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 lprint_Scsi_Cmnd(Scsi_Cmnd *cmd)
 665{
 666        int i, s;
 667        unsigned char *command;
 668        printk("scsi%d: destination target %d, lun %d\n",
 669                H_NO(cmd), cmd->device->id, cmd->device->lun);
 670        printk(KERN_CONT "        command = ");
 671        command = cmd->cmnd;
 672        printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]);
 673        for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
 674                printk(KERN_CONT " %02x", command[i]);
 675        printk("\n");
 676}
 677
 678static void NCR5380_print_status(struct Scsi_Host *instance)
 679{
 680        struct NCR5380_hostdata *hostdata;
 681        Scsi_Cmnd *ptr;
 682        unsigned long flags;
 683
 684        NCR_PRINT(NDEBUG_ANY);
 685        NCR_PRINT_PHASE(NDEBUG_ANY);
 686
 687        hostdata = (struct NCR5380_hostdata *)instance->hostdata;
 688
 689        printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
 690        local_irq_save(flags);
 691        printk("NCR5380: coroutine is%s running.\n",
 692                main_running ? "" : "n't");
 693        if (!hostdata->connected)
 694                printk("scsi%d: no currently connected command\n", HOSTNO);
 695        else
 696                lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected);
 697        printk("scsi%d: issue_queue\n", HOSTNO);
 698        for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
 699                lprint_Scsi_Cmnd(ptr);
 700
 701        printk("scsi%d: disconnected_queue\n", HOSTNO);
 702        for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
 703             ptr = NEXT(ptr))
 704                lprint_Scsi_Cmnd(ptr);
 705
 706        local_irq_restore(flags);
 707        printk("\n");
 708}
 709
 710static void show_Scsi_Cmnd(Scsi_Cmnd *cmd, struct seq_file *m)
 711{
 712        int i, s;
 713        unsigned char *command;
 714        seq_printf(m, "scsi%d: destination target %d, lun %d\n",
 715                H_NO(cmd), cmd->device->id, cmd->device->lun);
 716        seq_printf(m, "        command = ");
 717        command = cmd->cmnd;
 718        seq_printf(m, "%2d (0x%02x)", command[0], command[0]);
 719        for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
 720                seq_printf(m, " %02x", command[i]);
 721        seq_printf(m, "\n");
 722}
 723
 724static int NCR5380_show_info(struct seq_file *m, struct Scsi_Host *instance)
 725{
 726        struct NCR5380_hostdata *hostdata;
 727        Scsi_Cmnd *ptr;
 728        unsigned long flags;
 729
 730        hostdata = (struct NCR5380_hostdata *)instance->hostdata;
 731
 732        seq_printf(m, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
 733        local_irq_save(flags);
 734        seq_printf(m, "NCR5380: coroutine is%s running.\n",
 735                main_running ? "" : "n't");
 736        if (!hostdata->connected)
 737                seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);
 738        else
 739                show_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m);
 740        seq_printf(m, "scsi%d: issue_queue\n", HOSTNO);
 741        for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
 742                show_Scsi_Cmnd(ptr, m);
 743
 744        seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO);
 745        for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
 746             ptr = NEXT(ptr))
 747                show_Scsi_Cmnd(ptr, m);
 748
 749        local_irq_restore(flags);
 750        return 0;
 751}
 752
 753/* 
 754 * Function : void NCR5380_init (struct Scsi_Host *instance)
 755 *
 756 * Purpose : initializes *instance and corresponding 5380 chip.
 757 *
 758 * Inputs : instance - instantiation of the 5380 driver.  
 759 *
 760 * Notes : I assume that the host, hostno, and id bits have been
 761 *      set correctly.  I don't care about the irq and other fields. 
 762 * 
 763 */
 764
 765static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
 766{
 767    int i;
 768    SETUP_HOSTDATA(instance);
 769
 770    NCR5380_all_init();
 771
 772    hostdata->aborted = 0;
 773    hostdata->id_mask = 1 << instance->this_id;
 774    hostdata->id_higher_mask = 0;
 775    for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
 776        if (i > hostdata->id_mask)
 777            hostdata->id_higher_mask |= i;
 778    for (i = 0; i < 8; ++i)
 779        hostdata->busy[i] = 0;
 780#ifdef SUPPORT_TAGS
 781    init_tags();
 782#endif
 783#if defined (REAL_DMA)
 784    hostdata->dma_len = 0;
 785#endif
 786    hostdata->targets_present = 0;
 787    hostdata->connected = NULL;
 788    hostdata->issue_queue = NULL;
 789    hostdata->disconnected_queue = NULL;
 790    hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
 791
 792    if (!the_template) {
 793        the_template = instance->hostt;
 794        first_instance = instance;
 795    }
 796        
 797
 798#ifndef AUTOSENSE
 799    if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
 800         printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
 801                "        without AUTOSENSE option, contingent allegiance conditions may\n"
 802                "        be incorrectly cleared.\n", HOSTNO);
 803#endif /* def AUTOSENSE */
 804
 805    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
 806    NCR5380_write(MODE_REG, MR_BASE);
 807    NCR5380_write(TARGET_COMMAND_REG, 0);
 808    NCR5380_write(SELECT_ENABLE_REG, 0);
 809
 810    return 0;
 811}
 812
 813static void NCR5380_exit(struct Scsi_Host *instance)
 814{
 815        /* Empty, as we didn't schedule any delayed work */
 816}
 817
 818/* 
 819 * Function : int NCR5380_queue_command (struct scsi_cmnd *cmd,
 820 *      void (*done)(struct scsi_cmnd *))
 821 *
 822 * Purpose :  enqueues a SCSI command
 823 *
 824 * Inputs : cmd - SCSI command, done - function called on completion, with
 825 *      a pointer to the command descriptor.
 826 * 
 827 * Returns : 0
 828 *
 829 * Side effects : 
 830 *      cmd is added to the per instance issue_queue, with minor 
 831 *      twiddling done to the host specific fields of cmd.  If the 
 832 *      main coroutine is not running, it is restarted.
 833 *
 834 */
 835
 836/* Only make static if a wrapper function is used */
 837static int NCR5380_queue_command_lck(struct scsi_cmnd *cmd,
 838                                 void (*done)(struct scsi_cmnd *))
 839{
 840    SETUP_HOSTDATA(cmd->device->host);
 841    struct scsi_cmnd *tmp;
 842    unsigned long flags;
 843
 844#if (NDEBUG & NDEBUG_NO_WRITE)
 845    switch (cmd->cmnd[0]) {
 846    case WRITE_6:
 847    case WRITE_10:
 848        printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
 849               H_NO(cmd));
 850        cmd->result = (DID_ERROR << 16);
 851        done(cmd);
 852        return 0;
 853    }
 854#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
 855
 856
 857#ifdef NCR5380_STATS
 858# if 0
 859    if (!hostdata->connected && !hostdata->issue_queue &&
 860        !hostdata->disconnected_queue) {
 861        hostdata->timebase = jiffies;
 862    }
 863# endif
 864# ifdef NCR5380_STAT_LIMIT
 865    if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
 866# endif
 867        switch (cmd->cmnd[0])
 868        {
 869            case WRITE:
 870            case WRITE_6:
 871            case WRITE_10:
 872                hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
 873                hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
 874                hostdata->pendingw++;
 875                break;
 876            case READ:
 877            case READ_6:
 878            case READ_10:
 879                hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
 880                hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
 881                hostdata->pendingr++;
 882                break;
 883        }
 884#endif
 885
 886    /* 
 887     * We use the host_scribble field as a pointer to the next command  
 888     * in a queue 
 889     */
 890
 891    SET_NEXT(cmd, NULL);
 892    cmd->scsi_done = done;
 893
 894    cmd->result = 0;
 895
 896
 897    /* 
 898     * Insert the cmd into the issue queue. Note that REQUEST SENSE 
 899     * commands are added to the head of the queue since any command will
 900     * clear the contingent allegiance condition that exists and the 
 901     * sense data is only guaranteed to be valid while the condition exists.
 902     */
 903
 904    local_irq_save(flags);
 905    /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
 906     * Otherwise a running NCR5380_main may steal the lock.
 907     * Lock before actually inserting due to fairness reasons explained in
 908     * atari_scsi.c. If we insert first, then it's impossible for this driver
 909     * to release the lock.
 910     * Stop timer for this command while waiting for the lock, or timeouts
 911     * may happen (and they really do), and it's no good if the command doesn't
 912     * appear in any of the queues.
 913     * ++roman: Just disabling the NCR interrupt isn't sufficient here,
 914     * because also a timer int can trigger an abort or reset, which would
 915     * alter queues and touch the lock.
 916     */
 917    if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
 918        LIST(cmd, hostdata->issue_queue);
 919        SET_NEXT(cmd, hostdata->issue_queue);
 920        hostdata->issue_queue = cmd;
 921    } else {
 922        for (tmp = (struct scsi_cmnd *)hostdata->issue_queue;
 923             NEXT(tmp); tmp = NEXT(tmp))
 924            ;
 925        LIST(cmd, tmp);
 926        SET_NEXT(tmp, cmd);
 927    }
 928
 929    local_irq_restore(flags);
 930
 931    QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
 932              (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
 933
 934    /* If queue_command() is called from an interrupt (real one or bottom
 935     * half), we let queue_main() do the job of taking care about main. If it
 936     * is already running, this is a no-op, else main will be queued.
 937     *
 938     * If we're not in an interrupt, we can call NCR5380_main()
 939     * unconditionally, because it cannot be already running.
