drivers/scsi/g_NCR5380.c

   1 /*
   2  * Generic Generic NCR5380 driver
   3  *
   4  * Copyright 1993, Drew Eckhardt
   5  *      Visionary Computing
   6  *      (Unix and Linux consulting and custom programming)
   7  *      drew@colorado.edu
   8  *      +1 (303) 440-4894
   9  *
  10  * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
  11  *    K.Lentin@cs.monash.edu.au
  12  *
  13  * NCR53C400A extensions (c) 1996, Ingmar Baumgart
  14  *    ingmar@gonzo.schwaben.de
  15  *
  16  * DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
  17  * ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
  18  *
  19  * Added ISAPNP support for DTC436 adapters,
  20  * Thomas Sailer, sailer@ife.ee.ethz.ch
  21  *
  22  * See Documentation/scsi/g_NCR5380.txt for more info.
  23  */
  24
  25 #include <asm/io.h>
  26 #include <linux/blkdev.h>
  27 #include <linux/module.h>
  28 #include <scsi/scsi_host.h>
  29 #include "g_NCR5380.h"
  30 #include "NCR5380.h"
  31 #include <linux/init.h>
  32 #include <linux/ioport.h>
  33 #include <linux/isa.h>
  34 #include <linux/pnp.h>
  35 #include <linux/interrupt.h>
  36
  37 #define MAX_CARDS 8
  38
  39 /* old-style parameters for compatibility */
  40 static int ncr_irq;
  41 static int ncr_addr;
  42 static int ncr_5380;
  43 static int ncr_53c400;
  44 static int ncr_53c400a;
  45 static int dtc_3181e;
  46 static int hp_c2502;
  47 module_param(ncr_irq, int, 0);
  48 module_param(ncr_addr, int, 0);
  49 module_param(ncr_5380, int, 0);
  50 module_param(ncr_53c400, int, 0);
  51 module_param(ncr_53c400a, int, 0);
  52 module_param(dtc_3181e, int, 0);
  53 module_param(hp_c2502, int, 0);
  54
  55 static int irq[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  56 module_param_array(irq, int, NULL, 0);
  57 MODULE_PARM_DESC(irq, "IRQ number(s)");
  58
  59 static int base[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  60 module_param_array(base, int, NULL, 0);
  61 MODULE_PARM_DESC(base, "base address(es)");
  62
  63 static int card[] = { -1, -1, -1, -1, -1, -1, -1, -1 };
  64 module_param_array(card, int, NULL, 0);
  65 MODULE_PARM_DESC(card, "card type (0=NCR5380, 1=NCR53C400, 2=NCR53C400A, 3=DTC3181E, 4=HP C2502)");
  66
  67 MODULE_ALIAS("g_NCR5380_mmio");
  68 MODULE_LICENSE("GPL");
  69
  70 /*
  71  * Configure I/O address of 53C400A or DTC436 by writing magic numbers
  72  * to ports 0x779 and 0x379.
