sys/dev/disk/aic/aic.c

   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  * $FreeBSD: src/sys/dev/aic/aic.c,v 1.8 2000/01/14 23:42:35 imp Exp $
  27  * $DragonFly: src/sys/dev/disk/aic/aic.c,v 1.7 2005/06/16 15:38:36 joerg Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/malloc.h>
  33 #include <sys/buf.h>
  34 #include <sys/kernel.h>
  35 #include <sys/sysctl.h>
  36 #include <sys/thread2.h>
  37 #include <sys/bus.h>
  38
  39 #include <machine/bus_pio.h>
  40 #include <machine/bus.h>
  41 #include <machine/clock.h>
  42
  43 #include <bus/cam/cam.h>
  44 #include <bus/cam/cam_ccb.h>
  45 #include <bus/cam/cam_sim.h>
  46 #include <bus/cam/cam_xpt_sim.h>
  47 #include <bus/cam/cam_debug.h>
  48
  49 #include <bus/cam/scsi/scsi_message.h>
  50
  51 #include "aic6360reg.h"
  52 #include "aicvar.h"
  53
  54 static void aic_action (struct cam_sim *sim, union ccb *ccb);
  55 static void aic_execute_scb (void *arg, bus_dma_segment_t *dm_segs,
  56                                 int nseg, int error);
  57 static void aic_start (struct aic_softc *aic);
  58 static void aic_select (struct aic_softc *aic);
  59 static void aic_selected (struct aic_softc *aic);
  60 static void aic_reselected (struct aic_softc *aic);
  61 static void aic_reconnect (struct aic_softc *aic, int tag);
  62 static void aic_cmd (struct aic_softc *aic);
  63 static void aic_msgin (struct aic_softc *aic);
  64 static void aic_handle_msgin (struct aic_softc *aic);
  65 static void aic_msgout (struct aic_softc *aic);
  66 static void aic_datain (struct aic_softc *aic);
  67 static void aic_dataout (struct aic_softc *aic);
  68 static void aic_done (struct aic_softc *aic, struct aic_scb *scb);
  69 static void aic_poll (struct cam_sim *sim);
  70 static void aic_timeout (void *arg);
  71 static void aic_scsi_reset (struct aic_softc *aic);
  72 static void aic_chip_reset (struct aic_softc *aic);
  73 static void aic_reset (struct aic_softc *aic, int initiate_reset);
  74
  75 devclass_t aic_devclass;
  76
  77 static struct aic_scb *free_scbs;
  78
  79 static struct aic_scb *
  80 aic_get_scb(struct aic_softc *aic)
  81 {
  82         struct aic_scb *scb;
  83
  84         crit_enter();
  85
  86         if ((scb = free_scbs) != NULL)
  87                 free_scbs = (struct aic_scb *)free_scbs->ccb;
  88
  89         crit_exit();
  90         return (scb);
  91 }
  92
  93 static void
  94 aic_free_scb(struct aic_softc *aic, struct aic_scb *scb)
  95 {
  96         crit_enter();
  97
  98         if ((aic->flags & AIC_RESOURCE_SHORTAGE) != 0 &&
  99             (scb->ccb->ccb_h.status & CAM_RELEASE_SIMQ) == 0) {
 100                 scb->ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
 101                 aic->flags &= ~AIC_RESOURCE_SHORTAGE;
 102         }
 103         scb->flags = 0;
 104         scb->ccb = (union ccb *)free_scbs;
 105         free_scbs = scb;
 106
 107         crit_exit();
 108 }
 109
 110 static void
 111 aic_action(struct cam_sim *sim, union ccb *ccb)
 112 {
 113         struct aic_softc *aic;
 114
 115         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("aic_action\n"));
 116
 117         aic = (struct aic_softc *)cam_sim_softc(sim);
 118
 119         switch (ccb->ccb_h.func_code) {
 120         case XPT_SCSI_IO:       /* Execute the requested I/O operation */
 121         case XPT_RESET_DEV:     /* Bus Device Reset the specified SCSI device */
 122         {
 123                 struct aic_scb *scb;
 124
 125                 if ((scb = aic_get_scb(aic)) == NULL) {
 126                         crit_enter();
 127                         aic->flags |= AIC_RESOURCE_SHORTAGE;
 128                         crit_exit();
 129                         xpt_freeze_simq(aic->sim, /*count*/1);
 130                         ccb->ccb_h.status = CAM_REQUEUE_REQ;
 131                         xpt_done(ccb);
 132                         return;
 133                 }
 134
 135                 scb->ccb = ccb;
 136                 ccb->ccb_h.ccb_scb_ptr = scb;
 137                 ccb->ccb_h.ccb_aic_ptr = aic;
 138
 139                 scb->target = ccb->ccb_h.target_id;
 140                 scb->lun = ccb->ccb_h.target_lun;
 141
 142                 if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
 143                         scb->cmd_len = ccb->csio.cdb_len;
 144                         if (ccb->ccb_h.flags & CAM_CDB_POINTER) {
 145                                 if (ccb->ccb_h.flags & CAM_CDB_PHYS) {
 146                                         ccb->ccb_h.status = CAM_REQ_INVALID;
 147                                         aic_free_scb(aic, scb);
 148                                         xpt_done(ccb);
 149                                         return;
 150                                 }
 151                                 scb->cmd_ptr = ccb->csio.cdb_io.cdb_ptr;
 152                         } else {
 153                                 scb->cmd_ptr = ccb->csio.cdb_io.cdb_bytes;
 154                         }
 155                         if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
 156                                 if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) ||
 157                                     (ccb->ccb_h.flags & CAM_DATA_PHYS)) {
 158                                         ccb->ccb_h.status = CAM_REQ_INVALID;
 159                                         aic_free_scb(aic, scb);
 160                                         xpt_done(ccb);
 161                                         return;
 162                                 }
 163                                 scb->data_ptr = ccb->csio.data_ptr;
 164                                 scb->data_len = ccb->csio.dxfer_len;
 165                         } else {
 166                                 scb->data_ptr = NULL;
 167                                 scb->data_len = 0;
 168                         }
 169                         aic_execute_scb(scb, NULL, 0, 0);
 170                 } else {
 171                         scb->flags |= SCB_DEVICE_RESET;
 172                         aic_execute_scb(scb, NULL, 0, 0);
 173                 }
 174                 break;
 175         }
 176         case XPT_SET_TRAN_SETTINGS:
 177         {
 178                 struct ccb_trans_settings *cts;
 179                 struct aic_tinfo *ti;
 180
 181                 cts = &ccb->cts;
 182                 ti = &aic->tinfo[ccb->ccb_h.target_id];
 183
 184                 crit_enter();
 185
 186                 if ((cts->valid & CCB_TRANS_DISC_VALID) != 0 &&
 187                     (aic->flags & AIC_DISC_ENABLE) != 0) {
 188                         if ((cts->flags & CCB_TRANS_DISC_ENB) != 0)
 189                                 ti->flags |= TINFO_DISC_ENB;
 190                         else
 191                                 ti->flags &= ~TINFO_DISC_ENB;
 192                 }
 193
 194                 if ((cts->valid & CCB_TRANS_TQ_VALID) != 0) {
 195                         if ((cts->flags & CCB_TRANS_TAG_ENB) != 0)
 196                                 ti->flags |= TINFO_TAG_ENB;
 197                         else
 198                                 ti->flags &= ~TINFO_TAG_ENB;
 199                 }
 200
 201                 if ((cts->valid & CCB_TRANS_SYNC_RATE_VALID) != 0) {
 202                         ti->goal.period = cts->sync_period;
 203                         if (ti->goal.period != ti->current.period)
