/*
 * 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/firewire.c,v 1.68 2004/01/08 14:58:09 simokawa Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>

#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/bus.h>            /* used by smbus and newbus */
#include <sys/sysctl.h>
#include <sys/thread2.h>

#include <bus/firewire/firewire.h>
#include <bus/firewire/firewirereg.h>
#include <bus/firewire/fwmem.h>
#include <bus/firewire/iec13213.h>
#include <bus/firewire/iec68113.h>

struct crom_src_buf {
        struct crom_src src;
        struct crom_chunk root;
        struct crom_chunk vendor;
        struct crom_chunk hw;
};

int firewire_debug=0, try_bmr=1, hold_count=3;
SYSCTL_INT(_debug, OID_AUTO, firewire_debug, CTLFLAG_RW, &firewire_debug, 0,
        "FireWire driver debug flag");
SYSCTL_NODE(_hw, OID_AUTO, firewire, CTLFLAG_RD, 0, "FireWire Subsystem");
SYSCTL_INT(_hw_firewire, OID_AUTO, try_bmr, CTLFLAG_RW, &try_bmr, 0,
        "Try to be a bus manager");
SYSCTL_INT(_hw_firewire, OID_AUTO, hold_count, CTLFLAG_RW, &hold_count, 0,
        "Number of count of bus resets for removing lost device information");

MALLOC_DEFINE(M_FW, "firewire", "FireWire");
MALLOC_DEFINE(M_FWXFER, "fw_xfer", "XFER/FireWire");

#define FW_MAXASYRTY 4

devclass_t firewire_devclass;

static int firewire_probe       (device_t);
static int firewire_attach      (device_t);
static int firewire_detach      (device_t);
static int firewire_resume      (device_t);
#if 0
static int firewire_shutdown    (device_t);
#endif
static device_t firewire_add_child (device_t, device_t, int, const char *, int);
static void fw_try_bmr (void *);
static void fw_try_bmr_callback (struct fw_xfer *);
static void fw_asystart (struct fw_xfer *);
static int fw_get_tlabel (struct firewire_comm *, struct fw_xfer *);
static void fw_bus_probe (struct firewire_comm *);
static void fw_bus_explore (struct firewire_comm *);
static void fw_bus_explore_callback (struct fw_xfer *);
static void fw_attach_dev (struct firewire_comm *);
#ifdef FW_VMACCESS
static void fw_vmaccess (struct fw_xfer *);
#endif
struct fw_xfer *asyreqq (struct firewire_comm *, u_int8_t, u_int8_t, u_int8_t,
        u_int32_t, u_int32_t, void (*)(struct fw_xfer *));
static int fw_bmr (struct firewire_comm *);

/*
 * note: bus_generic_identify() will automatically install a "firewire"
 * device under any attached fwohci device.
 */
static device_method_t firewire_methods[] = {
        /* Device interface */
        DEVMETHOD(device_identify,      bus_generic_identify),
        DEVMETHOD(device_probe,         firewire_probe),
        DEVMETHOD(device_attach,        firewire_attach),
        DEVMETHOD(device_detach,        firewire_detach),
        DEVMETHOD(device_suspend,       bus_generic_suspend),
        DEVMETHOD(device_resume,        firewire_resume),
        DEVMETHOD(device_shutdown,      bus_generic_shutdown),

        /* Bus interface */
        DEVMETHOD(bus_add_child,        firewire_add_child),
        DEVMETHOD(bus_print_child,      bus_generic_print_child),

        DEVMETHOD_END
};
char *linkspeed[] = {
        "S100", "S200", "S400", "S800",
        "S1600", "S3200", "undef", "undef"
};

static char *tcode_str[] = {
        "WREQQ", "WREQB", "WRES",   "undef",
        "RREQQ", "RREQB", "RRESQ",  "RRESB",
        "CYCS",  "LREQ",  "STREAM", "LRES",
        "undef", "undef", "PHY",    "undef"
};

/* IEEE-1394a Table C-2 Gap count as a function of hops*/
#define MAX_GAPHOP 15
u_int gap_cnt[] = { 5,  5,  7,  8, 10, 13, 16, 18,
                   21, 24, 26, 29, 32, 35, 37, 40};

static driver_t firewire_driver = {
        "firewire",
        firewire_methods,
        sizeof(struct firewire_softc),
};

/*
 * Lookup fwdev by node id.
 */
struct fw_device *
fw_noderesolve_nodeid(struct firewire_comm *fc, int dst)
{
        struct fw_device *fwdev;

        crit_enter();
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (fwdev->dst == dst && fwdev->status != FWDEVINVAL)
                        break;
        crit_exit();

        return fwdev;
}

/*
 * Lookup fwdev by EUI64.
 */
struct fw_device *
fw_noderesolve_eui64(struct firewire_comm *fc, struct fw_eui64 *eui)
{
        struct fw_device *fwdev;

        crit_enter();
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (FW_EUI64_EQUAL(fwdev->eui, *eui))
                        break;
        crit_exit();

        if(fwdev == NULL) return NULL;
        if(fwdev->status == FWDEVINVAL) return NULL;
        return fwdev;
}

/*
 * Async. request procedure for userland application.
 */
int
fw_asyreq(struct firewire_comm *fc, int sub, struct fw_xfer *xfer)
{
        int err = 0;
        struct fw_xferq *xferq;
        int tl = 0, len;
        struct fw_pkt *fp;
        int tcode;
        struct tcode_info *info;

        if(xfer == NULL) return EINVAL;
        if(xfer->act.hand == NULL){
                kprintf("act.hand == NULL\n");
                return EINVAL;
        }
        fp = &xfer->send.hdr;

        tcode = fp->mode.common.tcode & 0xf;
        info = &fc->tcode[tcode];
        if (info->flag == 0) {
                kprintf("invalid tcode=%x\n", tcode);
                return EINVAL;
        }
        if (info->flag & FWTI_REQ)
                xferq = fc->atq;
        else
                xferq = fc->ats;
        len = info->hdr_len;
        if (xfer->send.pay_len > MAXREC(fc->maxrec)) {
                kprintf("send.pay_len > maxrec\n");
                return EINVAL;
        }
        if (info->flag & FWTI_BLOCK_STR)
                len = fp->mode.stream.len;
        else if (info->flag & FWTI_BLOCK_ASY)
                len = fp->mode.rresb.len;
        else
                len = 0;
        if (len != xfer->send.pay_len){
                kprintf("len(%d) != send.pay_len(%d) %s(%x)\n",
                    len, xfer->send.pay_len, tcode_str[tcode], tcode);
                return EINVAL; 
        }

        if(xferq->start == NULL){
                kprintf("xferq->start == NULL\n");
                return EINVAL;
        }
        if(!(xferq->queued < xferq->maxq)){
                device_printf(fc->bdev, "Discard a packet (queued=%d)\n",
                        xferq->queued);
                return EINVAL;
        }

        microtime(&xfer->tv);
        if (info->flag & FWTI_TLABEL) {
                if((tl = fw_get_tlabel(fc, xfer)) == -1 )
                        return EIO;
                fp->mode.hdr.tlrt = tl << 2;
        }

        xfer->tl = tl;
        xfer->resp = 0;
        xfer->fc = fc;
        xfer->q = xferq;
        xfer->retry_req = fw_asybusy;

        fw_asystart(xfer);
        return err;
}
/*
 * Wakeup blocked process.
 */
void
fw_asy_callback(struct fw_xfer *xfer){
        wakeup(xfer);
        return;
}
/*
 * Postpone to later retry.
 */
void
fw_asybusy(struct fw_xfer *xfer)
{
        kprintf("fw_asybusy\n");
/*
        xfer->ch =  timeout((timeout_t *)fw_asystart, (void *)xfer, 20000);
*/
#if 0
        DELAY(20000);
#endif
        fw_asystart(xfer);
        return;
}

/*
 * Async. request with given xfer structure.
 */
static void
fw_asystart(struct fw_xfer *xfer)
{
        struct firewire_comm *fc = xfer->fc;

        if(xfer->retry++ >= fc->max_asyretry){
                device_printf(fc->bdev, "max_asyretry exceeded\n");
                xfer->resp = EBUSY;
                xfer->state = FWXF_BUSY;
                xfer->act.hand(xfer);
                return;
        }
#if 0 /* XXX allow bus explore packets only after bus rest */
        if (fc->status < FWBUSEXPLORE) {
                xfer->resp = EAGAIN;
                xfer->state = FWXF_BUSY;
                if (xfer->act.hand != NULL)
                        xfer->act.hand(xfer);
                return;
        }
#endif
        crit_enter();
        xfer->state = FWXF_INQ;
        STAILQ_INSERT_TAIL(&xfer->q->q, xfer, link);
        xfer->q->queued ++;
        crit_exit();
        /* XXX just queue for mbuf */
        if (xfer->mbuf == NULL)
                xfer->q->start(fc);
        return;
}

static int
firewire_probe(device_t dev)
{
        device_set_desc(dev, "IEEE1394(FireWire) bus");
        return (0);
}

static void
firewire_xfer_timeout(struct firewire_comm *fc)
{
        struct fw_xfer *xfer;
        struct tlabel *tl;
        struct timeval tv;
        struct timeval split_timeout;
        int i;

        split_timeout.tv_sec = 0;
        split_timeout.tv_usec = 200 * 1000;      /* 200 msec */

        microtime(&tv);
        timevalsub(&tv, &split_timeout);

        crit_enter();
        for (i = 0; i < 0x40; i ++) {
                while ((tl = STAILQ_FIRST(&fc->tlabels[i])) != NULL) {
                        xfer = tl->xfer;
                        if (timevalcmp(&xfer->tv, &tv, >))
                                /* the rests are newer than this */
                                break;
                        if (xfer->state == FWXF_START)
                                /* not sent yet */
                                break;
                        device_printf(fc->bdev,
                                "split transaction timeout dst=0x%x tl=0x%x state=%d\n",
                                xfer->send.hdr.mode.hdr.dst, i, xfer->state);
                        xfer->resp = ETIMEDOUT;
                        STAILQ_REMOVE_HEAD(&fc->tlabels[i], link);
                        fw_xfer_done(xfer);
                }
        }
        crit_exit();
}

