drivers/scsi/aha1542.c

/* */
This source file includes following definitions.
aha1542_stat
aha1542_out
aha1542_in
aha1542_in1
makecode
aha1542_test_port
aha1542_intr_handle
aha1542_queuecommand
internal_done
aha1542_command
setup_mailboxes
aha1542_getconfig
aha1542_mbenable
aha1542_query
aha1542_setup
aha1542_detect
aha1542_restart
aha1542_abort
aha1542_reset
aha1542_biosparam
   1 /* $Id: aha1542.c,v 1.1 1992/07/24 06:27:38 root Exp root $
   2  *  linux/kernel/aha1542.c
   3  *
   4  *  Copyright (C) 1992  Tommy Thorn
   5  *  Copyright (C) 1993, 1994, 1995 Eric Youngdale
   6  *
   7  *  Modified by Eric Youngdale
   8  *        Use request_irq and request_dma to help prevent unexpected conflicts
   9  *        Set up on-board DMA controller, such that we do not have to
  10  *        have the bios enabled to use the aha1542.
  11  *  Modified by David Gentzel
  12  *        Don't call request_dma if dma mask is 0 (for BusLogic BT-445S VL-Bus
  13  *        controller).
  14  *  Modified by Matti Aarnio
  15  *        Accept parameters from LILO cmd-line. -- 1-Oct-94
  16  */
  17 
  18 #ifdef MODULE
  19 #include <linux/autoconf.h>
  20 #include <linux/module.h>
  21 #endif
  22 
  23 #include <linux/kernel.h>
  24 #include <linux/head.h>
  25 #include <linux/types.h>
  26 #include <linux/string.h>
  27 #include <linux/ioport.h>
  28 #include <linux/delay.h>
  29 #include <linux/sched.h>
  30 #include <linux/proc_fs.h>
  31 #include <asm/dma.h>
  32 #include <asm/system.h>
  33 #include <asm/io.h>
  34 #include "../block/blk.h"
  35 #include "scsi.h"
  36 #include "hosts.h"
  37 
  38 
  39 #include "aha1542.h"
  40 
  41 #include<linux/stat.h>
  42 
  43 struct proc_dir_entry proc_scsi_aha1542 = {
  44     PROC_SCSI_AHA1542, 7, "aha1542",
  45     S_IFDIR | S_IRUGO | S_IXUGO, 2
  46 };
  47 
  48 #ifdef DEBUG
  49 #define DEB(x) x
  50 #else
  51 #define DEB(x)
  52 #endif
  53 /*
  54 static const char RCSid[] = "$Header: /usr/src/linux/kernel/blk_drv/scsi/RCS/aha1542.c,v 1.1 1992/07/24 06:27:38 root Exp root $";
  55 */
  56 
  57 /* The adaptec can be configured for quite a number of addresses, but
  58 I generally do not want the card poking around at random.  We allow
  59 two addresses - this allows people to use the Adaptec with a Midi
  60 card, which also used 0x330 -- can be overridden with LILO! */
  61 
  62 #define MAXBOARDS 2     /* Increase this and the sizes of the
  63                            arrays below, if you need more.. */
  64 
  65 static unsigned int bases[MAXBOARDS]={0x330, 0x334};
  66 
  67 /* set by aha1542_setup according to the command line */
  68 static int setup_called[MAXBOARDS]   = {0,0};
  69 static int setup_buson[MAXBOARDS]    = {0,0};
  70 static int setup_busoff[MAXBOARDS]   = {0,0};
  71 static int setup_dmaspeed[MAXBOARDS] = {-1,-1};
  72 
  73 static char *setup_str[MAXBOARDS] = {(char *)NULL,(char *)NULL};
  74 
  75 /*
  76  * LILO params:  aha1542=<PORTBASE>[,<BUSON>,<BUSOFF>[,<DMASPEED>]]
  77  *
  78  * Where:  <PORTBASE> is any of the valid AHA addresses:
  79  *                      0x130, 0x134, 0x230, 0x234, 0x330, 0x334
  80  *         <BUSON>  is the time (in microsecs) that AHA spends on the AT-bus
  81  *                  when transferring data.  1542A power-on default is 11us,
  82  *                  valid values are in range: 2..15 (decimal)
  83  *         <BUSOFF> is the time that AHA spends OFF THE BUS after while
  84  *                  it is transferring data (not to monopolize the bus).
  85  *                  Power-on default is 4us, valid range: 1..64 microseconds.
  86  *         <DMASPEED> Default is jumper selected (1542A: on the J1),
  87  *                  but experimenter can alter it with this.
  88  *                  Valid values: 5, 6, 7, 8, 10 (MB/s)
  89  *                  Factory default is 5 MB/s.
  90  */
  91 
  92 
  93 /* The DMA-Controller.  We need to fool with this because we want to 
  94    be able to use the aha1542 without having to have the bios enabled */
  95 #define DMA_MODE_REG    0xd6
  96 #define DMA_MASK_REG    0xd4
  97 #define CASCADE         0xc0
  98 
  99 #define BIOS_TRANSLATION_1632 0  /* Used by some old 1542A boards */
 100 #define BIOS_TRANSLATION_6432 1 /* Default case these days */
 101 #define BIOS_TRANSLATION_25563 2 /* Big disk case */
 102 
 103 struct aha1542_hostdata{
 104         /* This will effectively start both of them at the first mailbox */
 105         int bios_translation;   /* Mapping bios uses - for compatibility */
 106         int aha1542_last_mbi_used;
 107         int aha1542_last_mbo_used;
 108         Scsi_Cmnd * SCint[AHA1542_MAILBOXES];
 109         struct mailbox mb[2*AHA1542_MAILBOXES];
 110         struct ccb ccb[AHA1542_MAILBOXES];
 111 };
 112 
 113 #define HOSTDATA(host) ((struct aha1542_hostdata *) &host->hostdata)
 114 
 115 static struct Scsi_Host * aha_host[7] = {NULL,};  /* One for each IRQ level (9-15) */
 116 
 117 
 118 
 119 
 120 #define WAITnexttimeout 3000000
 121 
 122 static void setup_mailboxes(int base_io, struct Scsi_Host * shpnt);
 123 static int aha1542_restart(struct Scsi_Host * shost);
 124 
 125 #define aha1542_intr_reset(base)  outb(IRST, CONTROL(base))
 126 
 127 #define WAIT(port, mask, allof, noneof)                                 \
 128  { register WAITbits;                                                   \
 129    register WAITtimeout = WAITnexttimeout;                              \
 130    while (1) {                                                          \
 131      WAITbits = inb(port) & (mask);                                     \
 132      if ((WAITbits & (allof)) == (allof) && ((WAITbits & (noneof)) == 0)) \
 133        break;                                                           \
 134      if (--WAITtimeout == 0) goto fail;                                 \
 135    }                                                                    \
 136  }
 137 
 138 /* Similar to WAIT, except we use the udelay call to regulate the
 139    amount of time we wait.  */
 140 #define WAITd(port, mask, allof, noneof, timeout)                       \
 141  { register WAITbits;                                                   \
 142    register WAITtimeout = timeout;                                      \
 143    while (1) {                                                          \
 144      WAITbits = inb(port) & (mask);                                     \
 145      if ((WAITbits & (allof)) == (allof) && ((WAITbits & (noneof)) == 0)) \
 146        break;                                                           \
 147      udelay(1000);                                                      \
 148      if (--WAITtimeout == 0) goto fail;                                 \
 149    }                                                                    \
 150  }
 151 
 152 static void aha1542_stat(void)
     /*  */
 153 {
 154 /*    int s = inb(STATUS), i = inb(INTRFLAGS);
 155   printk("status=%x intrflags=%x\n", s, i, WAITnexttimeout-WAITtimeout); */
 156 }
 157 
 158 /* This is a bit complicated, but we need to make sure that an interrupt
 159    routine does not send something out while we are in the middle of this.
