drivers/scsi/53c7,8xx.c

/* */
This source file includes following definitions.
internal_setup
setup_wrapper
normal_init
pci_init
NCR53c7xx_detect
NCR53c8x0_init_fixup
NCR53c8xx_run_tests
NCR53c8xx_dsa_fixup
abnormal_finished
intr_break
asynchronous
synchronous
NCR53c8x0_dstat_sir_intr
debugger_fn_bc
debugger_fn_bl
debugger_fn_bs
debugger_user_write
debugger_user_read
debugger_kernel_write
NCR53c8x0_soft_reset
create_cmd
NCR53c7xx_queue_command
fix_pointers
intr_scsi
NCR53c7x0_intr
abort_connected
intr_phase_mismatch
intr_dma
print_insn
NCR53c7xx_abort
NCR53c7xx_reset
print_dsa
   1 /* 
   2  * Set these options for all host adapters.
   3  *      - Memory mapped IO does not work.
   4  *      - Test 1 does a bus mastering test, which will help
   5  *        weed out brain damaged main boards.
   6  */
   7 
   8 #define PERM_OPTIONS (OPTION_IO_MAPPED|OPTION_DEBUG_TEST1)
   9 
  10 /*
  11  * Define SCSI_MALLOC to use scsi_malloc instead of kmalloc.  Other than
  12  * preventing deadlock, I'm not sure why we'd want to do this.
  13  */
  14 
  15 #define SCSI_MALLOC
  16 
  17 /*
  18  * Sponsored by 
  19  *      iX Multiuser Multitasking Magazine
  20  *      Hannover, Germany
  21  *      hm@ix.de
  22  *
  23  * Copyright 1993, 1994 Drew Eckhardt
  24  *      Visionary Computing 
  25  *      (Unix and Linux consulting and custom programming)
  26  *      drew@Colorado.EDU
  27  *      +1 (303) 786-7975
  28  *
  29  * TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
  30  * 
  31  * PRE-ALPHA
  32  *
  33  * For more information, please consult 
  34  *
  35  *
  36  * NCR 53C700/53C700-66
  37  * SCSI I/O Processor
  38  * Data Manual
  39  *
  40  * NCR53C710 
  41  * SCSI I/O Processor
  42  * Programmer's Guide
  43  *
  44  * NCR 53C810
  45  * PCI-SCSI I/O Processor
  46  * Data Manual
  47  *
  48  * NCR 53C810/53C820
  49  * PCI-SCSI I/O Processor Design In Guide
  50  *
  51  * NCR Microelectronics
  52  * 1635 Aeroplaza Drive
  53  * Colorado Springs, CO 80916
  54  * +1 (719) 578-3400
  55  *
  56  * Toll free literature number
  57  * +1 (800) 334-5454
  58  *
  59  * PCI BIOS Specification Revision
  60  * PCI Local Bus Specification
  61  * PCI System Design Guide
  62  *
  63  * PCI Special Interest Group
  64  * M/S HF3-15A
  65  * 5200 N.E. Elam Young Parkway
  66  * Hillsboro, Oregon 97124-6497
  67  * +1 (503) 696-2000 
  68  * +1 (800) 433-5177
  69  */
  70 
  71 /*
  72  * Design issues : 
  73  * The cumulative latency needed to propagate a read/write request 
  74  * through the filesystem, buffer cache, driver stacks, SCSI host, and 
  75  * SCSI device is ultimately the limiting factor in throughput once we 
  76  * have a sufficiently fast host adapter.
  77  *  
  78  * So, to maximize performance we want to keep the ratio of latency to data 
  79  * transfer time to a minimum by
  80  * 1.  Minimizing the total number of commands sent (typical command latency
  81  *      including drive and busmastering host overhead is as high as 4.5ms)
  82  *      to transfer a given amount of data.  
  83  *
  84  *      This is accomplished by placing no arbitrary limit on the number
  85  *      of scatter/gather buffers supported, since we can transfer 1K
  86  *      per scatter/gather buffer without Eric's cluster patches, 
  87  *      4K with.  
  88  *
  89  * 2.  Minimizing the number of fatal interrupts serviced, since
  90  *      fatal interrupts halt the SCSI I/O processor.  Basically,
  91  *      this means offloading the practical maximum amount of processing 
  92  *      to the SCSI chip.
  93  * 
  94  *      On the NCR53c810/820,  this is accomplished by using 
  95  *              interrupt-on-the-fly signals with the DSA address as a 
  96  *              parameter when commands complete, and only handling fatal 
  97  *              errors and SDTR / WDTR  messages in the host code.
  98  *
  99  *      On the NCR53c710/720, interrupts are generated as on the NCR53c8x0,
 100  *              only the lack of a interrupt-on-the-fly facility complicates
 101  *              things.  
 102  *              
 103  *      On the NCR53c700 and NCR53c700-66, operations that were done via 
 104  *              indirect, table mode on the more advanced chips have
 105  *              been replaced by calls through a jump table which 
 106  *              acts as a surrogate for the DSA.  Unfortunately, this 
 107  *              means that we must service an interrupt for each 
 108  *              disconnect/reconnect.
 109  * 
 110  * 3.  Eliminating latency by pipelining operations at the different levels.
 111  *      
 112  *      This driver allows a configurable number of commands to be enqueued
 113  *      for each target/lun combination (experimentally, I have discovered
 114  *      that two seems to work best) and will ultimately allow for 
 115  *      SCSI-II tagged queueing.
 116  *      
 117  *
 118  * Architecture : 
 119  * This driver is built around two queues of commands waiting to 
 120  * be executed - the Linux issue queue, and the shared Linux/NCR  
 121  * queue which are manipulated by the NCR53c7xx_queue_command and 
 122  * NCR53c7x0_intr routines.
 123  *
 124  * When the higher level routines pass a SCSI request down to 
 125  * NCR53c7xx_queue_command, it looks to see if that target/lun 
 126  * is currently busy. If not, the command is inserted into the 
 127  * shared Linux/NCR queue, otherwise it is inserted into the Linux 
 128  * queue.
 129  *
 130  * As commands are completed, the interrupt routine is triggered,
 131  * looks for commands in the linked list of completed commands with
 132  * valid status, removes these commands from the list, calls 
 133  * the done routine, and flags their target/luns as not busy.
 134  *
 135  * Due to limitations in the intelligence of the NCR chips, certain
 136  * concessions are made.  In many cases, it is easier to dynamically 
 137  * generate/fixup code rather than calculate on the NCR at run time.  
 138  * So, code is generated or fixed up for
 139  *
 140  * - Handling data transfers, using a variable number of MOVE instructions
 141  *      interspersed with CALL MSG_IN, WHEN MSGIN instructions.
 142  *
 143  *      The DATAIN and DATAOUT routines are separate, so that an incorrect
 144  *      direction can be trapped, and space isn't wasted. 
 145  *
 146  *      It may turn out that we're better off using some sort 
 147  *      of table indirect instruction in a loop with a variable
 148  *      sized table on the NCR53c710 and newer chips.
 149  *
 150  * - Checking for reselection (NCR53c710 and better)
 151  *
 152  * - Handling the details of SCSI context switches (NCR53c710 and better),
 153  *      such as reprogramming appropriate synchronous parameters, 
 154  *      removing the dsa structure from the NCR's queue of outstanding
 155  *      commands, etc.
 156  *
 157  */
 158 
 159 #include <asm/io.h>
 160 #include <asm/system.h>
 161 #include <linux/delay.h>
 162 #include <linux/signal.h>
 163 #include <linux/sched.h>
 164 #include <linux/errno.h>
 165 #include <linux/bios32.h>
 166 #include <linux/pci.h>
 167 #include <linux/string.h>
 168 #include "../block/blk.h"
 169 #include "scsi.h"
 170 #include "hosts.h"
 171 #include "53c7,8xx.h"
 172 #include "constants.h"
 173 #include "sd.h"
 174 
 175 static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int result);
 176 static int NCR53c8xx_run_tests (struct Scsi_Host *host);
 177 static int NCR53c8xx_script_len;
 178 static void NCR53c7x0_intr (int irq);
 179 static void intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd 
 180     *cmd);
 181 static void intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd);
 182 static void print_dsa (struct Scsi_Host *host, unsigned long *dsa);
 183 static int print_insn (struct Scsi_Host *host, unsigned long *insn,
 184     char *prefix, int kernel);
 185 
 186 static void NCR53c8xx_dsa_fixup (struct NCR53c7x0_cmd *cmd);
 187 static void NCR53c8x0_init_fixup (struct Scsi_Host *host);
 188 static int NCR53c8x0_dstat_sir_intr (struct Scsi_Host *host, struct 
 189     NCR53c7x0_cmd *cmd);
 190 static void NCR53c8x0_soft_reset (struct Scsi_Host *host);
 191 
 192 static struct Scsi_Host *first_host = NULL;     /* Head of list of NCR boards */
 193 static Scsi_Host_Template *the_template = NULL; 
 194 
 195 /* Allocate storage space for constant messages, etc. */
 196 
 197 static long NCR53c7xx_zero = 0;                 
 198 static long NCR53c7xx_sink;
 199 static char NCR53c7xx_msg_reject = MESSAGE_REJECT;
 200 static char NCR53c7xx_msg_abort = ABORT;
 201 static char NCR53c7xx_msg_nop = NOP;
 202 
 203 /* Buffer for commands run before *malloc() works */
 204 /* 
 205  * XXX - if need be, replace this with normal wait.
 206  */
 207 static int scan_scsis_buf_busy = 0;
 208 static char scan_scsis_buf[512];
 209 
 210 /*
 211  * TODO : 
 212  *
 213  * 1.  Implement single step / trace code?
 214  * 
 215  * 2.  The initial code has been tested on the NCR53c810.  I don't 
 216  *     have access to NCR53c700, 700-66 (Forex boards), NCR53c710
 217  *     (NCR Pentium systems), NCR53c720, or NCR53c820 boards to finish
 218  *     development on those platforms.
 219  *
 220  *     NCR53c820/720 - need to add wide transfer support, including WDTR 
 221  *              negotiation, programming of wide transfer capabilities
 222  *              on reselection and table indirect selection.
 223  *
 224  *     NCR53c720/710 - need to add fatal interrupt or GEN code for 
 225  *              command completion signaling.   Need to take care of 
 226  *              ADD WITH CARRY instructions since carry is unimplemented.
 227  *              Also need to modify all SDID, SCID, etc. registers,
 228  *              and table indirect select code since these use bit
 229  *              fielded (ie 1<<target) instead of binary encoded
 230  *              target ids.  Also, SCNTL3 is _not_ automatically
 231  *              programmed on selection, so we need to add more code.
 232  * 
 233  *     NCR53c700/700-66 - need to add code to refix addresses on 
 234  *              every nexus change, eliminate all table indirect code.
 235  *
 236  * 3.  The NCR53c7x0 series is very popular on other platforms that 
 237  *     could be running Linux - ie, some high performance AMIGA SCSI 
 238  *     boards use it.  
 239  *      
 240  *     So, I should include #ifdef'd code so that it is 
 241  *     compatible with these systems.
 242  *      
 243  *     Specifically, the little Endian assumptions I made in my 
 244  *     bit fields need to change, and if the NCR doesn't see memory
 245  *     the right way, we need to provide options to reverse words
 246  *     when the scripts are relocated.
 247  *
 248  * 4.  Implement code to include page table entries for the 
 249  *     area occupied by memory mapped boards so we don't have 
 250  *     to use the potentially slower I/O accesses.
 251  */
 252 
 253 /* 
 254  * XXX - note that my assembler was modified so that internally,
 255  * the names used can take a prefix, so that there is no conflict
 256  * between multiple copies of the same script assembled with 
 257  * different defines.
 258  *
 259  *
 260  * Allow for simultaneous existence of multiple SCSI scripts so we 
 261  * can have a single driver binary for all of the family.
 262  *
 263  * - one for NCR53c700 and NCR53c700-66 chips   (not yet supported)
 264  * - one for NCR53c710 and NCR53c720 chips      (not yet supported)
 265  * - one for NCR53c810 and NCR53c820 chips      (only the NCR53c810 is
 266  *      currently supported)
 267  *
 268  * For the very similar chips, we should probably hack the fixup code
 269  * and interrupt code so that it works everywhere, but I suspect the 
 270  * NCR53c700 is going
 271  * to need it's own fixup routine.
 272  */
 273 
 274 /*
 275  * Use to translate between device IDs of various types.
 276  */
 277 
 278 struct pci_chip {
 279     unsigned short pci_device_id;
 280     int chip;
 281     int max_revision;
 282     int min_revision;
 283 };
 284 
 285 static struct pci_chip pci_chip_ids[] = { 
 286     {PCI_DEVICE_ID_NCR_53C810, 810, 1, 1}, 
 287     {PCI_DEVICE_ID_NCR_53C815, 815, 2, 3},
 288     {PCI_DEVICE_ID_NCR_53C820, 820, -1, -1},
 289     {PCI_DEVICE_ID_NCR_53C825, 825, -1, -1}
 290 };
 291 
 292 #define NPCI_CHIP_IDS (sizeof (pci_chip_ids) / sizeof(pci_chip_ids[0]))
 293 
 294 
 295 /* Forced detection and autoprobe code for various hardware */
 296 
 297 static struct override {
 298     int chip;   /* 700, 70066, 710, 720, 810, 820 */
 299     int board;  /* Any special board level gunk */
 300     unsigned pci:1;
 301     union {
 302         struct {
 303             int base;   /* Memory address - indicates memory mapped regs */
 304             int io_port;/* I/O port address - indicates I/O mapped regs */
 305             int irq;    /* IRQ line */          
 306             int dma;    /* DMA channel          - often none */
 307         } normal;
 308         struct {
 309             int bus;
 310             int device;
 311             int function;
 312         } pci;
 313     } data;
 314     int options;
 315 } overrides [4] = {{0,},};
 316 static int commandline_current = 0;
 317 static int no_overrides = 0;
 318 
 319 #if 0
 320 #define OVERRIDE_LIMIT (sizeof(overrides) / sizeof(struct override))
 321 #else
 322 #define OVERRIDE_LIMIT commandline_current
 323 #endif
 324 
 325 /*
 326  * Function : static internal_setup(int board, int chip, char *str, int *ints)
 327  *
 328  * Purpose : LILO command line initialization of the overrides array,
 329  * 
 330  * Inputs : board - currently, unsupported.  chip - 700, 70066, 710, 720
 331  *      810, 815, 820, 825, although currently only the NCR53c810 is 
 332  *      supported.
 333  * 
 334  */
 335 
 336 static void internal_setup(int board, int chip, char *str, int *ints) {
     /*  */
 337     unsigned char pci;          /* Specifies a PCI override, with bus, device,
 338                                    function */
 339 
 340     pci = (str && !strcmp (str, "pci")) ? 1 : 0;
 341     
 342 /*
 343  * Override syntaxes are as follows : 
 344  * ncr53c700,ncr53c700-66,ncr53c710,ncr53c720=mem,io,irq,dma
 345  * ncr53c810,ncr53c820,ncr53c825=mem,io,irq or pci,bus,device,function
 346  */
 347 
 348     if (commandline_current < OVERRIDE_LIMIT) {
 349         overrides[commandline_current].pci = pci ? 1 : 0;
 350         if (!pci) {
 351             overrides[commandline_current].data.normal.base = ints[1];
 352             overrides[commandline_current].data.normal.io_port = ints[2];
 353             overrides[commandline_current].data.normal.irq = ints[3];
 354             overrides[commandline_current].data.normal.dma = (ints[0] >= 4) ?
 355                 ints[4] : DMA_NONE;
 356             overrides[commandline_current].options = (ints[0] >= 5) ?
 357                 ints[5] : 0;
 358         } else {
 359             overrides[commandline_current].data.pci.bus = ints[1];
 360             overrides[commandline_current].data.pci.device = ints[2];
 361             overrides[commandline_current].data.pci.device = ints[3];
 362             overrides[commandline_current].options = (ints[0] >= 4) ?
 363                 ints[4] : 0;
 364         }
 365         overrides[commandline_current].board = board;
 366         overrides[commandline_current].chip = chip;
 367         ++commandline_current;
 368         ++no_overrides;
 369     } else {
 370         printk ("53c7,7x0.c:internal_setup() : too many overrides\n");
 371     }
 372 }
 373 
 374 /*
 375  * XXX - we might want to implement a single override function
 376  *       with a chip type field, revamp the command line configuration,
 377  *       etc.
 378  */
 379 
 380 #define setup_wrapper(x)                                \
 381 void ncr53c##x##_setup (char *str, int *ints) {         \
 382     internal_setup (BOARD_GENERIC, x, str, ints);       \
 383 }
 384 
 385 setup_wrapper(700)
     /*  */
 386 setup_wrapper(70066)
 387 setup_wrapper(710)
 388 setup_wrapper(720)
 389 setup_wrapper(810)
 390 setup_wrapper(815)
 391 setup_wrapper(820)
 392 setup_wrapper(825)
 393 
 394 /* 
 395  * Function : static int NCR53c7x0_init (struct Scsi_Host *host)
 396  *
 397  * Purpose :  initialize the internal structures for a given SCSI host
 398  *
 399  * Inputs : host - pointer to this host adapter's structure/ 
 400  *
 401  * Preconditions : when this function is called, the chip_type 
 402  *      field of the hostdata structure MUST have been set.
 403  */
 404 
 405 static int NCR53c7x0_init (struct Scsi_Host *host) {
 406     NCR53c7x0_local_declare();
 407     /* unsigned char tmp; */
 408     int i, j, ccf;
 409     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
 410         host->hostdata;
 411     struct Scsi_Host *search;
 412     NCR53c7x0_local_setup(host);
 413 
 414     switch (hostdata->chip) {
 415     case 810:
 416     case 815:
 417     case 820:
 418     case 825:
 419         hostdata->dstat_sir_intr = NCR53c8x0_dstat_sir_intr;
 420         hostdata->init_save_regs = NULL;
 421         hostdata->dsa_fixup = NCR53c8xx_dsa_fixup;
 422         hostdata->init_fixup = NCR53c8x0_init_fixup;
 423         hostdata->soft_reset = NCR53c8x0_soft_reset;
 424         hostdata->run_tests = NCR53c8xx_run_tests;
 425 /* Is the SCSI clock ever anything else on these chips? */
 426         hostdata->scsi_clock = 40000000;
 427         break;
 428     default:
 429         printk ("scsi%d : chip type of %d is not supported yet, detaching.\n",
 430             host->host_no, hostdata->chip);
 431         scsi_unregister (host);
 432         return -1;
 433     }
 434 
 435     /*
 436      * Set up an interrupt handler if we aren't already sharing an IRQ
 437      * with another board.
 438      */
 439 
 440     for (search = first_host; search && (search->hostt == the_template) &&
 441         (search->irq != host->irq); search=search->next);
 442 
 443     if (!search) {
 444         if (request_irq(host->irq, NCR53c7x0_intr, SA_INTERRUPT, "53c7,8xx")) {
 445             printk("scsi%d : IRQ%d not free, detaching\n", 
 446                 host->host_no, host->irq);
 447             scsi_unregister (host);
 448             return -1;
 449         } 
 450     } else {
 451         printk("scsi%d : using interrupt handler previously installed for scsi%d\n",
 452             host->host_no, search->host_no);
 453     }
 454 
 455     printk ("scsi%d : using %s mapped access\n", host->host_no, 
 456         (hostdata->options & OPTION_MEMORY_MAPPED) ? "memory" : 
 457          "io");
 458 
 459     hostdata->dmode = (hostdata->chip == 700 || hostdata->chip == 70066) ? 
 460         DMODE_REG_00 : DMODE_REG_10;
 461     hostdata->istat = ((hostdata->chip / 100) == 8) ? 
