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

			       "Resetting bus\n", ahd_name(ahd));
			ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
			return;
		}
		scb->flags |= SCB_TRANSMISSION_ERROR;
	} else if ((lqistat1 & LQIBADLQI) != 0) {
		printf("Need to handle BADLQI!\n");
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
		return;
	} else if ((perrdiag & (PARITYERR|LASTPHASE)) == PARITYERR) {
		if ((curphase & ~P_DATAIN_DT) != 0) {
			/* Ack the byte.  So we can continue. */
			printf("Acking %s to clear perror\n",
			       ahd_lookup_phase_entry(curphase)->phasemsg);
			ahd_inb(ahd, SCSIDAT);
		}
	
		if (curphase == P_MESGIN)
			msg_out = MSG_PARITY_ERROR;
	}

	/*
	 * 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.
	 */
	ahd->send_msg_perror = msg_out;
	ahd_outb(ahd, MSG_OUT, HOST_MSG);
	ahd_outb(ahd, CLRINT, CLRSCSIINT);
	ahd_unpause(ahd);
}

static void
ahd_handle_lqiphase_error(struct ahd_softc *ahd, u_int lqistat1)
{
	/*
	 * Clear the sources of the interrupts.
	 */
	ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
	ahd_outb(ahd, CLRLQIINT1, lqistat1);

	/*
	 * If the "illegal" phase changes were in response
	 * to our ATN to flag a CRC error, AND we ended up
	 * on packet boundaries, clear the error, restart the
	 * LQI manager as appropriate, and go on our merry
	 * way toward sending the message.  Otherwise, reset
	 * the bus to clear the error.
	 */
	ahd_set_active_fifo(ahd);
	if ((ahd_inb(ahd, SCSISIGO) & ATNO) != 0
	 && (ahd_inb(ahd, MDFFSTAT) & DLZERO) != 0) {
		if ((lqistat1 & LQIPHASE_LQ) != 0) {
			printf("LQIRETRY for LQIPHASE_LQ\n");
			ahd_outb(ahd, LQCTL2, LQIRETRY);
		} else if ((lqistat1 & LQIPHASE_NLQ) != 0) {
			printf("LQICONTINUE for LQIPHASE_NLQ\n");
			ahd_outb(ahd, LQCTL2, LQIRETRY);
		} else
			panic("ahd_handle_lqiphase_error: No phase errors\n");
		ahd_dump_card_state(ahd);
		ahd_outb(ahd, CLRINT, CLRSCSIINT);
		ahd_unpause(ahd);
	} else {
		printf("Reseting Channel for LQI Phase error\n");
		ahd_dump_card_state(ahd);
		ahd_reset_channel(ahd, 'A', /*Initiate Reset*/TRUE);
	}
}

/*
 * Packetized unexpected or expected busfree.
 * Entered in MODE_SCSI.
 */
static int
ahd_handle_pkt_busfree(struct ahd_softc *ahd, u_int busfreetime)
{
	u_int lqostat1;

	AHD_ASSERT_MODES(ahd, ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK),
			 ~(AHD_MODE_UNKNOWN_MSK|AHD_MODE_CFG_MSK));
	lqostat1 = ahd_inb(ahd, LQOSTAT1);
	if ((lqostat1 & LQOBUSFREE) != 0) {
		struct scb *scb;
		u_int scbid;
		u_int waiting_h;
		u_int waiting_t;
		u_int next;

		if ((busfreetime & BUSFREE_LQO) == 0)
			printf("%s: Warning, BUSFREE time is 0x%x.  "
			       "Expected BUSFREE_LQO.\n",
			       ahd_name(ahd), busfreetime);

		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		if (scb == NULL)
		       panic("SCB not valid during LQOBUSFREE");
		ahd_print_path(ahd, scb);
		printf("Probable outgoing LQ CRC error.  Retrying command\n");

