root/drivers/scsi/seagate.c

/* [previous][next][first][last][top][bottom][index][help] */

DEFINITIONS

This source file includes following definitions.
  1. st0x_setup
  2. tmc8xx_setup
  3. borken_init
  4. borken_wait
  5. seagate_st0x_detect
  6. seagate_st0x_info
  7. seagate_reconnect_intr
  8. seagate_st0x_queue_command
  9. seagate_st0x_command
  10. internal_command
  11. seagate_st0x_abort
  12. seagate_st0x_reset
  13. seagate_st0x_biosparam

   1 /*
   2  *      seagate.c Copyright (C) 1992, 1993 Drew Eckhardt 
   3  *      low level scsi driver for ST01/ST02, Future Domain TMC-885, 
   4  *      TMC-950  by
   5  *
   6  *              Drew Eckhardt 
   7  *
   8  *      <drew@colorado.edu>
   9  *
  10  *      Note : TMC-880 boards don't work because they have two bits in 
  11  *              the status register flipped, I'll fix this "RSN"
  12  *
  13  *      This card does all the I/O via memory mapped I/O, so there is no need
  14  *      to check or snarf a region of the I/O address space.
  15  */
  16 
  17 /*
  18  * Configuration : 
  19  * To use without BIOS -DOVERRIDE=base_address -DCONTROLLER=FD or SEAGATE
  20  * -DIRQ will override the default of 5.
  21  * Note: You can now set these options from the kernel's "command line".
  22  * The syntax is:
  23  *
  24  *     st0x=ADDRESS,IRQ                (for a Seagate controller)
  25  * or:
  26  *     tmc8xx=ADDRESS,IRQ              (for a TMC-8xx or TMC-950 controller)
  27  * eg:
  28  *     tmc8xx=0xC8000,15
  29  *
  30  * will configure the driver for a TMC-8xx style controller using IRQ 15
  31  * with a base address of 0xC8000.
  32  * 
  33  * -DFAST or -DFAST32 will use blind transfers where possible
  34  *
  35  * -DARBITRATE will cause the host adapter to arbitrate for the 
  36  *      bus for better SCSI-II compatibility, rather than just 
  37  *      waiting for BUS FREE and then doing its thing.  Should
  38  *      let us do one command per Lun when I integrate my 
  39  *      reorganization changes into the distribution sources.
  40  *
  41  * -DSLOW_HANDSHAKE will allow compatibility with broken devices that don't 
  42  *      handshake fast enough (ie, some CD ROM's) for the Seagate
  43  *      code.
  44  *
  45  * -DSLOW_RATE=x, x some number will let you specify a default 
  46  *      transfer rate if handshaking isn't working correctly.
  47  */
  48 
  49 
  50 #include <asm/io.h>
  51 #include <asm/system.h>
  52 #include <linux/signal.h>
  53 #include <linux/sched.h>
  54 #include <linux/string.h>
  55 #include <linux/config.h>
  56 
  57 #include "../block/blk.h"
  58 #include "scsi.h"
  59 #include "hosts.h"
  60 #include "seagate.h"
  61 #include "constants.h"
  62 
  63 
  64 #ifndef IRQ
  65 #define IRQ 5
  66 #endif
  67 
  68 #if (defined(FAST32) && !defined(FAST))
  69 #define FAST
  70 #endif
  71 
  72 #if defined(SLOW_RATE) && !defined(SLOW_HANDSHAKE)
  73 #define SLOW_HANDSHAKE
  74 #endif
  75 
  76 #if defined(SLOW_HANDSHAKE) && !defined(SLOW_RATE)
  77 #define SLOW_RATE 50
  78 #endif
  79 
  80 
  81 #if defined(LINKED)
  82 #undef LINKED           /* Linked commands are currently broken ! */
  83 #endif
  84 
  85 static int internal_command(unsigned char target, unsigned char lun,
  86                             const void *cmnd,
  87                          void *buff, int bufflen, int reselect);
  88 
  89 static int incommand;                   /*
  90                                                 set if arbitration has finished and we are 
  91                                                 in some command phase.
  92                                         */
  93 
  94 static void *base_address = NULL;       /*
  95                                                 Where the card ROM starts,
  96                                                 used to calculate memory mapped
  97                                                 register location.
  98                                         */
  99 #ifdef notyet
 100 static volatile int abort_confirm = 0;
 101 #endif
 102 
 103 static volatile void *st0x_cr_sr;       /*
 104                                                 control register write,
 105                                                 status register read.
 106                                                 256 bytes in length.
 107 
 108                                                 Read is status of SCSI BUS,
 109                                                 as per STAT masks.
 110 
 111                                         */
 112 
 113 
 114 static volatile void *st0x_dr;         /*
 115                                                 data register, read write
 116                                                 256 bytes in length.
 117                                         */
 118 
 119 
 120 static volatile int st0x_aborted=0;     /* 
 121                                                 set when we are aborted, ie by a time out, etc.
 122                                         */
 123 
 124 static unsigned char controller_type = 0; /* set to SEAGATE for ST0x boards or FD for TMC-8xx boards */
 125 static unsigned char irq = IRQ;
 126                         
 127 #define retcode(result) (((result) << 16) | (message << 8) | status)                    
 128 #define STATUS (*(volatile unsigned char *) st0x_cr_sr)
 129 #define CONTROL STATUS 
 130 #define DATA (*(volatile unsigned char *) st0x_dr)
 131 
 132 void st0x_setup (char *str, int *ints) {
     /* [previous][next][first][last][top][bottom][index][help] */
 133     controller_type = SEAGATE;
 134     base_address = (void *) ints[1];
 135     irq = ints[2];
 136 }
 137 
 138 void tmc8xx_setup (char *str, int *ints) {
     /* [previous][next][first][last][top][bottom][index][help] */
 139     controller_type = FD;
 140     base_address = (void *) ints[1];
 141     irq = ints[2];
 142 }
 143     
 144 
 145 #ifndef OVERRIDE                
 146 static const char *  seagate_bases[] = {
 147         (char *) 0xc8000, (char *) 0xca000, (char *) 0xcc000,
 148         (char *) 0xce000, (char *) 0xdc000, (char *) 0xde000
 149 };
 150 
 151 typedef struct {
 152         char *signature ;
 153         unsigned offset;
 154         unsigned length;
 155         unsigned char type;
 156 } Signature;
 157         
 158 static const Signature signatures[] = {
 159 #ifdef CONFIG_SCSI_SEAGATE
 160 {"ST01 v1.7  (C) Copyright 1987 Seagate", 15, 37, SEAGATE},
 161 {"SCSI BIOS 2.00  (C) Copyright 1987 Seagate", 15, 40, SEAGATE},
 162 
 163 /*
 164  * The following two lines are NOT mistakes.  One detects ROM revision 
 165  * 3.0.0, the other 3.2.  Since seagate has only one type of SCSI adapter, 
 166  * and this is not going to change, the "SEAGATE" and "SCSI" together
 167  * are probably "good enough"
 168  */
 169 
 170 {"SEAGATE SCSI BIOS ",16, 17, SEAGATE},
 171 {"SEAGATE SCSI BIOS ",17, 17, SEAGATE},
 172 
 173 /*
 174  * However, future domain makes several incompatible SCSI boards, so specific
 175  * signatures must be used.
 176  */
 177 
 178 {"FUTURE DOMAIN CORP. (C) 1986-1989 V5.0C2/14/89", 5, 46, FD},
 179 {"FUTURE DOMAIN CORP. (C) 1986-1989 V6.0A7/28/89", 5, 46, FD},
 180 {"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0105/31/90",5, 47, FD},
 181 {"FUTURE DOMAIN CORP. (C) 1986-1990 V6.0209/18/90",5, 47, FD},
 182 {"FUTURE DOMAIN CORP. (C) 1986-1990 V7.009/18/90", 5, 46, FD},
 183 {"FUTURE DOMAIN CORP. (C) 1992 V8.00.004/02/92",   5, 44, FD},
 184 {"FUTURE DOMAIN TMC-950",                        5, 21, FD},
 185 #endif /* CONFIG_SCSI_SEAGATE */
 186 }
 187 ;
 188 
 189 #define NUM_SIGNATURES (sizeof(signatures) / sizeof(Signature))
 190 #endif /* n OVERRIDE */
 191 
 192 /*
 193  * hostno stores the hostnumber, as told to us by the init routine.
