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         spin_lock_irqsave(np->s.host->host_lock, flags);
 843
 844         if (lp->busy_itlq || lp->busy_itl) {
 845                 /*
 846                  * This really shouldn't happen, but we can't return an error
 847                  * so let's try to stop all on-going I/O.
 848                  */
 849                 starget_printk(KERN_WARNING, tp->starget,
 850                                "Removing busy LCB (%d)\n", sdev->lun);
 851                 sym_reset_scsi_bus(np, 1);
 852         }
 853
 854         if (sym_free_lcb(np, sdev->id, sdev->lun) == 0) {
 855                 /*
 856                  * It was the last unit for this target.
 857                  */
 858                 tp->head.sval        = 0;
 859                 tp->head.wval        = np->rv_scntl3;
 860                 tp->head.uval        = 0;
 861                 tp->tgoal.check_nego = 1;
 862                 tp->starget          = NULL;
 863         }
 864
 865         spin_unlock_irqrestore(np->s.host->host_lock, flags);
 866 }
 867
 868 /*
 869  *  Linux entry point for info() function
 870  */
 871 static const char *sym53c8xx_info (struct Scsi_Host *host)
 872 {
 873         return SYM_DRIVER_NAME;
 874 }
 875
 876
 877 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
 878 /*
 879  *  Proc file system stuff
 880  *
 881  *  A read operation returns adapter information.
 882  *  A write operation is a control command.
 883  *  The string is parsed in the driver code and the command is passed
 884  *  to the sym_usercmd() function.
 885  */
 886
 887 #ifdef SYM_LINUX_USER_COMMAND_SUPPORT
 888
 889 struct  sym_usrcmd {
 890         u_long  target;
 891         u_long  lun;
 892         u_long  data;
 893         u_long  cmd;
 894 };
 895
 896 #define UC_SETSYNC      10
 897 #define UC_SETTAGS      11
 898 #define UC_SETDEBUG     12
 899 #define UC_SETWIDE      14
 900 #define UC_SETFLAG      15
 901 #define UC_SETVERBOSE   17
 902 #define UC_RESETDEV     18
 903 #define UC_CLEARDEV     19
 904
 905 static void sym_exec_user_command (struct sym_hcb *np, struct sym_usrcmd *uc)
 906 {
 907         struct sym_tcb *tp;
 908         int t, l;
 909
 910         switch (uc->cmd) {
 911         case 0: return;
 912
 913 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
 914         case UC_SETDEBUG:
 915                 sym_debug_flags = uc->data;
 916                 break;
 917 #endif
 918         case UC_SETVERBOSE:
 919                 np->verbose = uc->data;
 920                 break;
 921         default:
 922                 /*
 923                  * We assume that other commands apply to targets.
 924                  * This should always be the case and avoid the below
 925                  * 4 lines to be repeated 6 times.
 926                  */
 927                 for (t = 0; t < SYM_CONF_MAX_TARGET; t++) {
 928                         if (!((uc->target >> t) & 1))
 929                                 continue;
 930                         tp = &np->target[t];
 931                         if (!tp->nlcb)
 932                                 continue;
 933
 934                         switch (uc->cmd) {
 935
 936                         case UC_SETSYNC:
 937                                 if (!uc->data || uc->data >= 255) {
 938                                         tp->tgoal.iu = tp->tgoal.dt =
 939                                                 tp->tgoal.qas = 0;
 940                                         tp->tgoal.offset = 0;
 941                                 } else if (uc->data <= 9 && np->minsync_dt) {
 942                                         if (uc->data < np->minsync_dt)
 943                                                 uc->data = np->minsync_dt;
 944                                         tp->tgoal.iu = tp->tgoal.dt =
 945                                                 tp->tgoal.qas = 1;
 946                                         tp->tgoal.width = 1;
 947                                         tp->tgoal.period = uc->data;
 948                                         tp->tgoal.offset = np->maxoffs_dt;
 949                                 } else {
 950                                         if (uc->data < np->minsync)
 951                                                 uc->data = np->minsync;
 952                                         tp->tgoal.iu = tp->tgoal.dt =
 953                                                 tp->tgoal.qas = 0;
 954                                         tp->tgoal.period = uc->data;
 955                                         tp->tgoal.offset = np->maxoffs;
 956                                 }
 957                                 tp->tgoal.check_nego = 1;
 958                                 break;
 959                         case UC_SETWIDE:
 960                                 tp->tgoal.width = uc->data ? 1 : 0;
 961                                 tp->tgoal.check_nego = 1;
 962                                 break;
 963                         case UC_SETTAGS:
 964                                 for (l = 0; l < SYM_CONF_MAX_LUN; l++)
 965                                         sym_tune_dev_queuing(tp, l, uc->data);
 966                                 break;
 967                         case UC_RESETDEV:
 968                                 tp->to_reset = 1;
 969                                 np->istat_sem = SEM;
 970                                 OUTB(np, nc_istat, SIGP|SEM);
 971                                 break;
 972                         case UC_CLEARDEV:
 973                                 for (l = 0; l < SYM_CONF_MAX_LUN; l++) {
 974                                         struct sym_lcb *lp = sym_lp(tp, l);
 975                                         if (lp) lp->to_clear = 1;
 976                                 }
 977                                 np->istat_sem = SEM;
 978                                 OUTB(np, nc_istat, SIGP|SEM);
 979                                 break;
 980                         case UC_SETFLAG:
 981                                 tp->usrflags = uc->data;
 982                                 break;
 983                         }
 984                 }
 985                 break;
 986         }
 987 }
 988
 989 static int sym_skip_spaces(char *ptr, int len)
 990 {
 991         int cnt, c;
 992
 993         for (cnt = len; cnt > 0 && (c = *ptr++) && isspace(c); cnt--);
 994
 995         return (len - cnt);
 996 }
 997
 998 static int get_int_arg(char *ptr, int len, u_long *pv)
 999 {
1000         char *end;
1001
1002         *pv = simple_strtoul(ptr, &end, 10);
1003         return (end - ptr);
1004 }
1005
1006 static int is_keyword(char *ptr, int len, char *verb)
1007 {
1008         int verb_len = strlen(verb);
1009
1010         if (len >= verb_len && !memcmp(verb, ptr, verb_len))
