The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/aic/aic.c

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    1 /*-
    2  * Copyright (c) 1999 Luoqi Chen.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/6.4/sys/dev/aic/aic.c 146734 2005-05-29 04:42:30Z nyan $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <sys/bus.h>
   34 
   35 #include <machine/bus.h>
   36 
   37 #include <cam/cam.h>
   38 #include <cam/cam_ccb.h>
   39 #include <cam/cam_sim.h>
   40 #include <cam/cam_xpt_sim.h>
   41 #include <cam/cam_debug.h>
   42 
   43 #include <cam/scsi/scsi_message.h>
   44 
   45 #include <dev/aic/aic6360reg.h>
   46 #include <dev/aic/aicvar.h>
   47 
   48 static void aic_action(struct cam_sim *sim, union ccb *ccb);
   49 static void aic_execute_scb(void *arg, bus_dma_segment_t *dm_segs,
   50                                 int nseg, int error);
   51 static void aic_start(struct aic_softc *aic);
   52 static void aic_select(struct aic_softc *aic);
   53 static void aic_selected(struct aic_softc *aic);
   54 static void aic_reselected(struct aic_softc *aic);
   55 static void aic_reconnect(struct aic_softc *aic, int tag);
   56 static void aic_cmd(struct aic_softc *aic);
   57 static void aic_msgin(struct aic_softc *aic);
   58 static void aic_handle_msgin(struct aic_softc *aic);
   59 static void aic_msgout(struct aic_softc *aic);
   60 static void aic_datain(struct aic_softc *aic);
   61 static void aic_dataout(struct aic_softc *aic);
   62 static void aic_done(struct aic_softc *aic, struct aic_scb *scb);
   63 static void aic_poll(struct cam_sim *sim);
   64 static void aic_timeout(void *arg);
   65 static void aic_scsi_reset(struct aic_softc *aic);
   66 static void aic_chip_reset(struct aic_softc *aic);
   67 static void aic_reset(struct aic_softc *aic, int initiate_reset);
   68 
   69 devclass_t aic_devclass;
   70 
   71 static struct aic_scb *free_scbs;
   72 
   73 static struct aic_scb *
   74 aic_get_scb(struct aic_softc *aic)
   75 {
   76         struct aic_scb *scb;
   77         int s = splcam();
   78         if ((scb = free_scbs) != NULL)
   79                 free_scbs = (struct aic_scb *)free_scbs->ccb;
   80         splx(s);
   81         return (scb);
   82 }
   83 
   84 static void
   85 aic_free_scb(struct aic_softc *aic, struct aic_scb *scb)
   86 {
   87         int s = splcam();
   88         if ((aic->flags & AIC_RESOURCE_SHORTAGE) != 0 &&
   89             (scb->ccb->ccb_h.status & CAM_RELEASE_SIMQ) == 0) {
   90                 scb->ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
   91                 aic->flags &= ~AIC_RESOURCE_SHORTAGE;
   92         }
   93         scb->flags = 0;
   94         scb->ccb = (union ccb *)free_scbs;
   95         free_scbs = scb;
   96         splx(s);
   97 }
   98 
   99 static void
  100 aic_action(struct cam_sim *sim, union ccb *ccb)
  101 {
  102         struct aic_softc *aic;
  103         int s;
  104 
  105         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("aic_action\n"));
  106 
  107         aic = (struct aic_softc *)cam_sim_softc(sim);
  108 
  109         switch (ccb->ccb_h.func_code) {
  110         case XPT_SCSI_IO:       /* Execute the requested I/O operation */
  111         case XPT_RESET_DEV:     /* Bus Device Reset the specified SCSI device */
  112         {               
  113                 struct aic_scb *scb;
  114 
  115                 if ((scb = aic_get_scb(aic)) == NULL) {
  116                         s = splcam();
  117                         aic->flags |= AIC_RESOURCE_SHORTAGE;
  118                         splx(s);
  119                         xpt_freeze_simq(aic->sim, /*count*/1);
  120                         ccb->ccb_h.status = CAM_REQUEUE_REQ;
  121                         xpt_done(ccb);
  122                         return;
  123                 }
  124 
  125                 scb->ccb = ccb;
  126                 ccb->ccb_h.ccb_scb_ptr = scb;
  127                 ccb->ccb_h.ccb_aic_ptr = aic;
  128 
  129                 scb->target = ccb->ccb_h.target_id;
  130                 scb->lun = ccb->ccb_h.target_lun;
  131 
  132                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
  133                         scb->cmd_len = ccb->csio.cdb_len;
  134                         if (ccb->ccb_h.flags & CAM_CDB_POINTER) {
  135                                 if (ccb->ccb_h.flags & CAM_CDB_PHYS) {
  136                                         ccb->ccb_h.status = CAM_REQ_INVALID;
  137                                         aic_free_scb(aic, scb);
  138                                         xpt_done(ccb);
  139                                         return;
  140                                 }
  141                                 scb->cmd_ptr = ccb->csio.cdb_io.cdb_ptr;
  142                         } else {
  143                                 scb->cmd_ptr = ccb->csio.cdb_io.cdb_bytes;
  144                         }
  145                         if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
  146                                 if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) ||
  147                                     (ccb->ccb_h.flags & CAM_DATA_PHYS)) {
  148                                         ccb->ccb_h.status = CAM_REQ_INVALID;
  149                                         aic_free_scb(aic, scb);
  150                                         xpt_done(ccb);
  151                                         return;
  152                                 }
  153                                 scb->data_ptr = ccb->csio.data_ptr;
  154                                 scb->data_len = ccb->csio.dxfer_len;
  155                         } else {
  156                                 scb->data_ptr = NULL;
  157                                 scb->data_len = 0;
  158                         }
  159                         aic_execute_scb(scb, NULL, 0, 0);
  160                 } else {
  161                         scb->flags |= SCB_DEVICE_RESET;
  162                         aic_execute_scb(scb, NULL, 0, 0);
  163                 }
  164                 break;
  165         }
  166         case XPT_SET_TRAN_SETTINGS:
  167         {
  168                 struct ccb_trans_settings *cts;
  169                 struct aic_tinfo *ti;
  170 
  171                 cts = &ccb->cts;
  172                 ti = &aic->tinfo[ccb->ccb_h.target_id];
  173 
  174                 s = splcam();
  175 
  176                 if ((cts->valid & CCB_TRANS_DISC_VALID) != 0 &&
  177                     (aic->flags & AIC_DISC_ENABLE) != 0) {
  178                         if ((cts->flags & CCB_TRANS_DISC_ENB) != 0)
  179                                 ti->flags |= TINFO_DISC_ENB;
  180                         else
  181                                 ti->flags &= ~TINFO_DISC_ENB;
  182                 }
  183 
  184                 if ((cts->valid & CCB_TRANS_TQ_VALID) != 0) {
  185                         if ((cts->flags & CCB_TRANS_TAG_ENB) != 0)
  186                                 ti->flags |= TINFO_TAG_ENB;
  187                         else
  188                                 ti->flags &= ~TINFO_TAG_ENB;
  189                 }
  190 
  191                 if ((cts->valid & CCB_TRANS_SYNC_RATE_VALID) != 0) {
  192                         ti->goal.period = cts->sync_period;
  193 
  194                         if (ti->goal.period > aic->min_period) {
  195                                 ti->goal.period = 0;
  196                                 ti->goal.offset = 0;
  197                         } else if (ti->goal.period < aic->max_period)
  198                                 ti->goal.period = aic->max_period;
  199                 }
  200 
  201                 if ((cts->valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0) {
  202                         ti->goal.offset = cts->sync_offset;
  203                         if (ti->goal.offset == 0)
  204                                 ti->goal.period = 0;
  205                         else if (ti->goal.offset > AIC_SYNC_OFFSET)
  206                                 ti->goal.offset = AIC_SYNC_OFFSET;
  207                 }
  208 