#define WATCHDOC_HZ 10
static void
firewire_watchdog(void *arg)
{
        struct firewire_comm *fc;
        static int watchdoc_clock = 0;

        fc = (struct firewire_comm *)arg;

        /*
         * At boot stage, the device interrupt is disabled and
         * We encounter a timeout easily. To avoid this,
         * ignore clock interrupt for a while.
         */
        if (watchdoc_clock > WATCHDOC_HZ * 15) {
                firewire_xfer_timeout(fc);
                fc->timeout(fc);
        } else
                watchdoc_clock ++;

        callout_reset(&fc->timeout_callout, hz / WATCHDOC_HZ,
                        (void *)firewire_watchdog, (void *)fc);
}

/*
 * The attach routine.
 */
static int
firewire_attach(device_t dev)
{
        struct firewire_softc *sc = device_get_softc(dev);
        device_t pa = device_get_parent(dev);
        struct firewire_comm *fc;

        fc = (struct firewire_comm *)device_get_softc(pa);
        sc->fc = fc;
        fc->status = FWBUSNOTREADY;

        if( fc->nisodma > FWMAXNDMA) fc->nisodma = FWMAXNDMA;

        fwdev_makedev(sc);

        CALLOUT_INIT(&sc->fc->timeout_callout);
        CALLOUT_INIT(&sc->fc->bmr_callout);
        CALLOUT_INIT(&sc->fc->retry_probe_callout);
        CALLOUT_INIT(&sc->fc->busprobe_callout);

        callout_reset(&sc->fc->timeout_callout, hz,
                        (void *)firewire_watchdog, (void *)sc->fc);

        /* Locate our children */
        bus_generic_probe(dev);

        /* launch attachement of the added children */
        bus_generic_attach(dev);

        /* bus_reset */
        fw_busreset(fc);
        fc->ibr(fc);

        return 0;
}

/*
 * Attach it as child.
 */
static device_t
firewire_add_child(device_t bus, device_t parent, int order, const char *name, int unit)
{
        device_t child;
        struct firewire_softc *sc;

        sc = (struct firewire_softc *)device_get_softc(parent);
        child = device_add_child(parent, name, unit);
        if (child) {
                device_set_ivars(child, sc->fc);
                device_probe_and_attach(child);
        }

        return child;
}

static int
firewire_resume(device_t dev)
{
        struct firewire_softc *sc;

        sc = (struct firewire_softc *)device_get_softc(dev);
        sc->fc->status = FWBUSNOTREADY;
        
        bus_generic_resume(dev);

        return(0);
}

/*
 * Dettach it.
 */
static int
firewire_detach(device_t dev)
{
        struct firewire_softc *sc;
        struct csrdir *csrd, *next;
        struct fw_device *fwdev, *fwdev_next;
        int err;

        sc = (struct firewire_softc *)device_get_softc(dev);
        if ((err = fwdev_destroydev(sc)) != 0)
                return err;

        if ((err = bus_generic_detach(dev)) != 0)
                return err;

        callout_stop(&sc->fc->timeout_callout);
        callout_stop(&sc->fc->bmr_callout);
        callout_stop(&sc->fc->retry_probe_callout);
        callout_stop(&sc->fc->busprobe_callout);

        /* XXX xfree_free and callout_stop on all xfers */
        for (fwdev = STAILQ_FIRST(&sc->fc->devices); fwdev != NULL;
                                                        fwdev = fwdev_next) {
                fwdev_next = STAILQ_NEXT(fwdev, link);
                kfree(fwdev, M_FW);
        }
        for (csrd = SLIST_FIRST(&sc->fc->csrfree); csrd != NULL; csrd = next) {
                next = SLIST_NEXT(csrd, link);
                kfree(csrd, M_FW);
        }
        kfree(sc->fc->topology_map, M_FW);
        kfree(sc->fc->speed_map, M_FW);
        kfree(sc->fc->crom_src_buf, M_FW);
        return(0);
}
#if 0
static int
firewire_shutdown( device_t dev )
{
        return 0;
}
#endif


static void
fw_xferq_drain(struct fw_xferq *xferq)
{
        struct fw_xfer *xfer;

        while ((xfer = STAILQ_FIRST(&xferq->q)) != NULL) {
                STAILQ_REMOVE_HEAD(&xferq->q, link);
                xferq->queued --;
                xfer->resp = EAGAIN;
                xfer->state = FWXF_SENTERR;
                fw_xfer_done(xfer);
        }
}

void
fw_drain_txq(struct firewire_comm *fc)
{
        int i;

        fw_xferq_drain(fc->atq);
        fw_xferq_drain(fc->ats);
        for(i = 0; i < fc->nisodma; i++)
                fw_xferq_drain(fc->it[i]);
}

static void
fw_reset_csr(struct firewire_comm *fc)
{
        int i;

        CSRARC(fc, STATE_CLEAR)
                        = 1 << 23 | 0 << 17 | 1 << 16 | 1 << 15 | 1 << 14 ;
        CSRARC(fc, STATE_SET) = CSRARC(fc, STATE_CLEAR);
        CSRARC(fc, NODE_IDS) = 0x3f;

        CSRARC(fc, TOPO_MAP + 8) = 0;
        fc->irm = -1;

        fc->max_node = -1;

        for(i = 2; i < 0x100/4 - 2 ; i++){
                CSRARC(fc, SPED_MAP + i * 4) = 0;
        }
        CSRARC(fc, STATE_CLEAR) = 1 << 23 | 0 << 17 | 1 << 16 | 1 << 15 | 1 << 14 ;
        CSRARC(fc, STATE_SET) = CSRARC(fc, STATE_CLEAR);
        CSRARC(fc, RESET_START) = 0;
        CSRARC(fc, SPLIT_TIMEOUT_HI) = 0;
        CSRARC(fc, SPLIT_TIMEOUT_LO) = 800 << 19;
        CSRARC(fc, CYCLE_TIME) = 0x0;
        CSRARC(fc, BUS_TIME) = 0x0;
        CSRARC(fc, BUS_MGR_ID) = 0x3f;
        CSRARC(fc, BANDWIDTH_AV) = 4915;
        CSRARC(fc, CHANNELS_AV_HI) = 0xffffffff;
        CSRARC(fc, CHANNELS_AV_LO) = 0xffffffff;
        CSRARC(fc, IP_CHANNELS) = (1 << 31);

        CSRARC(fc, CONF_ROM) = 0x04 << 24;
        CSRARC(fc, CONF_ROM + 4) = 0x31333934; /* means strings 1394 */
        CSRARC(fc, CONF_ROM + 8) = 1 << 31 | 1 << 30 | 1 << 29 |
                                1 << 28 | 0xff << 16 | 0x09 << 8;
        CSRARC(fc, CONF_ROM + 0xc) = 0;

/* DV depend CSRs see blue book */
        CSRARC(fc, oPCR) &= ~DV_BROADCAST_ON; 
        CSRARC(fc, iPCR) &= ~DV_BROADCAST_ON; 

        CSRARC(fc, STATE_CLEAR) &= ~(1 << 23 | 1 << 15 | 1 << 14 );
        CSRARC(fc, STATE_SET) = CSRARC(fc, STATE_CLEAR);
}

static void
fw_init_crom(struct firewire_comm *fc)
{
        struct crom_src *src;

        fc->crom_src_buf = (struct crom_src_buf *)
                kmalloc(sizeof(struct crom_src_buf), M_FW, M_WAITOK | M_ZERO);

        src = &fc->crom_src_buf->src;
        bzero(src, sizeof(struct crom_src));

        /* BUS info sample */
        src->hdr.info_len = 4;

        src->businfo.bus_name = CSR_BUS_NAME_IEEE1394;

        src->businfo.irmc = 1;
        src->businfo.cmc = 1;
        src->businfo.isc = 1;
        src->businfo.bmc = 1;
        src->businfo.pmc = 0;
        src->businfo.cyc_clk_acc = 100;
        src->businfo.max_rec = fc->maxrec;
        src->businfo.max_rom = MAXROM_4;
        src->businfo.generation = 1;
        src->businfo.link_spd = fc->speed;

        src->businfo.eui64.hi = fc->eui.hi;
        src->businfo.eui64.lo = fc->eui.lo;

        STAILQ_INIT(&src->chunk_list);

        fc->crom_src = src;
        fc->crom_root = &fc->crom_src_buf->root;
}

static void
fw_reset_crom(struct firewire_comm *fc)
{
        struct crom_src_buf *buf;
        struct crom_src *src;
        struct crom_chunk *root;

        if (fc->crom_src_buf == NULL)
                fw_init_crom(fc);

        buf =  fc->crom_src_buf;
        src = fc->crom_src;
        root = fc->crom_root;

        STAILQ_INIT(&src->chunk_list);

        bzero(root, sizeof(struct crom_chunk));
        crom_add_chunk(src, NULL, root, 0);
        crom_add_entry(root, CSRKEY_NCAP, 0x0083c0); /* XXX */
        /* private company_id */
        crom_add_entry(root, CSRKEY_VENDOR, CSRVAL_VENDOR_PRIVATE);
        crom_add_simple_text(src, root, &buf->vendor, "DragonFly Project");
        crom_add_entry(root, CSRKEY_HW, __DragonFly_version);
        crom_add_simple_text(src, root, &buf->hw, hostname);
}

