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_bus_reset(struct scsi_cmnd * SCpnt);
 172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
 173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
 174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
 175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
 176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
 177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
 178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
 179
 180 STATIC struct device_attribute *NCR_700_dev_attrs[];
 181
 182 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 183
 184 static char *NCR_700_phase[] = {
 185         "",
 186         "after selection",
 187         "before command phase",
 188         "after command phase",
 189         "after status phase",
 190         "after data in phase",
 191         "after data out phase",
 192         "during data phase",
 193 };
 194
 195 static char *NCR_700_condition[] = {
 196         "",
 197         "NOT MSG_OUT",
 198         "UNEXPECTED PHASE",
 199         "NOT MSG_IN",
 200         "UNEXPECTED MSG",
 201         "MSG_IN",
 202         "SDTR_MSG RECEIVED",
 203         "REJECT_MSG RECEIVED",
 204         "DISCONNECT_MSG RECEIVED",
 205         "MSG_OUT",
 206         "DATA_IN",
 207
 208 };
 209
 210 static char *NCR_700_fatal_messages[] = {
 211         "unexpected message after reselection",
 212         "still MSG_OUT after message injection",
 213         "not MSG_IN after selection",
 214         "Illegal message length received",
 215 };
 216
 217 static char *NCR_700_SBCL_bits[] = {
 218         "IO ",
 219         "CD ",
 220         "MSG ",
 221         "ATN ",
 222         "SEL ",
 223         "BSY ",
 224         "ACK ",
 225         "REQ ",
 226 };
 227
 228 static char *NCR_700_SBCL_to_phase[] = {
 229         "DATA_OUT",
 230         "DATA_IN",
 231         "CMD_OUT",
 232         "STATE",
 233         "ILLEGAL PHASE",
 234         "ILLEGAL PHASE",
 235         "MSG OUT",
 236         "MSG IN",
 237 };
 238
 239 /* This translates the SDTR message offset and period to a value
 240  * which can be loaded into the SXFER_REG.
 241  *
 242  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 243  *       actually four times this period value */
 244 static inline __u8
 245 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 246                                __u8 offset, __u8 period)
 247 {
 248         int XFERP;
 249
 250         __u8 min_xferp = (hostdata->chip710
 251                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 252         __u8 max_offset = (hostdata->chip710
 253                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 254
 255         if(offset == 0)
 256                 return 0;
 257
 258         if(period < hostdata->min_period) {
 259                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 260                 period = hostdata->min_period;
 261         }
 262         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 263         if(offset > max_offset) {
 264                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 265                        offset, max_offset);
 266                 offset = max_offset;
 267         }
 268         if(XFERP < min_xferp) {
 269                 XFERP =  min_xferp;
 270         }
 271         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 272 }
 273
 274 static inline __u8
 275 NCR_700_get_SXFER(struct scsi_device *SDp)
 276 {
 277         struct NCR_700_Host_Parameters *hostdata =
 278                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 279
 280         return NCR_700_offset_period_to_sxfer(hostdata,
 281                                               spi_offset(SDp->sdev_target),
 282                                               spi_period(SDp->sdev_target));
 283 }
 284
 285 struct Scsi_Host *
 286 NCR_700_detect(struct scsi_host_template *tpnt,
 287                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 288 {
 289         dma_addr_t pScript, pSlots;
 290         __u8 *memory;
 291         __u32 *script;
 292         struct Scsi_Host *host;
 293         static int banner = 0;
 294         int j;
 295
 296         if(tpnt->sdev_attrs == NULL)
 297                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 298
 299         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 300                                        &pScript, GFP_KERNEL);
 301         if(memory == NULL) {
 302                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
 303                 return NULL;
 304         }
 305
 306         script = (__u32 *)memory;
 307         hostdata->msgin = memory + MSGIN_OFFSET;
 308         hostdata->msgout = memory + MSGOUT_OFFSET;
 309         hostdata->status = memory + STATUS_OFFSET;
 310         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 311         hostdata->dev = dev;
 312
 313         pSlots = pScript + SLOTS_OFFSET;
 314
 315         /* Fill in the missing routines from the host template */
 316         tpnt->queuecommand = NCR_700_queuecommand;
 317         tpnt->eh_abort_handler = NCR_700_abort;
 318         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
 319         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 320         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 321         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 322         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 323         tpnt->use_clustering = ENABLE_CLUSTERING;
 324         tpnt->slave_configure = NCR_700_slave_configure;
 325         tpnt->slave_destroy = NCR_700_slave_destroy;
 326         tpnt->slave_alloc = NCR_700_slave_alloc;
 327         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 328
 329         if(tpnt->name == NULL)
 330                 tpnt->name = "53c700";
 331         if(tpnt->proc_name == NULL)
 332                 tpnt->proc_name = "53c700";
 333
 334         host = scsi_host_alloc(tpnt, 4);
 335         if (!host)
 336                 return NULL;
 337         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 338                * NCR_700_COMMAND_SLOTS_PER_HOST);
 339         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 340                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 341                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 342                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 343                 if(j == 0)
 344                         hostdata->free_list = &hostdata->slots[j];
 345                 else
 346                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 347                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 348         }
 349
 350         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 351                 script[j] = bS_to_host(SCRIPT[j]);
 352
 353         /* adjust all labels to be bus physical */
 354         for (j = 0; j < PATCHES; j++)
 355                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 356         /* now patch up fixed addresses. */
 357         script_patch_32(hostdata->dev, script, MessageLocation,
 358                         pScript + MSGOUT_OFFSET);
 359         script_patch_32(hostdata->dev, script, StatusAddress,
 360                         pScript + STATUS_OFFSET);
 361         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
 362                         pScript + MSGIN_OFFSET);
 363
 364         hostdata->script = script;
 365         hostdata->pScript = pScript;
 366         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 367         hostdata->state = NCR_700_HOST_FREE;
 368         hostdata->cmd = NULL;
 369         host->max_id = 8;
 370         host->max_lun = NCR_700_MAX_LUNS;
 371         BUG_ON(NCR_700_transport_template == NULL);
 372         host->transportt = NCR_700_transport_template;
 373         host->unique_id = (unsigned long)hostdata->base;
 374         hostdata->eh_complete = NULL;
 375         host->hostdata[0] = (unsigned long)hostdata;
 376         /* kick the chip */
 377         NCR_700_writeb(0xff, host, CTEST9_REG);
 378         if (hostdata->chip710)
 379                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 380         else
 381                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 382         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 383         if (banner == 0) {
 384                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 385                 banner = 1;
 386         }
 387         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 388                hostdata->chip710 ? "53c710" :
 389                (hostdata->fast ? "53c700-66" : "53c700"),
 390                hostdata->rev, hostdata->differential ?
 391                "(Differential)" : "");
 392         /* reset the chip */
 393         NCR_700_chip_reset(host);
 394
 395         if (scsi_add_host(host, dev)) {
 396                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 397                 scsi_host_put(host);
 398                 return NULL;
 399         }
 400
 401         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 402                 SPI_SIGNAL_SE;
 403
 404         return host;
 405 }
 406
 407 int
 408 NCR_700_release(struct Scsi_Host *host)
 409 {
 410         struct NCR_700_Host_Parameters *hostdata =
 411                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 412
 413         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 414                                hostdata->script, hostdata->pScript);
 415         return 1;
 416 }
 417
 418 static inline __u8
 419 NCR_700_identify(int can_disconnect, __u8 lun)
 420 {
 421         return IDENTIFY_BASE |
 422                 ((can_disconnect) ? 0x40 : 0) |
 423                 (lun & NCR_700_LUN_MASK);
 424 }
 425
 426 /*
 427  * Function : static int data_residual (Scsi_Host *host)
 428  *
 429  * Purpose : return residual data count of what's in the chip.  If you
 430  * really want to know what this function is doing, it's almost a
 431  * direct transcription of the algorithm described in the 53c710
 432  * guide, except that the DBC and DFIFO registers are only 6 bits
 433  * wide on a 53c700.
