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