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, int reason);
 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                         SCp->device->tagged_supported = 0;
 906                         scsi_adjust_queue_depth(SCp->device, 0, host->cmd_per_lun);
 907                 } else {
 908                         shost_printk(KERN_WARNING, host,
 909                                 "(%d:%d) Unexpected REJECT Message %s\n",
 910                                pun, lun,
 911                                NCR_700_phase[(dsps & 0xf00) >> 8]);
 912                         /* however, just ignore it */
 913                 }
 914                 break;
 915
 916         case A_PARITY_ERROR_MSG:
 917                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
 918                        pun, lun);
 919                 NCR_700_internal_bus_reset(host);
 920                 break;
 921         case A_SIMPLE_TAG_MSG:
 922                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
 923                        pun, lun, hostdata->msgin[1],
 924                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 925                 /* just ignore it */
 926                 break;
 927         default:
 928                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 929                        host->host_no, pun, lun,
 930                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 931
 932                 spi_print_msg(hostdata->msgin);
 933                 printk("\n");
 934                 /* just reject it */
 935                 hostdata->msgout[0] = A_REJECT_MSG;
 936                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 937                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 938                                 1);
 939                 /* SendMsgOut returns, so set up the return
 940                  * address */
 941                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 942
 943                 break;
 944         }
 945         NCR_700_writel(temp, host, TEMP_REG);
 946         /* set us up to receive another message */
 947         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 948         return resume_offset;
 949 }
 950
 951 STATIC __u32
 952 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 953                          struct Scsi_Host *host,
 954                          struct NCR_700_Host_Parameters *hostdata)
 955 {
 956         __u32 resume_offset = 0;
 957         __u8 pun = 0xff, lun=0xff;
 958
 959         if(SCp != NULL) {
 960                 pun = SCp->device->id;
 961                 lun = SCp->device->lun;
 962         }
 963
 964         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 965                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 966                        hostdata->status[0]));
 967                 /* OK, if TCQ still under negotiation, we now know it works */
 968                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 969                         NCR_700_set_tag_neg_state(SCp->device,
 970                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 971
 972                 /* check for contingent allegiance contitions */
 973                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 974                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 975                         struct NCR_700_command_slot *slot =
 976                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 977                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
 978                                 /* OOPS: bad device, returning another
 979                                  * contingent allegiance condition */
 980                                 scmd_printk(KERN_ERR, SCp,
 981                                         "broken device is looping in contingent allegiance: ignoring\n");
 982                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 983                         } else {
 984                                 char *cmnd =
 985                                         NCR_700_get_sense_cmnd(SCp->device);
 986 #ifdef NCR_DEBUG
 987                                 scsi_print_command(SCp);
 988                                 printk("  cmd %p has status %d, requesting sense\n",
 989                                        SCp, hostdata->status[0]);
 990 #endif
 991                                 /* we can destroy the command here
 992                                  * because the contingent allegiance
 993                                  * condition will cause a retry which
 994                                  * will re-copy the command from the
 995                                  * saved data_cmnd.  We also unmap any
 996                                  * data associated with the command
 997                                  * here */
 998                                 NCR_700_unmap(hostdata, SCp, slot);
 999                                 dma_unmap_single(hostdata->dev, slot->pCmd,
1000                                                  MAX_COMMAND_SIZE,
1001                                                  DMA_TO_DEVICE);
1002
1003                                 cmnd[0] = REQUEST_SENSE;
1004                                 cmnd[1] = (lun & 0x7) << 5;
1005                                 cmnd[2] = 0;
1006                                 cmnd[3] = 0;
1007                                 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1008                                 cmnd[5] = 0;
1009                                 /* Here's a quiet hack: the
1010                                  * REQUEST_SENSE command is six bytes,
1011                                  * so store a flag indicating that
1012                                  * this was an internal sense request
1013                                  * and the original status at the end
1014                                  * of the command */
1015                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1016                                 cmnd[7] = hostdata->status[0];
1017                                 cmnd[8] = SCp->cmd_len;
1018                                 SCp->cmd_len = 6; /* command length for
1019                                                    * REQUEST_SENSE */
1020                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1021                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1022                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1023                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1024                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1025                                 slot->SG[1].pAddr = 0;
1026                                 slot->resume_offset = hostdata->pScript;
1027                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1028                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1029
1030                                 /* queue the command for reissue */
1031                                 slot->state = NCR_700_SLOT_QUEUED;
1032                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1033                                 hostdata->state = NCR_700_HOST_FREE;
1034                                 hostdata->cmd = NULL;
1035                         }
1036                 } else {
1037                         // Currently rely on the mid layer evaluation
1038                         // of the tag queuing capability
1039                         //
1040                         //if(status_byte(hostdata->status[0]) == GOOD &&
1041                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1042                         //      /* Piggy back the tag queueing support
