/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2012 Hans Petter Selasky.
 *
 * 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/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/condvar.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/rman.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>

#include <dev/usb/usb_core.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_util.h>

#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>

#include <dev/usb/controller/dwc_otg.h>
#include <dev/usb/controller/dwc_otg_fdt.h>

static device_probe_t dwc_otg_probe;

static struct ofw_compat_data compat_data[] = {
        { "synopsys,designware-hs-otg2",        1 },
        { "snps,dwc2",                          1 },
        { NULL,                                 0 }
};

static int
dwc_otg_probe(device_t dev)
{

        if (!ofw_bus_status_okay(dev))
                return (ENXIO);

        if (!ofw_bus_search_compatible(dev, compat_data)->ocd_data)
                return (ENXIO);

        device_set_desc(dev, "DWC OTG 2.0 integrated USB controller");

        return (BUS_PROBE_DEFAULT);
}

static int
dwc_otg_irq_index(device_t dev, int *rid)
{
        int idx, rv;
        phandle_t node;

        node = ofw_bus_get_node(dev);
        rv = ofw_bus_find_string_index(node, "interrupt-names", "usb", &idx);
        if (rv != 0)
                return (rv);
        *rid = idx;
        return (0);
}

int
dwc_otg_attach(device_t dev)
{
        struct dwc_otg_fdt_softc *sc = device_get_softc(dev);
        char usb_mode[24];
        int err;
        int rid;

        sc->sc_otg.sc_bus.parent = dev;

        /* get USB mode, if any */
        if (OF_getprop(ofw_bus_get_node(dev), "dr_mode",
            &usb_mode, sizeof(usb_mode)) > 0) {
                /* ensure proper zero termination */
                usb_mode[sizeof(usb_mode) - 1] = 0;

                if (strcasecmp(usb_mode, "host") == 0)
                        sc->sc_otg.sc_mode = DWC_MODE_HOST;
                else if (strcasecmp(usb_mode, "peripheral") == 0)
                        sc->sc_otg.sc_mode = DWC_MODE_DEVICE;
                else if (strcasecmp(usb_mode, "otg") != 0) {
                        device_printf(dev, "Invalid FDT dr_mode: %s\n",
                            usb_mode);
                }
        }

        rid = 0;
        sc->sc_otg.sc_io_res =
            bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);

        if (!(sc->sc_otg.sc_io_res))
                goto error;

        /*
         * brcm,bcm2708-usb FDT provides two interrupts, we need only the USB
         * interrupt (VC_USB).  The latest FDT for it provides an
         * interrupt-names property and swapped them around, while older ones
         * did not have interrupt-names and put the usb interrupt in the second
         * position.  We'll attempt to use interrupt-names first with a fallback
         * to the old method of assuming the index based on the compatible
         * string.
         */
        if (dwc_otg_irq_index(dev, &rid) != 0)
                rid = ofw_bus_is_compatible(dev, "brcm,bcm2708-usb") ? 1 : 0;
        sc->sc_otg.sc_irq_res =
            bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
        if (sc->sc_otg.sc_irq_res == NULL)
                goto error;

        err = dwc_otg_init(&sc->sc_otg);
        if (err == 0) {
                err = device_probe_and_attach(sc->sc_otg.sc_bus.bdev);
        }
        if (err)
                goto error;

        return (0);

error:
        dwc_otg_detach(dev);
        return (ENXIO);
}

int
dwc_otg_detach(device_t dev)
{
        struct dwc_otg_fdt_softc *sc = device_get_softc(dev);
        int error;

        /* during module unload there are lots of children leftover */
        error = bus_generic_detach(dev);
        if (error != 0)
                return (error);

        if (sc->sc_otg.sc_irq_res && sc->sc_otg.sc_intr_hdl) {
                /*
                 * only call dwc_otg_uninit() after dwc_otg_init()
                 */
                dwc_otg_uninit(&sc->sc_otg);

                bus_teardown_intr(dev, sc->sc_otg.sc_irq_res,
                    sc->sc_otg.sc_intr_hdl);
                sc->sc_otg.sc_intr_hdl = NULL;
        }
        /* free IRQ channel, if any */
        if (sc->sc_otg.sc_irq_res) {
                bus_release_resource(dev, SYS_RES_IRQ, 0,
                    sc->sc_otg.sc_irq_res);
                sc->sc_otg.sc_irq_res = NULL;
        }
        /* free memory resource, if any */
        if (sc->sc_otg.sc_io_res) {
                bus_release_resource(dev, SYS_RES_MEMORY, 0,
                    sc->sc_otg.sc_io_res);
                sc->sc_otg.sc_io_res = NULL;
        }
        usb_bus_mem_free_all(&sc->sc_otg.sc_bus, NULL);

        return (0);
}

static device_method_t dwc_otg_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe, dwc_otg_probe),
        DEVMETHOD(device_attach, dwc_otg_attach),
        DEVMETHOD(device_detach, dwc_otg_detach),
        DEVMETHOD(device_suspend, bus_generic_suspend),
        DEVMETHOD(device_resume, bus_generic_resume),
        DEVMETHOD(device_shutdown, bus_generic_shutdown),

        DEVMETHOD_END
};

driver_t dwc_otg_driver = {
        .name = "dwcotg",
        .methods = dwc_otg_methods,
        .size = sizeof(struct dwc_otg_fdt_softc),
};

DRIVER_MODULE(dwcotg, simplebus, dwc_otg_driver, 0, 0);
MODULE_DEPEND(dwcotg, usb, 1, 1, 1);