* Copyright (c) 1990 The Regents of the University of California.

/* $NetBSD: siop.c,v 1.71 2022/04/07 19:33:37 andvar Exp $ */

/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Van Jacobson of Lawrence Berkeley Laboratory.
*
* 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. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*
* @(#)siop.c 7.5 (Berkeley) 5/4/91
*/

/*
* Copyright (c) 1994 Michael L. Hitch
*
* This code is derived from software contributed to Berkeley by
* Van Jacobson of Lawrence Berkeley Laboratory.
*
* 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.
*
* 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.
*
* @(#)siop.c 7.5 (Berkeley) 5/4/91
*/

/*
* AMIGA 53C710 scsi adaptor driver
*/

#include "opt_ddb.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: siop.c,v 1.71 2022/04/07 19:33:37 andvar Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/buf.h>
#include <sys/malloc.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>
#include <machine/cpu.h>
#ifdef __m68k__
#include <m68k/cacheops.h>
#else
#define DCIAS(pa)
#endif
#include <amiga/amiga/custom.h>
#include <amiga/amiga/isr.h>
#include <amiga/dev/siopreg.h>
#include <amiga/dev/siopvar.h>

/*
* SCSI delays
* In u-seconds, primarily for state changes on the SPC.
*/
#define SCSI_CMD_WAIT 500000 /* wait per step of 'immediate' cmds */
#define SCSI_DATA_WAIT 500000 /* wait per data in/out step */
#define SCSI_INIT_WAIT 500000 /* wait per step (both) during init */

void siop_select(struct siop_softc *);
void siopabort(struct siop_softc *, siop_regmap_p, const char *);
void sioperror(struct siop_softc *, siop_regmap_p, u_char);
void siopstart(struct siop_softc *);
int siop_checkintr(struct siop_softc *, u_char, u_char, u_char, int *);
void siopreset(struct siop_softc *);
void siopsetdelay(int);
void siop_scsidone(struct siop_acb *, int);
void siop_timeout(void *);
void siop_sched(struct siop_softc *);
void siop_poll(struct siop_softc *, struct siop_acb *);
void siopintr(struct siop_softc *);
void scsi_period_to_siop(struct siop_softc *, int);
void siop_start(struct siop_softc *, int, int, u_char *, int, u_char *, int);
void siop_dump_acb(struct siop_acb *);

/* 53C710 script */
const
#include <amiga/dev/siop_script.out>

/* default to not inhibit sync negotiation on any drive */
u_char siop_inhibit_sync[8] = { 0, 0, 0, 0, 0, 0, 0 }; /* initialize, so patchable */
u_char siop_allow_disc[8] = {3, 3, 3, 3, 3, 3, 3, 3};
int siop_no_dma = 0;

int siop_reset_delay = 250; /* delay after reset, in milleseconds */

int siop_cmd_wait = SCSI_CMD_WAIT;
int siop_data_wait = SCSI_DATA_WAIT;
int siop_init_wait = SCSI_INIT_WAIT;

#ifdef DEBUG_SYNC
/*
* sync period transfer lookup - only valid for 66 MHz clock
*/
static struct {
unsigned char p; /* period from sync request message */
unsigned char r; /* siop_period << 4 | sbcl */
} sync_tab[] = {
{ 60/4, 0<<4 | 1},
{ 76/4, 1<<4 | 1},
{ 92/4, 2<<4 | 1},
{ 92/4, 0<<4 | 2},
{108/4, 3<<4 | 1},
{116/4, 1<<4 | 2},
{120/4, 4<<4 | 1},
{120/4, 0<<4 | 3},
{136/4, 5<<4 | 1},
{140/4, 2<<4 | 2},
{152/4, 6<<4 | 1},
{152/4, 1<<4 | 3},
{164/4, 3<<4 | 2},
{168/4, 7<<4 | 1},
{180/4, 2<<4 | 3},
{184/4, 4<<4 | 2},
{208/4, 5<<4 | 2},
{212/4, 3<<4 | 3},
{232/4, 6<<4 | 2},
{240/4, 4<<4 | 3},
{256/4, 7<<4 | 2},
{272/4, 5<<4 | 3},
{300/4, 6<<4 | 3},
{332/4, 7<<4 | 3}
};
#endif

#ifdef DEBUG
/*
* 0x01 - full debug
* 0x02 - DMA chaining
* 0x04 - siopintr
* 0x08 - phase mismatch
* 0x10 - <not used>
* 0x20 - panic on unhandled exceptions
* 0x100 - disconnect/reselect
*/
int siop_debug = 0;
int siopsync_debug = 0;
int siopdma_hits = 0;
int siopdma_misses = 0;
int siopchain_ints = 0;
int siopstarts = 0;
int siopints = 0;
int siopphmm = 0;
#define SIOP_TRACE_SIZE 128
#define SIOP_TRACE(a,b,c,d) \
siop_trbuf[siop_trix] = (a); \
siop_trbuf[siop_trix+1] = (b); \
siop_trbuf[siop_trix+2] = (c); \
siop_trbuf[siop_trix+3] = (d); \
siop_trix = (siop_trix + 4) & (SIOP_TRACE_SIZE - 1);
u_char siop_trbuf[SIOP_TRACE_SIZE];
int siop_trix;
void siop_dump(struct siop_softc *);
void siop_dump_trace(void);
#else
#define SIOP_TRACE(a,b,c,d)
#endif

/*
* default minphys routine for siop based controllers
*/
void
siop_minphys(struct buf *bp)
{

/*
* No max transfer at this level.
*/
minphys(bp);
}

/*
* used by specific siop controller
*
*/
void
siop_scsipi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req,
void *arg)
{
struct scsipi_xfer *xs;
#ifdef DIAGNOSTIC
struct scsipi_periph *periph;
#endif
struct siop_acb *acb;
struct siop_softc *sc = device_private(chan->chan_adapter->adapt_dev);
int flags, s;

switch (req) {
case ADAPTER_REQ_RUN_XFER:
xs = arg;
#ifdef DIAGNOSTIC
periph = xs->xs_periph;
#endif
flags = xs->xs_control;

/* XXXX ?? */
if (flags & XS_CTL_DATA_UIO)
panic("siop: scsi data uio requested");

/* XXXX ?? */
if (sc->sc_nexus && flags & XS_CTL_POLL)
/* panic("siop_scsicmd: busy");*/
printf("siop_scsicmd: busy\n");

s = splbio();
acb = sc->free_list.tqh_first;
if (acb) {
TAILQ_REMOVE(&sc->free_list, acb, chain);
}
splx(s);

