err.no Git - linux-2.6/blob - 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/interrupt.h>
  43 #include <linux/module.h>
  44 #include <linux/moduleparam.h>
  45 #include <linux/spinlock.h>
  46 #include <scsi/scsi.h>
  47 #include <scsi/scsi_tcq.h>
  48 #include <scsi/scsi_device.h>
  49 #include <scsi/scsi_transport.h>
  50
  51 #include "sym_glue.h"
  52 #include "sym_nvram.h"
  53
  54 #define NAME53C         "sym53c"
  55 #define NAME53C8XX      "sym53c8xx"
  56
  57 /* SPARC just has to be different ... */
  58 #ifdef __sparc__
  59 #define IRQ_FMT "%s"
  60 #define IRQ_PRM(x) __irq_itoa(x)
  61 #else
  62 #define IRQ_FMT "%d"
  63 #define IRQ_PRM(x) (x)
  64 #endif
  65
  66 struct sym_driver_setup sym_driver_setup = SYM_LINUX_DRIVER_SETUP;
  67 unsigned int sym_debug_flags = 0;
  68
  69 static char *excl_string;
  70 static char *safe_string;
  71 module_param_named(cmd_per_lun, sym_driver_setup.max_tag, ushort, 0);
  72 module_param_string(tag_ctrl, sym_driver_setup.tag_ctrl, 100, 0);
  73 module_param_named(burst, sym_driver_setup.burst_order, byte, 0);
  74 module_param_named(led, sym_driver_setup.scsi_led, byte, 0);
  75 module_param_named(diff, sym_driver_setup.scsi_diff, byte, 0);
  76 module_param_named(irqm, sym_driver_setup.irq_mode, byte, 0);
  77 module_param_named(buschk, sym_driver_setup.scsi_bus_check, byte, 0);
  78 module_param_named(hostid, sym_driver_setup.host_id, byte, 0);
  79 module_param_named(verb, sym_driver_setup.verbose, byte, 0);
  80 module_param_named(debug, sym_debug_flags, uint, 0);
  81 module_param_named(settle, sym_driver_setup.settle_delay, byte, 0);
  82 module_param_named(nvram, sym_driver_setup.use_nvram, byte, 0);
  83 module_param_named(excl, excl_string, charp, 0);
  84 module_param_named(safe, safe_string, charp, 0);
  85
  86 MODULE_PARM_DESC(cmd_per_lun, "The maximum number of tags to use by default");
  87 MODULE_PARM_DESC(tag_ctrl, "More detailed control over tags per LUN");
  88 MODULE_PARM_DESC(burst, "Maximum burst.  0 to disable, 255 to read from registers");
  89 MODULE_PARM_DESC(led, "Set to 1 to enable LED support");
  90 MODULE_PARM_DESC(diff, "0 for no differential mode, 1 for BIOS, 2 for always, 3 for not GPIO3");
  91 MODULE_PARM_DESC(irqm, "0 for open drain, 1 to leave alone, 2 for totem pole");
  92 MODULE_PARM_DESC(buschk, "0 to not check, 1 for detach on error, 2 for warn on error");
  93 MODULE_PARM_DESC(hostid, "The SCSI ID to use for the host adapters");
  94 MODULE_PARM_DESC(verb, "0 for minimal verbosity, 1 for normal, 2 for excessive");
  95 MODULE_PARM_DESC(debug, "Set bits to enable debugging");
  96 MODULE_PARM_DESC(settle, "Settle delay in seconds.  Default 3");
  97 MODULE_PARM_DESC(nvram, "Option currently not used");
  98 MODULE_PARM_DESC(excl, "List ioport addresses here to prevent controllers from being attached");
  99 MODULE_PARM_DESC(safe, "Set other settings to a \"safe mode\"");
 100
 101 MODULE_LICENSE("GPL");
 102 MODULE_VERSION(SYM_VERSION);
 103 MODULE_AUTHOR("Matthew Wilcox <matthew@wil.cx>");
 104 MODULE_DESCRIPTION("NCR, Symbios and LSI 8xx and 1010 PCI SCSI adapters");
 105
 106 static void sym2_setup_params(void)
 107 {
 108         char *p = excl_string;
 109         int xi = 0;
 110
 111         while (p && (xi < 8)) {
 112                 char *next_p;
 113                 int val = (int) simple_strtoul(p, &next_p, 0);
 114                 sym_driver_setup.excludes[xi++] = val;
 115                 p = next_p;
 116         }
 117
 118         if (safe_string) {
 119                 if (*safe_string == 'y') {
 120                         sym_driver_setup.max_tag = 0;
 121                         sym_driver_setup.burst_order = 0;
 122                         sym_driver_setup.scsi_led = 0;
 123                         sym_driver_setup.scsi_diff = 1;
 124                         sym_driver_setup.irq_mode = 0;
 125                         sym_driver_setup.scsi_bus_check = 2;
 126                         sym_driver_setup.host_id = 7;
 127                         sym_driver_setup.verbose = 2;
 128                         sym_driver_setup.settle_delay = 10;
 129                         sym_driver_setup.use_nvram = 1;
 130                 } else if (*safe_string != 'n') {
 131                         printk(KERN_WARNING NAME53C8XX "Ignoring parameter %s"
 132                                         " passed to safe option", safe_string);
 133                 }
 134         }
 135 }
 136
 137 /*
 138  * We used to try to deal with 64-bit BARs here, but don't any more.
 139  * There are many parts of this driver which would need to be modified
 140  * to handle a 64-bit base address, including scripts.  I'm uncomfortable
 141  * with making those changes when I have no way of testing it, so I'm
 142  * just going to disable it.
 143  *
 144  * Note that some machines (eg HP rx8620 and Superdome) have bus addresses
 145  * below 4GB and physical addresses above 4GB.  These will continue to work.
 146  */
 147 static int __devinit
 148 pci_get_base_address(struct pci_dev *pdev, int index, unsigned long *basep)
 149 {
 150         u32 tmp;
 151         unsigned long base;
 152 #define PCI_BAR_OFFSET(index) (PCI_BASE_ADDRESS_0 + (index<<2))
 153
 154         pci_read_config_dword(pdev, PCI_BAR_OFFSET(index++), &tmp);
 155         base = tmp;
 156         if ((tmp & 0x7) == PCI_BASE_ADDRESS_MEM_TYPE_64) {
 157                 pci_read_config_dword(pdev, PCI_BAR_OFFSET(index++), &tmp);
 158                 if (tmp > 0) {
 159                         dev_err(&pdev->dev,
 160                                 "BAR %d is 64-bit, disabling\n", index - 1);
 161                         base = 0;
 162                 }
 163         }
 164
 165         if ((base & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
 166                 base &= PCI_BASE_ADDRESS_IO_MASK;
 167         } else {
 168                 base &= PCI_BASE_ADDRESS_MEM_MASK;
 169         }
 170
 171         *basep = base;
 172         return index;
 173 #undef PCI_BAR_OFFSET
 174 }
 175
 176 static struct scsi_transport_template *sym2_transport_template = NULL;
 177
 178 /*
 179  *  Used by the eh thread to wait for command completion.
 180  *  It is allocated on the eh thread stack.
 181  */
 182 struct sym_eh_wait {
 183         struct completion done;
 184         struct timer_list timer;
 185         void (*old_done)(struct scsi_cmnd *);
 186         int to_do;
 187         int timed_out;
 188 };
 189
 190 /*
 191  *  Driver private area in the SCSI command structure.
 192  */
 193 struct sym_ucmd {               /* Override the SCSI pointer structure */
 194         dma_addr_t data_mapping;
 195         u_char  data_mapped;
 196         struct sym_eh_wait *eh_wait;
 197 };
 198
 199 #define SYM_UCMD_PTR(cmd)  ((struct sym_ucmd *)(&(cmd)->SCp))
 200 #define SYM_SOFTC_PTR(cmd) sym_get_hcb(cmd->device->host)
 201
 202 static void __unmap_scsi_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
 203 {
 204         int dma_dir = cmd->sc_data_direction;
 205
 206         switch(SYM_UCMD_PTR(cmd)->data_mapped) {
 207         case 2:
 208                 pci_unmap_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
 209                 break;
 210         case 1:
 211                 pci_unmap_single(pdev, SYM_UCMD_PTR(cmd)->data_mapping,
 212                                  cmd->request_bufflen, dma_dir);
 213                 break;
 214         }
 215         SYM_UCMD_PTR(cmd)->data_mapped = 0;
 216 }
 217
 218 static dma_addr_t __map_scsi_single_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
 219 {
 220         dma_addr_t mapping;
 221         int dma_dir = cmd->sc_data_direction;
 222
 223         mapping = pci_map_single(pdev, cmd->request_buffer,
 224                                  cmd->request_bufflen, dma_dir);
 225         if (mapping) {
 226                 SYM_UCMD_PTR(cmd)->data_mapped  = 1;
 227                 SYM_UCMD_PTR(cmd)->data_mapping = mapping;
 228         }
 229
 230         return mapping;
 231 }
 232
 233 static int __map_scsi_sg_data(struct pci_dev *pdev, struct scsi_cmnd *cmd)
 234 {
 235         int use_sg;
 236         int dma_dir = cmd->sc_data_direction;
 237
 238         use_sg = pci_map_sg(pdev, cmd->buffer, cmd->use_sg, dma_dir);
 239         if (use_sg > 0) {
 240                 SYM_UCMD_PTR(cmd)->data_mapped  = 2;
 241                 SYM_UCMD_PTR(cmd)->data_mapping = use_sg;
 242         }
 243
 244         return use_sg;
 245 }
 246
 247 #define unmap_scsi_data(np, cmd)        \
 248                 __unmap_scsi_data(np->s.device, cmd)
 249 #define map_scsi_single_data(np, cmd)   \
 250                 __map_scsi_single_data(np->s.device, cmd)
 251 #define map_scsi_sg_data(np, cmd)       \
 252                 __map_scsi_sg_data(np->s.device, cmd)
 253 /*
 254  *  Complete a pending CAM CCB.
 255  */
 256 void sym_xpt_done(struct sym_hcb *np, struct scsi_cmnd *cmd)
 257 {
 258         unmap_scsi_data(np, cmd);
 259         cmd->scsi_done(cmd);
 260 }
 261
 262 static void sym_xpt_done2(struct sym_hcb *np, struct scsi_cmnd *cmd, int cam_status)
 263 {
 264         sym_set_cam_status(cmd, cam_status);
 265         sym_xpt_done(np, cmd);
 266 }
 267
 268
 269 /*
 270  *  Tell the SCSI layer about a BUS RESET.
