xref: /src/sys/dev/ieee1394/fwohci.c

/*	$NetBSD: fwohci.c,v 1.62 2002/12/04 00:28:41 haya Exp $	*/

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matt Thomas of 3am Software Foundry.
 *
 * 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 following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * IEEE1394 Open Host Controller Interface
 *	based on OHCI Specification 1.1 (January 6, 2000)
 * The first version to support network interface part is wrtten by
 * Atsushi Onoe <onoe (at) netbsd.org>.
 */

/*
 * The first version to support isochronous acquisition part is wrtten
 * by HAYAKAWA Koichi <haya (at) netbsd.org>.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fwohci.c,v 1.62 2002/12/04 00:28:41 haya Exp $");

#define FWOHCI_WAIT_DEBUG 1

#define FWOHCI_IT_BUFNUM 4

#include "opt_inet.h"
#include "fwiso.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kthread.h>
#include <sys/socket.h>
#include <sys/callout.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/poll.h>
#include <sys/select.h>

#if __NetBSD_Version__ >= 105010000
#include <uvm/uvm_extern.h>
#else
#include <vm/vm.h>
#endif

#include <machine/bus.h>
#include <machine/intr.h>

#include <dev/ieee1394/ieee1394reg.h>
#include <dev/ieee1394/fwohcireg.h>

#include <dev/ieee1394/ieee1394var.h>
#include <dev/ieee1394/fwohcivar.h>
#include <dev/ieee1394/fwisovar.h>

static const char * const ieee1394_speeds[] = { IEEE1394_SPD_STRINGS };

#if 0
static int fwohci_dnamem_alloc(struct fwohci_softc *sc, int size,
    int alignment, bus_dmamap_t *mapp, caddr_t *kvap, int flags);
#endif
static void fwohci_create_event_thread(void *);
static void fwohci_thread_init(void *);

static void fwohci_event_thread(struct fwohci_softc *);
static void fwohci_hw_init(struct fwohci_softc *);
static void fwohci_power(int, void *);
static void fwohci_shutdown(void *);

static int  fwohci_desc_alloc(struct fwohci_softc *);
static struct fwohci_desc *fwohci_desc_get(struct fwohci_softc *, int);
static void fwohci_desc_put(struct fwohci_softc *, struct fwohci_desc *, int);

static int  fwohci_ctx_alloc(struct fwohci_softc *, struct fwohci_ctx **,
    int, int, int);
static void fwohci_ctx_free(struct fwohci_softc *, struct fwohci_ctx *);
static void fwohci_ctx_init(struct fwohci_softc *, struct fwohci_ctx *);

static int fwohci_misc_dmabuf_alloc(bus_dma_tag_t, int, int,
    bus_dma_segment_t *, bus_dmamap_t *, void **, const char *);
static void fwohci_misc_dmabuf_free(bus_dma_tag_t, int, int,
    bus_dma_segment_t *, bus_dmamap_t *, caddr_t);

static struct fwohci_ir_ctx *fwohci_ir_ctx_construct(struct fwohci_softc *,
    int, int, int, int, int, int);
static void fwohci_ir_ctx_destruct(struct fwohci_ir_ctx *);

static int fwohci_ir_buf_setup(struct fwohci_ir_ctx *);
static int fwohci_ir_init(struct fwohci_ir_ctx *);
static int fwohci_ir_start(struct fwohci_ir_ctx *);
static void fwohci_ir_intr(struct fwohci_softc *, struct fwohci_ir_ctx *);
static int fwohci_ir_stop(struct fwohci_ir_ctx *);
static int fwohci_ir_ctx_packetnum(struct fwohci_ir_ctx *);
#ifdef USEDRAIN
static int fwohci_ir_ctx_drain(struct fwohci_ir_ctx *);
#endif /* USEDRAIN */

static int fwohci_it_desc_alloc(struct fwohci_it_ctx *);
static void fwohci_it_desc_free(struct fwohci_it_ctx *itc);
struct fwohci_it_ctx *fwohci_it_ctx_construct(struct fwohci_softc *,
    int, int, int, int);
void fwohci_it_ctx_destruct(struct fwohci_it_ctx *);
int fwohci_it_ctx_writedata(ieee1394_it_tag_t, int,
    struct ieee1394_it_datalist *, int);
static void fwohci_it_ctx_run(struct fwohci_it_ctx *);
int fwohci_it_ctx_flush(ieee1394_it_tag_t);
static void fwohci_it_intr(struct fwohci_softc *, struct fwohci_it_ctx *);

int fwohci_itd_construct(struct fwohci_it_ctx *, struct fwohci_it_dmabuf *,
    int, struct fwohci_desc *, bus_addr_t, int, int, paddr_t);
void fwohci_itd_destruct(struct fwohci_it_dmabuf *);
static int fwohci_itd_dmabuf_alloc(struct fwohci_it_dmabuf *);
static void fwohci_itd_dmabuf_free(struct fwohci_it_dmabuf *);
int fwohci_itd_link(struct fwohci_it_dmabuf *, struct fwohci_it_dmabuf *);
int fwohci_itd_unlink(struct fwohci_it_dmabuf *);
int fwohci_itd_writedata(struct fwohci_it_dmabuf *, int,
    struct ieee1394_it_datalist *);
int fwohci_itd_isfilled(struct fwohci_it_dmabuf *);

static int  fwohci_buf_alloc(struct fwohci_softc *, struct fwohci_buf *);
static void fwohci_buf_free(struct fwohci_softc *, struct fwohci_buf *);
static void fwohci_buf_init_rx(struct fwohci_softc *);
static void fwohci_buf_start_rx(struct fwohci_softc *);
static void fwohci_buf_stop_tx(struct fwohci_softc *);
static void fwohci_buf_stop_rx(struct fwohci_softc *);
static void fwohci_buf_next(struct fwohci_softc *, struct fwohci_ctx *);
static int  fwohci_buf_pktget(struct fwohci_softc *, struct fwohci_buf **,
    caddr_t *, int);
static int  fwohci_buf_input(struct fwohci_softc *, struct fwohci_ctx *,
    struct fwohci_pkt *);
static int  fwohci_buf_input_ppb(struct fwohci_softc *, struct fwohci_ctx *,
    struct fwohci_pkt *);

static u_int8_t fwohci_phy_read(struct fwohci_softc *, u_int8_t);
static void fwohci_phy_write(struct fwohci_softc *, u_int8_t, u_int8_t);
static void fwohci_phy_busreset(struct fwohci_softc *);
static void fwohci_phy_input(struct fwohci_softc *, struct fwohci_pkt *);

static int  fwohci_handler_set(struct fwohci_softc *, int, u_int32_t, u_int32_t,
    int (*)(struct fwohci_softc *, void *, struct fwohci_pkt *), void *);

ieee1394_ir_tag_t fwohci_ir_ctx_set(struct device *, int, int, int, int, int);
int fwohci_ir_ctx_clear(struct device *, ieee1394_ir_tag_t);
int fwohci_ir_read(struct device *, ieee1394_ir_tag_t, struct uio *,
    int, int);
int fwohci_ir_wait(struct device *, ieee1394_ir_tag_t, void *, char *name);
int fwohci_ir_select(struct device *, ieee1394_ir_tag_t, struct proc *);



ieee1394_it_tag_t fwohci_it_set(struct ieee1394_softc *, int, int);
static ieee1394_it_tag_t fwohci_it_ctx_set(struct fwohci_softc *, int, int, int);
int fwohci_it_ctx_clear(ieee1394_it_tag_t *);

static void fwohci_arrq_input(struct fwohci_softc *, struct fwohci_ctx *);
static void fwohci_arrs_input(struct fwohci_softc *, struct fwohci_ctx *);
static void fwohci_as_input(struct fwohci_softc *, struct fwohci_ctx *);

static int  fwohci_at_output(struct fwohci_softc *, struct fwohci_ctx *,
    struct fwohci_pkt *);
static void fwohci_at_done(struct fwohci_softc *, struct fwohci_ctx *, int);
static void fwohci_atrs_output(struct fwohci_softc *, int, struct fwohci_pkt *,
    struct fwohci_pkt *);

static int  fwohci_guidrom_init(struct fwohci_softc *);
static void fwohci_configrom_init(struct fwohci_softc *);
static int  fwohci_configrom_input(struct fwohci_softc *, void *,
    struct fwohci_pkt *);
static void fwohci_selfid_init(struct fwohci_softc *);
static int  fwohci_selfid_input(struct fwohci_softc *);

static void fwohci_csr_init(struct fwohci_softc *);
static int  fwohci_csr_input(struct fwohci_softc *, void *,
    struct fwohci_pkt *);

static void fwohci_uid_collect(struct fwohci_softc *);
static void fwohci_uid_req(struct fwohci_softc *, int);
static int  fwohci_uid_input(struct fwohci_softc *, void *,
    struct fwohci_pkt *);
static int  fwohci_uid_lookup(struct fwohci_softc *, const u_int8_t *);
static void fwohci_check_nodes(struct fwohci_softc *);

static int  fwohci_if_inreg(struct device *, u_int32_t, u_int32_t,
    void (*)(struct device *, struct mbuf *));
static int  fwohci_if_input(struct fwohci_softc *, void *, struct fwohci_pkt *);
static int  fwohci_if_input_iso(struct fwohci_softc *, void *, struct fwohci_pkt *);

static int  fwohci_if_output(struct device *, struct mbuf *,
    void (*)(struct device *, struct mbuf *));
static int fwohci_if_setiso(struct device *, u_int32_t, u_int32_t, u_int32_t,
    void (*)(struct device *, struct mbuf *));
static int  fwohci_read(struct ieee1394_abuf *);
static int  fwohci_write(struct ieee1394_abuf *);
static int  fwohci_read_resp(struct fwohci_softc *, void *, struct fwohci_pkt *);
static int  fwohci_write_ack(struct fwohci_softc *, void *, struct fwohci_pkt *);
static int  fwohci_read_multi_resp(struct fwohci_softc *, void *,
    struct fwohci_pkt *);
static int  fwohci_inreg(struct ieee1394_abuf *, int);
static int  fwohci_unreg(struct ieee1394_abuf *, int);
static int  fwohci_parse_input(struct fwohci_softc *, void *,
    struct fwohci_pkt *);
static int  fwohci_submatch(struct device *, struct cfdata *, void *);

/* XXX */
u_int16_t fwohci_cycletimer(struct fwohci_softc *);
u_int16_t fwohci_it_cycletimer(ieee1394_it_tag_t);

#ifdef FW_DEBUG
static void fwohci_show_intr(struct fwohci_softc *, u_int32_t);
static void fwohci_show_phypkt(struct fwohci_softc *, u_int32_t);

/* 1 is normal debug, 2 is verbose debug, 3 is complete (packet dumps). */

#define DPRINTF(x)      if (fwdebug) printf x
#define DPRINTFN(n,x)   if (fwdebug>(n)) printf x
int     fwdebug = 1;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

#define OHCI_ITHEADER_SPD_MASK		0x00070000
#define OHCI_ITHEADER_SPD_BITPOS	16
#define OHCI_ITHEADER_TAG_MASK		0x0000c000
#define OHCI_ITHEADER_TAG_BITPOS	14
#define OHCI_ITHEADER_CHAN_MASK		0x00003f00
#define OHCI_ITHEADER_CHAN_BITPOS	8
#define OHCI_ITHEADER_TCODE_MASK	0x000000f0
#define OHCI_ITHEADER_TCODE_BITPOS	4
#define OHCI_ITHEADER_SY_MASK		0x0000000f
#define OHCI_ITHEADER_SY_BITPOS		0

#define OHCI_ITHEADER_VAL(fld, val) \
	(OHCI_ITHEADER_##fld##_MASK & ((val) << OHCI_ITHEADER_##fld##_BITPOS))

int
fwohci_init(struct fwohci_softc *sc, const struct evcnt *ev)
{
	int i;
	u_int32_t val;
#if 0
	int error;
#endif

	evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, ev,
	    sc->sc_sc1394.sc1394_dev.dv_xname, "intr");

	evcnt_attach_dynamic(&sc->sc_isocnt, EVCNT_TYPE_MISC, ev,
	    sc->sc_sc1394.sc1394_dev.dv_xname, "isorcvs");
	evcnt_attach_dynamic(&sc->sc_ascnt, EVCNT_TYPE_MISC, ev,
	    sc->sc_sc1394.sc1394_dev.dv_xname, "asrcvs");
	evcnt_attach_dynamic(&sc->sc_itintrcnt, EVCNT_TYPE_INTR, ev,
	    sc->sc_sc1394.sc1394_dev.dv_xname, "itintr");

	/*
	 * Wait for reset completion
	 */
	for (i = 0; i < OHCI_LOOP; i++) {
		val = OHCI_CSR_READ(sc, OHCI_REG_HCControlClear);
		if ((val & OHCI_HCControl_SoftReset) == 0)
			break;
		DELAY(10);
	}

	/* What dialect of OHCI is this device?
	 */
	val = OHCI_CSR_READ(sc, OHCI_REG_Version);
	printf("%s: OHCI %u.%u", sc->sc_sc1394.sc1394_dev.dv_xname,
	    OHCI_Version_GET_Version(val), OHCI_Version_GET_Revision(val));

	LIST_INIT(&sc->sc_nodelist);

	if (fwohci_guidrom_init(sc) != 0) {
		printf("\n%s: fatal: no global UID ROM\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
		return -1;
	}

	printf(", %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x",
	    sc->sc_sc1394.sc1394_guid[0], sc->sc_sc1394.sc1394_guid[1],
	    sc->sc_sc1394.sc1394_guid[2], sc->sc_sc1394.sc1394_guid[3],
	    sc->sc_sc1394.sc1394_guid[4], sc->sc_sc1394.sc1394_guid[5],
	    sc->sc_sc1394.sc1394_guid[6], sc->sc_sc1394.sc1394_guid[7]);

	/* Get the maximum link speed and receive size
	 */
	val = OHCI_CSR_READ(sc, OHCI_REG_BusOptions);
	sc->sc_sc1394.sc1394_link_speed =
	    OHCI_BITVAL(val, OHCI_BusOptions_LinkSpd);
	if (sc->sc_sc1394.sc1394_link_speed < IEEE1394_SPD_MAX) {
		printf(", %s",
		    ieee1394_speeds[sc->sc_sc1394.sc1394_link_speed]);
	} else {
		printf(", unknown speed %u", sc->sc_sc1394.sc1394_link_speed);
	}

	/* MaxRec is encoded as log2(max_rec_octets)-1
	 */
	sc->sc_sc1394.sc1394_max_receive =
	    1 << (OHCI_BITVAL(val, OHCI_BusOptions_MaxRec) + 1);
	printf(", %u max_rec", sc->sc_sc1394.sc1394_max_receive);

	/*
	 * Count how many isochronous receive ctx we have.
	 */
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoRecvIntMaskSet, ~0);
	val = OHCI_CSR_READ(sc, OHCI_REG_IsoRecvIntMaskClear);
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoRecvIntMaskClear, ~0);
	for (i = 0; val != 0; val >>= 1) {
		if (val & 0x1)
			i++;
	}
	sc->sc_isoctx = i;
	printf(", %d ir_ctx", sc->sc_isoctx);

	/*
	 * Count how many isochronous transmit ctx we have.
	 */
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoXmitIntMaskSet, ~0);
	val = OHCI_CSR_READ(sc, OHCI_REG_IsoXmitIntMaskClear);
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoXmitIntMaskClear, ~0);
	for (i = 0; val != 0; val >>= 1) {
		if (val & 0x1) {
			i++;
			OHCI_SYNC_TX_DMA_WRITE(sc, i,OHCI_SUBREG_CommandPtr,0);
		}
	}
	sc->sc_itctx = i;

	printf(", %d it_ctx", sc->sc_itctx);

	printf("\n");

#if 0
	error = fwohci_dnamem_alloc(sc, OHCI_CONFIG_SIZE,
	    OHCI_CONFIG_ALIGNMENT, &sc->sc_configrom_map,
	    (caddr_t *) &sc->sc_configrom, BUS_DMA_WAITOK|BUS_DMA_COHERENT);
	return error;
#endif

	sc->sc_dying = 0;
	sc->sc_nodeid = 0xffff;		/* invalid */

	sc->sc_sc1394.sc1394_callback.sc1394_read = fwohci_read;
	sc->sc_sc1394.sc1394_callback.sc1394_write = fwohci_write;
	sc->sc_sc1394.sc1394_callback.sc1394_inreg = fwohci_inreg;
	sc->sc_sc1394.sc1394_callback.sc1394_unreg = fwohci_unreg;

	kthread_create(fwohci_create_event_thread, sc);
	return 0;
}

static int
fwohci_if_setiso(struct device *self, u_int32_t channel, u_int32_t tag,
    u_int32_t direction, void (*handler)(struct device *, struct mbuf *))
{
	struct fwohci_softc *sc = (struct fwohci_softc *)self;
	int retval;
	int s;

	if (direction == 1) {
		return EIO;
	}

	s = splnet();
	retval = fwohci_handler_set(sc, IEEE1394_TCODE_STREAM_DATA,
	    channel, 1 << tag, fwohci_if_input_iso, handler);
	splx(s);

	if (!retval) {
		printf("%s: dummy iso handler set\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
	} else {
		printf("%s: dummy iso handler cannot set\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
	}

	return retval;
}

int
fwohci_intr(void *arg)
{
	struct fwohci_softc * const sc = arg;
	int progress = 0;
	u_int32_t intmask, iso;

	for (;;) {
		intmask = OHCI_CSR_READ(sc, OHCI_REG_IntEventClear);

		/*
		 * On a bus reset, everything except bus reset gets
		 * cleared.  That can't get cleared until the selfid
		 * phase completes (which happens outside the
		 * interrupt routines). So if just a bus reset is left
		 * in the mask and it's already in the sc_intmask,
		 * just return.
		 */

		if ((intmask == 0) ||
		    (progress && (intmask == OHCI_Int_BusReset) &&
			(sc->sc_intmask & OHCI_Int_BusReset))) {
			if (progress)
				wakeup(fwohci_event_thread);
			return progress;
		}
		OHCI_CSR_WRITE(sc, OHCI_REG_IntEventClear,
		    intmask & ~OHCI_Int_BusReset);
#ifdef FW_DEBUG
		if (fwdebug > 1)
			fwohci_show_intr(sc, intmask);
#endif

		if (intmask & OHCI_Int_BusReset) {
			/*
			 * According to OHCI spec 6.1.1 "busReset",
			 * All asynchronous transmit must be stopped before
			 * clearing BusReset.  Moreover, the BusReset
			 * interrupt bit should not be cleared during the
			 * SelfID phase.  Thus we turned off interrupt mask
			 * bit of BusReset instead until SelfID completion
			 * or SelfID timeout.
			 */
			intmask &= OHCI_Int_SelfIDComplete;
			OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskClear,
			    OHCI_Int_BusReset);
			sc->sc_intmask = OHCI_Int_BusReset;
		}
		sc->sc_intmask |= intmask;

		if (intmask & OHCI_Int_IsochTx) {
			int i;

			iso = OHCI_CSR_READ(sc, OHCI_REG_IsoXmitIntEventClear);
			OHCI_CSR_WRITE(sc, OHCI_REG_IsoXmitIntEventClear, iso);

			sc->sc_itintrcnt.ev_count++;
			for (i = 0; i < sc->sc_itctx; ++i) {
				if ((iso & (1<<i)) == 0 ||
				    sc->sc_ctx_it[i] == NULL) {
					continue;
				}

				fwohci_it_intr(sc, sc->sc_ctx_it[i]);
			}
		}
		if (intmask & OHCI_Int_IsochRx) {
			int i;

			iso = OHCI_CSR_READ(sc, OHCI_REG_IsoRecvIntEventClear);
			OHCI_CSR_WRITE(sc, OHCI_REG_IsoRecvIntEventClear, iso);

			for (i = 0; i < sc->sc_isoctx; i++) {
				if ((iso & (1 << i))
				    && sc->sc_ctx_ir[i] != NULL) {
					iso &= ~(1 << i);
					fwohci_ir_intr(sc, sc->sc_ctx_ir[i]);
				}
			}

			if (iso == 0) {
				sc->sc_intmask &= ~OHCI_Int_IsochRx;
			}
			sc->sc_iso |= iso;
		}

		if (!progress) {
			sc->sc_intrcnt.ev_count++;
			progress = 1;
		}
	}
}

static void
fwohci_create_event_thread(void *arg)
{
	struct fwohci_softc  *sc = arg;

	if (kthread_create1(fwohci_thread_init, sc, &sc->sc_event_thread, "%s",
	    sc->sc_sc1394.sc1394_dev.dv_xname)) {
		printf("%s: unable to create event thread\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
		panic("fwohci_create_event_thread");
	}
}

static void
fwohci_thread_init(void *arg)
{
	struct fwohci_softc *sc = arg;
	int i;

	/*
	 * Allocate descriptors
	 */
	if (fwohci_desc_alloc(sc)) {
		printf("%s: not enabling interrupts\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
		kthread_exit(1);
	}

	/*
	 * Enable Link Power
	 */

	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet, OHCI_HCControl_LPS);

	/*
	 * Allocate DMA Context
	 */
	fwohci_ctx_alloc(sc, &sc->sc_ctx_arrq, OHCI_BUF_ARRQ_CNT,
	    OHCI_CTX_ASYNC_RX_REQUEST, FWOHCI_CTX_ASYNC);
	fwohci_ctx_alloc(sc, &sc->sc_ctx_arrs, OHCI_BUF_ARRS_CNT,
	    OHCI_CTX_ASYNC_RX_RESPONSE, FWOHCI_CTX_ASYNC);
	fwohci_ctx_alloc(sc, &sc->sc_ctx_atrq, 0, OHCI_CTX_ASYNC_TX_REQUEST,
	    FWOHCI_CTX_ASYNC);
	fwohci_ctx_alloc(sc, &sc->sc_ctx_atrs, 0, OHCI_CTX_ASYNC_TX_RESPONSE,
	    FWOHCI_CTX_ASYNC);
	sc->sc_ctx_as = malloc(sizeof(sc->sc_ctx_as[0]) * sc->sc_isoctx,
	    M_DEVBUF, M_WAITOK);
	if (sc->sc_ctx_as == NULL) {
		printf("no asynchronous stream\n");
	} else {
		for (i = 0; i < sc->sc_isoctx; i++)
			sc->sc_ctx_as[i] = NULL;
	}
	sc->sc_ctx_ir = malloc(sizeof(sc->sc_ctx_ir[0]) * sc->sc_isoctx,
	    M_DEVBUF, M_WAITOK|M_ZERO);
	sc->sc_ctx_it = malloc(sizeof(sc->sc_ctx_it[0]) * sc->sc_itctx,
	    M_DEVBUF, M_WAITOK|M_ZERO);

	/*
	 * Allocate buffer for configuration ROM and SelfID buffer
	 */
	fwohci_buf_alloc(sc, &sc->sc_buf_cnfrom);
	fwohci_buf_alloc(sc, &sc->sc_buf_selfid);

	callout_init(&sc->sc_selfid_callout);

	sc->sc_sc1394.sc1394_ifinreg = fwohci_if_inreg;
	sc->sc_sc1394.sc1394_ifoutput = fwohci_if_output;
	sc->sc_sc1394.sc1394_ifsetiso = fwohci_if_setiso;

	sc->sc_sc1394.sc1394_ir_open = fwohci_ir_ctx_set;
	sc->sc_sc1394.sc1394_ir_close = fwohci_ir_ctx_clear;
	sc->sc_sc1394.sc1394_ir_read = fwohci_ir_read;
	sc->sc_sc1394.sc1394_ir_wait = fwohci_ir_wait;
	sc->sc_sc1394.sc1394_ir_select = fwohci_ir_select;

#if 0
	sc->sc_sc1394.sc1394_it_open = fwohci_it_open;
	sc->sc_sc1394.sc1394_it_write = fwohci_it_write;
	sc->sc_sc1394.sc1394_it_close = fwohci_it_close;
	/* XXX: need fwohci_it_flush? */
#endif

	/*
	 * establish hooks for shutdown and suspend/resume
	 */
	sc->sc_shutdownhook = shutdownhook_establish(fwohci_shutdown, sc);
	sc->sc_powerhook = powerhook_establish(fwohci_power, sc);

	sc->sc_sc1394.sc1394_if = config_found(&sc->sc_sc1394.sc1394_dev, "fw",
	    fwohci_print);

#if NFWISO > 0
	fwiso_register_if(&sc->sc_sc1394);
#endif

	/* Main loop. It's not coming back normally. */

	fwohci_event_thread(sc);

	kthread_exit(0);
}

static void
fwohci_event_thread(struct fwohci_softc *sc)
{
	int i, s;
	u_int32_t intmask, iso;

	s = splbio();

	/*
	 * Initialize hardware registers.
	 */

	fwohci_hw_init(sc);

	/* Initial Bus Reset */
	fwohci_phy_busreset(sc);
	splx(s);

	while (!sc->sc_dying) {
		s = splbio();
		intmask = sc->sc_intmask;
		if (intmask == 0) {
			tsleep(fwohci_event_thread, PZERO, "fwohciev", 0);
			splx(s);
			continue;
		}
		sc->sc_intmask = 0;
		splx(s);

		if (intmask & OHCI_Int_BusReset) {
			fwohci_buf_stop_tx(sc);
			if (sc->sc_uidtbl != NULL) {
				free(sc->sc_uidtbl, M_DEVBUF);
				sc->sc_uidtbl = NULL;
			}

			callout_reset(&sc->sc_selfid_callout,
			    OHCI_SELFID_TIMEOUT,
			    (void (*)(void *))fwohci_phy_busreset, sc);
			sc->sc_nodeid = 0xffff;	/* indicate invalid */
			sc->sc_rootid = 0;
			sc->sc_irmid = IEEE1394_BCAST_PHY_ID;
		}
		if (intmask & OHCI_Int_SelfIDComplete) {
			s = splbio();
			OHCI_CSR_WRITE(sc, OHCI_REG_IntEventClear,
			    OHCI_Int_BusReset);
			OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskSet,
			    OHCI_Int_BusReset);
			splx(s);
			callout_stop(&sc->sc_selfid_callout);
			if (fwohci_selfid_input(sc) == 0) {
				fwohci_buf_start_rx(sc);
				fwohci_uid_collect(sc);
			}
		}
		if (intmask & OHCI_Int_ReqTxComplete)
			fwohci_at_done(sc, sc->sc_ctx_atrq, 0);
		if (intmask & OHCI_Int_RespTxComplete)
			fwohci_at_done(sc, sc->sc_ctx_atrs, 0);
		if (intmask & OHCI_Int_RQPkt)
			fwohci_arrq_input(sc, sc->sc_ctx_arrq);
		if (intmask & OHCI_Int_RSPkt)
			fwohci_arrs_input(sc, sc->sc_ctx_arrs);
		if (intmask & OHCI_Int_IsochRx) {
			if (sc->sc_ctx_as == NULL) {
				continue;
			}
			s = splbio();
			iso = sc->sc_iso;
			sc->sc_iso = 0;
			splx(s);
			for (i = 0; i < sc->sc_isoctx; i++) {
				if ((iso & (1 << i)) &&
				    sc->sc_ctx_as[i] != NULL) {
					fwohci_as_input(sc, sc->sc_ctx_as[i]);
					sc->sc_ascnt.ev_count++;
				}
			}
		}
	}
}

#if 0
static int
fwohci_dnamem_alloc(struct fwohci_softc *sc, int size, int alignment,
    bus_dmamap_t *mapp, caddr_t *kvap, int flags)
{
	bus_dma_segment_t segs[1];
	int error, nsegs, steps;

	steps = 0;
	error = bus_dmamem_alloc(sc->sc_dmat, size, alignment, alignment,
	    segs, 1, &nsegs, flags);
	if (error)
		goto cleanup;

	steps = 1;
	error = bus_dmamem_map(sc->sc_dmat, segs, nsegs, segs[0].ds_len,
	    kvap, flags);
	if (error)
		goto cleanup;

	if (error == 0)
		error = bus_dmamap_create(sc->sc_dmat, size, 1, alignment,
		    size, flags, mapp);
	if (error)
		goto cleanup;
	if (error == 0)
		error = bus_dmamap_load(sc->sc_dmat, *mapp, *kvap, size, NULL,
		    flags);
	if (error)
		goto cleanup;

 cleanup:
	switch (steps) {
	case 1:
		bus_dmamem_free(sc->sc_dmat, segs, nsegs);
	}

	return error;
}
#endif

int
fwohci_print(void *aux, const char *pnp)
{
	char *name = aux;

	if (pnp)
		printf("%s at %s", name, pnp);

	return UNCONF;
}

static void
fwohci_hw_init(struct fwohci_softc *sc)
{
	int i;
	u_int32_t val;

	/*
	 * Software Reset.
	 */
	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet, OHCI_HCControl_SoftReset);
	for (i = 0; i < OHCI_LOOP; i++) {
		val = OHCI_CSR_READ(sc, OHCI_REG_HCControlClear);
		if ((val & OHCI_HCControl_SoftReset) == 0)
			break;
		DELAY(10);
	}

	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet, OHCI_HCControl_LPS);

	/*
	 * First, initilize CSRs with undefined value to default settings.
	 */
	val = OHCI_CSR_READ(sc, OHCI_REG_BusOptions);
	val |= OHCI_BusOptions_ISC | OHCI_BusOptions_CMC;
#if 0
	val |= OHCI_BusOptions_BMC | OHCI_BusOptions_IRMC;
#else
	val &= ~(OHCI_BusOptions_BMC | OHCI_BusOptions_IRMC);
#endif
	OHCI_CSR_WRITE(sc, OHCI_REG_BusOptions, val);
	for (i = 0; i < sc->sc_isoctx; i++) {
		OHCI_SYNC_RX_DMA_WRITE(sc, i, OHCI_SUBREG_ContextControlClear,
		    ~0);
	}
	for (i = 0; i < sc->sc_itctx; i++) {
		OHCI_SYNC_TX_DMA_WRITE(sc, i, OHCI_SUBREG_ContextControlClear,
		    ~0);
	}
	OHCI_CSR_WRITE(sc, OHCI_REG_LinkControlClear, ~0);

	fwohci_configrom_init(sc);
	fwohci_selfid_init(sc);
	fwohci_buf_init_rx(sc);
	fwohci_csr_init(sc);

	/*
	 * Final CSR settings.
	 */
	OHCI_CSR_WRITE(sc, OHCI_REG_LinkControlSet,
	    OHCI_LinkControl_CycleTimerEnable |
	    OHCI_LinkControl_RcvSelfID | OHCI_LinkControl_RcvPhyPkt);

	OHCI_CSR_WRITE(sc, OHCI_REG_ATRetries, 0x00000888);	/*XXX*/

	/* clear receive filter */
	OHCI_CSR_WRITE(sc, OHCI_REG_IRMultiChanMaskHiClear, ~0);
	OHCI_CSR_WRITE(sc, OHCI_REG_IRMultiChanMaskLoClear, ~0);
	OHCI_CSR_WRITE(sc, OHCI_REG_AsynchronousRequestFilterHiSet, 0x80000000);

	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlClear,
	    OHCI_HCControl_NoByteSwapData | OHCI_HCControl_APhyEnhanceEnable);
#if BYTE_ORDER == BIG_ENDIAN
	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet,
	    OHCI_HCControl_NoByteSwapData);
#endif

	OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskClear, ~0);
	OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskSet, OHCI_Int_BusReset |
	    OHCI_Int_SelfIDComplete | OHCI_Int_IsochRx | OHCI_Int_IsochTx |
	    OHCI_Int_RSPkt | OHCI_Int_RQPkt | OHCI_Int_ARRS | OHCI_Int_ARRQ |
	    OHCI_Int_RespTxComplete | OHCI_Int_ReqTxComplete);
	OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskSet, OHCI_Int_CycleTooLong |
	    OHCI_Int_UnrecoverableError | OHCI_Int_CycleInconsistent |
	    OHCI_Int_LockRespErr | OHCI_Int_PostedWriteErr);
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoXmitIntMaskSet, ~0);
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoRecvIntMaskSet, ~0);
	OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskSet, OHCI_Int_MasterEnable);

	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet, OHCI_HCControl_LinkEnable);