  209                 if ((ti->goal.period != ti->current.period)
  210                  || (ti->goal.offset != ti->current.offset))
  211                         ti->flags |= TINFO_SDTR_NEGO;
  212 
  213                 splx(s);
  214                 ccb->ccb_h.status = CAM_REQ_CMP;
  215                 xpt_done(ccb);
  216                 break;
  217         }
  218         case XPT_GET_TRAN_SETTINGS:
  219         {
  220                 struct ccb_trans_settings *cts;
  221                 struct aic_tinfo *ti;
  222 
  223                 cts = &ccb->cts;
  224                 ti = &aic->tinfo[ccb->ccb_h.target_id];
  225 
  226                 s = splcam();
  227 
  228                 cts->flags &= ~(CCB_TRANS_DISC_ENB|CCB_TRANS_TAG_ENB);
  229                 if ((ti->flags & TINFO_DISC_ENB) != 0)
  230                         cts->flags |= CCB_TRANS_DISC_ENB;
  231                 if ((ti->flags & TINFO_TAG_ENB) != 0)
  232                         cts->flags |= CCB_TRANS_TAG_ENB;
  233 
  234                 if ((cts->flags & CCB_TRANS_CURRENT_SETTINGS) != 0) {
  235                         cts->sync_period = ti->current.period;
  236                         cts->sync_offset = ti->current.offset;
  237                 } else {
  238                         cts->sync_period = ti->user.period;
  239                         cts->sync_offset = ti->user.offset;
  240                 }
  241                 cts->bus_width = MSG_EXT_WDTR_BUS_8_BIT;
  242 
  243                 splx(s);
  244 
  245                 cts->valid = CCB_TRANS_SYNC_RATE_VALID
  246                            | CCB_TRANS_SYNC_OFFSET_VALID
  247                            | CCB_TRANS_BUS_WIDTH_VALID
  248                            | CCB_TRANS_DISC_VALID
  249                            | CCB_TRANS_TQ_VALID;
  250 
  251                 ccb->ccb_h.status = CAM_REQ_CMP;
  252                 xpt_done(ccb);
  253                 break;
  254         }
  255         case XPT_CALC_GEOMETRY:
  256         {
  257                 cam_calc_geometry(&ccb->ccg, /*extended*/1);
  258                 xpt_done(ccb);
  259                 break;
  260         }
  261         case XPT_RESET_BUS:             /* Reset the specified SCSI bus */
  262                 aic_reset(aic, /*initiate_reset*/TRUE);
  263                 ccb->ccb_h.status = CAM_REQ_CMP;
  264                 xpt_done(ccb);
  265                 break;
  266         case XPT_PATH_INQ:              /* Path routing inquiry */
  267         {       
  268                 struct ccb_pathinq *cpi = &ccb->cpi;
  269 
  270                 cpi->version_num = 1; /* XXX??? */
  271                 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE;
  272                 cpi->target_sprt = 0;
  273                 cpi->hba_misc = 0;
  274                 cpi->hba_eng_cnt = 0;
  275                 cpi->max_target = 7;
  276                 cpi->max_lun = 7;
  277                 cpi->initiator_id = aic->initiator;
  278                 cpi->bus_id = cam_sim_bus(sim);
  279                 cpi->base_transfer_speed = 3300;
  280                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
  281                 strncpy(cpi->hba_vid, "Adaptec", HBA_IDLEN);
  282                 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
  283                 cpi->unit_number = cam_sim_unit(sim);
  284                 cpi->ccb_h.status = CAM_REQ_CMP;
  285                 xpt_done(ccb);
  286                 break;
  287         }
  288         default:
  289                 ccb->ccb_h.status = CAM_REQ_INVALID;
  290                 xpt_done(ccb);
  291                 break;
  292         }
  293 }
  294 
  295 static void
  296 aic_execute_scb(void *arg, bus_dma_segment_t *dm_segs, int nseg, int error)
  297 {
  298         struct aic_scb *scb = (struct aic_scb *)arg;
  299         union ccb *ccb = scb->ccb;
  300         struct aic_softc *aic = (struct aic_softc *)ccb->ccb_h.ccb_aic_ptr;
  301         int s;
  302 
  303         s = splcam();
  304 
  305         if (ccb->ccb_h.status != CAM_REQ_INPROG) {
  306                 splx(s);
  307                 aic_free_scb(aic, scb);
  308                 xpt_done(ccb);
  309                 return;
  310         }
  311 
  312         scb->flags |= SCB_ACTIVE;
  313         ccb->ccb_h.status |= CAM_SIM_QUEUED;
  314         TAILQ_INSERT_TAIL(&aic->pending_ccbs, &ccb->ccb_h, sim_links.tqe);
  315 
  316         ccb->ccb_h.timeout_ch = timeout(aic_timeout, (caddr_t)scb,
  317                 (ccb->ccb_h.timeout * hz) / 1000);
  318 
  319         aic_start(aic);
  320         splx(s);
  321 }
  322 
  323 /*
  324  * Start another command if the controller is not busy.
  325  */
  326 static void
  327 aic_start(struct aic_softc *aic)
  328 {
  329         struct ccb_hdr *ccb_h;
  330         struct aic_tinfo *ti;
  331 
  332         if (aic->state != AIC_IDLE)
  333                 return;
  334 
  335         TAILQ_FOREACH(ccb_h, &aic->pending_ccbs, sim_links.tqe) {
  336                 ti = &aic->tinfo[ccb_h->target_id];
  337                 if ((ti->lubusy & (1 << ccb_h->target_lun)) == 0) {
  338                         TAILQ_REMOVE(&aic->pending_ccbs, ccb_h, sim_links.tqe);
  339                         aic->nexus = (struct aic_scb *)ccb_h->ccb_scb_ptr;
  340                         aic_select(aic);
  341                         return;
  342                 }
  343         }
  344 
  345         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_start: idle\n"));
  346 
  347         aic_outb(aic, SIMODE0, ENSELDI);
  348         aic_outb(aic, SIMODE1, ENSCSIRST);
  349         aic_outb(aic, SCSISEQ, ENRESELI);
  350 }
  351 
  352 /*
  353  * Start a selection.
  354  */
  355 static void
  356 aic_select(struct aic_softc *aic)
  357 {
  358         struct aic_scb *scb = aic->nexus;
  359 
  360         CAM_DEBUG(scb->ccb->ccb_h.path, CAM_DEBUG_TRACE,
  361                   ("aic_select - ccb %p\n", scb->ccb));
  362 
  363         aic->state = AIC_SELECTING;
  364 
  365         aic_outb(aic, DMACNTRL1, 0);
  366         aic_outb(aic, SCSIID, aic->initiator << OID_S | scb->target);
  367         aic_outb(aic, SXFRCTL1, STIMO_256ms | ENSTIMER |
  368             (aic->flags & AIC_PARITY_ENABLE ? ENSPCHK : 0));
  369 
  370         aic_outb(aic, SIMODE0, ENSELDI|ENSELDO);
  371         aic_outb(aic, SIMODE1, ENSCSIRST|ENSELTIMO);
  372         aic_outb(aic, SCSISEQ, ENRESELI|ENSELO|ENAUTOATNO);
  373 }
  374 
  375 /*
  376  * We have successfully selected a target, prepare for the information
  377  * transfer phases.
  378  */
  379 static void
  380 aic_selected(struct aic_softc *aic)
  381 {
  382         struct aic_scb *scb = aic->nexus;
  383         union ccb *ccb = scb->ccb;
  384         struct aic_tinfo *ti = &aic->tinfo[scb->target];
  385 
  386         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
  387                   ("aic_selected - ccb %p\n", ccb));
  388 
  389         aic->state = AIC_HASNEXUS;
  390 
  391         if (scb->flags & SCB_DEVICE_RESET) {
  392                 aic->msg_buf[0] = MSG_BUS_DEV_RESET;
  393                 aic->msg_len = 1;
  394                 aic->msg_outq = AIC_MSG_MSGBUF;
  395         } else {
  396                 aic->msg_outq = AIC_MSG_IDENTIFY;
  397                 if ((ti->flags & TINFO_TAG_ENB) != 0 &&
  398                     (ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0)
  399                         aic->msg_outq |= AIC_MSG_TAG_Q;
  400                 else
  401                         ti->lubusy |= 1 << scb->lun;
  402                 if ((ti->flags & TINFO_SDTR_NEGO) != 0)
  403                         aic->msg_outq |= AIC_MSG_SDTR;
  404         }
  405 
  406         aic_outb(aic, CLRSINT0, CLRSELDO);
  407         aic_outb(aic, CLRSINT1, CLRBUSFREE);
  408         aic_outb(aic, SCSISEQ, ENAUTOATNP);
  409         aic_outb(aic, SIMODE0, 0);
  410         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
  411         aic_outb(aic, SCSIRATE, ti->scsirate);
  412 }
  413 
  414 /*
  415  * We are re-selected by a target, save the target id and wait for the
  416  * target to further identify itself.
