xref: /src/sys/dev/ic/adv.c

/*	$NetBSD: adv.c,v 1.3 1998/09/09 05:28:58 thorpej Exp $	*/

/*
 * Generic driver for the Advanced Systems Inc. SCSI controllers
 *
 * Copyright (c) 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Author: Baldassare Dante Profeta <dante (at) 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the NetBSD
 *    Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE 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/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/user.h>

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

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/pmap.h>

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

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

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

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


static void adv_enqueue __P((ASC_SOFTC *, struct scsipi_xfer *, int));
static struct scsipi_xfer *adv_dequeue __P((ASC_SOFTC *));

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

static u_int8_t *adv_alloc_overrunbuf __P((char *dvname, bus_dma_tag_t));

static int adv_scsi_cmd __P((struct scsipi_xfer *));
static void advminphys __P((struct buf *));
static void adv_narrow_isr_callback __P((ASC_SOFTC *, ASC_QDONE_INFO *));

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


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


struct scsipi_adapter adv_switch =
{
	adv_scsi_cmd,		/* called to start/enqueue a SCSI command */
	advminphys,		/* to limit the transfer to max device can do */
	0,			/* IT SEEMS IT IS NOT USED YET */
	0,			/* as above... */
};


/* the below structure is so we have a default dev struct for out link struct */
struct scsipi_device adv_dev =
{
	NULL,			/* Use default error handler */
	NULL,			/* have a queue, served by this */
	NULL,			/* have no async handler */
	NULL,			/* Use default 'done' routine */
};


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


/******************************************************************************/
/*                            scsipi_xfer queue routines                      */
/******************************************************************************/


/*
 * Insert a scsipi_xfer into the software queue.  We overload xs->free_list
 * to avoid having to allocate additional resources (since we're used
 * only during resource shortages anyhow.
 */
static void
adv_enqueue(sc, xs, infront)
	ASC_SOFTC      *sc;
	struct scsipi_xfer *xs;
	int             infront;
{

	if (infront || sc->sc_queue.lh_first == NULL) {
		if (sc->sc_queue.lh_first == NULL)
			sc->sc_queuelast = xs;
		LIST_INSERT_HEAD(&sc->sc_queue, xs, free_list);
		return;
	}
	LIST_INSERT_AFTER(sc->sc_queuelast, xs, free_list);
	sc->sc_queuelast = xs;
}


/*
 * Pull a scsipi_xfer off the front of the software queue.
 */
static struct scsipi_xfer *
adv_dequeue(sc)
	ASC_SOFTC      *sc;
{
	struct scsipi_xfer *xs;

	xs = sc->sc_queue.lh_first;
	LIST_REMOVE(xs, free_list);

	if (sc->sc_queue.lh_first == NULL)
		sc->sc_queuelast = NULL;

	return (xs);
}


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


static int
adv_alloc_ccbs(sc)
	ASC_SOFTC      *sc;
{
	bus_dma_segment_t seg;
	int             error, rseg;

	/*
         * Allocate the control blocks.
         */
	if ((error = bus_dmamem_alloc(sc->sc_dmat, sizeof(struct adv_control),
			   NBPG, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) {
		printf("%s: unable to allocate control structures,"
		       " error = %d\n", sc->sc_dev.dv_xname, error);
		return (error);
	}
	if ((error = bus_dmamem_map(sc->sc_dmat, &seg, rseg,
		   sizeof(struct adv_control), (caddr_t *) & sc->sc_control,
				 BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
		printf("%s: unable to map control structures, error = %d\n",
		       sc->sc_dev.dv_xname, 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) {
		printf("%s: unable to create control DMA map, error = %d\n",
		       sc->sc_dev.dv_xname, 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) {
		printf("%s: unable to load control DMA map, error = %d\n",
		       sc->sc_dev.dv_xname, error);
		return (error);
	}
	return (0);
}


/*
 * 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(sc, ccbstore, count)
	ASC_SOFTC      *sc;
	ADV_CCB        *ccbstore;
	int             count;
{
	ADV_CCB        *ccb;
	int             i, error;

	bzero(ccbstore, sizeof(ADV_CCB) * count);
	for (i = 0; i < count; i++) {
		ccb = &ccbstore[i];
		if ((error = adv_init_ccb(sc, ccb)) != 0) {
			printf("%s: unable to initialize ccb, error = %d\n",
			       sc->sc_dev.dv_xname, 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(sc, ccb)
	ASC_SOFTC      *sc;
	ADV_CCB        *ccb;
{
	int             s;

	s = splbio();

	adv_reset_ccb(ccb);
	TAILQ_INSERT_HEAD(&sc->sc_free_ccb, ccb, chain);

