drivers/vme/vme.c

   1 /*
   2  * VME Bridge Framework
   3  *
   4  * Author: Martyn Welch <martyn.welch@ge.com>
   5  * Copyright 2008 GE 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/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/mm.h>
  19 #include <linux/types.h>
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/pci.h>
  23 #include <linux/poll.h>
  24 #include <linux/highmem.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/pagemap.h>
  27 #include <linux/device.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/syscalls.h>
  30 #include <linux/mutex.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/slab.h>
  33 #include <linux/vme.h>
  34
  35 #include "vme_bridge.h"
  36
  37 /* Bitmask and list of registered buses both protected by common mutex */
  38 static unsigned int vme_bus_numbers;
  39 static LIST_HEAD(vme_bus_list);
  40 static DEFINE_MUTEX(vme_buses_lock);
  41
  42 static void __exit vme_exit(void);
  43 static int __init vme_init(void);
  44
  45 static struct vme_dev *dev_to_vme_dev(struct device *dev)
  46 {
  47         return container_of(dev, struct vme_dev, dev);
  48 }
  49
  50 /*
  51  * Find the bridge that the resource is associated with.
  52  */
  53 static struct vme_bridge *find_bridge(struct vme_resource *resource)
  54 {
  55         /* Get list to search */
  56         switch (resource->type) {
  57         case VME_MASTER:
  58                 return list_entry(resource->entry, struct vme_master_resource,
  59                         list)->parent;
  60                 break;
  61         case VME_SLAVE:
  62                 return list_entry(resource->entry, struct vme_slave_resource,
  63                         list)->parent;
  64                 break;
  65         case VME_DMA:
  66                 return list_entry(resource->entry, struct vme_dma_resource,
  67                         list)->parent;
  68                 break;
  69         case VME_LM:
  70                 return list_entry(resource->entry, struct vme_lm_resource,
  71                         list)->parent;
  72                 break;
  73         default:
  74                 printk(KERN_ERR "Unknown resource type\n");
  75                 return NULL;
  76                 break;
  77         }
  78 }
  79
  80 /*
  81  * Allocate a contiguous block of memory for use by the driver. This is used to
  82  * create the buffers for the slave windows.
  83  */
  84 void *vme_alloc_consistent(struct vme_resource *resource, size_t size,
  85         dma_addr_t *dma)
  86 {
  87         struct vme_bridge *bridge;
  88
  89         if (resource == NULL) {
  90                 printk(KERN_ERR "No resource\n");
  91                 return NULL;
  92         }
  93
  94         bridge = find_bridge(resource);
  95         if (bridge == NULL) {
  96                 printk(KERN_ERR "Can't find bridge\n");
  97                 return NULL;
  98         }
  99
 100         if (bridge->parent == NULL) {
 101                 printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
 102                 return NULL;
 103         }
 104
 105         if (bridge->alloc_consistent == NULL) {
 106                 printk(KERN_ERR "alloc_consistent not supported by bridge %s\n",
 107                        bridge->name);
 108                 return NULL;
 109         }
 110
 111         return bridge->alloc_consistent(bridge->parent, size, dma);
 112 }
 113 EXPORT_SYMBOL(vme_alloc_consistent);
 114
 115 /*
 116  * Free previously allocated contiguous block of memory.
 117  */
 118 void vme_free_consistent(struct vme_resource *resource, size_t size,
 119         void *vaddr, dma_addr_t dma)
 120 {
 121         struct vme_bridge *bridge;
 122
 123         if (resource == NULL) {
 124                 printk(KERN_ERR "No resource\n");
 125                 return;
 126         }
 127
 128         bridge = find_bridge(resource);
 129         if (bridge == NULL) {
 130                 printk(KERN_ERR "Can't find bridge\n");
 131                 return;
 132         }
 133
 134         if (bridge->parent == NULL) {
 135                 printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
 136                 return;
 137         }
 138
 139         if (bridge->free_consistent == NULL) {
 140                 printk(KERN_ERR "free_consistent not supported by bridge %s\n",
 141                        bridge->name);
 142                 return;
 143         }
 144
 145         bridge->free_consistent(bridge->parent, size, vaddr, dma);
 146 }
 147 EXPORT_SYMBOL(vme_free_consistent);
 148
 149 size_t vme_get_size(struct vme_resource *resource)
 150 {
 151         int enabled, retval;
 152         unsigned long long base, size;
 153         dma_addr_t buf_base;
 154         u32 aspace, cycle, dwidth;
 155
 156         switch (resource->type) {
 157         case VME_MASTER:
 158                 retval = vme_master_get(resource, &enabled, &base, &size,
 159                         &aspace, &cycle, &dwidth);
 160
 161                 return size;
 162                 break;
 163         case VME_SLAVE:
 164                 retval = vme_slave_get(resource, &enabled, &base, &size,
 165                         &buf_base, &aspace, &cycle);
 166
 167                 return size;
 168                 break;
 169         case VME_DMA:
 170                 return 0;
 171                 break;
 172         default:
 173                 printk(KERN_ERR "Unknown resource type\n");
 174                 return 0;
 175                 break;
 176         }
 177 }
 178 EXPORT_SYMBOL(vme_get_size);
 179
 180 static int vme_check_window(u32 aspace, unsigned long long vme_base,
 181         unsigned long long size)
 182 {
 183         int retval = 0;
 184
 185         switch (aspace) {
 186         case VME_A16:
 187                 if (((vme_base + size) > VME_A16_MAX) ||
 188                                 (vme_base > VME_A16_MAX))
 189                         retval = -EFAULT;
 190                 break;
 191         case VME_A24:
 192                 if (((vme_base + size) > VME_A24_MAX) ||
 193                                 (vme_base > VME_A24_MAX))
 194                         retval = -EFAULT;
 195                 break;
 196         case VME_A32:
 197                 if (((vme_base + size) > VME_A32_MAX) ||
 198                                 (vme_base > VME_A32_MAX))
 199                         retval = -EFAULT;
 200                 break;
 201         case VME_A64:
 202                 /*
 203                  * Any value held in an unsigned long long can be used as the
 204                  * base
 205                  */
 206                 break;
 207         case VME_CRCSR:
 208                 if (((vme_base + size) > VME_CRCSR_MAX) ||
 209                                 (vme_base > VME_CRCSR_MAX))
 210                         retval = -EFAULT;
 211                 break;
 212         case VME_USER1:
 213         case VME_USER2:
 214         case VME_USER3:
 215         case VME_USER4:
 216                 /* User Defined */
 217                 break;
 218         default:
 219                 printk(KERN_ERR "Invalid address space\n");
 220                 retval = -EINVAL;
 221                 break;
 222         }
 223
 224         return retval;
 225 }
 226
 227 /*
 228  * Request a slave image with specific attributes, return some unique
 229  * identifier.
