Pileus Git - ~andy/linux/blob - drivers/staging/vme/vme.c

   1 /*
   2  * VME Bridge Framework
   3  *
   4  * Author: Martyn Welch <martyn.welch@gefanuc.com>
   5  * Copyright 2008 GE Fanuc Intelligent Platforms Embedded Systems, Inc.
   6  *
   7  * Based on work by Tom Armistead and Ajit Prem
   8  * Copyright 2004 Motorola Inc.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #include <linux/version.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/mm.h>
  20 #include <linux/types.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/pci.h>
  24 #include <linux/poll.h>
  25 #include <linux/highmem.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/device.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/syscalls.h>
  31 #include <linux/mutex.h>
  32 #include <linux/spinlock.h>
  33
  34 #include "vme.h"
  35 #include "vme_bridge.h"
  36
  37 /* Bitmask and mutex to keep track of bridge numbers */
  38 static unsigned int vme_bus_numbers;
  39 DEFINE_MUTEX(vme_bus_num_mtx);
  40
  41 static void __exit vme_exit (void);
  42 static int __init vme_init (void);
  43
  44
  45 /*
  46  * Find the bridge resource associated with a specific device resource
  47  */
  48 static struct vme_bridge *dev_to_bridge(struct device *dev)
  49 {
  50         return dev->platform_data;
  51 }
  52
  53 /*
  54  * Find the bridge that the resource is associated with.
  55  */
  56 static struct vme_bridge *find_bridge(struct vme_resource *resource)
  57 {
  58         /* Get list to search */
  59         switch (resource->type) {
  60         case VME_MASTER:
  61                 return list_entry(resource->entry, struct vme_master_resource,
  62                         list)->parent;
  63                 break;
  64         case VME_SLAVE:
  65                 return list_entry(resource->entry, struct vme_slave_resource,
  66                         list)->parent;
  67                 break;
  68         case VME_DMA:
  69                 return list_entry(resource->entry, struct vme_dma_resource,
  70                         list)->parent;
  71                 break;
  72         case VME_LM:
  73                 return list_entry(resource->entry, struct vme_lm_resource,
  74                         list)->parent;
  75                 break;
  76         default:
  77                 printk(KERN_ERR "Unknown resource type\n");
  78                 return NULL;
  79                 break;
  80         }
  81 }
  82
  83 /*
  84  * Allocate a contiguous block of memory for use by the driver. This is used to
  85  * create the buffers for the slave windows.
  86  *
  87  * XXX VME bridges could be available on buses other than PCI. At the momment
  88  *     this framework only supports PCI devices.
  89  */
  90 void * vme_alloc_consistent(struct vme_resource *resource, size_t size,
  91         dma_addr_t *dma)
  92 {
  93         struct vme_bridge *bridge;
  94         struct pci_dev *pdev;
  95
  96         if(resource == NULL) {
  97                 printk("No resource\n");
  98                 return NULL;
  99         }
 100
 101         bridge = find_bridge(resource);
 102         if(bridge == NULL) {
 103                 printk("Can't find bridge\n");
 104                 return NULL;
 105         }
 106
 107         /* Find pci_dev container of dev */
 108         if (bridge->parent == NULL) {
 109                 printk("Dev entry NULL\n");
 110                 return NULL;
 111         }
 112         pdev = container_of(bridge->parent, struct pci_dev, dev);
 113
 114         return pci_alloc_consistent(pdev, size, dma);
 115 }
 116 EXPORT_SYMBOL(vme_alloc_consistent);
 117
 118 /*
 119  * Free previously allocated contiguous block of memory.
 120  *
 121  * XXX VME bridges could be available on buses other than PCI. At the momment
 122  *     this framework only supports PCI devices.
 123  */
 124 void vme_free_consistent(struct vme_resource *resource, size_t size,
 125         void *vaddr, dma_addr_t dma)
 126 {
 127         struct vme_bridge *bridge;
 128         struct pci_dev *pdev;
 129
 130         if(resource == NULL) {
 131                 printk("No resource\n");
 132                 return;
 133         }
 134
 135         bridge = find_bridge(resource);
 136         if(bridge == NULL) {
 137                 printk("Can't find bridge\n");
 138                 return;
 139         }
 140
 141         /* Find pci_dev container of dev */
 142         pdev = container_of(bridge->parent, struct pci_dev, dev);
 143
 144         pci_free_consistent(pdev, size, vaddr, dma);
 145 }
 146 EXPORT_SYMBOL(vme_free_consistent);
 147
 148 size_t vme_get_size(struct vme_resource *resource)
 149 {
 150         int enabled, retval;
 151         unsigned long long base, size;
 152         dma_addr_t buf_base;
 153         vme_address_t aspace;
 154         vme_cycle_t cycle;
 155         vme_width_t dwidth;
 156
 157         switch (resource->type) {
 158         case VME_MASTER:
 159                 retval = vme_master_get(resource, &enabled, &base, &size,
 160                         &aspace, &cycle, &dwidth);
 161
 162                 return size;
 163                 break;
 164         case VME_SLAVE:
 165                 retval = vme_slave_get(resource, &enabled, &base, &size,
 166                         &buf_base, &aspace, &cycle);
 167
 168                 return size;
 169                 break;
 170         case VME_DMA:
 171                 return 0;
 172                 break;
 173         default:
 174                 printk(KERN_ERR "Unknown resource type\n");
 175                 return 0;
 176                 break;
 177         }
 178 }
 179 EXPORT_SYMBOL(vme_get_size);
 180
 181 static int vme_check_window(vme_address_t aspace, unsigned long long vme_base,
 182         unsigned long long size)
 183 {
 184         int retval = 0;
 185
 186         switch (aspace) {
 187         case VME_A16:
 188                 if (((vme_base + size) > VME_A16_MAX) ||
 189                                 (vme_base > VME_A16_MAX))
 190                         retval = -EFAULT;
 191                 break;
 192         case VME_A24:
 193                 if (((vme_base + size) > VME_A24_MAX) ||
 194                                 (vme_base > VME_A24_MAX))
 195                         retval = -EFAULT;
 196                 break;
 197         case VME_A32:
 198                 if (((vme_base + size) > VME_A32_MAX) ||
 199                                 (vme_base > VME_A32_MAX))
 200                         retval = -EFAULT;
 201                 break;
 202         case VME_A64:
 203                 /*
 204                  * Any value held in an unsigned long long can be used as the
 205                  * base
 206                  */
 207                 break;
 208         case VME_CRCSR:
 209                 if (((vme_base + size) > VME_CRCSR_MAX) ||
 210                                 (vme_base > VME_CRCSR_MAX))
 211                         retval = -EFAULT;
 212                 break;
 213         case VME_USER1:
 214         case VME_USER2:
 215         case VME_USER3:
 216         case VME_USER4:
 217                 /* User Defined */
 218                 break;
 219         default:
 220                 printk("Invalid address space\n");
 221                 retval = -EINVAL;
 222                 break;
 223         }
 224
 225         return retval;
 226 }
 227
 228 /*
 229  * Request a slave image with specific attributes, return some unique
 230  * identifier.
