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/system.h>
 133 #include <asm/io.h>
 134 #include <asm/pgtable.h>
 135 #include <asm/byteorder.h>
 136
 137 #include <scsi/scsi.h>
 138 #include <scsi/scsi_cmnd.h>
 139 #include <scsi/scsi_dbg.h>
 140 #include <scsi/scsi_eh.h>
 141 #include <scsi/scsi_host.h>
 142 #include <scsi/scsi_tcq.h>
 143 #include <scsi/scsi_transport.h>
 144 #include <scsi/scsi_transport_spi.h>
 145
 146 #include "53c700.h"
 147
 148 /* NOTE: For 64 bit drivers there are points in the code where we use
 149  * a non dereferenceable pointer to point to a structure in dma-able
 150  * memory (which is 32 bits) so that we can use all of the structure
 151  * operations but take the address at the end.  This macro allows us
 152  * to truncate the 64 bit pointer down to 32 bits without the compiler
 153  * complaining */
 154 #define to32bit(x)      ((__u32)((unsigned long)(x)))
 155
 156 #ifdef NCR_700_DEBUG
 157 #define STATIC
 158 #else
 159 #define STATIC static
 160 #endif
 161
 162 MODULE_AUTHOR("James Bottomley");
 163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
 164 MODULE_LICENSE("GPL");
 165
 166 /* This is the script */
 167 #include "53c700_d.h"
 168
 169
 170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
 171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
 172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
 173 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
 174 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
 175 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
 176 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
 177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
 178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
 179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth, int reason);
 180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
 181
 182 STATIC struct device_attribute *NCR_700_dev_attrs[];
 183
 184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 185
 186 static char *NCR_700_phase[] = {
 187         "",
 188         "after selection",
 189         "before command phase",
 190         "after command phase",
 191         "after status phase",
 192         "after data in phase",
 193         "after data out phase",
 194         "during data phase",
 195 };
 196
 197 static char *NCR_700_condition[] = {
 198         "",
 199         "NOT MSG_OUT",
 200         "UNEXPECTED PHASE",
 201         "NOT MSG_IN",
 202         "UNEXPECTED MSG",
 203         "MSG_IN",
 204         "SDTR_MSG RECEIVED",
 205         "REJECT_MSG RECEIVED",
 206         "DISCONNECT_MSG RECEIVED",
 207         "MSG_OUT",
 208         "DATA_IN",
 209
 210 };
 211
 212 static char *NCR_700_fatal_messages[] = {
 213         "unexpected message after reselection",
 214         "still MSG_OUT after message injection",
 215         "not MSG_IN after selection",
 216         "Illegal message length received",
 217 };
 218
 219 static char *NCR_700_SBCL_bits[] = {
 220         "IO ",
 221         "CD ",
 222         "MSG ",
 223         "ATN ",
 224         "SEL ",
 225         "BSY ",
 226         "ACK ",
 227         "REQ ",
 228 };
 229
 230 static char *NCR_700_SBCL_to_phase[] = {
 231         "DATA_OUT",
 232         "DATA_IN",
 233         "CMD_OUT",
 234         "STATE",
 235         "ILLEGAL PHASE",
 236         "ILLEGAL PHASE",
 237         "MSG OUT",
 238         "MSG IN",
 239 };
 240
 241 /* This translates the SDTR message offset and period to a value
 242  * which can be loaded into the SXFER_REG.
 243  *
 244  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 245  *       actually four times this period value */
 246 static inline __u8
 247 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 248                                __u8 offset, __u8 period)
 249 {
 250         int XFERP;
 251
 252         __u8 min_xferp = (hostdata->chip710
 253                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 254         __u8 max_offset = (hostdata->chip710
 255                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 256
 257         if(offset == 0)
 258                 return 0;
 259
 260         if(period < hostdata->min_period) {
 261                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 262                 period = hostdata->min_period;
 263         }
 264         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 265         if(offset > max_offset) {
 266                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 267                        offset, max_offset);
 268                 offset = max_offset;
 269         }
 270         if(XFERP < min_xferp) {
 271                 XFERP =  min_xferp;
 272         }
 273         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 274 }
 275
 276 static inline __u8
 277 NCR_700_get_SXFER(struct scsi_device *SDp)
 278 {
 279         struct NCR_700_Host_Parameters *hostdata =
 280                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 281
 282         return NCR_700_offset_period_to_sxfer(hostdata,
 283                                               spi_offset(SDp->sdev_target),
 284                                               spi_period(SDp->sdev_target));
 285 }
 286
 287 struct Scsi_Host *
 288 NCR_700_detect(struct scsi_host_template *tpnt,
 289                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 290 {
 291         dma_addr_t pScript, pSlots;
 292         __u8 *memory;
 293         __u32 *script;
 294         struct Scsi_Host *host;
 295         static int banner = 0;
 296         int j;
 297
 298         if(tpnt->sdev_attrs == NULL)
 299                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 300
 301         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 302                                        &pScript, GFP_KERNEL);
 303         if(memory == NULL) {
 304                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
 305                 return NULL;
 306         }
 307
 308         script = (__u32 *)memory;
 309         hostdata->msgin = memory + MSGIN_OFFSET;
 310         hostdata->msgout = memory + MSGOUT_OFFSET;
 311         hostdata->status = memory + STATUS_OFFSET;
 312         /* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
 313          * if this isn't sufficient separation to avoid dma flushing issues */
 314         BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
 315         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 316         hostdata->dev = dev;
 317
 318         pSlots = pScript + SLOTS_OFFSET;
 319
 320         /* Fill in the missing routines from the host template */
 321         tpnt->queuecommand = NCR_700_queuecommand;
 322         tpnt->eh_abort_handler = NCR_700_abort;
 323         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
 324         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 325         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 326         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 327         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 328         tpnt->use_clustering = ENABLE_CLUSTERING;
 329         tpnt->slave_configure = NCR_700_slave_configure;
 330         tpnt->slave_destroy = NCR_700_slave_destroy;
 331         tpnt->slave_alloc = NCR_700_slave_alloc;
 332         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 333         tpnt->change_queue_type = NCR_700_change_queue_type;
 334
 335         if(tpnt->name == NULL)
 336                 tpnt->name = "53c700";
 337         if(tpnt->proc_name == NULL)
 338                 tpnt->proc_name = "53c700";
 339
 340         host = scsi_host_alloc(tpnt, 4);
 341         if (!host)
 342                 return NULL;
 343         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 344                * NCR_700_COMMAND_SLOTS_PER_HOST);
 345         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 346                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 347                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 348                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 349                 if(j == 0)
 350                         hostdata->free_list = &hostdata->slots[j];
 351                 else
 352                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 353                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 354         }
 355
 356         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 357                 script[j] = bS_to_host(SCRIPT[j]);
 358
 359         /* adjust all labels to be bus physical */
 360         for (j = 0; j < PATCHES; j++)
 361                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 362         /* now patch up fixed addresses. */
 363         script_patch_32(hostdata->dev, script, MessageLocation,
 364                         pScript + MSGOUT_OFFSET);
 365         script_patch_32(hostdata->dev, script, StatusAddress,
 366                         pScript + STATUS_OFFSET);
 367         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
 368                         pScript + MSGIN_OFFSET);
 369
 370         hostdata->script = script;
 371         hostdata->pScript = pScript;
 372         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 373         hostdata->state = NCR_700_HOST_FREE;
 374         hostdata->cmd = NULL;
 375         host->max_id = 8;
 376         host->max_lun = NCR_700_MAX_LUNS;
 377         BUG_ON(NCR_700_transport_template == NULL);
 378         host->transportt = NCR_700_transport_template;
 379         host->unique_id = (unsigned long)hostdata->base;
 380         hostdata->eh_complete = NULL;
 381         host->hostdata[0] = (unsigned long)hostdata;
 382         /* kick the chip */
 383         NCR_700_writeb(0xff, host, CTEST9_REG);
 384         if (hostdata->chip710)
 385                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 386         else
 387                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 388         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 389         if (banner == 0) {
 390                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 391                 banner = 1;
 392         }
 393         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 394                hostdata->chip710 ? "53c710" :
 395                (hostdata->fast ? "53c700-66" : "53c700"),
 396                hostdata->rev, hostdata->differential ?
