* Copyright (c) 2003 Hidetoshi Shimokawa

/* $NetBSD: firewire.c,v 1.55 2022/05/22 11:27:35 andvar Exp $ */
/*-
* Copyright (c) 2003 Hidetoshi Shimokawa
* Copyright (c) 1998-2002 Katsushi Kobayashi and Hidetoshi Shimokawa
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the acknowledgement as bellow:
*
* This product includes software developed by K. Kobayashi and H. Shimokawa
*
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD: src/sys/dev/firewire/firewire.c,v 1.110 2009/04/07 02:33:46 sbruno Exp $
*
*/

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

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

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

#include "locators.h"

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

int firewire_debug = 0, try_bmr = 1, hold_count = 0;
/*
* Setup sysctl(3) MIB, hw.ieee1394if.*
*
* TBD condition CTLFLAG_PERMANENT on being a module or not
*/
SYSCTL_SETUP(sysctl_ieee1394if, "sysctl ieee1394if(4) subtree setup")
{
int rc, ieee1394if_node_num;
const struct sysctlnode *node;

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

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

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

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

return;

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

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

#define FW_MAXASYRTY 4

#define FW_GENERATION_CHANGEABLE 2

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

int firewire_resume (struct firewire_comm *);

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

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

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

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

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

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

return 1; /* always match */
}

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

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

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

fc->status = FWBUSNOTREADY;

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

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

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

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

callout_schedule(&fc->timeout_callout, hz);

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

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

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

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

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

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

return;
}

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

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

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

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

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

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

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

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

return UNCONF;
}

int
firewire_resume(struct firewire_comm *fc)
{

fc->status = FWBUSNOTREADY;
return 0;
}

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

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

return fwdev;
}

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

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

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

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

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

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

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

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

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

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

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

fw_asystart(xfer);
return 0;
}

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

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

return;
}

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

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

return err;
}

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

STAILQ_INIT(&xfer_drain);

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

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

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

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

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

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

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

fw_reset_crom(fc);

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

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

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

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

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

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

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

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

CSRARC(fc, TOPO_MAP) = 0x3f1 << 16;
CSRARC(fc, TOPO_MAP + 4) = 1;
CSRARC(fc, SPED_MAP) = 0x3f1 << 16;
CSRARC(fc, SPED_MAP + 4) = 1;

STAILQ_INIT(&fc->devices);

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

/* DV depend CSRs see blue book */
#if 0
CSRARC(fc, oMPR) = 0x3fff0001; /* # output channel = 1 */
CSRARC(fc, oPCR) = 0x8000007a;
for (i = 4; i < 0x7c/4; i+=4)
CSRARC(fc, i + oPCR) = 0x8000007a;

CSRARC(fc, iMPR) = 0x00ff0001; /* # input channel = 1 */
CSRARC(fc, iPCR) = 0x803f0000;
for (i = 4; i < 0x7c/4; i+=4)
CSRARC(fc, i + iPCR) = 0x0;
#endif

fc->crom_src_buf = NULL;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

mutex_exit(&fc->fc_mtx);
aprint_error_dev(fc->bdev, "no such binding\n");
return 1;
found:
#if 0
/* shall we do this? */
for (xfer = STAILQ_FIRST(&fwb->xferlist); xfer != NULL; xfer = next) {
next = STAILQ_NEXT(xfer, link);
fw_xfer_free(xfer);
}
STAILQ_INIT(&fwb->xferlist);
#endif

return 0;
}

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

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

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

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

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

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

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

return xfer;
}

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

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

/*
* IEEE1394 XFER post process.
*/
void
fw_xfer_done(struct fw_xfer *xfer)
{

if (xfer->hand == NULL) {
aprint_error_dev(xfer->fc->bdev, "hand == NULL\n");
return;
}

