kernel/drivers/scsi/53c700.c

   1 /* -*- mode: c; c-basic-offset: 8 -*- */
   2
   3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
   4  *
   5  * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
   6 **-----------------------------------------------------------------------------
   7 **
   8 **  This program is free software; you can redistribute it and/or modify
   9 **  it under the terms of the GNU General Public License as published by
  10 **  the Free Software Foundation; either version 2 of the License, or
  11 **  (at your option) any later version.
  12 **
  13 **  This program is distributed in the hope that it will be useful,
  14 **  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 **  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 **  GNU General Public License for more details.
  17 **
  18 **  You should have received a copy of the GNU General Public License
  19 **  along with this program; if not, write to the Free Software
  20 **  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 **
  22 **-----------------------------------------------------------------------------
  23  */
  24
  25 /* Notes:
  26  *
  27  * This driver is designed exclusively for these chips (virtually the
  28  * earliest of the scripts engine chips).  They need their own drivers
  29  * because they are missing so many of the scripts and snazzy register
  30  * features of their elder brothers (the 710, 720 and 770).
  31  *
  32  * The 700 is the lowliest of the line, it can only do async SCSI.
  33  * The 700-66 can at least do synchronous SCSI up to 10MHz.
  34  *
  35  * The 700 chip has no host bus interface logic of its own.  However,
  36  * it is usually mapped to a location with well defined register
  37  * offsets.  Therefore, if you can determine the base address and the
  38  * irq your board incorporating this chip uses, you can probably use
  39  * this driver to run it (although you'll probably have to write a
  40  * minimal wrapper for the purpose---see the NCR_D700 driver for
  41  * details about how to do this).
  42  *
  43  *
  44  * TODO List:
  45  *
  46  * 1. Better statistics in the proc fs
  47  *
  48  * 2. Implement message queue (queues SCSI messages like commands) and make
  49  *    the abort and device reset functions use them.
  50  * */
  51
  52 /* CHANGELOG
  53  *
  54  * Version 2.8
  55  *
  56  * Fixed bad bug affecting tag starvation processing (previously the
  57  * driver would hang the system if too many tags starved.  Also fixed
  58  * bad bug having to do with 10 byte command processing and REQUEST
  59  * SENSE (the command would loop forever getting a transfer length
  60  * mismatch in the CMD phase).
  61  *
  62  * Version 2.7
  63  *
  64  * Fixed scripts problem which caused certain devices (notably CDRWs)
  65  * to hang on initial INQUIRY.  Updated NCR_700_readl/writel to use
  66  * __raw_readl/writel for parisc compatibility (Thomas
  67  * Bogendoerfer). Added missing SCp->request_bufflen initialisation
  68  * for sense requests (Ryan Bradetich).
  69  *
  70  * Version 2.6
  71  *
  72  * Following test of the 64 bit parisc kernel by Richard Hirst,
  73  * several problems have now been corrected.  Also adds support for
  74  * consistent memory allocation.
  75  *
  76  * Version 2.5
  77  *
  78  * More Compatibility changes for 710 (now actually works).  Enhanced
  79  * support for odd clock speeds which constrain SDTR negotiations.
  80  * correct cacheline separation for scsi messages and status for
  81  * incoherent architectures.  Use of the pci mapping functions on
  82  * buffers to begin support for 64 bit drivers.
  83  *
  84  * Version 2.4
  85  *
  86  * Added support for the 53c710 chip (in 53c700 emulation mode only---no
  87  * special 53c710 instructions or registers are used).
  88  *
  89  * Version 2.3
  90  *
  91  * More endianness/cache coherency changes.
  92  *
  93  * Better bad device handling (handles devices lying about tag
  94  * queueing support and devices which fail to provide sense data on
  95  * contingent allegiance conditions)
  96  *
  97  * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
  98  * debugging this driver on the parisc architecture and suggesting
  99  * many improvements and bug fixes.