 397                "(Differential)" : "");
 398         /* reset the chip */
 399         NCR_700_chip_reset(host);
 400
 401         if (scsi_add_host(host, dev)) {
 402                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 403                 scsi_host_put(host);
 404                 return NULL;
 405         }
 406
 407         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 408                 SPI_SIGNAL_SE;
 409
 410         return host;
 411 }
 412
 413 int
 414 NCR_700_release(struct Scsi_Host *host)
 415 {
 416         struct NCR_700_Host_Parameters *hostdata =
 417                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 418
 419         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 420                                hostdata->script, hostdata->pScript);
 421         return 1;
 422 }
 423
 424 static inline __u8
 425 NCR_700_identify(int can_disconnect, __u8 lun)
 426 {
 427         return IDENTIFY_BASE |
 428                 ((can_disconnect) ? 0x40 : 0) |
 429                 (lun & NCR_700_LUN_MASK);
 430 }
 431
 432 /*
 433  * Function : static int data_residual (Scsi_Host *host)
 434  *
 435  * Purpose : return residual data count of what's in the chip.  If you
 436  * really want to know what this function is doing, it's almost a
 437  * direct transcription of the algorithm described in the 53c710
 438  * guide, except that the DBC and DFIFO registers are only 6 bits
 439  * wide on a 53c700.
 440  *
 441  * Inputs : host - SCSI host */
 442 static inline int
 443 NCR_700_data_residual (struct Scsi_Host *host) {
 444         struct NCR_700_Host_Parameters *hostdata =
 445                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 446         int count, synchronous = 0;
 447         unsigned int ddir;
 448
 449         if(hostdata->chip710) {
 450                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 451                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 452         } else {
 453                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 454                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 455         }
 456
 457         if(hostdata->fast)
 458                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 459
 460         /* get the data direction */
 461         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 462
 463         if (ddir) {
 464                 /* Receive */
 465                 if (synchronous)
 466                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 467                 else
 468                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 469                                 ++count;
 470         } else {
 471                 /* Send */
 472                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 473                 if (sstat & SODL_REG_FULL)
 474                         ++count;
 475                 if (synchronous && (sstat & SODR_REG_FULL))
 476                         ++count;
 477         }
 478 #ifdef NCR_700_DEBUG
 479         if(count)
 480                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 481 #endif
 482         return count;
 483 }
 484
 485 /* print out the SCSI wires and corresponding phase from the SBCL register
 486  * in the chip */
 487 static inline char *
 488 sbcl_to_string(__u8 sbcl)
 489 {
 490         int i;
 491         static char ret[256];
 492
 493         ret[0]='\0';
 494         for(i=0; i<8; i++) {
 495                 if((1<<i) & sbcl)
 496                         strcat(ret, NCR_700_SBCL_bits[i]);
 497         }
 498         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 499         return ret;
 500 }
 501
 502 static inline __u8
 503 bitmap_to_number(__u8 bitmap)
 504 {
 505         __u8 i;
 506
 507         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 508                 ;
 509         return i;
 510 }
 511
 512 /* Pull a slot off the free list */
 513 STATIC struct NCR_700_command_slot *
 514 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 515 {
 516         struct NCR_700_command_slot *slot = hostdata->free_list;
 517
 518         if(slot == NULL) {
 519                 /* sanity check */
 520                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 521                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 522                 return NULL;
 523         }
 524
 525         if(slot->state != NCR_700_SLOT_FREE)
 526                 /* should panic! */
 527                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 528
 529
 530         hostdata->free_list = slot->ITL_forw;
 531         slot->ITL_forw = NULL;
 532
 533
 534         /* NOTE: set the state to busy here, not queued, since this
 535          * indicates the slot is in use and cannot be run by the IRQ
 536          * finish routine.  If we cannot queue the command when it
 537          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 538         slot->state = NCR_700_SLOT_BUSY;
 539         slot->flags = 0;
 540         hostdata->command_slot_count++;
 541
 542         return slot;
 543 }
 544
 545 STATIC void
 546 free_slot(struct NCR_700_command_slot *slot,
 547           struct NCR_700_Host_Parameters *hostdata)
 548 {
 549         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 550                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 551         }
 552         if(slot->state == NCR_700_SLOT_FREE) {
 553                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 554         }
 555
 556         slot->resume_offset = 0;
 557         slot->cmnd = NULL;
 558         slot->state = NCR_700_SLOT_FREE;
 559         slot->ITL_forw = hostdata->free_list;
 560         hostdata->free_list = slot;
 561         hostdata->command_slot_count--;
 562 }
 563
 564
 565 /* This routine really does very little.  The command is indexed on
 566    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 567 STATIC void
 568 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 569                      struct scsi_cmnd *SCp, __u32 dsp)
 570 {
 571         /* Its just possible that this gets executed twice */
 572         if(SCp != NULL) {
 573                 struct NCR_700_command_slot *slot =
 574                         (struct NCR_700_command_slot *)SCp->host_scribble;
 575
 576                 slot->resume_offset = dsp;
 577         }
 578         hostdata->state = NCR_700_HOST_FREE;
 579         hostdata->cmd = NULL;
 580 }
 581
 582 STATIC inline void
 583 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 584               struct NCR_700_command_slot *slot)
 585 {
 586         if(SCp->sc_data_direction != DMA_NONE &&
 587            SCp->sc_data_direction != DMA_BIDIRECTIONAL)
 588                 scsi_dma_unmap(SCp);
 589 }
 590
 591 STATIC inline void
 592 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 593                struct scsi_cmnd *SCp, int result)
 594 {
 595         hostdata->state = NCR_700_HOST_FREE;
 596         hostdata->cmd = NULL;
 597
 598         if(SCp != NULL) {
 599                 struct NCR_700_command_slot *slot =
 600                         (struct NCR_700_command_slot *)SCp->host_scribble;
 601
 602                 dma_unmap_single(hostdata->dev, slot->pCmd,
 603                                  MAX_COMMAND_SIZE, DMA_TO_DEVICE);
 604                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 605                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 606 #ifdef NCR_700_DEBUG
 607                         printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
 608                                SCp, SCp->cmnd[7], result);
 609                         scsi_print_sense("53c700", SCp);
 610
 611 #endif
 612                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 613                                          SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
 614                         /* restore the old result if the request sense was
 615                          * successful */
 616                         if (result == 0)
 617                                 result = cmnd[7];
 618                         /* restore the original length */
 619                         SCp->cmd_len = cmnd[8];
 620                 } else
 621                         NCR_700_unmap(hostdata, SCp, slot);
 622
 623                 free_slot(slot, hostdata);
 624 #ifdef NCR_700_DEBUG
 625                 if(NCR_700_get_depth(SCp->device) == 0 ||
 626                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 627                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 628                                NCR_700_get_depth(SCp->device));
 629 #endif /* NCR_700_DEBUG */
 630                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 631
 632                 SCp->host_scribble = NULL;
 633                 SCp->result = result;
 634                 SCp->scsi_done(SCp);
 635         } else {
 636                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 637         }
 638 }
 639
 640
 641 STATIC void
 642 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 643 {
 644         /* Bus reset */
 645         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 646         udelay(50);
 647         NCR_700_writeb(0, host, SCNTL1_REG);
 648
 649 }
 650
 651 STATIC void
 652 NCR_700_chip_setup(struct Scsi_Host *host)
 653 {
 654         struct NCR_700_Host_Parameters *hostdata =
 655                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 656         __u8 min_period;
 657         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 658
 659         if(hostdata->chip710) {
 660                 __u8 burst_disable = 0;
 661                 __u8 burst_length = 0;
 662
 663                 switch (hostdata->burst_length) {
 664                         case 1:
 665                                 burst_length = BURST_LENGTH_1;
 666                                 break;
 667                         case 2:
 668                                 burst_length = BURST_LENGTH_2;
 669                                 break;
 670                         case 4:
 671                                 burst_length = BURST_LENGTH_4;
 672                                 break;
 673                         case 8:
 674                                 burst_length = BURST_LENGTH_8;
 675                                 break;
 676                         default:
 677                                 burst_disable = BURST_DISABLE;
 678                                 break;
 679                 }
 680                 hostdata->dcntl_extra |= COMPAT_700_MODE;
 681
 682                 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
 683                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
 684                                host, DMODE_710_REG);
 685                 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
 686                                (hostdata->differential ? DIFF : 0),
 687                                host, CTEST7_REG);
 688                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 689                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 690                                | AUTO_ATN, host, SCNTL0_REG);
 691         } else {
 692                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 693                                host, DMODE_700_REG);