 271  */
 272 void sym_xpt_async_bus_reset(struct sym_hcb *np)
 273 {
 274         printf_notice("%s: SCSI BUS has been reset.\n", sym_name(np));
 275         np->s.settle_time = jiffies + sym_driver_setup.settle_delay * HZ;
 276         np->s.settle_time_valid = 1;
 277         if (sym_verbose >= 2)
 278                 printf_info("%s: command processing suspended for %d seconds\n",
 279                             sym_name(np), sym_driver_setup.settle_delay);
 280 }
 281
 282 /*
 283  *  Tell the SCSI layer about a BUS DEVICE RESET message sent.
 284  */
 285 void sym_xpt_async_sent_bdr(struct sym_hcb *np, int target)
 286 {
 287         printf_notice("%s: TARGET %d has been reset.\n", sym_name(np), target);
 288 }
 289
 290 /*
 291  *  Choose the more appropriate CAM status if
 292  *  the IO encountered an extended error.
 293  */
 294 static int sym_xerr_cam_status(int cam_status, int x_status)
 295 {
 296         if (x_status) {
 297                 if      (x_status & XE_PARITY_ERR)
 298                         cam_status = DID_PARITY;
 299                 else if (x_status &(XE_EXTRA_DATA|XE_SODL_UNRUN|XE_SWIDE_OVRUN))
 300                         cam_status = DID_ERROR;
 301                 else if (x_status & XE_BAD_PHASE)
 302                         cam_status = DID_ERROR;
 303                 else
 304                         cam_status = DID_ERROR;
 305         }
 306         return cam_status;
 307 }
 308
 309 /*
 310  *  Build CAM result for a failed or auto-sensed IO.
 311  */
 312 void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
 313 {
 314         struct scsi_cmnd *cmd = cp->cmd;
 315         u_int cam_status, scsi_status, drv_status;
 316
 317         drv_status  = 0;
 318         cam_status  = DID_OK;
 319         scsi_status = cp->ssss_status;
 320
 321         if (cp->host_flags & HF_SENSE) {
 322                 scsi_status = cp->sv_scsi_status;
 323                 resid = cp->sv_resid;
 324                 if (sym_verbose && cp->sv_xerr_status)
 325                         sym_print_xerr(cmd, cp->sv_xerr_status);
 326                 if (cp->host_status == HS_COMPLETE &&
 327                     cp->ssss_status == S_GOOD &&
 328                     cp->xerr_status == 0) {
 329                         cam_status = sym_xerr_cam_status(DID_OK,
 330                                                          cp->sv_xerr_status);
 331                         drv_status = DRIVER_SENSE;
 332                         /*
 333                          *  Bounce back the sense data to user.
 334                          */
 335                         memset(&cmd->sense_buffer, 0, sizeof(cmd->sense_buffer));
 336                         memcpy(cmd->sense_buffer, cp->sns_bbuf,
 337                               min(sizeof(cmd->sense_buffer),
 338                                   (size_t)SYM_SNS_BBUF_LEN));
 339 #if 0
 340                         /*
 341                          *  If the device reports a UNIT ATTENTION condition
 342                          *  due to a RESET condition, we should consider all
 343                          *  disconnect CCBs for this unit as aborted.
 344                          */
 345                         if (1) {
 346                                 u_char *p;
 347                                 p  = (u_char *) cmd->sense_data;
 348                                 if (p[0]==0x70 && p[2]==0x6 && p[12]==0x29)
 349                                         sym_clear_tasks(np, DID_ABORT,
 350                                                         cp->target,cp->lun, -1);
 351                         }
 352 #endif
 353                 } else {
 354                         /*
 355                          * Error return from our internal request sense.  This
 356                          * is bad: we must clear the contingent allegiance
 357                          * condition otherwise the device will always return
 358                          * BUSY.  Use a big stick.
 359                          */
 360                         sym_reset_scsi_target(np, cmd->device->id);
 361                         cam_status = DID_ERROR;
 362                 }
 363         } else if (cp->host_status == HS_COMPLETE)      /* Bad SCSI status */
 364                 cam_status = DID_OK;
 365         else if (cp->host_status == HS_SEL_TIMEOUT)     /* Selection timeout */
 366                 cam_status = DID_NO_CONNECT;
 367         else if (cp->host_status == HS_UNEXPECTED)      /* Unexpected BUS FREE*/
 368                 cam_status = DID_ERROR;
 369         else {                                          /* Extended error */
 370                 if (sym_verbose) {
 371                         sym_print_addr(cmd, "COMMAND FAILED (%x %x %x).\n",
 372                                 cp->host_status, cp->ssss_status,
 373                                 cp->xerr_status);
 374                 }
 375                 /*
 376                  *  Set the most appropriate value for CAM status.
 377                  */
 378                 cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
 379         }
 380         cmd->resid = resid;
 381         cmd->result = (drv_status << 24) + (cam_status << 16) + scsi_status;
 382 }
 383
 384
 385 /*
 386  *  Build the scatter/gather array for an I/O.
 387  */
 388
 389 static int sym_scatter_no_sglist(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
 390 {
 391         struct sym_tblmove *data = &cp->phys.data[SYM_CONF_MAX_SG-1];
 392         int segment;
 393         unsigned int len = cmd->request_bufflen;
 394
 395         if (len) {
 396                 dma_addr_t baddr = map_scsi_single_data(np, cmd);
 397                 if (baddr) {
 398                         if (len & 1) {
 399                                 struct sym_tcb *tp = &np->target[cp->target];
 400                                 if (tp->head.wval & EWS) {
 401                                         len++;
 402                                         cp->odd_byte_adjustment++;
 403                                 }
 404                         }
 405                         cp->data_len = len;
 406                         sym_build_sge(np, data, baddr, len);
 407                         segment = 1;
 408                 } else {
 409                         segment = -2;
 410                 }
 411         } else {
 412                 segment = 0;
 413         }
 414
 415         return segment;
 416 }
 417
 418 static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
 419 {
 420         int segment;
 421         int use_sg = (int) cmd->use_sg;
 422
 423         cp->data_len = 0;
 424
 425         if (!use_sg)
 426                 segment = sym_scatter_no_sglist(np, cp, cmd);
 427         else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
 428                 struct scatterlist *scatter = (struct scatterlist *)cmd->buffer;
 429                 struct sym_tcb *tp = &np->target[cp->target];
 430                 struct sym_tblmove *data;
 431
 432                 if (use_sg > SYM_CONF_MAX_SG) {
 433                         unmap_scsi_data(np, cmd);
 434                         return -1;
 435                 }
 436
 437                 data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];
 438
 439                 for (segment = 0; segment < use_sg; segment++) {
 440                         dma_addr_t baddr = sg_dma_address(&scatter[segment]);
 441                         unsigned int len = sg_dma_len(&scatter[segment]);
 442
 443                         if ((len & 1) && (tp->head.wval & EWS)) {
 444                                 len++;
 445                                 cp->odd_byte_adjustment++;
 446                         }
 447
 448                         sym_build_sge(np, &data[segment], baddr, len);
 449                         cp->data_len += len;
 450                 }
 451         } else {
 452                 segment = -2;
 453         }
 454
 455         return segment;
 456 }
 457
 458 /*
 459  *  Queue a SCSI command.
 460  */
 461 static int sym_queue_command(struct sym_hcb *np, struct scsi_cmnd *cmd)
 462 {
 463         struct scsi_device *sdev = cmd->device;
 464         struct sym_tcb *tp;
 465         struct sym_lcb *lp;
 466         struct sym_ccb *cp;
 467         int     order;
 468
 469         /*
 470          *  Minimal checkings, so that we will not
 471          *  go outside our tables.
 472          */
 473         if (sdev->id == np->myaddr) {
 474                 sym_xpt_done2(np, cmd, DID_NO_CONNECT);
 475                 return 0;
 476         }
 477
 478         /*
 479          *  Retrieve the target descriptor.
 480          */
 481         tp = &np->target[sdev->id];
 482
 483         /*
 484          *  Select tagged/untagged.
 485          */
 486         lp = sym_lp(tp, sdev->lun);
 487         order = (lp && lp->s.reqtags) ? M_SIMPLE_TAG : 0;
 488
 489         /*
 490          *  Queue the SCSI IO.
 491          */
 492         cp = sym_get_ccb(np, cmd, order);
 493         if (!cp)
 494                 return 1;       /* Means resource shortage */
 495         sym_queue_scsiio(np, cmd, cp);
 496         return 0;
 497 }
 498
 499 /*
 500  *  Setup buffers and pointers that address the CDB.
 501  */
 502 static inline int sym_setup_cdb(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
 503 {
 504         memcpy(cp->cdb_buf, cmd->cmnd, cmd->cmd_len);
 505
 506         cp->phys.cmd.addr = CCB_BA(cp, cdb_buf[0]);
 507         cp->phys.cmd.size = cpu_to_scr(cmd->cmd_len);
 508
 509         return 0;
 510 }
 511
 512 /*
 513  *  Setup pointers that address the data and start the I/O.
 514  */
 515 int sym_setup_data_and_start(struct sym_hcb *np, struct scsi_cmnd *cmd, struct sym_ccb *cp)
 516 {
 517         struct sym_tcb *tp = &np->target[cp->target];
 518         struct sym_lcb *lp = sym_lp(tp, cp->lun);
 519         u32 lastp, goalp;
 520         int dir;
 521
 522         /*
 523          *  Build the CDB.
 524          */
 525         if (sym_setup_cdb(np, cmd, cp))
 526                 goto out_abort;
 527
 528         /*
 529          *  No direction means no data.
 530          */
 531         dir = cmd->sc_data_direction;
 532         if (dir != DMA_NONE) {
 533                 cp->segments = sym_scatter(np, cp, cmd);
 534                 if (cp->segments < 0) {
 535                         sym_set_cam_status(cmd, DID_ERROR);
 536                         goto out_abort;
 537                 }
 538
 539                 /*
 540                  *  No segments means no data.
 541                  */
 542                 if (!cp->segments)
 543                         dir = DMA_NONE;
 544         } else {
 545                 cp->data_len = 0;
 546                 cp->segments = 0;
 547         }
 548
 549         /*
 550          *  Set the data pointer.