 940     */
 941    if (in_interrupt() || ((flags >> 8) & 7) >= 6)
 942        queue_main();
 943    else
 944        NCR5380_main(NULL);
 945    return 0;
 946}
 947
 948static DEF_SCSI_QCMD(NCR5380_queue_command)
 949
 950/*
 951 * Function : NCR5380_main (void) 
 952 *
 953 * Purpose : NCR5380_main is a coroutine that runs as long as more work can 
 954 *      be done on the NCR5380 host adapters in a system.  Both 
 955 *      NCR5380_queue_command() and NCR5380_intr() will try to start it 
 956 *      in case it is not running.
 957 * 
 958 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should 
 959 *  reenable them.  This prevents reentrancy and kernel stack overflow.
 960 */     
 961    
 962static void NCR5380_main (struct work_struct *bl)
 963{
 964    struct scsi_cmnd *tmp, *prev;
 965    struct Scsi_Host *instance = first_instance;
 966    struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
 967    int done;
 968    unsigned long flags;
 969    
 970    /*
 971     * We run (with interrupts disabled) until we're sure that none of 
 972     * the host adapters have anything that can be done, at which point 
 973     * we set main_running to 0 and exit.
 974     *
 975     * Interrupts are enabled before doing various other internal 
 976     * instructions, after we've decided that we need to run through
 977     * the loop again.
 978     *
 979     * this should prevent any race conditions.
 980     * 
 981     * ++roman: Just disabling the NCR interrupt isn't sufficient here,
 982     * because also a timer int can trigger an abort or reset, which can
 983     * alter queues and touch the Falcon lock.
 984     */
 985
 986    /* Tell int handlers main() is now already executing.  Note that
 987       no races are possible here. If an int comes in before
 988       'main_running' is set here, and queues/executes main via the
 989       task queue, it doesn't do any harm, just this instance of main
 990       won't find any work left to do. */
 991    if (main_running)
 992        return;
 993    main_running = 1;
 994
 995    local_save_flags(flags);
 996    do {
 997        local_irq_disable(); /* Freeze request queues */
 998        done = 1;
 999        
1000        if (!hostdata->connected) {
1001            MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO );
1002            /*
1003             * Search through the issue_queue for a command destined
1004             * for a target that's not busy.
1005             */
1006#if (NDEBUG & NDEBUG_LISTS)
1007            for (tmp = (struct scsi_cmnd *) hostdata->issue_queue, prev = NULL;
1008                 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1009                ;
1010            if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
1011#endif
1012            for (tmp = (struct scsi_cmnd *) hostdata->issue_queue,
1013                 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) {
1014
1015#if (NDEBUG & NDEBUG_LISTS)
1016                if (prev != tmp)
1017                    printk("MAIN tmp=%p   target=%d   busy=%d lun=%d\n",
1018                           tmp, tmp->target, hostdata->busy[tmp->target],
1019                           tmp->lun);
1020#endif
1021                /*  When we find one, remove it from the issue queue. */
1022                /* ++guenther: possible race with Falcon locking */
1023                if (
1024#ifdef SUPPORT_TAGS
1025                    !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
1026#else
1027                    !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1028#endif
1029                    ) {
1030                    /* ++guenther: just to be sure, this must be atomic */
1031                    local_irq_disable();
1032                    if (prev) {
1033                        REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
1034                        SET_NEXT(prev, NEXT(tmp));
1035                    } else {
1036                        REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1037                        hostdata->issue_queue = NEXT(tmp);
1038                    }
1039                    SET_NEXT(tmp, NULL);
1040                    
1041                    /* reenable interrupts after finding one */
1042                    local_irq_restore(flags);
1043                    
1044                    /* 
1045                     * Attempt to establish an I_T_L nexus here. 
1046                     * On success, instance->hostdata->connected is set.
1047                     * On failure, we must add the command back to the
1048                     *   issue queue so we can keep trying.     
1049                     */
1050                    MAIN_PRINTK("scsi%d: main(): command for target %d "
1051                                "lun %d removed from issue_queue\n",
1052                                HOSTNO, tmp->target, tmp->lun);
1053                    /* 
1054                     * REQUEST SENSE commands are issued without tagged
1055                     * queueing, even on SCSI-II devices because the 
1056                     * contingent allegiance condition exists for the 
1057                     * entire unit.
1058                     */
1059                    /* ++roman: ...and the standard also requires that
1060                     * REQUEST SENSE command are untagged.
1061                     */
1062                    
1063#ifdef SUPPORT_TAGS
1064                    cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE );
1065#endif
1066                    if (!NCR5380_select(instance, tmp, 
1067                            (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : 
1068                            TAG_NEXT)) {
1069                        break;
1070                    } else {
1071                        local_irq_disable();
1072                        LIST(tmp, hostdata->issue_queue);
1073                        SET_NEXT(tmp, hostdata->issue_queue);
1074                        hostdata->issue_queue = tmp;
1075#ifdef SUPPORT_TAGS
1076                        cmd_free_tag( tmp );
1077#endif
1078                        local_irq_restore(flags);
1079                        MAIN_PRINTK("scsi%d: main(): select() failed, "
1080                                    "returned to issue_queue\n", HOSTNO);
1081                        if (hostdata->connected)
1082                            break;
1083                    }
1084                } /* if target/lun/target queue is not busy */
1085            } /* for issue_queue */
1086        } /* if (!hostdata->connected) */
1087        if (hostdata->connected 
1088#ifdef REAL_DMA
1089            && !hostdata->dma_len
1090#endif
1091            ) {
1092            local_irq_restore(flags);
1093            MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1094                        HOSTNO);
1095            NCR5380_information_transfer(instance);
1096            MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1097            done = 0;
1098        }
1099    } while (!done);
1100
1101    /* Better allow ints _after_ 'main_running' has been cleared, else
1102       an interrupt could believe we'll pick up the work it left for
1103       us, but we won't see it anymore here... */
1104    main_running = 0;
1105    local_irq_restore(flags);
1106}
1107
1108
1109#ifdef REAL_DMA
1110/*
1111 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1112 *
1113 * Purpose : Called by interrupt handler when DMA finishes or a phase
1114 *      mismatch occurs (which would finish the DMA transfer).  
1115 *
1116 * Inputs : instance - this instance of the NCR5380.
1117 *
1118 */
1119
1120static void NCR5380_dma_complete( struct Scsi_Host *instance )
1121{
1122    SETUP_HOSTDATA(instance);
1123    int           transfered;
1124    unsigned char **data;
1125    volatile int  *count;
1126
1127    if (!hostdata->connected) {
1128        printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1129               "no connected cmd\n", HOSTNO);
1130        return;
1131    }
1132
1133    DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1134               HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1135               NCR5380_read(STATUS_REG));
1136
1137    if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
1138            printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO);
1139            printk("please e-mail sammy@sammy.net with a description of how this\n");
1140            printk("error was produced.\n");
1141            BUG();
1142    }
1143
1144    /* make sure we're not stuck in a data phase */
1145    if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH |
1146                                            BASR_ACK)) ==
1147       (BASR_PHASE_MATCH | BASR_ACK)) {
1148            printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG));
1149            printk("scsi%d: bus stuck in data phase -- probably a single byte "
1150                   "overrun!\n", HOSTNO);
1151            printk("not prepared for this error!\n");
1152            printk("please e-mail sammy@sammy.net with a description of how this\n");
1153            printk("error was produced.\n");
1154            BUG();
1155    }
1156
1157
1158
1159    (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1160    NCR5380_write(MODE_REG, MR_BASE);
1161    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1162
1163    transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1164    hostdata->dma_len = 0;
1165
1166    data = (unsigned char **) &(hostdata->connected->SCp.ptr);
1167    count = &(hostdata->connected->SCp.this_residual);
1168    *data += transfered;
1169    *count -= transfered;
1170
1171}
1172#endif /* REAL_DMA */
1173
1174
1175/*
1176 * Function : void NCR5380_intr (int irq)
1177 * 
1178 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
1179 *      from the disconnected queue, and restarting NCR5380_main() 
1180 *      as required.
1181 *
1182 * Inputs : int irq, irq that caused this interrupt.
1183 *
1184 */
1185
1186static irqreturn_t NCR5380_intr (int irq, void *dev_id)
1187{
1188    struct Scsi_Host *instance = first_instance;
1189    int done = 1, handled = 0;
1190    unsigned char basr;
1191
1192    INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
1193
1194    /* Look for pending interrupts */
1195    basr = NCR5380_read(BUS_AND_STATUS_REG);
1196    INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1197    /* dispatch to appropriate routine if found and done=0 */
1198    if (basr & BASR_IRQ) {
1199        NCR_PRINT(NDEBUG_INTR);
1200        if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1201            done = 0;
1202//          ENABLE_IRQ();
1203            INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1204            NCR5380_reselect(instance);
1205            (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1206        }
1207        else if (basr & BASR_PARITY_ERROR) {
1208            INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1209            (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1210        }
1211        else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1212            INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1213            (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1214        }
1215        else {
1216            /*  
1217             * The rest of the interrupt conditions can occur only during a
1218             * DMA transfer
1219             */
1220
1221#if defined(REAL_DMA)
1222            /*
1223             * We should only get PHASE MISMATCH and EOP interrupts if we have
1224             * DMA enabled, so do a sanity check based on the current setting
1225             * of the MODE register.
