/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2008 Hans Petter Selasky <hselasky@FreeBSD.org>
 * 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.
 */

/*
 * This file contains the driver for the USS820 series USB Device
 * Controller
 *
 * NOTE: The datasheet does not document everything.
 */

#ifdef USB_GLOBAL_INCLUDE_FILE
#include USB_GLOBAL_INCLUDE_FILE
#else
#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/callout.h>
#include <sys/malloc.h>
#include <sys/priv.h>

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

#define USB_DEBUG_VAR uss820dcidebug

#include <dev/usb/usb_core.h>
#include <dev/usb/usb_debug.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_transfer.h>
#include <dev/usb/usb_device.h>
#include <dev/usb/usb_hub.h>
#include <dev/usb/usb_util.h>

#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#endif                  /* USB_GLOBAL_INCLUDE_FILE */

#include <dev/usb/controller/uss820dci.h>

#define USS820_DCI_BUS2SC(bus) \
    __containerof(bus, struct uss820dci_softc, sc_bus)

#define USS820_DCI_PC2SC(pc) \
   USS820_DCI_BUS2SC(USB_DMATAG_TO_XROOT((pc)->tag_parent)->bus)

#define USS820_DCI_THREAD_IRQ \
    (USS820_SSR_SUSPEND | USS820_SSR_RESUME | USS820_SSR_RESET)

#ifdef USB_DEBUG
static int uss820dcidebug = 0;

static SYSCTL_NODE(_hw_usb, OID_AUTO, uss820dci, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "USB uss820dci");
SYSCTL_INT(_hw_usb_uss820dci, OID_AUTO, debug, CTLFLAG_RWTUN,
    &uss820dcidebug, 0, "uss820dci debug level");
#endif

#define USS820_DCI_INTR_ENDPT 1

/* prototypes */

static const struct usb_bus_methods uss820dci_bus_methods;
static const struct usb_pipe_methods uss820dci_device_bulk_methods;
static const struct usb_pipe_methods uss820dci_device_ctrl_methods;
static const struct usb_pipe_methods uss820dci_device_intr_methods;
static const struct usb_pipe_methods uss820dci_device_isoc_fs_methods;

static uss820dci_cmd_t uss820dci_setup_rx;
static uss820dci_cmd_t uss820dci_data_rx;
static uss820dci_cmd_t uss820dci_data_tx;
static uss820dci_cmd_t uss820dci_data_tx_sync;
static void     uss820dci_device_done(struct usb_xfer *, usb_error_t);
static void     uss820dci_do_poll(struct usb_bus *);
static void     uss820dci_standard_done(struct usb_xfer *);
static void     uss820dci_intr_set(struct usb_xfer *, uint8_t);
static void     uss820dci_update_shared_1(struct uss820dci_softc *, uint8_t,
                    uint8_t, uint8_t);
static void     uss820dci_root_intr(struct uss820dci_softc *);

/*
 * Here is a list of what the USS820D chip can support. The main
 * limitation is that the sum of the buffer sizes must be less than
 * 1120 bytes.
 */
static const struct usb_hw_ep_profile
        uss820dci_ep_profile[] = {
        [0] = {
                .max_in_frame_size = 32,
                .max_out_frame_size = 32,
                .is_simplex = 0,
                .support_control = 1,
        },
        [1] = {
                .max_in_frame_size = 64,
                .max_out_frame_size = 64,
                .is_simplex = 0,
                .support_multi_buffer = 1,
                .support_bulk = 1,
                .support_interrupt = 1,
                .support_in = 1,
                .support_out = 1,
        },
        [2] = {
                .max_in_frame_size = 8,
                .max_out_frame_size = 8,
                .is_simplex = 0,
                .support_multi_buffer = 1,
                .support_bulk = 1,
                .support_interrupt = 1,
                .support_in = 1,
                .support_out = 1,
        },
        [3] = {
                .max_in_frame_size = 256,
                .max_out_frame_size = 256,
                .is_simplex = 0,
                .support_multi_buffer = 1,
                .support_isochronous = 1,
                .support_in = 1,
                .support_out = 1,
        },
};

static void
uss820dci_update_shared_1(struct uss820dci_softc *sc, uint8_t reg,
    uint8_t keep_mask, uint8_t set_mask)
{
        uint8_t temp;

        USS820_WRITE_1(sc, USS820_PEND, 1);
        temp = USS820_READ_1(sc, reg);
        temp &= (keep_mask);
        temp |= (set_mask);
        USS820_WRITE_1(sc, reg, temp);
        USS820_WRITE_1(sc, USS820_PEND, 0);
}

static void
uss820dci_get_hw_ep_profile(struct usb_device *udev,
    const struct usb_hw_ep_profile **ppf, uint8_t ep_addr)
{
        if (ep_addr == 0) {
                *ppf = uss820dci_ep_profile + 0;
        } else if (ep_addr < 5) {
                *ppf = uss820dci_ep_profile + 1;
        } else if (ep_addr < 7) {
                *ppf = uss820dci_ep_profile + 2;
        } else if (ep_addr == 7) {
                *ppf = uss820dci_ep_profile + 3;
        } else {
                *ppf = NULL;
        }
}

static void
uss820dci_pull_up(struct uss820dci_softc *sc)
{
        uint8_t temp;

        /* pullup D+, if possible */

        if (!sc->sc_flags.d_pulled_up &&
            sc->sc_flags.port_powered) {
                sc->sc_flags.d_pulled_up = 1;

                DPRINTF("\n");

                temp = USS820_READ_1(sc, USS820_MCSR);
                temp |= USS820_MCSR_DPEN;
                USS820_WRITE_1(sc, USS820_MCSR, temp);
        }
}

static void
uss820dci_pull_down(struct uss820dci_softc *sc)
{
        uint8_t temp;

        /* pulldown D+, if possible */

        if (sc->sc_flags.d_pulled_up) {
                sc->sc_flags.d_pulled_up = 0;

                DPRINTF("\n");

                temp = USS820_READ_1(sc, USS820_MCSR);
                temp &= ~USS820_MCSR_DPEN;
                USS820_WRITE_1(sc, USS820_MCSR, temp);
        }
}

static void
uss820dci_wakeup_peer(struct uss820dci_softc *sc)
{
        if (!(sc->sc_flags.status_suspend)) {
                return;
        }
        DPRINTFN(0, "not supported\n");
}

static void
uss820dci_set_address(struct uss820dci_softc *sc, uint8_t addr)
{
        DPRINTFN(5, "addr=%d\n", addr);

        USS820_WRITE_1(sc, USS820_FADDR, addr);
}

static uint8_t
uss820dci_setup_rx(struct uss820dci_softc *sc, struct uss820dci_td *td)
{
        struct usb_device_request req;
        uint16_t count;
        uint8_t rx_stat;
        uint8_t temp;

        /* select the correct endpoint */
        USS820_WRITE_1(sc, USS820_EPINDEX, td->ep_index);

        /* read out FIFO status */
        rx_stat = USS820_READ_1(sc, USS820_RXSTAT);

        DPRINTFN(5, "rx_stat=0x%02x rem=%u\n", rx_stat, td->remainder);

        if (!(rx_stat & USS820_RXSTAT_RXSETUP)) {
                goto not_complete;
        }
        /* clear did stall */
        td->did_stall = 0;

        /* clear stall and all I/O */
        uss820dci_update_shared_1(sc, USS820_EPCON,
            0xFF ^ (USS820_EPCON_TXSTL |
            USS820_EPCON_RXSTL |
            USS820_EPCON_RXIE |
            USS820_EPCON_TXOE), 0);

        /* clear end overwrite flag */
        uss820dci_update_shared_1(sc, USS820_RXSTAT,
            0xFF ^ USS820_RXSTAT_EDOVW, 0);

        /* get the packet byte count */
        count = USS820_READ_1(sc, USS820_RXCNTL);
        count |= (USS820_READ_1(sc, USS820_RXCNTH) << 8);
        count &= 0x3FF;

        /* verify data length */
        if (count != td->remainder) {
                DPRINTFN(0, "Invalid SETUP packet "
                    "length, %d bytes\n", count);
                goto setup_not_complete;
        }
        if (count != sizeof(req)) {
                DPRINTFN(0, "Unsupported SETUP packet "
                    "length, %d bytes\n", count);
                goto setup_not_complete;
        }
        /* receive data */
        bus_space_read_multi_1(sc->sc_io_tag, sc->sc_io_hdl,
            USS820_RXDAT * USS820_REG_STRIDE, (void *)&req, sizeof(req));

        /* read out FIFO status */
        rx_stat = USS820_READ_1(sc, USS820_RXSTAT);

        if (rx_stat & (USS820_RXSTAT_EDOVW |
            USS820_RXSTAT_STOVW)) {
                DPRINTF("new SETUP packet received\n");
                return (1);             /* not complete */
        }
        /* clear receive setup bit */
        uss820dci_update_shared_1(sc, USS820_RXSTAT,
            0xFF ^ (USS820_RXSTAT_RXSETUP |
            USS820_RXSTAT_EDOVW |
            USS820_RXSTAT_STOVW), 0);