 694                 NCR_700_writeb(hostdata->differential ?
 695                                DIFF : 0, host, CTEST7_REG);
 696                 if(hostdata->fast) {
 697                         /* this is for 700-66, does nothing on 700 */
 698                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 699                                        | GENERATE_RECEIVE_PARITY, host,
 700                                        CTEST8_REG);
 701                 } else {
 702                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 703                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 704                 }
 705         }
 706
 707         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 708         NCR_700_writeb(0, host, SBCL_REG);
 709         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 710
 711         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 712              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 713
 714         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 715         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 716         if(hostdata->clock > 75) {
 717                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 718                 /* do the best we can, but the async clock will be out
 719                  * of spec: sync divider 2, async divider 3 */
 720                 DEBUG(("53c700: sync 2 async 3\n"));
 721                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 722                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 723                 hostdata->sync_clock = hostdata->clock/2;
 724         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 725                 /* sync divider 1.5, async divider 3 */
 726                 DEBUG(("53c700: sync 1.5 async 3\n"));
 727                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 728                 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 729                 hostdata->sync_clock = hostdata->clock*2;
 730                 hostdata->sync_clock /= 3;
 731
 732         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 733                 /* sync divider 1, async divider 2 */
 734                 DEBUG(("53c700: sync 1 async 2\n"));
 735                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 736                 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 737                 hostdata->sync_clock = hostdata->clock;
 738         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 739                 /* sync divider 1, async divider 1.5 */
 740                 DEBUG(("53c700: sync 1 async 1.5\n"));
 741                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 742                 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
 743                 hostdata->sync_clock = hostdata->clock;
 744         } else {
 745                 DEBUG(("53c700: sync 1 async 1\n"));
 746                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 747                 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
 748                 /* sync divider 1, async divider 1 */
 749                 hostdata->sync_clock = hostdata->clock;
 750         }
 751         /* Calculate the actual minimum period that can be supported
 752          * by our synchronous clock speed.  See the 710 manual for
 753          * exact details of this calculation which is based on a
 754          * setting of the SXFER register */
 755         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 756         hostdata->min_period = NCR_700_MIN_PERIOD;
 757         if(min_period > NCR_700_MIN_PERIOD)
 758                 hostdata->min_period = min_period;
 759 }
 760
 761 STATIC void
 762 NCR_700_chip_reset(struct Scsi_Host *host)
 763 {
 764         struct NCR_700_Host_Parameters *hostdata =
 765                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 766         if(hostdata->chip710) {
 767                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 768                 udelay(100);
 769
 770                 NCR_700_writeb(0, host, ISTAT_REG);
 771         } else {
 772                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 773                 udelay(100);
 774
 775                 NCR_700_writeb(0, host, DCNTL_REG);
 776         }
 777
 778         mdelay(1000);
 779
 780         NCR_700_chip_setup(host);
 781 }
 782
 783 /* The heart of the message processing engine is that the instruction
 784  * immediately after the INT is the normal case (and so must be CLEAR
 785  * ACK).  If we want to do something else, we call that routine in
 786  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 787  * ACK) so that the routine returns correctly to resume its activity
 788  * */
 789 STATIC __u32
 790 process_extended_message(struct Scsi_Host *host,
 791                          struct NCR_700_Host_Parameters *hostdata,
 792                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 793 {
 794         __u32 resume_offset = dsp, temp = dsp + 8;
 795         __u8 pun = 0xff, lun = 0xff;
 796
 797         if(SCp != NULL) {
 798                 pun = SCp->device->id;
 799                 lun = SCp->device->lun;
 800         }
 801
 802         switch(hostdata->msgin[2]) {
 803         case A_SDTR_MSG:
 804                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 805                         struct scsi_target *starget = SCp->device->sdev_target;
 806                         __u8 period = hostdata->msgin[3];
 807                         __u8 offset = hostdata->msgin[4];
 808
 809                         if(offset == 0 || period == 0) {
 810                                 offset = 0;
 811                                 period = 0;
 812                         }
 813
 814                         spi_offset(starget) = offset;
 815                         spi_period(starget) = period;
 816
 817                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 818                                 spi_display_xfer_agreement(starget);
 819                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 820                         }
 821
 822                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 823                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 824
 825                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 826                                        host, SXFER_REG);
 827
 828                 } else {
 829                         /* SDTR message out of the blue, reject it */
 830                         shost_printk(KERN_WARNING, host,
 831                                 "Unexpected SDTR msg\n");
 832                         hostdata->msgout[0] = A_REJECT_MSG;
 833                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 834                         script_patch_16(hostdata->dev, hostdata->script,
 835                                         MessageCount, 1);
 836                         /* SendMsgOut returns, so set up the return
 837                          * address */
 838                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 839                 }
 840                 break;
 841
 842         case A_WDTR_MSG:
 843                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 844                        host->host_no, pun, lun);
 845                 hostdata->msgout[0] = A_REJECT_MSG;
 846                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 847                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 848                                 1);
 849                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 850
 851                 break;
 852
 853         default:
 854                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 855                        host->host_no, pun, lun,
 856                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 857                 spi_print_msg(hostdata->msgin);
 858                 printk("\n");
 859                 /* just reject it */
 860                 hostdata->msgout[0] = A_REJECT_MSG;
 861                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 862                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 863                                 1);
 864                 /* SendMsgOut returns, so set up the return
 865                  * address */
 866                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 867         }
 868         NCR_700_writel(temp, host, TEMP_REG);
 869         return resume_offset;
 870 }
 871
 872 STATIC __u32
 873 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 874                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 875 {
 876         /* work out where to return to */
 877         __u32 temp = dsp + 8, resume_offset = dsp;
 878         __u8 pun = 0xff, lun = 0xff;
 879
 880         if(SCp != NULL) {
 881                 pun = SCp->device->id;
 882                 lun = SCp->device->lun;
 883         }
 884
 885 #ifdef NCR_700_DEBUG
 886         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 887                NCR_700_phase[(dsps & 0xf00) >> 8]);
 888         spi_print_msg(hostdata->msgin);
 889         printk("\n");
 890 #endif
 891
 892         switch(hostdata->msgin[0]) {
 893
 894         case A_EXTENDED_MSG:
 895                 resume_offset =  process_extended_message(host, hostdata, SCp,
 896                                                           dsp, dsps);
 897                 break;
 898
 899         case A_REJECT_MSG:
 900                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 901                         /* Rejected our sync negotiation attempt */
 902                         spi_period(SCp->device->sdev_target) =
 903                                 spi_offset(SCp->device->sdev_target) = 0;
 904                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 905                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 906                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 907                         /* rejected our first simple tag message */
 908                         scmd_printk(KERN_WARNING, SCp,
 909                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 910                         /* we're done negotiating */
 911                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 912                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 913                         SCp->device->tagged_supported = 0;
 914                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
 915                 } else {
 916                         shost_printk(KERN_WARNING, host,
 917                                 "(%d:%d) Unexpected REJECT Message %s\n",
 918                                pun, lun,
 919                                NCR_700_phase[(dsps & 0xf00) >> 8]);
 920                         /* however, just ignore it */
 921                 }
 922                 break;
 923
 924         case A_PARITY_ERROR_MSG:
 925                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
 926                        pun, lun);
 927                 NCR_700_internal_bus_reset(host);
 928                 break;
 929         case A_SIMPLE_TAG_MSG:
 930                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
 931                        pun, lun, hostdata->msgin[1],
 932                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 933                 /* just ignore it */
 934                 break;
 935         default:
 936                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 937                        host->host_no, pun, lun,
 938                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 939
 940                 spi_print_msg(hostdata->msgin);
 941                 printk("\n");
 942                 /* just reject it */
 943                 hostdata->msgout[0] = A_REJECT_MSG;
 944                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 945                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 946                                 1);
 947                 /* SendMsgOut returns, so set up the return
 948                  * address */
 949                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 950
