/*      $NetBSD: firewire.c,v 1.55 2022/05/22 11:27:35 andvar 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/firewire.c,v 1.110 2009/04/07 02:33:46 sbruno Exp $
 *
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: firewire.c,v 1.55 2022/05/22 11:27:35 andvar Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/callout.h>
#include <sys/condvar.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/systm.h>

#include <dev/ieee1394/firewire.h>
#include <dev/ieee1394/firewirereg.h>
#include <dev/ieee1394/fwmem.h>
#include <dev/ieee1394/iec13213.h>
#include <dev/ieee1394/iec68113.h>

#include "locators.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 = 0;
/*
 * Setup sysctl(3) MIB, hw.ieee1394if.*
 *
 * TBD condition CTLFLAG_PERMANENT on being a module or not
 */
SYSCTL_SETUP(sysctl_ieee1394if, "sysctl ieee1394if(4) subtree setup")
{
        int rc, ieee1394if_node_num;
        const struct sysctlnode *node;

        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT, CTLTYPE_NODE, "ieee1394if",
            SYSCTL_DESCR("ieee1394if controls"),
            NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }
        ieee1394if_node_num = node->sysctl_num;

        /* ieee1394if try bus manager flag */
        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
            "try_bmr", SYSCTL_DESCR("Try to be a bus manager"),
            NULL, 0, &try_bmr,
            0, CTL_HW, ieee1394if_node_num, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }

        /* ieee1394if hold count */
        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
            "hold_count", SYSCTL_DESCR("Number of count of "
            "bus resets for removing lost device information"),
            NULL, 0, &hold_count,
            0, CTL_HW, ieee1394if_node_num, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }

        /* ieee1394if driver debug flag */
        if ((rc = sysctl_createv(clog, 0, NULL, &node,
            CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
            "ieee1394_debug", SYSCTL_DESCR("ieee1394if driver debug flag"),
            NULL, 0, &firewire_debug,
            0, CTL_HW, ieee1394if_node_num, CTL_CREATE, CTL_EOL)) != 0) {
                goto err;
        }

        return;

err:
        aprint_error("%s: sysctl_createv failed (rc = %d)\n", __func__, rc);
}

MALLOC_DEFINE(M_FW, "ieee1394", "IEEE1394");

#define FW_MAXASYRTY 4

#define FW_GENERATION_CHANGEABLE        2

static int firewirematch (device_t, cfdata_t, void *);
static void firewireattach (device_t, device_t, void *);
static int firewiredetach (device_t, int);
static int firewire_print (void *, const char *);

int firewire_resume (struct firewire_comm *);

static void fw_asystart(struct fw_xfer *);
static void firewire_xfer_timeout(struct firewire_comm *);
static void firewire_watchdog(void *);
static void fw_xferq_drain(struct fw_xferq *);
static void fw_reset_csr(struct firewire_comm *);
static void fw_init_crom(struct firewire_comm *);
static void fw_reset_crom(struct firewire_comm *);
static void fw_dump_hdr(struct fw_pkt *, const char *);
static void fw_tl_free(struct firewire_comm *, struct fw_xfer *);
static struct fw_xfer *fw_tl2xfer(struct firewire_comm *, int, int, int);
static void fw_phy_config(struct firewire_comm *, int, int);
static void fw_print_sid(uint32_t);
static void fw_bus_probe(struct firewire_comm *);
static int fw_explore_read_quads(struct fw_device *, int, uint32_t *, int);
static int fw_explore_csrblock(struct fw_device *, int, int);
static int fw_explore_node(struct fw_device *);
static union fw_self_id *fw_find_self_id(struct firewire_comm *, int);
static void fw_explore(struct firewire_comm *);
static void fw_bus_probe_thread(void *);
static void fw_attach_dev(struct firewire_comm *);
static int fw_get_tlabel(struct firewire_comm *, struct fw_xfer *);
static void fw_rcv_copy(struct fw_rcv_buf *);
static void fw_try_bmr_callback(struct fw_xfer *);
static void fw_try_bmr(void *);
static int fw_bmr(struct firewire_comm *);


CFATTACH_DECL_NEW(ieee1394if, sizeof(struct firewire_softc),
    firewirematch, firewireattach, firewiredetach, NULL);


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

static const 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 int
firewirematch(device_t parent, cfdata_t cf, void *aux)
{

        return 1;       /* always match */
}

static void
firewireattach(device_t parent, device_t self, void *aux)
{
        struct firewire_softc *sc = device_private(self);
        struct firewire_comm *fc = device_private(parent);
        struct fw_attach_args faa;
        struct firewire_dev_list *devlist;

        aprint_naive("\n");
        aprint_normal(": IEEE1394 bus\n");

        fc->bdev = sc->dev = self;
        sc->fc = fc;
        SLIST_INIT(&sc->devlist);

        fc->status = FWBUSNOTREADY;

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

        fc->crom_src_buf = malloc(sizeof(struct crom_src_buf),
            M_FW, M_WAITOK | M_ZERO);
        fc->topology_map =malloc(sizeof(struct fw_topology_map),
            M_FW, M_WAITOK | M_ZERO);
        fc->speed_map = malloc(sizeof(struct fw_speed_map),
            M_FW, M_WAITOK | M_ZERO);

        mutex_init(&fc->tlabel_lock, MUTEX_DEFAULT, IPL_VM);
        mutex_init(&fc->fc_mtx, MUTEX_DEFAULT, IPL_VM);
        mutex_init(&fc->wait_lock, MUTEX_DEFAULT, IPL_VM);
        cv_init(&fc->fc_cv, "ieee1394");

        callout_init(&fc->timeout_callout, CALLOUT_MPSAFE);
        callout_setfunc(&fc->timeout_callout, firewire_watchdog, fc);
        callout_init(&fc->bmr_callout, CALLOUT_MPSAFE);
        callout_setfunc(&fc->bmr_callout, fw_try_bmr, fc);
        callout_init(&fc->busprobe_callout, CALLOUT_MPSAFE);
        callout_setfunc(&fc->busprobe_callout, (void *)fw_bus_probe, fc);

        callout_schedule(&fc->timeout_callout, hz);

        /* Tell config we will have started a thread to scan the bus.  */
        config_pending_incr(self);

        /* create thread */
        if (kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, fw_bus_probe_thread,
            fc, &fc->probe_thread, "fw%dprobe", device_unit(fc->bdev))) {
                aprint_error_dev(self, "kthread_create failed\n");
                config_pending_decr(self);
        }

        devlist = malloc(sizeof(struct firewire_dev_list), M_DEVBUF, M_WAITOK);

        faa.name = "fwip";
        faa.fc = fc;
        faa.fwdev = NULL;
        devlist->dev = config_found(sc->dev, &faa, firewire_print, CFARGS_NONE);
        if (devlist->dev == NULL)
                free(devlist, M_DEVBUF);
        else
                SLIST_INSERT_HEAD(&sc->devlist, devlist, link);