 100  *
 101  * Thanks also go to Linuxcare Inc. for providing several PARISC
 102  * machines for me to debug the driver on.
 103  *
 104  * Version 2.2
 105  *
 106  * Made the driver mem or io mapped; added endian invariance; added
 107  * dma cache flushing operations for architectures which need it;
 108  * added support for more varied clocking speeds.
 109  *
 110  * Version 2.1
 111  *
 112  * Initial modularisation from the D700.  See NCR_D700.c for the rest of
 113  * the changelog.
 114  * */
 115 #define NCR_700_VERSION "2.8"
 116
 117 #include <linux/kernel.h>
 118 #include <linux/types.h>
 119 #include <linux/string.h>
 120 #include <linux/slab.h>
 121 #include <linux/ioport.h>
 122 #include <linux/delay.h>
 123 #include <linux/spinlock.h>
 124 #include <linux/completion.h>
 125 #include <linux/init.h>
 126 #include <linux/proc_fs.h>
 127 #include <linux/blkdev.h>
 128 #include <linux/module.h>
 129 #include <linux/interrupt.h>
 130 #include <linux/device.h>
 131 #include <asm/dma.h>
 132 #include <asm/io.h>
 133 #include <asm/pgtable.h>
 134 #include <asm/byteorder.h>
 135
 136 #include <scsi/scsi.h>
 137 #include <scsi/scsi_cmnd.h>
 138 #include <scsi/scsi_dbg.h>
 139 #include <scsi/scsi_eh.h>
 140 #include <scsi/scsi_host.h>
 141 #include <scsi/scsi_tcq.h>
 142 #include <scsi/scsi_transport.h>
 143 #include <scsi/scsi_transport_spi.h>
 144
 145 #include "53c700.h"
 146
 147 /* NOTE: For 64 bit drivers there are points in the code where we use
 148  * a non dereferenceable pointer to point to a structure in dma-able
 149  * memory (which is 32 bits) so that we can use all of the structure
 150  * operations but take the address at the end.  This macro allows us
 151  * to truncate the 64 bit pointer down to 32 bits without the compiler
 152  * complaining */
 153 #define to32bit(x)      ((__u32)((unsigned long)(x)))
 154
 155 #ifdef NCR_700_DEBUG
 156 #define STATIC
 157 #else
 158 #define STATIC static
 159 #endif
 160
 161 MODULE_AUTHOR("James Bottomley");
 162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
 163 MODULE_LICENSE("GPL");
 164
 165 /* This is the script */
 166 #include "53c700_d.h"
 167
 168
 169 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
 170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
 171 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
 172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
 173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
 174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
 175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
 176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
 177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
 178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
 179
 180 STATIC struct device_attribute *NCR_700_dev_attrs[];
 181
 182 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 183
 184 static char *NCR_700_phase[] = {
 185         "",
 186         "after selection",
 187         "before command phase",
 188         "after command phase",
 189         "after status phase",
 190         "after data in phase",
 191         "after data out phase",
 192         "during data phase",
 193 };
 194
 195 static char *NCR_700_condition[] = {
 196         "",
 197         "NOT MSG_OUT",
 198         "UNEXPECTED PHASE",
 199         "NOT MSG_IN",
 200         "UNEXPECTED MSG",
 201         "MSG_IN",
 202         "SDTR_MSG RECEIVED",
 203         "REJECT_MSG RECEIVED",
 204         "DISCONNECT_MSG RECEIVED",
 205         "MSG_OUT",
 206         "DATA_IN",
 207
 208 };
 209
 210 static char *NCR_700_fatal_messages[] = {
 211         "unexpected message after reselection",
 212         "still MSG_OUT after message injection",
 213         "not MSG_IN after selection",
 214         "Illegal message length received",
 215 };
 216
 217 static char *NCR_700_SBCL_bits[] = {
 218         "IO ",
 219         "CD ",
 220         "MSG ",
 221         "ATN ",
 222         "SEL ",
 223         "BSY ",
 224         "ACK ",
 225         "REQ ",
 226 };
 227
 228 static char *NCR_700_SBCL_to_phase[] = {
 229         "DATA_OUT",
 230         "DATA_IN",
 231         "CMD_OUT",
 232         "STATE",
 233         "ILLEGAL PHASE",
 234         "ILLEGAL PHASE",
 235         "MSG OUT",
 236         "MSG IN",
 237 };
 238
 239 /* This translates the SDTR message offset and period to a value
 240  * which can be loaded into the SXFER_REG.