1011                 return verb_len;
1012         else
1013                 return 0;
1014 }
1015
1016 #define SKIP_SPACES(ptr, len)                                           \
1017         if ((arg_len = sym_skip_spaces(ptr, len)) < 1)                  \
1018                 return -EINVAL;                                         \
1019         ptr += arg_len; len -= arg_len;
1020
1021 #define GET_INT_ARG(ptr, len, v)                                        \
1022         if (!(arg_len = get_int_arg(ptr, len, &(v))))                   \
1023                 return -EINVAL;                                         \
1024         ptr += arg_len; len -= arg_len;
1025
1026
1027 /*
1028  * Parse a control command
1029  */
1030
1031 static int sym_user_command(struct Scsi_Host *shost, char *buffer, int length)
1032 {
1033         struct sym_hcb *np = sym_get_hcb(shost);
1034         char *ptr       = buffer;
1035         int len         = length;
1036         struct sym_usrcmd cmd, *uc = &cmd;
1037         int             arg_len;
1038         u_long          target;
1039
1040         memset(uc, 0, sizeof(*uc));
1041
1042         if (len > 0 && ptr[len-1] == '\n')
1043                 --len;
1044
1045         if      ((arg_len = is_keyword(ptr, len, "setsync")) != 0)
1046                 uc->cmd = UC_SETSYNC;
1047         else if ((arg_len = is_keyword(ptr, len, "settags")) != 0)
1048                 uc->cmd = UC_SETTAGS;
1049         else if ((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
1050                 uc->cmd = UC_SETVERBOSE;
1051         else if ((arg_len = is_keyword(ptr, len, "setwide")) != 0)
1052                 uc->cmd = UC_SETWIDE;
1053 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1054         else if ((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
1055                 uc->cmd = UC_SETDEBUG;
1056 #endif
1057         else if ((arg_len = is_keyword(ptr, len, "setflag")) != 0)
1058                 uc->cmd = UC_SETFLAG;
1059         else if ((arg_len = is_keyword(ptr, len, "resetdev")) != 0)
1060                 uc->cmd = UC_RESETDEV;
1061         else if ((arg_len = is_keyword(ptr, len, "cleardev")) != 0)
1062                 uc->cmd = UC_CLEARDEV;
1063         else
1064                 arg_len = 0;
1065
1066 #ifdef DEBUG_PROC_INFO
1067 printk("sym_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
1068 #endif
1069
1070         if (!arg_len)
1071                 return -EINVAL;
1072         ptr += arg_len; len -= arg_len;
1073
1074         switch(uc->cmd) {
1075         case UC_SETSYNC:
1076         case UC_SETTAGS:
1077         case UC_SETWIDE:
1078         case UC_SETFLAG:
1079         case UC_RESETDEV:
1080         case UC_CLEARDEV:
1081                 SKIP_SPACES(ptr, len);
1082                 if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
1083                         ptr += arg_len; len -= arg_len;
1084                         uc->target = ~0;
1085                 } else {
1086                         GET_INT_ARG(ptr, len, target);
1087                         uc->target = (1<<target);
1088 #ifdef DEBUG_PROC_INFO
1089 printk("sym_user_command: target=%ld\n", target);
1090 #endif
1091                 }
1092                 break;
1093         }
1094
1095         switch(uc->cmd) {
1096         case UC_SETVERBOSE:
1097         case UC_SETSYNC:
1098         case UC_SETTAGS:
1099         case UC_SETWIDE:
1100                 SKIP_SPACES(ptr, len);
1101                 GET_INT_ARG(ptr, len, uc->data);
1102 #ifdef DEBUG_PROC_INFO
1103 printk("sym_user_command: data=%ld\n", uc->data);
1104 #endif
1105                 break;
1106 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1107         case UC_SETDEBUG:
1108                 while (len > 0) {
1109                         SKIP_SPACES(ptr, len);
1110                         if      ((arg_len = is_keyword(ptr, len, "alloc")))
1111                                 uc->data |= DEBUG_ALLOC;
1112                         else if ((arg_len = is_keyword(ptr, len, "phase")))
1113                                 uc->data |= DEBUG_PHASE;
1114                         else if ((arg_len = is_keyword(ptr, len, "queue")))
1115                                 uc->data |= DEBUG_QUEUE;
1116                         else if ((arg_len = is_keyword(ptr, len, "result")))
1117                                 uc->data |= DEBUG_RESULT;
1118                         else if ((arg_len = is_keyword(ptr, len, "scatter")))
1119                                 uc->data |= DEBUG_SCATTER;
1120                         else if ((arg_len = is_keyword(ptr, len, "script")))
1121                                 uc->data |= DEBUG_SCRIPT;
1122                         else if ((arg_len = is_keyword(ptr, len, "tiny")))
1123                                 uc->data |= DEBUG_TINY;
1124                         else if ((arg_len = is_keyword(ptr, len, "timing")))
1125                                 uc->data |= DEBUG_TIMING;
1126                         else if ((arg_len = is_keyword(ptr, len, "nego")))
1127                                 uc->data |= DEBUG_NEGO;
1128                         else if ((arg_len = is_keyword(ptr, len, "tags")))
1129                                 uc->data |= DEBUG_TAGS;
1130                         else if ((arg_len = is_keyword(ptr, len, "pointer")))
1131                                 uc->data |= DEBUG_POINTER;
1132                         else
1133                                 return -EINVAL;
1134                         ptr += arg_len; len -= arg_len;
1135                 }
1136 #ifdef DEBUG_PROC_INFO
1137 printk("sym_user_command: data=%ld\n", uc->data);
1138 #endif
1139                 break;
1140 #endif /* SYM_LINUX_DEBUG_CONTROL_SUPPORT */
1141         case UC_SETFLAG:
1142                 while (len > 0) {
1143                         SKIP_SPACES(ptr, len);
1144                         if      ((arg_len = is_keyword(ptr, len, "no_disc")))
1145                                 uc->data &= ~SYM_DISC_ENABLED;
1146                         else
1147                                 return -EINVAL;
1148                         ptr += arg_len; len -= arg_len;
1149                 }
1150                 break;
1151         default:
1152                 break;
1153         }
1154
1155         if (len)
1156                 return -EINVAL;
1157         else {
1158                 unsigned long flags;
1159
1160                 spin_lock_irqsave(shost->host_lock, flags);
1161                 sym_exec_user_command(np, uc);
1162                 spin_unlock_irqrestore(shost->host_lock, flags);
1163         }
1164         return length;
1165 }
1166
1167 #endif  /* SYM_LINUX_USER_COMMAND_SUPPORT */
1168
1169
1170 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1171 /*
1172  *  Informations through the proc file system.