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

        if (!pmf_device_register(self, NULL, NULL))
                aprint_error_dev(self, "couldn't establish power handler\n");

        return;
}

static int
firewiredetach(device_t self, int flags)
{
        struct firewire_softc *sc = device_private(self);
        struct firewire_comm *fc;
        struct fw_device *fwdev, *fwdev_next;
        struct firewire_dev_list *devlist;
        int err;

        fc = sc->fc;
        mutex_enter(&fc->wait_lock);
        fc->status = FWBUSDETACH;
        cv_signal(&fc->fc_cv);
        while (fc->status != FWBUSDETACHOK) {
                err = cv_timedwait_sig(&fc->fc_cv, &fc->wait_lock, hz * 60);
                if (err == EWOULDBLOCK) {
                        aprint_error_dev(self,
                            "firewire probe thread didn't die\n");
                        break;
                }
        }
        mutex_exit(&fc->wait_lock);


        while ((devlist = SLIST_FIRST(&sc->devlist)) != NULL) {
                if ((err = config_detach(devlist->dev, flags)) != 0)
                        return err;
                SLIST_REMOVE(&sc->devlist, devlist, firewire_dev_list, link);
                free(devlist, M_DEVBUF);
        }

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

        /* XXX xfer_free and untimeout on all xfers */
        for (fwdev = STAILQ_FIRST(&fc->devices); fwdev != NULL;
            fwdev = fwdev_next) {
                fwdev_next = STAILQ_NEXT(fwdev, link);
                free(fwdev, M_FW);
        }
        free(fc->topology_map, M_FW);
        free(fc->speed_map, M_FW);
        free(fc->crom_src_buf, M_FW);

        cv_destroy(&fc->fc_cv);
        mutex_destroy(&fc->wait_lock);
        mutex_destroy(&fc->fc_mtx);
        mutex_destroy(&fc->tlabel_lock);
        return 0;
}

static int
firewire_print(void *aux, const char *pnp)
{
        struct fw_attach_args *fwa = (struct fw_attach_args *)aux;

        if (pnp)
                aprint_normal("%s at %s", fwa->name, pnp);

        return UNCONF;
}

int
firewire_resume(struct firewire_comm *fc)
{

        fc->status = FWBUSNOTREADY;
        return 0;
}


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

        mutex_enter(&fc->fc_mtx);
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (fwdev->dst == dst && fwdev->status != FWDEVINVAL)
                        break;
        mutex_exit(&fc->fc_mtx);

        return fwdev;
}

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

        mutex_enter(&fc->fc_mtx);
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (FW_EUI64_EQUAL(fwdev->eui, *eui))
                        break;
        mutex_exit(&fc->fc_mtx);

        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)
{
        struct fw_xferq *xferq;
        int len;
        struct fw_pkt *fp;
        int tcode;
        const struct tcode_info *info;

        if (xfer == NULL)
                return EINVAL;
        if (xfer->hand == NULL) {
                aprint_error_dev(fc->bdev, "hand == NULL\n");
                return EINVAL;
        }
        fp = &xfer->send.hdr;

        tcode = fp->mode.common.tcode & 0xf;
        info = &fc->tcode[tcode];
        if (info->flag == 0) {
                aprint_error_dev(fc->bdev, "invalid tcode=%x\n", tcode);
                return EINVAL;
        }

        /* XXX allow bus explore packets only after bus rest */
        if ((fc->status < FWBUSEXPLORE) &&
            ((tcode != FWTCODE_RREQQ) || (fp->mode.rreqq.dest_hi != 0xffff) ||
            (fp->mode.rreqq.dest_lo < 0xf0000000) ||
            (fp->mode.rreqq.dest_lo >= 0xf0001000))) {
                xfer->resp = EAGAIN;
                xfer->flag = FWXF_BUSY;
                return EAGAIN;
        }

        if (info->flag & FWTI_REQ)
                xferq = fc->atq;
        else
                xferq = fc->ats;
        len = info->hdr_len;
        if (xfer->send.pay_len > MAXREC(fc->maxrec)) {
                aprint_error_dev(fc->bdev, "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) {
                aprint_error_dev(fc->bdev,
                    "len(%d) != send.pay_len(%d) %s(%x)\n",
                    len, xfer->send.pay_len, tcode_str[tcode], tcode);
                return EINVAL;
        }

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

        xfer->tl = -1;
        if (info->flag & FWTI_TLABEL)
                if (fw_get_tlabel(fc, xfer) < 0)
                        return EAGAIN;

        xfer->resp = 0;
        xfer->fc = fc;
        xfer->q = xferq;

        fw_asystart(xfer);
        return 0;
}

/*
 * Wakeup blocked process.
 */
void
fw_xferwake(struct fw_xfer *xfer)
{

        mutex_enter(&xfer->fc->wait_lock);
        xfer->flag |= FWXF_WAKE;
        cv_signal(&xfer->cv);
        mutex_exit(&xfer->fc->wait_lock);

        return;
}

int
fw_xferwait(struct fw_xfer *xfer)
{
        struct firewire_comm *fc = xfer->fc;
        int err = 0;

        mutex_enter(&fc->wait_lock);
        while (!(xfer->flag & FWXF_WAKE))
                err = cv_wait_sig(&xfer->cv, &fc->wait_lock);
        mutex_exit(&fc->wait_lock);

        return err;
}

void
fw_drain_txq(struct firewire_comm *fc)
{
        struct fw_xfer *xfer;
        STAILQ_HEAD(, fw_xfer) xfer_drain;
        int i;

        STAILQ_INIT(&xfer_drain);

        mutex_enter(&fc->atq->q_mtx);
        fw_xferq_drain(fc->atq);
        mutex_exit(&fc->atq->q_mtx);
        mutex_enter(&fc->ats->q_mtx);
        fw_xferq_drain(fc->ats);
        mutex_exit(&fc->ats->q_mtx);
        for (i = 0; i < fc->nisodma; i++)
                fw_xferq_drain(fc->it[i]);

        mutex_enter(&fc->tlabel_lock);
        for (i = 0; i < 0x40; i++)
                while ((xfer = STAILQ_FIRST(&fc->tlabels[i])) != NULL) {
                        if (firewire_debug)
                                printf("tl=%d flag=%d\n", i, xfer->flag);
                        xfer->resp = EAGAIN;
                        STAILQ_REMOVE_HEAD(&fc->tlabels[i], tlabel);
                        STAILQ_INSERT_TAIL(&xfer_drain, xfer, tlabel);
                }
        mutex_exit(&fc->tlabel_lock);

        STAILQ_FOREACH(xfer, &xfer_drain, tlabel)
                xfer->hand(xfer);
}

/*
 * Called after bus reset.
 */
void
fw_busreset(struct firewire_comm *fc, uint32_t new_status)
{
        struct firewire_softc *sc = device_private(fc->bdev);
        struct firewire_dev_list *devlist;
        struct firewire_dev_comm *fdc;
        struct crom_src *src;
        uint32_t *newrom;

        if (fc->status == FWBUSMGRELECT)
                callout_stop(&fc->bmr_callout);

        fc->status = new_status;
        fw_reset_csr(fc);

        if (fc->status == FWBUSNOTREADY)
                fw_init_crom(fc);

        fw_reset_crom(fc);