 204                                 ti->flags |= TINFO_SDTR_NEGO;
 205                 }
 206
 207                 if ((cts->valid & CCB_TRANS_SYNC_OFFSET_VALID) != 0) {
 208                         ti->goal.offset = cts->sync_offset;
 209                         if (ti->goal.offset != ti->current.offset)
 210                                 ti->flags |= TINFO_SDTR_NEGO;
 211                 }
 212
 213                 crit_exit();
 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                 crit_enter();
 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                 crit_exit();
 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                 struct ccb_calc_geometry *ccg;
 258                 u_int32_t size_mb;
 259                 u_int32_t secs_per_cylinder;
 260                 int extended = 0;
 261
 262                 ccg = &ccb->ccg;
 263                 size_mb = ccg->volume_size
 264                         / ((1024L * 1024L) / ccg->block_size);
 265
 266                 if (size_mb >= 1024 && extended) {
 267                         ccg->heads = 255;
 268                         ccg->secs_per_track = 63;
 269                 } else {
 270                         ccg->heads = 64;
 271                         ccg->secs_per_track = 32;
 272                 }
 273                 secs_per_cylinder = ccg->heads * ccg->secs_per_track;
 274                 ccg->cylinders = ccg->volume_size / secs_per_cylinder;
 275                 ccb->ccb_h.status = CAM_REQ_CMP;
 276                 xpt_done(ccb);
 277                 break;
 278         }
 279         case XPT_RESET_BUS:             /* Reset the specified SCSI bus */
 280                 aic_reset(aic, /*initiate_reset*/TRUE);
 281                 ccb->ccb_h.status = CAM_REQ_CMP;
 282                 xpt_done(ccb);
 283                 break;
 284         case XPT_PATH_INQ:              /* Path routing inquiry */
 285         {
 286                 struct ccb_pathinq *cpi = &ccb->cpi;
 287
 288                 cpi->version_num = 1; /* XXX??? */
 289                 cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE;
 290                 cpi->target_sprt = 0;
 291                 cpi->hba_misc = 0;
 292                 cpi->hba_eng_cnt = 0;
 293                 cpi->max_target = 7;
 294                 cpi->max_lun = 7;
 295                 cpi->initiator_id = aic->initiator;
 296                 cpi->bus_id = cam_sim_bus(sim);
 297                 cpi->base_transfer_speed = 3300;
 298                 strncpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
 299                 strncpy(cpi->hba_vid, "Adaptec", HBA_IDLEN);
 300                 strncpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
 301                 cpi->unit_number = cam_sim_unit(sim);
 302                 cpi->ccb_h.status = CAM_REQ_CMP;
 303                 xpt_done(ccb);
 304                 break;
 305         }
 306         default:
 307                 ccb->ccb_h.status = CAM_REQ_INVALID;
 308                 xpt_done(ccb);
 309                 break;
 310         }
 311 }
 312
 313 static void
 314 aic_execute_scb(void *arg, bus_dma_segment_t *dm_segs, int nseg, int error)
 315 {
 316         struct aic_scb *scb = (struct aic_scb *)arg;
 317         union ccb *ccb = scb->ccb;
 318         struct aic_softc *aic = (struct aic_softc *)ccb->ccb_h.ccb_aic_ptr;
 319
 320         crit_enter();
 321
 322         if (ccb->ccb_h.status != CAM_REQ_INPROG) {
 323                 crit_exit();
 324                 aic_free_scb(aic, scb);
 325                 xpt_done(ccb);
 326                 return;
 327         }
 328
 329         scb->flags |= SCB_ACTIVE;
 330         ccb->ccb_h.status |= CAM_SIM_QUEUED;
 331         TAILQ_INSERT_TAIL(&aic->pending_ccbs, &ccb->ccb_h, sim_links.tqe);
 332
 333         callout_reset(&ccb->ccb_h.timeout_ch, (ccb->ccb_h.timeout * hz) / 1000,
 334                       aic_timeout, scb);
 335
 336         aic_start(aic);
 337         crit_exit();
 338 }
 339
 340 /*
 341  * Start another command if the controller is not busy.
 342  */
 343 static void
 344 aic_start(struct aic_softc *aic)
 345 {
 346         struct ccb_hdr *ccb_h;
 347         struct aic_tinfo *ti;
 348
 349         if (aic->state != AIC_IDLE)
 350                 return;
 351
 352         TAILQ_FOREACH(ccb_h, &aic->pending_ccbs, sim_links.tqe) {
 353                 ti = &aic->tinfo[ccb_h->target_id];
 354                 if ((ti->lubusy & (1 << ccb_h->target_lun)) == 0) {
 355                         TAILQ_REMOVE(&aic->pending_ccbs, ccb_h, sim_links.tqe);
 356                         aic->nexus = (struct aic_scb *)ccb_h->ccb_scb_ptr;
 357                         aic_select(aic);
 358                         return;
 359                 }
 360         }
 361
 362         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_start: idle\n"));
 363
 364         aic_outb(aic, SIMODE0, ENSELDI);
 365         aic_outb(aic, SIMODE1, ENSCSIRST);
 366         aic_outb(aic, SCSISEQ, ENRESELI);
 367 }
 368
 369 /*
 370  * Start a selection.
 371  */
 372 static void
 373 aic_select(struct aic_softc *aic)
 374 {
 375         struct aic_scb *scb = aic->nexus;
 376
 377         CAM_DEBUG(scb->ccb->ccb_h.path, CAM_DEBUG_TRACE,
 378                   ("aic_select - ccb %p\n", scb->ccb));
 379
 380         aic->state = AIC_SELECTING;
 381
 382         aic_outb(aic, DMACNTRL1, 0);
 383         aic_outb(aic, SCSIID, aic->initiator << OID_S | scb->target);
 384         aic_outb(aic, SXFRCTL1, STIMO_256ms | ENSTIMER |
 385             (aic->flags & AIC_PARITY_ENABLE ? ENSPCHK : 0));
 386
 387         aic_outb(aic, SIMODE0, ENSELDI|ENSELDO);
 388         aic_outb(aic, SIMODE1, ENSCSIRST|ENSELTIMO);
 389         aic_outb(aic, SCSISEQ, ENRESELI|ENSELO|ENAUTOATNO);
 390 }
 391
 392 /*
 393  * We have successfully selected a target, prepare for the information
 394  * transfer phases.
 395  */
 396 static void
 397 aic_selected(struct aic_softc *aic)
 398 {
 399         struct aic_scb *scb = aic->nexus;
 400         union ccb *ccb = scb->ccb;
 401         struct aic_tinfo *ti = &aic->tinfo[scb->target];
 402
 403         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
 404                   ("aic_selected - ccb %p\n", ccb));
 405
 406         aic->state = AIC_HASNEXUS;
 407
 408         if (scb->flags & SCB_DEVICE_RESET) {
 409                 aic->msg_buf[0] = MSG_BUS_DEV_RESET;
 410                 aic->msg_len = 1;
 411                 aic->msg_outq = AIC_MSG_MSGBUF;
 412         } else {
 413                 aic->msg_outq = AIC_MSG_IDENTIFY;
 414                 if ((ti->flags & TINFO_TAG_ENB) != 0 &&
 415                     (ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0)
 416                         aic->msg_outq |= AIC_MSG_TAG_Q;
 417                 else
 418                         ti->lubusy |= 1 << scb->lun;
 419                 if ((ti->flags & TINFO_SDTR_NEGO) != 0)
 420                         aic->msg_outq |= AIC_MSG_SDTR;
 421         }
 422
 423         aic_outb(aic, CLRSINT0, CLRSELDO);
 424         aic_outb(aic, CLRSINT1, CLRBUSFREE);
 425         aic_outb(aic, SCSISEQ, ENAUTOATNP);
 426         aic_outb(aic, SIMODE0, 0);
 427         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 428         aic_outb(aic, SCSIRATE, ti->scsirate);
 429 }
 430
 431 /*
 432  * We are re-selected by a target, save the target id and wait for the
 433  * target to further identify itself.