 951                 break;
 952         }
 953         NCR_700_writel(temp, host, TEMP_REG);
 954         /* set us up to receive another message */
 955         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 956         return resume_offset;
 957 }
 958
 959 STATIC __u32
 960 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 961                          struct Scsi_Host *host,
 962                          struct NCR_700_Host_Parameters *hostdata)
 963 {
 964         __u32 resume_offset = 0;
 965         __u8 pun = 0xff, lun=0xff;
 966
 967         if(SCp != NULL) {
 968                 pun = SCp->device->id;
 969                 lun = SCp->device->lun;
 970         }
 971
 972         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 973                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 974                        hostdata->status[0]));
 975                 /* OK, if TCQ still under negotiation, we now know it works */
 976                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 977                         NCR_700_set_tag_neg_state(SCp->device,
 978                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 979
 980                 /* check for contingent allegiance contitions */
 981                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 982                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 983                         struct NCR_700_command_slot *slot =
 984                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 985                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
 986                                 /* OOPS: bad device, returning another
 987                                  * contingent allegiance condition */
 988                                 scmd_printk(KERN_ERR, SCp,
 989                                         "broken device is looping in contingent allegiance: ignoring\n");
 990                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 991                         } else {
 992                                 char *cmnd =
 993                                         NCR_700_get_sense_cmnd(SCp->device);
 994 #ifdef NCR_DEBUG
 995                                 scsi_print_command(SCp);
 996                                 printk("  cmd %p has status %d, requesting sense\n",
 997                                        SCp, hostdata->status[0]);
 998 #endif
 999                                 /* we can destroy the command here
1000                                  * because the contingent allegiance
1001                                  * condition will cause a retry which
1002                                  * will re-copy the command from the
1003                                  * saved data_cmnd.  We also unmap any
1004                                  * data associated with the command
1005                                  * here */
1006                                 NCR_700_unmap(hostdata, SCp, slot);
1007                                 dma_unmap_single(hostdata->dev, slot->pCmd,
1008                                                  MAX_COMMAND_SIZE,
1009                                                  DMA_TO_DEVICE);
1010
1011                                 cmnd[0] = REQUEST_SENSE;
1012                                 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1013                                 cmnd[2] = 0;
1014                                 cmnd[3] = 0;
1015                                 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1016                                 cmnd[5] = 0;
1017                                 /* Here's a quiet hack: the
1018                                  * REQUEST_SENSE command is six bytes,
1019                                  * so store a flag indicating that
1020                                  * this was an internal sense request
1021                                  * and the original status at the end
1022                                  * of the command */
1023                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1024                                 cmnd[7] = hostdata->status[0];
1025                                 cmnd[8] = SCp->cmd_len;
1026                                 SCp->cmd_len = 6; /* command length for
1027                                                    * REQUEST_SENSE */
1028                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1029                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1030                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1031                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1032                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1033                                 slot->SG[1].pAddr = 0;
1034                                 slot->resume_offset = hostdata->pScript;
1035                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1036                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1037
1038                                 /* queue the command for reissue */
1039                                 slot->state = NCR_700_SLOT_QUEUED;
1040                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1041                                 hostdata->state = NCR_700_HOST_FREE;
1042                                 hostdata->cmd = NULL;
1043                         }
1044                 } else {
1045                         // Currently rely on the mid layer evaluation
1046                         // of the tag queuing capability
1047                         //
1048                         //if(status_byte(hostdata->status[0]) == GOOD &&
1049                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1050                         //      /* Piggy back the tag queueing support
1051                         //       * on this command */
1052                         //      dma_sync_single_for_cpu(hostdata->dev,
1053                         //                          slot->dma_handle,
1054                         //                          SCp->request_bufflen,
1055                         //                          DMA_FROM_DEVICE);
1056                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1057                         //              scmd_printk(KERN_INFO, SCp,
1058                         //                   "Enabling Tag Command Queuing\n");
1059                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1060                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1061                         //      } else {
1062                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1063                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1064                         //      }
1065                         //}
1066                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1067                 }
1068         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1069                 __u8 i = (dsps & 0xf00) >> 8;
1070
1071                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1072                        NCR_700_phase[i],
1073                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1074                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1075                         SCp->cmd_len);
1076                 scsi_print_command(SCp);
1077
1078                 NCR_700_internal_bus_reset(host);
1079         } else if((dsps & 0xfffff000) == A_FATAL) {
1080                 int i = (dsps & 0xfff);
1081
1082                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1083                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1084                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1085                         printk(KERN_ERR "     msg begins %02x %02x\n",
1086                                hostdata->msgin[0], hostdata->msgin[1]);
1087                 }
1088                 NCR_700_internal_bus_reset(host);
1089         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1090 #ifdef NCR_700_DEBUG
1091                 __u8 i = (dsps & 0xf00) >> 8;
1092
1093                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1094                        host->host_no, pun, lun,
1095                        i, NCR_700_phase[i]);
1096 #endif
1097                 save_for_reselection(hostdata, SCp, dsp);
1098
1099         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1100                 __u8 lun;
1101                 struct NCR_700_command_slot *slot;
1102                 __u8 reselection_id = hostdata->reselection_id;
1103                 struct scsi_device *SDp;
1104
1105                 lun = hostdata->msgin[0] & 0x1f;
1106
1107                 hostdata->reselection_id = 0xff;
1108                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1109                        host->host_no, reselection_id, lun));
1110                 /* clear the reselection indicator */
1111                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1112                 if(unlikely(SDp == NULL)) {
1113                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1114                                host->host_no, reselection_id, lun);
1115                         BUG();
1116                 }
1117                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1118                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1119                         if(unlikely(SCp == NULL)) {
1120                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1121                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1122                                 BUG();
1123                         }
1124
1125                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1126                         DDEBUG(KERN_DEBUG, SDp,
1127                                 "reselection is tag %d, slot %p(%d)\n",
1128                                 hostdata->msgin[2], slot, slot->tag);
1129                 } else {
1130                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1131                         if(unlikely(SCp == NULL)) {
1132                                 sdev_printk(KERN_ERR, SDp,
1133                                         "no saved request for untagged cmd\n");
1134                                 BUG();
1135                         }
1136                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1137                 }
1138
1139                 if(slot == NULL) {
1140                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1141                                host->host_no, reselection_id, lun,
1142                                hostdata->msgin[0], hostdata->msgin[1],
1143                                hostdata->msgin[2]);
1144                 } else {
1145                         if(hostdata->state != NCR_700_HOST_BUSY)
1146                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1147                                        host->host_no);
1148                         resume_offset = slot->resume_offset;
1149                         hostdata->cmd = slot->cmnd;
1150
1151                         /* re-patch for this command */
1152                         script_patch_32_abs(hostdata->dev, hostdata->script,
1153                                             CommandAddress, slot->pCmd);
1154                         script_patch_16(hostdata->dev, hostdata->script,
1155                                         CommandCount, slot->cmnd->cmd_len);
1156                         script_patch_32_abs(hostdata->dev, hostdata->script,
1157                                             SGScriptStartAddress,
1158                                             to32bit(&slot->pSG[0].ins));
1159
1160                         /* Note: setting SXFER only works if we're
1161                          * still in the MESSAGE phase, so it is vital
1162                          * that ACK is still asserted when we process
1163                          * the reselection message.  The resume offset
1164                          * should therefore always clear ACK */
1165                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1166                                        host, SXFER_REG);