        /* How many safe this access? */
        SLIST_FOREACH(devlist, &sc->devlist, link) {
                fdc = device_private(devlist->dev);
                if (fdc->post_busreset != NULL)
                        fdc->post_busreset(fdc);
        }

        /*
         * If the old config rom needs to be overwritten,
         * bump the businfo.generation indicator to
         * indicate that we need to be reprobed
         * See 1394a-2000 8.3.2.5.4 for more details.
         * generation starts at 2 and rolls over at 0xF
         * back to 2.
         *
         * A generation of 0 indicates a device
         * that is not 1394a-2000 compliant.
         * A generation of 1 indicates a device that
         * does not change its Bus Info Block or
         * Configuration ROM.
         */
#define FW_MAX_GENERATION       0xF
        newrom = malloc(CROMSIZE, M_FW, M_NOWAIT | M_ZERO);
        src = &fc->crom_src_buf->src;
        crom_load(src, newrom, CROMSIZE);
        if (memcmp(newrom, fc->config_rom, CROMSIZE) != 0) {
                if (src->businfo.generation++ > FW_MAX_GENERATION)
                        src->businfo.generation = FW_GENERATION_CHANGEABLE;
                memcpy((void *)fc->config_rom, newrom, CROMSIZE);
        }
        free(newrom, M_FW);
}

/* Call once after reboot */
void
fw_init(struct firewire_comm *fc)
{
        int i;

        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);
        mutex_init(&fc->arq->q_mtx, MUTEX_DEFAULT, IPL_VM);
        mutex_init(&fc->ars->q_mtx, MUTEX_DEFAULT, IPL_VM);
        mutex_init(&fc->atq->q_mtx, MUTEX_DEFAULT, IPL_VM);
        mutex_init(&fc->ats->q_mtx, MUTEX_DEFAULT, IPL_VM);

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

        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 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;
}

/*
 * Called by HCI driver when it has determined the number of
 * isochronous DMA channels.
 */
void
fw_init_isodma(struct firewire_comm *fc)
{
        unsigned i;

        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);

                fc->ir[i]->maxq = FWMAXQUEUE;
                fc->it[i]->maxq = FWMAXQUEUE;

                cv_init(&fc->ir[i]->cv, "fw_read");
                cv_init(&fc->it[i]->cv, "fw_write");
        }
}

void
fw_destroy_isodma(struct firewire_comm *fc)
{
        unsigned i;

        for (i = 0; i < fc->nisodma; i++) {
                cv_destroy(&fc->ir[i]->cv);
                cv_destroy(&fc->it[i]->cv);
        }
}

void
fw_destroy(struct firewire_comm *fc)
{
        mutex_destroy(&fc->arq->q_mtx);
        mutex_destroy(&fc->ars->q_mtx);
        mutex_destroy(&fc->atq->q_mtx);
        mutex_destroy(&fc->ats->q_mtx);
}

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

/*
 * To lookup bound process from IEEE1394 address.
 */
struct fw_bind *
fw_bindlookup(struct firewire_comm *fc, uint16_t dest_hi, uint32_t dest_lo)
{
        u_int64_t addr;
        struct fw_bind *tfw, *r = NULL;

        addr = ((u_int64_t)dest_hi << 32) | dest_lo;
        mutex_enter(&fc->fc_mtx);
        STAILQ_FOREACH(tfw, &fc->binds, fclist)
                if (BIND_CMP(addr, tfw) == 0) {
                        r = tfw;
                        break;
                }
        mutex_exit(&fc->fc_mtx);
        return r;
}

/*
 * To bind IEEE1394 address block to process.
 */
int
fw_bindadd(struct firewire_comm *fc, struct fw_bind *fwb)
{
        struct fw_bind *tfw, *prev = NULL;
        int r = 0;

        if (fwb->start > fwb->end) {
                aprint_error_dev(fc->bdev, "invalid range\n");
                return EINVAL;
        }

        mutex_enter(&fc->fc_mtx);
        STAILQ_FOREACH(tfw, &fc->binds, fclist) {
                if (fwb->end < tfw->start)
                        break;
                prev = tfw;
        }
        if (prev == NULL)
                STAILQ_INSERT_HEAD(&fc->binds, fwb, fclist);
        else if (prev->end < fwb->start)
                STAILQ_INSERT_AFTER(&fc->binds, prev, fwb, fclist);
        else {
                aprint_error_dev(fc->bdev, "bind failed\n");
                r = EBUSY;
        }
        mutex_exit(&fc->fc_mtx);
        return r;
}

/*
 * 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;

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

        mutex_exit(&fc->fc_mtx);
        aprint_error_dev(fc->bdev, "no such binding\n");
        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

        return 0;
}

int
fw_xferlist_add(struct fw_xferlist *q, struct malloc_type *type, int slen,
                int rlen, int n, struct firewire_comm *fc, void *sc,
                void (*hand)(struct fw_xfer *))
{
        struct fw_xfer *xfer;
        int i;

        for (i = 0; i < n; i++) {
                xfer = fw_xfer_alloc_buf(type, slen, rlen);
                if (xfer == NULL)
                        return n;
                xfer->fc = fc;
                xfer->sc = sc;
                xfer->hand = hand;
                STAILQ_INSERT_TAIL(q, xfer, link);
        }
        return n;
}

void
fw_xferlist_remove(struct fw_xferlist *q)
{
        struct fw_xfer *xfer, *next;

        for (xfer = STAILQ_FIRST(q); xfer != NULL; xfer = next) {
                next = STAILQ_NEXT(xfer, link);
                fw_xfer_free_buf(xfer);
        }
        STAILQ_INIT(q);
}

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

        xfer = malloc(sizeof(struct fw_xfer), type, M_NOWAIT | M_ZERO);
        if (xfer == NULL)
                return xfer;

        xfer->malloc = type;
        cv_init(&xfer->cv, "fwxfer");

        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 = malloc(send_len, type, M_NOWAIT | M_ZERO);
                if (xfer->send.payload == NULL) {
                        fw_xfer_free(xfer);
                        return NULL;
                }
        }
        if (recv_len > 0) {
                xfer->recv.payload = malloc(recv_len, type, M_NOWAIT);
                if (xfer->recv.payload == NULL) {
                        if (xfer->send.payload != NULL)
                                free(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->hand == NULL) {
                aprint_error_dev(xfer->fc->bdev, "hand == NULL\n");
                return;
        }