 230  */
 231 struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
 232         u32 cycle)
 233 {
 234         struct vme_bridge *bridge;
 235         struct list_head *slave_pos = NULL;
 236         struct vme_slave_resource *allocated_image = NULL;
 237         struct vme_slave_resource *slave_image = NULL;
 238         struct vme_resource *resource = NULL;
 239
 240         bridge = vdev->bridge;
 241         if (bridge == NULL) {
 242                 printk(KERN_ERR "Can't find VME bus\n");
 243                 goto err_bus;
 244         }
 245
 246         /* Loop through slave resources */
 247         list_for_each(slave_pos, &bridge->slave_resources) {
 248                 slave_image = list_entry(slave_pos,
 249                         struct vme_slave_resource, list);
 250
 251                 if (slave_image == NULL) {
 252                         printk(KERN_ERR "Registered NULL Slave resource\n");
 253                         continue;
 254                 }
 255
 256                 /* Find an unlocked and compatible image */
 257                 mutex_lock(&slave_image->mtx);
 258                 if (((slave_image->address_attr & address) == address) &&
 259                         ((slave_image->cycle_attr & cycle) == cycle) &&
 260                         (slave_image->locked == 0)) {
 261
 262                         slave_image->locked = 1;
 263                         mutex_unlock(&slave_image->mtx);
 264                         allocated_image = slave_image;
 265                         break;
 266                 }
 267                 mutex_unlock(&slave_image->mtx);
 268         }
 269
 270         /* No free image */
 271         if (allocated_image == NULL)
 272                 goto err_image;
 273
 274         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 275         if (resource == NULL) {
 276                 printk(KERN_WARNING "Unable to allocate resource structure\n");
 277                 goto err_alloc;
 278         }
 279         resource->type = VME_SLAVE;
 280         resource->entry = &allocated_image->list;
 281
 282         return resource;
 283
 284 err_alloc:
 285         /* Unlock image */
 286         mutex_lock(&slave_image->mtx);
 287         slave_image->locked = 0;
 288         mutex_unlock(&slave_image->mtx);
 289 err_image:
 290 err_bus:
 291         return NULL;
 292 }
 293 EXPORT_SYMBOL(vme_slave_request);
 294
 295 int vme_slave_set(struct vme_resource *resource, int enabled,
 296         unsigned long long vme_base, unsigned long long size,
 297         dma_addr_t buf_base, u32 aspace, u32 cycle)
 298 {
 299         struct vme_bridge *bridge = find_bridge(resource);
 300         struct vme_slave_resource *image;
 301         int retval;
 302
 303         if (resource->type != VME_SLAVE) {
 304                 printk(KERN_ERR "Not a slave resource\n");
 305                 return -EINVAL;
 306         }
 307
 308         image = list_entry(resource->entry, struct vme_slave_resource, list);
 309
 310         if (bridge->slave_set == NULL) {
 311                 printk(KERN_ERR "Function not supported\n");
 312                 return -ENOSYS;
 313         }
 314
 315         if (!(((image->address_attr & aspace) == aspace) &&
 316                 ((image->cycle_attr & cycle) == cycle))) {
 317                 printk(KERN_ERR "Invalid attributes\n");
 318                 return -EINVAL;
 319         }
 320
 321         retval = vme_check_window(aspace, vme_base, size);
 322         if (retval)
 323                 return retval;
 324
 325         return bridge->slave_set(image, enabled, vme_base, size, buf_base,
 326                 aspace, cycle);
 327 }
 328 EXPORT_SYMBOL(vme_slave_set);
 329
 330 int vme_slave_get(struct vme_resource *resource, int *enabled,
 331         unsigned long long *vme_base, unsigned long long *size,
 332         dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
 333 {
 334         struct vme_bridge *bridge = find_bridge(resource);
 335         struct vme_slave_resource *image;
 336
 337         if (resource->type != VME_SLAVE) {
 338                 printk(KERN_ERR "Not a slave resource\n");
 339                 return -EINVAL;
 340         }
 341
 342         image = list_entry(resource->entry, struct vme_slave_resource, list);
 343
 344         if (bridge->slave_get == NULL) {
 345                 printk(KERN_ERR "vme_slave_get not supported\n");
 346                 return -EINVAL;
 347         }
 348
 349         return bridge->slave_get(image, enabled, vme_base, size, buf_base,
 350                 aspace, cycle);
 351 }
 352 EXPORT_SYMBOL(vme_slave_get);
 353
 354 void vme_slave_free(struct vme_resource *resource)
 355 {
 356         struct vme_slave_resource *slave_image;
 357
 358         if (resource->type != VME_SLAVE) {
 359                 printk(KERN_ERR "Not a slave resource\n");
 360                 return;
 361         }
 362
 363         slave_image = list_entry(resource->entry, struct vme_slave_resource,
 364                 list);
 365         if (slave_image == NULL) {
 366                 printk(KERN_ERR "Can't find slave resource\n");
 367                 return;
 368         }
 369
 370         /* Unlock image */
 371         mutex_lock(&slave_image->mtx);
 372         if (slave_image->locked == 0)
 373                 printk(KERN_ERR "Image is already free\n");
 374
 375         slave_image->locked = 0;
 376         mutex_unlock(&slave_image->mtx);
 377
 378         /* Free up resource memory */
 379         kfree(resource);
 380 }
 381 EXPORT_SYMBOL(vme_slave_free);
 382
 383 /*
 384  * Request a master image with specific attributes, return some unique
 385  * identifier.