 194  */
 195 
 196 static int hostno = -1;
 197 static void seagate_reconnect_intr(int, struct pt_regs *);
 198 
 199 #ifdef FAST
 200 static int fast = 1;
 201 #endif 
 202 
 203 #ifdef SLOW_HANDSHAKE
 204 /* 
 205  * Support for broken devices : 
 206  * The Seagate board has a handshaking problem.  Namely, a lack 
 207  * thereof for slow devices.  You can blast 600K/second through 
 208  * it if you are polling for each byte, more if you do a blind 
 209  * transfer.  In the first case, with a fast device, REQ will 
 210  * transition high-low or high-low-high before your loop restarts 
 211  * and you'll have no problems.  In the second case, the board 
 212  * will insert wait states for up to 13.2 usecs for REQ to 
 213  * transition low->high, and everything will work.
 214  *
 215  * However, there's nothing in the state machine that says 
 216  * you *HAVE* to see a high-low-high set of transitions before
 217  * sending the next byte, and slow things like the Trantor CD ROMS
 218  * will break because of this.
 219  * 
 220  * So, we need to slow things down, which isn't as simple as it 
 221  * seems.  We can't slow things down period, because then people
 222  * who don't recompile their kernels will shoot me for ruining 
 223  * their performance.  We need to do it on a case per case basis.
 224  *
 225  * The best for performance will be to, only for borken devices 
 226  * (this is stored on a per-target basis in the scsi_devices array)
 227  * 
 228  * Wait for a low->high transition before continuing with that 
 229  * transfer.  If we timeout, continue anyways.  We don't need 
 230  * a long timeout, because REQ should only be asserted until the 
 231  * corresponding ACK is received and processed.
 232  *
 233  * Note that we can't use the system timer for this, because of 
 234  * resolution, and we *really* can't use the timer chip since 
 235  * gettimeofday() and the beeper routines use that.  So,
 236  * the best thing for us to do will be to calibrate a timing
 237  * loop in the initialization code using the timer chip before
 238  * gettimeofday() can screw with it.
 239  */
 240 
 241 static int borken_calibration = 0;
 242 static void borken_init (void) {
     /* [previous][next][first][last][top][bottom][index][help] */
 243   register int count = 0, start = jiffies + 1, stop = start + 25;
 244 
 245   while (jiffies < start);
 246   for (;jiffies < stop; ++count);
 247 
 248 /* 
 249  * Ok, we now have a count for .25 seconds.  Convert to a 
 250  * count per second and divide by transfer rate in K.
 251  */
 252 
 253   borken_calibration =  (count * 4) / (SLOW_RATE*1024);
 254 
 255   if (borken_calibration < 1)
 256         borken_calibration = 1;
 257 #if (DEBUG & DEBUG_BORKEN)
 258   printk("scsi%d : borken calibrated to %dK/sec, %d cycles per transfer\n", 
 259         hostno, BORKEN_RATE, borken_calibration);
 260 #endif
 261 }
 262 
 263 static inline void borken_wait(void) {
     /* [previous][next][first][last][top][bottom][index][help] */
 264   register int count;
 265   for (count = borken_calibration; count && (STATUS & STAT_REQ); 
 266         --count);
 267 #if (DEBUG & DEBUG_BORKEN) 
 268   if (count)
 269         printk("scsi%d : borken timeout\n", hostno);
 270 #endif 
 271 }
 272 
 273 #endif /* def SLOW_HANDSHAKE */
 274 
 275 int seagate_st0x_detect (Scsi_Host_Template * tpnt)
     /* [previous][next][first][last][top][bottom][index][help] */
 276         {
 277      struct Scsi_Host *instance;
 278 #ifndef OVERRIDE
 279         int i,j;
 280 #endif 
 281 
 282 /*
 283  *      First, we try for the manual override.
 284  */
 285 #ifdef DEBUG 
 286         printk("Autodetecting ST0x / TMC-8xx\n");
 287 #endif
 288         
 289         if (hostno != -1)
 290                 {
 291                 printk ("ERROR : seagate_st0x_detect() called twice.\n");
 292                 return 0;
 293                 }
 294 
 295       /* If the user specified the controller type from the command line,
 296          controller_type will be non-zero, so don't try and detect one */
 297 
 298         if (!controller_type) {
 299 #ifdef OVERRIDE
 300         base_address = (void *) OVERRIDE;
 301 
 302 /* CONTROLLER is used to override controller (SEAGATE or FD). PM: 07/01/93 */
 303 #ifdef CONTROLLER
 304         controller_type = CONTROLLER;
 305 #else
 306 #error Please use -DCONTROLLER=SEAGATE or -DCONTROLLER=FD to override controller type
 307 #endif /* CONTROLLER */
 308 #ifdef DEBUG
 309         printk("Base address overridden to %x, controller type is %s\n",
 310                 base_address,controller_type == SEAGATE ? "SEAGATE" : "FD");
 311 #endif 
 312 #else /* OVERRIDE */    
 313 /*
 314  *      To detect this card, we simply look for the signature
 315  *      from the BIOS version notice in all the possible locations
 316  *      of the ROM's.  This has a nice side effect of not trashing
 317  *      any register locations that might be used by something else.
 318  *
 319  * XXX - note that we probably should be probing the address
 320  * space for the on-board RAM instead.
 321  */
 322 
 323         for (i = 0; i < (sizeof (seagate_bases) / sizeof (char  * )); ++i)
 324                 for (j = 0; !base_address && j < NUM_SIGNATURES; ++j)
 325                 if (!memcmp ((void *) (seagate_bases[i] +
 326                     signatures[j].offset), (void *) signatures[j].signature,
 327                     signatures[j].length)) {
 328                         base_address = (void *) seagate_bases[i];
 329                         controller_type = signatures[j].type;
 330                 }
 331 #endif /* OVERRIDE */
 332         } /* (! controller_type) */
 333  
 334         tpnt->this_id = (controller_type == SEAGATE) ? 7 : 6;
 335         tpnt->name = (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR;
 336 
 337         if (base_address)
 338                 {
 339                 st0x_cr_sr =(void *) (((unsigned char *) base_address) + (controller_type == SEAGATE ? 0x1a00 : 0x1c00)); 
 340                 st0x_dr = (void *) (((unsigned char *) base_address ) + (controller_type == SEAGATE ? 0x1c00 : 0x1e00));
 341 #ifdef DEBUG
 342                 printk("%s detected. Base address = %x, cr = %x, dr = %x\n", tpnt->name, base_address, st0x_cr_sr, st0x_dr);
 343 #endif
 344 /*
 345  *      At all times, we will use IRQ 5.  Should also check for IRQ3 if we 
 346  *      loose our first interrupt.