	/*
         * If there were none, wake anybody waiting for one to come free,
         * starting with queued entries.
         */
	if (ccb->chain.tqe_next == 0)
		wakeup(&sc->sc_free_ccb);

	splx(s);
}


static void
adv_reset_ccb(ccb)
	ADV_CCB        *ccb;
{

	ccb->flags = 0;
}


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

	/*
         * 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) {
		printf("%s: unable to create DMA map, error = %d\n",
		       sc->sc_dev.dv_xname, error);
		return (error);
	}
	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(sc, flags)
	ASC_SOFTC      *sc;
	int             flags;
{
	ADV_CCB        *ccb = 0;
	int             s;

	s = splbio();

	/*
         * If we can and have to, sleep waiting for one to come free
         * but only if we can't allocate a new one.
         */
	for (;;) {
		ccb = sc->sc_free_ccb.tqh_first;
		if (ccb) {
			TAILQ_REMOVE(&sc->sc_free_ccb, ccb, chain);
			break;
		}
		if ((flags & SCSI_NOSLEEP) != 0)
			goto out;

		tsleep(&sc->sc_free_ccb, PRIBIO, "advccb", 0);
	}

	ccb->flags |= CCB_ALLOC;

out:
	splx(s);
	return (ccb);
}


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

	while ((ccb = sc->sc_waiting_ccb.tqh_first) != NULL) {
		if (ccb->flags & CCB_WATCHDOG)
			untimeout(adv_watchdog, ccb);

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

		if ((ccb->xs->flags & SCSI_POLL) == 0)
			timeout(adv_timeout, ccb, (ccb->timeout * hz) / 1000);
	}
}


/******************************************************************************/
/*                      DMA able memory allocation routines                   */
/******************************************************************************/


/*
 * Allocate a DMA able memory for overrun_buffer.
 * This memory can be safely shared among all the AdvanSys boards.
 */
u_int8_t       *
adv_alloc_overrunbuf(dvname, dmat)
	char           *dvname;
	bus_dma_tag_t   dmat;
{
	static u_int8_t *overrunbuf = NULL;

	bus_dmamap_t    ovrbuf_dmamap;
	bus_dma_segment_t seg;
	int             rseg, error;


	/*
         * if an overrun buffer has been already allocated don't allocate it
         * again. Instead return the address of the allocated buffer.
         */
	if (overrunbuf)
		return (overrunbuf);


	if ((error = bus_dmamem_alloc(dmat, ASC_OVERRUN_BSIZE,
			   NBPG, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) {
		printf("%s: unable to allocate overrun buffer, error = %d\n",
		       dvname, error);
		return (0);
	}
	if ((error = bus_dmamem_map(dmat, &seg, rseg, ASC_OVERRUN_BSIZE,
	(caddr_t *) & overrunbuf, BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
		printf("%s: unable to map overrun buffer, error = %d\n",
		       dvname, error);

		bus_dmamem_free(dmat, &seg, 1);
		return (0);
	}
	if ((error = bus_dmamap_create(dmat, ASC_OVERRUN_BSIZE, 1,
	      ASC_OVERRUN_BSIZE, 0, BUS_DMA_NOWAIT, &ovrbuf_dmamap)) != 0) {
		printf("%s: unable to create overrun buffer DMA map,"
		       " error = %d\n", dvname, error);

		bus_dmamem_unmap(dmat, overrunbuf, ASC_OVERRUN_BSIZE);
		bus_dmamem_free(dmat, &seg, 1);
		return (0);
	}
	if ((error = bus_dmamap_load(dmat, ovrbuf_dmamap, overrunbuf,
			   ASC_OVERRUN_BSIZE, NULL, BUS_DMA_NOWAIT)) != 0) {
		printf("%s: unable to load overrun buffer DMA map,"
		       " error = %d\n", dvname, error);

		bus_dmamap_destroy(dmat, ovrbuf_dmamap);
		bus_dmamem_unmap(dmat, overrunbuf, ASC_OVERRUN_BSIZE);
		bus_dmamem_free(dmat, &seg, 1);
		return (0);
	}
	return (overrunbuf);
}


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


int
adv_init(sc)
	ASC_SOFTC      *sc;
{
	int             warn;

	if (ASC_IS_NARROW_BOARD(sc)) {
		if (!AscFindSignature(sc->sc_iot, sc->sc_ioh))
			panic("adv_init: adv_find_signature failed");

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

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

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

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

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

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

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

			default:
				printf("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) {
			printf("%s -set: ", sc->sc_dev.dv_xname);
			switch (warn) {
			case ASC_WARN_CMD_QNG_CONFLICT:
				printf("tag queuing enabled w/o disconnects\n");
				break;