/*
 * Called after bus reset.
 */
void
fw_busreset(struct firewire_comm *fc)
{
        struct firewire_dev_comm *fdc;
        struct crom_src *src;
        device_t *devlistp;
        void *newrom;
        int i, devcnt;

        switch(fc->status){
        case FWBUSMGRELECT:
                callout_stop(&fc->bmr_callout);
                break;
        default:
                break;
        }
        fc->status = FWBUSRESET;
        fw_reset_csr(fc);
        fw_reset_crom(fc);

        if (device_get_children(fc->bdev, &devlistp, &devcnt) == 0) {
                for( i = 0 ; i < devcnt ; i++)
                        if (device_get_state(devlistp[i]) >= DS_ATTACHED)  {
                                fdc = device_get_softc(devlistp[i]);
                                if (fdc->post_busreset != NULL)
                                        fdc->post_busreset(fdc);
                        }
                kfree(devlistp, M_TEMP);
        }

        newrom = kmalloc(CROMSIZE, M_FW, M_WAITOK | M_ZERO);
        src = &fc->crom_src_buf->src;
        crom_load(src, (u_int32_t *)newrom, CROMSIZE);
        if (bcmp(newrom, fc->config_rom, CROMSIZE) != 0) {
                /* bump generation and reload */
                src->businfo.generation ++;
                /* generation must be between 0x2 and 0xF */
                if (src->businfo.generation < 2)
                        src->businfo.generation ++;
                crom_load(src, (u_int32_t *)newrom, CROMSIZE);
                bcopy(newrom, (void *)fc->config_rom, CROMSIZE);
        }
        kfree(newrom, M_FW);
}

/* Call once after reboot */
void
fw_init(struct firewire_comm *fc)
{
        int i;
        struct csrdir *csrd;
#ifdef FW_VMACCESS
        struct fw_xfer *xfer;
        struct fw_bind *fwb;
#endif

        fc->max_asyretry = FW_MAXASYRTY;

        fc->arq->queued = 0;
        fc->ars->queued = 0;
        fc->atq->queued = 0;
        fc->ats->queued = 0;

        fc->arq->buf = NULL;
        fc->ars->buf = NULL;
        fc->atq->buf = NULL;
        fc->ats->buf = NULL;

        fc->arq->flag = 0;
        fc->ars->flag = 0;
        fc->atq->flag = 0;
        fc->ats->flag = 0;

        STAILQ_INIT(&fc->atq->q);
        STAILQ_INIT(&fc->ats->q);

        for( i = 0 ; i < fc->nisodma ; i ++ ){
                fc->it[i]->queued = 0;
                fc->ir[i]->queued = 0;

                fc->it[i]->start = NULL;
                fc->ir[i]->start = NULL;

                fc->it[i]->buf = NULL;
                fc->ir[i]->buf = NULL;

                fc->it[i]->flag = FWXFERQ_STREAM;
                fc->ir[i]->flag = FWXFERQ_STREAM;

                STAILQ_INIT(&fc->it[i]->q);
                STAILQ_INIT(&fc->ir[i]->q);

                STAILQ_INIT(&fc->it[i]->binds);
                STAILQ_INIT(&fc->ir[i]->binds);
        }

        fc->arq->maxq = FWMAXQUEUE;
        fc->ars->maxq = FWMAXQUEUE;
        fc->atq->maxq = FWMAXQUEUE;
        fc->ats->maxq = FWMAXQUEUE;

        for( i = 0 ; i < fc->nisodma ; i++){
                fc->ir[i]->maxq = FWMAXQUEUE;
                fc->it[i]->maxq = FWMAXQUEUE;
        }
/* Initialize csr registers */
        fc->topology_map = kmalloc(sizeof(struct fw_topology_map),
                                    M_FW, M_WAITOK | M_ZERO);
        fc->speed_map = kmalloc(sizeof(struct fw_speed_map),
                                    M_FW, M_WAITOK | M_ZERO);
        CSRARC(fc, TOPO_MAP) = 0x3f1 << 16;
        CSRARC(fc, TOPO_MAP + 4) = 1;
        CSRARC(fc, SPED_MAP) = 0x3f1 << 16;
        CSRARC(fc, SPED_MAP + 4) = 1;

        STAILQ_INIT(&fc->devices);

/* Initialize csr ROM work space */
        SLIST_INIT(&fc->ongocsr);
        SLIST_INIT(&fc->csrfree);
        for( i = 0 ; i < FWMAXCSRDIR ; i++){
                csrd = kmalloc(sizeof(struct csrdir), M_FW, M_WAITOK);
                SLIST_INSERT_HEAD(&fc->csrfree, csrd, link);
        }

/* Initialize Async handlers */
        STAILQ_INIT(&fc->binds);
        for( i = 0 ; i < 0x40 ; i++){
                STAILQ_INIT(&fc->tlabels[i]);
        }

/* DV depend CSRs see blue book */
#if 0
        CSRARC(fc, oMPR) = 0x3fff0001; /* # output channel = 1 */
        CSRARC(fc, oPCR) = 0x8000007a;
        for(i = 4 ; i < 0x7c/4 ; i+=4){
                CSRARC(fc, i + oPCR) = 0x8000007a; 
        }
 
        CSRARC(fc, iMPR) = 0x00ff0001; /* # input channel = 1 */
        CSRARC(fc, iPCR) = 0x803f0000;
        for(i = 4 ; i < 0x7c/4 ; i+=4){
                CSRARC(fc, i + iPCR) = 0x0; 
        }
#endif

        fc->crom_src_buf = NULL;

#ifdef FW_VMACCESS
        xfer = fw_xfer_alloc();
        if(xfer == NULL) return;

        fwb = kmalloc(sizeof (struct fw_bind), M_FW, M_WAITOK);
        xfer->act.hand = fw_vmaccess;
        xfer->fc = fc;
        xfer->sc = NULL;

        fwb->start_hi = 0x2;
        fwb->start_lo = 0;
        fwb->addrlen = 0xffffffff;
        fwb->xfer = xfer;
        fw_bindadd(fc, fwb);
#endif
}

#define BIND_CMP(addr, fwb) (((addr) < (fwb)->start)?-1:\
    ((fwb)->end < (addr))?1:0)

/*
 * To lookup binded process from IEEE1394 address.
 */
struct fw_bind *
fw_bindlookup(struct firewire_comm *fc, u_int16_t dest_hi, u_int32_t dest_lo)
{
        u_int64_t addr;
        struct fw_bind *tfw;

        addr = ((u_int64_t)dest_hi << 32) | dest_lo;
        STAILQ_FOREACH(tfw, &fc->binds, fclist)
                if (tfw->act_type != FWACT_NULL && BIND_CMP(addr, tfw) == 0)
                        return(tfw);
        return(NULL);
}

/*
 * To bind IEEE1394 address block to process.
 */
int
fw_bindadd(struct firewire_comm *fc, struct fw_bind *fwb)
{
        struct fw_bind *tfw, *prev = NULL;

        if (fwb->start > fwb->end) {
                kprintf("%s: invalid range\n", __func__);
                return EINVAL;
        }

        STAILQ_FOREACH(tfw, &fc->binds, fclist) {
                if (fwb->end < tfw->start)
                        break;
                prev = tfw;
        }
        if (prev == NULL) {
                STAILQ_INSERT_HEAD(&fc->binds, fwb, fclist);
                goto out;
        }
        if (prev->end < fwb->start) {
                STAILQ_INSERT_AFTER(&fc->binds, prev, fwb, fclist);
                goto out;
        }

        kprintf("%s: bind failed\n", __func__);
        return (EBUSY);

out:
        if (fwb->act_type == FWACT_CH)
                STAILQ_INSERT_HEAD(&fc->ir[fwb->sub]->binds, fwb, chlist);
        return (0);
}

/*
 * To free IEEE1394 address block.
 */
int
fw_bindremove(struct firewire_comm *fc, struct fw_bind *fwb)
{
#if 0
        struct fw_xfer *xfer, *next;
#endif
        struct fw_bind *tfw;

        crit_enter();
        STAILQ_FOREACH(tfw, &fc->binds, fclist)
                if (tfw == fwb) {
                        STAILQ_REMOVE(&fc->binds, fwb, fw_bind, fclist);
                        goto found;
                }

        kprintf("%s: no such bind\n", __func__);
        crit_exit();
        return (1);
found:
#if 0
        /* shall we do this? */
        for (xfer = STAILQ_FIRST(&fwb->xferlist); xfer != NULL; xfer = next) {
                next = STAILQ_NEXT(xfer, link);
                fw_xfer_free(xfer);
        }
        STAILQ_INIT(&fwb->xferlist);
#endif

        crit_exit();
        return 0;
}

/*
 * To free transaction label.
 */
static void
fw_tl_free(struct firewire_comm *fc, struct fw_xfer *xfer)
{
        struct tlabel *tl;

        crit_enter();
        for( tl = STAILQ_FIRST(&fc->tlabels[xfer->tl]); tl != NULL;
                tl = STAILQ_NEXT(tl, link)){
                if(tl->xfer == xfer){
                        STAILQ_REMOVE(&fc->tlabels[xfer->tl], tl, tlabel, link);
                        kfree(tl, M_FW);
                        break;
                }
        }
        crit_exit();
}

