drivers/scsi/53c700.c

   1 /* -*- mode: c; c-basic-offset: 8 -*- */
   2
   3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
   4  *
   5  * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
   6 **-----------------------------------------------------------------------------
   7 **
   8 **  This program is free software; you can redistribute it and/or modify
   9 **  it under the terms of the GNU General Public License as published by
  10 **  the Free Software Foundation; either version 2 of the License, or
  11 **  (at your option) any later version.
  12 **
  13 **  This program is distributed in the hope that it will be useful,
  14 **  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 **  GNU General Public License for more details.
  17 **
  18 **  You should have received a copy of the GNU General Public License
  19 **  along with this program; if not, write to the Free Software
  20 **  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 **
  22 **-----------------------------------------------------------------------------
  23  */
  24
  25 /* Notes:
  26  *
  27  * This driver is designed exclusively for these chips (virtually the
  28  * earliest of the scripts engine chips).  They need their own drivers
  29  * because they are missing so many of the scripts and snazzy register
  30  * features of their elder brothers (the 710, 720 and 770).
  31  *
  32  * The 700 is the lowliest of the line, it can only do async SCSI.
  33  * The 700-66 can at least do synchronous SCSI up to 10MHz.
  34  *
  35  * The 700 chip has no host bus interface logic of its own.  However,
  36  * it is usually mapped to a location with well defined register
  37  * offsets.  Therefore, if you can determine the base address and the
  38  * irq your board incorporating this chip uses, you can probably use
  39  * this driver to run it (although you'll probably have to write a
  40  * minimal wrapper for the purpose---see the NCR_D700 driver for
  41  * details about how to do this).
  42  *
  43  *
  44  * TODO List:
  45  *
  46  * 1. Better statistics in the proc fs
  47  *
  48  * 2. Implement message queue (queues SCSI messages like commands) and make
  49  *    the abort and device reset functions use them.
  50  * */
  51
  52 /* CHANGELOG
  53  *
  54  * Version 2.8
  55  *
  56  * Fixed bad bug affecting tag starvation processing (previously the
  57  * driver would hang the system if too many tags starved.  Also fixed
  58  * bad bug having to do with 10 byte command processing and REQUEST
  59  * SENSE (the command would loop forever getting a transfer length
  60  * mismatch in the CMD phase).
  61  *
  62  * Version 2.7
  63  *
  64  * Fixed scripts problem which caused certain devices (notably CDRWs)
  65  * to hang on initial INQUIRY.  Updated NCR_700_readl/writel to use
  66  * __raw_readl/writel for parisc compatibility (Thomas
  67  * Bogendoerfer). Added missing SCp->request_bufflen initialisation
  68  * for sense requests (Ryan Bradetich).
  69  *
  70  * Version 2.6
  71  *
  72  * Following test of the 64 bit parisc kernel by Richard Hirst,
  73  * several problems have now been corrected.  Also adds support for
  74  * consistent memory allocation.
  75  *
  76  * Version 2.5
  77  *
  78  * More Compatibility changes for 710 (now actually works).  Enhanced
  79  * support for odd clock speeds which constrain SDTR negotiations.
  80  * correct cacheline separation for scsi messages and status for
  81  * incoherent architectures.  Use of the pci mapping functions on
  82  * buffers to begin support for 64 bit drivers.
  83  *
  84  * Version 2.4
  85  *
  86  * Added support for the 53c710 chip (in 53c700 emulation mode only---no
  87  * special 53c710 instructions or registers are used).
  88  *
  89  * Version 2.3
  90  *
  91  * More endianness/cache coherency changes.
  92  *
  93  * Better bad device handling (handles devices lying about tag
  94  * queueing support and devices which fail to provide sense data on
  95  * contingent allegiance conditions)
  96  *
  97  * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
  98  * debugging this driver on the parisc architecture and suggesting
  99  * many improvements and bug fixes.
 100  *
 101  * Thanks also go to Linuxcare Inc. for providing several PARISC
 102  * machines for me to debug the driver on.
 103  *
 104  * Version 2.2
 105  *
 106  * Made the driver mem or io mapped; added endian invariance; added
 107  * dma cache flushing operations for architectures which need it;
 108  * added support for more varied clocking speeds.
 109  *
 110  * Version 2.1
 111  *
 112  * Initial modularisation from the D700.  See NCR_D700.c for the rest of
 113  * the changelog.
 114  * */
 115 #define NCR_700_VERSION "2.8"
 116
 117 #include <linux/kernel.h>
 118 #include <linux/types.h>
 119 #include <linux/string.h>
 120 #include <linux/ioport.h>
 121 #include <linux/delay.h>
 122 #include <linux/spinlock.h>
 123 #include <linux/completion.h>
 124 #include <linux/sched.h>
 125 #include <linux/init.h>
 126 #include <linux/proc_fs.h>
 127 #include <linux/blkdev.h>
 128 #include <linux/module.h>
 129 #include <linux/interrupt.h>
 130 #include <linux/device.h>
 131 #include <asm/dma.h>
 132 #include <asm/system.h>
 133 #include <asm/io.h>
 134 #include <asm/pgtable.h>
 135 #include <asm/byteorder.h>
 136
 137 #include <scsi/scsi.h>
 138 #include <scsi/scsi_cmnd.h>
 139 #include <scsi/scsi_dbg.h>
 140 #include <scsi/scsi_eh.h>
 141 #include <scsi/scsi_host.h>
 142 #include <scsi/scsi_tcq.h>
 143 #include <scsi/scsi_transport.h>
 144 #include <scsi/scsi_transport_spi.h>
 145
 146 #include "53c700.h"
 147
 148 /* NOTE: For 64 bit drivers there are points in the code where we use
 149  * a non dereferenceable pointer to point to a structure in dma-able
 150  * memory (which is 32 bits) so that we can use all of the structure
 151  * operations but take the address at the end.  This macro allows us
 152  * to truncate the 64 bit pointer down to 32 bits without the compiler
 153  * complaining */
 154 #define to32bit(x)      ((__u32)((unsigned long)(x)))
 155
 156 #ifdef NCR_700_DEBUG
 157 #define STATIC
 158 #else
 159 #define STATIC static
 160 #endif
 161
 162 MODULE_AUTHOR("James Bottomley");
 163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
 164 MODULE_LICENSE("GPL");
 165
 166 /* This is the script */
 167 #include "53c700_d.h"
 168
 169
 170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
 171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
 172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
 173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
 174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
 175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
 176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
 177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
 178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
 179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
 180
 181 STATIC struct device_attribute *NCR_700_dev_attrs[];
 182
 183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 184
 185 struct NCR_700_sense {
 186         unsigned char cmnd[MAX_COMMAND_SIZE];
 187 };
 188
 189 static char *NCR_700_phase[] = {
 190         "",
 191         "after selection",
 192         "before command phase",
 193         "after command phase",
 194         "after status phase",
 195         "after data in phase",
 196         "after data out phase",
 197         "during data phase",
 198 };
 199
 200 static char *NCR_700_condition[] = {
 201         "",
 202         "NOT MSG_OUT",
 203         "UNEXPECTED PHASE",
 204         "NOT MSG_IN",
 205         "UNEXPECTED MSG",
 206         "MSG_IN",
 207         "SDTR_MSG RECEIVED",
 208         "REJECT_MSG RECEIVED",
 209         "DISCONNECT_MSG RECEIVED",
 210         "MSG_OUT",
 211         "DATA_IN",
 212
 213 };
 214
 215 static char *NCR_700_fatal_messages[] = {
 216         "unexpected message after reselection",
 217         "still MSG_OUT after message injection",
 218         "not MSG_IN after selection",
 219         "Illegal message length received",
 220 };
 221
 222 static char *NCR_700_SBCL_bits[] = {
 223         "IO ",
 224         "CD ",
 225         "MSG ",
 226         "ATN ",
 227         "SEL ",
 228         "BSY ",
 229         "ACK ",
 230         "REQ ",
 231 };
 232
 233 static char *NCR_700_SBCL_to_phase[] = {
 234         "DATA_OUT",
 235         "DATA_IN",
 236         "CMD_OUT",
 237         "STATE",
 238         "ILLEGAL PHASE",
 239         "ILLEGAL PHASE",
 240         "MSG OUT",
 241         "MSG IN",
 242 };
 243
 244 /* This translates the SDTR message offset and period to a value
 245  * which can be loaded into the SXFER_REG.