1173  */
1174 struct info_str {
1175         char *buffer;
1176         int length;
1177         int offset;
1178         int pos;
1179 };
1180
1181 static void copy_mem_info(struct info_str *info, char *data, int len)
1182 {
1183         if (info->pos + len > info->length)
1184                 len = info->length - info->pos;
1185
1186         if (info->pos + len < info->offset) {
1187                 info->pos += len;
1188                 return;
1189         }
1190         if (info->pos < info->offset) {
1191                 data += (info->offset - info->pos);
1192                 len  -= (info->offset - info->pos);
1193         }
1194
1195         if (len > 0) {
1196                 memcpy(info->buffer + info->pos, data, len);
1197                 info->pos += len;
1198         }
1199 }
1200
1201 static int copy_info(struct info_str *info, char *fmt, ...)
1202 {
1203         va_list args;
1204         char buf[81];
1205         int len;
1206
1207         va_start(args, fmt);
1208         len = vsprintf(buf, fmt, args);
1209         va_end(args);
1210
1211         copy_mem_info(info, buf, len);
1212         return len;
1213 }
1214
1215 /*
1216  *  Copy formatted information into the input buffer.
1217  */
1218 static int sym_host_info(struct Scsi_Host *shost, char *ptr, off_t offset, int len)
1219 {
1220         struct sym_data *sym_data = shost_priv(shost);
1221         struct pci_dev *pdev = sym_data->pdev;
1222         struct sym_hcb *np = sym_data->ncb;
1223         struct info_str info;
1224
1225         info.buffer     = ptr;
1226         info.length     = len;
1227         info.offset     = offset;
1228         info.pos        = 0;
1229
1230         copy_info(&info, "Chip " NAME53C "%s, device id 0x%x, "
1231                          "revision id 0x%x\n", np->s.chip_name,
1232                          pdev->device, pdev->revision);
1233         copy_info(&info, "At PCI address %s, IRQ %u\n",
1234                          pci_name(pdev), pdev->irq);
1235         copy_info(&info, "Min. period factor %d, %s SCSI BUS%s\n",
1236                          (int) (np->minsync_dt ? np->minsync_dt : np->minsync),
1237                          np->maxwide ? "Wide" : "Narrow",
1238                          np->minsync_dt ? ", DT capable" : "");
1239
1240         copy_info(&info, "Max. started commands %d, "
1241                          "max. commands per LUN %d\n",
1242                          SYM_CONF_MAX_START, SYM_CONF_MAX_TAG);
1243
1244         return info.pos > info.offset? info.pos - info.offset : 0;
1245 }
1246 #endif /* SYM_LINUX_USER_INFO_SUPPORT */
1247
1248 /*
1249  *  Entry point of the scsi proc fs of the driver.
1250  *  - func = 0 means read  (returns adapter infos)
1251  *  - func = 1 means write (not yet merget from sym53c8xx)
1252  */
1253 static int sym53c8xx_proc_info(struct Scsi_Host *shost, char *buffer,
1254                         char **start, off_t offset, int length, int func)
1255 {
1256         int retv;
1257
1258         if (func) {
1259 #ifdef  SYM_LINUX_USER_COMMAND_SUPPORT
1260                 retv = sym_user_command(shost, buffer, length);
1261 #else
1262                 retv = -EINVAL;
1263 #endif
1264         } else {
1265                 if (start)
1266                         *start = buffer;
1267 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1268                 retv = sym_host_info(shost, buffer, offset, length);
1269 #else
1270                 retv = -EINVAL;
1271 #endif
1272         }
1273
1274         return retv;
1275 }
1276 #endif /* SYM_LINUX_PROC_INFO_SUPPORT */
1277
1278 /*
1279  * Free resources claimed by sym_iomap_device().  Note that
1280  * sym_free_resources() should be used instead of this function after calling
1281  * sym_attach().
1282  */
1283 static void __devinit
1284 sym_iounmap_device(struct sym_device *device)
1285 {
1286         if (device->s.ioaddr)
1287                 pci_iounmap(device->pdev, device->s.ioaddr);
1288         if (device->s.ramaddr)
1289                 pci_iounmap(device->pdev, device->s.ramaddr);
1290 }
1291
1292 /*
1293  *      Free controller resources.
1294  */
1295 static void sym_free_resources(struct sym_hcb *np, struct pci_dev *pdev,
1296                 int do_free_irq)
1297 {
1298         /*
1299          *  Free O/S specific resources.
1300          */
1301         if (do_free_irq)
1302                 free_irq(pdev->irq, np->s.host);
1303         if (np->s.ioaddr)
1304                 pci_iounmap(pdev, np->s.ioaddr);
1305         if (np->s.ramaddr)
1306                 pci_iounmap(pdev, np->s.ramaddr);
1307         /*
1308          *  Free O/S independent resources.
1309          */
1310         sym_hcb_free(np);
1311
1312         sym_mfree_dma(np, sizeof(*np), "HCB");
1313 }
1314
1315 /*
1316  *  Host attach and initialisations.
1317  *
1318  *  Allocate host data and ncb structure.
1319  *  Remap MMIO region.
1320  *  Do chip initialization.
1321  *  If all is OK, install interrupt handling and
1322  *  start the timer daemon.