1043                         //       * on this command */
1044                         //      dma_sync_single_for_cpu(hostdata->dev,
1045                         //                          slot->dma_handle,
1046                         //                          SCp->request_bufflen,
1047                         //                          DMA_FROM_DEVICE);
1048                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1049                         //              scmd_printk(KERN_INFO, SCp,
1050                         //                   "Enabling Tag Command Queuing\n");
1051                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1052                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1053                         //      } else {
1054                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1055                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1056                         //      }
1057                         //}
1058                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1059                 }
1060         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1061                 __u8 i = (dsps & 0xf00) >> 8;
1062
1063                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1064                        NCR_700_phase[i],
1065                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1066                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1067                         SCp->cmd_len);
1068                 scsi_print_command(SCp);
1069
1070                 NCR_700_internal_bus_reset(host);
1071         } else if((dsps & 0xfffff000) == A_FATAL) {
1072                 int i = (dsps & 0xfff);
1073
1074                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1075                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1076                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1077                         printk(KERN_ERR "     msg begins %02x %02x\n",
1078                                hostdata->msgin[0], hostdata->msgin[1]);
1079                 }
1080                 NCR_700_internal_bus_reset(host);
1081         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1082 #ifdef NCR_700_DEBUG
1083                 __u8 i = (dsps & 0xf00) >> 8;
1084
1085                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1086                        host->host_no, pun, lun,
1087                        i, NCR_700_phase[i]);
1088 #endif
1089                 save_for_reselection(hostdata, SCp, dsp);
1090
1091         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1092                 __u8 lun;
1093                 struct NCR_700_command_slot *slot;
1094                 __u8 reselection_id = hostdata->reselection_id;
1095                 struct scsi_device *SDp;
1096
1097                 lun = hostdata->msgin[0] & 0x1f;
1098
1099                 hostdata->reselection_id = 0xff;
1100                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1101                        host->host_no, reselection_id, lun));
1102                 /* clear the reselection indicator */
1103                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1104                 if(unlikely(SDp == NULL)) {
1105                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1106                                host->host_no, reselection_id, lun);
1107                         BUG();
1108                 }
1109                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1110                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1111                         if(unlikely(SCp == NULL)) {
1112                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1113                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1114                                 BUG();
1115                         }
1116
1117                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1118                         DDEBUG(KERN_DEBUG, SDp,
1119                                 "reselection is tag %d, slot %p(%d)\n",
1120                                 hostdata->msgin[2], slot, slot->tag);
1121                 } else {
1122                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1123                         if(unlikely(SCp == NULL)) {
1124                                 sdev_printk(KERN_ERR, SDp,
1125                                         "no saved request for untagged cmd\n");
1126                                 BUG();
1127                         }
1128                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1129                 }
1130
1131                 if(slot == NULL) {
1132                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1133                                host->host_no, reselection_id, lun,
1134                                hostdata->msgin[0], hostdata->msgin[1],
1135                                hostdata->msgin[2]);
1136                 } else {
1137                         if(hostdata->state != NCR_700_HOST_BUSY)
1138                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1139                                        host->host_no);
1140                         resume_offset = slot->resume_offset;
1141                         hostdata->cmd = slot->cmnd;
1142
1143                         /* re-patch for this command */
1144                         script_patch_32_abs(hostdata->dev, hostdata->script,
1145                                             CommandAddress, slot->pCmd);
1146                         script_patch_16(hostdata->dev, hostdata->script,
1147                                         CommandCount, slot->cmnd->cmd_len);
1148                         script_patch_32_abs(hostdata->dev, hostdata->script,
1149                                             SGScriptStartAddress,
1150                                             to32bit(&slot->pSG[0].ins));
1151
1152                         /* Note: setting SXFER only works if we're
1153                          * still in the MESSAGE phase, so it is vital
1154                          * that ACK is still asserted when we process
1155                          * the reselection message.  The resume offset
1156                          * should therefore always clear ACK */
1157                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1158                                        host, SXFER_REG);
1159                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1160                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1161                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1162                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1163                         /* I'm just being paranoid here, the command should
1164                          * already have been flushed from the cache */
1165                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1166                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1167
1168
1169
1170                 }
1171         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1172
1173                 /* This section is full of debugging code because I've
1174                  * never managed to reach it.  I think what happens is
1175                  * that, because the 700 runs with selection
1176                  * interrupts enabled the whole time that we take a
1177                  * selection interrupt before we manage to get to the
1178                  * reselected script interrupt */
1179
1180                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1181                 struct NCR_700_command_slot *slot;
1182