 160    Fortunately, it is only at boot time that multi-byte messages
 161    are ever sent. */
 162 static int aha1542_out(unsigned int base, unchar *cmdp, int len)
     /*  */
 163 {
 164   unsigned long flags = 0;
 165   
 166   save_flags(flags);
 167   if(len == 1) {
 168     while(1==1){
 169         WAIT(STATUS(base), CDF, 0, CDF);
 170         cli();
 171         if(inb(STATUS(base)) & CDF) {restore_flags(flags); continue;}
 172         outb(*cmdp, DATA(base));
 173         restore_flags(flags);
 174         return 0;
 175       }
 176   } else {
 177     cli();
 178     while (len--)
 179       {
 180         WAIT(STATUS(base), CDF, 0, CDF);
 181         outb(*cmdp++, DATA(base));
 182       }
 183     restore_flags(flags);
 184   }
 185     return 0;
 186   fail:
 187     restore_flags(flags);
 188     printk("aha1542_out failed(%d): ", len+1); aha1542_stat();
 189     return 1;
 190 }
 191 
 192 /* Only used at boot time, so we do not need to worry about latency as much
 193    here */
 194 static int aha1542_in(unsigned int base, unchar *cmdp, int len)
     /*  */
 195 {
 196     unsigned long flags;
 197 
 198     save_flags(flags);
 199     cli();
 200     while (len--)
 201       {
 202           WAIT(STATUS(base), DF, DF, 0);
 203           *cmdp++ = inb(DATA(base));
 204       }
 205     restore_flags(flags);
 206     return 0;
 207   fail:
 208     restore_flags(flags);
 209     printk("aha1542_in failed(%d): ", len+1); aha1542_stat();
 210     return 1;
 211 }
 212 
 213 /* Similar to aha1542_in, except that we wait a very short period of time.
 214    We use this if we know the board is alive and awake, but we are not sure
 215    if the board will respond the the command we are about to send or not */
 216 static int aha1542_in1(unsigned int base, unchar *cmdp, int len)
     /*  */
 217 {
 218     unsigned long flags;
 219     
 220     save_flags(flags);
 221     cli();
 222     while (len--)
 223       {
 224           WAITd(STATUS(base), DF, DF, 0, 100);
 225           *cmdp++ = inb(DATA(base));
 226       }
 227     restore_flags(flags);
 228     return 0;
 229   fail:
 230     restore_flags(flags);
 231     return 1;
 232 }
 233 
 234 static int makecode(unsigned hosterr, unsigned scsierr)
     /*  */
 235 {
 236     switch (hosterr) {
 237       case 0x0:
 238       case 0xa: /* Linked command complete without error and linked normally */
 239       case 0xb: /* Linked command complete without error, interrupt generated */
 240         hosterr = 0;
 241         break;
 242 
 243       case 0x11: /* Selection time out-The initiator selection or target
 244                     reselection was not complete within the SCSI Time out period */
 245         hosterr = DID_TIME_OUT;
 246         break;
 247 
 248       case 0x12: /* Data overrun/underrun-The target attempted to transfer more data
 249                     than was allocated by the Data Length field or the sum of the
 250                     Scatter / Gather Data Length fields. */
 251 
 252       case 0x13: /* Unexpected bus free-The target dropped the SCSI BSY at an unexpected time. */
 253 
 254       case 0x15: /* MBO command was not 00, 01 or 02-The first byte of the CB was
 255                     invalid. This usually indicates a software failure. */
 256 
 257       case 0x16: /* Invalid CCB Operation Code-The first byte of the CCB was invalid.
 258                     This usually indicates a software failure. */
 259 
 260       case 0x17: /* Linked CCB does not have the same LUN-A subsequent CCB of a set
 261                     of linked CCB's does not specify the same logical unit number as
 262                     the first. */
 263       case 0x18: /* Invalid Target Direction received from Host-The direction of a
 264                     Target Mode CCB was invalid. */
 265 
 266       case 0x19: /* Duplicate CCB Received in Target Mode-More than once CCB was
 267                     received to service data transfer between the same target LUN
 268                     and initiator SCSI ID in the same direction. */
 269 
 270       case 0x1a: /* Invalid CCB or Segment List Parameter-A segment list with a zero
 271                     length segment or invalid segment list boundaries was received.
