root/sys/dev/ic/esiop.c 
/*      $NetBSD: esiop.c,v 1.63 2024/02/08 19:44:08 andvar Exp $        */

/*
 * Copyright (c) 2002 Manuel Bouyer.
 *
 * 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.
 *
 */

/* SYM53c7/8xx PCI-SCSI I/O Processors driver */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: esiop.c,v 1.63 2024/02/08 19:44:08 andvar Exp $");

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

#include <machine/endian.h>
#include <sys/bus.h>

#include <dev/microcode/siop/esiop.out>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsi_message.h>
#include <dev/scsipi/scsipi_all.h>

#include <dev/scsipi/scsiconf.h>

#include <dev/ic/siopreg.h>
#include <dev/ic/siopvar_common.h>
#include <dev/ic/esiopvar.h>

#include "opt_siop.h"

/*
#define SIOP_DEBUG
#define SIOP_DEBUG_DR
#define SIOP_DEBUG_INTR
#define SIOP_DEBUG_SCHED
#define SIOP_DUMP_SCRIPT
*/

#define SIOP_STATS

#ifndef SIOP_DEFAULT_TARGET
#define SIOP_DEFAULT_TARGET 7
#endif

/* number of cmd descriptors per block */
#define SIOP_NCMDPB (PAGE_SIZE / sizeof(struct esiop_xfer))

void    esiop_reset(struct esiop_softc *);
void    esiop_checkdone(struct esiop_softc *);
void    esiop_handle_reset(struct esiop_softc *);
void    esiop_scsicmd_end(struct esiop_cmd *, int);
void    esiop_unqueue(struct esiop_softc *, int, int);
int     esiop_handle_qtag_reject(struct esiop_cmd *);
static void     esiop_start(struct esiop_softc *, struct esiop_cmd *);
void    esiop_timeout(void *);
void    esiop_scsipi_request(struct scsipi_channel *,
                        scsipi_adapter_req_t, void *);
void    esiop_dump_script(struct esiop_softc *);
void    esiop_morecbd(struct esiop_softc *);
void    esiop_moretagtbl(struct esiop_softc *);
void    siop_add_reselsw(struct esiop_softc *, int);
void    esiop_target_register(struct esiop_softc *, uint32_t);

void    esiop_update_scntl3(struct esiop_softc *, struct siop_common_target *);

#ifdef SIOP_STATS
static int esiop_stat_intr = 0;
static int esiop_stat_intr_shortxfer = 0;
static int esiop_stat_intr_sdp = 0;
static int esiop_stat_intr_done = 0;
static int esiop_stat_intr_xferdisc = 0;
static int esiop_stat_intr_lunresel = 0;
static int esiop_stat_intr_qfull = 0;
void esiop_printstats(void);
#define INCSTAT(x) x++
#else
#define INCSTAT(x)
#endif

static inline void esiop_script_sync(struct esiop_softc *, int);
static inline void
esiop_script_sync(struct esiop_softc *sc, int ops)
{

        if ((sc->sc_c.features & SF_CHIP_RAM) == 0)
                bus_dmamap_sync(sc->sc_c.sc_dmat, sc->sc_c.sc_scriptdma, 0,
                    PAGE_SIZE, ops);
}

static inline uint32_t esiop_script_read(struct esiop_softc *, u_int);
static inline uint32_t
esiop_script_read(struct esiop_softc *sc, u_int offset)
{

        if (sc->sc_c.features & SF_CHIP_RAM) {
                return bus_space_read_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh,
                    offset * 4);
        } else {
                return le32toh(sc->sc_c.sc_script[offset]);
        }
}

static inline void esiop_script_write(struct esiop_softc *, u_int,
        uint32_t);
static inline void
esiop_script_write(struct esiop_softc *sc, u_int offset, uint32_t val)
{

        if (sc->sc_c.features & SF_CHIP_RAM) {
                bus_space_write_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh,
                    offset * 4, val);
        } else {
                sc->sc_c.sc_script[offset] = htole32(val);
        }
}

void
esiop_attach(struct esiop_softc *sc)
{
        struct esiop_dsatbl *tagtbl_donering;

        if (siop_common_attach(&sc->sc_c) != 0 )
                return;

        TAILQ_INIT(&sc->free_list);
        TAILQ_INIT(&sc->cmds);
        TAILQ_INIT(&sc->free_tagtbl);
        TAILQ_INIT(&sc->tag_tblblk);
        sc->sc_currschedslot = 0;
#ifdef SIOP_DEBUG
        aprint_debug_dev(sc->sc_c.sc_dev,
            "script size = %d, PHY addr=0x%x, VIRT=%p\n",
            (int)sizeof(esiop_script),
            (uint32_t)sc->sc_c.sc_scriptaddr, sc->sc_c.sc_script);
#endif

        sc->sc_c.sc_adapt.adapt_max_periph = ESIOP_NTAG;
        sc->sc_c.sc_adapt.adapt_request = esiop_scsipi_request;

        /*
         * get space for the CMD done slot. For this we use a tag table entry.
         * It's the same size and allows us to not waste 3/4 of a page
         */
#ifdef DIAGNOSTIC
        if (ESIOP_NTAG != A_ndone_slots) {
                aprint_error_dev(sc->sc_c.sc_dev,
                     "size of tag DSA table different from the done ring\n");
                return;
        }
#endif
        esiop_moretagtbl(sc);
        tagtbl_donering = TAILQ_FIRST(&sc->free_tagtbl);
        if (tagtbl_donering == NULL) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "no memory for command done ring\n");
                return;
        }
        TAILQ_REMOVE(&sc->free_tagtbl, tagtbl_donering, next);
        sc->sc_done_map = tagtbl_donering->tblblk->blkmap;
        sc->sc_done_offset = tagtbl_donering->tbl_offset;
        sc->sc_done_slot = &tagtbl_donering->tbl[0];

        /* Do a bus reset, so that devices fall back to narrow/async */
        siop_resetbus(&sc->sc_c);
        /*
         * siop_reset() will reset the chip, thus clearing pending interrupts
         */
        esiop_reset(sc);
#ifdef SIOP_DUMP_SCRIPT
        esiop_dump_script(sc);
#endif

        config_found(sc->sc_c.sc_dev, &sc->sc_c.sc_chan, scsiprint, CFARGS_NONE);
}

void
esiop_reset(struct esiop_softc *sc)
{
        int i, j;
        uint32_t addr;
        uint32_t msgin_addr, sem_addr;

        siop_common_reset(&sc->sc_c);

        /*
         * we copy the script at the beginning of RAM. Then there is 4 bytes
         * for messages in, and 4 bytes for semaphore
         */
        sc->sc_free_offset = __arraycount(esiop_script);
        msgin_addr =
            sc->sc_free_offset * sizeof(uint32_t) + sc->sc_c.sc_scriptaddr;
        sc->sc_free_offset += 1;
        sc->sc_semoffset = sc->sc_free_offset;
        sem_addr =
            sc->sc_semoffset * sizeof(uint32_t) + sc->sc_c.sc_scriptaddr;
        sc->sc_free_offset += 1;
        /* then we have the scheduler ring */
        sc->sc_shedoffset = sc->sc_free_offset;
        sc->sc_free_offset += A_ncmd_slots * CMD_SLOTSIZE;
        /* then the targets DSA table */
        sc->sc_target_table_offset = sc->sc_free_offset;
        sc->sc_free_offset += sc->sc_c.sc_chan.chan_ntargets;
        /* copy and patch the script */
        if (sc->sc_c.features & SF_CHIP_RAM) {
                bus_space_write_region_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh, 0,
                    esiop_script,
                    __arraycount(esiop_script));
                for (j = 0; j < __arraycount(E_tlq_offset_Used); j++) {
                        bus_space_write_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh,
                            E_tlq_offset_Used[j] * 4,
                            sizeof(struct siop_common_xfer));
                }
                for (j = 0; j < __arraycount(E_saved_offset_offset_Used); j++) {
                        bus_space_write_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh,
                            E_saved_offset_offset_Used[j] * 4,
                            sizeof(struct siop_common_xfer) + 4);
                }
                for (j = 0; j < __arraycount(E_abs_msgin2_Used); j++) {
                        bus_space_write_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh,
                            E_abs_msgin2_Used[j] * 4, msgin_addr);
                }
                for (j = 0; j < __arraycount(E_abs_sem_Used); j++) {
                        bus_space_write_4(sc->sc_c.sc_ramt, sc->sc_c.sc_ramh,
                            E_abs_sem_Used[j] * 4, sem_addr);
                }

                if (sc->sc_c.features & SF_CHIP_LED0) {
                        bus_space_write_region_4(sc->sc_c.sc_ramt,
                            sc->sc_c.sc_ramh,
                            Ent_led_on1, esiop_led_on,
                            __arraycount(esiop_led_on));
                        bus_space_write_region_4(sc->sc_c.sc_ramt,
                            sc->sc_c.sc_ramh,
                            Ent_led_on2, esiop_led_on,
                            __arraycount(esiop_led_on));
                        bus_space_write_region_4(sc->sc_c.sc_ramt,
                            sc->sc_c.sc_ramh,
                            Ent_led_off, esiop_led_off,
                            __arraycount(esiop_led_off));
                }
        } else {
                for (j = 0; j < __arraycount(esiop_script); j++) {
                        sc->sc_c.sc_script[j] = htole32(esiop_script[j]);
                }
                for (j = 0; j < __arraycount(E_tlq_offset_Used); j++) {
                        sc->sc_c.sc_script[E_tlq_offset_Used[j]] =
                            htole32(sizeof(struct siop_common_xfer));
                }
                for (j = 0; j < __arraycount(E_saved_offset_offset_Used); j++) {
                        sc->sc_c.sc_script[E_saved_offset_offset_Used[j]] =
                            htole32(sizeof(struct siop_common_xfer) + 4);
                }
                for (j = 0; j < __arraycount(E_abs_msgin2_Used); j++) {
                        sc->sc_c.sc_script[E_abs_msgin2_Used[j]] =
                            htole32(msgin_addr);
                }
                for (j = 0; j < __arraycount(E_abs_sem_Used); j++) {
                        sc->sc_c.sc_script[E_abs_sem_Used[j]] =
                            htole32(sem_addr);
                }