1323  */
1324 static struct Scsi_Host * __devinit sym_attach(struct scsi_host_template *tpnt,
1325                 int unit, struct sym_device *dev)
1326 {
1327         struct sym_data *sym_data;
1328         struct sym_hcb *np = NULL;
1329         struct Scsi_Host *shost = NULL;
1330         struct pci_dev *pdev = dev->pdev;
1331         unsigned long flags;
1332         struct sym_fw *fw;
1333         int do_free_irq = 0;
1334
1335         printk(KERN_INFO "sym%d: <%s> rev 0x%x at pci %s irq %u\n",
1336                 unit, dev->chip.name, pdev->revision, pci_name(pdev),
1337                 pdev->irq);
1338
1339         /*
1340          *  Get the firmware for this chip.
1341          */
1342         fw = sym_find_firmware(&dev->chip);
1343         if (!fw)
1344                 goto attach_failed;
1345
1346         shost = scsi_host_alloc(tpnt, sizeof(*sym_data));
1347         if (!shost)
1348                 goto attach_failed;
1349         sym_data = shost_priv(shost);
1350
1351         /*
1352          *  Allocate immediately the host control block,
1353          *  since we are only expecting to succeed. :)
1354          *  We keep track in the HCB of all the resources that
1355          *  are to be released on error.
1356          */
1357         np = __sym_calloc_dma(&pdev->dev, sizeof(*np), "HCB");
1358         if (!np)
1359                 goto attach_failed;
1360         np->bus_dmat = &pdev->dev; /* Result in 1 DMA pool per HBA */
1361         sym_data->ncb = np;
1362         sym_data->pdev = pdev;
1363         np->s.host = shost;
1364
1365         pci_set_drvdata(pdev, shost);
1366
1367         /*
1368          *  Copy some useful infos to the HCB.
1369          */
1370         np->hcb_ba      = vtobus(np);
1371         np->verbose     = sym_driver_setup.verbose;
1372         np->s.unit      = unit;
1373         np->features    = dev->chip.features;
1374         np->clock_divn  = dev->chip.nr_divisor;
1375         np->maxoffs     = dev->chip.offset_max;
1376         np->maxburst    = dev->chip.burst_max;
1377         np->myaddr      = dev->host_id;
1378         np->mmio_ba     = (u32)dev->mmio_base;
1379         np->ram_ba      = (u32)dev->ram_base;
1380         np->s.ioaddr    = dev->s.ioaddr;
1381         np->s.ramaddr   = dev->s.ramaddr;
1382
1383         /*
1384          *  Edit its name.
1385          */
1386         strlcpy(np->s.chip_name, dev->chip.name, sizeof(np->s.chip_name));
1387         sprintf(np->s.inst_name, "sym%d", np->s.unit);
1388
1389         if ((SYM_CONF_DMA_ADDRESSING_MODE > 0) && (np->features & FE_DAC) &&
1390                         !pci_set_dma_mask(pdev, DMA_DAC_MASK)) {
1391                 set_dac(np);
1392         } else if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
1393                 printf_warning("%s: No suitable DMA available\n", sym_name(np));
1394                 goto attach_failed;
1395         }
1396
1397         if (sym_hcb_attach(shost, fw, dev->nvram))
1398                 goto attach_failed;
1399
1400         /*
1401          *  Install the interrupt handler.
1402          *  If we synchonize the C code with SCRIPTS on interrupt,
1403          *  we do not want to share the INTR line at all.
1404          */
1405         if (request_irq(pdev->irq, sym53c8xx_intr, IRQF_SHARED, NAME53C8XX,
1406                         shost)) {
1407                 printf_err("%s: request irq %u failure\n",
1408                         sym_name(np), pdev->irq);
1409                 goto attach_failed;
1410         }
1411         do_free_irq = 1;
1412
1413         /*
1414          *  After SCSI devices have been opened, we cannot
1415          *  reset the bus safely, so we do it here.
1416          */
1417         spin_lock_irqsave(shost->host_lock, flags);
1418         if (sym_reset_scsi_bus(np, 0))
1419                 goto reset_failed;
1420
1421         /*
1422          *  Start the SCRIPTS.
1423          */
1424         sym_start_up(shost, 1);
1425
1426         /*
1427          *  Start the timer daemon
1428          */
1429         init_timer(&np->s.timer);
1430         np->s.timer.data     = (unsigned long) np;
1431         np->s.timer.function = sym53c8xx_timer;
1432         np->s.lasttime=0;
1433         sym_timer (np);
1434
1435         /*
1436          *  Fill Linux host instance structure
1437          *  and return success.
1438          */
1439         shost->max_channel      = 0;
1440         shost->this_id          = np->myaddr;
1441         shost->max_id           = np->maxwide ? 16 : 8;
1442         shost->max_lun          = SYM_CONF_MAX_LUN;
1443         shost->unique_id        = pci_resource_start(pdev, 0);
1444         shost->cmd_per_lun      = SYM_CONF_MAX_TAG;
1445         shost->can_queue        = (SYM_CONF_MAX_START-2);
1446         shost->sg_tablesize     = SYM_CONF_MAX_SG;
1447         shost->max_cmd_len      = 16;
1448         BUG_ON(sym2_transport_template == NULL);
1449         shost->transportt       = sym2_transport_template;
1450
1451         /* 53c896 rev 1 errata: DMA may not cross 16MB boundary */
1452         if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && pdev->revision < 2)
1453                 shost->dma_boundary = 0xFFFFFF;
1454
1455         spin_unlock_irqrestore(shost->host_lock, flags);
1456
1457         return shost;
1458
1459  reset_failed:
1460         printf_err("%s: FATAL ERROR: CHECK SCSI BUS - CABLES, "
1461                    "TERMINATION, DEVICE POWER etc.!\n", sym_name(np));
1462         spin_unlock_irqrestore(shost->host_lock, flags);
1463  attach_failed:
1464         printf_info("sym%d: giving up ...\n", unit);
1465         if (np)
1466                 sym_free_resources(np, pdev, do_free_irq);
1467         else
1468                 sym_iounmap_device(dev);
1469         if (shost)
1470                 scsi_host_put(shost);
1471
1472         return NULL;
1473  }
1474
1475
1476 /*
1477  *    Detect and try to read SYMBIOS and TEKRAM NVRAM.