  73  */
  74 static void magic_configure(int idx, u8 irq, u8 magic[])
  75 {
  76         u8 cfg = 0;
  77
  78         outb(magic[0], 0x779);
  79         outb(magic[1], 0x379);
  80         outb(magic[2], 0x379);
  81         outb(magic[3], 0x379);
  82         outb(magic[4], 0x379);
  83
  84         /* allowed IRQs for HP C2502 */
  85         if (irq != 2 && irq != 3 && irq != 4 && irq != 5 && irq != 7)
  86                 irq = 0;
  87         if (idx >= 0 && idx <= 7)
  88                 cfg = 0x80 | idx | (irq << 4);
  89         outb(cfg, 0x379);
  90 }
  91
  92 static unsigned int ncr_53c400a_ports[] = {
  93         0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
  94 };
  95 static unsigned int dtc_3181e_ports[] = {
  96         0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
  97 };
  98 static u8 ncr_53c400a_magic[] = {       /* 53C400A & DTC436 */
  99         0x59, 0xb9, 0xc5, 0xae, 0xa6
 100 };
 101 static u8 hp_c2502_magic[] = {  /* HP C2502 */
 102         0x0f, 0x22, 0xf0, 0x20, 0x80
 103 };
 104
 105 static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
 106                         struct device *pdev, int base, int irq, int board)
 107 {
 108         bool is_pmio = base <= 0xffff;
 109         int ret;
 110         int flags = 0;
 111         unsigned int *ports = NULL;
 112         u8 *magic = NULL;
 113         int i;
 114         int port_idx = -1;
 115         unsigned long region_size;
 116         struct Scsi_Host *instance;
 117         struct NCR5380_hostdata *hostdata;
 118         u8 __iomem *iomem;
 119
 120         switch (board) {
 121         case BOARD_NCR5380:
 122                 flags = FLAG_NO_PSEUDO_DMA | FLAG_DMA_FIXUP;
 123                 break;
 124         case BOARD_NCR53C400A:
 125                 ports = ncr_53c400a_ports;
 126                 magic = ncr_53c400a_magic;
 127                 break;
 128         case BOARD_HP_C2502:
 129                 ports = ncr_53c400a_ports;
 130                 magic = hp_c2502_magic;
 131                 break;
 132         case BOARD_DTC3181E:
 133                 ports = dtc_3181e_ports;
 134                 magic = ncr_53c400a_magic;
 135                 break;
 136         }
 137
 138         if (is_pmio && ports && magic) {
 139                 /* wakeup sequence for the NCR53C400A and DTC3181E */
 140
 141                 /* Disable the adapter and look for a free io port */
 142                 magic_configure(-1, 0, magic);
 143
 144                 region_size = 16;
 145                 if (base)
 146                         for (i = 0; ports[i]; i++) {
 147                                 if (base == ports[i]) { /* index found */
 148                                         if (!request_region(ports[i],
 149                                                             region_size,
 150                                                             "ncr53c80"))
 151                                                 return -EBUSY;
 152                                         break;
 153                                 }
 154                         }
 155                 else
 156                         for (i = 0; ports[i]; i++) {
 157                                 if (!request_region(ports[i], region_size,
 158                                                     "ncr53c80"))
 159                                         continue;
 160                                 if (inb(ports[i]) == 0xff)
 161                                         break;
 162                                 release_region(ports[i], region_size);
 163                         }
 164                 if (ports[i]) {
 165                         /* At this point we have our region reserved */
 166                         magic_configure(i, 0, magic); /* no IRQ yet */
 167                         base = ports[i];
 168                         outb(0xc0, base + 9);
 169                         if (inb(base + 9) != 0x80) {
 170                                 ret = -ENODEV;
 171                                 goto out_release;
 172                         }
 173                         port_idx = i;
 174                 } else
 175                         return -EINVAL;
 176         } else if (is_pmio) {
 177                 /* NCR5380 - no configuration, just grab */
 178                 region_size = 8;
 179                 if (!base || !request_region(base, region_size, "ncr5380"))
 180                         return -EBUSY;
 181         } else {        /* MMIO */
 182                 region_size = NCR53C400_region_size;
 183                 if (!request_mem_region(base, region_size, "ncr5380"))
 184                         return -EBUSY;
 185         }
 186
 187         if (is_pmio)
 188                 iomem = ioport_map(base, region_size);
 189         else
 190                 iomem = ioremap(base, region_size);
 191
 192         if (!iomem) {
 193                 ret = -ENOMEM;
 194                 goto out_release;
 195         }
 196
 197         instance = scsi_host_alloc(tpnt, sizeof(struct NCR5380_hostdata));
 198         if (instance == NULL) {
 199                 ret = -ENOMEM;
 200                 goto out_unmap;
 201         }
 202         hostdata = shost_priv(instance);
 203
 204         hostdata->io = iomem;
 205         hostdata->region_size = region_size;
 206
 207         if (is_pmio) {
 208                 hostdata->io_port = base;
 209                 hostdata->io_width = 1; /* 8-bit PDMA by default */
 210                 hostdata->offset = 0;
 211
 212                 /*
 213                  * On NCR53C400 boards, NCR5380 registers are mapped 8 past
 214                  * the base address.
