aic79xx_core.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

	}

	ahd_dump_card_state(ahd);
	panic("BRKADRINT");

	/* Tell everyone that this HBA is no longer availible */
	ahd_abort_scbs(ahd, CAM_TARGET_WILDCARD, ALL_CHANNELS,
		       CAM_LUN_WILDCARD, SCB_LIST_NULL, ROLE_UNKNOWN,
		       CAM_NO_HBA);

	/* Tell the system that this controller has gone away. */
	ahd_free(ahd);
}

void
ahd_handle_seqint(struct ahd_softc *ahd, u_int intstat)
{
	u_int seqintcode;

	/*
	 * Save the sequencer interrupt code and clear the SEQINT
	 * bit. We will unpause the sequencer, if appropriate,
	 * after servicing the request.
	 */
	seqintcode = ahd_inb(ahd, SEQINTCODE);
	ahd_outb(ahd, CLRINT, CLRSEQINT);
	ahd_update_modes(ahd);
#if AHD_DEBUG
	if ((ahd_debug & AHD_SHOW_MISC) != 0)
		printf("%s: Handle Seqint Called for code %d\n",
		       ahd_name(ahd), seqintcode);
#endif
	switch (seqintcode) {
	case ENTERING_NONPACK:
	{
		struct	scb *scb;
		u_int	scbid;

		AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
				 ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb == NULL) {
			/*
			 * Somehow need to know if this
			 * is from a selection or reselection.
			 * From that, we can termine target
			 * ID so we at least have an I_T nexus.
			 */
		} else {
			ahd_outb(ahd, SAVED_SCSIID, scb->hscb->scsiid);
			ahd_outb(ahd, SAVED_LUN, scb->hscb->lun);
			ahd_outb(ahd, SEQ_FLAGS, 0x0);
		}
		if ((ahd_inb(ahd, LQISTAT2) & LQIPHASE_OUTPKT) != 0
		 && (ahd_inb(ahd, SCSISIGO) & ATNO) != 0) {
			/*
			 * Phase change after read stream with
			 * CRC error with P0 asserted on last
			 * packet.
			 */
			printf("Assuming LQIPHASE_NLQ with P0 assertion\n");
		}
		printf("Entering NONPACK\n");
		break;
	}
	case INVALID_SEQINT:
		printf("%s: Invalid Sequencer interrupt occurred.\n",
		       ahd_name(ahd));
		ahd_dump_card_state(ahd);
		printf("invalid seqint");
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
		break;
	case STATUS_OVERRUN:
	{
		printf("%s: Status Overrun", ahd_name(ahd));
		ahd_dump_card_state(ahd);
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
		break;
	}
	case CFG4ISTAT_INTR:
	{
		struct	scb *scb;
		u_int	scbid;

		ahd_update_modes(ahd);
		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb == NULL) {
			ahd_dump_card_state(ahd);
			printf("CFG4ISTAT: Free SCB %d referenced", scbid);
			panic("For safety");
		}
		ahd_outq(ahd, HADDR, scb->sense_busaddr);
		ahd_outw(ahd, HCNT, AHD_SENSE_BUFSIZE);
		ahd_outb(ahd, HCNT + 2, 0);
		ahd_outb(ahd, SG_CACHE_PRE, SG_LAST_SEG);
		ahd_outb(ahd, DFCNTRL, PRELOADEN|SCSIEN|HDMAEN);
		break;
	}
	case ILLEGAL_PHASE:
	{
		u_int bus_phase;

		bus_phase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
		printf("%s: ILLEGAL_PHASE 0x%x\n",
		       ahd_name(ahd), bus_phase);

		switch (bus_phase) {
		case P_DATAOUT:
		case P_DATAIN:
		case P_DATAOUT_DT:
		case P_DATAIN_DT:
		case P_MESGOUT:
		case P_STATUS:
		case P_MESGIN:
			ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
			printf("%s: Issued Bus Reset.\n", ahd_name(ahd));
			break;
		case P_COMMAND:
		{
			struct	ahd_devinfo devinfo;
			struct	scb *scb;
			struct	ahd_initiator_tinfo *targ_info;
			struct	ahd_tmode_tstate *tstate;
			struct	ahd_transinfo *tinfo;
			u_int	scbid;

