aic7xxx.c

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		       ahc_inb(ahc, SCB_CONTROL));
		printf("SCSIBUSL == 0x%x, SCSISIGI == 0x%x\n",
		       ahc_inb(ahc, SCSIBUSL), ahc_inb(ahc, SCSISIGI));
		ahc_dump_card_state(ahc);
		panic("for safety");
		break;
	}
	default:
		printf("ahc_intr: seqint, "
		       "intstat == 0x%x, scsisigi = 0x%x\n",
		       intstat, ahc_inb(ahc, SCSISIGI));
		break;
	}
unpause:
	/*
	 *  The sequencer is paused immediately on
	 *  a SEQINT, so we should restart it when
	 *  we're done.
	 */
	ahc_unpause(ahc);
}

void
ahc_handle_scsiint(struct ahc_softc *ahc, u_int intstat)
{
	u_int	scb_index;
	u_int	status0;
	u_int	status;
	struct	scb *scb;
	char	cur_channel;
	char	intr_channel;

	/* Make sure the sequencer is in a safe location. */
	ahc_clear_critical_section(ahc);

	if ((ahc->features & AHC_TWIN) != 0
	 && ((ahc_inb(ahc, SBLKCTL) & SELBUSB) != 0))
		cur_channel = 'B';
	else
		cur_channel = 'A';
	intr_channel = cur_channel;

	if ((ahc->features & AHC_ULTRA2) != 0)
		status0 = ahc_inb(ahc, SSTAT0) & IOERR;
	else
		status0 = 0;
	status = ahc_inb(ahc, SSTAT1) & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
	if (status == 0 && status0 == 0) {
		if ((ahc->features & AHC_TWIN) != 0) {
			/* Try the other channel */
		 	ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) ^ SELBUSB);
			status = ahc_inb(ahc, SSTAT1)
			       & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
			intr_channel = (cur_channel == 'A') ? 'B' : 'A';
		}
		if (status == 0) {
			printf("%s: Spurious SCSI interrupt\n", ahc_name(ahc));
			ahc_outb(ahc, CLRINT, CLRSCSIINT);
			ahc_unpause(ahc);
			return;
		}
	}

	scb_index = ahc_inb(ahc, SCB_TAG);
	scb = ahc_lookup_scb(ahc, scb_index);
	if (scb != NULL
	 && (ahc_inb(ahc, SEQ_FLAGS) & IDENTIFY_SEEN) == 0)
		scb = NULL;

	if ((ahc->features & AHC_ULTRA2) != 0
	 && (status0 & IOERR) != 0) {
		int now_lvd;

		now_lvd = ahc_inb(ahc, SBLKCTL) & ENAB40;
		printf("%s: Transceiver State Has Changed to %s mode\n",
		       ahc_name(ahc), now_lvd ? "LVD" : "SE");
		ahc_outb(ahc, CLRSINT0, CLRIOERR);
		/*
		 * When transitioning to SE mode, the reset line
		 * glitches, triggering an arbitration bug in some
		 * Ultra2 controllers.  This bug is cleared when we
		 * assert the reset line.  Since a reset glitch has
		 * already occurred with this transition and a
		 * transceiver state change is handled just like
		 * a bus reset anyway, asserting the reset line
		 * ourselves is safe.
		 */
		ahc_reset_channel(ahc, intr_channel,
				 /*Initiate Reset*/now_lvd == 0);
	} else if ((status & SCSIRSTI) != 0) {
		printf("%s: Someone reset channel %c\n",
			ahc_name(ahc), intr_channel);
		if (intr_channel != cur_channel)
		 	ahc_outb(ahc, SBLKCTL, ahc_inb(ahc, SBLKCTL) ^ SELBUSB);
		ahc_reset_channel(ahc, intr_channel, /*Initiate Reset*/FALSE);
	} else if ((status & SCSIPERR) != 0) {
		/*
		 * Determine the bus phase and queue an appropriate message.
		 * SCSIPERR is latched true as soon as a parity error
		 * occurs.  If the sequencer acked the transfer that
		 * caused the parity error and the currently presented
		 * transfer on the bus has correct parity, SCSIPERR will
		 * be cleared by CLRSCSIPERR.  Use this to determine if
		 * we should look at the last phase the sequencer recorded,
		 * or the current phase presented on the bus.
		 */
		u_int mesg_out;
		u_int curphase;
		u_int errorphase;
		u_int lastphase;
		u_int scsirate;
		u_int i;
		u_int sstat2;