 215                  */
 216                 switch (board) {
 217                 case BOARD_NCR53C400:
 218                         hostdata->io_port += 8;
 219                         hostdata->c400_ctl_status = 0;
 220                         hostdata->c400_blk_cnt = 1;
 221                         hostdata->c400_host_buf = 4;
 222                         break;
 223                 case BOARD_DTC3181E:
 224                         hostdata->io_width = 2; /* 16-bit PDMA */
 225                         /* fall through */
 226                 case BOARD_NCR53C400A:
 227                 case BOARD_HP_C2502:
 228                         hostdata->c400_ctl_status = 9;
 229                         hostdata->c400_blk_cnt = 10;
 230                         hostdata->c400_host_buf = 8;
 231                         break;
 232                 }
 233         } else {
 234                 hostdata->base = base;
 235                 hostdata->offset = NCR53C400_mem_base;
 236                 switch (board) {
 237                 case BOARD_NCR53C400:
 238                         hostdata->c400_ctl_status = 0x100;
 239                         hostdata->c400_blk_cnt = 0x101;
 240                         hostdata->c400_host_buf = 0x104;
 241                         break;
 242                 case BOARD_DTC3181E:
 243                 case BOARD_NCR53C400A:
 244                 case BOARD_HP_C2502:
 245                         pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
 246                         ret = -EINVAL;
 247                         goto out_unregister;
 248                 }
 249         }
 250
 251         ret = NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP);
 252         if (ret)
 253                 goto out_unregister;
 254
 255         switch (board) {
 256         case BOARD_NCR53C400:
 257         case BOARD_DTC3181E:
 258         case BOARD_NCR53C400A:
 259         case BOARD_HP_C2502:
 260                 NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 261         }
 262
 263         NCR5380_maybe_reset_bus(instance);
 264
 265         if (irq != IRQ_AUTO)
 266                 instance->irq = irq;
 267         else
 268                 instance->irq = NCR5380_probe_irq(instance, 0xffff);
 269
 270         /* Compatibility with documented NCR5380 kernel parameters */
 271         if (instance->irq == 255)
 272                 instance->irq = NO_IRQ;
 273
 274         if (instance->irq != NO_IRQ) {
 275                 /* set IRQ for HP C2502 */
 276                 if (board == BOARD_HP_C2502)
 277                         magic_configure(port_idx, instance->irq, magic);
 278                 if (request_irq(instance->irq, generic_NCR5380_intr,
 279                                 0, "NCR5380", instance)) {
 280                         printk(KERN_WARNING "scsi%d : IRQ%d not free, interrupts disabled\n", instance->host_no, instance->irq);
 281                         instance->irq = NO_IRQ;
 282                 }
 283         }
 284
 285         if (instance->irq == NO_IRQ) {
 286                 printk(KERN_INFO "scsi%d : interrupts not enabled. for better interactive performance,\n", instance->host_no);
 287                 printk(KERN_INFO "scsi%d : please jumper the board for a free IRQ.\n", instance->host_no);
 288         }
 289
 290         ret = scsi_add_host(instance, pdev);
 291         if (ret)
 292                 goto out_free_irq;
 293         scsi_scan_host(instance);
 294         dev_set_drvdata(pdev, instance);
 295         return 0;
 296
 297 out_free_irq:
 298         if (instance->irq != NO_IRQ)
 299                 free_irq(instance->irq, instance);
 300         NCR5380_exit(instance);
 301 out_unregister:
 302         scsi_host_put(instance);
 303 out_unmap:
 304         iounmap(iomem);
 305 out_release:
 306         if (is_pmio)
 307                 release_region(base, region_size);
 308         else
 309                 release_mem_region(base, region_size);
 310         return ret;
 311 }
 312
 313 static void generic_NCR5380_release_resources(struct Scsi_Host *instance)
 314 {
 315         struct NCR5380_hostdata *hostdata = shost_priv(instance);
 316         void __iomem *iomem = hostdata->io;
 317         unsigned long io_port = hostdata->io_port;
