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/ioport.h>
 121 #include <linux/delay.h>
 122 #include <linux/spinlock.h>
 123 #include <linux/completion.h>
 124 #include <linux/init.h>
 125 #include <linux/proc_fs.h>
 126 #include <linux/blkdev.h>
 127 #include <linux/module.h>
 128 #include <linux/interrupt.h>
 129 #include <linux/device.h>
 130 #include <asm/dma.h>
 131 #include <asm/system.h>
 132 #include <asm/io.h>
 133 #include <asm/pgtable.h>
 134 #include <asm/byteorder.h>
 135
 136 #include <scsi/scsi.h>
 137 #include <scsi/scsi_cmnd.h>
 138 #include <scsi/scsi_dbg.h>
 139 #include <scsi/scsi_eh.h>
 140 #include <scsi/scsi_host.h>
 141 #include <scsi/scsi_tcq.h>
 142 #include <scsi/scsi_transport.h>
 143 #include <scsi/scsi_transport_spi.h>
 144
 145 #include "53c700.h"
 146
 147 /* NOTE: For 64 bit drivers there are points in the code where we use
 148  * a non dereferenceable pointer to point to a structure in dma-able
 149  * memory (which is 32 bits) so that we can use all of the structure
 150  * operations but take the address at the end.  This macro allows us
 151  * to truncate the 64 bit pointer down to 32 bits without the compiler
 152  * complaining */
 153 #define to32bit(x)      ((__u32)((unsigned long)(x)))
 154
 155 #ifdef NCR_700_DEBUG
 156 #define STATIC
 157 #else
 158 #define STATIC static
 159 #endif
 160
 161 MODULE_AUTHOR("James Bottomley");
 162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
 163 MODULE_LICENSE("GPL");
 164
 165 /* This is the script */
 166 #include "53c700_d.h"
 167
 168
 169 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
 170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
 171 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
 172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
 173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
 174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
 175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
 176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
 177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
 178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
 179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
 180
 181 STATIC struct device_attribute *NCR_700_dev_attrs[];
 182
 183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
 184
 185 static char *NCR_700_phase[] = {
 186         "",
 187         "after selection",
 188         "before command phase",
 189         "after command phase",
 190         "after status phase",
 191         "after data in phase",
 192         "after data out phase",
 193         "during data phase",
 194 };
 195
 196 static char *NCR_700_condition[] = {
 197         "",
 198         "NOT MSG_OUT",
 199         "UNEXPECTED PHASE",
 200         "NOT MSG_IN",
 201         "UNEXPECTED MSG",
 202         "MSG_IN",
 203         "SDTR_MSG RECEIVED",
 204         "REJECT_MSG RECEIVED",
 205         "DISCONNECT_MSG RECEIVED",
 206         "MSG_OUT",
 207         "DATA_IN",
 208
 209 };
 210
 211 static char *NCR_700_fatal_messages[] = {
 212         "unexpected message after reselection",
 213         "still MSG_OUT after message injection",
 214         "not MSG_IN after selection",
 215         "Illegal message length received",
 216 };
 217
 218 static char *NCR_700_SBCL_bits[] = {
 219         "IO ",
 220         "CD ",
 221         "MSG ",
 222         "ATN ",
 223         "SEL ",
 224         "BSY ",
 225         "ACK ",
 226         "REQ ",
 227 };
 228
 229 static char *NCR_700_SBCL_to_phase[] = {
 230         "DATA_OUT",
 231         "DATA_IN",
 232         "CMD_OUT",
 233         "STATE",
 234         "ILLEGAL PHASE",
 235         "ILLEGAL PHASE",
 236         "MSG OUT",
 237         "MSG IN",
 238 };
 239
 240 /* This translates the SDTR message offset and period to a value
 241  * which can be loaded into the SXFER_REG.
 242  *
 243  * NOTE: According to SCSI-2, the true transfer period (in ns) is
 244  *       actually four times this period value */
 245 static inline __u8
 246 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
 247                                __u8 offset, __u8 period)
 248 {
 249         int XFERP;
 250
 251         __u8 min_xferp = (hostdata->chip710
 252                           ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 253         __u8 max_offset = (hostdata->chip710
 254                            ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
 255
 256         if(offset == 0)
 257                 return 0;
 258
 259         if(period < hostdata->min_period) {
 260                 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
 261                 period = hostdata->min_period;
 262         }
 263         XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
 264         if(offset > max_offset) {
 265                 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
 266                        offset, max_offset);
 267                 offset = max_offset;
 268         }
 269         if(XFERP < min_xferp) {
 270                 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
 271                        XFERP,  min_xferp);
 272                 XFERP =  min_xferp;
 273         }
 274         return (offset & 0x0f) | (XFERP & 0x07)<<4;
 275 }
 276
 277 static inline __u8
 278 NCR_700_get_SXFER(struct scsi_device *SDp)
 279 {
 280         struct NCR_700_Host_Parameters *hostdata =
 281                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
 282
 283         return NCR_700_offset_period_to_sxfer(hostdata,
 284                                               spi_offset(SDp->sdev_target),
 285                                               spi_period(SDp->sdev_target));
 286 }
 287
 288 struct Scsi_Host *
 289 NCR_700_detect(struct scsi_host_template *tpnt,
 290                struct NCR_700_Host_Parameters *hostdata, struct device *dev)
 291 {
 292         dma_addr_t pScript, pSlots;
 293         __u8 *memory;
 294         __u32 *script;
 295         struct Scsi_Host *host;
 296         static int banner = 0;
 297         int j;
 298
 299         if(tpnt->sdev_attrs == NULL)
 300                 tpnt->sdev_attrs = NCR_700_dev_attrs;
 301
 302         memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 303                                        &pScript, GFP_KERNEL);
 304         if(memory == NULL) {
 305                 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
 306                 return NULL;
 307         }
 308
 309         script = (__u32 *)memory;
 310         hostdata->msgin = memory + MSGIN_OFFSET;
 311         hostdata->msgout = memory + MSGOUT_OFFSET;
 312         hostdata->status = memory + STATUS_OFFSET;
 313         /* all of these offsets are L1_CACHE_BYTES separated.  It is fatal
 314          * if this isn't sufficient separation to avoid dma flushing issues */
 315         BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
 316         hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
 317         hostdata->dev = dev;
 318
 319         pSlots = pScript + SLOTS_OFFSET;
 320
 321         /* Fill in the missing routines from the host template */
 322         tpnt->queuecommand = NCR_700_queuecommand;
 323         tpnt->eh_abort_handler = NCR_700_abort;
 324         tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
 325         tpnt->eh_host_reset_handler = NCR_700_host_reset;
 326         tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
 327         tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
 328         tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
 329         tpnt->use_clustering = ENABLE_CLUSTERING;
 330         tpnt->slave_configure = NCR_700_slave_configure;
 331         tpnt->slave_destroy = NCR_700_slave_destroy;
 332         tpnt->slave_alloc = NCR_700_slave_alloc;
 333         tpnt->change_queue_depth = NCR_700_change_queue_depth;
 334         tpnt->change_queue_type = NCR_700_change_queue_type;
 335
 336         if(tpnt->name == NULL)
 337                 tpnt->name = "53c700";
 338         if(tpnt->proc_name == NULL)
 339                 tpnt->proc_name = "53c700";
 340
 341         host = scsi_host_alloc(tpnt, 4);
 342         if (!host)
 343                 return NULL;
 344         memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
 345                * NCR_700_COMMAND_SLOTS_PER_HOST);
 346         for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
 347                 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
 348                                           - (unsigned long)&hostdata->slots[0].SG[0]);
 349                 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
 350                 if(j == 0)
 351                         hostdata->free_list = &hostdata->slots[j];
 352                 else
 353                         hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
 354                 hostdata->slots[j].state = NCR_700_SLOT_FREE;
 355         }
 356
 357         for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
 358                 script[j] = bS_to_host(SCRIPT[j]);
 359
 360         /* adjust all labels to be bus physical */
 361         for (j = 0; j < PATCHES; j++)
 362                 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
 363         /* now patch up fixed addresses. */
 364         script_patch_32(hostdata->dev, script, MessageLocation,
 365                         pScript + MSGOUT_OFFSET);
 366         script_patch_32(hostdata->dev, script, StatusAddress,
 367                         pScript + STATUS_OFFSET);
 368         script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
 369                         pScript + MSGIN_OFFSET);
 370
 371         hostdata->script = script;
 372         hostdata->pScript = pScript;
 373         dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
 374         hostdata->state = NCR_700_HOST_FREE;
 375         hostdata->cmd = NULL;
 376         host->max_id = 8;
 377         host->max_lun = NCR_700_MAX_LUNS;
 378         BUG_ON(NCR_700_transport_template == NULL);
 379         host->transportt = NCR_700_transport_template;
 380         host->unique_id = (unsigned long)hostdata->base;
 381         hostdata->eh_complete = NULL;
 382         host->hostdata[0] = (unsigned long)hostdata;
 383         /* kick the chip */
 384         NCR_700_writeb(0xff, host, CTEST9_REG);
 385         if (hostdata->chip710)
 386                 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
 387         else
 388                 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
 389         hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
 390         if (banner == 0) {
 391                 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
 392                 banner = 1;
 393         }
 394         printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
 395                hostdata->chip710 ? "53c710" :
 396                (hostdata->fast ? "53c700-66" : "53c700"),
 397                hostdata->rev, hostdata->differential ?