        /* set RXFFRC bit */
        temp = USS820_READ_1(sc, USS820_RXCON);
        temp |= USS820_RXCON_RXFFRC;
        USS820_WRITE_1(sc, USS820_RXCON, temp);

        /* copy data into real buffer */
        usbd_copy_in(td->pc, 0, &req, sizeof(req));

        td->offset = sizeof(req);
        td->remainder = 0;

        /* sneak peek the set address */
        if ((req.bmRequestType == UT_WRITE_DEVICE) &&
            (req.bRequest == UR_SET_ADDRESS)) {
                sc->sc_dv_addr = req.wValue[0] & 0x7F;
        } else {
                sc->sc_dv_addr = 0xFF;
        }

        /* reset TX FIFO */
        temp = USS820_READ_1(sc, USS820_TXCON);
        temp |= USS820_TXCON_TXCLR;
        USS820_WRITE_1(sc, USS820_TXCON, temp);
        temp &= ~USS820_TXCON_TXCLR;
        USS820_WRITE_1(sc, USS820_TXCON, temp);

        return (0);                     /* complete */

setup_not_complete:

        /* set RXFFRC bit */
        temp = USS820_READ_1(sc, USS820_RXCON);
        temp |= USS820_RXCON_RXFFRC;
        USS820_WRITE_1(sc, USS820_RXCON, temp);

        /* FALLTHROUGH */

not_complete:
        /* abort any ongoing transfer */
        if (!td->did_stall) {
                DPRINTFN(5, "stalling\n");
                /* set stall */
                uss820dci_update_shared_1(sc, USS820_EPCON, 0xFF,
                    (USS820_EPCON_TXSTL | USS820_EPCON_RXSTL));

                td->did_stall = 1;
        }

        /* clear end overwrite flag, if any */
        if (rx_stat & USS820_RXSTAT_RXSETUP) {
                uss820dci_update_shared_1(sc, USS820_RXSTAT,
                    0xFF ^ (USS820_RXSTAT_EDOVW |
                    USS820_RXSTAT_STOVW |
                    USS820_RXSTAT_RXSETUP), 0);
        }
        return (1);                     /* not complete */
}

static uint8_t
uss820dci_data_rx(struct uss820dci_softc *sc, struct uss820dci_td *td)
{
        struct usb_page_search buf_res;
        uint16_t count;
        uint8_t rx_flag;
        uint8_t rx_stat;
        uint8_t rx_cntl;
        uint8_t to;
        uint8_t got_short;

        to = 2;                         /* don't loop forever! */
        got_short = 0;

        /* select the correct endpoint */
        USS820_WRITE_1(sc, USS820_EPINDEX, td->ep_index);

        /* check if any of the FIFO banks have data */
repeat:
        /* read out FIFO flag */
        rx_flag = USS820_READ_1(sc, USS820_RXFLG);
        /* read out FIFO status */
        rx_stat = USS820_READ_1(sc, USS820_RXSTAT);

        DPRINTFN(5, "rx_stat=0x%02x rx_flag=0x%02x rem=%u\n",
            rx_stat, rx_flag, td->remainder);

        if (rx_stat & (USS820_RXSTAT_RXSETUP |
            USS820_RXSTAT_RXSOVW |
            USS820_RXSTAT_EDOVW)) {
                if (td->remainder == 0 && td->ep_index == 0) {
                        /*
                         * We are actually complete and have
                         * received the next SETUP
                         */
                        DPRINTFN(5, "faking complete\n");
                        return (0);     /* complete */
                }
                /*
                 * USB Host Aborted the transfer.
                 */
                td->error = 1;
                return (0);             /* complete */
        }
        /* check for errors */
        if (rx_flag & (USS820_RXFLG_RXOVF |
            USS820_RXFLG_RXURF)) {
                DPRINTFN(5, "overflow or underflow\n");
                /* should not happen */
                td->error = 1;
                return (0);             /* complete */
        }
        /* check status */
        if (!(rx_flag & (USS820_RXFLG_RXFIF0 |
            USS820_RXFLG_RXFIF1))) {
                /* read out EPCON register */
                /* enable RX input */
                if (!td->did_enable) {
                        uss820dci_update_shared_1(USS820_DCI_PC2SC(td->pc),
                            USS820_EPCON, 0xFF, USS820_EPCON_RXIE);
                        td->did_enable = 1;
                }
                return (1);             /* not complete */
        }
        /* get the packet byte count */
        count = USS820_READ_1(sc, USS820_RXCNTL);
        count |= (USS820_READ_1(sc, USS820_RXCNTH) << 8);
        count &= 0x3FF;

        DPRINTFN(5, "count=0x%04x\n", count);

        /* verify the packet byte count */
        if (count != td->max_packet_size) {
                if (count < td->max_packet_size) {
                        /* we have a short packet */
                        td->short_pkt = 1;
                        got_short = 1;
                } else {
                        /* invalid USB packet */
                        td->error = 1;
                        return (0);     /* we are complete */
                }
        }
        /* verify the packet byte count */
        if (count > td->remainder) {
                /* invalid USB packet */
                td->error = 1;
                return (0);             /* we are complete */
        }
        while (count > 0) {
                usbd_get_page(td->pc, td->offset, &buf_res);

                /* get correct length */
                if (buf_res.length > count) {
                        buf_res.length = count;
                }
                /* receive data */
                bus_space_read_multi_1(sc->sc_io_tag, sc->sc_io_hdl,
                    USS820_RXDAT * USS820_REG_STRIDE, buf_res.buffer, buf_res.length);

                /* update counters */
                count -= buf_res.length;
                td->offset += buf_res.length;
                td->remainder -= buf_res.length;
        }

        /* set RXFFRC bit */
        rx_cntl = USS820_READ_1(sc, USS820_RXCON);
        rx_cntl |= USS820_RXCON_RXFFRC;
        USS820_WRITE_1(sc, USS820_RXCON, rx_cntl);

        /* check if we are complete */
        if ((td->remainder == 0) || got_short) {
                if (td->short_pkt) {
                        /* we are complete */
                        return (0);
                }
                /* else need to receive a zero length packet */
        }
        if (--to) {
                goto repeat;
        }
        return (1);                     /* not complete */
}

static uint8_t
uss820dci_data_tx(struct uss820dci_softc *sc, struct uss820dci_td *td)
{
        struct usb_page_search buf_res;
        uint16_t count;
        uint16_t count_copy;
        uint8_t rx_stat;
        uint8_t tx_flag;
        uint8_t to;

        /* select the correct endpoint */
        USS820_WRITE_1(sc, USS820_EPINDEX, td->ep_index);

        to = 2;                         /* don't loop forever! */

repeat:
        /* read out TX FIFO flags */
        tx_flag = USS820_READ_1(sc, USS820_TXFLG);

        DPRINTFN(5, "tx_flag=0x%02x rem=%u\n", tx_flag, td->remainder);

        if (td->ep_index == 0) {
                /* read out RX FIFO status last */
                rx_stat = USS820_READ_1(sc, USS820_RXSTAT);

                DPRINTFN(5, "rx_stat=0x%02x\n", rx_stat);

                if (rx_stat & (USS820_RXSTAT_RXSETUP |
                    USS820_RXSTAT_RXSOVW |
                    USS820_RXSTAT_EDOVW)) {
                        /*
                         * The current transfer was aborted by the USB
                         * Host:
                         */
                        td->error = 1;
                        return (0);             /* complete */
                }
        }
        if (tx_flag & (USS820_TXFLG_TXOVF |
            USS820_TXFLG_TXURF)) {
                td->error = 1;
                return (0);             /* complete */
        }
        if (tx_flag & USS820_TXFLG_TXFIF0) {
                if (tx_flag & USS820_TXFLG_TXFIF1) {
                        return (1);     /* not complete */
                }
        }
        if ((!td->support_multi_buffer) &&
            (tx_flag & (USS820_TXFLG_TXFIF0 |
            USS820_TXFLG_TXFIF1))) {
                return (1);             /* not complete */
        }
        count = td->max_packet_size;
        if (td->remainder < count) {
                /* we have a short packet */
                td->short_pkt = 1;
                count = td->remainder;
        }
        count_copy = count;
        while (count > 0) {
                usbd_get_page(td->pc, td->offset, &buf_res);

                /* get correct length */
                if (buf_res.length > count) {
                        buf_res.length = count;
                }
                /* transmit data */
                bus_space_write_multi_1(sc->sc_io_tag, sc->sc_io_hdl,
                    USS820_TXDAT * USS820_REG_STRIDE, buf_res.buffer, buf_res.length);

                /* update counters */
                count -= buf_res.length;
                td->offset += buf_res.length;
                td->remainder -= buf_res.length;
        }

        /* post-write high packet byte count first */
        USS820_WRITE_1(sc, USS820_TXCNTH, count_copy >> 8);

        /* post-write low packet byte count last */
        USS820_WRITE_1(sc, USS820_TXCNTL, count_copy);