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

        fw_tl_free(xfer->fc, xfer);
        xfer->hand(xfer);
}

void
fw_xfer_unload(struct fw_xfer* xfer)
{

        if (xfer == NULL)
                return;
        if (xfer->flag & FWXF_INQ) {
                aprint_error_dev(xfer->fc->bdev, "fw_xfer_free FWXF_INQ\n");
                mutex_enter(&xfer->q->q_mtx);
                STAILQ_REMOVE(&xfer->q->q, xfer, fw_xfer, link);
#if 0
                xfer->q->queued--;
#endif
                mutex_exit(&xfer->q->q_mtx);
        }
        if (xfer->fc != NULL) {
#if 1
                if (xfer->flag == FWXF_START)
                        /*
                         * This could happen if:
                         *  1. We call fwohci_arcv() before fwohci_txd().
                         *  2. firewire_watch() is called.
                         */
                        aprint_error_dev(xfer->fc->bdev,
                            "fw_xfer_free FWXF_START\n");
#endif
        }
        xfer->flag = FWXF_INIT;
        xfer->resp = 0;
}

/*
 * To free IEEE1394 XFER structure.
 */
void
fw_xfer_free(struct fw_xfer* xfer)
{

        if (xfer == NULL) {
                aprint_error("fw_xfer_free: xfer == NULL\n");
                return;
        }
        fw_xfer_unload(xfer);
        cv_destroy(&xfer->cv);
        free(xfer, xfer->malloc);
}

void
fw_xfer_free_buf(struct fw_xfer* xfer)
{

        if (xfer == NULL) {
                aprint_error("fw_xfer_free_buf: xfer == NULL\n");
                return;
        }
        fw_xfer_unload(xfer);
        if (xfer->send.payload != NULL) {
                free(xfer->send.payload, xfer->malloc);
        }
        if (xfer->recv.payload != NULL) {
                free(xfer->recv.payload, xfer->malloc);
        }
        cv_destroy(&xfer->cv);
        free(xfer, xfer->malloc);
}

void
fw_asy_callback_free(struct fw_xfer *xfer)
{

#if 0
        printf("asyreq done flag=%d resp=%d\n", xfer->flag, xfer->resp);
#endif
        fw_xfer_free(xfer);
}

/*
 * To receive self ID.
 */
void
fw_sidrcv(struct firewire_comm* fc, uint32_t *sid, u_int len)
{
        uint32_t *p;
        union fw_self_id *self_id;
        u_int i, j, node, c_port = 0, i_branch = 0;

        fc->sid_cnt = len / (sizeof(uint32_t) * 2);
        fc->max_node = fc->nodeid & 0x3f;
        CSRARC(fc, NODE_IDS) = ((uint32_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;
        for (i = 0; i < fc->sid_cnt; i++) {
                if (sid[1] != ~sid[0]) {
                        aprint_error_dev(fc->bdev,
                            "ERROR 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 (firewire_debug)
                                fw_print_sid(sid[0]);
                        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] =
                                    uimin(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++;
        }
        /* CRC */
        fc->topology_map->crc =
            fw_crc16((uint32_t *)&fc->topology_map->generation,
                                                fc->topology_map->crc_len * 4);
        fc->speed_map->crc = fw_crc16((uint32_t *)&fc->speed_map->generation,
            fc->speed_map->crc_len * 4);
        /* byteswap and copy to CSR */
        p = (uint32_t *)fc->topology_map;
        for (i = 0; i <= fc->topology_map->crc_len; i++)
                CSRARC(fc, TOPO_MAP + i * 4) = htonl(*p++);
        p = (uint32_t *)fc->speed_map;
        CSRARC(fc, SPED_MAP) = htonl(*p++);
        CSRARC(fc, SPED_MAP + 4) = htonl(*p++);
        /* don't byte-swap uint8_t array */
        memcpy(&CSRARC(fc, SPED_MAP + 8), p, (fc->speed_map->crc_len - 1) * 4);

        fc->max_hop = fc->max_node - i_branch;
        aprint_normal_dev(fc->bdev, "%d nodes, maxhop <= %d %s irm(%d)%s\n",
            fc->max_node + 1, fc->max_hop,
            (fc->irm == -1) ? "Not IRM capable" : "cable IRM",
            fc->irm,
            (fc->irm == fc->nodeid) ? " (me)" : "");

        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_schedule(&fc->bmr_callout, hz/8);
                }
        } else
                fc->status = FWBUSMGRDONE;

        callout_schedule(&fc->busprobe_callout, hz/4);
}

/*
 * Generic packet receiving 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
        {
                uint32_t *qld;
                int i;
                qld = (uint32_t *)buf;
                printf("spd %d len:%d\n", spd, len);
                for (i = 0; i <= len && i < 32; i+= 4) {
                        printf("0x%08x ", ntohl(qld[i/4]));
                        if ((i % 16) == 15) printf("\n");
                }
                if ((i % 16) != 15) printf("\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, tcode);
                if (rb->xfer == NULL) {
                        aprint_error_dev(rb->fc->bdev, "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 0
                        printf("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) {
                                printf("no use...\n");
                                return;
                        }
#else
                        return;
#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->flag;
                rb->xfer->flag = FWXF_RCVD;
                switch (oldstate) {
                case FWXF_SENT:
                        fw_xfer_done(rb->xfer);
                        break;
                case FWXF_START:
#if 0
                        if (firewire_debug)
                                printf("not sent yet tl=%x\n", rb->xfer->tl);
#endif
                        break;
                default:
                        aprint_error_dev(rb->fc->bdev,
                            "unexpected flag 0x%02x\n", rb->xfer->flag);
                }
                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) {
#if 1
                        aprint_error_dev(rb->fc->bdev, "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));
#endif
                        if (rb->fc->status == FWBUSINIT) {
                                aprint_error_dev(rb->fc->bdev,
                                    "cannot respond(bus reset)!\n");
                                return;
                        }
                        rb->xfer = fw_xfer_alloc(M_FW);
                        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->hand = fw_xferwake;
*/
                        rb->xfer->hand = fw_xfer_free;
                        if (fw_asyreq(rb->fc, -1, rb->xfer)) {
                                fw_xfer_free(rb->xfer);
                                return;
                        }
                        return;
                }
                len = 0;
                for (i = 0; i < rb->nvec; i++)
                        len += rb->vec[i].iov_len;
                mutex_enter(&bind->fwb_mtx);
                rb->xfer = STAILQ_FIRST(&bind->xferlist);
                if (rb->xfer == NULL) {
                        mutex_exit(&bind->fwb_mtx);
#if 1
                        aprint_error_dev(rb->fc->bdev,
                            "Discard a packet for this bind.\n");
#endif
                        return;
                }
                STAILQ_REMOVE_HEAD(&bind->xferlist, link);
                mutex_exit(&bind->fwb_mtx);
                fw_rcv_copy(rb);
                rb->xfer->hand(rb->xfer);
                return;

        default:
                aprint_error_dev(rb->fc->bdev, "unknown tcode %d\n", tcode);
                break;
        }
}

