aic7xxx_core.c

linux-2.6.15.6

ahc_validate_width(struct ahc_softc *ahc, struct ahc_initiator_tinfo *tinfo,
		   u_int *bus_width, role_t role)
{
	switch (*bus_width) {
	default:
		if (ahc->features & AHC_WIDE) {
			/* Respond Wide */
			*bus_width = MSG_EXT_WDTR_BUS_16_BIT;
			break;
		}
		/* FALLTHROUGH */
	case MSG_EXT_WDTR_BUS_8_BIT:
		*bus_width = MSG_EXT_WDTR_BUS_8_BIT;
		break;
	}
	if (tinfo != NULL) {
		if (role == ROLE_TARGET)
			*bus_width = MIN(tinfo->user.width, *bus_width);
		else
			*bus_width = MIN(tinfo->goal.width, *bus_width);
	}
}

/*
 * Update the bitmask of targets for which the controller should
 * negotiate with at the next convenient oportunity.  This currently
 * means the next time we send the initial identify messages for
 * a new transaction.
 */
int
ahc_update_neg_request(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
		       struct ahc_tmode_tstate *tstate,
		       struct ahc_initiator_tinfo *tinfo, ahc_neg_type neg_type)
{
	u_int auto_negotiate_orig;

	auto_negotiate_orig = tstate->auto_negotiate;
	if (neg_type == AHC_NEG_ALWAYS) {
		/*
		 * Force our "current" settings to be
		 * unknown so that unless a bus reset
		 * occurs the need to renegotiate is
		 * recorded persistently.
		 */
		if ((ahc->features & AHC_WIDE) != 0)
			tinfo->curr.width = AHC_WIDTH_UNKNOWN;
		tinfo->curr.period = AHC_PERIOD_UNKNOWN;
		tinfo->curr.offset = AHC_OFFSET_UNKNOWN;
	}
	if (tinfo->curr.period != tinfo->goal.period
	 || tinfo->curr.width != tinfo->goal.width
	 || tinfo->curr.offset != tinfo->goal.offset
	 || tinfo->curr.ppr_options != tinfo->goal.ppr_options
	 || (neg_type == AHC_NEG_IF_NON_ASYNC
	  && (tinfo->goal.offset != 0
	   || tinfo->goal.width != MSG_EXT_WDTR_BUS_8_BIT
	   || tinfo->goal.ppr_options != 0)))
		tstate->auto_negotiate |= devinfo->target_mask;
	else
		tstate->auto_negotiate &= ~devinfo->target_mask;

	return (auto_negotiate_orig != tstate->auto_negotiate);
}

/*
 * Update the user/goal/curr tables of synchronous negotiation
 * parameters as well as, in the case of a current or active update,
 * any data structures on the host controller.  In the case of an
 * active update, the specified target is currently talking to us on
 * the bus, so the transfer parameter update must take effect
 * immediately.
 */
void
ahc_set_syncrate(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
		 struct ahc_syncrate *syncrate, u_int period,
		 u_int offset, u_int ppr_options, u_int type, int paused)
{
	struct	ahc_initiator_tinfo *tinfo;
	struct	ahc_tmode_tstate *tstate;
	u_int	old_period;
	u_int	old_offset;
	u_int	old_ppr;
	int	active;
	int	update_needed;

	active = (type & AHC_TRANS_ACTIVE) == AHC_TRANS_ACTIVE;
	update_needed = 0;

	if (syncrate == NULL) {
		period = 0;
		offset = 0;
	}

	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
				    devinfo->target, &tstate);

	if ((type & AHC_TRANS_USER) != 0) {
		tinfo->user.period = period;
		tinfo->user.offset = offset;
		tinfo->user.ppr_options = ppr_options;
	}

	if ((type & AHC_TRANS_GOAL) != 0) {
		tinfo->goal.period = period;
		tinfo->goal.offset = offset;
		tinfo->goal.ppr_options = ppr_options;
	}

	old_period = tinfo->curr.period;
	old_offset = tinfo->curr.offset;
	old_ppr	   = tinfo->curr.ppr_options;

