sys/dev/ic/oosiop.c

root/sys/dev/ic/oosiop.c
/*      $NetBSD: oosiop.c,v 1.19 2024/02/09 22:08:34 andvar Exp $       */

/*
 * Copyright (c) 2001 Shuichiro URATA.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * NCR53C700 SCSI I/O processor (OOSIOP) driver
 *
 * TODO:
 *   - More better error handling.
 *   - Implement tagged queuing.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: oosiop.c,v 1.19 2024/02/09 22:08:34 andvar Exp $");

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

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

#include <sys/cpu.h>
#include <sys/bus.h>

#include <dev/ic/oosiopreg.h>
#include <dev/ic/oosiopvar.h>
#include <dev/microcode/siop/oosiop.out>

static int      oosiop_alloc_cb(struct oosiop_softc *, int);

static inline void oosiop_relocate_io(struct oosiop_softc *, bus_addr_t);
static inline void oosiop_relocate_tc(struct oosiop_softc *, bus_addr_t);
static inline void oosiop_fixup_select(struct oosiop_softc *, bus_addr_t,
                         int);
static inline void oosiop_fixup_jump(struct oosiop_softc *, bus_addr_t,
                         bus_addr_t);
static inline void oosiop_fixup_move(struct oosiop_softc *, bus_addr_t,
                         bus_size_t, bus_addr_t);

static void     oosiop_load_script(struct oosiop_softc *);
static void     oosiop_setup_sgdma(struct oosiop_softc *, struct oosiop_cb *);
static void     oosiop_setup_dma(struct oosiop_softc *);
static void     oosiop_flush_fifo(struct oosiop_softc *);
static void     oosiop_clear_fifo(struct oosiop_softc *);
static void     oosiop_phasemismatch(struct oosiop_softc *);
static void     oosiop_setup_syncxfer(struct oosiop_softc *);
static void     oosiop_set_syncparam(struct oosiop_softc *, int, int, int);
static void     oosiop_minphys(struct buf *);
static void     oosiop_scsipi_request(struct scsipi_channel *,
                    scsipi_adapter_req_t, void *);
static void     oosiop_done(struct oosiop_softc *, struct oosiop_cb *);
static void     oosiop_timeout(void *);
static void     oosiop_reset(struct oosiop_softc *);
static void     oosiop_reset_bus(struct oosiop_softc *);
static void     oosiop_scriptintr(struct oosiop_softc *);
static void     oosiop_msgin(struct oosiop_softc *, struct oosiop_cb *);

/* Trap interrupt code for unexpected data I/O */
#define DATAIN_TRAP     0xdead0001
#define DATAOUT_TRAP    0xdead0002

/* Possible TP and SCF combination */
static const struct {
        uint8_t         tp;
        uint8_t         scf;
} synctbl[] = {
        {0, 1},         /* SCLK /  4.0 */
        {1, 1},         /* SCLK /  5.0 */
        {2, 1},         /* SCLK /  6.0 */
        {3, 1},         /* SCLK /  7.0 */
        {1, 2},         /* SCLK /  7.5 */
        {4, 1},         /* SCLK /  8.0 */
        {5, 1},         /* SCLK /  9.0 */
        {6, 1},         /* SCLK / 10.0 */
        {3, 2},         /* SCLK / 10.5 */
        {7, 1},         /* SCLK / 11.0 */
        {4, 2},         /* SCLK / 12.0 */
        {5, 2},         /* SCLK / 13.5 */
        {3, 3},         /* SCLK / 14.0 */
        {6, 2},         /* SCLK / 15.0 */
        {4, 3},         /* SCLK / 16.0 */
        {7, 2},         /* SCLK / 16.5 */
        {5, 3},         /* SCLK / 18.0 */
        {6, 3},         /* SCLK / 20.0 */
        {7, 3}          /* SCLK / 22.0 */
};
#define NSYNCTBL        (sizeof(synctbl) / sizeof(synctbl[0]))

#define oosiop_period(sc, tp, scf)                                      \
            (((1000000000 / (sc)->sc_freq) * (tp) * (scf)) / 40)

void
oosiop_attach(struct oosiop_softc *sc)
{
        bus_size_t scrsize;
        bus_dma_segment_t seg;
        struct oosiop_cb *cb;
        int err, i, nseg;

        /*
         * Allocate DMA-safe memory for the script and map it.
         */
        scrsize = sizeof(oosiop_script);
        err = bus_dmamem_alloc(sc->sc_dmat, scrsize, PAGE_SIZE, 0, &seg, 1,
            &nseg, BUS_DMA_NOWAIT);
        if (err) {
                aprint_error(": failed to allocate script memory, err=%d\n",
                    err);
                return;
        }
        err = bus_dmamem_map(sc->sc_dmat, &seg, nseg, scrsize,
            (void **)&sc->sc_scr, BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
        if (err) {
                aprint_error(": failed to map script memory, err=%d\n", err);
                return;
        }
        err = bus_dmamap_create(sc->sc_dmat, scrsize, 1, scrsize, 0,
            BUS_DMA_NOWAIT, &sc->sc_scrdma);
        if (err) {
                aprint_error(": failed to create script map, err=%d\n", err);
                return;
        }
        err = bus_dmamap_load(sc->sc_dmat, sc->sc_scrdma, sc->sc_scr, scrsize,
            NULL, BUS_DMA_NOWAIT | BUS_DMA_WRITE);
        if (err) {
                aprint_error(": failed to load script map, err=%d\n", err);
                return;
        }
        sc->sc_scrbase = sc->sc_scrdma->dm_segs[0].ds_addr;

        /* Initialize command block array */
        TAILQ_INIT(&sc->sc_free_cb);
        TAILQ_INIT(&sc->sc_cbq);
        if (oosiop_alloc_cb(sc, OOSIOP_NCB) != 0)
                return;

        /* Use first cb to reselection msgin buffer */
        cb = TAILQ_FIRST(&sc->sc_free_cb);
        sc->sc_reselbuf = cb->xferdma->dm_segs[0].ds_addr +
            offsetof(struct oosiop_xfer, msgin[0]);

        for (i = 0; i < OOSIOP_NTGT; i++) {
                sc->sc_tgt[i].nexus = NULL;
                sc->sc_tgt[i].flags = 0;
        }