1183                 /* Take out our own ID */
1184                 reselection_id &= ~(1<<host->this_id);
1185
1186                 /* I've never seen this happen, so keep this as a printk rather
1187                  * than a debug */
1188                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1189                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1190
1191                 {
1192                         /* FIXME: DEBUGGING CODE */
1193                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1194                         int i;
1195
1196                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1197                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1198                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1199                                         break;
1200                         }
1201                         printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1202                         SCp =  hostdata->slots[i].cmnd;
1203                 }
1204
1205                 if(SCp != NULL) {
1206                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1207                         /* change slot from busy to queued to redo command */
1208                         slot->state = NCR_700_SLOT_QUEUED;
1209                 }
1210                 hostdata->cmd = NULL;
1211
1212                 if(reselection_id == 0) {
1213                         if(hostdata->reselection_id == 0xff) {
1214                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1215                                 return 0;
1216                         } else {
1217                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1218                                        host->host_no);
1219                                 reselection_id = hostdata->reselection_id;
1220                         }
1221                 } else {
1222
1223                         /* convert to real ID */
1224                         reselection_id = bitmap_to_number(reselection_id);
1225                 }
1226                 hostdata->reselection_id = reselection_id;
1227                 /* just in case we have a stale simple tag message, clear it */
1228                 hostdata->msgin[1] = 0;
1229                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1230                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1231                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1232                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1233                 } else {
1234                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1235                 }
1236         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1237                 /* we've just disconnected from the bus, do nothing since
1238                  * a return here will re-run the queued command slot
1239                  * that may have been interrupted by the initial selection */
1240                 DEBUG((" SELECTION COMPLETED\n"));
1241         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1242                 resume_offset = process_message(host, hostdata, SCp,
1243                                                 dsp, dsps);
1244         } else if((dsps &  0xfffff000) == 0) {
1245                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1246                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1247                        host->host_no, pun, lun, NCR_700_condition[i],
1248                        NCR_700_phase[j], dsp - hostdata->pScript);
1249                 if(SCp != NULL) {
1250                         struct scatterlist *sg;
1251
1252                         scsi_print_command(SCp);
1253                         scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1254                                 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1255                         }
1256                 }
1257                 NCR_700_internal_bus_reset(host);
1258         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1259                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1260                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1261                 resume_offset = dsp;
1262         } else {
1263                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1264                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1265                 NCR_700_internal_bus_reset(host);
1266         }
1267         return resume_offset;
1268 }
1269
1270 /* We run the 53c700 with selection interrupts always enabled.  This
1271  * means that the chip may be selected as soon as the bus frees.  On a
1272  * busy bus, this can be before the scripts engine finishes its
1273  * processing.  Therefore, part of the selection processing has to be
1274  * to find out what the scripts engine is doing and complete the
1275  * function if necessary (i.e. process the pending disconnect or save
1276  * the interrupted initial selection */
1277 STATIC inline __u32
1278 process_selection(struct Scsi_Host *host, __u32 dsp)
1279 {
1280         __u8 id = 0;    /* Squash compiler warning */
1281         int count = 0;
1282         __u32 resume_offset = 0;
1283         struct NCR_700_Host_Parameters *hostdata =
1284                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1285         struct scsi_cmnd *SCp = hostdata->cmd;
1286         __u8 sbcl;
1287
1288         for(count = 0; count < 5; count++) {
1289                 id = NCR_700_readb(host, hostdata->chip710 ?
1290                                    CTEST9_REG : SFBR_REG);
1291
1292                 /* Take out our own ID */
1293                 id &= ~(1<<host->this_id);
1294                 if(id != 0)
1295                         break;
1296                 udelay(5);
1297         }
1298         sbcl = NCR_700_readb(host, SBCL_REG);
1299         if((sbcl & SBCL_IO) == 0) {
1300                 /* mark as having been selected rather than reselected */
1301                 id = 0xff;
1302         } else {
1303                 /* convert to real ID */
1304                 hostdata->reselection_id = id = bitmap_to_number(id);
1305                 DEBUG(("scsi%d:  Reselected by %d\n",
1306                        host->host_no, id));
1307         }
1308         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1309                 struct NCR_700_command_slot *slot =
1310                         (struct NCR_700_command_slot *)SCp->host_scribble;
1311                 DEBUG(("  ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1312
1313                 switch(dsp - hostdata->pScript) {
1314                 case Ent_Disconnect1:
1315                 case Ent_Disconnect2:
1316                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1317                         break;
1318                 case Ent_Disconnect3:
1319                 case Ent_Disconnect4:
1320                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1321                         break;
1322                 case Ent_Disconnect5:
1323                 case Ent_Disconnect6:
1324                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1325                         break;
1326                 case Ent_Disconnect7:
1327                 case Ent_Disconnect8:
1328                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1329                         break;
1330                 case Ent_Finish1:
1331                 case Ent_Finish2:
1332                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1333                         break;
1334
1335                 default:
1336                         slot->state = NCR_700_SLOT_QUEUED;
1337                         break;