	/*
	 * Start the receivers
	 */
	fwohci_buf_start_rx(sc);
}

static void
fwohci_power(int why, void *arg)
{
	struct fwohci_softc *sc = arg;
	int s;

	s = splbio();
	switch (why) {
	case PWR_SUSPEND:
	case PWR_STANDBY:
		fwohci_shutdown(sc);
		break;
	case PWR_RESUME:
		fwohci_hw_init(sc);
		fwohci_phy_busreset(sc);
		break;
	case PWR_SOFTSUSPEND:
	case PWR_SOFTSTANDBY:
	case PWR_SOFTRESUME:
		break;
	}
	splx(s);
}

static void
fwohci_shutdown(void *arg)
{
	struct fwohci_softc *sc = arg;
	u_int32_t val;

	callout_stop(&sc->sc_selfid_callout);
	/* disable all interrupt */
	OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskClear, OHCI_Int_MasterEnable);
	fwohci_buf_stop_tx(sc);
	fwohci_buf_stop_rx(sc);
	val = OHCI_CSR_READ(sc, OHCI_REG_BusOptions);
	val &= ~(OHCI_BusOptions_BMC | OHCI_BusOptions_ISC |
		OHCI_BusOptions_CMC | OHCI_BusOptions_IRMC);
	OHCI_CSR_WRITE(sc, OHCI_REG_BusOptions, val);
	fwohci_phy_busreset(sc);
	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlClear, OHCI_HCControl_LinkEnable);
	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlClear, OHCI_HCControl_LPS);
	OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet, OHCI_HCControl_SoftReset);
}

/*
 * COMMON FUNCTIONS
 */

/*
 * read the PHY Register.
 */
static u_int8_t
fwohci_phy_read(struct fwohci_softc *sc, u_int8_t reg)
{
	int i;
	u_int32_t val;

	OHCI_CSR_WRITE(sc, OHCI_REG_PhyControl,
	    OHCI_PhyControl_RdReg | (reg << OHCI_PhyControl_RegAddr_BITPOS));
	for (i = 0; i < OHCI_LOOP; i++) {
		if (OHCI_CSR_READ(sc, OHCI_REG_PhyControl) &
		    OHCI_PhyControl_RdDone)
			break;
		DELAY(10);
	}
	val = OHCI_CSR_READ(sc, OHCI_REG_PhyControl);
	return (val & OHCI_PhyControl_RdData) >> OHCI_PhyControl_RdData_BITPOS;
}

/*
 * write the PHY Register.
 */
static void
fwohci_phy_write(struct fwohci_softc *sc, u_int8_t reg, u_int8_t val)
{
	int i;

	OHCI_CSR_WRITE(sc, OHCI_REG_PhyControl, OHCI_PhyControl_WrReg |
	    (reg << OHCI_PhyControl_RegAddr_BITPOS) |
	    (val << OHCI_PhyControl_WrData_BITPOS));
	for (i = 0; i < OHCI_LOOP; i++) {
		if (!(OHCI_CSR_READ(sc, OHCI_REG_PhyControl) &
		    OHCI_PhyControl_WrReg))
			break;
		DELAY(10);
	}
}

/*
 * Initiate Bus Reset
 */
static void
fwohci_phy_busreset(struct fwohci_softc *sc)
{
	int s;
	u_int8_t val;

	s = splbio();
	OHCI_CSR_WRITE(sc, OHCI_REG_IntEventClear,
	    OHCI_Int_BusReset | OHCI_Int_SelfIDComplete);
	OHCI_CSR_WRITE(sc, OHCI_REG_IntMaskSet, OHCI_Int_BusReset);
	callout_stop(&sc->sc_selfid_callout);
	val = fwohci_phy_read(sc, 1);
	val = (val & 0x80) |			/* preserve RHB (force root) */
	    0x40 |				/* Initiate Bus Reset */
	    0x3f;				/* default GAP count */
	fwohci_phy_write(sc, 1, val);
	splx(s);
}

/*
 * PHY Packet
 */
static void
fwohci_phy_input(struct fwohci_softc *sc, struct fwohci_pkt *pkt)
{
	u_int32_t val;

	val = pkt->fp_hdr[1];
	if (val != ~pkt->fp_hdr[2]) {
		if (val == 0 && ((*pkt->fp_trail & 0x001f0000) >> 16) ==
		    OHCI_CTXCTL_EVENT_BUS_RESET) {
			DPRINTFN(1, ("fwohci_phy_input: BusReset: 0x%08x\n",
			    pkt->fp_hdr[2]));
		} else {
			printf("%s: phy packet corrupted (0x%08x, 0x%08x)\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname, val,
			    pkt->fp_hdr[2]);
		}
		return;
	}
#ifdef FW_DEBUG
	if (fwdebug > 1)
		fwohci_show_phypkt(sc, val);
#endif
}

/*
 * Descriptor for context DMA.
 */
static int
fwohci_desc_alloc(struct fwohci_softc *sc)
{
	int error, mapsize, dsize;

	/*
	 * allocate descriptor buffer
	 */

	sc->sc_descsize = OHCI_BUF_ARRQ_CNT + OHCI_BUF_ARRS_CNT +
	    OHCI_BUF_ATRQ_CNT + OHCI_BUF_ATRS_CNT +
	    OHCI_BUF_IR_CNT * sc->sc_isoctx + 2;
	dsize = sizeof(struct fwohci_desc) * sc->sc_descsize;
	mapsize = howmany(sc->sc_descsize, NBBY);
	sc->sc_descmap = malloc(mapsize, M_DEVBUF, M_WAITOK|M_ZERO);

	if (sc->sc_descmap == NULL) {
		printf("fwohci_desc_alloc: cannot get memory\n");
		return -1;
	}

	if ((error = bus_dmamem_alloc(sc->sc_dmat, dsize, PAGE_SIZE, 0,
	    &sc->sc_dseg, 1, &sc->sc_dnseg, 0)) != 0) {
		printf("%s: unable to allocate descriptor buffer, error = %d\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, error);
		goto fail_0;
	}

	if ((error = bus_dmamem_map(sc->sc_dmat, &sc->sc_dseg, sc->sc_dnseg,
	    dsize, (caddr_t *)&sc->sc_desc, BUS_DMA_COHERENT | BUS_DMA_WAITOK))
	    != 0) {
		printf("%s: unable to map descriptor buffer, error = %d\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, error);
		goto fail_1;
	}

	if ((error = bus_dmamap_create(sc->sc_dmat, dsize, sc->sc_dnseg,
	    dsize, 0, BUS_DMA_WAITOK, &sc->sc_ddmamap)) != 0) {
		printf("%s: unable to create descriptor buffer DMA map, "
		    "error = %d\n", sc->sc_sc1394.sc1394_dev.dv_xname, error);
		goto fail_2;
	}

	if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_ddmamap, sc->sc_desc,
	    dsize, NULL, BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to load descriptor buffer DMA map, "
		    "error = %d\n", sc->sc_sc1394.sc1394_dev.dv_xname, error);
		goto fail_3;
	}

	return 0;

  fail_3:
	bus_dmamap_destroy(sc->sc_dmat, sc->sc_ddmamap);
  fail_2:
	bus_dmamem_unmap(sc->sc_dmat, (caddr_t)sc->sc_desc, dsize);
  fail_1:
	bus_dmamem_free(sc->sc_dmat, &sc->sc_dseg, sc->sc_dnseg);
  fail_0:
	return error;
}

static struct fwohci_desc *
fwohci_desc_get(struct fwohci_softc *sc, int ndesc)
{
	int i, n;

	for (n = 0; n <= sc->sc_descsize - ndesc; n++) {
		for (i = 0; ; i++) {
			if (i == ndesc) {
				for (i = 0; i < ndesc; i++)
					setbit(sc->sc_descmap, n + i);
				return sc->sc_desc + n;
			}
			if (isset(sc->sc_descmap, n + i))
				break;
		}
	}
	return NULL;
}

static void
fwohci_desc_put(struct fwohci_softc *sc, struct fwohci_desc *fd, int ndesc)
{
	int i, n;

	n = fd - sc->sc_desc;
	for (i = 0; i < ndesc; i++, n++) {
#ifdef DIAGNOSTIC
		if (isclr(sc->sc_descmap, n))
			panic("fwohci_desc_put: duplicated free");
#endif
		clrbit(sc->sc_descmap, n);
	}
}

/*
 * Asyncronous/Isochronous Transmit/Receive Context
 */
static int
fwohci_ctx_alloc(struct fwohci_softc *sc, struct fwohci_ctx **fcp,
    int bufcnt, int ctx, int ctxtype)
{
	int i, error;
	struct fwohci_ctx *fc;
	struct fwohci_buf *fb;
	struct fwohci_desc *fd;
#if DOUBLEBUF
	int buf2cnt;
#endif

	fc = malloc(sizeof(*fc), M_DEVBUF, M_WAITOK|M_ZERO);
	LIST_INIT(&fc->fc_handler);
	TAILQ_INIT(&fc->fc_buf);
	fc->fc_ctx = ctx;
	fc->fc_buffers = fb = malloc(sizeof(*fb) * bufcnt, M_DEVBUF, M_WAITOK|M_ZERO);
	fc->fc_bufcnt = bufcnt;
#if DOUBLEBUF
	TAILQ_INIT(&fc->fc_buf2); /* for isochronous */
	if (ctxtype == FWOHCI_CTX_ISO_MULTI) {
		buf2cnt = bufcnt/2;
		bufcnt -= buf2cnt;
		if (buf2cnt == 0) {
			panic("cannot allocate iso buffer");
		}
	}
#endif
	for (i = 0; i < bufcnt; i++, fb++) {
		if ((error = fwohci_buf_alloc(sc, fb)) != 0)
			goto fail;
		if ((fd = fwohci_desc_get(sc, 1)) == NULL) {
			error = ENOBUFS;
			goto fail;
		}
		fb->fb_desc = fd;
		fb->fb_daddr = sc->sc_ddmamap->dm_segs[0].ds_addr +
		    ((caddr_t)fd - (caddr_t)sc->sc_desc);
		fd->fd_flags = OHCI_DESC_INPUT | OHCI_DESC_STATUS |
		    OHCI_DESC_INTR_ALWAYS | OHCI_DESC_BRANCH;
		fd->fd_reqcount = fb->fb_dmamap->dm_segs[0].ds_len;
		fd->fd_data = fb->fb_dmamap->dm_segs[0].ds_addr;
		TAILQ_INSERT_TAIL(&fc->fc_buf, fb, fb_list);
	}
#if DOUBLEBUF
	if (ctxtype == FWOHCI_CTX_ISO_MULTI) {
		for (i = bufcnt; i < bufcnt + buf2cnt; i++, fb++) {
			if ((error = fwohci_buf_alloc(sc, fb)) != 0)
				goto fail;
			if ((fd = fwohci_desc_get(sc, 1)) == NULL) {
				error = ENOBUFS;
				goto fail;
			}
			fb->fb_desc = fd;
			fb->fb_daddr = sc->sc_ddmamap->dm_segs[0].ds_addr +
			    ((caddr_t)fd - (caddr_t)sc->sc_desc);
			bus_dmamap_sync(sc->sc_dmat, sc->sc_ddmamap,
			    (caddr_t)fd - (caddr_t)sc->sc_desc, sizeof(struct fwohci_desc),
			    BUS_DMASYNC_PREWRITE);
			fd->fd_flags = OHCI_DESC_INPUT | OHCI_DESC_STATUS |
			    OHCI_DESC_INTR_ALWAYS | OHCI_DESC_BRANCH;
			fd->fd_reqcount = fb->fb_dmamap->dm_segs[0].ds_len;
			fd->fd_data = fb->fb_dmamap->dm_segs[0].ds_addr;
			TAILQ_INSERT_TAIL(&fc->fc_buf2, fb, fb_list);
			bus_dmamap_sync(sc->sc_dmat, sc->sc_ddmamap,
			    (caddr_t)fd - (caddr_t)sc->sc_desc, sizeof(struct fwohci_desc),
			    BUS_DMASYNC_POSTWRITE);
		}
	}
#endif /* DOUBLEBUF */
	fc->fc_type = ctxtype;
	*fcp = fc;
	return 0;

  fail:
	while (i-- > 0) {
		fb--;
		if (fb->fb_desc)
			fwohci_desc_put(sc, fb->fb_desc, 1);
		fwohci_buf_free(sc, fb);
	}
	free(fc, M_DEVBUF);
	return error;
}

static void
fwohci_ctx_free(struct fwohci_softc *sc, struct fwohci_ctx *fc)
{
	struct fwohci_buf *fb;
	struct fwohci_handler *fh;

#if DOUBLEBUF
	if ((fc->fc_type == FWOHCI_CTX_ISO_MULTI) &&
	    (TAILQ_FIRST(&fc->fc_buf) > TAILQ_FIRST(&fc->fc_buf2))) {
		struct fwohci_buf_s fctmp;

		fctmp = fc->fc_buf;
		fc->fc_buf = fc->fc_buf2;
		fc->fc_buf2 = fctmp;
	}
#endif
	while ((fh = LIST_FIRST(&fc->fc_handler)) != NULL)
		fwohci_handler_set(sc, fh->fh_tcode, fh->fh_key1, fh->fh_key2,
		    NULL, NULL);
	while ((fb = TAILQ_FIRST(&fc->fc_buf)) != NULL) {
		TAILQ_REMOVE(&fc->fc_buf, fb, fb_list);
		if (fb->fb_desc)
			fwohci_desc_put(sc, fb->fb_desc, 1);
		fwohci_buf_free(sc, fb);
	}
#if DOUBLEBUF
	while ((fb = TAILQ_FIRST(&fc->fc_buf2)) != NULL) {
		TAILQ_REMOVE(&fc->fc_buf2, fb, fb_list);
		if (fb->fb_desc)
			fwohci_desc_put(sc, fb->fb_desc, 1);
		fwohci_buf_free(sc, fb);
	}
#endif /* DOUBLEBUF */
	free(fc->fc_buffers, M_DEVBUF);
	free(fc, M_DEVBUF);
}

static void
fwohci_ctx_init(struct fwohci_softc *sc, struct fwohci_ctx *fc)
{
	struct fwohci_buf *fb, *nfb;
	struct fwohci_desc *fd;
	struct fwohci_handler *fh;
	int n;

	for (fb = TAILQ_FIRST(&fc->fc_buf); fb != NULL; fb = nfb) {
		nfb = TAILQ_NEXT(fb, fb_list);
		fb->fb_off = 0;
		fd = fb->fb_desc;
		fd->fd_branch = (nfb != NULL) ? (nfb->fb_daddr | 1) : 0;
		fd->fd_rescount = fd->fd_reqcount;
	}

#if DOUBLEBUF
	for (fb = TAILQ_FIRST(&fc->fc_buf2); fb != NULL; fb = nfb) {
		bus_dmamap_sync(sc->sc_dmat, sc->sc_ddmamap,
		    (caddr_t)fd - (caddr_t)sc->sc_desc, sizeof(struct fwohci_desc),
		    BUS_DMASYNC_PREWRITE);
		nfb = TAILQ_NEXT(fb, fb_list);
		fb->fb_off = 0;
		fd = fb->fb_desc;
		fd->fd_branch = (nfb != NULL) ? (nfb->fb_daddr | 1) : 0;
		fd->fd_rescount = fd->fd_reqcount;
		bus_dmamap_sync(sc->sc_dmat, sc->sc_ddmamap,
		    (caddr_t)fd - (caddr_t)sc->sc_desc, sizeof(struct fwohci_desc),
		    BUS_DMASYNC_POSTWRITE);
	}
#endif /* DOUBLEBUF */

	n = fc->fc_ctx;
	fb = TAILQ_FIRST(&fc->fc_buf);
	if (fc->fc_type != FWOHCI_CTX_ASYNC) {
		OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_CommandPtr,
		    fb->fb_daddr | 1);
		OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_ContextControlClear,
		    OHCI_CTXCTL_RX_BUFFER_FILL |
		    OHCI_CTXCTL_RX_CYCLE_MATCH_ENABLE |
		    OHCI_CTXCTL_RX_MULTI_CHAN_MODE |
		    OHCI_CTXCTL_RX_DUAL_BUFFER_MODE);
		OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_ContextControlSet,
		    OHCI_CTXCTL_RX_ISOCH_HEADER);
		if (fc->fc_type == FWOHCI_CTX_ISO_MULTI) {
			OHCI_SYNC_RX_DMA_WRITE(sc, n,
			    OHCI_SUBREG_ContextControlSet,
			    OHCI_CTXCTL_RX_BUFFER_FILL);
		}
		fh = LIST_FIRST(&fc->fc_handler);

		if (fh->fh_key1 == IEEE1394_ISO_CHANNEL_ANY) {
			OHCI_SYNC_RX_DMA_WRITE(sc, n,
			    OHCI_SUBREG_ContextControlSet,
			    OHCI_CTXCTL_RX_MULTI_CHAN_MODE);

			/* Receive all the isochronous channels */
			OHCI_CSR_WRITE(sc, OHCI_REG_IRMultiChanMaskHiSet,
			    0xffffffff);
			OHCI_CSR_WRITE(sc, OHCI_REG_IRMultiChanMaskLoSet,
			    0xffffffff);
			DPRINTF(("%s: CTXCTL 0x%08x\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname,
			    OHCI_SYNC_RX_DMA_READ(sc, n,
				OHCI_SUBREG_ContextControlSet)));
		}
		OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_ContextMatch,
		    (fh->fh_key2 << OHCI_CTXMATCH_TAG_BITPOS) |
		    (fh->fh_key1 & IEEE1394_ISO_CHANNEL_MASK));
	} else {
		OHCI_ASYNC_DMA_WRITE(sc, n, OHCI_SUBREG_CommandPtr,
		    fb->fb_daddr | 1);
	}
}

/*
 * DMA data buffer
 */
static int
fwohci_buf_alloc(struct fwohci_softc *sc, struct fwohci_buf *fb)
{
	int error;

	if ((error = bus_dmamem_alloc(sc->sc_dmat, PAGE_SIZE, PAGE_SIZE,
	    PAGE_SIZE, &fb->fb_seg, 1, &fb->fb_nseg, BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to allocate buffer, error = %d\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, error);
		goto fail_0;
	}

	if ((error = bus_dmamem_map(sc->sc_dmat, &fb->fb_seg,
	    fb->fb_nseg, PAGE_SIZE, &fb->fb_buf, BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to map buffer, error = %d\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, error);
		goto fail_1;
	}

	if ((error = bus_dmamap_create(sc->sc_dmat, PAGE_SIZE, fb->fb_nseg,
	    PAGE_SIZE, 0, BUS_DMA_WAITOK, &fb->fb_dmamap)) != 0) {
		printf("%s: unable to create buffer DMA map, "
		    "error = %d\n", sc->sc_sc1394.sc1394_dev.dv_xname,
		    error);
		goto fail_2;
	}

	if ((error = bus_dmamap_load(sc->sc_dmat, fb->fb_dmamap,
	    fb->fb_buf, PAGE_SIZE, NULL, BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to load buffer DMA map, "
		    "error = %d\n", sc->sc_sc1394.sc1394_dev.dv_xname,
		    error);
		goto fail_3;
	}

	return 0;

	bus_dmamap_unload(sc->sc_dmat, fb->fb_dmamap);
  fail_3:
	bus_dmamap_destroy(sc->sc_dmat, fb->fb_dmamap);
  fail_2:
	bus_dmamem_unmap(sc->sc_dmat, fb->fb_buf, PAGE_SIZE);
  fail_1:
	bus_dmamem_free(sc->sc_dmat, &fb->fb_seg, fb->fb_nseg);
  fail_0:
	return error;
}

static void
fwohci_buf_free(struct fwohci_softc *sc, struct fwohci_buf *fb)
{

	bus_dmamap_unload(sc->sc_dmat, fb->fb_dmamap);
	bus_dmamap_destroy(sc->sc_dmat, fb->fb_dmamap);
	bus_dmamem_unmap(sc->sc_dmat, fb->fb_buf, PAGE_SIZE);
	bus_dmamem_free(sc->sc_dmat, &fb->fb_seg, fb->fb_nseg);
}

static void
fwohci_buf_init_rx(struct fwohci_softc *sc)
{
	int i;

	/*
	 * Initialize for Asynchronous Receive Queue.
	 */
	fwohci_ctx_init(sc, sc->sc_ctx_arrq);
	fwohci_ctx_init(sc, sc->sc_ctx_arrs);

	/*
	 * Initialize for Isochronous Receive Queue.
	 */
	if (sc->sc_ctx_as != NULL) {
		for (i = 0; i < sc->sc_isoctx; i++) {
			if (sc->sc_ctx_as[i] != NULL)
				fwohci_ctx_init(sc, sc->sc_ctx_as[i]);
		}
	}
}

static void
fwohci_buf_start_rx(struct fwohci_softc *sc)
{
	int i;

	OHCI_ASYNC_DMA_WRITE(sc, OHCI_CTX_ASYNC_RX_REQUEST,
	    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);
	OHCI_ASYNC_DMA_WRITE(sc, OHCI_CTX_ASYNC_RX_RESPONSE,
	    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);
	if (sc->sc_ctx_as != NULL) {
		for (i = 0; i < sc->sc_isoctx; i++) {
			if (sc->sc_ctx_as[i] != NULL)
				OHCI_SYNC_RX_DMA_WRITE(sc, i,
				    OHCI_SUBREG_ContextControlSet,
				    OHCI_CTXCTL_RUN);
		}
	}
}

static void
fwohci_buf_stop_tx(struct fwohci_softc *sc)
{
	int i;

	OHCI_ASYNC_DMA_WRITE(sc, OHCI_CTX_ASYNC_TX_REQUEST,
	    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
	OHCI_ASYNC_DMA_WRITE(sc, OHCI_CTX_ASYNC_TX_RESPONSE,
	    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);

	/*
	 * Make sure the transmitter is stopped.
	 */
	for (i = 0; i < OHCI_LOOP; i++) {
		DELAY(10);
		if (OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_TX_REQUEST,
		    OHCI_SUBREG_ContextControlClear) & OHCI_CTXCTL_ACTIVE)
			continue;
		if (OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_TX_RESPONSE,
		    OHCI_SUBREG_ContextControlClear) & OHCI_CTXCTL_ACTIVE)
			continue;
		break;
	}

	/*
	 * Initialize for Asynchronous Transmit Queue.
	 */
	fwohci_at_done(sc, sc->sc_ctx_atrq, 1);
	fwohci_at_done(sc, sc->sc_ctx_atrs, 1);
}

static void
fwohci_buf_stop_rx(struct fwohci_softc *sc)
{
	int i;

	OHCI_ASYNC_DMA_WRITE(sc, OHCI_CTX_ASYNC_RX_REQUEST,
	    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
	OHCI_ASYNC_DMA_WRITE(sc, OHCI_CTX_ASYNC_RX_RESPONSE,
	    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
	for (i = 0; i < sc->sc_isoctx; i++) {
		OHCI_SYNC_RX_DMA_WRITE(sc, i,
		    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
	}
}

static void
fwohci_buf_next(struct fwohci_softc *sc, struct fwohci_ctx *fc)
{
	struct fwohci_buf *fb, *tfb;

#if DOUBLEBUF
	if (fc->fc_type != FWOHCI_CTX_ISO_MULTI) {
#endif
		while ((fb = TAILQ_FIRST(&fc->fc_buf)) != NULL) {
			if (fc->fc_type) {
				if (fb->fb_off == 0)
					break;
			} else {
				if (fb->fb_off != fb->fb_desc->fd_reqcount ||
				    fb->fb_desc->fd_rescount != 0)
					break;
			}
			TAILQ_REMOVE(&fc->fc_buf, fb, fb_list);
			fb->fb_desc->fd_rescount = fb->fb_desc->fd_reqcount;
			fb->fb_off = 0;
			fb->fb_desc->fd_branch = 0;
			tfb = TAILQ_LAST(&fc->fc_buf, fwohci_buf_s);
			tfb->fb_desc->fd_branch = fb->fb_daddr | 1;
			TAILQ_INSERT_TAIL(&fc->fc_buf, fb, fb_list);
		}
#if DOUBLEBUF
	} else {
		struct fwohci_buf_s fctmp;

		/* cleaning buffer */
		for (fb = TAILQ_FIRST(&fc->fc_buf); fb != NULL;
		     fb = TAILQ_NEXT(fb, fb_list)) {
			fb->fb_off = 0;
			fb->fb_desc->fd_rescount = fb->fb_desc->fd_reqcount;
		}

		/* rotating buffer */
		fctmp = fc->fc_buf;
		fc->fc_buf = fc->fc_buf2;
		fc->fc_buf2 = fctmp;
	}
#endif
}

static int
fwohci_buf_pktget(struct fwohci_softc *sc, struct fwohci_buf **fbp, caddr_t *pp,
    int len)
{
	struct fwohci_buf *fb;
	struct fwohci_desc *fd;
	int bufend;

	fb = *fbp;
  again:
	fd = fb->fb_desc;
	DPRINTFN(1, ("fwohci_buf_pktget: desc %ld, off %d, req %d, res %d,"
	    " len %d, avail %d\n", (long)(fd - sc->sc_desc), fb->fb_off,
	    fd->fd_reqcount, fd->fd_rescount, len,
	    fd->fd_reqcount - fd->fd_rescount - fb->fb_off));
	bufend = fd->fd_reqcount - fd->fd_rescount;
	if (fb->fb_off >= bufend) {
		DPRINTFN(5, ("buf %x finish req %d res %d off %d ",
		    fb->fb_desc->fd_data, fd->fd_reqcount, fd->fd_rescount,
		    fb->fb_off));
		if (fd->fd_rescount == 0) {
			*fbp = fb = TAILQ_NEXT(fb, fb_list);
			if (fb != NULL)
				goto again;
		}
		return 0;
	}
	if (fb->fb_off + len > bufend)
		len = bufend - fb->fb_off;
	bus_dmamap_sync(sc->sc_dmat, fb->fb_dmamap, fb->fb_off, len,
	    BUS_DMASYNC_POSTREAD);
	*pp = fb->fb_buf + fb->fb_off;
	fb->fb_off += roundup(len, 4);
	return len;
}

static int
fwohci_buf_input(struct fwohci_softc *sc, struct fwohci_ctx *fc,
    struct fwohci_pkt *pkt)
{
	caddr_t p;
	struct fwohci_buf *fb;
	int len, count, i;
#ifdef FW_DEBUG
	int tlabel;
#endif

	memset(pkt, 0, sizeof(*pkt));
	pkt->fp_uio.uio_iov = pkt->fp_iov;
	pkt->fp_uio.uio_rw = UIO_WRITE;
	pkt->fp_uio.uio_segflg = UIO_SYSSPACE;

	/* get first quadlet */
	fb = TAILQ_FIRST(&fc->fc_buf);
	count = 4;
	len = fwohci_buf_pktget(sc, &fb, &p, count);
	if (len <= 0) {
		DPRINTFN(1, ("fwohci_buf_input: no input for %d\n",
		    fc->fc_ctx));
		return 0;
	}
	pkt->fp_hdr[0] = *(u_int32_t *)p;
	pkt->fp_tcode = (pkt->fp_hdr[0] & 0x000000f0) >> 4;
	switch (pkt->fp_tcode) {
	case IEEE1394_TCODE_WRITE_REQ_QUAD:
	case IEEE1394_TCODE_READ_RESP_QUAD:
		pkt->fp_hlen = 12;
		pkt->fp_dlen = 4;
		break;
	case IEEE1394_TCODE_READ_REQ_BLOCK:
		pkt->fp_hlen = 16;
		pkt->fp_dlen = 0;
		break;
	case IEEE1394_TCODE_WRITE_REQ_BLOCK:
	case IEEE1394_TCODE_READ_RESP_BLOCK:
	case IEEE1394_TCODE_LOCK_REQ:
	case IEEE1394_TCODE_LOCK_RESP:
		pkt->fp_hlen = 16;
		break;
	case IEEE1394_TCODE_STREAM_DATA:
#ifdef DIAGNOSTIC
		if (fc->fc_type == FWOHCI_CTX_ISO_MULTI)
#endif
		{
			pkt->fp_hlen = 4;
			pkt->fp_dlen = pkt->fp_hdr[0] >> 16;
			DPRINTFN(5, ("[%d]", pkt->fp_dlen));
			break;
		}
#ifdef DIAGNOSTIC
		else {
			printf("fwohci_buf_input: bad tcode: STREAM_DATA\n");
			return 0;
		}
#endif
	default:
		pkt->fp_hlen = 12;
		pkt->fp_dlen = 0;
		break;
	}

	/* get header */
	while (count < pkt->fp_hlen) {
		len = fwohci_buf_pktget(sc, &fb, &p, pkt->fp_hlen - count);
		if (len == 0) {
			printf("fwohci_buf_input: malformed input 1: %d\n",
			    pkt->fp_hlen - count);
			return 0;
		}
		memcpy((caddr_t)pkt->fp_hdr + count, p, len);
		count += len;
	}
	if (pkt->fp_hlen == 16 &&
	    pkt->fp_tcode != IEEE1394_TCODE_READ_REQ_BLOCK)
		pkt->fp_dlen = pkt->fp_hdr[3] >> 16;
#ifdef FW_DEBUG
	tlabel = (pkt->fp_hdr[0] & 0x0000fc00) >> 10;
#endif
	DPRINTFN(1, ("fwohci_buf_input: tcode=0x%x, tlabel=0x%x, hlen=%d, "
	    "dlen=%d\n", pkt->fp_tcode, tlabel, pkt->fp_hlen, pkt->fp_dlen));

	/* get data */
	count = 0;
	i = 0;
	while (count < pkt->fp_dlen) {
		len = fwohci_buf_pktget(sc, &fb,
		    (caddr_t *)&pkt->fp_iov[i].iov_base,
		    pkt->fp_dlen - count);
		if (len == 0) {
			printf("fwohci_buf_input: malformed input 2: %d\n",
			    pkt->fp_dlen - count);
			return 0;
		}
		pkt->fp_iov[i++].iov_len = len;
		count += len;
	}
	pkt->fp_uio.uio_iovcnt = i;
	pkt->fp_uio.uio_resid = count;

	/* get trailer */
	len = fwohci_buf_pktget(sc, &fb, (caddr_t *)&pkt->fp_trail,
	    sizeof(*pkt->fp_trail));
	if (len <= 0) {
		printf("fwohci_buf_input: malformed input 3: %d\n",
		    pkt->fp_hlen - count);
		return 0;
	}
	return 1;
}

static int
fwohci_buf_input_ppb(struct fwohci_softc *sc, struct fwohci_ctx *fc,
    struct fwohci_pkt *pkt)
{
	caddr_t p;
	int len;
	struct fwohci_buf *fb;
	struct fwohci_desc *fd;

	if (fc->fc_type ==  FWOHCI_CTX_ISO_MULTI) {
		return fwohci_buf_input(sc, fc, pkt);
	}

	memset(pkt, 0, sizeof(*pkt));
	pkt->fp_uio.uio_iov = pkt->fp_iov;
	pkt->fp_uio.uio_rw = UIO_WRITE;
	pkt->fp_uio.uio_segflg = UIO_SYSSPACE;

	for (fb = TAILQ_FIRST(&fc->fc_buf); ; fb = TAILQ_NEXT(fb, fb_list)) {
		if (fb == NULL)
			return 0;
		if (fb->fb_off == 0)
			break;
	}
	fd = fb->fb_desc;
	len = fd->fd_reqcount - fd->fd_rescount;
	if (len == 0)
		return 0;
	bus_dmamap_sync(sc->sc_dmat, fb->fb_dmamap, fb->fb_off, len,
	    BUS_DMASYNC_POSTREAD);

	p = fb->fb_buf;
	fb->fb_off += roundup(len, 4);
	if (len < 8) {
		printf("fwohci_buf_input_ppb: malformed input 1: %d\n", len);
		return 0;
	}

