drivers/scsi/aha1740.c

   1 /*  $Id$
   2  *  1993/03/31
   3  *  linux/kernel/aha1740.c
   4  *
   5  *  Based loosely on aha1542.c which is
   6  *  Copyright (C) 1992  Tommy Thorn and
   7  *  Modified by Eric Youngdale
   8  *
   9  *  This file is aha1740.c, written and
  10  *  Copyright (C) 1992,1993  Brad McLean
  11  *  brad@saturn.gaylord.com or brad@bradpc.gaylord.com.
  12  *
  13  *  Modifications to makecode and queuecommand
  14  *  for proper handling of multiple devices courteously
  15  *  provided by Michael Weller, March, 1993
  16  *
  17  *  Multiple adapter support, extended translation detection,
  18  *  update to current scsi subsystem changes, proc fs support,
  19  *  working (!) module support based on patches from Andreas Arens,
  20  *  by Andreas Degert <ad@papyrus.hamburg.com>, 2/1997
  21  *
  22  * aha1740_makecode may still need even more work
  23  * if it doesn't work for your devices, take a look.
  24  *
  25  * Reworked for new_eh and new locking by Alan Cox <alan@lxorguk.ukuu.org.uk>
  26  *
  27  * Converted to EISA and generic DMA APIs by Marc Zyngier
  28  * <maz@wild-wind.fr.eu.org>, 4/2003.
  29  *
  30  * Shared interrupt support added by Rask Ingemann Lambertsen
  31  * <rask@sygehus.dk>, 10/2003
  32  *
  33  * For the avoidance of doubt the "preferred form" of this code is one which
  34  * is in an open non patent encumbered format. Where cryptographic key signing
  35  * forms part of the process of creating an executable the information
  36  * including keys needed to generate an equivalently functional executable
  37  * are deemed to be part of the source code.
  38  */
  39
  40 #include <linux/blkdev.h>
  41 #include <linux/interrupt.h>
  42 #include <linux/module.h>
  43 #include <linux/kernel.h>
  44 #include <linux/types.h>
  45 #include <linux/string.h>
  46 #include <linux/ioport.h>
  47 #include <linux/proc_fs.h>
  48 #include <linux/stat.h>
  49 #include <linux/init.h>
  50 #include <linux/device.h>
  51 #include <linux/eisa.h>
  52 #include <linux/dma-mapping.h>
  53 #include <linux/gfp.h>
  54
  55 #include <asm/dma.h>
  56 #include <asm/io.h>
  57
  58 #include "scsi.h"
  59 #include <scsi/scsi_host.h>
  60 #include "aha1740.h"
  61
  62 /* IF YOU ARE HAVING PROBLEMS WITH THIS DRIVER, AND WANT TO WATCH
  63    IT WORK, THEN:
  64 #define DEBUG
  65 */
  66 #ifdef DEBUG
  67 #define DEB(x) x
  68 #else
  69 #define DEB(x)
  70 #endif
  71
  72 struct aha1740_hostdata {
  73         struct eisa_device *edev;
  74         unsigned int translation;
  75         unsigned int last_ecb_used;
  76         dma_addr_t ecb_dma_addr;
  77         struct ecb ecb[AHA1740_ECBS];
  78 };
  79
  80 struct aha1740_sg {
  81         struct aha1740_chain sg_chain[AHA1740_SCATTER];
  82         dma_addr_t sg_dma_addr;
  83         dma_addr_t buf_dma_addr;
  84 };
  85
  86 #define HOSTDATA(host) ((struct aha1740_hostdata *) &host->hostdata)
  87
  88 static inline struct ecb *ecb_dma_to_cpu (struct Scsi_Host *host,
  89                                           dma_addr_t dma)
  90 {
  91         struct aha1740_hostdata *hdata = HOSTDATA (host);
  92         dma_addr_t offset;
  93
  94         offset = dma - hdata->ecb_dma_addr;
  95
  96         return (struct ecb *)(((char *) hdata->ecb) + (unsigned int) offset);
  97 }
  98
  99 static inline dma_addr_t ecb_cpu_to_dma (struct Scsi_Host *host, void *cpu)
 100 {
 101         struct aha1740_hostdata *hdata = HOSTDATA (host);
 102         dma_addr_t offset;
 103
 104         offset = (char *) cpu - (char *) hdata->ecb;
 105
 106         return hdata->ecb_dma_addr + offset;
 107 }
 108
 109 static int aha1740_show_info(struct seq_file *m, struct Scsi_Host *shpnt)
 110 {
 111         struct aha1740_hostdata *host = HOSTDATA(shpnt);
 112         seq_printf(m, "aha174x at IO:%lx, IRQ %d, SLOT %d.\n"
 113                       "Extended translation %sabled.\n",
 114                       shpnt->io_port, shpnt->irq, host->edev->slot,
 115                       host->translation ? "en" : "dis");
 116         return 0;
 117 }
 118
 119 static int aha1740_makecode(unchar *sense, unchar *status)