 398                "(Differential)" : "");
 399         /* reset the chip */
 400         NCR_700_chip_reset(host);
 401
 402         if (scsi_add_host(host, dev)) {
 403                 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
 404                 scsi_host_put(host);
 405                 return NULL;
 406         }
 407
 408         spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
 409                 SPI_SIGNAL_SE;
 410
 411         return host;
 412 }
 413
 414 int
 415 NCR_700_release(struct Scsi_Host *host)
 416 {
 417         struct NCR_700_Host_Parameters *hostdata =
 418                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 419
 420         dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
 421                                hostdata->script, hostdata->pScript);
 422         return 1;
 423 }
 424
 425 static inline __u8
 426 NCR_700_identify(int can_disconnect, __u8 lun)
 427 {
 428         return IDENTIFY_BASE |
 429                 ((can_disconnect) ? 0x40 : 0) |
 430                 (lun & NCR_700_LUN_MASK);
 431 }
 432
 433 /*
 434  * Function : static int data_residual (Scsi_Host *host)
 435  *
 436  * Purpose : return residual data count of what's in the chip.  If you
 437  * really want to know what this function is doing, it's almost a
 438  * direct transcription of the algorithm described in the 53c710
 439  * guide, except that the DBC and DFIFO registers are only 6 bits
 440  * wide on a 53c700.
 441  *
 442  * Inputs : host - SCSI host */
 443 static inline int
 444 NCR_700_data_residual (struct Scsi_Host *host) {
 445         struct NCR_700_Host_Parameters *hostdata =
 446                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 447         int count, synchronous = 0;
 448         unsigned int ddir;
 449
 450         if(hostdata->chip710) {
 451                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
 452                          (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
 453         } else {
 454                 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
 455                          (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
 456         }
 457
 458         if(hostdata->fast)
 459                 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
 460
 461         /* get the data direction */
 462         ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
 463
 464         if (ddir) {
 465                 /* Receive */
 466                 if (synchronous)
 467                         count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
 468                 else
 469                         if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
 470                                 ++count;
 471         } else {
 472                 /* Send */
 473                 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
 474                 if (sstat & SODL_REG_FULL)
 475                         ++count;
 476                 if (synchronous && (sstat & SODR_REG_FULL))
 477                         ++count;
 478         }
 479 #ifdef NCR_700_DEBUG
 480         if(count)
 481                 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
 482 #endif
 483         return count;
 484 }
 485
 486 /* print out the SCSI wires and corresponding phase from the SBCL register
 487  * in the chip */
 488 static inline char *
 489 sbcl_to_string(__u8 sbcl)
 490 {
 491         int i;
 492         static char ret[256];
 493
 494         ret[0]='\0';
 495         for(i=0; i<8; i++) {
 496                 if((1<<i) & sbcl)
 497                         strcat(ret, NCR_700_SBCL_bits[i]);
 498         }
 499         strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
 500         return ret;
 501 }
 502
 503 static inline __u8
 504 bitmap_to_number(__u8 bitmap)
 505 {
 506         __u8 i;
 507
 508         for(i=0; i<8 && !(bitmap &(1<<i)); i++)
 509                 ;
 510         return i;
 511 }
 512
 513 /* Pull a slot off the free list */
 514 STATIC struct NCR_700_command_slot *
 515 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
 516 {
 517         struct NCR_700_command_slot *slot = hostdata->free_list;
 518
 519         if(slot == NULL) {
 520                 /* sanity check */
 521                 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
 522                         printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
 523                 return NULL;
 524         }
 525
 526         if(slot->state != NCR_700_SLOT_FREE)
 527                 /* should panic! */
 528                 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
 529
 530
 531         hostdata->free_list = slot->ITL_forw;
 532         slot->ITL_forw = NULL;
 533
 534
 535         /* NOTE: set the state to busy here, not queued, since this
 536          * indicates the slot is in use and cannot be run by the IRQ
 537          * finish routine.  If we cannot queue the command when it
 538          * is properly build, we then change to NCR_700_SLOT_QUEUED */
 539         slot->state = NCR_700_SLOT_BUSY;
 540         slot->flags = 0;
 541         hostdata->command_slot_count++;
 542
 543         return slot;
 544 }
 545
 546 STATIC void
 547 free_slot(struct NCR_700_command_slot *slot,
 548           struct NCR_700_Host_Parameters *hostdata)
 549 {
 550         if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
 551                 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
 552         }
 553         if(slot->state == NCR_700_SLOT_FREE) {
 554                 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
 555         }
 556
 557         slot->resume_offset = 0;
 558         slot->cmnd = NULL;
 559         slot->state = NCR_700_SLOT_FREE;
 560         slot->ITL_forw = hostdata->free_list;
 561         hostdata->free_list = slot;
 562         hostdata->command_slot_count--;
 563 }
 564
 565
 566 /* This routine really does very little.  The command is indexed on
 567    the ITL and (if tagged) the ITLQ lists in _queuecommand */
 568 STATIC void
 569 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
 570                      struct scsi_cmnd *SCp, __u32 dsp)
 571 {
 572         /* Its just possible that this gets executed twice */
 573         if(SCp != NULL) {
 574                 struct NCR_700_command_slot *slot =
 575                         (struct NCR_700_command_slot *)SCp->host_scribble;
 576
 577                 slot->resume_offset = dsp;
 578         }
 579         hostdata->state = NCR_700_HOST_FREE;
 580         hostdata->cmd = NULL;
 581 }
 582
 583 STATIC inline void
 584 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 585               struct NCR_700_command_slot *slot)
 586 {
 587         if(SCp->sc_data_direction != DMA_NONE &&
 588            SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
 589                 if(SCp->use_sg) {
 590                         dma_unmap_sg(hostdata->dev, SCp->request_buffer,
 591                                      SCp->use_sg, SCp->sc_data_direction);
 592                 } else {
 593                         dma_unmap_single(hostdata->dev, slot->dma_handle,
 594                                          SCp->request_bufflen,
 595                                          SCp->sc_data_direction);
 596                 }
 597         }
 598 }
 599
 600 STATIC inline void
 601 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
 602                struct scsi_cmnd *SCp, int result)
 603 {
 604         hostdata->state = NCR_700_HOST_FREE;
 605         hostdata->cmd = NULL;
 606
 607         if(SCp != NULL) {
 608                 struct NCR_700_command_slot *slot =
 609                         (struct NCR_700_command_slot *)SCp->host_scribble;
 610
 611                 dma_unmap_single(hostdata->dev, slot->pCmd,
 612                                  sizeof(SCp->cmnd), DMA_TO_DEVICE);
 613                 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
 614                         char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
 615 #ifdef NCR_700_DEBUG
 616                         printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
 617                                SCp, SCp->cmnd[7], result);
 618                         scsi_print_sense("53c700", SCp);
 619
 620 #endif
 621                         dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
 622                         /* restore the old result if the request sense was
 623                          * successful */
 624                         if (result == 0)
 625                                 result = cmnd[7];
 626                         /* restore the original length */
 627                         SCp->cmd_len = cmnd[8];
 628                 } else
 629                         NCR_700_unmap(hostdata, SCp, slot);
 630
 631                 free_slot(slot, hostdata);
 632 #ifdef NCR_700_DEBUG
 633                 if(NCR_700_get_depth(SCp->device) == 0 ||
 634                    NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
 635                         printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
 636                                NCR_700_get_depth(SCp->device));
 637 #endif /* NCR_700_DEBUG */
 638                 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
 639
 640                 SCp->host_scribble = NULL;
 641                 SCp->result = result;
 642                 SCp->scsi_done(SCp);
 643         } else {
 644                 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
 645         }
 646 }
 647
 648
 649 STATIC void
 650 NCR_700_internal_bus_reset(struct Scsi_Host *host)
 651 {
 652         /* Bus reset */
 653         NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
 654         udelay(50);
 655         NCR_700_writeb(0, host, SCNTL1_REG);
 656
 657 }
 658
 659 STATIC void
 660 NCR_700_chip_setup(struct Scsi_Host *host)
 661 {
 662         struct NCR_700_Host_Parameters *hostdata =
 663                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 664         __u32 dcntl_extra = 0;
 665         __u8 min_period;
 666         __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
 667
 668         if(hostdata->chip710) {
 669                 __u8 burst_disable = 0;
 670                 __u8 burst_length = 0;
 671
 672                 switch (hostdata->burst_length) {
 673                         case 1:
 674                                 burst_length = BURST_LENGTH_1;
 675                                 break;
 676                         case 2:
 677                                 burst_length = BURST_LENGTH_2;
 678                                 break;
 679                         case 4:
 680                                 burst_length = BURST_LENGTH_4;
 681                                 break;
 682                         case 8:
 683                                 burst_length = BURST_LENGTH_8;
 684                                 break;
 685                         default:
 686                                 burst_disable = BURST_DISABLE;
 687                                 break;
 688                 }
 689                 dcntl_extra = COMPAT_700_MODE;
 690
 691                 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
 692                 NCR_700_writeb(burst_length | hostdata->dmode_extra,
 693                                host, DMODE_710_REG);
