drivers/scsi/sym53c8xx_2/sym_glue.c

   1 /*
   2  * Device driver for the SYMBIOS/LSILOGIC 53C8XX and 53C1010 family
   3  * of PCI-SCSI IO processors.
   4  *
   5  * Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>
   6  * Copyright (c) 2003-2005  Matthew Wilcox <matthew@wil.cx>
   7  *
   8  * This driver is derived from the Linux sym53c8xx driver.
   9  * Copyright (C) 1998-2000  Gerard Roudier
  10  *
  11  * The sym53c8xx driver is derived from the ncr53c8xx driver that had been
  12  * a port of the FreeBSD ncr driver to Linux-1.2.13.
  13  *
  14  * The original ncr driver has been written for 386bsd and FreeBSD by
  15  *         Wolfgang Stanglmeier        <wolf@cologne.de>
  16  *         Stefan Esser                <se@mi.Uni-Koeln.de>
  17  * Copyright (C) 1994  Wolfgang Stanglmeier
  18  *
  19  * Other major contributions:
  20  *
  21  * NVRAM detection and reading.
  22  * Copyright (C) 1997 Richard Waltham <dormouse@farsrobt.demon.co.uk>
  23  *
  24  *-----------------------------------------------------------------------------
  25  *
  26  * This program is free software; you can redistribute it and/or modify
  27  * it under the terms of the GNU General Public License as published by
  28  * the Free Software Foundation; either version 2 of the License, or
  29  * (at your option) any later version.
  30  *
  31  * This program is distributed in the hope that it will be useful,
  32  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  33  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  34  * GNU General Public License for more details.
  35  *
  36  * You should have received a copy of the GNU General Public License
  37  * along with this program; if not, write to the Free Software
  38  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  39  */
  40 #include <linux/ctype.h>
  41 #include <linux/init.h>
  42 #include <linux/module.h>
  43 #include <linux/moduleparam.h>
  44 #include <linux/spinlock.h>
  45 #include <scsi/scsi.h>
  46 #include <scsi/scsi_tcq.h>
  47 #include <scsi/scsi_device.h>
  48 #include <scsi/scsi_transport.h>
  49
  50 #include "sym_glue.h"
  51 #include "sym_nvram.h"
  52
  53 #define NAME53C         "sym53c"
  54 #define NAME53C8XX      "sym53c8xx"
  55
  56 struct sym_driver_setup sym_driver_setup = SYM_LINUX_DRIVER_SETUP;
  57 unsigned int sym_debug_flags = 0;
  58
  59 static char *excl_string;
  60 static char *safe_string;
  61 module_param_named(cmd_per_lun, sym_driver_setup.max_tag, ushort, 0);
  62 module_param_named(burst, sym_driver_setup.burst_order, byte, 0);
  63 module_param_named(led, sym_driver_setup.scsi_led, byte, 0);
  64 module_param_named(diff, sym_driver_setup.scsi_diff, byte, 0);
  65 module_param_named(irqm, sym_driver_setup.irq_mode, byte, 0);
  66 module_param_named(buschk, sym_driver_setup.scsi_bus_check, byte, 0);
  67 module_param_named(hostid, sym_driver_setup.host_id, byte, 0);
  68 module_param_named(verb, sym_driver_setup.verbose, byte, 0);
  69 module_param_named(debug, sym_debug_flags, uint, 0);
  70 module_param_named(settle, sym_driver_setup.settle_delay, byte, 0);
  71 module_param_named(nvram, sym_driver_setup.use_nvram, byte, 0);
  72 module_param_named(excl, excl_string, charp, 0);
  73 module_param_named(safe, safe_string, charp, 0);
  74
  75 MODULE_PARM_DESC(cmd_per_lun, "The maximum number of tags to use by default");
  76 MODULE_PARM_DESC(burst, "Maximum burst.  0 to disable, 255 to read from registers");
  77 MODULE_PARM_DESC(led, "Set to 1 to enable LED support");
  78 MODULE_PARM_DESC(diff, "0 for no differential mode, 1 for BIOS, 2 for always, 3 for not GPIO3");
  79 MODULE_PARM_DESC(irqm, "0 for open drain, 1 to leave alone, 2 for totem pole");
  80 MODULE_PARM_DESC(buschk, "0 to not check, 1 for detach on error, 2 for warn on error");
  81 MODULE_PARM_DESC(hostid, "The SCSI ID to use for the host adapters");
  82 MODULE_PARM_DESC(verb, "0 for minimal verbosity, 1 for normal, 2 for excessive");
  83 MODULE_PARM_DESC(debug, "Set bits to enable debugging");
  84 MODULE_PARM_DESC(settle, "Settle delay in seconds.  Default 3");
  85 MODULE_PARM_DESC(nvram, "Option currently not used");
  86 MODULE_PARM_DESC(excl, "List ioport addresses here to prevent controllers from being attached");
  87 MODULE_PARM_DESC(safe, "Set other settings to a \"safe mode\"");
  88
  89 MODULE_LICENSE("GPL");
  90 MODULE_VERSION(SYM_VERSION);
  91 MODULE_AUTHOR("Matthew Wilcox <matthew@wil.cx>");
  92 MODULE_DESCRIPTION("NCR, Symbios and LSI 8xx and 1010 PCI SCSI adapters");
  93
  94 static void sym2_setup_params(void)
  95 {
  96         char *p = excl_string;
  97         int xi = 0;
  98
  99         while (p && (xi < 8)) {
 100                 char *next_p;
 101                 int val = (int) simple_strtoul(p, &next_p, 0);
 102                 sym_driver_setup.excludes[xi++] = val;
 103                 p = next_p;
 104         }
 105
 106         if (safe_string) {
 107                 if (*safe_string == 'y') {
 108                         sym_driver_setup.max_tag = 0;
 109                         sym_driver_setup.burst_order = 0;
 110                         sym_driver_setup.scsi_led = 0;
 111                         sym_driver_setup.scsi_diff = 1;
 112                         sym_driver_setup.irq_mode = 0;
 113                         sym_driver_setup.scsi_bus_check = 2;
 114                         sym_driver_setup.host_id = 7;
 115                         sym_driver_setup.verbose = 2;
 116                         sym_driver_setup.settle_delay = 10;
 117                         sym_driver_setup.use_nvram = 1;
 118                 } else if (*safe_string != 'n') {
 119                         printk(KERN_WARNING NAME53C8XX "Ignoring parameter %s"
 120                                         " passed to safe option", safe_string);
 121                 }
 122         }
 123 }
 124
 125 static struct scsi_transport_template *sym2_transport_template = NULL;
 126
 127 /*
 128  *  Driver private area in the SCSI command structure.
 129  */
 130 struct sym_ucmd {               /* Override the SCSI pointer structure */
 131         struct completion *eh_done;             /* SCSI error handling */
 132 };
 133
 134 #define SYM_UCMD_PTR(cmd)  ((struct sym_ucmd *)(&(cmd)->SCp))
 135 #define SYM_SOFTC_PTR(cmd) sym_get_hcb(cmd->device->host)
 136
 137 /*
 138  *  Complete a pending CAM CCB.
 139  */
 140 void sym_xpt_done(struct sym_hcb *np, struct scsi_cmnd *cmd)
 141 {
 142         struct sym_ucmd *ucmd = SYM_UCMD_PTR(cmd);
 143         BUILD_BUG_ON(sizeof(struct scsi_pointer) < sizeof(struct sym_ucmd));
 144
 145         if (ucmd->eh_done)
 146                 complete(ucmd->eh_done);
 147
 148         scsi_dma_unmap(cmd);
 149         cmd->scsi_done(cmd);
 150 }
 151
 152 /*
 153  *  Tell the SCSI layer about a BUS RESET.
 154  */
 155 void sym_xpt_async_bus_reset(struct sym_hcb *np)
 156 {
 157         printf_notice("%s: SCSI BUS has been reset.\n", sym_name(np));
 158         np->s.settle_time = jiffies + sym_driver_setup.settle_delay * HZ;
 159         np->s.settle_time_valid = 1;
 160         if (sym_verbose >= 2)
 161                 printf_info("%s: command processing suspended for %d seconds\n",
 162                             sym_name(np), sym_driver_setup.settle_delay);
 163 }
 164
 165 /*
 166  *  Choose the more appropriate CAM status if
 167  *  the IO encountered an extended error.
 168  */
 169 static int sym_xerr_cam_status(int cam_status, int x_status)
 170 {
 171         if (x_status) {
 172                 if      (x_status & XE_PARITY_ERR)
 173                         cam_status = DID_PARITY;
 174                 else if (x_status &(XE_EXTRA_DATA|XE_SODL_UNRUN|XE_SWIDE_OVRUN))
 175                         cam_status = DID_ERROR;
 176                 else if (x_status & XE_BAD_PHASE)
 177                         cam_status = DID_ERROR;
 178                 else
 179                         cam_status = DID_ERROR;
 180         }
 181         return cam_status;
 182 }
 183
 184 /*
 185  *  Build CAM result for a failed or auto-sensed IO.
 186  */
 187 void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
 188 {
 189         struct scsi_cmnd *cmd = cp->cmd;
 190         u_int cam_status, scsi_status, drv_status;
 191
 192         drv_status  = 0;
 193         cam_status  = DID_OK;
 194         scsi_status = cp->ssss_status;
 195
 196         if (cp->host_flags & HF_SENSE) {
 197                 scsi_status = cp->sv_scsi_status;
 198                 resid = cp->sv_resid;
 199                 if (sym_verbose && cp->sv_xerr_status)
 200                         sym_print_xerr(cmd, cp->sv_xerr_status);
 201                 if (cp->host_status == HS_COMPLETE &&
 202                     cp->ssss_status == S_GOOD &&
 203                     cp->xerr_status == 0) {
 204                         cam_status = sym_xerr_cam_status(DID_OK,
 205                                                          cp->sv_xerr_status);
 206                         drv_status = DRIVER_SENSE;
 207                         /*
 208                          *  Bounce back the sense data to user.