 272                     A CCB parameter was invalid. */
 273         DEB(printk("Aha1542: %x %x\n", hosterr, scsierr));
 274         hosterr = DID_ERROR; /* Couldn't find any better */
 275         break;
 276 
 277       case 0x14: /* Target bus phase sequence failure-An invalid bus phase or bus
 278                     phase sequence was requested by the target. The host adapter
 279                     will generate a SCSI Reset Condition, notifying the host with
 280                     a SCRD interrupt */
 281         hosterr = DID_RESET;
 282         break;
 283       default:
 284         printk("makecode: unknown hoststatus %x\n", hosterr);
 285         break;
 286     }
 287     return scsierr|(hosterr << 16);
 288 }
 289 
 290 static int aha1542_test_port(int bse, struct Scsi_Host * shpnt)
     /*  */
 291 {
 292     int i;
 293     unchar inquiry_cmd[] = {CMD_INQUIRY };
 294     unchar inquiry_result[4];
 295     unchar *cmdp;
 296     int len;
 297     volatile int debug = 0;
 298     
 299     /* Quick and dirty test for presence of the card. */
 300     if(inb(STATUS(bse)) == 0xff) return 0;
 301 
 302     /* Reset the adapter. I ought to make a hard reset, but it's not really necessary */
 303     
 304     /*  DEB(printk("aha1542_test_port called \n")); */
 305 
 306     /* In case some other card was probing here, reset interrupts */
 307     aha1542_intr_reset(bse);     /* reset interrupts, so they don't block */    
 308 
 309     outb(SRST|IRST/*|SCRST*/, CONTROL(bse));
 310 
 311     i = jiffies + 2;
 312     while (i>jiffies); /* Wait a little bit for things to settle down. */
 313     
 314     debug = 1;
 315     /* Expect INIT and IDLE, any of the others are bad */
 316     WAIT(STATUS(bse), STATMASK, INIT|IDLE, STST|DIAGF|INVDCMD|DF|CDF);
 317     
 318     debug = 2;
 319     /* Shouldn't have generated any interrupts during reset */
 320     if (inb(INTRFLAGS(bse))&INTRMASK) goto fail;
 321 
 322 
 323     /* Perform a host adapter inquiry instead so we do not need to set
 324        up the mailboxes ahead of time */
 325 
 326     aha1542_out(bse, inquiry_cmd, 1);
 327 
 328     debug = 3;
 329     len = 4;
 330     cmdp = &inquiry_result[0];
 331 
 332     while (len--)
 333       {
 334           WAIT(STATUS(bse), DF, DF, 0);
 335           *cmdp++ = inb(DATA(bse));
 336       }
 337     
 338     debug = 8;
 339     /* Reading port should reset DF */
 340     if (inb(STATUS(bse)) & DF) goto fail;
 341     
 342     debug = 9;
 343     /* When HACC, command is completed, and we're though testing */
 344     WAIT(INTRFLAGS(bse), HACC, HACC, 0);
 345     /* now initialize adapter */
 346     
 347     debug = 10;
 348     /* Clear interrupts */
 349     outb(IRST, CONTROL(bse));
 350     
 351     debug = 11;
 352 
 353     return debug;                               /* 1 = ok */
 354   fail:
 355     return 0;                                   /* 0 = not ok */
 356 }
 357 
 358 /* A "high" level interrupt handler */
 359 static void aha1542_intr_handle(int irq, struct pt_regs *regs)
     /*  */
 360 {
 361     void (*my_done)(Scsi_Cmnd *) = NULL;
 362     int errstatus, mbi, mbo, mbistatus;
 363     int number_serviced;
 364     unsigned int flags;
 365     struct Scsi_Host * shost;
 366     Scsi_Cmnd * SCtmp;
 367     int flag;
 368     int needs_restart;
 369     struct mailbox * mb;
 370     struct ccb  *ccb;
 371 
 372     shost = aha_host[irq - 9];
 373     if(!shost) panic("Splunge!");
 374 
 375     mb = HOSTDATA(shost)->mb;
 376     ccb = HOSTDATA(shost)->ccb;
 377 
 378 #ifdef DEBUG
 379     {
 380     flag = inb(INTRFLAGS(shost->io_port));
 381     printk("aha1542_intr_handle: ");
 382     if (!(flag&ANYINTR)) printk("no interrupt?");
 383     if (flag&MBIF) printk("MBIF ");
 384     if (flag&MBOA) printk("MBOF ");
 385     if (flag&HACC) printk("HACC ");
 386     if (flag&SCRD) printk("SCRD ");
 387     printk("status %02x\n", inb(STATUS(shost->io_port)));
 388   };
 389 #endif
 390     number_serviced = 0;
 391     needs_restart = 0;
 392 
 393     while(1==1){
 394       flag = inb(INTRFLAGS(shost->io_port));
 395 
 396       /* Check for unusual interrupts.  If any of these happen, we should
 397          probably do something special, but for now just printing a message
 398          is sufficient.  A SCSI reset detected is something that we really
 399          need to deal with in some way. */
 400       if (flag & ~MBIF) {
 401         if (flag&MBOA) printk("MBOF ");
 402         if (flag&HACC) printk("HACC ");
 403         if (flag&SCRD) {
 404           needs_restart = 1;
 405           printk("SCRD ");
 406         }
 407       }
 408 
 409       aha1542_intr_reset(shost->io_port);
 410 
 411       save_flags(flags);
 412       cli();
 413       mbi = HOSTDATA(shost)->aha1542_last_mbi_used + 1;
 414       if (mbi >= 2*AHA1542_MAILBOXES) mbi = AHA1542_MAILBOXES;
 415       
 416       do{
 417         if(mb[mbi].status != 0) break;
 418         mbi++;
 419         if (mbi >= 2*AHA1542_MAILBOXES) mbi = AHA1542_MAILBOXES;
 420       } while (mbi != HOSTDATA(shost)->aha1542_last_mbi_used);
 421       
 422       if(mb[mbi].status == 0){
 423         restore_flags(flags);
 424         /* Hmm, no mail.  Must have read it the last time around */
 425         if (!number_serviced && !needs_restart)
 426           printk("aha1542.c: interrupt received, but no mail.\n");
 427         /* We detected a reset.  Restart all pending commands for
 428            devices that use the hard reset option */
 429         if(needs_restart) aha1542_restart(shost);
 430         return;
 431       };
 432 
 433       mbo = (scsi2int(mb[mbi].ccbptr) - ((unsigned int) &ccb[0])) / sizeof(struct ccb);
 434       mbistatus = mb[mbi].status;
 435       mb[mbi].status = 0;
 436       HOSTDATA(shost)->aha1542_last_mbi_used = mbi;
 437       restore_flags(flags);
 438       
 439 #ifdef DEBUG
 440       {
 441         if (ccb[mbo].tarstat|ccb[mbo].hastat)
 442           printk("aha1542_command: returning %x (status %d)\n", 
 443                  ccb[mbo].tarstat + ((int) ccb[mbo].hastat << 16), mb[mbi].status);
 444       };
 445 #endif
 446 
 447       if(mbistatus == 3) continue; /* Aborted command not found */
 448 
 449 #ifdef DEBUG
 450       printk("...done %d %d\n",mbo, mbi);
 451 #endif
 452       
 453       SCtmp = HOSTDATA(shost)->SCint[mbo];
 454 
 455       if (!SCtmp || !SCtmp->scsi_done) {
 456         printk("aha1542_intr_handle: Unexpected interrupt\n");
 457         printk("tarstat=%x, hastat=%x idlun=%x ccb#=%d \n", ccb[mbo].tarstat, 
 458                ccb[mbo].hastat, ccb[mbo].idlun, mbo);
 459         return;
 460       }
 461       
 462       my_done = SCtmp->scsi_done;
 463       if (SCtmp->host_scribble) scsi_free(SCtmp->host_scribble, 512);