 246  *
 247  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 248  *       actually four times this period value */
 249 static inline __u8
 250 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 251                                __u8 offset, __u8 period)
 252 {
 253         int XFERP;
 254
 255         __u8 min_xferp = (hostdata->chip710
 256                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 257         __u8 max_offset = (hostdata->chip710
 258                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 259
 260         if(offset == 0)
 261                 return 0;
 262
 263         if(period < hostdata->min_period) {
 264                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 265                 period = hostdata->min_period;
 266         }
 267         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 268         if(offset > max_offset) {
 269                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 270                        offset, max_offset);
 271                 offset = max_offset;
 272         }
 273         if(XFERP < min_xferp) {
 274                 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
 275                        XFERP,  min_xferp);
 276                 XFERP =  min_xferp;
 277         }
 278         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 279 }
 280
 281 static inline __u8
 282 NCR_700_get_SXFER(struct scsi_device *SDp)
 283 {
 284         struct NCR_700_Host_Parameters *hostdata =
 285                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 286
 287         return NCR_700_offset_period_to_sxfer(hostdata,
 288                                               spi_offset(SDp->sdev_target),
 289                                               spi_period(SDp->sdev_target));
 290 }
 291
 292 struct Scsi_Host *
 293 NCR_700_detect(struct scsi_host_template *tpnt,
 294                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 295 {
 296         dma_addr_t pScript, pSlots;
 297         __u8 *memory;
 298         __u32 *script;
 299         struct Scsi_Host *host;
 300         static int banner = 0;
 301         int j;
 302
 303         if(tpnt->sdev_attrs == NULL)
 304                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 305
 306         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 307                                        &pScript, GFP_KERNEL);
 308         if(memory == NULL) {
 309                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
 310                 return NULL;
 311         }
 312
 313         script = (__u32 *)memory;
 314         hostdata->msgin = memory + MSGIN_OFFSET;
 315         hostdata->msgout = memory + MSGOUT_OFFSET;
 316         hostdata->status = memory + STATUS_OFFSET;
 317         /* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
 318          * if this isn't sufficient separation to avoid dma flushing issues */
 319         BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
 320         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 321         hostdata->dev = dev;
 322
 323         pSlots = pScript + SLOTS_OFFSET;
 324
 325         /* Fill in the missing routines from the host template */
 326         tpnt->queuecommand = NCR_700_queuecommand;
 327         tpnt->eh_abort_handler = NCR_700_abort;
 328         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
 329         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 330         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 331         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 332         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 333         tpnt->use_clustering = ENABLE_CLUSTERING;
 334         tpnt->slave_configure = NCR_700_slave_configure;
 335         tpnt->slave_destroy = NCR_700_slave_destroy;
 336         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 337         tpnt->change_queue_type = NCR_700_change_queue_type;
 338
 339         if(tpnt->name == NULL)
 340                 tpnt->name = "53c700";
 341         if(tpnt->proc_name == NULL)
 342                 tpnt->proc_name = "53c700";
 343
 344         host = scsi_host_alloc(tpnt, 4);
 345         if (!host)
 346                 return NULL;
 347         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 348                * NCR_700_COMMAND_SLOTS_PER_HOST);
 349         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 350                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 351                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 352                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 353                 if(j == 0)
 354                         hostdata->free_list = &hostdata->slots[j];
 355                 else
 356                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 357                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 358         }
 359
 360         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 361                 script[j] = bS_to_host(SCRIPT[j]);
 362
 363         /* adjust all labels to be bus physical */
 364         for (j = 0; j < PATCHES; j++)
 365                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 366         /* now patch up fixed addresses. */
 367         script_patch_32(script, MessageLocation,
 368                         pScript + MSGOUT_OFFSET);
 369         script_patch_32(script, StatusAddress,
 370                         pScript + STATUS_OFFSET);
 371         script_patch_32(script, ReceiveMsgAddress,
 372                         pScript + MSGIN_OFFSET);
 373
 374         hostdata->script = script;
 375         hostdata->pScript = pScript;
 376         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 377         hostdata->state = NCR_700_HOST_FREE;
 378         hostdata->cmd = NULL;
 379         host->max_id = 8;
 380         host->max_lun = NCR_700_MAX_LUNS;
 381         BUG_ON(NCR_700_transport_template == NULL);
 382         host->transportt = NCR_700_transport_template;
 383         host->unique_id = (unsigned long)hostdata->base;
 384         hostdata->eh_complete = NULL;
 385         host->hostdata[0] = (unsigned long)hostdata;
 386         /* kick the chip */
 387         NCR_700_writeb(0xff, host, CTEST9_REG);
 388         if (hostdata->chip710)
 389                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 390         else
 391                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 392         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 393         if (banner == 0) {
 394                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 395                 banner = 1;
 396         }
 397         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 398                hostdata->chip710 ? "53c710" :
 399                (hostdata->fast ? "53c700-66" : "53c700"),
 400                hostdata->rev, hostdata->differential ?
 401                "(Differential)" : "");
 402         /* reset the chip */
 403         NCR_700_chip_reset(host);
 404
 405         if (scsi_add_host(host, dev)) {
 406                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 407                 scsi_host_put(host);
 408                 return NULL;
 409         }
 410
 411         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 412                 SPI_SIGNAL_SE;
 413
 414         return host;
 415 }
 416
 417 int
 418 NCR_700_release(struct Scsi_Host *host)
 419 {
 420         struct NCR_700_Host_Parameters *hostdata =
 421                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 422
 423         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 424                                hostdata->script, hostdata->pScript);
 425         return 1;
 426 }
 427
 428 static inline __u8
 429 NCR_700_identify(int can_disconnect, __u8 lun)
 430 {
 431         return IDENTIFY_BASE |
 432                 ((can_disconnect) ? 0x40 : 0) |
 433                 (lun & NCR_700_LUN_MASK);
 434 }
 435
 436 /*
 437  * Function : static int data_residual (Scsi_Host *host)
 438  *
 439  * Purpose : return residual data count of what's in the chip.  If you
 440  * really want to know what this function is doing, it's almost a
 441  * direct transcription of the algorithm described in the 53c710
 442  * guide, except that the DBC and DFIFO registers are only 6 bits
 443  * wide on a 53c700.
 444  *
 445  * Inputs : host - SCSI host */
 446 static inline int
 447 NCR_700_data_residual (struct Scsi_Host *host) {
 448         struct NCR_700_Host_Parameters *hostdata =
 449                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 450         int count, synchronous = 0;
 451         unsigned int ddir;
 452
 453         if(hostdata->chip710) {
 454                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 455                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 456         } else {
 457                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 458                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 459         }
 460
 461         if(hostdata->fast)
 462                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 463
 464         /* get the data direction */
 465         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 466
 467         if (ddir) {
 468                 /* Receive */
 469                 if (synchronous)
 470                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 471                 else
 472                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 473                                 ++count;
 474         } else {
 475                 /* Send */
 476                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 477                 if (sstat & SODL_REG_FULL)
 478                         ++count;
 479                 if (synchronous && (sstat & SODR_REG_FULL))
 480                         ++count;
 481         }
 482 #ifdef NCR_700_DEBUG
 483         if(count)
 484                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 485 #endif
 486         return count;
 487 }
 488
 489 /* print out the SCSI wires and corresponding phase from the SBCL register
 490  * in the chip */
 491 static inline char *
 492 sbcl_to_string(__u8 sbcl)
 493 {
 494         int i;
 495         static char ret[256];
 496
 497         ret[0]='\0';
 498         for(i=0; i<8; i++) {
 499                 if((1<<i) & sbcl)
 500                         strcat(ret, NCR_700_SBCL_bits[i]);
 501         }
 502         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 503         return ret;
 504 }
 505
 506 static inline __u8
 507 bitmap_to_number(__u8 bitmap)
 508 {
 509         __u8 i;
 510
 511         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 512                 ;
 513         return i;
 514 }
 515
 516 /* Pull a slot off the free list */
 517 STATIC struct NCR_700_command_slot *
 518 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 519 {
 520         struct NCR_700_command_slot *slot = hostdata->free_list;
 521
 522         if(slot == NULL) {
 523                 /* sanity check */
 524                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 525                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 526                 return NULL;
 527         }
 528
 529         if(slot->state != NCR_700_SLOT_FREE)
 530                 /* should panic! */
 531                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 532
 533
 534         hostdata->free_list = slot->ITL_forw;
 535         slot->ITL_forw = NULL;
 536
 537
 538         /* NOTE: set the state to busy here, not queued, since this
 539          * indicates the slot is in use and cannot be run by the IRQ
 540          * finish routine.  If we cannot queue the command when it
 541          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 542         slot->state = NCR_700_SLOT_BUSY;
 543         slot->flags = 0;
 544         hostdata->command_slot_count++;
 545
 546         return slot;
 547 }
 548
 549 STATIC void
 550 free_slot(struct NCR_700_command_slot *slot,
 551           struct NCR_700_Host_Parameters *hostdata)
 552 {