 231  */
 232 struct vme_resource * vme_slave_request(struct device *dev,
 233         vme_address_t address, vme_cycle_t cycle)
 234 {
 235         struct vme_bridge *bridge;
 236         struct list_head *slave_pos = NULL;
 237         struct vme_slave_resource *allocated_image = NULL;
 238         struct vme_slave_resource *slave_image = NULL;
 239         struct vme_resource *resource = NULL;
 240
 241         bridge = dev_to_bridge(dev);
 242         if (bridge == NULL) {
 243                 printk(KERN_ERR "Can't find VME bus\n");
 244                 goto err_bus;
 245         }
 246
 247         /* Loop through slave resources */
 248         list_for_each(slave_pos, &(bridge->slave_resources)) {
 249                 slave_image = list_entry(slave_pos,
 250                         struct vme_slave_resource, list);
 251
 252                 if (slave_image == NULL) {
 253                         printk("Registered NULL Slave resource\n");
 254                         continue;
 255                 }
 256
 257                 /* Find an unlocked and compatible image */
 258                 mutex_lock(&(slave_image->mtx));
 259                 if(((slave_image->address_attr & address) == address) &&
 260                         ((slave_image->cycle_attr & cycle) == cycle) &&
 261                         (slave_image->locked == 0)) {
 262
 263                         slave_image->locked = 1;
 264                         mutex_unlock(&(slave_image->mtx));
 265                         allocated_image = slave_image;
 266                         break;
 267                 }
 268                 mutex_unlock(&(slave_image->mtx));
 269         }
 270
 271         /* No free image */
 272         if (allocated_image == NULL)
 273                 goto err_image;
 274
 275         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 276         if (resource == NULL) {
 277                 printk(KERN_WARNING "Unable to allocate resource structure\n");
 278                 goto err_alloc;
 279         }
 280         resource->type = VME_SLAVE;
 281         resource->entry = &(allocated_image->list);
 282
 283         return resource;
 284
 285 err_alloc:
 286         /* Unlock image */
 287         mutex_lock(&(slave_image->mtx));
 288         slave_image->locked = 0;
 289         mutex_unlock(&(slave_image->mtx));
 290 err_image:
 291 err_bus:
 292         return NULL;
 293 }
 294 EXPORT_SYMBOL(vme_slave_request);
 295
 296 int vme_slave_set (struct vme_resource *resource, int enabled,
 297         unsigned long long vme_base, unsigned long long size,
 298         dma_addr_t buf_base, vme_address_t aspace, vme_cycle_t cycle)
 299 {
 300         struct vme_bridge *bridge = find_bridge(resource);
 301         struct vme_slave_resource *image;
 302         int retval;
 303
 304         if (resource->type != VME_SLAVE) {
 305                 printk("Not a slave resource\n");
 306                 return -EINVAL;
 307         }
 308
 309         image = list_entry(resource->entry, struct vme_slave_resource, list);
 310
 311         if (bridge->slave_set == NULL) {
 312                 printk("Function not supported\n");
 313                 return -ENOSYS;
 314         }
 315
 316         if(!(((image->address_attr & aspace) == aspace) &&
 317                 ((image->cycle_attr & cycle) == cycle))) {
 318                 printk("Invalid attributes\n");
 319                 return -EINVAL;
 320         }
 321
 322         retval = vme_check_window(aspace, vme_base, size);
 323         if(retval)
 324                 return retval;
 325
 326         return bridge->slave_set(image, enabled, vme_base, size, buf_base,
 327                 aspace, cycle);
 328 }
 329 EXPORT_SYMBOL(vme_slave_set);
 330
 331 int vme_slave_get (struct vme_resource *resource, int *enabled,
 332         unsigned long long *vme_base, unsigned long long *size,
 333         dma_addr_t *buf_base, vme_address_t *aspace, vme_cycle_t *cycle)
 334 {
 335         struct vme_bridge *bridge = find_bridge(resource);
 336         struct vme_slave_resource *image;
 337
 338         if (resource->type != VME_SLAVE) {
 339                 printk("Not a slave resource\n");
 340                 return -EINVAL;
 341         }
 342
 343         image = list_entry(resource->entry, struct vme_slave_resource, list);
 344
 345         if (bridge->slave_get == NULL) {
 346                 printk("vme_slave_get not supported\n");
 347                 return -EINVAL;
 348         }
 349
 350         return bridge->slave_get(image, enabled, vme_base, size, buf_base,
 351                 aspace, cycle);
 352 }
 353 EXPORT_SYMBOL(vme_slave_get);
 354
 355 void vme_slave_free(struct vme_resource *resource)
 356 {
 357         struct vme_slave_resource *slave_image;
 358
 359         if (resource->type != VME_SLAVE) {
 360                 printk("Not a slave resource\n");
 361                 return;
 362         }
 363
 364         slave_image = list_entry(resource->entry, struct vme_slave_resource,
 365                 list);
 366         if (slave_image == NULL) {
 367                 printk("Can't find slave resource\n");
 368                 return;
 369         }
 370
 371         /* Unlock image */
 372         mutex_lock(&(slave_image->mtx));
 373         if (slave_image->locked == 0)
 374                 printk(KERN_ERR "Image is already free\n");
 375
 376         slave_image->locked = 0;
 377         mutex_unlock(&(slave_image->mtx));
 378
 379         /* Free up resource memory */
 380         kfree(resource);
 381 }
 382 EXPORT_SYMBOL(vme_slave_free);
 383
 384 /*
 385  * Request a master image with specific attributes, return some unique
 386  * identifier.