/*
 * To obtain XFER structure by transaction label.
 */
static struct fw_xfer *
fw_tl2xfer(struct firewire_comm *fc, int node, int tlabel)
{
        struct fw_xfer *xfer;
        struct tlabel *tl;

        crit_enter();

        for( tl = STAILQ_FIRST(&fc->tlabels[tlabel]); tl != NULL;
                tl = STAILQ_NEXT(tl, link)){
                if(tl->xfer->send.hdr.mode.hdr.dst == node){
                        xfer = tl->xfer;
                        crit_exit();
                        if (firewire_debug > 2)
                                kprintf("fw_tl2xfer: found tl=%d\n", tlabel);
                        return(xfer);
                }
        }
        if (firewire_debug > 1)
                kprintf("fw_tl2xfer: not found tl=%d\n", tlabel);
        crit_exit();
        return(NULL);
}

/*
 * To allocate IEEE1394 XFER structure.
 */
struct fw_xfer *
fw_xfer_alloc(struct malloc_type *type)
{
        struct fw_xfer *xfer;

        xfer = kmalloc(sizeof(struct fw_xfer), type, M_INTWAIT | M_ZERO);
        xfer->malloc = type;

        return xfer;
}

struct fw_xfer *
fw_xfer_alloc_buf(struct malloc_type *type, int send_len, int recv_len)
{
        struct fw_xfer *xfer;

        xfer = fw_xfer_alloc(type);
        if (xfer == NULL)
                return(NULL);
        xfer->send.pay_len = send_len;
        xfer->recv.pay_len = recv_len;
        if (send_len > 0) {
                xfer->send.payload = kmalloc(send_len, type, M_INTWAIT | M_ZERO);
                if (xfer->send.payload == NULL) {
                        fw_xfer_free(xfer);
                        return(NULL);
                }
        }
        if (recv_len > 0) {
                xfer->recv.payload = kmalloc(recv_len, type, M_INTWAIT);
                if (xfer->recv.payload == NULL) {
                        if (xfer->send.payload != NULL)
                                kfree(xfer->send.payload, type);
                        fw_xfer_free(xfer);
                        return(NULL);
                }
        }
        return(xfer);
}

/*
 * IEEE1394 XFER post process.
 */
void
fw_xfer_done(struct fw_xfer *xfer)
{
        if (xfer->act.hand == NULL) {
                kprintf("act.hand == NULL\n");
                return;
        }

        if (xfer->fc == NULL)
                panic("fw_xfer_done: why xfer->fc is NULL?");

        xfer->act.hand(xfer);
}

void
fw_xfer_unload(struct fw_xfer* xfer)
{
        if(xfer == NULL ) return;
        if(xfer->state == FWXF_INQ){
                kprintf("fw_xfer_free FWXF_INQ\n");
                crit_enter();
                STAILQ_REMOVE(&xfer->q->q, xfer, fw_xfer, link);
                xfer->q->queued --;
                crit_exit();
        }
        if (xfer->fc != NULL) {
#if 1
                if(xfer->state == FWXF_START)
                        /*
                         * This could happen if:
                         *  1. We call fwohci_arcv() before fwohci_txd().
                         *  2. firewire_watch() is called.
                         */
                        kprintf("fw_xfer_free FWXF_START\n");
#endif
                fw_tl_free(xfer->fc, xfer);
        }
        xfer->state = FWXF_INIT;
        xfer->resp = 0;
        xfer->retry = 0;
}
/*
 * To free IEEE1394 XFER structure. 
 */
void
fw_xfer_free_buf( struct fw_xfer* xfer)
{
        if (xfer == NULL) {
                kprintf("%s: xfer == NULL\n", __func__);
                return;
        }
        fw_xfer_unload(xfer);
        if(xfer->send.payload != NULL){
                kfree(xfer->send.payload, xfer->malloc);
        }
        if(xfer->recv.payload != NULL){
                kfree(xfer->recv.payload, xfer->malloc);
        }
        kfree(xfer, xfer->malloc);
}

void
fw_xfer_free( struct fw_xfer* xfer)
{
        if (xfer == NULL) {
                kprintf("%s: xfer == NULL\n", __func__);
                return;
        }
        fw_xfer_unload(xfer);
        kfree(xfer, xfer->malloc);
}

void
fw_asy_callback_free(struct fw_xfer *xfer)
{
#if 0
        kprintf("asyreq done state=%d resp=%d\n",
                                xfer->state, xfer->resp);
#endif
        fw_xfer_free(xfer);
}

/*
 * To configure PHY. 
 */
static void
fw_phy_config(struct firewire_comm *fc, int root_node, int gap_count)
{
        struct fw_xfer *xfer;
        struct fw_pkt *fp;

        fc->status = FWBUSPHYCONF;

        xfer = fw_xfer_alloc(M_FWXFER);
        if (xfer == NULL)
                return;
        xfer->fc = fc;
        xfer->retry_req = fw_asybusy;
        xfer->act.hand = fw_asy_callback_free;

        fp = &xfer->send.hdr;
        fp->mode.ld[1] = 0;
        if (root_node >= 0)
                fp->mode.ld[1] |= (root_node & 0x3f) << 24 | 1 << 23;
        if (gap_count >= 0)
                fp->mode.ld[1] |= 1 << 22 | (gap_count & 0x3f) << 16;
        fp->mode.ld[2] = ~fp->mode.ld[1];
/* XXX Dangerous, how to pass PHY packet to device driver */
        fp->mode.common.tcode |= FWTCODE_PHY;

        if (firewire_debug)
                kprintf("send phy_config root_node=%d gap_count=%d\n",
                                                root_node, gap_count);
        fw_asyreq(fc, -1, xfer);
}

#if 0
/*
 * Dump self ID. 
 */
static void
fw_print_sid(u_int32_t sid)
{
        union fw_self_id *s;
        s = (union fw_self_id *) &sid;
        kprintf("node:%d link:%d gap:%d spd:%d del:%d con:%d pwr:%d"
                " p0:%d p1:%d p2:%d i:%d m:%d\n",
                s->p0.phy_id, s->p0.link_active, s->p0.gap_count,
                s->p0.phy_speed, s->p0.phy_delay, s->p0.contender,
                s->p0.power_class, s->p0.port0, s->p0.port1,
                s->p0.port2, s->p0.initiated_reset, s->p0.more_packets);
}
#endif

/*
 * To receive self ID. 
 */
void
fw_sidrcv(struct firewire_comm* fc, u_int32_t *sid, u_int len)
{
        u_int32_t *p;
        union fw_self_id *self_id;
        u_int i, j, node, c_port = 0, i_branch = 0;

        fc->sid_cnt = len /(sizeof(u_int32_t) * 2);
        fc->status = FWBUSINIT;
        fc->max_node = fc->nodeid & 0x3f;
        CSRARC(fc, NODE_IDS) = ((u_int32_t)fc->nodeid) << 16;
        fc->status = FWBUSCYMELECT;
        fc->topology_map->crc_len = 2;
        fc->topology_map->generation ++;
        fc->topology_map->self_id_count = 0;
        fc->topology_map->node_count = 0;
        fc->speed_map->generation ++;
        fc->speed_map->crc_len = 1 + (64*64 + 3) / 4;
        self_id = &fc->topology_map->self_id[0];
        for(i = 0; i < fc->sid_cnt; i ++){
                if (sid[1] != ~sid[0]) {
                        kprintf("fw_sidrcv: invalid self-id packet\n");
                        sid += 2;
                        continue;
                }
                *self_id = *((union fw_self_id *)sid);
                fc->topology_map->crc_len++;
                if(self_id->p0.sequel == 0){
                        fc->topology_map->node_count ++;
                        c_port = 0;
#if 0
                        fw_print_sid(sid[0]);
#endif
                        node = self_id->p0.phy_id;
                        if(fc->max_node < node){
                                fc->max_node = self_id->p0.phy_id;
                        }
                        /* XXX I'm not sure this is the right speed_map */
                        fc->speed_map->speed[node][node]
                                        = self_id->p0.phy_speed;
                        for (j = 0; j < node; j ++) {
                                fc->speed_map->speed[j][node]
                                        = fc->speed_map->speed[node][j]
                                        = min(fc->speed_map->speed[j][j],
                                                        self_id->p0.phy_speed);
                        }
                        if ((fc->irm == -1 || self_id->p0.phy_id > fc->irm) &&
                          (self_id->p0.link_active && self_id->p0.contender)) {
                                fc->irm = self_id->p0.phy_id;
                        }
                        if(self_id->p0.port0 >= 0x2){
                                c_port++;
                        }
                        if(self_id->p0.port1 >= 0x2){
                                c_port++;
                        }
                        if(self_id->p0.port2 >= 0x2){
                                c_port++;
                        }
                }
                if(c_port > 2){
                        i_branch += (c_port - 2);
                }
                sid += 2;
                self_id++;
                fc->topology_map->self_id_count ++;
        }
        device_printf(fc->bdev, "%d nodes", fc->max_node + 1);
        /* CRC */
        fc->topology_map->crc = fw_crc16(
                        (u_int32_t *)&fc->topology_map->generation,
                        fc->topology_map->crc_len * 4);
        fc->speed_map->crc = fw_crc16(
                        (u_int32_t *)&fc->speed_map->generation,
                        fc->speed_map->crc_len * 4);
        /* byteswap and copy to CSR */
        p = (u_int32_t *)fc->topology_map;
        for (i = 0; i <= fc->topology_map->crc_len; i++)
                CSRARC(fc, TOPO_MAP + i * 4) = htonl(*p++);
        p = (u_int32_t *)fc->speed_map;
        CSRARC(fc, SPED_MAP) = htonl(*p++);
        CSRARC(fc, SPED_MAP + 4) = htonl(*p++);
        /* don't byte-swap u_int8_t array */
        bcopy(p, &CSRARC(fc, SPED_MAP + 8), (fc->speed_map->crc_len - 1)*4);

        fc->max_hop = fc->max_node - i_branch;
        kprintf(", maxhop <= %d", fc->max_hop);
                
        if(fc->irm == -1 ){
                kprintf(", Not found IRM capable node");
        }else{
                kprintf(", cable IRM = %d", fc->irm);
                if (fc->irm == fc->nodeid)
                        kprintf(" (me)");
        }
        kprintf("\n");

        if (try_bmr && (fc->irm != -1) && (CSRARC(fc, BUS_MGR_ID) == 0x3f)) {
                if (fc->irm == fc->nodeid) {
                        fc->status = FWBUSMGRDONE;
                        CSRARC(fc, BUS_MGR_ID) = fc->set_bmr(fc, fc->irm);
                        fw_bmr(fc);
                } else {
                        fc->status = FWBUSMGRELECT;
                        callout_reset(&fc->bmr_callout, hz/8,
                                (void *)fw_try_bmr, (void *)fc);
                }
        } else
                fc->status = FWBUSMGRDONE;

        callout_reset(&fc->busprobe_callout, hz/4,
                        (void *)fw_bus_probe, (void *)fc);
}