 318         unsigned long base = hostdata->base;
 319         unsigned long region_size = hostdata->region_size;
 320
 321         scsi_remove_host(instance);
 322         if (instance->irq != NO_IRQ)
 323                 free_irq(instance->irq, instance);
 324         NCR5380_exit(instance);
 325         scsi_host_put(instance);
 326         iounmap(iomem);
 327         if (io_port)
 328                 release_region(io_port, region_size);
 329         else
 330                 release_mem_region(base, region_size);
 331 }
 332
 333 /**
 334  *      generic_NCR5380_pread - pseudo DMA read
 335  *      @hostdata: scsi host private data
 336  *      @dst: buffer to read into
 337  *      @len: buffer length
 338  *
 339  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 340  *      controller
 341  */
 342
 343 static inline int generic_NCR5380_pread(struct NCR5380_hostdata *hostdata,
 344                                         unsigned char *dst, int len)
 345 {
 346         int blocks = len / 128;
 347         int start = 0;
 348
 349         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
 350         NCR5380_write(hostdata->c400_blk_cnt, blocks);
 351         while (1) {
 352                 if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
 353                         break;
 354                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 355                         printk(KERN_ERR "53C400r: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 356                         return -1;
 357                 }
 358                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 359                         ; /* FIXME - no timeout */
 360
 361                 if (hostdata->io_port && hostdata->io_width == 2)
 362                         insw(hostdata->io_port + hostdata->c400_host_buf,
 363                                                         dst + start, 64);
 364                 else if (hostdata->io_port)
 365                         insb(hostdata->io_port + hostdata->c400_host_buf,
 366                                                         dst + start, 128);
 367                 else
 368                         memcpy_fromio(dst + start,
 369                                 hostdata->io + NCR53C400_host_buffer, 128);
 370
 371                 start += 128;
 372                 blocks--;
 373         }
 374
 375         if (blocks) {
 376                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 377                         ; /* FIXME - no timeout */
 378
 379                 if (hostdata->io_port && hostdata->io_width == 2)
 380                         insw(hostdata->io_port + hostdata->c400_host_buf,
 381                                                         dst + start, 64);
 382                 else if (hostdata->io_port)
 383                         insb(hostdata->io_port + hostdata->c400_host_buf,
 384                                                         dst + start, 128);
 385                 else
 386                         memcpy_fromio(dst + start,
 387                                 hostdata->io + NCR53C400_host_buffer, 128);
 388
 389                 start += 128;
 390                 blocks--;
 391         }
 392
 393         if (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ))
 394                 printk("53C400r: no 53C80 gated irq after transfer");
 395
 396         /* wait for 53C80 registers to be available */
 397         while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG))
 398                 ;
 399
 400         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER))
 401                 printk(KERN_ERR "53C400r: no end dma signal\n");
 402
 403         return 0;
 404 }
 405
 406 /**
 407  *      generic_NCR5380_pwrite - pseudo DMA write
 408  *      @hostdata: scsi host private data
 409  *      @dst: buffer to read into
 410  *      @len: buffer length
 411  *
 412  *      Perform a pseudo DMA mode read from an NCR53C400 or equivalent
 413  *      controller
 414  */
 415
 416 static inline int generic_NCR5380_pwrite(struct NCR5380_hostdata *hostdata,
 417                                          unsigned char *src, int len)
 418 {
 419         int blocks = len / 128;
 420         int start = 0;
