linux/drivers/scsi/sun3_NCR5380.c
<<
>>
Prefs
   1/* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by 
   2   Sam Creasey. */ 
   3/* 
   4 * NCR 5380 generic driver routines.  These should make it *trivial*
   5 *      to implement 5380 SCSI drivers under Linux with a non-trantor
   6 *      architecture.
   7 *
   8 *      Note that these routines also work with NR53c400 family chips.
   9 *
  10 * Copyright 1993, Drew Eckhardt
  11 *      Visionary Computing 
  12 *      (Unix and Linux consulting and custom programming)
  13 *      drew@colorado.edu
  14 *      +1 (303) 666-5836
  15 *
  16 * DISTRIBUTION RELEASE 6. 
  17 *
  18 * For more information, please consult 
  19 *
  20 * NCR 5380 Family
  21 * SCSI Protocol Controller
  22 * Databook
  23 *
  24 * NCR Microelectronics
  25 * 1635 Aeroplaza Drive
  26 * Colorado Springs, CO 80916
  27 * 1+ (719) 578-3400
  28 * 1+ (800) 334-5454
  29 */
  30
  31/*
  32 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
  33 * this file, too:
  34 *
  35 *  - Some of the debug statements were incorrect (undefined variables and the
  36 *    like). I fixed that.
  37 *
  38 *  - In information_transfer(), I think a #ifdef was wrong. Looking at the
  39 *    possible DMA transfer size should also happen for REAL_DMA. I added this
  40 *    in the #if statement.
  41 *
  42 *  - When using real DMA, information_transfer() should return in a DATAOUT
  43 *    phase after starting the DMA. It has nothing more to do.
  44 *
  45 *  - The interrupt service routine should run main after end of DMA, too (not
  46 *    only after RESELECTION interrupts). Additionally, it should _not_ test
  47 *    for more interrupts after running main, since a DMA process may have
  48 *    been started and interrupts are turned on now. The new int could happen
  49 *    inside the execution of NCR5380_intr(), leading to recursive
  50 *    calls.
  51 *
  52 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
  53 *    and USLEEP, because these were messing up readability and will never be
  54 *    needed for Atari SCSI.
  55 * 
  56 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
  57 *   stuff), and 'main' is executed in a bottom half if awoken by an
  58 *   interrupt.
  59 *
  60 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
  61 *   constructs. In my eyes, this made the source rather unreadable, so I
  62 *   finally replaced that by the *_PRINTK() macros.
  63 *
  64 */
  65#include <scsi/scsi_dbg.h>
  66#include <scsi/scsi_transport_spi.h>
  67
  68/*
  69 * Further development / testing that should be done : 
  70 * 1.  Test linked command handling code after Eric is ready with 
  71 *     the high level code.
  72 */
  73
  74#if (NDEBUG & NDEBUG_LISTS)
  75#define LIST(x,y) \
  76  { printk("LINE:%d   Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \
  77    if ((x)==(y)) udelay(5); }
  78#define REMOVE(w,x,y,z) \
  79  { printk("LINE:%d   Removing: %p->%p  %p->%p \n", __LINE__, \
  80           (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \
  81    if ((x)==(y)) udelay(5); }
  82#else
  83#define LIST(x,y)
  84#define REMOVE(w,x,y,z)
  85#endif
  86
  87#ifndef notyet
  88#undef LINKED
  89#endif
  90
  91/*
  92 * Design
  93 * Issues :
  94 *
  95 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
  96 * and specifically for each board rather than each chip.  This makes their
  97 * adaptation to platforms like the Mac (Some of which use NCR5380's)
  98 * more difficult than it has to be.
  99 *
 100 * Also, many of the SCSI drivers were written before the command queuing
 101 * routines were implemented, meaning their implementations of queued 
 102 * commands were hacked on rather than designed in from the start.
 103 *
 104 * When I designed the Linux SCSI drivers I figured that 
 105 * while having two different SCSI boards in a system might be useful
 106 * for debugging things, two of the same type wouldn't be used.
 107 * Well, I was wrong and a number of users have mailed me about running
 108 * multiple high-performance SCSI boards in a server.
 109 *
 110 * Finally, when I get questions from users, I have no idea what 
 111 * revision of my driver they are running.
 112 *
 113 * This driver attempts to address these problems :
 114 * This is a generic 5380 driver.  To use it on a different platform, 
 115 * one simply writes appropriate system specific macros (ie, data
 116 * transfer - some PC's will use the I/O bus, 68K's must use 
 117 * memory mapped) and drops this file in their 'C' wrapper.
 118 *
 119 * As far as command queueing, two queues are maintained for 
 120 * each 5380 in the system - commands that haven't been issued yet,
 121 * and commands that are currently executing.  This means that an 
 122 * unlimited number of commands may be queued, letting 
 123 * more commands propagate from the higher driver levels giving higher 
 124 * throughput.  Note that both I_T_L and I_T_L_Q nexuses are supported, 
 125 * allowing multiple commands to propagate all the way to a SCSI-II device 
 126 * while a command is already executing.
 127 *
 128 * To solve the multiple-boards-in-the-same-system problem, 
 129 * there is a separate instance structure for each instance
 130 * of a 5380 in the system.  So, multiple NCR5380 drivers will
 131 * be able to coexist with appropriate changes to the high level
 132 * SCSI code.  
 133 *
 134 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
 135 * number (updated for each public release) printed by the 
 136 * NCR5380_print_options command, which should be called from the 
 137 * wrapper detect function, so that I know what release of the driver
 138 * users are using.
 139 *
 140 * Issues specific to the NCR5380 : 
 141 *
 142 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead 
 143 * piece of hardware that requires you to sit in a loop polling for 
 144 * the REQ signal as long as you are connected.  Some devices are 
 145 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect 
 146 * while doing long seek operations.
 147 * 
 148 * The workaround for this is to keep track of devices that have
 149 * disconnected.  If the device hasn't disconnected, for commands that
 150 * should disconnect, we do something like 
 151 *
 152 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
 153 * 
 154 * Some tweaking of N and M needs to be done.  An algorithm based 
 155 * on "time to data" would give the best results as long as short time
 156 * to datas (ie, on the same track) were considered, however these 
 157 * broken devices are the exception rather than the rule and I'd rather
 158 * spend my time optimizing for the normal case.
 159 *
 160 * Architecture :
 161 *
 162 * At the heart of the design is a coroutine, NCR5380_main,
 163 * which is started when not running by the interrupt handler,
 164 * timer, and queue command function.  It attempts to establish
 165 * I_T_L or I_T_L_Q nexuses by removing the commands from the 
 166 * issue queue and calling NCR5380_select() if a nexus 
 167 * is not established. 
 168 *
 169 * Once a nexus is established, the NCR5380_information_transfer()
 170 * phase goes through the various phases as instructed by the target.
 171 * if the target goes into MSG IN and sends a DISCONNECT message,
 172 * the command structure is placed into the per instance disconnected
 173 * queue, and NCR5380_main tries to find more work.  If USLEEP
 174 * was defined, and the target is idle for too long, the system
 175 * will try to sleep.
 176 *
 177 * If a command has disconnected, eventually an interrupt will trigger,
 178 * calling NCR5380_intr()  which will in turn call NCR5380_reselect
 179 * to reestablish a nexus.  This will run main if necessary.
 180 *
 181 * On command termination, the done function will be called as 
 182 * appropriate.
 183 *
 184 * SCSI pointers are maintained in the SCp field of SCSI command 
 185 * structures, being initialized after the command is connected
 186 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
 187 * Note that in violation of the standard, an implicit SAVE POINTERS operation
 188 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
 189 */
 190
 191/*
 192 * Using this file :
 193 * This file a skeleton Linux SCSI driver for the NCR 5380 series
 194 * of chips.  To use it, you write an architecture specific functions 
 195 * and macros and include this file in your driver.
 196 *
 197 * These macros control options : 
 198 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
 199 *      for commands that return with a CHECK CONDITION status. 
 200 *
 201 * LINKED - if defined, linked commands are supported.
 202 *
 203 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
 204 *
 205 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
 206 *
 207 * These macros MUST be defined :
 208 * 
 209 * NCR5380_read(register)  - read from the specified register
 210 *
 211 * NCR5380_write(register, value) - write to the specific register 
 212 *
 213 * Either real DMA *or* pseudo DMA may be implemented
 214 * REAL functions : 
 215 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
 216 * Note that the DMA setup functions should return the number of bytes 
 217 *      that they were able to program the controller for.
 218 *
 219 * Also note that generic i386/PC versions of these macros are 
 220 *      available as NCR5380_i386_dma_write_setup,
 221 *      NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
 222 *
 223 * NCR5380_dma_write_setup(instance, src, count) - initialize
 224 * NCR5380_dma_read_setup(instance, dst, count) - initialize
 225 * NCR5380_dma_residual(instance); - residual count
 226 *
 227 * PSEUDO functions :
 228 * NCR5380_pwrite(instance, src, count)
 229 * NCR5380_pread(instance, dst, count);
 230 *
 231 * If nothing specific to this implementation needs doing (ie, with external
 232 * hardware), you must also define 
 233 *  
 234 * NCR5380_queue_command
 235 * NCR5380_reset
 236 * NCR5380_abort
 237 * NCR5380_proc_info
 238 *
 239 * to be the global entry points into the specific driver, ie 
 240 * #define NCR5380_queue_command t128_queue_command.
 241 *
 242 * If this is not done, the routines will be defined as static functions
 243 * with the NCR5380* names and the user must provide a globally
 244 * accessible wrapper function.
 245 *
 246 * The generic driver is initialized by calling NCR5380_init(instance),
 247 * after setting the appropriate host specific fields and ID.  If the 
 248 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
 249 * possible) function may be used.  Before the specific driver initialization
 250 * code finishes, NCR5380_print_options should be called.
 251 */
 252
 253static struct Scsi_Host *first_instance = NULL;
 254static struct scsi_host_template *the_template = NULL;
 255
 256/* Macros ease life... :-) */
 257#define SETUP_HOSTDATA(in)                              \
 258    struct NCR5380_hostdata *hostdata =                 \
 259        (struct NCR5380_hostdata *)(in)->hostdata
 260#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
 261
 262#define NEXT(cmd)               ((struct scsi_cmnd *)(cmd)->host_scribble)
 263#define SET_NEXT(cmd, next)     ((cmd)->host_scribble = (void *)(next))
 264#define NEXTADDR(cmd)           ((struct scsi_cmnd **)&((cmd)->host_scribble))
 265
 266#define HOSTNO          instance->host_no
 267#define H_NO(cmd)       (cmd)->device->host->host_no
 268
 269#define SGADDR(buffer) (void *)(((unsigned long)sg_virt(((buffer)))))
 270
 271#ifdef SUPPORT_TAGS
 272
 273/*
 274 * Functions for handling tagged queuing
 275 * =====================================
 276 *
 277 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
 278 *
 279 * Using consecutive numbers for the tags is no good idea in my eyes. There
 280 * could be wrong re-usings if the counter (8 bit!) wraps and some early
 281 * command has been preempted for a long time. My solution: a bitfield for
 282 * remembering used tags.
 283 *
 284 * There's also the problem that each target has a certain queue size, but we
 285 * cannot know it in advance :-( We just see a QUEUE_FULL status being
 286 * returned. So, in this case, the driver internal queue size assumption is
 287 * reduced to the number of active tags if QUEUE_FULL is returned by the
 288 * target. The command is returned to the mid-level, but with status changed
 289 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
 290 * correctly.
 291 *
 292 * We're also not allowed running tagged commands as long as an untagged
 293 * command is active. And REQUEST SENSE commands after a contingent allegiance
 294 * condition _must_ be untagged. To keep track whether an untagged command has
 295 * been issued, the host->busy array is still employed, as it is without
 296 * support for tagged queuing.
 297 *
 298 * One could suspect that there are possible race conditions between
 299 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
 300 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
 301 * which already guaranteed to be running at most once. It is also the only
 302 * place where tags/LUNs are allocated. So no other allocation can slip
 303 * between that pair, there could only happen a reselection, which can free a
 304 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
 305 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
 306 */
 307
 308/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
 309#undef TAG_NONE
 310#define TAG_NONE 0xff
 311
 312/* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */
 313#if (MAX_TAGS % 32) != 0
 314#error "MAX_TAGS must be a multiple of 32!"