	/*
	 * get trailer first, may be bogus data unless status update
	 * in descriptor is set.
	 */
	pkt->fp_trail = (u_int32_t *)p;
	*pkt->fp_trail = (*pkt->fp_trail & 0xffff) | (fd->fd_status << 16);
	pkt->fp_hdr[0] = ((u_int32_t *)p)[1];
	pkt->fp_tcode = (pkt->fp_hdr[0] & 0x000000f0) >> 4;
#ifdef DIAGNOSTIC
	if (pkt->fp_tcode != IEEE1394_TCODE_STREAM_DATA) {
		printf("fwohci_buf_input_ppb: bad tcode: 0x%x\n",
		    pkt->fp_tcode);
		return 0;
	}
#endif
	pkt->fp_hlen = 4;
	pkt->fp_dlen = pkt->fp_hdr[0] >> 16;
	p += 8;
	len -= 8;
	if (pkt->fp_dlen != len) {
		printf("fwohci_buf_input_ppb: malformed input 2: %d != %d\n",
		    pkt->fp_dlen, len);
		return 0;
	}
	DPRINTFN(1, ("fwohci_buf_input_ppb: tcode=0x%x, hlen=%d, dlen=%d\n",
	    pkt->fp_tcode, pkt->fp_hlen, pkt->fp_dlen));
	pkt->fp_iov[0].iov_base = p;
	pkt->fp_iov[0].iov_len = len;
	pkt->fp_uio.uio_iovcnt = 0;
	pkt->fp_uio.uio_resid = len;
	return 1;
}

static int
fwohci_handler_set(struct fwohci_softc *sc,
    int tcode, u_int32_t key1, u_int32_t key2,
    int (*handler)(struct fwohci_softc *, void *, struct fwohci_pkt *),
    void *arg)
{
	struct fwohci_ctx *fc;
	struct fwohci_handler *fh;
	int i, j;

	if (tcode == IEEE1394_TCODE_STREAM_DATA &&
	    (((key1 & OHCI_ASYNC_STREAM) && sc->sc_ctx_as != NULL)
		    || (key1 & OHCI_ASYNC_STREAM) == 0)) {
		int isasync = key1 & OHCI_ASYNC_STREAM;

		key1 = key1 & IEEE1394_ISO_CHANNEL_ANY ?
		    IEEE1394_ISO_CHANNEL_ANY : (key1 & IEEE1394_ISOCH_MASK);
		if (key1 & IEEE1394_ISO_CHANNEL_ANY) {
			printf("%s: key changed to %x\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname, key1);
		}
		j = sc->sc_isoctx;
		fh = NULL;

		for (i = 0; i < sc->sc_isoctx; i++) {
			if ((fc = sc->sc_ctx_as[i]) == NULL) {
				if (j == sc->sc_isoctx)
					j = i;
				continue;
			}
			fh = LIST_FIRST(&fc->fc_handler);
			if (fh->fh_tcode == tcode &&
			    fh->fh_key1 == key1 && fh->fh_key2 == key2)
				break;
			fh = NULL;
		}
		if (fh == NULL) {
			if (handler == NULL)
				return 0;
			if (j == sc->sc_isoctx) {
				DPRINTF(("fwohci_handler_set: no more free "
				    "context\n"));
				return ENOMEM;
			}
			if ((fc = sc->sc_ctx_as[j]) == NULL) {
				fwohci_ctx_alloc(sc, &fc, OHCI_BUF_IR_CNT, j,
				    isasync ? FWOHCI_CTX_ISO_SINGLE :
				    FWOHCI_CTX_ISO_MULTI);
				sc->sc_ctx_as[j] = fc;
			}
		}
#ifdef FW_DEBUG
		if (fh == NULL && handler != NULL) {
			printf("use ir context %d\n", j);
		} else if (fh != NULL && handler == NULL) {
			printf("remove ir context %d\n", i);
		}
#endif
	} else {
		switch (tcode) {
		case IEEE1394_TCODE_WRITE_REQ_QUAD:
		case IEEE1394_TCODE_WRITE_REQ_BLOCK:
		case IEEE1394_TCODE_READ_REQ_QUAD:
		case IEEE1394_TCODE_READ_REQ_BLOCK:
		case IEEE1394_TCODE_LOCK_REQ:
			fc = sc->sc_ctx_arrq;
			break;
		case IEEE1394_TCODE_WRITE_RESP:
		case IEEE1394_TCODE_READ_RESP_QUAD:
		case IEEE1394_TCODE_READ_RESP_BLOCK:
		case IEEE1394_TCODE_LOCK_RESP:
			fc = sc->sc_ctx_arrs;
			break;
		default:
			return EIO;
		}
		for (fh = LIST_FIRST(&fc->fc_handler); fh != NULL;
		    fh = LIST_NEXT(fh, fh_list)) {
			if (fh->fh_tcode == tcode &&
			    fh->fh_key1 == key1 && fh->fh_key2 == key2)
				break;
		}
	}
	if (handler == NULL) {
		if (fh != NULL) {
			LIST_REMOVE(fh, fh_list);
			free(fh, M_DEVBUF);
		}
		if (tcode == IEEE1394_TCODE_STREAM_DATA) {
			OHCI_SYNC_RX_DMA_WRITE(sc, fc->fc_ctx,
			    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
			sc->sc_ctx_as[fc->fc_ctx] = NULL;
			fwohci_ctx_free(sc, fc);
		}
		return 0;
	}
	if (fh == NULL) {
		fh = malloc(sizeof(*fh), M_DEVBUF, M_WAITOK);
		LIST_INSERT_HEAD(&fc->fc_handler, fh, fh_list);
	}
	fh->fh_tcode = tcode;
	fh->fh_key1 = key1;
	fh->fh_key2 = key2;
	fh->fh_handler = handler;
	fh->fh_handarg = arg;
	DPRINTFN(1, ("fwohci_handler_set: ctx %d, tcode %x, key 0x%x, 0x%x\n",
	    fc->fc_ctx, tcode, key1, key2));

	if (tcode == IEEE1394_TCODE_STREAM_DATA) {
		fwohci_ctx_init(sc, fc);
		DPRINTFN(1, ("fwohci_handler_set: SYNC desc %ld\n",
		    (long)(TAILQ_FIRST(&fc->fc_buf)->fb_desc - sc->sc_desc)));
		OHCI_SYNC_RX_DMA_WRITE(sc, fc->fc_ctx,
		    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);
	}
	return 0;
}





/*
 * static ieee1394_ir_tag_t
 * fwohci_ir_ctx_set(struct device *dev, int channel, int tagbm,
 *	int bufnum, int maxsize, int flags)
 *
 *	This function will return non-negative value if it succeeds.
 *	This return value is pointer to the context of isochronous
 *	transmission.  This function will return NULL value if it
 *	fails.
 */
ieee1394_ir_tag_t
fwohci_ir_ctx_set(struct device *dev, int channel, int tagbm,
    int bufnum, int maxsize, int flags)
{
	int i, openctx;
	struct fwohci_ir_ctx *irc;
	struct fwohci_softc *sc = (struct fwohci_softc *)dev;
	const char *xname = sc->sc_sc1394.sc1394_dev.dv_xname;

	printf("%s: ir_ctx_set channel %d tagbm 0x%x maxsize %d bufnum %d\n",
	    xname, channel, tagbm, maxsize, bufnum);
	/*
	 * This loop will find the smallest vacant context and check
	 * whether other channel uses the same channel.
	 */
	openctx = sc->sc_isoctx;
	for (i = 0; i < sc->sc_isoctx; ++i) {
		if (sc->sc_ctx_ir[i] == NULL) {
			/*
			 * Find a vacant contet.  If this has the
			 * smallest context number, register it.
			 */
			if (openctx == sc->sc_isoctx) {
				openctx = i;
			}
		} else {
			/*
			 * This context is used.  Check whether this
			 * context uses the same channel as ours.
			 */
			if (sc->sc_ctx_ir[i]->irc_channel == channel) {
				/* Using same channel. */
				printf("%s: channel %d occupied by ctx%d\n",
				    xname, channel, i);
				return NULL;
			}
		}
	}

	/*
	 * If there is a vacant context, allocate isochronous transmit
	 * context for it.
	 */
	if (openctx != sc->sc_isoctx) {
		printf("%s using ctx %d for iso receive\n", xname, openctx);
		if ((irc = fwohci_ir_ctx_construct(sc, openctx, channel,
		    tagbm, bufnum, maxsize, flags)) == NULL) {
			return NULL;
		}
#ifndef IR_CTX_OPENTEST
		sc->sc_ctx_ir[openctx] = irc;
#else
		fwohci_ir_ctx_destruct(irc);
		irc = NULL;
#endif
	} else {
		printf("%s: cannot find any vacant contexts\n", xname);
		irc = NULL;
	}

	return (ieee1394_ir_tag_t)irc;
}


/*
 * int fwohci_ir_ctx_clear(struct device *dev, ieee1394_ir_tag_t *ir)
 *
 *	This function will return 0 if it succeed.  Otherwise return
 *	negative value.
 */
int
fwohci_ir_ctx_clear(struct device *dev, ieee1394_ir_tag_t ir)
{
	struct fwohci_ir_ctx *irc = (struct fwohci_ir_ctx *)ir;
	struct fwohci_softc *sc = irc->irc_sc;
	int i;

	if (sc->sc_ctx_ir[irc->irc_num] != irc) {
		printf("fwohci_ir_ctx_clear: irc differs %p %p\n",
		    sc->sc_ctx_ir[irc->irc_num], irc);
		return -1;
	}

	i = 0;
	while (irc->irc_status & IRC_STATUS_RUN) {
		tsleep((void *)irc, PWAIT|PCATCH, "IEEE1394 iso receive", 100);
		if (irc->irc_status & IRC_STATUS_RUN) {
			if (fwohci_ir_stop(irc) == 0) {
				irc->irc_status &= ~IRC_STATUS_RUN;
			}

		}
		if (++i > 20) {
			u_int32_t reg
			    = OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
				OHCI_SUBREG_ContextControlSet);

			printf("fwochi_ir_ctx_clear: "
			    "Cannot stop iso receive engine\n");
			printf("%s:  intr IR_CommandPtr 0x%08x "
			    "ContextCtrl 0x%08x%s%s%s%s\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname,
			    OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
				OHCI_SUBREG_CommandPtr),
			    reg,
			    reg & OHCI_CTXCTL_RUN ? " run" : "",
			    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
			    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
			    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");

			return EBUSY;
		}
	}

	printf("fwohci_ir_ctx_clear: DMA engine is stopped. get %d frames max queuelen %d pos %d\n",
	    irc->irc_pktcount, irc->irc_maxqueuelen, irc->irc_maxqueuepos);

	fwohci_ir_ctx_destruct(irc);

	sc->sc_ctx_ir[irc->irc_num] = NULL;

	return 0;
}








ieee1394_it_tag_t
fwohci_it_set(struct ieee1394_softc *isc, int channel, int tagbm)
{
	ieee1394_it_tag_t rv;
	int tag;

	for (tag = 0; tagbm != 0 && (tagbm & 0x01) == 0; tagbm >>= 1, ++tag);

	rv = fwohci_it_ctx_set((struct fwohci_softc *)isc, channel, tag, 488);

	return rv;
}

/*
 * static ieee1394_it_tag_t
 * fwohci_it_ctx_set(struct fwohci_softc *sc,
 *    u_int32_t key1 (channel), u_int32_t key2 (tag), int maxsize)
 *
 *	This function will return non-negative value if it succeeds.
 *	This return value is pointer to the context of isochronous
 *	transmission.  This function will return NULL value if it
 *	fails.
 */
static ieee1394_it_tag_t
fwohci_it_ctx_set(struct fwohci_softc *sc, int channel, int tag, int maxsize)
{
	int i, openctx;
	struct fwohci_it_ctx *itc;
	const char *xname = sc->sc_sc1394.sc1394_dev.dv_xname;
#ifdef TEST_CHAIN
	extern int fwohci_test_chain(struct fwohci_it_ctx *);
#endif /* TEST_CHAIN */
#ifdef TEST_WRITE
	extern void fwohci_test_write(struct fwohci_it_ctx *itc);
#endif /* TEST_WRITE */

	printf("%s: it_ctx_set channel %d tag %d maxsize %d\n",
	    xname, channel, tag, maxsize);

	/*
	 * This loop will find the smallest vacant context and check
	 * whether other channel uses the same channel.
	 */
	openctx = sc->sc_itctx;
	for (i = 0; i < sc->sc_itctx; ++i) {
		if (sc->sc_ctx_it[i] == NULL) {
			/*
			 * Find a vacant contet.  If this has the
			 * smallest context number, register it.
			 */
			if (openctx == sc->sc_itctx) {
				openctx = i;
			}
		} else {
			/*
			 * This context is used.  Check whether this
			 * context uses the same channel as ours.
			 */
			if (sc->sc_ctx_it[i]->itc_channel == channel) {
				/* Using same channel. */
				printf("%s: channel %d occupied by ctx%d\n",
				    xname, channel, i);
				return NULL;
			}
		}
	}

	/*
	 * If there is a vacant context, allocate isochronous transmit
	 * context for it.
	 */
	if (openctx != sc->sc_itctx) {
		printf("%s using ctx %d for iso trasmit\n", xname, openctx);
		if ((itc = fwohci_it_ctx_construct(sc, openctx, channel,
		    tag, maxsize)) == NULL) {
			return NULL;
		}
		sc->sc_ctx_it[openctx] = itc;

#ifdef TEST_CHAIN
		fwohci_test_chain(itc);
#endif /* TEST_CHAIN */
#ifdef TEST_WRITE
		fwohci_test_write(itc);
		itc = NULL;
#endif /* TEST_WRITE */

	} else {
		printf("%s: cannot find any vacant contexts\n", xname);
		itc = NULL;
	}

	return (ieee1394_it_tag_t)itc;
}


/*
 * int fwohci_it_ctx_clear(ieee1394_it_tag_t *it)
 *
 *	This function will return 0 if it succeed.  Otherwise return
 *	negative value.
 */
int
fwohci_it_ctx_clear(ieee1394_it_tag_t *it)
{
	struct fwohci_it_ctx *itc = (struct fwohci_it_ctx *)it;
	struct fwohci_softc *sc = itc->itc_sc;
	int i;

	if (sc->sc_ctx_it[itc->itc_num] != itc) {
		printf("fwohci_it_ctx_clear: itc differs %p %p\n",
		    sc->sc_ctx_it[itc->itc_num], itc);
		return -1;
	}

	fwohci_it_ctx_flush(it);

	i = 0;
	while (itc->itc_flags & ITC_FLAGS_RUN) {
		tsleep((void *)itc, PWAIT|PCATCH, "IEEE1394 iso transmit", 100);
		if (itc->itc_flags & ITC_FLAGS_RUN) {
			u_int32_t reg;

			reg = OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num,
			    OHCI_SUBREG_ContextControlSet);

			if ((reg & OHCI_CTXCTL_WAKE) == 0) {
				itc->itc_flags &= ~ITC_FLAGS_RUN;
				printf("fwochi_it_ctx_clear: "
				    "DMA engine stopped without intr\n");
			}
			printf("%s: %d intr IT_CommandPtr 0x%08x "
			    "ContextCtrl 0x%08x%s%s%s%s\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname, i,
			    OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num,
				OHCI_SUBREG_CommandPtr),
			    reg,
			    reg & OHCI_CTXCTL_RUN ? " run" : "",
			    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
			    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
			    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");


		}
		if (++i > 20) {
			u_int32_t reg
			    = OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num,
				OHCI_SUBREG_ContextControlSet);

			printf("fwochi_it_ctx_clear: "
			    "Cannot stop iso transmit engine\n");
			printf("%s:  intr IT_CommandPtr 0x%08x "
			    "ContextCtrl 0x%08x%s%s%s%s\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname,
			    OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num,
				OHCI_SUBREG_CommandPtr),
			    reg,
			    reg & OHCI_CTXCTL_RUN ? " run" : "",
			    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
			    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
			    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");

			return EBUSY;
		}
	}

	printf("fwohci_it_ctx_clear: DMA engine is stopped.\n");

	fwohci_it_ctx_destruct(itc);

	sc->sc_ctx_it[itc->itc_num] = NULL;


	return 0;
}






/*
 * Asyncronous Receive Requests input frontend.
 */
static void
fwohci_arrq_input(struct fwohci_softc *sc, struct fwohci_ctx *fc)
{
	int rcode;
	u_int32_t key1, key2;
	struct fwohci_handler *fh;
	struct fwohci_pkt pkt, res;

	/*
	 * Do not return if next packet is in the buffer, or the next
	 * packet cannot be received until the next receive interrupt.
	 */
	while (fwohci_buf_input(sc, fc, &pkt)) {
		if (pkt.fp_tcode == OHCI_TCODE_PHY) {
			fwohci_phy_input(sc, &pkt);
			continue;
		}
		key1 = pkt.fp_hdr[1] & 0xffff;
		key2 = pkt.fp_hdr[2];
		memset(&res, 0, sizeof(res));
		res.fp_uio.uio_rw = UIO_WRITE;
		res.fp_uio.uio_segflg = UIO_SYSSPACE;
		for (fh = LIST_FIRST(&fc->fc_handler); fh != NULL;
		    fh = LIST_NEXT(fh, fh_list)) {
			if (pkt.fp_tcode == fh->fh_tcode &&
			    key1 == fh->fh_key1 &&
			    key2 == fh->fh_key2) {
				rcode = (*fh->fh_handler)(sc, fh->fh_handarg,
				    &pkt);
				break;
			}
		}
		if (fh == NULL) {
			rcode = IEEE1394_RCODE_ADDRESS_ERROR;
			DPRINTFN(1, ("fwohci_arrq_input: no listener: tcode "
			    "0x%x, addr=0x%04x %08x\n", pkt.fp_tcode, key1,
			    key2));
		}
		if (((*pkt.fp_trail & 0x001f0000) >> 16) !=
		    OHCI_CTXCTL_EVENT_ACK_PENDING)
			continue;
		if (rcode != -1)
			fwohci_atrs_output(sc, rcode, &pkt, &res);
	}
	fwohci_buf_next(sc, fc);
	OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
	    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_WAKE);
}


/*
 * Asynchronous Receive Response input frontend.
 */
static void
fwohci_arrs_input(struct fwohci_softc *sc, struct fwohci_ctx *fc)
{
	struct fwohci_pkt pkt;
	struct fwohci_handler *fh;
	u_int16_t srcid;
	int rcode, tlabel;

	while (fwohci_buf_input(sc, fc, &pkt)) {
		srcid = pkt.fp_hdr[1] >> 16;
		rcode = (pkt.fp_hdr[1] & 0x0000f000) >> 12;
		tlabel = (pkt.fp_hdr[0] & 0x0000fc00) >> 10;
		DPRINTFN(1, ("fwohci_arrs_input: tcode 0x%x, from 0x%04x,"
		    " tlabel 0x%x, rcode 0x%x, hlen %d, dlen %d\n",
		    pkt.fp_tcode, srcid, tlabel, rcode, pkt.fp_hlen,
		    pkt.fp_dlen));
		for (fh = LIST_FIRST(&fc->fc_handler); fh != NULL;
		    fh = LIST_NEXT(fh, fh_list)) {
			if (pkt.fp_tcode == fh->fh_tcode &&
			    (srcid & OHCI_NodeId_NodeNumber) == fh->fh_key1 &&
			    tlabel == fh->fh_key2) {
				(*fh->fh_handler)(sc, fh->fh_handarg, &pkt);
				LIST_REMOVE(fh, fh_list);
				free(fh, M_DEVBUF);
				break;
			}
		}
		if (fh == NULL)
			DPRINTFN(1, ("fwohci_arrs_input: no listner\n"));
	}
	fwohci_buf_next(sc, fc);
	OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
	    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_WAKE);
}

/*
 * Isochronous Receive input frontend.
 */
static void
fwohci_as_input(struct fwohci_softc *sc, struct fwohci_ctx *fc)
{
	int rcode, chan, tag;
	struct iovec *iov;
	struct fwohci_handler *fh;
	struct fwohci_pkt pkt;

#if DOUBLEBUF
	if (fc->fc_type == FWOHCI_CTX_ISO_MULTI) {
		struct fwohci_buf *fb;
		int i;
		u_int32_t reg;

		/* stop dma engine before read buffer */
		reg = OHCI_SYNC_RX_DMA_READ(sc, fc->fc_ctx,
		    OHCI_SUBREG_ContextControlClear);
		DPRINTFN(5, ("ir_input %08x =>", reg));
		if (reg & OHCI_CTXCTL_RUN) {
			OHCI_SYNC_RX_DMA_WRITE(sc, fc->fc_ctx,
			    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
		}
		DPRINTFN(5, (" %08x\n", OHCI_SYNC_RX_DMA_READ(sc, fc->fc_ctx, OHCI_SUBREG_ContextControlClear)));

		i = 0;
		while ((reg = OHCI_SYNC_RX_DMA_READ(sc, fc->fc_ctx, OHCI_SUBREG_ContextControlSet)) & OHCI_CTXCTL_ACTIVE) {
			delay(10);
			if (++i > 10000) {
				printf("cannot stop dma engine 0x%08x\n", reg);
				return;
			}
		}

		/* rotate dma buffer */
		fb = TAILQ_FIRST(&fc->fc_buf2);
		OHCI_SYNC_RX_DMA_WRITE(sc, fc->fc_ctx, OHCI_SUBREG_CommandPtr,
		    fb->fb_daddr | 1);
		/* start dma engine */
		OHCI_SYNC_RX_DMA_WRITE(sc, fc->fc_ctx,
		    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);
		OHCI_CSR_WRITE(sc, OHCI_REG_IsoRecvIntEventClear,
		    (1 << fc->fc_ctx));
	}
#endif

	while (fwohci_buf_input_ppb(sc, fc, &pkt)) {
		chan = (pkt.fp_hdr[0] & 0x00003f00) >> 8;
		tag  = (pkt.fp_hdr[0] & 0x0000c000) >> 14;
		DPRINTFN(1, ("fwohci_as_input: hdr 0x%08x, tcode 0x%0x, hlen %d"
		    ", dlen %d\n", pkt.fp_hdr[0], pkt.fp_tcode, pkt.fp_hlen,
		    pkt.fp_dlen));
		if (tag == IEEE1394_TAG_GASP &&
		    fc->fc_type == FWOHCI_CTX_ISO_SINGLE) {
			/*
			 * The pkt with tag=3 is GASP format.
			 * Move GASP header to header part.
			 */
			if (pkt.fp_dlen < 8)
				continue;
			iov = pkt.fp_iov;
			/* assuming pkt per buffer mode */
			pkt.fp_hdr[1] = ntohl(((u_int32_t *)iov->iov_base)[0]);
			pkt.fp_hdr[2] = ntohl(((u_int32_t *)iov->iov_base)[1]);
			iov->iov_base = (caddr_t)iov->iov_base + 8;
			iov->iov_len -= 8;
			pkt.fp_hlen += 8;
			pkt.fp_dlen -= 8;
		}
		for (fh = LIST_FIRST(&fc->fc_handler); fh != NULL;
		    fh = LIST_NEXT(fh, fh_list)) {
			if (pkt.fp_tcode == fh->fh_tcode &&
			    (chan == fh->fh_key1 ||
				fh->fh_key1 == IEEE1394_ISO_CHANNEL_ANY) &&
			    ((1 << tag) & fh->fh_key2) != 0) {
				rcode = (*fh->fh_handler)(sc, fh->fh_handarg,
				    &pkt);
				break;
			}
		}
#ifdef FW_DEBUG
		if (fh == NULL) {
			DPRINTFN(1, ("fwohci_as_input: no handler\n"));
		} else {
			DPRINTFN(1, ("fwohci_as_input: rcode %d\n", rcode));
		}
#endif
	}
	fwohci_buf_next(sc, fc);

	if (fc->fc_type == FWOHCI_CTX_ISO_SINGLE) {
		OHCI_SYNC_RX_DMA_WRITE(sc, fc->fc_ctx,
		    OHCI_SUBREG_ContextControlSet,
		    OHCI_CTXCTL_WAKE);
	}
}

/*
 * Asynchronous Transmit common routine.
 */
static int
fwohci_at_output(struct fwohci_softc *sc, struct fwohci_ctx *fc,
    struct fwohci_pkt *pkt)
{
	struct fwohci_buf *fb;
	struct fwohci_desc *fd;
	struct mbuf *m, *m0;
	int i, ndesc, error, off, len;
	u_int32_t val;
#ifdef FW_DEBUG
	struct iovec *iov;
        int tlabel = (pkt->fp_hdr[0] & 0x0000fc00) >> 10;
#endif

	if ((sc->sc_nodeid & OHCI_NodeId_NodeNumber) == IEEE1394_BCAST_PHY_ID)
		/* We can't send anything during selfid duration */
		return EAGAIN;

#ifdef FW_DEBUG
	DPRINTFN(1, ("fwohci_at_output: tcode 0x%x, tlabel 0x%x hlen %d, "
	    "dlen %d", pkt->fp_tcode, tlabel, pkt->fp_hlen, pkt->fp_dlen));
	for (i = 0; i < pkt->fp_hlen/4; i++)
		DPRINTFN(2, ("%s%08x", i?" ":"\n    ", pkt->fp_hdr[i]));
	DPRINTFN(2, ("$"));
	for (ndesc = 0, iov = pkt->fp_iov;
	     ndesc < pkt->fp_uio.uio_iovcnt; ndesc++, iov++) {
		for (i = 0; i < iov->iov_len; i++)
			DPRINTFN(2, ("%s%02x", (i%32)?((i%4)?"":" "):"\n    ",
			    ((u_int8_t *)iov->iov_base)[i]));
		DPRINTFN(2, ("$"));
	}
	DPRINTFN(1, ("\n"));
#endif

	if ((m = pkt->fp_m) != NULL) {
		for (ndesc = 2; m != NULL; m = m->m_next)
			ndesc++;
		if (ndesc > OHCI_DESC_MAX) {
			m0 = NULL;
			ndesc = 2;
			for (off = 0; off < pkt->fp_dlen; off += len) {
				if (m0 == NULL) {
					MGETHDR(m0, M_DONTWAIT, MT_DATA);
					if (m0 != NULL)
						M_COPY_PKTHDR(m0, pkt->fp_m);
					m = m0;
				} else {
					MGET(m->m_next, M_DONTWAIT, MT_DATA);
					m = m->m_next;
				}
				if (m != NULL)
					MCLGET(m, M_DONTWAIT);
				if (m == NULL || (m->m_flags & M_EXT) == 0) {
					m_freem(m0);
					return ENOMEM;
				}
				len = pkt->fp_dlen - off;
				if (len > m->m_ext.ext_size)
					len = m->m_ext.ext_size;
				m_copydata(pkt->fp_m, off, len,
				    mtod(m, caddr_t));
				m->m_len = len;
				ndesc++;
			}
			m_freem(pkt->fp_m);
			pkt->fp_m = m0;
		}
	} else
		ndesc = 2 + pkt->fp_uio.uio_iovcnt;

	if (ndesc > OHCI_DESC_MAX)
		return ENOBUFS;

	if (fc->fc_bufcnt > 50)			/*XXX*/
		return ENOBUFS;
	fb = malloc(sizeof(*fb), M_DEVBUF, M_WAITOK);
	fb->fb_nseg = ndesc;
	fb->fb_desc = fwohci_desc_get(sc, ndesc);
	if (fb->fb_desc == NULL) {
		free(fb, M_DEVBUF);
		return ENOBUFS;
	}
	fb->fb_daddr = sc->sc_ddmamap->dm_segs[0].ds_addr +
	    ((caddr_t)fb->fb_desc - (caddr_t)sc->sc_desc);
	fb->fb_m = pkt->fp_m;
	fb->fb_callback = pkt->fp_callback;
	fb->fb_statuscb = pkt->fp_statuscb;
	fb->fb_statusarg = pkt->fp_statusarg;

	if (ndesc > 2) {
		if ((error = bus_dmamap_create(sc->sc_dmat, pkt->fp_dlen, ndesc,
		    PAGE_SIZE, 0, BUS_DMA_WAITOK, &fb->fb_dmamap)) != 0) {
			fwohci_desc_put(sc, fb->fb_desc, ndesc);
			free(fb, M_DEVBUF);
			return error;
		}

		if (pkt->fp_m != NULL)
			error = bus_dmamap_load_mbuf(sc->sc_dmat, fb->fb_dmamap,
			    pkt->fp_m, BUS_DMA_WAITOK);
		else
			error = bus_dmamap_load_uio(sc->sc_dmat, fb->fb_dmamap,
			    &pkt->fp_uio, BUS_DMA_WAITOK);
		if (error != 0) {
			bus_dmamap_destroy(sc->sc_dmat, fb->fb_dmamap);
			fwohci_desc_put(sc, fb->fb_desc, ndesc);
			free(fb, M_DEVBUF);
			return error;
		}
		bus_dmamap_sync(sc->sc_dmat, fb->fb_dmamap, 0, pkt->fp_dlen,
		    BUS_DMASYNC_PREWRITE);
	}

	fd = fb->fb_desc;
	fd->fd_flags = OHCI_DESC_IMMED;
	fd->fd_reqcount = pkt->fp_hlen;
	fd->fd_data = 0;
	fd->fd_branch = 0;
	fd->fd_status = 0;
	if (fc->fc_ctx == OHCI_CTX_ASYNC_TX_RESPONSE) {
		i = 3;				/* XXX: 3 sec */
		val = OHCI_CSR_READ(sc, OHCI_REG_IsochronousCycleTimer);
		fd->fd_timestamp = ((val >> 12) & 0x1fff) |
		    ((((val >> 25) + i) & 0x7) << 13);
	} else
		fd->fd_timestamp = 0;
	memcpy(fd + 1, pkt->fp_hdr, pkt->fp_hlen);
	for (i = 0; i < ndesc - 2; i++) {
		fd = fb->fb_desc + 2 + i;
		fd->fd_flags = 0;
		fd->fd_reqcount = fb->fb_dmamap->dm_segs[i].ds_len;
		fd->fd_data = fb->fb_dmamap->dm_segs[i].ds_addr;
		fd->fd_branch = 0;
		fd->fd_status = 0;
		fd->fd_timestamp = 0;
	}
	fd->fd_flags |= OHCI_DESC_LAST | OHCI_DESC_BRANCH;
	fd->fd_flags |= OHCI_DESC_INTR_ALWAYS;

#ifdef FW_DEBUG
	DPRINTFN(1, ("fwohci_at_output: desc %ld",
	    (long)(fb->fb_desc - sc->sc_desc)));
	for (i = 0; i < ndesc * 4; i++)
		DPRINTFN(2, ("%s%08x", i&7?" ":"\n    ",
		    ((u_int32_t *)fb->fb_desc)[i]));
	DPRINTFN(1, ("\n"));
#endif

	val = OHCI_ASYNC_DMA_READ(sc, fc->fc_ctx,
	    OHCI_SUBREG_ContextControlClear);

	if (val & OHCI_CTXCTL_RUN) {
		if (fc->fc_branch == NULL) {
			OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
			    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
			goto run;
		}
		*fc->fc_branch = fb->fb_daddr | ndesc;
		OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
		    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_WAKE);
	} else {
  run:
		OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
		    OHCI_SUBREG_CommandPtr, fb->fb_daddr | ndesc);
		OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
		    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);
	}
	fc->fc_branch = &fd->fd_branch;

	fc->fc_bufcnt++;
	TAILQ_INSERT_TAIL(&fc->fc_buf, fb, fb_list);
	pkt->fp_m = NULL;
	return 0;
}

static void
fwohci_at_done(struct fwohci_softc *sc, struct fwohci_ctx *fc, int force)
{
	struct fwohci_buf *fb;
	struct fwohci_desc *fd;
	struct fwohci_pkt pkt;
	int i;

	while ((fb = TAILQ_FIRST(&fc->fc_buf)) != NULL) {
		fd = fb->fb_desc;
#ifdef FW_DEBUG
		DPRINTFN(1, ("fwohci_at_done: %sdesc %ld (%d)",
		    force ? "force " : "", (long)(fd - sc->sc_desc),
		    fb->fb_nseg));
		for (i = 0; i < fb->fb_nseg * 4; i++)
			DPRINTFN(2, ("%s%08x", i&7?" ":"\n    ",
			    ((u_int32_t *)fd)[i]));
		DPRINTFN(1, ("\n"));
#endif
		if (fb->fb_nseg > 2)
			fd += fb->fb_nseg - 1;
		if (!force && !(fd->fd_status & OHCI_CTXCTL_ACTIVE))
			break;
		TAILQ_REMOVE(&fc->fc_buf, fb, fb_list);
		if (fc->fc_branch == &fd->fd_branch) {
			OHCI_ASYNC_DMA_WRITE(sc, fc->fc_ctx,
			    OHCI_SUBREG_ContextControlClear, OHCI_CTXCTL_RUN);
			fc->fc_branch = NULL;
			for (i = 0; i < OHCI_LOOP; i++) {
				if (!(OHCI_ASYNC_DMA_READ(sc, fc->fc_ctx,
				    OHCI_SUBREG_ContextControlClear) &
				    OHCI_CTXCTL_ACTIVE))
					break;
				DELAY(10);
			}
		}

		if (fb->fb_statuscb) {
			memset(&pkt, 0, sizeof(pkt));
			pkt.fp_status = fd->fd_status;
			memcpy(pkt.fp_hdr, fd + 1, sizeof(pkt.fp_hdr[0]));