        /* Setup asynchronous clock divisor parameters */
        if (sc->sc_freq <= 25000000) {
                sc->sc_ccf = 10;
                sc->sc_dcntl = OOSIOP_DCNTL_CF_1;
        } else if (sc->sc_freq <= 37500000) {
                sc->sc_ccf = 15;
                sc->sc_dcntl = OOSIOP_DCNTL_CF_1_5;
        } else if (sc->sc_freq <= 50000000) {
                sc->sc_ccf = 20;
                sc->sc_dcntl = OOSIOP_DCNTL_CF_2;
        } else {
                sc->sc_ccf = 30;
                sc->sc_dcntl = OOSIOP_DCNTL_CF_3;
        }

        if (sc->sc_chip == OOSIOP_700)
                sc->sc_minperiod = oosiop_period(sc, 4, sc->sc_ccf);
        else
                sc->sc_minperiod = oosiop_period(sc, 4, 10);

        if (sc->sc_minperiod < 25)
                sc->sc_minperiod = 25;  /* limit to 10MB/s */

        aprint_normal(": NCR53C700%s rev %d, %dMHz, SCSI ID %d\n",
            sc->sc_chip == OOSIOP_700_66 ? "-66" : "",
            oosiop_read_1(sc, OOSIOP_CTEST7) >> 4,
            sc->sc_freq / 1000000, sc->sc_id);
        /*
         * Reset all
         */
        oosiop_reset(sc);
        oosiop_reset_bus(sc);

        /*
         * Start SCRIPTS processor
         */
        oosiop_load_script(sc);
        sc->sc_active = 0;
        oosiop_write_4(sc, OOSIOP_DSP, sc->sc_scrbase + Ent_wait_reselect);

        /*
         * Fill in the scsipi_adapter.
         */
        sc->sc_adapter.adapt_dev = sc->sc_dev;
        sc->sc_adapter.adapt_nchannels = 1;
        sc->sc_adapter.adapt_openings = OOSIOP_NCB;
        sc->sc_adapter.adapt_max_periph = 1;
        sc->sc_adapter.adapt_ioctl = NULL;
        sc->sc_adapter.adapt_minphys = oosiop_minphys;
        sc->sc_adapter.adapt_request = oosiop_scsipi_request;

        /*
         * Fill in the scsipi_channel.
         */
        sc->sc_channel.chan_adapter = &sc->sc_adapter;
        sc->sc_channel.chan_bustype = &scsi_bustype;
        sc->sc_channel.chan_channel = 0;
        sc->sc_channel.chan_ntargets = OOSIOP_NTGT;
        sc->sc_channel.chan_nluns = 8;
        sc->sc_channel.chan_id = sc->sc_id;

        /*
         * Now try to attach all the sub devices.
         */
        config_found(sc->sc_dev, &sc->sc_channel, scsiprint, CFARGS_NONE);
}

static int
oosiop_alloc_cb(struct oosiop_softc *sc, int ncb)
{
        struct oosiop_cb *cb;
        void *xfer_kva;
        struct oosiop_xfer *xfer;
        bus_size_t xfersize;
        bus_dma_segment_t seg;
        int i, s, err, nseg;

        /*
         * Allocate oosiop_cb.
         */
        cb = malloc(sizeof(struct oosiop_cb) * ncb, M_DEVBUF, M_WAITOK|M_ZERO);

        /*
         * Allocate DMA-safe memory for the oosiop_xfer and map it.
         */
        xfersize = sizeof(struct oosiop_xfer) * ncb;
        err = bus_dmamem_alloc(sc->sc_dmat, xfersize, PAGE_SIZE, 0, &seg, 1,
            &nseg, BUS_DMA_NOWAIT);
        if (err) {
                printf(": failed to allocate xfer block memory, err=%d\n", err);
                goto fail1;
        }
        KASSERT(nseg == 1);
        err = bus_dmamem_map(sc->sc_dmat, &seg, nseg, xfersize, &xfer_kva,
            BUS_DMA_NOWAIT | BUS_DMA_COHERENT);
        if (err) {
                printf(": failed to map xfer block memory, err=%d\n", err);
                goto fail2;
        }
        xfer = xfer_kva;

        /* Initialize each command block */
        for (i = 0; i < ncb; i++) {
                err = bus_dmamap_create(sc->sc_dmat, PAGE_SIZE, 1, PAGE_SIZE,
                    0, BUS_DMA_NOWAIT, &cb[i].cmddma);
                if (err) {
                        printf(": failed to create cmddma map, err=%d\n", err);
                        goto loop_fail0;
                }
                err = bus_dmamap_create(sc->sc_dmat, OOSIOP_MAX_XFER,
                    OOSIOP_NSG, OOSIOP_DBC_MAX, 0, BUS_DMA_NOWAIT,
                    &cb[i].datadma);
                if (err) {
                        printf(": failed to create datadma map, err=%d\n", err);
                        goto loop_fail1;
                }

                err = bus_dmamap_create(sc->sc_dmat,
                    sizeof(struct oosiop_xfer), 1, sizeof(struct oosiop_xfer),
                    0, BUS_DMA_NOWAIT, &cb[i].xferdma);
                if (err) {
                        printf(": failed to create xfer block map, err=%d\n",
                            err);
                        goto loop_fail2;
                }
                err = bus_dmamap_load(sc->sc_dmat, cb[i].xferdma, &xfer[i],
                    sizeof(struct oosiop_xfer), NULL, BUS_DMA_NOWAIT);
                if (err) {
                        printf(": failed to load xfer block, err=%d\n", err);
                        goto loop_fail3;
                }

                cb[i].xfer = &xfer[i];
                continue;

loop_fail4: __unused
                bus_dmamap_unload(sc->sc_dmat, cb[i].xferdma);
loop_fail3:     bus_dmamap_destroy(sc->sc_dmat, cb[i].xferdma);
loop_fail2:     bus_dmamap_destroy(sc->sc_dmat, cb[i].datadma);
loop_fail1:     bus_dmamap_destroy(sc->sc_dmat, cb[i].cmddma);
loop_fail0:     goto fail3;
        }

        for (i = 0; i < ncb; i++) {
                s = splbio();
                TAILQ_INSERT_TAIL(&sc->sc_free_cb, &cb[i], chain);
                splx(s);
        }