 434  *
 435  * Inputs : host - SCSI host */
 436 static inline int
 437 NCR_700_data_residual (struct Scsi_Host *host) {
 438         struct NCR_700_Host_Parameters *hostdata =
 439                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 440         int count, synchronous = 0;
 441         unsigned int ddir;
 442
 443         if(hostdata->chip710) {
 444                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 445                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 446         } else {
 447                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 448                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 449         }
 450
 451         if(hostdata->fast)
 452                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 453
 454         /* get the data direction */
 455         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 456
 457         if (ddir) {
 458                 /* Receive */
 459                 if (synchronous)
 460                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 461                 else
 462                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 463                                 ++count;
 464         } else {
 465                 /* Send */
 466                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 467                 if (sstat & SODL_REG_FULL)
 468                         ++count;
 469                 if (synchronous && (sstat & SODR_REG_FULL))
 470                         ++count;
 471         }
 472 #ifdef NCR_700_DEBUG
 473         if(count)
 474                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 475 #endif
 476         return count;
 477 }
 478
 479 /* print out the SCSI wires and corresponding phase from the SBCL register
 480  * in the chip */
 481 static inline char *
 482 sbcl_to_string(__u8 sbcl)
 483 {
 484         int i;
 485         static char ret[256];
 486
 487         ret[0]='\0';
 488         for(i=0; i<8; i++) {
 489                 if((1<<i) & sbcl)
 490                         strcat(ret, NCR_700_SBCL_bits[i]);
 491         }
 492         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 493         return ret;
 494 }
 495
 496 static inline __u8
 497 bitmap_to_number(__u8 bitmap)
 498 {
 499         __u8 i;
 500
 501         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 502                 ;
 503         return i;
 504 }
 505
 506 /* Pull a slot off the free list */
 507 STATIC struct NCR_700_command_slot *
 508 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 509 {
 510         struct NCR_700_command_slot *slot = hostdata->free_list;
 511
 512         if(slot == NULL) {
 513                 /* sanity check */
 514                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 515                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 516                 return NULL;
 517         }
 518
 519         if(slot->state != NCR_700_SLOT_FREE)
 520                 /* should panic! */
 521                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 522
 523
 524         hostdata->free_list = slot->ITL_forw;
 525         slot->ITL_forw = NULL;
 526
 527
 528         /* NOTE: set the state to busy here, not queued, since this
 529          * indicates the slot is in use and cannot be run by the IRQ
 530          * finish routine.  If we cannot queue the command when it
 531          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 532         slot->state = NCR_700_SLOT_BUSY;
 533         slot->flags = 0;
 534         hostdata->command_slot_count++;
 535
 536         return slot;
 537 }
 538
 539 STATIC void
 540 free_slot(struct NCR_700_command_slot *slot,
 541           struct NCR_700_Host_Parameters *hostdata)
 542 {
 543         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 544                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 545         }
 546         if(slot->state == NCR_700_SLOT_FREE) {
 547                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 548         }
 549
 550         slot->resume_offset = 0;
 551         slot->cmnd = NULL;
 552         slot->state = NCR_700_SLOT_FREE;
 553         slot->ITL_forw = hostdata->free_list;
 554         hostdata->free_list = slot;
 555         hostdata->command_slot_count--;
 556 }
 557
 558
 559 /* This routine really does very little.  The command is indexed on
 560    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 561 STATIC void
 562 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 563                      struct scsi_cmnd *SCp, __u32 dsp)
 564 {
 565         /* Its just possible that this gets executed twice */
 566         if(SCp != NULL) {
 567                 struct NCR_700_command_slot *slot =
 568                         (struct NCR_700_command_slot *)SCp->host_scribble;
 569
 570                 slot->resume_offset = dsp;
 571         }
 572         hostdata->state = NCR_700_HOST_FREE;
 573         hostdata->cmd = NULL;
 574 }
 575
 576 STATIC inline void
 577 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 578               struct NCR_700_command_slot *slot)
 579 {
 580         if(SCp->sc_data_direction != DMA_NONE &&
 581            SCp->sc_data_direction != DMA_BIDIRECTIONAL)
 582                 scsi_dma_unmap(SCp);
 583 }
 584
 585 STATIC inline void
 586 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 587                struct scsi_cmnd *SCp, int result)
 588 {
 589         hostdata->state = NCR_700_HOST_FREE;
 590         hostdata->cmd = NULL;
 591
 592         if(SCp != NULL) {
 593                 struct NCR_700_command_slot *slot =
 594                         (struct NCR_700_command_slot *)SCp->host_scribble;
 595
 596                 dma_unmap_single(hostdata->dev, slot->pCmd,
 597                                  MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 598                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 599                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 600
 601                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 602                                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 603                         /* restore the old result if the request sense was
 604                          * successful */
 605                         if (result == 0)
 606                                 result = cmnd[7];
 607                         /* restore the original length */
 608                         SCp->cmd_len = cmnd[8];
 609                 } else
 610                         NCR_700_unmap(hostdata, SCp, slot);
 611
 612                 free_slot(slot, hostdata);
 613 #ifdef NCR_700_DEBUG
 614                 if(NCR_700_get_depth(SCp->device) == 0 ||
 615                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 616                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 617                                NCR_700_get_depth(SCp->device));
 618 #endif /* NCR_700_DEBUG */
 619                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 620
 621                 SCp->host_scribble = NULL;
 622                 SCp->result = result;
 623                 SCp->scsi_done(SCp);
 624         } else {
 625                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 626         }
 627 }
 628
 629
 630 STATIC void
 631 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 632 {
 633         /* Bus reset */
 634         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 635         udelay(50);
 636         NCR_700_writeb(0, host, SCNTL1_REG);
 637
 638 }
 639
 640 STATIC void
 641 NCR_700_chip_setup(struct Scsi_Host *host)
 642 {
 643         struct NCR_700_Host_Parameters *hostdata =
 644                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 645         __u8 min_period;
 646         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 647
 648         if(hostdata->chip710) {
 649                 __u8 burst_disable = 0;
 650                 __u8 burst_length = 0;
 651
 652                 switch (hostdata->burst_length) {
 653                         case 1:
 654                                 burst_length = BURST_LENGTH_1;
 655                                 break;
 656                         case 2:
 657                                 burst_length = BURST_LENGTH_2;
 658                                 break;
 659                         case 4:
 660                                 burst_length = BURST_LENGTH_4;
 661                                 break;
 662                         case 8:
 663                                 burst_length = BURST_LENGTH_8;
 664                                 break;
 665                         default:
 666                                 burst_disable = BURST_DISABLE;
 667                                 break;
 668                 }
 669                 hostdata->dcntl_extra |= COMPAT_700_MODE;
 670
 671                 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
 672                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
 673                                host, DMODE_710_REG);
 674                 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
 675                                (hostdata->differential ? DIFF : 0),
 676                                host, CTEST7_REG);
 677                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 678                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 679                                | AUTO_ATN, host, SCNTL0_REG);
 680         } else {
 681                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 682                                host, DMODE_700_REG);
