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/slab.h>
 121 #include <linux/ioport.h>
 122 #include <linux/delay.h>
 123 #include <linux/spinlock.h>
 124 #include <linux/completion.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/io.h>
 133 #include <asm/pgtable.h>
 134 #include <asm/byteorder.h>
 135
 136 #include <scsi/scsi.h>
 137 #include <scsi/scsi_cmnd.h>
 138 #include <scsi/scsi_dbg.h>
 139 #include <scsi/scsi_eh.h>
 140 #include <scsi/scsi_host.h>
 141 #include <scsi/scsi_tcq.h>
 142 #include <scsi/scsi_transport.h>
 143 #include <scsi/scsi_transport_spi.h>
 144
 145 #include "53c700.h"
 146
 147 /* NOTE: For 64 bit drivers there are points in the code where we use
 148  * a non dereferenceable pointer to point to a structure in dma-able
 149  * memory (which is 32 bits) so that we can use all of the structure
 150  * operations but take the address at the end.  This macro allows us
 151  * to truncate the 64 bit pointer down to 32 bits without the compiler
 152  * complaining */
 153 #define to32bit(x)      ((__u32)((unsigned long)(x)))
 154
 155 #ifdef NCR_700_DEBUG
 156 #define STATIC
 157 #else
 158 #define STATIC static
 159 #endif
 160
 161 MODULE_AUTHOR("James Bottomley");
 162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
 163 MODULE_LICENSE("GPL");
 164
 165 /* This is the script */
 166 #include "53c700_d.h"
 167
 168
 169 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
 170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
 171 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
 172 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
 173 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
 174 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
 175 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
 176 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
 177 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
 178
 179 STATIC struct device_attribute *NCR_700_dev_attrs[];
 180
 181 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 182
 183 static char *NCR_700_phase[] = {
 184         "",
 185         "after selection",
 186         "before command phase",
 187         "after command phase",
 188         "after status phase",
 189         "after data in phase",
 190         "after data out phase",
 191         "during data phase",
 192 };
 193
 194 static char *NCR_700_condition[] = {
 195         "",
 196         "NOT MSG_OUT",
 197         "UNEXPECTED PHASE",
 198         "NOT MSG_IN",
 199         "UNEXPECTED MSG",
 200         "MSG_IN",
 201         "SDTR_MSG RECEIVED",
 202         "REJECT_MSG RECEIVED",
 203         "DISCONNECT_MSG RECEIVED",
 204         "MSG_OUT",
 205         "DATA_IN",
 206
 207 };
 208
 209 static char *NCR_700_fatal_messages[] = {
 210         "unexpected message after reselection",
 211         "still MSG_OUT after message injection",
 212         "not MSG_IN after selection",
 213         "Illegal message length received",
 214 };
 215
 216 static char *NCR_700_SBCL_bits[] = {
 217         "IO ",
 218         "CD ",
 219         "MSG ",
 220         "ATN ",
 221         "SEL ",
 222         "BSY ",
 223         "ACK ",
 224         "REQ ",
 225 };
 226
 227 static char *NCR_700_SBCL_to_phase[] = {
 228         "DATA_OUT",
 229         "DATA_IN",
 230         "CMD_OUT",
 231         "STATE",
 232         "ILLEGAL PHASE",
 233         "ILLEGAL PHASE",
 234         "MSG OUT",
 235         "MSG IN",
 236 };
 237
 238 /* This translates the SDTR message offset and period to a value
 239  * which can be loaded into the SXFER_REG.
 240  *
 241  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 242  *       actually four times this period value */
 243 static inline __u8
 244 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 245                                __u8 offset, __u8 period)
 246 {
 247         int XFERP;
 248
 249         __u8 min_xferp = (hostdata->chip710
 250                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 251         __u8 max_offset = (hostdata->chip710
 252                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 253
 254         if(offset == 0)
 255                 return 0;
 256
 257         if(period < hostdata->min_period) {
 258                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 259                 period = hostdata->min_period;
 260         }
 261         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 262         if(offset > max_offset) {
 263                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 264                        offset, max_offset);
 265                 offset = max_offset;
 266         }
 267         if(XFERP < min_xferp) {
 268                 XFERP =  min_xferp;
 269         }
 270         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 271 }
 272
 273 static inline __u8
 274 NCR_700_get_SXFER(struct scsi_device *SDp)
 275 {
 276         struct NCR_700_Host_Parameters *hostdata =
 277                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 278
 279         return NCR_700_offset_period_to_sxfer(hostdata,
 280                                               spi_offset(SDp->sdev_target),
 281                                               spi_period(SDp->sdev_target));
 282 }
 283
 284 struct Scsi_Host *
 285 NCR_700_detect(struct scsi_host_template *tpnt,
 286                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 287 {
 288         dma_addr_t pScript, pSlots;
 289         __u8 *memory;
 290         __u32 *script;
 291         struct Scsi_Host *host;
 292         static int banner = 0;
 293         int j;
 294
 295         if(tpnt->sdev_attrs == NULL)
 296                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 297
 298         memory = dma_alloc_attrs(dev, TOTAL_MEM_SIZE, &pScript,
 299                                  GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
 300         if(memory == NULL) {
 301                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
 302                 return NULL;
 303         }
 304
 305         script = (__u32 *)memory;
 306         hostdata->msgin = memory + MSGIN_OFFSET;
 307         hostdata->msgout = memory + MSGOUT_OFFSET;
 308         hostdata->status = memory + STATUS_OFFSET;
 309         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 310         hostdata->dev = dev;
 311
 312         pSlots = pScript + SLOTS_OFFSET;
 313
 314         /* Fill in the missing routines from the host template */
 315         tpnt->queuecommand = NCR_700_queuecommand;
 316         tpnt->eh_abort_handler = NCR_700_abort;
 317         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 318         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 319         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 320         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 321         tpnt->slave_configure = NCR_700_slave_configure;
 322         tpnt->slave_destroy = NCR_700_slave_destroy;
 323         tpnt->slave_alloc = NCR_700_slave_alloc;
 324         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 325
 326         if(tpnt->name == NULL)
 327                 tpnt->name = "53c700";
 328         if(tpnt->proc_name == NULL)
 329                 tpnt->proc_name = "53c700";
 330
 331         host = scsi_host_alloc(tpnt, 4);
 332         if (!host)
 333                 return NULL;
 334         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 335                * NCR_700_COMMAND_SLOTS_PER_HOST);
 336         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 337                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 338                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 339                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 340                 if(j == 0)
 341                         hostdata->free_list = &hostdata->slots[j];
 342                 else
 343                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 344                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 345         }
 346
 347         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 348                 script[j] = bS_to_host(SCRIPT[j]);
 349
 350         /* adjust all labels to be bus physical */
 351         for (j = 0; j < PATCHES; j++)
 352                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 353         /* now patch up fixed addresses. */
 354         script_patch_32(hostdata->dev, script, MessageLocation,
 355                         pScript + MSGOUT_OFFSET);
 356         script_patch_32(hostdata->dev, script, StatusAddress,
 357                         pScript + STATUS_OFFSET);
 358         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
 359                         pScript + MSGIN_OFFSET);
 360
 361         hostdata->script = script;
 362         hostdata->pScript = pScript;
 363         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 364         hostdata->state = NCR_700_HOST_FREE;
 365         hostdata->cmd = NULL;
 366         host->max_id = 8;
 367         host->max_lun = NCR_700_MAX_LUNS;
 368         BUG_ON(NCR_700_transport_template == NULL);
 369         host->transportt = NCR_700_transport_template;
 370         host->unique_id = (unsigned long)hostdata->base;
 371         hostdata->eh_complete = NULL;
 372         host->hostdata[0] = (unsigned long)hostdata;
 373         /* kick the chip */
 374         NCR_700_writeb(0xff, host, CTEST9_REG);
 375         if (hostdata->chip710)
 376                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 377         else
 378                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 379         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 380         if (banner == 0) {
 381                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 382                 banner = 1;
 383         }
 384         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 385                hostdata->chip710 ? "53c710" :
 386                (hostdata->fast ? "53c700-66" : "53c700"),
 387                hostdata->rev, hostdata->differential ?