	if ((type & AHC_TRANS_CUR) != 0
	 && (old_period != period
	  || old_offset != offset
	  || old_ppr != ppr_options)) {
		u_int	scsirate;

		update_needed++;
		scsirate = tinfo->scsirate;
		if ((ahc->features & AHC_ULTRA2) != 0) {

			scsirate &= ~(SXFR_ULTRA2|SINGLE_EDGE|ENABLE_CRC);
			if (syncrate != NULL) {
				scsirate |= syncrate->sxfr_u2;
				if ((ppr_options & MSG_EXT_PPR_DT_REQ) != 0)
					scsirate |= ENABLE_CRC;
				else
					scsirate |= SINGLE_EDGE;
			}
		} else {

			scsirate &= ~(SXFR|SOFS);
			/*
			 * Ensure Ultra mode is set properly for
			 * this target.
			 */
			tstate->ultraenb &= ~devinfo->target_mask;
			if (syncrate != NULL) {
				if (syncrate->sxfr & ULTRA_SXFR) {
					tstate->ultraenb |=
						devinfo->target_mask;
				}
				scsirate |= syncrate->sxfr & SXFR;
				scsirate |= offset & SOFS;
			}
			if (active) {
				u_int sxfrctl0;

				sxfrctl0 = ahc_inb(ahc, SXFRCTL0);
				sxfrctl0 &= ~FAST20;
				if (tstate->ultraenb & devinfo->target_mask)
					sxfrctl0 |= FAST20;
				ahc_outb(ahc, SXFRCTL0, sxfrctl0);
			}
		}
		if (active) {
			ahc_outb(ahc, SCSIRATE, scsirate);
			if ((ahc->features & AHC_ULTRA2) != 0)
				ahc_outb(ahc, SCSIOFFSET, offset);
		}

		tinfo->scsirate = scsirate;
		tinfo->curr.period = period;
		tinfo->curr.offset = offset;
		tinfo->curr.ppr_options = ppr_options;

		ahc_send_async(ahc, devinfo->channel, devinfo->target,
			       CAM_LUN_WILDCARD, AC_TRANSFER_NEG, NULL);
		if (bootverbose) {
			if (offset != 0) {
				printf("%s: target %d synchronous at %sMHz%s, "
				       "offset = 0x%x\n", ahc_name(ahc),
				       devinfo->target, syncrate->rate,
				       (ppr_options & MSG_EXT_PPR_DT_REQ)
				       ? " DT" : "", offset);
			} else {
				printf("%s: target %d using "
				       "asynchronous transfers\n",
				       ahc_name(ahc), devinfo->target);
			}
		}
	}

	update_needed += ahc_update_neg_request(ahc, devinfo, tstate,
						tinfo, AHC_NEG_TO_GOAL);

	if (update_needed)
		ahc_update_pending_scbs(ahc);
}

/*
 * Update the user/goal/curr tables of wide negotiation
 * parameters as well as, in the case of a current or active update,
 * any data structures on the host controller.  In the case of an
 * active update, the specified target is currently talking to us on
 * the bus, so the transfer parameter update must take effect
 * immediately.
 */
void
ahc_set_width(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
	      u_int width, u_int type, int paused)
{
	struct	ahc_initiator_tinfo *tinfo;
	struct	ahc_tmode_tstate *tstate;
	u_int	oldwidth;
	int	active;
	int	update_needed;

	active = (type & AHC_TRANS_ACTIVE) == AHC_TRANS_ACTIVE;
	update_needed = 0;
	tinfo = ahc_fetch_transinfo(ahc, devinfo->channel, devinfo->our_scsiid,
				    devinfo->target, &tstate);

	if ((type & AHC_TRANS_USER) != 0)
		tinfo->user.width = width;

	if ((type & AHC_TRANS_GOAL) != 0)
		tinfo->goal.width = width;

	oldwidth = tinfo->curr.width;
	if ((type & AHC_TRANS_CUR) != 0 && oldwidth != width) {
		u_int	scsirate;

