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 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
 180
 181 STATIC struct device_attribute *NCR_700_dev_attrs[];
 182
 183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 184
 185 static char *NCR_700_phase[] = {
 186         "",
 187         "after selection",
 188         "before command phase",
 189         "after command phase",
 190         "after status phase",
 191         "after data in phase",
 192         "after data out phase",
 193         "during data phase",
 194 };
 195
 196 static char *NCR_700_condition[] = {
 197         "",
 198         "NOT MSG_OUT",
 199         "UNEXPECTED PHASE",
 200         "NOT MSG_IN",
 201         "UNEXPECTED MSG",
 202         "MSG_IN",
 203         "SDTR_MSG RECEIVED",
 204         "REJECT_MSG RECEIVED",
 205         "DISCONNECT_MSG RECEIVED",
 206         "MSG_OUT",
 207         "DATA_IN",
 208
 209 };
 210
 211 static char *NCR_700_fatal_messages[] = {
 212         "unexpected message after reselection",
 213         "still MSG_OUT after message injection",
 214         "not MSG_IN after selection",
 215         "Illegal message length received",
 216 };
 217
 218 static char *NCR_700_SBCL_bits[] = {
 219         "IO ",
 220         "CD ",
 221         "MSG ",
 222         "ATN ",
 223         "SEL ",
 224         "BSY ",
 225         "ACK ",
 226         "REQ ",
 227 };
 228
 229 static char *NCR_700_SBCL_to_phase[] = {
 230         "DATA_OUT",
 231         "DATA_IN",
 232         "CMD_OUT",
 233         "STATE",
 234         "ILLEGAL PHASE",
 235         "ILLEGAL PHASE",
 236         "MSG OUT",
 237         "MSG IN",
 238 };
 239
 240 /* This translates the SDTR message offset and period to a value
 241  * which can be loaded into the SXFER_REG.
 242  *
 243  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 244  *       actually four times this period value */
 245 static inline __u8
 246 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 247                                __u8 offset, __u8 period)
 248 {
 249         int XFERP;
 250
 251         __u8 min_xferp = (hostdata->chip710
 252                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 253         __u8 max_offset = (hostdata->chip710
 254                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 255
 256         if(offset == 0)
 257                 return 0;
 258
 259         if(period < hostdata->min_period) {
 260                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 261                 period = hostdata->min_period;
 262         }
 263         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 264         if(offset > max_offset) {
 265                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 266                        offset, max_offset);
 267                 offset = max_offset;
 268         }
 269         if(XFERP < min_xferp) {
 270                 XFERP =  min_xferp;
 271         }
 272         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 273 }
 274
 275 static inline __u8
 276 NCR_700_get_SXFER(struct scsi_device *SDp)
 277 {
 278         struct NCR_700_Host_Parameters *hostdata =
 279                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 280
 281         return NCR_700_offset_period_to_sxfer(hostdata,
 282                                               spi_offset(SDp->sdev_target),
 283                                               spi_period(SDp->sdev_target));
 284 }
 285
 286 struct Scsi_Host *
 287 NCR_700_detect(struct scsi_host_template *tpnt,
 288                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 289 {
 290         dma_addr_t pScript, pSlots;
 291         __u8 *memory;
 292         __u32 *script;
 293         struct Scsi_Host *host;
 294         static int banner = 0;
 295         int j;
 296
 297         if(tpnt->sdev_attrs == NULL)
 298                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 299
 300         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 301                                        &pScript, GFP_KERNEL);
 302         if(memory == NULL) {
 303                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
 304                 return NULL;
 305         }
 306
 307         script = (__u32 *)memory;
 308         hostdata->msgin = memory + MSGIN_OFFSET;
 309         hostdata->msgout = memory + MSGOUT_OFFSET;
 310         hostdata->status = memory + STATUS_OFFSET;
 311         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 312         hostdata->dev = dev;
 313
 314         pSlots = pScript + SLOTS_OFFSET;
 315
 316         /* Fill in the missing routines from the host template */
 317         tpnt->queuecommand = NCR_700_queuecommand;
 318         tpnt->eh_abort_handler = NCR_700_abort;
 319         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
 320         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 321         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 322         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 323         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 324         tpnt->use_clustering = ENABLE_CLUSTERING;
 325         tpnt->slave_configure = NCR_700_slave_configure;
 326         tpnt->slave_destroy = NCR_700_slave_destroy;
 327         tpnt->slave_alloc = NCR_700_slave_alloc;
 328         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 329         tpnt->change_queue_type = NCR_700_change_queue_type;
 330         tpnt->use_blk_tags = 1;
 331
 332         if(tpnt->name == NULL)
 333                 tpnt->name = "53c700";
 334         if(tpnt->proc_name == NULL)
 335                 tpnt->proc_name = "53c700";
 336
 337         host = scsi_host_alloc(tpnt, 4);
 338         if (!host)
 339                 return NULL;
 340         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 341                * NCR_700_COMMAND_SLOTS_PER_HOST);
 342         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 343                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 344                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 345                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 346                 if(j == 0)
 347                         hostdata->free_list = &hostdata->slots[j];
 348                 else
 349                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 350                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 351         }
 352
 353         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 354                 script[j] = bS_to_host(SCRIPT[j]);
 355
 356         /* adjust all labels to be bus physical */
 357         for (j = 0; j < PATCHES; j++)
 358                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 359         /* now patch up fixed addresses. */
 360         script_patch_32(hostdata->dev, script, MessageLocation,
 361                         pScript + MSGOUT_OFFSET);
 362         script_patch_32(hostdata->dev, script, StatusAddress,
 363                         pScript + STATUS_OFFSET);
 364         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
 365                         pScript + MSGIN_OFFSET);
 366
 367         hostdata->script = script;
 368         hostdata->pScript = pScript;
 369         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 370         hostdata->state = NCR_700_HOST_FREE;
 371         hostdata->cmd = NULL;
 372         host->max_id = 8;
 373         host->max_lun = NCR_700_MAX_LUNS;
 374         BUG_ON(NCR_700_transport_template == NULL);
 375         host->transportt = NCR_700_transport_template;
 376         host->unique_id = (unsigned long)hostdata->base;
 377         hostdata->eh_complete = NULL;
 378         host->hostdata[0] = (unsigned long)hostdata;
 379         /* kick the chip */
 380         NCR_700_writeb(0xff, host, CTEST9_REG);
 381         if (hostdata->chip710)
 382                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 383         else
 384                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 385         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 386         if (banner == 0) {
 387                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 388                 banner = 1;
 389         }
 390         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 391                hostdata->chip710 ? "53c710" :
 392                (hostdata->fast ? "53c700-66" : "53c700"),
 393                hostdata->rev, hostdata->differential ?
 394                "(Differential)" : "");
 395         /* reset the chip */
 396         NCR_700_chip_reset(host);
 397
 398         if (scsi_add_host(host, dev)) {
 399                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 400                 scsi_host_put(host);
 401                 return NULL;
 402         }
 403
 404         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 405                 SPI_SIGNAL_SE;
 406
 407         return host;
 408 }
 409
 410 int
 411 NCR_700_release(struct Scsi_Host *host)
 412 {
 413         struct NCR_700_Host_Parameters *hostdata =
 414                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 415
 416         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 417                                hostdata->script, hostdata->pScript);
 418         return 1;
 419 }
 420
 421 static inline __u8
 422 NCR_700_identify(int can_disconnect, __u8 lun)
 423 {
 424         return IDENTIFY_BASE |
 425                 ((can_disconnect) ? 0x40 : 0) |
 426                 (lun & NCR_700_LUN_MASK);
 427 }
 428
 429 /*
 430  * Function : static int data_residual (Scsi_Host *host)
 431  *
 432  * Purpose : return residual data count of what's in the chip.  If you
 433  * really want to know what this function is doing, it's almost a
 434  * direct transcription of the algorithm described in the 53c710
 435  * guide, except that the DBC and DFIFO registers are only 6 bits
 436  * wide on a 53c700.