		lastphase = ahc_inb(ahc, LASTPHASE);
		curphase = ahc_inb(ahc, SCSISIGI) & PHASE_MASK;
		sstat2 = ahc_inb(ahc, SSTAT2);
		ahc_outb(ahc, CLRSINT1, CLRSCSIPERR);
		/*
		 * For all phases save DATA, the sequencer won't
		 * automatically ack a byte that has a parity error
		 * in it.  So the only way that the current phase
		 * could be 'data-in' is if the parity error is for
		 * an already acked byte in the data phase.  During
		 * synchronous data-in transfers, we may actually
		 * ack bytes before latching the current phase in
		 * LASTPHASE, leading to the discrepancy between
		 * curphase and lastphase.
		 */
		if ((ahc_inb(ahc, SSTAT1) & SCSIPERR) != 0
		 || curphase == P_DATAIN || curphase == P_DATAIN_DT)
			errorphase = curphase;
		else
			errorphase = lastphase;

		for (i = 0; i < num_phases; i++) {
			if (errorphase == ahc_phase_table[i].phase)
				break;
		}
		mesg_out = ahc_phase_table[i].mesg_out;
		if (scb != NULL)
			ahc_print_path(ahc, scb);
		else
			printf("%s:%c:%d: ", ahc_name(ahc), intr_channel,
			       SCSIID_TARGET(ahc, ahc_inb(ahc, SAVED_SCSIID)));
		scsirate = ahc_inb(ahc, SCSIRATE);
		printf("parity error detected %s. "
		       "SEQADDR(0x%x) SCSIRATE(0x%x)\n",
		       ahc_phase_table[i].phasemsg,
		       ahc_inb(ahc, SEQADDR0) | (ahc_inb(ahc, SEQADDR1) << 8),
		       scsirate);

		if ((ahc->features & AHC_DT) != 0) {

			if ((sstat2 & CRCVALERR) != 0)
				printf("\tCRC Value Mismatch\n");
			if ((sstat2 & CRCENDERR) != 0)
				printf("\tNo terminal CRC packet recevied\n");
			if ((sstat2 & CRCREQERR) != 0)
				printf("\tIllegal CRC packet request\n");
			if ((sstat2 & DUAL_EDGE_ERR) != 0)
				printf("\tUnexpected %sDT Data Phase\n",
				       (scsirate & SINGLE_EDGE) ? "" : "non-");
		}

		/*
		 * We've set the hardware to assert ATN if we   
		 * get a parity error on "in" phases, so all we  
		 * need to do is stuff the message buffer with
		 * the appropriate message.  "In" phases have set
		 * mesg_out to something other than MSG_NOP.
		 */
		if (mesg_out != MSG_NOOP) {
			if (ahc->msg_type != MSG_TYPE_NONE)
				ahc->send_msg_perror = TRUE;
			else
				ahc_outb(ahc, MSG_OUT, mesg_out);
		}
		/*
		 * Force a renegotiation with this target just in
		 * case we are out of sync for some external reason
		 * unknown (or unreported) by the target.
		 */
		ahc_force_renegotiation(ahc);
		ahc_outb(ahc, CLRINT, CLRSCSIINT);
		ahc_unpause(ahc);
	} else if ((status & SELTO) != 0) {
		u_int	scbptr;

		/* Stop the selection */
		ahc_outb(ahc, SCSISEQ, 0);

		/* No more pending messages */
		ahc_clear_msg_state(ahc);

		/* Clear interrupt state */
		ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENBUSFREE);
		ahc_outb(ahc, CLRSINT1, CLRSELTIMEO|CLRBUSFREE|CLRSCSIPERR);

		/*
		 * Although the driver does not care about the
		 * 'Selection in Progress' status bit, the busy
		 * LED does.  SELINGO is only cleared by a sucessfull
		 * selection, so we must manually clear it to insure
		 * the LED turns off just incase no future successful
		 * selections occur (e.g. no devices on the bus).
		 */
		ahc_outb(ahc, CLRSINT0, CLRSELINGO);

		scbptr = ahc_inb(ahc, WAITING_SCBH);
		ahc_outb(ahc, SCBPTR, scbptr);
		scb_index = ahc_inb(ahc, SCB_TAG);