 551          */
 552         switch (dir) {
 553         case DMA_BIDIRECTIONAL:
 554                 printk("%s: got DMA_BIDIRECTIONAL command", sym_name(np));
 555                 sym_set_cam_status(cmd, DID_ERROR);
 556                 goto out_abort;
 557         case DMA_TO_DEVICE:
 558                 goalp = SCRIPTA_BA(np, data_out2) + 8;
 559                 lastp = goalp - 8 - (cp->segments * (2*4));
 560                 break;
 561         case DMA_FROM_DEVICE:
 562                 cp->host_flags |= HF_DATA_IN;
 563                 goalp = SCRIPTA_BA(np, data_in2) + 8;
 564                 lastp = goalp - 8 - (cp->segments * (2*4));
 565                 break;
 566         case DMA_NONE:
 567         default:
 568                 lastp = goalp = SCRIPTB_BA(np, no_data);
 569                 break;
 570         }
 571
 572         /*
 573          *  Set all pointers values needed by SCRIPTS.
 574          */
 575         cp->phys.head.lastp = cpu_to_scr(lastp);
 576         cp->phys.head.savep = cpu_to_scr(lastp);
 577         cp->startp          = cp->phys.head.savep;
 578         cp->goalp           = cpu_to_scr(goalp);
 579
 580         /*
 581          *  When `#ifed 1', the code below makes the driver
 582          *  panic on the first attempt to write to a SCSI device.
 583          *  It is the first test we want to do after a driver
 584          *  change that does not seem obviously safe. :)
 585          */
 586 #if 0
 587         switch (cp->cdb_buf[0]) {
 588         case 0x0A: case 0x2A: case 0xAA:
 589                 panic("XXXXXXXXXXXXX WRITE NOT YET ALLOWED XXXXXXXXXXXXXX\n");
 590                 break;
 591         default:
 592                 break;
 593         }
 594 #endif
 595
 596         /*
 597          *      activate this job.
 598          */
 599         sym_start_next_ccbs(np, lp, 2);
 600         return 0;
 601
 602 out_abort:
 603         sym_free_ccb(np, cp);
 604         sym_xpt_done(np, cmd);
 605         return 0;
 606 }
 607
 608
 609 /*
 610  *  timer daemon.
 611  *
 612  *  Misused to keep the driver running when
 613  *  interrupts are not configured correctly.
 614  */
 615 static void sym_timer(struct sym_hcb *np)
 616 {
 617         unsigned long thistime = jiffies;
 618
 619         /*
 620          *  Restart the timer.
 621          */
 622         np->s.timer.expires = thistime + SYM_CONF_TIMER_INTERVAL;
 623         add_timer(&np->s.timer);
 624
 625         /*
 626          *  If we are resetting the ncr, wait for settle_time before
 627          *  clearing it. Then command processing will be resumed.
 628          */
 629         if (np->s.settle_time_valid) {
 630                 if (time_before_eq(np->s.settle_time, thistime)) {
 631                         if (sym_verbose >= 2 )
 632                                 printk("%s: command processing resumed\n",
 633                                        sym_name(np));
 634                         np->s.settle_time_valid = 0;
 635                 }
 636                 return;
 637         }
 638
 639         /*
 640          *      Nothing to do for now, but that may come.
 641          */
 642         if (np->s.lasttime + 4*HZ < thistime) {
 643                 np->s.lasttime = thistime;
 644         }
 645
 646 #ifdef SYM_CONF_PCIQ_MAY_MISS_COMPLETIONS
 647         /*
 648          *  Some way-broken PCI bridges may lead to
 649          *  completions being lost when the clearing
 650          *  of the INTFLY flag by the CPU occurs
 651          *  concurrently with the chip raising this flag.
 652          *  If this ever happen, lost completions will
 653          * be reaped here.
 654          */
 655         sym_wakeup_done(np);
 656 #endif
 657 }
 658
 659
 660 /*
 661  *  PCI BUS error handler.
 662  */
 663 void sym_log_bus_error(struct sym_hcb *np)
 664 {
 665         u_short pci_sts;
 666         pci_read_config_word(np->s.device, PCI_STATUS, &pci_sts);
 667         if (pci_sts & 0xf900) {
 668                 pci_write_config_word(np->s.device, PCI_STATUS, pci_sts);
 669                 printf("%s: PCI STATUS = 0x%04x\n",
 670                         sym_name(np), pci_sts & 0xf900);
 671         }
 672 }
 673
 674 /*
 675  * queuecommand method.  Entered with the host adapter lock held and
 676  * interrupts disabled.
 677  */
 678 static int sym53c8xx_queue_command(struct scsi_cmnd *cmd,
 679                                         void (*done)(struct scsi_cmnd *))
 680 {
 681         struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
 682         struct sym_ucmd *ucp = SYM_UCMD_PTR(cmd);
 683         int sts = 0;
 684
 685         cmd->scsi_done     = done;
 686         memset(ucp, 0, sizeof(*ucp));
 687
 688         /*
 689          *  Shorten our settle_time if needed for
 690          *  this command not to time out.
 691          */
 692         if (np->s.settle_time_valid && cmd->timeout_per_command) {
 693                 unsigned long tlimit = jiffies + cmd->timeout_per_command;
 694                 tlimit -= SYM_CONF_TIMER_INTERVAL*2;
 695                 if (time_after(np->s.settle_time, tlimit)) {
 696                         np->s.settle_time = tlimit;
 697                 }
 698         }
 699
 700         if (np->s.settle_time_valid)
 701                 return SCSI_MLQUEUE_HOST_BUSY;
 702
 703         sts = sym_queue_command(np, cmd);
 704         if (sts)
 705                 return SCSI_MLQUEUE_HOST_BUSY;
 706         return 0;
 707 }
 708
 709 /*
 710  *  Linux entry point of the interrupt handler.
 711  */
 712 static irqreturn_t sym53c8xx_intr(int irq, void *dev_id, struct pt_regs * regs)
 713 {
 714         unsigned long flags;
 715         struct sym_hcb *np = (struct sym_hcb *)dev_id;
 716
 717         if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("[");
 718
 719         spin_lock_irqsave(np->s.host->host_lock, flags);
 720         sym_interrupt(np);
 721         spin_unlock_irqrestore(np->s.host->host_lock, flags);
 722
 723         if (DEBUG_FLAGS & DEBUG_TINY) printf_debug ("]\n");
 724
 725         return IRQ_HANDLED;
 726 }
 727
 728 /*
 729  *  Linux entry point of the timer handler
 730  */
 731 static void sym53c8xx_timer(unsigned long npref)
 732 {
 733         struct sym_hcb *np = (struct sym_hcb *)npref;
 734         unsigned long flags;
 735
 736         spin_lock_irqsave(np->s.host->host_lock, flags);
 737         sym_timer(np);
 738         spin_unlock_irqrestore(np->s.host->host_lock, flags);
 739 }
 740
 741
 742 /*
 743  *  What the eh thread wants us to perform.
 744  */
 745 #define SYM_EH_ABORT            0
 746 #define SYM_EH_DEVICE_RESET     1
 747 #define SYM_EH_BUS_RESET        2
 748 #define SYM_EH_HOST_RESET       3
 749
 750 /*
 751  *  What we will do regarding the involved SCSI command.
 752  */
 753 #define SYM_EH_DO_IGNORE        0
 754 #define SYM_EH_DO_COMPLETE      1
 755 #define SYM_EH_DO_WAIT          2
 756
 757 /*
 758  *  Our general completion handler.
 759  */
 760 static void __sym_eh_done(struct scsi_cmnd *cmd, int timed_out)
 761 {
 762         struct sym_eh_wait *ep = SYM_UCMD_PTR(cmd)->eh_wait;
 763         if (!ep)
 764                 return;
 765
 766         /* Try to avoid a race here (not 100% safe) */
 767         if (!timed_out) {
 768                 ep->timed_out = 0;
 769                 if (ep->to_do == SYM_EH_DO_WAIT && !del_timer(&ep->timer))
 770                         return;
 771         }
 772
 773         /* Revert everything */
 774         SYM_UCMD_PTR(cmd)->eh_wait = NULL;
 775         cmd->scsi_done = ep->old_done;
 776
 777         /* Wake up the eh thread if it wants to sleep */
 778         if (ep->to_do == SYM_EH_DO_WAIT)
 779                 complete(&ep->done);
 780 }
 781
 782 /*
 783  *  scsi_done() alias when error recovery is in progress.
 784  */
 785 static void sym_eh_done(struct scsi_cmnd *cmd) { __sym_eh_done(cmd, 0); }
 786
 787 /*
 788  *  Some timeout handler to avoid waiting too long.
 789  */
 790 static void sym_eh_timeout(u_long p) { __sym_eh_done((struct scsi_cmnd *)p, 1); }
 791
 792 /*
 793  *  Generic method for our eh processing.
 794  *  The 'op' argument tells what we have to do.