 388                "(Differential)" : "");
 389         /* reset the chip */
 390         NCR_700_chip_reset(host);
 391
 392         if (scsi_add_host(host, dev)) {
 393                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 394                 scsi_host_put(host);
 395                 return NULL;
 396         }
 397
 398         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 399                 SPI_SIGNAL_SE;
 400
 401         return host;
 402 }
 403
 404 int
 405 NCR_700_release(struct Scsi_Host *host)
 406 {
 407         struct NCR_700_Host_Parameters *hostdata =
 408                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 409
 410         dma_free_attrs(hostdata->dev, TOTAL_MEM_SIZE, hostdata->script,
 411                        hostdata->pScript, DMA_ATTR_NON_CONSISTENT);
 412         return 1;
 413 }
 414
 415 static inline __u8
 416 NCR_700_identify(int can_disconnect, __u8 lun)
 417 {
 418         return IDENTIFY_BASE |
 419                 ((can_disconnect) ? 0x40 : 0) |
 420                 (lun & NCR_700_LUN_MASK);
 421 }
 422
 423 /*
 424  * Function : static int data_residual (Scsi_Host *host)
 425  *
 426  * Purpose : return residual data count of what's in the chip.  If you
 427  * really want to know what this function is doing, it's almost a
 428  * direct transcription of the algorithm described in the 53c710
 429  * guide, except that the DBC and DFIFO registers are only 6 bits
 430  * wide on a 53c700.
 431  *
 432  * Inputs : host - SCSI host */
 433 static inline int
 434 NCR_700_data_residual (struct Scsi_Host *host) {
 435         struct NCR_700_Host_Parameters *hostdata =
 436                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 437         int count, synchronous = 0;
 438         unsigned int ddir;
 439
 440         if(hostdata->chip710) {
 441                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 442                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 443         } else {
 444                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 445                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 446         }
 447
 448         if(hostdata->fast)
 449                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 450
 451         /* get the data direction */
 452         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 453
 454         if (ddir) {
 455                 /* Receive */
 456                 if (synchronous)
 457                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 458                 else
 459                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 460                                 ++count;
 461         } else {
 462                 /* Send */
 463                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 464                 if (sstat & SODL_REG_FULL)
 465                         ++count;
 466                 if (synchronous && (sstat & SODR_REG_FULL))
 467                         ++count;
 468         }
 469 #ifdef NCR_700_DEBUG
 470         if(count)
 471                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 472 #endif
 473         return count;
 474 }
 475
 476 /* print out the SCSI wires and corresponding phase from the SBCL register
 477  * in the chip */
 478 static inline char *
 479 sbcl_to_string(__u8 sbcl)
 480 {
 481         int i;
 482         static char ret[256];
 483
 484         ret[0]='\0';
 485         for(i=0; i<8; i++) {
 486                 if((1<<i) & sbcl)
 487                         strcat(ret, NCR_700_SBCL_bits[i]);
 488         }
 489         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 490         return ret;
 491 }
 492
 493 static inline __u8
 494 bitmap_to_number(__u8 bitmap)
 495 {
 496         __u8 i;
 497
 498         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 499                 ;
 500         return i;
 501 }
 502
 503 /* Pull a slot off the free list */
 504 STATIC struct NCR_700_command_slot *
 505 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 506 {
 507         struct NCR_700_command_slot *slot = hostdata->free_list;
 508
 509         if(slot == NULL) {
 510                 /* sanity check */
 511                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 512                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 513                 return NULL;
 514         }
 515
 516         if(slot->state != NCR_700_SLOT_FREE)
 517                 /* should panic! */
 518                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 519
 520
 521         hostdata->free_list = slot->ITL_forw;
 522         slot->ITL_forw = NULL;
 523
 524
 525         /* NOTE: set the state to busy here, not queued, since this
 526          * indicates the slot is in use and cannot be run by the IRQ
 527          * finish routine.  If we cannot queue the command when it
 528          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 529         slot->state = NCR_700_SLOT_BUSY;
 530         slot->flags = 0;
 531         hostdata->command_slot_count++;
 532
 533         return slot;
 534 }
 535
 536 STATIC void
 537 free_slot(struct NCR_700_command_slot *slot,
 538           struct NCR_700_Host_Parameters *hostdata)
 539 {
 540         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 541                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 542         }
 543         if(slot->state == NCR_700_SLOT_FREE) {
 544                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 545         }
 546
 547         slot->resume_offset = 0;
 548         slot->cmnd = NULL;
 549         slot->state = NCR_700_SLOT_FREE;
 550         slot->ITL_forw = hostdata->free_list;
 551         hostdata->free_list = slot;
 552         hostdata->command_slot_count--;
 553 }
 554
 555
 556 /* This routine really does very little.  The command is indexed on
 557    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 558 STATIC void
 559 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 560                      struct scsi_cmnd *SCp, __u32 dsp)
 561 {
 562         /* Its just possible that this gets executed twice */
 563         if(SCp != NULL) {
 564                 struct NCR_700_command_slot *slot =
 565                         (struct NCR_700_command_slot *)SCp->host_scribble;
 566
 567                 slot->resume_offset = dsp;
 568         }
 569         hostdata->state = NCR_700_HOST_FREE;
 570         hostdata->cmd = NULL;
 571 }
 572
 573 STATIC inline void
 574 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 575               struct NCR_700_command_slot *slot)
 576 {
 577         if(SCp->sc_data_direction != DMA_NONE &&
 578            SCp->sc_data_direction != DMA_BIDIRECTIONAL)
 579                 scsi_dma_unmap(SCp);
 580 }
 581
 582 STATIC inline void
 583 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 584                struct scsi_cmnd *SCp, int result)
 585 {
 586         hostdata->state = NCR_700_HOST_FREE;
 587         hostdata->cmd = NULL;
 588
 589         if(SCp != NULL) {
 590                 struct NCR_700_command_slot *slot =
 591                         (struct NCR_700_command_slot *)SCp->host_scribble;
 592
 593                 dma_unmap_single(hostdata->dev, slot->pCmd,
 594                                  MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 595                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 596                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 597
 598                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 599                                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 600                         /* restore the old result if the request sense was
 601                          * successful */
 602                         if (result == 0)
 603                                 result = cmnd[7];
 604                         /* restore the original length */
 605                         SCp->cmd_len = cmnd[8];
 606                 } else
 607                         NCR_700_unmap(hostdata, SCp, slot);
 608
 609                 free_slot(slot, hostdata);
 610 #ifdef NCR_700_DEBUG
 611                 if(NCR_700_get_depth(SCp->device) == 0 ||
 612                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 613                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 614                                NCR_700_get_depth(SCp->device));
 615 #endif /* NCR_700_DEBUG */
 616                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 617
 618                 SCp->host_scribble = NULL;
 619                 SCp->result = result;
 620                 SCp->scsi_done(SCp);
 621         } else {
 622                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 623         }
 624 }
 625
 626
 627 STATIC void
 628 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 629 {
 630         /* Bus reset */
 631         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 632         udelay(50);
 633         NCR_700_writeb(0, host, SCNTL1_REG);
 634
 635 }
 636
 637 STATIC void
 638 NCR_700_chip_setup(struct Scsi_Host *host)
 639 {
 640         struct NCR_700_Host_Parameters *hostdata =
 641                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 642         __u8 min_period;
 643         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 644
 645         if(hostdata->chip710) {
 646                 __u8 burst_disable = 0;
 647                 __u8 burst_length = 0;
 648
 649                 switch (hostdata->burst_length) {
 650                         case 1:
 651                                 burst_length = BURST_LENGTH_1;
 652                                 break;
 653                         case 2:
 654                                 burst_length = BURST_LENGTH_2;
 655                                 break;
 656                         case 4:
 657                                 burst_length = BURST_LENGTH_4;
 658                                 break;
 659                         case 8:
 660                                 burst_length = BURST_LENGTH_8;
 661                                 break;
 662                         default:
 663                                 burst_disable = BURST_DISABLE;
 664                                 break;
 665                 }
 666                 hostdata->dcntl_extra |= COMPAT_700_MODE;
 667
 668                 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
 669                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
 670                                host, DMODE_710_REG);
 671                 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
 672                                (hostdata->differential ? DIFF : 0),
 673                                host, CTEST7_REG);
 674                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 675                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 676                                | AUTO_ATN, host, SCNTL0_REG);
 677         } else {
 678                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 679                                host, DMODE_700_REG);