 421
 422         NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
 423         NCR5380_write(hostdata->c400_blk_cnt, blocks);
 424         while (1) {
 425                 if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
 426                         printk(KERN_ERR "53C400w: Got 53C80_IRQ start=%d, blocks=%d\n", start, blocks);
 427                         return -1;
 428                 }
 429
 430                 if (NCR5380_read(hostdata->c400_blk_cnt) == 0)
 431                         break;
 432                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 433                         ; // FIXME - timeout
 434
 435                 if (hostdata->io_port && hostdata->io_width == 2)
 436                         outsw(hostdata->io_port + hostdata->c400_host_buf,
 437                                                         src + start, 64);
 438                 else if (hostdata->io_port)
 439                         outsb(hostdata->io_port + hostdata->c400_host_buf,
 440                                                         src + start, 128);
 441                 else
 442                         memcpy_toio(hostdata->io + NCR53C400_host_buffer,
 443                                     src + start, 128);
 444
 445                 start += 128;
 446                 blocks--;
 447         }
 448         if (blocks) {
 449                 while (NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
 450                         ; // FIXME - no timeout
 451
 452                 if (hostdata->io_port && hostdata->io_width == 2)
 453                         outsw(hostdata->io_port + hostdata->c400_host_buf,
 454                                                         src + start, 64);
 455                 else if (hostdata->io_port)
 456                         outsb(hostdata->io_port + hostdata->c400_host_buf,
 457                                                         src + start, 128);
 458                 else
 459                         memcpy_toio(hostdata->io + NCR53C400_host_buffer,
 460                                     src + start, 128);
 461
 462                 start += 128;
 463                 blocks--;
 464         }
 465
 466         /* wait for 53C80 registers to be available */
 467         while (!(NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)) {
 468                 udelay(4); /* DTC436 chip hangs without this */
 469                 /* FIXME - no timeout */
 470         }
 471
 472         if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_END_DMA_TRANSFER)) {
 473                 printk(KERN_ERR "53C400w: no end dma signal\n");
 474         }
 475
 476         while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT))
 477                 ;       // TIMEOUT
 478         return 0;
 479 }
 480
 481 static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata,
 482                                         struct scsi_cmnd *cmd)
 483 {
 484         int transfersize = cmd->transfersize;
 485
 486         if (hostdata->flags & FLAG_NO_PSEUDO_DMA)
 487                 return 0;
 488
 489         /* Limit transfers to 32K, for xx400 & xx406
 490          * pseudoDMA that transfers in 128 bytes blocks.
 491          */
 492         if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
 493             !(cmd->SCp.this_residual % transfersize))
 494                 transfersize = 32 * 1024;
 495
 496         /* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
 497         if (transfersize % 128)
 498                 transfersize = 0;
 499
 500         return transfersize;
 501 }
 502
 503 /*
 504  *      Include the NCR5380 core code that we build our driver around
 505  */
 506
 507 #include "NCR5380.c"
 508
 509 static struct scsi_host_template driver_template = {
 510         .module                 = THIS_MODULE,
 511         .proc_name              = DRV_MODULE_NAME,
 512         .name                   = "Generic NCR5380/NCR53C400 SCSI",
 513         .info                   = generic_NCR5380_info,
 514         .queuecommand           = generic_NCR5380_queue_command,
 515         .eh_abort_handler       = generic_NCR5380_abort,
 516         .eh_bus_reset_handler   = generic_NCR5380_bus_reset,
 517         .can_queue              = 16,