 387  */
 388 struct vme_resource * vme_master_request(struct device *dev,
 389         vme_address_t address, vme_cycle_t cycle, vme_width_t dwidth)
 390 {
 391         struct vme_bridge *bridge;
 392         struct list_head *master_pos = NULL;
 393         struct vme_master_resource *allocated_image = NULL;
 394         struct vme_master_resource *master_image = NULL;
 395         struct vme_resource *resource = NULL;
 396
 397         bridge = dev_to_bridge(dev);
 398         if (bridge == NULL) {
 399                 printk(KERN_ERR "Can't find VME bus\n");
 400                 goto err_bus;
 401         }
 402
 403         /* Loop through master resources */
 404         list_for_each(master_pos, &(bridge->master_resources)) {
 405                 master_image = list_entry(master_pos,
 406                         struct vme_master_resource, list);
 407
 408                 if (master_image == NULL) {
 409                         printk(KERN_WARNING "Registered NULL master resource\n");
 410                         continue;
 411                 }
 412
 413                 /* Find an unlocked and compatible image */
 414                 spin_lock(&(master_image->lock));
 415                 if(((master_image->address_attr & address) == address) &&
 416                         ((master_image->cycle_attr & cycle) == cycle) &&
 417                         ((master_image->width_attr & dwidth) == dwidth) &&
 418                         (master_image->locked == 0)) {
 419
 420                         master_image->locked = 1;
 421                         spin_unlock(&(master_image->lock));
 422                         allocated_image = master_image;
 423                         break;
 424                 }
 425                 spin_unlock(&(master_image->lock));
 426         }
 427
 428         /* Check to see if we found a resource */
 429         if (allocated_image == NULL) {
 430                 printk(KERN_ERR "Can't find a suitable resource\n");
 431                 goto err_image;
 432         }
 433
 434         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 435         if (resource == NULL) {
 436                 printk(KERN_ERR "Unable to allocate resource structure\n");
 437                 goto err_alloc;
 438         }
 439         resource->type = VME_MASTER;
 440         resource->entry = &(allocated_image->list);
 441
 442         return resource;
 443
 444         kfree(resource);
 445 err_alloc:
 446         /* Unlock image */
 447         spin_lock(&(master_image->lock));
 448         master_image->locked = 0;
 449         spin_unlock(&(master_image->lock));
 450 err_image:
 451 err_bus:
 452         return NULL;
 453 }
 454 EXPORT_SYMBOL(vme_master_request);
 455
 456 int vme_master_set (struct vme_resource *resource, int enabled,
 457         unsigned long long vme_base, unsigned long long size,
 458         vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth)
 459 {
 460         struct vme_bridge *bridge = find_bridge(resource);
 461         struct vme_master_resource *image;
 462         int retval;
 463
 464         if (resource->type != VME_MASTER) {
 465                 printk("Not a master resource\n");
 466                 return -EINVAL;
 467         }
 468
 469         image = list_entry(resource->entry, struct vme_master_resource, list);
 470
 471         if (bridge->master_set == NULL) {
 472                 printk("vme_master_set not supported\n");
 473                 return -EINVAL;
 474         }
 475
 476         if(!(((image->address_attr & aspace) == aspace) &&
 477                 ((image->cycle_attr & cycle) == cycle) &&
 478                 ((image->width_attr & dwidth) == dwidth))) {
 479                 printk("Invalid attributes\n");
 480                 return -EINVAL;
 481         }
 482
 483         retval = vme_check_window(aspace, vme_base, size);
 484         if(retval)
 485                 return retval;
 486
 487         return bridge->master_set(image, enabled, vme_base, size, aspace,
 488                 cycle, dwidth);
 489 }
 490 EXPORT_SYMBOL(vme_master_set);
 491
 492 int vme_master_get (struct vme_resource *resource, int *enabled,
 493         unsigned long long *vme_base, unsigned long long *size,
 494         vme_address_t *aspace, vme_cycle_t *cycle, vme_width_t *dwidth)
 495 {
 496         struct vme_bridge *bridge = find_bridge(resource);
 497         struct vme_master_resource *image;
 498
 499         if (resource->type != VME_MASTER) {
 500                 printk("Not a master resource\n");
 501                 return -EINVAL;
 502         }
 503
 504         image = list_entry(resource->entry, struct vme_master_resource, list);
 505
 506         if (bridge->master_get == NULL) {
 507                 printk("vme_master_set not supported\n");
 508                 return -EINVAL;
 509         }
 510
 511         return bridge->master_get(image, enabled, vme_base, size, aspace,
 512                 cycle, dwidth);
 513 }
 514 EXPORT_SYMBOL(vme_master_get);
 515
 516 /*
 517  * Read data out of VME space into a buffer.
 518  */
 519 ssize_t vme_master_read (struct vme_resource *resource, void *buf, size_t count,
 520         loff_t offset)
 521 {
 522         struct vme_bridge *bridge = find_bridge(resource);
 523         struct vme_master_resource *image;
 524         size_t length;
 525
 526         if (bridge->master_read == NULL) {
 527                 printk("Reading from resource not supported\n");
 528                 return -EINVAL;
 529         }
 530
 531         if (resource->type != VME_MASTER) {
 532                 printk("Not a master resource\n");
 533                 return -EINVAL;
 534         }
 535
 536         image = list_entry(resource->entry, struct vme_master_resource, list);
 537
 538         length = vme_get_size(resource);
 539
 540         if (offset > length) {
 541                 printk("Invalid Offset\n");
 542                 return -EFAULT;
 543         }
 544
 545         if ((offset + count) > length)
 546                 count = length - offset;
 547
 548         return bridge->master_read(image, buf, count, offset);
 549
 550 }
 551 EXPORT_SYMBOL(vme_master_read);
 552
 553 /*
 554  * Write data out to VME space from a buffer.