        /*
         * Enable TX output, which must happen after that we have written
         * data into the FIFO. This is undocumented.
         */
        if (!td->did_enable) {
                uss820dci_update_shared_1(USS820_DCI_PC2SC(td->pc),
                    USS820_EPCON, 0xFF, USS820_EPCON_TXOE);
                td->did_enable = 1;
        }
        /* check remainder */
        if (td->remainder == 0) {
                if (td->short_pkt) {
                        return (0);     /* complete */
                }
                /* else we need to transmit a short packet */
        }
        if (--to) {
                goto repeat;
        }
        return (1);                     /* not complete */
}

static uint8_t
uss820dci_data_tx_sync(struct uss820dci_softc *sc, struct uss820dci_td *td)
{
        uint8_t rx_stat;
        uint8_t tx_flag;

        /* select the correct endpoint */
        USS820_WRITE_1(sc, USS820_EPINDEX, td->ep_index);

        /* read out TX FIFO flag */
        tx_flag = USS820_READ_1(sc, USS820_TXFLG);

        if (td->ep_index == 0) {
                /* read out RX FIFO status last */
                rx_stat = USS820_READ_1(sc, USS820_RXSTAT);

                DPRINTFN(5, "rx_stat=0x%02x rem=%u\n", rx_stat, td->remainder);

                if (rx_stat & (USS820_RXSTAT_RXSETUP |
                    USS820_RXSTAT_RXSOVW |
                    USS820_RXSTAT_EDOVW)) {
                        DPRINTFN(5, "faking complete\n");
                        /* Race condition */
                        return (0);             /* complete */
                }
        }
        DPRINTFN(5, "tx_flag=0x%02x rem=%u\n", tx_flag, td->remainder);

        if (tx_flag & (USS820_TXFLG_TXOVF |
            USS820_TXFLG_TXURF)) {
                td->error = 1;
                return (0);             /* complete */
        }
        if (tx_flag & (USS820_TXFLG_TXFIF0 |
            USS820_TXFLG_TXFIF1)) {
                return (1);             /* not complete */
        }
        if (td->ep_index == 0 && sc->sc_dv_addr != 0xFF) {
                /* write function address */
                uss820dci_set_address(sc, sc->sc_dv_addr);
        }
        return (0);                     /* complete */
}

static void
uss820dci_xfer_do_fifo(struct usb_xfer *xfer)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(xfer->xroot->bus);
        struct uss820dci_td *td;

        DPRINTFN(9, "\n");

        td = xfer->td_transfer_cache;
        if (td == NULL)
                return;

        while (1) {
                if ((td->func) (sc, td)) {
                        /* operation in progress */
                        break;
                }
                if (((void *)td) == xfer->td_transfer_last) {
                        goto done;
                }
                if (td->error) {
                        goto done;
                } else if (td->remainder > 0) {
                        /*
                         * We had a short transfer. If there is no alternate
                         * next, stop processing !
                         */
                        if (!td->alt_next) {
                                goto done;
                        }
                }
                /*
                 * Fetch the next transfer descriptor.
                 */
                td = td->obj_next;
                xfer->td_transfer_cache = td;
        }
        return;

done:
        /* compute all actual lengths */
        xfer->td_transfer_cache = NULL;
        sc->sc_xfer_complete = 1;
}

static uint8_t
uss820dci_xfer_do_complete(struct usb_xfer *xfer)
{
        struct uss820dci_td *td;

        DPRINTFN(9, "\n");

        td = xfer->td_transfer_cache;
        if (td == NULL) {
                /* compute all actual lengths */
                uss820dci_standard_done(xfer);
                return(1);
        }
        return (0);
}

static void
uss820dci_interrupt_poll_locked(struct uss820dci_softc *sc)
{
        struct usb_xfer *xfer;

        TAILQ_FOREACH(xfer, &sc->sc_bus.intr_q.head, wait_entry)
                uss820dci_xfer_do_fifo(xfer);
}

static void
uss820dci_interrupt_complete_locked(struct uss820dci_softc *sc)
{
        struct usb_xfer *xfer;
repeat:
        TAILQ_FOREACH(xfer, &sc->sc_bus.intr_q.head, wait_entry) {
                if (uss820dci_xfer_do_complete(xfer))
                        goto repeat;
        }
}

static void
uss820dci_wait_suspend(struct uss820dci_softc *sc, uint8_t on)
{
        uint8_t scr;
        uint8_t scratch;

        scr = USS820_READ_1(sc, USS820_SCR);
        scratch = USS820_READ_1(sc, USS820_SCRATCH);

        if (on) {
                scr |= USS820_SCR_IE_SUSP;
                scratch &= ~USS820_SCRATCH_IE_RESUME;
        } else {
                scr &= ~USS820_SCR_IE_SUSP;
                scratch |= USS820_SCRATCH_IE_RESUME;
        }

        USS820_WRITE_1(sc, USS820_SCR, scr);
        USS820_WRITE_1(sc, USS820_SCRATCH, scratch);
}

int
uss820dci_filter_interrupt(void *arg)
{
        struct uss820dci_softc *sc = arg;
        int retval = FILTER_HANDLED;
        uint8_t ssr;

        USB_BUS_SPIN_LOCK(&sc->sc_bus);

        ssr = USS820_READ_1(sc, USS820_SSR);
        uss820dci_update_shared_1(sc, USS820_SSR, USS820_DCI_THREAD_IRQ, 0);

        if (ssr & USS820_DCI_THREAD_IRQ)
                retval = FILTER_SCHEDULE_THREAD;

        /* poll FIFOs, if any */
        uss820dci_interrupt_poll_locked(sc);

        if (sc->sc_xfer_complete != 0)
                retval = FILTER_SCHEDULE_THREAD;

        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);

        return (retval);
}

void
uss820dci_interrupt(void *arg)
{
        struct uss820dci_softc *sc = arg;
        uint8_t ssr;
        uint8_t event;

        USB_BUS_LOCK(&sc->sc_bus);
        USB_BUS_SPIN_LOCK(&sc->sc_bus);

        ssr = USS820_READ_1(sc, USS820_SSR);

        /* acknowledge all interrupts */

        uss820dci_update_shared_1(sc, USS820_SSR, ~USS820_DCI_THREAD_IRQ, 0);

        /* check for any bus state change interrupts */

        if (ssr & USS820_DCI_THREAD_IRQ) {
                event = 0;

                if (ssr & USS820_SSR_RESET) {
                        sc->sc_flags.status_bus_reset = 1;
                        sc->sc_flags.status_suspend = 0;
                        sc->sc_flags.change_suspend = 0;
                        sc->sc_flags.change_connect = 1;

                        /* disable resume interrupt */
                        uss820dci_wait_suspend(sc, 1);

                        event = 1;
                }
                /*
                 * If "RESUME" and "SUSPEND" is set at the same time
                 * we interpret that like "RESUME". Resume is set when
                 * there is at least 3 milliseconds of inactivity on
                 * the USB BUS.
                 */
                if (ssr & USS820_SSR_RESUME) {
                        if (sc->sc_flags.status_suspend) {
                                sc->sc_flags.status_suspend = 0;
                                sc->sc_flags.change_suspend = 1;
                                /* disable resume interrupt */
                                uss820dci_wait_suspend(sc, 1);
                                event = 1;
                        }
                } else if (ssr & USS820_SSR_SUSPEND) {
                        if (!sc->sc_flags.status_suspend) {
                                sc->sc_flags.status_suspend = 1;
                                sc->sc_flags.change_suspend = 1;
                                /* enable resume interrupt */
                                uss820dci_wait_suspend(sc, 0);
                                event = 1;
                        }
                }
                if (event) {
                        DPRINTF("real bus interrupt 0x%02x\n", ssr);

                        /* complete root HUB interrupt endpoint */
                        uss820dci_root_intr(sc);
                }
        }
        /* acknowledge all SBI interrupts */
        uss820dci_update_shared_1(sc, USS820_SBI, 0, 0);

        /* acknowledge all SBI1 interrupts */
        uss820dci_update_shared_1(sc, USS820_SBI1, 0, 0);

        if (sc->sc_xfer_complete != 0) {
                sc->sc_xfer_complete = 0;

                /* complete FIFOs, if any */
                uss820dci_interrupt_complete_locked(sc);
        }
        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);
        USB_BUS_UNLOCK(&sc->sc_bus);
}

static void
uss820dci_setup_standard_chain_sub(struct uss820_std_temp *temp)
{
        struct uss820dci_td *td;

        /* get current Transfer Descriptor */
        td = temp->td_next;
        temp->td = td;

        /* prepare for next TD */
        temp->td_next = td->obj_next;

        /* fill out the Transfer Descriptor */
        td->func = temp->func;
        td->pc = temp->pc;
        td->offset = temp->offset;
        td->remainder = temp->len;
        td->error = 0;
        td->did_enable = 0;
        td->did_stall = temp->did_stall;
        td->short_pkt = temp->short_pkt;
        td->alt_next = temp->setup_alt_next;
}

static void
uss820dci_setup_standard_chain(struct usb_xfer *xfer)
{
        struct uss820_std_temp temp;
        struct uss820dci_td *td;
        uint32_t x;