 120 {
 121         struct statusword
 122         {
 123                 ushort  don:1,  /* Command Done - No Error */
 124                         du:1,   /* Data underrun */
 125                     :1, qf:1,   /* Queue full */
 126                         sc:1,   /* Specification Check */
 127                         dor:1,  /* Data overrun */
 128                         ch:1,   /* Chaining Halted */
 129                         intr:1, /* Interrupt issued */
 130                         asa:1,  /* Additional Status Available */
 131                         sns:1,  /* Sense information Stored */
 132                     :1, ini:1,  /* Initialization Required */
 133                         me:1,   /* Major error or exception */
 134                     :1, eca:1,  /* Extended Contingent alliance */
 135                     :1;
 136         } status_word;
 137         int retval = DID_OK;
 138
 139         status_word = * (struct statusword *) status;
 140 #ifdef DEBUG
 141         printk("makecode from %x,%x,%x,%x %x,%x,%x,%x",
 142                status[0], status[1], status[2], status[3],
 143                sense[0], sense[1], sense[2], sense[3]);
 144 #endif
 145         if (!status_word.don) { /* Anything abnormal was detected */
 146                 if ( (status[1]&0x18) || status_word.sc ) {
 147                         /*Additional info available*/
 148                         /* Use the supplied info for further diagnostics */
 149                         switch ( status[2] ) {
 150                         case 0x12:
 151                                 if ( status_word.dor )
 152                                         retval=DID_ERROR; /* It's an Overrun */
 153                                 /* If not overrun, assume underrun and
 154                                  * ignore it! */
 155                         case 0x00: /* No info, assume no error, should
 156                                     * not occur */
 157                                 break;
 158                         case 0x11:
 159                         case 0x21:
 160                                 retval=DID_TIME_OUT;
 161                                 break;
 162                         case 0x0a:
 163                                 retval=DID_BAD_TARGET;
 164                                 break;
 165                         case 0x04:
 166                         case 0x05:
 167                                 retval=DID_ABORT;
 168                                 /* Either by this driver or the
 169                                  * AHA1740 itself */
 170                                 break;
 171                         default:
 172                                 retval=DID_ERROR; /* No further
 173                                                    * diagnostics
 174                                                    * possible */
 175                         }
 176                 } else {
 177                         /* Michael suggests, and Brad concurs: */
 178                         if ( status_word.qf ) {
 179                                 retval = DID_TIME_OUT; /* forces a redo */
 180                                 /* I think this specific one should
 181                                  * not happen -Brad */
 182                                 printk("aha1740.c: WARNING: AHA1740 queue overflow!\n");
 183                         } else
 184                                 if ( status[0]&0x60 ) {
 185                                          /* Didn't find a better error */
 186                                         retval = DID_ERROR;
 187                                 }
 188                         /* In any other case return DID_OK so for example
 189                            CONDITION_CHECKS make it through to the appropriate
 190                            device driver */
 191                 }
 192         }
 193         /* Under all circumstances supply the target status -Michael */
 194         return status[3] | retval << 16;
 195 }
 196
 197 static int aha1740_test_port(unsigned int base)
 198 {
 199         if ( inb(PORTADR(base)) & PORTADDR_ENH )