#ifdef DIAGNOSTIC
/*
* This should never happen as we track the resources
* in the mid-layer.
*/
if (acb == NULL) {
scsipi_printaddr(periph);
printf("unable to allocate acb\n");
panic("siop_scsipi_request");
}
#endif

acb->flags = ACB_ACTIVE;
acb->xs = xs;
memcpy(&acb->cmd, xs->cmd, xs->cmdlen);
acb->clen = xs->cmdlen;
acb->daddr = xs->data;
acb->dleft = xs->datalen;

s = splbio();
TAILQ_INSERT_TAIL(&sc->ready_list, acb, chain);

if (sc->sc_nexus == NULL)
siop_sched(sc);

splx(s);

if (flags & XS_CTL_POLL || siop_no_dma)
siop_poll(sc, acb);
return;

case ADAPTER_REQ_GROW_RESOURCES:
return;

case ADAPTER_REQ_SET_XFER_MODE:
return;
}
}

void
siop_poll(struct siop_softc *sc, struct siop_acb *acb)
{
siop_regmap_p rp = sc->sc_siopp;
struct scsipi_xfer *xs = acb->xs;
int i;
int status;
u_char istat;
u_char dstat;
u_char sstat0;
int s;
int to;

s = splbio();
to = xs->timeout / 1000;
if (sc->nexus_list.tqh_first)
printf("%s: siop_poll called with disconnected device\n",
device_xname(sc->sc_dev));
for (;;) {
/* use cmd_wait values? */
i = 50000;
/* XXX spl0(); */
while (((istat = rp->siop_istat) &
(SIOP_ISTAT_SIP | SIOP_ISTAT_DIP)) == 0) {
if (--i <= 0) {
#ifdef DEBUG
printf ("waiting: tgt %d cmd %02x sbcl %02x dsp %lx (+%lx) dcmd %lx ds %p timeout %d\n",
xs->xs_periph->periph_target, acb->cmd.opcode,
rp->siop_sbcl, rp->siop_dsp,
rp->siop_dsp - sc->sc_scriptspa,
*((volatile long *)&rp->siop_dcmd), &acb->ds, acb->xs->timeout);
#endif
i = 50000;
--to;
if (to <= 0) {
siopreset(sc);
return;
}
}
delay(20);
}
sstat0 = rp->siop_sstat0;
dstat = rp->siop_dstat;
if (siop_checkintr(sc, istat, dstat, sstat0, &status)) {
if (acb != sc->sc_nexus)
printf("%s: siop_poll disconnected device completed\n",
device_xname(sc->sc_dev));
else if ((sc->sc_flags & SIOP_INTDEFER) == 0) {
sc->sc_flags &= ~SIOP_INTSOFF;
rp->siop_sien = sc->sc_sien;
rp->siop_dien = sc->sc_dien;
}
siop_scsidone(sc->sc_nexus, status);
}

if (xs->xs_status & XS_STS_DONE)
break;
}
splx(s);
}

/*
* start next command that's ready
*/
void
siop_sched(struct siop_softc *sc)
{
struct scsipi_periph *periph;
struct siop_acb *acb;
int i;

#ifdef DEBUG
if (sc->sc_nexus) {
printf("%s: siop_sched- nexus %p/%d ready %p/%d\n",
device_xname(sc->sc_dev), sc->sc_nexus,
sc->sc_nexus->xs->xs_periph->periph_target,
sc->ready_list.tqh_first,
sc->ready_list.tqh_first->xs->xs_periph->periph_target);
return;
}
#endif
for (acb = sc->ready_list.tqh_first; acb; acb = acb->chain.tqe_next) {
periph = acb->xs->xs_periph;
i = periph->periph_target;
if(!(sc->sc_tinfo[i].lubusy & (1 << periph->periph_lun))) {
struct siop_tinfo *ti = &sc->sc_tinfo[i];

TAILQ_REMOVE(&sc->ready_list, acb, chain);
sc->sc_nexus = acb;
periph = acb->xs->xs_periph;
ti = &sc->sc_tinfo[periph->periph_target];
ti->lubusy |= (1 << periph->periph_lun);
break;
}
}

if (acb == NULL) {
#ifdef DEBUGXXX
printf("%s: siop_sched didn't find ready command\n",
device_xname(sc->sc_dev));
#endif
return;
}

if (acb->xs->xs_control & XS_CTL_RESET)
siopreset(sc);

#if 0
acb->cmd.bytes[0] |= slp->scsipi_scsi.lun << 5; /* XXXX */
#endif
++sc->sc_active;
siop_select(sc);
}

void
siop_scsidone(struct siop_acb *acb, int stat)
{
struct scsipi_xfer *xs;
struct scsipi_periph *periph;
struct siop_softc *sc;
int dosched = 0;

if (acb == NULL || (xs = acb->xs) == NULL) {
#ifdef DIAGNOSTIC
printf("siop_scsidone: NULL acb or scsipi_xfer\n");
#if defined(DEBUG) && defined(DDB)
Debugger();
#endif
#endif
return;
}

callout_stop(&xs->xs_callout);

periph = xs->xs_periph;
sc = device_private(periph->periph_channel->chan_adapter->adapt_dev);

xs->status = stat;
xs->resid = 0; /* XXXX */

if (xs->error == XS_NOERROR) {
if (stat == SCSI_CHECK || stat == SCSI_BUSY)
xs->error = XS_BUSY;
}

/*
* Remove the ACB from whatever queue it's on. We have to do a bit of
* a hack to figure out which queue it's on. Note that it is *not*
* necessary to cdr down the ready queue, but we must cdr down the
* nexus queue and see if it's there, so we can mark the unit as no
* longer busy. This code is sickening, but it works.
*/
if (acb == sc->sc_nexus) {
sc->sc_nexus = NULL;
sc->sc_tinfo[periph->periph_target].lubusy &=
~(1<<periph->periph_lun);
if (sc->ready_list.tqh_first)
dosched = 1; /* start next command */
--sc->sc_active;
SIOP_TRACE('d','a',stat,0)
} else if (sc->ready_list.tqh_last == &acb->chain.tqe_next) {
TAILQ_REMOVE(&sc->ready_list, acb, chain);
SIOP_TRACE('d','r',stat,0)
} else {
register struct siop_acb *acb2;
for (acb2 = sc->nexus_list.tqh_first; acb2;
acb2 = acb2->chain.tqe_next)
if (acb2 == acb) {
TAILQ_REMOVE(&sc->nexus_list, acb, chain);
sc->sc_tinfo[periph->periph_target].lubusy
&= ~(1<<periph->periph_lun);
--sc->sc_active;
break;
}
if (acb2)
;
else if (acb->chain.tqe_next) {
TAILQ_REMOVE(&sc->ready_list, acb, chain);
--sc->sc_active;
} else {
printf("%s: can't find matching acb\n",
device_xname(sc->sc_dev));
#ifdef DDB
/* Debugger(); */
#endif
}
SIOP_TRACE('d','n',stat,0);
}
/* Put it on the free list. */
acb->flags = ACB_FREE;
TAILQ_INSERT_HEAD(&sc->free_list, acb, chain);

sc->sc_tinfo[periph->periph_target].cmds++;

scsipi_done(xs);

if (dosched && sc->sc_nexus == NULL)
siop_sched(sc);
}

void
siopabort(register struct siop_softc *sc, siop_regmap_p rp, const char *where)
{
#ifdef fix_this
int i;
#endif

printf ("%s: abort %s: dstat %02x, sstat0 %02x sbcl %02x\n",
device_xname(sc->sc_dev),
where, rp->siop_dstat, rp->siop_sstat0, rp->siop_sbcl);

if (sc->sc_active > 0) {
#ifdef TODO
SET_SBIC_cmd (rp, SBIC_CMD_ABORT);
WAIT_CIP (rp);

GET_SBIC_asr (rp, asr);
if (asr & (SBIC_ASR_BSY|SBIC_ASR_LCI))
{
/* ok, get more drastic.. */

SET_SBIC_cmd (rp, SBIC_CMD_RESET);
delay(25);
SBIC_WAIT(rp, SBIC_ASR_INT, 0);
GET_SBIC_csr (rp, csr); /* clears interrupt also */

return;
}

do
{
SBIC_WAIT (rp, SBIC_ASR_INT, 0);
GET_SBIC_csr (rp, csr);
}
while ((csr != SBIC_CSR_DISC) && (csr != SBIC_CSR_DISC_1)
&& (csr != SBIC_CSR_CMD_INVALID));
#endif