 315#endif
 316
 317typedef struct {
 318    char        allocated[MAX_TAGS/8];
 319    int         nr_allocated;
 320    int         queue_size;
 321} TAG_ALLOC;
 322
 323static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
 324
 325
 326static void __init init_tags( void )
 327{
 328    int target, lun;
 329    TAG_ALLOC *ta;
 330    
 331    if (!setup_use_tagged_queuing)
 332        return;
 333    
 334    for( target = 0; target < 8; ++target ) {
 335        for( lun = 0; lun < 8; ++lun ) {
 336            ta = &TagAlloc[target][lun];
 337            memset( &ta->allocated, 0, MAX_TAGS/8 );
 338            ta->nr_allocated = 0;
 339            /* At the beginning, assume the maximum queue size we could
 340             * support (MAX_TAGS). This value will be decreased if the target
 341             * returns QUEUE_FULL status.
 342             */
 343            ta->queue_size = MAX_TAGS;
 344        }
 345    }
 346}
 347
 348
 349/* Check if we can issue a command to this LUN: First see if the LUN is marked
 350 * busy by an untagged command. If the command should use tagged queuing, also
 351 * check that there is a free tag and the target's queue won't overflow. This
 352 * function should be called with interrupts disabled to avoid race
 353 * conditions.
 354 */ 
 355
 356static int is_lun_busy(struct scsi_cmnd *cmd, int should_be_tagged)
 357{
 358    SETUP_HOSTDATA(cmd->device->host);
 359
 360    if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
 361        return( 1 );
 362    if (!should_be_tagged ||
 363        !setup_use_tagged_queuing || !cmd->device->tagged_supported)
 364        return( 0 );
 365    if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
 366        TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) {
 367        TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n",
 368                    H_NO(cmd), cmd->device->id, cmd->device->lun );
 369        return( 1 );
 370    }
 371    return( 0 );
 372}
 373
 374
 375/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
 376 * must be called before!), or reserve the LUN in 'busy' if the command is
 377 * untagged.
 378 */
 379
 380static void cmd_get_tag(struct scsi_cmnd *cmd, int should_be_tagged)
 381{
 382    SETUP_HOSTDATA(cmd->device->host);
 383
 384    /* If we or the target don't support tagged queuing, allocate the LUN for
 385     * an untagged command.
 386     */
 387    if (!should_be_tagged ||
 388        !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
 389        cmd->tag = TAG_NONE;
 390        hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
 391        TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged "
 392                    "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun );
 393    }
 394    else {
 395        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
 396
 397        cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS );
 398        set_bit( cmd->tag, &ta->allocated );
 399        ta->nr_allocated++;
 400        TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d "
 401                    "(now %d tags in use)\n",
 402                    H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun,
 403                    ta->nr_allocated );
 404    }
 405}
 406
 407
 408/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
 409 * unlock the LUN.
 410 */
 411
 412static void cmd_free_tag(struct scsi_cmnd *cmd)
 413{
 414    SETUP_HOSTDATA(cmd->device->host);
 415
 416    if (cmd->tag == TAG_NONE) {
 417        hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
 418        TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n",
 419                    H_NO(cmd), cmd->device->id, cmd->device->lun );
 420    }
 421    else if (cmd->tag >= MAX_TAGS) {
 422        printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
 423                H_NO(cmd), cmd->tag );
 424    }
 425    else {
 426        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
 427        clear_bit( cmd->tag, &ta->allocated );
 428        ta->nr_allocated--;
 429        TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n",
 430                    H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun );
 431    }
 432}
 433
 434
 435static void free_all_tags( void )
 436{
 437    int target, lun;
 438    TAG_ALLOC *ta;
 439
 440    if (!setup_use_tagged_queuing)
 441        return;
 442    
 443    for( target = 0; target < 8; ++target ) {
 444        for( lun = 0; lun < 8; ++lun ) {
 445            ta = &TagAlloc[target][lun];
 446            memset( &ta->allocated, 0, MAX_TAGS/8 );
 447            ta->nr_allocated = 0;
 448        }
 449    }
 450}
 451
 452#endif /* SUPPORT_TAGS */
 453
 454
 455/*
 456 * Function : void initialize_SCp(struct scsi_cmnd *cmd)
 457 *
 458 * Purpose : initialize the saved data pointers for cmd to point to the 
 459 *      start of the buffer.
 460 *
 461 * Inputs : cmd - struct scsi_cmnd structure to have pointers reset.
 462 */
 463
 464static __inline__ void initialize_SCp(struct scsi_cmnd *cmd)
 465{
 466    /* 
 467     * Initialize the Scsi Pointer field so that all of the commands in the 
 468     * various queues are valid.
 469     */
 470
 471    if (scsi_bufflen(cmd)) {
 472        cmd->SCp.buffer = scsi_sglist(cmd);
 473        cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
 474        cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer);
 475        cmd->SCp.this_residual = cmd->SCp.buffer->length;
 476    } else {
 477        cmd->SCp.buffer = NULL;
 478        cmd->SCp.buffers_residual = 0;
 479        cmd->SCp.ptr = NULL;
 480        cmd->SCp.this_residual = 0;
 481    }
 482    
 483}
 484
 485#include <linux/delay.h>
 486
 487#if 1
 488static struct {
 489    unsigned char mask;
 490    const char * name;} 
 491signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, 
 492    { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD,  "CD" }, { SR_IO, "IO" }, 
 493    { SR_SEL, "SEL" }, {0, NULL}}, 
 494basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
 495icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
 496    {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, 
 497    {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, 
 498    {0, NULL}},
 499mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, 
 500    {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, 
 501    "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
 502    {MR_MONITOR_BSY, "MODE MONITOR BSY"},
 503    {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, 
 504    {0, NULL}};
 505
 506/*
 507 * Function : void NCR5380_print(struct Scsi_Host *instance)
 508 *
 509 * Purpose : print the SCSI bus signals for debugging purposes
 510 *
 511 * Input : instance - which NCR5380
 512 */
 513
 514static void NCR5380_print(struct Scsi_Host *instance) {
 515    unsigned char status, data, basr, mr, icr, i;
 516    unsigned long flags;
 517
 518    local_irq_save(flags);
 519    data = NCR5380_read(CURRENT_SCSI_DATA_REG);
 520    status = NCR5380_read(STATUS_REG);
 521    mr = NCR5380_read(MODE_REG);
 522    icr = NCR5380_read(INITIATOR_COMMAND_REG);
 523    basr = NCR5380_read(BUS_AND_STATUS_REG);
 524    local_irq_restore(flags);
 525    printk("STATUS_REG: %02x ", status);
 526    for (i = 0; signals[i].mask ; ++i) 
 527        if (status & signals[i].mask)
 528            printk(",%s", signals[i].name);
 529    printk("\nBASR: %02x ", basr);
 530    for (i = 0; basrs[i].mask ; ++i) 
 531        if (basr & basrs[i].mask)
 532            printk(",%s", basrs[i].name);
 533    printk("\nICR: %02x ", icr);
 534    for (i = 0; icrs[i].mask; ++i) 
 535        if (icr & icrs[i].mask)
 536            printk(",%s", icrs[i].name);
 537    printk("\nMODE: %02x ", mr);
 538    for (i = 0; mrs[i].mask; ++i) 
 539        if (mr & mrs[i].mask)
 540            printk(",%s", mrs[i].name);
 541    printk("\n");
 542}
 543
 544static struct {
 545    unsigned char value;
 546    const char *name;
 547} phases[] = {
 548    {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
 549    {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
 550    {PHASE_UNKNOWN, "UNKNOWN"}};
 551
 552/* 
 553 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
 554 *
 555 * Purpose : print the current SCSI phase for debugging purposes
 556 *
 557 * Input : instance - which NCR5380
 558 */
 559
 560static void NCR5380_print_phase(struct Scsi_Host *instance)
 561{
 562    unsigned char status;
 563    int i;
 564
 565    status = NCR5380_read(STATUS_REG);
 566    if (!(status & SR_REQ)) 
 567        printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
 568    else {
 569        for (i = 0; (phases[i].value != PHASE_UNKNOWN) && 
 570            (phases[i].value != (status & PHASE_MASK)); ++i); 
 571        printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
 572    }
 573}
 574
 575#else /* !NDEBUG */
 576
 577/* dummies... */
 578__inline__ void NCR5380_print(struct Scsi_Host *instance) { };
 579__inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { };
 580
 581#endif
 582
 583/*
 584 * ++roman: New scheme of calling NCR5380_main()
 585 * 
 586 * If we're not in an interrupt, we can call our main directly, it cannot be
 587 * already running. Else, we queue it on a task queue, if not 'main_running'
 588 * tells us that a lower level is already executing it. This way,
 589 * 'main_running' needs not be protected in a special way.
 590 *
 591 * queue_main() is a utility function for putting our main onto the task
 592 * queue, if main_running is false. It should be called only from a
 593 * interrupt or bottom half.
 594 */
 595
 596#include <linux/gfp.h>
 597#include <linux/workqueue.h>
 598#include <linux/interrupt.h>
 599
 600static volatile int main_running = 0;
 601static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
 602
 603static __inline__ void queue_main(void)
 604{
 605    if (!main_running) {
 606        /* If in interrupt and NCR5380_main() not already running,
 607           queue it on the 'immediate' task queue, to be processed
 608           immediately after the current interrupt processing has
 609           finished. */
 610        schedule_work(&NCR5380_tqueue);
 611    }
 612    /* else: nothing to do: the running NCR5380_main() will pick up
 613       any newly queued command. */
 614}
 615
 616
 617static inline void NCR5380_all_init (void)
 618{
 619    static int done = 0;
 620    if (!done) {
 621        INI_PRINTK("scsi : NCR5380_all_init()\n");
 622        done = 1;
 623    }
 624}
 625
 626 
 627/*
 628 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
 629 *
 630 * Purpose : called by probe code indicating the NCR5380 driver
 631 *           options that were selected.
 632 *
 633 * Inputs : instance, pointer to this instance.  Unused.
 634 */
 635
 636static void __init NCR5380_print_options (struct Scsi_Host *instance)
 637{
 638    printk(" generic options"
 639#ifdef AUTOSENSE 
 640    " AUTOSENSE"
 641#endif
 642#ifdef REAL_DMA
 643    " REAL DMA"
 644#endif
 645#ifdef PARITY
 646    " PARITY"
 647#endif
 648#ifdef SUPPORT_TAGS
 649    " SCSI-2 TAGGED QUEUING"
 650#endif
 651    );
 652    printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
 653}
 654
 655/*
 656 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
 657 *
 658 * Purpose : print commands in the various queues, called from
 659 *      NCR5380_abort and NCR5380_debug to aid debugging.
 660 *
 661 * Inputs : instance, pointer to this instance.  