 462         ISTAT_REG_800 : ISTAT_REG_700;
 463 
 464 /* 
 465  * XXX - the NCR53c700 uses bitfielded registers for SCID, SDID, etc,
 466  *      as does the 710 with one bit per SCSI ID.  Conversely, the NCR
 467  *      uses a normal, 3 bit binary representation of these values.
 468  *
 469  * Get the rest of the NCR documentation, and FIND OUT where the change
 470  * was.
 471  */
 472 #if 0
 473     tmp = hostdata->this_id_mask = NCR53c7x0_read8(SCID_REG);
 474     for (host->this_id = 0; tmp != 1; tmp >>=1, ++host->this_id);
 475 #else
 476     host->this_id = NCR53c7x0_read8(SCID_REG) & 7;
 477     hostdata->this_id_mask = 1 << host->this_id;
 478 #endif
 479 
 480     printk("scsi%d : using initiator ID %d\n", host->host_no,
 481         host->this_id);
 482 
 483     /*
 484      * Save important registers to allow a soft reset.
 485      */
 486 
 487     if ((hostdata->chip / 100) == 8) {
 488     /* 
 489      * CTEST4 controls burst mode disable.
 490      */
 491         hostdata->saved_ctest4 = NCR53c7x0_read8(CTEST4_REG_800) & 
 492             CTEST4_800_SAVE;
 493     } else {
 494     /*
 495      * CTEST7 controls cache snooping, burst mode, and support for 
 496      * external differential drivers.
 497      */
 498         hostdata->saved_ctest7 = NCR53c7x0_read8(CTEST7_REG) & CTEST7_SAVE;
 499     }
 500 
 501     /*
 502      * On NCR53c700 series chips, DCNTL controls the SCSI clock divisor,
 503      * on 800 series chips, it allows for a totem-pole IRQ driver.
 504      */
 505     hostdata->saved_dcntl = NCR53c7x0_read8(DCNTL_REG);
 506     
 507     if ((hostdata->chip / 100) == 8)
 508         printk ("scsi%d : using %s interrupts.\n", host->host_no,
 509             (hostdata->saved_dcntl & DCNTL_800_IRQM) ? "level active" : 
 510             "edge triggered");
 511 
 512     /*
 513      * DMODE controls DMA burst length, and on 700 series chips,
 514      * 286 mode and bus width  
 515      */
 516     hostdata->saved_dmode = NCR53c7x0_read8(hostdata->dmode);
 517 
 518     /* 
 519      * Now that burst length and enabled/disabled status is known, 
 520      * clue the user in on it.
 521      */
 522    
 523     if ((hostdata->chip / 100) == 8) {
 524         if (hostdata->saved_ctest4 & CTEST4_800_BDIS) {
 525             printk ("scsi%d : burst mode disabled\n", host->host_no);
 526         } else {
 527             switch (hostdata->saved_dmode & DMODE_BL_MASK) {
 528             case DMODE_BL_2: i = 2; break;
 529             case DMODE_BL_4: i = 4; break;
 530             case DMODE_BL_8: i = 8; break;
 531             case DMODE_BL_16: i = 16; break;
 532             }
 533             printk ("scsi%d ; burst length %d\n", host->host_no, i);
 534         }
 535     }
 536 
 537     /*
 538      * On NCR53c810 and NCR53c820 chips, SCNTL3 contails the synchronous
 539      * and normal clock conversion factors.
 540      */
 541     if (hostdata->chip / 100 == 8)  {
 542         hostdata->saved_scntl3 = NCR53c7x0_read8(SCNTL3_REG_800);
 543         ccf = hostdata->saved_scntl3 & SCNTL3_800_CCF_MASK;
 544     } else
 545         ccf = 0;
 546 
 547     /*
 548      * If we don't have a SCSI clock programmed, pick one on the upper
 549      * bound of that allowed by NCR so that our transfers err on the 
 550      * slow side, since transfer period must be >= the agreed 
 551      * appon period.
 552      */
 553 
 554     if (!hostdata->scsi_clock) 
 555         switch(ccf) {
 556         case 1: hostdata->scsi_clock = 25000000; break; /* Divide by 1.0 */
 557         case 2: hostdata->scsi_clock = 37500000; break; /* Divide by 1.5 */
 558         case 3: hostdata->scsi_clock = 50000000; break; /* Divide by 2.0 */
 559         case 0:                                         /* Divide by 3.0 */
 560         case 4: hostdata->scsi_clock = 66000000; break; 
 561         default: 
 562             printk ("scsi%d : clock conversion factor %d unknown.\n"
 563                     "         synchronous transfers disabled\n",
 564                     host->host_no, ccf);
 565             hostdata->options &= ~OPTION_SYNCHRONOUS;
 566             hostdata->scsi_clock = 0; 
 567         }
 568 
 569     printk ("scsi%d : using %dMHz SCSI clock\n", host->host_no, 
 570         hostdata->scsi_clock / 1000000);
 571     /*
 572      * Initialize per-target structures, including busy flags and 
 573      * synchronous transfer parameters.
 574      */
 575 
 576     for (i = 0; i < 8; ++i) {
 577         for (j = 0; j < 8; ++j)
 578             hostdata->busy[i][j] = 0;
 579         /* 
 580          * NCR53c700 and NCR53c700-66 chips lack the DSA and use a 
 581          * different architecture.  For chips using the DSA architecture,
 582          * initialize the per-target synchronous parameters. 
 583          */
 584         if (hostdata->chip != 700 && hostdata->chip != 70066) {
 585             hostdata->sync[i].select_indirect |= (i << 16); 
 586             /* XXX - program SCSI script for immediate return */ 
 587             hostdata->sync[i].script[0] = (DCMD_TYPE_TCI|DCMD_TCI_OP_RETURN) << 24 | 
 588                 DBC_TCI_TRUE;
 589             switch (hostdata->chip) {
 590             /* Clock divisor */
 591             case 825:
 592             case 820:
 593                 /* Fall through to 810 */
 594             case 815:
 595             case 810:
 596                 hostdata->sync[i].select_indirect |= (hostdata->saved_scntl3) << 24;
 597                 break;
 598             default:
 599             }
 600         }
 601     }
 602 
 603     hostdata->issue_queue = hostdata->running_list = 
 604         hostdata->finished_queue = NULL;
 605     hostdata->issue_dsa_head = 
 606         hostdata->issue_dsa_tail = NULL;
 607 
 608     if (hostdata->init_save_regs)
 609         hostdata->init_save_regs (host);
 610     if (hostdata->init_fixup)
 611         hostdata->init_fixup (host);
 612 
 613     if (!the_template) {
 614         the_template = host->hostt;
 615         first_host = host;
 616     }
 617 
 618     hostdata->idle = 1;
 619 
 620     /* 
 621      * Linux SCSI drivers have always been plagued with initialization 
 622      * problems - some didn't work with the BIOS disabled since they expected
 623      * initialization from it, some didn't work when the networking code
 624      * was enabled and registers got scrambled, etc.
 625      *
 626      * To avoid problems like this, in the future, we will do a soft 
 627      * reset on the SCSI chip, taking it back to a sane state.
 628      */
 629 
 630     hostdata->soft_reset (host);
 631 
 632     hostdata->debug_count_limit = -1;
 633     hostdata->intrs = -1;
 634     hostdata->expecting_iid = 0;
 635     hostdata->expecting_sto = 0;
 636 
 637     if ((hostdata->run_tests && hostdata->run_tests(host) == -1) ||
 638         (hostdata->options & OPTION_DEBUG_TESTS_ONLY)) {
 639         /* XXX Should disable interrupts, etc. here */
 640         scsi_unregister (host);
 641         return -1;
 642     } else 
 643         return 0;
 644 }
 645 
 646 /* 
 647  * Function : static int normal_init(Scsi_Host_Template *tpnt, int board, 
 648  *      int chip, int base, int io_port, int irq, int dma, int pcivalid,
 649  *      unsigned char pci_bus, unsigned char pci_device_fn,
 650  *      int options);
 651  *
 652  * Purpose : initializes a NCR53c7,8x0 based on base addresses,
 653  *      IRQ, and DMA channel.   
 654  *      
 655  *      Useful where a new NCR chip is backwards compatible with
 656  *      a supported chip, but the DEVICE ID has changed so it 
 657  *      doesn't show up when the autoprobe does a pcibios_find_device.
 658  *
 659  * Inputs : tpnt - Template for this SCSI adapter, board - board level
 660  *      product, chip - 810, 820, or 825, bus - PCI bus, device_fn -
 661  *      device and function encoding as used by PCI BIOS calls.
 662  * 
 663  * Returns : 0 on success, -1 on failure.
 664  *
 665  */
 666 
 667 static int normal_init (Scsi_Host_Template *tpnt, int board, int chip, 
     /*  */
 668     int base, int io_port, int irq, int dma, int pci_valid, 
 669     unsigned char pci_bus, unsigned char pci_device_fn, int options) {
 670     struct Scsi_Host *instance;
 671     struct NCR53c7x0_hostdata *hostdata;
 672     char chip_str[80];
 673     int script_len = 0, size = 0;
 674     int ok = 0;
 675 
 676     
 677     options |= PERM_OPTIONS;
 678 
 679     switch (chip) {
 680     case 825:
 681     case 820:
 682     case 815:
 683     case 810:
 684         script_len = NCR53c8xx_script_len;
 685         options |= OPTION_INTFLY;
 686         sprintf (chip_str, "NCR53c%d", chip);
 687         break;
 688     default:
 689         printk("scsi-ncr53c7,8xx : unsupported SCSI chip %d\n", chip);
 690         return -1;
 691     }
 692 
 693     printk("scsi-ncr53c7,8xx : %s at memory 0x%x, io 0x%x, irq %d",
 694         chip_str, base, io_port, irq);
 695     if (dma == DMA_NONE)
 696         printk("\n");
 697     else 
 698         printk(", dma %d\n", dma);
 699 
 700     if ((chip / 100 == 8) && !pci_valid) 
 701         printk ("scsi-ncr53c7,8xx : for better reliability and performance, please use the\n" 
 702                 "        PCI override instead.\n"
 703                 "        Syntax : ncr53c8{10,20,25}=pci,<bus>,<device>,<function>\n"
 704                 "                 <bus> and <device> are usually 0.\n");
 705 
 706     if (options & OPTION_DEBUG_PROBE_ONLY) {
 707         printk ("scsi-ncr53c7,8xx : probe only enabled, aborting initialization\n");
 708         return -1;
 709     }
 710 
 711     size = sizeof(struct NCR53c7x0_hostdata) + script_len;
 712 
 713     instance = scsi_register (tpnt, size);
 714     hostdata = (struct NCR53c7x0_hostdata *) 
 715         instance->hostdata;
 716     hostdata->size = size;
 717     hostdata->script_count = script_len / sizeof(long);
 718     hostdata = (struct NCR53c7x0_hostdata *) instance->hostdata;
 719     hostdata->board = board;
 720     hostdata->chip = chip;
 721     if ((hostdata->pci_valid = pci_valid)) {
 722         hostdata->pci_bus = pci_bus;
 723         hostdata->pci_device_fn = pci_device_fn;
 724     }
 725 
 726     /*
 727      * Being memory mapped is more desirable, since 
 728      *
 729      * - Memory accesses may be faster.
 730      *
 731      * - The destination and source address spaces are the same for 
 732      *   all instructions, meaning we don't have to twiddle dmode or 
 733      *   any other registers.
 734      *
 735      * So, we try for memory mapped, and if we don't get it,
 736      * we go for port mapped, and that failing we tell the user
 737      * it can't work.
 738      */
 739 
 740     if (base) {
 741         instance->base = (unsigned char *) base;
 742         /* Check for forced I/O mapping */
 743         if (!(options & OPTION_IO_MAPPED)) {
 744             options |= OPTION_MEMORY_MAPPED;
 745             ok = 1;
 746         }
 747     } else {
 748         options &= ~OPTION_MEMORY_MAPPED;
 749     }
 750 
 751     if (io_port) {
 752         instance->io_port = io_port;
 753         options |= OPTION_IO_MAPPED;
 754         ok = 1;
 755     } else {
 756         options &= ~OPTION_IO_MAPPED;
 757     }
 758 
 759     if (!ok) {
 760         printk ("scsi%d : not initializing, no I/O or memory mapping known \n",
 761             instance->host_no);
 762         scsi_unregister (instance);
 763         return -1;
 764     }
 765     instance->irq = irq;
 766     instance->dma_channel = dma;
 767 
 768     hostdata->options = options;
 769     
 770     return NCR53c7x0_init(instance);
 771 }
 772 
 773 
 774 /* 
 775  * Function : static int pci_init(Scsi_Host_Template *tpnt, int board, 
 776  *      int chip, int bus, int device_fn, int options)
 777  *
 778  * Purpose : initializes a NCR53c800 family based on the PCI
 779  *      bus, device, and function location of it.  Allows 
 780  *      reprogramming of latency timer and determining addresses
 781  *      and weather bus mastering, etc. are OK.
 782  *      
 783  *      Useful where a new NCR chip is backwards compatible with
 784  *      a supported chip, but the DEVICE ID has changed so it 
 785  *      doesn't show up when the autoprobe does a pcibios_find_device.
 786  *
 787  * Inputs : tpnt - Template for this SCSI adapter, board - board level
 788  *      product, chip - 810, 820, or 825, bus - PCI bus, device_fn -
 789  *      device and function encoding as used by PCI BIOS calls.
 790  * 
 791  * Returns : 0 on success, -1 on failure.
 792  *
 793  */
 794 
 795 static int pci_init (Scsi_Host_Template *tpnt, int board, int chip, 
     /*  */
 796     unsigned char bus, unsigned char device_fn, int options) {
 797     unsigned short vendor_id, device_id, command;
 798     unsigned long base, io_port; 
 799     unsigned char irq, revision;
 800     int error, expected_chip, expected_id, max_revision, min_revision;
 801     int i;
 802 
 803     printk("scsi-ncr53c7,8xx : at PCI bus %d, device %d,  function %d\n",
 804         bus, (int) (device_fn & 0xf8) >> 3, 
 805         (int) device_fn & 7);
 806 
 807     if (!pcibios_present) {
 808         printk("scsi-ncr53c7,8xx : not initializing due to lack of PCI BIOS,\n"
 809                "        try using memory, port, irq override instead.\n");
 810         return -1;
 811     }
 812 
 813     if ((error = pcibios_read_config_word (bus, device_fn, PCI_VENDOR_ID, 
 814         &vendor_id)) ||
 815         (error = pcibios_read_config_word (bus, device_fn, PCI_DEVICE_ID, 
 816             &device_id)) ||
 817         (error = pcibios_read_config_word (bus, device_fn, PCI_COMMAND, 
 818             &command)) ||
 819         (error = pcibios_read_config_dword (bus, device_fn, 
 820             PCI_BASE_ADDRESS_0, &io_port)) || 
 821         (error = pcibios_read_config_dword (bus, device_fn, 
 822             PCI_BASE_ADDRESS_1, &base)) ||
 823         (error = pcibios_read_config_byte (bus, device_fn, PCI_CLASS_REVISION,
 824             &revision)) ||
 825         (error = pcibios_read_config_byte (bus, device_fn, PCI_INTERRUPT_LINE,
 826             &irq))) {
 827         printk ("scsi-ncr53c7,8xx : error %s not initializing due to error reading configuration space\n"
 828                 "        perhaps you specified an incorrect PCI bus, device, or function.\n"
 829                 , pcibios_strerror(error));
 830         return -1;
 831     }
 832 
 833     /* If any one ever clones the NCR chips, this will have to change */
 834 
 835     if (vendor_id != PCI_VENDOR_ID_NCR) {
 836         printk ("scsi-ncr53c7,8xx : not initializing, 0x%04x is not NCR vendor ID\n",
 837             (int) vendor_id);
 838         return -1;
 839     }
 840 
 841 
 842     /* 
 843      * Bit 0 is the address space indicator and must be one for I/O
 844      * space mappings, bit 1 is reserved, discard them after checking
 845      * that they have the correct value of 1.
 846      */
 847 
 848     if (command & PCI_COMMAND_IO) { 
 849         if ((io_port & 3) != 1) {
 850             printk ("scsi-ncr53c7,8xx : disabling I/O mapping since base address 0 (0x%lx)\n"
 851                     "        bits 0..1 indicate a non-IO mapping\n", io_port);
 852             io_port = 0;
 853         } else
 854             io_port &= PCI_BASE_ADDRESS_IO_MASK;
 855     }
 856 
 857     if (command & PCI_COMMAND_MEMORY) {
 858         if ((base & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) {
 859             printk("scsi-ncr53c7,8xx : disabling memory mapping since base address 1\n"
 860                    "        contains a non-memory mapping\n");
 861             base = 0;
 862         } else 
 863             base &= PCI_BASE_ADDRESS_MEM_MASK;
 864     }
 865         
 866     if (!io_port && !base) {
 867         printk ("scsi-ncr53c7,8xx : not initializing, both I/O and memory mappings disabled\n");
 868         return -1;
 869     }
 870         
 871     if (!(command & PCI_COMMAND_MASTER)) {
 872         printk ("scsi-ncr53c7,8xx : not initializing, BUS MASTERING was disabled\n");
 873         return -1;
 874     }
 875 
 876     for (i = 0; i < NPCI_CHIP_IDS; ++i) {
 877         if (device_id == pci_chip_ids[i].pci_device_id) {
 878             max_revision = pci_chip_ids[i].max_revision;
 879             min_revision = pci_chip_ids[i].min_revision;
 880             expected_chip = pci_chip_ids[i].chip;
 881         }
 882         if (chip == pci_chip_ids[i].chip)
 883             expected_id = pci_chip_ids[i].pci_device_id;
 884     }
 885 
 886     if (chip && device_id != expected_id) 
 887         printk ("scsi-ncr53c7,8xx : warning : device id of 0x%04x doesn't\n"
 888                 "                   match expected 0x%04x\n",
 889             (unsigned int) device_id, (unsigned int) expected_id );
 890     
 891     if (max_revision != -1 && revision > max_revision) 
 892         printk ("scsi-ncr53c7,8xx : warning : revision of %d is greater than %d.\n",
 893             (int) revision, max_revision);
 894     else if (min_revision != -1 && revision < min_revision)
 895         printk ("scsi-ncr53c7,8xx : warning : revision of %d is less than %d.\n",
 896             (int) revision, min_revision);
 897 
 898     return normal_init (tpnt, board, chip, (int) base, (int) io_port, 
 899         (int) irq, DMA_NONE, 1, bus, device_fn, options);
 900 }
 901 
 902 
 903 /* 
 904  * Function : int NCR53c7xx_detect(Scsi_Host_Template *tpnt)
 905  *
 906  * Purpose : detects and initializes NCR53c7,8x0 SCSI chips
 907  *      that were autoprobed, overridden on the LILO command line, 
 908  *      or specified at compile time.
 909  *
 910  * Inputs : tpnt - template for this SCSI adapter
 911  * 
 912  * Returns : number of host adapters detected
 913  *
 914  */
 915 
 916 int NCR53c7xx_detect(Scsi_Host_Template *tpnt) {
     /*  */
 917     short current_chip;
 918     int i;
 919     int current_override;
 920     int count;                  /* Number of boards detected */
 921     unsigned char pci_bus, pci_device_fn;
 922     static short pci_index=0;   /* Device index to PCI BIOS calls */
 923     
 924 
 925     for (current_override = count = 0; current_override < OVERRIDE_LIMIT; 
 926          ++current_override) {
 927          if (overrides[current_override].pci ? 