 437  *
 438  * Inputs : host - SCSI host */
 439 static inline int
 440 NCR_700_data_residual (struct Scsi_Host *host) {
 441         struct NCR_700_Host_Parameters *hostdata =
 442                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 443         int count, synchronous = 0;
 444         unsigned int ddir;
 445
 446         if(hostdata->chip710) {
 447                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 448                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 449         } else {
 450                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 451                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 452         }
 453
 454         if(hostdata->fast)
 455                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 456
 457         /* get the data direction */
 458         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 459
 460         if (ddir) {
 461                 /* Receive */
 462                 if (synchronous)
 463                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 464                 else
 465                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 466                                 ++count;
 467         } else {
 468                 /* Send */
 469                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 470                 if (sstat & SODL_REG_FULL)
 471                         ++count;
 472                 if (synchronous && (sstat & SODR_REG_FULL))
 473                         ++count;
 474         }
 475 #ifdef NCR_700_DEBUG
 476         if(count)
 477                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 478 #endif
 479         return count;
 480 }
 481
 482 /* print out the SCSI wires and corresponding phase from the SBCL register
 483  * in the chip */
 484 static inline char *
 485 sbcl_to_string(__u8 sbcl)
 486 {
 487         int i;
 488         static char ret[256];
 489
 490         ret[0]='\0';
 491         for(i=0; i<8; i++) {
 492                 if((1<<i) & sbcl)
 493                         strcat(ret, NCR_700_SBCL_bits[i]);
 494         }
 495         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 496         return ret;
 497 }
 498
 499 static inline __u8
 500 bitmap_to_number(__u8 bitmap)
 501 {
 502         __u8 i;
 503
 504         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 505                 ;
 506         return i;
 507 }
 508
 509 /* Pull a slot off the free list */
 510 STATIC struct NCR_700_command_slot *
 511 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 512 {
 513         struct NCR_700_command_slot *slot = hostdata->free_list;
 514
 515         if(slot == NULL) {
 516                 /* sanity check */
 517                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 518                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 519                 return NULL;
 520         }
 521
 522         if(slot->state != NCR_700_SLOT_FREE)
 523                 /* should panic! */
 524                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 525
 526
 527         hostdata->free_list = slot->ITL_forw;
 528         slot->ITL_forw = NULL;
 529
 530
 531         /* NOTE: set the state to busy here, not queued, since this
 532          * indicates the slot is in use and cannot be run by the IRQ
 533          * finish routine.  If we cannot queue the command when it
 534          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 535         slot->state = NCR_700_SLOT_BUSY;
 536         slot->flags = 0;
 537         hostdata->command_slot_count++;
 538
 539         return slot;
 540 }
 541
 542 STATIC void
 543 free_slot(struct NCR_700_command_slot *slot,
 544           struct NCR_700_Host_Parameters *hostdata)
 545 {
 546         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 547                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 548         }
 549         if(slot->state == NCR_700_SLOT_FREE) {
 550                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 551         }
 552
 553         slot->resume_offset = 0;
 554         slot->cmnd = NULL;
 555         slot->state = NCR_700_SLOT_FREE;
 556         slot->ITL_forw = hostdata->free_list;
 557         hostdata->free_list = slot;
 558         hostdata->command_slot_count--;
 559 }
 560
 561
 562 /* This routine really does very little.  The command is indexed on
 563    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 564 STATIC void
 565 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 566                      struct scsi_cmnd *SCp, __u32 dsp)
 567 {
 568         /* Its just possible that this gets executed twice */
 569         if(SCp != NULL) {
 570                 struct NCR_700_command_slot *slot =
 571                         (struct NCR_700_command_slot *)SCp->host_scribble;
 572
 573                 slot->resume_offset = dsp;
 574         }
 575         hostdata->state = NCR_700_HOST_FREE;
 576         hostdata->cmd = NULL;
 577 }
 578
 579 STATIC inline void
 580 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 581               struct NCR_700_command_slot *slot)
 582 {
 583         if(SCp->sc_data_direction != DMA_NONE &&
 584            SCp->sc_data_direction != DMA_BIDIRECTIONAL)
 585                 scsi_dma_unmap(SCp);
 586 }
 587
 588 STATIC inline void
 589 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 590                struct scsi_cmnd *SCp, int result)
 591 {
 592         hostdata->state = NCR_700_HOST_FREE;
 593         hostdata->cmd = NULL;
 594
 595         if(SCp != NULL) {
 596                 struct NCR_700_command_slot *slot =
 597                         (struct NCR_700_command_slot *)SCp->host_scribble;
 598
 599                 dma_unmap_single(hostdata->dev, slot->pCmd,
 600                                  MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 601                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 602                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 603
 604                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 605                                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 606                         /* restore the old result if the request sense was
 607                          * successful */
 608                         if (result == 0)
 609                                 result = cmnd[7];
 610                         /* restore the original length */
 611                         SCp->cmd_len = cmnd[8];
 612                 } else
 613                         NCR_700_unmap(hostdata, SCp, slot);
 614
 615                 free_slot(slot, hostdata);
 616 #ifdef NCR_700_DEBUG
 617                 if(NCR_700_get_depth(SCp->device) == 0 ||
 618                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 619                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 620                                NCR_700_get_depth(SCp->device));
 621 #endif /* NCR_700_DEBUG */
 622                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 623
 624                 SCp->host_scribble = NULL;
 625                 SCp->result = result;
 626                 SCp->scsi_done(SCp);
 627         } else {
 628                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 629         }
 630 }
 631
 632
 633 STATIC void
 634 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 635 {
 636         /* Bus reset */
 637         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 638         udelay(50);
 639         NCR_700_writeb(0, host, SCNTL1_REG);
 640
 641 }
 642
 643 STATIC void
 644 NCR_700_chip_setup(struct Scsi_Host *host)
 645 {
 646         struct NCR_700_Host_Parameters *hostdata =
 647                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 648         __u8 min_period;
 649         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 650
 651         if(hostdata->chip710) {
 652                 __u8 burst_disable = 0;
 653                 __u8 burst_length = 0;
 654
 655                 switch (hostdata->burst_length) {
 656                         case 1:
 657                                 burst_length = BURST_LENGTH_1;
 658                                 break;
 659                         case 2:
 660                                 burst_length = BURST_LENGTH_2;
 661                                 break;
 662                         case 4:
 663                                 burst_length = BURST_LENGTH_4;
 664                                 break;
 665                         case 8:
 666                                 burst_length = BURST_LENGTH_8;
 667                                 break;
 668                         default:
 669                                 burst_disable = BURST_DISABLE;
 670                                 break;
 671                 }
 672                 hostdata->dcntl_extra |= COMPAT_700_MODE;
 673
 674                 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
 675                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
 676                                host, DMODE_710_REG);
 677                 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
 678                                (hostdata->differential ? DIFF : 0),
 679                                host, CTEST7_REG);
 680                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 681                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 682                                | AUTO_ATN, host, SCNTL0_REG);
 683         } else {
 684                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 685                                host, DMODE_700_REG);