 434  */
 435 static void
 436 aic_reselected(struct aic_softc *aic)
 437 {
 438         u_int8_t selid;
 439
 440         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_reselected\n"));
 441
 442         /*
 443          * If we have started a selection, it must have lost out in
 444          * the arbitration, put the command back to the pending queue.
 445          */
 446         if (aic->nexus) {
 447                 TAILQ_INSERT_HEAD(&aic->pending_ccbs,
 448                     &aic->nexus->ccb->ccb_h, sim_links.tqe);
 449                 aic->nexus = NULL;
 450         }
 451
 452         selid = aic_inb(aic, SELID) & ~(1 << aic->initiator);
 453         if (selid & (selid - 1)) {
 454                 /* this should never have happened */
 455                 printf("aic_reselected: invalid selid %x\n", selid);
 456                 aic_reset(aic, /*initiate_reset*/TRUE);
 457                 return;
 458         }
 459
 460         aic->state = AIC_RESELECTED;
 461         aic->target = ffs(selid) - 1;
 462         aic->lun = -1;
 463
 464         aic_outb(aic, CLRSINT0, CLRSELDI);
 465         aic_outb(aic, CLRSINT1, CLRBUSFREE);
 466         aic_outb(aic, SIMODE0, 0);
 467         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 468         aic_outb(aic, SCSISEQ, ENAUTOATNP);
 469         aic_outb(aic, SCSIRATE, aic->tinfo[aic->target].scsirate);
 470 }
 471
 472 /*
 473  * Raise ATNO to signal the target that we have a message for it.
 474  */
 475 static __inline void
 476 aic_sched_msgout(struct aic_softc *aic, u_int8_t msg)
 477 {
 478         if (msg) {
 479                 aic->msg_buf[0] = msg;
 480                 aic->msg_len = 1;
 481         }
 482         aic->msg_outq |= AIC_MSG_MSGBUF;
 483         aic_outb(aic, SCSISIGO, aic_inb(aic, SCSISIGI) | ATNO);
 484 }
 485
 486 /*
 487  * Wait for SPIORDY (SCSI PIO ready) flag, or a phase change.
 488  */
 489 static __inline int
 490 aic_spiordy(struct aic_softc *aic)
 491 {
 492         while (!(aic_inb(aic, DMASTAT) & INTSTAT) &&
 493             !(aic_inb(aic, SSTAT0) & SPIORDY))
 494                 ;
 495         return !(aic_inb(aic, DMASTAT) & INTSTAT);
 496 }
 497
 498 /*
 499  * Reestablish a disconnected nexus.
 500  */
 501 void
 502 aic_reconnect(struct aic_softc *aic, int tag)
 503 {
 504         struct aic_scb *scb;
 505         struct ccb_hdr *ccb_h;
 506
 507         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_reconnect\n"));
 508
 509         /* Find the nexus */
 510         TAILQ_FOREACH(ccb_h, &aic->nexus_ccbs, sim_links.tqe) {
 511                 scb = (struct aic_scb *)ccb_h->ccb_scb_ptr;
 512                 if (scb->target == aic->target && scb->lun == aic->lun &&
 513                     (tag == -1 || scb->tag == tag))
 514                         break;
 515         }
 516
 517         /* ABORT if nothing is found */
 518         if (!ccb_h) {
 519                 if (tag == -1)
 520                         aic_sched_msgout(aic, MSG_ABORT);
 521                 else
 522                         aic_sched_msgout(aic, MSG_ABORT_TAG);
 523                 xpt_async(AC_UNSOL_RESEL, aic->path, NULL);
 524                 return;
 525         }
 526
 527         /* Reestablish the nexus */
 528         TAILQ_REMOVE(&aic->nexus_ccbs, ccb_h, sim_links.tqe);
 529         aic->nexus = scb;
 530         scb->flags &= ~SCB_DISCONNECTED;
 531         aic->state = AIC_HASNEXUS;
 532 }
 533
 534 /*
 535  * Read messages.
 536  */
 537 static void
 538 aic_msgin(struct aic_softc *aic)
 539 {
 540         int msglen;
 541
 542         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_msgin\n"));
 543
 544         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
 545         aic_outb(aic, SXFRCTL0, CHEN|SPIOEN);
 546
 547         aic->flags &= ~AIC_DROP_MSGIN;
 548         aic->msg_len = 0;
 549         do {
 550                 /*
 551                  * If a parity error is detected, drop the remaining
 552                  * bytes and inform the target so it could resend
 553                  * the messages.
 554                  */
 555                 if (aic_inb(aic, SSTAT1) & SCSIPERR) {
 556                         aic_outb(aic, CLRSINT1, CLRSCSIPERR);
 557                         aic->flags |= AIC_DROP_MSGIN;
 558                         aic_sched_msgout(aic, MSG_PARITY_ERROR);
 559                 }
 560                 if ((aic->flags & AIC_DROP_MSGIN)) {
 561                         aic_inb(aic, SCSIDAT);
 562                         continue;
 563                 }
 564                 /* read the message byte without ACKing on it */
 565                 aic->msg_buf[aic->msg_len++] = aic_inb(aic, SCSIBUS);
 566                 if (aic->msg_buf[0] == MSG_EXTENDED) {
 567                         if (aic->msg_len < 2) {
 568                                 (void) aic_inb(aic, SCSIDAT);
 569                                 continue;
 570                         }
 571                         switch (aic->msg_buf[2]) {
 572                         case MSG_EXT_SDTR:
 573                                 msglen = MSG_EXT_SDTR_LEN;
 574                                 break;
 575                         case MSG_EXT_WDTR:
 576                                 msglen = MSG_EXT_WDTR_LEN;
 577                                 break;
 578                         default:
 579                                 msglen = 0;
 580                                 break;
 581                         }
 582                         if (aic->msg_buf[1] != msglen) {
 583                                 aic->flags |= AIC_DROP_MSGIN;
 584                                 aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
 585                         }
 586                         msglen += 2;
 587                 } else if (aic->msg_buf[0] >= 0x20 && aic->msg_buf[0] <= 0x2f)
 588                         msglen = 2;
 589                 else
 590                         msglen = 1;
 591                 /*
 592                  * If we have a complete message, handle it before the final
 593                  * ACK (in case we decide to reject the message).
 594                  */
 595                 if (aic->msg_len == msglen) {
 596                         aic_handle_msgin(aic);
 597                         aic->msg_len = 0;
 598                 }
 599                 /* ACK on the message byte */
 600                 (void) aic_inb(aic, SCSIDAT);
 601         } while (aic_spiordy(aic));
 602
 603         aic_outb(aic, SXFRCTL0, CHEN);
 604         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 605 }
 606
 607 /*
 608  * Handle a message.