 795  */
 796 static int sym_eh_handler(int op, char *opname, struct scsi_cmnd *cmd)
 797 {
 798         struct sym_hcb *np = SYM_SOFTC_PTR(cmd);
 799         SYM_QUEHEAD *qp;
 800         int to_do = SYM_EH_DO_IGNORE;
 801         int sts = -1;
 802         struct sym_eh_wait eh, *ep = &eh;
 803
 804         dev_warn(&cmd->device->sdev_gendev, "%s operation started.\n", opname);
 805
 806         /* This one is queued in some place -> to wait for completion */
 807         FOR_EACH_QUEUED_ELEMENT(&np->busy_ccbq, qp) {
 808                 struct sym_ccb *cp = sym_que_entry(qp, struct sym_ccb, link_ccbq);
 809                 if (cp->cmd == cmd) {
 810                         to_do = SYM_EH_DO_WAIT;
 811                         goto prepare;
 812                 }
 813         }
 814
 815 prepare:
 816         /* Prepare stuff to either ignore, complete or wait for completion */
 817         switch(to_do) {
 818         default:
 819         case SYM_EH_DO_IGNORE:
 820                 break;
 821         case SYM_EH_DO_WAIT:
 822                 init_completion(&ep->done);
 823                 /* fall through */
 824         case SYM_EH_DO_COMPLETE:
 825                 ep->old_done = cmd->scsi_done;
 826                 cmd->scsi_done = sym_eh_done;
 827                 SYM_UCMD_PTR(cmd)->eh_wait = ep;
 828         }
 829
 830         /* Try to proceed the operation we have been asked for */
 831         sts = -1;
 832         switch(op) {
 833         case SYM_EH_ABORT:
 834                 sts = sym_abort_scsiio(np, cmd, 1);
 835                 break;
 836         case SYM_EH_DEVICE_RESET:
 837                 sts = sym_reset_scsi_target(np, cmd->device->id);
 838                 break;
 839         case SYM_EH_BUS_RESET:
 840                 sym_reset_scsi_bus(np, 1);
 841                 sts = 0;
 842                 break;
 843         case SYM_EH_HOST_RESET:
 844                 sym_reset_scsi_bus(np, 0);
 845                 sym_start_up (np, 1);
 846                 sts = 0;
 847                 break;
 848         default:
 849                 break;
 850         }
 851
 852         /* On error, restore everything and cross fingers :) */
 853         if (sts) {
 854                 SYM_UCMD_PTR(cmd)->eh_wait = NULL;
 855                 cmd->scsi_done = ep->old_done;
 856                 to_do = SYM_EH_DO_IGNORE;
 857         }
 858
 859         ep->to_do = to_do;
 860         /* Complete the command with locks held as required by the driver */
 861         if (to_do == SYM_EH_DO_COMPLETE)
 862                 sym_xpt_done2(np, cmd, DID_ABORT);
 863
 864         /* Wait for completion with locks released, as required by kernel */
 865         if (to_do == SYM_EH_DO_WAIT) {
 866                 init_timer(&ep->timer);
 867                 ep->timer.expires = jiffies + (5*HZ);
 868                 ep->timer.function = sym_eh_timeout;
 869                 ep->timer.data = (u_long)cmd;
 870                 ep->timed_out = 1;      /* Be pessimistic for once :) */
 871                 add_timer(&ep->timer);
 872                 spin_unlock_irq(np->s.host->host_lock);
 873                 wait_for_completion(&ep->done);
 874                 spin_lock_irq(np->s.host->host_lock);
 875                 if (ep->timed_out)
 876                         sts = -2;
 877         }
 878         dev_warn(&cmd->device->sdev_gendev, "%s operation %s.\n", opname,
 879                         sts==0 ? "complete" :sts==-2 ? "timed-out" : "failed");
 880         return sts ? SCSI_FAILED : SCSI_SUCCESS;
 881 }
 882
 883
 884 /*
 885  * Error handlers called from the eh thread (one thread per HBA).
 886  */
 887 static int sym53c8xx_eh_abort_handler(struct scsi_cmnd *cmd)
 888 {
 889         int rc;
 890
 891         spin_lock_irq(cmd->device->host->host_lock);
 892         rc = sym_eh_handler(SYM_EH_ABORT, "ABORT", cmd);
 893         spin_unlock_irq(cmd->device->host->host_lock);
 894
 895         return rc;
 896 }
 897
 898 static int sym53c8xx_eh_device_reset_handler(struct scsi_cmnd *cmd)
 899 {
 900         int rc;
 901
 902         spin_lock_irq(cmd->device->host->host_lock);
 903         rc = sym_eh_handler(SYM_EH_DEVICE_RESET, "DEVICE RESET", cmd);
 904         spin_unlock_irq(cmd->device->host->host_lock);
 905
 906         return rc;
 907 }
 908
 909 static int sym53c8xx_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 910 {
 911         int rc;
 912
 913         spin_lock_irq(cmd->device->host->host_lock);
 914         rc = sym_eh_handler(SYM_EH_BUS_RESET, "BUS RESET", cmd);
 915         spin_unlock_irq(cmd->device->host->host_lock);
 916
 917         return rc;
 918 }
 919
 920 static int sym53c8xx_eh_host_reset_handler(struct scsi_cmnd *cmd)
 921 {
 922         int rc;
 923
 924         spin_lock_irq(cmd->device->host->host_lock);
 925         rc = sym_eh_handler(SYM_EH_HOST_RESET, "HOST RESET", cmd);
 926         spin_unlock_irq(cmd->device->host->host_lock);
 927
 928         return rc;
 929 }
 930
 931 /*
 932  *  Tune device queuing depth, according to various limits.
 933  */
 934 static void sym_tune_dev_queuing(struct sym_tcb *tp, int lun, u_short reqtags)
 935 {
 936         struct sym_lcb *lp = sym_lp(tp, lun);
 937         u_short oldtags;
 938
 939         if (!lp)
 940                 return;
 941
 942         oldtags = lp->s.reqtags;
 943
 944         if (reqtags > lp->s.scdev_depth)
 945                 reqtags = lp->s.scdev_depth;
 946
 947         lp->started_limit = reqtags ? reqtags : 2;
 948         lp->started_max   = 1;
 949         lp->s.reqtags     = reqtags;
 950
 951         if (reqtags != oldtags) {
 952                 dev_info(&tp->starget->dev,
 953                          "tagged command queuing %s, command queue depth %d.\n",
 954                           lp->s.reqtags ? "enabled" : "disabled",
 955                           lp->started_limit);
 956         }
 957 }
 958
 959 /*
 960  *  Linux select queue depths function
 961  */
 962 #define DEF_DEPTH       (sym_driver_setup.max_tag)
 963 #define ALL_TARGETS     -2
 964 #define NO_TARGET       -1
 965 #define ALL_LUNS        -2
 966 #define NO_LUN          -1
 967
 968 static int device_queue_depth(struct sym_hcb *np, int target, int lun)
 969 {
 970         int c, h, t, u, v;
 971         char *p = sym_driver_setup.tag_ctrl;
 972         char *ep;
 973
 974         h = -1;
 975         t = NO_TARGET;
 976         u = NO_LUN;
 977         while ((c = *p++) != 0) {
 978                 v = simple_strtoul(p, &ep, 0);
 979                 switch(c) {
 980                 case '/':
 981                         ++h;
 982                         t = ALL_TARGETS;
 983                         u = ALL_LUNS;
 984                         break;
 985                 case 't':
 986                         if (t != target)
 987                                 t = (target == v) ? v : NO_TARGET;
 988                         u = ALL_LUNS;
 989                         break;
 990                 case 'u':
 991                         if (u != lun)
 992                                 u = (lun == v) ? v : NO_LUN;
 993                         break;
 994                 case 'q':
 995                         if (h == np->s.unit &&
 996                                 (t == ALL_TARGETS || t == target) &&
 997                                 (u == ALL_LUNS    || u == lun))
 998                                 return v;
 999                         break;
1000                 case '-':
1001                         t = ALL_TARGETS;
1002                         u = ALL_LUNS;
1003                         break;
1004                 default:
1005                         break;
1006                 }
1007                 p = ep;
1008         }
1009         return DEF_DEPTH;
1010 }
1011
1012 static int sym53c8xx_slave_alloc(struct scsi_device *sdev)
1013 {
1014         struct sym_hcb *np = sym_get_hcb(sdev->host);
1015         struct sym_tcb *tp = &np->target[sdev->id];
1016         struct sym_lcb *lp;
1017
1018         if (sdev->id >= SYM_CONF_MAX_TARGET || sdev->lun >= SYM_CONF_MAX_LUN)
1019                 return -ENXIO;
1020
1021         /*
1022          * Fail the device init if the device is flagged NOSCAN at BOOT in
1023          * the NVRAM.  This may speed up boot and maintain coherency with
1024          * BIOS device numbering.  Clearing the flag allows the user to
1025          * rescan skipped devices later.  We also return an error for
1026          * devices not flagged for SCAN LUNS in the NVRAM since some single
1027          * lun devices behave badly when asked for a non zero LUN.
1028          */
1029
1030         if ((tp->usrflags & SYM_SCAN_BOOT_DISABLED) ||
1031             ((tp->usrflags & SYM_SCAN_LUNS_DISABLED) && sdev->lun != 0)) {
1032                 tp->usrflags &= ~SYM_SCAN_BOOT_DISABLED;
1033                 return -ENXIO;
1034         }
1035
1036         lp = sym_alloc_lcb(np, sdev->id, sdev->lun);
1037         if (!lp)
1038                 return -ENOMEM;
1039
1040         tp->starget = sdev->sdev_target;
1041         return 0;
1042 }
1043
1044 /*
1045  * Linux entry point for device queue sizing.
1046  */
1047 static int sym53c8xx_slave_configure(struct scsi_device *sdev)
1048 {
1049         struct sym_hcb *np = sym_get_hcb(sdev->host);
1050         struct sym_tcb *tp = &np->target[sdev->id];
1051         struct sym_lcb *lp = sym_lp(tp, sdev->lun);
1052         int reqtags, depth_to_use;
1053
1054         /*
1055          *  Get user flags.
1056          */
1057         lp->curr_flags = lp->user_flags;
1058
1059         /*
1060          *  Select queue depth from driver setup.
1061          *  Donnot use more than configured by user.
1062          *  Use at least 2.
1063          *  Donnot use more than our maximum.
1064          */
1065         reqtags = device_queue_depth(np, sdev->id, sdev->lun);
1066         if (reqtags > tp->usrtags)
1067                 reqtags = tp->usrtags;
1068         if (!sdev->tagged_supported)
1069                 reqtags = 0;
1070 #if 1 /* Avoid to locally queue commands for no good reasons */
1071         if (reqtags > SYM_CONF_MAX_TAG)
1072                 reqtags = SYM_CONF_MAX_TAG;
1073         depth_to_use = (reqtags ? reqtags : 2);
1074 #else
1075         depth_to_use = (reqtags ? SYM_CONF_MAX_TAG : 2);
1076 #endif
1077         scsi_adjust_queue_depth(sdev,
1078                                 (sdev->tagged_supported ?
1079                                  MSG_SIMPLE_TAG : 0),
1080                                 depth_to_use);
1081         lp->s.scdev_depth = depth_to_use;
1082         sym_tune_dev_queuing(tp, sdev->lun, reqtags);
1083
1084         if (!spi_initial_dv(sdev->sdev_target))
1085                 spi_dv_device(sdev);
1086
1087         return 0;
1088 }
1089
1090 static void sym53c8xx_slave_destroy(struct scsi_device *sdev)
1091 {
1092         struct sym_hcb *np = sym_get_hcb(sdev->host);
1093         struct sym_lcb *lp = sym_lp(&np->target[sdev->id], sdev->lun);
1094
1095         if (lp->itlq_tbl)
1096                 sym_mfree_dma(lp->itlq_tbl, SYM_CONF_MAX_TASK * 4, "ITLQ_TBL");
1097         kfree(lp->cb_tags);
1098         sym_mfree_dma(lp, sizeof(*lp), "LCB");
1099 }
1100
1101 /*
1102  *  Linux entry point for info() function
1103  */
1104 static const char *sym53c8xx_info (struct Scsi_Host *host)
1105 {
1106         return SYM_DRIVER_NAME;
1107 }
1108
1109
1110 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
1111 /*
1112  *  Proc file system stuff
1113  *
1114  *  A read operation returns adapter information.