        DPRINTFN(9, "addr=%d endpt=%d sumlen=%d speed=%d\n",
            xfer->address, UE_GET_ADDR(xfer->endpointno),
            xfer->sumlen, usbd_get_speed(xfer->xroot->udev));

        temp.max_frame_size = xfer->max_frame_size;

        td = xfer->td_start[0];
        xfer->td_transfer_first = td;
        xfer->td_transfer_cache = td;

        /* setup temp */

        temp.pc = NULL;
        temp.td = NULL;
        temp.td_next = xfer->td_start[0];
        temp.offset = 0;
        temp.setup_alt_next = xfer->flags_int.short_frames_ok ||
            xfer->flags_int.isochronous_xfr;
        temp.did_stall = !xfer->flags_int.control_stall;

        /* check if we should prepend a setup message */

        if (xfer->flags_int.control_xfr) {
                if (xfer->flags_int.control_hdr) {
                        temp.func = &uss820dci_setup_rx;
                        temp.len = xfer->frlengths[0];
                        temp.pc = xfer->frbuffers + 0;
                        temp.short_pkt = temp.len ? 1 : 0;
                        /* check for last frame */
                        if (xfer->nframes == 1) {
                                /* no STATUS stage yet, SETUP is last */
                                if (xfer->flags_int.control_act)
                                        temp.setup_alt_next = 0;
                        }

                        uss820dci_setup_standard_chain_sub(&temp);
                }
                x = 1;
        } else {
                x = 0;
        }

        if (x != xfer->nframes) {
                if (xfer->endpointno & UE_DIR_IN) {
                        temp.func = &uss820dci_data_tx;
                } else {
                        temp.func = &uss820dci_data_rx;
                }

                /* setup "pc" pointer */
                temp.pc = xfer->frbuffers + x;
        }
        while (x != xfer->nframes) {
                /* DATA0 / DATA1 message */

                temp.len = xfer->frlengths[x];

                x++;

                if (x == xfer->nframes) {
                        if (xfer->flags_int.control_xfr) {
                                if (xfer->flags_int.control_act) {
                                        temp.setup_alt_next = 0;
                                }
                        } else {
                                temp.setup_alt_next = 0;
                        }
                }
                if (temp.len == 0) {
                        /* make sure that we send an USB packet */

                        temp.short_pkt = 0;

                } else {
                        /* regular data transfer */

                        temp.short_pkt = (xfer->flags.force_short_xfer) ? 0 : 1;
                }

                uss820dci_setup_standard_chain_sub(&temp);

                if (xfer->flags_int.isochronous_xfr) {
                        temp.offset += temp.len;
                } else {
                        /* get next Page Cache pointer */
                        temp.pc = xfer->frbuffers + x;
                }
        }

        /* check for control transfer */
        if (xfer->flags_int.control_xfr) {
                uint8_t need_sync;

                /* always setup a valid "pc" pointer for status and sync */
                temp.pc = xfer->frbuffers + 0;
                temp.len = 0;
                temp.short_pkt = 0;
                temp.setup_alt_next = 0;

                /* check if we should append a status stage */
                if (!xfer->flags_int.control_act) {
                        /*
                         * Send a DATA1 message and invert the current
                         * endpoint direction.
                         */
                        if (xfer->endpointno & UE_DIR_IN) {
                                temp.func = &uss820dci_data_rx;
                                need_sync = 0;
                        } else {
                                temp.func = &uss820dci_data_tx;
                                need_sync = 1;
                        }
                        temp.len = 0;
                        temp.short_pkt = 0;

                        uss820dci_setup_standard_chain_sub(&temp);
                        if (need_sync) {
                                /* we need a SYNC point after TX */
                                temp.func = &uss820dci_data_tx_sync;
                                uss820dci_setup_standard_chain_sub(&temp);
                        }
                }
        }
        /* must have at least one frame! */
        td = temp.td;
        xfer->td_transfer_last = td;
}

static void
uss820dci_timeout(void *arg)
{
        struct usb_xfer *xfer = arg;

        DPRINTF("xfer=%p\n", xfer);

        USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);

        /* transfer is transferred */
        uss820dci_device_done(xfer, USB_ERR_TIMEOUT);
}

static void
uss820dci_intr_set(struct usb_xfer *xfer, uint8_t set)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(xfer->xroot->bus);
        uint8_t ep_no = (xfer->endpointno & UE_ADDR);
        uint8_t ep_reg;
        uint8_t temp;

        DPRINTFN(15, "endpoint 0x%02x\n", xfer->endpointno);

        if (ep_no > 3) {
                ep_reg = USS820_SBIE1;
        } else {
                ep_reg = USS820_SBIE;
        }

        ep_no &= 3;
        ep_no = 1 << (2 * ep_no);

        if (xfer->flags_int.control_xfr) {
                if (xfer->flags_int.control_hdr) {
                        ep_no <<= 1;    /* RX interrupt only */
                } else {
                        ep_no |= (ep_no << 1);  /* RX and TX interrupt */
                }
        } else {
                if (!(xfer->endpointno & UE_DIR_IN)) {
                        ep_no <<= 1;
                }
        }
        temp = USS820_READ_1(sc, ep_reg);
        if (set) {
                temp |= ep_no;
        } else {
                temp &= ~ep_no;
        }
        USS820_WRITE_1(sc, ep_reg, temp);
}

static void
uss820dci_start_standard_chain(struct usb_xfer *xfer)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(xfer->xroot->bus);

        DPRINTFN(9, "\n");

        USB_BUS_SPIN_LOCK(&sc->sc_bus);

        /* poll one time */
        uss820dci_xfer_do_fifo(xfer);

        if (uss820dci_xfer_do_complete(xfer) == 0) {
                /*
                 * Only enable the endpoint interrupt when we are
                 * actually waiting for data, hence we are dealing
                 * with level triggered interrupts !
                 */
                uss820dci_intr_set(xfer, 1);

                /* put transfer on interrupt queue */
                usbd_transfer_enqueue(&xfer->xroot->bus->intr_q, xfer);

                /* start timeout, if any */
                if (xfer->timeout != 0) {
                        usbd_transfer_timeout_ms(xfer,
                            &uss820dci_timeout, xfer->timeout);
                }
        }
        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);
}

static void
uss820dci_root_intr(struct uss820dci_softc *sc)
{
        DPRINTFN(9, "\n");

        USB_BUS_LOCK_ASSERT(&sc->sc_bus, MA_OWNED);

        /* set port bit */
        sc->sc_hub_idata[0] = 0x02;     /* we only have one port */

        uhub_root_intr(&sc->sc_bus, sc->sc_hub_idata,
            sizeof(sc->sc_hub_idata));
}

static usb_error_t
uss820dci_standard_done_sub(struct usb_xfer *xfer)
{
        struct uss820dci_td *td;
        uint32_t len;
        uint8_t error;

        DPRINTFN(9, "\n");

        td = xfer->td_transfer_cache;

        do {
                len = td->remainder;

                if (xfer->aframes != xfer->nframes) {
                        /*
                         * Verify the length and subtract
                         * the remainder from "frlengths[]":
                         */
                        if (len > xfer->frlengths[xfer->aframes]) {
                                td->error = 1;
                        } else {
                                xfer->frlengths[xfer->aframes] -= len;
                        }
                }
                /* Check for transfer error */
                if (td->error) {
                        /* the transfer is finished */
                        error = 1;
                        td = NULL;
                        break;
                }
                /* Check for short transfer */
                if (len > 0) {
                        if (xfer->flags_int.short_frames_ok ||
                            xfer->flags_int.isochronous_xfr) {
                                /* follow alt next */
                                if (td->alt_next) {
                                        td = td->obj_next;
                                } else {
                                        td = NULL;
                                }
                        } else {
                                /* the transfer is finished */
                                td = NULL;
                        }
                        error = 0;
                        break;
                }
                td = td->obj_next;

                /* this USB frame is complete */
                error = 0;
                break;

        } while (0);

        /* update transfer cache */

        xfer->td_transfer_cache = td;

        return (error ?
            USB_ERR_STALLED : USB_ERR_NORMAL_COMPLETION);
}

static void
uss820dci_standard_done(struct usb_xfer *xfer)
{
        usb_error_t err = 0;

        DPRINTFN(13, "xfer=%p endpoint=%p transfer done\n",
            xfer, xfer->endpoint);

        /* reset scanner */

        xfer->td_transfer_cache = xfer->td_transfer_first;

        if (xfer->flags_int.control_xfr) {
                if (xfer->flags_int.control_hdr) {
                        err = uss820dci_standard_done_sub(xfer);
                }
                xfer->aframes = 1;

                if (xfer->td_transfer_cache == NULL) {
                        goto done;
                }
        }
        while (xfer->aframes != xfer->nframes) {
                err = uss820dci_standard_done_sub(xfer);
                xfer->aframes++;

                if (xfer->td_transfer_cache == NULL) {
                        goto done;
                }
        }

        if (xfer->flags_int.control_xfr &&
            !xfer->flags_int.control_act) {
                err = uss820dci_standard_done_sub(xfer);
        }
done:
        uss820dci_device_done(xfer, err);
}