 553         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 554                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 555         }
 556         if(slot->state == NCR_700_SLOT_FREE) {
 557                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 558         }
 559
 560         slot->resume_offset = 0;
 561         slot->cmnd = NULL;
 562         slot->state = NCR_700_SLOT_FREE;
 563         slot->ITL_forw = hostdata->free_list;
 564         hostdata->free_list = slot;
 565         hostdata->command_slot_count--;
 566 }
 567
 568
 569 /* This routine really does very little.  The command is indexed on
 570    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 571 STATIC void
 572 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 573                      struct scsi_cmnd *SCp, __u32 dsp)
 574 {
 575         /* Its just possible that this gets executed twice */
 576         if(SCp != NULL) {
 577                 struct NCR_700_command_slot *slot =
 578                         (struct NCR_700_command_slot *)SCp->host_scribble;
 579
 580                 slot->resume_offset = dsp;
 581         }
 582         hostdata->state = NCR_700_HOST_FREE;
 583         hostdata->cmd = NULL;
 584 }
 585
 586 STATIC inline void
 587 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 588               struct NCR_700_command_slot *slot)
 589 {
 590         if(SCp->sc_data_direction != DMA_NONE &&
 591            SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
 592                 if(SCp->use_sg) {
 593                         dma_unmap_sg(hostdata->dev, SCp->request_buffer,
 594                                      SCp->use_sg, SCp->sc_data_direction);
 595                 } else {
 596                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 597                                          SCp->request_bufflen,
 598                                          SCp->sc_data_direction);
 599                 }
 600         }
 601 }
 602
 603 STATIC inline void
 604 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 605                struct scsi_cmnd *SCp, int result)
 606 {
 607         hostdata->state = NCR_700_HOST_FREE;
 608         hostdata->cmd = NULL;
 609
 610         if(SCp != NULL) {
 611                 struct NCR_700_command_slot *slot =
 612                         (struct NCR_700_command_slot *)SCp->host_scribble;
 613
 614                 NCR_700_unmap(hostdata, SCp, slot);
 615                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 616                         struct NCR_700_sense *sense = SCp->device->hostdata;
 617 #ifdef NCR_700_DEBUG
 618                         printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
 619                                SCp, SCp->cmnd[7], result);
 620                         scsi_print_sense("53c700", SCp);
 621
 622 #endif
 623                         dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
 624                         /* restore the old result if the request sense was
 625                          * successful */
 626                         if(result == 0)
 627                                 result = sense->cmnd[7];
 628                 } else
 629                         dma_unmap_single(hostdata->dev, slot->pCmd,
 630                                          sizeof(SCp->cmnd), DMA_TO_DEVICE);
 631
 632                 free_slot(slot, hostdata);
 633 #ifdef NCR_700_DEBUG
 634                 if(NCR_700_get_depth(SCp->device) == 0 ||
 635                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 636                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 637                                NCR_700_get_depth(SCp->device));
 638 #endif /* NCR_700_DEBUG */
 639                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 640
 641                 SCp->host_scribble = NULL;
 642                 SCp->result = result;
 643                 SCp->scsi_done(SCp);
 644         } else {
 645                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 646         }
 647 }
 648
 649
 650 STATIC void
 651 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 652 {
 653         /* Bus reset */
 654         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 655         udelay(50);
 656         NCR_700_writeb(0, host, SCNTL1_REG);
 657
 658 }
 659
 660 STATIC void
 661 NCR_700_chip_setup(struct Scsi_Host *host)
 662 {
 663         struct NCR_700_Host_Parameters *hostdata =
 664                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 665         __u32 dcntl_extra = 0;
 666         __u8 min_period;
 667         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 668
 669         if(hostdata->chip710) {
 670                 __u8 burst_disable = hostdata->burst_disable
 671                         ? BURST_DISABLE : 0;
 672                 dcntl_extra = COMPAT_700_MODE;
 673
 674                 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
 675                 NCR_700_writeb(BURST_LENGTH_8  | hostdata->dmode_extra,
 676                                host, DMODE_710_REG);
 677                 NCR_700_writeb(burst_disable | (hostdata->differential ?
 678                                                 DIFF : 0), host, CTEST7_REG);
 679                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 680                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 681                                | AUTO_ATN, host, SCNTL0_REG);
 682         } else {
 683                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 684                                host, DMODE_700_REG);
 685                 NCR_700_writeb(hostdata->differential ?
 686                                DIFF : 0, host, CTEST7_REG);
 687                 if(hostdata->fast) {
 688                         /* this is for 700-66, does nothing on 700 */
 689                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 690                                        | GENERATE_RECEIVE_PARITY, host,
 691                                        CTEST8_REG);
 692                 } else {
 693                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 694                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 695                 }
 696         }
 697
 698         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 699         NCR_700_writeb(0, host, SBCL_REG);
 700         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 701
 702         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 703              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 704
 705         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 706         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 707         if(hostdata->clock > 75) {
 708                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 709                 /* do the best we can, but the async clock will be out
 710                  * of spec: sync divider 2, async divider 3 */
 711                 DEBUG(("53c700: sync 2 async 3\n"));
 712                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 713                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
 714                 hostdata->sync_clock = hostdata->clock/2;
 715         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 716                 /* sync divider 1.5, async divider 3 */
 717                 DEBUG(("53c700: sync 1.5 async 3\n"));
 718                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 719                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
 720                 hostdata->sync_clock = hostdata->clock*2;
 721                 hostdata->sync_clock /= 3;
 722
 723         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 724                 /* sync divider 1, async divider 2 */
 725                 DEBUG(("53c700: sync 1 async 2\n"));
 726                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 727                 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
 728                 hostdata->sync_clock = hostdata->clock;
 729         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 730                 /* sync divider 1, async divider 1.5 */
 731                 DEBUG(("53c700: sync 1 async 1.5\n"));
 732                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 733                 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
 734                 hostdata->sync_clock = hostdata->clock;
 735         } else {
 736                 DEBUG(("53c700: sync 1 async 1\n"));
 737                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 738                 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
 739                 /* sync divider 1, async divider 1 */
 740                 hostdata->sync_clock = hostdata->clock;
 741         }
 742         /* Calculate the actual minimum period that can be supported
 743          * by our synchronous clock speed.  See the 710 manual for
 744          * exact details of this calculation which is based on a
 745          * setting of the SXFER register */
 746         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 747         hostdata->min_period = NCR_700_MIN_PERIOD;
 748         if(min_period > NCR_700_MIN_PERIOD)
 749                 hostdata->min_period = min_period;
 750 }
 751
 752 STATIC void
 753 NCR_700_chip_reset(struct Scsi_Host *host)
 754 {
 755         struct NCR_700_Host_Parameters *hostdata =
 756                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 757         if(hostdata->chip710) {
 758                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 759                 udelay(100);
 760
 761                 NCR_700_writeb(0, host, ISTAT_REG);
 762         } else {
 763                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 764                 udelay(100);
 765
 766                 NCR_700_writeb(0, host, DCNTL_REG);
 767         }
 768
 769         mdelay(1000);
 770
 771         NCR_700_chip_setup(host);
 772 }
 773
 774 /* The heart of the message processing engine is that the instruction
 775  * immediately after the INT is the normal case (and so must be CLEAR
 776  * ACK).  If we want to do something else, we call that routine in
 777  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 778  * ACK) so that the routine returns correctly to resume its activity
 779  * */
 780 STATIC __u32
 781 process_extended_message(struct Scsi_Host *host,
 782                          struct NCR_700_Host_Parameters *hostdata,
 783                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 784 {
 785         __u32 resume_offset = dsp, temp = dsp + 8;
 786         __u8 pun = 0xff, lun = 0xff;
 787
 788         if(SCp != NULL) {
 789                 pun = SCp->device->id;
 790                 lun = SCp->device->lun;
 791         }
 792
 793         switch(hostdata->msgin[2]) {
 794         case A_SDTR_MSG:
 795                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 796                         struct scsi_target *starget = SCp->device->sdev_target;
 797                         __u8 period = hostdata->msgin[3];
 798                         __u8 offset = hostdata->msgin[4];
 799
 800                         if(offset == 0 || period == 0) {
 801                                 offset = 0;
 802                                 period = 0;
 803                         }
 804
 805                         spi_offset(starget) = offset;
 806                         spi_period(starget) = period;
 807
 808                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 809                                 spi_display_xfer_agreement(starget);
 810                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 811                         }
 812
 813                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 814                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 815
 816                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 817                                        host, SXFER_REG);
 818
 819                 } else {
 820                         /* SDTR message out of the blue, reject it */
 821                         shost_printk(KERN_WARNING, host,
