/*      $NetBSD: fwdev.c,v 1.33 2021/11/10 16:08:17 msaitoh Exp $       */
/*-
 * Copyright (c) 2003 Hidetoshi Shimokawa
 * Copyright (c) 1998-2002 Katsushi Kobayashi and Hidetoshi Shimokawa
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the acknowledgement as bellow:
 *
 *    This product includes software developed by K. Kobayashi and H. Shimokawa
 *
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
 *
 * $FreeBSD: src/sys/dev/firewire/fwdev.c,v 1.52 2007/06/06 14:31:36 simokawa Exp $
 *
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fwdev.c,v 1.33 2021/11/10 16:08:17 msaitoh Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/select.h>

#include <dev/ieee1394/firewire.h>
#include <dev/ieee1394/firewirereg.h>
#include <dev/ieee1394/fwdma.h>
#include <dev/ieee1394/fwmem.h>
#include <dev/ieee1394/iec68113.h>

#include "ioconf.h"

#define FWNODE_INVAL 0xffff

dev_type_open(fw_open);
dev_type_close(fw_close);
dev_type_read(fw_read);
dev_type_write(fw_write);
dev_type_ioctl(fw_ioctl);
dev_type_poll(fw_poll);
dev_type_mmap(fw_mmap);
dev_type_strategy(fw_strategy);

const struct bdevsw fw_bdevsw = {
        .d_open = fw_open,
        .d_close = fw_close,
        .d_strategy = fw_strategy,
        .d_ioctl = fw_ioctl,
        .d_dump = nodump,
        .d_psize = nosize,
        .d_discard = nodiscard,
        .d_flag = D_OTHER
};

const struct cdevsw fw_cdevsw = {
        .d_open = fw_open,
        .d_close = fw_close,
        .d_read = fw_read,
        .d_write = fw_write,
        .d_ioctl = fw_ioctl,
        .d_stop = nostop,
        .d_tty = notty,
        .d_poll = fw_poll,
        .d_mmap = fw_mmap,
        .d_kqfilter = nokqfilter,
        .d_discard = nodiscard,
        .d_flag = D_OTHER
};

struct fw_drv1 {
        struct firewire_comm *fc;
        struct fw_xferq *ir;
        struct fw_xferq *it;
        struct fw_isobufreq bufreq;
        STAILQ_HEAD(, fw_bind) binds;
        STAILQ_HEAD(, fw_xfer) rq;
        kcondvar_t cv;
};

static int fwdev_allocbuf(struct firewire_comm *, struct fw_xferq *,
                          struct fw_bufspec *);
static int fwdev_freebuf(struct fw_xferq *);
static int fw_read_async(struct fw_drv1 *, struct uio *, int);
static int fw_write_async(struct fw_drv1 *, struct uio *, int);
static void fw_hand(struct fw_xfer *);


int
fw_open(dev_t dev, int flags, int fmt, struct lwp *td)
{
        struct firewire_softc *sc;
        struct fw_drv1 *d;
        int err = 0;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        if (DEV_FWMEM(dev))
                return fwmem_open(dev, flags, fmt, td);

        mutex_enter(&sc->fc->fc_mtx);
        if (sc->si_drv1 != NULL) {
                mutex_exit(&sc->fc->fc_mtx);
                return EBUSY;
        }
        /* set dummy value for allocation */
        sc->si_drv1 = (void *)-1;
        mutex_exit(&sc->fc->fc_mtx);

        sc->si_drv1 = malloc(sizeof(struct fw_drv1), M_FW, M_WAITOK | M_ZERO);
        if (sc->si_drv1 == NULL)
                return ENOMEM;

        d = (struct fw_drv1 *)sc->si_drv1;
        d->fc = sc->fc;
        STAILQ_INIT(&d->binds);
        STAILQ_INIT(&d->rq);
        cv_init(&d->cv, "fwra");

        return err;
}

int
fw_close(dev_t dev, int flags, int fmt, struct lwp *td)
{
        struct firewire_softc *sc;
        struct firewire_comm *fc;
        struct fw_drv1 *d;
        struct fw_xfer *xfer;
        struct fw_bind *fwb;
        int err = 0;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        if (DEV_FWMEM(dev))
                return fwmem_close(dev, flags, fmt, td);

        d = (struct fw_drv1 *)sc->si_drv1;
        fc = d->fc;