 928             !pci_init (tpnt, overrides[current_override].board,
 929                 overrides[current_override].chip,
 930                 (unsigned char) overrides[current_override].data.pci.bus,
 931                 (((overrides[current_override].data.pci.device
 932                 << 3) & 0xf8)|(overrides[current_override].data.pci.function & 
 933                 7)), overrides[current_override].options):
 934             !normal_init (tpnt, overrides[current_override].board, 
 935                 overrides[current_override].chip, 
 936                 overrides[current_override].data.normal.base, 
 937                 overrides[current_override].data.normal.io_port,
 938                 overrides[current_override].data.normal.irq,
 939                 overrides[current_override].data.normal.dma,
 940                 0 /* PCI data invalid */, 0 /* PCI bus place holder */,  
 941                 0 /* PCI device_function place holder */,
 942                 overrides[current_override].options)) {
 943             ++count;
 944         } 
 945     }
 946 
 947     if (pcibios_present()) {
 948         for (i = 0; i < NPCI_CHIP_IDS; ++i) 
 949             for (pci_index = 0;
 950                 !pcibios_find_device (PCI_VENDOR_ID_NCR, 
 951                     pci_chip_ids[i].pci_device_id, pci_index, &pci_bus, 
 952                     &pci_device_fn) && 
 953                 !pci_init (tpnt, BOARD_GENERIC, pci_chip_ids[i].chip, 
 954                     pci_bus, pci_device_fn, /* no options */ 0); 
 955                 ++count, ++pci_index);
 956     }
 957     return count;
 958 }
 959 
 960 /* NCR53c810 and NCR53c820 script handling code */
 961 
 962 #include "53c8xx_d.h"
 963 static int NCR53c8xx_script_len = sizeof (SCRIPT);
 964 
 965 /* 
 966  * Function : static void NCR53c8x0_init_fixup (struct Scsi_Host *host)
 967  *
 968  * Purpose :  copy and fixup the SCSI SCRIPTS(tm) code for this device.
 969  *
 970  * Inputs : host - pointer to this host adapter's structure
 971  *
 972  */
 973 
 974 static void NCR53c8x0_init_fixup (struct Scsi_Host *host) {
     /*  */
 975     NCR53c7x0_local_declare();
 976     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
 977         host->hostdata;
 978     unsigned char tmp;
 979     int i, ncr_to_memory, memory_to_ncr, ncr_to_ncr;
 980     unsigned long base;
 981     NCR53c7x0_local_setup(host);
 982 
 983 
 984 
 985     /* XXX - NOTE : this code MUST be made endian aware */
 986     /*  Copy code into buffer that was allocated at detection time.  */
 987     memcpy ((void *) hostdata->script, (void *) SCRIPT, 
 988         sizeof(SCRIPT));
 989     /* Fixup labels */
 990     for (i = 0; i < PATCHES; ++i) 
 991         hostdata->script[LABELPATCHES[i]] += 
 992             (unsigned long) hostdata->script;
 993 
 994     /* 
 995      * Fixup absolutes set at boot-time.
 996      * 
 997      * All Absolute variables suffixed with "dsa_" and "int_"
 998      * are constants, and need no fixup provided the assembler has done 
 999      * it for us (I don't know what the "real" NCR assembler does in 
1000      * this case, my assembler does the right magic).
1001      */
1002 
1003     /*
1004      * Just for the hell of it, preserve the settings of 
1005      * Burst Length and Enable Read Line bits from the DMODE 
1006      * register.  Make sure SCRIPTS start automagically.
1007      */
1008 
1009     tmp = NCR53c7x0_read8(DMODE_REG_10);
1010     tmp &= (DMODE_800_ERL | DMODE_BL_MASK);
1011 
1012     if (!(hostdata->options & OPTION_MEMORY_MAPPED)) {
1013         base = (long) host->io_port;
1014         memory_to_ncr = tmp|DMODE_800_DIOM;
1015         ncr_to_memory = tmp|DMODE_800_SIOM;
1016         ncr_to_ncr = tmp|DMODE_800_DIOM|DMODE_800_SIOM;
1017     } else {
1018         base = (long) host->base;
1019         ncr_to_ncr = memory_to_ncr = ncr_to_memory = tmp;
1020     }
1021 
1022     printk ("scsi%d : m_to_n = 0x%x, n_to_m = 0x%x, n_to_n = 0x%x\n",
1023             (int) host->host_no, (int) memory_to_ncr, (int) 
1024             ncr_to_memory, ncr_to_ncr);
1025 
1026     patch_abs_32 (hostdata->script, 0, addr_scratch, base + SCRATCHA_REG_800);
1027     patch_abs_32 (hostdata->script, 0, addr_sfbr, base + SFBR_REG);
1028     patch_abs_32 (hostdata->script, 0, addr_temp, base + TEMP_REG);
1029 
1030     /*
1031      * I needed some variables in the script to be accessible to 
1032      * both the NCR chip and the host processor. For these variables,
1033      * I made the arbitrary decision to store them directly in the 
1034      * hostdata structure rather than in the RELATIVE area of the 
1035      * SCRIPTS.
1036      */
1037     
1038 
1039     patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_memory, tmp);
1040     patch_abs_rwri_data (hostdata->script, 0, dmode_memory_to_ncr, memory_to_ncr);
1041     patch_abs_rwri_data (hostdata->script, 0, dmode_ncr_to_memory, ncr_to_memory);
1042     patch_abs_rwri_data (hostdata->script, 0, dmode_ncr_to_ncr, ncr_to_ncr);
1043 
1044     patch_abs_32 (hostdata->script, 0, issue_dsa_head, (long) &(hostdata->issue_dsa_head));
1045     patch_abs_32 (hostdata->script, 0, msg_buf, (long) &(hostdata->msg_buf));
1046     patch_abs_32 (hostdata->script, 0, reconnect_dsa_head, (long) &(hostdata->reconnect_dsa_head));
1047     patch_abs_32 (hostdata->script, 0, reselected_identify, (long) &(hostdata->reselected_identify));
1048     patch_abs_32 (hostdata->script, 0, reselected_tag, (long) &(hostdata->reselected_tag));
1049 
1050     patch_abs_32 (hostdata->script, 0, test_dest, (long) &(hostdata->test_dest));
1051     patch_abs_32 (hostdata->script, 0, test_src, (long) &(hostdata->test_source));
1052 
1053 
1054     /*
1055      * Make sure the NCR and Linux code agree on the location of 
1056      * certain fields.
1057      */
1058 
1059 /* 
1060  * XXX - for cleanness, E_* fields should be type unsigned long *
1061  * and should reflect the _relocated_ addresses.  Change this.
1062  */
1063     hostdata->E_accept_message = Ent_accept_message;
1064     hostdata->E_command_complete = Ent_command_complete;                
1065     hostdata->E_debug_break = Ent_debug_break;  
1066     hostdata->E_dsa_code_template = Ent_dsa_code_template;
1067     hostdata->E_dsa_code_template_end = Ent_dsa_code_template_end;
1068     hostdata->E_initiator_abort = Ent_initiator_abort;
1069     hostdata->E_msg_in = Ent_msg_in;
1070     hostdata->E_other_transfer = Ent_other_transfer;
1071     hostdata->E_reject_message = Ent_reject_message;
1072     hostdata->E_respond_message = Ent_respond_message;
1073     hostdata->E_schedule = Ent_schedule;                        
1074     hostdata->E_select = Ent_select;
1075     hostdata->E_select_msgout = Ent_select_msgout;
1076     hostdata->E_target_abort = Ent_target_abort;
1077 #ifdef Ent_test_0
1078     hostdata->E_test_0 = Ent_test_0;
1079 #endif
1080     hostdata->E_test_1 = Ent_test_1;
1081     hostdata->E_test_2 = Ent_test_2;
1082 #ifdef Ent_test_3
1083     hostdata->E_test_3 = Ent_test_3;
1084 #endif
1085 
1086     hostdata->dsa_cmdout = A_dsa_cmdout;
1087     hostdata->dsa_cmnd = A_dsa_cmnd;
1088     hostdata->dsa_datain = A_dsa_datain;
1089     hostdata->dsa_dataout = A_dsa_dataout;
1090     hostdata->dsa_end = A_dsa_end;                      
1091     hostdata->dsa_msgin = A_dsa_msgin;
1092     hostdata->dsa_msgout = A_dsa_msgout;
1093     hostdata->dsa_msgout_other = A_dsa_msgout_other;
1094     hostdata->dsa_next = A_dsa_next;
1095     hostdata->dsa_select = A_dsa_select;
1096     hostdata->dsa_start = Ent_dsa_code_template - Ent_dsa_zero;
1097     hostdata->dsa_status = A_dsa_status;
1098 
1099     /* sanity check */
1100     if (A_dsa_fields_start != Ent_dsa_code_template_end - 
1101         Ent_dsa_zero) 
1102         printk("scsi%d : NCR dsa_fields start is %d not %d\n",
1103             host->host_no, A_dsa_fields_start, Ent_dsa_code_template_end - 
1104             Ent_dsa_zero);
1105 
1106     printk("scsi%d : NCR code relocated to 0x%lx\n", host->host_no,
1107         (unsigned long) hostdata->script);
1108 }
1109 
1110 /*
1111  * Function : static int NCR53c8xx_run_tests (struct Scsi_Host *host)
1112  *
1113  * Purpose : run various verification tests on the NCR chip, 
1114  *      including interrupt generation, and proper bus mastering
1115  *      operation.
1116  * 
1117  * Inputs : host - a properly initialized Scsi_Host structure
1118  *
1119  * Preconditions : the NCR chip must be in a halted state.
1120  *
1121  * Returns : 0 if all tests were successful, -1 on error.
1122  * 
1123  */
1124 
1125 static int NCR53c8xx_run_tests (struct Scsi_Host *host) {
     /*  */
1126     NCR53c7x0_local_declare();
1127     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1128         host->hostdata;
1129     unsigned long timeout, start;
1130     int old_level, failed, i;
1131     NCR53c7x0_local_setup(host);
1132 
1133     printk("scsi%d : testing\n", host->host_no);
1134 
1135     /* The NCR chip _must_ be idle to run the test scripts */
1136 
1137     old_level = splx(0);
1138     if (!hostdata->idle) {
1139         printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
1140         splx(old_level);
1141         return -1;
1142     }
1143 
1144     /* 
1145      * Check for functional interrupts, this could work as an
1146      * autoprobe routine.
1147      */
1148 
1149     if (hostdata->issue_dsa_head) {
1150         printk ("scsi%d : hostdata->issue_dsa_head corrupt before test 1\n",
1151             host->host_no);
1152         hostdata->issue_dsa_head = NULL;
1153     }
1154         
1155     if (hostdata->options & OPTION_DEBUG_TEST1) {
1156         hostdata->idle = 0;
1157         hostdata->test_running = 1;
1158         hostdata->test_completed = -1;
1159         hostdata->test_dest = 0;
1160         hostdata->test_source = 0xdeadbeef;
1161         start = ((unsigned long) hostdata->script) + hostdata->E_test_1;
1162         hostdata->state = STATE_RUNNING;
1163         printk ("scsi%d : test 1", host->host_no);
1164         NCR53c7x0_write32 (DSP_REG, start);
1165         printk (" started\n");
1166         splx(7);
1167 
1168         timeout = jiffies + 50; /* arbitrary */
1169         while ((hostdata->test_completed == -1) && jiffies < timeout);
1170 
1171         failed = 1;
1172         if (hostdata->test_completed == -1)
1173             printk ("scsi%d : driver test 1 timed out%s\n",host->host_no ,
1174                 (hostdata->test_dest == 0xdeadbeef) ? 
1175                     " due to lost interrupt.\n"
1176                     "         Please verify that the correct IRQ is being used for your board,\n"
1177                     "         and that the motherboard IRQ jumpering matches the PCI setup on\n"
1178                     "         PCI systems.\n"
1179                     "         If you are using a NCR53c810 board in a PCI system, you should\n" 
1180                     "         also verify that the board is jumpered to use PCI INTA, since\n"
1181                     "         most PCI motherboards lack support for INTB, INTC, and INTD.\n"
1182                     : "");
1183         else if (hostdata->test_completed != 1) 
1184             printk ("scsi%d : test 1 bad interrupt value (%ld)\n", host->host_no,
1185                 hostdata->test_completed);
1186         else 
1187             failed = (hostdata->test_dest != 0xdeadbeef);
1188 
1189         if (hostdata->test_dest != 0xdeadbeef) {
1190             printk ("scsi%d : driver test 1 read 0x%x instead of 0xdeadbeef indicating a\n"
1191                     "         probable cache invalidation problem.  Please configure caching\n"
1192                     "         as write-through or disabled\n",
1193                 host->host_no, hostdata->test_dest);
1194         }
1195 
1196         if (failed) {
1197             printk ("scsi%d : DSP = 0x%lx (script at 0x%lx, start at 0x%lx)\n",
1198                 host->host_no, (unsigned long) NCR53c7x0_read32(DSP_REG),
1199                 (unsigned long) hostdata->script, start);
1200             printk ("scsi%d : DSPS = 0x%lx\n", host->host_no,
1201                 (unsigned long) NCR53c7x0_read32(DSPS_REG));
1202             splx(old_level);
1203             return -1;
1204         }
1205         hostdata->test_running = 0;
1206     }
1207 
1208     if (hostdata->issue_dsa_head) {
1209         printk ("scsi%d : hostdata->issue_dsa_head corrupt after test 1\n",
1210             host->host_no);
1211         hostdata->issue_dsa_head = NULL;
1212     }
1213 
1214     if (hostdata->options & OPTION_DEBUG_TEST2) {
1215         unsigned long dsa[48];
1216         unsigned char identify = IDENTIFY(0, 0);
1217         unsigned char cmd[6];
1218         unsigned char data[36];
1219         unsigned char status = 0xff;
1220         unsigned char msg = 0xff;
1221 
1222         cmd[0] = INQUIRY;
1223         cmd[1] = cmd[2] = cmd[3] = cmd[5] = 0;
1224         cmd[4] = sizeof(data); 
1225 
1226         dsa[2] = 1;
1227         dsa[3] = (unsigned long) &identify;
1228         dsa[4] = 6;
1229         dsa[5] = (unsigned long) &cmd;
1230         dsa[6] = sizeof(data);
1231         dsa[7] = (unsigned long) &data;
1232         dsa[8] = 1;
1233         dsa[9] = (unsigned long) &status;
1234         dsa[10] = 1;
1235         dsa[11] = (unsigned long) &msg;
1236 
1237         for (i = 0; i < 3; ++i) {
1238             splx(0);
1239             if (!hostdata->idle) {
1240                 printk ("scsi%d : chip not idle, aborting tests\n", host->host_no);
1241                 splx(old_level);
1242                 return -1;
1243             }
1244 
1245             /*       SCNTL3         SDID        */
1246             dsa[0] = (0x33 << 24) | (i << 16)  ;
1247             hostdata->idle = 0;
1248             hostdata->test_running = 2;
1249             hostdata->test_completed = -1;
1250             start = ((unsigned long) hostdata->script) + hostdata->E_test_2;
1251             hostdata->state = STATE_RUNNING;
1252             NCR53c7x0_write32 (DSA_REG, (unsigned long) dsa);
1253             NCR53c7x0_write32 (DSP_REG, start);
1254             splx(7);
1255 
1256             timeout = jiffies + 500;    /* arbitrary */
1257             while ((hostdata->test_completed == -1) && jiffies < timeout);
1258             NCR53c7x0_write32 (DSA_REG, 0);
1259 
1260             if (hostdata->test_completed == 2) {
1261                 data[35] = 0;
1262                 printk ("scsi%d : test 2 INQUIRY to target %d, lun 0 : %s\n",
1263                     host->host_no, i, data + 8);
1264                 printk ("scsi%d : status ", host->host_no);
1265                 print_status (status);
1266                 printk ("\nscsi%d : message ", host->host_no);
1267                 print_msg (&msg);
1268                 printk ("\n");
1269             } else if (hostdata->test_completed == 3) {
1270                 printk("scsi%d : test 2 no connection with target %d\n",
1271                     host->host_no, i);
1272                 if (!hostdata->idle) {
1273                     printk("scsi%d : not idle\n", host->host_no);
1274                     splx(old_level);
1275                     return -1;
1276                 }
1277             } else if (hostdata->test_completed == -1) {
1278                 printk ("scsi%d : test 2 timed out\n", host->host_no);
1279                 splx(old_level);
1280                 return -1;
1281             } 
1282             hostdata->test_running = 0;
1283             if (hostdata->issue_dsa_head) {
1284                 printk ("scsi%d : hostdata->issue_dsa_head corrupt after test 2 id %d\n",
1285                     host->host_no, i);
1286                 hostdata->issue_dsa_head = NULL;
1287         }
1288         }
1289     }
1290     printk ("scsi%d : tests complete.\n", host->host_no);
1291 
1292     splx(old_level);
1293     return 0;
1294 }
1295 
1296 /*
1297  * Function : static void NCR53c8xx_dsa_fixup (struct NCR53c7x0_cmd *cmd)
1298  *
1299  * Purpose : copy the NCR53c8xx dsa structure into cmd's dsa buffer,
1300  *      performing all necessary relocation.
1301  *
1302  * Inputs : cmd, a NCR53c7x0_cmd structure with a dsa area large
1303  *      enough to hold the NCR53c8xx dsa.
1304  */
1305 
1306 static void NCR53c8xx_dsa_fixup (struct NCR53c7x0_cmd *cmd) {
     /*  */
1307     Scsi_Cmnd *c = cmd->cmd;
1308     struct Scsi_Host *host = c->host;
1309     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1310         host->hostdata;
1311     int i;
1312 
1313     memcpy (cmd->dsa, hostdata->script + (hostdata->E_dsa_code_template / 4),
1314         hostdata->E_dsa_code_template_end - hostdata->E_dsa_code_template);
1315 
1316     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(long), 
1317         dsa_temp_jump_resume, ((unsigned long) cmd->dsa) + 
1318         Ent_dsa_jump_resume - Ent_dsa_zero);
1319     patch_abs_rwri_data (cmd->dsa, Ent_dsa_code_template / sizeof(long),
1320         dsa_temp_lun, c->lun);
1321     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(long),
1322         dsa_temp_dsa_next, ((unsigned long) cmd->dsa) + A_dsa_next);
1323     patch_abs_32 (cmd->dsa, Ent_dsa_code_template / sizeof(long), 
1324         dsa_temp_sync, hostdata->sync[c->target].select_indirect);
1325     patch_abs_rwri_data (cmd->dsa, Ent_dsa_code_template / sizeof(long),
1326         dsa_temp_target, c->target);
1327 }
1328 
1329 /*
1330  * Function : static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int
1331  *      result)
1332  *
1333  * Purpose : mark SCSI command as finished, OR'ing the host portion 
1334  *      of the result word into the result field of the corresponding
1335  *      Scsi_Cmnd structure, and removing it from the internal queues.
1336  *
1337  * Inputs : cmd - command, result - entire result field
1338  *
1339  * Preconditions : the  NCR chip should be in a halted state when 
1340  *      abnormal_finished is run, since it modifies structures which
1341  *      the NCR expects to have exclusive access to.
1342  */
1343 
1344 static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int result) {
     /*  */
1345     Scsi_Cmnd *c = cmd->cmd;
1346     struct Scsi_Host *host = c->host;
1347     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1348         host->hostdata;
1349     int old_level;
1350     char **prev, *search;
1351     int i;
1352 
1353     old_level = splx(0);
1354     for (i = 0; i < 2; ++i) {
1355         for (search = (char *) (i ? hostdata->issue_dsa_head : 
1356                 hostdata->reconnect_dsa_head), prev = (char **) (i ? 