1338                         }
1339         }
1340         hostdata->state = NCR_700_HOST_BUSY;
1341         hostdata->cmd = NULL;
1342         /* clear any stale simple tag message */
1343         hostdata->msgin[1] = 0;
1344         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1345                        DMA_BIDIRECTIONAL);
1346
1347         if(id == 0xff) {
1348                 /* Selected as target, Ignore */
1349                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1350         } else if(hostdata->tag_negotiated & (1<<id)) {
1351                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1352         } else {
1353                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1354         }
1355         return resume_offset;
1356 }
1357
1358 static inline void
1359 NCR_700_clear_fifo(struct Scsi_Host *host) {
1360         const struct NCR_700_Host_Parameters *hostdata
1361                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1362         if(hostdata->chip710) {
1363                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1364         } else {
1365                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1366         }
1367 }
1368
1369 static inline void
1370 NCR_700_flush_fifo(struct Scsi_Host *host) {
1371         const struct NCR_700_Host_Parameters *hostdata
1372                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1373         if(hostdata->chip710) {
1374                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1375                 udelay(10);
1376                 NCR_700_writeb(0, host, CTEST8_REG);
1377         } else {
1378                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1379                 udelay(10);
1380                 NCR_700_writeb(0, host, DFIFO_REG);
1381         }
1382 }
1383
1384
1385 /* The queue lock with interrupts disabled must be held on entry to
1386  * this function */
1387 STATIC int
1388 NCR_700_start_command(struct scsi_cmnd *SCp)
1389 {
1390         struct NCR_700_command_slot *slot =
1391                 (struct NCR_700_command_slot *)SCp->host_scribble;
1392         struct NCR_700_Host_Parameters *hostdata =
1393                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1394         __u16 count = 1;        /* for IDENTIFY message */
1395         u8 lun = SCp->device->lun;
1396
1397         if(hostdata->state != NCR_700_HOST_FREE) {
1398                 /* keep this inside the lock to close the race window where
1399                  * the running command finishes on another CPU while we don't
1400                  * change the state to queued on this one */
1401                 slot->state = NCR_700_SLOT_QUEUED;
1402
1403                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1404                        SCp->device->host->host_no, slot->cmnd, slot));
1405                 return 0;
1406         }
1407         hostdata->state = NCR_700_HOST_BUSY;
1408         hostdata->cmd = SCp;
1409         slot->state = NCR_700_SLOT_BUSY;
1410         /* keep interrupts disabled until we have the command correctly
1411          * set up so we cannot take a selection interrupt */
1412
1413         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1414                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1415                                                lun);
1416         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1417          * if the negotiated transfer parameters still hold, so
1418          * always renegotiate them */
1419         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1420            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1421                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1422         }
1423
1424         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1425          * If a contingent allegiance condition exists, the device
1426          * will refuse all tags, so send the request sense as untagged
1427          * */
1428         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1429            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1430                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1431                 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1432         }
1433
1434         if(hostdata->fast &&
1435            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1436                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1437                                 spi_period(SCp->device->sdev_target),
1438                                 spi_offset(SCp->device->sdev_target));
1439                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1440         }
1441
1442         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1443
1444
1445         script_patch_ID(hostdata->dev, hostdata->script,
1446                         Device_ID, 1<<scmd_id(SCp));
1447
1448         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1449                             slot->pCmd);
1450         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1451                         SCp->cmd_len);
1452         /* finally plumb the beginning of the SG list into the script
1453          * */
1454         script_patch_32_abs(hostdata->dev, hostdata->script,
1455                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1456         NCR_700_clear_fifo(SCp->device->host);
1457
1458         if(slot->resume_offset == 0)
1459                 slot->resume_offset = hostdata->pScript;
1460         /* now perform all the writebacks and invalidates */
1461         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1462         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1463                        DMA_FROM_DEVICE);
1464         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1465         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1466
1467         /* set the synchronous period/offset */
1468         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1469                        SCp->device->host, SXFER_REG);
1470         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1471         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1472
1473         return 1;
1474 }
1475
1476 irqreturn_t
1477 NCR_700_intr(int irq, void *dev_id)
1478 {
1479         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1480         struct NCR_700_Host_Parameters *hostdata =
1481                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1482         __u8 istat;
1483         __u32 resume_offset = 0;
1484         __u8 pun = 0xff, lun = 0xff;
1485         unsigned long flags;
1486         int handled = 0;
1487
1488         /* Use the host lock to serialise access to the 53c700
1489          * hardware.  Note: In future, we may need to take the queue
1490          * lock to enter the done routines.  When that happens, we
1491          * need to ensure that for this driver, the host lock and the
1492          * queue lock point to the same thing. */
1493         spin_lock_irqsave(host->host_lock, flags);
1494         if((istat = NCR_700_readb(host, ISTAT_REG))
1495               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1496                 __u32 dsps;
1497                 __u8 sstat0 = 0, dstat = 0;
1498                 __u32 dsp;
1499                 struct scsi_cmnd *SCp = hostdata->cmd;
1500                 enum NCR_700_Host_State state;
1501
1502                 handled = 1;
1503                 state = hostdata->state;
1504                 SCp = hostdata->cmd;
1505
1506                 if(istat & SCSI_INT_PENDING) {
1507                         udelay(10);
1508
1509                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1510                 }