 680                 NCR_700_writeb(hostdata->differential ?
 681                                DIFF : 0, host, CTEST7_REG);
 682                 if(hostdata->fast) {
 683                         /* this is for 700-66, does nothing on 700 */
 684                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 685                                        | GENERATE_RECEIVE_PARITY, host,
 686                                        CTEST8_REG);
 687                 } else {
 688                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 689                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 690                 }
 691         }
 692
 693         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 694         NCR_700_writeb(0, host, SBCL_REG);
 695         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 696
 697         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 698              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 699
 700         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 701         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 702         if(hostdata->clock > 75) {
 703                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 704                 /* do the best we can, but the async clock will be out
 705                  * of spec: sync divider 2, async divider 3 */
 706                 DEBUG(("53c700: sync 2 async 3\n"));
 707                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 708                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 709                 hostdata->sync_clock = hostdata->clock/2;
 710         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 711                 /* sync divider 1.5, async divider 3 */
 712                 DEBUG(("53c700: sync 1.5 async 3\n"));
 713                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 714                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 715                 hostdata->sync_clock = hostdata->clock*2;
 716                 hostdata->sync_clock /= 3;
 717
 718         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 719                 /* sync divider 1, async divider 2 */
 720                 DEBUG(("53c700: sync 1 async 2\n"));
 721                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 722                 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 723                 hostdata->sync_clock = hostdata->clock;
 724         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 725                 /* sync divider 1, async divider 1.5 */
 726                 DEBUG(("53c700: sync 1 async 1.5\n"));
 727                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 728                 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
 729                 hostdata->sync_clock = hostdata->clock;
 730         } else {
 731                 DEBUG(("53c700: sync 1 async 1\n"));
 732                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 733                 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 734                 /* sync divider 1, async divider 1 */
 735                 hostdata->sync_clock = hostdata->clock;
 736         }
 737         /* Calculate the actual minimum period that can be supported
 738          * by our synchronous clock speed.  See the 710 manual for
 739          * exact details of this calculation which is based on a
 740          * setting of the SXFER register */
 741         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 742         hostdata->min_period = NCR_700_MIN_PERIOD;
 743         if(min_period > NCR_700_MIN_PERIOD)
 744                 hostdata->min_period = min_period;
 745 }
 746
 747 STATIC void
 748 NCR_700_chip_reset(struct Scsi_Host *host)
 749 {
 750         struct NCR_700_Host_Parameters *hostdata =
 751                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 752         if(hostdata->chip710) {
 753                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 754                 udelay(100);
 755
 756                 NCR_700_writeb(0, host, ISTAT_REG);
 757         } else {
 758                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 759                 udelay(100);
 760
 761                 NCR_700_writeb(0, host, DCNTL_REG);
 762         }
 763
 764         mdelay(1000);
 765
 766         NCR_700_chip_setup(host);
 767 }
 768
 769 /* The heart of the message processing engine is that the instruction
 770  * immediately after the INT is the normal case (and so must be CLEAR
 771  * ACK).  If we want to do something else, we call that routine in
 772  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 773  * ACK) so that the routine returns correctly to resume its activity
 774  * */
 775 STATIC __u32
 776 process_extended_message(struct Scsi_Host *host,
 777                          struct NCR_700_Host_Parameters *hostdata,
 778                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 779 {
 780         __u32 resume_offset = dsp, temp = dsp + 8;
 781         __u8 pun = 0xff, lun = 0xff;
 782
 783         if(SCp != NULL) {
 784                 pun = SCp->device->id;
 785                 lun = SCp->device->lun;
 786         }
 787
 788         switch(hostdata->msgin[2]) {
 789         case A_SDTR_MSG:
 790                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 791                         struct scsi_target *starget = SCp->device->sdev_target;
 792                         __u8 period = hostdata->msgin[3];
 793                         __u8 offset = hostdata->msgin[4];
 794
 795                         if(offset == 0 || period == 0) {
 796                                 offset = 0;
 797                                 period = 0;
 798                         }
 799
 800                         spi_offset(starget) = offset;
 801                         spi_period(starget) = period;
 802
 803                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 804                                 spi_display_xfer_agreement(starget);
 805                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 806                         }
 807
 808                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 809                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 810
 811                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 812                                        host, SXFER_REG);
 813
 814                 } else {
 815                         /* SDTR message out of the blue, reject it */
 816                         shost_printk(KERN_WARNING, host,
 817                                 "Unexpected SDTR msg\n");
 818                         hostdata->msgout[0] = A_REJECT_MSG;
 819                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 820                         script_patch_16(hostdata->dev, hostdata->script,
 821                                         MessageCount, 1);
 822                         /* SendMsgOut returns, so set up the return
 823                          * address */
 824                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 825                 }
 826                 break;
 827
 828         case A_WDTR_MSG:
 829                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 830                        host->host_no, pun, lun);
 831                 hostdata->msgout[0] = A_REJECT_MSG;
 832                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 833                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 834                                 1);
 835                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 836
 837                 break;
 838
 839         default:
 840                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 841                        host->host_no, pun, lun,
 842                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 843                 spi_print_msg(hostdata->msgin);
 844                 printk("\n");
 845                 /* just reject it */
 846                 hostdata->msgout[0] = A_REJECT_MSG;
 847                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 848                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 849                                 1);
 850                 /* SendMsgOut returns, so set up the return
 851                  * address */
 852                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 853         }
 854         NCR_700_writel(temp, host, TEMP_REG);
 855         return resume_offset;
 856 }
 857
 858 STATIC __u32
 859 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 860                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 861 {
 862         /* work out where to return to */
 863         __u32 temp = dsp + 8, resume_offset = dsp;
 864         __u8 pun = 0xff, lun = 0xff;
 865
 866         if(SCp != NULL) {
 867                 pun = SCp->device->id;
 868                 lun = SCp->device->lun;
 869         }
 870
 871 #ifdef NCR_700_DEBUG
 872         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 873                NCR_700_phase[(dsps & 0xf00) >> 8]);
 874         spi_print_msg(hostdata->msgin);
 875         printk("\n");
 876 #endif
 877
 878         switch(hostdata->msgin[0]) {
 879
 880         case A_EXTENDED_MSG:
 881                 resume_offset =  process_extended_message(host, hostdata, SCp,
 882                                                           dsp, dsps);
 883                 break;
 884
 885         case A_REJECT_MSG:
 886                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 887                         /* Rejected our sync negotiation attempt */
 888                         spi_period(SCp->device->sdev_target) =
 889                                 spi_offset(SCp->device->sdev_target) = 0;
 890                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 891                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 892                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 893                         /* rejected our first simple tag message */
 894                         scmd_printk(KERN_WARNING, SCp,
 895                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 896                         /* we're done negotiating */
 897                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 898                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 899
 900                         SCp->device->tagged_supported = 0;
 901                         SCp->device->simple_tags = 0;
 902                         scsi_change_queue_depth(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->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 933                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 934                                 1);
 935                 /* SendMsgOut returns, so set up the return
 936                  * address */
 937                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 938
 939                 break;
 940         }
 941         NCR_700_writel(temp, host, TEMP_REG);
 942         /* set us up to receive another message */
 943         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 944         return resume_offset;
 945 }
 946
 947 STATIC __u32
 948 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 949                          struct Scsi_Host *host,
 950                          struct NCR_700_Host_Parameters *hostdata)
 951 {
 952         __u32 resume_offset = 0;
 953         __u8 pun = 0xff, lun=0xff;
 954
 955         if(SCp != NULL) {
 956                 pun = SCp->device->id;
 957                 lun = SCp->device->lun;
 958         }
 959
 960         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 961                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 962                        hostdata->status[0]));
 963                 /* OK, if TCQ still under negotiation, we now know it works */
 964                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 965                         NCR_700_set_tag_neg_state(SCp->device,