 386  */
 387 struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
 388         u32 cycle, u32 dwidth)
 389 {
 390         struct vme_bridge *bridge;
 391         struct list_head *master_pos = NULL;
 392         struct vme_master_resource *allocated_image = NULL;
 393         struct vme_master_resource *master_image = NULL;
 394         struct vme_resource *resource = NULL;
 395
 396         bridge = vdev->bridge;
 397         if (bridge == NULL) {
 398                 printk(KERN_ERR "Can't find VME bus\n");
 399                 goto err_bus;
 400         }
 401
 402         /* Loop through master resources */
 403         list_for_each(master_pos, &bridge->master_resources) {
 404                 master_image = list_entry(master_pos,
 405                         struct vme_master_resource, list);
 406
 407                 if (master_image == NULL) {
 408                         printk(KERN_WARNING "Registered NULL master resource\n");
 409                         continue;
 410                 }
 411
 412                 /* Find an unlocked and compatible image */
 413                 spin_lock(&master_image->lock);
 414                 if (((master_image->address_attr & address) == address) &&
 415                         ((master_image->cycle_attr & cycle) == cycle) &&
 416                         ((master_image->width_attr & dwidth) == dwidth) &&
 417                         (master_image->locked == 0)) {
 418
 419                         master_image->locked = 1;
 420                         spin_unlock(&master_image->lock);
 421                         allocated_image = master_image;
 422                         break;
 423                 }
 424                 spin_unlock(&master_image->lock);
 425         }
 426
 427         /* Check to see if we found a resource */
 428         if (allocated_image == NULL) {
 429                 printk(KERN_ERR "Can't find a suitable resource\n");
 430                 goto err_image;
 431         }
 432
 433         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 434         if (resource == NULL) {
 435                 printk(KERN_ERR "Unable to allocate resource structure\n");
 436                 goto err_alloc;
 437         }
 438         resource->type = VME_MASTER;
 439         resource->entry = &allocated_image->list;
 440
 441         return resource;
 442
 443 err_alloc:
 444         /* Unlock image */
 445         spin_lock(&master_image->lock);
 446         master_image->locked = 0;
 447         spin_unlock(&master_image->lock);
 448 err_image:
 449 err_bus:
 450         return NULL;
 451 }
 452 EXPORT_SYMBOL(vme_master_request);
 453
 454 int vme_master_set(struct vme_resource *resource, int enabled,
 455         unsigned long long vme_base, unsigned long long size, u32 aspace,
 456         u32 cycle, u32 dwidth)
 457 {
 458         struct vme_bridge *bridge = find_bridge(resource);
 459         struct vme_master_resource *image;
 460         int retval;
 461
 462         if (resource->type != VME_MASTER) {
 463                 printk(KERN_ERR "Not a master resource\n");
 464                 return -EINVAL;
 465         }
 466
 467         image = list_entry(resource->entry, struct vme_master_resource, list);
 468
 469         if (bridge->master_set == NULL) {
 470                 printk(KERN_WARNING "vme_master_set not supported\n");
 471                 return -EINVAL;
 472         }
 473
 474         if (!(((image->address_attr & aspace) == aspace) &&
 475                 ((image->cycle_attr & cycle) == cycle) &&
 476                 ((image->width_attr & dwidth) == dwidth))) {
 477                 printk(KERN_WARNING "Invalid attributes\n");
 478                 return -EINVAL;
 479         }
 480
 481         retval = vme_check_window(aspace, vme_base, size);
 482         if (retval)
 483                 return retval;
 484
 485         return bridge->master_set(image, enabled, vme_base, size, aspace,
 486                 cycle, dwidth);
 487 }
 488 EXPORT_SYMBOL(vme_master_set);
 489
 490 int vme_master_get(struct vme_resource *resource, int *enabled,
 491         unsigned long long *vme_base, unsigned long long *size, u32 *aspace,
 492         u32 *cycle, u32 *dwidth)
 493 {
 494         struct vme_bridge *bridge = find_bridge(resource);
 495         struct vme_master_resource *image;
 496
 497         if (resource->type != VME_MASTER) {
 498                 printk(KERN_ERR "Not a master resource\n");
 499                 return -EINVAL;
 500         }
 501
 502         image = list_entry(resource->entry, struct vme_master_resource, list);
 503
 504         if (bridge->master_get == NULL) {
 505                 printk(KERN_WARNING "vme_master_set not supported\n");
 506                 return -EINVAL;
 507         }
 508
 509         return bridge->master_get(image, enabled, vme_base, size, aspace,
 510                 cycle, dwidth);
 511 }
 512 EXPORT_SYMBOL(vme_master_get);
 513
 514 /*
 515  * Read data out of VME space into a buffer.
 516  */
 517 ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count,
 518         loff_t offset)
 519 {
 520         struct vme_bridge *bridge = find_bridge(resource);
 521         struct vme_master_resource *image;
 522         size_t length;
 523
 524         if (bridge->master_read == NULL) {
 525                 printk(KERN_WARNING "Reading from resource not supported\n");
 526                 return -EINVAL;
 527         }
 528
 529         if (resource->type != VME_MASTER) {
 530                 printk(KERN_ERR "Not a master resource\n");
 531                 return -EINVAL;
 532         }
 533
 534         image = list_entry(resource->entry, struct vme_master_resource, list);
 535
 536         length = vme_get_size(resource);
 537
 538         if (offset > length) {
 539                 printk(KERN_WARNING "Invalid Offset\n");
 540                 return -EFAULT;
 541         }
 542
 543         if ((offset + count) > length)
 544                 count = length - offset;
 545
 546         return bridge->master_read(image, buf, count, offset);
 547
 548 }
 549 EXPORT_SYMBOL(vme_master_read);
 550
 551 /*
 552  * Write data out to VME space from a buffer.