 686                 NCR_700_writeb(hostdata->differential ?
 687                                DIFF : 0, host, CTEST7_REG);
 688                 if(hostdata->fast) {
 689                         /* this is for 700-66, does nothing on 700 */
 690                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 691                                        | GENERATE_RECEIVE_PARITY, host,
 692                                        CTEST8_REG);
 693                 } else {
 694                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 695                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 696                 }
 697         }
 698
 699         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 700         NCR_700_writeb(0, host, SBCL_REG);
 701         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 702
 703         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 704              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 705
 706         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 707         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 708         if(hostdata->clock > 75) {
 709                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 710                 /* do the best we can, but the async clock will be out
 711                  * of spec: sync divider 2, async divider 3 */
 712                 DEBUG(("53c700: sync 2 async 3\n"));
 713                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 714                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 715                 hostdata->sync_clock = hostdata->clock/2;
 716         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 717                 /* sync divider 1.5, async divider 3 */
 718                 DEBUG(("53c700: sync 1.5 async 3\n"));
 719                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 720                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 721                 hostdata->sync_clock = hostdata->clock*2;
 722                 hostdata->sync_clock /= 3;
 723
 724         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 725                 /* sync divider 1, async divider 2 */
 726                 DEBUG(("53c700: sync 1 async 2\n"));
 727                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 728                 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 729                 hostdata->sync_clock = hostdata->clock;
 730         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 731                 /* sync divider 1, async divider 1.5 */
 732                 DEBUG(("53c700: sync 1 async 1.5\n"));
 733                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 734                 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
 735                 hostdata->sync_clock = hostdata->clock;
 736         } else {
 737                 DEBUG(("53c700: sync 1 async 1\n"));
 738                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 739                 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 740                 /* sync divider 1, async divider 1 */
 741                 hostdata->sync_clock = hostdata->clock;
 742         }
 743         /* Calculate the actual minimum period that can be supported
 744          * by our synchronous clock speed.  See the 710 manual for
 745          * exact details of this calculation which is based on a
 746          * setting of the SXFER register */
 747         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 748         hostdata->min_period = NCR_700_MIN_PERIOD;
 749         if(min_period > NCR_700_MIN_PERIOD)
 750                 hostdata->min_period = min_period;
 751 }
 752
 753 STATIC void
 754 NCR_700_chip_reset(struct Scsi_Host *host)
 755 {
 756         struct NCR_700_Host_Parameters *hostdata =
 757                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 758         if(hostdata->chip710) {
 759                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 760                 udelay(100);
 761
 762                 NCR_700_writeb(0, host, ISTAT_REG);
 763         } else {
 764                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 765                 udelay(100);
 766
 767                 NCR_700_writeb(0, host, DCNTL_REG);
 768         }
 769
 770         mdelay(1000);
 771
 772         NCR_700_chip_setup(host);
 773 }
 774
 775 /* The heart of the message processing engine is that the instruction
 776  * immediately after the INT is the normal case (and so must be CLEAR
 777  * ACK).  If we want to do something else, we call that routine in
 778  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 779  * ACK) so that the routine returns correctly to resume its activity
 780  * */
 781 STATIC __u32
 782 process_extended_message(struct Scsi_Host *host,
 783                          struct NCR_700_Host_Parameters *hostdata,
 784                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 785 {
 786         __u32 resume_offset = dsp, temp = dsp + 8;
 787         __u8 pun = 0xff, lun = 0xff;
 788
 789         if(SCp != NULL) {
 790                 pun = SCp->device->id;
 791                 lun = SCp->device->lun;
 792         }
 793
 794         switch(hostdata->msgin[2]) {
 795         case A_SDTR_MSG:
 796                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 797                         struct scsi_target *starget = SCp->device->sdev_target;
 798                         __u8 period = hostdata->msgin[3];
 799                         __u8 offset = hostdata->msgin[4];
 800
 801                         if(offset == 0 || period == 0) {
 802                                 offset = 0;
 803                                 period = 0;
 804                         }
 805
 806                         spi_offset(starget) = offset;
 807                         spi_period(starget) = period;
 808
 809                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 810                                 spi_display_xfer_agreement(starget);
 811                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 812                         }
 813
 814                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 815                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 816
 817                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 818                                        host, SXFER_REG);
 819
 820                 } else {
 821                         /* SDTR message out of the blue, reject it */
 822                         shost_printk(KERN_WARNING, host,
 823                                 "Unexpected SDTR msg\n");
 824                         hostdata->msgout[0] = A_REJECT_MSG;
 825                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 826                         script_patch_16(hostdata->dev, hostdata->script,
 827                                         MessageCount, 1);
 828                         /* SendMsgOut returns, so set up the return
 829                          * address */
 830                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 831                 }
 832                 break;
 833
 834         case A_WDTR_MSG:
 835                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 836                        host->host_no, pun, lun);
 837                 hostdata->msgout[0] = A_REJECT_MSG;
 838                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 839                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 840                                 1);
 841                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 842
 843                 break;
 844
 845         default:
 846                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 847                        host->host_no, pun, lun,
 848                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 849                 spi_print_msg(hostdata->msgin);
 850                 printk("\n");
 851                 /* just reject it */
 852                 hostdata->msgout[0] = A_REJECT_MSG;
 853                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 854                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 855                                 1);
 856                 /* SendMsgOut returns, so set up the return
 857                  * address */
 858                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 859         }
 860         NCR_700_writel(temp, host, TEMP_REG);
 861         return resume_offset;
 862 }
 863
 864 STATIC __u32
 865 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 866                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 867 {
 868         /* work out where to return to */
 869         __u32 temp = dsp + 8, resume_offset = dsp;
 870         __u8 pun = 0xff, lun = 0xff;
 871
 872         if(SCp != NULL) {
 873                 pun = SCp->device->id;
 874                 lun = SCp->device->lun;
 875         }
 876
 877 #ifdef NCR_700_DEBUG
 878         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 879                NCR_700_phase[(dsps & 0xf00) >> 8]);
 880         spi_print_msg(hostdata->msgin);
 881         printk("\n");
 882 #endif
 883
 884         switch(hostdata->msgin[0]) {
 885
 886         case A_EXTENDED_MSG:
 887                 resume_offset =  process_extended_message(host, hostdata, SCp,
 888                                                           dsp, dsps);
 889                 break;
 890
 891         case A_REJECT_MSG:
 892                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 893                         /* Rejected our sync negotiation attempt */
 894                         spi_period(SCp->device->sdev_target) =
 895                                 spi_offset(SCp->device->sdev_target) = 0;
 896                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 897                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 898                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 899                         /* rejected our first simple tag message */
 900                         scmd_printk(KERN_WARNING, SCp,
 901                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 902                         /* we're done negotiating */
 903                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 904                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 905
 906                         SCp->device->tagged_supported = 0;
 907                         scsi_change_queue_depth(SCp->device, host->cmd_per_lun);
 908                         scsi_set_tag_type(SCp->device, 0);
 909                 } else {
 910                         shost_printk(KERN_WARNING, host,
 911                                 "(%d:%d) Unexpected REJECT Message %s\n",
 912                                pun, lun,
 913                                NCR_700_phase[(dsps & 0xf00) >> 8]);
 914                         /* however, just ignore it */
 915                 }
 916                 break;
 917
 918         case A_PARITY_ERROR_MSG:
 919                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
 920                        pun, lun);
 921                 NCR_700_internal_bus_reset(host);
 922                 break;
 923         case A_SIMPLE_TAG_MSG:
 924                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
 925                        pun, lun, hostdata->msgin[1],
 926                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 927                 /* just ignore it */
 928                 break;
 929         default:
 930                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 931                        host->host_no, pun, lun,
 932                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 933
 934                 spi_print_msg(hostdata->msgin);
 935                 printk("\n");
 936                 /* just reject it */
 937                 hostdata->msgout[0] = A_REJECT_MSG;
 938                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 939                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 940                                 1);
 941                 /* SendMsgOut returns, so set up the return
 942                  * address */