/*------------------------------------------------------------------------*
 *      uss820dci_device_done
 *
 * NOTE: this function can be called more than one time on the
 * same USB transfer!
 *------------------------------------------------------------------------*/
static void
uss820dci_device_done(struct usb_xfer *xfer, usb_error_t error)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(xfer->xroot->bus);

        USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);

        DPRINTFN(2, "xfer=%p, endpoint=%p, error=%d\n",
            xfer, xfer->endpoint, error);

        USB_BUS_SPIN_LOCK(&sc->sc_bus);

        if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
                uss820dci_intr_set(xfer, 0);
        }
        /* dequeue transfer and start next transfer */
        usbd_transfer_done(xfer, error);

        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);
}

static void
uss820dci_xfer_stall(struct usb_xfer *xfer)
{
        uss820dci_device_done(xfer, USB_ERR_STALLED);
}

static void
uss820dci_set_stall(struct usb_device *udev,
    struct usb_endpoint *ep, uint8_t *did_stall)
{
        struct uss820dci_softc *sc;
        uint8_t ep_no;
        uint8_t ep_type;
        uint8_t ep_dir;
        uint8_t temp;

        USB_BUS_LOCK_ASSERT(udev->bus, MA_OWNED);

        DPRINTFN(5, "endpoint=%p\n", ep);

        /* set FORCESTALL */
        sc = USS820_DCI_BUS2SC(udev->bus);
        ep_no = (ep->edesc->bEndpointAddress & UE_ADDR);
        ep_dir = (ep->edesc->bEndpointAddress & (UE_DIR_IN | UE_DIR_OUT));
        ep_type = (ep->edesc->bmAttributes & UE_XFERTYPE);

        if (ep_type == UE_CONTROL) {
                /* should not happen */
                return;
        }
        USB_BUS_SPIN_LOCK(&sc->sc_bus);
        USS820_WRITE_1(sc, USS820_EPINDEX, ep_no);

        if (ep_dir == UE_DIR_IN) {
                temp = USS820_EPCON_TXSTL;
        } else {
                temp = USS820_EPCON_RXSTL;
        }
        uss820dci_update_shared_1(sc, USS820_EPCON, 0xFF, temp);
        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);
}

static void
uss820dci_clear_stall_sub(struct uss820dci_softc *sc,
    uint8_t ep_no, uint8_t ep_type, uint8_t ep_dir)
{
        uint8_t temp;

        if (ep_type == UE_CONTROL) {
                /* clearing stall is not needed */
                return;
        }
        USB_BUS_SPIN_LOCK(&sc->sc_bus);

        /* select endpoint index */
        USS820_WRITE_1(sc, USS820_EPINDEX, ep_no);

        /* clear stall and disable I/O transfers */
        if (ep_dir == UE_DIR_IN) {
                temp = 0xFF ^ (USS820_EPCON_TXOE |
                    USS820_EPCON_TXSTL);
        } else {
                temp = 0xFF ^ (USS820_EPCON_RXIE |
                    USS820_EPCON_RXSTL);
        }
        uss820dci_update_shared_1(sc, USS820_EPCON, temp, 0);

        if (ep_dir == UE_DIR_IN) {
                /* reset data toggle */
                USS820_WRITE_1(sc, USS820_TXSTAT,
                    USS820_TXSTAT_TXSOVW);

                /* reset FIFO */
                temp = USS820_READ_1(sc, USS820_TXCON);
                temp |= USS820_TXCON_TXCLR;
                USS820_WRITE_1(sc, USS820_TXCON, temp);
                temp &= ~USS820_TXCON_TXCLR;
                USS820_WRITE_1(sc, USS820_TXCON, temp);
        } else {
                /* reset data toggle */
                uss820dci_update_shared_1(sc, USS820_RXSTAT,
                    0, USS820_RXSTAT_RXSOVW);

                /* reset FIFO */
                temp = USS820_READ_1(sc, USS820_RXCON);
                temp |= USS820_RXCON_RXCLR;
                temp &= ~USS820_RXCON_RXFFRC;
                USS820_WRITE_1(sc, USS820_RXCON, temp);
                temp &= ~USS820_RXCON_RXCLR;
                USS820_WRITE_1(sc, USS820_RXCON, temp);
        }
        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);
}

static void
uss820dci_clear_stall(struct usb_device *udev, struct usb_endpoint *ep)
{
        struct uss820dci_softc *sc;
        struct usb_endpoint_descriptor *ed;

        USB_BUS_LOCK_ASSERT(udev->bus, MA_OWNED);

        DPRINTFN(5, "endpoint=%p\n", ep);

        /* check mode */
        if (udev->flags.usb_mode != USB_MODE_DEVICE) {
                /* not supported */
                return;
        }
        /* get softc */
        sc = USS820_DCI_BUS2SC(udev->bus);

        /* get endpoint descriptor */
        ed = ep->edesc;

        /* reset endpoint */
        uss820dci_clear_stall_sub(sc,
            (ed->bEndpointAddress & UE_ADDR),
            (ed->bmAttributes & UE_XFERTYPE),
            (ed->bEndpointAddress & (UE_DIR_IN | UE_DIR_OUT)));
}

usb_error_t
uss820dci_init(struct uss820dci_softc *sc)
{
        const struct usb_hw_ep_profile *pf;
        uint8_t n;
        uint8_t temp;

        DPRINTF("start\n");

        /* set up the bus structure */
        sc->sc_bus.usbrev = USB_REV_1_1;
        sc->sc_bus.methods = &uss820dci_bus_methods;

        USB_BUS_LOCK(&sc->sc_bus);

        /* we always have VBUS */
        sc->sc_flags.status_vbus = 1;

        /* reset the chip */
        USS820_WRITE_1(sc, USS820_SCR, USS820_SCR_SRESET);
        DELAY(100);
        USS820_WRITE_1(sc, USS820_SCR, 0);

        /* wait for reset to complete */
        for (n = 0;; n++) {
                temp = USS820_READ_1(sc, USS820_MCSR);

                if (temp & USS820_MCSR_INIT) {
                        break;
                }
                if (n == 100) {
                        USB_BUS_UNLOCK(&sc->sc_bus);
                        return (USB_ERR_INVAL);
                }
                /* wait a little for things to stabilise */
                DELAY(100);
        }

        /* do a pulldown */
        uss820dci_pull_down(sc);

        /* wait 10ms for pulldown to stabilise */
        usb_pause_mtx(&sc->sc_bus.bus_mtx, hz / 100);

        /* check hardware revision */
        temp = USS820_READ_1(sc, USS820_REV);

        if (temp < 0x13) {
                USB_BUS_UNLOCK(&sc->sc_bus);
                return (USB_ERR_INVAL);
        }
        /* enable interrupts */
        USS820_WRITE_1(sc, USS820_SCR,
            USS820_SCR_T_IRQ |
            USS820_SCR_IE_RESET |
        /* USS820_SCR_RWUPE | */
            USS820_SCR_IE_SUSP |
            USS820_SCR_IRQPOL);

        /* enable interrupts */
        USS820_WRITE_1(sc, USS820_SCRATCH,
            USS820_SCRATCH_IE_RESUME);

        /* enable features */
        USS820_WRITE_1(sc, USS820_MCSR,
            USS820_MCSR_BDFEAT |
            USS820_MCSR_FEAT);

        sc->sc_flags.mcsr_feat = 1;

        /* disable interrupts */
        USS820_WRITE_1(sc, USS820_SBIE, 0);

        /* disable interrupts */
        USS820_WRITE_1(sc, USS820_SBIE1, 0);

        /* disable all endpoints */
        for (n = 0; n != USS820_EP_MAX; n++) {
                /* select endpoint */
                USS820_WRITE_1(sc, USS820_EPINDEX, n);

                /* disable endpoint */
                uss820dci_update_shared_1(sc, USS820_EPCON, 0, 0);
        }

        /*
         * Initialise default values for some registers that cannot be
         * changed during operation!
         */
        for (n = 0; n != USS820_EP_MAX; n++) {
                uss820dci_get_hw_ep_profile(NULL, &pf, n);