1115  *  A write operation is a control command.
1116  *  The string is parsed in the driver code and the command is passed
1117  *  to the sym_usercmd() function.
1118  */
1119
1120 #ifdef SYM_LINUX_USER_COMMAND_SUPPORT
1121
1122 struct  sym_usrcmd {
1123         u_long  target;
1124         u_long  lun;
1125         u_long  data;
1126         u_long  cmd;
1127 };
1128
1129 #define UC_SETSYNC      10
1130 #define UC_SETTAGS      11
1131 #define UC_SETDEBUG     12
1132 #define UC_SETWIDE      14
1133 #define UC_SETFLAG      15
1134 #define UC_SETVERBOSE   17
1135 #define UC_RESETDEV     18
1136 #define UC_CLEARDEV     19
1137
1138 static void sym_exec_user_command (struct sym_hcb *np, struct sym_usrcmd *uc)
1139 {
1140         struct sym_tcb *tp;
1141         int t, l;
1142
1143         switch (uc->cmd) {
1144         case 0: return;
1145
1146 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1147         case UC_SETDEBUG:
1148                 sym_debug_flags = uc->data;
1149                 break;
1150 #endif
1151         case UC_SETVERBOSE:
1152                 np->verbose = uc->data;
1153                 break;
1154         default:
1155                 /*
1156                  * We assume that other commands apply to targets.
1157                  * This should always be the case and avoid the below
1158                  * 4 lines to be repeated 6 times.
1159                  */
1160                 for (t = 0; t < SYM_CONF_MAX_TARGET; t++) {
1161                         if (!((uc->target >> t) & 1))
1162                                 continue;
1163                         tp = &np->target[t];
1164
1165                         switch (uc->cmd) {
1166
1167                         case UC_SETSYNC:
1168                                 if (!uc->data || uc->data >= 255) {
1169                                         tp->tgoal.iu = tp->tgoal.dt =
1170                                                 tp->tgoal.qas = 0;
1171                                         tp->tgoal.offset = 0;
1172                                 } else if (uc->data <= 9 && np->minsync_dt) {
1173                                         if (uc->data < np->minsync_dt)
1174                                                 uc->data = np->minsync_dt;
1175                                         tp->tgoal.iu = tp->tgoal.dt =
1176                                                 tp->tgoal.qas = 1;
1177                                         tp->tgoal.width = 1;
1178                                         tp->tgoal.period = uc->data;
1179                                         tp->tgoal.offset = np->maxoffs_dt;
1180                                 } else {
1181                                         if (uc->data < np->minsync)
1182                                                 uc->data = np->minsync;
1183                                         tp->tgoal.iu = tp->tgoal.dt =
1184                                                 tp->tgoal.qas = 0;
1185                                         tp->tgoal.period = uc->data;
1186                                         tp->tgoal.offset = np->maxoffs;
1187                                 }
1188                                 tp->tgoal.check_nego = 1;
1189                                 break;
1190                         case UC_SETWIDE:
1191                                 tp->tgoal.width = uc->data ? 1 : 0;
1192                                 tp->tgoal.check_nego = 1;
1193                                 break;
1194                         case UC_SETTAGS:
1195                                 for (l = 0; l < SYM_CONF_MAX_LUN; l++)
1196                                         sym_tune_dev_queuing(tp, l, uc->data);
1197                                 break;
1198                         case UC_RESETDEV:
1199                                 tp->to_reset = 1;
1200                                 np->istat_sem = SEM;
1201                                 OUTB(np, nc_istat, SIGP|SEM);
1202                                 break;
1203                         case UC_CLEARDEV:
1204                                 for (l = 0; l < SYM_CONF_MAX_LUN; l++) {
1205                                         struct sym_lcb *lp = sym_lp(tp, l);
1206                                         if (lp) lp->to_clear = 1;
1207                                 }
1208                                 np->istat_sem = SEM;
1209                                 OUTB(np, nc_istat, SIGP|SEM);
1210                                 break;
1211                         case UC_SETFLAG:
1212                                 tp->usrflags = uc->data;
1213                                 break;
1214                         }
1215                 }
1216                 break;
1217         }
1218 }
1219
1220 static int skip_spaces(char *ptr, int len)
1221 {
1222         int cnt, c;
1223
1224         for (cnt = len; cnt > 0 && (c = *ptr++) && isspace(c); cnt--);
1225
1226         return (len - cnt);
1227 }
1228
1229 static int get_int_arg(char *ptr, int len, u_long *pv)
1230 {
1231         char *end;
1232
1233         *pv = simple_strtoul(ptr, &end, 10);
1234         return (end - ptr);
1235 }
1236
1237 static int is_keyword(char *ptr, int len, char *verb)
1238 {
1239         int verb_len = strlen(verb);
1240
1241         if (len >= verb_len && !memcmp(verb, ptr, verb_len))
1242                 return verb_len;
1243         else
1244                 return 0;
1245 }
1246
1247 #define SKIP_SPACES(ptr, len)                                           \
1248         if ((arg_len = skip_spaces(ptr, len)) < 1)                      \
1249                 return -EINVAL;                                         \
1250         ptr += arg_len; len -= arg_len;
1251
1252 #define GET_INT_ARG(ptr, len, v)                                        \
1253         if (!(arg_len = get_int_arg(ptr, len, &(v))))                   \
1254                 return -EINVAL;                                         \
1255         ptr += arg_len; len -= arg_len;
1256
1257
1258 /*
1259  * Parse a control command
1260  */
1261
1262 static int sym_user_command(struct sym_hcb *np, char *buffer, int length)
1263 {
1264         char *ptr       = buffer;
1265         int len         = length;
1266         struct sym_usrcmd cmd, *uc = &cmd;
1267         int             arg_len;
1268         u_long          target;
1269
1270         memset(uc, 0, sizeof(*uc));
1271
1272         if (len > 0 && ptr[len-1] == '\n')
1273                 --len;
1274
1275         if      ((arg_len = is_keyword(ptr, len, "setsync")) != 0)
1276                 uc->cmd = UC_SETSYNC;
1277         else if ((arg_len = is_keyword(ptr, len, "settags")) != 0)
1278                 uc->cmd = UC_SETTAGS;
1279         else if ((arg_len = is_keyword(ptr, len, "setverbose")) != 0)
1280                 uc->cmd = UC_SETVERBOSE;
1281         else if ((arg_len = is_keyword(ptr, len, "setwide")) != 0)
1282                 uc->cmd = UC_SETWIDE;
1283 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1284         else if ((arg_len = is_keyword(ptr, len, "setdebug")) != 0)
1285                 uc->cmd = UC_SETDEBUG;
1286 #endif
1287         else if ((arg_len = is_keyword(ptr, len, "setflag")) != 0)
1288                 uc->cmd = UC_SETFLAG;
1289         else if ((arg_len = is_keyword(ptr, len, "resetdev")) != 0)
1290                 uc->cmd = UC_RESETDEV;
1291         else if ((arg_len = is_keyword(ptr, len, "cleardev")) != 0)
1292                 uc->cmd = UC_CLEARDEV;
1293         else
1294                 arg_len = 0;
1295
1296 #ifdef DEBUG_PROC_INFO
1297 printk("sym_user_command: arg_len=%d, cmd=%ld\n", arg_len, uc->cmd);
1298 #endif
1299
1300         if (!arg_len)
1301                 return -EINVAL;
1302         ptr += arg_len; len -= arg_len;
1303
1304         switch(uc->cmd) {
1305         case UC_SETSYNC:
1306         case UC_SETTAGS:
1307         case UC_SETWIDE:
1308         case UC_SETFLAG:
1309         case UC_RESETDEV:
1310         case UC_CLEARDEV:
1311                 SKIP_SPACES(ptr, len);
1312                 if ((arg_len = is_keyword(ptr, len, "all")) != 0) {
1313                         ptr += arg_len; len -= arg_len;
1314                         uc->target = ~0;
1315                 } else {
1316                         GET_INT_ARG(ptr, len, target);
1317                         uc->target = (1<<target);
1318 #ifdef DEBUG_PROC_INFO
1319 printk("sym_user_command: target=%ld\n", target);
1320 #endif
1321                 }
1322                 break;
1323         }
1324
1325         switch(uc->cmd) {
1326         case UC_SETVERBOSE:
1327         case UC_SETSYNC:
1328         case UC_SETTAGS:
1329         case UC_SETWIDE:
1330                 SKIP_SPACES(ptr, len);
1331                 GET_INT_ARG(ptr, len, uc->data);
1332 #ifdef DEBUG_PROC_INFO
1333 printk("sym_user_command: data=%ld\n", uc->data);
1334 #endif
1335                 break;
1336 #ifdef SYM_LINUX_DEBUG_CONTROL_SUPPORT
1337         case UC_SETDEBUG:
1338                 while (len > 0) {
1339                         SKIP_SPACES(ptr, len);
1340                         if      ((arg_len = is_keyword(ptr, len, "alloc")))
1341                                 uc->data |= DEBUG_ALLOC;
1342                         else if ((arg_len = is_keyword(ptr, len, "phase")))
1343                                 uc->data |= DEBUG_PHASE;
1344                         else if ((arg_len = is_keyword(ptr, len, "queue")))
1345                                 uc->data |= DEBUG_QUEUE;
1346                         else if ((arg_len = is_keyword(ptr, len, "result")))
1347                                 uc->data |= DEBUG_RESULT;
1348                         else if ((arg_len = is_keyword(ptr, len, "scatter")))
1349                                 uc->data |= DEBUG_SCATTER;
1350                         else if ((arg_len = is_keyword(ptr, len, "script")))
1351                                 uc->data |= DEBUG_SCRIPT;
1352                         else if ((arg_len = is_keyword(ptr, len, "tiny")))
1353                                 uc->data |= DEBUG_TINY;
1354                         else if ((arg_len = is_keyword(ptr, len, "timing")))
1355                                 uc->data |= DEBUG_TIMING;
1356                         else if ((arg_len = is_keyword(ptr, len, "nego")))
1357                                 uc->data |= DEBUG_NEGO;
1358                         else if ((arg_len = is_keyword(ptr, len, "tags")))
1359                                 uc->data |= DEBUG_TAGS;
1360                         else if ((arg_len = is_keyword(ptr, len, "pointer")))
1361                                 uc->data |= DEBUG_POINTER;
1362                         else
1363                                 return -EINVAL;
1364                         ptr += arg_len; len -= arg_len;
1365                 }
1366 #ifdef DEBUG_PROC_INFO
1367 printk("sym_user_command: data=%ld\n", uc->data);
1368 #endif
1369                 break;
1370 #endif /* SYM_LINUX_DEBUG_CONTROL_SUPPORT */
1371         case UC_SETFLAG:
1372                 while (len > 0) {
1373                         SKIP_SPACES(ptr, len);
1374                         if      ((arg_len = is_keyword(ptr, len, "no_disc")))
1375                                 uc->data &= ~SYM_DISC_ENABLED;
1376                         else
1377                                 return -EINVAL;
1378                         ptr += arg_len; len -= arg_len;
1379                 }
1380                 break;
1381         default:
1382                 break;
1383         }
1384
1385         if (len)
1386                 return -EINVAL;
1387         else {
1388                 unsigned long flags;
1389
1390                 spin_lock_irqsave(np->s.host->host_lock, flags);
1391                 sym_exec_user_command (np, uc);
1392                 spin_unlock_irqrestore(np->s.host->host_lock, flags);
1393         }
1394         return length;
1395 }
1396
1397 #endif  /* SYM_LINUX_USER_COMMAND_SUPPORT */
1398
1399
1400 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1401 /*
1402  *  Informations through the proc file system.