1226             */
1227
1228            if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1229                ((basr & BASR_END_DMA_TRANSFER) || 
1230                 !(basr & BASR_PHASE_MATCH))) {
1231                    
1232                INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1233                NCR5380_dma_complete( instance );
1234                done = 0;
1235//              ENABLE_IRQ();
1236            } else
1237#endif /* REAL_DMA */
1238            {
1239/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
1240                if (basr & BASR_PHASE_MATCH)
1241                   INT_PRINTK("scsi%d: unknown interrupt, "
1242                           "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1243                           HOSTNO, basr, NCR5380_read(MODE_REG),
1244                           NCR5380_read(STATUS_REG));
1245                (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1246#ifdef SUN3_SCSI_VME
1247                dregs->csr |= CSR_DMA_ENABLE;
1248#endif
1249            }
1250        } /* if !(SELECTION || PARITY) */
1251        handled = 1;
1252    } /* BASR & IRQ */
1253    else {
1254
1255        printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1256               "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1257               NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1258        (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1259#ifdef SUN3_SCSI_VME
1260                dregs->csr |= CSR_DMA_ENABLE;
1261#endif
1262    }
1263    
1264    if (!done) {
1265        INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1266        /* Put a call to NCR5380_main() on the queue... */
1267        queue_main();
1268    }
1269    return IRQ_RETVAL(handled);
1270}
1271
1272#ifdef NCR5380_STATS
1273static void collect_stats(struct NCR5380_hostdata *hostdata,
1274                          struct scsi_cmnd *cmd)
1275{
1276# ifdef NCR5380_STAT_LIMIT
1277    if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
1278# endif
1279        switch (cmd->cmnd[0])
1280        {
1281            case WRITE:
1282            case WRITE_6:
1283            case WRITE_10:
1284                hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1285                /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
1286                hostdata->pendingw--;
1287                break;
1288            case READ:
1289            case READ_6:
1290            case READ_10:
1291                hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1292                /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
1293                hostdata->pendingr--;
1294                break;
1295        }
1296}
1297#endif
1298
1299/* 
1300 * Function : int NCR5380_select(struct Scsi_Host *instance,
1301 *                               struct scsi_cmnd *cmd, int tag);
1302 *
1303 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
1304 *      including ARBITRATION, SELECTION, and initial message out for 
1305 *      IDENTIFY and queue messages. 
1306 *
1307 * Inputs : instance - instantiation of the 5380 driver on which this 
1308 *      target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for 
1309 *      new tag, TAG_NONE for untagged queueing, otherwise set to the tag for 
1310 *      the command that is presently connected.
1311 * 
1312 * Returns : -1 if selection could not execute for some reason,
1313 *      0 if selection succeeded or failed because the target 
1314 *      did not respond.
1315 *
1316 * Side effects : 
1317 *      If bus busy, arbitration failed, etc, NCR5380_select() will exit 
1318 *              with registers as they should have been on entry - ie
1319 *              SELECT_ENABLE will be set appropriately, the NCR5380
1320 *              will cease to drive any SCSI bus signals.
1321 *
1322 *      If successful : I_T_L or I_T_L_Q nexus will be established, 
1323 *              instance->connected will be set to cmd.  
1324 *              SELECT interrupt will be disabled.
1325 *
1326 *      If failed (no target) : cmd->scsi_done() will be called, and the 
1327 *              cmd->result host byte set to DID_BAD_TARGET.
1328 */
1329
1330static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd,
1331                          int tag)
1332{
1333    SETUP_HOSTDATA(instance);
1334    unsigned char tmp[3], phase;
1335    unsigned char *data;
1336    int len;
1337    unsigned long timeout;
1338    unsigned long flags;
1339
1340    hostdata->restart_select = 0;
1341    NCR_PRINT(NDEBUG_ARBITRATION);
1342    ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1343               instance->this_id);
1344
1345    /* 
1346     * Set the phase bits to 0, otherwise the NCR5380 won't drive the 
1347     * data bus during SELECTION.
1348     */
1349
1350    local_irq_save(flags);
1351    if (hostdata->connected) {
1352        local_irq_restore(flags);
1353        return -1;
1354    }
1355    NCR5380_write(TARGET_COMMAND_REG, 0);
1356
1357
1358    /* 
1359     * Start arbitration.
1360     */
1361    
1362    NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1363    NCR5380_write(MODE_REG, MR_ARBITRATE);
1364
1365    local_irq_restore(flags);
1366
1367    /* Wait for arbitration logic to complete */
1368#ifdef NCR_TIMEOUT
1369    {
1370      unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
1371
1372      while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1373           && time_before(jiffies, timeout) && !hostdata->connected)
1374        ;
1375      if (time_after_eq(jiffies, timeout))
1376      {
1377        printk("scsi : arbitration timeout at %d\n", __LINE__);
1378        NCR5380_write(MODE_REG, MR_BASE);
1379        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1380        return -1;
1381      }
1382    }
1383#else /* NCR_TIMEOUT */
1384    while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
1385         && !hostdata->connected);
1386#endif
1387
1388    ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
1389
1390    if (hostdata->connected) {
1391        NCR5380_write(MODE_REG, MR_BASE); 
1392        return -1;
1393    }
1394    /* 
1395     * The arbitration delay is 2.2us, but this is a minimum and there is 
1396     * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1397     * the integral nature of udelay().
1398     *
1399     */
1400
1401    udelay(3);
1402
1403    /* Check for lost arbitration */
1404    if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1405        (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1406        (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1407        hostdata->connected) {
1408        NCR5380_write(MODE_REG, MR_BASE); 
1409        ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1410                   HOSTNO);
1411        return -1;
1412    }
1413
1414     /* after/during arbitration, BSY should be asserted.
1415        IBM DPES-31080 Version S31Q works now */
1416     /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1417    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL |
1418                                         ICR_ASSERT_BSY ) ;
1419    
1420    if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1421        hostdata->connected) {
1422        NCR5380_write(MODE_REG, MR_BASE);
1423        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1424        ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1425                   HOSTNO);
1426        return -1;
1427    }
1428
1429    /* 
1430     * Again, bus clear + bus settle time is 1.2us, however, this is 
1431     * a minimum so we'll udelay ceil(1.2)
1432     */
1433
1434#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
1435    /* ++roman: But some targets (see above :-) seem to need a bit more... */
1436    udelay(15);
1437#else
1438    udelay(2);
1439#endif
1440    
1441    if (hostdata->connected) {
1442        NCR5380_write(MODE_REG, MR_BASE);
1443        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1444        return -1;
1445    }
1446
1447    ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1448
1449    /* 
1450     * Now that we have won arbitration, start Selection process, asserting 
1451     * the host and target ID's on the SCSI bus.
1452     */
1453
1454    NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1455
1456    /* 
1457     * Raise ATN while SEL is true before BSY goes false from arbitration,
1458     * since this is the only way to guarantee that we'll get a MESSAGE OUT
1459     * phase immediately after selection.
1460     */
1461
1462    NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | 
1463        ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
1464    NCR5380_write(MODE_REG, MR_BASE);
1465
1466    /* 
1467     * Reselect interrupts must be turned off prior to the dropping of BSY,
1468     * otherwise we will trigger an interrupt.
1469     */
1470
1471    if (hostdata->connected) {
1472        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1473        return -1;
1474    }
1475
1476    NCR5380_write(SELECT_ENABLE_REG, 0);
1477
1478    /*
1479     * The initiator shall then wait at least two deskew delays and release 
1480     * the BSY signal.
1481     */
1482    udelay(1);        /* wingel -- wait two bus deskew delay >2*45ns */
1483
1484    /* Reset BSY */
1485    NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | 
1486        ICR_ASSERT_ATN | ICR_ASSERT_SEL));
1487
1488    /* 
1489     * Something weird happens when we cease to drive BSY - looks
1490     * like the board/chip is letting us do another read before the 
1491     * appropriate propagation delay has expired, and we're confusing
1492     * a BSY signal from ourselves as the target's response to SELECTION.
1493     *
1494     * A small delay (the 'C++' frontend breaks the pipeline with an
1495     * unnecessary jump, making it work on my 386-33/Trantor T128, the
1496     * tighter 'C' code breaks and requires this) solves the problem - 
1497     * the 1 us delay is arbitrary, and only used because this delay will 
1498     * be the same on other platforms and since it works here, it should 
1499     * work there.
1500     *
1501     * wingel suggests that this could be due to failing to wait
1502     * one deskew delay.
1503     */
1504
1505    udelay(1);
1506
1507    SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
1508
1509    /* 
1510     * The SCSI specification calls for a 250 ms timeout for the actual 
1511     * selection.
1512     */
1513
1514    timeout = jiffies + 25; 
1515
1516    /* 
1517     * XXX very interesting - we're seeing a bounce where the BSY we 
1518     * asserted is being reflected / still asserted (propagation delay?)
1519     * and it's detecting as true.  Sigh.