 241  *
 242  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 243  *       actually four times this period value */
 244 static inline __u8
 245 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 246                                __u8 offset, __u8 period)
 247 {
 248         int XFERP;
 249
 250         __u8 min_xferp = (hostdata->chip710
 251                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 252         __u8 max_offset = (hostdata->chip710
 253                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 254
 255         if(offset == 0)
 256                 return 0;
 257
 258         if(period < hostdata->min_period) {
 259                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 260                 period = hostdata->min_period;
 261         }
 262         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 263         if(offset > max_offset) {
 264                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 265                        offset, max_offset);
 266                 offset = max_offset;
 267         }
 268         if(XFERP < min_xferp) {
 269                 XFERP =  min_xferp;
 270         }
 271         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 272 }
 273
 274 static inline __u8
 275 NCR_700_get_SXFER(struct scsi_device *SDp)
 276 {
 277         struct NCR_700_Host_Parameters *hostdata =
 278                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 279
 280         return NCR_700_offset_period_to_sxfer(hostdata,
 281                                               spi_offset(SDp->sdev_target),
 282                                               spi_period(SDp->sdev_target));
 283 }
 284
 285 struct Scsi_Host *
 286 NCR_700_detect(struct scsi_host_template *tpnt,
 287                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 288 {
 289         dma_addr_t pScript, pSlots;
 290         __u8 *memory;
 291         __u32 *script;
 292         struct Scsi_Host *host;
 293         static int banner = 0;
 294         int j;
 295
 296         if(tpnt->sdev_attrs == NULL)
 297                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 298
 299         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 300                                        &pScript, GFP_KERNEL);
 301         if(memory == NULL) {
 302                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
 303                 return NULL;
 304         }
 305
 306         script = (__u32 *)memory;
 307         hostdata->msgin = memory + MSGIN_OFFSET;
 308         hostdata->msgout = memory + MSGOUT_OFFSET;
 309         hostdata->status = memory + STATUS_OFFSET;
 310         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 311         hostdata->dev = dev;
 312
 313         pSlots = pScript + SLOTS_OFFSET;
 314
 315         /* Fill in the missing routines from the host template */
 316         tpnt->queuecommand = NCR_700_queuecommand;
 317         tpnt->eh_abort_handler = NCR_700_abort;
 318         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
 319         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 320         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 321         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 322         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 323         tpnt->use_clustering = ENABLE_CLUSTERING;
 324         tpnt->slave_configure = NCR_700_slave_configure;
 325         tpnt->slave_destroy = NCR_700_slave_destroy;
 326         tpnt->slave_alloc = NCR_700_slave_alloc;
 327         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 328         tpnt->use_blk_tags = 1;
 329
 330         if(tpnt->name == NULL)
 331                 tpnt->name = "53c700";
 332         if(tpnt->proc_name == NULL)
 333                 tpnt->proc_name = "53c700";
 334
 335         host = scsi_host_alloc(tpnt, 4);
 336         if (!host)
 337                 return NULL;
 338         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 339                * NCR_700_COMMAND_SLOTS_PER_HOST);