 555  */
 556 ssize_t vme_master_write (struct vme_resource *resource, void *buf,
 557         size_t count, loff_t offset)
 558 {
 559         struct vme_bridge *bridge = find_bridge(resource);
 560         struct vme_master_resource *image;
 561         size_t length;
 562
 563         if (bridge->master_write == NULL) {
 564                 printk("Writing to resource not supported\n");
 565                 return -EINVAL;
 566         }
 567
 568         if (resource->type != VME_MASTER) {
 569                 printk("Not a master resource\n");
 570                 return -EINVAL;
 571         }
 572
 573         image = list_entry(resource->entry, struct vme_master_resource, list);
 574
 575         length = vme_get_size(resource);
 576
 577         if (offset > length) {
 578                 printk("Invalid Offset\n");
 579                 return -EFAULT;
 580         }
 581
 582         if ((offset + count) > length)
 583                 count = length - offset;
 584
 585         return bridge->master_write(image, buf, count, offset);
 586 }
 587 EXPORT_SYMBOL(vme_master_write);
 588
 589 /*
 590  * Perform RMW cycle to provided location.
 591  */
 592 unsigned int vme_master_rmw (struct vme_resource *resource, unsigned int mask,
 593         unsigned int compare, unsigned int swap, loff_t offset)
 594 {
 595         struct vme_bridge *bridge = find_bridge(resource);
 596         struct vme_master_resource *image;
 597
 598         if (bridge->master_rmw == NULL) {
 599                 printk("Writing to resource not supported\n");
 600                 return -EINVAL;
 601         }
 602
 603         if (resource->type != VME_MASTER) {
 604                 printk("Not a master resource\n");
 605                 return -EINVAL;
 606         }
 607
 608         image = list_entry(resource->entry, struct vme_master_resource, list);
 609
 610         return bridge->master_rmw(image, mask, compare, swap, offset);
 611 }
 612 EXPORT_SYMBOL(vme_master_rmw);
 613
 614 void vme_master_free(struct vme_resource *resource)
 615 {
 616         struct vme_master_resource *master_image;
 617
 618         if (resource->type != VME_MASTER) {
 619                 printk("Not a master resource\n");
 620                 return;
 621         }
 622
 623         master_image = list_entry(resource->entry, struct vme_master_resource,
 624                 list);
 625         if (master_image == NULL) {
 626                 printk("Can't find master resource\n");
 627                 return;
 628         }
 629
 630         /* Unlock image */
 631         spin_lock(&(master_image->lock));
 632         if (master_image->locked == 0)
 633                 printk(KERN_ERR "Image is already free\n");
 634
 635         master_image->locked = 0;
 636         spin_unlock(&(master_image->lock));
 637
 638         /* Free up resource memory */
 639         kfree(resource);
 640 }
 641 EXPORT_SYMBOL(vme_master_free);
 642
 643 /*
 644  * Request a DMA controller with specific attributes, return some unique
 645  * identifier.
 646  */
 647 struct vme_resource *vme_request_dma(struct device *dev)
 648 {
 649         struct vme_bridge *bridge;
 650         struct list_head *dma_pos = NULL;
 651         struct vme_dma_resource *allocated_ctrlr = NULL;
 652         struct vme_dma_resource *dma_ctrlr = NULL;
 653         struct vme_resource *resource = NULL;
 654
 655         /* XXX Not checking resource attributes */
 656         printk(KERN_ERR "No VME resource Attribute tests done\n");
 657
 658         bridge = dev_to_bridge(dev);
 659         if (bridge == NULL) {
 660                 printk(KERN_ERR "Can't find VME bus\n");
 661                 goto err_bus;
 662         }
 663
 664         /* Loop through DMA resources */
 665         list_for_each(dma_pos, &(bridge->dma_resources)) {
 666                 dma_ctrlr = list_entry(dma_pos,
 667                         struct vme_dma_resource, list);
 668
 669                 if (dma_ctrlr == NULL) {
 670                         printk("Registered NULL DMA resource\n");
 671                         continue;
 672                 }
 673
 674                 /* Find an unlocked controller */
 675                 mutex_lock(&(dma_ctrlr->mtx));
 676                 if(dma_ctrlr->locked == 0) {
 677                         dma_ctrlr->locked = 1;
 678                         mutex_unlock(&(dma_ctrlr->mtx));
 679                         allocated_ctrlr = dma_ctrlr;
 680                         break;
 681                 }
 682                 mutex_unlock(&(dma_ctrlr->mtx));
 683         }
 684
 685         /* Check to see if we found a resource */
 686         if (allocated_ctrlr == NULL)
 687                 goto err_ctrlr;
 688
 689         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 690         if (resource == NULL) {
 691                 printk(KERN_WARNING "Unable to allocate resource structure\n");
 692                 goto err_alloc;
 693         }
 694         resource->type = VME_DMA;
 695         resource->entry = &(allocated_ctrlr->list);
 696
 697         return resource;
 698
 699 err_alloc:
 700         /* Unlock image */
 701         mutex_lock(&(dma_ctrlr->mtx));
 702         dma_ctrlr->locked = 0;
 703         mutex_unlock(&(dma_ctrlr->mtx));
 704 err_ctrlr:
 705 err_bus:
 706         return NULL;
 707 }
 708 EXPORT_SYMBOL(vme_request_dma);
 709
 710 /*
 711  * Start new list
 712  */
 713 struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource)
 714 {
 715         struct vme_dma_resource *ctrlr;
 716         struct vme_dma_list *dma_list;
 717
 718         if (resource->type != VME_DMA) {
 719                 printk("Not a DMA resource\n");
 720                 return NULL;
 721         }
 722
 723         ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
 724
 725         dma_list = (struct vme_dma_list *)kmalloc(
 726                 sizeof(struct vme_dma_list), GFP_KERNEL);
 727         if(dma_list == NULL) {
 728                 printk("Unable to allocate memory for new dma list\n");
 729                 return NULL;
 730         }
 731         INIT_LIST_HEAD(&(dma_list->entries));
 732         dma_list->parent = ctrlr;
 733         mutex_init(&(dma_list->mtx));
 734