1520     */
1521
1522#if 0
1523    /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1524     * IO while SEL is true. But again, there are some disks out the in the
1525     * world that do that nevertheless. (Somebody claimed that this announces
1526     * reselection capability of the target.) So we better skip that test and
1527     * only wait for BSY... (Famous german words: Der Kl├╝gere gibt nach :-)
1528     */
1529
1530    while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & 
1531        (SR_BSY | SR_IO)));
1532
1533    if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == 
1534            (SR_SEL | SR_IO)) {
1535            NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1536            NCR5380_reselect(instance);
1537            printk (KERN_ERR "scsi%d: reselection after won arbitration?\n",
1538                    HOSTNO);
1539            NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1540            return -1;
1541    }
1542#else
1543    while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY));
1544#endif
1545
1546    /* 
1547     * No less than two deskew delays after the initiator detects the 
1548     * BSY signal is true, it shall release the SEL signal and may 
1549     * change the DATA BUS.                                     -wingel
1550     */
1551
1552    udelay(1);
1553
1554    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1555
1556    if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1557        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1558        if (hostdata->targets_present & (1 << cmd->device->id)) {
1559            printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1560            if (hostdata->restart_select)
1561                printk(KERN_NOTICE "\trestart select\n");
1562            NCR_PRINT(NDEBUG_ANY);
1563            NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1564            return -1;
1565        }
1566        cmd->result = DID_BAD_TARGET << 16;
1567#ifdef NCR5380_STATS
1568        collect_stats(hostdata, cmd);
1569#endif
1570#ifdef SUPPORT_TAGS
1571        cmd_free_tag( cmd );
1572#endif
1573        cmd->scsi_done(cmd);
1574        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1575        SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1576        NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1577        return 0;
1578    } 
1579
1580    hostdata->targets_present |= (1 << cmd->device->id);
1581
1582    /*
1583     * Since we followed the SCSI spec, and raised ATN while SEL 
1584     * was true but before BSY was false during selection, the information
1585     * transfer phase should be a MESSAGE OUT phase so that we can send the
1586     * IDENTIFY message.
1587     * 
1588     * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1589     * message (2 bytes) with a tag ID that we increment with every command
1590     * until it wraps back to 0.
1591     *
1592     * XXX - it turns out that there are some broken SCSI-II devices,
1593     *       which claim to support tagged queuing but fail when more than
1594     *       some number of commands are issued at once.
1595     */
1596
1597    /* Wait for start of REQ/ACK handshake */
1598    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
1599
1600    SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1601               HOSTNO, cmd->device->id);
1602    tmp[0] = IDENTIFY(1, cmd->device->lun);
1603
1604#ifdef SUPPORT_TAGS
1605    if (cmd->tag != TAG_NONE) {
1606        tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1607        tmp[2] = cmd->tag;
1608        len = 3;
1609    } else 
1610        len = 1;
1611#else
1612    len = 1;
1613    cmd->tag=0;
1614#endif /* SUPPORT_TAGS */
1615
1616    /* Send message(s) */
1617    data = tmp;
1618    phase = PHASE_MSGOUT;
1619    NCR5380_transfer_pio(instance, &phase, &len, &data);
1620    SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1621    /* XXX need to handle errors here */
1622    hostdata->connected = cmd;
1623#ifndef SUPPORT_TAGS
1624    hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1625#endif    
1626#ifdef SUN3_SCSI_VME
1627    dregs->csr |= CSR_INTR;
1628#endif
1629    initialize_SCp(cmd);
1630
1631
1632    return 0;
1633}
1634
1635/* 
1636 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, 
1637 *      unsigned char *phase, int *count, unsigned char **data)
1638 *
1639 * Purpose : transfers data in given phase using polled I/O
1640 *
1641 * Inputs : instance - instance of driver, *phase - pointer to 
1642 *      what phase is expected, *count - pointer to number of 
1643 *      bytes to transfer, **data - pointer to data pointer.
1644 * 
1645 * Returns : -1 when different phase is entered without transferring
1646 *      maximum number of bytes, 0 if all bytes are transferred or exit
1647 *      is in same phase.
1648 *
1649 *      Also, *phase, *count, *data are modified in place.
1650 *
1651 * XXX Note : handling for bus free may be useful.
1652 */
1653
1654/*
1655 * Note : this code is not as quick as it could be, however it 
1656 * IS 100% reliable, and for the actual data transfer where speed
1657 * counts, we will always do a pseudo DMA or DMA transfer.
1658 */
1659
1660static int NCR5380_transfer_pio( struct Scsi_Host *instance, 
1661                                 unsigned char *phase, int *count,
1662                                 unsigned char **data)
1663{
1664    register unsigned char p = *phase, tmp;
1665    register int c = *count;
1666    register unsigned char *d = *data;
1667
1668    /* 
1669     * The NCR5380 chip will only drive the SCSI bus when the 
1670     * phase specified in the appropriate bits of the TARGET COMMAND
1671     * REGISTER match the STATUS REGISTER
1672     */
1673
1674    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1675
1676    do {
1677        /* 
1678         * Wait for assertion of REQ, after which the phase bits will be 
1679         * valid 
1680         */
1681        while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1682
1683        HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
1684
1685        /* Check for phase mismatch */  
1686        if ((tmp & PHASE_MASK) != p) {
1687            PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1688            NCR_PRINT_PHASE(NDEBUG_PIO);
1689            break;
1690        }
1691
1692        /* Do actual transfer from SCSI bus to / from memory */
1693        if (!(p & SR_IO)) 
1694            NCR5380_write(OUTPUT_DATA_REG, *d);
1695        else 
1696            *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1697
1698        ++d;
1699
1700        /* 
1701         * The SCSI standard suggests that in MSGOUT phase, the initiator
1702         * should drop ATN on the last byte of the message phase
1703         * after REQ has been asserted for the handshake but before
1704         * the initiator raises ACK.
1705         */
1706
1707        if (!(p & SR_IO)) {
1708            if (!((p & SR_MSG) && c > 1)) {
1709                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1710                    ICR_ASSERT_DATA);
1711                NCR_PRINT(NDEBUG_PIO);
1712                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1713                        ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1714            } else {
1715                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1716                    ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1717                NCR_PRINT(NDEBUG_PIO);
1718                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1719                    ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1720            }
1721        } else {
1722            NCR_PRINT(NDEBUG_PIO);
1723            NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1724        }
1725
1726        while (NCR5380_read(STATUS_REG) & SR_REQ);
1727
1728        HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1729
1730/*
1731 * We have several special cases to consider during REQ/ACK handshaking : 
1732 * 1.  We were in MSGOUT phase, and we are on the last byte of the 
1733 *      message.  ATN must be dropped as ACK is dropped.
1734 *
1735 * 2.  We are in a MSGIN phase, and we are on the last byte of the  
1736 *      message.  We must exit with ACK asserted, so that the calling
1737 *      code may raise ATN before dropping ACK to reject the message.
1738 *
1739 * 3.  ACK and ATN are clear and the target may proceed as normal.
1740 */
1741        if (!(p == PHASE_MSGIN && c == 1)) {  
1742            if (p == PHASE_MSGOUT && c > 1)
1743                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1744            else
1745                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1746        } 
1747    } while (--c);
1748
1749    PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1750
1751    *count = c;
1752    *data = d;
1753    tmp = NCR5380_read(STATUS_REG);
1754    /* The phase read from the bus is valid if either REQ is (already)
1755     * asserted or if ACK hasn't been released yet. The latter is the case if
1756     * we're in MSGIN and all wanted bytes have been received. */
1757    if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1758        *phase = tmp & PHASE_MASK;
1759    else 
1760        *phase = PHASE_UNKNOWN;
1761
1762    if (!c || (*phase == p))
1763        return 0;
1764    else 
1765        return -1;
1766}
1767
1768/*
1769 * Function : do_abort (Scsi_Host *host)
1770 * 
1771 * Purpose : abort the currently established nexus.  Should only be 
1772 *      called from a routine which can drop into a 
1773 * 
1774 * Returns : 0 on success, -1 on failure.
1775 */
1776
1777static int do_abort (struct Scsi_Host *host) 
1778{
1779    unsigned char tmp, *msgptr, phase;
1780    int len;
1781
1782    /* Request message out phase */
1783    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1784
1785    /* 
1786     * Wait for the target to indicate a valid phase by asserting 
1787     * REQ.  Once this happens, we'll have either a MSGOUT phase 
1788     * and can immediately send the ABORT message, or we'll have some 
1789     * other phase and will have to source/sink data.
1790     * 
1791     * We really don't care what value was on the bus or what value
1792     * the target sees, so we just handshake.
1793     */
1794    
1795    while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
1796
1797    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1798
1799    if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1800        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 
1801                      ICR_ASSERT_ACK);
1802        while (NCR5380_read(STATUS_REG) & SR_REQ);
1803        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1804    }
1805   
1806    tmp = ABORT;
1807    msgptr = &tmp;
1808    len = 1;
1809    phase = PHASE_MSGOUT;
1810    NCR5380_transfer_pio (host, &phase, &len, &msgptr);
1811
1812    /*
1813     * If we got here, and the command completed successfully,
1814     * we're about to go into bus free state.
1815     */
1816
1817    return len ? -1 : 0;
1818}
1819
1820#if defined(REAL_DMA)
1821/* 
1822 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, 
1823 *      unsigned char *phase, int *count, unsigned char **data)
1824 *
1825 * Purpose : transfers data in given phase using either real
1826 *      or pseudo DMA.
1827 *
1828 * Inputs : instance - instance of driver, *phase - pointer to 
1829 *      what phase is expected, *count - pointer to number of 
1830 *      bytes to transfer, **data - pointer to data pointer.
1831 * 
1832 * Returns : -1 when different phase is entered without transferring
1833 *      maximum number of bytes, 0 if all bytes or transferred or exit
1834 *      is in same phase.
1835 *
1836 *      Also, *phase, *count, *data are modified in place.