 464       
 465       /* Fetch the sense data, and tuck it away, in the required slot.  The
 466          Adaptec automatically fetches it, and there is no guarantee that
 467          we will still have it in the cdb when we come back */
 468       if (ccb[mbo].tarstat == 2)
 469         memcpy(SCtmp->sense_buffer, &ccb[mbo].cdb[ccb[mbo].cdblen], 
 470                sizeof(SCtmp->sense_buffer));
 471       
 472       
 473       /* is there mail :-) */
 474       
 475       /* more error checking left out here */
 476       if (mbistatus != 1)
 477         /* This is surely wrong, but I don't know what's right */
 478         errstatus = makecode(ccb[mbo].hastat, ccb[mbo].tarstat);
 479       else
 480         errstatus = 0;
 481       
 482 #ifdef DEBUG
 483       if(errstatus) printk("(aha1542 error:%x %x %x) ",errstatus, 
 484                            ccb[mbo].hastat, ccb[mbo].tarstat);
 485 #endif
 486 
 487       if (ccb[mbo].tarstat == 2) {
 488 #ifdef DEBUG
 489         int i;
 490 #endif
 491         DEB(printk("aha1542_intr_handle: sense:"));
 492 #ifdef DEBUG
 493         for (i = 0; i < 12; i++)
 494           printk("%02x ", ccb[mbo].cdb[ccb[mbo].cdblen+i]);
 495         printk("\n");
 496 #endif
 497         /*
 498           DEB(printk("aha1542_intr_handle: buf:"));
 499           for (i = 0; i < bufflen; i++)
 500           printk("%02x ", ((unchar *)buff)[i]);
 501           printk("\n");
 502           */
 503       }
 504       DEB(if (errstatus) printk("aha1542_intr_handle: returning %6x\n", errstatus));
 505       SCtmp->result = errstatus;
 506       HOSTDATA(shost)->SCint[mbo] = NULL;  /* This effectively frees up the mailbox slot, as
 507                              far as queuecommand is concerned */
 508       my_done(SCtmp);
 509       number_serviced++;
 510     };
 511 }
 512 
 513 int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
     /*  */
 514 {
 515     unchar ahacmd = CMD_START_SCSI;
 516     unchar direction;
 517     unchar *cmd = (unchar *) SCpnt->cmnd;
 518     unchar target = SCpnt->target;
 519     unchar lun = SCpnt->lun;
 520     unsigned long flags;
 521     void *buff = SCpnt->request_buffer;
 522     int bufflen = SCpnt->request_bufflen;
 523     int mbo;
 524     struct mailbox * mb;
 525     struct ccb  *ccb;
 526 
 527     DEB(int i);
 528 
 529     mb = HOSTDATA(SCpnt->host)->mb;
 530     ccb = HOSTDATA(SCpnt->host)->ccb;
 531 
 532     DEB(if (target > 1) {
 533       SCpnt->result = DID_TIME_OUT << 16;
 534       done(SCpnt); return 0;});
 535     
 536     if(*cmd == REQUEST_SENSE){
 537 #ifndef DEBUG
 538       if (bufflen != sizeof(SCpnt->sense_buffer)) {
 539         printk("Wrong buffer length supplied for request sense (%d)\n",bufflen);
 540       };
 541 #endif
 542       SCpnt->result = 0;
 543       done(SCpnt); 
 544       return 0;
 545     };
 546 
 547 #ifdef DEBUG
 548     if (*cmd == READ_10 || *cmd == WRITE_10)
 549       i = xscsi2int(cmd+2);
 550     else if (*cmd == READ_6 || *cmd == WRITE_6)
 551       i = scsi2int(cmd+2);
 552     else
 553       i = -1;
 554     if (done)
 555       printk("aha1542_queuecommand: dev %d cmd %02x pos %d len %d ", target, *cmd, i, bufflen);
 556     else
 557       printk("aha1542_command: dev %d cmd %02x pos %d len %d ", target, *cmd, i, bufflen);
 558     aha1542_stat();
 559     printk("aha1542_queuecommand: dumping scsi cmd:");
 560     for (i = 0; i < SCpnt->cmd_len; i++) printk("%02x ", cmd[i]);
 561     printk("\n");
 562     if (*cmd == WRITE_10 || *cmd == WRITE_6)
 563       return 0; /* we are still testing, so *don't* write */
 564 #endif
 565 /* Use the outgoing mailboxes in a round-robin fashion, because this
 566    is how the host adapter will scan for them */
 567 
 568     save_flags(flags);
 569     cli();
 570     mbo = HOSTDATA(SCpnt->host)->aha1542_last_mbo_used + 1;
 571     if (mbo >= AHA1542_MAILBOXES) mbo = 0;
 572 
 573     do{
 574       if(mb[mbo].status == 0 && HOSTDATA(SCpnt->host)->SCint[mbo] == NULL)
 575         break;
 576       mbo++;
 577       if (mbo >= AHA1542_MAILBOXES) mbo = 0;
 578     } while (mbo != HOSTDATA(SCpnt->host)->aha1542_last_mbo_used);
 579 
 580     if(mb[mbo].status || HOSTDATA(SCpnt->host)->SCint[mbo])
 581       panic("Unable to find empty mailbox for aha1542.\n");
 582 
 583     HOSTDATA(SCpnt->host)->SCint[mbo] = SCpnt;  /* This will effectively prevent someone else from
 584                             screwing with this cdb. */
 585 
 586     HOSTDATA(SCpnt->host)->aha1542_last_mbo_used = mbo;    
 587     restore_flags(flags);
 588 
 589 #ifdef DEBUG
 590     printk("Sending command (%d %x)...",mbo, done);
 591 #endif
 592 
 593     any2scsi(mb[mbo].ccbptr, &ccb[mbo]); /* This gets trashed for some reason*/
 594 
 595     memset(&ccb[mbo], 0, sizeof(struct ccb));
 596 
 597     ccb[mbo].cdblen = SCpnt->cmd_len;
 598 
 599     direction = 0;
 600     if (*cmd == READ_10 || *cmd == READ_6)
 601         direction = 8;
 602     else if (*cmd == WRITE_10 || *cmd == WRITE_6)
 603         direction = 16;
 604 
 605     memcpy(ccb[mbo].cdb, cmd, ccb[mbo].cdblen);
 606 
 607     if (SCpnt->use_sg) {
 608       struct scatterlist * sgpnt;
 609       struct chain * cptr;
 610 #ifdef DEBUG
 611       unsigned char * ptr;
 612 #endif
 613       int i;
 614       ccb[mbo].op = 2;        /* SCSI Initiator Command  w/scatter-gather*/
 615       SCpnt->host_scribble = (unsigned char *) scsi_malloc(512);
 616       sgpnt = (struct scatterlist *) SCpnt->request_buffer;
 617       cptr = (struct chain *) SCpnt->host_scribble; 
 618       if (cptr == NULL) panic("aha1542.c: unable to allocate DMA memory\n");
 619       for(i=0; i<SCpnt->use_sg; i++) {
 620         if(sgpnt[i].length == 0 || SCpnt->use_sg > 16 || 
 621            (((int)sgpnt[i].address) & 1) || (sgpnt[i].length & 1)){
 622           unsigned char * ptr;
 623           printk("Bad segment list supplied to aha1542.c (%d, %d)\n",SCpnt->use_sg,i);
 624           for(i=0;i<SCpnt->use_sg;i++){
 625             printk("%d: %x %x %d\n",i,(unsigned int) sgpnt[i].address, (unsigned int) sgpnt[i].alt_address,
 626                    sgpnt[i].length);
 627           };
 628           printk("cptr %x: ",(unsigned int) cptr);
 629           ptr = (unsigned char *) &cptr[i];
 630           for(i=0;i<18;i++) printk("%02x ", ptr[i]);
 631           panic("Foooooooood fight!");
 632         };
 633         any2scsi(cptr[i].dataptr, sgpnt[i].address);
 634         if(((unsigned  int) sgpnt[i].address) & 0xff000000) goto baddma;
 635         any2scsi(cptr[i].datalen, sgpnt[i].length);
 636       };
 637       any2scsi(ccb[mbo].datalen, SCpnt->use_sg * sizeof(struct chain));
 638       any2scsi(ccb[mbo].dataptr, cptr);