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

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

		if (!(sc->overrun_buf = adv_alloc_overrunbuf(sc->sc_dev.dv_xname,
							     sc->sc_dmat))) {
			return (1);
		}
	} else
		//IS_WIDE_BOARD
	{
		printf("%s: Wide boards are not supported yet\n",
		       sc->sc_dev.dv_xname);
		return (1);
	}

	return (0);
}


void
adv_attach(sc)
	ASC_SOFTC      *sc;
{
	int             i, error;

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

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

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

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

		default:
			panic("%s: unable to initialize board RISC chip",
			      sc->sc_dev.dv_xname);
		}
	} else
		//Wide Boards
	{
		/* ToDo */
	}


	/*
         * fill in the prototype scsipi_link.
         */
	sc->sc_link.scsipi_scsi.channel = SCSI_CHANNEL_ONLY_ONE;
	sc->sc_link.adapter_softc = sc;
	sc->sc_link.scsipi_scsi.adapter_target = sc->chip_scsi_id;
	sc->sc_link.adapter = &adv_switch;
	sc->sc_link.device = &adv_dev;
	sc->sc_link.openings = 4;
	sc->sc_link.scsipi_scsi.max_target = ASC_IS_NARROW_BOARD(sc) ? 7 : 15;
	sc->sc_link.type = BUS_SCSI;


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


	/*
         * Allocate the Control Blocks.
         */
	error = adv_alloc_ccbs(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) {
		printf("%s: unable to create control blocks\n",
		       sc->sc_dev.dv_xname);
		return; /* (ENOMEM) */ ;
	} else if (i != ADV_MAX_CCB) {
		printf("%s: WARNING: only %d of %d control blocks created\n",
		       sc->sc_dev.dv_xname, i, ADV_MAX_CCB);
	}
	config_found(&sc->sc_dev, &sc->sc_link, scsiprint);
}


static void
advminphys(bp)
	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 int
adv_scsi_cmd(xs)
	struct scsipi_xfer *xs;
{
	struct scsipi_link *sc_link = xs->sc_link;
	ASC_SOFTC      *sc = sc_link->adapter_softc;
	bus_dma_tag_t   dmat = sc->sc_dmat;
	ADV_CCB        *ccb;
	int             s, flags, error, nsegs;
	int             fromqueue = 1, dontqueue = 0;


	s = splbio();		/* protect the queue */

	/*
         * If we're running the queue from adv_done(), we've been
         * called with the first queue entry as our argument.
         */
	if (xs == sc->sc_queue.lh_first) {
		xs = adv_dequeue(sc);
		fromqueue = 1;
	} else {

		/* Polled requests can't be queued for later. */
		dontqueue = xs->flags & SCSI_POLL;

		/*
                 * If there are jobs in the queue, run them first.
                 */
		if (sc->sc_queue.lh_first != NULL) {
			/*
                         * If we can't queue, we have to abort, since
                         * we have to preserve order.
                         */
			if (dontqueue) {
				splx(s);
				xs->error = XS_DRIVER_STUFFUP;
				return (TRY_AGAIN_LATER);
			}
			/*
                         * Swap with the first queue entry.
                         */
			adv_enqueue(sc, xs, 0);
			xs = adv_dequeue(sc);
			fromqueue = 1;
		}
	}


	/*
         * get a ccb to use. If the transfer
         * is from a buf (possibly from interrupt time)
         * then we can't allow it to sleep
         */

	flags = xs->flags;
	if ((ccb = adv_get_ccb(sc, flags)) == NULL) {
		/*
                 * If we can't queue, we lose.
                 */
		if (dontqueue) {
			splx(s);
			xs->error = XS_DRIVER_STUFFUP;
			return (TRY_AGAIN_LATER);
		}
		/*
                 * Stuff ourselves into the queue, in front
                 * if we came off in the first place.
                 */
		adv_enqueue(sc, xs, fromqueue);
		splx(s);
		return (SUCCESSFULLY_QUEUED);
	}
	splx(s);		/* done playing with the queue */

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

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

	ccb->scsiq.q2.ccb_ptr = (ulong) ccb;

	ccb->scsiq.cdbptr = &xs->cmd->opcode;
	ccb->scsiq.q2.cdb_len = xs->cmdlen;
	ccb->scsiq.q1.target_id = ASC_TID_TO_TARGET_ID(sc_link->scsipi_scsi.target);
	ccb->scsiq.q1.target_lun = sc_link->scsipi_scsi.lun;
	ccb->scsiq.q2.target_ix = ASC_TIDLUN_TO_IX(sc_link->scsipi_scsi.target,
						   sc_link->scsipi_scsi.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 scsipi_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[sc_link->scsipi_scsi.target]++;
	if ((sc->reqcnt[sc_link->scsipi_scsi.target] > 0) &&
	    (sc->reqcnt[sc_link->scsipi_scsi.target] % 255) == 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 & SCSI_NOSLEEP) ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK);
		} else
#endif				/* TFS */
		{
			error = bus_dmamap_load(dmat,
			      ccb->dmamap_xfer, xs->data, xs->datalen, NULL,
						(flags & SCSI_NOSLEEP) ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK);
		}