        /* Success!  */
        return 0;

fail3:  while (i--) {
                bus_dmamap_unload(sc->sc_dmat, cb[i].xferdma);
                bus_dmamap_destroy(sc->sc_dmat, cb[i].xferdma);
                bus_dmamap_destroy(sc->sc_dmat, cb[i].datadma);
                bus_dmamap_destroy(sc->sc_dmat, cb[i].cmddma);
        }
        bus_dmamem_unmap(sc->sc_dmat, xfer_kva, xfersize);
fail2:  bus_dmamem_free(sc->sc_dmat, &seg, 1);
fail1:  free(cb, M_DEVBUF);
        KASSERT(err);
        return err;
}

static inline void
oosiop_relocate_io(struct oosiop_softc *sc, bus_addr_t addr)
{
        uint32_t dcmd;
        int32_t dsps;

        dcmd = le32toh(sc->sc_scr[addr / 4 + 0]);
        dsps = le32toh(sc->sc_scr[addr / 4 + 1]);

        /* convert relative to absolute */
        if (dcmd & 0x04000000) {
                dcmd &= ~0x04000000;
#if 0
                /*
                 * sign extension isn't needed here because
                 * ncr53cxxx.c generates 32 bit dsps.
                 */
                dsps <<= 8;
                dsps >>= 8;
#endif
                sc->sc_scr[addr / 4 + 0] = htole32(dcmd);
                dsps += addr + 8;
        }

        sc->sc_scr[addr / 4 + 1] = htole32(dsps + sc->sc_scrbase);
}

static inline void
oosiop_relocate_tc(struct oosiop_softc *sc, bus_addr_t addr)
{
        uint32_t dcmd;
        int32_t dsps;

        dcmd = le32toh(sc->sc_scr[addr / 4 + 0]);
        dsps = le32toh(sc->sc_scr[addr / 4 + 1]);

        /* convert relative to absolute */
        if (dcmd & 0x00800000) {
                dcmd &= ~0x00800000;
                sc->sc_scr[addr / 4] = htole32(dcmd);
#if 0
                /*
                 * sign extension isn't needed here because
                 * ncr53cxxx.c generates 32 bit dsps.
                 */
                dsps <<= 8;
                dsps >>= 8;
#endif
                dsps += addr + 8;
        }

        sc->sc_scr[addr / 4 + 1] = htole32(dsps + sc->sc_scrbase);
}

static inline void
oosiop_fixup_select(struct oosiop_softc *sc, bus_addr_t addr, int id)
{
        uint32_t dcmd;

        dcmd = le32toh(sc->sc_scr[addr / 4]);
        dcmd &= 0xff00ffff;
        dcmd |= 0x00010000 << id;
        sc->sc_scr[addr / 4] = htole32(dcmd);
}

static inline void
oosiop_fixup_jump(struct oosiop_softc *sc, bus_addr_t addr, bus_addr_t dst)
{

        sc->sc_scr[addr / 4 + 1] = htole32(dst);
}

static inline void
oosiop_fixup_move(struct oosiop_softc *sc, bus_addr_t addr, bus_size_t dbc,
    bus_addr_t dsps)
{
        uint32_t dcmd;

        dcmd = le32toh(sc->sc_scr[addr / 4]);
        dcmd &= 0xff000000;
        dcmd |= dbc & 0x00ffffff;
        sc->sc_scr[addr / 4 + 0] = htole32(dcmd);
        sc->sc_scr[addr / 4 + 1] = htole32(dsps);
}

static void
oosiop_load_script(struct oosiop_softc *sc)
{
        int i;

        /* load script */
        for (i = 0; i < sizeof(oosiop_script) / sizeof(oosiop_script[0]); i++)
                sc->sc_scr[i] = htole32(oosiop_script[i]);

        /* relocate script */
        for (i = 0; i < (sizeof(oosiop_script) / 8); i++) {
                switch (oosiop_script[i * 2] >> 27) {
                case 0x08:      /* select */
                case 0x0a:      /* wait reselect */
                        oosiop_relocate_io(sc, i * 8);
                        break;
                case 0x10:      /* jump */
                case 0x11:      /* call */
                        oosiop_relocate_tc(sc, i * 8);
                        break;
                }
        }

        oosiop_fixup_move(sc, Ent_p_resel_msgin_move, 1, sc->sc_reselbuf);
        OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_PREWRITE);
}

static void
oosiop_setup_sgdma(struct oosiop_softc *sc, struct oosiop_cb *cb)
{
        int i, n, off, control;
        struct oosiop_xfer *xfer;

        OOSIOP_XFERSCR_SYNC(sc, cb,
            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);

        off = cb->curdp;
        xfer = cb->xfer;
        control = cb->xs->xs_control;

        if (control & (XS_CTL_DATA_IN | XS_CTL_DATA_OUT)) {
                /* Find start segment */
                for (i = 0; i < cb->datadma->dm_nsegs; i++) {
                        if (off < cb->datadma->dm_segs[i].ds_len)
                                break;
                        off -= cb->datadma->dm_segs[i].ds_len;
                }

                /* build MOVE block */
                if (control & XS_CTL_DATA_IN) {
                        n = 0;
                        while (i < cb->datadma->dm_nsegs) {
                                xfer->datain_scr[n * 2 + 0] =
                                    htole32(0x09000000 |
                                    (cb->datadma->dm_segs[i].ds_len - off));
                                xfer->datain_scr[n * 2 + 1] =
                                    htole32(cb->datadma->dm_segs[i].ds_addr +
                                    off);
                                n++;
                                i++;
                                off = 0;
                        }
                        xfer->datain_scr[n * 2 + 0] = htole32(0x80080000);
                        xfer->datain_scr[n * 2 + 1] =
                            htole32(sc->sc_scrbase + Ent_phasedispatch);
                }
                if (control & XS_CTL_DATA_OUT) {
                        n = 0;
                        while (i < cb->datadma->dm_nsegs) {
                                xfer->dataout_scr[n * 2 + 0] =
                                    htole32(0x08000000 |
                                    (cb->datadma->dm_segs[i].ds_len - off));
                                xfer->dataout_scr[n * 2 + 1] =
                                    htole32(cb->datadma->dm_segs[i].ds_addr +
                                    off);
                                n++;
                                i++;
                                off = 0;
                        }
                        xfer->dataout_scr[n * 2 + 0] = htole32(0x80080000);
                        xfer->dataout_scr[n * 2 + 1] =
                            htole32(sc->sc_scrbase + Ent_phasedispatch);
                }
        }
        if ((control & XS_CTL_DATA_IN) == 0) {
                xfer->datain_scr[0] = htole32(0x98080000);
                xfer->datain_scr[1] = htole32(DATAIN_TRAP);
        }
        if ((control & XS_CTL_DATA_OUT) == 0) {
                xfer->dataout_scr[0] = htole32(0x98080000);
                xfer->dataout_scr[1] = htole32(DATAOUT_TRAP);
        }
        OOSIOP_XFERSCR_SYNC(sc, cb,
            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
}