 822                                 "Unexpected SDTR msg\n");
 823                         hostdata->msgout[0] = A_REJECT_MSG;
 824                         dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
 825                         script_patch_16(hostdata->script, MessageCount, 1);
 826                         /* SendMsgOut returns, so set up the return
 827                          * address */
 828                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 829                 }
 830                 break;
 831
 832         case A_WDTR_MSG:
 833                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 834                        host->host_no, pun, lun);
 835                 hostdata->msgout[0] = A_REJECT_MSG;
 836                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
 837                 script_patch_16(hostdata->script, MessageCount, 1);
 838                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 839
 840                 break;
 841
 842         default:
 843                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 844                        host->host_no, pun, lun,
 845                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 846                 spi_print_msg(hostdata->msgin);
 847                 printk("\n");
 848                 /* just reject it */
 849                 hostdata->msgout[0] = A_REJECT_MSG;
 850                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
 851                 script_patch_16(hostdata->script, MessageCount, 1);
 852                 /* SendMsgOut returns, so set up the return
 853                  * address */
 854                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 855         }
 856         NCR_700_writel(temp, host, TEMP_REG);
 857         return resume_offset;
 858 }
 859
 860 STATIC __u32
 861 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 862                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 863 {
 864         /* work out where to return to */
 865         __u32 temp = dsp + 8, resume_offset = dsp;
 866         __u8 pun = 0xff, lun = 0xff;
 867
 868         if(SCp != NULL) {
 869                 pun = SCp->device->id;
 870                 lun = SCp->device->lun;
 871         }
 872
 873 #ifdef NCR_700_DEBUG
 874         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 875                NCR_700_phase[(dsps & 0xf00) >> 8]);
 876         spi_print_msg(hostdata->msgin);
 877         printk("\n");
 878 #endif
 879
 880         switch(hostdata->msgin[0]) {
 881
 882         case A_EXTENDED_MSG:
 883                 resume_offset =  process_extended_message(host, hostdata, SCp,
 884                                                           dsp, dsps);
 885                 break;
 886
 887         case A_REJECT_MSG:
 888                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 889                         /* Rejected our sync negotiation attempt */
 890                         spi_period(SCp->device->sdev_target) =
 891                                 spi_offset(SCp->device->sdev_target) = 0;
 892                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 893                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 894                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 895                         /* rejected our first simple tag message */
 896                         scmd_printk(KERN_WARNING, SCp,
 897                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 898                         /* we're done negotiating */
 899                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 900                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 901                         SCp->device->tagged_supported = 0;
 902                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
 903                 } else {
 904                         shost_printk(KERN_WARNING, host,
 905                                 "(%d:%d) Unexpected REJECT Message %s\n",
 906                                pun, lun,
 907                                NCR_700_phase[(dsps & 0xf00) >> 8]);
 908                         /* however, just ignore it */
 909                 }
 910                 break;
 911
 912         case A_PARITY_ERROR_MSG:
 913                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
 914                        pun, lun);
 915                 NCR_700_internal_bus_reset(host);
 916                 break;
 917         case A_SIMPLE_TAG_MSG:
 918                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
 919                        pun, lun, hostdata->msgin[1],
 920                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 921                 /* just ignore it */
 922                 break;
 923         default:
 924                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 925                        host->host_no, pun, lun,
 926                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 927
 928                 spi_print_msg(hostdata->msgin);
 929                 printk("\n");
 930                 /* just reject it */
 931                 hostdata->msgout[0] = A_REJECT_MSG;
 932                 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
 933                 script_patch_16(hostdata->script, MessageCount, 1);
 934                 /* SendMsgOut returns, so set up the return
 935                  * address */
 936                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 937
 938                 break;
 939         }
 940         NCR_700_writel(temp, host, TEMP_REG);
 941         /* set us up to receive another message */
 942         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 943         return resume_offset;
 944 }
 945
 946 STATIC __u32
 947 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 948                          struct Scsi_Host *host,
 949                          struct NCR_700_Host_Parameters *hostdata)
 950 {
 951         __u32 resume_offset = 0;
 952         __u8 pun = 0xff, lun=0xff;
 953
 954         if(SCp != NULL) {
 955                 pun = SCp->device->id;
 956                 lun = SCp->device->lun;
 957         }
 958
 959         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 960                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 961                        hostdata->status[0]));
 962                 /* OK, if TCQ still under negotiation, we now know it works */
 963                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 964                         NCR_700_set_tag_neg_state(SCp->device,
 965                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 966
 967                 /* check for contingent allegiance contitions */
 968                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 969                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 970                         struct NCR_700_command_slot *slot =
 971                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 972                         if(SCp->cmnd[0] == REQUEST_SENSE) {
 973                                 /* OOPS: bad device, returning another
 974                                  * contingent allegiance condition */
 975                                 scmd_printk(KERN_ERR, SCp,
 976                                         "broken device is looping in contingent allegiance: ignoring\n");
 977                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 978                         } else {
 979                                 struct NCR_700_sense *sense = SCp->device->hostdata;
 980 #ifdef NCR_DEBUG
 981                                 scsi_print_command(SCp);
 982                                 printk("  cmd %p has status %d, requesting sense\n",
 983                                        SCp, hostdata->status[0]);
 984 #endif
 985                                 /* we can destroy the command here
 986                                  * because the contingent allegiance
 987                                  * condition will cause a retry which
 988                                  * will re-copy the command from the
 989                                  * saved data_cmnd.  We also unmap any
 990                                  * data associated with the command
 991                                  * here */
 992                                 NCR_700_unmap(hostdata, SCp, slot);
 993                                 dma_unmap_single(hostdata->dev, slot->pCmd,
 994                                                  sizeof(SCp->cmnd),
 995                                                  DMA_TO_DEVICE);
 996
 997                                 sense->cmnd[0] = REQUEST_SENSE;
 998                                 sense->cmnd[1] = (SCp->device->lun & 0x7) << 5;
 999                                 sense->cmnd[2] = 0;
1000                                 sense->cmnd[3] = 0;
1001                                 sense->cmnd[4] = sizeof(SCp->sense_buffer);
1002                                 sense->cmnd[5] = 0;
1003                                 /* Here's a quiet hack: the
1004                                  * REQUEST_SENSE command is six bytes,
1005                                  * so store a flag indicating that
1006                                  * this was an internal sense request
1007                                  * and the original status at the end
1008                                  * of the command */
1009                                 sense->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1010                                 sense->cmnd[7] = hostdata->status[0];
1011                                 slot->pCmd = dma_map_single(hostdata->dev, sense->cmnd, sizeof(sense->cmnd), DMA_TO_DEVICE);
1012                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1013                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1014                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1015                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1016                                 slot->SG[1].pAddr = 0;
1017                                 slot->resume_offset = hostdata->pScript;
1018                                 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1019                                 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1020
1021                                 /* queue the command for reissue */
1022                                 slot->state = NCR_700_SLOT_QUEUED;
1023                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1024                                 hostdata->state = NCR_700_HOST_FREE;
1025                                 hostdata->cmd = NULL;
1026                         }
1027                 } else {
1028                         // Currently rely on the mid layer evaluation
1029                         // of the tag queuing capability
1030                         //
1031                         //if(status_byte(hostdata->status[0]) == GOOD &&
1032                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1033                         //      /* Piggy back the tag queueing support
1034                         //       * on this command */
1035                         //      dma_sync_single_for_cpu(hostdata->dev,
1036                         //                          slot->dma_handle,
1037                         //                          SCp->request_bufflen,
1038                         //                          DMA_FROM_DEVICE);
1039                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1040                         //              scmd_printk(KERN_INFO, SCp,
1041                         //                   "Enabling Tag Command Queuing\n");
1042                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1043                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1044                         //      } else {
1045                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1046                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1047                         //      }