 694                 NCR_700_writeb(burst_disable | (hostdata->differential ?
 695                                                 DIFF : 0), host, CTEST7_REG);
 696                 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
 697                 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
 698                                | AUTO_ATN, host, SCNTL0_REG);
 699         } else {
 700                 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
 701                                host, DMODE_700_REG);
 702                 NCR_700_writeb(hostdata->differential ?
 703                                DIFF : 0, host, CTEST7_REG);
 704                 if(hostdata->fast) {
 705                         /* this is for 700-66, does nothing on 700 */
 706                         NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
 707                                        | GENERATE_RECEIVE_PARITY, host,
 708                                        CTEST8_REG);
 709                 } else {
 710                         NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
 711                                        | PARITY | AUTO_ATN, host, SCNTL0_REG);
 712                 }
 713         }
 714
 715         NCR_700_writeb(1 << host->this_id, host, SCID_REG);
 716         NCR_700_writeb(0, host, SBCL_REG);
 717         NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
 718
 719         NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
 720              | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
 721
 722         NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
 723         NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
 724         if(hostdata->clock > 75) {
 725                 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
 726                 /* do the best we can, but the async clock will be out
 727                  * of spec: sync divider 2, async divider 3 */
 728                 DEBUG(("53c700: sync 2 async 3\n"));
 729                 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
 730                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
 731                 hostdata->sync_clock = hostdata->clock/2;
 732         } else  if(hostdata->clock > 50  && hostdata->clock <= 75) {
 733                 /* sync divider 1.5, async divider 3 */
 734                 DEBUG(("53c700: sync 1.5 async 3\n"));
 735                 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
 736                 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
 737                 hostdata->sync_clock = hostdata->clock*2;
 738                 hostdata->sync_clock /= 3;
 739
 740         } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
 741                 /* sync divider 1, async divider 2 */
 742                 DEBUG(("53c700: sync 1 async 2\n"));
 743                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 744                 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
 745                 hostdata->sync_clock = hostdata->clock;
 746         } else if(hostdata->clock > 25 && hostdata->clock <=37) {
 747                 /* sync divider 1, async divider 1.5 */
 748                 DEBUG(("53c700: sync 1 async 1.5\n"));
 749                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 750                 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
 751                 hostdata->sync_clock = hostdata->clock;
 752         } else {
 753                 DEBUG(("53c700: sync 1 async 1\n"));
 754                 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
 755                 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
 756                 /* sync divider 1, async divider 1 */
 757                 hostdata->sync_clock = hostdata->clock;
 758         }
 759         /* Calculate the actual minimum period that can be supported
 760          * by our synchronous clock speed.  See the 710 manual for
 761          * exact details of this calculation which is based on a
 762          * setting of the SXFER register */
 763         min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
 764         hostdata->min_period = NCR_700_MIN_PERIOD;
 765         if(min_period > NCR_700_MIN_PERIOD)
 766                 hostdata->min_period = min_period;
 767 }
 768
 769 STATIC void
 770 NCR_700_chip_reset(struct Scsi_Host *host)
 771 {
 772         struct NCR_700_Host_Parameters *hostdata =
 773                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
 774         if(hostdata->chip710) {
 775                 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
 776                 udelay(100);
 777
 778                 NCR_700_writeb(0, host, ISTAT_REG);
 779         } else {
 780                 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
 781                 udelay(100);
 782
 783                 NCR_700_writeb(0, host, DCNTL_REG);
 784         }
 785
 786         mdelay(1000);
 787
 788         NCR_700_chip_setup(host);
 789 }
 790
 791 /* The heart of the message processing engine is that the instruction
 792  * immediately after the INT is the normal case (and so must be CLEAR
 793  * ACK).  If we want to do something else, we call that routine in
 794  * scripts and set temp to be the normal case + 8 (skipping the CLEAR
 795  * ACK) so that the routine returns correctly to resume its activity
 796  * */
 797 STATIC __u32
 798 process_extended_message(struct Scsi_Host *host,
 799                          struct NCR_700_Host_Parameters *hostdata,
 800                          struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 801 {
 802         __u32 resume_offset = dsp, temp = dsp + 8;
 803         __u8 pun = 0xff, lun = 0xff;
 804
 805         if(SCp != NULL) {
 806                 pun = SCp->device->id;
 807                 lun = SCp->device->lun;
 808         }
 809
 810         switch(hostdata->msgin[2]) {
 811         case A_SDTR_MSG:
 812                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 813                         struct scsi_target *starget = SCp->device->sdev_target;
 814                         __u8 period = hostdata->msgin[3];
 815                         __u8 offset = hostdata->msgin[4];
 816
 817                         if(offset == 0 || period == 0) {
 818                                 offset = 0;
 819                                 period = 0;
 820                         }
 821
 822                         spi_offset(starget) = offset;
 823                         spi_period(starget) = period;
 824
 825                         if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
 826                                 spi_display_xfer_agreement(starget);
 827                                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
 828                         }
 829
 830                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 831                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 832
 833                         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
 834                                        host, SXFER_REG);
 835
 836                 } else {
 837                         /* SDTR message out of the blue, reject it */
 838                         shost_printk(KERN_WARNING, host,
 839                                 "Unexpected SDTR msg\n");
 840                         hostdata->msgout[0] = A_REJECT_MSG;
 841                         dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 842                         script_patch_16(hostdata->dev, hostdata->script,
 843                                         MessageCount, 1);
 844                         /* SendMsgOut returns, so set up the return
 845                          * address */
 846                         resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 847                 }
 848                 break;
 849
 850         case A_WDTR_MSG:
 851                 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
 852                        host->host_no, pun, lun);
 853                 hostdata->msgout[0] = A_REJECT_MSG;
 854                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 855                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 856                                 1);
 857                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 858
 859                 break;
 860
 861         default:
 862                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 863                        host->host_no, pun, lun,
 864                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 865                 spi_print_msg(hostdata->msgin);
 866                 printk("\n");
 867                 /* just reject it */
 868                 hostdata->msgout[0] = A_REJECT_MSG;
 869                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 870                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 871                                 1);
 872                 /* SendMsgOut returns, so set up the return
 873                  * address */
 874                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 875         }
 876         NCR_700_writel(temp, host, TEMP_REG);
 877         return resume_offset;
 878 }
 879
 880 STATIC __u32
 881 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
 882                 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
 883 {
 884         /* work out where to return to */
 885         __u32 temp = dsp + 8, resume_offset = dsp;
 886         __u8 pun = 0xff, lun = 0xff;
 887
 888         if(SCp != NULL) {
 889                 pun = SCp->device->id;
 890                 lun = SCp->device->lun;
 891         }
 892
 893 #ifdef NCR_700_DEBUG
 894         printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
 895                NCR_700_phase[(dsps & 0xf00) >> 8]);
 896         spi_print_msg(hostdata->msgin);
 897         printk("\n");
 898 #endif
 899
 900         switch(hostdata->msgin[0]) {
 901
 902         case A_EXTENDED_MSG:
 903                 resume_offset =  process_extended_message(host, hostdata, SCp,
 904                                                           dsp, dsps);
 905                 break;
 906
 907         case A_REJECT_MSG:
 908                 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
 909                         /* Rejected our sync negotiation attempt */
 910                         spi_period(SCp->device->sdev_target) =
 911                                 spi_offset(SCp->device->sdev_target) = 0;
 912                         NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
 913                         NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
 914                 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
 915                         /* rejected our first simple tag message */
 916                         scmd_printk(KERN_WARNING, SCp,
 917                                 "Rejected first tag queue attempt, turning off tag queueing\n");
 918                         /* we're done negotiating */
 919                         NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
 920                         hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
 921                         SCp->device->tagged_supported = 0;
 922                         scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
 923                 } else {
 924                         shost_printk(KERN_WARNING, host,
 925                                 "(%d:%d) Unexpected REJECT Message %s\n",
 926                                pun, lun,
 927                                NCR_700_phase[(dsps & 0xf00) >> 8]);
 928                         /* however, just ignore it */
 929                 }
 930                 break;
 931
 932         case A_PARITY_ERROR_MSG:
 933                 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
 934                        pun, lun);
 935                 NCR_700_internal_bus_reset(host);
 936                 break;
 937         case A_SIMPLE_TAG_MSG:
 938                 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
 939                        pun, lun, hostdata->msgin[1],
 940                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 941                 /* just ignore it */
 942                 break;
 943         default:
 944                 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
 945                        host->host_no, pun, lun,
 946                        NCR_700_phase[(dsps & 0xf00) >> 8]);
 947
 948                 spi_print_msg(hostdata->msgin);
 949                 printk("\n");
 950                 /* just reject it */
 951                 hostdata->msgout[0] = A_REJECT_MSG;
 952                 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
 953                 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
 954                                 1);
 955                 /* SendMsgOut returns, so set up the return