 609  */
 610 static void
 611 aic_handle_msgin(struct aic_softc *aic)
 612 {
 613         struct aic_scb *scb;
 614         struct ccb_hdr *ccb_h;
 615         struct aic_tinfo *ti;
 616         struct ccb_trans_settings neg;
 617
 618         if (aic->state == AIC_RESELECTED) {
 619                 if (!MSG_ISIDENTIFY(aic->msg_buf[0])) {
 620                         aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
 621                         return;
 622                 }
 623                 aic->lun = aic->msg_buf[0] & MSG_IDENTIFY_LUNMASK;
 624                 if (aic->tinfo[aic->target].lubusy & (1 << aic->lun))
 625                         aic_reconnect(aic, -1);
 626                 else
 627                         aic->state = AIC_RECONNECTING;
 628                 return;
 629         }
 630
 631         if (aic->state == AIC_RECONNECTING) {
 632                 if (aic->msg_buf[0] != MSG_SIMPLE_Q_TAG) {
 633                         aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
 634                         return;
 635                 }
 636                 aic_reconnect(aic, aic->msg_buf[1]);
 637                 return;
 638         }
 639
 640         switch (aic->msg_buf[0]) {
 641         case MSG_CMDCOMPLETE: {
 642                 struct ccb_scsiio *csio;
 643                 scb = aic->nexus;
 644                 ccb_h = &scb->ccb->ccb_h;
 645                 csio = &scb->ccb->csio;
 646                 if ((scb->flags & SCB_SENSE) != 0) {
 647                         /* auto REQUEST SENSE command */
 648                         scb->flags &= ~SCB_SENSE;
 649                         csio->sense_resid = scb->data_len;
 650                         if (scb->status == SCSI_STATUS_OK) {
 651                                 ccb_h->status |=
 652                                     CAM_SCSI_STATUS_ERROR|CAM_AUTOSNS_VALID;
 653                                 /*scsi_sense_print(csio);*/
 654                         } else {
 655                                 ccb_h->status |= CAM_AUTOSENSE_FAIL;
 656                                 printf("ccb %p sense failed %x\n",
 657                                     ccb_h, scb->status);
 658                         }
 659                 } else {
 660                         csio->scsi_status = scb->status;
 661                         csio->resid = scb->data_len;
 662                         if (scb->status == SCSI_STATUS_OK) {
 663                                 /* everything goes well */
 664                                 ccb_h->status |= CAM_REQ_CMP;
 665                         } else if ((ccb_h->flags & CAM_DIS_AUTOSENSE) == 0 &&
 666                             (csio->scsi_status == SCSI_STATUS_CHECK_COND ||
 667                              csio->scsi_status == SCSI_STATUS_CMD_TERMINATED)) {
 668                                 /* try to retrieve sense information */
 669                                 scb->flags |= SCB_SENSE;
 670                                 aic->flags |= AIC_BUSFREE_OK;
 671                                 return;
 672                         } else
 673                                 ccb_h->status |= CAM_SCSI_STATUS_ERROR;
 674                 }
 675                 aic_done(aic, scb);
 676                 aic->flags |= AIC_BUSFREE_OK;
 677                 break;
 678         }
 679         case MSG_EXTENDED:
 680                 switch (aic->msg_buf[2]) {
 681                 case MSG_EXT_SDTR:
 682                         scb = aic->nexus;
 683                         ti = &aic->tinfo[scb->target];
 684                         if (ti->flags & TINFO_SDTR_SENT) {
 685                                 ti->current.period = aic->msg_buf[3];
 686                                 ti->current.offset = aic->msg_buf[4];
 687                         } else {
 688                                 ti->current.period = aic->msg_buf[3] =
 689                                         max(ti->goal.period, aic->msg_buf[3]);
 690                                 ti->current.offset = aic->msg_buf[4] =
 691                                         min(ti->goal.offset, aic->msg_buf[4]);
 692                                 /*
 693                                  * The target initiated the negotiation,
 694                                  * send back a response.
 695                                  */
 696                                 aic_sched_msgout(aic, 0);
 697                         }
 698                         ti->flags &= ~(TINFO_SDTR_SENT|TINFO_SDTR_NEGO);
 699                         ti->scsirate = ti->current.offset ? ti->current.offset |
 700                             ((ti->current.period * 4 + 49) / 50 - 2) << 4 : 0;
 701                         aic_outb(aic, SCSIRATE, ti->scsirate);
 702                         neg.sync_period = ti->goal.period = ti->current.period;
 703                         neg.sync_offset = ti->goal.offset = ti->current.offset;
 704                         neg.valid = CCB_TRANS_SYNC_RATE_VALID
 705                                   | CCB_TRANS_SYNC_OFFSET_VALID;
 706                         ccb_h = &scb->ccb->ccb_h;
 707                         xpt_setup_ccb(&neg.ccb_h, ccb_h->path, 1);
 708                         xpt_async(AC_TRANSFER_NEG, ccb_h->path, &neg);
 709                         break;
 710                 case MSG_EXT_WDTR:
 711                 default:
 712                         aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
 713                         break;
 714                 }
 715                 break;
 716         case MSG_DISCONNECT:
 717                 scb = aic->nexus;
 718                 ccb_h = &scb->ccb->ccb_h;
 719                 TAILQ_INSERT_TAIL(&aic->nexus_ccbs, ccb_h, sim_links.tqe);
 720                 scb->flags |= SCB_DISCONNECTED;
 721                 aic->flags |= AIC_BUSFREE_OK;
 722                 aic->nexus = NULL;
 723                 CAM_DEBUG(ccb_h->path, CAM_DEBUG_TRACE, ("disconnected\n"));
 724                 break;
 725         case MSG_MESSAGE_REJECT:
 726                 switch (aic->msg_outq & -aic->msg_outq) {
 727                 case AIC_MSG_TAG_Q:
 728                         scb = aic->nexus;
 729                         ti = &aic->tinfo[scb->target];
 730                         ti->flags &= ~TINFO_TAG_ENB;
 731                         ti->lubusy |= 1 << scb->lun;
 732                         break;
 733                 case AIC_MSG_SDTR:
 734                         scb = aic->nexus;
 735                         ti = &aic->tinfo[scb->target];
 736                         ti->current.period = ti->goal.period = 0;
 737                         ti->current.offset = ti->goal.offset = 0;
 738                         ti->flags &= ~(TINFO_SDTR_SENT|TINFO_SDTR_NEGO);
 739                         ti->scsirate = 0;
 740                         aic_outb(aic, SCSIRATE, ti->scsirate);
 741                         neg.sync_period = ti->current.period;
 742                         neg.sync_offset = ti->current.offset;
 743                         neg.valid = CCB_TRANS_SYNC_RATE_VALID
 744                                   | CCB_TRANS_SYNC_OFFSET_VALID;
 745                         ccb_h = &scb->ccb->ccb_h;
 746                         xpt_setup_ccb(&neg.ccb_h, ccb_h->path, 1);
 747                         xpt_async(AC_TRANSFER_NEG, ccb_h->path, &neg);
 748                         break;
 749                 default:
 750                         break;
 751                 }
 752                 break;
 753         case MSG_SAVEDATAPOINTER:
 754                 break;
 755         case MSG_RESTOREPOINTERS:
 756                 break;
 757         case MSG_NOOP:
 758                 break;
 759         default:
 760                 aic_sched_msgout(aic, MSG_MESSAGE_REJECT);
 761                 break;
 762         }
 763 }
 764
 765 /*
 766  * Send messages.
 767  */
 768 static void
 769 aic_msgout(struct aic_softc *aic)
 770 {
 771         struct aic_scb *scb;
 772         union ccb *ccb;
 773         struct aic_tinfo *ti;
 774         int msgidx = 0;
 775
 776         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_msgout\n"));
 777
 778         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
 779         aic_outb(aic, SXFRCTL0, CHEN|SPIOEN);
 780
 781         /*
 782          * If the previous phase is also the message out phase,
 783          * we need to retransmit all the messages, probably
 784          * because the target has detected a parity error during
 785          * the past transmission.