        /* remove binding */
        for (fwb = STAILQ_FIRST(&d->binds); fwb != NULL;
            fwb = STAILQ_FIRST(&d->binds)) {
                fw_bindremove(fc, fwb);
                STAILQ_REMOVE_HEAD(&d->binds, chlist);
                fw_xferlist_remove(&fwb->xferlist);
                free(fwb, M_FW);
        }
        if (d->ir != NULL) {
                struct fw_xferq *ir = d->ir;

                if ((ir->flag & FWXFERQ_OPEN) == 0)
                        return EINVAL;
                if (ir->flag & FWXFERQ_RUNNING) {
                        ir->flag &= ~FWXFERQ_RUNNING;
                        fc->irx_disable(fc, ir->dmach);
                }
                /* free extbuf */
                fwdev_freebuf(ir);
                /* drain receiving buffer */
                for (xfer = STAILQ_FIRST(&ir->q); xfer != NULL;
                    xfer = STAILQ_FIRST(&ir->q)) {
                        ir->queued--;
                        STAILQ_REMOVE_HEAD(&ir->q, link);

                        xfer->resp = 0;
                        fw_xfer_done(xfer);
                }
                ir->flag &=
                    ~(FWXFERQ_OPEN | FWXFERQ_MODEMASK | FWXFERQ_CHTAGMASK);
                d->ir = NULL;

        }
        if (d->it != NULL) {
                struct fw_xferq *it = d->it;

                if ((it->flag & FWXFERQ_OPEN) == 0)
                        return EINVAL;
                if (it->flag & FWXFERQ_RUNNING) {
                        it->flag &= ~FWXFERQ_RUNNING;
                        fc->itx_disable(fc, it->dmach);
                }
                /* free extbuf */
                fwdev_freebuf(it);
                it->flag &=
                    ~(FWXFERQ_OPEN | FWXFERQ_MODEMASK | FWXFERQ_CHTAGMASK);
                d->it = NULL;
        }
        cv_destroy(&d->cv);
        free(sc->si_drv1, M_FW);
        sc->si_drv1 = NULL;

        return err;
}

int
fw_read(dev_t dev, struct uio *uio, int ioflag)
{
        struct firewire_softc *sc;
        struct firewire_comm *fc;
        struct fw_drv1 *d;
        struct fw_xferq *ir;
        struct fw_pkt *fp;
        int err = 0, slept = 0;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        if (DEV_FWMEM(dev))
                return physio(fw_strategy, NULL, dev, ioflag, minphys, uio);

        d = (struct fw_drv1 *)sc->si_drv1;
        fc = d->fc;
        ir = d->ir;

        if (ir == NULL)
                return fw_read_async(d, uio, ioflag);

        if (ir->buf == NULL)
                return EIO;

        mutex_enter(&fc->fc_mtx);
readloop:
        if (ir->stproc == NULL) {
                /* iso bulkxfer */
                ir->stproc = STAILQ_FIRST(&ir->stvalid);
                if (ir->stproc != NULL) {
                        STAILQ_REMOVE_HEAD(&ir->stvalid, link);
                        ir->queued = 0;
                }
        }
        if (ir->stproc == NULL) {
                /* no data available */
                if (slept == 0) {
                        slept = 1;
                        ir->flag |= FWXFERQ_WAKEUP;
                        err = cv_timedwait_sig(&ir->cv, &fc->fc_mtx, hz);
                        ir->flag &= ~FWXFERQ_WAKEUP;
                        if (err == 0)
                                goto readloop;
                } else if (slept == 1)
                        err = EIO;
                mutex_exit(&fc->fc_mtx);
                return err;
        } else if (ir->stproc != NULL) {
                /* iso bulkxfer */
                mutex_exit(&fc->fc_mtx);
                fp = (struct fw_pkt *)fwdma_v_addr(ir->buf,
                    ir->stproc->poffset + ir->queued);
                if (fc->irx_post != NULL)
                        fc->irx_post(fc, fp->mode.ld);
                if (fp->mode.stream.len == 0)
                        return EIO;
                err = uiomove((void *)fp,
                    fp->mode.stream.len + sizeof(uint32_t), uio);
                ir->queued++;
                if (ir->queued >= ir->bnpacket) {
                        STAILQ_INSERT_TAIL(&ir->stfree, ir->stproc, link);
                        fc->irx_enable(fc, ir->dmach);
                        ir->stproc = NULL;
                }
                if (uio->uio_resid >= ir->psize) {
                        slept = -1;
                        mutex_enter(&fc->fc_mtx);
                        goto readloop;
                }
        } else
                mutex_exit(&fc->fc_mtx);
        return err;
}