 966                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 967
 968                 /* check for contingent allegiance contitions */
 969                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 970                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 971                         struct NCR_700_command_slot *slot =
 972                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 973                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
 974                                 /* OOPS: bad device, returning another
 975                                  * contingent allegiance condition */
 976                                 scmd_printk(KERN_ERR, SCp,
 977                                         "broken device is looping in contingent allegiance: ignoring\n");
 978                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 979                         } else {
 980                                 char *cmnd =
 981                                         NCR_700_get_sense_cmnd(SCp->device);
 982 #ifdef NCR_DEBUG
 983                                 scsi_print_command(SCp);
 984                                 printk("  cmd %p has status %d, requesting sense\n",
 985                                        SCp, hostdata->status[0]);
 986 #endif
 987                                 /* we can destroy the command here
 988                                  * because the contingent allegiance
 989                                  * condition will cause a retry which
 990                                  * will re-copy the command from the
 991                                  * saved data_cmnd.  We also unmap any
 992                                  * data associated with the command
 993                                  * here */
 994                                 NCR_700_unmap(hostdata, SCp, slot);
 995                                 dma_unmap_single(hostdata->dev, slot->pCmd,
 996                                                  MAX_COMMAND_SIZE,
 997                                                  DMA_TO_DEVICE);
 998
 999                                 cmnd[0] = REQUEST_SENSE;
1000                                 cmnd[1] = (lun & 0x7) << 5;
1001                                 cmnd[2] = 0;
1002                                 cmnd[3] = 0;
1003                                 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1004                                 cmnd[5] = 0;
1005                                 /* Here's a quiet hack: the
1006                                  * REQUEST_SENSE command is six bytes,
1007                                  * so store a flag indicating that
1008                                  * this was an internal sense request
1009                                  * and the original status at the end
1010                                  * of the command */
1011                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1012                                 cmnd[7] = hostdata->status[0];
1013                                 cmnd[8] = SCp->cmd_len;
1014                                 SCp->cmd_len = 6; /* command length for
1015                                                    * REQUEST_SENSE */
1016                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1017                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1018                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1019                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1020                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1021                                 slot->SG[1].pAddr = 0;
1022                                 slot->resume_offset = hostdata->pScript;
1023                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1024                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1025
1026                                 /* queue the command for reissue */
1027                                 slot->state = NCR_700_SLOT_QUEUED;
1028                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1029                                 hostdata->state = NCR_700_HOST_FREE;
1030                                 hostdata->cmd = NULL;
1031                         }
1032                 } else {
1033                         // Currently rely on the mid layer evaluation
1034                         // of the tag queuing capability
1035                         //
1036                         //if(status_byte(hostdata->status[0]) == GOOD &&
1037                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1038                         //      /* Piggy back the tag queueing support
1039                         //       * on this command */
1040                         //      dma_sync_single_for_cpu(hostdata->dev,
1041                         //                          slot->dma_handle,
1042                         //                          SCp->request_bufflen,
1043                         //                          DMA_FROM_DEVICE);
1044                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1045                         //              scmd_printk(KERN_INFO, SCp,
1046                         //                   "Enabling Tag Command Queuing\n");
1047                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1048                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1049                         //      } else {
1050                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1051                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1052                         //      }
1053                         //}
1054                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1055                 }
1056         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1057                 __u8 i = (dsps & 0xf00) >> 8;
1058
1059                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1060                        NCR_700_phase[i],
1061                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1062                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1063                         SCp->cmd_len);
1064                 scsi_print_command(SCp);
1065
1066                 NCR_700_internal_bus_reset(host);
1067         } else if((dsps & 0xfffff000) == A_FATAL) {
1068                 int i = (dsps & 0xfff);
1069
1070                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1071                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1072                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1073                         printk(KERN_ERR "     msg begins %02x %02x\n",
1074                                hostdata->msgin[0], hostdata->msgin[1]);
1075                 }
1076                 NCR_700_internal_bus_reset(host);
1077         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1078 #ifdef NCR_700_DEBUG
1079                 __u8 i = (dsps & 0xf00) >> 8;
1080
1081                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1082                        host->host_no, pun, lun,
1083                        i, NCR_700_phase[i]);
1084 #endif
1085                 save_for_reselection(hostdata, SCp, dsp);
1086
1087         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1088                 __u8 lun;
1089                 struct NCR_700_command_slot *slot;
1090                 __u8 reselection_id = hostdata->reselection_id;
1091                 struct scsi_device *SDp;
1092
1093                 lun = hostdata->msgin[0] & 0x1f;
1094
1095                 hostdata->reselection_id = 0xff;
1096                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1097                        host->host_no, reselection_id, lun));
1098                 /* clear the reselection indicator */
1099                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1100                 if(unlikely(SDp == NULL)) {
1101                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1102                                host->host_no, reselection_id, lun);
1103                         BUG();
1104                 }
1105                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1106                         struct scsi_cmnd *SCp;
1107
1108                         SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);
1109                         if(unlikely(SCp == NULL)) {
1110                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1111                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1112                                 BUG();
1113                         }
1114
1115                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1116                         DDEBUG(KERN_DEBUG, SDp,
1117                                 "reselection is tag %d, slot %p(%d)\n",
1118                                 hostdata->msgin[2], slot, slot->tag);
1119                 } else {
1120                         struct NCR_700_Device_Parameters *p = SDp->hostdata;
1121                         struct scsi_cmnd *SCp = p->current_cmnd;
1122
1123                         if(unlikely(SCp == NULL)) {
1124                                 sdev_printk(KERN_ERR, SDp,
1125                                         "no saved request for untagged cmd\n");
1126                                 BUG();
1127                         }
1128                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1129                 }
1130
1131                 if(slot == NULL) {
1132                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1133                                host->host_no, reselection_id, lun,
1134                                hostdata->msgin[0], hostdata->msgin[1],
1135                                hostdata->msgin[2]);
1136                 } else {
1137                         if(hostdata->state != NCR_700_HOST_BUSY)
1138                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1139                                        host->host_no);
1140                         resume_offset = slot->resume_offset;
1141                         hostdata->cmd = slot->cmnd;
1142
1143                         /* re-patch for this command */
1144                         script_patch_32_abs(hostdata->dev, hostdata->script,
1145                                             CommandAddress, slot->pCmd);
1146                         script_patch_16(hostdata->dev, hostdata->script,
1147                                         CommandCount, slot->cmnd->cmd_len);
1148                         script_patch_32_abs(hostdata->dev, hostdata->script,
1149                                             SGScriptStartAddress,
1150                                             to32bit(&slot->pSG[0].ins));
1151
1152                         /* Note: setting SXFER only works if we're
1153                          * still in the MESSAGE phase, so it is vital
1154                          * that ACK is still asserted when we process
1155                          * the reselection message.  The resume offset
1156                          * should therefore always clear ACK */
1157                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1158                                        host, SXFER_REG);
1159                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1160                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1161                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1162                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1163                         /* I'm just being paranoid here, the command should
1164                          * already have been flushed from the cache */
1165                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1166                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1167
1168
1169
1170                 }
1171         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1172
1173                 /* This section is full of debugging code because I've