 786          */
 787         if (aic->prev_phase == PH_MSGOUT)
 788                 aic->msg_outq = aic->msg_sent;
 789
 790         do {
 791                 int q = aic->msg_outq;
 792                 if (msgidx > 0 && msgidx == aic->msg_len) {
 793                         /* complete message sent, start the next one */
 794                         q &= -q;
 795                         aic->msg_sent |= q;
 796                         aic->msg_outq ^= q;
 797                         q = aic->msg_outq;
 798                         msgidx = 0;
 799                 }
 800                 if (msgidx == 0) {
 801                         /* setup the message */
 802                         switch (q & -q) {
 803                         case AIC_MSG_IDENTIFY:
 804                                 scb = aic->nexus;
 805                                 ccb = scb->ccb;
 806                                 ti = &aic->tinfo[scb->target];
 807                                 aic->msg_buf[0] = MSG_IDENTIFY(scb->lun,
 808                                     (ti->flags & TINFO_DISC_ENB) &&
 809                                     !(ccb->ccb_h.flags & CAM_DIS_DISCONNECT));
 810                                 aic->msg_len = 1;
 811                                 break;
 812                         case AIC_MSG_TAG_Q:
 813                                 scb = aic->nexus;
 814                                 ccb = scb->ccb;
 815                                 aic->msg_buf[0] = ccb->csio.tag_action;
 816                                 aic->msg_buf[1] = scb->tag;
 817                                 aic->msg_len = 2;
 818                                 break;
 819                         case AIC_MSG_SDTR:
 820                                 scb = aic->nexus;
 821                                 ti = &aic->tinfo[scb->target];
 822                                 aic->msg_buf[0] = MSG_EXTENDED;
 823                                 aic->msg_buf[1] = MSG_EXT_SDTR_LEN;
 824                                 aic->msg_buf[2] = MSG_EXT_SDTR;
 825                                 aic->msg_buf[3] = ti->goal.period;
 826                                 aic->msg_buf[4] = ti->goal.offset;
 827                                 aic->msg_len = MSG_EXT_SDTR_LEN + 2;
 828                                 ti->flags |= TINFO_SDTR_SENT;
 829                                 break;
 830                         case AIC_MSG_MSGBUF:
 831                                 /* a single message already in the buffer */
 832                                 if (aic->msg_buf[0] == MSG_BUS_DEV_RESET ||
 833                                     aic->msg_buf[0] == MSG_ABORT ||
 834                                     aic->msg_buf[0] == MSG_ABORT_TAG)
 835                                         aic->flags |= AIC_BUSFREE_OK;
 836                                 break;
 837                         }
 838                 }
 839                 /*
 840                  * If this is the last message byte of all messages,
 841                  * clear ATNO to signal transmission complete.
 842                  */
 843                 if ((q & (q - 1)) == 0 && msgidx == aic->msg_len - 1)
 844                         aic_outb(aic, CLRSINT1, CLRATNO);
 845                 /* transmit the message byte */
 846                 aic_outb(aic, SCSIDAT, aic->msg_buf[msgidx++]);
 847         } while (aic_spiordy(aic));
 848
 849         aic_outb(aic, SXFRCTL0, CHEN);
 850         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 851 }
 852
 853 /*
 854  * Read data bytes.
 855  */
 856 static void
 857 aic_datain(struct aic_softc *aic)
 858 {
 859         struct aic_scb *scb = aic->nexus;
 860         u_int8_t dmastat, dmacntrl0;
 861         int n;
 862
 863         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_datain\n"));
 864
 865         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
 866         aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
 867
 868         dmacntrl0 = ENDMA;
 869         if (aic->flags & AIC_DWIO_ENABLE)
 870                 dmacntrl0 |= DWORDPIO;
 871         aic_outb(aic, DMACNTRL0, dmacntrl0);
 872
 873         while (scb->data_len > 0) {
 874                 for (;;) {
 875                         /* wait for the fifo to fill up or a phase change */
 876                         dmastat = aic_inb(aic, DMASTAT);
 877                         if (dmastat & (INTSTAT|DFIFOFULL))
 878                                 break;
 879                 }
 880                 if (dmastat & DFIFOFULL) {
 881                         n = FIFOSIZE;
 882                 } else {
 883                         /*
 884                          * No more data, wait for the remaining bytes in
 885                          * the scsi fifo to be transfer to the host fifo.
 886                          */
 887                         while (!(aic_inb(aic, SSTAT2) & SEMPTY))
 888                                 ;
 889                         n = aic_inb(aic, FIFOSTAT);
 890                 }
 891                 n = imin(scb->data_len, n);
 892                 if (aic->flags & AIC_DWIO_ENABLE) {
 893                         if (n >= 12) {
 894                                 aic_insl(aic, DMADATALONG, scb->data_ptr, n>>2);
 895                                 scb->data_ptr += n & ~3;
 896                                 scb->data_len -= n & ~3;
 897                                 n &= 3;
 898                         }
 899                 } else {
 900                         if (n >= 8) {
 901                                 aic_insw(aic, DMADATA, scb->data_ptr, n >> 1);
 902                                 scb->data_ptr += n & ~1;
 903                                 scb->data_len -= n & ~1;
 904                                 n &= 1;
 905                         }
 906                 }
 907                 if (n) {
 908                         aic_outb(aic, DMACNTRL0, ENDMA|B8MODE);
 909                         aic_insb(aic, DMADATA, scb->data_ptr, n);
 910                         scb->data_ptr += n;
 911                         scb->data_len -= n;
 912                         aic_outb(aic, DMACNTRL0, dmacntrl0);
 913                 }
 914
 915                 if (dmastat & INTSTAT)
 916                         break;
 917         }
 918
 919         aic_outb(aic, SXFRCTL0, CHEN);
 920         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 921 }
 922
 923 /*
 924  * Send data bytes.
 925  */
 926 static void
 927 aic_dataout(struct aic_softc *aic)
 928 {
 929         struct aic_scb *scb = aic->nexus;
 930         u_int8_t dmastat, dmacntrl0, sstat2;
 931         int n;
 932
 933         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_dataout\n"));
 934
 935         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
 936         aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
 937
 938         dmacntrl0 = ENDMA|WRITE;
 939         if (aic->flags & AIC_DWIO_ENABLE)
 940                 dmacntrl0 |= DWORDPIO;
 941         aic_outb(aic, DMACNTRL0, dmacntrl0);
 942
 943         while (scb->data_len > 0) {
 944                 for (;;) {
 945                         /* wait for the fifo to clear up or a phase change */
 946                         dmastat = aic_inb(aic, DMASTAT);
 947                         if (dmastat & (INTSTAT|DFIFOEMP))
 948                                 break;
 949                 }
 950                 if (dmastat & INTSTAT)
 951                         break;
 952                 n = imin(scb->data_len, FIFOSIZE);
 953                 if (aic->flags & AIC_DWIO_ENABLE) {
 954                         if (n >= 12) {
 955                                 aic_outsl(aic, DMADATALONG, scb->data_ptr,n>>2);
 956                                 scb->data_ptr += n & ~3;
 957                                 scb->data_len -= n & ~3;
 958                                 n &= 3;
 959                         }
 960                 } else {
 961                         if (n >= 8) {
 962                                 aic_outsw(aic, DMADATA, scb->data_ptr, n >> 1);
 963                                 scb->data_ptr += n & ~1;
 964                                 scb->data_len -= n & ~1;
 965                                 n &= 1;
 966                         }
 967                 }
 968                 if (n) {
 969                         aic_outb(aic, DMACNTRL0, ENDMA|WRITE|B8MODE);
 970                         aic_outsb(aic, DMADATA, scb->data_ptr, n);
 971                         scb->data_ptr += n;
 972                         scb->data_len -= n;
 973                         aic_outb(aic, DMACNTRL0, dmacntrl0);
 974                 }
 975         }
 976
 977         for (;;) {
 978                 /* wait until all bytes in the fifos are transmitted */
 979                 dmastat = aic_inb(aic, DMASTAT);
 980                 sstat2 = aic_inb(aic, SSTAT2);
 981                 if ((dmastat & DFIFOEMP) && (sstat2 & SEMPTY))
 982                         break;
 983                 if (dmastat & INTSTAT) {
 984                         /* adjust for untransmitted bytes */
 985                         n = aic_inb(aic, FIFOSTAT) + (sstat2 & 0xf);
 986                         scb->data_ptr -= n;
 987                         scb->data_len += n;
 988                         /* clear the fifo */
 989                         aic_outb(aic, SXFRCTL0, CHEN|CLRCH);
 990                         aic_outb(aic, DMACNTRL0, RSTFIFO);
 991                         break;
 992                 }
 993         }
 994
 995         aic_outb(aic, SXFRCTL0, CHEN);
 996         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
 997 }
 998
 999 /*
1000  * Send the scsi command.