/*
 * CRC16 check-sum for IEEE1394 register blocks.
 */
uint16_t
fw_crc16(uint32_t *ptr, uint32_t len)
{
        uint32_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 (uint16_t)crc;
}

int
fw_open_isodma(struct firewire_comm *fc, int tx)
{
        struct fw_xferq **xferqa;
        struct fw_xferq *xferq;
        int i;

        if (tx)
                xferqa = fc->it;
        else
                xferqa = fc->ir;

        mutex_enter(&fc->fc_mtx);
        for (i = 0; i < fc->nisodma; i++) {
                xferq = xferqa[i];
                if (!(xferq->flag & FWXFERQ_OPEN)) {
                        xferq->flag |= FWXFERQ_OPEN;
                        break;
                }
        }
        if (i == fc->nisodma) {
                aprint_error_dev(fc->bdev, "no free dma channel (tx=%d)\n", tx);
                i = -1;
        }
        mutex_exit(&fc->fc_mtx);
        return i;
}

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

        /* Protect from interrupt/timeout */
        mutex_enter(&xfer->q->q_mtx);
        xfer->flag = FWXF_INQ;
        STAILQ_INSERT_TAIL(&xfer->q->q, xfer, link);
#if 0
        xfer->q->queued++;
#endif
        mutex_exit(&xfer->q->q_mtx);
        /* XXX just queue for mbuf */
        if (xfer->mbuf == NULL)
                xfer->q->start(fc);
        return;
}

static void
firewire_xfer_timeout(struct firewire_comm *fc)
{
        struct fw_xfer *xfer;
        struct timeval tv;
        struct timeval split_timeout;
        STAILQ_HEAD(, fw_xfer) xfer_timeout;
        int i;

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

        microtime(&tv);
        timersub(&tv, &split_timeout, &tv);
        STAILQ_INIT(&xfer_timeout);

        mutex_enter(&fc->tlabel_lock);
        for (i = 0; i < 0x40; i++) {
                while ((xfer = STAILQ_FIRST(&fc->tlabels[i])) != NULL) {
                        if ((xfer->flag & FWXF_SENT) == 0)
                                /* not sent yet */
                                break;
                        if (timercmp(&xfer->tv, &tv, >))
                                /* the rests are newer than this */
                                break;
                        aprint_error_dev(fc->bdev,
                            "split transaction timeout: tl=0x%x flag=0x%02x\n",
                            i, xfer->flag);
                        fw_dump_hdr(&xfer->send.hdr, "send");
                        xfer->resp = ETIMEDOUT;
                        STAILQ_REMOVE_HEAD(&fc->tlabels[i], tlabel);
                        STAILQ_INSERT_TAIL(&xfer_timeout, xfer, tlabel);
                }
        }
        mutex_exit(&fc->tlabel_lock);
        fc->timeout(fc);

        STAILQ_FOREACH(xfer, &xfer_timeout, tlabel)
            xfer->hand(xfer);
}

#define WATCHDOG_HZ 10
static void
firewire_watchdog(void *arg)
{
        struct firewire_comm *fc;
        static int watchdog_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 (watchdog_clock > WATCHDOG_HZ * 15)
                firewire_xfer_timeout(fc);
        else
                watchdog_clock++;

        callout_schedule(&fc->timeout_callout, hz / WATCHDOG_HZ);
}

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);
#if 0
                xferq->queued--;
#endif
                xfer->resp = EAGAIN;
                xfer->flag = FWXF_SENTERR;
                fw_xfer_done(xfer);
        }
}

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) = (1U << 31);

        CSRARC(fc, CONF_ROM) = 0x04 << 24;
        CSRARC(fc, CONF_ROM + 4) = 0x31333934; /* means strings 1394 */
        CSRARC(fc, CONF_ROM + 8) =
            1U << 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;

        src = &fc->crom_src_buf->src;
        memset(src, 0, 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 = FW_GENERATION_CHANGEABLE;
        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;

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

        STAILQ_INIT(&src->chunk_list);

        memset(root, 0, 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, PROJECT_STR);
        crom_add_entry(root, CSRKEY_HW, __NetBSD_Version__);
        crom_add_simple_text(src, root, &buf->hw, hostname);
}

/*
 * dump packet header
 */
static void
fw_dump_hdr(struct fw_pkt *fp, const char *prefix)
{

        printf("%s: dst=0x%02x tl=0x%02x rt=%d tcode=0x%x pri=0x%x "
            "src=0x%03x\n", prefix,
             fp->mode.hdr.dst & 0x3f,
             fp->mode.hdr.tlrt >> 2, fp->mode.hdr.tlrt & 3,
             fp->mode.hdr.tcode, fp->mode.hdr.pri,
             fp->mode.hdr.src);
}

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

        if (xfer->tl < 0)
                return;

        mutex_enter(&fc->tlabel_lock);
#if 1 /* make sure the label is allocated */
        STAILQ_FOREACH(txfer, &fc->tlabels[xfer->tl], tlabel)
                if (txfer == xfer)
                        break;
        if (txfer == NULL) {
                mutex_exit(&fc->tlabel_lock);
                aprint_error_dev(fc->bdev,
                    "the xfer is not in the queue (tlabel=%d, flag=0x%x)\n",
                    xfer->tl, xfer->flag);
                fw_dump_hdr(&xfer->send.hdr, "send");
                fw_dump_hdr(&xfer->recv.hdr, "recv");
                KASSERT(FALSE);
                return;
        }
#endif

        STAILQ_REMOVE(&fc->tlabels[xfer->tl], xfer, fw_xfer, tlabel);
        mutex_exit(&fc->tlabel_lock);
        return;
}

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

        mutex_enter(&fc->tlabel_lock);
        STAILQ_FOREACH(xfer, &fc->tlabels[tlabel], tlabel)
                if (xfer->send.hdr.mode.hdr.dst == node) {
                        mutex_exit(&fc->tlabel_lock);
                        KASSERT(xfer->tl == tlabel);
                        /* extra sanity check */
                        req = xfer->send.hdr.mode.hdr.tcode;
                        if (xfer->fc->tcode[req].valid_res != tcode) {
                                aprint_error_dev(fc->bdev,
                                    "invalid response tcode (0x%x for 0x%x)\n",
                                    tcode, req);
                                return NULL;
                        }

                        if (firewire_debug > 2)
                                printf("fw_tl2xfer: found tl=%d\n", tlabel);
                        return xfer;
                }
        mutex_exit(&fc->tlabel_lock);
        if (firewire_debug > 1)
                printf("fw_tl2xfer: not found tl=%d\n", tlabel);
        return NULL;
}

/*
 * 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_FW);
        if (xfer == NULL)
                return;
        xfer->fc = fc;
        xfer->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)
                printf("root_node=%d gap_count=%d\n", root_node, gap_count);
        fw_asyreq(fc, -1, xfer);
}