		update_needed++;
		scsirate =  tinfo->scsirate;
		scsirate &= ~WIDEXFER;
		if (width == MSG_EXT_WDTR_BUS_16_BIT)
			scsirate |= WIDEXFER;

		tinfo->scsirate = scsirate;

		if (active)
			ahc_outb(ahc, SCSIRATE, scsirate);

		tinfo->curr.width = width;

		ahc_send_async(ahc, devinfo->channel, devinfo->target,
			       CAM_LUN_WILDCARD, AC_TRANSFER_NEG, NULL);
		if (bootverbose) {
			printf("%s: target %d using %dbit transfers\n",
			       ahc_name(ahc), devinfo->target,
			       8 * (0x01 << width));
		}
	}

	update_needed += ahc_update_neg_request(ahc, devinfo, tstate,
						tinfo, AHC_NEG_TO_GOAL);
	if (update_needed)
		ahc_update_pending_scbs(ahc);
}

/*
 * Update the current state of tagged queuing for a given target.
 */
void
ahc_set_tags(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
	     ahc_queue_alg alg)
{
 	ahc_platform_set_tags(ahc, devinfo, alg);
 	ahc_send_async(ahc, devinfo->channel, devinfo->target,
 		       devinfo->lun, AC_TRANSFER_NEG, &alg);
}

/*
 * When the transfer settings for a connection change, update any
 * in-transit SCBs to contain the new data so the hardware will
 * be set correctly during future (re)selections.
 */
static void
ahc_update_pending_scbs(struct ahc_softc *ahc)
{
	struct	scb *pending_scb;
	int	pending_scb_count;
	int	i;
	int	paused;
	u_int	saved_scbptr;

	/*
	 * Traverse the pending SCB list and ensure that all of the
	 * SCBs there have the proper settings.
	 */
	pending_scb_count = 0;
	LIST_FOREACH(pending_scb, &ahc->pending_scbs, pending_links) {
		struct ahc_devinfo devinfo;
		struct hardware_scb *pending_hscb;
		struct ahc_initiator_tinfo *tinfo;
		struct ahc_tmode_tstate *tstate;

		ahc_scb_devinfo(ahc, &devinfo, pending_scb);
		tinfo = ahc_fetch_transinfo(ahc, devinfo.channel,
					    devinfo.our_scsiid,
					    devinfo.target, &tstate);
		pending_hscb = pending_scb->hscb;
		pending_hscb->control &= ~ULTRAENB;
		if ((tstate->ultraenb & devinfo.target_mask) != 0)
			pending_hscb->control |= ULTRAENB;
		pending_hscb->scsirate = tinfo->scsirate;
		pending_hscb->scsioffset = tinfo->curr.offset;
		if ((tstate->auto_negotiate & devinfo.target_mask) == 0
		 && (pending_scb->flags & SCB_AUTO_NEGOTIATE) != 0) {
			pending_scb->flags &= ~SCB_AUTO_NEGOTIATE;
			pending_hscb->control &= ~MK_MESSAGE;
		}
		ahc_sync_scb(ahc, pending_scb,
			     BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
		pending_scb_count++;
	}

	if (pending_scb_count == 0)
		return;

	if (ahc_is_paused(ahc)) {
		paused = 1;
	} else {
		paused = 0;
		ahc_pause(ahc);
	}

	saved_scbptr = ahc_inb(ahc, SCBPTR);
	/* Ensure that the hscbs down on the card match the new information */
	for (i = 0; i < ahc->scb_data->maxhscbs; i++) {
		struct	hardware_scb *pending_hscb;
		u_int	control;
		u_int	scb_tag;

		ahc_outb(ahc, SCBPTR, i);
		scb_tag = ahc_inb(ahc, SCB_TAG);
		pending_scb = ahc_lookup_scb(ahc, scb_tag);
		if (pending_scb == NULL)
			continue;