/*
 * Setup DMA pointer into script.
 */
static void
oosiop_setup_dma(struct oosiop_softc *sc)
{
        struct oosiop_cb *cb;
        bus_addr_t xferbase;

        cb = sc->sc_curcb;
        xferbase = cb->xferdma->dm_segs[0].ds_addr;

        OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_POSTWRITE);

        oosiop_fixup_select(sc, Ent_p_select, cb->id);
        oosiop_fixup_jump(sc, Ent_p_datain_jump, xferbase +
            offsetof(struct oosiop_xfer, datain_scr[0]));
        oosiop_fixup_jump(sc, Ent_p_dataout_jump, xferbase +
            offsetof(struct oosiop_xfer, dataout_scr[0]));
        oosiop_fixup_move(sc, Ent_p_msgin_move, 1, xferbase +
            offsetof(struct oosiop_xfer, msgin[0]));
        oosiop_fixup_move(sc, Ent_p_extmsglen_move, 1, xferbase +
            offsetof(struct oosiop_xfer, msgin[1]));
        oosiop_fixup_move(sc, Ent_p_msgout_move, cb->msgoutlen, xferbase +
            offsetof(struct oosiop_xfer, msgout[0]));
        oosiop_fixup_move(sc, Ent_p_status_move, 1, xferbase +
            offsetof(struct oosiop_xfer, status));
        oosiop_fixup_move(sc, Ent_p_cmdout_move, cb->xs->cmdlen,
            cb->cmddma->dm_segs[0].ds_addr);

        OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_PREWRITE);
}

static void
oosiop_flush_fifo(struct oosiop_softc *sc)
{

        oosiop_write_1(sc, OOSIOP_DFIFO, oosiop_read_1(sc, OOSIOP_DFIFO) |
            OOSIOP_DFIFO_FLF);
        while ((oosiop_read_1(sc, OOSIOP_CTEST1) & OOSIOP_CTEST1_FMT) !=
            OOSIOP_CTEST1_FMT)
                ;
        oosiop_write_1(sc, OOSIOP_DFIFO, oosiop_read_1(sc, OOSIOP_DFIFO) &
            ~OOSIOP_DFIFO_FLF);
}

static void
oosiop_clear_fifo(struct oosiop_softc *sc)
{

        oosiop_write_1(sc, OOSIOP_DFIFO, oosiop_read_1(sc, OOSIOP_DFIFO) |
            OOSIOP_DFIFO_CLF);
        while ((oosiop_read_1(sc, OOSIOP_CTEST1) & OOSIOP_CTEST1_FMT) !=
            OOSIOP_CTEST1_FMT)
                ;
        oosiop_write_1(sc, OOSIOP_DFIFO, oosiop_read_1(sc, OOSIOP_DFIFO) &
            ~OOSIOP_DFIFO_CLF);
}

static void
oosiop_phasemismatch(struct oosiop_softc *sc)
{
        struct oosiop_cb *cb;
        uint32_t dsp, dbc, n, i, len;
        uint8_t dfifo, sstat1;

        cb = sc->sc_curcb;
        if (cb == NULL)
                return;

        dsp = oosiop_read_4(sc, OOSIOP_DSP);
        dbc = oosiop_read_4(sc, OOSIOP_DBC) & OOSIOP_DBC_MAX;
        len = 0;

        n = dsp - cb->xferdma->dm_segs[0].ds_addr - 8;
        if (n >= offsetof(struct oosiop_xfer, datain_scr[0]) &&
            n < offsetof(struct oosiop_xfer, datain_scr[OOSIOP_NSG * 2])) {
                n -= offsetof(struct oosiop_xfer, datain_scr[0]);
                n >>= 3;
                OOSIOP_DINSCR_SYNC(sc, cb,
                    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
                for (i = 0; i <= n; i++)
                        len += le32toh(cb->xfer->datain_scr[i * 2]) &
                            0x00ffffff;
                OOSIOP_DINSCR_SYNC(sc, cb,
                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                /* All data in the chip are already flushed */
        } else if (n >= offsetof(struct oosiop_xfer, dataout_scr[0]) &&
            n < offsetof(struct oosiop_xfer, dataout_scr[OOSIOP_NSG * 2])) {
                n -= offsetof(struct oosiop_xfer, dataout_scr[0]);
                n >>= 3;
                OOSIOP_DOUTSCR_SYNC(sc, cb,
                    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
                for (i = 0; i <= n; i++)
                        len += le32toh(cb->xfer->dataout_scr[i * 2]) &
                            0x00ffffff;
                OOSIOP_DOUTSCR_SYNC(sc, cb,
                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

                dfifo = oosiop_read_1(sc, OOSIOP_DFIFO);
                dbc += ((dfifo & OOSIOP_DFIFO_BO) - (dbc & OOSIOP_DFIFO_BO)) &
                    OOSIOP_DFIFO_BO;

                sstat1 = oosiop_read_1(sc, OOSIOP_SSTAT1);
                if (sstat1 & OOSIOP_SSTAT1_OLF)
                        dbc++;
                if ((sc->sc_tgt[cb->id].sxfer != 0) &&
                    (sstat1 & OOSIOP_SSTAT1_ORF) != 0)
                        dbc++;

                oosiop_clear_fifo(sc);
        } else {
                printf("%s: phase mismatch addr=%08x\n",
                    device_xname(sc->sc_dev),
                    oosiop_read_4(sc, OOSIOP_DSP) - 8);
                oosiop_clear_fifo(sc);
                return;
        }

        len -= dbc;
        if (len) {
                cb->curdp += len;
                oosiop_setup_sgdma(sc, cb);
        }
}

static void
oosiop_setup_syncxfer(struct oosiop_softc *sc)
{
        int id;

        id = sc->sc_curcb->id;
        if (sc->sc_chip != OOSIOP_700)
                oosiop_write_1(sc, OOSIOP_SBCL, sc->sc_tgt[id].scf);

