/*      $NetBSD: adv.c,v 1.53 2022/09/25 18:43:32 thorpej Exp $ */

/*
 * Generic driver for the Advanced Systems Inc. Narrow SCSI controllers
 *
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Author: Baldassare Dante Profeta <dante@mclink.it>
 *
 * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: adv.c,v 1.53 2022/09/25 18:43:32 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/proc.h>

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

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

#include <dev/ic/advlib.h>
#include <dev/ic/adv.h>

#ifndef DDB
#define Debugger()      panic("should call debugger here (adv.c)")
#endif /* ! DDB */


/* #define ASC_DEBUG */

/******************************************************************************/


static int adv_alloc_control_data(ASC_SOFTC *);
static void adv_free_control_data(ASC_SOFTC *);
static int adv_create_ccbs(ASC_SOFTC *, ADV_CCB *, int);
static void adv_free_ccb(ASC_SOFTC *, ADV_CCB *);
static void adv_reset_ccb(ADV_CCB *);
static int adv_init_ccb(ASC_SOFTC *, ADV_CCB *);
static ADV_CCB *adv_get_ccb(ASC_SOFTC *);
static void adv_queue_ccb(ASC_SOFTC *, ADV_CCB *);
static void adv_start_ccbs(ASC_SOFTC *);


static void adv_scsipi_request(struct scsipi_channel *,
        scsipi_adapter_req_t, void *);
static void advminphys(struct buf *);
static void adv_narrow_isr_callback(ASC_SOFTC *, ASC_QDONE_INFO *);

static int adv_poll(ASC_SOFTC *, struct scsipi_xfer *, int);
static void adv_timeout(void *);
static void adv_watchdog(void *);


/******************************************************************************/

#define ADV_ABORT_TIMEOUT       2000    /* time to wait for abort (mSec) */
#define ADV_WATCH_TIMEOUT       1000    /* time to wait for watchdog (mSec) */

/******************************************************************************/
/*                             Control Blocks routines                        */
/******************************************************************************/


static int
adv_alloc_control_data(ASC_SOFTC *sc)
{
        int error;

        /*
        * Allocate the control blocks.
         */
        if ((error = bus_dmamem_alloc(sc->sc_dmat, sizeof(struct adv_control),
                           PAGE_SIZE, 0, &sc->sc_control_seg, 1,
                           &sc->sc_control_nsegs, BUS_DMA_NOWAIT)) != 0) {
                aprint_error_dev(sc->sc_dev, "unable to allocate control "
                    "structures, error = %d\n", error);
                return (error);
        }
        if ((error = bus_dmamem_map(sc->sc_dmat, &sc->sc_control_seg,
                           sc->sc_control_nsegs, sizeof(struct adv_control),
                           (void **) & sc->sc_control,
                           BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
                aprint_error_dev(sc->sc_dev,
                    "unable to map control structures, error = %d\n", error);
                return (error);
        }
        /*
         * Create and load the DMA map used for the control blocks.
         */
        if ((error = bus_dmamap_create(sc->sc_dmat, sizeof(struct adv_control),
                           1, sizeof(struct adv_control), 0, BUS_DMA_NOWAIT,
                                       &sc->sc_dmamap_control)) != 0) {
                aprint_error_dev(sc->sc_dev,
                    "unable to create control DMA map, error = %d\n", error);
                return (error);
        }
        if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_dmamap_control,
                           sc->sc_control, sizeof(struct adv_control), NULL,
                                     BUS_DMA_NOWAIT)) != 0) {
                aprint_error_dev(sc->sc_dev,
                    "unable to load control DMA map, error = %d\n", error);
                return (error);
        }

        /*
         * Initialize the overrun_buf address.
         */
        sc->overrun_buf = sc->sc_dmamap_control->dm_segs[0].ds_addr +
            offsetof(struct adv_control, overrun_buf);

        return (0);
}

static void
adv_free_control_data(ASC_SOFTC *sc)
{

        bus_dmamap_unload(sc->sc_dmat, sc->sc_dmamap_control);
        bus_dmamap_destroy(sc->sc_dmat, sc->sc_dmamap_control);
        sc->sc_dmamap_control = NULL;

        bus_dmamem_unmap(sc->sc_dmat, (void *) sc->sc_control,
            sizeof(struct adv_control));
        bus_dmamem_free(sc->sc_dmat, &sc->sc_control_seg,
            sc->sc_control_nsegs);
}