1167                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1168                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1169                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1170                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1171                         /* I'm just being paranoid here, the command should
1172                          * already have been flushed from the cache */
1173                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1174                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1175
1176
1177
1178                 }
1179         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1180
1181                 /* This section is full of debugging code because I've
1182                  * never managed to reach it.  I think what happens is
1183                  * that, because the 700 runs with selection
1184                  * interrupts enabled the whole time that we take a
1185                  * selection interrupt before we manage to get to the
1186                  * reselected script interrupt */
1187
1188                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1189                 struct NCR_700_command_slot *slot;
1190
1191                 /* Take out our own ID */
1192                 reselection_id &= ~(1<<host->this_id);
1193
1194                 /* I've never seen this happen, so keep this as a printk rather
1195                  * than a debug */
1196                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1197                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1198
1199                 {
1200                         /* FIXME: DEBUGGING CODE */
1201                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1202                         int i;
1203
1204                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1205                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1206                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1207                                         break;
1208                         }
1209                         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);
1210                         SCp =  hostdata->slots[i].cmnd;
1211                 }
1212
1213                 if(SCp != NULL) {
1214                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1215                         /* change slot from busy to queued to redo command */
1216                         slot->state = NCR_700_SLOT_QUEUED;
1217                 }
1218                 hostdata->cmd = NULL;
1219
1220                 if(reselection_id == 0) {
1221                         if(hostdata->reselection_id == 0xff) {
1222                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1223                                 return 0;
1224                         } else {
1225                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1226                                        host->host_no);
1227                                 reselection_id = hostdata->reselection_id;
1228                         }
1229                 } else {
1230
1231                         /* convert to real ID */
1232                         reselection_id = bitmap_to_number(reselection_id);
1233                 }
1234                 hostdata->reselection_id = reselection_id;
1235                 /* just in case we have a stale simple tag message, clear it */
1236                 hostdata->msgin[1] = 0;
1237                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1238                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1239                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1240                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1241                 } else {
1242                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1243                 }
1244         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1245                 /* we've just disconnected from the bus, do nothing since
1246                  * a return here will re-run the queued command slot
1247                  * that may have been interrupted by the initial selection */
1248                 DEBUG((" SELECTION COMPLETED\n"));
1249         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1250                 resume_offset = process_message(host, hostdata, SCp,
1251                                                 dsp, dsps);
1252         } else if((dsps &  0xfffff000) == 0) {
1253                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1254                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1255                        host->host_no, pun, lun, NCR_700_condition[i],
1256                        NCR_700_phase[j], dsp - hostdata->pScript);
1257                 if(SCp != NULL) {
1258                         struct scatterlist *sg;
1259
1260                         scsi_print_command(SCp);
1261                         scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1262                                 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);
1263                         }
1264                 }
1265                 NCR_700_internal_bus_reset(host);
1266         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1267                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1268                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1269                 resume_offset = dsp;
1270         } else {
1271                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1272                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1273                 NCR_700_internal_bus_reset(host);
1274         }
1275         return resume_offset;
1276 }
1277
1278 /* We run the 53c700 with selection interrupts always enabled.  This
1279  * means that the chip may be selected as soon as the bus frees.  On a
1280  * busy bus, this can be before the scripts engine finishes its
1281  * processing.  Therefore, part of the selection processing has to be
1282  * to find out what the scripts engine is doing and complete the
1283  * function if necessary (i.e. process the pending disconnect or save
1284  * the interrupted initial selection */
1285 STATIC inline __u32
1286 process_selection(struct Scsi_Host *host, __u32 dsp)
1287 {
1288         __u8 id = 0;    /* Squash compiler warning */
1289         int count = 0;
1290         __u32 resume_offset = 0;
1291         struct NCR_700_Host_Parameters *hostdata =
1292                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1293         struct scsi_cmnd *SCp = hostdata->cmd;
1294         __u8 sbcl;
1295
1296         for(count = 0; count < 5; count++) {
1297                 id = NCR_700_readb(host, hostdata->chip710 ?
1298                                    CTEST9_REG : SFBR_REG);
1299
1300                 /* Take out our own ID */
1301                 id &= ~(1<<host->this_id);
1302                 if(id != 0)
1303                         break;
1304                 udelay(5);
1305         }
1306         sbcl = NCR_700_readb(host, SBCL_REG);
1307         if((sbcl & SBCL_IO) == 0) {
1308                 /* mark as having been selected rather than reselected */
1309                 id = 0xff;
1310         } else {
1311                 /* convert to real ID */
1312                 hostdata->reselection_id = id = bitmap_to_number(id);
1313                 DEBUG(("scsi%d:  Reselected by %d\n",
1314                        host->host_no, id));
1315         }
1316         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1317                 struct NCR_700_command_slot *slot =
1318                         (struct NCR_700_command_slot *)SCp->host_scribble;
1319                 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));
1320
1321                 switch(dsp - hostdata->pScript) {
1322                 case Ent_Disconnect1:
1323                 case Ent_Disconnect2:
1324                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1325                         break;
1326                 case Ent_Disconnect3:
1327                 case Ent_Disconnect4:
1328                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1329                         break;
1330                 case Ent_Disconnect5:
1331                 case Ent_Disconnect6:
1332                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1333                         break;
1334                 case Ent_Disconnect7:
1335                 case Ent_Disconnect8:
1336                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1337                         break;
1338                 case Ent_Finish1:
1339                 case Ent_Finish2:
1340                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1341                         break;
1342
1343                 default:
1344                         slot->state = NCR_700_SLOT_QUEUED;
1345                         break;
1346                         }
1347         }
1348         hostdata->state = NCR_700_HOST_BUSY;
1349         hostdata->cmd = NULL;
1350         /* clear any stale simple tag message */
1351         hostdata->msgin[1] = 0;
1352         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1353                        DMA_BIDIRECTIONAL);
1354
1355         if(id == 0xff) {
1356                 /* Selected as target, Ignore */
1357                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1358         } else if(hostdata->tag_negotiated & (1<<id)) {
1359                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1360         } else {
1361                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1362         }
1363         return resume_offset;
1364 }
1365
1366 static inline void
1367 NCR_700_clear_fifo(struct Scsi_Host *host) {
1368         const struct NCR_700_Host_Parameters *hostdata
1369                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1370         if(hostdata->chip710) {
1371                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1372         } else {
1373                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1374         }
1375 }
1376
1377 static inline void
1378 NCR_700_flush_fifo(struct Scsi_Host *host) {
1379         const struct NCR_700_Host_Parameters *hostdata
1380                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1381         if(hostdata->chip710) {
1382                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1383                 udelay(10);
1384                 NCR_700_writeb(0, host, CTEST8_REG);
1385         } else {
1386                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1387                 udelay(10);
1388                 NCR_700_writeb(0, host, DFIFO_REG);
1389         }
1390 }
1391
1392
1393 /* The queue lock with interrupts disabled must be held on entry to
1394  * this function */
1395 STATIC int
1396 NCR_700_start_command(struct scsi_cmnd *SCp)
1397 {
1398         struct NCR_700_command_slot *slot =
1399                 (struct NCR_700_command_slot *)SCp->host_scribble;
1400         struct NCR_700_Host_Parameters *hostdata =
1401                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1402         __u16 count = 1;        /* for IDENTIFY message */
1403
1404         if(hostdata->state != NCR_700_HOST_FREE) {
1405                 /* keep this inside the lock to close the race window where
1406                  * the running command finishes on another CPU while we don't
1407                  * change the state to queued on this one */
1408                 slot->state = NCR_700_SLOT_QUEUED;
1409
1410                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1411                        SCp->device->host->host_no, slot->cmnd, slot));
1412                 return 0;
1413         }
1414         hostdata->state = NCR_700_HOST_BUSY;
1415         hostdata->cmd = SCp;
1416         slot->state = NCR_700_SLOT_BUSY;
1417         /* keep interrupts disabled until we have the command correctly
1418          * set up so we cannot take a selection interrupt */
1419
1420         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1421                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1422                                                SCp->device->lun);
1423         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1424          * if the negotiated transfer parameters still hold, so