                if (sc->sc_c.features & SF_CHIP_LED0) {
                        for (j = 0; j < __arraycount(esiop_led_on); j++)
                                sc->sc_c.sc_script[
                                    Ent_led_on1 / sizeof(esiop_led_on[0]) + j
                                    ] = htole32(esiop_led_on[j]);
                        for (j = 0; j < __arraycount(esiop_led_on); j++)
                                sc->sc_c.sc_script[
                                    Ent_led_on2 / sizeof(esiop_led_on[0]) + j
                                    ] = htole32(esiop_led_on[j]);
                        for (j = 0; j < __arraycount(esiop_led_off); j++)
                                sc->sc_c.sc_script[
                                    Ent_led_off / sizeof(esiop_led_off[0]) + j
                                    ] = htole32(esiop_led_off[j]);
                }
        }
        /* get base of scheduler ring */
        addr = sc->sc_c.sc_scriptaddr + sc->sc_shedoffset * sizeof(uint32_t);
        /* init scheduler */
        for (i = 0; i < A_ncmd_slots; i++) {
                esiop_script_write(sc,
                    sc->sc_shedoffset + i * CMD_SLOTSIZE, A_f_cmd_free);
        }
        sc->sc_currschedslot = 0;
        bus_space_write_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_SCRATCHE, 0);
        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_SCRATCHD, addr);
        /*
         * 0x78000000 is a 'move data8 to reg'. data8 is the second
         * octet, reg offset is the third.
         */
        esiop_script_write(sc, Ent_cmdr0 / 4,
            0x78640000 | ((addr & 0x000000ff) <<  8));
        esiop_script_write(sc, Ent_cmdr1 / 4,
            0x78650000 | ((addr & 0x0000ff00)      ));
        esiop_script_write(sc, Ent_cmdr2 / 4,
            0x78660000 | ((addr & 0x00ff0000) >>  8));
        esiop_script_write(sc, Ent_cmdr3 / 4,
            0x78670000 | ((addr & 0xff000000) >> 16));
        /* done ring */
        for (i = 0; i < A_ndone_slots; i++)
                sc->sc_done_slot[i] = 0;
        bus_dmamap_sync(sc->sc_c.sc_dmat, sc->sc_done_map,
            sc->sc_done_offset, A_ndone_slots * sizeof(uint32_t),
            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
        addr = sc->sc_done_map->dm_segs[0].ds_addr + sc->sc_done_offset;
        sc->sc_currdoneslot = 0;
        bus_space_write_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_SCRATCHE + 2, 0);
        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_SCRATCHF, addr);
        esiop_script_write(sc, Ent_doner0 / 4,
            0x786c0000 | ((addr & 0x000000ff) <<  8));
        esiop_script_write(sc, Ent_doner1 / 4,
            0x786d0000 | ((addr & 0x0000ff00)      ));
        esiop_script_write(sc, Ent_doner2 / 4,
            0x786e0000 | ((addr & 0x00ff0000) >>  8));
        esiop_script_write(sc, Ent_doner3 / 4,
            0x786f0000 | ((addr & 0xff000000) >> 16));

        /* set flags */
        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_SCRATCHC, 0);
        /* write pointer of base of target DSA table */
        addr = (sc->sc_target_table_offset * sizeof(uint32_t)) +
            sc->sc_c.sc_scriptaddr;
        esiop_script_write(sc, (Ent_load_targtable / 4) + 0,
            esiop_script_read(sc,(Ent_load_targtable / 4) + 0) |
            ((addr & 0x000000ff) <<  8));
        esiop_script_write(sc, (Ent_load_targtable / 4) + 2,
            esiop_script_read(sc,(Ent_load_targtable / 4) + 2) |
            ((addr & 0x0000ff00)      ));
        esiop_script_write(sc, (Ent_load_targtable / 4) + 4,
            esiop_script_read(sc,(Ent_load_targtable / 4) + 4) |
            ((addr & 0x00ff0000) >>  8));
        esiop_script_write(sc, (Ent_load_targtable / 4) + 6,
            esiop_script_read(sc,(Ent_load_targtable / 4) + 6) |
            ((addr & 0xff000000) >> 16));
#ifdef SIOP_DEBUG
        printf("%s: target table offset %d free offset %d\n",
            device_xname(sc->sc_c.sc_dev), sc->sc_target_table_offset,
            sc->sc_free_offset);
#endif

        /* register existing targets */
        for (i = 0; i < sc->sc_c.sc_chan.chan_ntargets; i++) {
                if (sc->sc_c.targets[i])
                        esiop_target_register(sc, i);
        }
        /* start script */
        if ((sc->sc_c.features & SF_CHIP_RAM) == 0) {
                bus_dmamap_sync(sc->sc_c.sc_dmat, sc->sc_c.sc_scriptdma, 0,
                    PAGE_SIZE, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
        }
        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSP,
            sc->sc_c.sc_scriptaddr + Ent_reselect);
}

#if 0
#define CALL_SCRIPT(ent) do {                                           \
        printf ("start script DSA 0x%lx DSP 0x%lx\n",                   \
            esiop_cmd->cmd_c.dsa,                                       \
            sc->sc_c.sc_scriptaddr + ent);                              \
        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,               \
            SIOP_DSP, sc->sc_c.sc_scriptaddr + ent);                    \
} while (/* CONSTCOND */0)
#else
#define CALL_SCRIPT(ent) do {                                           \
        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,               \
            SIOP_DSP, sc->sc_c.sc_scriptaddr + ent);                    \
} while (/* CONSTCOND */0)
#endif

int
esiop_intr(void *v)
{
        struct esiop_softc *sc = v;
        struct esiop_target *esiop_target;
        struct esiop_cmd *esiop_cmd;
        struct esiop_lun *esiop_lun;
        struct scsipi_xfer *xs;
        int istat, sist, sstat1, dstat = 0; /* XXX: gcc */
        uint32_t irqcode;
        int need_reset = 0;
        int offset, target, lun, tag;
        uint32_t tflags;
        uint32_t addr;
        int freetarget = 0;
        int slot;
        int retval = 0;

again:
        istat = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_ISTAT);
        if ((istat & (ISTAT_INTF | ISTAT_DIP | ISTAT_SIP)) == 0) {
                return retval;
        }
        retval = 1;
        INCSTAT(esiop_stat_intr);
        esiop_checkdone(sc);
        if (istat & ISTAT_INTF) {
                bus_space_write_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                    SIOP_ISTAT, ISTAT_INTF);
                goto again;
        }

        if ((istat &(ISTAT_DIP | ISTAT_SIP | ISTAT_ABRT)) ==
            (ISTAT_DIP | ISTAT_ABRT)) {
                /* clear abort */
                bus_space_write_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                    SIOP_ISTAT, 0);
        }

        /* get CMD from T/L/Q */
        tflags = bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
            SIOP_SCRATCHC);
#ifdef SIOP_DEBUG_INTR
                printf("interrupt, istat=0x%x tflags=0x%x "
                    "DSA=0x%x DSP=0x%lx\n", istat, tflags,
                    bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA),
                    (u_long)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                        SIOP_DSP) -
                    sc->sc_c.sc_scriptaddr));
#endif
        target = (tflags & A_f_c_target) ? ((tflags >> 8) & 0xff) : -1;
        if (target > sc->sc_c.sc_chan.chan_ntargets) target = -1;
        lun = (tflags & A_f_c_lun) ? ((tflags >> 16) & 0xff) : -1;
        if (lun > sc->sc_c.sc_chan.chan_nluns) lun = -1;
        tag = (tflags & A_f_c_tag) ? ((tflags >> 24) & 0xff) : -1;

        if (target >= 0 && lun >= 0) {
                esiop_target = (struct esiop_target *)sc->sc_c.targets[target];
                if (esiop_target == NULL) {
                        printf("esiop_target (target %d) not valid\n", target);
                        goto none;
                }
                esiop_lun = esiop_target->esiop_lun[lun];
                if (esiop_lun == NULL) {
                        printf("esiop_lun (target %d lun %d) not valid\n",
                            target, lun);
                        goto none;
                }
                esiop_cmd =
                    (tag >= 0) ? esiop_lun->tactive[tag] : esiop_lun->active;
                if (esiop_cmd == NULL) {
                        printf("esiop_cmd (target %d lun %d tag %d)"
                            " not valid\n",
                            target, lun, tag);
                        goto none;
                }
                xs = esiop_cmd->cmd_c.xs;
#ifdef DIAGNOSTIC
                if (esiop_cmd->cmd_c.status != CMDST_ACTIVE) {
                        printf("esiop_cmd (target %d lun %d) "
                            "not active (%d)\n", target, lun,
                            esiop_cmd->cmd_c.status);
                        goto none;
                }
#endif
                esiop_table_sync(esiop_cmd,
                    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
        } else {
none:
                xs = NULL;
                esiop_target = NULL;
                esiop_lun = NULL;
                esiop_cmd = NULL;
        }
        if (istat & ISTAT_DIP) {
                dstat = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                    SIOP_DSTAT);
                if (dstat & DSTAT_ABRT) {
                        /* was probably generated by a bus reset IOCTL */
                        if ((dstat & DSTAT_DFE) == 0)
                                siop_clearfifo(&sc->sc_c);
                        goto reset;
                }
                if (dstat & DSTAT_SSI) {
                        printf("single step dsp 0x%08x dsa 0x08%x\n",
                            (int)(bus_space_read_4(sc->sc_c.sc_rt,
                            sc->sc_c.sc_rh, SIOP_DSP) -
                            sc->sc_c.sc_scriptaddr),
                            bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                                SIOP_DSA));
                        if ((dstat & ~(DSTAT_DFE | DSTAT_SSI)) == 0 &&
                            (istat & ISTAT_SIP) == 0) {
                                bus_space_write_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_DCNTL,
                                    bus_space_read_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_DCNTL) | DCNTL_STD);
                        }
                        return 1;
                }

                if (dstat & ~(DSTAT_SIR | DSTAT_DFE | DSTAT_SSI)) {
                printf("%s: DMA IRQ:", device_xname(sc->sc_c.sc_dev));
                if (dstat & DSTAT_IID)
                        printf(" Illegal instruction");
                if (dstat & DSTAT_BF)
                        printf(" bus fault");
                if (dstat & DSTAT_MDPE)
                        printf(" parity");
                if (dstat & DSTAT_DFE)
                        printf(" DMA fifo empty");
                else
                        siop_clearfifo(&sc->sc_c);
                printf(", DSP=0x%x DSA=0x%x: ",
                    (int)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                        SIOP_DSP) - sc->sc_c.sc_scriptaddr),
                    bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA));
                if (esiop_cmd)
                        printf("T/L/Q=%d/%d/%d last msg_in=0x%x status=0x%x\n",
                            target, lun, tag, esiop_cmd->cmd_tables->msg_in[0],
                            le32toh(esiop_cmd->cmd_tables->status));
                else
                        printf(" current T/L/Q invalid\n");
                need_reset = 1;
                }
        }
        if (istat & ISTAT_SIP) {
                if (istat & ISTAT_DIP)
                        delay(10);
                /*
                 * Can't read sist0 & sist1 independently, or we have to
                 * insert delay
                 */
                sist = bus_space_read_2(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                    SIOP_SIST0);
                sstat1 = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                    SIOP_SSTAT1);
#ifdef SIOP_DEBUG_INTR
                printf("scsi interrupt, sist=0x%x sstat1=0x%x "
                    "DSA=0x%x DSP=0x%lx\n", sist, sstat1,
                    bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA),
                    (u_long)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                        SIOP_DSP) -
                    sc->sc_c.sc_scriptaddr));
#endif
                if (sist & SIST0_RST) {
                        esiop_handle_reset(sc);
                        /* no table to flush here */
                        return 1;
                }
                if (sist & SIST0_SGE) {
                        if (esiop_cmd)
                                scsipi_printaddr(xs->xs_periph);
                        else
                                printf("%s:", device_xname(sc->sc_c.sc_dev));
                        printf("scsi gross error\n");
                        if (esiop_target)
                                esiop_target->target_c.flags &= ~TARF_DT;
#ifdef SIOP_DEBUG
                        printf("DSA=0x%x DSP=0x%lx\n",
                            bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_DSA),
                            (u_long)(bus_space_read_4(sc->sc_c.sc_rt,
                                sc->sc_c.sc_rh, SIOP_DSP) -
                            sc->sc_c.sc_scriptaddr));
                        printf("SDID 0x%x SCNTL3 0x%x SXFER 0x%x SCNTL4 0x%x\n",
                            bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_SDID),
                            bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_SCNTL3),
                            bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_SXFER),
                            bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_SCNTL4));