 209                          */
 210                         memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
 211                         memcpy(cmd->sense_buffer, cp->sns_bbuf,
 212                                min(SCSI_SENSE_BUFFERSIZE, SYM_SNS_BBUF_LEN));
 213 #if 0
 214                         /*
 215                          *  If the device reports a UNIT ATTENTION condition
 216                          *  due to a RESET condition, we should consider all
 217                          *  disconnect CCBs for this unit as aborted.
 218                          */
 219                         if (1) {
 220                                 u_char *p;
 221                                 p  = (u_char *) cmd->sense_data;
 222                                 if (p[0]==0x70 && p[2]==0x6 && p[12]==0x29)
 223                                         sym_clear_tasks(np, DID_ABORT,
 224                                                         cp->target,cp->lun, -1);
 225                         }
 226 #endif
 227                 } else {
 228                         /*
 229                          * Error return from our internal request sense.  This
 230                          * is bad: we must clear the contingent allegiance
 231                          * condition otherwise the device will always return
 232                          * BUSY.  Use a big stick.
 233                          */
 234                         sym_reset_scsi_target(np, cmd->device->id);
 235                         cam_status = DID_ERROR;
 236                 }
 237         } else if (cp->host_status == HS_COMPLETE)      /* Bad SCSI status */
 238                 cam_status = DID_OK;
 239         else if (cp->host_status == HS_SEL_TIMEOUT)     /* Selection timeout */
 240                 cam_status = DID_NO_CONNECT;
 241         else if (cp->host_status == HS_UNEXPECTED)      /* Unexpected BUS FREE*/
 242                 cam_status = DID_ERROR;
 243         else {                                          /* Extended error */
 244                 if (sym_verbose) {
 245                         sym_print_addr(cmd, "COMMAND FAILED (%x %x %x).\n",
 246                                 cp->host_status, cp->ssss_status,
 247                                 cp->xerr_status);
 248                 }
 249                 /*
 250                  *  Set the most appropriate value for CAM status.
 251                  */
 252                 cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
 253         }
 254         scsi_set_resid(cmd, resid);
 255         cmd->result = (drv_status << 24) + (cam_status << 16) + scsi_status;
 256 }
 257
 258 static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
 259 {
 260         int segment;
 261         int use_sg;
 262
 263         cp->data_len = 0;
 264
 265         use_sg = scsi_dma_map(cmd);
 266         if (use_sg > 0) {
 267                 struct scatterlist *sg;
 268                 struct sym_tcb *tp = &np->target[cp->target];
 269                 struct sym_tblmove *data;
 270
 271                 if (use_sg > SYM_CONF_MAX_SG) {
 272                         scsi_dma_unmap(cmd);
 273                         return -1;
 274                 }
 275
 276                 data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];
 277
 278                 scsi_for_each_sg(cmd, sg, use_sg, segment) {
 279                         dma_addr_t baddr = sg_dma_address(sg);
 280                         unsigned int len = sg_dma_len(sg);
 281
 282                         if ((len & 1) && (tp->head.wval & EWS)) {
 283                                 len++;
 284                                 cp->odd_byte_adjustment++;
 285                         }
 286
 287                         sym_build_sge(np, &data[segment], baddr, len);
 288                         cp->data_len += len;
 289                 }
 290         } else {
 291                 segment = -2;
 292         }
 293
 294         return segment;
 295 }
 296
 297 /*
 298  *  Queue a SCSI command.
 299  */
 300 static int sym_queue_command(struct sym_hcb *np, struct scsi_cmnd *cmd)
 301 {
 302         struct scsi_device *sdev = cmd->device;
 303         struct sym_tcb *tp;
 304         struct sym_lcb *lp;
 305         struct sym_ccb *cp;
 306         int     order;
 307
 308         /*
 309          *  Retrieve the target descriptor.
 310          */
 311         tp = &np->target[sdev->id];
 312
 313         /*
 314          *  Select tagged/untagged.
 315          */
 316         lp = sym_lp(tp, sdev->lun);
 317         order = (lp && lp->s.reqtags) ? M_SIMPLE_TAG : 0;
 318
 319         /*
 320          *  Queue the SCSI IO.
 321          */
 322         cp = sym_get_ccb(np, cmd, order);
 323         if (!cp)
 324                 return 1;       /* Means resource shortage */
 325         sym_queue_scsiio(np, cmd, cp);
 326         return 0;
 327 }
 328
 329 /*
 330  *  Setup buffers and pointers that address the CDB.
 331  */
 332 static inline int sym_setup_cdb(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
 333 {
 334         memcpy(cp->cdb_buf, cmd->cmnd, cmd->cmd_len);
 335
 336         cp->phys.cmd.addr = CCB_BA(cp, cdb_buf[0]);
 337         cp->phys.cmd.size = cpu_to_scr(cmd->cmd_len);
 338
 339         return 0;
 340 }
 341
 342 /*
 343  *  Setup pointers that address the data and start the I/O.
 344  */
 345 int sym_setup_data_and_start(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
 346 {
 347         u32 lastp, goalp;
 348         int dir;
 349
 350         /*
 351          *  Build the CDB.
 352          */
 353         if (sym_setup_cdb(np, cmd, cp))
 354                 goto out_abort;
 355
 356         /*
 357          *  No direction means no data.
 358          */
 359         dir = cmd->sc_data_direction;
 360         if (dir != DMA_NONE) {
 361                 cp->segments = sym_scatter(np, cp, cmd);
 362                 if (cp->segments < 0) {
 363                         sym_set_cam_status(cmd, DID_ERROR);
 364                         goto out_abort;
 365                 }
 366
 367                 /*
 368                  *  No segments means no data.
 369                  */
 370                 if (!cp->segments)
 371                         dir = DMA_NONE;
 372         } else {
 373                 cp->data_len = 0;
 374                 cp->segments = 0;
 375         }
 376
 377         /*
 378          *  Set the data pointer.
 379          */
 380         switch (dir) {
 381         case DMA_BIDIRECTIONAL:
 382                 scmd_printk(KERN_INFO, cmd, "got DMA_BIDIRECTIONAL command");
 383                 sym_set_cam_status(cmd, DID_ERROR);
 384                 goto out_abort;
 385         case DMA_TO_DEVICE:
 386                 goalp = SCRIPTA_BA(np, data_out2) + 8;
 387                 lastp = goalp - 8 - (cp->segments * (2*4));
 388                 break;
 389         case DMA_FROM_DEVICE:
 390                 cp->host_flags |= HF_DATA_IN;
 391                 goalp = SCRIPTA_BA(np, data_in2) + 8;
 392                 lastp = goalp - 8 - (cp->segments * (2*4));
 393                 break;
 394         case DMA_NONE:
 395         default:
 396                 lastp = goalp = SCRIPTB_BA(np, no_data);
 397                 break;
 398         }
 399
 400         /*
 401          *  Set all pointers values needed by SCRIPTS.
 402          */
 403         cp->phys.head.lastp = cpu_to_scr(lastp);
 404         cp->phys.head.savep = cpu_to_scr(lastp);
 405         cp->startp          = cp->phys.head.savep;
 406         cp->goalp           = cpu_to_scr(goalp);
 407
 408         /*
 409          *  When `#ifed 1', the code below makes the driver
 410          *  panic on the first attempt to write to a SCSI device.
 411          *  It is the first test we want to do after a driver
 412          *  change that does not seem obviously safe. :)
 413          */
 414 #if 0
 415         switch (cp->cdb_buf[0]) {
 416         case 0x0A: case 0x2A: case 0xAA:
 417                 panic("XXXXXXXXXXXXX WRITE NOT YET ALLOWED XXXXXXXXXXXXXX\n");
 418                 break;
 419         default:
 420                 break;
 421         }
 422 #endif
 423
 424         /*
 425          *      activate this job.
 426          */
 427         sym_put_start_queue(np, cp);
 428         return 0;
 429
 430 out_abort:
 431         sym_free_ccb(np, cp);
 432         sym_xpt_done(np, cmd);
 433         return 0;
 434 }
 435
 436
 437 /*
 438  *  timer daemon.
 439  *
 440  *  Misused to keep the driver running when
 441  *  interrupts are not configured correctly.
 442  */
 443 static void sym_timer(struct sym_hcb *np)
 444 {
 445         unsigned long thistime = jiffies;
 446
 447         /*
 448          *  Restart the timer.
 449          */
 450         np->s.timer.expires = thistime + SYM_CONF_TIMER_INTERVAL;
 451         add_timer(&np->s.timer);
 452
 453         /*
 454          *  If we are resetting the ncr, wait for settle_time before
 455          *  clearing it. Then command processing will be resumed.
 456          */
 457         if (np->s.settle_time_valid) {
 458                 if (time_before_eq(np->s.settle_time, thistime)) {
 459                         if (sym_verbose >= 2 )
 460                                 printk("%s: command processing resumed\n",
 461                                        sym_name(np));
 462                         np->s.settle_time_valid = 0;
 463                 }
 464                 return;
 465         }
 466
 467         /*
 468          *      Nothing to do for now, but that may come.
 469          */
 470         if (np->s.lasttime + 4*HZ < thistime) {
 471                 np->s.lasttime = thistime;
 472         }
 473
 474 #ifdef SYM_CONF_PCIQ_MAY_MISS_COMPLETIONS
 475         /*
 476          *  Some way-broken PCI bridges may lead to
 477          *  completions being lost when the clearing
 478          *  of the INTFLY flag by the CPU occurs
 479          *  concurrently with the chip raising this flag.
 480          *  If this ever happen, lost completions will
 481          * be reaped here.
 482          */
 483         sym_wakeup_done(np);
 484 #endif
 485 }
 486
 487
 488 /*
 489  *  PCI BUS error handler.
 490  */
 491 void sym_log_bus_error(struct Scsi_Host *shost)
 492 {
 493         struct sym_data *sym_data = shost_priv(shost);
 494         struct pci_dev *pdev = sym_data->pdev;
 495         unsigned short pci_sts;
 496         pci_read_config_word(pdev, PCI_STATUS, &pci_sts);
 497         if (pci_sts & 0xf900) {
 498                 pci_write_config_word(pdev, PCI_STATUS, pci_sts);
 499                 shost_printk(KERN_WARNING, shost,
 500                         "PCI bus error: status = 0x%04x\n", pci_sts & 0xf900);
 501         }
 502 }
 503
 504 /*
 505  * queuecommand method.  Entered with the host adapter lock held and
 506  * interrupts disabled.