/*
 * Dump self ID.
 */
static void
fw_print_sid(uint32_t sid)
{
        union fw_self_id *s;

        s = (union fw_self_id *) &sid;
        if (s->p0.sequel) {
                if (s->p1.sequence_num == FW_SELF_ID_PAGE0)
                        printf("node:%d p3:%d p4:%d p5:%d p6:%d p7:%d"
                            "p8:%d p9:%d p10:%d\n",
                            s->p1.phy_id, s->p1.port3, s->p1.port4,
                            s->p1.port5, s->p1.port6, s->p1.port7,
                            s->p1.port8, s->p1.port9, s->p1.port10);
                else if (s->p2.sequence_num == FW_SELF_ID_PAGE1)
                        printf("node:%d p11:%d p12:%d p13:%d p14:%d p15:%d\n",
                            s->p2.phy_id, s->p2.port11, s->p2.port12,
                            s->p2.port13, s->p2.port14, s->p2.port15);
                else
                        printf("node:%d Unknown Self ID Page number %d\n",
                            s->p1.phy_id, s->p1.sequence_num);
        } else
                printf("node:%d link:%d gap:%d spd:%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.contender,
                    s->p0.power_class, s->p0.port0, s->p0.port1,
                    s->p0.port2, s->p0.initiated_reset, s->p0.more_packets);
}

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

        mutex_enter(&fc->wait_lock);
        fc->status = FWBUSEXPLORE;

        /* Invalidate all devices, just after bus reset. */
        if (firewire_debug)
                printf("iterate and invalidate all nodes\n");
        mutex_enter(&fc->fc_mtx);
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (fwdev->status != FWDEVINVAL) {
                        fwdev->status = FWDEVINVAL;
                        fwdev->rcnt = 0;
                        if (firewire_debug)
                                printf("Invalidate Dev ID: %08x%08x\n",
                                    fwdev->eui.hi, fwdev->eui.lo);
                } else
                        if (firewire_debug)
                                printf("Dev ID: %08x%08x already invalid\n",
                                    fwdev->eui.hi, fwdev->eui.lo);
        mutex_exit(&fc->fc_mtx);

        cv_signal(&fc->fc_cv);
        mutex_exit(&fc->wait_lock);
}

static int
fw_explore_read_quads(struct fw_device *fwdev, int offset, uint32_t *quad,
                      int length)
{
        struct fw_xfer *xfer;
        uint32_t tmp;
        int i, error;

        for (i = 0; i < length; i++, offset += sizeof(uint32_t)) {
                xfer = fwmem_read_quad(fwdev, NULL, -1, 0xffff,
                    0xf0000000 | offset, (void *)&tmp, fw_xferwake);
                if (xfer == NULL)
                        return -1;
                fw_xferwait(xfer);

                if (xfer->resp == 0)
                        quad[i] = ntohl(tmp);

                error = xfer->resp;
                fw_xfer_free(xfer);
                if (error)
                        return error;
        }
        return 0;
}


static int
fw_explore_csrblock(struct fw_device *fwdev, int offset, int recur)
{
        int err, i, off;
        struct csrdirectory *dir;
        struct csrreg *reg;


        dir = (struct csrdirectory *)&fwdev->csrrom[offset/sizeof(uint32_t)];
        err = fw_explore_read_quads(fwdev, CSRROMOFF + offset, (uint32_t *)dir,
            1);
        if (err)
                return -1;

        offset += sizeof(uint32_t);
        reg = (struct csrreg *)&fwdev->csrrom[offset / sizeof(uint32_t)];
        err = fw_explore_read_quads(fwdev, CSRROMOFF + offset, (uint32_t *)reg,
            dir->crc_len);
        if (err)
                return -1;

        /* XXX check CRC */

        off = CSRROMOFF + offset + sizeof(uint32_t) * (dir->crc_len - 1);
        if (fwdev->rommax < off)
                fwdev->rommax = off;

        if (recur == 0)
                return 0;

        for (i = 0; i < dir->crc_len; i++, offset += sizeof(uint32_t)) {
                if ((reg[i].key & CSRTYPE_MASK) == CSRTYPE_D)
                        recur = 1;
                else if ((reg[i].key & CSRTYPE_MASK) == CSRTYPE_L)
                        recur = 0;
                else
                        continue;

                off = offset + reg[i].val * sizeof(uint32_t);
                if (off > CROMSIZE) {
                        aprint_error_dev(fwdev->fc->bdev, "invalid offset %d\n",
                            off);
                        return -1;
                }
                err = fw_explore_csrblock(fwdev, off, recur);
                if (err)
                        return -1;
        }
        return 0;
}

static int
fw_explore_node(struct fw_device *dfwdev)
{
        struct firewire_comm *fc;
        struct fw_device *fwdev, *pfwdev, *tfwdev;
        struct csrhdr *hdr;
        struct bus_info *binfo;
        uint32_t *csr, speed_test = 0;
        int err, node;

        fc = dfwdev->fc;
        csr = dfwdev->csrrom;
        node = dfwdev->dst;

        /* First quad */
        err = fw_explore_read_quads(dfwdev, CSRROMOFF, csr, 1);
        if (err) {
                aprint_error_dev(fc->bdev,
                    "node%d: explore_read_quads failure\n", node);
                dfwdev->status = FWDEVINVAL;
                return -1;
        }
        hdr = (struct csrhdr *)csr;
        if (hdr->info_len != 4) {
                if (firewire_debug)
                        printf("node%d: wrong bus info len(%d)\n",
                            node, hdr->info_len);
                dfwdev->status = FWDEVINVAL;
                return -1;
        }

        /* bus info */
        err = fw_explore_read_quads(dfwdev, CSRROMOFF + 0x04, &csr[1], 4);
        if (err) {
                aprint_error_dev(fc->bdev, "node%d: error reading 0x04\n",
                    node);
                dfwdev->status = FWDEVINVAL;
                return -1;
        }
        binfo = (struct bus_info *)&csr[1];
        if (binfo->bus_name != CSR_BUS_NAME_IEEE1394) {
                aprint_error_dev(fc->bdev, "node%d: invalid bus name 0x%08x\n",
                    node, binfo->bus_name);
                dfwdev->status = FWDEVINVAL;
                return -1;
        }
        if (firewire_debug)
                printf("node(%d) BUS INFO BLOCK:\n"
                    "irmc(%d) cmc(%d) isc(%d) bmc(%d) pmc(%d) "
                    "cyc_clk_acc(%d) max_rec(%d) max_rom(%d) "
                    "generation(%d) link_spd(%d)\n",
                    node, binfo->irmc, binfo->cmc, binfo->isc,
                    binfo->bmc, binfo->pmc, binfo->cyc_clk_acc,
                    binfo->max_rec, binfo->max_rom,
                    binfo->generation, binfo->link_spd);