/*
 * Create a set of ccbs and add them to the free list.  Called once
 * by adv_init().  We return the number of CCBs successfully created.
 */
static int
adv_create_ccbs(ASC_SOFTC *sc, ADV_CCB *ccbstore, int count)
{
        ADV_CCB        *ccb;
        int             i, error;

        memset(ccbstore, 0, sizeof(ADV_CCB) * count);
        for (i = 0; i < count; i++) {
                ccb = &ccbstore[i];
                if ((error = adv_init_ccb(sc, ccb)) != 0) {
                        aprint_error_dev(sc->sc_dev,
                            "unable to initialize ccb, error = %d\n", error);
                        return (i);
                }
                TAILQ_INSERT_TAIL(&sc->sc_free_ccb, ccb, chain);
        }

        return (i);
}


/*
 * A ccb is put onto the free list.
 */
static void
adv_free_ccb(ASC_SOFTC *sc, ADV_CCB *ccb)
{
        int             s;

        s = splbio();
        adv_reset_ccb(ccb);
        TAILQ_INSERT_HEAD(&sc->sc_free_ccb, ccb, chain);
        splx(s);
}


static void
adv_reset_ccb(ADV_CCB *ccb)
{

        ccb->flags = 0;
}


static int
adv_init_ccb(ASC_SOFTC *sc, ADV_CCB *ccb)
{
        int     hashnum, error;

        callout_init(&ccb->ccb_watchdog, 0);

        /*
         * Create the DMA map for this CCB.
         */
        error = bus_dmamap_create(sc->sc_dmat,
                                  (ASC_MAX_SG_LIST - 1) * PAGE_SIZE,
                         ASC_MAX_SG_LIST, (ASC_MAX_SG_LIST - 1) * PAGE_SIZE,
                   0, BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &ccb->dmamap_xfer);
        if (error) {
                aprint_error_dev(sc->sc_dev,
                    "unable to create DMA map, error = %d\n", error);
                return (error);
        }

        /*
         * put in the phystokv hash table
         * Never gets taken out.
         */
        ccb->hashkey = sc->sc_dmamap_control->dm_segs[0].ds_addr +
            ADV_CCB_OFF(ccb);
        hashnum = CCB_HASH(ccb->hashkey);
        ccb->nexthash = sc->sc_ccbhash[hashnum];
        sc->sc_ccbhash[hashnum] = ccb;

        adv_reset_ccb(ccb);
        return (0);
}


/*
 * Get a free ccb
 *
 * If there are none, see if we can allocate a new one
 */
static ADV_CCB *
adv_get_ccb(ASC_SOFTC *sc)
{
        ADV_CCB        *ccb = 0;
        int             s;

        s = splbio();
        ccb = TAILQ_FIRST(&sc->sc_free_ccb);
        if (ccb != NULL) {
                TAILQ_REMOVE(&sc->sc_free_ccb, ccb, chain);
                ccb->flags |= CCB_ALLOC;
        }
        splx(s);
        return (ccb);
}


/*
 * Given a physical address, find the ccb that it corresponds to.
 */
ADV_CCB *
adv_ccb_phys_kv(ASC_SOFTC *sc, u_long ccb_phys)
{
        int hashnum = CCB_HASH(ccb_phys);
        ADV_CCB *ccb = sc->sc_ccbhash[hashnum];

        while (ccb) {
                if (ccb->hashkey == ccb_phys)
                        break;
                ccb = ccb->nexthash;
        }
        return (ccb);
}


/*
 * Queue a CCB to be sent to the controller, and send it if possible.
 */
static void
adv_queue_ccb(ASC_SOFTC *sc, ADV_CCB *ccb)
{