#endif
                        goto reset;
                }
                if ((sist & SIST0_MA) && need_reset == 0) {
                        if (esiop_cmd) {
                                int scratchc0;
                                dstat = bus_space_read_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_DSTAT);
                                /*
                                 * first restore DSA, in case we were in a S/G
                                 * operation.
                                 */
                                bus_space_write_4(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh,
                                    SIOP_DSA, esiop_cmd->cmd_c.dsa);
                                scratchc0 = bus_space_read_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_SCRATCHC);
                                switch (sstat1 & SSTAT1_PHASE_MASK) {
                                case SSTAT1_PHASE_STATUS:
                                /*
                                 * previous phase may be aborted for any reason
                                 * ( for example, the target has less data to
                                 * transfer than requested). Compute resid and
                                 * just go to status, the command should
                                 * terminate.
                                 */
                                        INCSTAT(esiop_stat_intr_shortxfer);
                                        if (scratchc0 & A_f_c_data)
                                                siop_ma(&esiop_cmd->cmd_c);
                                        else if ((dstat & DSTAT_DFE) == 0)
                                                siop_clearfifo(&sc->sc_c);
                                        CALL_SCRIPT(Ent_status);
                                        return 1;
                                case SSTAT1_PHASE_MSGIN:
                                /*
                                 * target may be ready to disconnect
                                 * Compute resid which would be used later
                                 * if a save data pointer is needed.
                                 */
                                        INCSTAT(esiop_stat_intr_xferdisc);
                                        if (scratchc0 & A_f_c_data)
                                                siop_ma(&esiop_cmd->cmd_c);
                                        else if ((dstat & DSTAT_DFE) == 0)
                                                siop_clearfifo(&sc->sc_c);
                                        bus_space_write_1(sc->sc_c.sc_rt,
                                            sc->sc_c.sc_rh, SIOP_SCRATCHC,
                                            scratchc0 & ~A_f_c_data);
                                        CALL_SCRIPT(Ent_msgin);
                                        return 1;
                                }
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "unexpected phase mismatch %d\n",
                                    sstat1 & SSTAT1_PHASE_MASK);
                        } else {
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "phase mismatch without command\n");
                        }
                        need_reset = 1;
                }
                if (sist & SIST0_PAR) {
                        /* parity error, reset */
                        if (esiop_cmd)
                                scsipi_printaddr(xs->xs_periph);
                        else
                                printf("%s:", device_xname(sc->sc_c.sc_dev));
                        printf("parity error\n");
                        if (esiop_target)
                                esiop_target->target_c.flags &= ~TARF_DT;
                        goto reset;
                }
                if ((sist & (SIST1_STO << 8)) && need_reset == 0) {
                        /*
                         * selection time out, assume there's no device here
                         * We also have to update the ring pointer ourselves
                         */
                        slot = bus_space_read_1(sc->sc_c.sc_rt,
                            sc->sc_c.sc_rh, SIOP_SCRATCHE);
                        esiop_script_sync(sc,
                            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
#ifdef SIOP_DEBUG_SCHED
                        printf("sel timeout target %d, slot %d\n",
                            target, slot);
#endif
                        /*
                         * mark this slot as free, and advance to next slot
                         */
                        esiop_script_write(sc,
                            sc->sc_shedoffset + slot * CMD_SLOTSIZE,
                            A_f_cmd_free);
                        addr = bus_space_read_4(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_SCRATCHD);
                        if (slot < (A_ncmd_slots - 1)) {
                                bus_space_write_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_SCRATCHE, slot + 1);
                                addr = addr + sizeof(struct esiop_slot);
                        } else {
                                bus_space_write_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_SCRATCHE, 0);
                                addr = sc->sc_c.sc_scriptaddr +
                                    sc->sc_shedoffset * sizeof(uint32_t);
                        }
                        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_SCRATCHD, addr);
                        esiop_script_sync(sc,
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                        if (esiop_cmd) {
                                esiop_cmd->cmd_c.status = CMDST_DONE;
                                xs->error = XS_SELTIMEOUT;
                                freetarget = 1;
                                goto end;
                        } else {
                                printf("%s: selection timeout without "
                                    "command, target %d (sdid 0x%x), "
                                    "slot %d\n",
                                    device_xname(sc->sc_c.sc_dev), target,
                                    bus_space_read_1(sc->sc_c.sc_rt,
                                    sc->sc_c.sc_rh, SIOP_SDID), slot);
                                need_reset = 1;
                        }
                }
                if (sist & SIST0_UDC) {
                        /*
                         * unexpected disconnect. Usually the target signals
                         * a fatal condition this way. Attempt to get sense.
                         */
                         if (esiop_cmd) {
                                esiop_cmd->cmd_tables->status =
                                    htole32(SCSI_CHECK);
                                goto end;
                        }
                        aprint_error_dev(sc->sc_c.sc_dev,
                            "unexpected disconnect without command\n");
                        goto reset;
                }
                if (sist & (SIST1_SBMC << 8)) {
                        /* SCSI bus mode change */
                        if (siop_modechange(&sc->sc_c) == 0 || need_reset == 1)
                                goto reset;
                        if ((istat & ISTAT_DIP) && (dstat & DSTAT_SIR)) {
                                /*
                                 * we have a script interrupt, it will
                                 * restart the script.
                                 */
                                goto scintr;
                        }
                        /*
                         * else we have to restart it ourselves, at the
                         * interrupted instruction.
                         */
                        bus_space_write_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_DSP,
                            bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                            SIOP_DSP) - 8);
                        return 1;
                }
                /* Else it's an unhandled exception (for now). */
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unhandled scsi interrupt, sist=0x%x sstat1=0x%x "
                    "DSA=0x%x DSP=0x%x\n", sist,
                    bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                        SIOP_SSTAT1),
                    bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA),
                    (int)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                        SIOP_DSP) - sc->sc_c.sc_scriptaddr));
                if (esiop_cmd) {
                        esiop_cmd->cmd_c.status = CMDST_DONE;
                        xs->error = XS_SELTIMEOUT;
                        goto end;
                }
                need_reset = 1;
        }
        if (need_reset) {
reset:
                /* fatal error, reset the bus */
                siop_resetbus(&sc->sc_c);
                /* no table to flush here */
                return 1;
        }