1511
1512                 if(istat & DMA_INT_PENDING) {
1513                         udelay(10);
1514
1515                         dstat = NCR_700_readb(host, DSTAT_REG);
1516                 }
1517
1518                 dsps = NCR_700_readl(host, DSPS_REG);
1519                 dsp = NCR_700_readl(host, DSP_REG);
1520
1521                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1522                        host->host_no, istat, sstat0, dstat,
1523                        (dsp - (__u32)(hostdata->pScript))/4,
1524                        dsp, dsps));
1525
1526                 if(SCp != NULL) {
1527                         pun = SCp->device->id;
1528                         lun = SCp->device->lun;
1529                 }
1530
1531                 if(sstat0 & SCSI_RESET_DETECTED) {
1532                         struct scsi_device *SDp;
1533                         int i;
1534
1535                         hostdata->state = NCR_700_HOST_BUSY;
1536
1537                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1538                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1539
1540                         scsi_report_bus_reset(host, 0);
1541
1542                         /* clear all the negotiated parameters */
1543                         __shost_for_each_device(SDp, host)
1544                                 NCR_700_clear_flag(SDp, ~0);
1545
1546                         /* clear all the slots and their pending commands */
1547                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1548                                 struct scsi_cmnd *SCp;
1549                                 struct NCR_700_command_slot *slot =
1550                                         &hostdata->slots[i];
1551
1552                                 if(slot->state == NCR_700_SLOT_FREE)
1553                                         continue;
1554
1555                                 SCp = slot->cmnd;
1556                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1557                                        slot, SCp);
1558                                 free_slot(slot, hostdata);
1559                                 SCp->host_scribble = NULL;
1560                                 NCR_700_set_depth(SCp->device, 0);
1561                                 /* NOTE: deadlock potential here: we
1562                                  * rely on mid-layer guarantees that
1563                                  * scsi_done won't try to issue the
1564                                  * command again otherwise we'll
1565                                  * deadlock on the
1566                                  * hostdata->state_lock */
1567                                 SCp->result = DID_RESET << 16;
1568                                 SCp->scsi_done(SCp);
1569                         }
1570                         mdelay(25);
1571                         NCR_700_chip_setup(host);
1572
1573                         hostdata->state = NCR_700_HOST_FREE;
1574                         hostdata->cmd = NULL;
1575                         /* signal back if this was an eh induced reset */
1576                         if(hostdata->eh_complete != NULL)
1577                                 complete(hostdata->eh_complete);
1578                         goto out_unlock;
1579                 } else if(sstat0 & SELECTION_TIMEOUT) {
1580                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1581                                host->host_no, pun, lun));
1582                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1583                 } else if(sstat0 & PHASE_MISMATCH) {
1584                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1585                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1586
1587                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1588                                 /* It wants to reply to some part of
1589                                  * our message */
1590 #ifdef NCR_700_DEBUG
1591                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1592                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1593                                 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1594 #endif
1595                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1596                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1597                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1598                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1599                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1600                                 int residual = NCR_700_data_residual(host);
1601                                 int i;
1602 #ifdef NCR_700_DEBUG
1603                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1604
1605                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1606                                        host->host_no, pun, lun,
1607                                        SGcount, data_transfer);
1608                                 scsi_print_command(SCp);
1609                                 if(residual) {
1610                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1611                                        host->host_no, pun, lun,
1612                                        SGcount, data_transfer, residual);
1613                                 }
1614 #endif
1615                                 data_transfer += residual;
1616
1617                                 if(data_transfer != 0) {
1618                                         int count;
1619                                         __u32 pAddr;
1620
1621                                         SGcount--;
1622
1623                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1624                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1625                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1626                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1627                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1628                                         pAddr += (count - data_transfer);
1629 #ifdef NCR_700_DEBUG
1630                                         if(pAddr != naddr) {
1631                                                 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1632                                         }
1633 #endif
1634                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1635                                 }
1636                                 /* set the executed moves to nops */
1637                                 for(i=0; i<SGcount; i++) {
1638                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1639                                         slot->SG[i].pAddr = 0;
1640                                 }
1641                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1642                                 /* and pretend we disconnected after
1643                                  * the command phase */
1644                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1645                                 /* make sure all the data is flushed */
1646                                 NCR_700_flush_fifo(host);
1647                         } else {
1648                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1649                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1650                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1651                                 NCR_700_internal_bus_reset(host);
1652                         }
1653
1654                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1655                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1656                                host->host_no, pun, lun);