			/*
			 * If a target takes us into the command phase
			 * assume that it has been externally reset and
			 * has thus lost our previous packetized negotiation
			 * agreement.  Since we have not sent an identify
			 * message and may not have fully qualified the
			 * connection, we change our command to TUR, assert
			 * ATN and ABORT the task when we go to message in
			 * phase.  The OSM will see the REQUEUE_REQUEST
			 * status and retry the command.
			 */
			scbid = ahd_get_scbptr(ahd);
			scb = ahd_lookup_scb(ahd, scbid);
			if (scb == NULL) {
				printf("Invalid phase with no valid SCB.  "
				       "Resetting bus.\n");
				ahd_reset_channel(ahd, 'A',
						  /*Initiate Reset*/TRUE);
				break;
			}
			ahd_compile_devinfo(&devinfo, SCB_GET_OUR_ID(scb),
					    SCB_GET_TARGET(ahd, scb),
					    SCB_GET_LUN(scb),
					    SCB_GET_CHANNEL(ahd, scb),
					    ROLE_INITIATOR);
			targ_info = ahd_fetch_transinfo(ahd,
							devinfo.channel,
							devinfo.our_scsiid,
							devinfo.target,
							&tstate);
			tinfo = &targ_info->curr;
			ahd_set_width(ahd, &devinfo, MSG_EXT_WDTR_BUS_8_BIT,
				      AHD_TRANS_ACTIVE|AHD_TRANS_GOAL,
				      /*paused*/TRUE);
			ahd_set_syncrate(ahd, &devinfo, /*period*/0,
					 /*offset*/0, /*ppr_options*/0,
					 AHD_TRANS_ACTIVE, /*paused*/TRUE);
			ahd_outb(ahd, SCB_CDB_STORE, 0);
			ahd_outb(ahd, SCB_CDB_STORE+1, 0);
			ahd_outb(ahd, SCB_CDB_STORE+2, 0);
			ahd_outb(ahd, SCB_CDB_STORE+3, 0);
			ahd_outb(ahd, SCB_CDB_STORE+4, 0);
			ahd_outb(ahd, SCB_CDB_STORE+5, 0);
			ahd_outb(ahd, SCB_CDB_LEN, 6);
			scb->hscb->control &= ~(TAG_ENB|SCB_TAG_TYPE);
			scb->hscb->control |= MK_MESSAGE;
			ahd_outb(ahd, SCB_CONTROL, scb->hscb->control);
			ahd_outb(ahd, MSG_OUT, HOST_MSG);
			ahd_outb(ahd, SAVED_SCSIID, scb->hscb->scsiid);
			/*
			 * The lun is 0, regardless of the SCB's lun
			 * as we have not sent an identify message.
			 */
			ahd_outb(ahd, SAVED_LUN, 0);
			ahd_outb(ahd, SEQ_FLAGS, 0);
			ahd_assert_atn(ahd);
			scb->flags &= ~(SCB_PACKETIZED);
			scb->flags |= SCB_ABORT|SCB_CMDPHASE_ABORT;
			ahd_freeze_devq(ahd, scb);
			ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
			ahd_freeze_scb(scb);

			/*
			 * Allow the sequencer to continue with
			 * non-pack processing.
			 */
			ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
			ahd_outb(ahd, CLRLQOINT1, CLRLQOPHACHGINPKT);
			if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
				ahd_outb(ahd, CLRLQOINT1, 0);
			}
			printf("Continuing non-pack processing...\n");
			break;
		}
		}
		break;
	}
	case CFG4OVERRUN:
		printf("%s: CFG4OVERRUN mode = %x\n", ahd_name(ahd),
		       ahd_inb(ahd, MODE_PTR));
		break;
	case DUMP_CARD_STATE:
	{
		ahd_dump_card_state(ahd);
		break;
	}
	case PDATA_REINIT:
	{
		printf("%s: PDATA_REINIT - DFCNTRL = 0x%x "
		       "SG_CACHE_SHADOW = 0x%x\n",
		       ahd_name(ahd), ahd_inb(ahd, DFCNTRL),
		       ahd_inb(ahd, SG_CACHE_SHADOW));
		ahd_reinitialize_dataptrs(ahd);
		break;
	}
	case HOST_MSG_LOOP:
	{
		struct ahd_devinfo devinfo;