1403  */
1404 struct info_str {
1405         char *buffer;
1406         int length;
1407         int offset;
1408         int pos;
1409 };
1410
1411 static void copy_mem_info(struct info_str *info, char *data, int len)
1412 {
1413         if (info->pos + len > info->length)
1414                 len = info->length - info->pos;
1415
1416         if (info->pos + len < info->offset) {
1417                 info->pos += len;
1418                 return;
1419         }
1420         if (info->pos < info->offset) {
1421                 data += (info->offset - info->pos);
1422                 len  -= (info->offset - info->pos);
1423         }
1424
1425         if (len > 0) {
1426                 memcpy(info->buffer + info->pos, data, len);
1427                 info->pos += len;
1428         }
1429 }
1430
1431 static int copy_info(struct info_str *info, char *fmt, ...)
1432 {
1433         va_list args;
1434         char buf[81];
1435         int len;
1436
1437         va_start(args, fmt);
1438         len = vsprintf(buf, fmt, args);
1439         va_end(args);
1440
1441         copy_mem_info(info, buf, len);
1442         return len;
1443 }
1444
1445 /*
1446  *  Copy formatted information into the input buffer.
1447  */
1448 static int sym_host_info(struct sym_hcb *np, char *ptr, off_t offset, int len)
1449 {
1450         struct info_str info;
1451
1452         info.buffer     = ptr;
1453         info.length     = len;
1454         info.offset     = offset;
1455         info.pos        = 0;
1456
1457         copy_info(&info, "Chip " NAME53C "%s, device id 0x%x, "
1458                          "revision id 0x%x\n",
1459                          np->s.chip_name, np->device_id, np->revision_id);
1460         copy_info(&info, "At PCI address %s, IRQ " IRQ_FMT "\n",
1461                 pci_name(np->s.device), IRQ_PRM(np->s.irq));
1462         copy_info(&info, "Min. period factor %d, %s SCSI BUS%s\n",
1463                          (int) (np->minsync_dt ? np->minsync_dt : np->minsync),
1464                          np->maxwide ? "Wide" : "Narrow",
1465                          np->minsync_dt ? ", DT capable" : "");
1466
1467         copy_info(&info, "Max. started commands %d, "
1468                          "max. commands per LUN %d\n",
1469                          SYM_CONF_MAX_START, SYM_CONF_MAX_TAG);
1470
1471         return info.pos > info.offset? info.pos - info.offset : 0;
1472 }
1473 #endif /* SYM_LINUX_USER_INFO_SUPPORT */
1474
1475 /*
1476  *  Entry point of the scsi proc fs of the driver.
1477  *  - func = 0 means read  (returns adapter infos)
1478  *  - func = 1 means write (not yet merget from sym53c8xx)
1479  */
1480 static int sym53c8xx_proc_info(struct Scsi_Host *host, char *buffer,
1481                         char **start, off_t offset, int length, int func)
1482 {
1483         struct sym_hcb *np = sym_get_hcb(host);
1484         int retv;
1485
1486         if (func) {
1487 #ifdef  SYM_LINUX_USER_COMMAND_SUPPORT
1488                 retv = sym_user_command(np, buffer, length);
1489 #else
1490                 retv = -EINVAL;
1491 #endif
1492         } else {
1493                 if (start)
1494                         *start = buffer;
1495 #ifdef SYM_LINUX_USER_INFO_SUPPORT
1496                 retv = sym_host_info(np, buffer, offset, length);
1497 #else
1498                 retv = -EINVAL;
1499 #endif
1500         }
1501
1502         return retv;
1503 }
1504 #endif /* SYM_LINUX_PROC_INFO_SUPPORT */
1505
1506 /*
1507  *      Free controller resources.
1508  */
1509 static void sym_free_resources(struct sym_hcb *np, struct pci_dev *pdev)
1510 {
1511         /*
1512          *  Free O/S specific resources.
1513          */
1514         if (np->s.irq)
1515                 free_irq(np->s.irq, np);
1516         if (np->s.ioaddr)
1517                 pci_iounmap(pdev, np->s.ioaddr);
1518         if (np->s.ramaddr)
1519                 pci_iounmap(pdev, np->s.ramaddr);
1520         /*
1521          *  Free O/S independent resources.
1522          */
1523         sym_hcb_free(np);
1524
1525         sym_mfree_dma(np, sizeof(*np), "HCB");
1526 }
1527
1528 /*
1529  *  Ask/tell the system about DMA addressing.
1530  */
1531 static int sym_setup_bus_dma_mask(struct sym_hcb *np)
1532 {
1533 #if SYM_CONF_DMA_ADDRESSING_MODE > 0
1534 #if   SYM_CONF_DMA_ADDRESSING_MODE == 1
1535 #define DMA_DAC_MASK    0x000000ffffffffffULL /* 40-bit */
1536 #elif SYM_CONF_DMA_ADDRESSING_MODE == 2
1537 #define DMA_DAC_MASK    DMA_64BIT_MASK
1538 #endif
1539         if ((np->features & FE_DAC) &&
1540                         !pci_set_dma_mask(np->s.device, DMA_DAC_MASK)) {
1541                 np->use_dac = 1;
1542                 return 0;
1543         }
1544 #endif
1545
1546         if (!pci_set_dma_mask(np->s.device, DMA_32BIT_MASK))
1547                 return 0;
1548
1549         printf_warning("%s: No suitable DMA available\n", sym_name(np));
1550         return -1;
1551 }
1552
1553 /*
1554  *  Host attach and initialisations.
1555  *
1556  *  Allocate host data and ncb structure.
1557  *  Remap MMIO region.
1558  *  Do chip initialization.
1559  *  If all is OK, install interrupt handling and
1560  *  start the timer daemon.
1561  */
1562 static struct Scsi_Host * __devinit sym_attach(struct scsi_host_template *tpnt,
1563                 int unit, struct sym_device *dev)
1564 {
1565         struct host_data *host_data;
1566         struct sym_hcb *np = NULL;
1567         struct Scsi_Host *instance = NULL;
1568         struct pci_dev *pdev = dev->pdev;
1569         unsigned long flags;
1570         struct sym_fw *fw;
1571
1572         printk(KERN_INFO
1573                 "sym%d: <%s> rev 0x%x at pci %s irq " IRQ_FMT "\n",
1574                 unit, dev->chip.name, dev->chip.revision_id,
1575                 pci_name(pdev), IRQ_PRM(pdev->irq));
1576
1577         /*
1578          *  Get the firmware for this chip.
1579          */
1580         fw = sym_find_firmware(&dev->chip);
1581         if (!fw)
1582                 goto attach_failed;
1583
1584         /*
1585          *      Allocate host_data structure
1586          */
1587         instance = scsi_host_alloc(tpnt, sizeof(*host_data));
1588         if (!instance)
1589                 goto attach_failed;
1590         host_data = (struct host_data *) instance->hostdata;
1591
1592         /*
1593          *  Allocate immediately the host control block,
1594          *  since we are only expecting to succeed. :)
1595          *  We keep track in the HCB of all the resources that
1596          *  are to be released on error.
1597          */
1598         np = __sym_calloc_dma(&pdev->dev, sizeof(*np), "HCB");
1599         if (!np)
1600                 goto attach_failed;
1601         np->s.device = pdev;
1602         np->bus_dmat = &pdev->dev; /* Result in 1 DMA pool per HBA */
1603         host_data->ncb = np;
1604         np->s.host = instance;
1605
1606         pci_set_drvdata(pdev, np);
1607
1608         /*
1609          *  Copy some useful infos to the HCB.
1610          */
1611         np->hcb_ba      = vtobus(np);
1612         np->verbose     = sym_driver_setup.verbose;
1613         np->s.device    = pdev;
1614         np->s.unit      = unit;
1615         np->device_id   = dev->chip.device_id;
1616         np->revision_id = dev->chip.revision_id;
1617         np->features    = dev->chip.features;
1618         np->clock_divn  = dev->chip.nr_divisor;
1619         np->maxoffs     = dev->chip.offset_max;
1620         np->maxburst    = dev->chip.burst_max;
1621         np->myaddr      = dev->host_id;
1622
1623         /*
1624          *  Edit its name.
1625          */
1626         strlcpy(np->s.chip_name, dev->chip.name, sizeof(np->s.chip_name));
1627         sprintf(np->s.inst_name, "sym%d", np->s.unit);
1628
1629         if (sym_setup_bus_dma_mask(np))
1630                 goto attach_failed;
1631
1632         /*
1633          *  Try to map the controller chip to
1634          *  virtual and physical memory.
1635          */
1636         np->mmio_ba = (u32)dev->mmio_base;
1637         np->s.ioaddr    = dev->s.ioaddr;
1638         np->s.ramaddr   = dev->s.ramaddr;
1639         np->s.io_ws = (np->features & FE_IO256) ? 256 : 128;
1640
1641         /*
1642          *  Map on-chip RAM if present and supported.