 507  */
 508 static int sym53c8xx_queue_command_lck(struct scsi_cmnd *cmd,
 509                                         void (*done)(struct scsi_cmnd *))
 510 {
 511         struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
 512         struct sym_ucmd *ucp = SYM_UCMD_PTR(cmd);
 513         int sts = 0;
 514
 515         cmd->scsi_done = done;
 516         memset(ucp, 0, sizeof(*ucp));
 517
 518         /*
 519          *  Shorten our settle_time if needed for
 520          *  this command not to time out.
 521          */
 522         if (np->s.settle_time_valid && cmd->request->timeout) {
 523                 unsigned long tlimit = jiffies + cmd->request->timeout;
 524                 tlimit -= SYM_CONF_TIMER_INTERVAL*2;
 525                 if (time_after(np->s.settle_time, tlimit)) {
 526                         np->s.settle_time = tlimit;
 527                 }
 528         }
 529
 530         if (np->s.settle_time_valid)
 531                 return SCSI_MLQUEUE_HOST_BUSY;
 532
 533         sts = sym_queue_command(np, cmd);
 534         if (sts)
 535                 return SCSI_MLQUEUE_HOST_BUSY;
 536         return 0;
 537 }
 538
 539 static DEF_SCSI_QCMD(sym53c8xx_queue_command)
 540
 541 /*
 542  *  Linux entry point of the interrupt handler.
 543  */
 544 static irqreturn_t sym53c8xx_intr(int irq, void *dev_id)
 545 {
 546         struct Scsi_Host *shost = dev_id;
 547         struct sym_data *sym_data = shost_priv(shost);
 548         irqreturn_t result;
 549
 550         /* Avoid spinloop trying to handle interrupts on frozen device */
 551         if (pci_channel_offline(sym_data->pdev))
 552                 return IRQ_NONE;
 553
 554         if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("[");
 555
 556         spin_lock(shost->host_lock);
 557         result = sym_interrupt(shost);
 558         spin_unlock(shost->host_lock);
 559
 560         if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("]\n");
 561
 562         return result;
 563 }
 564
 565 /*
 566  *  Linux entry point of the timer handler
 567  */
 568 static void sym53c8xx_timer(unsigned long npref)
 569 {
 570         struct sym_hcb *np = (struct sym_hcb *)npref;
 571         unsigned long flags;
 572
 573         spin_lock_irqsave(np->s.host->host_lock, flags);
 574         sym_timer(np);
 575         spin_unlock_irqrestore(np->s.host->host_lock, flags);
 576 }
 577
 578
 579 /*
 580  *  What the eh thread wants us to perform.
 581  */
 582 #define SYM_EH_ABORT            0
 583 #define SYM_EH_DEVICE_RESET     1
 584 #define SYM_EH_BUS_RESET        2
 585 #define SYM_EH_HOST_RESET       3
 586
 587 /*
 588  *  Generic method for our eh processing.
 589  *  The 'op' argument tells what we have to do.
 590  */
 591 static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd)
 592 {
 593         struct sym_ucmd *ucmd = SYM_UCMD_PTR(cmd);
 594         struct Scsi_Host *shost = cmd->device->host;
 595         struct sym_data *sym_data = shost_priv(shost);
 596         struct pci_dev *pdev = sym_data->pdev;
 597         struct sym_hcb *np = sym_data->ncb;
 598         SYM_QUEHEAD *qp;
 599         int cmd_queued = 0;
 600         int sts = -1;
 601         struct completion eh_done;
 602
 603         scmd_printk(KERN_WARNING, cmd, "%s operation started\n", opname);
 604
 605         /* We may be in an error condition because the PCI bus
 606          * went down. In this case, we need to wait until the
 607          * PCI bus is reset, the card is reset, and only then
 608          * proceed with the scsi error recovery.  There's no
 609          * point in hurrying; take a leisurely wait.
 610          */
 611 #define WAIT_FOR_PCI_RECOVERY   35
 612         if (pci_channel_offline(pdev)) {
 613                 int finished_reset = 0;
 614                 init_completion(&eh_done);
 615                 spin_lock_irq(shost->host_lock);
 616                 /* Make sure we didn't race */
 617                 if (pci_channel_offline(pdev)) {
 618                         BUG_ON(sym_data->io_reset);
 619                         sym_data->io_reset = &eh_done;
 620                 } else {
 621                         finished_reset = 1;
 622                 }
 623                 spin_unlock_irq(shost->host_lock);
 624                 if (!finished_reset)
 625                         finished_reset = wait_for_completion_timeout
 626                                                 (sym_data->io_reset,
 627                                                 WAIT_FOR_PCI_RECOVERY*HZ);
 628                 spin_lock_irq(shost->host_lock);
 629                 sym_data->io_reset = NULL;
 630                 spin_unlock_irq(shost->host_lock);
 631                 if (!finished_reset)
 632                         return SCSI_FAILED;
 633         }
 634
 635         spin_lock_irq(shost->host_lock);
 636         /* This one is queued in some place -> to wait for completion */
 637         FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
 638                 struct sym_ccb *cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
 639                 if (cp->cmd == cmd) {
 640                         cmd_queued = 1;
 641                         break;
 642                 }
 643         }
 644
 645         /* Try to proceed the operation we have been asked for */
 646         sts = -1;
 647         switch(op) {
 648         case SYM_EH_ABORT:
 649                 sts = sym_abort_scsiio(np, cmd, 1);
 650                 break;
 651         case SYM_EH_DEVICE_RESET:
 652                 sts = sym_reset_scsi_target(np, cmd->device->id);
 653                 break;
 654         case SYM_EH_BUS_RESET:
 655                 sym_reset_scsi_bus(np, 1);
 656                 sts = 0;
 657                 break;
 658         case SYM_EH_HOST_RESET:
 659                 sym_reset_scsi_bus(np, 0);
 660                 sym_start_up(shost, 1);
 661                 sts = 0;
 662                 break;
 663         default:
 664                 break;
 665         }
 666
 667         /* On error, restore everything and cross fingers :) */
 668         if (sts)
 669                 cmd_queued = 0;
 670
 671         if (cmd_queued) {
 672                 init_completion(&eh_done);
 673                 ucmd->eh_done = &eh_done;
 674                 spin_unlock_irq(shost->host_lock);
 675                 if (!wait_for_completion_timeout(&eh_done, 5*HZ)) {
 676                         ucmd->eh_done = NULL;
 677                         sts = -2;
 678                 }
 679         } else {
 680                 spin_unlock_irq(shost->host_lock);
 681         }
 682
 683         dev_warn(&cmd->device->sdev_gendev, "%s operation %s.\n", opname,
 684                         sts==0 ? "complete" :sts==-2 ? "timed-out" : "failed");
 685         return sts ? SCSI_FAILED : SCSI_SUCCESS;
 686 }
 687
 688
 689 /*
 690  * Error handlers called from the eh thread (one thread per HBA).
 691  */
 692 static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
 693 {
 694         return sym_eh_handler(SYM_EH_ABORT, "ABORT", cmd);
 695 }
 696
 697 static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
 698 {
 699         return sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
 700 }
 701
 702 static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 703 {
 704         return sym_eh_handler(SYM_EH_BUS_RESET, "BUS RESET", cmd);
 705 }
 706
 707 static int sym53c8xx_eh_host_reset_handler(struct scsi_cmnd *cmd)
 708 {
 709         return sym_eh_handler(SYM_EH_HOST_RESET, "HOST RESET", cmd);
 710 }
 711
 712 /*
 713  *  Tune device queuing depth, according to various limits.
 714  */
 715 static void sym_tune_dev_queuing(struct sym_tcb *tp, int lun, u_short reqtags)
 716 {
 717         struct sym_lcb *lp = sym_lp(tp, lun);
 718         u_short oldtags;
 719
 720         if (!lp)
 721                 return;
 722
 723         oldtags = lp->s.reqtags;
 724
 725         if (reqtags > lp->s.scdev_depth)
 726                 reqtags = lp->s.scdev_depth;
 727
 728         lp->s.reqtags     = reqtags;
 729
 730         if (reqtags != oldtags) {
 731                 dev_info(&tp->starget->dev,
 732                          "tagged command queuing %s, command queue depth %d.\n",
 733                           lp->s.reqtags ? "enabled" : "disabled", reqtags);
 734         }
 735 }
 736
 737 static int sym53c8xx_slave_alloc(struct scsi_device *sdev)
 738 {
 739         struct sym_hcb *np = sym_get_hcb(sdev->host);
 740         struct sym_tcb *tp = &np->target[sdev->id];
 741         struct sym_lcb *lp;
 742         unsigned long flags;
 743         int error;
 744
 745         if (sdev->id >= SYM_CONF_MAX_TARGET || sdev->lun >= SYM_CONF_MAX_LUN)
 746                 return -ENXIO;
 747
 748         spin_lock_irqsave(np->s.host->host_lock, flags);
 749
 750         /*
 751          * Fail the device init if the device is flagged NOSCAN at BOOT in
 752          * the NVRAM.  This may speed up boot and maintain coherency with
 753          * BIOS device numbering.  Clearing the flag allows the user to
 754          * rescan skipped devices later.  We also return an error for
 755          * devices not flagged for SCAN LUNS in the NVRAM since some single
 756          * lun devices behave badly when asked for a non zero LUN.