 200                 return 1;   /* Okay, we're all set */
 201
 202         printk("aha174x: Board detected, but not in enhanced mode, so disabled it.\n");
 203         return 0;
 204 }
 205
 206 /* A "high" level interrupt handler */
 207 static irqreturn_t aha1740_intr_handle(int irq, void *dev_id)
 208 {
 209         struct Scsi_Host *host = (struct Scsi_Host *) dev_id;
 210         void (*my_done)(struct scsi_cmnd *);
 211         int errstatus, adapstat;
 212         int number_serviced;
 213         struct ecb *ecbptr;
 214         struct scsi_cmnd *SCtmp;
 215         unsigned int base;
 216         unsigned long flags;
 217         int handled = 0;
 218         struct aha1740_sg *sgptr;
 219         struct eisa_device *edev;
 220
 221         if (!host)
 222                 panic("aha1740.c: Irq from unknown host!\n");
 223         spin_lock_irqsave(host->host_lock, flags);
 224         base = host->io_port;
 225         number_serviced = 0;
 226         edev = HOSTDATA(host)->edev;
 227
 228         while(inb(G2STAT(base)) & G2STAT_INTPEND) {
 229                 handled = 1;
 230                 DEB(printk("aha1740_intr top of loop.\n"));
 231                 adapstat = inb(G2INTST(base));
 232                 ecbptr = ecb_dma_to_cpu (host, inl(MBOXIN0(base)));
 233                 outb(G2CNTRL_IRST,G2CNTRL(base)); /* interrupt reset */
 234
 235                 switch ( adapstat & G2INTST_MASK ) {
 236                 case    G2INTST_CCBRETRY:
 237                 case    G2INTST_CCBERROR:
 238                 case    G2INTST_CCBGOOD:
 239                         /* Host Ready -> Mailbox in complete */
 240                         outb(G2CNTRL_HRDY,G2CNTRL(base));
 241                         if (!ecbptr) {
 242                                 printk("Aha1740 null ecbptr in interrupt (%x,%x,%x,%d)\n",
 243                                        inb(G2STAT(base)),adapstat,
 244                                        inb(G2INTST(base)), number_serviced++);
 245                                 continue;
 246                         }
 247                         SCtmp = ecbptr->SCpnt;
 248                         if (!SCtmp) {
 249                                 printk("Aha1740 null SCtmp in interrupt (%x,%x,%x,%d)\n",
 250                                        inb(G2STAT(base)),adapstat,
 251                                        inb(G2INTST(base)), number_serviced++);
 252                                 continue;
 253                         }
 254                         sgptr = (struct aha1740_sg *) SCtmp->host_scribble;
 255                         scsi_dma_unmap(SCtmp);
 256
 257                         /* Free the sg block */
 258                         dma_free_coherent (&edev->dev,
 259                                            sizeof (struct aha1740_sg),
 260                                            SCtmp->host_scribble,
 261                                            sgptr->sg_dma_addr);
 262
 263                         /* Fetch the sense data, and tuck it away, in
 264                            the required slot.  The Adaptec
 265                            automatically fetches it, and there is no
 266                            guarantee that we will still have it in the
 267                            cdb when we come back */
 268                         if ( (adapstat & G2INTST_MASK) == G2INTST_CCBERROR ) {
 269                                 memcpy(SCtmp->sense_buffer, ecbptr->sense,
 270                                        SCSI_SENSE_BUFFERSIZE);
 271                                 errstatus = aha1740_makecode(ecbptr->sense,ecbptr->status);
 272                         } else
 273                                 errstatus = 0;
 274                         DEB(if (errstatus)
 275                             printk("aha1740_intr_handle: returning %6x\n",
 276                                    errstatus));
 277                         SCtmp->result = errstatus;
 278                         my_done = ecbptr->done;
 279                         memset(ecbptr,0,sizeof(struct ecb));
 280                         if ( my_done )