        TAILQ_INSERT_TAIL(&sc->sc_waiting_ccb, ccb, chain);

        adv_start_ccbs(sc);
}


static void
adv_start_ccbs(ASC_SOFTC *sc)
{
        ADV_CCB        *ccb;

        while ((ccb = sc->sc_waiting_ccb.tqh_first) != NULL) {
                if (ccb->flags & CCB_WATCHDOG)
                        callout_stop(&ccb->ccb_watchdog);

                if (AscExeScsiQueue(sc, &ccb->scsiq) == ASC_BUSY) {
                        ccb->flags |= CCB_WATCHDOG;
                        callout_reset(&ccb->ccb_watchdog,
                            (ADV_WATCH_TIMEOUT * hz) / 1000,
                            adv_watchdog, ccb);
                        break;
                }
                TAILQ_REMOVE(&sc->sc_waiting_ccb, ccb, chain);

                if ((ccb->xs->xs_control & XS_CTL_POLL) == 0)
                        callout_reset(&ccb->xs->xs_callout,
                            mstohz(ccb->timeout), adv_timeout, ccb);
        }
}


/******************************************************************************/
/*                         SCSI layer interfacing routines                    */
/******************************************************************************/


int
adv_init(ASC_SOFTC *sc)
{
        int             warn;

        if (!AscFindSignature(sc->sc_iot, sc->sc_ioh)) {
                aprint_error("adv_init: failed to find signature\n");
                return (1);
        }

        /*
         * Read the board configuration
         */
        AscInitASC_SOFTC(sc);
        warn = AscInitFromEEP(sc);
        if (warn) {
                aprint_error_dev(sc->sc_dev, "-get: ");
                switch (warn) {
                case -1:
                        aprint_normal("Chip is not halted\n");
                        break;

                case -2:
                        aprint_normal("Couldn't get MicroCode Start"
                               " address\n");
                        break;

                case ASC_WARN_IO_PORT_ROTATE:
                        aprint_normal("I/O port address modified\n");
                        break;

                case ASC_WARN_AUTO_CONFIG:
                        aprint_normal("I/O port increment switch enabled\n");
                        break;

                case ASC_WARN_EEPROM_CHKSUM:
                        aprint_normal("EEPROM checksum error\n");
                        break;

                case ASC_WARN_IRQ_MODIFIED:
                        aprint_normal("IRQ modified\n");
                        break;

                case ASC_WARN_CMD_QNG_CONFLICT:
                        aprint_normal("tag queuing enabled w/o disconnects\n");
                        break;

                default:
                        aprint_normal("unknown warning %d\n", warn);
                }
        }
        if (sc->scsi_reset_wait > ASC_MAX_SCSI_RESET_WAIT)
                sc->scsi_reset_wait = ASC_MAX_SCSI_RESET_WAIT;

        /*
         * Modify the board configuration
         */
        warn = AscInitFromASC_SOFTC(sc);
        if (warn) {
                aprint_error_dev(sc->sc_dev, "-set: ");
                switch (warn) {
                case ASC_WARN_CMD_QNG_CONFLICT:
                        aprint_normal("tag queuing enabled w/o disconnects\n");
                        break;

                case ASC_WARN_AUTO_CONFIG:
                        aprint_normal("I/O port increment switch enabled\n");
                        break;

                default:
                        aprint_normal("unknown warning %d\n", warn);
                }
        }
        sc->isr_callback = adv_narrow_isr_callback;

        return (0);
}


void
adv_attach(ASC_SOFTC *sc)
{
        struct scsipi_adapter *adapt = &sc->sc_adapter;
        struct scsipi_channel *chan = &sc->sc_channel;
        int             i, error;

        /*
         * Initialize board RISC chip and enable interrupts.
         */
        switch (AscInitDriver(sc)) {
        case 0:
                /* AllOK */
                break;

        case 1:
                panic("%s: bad signature", device_xname(sc->sc_dev));
                break;

        case 2:
                panic("%s: unable to load MicroCode",
                      device_xname(sc->sc_dev));
                break;

        case 3:
                panic("%s: unable to initialize MicroCode",
                      device_xname(sc->sc_dev));
                break;

        default:
                panic("%s: unable to initialize board RISC chip",
                      device_xname(sc->sc_dev));
        }

        /*
         * Fill in the scsipi_adapter.
         */
        memset(adapt, 0, sizeof(*adapt));
        adapt->adapt_dev = sc->sc_dev;
        adapt->adapt_nchannels = 1;
        /* adapt_openings initialized below */
        /* adapt_max_periph initialized below */
        adapt->adapt_request = adv_scsipi_request;
        adapt->adapt_minphys = advminphys;