 347  */
 348                 instance = scsi_register(tpnt, 0);
 349                 hostno = instance->host_no;
 350                 if (request_irq((int) irq, seagate_reconnect_intr, SA_INTERRUPT,
 351                    (controller_type == SEAGATE) ? "seagate" : "tmc-8xx")) {
 352                         printk("scsi%d : unable to allocate IRQ%d\n",
 353                                 hostno, (int) irq);
 354                         return 0;
 355                 }
 356 #ifdef SLOW_HANDSHAKE
 357                 borken_init();
 358 #endif
 359                 
 360                 printk("%s options:"
 361 #ifdef ARBITRATE
 362                 " ARBITRATE"
 363 #endif
 364 #ifdef SLOW_HANDSHAKE
 365                 " SLOW_HANDSHAKE"
 366 #endif
 367 #ifdef FAST
 368 #ifdef FAST32
 369                 " FAST32"
 370 #else
 371                 " FAST"
 372 #endif
 373 #endif
 374 #ifdef LINKED
 375                 " LINKED"
 376 #endif
 377               "\n", tpnt->name);
 378                 return 1;
 379                 }
 380         else
 381                 {
 382 #ifdef DEBUG
 383                 printk("ST0x / TMC-8xx not detected.\n");
 384 #endif
 385                 return 0;
 386                 }
 387         }
 388          
 389 const char *seagate_st0x_info(struct Scsi_Host * shpnt) {
     /* [previous][next][first][last][top][bottom][index][help] */
 390       static char buffer[64];
 391         sprintf(buffer, "%s at irq %d, address 0x%05X", 
 392                 (controller_type == SEAGATE) ? ST0X_ID_STR : FD_ID_STR,
 393                 irq, (unsigned int)base_address);
 394         return buffer;
 395 }
 396 
 397 /*
 398  * These are our saved pointers for the outstanding command that is 
 399  * waiting for a reconnect
 400  */
 401 
 402 static unsigned char current_target, current_lun;
 403 static unsigned char *current_cmnd, *current_data;
 404 static int current_nobuffs;
 405 static struct scatterlist *current_buffer;
 406 static int current_bufflen;
 407 
 408 #ifdef LINKED
 409 
 410 /* 
 411  * linked_connected indicates weather or not we are currently connected to 
 412  * linked_target, linked_lun and in an INFORMATION TRANSFER phase,
 413  * using linked commands.
 414  */
 415 
 416 static int linked_connected = 0;
 417 static unsigned char linked_target, linked_lun;
 418 #endif
 419 
 420 
 421 static void (*done_fn)(Scsi_Cmnd *) = NULL;
 422 static Scsi_Cmnd * SCint = NULL;
 423 
 424 /*
 425  * These control whether or not disconnect / reconnect will be attempted,
 426  * or are being attempted.
 427  */
 428 
 429 #define NO_RECONNECT    0
 430 #define RECONNECT_NOW   1
 431 #define CAN_RECONNECT   2
 432 
 433 #ifdef LINKED
 434 
 435 /*
 436  * LINKED_RIGHT indicates that we are currently connected to the correct target
 437  * for this command, LINKED_WRONG indicates that we are connected to the wrong 
 438  * target.  Note that these imply CAN_RECONNECT.
 439  */
 440 
 441 #define LINKED_RIGHT    3
 442 #define LINKED_WRONG    4
 443 #endif
 444 
 445 /*
 446  * This determines if we are expecting to reconnect or not.
 447  */
 448 
 449 static int should_reconnect = 0;
 450 
 451 /*
 452  * The seagate_reconnect_intr routine is called when a target reselects the 
 453  * host adapter.  This occurs on the interrupt triggered by the target 
 454  * asserting SEL.
 455  */
 456 
 457 static void seagate_reconnect_intr(int irq, struct pt_regs * regs)
     /* [previous][next][first][last][top][bottom][index][help] */
 458         {
 459         int temp;
 460         Scsi_Cmnd * SCtmp;
 461 
 462 /* enable all other interrupts. */      
 463         sti();
 464 #if (DEBUG & PHASE_RESELECT)
 465         printk("scsi%d : seagate_reconnect_intr() called\n", hostno);
 466 #endif
 467 
 468         if (!should_reconnect)
 469             printk("scsi%d: unexpected interrupt.\n", hostno);
 470         else {
 471                  should_reconnect = 0;
 472 
 473 #if (DEBUG & PHASE_RESELECT)
 474                 printk("scsi%d : internal_command("
 475                        "%d, %08x, %08x, %d, RECONNECT_NOW\n", hostno, 
 476                         current_target, current_data, current_bufflen);
 477 #endif
 478         
 479                 temp =  internal_command (current_target, current_lun,
 480                         current_cmnd, current_data, current_bufflen,
 481                         RECONNECT_NOW);
 482 
 483                 if (msg_byte(temp) != DISCONNECT) {
 484                         if (done_fn) {
 485 #if (DEBUG & PHASE_RESELECT)
 486                                 printk("scsi%d : done_fn(%d,%08x)", hostno, 
 487                                 hostno, temp);
 488 #endif
 489                                 if(!SCint) panic("SCint == NULL in seagate");
 490                                 SCtmp = SCint;
 491                                 SCint = NULL;
 492                                 SCtmp->result = temp;
 493                                 done_fn (SCtmp);
 494                         } else
 495                                 printk("done_fn() not defined.\n");
 496                         }
 497                 }
 498         } 
 499 
 500 /* 
 501  * The seagate_st0x_queue_command() function provides a queued interface
 502  * to the seagate SCSI driver.  Basically, it just passes control onto the
 503  * seagate_command() function, after fixing it so that the done_fn()
 504  * is set to the one passed to the function.  We have to be very careful,
 505  * because there are some commands on some devices that do not disconnect,
 506  * and if we simply call the done_fn when the command is done then another
 507  * command is started and queue_command is called again...  We end up
 508  * overflowing the kernel stack, and this tends not to be such a good idea.
 509  */
 510 
 511 static int recursion_depth = 0;
 512 
 513 int seagate_st0x_queue_command (Scsi_Cmnd * SCpnt,  void (*done)(Scsi_Cmnd *))
     /* [previous][next][first][last][top][bottom][index][help] */
 514         {
 515         int result, reconnect;
 516         Scsi_Cmnd * SCtmp;
 517 
 518         done_fn = done;
 519         current_target = SCpnt->target;
 520         current_lun = SCpnt->lun;
 521         (const void *) current_cmnd = SCpnt->cmnd;
 522         current_data = (unsigned char *) SCpnt->request_buffer;
 523         current_bufflen = SCpnt->request_bufflen;
 524         SCint = SCpnt;
 525         if(recursion_depth) {
 526           return 0;
 527         };
 528         recursion_depth++;
 529         do{
 530 #ifdef LINKED
 531 /*
 532  * Set linked command bit in control field of SCSI command.