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

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

void
fw_xfer_unload(struct fw_xfer* xfer)
{

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

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

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

void
fw_xfer_free_buf(struct fw_xfer* xfer)
{

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

void
fw_asy_callback_free(struct fw_xfer *xfer)
{

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

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

fc->sid_cnt = len / (sizeof(uint32_t) * 2);
fc->max_node = fc->nodeid & 0x3f;
CSRARC(fc, NODE_IDS) = ((uint32_t)fc->nodeid) << 16;
fc->status = FWBUSCYMELECT;
fc->topology_map->crc_len = 2;
fc->topology_map->generation++;
fc->topology_map->self_id_count = 0;
fc->topology_map->node_count = 0;
fc->speed_map->generation++;
fc->speed_map->crc_len = 1 + (64*64 + 3) / 4;
self_id = fc->topology_map->self_id;
for (i = 0; i < fc->sid_cnt; i++) {
if (sid[1] != ~sid[0]) {
aprint_error_dev(fc->bdev,
"ERROR invalid self-id packet\n");
sid += 2;
continue;
}
*self_id = *((union fw_self_id *)sid);
fc->topology_map->crc_len++;
if (self_id->p0.sequel == 0) {
fc->topology_map->node_count++;
c_port = 0;
if (firewire_debug)
fw_print_sid(sid[0]);
node = self_id->p0.phy_id;
if (fc->max_node < node)
fc->max_node = self_id->p0.phy_id;
/* XXX I'm not sure this is the right speed_map */
fc->speed_map->speed[node][node] =
self_id->p0.phy_speed;
for (j = 0; j < node; j++)
fc->speed_map->speed[j][node] =
fc->speed_map->speed[node][j] =
uimin(fc->speed_map->speed[j][j],
self_id->p0.phy_speed);
if ((fc->irm == -1 || self_id->p0.phy_id > fc->irm) &&
(self_id->p0.link_active && self_id->p0.contender))
fc->irm = self_id->p0.phy_id;
if (self_id->p0.port0 >= 0x2)
c_port++;
if (self_id->p0.port1 >= 0x2)
c_port++;
if (self_id->p0.port2 >= 0x2)
c_port++;
}
if (c_port > 2)
i_branch += (c_port - 2);
sid += 2;
self_id++;
fc->topology_map->self_id_count++;
}
/* CRC */
fc->topology_map->crc =
fw_crc16((uint32_t *)&fc->topology_map->generation,
fc->topology_map->crc_len * 4);
fc->speed_map->crc = fw_crc16((uint32_t *)&fc->speed_map->generation,
fc->speed_map->crc_len * 4);
/* byteswap and copy to CSR */
p = (uint32_t *)fc->topology_map;
for (i = 0; i <= fc->topology_map->crc_len; i++)
CSRARC(fc, TOPO_MAP + i * 4) = htonl(*p++);
p = (uint32_t *)fc->speed_map;
CSRARC(fc, SPED_MAP) = htonl(*p++);
CSRARC(fc, SPED_MAP + 4) = htonl(*p++);
/* don't byte-swap uint8_t array */
memcpy(&CSRARC(fc, SPED_MAP + 8), p, (fc->speed_map->crc_len - 1) * 4);

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

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

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

/*
* Generic packet receiving process.
*/
void
fw_rcv(struct fw_rcv_buf *rb)
{
struct fw_pkt *fp, *resfp;
struct fw_bind *bind;
int tcode;
int i, len, oldstate;
#if 0
{
uint32_t *qld;
int i;
qld = (uint32_t *)buf;
printf("spd %d len:%d\n", spd, len);
for (i = 0; i <= len && i < 32; i+= 4) {
printf("0x%08x ", ntohl(qld[i/4]));
if ((i % 16) == 15) printf("\n");
}
if ((i % 16) != 15) printf("\n");
}
#endif
fp = (struct fw_pkt *)rb->vec[0].iov_base;
tcode = fp->mode.common.tcode;
switch (tcode) {
case FWTCODE_WRES:
case FWTCODE_RRESQ:
case FWTCODE_RRESB:
case FWTCODE_LRES:
rb->xfer = fw_tl2xfer(rb->fc, fp->mode.hdr.src,
fp->mode.hdr.tlrt >> 2, tcode);
if (rb->xfer == NULL) {
aprint_error_dev(rb->fc->bdev, "unknown response"
" %s(%x) src=0x%x tl=0x%x rt=%d data=0x%x\n",
tcode_str[tcode], tcode,
fp->mode.hdr.src,
fp->mode.hdr.tlrt >> 2,
fp->mode.hdr.tlrt & 3,
fp->mode.rresq.data);
#if 0
printf("try ad-hoc work around!!\n");
rb->xfer = fw_tl2xfer(rb->fc, fp->mode.hdr.src,
(fp->mode.hdr.tlrt >> 2) ^ 3);
if (rb->xfer == NULL) {
printf("no use...\n");
return;
}
#else
return;
#endif
}
fw_rcv_copy(rb);
if (rb->xfer->recv.hdr.mode.wres.rtcode != RESP_CMP)
rb->xfer->resp = EIO;
else
rb->xfer->resp = 0;
/* make sure the packet is drained in AT queue */
oldstate = rb->xfer->flag;
rb->xfer->flag = FWXF_RCVD;
switch (oldstate) {
case FWXF_SENT:
fw_xfer_done(rb->xfer);
break;
case FWXF_START:
#if 0
if (firewire_debug)
printf("not sent yet tl=%x\n", rb->xfer->tl);
#endif
break;
default:
aprint_error_dev(rb->fc->bdev,
"unexpected flag 0x%02x\n", rb->xfer->flag);
}
return;
case FWTCODE_WREQQ:
case FWTCODE_WREQB:
case FWTCODE_RREQQ:
case FWTCODE_RREQB:
case FWTCODE_LREQ:
bind = fw_bindlookup(rb->fc, fp->mode.rreqq.dest_hi,
fp->mode.rreqq.dest_lo);
if (bind == NULL) {
#if 1
aprint_error_dev(rb->fc->bdev, "Unknown service addr"
" 0x%04x:0x%08x %s(%x) src=0x%x data=%x\n",
fp->mode.wreqq.dest_hi, fp->mode.wreqq.dest_lo,
tcode_str[tcode], tcode,
fp->mode.hdr.src, ntohl(fp->mode.wreqq.data));
#endif
if (rb->fc->status == FWBUSINIT) {
aprint_error_dev(rb->fc->bdev,
"cannot respond(bus reset)!\n");
return;
}
rb->xfer = fw_xfer_alloc(M_FW);
if (rb->xfer == NULL)
return;
rb->xfer->send.spd = rb->spd;
rb->xfer->send.pay_len = 0;
resfp = &rb->xfer->send.hdr;
switch (tcode) {
case FWTCODE_WREQQ:
case FWTCODE_WREQB:
resfp->mode.hdr.tcode = FWTCODE_WRES;
break;
case FWTCODE_RREQQ:
resfp->mode.hdr.tcode = FWTCODE_RRESQ;
break;
case FWTCODE_RREQB:
resfp->mode.hdr.tcode = FWTCODE_RRESB;
break;
case FWTCODE_LREQ:
resfp->mode.hdr.tcode = FWTCODE_LRES;
break;
}
resfp->mode.hdr.dst = fp->mode.hdr.src;
resfp->mode.hdr.tlrt = fp->mode.hdr.tlrt;
resfp->mode.hdr.pri = fp->mode.hdr.pri;
resfp->mode.rresb.rtcode = RESP_ADDRESS_ERROR;
resfp->mode.rresb.extcode = 0;
resfp->mode.rresb.len = 0;
/*
rb->xfer->hand = fw_xferwake;
*/
rb->xfer->hand = fw_xfer_free;
if (fw_asyreq(rb->fc, -1, rb->xfer)) {
fw_xfer_free(rb->xfer);
return;
}
return;
}
len = 0;
for (i = 0; i < rb->nvec; i++)
len += rb->vec[i].iov_len;
mutex_enter(&bind->fwb_mtx);
rb->xfer = STAILQ_FIRST(&bind->xferlist);
if (rb->xfer == NULL) {
mutex_exit(&bind->fwb_mtx);
#if 1
aprint_error_dev(rb->fc->bdev,
"Discard a packet for this bind.\n");
#endif
return;
}
STAILQ_REMOVE_HEAD(&bind->xferlist, link);
mutex_exit(&bind->fwb_mtx);
fw_rcv_copy(rb);
rb->xfer->hand(rb->xfer);
return;