        /*
         * Fill in the scsipi_channel.
         */
        memset(chan, 0, sizeof(*chan));
        chan->chan_adapter = adapt;
        chan->chan_bustype = &scsi_bustype;
        chan->chan_channel = 0;
        chan->chan_ntargets = 8;
        chan->chan_nluns = 8;
        chan->chan_id = sc->chip_scsi_id;

        TAILQ_INIT(&sc->sc_free_ccb);
        TAILQ_INIT(&sc->sc_waiting_ccb);

        /*
         * Allocate the Control Blocks and the overrun buffer.
         */
        error = adv_alloc_control_data(sc);
        if (error)
                return; /* (error) */

        /*
         * Create and initialize the Control Blocks.
         */
        i = adv_create_ccbs(sc, sc->sc_control->ccbs, ADV_MAX_CCB);
        if (i == 0) {
                aprint_error_dev(sc->sc_dev,
                    "unable to create control blocks\n");
                return; /* (ENOMEM) */ ;
        } else if (i != ADV_MAX_CCB) {
                aprint_error_dev(sc->sc_dev,
                    "WARNING: only %d of %d control blocks created\n",
                    i, ADV_MAX_CCB);
        }

        adapt->adapt_openings = i;
        adapt->adapt_max_periph = adapt->adapt_openings;

        sc->sc_child = config_found(sc->sc_dev, chan, scsiprint, CFARGS_NONE);
}

int
adv_detach(ASC_SOFTC *sc, int flags)
{
        int rv = 0;

        if (sc->sc_child != NULL)
                rv = config_detach(sc->sc_child, flags);

        adv_free_control_data(sc);

        return (rv);
}

static void
advminphys(struct buf *bp)
{

        if (bp->b_bcount > ((ASC_MAX_SG_LIST - 1) * PAGE_SIZE))
                bp->b_bcount = ((ASC_MAX_SG_LIST - 1) * PAGE_SIZE);
        minphys(bp);
}


/*
 * start a scsi operation given the command and the data address.  Also needs
 * the unit, target and lu.
 */

static void
adv_scsipi_request(struct scsipi_channel *chan, scsipi_adapter_req_t req,
    void *arg)
{
        struct scsipi_xfer *xs;
        struct scsipi_periph *periph;
        ASC_SOFTC      *sc = device_private(chan->chan_adapter->adapt_dev);
        bus_dma_tag_t   dmat = sc->sc_dmat;
        ADV_CCB        *ccb;
        int             s, flags, error, nsegs;

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

                /*
                 * Get a CCB to use.
                 */
                ccb = adv_get_ccb(sc);
#ifdef DIAGNOSTIC
                /*
                 * This should never happen as we track the resources
                 * in the mid-layer.
                 */
                if (ccb == NULL) {
                        scsipi_printaddr(periph);
                        printf("unable to allocate ccb\n");
                        panic("adv_scsipi_request");
                }
#endif

                ccb->xs = xs;
                ccb->timeout = xs->timeout;

                /*
                 * Build up the request
                 */
                memset(&ccb->scsiq, 0, sizeof(ASC_SCSI_Q));

                ccb->scsiq.q2.ccb_ptr =
                    sc->sc_dmamap_control->dm_segs[0].ds_addr +
                    ADV_CCB_OFF(ccb);

                ccb->scsiq.cdbptr = &xs->cmd->opcode;
                ccb->scsiq.q2.cdb_len = xs->cmdlen;
                ccb->scsiq.q1.target_id =
                    ASC_TID_TO_TARGET_ID(periph->periph_target);
                ccb->scsiq.q1.target_lun = periph->periph_lun;
                ccb->scsiq.q2.target_ix =
                    ASC_TIDLUN_TO_IX(periph->periph_target,
                    periph->periph_lun);
                ccb->scsiq.q1.sense_addr =
                    sc->sc_dmamap_control->dm_segs[0].ds_addr +
                    ADV_CCB_OFF(ccb) + offsetof(struct adv_ccb, scsi_sense);
                ccb->scsiq.q1.sense_len = sizeof(struct scsi_sense_data);