                /* the maximum frame sizes should be the same */
                if (pf->max_in_frame_size != pf->max_out_frame_size) {
                        DPRINTF("Max frame size mismatch %u != %u\n",
                            pf->max_in_frame_size, pf->max_out_frame_size);
                }
                if (pf->support_isochronous) {
                        if (pf->max_in_frame_size <= 64) {
                                temp = (USS820_TXCON_FFSZ_16_64 |
                                    USS820_TXCON_TXISO |
                                    USS820_TXCON_ATM);
                        } else if (pf->max_in_frame_size <= 256) {
                                temp = (USS820_TXCON_FFSZ_64_256 |
                                    USS820_TXCON_TXISO |
                                    USS820_TXCON_ATM);
                        } else if (pf->max_in_frame_size <= 512) {
                                temp = (USS820_TXCON_FFSZ_8_512 |
                                    USS820_TXCON_TXISO |
                                    USS820_TXCON_ATM);
                        } else {        /* 1024 bytes */
                                temp = (USS820_TXCON_FFSZ_32_1024 |
                                    USS820_TXCON_TXISO |
                                    USS820_TXCON_ATM);
                        }
                } else {
                        if ((pf->max_in_frame_size <= 8) &&
                            (sc->sc_flags.mcsr_feat)) {
                                temp = (USS820_TXCON_FFSZ_8_512 |
                                    USS820_TXCON_ATM);
                        } else if (pf->max_in_frame_size <= 16) {
                                temp = (USS820_TXCON_FFSZ_16_64 |
                                    USS820_TXCON_ATM);
                        } else if ((pf->max_in_frame_size <= 32) &&
                            (sc->sc_flags.mcsr_feat)) {
                                temp = (USS820_TXCON_FFSZ_32_1024 |
                                    USS820_TXCON_ATM);
                        } else {        /* 64 bytes */
                                temp = (USS820_TXCON_FFSZ_64_256 |
                                    USS820_TXCON_ATM);
                        }
                }

                /* need to configure the chip early */

                USS820_WRITE_1(sc, USS820_EPINDEX, n);
                USS820_WRITE_1(sc, USS820_TXCON, temp);
                USS820_WRITE_1(sc, USS820_RXCON, temp);

                if (pf->support_control) {
                        temp = USS820_EPCON_CTLEP |
                            USS820_EPCON_RXSPM |
                            USS820_EPCON_RXIE |
                            USS820_EPCON_RXEPEN |
                            USS820_EPCON_TXOE |
                            USS820_EPCON_TXEPEN;
                } else {
                        temp = USS820_EPCON_RXEPEN | USS820_EPCON_TXEPEN;
                }

                uss820dci_update_shared_1(sc, USS820_EPCON, 0, temp);
        }

        USB_BUS_UNLOCK(&sc->sc_bus);

        /* catch any lost interrupts */

        uss820dci_do_poll(&sc->sc_bus);

        return (0);                     /* success */
}

void
uss820dci_uninit(struct uss820dci_softc *sc)
{
        uint8_t temp;

        USB_BUS_LOCK(&sc->sc_bus);

        /* disable all interrupts */
        temp = USS820_READ_1(sc, USS820_SCR);
        temp &= ~USS820_SCR_T_IRQ;
        USS820_WRITE_1(sc, USS820_SCR, temp);

        sc->sc_flags.port_powered = 0;
        sc->sc_flags.status_vbus = 0;
        sc->sc_flags.status_bus_reset = 0;
        sc->sc_flags.status_suspend = 0;
        sc->sc_flags.change_suspend = 0;
        sc->sc_flags.change_connect = 1;

        uss820dci_pull_down(sc);
        USB_BUS_UNLOCK(&sc->sc_bus);
}

static void
uss820dci_suspend(struct uss820dci_softc *sc)
{
        /* TODO */
}

static void
uss820dci_resume(struct uss820dci_softc *sc)
{
        /* TODO */
}

static void
uss820dci_do_poll(struct usb_bus *bus)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(bus);

        USB_BUS_LOCK(&sc->sc_bus);
        USB_BUS_SPIN_LOCK(&sc->sc_bus);
        uss820dci_interrupt_poll_locked(sc);
        uss820dci_interrupt_complete_locked(sc);
        USB_BUS_SPIN_UNLOCK(&sc->sc_bus);
        USB_BUS_UNLOCK(&sc->sc_bus);
}

/*------------------------------------------------------------------------*
 * uss820dci bulk support
 *------------------------------------------------------------------------*/
static void
uss820dci_device_bulk_open(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_bulk_close(struct usb_xfer *xfer)
{
        uss820dci_device_done(xfer, USB_ERR_CANCELLED);
}

static void
uss820dci_device_bulk_enter(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_bulk_start(struct usb_xfer *xfer)
{
        /* setup TDs */
        uss820dci_setup_standard_chain(xfer);
        uss820dci_start_standard_chain(xfer);
}

static const struct usb_pipe_methods uss820dci_device_bulk_methods =
{
        .open = uss820dci_device_bulk_open,
        .close = uss820dci_device_bulk_close,
        .enter = uss820dci_device_bulk_enter,
        .start = uss820dci_device_bulk_start,
};

/*------------------------------------------------------------------------*
 * uss820dci control support
 *------------------------------------------------------------------------*/
static void
uss820dci_device_ctrl_open(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_ctrl_close(struct usb_xfer *xfer)
{
        uss820dci_device_done(xfer, USB_ERR_CANCELLED);
}

static void
uss820dci_device_ctrl_enter(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_ctrl_start(struct usb_xfer *xfer)
{
        /* setup TDs */
        uss820dci_setup_standard_chain(xfer);
        uss820dci_start_standard_chain(xfer);
}

static const struct usb_pipe_methods uss820dci_device_ctrl_methods =
{
        .open = uss820dci_device_ctrl_open,
        .close = uss820dci_device_ctrl_close,
        .enter = uss820dci_device_ctrl_enter,
        .start = uss820dci_device_ctrl_start,
};

/*------------------------------------------------------------------------*
 * uss820dci interrupt support
 *------------------------------------------------------------------------*/
static void
uss820dci_device_intr_open(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_intr_close(struct usb_xfer *xfer)
{
        uss820dci_device_done(xfer, USB_ERR_CANCELLED);
}

static void
uss820dci_device_intr_enter(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_intr_start(struct usb_xfer *xfer)
{
        /* setup TDs */
        uss820dci_setup_standard_chain(xfer);
        uss820dci_start_standard_chain(xfer);
}

static const struct usb_pipe_methods uss820dci_device_intr_methods =
{
        .open = uss820dci_device_intr_open,
        .close = uss820dci_device_intr_close,
        .enter = uss820dci_device_intr_enter,
        .start = uss820dci_device_intr_start,
};

/*------------------------------------------------------------------------*
 * uss820dci full speed isochronous support
 *------------------------------------------------------------------------*/
static void
uss820dci_device_isoc_fs_open(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_device_isoc_fs_close(struct usb_xfer *xfer)
{
        uss820dci_device_done(xfer, USB_ERR_CANCELLED);
}

static void
uss820dci_device_isoc_fs_enter(struct usb_xfer *xfer)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(xfer->xroot->bus);
        uint32_t nframes;

        DPRINTFN(6, "xfer=%p next=%d nframes=%d\n",
            xfer, xfer->endpoint->isoc_next, xfer->nframes);

        /* get the current frame index - we don't need the high bits */

        nframes = USS820_READ_1(sc, USS820_SOFL);

        if (usbd_xfer_get_isochronous_start_frame(
            xfer, nframes, 0, 1, USS820_SOFL_MASK, NULL))
                DPRINTFN(3, "start next=%d\n", xfer->endpoint->isoc_next);

        /* setup TDs */
        uss820dci_setup_standard_chain(xfer);
}

static void
uss820dci_device_isoc_fs_start(struct usb_xfer *xfer)
{
        /* start TD chain */
        uss820dci_start_standard_chain(xfer);
}

static const struct usb_pipe_methods uss820dci_device_isoc_fs_methods =
{
        .open = uss820dci_device_isoc_fs_open,
        .close = uss820dci_device_isoc_fs_close,
        .enter = uss820dci_device_isoc_fs_enter,
        .start = uss820dci_device_isoc_fs_start,
};

/*------------------------------------------------------------------------*
 * uss820dci root control support
 *------------------------------------------------------------------------*
 * Simulate a hardware HUB by handling all the necessary requests.
 *------------------------------------------------------------------------*/

static const struct usb_device_descriptor uss820dci_devd = {
        .bLength = sizeof(struct usb_device_descriptor),
        .bDescriptorType = UDESC_DEVICE,
        .bcdUSB = {0x00, 0x02},
        .bDeviceClass = UDCLASS_HUB,
        .bDeviceSubClass = UDSUBCLASS_HUB,
        .bDeviceProtocol = UDPROTO_FSHUB,
        .bMaxPacketSize = 64,
        .bcdDevice = {0x00, 0x01},
        .iManufacturer = 1,
        .iProduct = 2,
        .bNumConfigurations = 1,
};

static const struct usb_device_qualifier uss820dci_odevd = {
        .bLength = sizeof(struct usb_device_qualifier),
        .bDescriptorType = UDESC_DEVICE_QUALIFIER,
        .bcdUSB = {0x00, 0x02},
        .bDeviceClass = UDCLASS_HUB,
        .bDeviceSubClass = UDSUBCLASS_HUB,
        .bDeviceProtocol = UDPROTO_FSHUB,
        .bMaxPacketSize0 = 0,
        .bNumConfigurations = 0,
};

static const struct uss820dci_config_desc uss820dci_confd = {
        .confd = {
                .bLength = sizeof(struct usb_config_descriptor),
                .bDescriptorType = UDESC_CONFIG,
                .wTotalLength[0] = sizeof(uss820dci_confd),
                .bNumInterface = 1,
                .bConfigurationValue = 1,
                .iConfiguration = 0,
                .bmAttributes = UC_SELF_POWERED,
                .bMaxPower = 0,
        },
        .ifcd = {
                .bLength = sizeof(struct usb_interface_descriptor),
                .bDescriptorType = UDESC_INTERFACE,
                .bNumEndpoints = 1,
                .bInterfaceClass = UICLASS_HUB,
                .bInterfaceSubClass = UISUBCLASS_HUB,
                .bInterfaceProtocol = 0,
        },