 281                                 my_done(SCtmp);
 282                         break;
 283
 284                 case    G2INTST_HARDFAIL:
 285                         printk(KERN_ALERT "aha1740 hardware failure!\n");
 286                         panic("aha1740.c");     /* Goodbye */
 287
 288                 case    G2INTST_ASNEVENT:
 289                         printk("aha1740 asynchronous event: %02x %02x %02x %02x %02x\n",
 290                                adapstat,
 291                                inb(MBOXIN0(base)),
 292                                inb(MBOXIN1(base)),
 293                                inb(MBOXIN2(base)),
 294                                inb(MBOXIN3(base))); /* Say What? */
 295                         /* Host Ready -> Mailbox in complete */
 296                         outb(G2CNTRL_HRDY,G2CNTRL(base));
 297                         break;
 298
 299                 case    G2INTST_CMDGOOD:
 300                         /* set immediate command success flag here: */
 301                         break;
 302
 303                 case    G2INTST_CMDERROR:
 304                         /* Set immediate command failure flag here: */
 305                         break;
 306                 }
 307                 number_serviced++;
 308         }
 309
 310         spin_unlock_irqrestore(host->host_lock, flags);
 311         return IRQ_RETVAL(handled);
 312 }
 313
 314 static int aha1740_queuecommand_lck(struct scsi_cmnd * SCpnt,
 315                                     void (*done)(struct scsi_cmnd *))
 316 {
 317         unchar direction;
 318         unchar *cmd = (unchar *) SCpnt->cmnd;
 319         unchar target = scmd_id(SCpnt);
 320         struct aha1740_hostdata *host = HOSTDATA(SCpnt->device->host);
 321         unsigned long flags;
 322         dma_addr_t sg_dma;
 323         struct aha1740_sg *sgptr;
 324         int ecbno, nseg;
 325         DEB(int i);
 326
 327         if(*cmd == REQUEST_SENSE) {
 328                 SCpnt->result = 0;
 329                 done(SCpnt);
 330                 return 0;
 331         }
 332
 333 #ifdef DEBUG
 334         if (*cmd == READ_10 || *cmd == WRITE_10)
 335                 i = xscsi2int(cmd+2);
 336         else if (*cmd == READ_6 || *cmd == WRITE_6)
 337                 i = scsi2int(cmd+2);
 338         else
 339                 i = -1;
 340         printk("aha1740_queuecommand: dev %d cmd %02x pos %d len %d ",
 341                target, *cmd, i, bufflen);
 342         printk("scsi cmd:");
 343         for (i = 0; i < SCpnt->cmd_len; i++) printk("%02x ", cmd[i]);
 344         printk("\n");
 345 #endif
 346
 347         /* locate an available ecb */
 348         spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
 349         ecbno = host->last_ecb_used + 1; /* An optimization */
 350         if (ecbno >= AHA1740_ECBS)
 351                 ecbno = 0;
 352         do {
 353                 if (!host->ecb[ecbno].cmdw)
 354                         break;
 355                 ecbno++;
 356                 if (ecbno >= AHA1740_ECBS)
 357                         ecbno = 0;
 358         } while (ecbno != host->last_ecb_used);
 359
 360         if (host->ecb[ecbno].cmdw)
 361                 panic("Unable to find empty ecb for aha1740.\n");
 362
 363         host->ecb[ecbno].cmdw = AHA1740CMD_INIT; /* SCSI Initiator Command
 364                                                     doubles as reserved flag */
 365
 366         host->last_ecb_used = ecbno;
 367         spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
 368
 369 #ifdef DEBUG
 370         printk("Sending command (%d %x)...", ecbno, done);
 371 #endif
 372
 373         host->ecb[ecbno].cdblen = SCpnt->cmd_len; /* SCSI Command
 374                                                    * Descriptor Block
 375                                                    * Length */
 376
 377         direction = 0;
 378         if (*cmd == READ_10 || *cmd == READ_6)
 379                 direction = 1;
 380         else if (*cmd == WRITE_10 || *cmd == WRITE_6)
 381                 direction = 0;
 382
 383         memcpy(host->ecb[ecbno].cdb, cmd, SCpnt->cmd_len);
 384
