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

		lastphase = ahd_inb(ahd, LASTPHASE);
		printf("%s:%c:%d: Missed busfree. "
		       "Lastphase = 0x%x, Curphase = 0x%x\n",
		       ahd_name(ahd), 'A',
		       SCSIID_TARGET(ahd, ahd_inb(ahd, SAVED_SCSIID)),
		       lastphase, ahd_inb(ahd, SCSISIGI));
		ahd_restart(ahd);
		return;
	}
	case DATA_OVERRUN:
	{
		/*
		 * When the sequencer detects an overrun, it
		 * places the controller in "BITBUCKET" mode
		 * and allows the target to complete its transfer.
		 * Unfortunately, none of the counters get updated
		 * when the controller is in this mode, so we have
		 * no way of knowing how large the overrun was.
		 */
		struct	scb *scb;
		u_int	scbindex = ahd_get_scbptr(ahd);
		u_int	lastphase = ahd_inb(ahd, LASTPHASE);

		scb = ahd_lookup_scb(ahd, scbindex);
		ahd_print_path(ahd, scb);
		printf("data overrun detected %s."
		       "  Tag == 0x%x.\n",
		       ahd_lookup_phase_entry(lastphase)->phasemsg,
  		       SCB_GET_TAG(scb));
		ahd_print_path(ahd, scb);
		printf("%s seen Data Phase.  Length = %ld.  NumSGs = %d.\n",
		       ahd_inb(ahd, SEQ_FLAGS) & DPHASE ? "Have" : "Haven't",
		       ahd_get_transfer_length(scb), scb->sg_count);
		ahd_dump_sglist(scb);

		/*
		 * Set this and it will take effect when the
		 * target does a command complete.
		 */
		ahd_freeze_devq(ahd, scb);
		ahd_set_transaction_status(scb, CAM_DATA_RUN_ERR);
		ahd_freeze_scb(scb);
		break;
	}
	case MKMSG_FAILED:
	{
		struct ahd_devinfo devinfo;
		struct scb *scb;
		u_int scbid;

		ahd_fetch_devinfo(ahd, &devinfo);
		printf("%s:%c:%d:%d: Attempt to issue message failed\n",
		       ahd_name(ahd), devinfo.channel, devinfo.target,
		       devinfo.lun);
		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb != NULL
		 && (scb->flags & SCB_RECOVERY_SCB) != 0)
			/*
			 * Ensure that we didn't put a second instance of this
			 * SCB into the QINFIFO.
			 */
			ahd_search_qinfifo(ahd, SCB_GET_TARGET(ahd, scb),
					   SCB_GET_CHANNEL(ahd, scb),
					   SCB_GET_LUN(scb), SCB_GET_TAG(scb),
					   ROLE_INITIATOR, /*status*/0,
					   SEARCH_REMOVE);
		ahd_outb(ahd, SCB_CONTROL,
			 ahd_inb(ahd, SCB_CONTROL) & ~MK_MESSAGE);
		break;
	}
	}
	/*
	 *  The sequencer is paused immediately on
	 *  a SEQINT, so we should restart it when
	 *  we're done.
	 */
	ahd_unpause(ahd);
}

void
ahd_handle_scsiint(struct ahd_softc *ahd, u_int intstat)
{
	struct scb	*scb;
	u_int		 status0;
	u_int		 status3;
	u_int		 status;
	u_int		 lqistat1;
	u_int		 lqostat0;
	u_int		 scbid;

	ahd_update_modes(ahd);
	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);

	status3 = ahd_inb(ahd, SSTAT3) & (NTRAMPERR|OSRAMPERR);
	status0 = ahd_inb(ahd, SSTAT0) & (IOERR|OVERRUN|SELDI|SELDO);
	status = ahd_inb(ahd, SSTAT1) & (SELTO|SCSIRSTI|BUSFREE|SCSIPERR);
	lqistat1 = ahd_inb(ahd, LQISTAT1);
	lqostat0 = ahd_inb(ahd, LQOSTAT0);
	if ((status0 & (SELDI|SELDO)) != 0) {
		u_int simode0;

		ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
		simode0 = ahd_inb(ahd, SIMODE0);
		status0 &= simode0 & (ENSELDO|ENSELDI|IOERR);
		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	}
	scbid = ahd_get_scbptr(ahd);
	scb = ahd_lookup_scb(ahd, scbid);
	if (scb != NULL
	 && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
		scb = NULL;