 553  */
 554 ssize_t vme_master_write(struct vme_resource *resource, void *buf,
 555         size_t count, loff_t offset)
 556 {
 557         struct vme_bridge *bridge = find_bridge(resource);
 558         struct vme_master_resource *image;
 559         size_t length;
 560
 561         if (bridge->master_write == NULL) {
 562                 printk(KERN_WARNING "Writing to resource not supported\n");
 563                 return -EINVAL;
 564         }
 565
 566         if (resource->type != VME_MASTER) {
 567                 printk(KERN_ERR "Not a master resource\n");
 568                 return -EINVAL;
 569         }
 570
 571         image = list_entry(resource->entry, struct vme_master_resource, list);
 572
 573         length = vme_get_size(resource);
 574
 575         if (offset > length) {
 576                 printk(KERN_WARNING "Invalid Offset\n");
 577                 return -EFAULT;
 578         }
 579
 580         if ((offset + count) > length)
 581                 count = length - offset;
 582
 583         return bridge->master_write(image, buf, count, offset);
 584 }
 585 EXPORT_SYMBOL(vme_master_write);
 586
 587 /*
 588  * Perform RMW cycle to provided location.
 589  */
 590 unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
 591         unsigned int compare, unsigned int swap, loff_t offset)
 592 {
 593         struct vme_bridge *bridge = find_bridge(resource);
 594         struct vme_master_resource *image;
 595
 596         if (bridge->master_rmw == NULL) {
 597                 printk(KERN_WARNING "Writing to resource not supported\n");
 598                 return -EINVAL;
 599         }
 600
 601         if (resource->type != VME_MASTER) {
 602                 printk(KERN_ERR "Not a master resource\n");
 603                 return -EINVAL;
 604         }
 605
 606         image = list_entry(resource->entry, struct vme_master_resource, list);
 607
 608         return bridge->master_rmw(image, mask, compare, swap, offset);
 609 }
 610 EXPORT_SYMBOL(vme_master_rmw);
 611
 612 void vme_master_free(struct vme_resource *resource)
 613 {
 614         struct vme_master_resource *master_image;
 615
 616         if (resource->type != VME_MASTER) {
 617                 printk(KERN_ERR "Not a master resource\n");
 618                 return;
 619         }
 620
 621         master_image = list_entry(resource->entry, struct vme_master_resource,
 622                 list);
 623         if (master_image == NULL) {
 624                 printk(KERN_ERR "Can't find master resource\n");
 625                 return;
 626         }
 627
 628         /* Unlock image */
 629         spin_lock(&master_image->lock);
 630         if (master_image->locked == 0)
 631                 printk(KERN_ERR "Image is already free\n");
 632
 633         master_image->locked = 0;
 634         spin_unlock(&master_image->lock);
 635
 636         /* Free up resource memory */
 637         kfree(resource);
 638 }
 639 EXPORT_SYMBOL(vme_master_free);
 640
 641 /*
 642  * Request a DMA controller with specific attributes, return some unique
 643  * identifier.
 644  */
 645 struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
 646 {
 647         struct vme_bridge *bridge;
 648         struct list_head *dma_pos = NULL;
 649         struct vme_dma_resource *allocated_ctrlr = NULL;
 650         struct vme_dma_resource *dma_ctrlr = NULL;
 651         struct vme_resource *resource = NULL;
 652
 653         /* XXX Not checking resource attributes */
 654         printk(KERN_ERR "No VME resource Attribute tests done\n");
 655
 656         bridge = vdev->bridge;
 657         if (bridge == NULL) {
 658                 printk(KERN_ERR "Can't find VME bus\n");
 659                 goto err_bus;
 660         }
 661
 662         /* Loop through DMA resources */
 663         list_for_each(dma_pos, &bridge->dma_resources) {
 664                 dma_ctrlr = list_entry(dma_pos,
 665                         struct vme_dma_resource, list);
 666
 667                 if (dma_ctrlr == NULL) {
 668                         printk(KERN_ERR "Registered NULL DMA resource\n");
 669                         continue;
 670                 }
 671
 672                 /* Find an unlocked and compatible controller */
 673                 mutex_lock(&dma_ctrlr->mtx);
 674                 if (((dma_ctrlr->route_attr & route) == route) &&
 675                         (dma_ctrlr->locked == 0)) {
 676
 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_dma_request);
 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(KERN_ERR "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 = kmalloc(sizeof(struct vme_dma_list), GFP_KERNEL);
 726         if (dma_list == NULL) {
 727                 printk(KERN_ERR "Unable to allocate memory for new dma list\n");
 728                 return NULL;
 729         }
 730         INIT_LIST_HEAD(&dma_list->entries);
 731         dma_list->parent = ctrlr;
 732         mutex_init(&dma_list->mtx);
 733
 734         return dma_list;
 735 }
 736 EXPORT_SYMBOL(vme_new_dma_list);
 737
 738 /*
 739  * Create "Pattern" type attributes
 740  */
 741 struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, u32 type)
 742 {
 743         struct vme_dma_attr *attributes;
 744         struct vme_dma_pattern *pattern_attr;
 745
 746         attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
 747         if (attributes == NULL) {