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

/*
* CRC16 check-sum for IEEE1394 register blocks.
*/
uint16_t
fw_crc16(uint32_t *ptr, uint32_t len)
{
uint32_t i, sum, crc = 0;
int shift;

len = (len + 3) & ~3;
for (i = 0; i < len; i+= 4) {
for (shift = 28; shift >= 0; shift -= 4) {
sum = ((crc >> 12) ^ (ptr[i/4] >> shift)) & 0xf;
crc = (crc << 4) ^ (sum << 12) ^ (sum << 5) ^ sum;
}
crc &= 0xffff;
}
return (uint16_t)crc;
}

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

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

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

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

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

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

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

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

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

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

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

fc = (struct firewire_comm *)arg;

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

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

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

while ((xfer = STAILQ_FIRST(&xferq->q)) != NULL) {
STAILQ_REMOVE_HEAD(&xferq->q, link);
#if 0
xferq->queued--;
#endif
xfer->resp = EAGAIN;
xfer->flag = FWXF_SENTERR;
fw_xfer_done(xfer);
}
}

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

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

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

fc->max_node = -1;

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

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

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

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

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

src = &fc->crom_src_buf->src;
memset(src, 0, sizeof(struct crom_src));

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

src->businfo.bus_name = CSR_BUS_NAME_IEEE1394;

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

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

STAILQ_INIT(&src->chunk_list);

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

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

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

STAILQ_INIT(&src->chunk_list);

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

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

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

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

if (xfer->tl < 0)
return;

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

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

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

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

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

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

fc->status = FWBUSPHYCONF;

xfer = fw_xfer_alloc(M_FW);
if (xfer == NULL)
return;
xfer->fc = fc;
xfer->hand = fw_asy_callback_free;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* XXX check CRC */

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

if (recur == 0)
return 0;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

/* NOTREACHED */
}

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

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

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

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

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

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

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

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

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

/* FALLTHROUGH */

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

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

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

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

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

if (devlist == NULL)
continue;

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

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

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

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

return;
}

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

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

if (firewire_debug > 1)
printf("fw_get_tlabel: no free tlabel\n");
return -1;
}

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

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

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

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

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

/* special handling for RRESQ */
if (pkt->mode.hdr.tcode == FWTCODE_RRESQ &&
p != NULL && res >= sizeof(uint32_t)) {
*(uint32_t *)p = pkt->mode.rresq.data;
rb->xfer->recv.pay_len = sizeof(uint32_t);
return;
}

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

plen = pkt->mode.rresb.len;

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

}

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

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

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

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

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

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

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

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

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

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

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

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

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

return 0;
}