1657                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1658                 } else if(sstat0 & PARITY_ERROR) {
1659                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1660                                host->host_no, pun, lun);
1661                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1663                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1664                                host->host_no, pun, lun));
1665                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1666                 } else if(dstat & (ILGL_INST_DETECTED)) {
1667                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1668                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1669                                host->host_no, pun, lun,
1670                                dsp, dsp - hostdata->pScript);
1671                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1672                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1673                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1674                                host->host_no, pun, lun, dstat);
1675                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1676                 }
1677
1678
1679                 /* NOTE: selection interrupt processing MUST occur
1680                  * after script interrupt processing to correctly cope
1681                  * with the case where we process a disconnect and
1682                  * then get reselected before we process the
1683                  * disconnection */
1684                 if(sstat0 & SELECTED) {
1685                         /* FIXME: It currently takes at least FOUR
1686                          * interrupts to complete a command that
1687                          * disconnects: one for the disconnect, one
1688                          * for the reselection, one to get the
1689                          * reselection data and one to complete the
1690                          * command.  If we guess the reselected
1691                          * command here and prepare it, we only need
1692                          * to get a reselection data interrupt if we
1693                          * guessed wrongly.  Since the interrupt
1694                          * overhead is much greater than the command
1695                          * setup, this would be an efficient
1696                          * optimisation particularly as we probably
1697                          * only have one outstanding command on a
1698                          * target most of the time */
1699
1700                         resume_offset = process_selection(host, dsp);
1701
1702                 }
1703
1704         }
1705
1706         if(resume_offset) {
1707                 if(hostdata->state != NCR_700_HOST_BUSY) {
1708                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1709                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1710                         hostdata->state = NCR_700_HOST_BUSY;
1711                 }
1712
1713                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1714                 NCR_700_clear_fifo(host);
1715                 NCR_700_writel(resume_offset, host, DSP_REG);
1716         }
1717         /* There is probably a technical no-no about this: If we're a
1718          * shared interrupt and we got this interrupt because the
1719          * other device needs servicing not us, we're still going to
1720          * check our queued commands here---of course, there shouldn't
1721          * be any outstanding.... */
1722         if(hostdata->state == NCR_700_HOST_FREE) {
1723                 int i;
1724
1725                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1726                         /* fairness: always run the queue from the last
1727                          * position we left off */
1728                         int j = (i + hostdata->saved_slot_position)
1729                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1730
1731                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1732                                 continue;
1733                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1734                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1735                                        host->host_no, &hostdata->slots[j],
1736                                        hostdata->slots[j].cmnd));
1737                                 hostdata->saved_slot_position = j + 1;
1738                         }
1739
1740                         break;
1741                 }
1742         }
1743  out_unlock:
1744         spin_unlock_irqrestore(host->host_lock, flags);
1745         return IRQ_RETVAL(handled);
1746 }
1747
1748 static int
1749 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1750 {
1751         struct NCR_700_Host_Parameters *hostdata =
1752                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1753         __u32 move_ins;
1754         enum dma_data_direction direction;
1755         struct NCR_700_command_slot *slot;
1756
1757         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1758                 /* We're over our allocation, this should never happen
1759                  * since we report the max allocation to the mid layer */
1760                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1761                 return 1;
1762         }
1763         /* check for untagged commands.  We cannot have any outstanding
1764          * commands if we accept them.  Commands could be untagged because:
1765          *
1766          * - The tag negotiated bitmap is clear
1767          * - The blk layer sent and untagged command
1768          */
1769         if(NCR_700_get_depth(SCp->device) != 0
1770            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1771                || !(SCp->flags & SCMD_TAGGED))) {
1772                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1773                        NCR_700_get_depth(SCp->device));
1774                 return SCSI_MLQUEUE_DEVICE_BUSY;
1775         }
1776         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1777                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1778                        NCR_700_get_depth(SCp->device));
1779                 return SCSI_MLQUEUE_DEVICE_BUSY;
1780         }
1781         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1782
1783         /* begin the command here */
1784         /* no need to check for NULL, test for command_slot_count above
1785          * ensures a slot is free */
1786         slot = find_empty_slot(hostdata);
1787
1788         slot->cmnd = SCp;
1789
1790         SCp->scsi_done = done;
1791         SCp->host_scribble = (unsigned char *)slot;
1792         SCp->SCp.ptr = NULL;
1793         SCp->SCp.buffer = NULL;
1794
1795 #ifdef NCR_700_DEBUG
1796         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1797         scsi_print_command(SCp);
1798 #endif
1799         if ((SCp->flags & SCMD_TAGGED)
1800            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1801            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1802                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1803                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1804                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1805         }
1806
1807         /* here we may have to process an untagged command.  The gate
1808          * above ensures that this will be the only one outstanding,
1809          * so clear the tag negotiated bit.