  417  */
  418 static void
  419 aic_reselected(struct aic_softc *aic)
  420 {
  421         u_int8_t selid;
  422 
  423         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_reselected\n"));
  424 
  425         /*
  426          * If we have started a selection, it must have lost out in
  427          * the arbitration, put the command back to the pending queue.
  428          */
  429         if (aic->nexus) {
  430                 TAILQ_INSERT_HEAD(&aic->pending_ccbs,
  431                     &aic->nexus->ccb->ccb_h, sim_links.tqe);
  432                 aic->nexus = NULL;
  433         }
  434 
  435         selid = aic_inb(aic, SELID) & ~(1 << aic->initiator);
  436         if (selid & (selid - 1)) {
  437                 /* this should never have happened */
  438                 printf("aic_reselected: invalid selid %x\n", selid);
  439                 aic_reset(aic, /*initiate_reset*/TRUE);
  440                 return;
  441         }
  442 
  443         aic->state = AIC_RESELECTED;
  444         aic->target = ffs(selid) - 1;
  445         aic->lun = -1;
  446 
  447         aic_outb(aic, CLRSINT0, CLRSELDI);
  448         aic_outb(aic, CLRSINT1, CLRBUSFREE);
  449         aic_outb(aic, SIMODE0, 0);
  450         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
  451         aic_outb(aic, SCSISEQ, ENAUTOATNP);
  452         aic_outb(aic, SCSIRATE, aic->tinfo[aic->target].scsirate);
  453 }
  454 
  455 /*
  456  * Raise ATNO to signal the target that we have a message for it.
  457  */
  458 static __inline void
  459 aic_sched_msgout(struct aic_softc *aic, u_int8_t msg)
  460 {
  461         if (msg) {
  462                 aic->msg_buf[0] = msg;
  463                 aic->msg_len = 1;
  464         }
  465         aic->msg_outq |= AIC_MSG_MSGBUF;
  466         aic_outb(aic, SCSISIGO, aic_inb(aic, SCSISIGI) | ATNO);
  467 }
  468 
  469 /*
  470  * Wait for SPIORDY (SCSI PIO ready) flag, or a phase change.
  471  */
  472 static __inline int
  473 aic_spiordy(struct aic_softc *aic)
  474 {
  475         while (!(aic_inb(aic, DMASTAT) & INTSTAT) &&
  476             !(aic_inb(aic, SSTAT0) & SPIORDY))
  477                 ;
  478         return !(aic_inb(aic, DMASTAT) & INTSTAT);
  479 }
  480 
  481 /*
  482  * Reestablish a disconnected nexus.
  483  */
  484 static void
  485 aic_reconnect(struct aic_softc *aic, int tag)
  486 {
  487         struct aic_scb *scb;
  488         struct ccb_hdr *ccb_h;
  489 
  490         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_reconnect\n"));
  491 
  492         /* Find the nexus */
  493         scb = NULL;
  494         TAILQ_FOREACH(ccb_h, &aic->nexus_ccbs, sim_links.tqe) {
  495                 scb = (struct aic_scb *)ccb_h->ccb_scb_ptr;
  496                 if (scb->target == aic->target && scb->lun == aic->lun &&
  497                     (tag == -1 || scb->tag == tag))
  498                         break;
  499         }
  500 
  501         /* ABORT if nothing is found */
  502         if (!ccb_h) {
  503                 if (tag == -1)
  504                         aic_sched_msgout(aic, MSG_ABORT);
  505                 else
  506                         aic_sched_msgout(aic, MSG_ABORT_TAG);
  507                 xpt_async(AC_UNSOL_RESEL, aic->path, NULL);
  508                 return;
  509         }
  510 
  511         /* Reestablish the nexus */
  512         TAILQ_REMOVE(&aic->nexus_ccbs, ccb_h, sim_links.tqe);
  513         aic->nexus = scb;
  514         scb->flags &= ~SCB_DISCONNECTED;
  515         aic->state = AIC_HASNEXUS;
  516 }
  517 
  518 /*
  519  * Read messages.
  520  */
  521 static void
  522 aic_msgin(struct aic_softc *aic)
  523 {
  524         int msglen;
  525 
  526         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_msgin\n"));
  527 
  528         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
  529         aic_outb(aic, SXFRCTL0, CHEN|SPIOEN);
  530 
  531         aic->flags &= ~AIC_DROP_MSGIN;
  532         aic->msg_len = 0;
  533         do {
  534                 /*
  535                  * If a parity error is detected, drop the remaining
  536                  * bytes and inform the target so it could resend
  537                  * the messages.
  538                  */
  539                 if (aic_inb(aic, SSTAT1) & SCSIPERR) {
  540                         aic_outb(aic, CLRSINT1, CLRSCSIPERR);
  541                         aic->flags |= AIC_DROP_MSGIN;
  542                         aic_sched_msgout(aic, MSG_PARITY_ERROR);
  543                 }
  544                 if ((aic->flags & AIC_DROP_MSGIN)) {
  545                         aic_inb(aic, SCSIDAT);
  546                         continue;
  547                 }
  548                 /* read the message byte without ACKing on it */
  549                 aic->msg_buf[aic->msg_len++] = aic_inb(aic, SCSIBUS);
  550                 if (aic->msg_buf[0] == MSG_EXTENDED) {
  551                         if (aic->msg_len < 2) {
  552                                 (void) aic_inb(aic, SCSIDAT);
  553                                 continue;
  554                         }
  555                         switch (aic->msg_buf[2]) {
  556                         case MSG_EXT_SDTR:
  557                                 msglen = MSG_EXT_SDTR_LEN;
  558                                 break;
  559                         case MSG_EXT_WDTR:
  560                                 msglen = MSG_EXT_WDTR_LEN;
  561                                 break;
  562                         default:
  563                                 msglen = 0;
  564                                 break;
  565                         }
  566                         if (aic->msg_buf[1] != msglen) {
  567                                 aic->flags |= AIC_DROP_MSGIN;
  568                                 aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
  569                         }
  570                         msglen += 2;
  571                 } else if (aic->msg_buf[0] >= 0x20 && aic->msg_buf[0] <= 0x2f)
  572                         msglen = 2;
  573                 else
  574                         msglen = 1;
  575                 /*
  576                  * If we have a complete message, handle it before the final
  577                  * ACK (in case we decide to reject the message).
  578                  */
  579                 if (aic->msg_len == msglen) {
  580                         aic_handle_msgin(aic);
  581                         aic->msg_len = 0;
  582                 }
  583                 /* ACK on the message byte */
  584                 (void) aic_inb(aic, SCSIDAT);
  585         } while (aic_spiordy(aic));
  586 
  587         aic_outb(aic, SXFRCTL0, CHEN);
  588         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
  589 }
  590 
  591 /*
  592  * Handle a message.
