/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2015 Semihalf.
 * Copyright (c) 2015 Stormshield.
 * All rights reserved.
 *
 * 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/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/priv.h>
#include <sys/rman.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/xhci.h>
#include <dev/usb/controller/xhcireg.h>

#include "generic_xhci.h"

#if __SIZEOF_LONG__ == 8
#define IS_DMA_32B      0
#elif __SIZEOF_LONG__ == 4
#define IS_DMA_32B      1
#else
#error unsupported long size
#endif

int
generic_xhci_attach(device_t dev)
{
        struct xhci_softc *sc = device_get_softc(dev);
        int err = 0, rid = 0;

        sc->sc_bus.parent = dev;
        sc->sc_bus.devices = sc->sc_devices;
        sc->sc_bus.devices_max = XHCI_MAX_DEVICES;

        sc->sc_io_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
            RF_ACTIVE);
        if (sc->sc_io_res == NULL) {
                device_printf(dev, "Failed to map memory\n");
                generic_xhci_detach(dev);
                return (ENXIO);
        }

        sc->sc_io_tag = rman_get_bustag(sc->sc_io_res);
        sc->sc_io_hdl = rman_get_bushandle(sc->sc_io_res);
        sc->sc_io_size = rman_get_size(sc->sc_io_res);

        sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
            RF_SHAREABLE | RF_ACTIVE);
        if (sc->sc_irq_res == NULL) {
                device_printf(dev, "Failed to allocate IRQ\n");
                generic_xhci_detach(dev);
                return (ENXIO);
        }

        sc->sc_bus.bdev = device_add_child(dev, "usbus", DEVICE_UNIT_ANY);
        if (sc->sc_bus.bdev == NULL) {
                device_printf(dev, "Failed to add USB device\n");
                generic_xhci_detach(dev);
                return (ENXIO);
        }

        device_set_ivars(sc->sc_bus.bdev, &sc->sc_bus);

        sprintf(sc->sc_vendor, XHCI_HC_VENDOR);
        device_set_desc(sc->sc_bus.bdev, XHCI_HC_DEVSTR);

        err = bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
            NULL, (driver_intr_t *)xhci_interrupt, sc, &sc->sc_intr_hdl);
        if (err != 0) {
                device_printf(dev, "Failed to setup error IRQ, %d\n", err);
                sc->sc_intr_hdl = NULL;
                generic_xhci_detach(dev);
                return (err);
        }

        err = xhci_init(sc, dev,
            (sc->sc_quirks & XHCI_QUIRK_DMA_32B) == 0 ? IS_DMA_32B : 1);
        if (err != 0) {
                device_printf(dev, "Failed to init XHCI, with error %d\n", err);
                generic_xhci_detach(dev);
                return (ENXIO);
        }

        err = xhci_start_controller(sc);
        if (err != 0) {
                device_printf(dev, "Failed to start XHCI controller, with error %d\n", err);
                generic_xhci_detach(dev);
                return (ENXIO);
        }

        err = device_probe_and_attach(sc->sc_bus.bdev);
        if (err != 0) {
                device_printf(dev, "Failed to initialize USB, with error %d\n", err);
                generic_xhci_detach(dev);
                return (ENXIO);
        }

        return (0);
}

int
generic_xhci_detach(device_t dev)
{
        struct xhci_softc *sc = device_get_softc(dev);
        int err;

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

        if (sc->sc_irq_res != NULL && sc->sc_intr_hdl != NULL) {
                err = bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr_hdl);
                if (err != 0)
                        device_printf(dev, "Could not tear down irq, %d\n",
                            err);
                sc->sc_intr_hdl = NULL;
        }

        if (sc->sc_irq_res != NULL) {
                bus_release_resource(dev, SYS_RES_IRQ,
                    rman_get_rid(sc->sc_irq_res), sc->sc_irq_res);
                sc->sc_irq_res = NULL;
        }

        if (sc->sc_io_res != NULL) {
                bus_release_resource(dev, SYS_RES_MEMORY,
                    rman_get_rid(sc->sc_io_res), sc->sc_io_res);
                sc->sc_io_res = NULL;
        }

        xhci_uninit(sc);

        return (0);
}

static device_method_t xhci_methods[] = {
        /* Device interface */
        DEVMETHOD(device_attach, generic_xhci_attach),
        DEVMETHOD(device_detach, generic_xhci_detach),
        DEVMETHOD(device_suspend, bus_generic_suspend),
        DEVMETHOD(device_resume, bus_generic_resume),
        DEVMETHOD(device_shutdown, bus_generic_shutdown),

        DEVMETHOD_END
};

driver_t generic_xhci_driver = {
        "xhci",
        xhci_methods,
        sizeof(struct xhci_softc),
};