/* lets just hope it worked.. */
#ifdef fix_this
for (i = 0; i < 2; ++i) {
if (sc->sc_iob[i].sc_xs && &sc->sc_iob[i] !=
sc->sc_cur) {
printf ("siopabort: cleanup!\n");
sc->sc_iob[i].sc_xs = NULL;
}
}
#endif /* fix_this */
/* sc->sc_active = 0; */
}
}

void
siopinitialize(struct siop_softc *sc)
{
int i;
u_int inhibit_sync;
extern u_long scsi_nosync;
extern int shift_nosync;

/*
* Need to check that scripts is on a long word boundary
* Also should verify that dev doesn't span non-contiguous
* physical pages.
*/
sc->sc_scriptspa = kvtop((void *)__UNCONST(scripts));

/*
* malloc sc_acb to ensure that DS is on a long word boundary.
*/

sc->sc_acb = malloc(sizeof(struct siop_acb) * SIOP_NACB,
M_DEVBUF, M_WAITOK);

sc->sc_tcp[1] = 1000 / sc->sc_clock_freq;
sc->sc_tcp[2] = 1500 / sc->sc_clock_freq;
sc->sc_tcp[3] = 2000 / sc->sc_clock_freq;
sc->sc_minsync = sc->sc_tcp[1]; /* in 4ns units */
if (sc->sc_minsync < 25)
sc->sc_minsync = 25;
if (sc->sc_clock_freq <= 25) {
sc->sc_dcntl |= 0x80; /* SCLK/1 */
sc->sc_tcp[0] = sc->sc_tcp[1];
} else if (sc->sc_clock_freq <= 37) {
sc->sc_dcntl |= 0x40; /* SCLK/1.5 */
sc->sc_tcp[0] = sc->sc_tcp[2];
} else if (sc->sc_clock_freq <= 50) {
sc->sc_dcntl |= 0x00; /* SCLK/2 */
sc->sc_tcp[0] = sc->sc_tcp[3];
} else {
sc->sc_dcntl |= 0xc0; /* SCLK/3 */
sc->sc_tcp[0] = 3000 / sc->sc_clock_freq;
}

if (scsi_nosync) {
inhibit_sync = (scsi_nosync >> shift_nosync) & 0xff;
shift_nosync += 8;
#ifdef DEBUG
if (inhibit_sync)
printf("%s: Inhibiting synchronous transfer %02x\n",
device_xname(sc->sc_dev), inhibit_sync);
#endif
for (i = 0; i < 8; ++i)
if (inhibit_sync & (1 << i))
siop_inhibit_sync[i] = 1;
}

siopreset (sc);
}

void
siop_timeout(void *arg)
{
struct siop_acb *acb;
struct scsipi_periph *periph;
struct siop_softc *sc;
int s;

acb = arg;
periph = acb->xs->xs_periph;
sc = device_private(periph->periph_channel->chan_adapter->adapt_dev);
scsipi_printaddr(periph);
printf("timed out\n");

s = splbio();

acb->xs->error = XS_TIMEOUT;
siopreset(sc);

splx(s);
}

void
siopreset(struct siop_softc *sc)
{
siop_regmap_p rp;
u_int i, s;
u_char dummy;
struct siop_acb *acb;

rp = sc->sc_siopp;

if (sc->sc_flags & SIOP_ALIVE)
siopabort(sc, rp, "reset");

printf("%s: ", device_xname(sc->sc_dev)); /* XXXX */

s = splbio();

/*
* Reset the chip
* XXX - is this really needed?
*/
rp->siop_istat |= SIOP_ISTAT_ABRT; /* abort current script */
rp->siop_istat |= SIOP_ISTAT_RST; /* reset chip */
rp->siop_istat &= ~SIOP_ISTAT_RST;
/*
* Reset SCSI bus (do we really want this?)
*/
rp->siop_sien = 0;
rp->siop_scntl1 |= SIOP_SCNTL1_RST;
delay(1);
rp->siop_scntl1 &= ~SIOP_SCNTL1_RST;

/*
* Set up various chip parameters
*/
rp->siop_scntl0 = SIOP_ARB_FULL | SIOP_SCNTL0_EPC | SIOP_SCNTL0_EPG;
rp->siop_scntl1 = SIOP_SCNTL1_ESR;
rp->siop_dcntl = sc->sc_dcntl;
rp->siop_dmode = 0x80; /* burst length = 4 */
rp->siop_sien = 0x00; /* don't enable interrupts yet */
rp->siop_dien = 0x00; /* don't enable interrupts yet */
rp->siop_scid = 1 << sc->sc_channel.chan_id;
rp->siop_dwt = 0x00;
rp->siop_ctest0 |= SIOP_CTEST0_BTD | SIOP_CTEST0_EAN;
rp->siop_ctest7 |= sc->sc_ctest7;

/* will need to re-negotiate sync xfers */
memset(&sc->sc_sync, 0, sizeof (sc->sc_sync));

i = rp->siop_istat;
if (i & SIOP_ISTAT_SIP)
dummy = rp->siop_sstat0;
if (i & SIOP_ISTAT_DIP)
dummy = rp->siop_dstat;

__USE(dummy);
splx (s);

delay (siop_reset_delay * 1000);
printf("siop id %d reset V%d\n", sc->sc_channel.chan_id,
rp->siop_ctest8 >> 4);

if ((sc->sc_flags & SIOP_ALIVE) == 0) {
TAILQ_INIT(&sc->ready_list);
TAILQ_INIT(&sc->nexus_list);
TAILQ_INIT(&sc->free_list);
sc->sc_nexus = NULL;
acb = sc->sc_acb;
memset(acb, 0, sizeof(struct siop_acb) * SIOP_NACB);
for (i = 0; i < SIOP_NACB; i++) {
TAILQ_INSERT_TAIL(&sc->free_list, acb, chain);
acb++;
}
memset(sc->sc_tinfo, 0, sizeof(sc->sc_tinfo));
} else {
if (sc->sc_nexus != NULL) {
sc->sc_nexus->xs->error = XS_RESET;
siop_scsidone(sc->sc_nexus, sc->sc_nexus->stat[0]);
}
while ((acb = sc->nexus_list.tqh_first) > 0) {
acb->xs->error = XS_RESET;
siop_scsidone(acb, acb->stat[0]);
}
}

sc->sc_flags |= SIOP_ALIVE;
sc->sc_flags &= ~(SIOP_INTDEFER|SIOP_INTSOFF);
/* enable SCSI and DMA interrupts */
sc->sc_sien = SIOP_SIEN_M_A | SIOP_SIEN_STO | /*SIOP_SIEN_SEL |*/ SIOP_SIEN_SGE |
SIOP_SIEN_UDC | SIOP_SIEN_RST | SIOP_SIEN_PAR;
sc->sc_dien = SIOP_DIEN_BF | SIOP_DIEN_ABRT | SIOP_DIEN_SIR |
/*SIOP_DIEN_WTD |*/ SIOP_DIEN_IID;
rp->siop_sien = sc->sc_sien;
rp->siop_dien = sc->sc_dien;
}

/*
* Setup Data Storage for 53C710 and start SCRIPTS processing
*/

void
siop_start(struct siop_softc *sc, int target, int lun, u_char *cbuf, int clen,
u_char *buf, int len)
{
siop_regmap_p rp = sc->sc_siopp;
int nchain;
int count, tcount;
char *addr, *dmaend;
struct siop_acb *acb = sc->sc_nexus;
#ifdef DEBUG
int i;
#endif