 735         return dma_list;
 736 }
 737 EXPORT_SYMBOL(vme_new_dma_list);
 738
 739 /*
 740  * Create "Pattern" type attributes
 741  */
 742 struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern,
 743         vme_pattern_t type)
 744 {
 745         struct vme_dma_attr *attributes;
 746         struct vme_dma_pattern *pattern_attr;
 747
 748         attributes = (struct vme_dma_attr *)kmalloc(
 749                 sizeof(struct vme_dma_attr), GFP_KERNEL);
 750         if(attributes == NULL) {
 751                 printk("Unable to allocate memory for attributes structure\n");
 752                 goto err_attr;
 753         }
 754
 755         pattern_attr = (struct vme_dma_pattern *)kmalloc(
 756                 sizeof(struct vme_dma_pattern), GFP_KERNEL);
 757         if(pattern_attr == NULL) {
 758                 printk("Unable to allocate memory for pattern attributes\n");
 759                 goto err_pat;
 760         }
 761
 762         attributes->type = VME_DMA_PATTERN;
 763         attributes->private = (void *)pattern_attr;
 764
 765         pattern_attr->pattern = pattern;
 766         pattern_attr->type = type;
 767
 768         return attributes;
 769
 770         kfree(pattern_attr);
 771 err_pat:
 772         kfree(attributes);
 773 err_attr:
 774         return NULL;
 775 }
 776 EXPORT_SYMBOL(vme_dma_pattern_attribute);
 777
 778 /*
 779  * Create "PCI" type attributes
 780  */
 781 struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address)
 782 {
 783         struct vme_dma_attr *attributes;
 784         struct vme_dma_pci *pci_attr;
 785
 786         /* XXX Run some sanity checks here */
 787
 788         attributes = (struct vme_dma_attr *)kmalloc(
 789                 sizeof(struct vme_dma_attr), GFP_KERNEL);
 790         if(attributes == NULL) {
 791                 printk("Unable to allocate memory for attributes structure\n");
 792                 goto err_attr;
 793         }
 794
 795         pci_attr = (struct vme_dma_pci *)kmalloc(sizeof(struct vme_dma_pci),
 796                 GFP_KERNEL);
 797         if(pci_attr == NULL) {
 798                 printk("Unable to allocate memory for pci attributes\n");
 799                 goto err_pci;
 800         }
 801
 802
 803
 804         attributes->type = VME_DMA_PCI;
 805         attributes->private = (void *)pci_attr;
 806
 807         pci_attr->address = address;
 808
 809         return attributes;
 810
 811         kfree(pci_attr);
 812 err_pci:
 813         kfree(attributes);
 814 err_attr:
 815         return NULL;
 816 }
 817 EXPORT_SYMBOL(vme_dma_pci_attribute);
 818
 819 /*
 820  * Create "VME" type attributes
 821  */
 822 struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address,
 823         vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth)
 824 {
 825         struct vme_dma_attr *attributes;
 826         struct vme_dma_vme *vme_attr;
 827
 828         /* XXX Run some sanity checks here */
 829
 830         attributes = (struct vme_dma_attr *)kmalloc(
 831                 sizeof(struct vme_dma_attr), GFP_KERNEL);
 832         if(attributes == NULL) {
 833                 printk("Unable to allocate memory for attributes structure\n");
 834                 goto err_attr;
 835         }
 836
 837         vme_attr = (struct vme_dma_vme *)kmalloc(sizeof(struct vme_dma_vme),
 838                 GFP_KERNEL);
 839         if(vme_attr == NULL) {
 840                 printk("Unable to allocate memory for vme attributes\n");
 841                 goto err_vme;
 842         }
 843
 844         attributes->type = VME_DMA_VME;
 845         attributes->private = (void *)vme_attr;
 846
 847         vme_attr->address = address;
 848         vme_attr->aspace = aspace;
 849         vme_attr->cycle = cycle;
 850         vme_attr->dwidth = dwidth;
 851
 852         return attributes;
 853
 854         kfree(vme_attr);
 855 err_vme:
 856         kfree(attributes);
 857 err_attr:
 858         return NULL;
 859 }
 860 EXPORT_SYMBOL(vme_dma_vme_attribute);
 861
 862 /*
 863  * Free attribute
 864  */
 865 void vme_dma_free_attribute(struct vme_dma_attr *attributes)
 866 {
 867         kfree(attributes->private);
 868         kfree(attributes);
 869 }
 870 EXPORT_SYMBOL(vme_dma_free_attribute);
 871
 872 int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
 873         struct vme_dma_attr *dest, size_t count)
 874 {
 875         struct vme_bridge *bridge = list->parent->parent;
 876         int retval;
 877
 878         if (bridge->dma_list_add == NULL) {
 879                 printk("Link List DMA generation not supported\n");
 880                 return -EINVAL;
 881         }
 882
 883         if (mutex_trylock(&(list->mtx))) {
 884                 printk("Link List already submitted\n");
 885                 return -EINVAL;
 886         }
 887
 888         retval = bridge->dma_list_add(list, src, dest, count);
 889
 890         mutex_unlock(&(list->mtx));
 891
 892         return retval;
 893 }
 894 EXPORT_SYMBOL(vme_dma_list_add);
 895
 896 int vme_dma_list_exec(struct vme_dma_list *list)
 897 {
 898         struct vme_bridge *bridge = list->parent->parent;
 899         int retval;
 900
 901         if (bridge->dma_list_exec == NULL) {
 902                 printk("Link List DMA execution not supported\n");
 903                 return -EINVAL;
 904         }
 905
 906         mutex_lock(&(list->mtx));
 907
 908         retval = bridge->dma_list_exec(list);
 909
 910         mutex_unlock(&(list->mtx));
 911
 912         return retval;
 913 }
 914 EXPORT_SYMBOL(vme_dma_list_exec);
 915
 916 int vme_dma_list_free(struct vme_dma_list *list)
 917 {
 918         struct vme_bridge *bridge = list->parent->parent;
 919         int retval;
 920
 921         if (bridge->dma_list_empty == NULL) {
 922                 printk("Emptying of Link Lists not supported\n");
 923                 return -EINVAL;
 924         }
 925
 926         if (mutex_trylock(&(list->mtx))) {
 927                 printk("Link List in use\n");
 928                 return -EINVAL;
 929         }
 930
 931         /*
 932          * Empty out all of the entries from the dma list. We need to go to the
 933          * low level driver as dma entries are driver specific.