 943                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 944
 945                 break;
 946         }
 947         NCR_700_writel(temp, host, TEMP_REG);
 948         /* set us up to receive another message */
 949         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 950         return resume_offset;
 951 }
 952
 953 STATIC __u32
 954 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 955                          struct Scsi_Host *host,
 956                          struct NCR_700_Host_Parameters *hostdata)
 957 {
 958         __u32 resume_offset = 0;
 959         __u8 pun = 0xff, lun=0xff;
 960
 961         if(SCp != NULL) {
 962                 pun = SCp->device->id;
 963                 lun = SCp->device->lun;
 964         }
 965
 966         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 967                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 968                        hostdata->status[0]));
 969                 /* OK, if TCQ still under negotiation, we now know it works */
 970                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 971                         NCR_700_set_tag_neg_state(SCp->device,
 972                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 973
 974                 /* check for contingent allegiance contitions */
 975                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 976                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 977                         struct NCR_700_command_slot *slot =
 978                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 979                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
 980                                 /* OOPS: bad device, returning another
 981                                  * contingent allegiance condition */
 982                                 scmd_printk(KERN_ERR, SCp,
 983                                         "broken device is looping in contingent allegiance: ignoring\n");
 984                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 985                         } else {
 986                                 char *cmnd =
 987                                         NCR_700_get_sense_cmnd(SCp->device);
 988 #ifdef NCR_DEBUG
 989                                 scsi_print_command(SCp);
 990                                 printk("  cmd %p has status %d, requesting sense\n",
 991                                        SCp, hostdata->status[0]);
 992 #endif
 993                                 /* we can destroy the command here
 994                                  * because the contingent allegiance
 995                                  * condition will cause a retry which
 996                                  * will re-copy the command from the
 997                                  * saved data_cmnd.  We also unmap any
 998                                  * data associated with the command
 999                                  * here */
1000                                 NCR_700_unmap(hostdata, SCp, slot);
1001                                 dma_unmap_single(hostdata->dev, slot->pCmd,
1002                                                  MAX_COMMAND_SIZE,
1003                                                  DMA_TO_DEVICE);
1004
1005                                 cmnd[0] = REQUEST_SENSE;
1006                                 cmnd[1] = (lun & 0x7) << 5;
1007                                 cmnd[2] = 0;
1008                                 cmnd[3] = 0;
1009                                 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1010                                 cmnd[5] = 0;
1011                                 /* Here's a quiet hack: the
1012                                  * REQUEST_SENSE command is six bytes,
1013                                  * so store a flag indicating that
1014                                  * this was an internal sense request
1015                                  * and the original status at the end
1016                                  * of the command */
1017                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1018                                 cmnd[7] = hostdata->status[0];
1019                                 cmnd[8] = SCp->cmd_len;
1020                                 SCp->cmd_len = 6; /* command length for
1021                                                    * REQUEST_SENSE */
1022                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1023                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1024                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1025                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1026                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1027                                 slot->SG[1].pAddr = 0;
1028                                 slot->resume_offset = hostdata->pScript;
1029                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1030                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1031
1032                                 /* queue the command for reissue */
1033                                 slot->state = NCR_700_SLOT_QUEUED;
1034                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1035                                 hostdata->state = NCR_700_HOST_FREE;
1036                                 hostdata->cmd = NULL;
1037                         }
1038                 } else {
1039                         // Currently rely on the mid layer evaluation
1040                         // of the tag queuing capability
1041                         //
1042                         //if(status_byte(hostdata->status[0]) == GOOD &&
1043                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1044                         //      /* Piggy back the tag queueing support
1045                         //       * on this command */
1046                         //      dma_sync_single_for_cpu(hostdata->dev,
1047                         //                          slot->dma_handle,
1048                         //                          SCp->request_bufflen,
1049                         //                          DMA_FROM_DEVICE);
1050                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1051                         //              scmd_printk(KERN_INFO, SCp,
1052                         //                   "Enabling Tag Command Queuing\n");
1053                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1054                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1055                         //      } else {
1056                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1057                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1058                         //      }
1059                         //}
1060                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1061                 }
1062         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1063                 __u8 i = (dsps & 0xf00) >> 8;
1064
1065                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1066                        NCR_700_phase[i],
1067                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1068                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1069                         SCp->cmd_len);
1070                 scsi_print_command(SCp);
1071
1072                 NCR_700_internal_bus_reset(host);
1073         } else if((dsps & 0xfffff000) == A_FATAL) {
1074                 int i = (dsps & 0xfff);
1075
1076                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1077                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1078                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1079                         printk(KERN_ERR "     msg begins %02x %02x\n",
1080                                hostdata->msgin[0], hostdata->msgin[1]);
1081                 }
1082                 NCR_700_internal_bus_reset(host);
1083         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1084 #ifdef NCR_700_DEBUG
1085                 __u8 i = (dsps & 0xf00) >> 8;
1086
1087                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1088                        host->host_no, pun, lun,
1089                        i, NCR_700_phase[i]);
1090 #endif
1091                 save_for_reselection(hostdata, SCp, dsp);
1092
1093         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1094                 __u8 lun;
1095                 struct NCR_700_command_slot *slot;
1096                 __u8 reselection_id = hostdata->reselection_id;
1097                 struct scsi_device *SDp;
1098
1099                 lun = hostdata->msgin[0] & 0x1f;
1100
1101                 hostdata->reselection_id = 0xff;
1102                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1103                        host->host_no, reselection_id, lun));
1104                 /* clear the reselection indicator */
1105                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1106                 if(unlikely(SDp == NULL)) {
1107                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1108                                host->host_no, reselection_id, lun);
1109                         BUG();
1110                 }
1111                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1112                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1113                         if(unlikely(SCp == NULL)) {
1114                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1115                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1116                                 BUG();
1117                         }
1118
1119                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1120                         DDEBUG(KERN_DEBUG, SDp,
1121                                 "reselection is tag %d, slot %p(%d)\n",
1122                                 hostdata->msgin[2], slot, slot->tag);
1123                 } else {
1124                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1125                         if(unlikely(SCp == NULL)) {
1126                                 sdev_printk(KERN_ERR, SDp,
1127                                         "no saved request for untagged cmd\n");
1128                                 BUG();
1129                         }
1130                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1131                 }
1132
1133                 if(slot == NULL) {
1134                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1135                                host->host_no, reselection_id, lun,
1136                                hostdata->msgin[0], hostdata->msgin[1],
1137                                hostdata->msgin[2]);
1138                 } else {
1139                         if(hostdata->state != NCR_700_HOST_BUSY)
1140                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1141                                        host->host_no);
1142                         resume_offset = slot->resume_offset;
1143                         hostdata->cmd = slot->cmnd;
1144
1145                         /* re-patch for this command */
1146                         script_patch_32_abs(hostdata->dev, hostdata->script,
1147                                             CommandAddress, slot->pCmd);
1148                         script_patch_16(hostdata->dev, hostdata->script,
1149                                         CommandCount, slot->cmnd->cmd_len);
1150                         script_patch_32_abs(hostdata->dev, hostdata->script,
1151                                             SGScriptStartAddress,
1152                                             to32bit(&slot->pSG[0].ins));
1153
1154                         /* Note: setting SXFER only works if we're
1155                          * still in the MESSAGE phase, so it is vital
1156                          * that ACK is still asserted when we process
1157                          * the reselection message.  The resume offset
1158                          * should therefore always clear ACK */
1159                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1160                                        host, SXFER_REG);