 956                  * address */
 957                 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
 958
 959                 break;
 960         }
 961         NCR_700_writel(temp, host, TEMP_REG);
 962         /* set us up to receive another message */
 963         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
 964         return resume_offset;
 965 }
 966
 967 STATIC __u32
 968 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 969                          struct Scsi_Host *host,
 970                          struct NCR_700_Host_Parameters *hostdata)
 971 {
 972         __u32 resume_offset = 0;
 973         __u8 pun = 0xff, lun=0xff;
 974
 975         if(SCp != NULL) {
 976                 pun = SCp->device->id;
 977                 lun = SCp->device->lun;
 978         }
 979
 980         if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
 981                 DEBUG(("  COMMAND COMPLETE, status=%02x\n",
 982                        hostdata->status[0]));
 983                 /* OK, if TCQ still under negotiation, we now know it works */
 984                 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
 985                         NCR_700_set_tag_neg_state(SCp->device,
 986                                                   NCR_700_FINISHED_TAG_NEGOTIATION);
 987
 988                 /* check for contingent allegiance contitions */
 989                 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
 990                    status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
 991                         struct NCR_700_command_slot *slot =
 992                                 (struct NCR_700_command_slot *)SCp->host_scribble;
 993                         if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
 994                                 /* OOPS: bad device, returning another
 995                                  * contingent allegiance condition */
 996                                 scmd_printk(KERN_ERR, SCp,
 997                                         "broken device is looping in contingent allegiance: ignoring\n");
 998                                 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
 999                         } else {
1000                                 char *cmnd =
1001                                         NCR_700_get_sense_cmnd(SCp->device);
1002 #ifdef NCR_DEBUG
1003                                 scsi_print_command(SCp);
1004                                 printk("  cmd %p has status %d, requesting sense\n",
1005                                        SCp, hostdata->status[0]);
1006 #endif
1007                                 /* we can destroy the command here
1008                                  * because the contingent allegiance
1009                                  * condition will cause a retry which
1010                                  * will re-copy the command from the
1011                                  * saved data_cmnd.  We also unmap any
1012                                  * data associated with the command
1013                                  * here */
1014                                 NCR_700_unmap(hostdata, SCp, slot);
1015                                 dma_unmap_single(hostdata->dev, slot->pCmd,
1016                                                  sizeof(SCp->cmnd),
1017                                                  DMA_TO_DEVICE);
1018
1019                                 cmnd[0] = REQUEST_SENSE;
1020                                 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1021                                 cmnd[2] = 0;
1022                                 cmnd[3] = 0;
1023                                 cmnd[4] = sizeof(SCp->sense_buffer);
1024                                 cmnd[5] = 0;
1025                                 /* Here's a quiet hack: the
1026                                  * REQUEST_SENSE command is six bytes,
1027                                  * so store a flag indicating that
1028                                  * this was an internal sense request
1029                                  * and the original status at the end
1030                                  * of the command */
1031                                 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1032                                 cmnd[7] = hostdata->status[0];
1033                                 cmnd[8] = SCp->cmd_len;
1034                                 SCp->cmd_len = 6; /* command length for
1035                                                    * REQUEST_SENSE */
1036                                 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1037                                 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1038                                 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1039                                 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1040                                 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1041                                 slot->SG[1].pAddr = 0;
1042                                 slot->resume_offset = hostdata->pScript;
1043                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1044                                 dma_cache_sync(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1045
1046                                 /* queue the command for reissue */
1047                                 slot->state = NCR_700_SLOT_QUEUED;
1048                                 slot->flags = NCR_700_FLAG_AUTOSENSE;
1049                                 hostdata->state = NCR_700_HOST_FREE;
1050                                 hostdata->cmd = NULL;
1051                         }
1052                 } else {
1053                         // Currently rely on the mid layer evaluation
1054                         // of the tag queuing capability
1055                         //
1056                         //if(status_byte(hostdata->status[0]) == GOOD &&
1057                         //   SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1058                         //      /* Piggy back the tag queueing support
1059                         //       * on this command */
1060                         //      dma_sync_single_for_cpu(hostdata->dev,
1061                         //                          slot->dma_handle,
1062                         //                          SCp->request_bufflen,
1063                         //                          DMA_FROM_DEVICE);
1064                         //      if(((char *)SCp->request_buffer)[7] & 0x02) {
1065                         //              scmd_printk(KERN_INFO, SCp,
1066                         //                   "Enabling Tag Command Queuing\n");
1067                         //              hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1068                         //              NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1069                         //      } else {
1070                         //              NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1071                         //              hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1072                         //      }
1073                         //}
1074                         NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1075                 }
1076         } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1077                 __u8 i = (dsps & 0xf00) >> 8;
1078
1079                 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1080                        NCR_700_phase[i],
1081                        sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1082                 scmd_printk(KERN_ERR, SCp, "         len = %d, cmd =",
1083                         SCp->cmd_len);
1084                 scsi_print_command(SCp);
1085
1086                 NCR_700_internal_bus_reset(host);
1087         } else if((dsps & 0xfffff000) == A_FATAL) {
1088                 int i = (dsps & 0xfff);
1089
1090                 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1091                        host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1092                 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1093                         printk(KERN_ERR "     msg begins %02x %02x\n",
1094                                hostdata->msgin[0], hostdata->msgin[1]);
1095                 }
1096                 NCR_700_internal_bus_reset(host);
1097         } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1098 #ifdef NCR_700_DEBUG
1099                 __u8 i = (dsps & 0xf00) >> 8;
1100
1101                 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1102                        host->host_no, pun, lun,
1103                        i, NCR_700_phase[i]);
1104 #endif
1105                 save_for_reselection(hostdata, SCp, dsp);
1106
1107         } else if(dsps == A_RESELECTION_IDENTIFIED) {
1108                 __u8 lun;
1109                 struct NCR_700_command_slot *slot;
1110                 __u8 reselection_id = hostdata->reselection_id;
1111                 struct scsi_device *SDp;
1112
1113                 lun = hostdata->msgin[0] & 0x1f;
1114
1115                 hostdata->reselection_id = 0xff;
1116                 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1117                        host->host_no, reselection_id, lun));
1118                 /* clear the reselection indicator */
1119                 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1120                 if(unlikely(SDp == NULL)) {
1121                         printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1122                                host->host_no, reselection_id, lun);
1123                         BUG();
1124                 }
1125                 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1126                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1127                         if(unlikely(SCp == NULL)) {
1128                                 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1129                                        host->host_no, reselection_id, lun, hostdata->msgin[2]);
1130                                 BUG();
1131                         }
1132
1133                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1134                         DDEBUG(KERN_DEBUG, SDp,
1135                                 "reselection is tag %d, slot %p(%d)\n",
1136                                 hostdata->msgin[2], slot, slot->tag);
1137                 } else {
1138                         struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1139                         if(unlikely(SCp == NULL)) {
1140                                 sdev_printk(KERN_ERR, SDp,
1141                                         "no saved request for untagged cmd\n");
1142                                 BUG();
1143                         }
1144                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1145                 }
1146
1147                 if(slot == NULL) {
1148                         printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1149                                host->host_no, reselection_id, lun,
1150                                hostdata->msgin[0], hostdata->msgin[1],
1151                                hostdata->msgin[2]);
1152                 } else {
1153                         if(hostdata->state != NCR_700_HOST_BUSY)
1154                                 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1155                                        host->host_no);
1156                         resume_offset = slot->resume_offset;
1157                         hostdata->cmd = slot->cmnd;
1158
1159                         /* re-patch for this command */
1160                         script_patch_32_abs(hostdata->dev, hostdata->script,
1161                                             CommandAddress, slot->pCmd);
1162                         script_patch_16(hostdata->dev, hostdata->script,
1163                                         CommandCount, slot->cmnd->cmd_len);
1164                         script_patch_32_abs(hostdata->dev, hostdata->script,
1165                                             SGScriptStartAddress,
1166                                             to32bit(&slot->pSG[0].ins));
1167
1168                         /* Note: setting SXFER only works if we're
1169                          * still in the MESSAGE phase, so it is vital
1170                          * that ACK is still asserted when we process
1171                          * the reselection message.  The resume offset
1172                          * should therefore always clear ACK */
1173                         NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1174                                        host, SXFER_REG);
1175                         dma_cache_sync(hostdata->dev, hostdata->msgin,
1176                                        MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1177                         dma_cache_sync(hostdata->dev, hostdata->msgout,