 934          */
 935         retval = bridge->dma_list_empty(list);
 936         if (retval) {
 937                 printk("Unable to empty link-list entries\n");
 938                 mutex_unlock(&(list->mtx));
 939                 return retval;
 940         }
 941         mutex_unlock(&(list->mtx));
 942         kfree(list);
 943
 944         return retval;
 945 }
 946 EXPORT_SYMBOL(vme_dma_list_free);
 947
 948 int vme_dma_free(struct vme_resource *resource)
 949 {
 950         struct vme_dma_resource *ctrlr;
 951
 952         if (resource->type != VME_DMA) {
 953                 printk("Not a DMA resource\n");
 954                 return -EINVAL;
 955         }
 956
 957         ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
 958
 959         if (mutex_trylock(&(ctrlr->mtx))) {
 960                 printk("Resource busy, can't free\n");
 961                 return -EBUSY;
 962         }
 963
 964         if (!(list_empty(&(ctrlr->pending)) && list_empty(&(ctrlr->running)))) {
 965                 printk("Resource still processing transfers\n");
 966                 mutex_unlock(&(ctrlr->mtx));
 967                 return -EBUSY;
 968         }
 969
 970         ctrlr->locked = 0;
 971
 972         mutex_unlock(&(ctrlr->mtx));
 973
 974         return 0;
 975 }
 976 EXPORT_SYMBOL(vme_dma_free);
 977
 978 int vme_request_irq(struct device *dev, int level, int statid,
 979         void (*callback)(int level, int vector, void *priv_data),
 980         void *priv_data)
 981 {
 982         struct vme_bridge *bridge;
 983
 984         bridge = dev_to_bridge(dev);
 985         if (bridge == NULL) {
 986                 printk(KERN_ERR "Can't find VME bus\n");
 987                 return -EINVAL;
 988         }
 989
 990         if((level < 1) || (level > 7)) {
 991                 printk(KERN_WARNING "Invalid interrupt level\n");
 992                 return -EINVAL;
 993         }
 994
 995         if (bridge->request_irq == NULL) {
 996                 printk("Registering interrupts not supported\n");
 997                 return -EINVAL;
 998         }
 999
1000         return bridge->request_irq(level, statid, callback, priv_data);
1001 }
1002 EXPORT_SYMBOL(vme_request_irq);
1003
1004 void vme_free_irq(struct device *dev, int level, int statid)
1005 {
1006         struct vme_bridge *bridge;
1007
1008         bridge = dev_to_bridge(dev);
1009         if (bridge == NULL) {
1010                 printk(KERN_ERR "Can't find VME bus\n");
1011                 return;
1012         }
1013
1014         if((level < 1) || (level > 7)) {
1015                 printk(KERN_WARNING "Invalid interrupt level\n");
1016                 return;
1017         }
1018
1019         if (bridge->free_irq == NULL) {
1020                 printk("Freeing interrupts not supported\n");
1021                 return;
1022         }
1023
1024         bridge->free_irq(level, statid);
1025 }
1026 EXPORT_SYMBOL(vme_free_irq);
1027
1028 int vme_generate_irq(struct device *dev, int level, int statid)
1029 {
1030         struct vme_bridge *bridge;
1031
1032         bridge = dev_to_bridge(dev);
1033         if (bridge == NULL) {
1034                 printk(KERN_ERR "Can't find VME bus\n");
1035                 return -EINVAL;
1036         }
1037
1038         if((level < 1) || (level > 7)) {
1039                 printk(KERN_WARNING "Invalid interrupt level\n");
1040                 return -EINVAL;
1041         }
1042
1043         if (bridge->generate_irq == NULL) {
1044                 printk("Interrupt generation not supported\n");
1045                 return -EINVAL;
1046         }
1047
1048         return bridge->generate_irq(level, statid);
1049 }
1050 EXPORT_SYMBOL(vme_generate_irq);
1051
1052 /*
1053  * Request the location monitor, return resource or NULL
1054  */
1055 struct vme_resource *vme_lm_request(struct device *dev)
1056 {
1057         struct vme_bridge *bridge;
1058         struct list_head *lm_pos = NULL;
1059         struct vme_lm_resource *allocated_lm = NULL;
1060         struct vme_lm_resource *lm = NULL;
1061         struct vme_resource *resource = NULL;
1062
1063         bridge = dev_to_bridge(dev);
1064         if (bridge == NULL) {
1065                 printk(KERN_ERR "Can't find VME bus\n");
1066                 goto err_bus;
1067         }
1068
1069         /* Loop through DMA resources */
1070         list_for_each(lm_pos, &(bridge->lm_resources)) {
1071                 lm = list_entry(lm_pos,
1072                         struct vme_lm_resource, list);
1073
1074                 if (lm == NULL) {
1075                         printk(KERN_ERR "Registered NULL Location Monitor "
1076                                 "resource\n");
1077                         continue;
1078                 }
1079
1080                 /* Find an unlocked controller */
1081                 mutex_lock(&(lm->mtx));
1082                 if (lm->locked == 0) {
1083                         lm->locked = 1;
1084                         mutex_unlock(&(lm->mtx));
1085                         allocated_lm = lm;
1086                         break;
1087                 }
1088                 mutex_unlock(&(lm->mtx));
1089         }
1090
1091         /* Check to see if we found a resource */
1092         if (allocated_lm == NULL)
1093                 goto err_lm;
1094
1095         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
1096         if (resource == NULL) {
1097                 printk(KERN_ERR "Unable to allocate resource structure\n");
1098                 goto err_alloc;
1099         }
1100         resource->type = VME_LM;
1101         resource->entry = &(allocated_lm->list);
1102
1103         return resource;
1104
1105 err_alloc:
1106         /* Unlock image */
1107         mutex_lock(&(lm->mtx));
1108         lm->locked = 0;
1109         mutex_unlock(&(lm->mtx));
1110 err_lm:
1111 err_bus:
1112         return NULL;
1113 }