 662 */
 663
 664static void NCR5380_print_status (struct Scsi_Host *instance)
 665{
 666    char *pr_bfr;
 667    char *start;
 668    int len;
 669
 670    NCR_PRINT(NDEBUG_ANY);
 671    NCR_PRINT_PHASE(NDEBUG_ANY);
 672
 673    pr_bfr = (char *) __get_free_page(GFP_ATOMIC);
 674    if (!pr_bfr) {
 675        printk("NCR5380_print_status: no memory for print buffer\n");
 676        return;
 677    }
 678    len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
 679    pr_bfr[len] = 0;
 680    printk("\n%s\n", pr_bfr);
 681    free_page((unsigned long) pr_bfr);
 682}
 683
 684
 685/******************************************/
 686/*
 687 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
 688 *
 689 * *buffer: I/O buffer
 690 * **start: if inout == FALSE pointer into buffer where user read should start
 691 * offset: current offset
 692 * length: length of buffer
 693 * hostno: Scsi_Host host_no
 694 * inout: TRUE - user is writing; FALSE - user is reading
 695 *
 696 * Return the number of bytes read from or written
 697*/
 698
 699#undef SPRINTF
 700#define SPRINTF(fmt,args...) \
 701  do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
 702         pos += sprintf(pos, fmt , ## args); } while(0)
 703static
 704char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
 705                       int length);
 706
 707static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
 708                             char **start, off_t offset, int length, int inout)
 709{
 710    char *pos = buffer;
 711    struct NCR5380_hostdata *hostdata;
 712    struct scsi_cmnd *ptr;
 713    unsigned long flags;
 714    off_t begin = 0;
 715#define check_offset()                          \
 716    do {                                        \
 717        if (pos - buffer < offset - begin) {    \
 718            begin += pos - buffer;              \
 719            pos = buffer;                       \
 720        }                                       \
 721    } while (0)
 722
 723    hostdata = (struct NCR5380_hostdata *)instance->hostdata;
 724
 725    if (inout) { /* Has data been written to the file ? */
 726        return(-ENOSYS);  /* Currently this is a no-op */
 727    }
 728    SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
 729    check_offset();
 730    local_irq_save(flags);
 731    SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't");
 732    check_offset();
 733    if (!hostdata->connected)
 734        SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
 735    else
 736        pos = lprint_Scsi_Cmnd ((struct scsi_cmnd *) hostdata->connected,
 737                                pos, buffer, length);
 738    SPRINTF("scsi%d: issue_queue\n", HOSTNO);
 739    check_offset();
 740    for (ptr = (struct scsi_cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr))
 741    {
 742        pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
 743        check_offset();
 744    }
 745
 746    SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
 747    check_offset();
 748    for (ptr = (struct scsi_cmnd *) hostdata->disconnected_queue; ptr;
 749         ptr = NEXT(ptr)) {
 750        pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
 751        check_offset();
 752    }
 753
 754    local_irq_restore(flags);
 755    *start = buffer + (offset - begin);
 756    if (pos - buffer < offset - begin)
 757        return 0;
 758    else if (pos - buffer - (offset - begin) < length)
 759        return pos - buffer - (offset - begin);
 760    return length;
 761}
 762
 763static char *lprint_Scsi_Cmnd(struct scsi_cmnd *cmd, char *pos, char *buffer,
 764                              int length)
 765{
 766    int i, s;
 767    unsigned char *command;
 768    SPRINTF("scsi%d: destination target %d, lun %d\n",
 769            H_NO(cmd), cmd->device->id, cmd->device->lun);
 770    SPRINTF("        command = ");
 771    command = cmd->cmnd;
 772    SPRINTF("%2d (0x%02x)", command[0], command[0]);
 773    for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
 774        SPRINTF(" %02x", command[i]);
 775    SPRINTF("\n");
 776    return pos;
 777}
 778
 779
 780/* 
 781 * Function : void NCR5380_init (struct Scsi_Host *instance)
 782 *
 783 * Purpose : initializes *instance and corresponding 5380 chip.
 784 *
 785 * Inputs : instance - instantiation of the 5380 driver.  
 786 *
 787 * Notes : I assume that the host, hostno, and id bits have been
 788 *      set correctly.  I don't care about the irq and other fields. 
 789 * 
 790 */
 791
 792static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
 793{
 794    int i;
 795    SETUP_HOSTDATA(instance);
 796
 797    NCR5380_all_init();
 798
 799    hostdata->aborted = 0;
 800    hostdata->id_mask = 1 << instance->this_id;
 801    hostdata->id_higher_mask = 0;
 802    for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
 803        if (i > hostdata->id_mask)
 804            hostdata->id_higher_mask |= i;
 805    for (i = 0; i < 8; ++i)
 806        hostdata->busy[i] = 0;
 807#ifdef SUPPORT_TAGS
 808    init_tags();
 809#endif
 810#if defined (REAL_DMA)
 811    hostdata->dma_len = 0;
 812#endif
 813    hostdata->targets_present = 0;
 814    hostdata->connected = NULL;
 815    hostdata->issue_queue = NULL;
 816    hostdata->disconnected_queue = NULL;
 817    hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
 818
 819    if (!the_template) {
 820        the_template = instance->hostt;
 821        first_instance = instance;
 822    }
 823        
 824
 825#ifndef AUTOSENSE
 826    if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
 827         printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
 828                "        without AUTOSENSE option, contingent allegiance conditions may\n"
 829                "        be incorrectly cleared.\n", HOSTNO);
 830#endif /* def AUTOSENSE */
 831
 832    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
 833    NCR5380_write(MODE_REG, MR_BASE);
 834    NCR5380_write(TARGET_COMMAND_REG, 0);
 835    NCR5380_write(SELECT_ENABLE_REG, 0);
 836
 837    return 0;
 838}
 839
 840static void NCR5380_exit(struct Scsi_Host *instance)
 841{
 842        /* Empty, as we didn't schedule any delayed work */
 843}
 844
 845/* 
 846 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
 847 *      void (*done)(struct scsi_cmnd *))
 848 *
 849 * Purpose :  enqueues a SCSI command
 850 *
 851 * Inputs : cmd - SCSI command, done - function called on completion, with
 852 *      a pointer to the command descriptor.
 853 * 
 854 * Returns : 0
 855 *
 856 * Side effects : 
 857 *      cmd is added to the per instance issue_queue, with minor 
 858 *      twiddling done to the host specific fields of cmd.  If the 
 859 *      main coroutine is not running, it is restarted.
 860 *
 861 */
 862
 863/* Only make static if a wrapper function is used */
 864static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd,
 865                                 void (*done)(struct scsi_cmnd *))
 866{
 867    SETUP_HOSTDATA(cmd->device->host);
 868    struct scsi_cmnd *tmp;
 869    unsigned long flags;
 870
 871#if (NDEBUG & NDEBUG_NO_WRITE)
 872    switch (cmd->cmnd[0]) {
 873    case WRITE_6:
 874    case WRITE_10:
 875        printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
 876               H_NO(cmd));
 877        cmd->result = (DID_ERROR << 16);
 878        done(cmd);
 879        return 0;
 880    }
 881#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
 882
 883
 884#ifdef NCR5380_STATS
 885# if 0
 886    if (!hostdata->connected && !hostdata->issue_queue &&
 887        !hostdata->disconnected_queue) {
 888        hostdata->timebase = jiffies;
 889    }
 890# endif
 891# ifdef NCR5380_STAT_LIMIT
 892    if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
 893# endif
 894        switch (cmd->cmnd[0])
 895        {
 896            case WRITE:
 897            case WRITE_6:
 898            case WRITE_10:
 899                hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
 900                hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
 901                hostdata->pendingw++;
 902                break;
 903            case READ:
 904            case READ_6:
 905            case READ_10:
 906                hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
 907                hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
 908                hostdata->pendingr++;
 909                break;
 910        }
 911#endif
 912
 913    /* 
 914     * We use the host_scribble field as a pointer to the next command  
 915     * in a queue 
 916     */
 917
 918    SET_NEXT(cmd, NULL);
 919    cmd->scsi_done = done;
 920
 921    cmd->result = 0;
 922
 923
 924    /* 
 925     * Insert the cmd into the issue queue. Note that REQUEST SENSE 
 926     * commands are added to the head of the queue since any command will
 927     * clear the contingent allegiance condition that exists and the 
 928     * sense data is only guaranteed to be valid while the condition exists.
 929     */
 930
 931    local_irq_save(flags);
 932    /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
 933     * Otherwise a running NCR5380_main may steal the lock.
 934     * Lock before actually inserting due to fairness reasons explained in
 935     * atari_scsi.c. If we insert first, then it's impossible for this driver
 936     * to release the lock.
 937     * Stop timer for this command while waiting for the lock, or timeouts
 938     * may happen (and they really do), and it's no good if the command doesn't
 939     * appear in any of the queues.
 940     * ++roman: Just disabling the NCR interrupt isn't sufficient here,
 941     * because also a timer int can trigger an abort or reset, which would
 942     * alter queues and touch the lock.
 943     */
 944    if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
 945        LIST(cmd, hostdata->issue_queue);
 946        SET_NEXT(cmd, hostdata->issue_queue);
 947        hostdata->issue_queue = cmd;
 948    } else {
 949        for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
 950             NEXT(tmp); tmp = NEXT(tmp))
 951            ;
 952        LIST(cmd, tmp);
 953        SET_NEXT(tmp, cmd);
 954    }
 955
 956    local_irq_restore(flags);
 957
 958    QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
 959              (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
 960
 961    /* If queue_command() is called from an interrupt (real one or bottom
 962     * half), we let queue_main() do the job of taking care about main. If it
 963     * is already running, this is a no-op, else main will be queued.
 964     *
 965     * If we're not in an interrupt, we can call NCR5380_main()
 966     * unconditionally, because it cannot be already running.
 967     */
 968    if (in_interrupt() || ((flags >> 8) & 7) >= 6)
 969        queue_main();
 970    else
 971        NCR5380_main(NULL);
 972    return 0;
 973}
 974
 975static DEF_SCSI_QCMD(NCR5380_queue_command)
 976
 977/*
 978 * Function : NCR5380_main (void) 
 979 *
 980 * Purpose : NCR5380_main is a coroutine that runs as long as more work can 
 981 *      be done on the NCR5380 host adapters in a system.  Both 
 982 *      NCR5380_queue_command() and NCR5380_intr() will try to start it 
 983 *      in case it is not running.
 984 * 
 985 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should 
 986 *  reenable them.  This prevents reentrancy and kernel stack overflow.
 987 */     
 988    
 989static void NCR5380_main (struct work_struct *bl)
 990{
 991    struct scsi_cmnd *tmp, *prev;
 992    struct Scsi_Host *instance = first_instance;
 993    struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
 994    int done;
 995    unsigned long flags;
 996    
 997    /*
 998     * We run (with interrupts disabled) until we're sure that none of 
 999     * the host adapters have anything that can be done, at which point 
1000     * we set main_running to 0 and exit.
1001     *
1002     * Interrupts are enabled before doing various other internal 
1003     * instructions, after we've decided that we need to run through
1004     * the loop again.
1005     *
1006     * this should prevent any race conditions.
1007     * 
1008     * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1009     * because also a timer int can trigger an abort or reset, which can
1010     * alter queues and touch the Falcon lock.
1011     */
1012
1013    /* Tell int handlers main() is now already executing.  Note that
1014       no races are possible here. If an int comes in before
1015       'main_running' is set here, and queues/executes main via the
1016       task queue, it doesn't do any harm, just this instance of main
1017       won't find any work left to do. */
1018    if (main_running)
1019        return;
1020    main_running = 1;
1021
1022    local_save_flags(flags);
1023    do {
1024        local_irq_disable(); /* Freeze request queues */
1025        done = 1;
1026        
1027        if (!hostdata->connected) {
1028            MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1029            /*
1030             * Search through the issue_queue for a command destined
1031             * for a target that's not busy.
1032             */
1033#if (NDEBUG & NDEBUG_LISTS)
1034            for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
1035                 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1036                ;
1037            if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1038#endif
1039            for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
1040                 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1041
1042#if (NDEBUG & NDEBUG_LISTS)
1043                if (prev != tmp)
1044                    printk("MAIN tmp=%p   target=%d   busy=%d lun=%d\n",
1045                           tmp, tmp->target, hostdata->busy[tmp->target],
1046                           tmp->lun);
1047#endif
1048                /*  When we find one, remove it from the issue queue. */
1049                /* ++guenther: possible race with Falcon locking */
1050                if (
1051#ifdef SUPPORT_TAGS
1052                    !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1053#else
1054                    !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1055#endif
1056                    ) {
1057                    /* ++guenther: just to be sure, this must be atomic */
1058                    local_irq_disable();
1059                    if (prev) {
1060                        REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1061                        SET_NEXT(prev, NEXT(tmp));
1062                    } else {
1063                        REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1064                        hostdata->issue_queue = NEXT(tmp);
1065                    }
1066                    SET_NEXT(tmp, NULL);
1067                    
1068                    /* reenable interrupts after finding one */
1069                    local_irq_restore(flags);
1070                    
1071                    /* 
1072                     * Attempt to establish an I_T_L nexus here. 
1073                     * On success, instance->hostdata->connected is set.
1074                     * On failure, we must add the command back to the
1075                     *   issue queue so we can keep trying.     