 385         SCpnt->host_scribble = dma_alloc_coherent (&host->edev->dev,
 386                                                    sizeof (struct aha1740_sg),
 387                                                    &sg_dma, GFP_ATOMIC);
 388         if(SCpnt->host_scribble == NULL) {
 389                 printk(KERN_WARNING "aha1740: out of memory in queuecommand!\n");
 390                 return 1;
 391         }
 392         sgptr = (struct aha1740_sg *) SCpnt->host_scribble;
 393         sgptr->sg_dma_addr = sg_dma;
 394
 395         nseg = scsi_dma_map(SCpnt);
 396         BUG_ON(nseg < 0);
 397         if (nseg) {
 398                 struct scatterlist *sg;
 399                 struct aha1740_chain * cptr;
 400                 int i;
 401                 DEB(unsigned char * ptr);
 402
 403                 host->ecb[ecbno].sg = 1;  /* SCSI Initiator Command
 404                                            * w/scatter-gather*/
 405                 cptr = sgptr->sg_chain;
 406                 scsi_for_each_sg(SCpnt, sg, nseg, i) {
 407                         cptr[i].datalen = sg_dma_len (sg);
 408                         cptr[i].dataptr = sg_dma_address (sg);
 409                 }
 410                 host->ecb[ecbno].datalen = nseg * sizeof(struct aha1740_chain);
 411                 host->ecb[ecbno].dataptr = sg_dma;
 412 #ifdef DEBUG
 413                 printk("cptr %x: ",cptr);
 414                 ptr = (unsigned char *) cptr;
 415                 for(i=0;i<24;i++) printk("%02x ", ptr[i]);
 416 #endif
 417         } else {
 418                 host->ecb[ecbno].datalen = 0;
 419                 host->ecb[ecbno].dataptr = 0;
 420         }
 421         host->ecb[ecbno].lun = SCpnt->device->lun;
 422         host->ecb[ecbno].ses = 1; /* Suppress underrun errors */
 423         host->ecb[ecbno].dir = direction;
 424         host->ecb[ecbno].ars = 1; /* Yes, get the sense on an error */
 425         host->ecb[ecbno].senselen = 12;
 426         host->ecb[ecbno].senseptr = ecb_cpu_to_dma (SCpnt->device->host,
 427                                                     host->ecb[ecbno].sense);
 428         host->ecb[ecbno].statusptr = ecb_cpu_to_dma (SCpnt->device->host,
 429                                                      host->ecb[ecbno].status);
 430         host->ecb[ecbno].done = done;
 431         host->ecb[ecbno].SCpnt = SCpnt;
 432 #ifdef DEBUG
 433         {
 434                 int i;
 435                 printk("aha1740_command: sending.. ");
 436                 for (i = 0; i < sizeof(host->ecb[ecbno]) - 10; i++)
 437                         printk("%02x ", ((unchar *)&host->ecb[ecbno])[i]);
 438         }
 439         printk("\n");
 440 #endif
 441         if (done) {
 442         /* The Adaptec Spec says the card is so fast that the loops
 443            will only be executed once in the code below. Even if this
 444            was true with the fastest processors when the spec was
 445            written, it doesn't seem to be true with today's fast
 446            processors. We print a warning if the code is executed more
 447            often than LOOPCNT_WARN. If this happens, it should be
 448            investigated. If the count reaches LOOPCNT_MAX, we assume
 449            something is broken; since there is no way to return an
 450            error (the return value is ignored by the mid-level scsi
 451            layer) we have to panic (and maybe that's the best thing we
 452            can do then anyhow). */
 453
 454 #define LOOPCNT_WARN 10         /* excessive mbxout wait -> syslog-msg */
 455 #define LOOPCNT_MAX 1000000     /* mbxout deadlock -> panic() after ~ 2 sec. */
 456                 int loopcnt;
 457                 unsigned int base = SCpnt->device->host->io_port;
 458                 DEB(printk("aha1740[%d] critical section\n",ecbno));
 459
 460                 spin_lock_irqsave(SCpnt->device->host->host_lock, flags);
 461                 for (loopcnt = 0; ; loopcnt++) {
 462                         if (inb(G2STAT(base)) & G2STAT_MBXOUT) break;
 463                         if (loopcnt == LOOPCNT_WARN) {
 464                                 printk("aha1740[%d]_mbxout wait!\n",ecbno);