int
fw_write(dev_t dev, struct uio *uio, int ioflag)
{
        struct firewire_softc *sc;
        struct firewire_comm *fc;
        struct fw_drv1 *d;
        struct fw_pkt *fp;
        struct fw_xferq *it;
        int slept = 0, err = 0;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        if (DEV_FWMEM(dev))
                return physio(fw_strategy, NULL, dev, ioflag, minphys, uio);

        d = (struct fw_drv1 *)sc->si_drv1;
        fc = d->fc;
        it = d->it;

        if (it == NULL)
                return fw_write_async(d, uio, ioflag);

        if (it->buf == NULL)
                return EIO;

        mutex_enter(&fc->fc_mtx);
isoloop:
        if (it->stproc == NULL) {
                it->stproc = STAILQ_FIRST(&it->stfree);
                if (it->stproc != NULL) {
                        STAILQ_REMOVE_HEAD(&it->stfree, link);
                        it->queued = 0;
                } else if (slept == 0) {
                        slept = 1;
#if 0   /* XXX to avoid lock recursion */
                        err = fc->itx_enable(fc, it->dmach);
                        if (err)
                                goto out;
#endif
                        err = cv_timedwait_sig(&it->cv, &fc->fc_mtx, hz);
                        if (err)
                                goto out;
                        goto isoloop;
                } else {
                        err = EIO;
                        goto out;
                }
        }
        mutex_exit(&fc->fc_mtx);
        fp = (struct fw_pkt *)fwdma_v_addr(it->buf,
            it->stproc->poffset + it->queued);
        err = uiomove((void *)fp, sizeof(struct fw_isohdr), uio);
        if (err != 0)
                return err;
        err =
            uiomove((void *)fp->mode.stream.payload, fp->mode.stream.len, uio);
        it->queued++;
        if (it->queued >= it->bnpacket) {
                STAILQ_INSERT_TAIL(&it->stvalid, it->stproc, link);
                it->stproc = NULL;
                err = fc->itx_enable(fc, it->dmach);
        }
        if (uio->uio_resid >= sizeof(struct fw_isohdr)) {
                slept = 0;
                mutex_enter(&fc->fc_mtx);
                goto isoloop;
        }
        return err;

out:
        mutex_exit(&fc->fc_mtx);
        return err;
}

int
fw_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *td)
{
        struct firewire_softc *sc;
        struct firewire_comm *fc;
        struct fw_drv1 *d;
        struct fw_device *fwdev;
        struct fw_bind *fwb;
        struct fw_xferq *ir, *it;
        struct fw_xfer *xfer;
        struct fw_pkt *fp;
        struct fw_devinfo *devinfo;
        struct fw_devlstreq *fwdevlst = (struct fw_devlstreq *)data;
        struct fw_asyreq *asyreq = (struct fw_asyreq *)data;
        struct fw_isochreq *ichreq = (struct fw_isochreq *)data;
        struct fw_isobufreq *ibufreq = (struct fw_isobufreq *)data;
        struct fw_asybindreq *bindreq = (struct fw_asybindreq *)data;
        struct fw_crom_buf *crom_buf = (struct fw_crom_buf *)data;
        int i, len, err = 0;
        void *ptr;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        if (DEV_FWMEM(dev))
                return fwmem_ioctl(dev, cmd, data, flag, td);

        if (!data)
                return EINVAL;

        d = (struct fw_drv1 *)sc->si_drv1;
        fc = d->fc;
        ir = d->ir;
        it = d->it;