        mutex_enter(&fc->fc_mtx);
        STAILQ_FOREACH(fwdev, &fc->devices, link)
                if (FW_EUI64_EQUAL(fwdev->eui, binfo->eui64))
                        break;
        mutex_exit(&fc->fc_mtx);
        if (fwdev == NULL) {
                /* new device */
                fwdev = malloc(sizeof(struct fw_device), M_FW, M_WAITOK | M_ZERO);
                fwdev->fc = fc;
                fwdev->eui = binfo->eui64;
                fwdev->dst = dfwdev->dst;
                fwdev->maxrec = dfwdev->maxrec;
                fwdev->status = FWDEVNEW;
                /*
                 * Pre-1394a-2000 didn't have link_spd in
                 * the Bus Info block, so try and use the 
                 * speed map value.
                 * 1394a-2000 compliant devices only use
                 * the Bus Info Block link spd value, so
                 * ignore the speed map altogether. SWB
                 */
                if (binfo->link_spd == FWSPD_S100 /* 0 */) {
                        aprint_normal_dev(fc->bdev,
                            "Pre 1394a-2000 detected\n");
                        fwdev->speed = fc->speed_map->speed[fc->nodeid][node];
                } else
                        fwdev->speed = binfo->link_spd;
                /*
                 * Test this speed with a read to the CSRROM.
                 * If it fails, slow down the speed and retry.
                 */
                while (fwdev->speed > FWSPD_S100 /* 0 */) {
                        err = fw_explore_read_quads(fwdev, CSRROMOFF,
                            &speed_test, 1);
                        if (err) {
                                aprint_error_dev(fc->bdev, "fwdev->speed(%s)"
                                    " decremented due to negotiation\n",
                                    fw_linkspeed[fwdev->speed]);
                                fwdev->speed--;
                        } else
                                break;
                }
                /*
                 * If the fwdev is not found in the
                 * fc->devices TAILQ, then we will add it.
                 */
                pfwdev = NULL;
                mutex_enter(&fc->fc_mtx);
                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);
                mutex_exit(&fc->fc_mtx);

                aprint_normal_dev(fc->bdev, "New %s device ID:%08x%08x\n",
                    fw_linkspeed[fwdev->speed], fwdev->eui.hi, fwdev->eui.lo);
        } else {
                fwdev->dst = node;
                fwdev->status = FWDEVINIT;
                /* unchanged ? */
                if (memcmp(csr, fwdev->csrrom, sizeof(uint32_t) * 5) == 0) {
                        if (firewire_debug)
                                printf("node%d: crom unchanged\n", node);
                        return 0;
                }
        }

        memset(fwdev->csrrom, 0, CROMSIZE);

        /* copy first quad and bus info block */
        memcpy(fwdev->csrrom, csr, sizeof(uint32_t) * 5);
        fwdev->rommax = CSRROMOFF + sizeof(uint32_t) * 4;

        err = fw_explore_csrblock(fwdev, 0x14, 1); /* root directory */

        if (err) {
                if (firewire_debug)
                        printf("explore csrblock failed err(%d)\n", err);
                fwdev->status = FWDEVINVAL;
                fwdev->csrrom[0] = 0;
        }
        return err;
}

/*
 * Find the self_id packet for a node, ignoring sequels.
 */
static union fw_self_id *
fw_find_self_id(struct firewire_comm *fc, int node)
{
        uint32_t i;
        union fw_self_id *s;

        for (i = 0; i < fc->topology_map->self_id_count; i++) {
                s = &fc->topology_map->self_id[i];
                if (s->p0.sequel)
                        continue;
                if (s->p0.phy_id == node)
                        return s;
        }
        return 0;
}

static void
fw_explore(struct firewire_comm *fc)
{
        struct fw_device *dfwdev;
        union fw_self_id *fwsid;
        int node, err, i, todo, todo2, trys;
        char nodes[63];

        todo = 0;
        dfwdev = malloc(sizeof(*dfwdev), M_TEMP, M_WAITOK);

        /* setup dummy fwdev */
        dfwdev->fc = fc;
        dfwdev->speed = 0;
        dfwdev->maxrec = 8; /* 512 */
        dfwdev->status = FWDEVINIT;

        for (node = 0; node <= fc->max_node; node++) {
                /* We don't probe myself and linkdown nodes */
                if (node == fc->nodeid) {
                        if (firewire_debug)
                                printf("found myself node(%d) fc->nodeid(%d)"
                                    " fc->max_node(%d)\n",
                                    node, fc->nodeid, fc->max_node);
                        continue;
                } else if (firewire_debug)
                        printf("node(%d) fc->max_node(%d) found\n",
                            node, fc->max_node);
                fwsid = fw_find_self_id(fc, node);
                if (!fwsid || !fwsid->p0.link_active) {
                        if (firewire_debug)
                                printf("node%d: link down\n", node);
                        continue;
                }
                nodes[todo++] = node;
        }

        for (trys = 0; todo > 0 && trys < 3; trys++) {
                todo2 = 0;
                for (i = 0; i < todo; i++) {
                        dfwdev->dst = nodes[i];
                        err = fw_explore_node(dfwdev);
                        if (err)
                                nodes[todo2++] = nodes[i];
                        if (firewire_debug)
                                printf("node %d, err = %d\n", nodes[i], err);
                }
                todo = todo2;
        }
        free(dfwdev, M_TEMP);
}

static void
fw_bus_probe_thread(void *arg)
{
        struct firewire_comm *fc = (struct firewire_comm *)arg;

        /*
         * Tell config we've scanned the bus.
         *
         * XXX This is not right -- we haven't actually scanned it.  We
         * probably ought to call this after the first bus exploration.
         *
         * bool once = false;
         * ...
         *      fw_attach_dev(fc);
         *      if (!once) {
         *              config_pending_decr();
         *              once = true;
         *      }
         */
        config_pending_decr(fc->bdev);

        mutex_enter(&fc->wait_lock);
        while (fc->status != FWBUSDETACH) {
                if (fc->status == FWBUSEXPLORE) {
                        mutex_exit(&fc->wait_lock);
                        fw_explore(fc);
                        fc->status = FWBUSEXPDONE;
                        if (firewire_debug)
                                printf("bus_explore done\n");
                        fw_attach_dev(fc);
                        mutex_enter(&fc->wait_lock);
                }
                cv_wait_sig(&fc->fc_cv, &fc->wait_lock);
        }
        fc->status = FWBUSDETACHOK;
        cv_signal(&fc->fc_cv);
        mutex_exit(&fc->wait_lock);
        kthread_exit(0);

        /* NOTREACHED */
}

static const char *
fw_get_devclass(struct fw_device *fwdev)
{
        struct crom_context cc;
        struct csrreg *reg;

        crom_init_context(&cc, fwdev->csrrom);
        reg = crom_search_key(&cc, CSRKEY_VER);
        if (reg == NULL)
                return "null";

        switch (reg->val) {
        case CSR_PROTAVC:
                return "av/c";
        case CSR_PROTCAL:
                return "cal";
        case CSR_PROTEHS:
                return "ehs";
        case CSR_PROTHAVI:
                return "havi";
        case CSR_PROTCAM104:
                return "cam104";
        case CSR_PROTCAM120:
                return "cam120";
        case CSR_PROTCAM130:
                return "cam130";
        case CSR_PROTDPP:
                return "printer";
        case CSR_PROTIICP:
                return "iicp";
        case CSRVAL_T10SBP2:
                return "sbp";
        default:
                if (firewire_debug)
                        printf("%s: reg->val 0x%x\n",
                                __func__, reg->val);
                return "sbp";
        }
}