1478  */
1479 #if SYM_CONF_NVRAM_SUPPORT
1480 static void __devinit sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1481 {
1482         devp->nvram = nvp;
1483         nvp->type = 0;
1484
1485         sym_read_nvram(devp, nvp);
1486 }
1487 #else
1488 static inline void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1489 {
1490 }
1491 #endif  /* SYM_CONF_NVRAM_SUPPORT */
1492
1493 static int __devinit sym_check_supported(struct sym_device *device)
1494 {
1495         struct sym_chip *chip;
1496         struct pci_dev *pdev = device->pdev;
1497         unsigned long io_port = pci_resource_start(pdev, 0);
1498         int i;
1499
1500         /*
1501          *  If user excluded this chip, do not initialize it.
1502          *  I hate this code so much.  Must kill it.
1503          */
1504         if (io_port) {
1505                 for (i = 0 ; i < 8 ; i++) {
1506                         if (sym_driver_setup.excludes[i] == io_port)
1507                                 return -ENODEV;
1508                 }
1509         }
1510
1511         /*
1512          * Check if the chip is supported.  Then copy the chip description
1513          * to our device structure so we can make it match the actual device
1514          * and options.
1515          */
1516         chip = sym_lookup_chip_table(pdev->device, pdev->revision);
1517         if (!chip) {
1518                 dev_info(&pdev->dev, "device not supported\n");
1519                 return -ENODEV;
1520         }
1521         memcpy(&device->chip, chip, sizeof(device->chip));
1522
1523         return 0;
1524 }
1525
1526 /*
1527  * Ignore Symbios chips controlled by various RAID controllers.
1528  * These controllers set value 0x52414944 at RAM end - 16.
1529  */
1530 static int __devinit sym_check_raid(struct sym_device *device)
1531 {
1532         unsigned int ram_size, ram_val;
1533
1534         if (!device->s.ramaddr)
1535                 return 0;
1536
1537         if (device->chip.features & FE_RAM8K)
1538                 ram_size = 8192;
1539         else
1540                 ram_size = 4096;
1541
1542         ram_val = readl(device->s.ramaddr + ram_size - 16);
1543         if (ram_val != 0x52414944)
1544                 return 0;
1545
1546         dev_info(&device->pdev->dev,
1547                         "not initializing, driven by RAID controller.\n");
1548         return -ENODEV;
1549 }
1550
1551 static int __devinit sym_set_workarounds(struct sym_device *device)
1552 {
1553         struct sym_chip *chip = &device->chip;
1554         struct pci_dev *pdev = device->pdev;
1555         u_short status_reg;
1556
1557         /*
1558          *  (ITEM 12 of a DEL about the 896 I haven't yet).
1559          *  We must ensure the chip will use WRITE AND INVALIDATE.
1560          *  The revision number limit is for now arbitrary.
1561          */
1562         if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && pdev->revision < 0x4) {
1563                 chip->features  |= (FE_WRIE | FE_CLSE);
1564         }
1565
1566         /* If the chip can do Memory Write Invalidate, enable it */
1567         if (chip->features & FE_WRIE) {
1568                 if (pci_set_mwi(pdev))
1569                         return -ENODEV;
1570         }
1571
1572         /*
1573          *  Work around for errant bit in 895A. The 66Mhz
1574          *  capable bit is set erroneously. Clear this bit.
1575          *  (Item 1 DEL 533)
1576          *
1577          *  Make sure Config space and Features agree.
1578          *
1579          *  Recall: writes are not normal to status register -
1580          *  write a 1 to clear and a 0 to leave unchanged.
1581          *  Can only reset bits.
1582          */
1583         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1584         if (chip->features & FE_66MHZ) {
1585                 if (!(status_reg & PCI_STATUS_66MHZ))
1586                         chip->features &= ~FE_66MHZ;
1587         } else {
1588                 if (status_reg & PCI_STATUS_66MHZ) {
1589                         status_reg = PCI_STATUS_66MHZ;
1590                         pci_write_config_word(pdev, PCI_STATUS, status_reg);
1591                         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1592                 }
1593         }
1594
1595         return 0;
1596 }
1597
1598 /*
1599  * Map HBA registers and on-chip SRAM (if present).
1600  */
1601 static int __devinit
1602 sym_iomap_device(struct sym_device *device)
1603 {
1604         struct pci_dev *pdev = device->pdev;
1605         struct pci_bus_region bus_addr;
1606         int i = 2;
1607
1608         pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[1]);
1609         device->mmio_base = bus_addr.start;
1610
1611         if (device->chip.features & FE_RAM) {
1612                 /*
1613                  * If the BAR is 64-bit, resource 2 will be occupied by the
1614                  * upper 32 bits
1615                  */
1616                 if (!pdev->resource[i].flags)
1617                         i++;
1618                 pcibios_resource_to_bus(pdev, &bus_addr, &pdev->resource[i]);
1619                 device->ram_base = bus_addr.start;
1620         }
1621
1622 #ifdef CONFIG_SCSI_SYM53C8XX_MMIO
1623         if (device->mmio_base)
1624                 device->s.ioaddr = pci_iomap(pdev, 1,
1625                                                 pci_resource_len(pdev, 1));
1626 #endif
1627         if (!device->s.ioaddr)
1628                 device->s.ioaddr = pci_iomap(pdev, 0,
1629                                                 pci_resource_len(pdev, 0));
1630         if (!device->s.ioaddr) {
1631                 dev_err(&pdev->dev, "could not map registers; giving up.\n");
1632                 return -EIO;
1633         }
1634         if (device->ram_base) {
1635                 device->s.ramaddr = pci_iomap(pdev, i,
1636                                                 pci_resource_len(pdev, i));
1637                 if (!device->s.ramaddr) {
1638                         dev_warn(&pdev->dev,
1639                                 "could not map SRAM; continuing anyway.\n");
1640                         device->ram_base = 0;
1641                 }
1642         }
1643
1644         return 0;
1645 }
1646
1647 /*
1648  * The NCR PQS and PDS cards are constructed as a DEC bridge
1649  * behind which sits a proprietary NCR memory controller and
1650  * either four or two 53c875s as separate devices.  We can tell
1651  * if an 875 is part of a PQS/PDS or not since if it is, it will
1652  * be on the same bus as the memory controller.  In its usual
1653  * mode of operation, the 875s are slaved to the memory
1654  * controller for all transfers.  To operate with the Linux
1655  * driver, the memory controller is disabled and the 875s
1656  * freed to function independently.  The only wrinkle is that
1657  * the preset SCSI ID (which may be zero) must be read in from
1658  * a special configuration space register of the 875.