 757          */
 758
 759         if (tp->usrflags & SYM_SCAN_BOOT_DISABLED) {
 760                 tp->usrflags &= ~SYM_SCAN_BOOT_DISABLED;
 761                 starget_printk(KERN_INFO, sdev->sdev_target,
 762                                 "Scan at boot disabled in NVRAM\n");
 763                 error = -ENXIO;
 764                 goto out;
 765         }
 766
 767         if (tp->usrflags & SYM_SCAN_LUNS_DISABLED) {
 768                 if (sdev->lun != 0) {
 769                         error = -ENXIO;
 770                         goto out;
 771                 }
 772                 starget_printk(KERN_INFO, sdev->sdev_target,
 773                                 "Multiple LUNs disabled in NVRAM\n");
 774         }
 775
 776         lp = sym_alloc_lcb(np, sdev->id, sdev->lun);
 777         if (!lp) {
 778                 error = -ENOMEM;
 779                 goto out;
 780         }
 781         if (tp->nlcb == 1)
 782                 tp->starget = sdev->sdev_target;
 783
 784         spi_min_period(tp->starget) = tp->usr_period;
 785         spi_max_width(tp->starget) = tp->usr_width;
 786
 787         error = 0;
 788 out:
 789         spin_unlock_irqrestore(np->s.host->host_lock, flags);
 790
 791         return error;
 792 }
 793
 794 /*
 795  * Linux entry point for device queue sizing.
 796  */
 797 static int sym53c8xx_slave_configure(struct scsi_device *sdev)
 798 {
 799         struct sym_hcb *np = sym_get_hcb(sdev->host);
 800         struct sym_tcb *tp = &np->target[sdev->id];
 801         struct sym_lcb *lp = sym_lp(tp, sdev->lun);
 802         int reqtags, depth_to_use;
 803
 804         /*
 805          *  Get user flags.
 806          */
 807         lp->curr_flags = lp->user_flags;
 808
 809         /*
 810          *  Select queue depth from driver setup.
 811          *  Do not use more than configured by user.
 812          *  Use at least 1.
 813          *  Do not use more than our maximum.
 814          */
 815         reqtags = sym_driver_setup.max_tag;
 816         if (reqtags > tp->usrtags)
 817                 reqtags = tp->usrtags;
 818         if (!sdev->tagged_supported)
 819                 reqtags = 0;
 820         if (reqtags > SYM_CONF_MAX_TAG)
 821                 reqtags = SYM_CONF_MAX_TAG;
 822         depth_to_use = reqtags ? reqtags : 1;
 823         scsi_adjust_queue_depth(sdev,
 824                                 sdev->tagged_supported ? MSG_SIMPLE_TAG : 0,
 825                                 depth_to_use);
 826         lp->s.scdev_depth = depth_to_use;
 827         sym_tune_dev_queuing(tp, sdev->lun, reqtags);
 828
 829         if (!spi_initial_dv(sdev->sdev_target))
 830                 spi_dv_device(sdev);
 831
 832         return 0;
 833 }
 834
 835 static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
 836 {
 837         struct sym_hcb *np = sym_get_hcb(sdev->host);
 838         struct sym_tcb *tp = &np->target[sdev->id];
 839         struct sym_lcb *lp = sym_lp(tp, sdev->lun);
 840         unsigned long flags;
 841
 842         /* if slave_alloc returned before allocating a sym_lcb, return */
 843         if (!lp)
 844                 return;
 845
 846         spin_lock_irqsave(np->s.host->host_lock, flags);
 847
 848         if (lp->busy_itlq || lp->busy_itl) {
 849                 /*
 850                  * This really shouldn't happen, but we can't return an error
 851                  * so let's try to stop all on-going I/O.
 852                  */
 853                 starget_printk(KERN_WARNING, tp->starget,
 854                                "Removing busy LCB (%d)\n", sdev->lun);
 855                 sym_reset_scsi_bus(np, 1);
 856         }
 857
 858         if (sym_free_lcb(np, sdev->id, sdev->lun) == 0) {
 859                 /*
 860                  * It was the last unit for this target.
 861                  */
 862                 tp->head.sval        = 0;
 863                 tp->head.wval        = np->rv_scntl3;
 864                 tp->head.uval        = 0;
 865                 tp->tgoal.check_nego = 1;
 866                 tp->starget          = NULL;
 867         }
 868
 869         spin_unlock_irqrestore(np->s.host->host_lock, flags);
 870 }
 871
 872 /*
 873  *  Linux entry point for info() function
 874  */
 875 static const char *sym53c8xx_info (struct Scsi_Host *host)
 876 {
 877         return SYM_DRIVER_NAME;
 878 }
 879
 880
 881 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
 882 /*
 883  *  Proc file system stuff
 884  *
 885  *  A read operation returns adapter information.
 886  *  A write operation is a control command.
 887  *  The string is parsed in the driver code and the command is passed
 888  *  to the sym_usercmd() function.
 889  */
 890
 891 #ifdef SYM_LINUX_USER_COMMAND_SUPPORT
 892
 893 struct  sym_usrcmd {
 894         u_long  target;
 895         u_long  lun;
 896         u_long  data;
 897         u_long  cmd;
 898 };
 899
 900 #define UC_SETSYNC      10
 901 #define UC_SETTAGS      11
 902 #define UC_SETDEBUG     12
 903 #define UC_SETWIDE      14
 904 #define UC_SETFLAG      15
 905 #define UC_SETVERBOSE   17
 906 #define UC_RESETDEV     18
 907 #define UC_CLEARDEV     19
 908
 909 static void sym_exec_user_command (struct sym_hcb *np, struct sym_usrcmd *uc)
 910 {
 911         struct sym_tcb *tp;
 912         int t, l;
 913
 914         switch (uc->cmd) {
 915         case 0: return;
 916
 917 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
 918         case UC_SETDEBUG:
 919                 sym_debug_flags = uc->data;
 920                 break;
 921 #endif
 922         case UC_SETVERBOSE:
 923                 np->verbose = uc->data;
 924                 break;
 925         default:
 926                 /*
 927                  * We assume that other commands apply to targets.
 928                  * This should always be the case and avoid the below
 929                  * 4 lines to be repeated 6 times.
 930                  */
 931                 for (t = 0; t < SYM_CONF_MAX_TARGET; t++) {
 932                         if (!((uc->target >> t) & 1))
 933                                 continue;
 934                         tp = &np->target[t];
 935                         if (!tp->nlcb)
 936                                 continue;
 937
 938                         switch (uc->cmd) {
 939
 940                         case UC_SETSYNC:
 941                                 if (!uc->data || uc->data >= 255) {
 942                                         tp->tgoal.iu = tp->tgoal.dt =
 943                                                 tp->tgoal.qas = 0;
 944                                         tp->tgoal.offset = 0;
 945                                 } else if (uc->data <= 9 && np->minsync_dt) {
 946                                         if (uc->data < np->minsync_dt)
 947                                                 uc->data = np->minsync_dt;
 948                                         tp->tgoal.iu = tp->tgoal.dt =
 949                                                 tp->tgoal.qas = 1;
 950                                         tp->tgoal.width = 1;
 951                                         tp->tgoal.period = uc->data;
 952                                         tp->tgoal.offset = np->maxoffs_dt;
 953                                 } else {
 954                                         if (uc->data < np->minsync)
 955                                                 uc->data = np->minsync;
 956                                         tp->tgoal.iu = tp->tgoal.dt =
 957                                                 tp->tgoal.qas = 0;
 958                                         tp->tgoal.period = uc->data;
 959                                         tp->tgoal.offset = np->maxoffs;
 960                                 }
 961                                 tp->tgoal.check_nego = 1;
 962                                 break;
 963                         case UC_SETWIDE:
 964                                 tp->tgoal.width = uc->data ? 1 : 0;
 965                                 tp->tgoal.check_nego = 1;
 966                                 break;
 967                         case UC_SETTAGS:
 968                                 for (l = 0; l < SYM_CONF_MAX_LUN; l++)
 969                                         sym_tune_dev_queuing(tp, l, uc->data);
 970                                 break;
 971                         case UC_RESETDEV:
 972                                 tp->to_reset = 1;
 973                                 np->istat_sem = SEM;
 974                                 OUTB(np, nc_istat, SIGP|SEM);
 975                                 break;
 976                         case UC_CLEARDEV:
 977                                 for (l = 0; l < SYM_CONF_MAX_LUN; l++) {
 978                                         struct sym_lcb *lp = sym_lp(tp, l);
 979                                         if (lp) lp->to_clear = 1;
 980                                 }
 981                                 np->istat_sem = SEM;
 982                                 OUTB(np, nc_istat, SIGP|SEM);
 983                                 break;
 984                         case UC_SETFLAG:
 985                                 tp->usrflags = uc->data;
 986                                 break;
 987                         }
 988                 }
 989                 break;
 990         }
 991 }
 992
 993 static int sym_skip_spaces(char *ptr, int len)
 994 {
 995         int cnt, c;
 996
 997         for (cnt = len; cnt > 0 && (c = *ptr++) && isspace(c); cnt--);
 998
 999         return (len - cnt);
1000 }
1001
1002 static int get_int_arg(char *ptr, int len, u_long *pv)
1003 {
1004         char *end;
1005
1006         *pv = simple_strtoul(ptr, &end, 10);
1007         return (end - ptr);
1008 }
1009
1010 static int is_keyword(char *ptr, int len, char *verb)
1011 {
1012         int verb_len = strlen(verb);
1013
1014         if (len >= verb_len && !memcmp(verb, ptr, verb_len))
1015                 return verb_len;
1016         else
1017                 return 0;
1018 }
1019
1020 #define SKIP_SPACES(ptr, len)                                           \
1021         if ((arg_len = sym_skip_spaces(ptr, len)) < 1)                  \
1022                 return -EINVAL;                                         \
1023         ptr += arg_len; len -= arg_len;
1024
1025 #define GET_INT_ARG(ptr, len, v)                                        \
1026         if (!(arg_len = get_int_arg(ptr, len, &(v))))                   \