#ifdef DEBUG
if (siop_debug & 0x100 && rp->siop_sbcl & SIOP_BSY) {
printf ("ACK! siop was busy: rp %p script %p dsa %p active %ld\n",
rp, &scripts, &acb->ds, sc->sc_active);
printf ("istat %02x sfbr %02x lcrc %02x sien %02x dien %02x\n",
rp->siop_istat, rp->siop_sfbr, rp->siop_lcrc,
rp->siop_sien, rp->siop_dien);
#ifdef DDB
/*Debugger();*/
#endif
}
#endif
acb->msgout[0] = MSG_IDENTIFY | lun;
if (siop_allow_disc[target] & 2 ||
(siop_allow_disc[target] && len == 0))
acb->msgout[0] = MSG_IDENTIFY_DR | lun;
acb->status = 0;
acb->stat[0] = -1;
acb->msg[0] = -1;
acb->ds.scsi_addr = (0x10000 << target) | (sc->sc_sync[target].sxfer << 8);
acb->ds.idlen = 1;
acb->ds.idbuf = (char *) kvtop(&acb->msgout[0]);
acb->ds.cmdlen = clen;
acb->ds.cmdbuf = (char *) kvtop(cbuf);
acb->ds.stslen = 1;
acb->ds.stsbuf = (char *) kvtop(&acb->stat[0]);
acb->ds.msglen = 1;
acb->ds.msgbuf = (char *) kvtop(&acb->msg[0]);
acb->msg[1] = -1;
acb->ds.msginlen = 1;
acb->ds.extmsglen = 1;
acb->ds.synmsglen = 3;
acb->ds.msginbuf = (char *) kvtop(&acb->msg[1]);
acb->ds.extmsgbuf = (char *) kvtop(&acb->msg[2]);
acb->ds.synmsgbuf = (char *) kvtop(&acb->msg[3]);
memset(&acb->ds.chain, 0, sizeof (acb->ds.chain));

/*
* Negotiate wide is the initial negotiation state; since the 53c710
* doesn't do wide transfers, just begin the synchronous transfer
* negotiation here.
*/
if (sc->sc_sync[target].state == NEG_WIDE) {
if (siop_inhibit_sync[target]) {
sc->sc_sync[target].state = NEG_DONE;
sc->sc_sync[target].sbcl = 0;
sc->sc_sync[target].sxfer = 0;
#ifdef DEBUG
if (siopsync_debug)
printf ("Forcing target %d asynchronous\n", target);
#endif
}
else {
acb->msg[2] = -1;
acb->msgout[1] = MSG_EXT_MESSAGE;
acb->msgout[2] = 3;
acb->msgout[3] = MSG_SYNC_REQ;
#ifdef MAXTOR_SYNC_KLUDGE
acb->msgout[4] = 50 / 4; /* ask for ridiculous period */
#else
acb->msgout[4] = sc->sc_minsync;
#endif
acb->msgout[5] = SIOP_MAX_OFFSET;
acb->ds.idlen = 6;
sc->sc_sync[target].state = NEG_WAITS;
#ifdef DEBUG
if (siopsync_debug)
printf ("Sending sync request to target %d\n", target);
#endif
}
}

/*
* Build physical DMA addresses for scatter/gather I/O
*/
acb->iob_buf = buf;
acb->iob_len = len;
acb->iob_curbuf = acb->iob_curlen = 0;
nchain = 0;
count = len;
addr = buf;
dmaend = NULL;
while (count > 0) {
acb->ds.chain[nchain].databuf = (char *) kvtop (addr);
if (count < (tcount = PAGE_SIZE - ((int) addr & PGOFSET)))
tcount = count;
acb->ds.chain[nchain].datalen = tcount;
addr += tcount;
count -= tcount;
if (acb->ds.chain[nchain].databuf == dmaend) {
dmaend += acb->ds.chain[nchain].datalen;
acb->ds.chain[nchain].datalen = 0;
acb->ds.chain[--nchain].datalen += tcount;
#ifdef DEBUG
++siopdma_hits;
#endif
}
else {
dmaend = acb->ds.chain[nchain].databuf +
acb->ds.chain[nchain].datalen;
acb->ds.chain[nchain].datalen = tcount;
#ifdef DEBUG
if (nchain) /* Don't count miss on first one */
++siopdma_misses;
#endif
}
++nchain;
}
#ifdef DEBUG
if (nchain != 1 && len != 0 && siop_debug & 3) {
printf ("DMA chaining set: %d\n", nchain);
for (i = 0; i < nchain; ++i) {
printf (" [%d] %8p %lx\n", i, acb->ds.chain[i].databuf,
acb->ds.chain[i].datalen);
}
}
#endif

/* push data cache for all data the 53c710 needs to access */
dma_cachectl ((void *)acb, sizeof (struct siop_acb));
dma_cachectl (cbuf, clen);
if (buf != NULL && len != 0)
dma_cachectl (buf, len);
#ifdef DEBUG
if (siop_debug & 0x100 && rp->siop_sbcl & SIOP_BSY) {
printf ("ACK! siop was busy at start: rp %p script %p dsa %p active %ld\n",
rp, &scripts, &acb->ds, sc->sc_active);
#ifdef DDB
/*Debugger();*/
#endif
}
#endif
if (sc->nexus_list.tqh_first == NULL) {
callout_reset(&acb->xs->xs_callout,
mstohz(acb->xs->timeout) + 1, siop_timeout, acb);
if (rp->siop_istat & SIOP_ISTAT_CON)
printf("%s: siop_select while connected?\n",
device_xname(sc->sc_dev));
rp->siop_temp = 0;
rp->siop_sbcl = sc->sc_sync[target].sbcl;
rp->siop_dsa = kvtop((void *)&acb->ds);
rp->siop_dsp = sc->sc_scriptspa;
SIOP_TRACE('s',1,0,0)
} else {
if ((rp->siop_istat & SIOP_ISTAT_CON) == 0) {
rp->siop_istat = SIOP_ISTAT_SIGP;
SIOP_TRACE('s',2,0,0);
}
else {
SIOP_TRACE('s',3,rp->siop_istat,0);
}
}
#ifdef DEBUG
++siopstarts;
#endif
}

/*
* Process a DMA or SCSI interrupt from the 53C710 SIOP
*/

int
siop_checkintr(struct siop_softc *sc, u_char istat, u_char dstat,
u_char sstat0, int *status)
{
siop_regmap_p rp = sc->sc_siopp;
struct siop_acb *acb = sc->sc_nexus;
int target = 0;
int dfifo, dbc, sstat1;