1174                  * never managed to reach it.  I think what happens is
1175                  * that, because the 700 runs with selection
1176                  * interrupts enabled the whole time that we take a
1177                  * selection interrupt before we manage to get to the
1178                  * reselected script interrupt */
1179
1180                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1181                 struct NCR_700_command_slot *slot;
1182
1183                 /* Take out our own ID */
1184                 reselection_id &= ~(1<<host->this_id);
1185
1186                 /* I've never seen this happen, so keep this as a printk rather
1187                  * than a debug */
1188                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1189                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1190
1191                 {
1192                         /* FIXME: DEBUGGING CODE */
1193                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1194                         int i;
1195
1196                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1197                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1198                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1199                                         break;
1200                         }
1201                         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);
1202                         SCp =  hostdata->slots[i].cmnd;
1203                 }
1204
1205                 if(SCp != NULL) {
1206                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1207                         /* change slot from busy to queued to redo command */
1208                         slot->state = NCR_700_SLOT_QUEUED;
1209                 }
1210                 hostdata->cmd = NULL;
1211
1212                 if(reselection_id == 0) {
1213                         if(hostdata->reselection_id == 0xff) {
1214                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1215                                 return 0;
1216                         } else {
1217                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1218                                        host->host_no);
1219                                 reselection_id = hostdata->reselection_id;
1220                         }
1221                 } else {
1222
1223                         /* convert to real ID */
1224                         reselection_id = bitmap_to_number(reselection_id);
1225                 }
1226                 hostdata->reselection_id = reselection_id;
1227                 /* just in case we have a stale simple tag message, clear it */
1228                 hostdata->msgin[1] = 0;
1229                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1230                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1231                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1232                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1233                 } else {
1234                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1235                 }
1236         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1237                 /* we've just disconnected from the bus, do nothing since
1238                  * a return here will re-run the queued command slot
1239                  * that may have been interrupted by the initial selection */
1240                 DEBUG((" SELECTION COMPLETED\n"));
1241         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1242                 resume_offset = process_message(host, hostdata, SCp,
1243                                                 dsp, dsps);
1244         } else if((dsps &  0xfffff000) == 0) {
1245                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1246                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1247                        host->host_no, pun, lun, NCR_700_condition[i],
1248                        NCR_700_phase[j], dsp - hostdata->pScript);
1249                 if(SCp != NULL) {
1250                         struct scatterlist *sg;
1251
1252                         scsi_print_command(SCp);
1253                         scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1254                                 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1255                         }
1256                 }
1257                 NCR_700_internal_bus_reset(host);
1258         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1259                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1260                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1261                 resume_offset = dsp;
1262         } else {
1263                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1264                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1265                 NCR_700_internal_bus_reset(host);
1266         }
1267         return resume_offset;
1268 }
1269
1270 /* We run the 53c700 with selection interrupts always enabled.  This
1271  * means that the chip may be selected as soon as the bus frees.  On a
1272  * busy bus, this can be before the scripts engine finishes its
1273  * processing.  Therefore, part of the selection processing has to be
1274  * to find out what the scripts engine is doing and complete the
1275  * function if necessary (i.e. process the pending disconnect or save
1276  * the interrupted initial selection */
1277 STATIC inline __u32
1278 process_selection(struct Scsi_Host *host, __u32 dsp)
1279 {
1280         __u8 id = 0;    /* Squash compiler warning */
1281         int count = 0;
1282         __u32 resume_offset = 0;
1283         struct NCR_700_Host_Parameters *hostdata =
1284                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1285         struct scsi_cmnd *SCp = hostdata->cmd;
1286         __u8 sbcl;
1287
1288         for(count = 0; count < 5; count++) {
1289                 id = NCR_700_readb(host, hostdata->chip710 ?
1290                                    CTEST9_REG : SFBR_REG);
1291
1292                 /* Take out our own ID */
1293                 id &= ~(1<<host->this_id);
1294                 if(id != 0)
1295                         break;
1296                 udelay(5);
1297         }
1298         sbcl = NCR_700_readb(host, SBCL_REG);
1299         if((sbcl & SBCL_IO) == 0) {
1300                 /* mark as having been selected rather than reselected */
1301                 id = 0xff;
1302         } else {
1303                 /* convert to real ID */
1304                 hostdata->reselection_id = id = bitmap_to_number(id);
1305                 DEBUG(("scsi%d:  Reselected by %d\n",
1306                        host->host_no, id));
1307         }
1308         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1309                 struct NCR_700_command_slot *slot =
1310                         (struct NCR_700_command_slot *)SCp->host_scribble;
1311                 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));
1312
1313                 switch(dsp - hostdata->pScript) {
1314                 case Ent_Disconnect1:
1315                 case Ent_Disconnect2:
1316                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1317                         break;
1318                 case Ent_Disconnect3:
1319                 case Ent_Disconnect4:
1320                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1321                         break;
1322                 case Ent_Disconnect5:
1323                 case Ent_Disconnect6:
1324                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1325                         break;
1326                 case Ent_Disconnect7:
1327                 case Ent_Disconnect8:
1328                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1329                         break;
1330                 case Ent_Finish1:
1331                 case Ent_Finish2:
1332                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1333                         break;
1334
1335                 default:
1336                         slot->state = NCR_700_SLOT_QUEUED;
1337                         break;
1338                         }
1339         }
1340         hostdata->state = NCR_700_HOST_BUSY;
1341         hostdata->cmd = NULL;
1342         /* clear any stale simple tag message */
1343         hostdata->msgin[1] = 0;
1344         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1345                        DMA_BIDIRECTIONAL);
1346
1347         if(id == 0xff) {
1348                 /* Selected as target, Ignore */
1349                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1350         } else if(hostdata->tag_negotiated & (1<<id)) {
1351                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1352         } else {
1353                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1354         }
1355         return resume_offset;
1356 }
1357
1358 static inline void
1359 NCR_700_clear_fifo(struct Scsi_Host *host) {
1360         const struct NCR_700_Host_Parameters *hostdata
1361                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1362         if(hostdata->chip710) {
1363                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1364         } else {
1365                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1366         }
1367 }
1368
1369 static inline void
1370 NCR_700_flush_fifo(struct Scsi_Host *host) {
1371         const struct NCR_700_Host_Parameters *hostdata
1372                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1373         if(hostdata->chip710) {
1374                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1375                 udelay(10);
1376                 NCR_700_writeb(0, host, CTEST8_REG);
1377         } else {
1378                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1379                 udelay(10);
1380                 NCR_700_writeb(0, host, DFIFO_REG);
1381         }
1382 }
1383
1384
1385 /* The queue lock with interrupts disabled must be held on entry to
1386  * this function */
1387 STATIC int
1388 NCR_700_start_command(struct scsi_cmnd *SCp)
1389 {
1390         struct NCR_700_command_slot *slot =
1391                 (struct NCR_700_command_slot *)SCp->host_scribble;
1392         struct NCR_700_Host_Parameters *hostdata =
1393                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1394         __u16 count = 1;        /* for IDENTIFY message */
1395         u8 lun = SCp->device->lun;
1396
1397         if(hostdata->state != NCR_700_HOST_FREE) {
1398                 /* keep this inside the lock to close the race window where
1399                  * the running command finishes on another CPU while we don't
1400                  * change the state to queued on this one */
1401                 slot->state = NCR_700_SLOT_QUEUED;
1402
1403                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1404                        SCp->device->host->host_no, slot->cmnd, slot));
1405                 return 0;
1406         }
1407         hostdata->state = NCR_700_HOST_BUSY;
1408         hostdata->cmd = SCp;
1409         slot->state = NCR_700_SLOT_BUSY;
1410         /* keep interrupts disabled until we have the command correctly
1411          * set up so we cannot take a selection interrupt */
1412
1413         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1414                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1415                                                lun);
1416         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1417          * if the negotiated transfer parameters still hold, so
1418          * always renegotiate them */
1419         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1420            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1421                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1422         }
1423
1424         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1425          * If a contingent allegiance condition exists, the device