1048                         //}
1049                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1050                 }
1051         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1052                 __u8 i = (dsps & 0xf00) >> 8;
1053
1054                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1055                        NCR_700_phase[i],
1056                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1057                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1058                         SCp->cmd_len);
1059                 scsi_print_command(SCp);
1060
1061                 NCR_700_internal_bus_reset(host);
1062         } else if((dsps & 0xfffff000) == A_FATAL) {
1063                 int i = (dsps & 0xfff);
1064
1065                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1066                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1067                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1068                         printk(KERN_ERR "     msg begins %02x %02x\n",
1069                                hostdata->msgin[0], hostdata->msgin[1]);
1070                 }
1071                 NCR_700_internal_bus_reset(host);
1072         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1073 #ifdef NCR_700_DEBUG
1074                 __u8 i = (dsps & 0xf00) >> 8;
1075
1076                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1077                        host->host_no, pun, lun,
1078                        i, NCR_700_phase[i]);
1079 #endif
1080                 save_for_reselection(hostdata, SCp, dsp);
1081
1082         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1083                 __u8 lun;
1084                 struct NCR_700_command_slot *slot;
1085                 __u8 reselection_id = hostdata->reselection_id;
1086                 struct scsi_device *SDp;
1087
1088                 lun = hostdata->msgin[0] & 0x1f;
1089
1090                 hostdata->reselection_id = 0xff;
1091                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1092                        host->host_no, reselection_id, lun));
1093                 /* clear the reselection indicator */
1094                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1095                 if(unlikely(SDp == NULL)) {
1096                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1097                                host->host_no, reselection_id, lun);
1098                         BUG();
1099                 }
1100                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1101                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1102                         if(unlikely(SCp == NULL)) {
1103                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1104                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1105                                 BUG();
1106                         }
1107
1108                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1109                         DDEBUG(KERN_DEBUG, SDp,
1110                                 "reselection is tag %d, slot %p(%d)\n",
1111                                 hostdata->msgin[2], slot, slot->tag);
1112                 } else {
1113                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1114                         if(unlikely(SCp == NULL)) {
1115                                 sdev_printk(KERN_ERR, SDp,
1116                                         "no saved request for untagged cmd\n");
1117                                 BUG();
1118                         }
1119                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1120                 }
1121
1122                 if(slot == NULL) {
1123                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1124                                host->host_no, reselection_id, lun,
1125                                hostdata->msgin[0], hostdata->msgin[1],
1126                                hostdata->msgin[2]);
1127                 } else {
1128                         if(hostdata->state != NCR_700_HOST_BUSY)
1129                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1130                                        host->host_no);
1131                         resume_offset = slot->resume_offset;
1132                         hostdata->cmd = slot->cmnd;
1133
1134                         /* re-patch for this command */
1135                         script_patch_32_abs(hostdata->script, CommandAddress,
1136                                             slot->pCmd);
1137                         script_patch_16(hostdata->script,
1138                                         CommandCount, slot->cmnd->cmd_len);
1139                         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1140                                             to32bit(&slot->pSG[0].ins));
1141
1142                         /* Note: setting SXFER only works if we're
1143                          * still in the MESSAGE phase, so it is vital
1144                          * that ACK is still asserted when we process
1145                          * the reselection message.  The resume offset
1146                          * should therefore always clear ACK */
1147                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1148                                        host, SXFER_REG);
1149                         dma_cache_sync(hostdata->msgin,
1150                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1151                         dma_cache_sync(hostdata->msgout,
1152                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1153                         /* I'm just being paranoid here, the command should
1154                          * already have been flushed from the cache */
1155                         dma_cache_sync(slot->cmnd->cmnd,
1156                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1157
1158
1159
1160                 }
1161         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1162
1163                 /* This section is full of debugging code because I've
1164                  * never managed to reach it.  I think what happens is
1165                  * that, because the 700 runs with selection
1166                  * interrupts enabled the whole time that we take a
1167                  * selection interrupt before we manage to get to the
1168                  * reselected script interrupt */
1169
1170                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1171                 struct NCR_700_command_slot *slot;
1172
1173                 /* Take out our own ID */
1174                 reselection_id &= ~(1<<host->this_id);
1175
1176                 /* I've never seen this happen, so keep this as a printk rather
1177                  * than a debug */
1178                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1179                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1180
1181                 {
1182                         /* FIXME: DEBUGGING CODE */
1183                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1184                         int i;
1185
1186                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1187                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1188                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1189                                         break;
1190                         }
1191                         printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1192                         SCp =  hostdata->slots[i].cmnd;
1193                 }
1194
1195                 if(SCp != NULL) {
1196                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1197                         /* change slot from busy to queued to redo command */
1198                         slot->state = NCR_700_SLOT_QUEUED;
1199                 }
1200                 hostdata->cmd = NULL;
1201
1202                 if(reselection_id == 0) {
1203                         if(hostdata->reselection_id == 0xff) {
1204                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1205                                 return 0;
1206                         } else {
1207                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1208                                        host->host_no);
1209                                 reselection_id = hostdata->reselection_id;
1210                         }
1211                 } else {
1212
1213                         /* convert to real ID */
1214                         reselection_id = bitmap_to_number(reselection_id);
1215                 }
1216                 hostdata->reselection_id = reselection_id;
1217                 /* just in case we have a stale simple tag message, clear it */
1218                 hostdata->msgin[1] = 0;
1219                 dma_cache_sync(hostdata->msgin,
1220                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1221                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1222                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1223                 } else {
1224                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1225                 }
1226         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1227                 /* we've just disconnected from the bus, do nothing since
1228                  * a return here will re-run the queued command slot
1229                  * that may have been interrupted by the initial selection */
1230                 DEBUG((" SELECTION COMPLETED\n"));
1231         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1232                 resume_offset = process_message(host, hostdata, SCp,
1233                                                 dsp, dsps);
1234         } else if((dsps &  0xfffff000) == 0) {
1235                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1236                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1237                        host->host_no, pun, lun, NCR_700_condition[i],
1238                        NCR_700_phase[j], dsp - hostdata->pScript);
1239                 if(SCp != NULL) {
1240                         scsi_print_command(SCp);
1241
1242                         if(SCp->use_sg) {
1243                                 for(i = 0; i < SCp->use_sg + 1; i++) {
1244                                         printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1245                                 }
1246                         }
1247                 }
1248                 NCR_700_internal_bus_reset(host);
1249         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1250                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1251                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1252                 resume_offset = dsp;
1253         } else {
1254                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1255                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1256                 NCR_700_internal_bus_reset(host);
1257         }
1258         return resume_offset;
1259 }
1260
1261 /* We run the 53c700 with selection interrupts always enabled.  This
1262  * means that the chip may be selected as soon as the bus frees.  On a
1263  * busy bus, this can be before the scripts engine finishes its
1264  * processing.  Therefore, part of the selection processing has to be
1265  * to find out what the scripts engine is doing and complete the
1266  * function if necessary (i.e. process the pending disconnect or save
1267  * the interrupted initial selection */
1268 STATIC inline __u32
1269 process_selection(struct Scsi_Host *host, __u32 dsp)
1270 {
1271         __u8 id = 0;    /* Squash compiler warning */
1272         int count = 0;
1273         __u32 resume_offset = 0;
1274         struct NCR_700_Host_Parameters *hostdata =
1275                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1276         struct scsi_cmnd *SCp = hostdata->cmd;
1277         __u8 sbcl;
1278
1279         for(count = 0; count < 5; count++) {
1280                 id = NCR_700_readb(host, hostdata->chip710 ?