 533  */
 534 
 535           current_cmnd[SCpnt->cmd_len] |= 0x01;
 536           if (linked_connected) {
 537 #if (DEBUG & DEBUG_LINKED) 
 538             printk("scsi%d : using linked commands, current I_T_L nexus is ",
 539               hostno);
 540 #endif
 541             if ((linked_target == current_target) && 
 542               (linked_lun == current_lun)) {
 543 #if (DEBUG & DEBUG_LINKED) 
 544             printk("correct\n");
 545 #endif
 546               reconnect = LINKED_RIGHT;
 547             } else {
 548 #if (DEBUG & DEBUG_LINKED) 
 549             printk("incorrect\n");
 550 #endif
 551               reconnect = LINKED_WRONG;
 552             }
 553           } else 
 554 #endif /* LINKED */
 555             reconnect = CAN_RECONNECT;
 556 
 557 
 558 
 559 
 560 
 561           result = internal_command (SCint->target, SCint->lun, SCint->cmnd, SCint->request_buffer,
 562                                      SCint->request_bufflen, 
 563                                      reconnect);
 564           if (msg_byte(result) == DISCONNECT)  break;
 565           SCtmp = SCint;
 566           SCint = NULL;
 567           SCtmp->result = result;
 568           done_fn (SCtmp);
 569         } while(SCint);
 570         recursion_depth--;
 571         return 0;
 572       }
 573 
 574 int seagate_st0x_command (Scsi_Cmnd * SCpnt) {
     /* [previous][next][first][last][top][bottom][index][help] */
 575         return internal_command (SCpnt->target, SCpnt->lun, SCpnt->cmnd, SCpnt->request_buffer,
 576                                  SCpnt->request_bufflen, 
 577                                  (int) NO_RECONNECT);
 578 }
 579         
 580 static int internal_command(unsigned char target, unsigned char lun, const void *cmnd,
     /* [previous][next][first][last][top][bottom][index][help] */
 581                          void *buff, int bufflen, int reselect) {
 582         int len = 0;
 583         unsigned char *data = NULL;     
 584         struct scatterlist *buffer = NULL;
 585         int nobuffs = 0;
 586         int clock;                      
 587         int temp;
 588 #ifdef SLOW_HANDSHAKE
 589         int borken;     /* Does the current target require Very Slow I/O ? */
 590 #endif
 591 
 592 
 593 #if (DEBUG & PHASE_DATAIN) || (DEBUG & PHASE_DATOUT) 
 594         int transfered = 0;
 595 #endif
 596 
 597 #if (((DEBUG & PHASE_ETC) == PHASE_ETC) || (DEBUG & PRINT_COMMAND) || \
 598         (DEBUG & PHASE_EXIT))   
 599         int i;
 600 #endif
 601 
 602 #if ((DEBUG & PHASE_ETC) == PHASE_ETC)
 603         int phase=0, newphase;
 604 #endif
 605 
 606         int done = 0;
 607         unsigned char status = 0;       
 608         unsigned char message = 0;
 609         register unsigned char status_read;
 610 
 611         unsigned transfersize = 0, underflow = 0;
 612 
 613         incommand = 0;
 614         st0x_aborted = 0;
 615 
 616 #ifdef SLOW_HANDSHAKE
 617         borken = (int) SCint->device->borken;
 618 #endif
 619 
 620 #if (DEBUG & PRINT_COMMAND)
 621         printk ("scsi%d : target = %d, command = ", hostno, target);
 622         print_command((unsigned char *) cmnd);
 623         printk("\n");
 624 #endif
 625 
 626 #if (DEBUG & PHASE_RESELECT)
 627         switch (reselect) {
 628         case RECONNECT_NOW :
 629                 printk("scsi%d : reconnecting\n", hostno);
 630                 break;
 631 #ifdef LINKED
 632         case LINKED_RIGHT : 
 633                 printk("scsi%d : connected, can reconnect\n", hostno);
 634                 break;
 635         case LINKED_WRONG :
 636                 printk("scsi%d : connected to wrong target, can reconnect\n",
 637                         hostno);
 638                 break;          
 639 #endif
 640         case CAN_RECONNECT :
 641                 printk("scsi%d : allowed to reconnect\n", hostno);
 642                 break;
 643         default :
 644                 printk("scsi%d : not allowed to reconnect\n", hostno);
 645         }
 646 #endif
 647         
 648 
 649         if (target == (controller_type == SEAGATE ? 7 : 6))
 650                 return DID_BAD_TARGET;
 651 
 652 /*
 653  *      We work it differently depending on if this is is "the first time,"
 654  *      or a reconnect.  If this is a reselect phase, then SEL will 
 655  *      be asserted, and we must skip selection / arbitration phases.
 656  */
 657 
 658         switch (reselect) {
 659         case RECONNECT_NOW:
 660 #if (DEBUG & PHASE_RESELECT)
 661                 printk("scsi%d : phase RESELECT \n", hostno);
 662 #endif
 663 
 664 /*
 665  *      At this point, we should find the logical or of our ID and the original
 666  *      target's ID on the BUS, with BSY, SEL, and I/O signals asserted.
 667  *
 668  *      After ARBITRATION phase is completed, only SEL, BSY, and the 
 669  *      target ID are asserted.  A valid initiator ID is not on the bus
 670  *      until IO is asserted, so we must wait for that.
 671  */
 672                 clock = jiffies + 10;
 673                 for (;;) {
 674                         temp = STATUS;
 675                         if ((temp & STAT_IO) && !(temp & STAT_BSY))
 676                                 break;
 677 
 678                         if (jiffies > clock) {
 679 #if (DEBUG & PHASE_RESELECT)
 680                                 printk("scsi%d : RESELECT timed out while waiting for IO .\n",
 681                                         hostno);
 682 #endif
 683                                 return (DID_BAD_INTR << 16);
 684                         }
 685                 }
 686 
 687 /* 
 688  *      After I/O is asserted by the target, we can read our ID and its
 689  *      ID off of the BUS.
 690  */
 691  
 692                 if (!((temp = DATA) & (controller_type == SEAGATE ? 0x80 : 0x40)))
 693                         {
 694 #if (DEBUG & PHASE_RESELECT)
 695                         printk("scsi%d : detected reconnect request to different target.\n" 
 696                                "\tData bus = %d\n", hostno, temp);
 697 #endif
 698                         return (DID_BAD_INTR << 16);
 699                         }
 700 
 701                 if (!(temp & (1 << current_target)))
 702                         {
 703                         printk("scsi%d : Unexpected reselect interrupt.  Data bus = %d\n",
 704                                 hostno, temp);
 705                         return (DID_BAD_INTR << 16);
 706                         }
 707 
 708                 buffer=current_buffer;  
 709                 cmnd=current_cmnd;      /* WDE add */
 710                 data=current_data;      /* WDE add */
 711                 len=current_bufflen;    /* WDE add */
 712                 nobuffs=current_nobuffs;
 713 
 714 /*
 715  *      We have determined that we have been selected.  At this point, 
 716  *      we must respond to the reselection by asserting BSY ourselves
 717  */
 718 
 719 #if 1
 720                 CONTROL = (BASE_CMD | CMD_DRVR_ENABLE | CMD_BSY);
 721 #else
 722                 CONTROL = (BASE_CMD | CMD_BSY);
 723 #endif
 724 
 725 /*
 726  *      The target will drop SEL, and raise BSY, at which time we must drop
 727  *      BSY.
 728  */
 729 
 730                 for (clock = jiffies + 10; (jiffies < clock) &&  (STATUS & STAT_SEL););
 731 
 732                 if (jiffies >= clock)
 733                         { 
 734                         CONTROL = (BASE_CMD | CMD_INTR);
 735 #if (DEBUG & PHASE_RESELECT)
 736                         printk("scsi%d : RESELECT timed out while waiting for SEL.\n",
 737                                 hostno);
 738 #endif
 739                         return (DID_BAD_INTR << 16);                             
 740                         }
 741 
 742                 CONTROL = BASE_CMD;
 743 
 744 /*
 745  *      At this point, we have connected with the target and can get 
 746  *      on with our lives.
 747  */      
 748                 break;
 749         case CAN_RECONNECT:
 750 
 751 #ifdef LINKED
 752 /*
 753  * This is a bletcherous hack, just as bad as the Unix #! interpreter stuff.
 754  * If it turns out we are using the wrong I_T_L nexus, the easiest way to deal
 755  * with it is to go into our INFORMATION TRANSFER PHASE code, send a ABORT 
 756  * message on MESSAGE OUT phase, and then loop back to here.
 757  */
 758   
 759 connect_loop :
 760 
 761 #endif
 762 
 763 #if (DEBUG & PHASE_BUS_FREE)
 764                 printk ("scsi%d : phase = BUS FREE \n", hostno);
 765 #endif
 766 
 767 /*
 768  *      BUS FREE PHASE
 769  *
 770  *      On entry, we make sure that the BUS is in a BUS FREE
 771  *      phase, by insuring that both BSY and SEL are low for
 772  *      at least one bus settle delay.  Several reads help
 773  *      eliminate wire glitch.
 774  */
 775 
 776                 clock = jiffies + ST0X_BUS_FREE_DELAY;  
 777 
 778 #if !defined (ARBITRATE) 
 779                 while (((STATUS |  STATUS | STATUS) & 
 780                          (STAT_BSY | STAT_SEL)) && 
 781                          (!st0x_aborted) && (jiffies < clock));
 782 
 783                 if (jiffies > clock)
 784                         return retcode(DID_BUS_BUSY);
 785                 else if (st0x_aborted)
 786                         return retcode(st0x_aborted);
 787 #endif
 788 
 789 #if (DEBUG & PHASE_SELECTION)
 790                 printk("scsi%d : phase = SELECTION\n", hostno);
 791 #endif
 792 
 793                 clock = jiffies + ST0X_SELECTION_DELAY;
 794 
 795 /*
 796  * Arbitration/selection procedure : 
 797  * 1.  Disable drivers
 798  * 2.  Write HOST adapter address bit
 799  * 3.  Set start arbitration.
 800  * 4.  We get either ARBITRATION COMPLETE or SELECT at this
 801  *     point.
 802  * 5.  OR our ID and targets on bus.