 639 #ifdef DEBUG
 640       printk("cptr %x: ",cptr);
 641       ptr = (unsigned char *) cptr;
 642       for(i=0;i<18;i++) printk("%02x ", ptr[i]);
 643 #endif
 644     } else {
 645       ccb[mbo].op = 0;        /* SCSI Initiator Command */
 646       SCpnt->host_scribble = NULL;
 647       any2scsi(ccb[mbo].datalen, bufflen);
 648       if(((unsigned int) buff & 0xff000000)) goto baddma;
 649       any2scsi(ccb[mbo].dataptr, buff);
 650     };
 651     ccb[mbo].idlun = (target&7)<<5 | direction | (lun & 7); /*SCSI Target Id*/
 652     ccb[mbo].rsalen = 12;
 653     ccb[mbo].linkptr[0] = ccb[mbo].linkptr[1] = ccb[mbo].linkptr[2] = 0;
 654     ccb[mbo].commlinkid = 0;
 655 
 656 #ifdef DEBUG
 657     { int i;
 658     printk("aha1542_command: sending.. ");
 659     for (i = 0; i < sizeof(ccb[mbo])-10; i++)
 660       printk("%02x ", ((unchar *)&ccb[mbo])[i]);
 661     };
 662 #endif
 663     
 664     if (done) {
 665         DEB(printk("aha1542_queuecommand: now waiting for interrupt "); aha1542_stat());
 666         SCpnt->scsi_done = done;
 667         mb[mbo].status = 1;
 668         aha1542_out(SCpnt->host->io_port, &ahacmd, 1);          /* start scsi command */
 669         DEB(aha1542_stat());
 670     }
 671     else
 672       printk("aha1542_queuecommand: done can't be NULL\n");
 673     
 674     return 0;
 675  baddma:
 676     panic("Buffer at address  > 16Mb used for 1542B");
 677 }
 678 
 679 static void internal_done(Scsi_Cmnd * SCpnt)
     /*  */
 680 {
 681         SCpnt->SCp.Status++;
 682 }
 683 
 684 int aha1542_command(Scsi_Cmnd * SCpnt)
     /*  */
 685 {
 686     DEB(printk("aha1542_command: ..calling aha1542_queuecommand\n"));
 687 
 688     aha1542_queuecommand(SCpnt, internal_done);
 689 
 690     SCpnt->SCp.Status = 0;
 691     while (!SCpnt->SCp.Status)
 692         barrier();
 693     return SCpnt->result;
 694 }
 695 
 696 /* Initialize mailboxes */
 697 static void setup_mailboxes(int bse, struct Scsi_Host * shpnt)
     /*  */
 698 {
 699     int i;
 700     struct mailbox * mb;
 701     struct ccb  *ccb;
 702 
 703     unchar cmd[5] = {CMD_MBINIT, AHA1542_MAILBOXES, 0, 0, 0};
 704 
 705     mb = HOSTDATA(shpnt)->mb;
 706     ccb = HOSTDATA(shpnt)->ccb;
 707 
 708     for(i=0; i<AHA1542_MAILBOXES; i++){
 709       mb[i].status = mb[AHA1542_MAILBOXES+i].status = 0;
 710       any2scsi(mb[i].ccbptr, &ccb[i]);
 711     };
 712     aha1542_intr_reset(bse);     /* reset interrupts, so they don't block */    
 713     any2scsi((cmd+2), mb);
 714     aha1542_out(bse, cmd, 5);
 715     WAIT(INTRFLAGS(bse), INTRMASK, HACC, 0);
 716     while (0) {
 717       fail:
 718         printk("aha1542_detect: failed setting up mailboxes\n");
 719     }
 720     aha1542_intr_reset(bse);
 721 }
 722 
 723 static int aha1542_getconfig(int base_io, unsigned char * irq_level, unsigned char * dma_chan, unsigned char * scsi_id)
     /*  */
 724 {
 725   unchar inquiry_cmd[] = {CMD_RETCONF };
 726   unchar inquiry_result[3];
 727   int i;
 728   i = inb(STATUS(base_io));
 729   if (i & DF) {
 730     i = inb(DATA(base_io));
 731   };
 732   aha1542_out(base_io, inquiry_cmd, 1);
 733   aha1542_in(base_io, inquiry_result, 3);
 734   WAIT(INTRFLAGS(base_io), INTRMASK, HACC, 0);
 735   while (0) {
 736   fail:
 737     printk("aha1542_detect: query board settings\n");
 738   }
 739   aha1542_intr_reset(base_io);
 740   switch(inquiry_result[0]){
 741   case 0x80:
 742     *dma_chan = 7;
 743     break;
 744   case 0x40:
 745     *dma_chan = 6;
 746     break;
 747   case 0x20:
 748     *dma_chan = 5;
 749     break;
 750   case 0x01:
 751     printk("DMA priority 0 not available for Adaptec driver\n");
 752     return -1;
 753   case 0:
 754     /* This means that the adapter, although Adaptec 1542 compatible, doesn't use a DMA channel.
 755        Currently only aware of the BusLogic BT-445S VL-Bus adapter which needs this. */
 756     *dma_chan = 0xFF;
 757     break;
 758   default:
 759     printk("Unable to determine Adaptec DMA priority.  Disabling board\n");
 760     return -1;
 761   };
 762   switch(inquiry_result[1]){
 763   case 0x40:
 764     *irq_level = 15;
 765     break;
 766   case 0x20:
 767     *irq_level = 14;
 768     break;
 769   case 0x8:
 770     *irq_level = 12;
 771     break;
 772   case 0x4:
 773     *irq_level = 11;
 774     break;
 775   case 0x2:
 776     *irq_level = 10;
 777     break;
 778   case 0x1:
 779     *irq_level = 9;
 780     break;
 781   default:
 782     printk("Unable to determine Adaptec IRQ level.  Disabling board\n");
 783     return -1;
 784   };
 785   *scsi_id=inquiry_result[2] & 7;
 786   return 0;
 787 }
 788 
 789 /* This function should only be called for 1542C boards - we can detect
 790    the special firmware settings and unlock the board */
 791 
 792 static int aha1542_mbenable(int base)
     /*  */
 793 {
 794   static unchar mbenable_cmd[3];
 795   static unchar mbenable_result[2];
 796   int retval;
 797   
 798   retval = BIOS_TRANSLATION_6432;
 799 
 800   mbenable_cmd[0]=CMD_EXTBIOS;
 801   aha1542_out(base,mbenable_cmd,1);
 802   if(aha1542_in1(base,mbenable_result,2))
 803     return retval;
 804   WAITd(INTRFLAGS(base),INTRMASK,HACC,0,100);
 805   aha1542_intr_reset(base);
 806   
 807   if ((mbenable_result[0] & 0x08) || mbenable_result[1]) {
 808      mbenable_cmd[0]=CMD_MBENABLE;
 809      mbenable_cmd[1]=0;
 810      mbenable_cmd[2]=mbenable_result[1];
 811      if(mbenable_result[1] & 1) retval = BIOS_TRANSLATION_25563;
 812      aha1542_out(base,mbenable_cmd,3);
 813      WAIT(INTRFLAGS(base),INTRMASK,HACC,0);
 814   };
 815   while(0) {
 816 fail:
 817     printk("aha1542_mbenable: Mailbox init failed\n");
 818   }
 819 aha1542_intr_reset(base);
 820 return retval;
 821 }
 822 
 823 /* Query the board to find out if it is a 1542 or a 1740, or whatever. */
 824 static int aha1542_query(int base_io, int * transl)
     /*  */
 825 {
 826   unchar inquiry_cmd[] = {CMD_INQUIRY };
 827   unchar inquiry_result[4];
 828   int i;
 829   i = inb(STATUS(base_io));
 830   if (i & DF) {
 831     i = inb(DATA(base_io));
 832   };
 833   aha1542_out(base_io, inquiry_cmd, 1);
 834   aha1542_in(base_io, inquiry_result, 4);
 835   WAIT(INTRFLAGS(base_io), INTRMASK, HACC, 0);
 836   while (0) {
 837   fail:
 838     printk("aha1542_detect: query card type\n");
 839   }
 840   aha1542_intr_reset(base_io);
 841 
 842   *transl = BIOS_TRANSLATION_6432; /* Default case */
 843 
 844 /* For an AHA1740 series board, we ignore the board since there is a
 845    hardware bug which can lead to wrong blocks being returned if the board
 846    is operating in the 1542 emulation mode.  Since there is an extended mode
 847    driver, we simply ignore the board and let the 1740 driver pick it up.