 683                 NCR_700_writeb(hostdata->differential ?
 684                                DIFF : 0, host, CTEST7_REG);
 685                 if(hostdata->fast) {
 686                         /* this is for 700-66, does nothing on 700 */
 687                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 688                                        | GENERATE_RECEIVE_PARITY, host,
 689                                        CTEST8_REG);
 690                 } else {
 691                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 692                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 693                 }
 694         }
 695
 696         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 697         NCR_700_writeb(0, host, SBCL_REG);
 698         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 699
 700         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 701              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 702
 703         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 704         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 705         if(hostdata->clock > 75) {
 706                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 707                 /* do the best we can, but the async clock will be out
 708                  * of spec: sync divider 2, async divider 3 */
 709                 DEBUG(("53c700: sync 2 async 3\n"));
 710                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 711                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 712                 hostdata->sync_clock = hostdata->clock/2;
 713         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 714                 /* sync divider 1.5, async divider 3 */
 715                 DEBUG(("53c700: sync 1.5 async 3\n"));
 716                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 717                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 718                 hostdata->sync_clock = hostdata->clock*2;
 719                 hostdata->sync_clock /= 3;
 720
 721         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 722                 /* sync divider 1, async divider 2 */
 723                 DEBUG(("53c700: sync 1 async 2\n"));
 724                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 725                 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 726                 hostdata->sync_clock = hostdata->clock;
 727         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 728                 /* sync divider 1, async divider 1.5 */
 729                 DEBUG(("53c700: sync 1 async 1.5\n"));
 730                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 731                 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
 732                 hostdata->sync_clock = hostdata->clock;
 733         } else {
 734                 DEBUG(("53c700: sync 1 async 1\n"));
 735                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 736                 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 737                 /* sync divider 1, async divider 1 */
 738                 hostdata->sync_clock = hostdata->clock;
 739         }
 740         /* Calculate the actual minimum period that can be supported
 741          * by our synchronous clock speed.  See the 710 manual for
 742          * exact details of this calculation which is based on a
 743          * setting of the SXFER register */
 744         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 745         hostdata->min_period = NCR_700_MIN_PERIOD;
 746         if(min_period > NCR_700_MIN_PERIOD)
 747                 hostdata->min_period = min_period;
 748 }
 749
 750 STATIC void
 751 NCR_700_chip_reset(struct Scsi_Host *host)
 752 {
 753         struct NCR_700_Host_Parameters *hostdata =
 754                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 755         if(hostdata->chip710) {
 756                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 757                 udelay(100);
 758
 759                 NCR_700_writeb(0, host, ISTAT_REG);
 760         } else {
 761                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 762                 udelay(100);
 763
 764                 NCR_700_writeb(0, host, DCNTL_REG);
 765         }
 766
 767         mdelay(1000);
 768
 769         NCR_700_chip_setup(host);
 770 }
 771
 772 /* The heart of the message processing engine is that the instruction
 773  * immediately after the INT is the normal case (and so must be CLEAR
 774  * ACK).  If we want to do something else, we call that routine in
 775  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 776  * ACK) so that the routine returns correctly to resume its activity
 777  * */
 778 STATIC __u32
 779 process_extended_message(struct Scsi_Host *host,
 780                          struct NCR_700_Host_Parameters *hostdata,
 781                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 782 {
 783         __u32 resume_offset = dsp, temp = dsp + 8;
 784         __u8 pun = 0xff, lun = 0xff;
 785
 786         if(SCp != NULL) {
 787                 pun = SCp->device->id;
 788                 lun = SCp->device->lun;
 789         }
 790
 791         switch(hostdata->msgin[2]) {
 792         case A_SDTR_MSG:
 793                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 794                         struct scsi_target *starget = SCp->device->sdev_target;
 795                         __u8 period = hostdata->msgin[3];
 796                         __u8 offset = hostdata->msgin[4];
 797
 798                         if(offset == 0 || period == 0) {
 799                                 offset = 0;
 800                                 period = 0;
 801                         }
 802
 803                         spi_offset(starget) = offset;
 804                         spi_period(starget) = period;
 805
 806                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 807                                 spi_display_xfer_agreement(starget);
 808                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 809                         }
 810
 811                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 812                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 813
 814                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 815                                        host, SXFER_REG);
 816
 817                 } else {
 818                         /* SDTR message out of the blue, reject it */
 819                         shost_printk(KERN_WARNING, host,
 820                                 "Unexpected SDTR msg\n");
 821                         hostdata->msgout[0] = A_REJECT_MSG;
 822                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 823                         script_patch_16(hostdata->dev, hostdata->script,
 824                                         MessageCount, 1);
 825                         /* SendMsgOut returns, so set up the return
 826                          * address */
 827                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 828                 }
 829                 break;
 830
 831         case A_WDTR_MSG:
 832                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 833                        host->host_no, pun, lun);
 834                 hostdata->msgout[0] = A_REJECT_MSG;
 835                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 836                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 837                                 1);
 838                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 839
 840                 break;
 841
 842         default:
 843                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 844                        host->host_no, pun, lun,
 845                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 846                 spi_print_msg(hostdata->msgin);
 847                 printk("\n");
 848                 /* just reject it */
 849                 hostdata->msgout[0] = A_REJECT_MSG;
 850                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 851                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 852                                 1);
 853                 /* SendMsgOut returns, so set up the return
 854                  * address */
 855                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 856         }
 857         NCR_700_writel(temp, host, TEMP_REG);
 858         return resume_offset;
 859 }
 860
 861 STATIC __u32
 862 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 863                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 864 {
 865         /* work out where to return to */
 866         __u32 temp = dsp + 8, resume_offset = dsp;
 867         __u8 pun = 0xff, lun = 0xff;
 868
 869         if(SCp != NULL) {
 870                 pun = SCp->device->id;
 871                 lun = SCp->device->lun;
 872         }
 873
 874 #ifdef NCR_700_DEBUG
 875         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 876                NCR_700_phase[(dsps & 0xf00) >> 8]);
 877         spi_print_msg(hostdata->msgin);
 878         printk("\n");
 879 #endif
 880
 881         switch(hostdata->msgin[0]) {
 882
 883         case A_EXTENDED_MSG:
 884                 resume_offset =  process_extended_message(host, hostdata, SCp,
 885                                                           dsp, dsps);
 886                 break;
 887
 888         case A_REJECT_MSG:
 889                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 890                         /* Rejected our sync negotiation attempt */
 891                         spi_period(SCp->device->sdev_target) =
 892                                 spi_offset(SCp->device->sdev_target) = 0;
 893                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 894                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 895                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 896                         /* rejected our first simple tag message */
 897                         scmd_printk(KERN_WARNING, SCp,
 898                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 899                         /* we're done negotiating */
 900                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 901                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 902
 903                         SCp->device->tagged_supported = 0;
 904                         SCp->device->simple_tags = 0;
 905                         scsi_change_queue_depth(SCp->device, host->cmd_per_lun);
 906                 } else {
 907                         shost_printk(KERN_WARNING, host,
 908                                 "(%d:%d) Unexpected REJECT Message %s\n",
 909                                pun, lun,
 910                                NCR_700_phase[(dsps & 0xf00) >> 8]);
 911                         /* however, just ignore it */
 912                 }
 913                 break;
 914
 915         case A_PARITY_ERROR_MSG:
 916                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
 917                        pun, lun);
 918                 NCR_700_internal_bus_reset(host);
 919                 break;
 920         case A_SIMPLE_TAG_MSG:
 921                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
 922                        pun, lun, hostdata->msgin[1],
 923                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 924                 /* just ignore it */
 925                 break;
 926         default:
 927                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 928                        host->host_no, pun, lun,
 929                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 930
 931                 spi_print_msg(hostdata->msgin);
 932                 printk("\n");
 933                 /* just reject it */
 934                 hostdata->msgout[0] = A_REJECT_MSG;
 935                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 936                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 937                                 1);
 938                 /* SendMsgOut returns, so set up the return
 939                  * address */
