175 lines
4.7 KiB
C
175 lines
4.7 KiB
C
/*-
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* Copyright (c) 2012, 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Oleksandr Rybalko under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/time.h>
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#include <sys/bus.h>
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#include <sys/resource.h>
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#include <sys/rman.h>
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#include <sys/watchdog.h>
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#include <machine/bus.h>
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#include <machine/intr.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <arm/freescale/imx/imx_wdogreg.h>
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struct imx_wdog_softc {
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struct mtx sc_mtx;
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device_t sc_dev;
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bus_space_tag_t sc_bst;
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bus_space_handle_t sc_bsh;
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struct resource *sc_res[2];
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uint32_t sc_timeout;
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};
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static struct resource_spec imx_wdog_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ SYS_RES_IRQ, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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static struct ofw_compat_data compat_data[] = {
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{"fsl,imx6sx-wdt", 1},
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{"fsl,imx6sl-wdt", 1},
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{"fsl,imx6q-wdt", 1},
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{"fsl,imx53-wdt", 1},
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{"fsl,imx51-wdt", 1},
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{"fsl,imx50-wdt", 1},
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{"fsl,imx35-wdt", 1},
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{"fsl,imx27-wdt", 1},
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{"fsl,imx25-wdt", 1},
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{"fsl,imx21-wdt", 1},
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{NULL, 0}
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};
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static void imx_watchdog(void *, u_int, int *);
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static int imx_wdog_probe(device_t);
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static int imx_wdog_attach(device_t);
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static device_method_t imx_wdog_methods[] = {
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DEVMETHOD(device_probe, imx_wdog_probe),
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DEVMETHOD(device_attach, imx_wdog_attach),
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DEVMETHOD_END
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};
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static driver_t imx_wdog_driver = {
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"imx_wdog",
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imx_wdog_methods,
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sizeof(struct imx_wdog_softc),
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};
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static devclass_t imx_wdog_devclass;
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DRIVER_MODULE(imx_wdog, simplebus, imx_wdog_driver, imx_wdog_devclass, 0, 0);
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#define RD2(_sc, _r) \
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bus_space_read_2((_sc)->sc_bst, (_sc)->sc_bsh, (_r))
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#define WR2(_sc, _r, _v) \
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bus_space_write_2((_sc)->sc_bst, (_sc)->sc_bsh, (_r), (_v))
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static void
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imx_watchdog(void *arg, u_int cmd, int *error)
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{
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struct imx_wdog_softc *sc;
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uint16_t reg;
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u_int timeout;
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sc = arg;
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mtx_lock(&sc->sc_mtx);
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if (cmd == 0) {
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if (bootverbose)
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device_printf(sc->sc_dev, "Can not be disabled.\n");
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*error = EOPNOTSUPP;
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} else {
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timeout = (u_int)((1ULL << (cmd & WD_INTERVAL)) / 1000000000U);
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if (timeout > 1 && timeout < 128) {
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if (timeout != sc->sc_timeout) {
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sc->sc_timeout = timeout;
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reg = RD2(sc, WDOG_CR_REG);
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reg &= ~WDOG_CR_WT_MASK;
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reg |= (timeout << (WDOG_CR_WT_SHIFT + 1)) &
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WDOG_CR_WT_MASK;
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WR2(sc, WDOG_CR_REG, reg | WDOG_CR_WDE);
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}
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/* Refresh counter */
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WR2(sc, WDOG_SR_REG, WDOG_SR_STEP1);
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WR2(sc, WDOG_SR_REG, WDOG_SR_STEP2);
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*error = 0;
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}
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}
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mtx_unlock(&sc->sc_mtx);
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}
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static int
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imx_wdog_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "Freescale i.MX Watchdog");
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return (0);
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}
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static int
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imx_wdog_attach(device_t dev)
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{
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struct imx_wdog_softc *sc;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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if (bus_alloc_resources(dev, imx_wdog_spec, sc->sc_res)) {
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device_printf(dev, "could not allocate resources\n");
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return (ENXIO);
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}
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mtx_init(&sc->sc_mtx, device_get_nameunit(dev), "imx_wdt", MTX_DEF);
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sc->sc_dev = dev;
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sc->sc_bst = rman_get_bustag(sc->sc_res[0]);
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sc->sc_bsh = rman_get_bushandle(sc->sc_res[0]);
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/* TODO: handle interrupt */
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EVENTHANDLER_REGISTER(watchdog_list, imx_watchdog, sc, 0);
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return (0);
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}
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