1357                 &(hostdata->issue_dsa_head) : &(hostdata->reconnect_dsa_head));
1358              search && (search + hostdata->dsa_start) != (char *) cmd->dsa;
1359              prev = (char **) (search + hostdata->dsa_next), 
1360                 search = *prev);
1361 
1362         if (search)
1363             *prev = *(char **) (search + hostdata->dsa_next);
1364     }
1365 
1366     if (cmd->prev)
1367         cmd->prev->next = cmd->next;
1368 
1369     if (cmd->next)
1370         cmd->next->prev = cmd->prev;
1371 
1372     if (hostdata->running_list == cmd)
1373         hostdata->running_list = cmd->next;
1374 
1375     if (!scan_scsis_buf_busy) {
1376 #ifdef SCSI_MALLOC
1377         scsi_free ((void *) cmd->real, cmd->size);
1378 #else
1379         kfree_s (cmd->real, cmd->size);
1380 #endif
1381     } else {
1382         scan_scsis_buf_busy = 0;
1383     }
1384 
1385     c->host_scribble = NULL;
1386     c->result = result;
1387     c->scsi_done(c);
1388 
1389     splx(old_level);
1390 }
1391 
1392 /* 
1393  * Function : static void intr_break (struct Scsi_Host *host,
1394  *      struct NCR53c7x0_cmd *cmd)
1395  *
1396  * Purpose :  Handler for breakpoint interrupts from a SCSI script
1397  *
1398  * Inputs : host - pointer to this host adapter's structure,
1399  *      cmd - pointer to the command (if any) dsa was pointing 
1400  *      to.
1401  *
1402  */
1403 
1404 static void intr_break (struct Scsi_Host *host, struct 
     /*  */
1405     NCR53c7x0_cmd *cmd) {
1406     NCR53c7x0_local_declare();
1407     struct NCR53c7x0_break *bp;
1408 #if 0
1409     Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
1410 #endif
1411     unsigned long *dsp;
1412     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1413         host->hostdata;         
1414     int old_level;
1415     NCR53c7x0_local_setup(host);
1416 
1417     /*
1418      * Find the break point corresponding to this address, and 
1419      * dump the appropriate debugging information to standard 
1420      * output.  
1421      */
1422 
1423     old_level = splx(0);
1424     dsp = (unsigned long *) NCR53c7x0_read32(DSP_REG);
1425     for (bp = hostdata->breakpoints; bp && bp->address != dsp; 
1426         bp = bp->next);
1427     if (!bp) 
1428         panic("scsi%d : break point interrupt from %p with no breakpoint!",
1429             host->host_no, dsp);
1430 
1431     /*
1432      * Configure the NCR chip for manual start mode, so that we can 
1433      * point the DSP register at the instruction that follows the 
1434      * INT int_debug_break instruction.
1435      */
1436 
1437     NCR53c7x0_write8 (hostdata->dmode, 
1438         NCR53c7x0_read8(hostdata->dmode)|DMODE_MAN);
1439 
1440     /*
1441      * And update the DSP register, using the size of the old 
1442      * instruction in bytes.
1443      */
1444 
1445     splx(old_level);
1446 }
1447 
1448 /*
1449  * Function : static int asynchronous (struct Scsi_Host *host, int target)
1450  *
1451  * Purpose : reprogram between the selected SCSI Host adapter and target 
1452  *      (assumed to be currently connected) for asynchronous transfers.
1453  *
1454  * Inputs : host - SCSI host structure, target - numeric target ID.
1455  *
1456  * Preconditions : the NCR chip should be in one of the halted states
1457  */
1458     
1459 static int asynchronous (struct Scsi_Host *host, int target) {
     /*  */
1460     NCR53c7x0_local_declare();
1461     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1462         host->hostdata;
1463     NCR53c7x0_local_setup(host);
1464 
1465     if ((hostdata->chip / 100) == 8) {
1466         hostdata->sync[target].select_indirect = (hostdata->saved_scntl3 << 24)
1467             | (target << 16);
1468 /* Fill in script here */
1469     } else if ((hostdata->chip != 700) && (hostdata->chip != 70066)) {
1470         hostdata->sync[target].select_indirect = (1 << (target & 7)) << 16;
1471     }
1472 
1473 /* 
1474  * Halted implies connected, when resetting we shouldn't change the 
1475  * current parameters but must reset all targets to asynchronous.
1476  */
1477 
1478     if (hostdata->state == STATE_HALTED) {
1479         if ((hostdata->chip / 100) == 8) {
1480             NCR53c7x0_write8 (SCNTL3_REG_800, hostdata->saved_scntl3);
1481         }
1482     /* Offset = 0, transfer period = divide SCLK by 4 */
1483         NCR53c7x0_write8 (SXFER_REG, 0);
1484     }
1485     return 0;
1486 }
1487 
1488 /* 
1489  * XXX - do we want to go out of our way (ie, add extra code to selection
1490  *      in the NCR53c710/NCR53c720 script) to reprogram the synchronous
1491  *      conversion bits, or can we be content in just setting the 
1492  *      sxfer bits?
1493  */
1494 
1495 /* Table for NCR53c8xx synchronous values */
1496 static const struct {
1497     int div;
1498     unsigned char scf;
1499     unsigned char tp;
1500 } syncs[] = {
1501 /*      div     scf     tp      div     scf     tp      div     scf     tp */
1502     {   40,     1,      0}, {   50,     1,      1}, {   60,     1,      2}, 
1503     {   70,     1,      3}, {   75,     2,      1}, {   80,     1,      4},
1504     {   90,     1,      5}, {   100,    1,      6}, {   105,    2,      3},
1505     {   110,    1,      7}, {   120,    2,      4}, {   135,    2,      5},
1506     {   140,    3,      3}, {   150,    2,      6}, {   160,    3,      4},
1507     {   165,    2,      7}, {   180,    3,      5}, {   200,    3,      6},
1508     {   210,    4,      3}, {   220,    3,      7}, {   240,    4,      4},
1509     {   270,    4,      5}, {   300,    4,      6}, {   330,    4,      7}
1510 };
1511 
1512 /*
1513  * Function : static void synchronous (struct Scsi_Host *host, int target, 
1514  *      char *msg)
1515  *
1516  * Purpose : reprogram transfers between the selected SCSI initiator and 
1517  *      target for synchronous SCSI transfers such that the synchronous 
1518  *      offset is less than that requested and period at least as long 
1519  *      as that requested.  Also modify *msg such that it contains 
1520  *      an appropriate response. 
1521  *
1522  * Inputs : host - NCR53c7,8xx SCSI host, target - number SCSI target id,
1523  *      msg - synchronous transfer request.
1524  */
1525 
1526 
1527 static void synchronous (struct Scsi_Host *host, int target, char *msg) {
     /*  */
1528     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1529         host->hostdata;
1530     int desire, divisor, i, limit;
1531     unsigned long *script;
1532     unsigned char scntl3, sxfer;
1533    
1534 /* Scale divisor by 10 to accommodate fractions */ 
1535     desire = 1000000000L / (msg[3] * 4);
1536     divisor = desire / (hostdata->scsi_clock / 10);
1537 
1538     if (msg[4] > 8)
1539         msg[4] = 8;
1540 
1541     printk("scsi%d : optimal synchronous divisor of %d.%01d\n", host->host_no,
1542         divisor / 10, divisor % 10);
1543 
1544     limit = (sizeof(syncs) / sizeof(syncs[0])) - 1;
1545     for (i = 0; (i < limit) && (divisor < syncs[i + 1].div); ++i);
1546 
1547     printk("scsi%d : selected synchronous divisor of %d.%01d\n", host->host_no,
1548         syncs[i].div / 10, syncs[i].div % 10);
1549 
1550     msg[3] = (1000000000 / divisor / 10 / 4);
1551 
1552     scntl3 = (hostdata->chip / 100 == 8) ? ((hostdata->saved_scntl3 & 
1553         ~SCNTL3_800_SCF_MASK) | (syncs[i].scf << SCNTL3_800_SCF_SHIFT)) : 0;
1554     sxfer = (msg[4] << SXFER_MO_SHIFT) | ((syncs[i].tp) << SXFER_TP_SHIFT);
1555 
1556     if ((hostdata->chip != 700) && (hostdata->chip != 70066)) {
1557         hostdata->sync[target].select_indirect = (scntl3 << 24) | (target << 16) | 
1558                 (sxfer << 8);
1559 
1560         script = hostdata->sync[target].script;
1561 
1562         /* XXX - add NCR53c7x0 code to reprogram SCF bits if we want to */
1563         if ((hostdata->chip / 100) == 8) {
1564             script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
1565                 DCMD_RWRI_OP_MOVE) << 24) |
1566                 (SCNTL3_REG_800 << 16) | (scntl3 << 8);
1567             script[1] = 0;
1568             script += 2;
1569         }
1570 
1571         script[0] = ((DCMD_TYPE_RWRI | DCMD_RWRI_OPC_MODIFY |
1572             DCMD_RWRI_OP_MOVE) << 24) |
1573                 (SXFER_REG << 16) | (sxfer << 8);
1574         script[1] = 0;
1575         script += 2;
1576 
1577         script[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_RETURN) << 24) | DBC_TCI_TRUE;
1578         script[1] = 0;
1579         script += 2;
1580     }
1581 }
1582 
1583 /* 
1584  * Function : static int NCR53c8x0_dstat_sir_intr (struct Scsi_Host *host,
1585  *      struct NCR53c7x0_cmd *cmd)
1586  *
1587  * Purpose :  Handler for INT generated instructions for the 
1588  *      NCR53c810/820 SCSI SCRIPT
1589  *
1590  * Inputs : host - pointer to this host adapter's structure,
1591  *      cmd - pointer to the command (if any) dsa was pointing 
1592  *      to.
1593  *
1594  */
1595 
1596 static int NCR53c8x0_dstat_sir_intr (struct Scsi_Host *host, struct 
     /*  */
1597     NCR53c7x0_cmd *cmd) {
1598     NCR53c7x0_local_declare();
1599     Scsi_Cmnd *c = cmd ? cmd->cmd : NULL;
1600     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1601         host->hostdata;         
1602     unsigned long dsps,*dsp;    /* Argument of the INT instruction */
1603     NCR53c7x0_local_setup(host);
1604     dsps = NCR53c7x0_read32(DSPS_REG);
1605     dsp = (unsigned long *) NCR53c7x0_read32(DSP_REG);
1606 
1607     if (hostdata->options & OPTION_DEBUG_INTR) 
1608         printk ("scsi%d : DSPS = 0x%lx\n", host->host_no, dsps);
1609 
1610     switch (dsps) {
1611     case A_int_msg_1:
1612         printk ("scsi%d : message", host->host_no);
1613         if (cmd) 
1614             printk (" from target %d lun %d", c->target, c->lun);
1615         print_msg (hostdata->msg_buf);
1616         printk("\n");
1617         switch (hostdata->msg_buf[0]) {
1618         /* 
1619          * Unless we've initiated synchronous negotiation, I don't
1620          * think that this should happen.
1621          */
1622         case MESSAGE_REJECT:
1623             hostdata->dsp = hostdata->script + hostdata->E_accept_message /
1624                 sizeof(long);
1625             hostdata->dsp_changed = 1;
1626             break;
1627         case INITIATE_RECOVERY:
1628             printk ("scsi%d : extended contingent allegiance not supported yet, rejecting\n",
1629                 host->host_no);
1630             hostdata->dsp = hostdata->script + hostdata->E_reject_message /
1631                 sizeof(long);
1632             hostdata->dsp_changed = 1;
1633         }
1634         return SPECIFIC_INT_NOTHING;
1635     case A_int_msg_sdtr:
1636         if (cmd) {
1637             printk ("scsi%d : target %d %s synchronous transfer period %dns, offset%d\n",
1638                 host->host_no, c->target, (cmd->flags & CMD_FLAG_SDTR) ? "accepting" :
1639                 "requesting", hostdata->msg_buf[3] * 4, hostdata->msg_buf[4]);
1640         /* 
1641          * Initiator initiated, won't happen unless synchronous 
1642          *      transfers are enabled.  If we get a SDTR message in
1643          *      response to our SDTR, we should program our parameters
1644          *      such that 
1645          *              offset <= requested offset
1646          *              period >= requested period                      
1647          */
1648             if (cmd->flags & CMD_FLAG_SDTR) {
1649                 cmd->flags &= ~CMD_FLAG_SDTR; 
1650                 synchronous (host, c->target, hostdata->msg_buf);
1651                 hostdata->dsp = hostdata->script + hostdata->E_accept_message /
1652                     sizeof(long);
1653                 hostdata->dsp_changed = 1;
1654                 return SPECIFIC_INT_NOTHING;
1655             } else {
1656                 if (hostdata->options & OPTION_SYNCHRONOUS)  {
1657                     cmd->flags |= CMD_FLAG_DID_SDTR;
1658                     synchronous (host, c->target, hostdata->msg_buf);
1659                 } else {
1660                     hostdata->msg_buf[4] = 0;           /* 0 offset = async */
1661                 }
1662 
1663                 patch_dsa_32 (cmd->dsa, dsa_msgout_other, 0, 5);
1664                 patch_dsa_32 (cmd->dsa, dsa_msgout_other, 1, 
1665                     hostdata->msg_buf);
1666                 hostdata->dsp = hostdata->script + 
1667                 hostdata->E_respond_message / sizeof(long);
1668                 hostdata->dsp_changed = 1;
1669             }
1670 
1671             if (hostdata->msg_buf[4]) {
1672                 int Hz = 1000000000 / (hostdata->msg_buf[3] * 4);
1673                 printk ("scsi%d : setting target %d to %d.%02dMhz %s SCSI%s\n"
1674                         "         period = %dns, max offset = %d\n",
1675                         host->host_no, c->target, Hz / 1000000, Hz % 1000000,
1676                         ((hostdata->msg_buf[3] < 200) ? "FAST " : 
1677                         "synchronous") ,
1678                         ((hostdata->msg_buf[3] < 200) ? "-II" : ""),
1679                         (int) hostdata->msg_buf[3] * 4, (int) 
1680                         hostdata->msg_buf[4]);
1681             } else {
1682                 printk ("scsi%d : setting target %d to asynchronous SCSI\n",
1683                     host->host_no, c->target);
1684             }
1685             return SPECIFIC_INT_NOTHING;
1686         }
1687         /* Fall through to abort */
1688     case A_int_msg_wdtr:
1689         hostdata->dsp = hostdata->script + hostdata->E_reject_message /
1690             sizeof(long);
1691         hostdata->dsp_changed = 1;
1692         return SPECIFIC_INT_NOTHING;
1693     case A_int_err_unexpected_phase:
1694         if (hostdata->options & OPTION_DEBUG_INTR) 
1695             printk ("scsi%d : unexpected phase\n", host->host_no);
1696         return SPECIFIC_INT_ABORT;
1697     case A_int_err_selected:
1698         printk ("scsi%d : selected by target %d\n", host->host_no,
1699             (int) NCR53c7x0_read8(SSID_REG_800) &7);
1700         hostdata->dsp = hostdata->script + hostdata->E_target_abort / 
1701             sizeof(long);
1702         hostdata->dsp_changed = 1;
1703         return SPECIFIC_INT_NOTHING;
1704     case A_int_err_unexpected_reselect:
1705         printk ("scsi%d : unexpected reselect by target %d\n", host->host_no,
1706             (int) NCR53c7x0_read8(SSID_REG_800));
1707         hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
1708             sizeof(long);
1709         hostdata->dsp_changed = 1;
1710         return SPECIFIC_INT_NOTHING;
1711 /*
1712  * Since contingent allegiance conditions are cleared by the next 
1713  * command issued to a target, we must issue a REQUEST SENSE 
1714  * command after receiving a CHECK CONDITION status, before
1715  * another command is issued.
1716  * 
1717  * Since this NCR53c7x0_cmd will be freed after use, we don't 
1718  * care if we step on the various fields, so modify a few things.
1719  */
1720     case A_int_err_check_condition: 
1721 #if 0
1722         if (hostdata->options & OPTION_DEBUG_INTR) 
1723 #endif
1724             printk ("scsi%d : CHECK CONDITION\n", host->host_no);
1725         if (!c) {
1726             printk("scsi%d : CHECK CONDITION with no SCSI command\n",
1727                 host->host_no);
1728             return SPECIFIC_INT_PANIC;
1729         }
1730 
1731 /*
1732  * When a contingent allegiance condition is created, the target 
1733  * reverts to asynchronous transfers.
1734  */
1735 
1736         asynchronous (host, c->target);
1737 
1738         /* 
1739          * Use normal one-byte selection message, with no attempts to 
1740          * reestablish synchronous or wide messages since this may
1741          * be the crux of our problem.
1742          *
1743          * XXX - once SCSI-II tagged queuing is implemented, we'll
1744          *      have to set this up so that the rest of the DSA
1745          *      agrees with this being an untagged queue'd command.
1746          */
1747 
1748         patch_dsa_32 (cmd->dsa, dsa_msgout, 0, 1);
1749 
1750         /* 
1751          * Modify the table indirect for COMMAND OUT phase, since 
1752          * Request Sense is a six byte command.
1753          */
1754 
1755         patch_dsa_32 (cmd->dsa, dsa_cmdout, 0, 6);
1756 
1757         c->cmnd[0] = REQUEST_SENSE;
1758         c->cmnd[1] &= 0xe0;     /* Zero all but LUN */
1759         c->cmnd[2] = 0;
1760         c->cmnd[3] = 0;
1761         c->cmnd[4] = sizeof(c->sense_buffer);
1762         c->cmnd[5] = 0; 
1763 
1764         /*
1765          * Disable dataout phase, and program datain to transfer to the 
1766          * sense buffer, and add a jump to other_transfer after the 
1767          * command so overflow/underrun conditions are detected.
1768          */
1769 
1770         patch_dsa_32 (cmd->dsa, dsa_dataout, 0, hostdata->E_other_transfer);
1771         patch_dsa_32 (cmd->dsa, dsa_datain, 0, cmd->data_transfer_start);
1772         cmd->data_transfer_start[0] = (((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I | 
1773             DCMD_BMI_IO)) << 24) | sizeof(c->sense_buffer);
1774         cmd->data_transfer_start[1] = (unsigned long) c->sense_buffer;
1775 
1776         cmd->data_transfer_start[2] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) 
1777             << 24) | DBC_TCI_TRUE;
1778         cmd->data_transfer_start[3] = hostdata->E_other_transfer;
1779 
1780         /*
1781          * Currently, this command is flagged as completed, ie 
1782          * it has valid status and message data.  Reflag it as
1783          * incomplete.  Q - need to do something so that original
1784          * status, etc are used.
1785          */
1786 
1787         cmd->cmd->result = 0xffff;              
1788 
1789         /* 
1790          * Restart command as a REQUEST SENSE.