1837 *
1838 */
1839
1840
1841static int NCR5380_transfer_dma( struct Scsi_Host *instance, 
1842                                 unsigned char *phase, int *count,
1843                                 unsigned char **data)
1844{
1845    SETUP_HOSTDATA(instance);
1846    register int c = *count;
1847    register unsigned char p = *phase;
1848    unsigned long flags;
1849
1850    /* sanity check */
1851    if(!sun3_dma_setup_done) {
1852         printk("scsi%d: transfer_dma without setup!\n", HOSTNO);
1853         BUG();
1854    }
1855    hostdata->dma_len = c;
1856
1857    DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1858               HOSTNO, (p & SR_IO) ? "reading" : "writing",
1859               c, (p & SR_IO) ? "to" : "from", *data);
1860
1861    /* netbsd turns off ints here, why not be safe and do it too */
1862    local_irq_save(flags);
1863    
1864    /* send start chain */
1865    sun3scsi_dma_start(c, *data);
1866    
1867    if (p & SR_IO) {
1868            NCR5380_write(TARGET_COMMAND_REG, 1);
1869            NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1870            NCR5380_write(INITIATOR_COMMAND_REG, 0);
1871            NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1872            NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1873    } else {
1874            NCR5380_write(TARGET_COMMAND_REG, 0);
1875            NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1876            NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA);
1877            NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR));
1878            NCR5380_write(START_DMA_SEND_REG, 0);
1879    }
1880
1881#ifdef SUN3_SCSI_VME
1882    dregs->csr |= CSR_DMA_ENABLE;
1883#endif
1884
1885    local_irq_restore(flags);
1886
1887    sun3_dma_active = 1;
1888    return 0;
1889}
1890#endif /* defined(REAL_DMA) */
1891
1892/*
1893 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1894 *
1895 * Purpose : run through the various SCSI phases and do as the target 
1896 *      directs us to.  Operates on the currently connected command, 
1897 *      instance->connected.
1898 *
1899 * Inputs : instance, instance for which we are doing commands
1900 *
1901 * Side effects : SCSI things happen, the disconnected queue will be 
1902 *      modified if a command disconnects, *instance->connected will
1903 *      change.
1904 *
1905 * XXX Note : we need to watch for bus free or a reset condition here 
1906 *      to recover from an unexpected bus free condition.
1907 */
1908 
1909static void NCR5380_information_transfer (struct Scsi_Host *instance)
1910{
1911    SETUP_HOSTDATA(instance);
1912    unsigned long flags;
1913    unsigned char msgout = NOP;
1914    int sink = 0;
1915    int len;
1916#if defined(REAL_DMA)
1917    int transfersize;
1918#endif
1919    unsigned char *data;
1920    unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
1921    struct scsi_cmnd *cmd = (struct scsi_cmnd *) hostdata->connected;
1922
1923#ifdef SUN3_SCSI_VME
1924    dregs->csr |= CSR_INTR;
1925#endif
1926
1927    while (1) {
1928        tmp = NCR5380_read(STATUS_REG);
1929        /* We only have a valid SCSI phase when REQ is asserted */
1930        if (tmp & SR_REQ) {
1931            phase = (tmp & PHASE_MASK); 
1932            if (phase != old_phase) {
1933                old_phase = phase;
1934                NCR_PRINT_PHASE(NDEBUG_INFORMATION);
1935            }
1936
1937            if(phase == PHASE_CMDOUT) {
1938                    void *d;
1939                    unsigned long count;
1940
1941                if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1942                        count = cmd->SCp.buffer->length;
1943                        d = SGADDR(cmd->SCp.buffer);
1944                } else {
1945                        count = cmd->SCp.this_residual;
1946                        d = cmd->SCp.ptr;
1947                }
1948#ifdef REAL_DMA
1949                /* this command setup for dma yet? */
1950                if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done
1951                                                  != cmd))
1952                {
1953                        if (cmd->request->cmd_type == REQ_TYPE_FS) {
1954                                sun3scsi_dma_setup(d, count,
1955                                                   rq_data_dir(cmd->request));
1956                                sun3_dma_setup_done = cmd;
1957                        }
1958                }
1959#endif
1960#ifdef SUN3_SCSI_VME
1961                dregs->csr |= CSR_INTR;
1962#endif
1963            }
1964
1965            
1966            if (sink && (phase != PHASE_MSGOUT)) {
1967                NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1968
1969                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | 
1970                    ICR_ASSERT_ACK);
1971                while (NCR5380_read(STATUS_REG) & SR_REQ);
1972                NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
1973                    ICR_ASSERT_ATN);
1974                sink = 0;
1975                continue;
1976            }
1977
1978            switch (phase) {
1979            case PHASE_DATAOUT:
1980#if (NDEBUG & NDEBUG_NO_DATAOUT)
1981                printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
1982                       "aborted\n", HOSTNO);
1983                sink = 1;
1984                do_abort(instance);
1985                cmd->result = DID_ERROR  << 16;
1986                cmd->scsi_done(cmd);
1987                return;
1988#endif
1989            case PHASE_DATAIN:
1990                /* 
1991                 * If there is no room left in the current buffer in the
1992                 * scatter-gather list, move onto the next one.
1993                 */
1994                if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1995                    ++cmd->SCp.buffer;
1996                    --cmd->SCp.buffers_residual;
1997                    cmd->SCp.this_residual = cmd->SCp.buffer->length;
1998                    cmd->SCp.ptr = SGADDR(cmd->SCp.buffer);
1999                    INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2000                               HOSTNO, cmd->SCp.this_residual,
2001                               cmd->SCp.buffers_residual);
2002                }
2003
2004                /*
2005                 * The preferred transfer method is going to be 
2006                 * PSEUDO-DMA for systems that are strictly PIO,
2007                 * since we can let the hardware do the handshaking.
2008                 *
2009                 * For this to work, we need to know the transfersize
2010                 * ahead of time, since the pseudo-DMA code will sit
2011                 * in an unconditional loop.
2012                 */
2013
2014/* ++roman: I suggest, this should be
2015 *   #if def(REAL_DMA)
2016 * instead of leaving REAL_DMA out.
2017 */
2018
2019#if defined(REAL_DMA)
2020//              if (!cmd->device->borken &&
2021                if((transfersize =
2022                    NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) {
2023                    len = transfersize;
2024                    cmd->SCp.phase = phase;
2025
2026                    if (NCR5380_transfer_dma(instance, &phase,
2027                        &len, (unsigned char **) &cmd->SCp.ptr)) {
2028                        /*
2029                         * If the watchdog timer fires, all future
2030                         * accesses to this device will use the
2031                         * polled-IO. */ 
2032                        printk(KERN_NOTICE "scsi%d: switching target %d "
2033                               "lun %d to slow handshake\n", HOSTNO,
2034                               cmd->device->id, cmd->device->lun);
2035                        cmd->device->borken = 1;
2036                        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
2037                            ICR_ASSERT_ATN);
2038                        sink = 1;
2039                        do_abort(instance);
2040                        cmd->result = DID_ERROR  << 16;
2041                        cmd->scsi_done(cmd);
2042                        /* XXX - need to source or sink data here, as appropriate */
2043                    } else {
2044#ifdef REAL_DMA
2045                        /* ++roman: When using real DMA,
2046                         * information_transfer() should return after
2047                         * starting DMA since it has nothing more to
2048                         * do.
2049                         */
2050                                    return;
2051#else                   
2052                        cmd->SCp.this_residual -= transfersize - len;
2053#endif
2054                    }
2055                } else 
2056#endif /* defined(REAL_DMA) */
2057                  NCR5380_transfer_pio(instance, &phase, 
2058                    (int *) &cmd->SCp.this_residual, (unsigned char **)
2059                    &cmd->SCp.ptr);
2060#ifdef REAL_DMA
2061                /* if we had intended to dma that command clear it */
2062                if(sun3_dma_setup_done == cmd)
2063                        sun3_dma_setup_done = NULL;
2064#endif
2065
2066                break;
2067            case PHASE_MSGIN:
2068                len = 1;
2069                data = &tmp;
2070                NCR5380_write(SELECT_ENABLE_REG, 0);    /* disable reselects */
2071                NCR5380_transfer_pio(instance, &phase, &len, &data);
2072                cmd->SCp.Message = tmp;
2073                
2074                switch (tmp) {
2075                /*
2076                 * Linking lets us reduce the time required to get the 
2077                 * next command out to the device, hopefully this will
2078                 * mean we don't waste another revolution due to the delays
2079                 * required by ARBITRATION and another SELECTION.
2080                 *
2081                 * In the current implementation proposal, low level drivers
2082                 * merely have to start the next command, pointed to by 
2083                 * next_link, done() is called as with unlinked commands.
2084                 */
2085#ifdef LINKED
2086                case LINKED_CMD_COMPLETE:
2087                case LINKED_FLG_CMD_COMPLETE:
2088                    /* Accept message by clearing ACK */
2089                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2090                    
2091                    LNK_PRINTK("scsi%d: target %d lun %d linked command "
2092                               "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2093
2094                    /* Enable reselect interrupts */
2095                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2096                    /*
2097                     * Sanity check : A linked command should only terminate
2098                     * with one of these messages if there are more linked
2099                     * commands available.