  593  */
  594 static void
  595 aic_handle_msgin(struct aic_softc *aic)
  596 {
  597         struct aic_scb *scb;
  598         struct ccb_hdr *ccb_h;
  599         struct aic_tinfo *ti;
  600         struct ccb_trans_settings neg;
  601 
  602         if (aic->state == AIC_RESELECTED) {
  603                 if (!MSG_ISIDENTIFY(aic->msg_buf[0])) {
  604                         aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
  605                         return;
  606                 }
  607                 aic->lun = aic->msg_buf[0] & MSG_IDENTIFY_LUNMASK;
  608                 if (aic->tinfo[aic->target].lubusy & (1 << aic->lun))
  609                         aic_reconnect(aic, -1);
  610                 else
  611                         aic->state = AIC_RECONNECTING;
  612                 return;
  613         }
  614 
  615         if (aic->state == AIC_RECONNECTING) {
  616                 if (aic->msg_buf[0] != MSG_SIMPLE_Q_TAG) {
  617                         aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
  618                         return;
  619                 }
  620                 aic_reconnect(aic, aic->msg_buf[1]);
  621                 return;
  622         }
  623 
  624         switch (aic->msg_buf[0]) {
  625         case MSG_CMDCOMPLETE: {
  626                 struct ccb_scsiio *csio;
  627                 scb = aic->nexus;
  628                 ccb_h = &scb->ccb->ccb_h;
  629                 csio = &scb->ccb->csio;
  630                 if ((scb->flags & SCB_SENSE) != 0) {
  631                         /* auto REQUEST SENSE command */
  632                         scb->flags &= ~SCB_SENSE;
  633                         csio->sense_resid = scb->data_len;
  634                         if (scb->status == SCSI_STATUS_OK) {
  635                                 ccb_h->status |=
  636                                     CAM_SCSI_STATUS_ERROR|CAM_AUTOSNS_VALID;
  637                                 /*scsi_sense_print(csio);*/
  638                         } else {
  639                                 ccb_h->status |= CAM_AUTOSENSE_FAIL;
  640                                 printf("ccb %p sense failed %x\n",
  641                                     ccb_h, scb->status);
  642                         }
  643                 } else {
  644                         csio->scsi_status = scb->status;
  645                         csio->resid = scb->data_len;
  646                         if (scb->status == SCSI_STATUS_OK) {
  647                                 /* everything goes well */
  648                                 ccb_h->status |= CAM_REQ_CMP;
  649                         } else if ((ccb_h->flags & CAM_DIS_AUTOSENSE) == 0 &&
  650                             (csio->scsi_status == SCSI_STATUS_CHECK_COND ||
  651                              csio->scsi_status == SCSI_STATUS_CMD_TERMINATED)) {
  652                                 /* try to retrieve sense information */
  653                                 scb->flags |= SCB_SENSE;
  654                                 aic->flags |= AIC_BUSFREE_OK;
  655                                 return;
  656                         } else
  657                                 ccb_h->status |= CAM_SCSI_STATUS_ERROR;
  658                 }
  659                 aic_done(aic, scb);
  660                 aic->flags |= AIC_BUSFREE_OK;
  661                 break;
  662         }
  663         case MSG_EXTENDED:
  664                 switch (aic->msg_buf[2]) {
  665                 case MSG_EXT_SDTR:
  666                         scb = aic->nexus;
  667                         ti = &aic->tinfo[scb->target];
  668                         if (ti->flags & TINFO_SDTR_SENT) {
  669                                 ti->current.period = aic->msg_buf[3];
  670                                 ti->current.offset = aic->msg_buf[4];
  671                         } else {
  672                                 ti->current.period = aic->msg_buf[3] =
  673                                         max(ti->goal.period, aic->msg_buf[3]);
  674                                 ti->current.offset = aic->msg_buf[4] =
  675                                         min(ti->goal.offset, aic->msg_buf[4]);
  676                                 /*
  677                                  * The target initiated the negotiation,
  678                                  * send back a response.
  679                                  */
  680                                 aic_sched_msgout(aic, 0);
  681                         }
  682                         ti->flags &= ~(TINFO_SDTR_SENT|TINFO_SDTR_NEGO);
  683                         ti->scsirate = ti->current.offset ? ti->current.offset |
  684                             ((ti->current.period * 4 + 49) / 50 - 2) << 4 : 0;
  685                         aic_outb(aic, SCSIRATE, ti->scsirate);
  686                         neg.sync_period = ti->goal.period = ti->current.period;
  687                         neg.sync_offset = ti->goal.offset = ti->current.offset;
  688                         neg.valid = CCB_TRANS_SYNC_RATE_VALID
  689                                   | CCB_TRANS_SYNC_OFFSET_VALID;
  690                         ccb_h = &scb->ccb->ccb_h;
  691                         xpt_setup_ccb(&neg.ccb_h, ccb_h->path, 1);
  692                         xpt_async(AC_TRANSFER_NEG, ccb_h->path, &neg);
  693                         break;
  694                 case MSG_EXT_WDTR:
  695                 default:
  696                         aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
  697                         break;
  698                 }
  699                 break;
  700         case MSG_DISCONNECT:
  701                 scb = aic->nexus;
  702                 ccb_h = &scb->ccb->ccb_h;
  703                 TAILQ_INSERT_TAIL(&aic->nexus_ccbs, ccb_h, sim_links.tqe);
  704                 scb->flags |= SCB_DISCONNECTED;
  705                 aic->flags |= AIC_BUSFREE_OK;
  706                 aic->nexus = NULL;
  707                 CAM_DEBUG(ccb_h->path, CAM_DEBUG_TRACE, ("disconnected\n"));
  708                 break;
  709         case MSG_MESSAGE_REJECT:
  710                 switch (aic->msg_outq & -aic->msg_outq) {
  711                 case AIC_MSG_TAG_Q:
  712                         scb = aic->nexus;
  713                         ti = &aic->tinfo[scb->target];
  714                         ti->flags &= ~TINFO_TAG_ENB;
  715                         ti->lubusy |= 1 << scb->lun;
  716                         break;
  717                 case AIC_MSG_SDTR:
  718                         scb = aic->nexus;
  719                         ti = &aic->tinfo[scb->target];
  720                         ti->current.period = ti->goal.period = 0;
  721                         ti->current.offset = ti->goal.offset = 0;
  722                         ti->flags &= ~(TINFO_SDTR_SENT|TINFO_SDTR_NEGO);
  723                         ti->scsirate = 0;
  724                         aic_outb(aic, SCSIRATE, ti->scsirate);
  725                         neg.sync_period = ti->current.period;
  726                         neg.sync_offset = ti->current.offset;
  727                         neg.valid = CCB_TRANS_SYNC_RATE_VALID
  728                                   | CCB_TRANS_SYNC_OFFSET_VALID;
  729                         ccb_h = &scb->ccb->ccb_h;
  730                         xpt_setup_ccb(&neg.ccb_h, ccb_h->path, 1);
  731                         xpt_async(AC_TRANSFER_NEG, ccb_h->path, &neg);
  732                         break;
  733                 default:
  734                         break;
  735                 }
  736                 break;
  737         case MSG_SAVEDATAPOINTER:
  738                 break;  
  739         case MSG_RESTOREPOINTERS:
  740                 break;
  741         case MSG_NOOP:
  742                 break;
  743         default:
  744                 aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
  745                 break;
  746         }
  747 }
  748 
  749 /*
  750  * Send messages.
  751  */
  752 static void
  753 aic_msgout(struct aic_softc *aic)
  754 {
  755         struct aic_scb *scb;
  756         union ccb *ccb;
  757         struct aic_tinfo *ti;
  758         int msgidx = 0;
  759 
  760         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_msgout\n"));
  761 
  762         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
  763         aic_outb(aic, SXFRCTL0, CHEN|SPIOEN);
  764 
  765         /*
  766          * If the previous phase is also the message out phase,
  767          * we need to retransmit all the messages, probably
  768          * because the target has detected a parity error during
  769          * the past transmission.
  770          */
  771         if (aic->prev_phase == PH_MSGOUT)
  772                 aic->msg_outq = aic->msg_sent;
  773 
  774         do {
  775                 int q = aic->msg_outq;
  776                 if (msgidx > 0 && msgidx == aic->msg_len) {
  777                         /* complete message sent, start the next one */
  778                         q &= -q;
  779                         aic->msg_sent |= q;
  780                         aic->msg_outq ^= q;
  781                         q = aic->msg_outq;
  782                         msgidx = 0;
  783                 }
  784                 if (msgidx == 0) {
  785                         /* setup the message */
  786                         switch (q & -q) {
  787                         case AIC_MSG_IDENTIFY:
  788                                 scb = aic->nexus;
  789                                 ccb = scb->ccb;
  790                                 ti = &aic->tinfo[scb->target];
  791                                 aic->msg_buf[0] = MSG_IDENTIFY(scb->lun,
  792                                     (ti->flags & TINFO_DISC_ENB) &&
  793                                     !(ccb->ccb_h.flags & CAM_DIS_DISCONNECT));
  794                                 aic->msg_len = 1;
  795                                 break;
  796                         case AIC_MSG_TAG_Q:
  797                                 scb = aic->nexus;
  798                                 ccb = scb->ccb;
  799                                 aic->msg_buf[0] = ccb->csio.tag_action;
  800                                 aic->msg_buf[1] = scb->tag;
  801                                 aic->msg_len = 2;
  802                                 break;
  803                         case AIC_MSG_SDTR:
  804                                 scb = aic->nexus;
  805                                 ti = &aic->tinfo[scb->target];
  806                                 aic->msg_buf[0] = MSG_EXTENDED;
  807                                 aic->msg_buf[1] = MSG_EXT_SDTR_LEN;
  808                                 aic->msg_buf[2] = MSG_EXT_SDTR;
  809                                 aic->msg_buf[3] = ti->goal.period;
  810                                 aic->msg_buf[4] = ti->goal.offset;
  811                                 aic->msg_len = MSG_EXT_SDTR_LEN + 2;
  812                                 ti->flags |= TINFO_SDTR_SENT;
  813                                 break;
  814                         case AIC_MSG_MSGBUF:
  815                                 /* a single message already in the buffer */
  816                                 if (aic->msg_buf[0] == MSG_BUS_DEV_RESET ||
  817                                     aic->msg_buf[0] == MSG_ABORT ||
  818                                     aic->msg_buf[0] == MSG_ABORT_TAG)
  819                                         aic->flags |= AIC_BUSFREE_OK;
  820                                 break;
  821                         }
  822                 }
  823                 /*
  824                  * If this is the last message byte of all messages,
  825                  * clear ATNO to signal transmission complete.