 940                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 941
 942                 break;
 943         }
 944         NCR_700_writel(temp, host, TEMP_REG);
 945         /* set us up to receive another message */
 946         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 947         return resume_offset;
 948 }
 949
 950 STATIC __u32
 951 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 952                          struct Scsi_Host *host,
 953                          struct NCR_700_Host_Parameters *hostdata)
 954 {
 955         __u32 resume_offset = 0;
 956         __u8 pun = 0xff, lun=0xff;
 957
 958         if(SCp != NULL) {
 959                 pun = SCp->device->id;
 960                 lun = SCp->device->lun;
 961         }
 962
 963         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 964                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 965                        hostdata->status[0]));
 966                 /* OK, if TCQ still under negotiation, we now know it works */
 967                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 968                         NCR_700_set_tag_neg_state(SCp->device,
 969                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 970
 971                 /* check for contingent allegiance contitions */
 972                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 973                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 974                         struct NCR_700_command_slot *slot =
 975                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 976                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
 977                                 /* OOPS: bad device, returning another
 978                                  * contingent allegiance condition */
 979                                 scmd_printk(KERN_ERR, SCp,
 980                                         "broken device is looping in contingent allegiance: ignoring\n");
 981                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 982                         } else {
 983                                 char *cmnd =
 984                                         NCR_700_get_sense_cmnd(SCp->device);
 985 #ifdef NCR_DEBUG
 986                                 scsi_print_command(SCp);
 987                                 printk("  cmd %p has status %d, requesting sense\n",
 988                                        SCp, hostdata->status[0]);
 989 #endif
 990                                 /* we can destroy the command here
 991                                  * because the contingent allegiance
 992                                  * condition will cause a retry which
 993                                  * will re-copy the command from the
 994                                  * saved data_cmnd.  We also unmap any
 995                                  * data associated with the command
 996                                  * here */
 997                                 NCR_700_unmap(hostdata, SCp, slot);
 998                                 dma_unmap_single(hostdata->dev, slot->pCmd,
 999                                                  MAX_COMMAND_SIZE,
1000                                                  DMA_TO_DEVICE);
1001
1002                                 cmnd[0] = REQUEST_SENSE;
1003                                 cmnd[1] = (lun & 0x7) << 5;
1004                                 cmnd[2] = 0;
1005                                 cmnd[3] = 0;
1006                                 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1007                                 cmnd[5] = 0;
1008                                 /* Here's a quiet hack: the
1009                                  * REQUEST_SENSE command is six bytes,
1010                                  * so store a flag indicating that
1011                                  * this was an internal sense request
1012                                  * and the original status at the end
1013                                  * of the command */
1014                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1015                                 cmnd[7] = hostdata->status[0];
1016                                 cmnd[8] = SCp->cmd_len;
1017                                 SCp->cmd_len = 6; /* command length for
1018                                                    * REQUEST_SENSE */
1019                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1020                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1021                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1022                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1023                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1024                                 slot->SG[1].pAddr = 0;
1025                                 slot->resume_offset = hostdata->pScript;
1026                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1027                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1028
1029                                 /* queue the command for reissue */
1030                                 slot->state = NCR_700_SLOT_QUEUED;
1031                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1032                                 hostdata->state = NCR_700_HOST_FREE;
1033                                 hostdata->cmd = NULL;
1034                         }
1035                 } else {
1036                         // Currently rely on the mid layer evaluation
1037                         // of the tag queuing capability
1038                         //
1039                         //if(status_byte(hostdata->status[0]) == GOOD &&
1040                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1041                         //      /* Piggy back the tag queueing support
1042                         //       * on this command */
1043                         //      dma_sync_single_for_cpu(hostdata->dev,
1044                         //                          slot->dma_handle,
1045                         //                          SCp->request_bufflen,
1046                         //                          DMA_FROM_DEVICE);
1047                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1048                         //              scmd_printk(KERN_INFO, SCp,
1049                         //                   "Enabling Tag Command Queuing\n");
1050                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1051                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1052                         //      } else {
1053                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1054                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1055                         //      }
1056                         //}
1057                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1058                 }
1059         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1060                 __u8 i = (dsps & 0xf00) >> 8;
1061
1062                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1063                        NCR_700_phase[i],
1064                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1065                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1066                         SCp->cmd_len);
1067                 scsi_print_command(SCp);
1068
1069                 NCR_700_internal_bus_reset(host);
1070         } else if((dsps & 0xfffff000) == A_FATAL) {
1071                 int i = (dsps & 0xfff);
1072
1073                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1074                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1075                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1076                         printk(KERN_ERR "     msg begins %02x %02x\n",
1077                                hostdata->msgin[0], hostdata->msgin[1]);
1078                 }
1079                 NCR_700_internal_bus_reset(host);
1080         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1081 #ifdef NCR_700_DEBUG
1082                 __u8 i = (dsps & 0xf00) >> 8;
1083
1084                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1085                        host->host_no, pun, lun,
1086                        i, NCR_700_phase[i]);
1087 #endif
1088                 save_for_reselection(hostdata, SCp, dsp);
1089
1090         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1091                 __u8 lun;
1092                 struct NCR_700_command_slot *slot;
1093                 __u8 reselection_id = hostdata->reselection_id;
1094                 struct scsi_device *SDp;
1095
1096                 lun = hostdata->msgin[0] & 0x1f;
1097
1098                 hostdata->reselection_id = 0xff;
1099                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1100                        host->host_no, reselection_id, lun));
1101                 /* clear the reselection indicator */
1102                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1103                 if(unlikely(SDp == NULL)) {
1104                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1105                                host->host_no, reselection_id, lun);
1106                         BUG();
1107                 }
1108                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1109                         struct scsi_cmnd *SCp;
1110
1111                         SCp = scsi_host_find_tag(SDp->host, hostdata->msgin[2]);
1112                         if(unlikely(SCp == NULL)) {
1113                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1114                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1115                                 BUG();
1116                         }
1117
1118                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1119                         DDEBUG(KERN_DEBUG, SDp,
1120                                 "reselection is tag %d, slot %p(%d)\n",
1121                                 hostdata->msgin[2], slot, slot->tag);
1122                 } else {
1123                         struct scsi_cmnd *SCp;
1124
1125                         SCp = SDp->current_cmnd;
1126                         if(unlikely(SCp == NULL)) {
1127                                 sdev_printk(KERN_ERR, SDp,
1128                                         "no saved request for untagged cmd\n");
1129                                 BUG();
1130                         }
1131                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1132                 }
1133
1134                 if(slot == NULL) {
1135                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1136                                host->host_no, reselection_id, lun,
1137                                hostdata->msgin[0], hostdata->msgin[1],
1138                                hostdata->msgin[2]);
1139                 } else {
1140                         if(hostdata->state != NCR_700_HOST_BUSY)
1141                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1142                                        host->host_no);
1143                         resume_offset = slot->resume_offset;
1144                         hostdata->cmd = slot->cmnd;
1145
1146                         /* re-patch for this command */
1147                         script_patch_32_abs(hostdata->dev, hostdata->script,
1148                                             CommandAddress, slot->pCmd);
1149                         script_patch_16(hostdata->dev, hostdata->script,
1150                                         CommandCount, slot->cmnd->cmd_len);
1151                         script_patch_32_abs(hostdata->dev, hostdata->script,
1152                                             SGScriptStartAddress,
1153                                             to32bit(&slot->pSG[0].ins));
1154
1155                         /* Note: setting SXFER only works if we're
1156                          * still in the MESSAGE phase, so it is vital
1157                          * that ACK is still asserted when we process
1158                          * the reselection message.  The resume offset
1159                          * should therefore always clear ACK */
1160                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1161                                        host, SXFER_REG);