/*
 * To probe devices on the IEEE1394 bus. 
 */
static void
fw_bus_probe(struct firewire_comm *fc)
{
        struct fw_device *fwdev;

        crit_enter();
        fc->status = FWBUSEXPLORE;
        fc->retry_count = 0;

        /* Invalidate all devices, just after bus reset. */
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (fwdev->status != FWDEVINVAL) {
                        fwdev->status = FWDEVINVAL;
                        fwdev->rcnt = 0;
                }

        fc->ongonode = 0;
        fc->ongoaddr = CSRROMOFF;
        fc->ongodev = NULL;
        fc->ongoeui.hi = 0xffffffff; fc->ongoeui.lo = 0xffffffff;
        fw_bus_explore(fc);
        crit_exit();
}

/*
 * To collect device informations on the IEEE1394 bus. 
 */
static void
fw_bus_explore(struct firewire_comm *fc )
{
        int err = 0;
        struct fw_device *fwdev, *pfwdev, *tfwdev;
        u_int32_t addr;
        struct fw_xfer *xfer;
        struct fw_pkt *fp;

        if(fc->status != FWBUSEXPLORE)
                return;

loop:
        if(fc->ongonode == fc->nodeid) fc->ongonode++;

        if(fc->ongonode > fc->max_node) goto done;
        if(fc->ongonode >= 0x3f) goto done;

        /* check link */
        /* XXX we need to check phy_id first */
        if (!fc->topology_map->self_id[fc->ongonode].p0.link_active) {
                if (firewire_debug)
                        kprintf("node%d: link down\n", fc->ongonode);
                fc->ongonode++;
                goto loop;
        }

        if(fc->ongoaddr <= CSRROMOFF &&
                fc->ongoeui.hi == 0xffffffff &&
                fc->ongoeui.lo == 0xffffffff ){
                fc->ongoaddr = CSRROMOFF;
                addr = 0xf0000000 | fc->ongoaddr;
        }else if(fc->ongoeui.hi == 0xffffffff ){
                fc->ongoaddr = CSRROMOFF + 0xc;
                addr = 0xf0000000 | fc->ongoaddr;
        }else if(fc->ongoeui.lo == 0xffffffff ){
                fc->ongoaddr = CSRROMOFF + 0x10;
                addr = 0xf0000000 | fc->ongoaddr;
        }else if(fc->ongodev == NULL){
                STAILQ_FOREACH(fwdev, &fc->devices, link)
                        if (FW_EUI64_EQUAL(fwdev->eui, fc->ongoeui))
                                break;
                if(fwdev != NULL){
                        fwdev->dst = fc->ongonode;
                        fwdev->status = FWDEVINIT;
                        fc->ongodev = fwdev;
                        fc->ongoaddr = CSRROMOFF;
                        addr = 0xf0000000 | fc->ongoaddr;
                        goto dorequest;
                }
                fwdev = kmalloc(sizeof(struct fw_device), M_FW,
                                M_WAITOK | M_ZERO);
                fwdev->fc = fc;
                fwdev->rommax = 0;
                fwdev->dst = fc->ongonode;
                fwdev->eui.hi = fc->ongoeui.hi; fwdev->eui.lo = fc->ongoeui.lo;
                fwdev->status = FWDEVINIT;
                fwdev->speed = fc->speed_map->speed[fc->nodeid][fc->ongonode];

                pfwdev = NULL;
                STAILQ_FOREACH(tfwdev, &fc->devices, link) {
                        if (tfwdev->eui.hi > fwdev->eui.hi ||
                                        (tfwdev->eui.hi == fwdev->eui.hi &&
                                        tfwdev->eui.lo > fwdev->eui.lo))
                                break;
                        pfwdev = tfwdev;
                }
                if (pfwdev == NULL)
                        STAILQ_INSERT_HEAD(&fc->devices, fwdev, link);
                else
                        STAILQ_INSERT_AFTER(&fc->devices, pfwdev, fwdev, link);

                device_printf(fc->bdev, "New %s device ID:%08x%08x\n",
                        linkspeed[fwdev->speed],
                        fc->ongoeui.hi, fc->ongoeui.lo);

                fc->ongodev = fwdev;
                fc->ongoaddr = CSRROMOFF;
                addr = 0xf0000000 | fc->ongoaddr;
        }else{
                addr = 0xf0000000 | fc->ongoaddr;
        }
dorequest:
#if 0
        xfer = asyreqq(fc, FWSPD_S100, 0, 0,
                ((FWLOCALBUS | fc->ongonode) << 16) | 0xffff , addr,
                fw_bus_explore_callback);
        if(xfer == NULL) goto done;
#else
        xfer = fw_xfer_alloc(M_FWXFER);
        if(xfer == NULL){
                goto done;
        }
        xfer->send.spd = 0;
        fp = &xfer->send.hdr;
        fp->mode.rreqq.dest_hi = 0xffff;
        fp->mode.rreqq.tlrt = 0;
        fp->mode.rreqq.tcode = FWTCODE_RREQQ;
        fp->mode.rreqq.pri = 0;
        fp->mode.rreqq.src = 0;
        fp->mode.rreqq.dst = FWLOCALBUS | fc->ongonode;
        fp->mode.rreqq.dest_lo = addr;
        xfer->act.hand = fw_bus_explore_callback;

        if (firewire_debug)
                kprintf("node%d: explore addr=0x%x\n",
                                fc->ongonode, fc->ongoaddr);
        err = fw_asyreq(fc, -1, xfer);
        if(err){
                fw_xfer_free( xfer);
                return;
        }
#endif
        return;
done:
        /* fw_attach_devs */
        fc->status = FWBUSEXPDONE;
        if (firewire_debug)
                kprintf("bus_explore done\n");
        fw_attach_dev(fc);
        return;

}

/* Portable Async. request read quad */
struct fw_xfer *
asyreqq(struct firewire_comm *fc, u_int8_t spd, u_int8_t tl, u_int8_t rt,
        u_int32_t addr_hi, u_int32_t addr_lo,
        void (*hand) (struct fw_xfer*))
{
        struct fw_xfer *xfer;
        struct fw_pkt *fp;
        int err;

        xfer = fw_xfer_alloc(M_FWXFER);
        if (xfer == NULL)
                return NULL;

        xfer->send.spd = spd; /* XXX:min(spd, fc->spd) */
        fp = &xfer->send.hdr;
        fp->mode.rreqq.dest_hi = addr_hi & 0xffff;
        if(tl & FWP_TL_VALID){
                fp->mode.rreqq.tlrt = (tl & 0x3f) << 2;
        }else{
                fp->mode.rreqq.tlrt = 0;
        }
        fp->mode.rreqq.tlrt |= rt & 0x3;
        fp->mode.rreqq.tcode = FWTCODE_RREQQ;
        fp->mode.rreqq.pri = 0;
        fp->mode.rreqq.src = 0;
        fp->mode.rreqq.dst = addr_hi >> 16;
        fp->mode.rreqq.dest_lo = addr_lo;
        xfer->act.hand = hand;

        err = fw_asyreq(fc, -1, xfer);
        if(err){
                fw_xfer_free( xfer);
                return NULL;
        }
        return xfer;
}