 848 */
 849 
 850   if (inquiry_result[0] == 0x43) {
 851     printk("aha1542.c: Emulation mode not supported for AHA 174N hardware.\n");
 852     return 1;
 853   };
 854 
 855   /* Always call this - boards that do not support extended bios translation
 856      will ignore the command, and we will set the proper default */
 857 
 858   *transl = aha1542_mbenable(base_io);
 859 
 860   return 0;
 861 }
 862 
 863 /* called from init/main.c */
 864 void aha1542_setup( char *str, int *ints)
     /*  */
 865 {
 866     const char *ahausage = "aha1542: usage: aha1542=<PORTBASE>[,<BUSON>,<BUSOFF>[,<DMASPEED>]]\n";
 867     static int setup_idx = 0;
 868     int setup_portbase;
 869 
 870     if(setup_idx >= MAXBOARDS)
 871       {
 872         printk("aha1542: aha1542_setup called too many times! Bad LILO params ?\n");
 873         printk("   Entryline 1: %s\n",setup_str[0]);
 874         printk("   Entryline 2: %s\n",setup_str[1]);
 875         printk("   This line:   %s\n",str);
 876         return;
 877       }
 878     if (ints[0] < 1 || ints[0] > 4)
 879       {
 880         printk("aha1542: %s\n", str );
 881         printk(ahausage);
 882         printk("aha1542: Wrong parameters may cause system malfunction.. We try anyway..\n");
 883       }
 884 
 885     setup_called[setup_idx]=ints[0];
 886     setup_str[setup_idx]=str;
 887 
 888     setup_portbase             = ints[0] >= 1 ? ints[1] : 0; /* Preserve the default value.. */
 889     setup_buson   [setup_idx]  = ints[0] >= 2 ? ints[2] : 7;
 890     setup_busoff  [setup_idx]  = ints[0] >= 3 ? ints[3] : 5;
 891     if (ints[0] >= 4) {
 892       int atbt = -1;
 893       switch (ints[4]) {
 894         case 5:
 895             atbt = 0x00;
 896             break;
 897         case 6:
 898             atbt = 0x04;
 899             break;
 900         case 7:
 901             atbt = 0x01;
 902             break;
 903         case 8:
 904             atbt = 0x02;
 905             break;
 906         case 10:
 907             atbt = 0x03;
 908             break;
 909         default:
 910             printk("aha1542: %s\n", str );
 911             printk(ahausage);
 912             printk("aha1542: Valid values for DMASPEED are 5-8, 10 MB/s.  Using jumper defaults.\n");
 913             break;
 914       }
 915       setup_dmaspeed[setup_idx]  = atbt;
 916     }
 917 
 918     if (setup_portbase != 0)
 919       bases[setup_idx] = setup_portbase;
 920 
 921     ++setup_idx;
 922 }
 923 
 924 /* return non-zero on detection */
 925 int aha1542_detect(Scsi_Host_Template * tpnt)
     /*  */
 926 {
 927     unsigned char dma_chan;
 928     unsigned char irq_level;
 929     unsigned char scsi_id;
 930     unsigned long flags;
 931     unsigned int base_io;
 932     int trans;
 933     struct Scsi_Host * shpnt = NULL;
 934     int count = 0;
 935     int indx;
 936 
 937     DEB(printk("aha1542_detect: \n"));
 938 
 939     tpnt->proc_dir = &proc_scsi_aha1542;
 940 
 941     for(indx = 0; indx < sizeof(bases)/sizeof(bases[0]); indx++)
 942             if(bases[indx] != 0 && !check_region(bases[indx], 4)) { 
 943                     shpnt = scsi_register(tpnt,
 944                                           sizeof(struct aha1542_hostdata));
 945 
 946                     /* For now we do this - until kmalloc is more intelligent
 947                        we are resigned to stupid hacks like this */
 948                     if ((unsigned int) shpnt > 0xffffff) {
 949                       printk("Invalid address for shpnt with 1542.\n");
 950                       goto unregister;
 951                     }
 952 
 953                     if(!aha1542_test_port(bases[indx], shpnt)) goto unregister;
 954 
 955 
 956                     base_io = bases[indx];
 957                     
 958                     /* Set the Bus on/off-times as not to ruin floppy performance */
 959             {
 960                     unchar oncmd[] = {CMD_BUSON_TIME, 7};
 961                     unchar offcmd[] = {CMD_BUSOFF_TIME, 5};
 962 
 963                     if(setup_called[indx])
 964                       {
 965                         oncmd[1]  = setup_buson[indx];
 966                         offcmd[1] = setup_busoff[indx];
 967                       }
 968                     
 969                     aha1542_intr_reset(base_io);
 970                     aha1542_out(base_io, oncmd, 2);
 971                     WAIT(INTRFLAGS(base_io), INTRMASK, HACC, 0);
 972                     aha1542_intr_reset(base_io);
 973                     aha1542_out(base_io, offcmd, 2);
 974                     WAIT(INTRFLAGS(base_io), INTRMASK, HACC, 0);
 975                     if (setup_dmaspeed[indx] >= 0)
 976                       {
 977                         unchar dmacmd[] = {CMD_DMASPEED, 0};
 978                         dmacmd[1] = setup_dmaspeed[indx];
 979                         aha1542_intr_reset(base_io);
 980                         aha1542_out(base_io, dmacmd, 2);
 981                         WAIT(INTRFLAGS(base_io), INTRMASK, HACC, 0);
 982                       }
 983                     while (0) {
 984                     fail:
 985                             printk("aha1542_detect: setting bus on/off-time failed\n");
 986                     }
 987                     aha1542_intr_reset(base_io);
 988             }
 989                     if(aha1542_query(base_io, &trans))  goto unregister;
 990                     
 991                     if (aha1542_getconfig(base_io, &irq_level, &dma_chan, &scsi_id) == -1)  goto unregister;
 992                     
 993                     printk("Configuring Adaptec (SCSI-ID %d) at IO:%x, IRQ %d", scsi_id, base_io, irq_level);
 994                     if (dma_chan != 0xFF)
 995                             printk(", DMA priority %d", dma_chan);
 996                     printk("\n");
 997                     
 998                     DEB(aha1542_stat());
 999                     setup_mailboxes(base_io, shpnt);
1000                     
1001                     DEB(aha1542_stat());
1002                     
1003                     DEB(printk("aha1542_detect: enable interrupt channel %d\n", irq_level));
1004                     save_flags(flags);
1005                     cli();
1006                     if (request_irq(irq_level,aha1542_intr_handle, 0, "aha1542")) {
1007                             printk("Unable to allocate IRQ for adaptec controller.\n");
1008                             goto unregister;
1009                     }
1010                     
1011                     if (dma_chan != 0xFF) {
