2 * Copyright (c) 2012, 2013 The FreeBSD Foundation
5 * This software was developed by Oleksandr Rybalko under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
39 #include <sys/resource.h>
41 #include <sys/watchdog.h>
43 #include <machine/bus.h>
44 #include <machine/intr.h>
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/openfirm.h>
48 #include <dev/ofw/ofw_bus.h>
49 #include <dev/ofw/ofw_bus_subr.h>
50 #include <machine/fdt.h>
52 #include <arm/freescale/imx/imx_wdogreg.h>
54 struct imx_wdog_softc {
57 bus_space_tag_t sc_bst;
58 bus_space_handle_t sc_bsh;
59 struct resource *sc_res[2];
63 static struct resource_spec imx_wdog_spec[] = {
64 { SYS_RES_MEMORY, 0, RF_ACTIVE },
65 { SYS_RES_IRQ, 0, RF_ACTIVE },
69 static void imx_watchdog(void *, u_int, int *);
70 static int imx_wdog_probe(device_t);
71 static int imx_wdog_attach(device_t);
73 static device_method_t imx_wdog_methods[] = {
74 DEVMETHOD(device_probe, imx_wdog_probe),
75 DEVMETHOD(device_attach, imx_wdog_attach),
79 static driver_t imx_wdog_driver = {
82 sizeof(struct imx_wdog_softc),
84 static devclass_t imx_wdog_devclass;
85 DRIVER_MODULE(imx_wdog, simplebus, imx_wdog_driver, imx_wdog_devclass, 0, 0);
89 imx_watchdog(void *arg, u_int cmd, int *error)
91 struct imx_wdog_softc *sc;
96 mtx_lock(&sc->sc_mtx);
98 /* Refresh counter, since we feels good */
99 WRITE(sc, WDOG_SR_REG, WDOG_SR_STEP1);
100 WRITE(sc, WDOG_SR_REG, WDOG_SR_STEP2);
102 /* We don't require precession, so "-10" (/1024) is ok */
103 timeout = (1 << ((cmd & WD_INTERVAL) - 10)) / 1000000;
104 if (timeout > 1 && timeout < 128) {
105 if (timeout != sc->sc_timeout) {
106 device_printf(sc->sc_dev,
107 "WARNING: watchdog can't be disabled!!!");
108 sc->sc_timeout = timeout;
109 reg = READ(sc, WDOG_CR_REG);
110 reg &= ~WDOG_CR_WT_MASK;
111 reg |= (timeout << (WDOG_CR_WT_SHIFT + 1)) &
113 WRITE(sc, WDOG_CR_REG, reg);
114 /* Refresh counter */
115 WRITE(sc, WDOG_SR_REG, WDOG_SR_STEP1);
116 WRITE(sc, WDOG_SR_REG, WDOG_SR_STEP2);
122 device_printf(sc->sc_dev, "Can not be disabled.\n");
125 mtx_unlock(&sc->sc_mtx);
130 imx_wdog_probe(device_t dev)
133 if (!ofw_bus_is_compatible(dev, "fsl,imx51-wdt") &&
134 !ofw_bus_is_compatible(dev, "fsl,imx53-wdt"))
137 device_set_desc(dev, "Freescale i.MX5xx Watchdog Timer");
142 imx_wdog_attach(device_t dev)
144 struct imx_wdog_softc *sc;
146 sc = device_get_softc(dev);
149 if (bus_alloc_resources(dev, imx_wdog_spec, sc->sc_res)) {
150 device_printf(dev, "could not allocate resources\n");
154 mtx_init(&sc->sc_mtx, device_get_nameunit(dev), "imx_wdt", MTX_DEF);
157 sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
158 sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
160 /* TODO: handle interrupt */
162 EVENTHANDLER_REGISTER(watchdog_list, imx_watchdog, sc, 0);