dfifo = rp->siop_dfifo;
dbc = rp->siop_dbc0;
sstat1 = rp->siop_sstat1;
rp->siop_ctest8 |= SIOP_CTEST8_CLF;
while ((rp->siop_ctest1 & SIOP_CTEST1_FMT) != SIOP_CTEST1_FMT)
;
rp->siop_ctest8 &= ~SIOP_CTEST8_CLF;
#ifdef DEBUG
++siopints;
#if 0
if (siop_debug & 0x100) {
DCIAS(&acb->stat[0]); /* XXX */
printf ("siopchkintr: istat %x dstat %x sstat0 %x dsps %x sbcl %x sts %x msg %x\n",
istat, dstat, sstat0, rp->siop_dsps, rp->siop_sbcl, acb->stat[0], acb->msg[0]);
printf ("sync msg in: %02x %02x %02x %02x %02x %02x\n",
acb->msg[0], acb->msg[1], acb->msg[2],
acb->msg[3], acb->msg[4], acb->msg[5]);
}
#endif
if (rp->siop_dsp && (rp->siop_dsp < sc->sc_scriptspa ||
rp->siop_dsp >= sc->sc_scriptspa + sizeof(scripts))) {
printf ("%s: dsp not within script dsp %lx scripts %lx:%lx",
device_xname(sc->sc_dev), rp->siop_dsp, sc->sc_scriptspa,
sc->sc_scriptspa + sizeof(scripts));
printf(" istat %x dstat %x sstat0 %x\n",
istat, dstat, sstat0);
#ifdef DDB
Debugger();
#endif
}
#endif
SIOP_TRACE('i',dstat,istat,(istat&SIOP_ISTAT_DIP)?rp->siop_dsps&0xff:sstat0);
if (dstat & SIOP_DSTAT_SIR && rp->siop_dsps == 0xff00) {
/* Normal completion status, or check condition */
#ifdef DEBUG
if (rp->siop_dsa != kvtop((void *)&acb->ds)) {
printf ("siop: invalid dsa: %lx %x\n", rp->siop_dsa,
(unsigned)kvtop((void *)&acb->ds));
panic("*** siop DSA invalid ***");
}
#endif
target = acb->xs->xs_periph->periph_target;
if (sc->sc_sync[target].state == NEG_WAITS) {
if (acb->msg[1] == 0xff)
printf ("%s: target %d ignored sync request\n",
device_xname(sc->sc_dev), target);
else if (acb->msg[1] == MSG_REJECT)
printf ("%s: target %d rejected sync request\n",
device_xname(sc->sc_dev), target);
else
/* XXX - need to set sync transfer parameters */
printf("%s: target %d (sync) %02x %02x %02x\n",
device_xname(sc->sc_dev), target, acb->msg[1],
acb->msg[2], acb->msg[3]);
sc->sc_sync[target].state = NEG_DONE;
}
dma_cachectl(&acb->stat[0], 1);
*status = acb->stat[0];
#ifdef DEBUG
if (rp->siop_sbcl & SIOP_BSY) {
/*printf ("ACK! siop was busy at end: rp %x script %x dsa %x\n",
rp, &scripts, &acb->ds);*/
#ifdef DDB
/*Debugger();*/
#endif
}
if (acb->msg[0] != 0x00)
printf("%s: message was not COMMAND COMPLETE: %x\n",
device_xname(sc->sc_dev), acb->msg[0]);
#endif
if (sc->nexus_list.tqh_first)
rp->siop_dcntl |= SIOP_DCNTL_STD;
return 1;
}
if (dstat & SIOP_DSTAT_SIR && rp->siop_dsps == 0xff0b) {
target = acb->xs->xs_periph->periph_target;
if (acb->msg[1] == MSG_EXT_MESSAGE && acb->msg[2] == 3 &&
acb->msg[3] == MSG_SYNC_REQ) {
#ifdef DEBUG
if (siopsync_debug)
printf ("sync msg in: %02x %02x %02x %02x %02x %02x\n",
acb->msg[0], acb->msg[1], acb->msg[2],
acb->msg[3], acb->msg[4], acb->msg[5]);
#endif
sc->sc_sync[target].sxfer = 0;
sc->sc_sync[target].sbcl = 0;
if (acb->msg[2] == 3 &&
acb->msg[3] == MSG_SYNC_REQ &&
acb->msg[5] != 0) {
#ifdef MAXTOR_KLUDGE
/*
* Kludge for my Maxtor XT8580S
* It accepts whatever we request, even
* though it won't work. So we ask for
* a short period than we can handle. If
* the device says it can do it, use 208ns.
* If the device says it can do less than
* 100ns, then we limit it to 100ns.
*/
if (acb->msg[4] && acb->msg[4] < 100 / 4) {
#ifdef DEBUG
printf ("%d: target %d wanted %dns period\n",
device_xname(sc->sc_dev), target,
acb->msg[4] * 4);
#endif
if (acb->msg[4] == 50 / 4)
acb->msg[4] = 208 / 4;
else
acb->msg[4] = 100 / 4;
}
#endif /* MAXTOR_KLUDGE */
printf ("%s: target %d now synchronous, period=%dns, offset=%d\n",
device_xname(sc->sc_dev), target,
acb->msg[4] * 4, acb->msg[5]);
scsi_period_to_siop (sc, target);
}
rp->siop_sxfer = sc->sc_sync[target].sxfer;
rp->siop_sbcl = sc->sc_sync[target].sbcl;
if (sc->sc_sync[target].state == NEG_WAITS) {
sc->sc_sync[target].state = NEG_DONE;
rp->siop_dsp = sc->sc_scriptspa + Ent_clear_ack;
return(0);
}
rp->siop_dcntl |= SIOP_DCNTL_STD;
sc->sc_sync[target].state = NEG_DONE;
return (0);
}
/* XXX - not SDTR message */
}
if (sstat0 & SIOP_SSTAT0_M_A) { /* Phase mismatch */
#ifdef DEBUG
++siopphmm;
if (acb == NULL)
printf("%s: Phase mismatch with no active command?\n",
device_xname(sc->sc_dev));
#endif
if (acb->iob_len) {
int adjust;
adjust = ((dfifo - (dbc & 0x7f)) & 0x7f);
if (sstat1 & SIOP_SSTAT1_ORF)
++adjust;
if (sstat1 & SIOP_SSTAT1_OLF)
++adjust;
acb->iob_curlen =
*((long *)__UNVOLATILE(&rp->siop_dcmd)) & 0xffffff;
acb->iob_curlen += adjust;
acb->iob_curbuf =
*((long *)__UNVOLATILE(&rp->siop_dnad)) - adjust;
#ifdef DEBUG
if (siop_debug & 0x100) {
int i;
printf ("Phase mismatch: curbuf %lx curlen %lx dfifo %x dbc %x sstat1 %x adjust %x sbcl %x starts %d acb %p\n",
acb->iob_curbuf, acb->iob_curlen, dfifo,
dbc, sstat1, adjust, rp->siop_sbcl,
siopstarts, acb);
if (acb->ds.chain[1].datalen) {
for (i = 0; acb->ds.chain[i].datalen; ++i)
printf("chain[%d] addr %p len %lx\n",
i, acb->ds.chain[i].databuf,
acb->ds.chain[i].datalen);
}
}
#endif
dma_cachectl ((void *)acb, sizeof(*acb));
}
#ifdef DEBUG
SIOP_TRACE('m',rp->siop_sbcl,(rp->siop_dsp>>8),rp->siop_dsp);
if (siop_debug & 9)
printf ("Phase mismatch: %x dsp +%lx dcmd %lx\n",
rp->siop_sbcl,
rp->siop_dsp - sc->sc_scriptspa,
*((volatile long *)&rp->siop_dcmd));
#endif
if ((rp->siop_sbcl & SIOP_REQ) == 0) {
printf ("Phase mismatch: REQ not asserted! %02x dsp %lx\n",
rp->siop_sbcl, rp->siop_dsp);
#if defined(DEBUG) && defined(DDB)
/*Debugger(); XXX is*/
#endif
}
switch (rp->siop_sbcl & 7) {
case 0: /* data out */
case 1: /* data in */
case 2: /* status */
case 3: /* command */
case 6: /* message in */
case 7: /* message out */
rp->siop_dsp = sc->sc_scriptspa + Ent_switch;
break;
default:
goto bad_phase;
}
return 0;
}
if (sstat0 & SIOP_SSTAT0_STO) { /* Select timed out */
#ifdef DEBUG
if (acb == NULL)
printf("%s: Select timeout with no active command?\n",
device_xname(sc->sc_dev));
if (rp->siop_sbcl & SIOP_BSY) {
printf ("ACK! siop was busy at timeout: rp %p script %p dsa %p\n",
rp, &scripts, &acb->ds);
printf(" sbcl %x sdid %x istat %x dstat %x sstat0 %x\n",
rp->siop_sbcl, rp->siop_sdid, istat, dstat, sstat0);
if (!(rp->siop_sbcl & SIOP_BSY)) {
printf ("Yikes, it's not busy now!\n");
#if 0
*status = -1;
if (sc->nexus_list.tqh_first)
rp->siop_dsp = sc->sc_scriptspa + Ent_wait_reselect;
return 1;
#endif
}
/* rp->siop_dcntl |= SIOP_DCNTL_STD;*/
return (0);
}
#endif
*status = -1;
acb->xs->error = XS_SELTIMEOUT;
if (sc->nexus_list.tqh_first)
rp->siop_dsp = sc->sc_scriptspa + Ent_wait_reselect;
return 1;
}
if (acb)
target = acb->xs->xs_periph->periph_target;
else
target = 7;
if (sstat0 & SIOP_SSTAT0_UDC) {
#ifdef DEBUG
if (acb == NULL)
printf("%s: Unexpected disconnect with no active command?\n",
device_xname(sc->sc_dev));
printf ("%s: target %d disconnected unexpectedly\n",
device_xname(sc->sc_dev), target);
#endif
#if 0
siopabort (sc, rp, "siopchkintr");
#endif
*status = STS_BUSY;
if (sc->nexus_list.tqh_first)
rp->siop_dsp = sc->sc_scriptspa + Ent_wait_reselect;
return (acb != NULL);
}
if (dstat & SIOP_DSTAT_SIR && (rp->siop_dsps == 0xff01 ||
rp->siop_dsps == 0xff02)) {
#ifdef DEBUG
if (siop_debug & 0x100)
printf ("%s: ID %02x disconnected TEMP %lx (+%lx) curbuf %lx curlen %lx buf %p len %lx dfifo %x dbc %x sstat1 %x starts %d acb %p\n",
device_xname(sc->sc_dev), 1 << target, rp->siop_temp,
rp->siop_temp ? rp->siop_temp - sc->sc_scriptspa : 0,
acb->iob_curbuf, acb->iob_curlen,
acb->ds.chain[0].databuf, acb->ds.chain[0].datalen, dfifo, dbc, sstat1, siopstarts, acb);
#endif
if (acb == NULL) {
printf("%s: Disconnect with no active command?\n",
device_xname(sc->sc_dev));
return (0);
}
/*
* XXXX need to update iob_curbuf/iob_curlen to reflect
* current data transferred. If device disconnected in
* the middle of a DMA block, they should already be set
* by the phase change interrupt. If the disconnect
* occurs on a DMA block boundary, we have to figure out
* which DMA block it was.
*/
if (acb->iob_len && rp->siop_temp) {
int n = rp->siop_temp - sc->sc_scriptspa;