		scb = ahc_lookup_scb(ahc, scb_index);
		if (scb == NULL) {
			printf("%s: ahc_intr - referenced scb not "
			       "valid during SELTO scb(%d, %d)\n",
			       ahc_name(ahc), scbptr, scb_index);
		} else {
			ahc_set_transaction_status(scb, CAM_SEL_TIMEOUT);
			ahc_freeze_devq(ahc, scb);
		}
		ahc_outb(ahc, CLRINT, CLRSCSIINT);
		/*
		 * Force a renegotiation with this target just in
		 * case the cable was pulled and will later be
		 * re-attached.  The target may forget its negotiation
		 * settings with us should it attempt to reselect
		 * during the interruption.  The target will not issue
		 * a unit attention in this case, so we must always
		 * renegotiate.
		 */
		ahc_force_renegotiation(ahc);
		ahc_restart(ahc);
	} else if ((status & BUSFREE) != 0
		&& (ahc_inb(ahc, SIMODE1) & ENBUSFREE) != 0) {
		u_int lastphase;
		u_int saved_scsiid;
		u_int saved_lun;
		u_int target;
		u_int initiator_role_id;
		char channel;
		int printerror;

		/*
		 * Clear our selection hardware as soon as possible.
		 * We may have an entry in the waiting Q for this target,
		 * that is affected by this busfree and we don't want to
		 * go about selecting the target while we handle the event.
		 */
		ahc_outb(ahc, SCSISEQ,
			 ahc_inb(ahc, SCSISEQ) & (ENSELI|ENRSELI|ENAUTOATNP));

		/*
		 * Disable busfree interrupts and clear the busfree
		 * interrupt status.  We do this here so that several
		 * bus transactions occur prior to clearing the SCSIINT
		 * latch.  It can take a bit for the clearing to take effect.
		 */
		ahc_outb(ahc, SIMODE1, ahc_inb(ahc, SIMODE1) & ~ENBUSFREE);
		ahc_outb(ahc, CLRSINT1, CLRBUSFREE|CLRSCSIPERR);

		/*
		 * Look at what phase we were last in.
		 * If its message out, chances are pretty good
		 * that the busfree was in response to one of
		 * our abort requests.
		 */
		lastphase = ahc_inb(ahc, LASTPHASE);
		saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
		saved_lun = ahc_inb(ahc, SAVED_LUN);
		target = SCSIID_TARGET(ahc, saved_scsiid);
		initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
		channel = SCSIID_CHANNEL(ahc, saved_scsiid);
		printerror = 1;

		if (lastphase == P_MESGOUT) {
			struct ahc_devinfo devinfo;
			u_int tag;

			ahc_fetch_devinfo(ahc, &devinfo);
			tag = SCB_LIST_NULL;
			if (ahc_sent_msg(ahc, AHCMSG_1B, MSG_ABORT_TAG, TRUE)
			 || ahc_sent_msg(ahc, AHCMSG_1B, MSG_ABORT, TRUE)) {
				if (ahc->msgout_buf[ahc->msgout_index - 1]
				 == MSG_ABORT_TAG)
					tag = scb->hscb->tag;
				ahc_print_path(ahc, scb);
				printf("SCB %d - Abort%s Completed.\n",
				       scb->hscb->tag, tag == SCB_LIST_NULL ?
				       "" : " Tag");
				ahc_abort_scbs(ahc, target, channel,
					       saved_lun, tag,
					       ROLE_INITIATOR,
					       CAM_REQ_ABORTED);
				printerror = 0;
			} else if (ahc_sent_msg(ahc, AHCMSG_1B,
						MSG_BUS_DEV_RESET, TRUE)) {
#ifdef __FreeBSD__
				/*
				 * Don't mark the user's request for this BDR
				 * as completing with CAM_BDR_SENT.  CAM3
				 * specifies CAM_REQ_CMP.
				 */
				if (scb != NULL
				 && scb->io_ctx->ccb_h.func_code== XPT_RESET_DEV
				 && ahc_match_scb(ahc, scb, target, channel,
						  CAM_LUN_WILDCARD,
						  SCB_LIST_NULL,
						  ROLE_INITIATOR)) {
					ahc_set_transaction_status(scb, CAM_REQ_CMP);
				}
#endif
				ahc_compile_devinfo(&devinfo,
						    initiator_role_id,
						    target,
						    CAM_LUN_WILDCARD,
						    channel,
						    ROLE_INITIATOR);
				ahc_handle_devreset(ahc, &devinfo,
						    CAM_BDR_SENT,
						    "Bus Device Reset",
						    /*verbose_level*/0);
				printerror = 0;
			} else if (ahc_sent_msg(ahc, AHCMSG_EXT,
						MSG_EXT_PPR, FALSE)) {
				struct ahc_initiator_tinfo *tinfo;
				struct ahc_tmode_tstate *tstate;