 340         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 341                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 342                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 343                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 344                 if(j == 0)
 345                         hostdata->free_list = &hostdata->slots[j];
 346                 else
 347                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 348                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 349         }
 350
 351         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 352                 script[j] = bS_to_host(SCRIPT[j]);
 353
 354         /* adjust all labels to be bus physical */
 355         for (j = 0; j < PATCHES; j++)
 356                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 357         /* now patch up fixed addresses. */
 358         script_patch_32(hostdata->dev, script, MessageLocation,
 359                         pScript + MSGOUT_OFFSET);
 360         script_patch_32(hostdata->dev, script, StatusAddress,
 361                         pScript + STATUS_OFFSET);
 362         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
 363                         pScript + MSGIN_OFFSET);
 364
 365         hostdata->script = script;
 366         hostdata->pScript = pScript;
 367         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 368         hostdata->state = NCR_700_HOST_FREE;
 369         hostdata->cmd = NULL;
 370         host->max_id = 8;
 371         host->max_lun = NCR_700_MAX_LUNS;
 372         BUG_ON(NCR_700_transport_template == NULL);
 373         host->transportt = NCR_700_transport_template;
 374         host->unique_id = (unsigned long)hostdata->base;
 375         hostdata->eh_complete = NULL;
 376         host->hostdata[0] = (unsigned long)hostdata;
 377         /* kick the chip */
 378         NCR_700_writeb(0xff, host, CTEST9_REG);
 379         if (hostdata->chip710)
 380                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 381         else
 382                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 383         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 384         if (banner == 0) {
 385                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 386                 banner = 1;
 387         }
 388         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 389                hostdata->chip710 ? "53c710" :
 390                (hostdata->fast ? "53c700-66" : "53c700"),
 391                hostdata->rev, hostdata->differential ?
 392                "(Differential)" : "");
 393         /* reset the chip */
 394         NCR_700_chip_reset(host);
 395
 396         if (scsi_add_host(host, dev)) {
 397                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 398                 scsi_host_put(host);
 399                 return NULL;
 400         }
 401
 402         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 403                 SPI_SIGNAL_SE;
 404
 405         return host;
 406 }
 407
 408 int
 409 NCR_700_release(struct Scsi_Host *host)
 410 {
 411         struct NCR_700_Host_Parameters *hostdata =
 412                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 413
 414         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 415                                hostdata->script, hostdata->pScript);
 416         return 1;
 417 }
 418
 419 static inline __u8
 420 NCR_700_identify(int can_disconnect, __u8 lun)
 421 {
 422         return IDENTIFY_BASE |
 423                 ((can_disconnect) ? 0x40 : 0) |
 424                 (lun & NCR_700_LUN_MASK);
 425 }
 426
 427 /*
 428  * Function : static int data_residual (Scsi_Host *host)
 429  *
 430  * Purpose : return residual data count of what's in the chip.  If you
 431  * really want to know what this function is doing, it's almost a
 432  * direct transcription of the algorithm described in the 53c710
 433  * guide, except that the DBC and DFIFO registers are only 6 bits
 434  * wide on a 53c700.