		/*
		 * Return the LQO manager to its idle loop.  It will
		 * not do this automatically if the busfree occurs
		 * after the first REQ of either the LQ or command
		 * packet or between the LQ and command packet.
		 */
		ahd_outb(ahd, LQCTL2, ahd_inb(ahd, LQCTL2) | LQOTOIDLE);

		/*
		 * Clear the status.
		 */
		ahd_outb(ahd, CLRLQOINT1, CLRLQOBUSFREE);
		if ((ahd->bugs & AHD_CLRLQO_AUTOCLR_BUG) != 0) {
			ahd_outb(ahd, CLRLQOINT1, 0);
		}
		/*
		 * The LQO manager detected an unexpected busfree
		 * either:
		 *
		 * 1) During an outgoing LQ.
		 * 2) After an outgoing LQ but before the first
		 *    REQ of the command packet.
		 * 3) During an outgoing command packet.
		 *
		 * In all cases, CURRSCB is pointing to the
		 * SCB that encountered the failure.  Clean
		 * up the queue, clear SELDO and LQOBUSFREE,
		 * and allow the sequencer to restart the select
		 * out at its lesure.
		 */
		ahd_outb(ahd, SCSISEQ0, ahd_inb(ahd, SCSISEQ0) & ~ENSELO);
		ahd_outb(ahd, CLRSINT0, CLRSELDO);
		waiting_h = ahd_inw(ahd, WAITING_TID_HEAD);
		if (waiting_h != scbid) {

			ahd_outw(ahd, WAITING_TID_HEAD, scbid);
			waiting_t = ahd_inw(ahd, WAITING_TID_TAIL);
			next = SCB_LIST_NULL;
			if (waiting_t == waiting_h) {
				ahd_outw(ahd, WAITING_TID_TAIL, scbid);
			} else {
				ahd_set_scbptr(ahd, waiting_h);
				next = ahd_inw(ahd, SCB_NEXT2);
			}
			ahd_set_scbptr(ahd, scbid);
			ahd_outw(ahd, SCB_NEXT2, next);
		}

		/* Return unpausing the sequencer. */
		return (0);
	}
	if (ahd->src_mode != AHD_MODE_SCSI) {
		u_int	scbid;
		struct	scb *scb;

		scbid = ahd_get_scbptr(ahd);
		scb = ahd_lookup_scb(ahd, scbid);
		ahd_print_path(ahd, scb);
		printf("Unexpected PKT busfree condition\n");
		ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb), 'A',
			       SCB_GET_LUN(scb), SCB_GET_TAG(scb),
			       ROLE_INITIATOR, CAM_UNEXP_BUSFREE);

		/* Return restarting the sequencer. */
		return (1);
	}
	printf("%s: Unexpected PKT busfree condition\n", ahd_name(ahd));
	ahd_dump_card_state(ahd);
	/* Restart the sequencer. */
	return (1);
}

/*
 * Non-packetized unexpected or expected busfree.
 */
static int
ahd_handle_nonpkt_busfree(struct ahd_softc *ahd)
{
	struct	ahd_devinfo devinfo;
	struct	scb *scb;
	u_int	lastphase;
	u_int	saved_scsiid;
	u_int	saved_lun;
	u_int	target;
	u_int	initiator_role_id;
	u_int	scbid;
	int	printerror;

	/*
	 * 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 = ahd_inb(ahd, LASTPHASE);
	saved_scsiid = ahd_inb(ahd, SAVED_SCSIID);
	saved_lun = ahd_inb(ahd, SAVED_LUN);
	target = SCSIID_TARGET(ahd, saved_scsiid);
	initiator_role_id = SCSIID_OUR_ID(saved_scsiid);
	ahd_compile_devinfo(&devinfo, initiator_role_id,
			    target, saved_lun, 'A', ROLE_INITIATOR);
	printerror = 1;

	scbid = ahd_get_scbptr(ahd);
	scb = ahd_lookup_scb(ahd, scbid);
	if (scb != NULL
	 && (ahd_inb(ahd, SEQ_FLAGS) & NOT_IDENTIFIED) != 0)
		scb = NULL;