        switch (cmd) {
        case FW_STSTREAM:
                if (it == NULL) {
                        i = fw_open_isodma(fc, /* tx */1);
                        if (i < 0) {
                                err = EBUSY;
                                break;
                        }
                        it = fc->it[i];
                        err = fwdev_allocbuf(fc, it, &d->bufreq.tx);
                        if (err) {
                                it->flag &= ~FWXFERQ_OPEN;
                                break;
                        }
                }
                it->flag &= ~0xff;
                it->flag |= (0x3f & ichreq->ch);
                it->flag |= ((0x3 & ichreq->tag) << 6);
                d->it = it;
                break;

        case FW_GTSTREAM:
                if (it != NULL) {
                        ichreq->ch = it->flag & 0x3f;
                        ichreq->tag = it->flag >> 2 & 0x3;
                } else
                        err = EINVAL;
                break;

        case FW_SRSTREAM:
                if (ir == NULL) {
                        i = fw_open_isodma(fc, /* tx */0);
                        if (i < 0) {
                                err = EBUSY;
                                break;
                        }
                        ir = fc->ir[i];
                        err = fwdev_allocbuf(fc, ir, &d->bufreq.rx);
                        if (err) {
                                ir->flag &= ~FWXFERQ_OPEN;
                                break;
                        }
                }
                ir->flag &= ~0xff;
                ir->flag |= (0x3f & ichreq->ch);
                ir->flag |= ((0x3 & ichreq->tag) << 6);
                d->ir = ir;
                err = fc->irx_enable(fc, ir->dmach);
                break;

        case FW_GRSTREAM:
                if (d->ir != NULL) {
                        ichreq->ch = ir->flag & 0x3f;
                        ichreq->tag = ir->flag >> 2 & 0x3;
                } else
                        err = EINVAL;
                break;

        case FW_SSTBUF:
                memcpy(&d->bufreq, ibufreq, sizeof(d->bufreq));
                break;

        case FW_GSTBUF:
                memset(&ibufreq->rx, 0, sizeof(ibufreq->rx));
                if (ir != NULL) {
                        ibufreq->rx.nchunk = ir->bnchunk;
                        ibufreq->rx.npacket = ir->bnpacket;
                        ibufreq->rx.psize = ir->psize;
                }
                memset(&ibufreq->tx, 0, sizeof(ibufreq->tx));
                if (it != NULL) {
                        ibufreq->tx.nchunk = it->bnchunk;
                        ibufreq->tx.npacket = it->bnpacket;
                        ibufreq->tx.psize = it->psize;
                }
                break;

        case FW_ASYREQ:
        {
                const struct tcode_info *tinfo;
                int pay_len = 0;

                fp = &asyreq->pkt;
                tinfo = &fc->tcode[fp->mode.hdr.tcode];

                if ((tinfo->flag & FWTI_BLOCK_ASY) != 0)
                        pay_len = MAX(0, asyreq->req.len - tinfo->hdr_len);

                xfer = fw_xfer_alloc_buf(M_FW, pay_len, PAGE_SIZE/*XXX*/);
                if (xfer == NULL)
                        return ENOMEM;

                switch (asyreq->req.type) {
                case FWASREQNODE:
                        break;

                case FWASREQEUI:
                        fwdev = fw_noderesolve_eui64(fc, &asyreq->req.dst.eui);
                        if (fwdev == NULL) {
                                aprint_error_dev(fc->bdev,
                                    "cannot find node\n");
                                err = EINVAL;
                                goto out;
                        }
                        fp->mode.hdr.dst = FWLOCALBUS | fwdev->dst;
                        break;

                case FWASRESTL:
                        /* XXX what's this? */
                        break;

                case FWASREQSTREAM:
                        /* nothing to do */
                        break;
                }

                memcpy(&xfer->send.hdr, fp, tinfo->hdr_len);
                if (pay_len > 0)
                        memcpy(xfer->send.payload, (char *)fp + tinfo->hdr_len,
                            pay_len);
                xfer->send.spd = asyreq->req.sped;
                xfer->hand = fw_xferwake;

                if ((err = fw_asyreq(fc, -1, xfer)) != 0)
                        goto out;
                if ((err = fw_xferwait(xfer)) != 0)
                        goto out;
                if (xfer->resp != 0) {
                        err = EIO;
                        goto out;
                }
                if ((tinfo->flag & FWTI_TLABEL) == 0)
                        goto out;