1162                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1163                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1164                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1165                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1166                         /* I'm just being paranoid here, the command should
1167                          * already have been flushed from the cache */
1168                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1169                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1170
1171
1172
1173                 }
1174         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1175
1176                 /* This section is full of debugging code because I've
1177                  * never managed to reach it.  I think what happens is
1178                  * that, because the 700 runs with selection
1179                  * interrupts enabled the whole time that we take a
1180                  * selection interrupt before we manage to get to the
1181                  * reselected script interrupt */
1182
1183                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1184                 struct NCR_700_command_slot *slot;
1185
1186                 /* Take out our own ID */
1187                 reselection_id &= ~(1<<host->this_id);
1188
1189                 /* I've never seen this happen, so keep this as a printk rather
1190                  * than a debug */
1191                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1192                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1193
1194                 {
1195                         /* FIXME: DEBUGGING CODE */
1196                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1197                         int i;
1198
1199                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1200                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1201                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1202                                         break;
1203                         }
1204                         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);
1205                         SCp =  hostdata->slots[i].cmnd;
1206                 }
1207
1208                 if(SCp != NULL) {
1209                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1210                         /* change slot from busy to queued to redo command */
1211                         slot->state = NCR_700_SLOT_QUEUED;
1212                 }
1213                 hostdata->cmd = NULL;
1214
1215                 if(reselection_id == 0) {
1216                         if(hostdata->reselection_id == 0xff) {
1217                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1218                                 return 0;
1219                         } else {
1220                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1221                                        host->host_no);
1222                                 reselection_id = hostdata->reselection_id;
1223                         }
1224                 } else {
1225
1226                         /* convert to real ID */
1227                         reselection_id = bitmap_to_number(reselection_id);
1228                 }
1229                 hostdata->reselection_id = reselection_id;
1230                 /* just in case we have a stale simple tag message, clear it */
1231                 hostdata->msgin[1] = 0;
1232                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1233                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1234                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1235                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1236                 } else {
1237                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1238                 }
1239         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1240                 /* we've just disconnected from the bus, do nothing since
1241                  * a return here will re-run the queued command slot
1242                  * that may have been interrupted by the initial selection */
1243                 DEBUG((" SELECTION COMPLETED\n"));
1244         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1245                 resume_offset = process_message(host, hostdata, SCp,
1246                                                 dsp, dsps);
1247         } else if((dsps &  0xfffff000) == 0) {
1248                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1249                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1250                        host->host_no, pun, lun, NCR_700_condition[i],
1251                        NCR_700_phase[j], dsp - hostdata->pScript);
1252                 if(SCp != NULL) {
1253                         struct scatterlist *sg;
1254
1255                         scsi_print_command(SCp);
1256                         scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1257                                 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);
1258                         }
1259                 }
1260                 NCR_700_internal_bus_reset(host);
1261         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1262                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1263                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1264                 resume_offset = dsp;
1265         } else {
1266                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1267                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1268                 NCR_700_internal_bus_reset(host);
1269         }
1270         return resume_offset;
1271 }
1272
1273 /* We run the 53c700 with selection interrupts always enabled.  This
1274  * means that the chip may be selected as soon as the bus frees.  On a
1275  * busy bus, this can be before the scripts engine finishes its
1276  * processing.  Therefore, part of the selection processing has to be
1277  * to find out what the scripts engine is doing and complete the
1278  * function if necessary (i.e. process the pending disconnect or save
1279  * the interrupted initial selection */
1280 STATIC inline __u32
1281 process_selection(struct Scsi_Host *host, __u32 dsp)
1282 {
1283         __u8 id = 0;    /* Squash compiler warning */
1284         int count = 0;
1285         __u32 resume_offset = 0;
1286         struct NCR_700_Host_Parameters *hostdata =
1287                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1288         struct scsi_cmnd *SCp = hostdata->cmd;
1289         __u8 sbcl;
1290
1291         for(count = 0; count < 5; count++) {
1292                 id = NCR_700_readb(host, hostdata->chip710 ?
1293                                    CTEST9_REG : SFBR_REG);
1294
1295                 /* Take out our own ID */
1296                 id &= ~(1<<host->this_id);
1297                 if(id != 0)
1298                         break;
1299                 udelay(5);
1300         }
1301         sbcl = NCR_700_readb(host, SBCL_REG);
1302         if((sbcl & SBCL_IO) == 0) {
1303                 /* mark as having been selected rather than reselected */
1304                 id = 0xff;
1305         } else {
1306                 /* convert to real ID */
1307                 hostdata->reselection_id = id = bitmap_to_number(id);
1308                 DEBUG(("scsi%d:  Reselected by %d\n",
1309                        host->host_no, id));
1310         }
1311         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1312                 struct NCR_700_command_slot *slot =
1313                         (struct NCR_700_command_slot *)SCp->host_scribble;
1314                 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));
1315
1316                 switch(dsp - hostdata->pScript) {
1317                 case Ent_Disconnect1:
1318                 case Ent_Disconnect2:
1319                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1320                         break;
1321                 case Ent_Disconnect3:
1322                 case Ent_Disconnect4:
1323                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1324                         break;
1325                 case Ent_Disconnect5:
1326                 case Ent_Disconnect6:
1327                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1328                         break;
1329                 case Ent_Disconnect7:
1330                 case Ent_Disconnect8:
1331                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1332                         break;
1333                 case Ent_Finish1:
1334                 case Ent_Finish2:
1335                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1336                         break;
1337
1338                 default:
1339                         slot->state = NCR_700_SLOT_QUEUED;
1340                         break;
1341                         }
1342         }
1343         hostdata->state = NCR_700_HOST_BUSY;
1344         hostdata->cmd = NULL;
1345         /* clear any stale simple tag message */
1346         hostdata->msgin[1] = 0;
1347         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1348                        DMA_BIDIRECTIONAL);
1349
1350         if(id == 0xff) {
1351                 /* Selected as target, Ignore */
1352                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1353         } else if(hostdata->tag_negotiated & (1<<id)) {
1354                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1355         } else {
1356                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1357         }
1358         return resume_offset;
1359 }
1360
1361 static inline void
1362 NCR_700_clear_fifo(struct Scsi_Host *host) {
1363         const struct NCR_700_Host_Parameters *hostdata
1364                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1365         if(hostdata->chip710) {
1366                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1367         } else {
1368                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1369         }
1370 }
1371
1372 static inline void
1373 NCR_700_flush_fifo(struct Scsi_Host *host) {
1374         const struct NCR_700_Host_Parameters *hostdata
1375                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1376         if(hostdata->chip710) {
1377                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1378                 udelay(10);
1379                 NCR_700_writeb(0, host, CTEST8_REG);
1380         } else {
1381                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1382                 udelay(10);
1383                 NCR_700_writeb(0, host, DFIFO_REG);
1384         }
1385 }
1386
1387
1388 /* The queue lock with interrupts disabled must be held on entry to
1389  * this function */
1390 STATIC int
1391 NCR_700_start_command(struct scsi_cmnd *SCp)
1392 {
1393         struct NCR_700_command_slot *slot =
1394                 (struct NCR_700_command_slot *)SCp->host_scribble;
1395         struct NCR_700_Host_Parameters *hostdata =
1396                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1397         __u16 count = 1;        /* for IDENTIFY message */
1398         u8 lun = SCp->device->lun;
1399
1400         if(hostdata->state != NCR_700_HOST_FREE) {
1401                 /* keep this inside the lock to close the race window where
1402                  * the running command finishes on another CPU while we don't
1403                  * change the state to queued on this one */
1404                 slot->state = NCR_700_SLOT_QUEUED;
1405
1406                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1407                        SCp->device->host->host_no, slot->cmnd, slot));
1408                 return 0;
1409         }
1410         hostdata->state = NCR_700_HOST_BUSY;
1411         hostdata->cmd = SCp;
1412         slot->state = NCR_700_SLOT_BUSY;
1413         /* keep interrupts disabled until we have the command correctly
1414          * set up so we cannot take a selection interrupt */
1415
1416         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1417                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1418                                                lun);