	if (lastphase == P_MESGOUT) {
		u_int tag;

		tag = SCB_LIST_NULL;
		if (ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT_TAG, TRUE)
		 || ahd_sent_msg(ahd, AHDMSG_1B, MSG_ABORT, TRUE)) {
			int found;
			int sent_msg;

			sent_msg = ahd->msgout_buf[ahd->msgout_index - 1];
			ahd_print_path(ahd, scb);
			printf("SCB %d - Abort%s Completed.\n",
			       SCB_GET_TAG(scb),
			       sent_msg == MSG_ABORT_TAG ? "" : " Tag");

			if (sent_msg == MSG_ABORT_TAG)
				tag = SCB_GET_TAG(scb);

			if ((scb->flags & SCB_CMDPHASE_ABORT) != 0) {
				/*
				 * This abort is in response to an
				 * unexpected switch to command phase
				 * for a packetized connection.  Since
				 * the identify message was never sent,
				 * "saved lun" is 0.  We really want to
				 * abort only the SCB that encountered
				 * this error, which could have a different
				 * lun.  The SCB will be retried so the OS
				 * will see the UA after renegotiating to
				 * packetized.
				 */
				tag = SCB_GET_TAG(scb);
				saved_lun = scb->hscb->lun;
			}
			found = ahd_abort_scbs(ahd, target, 'A', saved_lun,
					       tag, ROLE_INITIATOR,
					       CAM_REQ_ABORTED);
			printf("found == 0x%x\n", found);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_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
			 && ahd_match_scb(ahd, scb, target, 'A',
					  CAM_LUN_WILDCARD, SCB_LIST_NULL,
					  ROLE_INITIATOR))
				ahd_set_transaction_status(scb, CAM_REQ_CMP);
#endif
			ahd_handle_devreset(ahd, &devinfo, CAM_BDR_SENT,
					    "Bus Device Reset",
					    /*verbose_level*/0);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_PPR, FALSE)) {
			struct ahd_initiator_tinfo *tinfo;
			struct ahd_tmode_tstate *tstate;

			/*
			 * PPR Rejected.  Try non-ppr negotiation
			 * and retry command.
			 */
			tinfo = ahd_fetch_transinfo(ahd, devinfo.channel,
						    devinfo.our_scsiid,
						    devinfo.target, &tstate);
			tinfo->curr.transport_version = 2;
			tinfo->goal.transport_version = 2;
			tinfo->goal.ppr_options = 0;
			ahd_qinfifo_requeue_tail(ahd, scb);
			printerror = 0;
		} else if (ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_WDTR, FALSE)
			|| ahd_sent_msg(ahd, AHDMSG_EXT, MSG_EXT_SDTR, FALSE)) {
			/*
			 * Negotiation Rejected.  Go-async and
			 * retry command.
			 */
			ahd_set_width(ahd, &devinfo,
				      MSG_EXT_WDTR_BUS_8_BIT,
				      AHD_TRANS_CUR|AHD_TRANS_GOAL,
				      /*paused*/TRUE);
			ahd_set_syncrate(ahd, &devinfo,
					/*period*/0, /*offset*/0,
					/*ppr_options*/0,
					AHD_TRANS_CUR|AHD_TRANS_GOAL,
					/*paused*/TRUE);
			ahd_qinfifo_requeue_tail(ahd, scb);
			printerror = 0;
		} else if ((ahd->msg_flags & MSG_FLAG_EXPECT_IDE_BUSFREE) != 0
			&& ahd_sent_msg(ahd, AHDMSG_1B,
					 MSG_INITIATOR_DET_ERR, TRUE)) {