				/*
				 * PPR Rejected.  Try non-ppr negotiation
				 * and retry command.
				 */
				tinfo = ahc_fetch_transinfo(ahc,
							    devinfo.channel,
							    devinfo.our_scsiid,
							    devinfo.target,
							    &tstate);
				tinfo->curr.transport_version = 2;
				tinfo->goal.transport_version = 2;
				tinfo->goal.ppr_options = 0;
				ahc_qinfifo_requeue_tail(ahc, scb);
				printerror = 0;
			} else if (ahc_sent_msg(ahc, AHCMSG_EXT,
						MSG_EXT_WDTR, FALSE)
				|| ahc_sent_msg(ahc, AHCMSG_EXT,
						MSG_EXT_SDTR, FALSE)) {
				/*
				 * Negotiation Rejected.  Go-async and
				 * retry command.
				 */
				ahc_set_width(ahc, &devinfo,
					      MSG_EXT_WDTR_BUS_8_BIT,
					      AHC_TRANS_CUR|AHC_TRANS_GOAL,
					      /*paused*/TRUE);
				ahc_set_syncrate(ahc, &devinfo,
						/*syncrate*/NULL,
						/*period*/0, /*offset*/0,
						/*ppr_options*/0,
						AHC_TRANS_CUR|AHC_TRANS_GOAL,
						/*paused*/TRUE);
				ahc_qinfifo_requeue_tail(ahc, scb);
				printerror = 0;
			}
		}
		if (printerror != 0) {
			u_int i;

			if (scb != NULL) {
				u_int tag;

				if ((scb->hscb->control & TAG_ENB) != 0)
					tag = scb->hscb->tag;
				else
					tag = SCB_LIST_NULL;
				ahc_print_path(ahc, scb);
				ahc_abort_scbs(ahc, target, channel,
					       SCB_GET_LUN(scb), tag,
					       ROLE_INITIATOR,
					       CAM_UNEXP_BUSFREE);
			} else {
				/*
				 * We had not fully identified this connection,
				 * so we cannot abort anything.
				 */
				printf("%s: ", ahc_name(ahc));
			}
			for (i = 0; i < num_phases; i++) {
				if (lastphase == ahc_phase_table[i].phase)
					break;
			}
			printf("Unexpected busfree %s\n"
			       "SEQADDR == 0x%x\n",
			       ahc_phase_table[i].phasemsg,
			       ahc_inb(ahc, SEQADDR0)
				| (ahc_inb(ahc, SEQADDR1) << 8));
		}
		ahc_clear_msg_state(ahc);
		ahc_outb(ahc, CLRINT, CLRSCSIINT);
		ahc_restart(ahc);
	} else {
		printf("%s: Missing case in ahc_handle_scsiint. status = %x\n",
		       ahc_name(ahc), status);
		ahc_outb(ahc, CLRINT, CLRSCSIINT);
	}
}

/*
 * Force renegotiation to occur the next time we initiate
 * a command to the current device.
 */
static void
ahc_force_renegotiation(struct ahc_softc *ahc)
{
	struct	ahc_devinfo devinfo;
	struct	ahc_initiator_tinfo *targ_info;
	struct	ahc_tmode_tstate *tstate;

	ahc_fetch_devinfo(ahc, &devinfo);
	targ_info = ahc_fetch_transinfo(ahc,
					devinfo.channel,
					devinfo.our_scsiid,
					devinfo.target,
					&tstate);
	ahc_update_neg_request(ahc, &devinfo, tstate,
			       targ_info, /*force*/TRUE);
}

#define AHC_MAX_STEPS 2000
void
ahc_clear_critical_section(struct ahc_softc *ahc)
{
	int	stepping;
	int	steps;
	u_int	simode0;
	u_int	simode1;

	if (ahc->num_critical_sections == 0)
		return;

	stepping = FALSE;
	steps = 0;
	simode0 = 0;
	simode1 = 0;
	for (;;) {
		struct	cs *cs;
		u_int	seqaddr;
		u_int	i;