1810          *
1811          * FIXME: This will royally screw up on multiple LUN devices
1812          * */
1813         if (!(SCp->flags & SCMD_TAGGED)
1814            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1815                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1816                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1817         }
1818
1819         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1820            && scsi_get_tag_type(SCp->device)) {
1821                 slot->tag = SCp->request->tag;
1822                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1823                        slot->tag, slot);
1824         } else {
1825                 slot->tag = SCSI_NO_TAG;
1826                 /* must populate current_cmnd for scsi_find_tag to work */
1827                 SCp->device->current_cmnd = SCp;
1828         }
1829         /* sanity check: some of the commands generated by the mid-layer
1830          * have an eccentric idea of their sc_data_direction */
1831         if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1832            SCp->sc_data_direction != DMA_NONE) {
1833 #ifdef NCR_700_DEBUG
1834                 printk("53c700: Command");
1835                 scsi_print_command(SCp);
1836                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1837 #endif
1838                 SCp->sc_data_direction = DMA_NONE;
1839         }
1840
1841         switch (SCp->cmnd[0]) {
1842         case REQUEST_SENSE:
1843                 /* clear the internal sense magic */
1844                 SCp->cmnd[6] = 0;
1845                 /* fall through */
1846         default:
1847                 /* OK, get it from the command */
1848                 switch(SCp->sc_data_direction) {
1849                 case DMA_BIDIRECTIONAL:
1850                 default:
1851                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1852                         scsi_print_command(SCp);
1853
1854                         move_ins = 0;
1855                         break;
1856                 case DMA_NONE:
1857                         move_ins = 0;
1858                         break;
1859                 case DMA_FROM_DEVICE:
1860                         move_ins = SCRIPT_MOVE_DATA_IN;
1861                         break;
1862                 case DMA_TO_DEVICE:
1863                         move_ins = SCRIPT_MOVE_DATA_OUT;
1864                         break;
1865                 }
1866         }
1867
1868         /* now build the scatter gather list */
1869         direction = SCp->sc_data_direction;
1870         if(move_ins != 0) {
1871                 int i;
1872                 int sg_count;
1873                 dma_addr_t vPtr = 0;
1874                 struct scatterlist *sg;
1875                 __u32 count = 0;
1876
1877                 sg_count = scsi_dma_map(SCp);
1878                 BUG_ON(sg_count < 0);
1879
1880                 scsi_for_each_sg(SCp, sg, sg_count, i) {
1881                         vPtr = sg_dma_address(sg);
1882                         count = sg_dma_len(sg);
1883
1884                         slot->SG[i].ins = bS_to_host(move_ins | count);
1885                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1886                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1887                         slot->SG[i].pAddr = bS_to_host(vPtr);
1888                 }
1889                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1890                 slot->SG[i].pAddr = 0;
1891                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1892                 DEBUG((" SETTING %08lx to %x\n",
1893                        (&slot->pSG[i].ins),
1894                        slot->SG[i].ins));
1895         }
1896         slot->resume_offset = 0;
1897         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1898                                     MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1899         NCR_700_start_command(SCp);
1900         return 0;
1901 }
1902
1903 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1904
1905 STATIC int
1906 NCR_700_abort(struct scsi_cmnd * SCp)
1907 {
1908         struct NCR_700_command_slot *slot;
1909
1910         scmd_printk(KERN_INFO, SCp, "abort command\n");
1911
1912         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1913
1914         if(slot == NULL)
1915                 /* no outstanding command to abort */
1916                 return SUCCESS;
1917         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1918                 /* FIXME: This is because of a problem in the new
1919                  * error handler.  When it is in error recovery, it
1920                  * will send a TUR to a device it thinks may still be
1921                  * showing a problem.  If the TUR isn't responded to,
1922                  * it will abort it and mark the device off line.
1923                  * Unfortunately, it does no other error recovery, so
1924                  * this would leave us with an outstanding command
1925                  * occupying a slot.  Rather than allow this to
1926                  * happen, we issue a bus reset to force all
1927                  * outstanding commands to terminate here. */
1928                 NCR_700_internal_bus_reset(SCp->device->host);
1929                 /* still drop through and return failed */
1930         }
1931         return FAILED;
1932
1933 }
1934
1935 STATIC int
1936 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1937 {
1938         DECLARE_COMPLETION_ONSTACK(complete);
1939         struct NCR_700_Host_Parameters *hostdata =
1940                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1941
1942         scmd_printk(KERN_INFO, SCp,
1943                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1944         scsi_print_command(SCp);
1945
1946         /* In theory, eh_complete should always be null because the
1947          * eh is single threaded, but just in case we're handling a
1948          * reset via sg or something */
1949         spin_lock_irq(SCp->device->host->host_lock);
1950         while (hostdata->eh_complete != NULL) {
1951                 spin_unlock_irq(SCp->device->host->host_lock);
1952                 msleep_interruptible(100);
1953                 spin_lock_irq(SCp->device->host->host_lock);
1954         }
1955
1956         hostdata->eh_complete = &complete;
1957         NCR_700_internal_bus_reset(SCp->device->host);
1958
1959         spin_unlock_irq(SCp->device->host->host_lock);
1960         wait_for_completion(&complete);
1961         spin_lock_irq(SCp->device->host->host_lock);
1962
1963         hostdata->eh_complete = NULL;
1964         /* Revalidate the transport parameters of the failing device */