1643          */
1644         if (!(np->features & FE_RAM))
1645                 dev->ram_base = 0;
1646         if (dev->ram_base) {
1647                 np->ram_ba = (u32)dev->ram_base;
1648                 np->ram_ws = (np->features & FE_RAM8K) ? 8192 : 4096;
1649         }
1650
1651         if (sym_hcb_attach(instance, fw, dev->nvram))
1652                 goto attach_failed;
1653
1654         /*
1655          *  Install the interrupt handler.
1656          *  If we synchonize the C code with SCRIPTS on interrupt,
1657          *  we do not want to share the INTR line at all.
1658          */
1659         if (request_irq(pdev->irq, sym53c8xx_intr, SA_SHIRQ, NAME53C8XX, np)) {
1660                 printf_err("%s: request irq %d failure\n",
1661                         sym_name(np), pdev->irq);
1662                 goto attach_failed;
1663         }
1664         np->s.irq = pdev->irq;
1665
1666         /*
1667          *  After SCSI devices have been opened, we cannot
1668          *  reset the bus safely, so we do it here.
1669          */
1670         spin_lock_irqsave(instance->host_lock, flags);
1671         if (sym_reset_scsi_bus(np, 0))
1672                 goto reset_failed;
1673
1674         /*
1675          *  Start the SCRIPTS.
1676          */
1677         sym_start_up (np, 1);
1678
1679         /*
1680          *  Start the timer daemon
1681          */
1682         init_timer(&np->s.timer);
1683         np->s.timer.data     = (unsigned long) np;
1684         np->s.timer.function = sym53c8xx_timer;
1685         np->s.lasttime=0;
1686         sym_timer (np);
1687
1688         /*
1689          *  Fill Linux host instance structure
1690          *  and return success.
1691          */
1692         instance->max_channel   = 0;
1693         instance->this_id       = np->myaddr;
1694         instance->max_id        = np->maxwide ? 16 : 8;
1695         instance->max_lun       = SYM_CONF_MAX_LUN;
1696         instance->unique_id     = pci_resource_start(pdev, 0);
1697         instance->cmd_per_lun   = SYM_CONF_MAX_TAG;
1698         instance->can_queue     = (SYM_CONF_MAX_START-2);
1699         instance->sg_tablesize  = SYM_CONF_MAX_SG;
1700         instance->max_cmd_len   = 16;
1701         BUG_ON(sym2_transport_template == NULL);
1702         instance->transportt    = sym2_transport_template;
1703
1704         spin_unlock_irqrestore(instance->host_lock, flags);
1705
1706         return instance;
1707
1708  reset_failed:
1709         printf_err("%s: FATAL ERROR: CHECK SCSI BUS - CABLES, "
1710                    "TERMINATION, DEVICE POWER etc.!\n", sym_name(np));
1711         spin_unlock_irqrestore(instance->host_lock, flags);
1712  attach_failed:
1713         if (!instance)
1714                 return NULL;
1715         printf_info("%s: giving up ...\n", sym_name(np));
1716         if (np)
1717                 sym_free_resources(np, pdev);
1718         scsi_host_put(instance);
1719
1720         return NULL;
1721  }
1722
1723
1724 /*
1725  *    Detect and try to read SYMBIOS and TEKRAM NVRAM.
1726  */
1727 #if SYM_CONF_NVRAM_SUPPORT
1728 static void __devinit sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1729 {
1730         devp->nvram = nvp;
1731         devp->device_id = devp->chip.device_id;
1732         nvp->type = 0;
1733
1734         sym_read_nvram(devp, nvp);
1735 }
1736 #else
1737 static inline void sym_get_nvram(struct sym_device *devp, struct sym_nvram *nvp)
1738 {
1739 }
1740 #endif  /* SYM_CONF_NVRAM_SUPPORT */
1741
1742 static int __devinit sym_check_supported(struct sym_device *device)
1743 {
1744         struct sym_chip *chip;
1745         struct pci_dev *pdev = device->pdev;
1746         u_char revision;
1747         unsigned long io_port = pci_resource_start(pdev, 0);
1748         int i;
1749
1750         /*
1751          *  If user excluded this chip, do not initialize it.
1752          *  I hate this code so much.  Must kill it.
1753          */
1754         if (io_port) {
1755                 for (i = 0 ; i < 8 ; i++) {
1756                         if (sym_driver_setup.excludes[i] == io_port)
1757                                 return -ENODEV;
1758                 }
1759         }
1760
1761         /*
1762          * Check if the chip is supported.  Then copy the chip description
1763          * to our device structure so we can make it match the actual device
1764          * and options.
1765          */
1766         pci_read_config_byte(pdev, PCI_CLASS_REVISION, &revision);
1767         chip = sym_lookup_chip_table(pdev->device, revision);
1768         if (!chip) {
1769                 dev_info(&pdev->dev, "device not supported\n");
1770                 return -ENODEV;
1771         }
1772         memcpy(&device->chip, chip, sizeof(device->chip));
1773         device->chip.revision_id = revision;
1774
1775         return 0;
1776 }
1777
1778 /*
1779  * Ignore Symbios chips controlled by various RAID controllers.
1780  * These controllers set value 0x52414944 at RAM end - 16.
1781  */
1782 static int __devinit sym_check_raid(struct sym_device *device)
1783 {
1784         unsigned int ram_size, ram_val;
1785
1786         if (!device->s.ramaddr)
1787                 return 0;
1788
1789         if (device->chip.features & FE_RAM8K)
1790                 ram_size = 8192;
1791         else
1792                 ram_size = 4096;
1793
1794         ram_val = readl(device->s.ramaddr + ram_size - 16);
1795         if (ram_val != 0x52414944)
1796                 return 0;
1797
1798         dev_info(&device->pdev->dev,
1799                         "not initializing, driven by RAID controller.\n");
1800         return -ENODEV;
1801 }
1802
1803 static int __devinit sym_set_workarounds(struct sym_device *device)
1804 {
1805         struct sym_chip *chip = &device->chip;
1806         struct pci_dev *pdev = device->pdev;
1807         u_short status_reg;
1808
1809         /*
1810          *  (ITEM 12 of a DEL about the 896 I haven't yet).
1811          *  We must ensure the chip will use WRITE AND INVALIDATE.
1812          *  The revision number limit is for now arbitrary.
1813          */
1814         if (pdev->device == PCI_DEVICE_ID_NCR_53C896 && chip->revision_id < 0x4) {
1815                 chip->features  |= (FE_WRIE | FE_CLSE);
1816         }
1817
1818         /* If the chip can do Memory Write Invalidate, enable it */
1819         if (chip->features & FE_WRIE) {
1820                 if (pci_set_mwi(pdev))
1821                         return -ENODEV;
1822         }
1823
1824         /*
1825          *  Work around for errant bit in 895A. The 66Mhz
1826          *  capable bit is set erroneously. Clear this bit.
1827          *  (Item 1 DEL 533)
1828          *
1829          *  Make sure Config space and Features agree.
1830          *
1831          *  Recall: writes are not normal to status register -
1832          *  write a 1 to clear and a 0 to leave unchanged.
1833          *  Can only reset bits.
1834          */
1835         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1836         if (chip->features & FE_66MHZ) {
1837                 if (!(status_reg & PCI_STATUS_66MHZ))
1838                         chip->features &= ~FE_66MHZ;
1839         } else {
1840                 if (status_reg & PCI_STATUS_66MHZ) {
1841                         status_reg = PCI_STATUS_66MHZ;
1842                         pci_write_config_word(pdev, PCI_STATUS, status_reg);
1843                         pci_read_config_word(pdev, PCI_STATUS, &status_reg);
1844                 }
1845         }
1846
1847         return 0;
1848 }
1849
1850 /*
1851  *  Read and check the PCI configuration for any detected NCR
1852  *  boards and save data for attaching after all boards have
1853  *  been detected.
1854  */
1855 static void __devinit
1856 sym_init_device(struct pci_dev *pdev, struct sym_device *device)
1857 {
1858         int i;
1859
1860         device->host_id = SYM_SETUP_HOST_ID;
1861         device->pdev = pdev;
1862
1863         i = pci_get_base_address(pdev, 1, &device->mmio_base);
1864         pci_get_base_address(pdev, i, &device->ram_base);
1865
1866 #ifndef CONFIG_SCSI_SYM53C8XX_IOMAPPED
1867         if (device->mmio_base)
1868                 device->s.ioaddr = pci_iomap(pdev, 1,
1869                                                 pci_resource_len(pdev, 1));
1870 #endif
1871         if (!device->s.ioaddr)
1872                 device->s.ioaddr = pci_iomap(pdev, 0,
1873                                                 pci_resource_len(pdev, 0));
1874         if (device->ram_base)
1875                 device->s.ramaddr = pci_iomap(pdev, i,
1876                                                 pci_resource_len(pdev, i));
1877 }
1878
1879 /*
1880  * The NCR PQS and PDS cards are constructed as a DEC bridge
1881  * behind which sits a proprietary NCR memory controller and
1882  * either four or two 53c875s as separate devices.  We can tell
1883  * if an 875 is part of a PQS/PDS or not since if it is, it will
1884  * be on the same bus as the memory controller.  In its usual
1885  * mode of operation, the 875s are slaved to the memory
1886  * controller for all transfers.  To operate with the Linux
1887  * driver, the memory controller is disabled and the 875s
1888  * freed to function independently.  The only wrinkle is that
1889  * the preset SCSI ID (which may be zero) must be read in from
1890  * a special configuration space register of the 875.
1891  */
1892 static void sym_config_pqs(struct pci_dev *pdev, struct sym_device *sym_dev)
1893 {
1894         int slot;
1895         u8 tmp;
1896
1897         for (slot = 0; slot < 256; slot++) {
1898                 struct pci_dev *memc = pci_get_slot(pdev->bus, slot);
1899
1900                 if (!memc || memc->vendor != 0x101a || memc->device == 0x0009) {
1901                         pci_dev_put(memc);
1902                         continue;
1903                 }
1904
1905                 /* bit 1: allow individual 875 configuration */
1906                 pci_read_config_byte(memc, 0x44, &tmp);
1907                 if ((tmp & 0x2) == 0) {
1908                         tmp |= 0x2;
1909                         pci_write_config_byte(memc, 0x44, tmp);
1910                 }
1911
1912                 /* bit 2: drive individual 875 interrupts to the bus */
1913                 pci_read_config_byte(memc, 0x45, &tmp);
1914                 if ((tmp & 0x4) == 0) {
1915                         tmp |= 0x4;
1916                         pci_write_config_byte(memc, 0x45, tmp);
1917                 }
1918
1919                 pci_dev_put(memc);
1920                 break;
1921         }
1922
1923         pci_read_config_byte(pdev, 0x84, &tmp);
1924         sym_dev->host_id = tmp;
1925 }
1926
1927 /*
1928  *  Called before unloading the module.