 518         .this_id                = 7,
 519         .sg_tablesize           = SG_ALL,
 520         .cmd_per_lun            = 2,
 521         .use_clustering         = DISABLE_CLUSTERING,
 522         .cmd_size               = NCR5380_CMD_SIZE,
 523         .max_sectors            = 128,
 524 };
 525
 526
 527 static int generic_NCR5380_isa_match(struct device *pdev, unsigned int ndev)
 528 {
 529         int ret = generic_NCR5380_init_one(&driver_template, pdev, base[ndev],
 530                                           irq[ndev], card[ndev]);
 531         if (ret) {
 532                 if (base[ndev])
 533                         printk(KERN_WARNING "Card not found at address 0x%03x\n",
 534                                base[ndev]);
 535                 return 0;
 536         }
 537
 538         return 1;
 539 }
 540
 541 static int generic_NCR5380_isa_remove(struct device *pdev,
 542                                    unsigned int ndev)
 543 {
 544         generic_NCR5380_release_resources(dev_get_drvdata(pdev));
 545         dev_set_drvdata(pdev, NULL);
 546         return 0;
 547 }
 548
 549 static struct isa_driver generic_NCR5380_isa_driver = {
 550         .match          = generic_NCR5380_isa_match,
 551         .remove         = generic_NCR5380_isa_remove,
 552         .driver         = {
 553                 .name   = DRV_MODULE_NAME
 554         },
 555 };
 556
 557 #ifdef CONFIG_PNP
 558 static struct pnp_device_id generic_NCR5380_pnp_ids[] = {
 559         { .id = "DTC436e", .driver_data = BOARD_DTC3181E },
 560         { .id = "" }
 561 };
 562 MODULE_DEVICE_TABLE(pnp, generic_NCR5380_pnp_ids);
 563
 564 static int generic_NCR5380_pnp_probe(struct pnp_dev *pdev,
 565                                const struct pnp_device_id *id)
 566 {
 567         int base, irq;
 568
 569         if (pnp_activate_dev(pdev) < 0)
 570                 return -EBUSY;
 571
 572         base = pnp_port_start(pdev, 0);
 573         irq = pnp_irq(pdev, 0);
 574
 575         return generic_NCR5380_init_one(&driver_template, &pdev->dev, base, irq,
 576                                        id->driver_data);
 577 }
 578
 579 static void generic_NCR5380_pnp_remove(struct pnp_dev *pdev)
 580 {
 581         generic_NCR5380_release_resources(pnp_get_drvdata(pdev));
 582         pnp_set_drvdata(pdev, NULL);
 583 }
 584
 585 static struct pnp_driver generic_NCR5380_pnp_driver = {
 586         .name           = DRV_MODULE_NAME,
 587         .id_table       = generic_NCR5380_pnp_ids,
 588         .probe          = generic_NCR5380_pnp_probe,
 589         .remove         = generic_NCR5380_pnp_remove,
 590 };
 591 #endif /* defined(CONFIG_PNP) */
 592
 593 static int pnp_registered, isa_registered;
 594
 595 static int __init generic_NCR5380_init(void)
 596 {
 597         int ret = 0;
 598
 599         /* compatibility with old-style parameters */
 600         if (irq[0] == 0 && base[0] == 0 && card[0] == -1) {
 601                 irq[0] = ncr_irq;
 602                 base[0] = ncr_addr;
 603                 if (ncr_5380)
 604                         card[0] = BOARD_NCR5380;
 605                 if (ncr_53c400)
 606                         card[0] = BOARD_NCR53C400;
 607                 if (ncr_53c400a)
 608                         card[0] = BOARD_NCR53C400A;
 609                 if (dtc_3181e)
 610                         card[0] = BOARD_DTC3181E;
 611                 if (hp_c2502)
 612                         card[0] = BOARD_HP_C2502;
 613         }
 614
 615 #ifdef CONFIG_PNP
 616         if (!pnp_register_driver(&generic_NCR5380_pnp_driver))
 617                 pnp_registered = 1;
 618 #endif
 619         ret = isa_register_driver(&generic_NCR5380_isa_driver, MAX_CARDS);
 620         if (!ret)
 621                 isa_registered = 1;
 622
 623         return (pnp_registered || isa_registered) ? 0 : ret;
 624 }
 625
 626 static void __exit generic_NCR5380_exit(void)
 627 {
 628 #ifdef CONFIG_PNP
 629         if (pnp_registered)
 630                 pnp_unregister_driver(&generic_NCR5380_pnp_driver);
 631 #endif
 632         if (isa_registered)
 633                 isa_unregister_driver(&generic_NCR5380_isa_driver);
 634 }
 635
 636 module_init(generic_NCR5380_init);
 637 module_exit(generic_NCR5380_exit);