  826                  */
  827                 if ((q & (q - 1)) == 0 && msgidx == aic->msg_len - 1)
  828                         aic_outb(aic, CLRSINT1, CLRATNO);
  829                 /* transmit the message byte */
  830                 aic_outb(aic, SCSIDAT, aic->msg_buf[msgidx++]);
  831         } while (aic_spiordy(aic));
  832 
  833         aic_outb(aic, SXFRCTL0, CHEN);
  834         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
  835 }
  836 
  837 /*
  838  * Read data bytes.
  839  */
  840 static void
  841 aic_datain(struct aic_softc *aic)
  842 {
  843         struct aic_scb *scb = aic->nexus;
  844         u_int8_t dmastat, dmacntrl0;
  845         int n;
  846 
  847         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_datain\n"));
  848 
  849         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
  850         aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
  851 
  852         dmacntrl0 = ENDMA;
  853         if (aic->flags & AIC_DWIO_ENABLE)
  854                 dmacntrl0 |= DWORDPIO;
  855         aic_outb(aic, DMACNTRL0, dmacntrl0);
  856 
  857         while (scb->data_len > 0) {
  858                 for (;;) {
  859                         /* wait for the fifo to fill up or a phase change */
  860                         dmastat = aic_inb(aic, DMASTAT);
  861                         if (dmastat & (INTSTAT|DFIFOFULL))
  862                                 break;
  863                 }
  864                 if (dmastat & DFIFOFULL) {
  865                         n = FIFOSIZE;
  866                 } else {
  867                         /*
  868                          * No more data, wait for the remaining bytes in
  869                          * the scsi fifo to be transfer to the host fifo.
  870                          */
  871                         while (!(aic_inb(aic, SSTAT2) & SEMPTY))
  872                                 ;
  873                         n = aic_inb(aic, FIFOSTAT);
  874                 }
  875                 n = imin(scb->data_len, n);
  876                 if (aic->flags & AIC_DWIO_ENABLE) {
  877                         if (n >= 12) {
  878                                 aic_insl(aic, DMADATALONG, scb->data_ptr, n>>2);
  879                                 scb->data_ptr += n & ~3;
  880                                 scb->data_len -= n & ~3;
  881                                 n &= 3;
  882                         }
  883                 } else {
  884                         if (n >= 8) {
  885                                 aic_insw(aic, DMADATA, scb->data_ptr, n >> 1);
  886                                 scb->data_ptr += n & ~1;
  887                                 scb->data_len -= n & ~1;
  888                                 n &= 1;
  889                         }
  890                 }
  891                 if (n) {
  892                         aic_outb(aic, DMACNTRL0, ENDMA|B8MODE);
  893                         aic_insb(aic, DMADATA, scb->data_ptr, n);
  894                         scb->data_ptr += n;
  895                         scb->data_len -= n;
  896                         aic_outb(aic, DMACNTRL0, dmacntrl0);
  897                 }
  898 
  899                 if (dmastat & INTSTAT)
  900                         break;
  901         }
  902 
  903         aic_outb(aic, SXFRCTL0, CHEN);
  904         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
  905 }
  906 
  907 /*
  908  * Send data bytes.
  909  */
  910 static void
  911 aic_dataout(struct aic_softc *aic)
  912 {
  913         struct aic_scb *scb = aic->nexus;
  914         u_int8_t dmastat, dmacntrl0, sstat2;
  915         int n;
  916 
  917         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_dataout\n"));
  918 
  919         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
  920         aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
  921 
  922         dmacntrl0 = ENDMA|WRITE;
  923         if (aic->flags & AIC_DWIO_ENABLE)
  924                 dmacntrl0 |= DWORDPIO;
  925         aic_outb(aic, DMACNTRL0, dmacntrl0);
  926 
  927         while (scb->data_len > 0) {
  928                 for (;;) {
  929                         /* wait for the fifo to clear up or a phase change */
  930                         dmastat = aic_inb(aic, DMASTAT);
  931                         if (dmastat & (INTSTAT|DFIFOEMP))
  932                                 break;
  933                 }
  934                 if (dmastat & INTSTAT)
  935                         break;
  936                 n = imin(scb->data_len, FIFOSIZE);
  937                 if (aic->flags & AIC_DWIO_ENABLE) {
  938                         if (n >= 12) {
  939                                 aic_outsl(aic, DMADATALONG, scb->data_ptr,n>>2);
  940                                 scb->data_ptr += n & ~3;
  941                                 scb->data_len -= n & ~3;
  942                                 n &= 3;
  943                         }
  944                 } else {
  945                         if (n >= 8) {
  946                                 aic_outsw(aic, DMADATA, scb->data_ptr, n >> 1);
  947                                 scb->data_ptr += n & ~1;
  948                                 scb->data_len -= n & ~1;
  949                                 n &= 1;
  950                         }
  951                 }
  952                 if (n) {
  953                         aic_outb(aic, DMACNTRL0, ENDMA|WRITE|B8MODE);
  954                         aic_outsb(aic, DMADATA, scb->data_ptr, n);
  955                         scb->data_ptr += n;
  956                         scb->data_len -= n;
  957                         aic_outb(aic, DMACNTRL0, dmacntrl0);
  958                 }
  959         }
  960 
  961         for (;;) {
  962                 /* wait until all bytes in the fifos are transmitted */
  963                 dmastat = aic_inb(aic, DMASTAT);
  964                 sstat2 = aic_inb(aic, SSTAT2);
  965                 if ((dmastat & DFIFOEMP) && (sstat2 & SEMPTY))
  966                         break;
  967                 if (dmastat & INTSTAT) {
  968                         /* adjust for untransmitted bytes */
  969                         n = aic_inb(aic, FIFOSTAT) + (sstat2 & 0xf);
  970                         scb->data_ptr -= n;
  971                         scb->data_len += n;
  972                         /* clear the fifo */
  973                         aic_outb(aic, SXFRCTL0, CHEN|CLRCH);
  974                         aic_outb(aic, DMACNTRL0, RSTFIFO);
  975                         break;
  976                 }
  977         }
  978 
  979         aic_outb(aic, SXFRCTL0, CHEN);
  980         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
  981 }
  982 
  983 /*
  984  * Send the scsi command.
  985  */
  986 static void
  987 aic_cmd(struct aic_softc *aic)
  988 {
  989         struct aic_scb *scb = aic->nexus;
  990         struct scsi_request_sense sense_cmd;
  991 
  992         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_cmd\n"));
  993 
  994         if (scb->flags & SCB_SENSE) {
  995                 /* autosense request */
  996                 sense_cmd.opcode = REQUEST_SENSE;
  997                 sense_cmd.byte2 = scb->lun << 5;
  998                 sense_cmd.length = scb->ccb->csio.sense_len;
  999                 sense_cmd.control = 0;
 1000                 sense_cmd.unused[0] = 0;
 1001                 sense_cmd.unused[1] = 0;
 1002                 scb->cmd_ptr = (u_int8_t *)&sense_cmd;
 1003                 scb->cmd_len = sizeof(sense_cmd);
 1004                 scb->data_ptr = (u_int8_t *)&scb->ccb->csio.sense_data;
 1005                 scb->data_len = scb->ccb->csio.sense_len;
 1006         }
 1007 
 1008         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
 1009         aic_outb(aic, DMACNTRL0, ENDMA|WRITE);
 1010         aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
 1011         aic_outsw(aic, DMADATA, (u_int16_t *)scb->cmd_ptr, scb->cmd_len >> 1);
 1012         while ((aic_inb(aic, SSTAT2) & SEMPTY) == 0 &&
 1013             (aic_inb(aic, DMASTAT) & INTSTAT) == 0)
 1014                 ;
 1015         aic_outb(aic, SXFRCTL0, CHEN);
 1016         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 1017 }
 1018 
 1019 /*
 1020  * Finish off a command. The caller is responsible to remove the ccb
 1021  * from any queue.