if (acb->iob_curlen && acb->iob_curlen != acb->ds.chain[0].datalen)
printf("%s: iob_curbuf/len already set? n %x iob %lx/%lx chain[0] %p/%lx\n",
device_xname(sc->sc_dev), n, acb->iob_curbuf, acb->iob_curlen,
acb->ds.chain[0].databuf, acb->ds.chain[0].datalen);
if (n < Ent_datain)
n = (n - Ent_dataout) / 16;
else
n = (n - Ent_datain) / 16;
if (n <= 0 && n > DMAMAXIO)
printf("TEMP invalid %d\n", n);
else {
acb->iob_curbuf = (u_long)acb->ds.chain[n].databuf;
acb->iob_curlen = acb->ds.chain[n].datalen;
}
#ifdef DEBUG
if (siop_debug & 0x100) {
printf("%s: TEMP offset %d", device_xname(sc->sc_dev), n);
printf(" curbuf %lx curlen %lx\n", acb->iob_curbuf,
acb->iob_curlen);
}
#endif
}
/*
* If data transfer was interrupted by disconnect, iob_curbuf
* and iob_curlen should reflect the point of interruption.
* Adjust the DMA chain so that the data transfer begins
* at the appropriate place upon reselection.
* XXX This should only be done on save data pointer message?
*/
if (acb->iob_curlen) {
int i, j;

#ifdef DEBUG
if (siop_debug & 0x100)
printf ("%s: adjusting DMA chain\n",
device_xname(sc->sc_dev));
if (rp->siop_dsps == 0xff02)
printf ("%s: ID %02x disconnected without Save Data Pointers\n",
device_xname(sc->sc_dev), 1 << target);
#endif
/* XXX is: if (rp->siop_dsps != 0xff02) { */
/* not disconnected without save data ptr */
for (i = 0; i < DMAMAXIO; ++i) {
if (acb->ds.chain[i].datalen == 0)
break;
if (acb->iob_curbuf >= (long)acb->ds.chain[i].databuf &&
acb->iob_curbuf < (long)(acb->ds.chain[i].databuf +
acb->ds.chain[i].datalen))
break;
}
if (i >= DMAMAXIO || acb->ds.chain[i].datalen == 0) {
printf("couldn't find saved data pointer: ");
printf("curbuf %lx curlen %lx i %d\n",
acb->iob_curbuf, acb->iob_curlen, i);
#ifdef DDB
Debugger();
#endif
}
/* XXX is: } */
#ifdef DEBUG
if (siop_debug & 0x100)
printf(" chain[0]: %p/%lx -> %lx/%lx\n",
acb->ds.chain[0].databuf,
acb->ds.chain[0].datalen,
acb->iob_curbuf,
acb->iob_curlen);
#endif
acb->ds.chain[0].databuf = (char *)acb->iob_curbuf;
acb->ds.chain[0].datalen = acb->iob_curlen;
for (j = 1, ++i; i < DMAMAXIO && acb->ds.chain[i].datalen; ++i, ++j) {
#ifdef DEBUG
if (siop_debug & 0x100)
printf(" chain[%d]: %p/%lx -> %p/%lx\n", j,
acb->ds.chain[j].databuf,
acb->ds.chain[j].datalen,
acb->ds.chain[i].databuf,
acb->ds.chain[i].datalen);
#endif
acb->ds.chain[j].databuf = acb->ds.chain[i].databuf;
acb->ds.chain[j].datalen = acb->ds.chain[i].datalen;
}
if (j < DMAMAXIO)
acb->ds.chain[j].datalen = 0;
DCIAS(kvtop((void *)&acb->ds.chain));
}
++sc->sc_tinfo[target].dconns;
/*
* add nexus to waiting list
* clear nexus
* try to start another command for another target/lun
*/
acb->status = sc->sc_flags & SIOP_INTSOFF;
TAILQ_INSERT_HEAD(&sc->nexus_list, acb, chain);
sc->sc_nexus = NULL; /* no current device */
/* start script to wait for reselect */
if (sc->sc_nexus == NULL)
rp->siop_dsp = sc->sc_scriptspa + Ent_wait_reselect;
/* XXXX start another command ? */
if (sc->ready_list.tqh_first)
siop_sched(sc);
return (0);
}
if (dstat & SIOP_DSTAT_SIR && rp->siop_dsps == 0xff03) {
int reselid = rp->siop_scratch & 0x7f;
int reselun = rp->siop_sfbr & 0x07;