1929  *  Detach the host.
1930  *  We have to free resources and halt the NCR chip.
1931  */
1932 static int sym_detach(struct sym_hcb *np, struct pci_dev *pdev)
1933 {
1934         printk("%s: detaching ...\n", sym_name(np));
1935
1936         del_timer_sync(&np->s.timer);
1937
1938         /*
1939          * Reset NCR chip.
1940          * We should use sym_soft_reset(), but we don't want to do
1941          * so, since we may not be safe if interrupts occur.
1942          */
1943         printk("%s: resetting chip\n", sym_name(np));
1944         OUTB(np, nc_istat, SRST);
1945         INB(np, nc_mbox1);
1946         udelay(10);
1947         OUTB(np, nc_istat, 0);
1948
1949         sym_free_resources(np, pdev);
1950
1951         return 1;
1952 }
1953
1954 /*
1955  * Driver host template.
1956  */
1957 static struct scsi_host_template sym2_template = {
1958         .module                 = THIS_MODULE,
1959         .name                   = "sym53c8xx",
1960         .info                   = sym53c8xx_info,
1961         .queuecommand           = sym53c8xx_queue_command,
1962         .slave_alloc            = sym53c8xx_slave_alloc,
1963         .slave_configure        = sym53c8xx_slave_configure,
1964         .slave_destroy          = sym53c8xx_slave_destroy,
1965         .eh_abort_handler       = sym53c8xx_eh_abort_handler,
1966         .eh_device_reset_handler = sym53c8xx_eh_device_reset_handler,
1967         .eh_bus_reset_handler   = sym53c8xx_eh_bus_reset_handler,
1968         .eh_host_reset_handler  = sym53c8xx_eh_host_reset_handler,
1969         .this_id                = 7,
1970         .use_clustering         = DISABLE_CLUSTERING,
1971 #ifdef SYM_LINUX_PROC_INFO_SUPPORT
1972         .proc_info              = sym53c8xx_proc_info,
1973         .proc_name              = NAME53C8XX,
1974 #endif
1975 };
1976
1977 static int attach_count;
1978
1979 static int __devinit sym2_probe(struct pci_dev *pdev,
1980                                 const struct pci_device_id *ent)
1981 {
1982         struct sym_device sym_dev;
1983         struct sym_nvram nvram;
1984         struct Scsi_Host *instance;
1985
1986         memset(&sym_dev, 0, sizeof(sym_dev));
1987         memset(&nvram, 0, sizeof(nvram));
1988
1989         if (pci_enable_device(pdev))
1990                 goto leave;
1991
1992         pci_set_master(pdev);
1993
1994         if (pci_request_regions(pdev, NAME53C8XX))
1995                 goto disable;
1996
1997         sym_init_device(pdev, &sym_dev);
1998         if (sym_check_supported(&sym_dev))
1999                 goto free;
2000
2001         if (sym_check_raid(&sym_dev))
2002                 goto leave;     /* Don't disable the device */
2003
2004         if (sym_set_workarounds(&sym_dev))
2005                 goto free;
2006
2007         sym_config_pqs(pdev, &sym_dev);
2008
2009         sym_get_nvram(&sym_dev, &nvram);
2010
2011         instance = sym_attach(&sym2_template, attach_count, &sym_dev);
2012         if (!instance)
2013                 goto free;
2014
2015         if (scsi_add_host(instance, &pdev->dev))
2016                 goto detach;
2017         scsi_scan_host(instance);
2018
2019         attach_count++;
2020
2021         return 0;
2022
2023  detach:
2024         sym_detach(pci_get_drvdata(pdev), pdev);
2025  free:
2026         pci_release_regions(pdev);
2027  disable:
2028         pci_disable_device(pdev);
2029  leave:
2030         return -ENODEV;
2031 }
2032
2033 static void __devexit sym2_remove(struct pci_dev *pdev)
2034 {
2035         struct sym_hcb *np = pci_get_drvdata(pdev);
2036         struct Scsi_Host *host = np->s.host;
2037
2038         scsi_remove_host(host);
2039         scsi_host_put(host);
2040
2041         sym_detach(np, pdev);
2042
2043         pci_release_regions(pdev);
2044         pci_disable_device(pdev);
2045
2046         attach_count--;
2047 }
2048
2049 static void sym2_get_signalling(struct Scsi_Host *shost)
2050 {
2051         struct sym_hcb *np = sym_get_hcb(shost);
2052         enum spi_signal_type type;
2053
2054         switch (np->scsi_mode) {
2055         case SMODE_SE:
2056                 type = SPI_SIGNAL_SE;
2057                 break;
2058         case SMODE_LVD:
2059                 type = SPI_SIGNAL_LVD;
2060                 break;
2061         case SMODE_HVD:
2062                 type = SPI_SIGNAL_HVD;
2063                 break;
2064         default:
2065                 type = SPI_SIGNAL_UNKNOWN;
2066                 break;
2067         }
2068         spi_signalling(shost) = type;
2069 }
2070
2071 static void sym2_set_offset(struct scsi_target *starget, int offset)
2072 {
2073         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2074         struct sym_hcb *np = sym_get_hcb(shost);
2075         struct sym_tcb *tp = &np->target[starget->id];
2076
2077         tp->tgoal.offset = offset;
2078         tp->tgoal.check_nego = 1;
2079 }
2080
2081 static void sym2_set_period(struct scsi_target *starget, int period)
2082 {
2083         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2084         struct sym_hcb *np = sym_get_hcb(shost);
2085         struct sym_tcb *tp = &np->target[starget->id];
2086
2087         /* have to have DT for these transfers, but DT will also
2088          * set width, so check that this is allowed */
2089         if (period <= np->minsync && spi_width(starget))
2090                 tp->tgoal.dt = 1;
2091
2092         tp->tgoal.period = period;
2093         tp->tgoal.check_nego = 1;
2094 }
2095
2096 static void sym2_set_width(struct scsi_target *starget, int width)
2097 {
2098         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2099         struct sym_hcb *np = sym_get_hcb(shost);
2100         struct sym_tcb *tp = &np->target[starget->id];
2101
2102         /* It is illegal to have DT set on narrow transfers.  If DT is
2103          * clear, we must also clear IU and QAS.  */
2104         if (width == 0)
2105                 tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
2106
2107         tp->tgoal.width = width;
2108         tp->tgoal.check_nego = 1;
2109 }
2110
2111 static void sym2_set_dt(struct scsi_target *starget, int dt)
2112 {
2113         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2114         struct sym_hcb *np = sym_get_hcb(shost);
2115         struct sym_tcb *tp = &np->target[starget->id];
2116
2117         /* We must clear QAS and IU if DT is clear */
2118         if (dt)
2119                 tp->tgoal.dt = 1;
2120         else
2121                 tp->tgoal.iu = tp->tgoal.dt = tp->tgoal.qas = 0;
2122         tp->tgoal.check_nego = 1;
2123 }
2124
2125 #if 0
2126 static void sym2_set_iu(struct scsi_target *starget, int iu)
2127 {
2128         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2129         struct sym_hcb *np = sym_get_hcb(shost);
2130         struct sym_tcb *tp = &np->target[starget->id];
2131
2132         if (iu)
2133                 tp->tgoal.iu = tp->tgoal.dt = 1;
2134         else
2135                 tp->tgoal.iu = 0;
2136         tp->tgoal.check_nego = 1;
2137 }
2138
2139 static void sym2_set_qas(struct scsi_target *starget, int qas)
2140 {
2141         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
2142         struct sym_hcb *np = sym_get_hcb(shost);
2143         struct sym_tcb *tp = &np->target[starget->id];
2144
2145         if (qas)
2146                 tp->tgoal.dt = tp->tgoal.qas = 1;
2147         else
2148                 tp->tgoal.qas = 0;
2149         tp->tgoal.check_nego = 1;
2150 }
2151 #endif
2152
2153 static struct spi_function_template sym2_transport_functions = {
2154         .set_offset     = sym2_set_offset,
2155         .show_offset    = 1,
2156         .set_period     = sym2_set_period,
2157         .show_period    = 1,
2158         .set_width      = sym2_set_width,
2159         .show_width     = 1,
2160         .set_dt         = sym2_set_dt,
2161         .show_dt        = 1,
2162 #if 0
2163         .set_iu         = sym2_set_iu,
2164         .show_iu        = 1,
2165         .set_qas        = sym2_set_qas,
2166         .show_qas       = 1,
2167 #endif
2168         .get_signalling = sym2_get_signalling,
2169 };
2170
2171 static struct pci_device_id sym2_id_table[] __devinitdata = {
2172         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C810,
2173           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2174         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C820,
2175           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2176         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C825,
2177           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2178         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C815,
2179           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2180         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C810AP,
2181           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2182         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C860,
2183           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2184         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1510,
2185           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2186         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C896,
2187           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2188         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C895,
2189           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2190         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C885,
2191           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2192         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875,
2193           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2194         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C1510,
2195           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL }, /* new */
2196         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C895A,
2197           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2198         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C875A,
2199           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2200         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_33,
2201           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2202         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_LSI_53C1010_66,
2203           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2204         { PCI_VENDOR_ID_LSI_LOGIC, PCI_DEVICE_ID_NCR_53C875J,
2205           PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0UL },
2206         { 0, }
2207 };
2208
2209 MODULE_DEVICE_TABLE(pci, sym2_id_table);
2210
2211 static struct pci_driver sym2_driver = {
2212         .name           = NAME53C8XX,
2213         .id_table       = sym2_id_table,
2214         .probe          = sym2_probe,
2215         .remove         = __devexit_p(sym2_remove),
2216 };
2217
2218 static int __init sym2_init(void)
2219 {
2220         int error;
2221
2222         sym2_setup_params();
2223         sym2_transport_template = spi_attach_transport(&sym2_transport_functions);
2224         if (!sym2_transport_template)
2225                 return -ENODEV;
2226
2227         error = pci_register_driver(&sym2_driver);
2228         if (error)
2229                 spi_release_transport(sym2_transport_template);
2230         return error;
2231 }
2232
2233 static void __exit sym2_exit(void)
2234 {
2235         pci_unregister_driver(&sym2_driver);
2236         spi_release_transport(sym2_transport_template);
2237 }
2238
2239 module_init(sym2_init);
2240 module_exit(sym2_exit);