1161                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1162                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1163                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1164                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1165                         /* I'm just being paranoid here, the command should
1166                          * already have been flushed from the cache */
1167                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1168                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1169
1170
1171
1172                 }
1173         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1174
1175                 /* This section is full of debugging code because I've
1176                  * never managed to reach it.  I think what happens is
1177                  * that, because the 700 runs with selection
1178                  * interrupts enabled the whole time that we take a
1179                  * selection interrupt before we manage to get to the
1180                  * reselected script interrupt */
1181
1182                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1183                 struct NCR_700_command_slot *slot;
1184
1185                 /* Take out our own ID */
1186                 reselection_id &= ~(1<<host->this_id);
1187
1188                 /* I've never seen this happen, so keep this as a printk rather
1189                  * than a debug */
1190                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1191                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1192
1193                 {
1194                         /* FIXME: DEBUGGING CODE */
1195                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1196                         int i;
1197
1198                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1199                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1200                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1201                                         break;
1202                         }
1203                         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);
1204                         SCp =  hostdata->slots[i].cmnd;
1205                 }
1206
1207                 if(SCp != NULL) {
1208                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1209                         /* change slot from busy to queued to redo command */
1210                         slot->state = NCR_700_SLOT_QUEUED;
1211                 }
1212                 hostdata->cmd = NULL;
1213
1214                 if(reselection_id == 0) {
1215                         if(hostdata->reselection_id == 0xff) {
1216                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1217                                 return 0;
1218                         } else {
1219                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1220                                        host->host_no);
1221                                 reselection_id = hostdata->reselection_id;
1222                         }
1223                 } else {
1224
1225                         /* convert to real ID */
1226                         reselection_id = bitmap_to_number(reselection_id);
1227                 }
1228                 hostdata->reselection_id = reselection_id;
1229                 /* just in case we have a stale simple tag message, clear it */
1230                 hostdata->msgin[1] = 0;
1231                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1232                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1233                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1234                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1235                 } else {
1236                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1237                 }
1238         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1239                 /* we've just disconnected from the bus, do nothing since
1240                  * a return here will re-run the queued command slot
1241                  * that may have been interrupted by the initial selection */
1242                 DEBUG((" SELECTION COMPLETED\n"));
1243         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1244                 resume_offset = process_message(host, hostdata, SCp,
1245                                                 dsp, dsps);
1246         } else if((dsps &  0xfffff000) == 0) {
1247                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1248                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1249                        host->host_no, pun, lun, NCR_700_condition[i],
1250                        NCR_700_phase[j], dsp - hostdata->pScript);
1251                 if(SCp != NULL) {
1252                         struct scatterlist *sg;
1253
1254                         scsi_print_command(SCp);
1255                         scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1256                                 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);
1257                         }
1258                 }
1259                 NCR_700_internal_bus_reset(host);
1260         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1261                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1262                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1263                 resume_offset = dsp;
1264         } else {
1265                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1266                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1267                 NCR_700_internal_bus_reset(host);
1268         }
1269         return resume_offset;
1270 }
1271
1272 /* We run the 53c700 with selection interrupts always enabled.  This
1273  * means that the chip may be selected as soon as the bus frees.  On a
1274  * busy bus, this can be before the scripts engine finishes its
1275  * processing.  Therefore, part of the selection processing has to be
1276  * to find out what the scripts engine is doing and complete the
1277  * function if necessary (i.e. process the pending disconnect or save
1278  * the interrupted initial selection */
1279 STATIC inline __u32
1280 process_selection(struct Scsi_Host *host, __u32 dsp)
1281 {
1282         __u8 id = 0;    /* Squash compiler warning */
1283         int count = 0;
1284         __u32 resume_offset = 0;
1285         struct NCR_700_Host_Parameters *hostdata =
1286                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1287         struct scsi_cmnd *SCp = hostdata->cmd;
1288         __u8 sbcl;
1289
1290         for(count = 0; count < 5; count++) {
1291                 id = NCR_700_readb(host, hostdata->chip710 ?
1292                                    CTEST9_REG : SFBR_REG);
1293
1294                 /* Take out our own ID */
1295                 id &= ~(1<<host->this_id);
1296                 if(id != 0)
1297                         break;
1298                 udelay(5);
1299         }
1300         sbcl = NCR_700_readb(host, SBCL_REG);
1301         if((sbcl & SBCL_IO) == 0) {
1302                 /* mark as having been selected rather than reselected */
1303                 id = 0xff;
1304         } else {
1305                 /* convert to real ID */
1306                 hostdata->reselection_id = id = bitmap_to_number(id);
1307                 DEBUG(("scsi%d:  Reselected by %d\n",
1308                        host->host_no, id));
1309         }
1310         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1311                 struct NCR_700_command_slot *slot =
1312                         (struct NCR_700_command_slot *)SCp->host_scribble;
1313                 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));
1314
1315                 switch(dsp - hostdata->pScript) {
1316                 case Ent_Disconnect1:
1317                 case Ent_Disconnect2:
1318                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1319                         break;
1320                 case Ent_Disconnect3:
1321                 case Ent_Disconnect4:
1322                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1323                         break;
1324                 case Ent_Disconnect5:
1325                 case Ent_Disconnect6:
1326                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1327                         break;
1328                 case Ent_Disconnect7:
1329                 case Ent_Disconnect8:
1330                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1331                         break;
1332                 case Ent_Finish1:
1333                 case Ent_Finish2:
1334                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1335                         break;
1336
1337                 default:
1338                         slot->state = NCR_700_SLOT_QUEUED;
1339                         break;
1340                         }
1341         }
1342         hostdata->state = NCR_700_HOST_BUSY;
1343         hostdata->cmd = NULL;
1344         /* clear any stale simple tag message */
1345         hostdata->msgin[1] = 0;
1346         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1347                        DMA_BIDIRECTIONAL);
1348
1349         if(id == 0xff) {
1350                 /* Selected as target, Ignore */
1351                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1352         } else if(hostdata->tag_negotiated & (1<<id)) {
1353                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1354         } else {
1355                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1356         }
1357         return resume_offset;
1358 }
1359
1360 static inline void
1361 NCR_700_clear_fifo(struct Scsi_Host *host) {
1362         const struct NCR_700_Host_Parameters *hostdata
1363                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1364         if(hostdata->chip710) {
1365                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1366         } else {
1367                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1368         }
1369 }
1370
1371 static inline void
1372 NCR_700_flush_fifo(struct Scsi_Host *host) {
1373         const struct NCR_700_Host_Parameters *hostdata
1374                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1375         if(hostdata->chip710) {
1376                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1377                 udelay(10);
1378                 NCR_700_writeb(0, host, CTEST8_REG);
1379         } else {
1380                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1381                 udelay(10);
1382                 NCR_700_writeb(0, host, DFIFO_REG);
1383         }
1384 }
1385
1386
1387 /* The queue lock with interrupts disabled must be held on entry to
1388  * this function */
1389 STATIC int
1390 NCR_700_start_command(struct scsi_cmnd *SCp)
1391 {
1392         struct NCR_700_command_slot *slot =
1393                 (struct NCR_700_command_slot *)SCp->host_scribble;
1394         struct NCR_700_Host_Parameters *hostdata =
1395                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1396         __u16 count = 1;        /* for IDENTIFY message */
1397         u8 lun = SCp->device->lun;
1398
1399         if(hostdata->state != NCR_700_HOST_FREE) {
1400                 /* keep this inside the lock to close the race window where
1401                  * the running command finishes on another CPU while we don't
1402                  * change the state to queued on this one */
1403                 slot->state = NCR_700_SLOT_QUEUED;
1404
1405                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1406                        SCp->device->host->host_no, slot->cmnd, slot));
1407                 return 0;
1408         }
1409         hostdata->state = NCR_700_HOST_BUSY;
1410         hostdata->cmd = SCp;
1411         slot->state = NCR_700_SLOT_BUSY;
1412         /* keep interrupts disabled until we have the command correctly
1413          * set up so we cannot take a selection interrupt */
1414
1415         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1416                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1417                                                lun);
1418         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1419          * if the negotiated transfer parameters still hold, so