1425          * always renegotiate them */
1426         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1427            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1428                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1429         }
1430
1431         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1432          * If a contingent allegiance condition exists, the device
1433          * will refuse all tags, so send the request sense as untagged
1434          * */
1435         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1436            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1437                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1438                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1439         }
1440
1441         if(hostdata->fast &&
1442            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1443                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1444                                 spi_period(SCp->device->sdev_target),
1445                                 spi_offset(SCp->device->sdev_target));
1446                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1447         }
1448
1449         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1450
1451
1452         script_patch_ID(hostdata->dev, hostdata->script,
1453                         Device_ID, 1<<scmd_id(SCp));
1454
1455         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1456                             slot->pCmd);
1457         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1458                         SCp->cmd_len);
1459         /* finally plumb the beginning of the SG list into the script
1460          * */
1461         script_patch_32_abs(hostdata->dev, hostdata->script,
1462                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1463         NCR_700_clear_fifo(SCp->device->host);
1464
1465         if(slot->resume_offset == 0)
1466                 slot->resume_offset = hostdata->pScript;
1467         /* now perform all the writebacks and invalidates */
1468         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1469         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1470                        DMA_FROM_DEVICE);
1471         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1472         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1473
1474         /* set the synchronous period/offset */
1475         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1476                        SCp->device->host, SXFER_REG);
1477         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1478         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1479
1480         return 1;
1481 }
1482
1483 irqreturn_t
1484 NCR_700_intr(int irq, void *dev_id)
1485 {
1486         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1487         struct NCR_700_Host_Parameters *hostdata =
1488                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1489         __u8 istat;
1490         __u32 resume_offset = 0;
1491         __u8 pun = 0xff, lun = 0xff;
1492         unsigned long flags;
1493         int handled = 0;
1494
1495         /* Use the host lock to serialise access to the 53c700
1496          * hardware.  Note: In future, we may need to take the queue
1497          * lock to enter the done routines.  When that happens, we
1498          * need to ensure that for this driver, the host lock and the
1499          * queue lock point to the same thing. */
1500         spin_lock_irqsave(host->host_lock, flags);
1501         if((istat = NCR_700_readb(host, ISTAT_REG))
1502               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1503                 __u32 dsps;
1504                 __u8 sstat0 = 0, dstat = 0;
1505                 __u32 dsp;
1506                 struct scsi_cmnd *SCp = hostdata->cmd;
1507                 enum NCR_700_Host_State state;
1508
1509                 handled = 1;
1510                 state = hostdata->state;
1511                 SCp = hostdata->cmd;
1512
1513                 if(istat & SCSI_INT_PENDING) {
1514                         udelay(10);
1515
1516                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1517                 }
1518
1519                 if(istat & DMA_INT_PENDING) {
1520                         udelay(10);
1521
1522                         dstat = NCR_700_readb(host, DSTAT_REG);
1523                 }
1524
1525                 dsps = NCR_700_readl(host, DSPS_REG);
1526                 dsp = NCR_700_readl(host, DSP_REG);
1527
1528                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1529                        host->host_no, istat, sstat0, dstat,
1530                        (dsp - (__u32)(hostdata->pScript))/4,
1531                        dsp, dsps));
1532
1533                 if(SCp != NULL) {
1534                         pun = SCp->device->id;
1535                         lun = SCp->device->lun;
1536                 }
1537
1538                 if(sstat0 & SCSI_RESET_DETECTED) {
1539                         struct scsi_device *SDp;
1540                         int i;
1541
1542                         hostdata->state = NCR_700_HOST_BUSY;
1543
1544                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1545                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1546
1547                         scsi_report_bus_reset(host, 0);
1548
1549                         /* clear all the negotiated parameters */
1550                         __shost_for_each_device(SDp, host)
1551                                 NCR_700_clear_flag(SDp, ~0);
1552
1553                         /* clear all the slots and their pending commands */
1554                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1555                                 struct scsi_cmnd *SCp;
1556                                 struct NCR_700_command_slot *slot =
1557                                         &hostdata->slots[i];
1558
1559                                 if(slot->state == NCR_700_SLOT_FREE)
1560                                         continue;
1561
1562                                 SCp = slot->cmnd;
1563                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1564                                        slot, SCp);
1565                                 free_slot(slot, hostdata);
1566                                 SCp->host_scribble = NULL;
1567                                 NCR_700_set_depth(SCp->device, 0);
1568                                 /* NOTE: deadlock potential here: we
1569                                  * rely on mid-layer guarantees that
1570                                  * scsi_done won't try to issue the
1571                                  * command again otherwise we'll
1572                                  * deadlock on the
1573                                  * hostdata->state_lock */
1574                                 SCp->result = DID_RESET << 16;
1575                                 SCp->scsi_done(SCp);
1576                         }
1577                         mdelay(25);
1578                         NCR_700_chip_setup(host);
1579
1580                         hostdata->state = NCR_700_HOST_FREE;
1581                         hostdata->cmd = NULL;
1582                         /* signal back if this was an eh induced reset */
1583                         if(hostdata->eh_complete != NULL)
1584                                 complete(hostdata->eh_complete);
1585                         goto out_unlock;
1586                 } else if(sstat0 & SELECTION_TIMEOUT) {
1587                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1588                                host->host_no, pun, lun));
1589                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1590                 } else if(sstat0 & PHASE_MISMATCH) {
1591                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1592                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1593
1594                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1595                                 /* It wants to reply to some part of
1596                                  * our message */
1597 #ifdef NCR_700_DEBUG
1598                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1599                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1600                                 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)));
1601 #endif
1602                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1603                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1604                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1605                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1606                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1607                                 int residual = NCR_700_data_residual(host);
1608                                 int i;
1609 #ifdef NCR_700_DEBUG
1610                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1611
1612                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1613                                        host->host_no, pun, lun,
1614                                        SGcount, data_transfer);
1615                                 scsi_print_command(SCp);
1616                                 if(residual) {
1617                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1618                                        host->host_no, pun, lun,
1619                                        SGcount, data_transfer, residual);
1620                                 }
1621 #endif
1622                                 data_transfer += residual;
1623
1624                                 if(data_transfer != 0) {
1625                                         int count;
1626                                         __u32 pAddr;
1627
1628                                         SGcount--;
1629
1630                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1631                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1632                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1633                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1634                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1635                                         pAddr += (count - data_transfer);
1636 #ifdef NCR_700_DEBUG
1637                                         if(pAddr != naddr) {
1638                                                 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);
1639                                         }
1640 #endif
1641                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1642                                 }
1643                                 /* set the executed moves to nops */
1644                                 for(i=0; i<SGcount; i++) {
1645                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1646                                         slot->SG[i].pAddr = 0;
1647                                 }
1648                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1649                                 /* and pretend we disconnected after
1650                                  * the command phase */
1651                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1652                                 /* make sure all the data is flushed */
1653                                 NCR_700_flush_fifo(host);
1654                         } else {
1655                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1656                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1657                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1658                                 NCR_700_internal_bus_reset(host);
1659                         }
1660
1661                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1662                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1663                                host->host_no, pun, lun);
1664                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665                 } else if(sstat0 & PARITY_ERROR) {
1666                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1667                                host->host_no, pun, lun);