/*
 * Callback for the IEEE1394 bus information collection. 
 */
static void
fw_bus_explore_callback(struct fw_xfer *xfer)
{
        struct firewire_comm *fc;
        struct fw_pkt *sfp,*rfp;
        struct csrhdr *chdr;
        struct csrdir *csrd;
        struct csrreg *csrreg;
        u_int32_t offset;

        
        if(xfer == NULL) {
                kprintf("xfer == NULL\n");
                return;
        }
        fc = xfer->fc;

        if (firewire_debug)
                kprintf("node%d: callback addr=0x%x\n",
                        fc->ongonode, fc->ongoaddr);

        if(xfer->resp != 0){
                kprintf("node%d: resp=%d addr=0x%x\n",
                        fc->ongonode, xfer->resp, fc->ongoaddr);
                goto errnode;
        }

        sfp = &xfer->send.hdr;
        rfp = &xfer->recv.hdr;
#if 0
        {
                u_int32_t *qld;
                int i;
                qld = (u_int32_t *)xfer->recv.buf;
                kprintf("len:%d\n", xfer->recv.len);
                for( i = 0 ; i <= xfer->recv.len && i < 32; i+= 4){
                        kprintf("0x%08x ", rfp->mode.ld[i/4]);
                        if((i % 16) == 15) kprintf("\n");
                }
                if((i % 16) != 15) kprintf("\n");
        }
#endif
        if(fc->ongodev == NULL){
                if(sfp->mode.rreqq.dest_lo == (0xf0000000 | CSRROMOFF)){
                        rfp->mode.rresq.data = ntohl(rfp->mode.rresq.data);
                        chdr = (struct csrhdr *)(void *)(&rfp->mode.rresq.data);
/* If CSR is minimal confinguration, more investgation is not needed. */
                        if(chdr->info_len == 1){
                                if (firewire_debug)
                                        kprintf("node%d: minimal config\n",
                                                                fc->ongonode);
                                goto nextnode;
                        }else{
                                fc->ongoaddr = CSRROMOFF + 0xc;
                        }
                }else if(sfp->mode.rreqq.dest_lo == (0xf0000000 |(CSRROMOFF + 0xc))){
                        fc->ongoeui.hi = ntohl(rfp->mode.rresq.data);
                        fc->ongoaddr = CSRROMOFF + 0x10;
                }else if(sfp->mode.rreqq.dest_lo == (0xf0000000 |(CSRROMOFF + 0x10))){
                        fc->ongoeui.lo = ntohl(rfp->mode.rresq.data);
                        if (fc->ongoeui.hi == 0 && fc->ongoeui.lo == 0) {
                                if (firewire_debug)
                                        kprintf("node%d: eui64 is zero.\n",
                                                        fc->ongonode);
                                goto nextnode;
                        }
                        fc->ongoaddr = CSRROMOFF;
                }
        }else{
                if (fc->ongoaddr == CSRROMOFF &&
                    fc->ongodev->csrrom[0] == ntohl(rfp->mode.rresq.data)) {
                        fc->ongodev->status = FWDEVATTACHED;
                        goto nextnode;
                }
                fc->ongodev->csrrom[(fc->ongoaddr - CSRROMOFF)/4] = ntohl(rfp->mode.rresq.data);
                if(fc->ongoaddr > fc->ongodev->rommax){
                        fc->ongodev->rommax = fc->ongoaddr;
                }
                csrd = SLIST_FIRST(&fc->ongocsr);
                if((csrd = SLIST_FIRST(&fc->ongocsr)) == NULL){
                        chdr = (struct csrhdr *)(fc->ongodev->csrrom);
                        offset = CSRROMOFF;
                }else{
                        chdr = (struct csrhdr *)&fc->ongodev->csrrom[(csrd->off - CSRROMOFF)/4];
                        offset = csrd->off;
                }
                if(fc->ongoaddr > (CSRROMOFF + 0x14) && fc->ongoaddr != offset){
                        csrreg = (struct csrreg *)&fc->ongodev->csrrom[(fc->ongoaddr - CSRROMOFF)/4];
                        if( csrreg->key == 0x81 || csrreg->key == 0xd1){
                                csrd = SLIST_FIRST(&fc->csrfree);
                                if(csrd == NULL){
                                        goto nextnode;
                                }else{
                                        csrd->ongoaddr = fc->ongoaddr;
                                        fc->ongoaddr += csrreg->val * 4;
                                        csrd->off = fc->ongoaddr;
                                        SLIST_REMOVE_HEAD(&fc->csrfree, link);
                                        SLIST_INSERT_HEAD(&fc->ongocsr, csrd, link);
                                        goto nextaddr;
                                }
                        }
                }
                fc->ongoaddr += 4;
                if(((fc->ongoaddr - offset)/4 > chdr->crc_len) &&
                                (fc->ongodev->rommax < 0x414)){
                        if(fc->ongodev->rommax <= 0x414){
                                csrd = SLIST_FIRST(&fc->csrfree);
                                if(csrd == NULL) goto nextnode;
                                csrd->off = fc->ongoaddr;
                                csrd->ongoaddr = fc->ongoaddr;
                                SLIST_REMOVE_HEAD(&fc->csrfree, link);
                                SLIST_INSERT_HEAD(&fc->ongocsr, csrd, link);
                        }
                        goto nextaddr;
                }

                while(((fc->ongoaddr - offset)/4 > chdr->crc_len)){
                        if(csrd == NULL){
                                goto nextnode;
                        }
                        fc->ongoaddr = csrd->ongoaddr + 4;
                        SLIST_REMOVE_HEAD(&fc->ongocsr, link);
                        SLIST_INSERT_HEAD(&fc->csrfree, csrd, link);
                        csrd = SLIST_FIRST(&fc->ongocsr);
                        if((csrd = SLIST_FIRST(&fc->ongocsr)) == NULL){
                                chdr = (struct csrhdr *)(fc->ongodev->csrrom);
                                offset = CSRROMOFF;
                        }else{
                                chdr = (struct csrhdr *)&(fc->ongodev->csrrom[(csrd->off - CSRROMOFF)/4]);
                                offset = csrd->off;
                        }
                }
                if((fc->ongoaddr - CSRROMOFF) > CSRROMSIZE){
                        goto nextnode;
                }
        }
nextaddr:
        fw_xfer_free( xfer);
        fw_bus_explore(fc);
        return;
errnode:
        fc->retry_count++;
        if (fc->ongodev != NULL)
                fc->ongodev->status = FWDEVINVAL;
nextnode:
        fw_xfer_free( xfer);
        fc->ongonode++;
/* housekeeping work space */
        fc->ongoaddr = CSRROMOFF;
        fc->ongodev = NULL;
        fc->ongoeui.hi = 0xffffffff; fc->ongoeui.lo = 0xffffffff;
        while((csrd = SLIST_FIRST(&fc->ongocsr)) != NULL){
                SLIST_REMOVE_HEAD(&fc->ongocsr, link);
                SLIST_INSERT_HEAD(&fc->csrfree, csrd, link);
        }
        fw_bus_explore(fc);
        return;
}

/*
 * To attach sub-devices layer onto IEEE1394 bus.
 */
static void
fw_attach_dev(struct firewire_comm *fc)
{
        struct fw_device *fwdev, *next;
        int i, err;
        device_t *devlistp;
        int devcnt;
        struct firewire_dev_comm *fdc;

        for (fwdev = STAILQ_FIRST(&fc->devices); fwdev != NULL; fwdev = next) {
                next = STAILQ_NEXT(fwdev, link);
                if (fwdev->status == FWDEVINIT) {
                        fwdev->status = FWDEVATTACHED;
                } else if (fwdev->status == FWDEVINVAL) {
                        fwdev->rcnt ++;
                        if (fwdev->rcnt > hold_count) {
                                /*
                                 * Remove devices which have not been seen
                                 * for a while.
                                 */
                                STAILQ_REMOVE(&fc->devices, fwdev, fw_device,
                                    link);
                                kfree(fwdev, M_FW);
                        }
                }
        }

        err = device_get_children(fc->bdev, &devlistp, &devcnt);
        if( err != 0 )
                return;
        for( i = 0 ; i < devcnt ; i++){
                if (device_get_state(devlistp[i]) >= DS_ATTACHED)  {
                        fdc = device_get_softc(devlistp[i]);
                        if (fdc->post_explore != NULL)
                                fdc->post_explore(fdc);
                }
        }
        kfree(devlistp, M_TEMP);

        if (fc->retry_count > 0) {
                kprintf("probe failed for %d node\n", fc->retry_count);
#if 0
                callout_reset(&fc->retry_probe_callout, hz*2,
                                        (void *)fc->ibr, (void *)fc);
#endif
        }
        return;
}

/*
 * To allocate uniq transaction label.
 */
static int
fw_get_tlabel(struct firewire_comm *fc, struct fw_xfer *xfer)
{
        u_int i;
        struct tlabel *tl, *tmptl;
        static u_int32_t label = 0;

        crit_enter();
        for( i = 0 ; i < 0x40 ; i ++){
                label = (label + 1) & 0x3f;
                for(tmptl = STAILQ_FIRST(&fc->tlabels[label]);
                        tmptl != NULL; tmptl = STAILQ_NEXT(tmptl, link)){
                        if (tmptl->xfer->send.hdr.mode.hdr.dst ==
                            xfer->send.hdr.mode.hdr.dst)
                                break;
                }
                if(tmptl == NULL) {
                        tl = kmalloc(sizeof(struct tlabel), M_FW, M_WAITOK);
                        tl->xfer = xfer;
                        STAILQ_INSERT_TAIL(&fc->tlabels[label], tl, link);
                        crit_exit();
                        if (firewire_debug > 1)
                                kprintf("fw_get_tlabel: dst=%d tl=%d\n",
                                    xfer->send.hdr.mode.hdr.dst, label);
                        return(label);
                }
        }
        crit_exit();

        kprintf("fw_get_tlabel: no free tlabel\n");
        return(-1);
}

static void
fw_rcv_copy(struct fw_rcv_buf *rb)
{
        struct fw_pkt *pkt;
        u_char *p;
        struct tcode_info *tinfo;
        u_int res, i, len, plen;

        rb->xfer->recv.spd -= rb->spd;

        pkt = (struct fw_pkt *)rb->vec->iov_base;
        tinfo = &rb->fc->tcode[pkt->mode.hdr.tcode];

        /* Copy header */ 
        p = (u_char *)&rb->xfer->recv.hdr;
        bcopy(rb->vec->iov_base, p, tinfo->hdr_len);
        rb->vec->iov_base = (uint8_t *)rb->vec->iov_base + tinfo->hdr_len;
        rb->vec->iov_len -= tinfo->hdr_len;