scintr:
        if ((istat & ISTAT_DIP) && (dstat & DSTAT_SIR)) { /* script interrupt */
                irqcode = bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
                    SIOP_DSPS);
#ifdef SIOP_DEBUG_INTR
                printf("script interrupt 0x%x\n", irqcode);
#endif
                /*
                 * no command, or an inactive command is only valid for a
                 * reselect interrupt
                 */
                if ((irqcode & 0x80) == 0) {
                        if (esiop_cmd == NULL) {
                                aprint_error_dev(sc->sc_c.sc_dev,
                        "script interrupt (0x%x) with invalid DSA !!!\n",
                                    irqcode);
                                goto reset;
                        }
                        if (esiop_cmd->cmd_c.status != CMDST_ACTIVE) {
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "command with invalid status "
                                    "(IRQ code 0x%x current status %d) !\n",
                                    irqcode, esiop_cmd->cmd_c.status);
                                xs = NULL;
                        }
                }
                switch(irqcode) {
                case A_int_err:
                        printf("error, DSP=0x%x\n",
                            (int)(bus_space_read_4(sc->sc_c.sc_rt,
                            sc->sc_c.sc_rh, SIOP_DSP) -
                            sc->sc_c.sc_scriptaddr));
                        if (xs) {
                                xs->error = XS_SELTIMEOUT;
                                goto end;
                        } else {
                                goto reset;
                        }
                case A_int_msgin:
                {
                        int msgin = bus_space_read_1(sc->sc_c.sc_rt,
                            sc->sc_c.sc_rh, SIOP_SFBR);
                        if (msgin == MSG_MESSAGE_REJECT) {
                                int msg, extmsg;
                                if (esiop_cmd->cmd_tables->msg_out[0] & 0x80) {
                                        /*
                                         * message was part of a identify +
                                         * something else. Identify shouldn't
                                         * have been rejected.
                                         */
                                        msg =
                                            esiop_cmd->cmd_tables->msg_out[1];
                                        extmsg =
                                            esiop_cmd->cmd_tables->msg_out[3];
                                } else {
                                        msg =
                                            esiop_cmd->cmd_tables->msg_out[0];
                                        extmsg =
                                            esiop_cmd->cmd_tables->msg_out[2];
                                }
                                if (msg == MSG_MESSAGE_REJECT) {
                                        /* MSG_REJECT  for a MSG_REJECT  !*/
                                        if (xs)
                                                scsipi_printaddr(xs->xs_periph);
                                        else
                                                printf("%s: ", device_xname(
                                                    sc->sc_c.sc_dev));
                                        printf("our reject message was "
                                            "rejected\n");
                                        goto reset;
                                }
                                if (msg == MSG_EXTENDED &&
                                    extmsg == MSG_EXT_WDTR) {
                                        /* WDTR rejected, initiate sync */
                                        if ((esiop_target->target_c.flags &
                                           TARF_SYNC) == 0) {
                                                esiop_target->target_c.status =
                                                    TARST_OK;
                                                siop_update_xfer_mode(&sc->sc_c,
                                                    target);
                                                /* no table to flush here */
                                                CALL_SCRIPT(Ent_msgin_ack);
                                                return 1;
                                        }
                                        esiop_target->target_c.status =
                                            TARST_SYNC_NEG;
                                        siop_sdtr_msg(&esiop_cmd->cmd_c, 0,
                                            sc->sc_c.st_minsync,
                                            sc->sc_c.maxoff);
                                        esiop_table_sync(esiop_cmd,
                                            BUS_DMASYNC_PREREAD |
                                            BUS_DMASYNC_PREWRITE);
                                        CALL_SCRIPT(Ent_send_msgout);
                                        return 1;
                                } else if (msg == MSG_EXTENDED &&
                                    extmsg == MSG_EXT_SDTR) {
                                        /* sync rejected */
                                        esiop_target->target_c.offset = 0;
                                        esiop_target->target_c.period = 0;
                                        esiop_target->target_c.status =
                                            TARST_OK;
                                        siop_update_xfer_mode(&sc->sc_c,
                                            target);
                                        /* no table to flush here */
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                } else if (msg == MSG_EXTENDED &&
                                    extmsg == MSG_EXT_PPR) {
                                        /* PPR rejected */
                                        esiop_target->target_c.offset = 0;
                                        esiop_target->target_c.period = 0;
                                        esiop_target->target_c.status =
                                            TARST_OK;
                                        siop_update_xfer_mode(&sc->sc_c,
                                            target);
                                        /* no table to flush here */
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                } else if (msg == MSG_SIMPLE_Q_TAG ||
                                    msg == MSG_HEAD_OF_Q_TAG ||
                                    msg == MSG_ORDERED_Q_TAG) {
                                        if (esiop_handle_qtag_reject(
                                            esiop_cmd) == -1)
                                                goto reset;
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                }
                                if (xs)
                                        scsipi_printaddr(xs->xs_periph);
                                else
                                        printf("%s: ",
                                            device_xname(sc->sc_c.sc_dev));
                                if (msg == MSG_EXTENDED) {
                                        printf("scsi message reject, extended "
                                            "message sent was 0x%x\n", extmsg);
                                } else {
                                        printf("scsi message reject, message "
                                            "sent was 0x%x\n", msg);
                                }
                                /* no table to flush here */
                                CALL_SCRIPT(Ent_msgin_ack);
                                return 1;
                        }
                        if (msgin == MSG_IGN_WIDE_RESIDUE) {
                        /* use the extmsgdata table to get the second byte */
                                esiop_cmd->cmd_tables->t_extmsgdata.count =
                                    htole32(1);
                                esiop_table_sync(esiop_cmd,
                                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                                CALL_SCRIPT(Ent_get_extmsgdata);
                                return 1;
                        }
                        if (xs)
                                scsipi_printaddr(xs->xs_periph);
                        else
                                printf("%s: ", device_xname(sc->sc_c.sc_dev));
                        printf("unhandled message 0x%x\n", msgin);
                        esiop_cmd->cmd_tables->msg_out[0] = MSG_MESSAGE_REJECT;
                        esiop_cmd->cmd_tables->t_msgout.count= htole32(1);
                        esiop_table_sync(esiop_cmd,
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                        CALL_SCRIPT(Ent_send_msgout);
                        return 1;
                }
                case A_int_extmsgin:
#ifdef SIOP_DEBUG_INTR
                        printf("extended message: msg 0x%x len %d\n",
                            esiop_cmd->cmd_tables->msg_in[2],
                            esiop_cmd->cmd_tables->msg_in[1]);
#endif
                        if (esiop_cmd->cmd_tables->msg_in[1] >
                            sizeof(esiop_cmd->cmd_tables->msg_in) - 2)
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "extended message too big (%d)\n",
                                    esiop_cmd->cmd_tables->msg_in[1]);
                        esiop_cmd->cmd_tables->t_extmsgdata.count =
                            htole32(esiop_cmd->cmd_tables->msg_in[1] - 1);
                        esiop_table_sync(esiop_cmd,
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                        CALL_SCRIPT(Ent_get_extmsgdata);
                        return 1;
                case A_int_extmsgdata:
#ifdef SIOP_DEBUG_INTR
                        {
                        int i;
                        printf("extended message: 0x%x, data:",
                            esiop_cmd->cmd_tables->msg_in[2]);
                        for (i = 3; i < 2 + esiop_cmd->cmd_tables->msg_in[1];
                            i++)
                                printf(" 0x%x",
                                    esiop_cmd->cmd_tables->msg_in[i]);
                        printf("\n");
                        }
#endif
                        if (esiop_cmd->cmd_tables->msg_in[0] ==
                            MSG_IGN_WIDE_RESIDUE) {
                        /* we got the second byte of MSG_IGN_WIDE_RESIDUE */
                                if (esiop_cmd->cmd_tables->msg_in[3] != 1)
                                        printf("MSG_IGN_WIDE_RESIDUE: "
                                             "bad len %d\n",
                                             esiop_cmd->cmd_tables->msg_in[3]);
                                switch (siop_iwr(&esiop_cmd->cmd_c)) {
                                case SIOP_NEG_MSGOUT:
                                        esiop_table_sync(esiop_cmd,
                                            BUS_DMASYNC_PREREAD |
                                            BUS_DMASYNC_PREWRITE);
                                        CALL_SCRIPT(Ent_send_msgout);
                                        return 1;
                                case SIOP_NEG_ACK:
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                default:
                                        panic("invalid retval from "
                                            "siop_iwr()");
                                }
                                return 1;
                        }
                        if (esiop_cmd->cmd_tables->msg_in[2] == MSG_EXT_PPR) {
                                switch (siop_ppr_neg(&esiop_cmd->cmd_c)) {
                                case SIOP_NEG_MSGOUT:
                                        esiop_update_scntl3(sc,
                                            esiop_cmd->cmd_c.siop_target);
                                        esiop_table_sync(esiop_cmd,
                                            BUS_DMASYNC_PREREAD |
                                            BUS_DMASYNC_PREWRITE);
                                        CALL_SCRIPT(Ent_send_msgout);
                                        return 1;
                                case SIOP_NEG_ACK:
                                        esiop_update_scntl3(sc,
                                            esiop_cmd->cmd_c.siop_target);
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                default:
                                        panic("invalid retval from "
                                            "siop_ppr_neg()");
                                }
                                return 1;
                        }
                        if (esiop_cmd->cmd_tables->msg_in[2] == MSG_EXT_WDTR) {
                                switch (siop_wdtr_neg(&esiop_cmd->cmd_c)) {
                                case SIOP_NEG_MSGOUT:
                                        esiop_update_scntl3(sc,
                                            esiop_cmd->cmd_c.siop_target);
                                        esiop_table_sync(esiop_cmd,
                                            BUS_DMASYNC_PREREAD |
                                            BUS_DMASYNC_PREWRITE);
                                        CALL_SCRIPT(Ent_send_msgout);
                                        return 1;
                                case SIOP_NEG_ACK:
                                        esiop_update_scntl3(sc,
                                            esiop_cmd->cmd_c.siop_target);
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                default:
                                        panic("invalid retval from "
                                            "siop_wdtr_neg()");
                                }
                                return 1;
                        }
                        if (esiop_cmd->cmd_tables->msg_in[2] == MSG_EXT_SDTR) {
                                switch (siop_sdtr_neg(&esiop_cmd->cmd_c)) {
                                case SIOP_NEG_MSGOUT:
                                        esiop_update_scntl3(sc,
                                            esiop_cmd->cmd_c.siop_target);
                                        esiop_table_sync(esiop_cmd,
                                            BUS_DMASYNC_PREREAD |
                                            BUS_DMASYNC_PREWRITE);
                                        CALL_SCRIPT(Ent_send_msgout);
                                        return 1;
                                case SIOP_NEG_ACK:
                                        esiop_update_scntl3(sc,
                                            esiop_cmd->cmd_c.siop_target);
                                        CALL_SCRIPT(Ent_msgin_ack);
                                        return 1;
                                default:
                                        panic("invalid retval from "
                                            "siop_sdtr_neg()");
                                }
                                return 1;
                        }
                        /* send a message reject */
                        esiop_cmd->cmd_tables->msg_out[0] = MSG_MESSAGE_REJECT;
                        esiop_cmd->cmd_tables->t_msgout.count = htole32(1);
                        esiop_table_sync(esiop_cmd,
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                        CALL_SCRIPT(Ent_send_msgout);
                        return 1;
                case A_int_disc:
                        INCSTAT(esiop_stat_intr_sdp);
                        offset = bus_space_read_1(sc->sc_c.sc_rt,
                            sc->sc_c.sc_rh, SIOP_SCRATCHA + 1);
#ifdef SIOP_DEBUG_DR
                        printf("disconnect offset %d\n", offset);
#endif
                        siop_sdp(&esiop_cmd->cmd_c, offset);
                        /* we start again with no offset */
                        ESIOP_XFER(esiop_cmd, saved_offset) =
                            htole32(SIOP_NOOFFSET);
                        esiop_table_sync(esiop_cmd,
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                        CALL_SCRIPT(Ent_script_sched);
                        return 1;
                case A_int_resfail:
                        printf("reselect failed\n");
                        CALL_SCRIPT(Ent_script_sched);
                        return 1;
                case A_int_done:
                        if (xs == NULL) {
                                printf("%s: done without command\n",
                                    device_xname(sc->sc_c.sc_dev));
                                CALL_SCRIPT(Ent_script_sched);
                                return 1;
                        }
#ifdef SIOP_DEBUG_INTR
                        printf("done, DSA=0x%lx target id 0x%x last msg "
                            "in=0x%x status=0x%x\n",
                            (u_long)esiop_cmd->cmd_c.dsa,
                            le32toh(esiop_cmd->cmd_tables->id),
                            esiop_cmd->cmd_tables->msg_in[0],
                            le32toh(esiop_cmd->cmd_tables->status));
#endif
                        INCSTAT(esiop_stat_intr_done);
                        esiop_cmd->cmd_c.status = CMDST_DONE;
                        goto end;
                default:
                        printf("unknown irqcode %x\n", irqcode);
                        if (xs) {
                                xs->error = XS_SELTIMEOUT;
                                goto end;
                        }
                        goto reset;
                }
                return 1;
        }
        /*
         * We just shouldn't get there, but on some KVM virtual hosts,
         * we do - see PR 48277.
         */
        printf("esiop_intr: I shouldn't be there !\n");
        return 1;

end:
        /*
         * restart the script now if command completed properly
         * Otherwise wait for siop_scsicmd_end(), we may need to cleanup the
         * queue
         */
        xs->status = le32toh(esiop_cmd->cmd_tables->status);
#ifdef SIOP_DEBUG_INTR
        printf("esiop_intr end: status %d\n", xs->status);
#endif
        if (tag >= 0)
                esiop_lun->tactive[tag] = NULL;
        else
                esiop_lun->active = NULL;
        offset = bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
            SIOP_SCRATCHA + 1);
        /*
         * if we got a disconnect between the last data phase
         * and the status phase, offset will be 0. In this
         * case, cmd_tables->saved_offset will have the proper value
         * if it got updated by the controller
         */
        if (offset == 0 &&
            ESIOP_XFER(esiop_cmd, saved_offset) != htole32(SIOP_NOOFFSET))
                offset =
                    (le32toh(ESIOP_XFER(esiop_cmd, saved_offset)) >> 8) & 0xff;

        esiop_scsicmd_end(esiop_cmd, offset);
        if (freetarget && esiop_target->target_c.status == TARST_PROBING)
                esiop_del_dev(sc, target, lun);
        CALL_SCRIPT(Ent_script_sched);
        return 1;
}

void
esiop_scsicmd_end(struct esiop_cmd *esiop_cmd, int offset)
{
        struct scsipi_xfer *xs = esiop_cmd->cmd_c.xs;
        struct esiop_softc *sc = (struct esiop_softc *)esiop_cmd->cmd_c.siop_sc;