		if (error) {
			if (error == EFBIG) {
				printf("%s: adv_scsi_cmd, more than %d dma"
				       " segments\n",
				       sc->sc_dev.dv_xname, ASC_MAX_SG_LIST);
			} else {
				printf("%s: adv_scsi_cmd, error %d loading"
				       " dma map\n",
				       sc->sc_dev.dv_xname, error);
			}

			xs->error = XS_DRIVER_STUFFUP;
			adv_free_ccb(sc, ccb);
			return (COMPLETE);
		}
		bus_dmamap_sync(dmat, ccb->dmamap_xfer, 0,
				ccb->dmamap_xfer->dm_mapsize,
			      (flags & SCSI_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;
	}

	s = splbio();
	adv_queue_ccb(sc, ccb);
	splx(s);

	/*
         * Usually return SUCCESSFULLY QUEUED
         */
	if ((flags & SCSI_POLL) == 0)
		return (SUCCESSFULLY_QUEUED);

	/*
         * If we can't use interrupts, poll on completion
         */
	if (adv_poll(sc, xs, ccb->timeout)) {
		adv_timeout(ccb);
		if (adv_poll(sc, xs, ccb->timeout))
			adv_timeout(ccb);
	}
	return (COMPLETE);
}


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

	if (ASC_IS_NARROW_BOARD(sc)) {
		AscISR(sc);
	} else
		//Wide Boards
	{
		/* ToDo AdvISR */
	}

	/*
         * If there are queue entries in the software queue, try to
         * run the first one.  We should be more or less guaranteed
         * to succeed, since we just freed a CCB.
         *
         * NOTE: adv_scsi_cmd() relies on our calling it with
         * the first entry in the queue.
         */
	if ((xs = sc->sc_queue.lh_first) != NULL)
		(void) adv_scsi_cmd(xs);

	return (1);
}


/*
 * Poll a particular unit, looking for a particular xs
 */
static int
adv_poll(sc, xs, count)
	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->flags & ITSDONE)
			return (0);
		delay(1000);	/* only happens in boot so ok */
		count--;
	}
	return (1);
}


static void
adv_timeout(arg)
	void           *arg;
{
	ADV_CCB        *ccb = arg;
	struct scsipi_xfer *xs = ccb->xs;
	struct scsipi_link *sc_link = xs->sc_link;
	ASC_SOFTC      *sc = sc_link->adapter_softc;
	int             s;

	scsi_print_addr(sc_link);
	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, (u_int32_t) 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(arg)
	void           *arg;
{
	ADV_CCB        *ccb = arg;
	struct scsipi_xfer *xs = ccb->xs;
	struct scsipi_link *sc_link = xs->sc_link;
	ASC_SOFTC      *sc = sc_link->adapter_softc;
	int             s;

	s = splbio();

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

	splx(s);
}


/******************************************************************************/
/*                  NARROW and WIDE 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(sc, qdonep)
	ASC_SOFTC      *sc;
	ASC_QDONE_INFO *qdonep;
{
	bus_dma_tag_t   dmat = sc->sc_dmat;
	ADV_CCB        *ccb = (ADV_CCB *) qdonep->d2.ccb_ptr;
	struct scsipi_xfer *xs = ccb->xs;
	struct scsipi_sense_data *s1, *s2;


	untimeout(adv_timeout, ccb);

	/*
         * 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->flags & SCSI_DATA_IN) ? BUS_DMASYNC_POSTREAD :
				BUS_DMASYNC_POSTWRITE);
		bus_dmamap_unload(dmat, ccb->dmamap_xfer);
	}
	if ((ccb->flags & CCB_ALLOC) == 0) {
		printf("%s: exiting ccb not allocated!\n", sc->sc_dev.dv_xname);
		Debugger();
		return;
	}
	/*
         * 'qdonep' contains the command's ending status.
         */
	switch (qdonep->d3.done_stat) {
	case ASC_QD_NO_ERROR:
		switch (qdonep->d3.host_stat) {
		case ASC_QHSTA_NO_ERROR:
			xs->error = XS_NOERROR;
			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->sc_link->scsipi_scsi.lun == 0) &&
		    (xs->datalen - qdonep->remain_bytes) >= 8) {
			AscInquiryHandling(sc,
				      xs->sc_link->scsipi_scsi.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;

		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);
	xs->flags |= ITSDONE;
	scsipi_done(xs);
}