 435  *
 436  * Inputs : host - SCSI host */
 437 static inline int
 438 NCR_700_data_residual (struct Scsi_Host *host) {
 439         struct NCR_700_Host_Parameters *hostdata =
 440                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 441         int count, synchronous = 0;
 442         unsigned int ddir;
 443
 444         if(hostdata->chip710) {
 445                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 446                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 447         } else {
 448                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 449                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 450         }
 451
 452         if(hostdata->fast)
 453                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 454
 455         /* get the data direction */
 456         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 457
 458         if (ddir) {
 459                 /* Receive */
 460                 if (synchronous)
 461                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 462                 else
 463                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 464                                 ++count;
 465         } else {
 466                 /* Send */
 467                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 468                 if (sstat & SODL_REG_FULL)
 469                         ++count;
 470                 if (synchronous && (sstat & SODR_REG_FULL))
 471                         ++count;
 472         }
 473 #ifdef NCR_700_DEBUG
 474         if(count)
 475                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 476 #endif
 477         return count;
 478 }
 479
 480 /* print out the SCSI wires and corresponding phase from the SBCL register
 481  * in the chip */
 482 static inline char *
 483 sbcl_to_string(__u8 sbcl)
 484 {
 485         int i;
 486         static char ret[256];
 487
 488         ret[0]='\0';
 489         for(i=0; i<8; i++) {
 490                 if((1<<i) & sbcl)
 491                         strcat(ret, NCR_700_SBCL_bits[i]);
 492         }
 493         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 494         return ret;
 495 }
 496
 497 static inline __u8
 498 bitmap_to_number(__u8 bitmap)
 499 {
 500         __u8 i;
 501
 502         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 503                 ;
 504         return i;
 505 }
 506
 507 /* Pull a slot off the free list */
 508 STATIC struct NCR_700_command_slot *
 509 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 510 {
 511         struct NCR_700_command_slot *slot = hostdata->free_list;
 512
 513         if(slot == NULL) {
 514                 /* sanity check */
 515                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 516                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 517                 return NULL;
 518         }
 519
 520         if(slot->state != NCR_700_SLOT_FREE)
 521                 /* should panic! */
 522                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 523
 524
 525         hostdata->free_list = slot->ITL_forw;
 526         slot->ITL_forw = NULL;
 527
 528
 529         /* NOTE: set the state to busy here, not queued, since this
 530          * indicates the slot is in use and cannot be run by the IRQ
 531          * finish routine.  If we cannot queue the command when it
 532          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 533         slot->state = NCR_700_SLOT_BUSY;
 534         slot->flags = 0;
 535         hostdata->command_slot_count++;
 536
 537         return slot;
 538 }
 539
 540 STATIC void
 541 free_slot(struct NCR_700_command_slot *slot,
 542           struct NCR_700_Host_Parameters *hostdata)
 543 {
 544         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 545                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 546         }
 547         if(slot->state == NCR_700_SLOT_FREE) {
 548                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 549         }
 550
 551         slot->resume_offset = 0;
 552         slot->cmnd = NULL;
 553         slot->state = NCR_700_SLOT_FREE;
 554         slot->ITL_forw = hostdata->free_list;
 555         hostdata->free_list = slot;
 556         hostdata->command_slot_count--;
 557 }
 558
 559
 560 /* This routine really does very little.  The command is indexed on
 561    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 562 STATIC void
 563 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 564                      struct scsi_cmnd *SCp, __u32 dsp)
 565 {
 566         /* Its just possible that this gets executed twice */
 567         if(SCp != NULL) {
 568                 struct NCR_700_command_slot *slot =
 569                         (struct NCR_700_command_slot *)SCp->host_scribble;
 570
 571                 slot->resume_offset = dsp;
 572         }
 573         hostdata->state = NCR_700_HOST_FREE;
 574         hostdata->cmd = NULL;
 575 }
 576
 577 STATIC inline void
 578 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 579               struct NCR_700_command_slot *slot)
 580 {
 581         if(SCp->sc_data_direction != DMA_NONE &&
 582            SCp->sc_data_direction != DMA_BIDIRECTIONAL)
 583                 scsi_dma_unmap(SCp);
 584 }
 585
 586 STATIC inline void
 587 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 588                struct scsi_cmnd *SCp, int result)
 589 {
 590         hostdata->state = NCR_700_HOST_FREE;
 591         hostdata->cmd = NULL;
 592
 593         if(SCp != NULL) {
 594                 struct NCR_700_command_slot *slot =
 595                         (struct NCR_700_command_slot *)SCp->host_scribble;
 596
 597                 dma_unmap_single(hostdata->dev, slot->pCmd,