#if AHD_DEBUG
			if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
				printf("Expected IDE Busfree\n");
#endif
			printerror = 0;
		}
	} else if (lastphase == P_MESGIN) {

		if ((ahd->msg_flags & MSG_FLAG_EXPECT_PPR_BUSFREE) != 0) {

			ahd_freeze_devq(ahd, scb);
			ahd_set_transaction_status(scb, CAM_REQUEUE_REQ);
			ahd_freeze_scb(scb);
			if ((ahd->msg_flags & MSG_FLAG_IU_REQ_CHANGED) != 0) {
				ahd_print_path(ahd, scb);
				printf("Now %spacketized.\n",
				       (scb->flags & SCB_PACKETIZED) == 0
				     ? "" : "non-");
				ahd_abort_scbs(ahd, SCB_GET_TARGET(ahd, scb),
					       SCB_GET_CHANNEL(ahd, scb),
					       SCB_GET_LUN(scb), SCB_LIST_NULL,
					       ROLE_INITIATOR, CAM_REQ_ABORTED);
			} else {
#if AHD_DEBUG
				if ((ahd_debug & AHD_SHOW_MESSAGES) != 0)
					printf("PPR Negotiation Busfree.\n");
#endif
				ahd_done(ahd, scb);
			}
			printerror = 0;
		}
	}
	if (printerror != 0) {
		int aborted;

		aborted = 0;
		if (scb != NULL) {
			u_int tag;

			if ((scb->hscb->control & TAG_ENB) != 0)
				tag = SCB_GET_TAG(scb);
			else
				tag = SCB_LIST_NULL;
			ahd_print_path(ahd, scb);
			aborted = ahd_abort_scbs(ahd, target, 'A',
				       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: ", ahd_name(ahd));
		}
		if (lastphase != P_BUSFREE)
			ahd_force_renegotiation(ahd, &devinfo);
		printf("Unexpected busfree %s, %d SCBs aborted, "
		       "PRGMCNT == 0x%x\n",
		       ahd_lookup_phase_entry(lastphase)->phasemsg,
		       aborted,
		       ahd_inb(ahd, PRGMCNT)
			| (ahd_inb(ahd, PRGMCNT+1) << 8));
		ahd_dump_card_state(ahd);
	}
	/* Always restart the sequencer. */
	return (1);
}

/*
 * Force renegotiation to occur the next time we initiate
 * a command to the current device.
 */
static void
ahd_force_renegotiation(struct ahd_softc *ahd, struct ahd_devinfo *devinfo)
{
	struct	ahd_initiator_tinfo *targ_info;
	struct	ahd_tmode_tstate *tstate;

	printf("Forcing renegotiation (%d:%c:%d)\n",
	       devinfo->our_scsiid, devinfo->channel, 
	       devinfo->target);
	targ_info = ahd_fetch_transinfo(ahd,
					devinfo->channel,
					devinfo->our_scsiid,
					devinfo->target,
					&tstate);
	ahd_update_neg_request(ahd, devinfo, tstate,
			       targ_info, /*force*/TRUE);
}

#define AHD_MAX_STEPS 2000
void
ahd_clear_critical_section(struct ahd_softc *ahd)
{
	ahd_mode_state	saved_modes;
	int		stepping;
	int		steps;
	u_int		simode0;
	u_int		simode1;
	u_int		simode3;
	u_int		lqimode0;
	u_int		lqimode1;
	u_int		lqomode0;
	u_int		lqomode1;

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

	stepping = FALSE;
	steps = 0;
	simode0 = 0;
	simode1 = 0;
	simode3 = 0;
	lqimode0 = 0;
	lqimode1 = 0;
	lqomode0 = 0;
	lqomode1 = 0;
	saved_modes = ahd_save_modes(ahd);
	for (;;) {
		struct	cs *cs;
		u_int	seqaddr;
		u_int	i;

		ahd_set_modes(ahd, AHD_MODE_SCSI, AHD_MODE_SCSI);
		seqaddr = ahd_inb(ahd, CURADDR)
			| (ahd_inb(ahd, CURADDR+1) << 8);

		cs = ahd->critical_sections;