1001  */
1002 static void
1003 aic_cmd(struct aic_softc *aic)
1004 {
1005         struct aic_scb *scb = aic->nexus;
1006         struct scsi_request_sense sense_cmd;
1007
1008         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_cmd\n"));
1009
1010         if (scb->flags & SCB_SENSE) {
1011                 /* autosense request */
1012                 sense_cmd.opcode = REQUEST_SENSE;
1013                 sense_cmd.byte2 = scb->lun << 5;
1014                 sense_cmd.length = scb->ccb->csio.sense_len;
1015                 sense_cmd.control = 0;
1016                 sense_cmd.unused[0] = 0;
1017                 sense_cmd.unused[1] = 0;
1018                 scb->cmd_ptr = (u_int8_t *)&sense_cmd;
1019                 scb->cmd_len = sizeof(sense_cmd);
1020                 scb->data_ptr = (u_int8_t *)&scb->ccb->csio.sense_data;
1021                 scb->data_len = scb->ccb->csio.sense_len;
1022         }
1023
1024         aic_outb(aic, SIMODE1, ENSCSIRST|ENPHASEMIS|ENBUSFREE);
1025         aic_outb(aic, DMACNTRL0, ENDMA|WRITE);
1026         aic_outb(aic, SXFRCTL0, SCSIEN|DMAEN|CHEN);
1027         aic_outsw(aic, DMADATA, (u_int16_t *)scb->cmd_ptr, scb->cmd_len >> 1);
1028         while ((aic_inb(aic, SSTAT2) & SEMPTY) == 0 &&
1029             (aic_inb(aic, DMASTAT) & INTSTAT) == 0)
1030                 ;
1031         aic_outb(aic, SXFRCTL0, CHEN);
1032         aic_outb(aic, SIMODE1, ENSCSIRST|ENBUSFREE|ENREQINIT);
1033 }
1034
1035 /*
1036  * Finish off a command. The caller is responsible to remove the ccb
1037  * from any queue.
1038  */
1039 static void
1040 aic_done(struct aic_softc *aic, struct aic_scb *scb)
1041 {
1042         union ccb *ccb = scb->ccb;
1043
1044         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
1045                   ("aic_done - ccb %p status %x resid %d\n",
1046                    ccb, ccb->ccb_h.status, ccb->csio.resid));
1047
1048         callout_stop(&ccb->ccb_h.timeout_ch);
1049
1050         if ((scb->flags & SCB_DEVICE_RESET) != 0 &&
1051             ccb->ccb_h.func_code != XPT_RESET_DEV) {
1052                 struct cam_path *path;
1053                 struct ccb_hdr *ccb_h;
1054                 cam_status error;
1055
1056                 error = xpt_create_path(&path, /*periph*/NULL,
1057                                         cam_sim_path(aic->sim),
1058                                         scb->target,
1059                                         CAM_LUN_WILDCARD);
1060
1061                 if (error == CAM_REQ_CMP) {
1062                         xpt_async(AC_SENT_BDR, path, NULL);
1063                         xpt_free_path(path);
1064                 }
1065
1066                 ccb_h = TAILQ_FIRST(&aic->pending_ccbs);
1067                 while (ccb_h != NULL) {
1068                         struct aic_scb *pending_scb;
1069
1070                         pending_scb = (struct aic_scb *)ccb_h->ccb_scb_ptr;
1071                         if (ccb_h->target_id == scb->target) {
1072                                 ccb_h->status |= CAM_BDR_SENT;
1073                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
1074                                 TAILQ_REMOVE(&aic->pending_ccbs,
1075                                     &pending_scb->ccb->ccb_h, sim_links.tqe);
1076                                 aic_done(aic, pending_scb);
1077                         } else {
1078                                 callout_reset(&ccb_h->timeout_ch,
1079                                     (ccb_h->timeout * hz) / 1000,
1080                                     aic_timeout, pending_scb);
1081                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
1082                         }
1083                 }
1084
1085                 ccb_h = TAILQ_FIRST(&aic->nexus_ccbs);
1086                 while (ccb_h != NULL) {
1087                         struct aic_scb *nexus_scb;
1088
1089                         nexus_scb = (struct aic_scb *)ccb_h->ccb_scb_ptr;
1090                         if (ccb_h->target_id == scb->target) {
1091                                 ccb_h->status |= CAM_BDR_SENT;
1092                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
1093                                 TAILQ_REMOVE(&aic->nexus_ccbs,
1094                                     &nexus_scb->ccb->ccb_h, sim_links.tqe);
1095                                 aic_done(aic, nexus_scb);
1096                         } else {
1097                                 callout_reset(&ccb_h->timeout_ch,
1098                                     (ccb_h->timeout * hz) / 1000,
1099                                     aic_timeout, nexus_scb);
1100                                 ccb_h = TAILQ_NEXT(ccb_h, sim_links.tqe);
1101                         }
1102                 }
1103         }
1104
1105         if (aic->nexus == scb || scb->flags & SCB_DISCONNECTED)
1106                 aic->tinfo[scb->target].lubusy &= ~(1 << scb->lun);
1107
1108         if (aic->nexus == scb) {
1109                 aic->nexus = NULL;
1110         }
1111         aic_free_scb(aic, scb);
1112         xpt_done(ccb);
1113 }
1114
1115 static void
1116 aic_poll(struct cam_sim *sim)
1117 {
1118         aic_intr(cam_sim_softc(sim));
1119 }
1120
1121 static void
1122 aic_timeout(void *arg)
1123 {
1124         struct aic_scb *scb = (struct aic_scb *)arg;
1125         union ccb *ccb = scb->ccb;
1126         struct aic_softc *aic = (struct aic_softc *)ccb->ccb_h.ccb_aic_ptr;
1127
1128         xpt_print_path(ccb->ccb_h.path);
1129         printf("ccb %p - timed out", ccb);
1130         if (aic->nexus && aic->nexus != scb)
1131                 printf(", nexus %p", aic->nexus->ccb);
1132         printf(", phase 0x%x, state %d\n", aic_inb(aic, SCSISIGI), aic->state);
1133
1134         crit_enter();
1135
1136         if ((scb->flags & SCB_ACTIVE) == 0) {
1137                 crit_exit();
1138                 xpt_print_path(ccb->ccb_h.path);
1139                 printf("ccb %p - timed out already completed\n", ccb);
1140                 return;
1141         }
1142
1143         if ((scb->flags & SCB_DEVICE_RESET) == 0 && aic->nexus == scb) {
1144                 struct ccb_hdr *ccb_h = &scb->ccb->ccb_h;
1145
1146                 if ((ccb_h->status & CAM_RELEASE_SIMQ) == 0) {
1147                         xpt_freeze_simq(aic->sim, /*count*/1);
1148                         ccb_h->status |= CAM_RELEASE_SIMQ;
1149                 }
1150
1151                 TAILQ_FOREACH(ccb_h, &aic->pending_ccbs, sim_links.tqe)