			/* Indicate this is just returning the status bits. */
			pkt.fp_tcode = -1;
			(*fb->fb_statuscb)(sc, fb->fb_statusarg, &pkt);
			fb->fb_statuscb = NULL;
			fb->fb_statusarg = NULL;
		}
		fwohci_desc_put(sc, fb->fb_desc, fb->fb_nseg);
		if (fb->fb_nseg > 2)
			bus_dmamap_destroy(sc->sc_dmat, fb->fb_dmamap);
		fc->fc_bufcnt--;
		if (fb->fb_callback) {
			(*fb->fb_callback)(sc->sc_sc1394.sc1394_if, fb->fb_m);
			fb->fb_callback = NULL;
		} else if (fb->fb_m != NULL)
			m_freem(fb->fb_m);
		free(fb, M_DEVBUF);
	}
}

/*
 * Asynchronous Transmit Reponse -- in response of request packet.
 */
static void
fwohci_atrs_output(struct fwohci_softc *sc, int rcode, struct fwohci_pkt *req,
    struct fwohci_pkt *res)
{

	if (((*req->fp_trail & 0x001f0000) >> 16) !=
	    OHCI_CTXCTL_EVENT_ACK_PENDING)
		return;

	res->fp_hdr[0] = (req->fp_hdr[0] & 0x0000fc00) | 0x00000100;
	res->fp_hdr[1] = (req->fp_hdr[1] & 0xffff0000) | (rcode << 12);
	switch (req->fp_tcode) {
	case IEEE1394_TCODE_WRITE_REQ_QUAD:
	case IEEE1394_TCODE_WRITE_REQ_BLOCK:
		res->fp_tcode = IEEE1394_TCODE_WRITE_RESP;
		res->fp_hlen = 12;
		break;
	case IEEE1394_TCODE_READ_REQ_QUAD:
		res->fp_tcode = IEEE1394_TCODE_READ_RESP_QUAD;
		res->fp_hlen = 16;
		res->fp_dlen = 0;
		if (res->fp_uio.uio_iovcnt == 1 && res->fp_iov[0].iov_len == 4)
			res->fp_hdr[3] =
			    *(u_int32_t *)res->fp_iov[0].iov_base;
		res->fp_uio.uio_iovcnt = 0;
		break;
	case IEEE1394_TCODE_READ_REQ_BLOCK:
	case IEEE1394_TCODE_LOCK_REQ:
		if (req->fp_tcode == IEEE1394_TCODE_LOCK_REQ)
			res->fp_tcode = IEEE1394_TCODE_LOCK_RESP;
		else
			res->fp_tcode = IEEE1394_TCODE_READ_RESP_BLOCK;
		res->fp_hlen = 16;
		res->fp_dlen = res->fp_uio.uio_resid;
		res->fp_hdr[3] = res->fp_dlen << 16;
		break;
	}
	res->fp_hdr[0] |= (res->fp_tcode << 4);
	fwohci_at_output(sc, sc->sc_ctx_atrs, res);
}

/*
 * APPLICATION LAYER SERVICES
 */

/*
 * Retrieve Global UID from GUID ROM
 */
static int
fwohci_guidrom_init(struct fwohci_softc *sc)
{
	int i, n, off;
	u_int32_t val1, val2;

	/* Extract the Global UID
	 */
	val1 = OHCI_CSR_READ(sc, OHCI_REG_GUIDHi);
	val2 = OHCI_CSR_READ(sc, OHCI_REG_GUIDLo);

	if (val1 != 0 || val2 != 0) {
		sc->sc_sc1394.sc1394_guid[0] = (val1 >> 24) & 0xff;
		sc->sc_sc1394.sc1394_guid[1] = (val1 >> 16) & 0xff;
		sc->sc_sc1394.sc1394_guid[2] = (val1 >>  8) & 0xff;
		sc->sc_sc1394.sc1394_guid[3] = (val1 >>  0) & 0xff;
		sc->sc_sc1394.sc1394_guid[4] = (val2 >> 24) & 0xff;
		sc->sc_sc1394.sc1394_guid[5] = (val2 >> 16) & 0xff;
		sc->sc_sc1394.sc1394_guid[6] = (val2 >>  8) & 0xff;
		sc->sc_sc1394.sc1394_guid[7] = (val2 >>  0) & 0xff;
	} else {
		val1 = OHCI_CSR_READ(sc, OHCI_REG_Version);
		if ((val1 & OHCI_Version_GUID_ROM) == 0)
			return -1;
		OHCI_CSR_WRITE(sc, OHCI_REG_Guid_Rom, OHCI_Guid_AddrReset);
		for (i = 0; i < OHCI_LOOP; i++) {
			val1 = OHCI_CSR_READ(sc, OHCI_REG_Guid_Rom);
			if (!(val1 & OHCI_Guid_AddrReset))
				break;
			DELAY(10);
		}
		off = OHCI_BITVAL(val1, OHCI_Guid_MiniROM) + 4;
		val2 = 0;
		for (n = 0; n < off + sizeof(sc->sc_sc1394.sc1394_guid); n++) {
			OHCI_CSR_WRITE(sc, OHCI_REG_Guid_Rom,
			    OHCI_Guid_RdStart);
			for (i = 0; i < OHCI_LOOP; i++) {
				val1 = OHCI_CSR_READ(sc, OHCI_REG_Guid_Rom);
				if (!(val1 & OHCI_Guid_RdStart))
					break;
				DELAY(10);
			}
			if (n < off)
				continue;
			val1 = OHCI_BITVAL(val1, OHCI_Guid_RdData);
			sc->sc_sc1394.sc1394_guid[n - off] = val1;
			val2 |= val1;
		}
		if (val2 == 0)
			return -1;
	}
	return 0;
}

/*
 * Initialization for Configuration ROM (no DMA context)
 */

#define	CFR_MAXUNIT		20

struct configromctx {
	u_int32_t	*ptr;
	int		curunit;
	struct {
		u_int32_t	*start;
		int		length;
		u_int32_t	*refer;
		int		refunit;
	} unit[CFR_MAXUNIT];
};

#define	CFR_PUT_DATA4(cfr, d1, d2, d3, d4)				\
	(*(cfr)->ptr++ = (((d1)<<24) | ((d2)<<16) | ((d3)<<8) | (d4)))

#define	CFR_PUT_DATA1(cfr, d)	(*(cfr)->ptr++ = (d))

#define	CFR_PUT_VALUE(cfr, key, d)	(*(cfr)->ptr++ = ((key)<<24) | (d))

#define	CFR_PUT_CRC(cfr, n)						\
	(*(cfr)->unit[n].start = ((cfr)->unit[n].length << 16) |	\
	    fwohci_crc16((cfr)->unit[n].start + 1, (cfr)->unit[n].length))

#define	CFR_START_UNIT(cfr, n)						\
do {									\
	if ((cfr)->unit[n].refer != NULL) {				\
		*(cfr)->unit[n].refer |=				\
		    (cfr)->ptr - (cfr)->unit[n].refer;			\
		CFR_PUT_CRC(cfr, (cfr)->unit[n].refunit);		\
	}								\
	(cfr)->curunit = (n);						\
	(cfr)->unit[n].start = (cfr)->ptr++;				\
} while (0 /* CONSTCOND */)

#define	CFR_PUT_REFER(cfr, key, n)					\
do {									\
	(cfr)->unit[n].refer = (cfr)->ptr;				\
	(cfr)->unit[n].refunit = (cfr)->curunit;			\
	*(cfr)->ptr++ = (key) << 24;					\
} while (0 /* CONSTCOND */)

#define	CFR_END_UNIT(cfr)						\
do {									\
	(cfr)->unit[(cfr)->curunit].length = (cfr)->ptr -		\
	    ((cfr)->unit[(cfr)->curunit].start + 1);			\
	CFR_PUT_CRC(cfr, (cfr)->curunit);				\
} while (0 /* CONSTCOND */)

static u_int16_t
fwohci_crc16(u_int32_t *ptr, int len)
{
	int shift;
	u_int32_t crc, sum, data;

	crc = 0;
	while (len-- > 0) {
		data = *ptr++;
		for (shift = 28; shift >= 0; shift -= 4) {
			sum = ((crc >> 12) ^ (data >> shift)) & 0x000f;
			crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ sum;
		}
		crc &= 0xffff;
	}
	return crc;
}

static void
fwohci_configrom_init(struct fwohci_softc *sc)
{
	int i, val;
	struct fwohci_buf *fb;
	u_int32_t *hdr;
	struct configromctx cfr;

	fb = &sc->sc_buf_cnfrom;
	memset(&cfr, 0, sizeof(cfr));
	cfr.ptr = hdr = (u_int32_t *)fb->fb_buf;

	/* headers */
	CFR_START_UNIT(&cfr, 0);
	CFR_PUT_DATA1(&cfr, OHCI_CSR_READ(sc, OHCI_REG_BusId));
	CFR_PUT_DATA1(&cfr, OHCI_CSR_READ(sc, OHCI_REG_BusOptions));
	CFR_PUT_DATA1(&cfr, OHCI_CSR_READ(sc, OHCI_REG_GUIDHi));
	CFR_PUT_DATA1(&cfr, OHCI_CSR_READ(sc, OHCI_REG_GUIDLo));
	CFR_END_UNIT(&cfr);
	/* copy info_length from crc_length */
	*hdr |= (*hdr & 0x00ff0000) << 8;
	OHCI_CSR_WRITE(sc, OHCI_REG_ConfigROMhdr, *hdr);

	/* root directory */
	CFR_START_UNIT(&cfr, 1);
	CFR_PUT_VALUE(&cfr, 0x03, 0x00005e);	/* vendor id */
	CFR_PUT_REFER(&cfr, 0x81, 2);		/* textual descriptor offset */
	CFR_PUT_VALUE(&cfr, 0x0c, 0x0083c0);	/* node capability */
						/* spt,64,fix,lst,drq */
#ifdef INET
	CFR_PUT_REFER(&cfr, 0xd1, 3);		/* IPv4 unit directory */
#endif /* INET */
#ifdef INET6
	CFR_PUT_REFER(&cfr, 0xd1, 4);		/* IPv6 unit directory */
#endif /* INET6 */
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 2);
	CFR_PUT_VALUE(&cfr, 0, 0);		/* textual descriptor */
	CFR_PUT_DATA1(&cfr, 0);			/* minimal ASCII */
	CFR_PUT_DATA4(&cfr, 'N', 'e', 't', 'B');
	CFR_PUT_DATA4(&cfr, 'S', 'D', 0x00, 0x00);
	CFR_END_UNIT(&cfr);

#ifdef INET
	/* IPv4 unit directory */
	CFR_START_UNIT(&cfr, 3);
	CFR_PUT_VALUE(&cfr, 0x12, 0x00005e);	/* unit spec id */
	CFR_PUT_REFER(&cfr, 0x81, 6);		/* textual descriptor offset */
	CFR_PUT_VALUE(&cfr, 0x13, 0x000001);	/* unit sw version */
	CFR_PUT_REFER(&cfr, 0x81, 7);		/* textual descriptor offset */
	CFR_PUT_REFER(&cfr, 0x95, 8);		/* Unit location */
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 6);
	CFR_PUT_VALUE(&cfr, 0, 0);		/* textual descriptor */
	CFR_PUT_DATA1(&cfr, 0);			/* minimal ASCII */
	CFR_PUT_DATA4(&cfr, 'I', 'A', 'N', 'A');
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 7);
	CFR_PUT_VALUE(&cfr, 0, 0);		/* textual descriptor */
	CFR_PUT_DATA1(&cfr, 0);			/* minimal ASCII */
	CFR_PUT_DATA4(&cfr, 'I', 'P', 'v', '4');
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 8);		/* Spec's valid addr range. */
	CFR_PUT_DATA1(&cfr, FW_FIFO_HI);
	CFR_PUT_DATA1(&cfr, (FW_FIFO_LO | 0x1));
	CFR_PUT_DATA1(&cfr, FW_FIFO_HI);
	CFR_PUT_DATA1(&cfr, FW_FIFO_LO);
	CFR_END_UNIT(&cfr);

#endif /* INET */

#ifdef INET6
	/* IPv6 unit directory */
	CFR_START_UNIT(&cfr, 4);
	CFR_PUT_VALUE(&cfr, 0x12, 0x00005e);	/* unit spec id */
	CFR_PUT_REFER(&cfr, 0x81, 9);		/* textual descriptor offset */
	CFR_PUT_VALUE(&cfr, 0x13, 0x000002);	/* unit sw version */
						/* XXX: TBA by IANA */
	CFR_PUT_REFER(&cfr, 0x81, 10);		/* textual descriptor offset */
	CFR_PUT_REFER(&cfr, 0x95, 11);		/* Unit location */
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 9);
	CFR_PUT_VALUE(&cfr, 0, 0);		/* textual descriptor */
	CFR_PUT_DATA1(&cfr, 0);			/* minimal ASCII */
	CFR_PUT_DATA4(&cfr, 'I', 'A', 'N', 'A');
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 10);
	CFR_PUT_VALUE(&cfr, 0, 0);		/* textual descriptor */
	CFR_PUT_DATA1(&cfr, 0);
	CFR_PUT_DATA4(&cfr, 'I', 'P', 'v', '6');
	CFR_END_UNIT(&cfr);

	CFR_START_UNIT(&cfr, 11);		/* Spec's valid addr range. */
	CFR_PUT_DATA1(&cfr, FW_FIFO_HI);
	CFR_PUT_DATA1(&cfr, (FW_FIFO_LO | 0x1));
	CFR_PUT_DATA1(&cfr, FW_FIFO_HI);
	CFR_PUT_DATA1(&cfr, FW_FIFO_LO);
	CFR_END_UNIT(&cfr);

#endif /* INET6 */

	fb->fb_off = cfr.ptr - hdr;
#ifdef FW_DEBUG
	DPRINTF(("%s: Config ROM:", sc->sc_sc1394.sc1394_dev.dv_xname));
	for (i = 0; i < fb->fb_off; i++)
		DPRINTF(("%s%08x", i&7?" ":"\n    ", hdr[i]));
	DPRINTF(("\n"));
#endif /* FW_DEBUG */

	/*
	 * Make network byte order for DMA
	 */
	for (i = 0; i < fb->fb_off; i++)
		HTONL(hdr[i]);
	bus_dmamap_sync(sc->sc_dmat, fb->fb_dmamap, 0,
	    (caddr_t)cfr.ptr - fb->fb_buf, BUS_DMASYNC_PREWRITE);

	OHCI_CSR_WRITE(sc, OHCI_REG_ConfigROMmap,
	    fb->fb_dmamap->dm_segs[0].ds_addr);

	/* This register is only valid on OHCI 1.1. */
	val = OHCI_CSR_READ(sc, OHCI_REG_Version);
	if ((OHCI_Version_GET_Version(val) == 1) &&
	    (OHCI_Version_GET_Revision(val) == 1))
		OHCI_CSR_WRITE(sc, OHCI_REG_HCControlSet,
		    OHCI_HCControl_BIBImageValid);

	/* Just allow quad reads of the rom. */
	for (i = 0; i < fb->fb_off; i++)
		fwohci_handler_set(sc, IEEE1394_TCODE_READ_REQ_QUAD,
		    CSR_BASE_HI, CSR_BASE_LO + CSR_CONFIG_ROM + (i * 4),
		    fwohci_configrom_input, NULL);
}

static int
fwohci_configrom_input(struct fwohci_softc *sc, void *arg,
    struct fwohci_pkt *pkt)
{
	struct fwohci_pkt res;
	u_int32_t loc, *rom;

	/* This will be used as an array index so size accordingly. */
	loc = pkt->fp_hdr[2] - (CSR_BASE_LO + CSR_CONFIG_ROM);
	if ((loc & 0x03) != 0) {
		/* alignment error */
		return IEEE1394_RCODE_ADDRESS_ERROR;
	}
	else
		loc /= 4;
	rom = (u_int32_t *)sc->sc_buf_cnfrom.fb_buf;

	DPRINTFN(1, ("fwohci_configrom_input: ConfigRom[0x%04x]: 0x%08x\n", loc,
	    ntohl(rom[loc])));

	memset(&res, 0, sizeof(res));
	res.fp_hdr[3] = rom[loc];
	fwohci_atrs_output(sc, IEEE1394_RCODE_COMPLETE, pkt, &res);
	return -1;
}

/*
 * SelfID buffer (no DMA context)
 */
static void
fwohci_selfid_init(struct fwohci_softc *sc)
{
	struct fwohci_buf *fb;

	fb = &sc->sc_buf_selfid;
#ifdef DIAGNOSTIC
	if ((fb->fb_dmamap->dm_segs[0].ds_addr & 0x7ff) != 0)
		panic("fwohci_selfid_init: not aligned: %ld (%ld) %p",
		    (unsigned long)fb->fb_dmamap->dm_segs[0].ds_addr,
		    (unsigned long)fb->fb_dmamap->dm_segs[0].ds_len, fb->fb_buf);
#endif
	memset(fb->fb_buf, 0, fb->fb_dmamap->dm_segs[0].ds_len);
	bus_dmamap_sync(sc->sc_dmat, fb->fb_dmamap, 0,
	    fb->fb_dmamap->dm_segs[0].ds_len, BUS_DMASYNC_PREREAD);

	OHCI_CSR_WRITE(sc, OHCI_REG_SelfIDBuffer,
	    fb->fb_dmamap->dm_segs[0].ds_addr);
}

static int
fwohci_selfid_input(struct fwohci_softc *sc)
{
	int i;
	u_int32_t count, val, gen;
	u_int32_t *buf;

	buf = (u_int32_t *)sc->sc_buf_selfid.fb_buf;
	val = OHCI_CSR_READ(sc, OHCI_REG_SelfIDCount);
  again:
	if (val & OHCI_SelfID_Error) {
		printf("%s: SelfID Error\n", sc->sc_sc1394.sc1394_dev.dv_xname);
		return -1;
	}
	count = OHCI_BITVAL(val, OHCI_SelfID_Size);

	bus_dmamap_sync(sc->sc_dmat, sc->sc_buf_selfid.fb_dmamap,
	    0, count << 2, BUS_DMASYNC_POSTREAD);
	gen = OHCI_BITVAL(buf[0], OHCI_SelfID_Gen);

#ifdef FW_DEBUG
	DPRINTFN(1, ("%s: SelfID: 0x%08x", sc->sc_sc1394.sc1394_dev.dv_xname,
	    val));
	for (i = 0; i < count; i++)
		DPRINTFN(2, ("%s%08x", i&7?" ":"\n    ", buf[i]));
	DPRINTFN(1, ("\n"));
#endif /* FW_DEBUG */

	for (i = 1; i < count; i += 2) {
		if (buf[i] != ~buf[i + 1])
			break;
		if (buf[i] & 0x00000001)
			continue;	/* more pkt */
		if (buf[i] & 0x00800000)
			continue;	/* external id */
		sc->sc_rootid = (buf[i] & 0x3f000000) >> 24;
		if ((buf[i] & 0x00400800) == 0x00400800)
			sc->sc_irmid = sc->sc_rootid;
	}

	val = OHCI_CSR_READ(sc, OHCI_REG_SelfIDCount);
	if (OHCI_BITVAL(val, OHCI_SelfID_Gen) != gen) {
		if (OHCI_BITVAL(val, OHCI_SelfID_Gen) !=
		    OHCI_BITVAL(buf[0], OHCI_SelfID_Gen))
			goto again;
		DPRINTF(("%s: SelfID Gen mismatch (%d, %d)\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, gen,
		    OHCI_BITVAL(val, OHCI_SelfID_Gen)));
		return -1;
	}
	if (i != count) {
		printf("%s: SelfID corrupted (%d, 0x%08x, 0x%08x)\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, i, buf[i], buf[i + 1]);
#if 1
		if (i == 1 && buf[i] == 0 && buf[i + 1] == 0) {
			/*
			 * XXX: CXD3222 sometimes fails to DMA
			 * selfid packet??
			 */
			sc->sc_rootid = (count - 1) / 2 - 1;
			sc->sc_irmid = sc->sc_rootid;
		} else
#endif
		return -1;
	}

	val = OHCI_CSR_READ(sc, OHCI_REG_NodeId);
	if ((val & OHCI_NodeId_IDValid) == 0) {
		sc->sc_nodeid = 0xffff;		/* invalid */
		printf("%s: nodeid is invalid\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
		return -1;
	}
	sc->sc_nodeid = val & 0xffff;

	DPRINTF(("%s: nodeid=0x%04x(%d), rootid=%d, irmid=%d\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname, sc->sc_nodeid,
	    sc->sc_nodeid & OHCI_NodeId_NodeNumber, sc->sc_rootid,
	    sc->sc_irmid));

	if ((sc->sc_nodeid & OHCI_NodeId_NodeNumber) > sc->sc_rootid)
		return -1;

	if ((sc->sc_nodeid & OHCI_NodeId_NodeNumber) == sc->sc_rootid)
		OHCI_CSR_WRITE(sc, OHCI_REG_LinkControlSet,
		    OHCI_LinkControl_CycleMaster);
	else
		OHCI_CSR_WRITE(sc, OHCI_REG_LinkControlClear,
		    OHCI_LinkControl_CycleMaster);
	return 0;
}

/*
 * some CSRs are handled by driver.
 */
static void
fwohci_csr_init(struct fwohci_softc *sc)
{
	int i;
	static u_int32_t csr[] = {
	    CSR_STATE_CLEAR, CSR_STATE_SET, CSR_SB_CYCLE_TIME,
	    CSR_SB_BUS_TIME, CSR_SB_BUSY_TIMEOUT, CSR_SB_BUS_MANAGER_ID,
	    CSR_SB_CHANNEL_AVAILABLE_HI, CSR_SB_CHANNEL_AVAILABLE_LO,
	    CSR_SB_BROADCAST_CHANNEL
	};

	for (i = 0; i < sizeof(csr) / sizeof(csr[0]); i++) {
		fwohci_handler_set(sc, IEEE1394_TCODE_WRITE_REQ_QUAD,
		    CSR_BASE_HI, CSR_BASE_LO + csr[i], fwohci_csr_input, NULL);
		fwohci_handler_set(sc, IEEE1394_TCODE_READ_REQ_QUAD,
		    CSR_BASE_HI, CSR_BASE_LO + csr[i], fwohci_csr_input, NULL);
	}
	sc->sc_csr[CSR_SB_BROADCAST_CHANNEL] = 31;	/*XXX*/
}

static int
fwohci_csr_input(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *pkt)
{
	struct fwohci_pkt res;
	u_int32_t reg;

	/*
	 * XXX need to do special functionality other than just r/w...
	 */
	reg = pkt->fp_hdr[2] - CSR_BASE_LO;

	if ((reg & 0x03) != 0) {
		/* alignment error */
		return IEEE1394_RCODE_ADDRESS_ERROR;
	}
	DPRINTFN(1, ("fwohci_csr_input: CSR[0x%04x]: 0x%08x", reg,
	    *(u_int32_t *)(&sc->sc_csr[reg])));
	if (pkt->fp_tcode == IEEE1394_TCODE_WRITE_REQ_QUAD) {
		DPRINTFN(1, (" -> 0x%08x\n",
		    ntohl(*(u_int32_t *)pkt->fp_iov[0].iov_base)));
		*(u_int32_t *)&sc->sc_csr[reg] =
		    ntohl(*(u_int32_t *)pkt->fp_iov[0].iov_base);
	} else {
		DPRINTFN(1, ("\n"));
		res.fp_hdr[3] = htonl(*(u_int32_t *)&sc->sc_csr[reg]);
		res.fp_iov[0].iov_base = &res.fp_hdr[3];
		res.fp_iov[0].iov_len = 4;
		res.fp_uio.uio_resid = 4;
		res.fp_uio.uio_iovcnt = 1;
		fwohci_atrs_output(sc, IEEE1394_RCODE_COMPLETE, pkt, &res);
		return -1;
	}
	return IEEE1394_RCODE_COMPLETE;
}

/*
 * Mapping between nodeid and unique ID (EUI-64).
 *
 * Track old mappings and simply update their devices with the new id's when
 * they match an existing EUI. This allows proper renumeration of the bus.
 */
static void
fwohci_uid_collect(struct fwohci_softc *sc)
{
	int i;
	struct fwohci_uidtbl *fu;
	struct ieee1394_softc *iea;

	LIST_FOREACH(iea, &sc->sc_nodelist, sc1394_node)
		iea->sc1394_node_id = 0xffff;

	if (sc->sc_uidtbl != NULL)
		free(sc->sc_uidtbl, M_DEVBUF);
	sc->sc_uidtbl = malloc(sizeof(*fu) * (sc->sc_rootid + 1), M_DEVBUF,
	    M_NOWAIT|M_ZERO);	/* XXX M_WAITOK requires locks */
	if (sc->sc_uidtbl == NULL)
		return;

	for (i = 0, fu = sc->sc_uidtbl; i <= sc->sc_rootid; i++, fu++) {
		if (i == (sc->sc_nodeid & OHCI_NodeId_NodeNumber)) {
			memcpy(fu->fu_uid, sc->sc_sc1394.sc1394_guid, 8);
			fu->fu_valid = 3;

			iea = (struct ieee1394_softc *)sc->sc_sc1394.sc1394_if;
			if (iea) {
				iea->sc1394_node_id = i;
				DPRINTF(("%s: Updating nodeid to %d\n",
				    iea->sc1394_dev.dv_xname,
				    iea->sc1394_node_id));
			}
		} else {
			fu->fu_valid = 0;
			fwohci_uid_req(sc, i);
		}
	}
	if (sc->sc_rootid == 0)
		fwohci_check_nodes(sc);
}

static void
fwohci_uid_req(struct fwohci_softc *sc, int phyid)
{
	struct fwohci_pkt pkt;

	memset(&pkt, 0, sizeof(pkt));
	pkt.fp_tcode = IEEE1394_TCODE_READ_REQ_QUAD;
	pkt.fp_hlen = 12;
	pkt.fp_dlen = 0;
	pkt.fp_hdr[0] = 0x00000100 | (sc->sc_tlabel << 10) |
	    (pkt.fp_tcode << 4);
	pkt.fp_hdr[1] = ((0xffc0 | phyid) << 16) | CSR_BASE_HI;
	pkt.fp_hdr[2] = CSR_BASE_LO + CSR_CONFIG_ROM + 12;
	fwohci_handler_set(sc, IEEE1394_TCODE_READ_RESP_QUAD, phyid,
	    sc->sc_tlabel, fwohci_uid_input, (void *)0);
	sc->sc_tlabel = (sc->sc_tlabel + 1) & 0x3f;
	fwohci_at_output(sc, sc->sc_ctx_atrq, &pkt);

	pkt.fp_hdr[0] = 0x00000100 | (sc->sc_tlabel << 10) |
	    (pkt.fp_tcode << 4);
	pkt.fp_hdr[2] = CSR_BASE_LO + CSR_CONFIG_ROM + 16;
	fwohci_handler_set(sc, IEEE1394_TCODE_READ_RESP_QUAD, phyid,
	    sc->sc_tlabel, fwohci_uid_input, (void *)1);
	sc->sc_tlabel = (sc->sc_tlabel + 1) & 0x3f;
	fwohci_at_output(sc, sc->sc_ctx_atrq, &pkt);
}

static int
fwohci_uid_input(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *res)
{
	struct fwohci_uidtbl *fu;
	struct ieee1394_softc *iea;
	struct ieee1394_attach_args fwa;
	int i, n, done, rcode, found;

	found = 0;

	n = (res->fp_hdr[1] >> 16) & OHCI_NodeId_NodeNumber;
	rcode = (res->fp_hdr[1] & 0x0000f000) >> 12;
	if (rcode != IEEE1394_RCODE_COMPLETE ||
	    sc->sc_uidtbl == NULL ||
	    n > sc->sc_rootid)
		return 0;
	fu = &sc->sc_uidtbl[n];
	if (arg == 0) {
		memcpy(fu->fu_uid, res->fp_iov[0].iov_base, 4);
		fu->fu_valid |= 0x1;
	} else {
		memcpy(fu->fu_uid + 4, res->fp_iov[0].iov_base, 4);
		fu->fu_valid |= 0x2;
	}
#ifdef FW_DEBUG
	if (fu->fu_valid == 0x3)
		DPRINTFN(1, ("fwohci_uid_input: "
		    "Node %d, UID %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", n,
		    fu->fu_uid[0], fu->fu_uid[1], fu->fu_uid[2], fu->fu_uid[3],
		    fu->fu_uid[4], fu->fu_uid[5], fu->fu_uid[6], fu->fu_uid[7]));
#endif
	if (fu->fu_valid == 0x3) {
		LIST_FOREACH(iea, &sc->sc_nodelist, sc1394_node)
			if (memcmp(iea->sc1394_guid, fu->fu_uid, 8) == 0) {
				found = 1;
				iea->sc1394_node_id = n;
				DPRINTF(("%s: Updating nodeid to %d\n",
				    iea->sc1394_dev.dv_xname,
				    iea->sc1394_node_id));
				if (iea->sc1394_callback.sc1394_reset)
					iea->sc1394_callback.sc1394_reset(iea,
					    iea->sc1394_callback.sc1394_resetarg);
				break;
			}
		if (!found) {
			strcpy(fwa.name, "fwnode");
			memcpy(fwa.uid, fu->fu_uid, 8);
			fwa.nodeid = n;
			iea = (struct ieee1394_softc *)
			    config_found_sm(&sc->sc_sc1394.sc1394_dev, &fwa,
			    fwohci_print, fwohci_submatch);
			if (iea != NULL)
				LIST_INSERT_HEAD(&sc->sc_nodelist, iea,
				    sc1394_node);
		}
	}
	done = 1;

	for (i = 0; i < sc->sc_rootid + 1; i++) {
		fu = &sc->sc_uidtbl[i];
		if (fu->fu_valid != 0x3) {
			done = 0;
			break;
		}
	}
	if (done)
		fwohci_check_nodes(sc);

	return 0;
}

static void
fwohci_check_nodes(struct fwohci_softc *sc)
{
	struct device *detach = NULL;
	struct ieee1394_softc *iea;

	LIST_FOREACH(iea, &sc->sc_nodelist, sc1394_node) {

		/*
		 * Have to defer detachment until the next
		 * loop iteration since config_detach
		 * free's the softc and the loop iterator
		 * needs data from the softc to move
		 * forward.
		 */

		if (detach) {
			config_detach(detach, 0);
			detach = NULL;
		}
		if (iea->sc1394_node_id == 0xffff) {
			detach = (struct device *)iea;
			LIST_REMOVE(iea, sc1394_node);
		}
	}
	if (detach)
		config_detach(detach, 0);
}

static int
fwohci_uid_lookup(struct fwohci_softc *sc, const u_int8_t *uid)
{
	struct fwohci_uidtbl *fu;
	int n;
	static const u_int8_t bcast[] =
	    { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

	fu = sc->sc_uidtbl;
	if (fu == NULL) {
		if (memcmp(uid, bcast, sizeof(bcast)) == 0)
			return IEEE1394_BCAST_PHY_ID;
		fwohci_uid_collect(sc); /* try to get */
		return -1;
	}
	for (n = 0; n <= sc->sc_rootid; n++, fu++) {
		if (fu->fu_valid == 0x3 && memcmp(fu->fu_uid, uid, 8) == 0)
			return n;
	}
	if (memcmp(uid, bcast, sizeof(bcast)) == 0)
		return IEEE1394_BCAST_PHY_ID;
	for (n = 0, fu = sc->sc_uidtbl; n <= sc->sc_rootid; n++, fu++) {
		if (fu->fu_valid != 0x3) {
			/*
			 * XXX: need timer before retransmission
			 */
			fwohci_uid_req(sc, n);
		}
	}
	return -1;
}

/*
 * functions to support network interface
 */
static int
fwohci_if_inreg(struct device *self, u_int32_t offhi, u_int32_t offlo,
    void (*handler)(struct device *, struct mbuf *))
{
	struct fwohci_softc *sc = (struct fwohci_softc *)self;

	fwohci_handler_set(sc, IEEE1394_TCODE_WRITE_REQ_BLOCK, offhi, offlo,
	    handler ? fwohci_if_input : NULL, handler);
	fwohci_handler_set(sc, IEEE1394_TCODE_STREAM_DATA,
	    (sc->sc_csr[CSR_SB_BROADCAST_CHANNEL] & IEEE1394_ISOCH_MASK) |
	    OHCI_ASYNC_STREAM,
	    1 << IEEE1394_TAG_GASP,
	    handler ? fwohci_if_input : NULL, handler);
	return 0;
}

static int
fwohci_if_input(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *pkt)
{
	int n, len;
	struct mbuf *m;
	struct iovec *iov;
	void (*handler)(struct device *, struct mbuf *) = arg;