 1022  */
 1023 static void
 1024 aic_done(struct aic_softc *aic, struct aic_scb *scb)
 1025 {
 1026         union ccb *ccb = scb->ccb;
 1027 
 1028         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
 1029                   ("aic_done - ccb %p status %x resid %d\n",
 1030                    ccb, ccb->ccb_h.status, ccb->csio.resid));
 1031 
 1032         untimeout(aic_timeout, (caddr_t)scb, ccb->ccb_h.timeout_ch);
 1033 
 1034         if ((scb->flags & SCB_DEVICE_RESET) != 0 &&
 1035             ccb->ccb_h.func_code != XPT_RESET_DEV) {
 1036                 struct cam_path *path;
 1037                 struct ccb_hdr *ccb_h;
 1038                 cam_status error;
 1039 
 1040                 error = xpt_create_path(&path, /*periph*/NULL,
 1041                                         cam_sim_path(aic->sim),
 1042                                         scb->target,
 1043                                         CAM_LUN_WILDCARD);
 1044 
 1045                 if (error == CAM_REQ_CMP) {
 1046                         xpt_async(AC_SENT_BDR, path, NULL);
 1047                         xpt_free_path(path);
 1048                 }
 1049 
 1050                 ccb_h = TAILQ_FIRST(&aic->pending_ccbs);
 1051                 while (ccb_h != NULL) {
 1052                         struct aic_scb *pending_scb;
 1053 
 1054                         pending_scb = (struct aic_scb *)ccb_h->ccb_scb_ptr;
 1055                         if (ccb_h->target_id == scb->target) {
 1056                                 ccb_h->status |= CAM_BDR_SENT;
 1057                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
 1058                                 TAILQ_REMOVE(&aic->pending_ccbs,
 1059                                     &pending_scb->ccb->ccb_h, sim_links.tqe);
 1060                                 aic_done(aic, pending_scb);
 1061                         } else {
 1062                                 ccb_h->timeout_ch =
 1063                                     timeout(aic_timeout, (caddr_t)pending_scb,
 1064                                         (ccb_h->timeout * hz) / 1000);
 1065                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
 1066                         }
 1067                 }
 1068 
 1069                 ccb_h = TAILQ_FIRST(&aic->nexus_ccbs);
 1070                 while (ccb_h != NULL) {
 1071                         struct aic_scb *nexus_scb;
 1072 
 1073                         nexus_scb = (struct aic_scb *)ccb_h->ccb_scb_ptr;
 1074                         if (ccb_h->target_id == scb->target) {
 1075                                 ccb_h->status |= CAM_BDR_SENT;
 1076                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
 1077                                 TAILQ_REMOVE(&aic->nexus_ccbs,
 1078                                     &nexus_scb->ccb->ccb_h, sim_links.tqe);
 1079                                 aic_done(aic, nexus_scb);
 1080                         } else {
 1081                                 ccb_h->timeout_ch =
 1082                                     timeout(aic_timeout, (caddr_t)nexus_scb,
 1083                                         (ccb_h->timeout * hz) / 1000);
 1084                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
 1085                         }
 1086                 }
 1087         }
 1088 
 1089         if (aic->nexus == scb || scb->flags & SCB_DISCONNECTED)
 1090                 aic->tinfo[scb->target].lubusy &= ~(1 << scb->lun);
 1091         
 1092         if (aic->nexus == scb) {
 1093                 aic->nexus = NULL;
 1094         }
 1095         aic_free_scb(aic, scb);
 1096         xpt_done(ccb);
 1097 }
 1098 
 1099 static void
 1100 aic_poll(struct cam_sim *sim)
 1101 {
 1102         aic_intr(cam_sim_softc(sim));
 1103 }
 1104 
 1105 static void
 1106 aic_timeout(void *arg)
 1107 {
 1108         struct aic_scb *scb = (struct aic_scb *)arg;
 1109         union ccb *ccb = scb->ccb;
 1110         struct aic_softc *aic = (struct aic_softc *)ccb->ccb_h.ccb_aic_ptr;
 1111         int s;
 1112 
 1113         xpt_print_path(ccb->ccb_h.path);
 1114         printf("ccb %p - timed out", ccb);
 1115         if (aic->nexus && aic->nexus != scb)
 1116                 printf(", nexus %p", aic->nexus->ccb);
 1117         printf(", phase 0x%x, state %d\n", aic_inb(aic, SCSISIGI), aic->state);
 1118 
 1119         s = splcam();
 1120 
 1121         if ((scb->flags & SCB_ACTIVE) == 0) {
 1122                 splx(s);
 1123                 xpt_print_path(ccb->ccb_h.path);
 1124                 printf("ccb %p - timed out already completed\n", ccb);
 1125                 return;
 1126         }
 1127 
 1128         if ((scb->flags & SCB_DEVICE_RESET) == 0 && aic->nexus == scb) {
 1129                 struct ccb_hdr *ccb_h = &scb->ccb->ccb_h;
 1130 
 1131                 if ((ccb_h->status & CAM_RELEASE_SIMQ) == 0) {
 1132                         xpt_freeze_simq(aic->sim, /*count*/1);
 1133                         ccb_h->status |= CAM_RELEASE_SIMQ;
 1134                 }
 1135 
 1136                 TAILQ_FOREACH(ccb_h, &aic->pending_ccbs, sim_links.tqe) {
 1137                         untimeout(aic_timeout, (caddr_t)ccb_h->ccb_scb_ptr,
 1138                             ccb_h->timeout_ch);
 1139                 }
 1140 
 1141                 TAILQ_FOREACH(ccb_h, &aic->nexus_ccbs, sim_links.tqe) {
 1142                         untimeout(aic_timeout, (caddr_t)ccb_h->ccb_scb_ptr,
 1143                             ccb_h->timeout_ch);
 1144                 }
 1145 
 1146                 scb->flags |= SCB_DEVICE_RESET;
 1147                 ccb->ccb_h.timeout_ch =
 1148                     timeout(aic_timeout, (caddr_t)scb, 5 * hz);
 1149                 aic_sched_msgout(aic, MSG_BUS_DEV_RESET);
 1150         } else {
 1151                 if (aic->nexus == scb) {
 1152                         ccb->ccb_h.status |= CAM_CMD_TIMEOUT;
 1153                         aic_done(aic, scb);
 1154                 }
 1155                 aic_reset(aic, /*initiate_reset*/TRUE);
 1156         }
 1157 
 1158         splx(s);
 1159 }
 1160 
 1161 void
 1162 aic_intr(void *arg)
 1163 {
 1164         struct aic_softc *aic = (struct aic_softc *)arg;
 1165         u_int8_t sstat0, sstat1;
 1166         union ccb *ccb;
 1167         struct aic_scb *scb;
 1168 
 1169         if (!(aic_inb(aic, DMASTAT) & INTSTAT))
 1170                 return;
 1171 
 1172         aic_outb(aic, DMACNTRL0, 0);
 1173 
 1174         sstat0 = aic_inb(aic, SSTAT0);
 1175         sstat1 = aic_inb(aic, SSTAT1);
 1176 
 1177         if ((sstat1 & SCSIRSTI) != 0) {
 1178                 /* a device-initiated bus reset */
 1179                 aic_outb(aic, CLRSINT1, CLRSCSIRSTI);
 1180                 aic_reset(aic, /*initiate_reset*/FALSE);
 1181                 return;
 1182         }