2100                     */
2101
2102                    if (!cmd->next_link) {
2103                         printk(KERN_NOTICE "scsi%d: target %d lun %d "
2104                                "linked command complete, no next_link\n",
2105                                HOSTNO, cmd->device->id, cmd->device->lun);
2106                            sink = 1;
2107                            do_abort (instance);
2108                            return;
2109                    }
2110
2111                    initialize_SCp(cmd->next_link);
2112                    /* The next command is still part of this process; copy it
2113                     * and don't free it! */
2114                    cmd->next_link->tag = cmd->tag;
2115                    cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 
2116                    LNK_PRINTK("scsi%d: target %d lun %d linked request "
2117                               "done, calling scsi_done().\n",
2118                               HOSTNO, cmd->device->id, cmd->device->lun);
2119#ifdef NCR5380_STATS
2120                    collect_stats(hostdata, cmd);
2121#endif
2122                    cmd->scsi_done(cmd);
2123                    cmd = hostdata->connected;
2124                    break;
2125#endif /* def LINKED */
2126                case ABORT:
2127                case COMMAND_COMPLETE: 
2128                    /* Accept message by clearing ACK */
2129                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2130                    hostdata->connected = NULL;
2131                    QU_PRINTK("scsi%d: command for target %d, lun %d "
2132                              "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2133#ifdef SUPPORT_TAGS
2134                    cmd_free_tag( cmd );
2135                    if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2136                        /* Turn a QUEUE FULL status into BUSY, I think the
2137                         * mid level cannot handle QUEUE FULL :-( (The
2138                         * command is retried after BUSY). Also update our
2139                         * queue size to the number of currently issued
2140                         * commands now.
2141                         */
2142                        /* ++Andreas: the mid level code knows about
2143                           QUEUE_FULL now. */
2144                        TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2145                        TAG_PRINTK("scsi%d: target %d lun %d returned "
2146                                   "QUEUE_FULL after %d commands\n",
2147                                   HOSTNO, cmd->device->id, cmd->device->lun,
2148                                   ta->nr_allocated);
2149                        if (ta->queue_size > ta->nr_allocated)
2150                            ta->nr_allocated = ta->queue_size;
2151                    }
2152#else
2153                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2154#endif
2155                    /* Enable reselect interrupts */
2156                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2157
2158                    /* 
2159                     * I'm not sure what the correct thing to do here is : 
2160                     * 
2161                     * If the command that just executed is NOT a request 
2162                     * sense, the obvious thing to do is to set the result
2163                     * code to the values of the stored parameters.
2164                     * 
2165                     * If it was a REQUEST SENSE command, we need some way to
2166                     * differentiate between the failure code of the original
2167                     * and the failure code of the REQUEST sense - the obvious
2168                     * case is success, where we fall through and leave the
2169                     * result code unchanged.
2170                     * 
2171                     * The non-obvious place is where the REQUEST SENSE failed
2172                     */
2173
2174                    if (cmd->cmnd[0] != REQUEST_SENSE) 
2175                        cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); 
2176                    else if (status_byte(cmd->SCp.Status) != GOOD)
2177                        cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2178                    
2179#ifdef AUTOSENSE
2180                    if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2181                                                hostdata->ses.cmd_len) {
2182                        scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2183                        hostdata->ses.cmd_len = 0 ;
2184                    }
2185
2186                    if ((cmd->cmnd[0] != REQUEST_SENSE) && 
2187                        (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2188                        scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
2189                        ASEN_PRINTK("scsi%d: performing request sense\n",
2190                                    HOSTNO);
2191                        /* this is initialized from initialize_SCp 
2192                        cmd->SCp.buffer = NULL;
2193                        cmd->SCp.buffers_residual = 0;
2194                        */
2195
2196                        local_irq_save(flags);
2197                        LIST(cmd,hostdata->issue_queue);
2198                        SET_NEXT(cmd, hostdata->issue_queue);
2199                        hostdata->issue_queue = (struct scsi_cmnd *) cmd;
2200                        local_irq_restore(flags);
2201                        QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2202                                  "issue queue\n", H_NO(cmd));
2203                   } else
2204#endif /* def AUTOSENSE */
2205                   {
2206#ifdef NCR5380_STATS
2207                       collect_stats(hostdata, cmd);
2208#endif
2209                       cmd->scsi_done(cmd);
2210                    }
2211
2212                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2213                    /* 
2214                     * Restore phase bits to 0 so an interrupted selection, 
2215                     * arbitration can resume.
2216                     */
2217                    NCR5380_write(TARGET_COMMAND_REG, 0);
2218                    
2219                    while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2220                        barrier();
2221
2222                    return;
2223                case MESSAGE_REJECT:
2224                    /* Accept message by clearing ACK */
2225                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2226                    /* Enable reselect interrupts */
2227                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2228                    switch (hostdata->last_message) {
2229                    case HEAD_OF_QUEUE_TAG:
2230                    case ORDERED_QUEUE_TAG:
2231                    case SIMPLE_QUEUE_TAG:
2232                        /* The target obviously doesn't support tagged
2233                         * queuing, even though it announced this ability in
2234                         * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2235                         * clear 'tagged_supported' and lock the LUN, since
2236                         * the command is treated as untagged further on.
2237                         */
2238                        cmd->device->tagged_supported = 0;
2239                        hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2240                        cmd->tag = TAG_NONE;
2241                        TAG_PRINTK("scsi%d: target %d lun %d rejected "
2242                                   "QUEUE_TAG message; tagged queuing "
2243                                   "disabled\n",
2244                                   HOSTNO, cmd->device->id, cmd->device->lun);
2245                        break;
2246                    }
2247                    break;
2248                case DISCONNECT:
2249                    /* Accept message by clearing ACK */
2250                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2251                    local_irq_save(flags);
2252                    cmd->device->disconnect = 1;
2253                    LIST(cmd,hostdata->disconnected_queue);
2254                    SET_NEXT(cmd, hostdata->disconnected_queue);
2255                    hostdata->connected = NULL;
2256                    hostdata->disconnected_queue = cmd;
2257                    local_irq_restore(flags);
2258                    QU_PRINTK("scsi%d: command for target %d lun %d was "
2259                              "moved from connected to the "
2260                              "disconnected_queue\n", HOSTNO, 
2261                              cmd->device->id, cmd->device->lun);
2262                    /* 
2263                     * Restore phase bits to 0 so an interrupted selection, 
2264                     * arbitration can resume.
2265                     */
2266                    NCR5380_write(TARGET_COMMAND_REG, 0);
2267
2268                    /* Enable reselect interrupts */
2269                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2270                    /* Wait for bus free to avoid nasty timeouts */
2271                    while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2272                        barrier();
2273#ifdef SUN3_SCSI_VME
2274                    dregs->csr |= CSR_DMA_ENABLE;
2275#endif
2276                    return;
2277                /* 
2278                 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2279                 * operation, in violation of the SCSI spec so we can safely 
2280                 * ignore SAVE/RESTORE pointers calls.
2281                 *
2282                 * Unfortunately, some disks violate the SCSI spec and 
2283                 * don't issue the required SAVE_POINTERS message before
2284                 * disconnecting, and we have to break spec to remain 
2285                 * compatible.
2286                 */
2287                case SAVE_POINTERS:
2288                case RESTORE_POINTERS:
2289                    /* Accept message by clearing ACK */
2290                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2291                    /* Enable reselect interrupts */
2292                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2293                    break;
2294                case EXTENDED_MESSAGE:
2295/* 
2296 * Extended messages are sent in the following format :
2297 * Byte         
2298 * 0            EXTENDED_MESSAGE == 1
2299 * 1            length (includes one byte for code, doesn't 
2300 *              include first two bytes)
2301 * 2            code
2302 * 3..length+1  arguments
2303 *
2304 * Start the extended message buffer with the EXTENDED_MESSAGE
2305 * byte, since spi_print_msg() wants the whole thing.  
2306 */
2307                    extended_msg[0] = EXTENDED_MESSAGE;
2308                    /* Accept first byte by clearing ACK */
2309                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2310
2311                    EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2312
2313                    len = 2;
2314                    data = extended_msg + 1;
2315                    phase = PHASE_MSGIN;
2316                    NCR5380_transfer_pio(instance, &phase, &len, &data);
2317                    EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2318                               (int)extended_msg[1], (int)extended_msg[2]);
2319
2320                    if (!len && extended_msg[1] <= 
2321                        (sizeof (extended_msg) - 1)) {
2322                        /* Accept third byte by clearing ACK */
2323                        NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2324                        len = extended_msg[1] - 1;
2325                        data = extended_msg + 3;
2326                        phase = PHASE_MSGIN;
2327
2328                        NCR5380_transfer_pio(instance, &phase, &len, &data);
2329                        EXT_PRINTK("scsi%d: message received, residual %d\n",
2330                                   HOSTNO, len);
2331
2332                        switch (extended_msg[2]) {
2333                        case EXTENDED_SDTR:
2334                        case EXTENDED_WDTR:
2335                        case EXTENDED_MODIFY_DATA_POINTER:
2336                        case EXTENDED_EXTENDED_IDENTIFY:
2337                            tmp = 0;
2338                        }
2339                    } else if (len) {
2340                        printk(KERN_NOTICE "scsi%d: error receiving "
2341                               "extended message\n", HOSTNO);
2342                        tmp = 0;
2343                    } else {
2344                        printk(KERN_NOTICE "scsi%d: extended message "
2345                               "code %02x length %d is too long\n",
2346                               HOSTNO, extended_msg[2], extended_msg[1]);
2347                        tmp = 0;
2348                    }
2349                /* Fall through to reject message */
2350
2351                /* 
2352                 * If we get something weird that we aren't expecting, 
2353                 * reject it.