1027                 return -EINVAL;                                         \
1028         ptr += arg_len; len -= arg_len;
1029
1030
1031 /*
1032  * Parse a control command
1033  */
1034
1035 static int sym_user_command(struct Scsi_Host *shost, char *buffer, int length)
1036 {
1037         struct sym_hcb *np = sym_get_hcb(shost);
1038         char *ptr       = buffer;
1039         int len         = length;
1040         struct sym_usrcmd cmd, *uc = &cmd;
1041         int             arg_len;
1042         u_long          target;
1043
1044         memset(uc, 0, sizeof(*uc));
1045
1046         if (len > 0 && ptr[len-1] == '\n')
1047                 --len;
1048
1049         if      ((arg_len = is_keyword(ptr, len, "setsync")) != 0)
1050                 uc->cmd = UC_SETSYNC;
1051         else if ((arg_len = is_keyword(ptr, len, "settags")) != 0)
1052                 uc->cmd = UC_SETTAGS;
1053         else if ((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
1054                 uc->cmd = UC_SETVERBOSE;
1055         else if ((arg_len = is_keyword(ptr, len, "setwide")) != 0)
1056                 uc->cmd = UC_SETWIDE;
1057 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1058         else if ((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
1059                 uc->cmd = UC_SETDEBUG;
1060 #endif
1061         else if ((arg_len = is_keyword(ptr, len, "setflag")) != 0)
1062                 uc->cmd = UC_SETFLAG;
1063         else if ((arg_len = is_keyword(ptr, len, "resetdev")) != 0)
1064                 uc->cmd = UC_RESETDEV;
1065         else if ((arg_len = is_keyword(ptr, len, "cleardev")) != 0)
1066                 uc->cmd = UC_CLEARDEV;
1067         else
1068                 arg_len = 0;
1069
1070 #ifdef DEBUG_PROC_INFO
1071 printk("sym_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
1072 #endif
1073
1074         if (!arg_len)
1075                 return -EINVAL;
1076         ptr += arg_len; len -= arg_len;
1077
1078         switch(uc->cmd) {
1079         case UC_SETSYNC:
1080         case UC_SETTAGS:
1081         case UC_SETWIDE:
1082         case UC_SETFLAG:
1083         case UC_RESETDEV:
1084         case UC_CLEARDEV:
1085                 SKIP_SPACES(ptr, len);
1086                 if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
1087                         ptr += arg_len; len -= arg_len;
1088                         uc->target = ~0;
1089                 } else {
1090                         GET_INT_ARG(ptr, len, target);
1091                         uc->target = (1<<target);
1092 #ifdef DEBUG_PROC_INFO
1093 printk("sym_user_command: target=%ld\n", target);
1094 #endif
1095                 }
1096                 break;
1097         }
1098
1099         switch(uc->cmd) {
1100         case UC_SETVERBOSE:
1101         case UC_SETSYNC:
1102         case UC_SETTAGS:
1103         case UC_SETWIDE:
1104                 SKIP_SPACES(ptr, len);
1105                 GET_INT_ARG(ptr, len, uc->data);
1106 #ifdef DEBUG_PROC_INFO
1107 printk("sym_user_command: data=%ld\n", uc->data);
1108 #endif
1109                 break;
1110 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1111         case UC_SETDEBUG:
1112                 while (len > 0) {
1113                         SKIP_SPACES(ptr, len);
1114                         if      ((arg_len = is_keyword(ptr, len, "alloc")))
1115                                 uc->data |= DEBUG_ALLOC;
1116                         else if ((arg_len = is_keyword(ptr, len, "phase")))
1117                                 uc->data |= DEBUG_PHASE;
1118                         else if ((arg_len = is_keyword(ptr, len, "queue")))
1119                                 uc->data |= DEBUG_QUEUE;
1120                         else if ((arg_len = is_keyword(ptr, len, "result")))
1121                                 uc->data |= DEBUG_RESULT;
1122                         else if ((arg_len = is_keyword(ptr, len, "scatter")))
1123                                 uc->data |= DEBUG_SCATTER;
1124                         else if ((arg_len = is_keyword(ptr, len, "script")))
1125                                 uc->data |= DEBUG_SCRIPT;
1126                         else if ((arg_len = is_keyword(ptr, len, "tiny")))
1127                                 uc->data |= DEBUG_TINY;
1128                         else if ((arg_len = is_keyword(ptr, len, "timing")))
1129                                 uc->data |= DEBUG_TIMING;
1130                         else if ((arg_len = is_keyword(ptr, len, "nego")))
1131                                 uc->data |= DEBUG_NEGO;
1132                         else if ((arg_len = is_keyword(ptr, len, "tags")))
1133                                 uc->data |= DEBUG_TAGS;
1134                         else if ((arg_len = is_keyword(ptr, len, "pointer")))
1135                                 uc->data |= DEBUG_POINTER;
1136                         else
1137                                 return -EINVAL;
1138                         ptr += arg_len; len -= arg_len;
1139                 }
1140 #ifdef DEBUG_PROC_INFO
1141 printk("sym_user_command: data=%ld\n", uc->data);
1142 #endif
1143                 break;
1144 #endif /* SYM_LINUX_DEBUG_CONTROL_SUPPORT */
1145         case UC_SETFLAG:
1146                 while (len > 0) {
1147                         SKIP_SPACES(ptr, len);
1148                         if      ((arg_len = is_keyword(ptr, len, "no_disc")))
1149                                 uc->data &= ~SYM_DISC_ENABLED;
1150                         else
1151                                 return -EINVAL;
1152                         ptr += arg_len; len -= arg_len;
1153                 }
1154                 break;
1155         default:
1156                 break;
1157         }
1158
1159         if (len)
1160                 return -EINVAL;
1161         else {
1162                 unsigned long flags;
1163
1164                 spin_lock_irqsave(shost->host_lock, flags);
1165                 sym_exec_user_command(np, uc);
1166                 spin_unlock_irqrestore(shost->host_lock, flags);
1167         }
1168         return length;
1169 }
1170
1171 #endif  /* SYM_LINUX_USER_COMMAND_SUPPORT */
1172
1173
1174 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1175 /*
1176  *  Informations through the proc file system.
1177  */
1178 struct info_str {
1179         char *buffer;
1180         int length;
1181         int offset;
1182         int pos;
1183 };
1184
1185 static void copy_mem_info(struct info_str *info, char *data, int len)
1186 {
1187         if (info->pos + len > info->length)
1188                 len = info->length - info->pos;
1189
1190         if (info->pos + len < info->offset) {
1191                 info->pos += len;
1192                 return;
1193         }
1194         if (info->pos < info->offset) {
1195                 data += (info->offset - info->pos);
1196                 len  -= (info->offset - info->pos);
1197         }
1198
1199         if (len > 0) {
1200                 memcpy(info->buffer + info->pos, data, len);
1201                 info->pos += len;
1202         }
1203 }
1204
1205 static int copy_info(struct info_str *info, char *fmt, ...)
1206 {
1207         va_list args;
1208         char buf[81];
1209         int len;
1210
1211         va_start(args, fmt);
1212         len = vsprintf(buf, fmt, args);
1213         va_end(args);
1214
1215         copy_mem_info(info, buf, len);
1216         return len;
1217 }
1218
1219 /*
1220  *  Copy formatted information into the input buffer.
1221  */
1222 static int sym_host_info(struct Scsi_Host *shost, char *ptr, off_t offset, int len)
1223 {
1224         struct sym_data *sym_data = shost_priv(shost);
1225         struct pci_dev *pdev = sym_data->pdev;
1226         struct sym_hcb *np = sym_data->ncb;
1227         struct info_str info;
1228
1229         info.buffer     = ptr;
1230         info.length     = len;
1231         info.offset     = offset;
1232         info.pos        = 0;
1233
1234         copy_info(&info, "Chip " NAME53C "%s, device id 0x%x, "
1235                          "revision id 0x%x\n", np->s.chip_name,
1236                          pdev->device, pdev->revision);
1237         copy_info(&info, "At PCI address %s, IRQ %u\n",
1238                          pci_name(pdev), pdev->irq);
1239         copy_info(&info, "Min. period factor %d, %s SCSI BUS%s\n",
1240                          (int) (np->minsync_dt ? np->minsync_dt : np->minsync),
1241                          np->maxwide ? "Wide" : "Narrow",
1242                          np->minsync_dt ? ", DT capable" : "");
1243
1244         copy_info(&info, "Max. started commands %d, "
1245                          "max. commands per LUN %d\n",
1246                          SYM_CONF_MAX_START, SYM_CONF_MAX_TAG);
1247
1248         return info.pos > info.offset? info.pos - info.offset : 0;
1249 }
1250 #endif /* SYM_LINUX_USER_INFO_SUPPORT */
1251
1252 /*
1253  *  Entry point of the scsi proc fs of the driver.
1254  *  - func = 0 means read  (returns adapter infos)
1255  *  - func = 1 means write (not yet merget from sym53c8xx)
1256  */
1257 static int sym53c8xx_proc_info(struct Scsi_Host *shost, char *buffer,
1258                         char **start, off_t offset, int length, int func)
1259 {
1260         int retv;
1261
1262         if (func) {
1263 #ifdef  SYM_LINUX_USER_COMMAND_SUPPORT
1264                 retv = sym_user_command(shost, buffer, length);
1265 #else
1266                 retv = -EINVAL;
1267 #endif
1268         } else {
1269                 if (start)
1270                         *start = buffer;
1271 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1272                 retv = sym_host_info(shost, buffer, offset, length);
1273 #else
1274                 retv = -EINVAL;
1275 #endif
1276         }
1277
1278         return retv;
1279 }
1280 #endif /* SYM_LINUX_PROC_INFO_SUPPORT */
1281
1282 /*
1283  * Free resources claimed by sym_iomap_device().  Note that
1284  * sym_free_resources() should be used instead of this function after calling
1285  * sym_attach().
1286  */
1287 static void sym_iounmap_device(struct sym_device *device)
1288 {
1289         if (device->s.ioaddr)
1290                 pci_iounmap(device->pdev, device->s.ioaddr);
1291         if (device->s.ramaddr)
1292                 pci_iounmap(device->pdev, device->s.ramaddr);
1293 }
1294
1295 /*
1296  *      Free controller resources.
1297  */
1298 static void sym_free_resources(struct sym_hcb *np, struct pci_dev *pdev,
1299                 int do_free_irq)
1300 {
1301         /*
1302          *  Free O/S specific resources.