        .endpd = {
                .bLength = sizeof(struct usb_endpoint_descriptor),
                .bDescriptorType = UDESC_ENDPOINT,
                .bEndpointAddress = (UE_DIR_IN | USS820_DCI_INTR_ENDPT),
                .bmAttributes = UE_INTERRUPT,
                .wMaxPacketSize[0] = 8,
                .bInterval = 255,
        },
};
#define HSETW(ptr, val) ptr = { (uint8_t)(val), (uint8_t)((val) >> 8) }

static const struct usb_hub_descriptor_min uss820dci_hubd = {
        .bDescLength = sizeof(uss820dci_hubd),
        .bDescriptorType = UDESC_HUB,
        .bNbrPorts = 1,
        HSETW(.wHubCharacteristics, (UHD_PWR_NO_SWITCH | UHD_OC_INDIVIDUAL)),
        .bPwrOn2PwrGood = 50,
        .bHubContrCurrent = 0,
        .DeviceRemovable = {0},         /* port is removable */
};

#define STRING_VENDOR \
  "A\0G\0E\0R\0E"

#define STRING_PRODUCT \
  "D\0C\0I\0 \0R\0o\0o\0t\0 \0H\0U\0B"

USB_MAKE_STRING_DESC(STRING_VENDOR, uss820dci_vendor);
USB_MAKE_STRING_DESC(STRING_PRODUCT, uss820dci_product);

static usb_error_t
uss820dci_roothub_exec(struct usb_device *udev,
    struct usb_device_request *req, const void **pptr, uint16_t *plength)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(udev->bus);
        const void *ptr;
        uint16_t len;
        uint16_t value;
        uint16_t index;
        usb_error_t err;

        USB_BUS_LOCK_ASSERT(&sc->sc_bus, MA_OWNED);

        /* buffer reset */
        ptr = (const void *)&sc->sc_hub_temp;
        len = 0;
        err = 0;

        value = UGETW(req->wValue);
        index = UGETW(req->wIndex);

        /* demultiplex the control request */

        switch (req->bmRequestType) {
        case UT_READ_DEVICE:
                switch (req->bRequest) {
                case UR_GET_DESCRIPTOR:
                        goto tr_handle_get_descriptor;
                case UR_GET_CONFIG:
                        goto tr_handle_get_config;
                case UR_GET_STATUS:
                        goto tr_handle_get_status;
                default:
                        goto tr_stalled;
                }
                break;

        case UT_WRITE_DEVICE:
                switch (req->bRequest) {
                case UR_SET_ADDRESS:
                        goto tr_handle_set_address;
                case UR_SET_CONFIG:
                        goto tr_handle_set_config;
                case UR_CLEAR_FEATURE:
                        goto tr_valid;  /* nop */
                case UR_SET_DESCRIPTOR:
                        goto tr_valid;  /* nop */
                case UR_SET_FEATURE:
                default:
                        goto tr_stalled;
                }
                break;

        case UT_WRITE_ENDPOINT:
                switch (req->bRequest) {
                case UR_CLEAR_FEATURE:
                        switch (UGETW(req->wValue)) {
                        case UF_ENDPOINT_HALT:
                                goto tr_handle_clear_halt;
                        case UF_DEVICE_REMOTE_WAKEUP:
                                goto tr_handle_clear_wakeup;
                        default:
                                goto tr_stalled;
                        }
                        break;
                case UR_SET_FEATURE:
                        switch (UGETW(req->wValue)) {
                        case UF_ENDPOINT_HALT:
                                goto tr_handle_set_halt;
                        case UF_DEVICE_REMOTE_WAKEUP:
                                goto tr_handle_set_wakeup;
                        default:
                                goto tr_stalled;
                        }
                        break;
                case UR_SYNCH_FRAME:
                        goto tr_valid;  /* nop */
                default:
                        goto tr_stalled;
                }
                break;

        case UT_READ_ENDPOINT:
                switch (req->bRequest) {
                case UR_GET_STATUS:
                        goto tr_handle_get_ep_status;
                default:
                        goto tr_stalled;
                }
                break;

        case UT_WRITE_INTERFACE:
                switch (req->bRequest) {
                case UR_SET_INTERFACE:
                        goto tr_handle_set_interface;
                case UR_CLEAR_FEATURE:
                        goto tr_valid;  /* nop */
                case UR_SET_FEATURE:
                default:
                        goto tr_stalled;
                }
                break;

        case UT_READ_INTERFACE:
                switch (req->bRequest) {
                case UR_GET_INTERFACE:
                        goto tr_handle_get_interface;
                case UR_GET_STATUS:
                        goto tr_handle_get_iface_status;
                default:
                        goto tr_stalled;
                }
                break;

        case UT_WRITE_CLASS_INTERFACE:
        case UT_WRITE_VENDOR_INTERFACE:
                /* XXX forward */
                break;

        case UT_READ_CLASS_INTERFACE:
        case UT_READ_VENDOR_INTERFACE:
                /* XXX forward */
                break;

        case UT_WRITE_CLASS_DEVICE:
                switch (req->bRequest) {
                case UR_CLEAR_FEATURE:
                        goto tr_valid;
                case UR_SET_DESCRIPTOR:
                case UR_SET_FEATURE:
                        break;
                default:
                        goto tr_stalled;
                }
                break;

        case UT_WRITE_CLASS_OTHER:
                switch (req->bRequest) {
                case UR_CLEAR_FEATURE:
                        goto tr_handle_clear_port_feature;
                case UR_SET_FEATURE:
                        goto tr_handle_set_port_feature;
                case UR_CLEAR_TT_BUFFER:
                case UR_RESET_TT:
                case UR_STOP_TT:
                        goto tr_valid;

                default:
                        goto tr_stalled;
                }
                break;

        case UT_READ_CLASS_OTHER:
                switch (req->bRequest) {
                case UR_GET_TT_STATE:
                        goto tr_handle_get_tt_state;
                case UR_GET_STATUS:
                        goto tr_handle_get_port_status;
                default:
                        goto tr_stalled;
                }
                break;

        case UT_READ_CLASS_DEVICE:
                switch (req->bRequest) {
                case UR_GET_DESCRIPTOR:
                        goto tr_handle_get_class_descriptor;
                case UR_GET_STATUS:
                        goto tr_handle_get_class_status;

                default:
                        goto tr_stalled;
                }
                break;
        default:
                goto tr_stalled;
        }
        goto tr_valid;

tr_handle_get_descriptor:
        switch (value >> 8) {
        case UDESC_DEVICE:
                if (value & 0xff) {
                        goto tr_stalled;
                }
                len = sizeof(uss820dci_devd);
                ptr = (const void *)&uss820dci_devd;
                goto tr_valid;
        case UDESC_DEVICE_QUALIFIER:
                if (value & 0xff) {
                        goto tr_stalled;
                }
                len = sizeof(uss820dci_odevd);
                ptr = (const void *)&uss820dci_odevd;
                goto tr_valid;
        case UDESC_CONFIG:
                if (value & 0xff) {
                        goto tr_stalled;
                }
                len = sizeof(uss820dci_confd);
                ptr = (const void *)&uss820dci_confd;
                goto tr_valid;
        case UDESC_STRING:
                switch (value & 0xff) {
                case 0:         /* Language table */
                        len = sizeof(usb_string_lang_en);
                        ptr = (const void *)&usb_string_lang_en;
                        goto tr_valid;

                case 1:         /* Vendor */
                        len = sizeof(uss820dci_vendor);
                        ptr = (const void *)&uss820dci_vendor;
                        goto tr_valid;

                case 2:         /* Product */
                        len = sizeof(uss820dci_product);
                        ptr = (const void *)&uss820dci_product;
                        goto tr_valid;
                default:
                        break;
                }
                break;
        default:
                goto tr_stalled;
        }
        goto tr_stalled;

tr_handle_get_config:
        len = 1;
        sc->sc_hub_temp.wValue[0] = sc->sc_conf;
        goto tr_valid;

tr_handle_get_status:
        len = 2;
        USETW(sc->sc_hub_temp.wValue, UDS_SELF_POWERED);
        goto tr_valid;

tr_handle_set_address:
        if (value & 0xFF00) {
                goto tr_stalled;
        }
        sc->sc_rt_addr = value;
        goto tr_valid;

tr_handle_set_config:
        if (value >= 2) {
                goto tr_stalled;
        }
        sc->sc_conf = value;
        goto tr_valid;

tr_handle_get_interface:
        len = 1;
        sc->sc_hub_temp.wValue[0] = 0;
        goto tr_valid;