        oosiop_write_1(sc, OOSIOP_SXFER, sc->sc_tgt[id].sxfer);
}

static void
oosiop_set_syncparam(struct oosiop_softc *sc, int id, int period, int offset)
{
        int i, p;
        struct scsipi_xfer_mode xm;

        xm.xm_target = id;
        xm.xm_mode = 0;
        xm.xm_period = 0;
        xm.xm_offset = 0;

        if (offset == 0) {
                /* Asynchronous */
                sc->sc_tgt[id].scf = 0;
                sc->sc_tgt[id].sxfer = 0;
        } else {
                /* Synchronous */
                if (sc->sc_chip == OOSIOP_700) {
                        for (i = 4; i < 12; i++) {
                                p = oosiop_period(sc, i, sc->sc_ccf);
                                if (p >= period)
                                        break;
                        }
                        if (i == 12) {
                                printf("%s: target %d period too large\n",
                                    device_xname(sc->sc_dev), id);
                                i = 11; /* XXX */
                        }
                        sc->sc_tgt[id].scf = 0;
                        sc->sc_tgt[id].sxfer = ((i - 4) << 4) | offset;
                } else {
                        for (i = 0; i < NSYNCTBL; i++) {
                                p = oosiop_period(sc, synctbl[i].tp + 4,
                                    (synctbl[i].scf + 1) * 5);
                                if (p >= period)
                                        break;
                        }
                        if (i == NSYNCTBL) {
                                printf("%s: target %d period too large\n",
                                    device_xname(sc->sc_dev), id);
                                i = NSYNCTBL - 1;       /* XXX */
                        }
                        sc->sc_tgt[id].scf = synctbl[i].scf;
                        sc->sc_tgt[id].sxfer = (synctbl[i].tp << 4) | offset;
                }

                xm.xm_mode |= PERIPH_CAP_SYNC;
                xm.xm_period = period;
                xm.xm_offset = offset;
        }

        scsipi_async_event(&sc->sc_channel, ASYNC_EVENT_XFER_MODE, &xm);
}

static void
oosiop_minphys(struct buf *bp)
{

        if (bp->b_bcount > OOSIOP_MAX_XFER)
                bp->b_bcount = OOSIOP_MAX_XFER;
        minphys(bp);
}

static void
oosiop_scsipi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req,
    void *arg)
{
        struct scsipi_xfer *xs;
        struct oosiop_softc *sc;
        struct oosiop_cb *cb;
        struct oosiop_xfer *xfer;
        struct scsipi_xfer_mode *xm;
        int s, err;

        sc = device_private(chan->chan_adapter->adapt_dev);

        switch (req) {
        case ADAPTER_REQ_RUN_XFER:
                xs = arg;

                s = splbio();
                cb = TAILQ_FIRST(&sc->sc_free_cb);
                TAILQ_REMOVE(&sc->sc_free_cb, cb, chain);
                splx(s);

                cb->xs = xs;
                cb->flags = 0;
                cb->id = xs->xs_periph->periph_target;
                cb->lun = xs->xs_periph->periph_lun;
                cb->curdp = 0;
                cb->savedp = 0;
                xfer = cb->xfer;

                /* Setup SCSI command buffer DMA */
                err = bus_dmamap_load(sc->sc_dmat, cb->cmddma, xs->cmd,
                    xs->cmdlen, NULL, ((xs->xs_control & XS_CTL_NOSLEEP) ?
                    BUS_DMA_NOWAIT : BUS_DMA_WAITOK) | BUS_DMA_WRITE);
                if (err) {
                        printf("%s: unable to load cmd DMA map: %d",
                            device_xname(sc->sc_dev), err);
                        xs->error = XS_RESOURCE_SHORTAGE;
                        TAILQ_INSERT_TAIL(&sc->sc_free_cb, cb, chain);
                        scsipi_done(xs);
                        return;
                }
                bus_dmamap_sync(sc->sc_dmat, cb->cmddma, 0, xs->cmdlen,
                    BUS_DMASYNC_PREWRITE);

                /* Setup data buffer DMA */
                if (xs->xs_control & (XS_CTL_DATA_IN | XS_CTL_DATA_OUT)) {
                        err = bus_dmamap_load(sc->sc_dmat, cb->datadma,
                            xs->data, xs->datalen, NULL,
                            ((xs->xs_control & XS_CTL_NOSLEEP) ?
                            BUS_DMA_NOWAIT : BUS_DMA_WAITOK) |
                            BUS_DMA_STREAMING |
                            ((xs->xs_control & XS_CTL_DATA_IN) ? BUS_DMA_READ :
                            BUS_DMA_WRITE));
                        if (err) {
                                printf("%s: unable to load data DMA map: %d",
                                    device_xname(sc->sc_dev), err);
                                xs->error = XS_RESOURCE_SHORTAGE;
                                bus_dmamap_unload(sc->sc_dmat, cb->cmddma);
                                TAILQ_INSERT_TAIL(&sc->sc_free_cb, cb, chain);
                                scsipi_done(xs);
                                return;
                        }
                        bus_dmamap_sync(sc->sc_dmat, cb->datadma,
                            0, xs->datalen,
                            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
                }

                oosiop_setup_sgdma(sc, cb);

                /* Setup msgout buffer */
                OOSIOP_XFERMSG_SYNC(sc, cb,
                   BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
                xfer->msgout[0] = MSG_IDENTIFY(cb->lun,
                    (xs->xs_control & XS_CTL_REQSENSE) == 0);
                cb->msgoutlen = 1;

                if (sc->sc_tgt[cb->id].flags & TGTF_SYNCNEG) {
                        /* Send SDTR */
                        xfer->msgout[1] = MSG_EXTENDED;
                        xfer->msgout[2] = MSG_EXT_SDTR_LEN;
                        xfer->msgout[3] = MSG_EXT_SDTR;
                        xfer->msgout[4] = sc->sc_minperiod;
                        xfer->msgout[5] = OOSIOP_MAX_OFFSET;
                        cb->msgoutlen = 6;
                        sc->sc_tgt[cb->id].flags &= ~TGTF_SYNCNEG;
                        sc->sc_tgt[cb->id].flags |= TGTF_WAITSDTR;
                }

                xfer->status = SCSI_OOSIOP_NOSTATUS;

                OOSIOP_XFERMSG_SYNC(sc, cb,
                    BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

                s = splbio();