 598                                  MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 599                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 600                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 601
 602                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 603                                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 604                         /* restore the old result if the request sense was
 605                          * successful */
 606                         if (result == 0)
 607                                 result = cmnd[7];
 608                         /* restore the original length */
 609                         SCp->cmd_len = cmnd[8];
 610                 } else
 611                         NCR_700_unmap(hostdata, SCp, slot);
 612
 613                 free_slot(slot, hostdata);
 614 #ifdef NCR_700_DEBUG
 615                 if(NCR_700_get_depth(SCp->device) == 0 ||
 616                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 617                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 618                                NCR_700_get_depth(SCp->device));
 619 #endif /* NCR_700_DEBUG */
 620                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 621
 622                 SCp->host_scribble = NULL;
 623                 SCp->result = result;
 624                 SCp->scsi_done(SCp);
 625         } else {
 626                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 627         }
 628 }
 629
 630
 631 STATIC void
 632 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 633 {
 634         /* Bus reset */
 635         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 636         udelay(50);
 637         NCR_700_writeb(0, host, SCNTL1_REG);
 638
 639 }
 640
 641 STATIC void
 642 NCR_700_chip_setup(struct Scsi_Host *host)
 643 {
 644         struct NCR_700_Host_Parameters *hostdata =
 645                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 646         __u8 min_period;
 647         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 648
 649         if(hostdata->chip710) {
 650                 __u8 burst_disable = 0;
 651                 __u8 burst_length = 0;
 652
 653                 switch (hostdata->burst_length) {
 654                         case 1:
 655                                 burst_length = BURST_LENGTH_1;
 656                                 break;
 657                         case 2:
 658                                 burst_length = BURST_LENGTH_2;
 659                                 break;
 660                         case 4:
 661                                 burst_length = BURST_LENGTH_4;
 662                                 break;
 663                         case 8:
 664                                 burst_length = BURST_LENGTH_8;
 665                                 break;
 666                         default:
 667                                 burst_disable = BURST_DISABLE;
 668                                 break;
 669                 }
 670                 hostdata->dcntl_extra |= COMPAT_700_MODE;
 671
 672                 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
 673                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
 674                                host, DMODE_710_REG);
 675                 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
 676                                (hostdata->differential ? DIFF : 0),
 677                                host, CTEST7_REG);
 678                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 679                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 680                                | AUTO_ATN, host, SCNTL0_REG);
 681         } else {
 682                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 683                                host, DMODE_700_REG);
 684                 NCR_700_writeb(hostdata->differential ?
 685                                DIFF : 0, host, CTEST7_REG);
 686                 if(hostdata->fast) {
 687                         /* this is for 700-66, does nothing on 700 */
 688                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 689                                        | GENERATE_RECEIVE_PARITY, host,
 690                                        CTEST8_REG);
 691                 } else {
 692                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 693                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 694                 }
 695         }
 696
 697         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 698         NCR_700_writeb(0, host, SBCL_REG);
 699         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 700
 701         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 702              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 703
 704         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 705         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 706         if(hostdata->clock > 75) {
 707                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 708                 /* do the best we can, but the async clock will be out
 709                  * of spec: sync divider 2, async divider 3 */
 710                 DEBUG(("53c700: sync 2 async 3\n"));
 711                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 712                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 713                 hostdata->sync_clock = hostdata->clock/2;
 714         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 715                 /* sync divider 1.5, async divider 3 */
 716                 DEBUG(("53c700: sync 1.5 async 3\n"));