1076                     */
1077                    MAIN_PRINTK("scsi%d: main(): command for target %d "
1078                                "lun %d removed from issue_queue\n",
1079                                HOSTNO, tmp->target, tmp->lun);
1080                    /* 
1081                     * REQUEST SENSE commands are issued without tagged
1082                     * queueing, even on SCSI-II devices because the 
1083                     * contingent allegiance condition exists for the 
1084                     * entire unit.
1085                     */
1086                    /* ++roman: ...and the standard also requires that
1087                     * REQUEST SENSE command are untagged.
1088                     */
1089                    
1090#ifdef SUPPORT_TAGS
1091                    cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1092#endif
1093                    if (!NCR5380_select(instance, tmp, 
1094                            (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : 
1095                            TAG_NEXT)) {
1096                        break;
1097                    } else {
1098                        local_irq_disable();
1099                        LIST(tmp, hostdata->issue_queue);
1100                        SET_NEXT(tmp, hostdata->issue_queue);
1101                        hostdata->issue_queue = tmp;
1102#ifdef SUPPORT_TAGS
1103                        cmd_free_tag( tmp );
1104#endif
1105                        local_irq_restore(flags);
1106                        MAIN_PRINTK("scsi%d: main(): select() failed, "
1107                                    "returned to issue_queue\n", HOSTNO);
1108                        if (hostdata->connected)
1109                            break;
1110                    }
1111                } /* if target/lun/target queue is not busy */
1112            } /* for issue_queue */
1113        } /* if (!hostdata->connected) */
1114        if (hostdata->connected 
1115#ifdef REAL_DMA
1116            && !hostdata->dma_len
1117#endif
1118            ) {
1119            local_irq_restore(flags);
1120            MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1121                        HOSTNO);
1122            NCR5380_information_transfer(instance);
1123            MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1124            done = 0;
1125        }
1126    } while (!done);
1127
1128    /* Better allow ints _after_ 'main_running' has been cleared, else
1129       an interrupt could believe we'll pick up the work it left for
1130       us, but we won't see it anymore here... */
1131    main_running = 0;
1132    local_irq_restore(flags);
1133}
1134
1135
1136#ifdef REAL_DMA
1137/*
1138 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1139 *
1140 * Purpose : Called by interrupt handler when DMA finishes or a phase
1141 *      mismatch occurs (which would finish the DMA transfer).  
1142 *
1143 * Inputs : instance - this instance of the NCR5380.
1144 *
1145 */
1146
1147static void NCR5380_dma_complete( struct Scsi_Host *instance )
1148{
1149    SETUP_HOSTDATA(instance);
1150    int           transfered;
1151    unsigned char **data;
1152    volatile int  *count;
1153
1154    if (!hostdata->connected) {
1155        printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1156               "no connected cmd\n", HOSTNO);
1157        return;
1158    }
1159
1160    DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1161               HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1162               NCR5380_read(STATUS_REG));
1163
1164    if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1165            printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1166            printk("please e-mail sammy@sammy.net with a description of how this\n");
1167            printk("error was produced.\n");
1168            BUG();
1169    }
1170
1171    /* make sure we're not stuck in a data phase */
1172    if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1173                                            BASR_ACK)) ==
1174       (BASR_PHASE_MATCH | BASR_ACK)) {
1175            printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1176            printk("scsi%d: bus stuck in data phase -- probably a single byte "
1177                   "overrun!\n", HOSTNO);
1178            printk("not prepared for this error!\n");
1179            printk("please e-mail sammy@sammy.net with a description of how this\n");
1180            printk("error was produced.\n");
1181            BUG();
1182    }
1183
1184
1185
1186    (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1187    NCR5380_write(MODE_REG, MR_BASE);
1188    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1189
1190    transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1191    hostdata->dma_len = 0;
1192
1193    data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1194    count = &(hostdata->connected->SCp.this_residual);
1195    *data += transfered;
1196    *count -= transfered;
1197
1198}
1199#endif /* REAL_DMA */
1200
1201
1202/*
1203 * Function : void NCR5380_intr (int irq)
1204 * 
1205 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1206 *      from the disconnected queue, and restarting NCR5380_main() 
1207 *      as required.
1208 *
1209 * Inputs : int irq, irq that caused this interrupt.
1210 *
1211 */
1212
1213static irqreturn_t NCR5380_intr (int irq, void *dev_id)
1214{
1215    struct Scsi_Host *instance = first_instance;
1216    int done = 1, handled = 0;
1217    unsigned char basr;
1218
1219    INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1220
1221    /* Look for pending interrupts */
1222    basr = NCR5380_read(BUS_AND_STATUS_REG);
1223    INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1224    /* dispatch to appropriate routine if found and done=0 */
1225    if (basr & BASR_IRQ) {
1226        NCR_PRINT(NDEBUG_INTR);
1227        if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1228            done = 0;
1229//          ENABLE_IRQ();
1230            INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1231            NCR5380_reselect(instance);
1232            (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1233        }
1234        else if (basr & BASR_PARITY_ERROR) {
1235            INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1236            (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1237        }
1238        else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1239            INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1240            (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1241        }
1242        else {
1243            /*  
1244             * The rest of the interrupt conditions can occur only during a
1245             * DMA transfer
1246             */
1247
1248#if defined(REAL_DMA)
1249            /*
1250             * We should only get PHASE MISMATCH and EOP interrupts if we have
1251             * DMA enabled, so do a sanity check based on the current setting
1252             * of the MODE register.
1253             */
1254
1255            if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1256                ((basr & BASR_END_DMA_TRANSFER) || 
1257                 !(basr & BASR_PHASE_MATCH))) {
1258                    
1259                INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1260                NCR5380_dma_complete( instance );
1261                done = 0;
1262//              ENABLE_IRQ();
1263            } else
1264#endif /* REAL_DMA */
1265            {
1266/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1267                if (basr & BASR_PHASE_MATCH)
1268                   INT_PRINTK("scsi%d: unknown interrupt, "
1269                           "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1270                           HOSTNO, basr, NCR5380_read(MODE_REG),
1271                           NCR5380_read(STATUS_REG));
1272                (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1273#ifdef SUN3_SCSI_VME
1274                dregs->csr |= CSR_DMA_ENABLE;
1275#endif
1276            }
1277        } /* if !(SELECTION || PARITY) */
1278        handled = 1;
1279    } /* BASR & IRQ */
1280    else {
1281
1282        printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1283               "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1284               NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1285        (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1286#ifdef SUN3_SCSI_VME
1287                dregs->csr |= CSR_DMA_ENABLE;
1288#endif
1289    }
1290    
1291    if (!done) {
1292        INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1293        /* Put a call to NCR5380_main() on the queue... */
1294        queue_main();
1295    }
1296    return IRQ_RETVAL(handled);
1297}
1298
1299#ifdef NCR5380_STATS
1300static void collect_stats(struct NCR5380_hostdata *hostdata,
1301                          struct scsi_cmnd *cmd)
1302{
1303# ifdef NCR5380_STAT_LIMIT
1304    if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
1305# endif
1306        switch (cmd->cmnd[0])
1307        {
1308            case WRITE:
1309            case WRITE_6:
1310            case WRITE_10:
1311                hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1312                /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
1313                hostdata->pendingw--;
1314                break;
1315            case READ:
1316            case READ_6:
1317            case READ_10:
1318                hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1319                /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
1320                hostdata->pendingr--;
1321                break;
1322        }
1323}
1324#endif
1325
1326/* 
1327 * Function : int NCR5380_select(struct Scsi_Host *instance,
1328 *                               struct scsi_cmnd *cmd, int tag);
1329 *
1330 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1331 *      including ARBITRATION, SELECTION, and initial message out for 
1332 *      IDENTIFY and queue messages. 
1333 *
1334 * Inputs : instance - instantiation of the 5380 driver on which this 
1335 *      target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 
1336 *      new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 
1337 *      the command that is presently connected.
1338 * 
1339 * Returns : -1 if selection could not execute for some reason,
1340 *      0 if selection succeeded or failed because the target 
1341 *      did not respond.
1342 *
1343 * Side effects : 
1344 *      If bus busy, arbitration failed, etc, NCR5380_select() will exit 
1345 *              with registers as they should have been on entry - ie
1346 *              SELECT_ENABLE will be set appropriately, the NCR5380
1347 *              will cease to drive any SCSI bus signals.
1348 *
1349 *      If successful : I_T_L or I_T_L_Q nexus will be established, 
1350 *              instance->connected will be set to cmd.  
1351 *              SELECT interrupt will be disabled.
1352 *
1353 *      If failed (no target) : cmd->scsi_done() will be called, and the 
1354 *              cmd->result host byte set to DID_BAD_TARGET.
1355 */
1356
1357static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1358                          int tag)
1359{
1360    SETUP_HOSTDATA(instance);
1361    unsigned char tmp[3], phase;
1362    unsigned char *data;
1363    int len;
1364    unsigned long timeout;
1365    unsigned long flags;
1366
1367    hostdata->restart_select = 0;
1368    NCR_PRINT(NDEBUG_ARBITRATION);
1369    ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1370               instance->this_id);
1371
1372    /* 
1373     * Set the phase bits to 0, otherwise the NCR5380 won't drive the 
1374     * data bus during SELECTION.
1375     */
1376
1377    local_irq_save(flags);
1378    if (hostdata->connected) {
1379        local_irq_restore(flags);
1380        return -1;
1381    }
1382    NCR5380_write(TARGET_COMMAND_REG, 0);
1383
1384
1385    /* 
1386     * Start arbitration.
1387     */
1388    
1389    NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1390    NCR5380_write(MODE_REG, MR_ARBITRATE);
1391
1392    local_irq_restore(flags);
1393
1394    /* Wait for arbitration logic to complete */
1395#ifdef NCR_TIMEOUT
1396    {
1397      unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1398
1399      while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1400           && time_before(jiffies, timeout) && !hostdata->connected)
1401        ;
1402      if (time_after_eq(jiffies, timeout))
1403      {
1404        printk("scsi : arbitration timeout at %d\n", __LINE__);
1405        NCR5380_write(MODE_REG, MR_BASE);
1406        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1407        return -1;
1408      }
1409    }
1410#else /* NCR_TIMEOUT */
1411    while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1412         && !hostdata->connected);
1413#endif
1414
1415    ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1416
1417    if (hostdata->connected) {
1418        NCR5380_write(MODE_REG, MR_BASE); 
1419        return -1;
1420    }
1421    /* 
1422     * The arbitration delay is 2.2us, but this is a minimum and there is 
1423     * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1424     * the integral nature of udelay().
1425     *
1426     */
1427
1428    udelay(3);
1429
1430    /* Check for lost arbitration */
1431    if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1432        (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1433        (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1434        hostdata->connected) {
1435        NCR5380_write(MODE_REG, MR_BASE); 
1436        ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1437                   HOSTNO);
1438        return -1;
1439    }
1440
1441     /* after/during arbitration, BSY should be asserted.
1442        IBM DPES-31080 Version S31Q works now */
1443     /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1444    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1445                                         ICR_ASSERT_BSY ) ;
1446    
1447    if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1448        hostdata->connected) {
1449        NCR5380_write(MODE_REG, MR_BASE);
1450        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1451        ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1452                   HOSTNO);
1453        return -1;
1454    }
1455
1456    /* 
1457     * Again, bus clear + bus settle time is 1.2us, however, this is 
1458     * a minimum so we'll udelay ceil(1.2)
1459     */
1460
1461#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1462    /* ++roman: But some targets (see above :-) seem to need a bit more... */
1463    udelay(15);
1464#else
1465    udelay(2);
1466#endif
1467    
1468    if (hostdata->connected) {
1469        NCR5380_write(MODE_REG, MR_BASE);
1470        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1471        return -1;
1472    }
1473
1474    ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1475
1476    /* 
1477     * Now that we have won arbitration, start Selection process, asserting 
1478     * the host and target ID's on the SCSI bus.
1479     */
1480
1481    NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1482
1483    /* 
1484     * Raise ATN while SEL is true before BSY goes false from arbitration,
1485     * since this is the only way to guarantee that we'll get a MESSAGE OUT
1486     * phase immediately after selection.