sc->sc_sstat1 = rp->siop_sbcl; /* XXXX save current SBCL */
#ifdef DEBUG
if (siop_debug & 0x100)
printf ("%s: target ID %02x reselected dsps %lx\n",
device_xname(sc->sc_dev), reselid,
rp->siop_dsps);
if ((rp->siop_sfbr & 0x80) == 0)
printf("%s: Reselect message in was not identify: %x\n",
device_xname(sc->sc_dev), rp->siop_sfbr);
#endif
if (sc->sc_nexus) {
#ifdef DEBUG
if (siop_debug & 0x100)
printf ("%s: reselect ID %02x w/active\n",
device_xname(sc->sc_dev), reselid);
#endif
TAILQ_INSERT_HEAD(&sc->ready_list, sc->sc_nexus, chain);
sc->sc_tinfo[sc->sc_nexus->xs->xs_periph->periph_target].lubusy
&= ~(1 << sc->sc_nexus->xs->xs_periph->periph_lun);
--sc->sc_active;
}
/*
* locate acb of reselecting device
* set sc->sc_nexus to acb
*/
for (acb = sc->nexus_list.tqh_first; acb;
acb = acb->chain.tqe_next) {
if (reselid != (acb->ds.scsi_addr >> 16) ||
reselun != (acb->msgout[0] & 0x07))
continue;
TAILQ_REMOVE(&sc->nexus_list, acb, chain);
sc->sc_nexus = acb;
sc->sc_flags |= acb->status;
acb->status = 0;
DCIAS(kvtop(&acb->stat[0]));
rp->siop_dsa = kvtop((void *)&acb->ds);
rp->siop_sxfer =
sc->sc_sync[acb->xs->xs_periph->periph_target].sxfer;
rp->siop_sbcl =
sc->sc_sync[acb->xs->xs_periph->periph_target].sbcl;
break;
}
if (acb == NULL) {
printf("%s: target ID %02x reselect nexus_list %p\n",
device_xname(sc->sc_dev), reselid,
sc->nexus_list.tqh_first);
panic("unable to find reselecting device");
}
dma_cachectl ((void *)acb, sizeof(*acb));
rp->siop_temp = 0;
rp->siop_dcntl |= SIOP_DCNTL_STD;
return (0);
}
if (dstat & SIOP_DSTAT_SIR && rp->siop_dsps == 0xff04) {
#ifdef DEBUG
u_short ctest2 = rp->siop_ctest2;

/* reselect was interrupted (by Sig_P or select) */
if (siop_debug & 0x100 ||
(ctest2 & SIOP_CTEST2_SIGP) == 0)
printf ("%s: reselect interrupted (Sig_P?) scntl1 %x ctest2 %x sfbr %x istat %x/%x\n",
device_xname(sc->sc_dev), rp->siop_scntl1,
ctest2, rp->siop_sfbr, istat, rp->siop_istat);
#endif
/* XXX assumes it was not select */
if (sc->sc_nexus == NULL) {
#ifdef DEBUG
printf("%s: reselect interrupted, sc_nexus == NULL\n",
device_xname(sc->sc_dev));
#if 0
siop_dump(sc);
#ifdef DDB
Debugger();
#endif
#endif
#endif
rp->siop_dcntl |= SIOP_DCNTL_STD;
return(0);
}
target = sc->sc_nexus->xs->xs_periph->periph_target;
rp->siop_temp = 0;
rp->siop_dsa = kvtop((void *)&sc->sc_nexus->ds);
rp->siop_sxfer = sc->sc_sync[target].sxfer;
rp->siop_sbcl = sc->sc_sync[target].sbcl;
rp->siop_dsp = sc->sc_scriptspa;
return (0);
}
if (dstat & SIOP_DSTAT_SIR && rp->siop_dsps == 0xff06) {
if (acb == NULL)
printf("%s: Bad message-in with no active command?\n",
device_xname(sc->sc_dev));
/* Unrecognized message in byte */
dma_cachectl (&acb->msg[1],1);
printf ("%s: Unrecognized message in data sfbr %x msg %x sbcl %x\n",
device_xname(sc->sc_dev), rp->siop_sfbr, acb->msg[1], rp->siop_sbcl);
/* what should be done here? */
DCIAS(kvtop(&acb->msg[1]));
rp->siop_dsp = sc->sc_scriptspa + Ent_clear_ack;
return (0);
}
if (dstat & SIOP_DSTAT_SIR && rp->siop_dsps == 0xff0a) {
/* Status phase wasn't followed by message in phase? */
printf ("%s: Status phase not followed by message in phase? sbcl %x sbdl %x\n",
device_xname(sc->sc_dev), rp->siop_sbcl, rp->siop_sbdl);
if (rp->siop_sbcl == 0xa7) {
/* It is now, just continue the script? */
rp->siop_dcntl |= SIOP_DCNTL_STD;
return (0);
}
}
if (sstat0 == 0 && dstat & SIOP_DSTAT_SIR) {
dma_cachectl (&acb->stat[0], 1);
dma_cachectl (&acb->msg[0], 1);
printf ("SIOP interrupt: %lx sts %x msg %x %x sbcl %x\n",
rp->siop_dsps, acb->stat[0], acb->msg[0], acb->msg[1],
rp->siop_sbcl);
siopreset (sc);
*status = -1;
return 0; /* siopreset has cleaned up */
}
if (sstat0 & SIOP_SSTAT0_SGE)
printf ("SIOP: SCSI Gross Error\n");
if (sstat0 & SIOP_SSTAT0_PAR)
printf ("SIOP: Parity Error\n");
if (dstat & SIOP_DSTAT_IID)
printf ("SIOP: Invalid instruction detected\n");
bad_phase:
/*
* temporary panic for unhandled conditions
* displays various things about the 53C710 status and registers
* then panics.
* XXXX need to clean this up to print out the info, reset, and continue
*/
printf ("siopchkintr: target %x ds %p\n", target, &acb->ds);
printf ("scripts %lx ds %x rp %x dsp %lx dcmd %lx\n",
sc->sc_scriptspa, (unsigned)kvtop((void *)&acb->ds),
(unsigned)kvtop((void *)__UNVOLATILE(rp)), rp->siop_dsp,
*((volatile long *)&rp->siop_dcmd));
printf ("siopchkintr: istat %x dstat %x sstat0 %x dsps %lx dsa %lx sbcl %x sts %x msg %x %x sfbr %x\n",
istat, dstat, sstat0, rp->siop_dsps, rp->siop_dsa,
rp->siop_sbcl, acb->stat[0], acb->msg[0], acb->msg[1], rp->siop_sfbr);
#ifdef DEBUG
if (siop_debug & 0x20)
panic("siopchkintr: **** temp ****");
#endif
#ifdef DDB
Debugger ();
#endif
siopreset (sc); /* hard reset */
*status = -1;
return 0; /* siopreset cleaned up */
}

void
siop_select(struct siop_softc *sc)
{
siop_regmap_p rp;
struct siop_acb *acb = sc->sc_nexus;

#ifdef DEBUG
if (siop_debug & 1)
printf ("%s: select ", device_xname(sc->sc_dev));
#endif

rp = sc->sc_siopp;
if (acb->xs->xs_control & XS_CTL_POLL || siop_no_dma) {
sc->sc_flags |= SIOP_INTSOFF;
sc->sc_flags &= ~SIOP_INTDEFER;
if ((rp->siop_istat & 0x08) == 0) {
rp->siop_sien = 0;
rp->siop_dien = 0;
}
#if 0
} else if ((sc->sc_flags & SIOP_INTDEFER) == 0) {
sc->sc_flags &= ~SIOP_INTSOFF;
if ((rp->siop_istat & 0x08) == 0) {
rp->siop_sien = sc->sc_sien;
rp->siop_dien = sc->sc_dien;
}
#endif
}
#ifdef DEBUG
if (siop_debug & 1)
printf ("siop_select: target %x cmd %02x ds %p\n",
acb->xs->xs_periph->periph_target, acb->cmd.opcode,
&sc->sc_nexus->ds);
#endif

siop_start(sc, acb->xs->xs_periph->periph_target,
acb->xs->xs_periph->periph_lun,
(u_char *)&acb->cmd, acb->clen, acb->daddr, acb->dleft);

return;
}

/*
* 53C710 interrupt handler
*/

void
siopintr(register struct siop_softc *sc)
{
siop_regmap_p rp;
register u_char istat, dstat, sstat0;
int status;
int s = splbio();

istat = sc->sc_istat;
if ((istat & (SIOP_ISTAT_SIP | SIOP_ISTAT_DIP)) == 0) {
splx(s);
return;
}