1965         if(hostdata->fast)
1966                 spi_schedule_dv_device(SCp->device);
1967
1968         spin_unlock_irq(SCp->device->host->host_lock);
1969         return SUCCESS;
1970 }
1971
1972 STATIC int
1973 NCR_700_host_reset(struct scsi_cmnd * SCp)
1974 {
1975         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1976         scsi_print_command(SCp);
1977
1978         spin_lock_irq(SCp->device->host->host_lock);
1979
1980         NCR_700_internal_bus_reset(SCp->device->host);
1981         NCR_700_chip_reset(SCp->device->host);
1982
1983         spin_unlock_irq(SCp->device->host->host_lock);
1984
1985         return SUCCESS;
1986 }
1987
1988 STATIC void
1989 NCR_700_set_period(struct scsi_target *STp, int period)
1990 {
1991         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1992         struct NCR_700_Host_Parameters *hostdata =
1993                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1994
1995         if(!hostdata->fast)
1996                 return;
1997
1998         if(period < hostdata->min_period)
1999                 period = hostdata->min_period;
2000
2001         spi_period(STp) = period;
2002         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2003                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2004         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2005 }
2006
2007 STATIC void
2008 NCR_700_set_offset(struct scsi_target *STp, int offset)
2009 {
2010         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2011         struct NCR_700_Host_Parameters *hostdata =
2012                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2013         int max_offset = hostdata->chip710
2014                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2015
2016         if(!hostdata->fast)
2017                 return;
2018
2019         if(offset > max_offset)
2020                 offset = max_offset;
2021
2022         /* if we're currently async, make sure the period is reasonable */
2023         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2024                                     spi_period(STp) > 0xff))
2025                 spi_period(STp) = hostdata->min_period;
2026
2027         spi_offset(STp) = offset;
2028         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2029                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2030         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2031 }
2032
2033 STATIC int
2034 NCR_700_slave_alloc(struct scsi_device *SDp)
2035 {
2036         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2037                                 GFP_KERNEL);
2038
2039         if (!SDp->hostdata)
2040                 return -ENOMEM;
2041
2042         return 0;
2043 }
2044
2045 STATIC int
2046 NCR_700_slave_configure(struct scsi_device *SDp)
2047 {
2048         struct NCR_700_Host_Parameters *hostdata =
2049                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2050
2051         /* to do here: allocate memory; build a queue_full list */
2052         if(SDp->tagged_supported) {
2053                 scsi_adjust_queue_depth(SDp, MSG_ORDERED_TAG, NCR_700_DEFAULT_TAGS);
2054                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2055         } else {
2056                 /* initialise to default depth */
2057                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
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, int reason)
2079 {
2080         if (reason != SCSI_QDEPTH_DEFAULT)
2081                 return -EOPNOTSUPP;
2082
2083         if (depth > NCR_700_MAX_TAGS)
2084                 depth = NCR_700_MAX_TAGS;
2085
2086         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2087         return depth;
2088 }
2089
2090 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2091 {
2092         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2093                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2094         struct NCR_700_Host_Parameters *hostdata =
2095                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2096
2097         /* We have a global (per target) flag to track whether TCQ is
2098          * enabled, so we'll be turning it off for the entire target here.
2099          * our tag algorithm will fail if we mix tagged and untagged commands,
2100          * so quiesce the device before doing this */
2101         if (change_tag)
2102                 scsi_target_quiesce(SDp->sdev_target);
2103
2104         if (!tag_type) {
2105                 /* shift back to the default unqueued number of commands
2106                  * (the user can still raise this) */
2107                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2108                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2109         } else {
2110                 /* Here, we cleared the negotiation flag above, so this
2111                  * will force the driver to renegotiate */
2112                 scsi_adjust_queue_depth(SDp, tag_type, SDp->queue_depth);
2113                 if (change_tag)
2114                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2115         }
2116         if (change_tag)
2117                 scsi_target_resume(SDp->sdev_target);
2118
2119         return tag_type;
2120 }
2121
2122 static ssize_t
2123 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2124 {
2125         struct scsi_device *SDp = to_scsi_device(dev);
2126
2127         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2128 }
2129
2130 static struct device_attribute NCR_700_active_tags_attr = {
2131         .attr = {
2132                 .name =         "active_tags",
2133                 .mode =         S_IRUGO,
2134         },
2135         .show = NCR_700_show_active_tags,
2136 };
2137
2138 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2139         &NCR_700_active_tags_attr,
2140         NULL,
2141 };
2142
2143 EXPORT_SYMBOL(NCR_700_detect);
2144 EXPORT_SYMBOL(NCR_700_release);
2145 EXPORT_SYMBOL(NCR_700_intr);
2146
2147 static struct spi_function_template NCR_700_transport_functions =  {
2148         .set_period     = NCR_700_set_period,
2149         .show_period    = 1,
2150         .set_offset     = NCR_700_set_offset,
2151         .show_offset    = 1,
2152 };
2153
2154 static int __init NCR_700_init(void)
2155 {
2156         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2157         if(!NCR_700_transport_template)
2158                 return -ENODEV;
2159         return 0;
2160 }
2161
2162 static void __exit NCR_700_exit(void)
2163 {
2164         spi_release_transport(NCR_700_transport_template);
2165 }
2166
2167 module_init(NCR_700_init);
2168 module_exit(NCR_700_exit);
2169