#ifdef FW_DEBUG
	int i;
	DPRINTFN(1, ("fwohci_if_input: tcode=0x%x, dlen=%d", pkt->fp_tcode,
	    pkt->fp_dlen));
	for (i = 0; i < pkt->fp_hlen/4; i++)
		DPRINTFN(2, ("%s%08x", i?" ":"\n    ", pkt->fp_hdr[i]));
	DPRINTFN(2, ("$"));
	for (n = 0, len = pkt->fp_dlen; len > 0; len -= i, n++){
		iov = &pkt->fp_iov[n];
		for (i = 0; i < iov->iov_len; i++)
			DPRINTFN(2, ("%s%02x", (i%32)?((i%4)?"":" "):"\n    ",
			    ((u_int8_t *)iov->iov_base)[i]));
		DPRINTFN(2, ("$"));
	}
	DPRINTFN(1, ("\n"));
#endif /* FW_DEBUG */
	len = pkt->fp_dlen;
	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m == NULL)
		return IEEE1394_RCODE_COMPLETE;
	m->m_len = 16;
	if (len + m->m_len > MHLEN) {
		MCLGET(m, M_DONTWAIT);
		if ((m->m_flags & M_EXT) == 0) {
			m_freem(m);
			return IEEE1394_RCODE_COMPLETE;
		}
	}
	n = (pkt->fp_hdr[1] >> 16) & OHCI_NodeId_NodeNumber;
	if (sc->sc_uidtbl == NULL || n > sc->sc_rootid ||
	    sc->sc_uidtbl[n].fu_valid != 0x3) {
		printf("%s: packet from unknown node: phy id %d\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, n);
		m_freem(m);
		fwohci_uid_req(sc, n);
		return IEEE1394_RCODE_COMPLETE;
	}
	memcpy(mtod(m, caddr_t), sc->sc_uidtbl[n].fu_uid, 8);
	if (pkt->fp_tcode == IEEE1394_TCODE_STREAM_DATA) {
		m->m_flags |= M_BCAST;
		mtod(m, u_int32_t *)[2] = mtod(m, u_int32_t *)[3] = 0;
	} else {
		mtod(m, u_int32_t *)[2] = htonl(pkt->fp_hdr[1]);
		mtod(m, u_int32_t *)[3] = htonl(pkt->fp_hdr[2]);
	}
	mtod(m, u_int8_t *)[8] = n;	/*XXX: node id for debug */
	mtod(m, u_int8_t *)[9] =
	    (*pkt->fp_trail >> (16 + OHCI_CTXCTL_SPD_BITPOS)) &
	    ((1 << OHCI_CTXCTL_SPD_BITLEN) - 1);

	m->m_pkthdr.rcvif = NULL;	/* set in child */
	m->m_pkthdr.len = len + m->m_len;
	/*
	 * We may use receive buffer by external mbuf instead of copy here.
	 * But asynchronous receive buffer must be operate in buffer fill
	 * mode, so that each receive buffer will shared by multiple mbufs.
	 * If upper layer doesn't free mbuf soon, e.g. application program
	 * is suspended, buffer must be reallocated.
	 * Isochronous buffer must be operate in packet buffer mode, and
	 * it is easy to map receive buffer to external mbuf.  But it is
	 * used for broadcast/multicast only, and is expected not so
	 * performance sensitive for now.
	 * XXX: The performance may be important for multicast case,
	 * so we should revisit here later.
	 *						-- onoe
	 */
	n = 0;
	iov = pkt->fp_uio.uio_iov;
	while (len > 0) {
		memcpy(mtod(m, caddr_t) + m->m_len, iov->iov_base,
		    iov->iov_len);
		m->m_len += iov->iov_len;
		len -= iov->iov_len;
		iov++;
	}
	(*handler)(sc->sc_sc1394.sc1394_if, m);
	return IEEE1394_RCODE_COMPLETE;
}

static int
fwohci_if_input_iso(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *pkt)
{
	int n, len;
	int chan, tag;
	struct mbuf *m;
	struct iovec *iov;
	void (*handler)(struct device *, struct mbuf *) = arg;
#ifdef FW_DEBUG
	int i;
#endif

	chan = (pkt->fp_hdr[0] & 0x00003f00) >> 8;
	tag  = (pkt->fp_hdr[0] & 0x0000c000) >> 14;
#ifdef FW_DEBUG
	DPRINTFN(1, ("fwohci_if_input_iso: "
	    "tcode=0x%x, chan=%d, tag=%x, dlen=%d",
	    pkt->fp_tcode, chan, tag, pkt->fp_dlen));
	for (i = 0; i < pkt->fp_hlen/4; i++)
		DPRINTFN(2, ("%s%08x", i?" ":"\n\t", pkt->fp_hdr[i]));
	DPRINTFN(2, ("$"));
	for (n = 0, len = pkt->fp_dlen; len > 0; len -= i, n++){
		iov = &pkt->fp_iov[n];
		for (i = 0; i < iov->iov_len; i++)
			DPRINTFN(2, ("%s%02x",
			    (i%32)?((i%4)?"":" "):"\n\t",
			    ((u_int8_t *)iov->iov_base)[i]));
		DPRINTFN(2, ("$"));
	}
	DPRINTFN(2, ("\n"));
#endif /* FW_DEBUG */
	len = pkt->fp_dlen;
	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m == NULL)
		return IEEE1394_RCODE_COMPLETE;
	m->m_len = 16;
	if (m->m_len + len > MHLEN) {
		MCLGET(m, M_DONTWAIT);
		if ((m->m_flags & M_EXT) == 0) {
			m_freem(m);
			return IEEE1394_RCODE_COMPLETE;
		}
	}

	m->m_flags |= M_BCAST;

	if (tag == IEEE1394_TAG_GASP) {
		n = (pkt->fp_hdr[1] >> 16) & OHCI_NodeId_NodeNumber;
		if (sc->sc_uidtbl == NULL || n > sc->sc_rootid ||
		    sc->sc_uidtbl[n].fu_valid != 0x3) {
			printf("%s: packet from unknown node: phy id %d\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname, n);
			m_freem(m);
			return IEEE1394_RCODE_COMPLETE;
		}
		memcpy(mtod(m, caddr_t), sc->sc_uidtbl[n].fu_uid, 8);
		mtod(m, u_int32_t *)[2] = htonl(pkt->fp_hdr[1]);
		mtod(m, u_int32_t *)[3] = htonl(pkt->fp_hdr[2]);
		mtod(m, u_int8_t *)[8] = n;	/*XXX: node id for debug */
		mtod(m, u_int8_t *)[9] =
		    (*pkt->fp_trail >> (16 + OHCI_CTXCTL_SPD_BITPOS)) &
		    ((1 << OHCI_CTXCTL_SPD_BITLEN) - 1);
	}
	mtod(m, u_int8_t *)[14] = chan;
	mtod(m, u_int8_t *)[15] = tag;


	m->m_pkthdr.rcvif = NULL;	/* set in child */
	m->m_pkthdr.len = len + m->m_len;
	/*
	 * We may use receive buffer by external mbuf instead of copy here.
	 * But asynchronous receive buffer must be operate in buffer fill
	 * mode, so that each receive buffer will shared by multiple mbufs.
	 * If upper layer doesn't free mbuf soon, e.g. application program
	 * is suspended, buffer must be reallocated.
	 * Isochronous buffer must be operate in packet buffer mode, and
	 * it is easy to map receive buffer to external mbuf.  But it is
	 * used for broadcast/multicast only, and is expected not so
	 * performance sensitive for now.
	 * XXX: The performance may be important for multicast case,
	 * so we should revisit here later.
	 *						-- onoe
	 */
	n = 0;
	iov = pkt->fp_uio.uio_iov;
	while (len > 0) {
		memcpy(mtod(m, caddr_t) + m->m_len, iov->iov_base,
		    iov->iov_len);
	        m->m_len += iov->iov_len;
	        len -= iov->iov_len;
		iov++;
	}
	(*handler)(sc->sc_sc1394.sc1394_if, m);
	return IEEE1394_RCODE_COMPLETE;
}



static int
fwohci_if_output(struct device *self, struct mbuf *m0,
    void (*callback)(struct device *, struct mbuf *))
{
	struct fwohci_softc *sc = (struct fwohci_softc *)self;
	struct fwohci_pkt pkt;
	u_int8_t *p;
	int n, error, spd, hdrlen, maxrec;
#ifdef FW_DEBUG
	struct mbuf *m;
#endif

	p = mtod(m0, u_int8_t *);
	if (m0->m_flags & (M_BCAST | M_MCAST)) {
		spd = IEEE1394_SPD_S100;	/*XXX*/
		maxrec = 512;			/*XXX*/
		hdrlen = 8;
	} else {
		n = fwohci_uid_lookup(sc, p);
		if (n < 0) {
			printf("%s: nodeid unknown:"
			    " %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname,
			    p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
			error = EHOSTUNREACH;
			goto end;
		}
		if (n == IEEE1394_BCAST_PHY_ID) {
			printf("%s: broadcast with !M_MCAST\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname);
#ifdef FW_DEBUG
			DPRINTFN(2, ("packet:"));
			for (m = m0; m != NULL; m = m->m_next) {
				for (n = 0; n < m->m_len; n++)
					DPRINTFN(2, ("%s%02x", (n%32)?
					    ((n%4)?"":" "):"\n    ",
					    mtod(m, u_int8_t *)[n]));
				DPRINTFN(2, ("$"));
			}
			DPRINTFN(2, ("\n"));
#endif
			error = EHOSTUNREACH;
			goto end;
		}
		maxrec = 2 << p[8];
		spd = p[9];
		hdrlen = 0;
	}
	if (spd > sc->sc_sc1394.sc1394_link_speed) {
		DPRINTF(("fwohci_if_output: spd (%d) is faster than %d\n",
		    spd, sc->sc_sc1394.sc1394_link_speed));
		spd = sc->sc_sc1394.sc1394_link_speed;
	}
	if (maxrec > (512 << spd)) {
		DPRINTF(("fwohci_if_output: maxrec (%d) is larger for spd (%d)"
		    "\n", maxrec, spd));
		maxrec = 512 << spd;
	}
	while (maxrec > sc->sc_sc1394.sc1394_max_receive) {
		DPRINTF(("fwohci_if_output: maxrec (%d) is larger than"
		    " %d\n", maxrec, sc->sc_sc1394.sc1394_max_receive));
		maxrec >>= 1;
	}
	if (maxrec < 512) {
		DPRINTF(("fwohci_if_output: maxrec (%d) is smaller than "
		    "minimum\n", maxrec));
		maxrec = 512;
	}

	m_adj(m0, 16 - hdrlen);
	if (m0->m_pkthdr.len > maxrec) {
		DPRINTF(("fwohci_if_output: packet too big: hdr %d, pktlen "
		    "%d, maxrec %d\n", hdrlen, m0->m_pkthdr.len, maxrec));
		error = E2BIG;	/*XXX*/
		goto end;
	}

	memset(&pkt, 0, sizeof(pkt));
	pkt.fp_uio.uio_iov = pkt.fp_iov;
	pkt.fp_uio.uio_segflg = UIO_SYSSPACE;
	pkt.fp_uio.uio_rw = UIO_WRITE;
	if (m0->m_flags & (M_BCAST | M_MCAST)) {
		/* construct GASP header */
		p = mtod(m0, u_int8_t *);
		p[0] = sc->sc_nodeid >> 8;
		p[1] = sc->sc_nodeid & 0xff;
		p[2] = 0x00; p[3] = 0x00; p[4] = 0x5e;
		p[5] = 0x00; p[6] = 0x00; p[7] = 0x01;
		pkt.fp_tcode = IEEE1394_TCODE_STREAM_DATA;
		pkt.fp_hlen = 8;
		pkt.fp_hdr[0] = (spd << 16) | (IEEE1394_TAG_GASP << 14) |
		    ((sc->sc_csr[CSR_SB_BROADCAST_CHANNEL] &
		    OHCI_NodeId_NodeNumber) << 8);
		pkt.fp_hdr[1] = m0->m_pkthdr.len << 16;
	} else {
		pkt.fp_tcode = IEEE1394_TCODE_WRITE_REQ_BLOCK;
		pkt.fp_hlen = 16;
		pkt.fp_hdr[0] = 0x00800100 | (sc->sc_tlabel << 10) |
		    (spd << 16);
		pkt.fp_hdr[1] =
		    (((sc->sc_nodeid & OHCI_NodeId_BusNumber) | n) << 16) |
		    (p[10] << 8) | p[11];
		pkt.fp_hdr[2] = (p[12]<<24) | (p[13]<<16) | (p[14]<<8) | p[15];
		pkt.fp_hdr[3] = m0->m_pkthdr.len << 16;
		sc->sc_tlabel = (sc->sc_tlabel + 1) & 0x3f;
	}
	pkt.fp_hdr[0] |= (pkt.fp_tcode << 4);
	pkt.fp_dlen = m0->m_pkthdr.len;
	pkt.fp_m = m0;
	pkt.fp_callback = callback;
	error = fwohci_at_output(sc, sc->sc_ctx_atrq, &pkt);
	m0 = pkt.fp_m;
  end:
	if (m0 != NULL) {
		if (callback)
			(*callback)(sc->sc_sc1394.sc1394_if, m0);
		else
			m_freem(m0);
	}
	return error;
}

/*
 * High level routines to provide abstraction to attaching layers to
 * send/receive data.
 */

/*
 * These break down into 4 routines as follows:
 *
 * int fwohci_read(struct ieee1394_abuf *)
 *
 * This routine will attempt to read a region from the requested node.
 * A callback must be provided which will be called when either the completed
 * read is done or an unrecoverable error occurs. This is mainly a convenience
 * routine since it will encapsulate retrying a region as quadlet vs. block
 * reads and recombining all the returned data. This could also be done with a
 * series of write/inreg's for each packet sent.
 *
 * int fwohci_write(struct ieee1394_abuf *)
 *
 * The work horse main entry point for putting packets on the bus. This is the
 * generalized interface for fwnode/etc code to put packets out onto the bus.
 * It accepts all standard ieee1394 tcodes (XXX: only a few today) and
 * optionally will callback via a func pointer to the calling code with the
 * resulting ACK code from the packet. If the ACK code is to be ignored (i.e.
 * no cb) then the write routine will take care of free'ing the abuf since the
 * fwnode/etc code won't have any knowledge of when to do this. This allows for
 * simple one-off packets to be sent from the upper-level code without worrying
 * about a callback for cleanup.
 *
 * int fwohci_inreg(struct ieee1394_abuf *, int)
 *
 * This is very simple. It evals the abuf passed in and registers an internal
 * handler as the callback for packets received for that operation.
 * The integer argument specifies whether on a block read/write operation to
 * allow sub-regions to be read/written (in block form) as well.
 *
 * XXX: This whole structure needs to be redone as a list of regions and
 * operations allowed on those regions.
 *
 * int fwohci_unreg(struct ieee1394_abuf *, int)
 *
 * This simply unregisters the respective callback done via inreg for items
 * which only need to register an area for a one-time operation (like a status
 * buffer a remote node will write to when the current operation is done). The
 * int argument specifies the same behavior as inreg, except in reverse (i.e.
 * it unregisters).
 */

static int
fwohci_read(struct ieee1394_abuf *ab)
{
	struct fwohci_pkt pkt;
	struct ieee1394_softc *sc = ab->ab_req;
	struct fwohci_softc *psc =
	    (struct fwohci_softc *)sc->sc1394_dev.dv_parent;
	struct fwohci_cb *fcb;
	u_int32_t high, lo;
	int rv, tcode;

	/* Have to have a callback when reading. */
	if (ab->ab_cb == NULL)
		return -1;

	fcb = malloc(sizeof(struct fwohci_cb), M_DEVBUF, M_WAITOK);
	fcb->ab = ab;
	fcb->count = 0;
	fcb->abuf_valid = 1;

	high = ((ab->ab_addr & 0x0000ffff00000000ULL) >> 32);
	lo = (ab->ab_addr & 0x00000000ffffffffULL);

	memset(&pkt, 0, sizeof(pkt));
	pkt.fp_hdr[1] = ((0xffc0 | ab->ab_req->sc1394_node_id) << 16) | high;
	pkt.fp_hdr[2] = lo;
	pkt.fp_dlen = 0;

	if (ab->ab_length == 4) {
		pkt.fp_tcode = IEEE1394_TCODE_READ_REQ_QUAD;
		tcode = IEEE1394_TCODE_READ_RESP_QUAD;
		pkt.fp_hlen = 12;
	} else {
		pkt.fp_tcode = IEEE1394_TCODE_READ_REQ_BLOCK;
		pkt.fp_hlen = 16;
		tcode = IEEE1394_TCODE_READ_RESP_BLOCK;
		pkt.fp_hdr[3] = (ab->ab_length << 16);
	}
	pkt.fp_hdr[0] = 0x00000100 | (sc->sc1394_link_speed << 16) |
	    (psc->sc_tlabel << 10) | (pkt.fp_tcode << 4);

	pkt.fp_statusarg = fcb;
	pkt.fp_statuscb = fwohci_read_resp;

	rv = fwohci_handler_set(psc, tcode, ab->ab_req->sc1394_node_id,
	    psc->sc_tlabel, fwohci_read_resp, fcb);
	if (rv)
		return rv;
	rv = fwohci_at_output(psc, psc->sc_ctx_atrq, &pkt);
	if (rv)
		fwohci_handler_set(psc, tcode, ab->ab_req->sc1394_node_id,
		    psc->sc_tlabel, NULL, NULL);
	psc->sc_tlabel = (psc->sc_tlabel + 1) & 0x3f;
	fcb->count = 1;
	return rv;
}

static int
fwohci_write(struct ieee1394_abuf *ab)
{
	struct fwohci_pkt pkt;
	struct ieee1394_softc *sc = ab->ab_req;
	struct fwohci_softc *psc =
	    (struct fwohci_softc *)sc->sc1394_dev.dv_parent;
	u_int32_t high, lo;
	int rv;

	if (ab->ab_length > IEEE1394_MAX_REC(sc->sc1394_max_receive)) {
		DPRINTF(("Packet too large: %d\n", ab->ab_length));
		return E2BIG;
	}

	if (ab->ab_data && ab->ab_uio)
		panic("Can't call with uio and data set");
	if ((ab->ab_data == NULL) && (ab->ab_uio == NULL))
		panic("One of either ab_data or ab_uio must be set");

	memset(&pkt, 0, sizeof(pkt));

	pkt.fp_tcode = ab->ab_tcode;
	if (ab->ab_data) {
		pkt.fp_uio.uio_iov = pkt.fp_iov;
		pkt.fp_uio.uio_segflg = UIO_SYSSPACE;
		pkt.fp_uio.uio_rw = UIO_WRITE;
	} else
		memcpy(&pkt.fp_uio, ab->ab_uio, sizeof(struct uio));

	pkt.fp_statusarg = ab;
	pkt.fp_statuscb = fwohci_write_ack;

	switch (ab->ab_tcode) {
	case IEEE1394_TCODE_WRITE_RESP:
		pkt.fp_hlen = 12;
	case IEEE1394_TCODE_READ_RESP_QUAD:
	case IEEE1394_TCODE_READ_RESP_BLOCK:
		if (!pkt.fp_hlen)
			pkt.fp_hlen = 16;
		high = ab->ab_retlen;
		ab->ab_retlen = 0;
		lo = 0;
		pkt.fp_hdr[0] = 0x00000100 | (sc->sc1394_link_speed << 16) |
		    (ab->ab_tlabel << 10) | (pkt.fp_tcode << 4);
		break;
	default:
		pkt.fp_hlen = 16;
		high = ((ab->ab_addr & 0x0000ffff00000000ULL) >> 32);
		lo = (ab->ab_addr & 0x00000000ffffffffULL);
		pkt.fp_hdr[0] = 0x00000100 | (sc->sc1394_link_speed << 16) |
		    (psc->sc_tlabel << 10) | (pkt.fp_tcode << 4);
		psc->sc_tlabel = (psc->sc_tlabel + 1) & 0x3f;
		break;
	}

	pkt.fp_hdr[1] = ((0xffc0 | ab->ab_req->sc1394_node_id) << 16) | high;
	pkt.fp_hdr[2] = lo;
	if (pkt.fp_hlen == 16) {
		if (ab->ab_length == 4) {
			pkt.fp_hdr[3] = ab->ab_data[0];
			pkt.fp_dlen = 0;
		}  else {
			pkt.fp_hdr[3] = (ab->ab_length << 16);
			pkt.fp_dlen = ab->ab_length;
			if (ab->ab_data) {
				pkt.fp_uio.uio_iovcnt = 1;
				pkt.fp_uio.uio_resid = ab->ab_length;
				pkt.fp_iov[0].iov_base = ab->ab_data;
				pkt.fp_iov[0].iov_len = ab->ab_length;
			}
		}
	}
	switch (ab->ab_tcode) {
	case IEEE1394_TCODE_WRITE_RESP:
	case IEEE1394_TCODE_READ_RESP_QUAD:
	case IEEE1394_TCODE_READ_RESP_BLOCK:
		rv = fwohci_at_output(psc, psc->sc_ctx_atrs, &pkt);
		break;
	default:
		rv = fwohci_at_output(psc, psc->sc_ctx_atrq, &pkt);
		break;
	}
	return rv;
}

static int
fwohci_read_resp(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *pkt)
{
	struct fwohci_cb *fcb = arg;
	struct ieee1394_abuf *ab = fcb->ab;
	struct fwohci_pkt newpkt;
	u_int32_t *cur, high, lo;
	int i, tcode, rcode, status, rv;

	/*
	 * Both the ACK handling and normal response callbacks are handled here.
	 * The main reason for this is the various error conditions that can
	 * occur trying to block read some areas and the ways that gets reported
	 * back to calling station. This is a variety of ACK codes, responses,
	 * etc which makes it much more difficult to process if both aren't
	 * handled here.
	 */

	/* Check for status packet. */

	if (pkt->fp_tcode == -1) {
		status = pkt->fp_status & OHCI_DESC_STATUS_ACK_MASK;
		rcode = -1;
		tcode = (pkt->fp_hdr[0] >> 4) & 0xf;
		if ((status != OHCI_CTXCTL_EVENT_ACK_COMPLETE) &&
		    (status != OHCI_CTXCTL_EVENT_ACK_PENDING))
			DPRINTFN(2, ("Got status packet: 0x%02x\n",
			    (unsigned int)status));
		fcb->count--;

		/*
		 * Got all the ack's back and the buffer is invalid (i.e. the
		 * callback has been called. Clean up.
		 */

		if (fcb->abuf_valid == 0) {
			if (fcb->count == 0)
				free(fcb, M_DEVBUF);
			return IEEE1394_RCODE_COMPLETE;
		}
	} else {
		status = -1;
		tcode = pkt->fp_tcode;
		rcode = (pkt->fp_hdr[1] & 0x0000f000) >> 12;
	}

	/*
	 * Some area's (like the config rom want to be read as quadlets only.
	 *
	 * The current ideas to try are:
	 *
	 * Got an ACK_TYPE_ERROR on a block read.
	 *
	 * Got either RCODE_TYPE or RCODE_ADDRESS errors in a block read
	 * response.
	 *
	 * In all cases construct a new packet for a quadlet read and let
	 * mutli_resp handle the iteration over the space.
	 */

	if (((status == OHCI_CTXCTL_EVENT_ACK_TYPE_ERROR) &&
	     (tcode == IEEE1394_TCODE_READ_REQ_BLOCK)) ||
	    (((rcode == IEEE1394_RCODE_TYPE_ERROR) ||
	     (rcode == IEEE1394_RCODE_ADDRESS_ERROR)) &&
	      (tcode == IEEE1394_TCODE_READ_RESP_BLOCK))) {

		/* Read the area in quadlet chunks (internally track this). */

		memset(&newpkt, 0, sizeof(newpkt));

		high = ((ab->ab_addr & 0x0000ffff00000000ULL) >> 32);
		lo = (ab->ab_addr & 0x00000000ffffffffULL);

		newpkt.fp_tcode = IEEE1394_TCODE_READ_REQ_QUAD;
		newpkt.fp_hlen = 12;
		newpkt.fp_dlen = 0;
		newpkt.fp_hdr[1] =
		    ((0xffc0 | ab->ab_req->sc1394_node_id) << 16) | high;
		newpkt.fp_hdr[2] = lo;
		newpkt.fp_hdr[0] = 0x00000100 | (sc->sc_tlabel << 10) |
		    (newpkt.fp_tcode << 4);

		rv = fwohci_handler_set(sc, IEEE1394_TCODE_READ_RESP_QUAD,
		    ab->ab_req->sc1394_node_id, sc->sc_tlabel,
		    fwohci_read_multi_resp, fcb);
		if (rv) {
			(*ab->ab_cb)(ab, -1);
			goto cleanup;
		}
		newpkt.fp_statusarg = fcb;
		newpkt.fp_statuscb = fwohci_read_resp;
		rv = fwohci_at_output(sc, sc->sc_ctx_atrq, &newpkt);
		if (rv) {
			fwohci_handler_set(sc, IEEE1394_TCODE_READ_RESP_QUAD,
			    ab->ab_req->sc1394_node_id, sc->sc_tlabel, NULL,
			    NULL);
			(*ab->ab_cb)(ab, -1);
			goto cleanup;
		}
		fcb->count++;
		sc->sc_tlabel = (sc->sc_tlabel + 1) & 0x3f;
		return IEEE1394_RCODE_COMPLETE;
	} else if ((rcode != -1) || ((status != -1) &&
	    (status != OHCI_CTXCTL_EVENT_ACK_COMPLETE) &&
	    (status != OHCI_CTXCTL_EVENT_ACK_PENDING))) {

		/*
		 * Recombine all the iov data into 1 chunk for higher
		 * level code.
		 */

		if (rcode != -1) {
			cur = ab->ab_data;
			for (i = 0; i < pkt->fp_uio.uio_iovcnt; i++) {
				/*
				 * Make sure and don't exceed the buffer
				 * allocated for return.
				 */
				if ((ab->ab_retlen + pkt->fp_iov[i].iov_len) >
				    ab->ab_length) {
					memcpy(cur, pkt->fp_iov[i].iov_base,
					    (ab->ab_length - ab->ab_retlen));
					ab->ab_retlen = ab->ab_length;
					break;
				}
				memcpy(cur, pkt->fp_iov[i].iov_base,
				    pkt->fp_iov[i].iov_len);
				cur += pkt->fp_iov[i].iov_len;
				ab->ab_retlen += pkt->fp_iov[i].iov_len;
			}
		}
		if (status != -1)
			/* XXX: Need a complete tlabel interface. */
			for (i = 0; i < 64; i++)
				fwohci_handler_set(sc,
				    IEEE1394_TCODE_READ_RESP_QUAD,
				    ab->ab_req->sc1394_node_id, i, NULL, NULL);
		(*ab->ab_cb)(ab, rcode);
		goto cleanup;
	} else
		/* Good ack packet. */
		return IEEE1394_RCODE_COMPLETE;

	/* Can't get here unless ab->ab_cb has been called. */

 cleanup:
	fcb->abuf_valid = 0;
	if (fcb->count == 0)
		free(fcb, M_DEVBUF);
	return IEEE1394_RCODE_COMPLETE;
}

static int
fwohci_read_multi_resp(struct fwohci_softc *sc, void *arg,
    struct fwohci_pkt *pkt)
{
	struct fwohci_cb *fcb = arg;
	struct ieee1394_abuf *ab = fcb->ab;
	struct fwohci_pkt newpkt;
	u_int32_t high, lo;
	int rcode, rv;

	/*
	 * Bad return codes from the wire, just return what's already in the
	 * buf.
	 */

	/* Make sure a response packet didn't arrive after a bad ACK. */
	if (fcb->abuf_valid == 0)
		return IEEE1394_RCODE_COMPLETE;

	rcode = (pkt->fp_hdr[1] & 0x0000f000) >> 12;

	if (rcode) {
		(*ab->ab_cb)(ab, rcode);
		goto cleanup;
	}

	if ((ab->ab_retlen + pkt->fp_iov[0].iov_len) > ab->ab_length) {
		memcpy(((char *)ab->ab_data + ab->ab_retlen),
		    pkt->fp_iov[0].iov_base, (ab->ab_length - ab->ab_retlen));
		ab->ab_retlen = ab->ab_length;
	} else {
		memcpy(((char *)ab->ab_data + ab->ab_retlen),
		    pkt->fp_iov[0].iov_base, 4);
		ab->ab_retlen += 4;
	}
	/* Still more, loop and read 4 more bytes. */
	if (ab->ab_retlen < ab->ab_length) {
		memset(&newpkt, 0, sizeof(newpkt));

		high = ((ab->ab_addr & 0x0000ffff00000000ULL) >> 32);
		lo = (ab->ab_addr & 0x00000000ffffffffULL) + ab->ab_retlen;

		newpkt.fp_tcode = IEEE1394_TCODE_READ_REQ_QUAD;
		newpkt.fp_hlen = 12;
		newpkt.fp_dlen = 0;
		newpkt.fp_hdr[1] =
		    ((0xffc0 | ab->ab_req->sc1394_node_id) << 16) | high;
		newpkt.fp_hdr[2] = lo;
		newpkt.fp_hdr[0] = 0x00000100 | (sc->sc_tlabel << 10) |
		    (newpkt.fp_tcode << 4);

		newpkt.fp_statusarg = fcb;
		newpkt.fp_statuscb = fwohci_read_resp;

		/*
		 * Bad return code.  Just give up and return what's
		 * come in now.
		 */
		rv = fwohci_handler_set(sc, IEEE1394_TCODE_READ_RESP_QUAD,
		    ab->ab_req->sc1394_node_id, sc->sc_tlabel,
		    fwohci_read_multi_resp, fcb);
		if (rv)
			(*ab->ab_cb)(ab, -1);
		else {
			rv = fwohci_at_output(sc, sc->sc_ctx_atrq, &newpkt);
			if (rv) {
				fwohci_handler_set(sc,
				    IEEE1394_TCODE_READ_RESP_QUAD,
				    ab->ab_req->sc1394_node_id, sc->sc_tlabel,
				    NULL, NULL);
				(*ab->ab_cb)(ab, -1);
			} else {
				sc->sc_tlabel = (sc->sc_tlabel + 1) & 0x3f;
				fcb->count++;
				return IEEE1394_RCODE_COMPLETE;
			}
		}
	} else
		(*ab->ab_cb)(ab, IEEE1394_RCODE_COMPLETE);

 cleanup:
	/* Can't get here unless ab_cb has been called. */
	fcb->abuf_valid = 0;
	if (fcb->count == 0)
		free(fcb, M_DEVBUF);
	return IEEE1394_RCODE_COMPLETE;
}

static int
fwohci_write_ack(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *pkt)
{
	struct ieee1394_abuf *ab = arg;
	u_int16_t status;


	status = pkt->fp_status & OHCI_DESC_STATUS_ACK_MASK;
	if ((status != OHCI_CTXCTL_EVENT_ACK_COMPLETE) &&
	    (status != OHCI_CTXCTL_EVENT_ACK_PENDING))
		DPRINTF(("Got status packet: 0x%02x\n",
		    (unsigned int)status));