 717                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 718                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 719                 hostdata->sync_clock = hostdata->clock*2;
 720                 hostdata->sync_clock /= 3;
 721
 722         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 723                 /* sync divider 1, async divider 2 */
 724                 DEBUG(("53c700: sync 1 async 2\n"));
 725                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 726                 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 727                 hostdata->sync_clock = hostdata->clock;
 728         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 729                 /* sync divider 1, async divider 1.5 */
 730                 DEBUG(("53c700: sync 1 async 1.5\n"));
 731                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 732                 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
 733                 hostdata->sync_clock = hostdata->clock;
 734         } else {
 735                 DEBUG(("53c700: sync 1 async 1\n"));
 736                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 737                 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 738                 /* sync divider 1, async divider 1 */
 739                 hostdata->sync_clock = hostdata->clock;
 740         }
 741         /* Calculate the actual minimum period that can be supported
 742          * by our synchronous clock speed.  See the 710 manual for
 743          * exact details of this calculation which is based on a
 744          * setting of the SXFER register */
 745         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 746         hostdata->min_period = NCR_700_MIN_PERIOD;
 747         if(min_period > NCR_700_MIN_PERIOD)
 748                 hostdata->min_period = min_period;
 749 }
 750
 751 STATIC void
 752 NCR_700_chip_reset(struct Scsi_Host *host)
 753 {
 754         struct NCR_700_Host_Parameters *hostdata =
 755                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 756         if(hostdata->chip710) {
 757                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 758                 udelay(100);
 759
 760                 NCR_700_writeb(0, host, ISTAT_REG);
 761         } else {
 762                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 763                 udelay(100);
 764
 765                 NCR_700_writeb(0, host, DCNTL_REG);
 766         }
 767
 768         mdelay(1000);
 769
 770         NCR_700_chip_setup(host);
 771 }
 772
 773 /* The heart of the message processing engine is that the instruction
 774  * immediately after the INT is the normal case (and so must be CLEAR
 775  * ACK).  If we want to do something else, we call that routine in
 776  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 777  * ACK) so that the routine returns correctly to resume its activity
 778  * */
 779 STATIC __u32
 780 process_extended_message(struct Scsi_Host *host,
 781                          struct NCR_700_Host_Parameters *hostdata,
 782                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 783 {
 784         __u32 resume_offset = dsp, temp = dsp + 8;
 785         __u8 pun = 0xff, lun = 0xff;
 786
 787         if(SCp != NULL) {
 788                 pun = SCp->device->id;
 789                 lun = SCp->device->lun;
 790         }
 791
 792         switch(hostdata->msgin[2]) {
 793         case A_SDTR_MSG:
 794                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 795                         struct scsi_target *starget = SCp->device->sdev_target;
 796                         __u8 period = hostdata->msgin[3];
 797                         __u8 offset = hostdata->msgin[4];
 798
 799                         if(offset == 0 || period == 0) {
 800                                 offset = 0;
 801                                 period = 0;
 802                         }
 803
 804                         spi_offset(starget) = offset;
 805                         spi_period(starget) = period;
 806
 807                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 808                                 spi_display_xfer_agreement(starget);
 809                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 810                         }
 811
 812                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 813                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 814
 815                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 816                                        host, SXFER_REG);
 817
 818                 } else {
 819                         /* SDTR message out of the blue, reject it */
 820                         shost_printk(KERN_WARNING, host,
 821                                 "Unexpected SDTR msg\n");
 822                         hostdata->msgout[0] = A_REJECT_MSG;
 823                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 824                         script_patch_16(hostdata->dev, hostdata->script,
 825                                         MessageCount, 1);
 826                         /* SendMsgOut returns, so set up the return
 827                          * address */
 828                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 829                 }
 830                 break;
 831
 832         case A_WDTR_MSG:
 833                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 834                        host->host_no, pun, lun);
 835                 hostdata->msgout[0] = A_REJECT_MSG;
 836                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 837                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 838                                 1);