1281                                    CTEST9_REG : SFBR_REG);
1282
1283                 /* Take out our own ID */
1284                 id &= ~(1<<host->this_id);
1285                 if(id != 0)
1286                         break;
1287                 udelay(5);
1288         }
1289         sbcl = NCR_700_readb(host, SBCL_REG);
1290         if((sbcl & SBCL_IO) == 0) {
1291                 /* mark as having been selected rather than reselected */
1292                 id = 0xff;
1293         } else {
1294                 /* convert to real ID */
1295                 hostdata->reselection_id = id = bitmap_to_number(id);
1296                 DEBUG(("scsi%d:  Reselected by %d\n",
1297                        host->host_no, id));
1298         }
1299         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1300                 struct NCR_700_command_slot *slot =
1301                         (struct NCR_700_command_slot *)SCp->host_scribble;
1302                 DEBUG(("  ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1303
1304                 switch(dsp - hostdata->pScript) {
1305                 case Ent_Disconnect1:
1306                 case Ent_Disconnect2:
1307                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1308                         break;
1309                 case Ent_Disconnect3:
1310                 case Ent_Disconnect4:
1311                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1312                         break;
1313                 case Ent_Disconnect5:
1314                 case Ent_Disconnect6:
1315                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1316                         break;
1317                 case Ent_Disconnect7:
1318                 case Ent_Disconnect8:
1319                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1320                         break;
1321                 case Ent_Finish1:
1322                 case Ent_Finish2:
1323                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1324                         break;
1325
1326                 default:
1327                         slot->state = NCR_700_SLOT_QUEUED;
1328                         break;
1329                         }
1330         }
1331         hostdata->state = NCR_700_HOST_BUSY;
1332         hostdata->cmd = NULL;
1333         /* clear any stale simple tag message */
1334         hostdata->msgin[1] = 0;
1335         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1336                        DMA_BIDIRECTIONAL);
1337
1338         if(id == 0xff) {
1339                 /* Selected as target, Ignore */
1340                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1341         } else if(hostdata->tag_negotiated & (1<<id)) {
1342                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1343         } else {
1344                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1345         }
1346         return resume_offset;
1347 }
1348
1349 static inline void
1350 NCR_700_clear_fifo(struct Scsi_Host *host) {
1351         const struct NCR_700_Host_Parameters *hostdata
1352                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1353         if(hostdata->chip710) {
1354                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1355         } else {
1356                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1357         }
1358 }
1359
1360 static inline void
1361 NCR_700_flush_fifo(struct Scsi_Host *host) {
1362         const struct NCR_700_Host_Parameters *hostdata
1363                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1364         if(hostdata->chip710) {
1365                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1366                 udelay(10);
1367                 NCR_700_writeb(0, host, CTEST8_REG);
1368         } else {
1369                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1370                 udelay(10);
1371                 NCR_700_writeb(0, host, DFIFO_REG);
1372         }
1373 }
1374
1375
1376 /* The queue lock with interrupts disabled must be held on entry to
1377  * this function */
1378 STATIC int
1379 NCR_700_start_command(struct scsi_cmnd *SCp)
1380 {
1381         struct NCR_700_command_slot *slot =
1382                 (struct NCR_700_command_slot *)SCp->host_scribble;
1383         struct NCR_700_Host_Parameters *hostdata =
1384                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1385         __u16 count = 1;        /* for IDENTIFY message */
1386
1387         if(hostdata->state != NCR_700_HOST_FREE) {
1388                 /* keep this inside the lock to close the race window where
1389                  * the running command finishes on another CPU while we don't
1390                  * change the state to queued on this one */
1391                 slot->state = NCR_700_SLOT_QUEUED;
1392
1393                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1394                        SCp->device->host->host_no, slot->cmnd, slot));
1395                 return 0;
1396         }
1397         hostdata->state = NCR_700_HOST_BUSY;
1398         hostdata->cmd = SCp;
1399         slot->state = NCR_700_SLOT_BUSY;
1400         /* keep interrupts disabled until we have the command correctly
1401          * set up so we cannot take a selection interrupt */
1402
1403         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1404                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1405                                                SCp->device->lun);
1406         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1407          * if the negotiated transfer parameters still hold, so
1408          * always renegotiate them */
1409         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1410            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1411                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1412         }
1413
1414         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1415          * If a contingent allegiance condition exists, the device
1416          * will refuse all tags, so send the request sense as untagged
1417          * */
1418         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1419            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1420                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1421                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1422         }
1423
1424         if(hostdata->fast &&
1425            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1426                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1427                                 spi_period(SCp->device->sdev_target),
1428                                 spi_offset(SCp->device->sdev_target));
1429                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1430         }
1431
1432         script_patch_16(hostdata->script, MessageCount, count);
1433
1434
1435         script_patch_ID(hostdata->script,
1436                         Device_ID, 1<<scmd_id(SCp));
1437
1438         script_patch_32_abs(hostdata->script, CommandAddress,
1439                             slot->pCmd);
1440         script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1441         /* finally plumb the beginning of the SG list into the script
1442          * */
1443         script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1444                             to32bit(&slot->pSG[0].ins));
1445         NCR_700_clear_fifo(SCp->device->host);
1446
1447         if(slot->resume_offset == 0)
1448                 slot->resume_offset = hostdata->pScript;
1449         /* now perform all the writebacks and invalidates */
1450         dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1451         dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1452                        DMA_FROM_DEVICE);
1453         dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1454         dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1455
1456         /* set the synchronous period/offset */
1457         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1458                        SCp->device->host, SXFER_REG);
1459         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1460         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1461
1462         return 1;
1463 }
1464
1465 irqreturn_t
1466 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1467 {
1468         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1469         struct NCR_700_Host_Parameters *hostdata =
1470                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1471         __u8 istat;
1472         __u32 resume_offset = 0;
1473         __u8 pun = 0xff, lun = 0xff;
1474         unsigned long flags;
1475         int handled = 0;
1476
1477         /* Use the host lock to serialise acess to the 53c700
1478          * hardware.  Note: In future, we may need to take the queue
1479          * lock to enter the done routines.  When that happens, we
1480          * need to ensure that for this driver, the host lock and the
1481          * queue lock point to the same thing. */
1482         spin_lock_irqsave(host->host_lock, flags);
1483         if((istat = NCR_700_readb(host, ISTAT_REG))
1484               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1485                 __u32 dsps;
1486                 __u8 sstat0 = 0, dstat = 0;
1487                 __u32 dsp;
1488                 struct scsi_cmnd *SCp = hostdata->cmd;
1489                 enum NCR_700_Host_State state;
1490
1491                 handled = 1;
1492                 state = hostdata->state;
1493                 SCp = hostdata->cmd;
1494
1495                 if(istat & SCSI_INT_PENDING) {
1496                         udelay(10);
1497
1498                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1499                 }
1500
1501                 if(istat & DMA_INT_PENDING) {
1502                         udelay(10);
1503
1504                         dstat = NCR_700_readb(host, DSTAT_REG);
1505                 }
1506
1507                 dsps = NCR_700_readl(host, DSPS_REG);
1508                 dsp = NCR_700_readl(host, DSP_REG);
1509
1510                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1511                        host->host_no, istat, sstat0, dstat,
1512                        (dsp - (__u32)(hostdata->pScript))/4,
1513                        dsp, dsps));
1514
1515                 if(SCp != NULL) {
1516                         pun = SCp->device->id;
1517                         lun = SCp->device->lun;
1518                 }
1519
1520                 if(sstat0 & SCSI_RESET_DETECTED) {
1521                         struct scsi_device *SDp;
1522                         int i;
1523
1524                         hostdata->state = NCR_700_HOST_BUSY;
1525
1526                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1527                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1528
1529                         scsi_report_bus_reset(host, 0);
1530
1531                         /* clear all the negotiated parameters */
1532                         __shost_for_each_device(SDp, host)
1533                                 SDp->hostdata = NULL;
1534
1535                         /* clear all the slots and their pending commands */
1536                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1537                                 struct scsi_cmnd *SCp;
1538                                 struct NCR_700_command_slot *slot =
1539                                         &hostdata->slots[i];
1540
1541                                 if(slot->state == NCR_700_SLOT_FREE)
1542                                         continue;
1543
1544                                 SCp = slot->cmnd;
1545                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1546                                        slot, SCp);
1547                                 free_slot(slot, hostdata);
1548                                 SCp->host_scribble = NULL;
1549                                 NCR_700_set_depth(SCp->device, 0);
1550                                 /* NOTE: deadlock potential here: we
1551                                  * rely on mid-layer guarantees that
1552                                  * scsi_done won't try to issue the
1553                                  * command again otherwise we'll
1554                                  * deadlock on the
1555                                  * hostdata->state_lock */
1556                                 SCp->result = DID_RESET << 16;
1557                                 SCp->scsi_done(SCp);
1558                         }
1559                         mdelay(25);
1560                         NCR_700_chip_setup(host);
1561
1562                         hostdata->state = NCR_700_HOST_FREE;
1563                         hostdata->cmd = NULL;
1564                         /* signal back if this was an eh induced reset */
1565                         if(hostdata->eh_complete != NULL)
1566                                 complete(hostdata->eh_complete);
1567                         goto out_unlock;
1568                 } else if(sstat0 & SELECTION_TIMEOUT) {
1569                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1570                                host->host_no, pun, lun));
1571                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1572                 } else if(sstat0 & PHASE_MISMATCH) {
1573                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1574                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1575
1576                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1577                                 /* It wants to reply to some part of
1578                                  * our message */
1579 #ifdef NCR_700_DEBUG
1580                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1581                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1582                                 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1583 #endif
1584                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1585                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1586                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1587                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1588                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1589                                 int residual = NCR_700_data_residual(host);
1590                                 int i;
1591 #ifdef NCR_700_DEBUG
1592                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1593
1594                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1595                                        host->host_no, pun, lun,
1596                                        SGcount, data_transfer);
1597                                 scsi_print_command(SCp);
1598                                 if(residual) {
1599                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1600                                        host->host_no, pun, lun,
1601                                        SGcount, data_transfer, residual);
1602                                 }
1603 #endif
1604                                 data_transfer += residual;
1605
1606                                 if(data_transfer != 0) {
1607                                         int count;
1608                                         __u32 pAddr;