 465                         }
 466                         if (loopcnt == LOOPCNT_MAX)
 467                                 panic("aha1740.c: mbxout busy!\n");
 468                 }
 469                 outl (ecb_cpu_to_dma (SCpnt->device->host, host->ecb + ecbno),
 470                       MBOXOUT0(base));
 471                 for (loopcnt = 0; ; loopcnt++) {
 472                         if (! (inb(G2STAT(base)) & G2STAT_BUSY)) break;
 473                         if (loopcnt == LOOPCNT_WARN) {
 474                                 printk("aha1740[%d]_attn wait!\n",ecbno);
 475                         }
 476                         if (loopcnt == LOOPCNT_MAX)
 477                                 panic("aha1740.c: attn wait failed!\n");
 478                 }
 479                 outb(ATTN_START | (target & 7), ATTN(base)); /* Start it up */
 480                 spin_unlock_irqrestore(SCpnt->device->host->host_lock, flags);
 481                 DEB(printk("aha1740[%d] request queued.\n",ecbno));
 482         } else
 483                 printk(KERN_ALERT "aha1740_queuecommand: done can't be NULL\n");
 484         return 0;
 485 }
 486
 487 static DEF_SCSI_QCMD(aha1740_queuecommand)
 488
 489 /* Query the board for its irq_level and irq_type.  Nothing else matters
 490    in enhanced mode on an EISA bus. */
 491
 492 static void aha1740_getconfig(unsigned int base, unsigned int *irq_level,
 493                               unsigned int *irq_type,
 494                               unsigned int *translation)
 495 {
 496         static int intab[] = { 9, 10, 11, 12, 0, 14, 15, 0 };
 497
 498         *irq_level = intab[inb(INTDEF(base)) & 0x7];
 499         *irq_type  = (inb(INTDEF(base)) & 0x8) >> 3;
 500         *translation = inb(RESV1(base)) & 0x1;
 501         outb(inb(INTDEF(base)) | 0x10, INTDEF(base));
 502 }
 503
 504 static int aha1740_biosparam(struct scsi_device *sdev,
 505                              struct block_device *dev,
 506                              sector_t capacity, int* ip)
 507 {
 508         int size = capacity;
 509         int extended = HOSTDATA(sdev->host)->translation;
 510
 511         DEB(printk("aha1740_biosparam\n"));
 512         if (extended && (ip[2] > 1024)) {
 513                 ip[0] = 255;
 514                 ip[1] = 63;
 515                 ip[2] = size / (255 * 63);
 516         } else {
 517                 ip[0] = 64;
 518                 ip[1] = 32;
 519                 ip[2] = size >> 11;
 520         }
 521         return 0;
 522 }
 523
 524 static int aha1740_eh_abort_handler (struct scsi_cmnd *dummy)
 525 {
 526 /*
 527  * From Alan Cox :
 528  * The AHA1740 has firmware handled abort/reset handling. The "head in
 529  * sand" kernel code is correct for once 8)
 530  *
 531  * So we define a dummy handler just to keep the kernel SCSI code as
 532  * quiet as possible...
 533  */
 534
 535         return SUCCESS;
 536 }
 537
 538 static struct scsi_host_template aha1740_template = {
 539         .module           = THIS_MODULE,
 540         .proc_name        = "aha1740",
 541         .show_info        = aha1740_show_info,
 542         .name             = "Adaptec 174x (EISA)",
 543         .queuecommand     = aha1740_queuecommand,
 544         .bios_param       = aha1740_biosparam,
 545         .can_queue        = AHA1740_ECBS,
 546         .this_id          = 7,
 547         .sg_tablesize     = AHA1740_SCATTER,
 548         .use_clustering   = ENABLE_CLUSTERING,
 549         .eh_abort_handler = aha1740_eh_abort_handler,
 550 };
 551
 552 static int aha1740_probe (struct device *dev)
 553 {
 554         int slotbase, rc;
 555         unsigned int irq_level, irq_type, translation;
 556         struct Scsi_Host *shpnt;
 557         struct aha1740_hostdata *host;
 558         struct eisa_device *edev = to_eisa_device (dev);
 559
 560         DEB(printk("aha1740_probe: \n"));
 561
 562         slotbase = edev->base_addr + EISA_VENDOR_ID_OFFSET;
 563         if (!request_region(slotbase, SLOTSIZE, "aha1740")) /* See if in use */
 564                 return -EBUSY;
 565         if (!aha1740_test_port(slotbase))