1303          */
1304         if (do_free_irq)
1305                 free_irq(pdev->irq, np->s.host);
1306         if (np->s.ioaddr)
1307                 pci_iounmap(pdev, np->s.ioaddr);
1308         if (np->s.ramaddr)
1309                 pci_iounmap(pdev, np->s.ramaddr);
1310         /*
1311          *  Free O/S independent resources.
1312          */
1313         sym_hcb_free(np);
1314
1315         sym_mfree_dma(np, sizeof(*np), "HCB");
1316 }
1317
1318 /*
1319  *  Host attach and initialisations.
1320  *
1321  *  Allocate host data and ncb structure.
1322  *  Remap MMIO region.
1323  *  Do chip initialization.
1324  *  If all is OK, install interrupt handling and
1325  *  start the timer daemon.
1326  */
1327 static struct Scsi_Host *sym_attach(struct scsi_host_template *tpnt, int unit,
1328                                     struct sym_device *dev)
1329 {
1330         struct sym_data *sym_data;
1331         struct sym_hcb *np = NULL;
1332         struct Scsi_Host *shost = NULL;
1333         struct pci_dev *pdev = dev->pdev;
1334         unsigned long flags;
1335         struct sym_fw *fw;
1336         int do_free_irq = 0;
1337
1338         printk(KERN_INFO "sym%d: <%s> rev 0x%x at pci %s irq %u\n",
1339                 unit, dev->chip.name, pdev->revision, pci_name(pdev),
1340                 pdev->irq);
1341
1342         /*
1343          *  Get the firmware for this chip.
1344          */
1345         fw = sym_find_firmware(&dev->chip);
1346         if (!fw)
1347                 goto attach_failed;
1348
1349         shost = scsi_host_alloc(tpnt, sizeof(*sym_data));
1350         if (!shost)
1351                 goto attach_failed;
1352         sym_data = shost_priv(shost);
1353
1354         /*
1355          *  Allocate immediately the host control block,
1356          *  since we are only expecting to succeed. :)
1357          *  We keep track in the HCB of all the resources that
1358          *  are to be released on error.
1359          */
1360         np = __sym_calloc_dma(&pdev->dev, sizeof(*np), "HCB");
1361         if (!np)
1362                 goto attach_failed;
1363         np->bus_dmat = &pdev->dev; /* Result in 1 DMA pool per HBA */
1364         sym_data->ncb = np;
1365         sym_data->pdev = pdev;
1366         np->s.host = shost;
1367
1368         pci_set_drvdata(pdev, shost);
1369
1370         /*
1371          *  Copy some useful infos to the HCB.
1372          */
1373         np->hcb_ba      = vtobus(np);
1374         np->verbose     = sym_driver_setup.verbose;
1375         np->s.unit      = unit;
1376         np->features    = dev->chip.features;
1377         np->clock_divn  = dev->chip.nr_divisor;
1378         np->maxoffs     = dev->chip.offset_max;
1379         np->maxburst    = dev->chip.burst_max;
1380         np->myaddr      = dev->host_id;
1381         np->mmio_ba     = (u32)dev->mmio_base;
1382         np->ram_ba      = (u32)dev->ram_base;
1383         np->s.ioaddr    = dev->s.ioaddr;
1384         np->s.ramaddr   = dev->s.ramaddr;
1385
1386         /*
1387          *  Edit its name.
1388          */
1389         strlcpy(np->s.chip_name, dev->chip.name, sizeof(np->s.chip_name));
1390         sprintf(np->s.inst_name, "sym%d", np->s.unit);
1391
1392         if ((SYM_CONF_DMA_ADDRESSING_MODE > 0) && (np->features & FE_DAC) &&
1393                         !pci_set_dma_mask(pdev, DMA_DAC_MASK)) {
1394                 set_dac(np);
1395         } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
1396                 printf_warning("%s: No suitable DMA available\n", sym_name(np));
1397                 goto attach_failed;
1398         }
1399
1400         if (sym_hcb_attach(shost, fw, dev->nvram))
1401                 goto attach_failed;
1402
1403         /*
1404          *  Install the interrupt handler.
1405          *  If we synchonize the C code with SCRIPTS on interrupt,
1406          *  we do not want to share the INTR line at all.
1407          */
1408         if (request_irq(pdev->irq, sym53c8xx_intr, IRQF_SHARED, NAME53C8XX,
1409                         shost)) {
1410                 printf_err("%s: request irq %u failure\n",
1411                         sym_name(np), pdev->irq);
1412                 goto attach_failed;
1413         }
1414         do_free_irq = 1;
1415
1416         /*
1417          *  After SCSI devices have been opened, we cannot
1418          *  reset the bus safely, so we do it here.
1419          */
1420         spin_lock_irqsave(shost->host_lock, flags);
1421         if (sym_reset_scsi_bus(np, 0))
1422                 goto reset_failed;
1423
1424         /*
1425          *  Start the SCRIPTS.
1426          */
1427         sym_start_up(shost, 1);
1428
1429         /*
1430          *  Start the timer daemon
1431          */
1432         init_timer(&np->s.timer);
1433         np->s.timer.data     = (unsigned long) np;
1434         np->s.timer.function = sym53c8xx_timer;
1435         np->s.lasttime=0;
1436         sym_timer (np);
1437
1438         /*
1439          *  Fill Linux host instance structure
1440          *  and return success.
1441          */
1442         shost->max_channel      = 0;
1443         shost->this_id          = np->myaddr;
1444         shost->max_id           = np->maxwide ? 16 : 8;
1445         shost->max_lun          = SYM_CONF_MAX_LUN;
1446         shost->unique_id        = pci_resource_start(pdev, 0);
1447         shost->cmd_per_lun      = SYM_CONF_MAX_TAG;
1448         shost->can_queue        = (SYM_CONF_MAX_START-2);
1449         shost->sg_tablesize     = SYM_CONF_MAX_SG;
1450         shost->max_cmd_len      = 16;
1451         BUG_ON(sym2_transport_template == NULL);
1452         shost->transportt       = sym2_transport_template;
1453
1454         /* 53c896 rev 1 errata: DMA may not cross 16MB boundary */
1455         if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && pdev->revision < 2)
1456                 shost->dma_boundary = 0xFFFFFF;
1457
1458         spin_unlock_irqrestore(shost->host_lock, flags);
1459
1460         return shost;
1461
1462  reset_failed:
1463         printf_err("%s: FATAL ERROR: CHECK SCSI BUS - CABLES, "
1464                    "TERMINATION, DEVICE POWER etc.!\n", sym_name(np));
1465         spin_unlock_irqrestore(shost->host_lock, flags);
1466  attach_failed:
1467         printf_info("sym%d: giving up ...\n", unit);
1468         if (np)
1469                 sym_free_resources(np, pdev, do_free_irq);
1470         else
1471                 sym_iounmap_device(dev);
1472         if (shost)
1473                 scsi_host_put(shost);
1474
1475         return NULL;
1476  }
1477
1478
1479 /*
1480  *    Detect and try to read SYMBIOS and TEKRAM NVRAM.
1481  */
1482 #if SYM_CONF_NVRAM_SUPPORT
1483 static void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1484 {
1485         devp->nvram = nvp;
1486         nvp->type = 0;
1487
1488         sym_read_nvram(devp, nvp);
1489 }
1490 #else
1491 static inline void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1492 {
1493 }
1494 #endif  /* SYM_CONF_NVRAM_SUPPORT */
1495
1496 static int sym_check_supported(struct sym_device *device)
1497 {
1498         struct sym_chip *chip;
1499         struct pci_dev *pdev = device->pdev;
1500         unsigned long io_port = pci_resource_start(pdev, 0);
1501         int i;
1502
1503         /*
1504          *  If user excluded this chip, do not initialize it.
1505          *  I hate this code so much.  Must kill it.
1506          */
1507         if (io_port) {
1508                 for (i = 0 ; i < 8 ; i++) {
1509                         if (sym_driver_setup.excludes[i] == io_port)
1510                                 return -ENODEV;
1511                 }
1512         }
1513
1514         /*
1515          * Check if the chip is supported.  Then copy the chip description
1516          * to our device structure so we can make it match the actual device
1517          * and options.
1518          */
1519         chip = sym_lookup_chip_table(pdev->device, pdev->revision);
1520         if (!chip) {
1521                 dev_info(&pdev->dev, "device not supported\n");
1522                 return -ENODEV;
1523         }
1524         memcpy(&device->chip, chip, sizeof(device->chip));
1525
1526         return 0;
1527 }
1528
1529 /*
1530  * Ignore Symbios chips controlled by various RAID controllers.
1531  * These controllers set value 0x52414944 at RAM end - 16.
1532  */
1533 static int sym_check_raid(struct sym_device *device)
1534 {
1535         unsigned int ram_size, ram_val;
1536
1537         if (!device->s.ramaddr)
1538                 return 0;
1539
1540         if (device->chip.features & FE_RAM8K)
1541                 ram_size = 8192;
1542         else
1543                 ram_size = 4096;
1544
1545         ram_val = readl(device->s.ramaddr + ram_size - 16);
1546         if (ram_val != 0x52414944)
1547                 return 0;
1548
1549         dev_info(&device->pdev->dev,
1550                         "not initializing, driven by RAID controller.\n");
1551         return -ENODEV;
1552 }
1553
1554 static int sym_set_workarounds(struct sym_device *device)
1555 {
1556         struct sym_chip *chip = &device->chip;
1557         struct pci_dev *pdev = device->pdev;
1558         u_short status_reg;
1559
1560         /*
1561          *  (ITEM 12 of a DEL about the 896 I haven't yet).
1562          *  We must ensure the chip will use WRITE AND INVALIDATE.
1563          *  The revision number limit is for now arbitrary.
1564          */
1565         if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && pdev->revision < 0x4) {
1566                 chip->features  |= (FE_WRIE | FE_CLSE);
1567         }
1568
1569         /* If the chip can do Memory Write Invalidate, enable it */
1570         if (chip->features & FE_WRIE) {
1571                 if (pci_set_mwi(pdev))
1572                         return -ENODEV;
1573         }
1574
1575         /*
1576          *  Work around for errant bit in 895A. The 66Mhz
1577          *  capable bit is set erroneously. Clear this bit.