 803  * 6.  Enable SCSI drivers and asserted SEL and ATTN
 804  */
 805                 
 806 #if defined(ARBITRATE)  
 807         cli();
 808         CONTROL = 0;
 809         DATA = (controller_type == SEAGATE) ? 0x80 : 0x40;
 810         CONTROL = CMD_START_ARB; 
 811         sti();
 812         while (!((status_read = STATUS) & (STAT_ARB_CMPL | STAT_SEL)) &&
 813                 (jiffies < clock) && !st0x_aborted);
 814 
 815         if (!(status_read & STAT_ARB_CMPL)) {
 816 #if (DEBUG & PHASE_SELECTION)
 817                 if (status_read & STAT_SEL) 
 818                         printk("scsi%d : arbitration lost\n", hostno);
 819                 else
 820                         printk("scsi%d : arbitration timeout.\n", hostno);
 821 #endif
 822                 CONTROL = BASE_CMD;
 823                 return retcode(DID_NO_CONNECT);
 824         };
 825 
 826 #if (DEBUG & PHASE_SELECTION)
 827         printk("scsi%d : arbitration complete\n", hostno);
 828 #endif
 829 #endif
 830 
 831 
 832 /*
 833  *      When the SCSI device decides that we're gawking at it, it will 
 834  *      respond by asserting BUSY on the bus.
 835  *
 836  *      Note : the Seagate ST-01/02 product manual says that we should 
 837  *      twiddle the DATA register before the control register.  However,
 838  *      this does not work reliably so we do it the other way around.
 839  *
 840  *      Probably could be a problem with arbitration too, we really should
 841  *      try this with a SCSI protocol or logic analyzer to see what is 
 842  *      going on.
 843  */
 844         cli();
 845         DATA = (unsigned char) ((1 << target) | (controller_type == SEAGATE ? 0x80 : 0x40));
 846         CONTROL = BASE_CMD | CMD_DRVR_ENABLE | CMD_SEL | 
 847                 (reselect ? CMD_ATTN : 0);
 848         sti();
 849                 while (!((status_read = STATUS) & STAT_BSY) && 
 850                         (jiffies < clock) && !st0x_aborted)
 851 
 852 #if 0 && (DEBUG & PHASE_SELECTION)
 853                 {
 854                 temp = clock - jiffies;
 855 
 856                 if (!(jiffies % 5))
 857                         printk("seagate_st0x_timeout : %d            \r",temp);
 858         
 859                 }
 860                 printk("Done.                                             \n");
 861                 printk("scsi%d : status = %02x, seagate_st0x_timeout = %d, aborted = %02x \n", 
 862                         hostno, status_read, temp, st0x_aborted);
 863 #else
 864                 ;
 865 #endif
 866         
 867 
 868                 if ((jiffies >= clock)  && !(status_read & STAT_BSY))
 869                         {
 870 #if (DEBUG & PHASE_SELECTION)
 871                         printk ("scsi%d : NO CONNECT with target %d, status = %x \n", 
 872                                 hostno, target, STATUS);
 873 #endif
 874                         return retcode(DID_NO_CONNECT);
 875                         }
 876 
 877 /*
 878  *      If we have been aborted, and we have a command in progress, IE the 
 879  *      target still has BSY asserted, then we will reset the bus, and 
 880  *      notify the midlevel driver to expect sense.
 881  */
 882 
 883                 if (st0x_aborted) {
 884                         CONTROL = BASE_CMD;
 885                         if (STATUS & STAT_BSY) {
 886                                 printk("scsi%d : BST asserted after we've been aborted.\n",
 887                                         hostno);
 888                                 seagate_st0x_reset(NULL);
 889                                 return retcode(DID_RESET);
 890                         }
 891                         return retcode(st0x_aborted);
 892                 }       
 893 
 894 /* Establish current pointers.  Take into account scatter / gather */
 895 
 896         if ((nobuffs = SCint->use_sg)) {
 897 #if (DEBUG & DEBUG_SG)
 898         {
 899         int i;
 900         printk("scsi%d : scatter gather requested, using %d buffers.\n",
 901                 hostno, nobuffs);
 902         for (i = 0; i < nobuffs; ++i)
 903                 printk("scsi%d : buffer %d address = %08x length = %d\n",
 904                         hostno, i, buffer[i].address, buffer[i].length);
 905         }
 906 #endif
 907                 
 908                 buffer = (struct scatterlist *) SCint->buffer;
 909                 len = buffer->length;
 910                 data = (unsigned char *) buffer->address;
 911         } else {
 912 #if (DEBUG & DEBUG_SG)
 913         printk("scsi%d : scatter gather not requested.\n", hostno);
 914 #endif
 915                 buffer = NULL;
 916                 len = SCint->request_bufflen;
 917                 data = (unsigned char *) SCint->request_buffer;
 918         }
 919 
 920 #if (DEBUG & (PHASE_DATAIN | PHASE_DATAOUT))
 921         printk("scsi%d : len = %d\n", hostno, len);
 922 #endif
 923 
 924                 break;
 925 #ifdef LINKED
 926         case LINKED_RIGHT:
 927                 break;
 928         case LINKED_WRONG:
 929                 break;
 930 #endif
 931         }
 932 
 933 /*
 934  *      There are several conditions under which we wish to send a message : 
 935  *      1.  When we are allowing disconnect / reconnect, and need to establish
 936  *          the I_T_L nexus via an IDENTIFY with the DiscPriv bit set.
 937  *
 938  *      2.  When we are doing linked commands, are have the wrong I_T_L nexus
 939  *          established and want to send an ABORT message.
 940  */
 941 
 942         
 943         CONTROL = BASE_CMD | CMD_DRVR_ENABLE | 
 944                 (((reselect == CAN_RECONNECT)
 945 #ifdef LINKED 
 946                 || (reselect == LINKED_WRONG)
 947 #endif 
 948                 )  ? CMD_ATTN : 0) ;
 949         
 950 /*
 951  *      INFORMATION TRANSFER PHASE
 952  *
 953  *      The nasty looking read / write inline assembler loops we use for 
 954  *      DATAIN and DATAOUT phases are approximately 4-5 times as fast as 
 955  *      the 'C' versions - since we're moving 1024 bytes of data, this
 956  *      really adds up.
 957  */
 958 
 959 #if ((DEBUG & PHASE_ETC) == PHASE_ETC)
 960         printk("scsi%d : phase = INFORMATION TRANSFER\n", hostno);
 961 #endif  
 962 
 963         incommand = 1;
 964         transfersize = SCint->transfersize;
 965         underflow = SCint->underflow;
 966 
 967 
 968 /*
 969  *      Now, we poll the device for status information,
 970  *      and handle any requests it makes.  Note that since we are unsure of 
 971  *      how much data will be flowing across the system, etc and cannot 
 972  *      make reasonable timeouts, that we will instead have the midlevel
 973  *      driver handle any timeouts that occur in this phase.
 974  */
 975 
 976         while (((status_read = STATUS) & STAT_BSY) && !st0x_aborted && !done) 
 977                 {
 978 #ifdef PARITY
 979                 if (status_read & STAT_PARITY)
 980                         {
 981                         printk("scsi%d : got parity error\n", hostno);
 982                         st0x_aborted = DID_PARITY;
 983                         }       
 984 #endif
 985 
 986                 if (status_read & STAT_REQ)
 987                         {
 988 #if ((DEBUG & PHASE_ETC) == PHASE_ETC)
 989                         if ((newphase = (status_read & REQ_MASK)) != phase)
 990                                 {
 991                                 phase = newphase;
 992                                 switch (phase)
 993                                 {
 994                                 case REQ_DATAOUT: 
 995                                         printk("scsi%d : phase = DATA OUT\n",
 996                                                 hostno); 
 997                                         break;
 998                                 case REQ_DATAIN : 
 999                                         printk("scsi%d : phase = DATA IN\n",
1000                                                 hostno); 
1001                                         break;
1002                                 case REQ_CMDOUT : 
1003                                         printk("scsi%d : phase = COMMAND OUT\n",
1004                                                 hostno); 
1005                                         break;
1006                                 case REQ_STATIN :
1007                                          printk("scsi%d : phase = STATUS IN\n",
1008                                                 hostno); 
1009                                         break;
1010                                 case REQ_MSGOUT :
1011                                         printk("scsi%d : phase = MESSAGE OUT\n",
1012                                                 hostno); 
1013                                         break;
1014                                 case REQ_MSGIN :
1015                                         printk("scsi%d : phase = MESSAGE IN\n",
1016                                                 hostno);
1017                                         break;
1018                                 default : 
1019                                         printk("scsi%d : phase = UNKNOWN\n",
1020                                                 hostno); 
1021                                         st0x_aborted = DID_ERROR; 
1022                                 }       
1023                                 }
1024 #endif
1025                 switch (status_read & REQ_MASK)
1026                 {                       
1027                 case REQ_DATAOUT : 
1028 /*
1029  * If we are in fast mode, then we simply splat the data out
1030  * in word-sized chunks as fast as we can.