                /*
                 * If there are any outstanding requests for the current
                 * target, then every 255th request send an ORDERED request.
                 * This heuristic tries to retain the benefit of request
                 * sorting while preventing request starvation. 255 is the
                 * max number of tags or pending commands a device may have
                 * outstanding.
                 */
                sc->reqcnt[periph->periph_target]++;
                if (((sc->reqcnt[periph->periph_target] > 0) &&
                    (sc->reqcnt[periph->periph_target] % 255) == 0) ||
                    xs->bp == NULL || (xs->bp->b_flags & B_ASYNC) == 0) {
                        ccb->scsiq.q2.tag_code = M2_QTAG_MSG_ORDERED;
                } else {
                        ccb->scsiq.q2.tag_code = M2_QTAG_MSG_SIMPLE;
                }

                if (xs->datalen) {
                        /*
                         * Map the DMA transfer.
                         */
#ifdef TFS
                        if (flags & SCSI_DATA_UIO) {
                                error = bus_dmamap_load_uio(dmat,
                                    ccb->dmamap_xfer, (struct uio *) xs->data,
                                    ((flags & XS_CTL_NOSLEEP) ? BUS_DMA_NOWAIT :
                                     BUS_DMA_WAITOK) | BUS_DMA_STREAMING |
                                     ((flags & XS_CTL_DATA_IN) ? BUS_DMA_READ :
                                      BUS_DMA_WRITE));
                        } else
#endif /* TFS */
                        {
                                error = bus_dmamap_load(dmat, ccb->dmamap_xfer,
                                    xs->data, xs->datalen, NULL,
                                    ((flags & XS_CTL_NOSLEEP) ? BUS_DMA_NOWAIT :
                                     BUS_DMA_WAITOK) | BUS_DMA_STREAMING |
                                     ((flags & XS_CTL_DATA_IN) ? BUS_DMA_READ :
                                      BUS_DMA_WRITE));
                        }

                        switch (error) {
                        case 0:
                                break;


                        case ENOMEM:
                        case EAGAIN:
                                xs->error = XS_RESOURCE_SHORTAGE;
                                goto out_bad;

                        default:
                                xs->error = XS_DRIVER_STUFFUP;
                                if (error == EFBIG) {
                                        aprint_error_dev(sc->sc_dev,
                                            "adv_scsi_cmd, more than %d"
                                            " DMA segments\n",
                                            ASC_MAX_SG_LIST);
                                } else {
                                        aprint_error_dev(sc->sc_dev,
                                            "adv_scsi_cmd, error %d"
                                            " loading DMA map\n", error);
                                }

out_bad:
                                adv_free_ccb(sc, ccb);
                                scsipi_done(xs);
                                return;
                        }
                        bus_dmamap_sync(dmat, ccb->dmamap_xfer, 0,
                            ccb->dmamap_xfer->dm_mapsize,
                            (flags & XS_CTL_DATA_IN) ?
                             BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE);

                        memset(&ccb->sghead, 0, sizeof(ASC_SG_HEAD));

                        for (nsegs = 0;
                             nsegs < ccb->dmamap_xfer->dm_nsegs; nsegs++) {
                                ccb->sghead.sg_list[nsegs].addr =
                                    ccb->dmamap_xfer->dm_segs[nsegs].ds_addr;
                                ccb->sghead.sg_list[nsegs].bytes =
                                    ccb->dmamap_xfer->dm_segs[nsegs].ds_len;
                        }

                        ccb->sghead.entry_cnt = ccb->scsiq.q1.sg_queue_cnt =
                            ccb->dmamap_xfer->dm_nsegs;

                        ccb->scsiq.q1.cntl |= ASC_QC_SG_HEAD;
                        ccb->scsiq.sg_head = &ccb->sghead;
                        ccb->scsiq.q1.data_addr = 0;
                        ccb->scsiq.q1.data_cnt = 0;
                } else {
                        /*
                         * No data xfer, use non S/G values.
                         */
                        ccb->scsiq.q1.data_addr = 0;
                        ccb->scsiq.q1.data_cnt = 0;
                }

#ifdef ASC_DEBUG
                printf("id = %d, lun = %d, cmd = %d, ccb = 0x%lX\n",
                    periph->periph_target,
                    periph->periph_lun, xs->cmd->opcode,
                    (unsigned long)ccb);
#endif
                s = splbio();
                adv_queue_ccb(sc, ccb);
                splx(s);

                if ((flags & XS_CTL_POLL) == 0)
                        return;