1659  */
1660 static void sym_config_pqs(struct pci_dev *pdev, struct sym_device *sym_dev)
1661 {
1662         int slot;
1663         u8 tmp;
1664
1665         for (slot = 0; slot < 256; slot++) {
1666                 struct pci_dev *memc = pci_get_slot(pdev->bus, slot);
1667
1668                 if (!memc || memc->vendor != 0x101a || memc->device == 0x0009) {
1669                         pci_dev_put(memc);
1670                         continue;
1671                 }
1672
1673                 /* bit 1: allow individual 875 configuration */
1674                 pci_read_config_byte(memc, 0x44, &tmp);
1675                 if ((tmp & 0x2) == 0) {
1676                         tmp |= 0x2;
1677                         pci_write_config_byte(memc, 0x44, tmp);
1678                 }
1679
1680                 /* bit 2: drive individual 875 interrupts to the bus */
1681                 pci_read_config_byte(memc, 0x45, &tmp);
1682                 if ((tmp & 0x4) == 0) {
1683                         tmp |= 0x4;
1684                         pci_write_config_byte(memc, 0x45, tmp);
1685                 }
1686
1687                 pci_dev_put(memc);
1688                 break;
1689         }
1690
1691         pci_read_config_byte(pdev, 0x84, &tmp);
1692         sym_dev->host_id = tmp;
1693 }
1694
1695 /*
1696  *  Called before unloading the module.
1697  *  Detach the host.
1698  *  We have to free resources and halt the NCR chip.
1699  */
1700 static int sym_detach(struct Scsi_Host *shost, struct pci_dev *pdev)
1701 {
1702         struct sym_hcb *np = sym_get_hcb(shost);
1703         printk("%s: detaching ...\n", sym_name(np));
1704
1705         del_timer_sync(&np->s.timer);
1706
1707         /*
1708          * Reset NCR chip.
1709          * We should use sym_soft_reset(), but we don't want to do
1710          * so, since we may not be safe if interrupts occur.
1711          */
1712         printk("%s: resetting chip\n", sym_name(np));
1713         OUTB(np, nc_istat, SRST);
1714         INB(np, nc_mbox1);
1715         udelay(10);
1716         OUTB(np, nc_istat, 0);
1717
1718         sym_free_resources(np, pdev, 1);
1719         scsi_host_put(shost);
1720
1721         return 1;
1722 }
1723
1724 /*
1725  * Driver host template.
1726  */
1727 static struct scsi_host_template sym2_template = {
1728         .module                 = THIS_MODULE,
1729         .name                   = "sym53c8xx",
1730         .info                   = sym53c8xx_info,
1731         .queuecommand           = sym53c8xx_queue_command,
1732         .slave_alloc            = sym53c8xx_slave_alloc,
1733         .slave_configure        = sym53c8xx_slave_configure,
1734         .slave_destroy          = sym53c8xx_slave_destroy,
1735         .eh_abort_handler       = sym53c8xx_eh_abort_handler,
1736         .eh_device_reset_handler = sym53c8xx_eh_device_reset_handler,
1737         .eh_bus_reset_handler   = sym53c8xx_eh_bus_reset_handler,
1738         .eh_host_reset_handler  = sym53c8xx_eh_host_reset_handler,
1739         .this_id                = 7,
1740         .use_clustering         = ENABLE_CLUSTERING,
1741         .max_sectors            = 0xFFFF,
1742 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
1743         .proc_info              = sym53c8xx_proc_info,
1744         .proc_name              = NAME53C8XX,
1745 #endif
1746 };
1747
1748 static int attach_count;
1749
1750 static int __devinit sym2_probe(struct pci_dev *pdev,
1751                                 const struct pci_device_id *ent)
1752 {
1753         struct sym_device sym_dev;
1754         struct sym_nvram nvram;
1755         struct Scsi_Host *shost;
1756         int do_iounmap = 0;
1757         int do_disable_device = 1;
1758
1759         memset(&sym_dev, 0, sizeof(sym_dev));
1760         memset(&nvram, 0, sizeof(nvram));
1761         sym_dev.pdev = pdev;
1762         sym_dev.host_id = SYM_SETUP_HOST_ID;
1763
1764         if (pci_enable_device(pdev))
1765                 goto leave;
1766
1767         pci_set_master(pdev);
1768
1769         if (pci_request_regions(pdev, NAME53C8XX))
1770                 goto disable;
1771
1772         if (sym_check_supported(&sym_dev))
1773                 goto free;
1774
1775         if (sym_iomap_device(&sym_dev))
1776                 goto free;
1777         do_iounmap = 1;
1778
1779         if (sym_check_raid(&sym_dev)) {
1780                 do_disable_device = 0;  /* Don't disable the device */
1781                 goto free;
1782         }
1783
1784         if (sym_set_workarounds(&sym_dev))
1785                 goto free;
1786
1787         sym_config_pqs(pdev, &sym_dev);
1788
1789         sym_get_nvram(&sym_dev, &nvram);
1790
1791         do_iounmap = 0; /* Don't sym_iounmap_device() after sym_attach(). */
1792         shost = sym_attach(&sym2_template, attach_count, &sym_dev);
1793         if (!shost)
1794                 goto free;
1795
1796         if (scsi_add_host(shost, &pdev->dev))
1797                 goto detach;
1798         scsi_scan_host(shost);