1609
1610                                         SGcount--;
1611
1612                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1613                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1614                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1615                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1616                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1617                                         pAddr += (count - data_transfer);
1618 #ifdef NCR_700_DEBUG
1619                                         if(pAddr != naddr) {
1620                                                 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1621                                         }
1622 #endif
1623                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1624                                 }
1625                                 /* set the executed moves to nops */
1626                                 for(i=0; i<SGcount; i++) {
1627                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1628                                         slot->SG[i].pAddr = 0;
1629                                 }
1630                                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1631                                 /* and pretend we disconnected after
1632                                  * the command phase */
1633                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1634                                 /* make sure all the data is flushed */
1635                                 NCR_700_flush_fifo(host);
1636                         } else {
1637                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1638                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1639                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1640                                 NCR_700_internal_bus_reset(host);
1641                         }
1642
1643                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1644                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1645                                host->host_no, pun, lun);
1646                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1647                 } else if(sstat0 & PARITY_ERROR) {
1648                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1649                                host->host_no, pun, lun);
1650                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1651                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1652                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1653                                host->host_no, pun, lun));
1654                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1655                 } else if(dstat & (ILGL_INST_DETECTED)) {
1656                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1657                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1658                                host->host_no, pun, lun,
1659                                dsp, dsp - hostdata->pScript);
1660                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1662                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1663                                host->host_no, pun, lun, dstat);
1664                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665                 }
1666
1667
1668                 /* NOTE: selection interrupt processing MUST occur
1669                  * after script interrupt processing to correctly cope
1670                  * with the case where we process a disconnect and
1671                  * then get reselected before we process the
1672                  * disconnection */
1673                 if(sstat0 & SELECTED) {
1674                         /* FIXME: It currently takes at least FOUR
1675                          * interrupts to complete a command that
1676                          * disconnects: one for the disconnect, one
1677                          * for the reselection, one to get the
1678                          * reselection data and one to complete the
1679                          * command.  If we guess the reselected
1680                          * command here and prepare it, we only need
1681                          * to get a reselection data interrupt if we
1682                          * guessed wrongly.  Since the interrupt
1683                          * overhead is much greater than the command
1684                          * setup, this would be an efficient
1685                          * optimisation particularly as we probably
1686                          * only have one outstanding command on a
1687                          * target most of the time */
1688
1689                         resume_offset = process_selection(host, dsp);
1690
1691                 }
1692
1693         }
1694
1695         if(resume_offset) {
1696                 if(hostdata->state != NCR_700_HOST_BUSY) {
1697                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1698                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1699                         hostdata->state = NCR_700_HOST_BUSY;
1700                 }
1701
1702                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1703                 NCR_700_clear_fifo(host);
1704                 NCR_700_writel(resume_offset, host, DSP_REG);
1705         }
1706         /* There is probably a technical no-no about this: If we're a
1707          * shared interrupt and we got this interrupt because the
1708          * other device needs servicing not us, we're still going to
1709          * check our queued commands here---of course, there shouldn't
1710          * be any outstanding.... */
1711         if(hostdata->state == NCR_700_HOST_FREE) {
1712                 int i;
1713
1714                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1715                         /* fairness: always run the queue from the last
1716                          * position we left off */
1717                         int j = (i + hostdata->saved_slot_position)
1718                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1719
1720                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1721                                 continue;
1722                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1723                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1724                                        host->host_no, &hostdata->slots[j],
1725                                        hostdata->slots[j].cmnd));
1726                                 hostdata->saved_slot_position = j + 1;
1727                         }
1728
1729                         break;
1730                 }
1731         }
1732  out_unlock:
1733         spin_unlock_irqrestore(host->host_lock, flags);
1734         return IRQ_RETVAL(handled);
1735 }
1736
1737 STATIC int
1738 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1739 {
1740         struct NCR_700_Host_Parameters *hostdata =
1741                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1742         __u32 move_ins;
1743         enum dma_data_direction direction;
1744         struct NCR_700_command_slot *slot;
1745
1746         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1747                 /* We're over our allocation, this should never happen
1748                  * since we report the max allocation to the mid layer */
1749                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1750                 return 1;
1751         }
1752         /* check for untagged commands.  We cannot have any outstanding
1753          * commands if we accept them.  Commands could be untagged because:
1754          *
1755          * - The tag negotiated bitmap is clear
1756          * - The blk layer sent and untagged command
1757          */
1758         if(NCR_700_get_depth(SCp->device) != 0
1759            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1760                || !blk_rq_tagged(SCp->request))) {
1761                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1762                        NCR_700_get_depth(SCp->device));
1763                 return SCSI_MLQUEUE_DEVICE_BUSY;
1764         }
1765         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1766                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1767                        NCR_700_get_depth(SCp->device));
1768                 return SCSI_MLQUEUE_DEVICE_BUSY;
1769         }
1770         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1771
1772         /* begin the command here */
1773         /* no need to check for NULL, test for command_slot_count above
1774          * ensures a slot is free */
1775         slot = find_empty_slot(hostdata);
1776
1777         slot->cmnd = SCp;
1778
1779         SCp->scsi_done = done;
1780         SCp->host_scribble = (unsigned char *)slot;
1781         SCp->SCp.ptr = NULL;
1782         SCp->SCp.buffer = NULL;
1783
1784 #ifdef NCR_700_DEBUG
1785         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1786         scsi_print_command(SCp);
1787 #endif
1788         if(blk_rq_tagged(SCp->request)
1789            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1790            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1791                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1792                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1793                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1794         }
1795
1796         /* here we may have to process an untagged command.  The gate
1797          * above ensures that this will be the only one outstanding,
1798          * so clear the tag negotiated bit.
1799          *
1800          * FIXME: This will royally screw up on multiple LUN devices
1801          * */
1802         if(!blk_rq_tagged(SCp->request)
1803            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1804                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1805                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1806         }
1807
1808         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1809            && scsi_get_tag_type(SCp->device)) {
1810                 slot->tag = SCp->request->tag;
1811                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1812                        slot->tag, slot);
1813         } else {
1814                 slot->tag = SCSI_NO_TAG;
1815                 /* must populate current_cmnd for scsi_find_tag to work */
1816                 SCp->device->current_cmnd = SCp;
1817         }
1818         /* sanity check: some of the commands generated by the mid-layer
1819          * have an eccentric idea of their sc_data_direction */
1820         if(!SCp->use_sg && !SCp->request_bufflen
1821            && SCp->sc_data_direction != DMA_NONE) {
1822 #ifdef NCR_700_DEBUG
1823                 printk("53c700: Command");
1824                 scsi_print_command(SCp);
1825                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1826 #endif
1827                 SCp->sc_data_direction = DMA_NONE;
1828         }
1829
1830         switch (SCp->cmnd[0]) {
1831         case REQUEST_SENSE:
1832                 /* clear the internal sense magic */
1833                 SCp->cmnd[6] = 0;
1834                 /* fall through */
1835         default:
1836                 /* OK, get it from the command */
1837                 switch(SCp->sc_data_direction) {
1838                 case DMA_BIDIRECTIONAL:
1839                 default:
1840                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1841                         scsi_print_command(SCp);
1842
1843                         move_ins = 0;
1844                         break;
1845                 case DMA_NONE:
1846                         move_ins = 0;
1847                         break;
1848                 case DMA_FROM_DEVICE:
1849                         move_ins = SCRIPT_MOVE_DATA_IN;
1850                         break;
1851                 case DMA_TO_DEVICE:
1852                         move_ins = SCRIPT_MOVE_DATA_OUT;
1853                         break;
1854                 }
1855         }
1856
1857         /* now build the scatter gather list */
1858         direction = SCp->sc_data_direction;
1859         if(move_ins != 0) {
1860                 int i;
1861                 int sg_count;
1862                 dma_addr_t vPtr = 0;
1863                 __u32 count = 0;
1864
1865                 if(SCp->use_sg) {
1866                         sg_count = dma_map_sg(hostdata->dev,
1867                                               SCp->request_buffer, SCp->use_sg,
1868                                               direction);
1869                 } else {
1870                         vPtr = dma_map_single(hostdata->dev,
1871                                               SCp->request_buffer,
1872                                               SCp->request_bufflen,
1873                                               direction);
1874                         count = SCp->request_bufflen;
1875                         slot->dma_handle = vPtr;
1876                         sg_count = 1;
1877                 }
1878
1879
1880                 for(i = 0; i < sg_count; i++) {
1881
1882                         if(SCp->use_sg) {
1883                                 struct scatterlist *sg = SCp->request_buffer;
1884
1885                                 vPtr = sg_dma_address(&sg[i]);
1886                                 count = sg_dma_len(&sg[i]);
1887                         }
1888
1889                         slot->SG[i].ins = bS_to_host(move_ins | count);
1890                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1891                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1892                         slot->SG[i].pAddr = bS_to_host(vPtr);
1893                 }
1894                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1895                 slot->SG[i].pAddr = 0;
1896                 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1897                 DEBUG((" SETTING %08lx to %x\n",
1898                        (&slot->pSG[i].ins),
1899                        slot->SG[i].ins));
1900         }
1901         slot->resume_offset = 0;
1902         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1903                                     sizeof(SCp->cmnd), DMA_TO_DEVICE);
1904         NCR_700_start_command(SCp);
1905         return 0;
1906 }
1907
1908 STATIC int
1909 NCR_700_abort(struct scsi_cmnd * SCp)
1910 {
1911         struct NCR_700_command_slot *slot;
1912
1913         scmd_printk(KERN_INFO, SCp,
1914                 "New error handler wants to abort command\n\t");
1915         scsi_print_command(SCp);
1916
1917         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1918
1919         if(slot == NULL)
1920                 /* no outstanding command to abort */
1921                 return SUCCESS;
1922         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1923                 /* FIXME: This is because of a problem in the new
1924                  * error handler.  When it is in error recovery, it
1925                  * will send a TUR to a device it thinks may still be
1926                  * showing a problem.  If the TUR isn't responded to,
1927                  * it will abort it and mark the device off line.