        siop_update_resid(&esiop_cmd->cmd_c, offset);

        switch(xs->status) {
        case SCSI_OK:
                xs->error = XS_NOERROR;
                break;
        case SCSI_BUSY:
                xs->error = XS_BUSY;
                break;
        case SCSI_CHECK:
                xs->error = XS_BUSY;
                /* remove commands in the queue and scheduler */
                esiop_unqueue(sc, xs->xs_periph->periph_target,
                    xs->xs_periph->periph_lun);
                break;
        case SCSI_QUEUE_FULL:
                INCSTAT(esiop_stat_intr_qfull);
#ifdef SIOP_DEBUG
                printf("%s:%d:%d: queue full (tag %d)\n",
                    device_xname(sc->sc_c.sc_dev),
                    xs->xs_periph->periph_target,
                    xs->xs_periph->periph_lun, esiop_cmd->cmd_c.tag);
#endif
                xs->error = XS_BUSY;
                break;
        case SCSI_SIOP_NOCHECK:
                /*
                 * don't check status, xs->error is already valid
                 */
                break;
        case SCSI_SIOP_NOSTATUS:
                /*
                 * the status byte was not updated, cmd was
                 * aborted
                 */
                xs->error = XS_SELTIMEOUT;
                break;
        default:
                scsipi_printaddr(xs->xs_periph);
                printf("invalid status code %d\n", xs->status);
                xs->error = XS_DRIVER_STUFFUP;
        }
        if (xs->xs_control & (XS_CTL_DATA_IN | XS_CTL_DATA_OUT)) {
                bus_dmamap_sync(sc->sc_c.sc_dmat,
                    esiop_cmd->cmd_c.dmamap_data, 0,
                    esiop_cmd->cmd_c.dmamap_data->dm_mapsize,
                    (xs->xs_control & XS_CTL_DATA_IN) ?
                    BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_c.sc_dmat,
                    esiop_cmd->cmd_c.dmamap_data);
        }
        bus_dmamap_unload(sc->sc_c.sc_dmat, esiop_cmd->cmd_c.dmamap_cmd);
        if ((xs->xs_control & XS_CTL_POLL) == 0)
                callout_stop(&xs->xs_callout);
        esiop_cmd->cmd_c.status = CMDST_FREE;
        TAILQ_INSERT_TAIL(&sc->free_list, esiop_cmd, next);
#if 0
        if (xs->resid != 0)
                printf("resid %d datalen %d\n", xs->resid, xs->datalen);
#endif
        scsipi_done (xs);
}

void
esiop_checkdone(struct esiop_softc *sc)
{
        int target, lun, tag;
        struct esiop_target *esiop_target;
        struct esiop_lun *esiop_lun;
        struct esiop_cmd *esiop_cmd;
        uint32_t slot;
        int needsync = 0;
        int status;
        uint32_t sem, offset;

        esiop_script_sync(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
        sem = esiop_script_read(sc, sc->sc_semoffset);
        esiop_script_write(sc, sc->sc_semoffset, sem & ~A_sem_done);
        if ((sc->sc_flags & SCF_CHAN_NOSLOT) && (sem & A_sem_start)) {
                /*
                 * at last one command have been started,
                 * so we should have free slots now
                 */
                sc->sc_flags &= ~SCF_CHAN_NOSLOT;
                scsipi_channel_thaw(&sc->sc_c.sc_chan, 1);
        }
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

        if ((sem & A_sem_done) == 0) {
                /* no pending done command */
                return;
        }

        bus_dmamap_sync(sc->sc_c.sc_dmat, sc->sc_done_map,
            sc->sc_done_offset, A_ndone_slots * sizeof(uint32_t),
            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
next:
        if (sc->sc_done_slot[sc->sc_currdoneslot] == 0) {
                if (needsync)
                        bus_dmamap_sync(sc->sc_c.sc_dmat, sc->sc_done_map,
                            sc->sc_done_offset,
                            A_ndone_slots * sizeof(uint32_t),
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                return;
        }

        needsync = 1;

        slot = htole32(sc->sc_done_slot[sc->sc_currdoneslot]);
        sc->sc_done_slot[sc->sc_currdoneslot] = 0;
        sc->sc_currdoneslot += 1;
        if (sc->sc_currdoneslot == A_ndone_slots)
                sc->sc_currdoneslot = 0;

        target =  (slot & A_f_c_target) ? (slot >> 8) & 0xff : -1;
        lun =  (slot & A_f_c_lun) ? (slot >> 16) & 0xff : -1;
        tag =  (slot & A_f_c_tag) ? (slot >> 24) & 0xff : -1;

        esiop_target = (target >= 0) ?
            (struct esiop_target *)sc->sc_c.targets[target] : NULL;
        if (esiop_target == NULL) {
                printf("esiop_target (target %d) not valid\n", target);
                goto next;
        }
        esiop_lun = (lun >= 0) ? esiop_target->esiop_lun[lun] : NULL;
        if (esiop_lun == NULL) {
                printf("esiop_lun (target %d lun %d) not valid\n",
                    target, lun);
                goto next;
        }
        esiop_cmd = (tag >= 0) ? esiop_lun->tactive[tag] : esiop_lun->active;
        if (esiop_cmd == NULL) {
                printf("esiop_cmd (target %d lun %d tag %d) not valid\n",
                    target, lun, tag);
                        goto next;
        }

        esiop_table_sync(esiop_cmd,
            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
        status = le32toh(esiop_cmd->cmd_tables->status);
#ifdef DIAGNOSTIC
        if (status != SCSI_OK) {
                printf("command for T/L/Q %d/%d/%d status %d\n",
                    target, lun, tag, status);
                goto next;
        }

#endif
        /* Ok, this command has been handled */
        esiop_cmd->cmd_c.xs->status = status;
        if (tag >= 0)
                esiop_lun->tactive[tag] = NULL;
        else
                esiop_lun->active = NULL;
        /*
         * scratcha was eventually saved in saved_offset by script.
         * fetch offset from it
         */
        offset = 0;
        if (ESIOP_XFER(esiop_cmd, saved_offset) != htole32(SIOP_NOOFFSET))
                offset =
                    (le32toh(ESIOP_XFER(esiop_cmd, saved_offset)) >> 8) & 0xff;
        esiop_scsicmd_end(esiop_cmd, offset);
        goto next;
}

void
esiop_unqueue(struct esiop_softc *sc, int target, int lun)
{
        int slot, tag;
        uint32_t slotdsa;
        struct esiop_cmd *esiop_cmd;
        struct esiop_lun *esiop_lun =
            ((struct esiop_target *)sc->sc_c.targets[target])->esiop_lun[lun];

        /* first make sure to read valid data */
        esiop_script_sync(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);

        for (tag = 0; tag < ESIOP_NTAG; tag++) {
                /* look for commands in the scheduler, not yet started */
                if (esiop_lun->tactive[tag] == NULL)
                        continue;
                esiop_cmd = esiop_lun->tactive[tag];
                for (slot = 0; slot < A_ncmd_slots; slot++) {
                        slotdsa = esiop_script_read(sc,
                            sc->sc_shedoffset + slot * CMD_SLOTSIZE);
                        /* if the slot has any flag, it won't match the DSA */
                        if (slotdsa == esiop_cmd->cmd_c.dsa) { /* found it */
                                /* Mark this slot as ignore */
                                esiop_script_write(sc,
                                    sc->sc_shedoffset + slot * CMD_SLOTSIZE,
                                    esiop_cmd->cmd_c.dsa | A_f_cmd_ignore);
                                /* ask to requeue */
                                esiop_cmd->cmd_c.xs->error = XS_REQUEUE;
                                esiop_cmd->cmd_c.xs->status = SCSI_SIOP_NOCHECK;
                                esiop_lun->tactive[tag] = NULL;
                                esiop_scsicmd_end(esiop_cmd, 0);
                                break;
                        }
                }
        }
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}

/*
 * handle a rejected queue tag message: the command will run untagged,
 * has to adjust the reselect script.
 */


int
esiop_handle_qtag_reject(struct esiop_cmd *esiop_cmd)
{
        struct esiop_softc *sc = (struct esiop_softc *)esiop_cmd->cmd_c.siop_sc;
        int target = esiop_cmd->cmd_c.xs->xs_periph->periph_target;
        int lun = esiop_cmd->cmd_c.xs->xs_periph->periph_lun;
        int tag = esiop_cmd->cmd_tables->msg_out[2];
        struct esiop_target *esiop_target =
            (struct esiop_target*)sc->sc_c.targets[target];
        struct esiop_lun *esiop_lun = esiop_target->esiop_lun[lun];

#ifdef SIOP_DEBUG
        printf("%s:%d:%d: tag message %d (%d) rejected (status %d)\n",
            device_xname(sc->sc_c.sc_dev), target, lun, tag,
            esiop_cmd->cmd_c.tag, esiop_cmd->cmd_c.status);
#endif

        if (esiop_lun->active != NULL) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "untagged command already running for target %d "
                    "lun %d (status %d)\n",
                    target, lun, esiop_lun->active->cmd_c.status);
                return -1;
        }
        /* clear tag slot */
        esiop_lun->tactive[tag] = NULL;
        /* add command to non-tagged slot */
        esiop_lun->active = esiop_cmd;
        esiop_cmd->cmd_c.flags &= ~CMDFL_TAG;
        esiop_cmd->cmd_c.tag = -1;
        /* update DSA table */
        esiop_script_write(sc, esiop_target->lun_table_offset +
            lun * 2 + A_target_luntbl / sizeof(uint32_t),
            esiop_cmd->cmd_c.dsa);
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD |  BUS_DMASYNC_PREWRITE);
        return 0;
}