tr_handle_get_tt_state:
tr_handle_get_class_status:
tr_handle_get_iface_status:
tr_handle_get_ep_status:
        len = 2;
        USETW(sc->sc_hub_temp.wValue, 0);
        goto tr_valid;

tr_handle_set_halt:
tr_handle_set_interface:
tr_handle_set_wakeup:
tr_handle_clear_wakeup:
tr_handle_clear_halt:
        goto tr_valid;

tr_handle_clear_port_feature:
        if (index != 1) {
                goto tr_stalled;
        }
        DPRINTFN(9, "UR_CLEAR_PORT_FEATURE on port %d\n", index);

        switch (value) {
        case UHF_PORT_SUSPEND:
                uss820dci_wakeup_peer(sc);
                break;

        case UHF_PORT_ENABLE:
                sc->sc_flags.port_enabled = 0;
                break;

        case UHF_PORT_TEST:
        case UHF_PORT_INDICATOR:
        case UHF_C_PORT_ENABLE:
        case UHF_C_PORT_OVER_CURRENT:
        case UHF_C_PORT_RESET:
                /* nops */
                break;
        case UHF_PORT_POWER:
                sc->sc_flags.port_powered = 0;
                uss820dci_pull_down(sc);
                break;
        case UHF_C_PORT_CONNECTION:
                sc->sc_flags.change_connect = 0;
                break;
        case UHF_C_PORT_SUSPEND:
                sc->sc_flags.change_suspend = 0;
                break;
        default:
                err = USB_ERR_IOERROR;
                goto done;
        }
        goto tr_valid;

tr_handle_set_port_feature:
        if (index != 1) {
                goto tr_stalled;
        }
        DPRINTFN(9, "UR_SET_PORT_FEATURE\n");

        switch (value) {
        case UHF_PORT_ENABLE:
                sc->sc_flags.port_enabled = 1;
                break;
        case UHF_PORT_SUSPEND:
        case UHF_PORT_RESET:
        case UHF_PORT_TEST:
        case UHF_PORT_INDICATOR:
                /* nops */
                break;
        case UHF_PORT_POWER:
                sc->sc_flags.port_powered = 1;
                break;
        default:
                err = USB_ERR_IOERROR;
                goto done;
        }
        goto tr_valid;

tr_handle_get_port_status:

        DPRINTFN(9, "UR_GET_PORT_STATUS\n");

        if (index != 1) {
                goto tr_stalled;
        }
        if (sc->sc_flags.status_vbus) {
                uss820dci_pull_up(sc);
        } else {
                uss820dci_pull_down(sc);
        }

        /* Select FULL-speed and Device Side Mode */

        value = UPS_PORT_MODE_DEVICE;

        if (sc->sc_flags.port_powered) {
                value |= UPS_PORT_POWER;
        }
        if (sc->sc_flags.port_enabled) {
                value |= UPS_PORT_ENABLED;
        }
        if (sc->sc_flags.status_vbus &&
            sc->sc_flags.status_bus_reset) {
                value |= UPS_CURRENT_CONNECT_STATUS;
        }
        if (sc->sc_flags.status_suspend) {
                value |= UPS_SUSPEND;
        }
        USETW(sc->sc_hub_temp.ps.wPortStatus, value);

        value = 0;

        if (sc->sc_flags.change_connect) {
                value |= UPS_C_CONNECT_STATUS;
        }
        if (sc->sc_flags.change_suspend) {
                value |= UPS_C_SUSPEND;
        }
        USETW(sc->sc_hub_temp.ps.wPortChange, value);
        len = sizeof(sc->sc_hub_temp.ps);
        goto tr_valid;

tr_handle_get_class_descriptor:
        if (value & 0xFF) {
                goto tr_stalled;
        }
        ptr = (const void *)&uss820dci_hubd;
        len = sizeof(uss820dci_hubd);
        goto tr_valid;

tr_stalled:
        err = USB_ERR_STALLED;
tr_valid:
done:
        *plength = len;
        *pptr = ptr;
        return (err);
}

static void
uss820dci_xfer_setup(struct usb_setup_params *parm)
{
        const struct usb_hw_ep_profile *pf;
        struct usb_xfer *xfer;
        void *last_obj;
        uint32_t ntd;
        uint32_t n;
        uint8_t ep_no;

        xfer = parm->curr_xfer;

        /*
         * NOTE: This driver does not use any of the parameters that
         * are computed from the following values. Just set some
         * reasonable dummies:
         */
        parm->hc_max_packet_size = 0x500;
        parm->hc_max_packet_count = 1;
        parm->hc_max_frame_size = 0x500;

        usbd_transfer_setup_sub(parm);

        /*
         * compute maximum number of TDs
         */
        if (parm->methods == &uss820dci_device_ctrl_methods) {
                ntd = xfer->nframes + 1 /* STATUS */ + 1 /* SYNC */ ;

        } else if (parm->methods == &uss820dci_device_bulk_methods) {
                ntd = xfer->nframes + 1 /* SYNC */ ;

        } else if (parm->methods == &uss820dci_device_intr_methods) {
                ntd = xfer->nframes + 1 /* SYNC */ ;

        } else if (parm->methods == &uss820dci_device_isoc_fs_methods) {
                ntd = xfer->nframes + 1 /* SYNC */ ;

        } else {
                ntd = 0;
        }

        /*
         * check if "usbd_transfer_setup_sub" set an error
         */
        if (parm->err) {
                return;
        }
        /*
         * allocate transfer descriptors
         */
        last_obj = NULL;

        /*
         * get profile stuff
         */
        if (ntd) {
                ep_no = xfer->endpointno & UE_ADDR;
                uss820dci_get_hw_ep_profile(parm->udev, &pf, ep_no);

                if (pf == NULL) {
                        /* should not happen */
                        parm->err = USB_ERR_INVAL;
                        return;
                }
        } else {
                ep_no = 0;
                pf = NULL;
        }

        /* align data */
        parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));

        for (n = 0; n != ntd; n++) {
                struct uss820dci_td *td;

                if (parm->buf) {
                        td = USB_ADD_BYTES(parm->buf, parm->size[0]);

                        /* init TD */
                        td->max_packet_size = xfer->max_packet_size;
                        td->ep_index = ep_no;
                        if (pf->support_multi_buffer &&
                            (parm->methods != &uss820dci_device_ctrl_methods)) {
                                td->support_multi_buffer = 1;
                        }
                        td->obj_next = last_obj;

                        last_obj = td;
                }
                parm->size[0] += sizeof(*td);
        }

        xfer->td_start[0] = last_obj;
}

static void
uss820dci_xfer_unsetup(struct usb_xfer *xfer)
{
        return;
}

static void
uss820dci_ep_init(struct usb_device *udev, struct usb_endpoint_descriptor *edesc,
    struct usb_endpoint *ep)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(udev->bus);

        DPRINTFN(2, "endpoint=%p, addr=%d, endpt=%d, mode=%d (%d)\n",
            ep, udev->address,
            edesc->bEndpointAddress, udev->flags.usb_mode,
            sc->sc_rt_addr);

        if (udev->device_index != sc->sc_rt_addr) {
                if (udev->speed != USB_SPEED_FULL) {
                        /* not supported */
                        return;
                }
                switch (edesc->bmAttributes & UE_XFERTYPE) {
                case UE_CONTROL:
                        ep->methods = &uss820dci_device_ctrl_methods;
                        break;
                case UE_INTERRUPT:
                        ep->methods = &uss820dci_device_intr_methods;
                        break;
                case UE_ISOCHRONOUS:
                        ep->methods = &uss820dci_device_isoc_fs_methods;
                        break;
                case UE_BULK:
                        ep->methods = &uss820dci_device_bulk_methods;
                        break;
                default:
                        /* do nothing */
                        break;
                }
        }
}

static void
uss820dci_set_hw_power_sleep(struct usb_bus *bus, uint32_t state)
{
        struct uss820dci_softc *sc = USS820_DCI_BUS2SC(bus);

        switch (state) {
        case USB_HW_POWER_SUSPEND:
                uss820dci_suspend(sc);
                break;
        case USB_HW_POWER_SHUTDOWN:
                uss820dci_uninit(sc);
                break;
        case USB_HW_POWER_RESUME:
                uss820dci_resume(sc);
                break;
        default:
                break;
        }
}

static const struct usb_bus_methods uss820dci_bus_methods =
{
        .endpoint_init = &uss820dci_ep_init,
        .xfer_setup = &uss820dci_xfer_setup,
        .xfer_unsetup = &uss820dci_xfer_unsetup,
        .get_hw_ep_profile = &uss820dci_get_hw_ep_profile,
        .xfer_stall = &uss820dci_xfer_stall,
        .set_stall = &uss820dci_set_stall,
        .clear_stall = &uss820dci_clear_stall,
        .roothub_exec = &uss820dci_roothub_exec,
        .xfer_poll = &uss820dci_do_poll,
        .set_hw_power_sleep = uss820dci_set_hw_power_sleep,
};