	/* No callback means this level should free the buffers. */
	if (ab->ab_cb)
		(*ab->ab_cb)(ab, status);
	else {
		if (ab->ab_data)
			free(ab->ab_data, M_1394DATA);
		free(ab, M_1394DATA);
	}
	return IEEE1394_RCODE_COMPLETE;
}

static int
fwohci_inreg(struct ieee1394_abuf *ab, int allow)
{
	struct ieee1394_softc *sc = ab->ab_req;
	struct fwohci_softc *psc =
	    (struct fwohci_softc *)sc->sc1394_dev.dv_parent;
	u_int32_t high, lo;
	int i, j, rv;

	high = ((ab->ab_addr & 0x0000ffff00000000ULL) >> 32);
	lo = (ab->ab_addr & 0x00000000ffffffffULL);

	rv = 0;
	switch (ab->ab_tcode) {
	case IEEE1394_TCODE_READ_REQ_QUAD:
	case IEEE1394_TCODE_WRITE_REQ_QUAD:
		if (ab->ab_cb)
			rv = fwohci_handler_set(psc, ab->ab_tcode, high, lo,
			    fwohci_parse_input, ab);
		else
			fwohci_handler_set(psc, ab->ab_tcode, high, lo, NULL,
			    NULL);
		break;
	case IEEE1394_TCODE_READ_REQ_BLOCK:
	case IEEE1394_TCODE_WRITE_REQ_BLOCK:
		if (allow) {
			for (i = 0; i < (ab->ab_length / 4); i++) {
				if (ab->ab_cb) {
					rv = fwohci_handler_set(psc,
					    ab->ab_tcode, high, lo + (i * 4),
					    fwohci_parse_input, ab);
					if (rv)
						break;
				} else
					fwohci_handler_set(psc, ab->ab_tcode,
					    high, lo + (i * 4), NULL, NULL);
			}
			if (i != (ab->ab_length / 4)) {
				j = i + 1;
				for (i = 0; i < j; i++)
					fwohci_handler_set(psc, ab->ab_tcode,
					    high, lo + (i * 4), NULL, NULL);
			}

			/*
			 * XXX: Need something to indicate writing a smaller
			 * amount is ok.
			 */
			if (ab->ab_cb)
                                ab->ab_subok = 1;
		} else {
			if (ab->ab_cb)
				rv = fwohci_handler_set(psc, ab->ab_tcode, high,
				    lo, fwohci_parse_input, ab);
			else
				fwohci_handler_set(psc, ab->ab_tcode, high, lo,
				    NULL, NULL);
		}
		break;
	default:
		DPRINTF(("Invalid registration tcode: %d\n", ab->ab_tcode));
		return -1;
		break;
	}
	return rv;
}

static int
fwohci_unreg(struct ieee1394_abuf *ab, int allow)
{
	void *save;
	int rv;

	save = ab->ab_cb;
	ab->ab_cb = NULL;
	rv = fwohci_inreg(ab, allow);
	ab->ab_cb = save;
	return rv;
}

static int
fwohci_parse_input(struct fwohci_softc *sc, void *arg, struct fwohci_pkt *pkt)
{
	struct ieee1394_abuf *ab = (struct ieee1394_abuf *)arg;
	u_int64_t addr;
	u_int8_t *cur;
	int i, count, ret;

	ab->ab_tcode = (pkt->fp_hdr[0] >> 4) & 0xf;
	ab->ab_tlabel = (pkt->fp_hdr[0] >> 10) & 0x3f;
	addr = (((u_int64_t)(pkt->fp_hdr[1] & 0xffff) << 32) | pkt->fp_hdr[2]);

	/* Make sure it's always 0 in case this gets reused multiple times. */
	ab->ab_retlen = 0;

	switch (ab->ab_tcode) {
	case IEEE1394_TCODE_READ_REQ_QUAD:
		ab->ab_retlen = 4;
		/* Response's (if required) will come from callback code */
		ret = -1;
		break;
	case IEEE1394_TCODE_READ_REQ_BLOCK:
		ab->ab_retlen = (pkt->fp_hdr[3] >> 16) & 0xffff;
		if (ab->ab_subok) {
			if ((addr + ab->ab_retlen) >
			    (ab->ab_addr + ab->ab_length))
				return IEEE1394_RCODE_ADDRESS_ERROR;
		} else
			if (ab->ab_retlen != ab->ab_length)
				return IEEE1394_RCODE_ADDRESS_ERROR;
		/* Response's (if required) will come from callback code */
		ret = -1;
		break;
	case IEEE1394_TCODE_WRITE_REQ_QUAD:
		ab->ab_retlen = 4;
		/* Fall through. */

	case IEEE1394_TCODE_WRITE_REQ_BLOCK:
		if (!ab->ab_retlen)
			ab->ab_retlen = (pkt->fp_hdr[3] >> 16) & 0xffff;
		if (ab->ab_subok) {
			if ((addr + ab->ab_retlen) >
			    (ab->ab_addr + ab->ab_length))
				return IEEE1394_RCODE_ADDRESS_ERROR;
		} else
			if (ab->ab_retlen != ab->ab_length)
				return IEEE1394_RCODE_ADDRESS_ERROR;

		ab->ab_data = malloc(ab->ab_retlen, M_1394DATA, M_WAITOK);
		if (ab->ab_tcode == IEEE1394_TCODE_WRITE_REQ_QUAD)
			ab->ab_data[0] = pkt->fp_hdr[3];
		else {
			count = 0;
			cur = (u_int8_t *)ab->ab_data;
			for (i = 0; i < pkt->fp_uio.uio_iovcnt; i++) {
				memcpy(cur, pkt->fp_iov[i].iov_base,
				    pkt->fp_iov[i].iov_len);
				cur += pkt->fp_iov[i].iov_len;
				count += pkt->fp_iov[i].iov_len;
			}
			if (ab->ab_retlen != count)
				panic("Packet claims %d length "
				    "but only %d bytes returned\n",
				    ab->ab_retlen, count);
		}
		ret = IEEE1394_RCODE_COMPLETE;
		break;
	default:
		panic("Got a callback for a tcode that wasn't requested: %d",
		    ab->ab_tcode);
		break;
	}
	ab->ab_addr = addr;
	ab->ab_cb(ab, IEEE1394_RCODE_COMPLETE);
	return ret;
}

static int
fwohci_submatch(struct device *parent, struct cfdata *cf, void *aux)
{
	struct ieee1394_attach_args *fwa = aux;

	/* Both halves must be filled in for a match. */
	if ((cf->fwbuscf_idhi == FWBUS_UNK_IDHI &&
	    cf->fwbuscf_idlo == FWBUS_UNK_IDLO) ||
	    (cf->fwbuscf_idhi == ntohl(*((u_int32_t *)&fwa->uid[0])) &&
	    cf->fwbuscf_idlo == ntohl(*((u_int32_t *)&fwa->uid[4]))))
		return (config_match(parent, cf, aux));
	return 0;
}

int
fwohci_detach(struct fwohci_softc *sc, int flags)
{
	int rv = 0;

	if (sc->sc_sc1394.sc1394_if != NULL)
		rv = config_detach(sc->sc_sc1394.sc1394_if, flags);
	if (rv != 0)
		return (rv);

	callout_stop(&sc->sc_selfid_callout);

	if (sc->sc_powerhook != NULL)
		powerhook_disestablish(sc->sc_powerhook);
	if (sc->sc_shutdownhook != NULL)
		shutdownhook_disestablish(sc->sc_shutdownhook);

	return (rv);
}

int
fwohci_activate(struct device *self, enum devact act)
{
	struct fwohci_softc *sc = (struct fwohci_softc *)self;
	int s, rv = 0;

	s = splhigh();
	switch (act) {
	case DVACT_ACTIVATE:
		rv = EOPNOTSUPP;
		break;

	case DVACT_DEACTIVATE:
		if (sc->sc_sc1394.sc1394_if != NULL)
	                rv = config_deactivate(sc->sc_sc1394.sc1394_if);
		break;
	}
	splx(s);

	return (rv);
}

#ifdef FW_DEBUG
static void
fwohci_show_intr(struct fwohci_softc *sc, u_int32_t intmask)
{

	printf("%s: intmask=0x%08x:", sc->sc_sc1394.sc1394_dev.dv_xname,
	    intmask);
	if (intmask & OHCI_Int_CycleTooLong)
		printf(" CycleTooLong");
	if (intmask & OHCI_Int_UnrecoverableError)
		printf(" UnrecoverableError");
	if (intmask & OHCI_Int_CycleInconsistent)
		printf(" CycleInconsistent");
	if (intmask & OHCI_Int_BusReset)
		printf(" BusReset");
	if (intmask & OHCI_Int_SelfIDComplete)
		printf(" SelfIDComplete");
	if (intmask & OHCI_Int_LockRespErr)
		printf(" LockRespErr");
	if (intmask & OHCI_Int_PostedWriteErr)
		printf(" PostedWriteErr");
	if (intmask & OHCI_Int_ReqTxComplete)
		printf(" ReqTxComplete(0x%04x)",
		    OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_TX_REQUEST,
		    OHCI_SUBREG_ContextControlClear));
	if (intmask & OHCI_Int_RespTxComplete)
		printf(" RespTxComplete(0x%04x)",
		    OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_TX_RESPONSE,
		    OHCI_SUBREG_ContextControlClear));
	if (intmask & OHCI_Int_ARRS)
		printf(" ARRS(0x%04x)",
		    OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_RX_RESPONSE,
		    OHCI_SUBREG_ContextControlClear));
	if (intmask & OHCI_Int_ARRQ)
		printf(" ARRQ(0x%04x)",
		    OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_RX_REQUEST,
		    OHCI_SUBREG_ContextControlClear));
	if (intmask & OHCI_Int_IsochRx)
		printf(" IsochRx(0x%08x)",
		    OHCI_CSR_READ(sc, OHCI_REG_IsoRecvIntEventClear));
	if (intmask & OHCI_Int_IsochTx)
		printf(" IsochTx(0x%08x)",
		    OHCI_CSR_READ(sc, OHCI_REG_IsoXmitIntEventClear));
	if (intmask & OHCI_Int_RQPkt)
		printf(" RQPkt(0x%04x)",
		    OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_RX_REQUEST,
		    OHCI_SUBREG_ContextControlClear));
	if (intmask & OHCI_Int_RSPkt)
		printf(" RSPkt(0x%04x)",
		    OHCI_ASYNC_DMA_READ(sc, OHCI_CTX_ASYNC_RX_RESPONSE,
		    OHCI_SUBREG_ContextControlClear));
	printf("\n");
}

static void
fwohci_show_phypkt(struct fwohci_softc *sc, u_int32_t val)
{
	u_int8_t key, phyid;

	key = (val & 0xc0000000) >> 30;
	phyid = (val & 0x3f000000) >> 24;
	printf("%s: PHY packet from %d: ",
	    sc->sc_sc1394.sc1394_dev.dv_xname, phyid);
	switch (key) {
	case 0:
		printf("PHY Config:");
		if (val & 0x00800000)
			printf(" ForceRoot");
		if (val & 0x00400000)
			printf(" Gap=%x", (val & 0x003f0000) >> 16);
		printf("\n");
		break;
	case 1:
		printf("Link-on\n");
		break;
	case 2:
		printf("SelfID:");
		if (val & 0x00800000) {
			printf(" #%d", (val & 0x00700000) >> 20);
		} else {
			if (val & 0x00400000)
				printf(" LinkActive");
			printf(" Gap=%x", (val & 0x003f0000) >> 16);
			printf(" Spd=S%d", 100 << ((val & 0x0000c000) >> 14));
			if (val & 0x00000800)
				printf(" Cont");
			if (val & 0x00000002)
				printf(" InitiateBusReset");
		}
		if (val & 0x00000001)
			printf(" +");
		printf("\n");
		break;
	default:
		printf("unknown: 0x%08x\n", val);
		break;
	}
}
#endif /* FW_DEBUG */

#if 0
void fwohci_dumpreg(struct ieee1394_softc *, struct fwiso_regdump *);

void
fwohci_dumpreg(struct ieee1394_softc *isc, struct fwiso_regdump *fr)
{
	struct fwohci_softc *sc = (struct fwohci_softc *)isc;
#if 0
	u_int32_t val;

	printf("%s: dump reg\n", isc->sc1394_dev.dv_xname);
	printf("\tNodeID reg 0x%08x\n",
	    OHCI_CSR_READ(sc, OHCI_REG_NodeId));
	val = OHCI_CSR_READ(sc, OHCI_REG_IsochronousCycleTimer);
	printf("\tIsoCounter 0x%08x, %d %d %d", val,
	    (val >> 25) & 0xfe, (val >> 12) & 0x1fff, val & 0xfff);
	val = OHCI_CSR_READ(sc, OHCI_REG_IntMaskSet);
	printf(" IntMask    0x%08x, %s\n", val,
	    val & OHCI_Int_IsochTx ? "isoTx" : "");

	val = OHCI_SYNC_TX_DMA_READ(sc, 0, OHCI_SUBREG_ContextControlSet);
	printf("\tIT_CommandPtr 0x%08x ContextCtrl 0x%08x%s%s%s%s\n",
	    OHCI_SYNC_TX_DMA_READ(sc, 0, OHCI_SUBREG_CommandPtr),
	    val,
	    val & OHCI_CTXCTL_RUN ? " run" : "",
	    val & OHCI_CTXCTL_WAKE ? " wake" : "",
	    val & OHCI_CTXCTL_DEAD ? " dead" : "",
	    val & OHCI_CTXCTL_ACTIVE ? " active" : "");
#endif

	fr->fr_nodeid = OHCI_CSR_READ(sc, OHCI_REG_NodeId);
	fr->fr_isocounter = OHCI_CSR_READ(sc, OHCI_REG_IsochronousCycleTimer);
	fr->fr_intmask = OHCI_CSR_READ(sc, OHCI_REG_IntMaskSet);
	fr->fr_it0_commandptr = OHCI_SYNC_TX_DMA_READ(sc, 0, OHCI_SUBREG_CommandPtr);
	fr->fr_it0_contextctrl = OHCI_SYNC_TX_DMA_READ(sc, 0, OHCI_SUBREG_ContextControlSet);


}
#endif


u_int16_t
fwohci_cycletimer(struct fwohci_softc *sc)
{
	u_int32_t reg;

	reg = OHCI_CSR_READ(sc, OHCI_REG_IsochronousCycleTimer);

	return (reg >> 12)&0xffff;
}


u_int16_t
fwohci_it_cycletimer(ieee1394_it_tag_t it)
{
	struct fwohci_it_ctx *itc = (struct fwohci_it_ctx *)it;

	return fwohci_cycletimer(itc->itc_sc);
}





/*
 * return value: if positive value, number of DMA buffer segments.  If
 * negative value, error happens.  Never zero.
 */
static int
fwohci_misc_dmabuf_alloc(bus_dma_tag_t dmat, int dsize, int segno,
    bus_dma_segment_t *segp, bus_dmamap_t *dmapp, void **mapp,
    const char *xname)
{
	int nsegs;
	int error;

	printf("fwohci_misc_desc_alloc: dsize %d segno %d\n", dsize, segno);

	if ((error = bus_dmamem_alloc(dmat, dsize, PAGE_SIZE, 0,
	    segp, segno, &nsegs, 0)) != 0) {
		printf("%s: unable to allocate descriptor buffer, error = %d\n",
		    xname, error);
		goto fail_0;
	}

	DPRINTF(("fwohci_misc_desc_alloc: %d segment[s]\n", nsegs));

	if ((error = bus_dmamem_map(dmat, segp, nsegs, dsize, (caddr_t *)mapp,
	    BUS_DMA_COHERENT | BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to map descriptor buffer, error = %d\n",
		    xname, error);
		goto fail_1;
	}

	DPRINTF(("fwohci_misc_desc_alloc: %s map ok\n", xname));

#ifdef FWOHCI_DEBUG
	{
		int loop;

		for (loop = 0; loop < nsegs; ++loop) {
			printf("\t%.2d: 0x%lx - 0x%lx\n", loop,
			    (long)segp[loop].ds_addr,
			    (long)segp[loop].ds_addr + segp[loop].ds_len - 1);
		}
	}
#endif /* FWOHCI_DEBUG */

	if ((error = bus_dmamap_create(dmat, dsize, nsegs, dsize,
	    0, BUS_DMA_WAITOK, dmapp)) != 0) {
		printf("%s: unable to create descriptor buffer DMA map, "
		    "error = %d\n", xname, error);
		goto fail_2;
	}

	DPRINTF(("fwohci_misc_dmabuf_alloc: bus_dmamem_create success\n"));

	if ((error = bus_dmamap_load(dmat, *dmapp, *mapp, dsize, NULL,
	    BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to load descriptor buffer DMA map, "
		    "error = %d\n", xname, error);
		goto fail_3;
	}

	DPRINTF(("fwohci_it_desc_alloc: bus_dmamem_load success\n"));

	return nsegs;

  fail_3:
	bus_dmamap_destroy(dmat, *dmapp);
  fail_2:
	bus_dmamem_unmap(dmat, *mapp, dsize);
  fail_1:
	bus_dmamem_free(dmat, segp, nsegs);
  fail_0:
	return error;
}


static void
fwohci_misc_dmabuf_free(bus_dma_tag_t dmat, int dsize, int nsegs,
    bus_dma_segment_t *segp, bus_dmamap_t *dmapp, caddr_t map)
{
	bus_dmamap_destroy(dmat, *dmapp);
	bus_dmamem_unmap(dmat, map, dsize);
	bus_dmamem_free(dmat, segp, nsegs);
}




/*
 * Isochronous receive service
 */

/*
 * static struct fwohci_ir_ctx *
 * fwohci_ir_ctx_construct(struct fwohci_softc *sc, int no, int ch, int tagbm,
 *			   int bufnum, int maxsize, int flags)
 */
static struct fwohci_ir_ctx *
fwohci_ir_ctx_construct(struct fwohci_softc *sc, int no, int ch, int tagbm,
    int bufnum, int maxsize, int flags)
{
	struct fwohci_ir_ctx *irc;
	int i;

	printf("fwohci_ir_construct(%s, %d, %d, %x, %d, %d\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname, no, ch, tagbm, bufnum, maxsize);

	if ((irc = malloc(sizeof(*irc), M_DEVBUF, M_WAITOK|M_ZERO)) == NULL) {
		return NULL;
	}

	irc->irc_sc = sc;

	irc->irc_num = no;
	irc->irc_status = 0;

	irc->irc_channel = ch;
	irc->irc_tagbm = tagbm;

	irc->irc_desc_num = bufnum;

	irc->irc_flags = flags;

	/* add header */
	maxsize += 8;
	/* rounding up */
	for (i = 32; i < maxsize; i <<= 1);
	printf("fwohci_ir_ctx_construct: maxsize %d => %d\n",
	    maxsize, i);

	maxsize = i;

	irc->irc_maxsize = maxsize;
	irc->irc_buf_totalsize = bufnum * maxsize;

	if (fwohci_ir_buf_setup(irc)) {
		/* cannot alloc descriptor */
		return NULL;
	}

	irc->irc_readtop = irc->irc_desc_map;
	irc->irc_writeend = irc->irc_desc_map + irc->irc_desc_num - 1;
	irc->irc_savedbranch = irc->irc_writeend->fd_branch;
	irc->irc_writeend->fd_branch = 0;
	/* sync */

	if (fwohci_ir_stop(irc) || fwohci_ir_init(irc)) {
		return NULL;
	}

	irc->irc_status |= IRC_STATUS_READY;

	return irc;
}



/*
 * static void fwohci_ir_ctx_destruct(struct fwohci_ir_ctx *irc)
 *
 *	This function release all DMA buffers and itself.
 */
static void
fwohci_ir_ctx_destruct(struct fwohci_ir_ctx *irc)
{
	fwohci_misc_dmabuf_free(irc->irc_sc->sc_dmat, irc->irc_buf_totalsize,
	    irc->irc_buf_nsegs, irc->irc_buf_segs,
	    &irc->irc_buf_dmamap, (caddr_t)irc->irc_buf);
	fwohci_misc_dmabuf_free(irc->irc_sc->sc_dmat,
	    irc->irc_desc_size,
	    irc->irc_desc_nsegs, &irc->irc_desc_seg,
	    &irc->irc_desc_dmamap, (caddr_t)irc->irc_desc_map);

	free(irc, M_DEVBUF);
}




/*
 * static int fwohci_ir_buf_setup(struct fwohci_ir_ctx *irc)
 *
 *	Allocates descriptors for context DMA dedicated for
 *	isochronous receive.
 *
 *	This function returns 0 (zero) if it succeeds.  Otherwise,
 *	return negative value.
 */
static int
fwohci_ir_buf_setup(struct fwohci_ir_ctx *irc)
{
	int nsegs;
	struct fwohci_desc *fd;
	u_int32_t branch;
	int bufno = 0;		/* DMA segment */
	bus_size_t bufused = 0;	/* offset in a DMA segment */

	irc->irc_desc_size = irc->irc_desc_num * sizeof(struct fwohci_desc);

	nsegs = fwohci_misc_dmabuf_alloc(irc->irc_sc->sc_dmat,
	    irc->irc_desc_size, 1, &irc->irc_desc_seg, &irc->irc_desc_dmamap,
	    (void **)&irc->irc_desc_map,
	    irc->irc_sc->sc_sc1394.sc1394_dev.dv_xname);

	if (nsegs < 0) {
		printf("fwohci_ir_buf_alloc: cannot get descriptor\n");
		return -1;
	}
	irc->irc_desc_nsegs = nsegs;

	nsegs = fwohci_misc_dmabuf_alloc(irc->irc_sc->sc_dmat,
	    irc->irc_buf_totalsize, 16, irc->irc_buf_segs,
	    &irc->irc_buf_dmamap, (void **)&irc->irc_buf,
	    irc->irc_sc->sc_sc1394.sc1394_dev.dv_xname);

	if (nsegs < 0) {
		printf("fwohci_ir_buf_alloc: cannot get DMA buffer\n");
		fwohci_misc_dmabuf_free(irc->irc_sc->sc_dmat,
		    irc->irc_desc_size,
		    irc->irc_desc_nsegs, &irc->irc_desc_seg,
		    &irc->irc_desc_dmamap, (caddr_t)irc->irc_desc_map);
		return -1;
	}
	irc->irc_buf_nsegs = nsegs;

	branch = irc->irc_desc_dmamap->dm_segs[0].ds_addr
	    + sizeof(struct fwohci_desc);
	bufno = 0;
	bufused = 0;

	for (fd = irc->irc_desc_map;
	     fd < irc->irc_desc_map + irc->irc_desc_num; ++fd) {
		fd->fd_flags = OHCI_DESC_INPUT | OHCI_DESC_LAST
		    | OHCI_DESC_STATUS | OHCI_DESC_BRANCH;
		if (irc->irc_flags & IEEE1394_IR_SHORTDELAY) {
			fd->fd_flags |= OHCI_DESC_INTR_ALWAYS;
		}
#if 0
		if  ((fd - irc->irc_desc_map) % 64 == 0) {
			fd->fd_flags |= OHCI_DESC_INTR_ALWAYS;
		}
#endif
		fd->fd_reqcount = irc->irc_maxsize;
		fd->fd_status = fd->fd_rescount = 0;

		fd->fd_branch = branch | 0x01;
		branch += sizeof(struct fwohci_desc);

		/* physical addr to data? */
		fd->fd_data =
		    (u_int32_t)((irc->irc_buf_segs[bufno].ds_addr + bufused));
		bufused += irc->irc_maxsize;
		if (bufused > irc->irc_buf_segs[bufno].ds_len) {
			bufused = 0;
			if (++bufno == irc->irc_buf_nsegs) {
				/* fail */
				printf("fwohci_ir_buf_setup fail\n");

				fwohci_misc_dmabuf_free(irc->irc_sc->sc_dmat,
				    irc->irc_desc_size,
				    irc->irc_desc_nsegs, &irc->irc_desc_seg,
				    &irc->irc_desc_dmamap,
				    (caddr_t)irc->irc_desc_map);
				fwohci_misc_dmabuf_free(irc->irc_sc->sc_dmat,
				    irc->irc_buf_totalsize,
				    irc->irc_buf_nsegs, irc->irc_buf_segs,
				    &irc->irc_buf_dmamap,
				    (caddr_t)irc->irc_buf);
				return -1;
			}
		}

#ifdef FWOHCI_DEBUG
		if (fd < irc->irc_desc_map + 4
		    || (fd > irc->irc_desc_map + irc->irc_desc_num - 4)) {
			printf("fwohci_ir_buf_setup: desc %d %p buf %08x"
			    " size %d branch %08x\n",
			    fd - irc->irc_desc_map, fd, fd->fd_data,
			    fd->fd_reqcount, fd->fd_branch);
		}
#endif /* FWOHCI_DEBUG */
	}

	--fd;
	fd->fd_branch = irc->irc_desc_dmamap->dm_segs[0].ds_addr | 1;
	DPRINTF(("fwohci_ir_buf_setup: desc %d %p buf %08x size %d branch %08x\n",
	    fd - irc->irc_desc_map, fd, fd->fd_data, fd->fd_reqcount,
	    fd->fd_branch));

	return 0;
}



/*
 * static void fwohci_ir_init(struct fwohci_ir_ctx *irc)
 *
 *	This function initialise DMA engine.
 */
static int
fwohci_ir_init(struct fwohci_ir_ctx *irc)
{
	struct fwohci_softc *sc = irc->irc_sc;
	int n = irc->irc_num;
	u_int32_t ctxmatch;

	ctxmatch = irc->irc_channel & IEEE1394_ISO_CHANNEL_MASK;

	if (irc->irc_channel & IEEE1394_ISO_CHANNEL_ANY) {
		OHCI_SYNC_RX_DMA_WRITE(sc, n,
		    OHCI_SUBREG_ContextControlSet,
		    OHCI_CTXCTL_RX_MULTI_CHAN_MODE);

		/* Receive all the isochronous channels */
		OHCI_CSR_WRITE(sc, OHCI_REG_IRMultiChanMaskHiSet, 0xffffffff);
		OHCI_CSR_WRITE(sc, OHCI_REG_IRMultiChanMaskLoSet, 0xffffffff);
		ctxmatch = 0;
	}

	ctxmatch |= ((irc->irc_tagbm & 0x0f) << OHCI_CTXMATCH_TAG_BITPOS);
	OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_ContextMatch, ctxmatch);

	OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_ContextControlClear,
	    OHCI_CTXCTL_RX_BUFFER_FILL | OHCI_CTXCTL_RX_CYCLE_MATCH_ENABLE);
	OHCI_SYNC_RX_DMA_WRITE(sc, n, OHCI_SUBREG_ContextControlSet,
	    OHCI_CTXCTL_RX_ISOCH_HEADER);

	printf("fwohci_ir_init\n");

	return 0;
}


/*
 * static int fwohci_ir_start(struct fwohci_ir_ctx *irc)
 *
 *	This function starts DMA engine.  This function must call
 *	after fwohci_ir_init() and active bit of context control
 *	register negated.  This function will not check it.
 */
static int
fwohci_ir_start(struct fwohci_ir_ctx *irc)
{
	struct fwohci_softc *sc = irc->irc_sc;
	int startidx = irc->irc_readtop - irc->irc_desc_map;
	u_int32_t startaddr;

	startaddr = irc->irc_desc_dmamap->dm_segs[0].ds_addr
	    + sizeof(struct fwohci_desc)*startidx;

	OHCI_SYNC_RX_DMA_WRITE(sc, irc->irc_num, OHCI_SUBREG_CommandPtr,
	    startaddr | 1);
	OHCI_CSR_WRITE(sc, OHCI_REG_IsoRecvIntEventClear,
		    (1 << irc->irc_num));
	OHCI_SYNC_RX_DMA_WRITE(sc, irc->irc_num,
	    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);

	printf("fwohci_ir_start: CmdPtr %08x Ctx %08x startidx %d\n",
	    OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num, OHCI_SUBREG_CommandPtr),
	    OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num, OHCI_SUBREG_ContextControlSet),
	    startidx);

	irc->irc_status &= ~IRC_STATUS_READY;
	irc->irc_status |= IRC_STATUS_RUN;

	if ((irc->irc_flags & IEEE1394_IR_TRIGGER_CIP_SYNC) == 0) {
		irc->irc_status |= IRC_STATUS_RECEIVE;
	}

	return 0;
}



/*
 * static int fwohci_ir_stop(struct fwohci_ir_ctx *irc)
 *
 *	This function stops DMA engine.
 */
static int
fwohci_ir_stop(struct fwohci_ir_ctx *irc)
{
	struct fwohci_softc *sc = irc->irc_sc;
	int i;

	printf("fwohci_ir_stop\n");

	OHCI_SYNC_RX_DMA_WRITE(sc, irc->irc_num,
	    OHCI_SUBREG_ContextControlClear,
	    OHCI_CTXCTL_RUN | OHCI_CTXCTL_DEAD);

	i = 0;
	while (OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
	    OHCI_SUBREG_ContextControlSet) & OHCI_CTXCTL_ACTIVE) {
#if 0
		u_int32_t reg = OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
		    OHCI_SUBREG_ContextControlClear);

		printf("%s: %d intr IR_CommandPtr 0x%08x "
		    "ContextCtrl 0x%08x%s%s%s%s\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, i,
		    OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
			OHCI_SUBREG_CommandPtr),
		    reg,
		    reg & OHCI_CTXCTL_RUN ? " run" : "",
		    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
		    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
		    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");
#endif
		if (i > 20) {
			printf("fwohci_ir_stop: %s does not stop\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname);
			return 1;
		}
		DELAY(10);
	}

	irc->irc_status &= ~IRC_STATUS_RUN;

	return 0;
}






static void
fwohci_ir_intr(struct fwohci_softc *sc, struct fwohci_ir_ctx *irc)
{
	const char *xname = sc->sc_sc1394.sc1394_dev.dv_xname;
	u_int32_t cmd, ctx;
	int idx;
	struct fwohci_desc *fd;

	sc->sc_isocnt.ev_count++;

	if (!(irc->irc_status & IRC_STATUS_RUN)) {
		printf("fwohci_ir_intr: not running\n");
		return;
	}

	bus_dmamap_sync(sc->sc_dmat, irc->irc_desc_dmamap,
	    0, irc->irc_desc_size, BUS_DMASYNC_PREREAD);

	ctx = OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
	    OHCI_SUBREG_ContextControlSet);

	cmd = OHCI_SYNC_RX_DMA_READ(sc, irc->irc_num,
	    OHCI_SUBREG_CommandPtr);

#define OHCI_CTXCTL_RUNNING (OHCI_CTXCTL_RUN|OHCI_CTXCTL_ACTIVE)
#define OHCI_CTXCTL_RUNNING_MASK (OHCI_CTXCTL_RUNNING|OHCI_CTXCTL_DEAD)

	idx = (cmd & 0xfffffff8) - (u_int32_t)irc->irc_desc_dmamap->dm_segs[0].ds_addr;
	idx /= sizeof(struct fwohci_desc);

	if ((ctx & OHCI_CTXCTL_RUNNING_MASK) == OHCI_CTXCTL_RUNNING) {
		if (irc->irc_waitchan != NULL) {
			DPRINTF(("fwohci_ir_intr: wakeup "
			    "ctx %d CmdPtr %08x Ctxctl %08x idx %d\n",
			    irc->irc_num, cmd, ctx, idx));
#ifdef FWOHCI_WAIT_DEBUG
			irc->irc_cycle[1] = fwohci_cycletimer(irc->irc_sc);
#endif
			wakeup((void *)irc->irc_waitchan);
		}
		selwakeup(&irc->irc_sel);
		return;
	}

	fd = irc->irc_desc_map + idx;

	printf("fwohci_ir_intr: %s error "
	    "ctx %d CmdPtr %08x Ctxctl %08x idx %d\n", xname,
	    irc->irc_num, cmd, ctx, idx);
	printf("\tfd flag %x branch %x stat %x rescnt %x total pkt %d\n",
	    fd->fd_flags, fd->fd_branch, fd->fd_status,fd->fd_rescount,
	    irc->irc_pktcount);
}




/*
 * static int fwohci_ir_ctx_packetnum(struct fwohci_ir_ctx *irc)
 *
 *	This function obtains the lenth of descriptors with data.
 */
static int
fwohci_ir_ctx_packetnum(struct fwohci_ir_ctx *irc)
{
	struct fwohci_desc *fd = irc->irc_readtop;
	int i = 0;

	/* XXX SYNC */
	while (fd->fd_status != 0) {
		if (fd == irc->irc_readtop && i > 0) {
			printf("descriptor filled %d at %d\n", i,
			    irc->irc_pktcount);
#ifdef FWOHCI_WAIT_DEBUG
			irc->irc_cycle[2] = fwohci_cycletimer(irc->irc_sc);
			printf("cycletimer %d:%d %d:%d %d:%d\n",
			    irc->irc_cycle[0]>>13, irc->irc_cycle[0]&0x1fff,
			    irc->irc_cycle[1]>>13, irc->irc_cycle[1]&0x1fff,
			    irc->irc_cycle[2]>>13, irc->irc_cycle[2]&0x1fff);
#endif

			break;
		}

		++i;
		++fd;
		if (fd == irc->irc_desc_map + irc->irc_desc_num) {
			fd = irc->irc_desc_map;
		}