	/* Make sure the sequencer is in a safe location. */
	ahd_clear_critical_section(ahd);

	if ((status0 & IOERR) != 0) {
		int now_lvd;

		now_lvd = ahd_inb(ahd, SBLKCTL) & ENAB40;
		printf("%s: Transceiver State Has Changed to %s mode\n",
		       ahd_name(ahd), now_lvd ? "LVD" : "SE");
		ahd_outb(ahd, CLRSINT0, CLRIOERR);
/* XXX Still True?? */
		/*
		 * 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.
		 */
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/now_lvd == 0);

		ahd_pause(ahd);
		ahd_setup_iocell_workaround(ahd);
		ahd_unpause(ahd);
	} else if ((status0 & OVERRUN) != 0) {
		printf("%s: SCSI offset overrun detected.  Resetting bus.\n",
		       ahd_name(ahd));
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
	} else if ((status & SCSIRSTI) != 0) {
		printf("%s: Someone reset channel A\n", ahd_name(ahd));
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/FALSE);
	} else if ((status & SCSIPERR) != 0) {
		ahd_handle_transmission_error(ahd);
	} else if (lqostat0 != 0) {
		printf("%s: lqostat0 == 0x%x!\n", ahd_name(ahd), lqostat0);
		ahd_outb(ahd, CLRLQOINT0, lqostat0);
		if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
			ahd_outb(ahd, CLRLQOINT1, 0);
		}
	} else if ((status & SELTO) != 0) {
		u_int scbid;

		/* Stop the selection */
		ahd_outb(ahd, SCSISEQ0, 0);

		/* No more pending messages */
		ahd_clear_msg_state(ahd);

		/* Clear interrupt state */
		ahd_outb(ahd, SIMODE1, ahd_inb(ahd, SIMODE1) & ~ENBUSFREE);
		ahd_outb(ahd, 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).
		 */
		ahd_outb(ahd, CLRSINT0, CLRSELINGO);

		scbid = ahd_inw(ahd, WAITING_TID_HEAD);
#if AHD_DEBUG
		if ((ahd_debug & AHD_SHOW_SELTO) != 0)
			printf("%s: Saw Selection Timeout for SCB 0x%x\n",
			       ahd_name(ahd), scbid);
#endif
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb == NULL) {
			printf("%s: ahd_intr - referenced scb not "
			       "valid during SELTO scb(0x%x)\n",
			       ahd_name(ahd), scbid);
			ahd_dump_card_state(ahd);
			panic("For diagnostics");
		} else {
			ahd_set_transaction_status(scb, CAM_SEL_TIMEOUT);
			ahd_freeze_devq(ahd, scb);
		}
		ahd_outb(ahd, CLRINT, CLRSCSIINT);
		ahd_iocell_first_selection(ahd);
		ahd_restart(ahd);
	} else if ((status0 & (SELDI|SELDO)) != 0) {
		ahd_iocell_first_selection(ahd);
		ahd_unpause(ahd);
	} else if (status3 != 0) {
		printf("%s: SCSI Cell parity error SSTAT3 == 0x%x\n",
		       ahd_name(ahd), status3);
		ahd_outb(ahd, CLRSINT3, status3);
	} else if ((lqistat1 & (LQIPHASE_LQ|LQIPHASE_NLQ)) != 0) {
		ahd_handle_lqiphase_error(ahd, lqistat1);
	} else if ((status & BUSFREE) != 0) {
		u_int busfreetime;
		u_int lqostat1;
		int   restart;
		int   clear_fifo;
		int   packetized;
		u_int mode;

		/*
		 * 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.
		 */
		ahd_outb(ahd, SCSISEQ0, 0);