		/*
		 * The sequencer has encountered a message phase
		 * that requires host assistance for completion.
		 * While handling the message phase(s), we will be
		 * notified by the sequencer after each byte is
		 * transfered so we can track bus phase changes.
		 *
		 * If this is the first time we've seen a HOST_MSG_LOOP
		 * interrupt, initialize the state of the host message
		 * loop.
		 */
		ahd_fetch_devinfo(ahd, &devinfo);
		if (ahd->msg_type == MSG_TYPE_NONE) {
			struct scb *scb;
			u_int scb_index;
			u_int bus_phase;

			bus_phase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
			if (bus_phase != P_MESGIN
			 && bus_phase != P_MESGOUT) {
				printf("ahd_intr: HOST_MSG_LOOP bad "
				       "phase 0x%x\n",
				      bus_phase);
				/*
				 * Probably transitioned to bus free before
				 * we got here.  Just punt the message.
				 */
				ahd_dump_card_state(ahd);
				ahd_clear_intstat(ahd);
				ahd_restart(ahd);
				return;
			}

			scb_index = ahd_get_scbptr(ahd);
			scb = ahd_lookup_scb(ahd, scb_index);
			if (devinfo.role == ROLE_INITIATOR) {
				if (bus_phase == P_MESGOUT)
					ahd_setup_initiator_msgout(ahd,
								   &devinfo,
								   scb);
				else {
					ahd->msg_type =
					    MSG_TYPE_INITIATOR_MSGIN;
					ahd->msgin_index = 0;
				}
			}
#if AHD_TARGET_MODE
			else {
				if (bus_phase == P_MESGOUT) {
					ahd->msg_type =
					    MSG_TYPE_TARGET_MSGOUT;
					ahd->msgin_index = 0;
				}
				else 
					ahd_setup_target_msgin(ahd,
							       &devinfo,
							       scb);
			}
#endif
		}

		ahd_handle_message_phase(ahd);
		break;
	}
	case NO_MATCH:
	{
		/* Ensure we don't leave the selection hardware on */
		AHD_ASSERT_MODES(ahd, AHD_MODE_SCSI_MSK, AHD_MODE_SCSI_MSK);
		ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);

		printf("%s:%c:%d: no active SCB for reconnecting "
		       "target - issuing BUS DEVICE RESET\n",
		       ahd_name(ahd), 'A', ahd_inb(ahd, SELID));
		printf("SAVED_SCSIID == 0x%x, SAVED_LUN == 0x%x, "
		       "ARG_1 == 0x%x ACCUM = 0x%x\n",
		       ahd_inb(ahd, SAVED_SCSIID), ahd_inb(ahd, SAVED_LUN),
		       ahd_inb(ahd, ARG_1), ahd_inb(ahd, ACCUM));
		printf("SEQ_FLAGS == 0x%x, SCBPTR == 0x%x, BTT == 0x%x, "
		       "SINDEX == 0x%x\n",
		       ahd_inb(ahd, SEQ_FLAGS), ahd_get_scbptr(ahd),
		       ahd_find_busy_tcl(ahd,
			    BUILD_TCL(ahd_inb(ahd, SAVED_SCSIID),
				      ahd_inb(ahd, SAVED_LUN))),
		       ahd_inb(ahd, SINDEX));
		printf("SELID == 0x%x, SCB_SCSIID == 0x%x, SCB_LUN == 0x%x, "
		       "SCB_CONTROL == 0x%x\n",
		       ahd_inb(ahd, SELID), ahd_inb_scbram(ahd, SCB_SCSIID),
		       ahd_inb_scbram(ahd, SCB_LUN),
		       ahd_inb_scbram(ahd, SCB_CONTROL));
		printf("SCSIBUS[0] == 0x%x, SCSISIGI == 0x%x\n",
		       ahd_inb(ahd, SCSIBUS), ahd_inb(ahd, SCSISIGI));
		printf("SXFRCTL0 == 0x%x\n", ahd_inb(ahd, SXFRCTL0));
		printf("SEQCTL0 == 0x%x\n", ahd_inb(ahd, SEQCTL0));
		ahd_dump_card_state(ahd);
		ahd->msgout_buf[0] = MSG_BUS_DEV_RESET;
		ahd->msgout_len = 1;
		ahd->msgout_index = 0;
		ahd->msg_type = MSG_TYPE_INITIATOR_MSGOUT;
		ahd_outb(ahd, MSG_OUT, HOST_MSG);
		ahd_assert_atn(ahd);
		break;
	}
	case PROTO_VIOLATION:
	{
		struct	scb *scb;
		u_int	scbid;
		u_int	scsiid;
		u_int	target;
		u_int	seq_flags;
		u_int	curphase;
		int	found;