1152                         callout_stop(&ccb_h->timeout_ch);
1153
1154                 TAILQ_FOREACH(ccb_h, &aic->nexus_ccbs, sim_links.tqe)
1155                         callout_stop(&ccb_h->timeout_ch);
1156
1157                 scb->flags |= SCB_DEVICE_RESET;
1158                 callout_reset(&ccb->ccb_h.timeout_ch, 5 * hz, aic_timeout, scb);
1159                 aic_sched_msgout(aic, MSG_BUS_DEV_RESET);
1160         } else {
1161                 if (aic->nexus == scb) {
1162                         ccb->ccb_h.status |= CAM_CMD_TIMEOUT;
1163                         aic_done(aic, scb);
1164                 }
1165                 aic_reset(aic, /*initiate_reset*/TRUE);
1166         }
1167
1168         crit_exit();
1169 }
1170
1171 void
1172 aic_intr(void *arg)
1173 {
1174         struct aic_softc *aic = (struct aic_softc *)arg;
1175         u_int8_t sstat0, sstat1;
1176         union ccb *ccb;
1177         struct aic_scb *scb;
1178
1179         if (!(aic_inb(aic, DMASTAT) & INTSTAT))
1180                 return;
1181
1182         aic_outb(aic, DMACNTRL0, 0);
1183
1184         sstat0 = aic_inb(aic, SSTAT0);
1185         sstat1 = aic_inb(aic, SSTAT1);
1186
1187         if ((sstat1 & SCSIRSTI) != 0) {
1188                 /* a device-initiated bus reset */
1189                 aic_outb(aic, CLRSINT1, CLRSCSIRSTI);
1190                 aic_reset(aic, /*initiate_reset*/FALSE);
1191                 return;
1192         }
1193
1194         if ((sstat1 & SCSIPERR) != 0) {
1195                 aic_outb(aic, CLRSINT1, CLRSCSIPERR);
1196                 aic_sched_msgout(aic, MSG_PARITY_ERROR);
1197                 aic_outb(aic, DMACNTRL0, INTEN);
1198                 return;
1199         }
1200
1201         if (aic_inb(aic, SSTAT4)) {
1202                 aic_outb(aic, CLRSERR, CLRSYNCERR|CLRFWERR|CLRFRERR);
1203                 aic_reset(aic, /*initiate_reset*/TRUE);
1204                 return;
1205         }
1206
1207         if (aic->state <= AIC_SELECTING) {
1208                 if ((sstat0 & SELDI) != 0) {
1209                         aic_reselected(aic);
1210                         aic_outb(aic, DMACNTRL0, INTEN);
1211                         return;
1212                 }
1213
1214                 if ((sstat0 & SELDO) != 0) {
1215                         aic_selected(aic);
1216                         aic_outb(aic, DMACNTRL0, INTEN);
1217                         return;
1218                 }
1219
1220                 if ((sstat1 & SELTO) != 0) {
1221                         scb = aic->nexus;
1222                         ccb = scb->ccb;
1223                         ccb->ccb_h.status = CAM_SEL_TIMEOUT;
1224                         aic_done(aic, scb);
1225                         while ((sstat1 & BUSFREE) == 0)
1226                                 sstat1 = aic_inb(aic, SSTAT1);
1227                         aic->flags |= AIC_BUSFREE_OK;
1228                 }
1229         }
1230
1231         if ((sstat1 & BUSFREE) != 0) {
1232                 aic_outb(aic, SCSISEQ, 0);
1233                 aic_outb(aic, CLRSINT0, sstat0);
1234                 aic_outb(aic, CLRSINT1, sstat1);
1235                 if ((scb = aic->nexus)) {
1236                         if ((aic->flags & AIC_BUSFREE_OK) == 0) {
1237                                 ccb = scb->ccb;
1238                                 ccb->ccb_h.status = CAM_UNEXP_BUSFREE;
1239                                 aic_done(aic, scb);
1240                         } else if (scb->flags & SCB_DEVICE_RESET) {
1241                                 ccb = scb->ccb;
1242                                 if (ccb->ccb_h.func_code == XPT_RESET_DEV) {
1243                                         xpt_async(AC_SENT_BDR,
1244                                             ccb->ccb_h.path, NULL);
1245                                         ccb->ccb_h.status |= CAM_REQ_CMP;
1246                                 } else
1247                                         ccb->ccb_h.status |= CAM_CMD_TIMEOUT;
1248                                 aic_done(aic, scb);
1249                         } else if (scb->flags & SCB_SENSE) {
1250                                 /* autosense request */
1251                                 aic->flags &= ~AIC_BUSFREE_OK;
1252                                 aic->tinfo[scb->target].lubusy &=
1253                                     ~(1 << scb->lun);
1254                                 aic_select(aic);
1255                                 aic_outb(aic, DMACNTRL0, INTEN);
1256                                 return;
1257                         }
1258                 }
1259                 aic->flags &= ~AIC_BUSFREE_OK;
1260                 aic->state = AIC_IDLE;
1261                 aic_start(aic);
1262                 aic_outb(aic, DMACNTRL0, INTEN);
1263                 return;
1264         }
1265
1266         if ((sstat1 & REQINIT) != 0) {
1267                 u_int8_t phase = aic_inb(aic, SCSISIGI) & PH_MASK;
1268                 aic_outb(aic, SCSISIGO, phase);
1269                 aic_outb(aic, CLRSINT1, CLRPHASECHG);
1270
1271                 switch (phase) {
1272                 case PH_MSGOUT:
1273                         aic_msgout(aic);
1274                         break;
1275                 case PH_MSGIN:
1276                         aic_msgin(aic);
1277                         break;
1278                 case PH_STAT:
1279                         scb = aic->nexus;
1280                         ccb = scb->ccb;
1281                         aic_outb(aic, DMACNTRL0, 0);
1282                         aic_outb(aic, SXFRCTL0, CHEN|SPIOEN);
1283                         scb->status = aic_inb(aic, SCSIDAT);
1284                         aic_outb(aic, SXFRCTL0, CHEN);
1285                         break;
1286                 case PH_CMD:
1287                         aic_cmd(aic);
1288                         break;
1289                 case PH_DATAIN:
1290                         aic_datain(aic);
1291                         break;
1292                 case PH_DATAOUT:
1293                         aic_dataout(aic);
1294                         break;
1295                 }
1296                 aic->prev_phase = phase;
1297                 aic_outb(aic, DMACNTRL0, INTEN);
1298                 return;
1299         }
1300
1301         printf("aic_intr: unexpected intr sstat0 %x sstat1 %x\n",
1302                 sstat0, sstat1);
1303         aic_outb(aic, DMACNTRL0, INTEN);
1304 }
1305
1306 /*
1307  * Reset ourselves.