1114 EXPORT_SYMBOL(vme_lm_request);
1115
1116 int vme_lm_count(struct vme_resource *resource)
1117 {
1118         struct vme_lm_resource *lm;
1119
1120         if (resource->type != VME_LM) {
1121                 printk(KERN_ERR "Not a Location Monitor resource\n");
1122                 return -EINVAL;
1123         }
1124
1125         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1126
1127         return lm->monitors;
1128 }
1129 EXPORT_SYMBOL(vme_lm_count);
1130
1131 int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,
1132         vme_address_t aspace, vme_cycle_t cycle)
1133 {
1134         struct vme_bridge *bridge = find_bridge(resource);
1135         struct vme_lm_resource *lm;
1136
1137         if (resource->type != VME_LM) {
1138                 printk(KERN_ERR "Not a Location Monitor resource\n");
1139                 return -EINVAL;
1140         }
1141
1142         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1143
1144         if (bridge->lm_set == NULL) {
1145                 printk(KERN_ERR "vme_lm_set not supported\n");
1146                 return -EINVAL;
1147         }
1148
1149         /* XXX Check parameters */
1150
1151         return lm->parent->lm_set(lm, lm_base, aspace, cycle);
1152 }
1153 EXPORT_SYMBOL(vme_lm_set);
1154
1155 int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
1156         vme_address_t *aspace, vme_cycle_t *cycle)
1157 {
1158         struct vme_bridge *bridge = find_bridge(resource);
1159         struct vme_lm_resource *lm;
1160
1161         if (resource->type != VME_LM) {
1162                 printk(KERN_ERR "Not a Location Monitor resource\n");
1163                 return -EINVAL;
1164         }
1165
1166         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1167
1168         if (bridge->lm_get == NULL) {
1169                 printk(KERN_ERR "vme_lm_get not supported\n");
1170                 return -EINVAL;
1171         }
1172
1173         return bridge->lm_get(lm, lm_base, aspace, cycle);
1174 }
1175 EXPORT_SYMBOL(vme_lm_get);
1176
1177 int vme_lm_attach(struct vme_resource *resource, int monitor,
1178         void (*callback)(int))
1179 {
1180         struct vme_bridge *bridge = find_bridge(resource);
1181         struct vme_lm_resource *lm;
1182
1183         if (resource->type != VME_LM) {
1184                 printk(KERN_ERR "Not a Location Monitor resource\n");
1185                 return -EINVAL;
1186         }
1187
1188         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1189
1190         if (bridge->lm_attach == NULL) {
1191                 printk(KERN_ERR "vme_lm_attach not supported\n");
1192                 return -EINVAL;
1193         }
1194
1195         return bridge->lm_attach(lm, monitor, callback);
1196 }
1197 EXPORT_SYMBOL(vme_lm_attach);
1198
1199 int vme_lm_detach(struct vme_resource *resource, int monitor)
1200 {
1201         struct vme_bridge *bridge = find_bridge(resource);
1202         struct vme_lm_resource *lm;
1203
1204         if (resource->type != VME_LM) {
1205                 printk(KERN_ERR "Not a Location Monitor resource\n");
1206                 return -EINVAL;
1207         }
1208
1209         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1210
1211         if (bridge->lm_detach == NULL) {
1212                 printk(KERN_ERR "vme_lm_detach not supported\n");
1213                 return -EINVAL;
1214         }
1215
1216         return bridge->lm_detach(lm, monitor);
1217 }
1218 EXPORT_SYMBOL(vme_lm_detach);
1219
1220 void vme_lm_free(struct vme_resource *resource)
1221 {
1222         struct vme_lm_resource *lm;
1223
1224         if (resource->type != VME_LM) {
1225                 printk(KERN_ERR "Not a Location Monitor resource\n");
1226                 return;
1227         }
1228
1229         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1230
1231         if (mutex_trylock(&(lm->mtx))) {
1232                 printk(KERN_ERR "Resource busy, can't free\n");
1233                 return;
1234         }
1235
1236         /* XXX Check to see that there aren't any callbacks still attached */
1237
1238         lm->locked = 0;
1239
1240         mutex_unlock(&(lm->mtx));
1241 }
1242 EXPORT_SYMBOL(vme_lm_free);
1243
1244 int vme_slot_get(struct device *bus)
1245 {
1246         struct vme_bridge *bridge;
1247
1248         bridge = dev_to_bridge(bus);
1249         if (bridge == NULL) {
1250                 printk(KERN_ERR "Can't find VME bus\n");
1251                 return -EINVAL;
1252         }
1253
1254         if (bridge->slot_get == NULL) {
1255                 printk("vme_slot_get not supported\n");
1256                 return -EINVAL;
1257         }
1258
1259         return bridge->slot_get();
1260 }
1261 EXPORT_SYMBOL(vme_slot_get);
1262
1263
1264 /* - Bridge Registration --------------------------------------------------- */
1265
1266 static int vme_alloc_bus_num(void)
1267 {
1268         int i;
1269
1270         mutex_lock(&vme_bus_num_mtx);
1271         for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
1272                 if (((vme_bus_numbers >> i) & 0x1) == 0) {
1273                         vme_bus_numbers |= (0x1 << i);
1274                         break;
1275                 }
1276         }
1277         mutex_unlock(&vme_bus_num_mtx);
1278
1279         return i;
1280 }
1281
1282 static void vme_free_bus_num(int bus)
1283 {
1284         mutex_lock(&vme_bus_num_mtx);
1285         vme_bus_numbers |= ~(0x1 << bus);
1286         mutex_unlock(&vme_bus_num_mtx);
1287 }
1288
1289 int vme_register_bridge (struct vme_bridge *bridge)
1290 {
1291         struct device *dev;
1292         int retval;
1293         int i;
1294
1295         bridge->num = vme_alloc_bus_num();
1296
1297         /* This creates 32 vme "slot" devices. This equates to a slot for each
1298          * ID available in a system conforming to the ANSI/VITA 1-1994
1299          * specification.