1426          * will refuse all tags, so send the request sense as untagged
1427          * */
1428         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1429            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1430                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1431                 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1432         }
1433
1434         if(hostdata->fast &&
1435            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1436                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1437                                 spi_period(SCp->device->sdev_target),
1438                                 spi_offset(SCp->device->sdev_target));
1439                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1440         }
1441
1442         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1443
1444
1445         script_patch_ID(hostdata->dev, hostdata->script,
1446                         Device_ID, 1<<scmd_id(SCp));
1447
1448         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1449                             slot->pCmd);
1450         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1451                         SCp->cmd_len);
1452         /* finally plumb the beginning of the SG list into the script
1453          * */
1454         script_patch_32_abs(hostdata->dev, hostdata->script,
1455                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1456         NCR_700_clear_fifo(SCp->device->host);
1457
1458         if(slot->resume_offset == 0)
1459                 slot->resume_offset = hostdata->pScript;
1460         /* now perform all the writebacks and invalidates */
1461         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1462         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1463                        DMA_FROM_DEVICE);
1464         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1465         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1466
1467         /* set the synchronous period/offset */
1468         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1469                        SCp->device->host, SXFER_REG);
1470         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1471         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1472
1473         return 1;
1474 }
1475
1476 irqreturn_t
1477 NCR_700_intr(int irq, void *dev_id)
1478 {
1479         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1480         struct NCR_700_Host_Parameters *hostdata =
1481                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1482         __u8 istat;
1483         __u32 resume_offset = 0;
1484         __u8 pun = 0xff, lun = 0xff;
1485         unsigned long flags;
1486         int handled = 0;
1487
1488         /* Use the host lock to serialise access to the 53c700
1489          * hardware.  Note: In future, we may need to take the queue
1490          * lock to enter the done routines.  When that happens, we
1491          * need to ensure that for this driver, the host lock and the
1492          * queue lock point to the same thing. */
1493         spin_lock_irqsave(host->host_lock, flags);
1494         if((istat = NCR_700_readb(host, ISTAT_REG))
1495               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1496                 __u32 dsps;
1497                 __u8 sstat0 = 0, dstat = 0;
1498                 __u32 dsp;
1499                 struct scsi_cmnd *SCp = hostdata->cmd;
1500                 enum NCR_700_Host_State state;
1501
1502                 handled = 1;
1503                 state = hostdata->state;
1504                 SCp = hostdata->cmd;
1505
1506                 if(istat & SCSI_INT_PENDING) {
1507                         udelay(10);
1508
1509                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1510                 }
1511
1512                 if(istat & DMA_INT_PENDING) {
1513                         udelay(10);
1514
1515                         dstat = NCR_700_readb(host, DSTAT_REG);
1516                 }
1517
1518                 dsps = NCR_700_readl(host, DSPS_REG);
1519                 dsp = NCR_700_readl(host, DSP_REG);
1520
1521                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1522                        host->host_no, istat, sstat0, dstat,
1523                        (dsp - (__u32)(hostdata->pScript))/4,
1524                        dsp, dsps));
1525
1526                 if(SCp != NULL) {
1527                         pun = SCp->device->id;
1528                         lun = SCp->device->lun;
1529                 }
1530
1531                 if(sstat0 & SCSI_RESET_DETECTED) {
1532                         struct scsi_device *SDp;
1533                         int i;
1534
1535                         hostdata->state = NCR_700_HOST_BUSY;
1536
1537                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1538                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1539
1540                         scsi_report_bus_reset(host, 0);
1541
1542                         /* clear all the negotiated parameters */
1543                         __shost_for_each_device(SDp, host)
1544                                 NCR_700_clear_flag(SDp, ~0);
1545
1546                         /* clear all the slots and their pending commands */
1547                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1548                                 struct scsi_cmnd *SCp;
1549                                 struct NCR_700_command_slot *slot =
1550                                         &hostdata->slots[i];
1551
1552                                 if(slot->state == NCR_700_SLOT_FREE)
1553                                         continue;
1554
1555                                 SCp = slot->cmnd;
1556                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1557                                        slot, SCp);
1558                                 free_slot(slot, hostdata);
1559                                 SCp->host_scribble = NULL;
1560                                 NCR_700_set_depth(SCp->device, 0);
1561                                 /* NOTE: deadlock potential here: we
1562                                  * rely on mid-layer guarantees that
1563                                  * scsi_done won't try to issue the
1564                                  * command again otherwise we'll
1565                                  * deadlock on the
1566                                  * hostdata->state_lock */
1567                                 SCp->result = DID_RESET << 16;
1568                                 SCp->scsi_done(SCp);
1569                         }
1570                         mdelay(25);
1571                         NCR_700_chip_setup(host);
1572
1573                         hostdata->state = NCR_700_HOST_FREE;
1574                         hostdata->cmd = NULL;
1575                         /* signal back if this was an eh induced reset */
1576                         if(hostdata->eh_complete != NULL)
1577                                 complete(hostdata->eh_complete);
1578                         goto out_unlock;
1579                 } else if(sstat0 & SELECTION_TIMEOUT) {
1580                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1581                                host->host_no, pun, lun));
1582                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1583                 } else if(sstat0 & PHASE_MISMATCH) {
1584                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1585                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1586
1587                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1588                                 /* It wants to reply to some part of
1589                                  * our message */
1590 #ifdef NCR_700_DEBUG
1591                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1592                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1593                                 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)));
1594 #endif
1595                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1596                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1597                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1598                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1599                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1600                                 int residual = NCR_700_data_residual(host);
1601                                 int i;
1602 #ifdef NCR_700_DEBUG
1603                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1604
1605                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1606                                        host->host_no, pun, lun,
1607                                        SGcount, data_transfer);
1608                                 scsi_print_command(SCp);
1609                                 if(residual) {
1610                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1611                                        host->host_no, pun, lun,
1612                                        SGcount, data_transfer, residual);
1613                                 }
1614 #endif
1615                                 data_transfer += residual;
1616
1617                                 if(data_transfer != 0) {
1618                                         int count;
1619                                         __u32 pAddr;
1620
1621                                         SGcount--;
1622
1623                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1624                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1625                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1626                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1627                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1628                                         pAddr += (count - data_transfer);
1629 #ifdef NCR_700_DEBUG
1630                                         if(pAddr != naddr) {
1631                                                 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);
1632                                         }
1633 #endif
1634                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1635                                 }
1636                                 /* set the executed moves to nops */
1637                                 for(i=0; i<SGcount; i++) {
1638                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1639                                         slot->SG[i].pAddr = 0;
1640                                 }
1641                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1642                                 /* and pretend we disconnected after
1643                                  * the command phase */
1644                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1645                                 /* make sure all the data is flushed */
1646                                 NCR_700_flush_fifo(host);
1647                         } else {
1648                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1649                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1650                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1651                                 NCR_700_internal_bus_reset(host);
1652                         }
1653
1654                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1655                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1656                                host->host_no, pun, lun);
1657                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1658                 } else if(sstat0 & PARITY_ERROR) {
1659                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1660                                host->host_no, pun, lun);
1661                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1663                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1664                                host->host_no, pun, lun));