	}

	return i;
}




/*
 * int fwohci_ir_read(struct device *dev, ieee1394_ir_tag_t tag,
 *		      struct uio *uio, int headoffs, int flags)
 *
 *	This function reads data from fwohci's isochronous receive
 *	buffer.
 */
int
fwohci_ir_read(struct device *dev, ieee1394_ir_tag_t tag, struct uio *uio,
    int headoffs, int flags)
{
	struct fwohci_ir_ctx *irc = (struct fwohci_ir_ctx *)tag;
	int packetnum;
	int copylen, hdrshim, fwisohdrsiz;
	struct fwohci_desc *fd, *fdprev;
	u_int8_t *data;
	int status = 0;
	u_int32_t tmpbranch;
	int pktcount_prev = irc->irc_pktcount;
#ifdef FW_DEBUG
	int totalread = 0;
#endif

	if (irc->irc_status & IRC_STATUS_READY) {
		printf("fwohci_ir_read: starting iso read engine\n");
		fwohci_ir_start(irc);
	}

	packetnum = fwohci_ir_ctx_packetnum(irc);

	DPRINTF(("fwohci_ir_read resid %d DMA buf %d\n",
	    uio->uio_resid, packetnum));

	if (packetnum == 0) {
		return EAGAIN;
	}

#ifdef USEDRAIN
	if (packetnum > irc->irc_desc_num - irc->irc_desc_num/4) {
		packetnum -= fwohci_ir_ctx_drain(irc);
		if (irc->irc_pktcount != 0) {
			printf("fwohci_ir_read overrun %d\n",
			    irc->irc_pktcount);
		}
	}
#endif /* USEDRAIN */

	fd = irc->irc_readtop;

#if 0
	if ((irc->irc_status & IRC_STATUS_RECEIVE) == 0
	    && irc->irc_flags & IEEE1394_IR_TRIGGER_CIP_SYNC) {
		unsigned int s;
		int i = 0;

		fdprev = fd;
		while (fd->fd_status != 0) {
			s = data[14] << 8;
			s |= data[15];

			if (s != 0x0000ffffu) {
				DPRINTF(("find header %x at %d\n",
				    s, irc->irc_pktcount));
				irc->irc_status |= IRC_STATUS_RECEIVE;
				break;
			}

			fd->fd_rescount = 0;
			fd->fd_status = 0;

			fdprev = fd;
			if (++fd == irc->irc_desc_map + irc->irc_desc_num) {
				fd = irc->irc_desc_map;
				data = irc->irc_buf;
			}
			++i;
		}

		/* XXX SYNC */
		if (i > 0) {
			tmpbranch = fdprev->fd_branch;
			fdprev->fd_branch = 0;
			irc->irc_writeend->fd_branch = irc->irc_savedbranch;
			irc->irc_writeend = fdprev;
			irc->irc_savedbranch = tmpbranch;
		}
		/* XXX SYNC */

		if (fd->fd_status == 0) {
			return EAGAIN;
		}
	}
#endif

	hdrshim = 8;
	fwisohdrsiz = 0;
	data = irc->irc_buf + (fd - irc->irc_desc_map) * irc->irc_maxsize;
	if (irc->irc_flags & IEEE1394_IR_NEEDHEADER) {
		fwisohdrsiz = sizeof(struct fwiso_header);
	}

	while (fd->fd_status != 0 &&
	    (copylen = fd->fd_reqcount - fd->fd_rescount - hdrshim - headoffs)
	    + fwisohdrsiz < uio->uio_resid) {

		DPRINTF(("pkt %04x:%04x uiomove %p, %d\n",
		    fd->fd_status, fd->fd_rescount,
		    (void *)(data + 8 + headoffs), copylen));
		if ((irc->irc_status & IRC_STATUS_RECEIVE) == 0) {
			DPRINTF(("[%d]", copylen));
			if (irc->irc_pktcount > 1000) {
				printf("no header found\n");
				status = EIO;
				break; /* XXX */
			}
		} else {
			DPRINTF(("<%d>", copylen));
		}

		if ((irc->irc_status & IRC_STATUS_RECEIVE) == 0
		    && irc->irc_flags & IEEE1394_IR_TRIGGER_CIP_SYNC
		    && copylen > 0) {
			unsigned int s;

			s = data[14] << 8;
			s |= data[15];

			if (s != 0x0000ffffu) {
				DPRINTF(("find header %x at %d\n",
				    s, irc->irc_pktcount));
				irc->irc_status |= IRC_STATUS_RECEIVE;
			}
		}

		if (irc->irc_status & IRC_STATUS_RECEIVE) {
			if (copylen > 0) {
				if (irc->irc_flags & IEEE1394_IR_NEEDHEADER) {
					struct fwiso_header fh;

					fh.fh_timestamp = htonl((*(u_int32_t *)data) & 0xffff);
					fh.fh_speed = htonl((fd->fd_status >> 5)& 0x00000007);
					fh.fh_capture_size = htonl(copylen + 4);
					fh.fh_iso_header = htonl(*(u_int32_t *)(data + 4));
					status = uiomove((void *)&fh,
					    sizeof(fh), uio);
					if (status != 0) {
						/* An error happens */
						printf("uio error in hdr\n");
						break;
					}
				}
				status = uiomove((void *)(data + 8 + headoffs),
				    copylen, uio);
				if (status != 0) {
					/* An error happens */
					printf("uio error\n");
					break;
				}
#ifdef FW_DEBUG
				totalread += copylen;
#endif
			}
		}

		fd->fd_rescount = 0;
		fd->fd_status = 0;

#if 0
		/* advance writeend pointer and fill branch */

		tmpbranch = fd->fd_branch;
		fd->fd_branch = 0;
		irc->irc_writeend->fd_branch = irc->irc_savedbranch;
		irc->irc_writeend = fd;
		irc->irc_savedbranch = tmpbranch;
#endif
		fdprev = fd;

		data += irc->irc_maxsize;
		if (++fd == irc->irc_desc_map + irc->irc_desc_num) {
			fd = irc->irc_desc_map;
			data = irc->irc_buf;
		}
		++irc->irc_pktcount;
	}

#if 1
	if (irc->irc_pktcount != pktcount_prev) {
		/* XXX SYNC */
		tmpbranch = fdprev->fd_branch;
		fdprev->fd_branch = 0;
		irc->irc_writeend->fd_branch = irc->irc_savedbranch;
		irc->irc_writeend = fdprev;
		irc->irc_savedbranch = tmpbranch;
		/* XXX SYNC */
	}
#endif

	if (!(OHCI_SYNC_RX_DMA_READ(irc->irc_sc, irc->irc_num,
	    OHCI_SUBREG_ContextControlClear) & OHCI_CTXCTL_ACTIVE)) {
		/* do wake */
		OHCI_SYNC_RX_DMA_WRITE(irc->irc_sc, irc->irc_num,
		    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_WAKE);
	}

	if (packetnum > irc->irc_maxqueuelen) {
		irc->irc_maxqueuelen = packetnum;
		irc->irc_maxqueuepos = irc->irc_pktcount;
	}

	if (irc->irc_pktcount == pktcount_prev) {
#if 0
		printf("fwohci_ir_read: process 0 packet, total %d\n",
		    irc->irc_pktcount);
		if (++pktfail > 30) {
			return 0;
		}
#endif
		return EAGAIN;
	}

	irc->irc_readtop = fd;

	DPRINTF(("fwochi_ir_read: process %d packet, total %d\n",
	    totalread, irc->irc_pktcount));

	return status;
}




/*
 * int fwohci_ir_wait(struct device *dev, ieee1394_ir_tag_t tag,
 *		      void *wchan, char *name)
 *
 *	This function waits till new data comes.
 */
int
fwohci_ir_wait(struct device *dev, ieee1394_ir_tag_t tag, void *wchan, char *name)
{
	struct fwohci_ir_ctx *irc = (struct fwohci_ir_ctx *)tag;
	struct fwohci_desc *fd;
	int pktnum;
	int stat;

	if ((pktnum = fwohci_ir_ctx_packetnum(irc)) > 4) {
		DPRINTF(("fwohci_ir_wait enough data %d\n", pktnum));
		return 0;
	}

	fd = irc->irc_readtop + 32;
	if (fd >= irc->irc_desc_map + irc->irc_desc_num) {
		fd -= irc->irc_desc_num;
	}

	irc->irc_waitchan = wchan;
	if ((irc->irc_flags & IEEE1394_IR_SHORTDELAY) == 0) {
		fd->fd_flags |= OHCI_DESC_INTR_ALWAYS;
		DPRINTF(("fwohci_ir_wait stops %d set intr %d\n",
		    irc->irc_readtop - irc->irc_desc_map,
		    fd - irc->irc_desc_map));
		/* XXX SYNC */
	}

#ifdef FWOHCI_WAIT_DEBUG
	irc->irc_cycle[0] = fwohci_cycletimer(irc->irc_sc);
#endif

	irc->irc_status |= IRC_STATUS_SLEEPING;
	if ((stat = tsleep(wchan, PCATCH|PRIBIO, name, hz*10)) != 0) {
		irc->irc_waitchan = NULL;
		fd->fd_flags &= ~OHCI_DESC_INTR_ALWAYS;
		if (stat == EWOULDBLOCK) {
			printf("fwohci_ir_wait: timeout\n");
			return EIO;
		} else {
			return EINTR;
		}
	}

	irc->irc_waitchan = NULL;
	if ((irc->irc_flags & IEEE1394_IR_SHORTDELAY) == 0) {
		fd->fd_flags &= ~OHCI_DESC_INTR_ALWAYS;
		/* XXX SYNC */
	}

	DPRINTF(("fwohci_ir_wait: wakeup\n"));

	return 0;
}




/*
 * int fwohci_ir_select(struct device *dev, ieee1394_ir_tag_t tag,
 *			   struct proc *p)
 *
 *	This function returns the number of packets in queue.
 */
int
fwohci_ir_select(struct device *dev, ieee1394_ir_tag_t tag, struct proc *p)
{
	struct fwohci_ir_ctx *irc = (struct fwohci_ir_ctx *)tag;
	int pktnum;

	if (irc->irc_status & IRC_STATUS_READY) {
		printf("fwohci_ir_select: starting iso read engine\n");
		fwohci_ir_start(irc);
	}

	if ((pktnum = fwohci_ir_ctx_packetnum(irc)) == 0) {
		selrecord(p, &irc->irc_sel);
	}

	return pktnum;
}



#ifdef USEDRAIN
/*
 * int fwohci_ir_ctx_drain(struct fwohci_ir_ctx *irc)
 *
 *	This function will drain all the packets in receive DMA
 *	buffer.
 */
static int
fwohci_ir_ctx_drain(struct fwohci_ir_ctx *irc)
{
	struct fwohci_desc *fd = irc->irc_readtop;
	u_int32_t reg;
	int count = 0;

	reg = OHCI_SYNC_RX_DMA_READ(irc->irc_sc, irc->irc_num,
	    OHCI_SUBREG_ContextControlClear);

	printf("fwohci_ir_ctx_drain ctx%s%s%s%s\n",
	    reg & OHCI_CTXCTL_RUN ? " run" : "",
	    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
	    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
	    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");

	if ((reg & OHCI_CTXCTL_RUNNING_MASK) == OHCI_CTXCTL_RUN) {
		/* DMA engine is stopped */
		u_int32_t startadr;

		for (fd = irc->irc_desc_map;
		     fd < irc->irc_desc_map + irc->irc_desc_num;
		     ++fd) {
			fd->fd_status = 0;
		}

		/* Restore branch addr of the last descriptor */
		irc->irc_writeend->fd_branch = irc->irc_savedbranch;

		irc->irc_readtop = irc->irc_desc_map;
		irc->irc_writeend = irc->irc_desc_map + irc->irc_desc_num - 1;
		irc->irc_savedbranch = irc->irc_writeend->fd_branch;
		irc->irc_writeend->fd_branch = 0;

		count = irc->irc_desc_num;

		OHCI_SYNC_RX_DMA_WRITE(irc->irc_sc, irc->irc_num,
		    OHCI_SUBREG_ContextControlClear,
		    OHCI_CTXCTL_RUN | OHCI_CTXCTL_DEAD);

		startadr = (u_int32_t)irc->irc_desc_dmamap->dm_segs[0].ds_addr;

		printf("fwohci_ir_ctx_drain: remove %d pkts\n", count);

		OHCI_SYNC_RX_DMA_WRITE(irc->irc_sc, irc->irc_num,
		    OHCI_SUBREG_CommandPtr, startadr | 1);

		OHCI_SYNC_RX_DMA_WRITE(irc->irc_sc, irc->irc_num,
		    OHCI_SUBREG_ContextControlSet, OHCI_CTXCTL_RUN);
	} else {
		const int removecount = irc->irc_desc_num/2;
		u_int32_t tmpbranch;

		for (count = 0; count < removecount; ++count) {
			if (fd->fd_status == 0) {
				break;
			}

			fd->fd_status = 0;

			tmpbranch = fd->fd_branch;
			fd->fd_branch = 0;
			irc->irc_writeend->fd_branch = irc->irc_savedbranch;
			irc->irc_writeend = fd;
			irc->irc_savedbranch = tmpbranch;

			if (++fd == irc->irc_desc_map + irc->irc_desc_num) {
				fd = irc->irc_desc_map;
			}
			++count;
		}

		printf("fwohci_ir_ctx_drain: remove %d pkts\n", count);
	}

	return count;
}
#endif /* USEDRAIN */









/*
 * service routines for isochronous transmit
 */


struct fwohci_it_ctx *
fwohci_it_ctx_construct(struct fwohci_softc *sc, int no, int ch, int tag, int maxsize)
{
	struct fwohci_it_ctx *itc;
	size_t dmastrsize;
	struct fwohci_it_dmabuf *dmastr;
	struct fwohci_desc *desc;
	bus_addr_t descphys;
	int nodesc;
	int i, j;

	if ((itc = malloc(sizeof(*itc), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) {
		return itc;
	}

	itc->itc_num = no;
	itc->itc_flags = 0;
	itc->itc_sc = sc;
	itc->itc_bufnum = FWOHCI_IT_BUFNUM;

	itc->itc_channel = ch;
	itc->itc_tag = tag;
	itc->itc_speed = OHCI_CTXCTL_SPD_100; /* XXX */

	itc->itc_outpkt = 0;

	itc->itc_maxsize = maxsize;

	dmastrsize = sizeof(struct fwohci_it_dmabuf)*itc->itc_bufnum;

	if ((dmastr = malloc(dmastrsize, M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) {
		goto error_1;
	}
	itc->itc_buf = dmastr;

	/*
	 * Get memory for descriptors.  One buffer will have 256
	 * packet entry and 1 trailing descriptor for writing scratch.
	 * 4-byte space for scratch.
	 */
	itc->itc_descsize = (256*3 + 1)*itc->itc_bufnum;

	if (fwohci_it_desc_alloc(itc)) {
		printf("%s: cannot get enough memory for descriptor\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname);
		goto error_2;
	}

	/* prepare DMA buffer */
	nodesc = itc->itc_descsize/itc->itc_bufnum;
	desc = (struct fwohci_desc *)itc->itc_descmap;
	descphys = itc->itc_dseg.ds_addr;

	for (i = 0; i < itc->itc_bufnum; ++i) {

		if (fwohci_itd_construct(itc, &dmastr[i], i, desc,
		    descphys, nodesc,
		    itc->itc_maxsize, itc->itc_scratch_paddr)) {
			goto error_3;
		}
		desc += nodesc;
		descphys += sizeof(struct fwohci_desc)*nodesc;
	}

#if 1
	itc->itc_buf_start = itc->itc_buf;
	itc->itc_buf_end = itc->itc_buf;
	itc->itc_buf_linkend = itc->itc_buf;
#else
	itc->itc_bufidx_start = 0;
	itc->itc_bufidx_end = 0;
	itc->itc_bufidx_linkend = 0;
#endif
	itc->itc_buf_cnt = 0;
	itc->itc_waitchan = NULL;
	*itc->itc_scratch = 0xffffffff;

	return itc;

 error_3:
	for (j = 0; j < i; ++j) {
		fwohci_itd_destruct(&dmastr[j]);
	}
	fwohci_it_desc_free(itc);
 error_2:
	free(itc->itc_buf, M_DEVBUF);
 error_1:
	free(itc, M_DEVBUF);

	return NULL;
}



void
fwohci_it_ctx_destruct(struct fwohci_it_ctx *itc)
{
	int i;

	for (i = 0; i < itc->itc_bufnum; ++i) {
		fwohci_itd_destruct(&itc->itc_buf[i]);
	}

	fwohci_it_desc_free(itc);
	free(itc, M_DEVBUF);
}


/*
 * static int fwohci_it_desc_alloc(struct fwohci_it_ctx *itc)
 *
 *	Allocates descriptors for context DMA dedicated for
 *	isochronous transmit.
 *
 *	This function returns 0 (zero) if it succeeds.  Otherwise,
 *	return negative value.
 */
static int
fwohci_it_desc_alloc(struct fwohci_it_ctx *itc)
{
	bus_dma_tag_t dmat = itc->itc_sc->sc_dmat;
	const char *xname = itc->itc_sc->sc_sc1394.sc1394_dev.dv_xname;
	int error, dsize;

	/* add for scratch */
	itc->itc_descsize++;

	/* rounding up to 256 */
	if ((itc->itc_descsize & 0x0ff) != 0) {
		itc->itc_descsize =
		    (itc->itc_descsize & ~0x0ff) + 0x100;
	}
	/* remove for scratch */

	itc->itc_descsize--;
	printf("%s: fwohci_it_desc_alloc will allocate %d descs\n",
	    xname, itc->itc_descsize);

	/*
	 * allocate descriptor buffer
	 */
	dsize = sizeof(struct fwohci_desc) * itc->itc_descsize;

	printf("%s: fwohci_it_desc_alloc: descriptor %d, dsize %d\n",
	    xname, itc->itc_descsize, dsize);

	if ((error = bus_dmamem_alloc(dmat, dsize, PAGE_SIZE, 0,
	    &itc->itc_dseg, 1, &itc->itc_dnsegs, 0)) != 0) {
		printf("%s: unable to allocate descriptor buffer, error = %d\n",
		    xname, error);
		goto fail_0;
	}

	printf("fwohci_it_desc_alloc: %d segment[s]\n", itc->itc_dnsegs);

	if ((error = bus_dmamem_map(dmat, &itc->itc_dseg,
	    itc->itc_dnsegs, dsize, (caddr_t *)&itc->itc_descmap,
	    BUS_DMA_COHERENT | BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to map descriptor buffer, error = %d\n",
		    xname, error);
		goto fail_1;
	}

	printf("fwohci_it_desc_alloc: bus_dmamem_map success dseg %lx:%lx\n",
	    (long)itc->itc_dseg.ds_addr, (long)itc->itc_dseg.ds_len);

	if ((error = bus_dmamap_create(dmat, dsize, itc->itc_dnsegs,
	    dsize, 0, BUS_DMA_WAITOK, &itc->itc_ddmamap)) != 0) {
		printf("%s: unable to create descriptor buffer DMA map, "
		    "error = %d\n", xname, error);
		goto fail_2;
	}

	printf("fwohci_it_desc_alloc: bus_dmamem_create success\n");

	{
		int loop;

		for (loop = 0; loop < itc->itc_ddmamap->dm_nsegs; ++loop) {
			printf("\t%.2d: 0x%lx - 0x%lx\n", loop,
			    (long)itc->itc_ddmamap->dm_segs[loop].ds_addr,
			    (long)itc->itc_ddmamap->dm_segs[loop].ds_addr +
			    (long)itc->itc_ddmamap->dm_segs[loop].ds_len - 1);
		}
	}

	if ((error = bus_dmamap_load(dmat, itc->itc_ddmamap,
	    itc->itc_descmap, dsize, NULL, BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to load descriptor buffer DMA map, "
		    "error = %d\n", xname, error);
		goto fail_3;
	}

	printf("%s: fwohci_it_desc_alloc: get DMA memory phys:0x%08x vm:%p\n",
	    xname, (int)itc->itc_ddmamap->dm_segs[0].ds_addr, itc->itc_descmap);

	itc->itc_scratch = (u_int32_t *)(itc->itc_descmap
	    + (sizeof(struct fwohci_desc))*itc->itc_descsize);
	itc->itc_scratch_paddr =
	    itc->itc_ddmamap->dm_segs[0].ds_addr
	    + (sizeof(struct fwohci_desc))*itc->itc_descsize;

	printf("%s: scratch %p, 0x%x\n", xname, itc->itc_scratch,
	    (int)itc->itc_scratch_paddr);

	/* itc->itc_scratch_paddr = vtophys(itc->itc_scratch); */

	return 0;

  fail_3:
	bus_dmamap_destroy(dmat, itc->itc_ddmamap);
  fail_2:
	bus_dmamem_unmap(dmat, (caddr_t)itc->itc_descmap, dsize);
  fail_1:
	bus_dmamem_free(dmat, &itc->itc_dseg, itc->itc_dnsegs);
  fail_0:
	itc->itc_dnsegs = 0;
	itc->itc_descmap = NULL;
	return error;
}


static void
fwohci_it_desc_free(struct fwohci_it_ctx *itc)
{
	bus_dma_tag_t dmat = itc->itc_sc->sc_dmat;
	int dsize = sizeof(struct fwohci_desc) * itc->itc_descsize + 4;

	bus_dmamap_destroy(dmat, itc->itc_ddmamap);
	bus_dmamem_unmap(dmat, (caddr_t)itc->itc_descmap, dsize);
	bus_dmamem_free(dmat, &itc->itc_dseg, itc->itc_dnsegs);

	itc->itc_dnsegs = 0;
	itc->itc_descmap = NULL;
}



/*
 * int fwohci_it_ctx_writedata(ieee1394_it_tag_t it, int ndata,
 *		struct ieee1394_it_datalist *itdata, int flags)
 *
 *	This function will write packet data to DMA buffer in the
 *	context.  This function will parse ieee1394_it_datalist
 *	command and fill DMA buffer.  This function will return the
 *	number of written packets, or error code if the return value
 *	is negative.
 *
 *	When this funtion returns positive value but smaller than
 *	ndata, it reaches at the ent of DMA buffer.
 */
int
fwohci_it_ctx_writedata(ieee1394_it_tag_t it, int ndata,
    struct ieee1394_it_datalist *itdata, int flags)
{
	struct fwohci_it_ctx *itc = (struct fwohci_it_ctx *)it;
	int rv;
	int writepkt = 0;
	struct fwohci_it_dmabuf *itd;
	int i = 0;

	itd = itc->itc_buf_end;

	while (ndata > 0) {
		int s;

		if (fwohci_itd_isfull(itd) || fwohci_itd_islocked(itd)) {
			if (itc->itc_buf_cnt == itc->itc_bufnum) {
				/* no space to write */
				printf("sleeping: start linkend end %d %d %d "
				    "bufcnt %d\n",
				    itc->itc_buf_start->itd_num,
				    itc->itc_buf_linkend->itd_num,
				    itc->itc_buf_end->itd_num,
				    itc->itc_buf_cnt);

				itc->itc_waitchan = itc;
				if (tsleep((void *)itc->itc_waitchan,
				    PCATCH, "fwohci it", 0) == EWOULDBLOCK) {
					itc->itc_waitchan = NULL;
					printf("fwohci0 signal\n");
					break;
				}
				printf("waking:   start linkend end %d %d %d\n",
				    itc->itc_buf_start->itd_num,
				    itc->itc_buf_linkend->itd_num,
				    itc->itc_buf_end->itd_num);

				itc->itc_waitchan = itc;
				i = 0;
			} else {
				/*
				 * Use next buffer.  This DMA buffer is full
				 * or locked.
				 */
				INC_BUF(itc, itd);
			}
		}

		if (++i > 10) {
			panic("why loop so much %d", itc->itc_buf_cnt);
			break;
		}

		s = splbio();

		if (fwohci_itd_hasdata(itd) == 0) {
			++itc->itc_buf_cnt;
			DPRINTF(("<buf cnt %d>\n", itc->itc_buf_cnt));
		}

		rv = fwohci_itd_writedata(itd, ndata, itdata);
		DPRINTF(("fwohci_it_ctx_writedata: buf %d ndata %d rv %d\n",
		    itd->itd_num, ndata, rv));

		if (itc->itc_buf_start == itc->itc_buf_linkend
		    && (itc->itc_flags & ITC_FLAGS_RUN) != 0) {

#ifdef DEBUG_USERADD
			printf("fwohci_it_ctx_writedata: emergency!\n");
#endif
			if (itc->itc_buf_linkend != itc->itc_buf_end
			    && fwohci_itd_hasdata(itc->itc_buf_end)) {
				struct fwohci_it_dmabuf *itdn = itc->itc_buf_linkend;

				INC_BUF(itc, itdn);
				printf("connecting %d after %d\n",
				    itdn->itd_num,
				    itc->itc_buf_linkend->itd_num);
				if (fwohci_itd_link(itc->itc_buf_linkend, itdn)) {
					printf("fwohci_it_ctx_writedata:"
					    " cannot link correctly\n");
					return -1;
				}
				itc->itc_buf_linkend = itdn;
			}
		}

		splx(s);

		if (rv < 0) {
			/* some errors happend */
			break;
		}

		writepkt += rv;
		ndata -= rv;
		itdata += rv;
		itc->itc_buf_end = itd;
	}

	/* Start DMA engine if stopped */
	if ((itc->itc_flags & ITC_FLAGS_RUN) == 0) {
		if (itc->itc_buf_cnt > itc->itc_bufnum - 1 || flags) {
			/* run */
			printf("fwohci_itc_ctl_writedata: DMA engine start\n");
			fwohci_it_ctx_run(itc);
		}
	}

	return writepkt;
}



static void
fwohci_it_ctx_run(struct fwohci_it_ctx *itc)
{
	struct fwohci_softc *sc = itc->itc_sc;
	int ctx = itc->itc_num;
	struct fwohci_it_dmabuf *itd
	    = (struct fwohci_it_dmabuf *)itc->itc_buf_start;
	u_int32_t reg;
	int i;

	if (itc->itc_flags & ITC_FLAGS_RUN) {
		return;
	}
	itc->itc_flags |= ITC_FLAGS_RUN;

	/*
	 * dirty, but I can't imagine better place to save branch addr
	 * of top DMA buffer and substitute 0 to it.
	 */
	itd->itd_savedbranch = itd->itd_lastdesc->fd_branch;
	itd->itd_lastdesc->fd_branch = 0;

	if (itc->itc_buf_cnt > 1) {
		struct fwohci_it_dmabuf *itdn = itd;

#if 0
		INC_BUF(itc, itdn);

		if (fwohci_itd_link(itd, itdn)) {
			printf("fwohci_it_ctx_run: cannot link correctly\n");
			return;
		}
		itc->itc_buf_linkend = itdn;
#else
		for (;;) {
			INC_BUF(itc, itdn);

			if (itdn == itc->itc_buf_end) {
				break;
			}
			if (fwohci_itd_link(itd, itdn)) {
				printf("fwohci_it_ctx_run: cannot link\n");
				return;
			}
			itd = itdn;
		}
		itc->itc_buf_linkend = itd;
#endif
	} else {
		itd->itd_lastdesc->fd_flags |= OHCI_DESC_INTR_ALWAYS;
		itc->itc_buf_linkend = itc->itc_buf_end;
		itc->itc_buf_end->itd_flags |= ITD_FLAGS_LOCK;

		/* sanity check */
		if (itc->itc_buf_end != itc->itc_buf_start) {
			printf("buf start & end differs %p %p\n",
			    itc->itc_buf_end, itc->itc_buf_start);
		}
#if 0
		{
			u_int32_t *fdp;
			u_int32_t adr;
			int i;

			printf("fwohci_it_ctx_run: itc_buf_cnt 1, DMA buf %d\n",
			    itd->itd_num);
			printf(" last desc %p npacket %d, %d 0x%04x%04x",
			    itd->itd_lastdesc, itd->itd_npacket,
			    (itd->itd_lastdesc - itd->itd_desc)/3,
			    itd->itd_lastdesc->fd_flags,
			    itd->itd_lastdesc->fd_reqcount);
			fdp = (u_int32_t *)itd->itd_desc;
			adr = (u_int32_t)itd->itd_desc_phys; /* XXX */

			for (i = 0; i < 7*4; ++i) {
				if (i % 4 == 0) {
					printf("\n%x:", adr + 4*i);
				}
				printf(" %08x", fdp[i]);
			}

			if (itd->itd_npacket > 4) {
				printf("\n...");
				i = (itd->itd_npacket - 2)*12 + 4;
			} else {
				i = 2*12 + 4;
			}
			for (;i < itd->itd_npacket*12 + 4; ++i) {
				if (i % 4 == 0) {
					printf("\n%x:", adr + 4*i);
				}
				printf(" %08x", fdp[i]);
			}
			printf("\n");
		}
#endif
	}
	{
		struct fwohci_desc *fd;

		printf("fwohci_it_ctx_run: link start linkend end %d %d %d\n",
		    itc->itc_buf_start->itd_num,
		    itc->itc_buf_linkend->itd_num,
		    itc->itc_buf_end->itd_num);

		fd = itc->itc_buf_start->itd_desc;
		if ((fd->fd_flags & 0xff00) != OHCI_DESC_STORE_VALUE) {
			printf("fwohci_it_ctx_run: start buf not with STORE\n");
		}
		fd += 3;
		if ((fd->fd_flags & OHCI_DESC_INTR_ALWAYS) == 0) {
			printf("fwohci_it_ctx_run: start buf does not have intr\n");
		}

		fd = itc->itc_buf_linkend->itd_desc;
		if ((fd->fd_flags & 0xff00) != OHCI_DESC_STORE_VALUE) {
			printf("fwohci_it_ctx_run: linkend buf not with STORE\n");
		}
		fd += 3;
		if ((fd->fd_flags & OHCI_DESC_INTR_ALWAYS) == 0) {
			printf("fwohci_it_ctx_run: linkend buf does not have intr\n");
		}
	}

	*itc->itc_scratch = 0xffffffff;

	OHCI_SYNC_TX_DMA_WRITE(sc, ctx, OHCI_SUBREG_ContextControlClear,
	    0xffff0000);
	reg = OHCI_SYNC_TX_DMA_READ(sc, ctx, OHCI_SUBREG_ContextControlSet);

	printf("fwohci_it_ctx_run start for ctx %d\n", ctx);
	printf("%s: bfr IT_CommandPtr 0x%08x ContextCtrl 0x%08x%s%s%s%s\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname,
	    OHCI_SYNC_TX_DMA_READ(sc, ctx, OHCI_SUBREG_CommandPtr),
	    reg,
	    reg & OHCI_CTXCTL_RUN ? " run" : "",
	    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
	    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
	    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");

	OHCI_SYNC_TX_DMA_WRITE(sc, ctx, OHCI_SUBREG_ContextControlClear,
	    OHCI_CTXCTL_RUN);

	reg = OHCI_SYNC_TX_DMA_READ(sc, ctx, OHCI_SUBREG_ContextControlSet);
	i = 0;
	while (reg & (OHCI_CTXCTL_ACTIVE | OHCI_CTXCTL_RUN)) {
		delay(100);
		if (++i > 1000) {
			printf("%s: cannot stop iso transmit engine\n",
			    sc->sc_sc1394.sc1394_dev.dv_xname);
			break;
		}
		reg = OHCI_SYNC_TX_DMA_READ(sc, ctx,
		    OHCI_SUBREG_ContextControlSet);
	}

	printf("%s: itm IT_CommandPtr 0x%08x ContextCtrl 0x%08x%s%s%s%s\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname,
	    OHCI_SYNC_TX_DMA_READ(sc, ctx, OHCI_SUBREG_CommandPtr),
	    reg,
	    reg & OHCI_CTXCTL_RUN ? " run" : "",
	    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
	    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
	    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");

	printf("%s: writing CommandPtr to 0x%08x\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname,
	    (int)itc->itc_buf_start->itd_desc_phys);
	OHCI_SYNC_TX_DMA_WRITE(sc, ctx, OHCI_SUBREG_CommandPtr,
	    fwohci_itd_list_head(itc->itc_buf_start) | 4);