 1183 
 1184         if ((sstat1 & SCSIPERR) != 0) {
 1185                 aic_outb(aic, CLRSINT1, CLRSCSIPERR);
 1186                 aic_sched_msgout(aic, MSG_PARITY_ERROR);
 1187                 aic_outb(aic, DMACNTRL0, INTEN);
 1188                 return;
 1189         }
 1190 
 1191         if (aic_inb(aic, SSTAT4)) {
 1192                 aic_outb(aic, CLRSERR, CLRSYNCERR|CLRFWERR|CLRFRERR);
 1193                 aic_reset(aic, /*initiate_reset*/TRUE);
 1194                 return;
 1195         }
 1196 
 1197         if (aic->state <= AIC_SELECTING) {
 1198                 if ((sstat0 & SELDI) != 0) {
 1199                         aic_reselected(aic);
 1200                         aic_outb(aic, DMACNTRL0, INTEN);
 1201                         return;
 1202                 }
 1203 
 1204                 if ((sstat0 & SELDO) != 0) {
 1205                         aic_selected(aic);
 1206                         aic_outb(aic, DMACNTRL0, INTEN);
 1207                         return;
 1208                 }
 1209 
 1210                 if ((sstat1 & SELTO) != 0) {
 1211                         scb = aic->nexus;
 1212                         ccb = scb->ccb;
 1213                         ccb->ccb_h.status = CAM_SEL_TIMEOUT;
 1214                         aic_done(aic, scb);
 1215                         while ((sstat1 & BUSFREE) == 0)
 1216                                 sstat1 = aic_inb(aic, SSTAT1);
 1217                         aic->flags |= AIC_BUSFREE_OK;
 1218                 }
 1219         }
 1220 
 1221         if ((sstat1 & BUSFREE) != 0) {
 1222                 aic_outb(aic, SCSISEQ, 0);
 1223                 aic_outb(aic, CLRSINT0, sstat0);
 1224                 aic_outb(aic, CLRSINT1, sstat1);
 1225                 if ((scb = aic->nexus)) {
 1226                         if ((aic->flags & AIC_BUSFREE_OK) == 0) {
 1227                                 ccb = scb->ccb;
 1228                                 ccb->ccb_h.status = CAM_UNEXP_BUSFREE;
 1229                                 aic_done(aic, scb);
 1230                         } else if (scb->flags & SCB_DEVICE_RESET) {
 1231                                 ccb = scb->ccb;
 1232                                 if (ccb->ccb_h.func_code == XPT_RESET_DEV) {
 1233                                         xpt_async(AC_SENT_BDR,
 1234                                             ccb->ccb_h.path, NULL);
 1235                                         ccb->ccb_h.status |= CAM_REQ_CMP;
 1236                                 } else
 1237                                         ccb->ccb_h.status |= CAM_CMD_TIMEOUT;
 1238                                 aic_done(aic, scb);
 1239                         } else if (scb->flags & SCB_SENSE) {
 1240                                 /* autosense request */
 1241                                 aic->flags &= ~AIC_BUSFREE_OK;
 1242                                 aic->tinfo[scb->target].lubusy &=
 1243                                     ~(1 << scb->lun);
 1244                                 aic_select(aic);
 1245                                 aic_outb(aic, DMACNTRL0, INTEN);
 1246                                 return;
 1247                         }
 1248                 }
 1249                 aic->flags &= ~AIC_BUSFREE_OK;
 1250                 aic->state = AIC_IDLE;
 1251                 aic_start(aic);
 1252                 aic_outb(aic, DMACNTRL0, INTEN);
 1253                 return;
 1254         }
 1255 
 1256         if ((sstat1 & REQINIT) != 0) {
 1257                 u_int8_t phase = aic_inb(aic, SCSISIGI) & PH_MASK;
 1258                 aic_outb(aic, SCSISIGO, phase);
 1259                 aic_outb(aic, CLRSINT1, CLRPHASECHG);
 1260 
 1261                 switch (phase) {
 1262                 case PH_MSGOUT:
 1263                         aic_msgout(aic);
 1264                         break;
 1265                 case PH_MSGIN:
 1266                         aic_msgin(aic);
 1267                         break;
 1268                 case PH_STAT:
 1269                         scb = aic->nexus;
 1270                         ccb = scb->ccb;
 1271                         aic_outb(aic, DMACNTRL0, 0);
 1272                         aic_outb(aic, SXFRCTL0, CHEN|SPIOEN);
 1273                         scb->status = aic_inb(aic, SCSIDAT);
 1274                         aic_outb(aic, SXFRCTL0, CHEN);
 1275                         break;
 1276                 case PH_CMD:
 1277                         aic_cmd(aic);
 1278                         break;
 1279                 case PH_DATAIN:
 1280                         aic_datain(aic);
 1281                         break;
 1282                 case PH_DATAOUT:
 1283                         aic_dataout(aic);
 1284                         break;
 1285                 }
 1286                 aic->prev_phase = phase;
 1287                 aic_outb(aic, DMACNTRL0, INTEN);
 1288                 return;
 1289         }
 1290 
 1291         printf("aic_intr: unexpected intr sstat0 %x sstat1 %x\n",
 1292                 sstat0, sstat1);
 1293         aic_outb(aic, DMACNTRL0, INTEN);
 1294 }
 1295 
 1296 /*
 1297  * Reset ourselves.
 1298  */
 1299 static void
 1300 aic_chip_reset(struct aic_softc *aic)
 1301 {
 1302         /*
 1303          * Doc. recommends to clear these two registers before
 1304          * operations commence
 1305          */
 1306         aic_outb(aic, SCSITEST, 0);
 1307         aic_outb(aic, TEST, 0);
 1308 
 1309         /* Reset SCSI-FIFO and abort any transfers */
 1310         aic_outb(aic, SXFRCTL0, CHEN|CLRCH|CLRSTCNT);
 1311 
 1312         /* Reset HOST-FIFO */
 1313         aic_outb(aic, DMACNTRL0, RSTFIFO);
 1314         aic_outb(aic, DMACNTRL1, 0);
 1315 
 1316         /* Disable all selection features */
 1317         aic_outb(aic, SCSISEQ, 0);
 1318         aic_outb(aic, SXFRCTL1, 0);
 1319 
 1320         /* Disable interrupts */
 1321         aic_outb(aic, SIMODE0, 0);
 1322         aic_outb(aic, SIMODE1, 0);
 1323 
 1324         /* Clear interrupts */
 1325         aic_outb(aic, CLRSINT0, 0x7f);
 1326         aic_outb(aic, CLRSINT1, 0xef);
 1327 
 1328         /* Disable synchronous transfers */
 1329         aic_outb(aic, SCSIRATE, 0);
 1330 
 1331         /* Haven't seen ant errors (yet) */
 1332         aic_outb(aic, CLRSERR, 0x07);
 1333 
 1334         /* Set our SCSI-ID */
 1335         aic_outb(aic, SCSIID, aic->initiator << OID_S);
 1336         aic_outb(aic, BRSTCNTRL, EISA_BRST_TIM);
 1337 }
 1338 
 1339 /*
 1340  * Reset the SCSI bus
 1341  */
 1342 static void
 1343 aic_scsi_reset(struct aic_softc *aic)
 1344 {
 1345         aic_outb(aic, SCSISEQ, SCSIRSTO);
 1346         DELAY(500);
 1347         aic_outb(aic, SCSISEQ, 0);
 1348         DELAY(50);
 1349 }
 1350 
 1351 /*
 1352  * Reset. Abort all pending commands.