1178                                        MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1179                         /* I'm just being paranoid here, the command should
1180                          * already have been flushed from the cache */
1181                         dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1182                                        slot->cmnd->cmd_len, DMA_TO_DEVICE);
1183
1184
1185
1186                 }
1187         } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1188
1189                 /* This section is full of debugging code because I've
1190                  * never managed to reach it.  I think what happens is
1191                  * that, because the 700 runs with selection
1192                  * interrupts enabled the whole time that we take a
1193                  * selection interrupt before we manage to get to the
1194                  * reselected script interrupt */
1195
1196                 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1197                 struct NCR_700_command_slot *slot;
1198
1199                 /* Take out our own ID */
1200                 reselection_id &= ~(1<<host->this_id);
1201
1202                 /* I've never seen this happen, so keep this as a printk rather
1203                  * than a debug */
1204                 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1205                        host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1206
1207                 {
1208                         /* FIXME: DEBUGGING CODE */
1209                         __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1210                         int i;
1211
1212                         for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1213                                 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1214                                    && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1215                                         break;
1216                         }
1217                         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);
1218                         SCp =  hostdata->slots[i].cmnd;
1219                 }
1220
1221                 if(SCp != NULL) {
1222                         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1223                         /* change slot from busy to queued to redo command */
1224                         slot->state = NCR_700_SLOT_QUEUED;
1225                 }
1226                 hostdata->cmd = NULL;
1227
1228                 if(reselection_id == 0) {
1229                         if(hostdata->reselection_id == 0xff) {
1230                                 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1231                                 return 0;
1232                         } else {
1233                                 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1234                                        host->host_no);
1235                                 reselection_id = hostdata->reselection_id;
1236                         }
1237                 } else {
1238
1239                         /* convert to real ID */
1240                         reselection_id = bitmap_to_number(reselection_id);
1241                 }
1242                 hostdata->reselection_id = reselection_id;
1243                 /* just in case we have a stale simple tag message, clear it */
1244                 hostdata->msgin[1] = 0;
1245                 dma_cache_sync(hostdata->dev, hostdata->msgin,
1246                                MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1247                 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1248                         resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1249                 } else {
1250                         resume_offset = hostdata->pScript + Ent_GetReselectionData;
1251                 }
1252         } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1253                 /* we've just disconnected from the bus, do nothing since
1254                  * a return here will re-run the queued command slot
1255                  * that may have been interrupted by the initial selection */
1256                 DEBUG((" SELECTION COMPLETED\n"));
1257         } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1258                 resume_offset = process_message(host, hostdata, SCp,
1259                                                 dsp, dsps);
1260         } else if((dsps &  0xfffff000) == 0) {
1261                 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1262                 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1263                        host->host_no, pun, lun, NCR_700_condition[i],
1264                        NCR_700_phase[j], dsp - hostdata->pScript);
1265                 if(SCp != NULL) {
1266                         scsi_print_command(SCp);
1267
1268                         if(SCp->use_sg) {
1269                                 for(i = 0; i < SCp->use_sg + 1; i++) {
1270                                         printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1271                                 }
1272                         }
1273                 }
1274                 NCR_700_internal_bus_reset(host);
1275         } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1276                 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1277                        host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1278                 resume_offset = dsp;
1279         } else {
1280                 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1281                        host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1282                 NCR_700_internal_bus_reset(host);
1283         }
1284         return resume_offset;
1285 }
1286
1287 /* We run the 53c700 with selection interrupts always enabled.  This
1288  * means that the chip may be selected as soon as the bus frees.  On a
1289  * busy bus, this can be before the scripts engine finishes its
1290  * processing.  Therefore, part of the selection processing has to be
1291  * to find out what the scripts engine is doing and complete the
1292  * function if necessary (i.e. process the pending disconnect or save
1293  * the interrupted initial selection */
1294 STATIC inline __u32
1295 process_selection(struct Scsi_Host *host, __u32 dsp)
1296 {
1297         __u8 id = 0;    /* Squash compiler warning */
1298         int count = 0;
1299         __u32 resume_offset = 0;
1300         struct NCR_700_Host_Parameters *hostdata =
1301                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1302         struct scsi_cmnd *SCp = hostdata->cmd;
1303         __u8 sbcl;
1304
1305         for(count = 0; count < 5; count++) {
1306                 id = NCR_700_readb(host, hostdata->chip710 ?
1307                                    CTEST9_REG : SFBR_REG);
1308
1309                 /* Take out our own ID */
1310                 id &= ~(1<<host->this_id);
1311                 if(id != 0)
1312                         break;
1313                 udelay(5);
1314         }
1315         sbcl = NCR_700_readb(host, SBCL_REG);
1316         if((sbcl & SBCL_IO) == 0) {
1317                 /* mark as having been selected rather than reselected */
1318                 id = 0xff;
1319         } else {
1320                 /* convert to real ID */
1321                 hostdata->reselection_id = id = bitmap_to_number(id);
1322                 DEBUG(("scsi%d:  Reselected by %d\n",
1323                        host->host_no, id));
1324         }
1325         if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1326                 struct NCR_700_command_slot *slot =
1327                         (struct NCR_700_command_slot *)SCp->host_scribble;
1328                 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));
1329
1330                 switch(dsp - hostdata->pScript) {
1331                 case Ent_Disconnect1:
1332                 case Ent_Disconnect2:
1333                         save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1334                         break;
1335                 case Ent_Disconnect3:
1336                 case Ent_Disconnect4:
1337                         save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1338                         break;
1339                 case Ent_Disconnect5:
1340                 case Ent_Disconnect6:
1341                         save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1342                         break;
1343                 case Ent_Disconnect7:
1344                 case Ent_Disconnect8:
1345                         save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1346                         break;
1347                 case Ent_Finish1:
1348                 case Ent_Finish2:
1349                         process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1350                         break;
1351
1352                 default:
1353                         slot->state = NCR_700_SLOT_QUEUED;
1354                         break;
1355                         }
1356         }
1357         hostdata->state = NCR_700_HOST_BUSY;
1358         hostdata->cmd = NULL;
1359         /* clear any stale simple tag message */
1360         hostdata->msgin[1] = 0;
1361         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1362                        DMA_BIDIRECTIONAL);
1363
1364         if(id == 0xff) {
1365                 /* Selected as target, Ignore */
1366                 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1367         } else if(hostdata->tag_negotiated & (1<<id)) {
1368                 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1369         } else {
1370                 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1371         }
1372         return resume_offset;
1373 }
1374
1375 static inline void
1376 NCR_700_clear_fifo(struct Scsi_Host *host) {
1377         const struct NCR_700_Host_Parameters *hostdata
1378                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1379         if(hostdata->chip710) {
1380                 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1381         } else {
1382                 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1383         }
1384 }
1385
1386 static inline void
1387 NCR_700_flush_fifo(struct Scsi_Host *host) {
1388         const struct NCR_700_Host_Parameters *hostdata
1389                 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1390         if(hostdata->chip710) {
1391                 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1392                 udelay(10);
1393                 NCR_700_writeb(0, host, CTEST8_REG);
1394         } else {
1395                 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1396                 udelay(10);
1397                 NCR_700_writeb(0, host, DFIFO_REG);
1398         }
1399 }
1400
1401
1402 /* The queue lock with interrupts disabled must be held on entry to
1403  * this function */
1404 STATIC int
1405 NCR_700_start_command(struct scsi_cmnd *SCp)
1406 {
1407         struct NCR_700_command_slot *slot =
1408                 (struct NCR_700_command_slot *)SCp->host_scribble;
1409         struct NCR_700_Host_Parameters *hostdata =
1410                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1411         __u16 count = 1;        /* for IDENTIFY message */
1412
1413         if(hostdata->state != NCR_700_HOST_FREE) {
1414                 /* keep this inside the lock to close the race window where
1415                  * the running command finishes on another CPU while we don't
1416                  * change the state to queued on this one */
1417                 slot->state = NCR_700_SLOT_QUEUED;
1418
1419                 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1420                        SCp->device->host->host_no, slot->cmnd, slot));
1421                 return 0;
1422         }
1423         hostdata->state = NCR_700_HOST_BUSY;
1424         hostdata->cmd = SCp;
1425         slot->state = NCR_700_SLOT_BUSY;
1426         /* keep interrupts disabled until we have the command correctly
1427          * set up so we cannot take a selection interrupt */
1428
1429         hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1430                                                 slot->flags != NCR_700_FLAG_AUTOSENSE),
1431                                                SCp->device->lun);
1432         /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1433          * if the negotiated transfer parameters still hold, so
1434          * always renegotiate them */
1435         if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1436            slot->flags == NCR_700_FLAG_AUTOSENSE) {
1437                 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1438         }
1439