1487     */
1488
1489    NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | 
1490        ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1491    NCR5380_write(MODE_REG, MR_BASE);
1492
1493    /* 
1494     * Reselect interrupts must be turned off prior to the dropping of BSY,
1495     * otherwise we will trigger an interrupt.
1496     */
1497
1498    if (hostdata->connected) {
1499        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1500        return -1;
1501    }
1502
1503    NCR5380_write(SELECT_ENABLE_REG, 0);
1504
1505    /*
1506     * The initiator shall then wait at least two deskew delays and release 
1507     * the BSY signal.
1508     */
1509    udelay(1);        /* wingel -- wait two bus deskew delay >2*45ns */
1510
1511    /* Reset BSY */
1512    NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | 
1513        ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1514
1515    /* 
1516     * Something weird happens when we cease to drive BSY - looks
1517     * like the board/chip is letting us do another read before the 
1518     * appropriate propagation delay has expired, and we're confusing
1519     * a BSY signal from ourselves as the target's response to SELECTION.
1520     *
1521     * A small delay (the 'C++' frontend breaks the pipeline with an
1522     * unnecessary jump, making it work on my 386-33/Trantor T128, the
1523     * tighter 'C' code breaks and requires this) solves the problem - 
1524     * the 1 us delay is arbitrary, and only used because this delay will 
1525     * be the same on other platforms and since it works here, it should 
1526     * work there.
1527     *
1528     * wingel suggests that this could be due to failing to wait
1529     * one deskew delay.
1530     */
1531
1532    udelay(1);
1533
1534    SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1535
1536    /* 
1537     * The SCSI specification calls for a 250 ms timeout for the actual 
1538     * selection.
1539     */
1540
1541    timeout = jiffies + 25; 
1542
1543    /* 
1544     * XXX very interesting - we're seeing a bounce where the BSY we 
1545     * asserted is being reflected / still asserted (propagation delay?)
1546     * and it's detecting as true.  Sigh.
1547     */
1548
1549#if 0
1550    /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1551     * IO while SEL is true. But again, there are some disks out the in the
1552     * world that do that nevertheless. (Somebody claimed that this announces
1553     * reselection capability of the target.) So we better skip that test and
1554     * only wait for BSY... (Famous german words: Der Kl├╝gere gibt nach :-)
1555     */
1556
1557    while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & 
1558        (SR_BSY | SR_IO)));
1559
1560    if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == 
1561            (SR_SEL | SR_IO)) {
1562            NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1563            NCR5380_reselect(instance);
1564            printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1565                    HOSTNO);
1566            NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1567            return -1;
1568    }
1569#else
1570    while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1571#endif
1572
1573    /* 
1574     * No less than two deskew delays after the initiator detects the 
1575     * BSY signal is true, it shall release the SEL signal and may 
1576     * change the DATA BUS.                                     -wingel
1577     */
1578
1579    udelay(1);
1580
1581    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1582
1583    if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1584        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1585        if (hostdata->targets_present & (1 << cmd->device->id)) {
1586            printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1587            if (hostdata->restart_select)
1588                printk(KERN_NOTICE "\trestart select\n");
1589            NCR_PRINT(NDEBUG_ANY);
1590            NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1591            return -1;
1592        }
1593        cmd->result = DID_BAD_TARGET << 16;
1594#ifdef NCR5380_STATS
1595        collect_stats(hostdata, cmd);
1596#endif
1597#ifdef SUPPORT_TAGS
1598        cmd_free_tag( cmd );
1599#endif
1600        cmd->scsi_done(cmd);
1601        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1602        SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1603        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1604        return 0;
1605    } 
1606
1607    hostdata->targets_present |= (1 << cmd->device->id);
1608
1609    /*
1610     * Since we followed the SCSI spec, and raised ATN while SEL 
1611     * was true but before BSY was false during selection, the information
1612     * transfer phase should be a MESSAGE OUT phase so that we can send the
1613     * IDENTIFY message.
1614     * 
1615     * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1616     * message (2 bytes) with a tag ID that we increment with every command
1617     * until it wraps back to 0.
1618     *
1619     * XXX - it turns out that there are some broken SCSI-II devices,
1620     *       which claim to support tagged queuing but fail when more than
1621     *       some number of commands are issued at once.
1622     */
1623
1624    /* Wait for start of REQ/ACK handshake */
1625    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1626
1627    SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1628               HOSTNO, cmd->device->id);
1629    tmp[0] = IDENTIFY(1, cmd->device->lun);
1630
1631#ifdef SUPPORT_TAGS
1632    if (cmd->tag != TAG_NONE) {
1633        tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1634        tmp[2] = cmd->tag;
1635        len = 3;
1636    } else 
1637        len = 1;
1638#else
1639    len = 1;
1640    cmd->tag=0;
1641#endif /* SUPPORT_TAGS */
1642
1643    /* Send message(s) */
1644    data = tmp;
1645    phase = PHASE_MSGOUT;
1646    NCR5380_transfer_pio(instance, &phase, &len, &data);
1647    SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1648    /* XXX need to handle errors here */
1649    hostdata->connected = cmd;
1650#ifndef SUPPORT_TAGS
1651    hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1652#endif    
1653#ifdef SUN3_SCSI_VME
1654    dregs->csr |= CSR_INTR;
1655#endif
1656    initialize_SCp(cmd);
1657
1658
1659    return 0;
1660}
1661
1662/* 
1663 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 
1664 *      unsigned char *phase, int *count, unsigned char **data)
1665 *
1666 * Purpose : transfers data in given phase using polled I/O
1667 *
1668 * Inputs : instance - instance of driver, *phase - pointer to 
1669 *      what phase is expected, *count - pointer to number of 
1670 *      bytes to transfer, **data - pointer to data pointer.
1671 * 
1672 * Returns : -1 when different phase is entered without transferring
1673 *      maximum number of bytes, 0 if all bytes are transferred or exit
1674 *      is in same phase.
1675 *
1676 *      Also, *phase, *count, *data are modified in place.
1677 *
1678 * XXX Note : handling for bus free may be useful.
1679 */
1680
1681/*
1682 * Note : this code is not as quick as it could be, however it 
1683 * IS 100% reliable, and for the actual data transfer where speed
1684 * counts, we will always do a pseudo DMA or DMA transfer.
1685 */
1686
1687static int NCR5380_transfer_pio( struct Scsi_Host *instance, 
1688                                 unsigned char *phase, int *count,
1689                                 unsigned char **data)
1690{
1691    register unsigned char p = *phase, tmp;
1692    register int c = *count;
1693    register unsigned char *d = *data;
1694
1695    /* 
1696     * The NCR5380 chip will only drive the SCSI bus when the 
1697     * phase specified in the appropriate bits of the TARGET COMMAND
1698     * REGISTER match the STATUS REGISTER
1699     */
1700
1701    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1702
1703    do {
1704        /* 
1705         * Wait for assertion of REQ, after which the phase bits will be 
1706         * valid 
1707         */
1708        while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1709
1710        HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1711
1712        /* Check for phase mismatch */  
1713        if ((tmp & PHASE_MASK) != p) {
1714            PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1715            NCR_PRINT_PHASE(NDEBUG_PIO);
1716            break;
1717        }
1718
1719        /* Do actual transfer from SCSI bus to / from memory */
1720        if (!(p & SR_IO)) 
1721            NCR5380_write(OUTPUT_DATA_REG, *d);
1722        else 
1723            *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1724
1725        ++d;
1726
1727        /* 
1728         * The SCSI standard suggests that in MSGOUT phase, the initiator
1729         * should drop ATN on the last byte of the message phase
1730         * after REQ has been asserted for the handshake but before
1731         * the initiator raises ACK.
1732         */
1733
1734        if (!(p & SR_IO)) {
1735            if (!((p & SR_MSG) && c > 1)) {
1736                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1737                    ICR_ASSERT_DATA);
1738                NCR_PRINT(NDEBUG_PIO);
1739                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1740                        ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1741            } else {
1742                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1743                    ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1744                NCR_PRINT(NDEBUG_PIO);
1745                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1746                    ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1747            }
1748        } else {
1749            NCR_PRINT(NDEBUG_PIO);
1750            NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1751        }
1752
1753        while (NCR5380_read(STATUS_REG) & SR_REQ);
1754
1755        HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1756
1757/*
1758 * We have several special cases to consider during REQ/ACK handshaking : 
1759 * 1.  We were in MSGOUT phase, and we are on the last byte of the 
1760 *      message.  ATN must be dropped as ACK is dropped.
1761 *
1762 * 2.  We are in a MSGIN phase, and we are on the last byte of the  
1763 *      message.  We must exit with ACK asserted, so that the calling
1764 *      code may raise ATN before dropping ACK to reject the message.
1765 *
1766 * 3.  ACK and ATN are clear and the target may proceed as normal.
1767 */
1768        if (!(p == PHASE_MSGIN && c == 1)) {  
1769            if (p == PHASE_MSGOUT && c > 1)
1770                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1771            else
1772                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1773        } 
1774    } while (--c);
1775
1776    PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1777
1778    *count = c;
1779    *data = d;
1780    tmp = NCR5380_read(STATUS_REG);
1781    /* The phase read from the bus is valid if either REQ is (already)
1782     * asserted or if ACK hasn't been released yet. The latter is the case if
1783     * we're in MSGIN and all wanted bytes have been received. */
1784    if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1785        *phase = tmp & PHASE_MASK;
1786    else 
1787        *phase = PHASE_UNKNOWN;
1788
1789    if (!c || (*phase == p))
1790        return 0;
1791    else 
1792        return -1;
1793}
1794
1795/*
1796 * Function : do_abort (Scsi_Host *host)
1797 * 
1798 * Purpose : abort the currently established nexus.  Should only be 
1799 *      called from a routine which can drop into a 
1800 * 
1801 * Returns : 0 on success, -1 on failure.
1802 */
1803
1804static int do_abort (struct Scsi_Host *host) 
1805{
1806    unsigned char tmp, *msgptr, phase;
1807    int len;
1808
1809    /* Request message out phase */
1810    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1811
1812    /* 
1813     * Wait for the target to indicate a valid phase by asserting 
1814     * REQ.  Once this happens, we'll have either a MSGOUT phase 
1815     * and can immediately send the ABORT message, or we'll have some 
1816     * other phase and will have to source/sink data.
1817     * 
1818     * We really don't care what value was on the bus or what value
1819     * the target sees, so we just handshake.
1820     */
1821    
1822    while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1823
1824    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1825
1826    if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1827        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 
1828                      ICR_ASSERT_ACK);
1829        while (NCR5380_read(STATUS_REG) & SR_REQ);
1830        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1831    }
1832   
1833    tmp = ABORT;
1834    msgptr = &tmp;
1835    len = 1;
1836    phase = PHASE_MSGOUT;
1837    NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1838
1839    /*
1840     * If we got here, and the command completed successfully,
1841     * we're about to go into bus free state.
1842     */
1843
1844    return len ? -1 : 0;
1845}
1846
1847#if defined(REAL_DMA)
1848/* 
1849 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 
1850 *      unsigned char *phase, int *count, unsigned char **data)
1851 *
1852 * Purpose : transfers data in given phase using either real
1853 *      or pseudo DMA.
1854 *
1855 * Inputs : instance - instance of driver, *phase - pointer to 
1856 *      what phase is expected, *count - pointer to number of 
1857 *      bytes to transfer, **data - pointer to data pointer.
1858 * 
1859 * Returns : -1 when different phase is entered without transferring
1860 *      maximum number of bytes, 0 if all bytes or transferred or exit
1861 *      is in same phase.
1862 *
1863 *      Also, *phase, *count, *data are modified in place.
