drivers/scsi/seagate.c

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

DEFINITIONS