1578          *  (Item 1 DEL 533)
1579          *
1580          *  Make sure Config space and Features agree.
1581          *
1582          *  Recall: writes are not normal to status register -
1583          *  write a 1 to clear and a 0 to leave unchanged.
1584          *  Can only reset bits.
1585          */
1586         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1587         if (chip->features & FE_66MHZ) {
1588                 if (!(status_reg & PCI_STATUS_66MHZ))
1589                         chip->features &= ~FE_66MHZ;
1590         } else {
1591                 if (status_reg & PCI_STATUS_66MHZ) {
1592                         status_reg = PCI_STATUS_66MHZ;
1593                         pci_write_config_word(pdev, PCI_STATUS, status_reg);
1594                         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1595                 }
1596         }
1597
1598         return 0;
1599 }
1600
1601 /*
1602  * Map HBA registers and on-chip SRAM (if present).
1603  */
1604 static int sym_iomap_device(struct sym_device *device)
1605 {
1606         struct pci_dev *pdev = device->pdev;
1607         struct pci_bus_region bus_addr;
1608         int i = 2;
1609
1610         pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[1]);
1611         device->mmio_base = bus_addr.start;
1612
1613         if (device->chip.features & FE_RAM) {
1614                 /*
1615                  * If the BAR is 64-bit, resource 2 will be occupied by the
1616                  * upper 32 bits
1617                  */
1618                 if (!pdev->resource[i].flags)
1619                         i++;
1620                 pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[i]);
1621                 device->ram_base = bus_addr.start;
1622         }
1623
1624 #ifdef CONFIG_SCSI_SYM53C8XX_MMIO
1625         if (device->mmio_base)
1626                 device->s.ioaddr = pci_iomap(pdev, 1,
1627                                                 pci_resource_len(pdev, 1));
1628 #endif
1629         if (!device->s.ioaddr)
1630                 device->s.ioaddr = pci_iomap(pdev, 0,
1631                                                 pci_resource_len(pdev, 0));
1632         if (!device->s.ioaddr) {
1633                 dev_err(&pdev->dev, "could not map registers; giving up.\n");
1634                 return -EIO;
1635         }
1636         if (device->ram_base) {
1637                 device->s.ramaddr = pci_iomap(pdev, i,
1638                                                 pci_resource_len(pdev, i));
1639                 if (!device->s.ramaddr) {
1640                         dev_warn(&pdev->dev,
1641                                 "could not map SRAM; continuing anyway.\n");
1642                         device->ram_base = 0;
1643                 }
1644         }
1645
1646         return 0;
1647 }
1648
1649 /*
1650  * The NCR PQS and PDS cards are constructed as a DEC bridge
1651  * behind which sits a proprietary NCR memory controller and
1652  * either four or two 53c875s as separate devices.  We can tell
1653  * if an 875 is part of a PQS/PDS or not since if it is, it will
1654  * be on the same bus as the memory controller.  In its usual
1655  * mode of operation, the 875s are slaved to the memory
1656  * controller for all transfers.  To operate with the Linux
1657  * driver, the memory controller is disabled and the 875s
1658  * freed to function independently.  The only wrinkle is that
1659  * the preset SCSI ID (which may be zero) must be read in from
1660  * a special configuration space register of the 875.
1661  */
1662 static void sym_config_pqs(struct pci_dev *pdev, struct sym_device *sym_dev)
1663 {
1664         int slot;
1665         u8 tmp;
1666
1667         for (slot = 0; slot < 256; slot++) {
1668                 struct pci_dev *memc = pci_get_slot(pdev->bus, slot);
1669
1670                 if (!memc || memc->vendor != 0x101a || memc->device == 0x0009) {
1671                         pci_dev_put(memc);
1672                         continue;
1673                 }
1674
1675                 /* bit 1: allow individual 875 configuration */
1676                 pci_read_config_byte(memc, 0x44, &tmp);
1677                 if ((tmp & 0x2) == 0) {
1678                         tmp |= 0x2;
1679                         pci_write_config_byte(memc, 0x44, tmp);
1680                 }
1681
1682                 /* bit 2: drive individual 875 interrupts to the bus */
1683                 pci_read_config_byte(memc, 0x45, &tmp);
1684                 if ((tmp & 0x4) == 0) {
1685                         tmp |= 0x4;
1686                         pci_write_config_byte(memc, 0x45, tmp);
1687                 }
1688
1689                 pci_dev_put(memc);
1690                 break;
1691         }
1692
1693         pci_read_config_byte(pdev, 0x84, &tmp);
1694         sym_dev->host_id = tmp;
1695 }
1696
1697 /*
1698  *  Called before unloading the module.
1699  *  Detach the host.
1700  *  We have to free resources and halt the NCR chip.
1701  */
1702 static int sym_detach(struct Scsi_Host *shost, struct pci_dev *pdev)
1703 {
1704         struct sym_hcb *np = sym_get_hcb(shost);
1705         printk("%s: detaching ...\n", sym_name(np));
1706
1707         del_timer_sync(&np->s.timer);
1708
1709         /*
1710          * Reset NCR chip.
1711          * We should use sym_soft_reset(), but we don't want to do
1712          * so, since we may not be safe if interrupts occur.
1713          */
1714         printk("%s: resetting chip\n", sym_name(np));
1715         OUTB(np, nc_istat, SRST);
1716         INB(np, nc_mbox1);
1717         udelay(10);
1718         OUTB(np, nc_istat, 0);
1719
1720         sym_free_resources(np, pdev, 1);
1721         scsi_host_put(shost);
1722
1723         return 1;
1724 }
1725
1726 /*
1727  * Driver host template.
1728  */
1729 static struct scsi_host_template sym2_template = {
1730         .module                 = THIS_MODULE,
1731         .name                   = "sym53c8xx",
1732         .info                   = sym53c8xx_info,
1733         .queuecommand           = sym53c8xx_queue_command,
1734         .slave_alloc            = sym53c8xx_slave_alloc,
1735         .slave_configure        = sym53c8xx_slave_configure,
1736         .slave_destroy          = sym53c8xx_slave_destroy,
1737         .eh_abort_handler       = sym53c8xx_eh_abort_handler,
1738         .eh_device_reset_handler = sym53c8xx_eh_device_reset_handler,
1739         .eh_bus_reset_handler   = sym53c8xx_eh_bus_reset_handler,
1740         .eh_host_reset_handler  = sym53c8xx_eh_host_reset_handler,
1741         .this_id                = 7,
1742         .use_clustering         = ENABLE_CLUSTERING,
1743         .max_sectors            = 0xFFFF,
1744 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
1745         .proc_info              = sym53c8xx_proc_info,
1746         .proc_name              = NAME53C8XX,
1747 #endif
1748 };
1749
1750 static int attach_count;
1751
1752 static int sym2_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
1753 {
1754         struct sym_device sym_dev;
1755         struct sym_nvram nvram;
1756         struct Scsi_Host *shost;
1757         int do_iounmap = 0;
1758         int do_disable_device = 1;
1759
1760         memset(&sym_dev, 0, sizeof(sym_dev));
1761         memset(&nvram, 0, sizeof(nvram));
1762         sym_dev.pdev = pdev;
1763         sym_dev.host_id = SYM_SETUP_HOST_ID;
1764
1765         if (pci_enable_device(pdev))
1766                 goto leave;
1767
1768         pci_set_master(pdev);
1769
1770         if (pci_request_regions(pdev, NAME53C8XX))
1771                 goto disable;
1772
1773         if (sym_check_supported(&sym_dev))
1774                 goto free;
1775
1776         if (sym_iomap_device(&sym_dev))
1777                 goto free;
1778         do_iounmap = 1;
1779
1780         if (sym_check_raid(&sym_dev)) {
1781                 do_disable_device = 0;  /* Don't disable the device */
1782                 goto free;
1783         }
1784
1785         if (sym_set_workarounds(&sym_dev))
1786                 goto free;
1787
1788         sym_config_pqs(pdev, &sym_dev);
1789
1790         sym_get_nvram(&sym_dev, &nvram);
1791
1792         do_iounmap = 0; /* Don't sym_iounmap_device() after sym_attach(). */
1793         shost = sym_attach(&sym2_template, attach_count, &sym_dev);
1794         if (!shost)
1795                 goto free;
1796
1797         if (scsi_add_host(shost, &pdev->dev))
1798                 goto detach;
1799         scsi_scan_host(shost);
1800
1801         attach_count++;
1802
1803         return 0;
1804
1805  detach:
1806         sym_detach(pci_get_drvdata(pdev), pdev);
1807  free:
1808         if (do_iounmap)
1809                 sym_iounmap_device(&sym_dev);
1810         pci_release_regions(pdev);
1811  disable:
1812         if (do_disable_device)
1813                 pci_disable_device(pdev);
1814  leave:
1815         return -ENODEV;
1816 }
1817
1818 static void sym2_remove(struct pci_dev *pdev)
1819 {
1820         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1821
1822         scsi_remove_host(shost);
1823         sym_detach(shost, pdev);
1824         pci_release_regions(pdev);
1825         pci_disable_device(pdev);
1826
1827         attach_count--;
1828 }
1829
1830 /**
1831  * sym2_io_error_detected() - called when PCI error is detected
1832  * @pdev: pointer to PCI device
1833  * @state: current state of the PCI slot
1834  */
1835 static pci_ers_result_t sym2_io_error_detected(struct pci_dev *pdev,
1836                                          enum pci_channel_state state)
1837 {
1838         /* If slot is permanently frozen, turn everything off */
1839         if (state == pci_channel_io_perm_failure) {
1840                 sym2_remove(pdev);
1841                 return PCI_ERS_RESULT_DISCONNECT;
1842         }
1843
1844         disable_irq(pdev->irq);
1845         pci_disable_device(pdev);
1846
1847         /* Request that MMIO be enabled, so register dump can be taken. */
1848         return PCI_ERS_RESULT_CAN_RECOVER;
1849 }
1850
1851 /**
1852  * sym2_io_slot_dump - Enable MMIO and dump debug registers
1853  * @pdev: pointer to PCI device
1854  */
1855 static pci_ers_result_t sym2_io_slot_dump(struct pci_dev *pdev)
1856 {
1857         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1858
1859         sym_dump_registers(shost);
1860
1861         /* Request a slot reset. */
1862         return PCI_ERS_RESULT_NEED_RESET;
1863 }
1864
1865 /**
1866  * sym2_reset_workarounds - hardware-specific work-arounds
1867  *
1868  * This routine is similar to sym_set_workarounds(), except
1869  * that, at this point, we already know that the device was
1870  * successfully initialized at least once before, and so most
1871  * of the steps taken there are un-needed here.