                TAILQ_INSERT_TAIL(&sc->sc_cbq, cb, chain);

                if (!sc->sc_active) {
                        /* Abort script to start selection */
                        oosiop_write_1(sc, OOSIOP_ISTAT, OOSIOP_ISTAT_ABRT);
                }
                if (xs->xs_control & XS_CTL_POLL) {
                        /* Poll for command completion */
                        while ((xs->xs_status & XS_STS_DONE) == 0) {
                                delay(1000);
                                oosiop_intr(sc);
                        }
                }

                splx(s);

                return;

        case ADAPTER_REQ_GROW_RESOURCES:
                return;

        case ADAPTER_REQ_SET_XFER_MODE:
                xm = arg;
                if (xm->xm_mode & PERIPH_CAP_SYNC)
                        sc->sc_tgt[xm->xm_target].flags |= TGTF_SYNCNEG;
                else
                        oosiop_set_syncparam(sc, xm->xm_target, 0, 0);

                return;
        }
}

static void
oosiop_done(struct oosiop_softc *sc, struct oosiop_cb *cb)
{
        struct scsipi_xfer *xs;

        xs = cb->xs;
        if (cb == sc->sc_curcb)
                sc->sc_curcb = NULL;
        if (cb == sc->sc_lastcb)
                sc->sc_lastcb = NULL;
        sc->sc_tgt[cb->id].nexus = NULL;

        callout_stop(&xs->xs_callout);

        bus_dmamap_sync(sc->sc_dmat, cb->cmddma, 0, xs->cmdlen,
            BUS_DMASYNC_POSTWRITE);
        bus_dmamap_unload(sc->sc_dmat, cb->cmddma);

        if (xs->datalen > 0) {
                bus_dmamap_sync(sc->sc_dmat, cb->datadma, 0, xs->datalen,
                    BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(sc->sc_dmat, cb->datadma);
        }

        xs->status = cb->xfer->status;
        xs->resid = 0;  /* XXX */

        if (cb->flags & CBF_SELTOUT)
                xs->error = XS_SELTIMEOUT;
        else if (cb->flags & CBF_TIMEOUT)
                xs->error = XS_TIMEOUT;
        else switch (xs->status) {
        case SCSI_OK:
                xs->error = XS_NOERROR;
                break;

        case SCSI_BUSY:
        case SCSI_CHECK:
                xs->error = XS_BUSY;
                break;
        case SCSI_OOSIOP_NOSTATUS:
                /* the status byte was not updated, cmd was aborted. */
                xs->error = XS_SELTIMEOUT;
                break;

        default:
                xs->error = XS_RESET;
                break;
        }

        scsipi_done(xs);

        /* Put it on the free list. */
        TAILQ_INSERT_TAIL(&sc->sc_free_cb, cb, chain);
}

static void
oosiop_timeout(void *arg)
{
        struct oosiop_cb *cb;
        struct scsipi_periph *periph;
        struct oosiop_softc *sc;
        int s;

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

        s = splbio();

        cb->flags |= CBF_TIMEOUT;
        oosiop_done(sc, cb);

        splx(s);
}

static void
oosiop_reset(struct oosiop_softc *sc)
{
        int i, s;

        s = splbio();

        /* Stop SCRIPTS processor */
        oosiop_write_1(sc, OOSIOP_ISTAT, OOSIOP_ISTAT_ABRT);
        delay(100);
        oosiop_write_1(sc, OOSIOP_ISTAT, 0);

        /* Reset the chip */
        oosiop_write_1(sc, OOSIOP_DCNTL, sc->sc_dcntl | OOSIOP_DCNTL_RST);
        delay(100);
        oosiop_write_1(sc, OOSIOP_DCNTL, sc->sc_dcntl);
        delay(10000);

        /* Set up various chip parameters */
        oosiop_write_1(sc, OOSIOP_SCNTL0, OOSIOP_ARB_FULL | OOSIOP_SCNTL0_EPG);
        oosiop_write_1(sc, OOSIOP_SCNTL1, OOSIOP_SCNTL1_ESR);
        oosiop_write_1(sc, OOSIOP_DCNTL, sc->sc_dcntl);
        oosiop_write_1(sc, OOSIOP_DMODE, OOSIOP_DMODE_BL_8);
        oosiop_write_1(sc, OOSIOP_SCID, OOSIOP_SCID_VALUE(sc->sc_id));
        oosiop_write_1(sc, OOSIOP_DWT, 0xff);   /* Enable DMA timeout */
        oosiop_write_1(sc, OOSIOP_CTEST7, 0);
        oosiop_write_1(sc, OOSIOP_SXFER, 0);

        /* Clear all interrupts */
        (void)oosiop_read_1(sc, OOSIOP_SSTAT0);
        (void)oosiop_read_1(sc, OOSIOP_SSTAT1);
        (void)oosiop_read_1(sc, OOSIOP_DSTAT);

        /* Enable interrupts */
        oosiop_write_1(sc, OOSIOP_SIEN,
            OOSIOP_SIEN_M_A | OOSIOP_SIEN_STO | OOSIOP_SIEN_SGE |
            OOSIOP_SIEN_UDC | OOSIOP_SIEN_RST | OOSIOP_SIEN_PAR);
        oosiop_write_1(sc, OOSIOP_DIEN,
            OOSIOP_DIEN_ABRT | OOSIOP_DIEN_SSI | OOSIOP_DIEN_SIR |
            OOSIOP_DIEN_WTD | OOSIOP_DIEN_IID);

        /* Set target state to asynchronous */
        for (i = 0; i < OOSIOP_NTGT; i++) {
                sc->sc_tgt[i].flags = 0;
                sc->sc_tgt[i].scf = 0;
                sc->sc_tgt[i].sxfer = 0;
        }

        splx(s);
}

static void
oosiop_reset_bus(struct oosiop_softc *sc)
{
        int s, i;

        s = splbio();

        /* Assert SCSI RST */
        oosiop_write_1(sc, OOSIOP_SCNTL1, OOSIOP_SCNTL1_RST);
        delay(25);      /* Reset hold time (25us) */
        oosiop_write_1(sc, OOSIOP_SCNTL1, 0);