2354                 */
2355                default:
2356                    if (!tmp) {
2357                        printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2358                        spi_print_msg(extended_msg);
2359                        printk("\n");
2360                    } else if (tmp != EXTENDED_MESSAGE)
2361                        printk(KERN_DEBUG "scsi%d: rejecting unknown "
2362                               "message %02x from target %d, lun %d\n",
2363                               HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2364                    else
2365                        printk(KERN_DEBUG "scsi%d: rejecting unknown "
2366                               "extended message "
2367                               "code %02x, length %d from target %d, lun %d\n",
2368                               HOSTNO, extended_msg[1], extended_msg[0],
2369                               cmd->device->id, cmd->device->lun);
2370   
2371
2372                    msgout = MESSAGE_REJECT;
2373                    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | 
2374                        ICR_ASSERT_ATN);
2375                    break;
2376                } /* switch (tmp) */
2377                break;
2378            case PHASE_MSGOUT:
2379                len = 1;
2380                data = &msgout;
2381                hostdata->last_message = msgout;
2382                NCR5380_transfer_pio(instance, &phase, &len, &data);
2383                if (msgout == ABORT) {
2384#ifdef SUPPORT_TAGS
2385                    cmd_free_tag( cmd );
2386#else
2387                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2388#endif
2389                    hostdata->connected = NULL;
2390                    cmd->result = DID_ERROR << 16;
2391#ifdef NCR5380_STATS
2392                    collect_stats(hostdata, cmd);
2393#endif
2394                    cmd->scsi_done(cmd);
2395                    NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2396                    return;
2397                }
2398                msgout = NOP;
2399                break;
2400            case PHASE_CMDOUT:
2401                len = cmd->cmd_len;
2402                data = cmd->cmnd;
2403                /* 
2404                 * XXX for performance reasons, on machines with a 
2405                 * PSEUDO-DMA architecture we should probably 
2406                 * use the dma transfer function.  
2407                 */
2408                NCR5380_transfer_pio(instance, &phase, &len, 
2409                    &data);
2410                break;
2411            case PHASE_STATIN:
2412                len = 1;
2413                data = &tmp;
2414                NCR5380_transfer_pio(instance, &phase, &len, &data);
2415                cmd->SCp.Status = tmp;
2416                break;
2417            default:
2418                printk("scsi%d: unknown phase\n", HOSTNO);
2419                NCR_PRINT(NDEBUG_ANY);
2420            } /* switch(phase) */
2421        } /* if (tmp * SR_REQ) */ 
2422    } /* while (1) */
2423}
2424
2425/*
2426 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2427 *
2428 * Purpose : does reselection, initializing the instance->connected 
2429 *      field to point to the struct scsi_cmnd for which the I_T_L or I_T_L_Q
2430 *      nexus has been reestablished,
2431 *      
2432 * Inputs : instance - this instance of the NCR5380.
2433 *
2434 */
2435
2436/* it might eventually prove necessary to do a dma setup on
2437   reselection, but it doesn't seem to be needed now -- sam */
2438
2439static void NCR5380_reselect (struct Scsi_Host *instance)
2440{
2441    SETUP_HOSTDATA(instance);
2442    unsigned char target_mask;
2443    unsigned char lun;
2444#ifdef SUPPORT_TAGS
2445    unsigned char tag;
2446#endif
2447    unsigned char msg[3];
2448    struct scsi_cmnd *tmp = NULL, *prev;
2449/*    unsigned long flags; */
2450
2451    /*
2452     * Disable arbitration, etc. since the host adapter obviously
2453     * lost, and tell an interrupted NCR5380_select() to restart.
2454     */
2455
2456    NCR5380_write(MODE_REG, MR_BASE);
2457    hostdata->restart_select = 1;
2458
2459    target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2460
2461    RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2462
2463    /* 
2464     * At this point, we have detected that our SCSI ID is on the bus,
2465     * SEL is true and BSY was false for at least one bus settle delay
2466     * (400 ns).
2467     *
2468     * We must assert BSY ourselves, until the target drops the SEL
2469     * signal.
2470     */
2471
2472    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2473    
2474    while (NCR5380_read(STATUS_REG) & SR_SEL);
2475    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2476
2477    /*
2478     * Wait for target to go into MSGIN.
2479     */
2480
2481    while (!(NCR5380_read(STATUS_REG) & SR_REQ));
2482
2483#if 1
2484    // acknowledge toggle to MSGIN
2485    NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
2486
2487    // peek at the byte without really hitting the bus
2488    msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2489#endif
2490
2491    if (!(msg[0] & 0x80)) {
2492        printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2493        spi_print_msg(msg);
2494        do_abort(instance);
2495        return;
2496    }
2497    lun = (msg[0] & 0x07);
2498
2499    /* 
2500     * Find the command corresponding to the I_T_L or I_T_L_Q  nexus we 
2501     * just reestablished, and remove it from the disconnected queue.
2502     */
2503
2504    for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue, prev = NULL;
2505         tmp; prev = tmp, tmp = NEXT(tmp) ) {
2506        if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2507#ifdef SUPPORT_TAGS
2508            && (tag == tmp->tag) 
2509#endif
2510            ) {
2511            if (prev) {
2512                REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
2513                SET_NEXT(prev, NEXT(tmp));
2514            } else {
2515                REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2516                hostdata->disconnected_queue = NEXT(tmp);
2517            }
2518            SET_NEXT(tmp, NULL);
2519            break;
2520        }
2521    }
2522    
2523    if (!tmp) {
2524        printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2525#ifdef SUPPORT_TAGS
2526                "tag %d "
2527#endif
2528                "not in disconnected_queue.\n",
2529                HOSTNO, target_mask, lun
2530#ifdef SUPPORT_TAGS
2531                , tag
2532#endif
2533                );
2534        /* 
2535         * Since we have an established nexus that we can't do anything
2536         * with, we must abort it.  
2537         */
2538        do_abort(instance);
2539        return;
2540    }
2541#if 1
2542    /* engage dma setup for the command we just saw */
2543    {
2544            void *d;
2545            unsigned long count;
2546
2547            if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2548                    count = tmp->SCp.buffer->length;
2549                    d = SGADDR(tmp->SCp.buffer);
2550            } else {
2551                    count = tmp->SCp.this_residual;
2552                    d = tmp->SCp.ptr;
2553            }
2554#ifdef REAL_DMA
2555            /* setup this command for dma if not already */
2556            if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp))
2557            {
2558                    sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request));
2559                    sun3_dma_setup_done = tmp;
2560            }
2561#endif
2562    }
2563#endif
2564
2565    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2566    /* Accept message by clearing ACK */
2567    NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2568
2569#ifdef SUPPORT_TAGS
2570    /* If the phase is still MSGIN, the target wants to send some more
2571     * messages. In case it supports tagged queuing, this is probably a
2572     * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2573     */
2574    tag = TAG_NONE;
2575    if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2576        /* Accept previous IDENTIFY message by clearing ACK */
2577        NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2578        len = 2;
2579        data = msg+1;
2580        if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2581            msg[1] == SIMPLE_QUEUE_TAG)
2582            tag = msg[2];
2583        TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2584                   "reselection\n", HOSTNO, target_mask, lun, tag);
2585    }
2586#endif
2587    
2588    hostdata->connected = tmp;
2589    RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2590               HOSTNO, tmp->target, tmp->lun, tmp->tag);
2591}
2592
2593
2594/*
2595 * Function : int NCR5380_abort(struct scsi_cmnd *cmd)
2596 *
2597 * Purpose : abort a command
2598 *
2599 * Inputs : cmd - the struct scsi_cmnd to abort, code - code to set the
2600 *      host byte of the result field to, if zero DID_ABORTED is 
2601 *      used.
2602 *
2603 * Returns : 0 - success, -1 on failure.
2604 *
2605 * XXX - there is no way to abort the command that is currently 
2606 *       connected, you have to wait for it to complete.  If this is 
2607 *       a problem, we could implement longjmp() / setjmp(), setjmp()
2608 *       called where the loop started in NCR5380_main().
2609 */
2610
2611static int NCR5380_abort(struct scsi_cmnd *cmd)
2612{
2613    struct Scsi_Host *instance = cmd->device->host;
2614    SETUP_HOSTDATA(instance);
2615    struct scsi_cmnd *tmp, **prev;
2616    unsigned long flags;
2617
2618    printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2619    scsi_print_command(cmd);
2620
2621    NCR5380_print_status (instance);
2622
2623    local_irq_save(flags);
2624    
2625    ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2626                NCR5380_read(BUS_AND_STATUS_REG),
2627                NCR5380_read(STATUS_REG));
2628
2629#if 1
2630/* 
2631 * Case 1 : If the command is the currently executing command, 
2632 * we'll set the aborted flag and return control so that 
2633 * information transfer routine can exit cleanly.
2634 */
2635
2636    if (hostdata->connected == cmd) {
2637
2638        ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2639/*
2640 * We should perform BSY checking, and make sure we haven't slipped
2641 * into BUS FREE.
2642 */
2643
2644/*      NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2645/* 
2646 * Since we can't change phases until we've completed the current 
2647 * handshake, we have to source or sink a byte of data if the current
2648 * phase is not MSGOUT.
2649 */
2650
2651/* 
2652 * Return control to the executing NCR drive so we can clear the
2653 * aborted flag and get back into our main loop.
2654 */ 
2655
2656        if (do_abort(instance) == 0) {
2657          hostdata->aborted = 1;
2658          hostdata->connected = NULL;
2659          cmd->result = DID_ABORT << 16;
2660#ifdef SUPPORT_TAGS
2661          cmd_free_tag( cmd );
2662#else
2663          hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2664#endif
2665          local_irq_restore(flags);
2666          cmd->scsi_done(cmd);
2667          return SCSI_ABORT_SUCCESS;
2668        } else {
2669/*        local_irq_restore(flags); */
2670          printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2671          return SCSI_ABORT_ERROR;
2672        } 
2673   }
2674#endif
2675
2676/* 
2677 * Case 2 : If the command hasn't been issued yet, we simply remove it 
2678 *          from the issue queue.