1791          */
1792         hostdata->dsp = hostdata->script + hostdata->E_select /
1793             sizeof(long);
1794         hostdata->dsp_changed = 1;
1795         return SPECIFIC_INT_NOTHING;
1796     case A_int_debug_break:
1797         return SPECIFIC_INT_BREAK;
1798     case A_int_norm_aborted:
1799         hostdata->dsp = hostdata->script + hostdata->E_schedule / 
1800                 sizeof(long);
1801         hostdata->dsp_changed = 1;
1802         if (cmd)
1803             abnormal_finished (cmd, DID_ERROR << 16);
1804         return SPECIFIC_INT_NOTHING;
1805     case A_int_test_1:
1806     case A_int_test_2:
1807         hostdata->idle = 1;
1808         hostdata->test_completed = (dsps - A_int_test_1) / 0x00010000 + 1;
1809         if (hostdata->options & OPTION_DEBUG_INTR)
1810             printk("scsi%d : test%ld complete\n", host->host_no,
1811                 hostdata->test_completed);
1812         return SPECIFIC_INT_NOTHING;
1813 #ifdef A_int_debug_scheduled
1814     case A_int_debug_scheduled:
1815         if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
1816             printk("scsi%d : new I/O 0x%lx scheduled\n", host->host_no,
1817                 NCR53c7x0_read32(DSA_REG));
1818         }
1819         return SPECIFIC_INT_RESTART;
1820 #endif
1821 #ifdef A_int_debug_idle
1822     case A_int_debug_idle:
1823         if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
1824             printk("scsi%d : idle\n", host->host_no);
1825         }
1826         return SPECIFIC_INT_RESTART;
1827 #endif
1828 #ifdef A_int_debug_cmd
1829     case A_int_debug_cmd:
1830         if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
1831             printk("scsi%d : command sent\n");
1832         }
1833     return SPECIFIC_INT_RESTART;
1834 #endif
1835 #ifdef A_int_debug_dsa_loaded
1836     case A_int_debug_dsa_loaded:
1837         if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
1838             printk("scsi%d : DSA loaded with 0x%lx\n", host->host_no,
1839                 NCR53c7x0_read32(DSA_REG));
1840         }
1841         return SPECIFIC_INT_RESTART; 
1842 #endif
1843 #ifdef A_int_debug_reselected
1844     case A_int_debug_reselected:
1845         if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
1846             printk("scsi%d : reselected by target %d lun %d\n",
1847                 host->host_no, (int) NCR53c7x0_read8(SSID_REG_800), 
1848                 (int) hostdata->reselected_identify & 7);
1849         }
1850     return SPECIFIC_INT_RESTART;
1851 #endif
1852 #ifdef A_int_debug_head
1853     case A_int_debug_head:
1854         if (hostdata->options & (OPTION_DEBUG_SCRIPT|OPTION_DEBUG_INTR)) {
1855             printk("scsi%d : issue_dsa_head now 0x%lx\n",
1856                 host->host_no, (unsigned long) hostdata->issue_dsa_head);
1857         }
1858     return SPECIFIC_INT_RESTART;
1859 #endif
1860     default:
1861         if ((dsps & 0xff000000) == 0x03000000) {
1862              printk ("scsi%d : misc debug interrupt 0x%lx\n",
1863                 host->host_no, dsps);
1864             return SPECIFIC_INT_RESTART;
1865         }
1866 
1867         printk ("scsi%d : unknown user interrupt 0x%x\n", 
1868             host->host_no, (unsigned) dsps);
1869         return SPECIFIC_INT_PANIC;
1870     }
1871 }
1872 
1873 /* 
1874  * XXX - the stock NCR assembler won't output the scriptu.h file,
1875  * which undefine's all #define'd CPP symbols from the script.h
1876  * file, which will create problems if you use multiple scripts
1877  * with the same  symbol names.
1878  *
1879  * If you insist on using NCR's assembler, you could generate
1880  * scriptu.h from script.h using something like 
1881  *
1882  * grep #define script.h | \
1883  * sed 's/#define[      ][      ]*\([_a-zA-Z][_a-zA-Z0-9]*\).*$/#undefine \1/' \
1884  * > scriptu.h
1885  */
1886 
1887 #include "53c8xx_u.h"
1888 
1889 /* XXX - add alternate script handling code here */
1890 
1891 
1892 #ifdef NCR_DEBUG
1893 /*
1894  * Debugging without a debugger is no fun. So, I've provided 
1895  * a debugging interface in the NCR53c7x0 driver.  To avoid
1896  * kernel cruft, there's just enough here to act as an interface
1897  * to a user level debugger (aka, GDB).
1898  *
1899  *
1900  * The following restrictions apply to debugger commands : 
1901  * 1.  The command must be terminated by a newline.
1902  * 2.  Command length must be less than 80 bytes including the 
1903  *      newline.
1904  * 3.  The entire command must be written with one system call.
1905  */
1906 
1907 static const char debugger_help = 
1908 "bc <addr>                      - clear breakpoint\n"
1909 "bl                             - list breakpoints\n"
1910 "bs <addr>                      - set breakpoint\n"
1911 "g                              - start\n"                              
1912 "h                              - halt\n"
1913 "?                              - this message\n"
1914 "i                              - info\n"
1915 "mp <addr> <size>               - print memory\n"
1916 "ms <addr> <size> <value>       - store memory\n"
1917 "rp <num> <size>                - print register\n"
1918 "rs <num> <size> <value>        - store register\n"
1919 "s                              - single step\n"        
1920 "tb                             - begin trace \n"
1921 "te                             - end trace\n";
1922 
1923 /*
1924  * Whenever we change a break point, we should probably 
1925  * set the NCR up so that it is in a single step mode.
1926  */
1927 
1928 static int debugger_fn_bc (struct Scsi_Host *host, struct debugger_token *token,
     /*  */
1929     unsigned long args[]) {
1930     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1931         instance->hostdata;
1932     struct NCR53c7x0_break *bp, **prev;
1933     int old_level;
1934     old_level = splx(0);
1935     for (bp = (struct NCR53c7x0_break *) instance->breakpoints,
1936             prev = (struct NCR53c7x0_break **) &instance->breakpoints;
1937             bp; prev = (struct NCR53c7x0_break **) &(bp->next),
1938             bp = (struct NCR53c7x0_break *) bp->next);
1939 
1940     if (!bp) {
1941         splx(old_level);
1942         return -EIO;
1943     }
1944 
1945     /* 
1946      * XXX - we need to insure that the processor is halted 
1947      * here in order to prevent a race condition.
1948      */
1949     
1950     memcpy ((void *) bp->addr, (void *) bp->old, sizeof(bp->old));
1951     if (prev)
1952         *prev = bp->next;
1953 
1954     splx(old_level);
1955     return 0;
1956 }
1957 
1958 
1959 static int debugger_fn_bl (struct Scsi_Host *host, struct debugger_token *token,
     /*  */
1960     unsigned long args[]) {
1961     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1962         host->hostdata;
1963     struct NCR53c7x0_break *bp;
1964     char buf[80];
1965     size_t len;
1966     int old_level;
1967     /* 
1968      * XXX - we need to insure that the processor is halted 
1969      * here in order to prevent a race condition.  So, if the 
1970      * processor isn't halted, print an error message and continue.
1971      */
1972 
1973     sprintf (buf, "scsi%d : bp : warning : processor not halted\b",
1974         host->host_no);
1975     debugger_kernel_write (host, buf, strlen(buf));
1976 
1977     old_level=splx(0);
1978     for (bp = (struct NCR53c7x0_break *) host->breakpoints;
1979             bp; bp = (struct NCR53c7x0_break *) bp->next); {
1980             sprintf (buf, "scsi%d : bp : success : at %08x, replaces %08x %08x",
1981                 bp->addr, bp->old[0], bp->old[1]);
1982             len = strlen(buf);
1983             if ((bp->old[0] & (DCMD_TYPE_MASK << 24)) ==
1984                 (DCMD_TYPE_MMI << 24)) {
1985                 sprintf(buf + len, "%08x\n", * (long *) bp->addr);
1986             } else {
1987                 sprintf(buf + len, "\n");
1988             }
1989             len = strlen(buf);
1990             debugger_kernel_write (host, buf, len);
1991     }
1992     splx(old_level);
1993     return 0;
1994 }
1995 
1996 static int debugger_fn_bs (struct Scsi_Host *host, struct debugger_token *token,
     /*  */
1997     unsigned long args[]) {
1998     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
1999         host->hostdata;
2000     struct NCR53c7x0_break *bp;
2001     char buf[80];
2002     size_t len;
2003     int old_level;
2004     old_level=splx(0);
2005 
2006     if (hostdata->state != STATE_HALTED) {
2007         sprintf (buf, "scsi%d : bs : failure : NCR not halted\n", host->host_no);
2008         debugger_kernel_write (host, buf, strlen(buf));
2009         splx(old_level);
2010         return -1;
2011     }
2012 
2013     if (!(bp = kmalloc (sizeof (struct NCR53c7x0_break)))) {
2014         printk ("scsi%d : kmalloc(%d) of breakpoint structure failed, try again\n",
2015             host->host_no, sizeof(struct NCR53c7x0_break));
2016         splx(old_level);
2017         return -1;
2018     }
2019 
2020     bp->address = (unsigned long *) args[0];
2021     memcpy ((void *) bp->old_instruction, (void *) bp->address, 8);
2022     bp->old_size = (((bp->old_instruction[0] >> 24) & DCMD_TYPE_MASK) ==
2023         DCMD_TYPE_MMI ? 3 : 2;
2024     bp->next = hostdata->breakpoints;
2025     hostdata->breakpoints = bp->next;
2026     memcpy ((void *) bp->address, (void *) hostdata->E_debug_break, 8);
2027     
2028     splx(old_level);
2029     return 0;
2030 }
2031 
2032 #define TOKEN(name,nargs) {#name, nargs, debugger_fn_##name}
2033 static const struct debugger_token {
2034     char *name;
2035     int numargs;
2036     int (*fn)(struct debugger_token *token, unsigned long args[]);
2037 } debugger_tokens[] = {
2038     TOKEN(bc,1), TOKEN(bl,0), TOKEN(bs,1), TOKEN(g,0), TOKEN(halt,0),
2039     {DT_help, "?", 0} , TOKEN(h,0), TOKEN(i,0), TOKEN(mp,2), 
2040     TOKEN(ms,3), TOKEN(rp,2), TOKEN(rs,2), TOKEN(s,0), TOKEN(tb,0), TOKEN(te,0)
2041 };
2042 
2043 #define NDT sizeof(debugger_tokens / sizeof(struct debugger_token))
2044 
2045 static struct Scsi_Host * inode_to_host (struct inode *inode) {$
2046     int dev;
2047     struct Scsi_Host *tmp;
2048     for (dev = MINOR(inode->rdev), host = first_host;
2049         (host->hostt == the_template); --dev, host = host->next)
2050         if (!dev) return host;
2051     return NULL;
2052 }
2053 
2054 
2055 static debugger_user_write (struct inode *inode,struct file *filp,
     /*  */
2056     char *buf,int count) {
2057     struct Scsi_Host *host;                     /* This SCSI host */
2058     struct NCR53c7x0_hostadata *hostdata;       
2059     char input_buf[80],                         /* Kernel space copy of buf */
2060         *ptr;                                   /* Pointer to argument list */
2061     unsigned long args[3];                      /* Arguments */
2062     int i, j, error, len;
2063 
2064     if (!(host = inode_to_host(inode)))
2065         return -ENXIO;
2066 
2067     hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
2068 
2069     if (error = verify_area(VERIFY_READ,buf,count))
2070         return error;
2071 
2072     if (count > 80) 
2073         return -EIO;
2074 
2075     memcpy_from_fs(input_buf, buf, count);
2076 
2077     if (input_buf[count - 1] != '\n')
2078         return -EIO;
2079 
2080     input_buf[count - 1]=0;
2081 
2082     for (i = 0; i < NDT; ++i) {
2083         len = strlen (debugger_tokens[i].name);
2084         if (!strncmp(input_buf, debugger_tokens[i].name, len)) 
2085             break;
2086     };
2087 
2088     if (i == NDT) 
2089         return -EIO;
2090 
2091     for (ptr = input_buf + len, j = 0; j < debugger_tokens[i].nargs && *ptr;) {
2092         if (*ptr == ' ' || *ptr == '\t') {
2093             ++ptr; 
2094         } else if (isdigit(*ptr)) {
2095             args[j++] = simple_strtoul (ptr, &ptr, 0);
2096         } else {
2097             return -EIO;
2098         } 
2099     }
2100 
2101     if (j != debugger_tokens[i].nargs)
2102         return -EIO;
2103 
2104     return count;
2105 } 
2106 
2107 static debugger_user_read (struct inode *inode,struct file *filp,
     /*  */
2108     char *buf,int count) {
2109     struct Scsi_Host *instance;
2110     
2111 }
2112 
2113 static debugger_kernel_write (struct Scsi_Host *host, char *buf, size_t
     /*  */
2114     buflen) {
2115     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2116         host->hostdata;
2117     int copy, left, old_level;
2118     
2119     old_level = splx(0);
2120     while (buflen) {
2121         left = (hostdata->debug_buf + hostdata->debug_size - 1) -
2122             hostdata->debug_write;
2123         copy = (buflen <= left) ? buflen : left;
2124         memcpy (hostdata->debug_write, buf, copy);
2125         buf += copy;
2126         buflen -= copy;
2127         hostdata->debug_count += copy;
2128         if ((hostdata->debug_write += copy) == 
2129             (hostdata->debug_buf + hostdata->debug_size))
2130             hosdata->debug_write = hostdata->debug_buf;
2131     }
2132     (void) splx(old_level);
2133 }
2134 
2135 #endif /* def NCRDEBUG */
2136 
2137 /* 
2138  * Function : static void NCR538xx_soft_reset (struct Scsi_Host *host)
2139  *
2140  * Purpose :  perform a soft reset of the NCR53c8xx chip
2141  *
2142  * Inputs : host - pointer to this host adapter's structure
2143  *
2144  * Preconditions : NCR53c7x0_init must have been called for this 
2145  *      host.
2146  * 
2147  */
2148 
2149 static void NCR53c8x0_soft_reset (struct Scsi_Host *host) {
     /*  */
2150     NCR53c7x0_local_declare();
2151     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2152         host->hostdata;
2153     NCR53c7x0_local_setup(host);
2154 
2155 
2156     /*
2157      * Do a soft reset of the chip so that everything is 
2158      * reinitialized to the power-on state.
2159      *
2160      * Basically follow the procedure outlined in the NCR53c700
2161      * data manual under Chapter Six, How to Use, Steps Necessary to
2162      * Start SCRIPTS, with the exception of actually starting the 
2163      * script and setting up the synchronous transfer gunk.
2164      */
2165 
2166     NCR53c7x0_write8(ISTAT_REG_800, ISTAT_10_SRST);
2167     NCR53c7x0_write8(ISTAT_REG_800, 0);
2168     NCR53c7x0_write8(hostdata->dmode, hostdata->saved_dmode & ~DMODE_MAN);
2169 
2170 
2171     /* 
2172      * Respond to selection and reselection by targets and 
2173      * use our _initiator_ SCSI ID for arbitration. 
2174      *
2175      * XXX - Note : we must reprogram this when reselecting as 
2176      *  a target.
2177      */
2178 
2179     NCR53c7x0_write8(SCID_REG, (host->this_id & 7)|SCID_800_RRE|SCID_800_SRE);
2180     NCR53c7x0_write8(RESPID_REG_800, hostdata->this_id_mask);
2181 
2182     /*
2183      * Use a maximum (1.6) second handshake to handshake timeout,
2184      * and SCSI recommended .5s selection timeout.
2185      */
2186 
2187     NCR53c7x0_write8(STIME0_REG_800, 
2188         ((14 << STIME0_800_SEL_SHIFT) & STIME0_800_SEL_MASK) 
2189 /* Disable HTH interrupt */
2190 #if 0
2191         | ((15 << STIME0_800_HTH_SHIFT) & STIME0_800_HTH_MASK)
2192 #endif
2193     );
2194 
2195 
2196 
2197     /*
2198      * Enable all interrupts, except parity which we only want when
2199      * the user requests it.
2200      */
2201 
2202     NCR53c7x0_write8(DIEN_REG, DIEN_800_MDPE | DIEN_800_BF |
2203                 DIEN_ABRT | DIEN_SSI | DIEN_SIR | DIEN_800_IID);
2204 
2205     
2206     NCR53c7x0_write8(SIEN0_REG_800, ((hostdata->options & OPTION_PARITY) ?
2207             SIEN_PAR : 0) | SIEN_RST | SIEN_UDC | SIEN_SGE | SIEN_800_SEL |
2208             SIEN_800_RESEL | SIEN_MA);
2209     NCR53c7x0_write8(SIEN1_REG_800, SIEN1_800_STO | SIEN1_800_HTH);
2210 
2211     /* 
2212      * Use saved clock frequency divisor and scripts loaded in 16 bit
2213      * mode flags from the saved dcntl.
2214      */
2215 
2216     NCR53c7x0_write8(DCNTL_REG, hostdata->saved_dcntl);
2217     NCR53c7x0_write8(CTEST4_REG_800, hostdata->saved_ctest4);
2218 
2219     /* Enable active negation */
2220     NCR53c7x0_write8(STEST3_REG_800, STEST3_800_TE);
2221 
2222     
2223 }
2224 
2225 /*
2226  * Function static struct NCR53c7x0_cmd *create_cmd (Scsi_Cmnd *cmd) 
2227  *
2228  * Purpose : Using scsi_malloc() if the system is initialized,
2229  *      scan_scsis_buf if not, allocate space to store the variable
2230  *      length NCR53c7x0_cmd structure.  Initialize it based on 
2231  *      the Scsi_Cmnd structure passed in, including dsa and 
2232  *      Linux field initialization, and dsa code relocation.
2233  *
2234  * Inputs : cmd - SCSI command
2235  *
2236  * Returns : NCR53c7x0_cmd structure corresponding to cmd,
2237  *      NULL on failure.
2238  */
2239 
2240 static struct NCR53c7x0_cmd *create_cmd (Scsi_Cmnd *cmd) {
     /*  */
2241     NCR53c7x0_local_declare();
2242     struct Scsi_Host *host = cmd->host;
2243     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2244         host->hostdata; 
2245     int size;                   /* Size of *tmp */
2246     struct NCR53c7x0_cmd *tmp;  /* NCR53c7x0_cmd structure for this command */
2247     int datain,                 /* Number of instructions per phase */
2248         dataout;
2249     int data_transfer_instructions, /* Count of dynamic instructions */
2250         i,                      /* Counter */
2251         alignment;              /* Alignment adjustment (0 - 4) */
2252     unsigned long *cmd_datain,  /* Address of datain/dataout code */
2253         *cmd_dataout;           /* Incremented as we assemble */
2254     void *real;                 /* Real address */
2255     NCR53c7x0_local_setup(cmd->host);
2256 
2257 
2258     /*
2259      * Decide weather we need to generate commands for DATA IN,
2260      * DATA OUT, neither, or both based on the SCSI command 
2261      */
2262 
2263     switch (cmd->cmnd[0]) {
2264     /* These commands do DATA IN */
2265     case INQUIRY:
2266     case MODE_SENSE:
2267     case READ_6:
2268     case READ_10:
2269     case READ_CAPACITY:
2270     case REQUEST_SENSE:
2271         datain = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
2272         dataout = 0;
2273         break;
2274     /* These commands do DATA OUT */
2275     case MODE_SELECT: 
2276     case WRITE_6:
2277     case WRITE_10:
2278 #if 0
2279         printk("scsi%d : command is ", host->host_no);
2280         print_command(cmd->cmnd);
2281 #endif
2282 #if 0
2283         printk ("scsi%d : %d scatter/gather segments\n", host->host_no,
2284             cmd->use_sg);
2285 #endif
2286         datain = 0;
2287         dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
2288 #if 0
2289         hostdata->options |= OPTION_DEBUG_INTR;
2290 #endif
2291         break;
2292     /* 
2293      * These commands do no data transfer, we should force an
2294      * interrupt if a data phase is attempted on them.
2295      */
2296     case START_STOP:
2297     case TEST_UNIT_READY:
2298         datain = dataout = 0;
2299         break;
2300     /*
2301      * We don't know about these commands, so generate code to handle
2302      * both DATA IN and DATA OUT phases.
2303      */
2304     default:
2305         datain = dataout = 2 * (cmd->use_sg ? cmd->use_sg : 1) + 3;
2306     }
2307 
2308     /*
2309      * Allocate memory for the NCR53c7x0_cmd structure.  
2310      */
2311 
2312     /* 
2313      * For each data phase implemented, we need a JUMP instruction
2314      * to return control to other_transfer.  We also need a MOVE
2315      * and a CALL instruction for each scatter/gather segment.