                /* copy response */
                tinfo = &fc->tcode[xfer->recv.hdr.mode.hdr.tcode];
                if (xfer->recv.hdr.mode.hdr.tcode == FWTCODE_RRESB ||
                    xfer->recv.hdr.mode.hdr.tcode == FWTCODE_LRES) {
                        pay_len = xfer->recv.pay_len;
                        if (asyreq->req.len >=
                            xfer->recv.pay_len + tinfo->hdr_len)
                                asyreq->req.len =
                                    xfer->recv.pay_len + tinfo->hdr_len;
                        else {
                                err = EINVAL;
                                pay_len = 0;
                        }
                } else
                        pay_len = 0;
                memcpy(fp, &xfer->recv.hdr, tinfo->hdr_len);
                memcpy((char *)fp + tinfo->hdr_len, xfer->recv.payload,
                    pay_len);
out:
                fw_xfer_free_buf(xfer);
                break;
        }

        case FW_IBUSRST:
                fc->ibr(fc);
                break;

        case FW_CBINDADDR:
                fwb = fw_bindlookup(fc, bindreq->start.hi, bindreq->start.lo);
                if (fwb == NULL) {
                        err = EINVAL;
                        break;
                }
                fw_bindremove(fc, fwb);
                STAILQ_REMOVE(&d->binds, fwb, fw_bind, chlist);
                fw_xferlist_remove(&fwb->xferlist);
                free(fwb, M_FW);
                break;

        case FW_SBINDADDR:
                if (bindreq->len <= 0 ) {
                        err = EINVAL;
                        break;
                }
                if (bindreq->start.hi > 0xffff ) {
                        err = EINVAL;
                        break;
                }
                fwb = (struct fw_bind *)malloc(sizeof(struct fw_bind),
                    M_FW, M_WAITOK);
                if (fwb == NULL) {
                        err = ENOMEM;
                        break;
                }
                fwb->start = ((u_int64_t)bindreq->start.hi << 32) |
                    bindreq->start.lo;
                fwb->end = fwb->start +  bindreq->len;
                fwb->sc = (void *)d;
                STAILQ_INIT(&fwb->xferlist);
                err = fw_bindadd(fc, fwb);
                if (err == 0) {
                        fw_xferlist_add(&fwb->xferlist, M_FW,
                            /* XXX */
                            PAGE_SIZE, PAGE_SIZE, 5, fc, (void *)fwb, fw_hand);
                        STAILQ_INSERT_TAIL(&d->binds, fwb, chlist);
                } else {
                        free(fwb, M_FW);
                }
                break;

        case FW_GDEVLST:
                i = len = 1;
                /* myself */
                devinfo = fwdevlst->dev;
                devinfo->dst = fc->nodeid;
                devinfo->status = 0;    /* XXX */
                devinfo->eui.hi = fc->eui.hi;
                devinfo->eui.lo = fc->eui.lo;
                STAILQ_FOREACH(fwdev, &fc->devices, link) {
                        if (len < FW_MAX_DEVLST) {
                                devinfo = &fwdevlst->dev[len++];
                                devinfo->dst = fwdev->dst;
                                devinfo->status =
                                    (fwdev->status == FWDEVINVAL) ? 0 : 1;
                                devinfo->eui.hi = fwdev->eui.hi;
                                devinfo->eui.lo = fwdev->eui.lo;
                        }
                        i++;
                }
                fwdevlst->n = i;
                fwdevlst->info_len = len;
                break;

        case FW_GTPMAP:
                memcpy(data, fc->topology_map,
                    (fc->topology_map->crc_len + 1) * 4);
                break;