 748                 printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
 749                 goto err_attr;
 750         }
 751
 752         pattern_attr = kmalloc(sizeof(struct vme_dma_pattern), GFP_KERNEL);
 753         if (pattern_attr == NULL) {
 754                 printk(KERN_ERR "Unable to allocate memory for pattern attributes\n");
 755                 goto err_pat;
 756         }
 757
 758         attributes->type = VME_DMA_PATTERN;
 759         attributes->private = (void *)pattern_attr;
 760
 761         pattern_attr->pattern = pattern;
 762         pattern_attr->type = type;
 763
 764         return attributes;
 765
 766 err_pat:
 767         kfree(attributes);
 768 err_attr:
 769         return NULL;
 770 }
 771 EXPORT_SYMBOL(vme_dma_pattern_attribute);
 772
 773 /*
 774  * Create "PCI" type attributes
 775  */
 776 struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address)
 777 {
 778         struct vme_dma_attr *attributes;
 779         struct vme_dma_pci *pci_attr;
 780
 781         /* XXX Run some sanity checks here */
 782
 783         attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
 784         if (attributes == NULL) {
 785                 printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
 786                 goto err_attr;
 787         }
 788
 789         pci_attr = kmalloc(sizeof(struct vme_dma_pci), GFP_KERNEL);
 790         if (pci_attr == NULL) {
 791                 printk(KERN_ERR "Unable to allocate memory for pci attributes\n");
 792                 goto err_pci;
 793         }
 794
 795
 796
 797         attributes->type = VME_DMA_PCI;
 798         attributes->private = (void *)pci_attr;
 799
 800         pci_attr->address = address;
 801
 802         return attributes;
 803
 804 err_pci:
 805         kfree(attributes);
 806 err_attr:
 807         return NULL;
 808 }
 809 EXPORT_SYMBOL(vme_dma_pci_attribute);
 810
 811 /*
 812  * Create "VME" type attributes
 813  */
 814 struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address,
 815         u32 aspace, u32 cycle, u32 dwidth)
 816 {
 817         struct vme_dma_attr *attributes;
 818         struct vme_dma_vme *vme_attr;
 819
 820         attributes = kmalloc(
 821                 sizeof(struct vme_dma_attr), GFP_KERNEL);
 822         if (attributes == NULL) {
 823                 printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
 824                 goto err_attr;
 825         }
 826
 827         vme_attr = kmalloc(sizeof(struct vme_dma_vme), GFP_KERNEL);
 828         if (vme_attr == NULL) {
 829                 printk(KERN_ERR "Unable to allocate memory for vme attributes\n");
 830                 goto err_vme;
 831         }
 832
 833         attributes->type = VME_DMA_VME;
 834         attributes->private = (void *)vme_attr;
 835
 836         vme_attr->address = address;
 837         vme_attr->aspace = aspace;
 838         vme_attr->cycle = cycle;
 839         vme_attr->dwidth = dwidth;
 840
 841         return attributes;
 842
 843 err_vme:
 844         kfree(attributes);
 845 err_attr:
 846         return NULL;
 847 }
 848 EXPORT_SYMBOL(vme_dma_vme_attribute);
 849
 850 /*
 851  * Free attribute
 852  */
 853 void vme_dma_free_attribute(struct vme_dma_attr *attributes)
 854 {
 855         kfree(attributes->private);
 856         kfree(attributes);
 857 }
 858 EXPORT_SYMBOL(vme_dma_free_attribute);
 859
 860 int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
 861         struct vme_dma_attr *dest, size_t count)
 862 {
 863         struct vme_bridge *bridge = list->parent->parent;
 864         int retval;
 865
 866         if (bridge->dma_list_add == NULL) {
 867                 printk(KERN_WARNING "Link List DMA generation not supported\n");
 868                 return -EINVAL;
 869         }
 870
 871         if (!mutex_trylock(&list->mtx)) {
 872                 printk(KERN_ERR "Link List already submitted\n");
 873                 return -EINVAL;
 874         }
 875
 876         retval = bridge->dma_list_add(list, src, dest, count);
 877
 878         mutex_unlock(&list->mtx);
 879
 880         return retval;
 881 }
 882 EXPORT_SYMBOL(vme_dma_list_add);
 883
 884 int vme_dma_list_exec(struct vme_dma_list *list)
 885 {
 886         struct vme_bridge *bridge = list->parent->parent;
 887         int retval;
 888
 889         if (bridge->dma_list_exec == NULL) {
 890                 printk(KERN_ERR "Link List DMA execution not supported\n");
 891                 return -EINVAL;
 892         }
 893
 894         mutex_lock(&list->mtx);
 895
 896         retval = bridge->dma_list_exec(list);
 897
 898         mutex_unlock(&list->mtx);
 899
 900         return retval;
 901 }
 902 EXPORT_SYMBOL(vme_dma_list_exec);
 903
 904 int vme_dma_list_free(struct vme_dma_list *list)
 905 {
 906         struct vme_bridge *bridge = list->parent->parent;
 907         int retval;
 908
 909         if (bridge->dma_list_empty == NULL) {
 910                 printk(KERN_WARNING "Emptying of Link Lists not supported\n");
 911                 return -EINVAL;
 912         }
 913
 914         if (!mutex_trylock(&list->mtx)) {
 915                 printk(KERN_ERR "Link List in use\n");
 916                 return -EINVAL;
 917         }
 918
 919         /*
 920          * Empty out all of the entries from the dma list. We need to go to the
 921          * low level driver as dma entries are driver specific.