2316      */
2317 
2318     data_transfer_instructions = datain + dataout;
2319 
2320     /*
2321      * When we perform a request sense, we overwrite various things,
2322      * including the data transfer code.  Make sure we have enough
2323      * space to do that.
2324      */
2325 
2326     if (data_transfer_instructions < 2)
2327         data_transfer_instructions = 2;
2328 
2329     /* 
2330      * We need enough space to store the base NCR53c7x0 structure,
2331      * DSA, and data transfer instructions at 2 long words each,
2332      * as well as padding out to the next 512 bytes for scsi_malloc.
2333      *
2334      * We also need to guarantee alignment of _4_ bytes. 
2335      */
2336 
2337 #ifdef SCSI_MALLOC
2338     size = ((sizeof (struct NCR53c7x0_cmd) + (hostdata->dsa_end - 
2339         hostdata->dsa_start) + 2 * sizeof(long) * 
2340         data_transfer_instructions + 4 + 511) / 512) * 512;             
2341 #else
2342     size = sizeof (struct NCR53c7x0_cmd) + (hostdata->dsa_end - 
2343         hostdata->dsa_start) + 2 * sizeof(long) * 
2344         data_transfer_instructions + 4;
2345 #endif
2346 
2347 
2348 #if 0
2349     if (size > 512) {
2350         printk("scsi%d : size = %d\n", host->host_no, size);
2351     }
2352 #endif
2353 
2354 #ifdef SCSI_MALLOC
2355     real = in_scan_scsis ? NULL : scsi_malloc (size);
2356 #else
2357     real = kmalloc (size, GFP_ATOMIC);
2358 #endif
2359 
2360     if (!real) {
2361         if (!scan_scsis_buf_busy && size <= sizeof(scan_scsis_buf)) {
2362             scan_scsis_buf_busy = 1;
2363             real = scan_scsis_buf;
2364         } else {
2365             panic ("scsi%d : scan_scsis_buf too small (need %d bytes)\n",
2366                 host->host_no, size);
2367         }
2368     }
2369 
2370     alignment = 4 - (((unsigned) real) & 3);
2371 
2372     tmp = (struct NCR53c7x0_cmd *) (((char *) real) + alignment);
2373 
2374     tmp->real = real;
2375 
2376 
2377     if (((unsigned long) tmp->dsa) & 0x3) 
2378         panic ("scsi%d : pid %d dsa structure not dword aligned!\n",
2379             host->host_no, cmd->pid);
2380 
2381     /*
2382      * Initialize Linux specific fields.
2383      */
2384 
2385     tmp->size = size;                   
2386     tmp->cmd = cmd;
2387     tmp->next = NULL;
2388     tmp->prev = NULL;
2389 
2390     /* 
2391      * Calculate addresses of dynamic code to fill in DSA
2392      */
2393 
2394     tmp->data_transfer_start = tmp->dsa + (hostdata->dsa_end - 
2395         hostdata->dsa_start) / sizeof(long);
2396     tmp->data_transfer_end = tmp->data_transfer_start + 
2397         2 * data_transfer_instructions;
2398 
2399     cmd_datain = datain ? tmp->data_transfer_start : NULL;
2400     cmd_dataout = dataout ? (datain ? cmd_datain + 2 * datain : tmp->
2401         data_transfer_start) : NULL;
2402 
2403     /*
2404      * Fill in the NCR53c7x0_cmd structure as follows
2405      * dsa, with fixed up DSA code
2406      * datain code
2407      * dataout code
2408      */
2409 
2410     /* Copy template code into dsa and perform all necessary fixups */
2411     if (hostdata->dsa_fixup)
2412         hostdata->dsa_fixup(tmp);
2413 
2414     patch_dsa_32(tmp->dsa, dsa_next, 0, NULL);
2415     patch_dsa_32(tmp->dsa, dsa_cmnd, 0, cmd);
2416     patch_dsa_32(tmp->dsa, dsa_select, 0, hostdata->sync[cmd->target].
2417         select_indirect);
2418     /*
2419      * XXX - we need to figure this size based on weather
2420      * or not we'll be using any additional messages.
2421      */
2422     patch_dsa_32(tmp->dsa, dsa_msgout, 0, 1);
2423 #if 0
2424     tmp->select[0] = IDENTIFY (1, cmd->lun);
2425 #else
2426     tmp->select[0] = IDENTIFY (0, cmd->lun);
2427 #endif
2428     patch_dsa_32(tmp->dsa, dsa_msgout, 1, tmp->select);
2429     patch_dsa_32(tmp->dsa, dsa_cmdout, 0, cmd->cmd_len);
2430     patch_dsa_32(tmp->dsa, dsa_cmdout, 1, cmd->cmnd);
2431     patch_dsa_32(tmp->dsa, dsa_dataout, 0, cmd_dataout ? 
2432         cmd_dataout : hostdata->script + hostdata->E_other_transfer / 
2433             sizeof (long));
2434     patch_dsa_32(tmp->dsa, dsa_datain, 0, cmd_datain ? 
2435         cmd_datain : hostdata->script + hostdata->E_other_transfer / 
2436             sizeof (long));
2437     /* 
2438      * XXX - need to make endian aware, should use separate variables
2439      * for both status and message bytes.
2440      */
2441     patch_dsa_32(tmp->dsa, dsa_msgin, 0, 1);
2442     patch_dsa_32(tmp->dsa, dsa_msgin, 1, (((unsigned long) &cmd->result) + 1));
2443     patch_dsa_32(tmp->dsa, dsa_status, 0, 1);
2444     patch_dsa_32(tmp->dsa, dsa_status, 1, &cmd->result);
2445     patch_dsa_32(tmp->dsa, dsa_msgout_other, 0, 1);
2446     patch_dsa_32(tmp->dsa, dsa_msgout_other, 1, 
2447         &NCR53c7xx_msg_nop);
2448 
2449     
2450     /*
2451      * Generate code for zero or more of the DATA IN, DATA OUT phases 
2452      * in the format 
2453      *
2454      * MOVE first buffer length, first buffer address, WHEN phase
2455      * CALL msgin, WHEN MSG_IN 
2456      * ...
2457      * MOVE last buffer length, last buffer address, WHEN phase
2458      * JUMP other_transfer
2459      */
2460 
2461 /* See if we're getting to data transfer */
2462 #if 0
2463     if (datain) {
2464         cmd_datain[0] = 0x98080000;
2465         cmd_datain[1] = 0x03ffd00d;
2466         cmd_datain += 2;
2467     }
2468 #endif
2469 
2470 /* 
2471  * XXX - I'm undecided weather all of this nonsense is faster
2472  * in the long run, or weather I should just go and implement a loop
2473  * on the NCR chip using table indirect mode?
2474  *
2475  * In any case, this is how it _must_ be done for 53c700/700-66 chips,
2476  * so this stays even when we come up with something better.
2477  *
2478  * When we're limited to 1 simultaneous command, no overlapping processing,
2479  * we're seeing 630K/sec, with 7% CPU usage on a slow Syquest 45M
2480  * drive.
2481  *
2482  * Not bad, not good. We'll see.
2483  */
2484 
2485     for (i = 0; cmd->use_sg ? (i < cmd->use_sg) : !i; cmd_datain += 4, 
2486         cmd_dataout += 4, ++i) {
2487         unsigned long buf = (unsigned long) (cmd->use_sg ? 
2488             ((struct scatterlist *)cmd->buffer)[i].address :
2489             cmd->request_buffer);
2490         unsigned long count = (unsigned long) (cmd->use_sg ?
2491             ((struct scatterlist *)cmd->buffer)[i].length :
2492             cmd->request_bufflen);
2493 
2494         if (datain) {
2495             cmd_datain[0] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I | DCMD_BMI_IO) 
2496                 << 24) | count;
2497             cmd_datain[1] = buf;
2498             cmd_datain[2] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL | 
2499                 DCMD_TCI_CD | DCMD_TCI_IO | DCMD_TCI_MSG) << 24) | 
2500                 DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE | DBC_TCI_TRUE;
2501             cmd_datain[3] = hostdata->script + hostdata->E_msg_in / 
2502                 sizeof(long);
2503 #if 0
2504             print_insn (host, cmd_datain, "dynamic ", 1);
2505             print_insn (host, cmd_datain + 2, "dynamic ", 1);
2506 #endif
2507         }
2508         if (dataout) {
2509             cmd_dataout[0] = ((DCMD_TYPE_BMI | DCMD_BMI_OP_MOVE_I) << 24) 
2510                 | count;
2511             cmd_dataout[1] = buf;
2512             cmd_dataout[2] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_CALL | 
2513                 DCMD_TCI_CD | DCMD_TCI_IO | DCMD_TCI_MSG) << 24) | 
2514                 DBC_TCI_WAIT_FOR_VALID | DBC_TCI_COMPARE_PHASE | DBC_TCI_TRUE;
2515             cmd_dataout[3] = hostdata->script + hostdata->E_msg_in /
2516                 sizeof(long);
2517 #if 0
2518             print_insn (host, cmd_dataout, "dynamic ", 1);
2519             print_insn (host, cmd_dataout + 2, "dynamic ", 1);
2520 #endif
2521         }
2522     }
2523 
2524     /*
2525      * Install JUMP instructions after the data transfer routines to return
2526      * control to the do_other_transfer routines.
2527      */
2528   
2529     
2530     if (datain) {
2531         cmd_datain[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
2532             DBC_TCI_TRUE;
2533         cmd_datain[1] = hostdata->script + hostdata->E_other_transfer
2534             / sizeof(long);
2535 #if 0
2536         print_insn (host, cmd_datain, "dynamic jump ", 1);
2537 #endif
2538         cmd_datain += 2; 
2539     }
2540 #if 0
2541     if (datain) {
2542         cmd_datain[0] = 0x98080000;
2543         cmd_datain[1] = 0x03ffdeed;
2544         cmd_datain += 2;
2545     }
2546 #endif
2547 
2548 
2549     if (dataout) {
2550         cmd_dataout[0] = ((DCMD_TYPE_TCI | DCMD_TCI_OP_JUMP) << 24) |
2551             DBC_TCI_TRUE;
2552         cmd_dataout[1] = hostdata->script + hostdata->E_other_transfer
2553             / sizeof(long);
2554 #if 0
2555         print_insn (host, cmd_dataout, "dynamic jump ", 1);
2556 #endif
2557         cmd_dataout += 2;
2558     }
2559 
2560 
2561     return tmp;
2562 }
2563     
2564 /* 
2565  * Function : int NCR53c7xx_queue_command (Scsi_Cmnd *cmd,
2566  *      void (*done)(Scsi_Cmnd *)) 
2567  *
2568  * Purpose :  enqueues a SCSI command
2569  *
2570  * Inputs : cmd - SCSI command, done - function called on completion, with
2571  *      a pointer to the command descriptor.
2572  * 
2573  * Returns : 0
2574  *
2575  * Side effects : 
2576  *      cmd is added to the per instance issue_queue, with minor 
2577  *      twiddling done to the host specific fields of cmd.  If the 
2578  *      main coroutine is not running, it is restarted.
2579  *
2580  */
2581 
2582 int NCR53c7xx_queue_command (Scsi_Cmnd *cmd, void (* done)(Scsi_Cmnd *)) {
     /*  */
2583     NCR53c7x0_local_declare();
2584     struct NCR53c7x0_cmd *tmp;
2585     struct Scsi_Host *host = cmd->host;
2586     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
2587         host->hostdata;
2588     int old_level;
2589     unsigned char target_was_busy;
2590     NCR53c7x0_local_setup(host);
2591     
2592     if (((hostdata->options & (OPTION_DEBUG_INIT_ONLY|OPTION_DEBUG_PROBE_ONLY)) ||
2593         ((hostdata->options & OPTION_DEBUG_TARGET_LIMIT) &&
2594         !(hostdata->debug_lun_limit[cmd->target] & (1 << cmd->lun)))) ||
2595         cmd->target > 7) {
2596         printk("scsi%d : disabled target %d lun %d\n", host->host_no,
2597             cmd->target, cmd->lun);
2598         cmd->result = (DID_BAD_TARGET << 16);
2599         done(cmd);
2600         return 0;
2601     }
2602 
2603     if (hostdata->options & OPTION_DEBUG_NCOMMANDS_LIMIT) {
2604         if (hostdata->debug_count_limit == 0) {
2605             printk("scsi%d : maximum commands exceeded\n", host->host_no);
2606             cmd->result = (DID_BAD_TARGET << 16);
2607             done(cmd);
2608             return 0;
2609         } else if (hostdata->debug_count_limit != -1) 
2610             --hostdata->debug_count_limit;
2611     }
2612    
2613     if (hostdata->options & OPTION_DEBUG_READ_ONLY) {
2614         switch (cmd->cmnd[0]) {
2615         case WRITE_6:
2616         case WRITE_10:
2617             printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
2618                 host->host_no);
2619             cmd->result = (DID_BAD_TARGET << 16);
2620             done(cmd);
2621             return 0;
2622         }
2623     }
2624 
2625     cmd->scsi_done = done;
2626     cmd->result = 0xffff;               /* The NCR will overwrite message
2627                                            and status with valid data */
2628     
2629     cmd->host_scribble = (unsigned char *) tmp = create_cmd (cmd);
2630 
2631     /*
2632      * On NCR53c710 and better chips, we have two issue queues : 
2633      * The queue maintained by the Linux driver, and the queue 
2634      * maintained by the NCR chip.
2635      * 
2636      * The Linux queue includes commands which have been generated,
2637      * but may be unable to execute because the device is busy, 
2638      * where as the NCR queue contains commands to issue as soon
2639      * as BUS FREE is detected.
2640      *
2641      * NCR53c700 and NCR53c700-66 chips use only the Linux driver
2642      * queue. 
2643      * 
2644      * So, insert into the Linux queue if the device is busy or 
2645      * we are running on an old chip, otherwise insert directly into
2646      * the NCR queue.
2647      */
2648     
2649     /*
2650      * REQUEST sense commands need to be executed before all other 
2651      * commands since any command will clear the contingent allegiance 
2652      * condition that exists and the sense data is only guaranteed to be 
2653      * valid while the condition exists.
2654      */
2655 
2656     old_level = splx(0);
2657 
2658     /* 
2659      * Consider a target busy if there are _any_ commands running
2660      * on it.  
2661      * XXX - Once we do SCSI-II tagged queuing, we want to use 
2662      *     a different definition of busy.
2663      */
2664         
2665     target_was_busy = hostdata->busy[cmd->target][cmd->lun]
2666 #ifdef LUN_BUSY
2667         ++
2668 #endif
2669 ; 
2670 
2671     if (!(hostdata->options & OPTION_700)  &&
2672         !target_was_busy) {
2673         unsigned char *dsa = ((unsigned char *) tmp->dsa)
2674                 - hostdata->dsa_start;  
2675                 /* dsa start is negative, so subtraction is used */
2676 #if 0   
2677         printk("scsi%d : new dsa is 0x%x\n", host->host_no, (unsigned) dsa);
2678 #endif
2679 
2680         if (hostdata->running_list)
2681             hostdata->running_list->prev = tmp;
2682 
2683         tmp->next = hostdata->running_list;
2684 
2685         if (!hostdata->running_list)
2686             hostdata->running_list = tmp;
2687         
2688 
2689         if (hostdata->idle) {
2690             hostdata->idle = 0;
2691             hostdata->state = STATE_RUNNING;
2692             NCR53c7x0_write32 (DSP_REG,  ((unsigned long) hostdata->script) +
2693                 hostdata->E_schedule);
2694         }
2695 
2696 /* XXX - make function */
2697         for (;;) {
2698             /* 
2699              * If the NCR doesn't have any commands waiting in its
2700              * issue queue, then we simply create a new issue queue,
2701              * and signal the NCR that we have more commands.
2702              */
2703                 
2704             if (!hostdata->issue_dsa_head) {
2705 #if 0
2706                 printk ("scsi%d : no issue queue\n", host->host_no);
2707 #endif
2708                 hostdata->issue_dsa_tail = hostdata->issue_dsa_head = dsa;
2709                 NCR53c7x0_write8(hostdata->istat, 
2710                     NCR53c7x0_read8(hostdata->istat) | ISTAT_10_SIGP);
2711                 break;
2712             /*
2713              * Otherwise, we blindly perform an atomic write 
2714              * to the next pointer of the last command we 
2715              * placed in that queue.
2716              *
2717              * Looks like it doesn't work, but I think it does - 
2718              */
2719             } else {
2720                 printk ("scsi%d : existing issue queue\n", host->host_no);
2721             /* XXX - Replace with XCHG or equivalent */
2722                 hostdata->issue_dsa_tail = *((unsigned char **) 
2723                     (hostdata->issue_dsa_tail + hostdata->dsa_next)) = dsa;
2724             /*
2725              * After which, one of two things will happen : 
2726              * The NCR will have scheduled a command, either this
2727              * one, or the next one.  In this case, we successfully
2728              * added our command to the queue.
2729              *
2730              * The NCR will have written the hostdata->issue_dsa_head
2731              * pointer with the NULL pointer terminating the list,
2732              * in which case we were too late.  If this happens,
2733              * we restart
2734              */
2735                 if (hostdata->issue_dsa_head)
2736                     break;
2737             }
2738         }
2739 /* XXX - end */
2740     } else {
2741 #if 1
2742         printk ("scsi%d : using issue_queue instead of issue_dsa_head!\n",
2743             host->host_no);
2744 #endif
2745         for (tmp = (struct NCR53c7x0_cmd *) hostdata->issue_queue; 
2746             tmp->next; tmp = (struct NCR53c7x0_cmd *) tmp->next);
2747         tmp->next = tmp;
2748     }
2749     splx(old_level);
2750     return 0;
2751 }
2752 
2753 
2754 int fix_pointers (unsigned long dsa) {
     /*  */
2755     return 0;
2756 }
2757 
2758 /*
2759  * Function : static void intr_scsi (struct Scsi_Host *host, 
2760  *      struct NCR53c7x0_cmd *cmd)
2761  *
2762  * Purpose : handle all SCSI interrupts, indicated by the setting 
2763  *      of the SIP bit in the ISTAT register.
2764  *
2765  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
2766  *      may be NULL.
2767  */
2768 
2769 static void intr_scsi (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
     /*  */
2770     NCR53c7x0_local_declare();
2771     struct NCR53c7x0_hostdata *hostdata = 
2772         (struct NCR53c7x0_hostdata *) host->hostdata;
2773     unsigned char sstat0_sist0, sist1,          /* Registers */
2774             fatal;                              /* Did a fatal interrupt 
2775                                                    occur ? */
2776     NCR53c7x0_local_setup(host);
2777 
2778     fatal = 0;
2779   
2780     if ((hostdata->chip / 100) == 8) {
2781         sstat0_sist0 = NCR53c7x0_read8(SIST0_REG_800);
2782         udelay(1);
2783         sist1 = NCR53c7x0_read8(SIST1_REG_800);
2784     } else {
2785         sstat0_sist0 = NCR53c7x0_read8(SSTAT0_REG);
2786         sist1 = 0;
2787     }
2788 
2789     if (hostdata->options & OPTION_DEBUG_INTR) 
2790         printk ("scsi%d : SIST0 0x%0x, SIST1 0x%0x\n", host->host_no,
2791             sstat0_sist0, sist1);
2792 
2793     /* 250ms selection timeout */
2794     if ((((hostdata->chip / 100) == 8) && (sist1 & SIST1_800_STO)) || 
2795         (((hostdata->chip / 100) != 8) && sstat0_sist0 && SSTAT0_700_STO)) {
2796         fatal = 1;
2797         if (hostdata->options & OPTION_DEBUG_INTR) {
2798             printk ("scsi%d : Selection Timeout\n", host->host_no);
2799             if (cmd) {
2800                 printk("scsi%d : target %d, lun %d, command ",
2801                     host->host_no, cmd->cmd->target, cmd->cmd->lun);
2802                 print_command (cmd->cmd->cmnd);
2803                 printk("scsi%d : dsp = 0x%x\n", host->host_no,
2804                     (unsigned) NCR53c7x0_read32(DSP_REG));
2805             } else {
2806                 printk("scsi%d : no command\n", host->host_no);
2807             }
2808         }
2809 /*
2810  * XXX - question : how do we want to handle the Illegal Instruction
2811  *      interrupt, which may occur before or after the Selection Timeout
2812  *      interrupt?