1440         /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1441          * If a contingent allegiance condition exists, the device
1442          * will refuse all tags, so send the request sense as untagged
1443          * */
1444         if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1445            && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1446                slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1447                 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1448         }
1449
1450         if(hostdata->fast &&
1451            NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1452                 count += spi_populate_sync_msg(&hostdata->msgout[count],
1453                                 spi_period(SCp->device->sdev_target),
1454                                 spi_offset(SCp->device->sdev_target));
1455                 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1456         }
1457
1458         script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1459
1460
1461         script_patch_ID(hostdata->dev, hostdata->script,
1462                         Device_ID, 1<<scmd_id(SCp));
1463
1464         script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1465                             slot->pCmd);
1466         script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1467                         SCp->cmd_len);
1468         /* finally plumb the beginning of the SG list into the script
1469          * */
1470         script_patch_32_abs(hostdata->dev, hostdata->script,
1471                             SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1472         NCR_700_clear_fifo(SCp->device->host);
1473
1474         if(slot->resume_offset == 0)
1475                 slot->resume_offset = hostdata->pScript;
1476         /* now perform all the writebacks and invalidates */
1477         dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1478         dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1479                        DMA_FROM_DEVICE);
1480         dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1481         dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1482
1483         /* set the synchronous period/offset */
1484         NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1485                        SCp->device->host, SXFER_REG);
1486         NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1487         NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1488
1489         return 1;
1490 }
1491
1492 irqreturn_t
1493 NCR_700_intr(int irq, void *dev_id)
1494 {
1495         struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1496         struct NCR_700_Host_Parameters *hostdata =
1497                 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1498         __u8 istat;
1499         __u32 resume_offset = 0;
1500         __u8 pun = 0xff, lun = 0xff;
1501         unsigned long flags;
1502         int handled = 0;
1503
1504         /* Use the host lock to serialise acess to the 53c700
1505          * hardware.  Note: In future, we may need to take the queue
1506          * lock to enter the done routines.  When that happens, we
1507          * need to ensure that for this driver, the host lock and the
1508          * queue lock point to the same thing. */
1509         spin_lock_irqsave(host->host_lock, flags);
1510         if((istat = NCR_700_readb(host, ISTAT_REG))
1511               & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1512                 __u32 dsps;
1513                 __u8 sstat0 = 0, dstat = 0;
1514                 __u32 dsp;
1515                 struct scsi_cmnd *SCp = hostdata->cmd;
1516                 enum NCR_700_Host_State state;
1517
1518                 handled = 1;
1519                 state = hostdata->state;
1520                 SCp = hostdata->cmd;
1521
1522                 if(istat & SCSI_INT_PENDING) {
1523                         udelay(10);
1524
1525                         sstat0 = NCR_700_readb(host, SSTAT0_REG);
1526                 }
1527
1528                 if(istat & DMA_INT_PENDING) {
1529                         udelay(10);
1530
1531                         dstat = NCR_700_readb(host, DSTAT_REG);
1532                 }
1533
1534                 dsps = NCR_700_readl(host, DSPS_REG);
1535                 dsp = NCR_700_readl(host, DSP_REG);
1536
1537                 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1538                        host->host_no, istat, sstat0, dstat,
1539                        (dsp - (__u32)(hostdata->pScript))/4,
1540                        dsp, dsps));
1541
1542                 if(SCp != NULL) {
1543                         pun = SCp->device->id;
1544                         lun = SCp->device->lun;
1545                 }
1546
1547                 if(sstat0 & SCSI_RESET_DETECTED) {
1548                         struct scsi_device *SDp;
1549                         int i;
1550
1551                         hostdata->state = NCR_700_HOST_BUSY;
1552
1553                         printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1554                                host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1555
1556                         scsi_report_bus_reset(host, 0);
1557
1558                         /* clear all the negotiated parameters */
1559                         __shost_for_each_device(SDp, host)
1560                                 NCR_700_clear_flag(SDp, ~0);
1561
1562                         /* clear all the slots and their pending commands */
1563                         for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1564                                 struct scsi_cmnd *SCp;
1565                                 struct NCR_700_command_slot *slot =
1566                                         &hostdata->slots[i];
1567
1568                                 if(slot->state == NCR_700_SLOT_FREE)
1569                                         continue;
1570
1571                                 SCp = slot->cmnd;
1572                                 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1573                                        slot, SCp);
1574                                 free_slot(slot, hostdata);
1575                                 SCp->host_scribble = NULL;
1576                                 NCR_700_set_depth(SCp->device, 0);
1577                                 /* NOTE: deadlock potential here: we
1578                                  * rely on mid-layer guarantees that
1579                                  * scsi_done won't try to issue the
1580                                  * command again otherwise we'll
1581                                  * deadlock on the
1582                                  * hostdata->state_lock */
1583                                 SCp->result = DID_RESET << 16;
1584                                 SCp->scsi_done(SCp);
1585                         }
1586                         mdelay(25);
1587                         NCR_700_chip_setup(host);
1588
1589                         hostdata->state = NCR_700_HOST_FREE;
1590                         hostdata->cmd = NULL;
1591                         /* signal back if this was an eh induced reset */
1592                         if(hostdata->eh_complete != NULL)
1593                                 complete(hostdata->eh_complete);
1594                         goto out_unlock;
1595                 } else if(sstat0 & SELECTION_TIMEOUT) {
1596                         DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1597                                host->host_no, pun, lun));
1598                         NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1599                 } else if(sstat0 & PHASE_MISMATCH) {
1600                         struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1601                                 (struct NCR_700_command_slot *)SCp->host_scribble;
1602
1603                         if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1604                                 /* It wants to reply to some part of
1605                                  * our message */
1606 #ifdef NCR_700_DEBUG
1607                                 __u32 temp = NCR_700_readl(host, TEMP_REG);
1608                                 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1609                                 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)));
1610 #endif
1611                                 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1612                         } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1613                                   dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1614                                 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1615                                 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1616                                 int residual = NCR_700_data_residual(host);
1617                                 int i;
1618 #ifdef NCR_700_DEBUG
1619                                 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1620
1621                                 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1622                                        host->host_no, pun, lun,
1623                                        SGcount, data_transfer);
1624                                 scsi_print_command(SCp);
1625                                 if(residual) {
1626                                         printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1627                                        host->host_no, pun, lun,
1628                                        SGcount, data_transfer, residual);
1629                                 }
1630 #endif
1631                                 data_transfer += residual;
1632
1633                                 if(data_transfer != 0) {
1634                                         int count;
1635                                         __u32 pAddr;
1636
1637                                         SGcount--;
1638
1639                                         count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1640                                         DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1641                                         slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1642                                         slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1643                                         pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1644                                         pAddr += (count - data_transfer);
1645 #ifdef NCR_700_DEBUG
1646                                         if(pAddr != naddr) {
1647                                                 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);
1648                                         }
1649 #endif
1650                                         slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1651                                 }
1652                                 /* set the executed moves to nops */
1653                                 for(i=0; i<SGcount; i++) {
1654                                         slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1655                                         slot->SG[i].pAddr = 0;
1656                                 }
1657                                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1658                                 /* and pretend we disconnected after
1659                                  * the command phase */
1660                                 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1661                                 /* make sure all the data is flushed */
1662                                 NCR_700_flush_fifo(host);
1663                         } else {
1664                                 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1665                                 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1666                                        host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1667                                 NCR_700_internal_bus_reset(host);
1668                         }
1669
1670                 } else if(sstat0 & SCSI_GROSS_ERROR) {
1671                         printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1672                                host->host_no, pun, lun);
1673                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1674                 } else if(sstat0 & PARITY_ERROR) {
1675                         printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1676                                host->host_no, pun, lun);
1677                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1678                 } else if(dstat & SCRIPT_INT_RECEIVED) {
1679                         DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1680                                host->host_no, pun, lun));