1864 *
1865 */
1866
1867
1868static int NCR5380_transfer_dma( struct Scsi_Host *instance, 
1869                                 unsigned char *phase, int *count,
1870                                 unsigned char **data)
1871{
1872    SETUP_HOSTDATA(instance);
1873    register int c = *count;
1874    register unsigned char p = *phase;
1875    unsigned long flags;
1876
1877    /* sanity check */
1878    if(!sun3_dma_setup_done) {
1879         printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1880         BUG();
1881    }
1882    hostdata->dma_len = c;
1883
1884    DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1885               HOSTNO, (p & SR_IO) ? "reading" : "writing",
1886               c, (p & SR_IO) ? "to" : "from", *data);
1887
1888    /* netbsd turns off ints here, why not be safe and do it too */
1889    local_irq_save(flags);
1890    
1891    /* send start chain */
1892    sun3scsi_dma_start(c, *data);
1893    
1894    if (p & SR_IO) {
1895            NCR5380_write(TARGET_COMMAND_REG, 1);
1896            NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1897            NCR5380_write(INITIATOR_COMMAND_REG, 0);
1898            NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1899            NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1900    } else {
1901            NCR5380_write(TARGET_COMMAND_REG, 0);
1902            NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1903            NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1904            NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1905            NCR5380_write(START_DMA_SEND_REG, 0);
1906    }
1907
1908#ifdef SUN3_SCSI_VME
1909    dregs->csr |= CSR_DMA_ENABLE;
1910#endif
1911
1912    local_irq_restore(flags);
1913
1914    sun3_dma_active = 1;
1915    return 0;
1916}
1917#endif /* defined(REAL_DMA) */
1918
1919/*
1920 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1921 *
1922 * Purpose : run through the various SCSI phases and do as the target 
1923 *      directs us to.  Operates on the currently connected command, 
1924 *      instance->connected.
1925 *
1926 * Inputs : instance, instance for which we are doing commands
1927 *
1928 * Side effects : SCSI things happen, the disconnected queue will be 
1929 *      modified if a command disconnects, *instance->connected will
1930 *      change.
1931 *
1932 * XXX Note : we need to watch for bus free or a reset condition here 
1933 *      to recover from an unexpected bus free condition.
1934 */
1935 
1936static void NCR5380_information_transfer (struct Scsi_Host *instance)
1937{
1938    SETUP_HOSTDATA(instance);
1939    unsigned long flags;
1940    unsigned char msgout = NOP;
1941    int sink = 0;
1942    int len;
1943#if defined(REAL_DMA)
1944    int transfersize;
1945#endif
1946    unsigned char *data;
1947    unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
1948    struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1949
1950#ifdef SUN3_SCSI_VME
1951    dregs->csr |= CSR_INTR;
1952#endif
1953
1954    while (1) {
1955        tmp = NCR5380_read(STATUS_REG);
1956        /* We only have a valid SCSI phase when REQ is asserted */
1957        if (tmp & SR_REQ) {
1958            phase = (tmp & PHASE_MASK); 
1959            if (phase != old_phase) {
1960                old_phase = phase;
1961                NCR_PRINT_PHASE(NDEBUG_INFORMATION);
1962            }
1963
1964            if(phase == PHASE_CMDOUT) {
1965                    void *d;
1966                    unsigned long count;
1967
1968                if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1969                        count = cmd->SCp.buffer->length;
1970                        d = SGADDR(cmd->SCp.buffer);
1971                } else {
1972                        count = cmd->SCp.this_residual;
1973                        d = cmd->SCp.ptr;
1974                }
1975#ifdef REAL_DMA
1976                /* this command setup for dma yet? */
1977                if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
1978                                                  != cmd))
1979                {
1980                        if (cmd->request->cmd_type == REQ_TYPE_FS) {
1981                                sun3scsi_dma_setup(d, count,
1982                                                   rq_data_dir(cmd->request));
1983                                sun3_dma_setup_done = cmd;
1984                        }
1985                }
1986#endif
1987#ifdef SUN3_SCSI_VME
1988                dregs->csr |= CSR_INTR;
1989#endif
1990            }
1991
1992            
1993            if (sink && (phase != PHASE_MSGOUT)) {
1994                NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1995
1996                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 
1997                    ICR_ASSERT_ACK);
1998                while (NCR5380_read(STATUS_REG) & SR_REQ);
1999                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
2000                    ICR_ASSERT_ATN);
2001                sink = 0;
2002                continue;
2003            }
2004
2005            switch (phase) {
2006            case PHASE_DATAOUT:
2007#if (NDEBUG & NDEBUG_NO_DATAOUT)
2008                printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2009                       "aborted\n", HOSTNO);
2010                sink = 1;
2011                do_abort(instance);
2012                cmd->result = DID_ERROR  << 16;
2013                cmd->scsi_done(cmd);
2014                return;
2015#endif
2016            case PHASE_DATAIN:
2017                /* 
2018                 * If there is no room left in the current buffer in the
2019                 * scatter-gather list, move onto the next one.
2020                 */
2021                if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2022                    ++cmd->SCp.buffer;
2023                    --cmd->SCp.buffers_residual;
2024                    cmd->SCp.this_residual = cmd->SCp.buffer->length;
2025                    cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
2026                    INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2027                               HOSTNO, cmd->SCp.this_residual,
2028                               cmd->SCp.buffers_residual);
2029                }
2030
2031                /*
2032                 * The preferred transfer method is going to be 
2033                 * PSEUDO-DMA for systems that are strictly PIO,
2034                 * since we can let the hardware do the handshaking.
2035                 *
2036                 * For this to work, we need to know the transfersize
2037                 * ahead of time, since the pseudo-DMA code will sit
2038                 * in an unconditional loop.
2039                 */
2040
2041/* ++roman: I suggest, this should be
2042 *   #if def(REAL_DMA)
2043 * instead of leaving REAL_DMA out.
2044 */
2045
2046#if defined(REAL_DMA)
2047//              if (!cmd->device->borken &&
2048                if((transfersize =
2049                    NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2050                    len = transfersize;
2051                    cmd->SCp.phase = phase;
2052
2053                    if (NCR5380_transfer_dma(instance, &phase,
2054                        &len, (unsigned char **) &cmd->SCp.ptr)) {
2055                        /*
2056                         * If the watchdog timer fires, all future
2057                         * accesses to this device will use the
2058                         * polled-IO. */ 
2059                        printk(KERN_NOTICE "scsi%d: switching target %d "
2060                               "lun %d to slow handshake\n", HOSTNO,
2061                               cmd->device->id, cmd->device->lun);
2062                        cmd->device->borken = 1;
2063                        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
2064                            ICR_ASSERT_ATN);
2065                        sink = 1;
2066                        do_abort(instance);
2067                        cmd->result = DID_ERROR  << 16;
2068                        cmd->scsi_done(cmd);
2069                        /* XXX - need to source or sink data here, as appropriate */
2070                    } else {
2071#ifdef REAL_DMA
2072                        /* ++roman: When using real DMA,
2073                         * information_transfer() should return after
2074                         * starting DMA since it has nothing more to
2075                         * do.
2076                         */
2077                                    return;
2078#else                   
2079                        cmd->SCp.this_residual -= transfersize - len;
2080#endif
2081                    }
2082                } else 
2083#endif /* defined(REAL_DMA) */
2084                  NCR5380_transfer_pio(instance, &phase, 
2085                    (int *) &cmd->SCp.this_residual, (unsigned char **)
2086                    &cmd->SCp.ptr);
2087#ifdef REAL_DMA
2088                /* if we had intended to dma that command clear it */
2089                if(sun3_dma_setup_done == cmd)
2090                        sun3_dma_setup_done = NULL;
2091#endif
2092
2093                break;
2094            case PHASE_MSGIN:
2095                len = 1;
2096                data = &tmp;
2097                NCR5380_write(SELECT_ENABLE_REG, 0);    /* disable reselects */
2098                NCR5380_transfer_pio(instance, &phase, &len, &data);
2099                cmd->SCp.Message = tmp;
2100                
2101                switch (tmp) {
2102                /*
2103                 * Linking lets us reduce the time required to get the 
2104                 * next command out to the device, hopefully this will
2105                 * mean we don't waste another revolution due to the delays
2106                 * required by ARBITRATION and another SELECTION.
2107                 *
2108                 * In the current implementation proposal, low level drivers
2109                 * merely have to start the next command, pointed to by 
2110                 * next_link, done() is called as with unlinked commands.
2111                 */
2112#ifdef LINKED
2113                case LINKED_CMD_COMPLETE:
2114                case LINKED_FLG_CMD_COMPLETE:
2115                    /* Accept message by clearing ACK */
2116                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2117                    
2118                    LNK_PRINTK("scsi%d: target %d lun %d linked command "
2119                               "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2120
2121                    /* Enable reselect interrupts */
2122                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2123                    /*
2124                     * Sanity check : A linked command should only terminate
2125                     * with one of these messages if there are more linked
2126                     * commands available.
2127                     */
2128
2129                    if (!cmd->next_link) {
2130                         printk(KERN_NOTICE "scsi%d: target %d lun %d "
2131                                "linked command complete, no next_link\n",
2132                                HOSTNO, cmd->device->id, cmd->device->lun);
2133                            sink = 1;
2134                            do_abort (instance);
2135                            return;
2136                    }
2137
2138                    initialize_SCp(cmd->next_link);
2139                    /* The next command is still part of this process; copy it
2140                     * and don't free it! */
2141                    cmd->next_link->tag = cmd->tag;
2142                    cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 
2143                    LNK_PRINTK("scsi%d: target %d lun %d linked request "
2144                               "done, calling scsi_done().\n",
2145                               HOSTNO, cmd->device->id, cmd->device->lun);
2146#ifdef NCR5380_STATS
2147                    collect_stats(hostdata, cmd);
2148#endif
2149                    cmd->scsi_done(cmd);
2150                    cmd = hostdata->connected;
2151                    break;
2152#endif /* def LINKED */
2153                case ABORT:
2154                case COMMAND_COMPLETE: 
2155                    /* Accept message by clearing ACK */
2156                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2157                    hostdata->connected = NULL;
2158                    QU_PRINTK("scsi%d: command for target %d, lun %d "
2159                              "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2160#ifdef SUPPORT_TAGS
2161                    cmd_free_tag( cmd );
2162                    if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2163                        /* Turn a QUEUE FULL status into BUSY, I think the
2164                         * mid level cannot handle QUEUE FULL :-( (The
2165                         * command is retried after BUSY). Also update our
2166                         * queue size to the number of currently issued
2167                         * commands now.
2168                         */
2169                        /* ++Andreas: the mid level code knows about
2170                           QUEUE_FULL now. */
2171                        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2172                        TAG_PRINTK("scsi%d: target %d lun %d returned "
2173                                   "QUEUE_FULL after %d commands\n",
2174                                   HOSTNO, cmd->device->id, cmd->device->lun,
2175                                   ta->nr_allocated);
2176                        if (ta->queue_size > ta->nr_allocated)
2177                            ta->nr_allocated = ta->queue_size;
2178                    }
2179#else
2180                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2181#endif
2182                    /* Enable reselect interrupts */
2183                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2184
2185                    /* 
2186                     * I'm not sure what the correct thing to do here is : 
2187                     * 
2188                     * If the command that just executed is NOT a request 
2189                     * sense, the obvious thing to do is to set the result
2190                     * code to the values of the stored parameters.
2191                     * 
2192                     * If it was a REQUEST SENSE command, we need some way to
2193                     * differentiate between the failure code of the original
2194                     * and the failure code of the REQUEST sense - the obvious
2195                     * case is success, where we fall through and leave the
2196                     * result code unchanged.
2197                     * 
2198                     * The non-obvious place is where the REQUEST SENSE failed
2199                     */
2200
2201                    if (cmd->cmnd[0] != REQUEST_SENSE) 
2202                        cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 
2203                    else if (status_byte(cmd->SCp.Status) != GOOD)
2204                        cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2205                    
2206#ifdef AUTOSENSE
2207                    if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2208                                                hostdata->ses.cmd_len) {
2209                        scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2210                        hostdata->ses.cmd_len = 0 ;
2211                    }
2212
2213                    if ((cmd->cmnd[0] != REQUEST_SENSE) && 
2214                        (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2215                        scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2216                        ASEN_PRINTK("scsi%d: performing request sense\n",
2217                                    HOSTNO);
2218                        /* this is initialized from initialize_SCp 
2219                        cmd->SCp.buffer = NULL;
2220                        cmd->SCp.buffers_residual = 0;
2221                        */
2222
2223                        local_irq_save(flags);
2224                        LIST(cmd,hostdata->issue_queue);
2225                        SET_NEXT(cmd, hostdata->issue_queue);
2226                        hostdata->issue_queue = (struct scsi_cmnd *) cmd;
2227                        local_irq_restore(flags);
2228                        QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2229                                  "issue queue\n", H_NO(cmd));
2230                   } else
2231#endif /* def AUTOSENSE */
2232                   {
2233#ifdef NCR5380_STATS
2234                       collect_stats(hostdata, cmd);
2235#endif
2236                       cmd->scsi_done(cmd);
2237                    }
2238
2239                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2240                    /* 
2241                     * Restore phase bits to 0 so an interrupted selection, 
2242                     * arbitration can resume.