1872  */
1873 static void sym2_reset_workarounds(struct pci_dev *pdev)
1874 {
1875         u_short status_reg;
1876         struct sym_chip *chip;
1877
1878         chip = sym_lookup_chip_table(pdev->device, pdev->revision);
1879
1880         /* Work around for errant bit in 895A, in a fashion
1881          * similar to what is done in sym_set_workarounds().
1882          */
1883         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1884         if (!(chip->features & FE_66MHZ) && (status_reg & PCI_STATUS_66MHZ)) {
1885                 status_reg = PCI_STATUS_66MHZ;
1886                 pci_write_config_word(pdev, PCI_STATUS, status_reg);
1887                 pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1888         }
1889 }
1890
1891 /**
1892  * sym2_io_slot_reset() - called when the pci bus has been reset.
1893  * @pdev: pointer to PCI device
1894  *
1895  * Restart the card from scratch.
1896  */
1897 static pci_ers_result_t sym2_io_slot_reset(struct pci_dev *pdev)
1898 {
1899         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1900         struct sym_hcb *np = sym_get_hcb(shost);
1901
1902         printk(KERN_INFO "%s: recovering from a PCI slot reset\n",
1903                   sym_name(np));
1904
1905         if (pci_enable_device(pdev)) {
1906                 printk(KERN_ERR "%s: Unable to enable after PCI reset\n",
1907                         sym_name(np));
1908                 return PCI_ERS_RESULT_DISCONNECT;
1909         }
1910
1911         pci_set_master(pdev);
1912         enable_irq(pdev->irq);
1913
1914         /* If the chip can do Memory Write Invalidate, enable it */
1915         if (np->features & FE_WRIE) {
1916                 if (pci_set_mwi(pdev))
1917                         return PCI_ERS_RESULT_DISCONNECT;
1918         }
1919
1920         /* Perform work-arounds, analogous to sym_set_workarounds() */
1921         sym2_reset_workarounds(pdev);
1922
1923         /* Perform host reset only on one instance of the card */
1924         if (PCI_FUNC(pdev->devfn) == 0) {
1925                 if (sym_reset_scsi_bus(np, 0)) {
1926                         printk(KERN_ERR "%s: Unable to reset scsi host\n",
1927                                 sym_name(np));
1928                         return PCI_ERS_RESULT_DISCONNECT;
1929                 }
1930                 sym_start_up(shost, 1);
1931         }
1932
1933         return PCI_ERS_RESULT_RECOVERED;
1934 }
1935
1936 /**
1937  * sym2_io_resume() - resume normal ops after PCI reset
1938  * @pdev: pointer to PCI device
1939  *
1940  * Called when the error recovery driver tells us that its
1941  * OK to resume normal operation. Use completion to allow
1942  * halted scsi ops to resume.
1943  */
1944 static void sym2_io_resume(struct pci_dev *pdev)
1945 {
1946         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1947         struct sym_data *sym_data = shost_priv(shost);
1948
1949         spin_lock_irq(shost->host_lock);
1950         if (sym_data->io_reset)
1951                 complete_all(sym_data->io_reset);
1952         spin_unlock_irq(shost->host_lock);
1953 }
1954
1955 static void sym2_get_signalling(struct Scsi_Host *shost)
1956 {
1957         struct sym_hcb *np = sym_get_hcb(shost);
1958         enum spi_signal_type type;
1959
1960         switch (np->scsi_mode) {
1961         case SMODE_SE:
1962                 type = SPI_SIGNAL_SE;
1963                 break;
1964         case SMODE_LVD:
1965                 type = SPI_SIGNAL_LVD;
1966                 break;
1967         case SMODE_HVD:
1968                 type = SPI_SIGNAL_HVD;
1969                 break;
1970         default:
1971                 type = SPI_SIGNAL_UNKNOWN;
1972                 break;
1973         }
1974         spi_signalling(shost) = type;
1975 }
1976
1977 static void sym2_set_offset(struct scsi_target *starget, int offset)
1978 {
1979         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1980         struct sym_hcb *np = sym_get_hcb(shost);
1981         struct sym_tcb *tp = &np->target[starget->id];
1982
1983         tp->tgoal.offset = offset;
1984         tp->tgoal.check_nego = 1;
1985 }
1986
1987 static void sym2_set_period(struct scsi_target *starget, int period)
1988 {
1989         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1990         struct sym_hcb *np = sym_get_hcb(shost);
1991         struct sym_tcb *tp = &np->target[starget->id];
1992
1993         /* have to have DT for these transfers, but DT will also
1994          * set width, so check that this is allowed */
1995         if (period <= np->minsync && spi_width(starget))
1996                 tp->tgoal.dt = 1;
1997
1998         tp->tgoal.period = period;
1999         tp->tgoal.check_nego = 1;
2000 }
2001
2002 static void sym2_set_width(struct scsi_target *starget, int width)
2003 {
2004         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2005         struct sym_hcb *np = sym_get_hcb(shost);
2006         struct sym_tcb *tp = &np->target[starget->id];
2007
2008         /* It is illegal to have DT set on narrow transfers.  If DT is
2009          * clear, we must also clear IU and QAS.  */
2010         if (width == 0)
2011                 tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
2012
2013         tp->tgoal.width = width;
2014         tp->tgoal.check_nego = 1;
2015 }
2016
2017 static void sym2_set_dt(struct scsi_target *starget, int dt)
2018 {
2019         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2020         struct sym_hcb *np = sym_get_hcb(shost);
2021         struct sym_tcb *tp = &np->target[starget->id];
2022
2023         /* We must clear QAS and IU if DT is clear */
2024         if (dt)
2025                 tp->tgoal.dt = 1;
2026         else
2027                 tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
2028         tp->tgoal.check_nego = 1;
2029 }
2030
2031 #if 0
2032 static void sym2_set_iu(struct scsi_target *starget, int iu)
2033 {
2034         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2035         struct sym_hcb *np = sym_get_hcb(shost);
2036         struct sym_tcb *tp = &np->target[starget->id];
2037
2038         if (iu)
2039                 tp->tgoal.iu = tp->tgoal.dt = 1;
2040         else
2041                 tp->tgoal.iu = 0;
2042         tp->tgoal.check_nego = 1;
2043 }
2044
2045 static void sym2_set_qas(struct scsi_target *starget, int qas)
2046 {
2047         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2048         struct sym_hcb *np = sym_get_hcb(shost);
2049         struct sym_tcb *tp = &np->target[starget->id];
2050
2051         if (qas)
2052                 tp->tgoal.dt = tp->tgoal.qas = 1;
2053         else
2054                 tp->tgoal.qas = 0;
2055         tp->tgoal.check_nego = 1;
2056 }
2057 #endif
2058
2059 static struct spi_function_template sym2_transport_functions = {
2060         .set_offset     = sym2_set_offset,
2061         .show_offset    = 1,
2062         .set_period     = sym2_set_period,
2063         .show_period    = 1,
2064         .set_width      = sym2_set_width,
2065         .show_width     = 1,
2066         .set_dt         = sym2_set_dt,
2067         .show_dt        = 1,
2068 #if 0
2069         .set_iu         = sym2_set_iu,
2070         .show_iu        = 1,
2071         .set_qas        = sym2_set_qas,
2072         .show_qas       = 1,
2073 #endif
2074         .get_signalling = sym2_get_signalling,
2075 };
2076
2077 static struct pci_device_id sym2_id_table[] = {
2078         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C810,
2079           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2080         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C820,
2081           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2082         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C825,
2083           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2084         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C815,
2085           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2086         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C810AP,
2087           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2088         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C860,
2089           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2090         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1510,
2091           PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_SCSI<<8,  0xffff00, 0UL },
2092         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C896,
2093           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2094         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C895,
2095           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2096         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C885,
2097           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2098         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875,
2099           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2100         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C1510,
2101           PCI_ANY_ID, PCI_ANY_ID,  PCI_CLASS_STORAGE_SCSI<<8,  0xffff00, 0UL }, /* new */
2102         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C895A,
2103           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2104         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C875A,
2105           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2106         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_33,
2107           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2108         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_66,
2109           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2110         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875J,
2111           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2112         { 0, }
2113 };
2114
2115 MODULE_DEVICE_TABLE(pci, sym2_id_table);
2116
2117 static const struct pci_error_handlers sym2_err_handler = {
2118         .error_detected = sym2_io_error_detected,
2119         .mmio_enabled   = sym2_io_slot_dump,
2120         .slot_reset     = sym2_io_slot_reset,
2121         .resume         = sym2_io_resume,
2122 };
2123
2124 static struct pci_driver sym2_driver = {
2125         .name           = NAME53C8XX,
2126         .id_table       = sym2_id_table,
2127         .probe          = sym2_probe,
2128         .remove         = sym2_remove,
2129         .err_handler    = &sym2_err_handler,
2130 };
2131
2132 static int __init sym2_init(void)
2133 {
2134         int error;
2135
2136         sym2_setup_params();
2137         sym2_transport_template = spi_attach_transport(&sym2_transport_functions);
2138         if (!sym2_transport_template)
2139                 return -ENODEV;
2140
2141         error = pci_register_driver(&sym2_driver);
2142         if (error)
2143                 spi_release_transport(sym2_transport_template);
2144         return error;
2145 }
2146
2147 static void __exit sym2_exit(void)
2148 {
2149         pci_unregister_driver(&sym2_driver);
2150         spi_release_transport(sym2_transport_template);
2151 }
2152
2153 module_init(sym2_init);
2154 module_exit(sym2_exit);