        /* Remove all nexuses */
        for (i = 0; i < OOSIOP_NTGT; i++) {
                if (sc->sc_tgt[i].nexus) {
                        sc->sc_tgt[i].nexus->xfer->status =
                            SCSI_OOSIOP_NOSTATUS; /* XXX */
                        oosiop_done(sc, sc->sc_tgt[i].nexus);
                }
        }

        sc->sc_curcb = NULL;

        delay(250000);  /* Reset to selection (250ms) */

        splx(s);
}

/*
 * interrupt handler
 */
int
oosiop_intr(struct oosiop_softc *sc)
{
        struct oosiop_cb *cb;
        uint32_t dcmd;
        int timeout;
        uint8_t istat, dstat, sstat0;

        istat = oosiop_read_1(sc, OOSIOP_ISTAT);

        if ((istat & (OOSIOP_ISTAT_SIP | OOSIOP_ISTAT_DIP)) == 0)
                return (0);

        sc->sc_nextdsp = Ent_wait_reselect;

        /* DMA interrupts */
        if (istat & OOSIOP_ISTAT_DIP) {
                oosiop_write_1(sc, OOSIOP_ISTAT, 0);

                dstat = oosiop_read_1(sc, OOSIOP_DSTAT);

                if (dstat & OOSIOP_DSTAT_ABRT) {
                        sc->sc_nextdsp = oosiop_read_4(sc, OOSIOP_DSP) -
                            sc->sc_scrbase - 8;

                        if (sc->sc_nextdsp == Ent_p_resel_msgin_move &&
                            (oosiop_read_1(sc, OOSIOP_SBCL) & OOSIOP_ACK)) {
                                if ((dstat & OOSIOP_DSTAT_DFE) == 0)
                                        oosiop_flush_fifo(sc);
                                sc->sc_nextdsp += 8;
                        }
                }

                if (dstat & OOSIOP_DSTAT_SSI) {
                        sc->sc_nextdsp = oosiop_read_4(sc, OOSIOP_DSP) -
                            sc->sc_scrbase;
                        printf("%s: single step %08x\n",
                            device_xname(sc->sc_dev), sc->sc_nextdsp);
                }

                if (dstat & OOSIOP_DSTAT_SIR) {
                        if ((dstat & OOSIOP_DSTAT_DFE) == 0)
                                oosiop_flush_fifo(sc);
                        oosiop_scriptintr(sc);
                }

                if (dstat & OOSIOP_DSTAT_WTD) {
                        printf("%s: DMA time out\n", device_xname(sc->sc_dev));
                        oosiop_reset(sc);
                }

                if (dstat & OOSIOP_DSTAT_IID) {
                        dcmd = oosiop_read_4(sc, OOSIOP_DBC);
                        if ((dcmd & 0xf8000000) == 0x48000000) {
                                printf("%s: REQ asserted on WAIT DISCONNECT\n",
                                    device_xname(sc->sc_dev));
                                sc->sc_nextdsp = Ent_phasedispatch; /* XXX */
                        } else {
                                printf("%s: invalid SCRIPTS instruction "
                                    "addr=%08x dcmd=%08x dsps=%08x\n",
                                    device_xname(sc->sc_dev),
                                    oosiop_read_4(sc, OOSIOP_DSP) - 8, dcmd,
                                    oosiop_read_4(sc, OOSIOP_DSPS));
                                oosiop_reset(sc);
                                OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_POSTWRITE);
                                oosiop_load_script(sc);
                        }
                }

                if ((dstat & OOSIOP_DSTAT_DFE) == 0)
                        oosiop_clear_fifo(sc);
        }

        /* SCSI interrupts */
        if (istat & OOSIOP_ISTAT_SIP) {
                if (istat & OOSIOP_ISTAT_DIP)
                        delay(1);
                sstat0 = oosiop_read_1(sc, OOSIOP_SSTAT0);

                if (sstat0 & OOSIOP_SSTAT0_M_A) {
                        /* SCSI phase mismatch during MOVE operation */
                        oosiop_phasemismatch(sc);
                        sc->sc_nextdsp = Ent_phasedispatch;
                }

                if (sstat0 & OOSIOP_SSTAT0_STO) {
                        if (sc->sc_curcb) {
                                sc->sc_curcb->flags |= CBF_SELTOUT;
                                oosiop_done(sc, sc->sc_curcb);
                        }
                }

                if (sstat0 & OOSIOP_SSTAT0_SGE) {
                        printf("%s: SCSI gross error\n",
                            device_xname(sc->sc_dev));
                        oosiop_reset(sc);
                }

                if (sstat0 & OOSIOP_SSTAT0_UDC) {
                        /* XXX */
                        if (sc->sc_curcb) {
                                printf("%s: unexpected disconnect\n",
                                    device_xname(sc->sc_dev));
                                oosiop_done(sc, sc->sc_curcb);
                        }
                }

                if (sstat0 & OOSIOP_SSTAT0_RST)
                        oosiop_reset(sc);

                if (sstat0 & OOSIOP_SSTAT0_PAR)
                        printf("%s: parity error\n", device_xname(sc->sc_dev));
        }

        /* Start next command if available */
        if (sc->sc_nextdsp == Ent_wait_reselect && TAILQ_FIRST(&sc->sc_cbq)) {
                cb = sc->sc_curcb = TAILQ_FIRST(&sc->sc_cbq);
                TAILQ_REMOVE(&sc->sc_cbq, cb, chain);
                sc->sc_tgt[cb->id].nexus = cb;

                oosiop_setup_dma(sc);
                oosiop_setup_syncxfer(sc);
                sc->sc_lastcb = cb;
                sc->sc_nextdsp = Ent_start_select;

                /* Schedule timeout */
                if ((cb->xs->xs_control & XS_CTL_POLL) == 0) {
                        timeout = mstohz(cb->xs->timeout) + 1;
                        callout_reset(&cb->xs->xs_callout, timeout,
                            oosiop_timeout, cb);
                }
        }

        sc->sc_active = (sc->sc_nextdsp != Ent_wait_reselect);