 922          */
 923         retval = bridge->dma_list_empty(list);
 924         if (retval) {
 925                 printk(KERN_ERR "Unable to empty link-list entries\n");
 926                 mutex_unlock(&list->mtx);
 927                 return retval;
 928         }
 929         mutex_unlock(&list->mtx);
 930         kfree(list);
 931
 932         return retval;
 933 }
 934 EXPORT_SYMBOL(vme_dma_list_free);
 935
 936 int vme_dma_free(struct vme_resource *resource)
 937 {
 938         struct vme_dma_resource *ctrlr;
 939
 940         if (resource->type != VME_DMA) {
 941                 printk(KERN_ERR "Not a DMA resource\n");
 942                 return -EINVAL;
 943         }
 944
 945         ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
 946
 947         if (!mutex_trylock(&ctrlr->mtx)) {
 948                 printk(KERN_ERR "Resource busy, can't free\n");
 949                 return -EBUSY;
 950         }
 951
 952         if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) {
 953                 printk(KERN_WARNING "Resource still processing transfers\n");
 954                 mutex_unlock(&ctrlr->mtx);
 955                 return -EBUSY;
 956         }
 957
 958         ctrlr->locked = 0;
 959
 960         mutex_unlock(&ctrlr->mtx);
 961
 962         return 0;
 963 }
 964 EXPORT_SYMBOL(vme_dma_free);
 965
 966 void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
 967 {
 968         void (*call)(int, int, void *);
 969         void *priv_data;
 970
 971         call = bridge->irq[level - 1].callback[statid].func;
 972         priv_data = bridge->irq[level - 1].callback[statid].priv_data;
 973
 974         if (call != NULL)
 975                 call(level, statid, priv_data);
 976         else
 977                 printk(KERN_WARNING "Spurilous VME interrupt, level:%x, vector:%x\n",
 978                        level, statid);
 979 }
 980 EXPORT_SYMBOL(vme_irq_handler);
 981
 982 int vme_irq_request(struct vme_dev *vdev, int level, int statid,
 983         void (*callback)(int, int, void *),
 984         void *priv_data)
 985 {
 986         struct vme_bridge *bridge;
 987
 988         bridge = vdev->bridge;
 989         if (bridge == NULL) {
 990                 printk(KERN_ERR "Can't find VME bus\n");
 991                 return -EINVAL;
 992         }
 993
 994         if ((level < 1) || (level > 7)) {
 995                 printk(KERN_ERR "Invalid interrupt level\n");
 996                 return -EINVAL;
 997         }
 998
 999         if (bridge->irq_set == NULL) {
1000                 printk(KERN_ERR "Configuring interrupts not supported\n");
1001                 return -EINVAL;
1002         }
1003
1004         mutex_lock(&bridge->irq_mtx);
1005
1006         if (bridge->irq[level - 1].callback[statid].func) {
1007                 mutex_unlock(&bridge->irq_mtx);
1008                 printk(KERN_WARNING "VME Interrupt already taken\n");
1009                 return -EBUSY;
1010         }
1011
1012         bridge->irq[level - 1].count++;
1013         bridge->irq[level - 1].callback[statid].priv_data = priv_data;
1014         bridge->irq[level - 1].callback[statid].func = callback;
1015
1016         /* Enable IRQ level */
1017         bridge->irq_set(bridge, level, 1, 1);
1018
1019         mutex_unlock(&bridge->irq_mtx);
1020
1021         return 0;
1022 }
1023 EXPORT_SYMBOL(vme_irq_request);
1024
1025 void vme_irq_free(struct vme_dev *vdev, int level, int statid)
1026 {
1027         struct vme_bridge *bridge;
1028
1029         bridge = vdev->bridge;
1030         if (bridge == NULL) {
1031                 printk(KERN_ERR "Can't find VME bus\n");
1032                 return;
1033         }
1034
1035         if ((level < 1) || (level > 7)) {
1036                 printk(KERN_ERR "Invalid interrupt level\n");
1037                 return;
1038         }
1039
1040         if (bridge->irq_set == NULL) {
1041                 printk(KERN_ERR "Configuring interrupts not supported\n");
1042                 return;
1043         }
1044
1045         mutex_lock(&bridge->irq_mtx);
1046
1047         bridge->irq[level - 1].count--;
1048
1049         /* Disable IRQ level if no more interrupts attached at this level*/
1050         if (bridge->irq[level - 1].count == 0)
1051                 bridge->irq_set(bridge, level, 0, 1);
1052
1053         bridge->irq[level - 1].callback[statid].func = NULL;
1054         bridge->irq[level - 1].callback[statid].priv_data = NULL;
1055
1056         mutex_unlock(&bridge->irq_mtx);
1057 }
1058 EXPORT_SYMBOL(vme_irq_free);
1059
1060 int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
1061 {
1062         struct vme_bridge *bridge;
1063
1064         bridge = vdev->bridge;
1065         if (bridge == NULL) {
1066                 printk(KERN_ERR "Can't find VME bus\n");
1067                 return -EINVAL;
1068         }
1069
1070         if ((level < 1) || (level > 7)) {
1071                 printk(KERN_WARNING "Invalid interrupt level\n");
1072                 return -EINVAL;
1073         }
1074
1075         if (bridge->irq_generate == NULL) {
1076                 printk(KERN_WARNING "Interrupt generation not supported\n");
1077                 return -EINVAL;
1078         }
1079
1080         return bridge->irq_generate(bridge, level, statid);
1081 }
1082 EXPORT_SYMBOL(vme_irq_generate);
1083
1084 /*
1085  * Request the location monitor, return resource or NULL
1086  */
1087 struct vme_resource *vme_lm_request(struct vme_dev *vdev)
1088 {
1089         struct vme_bridge *bridge;
1090         struct list_head *lm_pos = NULL;
1091         struct vme_lm_resource *allocated_lm = NULL;
1092         struct vme_lm_resource *lm = NULL;
1093         struct vme_resource *resource = NULL;