1300          */
1301         for (i = 0; i < VME_SLOTS_MAX; i++) {
1302                 dev = &(bridge->dev[i]);
1303                 memset(dev, 0, sizeof(struct device));
1304
1305                 dev->parent = bridge->parent;
1306                 dev->bus = &(vme_bus_type);
1307                 /*
1308                  * We save a pointer to the bridge in platform_data so that we
1309                  * can get to it later. We keep driver_data for use by the
1310                  * driver that binds against the slot
1311                  */
1312                 dev->platform_data = bridge;
1313                 dev_set_name(dev, "vme-%x.%x", bridge->num, i + 1);
1314
1315                 retval = device_register(dev);
1316                 if(retval)
1317                         goto err_reg;
1318         }
1319
1320         return retval;
1321
1322         i = VME_SLOTS_MAX;
1323 err_reg:
1324         while (i > -1) {
1325                 dev = &(bridge->dev[i]);
1326                 device_unregister(dev);
1327         }
1328         vme_free_bus_num(bridge->num);
1329         return retval;
1330 }
1331 EXPORT_SYMBOL(vme_register_bridge);
1332
1333 void vme_unregister_bridge (struct vme_bridge *bridge)
1334 {
1335         int i;
1336         struct device *dev;
1337
1338
1339         for (i = 0; i < VME_SLOTS_MAX; i++) {
1340                 dev = &(bridge->dev[i]);
1341                 device_unregister(dev);
1342         }
1343         vme_free_bus_num(bridge->num);
1344 }
1345 EXPORT_SYMBOL(vme_unregister_bridge);
1346
1347
1348 /* - Driver Registration --------------------------------------------------- */
1349
1350 int vme_register_driver (struct vme_driver *drv)
1351 {
1352         drv->driver.name = drv->name;
1353         drv->driver.bus = &vme_bus_type;
1354
1355         return driver_register(&drv->driver);
1356 }
1357 EXPORT_SYMBOL(vme_register_driver);
1358
1359 void vme_unregister_driver (struct vme_driver *drv)
1360 {
1361         driver_unregister(&drv->driver);
1362 }
1363 EXPORT_SYMBOL(vme_unregister_driver);
1364
1365 /* - Bus Registration ------------------------------------------------------ */
1366
1367 int vme_calc_slot(struct device *dev)
1368 {
1369         struct vme_bridge *bridge;
1370         int num;
1371
1372         bridge = dev_to_bridge(dev);
1373
1374         /* Determine slot number */
1375         num = 0;
1376         while(num < VME_SLOTS_MAX) {
1377                 if(&(bridge->dev[num]) == dev) {
1378                         break;
1379                 }
1380                 num++;
1381         }
1382         if (num == VME_SLOTS_MAX) {
1383                 dev_err(dev, "Failed to identify slot\n");
1384                 num = 0;
1385                 goto err_dev;
1386         }
1387         num++;
1388
1389 err_dev:
1390         return num;
1391 }
1392
1393 static struct vme_driver *dev_to_vme_driver(struct device *dev)
1394 {
1395         if(dev->driver == NULL)
1396                 printk("Bugger dev->driver is NULL\n");
1397
1398         return container_of(dev->driver, struct vme_driver, driver);
1399 }
1400
1401 static int vme_bus_match(struct device *dev, struct device_driver *drv)
1402 {
1403         struct vme_bridge *bridge;
1404         struct vme_driver *driver;
1405         int i, num;
1406
1407         bridge = dev_to_bridge(dev);
1408         driver = container_of(drv, struct vme_driver, driver);
1409
1410         num = vme_calc_slot(dev);
1411         if (!num)
1412                 goto err_dev;
1413
1414         if (driver->bind_table == NULL) {
1415                 dev_err(dev, "Bind table NULL\n");
1416                 goto err_table;
1417         }
1418
1419         i = 0;
1420         while((driver->bind_table[i].bus != 0) ||
1421                 (driver->bind_table[i].slot != 0)) {
1422
1423                 if (bridge->num == driver->bind_table[i].bus) {
1424                         if (num == driver->bind_table[i].slot)
1425                                 return 1;
1426
1427                         if (driver->bind_table[i].slot == VME_SLOT_ALL)
1428                                 return 1;
1429
1430                         if ((driver->bind_table[i].slot == VME_SLOT_CURRENT) &&
1431                                 (num == vme_slot_get(dev)))
1432                                 return 1;
1433                 }
1434                 i++;
1435         }
1436
1437 err_dev:
1438 err_table:
1439         return 0;
1440 }
1441
1442 static int vme_bus_probe(struct device *dev)
1443 {
1444         struct vme_bridge *bridge;
1445         struct vme_driver *driver;
1446         int retval = -ENODEV;
1447
1448         driver = dev_to_vme_driver(dev);
1449         bridge = dev_to_bridge(dev);
1450
1451         if(driver->probe != NULL) {
1452                 retval = driver->probe(dev, bridge->num, vme_calc_slot(dev));
1453         }
1454
1455         return retval;
1456 }
1457
1458 static int vme_bus_remove(struct device *dev)
1459 {
1460         struct vme_bridge *bridge;
1461         struct vme_driver *driver;
1462         int retval = -ENODEV;
1463
1464         driver = dev_to_vme_driver(dev);
1465         bridge = dev_to_bridge(dev);
1466
1467         if(driver->remove != NULL) {
1468                 retval = driver->remove(dev, bridge->num, vme_calc_slot(dev));
1469         }
1470
1471         return retval;
1472 }
1473
1474 struct bus_type vme_bus_type = {
1475         .name = "vme",
1476         .match = vme_bus_match,
1477         .probe = vme_bus_probe,
1478         .remove = vme_bus_remove,
1479 };
1480 EXPORT_SYMBOL(vme_bus_type);
1481
1482 static int __init vme_init (void)
1483 {
1484         return bus_register(&vme_bus_type);
1485 }
1486
1487 static void __exit vme_exit (void)
1488 {
1489         bus_unregister(&vme_bus_type);
1490 }
1491
1492 MODULE_DESCRIPTION("VME bridge driver framework");
1493 MODULE_AUTHOR("Martyn Welch <martyn.welch@gefanuc.com");
1494 MODULE_LICENSE("GPL");
1495
1496 module_init(vme_init);
1497 module_exit(vme_exit);