	OHCI_SYNC_TX_DMA_WRITE(sc, ctx, OHCI_SUBREG_ContextControlSet,
	    OHCI_CTXCTL_RUN | OHCI_CTXCTL_WAKE);

	reg = OHCI_SYNC_TX_DMA_READ(sc, ctx, OHCI_SUBREG_ContextControlSet);

	printf("%s: aft IT_CommandPtr 0x%08x ContextCtrl 0x%08x%s%s%s%s\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname,
	    OHCI_SYNC_TX_DMA_READ(sc, ctx, OHCI_SUBREG_CommandPtr),
	    reg,
	    reg & OHCI_CTXCTL_RUN ? " run" : "",
	    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
	    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
	    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");
}



int
fwohci_it_ctx_flush(ieee1394_it_tag_t it)
{
	struct fwohci_it_ctx *itc = (struct fwohci_it_ctx *)it;
	int rv = 0;

	if ((itc->itc_flags & ITC_FLAGS_RUN) == 0
	    && itc->itc_buf_cnt > 0) {
		printf("fwohci_it_ctx_flush: %s flushing\n",
		    itc->itc_sc->sc_sc1394.sc1394_dev.dv_xname);

		fwohci_it_ctx_run(itc);
		rv = 1;
	}

	return rv;
}


/*
 * static void fwohci_it_intr(struct fwohci_softc *sc,
 *			      struct fwochi_it_ctx *itc)
 *
 *	This function is the interrupt handler for isochronous
 *	transmit interrupt.  This function will 1) unlink used
 *	(already transmitted) buffers, 2) link new filled buffers, if
 *	necessary and 3) say some free dma buffers exist to
 *	fwiso_write()
 */
static void
fwohci_it_intr(struct fwohci_softc *sc, struct fwohci_it_ctx *itc)
{
	struct fwohci_it_dmabuf *itd, *newstartbuf;
	u_int16_t scratchval;
	u_int32_t reg;

	reg = OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num,
	    OHCI_SUBREG_ContextControlSet);

	/* print out debug info */
#ifdef FW_DEBUG
	printf("fwohci_it_intr: CTX %d\n", itc->itc_num);

	printf("fwohci_it_intr: %s: IT_CommandPtr 0x%08x "
	    "ContextCtrl 0x%08x%s%s%s%s\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname,
	    OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num, OHCI_SUBREG_CommandPtr),
	    reg,
	    reg & OHCI_CTXCTL_RUN ? " run" : "",
	    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
	    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
	    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");
	printf("fwohci_it_intr: %s: scratch %x start %d end %d valid %d\n",
	    sc->sc_sc1394.sc1394_dev.dv_xname, *itc->itc_scratch,
	    itc->itc_buf_start->itd_num, itc->itc_buf_end->itd_num,
	    itc->itc_buf_cnt);
	{
		u_int32_t reg
		    = OHCI_CSR_READ(sc, OHCI_REG_IsochronousCycleTimer);
		printf("\t\tIsoCounter 0x%08x, %d %d %d\n", reg,
		    (reg >> 25) & 0xfe, (reg >> 12) & 0x1fff, reg & 0xfff);
	}
#endif /* FW_DEBUG */
	/* end print out debug info */

	scratchval = (*itc->itc_scratch) & 0x0000ffff;
	*itc->itc_scratch = 0xffffffff;

	if ((reg & OHCI_CTXCTL_ACTIVE) == 0 && scratchval != 0xffff) {
		/* DMA engine has been stopped */
		printf("DMA engine stopped\n");
		printf("fwohci_it_intr: %s: IT_CommandPtr 0x%08x "
		    "ContextCtrl 0x%08x%s%s%s%s\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname,
		    OHCI_SYNC_TX_DMA_READ(sc, itc->itc_num, OHCI_SUBREG_CommandPtr),
		    reg,
		    reg & OHCI_CTXCTL_RUN ? " run" : "",
		    reg & OHCI_CTXCTL_WAKE ? " wake" : "",
		    reg & OHCI_CTXCTL_DEAD ? " dead" : "",
		    reg & OHCI_CTXCTL_ACTIVE ? " active" : "");
		printf("fwohci_it_intr: %s: scratch %x start %d end %d valid %d\n",
		    sc->sc_sc1394.sc1394_dev.dv_xname, *itc->itc_scratch,
		    itc->itc_buf_start->itd_num, itc->itc_buf_end->itd_num,
		    itc->itc_buf_cnt);
		{
			u_int32_t reg
			    = OHCI_CSR_READ(sc, OHCI_REG_IsochronousCycleTimer);
			printf("\t\tIsoCounter 0x%08x, %d %d %d\n", reg,
			    (reg >> 25) & 0xfe, (reg >> 12) & 0x1fff, reg & 0xfff);
		}
		printf("\t\tbranch of lastdesc 0x%08x\n",
		    itc->itc_buf_start->itd_lastdesc->fd_branch);

		scratchval = 0xffff;
		itc->itc_flags &= ~ITC_FLAGS_RUN;
	}

	/* unlink old buffers */
	if (scratchval != 0xffff) {
		/* normal path */
		newstartbuf = &itc->itc_buf[scratchval];
	} else {
		/* DMA engine stopped */
		newstartbuf = itc->itc_buf_linkend;
		INC_BUF(itc, newstartbuf);
	}

	itd = (struct fwohci_it_dmabuf *)itc->itc_buf_start;
	itc->itc_buf_start = newstartbuf;
	while (itd != newstartbuf) {
		itc->itc_outpkt += itd->itd_npacket;
		fwohci_itd_unlink(itd);
		INC_BUF(itc, itd);
		--itc->itc_buf_cnt;
		DPRINTF(("<buf cnt %d>\n", itc->itc_buf_cnt));
	}

#ifdef DEBUG_USERADD
	if (scratchval != 0xffff) {
		printf("fwohci0: intr start %d dataend %d %d\n", scratchval,
		    itc->itc_buf_end->itd_num, itc->itc_outpkt);
	}
#endif

	if (scratchval == 0xffff) {
		/* no data supplied */
		printf("fwohci_it_intr: no it data.  output total %d\n",
		    itc->itc_outpkt);

		if (itc->itc_buf_cnt > 0) {
			printf("fwohci_it_intr: it DMA stops "
			    "w/ valid databuf %d buf %d data %d"
			    " intr reg 0x%08x\n",
			    itc->itc_buf_cnt,
			    itc->itc_buf_end->itd_num,
			    fwohci_itd_hasdata(itc->itc_buf_end),
			    OHCI_CSR_READ(sc, OHCI_REG_IntEventSet));
		} else {
			/* All the data gone */
			itc->itc_buf_start
			    = itc->itc_buf_end
			    = itc->itc_buf_linkend
			    = &itc->itc_buf[0];
			printf("fwohci_it_intr: all packets gone\n");
		}

		itc->itc_flags &= ~ITC_FLAGS_RUN;

		OHCI_SYNC_TX_DMA_WRITE(sc, itc->itc_num,
		    OHCI_SUBREG_ContextControlClear, 0xffffffff);
		OHCI_SYNC_TX_DMA_WRITE(sc, itc->itc_num,
		    OHCI_SUBREG_CommandPtr, 0);
		OHCI_SYNC_TX_DMA_WRITE(sc, itc->itc_num,
		    OHCI_SUBREG_ContextControlClear, 0x1f);

		/* send message */
		if (itc->itc_waitchan != NULL) {
			wakeup((void *)itc->itc_waitchan);
		}

		return;
	}

#if 0
	/* unlink old buffers */
	newstartbuf = &itc->itc_buf[scratchval];

	itd = (struct fwohci_it_dmabuf *)itc->itc_buf_start;
	itc->itc_buf_start = newstartbuf;
	while (itd != newstartbuf) {
		itc->itc_outpkt += itd->itd_npacket;
		fwohci_itd_unlink(itd);
		INC_BUF(itc, itd);
		--itc->itc_buf_cnt;
		DPRINTF(("<buf cnt %d>\n", itc->itc_buf_cnt));
	}
#endif

	/* sanity check */
	{
		int startidx, endidx, linkendidx;

		startidx = itc->itc_buf_start->itd_num;
		endidx = itc->itc_buf_end->itd_num;
		linkendidx = itc->itc_buf_linkend->itd_num;

		if (startidx < endidx) {
			if (linkendidx < startidx
			    || endidx < linkendidx) {
				printf("funny, linkend is not between start "
				    "and end [%d, %d]: %d\n",
				    startidx, endidx, linkendidx);
			}
		} else if (startidx > endidx) {
			if (linkendidx < startidx
			    && endidx < linkendidx) {
				printf("funny, linkend is not between start "
				    "and end [%d, %d]: %d\n",
				    startidx, endidx, linkendidx);
			}
		} else {
			if (linkendidx != startidx) {
				printf("funny, linkend is not between start "
				    "and end [%d, %d]: %d\n",
				    startidx, endidx, linkendidx);
			}

		}
	}

	/* link if some valid DMA buffers exist */
	if (itc->itc_buf_cnt > 1
	    && itc->itc_buf_linkend != itc->itc_buf_end) {
		struct fwohci_it_dmabuf *itdprev;
		int i;

		DPRINTF(("CTX %d: start linkend dataend bufs %d, %d, %d, %d\n",
		    itc->itc_num,
		    itc->itc_buf_start->itd_num,
		    itc->itc_buf_linkend->itd_num,
		    itc->itc_buf_end->itd_num,
		    itc->itc_buf_cnt));

		itd = itdprev = itc->itc_buf_linkend;
		INC_BUF(itc, itd);

#if 0
		if (fwohci_itd_isfilled(itd) || itc->itc_buf_cnt == 2) {
			while (itdprev != itc->itc_buf_end) {

				if (fwohci_itd_link(itdprev, itd)) {
					break;
				}

				itdprev = itd;
				INC_BUF(itc, itd);
			}
			itc->itc_buf_linkend = itdprev;
		}
#endif
		i = 0;
		while (itdprev != itc->itc_buf_end) {
			if (!fwohci_itd_isfilled(itd) && itc->itc_buf_cnt > 2) {
				break;
			}

			if (fwohci_itd_link(itdprev, itd)) {
				break;
			}

			itdprev = itd;
			INC_BUF(itc, itd);

			itc->itc_buf_linkend = itdprev;
			++i;
		}

		if (i > 0) {
			DPRINTF(("CTX %d: start linkend dataend bufs %d, %d, %d, %d\n",
			    itc->itc_num,
			    itc->itc_buf_start->itd_num,
			    itc->itc_buf_linkend->itd_num,
			    itc->itc_buf_end->itd_num,
			    itc->itc_buf_cnt));
		}
	} else {
		struct fwohci_it_dmabuf *le;

		le = itc->itc_buf_linkend;

		printf("CTX %d: start linkend dataend bufs %d, %d, %d, %d no buffer added\n",
			    itc->itc_num,
			    itc->itc_buf_start->itd_num,
			    itc->itc_buf_linkend->itd_num,
			    itc->itc_buf_end->itd_num,
			    itc->itc_buf_cnt);
		printf("\tlast descriptor %s %04x %08x\n",
		    le->itd_lastdesc->fd_flags & OHCI_DESC_INTR_ALWAYS ? "intr" : "",
		    le->itd_lastdesc->fd_flags,
		    le->itd_lastdesc->fd_branch);
	}

	/* send message */
	if (itc->itc_waitchan != NULL) {
		/*  */
		wakeup((void *)itc->itc_waitchan);
	}
}



/*
 * int fwohci_itd_construct(struct fwohci_it_ctx *itc,
 *			    struct fwohci_it_dmabuf *itd, int num,
 *			    struct fwohci_desc *desc, bus_addr_t phys,
 *			    int descsize, int maxsize, paddr_t scratch)
 *
 *
 *
 */
int
fwohci_itd_construct(struct fwohci_it_ctx *itc, struct fwohci_it_dmabuf *itd,
    int num, struct fwohci_desc *desc, bus_addr_t phys, int descsize,
    int maxsize, paddr_t scratch)
{
	const char *xname = itc->itc_sc->sc_sc1394.sc1394_dev.dv_xname;
	struct fwohci_desc *fd;
	struct fwohci_desc *descend;
	int npkt;
	int bufno = 0;		/* DMA segment */
	bus_size_t bufused = 0;	/* offset in a DMA segment */
	int roundsize;
	int tag = itc->itc_tag;
	int ch = itc->itc_channel;

	itd->itd_ctx = itc;
	itd->itd_num = num;

	if (descsize > 1024*3) {
		printf("%s: fwohci_itd_construct[%d] descsize %d too big\n",
		    xname, num, descsize);
		return -1;
	}

	itd->itd_desc = desc;
	itd->itd_descsize = descsize;
	itd->itd_desc_phys = phys;

	itd->itd_lastdesc = desc;
	itd->itd_npacket = 0;

	printf("%s: fwohci_itd_construct[%d] desc %p descsize %d, maxsize %d\n",
	    xname, itd->itd_num, itd->itd_desc, itd->itd_descsize, maxsize);

	if (descsize < 4) {
		/* too small descriptor array.  at least 4 */
		return -1;
	}

	/* count up how many packet can handle */
	itd->itd_maxpacket = (descsize - 1)/3;

	/* rounding up to power of 2. minimum 16 */
	roundsize = 16;
	for (roundsize = 16; roundsize < maxsize; roundsize <<= 1);
	itd->itd_maxsize = roundsize;

	printf("\t\tdesc%d [%x, %x]\n", itd->itd_num,
	    (u_int32_t)phys,
	    (u_int32_t)phys
	    + (itd->itd_maxpacket*3 + 1)*sizeof(struct fwohci_desc));
	printf("%s: fwohci_itd_construct[%d] npkt %d maxsize round up to %d\n",
	    xname, itd->itd_num, itd->itd_maxpacket, itd->itd_maxsize);

	/* obtain DMA buffer */
	if (fwohci_itd_dmabuf_alloc(itd)) {
		/* cannot allocate memory for DMA buffer */
		return -1;
	}

	/*
	 * make descriptor chain
	 *
	 * First descriptor group has a STORE_VALUE, OUTPUT_IMMEDIATE
	 * and OUTPUT_LAST descriptors Second and after that, a
	 * descriptor group has an OUTPUT_IMMEDIATE and an OUTPUT_LAST
	 * descriptor.
	 */
	descend = desc + descsize;

	/* set store value descriptor for 1st descriptor group */
	desc->fd_flags = OHCI_DESC_STORE_VALUE;
	desc->fd_reqcount = num; /* write number of DMA buffer class */
	desc->fd_data = scratch; /* at physical memory 'scratch' */
	desc->fd_branch = 0;
	desc->fd_status = desc->fd_rescount = 0;

	itd->itd_store = desc;
	itd->itd_store_phys = phys;

	++desc;
	phys += 16;

	npkt = 0;
	/* make OUTPUT_DESC chain for packets */
	for (fd = desc; fd + 2 < descend; fd += 3, ++npkt) {
		struct fwohci_desc *fi = fd;
		struct fwohci_desc *fl = fd + 2;
		u_int32_t *fi_data = (u_int32_t *)(fd + 1);

#if 0
		if (npkt > itd->itd_maxpacket - 3) {
			printf("%s: %3d fi fl %p %p\n", xname, npkt, fi,fl);
		}
#endif

		fi->fd_reqcount = 8; /* data size for OHCI command */
		fi->fd_flags = OHCI_DESC_IMMED;
		fi->fd_data = 0;
		fi->fd_branch = 0; /* branch for error */
		fi->fd_status = fi->fd_rescount = 0;

		/* channel and tag is unchanged */
		*fi_data = OHCI_ITHEADER_VAL(TAG, tag) |
		    OHCI_ITHEADER_VAL(CHAN, ch) |
		    OHCI_ITHEADER_VAL(TCODE, IEEE1394_TCODE_STREAM_DATA);
		*++fi_data = 0;
		*++fi_data = 0;
		*++fi_data = 0;

		fl->fd_flags = OHCI_DESC_OUTPUT | OHCI_DESC_LAST |
		    OHCI_DESC_BRANCH;
		fl->fd_branch =
		    (phys + sizeof(struct fwohci_desc)*(npkt + 1)*3) | 0x03;
		fl->fd_status = fl->fd_rescount = 0;

#ifdef FW_DEBUG
		if (npkt > itd->itd_maxpacket - 3) {
			DPRINTF(("%s: %3d fi fl fl branch %p %p 0x%x\n",
			    xname, npkt, fi, fl, (int)fl->fd_branch));
		}
#endif

		/* physical addr to data? */
		fl->fd_data =
		    (u_int32_t)((itd->itd_seg[bufno].ds_addr + bufused));
		bufused += itd->itd_maxsize;
		if (bufused > itd->itd_seg[bufno].ds_len) {
			bufused = 0;
			if (++bufno == itd->itd_nsegs) {
				/* fail */
				break;
			}
		}
	}

#if 0
	if (itd->itd_num == 0) {
		u_int32_t *fdp;
		u_int32_t adr;
		int i = 0;

		fdp = (u_int32_t *)itd->itd_desc;
		adr = (u_int32_t)itd->itd_desc_phys; /* XXX */

		printf("fwohci_itd_construct: audit DMA desc chain. %d\n",
		    itd->itd_maxpacket);
		for (i = 0; i < itd->itd_maxpacket*12 + 4; ++i) {
			if (i % 4 == 0) {
				printf("\n%x:", adr + 4*i);
			}
			printf(" %08x", fdp[i]);
		}
		printf("\n");

	}
#endif
	/* last branch should be 0 */
	--fd;
	fd->fd_branch = 0;

	printf("%s: pkt %d %d maxdesc %p\n",
	    xname, npkt, itd->itd_maxpacket, descend);

	return 0;
}

void
fwohci_itd_destruct(struct fwohci_it_dmabuf *itd)
{
	const char *xname = itd->itd_ctx->itc_sc->sc_sc1394.sc1394_dev.dv_xname;

	printf("%s: fwohci_itd_destruct %d\n", xname, itd->itd_num);

	fwohci_itd_dmabuf_free(itd);
}


/*
 * static int fwohci_itd_dmabuf_alloc(struct fwohci_it_dmabuf *itd)
 *
 *	This function allocates DMA memory for fwohci_it_dmabuf.  This
 *	function will return 0 when it succeeds and return non-zero
 *	value when it fails.
 */
static int
fwohci_itd_dmabuf_alloc(struct fwohci_it_dmabuf *itd)
{
	const char *xname = itd->itd_ctx->itc_sc->sc_sc1394.sc1394_dev.dv_xname;
	bus_dma_tag_t dmat = itd->itd_ctx->itc_sc->sc_dmat;

	int dmasize = itd->itd_maxsize * itd->itd_maxpacket;
	int error;

	DPRINTF(("%s: fwohci_itd_dmabuf_alloc[%d] dmasize %d maxpkt %d\n",
	    xname, itd->itd_num, dmasize, itd->itd_maxpacket));

	if ((error = bus_dmamem_alloc(dmat, dmasize, PAGE_SIZE, 0,
	    itd->itd_seg, FWOHCI_MAX_ITDATASEG, &itd->itd_nsegs, 0)) != 0) {
		printf("%s: unable to allocate data buffer, error = %d\n",
		    xname, error);
		goto fail_0;
	}

	/* checking memory range */
#ifdef FW_DEBUG
	{
		int loop;

		for (loop = 0; loop < itd->itd_nsegs; ++loop) {
			DPRINTF(("\t%.2d: 0x%lx - 0x%lx\n", loop,
			    (long)itd->itd_seg[loop].ds_addr,
			    (long)itd->itd_seg[loop].ds_addr
			    + (long)itd->itd_seg[loop].ds_len - 1));
		}
	}
#endif

	if ((error = bus_dmamem_map(dmat, itd->itd_seg, itd->itd_nsegs,
	    dmasize, (caddr_t *)&itd->itd_buf,
	    BUS_DMA_COHERENT | BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to map data buffer, error = %d\n",
		    xname, error);
		goto fail_1;
	}

	DPRINTF(("fwohci_it_data_alloc[%d]: bus_dmamem_map addr %p\n",
	    itd->itd_num, itd->itd_buf));

	if ((error = bus_dmamap_create(dmat, /*chunklen*/dmasize,
	    itd->itd_nsegs, dmasize, 0, BUS_DMA_WAITOK,
	    &itd->itd_dmamap)) != 0) {
		printf("%s: unable to create data buffer DMA map, "
		    "error = %d\n", xname, error);
		goto fail_2;
	}

	DPRINTF(("fwohci_it_data_alloc: bus_dmamem_create\n"));

	if ((error = bus_dmamap_load(dmat, itd->itd_dmamap,
	    itd->itd_buf, dmasize, NULL, BUS_DMA_WAITOK)) != 0) {
		printf("%s: unable to load data buffer DMA map, error = %d\n",
		    xname, error);
		goto fail_3;
	}

	DPRINTF(("fwohci_itd_dmabuf_alloc: load DMA memory vm %p\n",
	    itd->itd_buf));
	DPRINTF(("\tmapsize %ld nsegs %d\n",
	    (long)itd->itd_dmamap->dm_mapsize, itd->itd_dmamap->dm_nsegs));

#ifdef FW_DEBUG
	{
		int loop;

		for (loop = 0; loop < itd->itd_dmamap->dm_nsegs; ++loop) {
			DPRINTF(("\t%.2d: 0x%lx - 0x%lx\n", loop,
			    (long)itd->itd_dmamap->dm_segs[loop].ds_addr,
			    (long)itd->itd_dmamap->dm_segs[loop].ds_addr +
			    (long)itd->itd_dmamap->dm_segs[loop].ds_len - 1));
		}
	}
#endif

	return 0;

  fail_3:
	bus_dmamap_destroy(dmat, itd->itd_dmamap);
  fail_2:
	bus_dmamem_unmap(dmat, (caddr_t)itd->itd_buf, dmasize);
  fail_1:
	bus_dmamem_free(dmat, itd->itd_seg, itd->itd_nsegs);
  fail_0:
	itd->itd_nsegs = 0;
	itd->itd_maxpacket = 0;
	return error;
}

/*
 * static void fwohci_itd_dmabuf_free(struct fwohci_it_dmabuf *itd)
 *
 *	This function will release memory resource allocated by
 *	fwohci_itd_dmabuf_alloc().
 */
static void
fwohci_itd_dmabuf_free(struct fwohci_it_dmabuf *itd)
{
	bus_dma_tag_t dmat = itd->itd_ctx->itc_sc->sc_dmat;
	int dmasize = itd->itd_maxsize * itd->itd_maxpacket;

	bus_dmamap_destroy(dmat, itd->itd_dmamap);
	bus_dmamem_unmap(dmat, (caddr_t)itd->itd_buf, dmasize);
	bus_dmamem_free(dmat, itd->itd_seg, itd->itd_nsegs);

	itd->itd_nsegs = 0;
	itd->itd_maxpacket = 0;
}



/*
 * int fwohci_itd_link(struct fwohci_it_dmabuf *itd,
 *		struct fwohci_it_dmabuf *itdc)
 *
 *	This function will concatinate two descriptor chains in dmabuf
 *	itd and itdc.  The descriptor link in itdc follows one in itd.
 *	This function will move interrrupt packet from the end of itd
 *	to the top of itdc.
 *
 *	This function will return 0 whel this funcion suceeds.  If an
 *	error happens, return a negative value.
 */
int
fwohci_itd_link(struct fwohci_it_dmabuf *itd, struct fwohci_it_dmabuf *itdc)
{
	struct fwohci_desc *fd1, *fdc;

	if (itdc->itd_lastdesc == itdc->itd_desc) {
		/* no valid data */
		printf("fwohci_itd_link: no data\n");
		return -1;
	}

	if (itdc->itd_flags & ITD_FLAGS_LOCK) {
		/* used already */
		printf("fwohci_itd_link: link locked\n");
		return -1;
	}
	itdc->itd_flags |= ITD_FLAGS_LOCK;
	/* for the first one */
	itd->itd_flags |= ITD_FLAGS_LOCK;

	DPRINTF(("linking %d after %d: add %d pkts\n",
	    itdc->itd_num, itd->itd_num, itdc->itd_npacket));

	/* XXX: should sync cache */

	fd1 = itd->itd_lastdesc;
	fdc = itdc->itd_desc + 3; /* OUTPUT_LAST in the first descriptor */

	/* sanity check */
#define OUTPUT_LAST_DESC (OHCI_DESC_OUTPUT | OHCI_DESC_LAST | OHCI_DESC_BRANCH)
	if ((fd1->fd_flags & OUTPUT_LAST_DESC) != OUTPUT_LAST_DESC) {
		printf("funny! not OUTPUT_LAST descriptor %p\n", fd1);
	}
	if (itd->itd_lastdesc - itd->itd_desc != 3 * itd->itd_npacket) {
		printf("funny! packet number inconsistency %d <=> %d\n",
		    itd->itd_lastdesc - itd->itd_desc, 3*itd->itd_npacket);
	}

	fd1->fd_flags &= ~OHCI_DESC_INTR_ALWAYS;
	fdc->fd_flags |= OHCI_DESC_INTR_ALWAYS;
	fd1->fd_branch = itdc->itd_desc_phys | 4;

	itdc->itd_lastdesc->fd_flags |= OHCI_DESC_INTR_ALWAYS;
	/* save branch addr of lastdesc and substitute 0 to it */
	itdc->itd_savedbranch = itdc->itd_lastdesc->fd_branch;
	itdc->itd_lastdesc->fd_branch = 0;

	DPRINTF(("%s: link (%d %d), add pkt %d/%d branch 0x%x next saved 0x%x\n",
	    itd->itd_ctx->itc_sc->sc_sc1394.sc1394_dev.dv_xname,
	    itd->itd_num, itdc->itd_num,
	    itdc->itd_npacket, itdc->itd_maxpacket,
	    (int)fd1->fd_branch, (int)itdc->itd_savedbranch));

	/* XXX: should sync cache */

	return 0;
}


/*
 * int fwohci_itd_unlink(struct fwohci_it_dmabuf *itd)
 *
 *	This function will unlink the descriptor chain from valid link
 *	of descriptors.  The target descriptor is specified by the
 *	arguent.
 */
int
fwohci_itd_unlink(struct fwohci_it_dmabuf *itd)
{
	struct fwohci_desc *fd;

	/* XXX: should sync cache */

	fd = itd->itd_lastdesc;

	fd->fd_branch = itd->itd_savedbranch;
	DPRINTF(("%s: unlink buf %d branch restored 0x%x\n",
	    itd->itd_ctx->itc_sc->sc_sc1394.sc1394_dev.dv_xname,
	    itd->itd_num, (int)fd->fd_branch));

	fd->fd_flags &= ~OHCI_DESC_INTR_ALWAYS;
	itd->itd_lastdesc = itd->itd_desc;

	fd = itd->itd_desc + 3;	/* 1st OUTPUT_LAST */
	fd->fd_flags &= ~OHCI_DESC_INTR_ALWAYS;

	/* XXX: should sync cache */

	itd->itd_npacket = 0;
	itd->itd_lastdesc = itd->itd_desc;
	itd->itd_flags &= ~ITD_FLAGS_LOCK;

	return 0;
}


/*
 * static int fwohci_itd_writedata(struct fwohci_it_dmabuf *, int ndata,
 *			struct ieee1394_it_datalist *);
 *
 *	This function will return the number of written data, or
 *	negative value if an error happens
 */
int
fwohci_itd_writedata(struct fwohci_it_dmabuf *itd, int ndata,
    struct ieee1394_it_datalist *itdata)
{
	int writepkt;
	int i;
	u_int8_t *p;
	struct fwohci_desc *fd;
	u_int32_t *fd_idata;
	const int dspace =
	    itd->itd_maxpacket - itd->itd_npacket < ndata ?
	    itd->itd_maxpacket - itd->itd_npacket : ndata;

	if (itd->itd_flags & ITD_FLAGS_LOCK || dspace == 0) {
		/* it is locked: cannot write anything */
		if (itd->itd_flags & ITD_FLAGS_LOCK) {
			DPRINTF(("fwohci_itd_writedata: buf %d lock flag %s,"
			    " dspace %d\n",
			    itd->itd_num,
			    itd->itd_flags & ITD_FLAGS_LOCK ? "ON" : "OFF",
			    dspace));
			return 0;	/* not an error */
		}
	}

	/* sanity check */
	if (itd->itd_maxpacket < itd->itd_npacket) {
		printf("fwohci_itd_writedata: funny! # pkt > maxpkt"
			"%d %d\n", itd->itd_npacket, itd->itd_maxpacket);
	}

	p = itd->itd_buf + itd->itd_maxsize * itd->itd_npacket;
	fd = itd->itd_lastdesc;

	DPRINTF(("fwohci_itd_writedata(%d[%p], %d, 0x%p) invoked:\n",
	    itd->itd_num, itd, ndata, itdata));

	for (writepkt = 0; writepkt < dspace; ++writepkt) {
		u_int8_t *p1 = p;
		int cpysize;
		int totalsize = 0;

		DPRINTF(("writing %d ", writepkt));

		for (i = 0; i < 4; ++i) {
			switch (itdata->it_cmd[i]&IEEE1394_IT_CMD_MASK) {
			case IEEE1394_IT_CMD_IMMED:
				memcpy(p1, &itdata->it_u[i].id_data, 8);
				p1 += 8;
				totalsize += 8;
				break;
			case IEEE1394_IT_CMD_PTR:
				cpysize = itdata->it_cmd[i]&IEEE1394_IT_CMD_SIZE;
				DPRINTF(("fwohci_itd_writedata: cpy %d %p\n",
				    cpysize, itdata->it_u[i].id_addr));
				if (totalsize + cpysize > itd->itd_maxsize) {
					/* error: too big size */
					break;
				}
				memcpy(p1, itdata->it_u[i].id_addr, cpysize);
				totalsize += cpysize;
				break;
			case IEEE1394_IT_CMD_NOP:
				break;
			default:
				/* unknown command */
				break;
			}
		}

		/* only for DV test */
		if (totalsize != 488) {
			printf("error: totalsize %d at %d\n",
			    totalsize, writepkt);
		}

		DPRINTF(("totalsize %d ", totalsize));

		/* fill iso command in OUTPUT_IMMED descriptor */

		/* XXX: sync cache */
		fd += 2;	/* next to first descriptor */
		fd_idata = (u_int32_t *)fd;

		/*
		 * Umm, should tag, channel and tcode be written
		 * previously in itd_construct?
		 */
#if 0
		*fd_idata = OHCI_ITHEADER_VAL(TAG, tag) |
		    OHCI_ITHEADER_VAL(CHAN, ch) |
		    OHCI_ITHEADER_VAL(TCODE, IEEE1394_TCODE_STREAM_DATA);
#endif
		*++fd_idata = totalsize << 16;

		/* fill data in OUTPUT_LAST descriptor */
		++fd;
		/* intr check... */
		if (fd->fd_flags & OHCI_DESC_INTR_ALWAYS) {
			printf("uncleared INTR flag in desc %d\n",
			    (fd - itd->itd_desc - 1)/3);
		}
		fd->fd_flags &= ~OHCI_DESC_INTR_ALWAYS;

		if ((fd - itd->itd_desc - 1)/3 != itd->itd_maxpacket - 1) {
			u_int32_t bcal;

			bcal = (fd - itd->itd_desc + 1)*sizeof(struct fwohci_desc) + (u_int32_t)itd->itd_desc_phys;
			if (bcal != (fd->fd_branch & 0xfffffff0)) {

				printf("uum, branch differ at %d, %x %x %d/%d\n",
				    itd->itd_num,
				    bcal,
				    fd->fd_branch,
				    (fd - itd->itd_desc - 1)/3,
				    itd->itd_maxpacket);
			}
		} else {
			/* the last pcaket */
			if (fd->fd_branch != 0) {
				printf("uum, branch differ at %d, %x %x %d/%d\n",
				    itd->itd_num,
				    0,
				    fd->fd_branch,
				    (fd - itd->itd_desc - 1)/3,
				    itd->itd_maxpacket);
			}
		}

		/* sanity check */
		if (fd->fd_flags != OUTPUT_LAST_DESC) {
			printf("fwohci_itd_writedata: dmabuf %d desc inconsistent %d\n",
			    itd->itd_num, writepkt + itd->itd_npacket);
			break;
		}
		fd->fd_reqcount = totalsize;
		/* XXX: sync cache */

		++itdata;
		p += itd->itd_maxsize;
	}

	DPRINTF(("loop start %d, %d times %d\n",
	    itd->itd_npacket, dspace, writepkt));

	itd->itd_npacket += writepkt;
	itd->itd_lastdesc = fd;

	return writepkt;
}





int
fwohci_itd_isfilled(struct fwohci_it_dmabuf *itd)
{

	return itd->itd_npacket*2 > itd->itd_maxpacket ? 1 : 0;
}