 839                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 840
 841                 break;
 842
 843         default:
 844                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 845                        host->host_no, pun, lun,
 846                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 847                 spi_print_msg(hostdata->msgin);
 848                 printk("\n");
 849                 /* just reject it */
 850                 hostdata->msgout[0] = A_REJECT_MSG;
 851                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 852                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 853                                 1);
 854                 /* SendMsgOut returns, so set up the return
 855                  * address */
 856                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 857         }
 858         NCR_700_writel(temp, host, TEMP_REG);
 859         return resume_offset;
 860 }
 861
 862 STATIC __u32
 863 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 864                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 865 {
 866         /* work out where to return to */
 867         __u32 temp = dsp + 8, resume_offset = dsp;
 868         __u8 pun = 0xff, lun = 0xff;
 869
 870         if(SCp != NULL) {
 871                 pun = SCp->device->id;
 872                 lun = SCp->device->lun;
 873         }
 874
 875 #ifdef NCR_700_DEBUG
 876         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 877                NCR_700_phase[(dsps & 0xf00) >> 8]);
 878         spi_print_msg(hostdata->msgin);
 879         printk("\n");
 880 #endif
 881
 882         switch(hostdata->msgin[0]) {
 883
 884         case A_EXTENDED_MSG:
 885                 resume_offset =  process_extended_message(host, hostdata, SCp,
 886                                                           dsp, dsps);
 887                 break;
 888
 889         case A_REJECT_MSG:
 890                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 891                         /* Rejected our sync negotiation attempt */
 892                         spi_period(SCp->device->sdev_target) =
 893                                 spi_offset(SCp->device->sdev_target) = 0;
 894                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 895                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 896                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 897                         /* rejected our first simple tag message */
 898                         scmd_printk(KERN_WARNING, SCp,
 899                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 900                         /* we're done negotiating */
 901                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 902                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 903
 904                         SCp->device->tagged_supported = 0;
 905                         SCp->device->simple_tags = 0;
 906                         scsi_change_queue_depth(SCp->device, 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             SCp->device->simple_tags) {
1821                 slot->tag = SCp->request->tag;
1822                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1823                        slot->tag, slot);
1824         } else {
1825                 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_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2054                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2055         }
2056
2057         if(hostdata->fast) {
2058                 /* Find the correct offset and period via domain validation */
2059                 if (!spi_initial_dv(SDp->sdev_target))
2060                         spi_dv_device(SDp);
2061         } else {
2062                 spi_offset(SDp->sdev_target) = 0;
2063                 spi_period(SDp->sdev_target) = 0;
2064         }
2065         return 0;
2066 }
2067
2068 STATIC void
2069 NCR_700_slave_destroy(struct scsi_device *SDp)
2070 {
2071         kfree(SDp->hostdata);
2072         SDp->hostdata = NULL;
2073 }
2074
2075 static int
2076 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2077 {
2078         if (depth > NCR_700_MAX_TAGS)
2079                 depth = NCR_700_MAX_TAGS;
2080         return scsi_change_queue_depth(SDp, depth);
2081 }
2082
2083 static ssize_t
2084 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2085 {
2086         struct scsi_device *SDp = to_scsi_device(dev);
2087
2088         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2089 }
2090
2091 static struct device_attribute NCR_700_active_tags_attr = {
2092         .attr = {
2093                 .name =         "active_tags",
2094                 .mode =         S_IRUGO,
2095         },
2096         .show = NCR_700_show_active_tags,
2097 };
2098
2099 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2100         &NCR_700_active_tags_attr,
2101         NULL,
2102 };
2103
2104 EXPORT_SYMBOL(NCR_700_detect);
2105 EXPORT_SYMBOL(NCR_700_release);
2106 EXPORT_SYMBOL(NCR_700_intr);
2107
2108 static struct spi_function_template NCR_700_transport_functions =  {
2109         .set_period     = NCR_700_set_period,
2110         .show_period    = 1,
2111         .set_offset     = NCR_700_set_offset,
2112         .show_offset    = 1,
2113 };
2114
2115 static int __init NCR_700_init(void)
2116 {
2117         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2118         if(!NCR_700_transport_template)
2119                 return -ENODEV;
2120         return 0;
2121 }
2122
2123 static void __exit NCR_700_exit(void)
2124 {
2125         spi_release_transport(NCR_700_transport_template);
2126 }
2127
2128 module_init(NCR_700_init);
2129 module_exit(NCR_700_exit);
2130