1928                  * Unfortunately, it does no other error recovery, so
1929                  * this would leave us with an outstanding command
1930                  * occupying a slot.  Rather than allow this to
1931                  * happen, we issue a bus reset to force all
1932                  * outstanding commands to terminate here. */
1933                 NCR_700_internal_bus_reset(SCp->device->host);
1934                 /* still drop through and return failed */
1935         }
1936         return FAILED;
1937
1938 }
1939
1940 STATIC int
1941 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1942 {
1943         DECLARE_COMPLETION(complete);
1944         struct NCR_700_Host_Parameters *hostdata =
1945                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1946
1947         scmd_printk(KERN_INFO, SCp,
1948                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1949         scsi_print_command(SCp);
1950
1951         /* In theory, eh_complete should always be null because the
1952          * eh is single threaded, but just in case we're handling a
1953          * reset via sg or something */
1954         spin_lock_irq(SCp->device->host->host_lock);
1955         while (hostdata->eh_complete != NULL) {
1956                 spin_unlock_irq(SCp->device->host->host_lock);
1957                 msleep_interruptible(100);
1958                 spin_lock_irq(SCp->device->host->host_lock);
1959         }
1960
1961         hostdata->eh_complete = &complete;
1962         NCR_700_internal_bus_reset(SCp->device->host);
1963
1964         spin_unlock_irq(SCp->device->host->host_lock);
1965         wait_for_completion(&complete);
1966         spin_lock_irq(SCp->device->host->host_lock);
1967
1968         hostdata->eh_complete = NULL;
1969         /* Revalidate the transport parameters of the failing device */
1970         if(hostdata->fast)
1971                 spi_schedule_dv_device(SCp->device);
1972
1973         spin_unlock_irq(SCp->device->host->host_lock);
1974         return SUCCESS;
1975 }
1976
1977 STATIC int
1978 NCR_700_host_reset(struct scsi_cmnd * SCp)
1979 {
1980         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1981         scsi_print_command(SCp);
1982
1983         spin_lock_irq(SCp->device->host->host_lock);
1984
1985         NCR_700_internal_bus_reset(SCp->device->host);
1986         NCR_700_chip_reset(SCp->device->host);
1987
1988         spin_unlock_irq(SCp->device->host->host_lock);
1989
1990         return SUCCESS;
1991 }
1992
1993 STATIC void
1994 NCR_700_set_period(struct scsi_target *STp, int period)
1995 {
1996         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1997         struct NCR_700_Host_Parameters *hostdata =
1998                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1999
2000         if(!hostdata->fast)
2001                 return;
2002
2003         if(period < hostdata->min_period)
2004                 period = hostdata->min_period;
2005
2006         spi_period(STp) = period;
2007         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2008                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2009         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2010 }
2011
2012 STATIC void
2013 NCR_700_set_offset(struct scsi_target *STp, int offset)
2014 {
2015         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2016         struct NCR_700_Host_Parameters *hostdata =
2017                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2018         int max_offset = hostdata->chip710
2019                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2020
2021         if(!hostdata->fast)
2022                 return;
2023
2024         if(offset > max_offset)
2025                 offset = max_offset;
2026
2027         /* if we're currently async, make sure the period is reasonable */
2028         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2029                                     spi_period(STp) > 0xff))
2030                 spi_period(STp) = hostdata->min_period;
2031
2032         spi_offset(STp) = offset;
2033         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2034                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2035         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2036 }
2037
2038
2039
2040 STATIC int
2041 NCR_700_slave_configure(struct scsi_device *SDp)
2042 {
2043         struct NCR_700_Host_Parameters *hostdata =
2044                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2045
2046         SDp->hostdata = kmalloc(GFP_KERNEL, sizeof(struct NCR_700_sense));
2047
2048         if (!SDp->hostdata)
2049                 return -ENOMEM;
2050
2051         /* to do here: allocate memory; build a queue_full list */
2052         if(SDp->tagged_supported) {
2053                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2054                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2055                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2056         } else {
2057                 /* initialise to default depth */
2058                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2059         }
2060         if(hostdata->fast) {
2061                 /* Find the correct offset and period via domain validation */
2062                 if (!spi_initial_dv(SDp->sdev_target))
2063                         spi_dv_device(SDp);
2064         } else {
2065                 spi_offset(SDp->sdev_target) = 0;
2066                 spi_period(SDp->sdev_target) = 0;
2067         }
2068         return 0;
2069 }
2070
2071 STATIC void
2072 NCR_700_slave_destroy(struct scsi_device *SDp)
2073 {
2074         kfree(SDp->hostdata);
2075         SDp->hostdata = NULL;
2076 }
2077
2078 static int
2079 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2080 {
2081         if (depth > NCR_700_MAX_TAGS)
2082                 depth = NCR_700_MAX_TAGS;
2083
2084         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2085         return depth;
2086 }
2087
2088 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2089 {
2090         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2091                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2092         struct NCR_700_Host_Parameters *hostdata =
2093                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2094
2095         scsi_set_tag_type(SDp, tag_type);
2096
2097         /* We have a global (per target) flag to track whether TCQ is
2098          * enabled, so we'll be turning it off for the entire target here.
2099          * our tag algorithm will fail if we mix tagged and untagged commands,
2100          * so quiesce the device before doing this */
2101         if (change_tag)
2102                 scsi_target_quiesce(SDp->sdev_target);
2103
2104         if (!tag_type) {
2105                 /* shift back to the default unqueued number of commands
2106                  * (the user can still raise this) */
2107                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2108                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2109         } else {
2110                 /* Here, we cleared the negotiation flag above, so this
2111                  * will force the driver to renegotiate */
2112                 scsi_activate_tcq(SDp, SDp->queue_depth);
2113                 if (change_tag)
2114                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2115         }
2116         if (change_tag)
2117                 scsi_target_resume(SDp->sdev_target);
2118
2119         return tag_type;
2120 }
2121
2122 static ssize_t
2123 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2124 {
2125         struct scsi_device *SDp = to_scsi_device(dev);
2126
2127         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2128 }
2129
2130 static struct device_attribute NCR_700_active_tags_attr = {
2131         .attr = {
2132                 .name =         "active_tags",
2133                 .mode =         S_IRUGO,
2134         },
2135         .show = NCR_700_show_active_tags,
2136 };
2137
2138 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2139         &NCR_700_active_tags_attr,
2140         NULL,
2141 };
2142
2143 EXPORT_SYMBOL(NCR_700_detect);
2144 EXPORT_SYMBOL(NCR_700_release);
2145 EXPORT_SYMBOL(NCR_700_intr);
2146
2147 static struct spi_function_template NCR_700_transport_functions =  {
2148         .set_period     = NCR_700_set_period,
2149         .show_period    = 1,
2150         .set_offset     = NCR_700_set_offset,
2151         .show_offset    = 1,
2152 };
2153
2154 static int __init NCR_700_init(void)
2155 {
2156         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2157         if(!NCR_700_transport_template)
2158                 return -ENODEV;
2159         return 0;
2160 }
2161
2162 static void __exit NCR_700_exit(void)
2163 {
2164         spi_release_transport(NCR_700_transport_template);
2165 }
2166
2167 module_init(NCR_700_init);
2168 module_exit(NCR_700_exit);
2169