2243                     */
2244                    NCR5380_write(TARGET_COMMAND_REG, 0);
2245                    
2246                    while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2247                        barrier();
2248
2249                    return;
2250                case MESSAGE_REJECT:
2251                    /* Accept message by clearing ACK */
2252                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2253                    /* Enable reselect interrupts */
2254                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2255                    switch (hostdata->last_message) {
2256                    case HEAD_OF_QUEUE_TAG:
2257                    case ORDERED_QUEUE_TAG:
2258                    case SIMPLE_QUEUE_TAG:
2259                        /* The target obviously doesn't support tagged
2260                         * queuing, even though it announced this ability in
2261                         * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2262                         * clear 'tagged_supported' and lock the LUN, since
2263                         * the command is treated as untagged further on.
2264                         */
2265                        cmd->device->tagged_supported = 0;
2266                        hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2267                        cmd->tag = TAG_NONE;
2268                        TAG_PRINTK("scsi%d: target %d lun %d rejected "
2269                                   "QUEUE_TAG message; tagged queuing "
2270                                   "disabled\n",
2271                                   HOSTNO, cmd->device->id, cmd->device->lun);
2272                        break;
2273                    }
2274                    break;
2275                case DISCONNECT:
2276                    /* Accept message by clearing ACK */
2277                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2278                    local_irq_save(flags);
2279                    cmd->device->disconnect = 1;
2280                    LIST(cmd,hostdata->disconnected_queue);
2281                    SET_NEXT(cmd, hostdata->disconnected_queue);
2282                    hostdata->connected = NULL;
2283                    hostdata->disconnected_queue = cmd;
2284                    local_irq_restore(flags);
2285                    QU_PRINTK("scsi%d: command for target %d lun %d was "
2286                              "moved from connected to the "
2287                              "disconnected_queue\n", HOSTNO, 
2288                              cmd->device->id, cmd->device->lun);
2289                    /* 
2290                     * Restore phase bits to 0 so an interrupted selection, 
2291                     * arbitration can resume.
2292                     */
2293                    NCR5380_write(TARGET_COMMAND_REG, 0);
2294
2295                    /* Enable reselect interrupts */
2296                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2297                    /* Wait for bus free to avoid nasty timeouts */
2298                    while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2299                        barrier();
2300#ifdef SUN3_SCSI_VME
2301                    dregs->csr |= CSR_DMA_ENABLE;
2302#endif
2303                    return;
2304                /* 
2305                 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2306                 * operation, in violation of the SCSI spec so we can safely 
2307                 * ignore SAVE/RESTORE pointers calls.
2308                 *
2309                 * Unfortunately, some disks violate the SCSI spec and 
2310                 * don't issue the required SAVE_POINTERS message before
2311                 * disconnecting, and we have to break spec to remain 
2312                 * compatible.
2313                 */
2314                case SAVE_POINTERS:
2315                case RESTORE_POINTERS:
2316                    /* Accept message by clearing ACK */
2317                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2318                    /* Enable reselect interrupts */
2319                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2320                    break;
2321                case EXTENDED_MESSAGE:
2322/* 
2323 * Extended messages are sent in the following format :
2324 * Byte         
2325 * 0            EXTENDED_MESSAGE == 1
2326 * 1            length (includes one byte for code, doesn't 
2327 *              include first two bytes)
2328 * 2            code
2329 * 3..length+1  arguments
2330 *
2331 * Start the extended message buffer with the EXTENDED_MESSAGE
2332 * byte, since spi_print_msg() wants the whole thing.  
2333 */
2334                    extended_msg[0] = EXTENDED_MESSAGE;
2335                    /* Accept first byte by clearing ACK */
2336                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2337
2338                    EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2339
2340                    len = 2;
2341                    data = extended_msg + 1;
2342                    phase = PHASE_MSGIN;
2343                    NCR5380_transfer_pio(instance, &phase, &len, &data);
2344                    EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2345                               (int)extended_msg[1], (int)extended_msg[2]);
2346
2347                    if (!len && extended_msg[1] <= 
2348                        (sizeof (extended_msg) - 1)) {
2349                        /* Accept third byte by clearing ACK */
2350                        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2351                        len = extended_msg[1] - 1;
2352                        data = extended_msg + 3;
2353                        phase = PHASE_MSGIN;
2354
2355                        NCR5380_transfer_pio(instance, &phase, &len, &data);
2356                        EXT_PRINTK("scsi%d: message received, residual %d\n",
2357                                   HOSTNO, len);
2358
2359                        switch (extended_msg[2]) {
2360                        case EXTENDED_SDTR:
2361                        case EXTENDED_WDTR:
2362                        case EXTENDED_MODIFY_DATA_POINTER:
2363                        case EXTENDED_EXTENDED_IDENTIFY:
2364                            tmp = 0;
2365                        }
2366                    } else if (len) {
2367                        printk(KERN_NOTICE "scsi%d: error receiving "
2368                               "extended message\n", HOSTNO);
2369                        tmp = 0;
2370                    } else {
2371                        printk(KERN_NOTICE "scsi%d: extended message "
2372                               "code %02x length %d is too long\n",
2373                               HOSTNO, extended_msg[2], extended_msg[1]);
2374                        tmp = 0;
2375                    }
2376                /* Fall through to reject message */
2377
2378                /* 
2379                 * If we get something weird that we aren't expecting, 
2380                 * reject it.
2381                 */
2382                default:
2383                    if (!tmp) {
2384                        printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2385                        spi_print_msg(extended_msg);
2386                        printk("\n");
2387                    } else if (tmp != EXTENDED_MESSAGE)
2388                        printk(KERN_DEBUG "scsi%d: rejecting unknown "
2389                               "message %02x from target %d, lun %d\n",
2390                               HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2391                    else
2392                        printk(KERN_DEBUG "scsi%d: rejecting unknown "
2393                               "extended message "
2394                               "code %02x, length %d from target %d, lun %d\n",
2395                               HOSTNO, extended_msg[1], extended_msg[0],
2396                               cmd->device->id, cmd->device->lun);
2397   
2398
2399                    msgout = MESSAGE_REJECT;
2400                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
2401                        ICR_ASSERT_ATN);
2402                    break;
2403                } /* switch (tmp) */
2404                break;
2405            case PHASE_MSGOUT:
2406                len = 1;
2407                data = &msgout;
2408                hostdata->last_message = msgout;
2409                NCR5380_transfer_pio(instance, &phase, &len, &data);
2410                if (msgout == ABORT) {
2411#ifdef SUPPORT_TAGS
2412                    cmd_free_tag( cmd );
2413#else
2414                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2415#endif
2416                    hostdata->connected = NULL;
2417                    cmd->result = DID_ERROR << 16;
2418#ifdef NCR5380_STATS
2419                    collect_stats(hostdata, cmd);
2420#endif
2421                    cmd->scsi_done(cmd);
2422                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2423                    return;
2424                }
2425                msgout = NOP;
2426                break;
2427            case PHASE_CMDOUT:
2428                len = cmd->cmd_len;
2429                data = cmd->cmnd;
2430                /* 
2431                 * XXX for performance reasons, on machines with a 
2432                 * PSEUDO-DMA architecture we should probably 
2433                 * use the dma transfer function.  
2434                 */
2435                NCR5380_transfer_pio(instance, &phase, &len, 
2436                    &data);
2437                break;
2438            case PHASE_STATIN:
2439                len = 1;
2440                data = &tmp;
2441                NCR5380_transfer_pio(instance, &phase, &len, &data);
2442                cmd->SCp.Status = tmp;
2443                break;
2444            default:
2445                printk("scsi%d: unknown phase\n", HOSTNO);
2446                NCR_PRINT(NDEBUG_ANY);
2447            } /* switch(phase) */
2448        } /* if (tmp * SR_REQ) */ 
2449    } /* while (1) */
2450}
2451
2452/*
2453 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2454 *
2455 * Purpose : does reselection, initializing the instance->connected 
2456 *      field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
2457 *      nexus has been reestablished,
2458 *      
2459 * Inputs : instance - this instance of the NCR5380.
2460 *
2461 */
2462
2463/* it might eventually prove necessary to do a dma setup on
2464   reselection, but it doesn't seem to be needed now -- sam */
2465
2466static void NCR5380_reselect (struct Scsi_Host *instance)
2467{
2468    SETUP_HOSTDATA(instance);
2469    unsigned char target_mask;
2470    unsigned char lun;
2471#ifdef SUPPORT_TAGS
2472    unsigned char tag;
2473#endif
2474    unsigned char msg[3];
2475    struct scsi_cmnd *tmp = NULL, *prev;
2476/*    unsigned long flags; */
2477
2478    /*
2479     * Disable arbitration, etc. since the host adapter obviously
2480     * lost, and tell an interrupted NCR5380_select() to restart.
2481     */
2482
2483    NCR5380_write(MODE_REG, MR_BASE);
2484    hostdata->restart_select = 1;
2485
2486    target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2487
2488    RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2489
2490    /* 
2491     * At this point, we have detected that our SCSI ID is on the bus,
2492     * SEL is true and BSY was false for at least one bus settle delay
2493     * (400 ns).
2494     *
2495     * We must assert BSY ourselves, until the target drops the SEL
2496     * signal.
2497     */
2498
2499    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2500    
2501    while (NCR5380_read(STATUS_REG) & SR_SEL);
2502    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2503
2504    /*
2505     * Wait for target to go into MSGIN.
2506     */
2507
2508    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2509
2510#if 1
2511    // acknowledge toggle to MSGIN
2512    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2513
2514    // peek at the byte without really hitting the bus
2515    msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2516#endif
2517
2518    if (!(msg[0] & 0x80)) {
2519        printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2520        spi_print_msg(msg);
2521        do_abort(instance);
2522        return;
2523    }
2524    lun = (msg[0] & 0x07);
2525
2526    /* 
2527     * Find the command corresponding to the I_T_L or I_T_L_Q  nexus we 
2528     * just reestablished, and remove it from the disconnected queue.
2529     */
2530
2531    for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2532         tmp; prev = tmp, tmp = NEXT(tmp) ) {
2533        if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2534#ifdef SUPPORT_TAGS
2535            && (tag == tmp->tag) 
2536#endif
2537            ) {
2538            if (prev) {
2539                REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2540                SET_NEXT(prev, NEXT(tmp));
2541            } else {
2542                REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2543                hostdata->disconnected_queue = NEXT(tmp);
2544            }
2545            SET_NEXT(tmp, NULL);
2546            break;
2547        }
2548    }
2549    
2550    if (!tmp) {
2551        printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2552#ifdef SUPPORT_TAGS
2553                "tag %d "
2554#endif
2555                "not in disconnected_queue.\n",
2556                HOSTNO, target_mask, lun
2557#ifdef SUPPORT_TAGS
2558                , tag
2559#endif
2560                );
2561        /* 
2562         * Since we have an established nexus that we can't do anything
2563         * with, we must abort it.  