1012                             if (request_dma(dma_chan,"aha1542")) {
1013                                     printk("Unable to allocate DMA channel for Adaptec.\n");
1014                                     free_irq(irq_level);
1015                                     goto unregister;
1016                             }
1017                             
1018                             if (dma_chan >= 5) {
1019                                     outb((dma_chan - 4) | CASCADE, DMA_MODE_REG);
1020                                     outb(dma_chan - 4, DMA_MASK_REG);
1021                             }
1022                     }
1023                     aha_host[irq_level - 9] = shpnt;
1024                     shpnt->this_id = scsi_id;
1025                     shpnt->unique_id = base_io;
1026                     shpnt->io_port = base_io;
1027                     shpnt->n_io_port = 4;  /* Number of bytes of I/O space used */
1028                     shpnt->dma_channel = dma_chan;
1029                     shpnt->irq = irq_level;
1030                     HOSTDATA(shpnt)->bios_translation  = trans;
1031                     if(trans == 2) 
1032                       printk("aha1542.c: Using extended bios translation\n");
1033                     HOSTDATA(shpnt)->aha1542_last_mbi_used  = (2*AHA1542_MAILBOXES - 1);
1034                     HOSTDATA(shpnt)->aha1542_last_mbo_used  = (AHA1542_MAILBOXES - 1);
1035                     memset(HOSTDATA(shpnt)->SCint, 0, sizeof(HOSTDATA(shpnt)->SCint));
1036                     restore_flags(flags);
1037 #if 0
1038                     DEB(printk(" *** READ CAPACITY ***\n"));
1039                     
1040             {
1041                     unchar buf[8];
1042                     static unchar cmd[] = {     READ_CAPACITY, 0, 0, 0, 0, 0, 0, 0, 0, 0};
1043                     int i;
1044                     
1045                     for (i = 0; i < sizeof(buf); ++i) buf[i] = 0x87;
1046                     for (i = 0; i < 2; ++i)
1047                             if (!aha1542_command(i, cmd, buf, sizeof(buf))) {
1048                                     printk("aha_detect: LU %d sector_size %d device_size %d\n",
1049                                            i, xscsi2int(buf+4), xscsi2int(buf));
1050                             }
1051             }
1052                     
1053                     DEB(printk(" *** NOW RUNNING MY OWN TEST *** \n"));
1054                     
1055                     for (i = 0; i < 4; ++i)
1056                     {
1057                             unsigned char cmd[10];
1058                             static buffer[512];
1059                             
1060                             cmd[0] = READ_10;
1061                             cmd[1] = 0;
1062                             xany2scsi(cmd+2, i);
1063                             cmd[6] = 0;
1064                             cmd[7] = 0;
1065                             cmd[8] = 1;
1066                             cmd[9] = 0;
1067                             aha1542_command(0, cmd, buffer, 512);
1068                     }
1069 #endif    
1070                     request_region(bases[indx], 4,"aha1542");  /* Register the IO ports that we use */
1071                     count++;
1072                     continue;
1073             unregister:
1074                     scsi_unregister(shpnt);
1075                     continue;
1076                     
1077             };
1078         
1079     return count;
1080 }
1081 
1082 static int aha1542_restart(struct Scsi_Host * shost)
     /*  */
1083 {
1084   int i;
1085   int count = 0;
1086 #if 0
1087   unchar ahacmd = CMD_START_SCSI;
1088 #endif
1089 
1090   for(i=0; i< AHA1542_MAILBOXES; i++)
1091    if(HOSTDATA(shost)->SCint[i] && 
1092       !(HOSTDATA(shost)->SCint[i]->device->soft_reset))
1093      {
1094 #if 0
1095         HOSTDATA(shost)->mb[i].status = 1; /* Indicate ready to restart... */
1096 #endif
1097         count++;
1098      }     
1099 
1100   printk("Potential to restart %d stalled commands...\n", count);
1101 #if 0
1102   /* start scsi command */
1103   if (count) aha1542_out(shost->io_port, &ahacmd, 1);
1104 #endif
1105   return 0;
1106 }
1107 
1108 /* The abort command does not leave the device in a clean state where
1109    it is available to be used again.  Until this gets worked out, we will
1110    leave it commented out.  */
1111 
1112 int aha1542_abort(Scsi_Cmnd * SCpnt)
     /*  */
1113 {
1114 #if 0
1115   unchar ahacmd = CMD_START_SCSI;
1116   unsigned long flags;
1117   struct mailbox * mb;
1118   int mbi, mbo, i;
1119 
1120   printk("In aha1542_abort: %x %x\n",
1121          inb(STATUS(SCpnt->host->io_port)),
1122          inb(INTRFLAGS(SCpnt->host->io_port)));
1123 
1124   save_flags(flags);
1125   cli();
1126   mb = HOSTDATA(SCpnt->host)->mb;
1127   mbi = HOSTDATA(SCpnt->host)->aha1542_last_mbi_used + 1;
1128   if (mbi >= 2*AHA1542_MAILBOXES) mbi = AHA1542_MAILBOXES;
1129   
1130   do{
1131     if(mb[mbi].status != 0) break;
1132     mbi++;
1133     if (mbi >= 2*AHA1542_MAILBOXES) mbi = AHA1542_MAILBOXES;
1134   } while (mbi != HOSTDATA(SCpnt->host)->aha1542_last_mbi_used);
1135   restore_flags(flags);
1136 
1137   if(mb[mbi].status) {
1138     printk("Lost interrupt discovered on irq %d - attempting to recover\n", 
1139            SCpnt->host->irq);
1140     aha1542_intr_handle(SCpnt->host->irq, NULL);
1141     return 0;
1142   }
1143 
1144   /* OK, no lost interrupt.  Try looking to see how many pending commands
1145      we think we have. */
1146 
1147   for(i=0; i< AHA1542_MAILBOXES; i++)
1148    if(HOSTDATA(SCpnt->host)->SCint[i])
1149      {
1150        if(HOSTDATA(SCpnt->host)->SCint[i] == SCpnt) {
1151          printk("Timed out command pending for %s\n",
1152                 kdevname(SCpnt->request.rq_dev));
1153          if (HOSTDATA(SCpnt->host)->mb[i].status) {
1154            printk("OGMB still full - restarting\n");
1155            aha1542_out(SCpnt->host->io_port, &ahacmd, 1);
1156          };
1157        } else
1158          printk("Other pending command %s\n",
1159                 kdevname(SCpnt->request.rq_dev));
1160      }
1161 
1162 #endif
1163 
1164     DEB(printk("aha1542_abort\n"));
1165 #if 0
1166     save_flags(flags);
1167     cli();
1168     for(mbo = 0; mbo < AHA1542_MAILBOXES; mbo++)
1169       if (SCpnt == HOSTDATA(SCpnt->host)->SCint[mbo]){
1170         mb[mbo].status = 2;  /* Abort command */
1171         aha1542_out(SCpnt->host->io_port, &ahacmd, 1); /* start scsi command */
1172         restore_flags(flags);
1173         break;
1174       };
1175 #endif
1176     return SCSI_ABORT_SNOOZE;