                /* Not allowed to use interrupts, poll for completion. */
                if (adv_poll(sc, xs, ccb->timeout)) {
                        adv_timeout(ccb);
                        if (adv_poll(sc, xs, ccb->timeout))
                                adv_timeout(ccb);
                }
                return;

        case ADAPTER_REQ_GROW_RESOURCES:
                /* XXX Not supported. */
                return;

        case ADAPTER_REQ_SET_XFER_MODE:
            {
                /*
                 * We can't really set the mode, but we know how to
                 * query what the firmware negotiated.
                 */
                struct scsipi_xfer_mode *xm = arg;
                u_int8_t sdtr_data;
                ASC_SCSI_BIT_ID_TYPE tid_bit;

                tid_bit = ASC_TIX_TO_TARGET_ID(xm->xm_target);

                xm->xm_mode = 0;
                xm->xm_period = 0;
                xm->xm_offset = 0;

                if (sc->init_sdtr & tid_bit) {
                        xm->xm_mode |= PERIPH_CAP_SYNC;
                        sdtr_data = sc->sdtr_data[xm->xm_target];
                        xm->xm_period =
                            sc->sdtr_period_tbl[(sdtr_data >> 4) &
                            (sc->max_sdtr_index - 1)];
                        xm->xm_offset = sdtr_data & ASC_SYN_MAX_OFFSET;
                }

                if (sc->use_tagged_qng & tid_bit)
                        xm->xm_mode |= PERIPH_CAP_TQING;

                scsipi_async_event(chan, ASYNC_EVENT_XFER_MODE, xm);
                return;
            }
        }
}

int
adv_intr(void *arg)
{
        ASC_SOFTC      *sc = arg;

#ifdef ASC_DEBUG
        int int_pend = FALSE;

        if (ASC_IS_INT_PENDING(sc->sc_iot, sc->sc_ioh)) {
                int_pend = TRUE;
                printf("ISR - ");
        }
#endif
        AscISR(sc);
#ifdef ASC_DEBUG
        if(int_pend)
                printf("\n");
#endif

        return (1);
}


/*
 * Poll a particular unit, looking for a particular xs
 */
static int
adv_poll(ASC_SOFTC *sc, struct scsipi_xfer *xs, int count)
{

        /* timeouts are in msec, so we loop in 1000 usec cycles */
        while (count) {
                adv_intr(sc);
                if (xs->xs_status & XS_STS_DONE)
                        return (0);
                delay(1000);    /* only happens in boot so ok */
                count--;
        }
        return (1);
}


static void
adv_timeout(void *arg)
{
        ADV_CCB        *ccb = arg;
        struct scsipi_xfer *xs = ccb->xs;
        struct scsipi_periph *periph = xs->xs_periph;
        ASC_SOFTC      *sc =
            device_private(periph->periph_channel->chan_adapter->adapt_dev);
        int             s;

        scsipi_printaddr(periph);
        printf("timed out");

        s = splbio();

        /*
         * If it has been through before, then a previous abort has failed,
         * don't try abort again, reset the bus instead.
         */
        if (ccb->flags & CCB_ABORT) {
                /* abort timed out */
                printf(" AGAIN. Resetting Bus\n");
                /* Lets try resetting the bus! */
                if (AscResetBus(sc) == ASC_ERROR) {
                        ccb->timeout = sc->scsi_reset_wait;
                        adv_queue_ccb(sc, ccb);
                }
        } else {
                /* abort the operation that has timed out */
                printf("\n");
                AscAbortCCB(sc, ccb);
                ccb->xs->error = XS_TIMEOUT;
                ccb->timeout = ADV_ABORT_TIMEOUT;
                ccb->flags |= CCB_ABORT;
                adv_queue_ccb(sc, ccb);
        }

        splx(s);
}


static void
adv_watchdog(void *arg)
{
        ADV_CCB        *ccb = arg;
        struct scsipi_xfer *xs = ccb->xs;
        struct scsipi_periph *periph = xs->xs_periph;
        ASC_SOFTC      *sc =
            device_private(periph->periph_channel->chan_adapter->adapt_dev);
        int             s;

        s = splbio();

        ccb->flags &= ~CCB_WATCHDOG;
        adv_start_ccbs(sc);

        splx(s);
}


/******************************************************************************/
/*                      NARROW boards Interrupt callbacks                     */
/******************************************************************************/