        /* Copy payload */
        p = (u_char *)rb->xfer->recv.payload;
        res = rb->xfer->recv.pay_len;

        /* special handling for RRESQ */
        if (pkt->mode.hdr.tcode == FWTCODE_RRESQ &&
            p != NULL && res >= sizeof(u_int32_t)) {
                *(u_int32_t *)p = pkt->mode.rresq.data;
                rb->xfer->recv.pay_len = sizeof(u_int32_t);
                return;
        }

        if ((tinfo->flag & FWTI_BLOCK_ASY) == 0)
                return;

        plen = pkt->mode.rresb.len;

        for (i = 0; i < rb->nvec; i++, rb->vec++) {
                len = MIN(rb->vec->iov_len, plen);
                if (res < len) {
                        kprintf("rcv buffer(%d) is %d bytes short.\n",
                            rb->xfer->recv.pay_len, len - res);
                        len = res;
                }
                bcopy(rb->vec->iov_base, p, len);
                p += len;
                res -= len;
                plen -= len;
                if (res == 0 || plen == 0)
                        break;
        }
        rb->xfer->recv.pay_len -= res;

}

/*
 * Generic packet receving process.
 */
void
fw_rcv(struct fw_rcv_buf *rb)
{
        struct fw_pkt *fp, *resfp;
        struct fw_bind *bind;
        int tcode;
        int i, len, oldstate;
#if 0
        {
                u_int32_t *qld;
                int i;
                qld = (u_int32_t *)buf;
                kprintf("spd %d len:%d\n", spd, len);
                for( i = 0 ; i <= len && i < 32; i+= 4){
                        kprintf("0x%08x ", ntohl(qld[i/4]));
                        if((i % 16) == 15) kprintf("\n");
                }
                if((i % 16) != 15) kprintf("\n");
        }
#endif
        fp = (struct fw_pkt *)rb->vec[0].iov_base;
        tcode = fp->mode.common.tcode;
        switch (tcode) {
        case FWTCODE_WRES:
        case FWTCODE_RRESQ:
        case FWTCODE_RRESB:
        case FWTCODE_LRES:
                rb->xfer = fw_tl2xfer(rb->fc, fp->mode.hdr.src,
                                        fp->mode.hdr.tlrt >> 2);
                if(rb->xfer == NULL) {
                        kprintf("fw_rcv: unknown response "
                            "%s(%x) src=0x%x tl=0x%x rt=%d data=0x%x\n",
                            tcode_str[tcode], tcode,
                            fp->mode.hdr.src,
                            fp->mode.hdr.tlrt >> 2,
                            fp->mode.hdr.tlrt & 3,
                            fp->mode.rresq.data);
#if 1
                        kprintf("try ad-hoc work around!!\n");
                        rb->xfer = fw_tl2xfer(rb->fc, fp->mode.hdr.src,
                                        (fp->mode.hdr.tlrt >> 2)^3);
                        if (rb->xfer == NULL) {
                                kprintf("no use...\n");
                                goto err;
                        }
#else
                        goto err;
#endif
                }
                fw_rcv_copy(rb);
                if (rb->xfer->recv.hdr.mode.wres.rtcode != RESP_CMP)
                        rb->xfer->resp = EIO;
                else
                        rb->xfer->resp = 0;
                /* make sure the packet is drained in AT queue */
                oldstate = rb->xfer->state;
                rb->xfer->state = FWXF_RCVD;
                switch (oldstate) {
                case FWXF_SENT:
                        fw_xfer_done(rb->xfer);
                        break;
                case FWXF_START:
#if 0
                        if (firewire_debug)
                                kprintf("not sent yet tl=%x\n", rb->xfer->tl);
#endif
                        break;
                default:
                        kprintf("unexpected state %d\n", rb->xfer->state);
                }
                return;
        case FWTCODE_WREQQ:
        case FWTCODE_WREQB:
        case FWTCODE_RREQQ:
        case FWTCODE_RREQB:
        case FWTCODE_LREQ:
                bind = fw_bindlookup(rb->fc, fp->mode.rreqq.dest_hi,
                        fp->mode.rreqq.dest_lo);
                if(bind == NULL){
                        kprintf("Unknown service addr 0x%04x:0x%08x %s(%x)"
                            " src=0x%x data=%x\n",
                            fp->mode.wreqq.dest_hi, fp->mode.wreqq.dest_lo,
                            tcode_str[tcode], tcode,
                            fp->mode.hdr.src, ntohl(fp->mode.wreqq.data));
                        if (rb->fc->status == FWBUSRESET) {
                                kprintf("fw_rcv: cannot respond(bus reset)!\n");
                                goto err;
                        }
                        rb->xfer = fw_xfer_alloc(M_FWXFER);
                        if(rb->xfer == NULL){
                                return;
                        }
                        rb->xfer->send.spd = rb->spd;
                        rb->xfer->send.pay_len = 0;
                        resfp = &rb->xfer->send.hdr;
                        switch (tcode) {
                        case FWTCODE_WREQQ:
                        case FWTCODE_WREQB:
                                resfp->mode.hdr.tcode = FWTCODE_WRES;
                                break;
                        case FWTCODE_RREQQ:
                                resfp->mode.hdr.tcode = FWTCODE_RRESQ;
                                break;
                        case FWTCODE_RREQB:
                                resfp->mode.hdr.tcode = FWTCODE_RRESB;
                                break;
                        case FWTCODE_LREQ:
                                resfp->mode.hdr.tcode = FWTCODE_LRES;
                                break;
                        }
                        resfp->mode.hdr.dst = fp->mode.hdr.src;
                        resfp->mode.hdr.tlrt = fp->mode.hdr.tlrt;
                        resfp->mode.hdr.pri = fp->mode.hdr.pri;
                        resfp->mode.rresb.rtcode = RESP_ADDRESS_ERROR;
                        resfp->mode.rresb.extcode = 0;
                        resfp->mode.rresb.len = 0;
/*
                        rb->xfer->act.hand = fw_asy_callback;
*/
                        rb->xfer->act.hand = fw_xfer_free;
                        if(fw_asyreq(rb->fc, -1, rb->xfer)){
                                fw_xfer_free(rb->xfer);
                                return;
                        }
                        goto err;
                }
                len = 0;
                for (i = 0; i < rb->nvec; i ++)
                        len += rb->vec[i].iov_len;
                switch(bind->act_type){
                case FWACT_XFER:
                        crit_enter();
                        rb->xfer = STAILQ_FIRST(&bind->xferlist);
                        if (rb->xfer == NULL) {
                                kprintf("Discard a packet for this bind.\n");
                                crit_exit();
                                goto err;
                        }
                        STAILQ_REMOVE_HEAD(&bind->xferlist, link);
                        crit_exit();
                        fw_rcv_copy(rb);
                        rb->xfer->act.hand(rb->xfer);
                        return;
                        break;
                case FWACT_CH:
                        if(rb->fc->ir[bind->sub]->queued >=
                                rb->fc->ir[bind->sub]->maxq){
                                device_printf(rb->fc->bdev,
                                        "Discard a packet %x %d\n",
                                        bind->sub,
                                        rb->fc->ir[bind->sub]->queued);
                                goto err;
                        }
                        crit_enter();
                        rb->xfer = STAILQ_FIRST(&bind->xferlist);
                        if (rb->xfer == NULL) {
                                kprintf("Discard packet for this bind\n");
                                crit_exit();
                                goto err;
                        }
                        STAILQ_REMOVE_HEAD(&bind->xferlist, link);
                        crit_exit();
                        fw_rcv_copy(rb);
                        crit_enter();
                        rb->fc->ir[bind->sub]->queued++;
                        STAILQ_INSERT_TAIL(&rb->fc->ir[bind->sub]->q,
                            rb->xfer, link);
                        crit_exit();

                        wakeup((caddr_t)rb->fc->ir[bind->sub]);

                        return;
                        break;
                default:
                        goto err;
                        break;
                }
                break;
#if 0 /* shouldn't happen ?? or for GASP */
        case FWTCODE_STREAM:
        {
                struct fw_xferq *xferq;

                xferq = rb->fc->ir[sub];
#if 0
                kprintf("stream rcv dma %d len %d off %d spd %d\n",
                        sub, len, off, spd);
#endif
                if(xferq->queued >= xferq->maxq) {
                        kprintf("receive queue is full\n");
                        goto err;
                }
                /* XXX get xfer from xfer queue, we don't need copy for 
                        per packet mode */
                rb->xfer = fw_xfer_alloc_buf(M_FWXFER, 0, /* XXX */
                                                vec[0].iov_len);
                if (rb->xfer == NULL) goto err;
                fw_rcv_copy(rb)
                crit_enter();
                xferq->queued++;
                STAILQ_INSERT_TAIL(&xferq->q, rb->xfer, link);
                crit_exit();
                sc = device_get_softc(rb->fc->bdev);
                KNOTE(&xferq->rkq.ki_note, 0);
                if (xferq->flag & FWXFERQ_WAKEUP) {
                        xferq->flag &= ~FWXFERQ_WAKEUP;
                        wakeup((caddr_t)xferq);
                }
                if (xferq->flag & FWXFERQ_HANDLER) {
                        xferq->hand(xferq);
                }
                return;
                break;
        }
#endif
        default:
                kprintf("fw_rcv: unknown tcode %d\n", tcode);
                break;
        }
err:
        return;
}