1177 }
1178 
1179 /* We do not implement a reset function here, but the upper level code
1180    assumes that it will get some kind of response for the command in
1181    SCpnt.  We must oblige, or the command will hang the scsi system.
1182    For a first go, we assume that the 1542 notifies us with all of the
1183    pending commands (it does implement soft reset, after all). */
1184 
1185 int aha1542_reset(Scsi_Cmnd * SCpnt)
     /*  */
1186 {
1187     unchar ahacmd = CMD_START_SCSI;
1188     int i;
1189 
1190     /*
1191      * See if a bus reset was suggested.
1192      */
1193     if( SCpnt->host->suggest_bus_reset )
1194       {
1195         /* 
1196          * This does a scsi reset for all devices on the bus.
1197          * In principle, we could also reset the 1542 - should
1198          * we do this?  Try this first, and we can add that later
1199          * if it turns out to be useful.
1200          */
1201         outb(SCRST, CONTROL(SCpnt->host->io_port));
1202         /*
1203          * Now try and pick up the pieces.  Restart all commands
1204          * that are currently active on the bus, and reset all of
1205          * the datastructures.  We have some time to kill while
1206          * things settle down, so print a nice message.
1207          */
1208         printk("Sent BUS RESET to scsi host %d\n", SCpnt->host->host_no);
1209 
1210         for(i=0; i< AHA1542_MAILBOXES; i++)
1211           if(HOSTDATA(SCpnt->host)->SCint[i] != NULL)
1212             {
1213               Scsi_Cmnd * SCtmp;
1214               SCtmp = HOSTDATA(SCpnt->host)->SCint[i];
1215               SCtmp->result = DID_RESET << 16;
1216               if (SCtmp->host_scribble) scsi_free(SCtmp->host_scribble, 512);
1217               printk("Sending DID_RESET for target %d\n", SCpnt->target);
1218               SCtmp->scsi_done(SCpnt);
1219               
1220               HOSTDATA(SCpnt->host)->SCint[i] = NULL;
1221               HOSTDATA(SCpnt->host)->mb[i].status = 0;
1222             }
1223         /*
1224          * Now tell the mid-level code what we did here.  Since
1225          * we have restarted all of the outstanding commands,
1226          * then report SUCCESS.
1227          */
1228         return (SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET);
1229       }
1230     else
1231       {
1232         /* This does a selective reset of just the one device */
1233         /* First locate the ccb for this command */
1234         for(i=0; i< AHA1542_MAILBOXES; i++)
1235           if(HOSTDATA(SCpnt->host)->SCint[i] == SCpnt)
1236             {
1237               HOSTDATA(SCpnt->host)->ccb[i].op = 0x81;  /* BUS DEVICE RESET */
1238               /* Now tell the 1542 to flush all pending commands for this target */
1239               aha1542_out(SCpnt->host->io_port, &ahacmd, 1);
1240               
1241               /* Here is the tricky part.  What to do next.  Do we get an interrupt
1242                  for the commands that we aborted with the specified target, or
1243                  do we generate this on our own?  Try it without first and see
1244                  what happens */
1245               printk("Sent BUS DEVICE RESET to target %d\n", SCpnt->target);
1246               
1247               /* If the first does not work, then try the second.  I think the
1248                  first option is more likely to be correct. Free the command
1249                  block for all commands running on this target... */
1250               for(i=0; i< AHA1542_MAILBOXES; i++)
1251                 if(HOSTDATA(SCpnt->host)->SCint[i] &&
1252                    HOSTDATA(SCpnt->host)->SCint[i]->target == SCpnt->target)
1253                   {
1254                     Scsi_Cmnd * SCtmp;
1255                     SCtmp = HOSTDATA(SCpnt->host)->SCint[i];
1256                     SCtmp->result = DID_RESET << 16;
1257                     if (SCtmp->host_scribble) scsi_free(SCtmp->host_scribble, 512);
1258                     printk("Sending DID_RESET for target %d\n", SCpnt->target);
1259                     SCtmp->scsi_done(SCpnt);
1260                     
1261                     HOSTDATA(SCpnt->host)->SCint[i] = NULL;
1262                     HOSTDATA(SCpnt->host)->mb[i].status = 0;
1263                   }
1264               return SCSI_RESET_SUCCESS;
1265             }
1266       }
1267     /* No active command at this time, so this means that each time we got
1268        some kind of response the last time through.  Tell the mid-level code
1269        to request sense information in order to decide what to do next. */
1270     return SCSI_RESET_PUNT;
1271 }
1272 
1273 #include "sd.h"
1274 
1275 int aha1542_biosparam(Scsi_Disk * disk, kdev_t dev, int * ip)
     /*  */
1276 {
1277   int translation_algorithm;
1278   int size = disk->capacity;
1279 
1280   translation_algorithm = HOSTDATA(disk->device->host)->bios_translation;
1281   /* Should this be > 1024, or >= 1024?  Enquiring minds want to know. */
1282   if((size>>11) > 1024 && translation_algorithm == 2) {
1283     /* Please verify that this is the same as what DOS returns */
1284     ip[0] = 255;
1285     ip[1] = 63;
1286     ip[2] = size /255/63;
1287   } else {
1288     ip[0] = 64;
1289     ip[1] = 32;
1290     ip[2] = size >> 11;
1291   };
1292 /*  if (ip[2] >= 1024) ip[2] = 1024; */
1293   return 0;
1294 }
1295 
1296 
1297 #ifdef MODULE
1298 /* Eventually this will go into an include file, but this will be later */
1299 Scsi_Host_Template driver_template = AHA1542;
1300 
1301 #include "scsi_module.c"
1302 #endif
1303
/* */
root/drivers/scsi/aha1542.c

DEFINITIONS