1668                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1669                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1670                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1671                                host->host_no, pun, lun));
1672                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1673                 } else if(dstat & (ILGL_INST_DETECTED)) {
1674                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1675                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1676                                host->host_no, pun, lun,
1677                                dsp, dsp - hostdata->pScript);
1678                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1680                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1681                                host->host_no, pun, lun, dstat);
1682                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1683                 }
1684
1685
1686                 /* NOTE: selection interrupt processing MUST occur
1687                  * after script interrupt processing to correctly cope
1688                  * with the case where we process a disconnect and
1689                  * then get reselected before we process the
1690                  * disconnection */
1691                 if(sstat0 & SELECTED) {
1692                         /* FIXME: It currently takes at least FOUR
1693                          * interrupts to complete a command that
1694                          * disconnects: one for the disconnect, one
1695                          * for the reselection, one to get the
1696                          * reselection data and one to complete the
1697                          * command.  If we guess the reselected
1698                          * command here and prepare it, we only need
1699                          * to get a reselection data interrupt if we
1700                          * guessed wrongly.  Since the interrupt
1701                          * overhead is much greater than the command
1702                          * setup, this would be an efficient
1703                          * optimisation particularly as we probably
1704                          * only have one outstanding command on a
1705                          * target most of the time */
1706
1707                         resume_offset = process_selection(host, dsp);
1708
1709                 }
1710
1711         }
1712
1713         if(resume_offset) {
1714                 if(hostdata->state != NCR_700_HOST_BUSY) {
1715                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1716                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1717                         hostdata->state = NCR_700_HOST_BUSY;
1718                 }
1719
1720                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1721                 NCR_700_clear_fifo(host);
1722                 NCR_700_writel(resume_offset, host, DSP_REG);
1723         }
1724         /* There is probably a technical no-no about this: If we're a
1725          * shared interrupt and we got this interrupt because the
1726          * other device needs servicing not us, we're still going to
1727          * check our queued commands here---of course, there shouldn't
1728          * be any outstanding.... */
1729         if(hostdata->state == NCR_700_HOST_FREE) {
1730                 int i;
1731
1732                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1733                         /* fairness: always run the queue from the last
1734                          * position we left off */
1735                         int j = (i + hostdata->saved_slot_position)
1736                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1737
1738                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1739                                 continue;
1740                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1741                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1742                                        host->host_no, &hostdata->slots[j],
1743                                        hostdata->slots[j].cmnd));
1744                                 hostdata->saved_slot_position = j + 1;
1745                         }
1746
1747                         break;
1748                 }
1749         }
1750  out_unlock:
1751         spin_unlock_irqrestore(host->host_lock, flags);
1752         return IRQ_RETVAL(handled);
1753 }
1754
1755 STATIC int
1756 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1757 {
1758         struct NCR_700_Host_Parameters *hostdata =
1759                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1760         __u32 move_ins;
1761         enum dma_data_direction direction;
1762         struct NCR_700_command_slot *slot;
1763
1764         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1765                 /* We're over our allocation, this should never happen
1766                  * since we report the max allocation to the mid layer */
1767                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1768                 return 1;
1769         }
1770         /* check for untagged commands.  We cannot have any outstanding
1771          * commands if we accept them.  Commands could be untagged because:
1772          *
1773          * - The tag negotiated bitmap is clear
1774          * - The blk layer sent and untagged command
1775          */
1776         if(NCR_700_get_depth(SCp->device) != 0
1777            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1778                || !blk_rq_tagged(SCp->request))) {
1779                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1780                        NCR_700_get_depth(SCp->device));
1781                 return SCSI_MLQUEUE_DEVICE_BUSY;
1782         }
1783         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1784                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1785                        NCR_700_get_depth(SCp->device));
1786                 return SCSI_MLQUEUE_DEVICE_BUSY;
1787         }
1788         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1789
1790         /* begin the command here */
1791         /* no need to check for NULL, test for command_slot_count above
1792          * ensures a slot is free */
1793         slot = find_empty_slot(hostdata);
1794
1795         slot->cmnd = SCp;
1796
1797         SCp->scsi_done = done;
1798         SCp->host_scribble = (unsigned char *)slot;
1799         SCp->SCp.ptr = NULL;
1800         SCp->SCp.buffer = NULL;
1801
1802 #ifdef NCR_700_DEBUG
1803         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1804         scsi_print_command(SCp);
1805 #endif
1806         if(blk_rq_tagged(SCp->request)
1807            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1808            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1809                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1810                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1811                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1812         }
1813
1814         /* here we may have to process an untagged command.  The gate
1815          * above ensures that this will be the only one outstanding,
1816          * so clear the tag negotiated bit.
1817          *
1818          * FIXME: This will royally screw up on multiple LUN devices
1819          * */
1820         if(!blk_rq_tagged(SCp->request)
1821            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1822                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1823                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1824         }
1825
1826         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1827            && scsi_get_tag_type(SCp->device)) {
1828                 slot->tag = SCp->request->tag;
1829                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1830                        slot->tag, slot);
1831         } else {
1832                 slot->tag = SCSI_NO_TAG;
1833                 /* must populate current_cmnd for scsi_find_tag to work */
1834                 SCp->device->current_cmnd = SCp;
1835         }
1836         /* sanity check: some of the commands generated by the mid-layer
1837          * have an eccentric idea of their sc_data_direction */
1838         if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1839            SCp->sc_data_direction != DMA_NONE) {
1840 #ifdef NCR_700_DEBUG
1841                 printk("53c700: Command");
1842                 scsi_print_command(SCp);
1843                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1844 #endif
1845                 SCp->sc_data_direction = DMA_NONE;
1846         }
1847
1848         switch (SCp->cmnd[0]) {
1849         case REQUEST_SENSE:
1850                 /* clear the internal sense magic */
1851                 SCp->cmnd[6] = 0;
1852                 /* fall through */
1853         default:
1854                 /* OK, get it from the command */
1855                 switch(SCp->sc_data_direction) {
1856                 case DMA_BIDIRECTIONAL:
1857                 default:
1858                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1859                         scsi_print_command(SCp);
1860
1861                         move_ins = 0;
1862                         break;
1863                 case DMA_NONE:
1864                         move_ins = 0;
1865                         break;
1866                 case DMA_FROM_DEVICE:
1867                         move_ins = SCRIPT_MOVE_DATA_IN;
1868                         break;
1869                 case DMA_TO_DEVICE:
1870                         move_ins = SCRIPT_MOVE_DATA_OUT;
1871                         break;
1872                 }
1873         }
1874
1875         /* now build the scatter gather list */
1876         direction = SCp->sc_data_direction;
1877         if(move_ins != 0) {
1878                 int i;
1879                 int sg_count;
1880                 dma_addr_t vPtr = 0;
1881                 struct scatterlist *sg;
1882                 __u32 count = 0;
1883
1884                 sg_count = scsi_dma_map(SCp);
1885                 BUG_ON(sg_count < 0);
1886
1887                 scsi_for_each_sg(SCp, sg, sg_count, i) {
1888                         vPtr = sg_dma_address(sg);
1889                         count = sg_dma_len(sg);
1890
1891                         slot->SG[i].ins = bS_to_host(move_ins | count);
1892                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1893                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1894                         slot->SG[i].pAddr = bS_to_host(vPtr);
1895                 }
1896                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1897                 slot->SG[i].pAddr = 0;
1898                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1899                 DEBUG((" SETTING %08lx to %x\n",
1900                        (&slot->pSG[i].ins),
1901                        slot->SG[i].ins));
1902         }
1903         slot->resume_offset = 0;
1904         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1905                                     MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1906         NCR_700_start_command(SCp);
1907         return 0;
1908 }
1909
1910 STATIC int
1911 NCR_700_abort(struct scsi_cmnd * SCp)
1912 {
1913         struct NCR_700_command_slot *slot;
1914
1915         scmd_printk(KERN_INFO, SCp,
1916                 "New error handler wants to abort command\n\t");
1917         scsi_print_command(SCp);
1918
1919         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1920
1921         if(slot == NULL)
1922                 /* no outstanding command to abort */
1923                 return SUCCESS;
1924         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1925                 /* FIXME: This is because of a problem in the new
1926                  * error handler.  When it is in error recovery, it
1927                  * will send a TUR to a device it thinks may still be
1928                  * showing a problem.  If the TUR isn't responded to,
1929                  * it will abort it and mark the device off line.