		/*
		 * Determine what we were up to at the time of
		 * the busfree.
		 */
		mode = AHD_MODE_SCSI;
		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
		busfreetime = ahd_inb(ahd, SSTAT2) & BUSFREETIME;
		lqostat1 = ahd_inb(ahd, LQOSTAT1);
		switch (busfreetime) {
		case BUSFREE_DFF0:
		case BUSFREE_DFF1:
		{
			u_int	scbid;
			struct	scb *scb;

			mode = busfreetime == BUSFREE_DFF0
			     ? AHD_MODE_DFF0 : AHD_MODE_DFF1;
			ahd_set_modes(ahd, mode, mode);
			scbid = ahd_get_scbptr(ahd);
			scb = ahd_lookup_scb(ahd, scbid);
			if (scb == NULL) {
				printf("%s: Invalid SCB in DFF%d "
				       "during unexpected busfree\n",
				       ahd_name(ahd), mode);
				packetized = 0;
			} else
				packetized = (scb->flags & SCB_PACKETIZED) != 0;
			clear_fifo = 1;
			break;
		}
		case BUSFREE_LQO:
			clear_fifo = 0;
			packetized = 1;
			break;
		default:
			clear_fifo = 0;
			packetized =  (lqostat1 & LQOBUSFREE) != 0;
			if (!packetized
			 && ahd_inb(ahd, LASTPHASE) == P_BUSFREE)
				packetized = 1;
			break;
		}

#if AHD_DEBUG
		if ((ahd_debug & AHD_SHOW_MISC) != 0)
			printf("Saw Busfree.  Busfreetime = 0x%x.\n",
			       busfreetime);
#endif
		/*
		 * Busfrees that occur in non-packetized phases are
		 * handled by the nonpkt_busfree handler.
		 */
		if (packetized && ahd_inb(ahd, LASTPHASE) == P_BUSFREE) {
			restart = ahd_handle_pkt_busfree(ahd, busfreetime);
		} else {
			restart = ahd_handle_nonpkt_busfree(ahd);
		}
		/*
		 * Clear the busfree interrupt status.  The setting of
		 * the interrupt is a pulse, so we do not need to muck
		 * with the ENBUSFREE logic.  This also ensures that if
		 * the bus has moved on to another connection, busfree
		 * protection is still in force.
		 */
		ahd_outb(ahd, CLRSINT1, CLRBUSFREE|CLRSCSIPERR);

		if (clear_fifo)
			ahd_clear_fifo(ahd, mode);

		ahd_clear_msg_state(ahd);
		ahd_outb(ahd, CLRINT, CLRSCSIINT);
		if (restart)
			ahd_restart(ahd);
		else {
			ahd_unpause(ahd);
		}
	} else {
		printf("%s: Missing case in ahd_handle_scsiint. status = %x\n",
		       ahd_name(ahd), status);
		printf("%s: lqostat1 == 0x%x, SIMODE1 == 0x%x\n",
		       ahd_name(ahd), ahd_inb(ahd, LQOSTAT1),
		       ahd_inb(ahd, SIMODE1));
		ahd_outb(ahd, CLRINT, CLRSCSIINT);
		ahd_dump_card_state(ahd);
		panic("Missing SCSIINT case");
		ahd_unpause(ahd);
	}
}

static void
ahd_handle_transmission_error(struct ahd_softc *ahd)
{
	u_int		 lqistat1;
	u_int		 lqistat2;
	u_int		 msg_out;
	u_int		 curphase;
	u_int		 lastphase;
	u_int		 perrdiag;

	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	lqistat1 = ahd_inb(ahd, LQISTAT1) & ~(LQIPHASE_LQ|LQIPHASE_NLQ);
	lqistat2 = ahd_inb(ahd, LQISTAT2);
	if ((lqistat1 & (LQICRCI_NLQ|LQICRCI_LQ)) == 0
	 && (ahd->bugs & AHD_NLQICRC_DELAYED_BUG) != 0) {
		u_int lqistate;

		ahd_set_modes(ahd, AHD_MODE_CFG, AHD_MODE_CFG);
		lqistate = ahd_inb(ahd, LQISTATE);
		if ((lqistate >= 0x1E && lqistate <= 0x24)
		 || (lqistate == 0x29)) {
			printf("%s: NLQCRC found via LQISTATE\n",
			       ahd_name(ahd));
			lqistat1 |= LQICRCI_NLQ;
		}
		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	}