1420          * always renegotiate them */
1421         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1422            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1423                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1424         }
1425
1426         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1427          * If a contingent allegiance condition exists, the device
1428          * will refuse all tags, so send the request sense as untagged
1429          * */
1430         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1431            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1432                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1433                 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1434         }
1435
1436         if(hostdata->fast &&
1437            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1438                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1439                                 spi_period(SCp->device->sdev_target),
1440                                 spi_offset(SCp->device->sdev_target));
1441                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1442         }
1443
1444         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1445
1446
1447         script_patch_ID(hostdata->dev, hostdata->script,
1448                         Device_ID, 1<<scmd_id(SCp));
1449
1450         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1451                             slot->pCmd);
1452         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1453                         SCp->cmd_len);
1454         /* finally plumb the beginning of the SG list into the script
1455          * */
1456         script_patch_32_abs(hostdata->dev, hostdata->script,
1457                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1458         NCR_700_clear_fifo(SCp->device->host);
1459
1460         if(slot->resume_offset == 0)
1461                 slot->resume_offset = hostdata->pScript;
1462         /* now perform all the writebacks and invalidates */
1463         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1464         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1465                        DMA_FROM_DEVICE);
1466         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1467         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1468
1469         /* set the synchronous period/offset */
1470         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1471                        SCp->device->host, SXFER_REG);
1472         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1473         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1474
1475         return 1;
1476 }
1477
1478 irqreturn_t
1479 NCR_700_intr(int irq, void *dev_id)
1480 {
1481         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1482         struct NCR_700_Host_Parameters *hostdata =
1483                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1484         __u8 istat;
1485         __u32 resume_offset = 0;
1486         __u8 pun = 0xff, lun = 0xff;
1487         unsigned long flags;
1488         int handled = 0;
1489
1490         /* Use the host lock to serialise access to the 53c700
1491          * hardware.  Note: In future, we may need to take the queue
1492          * lock to enter the done routines.  When that happens, we
1493          * need to ensure that for this driver, the host lock and the
1494          * queue lock point to the same thing. */
1495         spin_lock_irqsave(host->host_lock, flags);
1496         if((istat = NCR_700_readb(host, ISTAT_REG))
1497               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1498                 __u32 dsps;
1499                 __u8 sstat0 = 0, dstat = 0;
1500                 __u32 dsp;
1501                 struct scsi_cmnd *SCp = hostdata->cmd;
1502                 enum NCR_700_Host_State state;
1503
1504                 handled = 1;
1505                 state = hostdata->state;
1506                 SCp = hostdata->cmd;
1507
1508                 if(istat & SCSI_INT_PENDING) {
1509                         udelay(10);
1510
1511                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1512                 }
1513
1514                 if(istat & DMA_INT_PENDING) {
1515                         udelay(10);
1516
1517                         dstat = NCR_700_readb(host, DSTAT_REG);
1518                 }
1519
1520                 dsps = NCR_700_readl(host, DSPS_REG);
1521                 dsp = NCR_700_readl(host, DSP_REG);
1522
1523                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1524                        host->host_no, istat, sstat0, dstat,
1525                        (dsp - (__u32)(hostdata->pScript))/4,
1526                        dsp, dsps));
1527
1528                 if(SCp != NULL) {
1529                         pun = SCp->device->id;
1530                         lun = SCp->device->lun;
1531                 }
1532
1533                 if(sstat0 & SCSI_RESET_DETECTED) {
1534                         struct scsi_device *SDp;
1535                         int i;
1536
1537                         hostdata->state = NCR_700_HOST_BUSY;
1538
1539                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1540                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1541
1542                         scsi_report_bus_reset(host, 0);
1543
1544                         /* clear all the negotiated parameters */
1545                         __shost_for_each_device(SDp, host)
1546                                 NCR_700_clear_flag(SDp, ~0);
1547
1548                         /* clear all the slots and their pending commands */
1549                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1550                                 struct scsi_cmnd *SCp;
1551                                 struct NCR_700_command_slot *slot =
1552                                         &hostdata->slots[i];
1553
1554                                 if(slot->state == NCR_700_SLOT_FREE)
1555                                         continue;
1556
1557                                 SCp = slot->cmnd;
1558                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1559                                        slot, SCp);
1560                                 free_slot(slot, hostdata);
1561                                 SCp->host_scribble = NULL;
1562                                 NCR_700_set_depth(SCp->device, 0);
1563                                 /* NOTE: deadlock potential here: we
1564                                  * rely on mid-layer guarantees that
1565                                  * scsi_done won't try to issue the
1566                                  * command again otherwise we'll
1567                                  * deadlock on the
1568                                  * hostdata->state_lock */
1569                                 SCp->result = DID_RESET << 16;
1570                                 SCp->scsi_done(SCp);
1571                         }
1572                         mdelay(25);
1573                         NCR_700_chip_setup(host);
1574
1575                         hostdata->state = NCR_700_HOST_FREE;
1576                         hostdata->cmd = NULL;
1577                         /* signal back if this was an eh induced reset */
1578                         if(hostdata->eh_complete != NULL)
1579                                 complete(hostdata->eh_complete);
1580                         goto out_unlock;
1581                 } else if(sstat0 & SELECTION_TIMEOUT) {
1582                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1583                                host->host_no, pun, lun));
1584                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1585                 } else if(sstat0 & PHASE_MISMATCH) {
1586                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1587                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1588
1589                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1590                                 /* It wants to reply to some part of
1591                                  * our message */
1592 #ifdef NCR_700_DEBUG
1593                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1594                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1595                                 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)));
1596 #endif
1597                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1598                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1599                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1600                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1601                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1602                                 int residual = NCR_700_data_residual(host);
1603                                 int i;
1604 #ifdef NCR_700_DEBUG
1605                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1606
1607                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1608                                        host->host_no, pun, lun,
1609                                        SGcount, data_transfer);
1610                                 scsi_print_command(SCp);
1611                                 if(residual) {
1612                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1613                                        host->host_no, pun, lun,
1614                                        SGcount, data_transfer, residual);
1615                                 }
1616 #endif
1617                                 data_transfer += residual;
1618
1619                                 if(data_transfer != 0) {
1620                                         int count;
1621                                         __u32 pAddr;
1622
1623                                         SGcount--;
1624
1625                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1626                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1627                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1628                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1629                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1630                                         pAddr += (count - data_transfer);
1631 #ifdef NCR_700_DEBUG
1632                                         if(pAddr != naddr) {
1633                                                 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);
1634                                         }
1635 #endif
1636                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1637                                 }
1638                                 /* set the executed moves to nops */
1639                                 for(i=0; i<SGcount; i++) {
1640                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1641                                         slot->SG[i].pAddr = 0;
1642                                 }
1643                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1644                                 /* and pretend we disconnected after
1645                                  * the command phase */
1646                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1647                                 /* make sure all the data is flushed */
1648                                 NCR_700_flush_fifo(host);
1649                         } else {
1650                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1651                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1652                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1653                                 NCR_700_internal_bus_reset(host);
1654                         }
1655
1656                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1657                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1658                                host->host_no, pun, lun);
1659                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1660                 } else if(sstat0 & PARITY_ERROR) {
1661                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1662                                host->host_no, pun, lun);