2679 */
2680    for (prev = (struct scsi_cmnd **) &(hostdata->issue_queue),
2681        tmp = (struct scsi_cmnd *) hostdata->issue_queue;
2682        tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp))
2683        if (cmd == tmp) {
2684            REMOVE(5, *prev, tmp, NEXT(tmp));
2685            (*prev) = NEXT(tmp);
2686            SET_NEXT(tmp, NULL);
2687            tmp->result = DID_ABORT << 16;
2688            local_irq_restore(flags);
2689            ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2690                        HOSTNO);
2691            /* Tagged queuing note: no tag to free here, hasn't been assigned
2692             * yet... */
2693            tmp->scsi_done(tmp);
2694            return SCSI_ABORT_SUCCESS;
2695        }
2696
2697/* 
2698 * Case 3 : If any commands are connected, we're going to fail the abort
2699 *          and let the high level SCSI driver retry at a later time or 
2700 *          issue a reset.
2701 *
2702 *          Timeouts, and therefore aborted commands, will be highly unlikely
2703 *          and handling them cleanly in this situation would make the common
2704 *          case of noresets less efficient, and would pollute our code.  So,
2705 *          we fail.
2706 */
2707
2708    if (hostdata->connected) {
2709        local_irq_restore(flags);
2710        ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2711        return SCSI_ABORT_SNOOZE;
2712    }
2713
2714/*
2715 * Case 4: If the command is currently disconnected from the bus, and 
2716 *      there are no connected commands, we reconnect the I_T_L or 
2717 *      I_T_L_Q nexus associated with it, go into message out, and send 
2718 *      an abort message.
2719 *
2720 * This case is especially ugly. In order to reestablish the nexus, we
2721 * need to call NCR5380_select().  The easiest way to implement this 
2722 * function was to abort if the bus was busy, and let the interrupt
2723 * handler triggered on the SEL for reselect take care of lost arbitrations
2724 * where necessary, meaning interrupts need to be enabled.
2725 *
2726 * When interrupts are enabled, the queues may change - so we 
2727 * can't remove it from the disconnected queue before selecting it
2728 * because that could cause a failure in hashing the nexus if that 
2729 * device reselected.
2730 * 
2731 * Since the queues may change, we can't use the pointers from when we
2732 * first locate it.
2733 *
2734 * So, we must first locate the command, and if NCR5380_select()
2735 * succeeds, then issue the abort, relocate the command and remove
2736 * it from the disconnected queue.
2737 */
2738
2739    for (tmp = (struct scsi_cmnd *) hostdata->disconnected_queue; tmp;
2740         tmp = NEXT(tmp)) 
2741        if (cmd == tmp) {
2742            local_irq_restore(flags);
2743            ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2744  
2745            if (NCR5380_select (instance, cmd, (int) cmd->tag)) 
2746                return SCSI_ABORT_BUSY;
2747
2748            ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2749
2750            do_abort (instance);
2751
2752            local_irq_save(flags);
2753            for (prev = (struct scsi_cmnd **) &(hostdata->disconnected_queue),
2754                tmp = (struct scsi_cmnd *) hostdata->disconnected_queue;
2755                tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) )
2756                    if (cmd == tmp) {
2757                    REMOVE(5, *prev, tmp, NEXT(tmp));
2758                    *prev = NEXT(tmp);
2759                    SET_NEXT(tmp, NULL);
2760                    tmp->result = DID_ABORT << 16;
2761                    /* We must unlock the tag/LUN immediately here, since the
2762                     * target goes to BUS FREE and doesn't send us another
2763                     * message (COMMAND_COMPLETE or the like)
2764                     */
2765#ifdef SUPPORT_TAGS
2766                    cmd_free_tag( tmp );
2767#else
2768                    hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2769#endif
2770                    local_irq_restore(flags);
2771                    tmp->scsi_done(tmp);
2772                    return SCSI_ABORT_SUCCESS;
2773                }
2774        }
2775
2776/*
2777 * Case 5 : If we reached this point, the command was not found in any of 
2778 *          the queues.
2779 *
2780 * We probably reached this point because of an unlikely race condition
2781 * between the command completing successfully and the abortion code,
2782 * so we won't panic, but we will notify the user in case something really
2783 * broke.
2784 */
2785
2786    local_irq_restore(flags);
2787    printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO); 
2788
2789    return SCSI_ABORT_NOT_RUNNING;
2790}
2791
2792
2793/* 
2794 * Function : int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2795 * 
2796 * Purpose : reset the SCSI bus.
2797 *
2798 * Returns : SCSI_RESET_WAKEUP
2799 *
2800 */ 
2801
2802static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
2803{
2804    SETUP_HOSTDATA(cmd->device->host);
2805    int           i;
2806    unsigned long flags;
2807#if 1
2808    struct scsi_cmnd *connected, *disconnected_queue;
2809#endif
2810
2811
2812    NCR5380_print_status (cmd->device->host);
2813
2814    /* get in phase */
2815    NCR5380_write( TARGET_COMMAND_REG,
2816                   PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
2817    /* assert RST */
2818    NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
2819    udelay (40);
2820    /* reset NCR registers */
2821    NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
2822    NCR5380_write( MODE_REG, MR_BASE );
2823    NCR5380_write( TARGET_COMMAND_REG, 0 );
2824    NCR5380_write( SELECT_ENABLE_REG, 0 );
2825    /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2826     * through anymore ... */
2827    (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG );
2828
2829#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2830      /* XXX see below                                            XXX */
2831
2832    /* MSch: old-style reset: actually abort all command processing here */
2833
2834    /* After the reset, there are no more connected or disconnected commands
2835     * and no busy units; to avoid problems with re-inserting the commands
2836     * into the issue_queue (via scsi_done()), the aborted commands are
2837     * remembered in local variables first.
2838     */
2839    local_irq_save(flags);
2840    connected = (struct scsi_cmnd *)hostdata->connected;
2841    hostdata->connected = NULL;
2842    disconnected_queue = (struct scsi_cmnd *)hostdata->disconnected_queue;
2843    hostdata->disconnected_queue = NULL;
2844#ifdef SUPPORT_TAGS
2845    free_all_tags();
2846#endif
2847    for( i = 0; i < 8; ++i )
2848        hostdata->busy[i] = 0;
2849#ifdef REAL_DMA
2850    hostdata->dma_len = 0;
2851#endif
2852    local_irq_restore(flags);
2853
2854    /* In order to tell the mid-level code which commands were aborted, 
2855     * set the command status to DID_RESET and call scsi_done() !!!
2856     * This ultimately aborts processing of these commands in the mid-level.
2857     */
2858
2859    if ((cmd = connected)) {
2860        ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2861        cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2862        cmd->scsi_done( cmd );
2863    }
2864
2865    for (i = 0; (cmd = disconnected_queue); ++i) {
2866        disconnected_queue = NEXT(cmd);
2867        SET_NEXT(cmd, NULL);
2868        cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2869        cmd->scsi_done( cmd );
2870    }
2871    if (i > 0)
2872        ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
2873
2874
2875    /* since all commands have been explicitly terminated, we need to tell
2876     * the midlevel code that the reset was SUCCESSFUL, and there is no 
2877     * need to 'wake up' the commands by a request_sense
2878     */
2879    return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
2880#else /* 1 */
2881
2882    /* MSch: new-style reset handling: let the mid-level do what it can */
2883
2884    /* ++guenther: MID-LEVEL IS STILL BROKEN.
2885     * Mid-level is supposed to requeue all commands that were active on the
2886     * various low-level queues. In fact it does this, but that's not enough
2887     * because all these commands are subject to timeout. And if a timeout
2888     * happens for any removed command, *_abort() is called but all queues
2889     * are now empty. Abort then gives up the falcon lock, which is fatal,
2890     * since the mid-level will queue more commands and must have the lock
2891     * (it's all happening inside timer interrupt handler!!).
2892     * Even worse, abort will return NOT_RUNNING for all those commands not
2893     * on any queue, so they won't be retried ...
2894     *
2895     * Conclusion: either scsi.c disables timeout for all resetted commands
2896     * immediately, or we lose!  As of linux-2.0.20 it doesn't.
2897     */
2898
2899    /* After the reset, there are no more connected or disconnected commands
2900     * and no busy units; so clear the low-level status here to avoid 
2901     * conflicts when the mid-level code tries to wake up the affected 
2902     * commands!
2903     */
2904
2905    if (hostdata->issue_queue)
2906        ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2907    if (hostdata->connected) 
2908        ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2909    if (hostdata->disconnected_queue)
2910        ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
2911
2912    local_irq_save(flags);
2913    hostdata->issue_queue = NULL;
2914    hostdata->connected = NULL;
2915    hostdata->disconnected_queue = NULL;
2916#ifdef SUPPORT_TAGS
2917    free_all_tags();
2918#endif
2919    for( i = 0; i < 8; ++i )
2920        hostdata->busy[i] = 0;
2921#ifdef REAL_DMA
2922    hostdata->dma_len = 0;
2923#endif
2924    local_irq_restore(flags);
2925
2926    /* we did no complete reset of all commands, so a wakeup is required */
2927    return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
2928#endif /* 1 */
2929}
2930
2931/* Local Variables: */
2932/* tab-width: 8     */
2933/* End:             */
2934
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.