        case FW_GCROM:
                STAILQ_FOREACH(fwdev, &fc->devices, link)
                        if (FW_EUI64_EQUAL(fwdev->eui, crom_buf->eui))
                                break;
                if (fwdev == NULL) {
                        if (!FW_EUI64_EQUAL(fc->eui, crom_buf->eui)) {
                                err = FWNODE_INVAL;
                                break;
                        }
                        /* myself */
                        ptr = malloc(CROMSIZE, M_FW, M_WAITOK);
                        len = CROMSIZE;
                        for (i = 0; i < CROMSIZE/4; i++)
                                ((uint32_t *)ptr)[i] = ntohl(fc->config_rom[i]);
                } else {
                        /* found */
                        ptr = (void *)fwdev->csrrom;
                        if (fwdev->rommax < CSRROMOFF)
                                len = 0;
                        else
                                len = fwdev->rommax - CSRROMOFF + 4;
                }
                if (crom_buf->len < len)
                        len = crom_buf->len;
                else
                        crom_buf->len = len;
                err = copyout(ptr, crom_buf->ptr, len);
                if (fwdev == NULL)
                        /* myself */
                        free(ptr, M_FW);
                break;

        default:
                fc->ioctl(dev, cmd, data, flag, td);
                break;
        }
        return err;
}

int
fw_poll(dev_t dev, int events, struct lwp *td)
{
        struct firewire_softc *sc;
        struct fw_xferq *ir;
        int revents, tmp;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        ir = ((struct fw_drv1 *)sc->si_drv1)->ir;
        revents = 0;
        tmp = POLLIN | POLLRDNORM;
        if (events & tmp) {
                if (STAILQ_FIRST(&ir->q) != NULL)
                        revents |= tmp;
                else
                        selrecord(td, &ir->rsel);
        }
        tmp = POLLOUT | POLLWRNORM;
        if (events & tmp)
                /* XXX should be fixed */
                revents |= tmp;

        return revents;
}

paddr_t
fw_mmap(dev_t dev, off_t offset, int nproto)
{
        struct firewire_softc *sc;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return ENXIO;

        return EINVAL;
}

void
fw_strategy(struct bio *bp)
{
        struct firewire_softc *sc;
        dev_t dev = bp->bio_dev;

        sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
        if (sc == NULL)
                return;

        if (DEV_FWMEM(dev)) {
                fwmem_strategy(bp);
                return;
        }

        bp->bio_error = EOPNOTSUPP;
        bp->bio_resid = bp->bio_bcount;
        biodone(bp);
}


static int
fwdev_allocbuf(struct firewire_comm *fc, struct fw_xferq *q,
               struct fw_bufspec *b)
{
        int i;

        if (q->flag & (FWXFERQ_RUNNING | FWXFERQ_EXTBUF))
                return EBUSY;

        q->bulkxfer =
            (struct fw_bulkxfer *)malloc(sizeof(struct fw_bulkxfer) * b->nchunk,
                                                                M_FW, M_WAITOK);
        if (q->bulkxfer == NULL)
                return ENOMEM;

        b->psize = roundup2(b->psize, sizeof(uint32_t));
        q->buf = fwdma_malloc_multiseg(fc, sizeof(uint32_t), b->psize,
            b->nchunk * b->npacket, BUS_DMA_WAITOK);

        if (q->buf == NULL) {
                free(q->bulkxfer, M_FW);
                q->bulkxfer = NULL;
                return ENOMEM;
        }
        q->bnchunk = b->nchunk;
        q->bnpacket = b->npacket;
        q->psize = (b->psize + 3) & ~3;
        q->queued = 0;

        STAILQ_INIT(&q->stvalid);
        STAILQ_INIT(&q->stfree);
        STAILQ_INIT(&q->stdma);
        q->stproc = NULL;

        for (i = 0 ; i < q->bnchunk; i++) {
                q->bulkxfer[i].poffset = i * q->bnpacket;
                q->bulkxfer[i].mbuf = NULL;
                STAILQ_INSERT_TAIL(&q->stfree, &q->bulkxfer[i], link);
        }

        q->flag &= ~FWXFERQ_MODEMASK;
        q->flag |= FWXFERQ_STREAM;
        q->flag |= FWXFERQ_EXTBUF;

        return 0;
}

static int
fwdev_freebuf(struct fw_xferq *q)
{

        if (q->flag & FWXFERQ_EXTBUF) {
                if (q->buf != NULL)
                        fwdma_free_multiseg(q->buf);
                q->buf = NULL;
                free(q->bulkxfer, M_FW);
                q->bulkxfer = NULL;
                q->flag &= ~FWXFERQ_EXTBUF;
                q->psize = 0;
                q->maxq = FWMAXQUEUE;
        }
        return 0;
}