/*
 * handle a bus reset: reset chip, unqueue all active commands, free all
 * target struct and report lossage to upper layer.
 * As the upper layer may requeue immediately we have to first store
 * all active commands in a temporary queue.
 */
void
esiop_handle_reset(struct esiop_softc *sc)
{
        struct esiop_cmd *esiop_cmd;
        struct esiop_lun *esiop_lun;
        int target, lun, tag;
        /*
         * scsi bus reset. reset the chip and restart
         * the queue. Need to clean up all active commands
         */
        printf("%s: scsi bus reset\n", device_xname(sc->sc_c.sc_dev));
        /* stop, reset and restart the chip */
        esiop_reset(sc);

        if (sc->sc_flags & SCF_CHAN_NOSLOT) {
                /* chip has been reset, all slots are free now */
                sc->sc_flags &= ~SCF_CHAN_NOSLOT;
                scsipi_channel_thaw(&sc->sc_c.sc_chan, 1);
        }
        /*
         * Process all commands: first commands completes, then commands
         * being executed
         */
        esiop_checkdone(sc);
        for (target = 0; target < sc->sc_c.sc_chan.chan_ntargets; target++) {
                struct esiop_target *esiop_target =
                    (struct esiop_target *)sc->sc_c.targets[target];
                if (esiop_target == NULL)
                        continue;
                for (lun = 0; lun < 8; lun++) {
                        esiop_lun = esiop_target->esiop_lun[lun];
                        if (esiop_lun == NULL)
                                continue;
                        for (tag = -1; tag <
                            ((sc->sc_c.targets[target]->flags & TARF_TAG) ?
                            ESIOP_NTAG : 0);
                            tag++) {
                                if (tag >= 0)
                                        esiop_cmd = esiop_lun->tactive[tag];
                                else
                                        esiop_cmd = esiop_lun->active;
                                if (esiop_cmd == NULL)
                                        continue;
                                scsipi_printaddr(
                                    esiop_cmd->cmd_c.xs->xs_periph);
                                printf("command with tag id %d reset\n", tag);
                                esiop_cmd->cmd_c.xs->error =
                                    (esiop_cmd->cmd_c.flags & CMDFL_TIMEOUT) ?
                                    XS_TIMEOUT : XS_RESET;
                                esiop_cmd->cmd_c.xs->status = SCSI_SIOP_NOCHECK;
                                if (tag >= 0)
                                        esiop_lun->tactive[tag] = NULL;
                                else
                                        esiop_lun->active = NULL;
                                esiop_cmd->cmd_c.status = CMDST_DONE;
                                esiop_scsicmd_end(esiop_cmd, 0);
                        }
                }
                sc->sc_c.targets[target]->status = TARST_ASYNC;
                sc->sc_c.targets[target]->flags &= ~(TARF_ISWIDE | TARF_ISDT);
                sc->sc_c.targets[target]->period =
                    sc->sc_c.targets[target]->offset = 0;
                siop_update_xfer_mode(&sc->sc_c, target);
        }

        scsipi_async_event(&sc->sc_c.sc_chan, ASYNC_EVENT_RESET, NULL);
}

void
esiop_scsipi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req,
    void *arg)
{
        struct scsipi_xfer *xs;
        struct scsipi_periph *periph;
        struct esiop_softc *sc = device_private(chan->chan_adapter->adapt_dev);
        struct esiop_cmd *esiop_cmd;
        struct esiop_target *esiop_target;
        int s, error, i;
        int target;
        int lun;

        switch (req) {
        case ADAPTER_REQ_RUN_XFER:
                xs = arg;
                periph = xs->xs_periph;
                target = periph->periph_target;
                lun = periph->periph_lun;

                s = splbio();
                /*
                 * first check if there are pending complete commands.
                 * this can free us some resources (in the rings for example).
                 * we have to lock it to avoid recursion.
                 */
                if ((sc->sc_flags & SCF_CHAN_ADAPTREQ) == 0) {
                        sc->sc_flags |= SCF_CHAN_ADAPTREQ;
                        esiop_checkdone(sc);
                        sc->sc_flags &= ~SCF_CHAN_ADAPTREQ;
                }
#ifdef SIOP_DEBUG_SCHED
                printf("starting cmd for %d:%d tag %d(%d)\n", target, lun,
                    xs->xs_tag_type, xs->xs_tag_id);
#endif
                esiop_cmd = TAILQ_FIRST(&sc->free_list);
                if (esiop_cmd == NULL) {
                        xs->error = XS_RESOURCE_SHORTAGE;
                        scsipi_done(xs);
                        splx(s);
                        return;
                }
                TAILQ_REMOVE(&sc->free_list, esiop_cmd, next);
#ifdef DIAGNOSTIC
                if (esiop_cmd->cmd_c.status != CMDST_FREE)
                        panic("siop_scsicmd: new cmd not free");
#endif
                esiop_target = (struct esiop_target*)sc->sc_c.targets[target];
                if (esiop_target == NULL) {
#ifdef SIOP_DEBUG
                        printf("%s: alloc siop_target for target %d\n",
                                device_xname(sc->sc_c.sc_dev), target);
#endif
                        sc->sc_c.targets[target] =
                            malloc(sizeof(struct esiop_target),
                                M_DEVBUF, M_NOWAIT | M_ZERO);
                        if (sc->sc_c.targets[target] == NULL) {
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "can't malloc memory for "
                                    "target %d\n",
                                    target);
                                xs->error = XS_RESOURCE_SHORTAGE;
                                scsipi_done(xs);
                                TAILQ_INSERT_TAIL(&sc->free_list,
                                    esiop_cmd, next);
                                splx(s);
                                return;
                        }
                        esiop_target =
                            (struct esiop_target*)sc->sc_c.targets[target];
                        esiop_target->target_c.status = TARST_PROBING;
                        esiop_target->target_c.flags = 0;
                        esiop_target->target_c.id =
                            sc->sc_c.clock_div << 24; /* scntl3 */
                        esiop_target->target_c.id |=  target << 16; /* id */
                        /* esiop_target->target_c.id |= 0x0 << 8; scxfer is 0 */

                        for (i=0; i < 8; i++)
                                esiop_target->esiop_lun[i] = NULL;
                        esiop_target_register(sc, target);
                }
                if (esiop_target->esiop_lun[lun] == NULL) {
                        esiop_target->esiop_lun[lun] =
                            malloc(sizeof(struct esiop_lun), M_DEVBUF,
                            M_NOWAIT|M_ZERO);
                        if (esiop_target->esiop_lun[lun] == NULL) {
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "can't alloc esiop_lun for "
                                    "target %d lun %d\n",
                                    target, lun);
                                xs->error = XS_RESOURCE_SHORTAGE;
                                scsipi_done(xs);
                                TAILQ_INSERT_TAIL(&sc->free_list,
                                    esiop_cmd, next);
                                splx(s);
                                return;
                        }
                }
                esiop_cmd->cmd_c.siop_target = sc->sc_c.targets[target];
                esiop_cmd->cmd_c.xs = xs;
                esiop_cmd->cmd_c.flags = 0;
                esiop_cmd->cmd_c.status = CMDST_READY;

                /* load the DMA maps */
                error = bus_dmamap_load(sc->sc_c.sc_dmat,
                    esiop_cmd->cmd_c.dmamap_cmd,
                    xs->cmd, xs->cmdlen, NULL, BUS_DMA_NOWAIT);
                if (error) {
                        aprint_error_dev(sc->sc_c.sc_dev,
                            "unable to load cmd DMA map: %d\n",
                            error);
                        xs->error = (error == EAGAIN) ?
                            XS_RESOURCE_SHORTAGE : XS_DRIVER_STUFFUP;
                        scsipi_done(xs);
                        esiop_cmd->cmd_c.status = CMDST_FREE;
                        TAILQ_INSERT_TAIL(&sc->free_list, esiop_cmd, next);
                        splx(s);
                        return;
                }
                if (xs->xs_control & (XS_CTL_DATA_IN | XS_CTL_DATA_OUT)) {
                        error = bus_dmamap_load(sc->sc_c.sc_dmat,
                            esiop_cmd->cmd_c.dmamap_data, xs->data, xs->datalen,
                            NULL, BUS_DMA_NOWAIT | BUS_DMA_STREAMING |
                            ((xs->xs_control & XS_CTL_DATA_IN) ?
                             BUS_DMA_READ : BUS_DMA_WRITE));
                        if (error) {
                                aprint_error_dev(sc->sc_c.sc_dev,
                                    "unable to load data DMA map: %d\n",
                                    error);
                                xs->error = (error == EAGAIN) ?
                                    XS_RESOURCE_SHORTAGE : XS_DRIVER_STUFFUP;
                                scsipi_done(xs);
                                bus_dmamap_unload(sc->sc_c.sc_dmat,
                                    esiop_cmd->cmd_c.dmamap_cmd);
                                esiop_cmd->cmd_c.status = CMDST_FREE;
                                TAILQ_INSERT_TAIL(&sc->free_list,
                                    esiop_cmd, next);
                                splx(s);
                                return;
                        }
                        bus_dmamap_sync(sc->sc_c.sc_dmat,
                            esiop_cmd->cmd_c.dmamap_data, 0,
                            esiop_cmd->cmd_c.dmamap_data->dm_mapsize,
                            (xs->xs_control & XS_CTL_DATA_IN) ?
                            BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);
                }
                bus_dmamap_sync(sc->sc_c.sc_dmat, esiop_cmd->cmd_c.dmamap_cmd,
                    0, esiop_cmd->cmd_c.dmamap_cmd->dm_mapsize,
                    BUS_DMASYNC_PREWRITE);

                if (xs->xs_tag_type)
                        esiop_cmd->cmd_c.tag = xs->xs_tag_id;
                else
                        esiop_cmd->cmd_c.tag = -1;
                siop_setuptables(&esiop_cmd->cmd_c);
                ESIOP_XFER(esiop_cmd, saved_offset) = htole32(SIOP_NOOFFSET);
                ESIOP_XFER(esiop_cmd, tlq) = htole32(A_f_c_target | A_f_c_lun);
                ESIOP_XFER(esiop_cmd, tlq) |=
                    htole32((target << 8) | (lun << 16));
                if (esiop_cmd->cmd_c.flags & CMDFL_TAG) {
                        ESIOP_XFER(esiop_cmd, tlq) |= htole32(A_f_c_tag);
                        ESIOP_XFER(esiop_cmd, tlq) |=
                            htole32(esiop_cmd->cmd_c.tag << 24);
                }

                esiop_table_sync(esiop_cmd,
                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                esiop_start(sc, esiop_cmd);
                if (xs->xs_control & XS_CTL_POLL) {
                        /* poll for command completion */
                        while ((xs->xs_status & XS_STS_DONE) == 0) {
                                delay(1000);
                                esiop_intr(sc);
                        }
                }
                splx(s);
                return;

        case ADAPTER_REQ_GROW_RESOURCES:
#ifdef SIOP_DEBUG
                printf("%s grow resources (%d)\n",
                    device_xname(sc->sc_c.sc_dev),
                    sc->sc_c.sc_adapt.adapt_openings);
#endif
                esiop_morecbd(sc);
                return;

        case ADAPTER_REQ_SET_XFER_MODE:
            {
                struct scsipi_xfer_mode *xm = arg;
                if (sc->sc_c.targets[xm->xm_target] == NULL)
                        return;
                s = splbio();
                if (xm->xm_mode & PERIPH_CAP_TQING) {
                        sc->sc_c.targets[xm->xm_target]->flags |= TARF_TAG;
                        /* allocate tag tables for this device */
                        for (lun = 0;
                            lun < sc->sc_c.sc_chan.chan_nluns; lun++) {
                                if (scsipi_lookup_periph(chan,
                                    xm->xm_target, lun) != NULL)
                                        esiop_add_dev(sc, xm->xm_target, lun);
                        }
                }
                if ((xm->xm_mode & PERIPH_CAP_WIDE16) &&
                    (sc->sc_c.features & SF_BUS_WIDE))
                        sc->sc_c.targets[xm->xm_target]->flags |= TARF_WIDE;
                if (xm->xm_mode & PERIPH_CAP_SYNC)
                        sc->sc_c.targets[xm->xm_target]->flags |= TARF_SYNC;
                if ((xm->xm_mode & PERIPH_CAP_DT) &&
                    (sc->sc_c.features & SF_CHIP_DT))
                        sc->sc_c.targets[xm->xm_target]->flags |= TARF_DT;
                if ((xm->xm_mode &
                    (PERIPH_CAP_SYNC | PERIPH_CAP_WIDE16 | PERIPH_CAP_DT)) ||
                    sc->sc_c.targets[xm->xm_target]->status == TARST_PROBING)
                        sc->sc_c.targets[xm->xm_target]->status = TARST_ASYNC;

                splx(s);
            }
        }
}

static void
esiop_start(struct esiop_softc *sc, struct esiop_cmd *esiop_cmd)
{
        struct esiop_lun *esiop_lun;
        struct esiop_target *esiop_target;
        int timeout;
        int target, lun, slot;