1663                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1664                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1665                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1666                                host->host_no, pun, lun));
1667                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1668                 } else if(dstat & (ILGL_INST_DETECTED)) {
1669                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1670                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1671                                host->host_no, pun, lun,
1672                                dsp, dsp - hostdata->pScript);
1673                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1674                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1675                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1676                                host->host_no, pun, lun, dstat);
1677                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1678                 }
1679
1680
1681                 /* NOTE: selection interrupt processing MUST occur
1682                  * after script interrupt processing to correctly cope
1683                  * with the case where we process a disconnect and
1684                  * then get reselected before we process the
1685                  * disconnection */
1686                 if(sstat0 & SELECTED) {
1687                         /* FIXME: It currently takes at least FOUR
1688                          * interrupts to complete a command that
1689                          * disconnects: one for the disconnect, one
1690                          * for the reselection, one to get the
1691                          * reselection data and one to complete the
1692                          * command.  If we guess the reselected
1693                          * command here and prepare it, we only need
1694                          * to get a reselection data interrupt if we
1695                          * guessed wrongly.  Since the interrupt
1696                          * overhead is much greater than the command
1697                          * setup, this would be an efficient
1698                          * optimisation particularly as we probably
1699                          * only have one outstanding command on a
1700                          * target most of the time */
1701
1702                         resume_offset = process_selection(host, dsp);
1703
1704                 }
1705
1706         }
1707
1708         if(resume_offset) {
1709                 if(hostdata->state != NCR_700_HOST_BUSY) {
1710                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1711                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1712                         hostdata->state = NCR_700_HOST_BUSY;
1713                 }
1714
1715                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1716                 NCR_700_clear_fifo(host);
1717                 NCR_700_writel(resume_offset, host, DSP_REG);
1718         }
1719         /* There is probably a technical no-no about this: If we're a
1720          * shared interrupt and we got this interrupt because the
1721          * other device needs servicing not us, we're still going to
1722          * check our queued commands here---of course, there shouldn't
1723          * be any outstanding.... */
1724         if(hostdata->state == NCR_700_HOST_FREE) {
1725                 int i;
1726
1727                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1728                         /* fairness: always run the queue from the last
1729                          * position we left off */
1730                         int j = (i + hostdata->saved_slot_position)
1731                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1732
1733                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1734                                 continue;
1735                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1736                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1737                                        host->host_no, &hostdata->slots[j],
1738                                        hostdata->slots[j].cmnd));
1739                                 hostdata->saved_slot_position = j + 1;
1740                         }
1741
1742                         break;
1743                 }
1744         }
1745  out_unlock:
1746         spin_unlock_irqrestore(host->host_lock, flags);
1747         return IRQ_RETVAL(handled);
1748 }
1749
1750 static int
1751 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1752 {
1753         struct NCR_700_Host_Parameters *hostdata =
1754                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1755         __u32 move_ins;
1756         enum dma_data_direction direction;
1757         struct NCR_700_command_slot *slot;
1758
1759         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1760                 /* We're over our allocation, this should never happen
1761                  * since we report the max allocation to the mid layer */
1762                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1763                 return 1;
1764         }
1765         /* check for untagged commands.  We cannot have any outstanding
1766          * commands if we accept them.  Commands could be untagged because:
1767          *
1768          * - The tag negotiated bitmap is clear
1769          * - The blk layer sent and untagged command
1770          */
1771         if(NCR_700_get_depth(SCp->device) != 0
1772            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1773                || !(SCp->flags & SCMD_TAGGED))) {
1774                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1775                        NCR_700_get_depth(SCp->device));
1776                 return SCSI_MLQUEUE_DEVICE_BUSY;
1777         }
1778         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1779                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1780                        NCR_700_get_depth(SCp->device));
1781                 return SCSI_MLQUEUE_DEVICE_BUSY;
1782         }
1783         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1784
1785         /* begin the command here */
1786         /* no need to check for NULL, test for command_slot_count above
1787          * ensures a slot is free */
1788         slot = find_empty_slot(hostdata);
1789
1790         slot->cmnd = SCp;
1791
1792         SCp->scsi_done = done;
1793         SCp->host_scribble = (unsigned char *)slot;
1794         SCp->SCp.ptr = NULL;
1795         SCp->SCp.buffer = NULL;
1796
1797 #ifdef NCR_700_DEBUG
1798         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1799         scsi_print_command(SCp);
1800 #endif
1801         if ((SCp->flags & SCMD_TAGGED)
1802            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1803            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1804                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1805                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1806                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1807         }
1808
1809         /* here we may have to process an untagged command.  The gate
1810          * above ensures that this will be the only one outstanding,
1811          * so clear the tag negotiated bit.
1812          *
1813          * FIXME: This will royally screw up on multiple LUN devices
1814          * */
1815         if (!(SCp->flags & SCMD_TAGGED)
1816            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1817                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1818                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1819         }
1820
1821         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1822            && scsi_get_tag_type(SCp->device)) {
1823                 slot->tag = SCp->request->tag;
1824                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1825                        slot->tag, slot);
1826         } else {
1827                 slot->tag = SCSI_NO_TAG;
1828                 /* must populate current_cmnd for scsi_find_tag to work */
1829                 SCp->device->current_cmnd = SCp;
1830         }
1831         /* sanity check: some of the commands generated by the mid-layer
1832          * have an eccentric idea of their sc_data_direction */
1833         if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1834            SCp->sc_data_direction != DMA_NONE) {
1835 #ifdef NCR_700_DEBUG
1836                 printk("53c700: Command");
1837                 scsi_print_command(SCp);
1838                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1839 #endif
1840                 SCp->sc_data_direction = DMA_NONE;
1841         }
1842
1843         switch (SCp->cmnd[0]) {
1844         case REQUEST_SENSE:
1845                 /* clear the internal sense magic */
1846                 SCp->cmnd[6] = 0;
1847                 /* fall through */
1848         default:
1849                 /* OK, get it from the command */
1850                 switch(SCp->sc_data_direction) {
1851                 case DMA_BIDIRECTIONAL:
1852                 default:
1853                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1854                         scsi_print_command(SCp);
1855
1856                         move_ins = 0;
1857                         break;
1858                 case DMA_NONE:
1859                         move_ins = 0;
1860                         break;
1861                 case DMA_FROM_DEVICE:
1862                         move_ins = SCRIPT_MOVE_DATA_IN;
1863                         break;
1864                 case DMA_TO_DEVICE:
1865                         move_ins = SCRIPT_MOVE_DATA_OUT;
1866                         break;
1867                 }
1868         }
1869
1870         /* now build the scatter gather list */
1871         direction = SCp->sc_data_direction;
1872         if(move_ins != 0) {
1873                 int i;
1874                 int sg_count;
1875                 dma_addr_t vPtr = 0;
1876                 struct scatterlist *sg;
1877                 __u32 count = 0;
1878
1879                 sg_count = scsi_dma_map(SCp);
1880                 BUG_ON(sg_count < 0);
1881
1882                 scsi_for_each_sg(SCp, sg, sg_count, i) {
1883                         vPtr = sg_dma_address(sg);
1884                         count = sg_dma_len(sg);
1885
1886                         slot->SG[i].ins = bS_to_host(move_ins | count);
1887                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1888                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1889                         slot->SG[i].pAddr = bS_to_host(vPtr);
1890                 }
1891                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1892                 slot->SG[i].pAddr = 0;
1893                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1894                 DEBUG((" SETTING %08lx to %x\n",
1895                        (&slot->pSG[i].ins),
1896                        slot->SG[i].ins));
1897         }
1898         slot->resume_offset = 0;
1899         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1900                                     MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1901         NCR_700_start_command(SCp);
1902         return 0;
1903 }
1904
1905 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1906
1907 STATIC int
1908 NCR_700_abort(struct scsi_cmnd * SCp)
1909 {
1910         struct NCR_700_command_slot *slot;
1911
1912         scmd_printk(KERN_INFO, SCp, "abort command\n");
1913
1914         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1915
1916         if(slot == NULL)
1917                 /* no outstanding command to abort */
1918                 return SUCCESS;
1919         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1920                 /* FIXME: This is because of a problem in the new
1921                  * error handler.  When it is in error recovery, it
1922                  * will send a TUR to a device it thinks may still be
1923                  * showing a problem.  If the TUR isn't responded to,
1924                  * it will abort it and mark the device off line.