1094
1095         bridge = vdev->bridge;
1096         if (bridge == NULL) {
1097                 printk(KERN_ERR "Can't find VME bus\n");
1098                 goto err_bus;
1099         }
1100
1101         /* Loop through DMA resources */
1102         list_for_each(lm_pos, &bridge->lm_resources) {
1103                 lm = list_entry(lm_pos,
1104                         struct vme_lm_resource, list);
1105
1106                 if (lm == NULL) {
1107                         printk(KERN_ERR "Registered NULL Location Monitor resource\n");
1108                         continue;
1109                 }
1110
1111                 /* Find an unlocked controller */
1112                 mutex_lock(&lm->mtx);
1113                 if (lm->locked == 0) {
1114                         lm->locked = 1;
1115                         mutex_unlock(&lm->mtx);
1116                         allocated_lm = lm;
1117                         break;
1118                 }
1119                 mutex_unlock(&lm->mtx);
1120         }
1121
1122         /* Check to see if we found a resource */
1123         if (allocated_lm == NULL)
1124                 goto err_lm;
1125
1126         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
1127         if (resource == NULL) {
1128                 printk(KERN_ERR "Unable to allocate resource structure\n");
1129                 goto err_alloc;
1130         }
1131         resource->type = VME_LM;
1132         resource->entry = &allocated_lm->list;
1133
1134         return resource;
1135
1136 err_alloc:
1137         /* Unlock image */
1138         mutex_lock(&lm->mtx);
1139         lm->locked = 0;
1140         mutex_unlock(&lm->mtx);
1141 err_lm:
1142 err_bus:
1143         return NULL;
1144 }
1145 EXPORT_SYMBOL(vme_lm_request);
1146
1147 int vme_lm_count(struct vme_resource *resource)
1148 {
1149         struct vme_lm_resource *lm;
1150
1151         if (resource->type != VME_LM) {
1152                 printk(KERN_ERR "Not a Location Monitor resource\n");
1153                 return -EINVAL;
1154         }
1155
1156         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1157
1158         return lm->monitors;
1159 }
1160 EXPORT_SYMBOL(vme_lm_count);
1161
1162 int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,
1163         u32 aspace, u32 cycle)
1164 {
1165         struct vme_bridge *bridge = find_bridge(resource);
1166         struct vme_lm_resource *lm;
1167
1168         if (resource->type != VME_LM) {
1169                 printk(KERN_ERR "Not a Location Monitor resource\n");
1170                 return -EINVAL;
1171         }
1172
1173         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1174
1175         if (bridge->lm_set == NULL) {
1176                 printk(KERN_ERR "vme_lm_set not supported\n");
1177                 return -EINVAL;
1178         }
1179
1180         return bridge->lm_set(lm, lm_base, aspace, cycle);
1181 }
1182 EXPORT_SYMBOL(vme_lm_set);
1183
1184 int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
1185         u32 *aspace, u32 *cycle)
1186 {
1187         struct vme_bridge *bridge = find_bridge(resource);
1188         struct vme_lm_resource *lm;
1189
1190         if (resource->type != VME_LM) {
1191                 printk(KERN_ERR "Not a Location Monitor resource\n");
1192                 return -EINVAL;
1193         }
1194
1195         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1196
1197         if (bridge->lm_get == NULL) {
1198                 printk(KERN_ERR "vme_lm_get not supported\n");
1199                 return -EINVAL;
1200         }
1201
1202         return bridge->lm_get(lm, lm_base, aspace, cycle);
1203 }
1204 EXPORT_SYMBOL(vme_lm_get);
1205
1206 int vme_lm_attach(struct vme_resource *resource, int monitor,
1207         void (*callback)(int))
1208 {
1209         struct vme_bridge *bridge = find_bridge(resource);
1210         struct vme_lm_resource *lm;
1211
1212         if (resource->type != VME_LM) {
1213                 printk(KERN_ERR "Not a Location Monitor resource\n");
1214                 return -EINVAL;
1215         }
1216
1217         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1218
1219         if (bridge->lm_attach == NULL) {
1220                 printk(KERN_ERR "vme_lm_attach not supported\n");
1221                 return -EINVAL;
1222         }
1223
1224         return bridge->lm_attach(lm, monitor, callback);
1225 }
1226 EXPORT_SYMBOL(vme_lm_attach);
1227
1228 int vme_lm_detach(struct vme_resource *resource, int monitor)
1229 {
1230         struct vme_bridge *bridge = find_bridge(resource);
1231         struct vme_lm_resource *lm;
1232
1233         if (resource->type != VME_LM) {
1234                 printk(KERN_ERR "Not a Location Monitor resource\n");
1235                 return -EINVAL;
1236         }
1237
1238         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1239
1240         if (bridge->lm_detach == NULL) {
1241                 printk(KERN_ERR "vme_lm_detach not supported\n");
1242                 return -EINVAL;
1243         }
1244
1245         return bridge->lm_detach(lm, monitor);
1246 }
1247 EXPORT_SYMBOL(vme_lm_detach);
1248
1249 void vme_lm_free(struct vme_resource *resource)
1250 {
1251         struct vme_lm_resource *lm;
1252
1253         if (resource->type != VME_LM) {
1254                 printk(KERN_ERR "Not a Location Monitor resource\n");
1255                 return;
1256         }
1257
1258         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1259
1260         mutex_lock(&lm->mtx);
1261
1262         /* XXX
1263          * Check to see that there aren't any callbacks still attached, if
1264          * there are we should probably be detaching them!