1419         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1420          * if the negotiated transfer parameters still hold, so
1421          * always renegotiate them */
1422         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1423            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1424                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1425         }
1426
1427         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1428          * If a contingent allegiance condition exists, the device
1429          * will refuse all tags, so send the request sense as untagged
1430          * */
1431         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1432            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1433                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1434                 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1435         }
1436
1437         if(hostdata->fast &&
1438            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1439                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1440                                 spi_period(SCp->device->sdev_target),
1441                                 spi_offset(SCp->device->sdev_target));
1442                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1443         }
1444
1445         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1446
1447
1448         script_patch_ID(hostdata->dev, hostdata->script,
1449                         Device_ID, 1<<scmd_id(SCp));
1450
1451         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1452                             slot->pCmd);
1453         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1454                         SCp->cmd_len);
1455         /* finally plumb the beginning of the SG list into the script
1456          * */
1457         script_patch_32_abs(hostdata->dev, hostdata->script,
1458                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1459         NCR_700_clear_fifo(SCp->device->host);
1460
1461         if(slot->resume_offset == 0)
1462                 slot->resume_offset = hostdata->pScript;
1463         /* now perform all the writebacks and invalidates */
1464         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1465         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1466                        DMA_FROM_DEVICE);
1467         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1468         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1469
1470         /* set the synchronous period/offset */
1471         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1472                        SCp->device->host, SXFER_REG);
1473         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1474         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1475
1476         return 1;
1477 }
1478
1479 irqreturn_t
1480 NCR_700_intr(int irq, void *dev_id)
1481 {
1482         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1483         struct NCR_700_Host_Parameters *hostdata =
1484                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1485         __u8 istat;
1486         __u32 resume_offset = 0;
1487         __u8 pun = 0xff, lun = 0xff;
1488         unsigned long flags;
1489         int handled = 0;
1490
1491         /* Use the host lock to serialise access to the 53c700
1492          * hardware.  Note: In future, we may need to take the queue
1493          * lock to enter the done routines.  When that happens, we
1494          * need to ensure that for this driver, the host lock and the
1495          * queue lock point to the same thing. */
1496         spin_lock_irqsave(host->host_lock, flags);
1497         if((istat = NCR_700_readb(host, ISTAT_REG))
1498               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1499                 __u32 dsps;
1500                 __u8 sstat0 = 0, dstat = 0;
1501                 __u32 dsp;
1502                 struct scsi_cmnd *SCp = hostdata->cmd;
1503                 enum NCR_700_Host_State state;
1504
1505                 handled = 1;
1506                 state = hostdata->state;
1507                 SCp = hostdata->cmd;
1508
1509                 if(istat & SCSI_INT_PENDING) {
1510                         udelay(10);
1511
1512                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1513                 }
1514
1515                 if(istat & DMA_INT_PENDING) {
1516                         udelay(10);
1517
1518                         dstat = NCR_700_readb(host, DSTAT_REG);
1519                 }
1520
1521                 dsps = NCR_700_readl(host, DSPS_REG);
1522                 dsp = NCR_700_readl(host, DSP_REG);
1523
1524                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1525                        host->host_no, istat, sstat0, dstat,
1526                        (dsp - (__u32)(hostdata->pScript))/4,
1527                        dsp, dsps));
1528
1529                 if(SCp != NULL) {
1530                         pun = SCp->device->id;
1531                         lun = SCp->device->lun;
1532                 }
1533
1534                 if(sstat0 & SCSI_RESET_DETECTED) {
1535                         struct scsi_device *SDp;
1536                         int i;
1537
1538                         hostdata->state = NCR_700_HOST_BUSY;
1539
1540                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1541                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1542
1543                         scsi_report_bus_reset(host, 0);
1544
1545                         /* clear all the negotiated parameters */
1546                         __shost_for_each_device(SDp, host)
1547                                 NCR_700_clear_flag(SDp, ~0);
1548
1549                         /* clear all the slots and their pending commands */
1550                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1551                                 struct scsi_cmnd *SCp;
1552                                 struct NCR_700_command_slot *slot =
1553                                         &hostdata->slots[i];
1554
1555                                 if(slot->state == NCR_700_SLOT_FREE)
1556                                         continue;
1557
1558                                 SCp = slot->cmnd;
1559                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1560                                        slot, SCp);
1561                                 free_slot(slot, hostdata);
1562                                 SCp->host_scribble = NULL;
1563                                 NCR_700_set_depth(SCp->device, 0);
1564                                 /* NOTE: deadlock potential here: we
1565                                  * rely on mid-layer guarantees that
1566                                  * scsi_done won't try to issue the
1567                                  * command again otherwise we'll
1568                                  * deadlock on the
1569                                  * hostdata->state_lock */
1570                                 SCp->result = DID_RESET << 16;
1571                                 SCp->scsi_done(SCp);
1572                         }
1573                         mdelay(25);
1574                         NCR_700_chip_setup(host);
1575
1576                         hostdata->state = NCR_700_HOST_FREE;
1577                         hostdata->cmd = NULL;
1578                         /* signal back if this was an eh induced reset */
1579                         if(hostdata->eh_complete != NULL)
1580                                 complete(hostdata->eh_complete);
1581                         goto out_unlock;
1582                 } else if(sstat0 & SELECTION_TIMEOUT) {
1583                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1584                                host->host_no, pun, lun));
1585                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1586                 } else if(sstat0 & PHASE_MISMATCH) {
1587                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1588                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1589
1590                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1591                                 /* It wants to reply to some part of
1592                                  * our message */
1593 #ifdef NCR_700_DEBUG
1594                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1595                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1596                                 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)));
1597 #endif
1598                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1599                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1600                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1601                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1602                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1603                                 int residual = NCR_700_data_residual(host);
1604                                 int i;
1605 #ifdef NCR_700_DEBUG
1606                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1607
1608                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1609                                        host->host_no, pun, lun,
1610                                        SGcount, data_transfer);
1611                                 scsi_print_command(SCp);
1612                                 if(residual) {
1613                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1614                                        host->host_no, pun, lun,
1615                                        SGcount, data_transfer, residual);
1616                                 }
1617 #endif
1618                                 data_transfer += residual;
1619
1620                                 if(data_transfer != 0) {
1621                                         int count;
1622                                         __u32 pAddr;
1623
1624                                         SGcount--;
1625
1626                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1627                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1628                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1629                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1630                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1631                                         pAddr += (count - data_transfer);
1632 #ifdef NCR_700_DEBUG
1633                                         if(pAddr != naddr) {
1634                                                 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);
1635                                         }
1636 #endif
1637                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1638                                 }
1639                                 /* set the executed moves to nops */
1640                                 for(i=0; i<SGcount; i++) {
1641                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1642                                         slot->SG[i].pAddr = 0;
1643                                 }
1644                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1645                                 /* and pretend we disconnected after
1646                                  * the command phase */
1647                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1648                                 /* make sure all the data is flushed */
1649                                 NCR_700_flush_fifo(host);
1650                         } else {
1651                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1652                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1653                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1654                                 NCR_700_internal_bus_reset(host);
1655                         }
1656
1657                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1658                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1659                                host->host_no, pun, lun);
1660                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661                 } else if(sstat0 & PARITY_ERROR) {