		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		scsiid = ahd_inb(ahd, SAVED_SCSIID);
		target = SCSIID_TARGET(ahd, scsiid);
		seq_flags = ahd_inb(ahd, SEQ_FLAGS);
		curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
		if ((seq_flags & NOT_IDENTIFIED) != 0) {

			/*
			 * The reconnecting target either did not send an
			 * identify message, or did, but we didn't find an SCB
			 * to match.
			 */
			printf("%s:%c:%d: Target did not send an "
			       "IDENTIFY message. LASTPHASE = 0x%x, "
			       "SAVED_SCSIID == 0x%x\n", ahd_name(ahd),
			       'A', target, ahd_inb(ahd, LASTPHASE),
			       scsiid);
		} else if (scb == NULL) {
			/*
			 * We don't seem to have an SCB active for this
			 * transaction.  Print an error and reset the bus.
			 */
			printf("%s:%c:%d: No SCB found during protocol "
			       "violation\n", ahd_name(ahd), 'A', target);
			goto proto_violation_reset;
		} else if ((seq_flags & NO_CDB_SENT) != 0) {
			ahd_print_path(ahd, scb);
			printf("No or incomplete CDB sent to device.\n");
		} else if ((ahd_inb(ahd, SCB_CONTROL) & STATUS_RCVD) == 0) {
			/*
			 * The target never bothered to provide status to
			 * us prior to completing the command.  Since we don't
			 * know the disposition of this command, we must attempt
			 * to abort it.  Assert ATN and prepare to send an abort
			 * message.
			 */
			ahd_print_path(ahd, scb);
			printf("Completed command without status.\n");
		} else {
			ahd_print_path(ahd, scb);
			printf("Unknown protocol violation.\n");
			ahd_dump_card_state(ahd);
		}
		if ((curphase & ~P_DATAIN_DT) == 0) {
proto_violation_reset:
			/*
			 * Target either went directly to data
			 * phase or didn't respond to our ATN.
			 * The only safe thing to do is to blow
			 * it away with a bus reset.
			 */
			found = ahd_reset_channel(ahd, 'A', TRUE);
			printf("%s: Issued Channel %c Bus Reset. "
			       "%d SCBs aborted\n", ahd_name(ahd), 'A', found);
		} else {
			/*
			 * Leave the selection hardware off in case
			 * this abort attempt will affect yet to
			 * be sent commands.
			 */
			ahd_outb(ahd, SCSISEQ0,
				 ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
			ahd_print_path(ahd, scb);
			printf("Protocol violation %s.  Attempting to abort.\n",
			       ahd_lookup_phase_entry(curphase)->phasemsg);
			scb->flags |= SCB_ABORT;
			ahd_assert_atn(ahd);
			ahd_outb(ahd, MSG_OUT, HOST_MSG);
		}
		return;
	}
	case IGN_WIDE_RES:
	{
		struct ahd_devinfo devinfo;

		ahd_fetch_devinfo(ahd, &devinfo);
		ahd_handle_ign_wide_residue(ahd, &devinfo);
		break;
	}
	case BAD_PHASE:
	{
		u_int lastphase;

		lastphase = ahd_inb(ahd, LASTPHASE);
		printf("%s:%c:%d: unknown scsi bus phase %x, "
		       "lastphase = 0x%x.  Attempting to continue\n",
		       ahd_name(ahd), 'A',
		       SCSIID_TARGET(ahd, ahd_inb(ahd, SAVED_SCSIID)),
		       lastphase, ahd_inb(ahd, SCSISIGI));
		break;
	}
	case MISSED_BUSFREE:
	{
		u_int lastphase;