1665                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1666                 } else if(dstat & (ILGL_INST_DETECTED)) {
1667                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1668                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1669                                host->host_no, pun, lun,
1670                                dsp, dsp - hostdata->pScript);
1671                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1672                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1673                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1674                                host->host_no, pun, lun, dstat);
1675                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1676                 }
1677
1678
1679                 /* NOTE: selection interrupt processing MUST occur
1680                  * after script interrupt processing to correctly cope
1681                  * with the case where we process a disconnect and
1682                  * then get reselected before we process the
1683                  * disconnection */
1684                 if(sstat0 & SELECTED) {
1685                         /* FIXME: It currently takes at least FOUR
1686                          * interrupts to complete a command that
1687                          * disconnects: one for the disconnect, one
1688                          * for the reselection, one to get the
1689                          * reselection data and one to complete the
1690                          * command.  If we guess the reselected
1691                          * command here and prepare it, we only need
1692                          * to get a reselection data interrupt if we
1693                          * guessed wrongly.  Since the interrupt
1694                          * overhead is much greater than the command
1695                          * setup, this would be an efficient
1696                          * optimisation particularly as we probably
1697                          * only have one outstanding command on a
1698                          * target most of the time */
1699
1700                         resume_offset = process_selection(host, dsp);
1701
1702                 }
1703
1704         }
1705
1706         if(resume_offset) {
1707                 if(hostdata->state != NCR_700_HOST_BUSY) {
1708                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1709                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1710                         hostdata->state = NCR_700_HOST_BUSY;
1711                 }
1712
1713                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1714                 NCR_700_clear_fifo(host);
1715                 NCR_700_writel(resume_offset, host, DSP_REG);
1716         }
1717         /* There is probably a technical no-no about this: If we're a
1718          * shared interrupt and we got this interrupt because the
1719          * other device needs servicing not us, we're still going to
1720          * check our queued commands here---of course, there shouldn't
1721          * be any outstanding.... */
1722         if(hostdata->state == NCR_700_HOST_FREE) {
1723                 int i;
1724
1725                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1726                         /* fairness: always run the queue from the last
1727                          * position we left off */
1728                         int j = (i + hostdata->saved_slot_position)
1729                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1730
1731                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1732                                 continue;
1733                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1734                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1735                                        host->host_no, &hostdata->slots[j],
1736                                        hostdata->slots[j].cmnd));
1737                                 hostdata->saved_slot_position = j + 1;
1738                         }
1739
1740                         break;
1741                 }
1742         }
1743  out_unlock:
1744         spin_unlock_irqrestore(host->host_lock, flags);
1745         return IRQ_RETVAL(handled);
1746 }
1747
1748 static int
1749 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1750 {
1751         struct NCR_700_Host_Parameters *hostdata =
1752                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1753         __u32 move_ins;
1754         enum dma_data_direction direction;
1755         struct NCR_700_command_slot *slot;
1756
1757         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1758                 /* We're over our allocation, this should never happen
1759                  * since we report the max allocation to the mid layer */
1760                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1761                 return 1;
1762         }
1763         /* check for untagged commands.  We cannot have any outstanding
1764          * commands if we accept them.  Commands could be untagged because:
1765          *
1766          * - The tag negotiated bitmap is clear
1767          * - The blk layer sent and untagged command
1768          */
1769         if(NCR_700_get_depth(SCp->device) != 0
1770            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1771                || !(SCp->flags & SCMD_TAGGED))) {
1772                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1773                        NCR_700_get_depth(SCp->device));
1774                 return SCSI_MLQUEUE_DEVICE_BUSY;
1775         }
1776         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1777                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1778                        NCR_700_get_depth(SCp->device));
1779                 return SCSI_MLQUEUE_DEVICE_BUSY;
1780         }
1781         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1782
1783         /* begin the command here */
1784         /* no need to check for NULL, test for command_slot_count above
1785          * ensures a slot is free */
1786         slot = find_empty_slot(hostdata);
1787
1788         slot->cmnd = SCp;
1789
1790         SCp->scsi_done = done;
1791         SCp->host_scribble = (unsigned char *)slot;
1792         SCp->SCp.ptr = NULL;
1793         SCp->SCp.buffer = NULL;
1794
1795 #ifdef NCR_700_DEBUG
1796         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1797         scsi_print_command(SCp);
1798 #endif
1799         if ((SCp->flags & SCMD_TAGGED)
1800            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1801            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1802                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1803                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1804                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1805         }
1806
1807         /* here we may have to process an untagged command.  The gate
1808          * above ensures that this will be the only one outstanding,
1809          * so clear the tag negotiated bit.
1810          *
1811          * FIXME: This will royally screw up on multiple LUN devices
1812          * */
1813         if (!(SCp->flags & SCMD_TAGGED)
1814            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1815                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1816                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1817         }
1818
1819         if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&
1820             SCp->device->simple_tags) {
1821                 slot->tag = SCp->request->tag;
1822                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1823                        slot->tag, slot);
1824         } else {
1825                 struct NCR_700_Device_Parameters *p = SCp->device->hostdata;
1826
1827                 slot->tag = SCSI_NO_TAG;
1828                 /* save current command for reselection */
1829                 p->current_cmnd = SCp;
1830         }
1831         /* sanity check: some of the commands generated by the mid-layer
1832          * have an eccentric idea of their sc_data_direction */
1833         if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1834            SCp->sc_data_direction != DMA_NONE) {
1835 #ifdef NCR_700_DEBUG
1836                 printk("53c700: Command");
1837                 scsi_print_command(SCp);
1838                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1839 #endif
1840                 SCp->sc_data_direction = DMA_NONE;
1841         }
1842
1843         switch (SCp->cmnd[0]) {
1844         case REQUEST_SENSE:
1845                 /* clear the internal sense magic */
1846                 SCp->cmnd[6] = 0;
1847                 /* fall through */
1848         default:
1849                 /* OK, get it from the command */
1850                 switch(SCp->sc_data_direction) {
1851                 case DMA_BIDIRECTIONAL:
1852                 default:
1853                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1854                         scsi_print_command(SCp);
1855
1856                         move_ins = 0;
1857                         break;
1858                 case DMA_NONE:
1859                         move_ins = 0;
1860                         break;
1861                 case DMA_FROM_DEVICE:
1862                         move_ins = SCRIPT_MOVE_DATA_IN;
1863                         break;
1864                 case DMA_TO_DEVICE:
1865                         move_ins = SCRIPT_MOVE_DATA_OUT;
1866                         break;
1867                 }
1868         }
1869
1870         /* now build the scatter gather list */
1871         direction = SCp->sc_data_direction;
1872         if(move_ins != 0) {
1873                 int i;
1874                 int sg_count;
1875                 dma_addr_t vPtr = 0;
1876                 struct scatterlist *sg;
1877                 __u32 count = 0;
1878
1879                 sg_count = scsi_dma_map(SCp);
1880                 BUG_ON(sg_count < 0);
1881
1882                 scsi_for_each_sg(SCp, sg, sg_count, i) {
1883                         vPtr = sg_dma_address(sg);
1884                         count = sg_dma_len(sg);
1885
1886                         slot->SG[i].ins = bS_to_host(move_ins | count);
1887                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1888                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1889                         slot->SG[i].pAddr = bS_to_host(vPtr);
1890                 }
1891                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1892                 slot->SG[i].pAddr = 0;
1893                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1894                 DEBUG((" SETTING %p to %x\n",
1895                        (&slot->pSG[i].ins),
1896                        slot->SG[i].ins));
1897         }
1898         slot->resume_offset = 0;
1899         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1900                                     MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1901         NCR_700_start_command(SCp);
1902         return 0;
1903 }
1904
1905 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1906
1907 STATIC int
1908 NCR_700_abort(struct scsi_cmnd * SCp)
1909 {
1910         struct NCR_700_command_slot *slot;
1911
1912         scmd_printk(KERN_INFO, SCp, "abort command\n");
1913
1914         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1915
1916         if(slot == NULL)
1917                 /* no outstanding command to abort */
1918                 return SUCCESS;
1919         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1920                 /* FIXME: This is because of a problem in the new
1921                  * error handler.  When it is in error recovery, it
1922                  * will send a TUR to a device it thinks may still be
1923                  * showing a problem.  If the TUR isn't responded to,
1924                  * it will abort it and mark the device off line.