1925                  * Unfortunately, it does no other error recovery, so
1926                  * this would leave us with an outstanding command
1927                  * occupying a slot.  Rather than allow this to
1928                  * happen, we issue a bus reset to force all
1929                  * outstanding commands to terminate here. */
1930                 NCR_700_internal_bus_reset(SCp->device->host);
1931                 /* still drop through and return failed */
1932         }
1933         return FAILED;
1934
1935 }
1936
1937 STATIC int
1938 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1939 {
1940         DECLARE_COMPLETION_ONSTACK(complete);
1941         struct NCR_700_Host_Parameters *hostdata =
1942                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1943
1944         scmd_printk(KERN_INFO, SCp,
1945                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1946         scsi_print_command(SCp);
1947
1948         /* In theory, eh_complete should always be null because the
1949          * eh is single threaded, but just in case we're handling a
1950          * reset via sg or something */
1951         spin_lock_irq(SCp->device->host->host_lock);
1952         while (hostdata->eh_complete != NULL) {
1953                 spin_unlock_irq(SCp->device->host->host_lock);
1954                 msleep_interruptible(100);
1955                 spin_lock_irq(SCp->device->host->host_lock);
1956         }
1957
1958         hostdata->eh_complete = &complete;
1959         NCR_700_internal_bus_reset(SCp->device->host);
1960
1961         spin_unlock_irq(SCp->device->host->host_lock);
1962         wait_for_completion(&complete);
1963         spin_lock_irq(SCp->device->host->host_lock);
1964
1965         hostdata->eh_complete = NULL;
1966         /* Revalidate the transport parameters of the failing device */
1967         if(hostdata->fast)
1968                 spi_schedule_dv_device(SCp->device);
1969
1970         spin_unlock_irq(SCp->device->host->host_lock);
1971         return SUCCESS;
1972 }
1973
1974 STATIC int
1975 NCR_700_host_reset(struct scsi_cmnd * SCp)
1976 {
1977         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1978         scsi_print_command(SCp);
1979
1980         spin_lock_irq(SCp->device->host->host_lock);
1981
1982         NCR_700_internal_bus_reset(SCp->device->host);
1983         NCR_700_chip_reset(SCp->device->host);
1984
1985         spin_unlock_irq(SCp->device->host->host_lock);
1986
1987         return SUCCESS;
1988 }
1989
1990 STATIC void
1991 NCR_700_set_period(struct scsi_target *STp, int period)
1992 {
1993         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1994         struct NCR_700_Host_Parameters *hostdata =
1995                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1996
1997         if(!hostdata->fast)
1998                 return;
1999
2000         if(period < hostdata->min_period)
2001                 period = hostdata->min_period;
2002
2003         spi_period(STp) = period;
2004         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2005                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2006         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2007 }
2008
2009 STATIC void
2010 NCR_700_set_offset(struct scsi_target *STp, int offset)
2011 {
2012         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2013         struct NCR_700_Host_Parameters *hostdata =
2014                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2015         int max_offset = hostdata->chip710
2016                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2017
2018         if(!hostdata->fast)
2019                 return;
2020
2021         if(offset > max_offset)
2022                 offset = max_offset;
2023
2024         /* if we're currently async, make sure the period is reasonable */
2025         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2026                                     spi_period(STp) > 0xff))
2027                 spi_period(STp) = hostdata->min_period;
2028
2029         spi_offset(STp) = offset;
2030         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2031                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2032         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2033 }
2034
2035 STATIC int
2036 NCR_700_slave_alloc(struct scsi_device *SDp)
2037 {
2038         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2039                                 GFP_KERNEL);
2040
2041         if (!SDp->hostdata)
2042                 return -ENOMEM;
2043
2044         return 0;
2045 }
2046
2047 STATIC int
2048 NCR_700_slave_configure(struct scsi_device *SDp)
2049 {
2050         struct NCR_700_Host_Parameters *hostdata =
2051                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2052
2053         /* to do here: allocate memory; build a queue_full list */
2054         if(SDp->tagged_supported) {
2055                 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2056                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2057         }
2058
2059         if(hostdata->fast) {
2060                 /* Find the correct offset and period via domain validation */
2061                 if (!spi_initial_dv(SDp->sdev_target))
2062                         spi_dv_device(SDp);
2063         } else {
2064                 spi_offset(SDp->sdev_target) = 0;
2065                 spi_period(SDp->sdev_target) = 0;
2066         }
2067         return 0;
2068 }
2069
2070 STATIC void
2071 NCR_700_slave_destroy(struct scsi_device *SDp)
2072 {
2073         kfree(SDp->hostdata);
2074         SDp->hostdata = NULL;
2075 }
2076
2077 static int
2078 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2079 {
2080         if (depth > NCR_700_MAX_TAGS)
2081                 depth = NCR_700_MAX_TAGS;
2082         return scsi_change_queue_depth(SDp, depth);
2083 }
2084
2085 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2086 {
2087         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2088                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2089         struct NCR_700_Host_Parameters *hostdata =
2090                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2091
2092         /* We have a global (per target) flag to track whether TCQ is
2093          * enabled, so we'll be turning it off for the entire target here.
2094          * our tag algorithm will fail if we mix tagged and untagged commands,
2095          * so quiesce the device before doing this */
2096         if (change_tag)
2097                 scsi_target_quiesce(SDp->sdev_target);
2098
2099         scsi_set_tag_type(SDp, tag_type);
2100         if (!tag_type) {
2101                 /* shift back to the default unqueued number of commands
2102                  * (the user can still raise this) */
2103                 scsi_change_queue_depth(SDp, SDp->host->cmd_per_lun);
2104                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2105         } else {
2106                 /* Here, we cleared the negotiation flag above, so this
2107                  * will force the driver to renegotiate */
2108                 scsi_change_queue_depth(SDp, SDp->queue_depth);
2109                 if (change_tag)
2110                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2111         }
2112         if (change_tag)
2113                 scsi_target_resume(SDp->sdev_target);
2114
2115         return tag_type;
2116 }
2117
2118 static ssize_t
2119 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2120 {
2121         struct scsi_device *SDp = to_scsi_device(dev);
2122
2123         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2124 }
2125
2126 static struct device_attribute NCR_700_active_tags_attr = {
2127         .attr = {
2128                 .name =         "active_tags",
2129                 .mode =         S_IRUGO,
2130         },
2131         .show = NCR_700_show_active_tags,
2132 };
2133
2134 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2135         &NCR_700_active_tags_attr,
2136         NULL,
2137 };
2138
2139 EXPORT_SYMBOL(NCR_700_detect);
2140 EXPORT_SYMBOL(NCR_700_release);
2141 EXPORT_SYMBOL(NCR_700_intr);
2142
2143 static struct spi_function_template NCR_700_transport_functions =  {
2144         .set_period     = NCR_700_set_period,
2145         .show_period    = 1,
2146         .set_offset     = NCR_700_set_offset,
2147         .show_offset    = 1,
2148 };
2149
2150 static int __init NCR_700_init(void)
2151 {
2152         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2153         if(!NCR_700_transport_template)
2154                 return -ENODEV;
2155         return 0;
2156 }
2157
2158 static void __exit NCR_700_exit(void)
2159 {
2160         spi_release_transport(NCR_700_transport_template);
2161 }
2162
2163 module_init(NCR_700_init);
2164 module_exit(NCR_700_exit);
2165