN (1 << 0)
62 #define WDOG_CTRL_RSP_MODE (1 << 1)
63 #define WDOG_CTRL_RST_PULSE (4 << 2)
64 #define WDOG_CTRL_RST 0xa
65 #define WDOG_TORR 0x04
66 #define WDOG_TORR_INTVL_SHIFT 0
67 #define WDOG_CCVR 0x08
69 #define WDOG_CRR_PWD 0x76
70 #define WDOG_STAT 0x10
73 static struct rk30_wd_softc *rk30_wd_sc = NULL;
75 struct rk30_wd_softc {
82 static void rk30_wd_watchdog_fn(void *private, u_int cmd, int *error);
85 rk30_wd_probe(device_t dev)
88 if (!ofw_bus_status_okay(dev))
91 if (ofw_bus_is_compatible(dev, "rockchip,rk30xx-wdt")) {
92 device_set_desc(dev, "Rockchip RK30XX Watchdog");
93 return (BUS_PROBE_DEFAULT);
100 rk30_wd_attach(device_t dev)
102 struct rk30_wd_softc *sc;
107 if (rk30_wd_sc != NULL)
110 sc = device_get_softc(dev);
113 node = ofw_bus_get_node(sc->dev);
114 if (OF_getencprop(node, "clock-frequency", &cell, sizeof(cell)) > 0)
115 sc->freq = cell / 1000000;
120 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
121 if (sc->res == NULL) {
122 device_printf(dev, "could not allocate memory resource\n");
127 mtx_init(&sc->mtx, "RK30XX Watchdog", "rk30_wd", MTX_DEF);
128 EVENTHANDLER_REGISTER(watchdog_list, rk30_wd_watchdog_fn, sc, 0);
134 rk30_wd_watchdog_fn(void *private, u_int cmd, int *error)
136 struct rk30_wd_softc *sc;
146 ms = ((uint64_t)1 << (cmd & WD_INTERVAL)) / 1000000;
147 m = 0xffff / sc->freq;
148 max = 0x7fffffff / sc->freq + 1;
150 while (m < max && m < ms) {
155 RK30_WDT_WRITE(sc, WDOG_TORR,
156 i << WDOG_TORR_INTVL_SHIFT);
157 RK30_WDT_WRITE(sc, WDOG_CTRL,
158 WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE |
159 WDOG_CTRL_RST_PULSE);
160 RK30_WDT_WRITE(sc, WDOG_CRR, WDOG_CRR_PWD);
163 device_printf(sc->dev, "Can not be disabled\n");
164 mtx_unlock(&sc->mtx);
165 RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
170 RK30_WDT_WRITE(sc, WDOG_CTRL, WDOG_CTRL_RST);
172 mtx_unlock(&sc->mtx);
176 rk30_wd_watchdog_reset(void)
178 bus_space_handle_t bsh;
180 bus_space_map(fdtbus_bs_tag, RK30_WDT_BASE, RK30_WDT_PSIZE, 0, &bsh);
181 bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_TORR, 0);
182 bus_space_write_4(fdtbus_bs_tag, bsh, WDOG_CTRL,
183 WDOG_CTRL_EN | WDOG_CTRL_RSP_MODE | WDOG_CTRL_RST_PULSE);
188 static device_method_t rk30_wd_methods[] = {
189 DEVMETHOD(device_probe, rk30_wd_probe),
190 DEVMETHOD(device_attach, rk30_wd_attach),
195 static driver_t rk30_wd_driver = {
198 sizeof(struct rk30_wd_softc),
200 static devclass_t rk30_wd_devclass;
202 DRIVER_MODULE(rk30_wd, simplebus, rk30_wd_driver, rk30_wd_devclass, 0, 0);