        /* Restart script */
        oosiop_write_4(sc, OOSIOP_DSP, sc->sc_nextdsp + sc->sc_scrbase);

        return (1);
}

static void
oosiop_scriptintr(struct oosiop_softc *sc)
{
        struct oosiop_cb *cb;
        uint32_t icode;
        uint32_t dsp;
        int i;
        uint8_t sfbr, resid, resmsg;

        cb = sc->sc_curcb;
        icode = oosiop_read_4(sc, OOSIOP_DSPS);

        switch (icode) {
        case A_int_done:
                if (cb)
                        oosiop_done(sc, cb);
                break;

        case A_int_msgin:
                if (cb)
                        oosiop_msgin(sc, cb);
                break;

        case A_int_extmsg:
                /* extended message in DMA setup request */
                sfbr = oosiop_read_1(sc, OOSIOP_SFBR);
                OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_POSTWRITE);
                oosiop_fixup_move(sc, Ent_p_extmsgin_move, sfbr,
                    cb->xferdma->dm_segs[0].ds_addr +
                    offsetof(struct oosiop_xfer, msgin[2]));
                OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_PREWRITE);
                sc->sc_nextdsp = Ent_rcv_extmsg;
                break;

        case A_int_resel:
                /* reselected */
                resid = oosiop_read_1(sc, OOSIOP_SFBR);
                for (i = 0; i < OOSIOP_NTGT; i++)
                        if (resid & (1 << i))
                                break;
                if (i == OOSIOP_NTGT) {
                        printf("%s: missing reselection target id\n",
                            device_xname(sc->sc_dev));
                        break;
                }
                sc->sc_resid = i;
                sc->sc_nextdsp = Ent_wait_resel_identify;

                if (cb) {
                        /* Current command was lost arbitration */
                        sc->sc_tgt[cb->id].nexus = NULL;
                        TAILQ_INSERT_HEAD(&sc->sc_cbq, cb, chain);
                        sc->sc_curcb = NULL;
                }

                break;

        case A_int_res_id:
                cb = sc->sc_tgt[sc->sc_resid].nexus;
                resmsg = oosiop_read_1(sc, OOSIOP_SFBR);
                if (MSG_ISIDENTIFY(resmsg) && cb &&
                    (resmsg & MSG_IDENTIFY_LUNMASK) == cb->lun) {
                        sc->sc_curcb = cb;
                        if (cb != sc->sc_lastcb) {
                                oosiop_setup_dma(sc);
                                oosiop_setup_syncxfer(sc);
                                sc->sc_lastcb = cb;
                        }
                        if (cb->curdp != cb->savedp) {
                                cb->curdp = cb->savedp;
                                oosiop_setup_sgdma(sc, cb);
                        }
                        sc->sc_nextdsp = Ent_ack_msgin;
                } else {
                        /* Reselection from invalid target */
                        oosiop_reset_bus(sc);
                }
                break;

        case A_int_resfail:
                /* reselect failed */
                break;

        case A_int_disc:
                /* disconnected */
                sc->sc_curcb = NULL;
                break;

        case A_int_err:
                /* generic error */
                dsp = oosiop_read_4(sc, OOSIOP_DSP);
                printf("%s: script error at 0x%08x\n",
                    device_xname(sc->sc_dev), dsp - 8);
                sc->sc_curcb = NULL;
                break;

        case DATAIN_TRAP:
                printf("%s: unexpected datain\n", device_xname(sc->sc_dev));
                /* XXX: need to reset? */
                break;

        case DATAOUT_TRAP:
                printf("%s: unexpected dataout\n", device_xname(sc->sc_dev));
                /* XXX: need to reset? */
                break;

        default:
                printf("%s: unknown intr code %08x\n",
                    device_xname(sc->sc_dev), icode);
                break;
        }
}

static void
oosiop_msgin(struct oosiop_softc *sc, struct oosiop_cb *cb)
{
        struct oosiop_xfer *xfer;
        int msgout;

        xfer = cb->xfer;
        sc->sc_nextdsp = Ent_ack_msgin;
        msgout = 0;

        OOSIOP_XFERMSG_SYNC(sc, cb,
            BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);

        switch (xfer->msgin[0]) {
        case MSG_EXTENDED:
                switch (xfer->msgin[2]) {
                case MSG_EXT_SDTR:
                        if (sc->sc_tgt[cb->id].flags & TGTF_WAITSDTR) {
                                /* Host initiated SDTR */
                                sc->sc_tgt[cb->id].flags &= ~TGTF_WAITSDTR;
                        } else {
                                /* Target initiated SDTR */
                                if (xfer->msgin[3] < sc->sc_minperiod)
                                        xfer->msgin[3] = sc->sc_minperiod;
                                if (xfer->msgin[4] > OOSIOP_MAX_OFFSET)
                                        xfer->msgin[4] = OOSIOP_MAX_OFFSET;
                                xfer->msgout[0] = MSG_EXTENDED;
                                xfer->msgout[1] = MSG_EXT_SDTR_LEN;
                                xfer->msgout[2] = MSG_EXT_SDTR;
                                xfer->msgout[3] = xfer->msgin[3];
                                xfer->msgout[4] = xfer->msgin[4];
                                cb->msgoutlen = 5;
                                msgout = 1;
                        }
                        oosiop_set_syncparam(sc, cb->id, (int)xfer->msgin[3],
                            (int)xfer->msgin[4]);
                        oosiop_setup_syncxfer(sc);
                        break;

                default:
                        /* Reject message */
                        xfer->msgout[0] = MSG_MESSAGE_REJECT;
                        cb->msgoutlen = 1;
                        msgout = 1;
                        break;
                }
                break;

        case MSG_SAVEDATAPOINTER:
                cb->savedp = cb->curdp;
                break;

        case MSG_RESTOREPOINTERS:
                if (cb->curdp != cb->savedp) {
                        cb->curdp = cb->savedp;
                        oosiop_setup_sgdma(sc, cb);
                }
                break;

        case MSG_MESSAGE_REJECT:
                if (sc->sc_tgt[cb->id].flags & TGTF_WAITSDTR) {
                        /* SDTR rejected */
                        sc->sc_tgt[cb->id].flags &= ~TGTF_WAITSDTR;
                        oosiop_set_syncparam(sc, cb->id, 0, 0);
                        oosiop_setup_syncxfer(sc);
                }
                break;

        default:
                /* Reject message */
                xfer->msgout[0] = MSG_MESSAGE_REJECT;
                cb->msgoutlen = 1;
                msgout = 1;
        }

        OOSIOP_XFERMSG_SYNC(sc, cb,
            BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

        if (msgout) {
                OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_POSTWRITE);
                oosiop_fixup_move(sc, Ent_p_msgout_move, cb->msgoutlen,
                    cb->xferdma->dm_segs[0].ds_addr +
                    offsetof(struct oosiop_xfer, msgout[0]));
                OOSIOP_SCRIPT_SYNC(sc, BUS_DMASYNC_PREWRITE);
                sc->sc_nextdsp = Ent_sendmsg;
        }
}