1662                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1663                                host->host_no, pun, lun);
1664                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1666                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1667                                host->host_no, pun, lun));
1668                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1669                 } else if(dstat & (ILGL_INST_DETECTED)) {
1670                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1671                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1672                                host->host_no, pun, lun,
1673                                dsp, dsp - hostdata->pScript);
1674                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1676                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1677                                host->host_no, pun, lun, dstat);
1678                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679                 }
1680
1681
1682                 /* NOTE: selection interrupt processing MUST occur
1683                  * after script interrupt processing to correctly cope
1684                  * with the case where we process a disconnect and
1685                  * then get reselected before we process the
1686                  * disconnection */
1687                 if(sstat0 & SELECTED) {
1688                         /* FIXME: It currently takes at least FOUR
1689                          * interrupts to complete a command that
1690                          * disconnects: one for the disconnect, one
1691                          * for the reselection, one to get the
1692                          * reselection data and one to complete the
1693                          * command.  If we guess the reselected
1694                          * command here and prepare it, we only need
1695                          * to get a reselection data interrupt if we
1696                          * guessed wrongly.  Since the interrupt
1697                          * overhead is much greater than the command
1698                          * setup, this would be an efficient
1699                          * optimisation particularly as we probably
1700                          * only have one outstanding command on a
1701                          * target most of the time */
1702
1703                         resume_offset = process_selection(host, dsp);
1704
1705                 }
1706
1707         }
1708
1709         if(resume_offset) {
1710                 if(hostdata->state != NCR_700_HOST_BUSY) {
1711                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1712                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1713                         hostdata->state = NCR_700_HOST_BUSY;
1714                 }
1715
1716                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1717                 NCR_700_clear_fifo(host);
1718                 NCR_700_writel(resume_offset, host, DSP_REG);
1719         }
1720         /* There is probably a technical no-no about this: If we're a
1721          * shared interrupt and we got this interrupt because the
1722          * other device needs servicing not us, we're still going to
1723          * check our queued commands here---of course, there shouldn't
1724          * be any outstanding.... */
1725         if(hostdata->state == NCR_700_HOST_FREE) {
1726                 int i;
1727
1728                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1729                         /* fairness: always run the queue from the last
1730                          * position we left off */
1731                         int j = (i + hostdata->saved_slot_position)
1732                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1733
1734                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1735                                 continue;
1736                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1737                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1738                                        host->host_no, &hostdata->slots[j],
1739                                        hostdata->slots[j].cmnd));
1740                                 hostdata->saved_slot_position = j + 1;
1741                         }
1742
1743                         break;
1744                 }
1745         }
1746  out_unlock:
1747         spin_unlock_irqrestore(host->host_lock, flags);
1748         return IRQ_RETVAL(handled);
1749 }
1750
1751 static int
1752 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1753 {
1754         struct NCR_700_Host_Parameters *hostdata =
1755                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1756         __u32 move_ins;
1757         enum dma_data_direction direction;
1758         struct NCR_700_command_slot *slot;
1759
1760         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1761                 /* We're over our allocation, this should never happen
1762                  * since we report the max allocation to the mid layer */
1763                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1764                 return 1;
1765         }
1766         /* check for untagged commands.  We cannot have any outstanding
1767          * commands if we accept them.  Commands could be untagged because:
1768          *
1769          * - The tag negotiated bitmap is clear
1770          * - The blk layer sent and untagged command
1771          */
1772         if(NCR_700_get_depth(SCp->device) != 0
1773            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1774                || !(SCp->flags & SCMD_TAGGED))) {
1775                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1776                        NCR_700_get_depth(SCp->device));
1777                 return SCSI_MLQUEUE_DEVICE_BUSY;
1778         }
1779         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1780                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1781                        NCR_700_get_depth(SCp->device));
1782                 return SCSI_MLQUEUE_DEVICE_BUSY;
1783         }
1784         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1785
1786         /* begin the command here */
1787         /* no need to check for NULL, test for command_slot_count above
1788          * ensures a slot is free */
1789         slot = find_empty_slot(hostdata);
1790
1791         slot->cmnd = SCp;
1792
1793         SCp->scsi_done = done;
1794         SCp->host_scribble = (unsigned char *)slot;
1795         SCp->SCp.ptr = NULL;
1796         SCp->SCp.buffer = NULL;
1797
1798 #ifdef NCR_700_DEBUG
1799         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1800         scsi_print_command(SCp);
1801 #endif
1802         if ((SCp->flags & SCMD_TAGGED)
1803            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1804            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1805                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1806                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1807                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1808         }
1809
1810         /* here we may have to process an untagged command.  The gate
1811          * above ensures that this will be the only one outstanding,
1812          * so clear the tag negotiated bit.
1813          *
1814          * FIXME: This will royally screw up on multiple LUN devices
1815          * */
1816         if (!(SCp->flags & SCMD_TAGGED)
1817            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1818                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1819                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1820         }
1821
1822         if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&
1823             SCp->device->simple_tags) {
1824                 slot->tag = SCp->request->tag;
1825                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1826                        slot->tag, slot);
1827         } else {
1828                 slot->tag = SCSI_NO_TAG;
1829                 /* save current command for reselection */
1830                 SCp->device->current_cmnd = SCp;
1831         }
1832         /* sanity check: some of the commands generated by the mid-layer
1833          * have an eccentric idea of their sc_data_direction */
1834         if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1835            SCp->sc_data_direction != DMA_NONE) {
1836 #ifdef NCR_700_DEBUG
1837                 printk("53c700: Command");
1838                 scsi_print_command(SCp);
1839                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1840 #endif
1841                 SCp->sc_data_direction = DMA_NONE;
1842         }
1843
1844         switch (SCp->cmnd[0]) {
1845         case REQUEST_SENSE:
1846                 /* clear the internal sense magic */
1847                 SCp->cmnd[6] = 0;
1848                 /* fall through */
1849         default:
1850                 /* OK, get it from the command */
1851                 switch(SCp->sc_data_direction) {
1852                 case DMA_BIDIRECTIONAL:
1853                 default:
1854                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1855                         scsi_print_command(SCp);
1856
1857                         move_ins = 0;
1858                         break;
1859                 case DMA_NONE:
1860                         move_ins = 0;
1861                         break;
1862                 case DMA_FROM_DEVICE:
1863                         move_ins = SCRIPT_MOVE_DATA_IN;
1864                         break;
1865                 case DMA_TO_DEVICE:
1866                         move_ins = SCRIPT_MOVE_DATA_OUT;
1867                         break;
1868                 }
1869         }
1870
1871         /* now build the scatter gather list */
1872         direction = SCp->sc_data_direction;
1873         if(move_ins != 0) {
1874                 int i;
1875                 int sg_count;
1876                 dma_addr_t vPtr = 0;
1877                 struct scatterlist *sg;
1878                 __u32 count = 0;
1879
1880                 sg_count = scsi_dma_map(SCp);
1881                 BUG_ON(sg_count < 0);
1882
1883                 scsi_for_each_sg(SCp, sg, sg_count, i) {
1884                         vPtr = sg_dma_address(sg);
1885                         count = sg_dma_len(sg);
1886
1887                         slot->SG[i].ins = bS_to_host(move_ins | count);
1888                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1889                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1890                         slot->SG[i].pAddr = bS_to_host(vPtr);
1891                 }
1892                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1893                 slot->SG[i].pAddr = 0;
1894                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1895                 DEBUG((" SETTING %08lx to %x\n",
1896                        (&slot->pSG[i].ins),
1897                        slot->SG[i].ins));
1898         }
1899         slot->resume_offset = 0;
1900         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1901                                     MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1902         NCR_700_start_command(SCp);
1903         return 0;
1904 }
1905
1906 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1907
1908 STATIC int
1909 NCR_700_abort(struct scsi_cmnd * SCp)
1910 {
1911         struct NCR_700_command_slot *slot;
1912
1913         scmd_printk(KERN_INFO, SCp, "abort command\n");
1914
1915         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1916
1917         if(slot == NULL)
1918                 /* no outstanding command to abort */
1919                 return SUCCESS;
1920         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1921                 /* FIXME: This is because of a problem in the new
1922                  * error handler.  When it is in error recovery, it
1923                  * will send a TUR to a device it thinks may still be
1924                  * showing a problem.  If the TUR isn't responded to,
1925                  * it will abort it and mark the device off line.