 1353  */
 1354 static void
 1355 aic_reset(struct aic_softc *aic, int initiate_reset)
 1356 {
 1357         struct ccb_hdr *ccb_h;
 1358 
 1359         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_reset\n"));
 1360 
 1361         if (initiate_reset)
 1362                 aic_scsi_reset(aic);
 1363         aic_chip_reset(aic);
 1364 
 1365         xpt_async(AC_BUS_RESET, aic->path, NULL);
 1366 
 1367         while ((ccb_h = TAILQ_FIRST(&aic->pending_ccbs)) != NULL) {
 1368                 TAILQ_REMOVE(&aic->pending_ccbs, ccb_h, sim_links.tqe);
 1369                 ccb_h->status |= CAM_SCSI_BUS_RESET;
 1370                 aic_done(aic, (struct aic_scb *)ccb_h->ccb_scb_ptr);
 1371         }
 1372 
 1373         while ((ccb_h = TAILQ_FIRST(&aic->nexus_ccbs)) != NULL) {
 1374                 TAILQ_REMOVE(&aic->nexus_ccbs, ccb_h, sim_links.tqe);
 1375                 ccb_h->status |= CAM_SCSI_BUS_RESET;
 1376                 aic_done(aic, (struct aic_scb *)ccb_h->ccb_scb_ptr);
 1377         }
 1378 
 1379         if (aic->nexus) {
 1380                 ccb_h = &aic->nexus->ccb->ccb_h;
 1381                 ccb_h->status |= CAM_SCSI_BUS_RESET;
 1382                 aic_done(aic, aic->nexus);
 1383         }
 1384 
 1385         aic->state = AIC_IDLE;
 1386         aic_outb(aic, DMACNTRL0, INTEN);
 1387 }
 1388 
 1389 static char *aic_chip_names[] = {
 1390         "AIC6260", "AIC6360", "AIC6370", "GM82C700",
 1391 };
 1392 
 1393 static struct {
 1394         int type;
 1395         char *idstring;
 1396 } aic_chip_ids[] = {
 1397         { AIC6360, IDSTRING_AIC6360 },
 1398         { AIC6370, IDSTRING_AIC6370 },
 1399         { GM82C700, IDSTRING_GM82C700 },
 1400 };
 1401 
 1402 static void
 1403 aic_init(struct aic_softc *aic)
 1404 {
 1405         struct aic_scb *scb;
 1406         struct aic_tinfo *ti;
 1407         u_int8_t porta, portb;
 1408         char chip_id[33];
 1409         int i;
 1410 
 1411         TAILQ_INIT(&aic->pending_ccbs);
 1412         TAILQ_INIT(&aic->nexus_ccbs);
 1413         aic->nexus = NULL;
 1414         aic->state = AIC_IDLE;
 1415         aic->prev_phase = -1;
 1416         aic->flags = 0;
 1417 
 1418         aic_chip_reset(aic);
 1419         aic_scsi_reset(aic);
 1420 
 1421         /* determine the chip type from its ID string */
 1422         aic->chip_type = AIC6260;
 1423         aic_insb(aic, ID, chip_id, sizeof(chip_id) - 1);
 1424         chip_id[sizeof(chip_id) - 1] = '\0';
 1425         for (i = 0; i < sizeof(aic_chip_ids) / sizeof(aic_chip_ids[0]); i++) {
 1426                 if (!strcmp(chip_id, aic_chip_ids[i].idstring)) {
 1427                         aic->chip_type = aic_chip_ids[i].type;
 1428                         break;
 1429                 }
 1430         }
 1431 
 1432         porta = aic_inb(aic, PORTA);
 1433         portb = aic_inb(aic, PORTB);
 1434 
 1435         aic->initiator = PORTA_ID(porta);
 1436         if (PORTA_PARITY(porta))
 1437                 aic->flags |= AIC_PARITY_ENABLE;
 1438         if (PORTB_DISC(portb))
 1439                 aic->flags |= AIC_DISC_ENABLE;
 1440         if (PORTB_DMA(portb))
 1441                 aic->flags |= AIC_DMA_ENABLE;
 1442 
 1443         /*
 1444          * We can do fast SCSI (10MHz clock rate) if bit 4 of portb
 1445          * is set and we've got a 6360.  The 6260 can only do standard
 1446          * 5MHz SCSI.
 1447          */
 1448         if (aic->chip_type > AIC6260 || aic_inb(aic, REV)) {
 1449                 if (PORTB_FSYNC(portb))
 1450                         aic->flags |= AIC_FAST_ENABLE;
 1451                 aic->flags |= AIC_DWIO_ENABLE;
 1452         }
 1453 
 1454         if (aic->flags & AIC_FAST_ENABLE)
 1455                 aic->max_period = AIC_FAST_SYNC_PERIOD;
 1456         else
 1457                 aic->max_period = AIC_SYNC_PERIOD;
 1458         aic->min_period = AIC_MIN_SYNC_PERIOD;
 1459         
 1460         free_scbs = NULL;
 1461         for (i = 255; i >= 0; i--) {
 1462                 scb = &aic->scbs[i];
 1463                 scb->tag = i;
 1464                 aic_free_scb(aic, scb);
 1465         }
 1466 
 1467         for (i = 0; i < 8; i++) {
 1468                 if (i == aic->initiator)
 1469                         continue;
 1470                 ti = &aic->tinfo[i];
 1471                 bzero(ti, sizeof(*ti));
 1472                 ti->flags = TINFO_TAG_ENB;
 1473                 if (aic->flags & AIC_DISC_ENABLE)
 1474                         ti->flags |= TINFO_DISC_ENB;
 1475                 ti->user.period = aic->max_period;
 1476                 ti->user.offset = AIC_SYNC_OFFSET;
 1477                 ti->scsirate = 0;
 1478         }
 1479 
 1480         aic_outb(aic, DMACNTRL0, INTEN);
 1481 }
 1482 
 1483 int
 1484 aic_probe(struct aic_softc *aic)
 1485 {
 1486         int i;
 1487 
 1488         /* Remove aic6360 from possible powerdown mode */
 1489         aic_outb(aic, DMACNTRL0, 0);
 1490 
 1491 #define STSIZE  16
 1492         aic_outb(aic, DMACNTRL1, 0);    /* Reset stack pointer */
 1493         for (i = 0; i < STSIZE; i++)
 1494                 aic_outb(aic, STACK, i);
 1495 
 1496         /* See if we can pull out the same sequence */
 1497         aic_outb(aic, DMACNTRL1, 0);
 1498         for (i = 0; i < STSIZE && aic_inb(aic, STACK) == i; i++)
 1499                 ;
 1500         if (i != STSIZE)
 1501                 return (ENXIO);
 1502 #undef  STSIZE
 1503         return (0);
 1504 }
 1505 
 1506 int
 1507 aic_attach(struct aic_softc *aic)
 1508 {
 1509         struct cam_devq *devq;
 1510 
 1511         /*
 1512          * Create the device queue for our SIM.
 1513          */
 1514         devq = cam_simq_alloc(256);
 1515         if (devq == NULL)
 1516                 return (ENOMEM);
 1517 
 1518         /*
 1519          * Construct our SIM entry
 1520          */
 1521         aic->sim = cam_sim_alloc(aic_action, aic_poll, "aic", aic,
 1522                                  aic->unit, 2, 256, devq);
 1523         if (aic->sim == NULL) {
 1524                 cam_simq_free(devq);
 1525                 return (ENOMEM);
 1526         }
 1527 
 1528         if (xpt_bus_register(aic->sim, 0) != CAM_SUCCESS) {
 1529                 cam_sim_free(aic->sim, /*free_devq*/TRUE);
 1530                 return (ENXIO);
 1531         }
 1532 
 1533         if (xpt_create_path(&aic->path, /*periph*/NULL,
 1534                             cam_sim_path(aic->sim), CAM_TARGET_WILDCARD,
 1535                             CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
 1536                 xpt_bus_deregister(cam_sim_path(aic->sim));
 1537                 cam_sim_free(aic->sim, /*free_devq*/TRUE);
 1538                 return (ENXIO);
 1539         }
 1540 
 1541         aic_init(aic);
 1542 
 1543         printf("aic%d: %s", aic->unit, aic_chip_names[aic->chip_type]);
 1544         if (aic->flags & AIC_DMA_ENABLE)
 1545                 printf(", dma");
 1546         if (aic->flags & AIC_DISC_ENABLE)
 1547                 printf(", disconnection");
 1548         if (aic->flags & AIC_PARITY_ENABLE)
 1549                 printf(", parity check");
 1550         if (aic->flags & AIC_FAST_ENABLE)
 1551                 printf(", fast SCSI");
 1552         printf("\n");
 1553         return (0);
 1554 }
 1555 
 1556 int
 1557 aic_detach(struct aic_softc *aic)
 1558 {
 1559         xpt_async(AC_LOST_DEVICE, aic->path, NULL);
 1560         xpt_free_path(aic->path);
 1561         xpt_bus_deregister(cam_sim_path(aic->sim));
 1562         cam_sim_free(aic->sim, /*free_devq*/TRUE);
 1563         return (0);
 1564 }

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