1930                  * Unfortunately, it does no other error recovery, so
1931                  * this would leave us with an outstanding command
1932                  * occupying a slot.  Rather than allow this to
1933                  * happen, we issue a bus reset to force all
1934                  * outstanding commands to terminate here. */
1935                 NCR_700_internal_bus_reset(SCp->device->host);
1936                 /* still drop through and return failed */
1937         }
1938         return FAILED;
1939
1940 }
1941
1942 STATIC int
1943 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1944 {
1945         DECLARE_COMPLETION_ONSTACK(complete);
1946         struct NCR_700_Host_Parameters *hostdata =
1947                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1948
1949         scmd_printk(KERN_INFO, SCp,
1950                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1951         scsi_print_command(SCp);
1952
1953         /* In theory, eh_complete should always be null because the
1954          * eh is single threaded, but just in case we're handling a
1955          * reset via sg or something */
1956         spin_lock_irq(SCp->device->host->host_lock);
1957         while (hostdata->eh_complete != NULL) {
1958                 spin_unlock_irq(SCp->device->host->host_lock);
1959                 msleep_interruptible(100);
1960                 spin_lock_irq(SCp->device->host->host_lock);
1961         }
1962
1963         hostdata->eh_complete = &complete;
1964         NCR_700_internal_bus_reset(SCp->device->host);
1965
1966         spin_unlock_irq(SCp->device->host->host_lock);
1967         wait_for_completion(&complete);
1968         spin_lock_irq(SCp->device->host->host_lock);
1969
1970         hostdata->eh_complete = NULL;
1971         /* Revalidate the transport parameters of the failing device */
1972         if(hostdata->fast)
1973                 spi_schedule_dv_device(SCp->device);
1974
1975         spin_unlock_irq(SCp->device->host->host_lock);
1976         return SUCCESS;
1977 }
1978
1979 STATIC int
1980 NCR_700_host_reset(struct scsi_cmnd * SCp)
1981 {
1982         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1983         scsi_print_command(SCp);
1984
1985         spin_lock_irq(SCp->device->host->host_lock);
1986
1987         NCR_700_internal_bus_reset(SCp->device->host);
1988         NCR_700_chip_reset(SCp->device->host);
1989
1990         spin_unlock_irq(SCp->device->host->host_lock);
1991
1992         return SUCCESS;
1993 }
1994
1995 STATIC void
1996 NCR_700_set_period(struct scsi_target *STp, int period)
1997 {
1998         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1999         struct NCR_700_Host_Parameters *hostdata =
2000                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2001
2002         if(!hostdata->fast)
2003                 return;
2004
2005         if(period < hostdata->min_period)
2006                 period = hostdata->min_period;
2007
2008         spi_period(STp) = period;
2009         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2010                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2011         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2012 }
2013
2014 STATIC void
2015 NCR_700_set_offset(struct scsi_target *STp, int offset)
2016 {
2017         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2018         struct NCR_700_Host_Parameters *hostdata =
2019                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2020         int max_offset = hostdata->chip710
2021                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2022
2023         if(!hostdata->fast)
2024                 return;
2025
2026         if(offset > max_offset)
2027                 offset = max_offset;
2028
2029         /* if we're currently async, make sure the period is reasonable */
2030         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2031                                     spi_period(STp) > 0xff))
2032                 spi_period(STp) = hostdata->min_period;
2033
2034         spi_offset(STp) = offset;
2035         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2036                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2037         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2038 }
2039
2040 STATIC int
2041 NCR_700_slave_alloc(struct scsi_device *SDp)
2042 {
2043         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2044                                 GFP_KERNEL);
2045
2046         if (!SDp->hostdata)
2047                 return -ENOMEM;
2048
2049         return 0;
2050 }
2051
2052 STATIC int
2053 NCR_700_slave_configure(struct scsi_device *SDp)
2054 {
2055         struct NCR_700_Host_Parameters *hostdata =
2056                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2057
2058         /* to do here: allocate memory; build a queue_full list */
2059         if(SDp->tagged_supported) {
2060                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2061                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2062                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2063         } else {
2064                 /* initialise to default depth */
2065                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2066         }
2067         if(hostdata->fast) {
2068                 /* Find the correct offset and period via domain validation */
2069                 if (!spi_initial_dv(SDp->sdev_target))
2070                         spi_dv_device(SDp);
2071         } else {
2072                 spi_offset(SDp->sdev_target) = 0;
2073                 spi_period(SDp->sdev_target) = 0;
2074         }
2075         return 0;
2076 }
2077
2078 STATIC void
2079 NCR_700_slave_destroy(struct scsi_device *SDp)
2080 {
2081         kfree(SDp->hostdata);
2082         SDp->hostdata = NULL;
2083 }
2084
2085 static int
2086 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
2087 {
2088         if (reason != SCSI_QDEPTH_DEFAULT)
2089                 return -EOPNOTSUPP;
2090
2091         if (depth > NCR_700_MAX_TAGS)
2092                 depth = NCR_700_MAX_TAGS;
2093
2094         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2095         return depth;
2096 }
2097
2098 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2099 {
2100         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2101                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2102         struct NCR_700_Host_Parameters *hostdata =
2103                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2104
2105         scsi_set_tag_type(SDp, tag_type);
2106
2107         /* We have a global (per target) flag to track whether TCQ is
2108          * enabled, so we'll be turning it off for the entire target here.
2109          * our tag algorithm will fail if we mix tagged and untagged commands,
2110          * so quiesce the device before doing this */
2111         if (change_tag)
2112                 scsi_target_quiesce(SDp->sdev_target);
2113
2114         if (!tag_type) {
2115                 /* shift back to the default unqueued number of commands
2116                  * (the user can still raise this) */
2117                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2118                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2119         } else {
2120                 /* Here, we cleared the negotiation flag above, so this
2121                  * will force the driver to renegotiate */
2122                 scsi_activate_tcq(SDp, SDp->queue_depth);
2123                 if (change_tag)
2124                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2125         }
2126         if (change_tag)
2127                 scsi_target_resume(SDp->sdev_target);
2128
2129         return tag_type;
2130 }
2131
2132 static ssize_t
2133 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2134 {
2135         struct scsi_device *SDp = to_scsi_device(dev);
2136
2137         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2138 }
2139
2140 static struct device_attribute NCR_700_active_tags_attr = {
2141         .attr = {
2142                 .name =         "active_tags",
2143                 .mode =         S_IRUGO,
2144         },
2145         .show = NCR_700_show_active_tags,
2146 };
2147
2148 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2149         &NCR_700_active_tags_attr,
2150         NULL,
2151 };
2152
2153 EXPORT_SYMBOL(NCR_700_detect);
2154 EXPORT_SYMBOL(NCR_700_release);
2155 EXPORT_SYMBOL(NCR_700_intr);
2156
2157 static struct spi_function_template NCR_700_transport_functions =  {
2158         .set_period     = NCR_700_set_period,
2159         .show_period    = 1,
2160         .set_offset     = NCR_700_set_offset,
2161         .show_offset    = 1,
2162 };
2163
2164 static int __init NCR_700_init(void)
2165 {
2166         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2167         if(!NCR_700_transport_template)
2168                 return -ENODEV;
2169         return 0;
2170 }
2171
2172 static void __exit NCR_700_exit(void)
2173 {
2174         spi_release_transport(NCR_700_transport_template);
2175 }
2176
2177 module_init(NCR_700_init);
2178 module_exit(NCR_700_exit);
2179