1926                  * Unfortunately, it does no other error recovery, so
1927                  * this would leave us with an outstanding command
1928                  * occupying a slot.  Rather than allow this to
1929                  * happen, we issue a bus reset to force all
1930                  * outstanding commands to terminate here. */
1931                 NCR_700_internal_bus_reset(SCp->device->host);
1932                 /* still drop through and return failed */
1933         }
1934         return FAILED;
1935
1936 }
1937
1938 STATIC int
1939 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1940 {
1941         DECLARE_COMPLETION_ONSTACK(complete);
1942         struct NCR_700_Host_Parameters *hostdata =
1943                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1944
1945         scmd_printk(KERN_INFO, SCp,
1946                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1947         scsi_print_command(SCp);
1948
1949         /* In theory, eh_complete should always be null because the
1950          * eh is single threaded, but just in case we're handling a
1951          * reset via sg or something */
1952         spin_lock_irq(SCp->device->host->host_lock);
1953         while (hostdata->eh_complete != NULL) {
1954                 spin_unlock_irq(SCp->device->host->host_lock);
1955                 msleep_interruptible(100);
1956                 spin_lock_irq(SCp->device->host->host_lock);
1957         }
1958
1959         hostdata->eh_complete = &complete;
1960         NCR_700_internal_bus_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 int
1976 NCR_700_host_reset(struct scsi_cmnd * SCp)
1977 {
1978         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1979         scsi_print_command(SCp);
1980
1981         spin_lock_irq(SCp->device->host->host_lock);
1982
1983         NCR_700_internal_bus_reset(SCp->device->host);
1984         NCR_700_chip_reset(SCp->device->host);
1985
1986         spin_unlock_irq(SCp->device->host->host_lock);
1987
1988         return SUCCESS;
1989 }
1990
1991 STATIC void
1992 NCR_700_set_period(struct scsi_target *STp, int period)
1993 {
1994         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1995         struct NCR_700_Host_Parameters *hostdata =
1996                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1997
1998         if(!hostdata->fast)
1999                 return;
2000
2001         if(period < hostdata->min_period)
2002                 period = hostdata->min_period;
2003
2004         spi_period(STp) = period;
2005         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2006                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2007         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2008 }
2009
2010 STATIC void
2011 NCR_700_set_offset(struct scsi_target *STp, int offset)
2012 {
2013         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2014         struct NCR_700_Host_Parameters *hostdata =
2015                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2016         int max_offset = hostdata->chip710
2017                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2018
2019         if(!hostdata->fast)
2020                 return;
2021
2022         if(offset > max_offset)
2023                 offset = max_offset;
2024
2025         /* if we're currently async, make sure the period is reasonable */
2026         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2027                                     spi_period(STp) > 0xff))
2028                 spi_period(STp) = hostdata->min_period;
2029
2030         spi_offset(STp) = offset;
2031         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2032                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2033         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2034 }
2035
2036 STATIC int
2037 NCR_700_slave_alloc(struct scsi_device *SDp)
2038 {
2039         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2040                                 GFP_KERNEL);
2041
2042         if (!SDp->hostdata)
2043                 return -ENOMEM;
2044
2045         return 0;
2046 }
2047
2048 STATIC int
2049 NCR_700_slave_configure(struct scsi_device *SDp)
2050 {
2051         struct NCR_700_Host_Parameters *hostdata =
2052                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2053
2054         /* to do here: allocate memory; build a queue_full list */
2055         if(SDp->tagged_supported) {
2056                 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2057                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2058         }
2059
2060         if(hostdata->fast) {
2061                 /* Find the correct offset and period via domain validation */
2062                 if (!spi_initial_dv(SDp->sdev_target))
2063                         spi_dv_device(SDp);
2064         } else {
2065                 spi_offset(SDp->sdev_target) = 0;
2066                 spi_period(SDp->sdev_target) = 0;
2067         }
2068         return 0;
2069 }
2070
2071 STATIC void
2072 NCR_700_slave_destroy(struct scsi_device *SDp)
2073 {
2074         kfree(SDp->hostdata);
2075         SDp->hostdata = NULL;
2076 }
2077
2078 static int
2079 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2080 {
2081         if (depth > NCR_700_MAX_TAGS)
2082                 depth = NCR_700_MAX_TAGS;
2083         return scsi_change_queue_depth(SDp, depth);
2084 }
2085
2086 static ssize_t
2087 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2088 {
2089         struct scsi_device *SDp = to_scsi_device(dev);
2090
2091         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2092 }
2093
2094 static struct device_attribute NCR_700_active_tags_attr = {
2095         .attr = {
2096                 .name =         "active_tags",
2097                 .mode =         S_IRUGO,
2098         },
2099         .show = NCR_700_show_active_tags,
2100 };
2101
2102 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2103         &NCR_700_active_tags_attr,
2104         NULL,
2105 };
2106
2107 EXPORT_SYMBOL(NCR_700_detect);
2108 EXPORT_SYMBOL(NCR_700_release);
2109 EXPORT_SYMBOL(NCR_700_intr);
2110
2111 static struct spi_function_template NCR_700_transport_functions =  {
2112         .set_period     = NCR_700_set_period,
2113         .show_period    = 1,
2114         .set_offset     = NCR_700_set_offset,
2115         .show_offset    = 1,
2116 };
2117
2118 static int __init NCR_700_init(void)
2119 {
2120         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2121         if(!NCR_700_transport_template)
2122                 return -ENODEV;
2123         return 0;
2124 }
2125
2126 static void __exit NCR_700_exit(void)
2127 {
2128         spi_release_transport(NCR_700_transport_template);
2129 }
2130
2131 module_init(NCR_700_init);
2132 module_exit(NCR_700_exit);
2133