	ahd_outb(ahd, CLRLQIINT1, lqistat1);
	lastphase = ahd_inb(ahd, LASTPHASE);
	curphase = ahd_inb(ahd, SCSISIGI) & PHASE_MASK;
	perrdiag = ahd_inb(ahd, PERRDIAG);
	msg_out = MSG_INITIATOR_DET_ERR;
	ahd_outb(ahd, CLRSINT1, CLRSCSIPERR);
	printf("%s: Transmission error detected\n", ahd_name(ahd));
	printf("%s: lqistat1 == 0x%x, LASTPHASE == 0x0%x, "
	       "curphase = 0x%x, perrdiag == 0x%x\n",
	       ahd_name(ahd), lqistat1, lastphase, curphase, perrdiag);
	ahd_dump_card_state(ahd);
	if ((lqistat1 & (LQIOVERI_LQ|LQIOVERI_NLQ)) != 0) {
		printf("%s: Gross protocol error during incoming "
		       "packet.  lqistat1 == 0x%x.  Resetting bus.\n",
		       ahd_name(ahd), lqistat1);
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
		return;
	} else if ((lqistat1 & LQICRCI_LQ) != 0) {
		/*
		 * A CRC error has been detected on an incoming LQ.
		 * The bus is currently hung on the last ACK.
		 * Hit LQIRETRY to release the last ack, and
		 * wait for the sequencer to determine that ATNO
		 * is asserted while in message out to take us
		 * to our host message loop.  No NONPACKREQ or
		 * LQIPHASE type errors will occur in this
		 * scenario.  After this first LQIRETRY, the LQI
		 * manager will be in ISELO where it will
		 * happily sit until another packet phase begins.
		 * Unexpected bus free detection is enabled
		 * through any phases that occur after we release
		 * this last ack until the LQI manager sees a
		 * packet phase.  This implies we may have to
		 * ignore a perfectly valid "unexected busfree"
		 * after our "initiator detected error" message is
		 * sent.  A busfree is the expected response after
		 * we tell the target that it's L_Q was corrupted.
		 * (SPI4R09 10.7.3.3.3)
		 */
		ahd_outb(ahd, LQCTL2, LQIRETRY);
		printf("LQIRetry for LQICRCI_LQ to release ACK\n");
	} else if ((lqistat1 & LQICRCI_NLQ) != 0) {
		u_int scbid;
		struct scb *scb;

		/*
		 * We detected a CRC error in a NON-LQ packet.
		 * The hardware has varying behavior in this situation
		 * depending on whether this packet was part of a
		 * stream or not.
		 *
		 * PKT by PKT mode:
		 * The hardware has already acked the complete packet.
		 * If the target honors our outstanding ATN condition,
		 * we should be (or soon will be) in MSGOUT phase.
		 * This will trigger the LQIPHASE_LQ status bit as the
		 * hardware was expecting another LQ.  Unexpected
		 * busfree detection is enabled.  Once LQIPHASE_LQ is
		 * true (first entry into host message loop is much
		 * the same), we must clear LQIPHASE_LQ and hit
		 * LQIRETRY so the hardware is ready to handle
		 * a future LQ.  NONPACKREQ will not be asserted again
		 * once we hit LQIRETRY until another packet is
		 * processed.  The target may either go busfree
		 * or start another packet in response to our message.
		 *
		 * Read Streaming P0 asserted:
		 * If we raise ATN and the target completes the entire
		 * stream (P0 asserted during the last packet), the
		 * hardware will ack all data and return to the ISTART
		 * state.  When the target reponds to our ATN condition,
		 * LQIPHASE_LQ will be asserted.  We should respond to
		 * this with an LQIRETRY to prepare for any future
		 * packets.  NONPACKREQ will not be asserted again
		 * once we hit LQIRETRY until another packet is
		 * processed.  The target may either go busfree or
		 * start another packet in response to our message.
		 * Busfree detection is enabled.
		 *
		 * Read Streaming P0 not asserted:
		 * If we raise ATN and the target transitions to
		 * MSGOUT in or after a packet where P0 is not
		 * asserted, the hardware will assert LQIPHASE_NLQ.
		 * We should respond to the LQIPHASE_NLQ with an
		 * LQICONTINUE.  Should the target stay in a non-pkt
		 * phase after we send our message, the hardware
		 * will assert LQIPHASE_LQ.  Recovery is then just as
		 * listed above for the read streaming with P0 asserted.
		 * Busfree detection is enabled.
		 */
		printf("LQICRC_NLQ\n");
		ahd_set_active_fifo(ahd);
		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb == NULL) {
			printf("%s: No SCB valid for LQICRC_NLQ.  "