1681                         resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1682                 } else if(dstat & (ILGL_INST_DETECTED)) {
1683                         printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1684                                "         Please email James.Bottomley@HansenPartnership.com with the details\n",
1685                                host->host_no, pun, lun,
1686                                dsp, dsp - hostdata->pScript);
1687                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1688                 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1689                         printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1690                                host->host_no, pun, lun, dstat);
1691                         NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1692                 }
1693
1694
1695                 /* NOTE: selection interrupt processing MUST occur
1696                  * after script interrupt processing to correctly cope
1697                  * with the case where we process a disconnect and
1698                  * then get reselected before we process the
1699                  * disconnection */
1700                 if(sstat0 & SELECTED) {
1701                         /* FIXME: It currently takes at least FOUR
1702                          * interrupts to complete a command that
1703                          * disconnects: one for the disconnect, one
1704                          * for the reselection, one to get the
1705                          * reselection data and one to complete the
1706                          * command.  If we guess the reselected
1707                          * command here and prepare it, we only need
1708                          * to get a reselection data interrupt if we
1709                          * guessed wrongly.  Since the interrupt
1710                          * overhead is much greater than the command
1711                          * setup, this would be an efficient
1712                          * optimisation particularly as we probably
1713                          * only have one outstanding command on a
1714                          * target most of the time */
1715
1716                         resume_offset = process_selection(host, dsp);
1717
1718                 }
1719
1720         }
1721
1722         if(resume_offset) {
1723                 if(hostdata->state != NCR_700_HOST_BUSY) {
1724                         printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1725                                host->host_no, resume_offset, resume_offset - hostdata->pScript);
1726                         hostdata->state = NCR_700_HOST_BUSY;
1727                 }
1728
1729                 DEBUG(("Attempting to resume at %x\n", resume_offset));
1730                 NCR_700_clear_fifo(host);
1731                 NCR_700_writel(resume_offset, host, DSP_REG);
1732         }
1733         /* There is probably a technical no-no about this: If we're a
1734          * shared interrupt and we got this interrupt because the
1735          * other device needs servicing not us, we're still going to
1736          * check our queued commands here---of course, there shouldn't
1737          * be any outstanding.... */
1738         if(hostdata->state == NCR_700_HOST_FREE) {
1739                 int i;
1740
1741                 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1742                         /* fairness: always run the queue from the last
1743                          * position we left off */
1744                         int j = (i + hostdata->saved_slot_position)
1745                                 % NCR_700_COMMAND_SLOTS_PER_HOST;
1746
1747                         if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1748                                 continue;
1749                         if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1750                                 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1751                                        host->host_no, &hostdata->slots[j],
1752                                        hostdata->slots[j].cmnd));
1753                                 hostdata->saved_slot_position = j + 1;
1754                         }
1755
1756                         break;
1757                 }
1758         }
1759  out_unlock:
1760         spin_unlock_irqrestore(host->host_lock, flags);
1761         return IRQ_RETVAL(handled);
1762 }
1763
1764 STATIC int
1765 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1766 {
1767         struct NCR_700_Host_Parameters *hostdata =
1768                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1769         __u32 move_ins;
1770         enum dma_data_direction direction;
1771         struct NCR_700_command_slot *slot;
1772
1773         if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1774                 /* We're over our allocation, this should never happen
1775                  * since we report the max allocation to the mid layer */
1776                 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1777                 return 1;
1778         }
1779         /* check for untagged commands.  We cannot have any outstanding
1780          * commands if we accept them.  Commands could be untagged because:
1781          *
1782          * - The tag negotiated bitmap is clear
1783          * - The blk layer sent and untagged command
1784          */
1785         if(NCR_700_get_depth(SCp->device) != 0
1786            && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1787                || !blk_rq_tagged(SCp->request))) {
1788                 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1789                        NCR_700_get_depth(SCp->device));
1790                 return SCSI_MLQUEUE_DEVICE_BUSY;
1791         }
1792         if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1793                 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1794                        NCR_700_get_depth(SCp->device));
1795                 return SCSI_MLQUEUE_DEVICE_BUSY;
1796         }
1797         NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1798
1799         /* begin the command here */
1800         /* no need to check for NULL, test for command_slot_count above
1801          * ensures a slot is free */
1802         slot = find_empty_slot(hostdata);
1803
1804         slot->cmnd = SCp;
1805
1806         SCp->scsi_done = done;
1807         SCp->host_scribble = (unsigned char *)slot;
1808         SCp->SCp.ptr = NULL;
1809         SCp->SCp.buffer = NULL;
1810
1811 #ifdef NCR_700_DEBUG
1812         printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1813         scsi_print_command(SCp);
1814 #endif
1815         if(blk_rq_tagged(SCp->request)
1816            && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1817            && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1818                 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1819                 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1820                 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1821         }
1822
1823         /* here we may have to process an untagged command.  The gate
1824          * above ensures that this will be the only one outstanding,
1825          * so clear the tag negotiated bit.
1826          *
1827          * FIXME: This will royally screw up on multiple LUN devices
1828          * */
1829         if(!blk_rq_tagged(SCp->request)
1830            && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1831                 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1832                 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1833         }
1834
1835         if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1836            && scsi_get_tag_type(SCp->device)) {
1837                 slot->tag = SCp->request->tag;
1838                 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1839                        slot->tag, slot);
1840         } else {
1841                 slot->tag = SCSI_NO_TAG;
1842                 /* must populate current_cmnd for scsi_find_tag to work */
1843                 SCp->device->current_cmnd = SCp;
1844         }
1845         /* sanity check: some of the commands generated by the mid-layer
1846          * have an eccentric idea of their sc_data_direction */
1847         if(!SCp->use_sg && !SCp->request_bufflen
1848            && SCp->sc_data_direction != DMA_NONE) {
1849 #ifdef NCR_700_DEBUG
1850                 printk("53c700: Command");
1851                 scsi_print_command(SCp);
1852                 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1853 #endif
1854                 SCp->sc_data_direction = DMA_NONE;
1855         }
1856
1857         switch (SCp->cmnd[0]) {
1858         case REQUEST_SENSE:
1859                 /* clear the internal sense magic */
1860                 SCp->cmnd[6] = 0;
1861                 /* fall through */
1862         default:
1863                 /* OK, get it from the command */
1864                 switch(SCp->sc_data_direction) {
1865                 case DMA_BIDIRECTIONAL:
1866                 default:
1867                         printk(KERN_ERR "53c700: Unknown command for data direction ");
1868                         scsi_print_command(SCp);
1869
1870                         move_ins = 0;
1871                         break;
1872                 case DMA_NONE:
1873                         move_ins = 0;
1874                         break;
1875                 case DMA_FROM_DEVICE:
1876                         move_ins = SCRIPT_MOVE_DATA_IN;
1877                         break;
1878                 case DMA_TO_DEVICE:
1879                         move_ins = SCRIPT_MOVE_DATA_OUT;
1880                         break;
1881                 }
1882         }
1883
1884         /* now build the scatter gather list */
1885         direction = SCp->sc_data_direction;
1886         if(move_ins != 0) {
1887                 int i;
1888                 int sg_count;
1889                 dma_addr_t vPtr = 0;
1890                 __u32 count = 0;
1891
1892                 if(SCp->use_sg) {
1893                         sg_count = dma_map_sg(hostdata->dev,
1894                                               SCp->request_buffer, SCp->use_sg,
1895                                               direction);
1896                 } else {
1897                         vPtr = dma_map_single(hostdata->dev,
1898                                               SCp->request_buffer,
1899                                               SCp->request_bufflen,
1900                                               direction);
1901                         count = SCp->request_bufflen;
1902                         slot->dma_handle = vPtr;
1903                         sg_count = 1;
1904                 }
1905
1906
1907                 for(i = 0; i < sg_count; i++) {
1908
1909                         if(SCp->use_sg) {
1910                                 struct scatterlist *sg = SCp->request_buffer;
1911
1912                                 vPtr = sg_dma_address(&sg[i]);
1913                                 count = sg_dma_len(&sg[i]);
1914                         }
1915
1916                         slot->SG[i].ins = bS_to_host(move_ins | count);
1917                         DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1918                                i, count, slot->SG[i].ins, (unsigned long)vPtr));
1919                         slot->SG[i].pAddr = bS_to_host(vPtr);
1920                 }
1921                 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1922                 slot->SG[i].pAddr = 0;
1923                 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1924                 DEBUG((" SETTING %08lx to %x\n",
1925                        (&slot->pSG[i].ins),
1926                        slot->SG[i].ins));
1927         }
1928         slot->resume_offset = 0;
1929         slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1930                                     sizeof(SCp->cmnd), DMA_TO_DEVICE);
1931         NCR_700_start_command(SCp);
1932         return 0;
1933 }
1934
1935 STATIC int
1936 NCR_700_abort(struct scsi_cmnd * SCp)
1937 {
1938         struct NCR_700_command_slot *slot;
1939
1940         scmd_printk(KERN_INFO, SCp,
1941                 "New error handler wants to abort command\n\t");
1942         scsi_print_command(SCp);
1943
1944         slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1945
1946         if(slot == NULL)
1947                 /* no outstanding command to abort */
1948                 return SUCCESS;
1949         if(SCp->cmnd[0] == TEST_UNIT_READY) {
1950                 /* FIXME: This is because of a problem in the new
1951                  * error handler.  When it is in error recovery, it
1952                  * will send a TUR to a device it thinks may still be
1953                  * showing a problem.  If the TUR isn't responded to,
1954                  * it will abort it and mark the device off line.