 566                 goto err_release_region;
 567         aha1740_getconfig(slotbase,&irq_level,&irq_type,&translation);
 568         if ((inb(G2STAT(slotbase)) &
 569              (G2STAT_MBXOUT|G2STAT_BUSY)) != G2STAT_MBXOUT) {
 570                 /* If the card isn't ready, hard reset it */
 571                 outb(G2CNTRL_HRST, G2CNTRL(slotbase));
 572                 outb(0, G2CNTRL(slotbase));
 573         }
 574         printk(KERN_INFO "Configuring slot %d at IO:%x, IRQ %u (%s)\n",
 575                edev->slot, slotbase, irq_level, irq_type ? "edge" : "level");
 576         printk(KERN_INFO "aha174x: Extended translation %sabled.\n",
 577                translation ? "en" : "dis");
 578         shpnt = scsi_host_alloc(&aha1740_template,
 579                               sizeof(struct aha1740_hostdata));
 580         if(shpnt == NULL)
 581                 goto err_release_region;
 582
 583         shpnt->base = 0;
 584         shpnt->io_port = slotbase;
 585         shpnt->n_io_port = SLOTSIZE;
 586         shpnt->irq = irq_level;
 587         shpnt->dma_channel = 0xff;
 588         host = HOSTDATA(shpnt);
 589         host->edev = edev;
 590         host->translation = translation;
 591         host->ecb_dma_addr = dma_map_single (&edev->dev, host->ecb,
 592                                              sizeof (host->ecb),
 593                                              DMA_BIDIRECTIONAL);
 594         if (!host->ecb_dma_addr) {
 595                 printk (KERN_ERR "aha1740_probe: Couldn't map ECB, giving up\n");
 596                 scsi_host_put (shpnt);
 597                 goto err_host_put;
 598         }
 599
 600         DEB(printk("aha1740_probe: enable interrupt channel %d\n",irq_level));
 601         if (request_irq(irq_level,aha1740_intr_handle,irq_type ? 0 : IRQF_SHARED,
 602                         "aha1740",shpnt)) {
 603                 printk(KERN_ERR "aha1740_probe: Unable to allocate IRQ %d.\n",
 604                        irq_level);
 605                 goto err_unmap;
 606         }
 607
 608         eisa_set_drvdata (edev, shpnt);
 609
 610         rc = scsi_add_host (shpnt, dev);
 611         if (rc)
 612                 goto err_irq;
 613
 614         scsi_scan_host (shpnt);
 615         return 0;
 616
 617  err_irq:
 618         free_irq(irq_level, shpnt);
 619  err_unmap:
 620         dma_unmap_single (&edev->dev, host->ecb_dma_addr,
 621                           sizeof (host->ecb), DMA_BIDIRECTIONAL);
 622  err_host_put:
 623         scsi_host_put (shpnt);
 624  err_release_region:
 625         release_region(slotbase, SLOTSIZE);
 626
 627         return -ENODEV;
 628 }
 629
 630 static int aha1740_remove (struct device *dev)
 631 {
 632         struct Scsi_Host *shpnt = dev_get_drvdata(dev);
 633         struct aha1740_hostdata *host = HOSTDATA (shpnt);
 634
 635         scsi_remove_host(shpnt);
 636
 637         free_irq (shpnt->irq, shpnt);
 638         dma_unmap_single (dev, host->ecb_dma_addr,
 639                           sizeof (host->ecb), DMA_BIDIRECTIONAL);
 640         release_region (shpnt->io_port, SLOTSIZE);
 641
 642         scsi_host_put (shpnt);
 643
 644         return 0;
 645 }
 646
 647 static struct eisa_device_id aha1740_ids[] = {
 648         { "ADP0000" },          /* 1740  */
 649         { "ADP0001" },          /* 1740A */
 650         { "ADP0002" },          /* 1742A */
 651         { "ADP0400" },          /* 1744  */
 652         { "" }
 653 };
 654 MODULE_DEVICE_TABLE(eisa, aha1740_ids);
 655
 656 static struct eisa_driver aha1740_driver = {
 657         .id_table = aha1740_ids,
 658         .driver   = {
 659                 .name    = "aha1740",
 660                 .probe   = aha1740_probe,
 661                 .remove  = aha1740_remove,
 662         },
 663 };
 664
 665 static __init int aha1740_init (void)
 666 {
 667         return eisa_driver_register (&aha1740_driver);
 668 }
 669
 670 static __exit void aha1740_exit (void)
 671 {
 672         eisa_driver_unregister (&aha1740_driver);
 673 }
 674
 675 module_init (aha1740_init);
 676 module_exit (aha1740_exit);
 677
 678 MODULE_LICENSE("GPL");