        /*
         * first make sure to read valid data
         */
        esiop_script_sync(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);

        /*
         * We use a circular queue here. sc->sc_currschedslot points to a
         * free slot, unless we have filled the queue. Check this.
         */
        slot = sc->sc_currschedslot;
        if ((esiop_script_read(sc, sc->sc_shedoffset + slot * CMD_SLOTSIZE) &
            A_f_cmd_free) == 0) {
                /*
                 * no more free slot, no need to continue. freeze the queue
                 * and requeue this command.
                 */
                scsipi_channel_freeze(&sc->sc_c.sc_chan, 1);
                sc->sc_flags |= SCF_CHAN_NOSLOT;
                esiop_script_write(sc, sc->sc_semoffset,
                    esiop_script_read(sc, sc->sc_semoffset) & ~A_sem_start);
                esiop_script_sync(sc,
                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                esiop_cmd->cmd_c.xs->error = XS_REQUEUE;
                esiop_cmd->cmd_c.xs->status = SCSI_SIOP_NOCHECK;
                esiop_scsicmd_end(esiop_cmd, 0);
                return;
        }
        /* OK, we can use this slot */

        target = esiop_cmd->cmd_c.xs->xs_periph->periph_target;
        lun = esiop_cmd->cmd_c.xs->xs_periph->periph_lun;
        esiop_target = (struct esiop_target*)sc->sc_c.targets[target];
        esiop_lun = esiop_target->esiop_lun[lun];
        /* if non-tagged command active, panic: this shouldn't happen */
        if (esiop_lun->active != NULL) {
                panic("esiop_start: tagged cmd while untagged running");
        }
#ifdef DIAGNOSTIC
        /* sanity check the tag if needed */
        if (esiop_cmd->cmd_c.flags & CMDFL_TAG) {
                if (esiop_cmd->cmd_c.tag >= ESIOP_NTAG ||
                    esiop_cmd->cmd_c.tag < 0) {
                        scsipi_printaddr(esiop_cmd->cmd_c.xs->xs_periph);
                        printf(": tag id %d\n", esiop_cmd->cmd_c.tag);
                        panic("esiop_start: invalid tag id");
                }
                if (esiop_lun->tactive[esiop_cmd->cmd_c.tag] != NULL)
                        panic("esiop_start: tag not free");
        }
#endif
#ifdef SIOP_DEBUG_SCHED
        printf("using slot %d for DSA 0x%lx\n", slot,
            (u_long)esiop_cmd->cmd_c.dsa);
#endif
        /* mark command as active */
        if (esiop_cmd->cmd_c.status == CMDST_READY)
                esiop_cmd->cmd_c.status = CMDST_ACTIVE;
        else
                panic("esiop_start: bad status");
        /* DSA table for reselect */
        if (esiop_cmd->cmd_c.flags & CMDFL_TAG) {
                esiop_lun->tactive[esiop_cmd->cmd_c.tag] = esiop_cmd;
                /* DSA table for reselect */
                esiop_lun->lun_tagtbl->tbl[esiop_cmd->cmd_c.tag] =
                    htole32(esiop_cmd->cmd_c.dsa);
                bus_dmamap_sync(sc->sc_c.sc_dmat,
                    esiop_lun->lun_tagtbl->tblblk->blkmap,
                    esiop_lun->lun_tagtbl->tbl_offset,
                    sizeof(uint32_t) * ESIOP_NTAG, BUS_DMASYNC_PREWRITE);
        } else {
                esiop_lun->active = esiop_cmd;
                esiop_script_write(sc,
                    esiop_target->lun_table_offset +
                    lun * 2 + A_target_luntbl / sizeof(uint32_t),
                    esiop_cmd->cmd_c.dsa);
        }
        /* scheduler slot: DSA */
        esiop_script_write(sc, sc->sc_shedoffset + slot * CMD_SLOTSIZE,
            esiop_cmd->cmd_c.dsa);
        /* make sure SCRIPT processor will read valid data */
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD |  BUS_DMASYNC_PREWRITE);
        /* handle timeout */
        if ((esiop_cmd->cmd_c.xs->xs_control & XS_CTL_POLL) == 0) {
                /* start exire timer */
                timeout = mstohz(esiop_cmd->cmd_c.xs->timeout);
                if (timeout == 0)
                        timeout = 1;
                callout_reset( &esiop_cmd->cmd_c.xs->xs_callout,
                    timeout, esiop_timeout, esiop_cmd);
        }
        /* Signal script it has some work to do */
        bus_space_write_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh,
            SIOP_ISTAT, ISTAT_SIGP);
        /* update the current slot, and wait for IRQ */
        sc->sc_currschedslot++;
        if (sc->sc_currschedslot >= A_ncmd_slots)
                sc->sc_currschedslot = 0;
}

void
esiop_timeout(void *v)
{
        struct esiop_cmd *esiop_cmd = v;
        struct esiop_softc *sc =
            (struct esiop_softc *)esiop_cmd->cmd_c.siop_sc;
        int s;
#ifdef SIOP_DEBUG
        int slot, slotdsa;
#endif

        s = splbio();
        esiop_table_sync(esiop_cmd,
            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
        scsipi_printaddr(esiop_cmd->cmd_c.xs->xs_periph);
#ifdef SIOP_DEBUG
        printf("command timeout (status %d)\n",
            le32toh(esiop_cmd->cmd_tables->status));

        esiop_script_sync(sc, BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
        for (slot = 0; slot < A_ncmd_slots; slot++) {
                slotdsa = esiop_script_read(sc,
                    sc->sc_shedoffset + slot * CMD_SLOTSIZE);
                if ((slotdsa & 0x01) == 0)
                        printf("slot %d not free (0x%x)\n", slot, slotdsa);
        }
        printf("istat 0x%x ",
            bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_ISTAT));
        printf("DSP 0x%lx DSA 0x%x\n",
            (u_long)(bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSP)
            - sc->sc_c.sc_scriptaddr),
            bus_space_read_4(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_DSA));
        (void)bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_CTEST2);
        printf("istat 0x%x\n",
            bus_space_read_1(sc->sc_c.sc_rt, sc->sc_c.sc_rh, SIOP_ISTAT));
#else
        printf("command timeout, CDB: ");
        scsipi_print_cdb(esiop_cmd->cmd_c.xs->cmd);
        printf("\n");
#endif
        /* reset the scsi bus */
        siop_resetbus(&sc->sc_c);

        /* deactivate callout */
        callout_stop(&esiop_cmd->cmd_c.xs->xs_callout);
        /*
         * mark command has being timed out and just return;
         * the bus reset will generate an interrupt,
         * it will be handled in siop_intr()
         */
        esiop_cmd->cmd_c.flags |= CMDFL_TIMEOUT;
        splx(s);
}

void
esiop_dump_script(struct esiop_softc *sc)
{
        int i;

        for (i = 0; i < PAGE_SIZE / 4; i += 2) {
                printf("0x%04x: 0x%08x 0x%08x", i * 4,
                    esiop_script_read(sc, i),
                    esiop_script_read(sc, i + 1));
                if ((esiop_script_read(sc, i) & 0xe0000000) == 0xc0000000) {
                        i++;
                        printf(" 0x%08x", esiop_script_read(sc, i + 1));
                }
                printf("\n");
        }
}

void
esiop_morecbd(struct esiop_softc *sc)
{
        int error, i, s;
        bus_dma_segment_t seg;
        int rseg;
        struct esiop_cbd *newcbd;
        struct esiop_xfer *xfer;
        bus_addr_t dsa;

        /* allocate a new list head */
        newcbd = malloc(sizeof(struct esiop_cbd), M_DEVBUF, M_NOWAIT|M_ZERO);
        if (newcbd == NULL) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "can't allocate memory for command descriptors "
                    "head\n");
                return;
        }

        /* allocate cmd list */
        newcbd->cmds = malloc(sizeof(struct esiop_cmd) * SIOP_NCMDPB,
            M_DEVBUF, M_NOWAIT|M_ZERO);
        if (newcbd->cmds == NULL) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "can't allocate memory for command descriptors\n");
                goto bad3;
        }
        error = bus_dmamem_alloc(sc->sc_c.sc_dmat, PAGE_SIZE, PAGE_SIZE, 0,
            &seg, 1, &rseg, BUS_DMA_NOWAIT);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to allocate cbd DMA memory, error = %d\n",
                    error);
                goto bad2;
        }
        error = bus_dmamem_map(sc->sc_c.sc_dmat, &seg, rseg, PAGE_SIZE,
            (void **)&newcbd->xfers, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to map cbd DMA memory, error = %d\n",
                    error);
                goto bad2;
        }
        error = bus_dmamap_create(sc->sc_c.sc_dmat, PAGE_SIZE, 1, PAGE_SIZE, 0,
            BUS_DMA_NOWAIT, &newcbd->xferdma);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to create cbd DMA map, error = %d\n", error);
                goto bad1;
        }
        error = bus_dmamap_load(sc->sc_c.sc_dmat, newcbd->xferdma,
            newcbd->xfers, PAGE_SIZE, NULL, BUS_DMA_NOWAIT);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to load cbd DMA map, error = %d\n", error);
                goto bad0;
        }
#ifdef SIOP_DEBUG
        aprint_debug_dev(sc->sc_c.sc_dev, "alloc newcdb at PHY addr 0x%lx\n",
            (unsigned long)newcbd->xferdma->dm_segs[0].ds_addr);
#endif
        for (i = 0; i < SIOP_NCMDPB; i++) {
                error = bus_dmamap_create(sc->sc_c.sc_dmat, MAXPHYS, SIOP_NSG,
                    MAXPHYS, 0, BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW,
                    &newcbd->cmds[i].cmd_c.dmamap_data);
                if (error) {
                        aprint_error_dev(sc->sc_c.sc_dev,
                            "unable to create data DMA map for cbd: "
                            "error %d\n", error);
                        goto bad0;
                }
                error = bus_dmamap_create(sc->sc_c.sc_dmat,
                    sizeof(struct scsipi_generic), 1,
                    sizeof(struct scsipi_generic), 0,
                    BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW,
                    &newcbd->cmds[i].cmd_c.dmamap_cmd);
                if (error) {
                        aprint_error_dev(sc->sc_c.sc_dev,
                            "unable to create cmd DMA map for cbd %d\n", error);
                        goto bad0;
                }
                newcbd->cmds[i].cmd_c.siop_sc = &sc->sc_c;
                newcbd->cmds[i].esiop_cbdp = newcbd;
                xfer = &newcbd->xfers[i];
                newcbd->cmds[i].cmd_tables = (struct siop_common_xfer *)xfer;
                memset(newcbd->cmds[i].cmd_tables, 0,
                    sizeof(struct esiop_xfer));
                dsa = newcbd->xferdma->dm_segs[0].ds_addr +
                    i * sizeof(struct esiop_xfer);
                newcbd->cmds[i].cmd_c.dsa = dsa;
                newcbd->cmds[i].cmd_c.status = CMDST_FREE;
                xfer->siop_tables.t_msgout.count= htole32(1);
                xfer->siop_tables.t_msgout.addr = htole32(dsa);
                xfer->siop_tables.t_msgin.count= htole32(1);
                xfer->siop_tables.t_msgin.addr = htole32(dsa +
                    offsetof(struct siop_common_xfer, msg_in));
                xfer->siop_tables.t_extmsgin.count= htole32(2);
                xfer->siop_tables.t_extmsgin.addr = htole32(dsa +
                    offsetof(struct siop_common_xfer, msg_in) + 1);
                xfer->siop_tables.t_extmsgdata.addr = htole32(dsa +
                    offsetof(struct siop_common_xfer, msg_in) + 3);
                xfer->siop_tables.t_status.count= htole32(1);
                xfer->siop_tables.t_status.addr = htole32(dsa +
                    offsetof(struct siop_common_xfer, status));