1955                  * Unfortunately, it does no other error recovery, so
1956                  * this would leave us with an outstanding command
1957                  * occupying a slot.  Rather than allow this to
1958                  * happen, we issue a bus reset to force all
1959                  * outstanding commands to terminate here. */
1960                 NCR_700_internal_bus_reset(SCp->device->host);
1961                 /* still drop through and return failed */
1962         }
1963         return FAILED;
1964
1965 }
1966
1967 STATIC int
1968 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1969 {
1970         DECLARE_COMPLETION_ONSTACK(complete);
1971         struct NCR_700_Host_Parameters *hostdata =
1972                 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1973
1974         scmd_printk(KERN_INFO, SCp,
1975                 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1976         scsi_print_command(SCp);
1977
1978         /* In theory, eh_complete should always be null because the
1979          * eh is single threaded, but just in case we're handling a
1980          * reset via sg or something */
1981         spin_lock_irq(SCp->device->host->host_lock);
1982         while (hostdata->eh_complete != NULL) {
1983                 spin_unlock_irq(SCp->device->host->host_lock);
1984                 msleep_interruptible(100);
1985                 spin_lock_irq(SCp->device->host->host_lock);
1986         }
1987
1988         hostdata->eh_complete = &complete;
1989         NCR_700_internal_bus_reset(SCp->device->host);
1990
1991         spin_unlock_irq(SCp->device->host->host_lock);
1992         wait_for_completion(&complete);
1993         spin_lock_irq(SCp->device->host->host_lock);
1994
1995         hostdata->eh_complete = NULL;
1996         /* Revalidate the transport parameters of the failing device */
1997         if(hostdata->fast)
1998                 spi_schedule_dv_device(SCp->device);
1999
2000         spin_unlock_irq(SCp->device->host->host_lock);
2001         return SUCCESS;
2002 }
2003
2004 STATIC int
2005 NCR_700_host_reset(struct scsi_cmnd * SCp)
2006 {
2007         scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
2008         scsi_print_command(SCp);
2009
2010         spin_lock_irq(SCp->device->host->host_lock);
2011
2012         NCR_700_internal_bus_reset(SCp->device->host);
2013         NCR_700_chip_reset(SCp->device->host);
2014
2015         spin_unlock_irq(SCp->device->host->host_lock);
2016
2017         return SUCCESS;
2018 }
2019
2020 STATIC void
2021 NCR_700_set_period(struct scsi_target *STp, int period)
2022 {
2023         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2024         struct NCR_700_Host_Parameters *hostdata =
2025                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2026
2027         if(!hostdata->fast)
2028                 return;
2029
2030         if(period < hostdata->min_period)
2031                 period = hostdata->min_period;
2032
2033         spi_period(STp) = period;
2034         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2035                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2036         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2037 }
2038
2039 STATIC void
2040 NCR_700_set_offset(struct scsi_target *STp, int offset)
2041 {
2042         struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2043         struct NCR_700_Host_Parameters *hostdata =
2044                 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2045         int max_offset = hostdata->chip710
2046                 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2047
2048         if(!hostdata->fast)
2049                 return;
2050
2051         if(offset > max_offset)
2052                 offset = max_offset;
2053
2054         /* if we're currently async, make sure the period is reasonable */
2055         if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2056                                     spi_period(STp) > 0xff))
2057                 spi_period(STp) = hostdata->min_period;
2058
2059         spi_offset(STp) = offset;
2060         spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2061                             NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2062         spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2063 }
2064
2065 STATIC int
2066 NCR_700_slave_alloc(struct scsi_device *SDp)
2067 {
2068         SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2069                                 GFP_KERNEL);
2070
2071         if (!SDp->hostdata)
2072                 return -ENOMEM;
2073
2074         return 0;
2075 }
2076
2077 STATIC int
2078 NCR_700_slave_configure(struct scsi_device *SDp)
2079 {
2080         struct NCR_700_Host_Parameters *hostdata =
2081                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2082
2083         /* to do here: allocate memory; build a queue_full list */
2084         if(SDp->tagged_supported) {
2085                 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2086                 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2087                 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2088         } else {
2089                 /* initialise to default depth */
2090                 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2091         }
2092         if(hostdata->fast) {
2093                 /* Find the correct offset and period via domain validation */
2094                 if (!spi_initial_dv(SDp->sdev_target))
2095                         spi_dv_device(SDp);
2096         } else {
2097                 spi_offset(SDp->sdev_target) = 0;
2098                 spi_period(SDp->sdev_target) = 0;
2099         }
2100         return 0;
2101 }
2102
2103 STATIC void
2104 NCR_700_slave_destroy(struct scsi_device *SDp)
2105 {
2106         kfree(SDp->hostdata);
2107         SDp->hostdata = NULL;
2108 }
2109
2110 static int
2111 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2112 {
2113         if (depth > NCR_700_MAX_TAGS)
2114                 depth = NCR_700_MAX_TAGS;
2115
2116         scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2117         return depth;
2118 }
2119
2120 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2121 {
2122         int change_tag = ((tag_type ==0 &&  scsi_get_tag_type(SDp) != 0)
2123                           || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2124         struct NCR_700_Host_Parameters *hostdata =
2125                 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2126
2127         scsi_set_tag_type(SDp, tag_type);
2128
2129         /* We have a global (per target) flag to track whether TCQ is
2130          * enabled, so we'll be turning it off for the entire target here.
2131          * our tag algorithm will fail if we mix tagged and untagged commands,
2132          * so quiesce the device before doing this */
2133         if (change_tag)
2134                 scsi_target_quiesce(SDp->sdev_target);
2135
2136         if (!tag_type) {
2137                 /* shift back to the default unqueued number of commands
2138                  * (the user can still raise this) */
2139                 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2140                 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2141         } else {
2142                 /* Here, we cleared the negotiation flag above, so this
2143                  * will force the driver to renegotiate */
2144                 scsi_activate_tcq(SDp, SDp->queue_depth);
2145                 if (change_tag)
2146                         NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2147         }
2148         if (change_tag)
2149                 scsi_target_resume(SDp->sdev_target);
2150
2151         return tag_type;
2152 }
2153
2154 static ssize_t
2155 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2156 {
2157         struct scsi_device *SDp = to_scsi_device(dev);
2158
2159         return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2160 }
2161
2162 static struct device_attribute NCR_700_active_tags_attr = {
2163         .attr = {
2164                 .name =         "active_tags",
2165                 .mode =         S_IRUGO,
2166         },
2167         .show = NCR_700_show_active_tags,
2168 };
2169
2170 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2171         &NCR_700_active_tags_attr,
2172         NULL,
2173 };
2174
2175 EXPORT_SYMBOL(NCR_700_detect);
2176 EXPORT_SYMBOL(NCR_700_release);
2177 EXPORT_SYMBOL(NCR_700_intr);
2178
2179 static struct spi_function_template NCR_700_transport_functions =  {
2180         .set_period     = NCR_700_set_period,
2181         .show_period    = 1,
2182         .set_offset     = NCR_700_set_offset,
2183         .show_offset    = 1,
2184 };
2185
2186 static int __init NCR_700_init(void)
2187 {
2188         NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2189         if(!NCR_700_transport_template)
2190                 return -ENODEV;
2191         return 0;
2192 }
2193
2194 static void __exit NCR_700_exit(void)
2195 {
2196         spi_release_transport(NCR_700_transport_template);
2197 }
2198
2199 module_init(NCR_700_init);
2200 module_exit(NCR_700_exit);
2201