2564         */
2565        do_abort(instance);
2566        return;
2567    }
2568#if 1
2569    /* engage dma setup for the command we just saw */
2570    {
2571            void *d;
2572            unsigned long count;
2573
2574            if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2575                    count = tmp->SCp.buffer->length;
2576                    d = SGADDR(tmp->SCp.buffer);
2577            } else {
2578                    count = tmp->SCp.this_residual;
2579                    d = tmp->SCp.ptr;
2580            }
2581#ifdef REAL_DMA
2582            /* setup this command for dma if not already */
2583            if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2584            {
2585                    sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2586                    sun3_dma_setup_done = tmp;
2587            }
2588#endif
2589    }
2590#endif
2591
2592    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2593    /* Accept message by clearing ACK */
2594    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2595
2596#ifdef SUPPORT_TAGS
2597    /* If the phase is still MSGIN, the target wants to send some more
2598     * messages. In case it supports tagged queuing, this is probably a
2599     * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2600     */
2601    tag = TAG_NONE;
2602    if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2603        /* Accept previous IDENTIFY message by clearing ACK */
2604        NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2605        len = 2;
2606        data = msg+1;
2607        if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2608            msg[1] == SIMPLE_QUEUE_TAG)
2609            tag = msg[2];
2610        TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2611                   "reselection\n", HOSTNO, target_mask, lun, tag);
2612    }
2613#endif
2614    
2615    hostdata->connected = tmp;
2616    RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2617               HOSTNO, tmp->target, tmp->lun, tmp->tag);
2618}
2619
2620
2621/*
2622 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
2623 *
2624 * Purpose : abort a command
2625 *
2626 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
2627 *      host byte of the result field to, if zero DID_ABORTED is 
2628 *      used.
2629 *
2630 * Returns : 0 - success, -1 on failure.
2631 *
2632 * XXX - there is no way to abort the command that is currently 
2633 *       connected, you have to wait for it to complete.  If this is 
2634 *       a problem, we could implement longjmp() / setjmp(), setjmp()
2635 *       called where the loop started in NCR5380_main().
2636 */
2637
2638static int NCR5380_abort(struct scsi_cmnd *cmd)
2639{
2640    struct Scsi_Host *instance = cmd->device->host;
2641    SETUP_HOSTDATA(instance);
2642    struct scsi_cmnd *tmp, **prev;
2643    unsigned long flags;
2644
2645    printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2646    scsi_print_command(cmd);
2647
2648    NCR5380_print_status (instance);
2649
2650    local_irq_save(flags);
2651    
2652    ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2653                NCR5380_read(BUS_AND_STATUS_REG),
2654                NCR5380_read(STATUS_REG));
2655
2656#if 1
2657/* 
2658 * Case 1 : If the command is the currently executing command, 
2659 * we'll set the aborted flag and return control so that 
2660 * information transfer routine can exit cleanly.
2661 */
2662
2663    if (hostdata->connected == cmd) {
2664
2665        ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2666/*
2667 * We should perform BSY checking, and make sure we haven't slipped
2668 * into BUS FREE.
2669 */
2670
2671/*      NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2672/* 
2673 * Since we can't change phases until we've completed the current 
2674 * handshake, we have to source or sink a byte of data if the current
2675 * phase is not MSGOUT.
2676 */
2677
2678/* 
2679 * Return control to the executing NCR drive so we can clear the
2680 * aborted flag and get back into our main loop.
2681 */ 
2682
2683        if (do_abort(instance) == 0) {
2684          hostdata->aborted = 1;
2685          hostdata->connected = NULL;
2686          cmd->result = DID_ABORT << 16;
2687#ifdef SUPPORT_TAGS
2688          cmd_free_tag( cmd );
2689#else
2690          hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2691#endif
2692          local_irq_restore(flags);
2693          cmd->scsi_done(cmd);
2694          return SCSI_ABORT_SUCCESS;
2695        } else {
2696/*        local_irq_restore(flags); */
2697          printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2698          return SCSI_ABORT_ERROR;
2699        } 
2700   }
2701#endif
2702
2703/* 
2704 * Case 2 : If the command hasn't been issued yet, we simply remove it 
2705 *          from the issue queue.
2706 */
2707    for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2708        tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2709        tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
2710        if (cmd == tmp) {
2711            REMOVE(5, *prev, tmp, NEXT(tmp));
2712            (*prev) = NEXT(tmp);
2713            SET_NEXT(tmp, NULL);
2714            tmp->result = DID_ABORT << 16;
2715            local_irq_restore(flags);
2716            ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2717                        HOSTNO);
2718            /* Tagged queuing note: no tag to free here, hasn't been assigned
2719             * yet... */
2720            tmp->scsi_done(tmp);
2721            return SCSI_ABORT_SUCCESS;
2722        }
2723
2724/* 
2725 * Case 3 : If any commands are connected, we're going to fail the abort
2726 *          and let the high level SCSI driver retry at a later time or 
2727 *          issue a reset.
2728 *
2729 *          Timeouts, and therefore aborted commands, will be highly unlikely
2730 *          and handling them cleanly in this situation would make the common
2731 *          case of noresets less efficient, and would pollute our code.  So,
2732 *          we fail.
2733 */
2734
2735    if (hostdata->connected) {
2736        local_irq_restore(flags);
2737        ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2738        return SCSI_ABORT_SNOOZE;
2739    }
2740
2741/*
2742 * Case 4: If the command is currently disconnected from the bus, and 
2743 *      there are no connected commands, we reconnect the I_T_L or 
2744 *      I_T_L_Q nexus associated with it, go into message out, and send 
2745 *      an abort message.
2746 *
2747 * This case is especially ugly. In order to reestablish the nexus, we
2748 * need to call NCR5380_select().  The easiest way to implement this 
2749 * function was to abort if the bus was busy, and let the interrupt
2750 * handler triggered on the SEL for reselect take care of lost arbitrations
2751 * where necessary, meaning interrupts need to be enabled.
2752 *
2753 * When interrupts are enabled, the queues may change - so we 
2754 * can't remove it from the disconnected queue before selecting it
2755 * because that could cause a failure in hashing the nexus if that 
2756 * device reselected.
2757 * 
2758 * Since the queues may change, we can't use the pointers from when we
2759 * first locate it.
2760 *
2761 * So, we must first locate the command, and if NCR5380_select()
2762 * succeeds, then issue the abort, relocate the command and remove
2763 * it from the disconnected queue.
2764 */
2765
2766    for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2767         tmp = NEXT(tmp)) 
2768        if (cmd == tmp) {
2769            local_irq_restore(flags);
2770            ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2771  
2772            if (NCR5380_select (instance, cmd, (int) cmd->tag)) 
2773                return SCSI_ABORT_BUSY;
2774
2775            ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2776
2777            do_abort (instance);
2778
2779            local_irq_save(flags);
2780            for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2781                tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
2782                tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2783                    if (cmd == tmp) {
2784                    REMOVE(5, *prev, tmp, NEXT(tmp));
2785                    *prev = NEXT(tmp);
2786                    SET_NEXT(tmp, NULL);
2787                    tmp->result = DID_ABORT << 16;
2788                    /* We must unlock the tag/LUN immediately here, since the
2789                     * target goes to BUS FREE and doesn't send us another
2790                     * message (COMMAND_COMPLETE or the like)
2791                     */
2792#ifdef SUPPORT_TAGS
2793                    cmd_free_tag( tmp );
2794#else
2795                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2796#endif
2797                    local_irq_restore(flags);
2798                    tmp->scsi_done(tmp);
2799                    return SCSI_ABORT_SUCCESS;
2800                }
2801        }
2802
2803/*
2804 * Case 5 : If we reached this point, the command was not found in any of 
2805 *          the queues.
2806 *
2807 * We probably reached this point because of an unlikely race condition
2808 * between the command completing successfully and the abortion code,
2809 * so we won't panic, but we will notify the user in case something really
2810 * broke.
2811 */
2812
2813    local_irq_restore(flags);
2814    printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); 
2815
2816    return SCSI_ABORT_NOT_RUNNING;
2817}
2818
2819
2820/* 
2821 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2822 * 
2823 * Purpose : reset the SCSI bus.
2824 *
2825 * Returns : SCSI_RESET_WAKEUP
2826 *
2827 */ 
2828
2829static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2830{
2831    SETUP_HOSTDATA(cmd->device->host);
2832    int           i;
2833    unsigned long flags;
2834#if 1
2835    struct scsi_cmnd *connected, *disconnected_queue;
2836#endif
2837
2838
2839    NCR5380_print_status (cmd->device->host);
2840
2841    /* get in phase */
2842    NCR5380_write( TARGET_COMMAND_REG,
2843                   PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2844    /* assert RST */
2845    NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2846    udelay (40);
2847    /* reset NCR registers */
2848    NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2849    NCR5380_write( MODE_REG, MR_BASE );
2850    NCR5380_write( TARGET_COMMAND_REG, 0 );
2851    NCR5380_write( SELECT_ENABLE_REG, 0 );
2852    /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2853     * through anymore ... */
2854    (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2855
2856#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2857      /* XXX see below                                            XXX */
2858
2859    /* MSch: old-style reset: actually abort all command processing here */
2860
2861    /* After the reset, there are no more connected or disconnected commands
2862     * and no busy units; to avoid problems with re-inserting the commands
2863     * into the issue_queue (via scsi_done()), the aborted commands are
2864     * remembered in local variables first.
2865     */
2866    local_irq_save(flags);
2867    connected = (struct scsi_cmnd *)hostdata->connected;
2868    hostdata->connected = NULL;
2869    disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
2870    hostdata->disconnected_queue = NULL;
2871#ifdef SUPPORT_TAGS
2872    free_all_tags();
2873#endif
2874    for( i = 0; i < 8; ++i )
2875        hostdata->busy[i] = 0;
2876#ifdef REAL_DMA
2877    hostdata->dma_len = 0;
2878#endif
2879    local_irq_restore(flags);
2880
2881    /* In order to tell the mid-level code which commands were aborted, 
2882     * set the command status to DID_RESET and call scsi_done() !!!
2883     * This ultimately aborts processing of these commands in the mid-level.
2884     */
2885
2886    if ((cmd = connected)) {
2887        ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2888        cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2889        cmd->scsi_done( cmd );
2890    }
2891
2892    for (i = 0; (cmd = disconnected_queue); ++i) {
2893        disconnected_queue = NEXT(cmd);
2894        SET_NEXT(cmd, NULL);
2895        cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2896        cmd->scsi_done( cmd );
2897    }
2898    if (i > 0)
2899        ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2900
2901
2902    /* since all commands have been explicitly terminated, we need to tell
2903     * the midlevel code that the reset was SUCCESSFUL, and there is no 
2904     * need to 'wake up' the commands by a request_sense
2905     */
2906    return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2907#else /* 1 */
2908
2909    /* MSch: new-style reset handling: let the mid-level do what it can */
2910
2911    /* ++guenther: MID-LEVEL IS STILL BROKEN.
2912     * Mid-level is supposed to requeue all commands that were active on the
2913     * various low-level queues. In fact it does this, but that's not enough
2914     * because all these commands are subject to timeout. And if a timeout
2915     * happens for any removed command, *_abort() is called but all queues
2916     * are now empty. Abort then gives up the falcon lock, which is fatal,
2917     * since the mid-level will queue more commands and must have the lock
2918     * (it's all happening inside timer interrupt handler!!).
2919     * Even worse, abort will return NOT_RUNNING for all those commands not
2920     * on any queue, so they won't be retried ...
2921     *
2922     * Conclusion: either scsi.c disables timeout for all resetted commands
2923     * immediately, or we lose!  As of linux-2.0.20 it doesn't.
2924     */
2925
2926    /* After the reset, there are no more connected or disconnected commands
2927     * and no busy units; so clear the low-level status here to avoid 
2928     * conflicts when the mid-level code tries to wake up the affected 
2929     * commands!
2930     */
2931
2932    if (hostdata->issue_queue)
2933        ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2934    if (hostdata->connected) 
2935        ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2936    if (hostdata->disconnected_queue)
2937        ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2938
2939    local_irq_save(flags);
2940    hostdata->issue_queue = NULL;
2941    hostdata->connected = NULL;
2942    hostdata->disconnected_queue = NULL;
2943#ifdef SUPPORT_TAGS
2944    free_all_tags();
2945#endif
2946    for( i = 0; i < 8; ++i )
2947        hostdata->busy[i] = 0;
2948#ifdef REAL_DMA
2949    hostdata->dma_len = 0;
2950#endif
2951    local_irq_restore(flags);
2952
2953    /* we did no complete reset of all commands, so a wakeup is required */
2954    return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
2955#endif /* 1 */
2956}
2957
2958/* Local Variables: */
2959/* tab-width: 8     */
2960/* End:             */
2961
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.