		pending_hscb = pending_scb->hscb;
		control = ahc_inb(ahc, SCB_CONTROL);
		control &= ~(ULTRAENB|MK_MESSAGE);
		control |= pending_hscb->control & (ULTRAENB|MK_MESSAGE);
		ahc_outb(ahc, SCB_CONTROL, control);
		ahc_outb(ahc, SCB_SCSIRATE, pending_hscb->scsirate);
		ahc_outb(ahc, SCB_SCSIOFFSET, pending_hscb->scsioffset);
	}
	ahc_outb(ahc, SCBPTR, saved_scbptr);

	if (paused == 0)
		ahc_unpause(ahc);
}

/**************************** Pathing Information *****************************/
static void
ahc_fetch_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
{
	u_int	saved_scsiid;
	role_t	role;
	int	our_id;

	if (ahc_inb(ahc, SSTAT0) & TARGET)
		role = ROLE_TARGET;
	else
		role = ROLE_INITIATOR;

	if (role == ROLE_TARGET
	 && (ahc->features & AHC_MULTI_TID) != 0
	 && (ahc_inb(ahc, SEQ_FLAGS)
 	   & (CMDPHASE_PENDING|TARG_CMD_PENDING|NO_DISCONNECT)) != 0) {
		/* We were selected, so pull our id from TARGIDIN */
		our_id = ahc_inb(ahc, TARGIDIN) & OID;
	} else if ((ahc->features & AHC_ULTRA2) != 0)
		our_id = ahc_inb(ahc, SCSIID_ULTRA2) & OID;
	else
		our_id = ahc_inb(ahc, SCSIID) & OID;

	saved_scsiid = ahc_inb(ahc, SAVED_SCSIID);
	ahc_compile_devinfo(devinfo,
			    our_id,
			    SCSIID_TARGET(ahc, saved_scsiid),
			    ahc_inb(ahc, SAVED_LUN),
			    SCSIID_CHANNEL(ahc, saved_scsiid),
			    role);
}

struct ahc_phase_table_entry*
ahc_lookup_phase_entry(int phase)
{
	struct ahc_phase_table_entry *entry;
	struct ahc_phase_table_entry *last_entry;

	/*
	 * num_phases doesn't include the default entry which
	 * will be returned if the phase doesn't match.
	 */
	last_entry = &ahc_phase_table[num_phases];
	for (entry = ahc_phase_table; entry < last_entry; entry++) {
		if (phase == entry->phase)
			break;
	}
	return (entry);
}

void
ahc_compile_devinfo(struct ahc_devinfo *devinfo, u_int our_id, u_int target,
		    u_int lun, char channel, role_t role)
{
	devinfo->our_scsiid = our_id;
	devinfo->target = target;
	devinfo->lun = lun;
	devinfo->target_offset = target;
	devinfo->channel = channel;
	devinfo->role = role;
	if (channel == 'B')
		devinfo->target_offset += 8;
	devinfo->target_mask = (0x01 << devinfo->target_offset);
}

void
ahc_print_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo)
{
	printf("%s:%c:%d:%d: ", ahc_name(ahc), devinfo->channel,
	       devinfo->target, devinfo->lun);
}

static void
ahc_scb_devinfo(struct ahc_softc *ahc, struct ahc_devinfo *devinfo,
		struct scb *scb)
{
	role_t	role;
	int	our_id;

	our_id = SCSIID_OUR_ID(scb->hscb->scsiid);
	role = ROLE_INITIATOR;
	if ((scb->flags & SCB_TARGET_SCB) != 0)
		role = ROLE_TARGET;
	ahc_compile_devinfo(devinfo, our_id, SCB_GET_TARGET(ahc, scb),
			    SCB_GET_LUN(scb), SCB_GET_CHANNEL(ahc, scb), role);
}


/************************ Message Phase Processing ****************************/
static void
ahc_assert_atn(struct ahc_softc *ahc)
{
	u_int scsisigo;

	scsisigo = ATNO;
	if ((ahc->features & AHC_DT) == 0)
		scsisigo |= ahc_inb(ahc, SCSISIGI);
	ahc_outb(ahc, SCSISIGO, scsisigo);
}

/*
 * When an initiator transaction with the MK_MESSAGE flag either reconnects
 * or enters the initial message out phase, we are interrupted.  Fill our
 * outgoing message buffer with the appr