1799
1800         attach_count++;
1801
1802         return 0;
1803
1804  detach:
1805         sym_detach(pci_get_drvdata(pdev), pdev);
1806  free:
1807         if (do_iounmap)
1808                 sym_iounmap_device(&sym_dev);
1809         pci_release_regions(pdev);
1810  disable:
1811         if (do_disable_device)
1812                 pci_disable_device(pdev);
1813  leave:
1814         return -ENODEV;
1815 }
1816
1817 static void sym2_remove(struct pci_dev *pdev)
1818 {
1819         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1820
1821         scsi_remove_host(shost);
1822         sym_detach(shost, pdev);
1823         pci_release_regions(pdev);
1824         pci_disable_device(pdev);
1825
1826         attach_count--;
1827 }
1828
1829 /**
1830  * sym2_io_error_detected() - called when PCI error is detected
1831  * @pdev: pointer to PCI device
1832  * @state: current state of the PCI slot
1833  */
1834 static pci_ers_result_t sym2_io_error_detected(struct pci_dev *pdev,
1835                                          enum pci_channel_state state)
1836 {
1837         /* If slot is permanently frozen, turn everything off */
1838         if (state == pci_channel_io_perm_failure) {
1839                 sym2_remove(pdev);
1840                 return PCI_ERS_RESULT_DISCONNECT;
1841         }
1842
1843         disable_irq(pdev->irq);
1844         pci_disable_device(pdev);
1845
1846         /* Request that MMIO be enabled, so register dump can be taken. */
1847         return PCI_ERS_RESULT_CAN_RECOVER;
1848 }
1849
1850 /**
1851  * sym2_io_slot_dump - Enable MMIO and dump debug registers
1852  * @pdev: pointer to PCI device
1853  */
1854 static pci_ers_result_t sym2_io_slot_dump(struct pci_dev *pdev)
1855 {
1856         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1857
1858         sym_dump_registers(shost);
1859
1860         /* Request a slot reset. */
1861         return PCI_ERS_RESULT_NEED_RESET;
1862 }
1863
1864 /**
1865  * sym2_reset_workarounds - hardware-specific work-arounds
1866  *
1867  * This routine is similar to sym_set_workarounds(), except
1868  * that, at this point, we already know that the device was
1869  * successfully initialized at least once before, and so most
1870  * of the steps taken there are un-needed here.
1871  */
1872 static void sym2_reset_workarounds(struct pci_dev *pdev)
1873 {
1874         u_short status_reg;
1875         struct sym_chip *chip;
1876
1877         chip = sym_lookup_chip_table(pdev->device, pdev->revision);
1878
1879         /* Work around for errant bit in 895A, in a fashion
1880          * similar to what is done in sym_set_workarounds().
1881          */
1882         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1883         if (!(chip->features & FE_66MHZ) && (status_reg & PCI_STATUS_66MHZ)) {
1884                 status_reg = PCI_STATUS_66MHZ;
1885                 pci_write_config_word(pdev, PCI_STATUS, status_reg);
1886                 pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1887         }
1888 }
1889
1890 /**
1891  * sym2_io_slot_reset() - called when the pci bus has been reset.
1892  * @pdev: pointer to PCI device
1893  *
1894  * Restart the card from scratch.
1895  */
1896 static pci_ers_result_t sym2_io_slot_reset(struct pci_dev *pdev)
1897 {
1898         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1899         struct sym_hcb *np = sym_get_hcb(shost);
1900
1901         printk(KERN_INFO "%s: recovering from a PCI slot reset\n",
1902                   sym_name(np));
1903
1904         if (pci_enable_device(pdev)) {
1905                 printk(KERN_ERR "%s: Unable to enable after PCI reset\n",
1906                         sym_name(np));
1907                 return PCI_ERS_RESULT_DISCONNECT;
1908         }
1909
1910         pci_set_master(pdev);
1911         enable_irq(pdev->irq);
1912
1913         /* If the chip can do Memory Write Invalidate, enable it */
1914         if (np->features & FE_WRIE) {
1915                 if (pci_set_mwi(pdev))
1916                         return PCI_ERS_RESULT_DISCONNECT;
1917         }
1918
1919         /* Perform work-arounds, analogous to sym_set_workarounds() */
1920         sym2_reset_workarounds(pdev);
1921
1922         /* Perform host reset only on one instance of the card */
1923         if (PCI_FUNC(pdev->devfn) == 0) {
1924                 if (sym_reset_scsi_bus(np, 0)) {
1925                         printk(KERN_ERR "%s: Unable to reset scsi host\n",
1926                                 sym_name(np));
1927                         return PCI_ERS_RESULT_DISCONNECT;
1928                 }
1929                 sym_start_up(shost, 1);
1930         }
1931
1932         return PCI_ERS_RESULT_RECOVERED;
1933 }
1934
1935 /**
1936  * sym2_io_resume() - resume normal ops after PCI reset
1937  * @pdev: pointer to PCI device
1938  *
1939  * Called when the error recovery driver tells us that its
1940  * OK to resume normal operation. Use completion to allow
1941  * halted scsi ops to resume.