1031  */
1032 
1033 #ifdef FAST 
1034 if (!len) {
1035 #if 0 
1036         printk("scsi%d: underflow to target %d lun %d \n", 
1037                 hostno, target, lun);
1038         st0x_aborted = DID_ERROR;
1039         fast = 0;
1040 #endif
1041         break;
1042 }
1043 
1044 if (fast && transfersize && !(len % transfersize) && (len >= transfersize)
1045 #ifdef FAST32
1046         && !(transfersize % 4)
1047 #endif
1048         ) {
1049 #if (DEBUG & DEBUG_FAST) 
1050         printk("scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
1051                "         len = %d, data = %08x\n", hostno, SCint->underflow, 
1052                SCint->transfersize, len, data);
1053 #endif
1054 
1055         __asm__("
1056         cld;
1057 "
1058 #ifdef FAST32
1059 "       shr $2, %%ecx;
1060 1:      lodsl;
1061         movl %%eax, (%%edi);
1062 "
1063 #else
1064 "1:     lodsb;
1065         movb %%al, (%%edi);
1066 "
1067 #endif
1068 "       loop 1b;" : :
1069         /* input */
1070         "D" (st0x_dr), "S" (data), "c" (SCint->transfersize) :
1071         /* clobbered */
1072         "eax", "ecx", "esi" );
1073 
1074         len -= transfersize;
1075         data += transfersize;
1076 
1077 #if (DEBUG & DEBUG_FAST)
1078         printk("scsi%d : FAST transfer complete len = %d data = %08x\n", 
1079                 hostno, len, data);
1080 #endif
1081 
1082 
1083 } else 
1084 #endif
1085 
1086 {
1087 /*
1088  *      We loop as long as we are in a data out phase, there is data to send, 
1089  *      and BSY is still active.
1090  */
1091                 __asm__ (
1092 
1093 /*
1094         Local variables : 
1095         len = ecx
1096         data = esi
1097         st0x_cr_sr = ebx
1098         st0x_dr =  edi
1099 
1100         Test for any data here at all.
1101 */
1102         "\torl %%ecx, %%ecx
1103         jz 2f
1104 
1105         cld
1106 
1107         movl _st0x_cr_sr, %%ebx
1108         movl _st0x_dr, %%edi
1109         
1110 1:      movb (%%ebx), %%al\n"
1111 /*
1112         Test for BSY
1113 */
1114 
1115         "\ttest $1, %%al
1116         jz 2f\n"
1117 
1118 /*
1119         Test for data out phase - STATUS & REQ_MASK should be REQ_DATAOUT, which is 0.
1120 */
1121         "\ttest $0xe, %%al
1122         jnz 2f  \n"
1123 /*
1124         Test for REQ
1125 */      
1126         "\ttest $0x10, %%al
1127         jz 1b
1128         lodsb
1129         movb %%al, (%%edi) 
1130         loop 1b
1131 
1132 2: 
1133                                                                         ":
1134 /* output */
1135 "=S" (data), "=c" (len) :
1136 /* input */
1137 "0" (data), "1" (len) :
1138 /* clobbered */
1139 "eax", "ebx", "edi"); 
1140 }
1141 
1142                         if (!len && nobuffs) {
1143                                 --nobuffs;
1144                                 ++buffer;
1145                                 len = buffer->length;
1146                                 data = (unsigned char *) buffer->address;
1147 #if (DEBUG & DEBUG_SG)
1148         printk("scsi%d : next scatter-gather buffer len = %d address = %08x\n",
1149                 hostno, len, data);
1150 #endif
1151                         }
1152                         break;
1153 
1154                 case REQ_DATAIN : 
1155 #ifdef SLOW_HANDSHAKE
1156         if (borken) {
1157 #if (DEBUG & (PHASE_DATAIN))
1158                 transfered += len;
1159 #endif
1160                 for (; len && (STATUS & (REQ_MASK | STAT_REQ)) == (REQ_DATAIN |
1161                         STAT_REQ); --len) {
1162                                 *data++ = DATA;
1163                                 borken_wait();
1164 }
1165 #if (DEBUG & (PHASE_DATAIN))
1166                 transfered -= len;
1167 #endif
1168         } else
1169 #endif
1170 #ifdef FAST
1171 if (fast && transfersize && !(len % transfersize) && (len >= transfersize)
1172 #ifdef FAST32
1173         && !(transfersize % 4)
1174 #endif
1175         ) {
1176 #if (DEBUG & DEBUG_FAST) 
1177         printk("scsi%d : FAST transfer, underflow = %d, transfersize = %d\n"
1178                "         len = %d, data = %08x\n", hostno, SCint->underflow, 
1179                SCint->transfersize, len, data);
1180 #endif
1181         __asm__("
1182         cld;
1183 "
1184 #ifdef FAST32
1185 "       shr $2, %%ecx;
1186 1:      movl (%%esi), %%eax;
1187         stosl;
1188 "
1189 #else
1190 "1:     movb (%%esi), %%al;
1191         stosb;
1192 "
1193 #endif
1194 
1195 "       loop 1b;" : :
1196         /* input */
1197         "S" (st0x_dr), "D" (data), "c" (SCint->transfersize) :
1198         /* clobbered */
1199         "eax", "ecx", "edi");
1200 
1201         len -= transfersize;
1202         data += transfersize;
1203 
1204 #if (DEBUG & PHASE_DATAIN)
1205         printk("scsi%d: transfered += %d\n", hostno, transfersize);
1206         transfered += transfersize;
1207 #endif
1208 
1209 #if (DEBUG & DEBUG_FAST)
1210         printk("scsi%d : FAST transfer complete len = %d data = %08x\n", 
1211                 hostno, len, data);
1212 #endif
1213 
1214 } else
1215 #endif
1216 {
1217 
1218 #if (DEBUG & PHASE_DATAIN)
1219         printk("scsi%d: transfered += %d\n", hostno, len);
1220         transfered += len;      /* Assume we'll transfer it all, then
1221                                    subtract what we *didn't* transfer */
1222 #endif
1223         
1224 /*
1225  *      We loop as long as we are in a data in phase, there is room to read, 
1226  *      and BSY is still active
1227  */
1228  
1229                         __asm__ (
1230 /*
1231         Local variables : 
1232         ecx = len
1233         edi = data
1234         esi = st0x_cr_sr
1235         ebx = st0x_dr
1236 
1237         Test for room to read
1238 */
1239         "\torl %%ecx, %%ecx
1240         jz 2f
1241 
1242         cld
1243         movl _st0x_cr_sr, %%esi
1244         movl _st0x_dr, %%ebx
1245 
1246 1:      movb (%%esi), %%al\n"
1247 /*
1248         Test for BSY
1249 */
1250 
1251         "\ttest $1, %%al 
1252         jz 2f\n"