/*
 * To attach sub-devices layer onto IEEE1394 bus.
 */
static void
fw_attach_dev(struct firewire_comm *fc)
{
        struct firewire_softc *sc = device_private(fc->bdev);
        struct firewire_dev_list *devlist, *elm;
        struct fw_device *fwdev, *next;
        struct firewire_dev_comm *fdc;
        struct fw_attach_args fwa;
        int locs[IEEE1394IFCF_NLOCS];

        fwa.name = "null";
        fwa.fc = fc;

        mutex_enter(&fc->fc_mtx);
        for (fwdev = STAILQ_FIRST(&fc->devices); fwdev != NULL; fwdev = next) {
                next = STAILQ_NEXT(fwdev, link);
                mutex_exit(&fc->fc_mtx);
                switch (fwdev->status) {
                case FWDEVNEW:
                        devlist = malloc(sizeof(struct firewire_dev_list),
                            M_DEVBUF, M_WAITOK);
                        locs[IEEE1394IFCF_EUIHI] = fwdev->eui.hi;
                        locs[IEEE1394IFCF_EUILO] = fwdev->eui.lo;

                        fwa.name = fw_get_devclass(fwdev);
                        fwa.fwdev = fwdev;
                        KERNEL_LOCK(1, NULL);
                        fwdev->dev = config_found(sc->dev, &fwa, firewire_print,
                            CFARGS(.submatch = config_stdsubmatch,
                                   .locators = locs));
                        KERNEL_UNLOCK_ONE(NULL);
                        if (fwdev->dev == NULL) {
                                free(devlist, M_DEVBUF);
                                break;
                        }

                        devlist->fwdev = fwdev;
                        devlist->dev = fwdev->dev;

                        mutex_enter(&fc->fc_mtx);
                        if (SLIST_EMPTY(&sc->devlist))
                                SLIST_INSERT_HEAD(&sc->devlist, devlist, link);
                        else {
                                for (elm = SLIST_FIRST(&sc->devlist);
                                    SLIST_NEXT(elm, link) != NULL;
                                    elm = SLIST_NEXT(elm, link));
                                SLIST_INSERT_AFTER(elm, devlist, link);
                        }
                        mutex_exit(&fc->fc_mtx);

                        /* FALLTHROUGH */

                case FWDEVINIT:
                case FWDEVATTACHED:
                        fwdev->status = FWDEVATTACHED;
                        break;

                case FWDEVINVAL:
                        fwdev->rcnt++;
                        if (firewire_debug)
                                printf("fwdev->rcnt(%d), hold_count(%d)\n",
                                    fwdev->rcnt, hold_count);
                        break;

                default:
                        /* XXX */
                        break;
                }
                mutex_enter(&fc->fc_mtx);
        }
        mutex_exit(&fc->fc_mtx);

        SLIST_FOREACH(devlist, &sc->devlist, link) {
                fdc = device_private(devlist->dev);
                if (fdc->post_explore != NULL)
                        fdc->post_explore(fdc);
        }

        for (fwdev = STAILQ_FIRST(&fc->devices); fwdev != NULL; fwdev = next) {
                next = STAILQ_NEXT(fwdev, link);
                if (fwdev->rcnt > 0 && fwdev->rcnt > hold_count) {
                        /*
                         * Remove devices which have not been seen
                         * for a while.
                         */
                        SLIST_FOREACH(devlist, &sc->devlist, link)
                                if (devlist->fwdev == fwdev)
                                        break;

                        if (devlist == NULL)
                                continue;

                        if (devlist->fwdev != fwdev)
                                panic("already detached");

                        SLIST_REMOVE(&sc->devlist, devlist, firewire_dev_list,
                            link);
                        free(devlist, M_DEVBUF);

                        if (config_detach(fwdev->dev, DETACH_FORCE) != 0)
                                return;

                        STAILQ_REMOVE(&fc->devices, fwdev, fw_device, link);
                        free(fwdev, M_FW);
                }
        }

        return;
}

/*
 * To allocate unique transaction label.
 */
static int
fw_get_tlabel(struct firewire_comm *fc, struct fw_xfer *xfer)
{
        u_int dst, new_tlabel;
        struct fw_xfer *txfer;

        dst = xfer->send.hdr.mode.hdr.dst & 0x3f;
        mutex_enter(&fc->tlabel_lock);
        new_tlabel = (fc->last_tlabel[dst] + 1) & 0x3f;
        STAILQ_FOREACH(txfer, &fc->tlabels[new_tlabel], tlabel)
                if ((txfer->send.hdr.mode.hdr.dst & 0x3f) == dst)
                        break;
        if (txfer == NULL) {
                fc->last_tlabel[dst] = new_tlabel;
                STAILQ_INSERT_TAIL(&fc->tlabels[new_tlabel], xfer, tlabel);
                mutex_exit(&fc->tlabel_lock);
                xfer->tl = new_tlabel;
                xfer->send.hdr.mode.hdr.tlrt = new_tlabel << 2;
                if (firewire_debug > 1)
                        printf("fw_get_tlabel: dst=%d tl=%d\n",
                            dst, new_tlabel);
                return new_tlabel;
        }
        mutex_exit(&fc->tlabel_lock);

        if (firewire_debug > 1)
                printf("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;
        const 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;
        memcpy(p, rb->vec->iov_base, tinfo->hdr_len);
        rb->vec->iov_base = (u_char *)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(uint32_t)) {
                *(uint32_t *)p = pkt->mode.rresq.data;
                rb->xfer->recv.pay_len = sizeof(uint32_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) {
                        aprint_error_dev(rb->fc->bdev,
                            "rcv buffer(%d) is %d bytes short.\n",
                            rb->xfer->recv.pay_len, len - res);
                        len = res;
                }
                if (p) {
                        memcpy(p, rb->vec->iov_base, len);
                        p += len;
                }
                res -= len;
                plen -= len;
                if (res == 0 || plen == 0)
                        break;
        }
        rb->xfer->recv.pay_len -= res;

}

/*
 * 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:
        aprint_error_dev(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_FW, 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->hand = fw_try_bmr_callback;

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

/*
 * Find the root node, if it is not
 * Cycle Master Capable, then we should
 * override this and become the Cycle
 * Master
 */
static int
fw_bmr(struct firewire_comm *fc)
{
        struct fw_device fwdev;
        union fw_self_id *self_id;
        int cmstr;
        uint32_t quad;

        /* Check to see if the current root node is cycle master capable */
        self_id = fw_find_self_id(fc, 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 {
                        aprint_normal_dev(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;

        aprint_normal_dev(fc->bdev, "bus manager %d%s\n",
            CSRARC(fc, BUS_MGR_ID),
            (CSRARC(fc, BUS_MGR_ID) != fc->nodeid) ? " (me)" : "");
        if (CSRARC(fc, BUS_MGR_ID) != fc->nodeid)
                /* We are not the bus manager */
                return 0;

        /* 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 */
        memset(&fwdev, 0, 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;
}