/* Got a valid interrupt on this device */
rp = sc->sc_siopp;
dstat = sc->sc_dstat;
sstat0 = sc->sc_sstat0;
if (dstat & SIOP_DSTAT_SIR)
sc->sc_intcode = rp->siop_dsps;
sc->sc_istat = 0;
#ifdef DEBUG
if (siop_debug & 1)
printf ("%s: intr istat %x dstat %x sstat0 %x\n",
device_xname(sc->sc_dev), istat, dstat, sstat0);
if (!sc->sc_active) {
printf ("%s: spurious interrupt? istat %x dstat %x sstat0 %x nexus %p status %x\n",
device_xname(sc->sc_dev), istat, dstat, sstat0,
sc->sc_nexus, sc->sc_nexus ? sc->sc_nexus->stat[0] : 0);
}
#endif

#ifdef DEBUG
if (siop_debug & 5) {
DCIAS(kvtop(&sc->sc_nexus->stat[0]));
printf ("%s: intr istat %x dstat %x sstat0 %x dsps %lx sbcl %x sts %x msg %x\n",
device_xname(sc->sc_dev), istat, dstat, sstat0,
rp->siop_dsps, rp->siop_sbcl,
sc->sc_nexus->stat[0], sc->sc_nexus->msg[0]);
}
#endif
if (sc->sc_flags & SIOP_INTDEFER) {
sc->sc_flags &= ~(SIOP_INTDEFER | SIOP_INTSOFF);
rp->siop_sien = sc->sc_sien;
rp->siop_dien = sc->sc_dien;
}
if (siop_checkintr (sc, istat, dstat, sstat0, &status)) {
#if 1
if (status == 0xff)
printf ("siopintr: status == 0xff\n");
#endif
if ((sc->sc_flags & (SIOP_INTSOFF | SIOP_INTDEFER)) != SIOP_INTSOFF) {
#if 0
if (rp->siop_sbcl & SIOP_BSY) {
printf ("%s: SCSI bus busy at completion",
device_xname(sc->sc_dev));
printf(" targ %d sbcl %02x sfbr %x lcrc %02x dsp +%x\n",
sc->sc_nexus->xs->xs_periph->periph_target,
rp->siop_sbcl, rp->siop_sfbr, rp->siop_lcrc,
rp->siop_dsp - sc->sc_scriptspa);
}
#endif
siop_scsidone(sc->sc_nexus, sc->sc_nexus ?
sc->sc_nexus->stat[0] : -1);
}
}
splx(s);
}

/*
* This is based on the Progressive Peripherals 33Mhz Zeus driver and will
* not be correct for other 53c710 boards.
*
*/
void
scsi_period_to_siop(struct siop_softc *sc, int target)
{
int period, offset, sxfer, sbcl = 0;
#ifdef DEBUG_SYNC
int i;
#endif

period = sc->sc_nexus->msg[4];
offset = sc->sc_nexus->msg[5];
#ifdef DEBUG_SYNC
sxfer = 0;
if (offset <= SIOP_MAX_OFFSET)
sxfer = offset;
for (i = 0; i < sizeof (sync_tab) / 2; ++i) {
if (period <= sync_tab[i].p) {
sxfer |= sync_tab[i].r & 0x70;
sbcl = sync_tab[i].r & 0x03;
break;
}
}
printf ("siop sync old: siop_sxfr %02x, siop_sbcl %02x\n", sxfer, sbcl);
#endif
for (sbcl = 1; sbcl < 4; ++sbcl) {
sxfer = (period * 4 - 1) / sc->sc_tcp[sbcl] - 3;
if (sxfer >= 0 && sxfer <= 7)
break;
}
if (sbcl > 3) {
printf("siop sync: unable to compute sync params for period %dns\n",
period * 4);
/*
* XXX need to pick a value we can do and renegotiate
*/
sxfer = sbcl = 0;
} else {
sxfer = (sxfer << 4) | ((offset <= SIOP_MAX_OFFSET) ?
offset : SIOP_MAX_OFFSET);
#ifdef DEBUG_SYNC
printf("siop sync: params for period %dns: sxfer %x sbcl %x",
period * 4, sxfer, sbcl);
printf(" actual period %dns\n",
sc->sc_tcp[sbcl] * ((sxfer >> 4) + 4));
#endif
}
sc->sc_sync[target].sxfer = sxfer;
sc->sc_sync[target].sbcl = sbcl;
#ifdef DEBUG_SYNC
printf ("siop sync: siop_sxfr %02x, siop_sbcl %02x\n", sxfer, sbcl);
#endif
}

#ifdef DEBUG

#if SIOP_TRACE_SIZE
void
siop_dump_trace(void)
{
int i;

printf("siop trace: next index %d\n", siop_trix);
i = siop_trix;
do {
printf("%3d: '%c' %02x %02x %02x\n", i, siop_trbuf[i],
siop_trbuf[i + 1], siop_trbuf[i + 2], siop_trbuf[i + 3]);
i = (i + 4) & (SIOP_TRACE_SIZE - 1);
} while (i != siop_trix);
}
#endif

void
siop_dump_acb(struct siop_acb *acb)
{
u_char *b = (u_char *) &acb->cmd;
int i;

printf("acb@%p ", acb);
if (acb->xs == NULL) {
printf("<unused>\n");
return;
}
printf("(%d:%d) flags %2x clen %2d cmd ",
acb->xs->xs_periph->periph_target,
acb->xs->xs_periph->periph_lun, acb->flags, acb->clen);
for (i = acb->clen; i; --i)
printf(" %02x", *b++);
printf("\n");
printf(" xs: %p data %p:%04x ", acb->xs, acb->xs->data,
acb->xs->datalen);
printf("va %p:%lx ", acb->iob_buf, acb->iob_len);
printf("cur %lx:%lx\n", acb->iob_curbuf, acb->iob_curlen);
}

void
siop_dump(struct siop_softc *sc)
{
struct siop_acb *acb;
siop_regmap_p rp = sc->sc_siopp;
int s;
int i;

s = splbio();
#if SIOP_TRACE_SIZE
siop_dump_trace();
#endif
printf("%s@%p regs %p istat %x\n",
device_xname(sc->sc_dev), sc, rp, rp->siop_istat);
if ((acb = sc->free_list.tqh_first) > 0) {
printf("Free list:\n");
while (acb) {
siop_dump_acb(acb);
acb = acb->chain.tqe_next;
}
}
if ((acb = sc->ready_list.tqh_first) > 0) {
printf("Ready list:\n");
while (acb) {
siop_dump_acb(acb);
acb = acb->chain.tqe_next;
}
}
if ((acb = sc->nexus_list.tqh_first) > 0) {
printf("Nexus list:\n");
while (acb) {
siop_dump_acb(acb);
acb = acb->chain.tqe_next;
}
}
if (sc->sc_nexus) {
printf("Nexus:\n");
siop_dump_acb(sc->sc_nexus);
}
for (i = 0; i < 8; ++i) {
if (sc->sc_tinfo[i].cmds > 2) {
printf("tgt %d: cmds %d disc %d lubusy %x\n",
i, sc->sc_tinfo[i].cmds,
sc->sc_tinfo[i].dconns,
sc->sc_tinfo[i].lubusy);
}
}
splx(s);
}
#endif