1925                  * Unfortunately, it does no other error recovery, so
1926                  * this would leave us with an outstanding command
1927                  * occupying a slot.  Rather than allow this to
1928                  * happen, we issue a bus reset to force all
1929                  * outstanding commands to terminate here. */
1930                 NCR_700_internal_bus_reset(SCp->device->host);
1931                 /* still drop through and return failed */
1932         }
1933         return FAILED;
1934
1935 }
1936
1937 STATIC int
1938 NCR_700_host_reset(struct scsi_cmnd * SCp)
1939 {
1940         DECLARE_COMPLETION_ONSTACK(complete);
1941         struct NCR_700_Host_Parameters *hostdata =
1942                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1943
1944         scmd_printk(KERN_INFO, SCp,
1945                 "New error handler wants HOST reset, cmd %p\n\t", SCp);
1946         scsi_print_command(SCp);
1947
1948         /* In theory, eh_complete should always be null because the
1949          * eh is single threaded, but just in case we're handling a
1950          * reset via sg or something */
1951         spin_lock_irq(SCp->device->host->host_lock);
1952         while (hostdata->eh_complete != NULL) {
1953                 spin_unlock_irq(SCp->device->host->host_lock);
1954                 msleep_interruptible(100);
1955                 spin_lock_irq(SCp->device->host->host_lock);
1956         }
1957
1958         hostdata->eh_complete = &complete;
1959         NCR_700_internal_bus_reset(SCp->device->host);
1960         NCR_700_chip_reset(SCp->device->host);
1961
1962         spin_unlock_irq(SCp->device->host->host_lock);
1963         wait_for_completion(&complete);
1964         spin_lock_irq(SCp->device->host->host_lock);
1965
1966         hostdata->eh_complete = NULL;
1967         /* Revalidate the transport parameters of the failing device */
1968         if(hostdata->fast)
1969                 spi_schedule_dv_device(SCp->device);
1970
1971         spin_unlock_irq(SCp->device->host->host_lock);
1972         return SUCCESS;
1973 }
1974
1975 STATIC void
1976 NCR_700_set_period(struct scsi_target *STp, int period)
1977 {
1978         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1979         struct NCR_700_Host_Parameters *hostdata =
1980                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1981
1982         if(!hostdata->fast)
1983                 return;
1984
1985         if(period < hostdata->min_period)
1986                 period = hostdata->min_period;
1987
1988         spi_period(STp) = period;
1989         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
1990                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1991         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
1992 }
1993
1994 STATIC void
1995 NCR_700_set_offset(struct scsi_target *STp, int offset)
1996 {
1997         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1998         struct NCR_700_Host_Parameters *hostdata =
1999                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2000         int max_offset = hostdata->chip710
2001                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2002
2003         if(!hostdata->fast)
2004                 return;
2005
2006         if(offset > max_offset)
2007                 offset = max_offset;
2008
2009         /* if we're currently async, make sure the period is reasonable */
2010         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2011                                     spi_period(STp) > 0xff))
2012                 spi_period(STp) = hostdata->min_period;
2013
2014         spi_offset(STp) = offset;
2015         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2016                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2017         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2018 }
2019
2020 STATIC int
2021 NCR_700_slave_alloc(struct scsi_device *SDp)
2022 {
2023         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2024                                 GFP_KERNEL);
2025
2026         if (!SDp->hostdata)
2027                 return -ENOMEM;
2028
2029         return 0;
2030 }
2031
2032 STATIC int
2033 NCR_700_slave_configure(struct scsi_device *SDp)
2034 {
2035         struct NCR_700_Host_Parameters *hostdata =
2036                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2037
2038         /* to do here: allocate memory; build a queue_full list */
2039         if(SDp->tagged_supported) {
2040                 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2041                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2042         }
2043
2044         if(hostdata->fast) {
2045                 /* Find the correct offset and period via domain validation */
2046                 if (!spi_initial_dv(SDp->sdev_target))
2047                         spi_dv_device(SDp);
2048         } else {
2049                 spi_offset(SDp->sdev_target) = 0;
2050                 spi_period(SDp->sdev_target) = 0;
2051         }
2052         return 0;
2053 }
2054
2055 STATIC void
2056 NCR_700_slave_destroy(struct scsi_device *SDp)
2057 {
2058         kfree(SDp->hostdata);
2059         SDp->hostdata = NULL;
2060 }
2061
2062 static int
2063 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2064 {
2065         if (depth > NCR_700_MAX_TAGS)
2066                 depth = NCR_700_MAX_TAGS;
2067         return scsi_change_queue_depth(SDp, depth);
2068 }
2069
2070 static ssize_t
2071 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2072 {
2073         struct scsi_device *SDp = to_scsi_device(dev);
2074
2075         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2076 }
2077
2078 static struct device_attribute NCR_700_active_tags_attr = {
2079         .attr = {
2080                 .name =         "active_tags",
2081                 .mode =         S_IRUGO,
2082         },
2083         .show = NCR_700_show_active_tags,
2084 };
2085
2086 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2087         &NCR_700_active_tags_attr,
2088         NULL,
2089 };
2090
2091 EXPORT_SYMBOL(NCR_700_detect);
2092 EXPORT_SYMBOL(NCR_700_release);
2093 EXPORT_SYMBOL(NCR_700_intr);
2094
2095 static struct spi_function_template NCR_700_transport_functions =  {
2096         .set_period     = NCR_700_set_period,
2097         .show_period    = 1,
2098         .set_offset     = NCR_700_set_offset,
2099         .show_offset    = 1,
2100 };
2101
2102 static int __init NCR_700_init(void)
2103 {
2104         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2105         if(!NCR_700_transport_template)
2106                 return -ENODEV;
2107         return 0;
2108 }
2109
2110 static void __exit NCR_700_exit(void)
2111 {
2112         spi_release_transport(NCR_700_transport_template);
2113 }
2114
2115 module_init(NCR_700_init);
2116 module_exit(NCR_700_exit);
2117