                s = splbio();
                TAILQ_INSERT_TAIL(&sc->free_list, &newcbd->cmds[i], next);
                splx(s);
#ifdef SIOP_DEBUG
                printf("tables[%d]: in=0x%x out=0x%x status=0x%x\n", i,
                    le32toh(newcbd->cmds[i].cmd_tables->t_msgin.addr),
                    le32toh(newcbd->cmds[i].cmd_tables->t_msgout.addr),
                    le32toh(newcbd->cmds[i].cmd_tables->t_status.addr));
#endif
        }
        s = splbio();
        TAILQ_INSERT_TAIL(&sc->cmds, newcbd, next);
        sc->sc_c.sc_adapt.adapt_openings += SIOP_NCMDPB;
        splx(s);
        return;
bad0:
        bus_dmamap_unload(sc->sc_c.sc_dmat, newcbd->xferdma);
        bus_dmamap_destroy(sc->sc_c.sc_dmat, newcbd->xferdma);
bad1:
        bus_dmamem_free(sc->sc_c.sc_dmat, &seg, rseg);
bad2:
        free(newcbd->cmds, M_DEVBUF);
bad3:
        free(newcbd, M_DEVBUF);
}

void
esiop_moretagtbl(struct esiop_softc *sc)
{
        int error, i, j, s;
        bus_dma_segment_t seg;
        int rseg;
        struct esiop_dsatblblk *newtblblk;
        struct esiop_dsatbl *newtbls;
        uint32_t *tbls;

        /* allocate a new list head */
        newtblblk = malloc(sizeof(struct esiop_dsatblblk),
            M_DEVBUF, M_NOWAIT|M_ZERO);
        if (newtblblk == NULL) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "can't allocate memory for tag DSA table block\n");
                return;
        }

        /* allocate tbl list */
        newtbls = malloc(sizeof(struct esiop_dsatbl) * ESIOP_NTPB,
            M_DEVBUF, M_NOWAIT|M_ZERO);
        if (newtbls == NULL) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "can't allocate memory for command descriptors\n");
                goto bad3;
        }
        error = bus_dmamem_alloc(sc->sc_c.sc_dmat, PAGE_SIZE, PAGE_SIZE, 0,
            &seg, 1, &rseg, BUS_DMA_NOWAIT);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to allocate tbl DMA memory, error = %d\n", error);
                goto bad2;
        }
        error = bus_dmamem_map(sc->sc_c.sc_dmat, &seg, rseg, PAGE_SIZE,
            (void *)&tbls, BUS_DMA_NOWAIT|BUS_DMA_COHERENT);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to map tbls DMA memory, error = %d\n", error);
                goto bad2;
        }
        error = bus_dmamap_create(sc->sc_c.sc_dmat, PAGE_SIZE, 1, PAGE_SIZE, 0,
            BUS_DMA_NOWAIT, &newtblblk->blkmap);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to create tbl DMA map, error = %d\n", error);
                goto bad1;
        }
        error = bus_dmamap_load(sc->sc_c.sc_dmat, newtblblk->blkmap,
            tbls, PAGE_SIZE, NULL, BUS_DMA_NOWAIT);
        if (error) {
                aprint_error_dev(sc->sc_c.sc_dev,
                    "unable to load tbl DMA map, error = %d\n", error);
                goto bad0;
        }
#ifdef SIOP_DEBUG
        printf("%s: alloc new tag DSA table at PHY addr 0x%lx\n",
            device_xname(sc->sc_c.sc_dev),
            (unsigned long)newtblblk->blkmap->dm_segs[0].ds_addr);
#endif
        for (i = 0; i < ESIOP_NTPB; i++) {
                newtbls[i].tblblk = newtblblk;
                newtbls[i].tbl = &tbls[i * ESIOP_NTAG];
                newtbls[i].tbl_offset = i * ESIOP_NTAG * sizeof(uint32_t);
                newtbls[i].tbl_dsa = newtblblk->blkmap->dm_segs[0].ds_addr +
                    newtbls[i].tbl_offset;
                for (j = 0; j < ESIOP_NTAG; j++)
                        newtbls[i].tbl[j] = j;
                s = splbio();
                TAILQ_INSERT_TAIL(&sc->free_tagtbl, &newtbls[i], next);
                splx(s);
        }
        s = splbio();
        TAILQ_INSERT_TAIL(&sc->tag_tblblk, newtblblk, next);
        splx(s);
        return;
bad0:
        bus_dmamap_unload(sc->sc_c.sc_dmat, newtblblk->blkmap);
        bus_dmamap_destroy(sc->sc_c.sc_dmat, newtblblk->blkmap);
bad1:
        bus_dmamem_free(sc->sc_c.sc_dmat, &seg, rseg);
bad2:
        free(newtbls, M_DEVBUF);
bad3:
        free(newtblblk, M_DEVBUF);
}

void
esiop_update_scntl3(struct esiop_softc *sc,
    struct siop_common_target *_siop_target)
{
        struct esiop_target *esiop_target = (struct esiop_target *)_siop_target;

        esiop_script_write(sc, esiop_target->lun_table_offset,
            esiop_target->target_c.id);
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}

void
esiop_add_dev(struct esiop_softc *sc, int target, int lun)
{
        struct esiop_target *esiop_target =
            (struct esiop_target *)sc->sc_c.targets[target];
        struct esiop_lun *esiop_lun = esiop_target->esiop_lun[lun];

        if (esiop_lun->lun_tagtbl != NULL)
                return; /* already allocated */

        /* we need a tag DSA table */
        esiop_lun->lun_tagtbl= TAILQ_FIRST(&sc->free_tagtbl);
        if (esiop_lun->lun_tagtbl == NULL) {
                esiop_moretagtbl(sc);
                esiop_lun->lun_tagtbl= TAILQ_FIRST(&sc->free_tagtbl);
                if (esiop_lun->lun_tagtbl == NULL) {
                        /* no resources, run untagged */
                        esiop_target->target_c.flags &= ~TARF_TAG;
                        return;
                }
        }
        TAILQ_REMOVE(&sc->free_tagtbl, esiop_lun->lun_tagtbl, next);
        /* Update LUN DSA table */
        esiop_script_write(sc, esiop_target->lun_table_offset +
           lun * 2 + A_target_luntbl_tag / sizeof(uint32_t),
            esiop_lun->lun_tagtbl->tbl_dsa);
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}

void
esiop_del_dev(struct esiop_softc *sc, int target, int lun)
{
        struct esiop_target *esiop_target;

#ifdef SIOP_DEBUG
                printf("%s:%d:%d: free lun sw entry\n",
                    device_xname(sc->sc_c.sc_dev), target, lun);
#endif
        if (sc->sc_c.targets[target] == NULL)
                return;
        esiop_target = (struct esiop_target *)sc->sc_c.targets[target];
        free(esiop_target->esiop_lun[lun], M_DEVBUF);
        esiop_target->esiop_lun[lun] = NULL;
}

void
esiop_target_register(struct esiop_softc *sc, uint32_t target)
{
        struct esiop_target *esiop_target =
            (struct esiop_target *)sc->sc_c.targets[target];
        struct esiop_lun *esiop_lun;
        int lun;

        /* get a DSA table for this target */
        esiop_target->lun_table_offset = sc->sc_free_offset;
        sc->sc_free_offset += sc->sc_c.sc_chan.chan_nluns * 2 + 2;
#ifdef SIOP_DEBUG
        printf("%s: lun table for target %d offset %d free offset %d\n",
            device_xname(sc->sc_c.sc_dev), target,
            esiop_target->lun_table_offset,
            sc->sc_free_offset);
#endif
        /* first 32 bytes are ID (for select) */
        esiop_script_write(sc, esiop_target->lun_table_offset,
            esiop_target->target_c.id);
        /* Record this table in the target DSA table */
        esiop_script_write(sc,
            sc->sc_target_table_offset + target,
            (esiop_target->lun_table_offset * sizeof(uint32_t)) +
            sc->sc_c.sc_scriptaddr);
        /* if we have a tag table, register it */
        for (lun = 0; lun < sc->sc_c.sc_chan.chan_nluns; lun++) {
                esiop_lun = esiop_target->esiop_lun[lun];
                if (esiop_lun == NULL)
                        continue;
                if (esiop_lun->lun_tagtbl)
                        esiop_script_write(sc, esiop_target->lun_table_offset +
                           lun * 2 + A_target_luntbl_tag / sizeof(uint32_t),
                            esiop_lun->lun_tagtbl->tbl_dsa);
        }
        esiop_script_sync(sc, BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}

#ifdef SIOP_STATS
void
esiop_printstats(void)
{

        printf("esiop_stat_intr %d\n", esiop_stat_intr);
        printf("esiop_stat_intr_shortxfer %d\n", esiop_stat_intr_shortxfer);
        printf("esiop_stat_intr_xferdisc %d\n", esiop_stat_intr_xferdisc);
        printf("esiop_stat_intr_sdp %d\n", esiop_stat_intr_sdp);
        printf("esiop_stat_intr_done %d\n", esiop_stat_intr_done);
        printf("esiop_stat_intr_lunresel %d\n", esiop_stat_intr_lunresel);
        printf("esiop_stat_intr_qfull %d\n", esiop_stat_intr_qfull);
}
#endif