2813  */
2814 
2815         if (1) {
2816             hostdata->idle = 1;
2817             hostdata->expecting_sto = 0;
2818 
2819             if (hostdata->test_running) {
2820                 hostdata->test_running = 0;
2821                 hostdata->test_completed = 3;
2822             } else if (cmd) {
2823                 abnormal_finished(cmd, DID_BAD_TARGET << 16);
2824             }
2825 #if 0       
2826             hostdata->intrs = 0;
2827 #endif
2828         }
2829     } 
2830     
2831     if (sstat0_sist0 & SSTAT0_UDC) {
2832         fatal = 1;
2833         printk("scsi%d : target %d lun %d unexpected disconnect\n",
2834             host->host_no, cmd->cmd->target, cmd->cmd->lun);
2835         if (cmd) {
2836             abnormal_finished(cmd, DID_ERROR << 16);
2837         }
2838         hostdata->dsp = hostdata->script + hostdata->E_schedule / 
2839             sizeof(long);
2840         hostdata->dsp_changed = 1;
2841     /* SCSI PARITY error */
2842     } 
2843 
2844     if (sstat0_sist0 & SSTAT0_PAR) {
2845         fatal = 1;
2846         if (cmd && cmd->cmd) {
2847             printk("scsi%d : target %d lun %d parity error.\n",
2848                 host->host_no, cmd->cmd->target, cmd->cmd->lun);
2849             abnormal_finished (cmd, DID_PARITY << 16); 
2850         } else
2851             printk("scsi%d : parity error\n", host->host_no);
2852         /* Should send message out, parity error */
2853 
2854         /* XXX - Reduce synchronous transfer rate! */
2855         hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
2856             sizeof(long);
2857         hostdata->dsp_changed = 1; 
2858     /* SCSI GROSS error */
2859     } 
2860 
2861     if (sstat0_sist0 & SSTAT0_SGE) {
2862         fatal = 1;
2863         printk("scsi%d : gross error\n", host->host_no);
2864         /* XXX Reduce synchronous transfer rate! */
2865         hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
2866             sizeof(long);
2867         hostdata->dsp_changed = 1;
2868     /* Phase mismatch */
2869     } 
2870 
2871     if (sstat0_sist0 & SSTAT0_MA) {
2872         fatal = 1;
2873         if (hostdata->options & OPTION_DEBUG_INTR)
2874             printk ("scsi%d : SSTAT0_MA\n", host->host_no);
2875         intr_phase_mismatch (host, cmd);
2876     }
2877 
2878 #if 1
2879 /*
2880  * If a fatal SCSI interrupt occurs, we must insure that the DMA and
2881  * SCSI FIFOs were flushed.
2882  */
2883 
2884     if (fatal) {
2885         if (!hostdata->dstat_valid) {
2886             hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
2887             hostdata->dstat_valid = 1;
2888         }
2889 
2890 /* XXX - code check for 700/800 chips */
2891         if (!(hostdata->dstat & DSTAT_DFE)) {
2892             printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
2893 #if 0
2894             if (NCR53c7x0_read8 (CTEST2_REG_800) & CTEST2_800_DDIR) {
2895                 NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_FLF);
2896                 while (!((hostdata->dstat = NCR53c7x0_read8(DSTAT_REG)) &
2897                     DSTAT_DFE));
2898             } else 
2899 #endif
2900             {
2901                 NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_CLF);
2902                 while (NCR53c7x0_read8 (CTEST3_REG_800) & CTEST3_800_CLF);
2903             }
2904         }
2905 
2906         NCR53c7x0_write8 (STEST3_REG_800, STEST3_800_CSF);
2907         while (NCR53c7x0_read8 (STEST3_REG_800) & STEST3_800_CSF);
2908     }
2909 #endif
2910 }
2911 
2912 /*
2913  * Function : static void NCR53c7x0_intr (int irq)
2914  *
2915  * Purpose : handle NCR53c7x0 interrupts for all NCR devices sharing
2916  *      the same IRQ line.  
2917  * 
2918  * Inputs : Since we're using the SA_INTERRUPT interrupt handler
2919  *      semantics, irq indicates the interrupt which invoked 
2920  *      this handler.  
2921  */
2922 
2923 static void NCR53c7x0_intr (int irq) {
     /*  */
2924     NCR53c7x0_local_declare();
2925     struct Scsi_Host *host;                     /* Host we are looking at */
2926     unsigned char istat;                        /* Values of interrupt regs */
2927     struct NCR53c7x0_hostdata *hostdata;        /* host->hostdata */
2928     struct NCR53c7x0_cmd *cmd,                  /* command which halted */
2929         **cmd_prev_ptr;
2930     unsigned long *dsa;                         /* DSA */
2931     int done = 1;                               /* Indicates when handler 
2932                                                    should terminate */
2933     int interrupted = 0;                        /* This HA generated 
2934                                                    an interrupt */
2935     int old_level;                              
2936 
2937 #ifdef NCR_DEBUG
2938     char buf[80];                               /* Debugging sprintf buffer */
2939     size_t buflen;                              /* Length of same */
2940 #endif
2941 
2942 #if 0
2943     printk("interrupt %d received\n", irq);
2944 #endif
2945 
2946     do {
2947         done = 1;
2948         for (host = first_host; host; host = hostdata->next ?
2949              hostdata->next : NULL) {
2950             NCR53c7x0_local_setup(host);
2951 
2952             hostdata = (struct NCR53c7x0_hostdata *) host->hostdata;
2953             hostdata->dsp_changed = 0;
2954             interrupted = 0;
2955 
2956 
2957             do {
2958                 hostdata->dstat_valid = 0;
2959                 interrupted = 0;
2960                 /*
2961                  * Only read istat once, since reading it again will unstack
2962                  * interrupts.
2963                  */
2964                 istat = NCR53c7x0_read8(hostdata->istat);
2965 
2966                 /*
2967                  * INTFLY interrupts are used by the NCR53c720, NCR53c810,
2968                  * and NCR53c820 to signify completion of a command.  Since 
2969                  * the SCSI processor continues running, we can't just look
2970                  * at the contents of the DSA register and continue running.
2971                  */
2972 /* XXX - this is getting big, and should move to intr_intfly() */
2973                 if ((hostdata->options & OPTION_INTFLY) && 
2974                     ((hostdata->chip / 100) == 8 && (istat & ISTAT_800_INTF))) {
2975                     char search_found = 0;      /* Got at least one ? */
2976                     done = 0;
2977                     interrupted = 1;
2978 
2979                     /* 
2980                      * Clear the INTF bit by writing a one.  This reset operation 
2981                      * is self-clearing.
2982                      */
2983                     NCR53c7x0_write8(hostdata->istat, istat|ISTAT_800_INTF);
2984 
2985                     if (hostdata->options & OPTION_DEBUG_INTR)
2986                         printk ("scsi%d : INTFLY\n", host->host_no); 
2987 
2988                     /*
2989                      * Traverse our list of running commands, and look
2990                      * for those with valid (non-0xff ff) status and message
2991                      * bytes encoded in the result which signify command
2992                      * completion.
2993                      */
2994 
2995 
2996                     old_level = splx(0);
2997 restart:
2998                     for (cmd_prev_ptr = (struct NCR53c7x0_cmd **) 
2999                         &(hostdata->running_list), cmd = (struct NCR53c7x0_cmd *)
3000                         hostdata->running_list; cmd ; cmd_prev_ptr = 
3001                         &(cmd->next), cmd = (struct NCR53c7x0_cmd *) cmd->next) {
3002                         Scsi_Cmnd *tmp;
3003 
3004                         if (!cmd) {
3005                             printk("scsi%d : very weird.\n", host->host_no);
3006                             break;
3007                         }
3008 
3009                         if (!(tmp = cmd->cmd)) {
3010                             printk("scsi%d : weird.  NCR53c7x0_cmd has no Scsi_Cmnd\n",
3011                                 host->host_no);
3012                                 continue;
3013                         }
3014 #if 0
3015                         printk ("scsi%d : looking at result of 0x%x\n",
3016                             host->host_no, cmd->cmd->result);
3017 #endif
3018                 
3019                         if (((tmp->result & 0xff) == 0xff) ||
3020                             ((tmp->result & 0xff00) == 0xff00))
3021                             continue;
3022 
3023                         search_found = 1;
3024 
3025                         /* Important - remove from list _before_ done is called */
3026                         /* XXX - SLL.  Seems like DLL is unnecessary */
3027                         if (cmd->prev)
3028                             cmd->prev->next = cmd->next;
3029                         if (cmd_prev_ptr)
3030                             *cmd_prev_ptr = cmd->next;
3031 
3032 #ifdef LUN_BUSY
3033                         /* Check for next command for target, add to issue queue */
3034                         if (--hostdata->busy[tmp->target][tmp->lun]) {
3035                         }
3036 #endif
3037 
3038 
3039                         if (!scan_scsis_buf_busy) {
3040 #ifdef SCSI_MALLOC
3041                             scsi_free ((void *) cmd->real, cmd->size);
3042 #else
3043                             kfree_s ((void *) cmd->real, cmd->size);
3044 #endif
3045                         } else {
3046                             scan_scsis_buf_busy = 0;
3047                         }
3048 
3049 
3050                         tmp->host_scribble = NULL;
3051 
3052                         if (hostdata->options & OPTION_DEBUG_INTR) {
3053                             printk ("scsi%d : command complete : pid %lu, id %d,lun %d result 0x%x ", 
3054                                 host->host_no, tmp->pid, tmp->target, tmp->lun, tmp->result);
3055                             print_command (tmp->cmnd);
3056                         }
3057 
3058                         
3059 #if 0
3060                         hostdata->options &= ~OPTION_DEBUG_INTR;
3061 #endif
3062                         tmp->scsi_done(tmp);
3063                         goto restart;
3064 
3065                     }
3066                     splx(old_level);
3067 
3068                     if (!search_found)  {
3069                         printk ("scsi%d : WARNING : INTFLY with no completed commands.\n",
3070                             host->host_no);
3071                     }
3072                 }
3073 
3074                 if (istat & (ISTAT_SIP|ISTAT_DIP)) {
3075                     done = 0;
3076                     interrupted = 1;
3077                     hostdata->state = STATE_HALTED;
3078                     /*
3079                      * NCR53c700 and NCR53c700-66 change the current SCSI
3080                      * process, hostdata->current, in the Linux driver so
3081                      * cmd = hostdata->current.
3082                      *
3083                      * With other chips, we must look through the commands
3084                      * executing and find the command structure which 
3085                      * corresponds to the DSA register.
3086                      */
3087 
3088                     if (hostdata->options & OPTION_700) {
3089                         cmd = (struct NCR53c7x0_cmd *) hostdata->current;
3090                     } else {
3091                         dsa = (unsigned long *) NCR53c7x0_read32(DSA_REG);
3092                         for (cmd = (struct NCR53c7x0_cmd *) 
3093                             hostdata->running_list; cmd &&
3094                             (dsa + (hostdata->dsa_start / sizeof(long))) != 
3095                                 cmd->dsa;
3096                             cmd = (struct NCR53c7x0_cmd *)(cmd->next));
3097                     }
3098                     if (hostdata->options & OPTION_DEBUG_INTR) {
3099                         if (cmd) {
3100                             printk("scsi%d : interrupt for pid %lu, id %d, lun %d ", 
3101                                 host->host_no, cmd->cmd->pid, (int) cmd->cmd->target,
3102                                 (int) cmd->cmd->lun);
3103                             print_command (cmd->cmd->cmnd);
3104                         } else {
3105                             printk("scsi%d : no active command\n", host->host_no);
3106                         }
3107                     }
3108 
3109                     if (istat & ISTAT_SIP) {
3110                         if (hostdata->options & OPTION_DEBUG_INTR) 
3111                             printk ("scsi%d : ISTAT_SIP\n", host->host_no);
3112                         intr_scsi (host, cmd);
3113                     }
3114                 
3115                     if (istat & ISTAT_DIP) {
3116                         if (hostdata->options & OPTION_DEBUG_INTR) 
3117                             printk ("scsi%d : ISTAT_DIP\n", host->host_no);
3118                         intr_dma (host, cmd);
3119                     }
3120 
3121                     if (!hostdata->dstat_valid) {
3122                         hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
3123                         hostdata->dstat_valid = 1;
3124                     }
3125 
3126 #if 1
3127             /* XXX - code check for 700/800 chips */
3128                     if (!(hostdata->dstat & DSTAT_DFE)) {
3129                         printk ("scsi%d : DMA FIFO not empty\n", host->host_no);
3130             #if 0
3131                         if (NCR53c7x0_read8 (CTEST2_REG_800) & CTEST2_800_DDIR) {
3132                             NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_FLF);
3133                             while (!((hostdata->dstat = NCR53c7x0_read8(DSTAT_REG)) &
3134                                 DSTAT_DFE));
3135                         } else 
3136             #endif
3137                         {
3138                             NCR53c7x0_write8 (CTEST3_REG_800, CTEST3_800_CLF);
3139                             while (NCR53c7x0_read8 (CTEST3_REG_800) & CTEST3_800_CLF);
3140                         }
3141                     }
3142 #endif
3143                 }
3144             } while (interrupted);
3145 
3146 
3147 
3148             if (hostdata->intrs != -1)
3149                 hostdata->intrs++;
3150 #if 0
3151             if (hostdata->intrs > 4) {
3152                 printk("scsi%d : too many interrupts, halting", host->host_no);
3153                 hostdata->idle = 1;
3154                 hostdata->options |= OPTION_DEBUG_INIT_ONLY;
3155                 panic("dying...\n");
3156             }
3157 #endif
3158 
3159             if (!hostdata->idle && hostdata->state == STATE_HALTED) {
3160                 if (!hostdata->dsp_changed) {
3161                     hostdata->dsp = (unsigned long *) NCR53c7x0_read32(DSP_REG);
3162                 }
3163                         
3164 #if 0
3165                 printk("scsi%d : new dsp is 0x%lx\n", host->host_no, 
3166                     (long) hostdata->dsp);
3167 #endif
3168                 
3169                 hostdata->state = STATE_RUNNING;
3170                 NCR53c7x0_write32 (DSP_REG, (unsigned long) hostdata->dsp);
3171             }
3172         }
3173     } while (!done);
3174 }
3175 
3176 
3177 /* 
3178  * Function : static int abort_connected (struct Scsi_Host *host)
3179  *
3180  * Purpose : Assuming that the NCR SCSI processor is currently 
3181  *      halted, break the currently established nexus.  Clean
3182  *      up of the NCR53c7x0_cmd and Scsi_Cmnd structures should
3183  *      be done on receipt of the abort interrupt.
3184  *
3185  * Inputs : host - SCSI host
3186  *
3187  */
3188 
3189 static int abort_connected (struct Scsi_Host *host) {
     /*  */
3190     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
3191         host->hostdata;
3192 
3193     hostdata->dsp = hostdata->script + hostdata->E_initiator_abort /
3194         sizeof(long);
3195     hostdata->dsp_changed = 1;
3196     printk ("scsi%d : DANGER : abort_connected() called \n",
3197         host->host_no);
3198 /* XXX - need to flag the command as aborted after the abort_connected
3199          code runs 
3200  */
3201     return 0;
3202 }
3203 
3204 
3205 /* 
3206  * Function : static void intr_phase_mismatch (struct Scsi_Host *host, 
3207  *      struct NCR53c7x0_cmd *cmd)
3208  *
3209  * Purpose : Handle phase mismatch interrupts
3210  *
3211  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
3212  *      may be NULL.
3213  *
3214  * Side effects : The abort_connected() routine is called or the NCR chip 
3215  *      is restarted, jumping to the command_complete entry point, or 
3216  *      patching the address and transfer count of the current instruction 
3217  *      and calling the msg_in entry point as appropriate.
3218  *
3219  */
3220 
3221 static void intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd
     /*  */
3222     *cmd) {
3223     NCR53c7x0_local_declare();
3224     unsigned long dbc_dcmd, *dsp, *dsp_next;
3225     unsigned char dcmd, sbcl;
3226     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
3227         host->hostdata;
3228     char *phase;
3229     NCR53c7x0_local_setup(host);
3230 
3231     if (!cmd) {
3232         printk ("scsi%d : phase mismatch interrupt occurred with no current command.\n",
3233             host->host_no);
3234         abort_connected(host);
3235         return;
3236     }
3237 
3238     /*
3239      * Corrective action is based on where in the SCSI SCRIPT(tm) the error 
3240      * occurred, as well as which SCSI phase we are currently in.
3241      */
3242 
3243     dsp_next = (unsigned long *) NCR53c7x0_read32(DSP_REG);
3244 
3245     /*
3246      * Like other processors, the NCR adjusts the DSP pointer before
3247      * instruction decode.  Set the DSP address back to what it should
3248      * be for this instruction based on its size (2 or 3 longs).
3249      */
3250 
3251     dbc_dcmd = NCR53c7x0_read32(DBC_REG);
3252     dcmd = (dbc_dcmd & 0xff000000) >> 24;
3253     dsp = dsp_next - NCR53c7x0_insn_size(dcmd);
3254     
3255     /*
3256      * Read new SCSI phase from the SBCL lines.
3257      *
3258      * Note that since all of our code uses a WHEN conditional instead of an 
3259      * IF conditional, we don't need to wait for a valid REQ.
3260      */
3261     sbcl = NCR53c7x0_read8(SBCL_REG);
3262     switch (sbcl) {
3263     case SBCL_PHASE_DATAIN:
3264         phase = "DATAIN";
3265         break;
3266     case SBCL_PHASE_DATAOUT:
3267         phase = "DATAOUT";
3268         break;
3269     case SBCL_PHASE_MSGIN:
3270         phase = "MSGIN";
3271         break;
3272     case SBCL_PHASE_MSGOUT:
3273         phase = "MSGOUT";
3274         break;
3275     case SBCL_PHASE_CMDOUT:
3276         phase = "CMDOUT";
3277         break;
3278     case SBCL_PHASE_STATIN:
3279         phase = "STATUSIN";
3280         break;
3281     default:
3282         phase = "unknown";
3283         break;
3284     }
3285 
3286 
3287     /*
3288      * The way the SCSI SCRIPTS(tm) are architected, recoverable phase
3289      * mismatches should only occur in the data transfer routines, or
3290      * when a command is being aborted.  
3291      */
3292     if (dsp >= cmd->data_transfer_start & dsp < cmd->data_transfer_end) {
3293 
3294         /*
3295          * There are three instructions used in our data transfer routines with
3296          * a phase conditional on them
3297          *
3298          * 1.  MOVE count, address, WHEN DATA_IN
3299          * 2.  MOVE count, address, WHEN DATA_OUT
3300          * 3.  CALL msg_in, WHEN MSG_IN.
3301          */
3302         switch (sbcl & SBCL_PHASE_MASK) {
3303         /*
3304          * 1.  STATUS phase : pass control to command_complete as if 
3305          *     a JUMP instruction was executed.  No patches are made.