static int
fw_read_async(struct fw_drv1 *d, struct uio *uio, int ioflag)
{
        struct fw_xfer *xfer;
        struct fw_bind *fwb;
        struct fw_pkt *fp;
        const struct tcode_info *tinfo;
        int err = 0;

        mutex_enter(&d->fc->fc_mtx);

        for (;;) {
                xfer = STAILQ_FIRST(&d->rq);
                if (xfer == NULL && err == 0) {
                        err = cv_wait_sig(&d->cv, &d->fc->fc_mtx);
                        if (err) {
                                mutex_exit(&d->fc->fc_mtx);
                                return err;
                        }
                        continue;
                }
                break;
        }

        STAILQ_REMOVE_HEAD(&d->rq, link);
        mutex_exit(&d->fc->fc_mtx);
        fp = &xfer->recv.hdr;
#if 0 /* for GASP ?? */
        if (fc->irx_post != NULL)
                fc->irx_post(fc, fp->mode.ld);
#endif
        tinfo = &xfer->fc->tcode[fp->mode.hdr.tcode];
        err = uiomove((void *)fp, tinfo->hdr_len, uio);
        if (err)
                goto out;
        err = uiomove((void *)xfer->recv.payload, xfer->recv.pay_len, uio);

out:
        /* recycle this xfer */
        fwb = (struct fw_bind *)xfer->sc;
        fw_xfer_unload(xfer);
        xfer->recv.pay_len = PAGE_SIZE;
        mutex_enter(&d->fc->fc_mtx);
        STAILQ_INSERT_TAIL(&fwb->xferlist, xfer, link);
        mutex_exit(&d->fc->fc_mtx);
        return err;
}

static int
fw_write_async(struct fw_drv1 *d, struct uio *uio, int ioflag)
{
        struct fw_xfer *xfer;
        struct fw_pkt pkt;
        const struct tcode_info *tinfo;
        int err;

        memset(&pkt, 0, sizeof(struct fw_pkt));
        if ((err = uiomove((void *)&pkt, sizeof(uint32_t), uio)))
                return err;
        tinfo = &d->fc->tcode[pkt.mode.hdr.tcode];
        if ((err = uiomove((char *)&pkt + sizeof(uint32_t),
            tinfo->hdr_len - sizeof(uint32_t), uio)))
                return err;

        if ((xfer = fw_xfer_alloc_buf(M_FW, uio->uio_resid,
            PAGE_SIZE/*XXX*/)) == NULL)
                return ENOMEM;

        memcpy(&xfer->send.hdr, &pkt, sizeof(struct fw_pkt));
        xfer->send.pay_len = uio->uio_resid;
        if (uio->uio_resid > 0) {
                if ((err =
                    uiomove((void *)xfer->send.payload, uio->uio_resid, uio)))
                        goto out;
        }

        xfer->fc = d->fc;
        xfer->sc = NULL;
        xfer->hand = fw_xferwake;
        xfer->send.spd = 2 /* XXX */;

        if ((err = fw_asyreq(xfer->fc, -1, xfer)))
                goto out;

        if ((err = fw_xferwait(xfer)))
                goto out;

        if (xfer->resp != 0) {
                err = xfer->resp;
                goto out;
        }

        if (xfer->flag == FWXF_RCVD) {
                mutex_enter(&xfer->fc->fc_mtx);
                STAILQ_INSERT_TAIL(&d->rq, xfer, link);
                mutex_exit(&xfer->fc->fc_mtx);
                return 0;
        }

out:
        fw_xfer_free(xfer);
        return err;
}

static void
fw_hand(struct fw_xfer *xfer)
{
        struct fw_bind *fwb;
        struct fw_drv1 *d;

        fwb = (struct fw_bind *)xfer->sc;
        d = (struct fw_drv1 *)fwb->sc;
        mutex_enter(&xfer->fc->fc_mtx);
        STAILQ_INSERT_TAIL(&d->rq, xfer, link);
        cv_broadcast(&d->cv);
        mutex_exit(&xfer->fc->fc_mtx);
}