/*
 * Post process for Bus Manager election process.
 */
static void
fw_try_bmr_callback(struct fw_xfer *xfer)
{
        struct firewire_comm *fc;
        int bmr;

        if (xfer == NULL)
                return;
        fc = xfer->fc;
        if (xfer->resp != 0)
                goto error;
        if (xfer->recv.payload == NULL)
                goto error;
        if (xfer->recv.hdr.mode.lres.rtcode != FWRCODE_COMPLETE)
                goto error;

        bmr = ntohl(xfer->recv.payload[0]);
        if (bmr == 0x3f)
                bmr = fc->nodeid;

        CSRARC(fc, BUS_MGR_ID) = fc->set_bmr(fc, bmr & 0x3f);
        fw_xfer_free_buf(xfer);
        fw_bmr(fc);
        return;

error:
        device_printf(fc->bdev, "bus manager election failed\n");
        fw_xfer_free_buf(xfer);
}


/*
 * To candidate Bus Manager election process.
 */
static void
fw_try_bmr(void *arg)
{
        struct fw_xfer *xfer;
        struct firewire_comm *fc = (struct firewire_comm *)arg;
        struct fw_pkt *fp;
        int err = 0;

        xfer = fw_xfer_alloc_buf(M_FWXFER, 8, 4);
        if(xfer == NULL){
                return;
        }
        xfer->send.spd = 0;
        fc->status = FWBUSMGRELECT;

        fp = &xfer->send.hdr;
        fp->mode.lreq.dest_hi = 0xffff;
        fp->mode.lreq.tlrt = 0;
        fp->mode.lreq.tcode = FWTCODE_LREQ;
        fp->mode.lreq.pri = 0;
        fp->mode.lreq.src = 0;
        fp->mode.lreq.len = 8;
        fp->mode.lreq.extcode = EXTCODE_CMP_SWAP;
        fp->mode.lreq.dst = FWLOCALBUS | fc->irm;
        fp->mode.lreq.dest_lo = 0xf0000000 | BUS_MGR_ID;
        xfer->send.payload[0] = htonl(0x3f);
        xfer->send.payload[1] = htonl(fc->nodeid);
        xfer->act.hand = fw_try_bmr_callback;

        err = fw_asyreq(fc, -1, xfer);
        if(err){
                fw_xfer_free_buf(xfer);
                return;
        }
        return;
}

#ifdef FW_VMACCESS
/*
 * Software implementation for physical memory block access.
 * XXX:Too slow, usef for debug purpose only.
 */
static void
fw_vmaccess(struct fw_xfer *xfer){
        struct fw_pkt *rfp, *sfp = NULL;
        u_int32_t *ld = (u_int32_t *)xfer->recv.buf;

        kprintf("vmaccess spd:%2x len:%03x data:%08x %08x %08x %08x\n",
                        xfer->spd, xfer->recv.len, ntohl(ld[0]), ntohl(ld[1]), ntohl(ld[2]), ntohl(ld[3]));
        kprintf("vmaccess          data:%08x %08x %08x %08x\n", ntohl(ld[4]), ntohl(ld[5]), ntohl(ld[6]), ntohl(ld[7]));
        if(xfer->resp != 0){
                fw_xfer_free( xfer);
                return;
        }
        if(xfer->recv.buf == NULL){
                fw_xfer_free( xfer);
                return;
        }
        rfp = (struct fw_pkt *)xfer->recv.buf;
        switch(rfp->mode.hdr.tcode){
                /* XXX need fix for 64bit arch */
                case FWTCODE_WREQB:
                        xfer->send.buf = kmalloc(12, M_FW, M_WAITOK);
                        xfer->send.len = 12;
                        sfp = (struct fw_pkt *)xfer->send.buf;
                        bcopy(rfp->mode.wreqb.payload,
                                (caddr_t)ntohl(rfp->mode.wreqb.dest_lo), ntohs(rfp->mode.wreqb.len));
                        sfp->mode.wres.tcode = FWTCODE_WRES;
                        sfp->mode.wres.rtcode = 0;
                        break;
                case FWTCODE_WREQQ:
                        xfer->send.buf = kmalloc(12, M_FW, M_WAITOK);
                        xfer->send.len = 12;
                        sfp->mode.wres.tcode = FWTCODE_WRES;
                        *((u_int32_t *)(ntohl(rfp->mode.wreqb.dest_lo))) = rfp->mode.wreqq.data;
                        sfp->mode.wres.rtcode = 0;
                        break;
                case FWTCODE_RREQB:
                        xfer->send.buf = kmalloc(16 + rfp->mode.rreqb.len, M_FW, M_WAITOK);
                        xfer->send.len = 16 + ntohs(rfp->mode.rreqb.len);
                        sfp = (struct fw_pkt *)xfer->send.buf;
                        bcopy((caddr_t)ntohl(rfp->mode.rreqb.dest_lo),
                                sfp->mode.rresb.payload, (u_int16_t)ntohs(rfp->mode.rreqb.len));
                        sfp->mode.rresb.tcode = FWTCODE_RRESB;
                        sfp->mode.rresb.len = rfp->mode.rreqb.len;
                        sfp->mode.rresb.rtcode = 0;
                        sfp->mode.rresb.extcode = 0;
                        break;
                case FWTCODE_RREQQ:
                        xfer->send.buf = kmalloc(16, M_FW, M_WAITOK);
                        xfer->send.len = 16;
                        sfp = (struct fw_pkt *)xfer->send.buf;
                        sfp->mode.rresq.data = *(u_int32_t *)(ntohl(rfp->mode.rreqq.dest_lo));
                        sfp->mode.wres.tcode = FWTCODE_RRESQ;
                        sfp->mode.rresb.rtcode = 0;
                        break;
                default:
                        fw_xfer_free( xfer);
                        return;
        }
        sfp->mode.hdr.dst = rfp->mode.hdr.src;
        xfer->dst = ntohs(rfp->mode.hdr.src);
        xfer->act.hand = fw_xfer_free;
        xfer->retry_req = fw_asybusy;

        sfp->mode.hdr.tlrt = rfp->mode.hdr.tlrt;
        sfp->mode.hdr.pri = 0;

        fw_asyreq(xfer->fc, -1, xfer);
/**/
        return;
}
#endif 

/*
 * CRC16 check-sum for IEEE1394 register blocks.
 */
u_int16_t
fw_crc16(u_int32_t *ptr, u_int32_t len){
        u_int32_t i, sum, crc = 0;
        int shift;
        len = (len + 3) & ~3;
        for(i = 0 ; i < len ; i+= 4){
                for( shift = 28 ; shift >= 0 ; shift -= 4){
                        sum = ((crc >> 12) ^ (ptr[i/4] >> shift)) & 0xf;
                        crc = (crc << 4) ^ ( sum << 12 ) ^ ( sum << 5) ^ sum;
                }
                crc &= 0xffff;
        }
        return((u_int16_t) crc);
}

static int
fw_bmr(struct firewire_comm *fc)
{
        struct fw_device fwdev;
        union fw_self_id *self_id;
        int cmstr;
        u_int32_t quad;

        /* Check to see if the current root node is cycle master capable */
        self_id = &fc->topology_map->self_id[fc->max_node];
        if (fc->max_node > 0) {
                /* XXX check cmc bit of businfo block rather than contender */
                if (self_id->p0.link_active && self_id->p0.contender)
                        cmstr = fc->max_node;
                else {
                        device_printf(fc->bdev,
                                "root node is not cycle master capable\n");
                        /* XXX shall we be the cycle master? */
                        cmstr = fc->nodeid;
                        /* XXX need bus reset */
                }
        } else
                cmstr = -1;

        device_printf(fc->bdev, "bus manager %d ", CSRARC(fc, BUS_MGR_ID));
        if(CSRARC(fc, BUS_MGR_ID) != fc->nodeid) {
                /* We are not the bus manager */
                kprintf("\n");
                return(0);
        }
        kprintf("(me)\n");

        /* Optimize gapcount */
        if(fc->max_hop <= MAX_GAPHOP )
                fw_phy_config(fc, cmstr, gap_cnt[fc->max_hop]);
        /* If we are the cycle master, nothing to do */
        if (cmstr == fc->nodeid || cmstr == -1)
                return 0;
        /* Bus probe has not finished, make dummy fwdev for cmstr */
        bzero(&fwdev, sizeof(fwdev));
        fwdev.fc = fc;
        fwdev.dst = cmstr;
        fwdev.speed = 0;
        fwdev.maxrec = 8; /* 512 */
        fwdev.status = FWDEVINIT;
        /* Set cmstr bit on the cycle master */
        quad = htonl(1 << 8);
        fwmem_write_quad(&fwdev, NULL, 0/*spd*/,
                0xffff, 0xf0000000 | STATE_SET, &quad, fw_asy_callback_free);

        return 0;
}

static int
fw_modevent(module_t mode, int type, void *data)
{
        int err = 0;
#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
        static eventhandler_tag fwdev_ehtag = NULL;
#endif

        switch (type) {
        case MOD_LOAD:
#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
                fwdev_ehtag = EVENTHANDLER_REGISTER(dev_clone,
                                                fwdev_clone, 0, 1000);
#endif
                break;
        case MOD_UNLOAD:
#if defined(__FreeBSD__) && __FreeBSD_version >= 500000
                if (fwdev_ehtag != NULL)
                        EVENTHANDLER_DEREGISTER(dev_clone, fwdev_ehtag);
#endif
                break;
        case MOD_SHUTDOWN:
                break;
        }
        return (err);
}

/*
 * This causes the firewire identify to be called for any attached fwohci
 * device in the system.
 */
DECLARE_DUMMY_MODULE(firewire);
DRIVER_MODULE(firewire,fwohci,firewire_driver,firewire_devclass,fw_modevent,NULL);
MODULE_VERSION(firewire, 1);