3306          */
3307         case SBCL_PHASE_STATIN:
3308             if (hostdata->options & OPTION_DEBUG_INTR) 
3309                 printk ("scsi%d : new phase = STATIN\n", host->host_no);
3310             hostdata->dsp = hostdata->script + hostdata->E_command_complete /
3311                 sizeof(long);
3312             hostdata->dsp_changed = 1;
3313             return;
3314         /*
3315          * 2.  MSGIN phase : pass control to msg_in as if a CALL
3316          *     instruction was executed.  Patch current instruction.
3317          */
3318 /* 
3319  * XXX - This is buggy.
3320  */
3321         case SBCL_PHASE_MSGIN:
3322             if (hostdata->options & OPTION_DEBUG_INTR) 
3323                 printk ("scsi%d  : new phase = MSGIN\n", host->host_no);
3324             if ((dcmd & (DCMD_TYPE_MASK|DCMD_BMI_OP_MASK|DCMD_BMI_INDIRECT|
3325                     DCMD_BMI_MSG|DCMD_BMI_CD)) == (DCMD_TYPE_BMI|
3326                     DCMD_BMI_OP_MOVE_I)) {
3327                 dsp[0] = dbc_dcmd;
3328                 dsp[1] = NCR53c7x0_read32(DNAD_REG);
3329                 NCR53c7x0_write32(TEMP_REG, (unsigned long) dsp);
3330                 hostdata->dsp = hostdata->script + hostdata->E_msg_in /
3331                     sizeof(long);
3332                 hostdata->dsp_changed = 1;
3333             } else {
3334                 printk("scsi%d : unexpected MSGIN in dynamic NCR code, dcmd=0x%x.\n",
3335                     host->host_no, dcmd);
3336                 print_insn (host, dsp, "", 1);
3337                 print_insn (host, dsp_next, "", 1);
3338                 abort_connected (host);
3339             }
3340             return;
3341         /*
3342          * MSGOUT phase - shouldn't happen, because we haven't 
3343          *              asserted ATN.
3344          * CMDOUT phase - shouldn't happen, since we've already
3345          *              sent a valid command.
3346          * DATAIN/DATAOUT - other one shouldn't happen, since 
3347          *              SCSI commands can ONLY have one or the other.
3348          *
3349          * So, we abort the command if one of these things happens.
3350          */
3351         default:
3352             printk ("scsi%d : unexpected phase %s in data routine\n",
3353                 host->host_no, phase);
3354             abort_connected(host);
3355         } 
3356     /*
3357      * Any other phase mismatches abort the currently executing command.
3358      */
3359     } else {
3360         printk ("scsi%d : unexpected phase %s at dsp = 0x%x\n",
3361             host->host_no, phase, (unsigned) dsp);
3362         print_insn (host, dsp, "", 1);
3363         print_insn (host, dsp_next, "", 1);
3364         abort_connected(host);
3365     }
3366 }
3367 
3368 /*
3369  * Function : static void intr_dma (struct Scsi_Host *host, 
3370  *      struct NCR53c7x0_cmd *cmd)
3371  *
3372  * Purpose : handle all DMA interrupts, indicated by the setting 
3373  *      of the DIP bit in the ISTAT register.
3374  *
3375  * Inputs : host, cmd - host and NCR command causing the interrupt, cmd
3376  *      may be NULL.
3377  */
3378 
3379 static void intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd) {
     /*  */
3380     NCR53c7x0_local_declare();
3381     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
3382         host->hostdata;
3383     unsigned char dstat,        /* DSTAT */     
3384         dbc_dcmd;               /* DCMD (high eight bits) + DBC */
3385     unsigned long *dsp,
3386         *next_dsp,              /* Current dsp */
3387         *dsa;
3388         
3389 
3390     int ipl,                    /* Old ipl from splx(0) */
3391         tmp;
3392     NCR53c7x0_local_setup(host);
3393 
3394     if (!hostdata->dstat_valid) {
3395         hostdata->dstat = NCR53c7x0_read8(DSTAT_REG);
3396         hostdata->dstat_valid = 1;
3397     }
3398     
3399     dstat = hostdata->dstat;
3400     
3401     if (hostdata->options & OPTION_DEBUG_INTR)
3402         printk("scsi%d : DSTAT=0x%x\n", host->host_no, (int) dstat);
3403 
3404     dbc_dcmd = NCR53c7x0_read32 (DBC_REG);
3405     next_dsp = (unsigned long *) NCR53c7x0_read32(DSP_REG);
3406     dsp = next_dsp - NCR53c7x0_insn_size ((dbc_dcmd >> 24) & 0xff);
3407 /* XXX - check chip type */
3408     dsa = (unsigned long *) NCR53c7x0_read32(DSA_REG);
3409 
3410     /*
3411      * DSTAT_ABRT is the aborted interrupt.  This is set whenever the 
3412      * SCSI chip is aborted.  
3413      * 
3414      * With NCR53c700 and NCR53c700-66 style chips, we should only 
3415      * get this when the chip is currently running the accept 
3416      * reselect/select code and we have set the abort bit in the 
3417      * ISTAT register.
3418      *
3419      */
3420     
3421     if (dstat & DSTAT_ABRT) {
3422 #if 0
3423         /* XXX - add code here to deal with normal abort */
3424         if ((hostdata->options & OPTION_700) && (hostdata->state ==
3425             STATE_ABORTING) {
3426         } else 
3427 #endif
3428         {
3429             printk("scsi%d : unexpected abort interrupt at\n" 
3430                    "         ", host->host_no);
3431             print_insn (host, dsp, "s ", 1);
3432             panic(" ");
3433         }
3434     }
3435 
3436     /*
3437      * DSTAT_SSI is the single step interrupt.  Should be generated 
3438      * whenever we have single stepped or are tracing.
3439      */
3440 
3441     if (dstat & DSTAT_SSI) {
3442         if (hostdata->options & OPTION_DEBUG_TRACE) {
3443         } else if (hostdata->options & OPTION_DEBUG_SINGLE) {
3444             print_insn (host, dsp, "s ", 0);
3445             ipl = splx(0);
3446 /* XXX - should we do this, or can we get away with writing dsp? */
3447 
3448             NCR53c7x0_write8 (DCNTL_REG, (NCR53c7x0_read8(DCNTL_REG) & 
3449                 ~DCNTL_SSM) | DCNTL_STD);
3450             splx(ipl);
3451         } else {
3452             printk("scsi%d : unexpected single step interrupt at\n"
3453                    "         ", host->host_no);
3454             print_insn (host, dsp, "", 1);
3455             panic("         mail drew@colorad.edu\n");
3456         }
3457     }
3458 
3459     /*
3460      * DSTAT_IID / DSTAT_OPC (same bit, same meaning, only the name 
3461      * is different) is generated whenever an illegal instruction is 
3462      * encountered.  
3463      * 
3464      * XXX - we may want to emulate INTFLY here, so we can use 
3465      *    the same SCSI SCRIPT (tm) for NCR53c710 through NCR53c810  
3466      *    chips once we remove the ADD WITH CARRY instructions.
3467      */
3468 
3469     if (dstat & DSTAT_OPC) {
3470     /* 
3471      * Ascertain if this IID interrupts occurred before or after a STO 
3472      * interrupt.  Since the interrupt handling code now leaves 
3473      * DSP unmodified until _after_ all stacked interrupts have been
3474      * processed, reading the DSP returns the original DSP register.
3475      * This means that if dsp lies between the select code, and 
3476      * message out following the selection code (where the IID interrupt
3477      * would have to have occurred by due to the implicit wait for REQ),
3478      * we have an IID interrupt resulting from a STO condition and 
3479      * can ignore it.
3480      */
3481 
3482         if (((dsp >= (hostdata->script + hostdata->E_select / sizeof(long))) &&
3483             (dsp <= (hostdata->script + hostdata->E_select_msgout / 
3484             sizeof(long) + 8))) || (hostdata->test_running == 2)) {
3485             if (hostdata->options & OPTION_DEBUG_INTR) 
3486                 printk ("scsi%d : ignoring DSTAT_IID for SSTAT_STO\n",
3487                     host->host_no);
3488             if (hostdata->expecting_iid) {
3489                 hostdata->expecting_iid = 0;
3490                 hostdata->idle = 1;
3491                 if (hostdata->test_running == 2) {
3492                     hostdata->test_running = 0;
3493                     hostdata->test_completed = 3;
3494                 } else if (cmd) 
3495                         abnormal_finished (cmd, DID_BAD_TARGET << 16);
3496             } else {
3497                 hostdata->expecting_sto = 1;
3498             }
3499         } else {
3500             printk("scsi%d : illegal instruction ", host->host_no);
3501             print_insn (host, dsp, "", 1);
3502             printk("scsi%d : DSP=0x%lx, DCMD|DBC=0x%lx, DSA=0x%lx\n"
3503                "         DSPS=0x%lx, TEMP=0x%lx, DMODE=0x%x,\n" 
3504                "         DNAD=0x%lx\n",
3505              host->host_no, (unsigned long) dsp, dbc_dcmd,
3506              (unsigned long) dsa, NCR53c7x0_read32(DSPS_REG),
3507              NCR53c7x0_read32(TEMP_REG), (int) NCR53c7x0_read8(hostdata->dmode),
3508              NCR53c7x0_read32(DNAD_REG));
3509             panic("         mail drew@Colorado.EDU\n");
3510         }
3511     }
3512 
3513     /* 
3514      * DSTAT_BF are bus fault errors, generated when the chip has 
3515      * attempted to access an illegal address.
3516      */
3517     
3518     if (dstat & DSTAT_800_BF) {
3519         printk("scsi%d : BUS FAULT, DSP=0x%lx, DCMD|DBC=0x%lx, DSA=0x%lx\n"
3520                "         DSPS=0x%lx, TEMP=0x%lx, DMODE=0x%x\n", 
3521              host->host_no, (unsigned long) dsp, NCR53c7x0_read32(DBC_REG),
3522              (unsigned long) dsa, NCR53c7x0_read32(DSPS_REG),
3523              NCR53c7x0_read32(TEMP_REG), (int) NCR53c7x0_read8(hostdata->dmode));
3524         print_dsa (host, dsa);
3525         printk("scsi%d : DSP->\n", host->host_no);
3526         print_insn(host, dsp, "", 1);
3527         print_insn(host, next_dsp, "", 1);
3528 #if 0
3529         panic("          mail drew@Colorado.EDU\n");
3530 #else
3531         hostdata->idle = 1;
3532         hostdata->options |= OPTION_DEBUG_INIT_ONLY;
3533 #endif
3534     }
3535         
3536 
3537     /* 
3538      * DSTAT_SIR interrupts are generated by the execution of 
3539      * the INT instruction.  Since the exact values available 
3540      * are determined entirely by the SCSI script running, 
3541      * and are local to a particular script, a unique handler
3542      * is called for each script.
3543      */
3544 
3545     if (dstat & DSTAT_SIR) {
3546         if (hostdata->options & OPTION_DEBUG_INTR)
3547             printk ("scsi%d : DSTAT_SIR\n", host->host_no);
3548         switch ((tmp = hostdata->dstat_sir_intr (host, cmd))) {
3549         case SPECIFIC_INT_NOTHING:
3550         case SPECIFIC_INT_RESTART:
3551             break;
3552         case SPECIFIC_INT_ABORT:
3553             abort_connected(host);
3554             break;
3555         case SPECIFIC_INT_PANIC:
3556             printk("scsi%d : failure at ", host->host_no);
3557             print_insn (host, dsp, "", 1);
3558             panic("          dstat_sir_intr() returned SPECIFIC_INT_PANIC\n");
3559             break;
3560         case SPECIFIC_INT_BREAK:
3561             intr_break (host, cmd);
3562             break;
3563         default:
3564             printk("scsi%d : failure at ", host->host_no);
3565             print_insn (host, dsp, "", 1);
3566             panic("          dstat_sir_intr() returned unknown value %d\n", 
3567                 tmp);
3568         }
3569     } 
3570 
3571 /* All DMA interrupts are fatal.  Flush SCSI queue */
3572     NCR53c7x0_write8 (STEST3_REG_800, STEST3_800_CSF);
3573     while (NCR53c7x0_read8 (STEST3_REG_800) & STEST3_800_CSF);
3574 }
3575 
3576 /*
3577  * Function : static int print_insn (struct Scsi_Host *host, 
3578  *      unsigned long *insn, int kernel)
3579  *
3580  * Purpose : print numeric representation of the instruction pointed
3581  *      to by insn to the debugging or kernel message buffer
3582  *      as appropriate.  
3583  *
3584  *      If desired, a user level program can interpret this 
3585  *      information.
3586  *
3587  * Inputs : host, insn - host, pointer to instruction, prefix - 
3588  *      string to prepend, kernel - use printk instead of debugging buffer.
3589  *
3590  * Returns : size, in longs, of instruction printed.
3591  */
3592 
3593 static int print_insn (struct Scsi_Host *host, unsigned long *insn,
     /*  */
3594     char *prefix, int kernel) {
3595     char buf[80],               /* Temporary buffer and pointer */
3596         *tmp;                   
3597     unsigned char dcmd;         /* dcmd register for *insn */
3598     int size;
3599 
3600     dcmd = (insn[0] >> 24) & 0xff;
3601     sprintf(buf, "%s%08lx : 0x%08lx 0x%08lx", (prefix ? prefix : ""), 
3602         (unsigned long) insn, insn[0], insn[1]);
3603     tmp = buf + strlen(buf);
3604     if ((dcmd & DCMD_TYPE_MASK) == DCMD_TYPE_MMI)  {
3605         sprintf (tmp, " 0x%08lx\n", insn[2]);
3606         size = 3;
3607     } else {
3608         sprintf (tmp, "\n");
3609         size = 2;
3610     }
3611 
3612     if (kernel) 
3613         printk ("%s", buf);
3614 #ifdef NCR_DEBUG
3615     else {
3616         size_t len = strlen(buf);
3617         debugger_kernel_write(host, buf, len);
3618     }
3619 #endif
3620     return size;
3621 }
3622 
3623 /*
3624  * Function : int NCR53c7xx_abort (Scsi_Cmnd *cmd)
3625  * 
3626  * Purpose : Abort an errant SCSI command, doing all necessary
3627  *      cleanup of the issue_queue, running_list, shared Linux/NCR
3628  *      dsa issue and reconnect queues.
3629  *
3630  * Inputs : cmd - command to abort, code - entire result field
3631  *
3632  * Returns : 0 on success, -1 on failure.
3633  */
3634 
3635 int NCR53c7xx_abort (Scsi_Cmnd *cmd) {
     /*  */
3636     struct Scsi_Host *host = cmd->host;
3637     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *) 
3638         host->hostdata;
3639     int old_level;
3640     struct NCR53c7x0_cmd *curr, **prev;
3641     old_level = splx(0);
3642 
3643 /*
3644  * The command could be hiding in the issue_queue.  This would be very
3645  * nice, as commands can't be moved from the high level driver's issue queue 
3646  * into the shared queue until an interrupt routine is serviced, and this
3647  * moving is atomic.  
3648  *
3649  * If this is the case, we don't have to worry about anything - we simply
3650  * pull the command out of the old queue, and call it aborted.
3651  */
3652 
3653     for (curr = hostdata->issue_queue, prev = &(hostdata->issue_queue);
3654         curr && curr->cmd != cmd; prev = &(curr->next), curr = curr->next);
3655 
3656     if (curr) {
3657         *prev = curr->next;
3658 /* XXX - get rid of DLL ? */
3659         if (curr->prev)
3660             curr->prev->next = curr->next;
3661 
3662         if (!scan_scsis_buf_busy) {
3663 #ifdef SCSI_MALLOC
3664             scsi_free ((void *) curr->real, curr->size);
3665 #else
3666             kfree_s ((void *) curr->real, curr->size);
3667 #endif
3668         } else {
3669             scan_scsis_buf_busy = 0;
3670         }
3671 
3672         cmd->result = 0;
3673         cmd->scsi_done(cmd);
3674         splx(old_level);
3675         return SCSI_ABORT_SUCCESS;
3676     }
3677 
3678 /* 
3679  * That failing, the command could be in our list of already executing 
3680  * commands.  If this is the case, drastic measures are called for.  
3681  */ 
3682 
3683     for (curr = hostdata->running_list, prev = &(hostdata->running_list);
3684         curr && curr->cmd != cmd; prev = &(curr->next), curr = curr->next);
3685 
3686     if (curr) {
3687         splx(old_level);
3688         printk ("scsi%d : DANGER : command in running list, can not abort.\n",
3689             cmd->host->host_no);
3690         return SCSI_ABORT_SNOOZE;
3691     }
3692 
3693 
3694 /* 
3695  * And if we couldn't find it in any of our queues, it must have been 
3696  * a dropped interrupt.
3697  */
3698 
3699     curr = (struct NCR53c7x0_cmd *) cmd->host_scribble;
3700 
3701     if (!scan_scsis_buf_busy) {
3702 #ifdef SCSI_MALLOC
3703         scsi_free ((void *) curr->real, curr->size);
3704 #else
3705         kfree_s ((void *) curr->real, curr->size);
3706 #endif
3707     } else {
3708         scan_scsis_buf_busy = 0;
3709     }
3710 
3711     if (((cmd->result & 0xff00) == 0xff00) ||
3712         ((cmd->result & 0xff) == 0xff)) {
3713         printk ("scsi%d : did this command ever run?\n", host->host_no);
3714     } else {
3715         printk ("scsi%d : probably lost INTFLY, normal completion\n", 
3716             host->host_no);
3717     }
3718     cmd->scsi_done(cmd);
3719     splx(old_level);
3720     return SCSI_ABORT_SNOOZE;
3721 }
3722 
3723 /*
3724  * Function : int NCR53c7xx_reset (Scsi_Cmnd *cmd) 
3725  * 
3726  * Purpose : perform a hard reset of the SCSI bus and NCR
3727  *      chip.
3728  *
3729  * Inputs : cmd - command which caused the SCSI RESET
3730  *
3731  * Returns : 0 on success.
3732  */
3733  
3734 int NCR53c7xx_reset (Scsi_Cmnd *cmd) {
     /*  */
3735     NCR53c7x0_local_declare();
3736     struct Scsi_Host *host = cmd ? cmd->host : NULL;
3737     struct NCR53c7x0_hostdata *hostdata = host ? 
3738         (struct NCR53c7x0_hostdata *) host->hostdata : NULL;
3739     if (host) NCR53c7x0_local_setup(host);
3740     
3741 
3742     printk ("scsi%d : DANGER : NCR53c7xx_reset is NOP\n",
3743         cmd->host->host_no);
3744     return SCSI_RESET_SNOOZE;
3745 }
3746 
3747 /*
3748  * The NCR SDMS bios follows Annex A of the SCSI-CAM draft, and 
3749  * therefore shares the scsicam_bios_param function.
3750  */
3751 
3752 static void print_dsa (struct Scsi_Host *host, unsigned long *dsa) {
     /*  */
3753     struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
3754         host->hostdata;
3755     Scsi_Cmnd * cmd;
3756     struct NCR53c7x0_cmd * c;
3757     int i, len;
3758     char *ptr;
3759 
3760     printk("scsi%d : dsa at 0x%x\n"
3761             "        + %d : dsa_msgout length = %d, data = 0x%x\n" ,
3762             host->host_no, (unsigned) dsa, hostdata->dsa_msgout,
3763             dsa[hostdata->dsa_msgout / sizeof(long)],
3764             dsa[hostdata->dsa_msgout / sizeof(long) + 1]);
3765 
3766     for (i = dsa[hostdata->dsa_msgout / sizeof(long)],
3767         ptr = (char *) dsa[hostdata->dsa_msgout / sizeof(long) + 1]; i > 0;
3768         ptr += len, i -= len) {
3769         printk("               ");
3770         len = print_msg (ptr);
3771         printk("\n");
3772     }
3773 }
3774
/* */
root/drivers/scsi/53c7,8xx.c

DEFINITIONS