1942  */
1943 static void sym2_io_resume(struct pci_dev *pdev)
1944 {
1945         struct Scsi_Host *shost = pci_get_drvdata(pdev);
1946         struct sym_data *sym_data = shost_priv(shost);
1947
1948         spin_lock_irq(shost->host_lock);
1949         if (sym_data->io_reset)
1950                 complete_all(sym_data->io_reset);
1951         spin_unlock_irq(shost->host_lock);
1952 }
1953
1954 static void sym2_get_signalling(struct Scsi_Host *shost)
1955 {
1956         struct sym_hcb *np = sym_get_hcb(shost);
1957         enum spi_signal_type type;
1958
1959         switch (np->scsi_mode) {
1960         case SMODE_SE:
1961                 type = SPI_SIGNAL_SE;
1962                 break;
1963         case SMODE_LVD:
1964                 type = SPI_SIGNAL_LVD;
1965                 break;
1966         case SMODE_HVD:
1967                 type = SPI_SIGNAL_HVD;
1968                 break;
1969         default:
1970                 type = SPI_SIGNAL_UNKNOWN;
1971                 break;
1972         }
1973         spi_signalling(shost) = type;
1974 }
1975
1976 static void sym2_set_offset(struct scsi_target *starget, int offset)
1977 {
1978         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1979         struct sym_hcb *np = sym_get_hcb(shost);
1980         struct sym_tcb *tp = &np->target[starget->id];
1981
1982         tp->tgoal.offset = offset;
1983         tp->tgoal.check_nego = 1;
1984 }
1985
1986 static void sym2_set_period(struct scsi_target *starget, int period)
1987 {
1988         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
1989         struct sym_hcb *np = sym_get_hcb(shost);
1990         struct sym_tcb *tp = &np->target[starget->id];
1991
1992         /* have to have DT for these transfers, but DT will also
1993          * set width, so check that this is allowed */
1994         if (period <= np->minsync && spi_width(starget))
1995                 tp->tgoal.dt = 1;
1996
1997         tp->tgoal.period = period;
1998         tp->tgoal.check_nego = 1;
1999 }
2000
2001 static void sym2_set_width(struct scsi_target *starget, int width)
2002 {
2003         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2004         struct sym_hcb *np = sym_get_hcb(shost);
2005         struct sym_tcb *tp = &np->target[starget->id];
2006
2007         /* It is illegal to have DT set on narrow transfers.  If DT is
2008          * clear, we must also clear IU and QAS.  */
2009         if (width == 0)
2010                 tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
2011
2012         tp->tgoal.width = width;
2013         tp->tgoal.check_nego = 1;
2014 }
2015
2016 static void sym2_set_dt(struct scsi_target *starget, int dt)
2017 {
2018         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2019         struct sym_hcb *np = sym_get_hcb(shost);
2020         struct sym_tcb *tp = &np->target[starget->id];
2021
2022         /* We must clear QAS and IU if DT is clear */
2023         if (dt)
2024                 tp->tgoal.dt = 1;
2025         else
2026                 tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
2027         tp->tgoal.check_nego = 1;
2028 }
2029
2030 #if 0
2031 static void sym2_set_iu(struct scsi_target *starget, int iu)
2032 {
2033         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2034         struct sym_hcb *np = sym_get_hcb(shost);
2035         struct sym_tcb *tp = &np->target[starget->id];
2036
2037         if (iu)
2038                 tp->tgoal.iu = tp->tgoal.dt = 1;
2039         else
2040                 tp->tgoal.iu = 0;
2041         tp->tgoal.check_nego = 1;
2042 }
2043
2044 static void sym2_set_qas(struct scsi_target *starget, int qas)
2045 {
2046         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2047         struct sym_hcb *np = sym_get_hcb(shost);
2048         struct sym_tcb *tp = &np->target[starget->id];
2049
2050         if (qas)
2051                 tp->tgoal.dt = tp->tgoal.qas = 1;
2052         else
2053                 tp->tgoal.qas = 0;
2054         tp->tgoal.check_nego = 1;
2055 }
2056 #endif
2057
2058 static struct spi_function_template sym2_transport_functions = {
2059         .set_offset     = sym2_set_offset,
2060         .show_offset    = 1,
2061         .set_period     = sym2_set_period,
2062         .show_period    = 1,
2063         .set_width      = sym2_set_width,
2064         .show_width     = 1,
2065         .set_dt         = sym2_set_dt,
2066         .show_dt        = 1,
2067 #if 0
2068         .set_iu         = sym2_set_iu,
2069         .show_iu        = 1,
2070         .set_qas        = sym2_set_qas,
2071         .show_qas       = 1,
2072 #endif
2073         .get_signalling = sym2_get_signalling,
2074 };
2075
2076 static struct pci_device_id sym2_id_table[] __devinitdata = {
2077         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C810,
2078           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2079         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C820,
2080           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2081         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C825,
2082           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2083         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C815,
2084           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2085         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C810AP,
2086           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2087         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C860,
2088           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2089         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1510,
2090           PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_SCSI<<8,  0xffff00, 0UL },
2091         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C896,
2092           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2093         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C895,
2094           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2095         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C885,
2096           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2097         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875,
2098           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2099         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C1510,
2100           PCI_ANY_ID, PCI_ANY_ID,  PCI_CLASS_STORAGE_SCSI<<8,  0xffff00, 0UL }, /* new */
2101         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C895A,
2102           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2103         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C875A,
2104           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2105         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_33,
2106           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2107         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_66,
2108           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2109         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875J,
2110           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2111         { 0, }
2112 };
2113
2114 MODULE_DEVICE_TABLE(pci, sym2_id_table);
2115
2116 static struct pci_error_handlers sym2_err_handler = {
2117         .error_detected = sym2_io_error_detected,
2118         .mmio_enabled   = sym2_io_slot_dump,
2119         .slot_reset     = sym2_io_slot_reset,
2120         .resume         = sym2_io_resume,
2121 };
2122
2123 static struct pci_driver sym2_driver = {
2124         .name           = NAME53C8XX,
2125         .id_table       = sym2_id_table,
2126         .probe          = sym2_probe,
2127         .remove         = sym2_remove,
2128         .err_handler    = &sym2_err_handler,
2129 };
2130
2131 static int __init sym2_init(void)
2132 {
2133         int error;
2134
2135         sym2_setup_params();
2136         sym2_transport_template = spi_attach_transport(&sym2_transport_functions);
2137         if (!sym2_transport_template)
2138                 return -ENODEV;
2139
2140         error = pci_register_driver(&sym2_driver);
2141         if (error)
2142                 spi_release_transport(sym2_transport_template);
2143         return error;
2144 }
2145
2146 static void __exit sym2_exit(void)
2147 {
2148         pci_unregister_driver(&sym2_driver);
2149         spi_release_transport(sym2_transport_template);
2150 }
2151
2152 module_init(sym2_init);
2153 module_exit(sym2_exit);