1253 
1254 /*
1255         Test for data in phase - STATUS & REQ_MASK should be REQ_DATAIN, = STAT_IO, which is 4.
1256 */
1257         "\tmovb $0xe, %%ah      
1258         andb %%al, %%ah
1259         cmpb $0x04, %%ah
1260         jne 2f\n"
1261                 
1262 /*
1263         Test for REQ
1264 */      
1265         "\ttest $0x10, %%al
1266         jz 1b
1267 
1268         movb (%%ebx), %%al      
1269         stosb   
1270         loop 1b\n"
1271 
1272 "2:\n"
1273                                                                         :
1274 /* output */
1275 "=D" (data), "=c" (len) :
1276 /* input */
1277 "0" (data), "1" (len) :
1278 /* clobbered */
1279 "eax","ebx", "esi"); 
1280 
1281 #if (DEBUG & PHASE_DATAIN)
1282         printk("scsi%d: transfered -= %d\n", hostno, len);
1283         transfered -= len;              /* Since we assumed all of Len got 
1284                                          * transfered, correct our mistake */
1285 #endif
1286 }
1287         
1288                         if (!len && nobuffs) {
1289                                 --nobuffs;
1290                                 ++buffer;
1291                                 len = buffer->length;
1292                                 data = (unsigned char *) buffer->address;
1293 #if (DEBUG & DEBUG_SG)
1294         printk("scsi%d : next scatter-gather buffer len = %d address = %08x\n",
1295                 hostno, len, data);
1296 #endif
1297                         }
1298 
1299                         break;
1300 
1301                 case REQ_CMDOUT : 
1302                         while (((status_read = STATUS) & STAT_BSY) && 
1303                                ((status_read & REQ_MASK) == REQ_CMDOUT))
1304                                 if (status_read & STAT_REQ) {
1305                                         DATA = *(unsigned char *) cmnd;
1306                                         cmnd = 1+(unsigned char *) cmnd;
1307 #ifdef SLOW_HANDSHAKE
1308                                         if (borken) 
1309                                                 borken_wait();
1310 #endif
1311                                 }
1312                         break;
1313         
1314                 case REQ_STATIN : 
1315                         status = DATA;
1316                         break;
1317                                 
1318                 case REQ_MSGOUT : 
1319 /*
1320  *      We can only have sent a MSG OUT if we requested to do this 
1321  *      by raising ATTN.  So, we must drop ATTN.
1322  */
1323 
1324                         CONTROL = BASE_CMD | CMD_DRVR_ENABLE;
1325 /*
1326  *      If we are reconnecting, then we must send an IDENTIFY message in 
1327  *       response  to MSGOUT.
1328  */
1329                         switch (reselect) {
1330                         case CAN_RECONNECT:
1331                                 DATA = IDENTIFY(1, lun);
1332 
1333 #if (DEBUG & (PHASE_RESELECT | PHASE_MSGOUT)) 
1334                                 printk("scsi%d : sent IDENTIFY message.\n", hostno);
1335 #endif
1336                                 break;
1337 #ifdef LINKED
1338                         case LINKED_WRONG:
1339                                 DATA = ABORT;
1340                                 linked_connected = 0;
1341                                 reselect = CAN_RECONNECT;
1342                                 goto connect_loop;
1343 #if (DEBUG & (PHASE_MSGOUT | DEBUG_LINKED))
1344                                 printk("scsi%d : sent ABORT message to cancel incorrect I_T_L nexus.\n", hostno);
1345 #endif
1346 #endif /* LINKED */
1347 #if (DEBUG & DEBUG_LINKED) 
1348             printk("correct\n");
1349 #endif
1350                         default:
1351                                 DATA = NOP;
1352                                 printk("scsi%d : target %d requested MSGOUT, sent NOP message.\n", hostno, target);
1353                         }
1354                         break;
1355                                         
1356                 case REQ_MSGIN : 
1357                         switch (message = DATA) {
1358                         case DISCONNECT :
1359                                 should_reconnect = 1;
1360                                 current_data = data;    /* WDE add */
1361                                 current_buffer = buffer;
1362                                 current_bufflen = len;  /* WDE add */
1363                                 current_nobuffs = nobuffs;
1364 #ifdef LINKED
1365                                 linked_connected = 0;
1366 #endif
1367                                 done=1;
1368 #if (DEBUG & (PHASE_RESELECT | PHASE_MSGIN))
1369                                 printk("scsi%d : disconnected.\n", hostno);
1370 #endif
1371                                 break;
1372 
1373 #ifdef LINKED
1374                         case LINKED_CMD_COMPLETE:
1375                         case LINKED_FLG_CMD_COMPLETE:
1376 #endif
1377                         case COMMAND_COMPLETE :
1378 /*
1379  * Note : we should check for underflow here.   
1380  */
1381 #if (DEBUG & PHASE_MSGIN)       
1382                                 printk("scsi%d : command complete.\n", hostno);
1383 #endif
1384                                 done = 1;
1385                                 break;
1386                         case ABORT :
1387 #if (DEBUG & PHASE_MSGIN)
1388                                 printk("scsi%d : abort message.\n", hostno);
1389 #endif
1390                                 done=1;
1391                                 break;
1392                         case SAVE_POINTERS :
1393                                 current_buffer = buffer;
1394                                 current_bufflen = len;  /* WDE add */
1395                                 current_data = data;    /* WDE mod */
1396                                 current_nobuffs = nobuffs;
1397 #if (DEBUG & PHASE_MSGIN)
1398                                 printk("scsi%d : pointers saved.\n", hostno);
1399 #endif 
1400                                 break;
1401                         case RESTORE_POINTERS:
1402                                 buffer=current_buffer;
1403                                 cmnd=current_cmnd;
1404                                 data=current_data;      /* WDE mod */
1405                                 len=current_bufflen;
1406                                 nobuffs=current_nobuffs;
1407 #if (DEBUG & PHASE_MSGIN)
1408                                 printk("scsi%d : pointers restored.\n", hostno);
1409 #endif
1410                                 break;
1411                         default:
1412 
1413 /*
1414  *      IDENTIFY distinguishes itself from the other messages by setting the
1415  *      high byte.
1416  *      
1417  *      Note : we need to handle at least one outstanding command per LUN,
1418  *      and need to hash the SCSI command for that I_T_L nexus based on the 
1419  *      known ID (at this point) and LUN.
1420  */
1421 
1422                                 if (message & 0x80) {
1423 #if (DEBUG & PHASE_MSGIN)
1424                                         printk("scsi%d : IDENTIFY message received from id %d, lun %d.\n",
1425                                                 hostno, target, message & 7);
1426 #endif
1427                                 } else {
1428 
1429 /*
1430  *      We should go into a MESSAGE OUT phase, and send  a MESSAGE_REJECT 
1431  *      if we run into a message that we don't like.  The seagate driver 
1432  *      needs some serious restructuring first though.
1433  */
1434 
1435 #if (DEBUG & PHASE_MSGIN)
1436                                         printk("scsi%d : unknown message %d from target %d.\n",
1437                                                 hostno,  message,   target);
1438 #endif  
1439                                 }
1440                         }
1441                         break;
1442 
1443                 default : 
1444                         printk("scsi%d : unknown phase.\n", hostno); 
1445                         st0x_aborted = DID_ERROR; 
1446                 }       
1447 
1448 #ifdef SLOW_HANDSHAKE
1449 /*
1450  * I really don't care to deal with borken devices in each single 
1451  * byte transfer case (ie, message in, message out, status), so
1452  * I'll do the wait here if necessary.
1453  */
1454                 if (borken)
1455                         borken_wait();
1456 #endif
1457  
1458                 } /* if ends */
1459                 } /* while ends */
1460 
1461 #if (DEBUG & (PHASE_DATAIN | PHASE_DATAOUT | PHASE_EXIT))
1462         printk("scsi%d : Transfered %d bytes\n", hostno, transfered);
1463 #endif
1464 
1465 #if (DEBUG & PHASE_EXIT)
1466 #if 0           /* Doesn't work for scatter / gather */
1467         printk("Buffer : \n");
1468         for (i = 0; i < 20; ++i) 
1469                 printk ("%02x  ", ((unsigned char *) data)[i]); /* WDE mod */
1470         printk("\n");
1471 #endif
1472         printk("scsi%d : status = ", hostno);
1473         print_status(status);
1474         printk("message = %02x\n", message);
1475 #endif
1476 
1477 
1478 /* We shouldn't reach this until *after* BSY has been deasserted */
1479 #ifdef notyet
1480         if (st0x_aborted) {
1481                 if (STATUS & STAT_BSY) {        
1482                         seagate_st0x_reset(NULL);
1483                         st0x_aborted = DID_RESET;
1484                 } 
1485                 abort_confirm = 1;
1486         } 
1487 #endif
1488 
1489 #ifdef LINKED
1490 else {
1491 /*
1492  * Fix the message byte so that unsuspecting high level drivers don't 
1493  * puke when they see a LINKED COMMAND message in place of the COMMAND 
1494  * COMPLETE they may be expecting.  Shouldn't be necessary, but it's 
1495  * better to be on the safe side. 