/*
 * adv_narrow_isr_callback() - Second Level Interrupt Handler called by AscISR()
 *
 * Interrupt callback function for the Narrow SCSI Asc Library.
 */
static void
adv_narrow_isr_callback(ASC_SOFTC *sc, ASC_QDONE_INFO *qdonep)
{
        bus_dma_tag_t   dmat = sc->sc_dmat;
        ADV_CCB        *ccb;
        struct scsipi_xfer *xs;
        struct scsi_sense_data *s1, *s2;


        ccb = adv_ccb_phys_kv(sc, qdonep->d2.ccb_ptr);
        xs = ccb->xs;

#ifdef ASC_DEBUG
        printf(" - ccb=0x%lx, id=%d, lun=%d, cmd=%d, ",
                        (unsigned long)ccb,
                        xs->xs_periph->periph_target,
                        xs->xs_periph->periph_lun, xs->cmd->opcode);
#endif
        callout_stop(&ccb->xs->xs_callout);

        /*
         * If we were a data transfer, unload the map that described
         * the data buffer.
         */
        if (xs->datalen) {
                bus_dmamap_sync(dmat, ccb->dmamap_xfer, 0,
                                ccb->dmamap_xfer->dm_mapsize,
                         (xs->xs_control & XS_CTL_DATA_IN) ?
                         BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(dmat, ccb->dmamap_xfer);
        }
        if ((ccb->flags & CCB_ALLOC) == 0) {
                aprint_error_dev(sc->sc_dev, "exiting ccb not allocated!\n");
                Debugger();
                return;
        }
        /*
         * 'qdonep' contains the command's ending status.
         */
#ifdef ASC_DEBUG
        printf("d_s=%d, h_s=%d", qdonep->d3.done_stat, qdonep->d3.host_stat);
#endif
        switch (qdonep->d3.done_stat) {
        case ASC_QD_NO_ERROR:
                switch (qdonep->d3.host_stat) {
                case ASC_QHSTA_NO_ERROR:
                        xs->error = XS_NOERROR;
                        /*
                         * XXX
                         * According to the original Linux driver, xs->resid
                         * should be qdonep->remain_bytes. However, its value
                         * is bogus, which seems like a H/W bug. The best thing
                         * we can do would be to ignore it, assuming that all
                         * data has been successfully transferred...
                         */
                        xs->resid = 0;
                        break;

                default:
                        /* QHSTA error occurred */
                        xs->error = XS_DRIVER_STUFFUP;
                        break;
                }

                /*
                 * If an INQUIRY command completed successfully, then call
                 * the AscInquiryHandling() function to patch bugged boards.
                 */
                if ((xs->cmd->opcode == SCSICMD_Inquiry) &&
                    (xs->xs_periph->periph_lun == 0) &&
                    (xs->datalen - qdonep->remain_bytes) >= 8) {
                        AscInquiryHandling(sc,
                                      xs->xs_periph->periph_target & 0x7,
                                           (ASC_SCSI_INQUIRY *) xs->data);
                }
                break;

        case ASC_QD_WITH_ERROR:
                switch (qdonep->d3.host_stat) {
                case ASC_QHSTA_NO_ERROR:
                        if (qdonep->d3.scsi_stat == SS_CHK_CONDITION) {
                                s1 = &ccb->scsi_sense;
                                s2 = &xs->sense.scsi_sense;
                                *s2 = *s1;
                                xs->error = XS_SENSE;
                        } else {
                                xs->error = XS_DRIVER_STUFFUP;
                        }
                        break;

                case ASC_QHSTA_M_SEL_TIMEOUT:
                        xs->error = XS_SELTIMEOUT;
                        break;

                default:
                        /* QHSTA error occurred */
                        xs->error = XS_DRIVER_STUFFUP;
                        break;
                }
                break;

        case ASC_QD_ABORTED_BY_HOST:
        default:
                xs->error = XS_DRIVER_STUFFUP;
                break;
        }

        adv_free_ccb(sc, ccb);
        scsipi_done(xs);
}