1308  */
1309 static void
1310 aic_chip_reset(struct aic_softc *aic)
1311 {
1312         /*
1313          * Doc. recommends to clear these two registers before
1314          * operations commence
1315          */
1316         aic_outb(aic, SCSITEST, 0);
1317         aic_outb(aic, TEST, 0);
1318
1319         /* Reset SCSI-FIFO and abort any transfers */
1320         aic_outb(aic, SXFRCTL0, CHEN|CLRCH|CLRSTCNT);
1321
1322         /* Reset HOST-FIFO */
1323         aic_outb(aic, DMACNTRL0, RSTFIFO);
1324         aic_outb(aic, DMACNTRL1, 0);
1325
1326         /* Disable all selection features */
1327         aic_outb(aic, SCSISEQ, 0);
1328         aic_outb(aic, SXFRCTL1, 0);
1329
1330         /* Disable interrupts */
1331         aic_outb(aic, SIMODE0, 0);
1332         aic_outb(aic, SIMODE1, 0);
1333
1334         /* Clear interrupts */
1335         aic_outb(aic, CLRSINT0, 0x7f);
1336         aic_outb(aic, CLRSINT1, 0xef);
1337
1338         /* Disable synchronous transfers */
1339         aic_outb(aic, SCSIRATE, 0);
1340
1341         /* Haven't seen ant errors (yet) */
1342         aic_outb(aic, CLRSERR, 0x07);
1343
1344         /* Set our SCSI-ID */
1345         aic_outb(aic, SCSIID, aic->initiator << OID_S);
1346         aic_outb(aic, BRSTCNTRL, EISA_BRST_TIM);
1347 }
1348
1349 /*
1350  * Reset the SCSI bus
1351  */
1352 static void
1353 aic_scsi_reset(struct aic_softc *aic)
1354 {
1355         aic_outb(aic, SCSISEQ, SCSIRSTO);
1356         DELAY(500);
1357         aic_outb(aic, SCSISEQ, 0);
1358         DELAY(50);
1359 }
1360
1361 /*
1362  * Reset. Abort all pending commands.
1363  */
1364 static void
1365 aic_reset(struct aic_softc *aic, int initiate_reset)
1366 {
1367         struct ccb_hdr *ccb_h;
1368
1369         CAM_DEBUG_PRINT(CAM_DEBUG_TRACE, ("aic_reset\n"));
1370
1371         if (initiate_reset)
1372                 aic_scsi_reset(aic);
1373         aic_chip_reset(aic);
1374
1375         xpt_async(AC_BUS_RESET, aic->path, NULL);
1376
1377         while ((ccb_h = TAILQ_FIRST(&aic->pending_ccbs)) != NULL) {
1378                 TAILQ_REMOVE(&aic->pending_ccbs, ccb_h, sim_links.tqe);
1379                 ccb_h->status |= CAM_SCSI_BUS_RESET;
1380                 aic_done(aic, (struct aic_scb *)ccb_h->ccb_scb_ptr);
1381         }
1382
1383         while ((ccb_h = TAILQ_FIRST(&aic->nexus_ccbs)) != NULL) {
1384                 TAILQ_REMOVE(&aic->nexus_ccbs, ccb_h, sim_links.tqe);
1385                 ccb_h->status |= CAM_SCSI_BUS_RESET;
1386                 aic_done(aic, (struct aic_scb *)ccb_h->ccb_scb_ptr);
1387         }
1388
1389         if (aic->nexus) {
1390                 ccb_h = &aic->nexus->ccb->ccb_h;
1391                 ccb_h->status |= CAM_SCSI_BUS_RESET;
1392                 aic_done(aic, aic->nexus);
1393         }
1394
1395         aic->state = AIC_IDLE;
1396         aic_outb(aic, DMACNTRL0, INTEN);
1397 }
1398
1399 static void
1400 aic_init(struct aic_softc *aic)
1401 {
1402         struct aic_scb *scb;
1403         struct aic_tinfo *ti;
1404         u_int8_t porta, portb;
1405         int i;
1406
1407         TAILQ_INIT(&aic->pending_ccbs);
1408         TAILQ_INIT(&aic->nexus_ccbs);
1409         aic->nexus = NULL;
1410         aic->state = AIC_IDLE;
1411         aic->prev_phase = -1;
1412         aic->flags = 0;
1413
1414         aic_chip_reset(aic);
1415         aic_scsi_reset(aic);
1416
1417         porta = aic_inb(aic, PORTA);
1418         portb = aic_inb(aic, PORTB);
1419
1420         aic->initiator = PORTA_ID(porta);
1421         if (PORTA_PARITY(porta))
1422                 aic->flags |= AIC_PARITY_ENABLE;
1423         if (PORTB_DISC(portb))
1424                 aic->flags |= AIC_DISC_ENABLE;
1425         if (PORTB_DMA(portb))
1426                 aic->flags |= AIC_DMA_ENABLE;
1427         if (aic_inb(aic, REV))
1428                 aic->flags |= AIC_DWIO_ENABLE;
1429
1430         free_scbs = NULL;
1431         for (i = 255; i >= 0; i--) {
1432                 scb = &aic->scbs[i];
1433                 scb->tag = i;
1434                 aic_free_scb(aic, scb);
1435         }
1436
1437         for (i = 0; i < 8; i++) {
1438                 if (i == aic->initiator)
1439                         continue;
1440                 ti = &aic->tinfo[i];
1441                 bzero(ti, sizeof(*ti));
1442                 ti->flags = TINFO_TAG_ENB;
1443                 if (aic->flags & AIC_DISC_ENABLE)
1444                         ti->flags |= TINFO_DISC_ENB;
1445                 ti->user.period = AIC_SYNC_PERIOD;
1446                 ti->user.offset = AIC_SYNC_OFFSET;
1447                 ti->scsirate = 0;
1448         }
1449
1450         aic_outb(aic, DMACNTRL0, INTEN);
1451 }
1452
1453 int
1454 aic_probe(struct aic_softc *aic)
1455 {
1456         int i;
1457
1458         /* Remove aic6360 from possible powerdown mode */
1459         aic_outb(aic, DMACNTRL0, 0);
1460
1461 #define STSIZE  16
1462         aic_outb(aic, DMACNTRL1, 0);    /* Reset stack pointer */
1463         for (i = 0; i < STSIZE; i++)
1464                 aic_outb(aic, STACK, i);
1465
1466         /* See if we can pull out the same sequence */
1467         aic_outb(aic, DMACNTRL1, 0);
1468         for (i = 0; i < STSIZE && aic_inb(aic, STACK) == i; i++)
1469                 ;
1470         if (i != STSIZE)
1471                 return (ENXIO);
1472 #undef  STSIZE
1473         return (0);
1474 }
1475
1476 int
1477 aic_attach(struct aic_softc *aic)
1478 {
1479         /*
1480          * Construct our SIM entry
1481          */
1482         aic->sim = cam_sim_alloc(aic_action, aic_poll, "aic", aic,
1483                                  aic->unit, 2, 256, NULL);
1484         if (aic->sim == NULL)
1485                 return (ENOMEM);
1486
1487         if (xpt_bus_register(aic->sim, 0) != CAM_SUCCESS) {
1488                 cam_sim_free(aic->sim);
1489                 return (ENXIO);
1490         }
1491
1492         if (xpt_create_path(&aic->path, /*periph*/NULL,
1493                             cam_sim_path(aic->sim), CAM_TARGET_WILDCARD,
1494                             CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
1495                 xpt_bus_deregister(cam_sim_path(aic->sim));
1496                 cam_sim_free(aic->sim);
1497                 return (ENXIO);
1498         }
1499
1500         aic_init(aic);
1501
1502         printf("aic%d: %s", aic->unit,
1503             aic_inb(aic, REV) > 0 ? "aic6360" : "aic6260");
1504         if (aic->flags & AIC_DMA_ENABLE)
1505                 printf(", dma");
1506         if (aic->flags & AIC_DISC_ENABLE)
1507                 printf(", disconnection");
1508         if (aic->flags & AIC_PARITY_ENABLE)
1509                 printf(", parity check");
1510         printf("\n");
1511         return (0);
1512 }
1513
1514 int
1515 aic_detach(struct aic_softc *aic)
1516 {
1517         xpt_async(AC_LOST_DEVICE, aic->path, NULL);
1518         xpt_free_path(aic->path);
1519         xpt_bus_deregister(cam_sim_path(aic->sim));
1520         cam_sim_free(aic->sim);
1521         return (0);
1522 }