1496  *
1497  * A non LINKED* message byte will indicate that the command completed, 
1498  * and we are now disconnected.
1499  */
1500 
1501                 switch (message) {
1502                 case LINKED_CMD_COMPLETE :
1503                 case LINKED_FLG_CMD_COMPLETE : 
1504                         message = COMMAND_COMPLETE;
1505                         linked_target = current_target;
1506                         linked_lun = current_lun;
1507                         linked_connected = 1;
1508 #if (DEBUG & DEBUG_LINKED)
1509                         printk("scsi%d : keeping I_T_L nexus established for linked command.\n", 
1510                                 hostno);
1511 #endif
1512 /*
1513  * We also will need to adjust status to accommodate intermediate conditions.
1514  */
1515                         if ((status == INTERMEDIATE_GOOD) ||
1516                                 (status == INTERMEDIATE_C_GOOD))
1517                                 status = GOOD;
1518                         
1519                         break;
1520 /*
1521  * We should also handle what are "normal" termination messages 
1522  * here (ABORT, BUS_DEVICE_RESET?, and COMMAND_COMPLETE individually, 
1523  * and flake if things aren't right.
1524  */
1525 
1526                 default :
1527 #if (DEBUG & DEBUG_LINKED)
1528                         printk("scsi%d : closing I_T_L nexus.\n", hostno);
1529 #endif
1530                         linked_connected = 0;
1531                 }
1532         }
1533 #endif /* LINKED */
1534 
1535 
1536 
1537 
1538         if (should_reconnect) {
1539 #if (DEBUG & PHASE_RESELECT)
1540                 printk("scsi%d : exiting seagate_st0x_queue_command() with reconnect enabled.\n",
1541                         hostno);
1542 #endif
1543                 CONTROL = BASE_CMD | CMD_INTR ;
1544         } else 
1545                 CONTROL = BASE_CMD;
1546 
1547         return retcode (st0x_aborted);
1548         }
1549 
1550 int seagate_st0x_abort (Scsi_Cmnd * SCpnt)
     /* [previous][next][first][last][top][bottom][index][help] */
1551         {
1552           st0x_aborted = DID_ABORT;
1553           
1554           return SCSI_ABORT_PENDING;
1555         }
1556 
1557 /*
1558         the seagate_st0x_reset function resets the SCSI bus
1559 */
1560         
1561 int seagate_st0x_reset (Scsi_Cmnd * SCpnt)
     /* [previous][next][first][last][top][bottom][index][help] */
1562         {
1563         unsigned clock;
1564         /*
1565                 No timeouts - this command is going to fail because 
1566                 it was reset.
1567         */
1568 
1569 #ifdef DEBUG
1570         printk("In seagate_st0x_reset()\n");
1571 #endif
1572 
1573 
1574         /* assert  RESET signal on SCSI bus.  */
1575                 
1576         CONTROL = BASE_CMD  | CMD_RST;
1577         clock=jiffies+2;
1578 
1579         
1580         /* Wait.  */
1581         
1582         while (jiffies < clock);
1583 
1584         CONTROL = BASE_CMD;
1585         
1586         st0x_aborted = DID_RESET;
1587 
1588 #ifdef DEBUG
1589         printk("SCSI bus reset.\n");
1590 #endif
1591         return SCSI_RESET_WAKEUP;
1592         }
1593 
1594 #include <asm/segment.h>
1595 #include "sd.h"
1596 #include "scsi_ioctl.h"
1597 
1598 int seagate_st0x_biosparam(Disk * disk, int dev, int* ip) {
     /* [previous][next][first][last][top][bottom][index][help] */
1599   unsigned char buf[256 + sizeof(int) * 2], cmd[6], *data, *page;
1600   int *sizes, result, formatted_sectors, total_sectors;
1601   int cylinders, heads, sectors;
1602 
1603 /*
1604  * Only SCSI-I CCS drives and later implement the necessary mode sense 
1605  * pages.  
1606  */
1607 
1608   if (disk->device->scsi_level < 2) 
1609         return -1;
1610 
1611   sizes = (int *) buf;
1612   data = (unsigned char *) (sizes + 2);
1613 
1614   cmd[0] = MODE_SENSE;
1615   cmd[1] = (disk->device->lun << 5) & 0xe5;
1616   cmd[2] = 0x04; /* Read page 4, rigid disk geometry page current values */
1617   cmd[3] = 0;
1618   cmd[4] = 255;
1619   cmd[5] = 0;
1620 
1621 /*
1622  * We are transferring 0 bytes in the out direction, and expect to get back
1623  * 24 bytes for each mode page.
1624  */
1625 
1626   sizes[0] = 0;
1627   sizes[1] = 256;
1628 
1629   memcpy (data, cmd, 6);
1630 
1631   if (!(result = kernel_scsi_ioctl (disk->device, SCSI_IOCTL_SEND_COMMAND, (void *) buf))) {
1632 /*
1633  * The mode page lies beyond the MODE SENSE header, with length 4, and 
1634  * the BLOCK DESCRIPTOR, with length header[3].
1635  */
1636 
1637     page = data + 4 + data[3];
1638     heads = (int) page[5];
1639     cylinders = (page[2] << 16) | (page[3] << 8) | page[4];
1640 
1641     cmd[2] = 0x03; /* Read page 3, format page current values */
1642     memcpy (data, cmd, 6);
1643 
1644     if (!(result = kernel_scsi_ioctl (disk->device, SCSI_IOCTL_SEND_COMMAND, (void *) buf))) {
1645       page = data + 4 + data[3];
1646       sectors = (page[10] << 8) | page[11];     
1647 
1648         
1649 /*
1650  * Get the total number of formatted sectors from the block descriptor, 
1651  * so we can tell how many are being used for alternates.  
1652  */
1653 
1654       formatted_sectors = (data[4 + 1] << 16) | (data[4 + 2] << 8) |
1655         data[4 + 3] ;
1656 
1657       total_sectors = (heads * cylinders * sectors);
1658 
1659 /*
1660  * Adjust the real geometry by subtracting 
1661  * (spare sectors / (heads * tracks)) cylinders from the number of cylinders.
1662  *
1663  * It appears that the CE cylinder CAN be a partial cylinder.
1664  */
1665 
1666      
1667 printk("scsi%d : heads = %d cylinders = %d sectors = %d total = %d formatted = %d\n",
1668     hostno, heads, cylinders, sectors, total_sectors, formatted_sectors);
1669 
1670       if (!heads || !sectors || !cylinders)
1671         result = -1;
1672       else
1673         cylinders -= ((total_sectors - formatted_sectors) / (heads * sectors));
1674 
1675 /*
1676  * Now, we need to do a sanity check on the geometry to see if it is 
1677  * BIOS compatible.  The maximum BIOS geometry is 1024 cylinders * 
1678  * 256 heads * 64 sectors. 
1679  */
1680 
1681       if ((cylinders > 1024) || (sectors > 64)) 
1682         result = -1;
1683       else {
1684         ip[0] = heads;
1685         ip[1] = sectors;
1686         ip[2] = cylinders;
1687       }
1688 
1689 /* 
1690  * There should be an alternate mapping for things the seagate doesn't
1691  * understand, but I couldn't say what it is with reasonable certainty.
1692  */
1693 
1694       }
1695     }
1696     
1697   return result;
1698 }

/* [previous][next][first][last][top][bottom][index][help] */