1265          */
1266
1267         lm->locked = 0;
1268
1269         mutex_unlock(&lm->mtx);
1270
1271         kfree(resource);
1272 }
1273 EXPORT_SYMBOL(vme_lm_free);
1274
1275 int vme_slot_get(struct vme_dev *vdev)
1276 {
1277         struct vme_bridge *bridge;
1278
1279         bridge = vdev->bridge;
1280         if (bridge == NULL) {
1281                 printk(KERN_ERR "Can't find VME bus\n");
1282                 return -EINVAL;
1283         }
1284
1285         if (bridge->slot_get == NULL) {
1286                 printk(KERN_WARNING "vme_slot_get not supported\n");
1287                 return -EINVAL;
1288         }
1289
1290         return bridge->slot_get(bridge);
1291 }
1292 EXPORT_SYMBOL(vme_slot_get);
1293
1294
1295 /* - Bridge Registration --------------------------------------------------- */
1296
1297 static void vme_dev_release(struct device *dev)
1298 {
1299         kfree(dev_to_vme_dev(dev));
1300 }
1301
1302 int vme_register_bridge(struct vme_bridge *bridge)
1303 {
1304         int i;
1305         int ret = -1;
1306
1307         mutex_lock(&vme_buses_lock);
1308         for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
1309                 if ((vme_bus_numbers & (1 << i)) == 0) {
1310                         vme_bus_numbers |= (1 << i);
1311                         bridge->num = i;
1312                         INIT_LIST_HEAD(&bridge->devices);
1313                         list_add_tail(&bridge->bus_list, &vme_bus_list);
1314                         ret = 0;
1315                         break;
1316                 }
1317         }
1318         mutex_unlock(&vme_buses_lock);
1319
1320         return ret;
1321 }
1322 EXPORT_SYMBOL(vme_register_bridge);
1323
1324 void vme_unregister_bridge(struct vme_bridge *bridge)
1325 {
1326         struct vme_dev *vdev;
1327         struct vme_dev *tmp;
1328
1329         mutex_lock(&vme_buses_lock);
1330         vme_bus_numbers &= ~(1 << bridge->num);
1331         list_for_each_entry_safe(vdev, tmp, &bridge->devices, bridge_list) {
1332                 list_del(&vdev->drv_list);
1333                 list_del(&vdev->bridge_list);
1334                 device_unregister(&vdev->dev);
1335         }
1336         list_del(&bridge->bus_list);
1337         mutex_unlock(&vme_buses_lock);
1338 }
1339 EXPORT_SYMBOL(vme_unregister_bridge);
1340
1341 /* - Driver Registration --------------------------------------------------- */
1342
1343 static int __vme_register_driver_bus(struct vme_driver *drv,
1344         struct vme_bridge *bridge, unsigned int ndevs)
1345 {
1346         int err;
1347         unsigned int i;
1348         struct vme_dev *vdev;
1349         struct vme_dev *tmp;
1350
1351         for (i = 0; i < ndevs; i++) {
1352                 vdev = kzalloc(sizeof(struct vme_dev), GFP_KERNEL);
1353                 if (!vdev) {
1354                         err = -ENOMEM;
1355                         goto err_devalloc;
1356                 }
1357                 vdev->num = i;
1358                 vdev->bridge = bridge;
1359                 vdev->dev.platform_data = drv;
1360                 vdev->dev.release = vme_dev_release;
1361                 vdev->dev.parent = bridge->parent;
1362                 vdev->dev.bus = &vme_bus_type;
1363                 dev_set_name(&vdev->dev, "%s.%u-%u", drv->name, bridge->num,
1364                         vdev->num);
1365
1366                 err = device_register(&vdev->dev);
1367                 if (err)
1368                         goto err_reg;
1369
1370                 if (vdev->dev.platform_data) {
1371                         list_add_tail(&vdev->drv_list, &drv->devices);
1372                         list_add_tail(&vdev->bridge_list, &bridge->devices);
1373                 } else
1374                         device_unregister(&vdev->dev);
1375         }
1376         return 0;
1377
1378 err_reg:
1379         kfree(vdev);
1380 err_devalloc:
1381         list_for_each_entry_safe(vdev, tmp, &drv->devices, drv_list) {
1382                 list_del(&vdev->drv_list);
1383                 list_del(&vdev->bridge_list);
1384                 device_unregister(&vdev->dev);
1385         }
1386         return err;
1387 }
1388
1389 static int __vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
1390 {
1391         struct vme_bridge *bridge;
1392         int err = 0;
1393
1394         mutex_lock(&vme_buses_lock);
1395         list_for_each_entry(bridge, &vme_bus_list, bus_list) {
1396                 /*
1397                  * This cannot cause trouble as we already have vme_buses_lock
1398                  * and if the bridge is removed, it will have to go through
1399                  * vme_unregister_bridge() to do it (which calls remove() on
1400                  * the bridge which in turn tries to acquire vme_buses_lock and
1401                  * will have to wait).
1402                  */
1403                 err = __vme_register_driver_bus(drv, bridge, ndevs);
1404                 if (err)
1405                         break;
1406         }
1407         mutex_unlock(&vme_buses_lock);
1408         return err;
1409 }
1410
1411 int vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
1412 {
1413         int err;
1414
1415         drv->driver.name = drv->name;
1416         drv->driver.bus = &vme_bus_type;
1417         INIT_LIST_HEAD(&drv->devices);
1418
1419         err = driver_register(&drv->driver);
1420         if (err)
1421                 return err;
1422
1423         err = __vme_register_driver(drv, ndevs);
1424         if (err)
1425                 driver_unregister(&drv->driver);
1426
1427         return err;
1428 }
1429 EXPORT_SYMBOL(vme_register_driver);
1430
1431 void vme_unregister_driver(struct vme_driver *drv)
1432 {
1433         struct vme_dev *dev, *dev_tmp;
1434
1435         mutex_lock(&vme_buses_lock);
1436         list_for_each_entry_safe(dev, dev_tmp, &drv->devices, drv_list) {
1437                 list_del(&dev->drv_list);
1438                 list_del(&dev->bridge_list);
1439                 device_unregister(&dev->dev);
1440         }
1441         mutex_unlock(&vme_buses_lock);
1442
1443         driver_unregister(&drv->driver);
1444 }
1445 EXPORT_SYMBOL(vme_unregister_driver);
1446
1447 /* - Bus Registration ------------------------------------------------------ */
1448
1449 static int vme_bus_match(struct device *dev, struct device_driver *drv)
1450 {
1451         struct vme_driver *vme_drv;
1452
1453         vme_drv = container_of(drv, struct vme_driver, driver);
1454
1455         if (dev->platform_data == vme_drv) {
1456                 struct vme_dev *vdev = dev_to_vme_dev(dev);
1457
1458                 if (vme_drv->match && vme_drv->match(vdev))
1459                         return 1;
1460
1461                 dev->platform_data = NULL;
1462         }
1463         return 0;
1464 }
1465
1466 static int vme_bus_probe(struct device *dev)
1467 {
1468         int retval = -ENODEV;
1469         struct vme_driver *driver;
1470         struct vme_dev *vdev = dev_to_vme_dev(dev);
1471
1472         driver = dev->platform_data;
1473
1474         if (driver->probe != NULL)
1475                 retval = driver->probe(vdev);
1476
1477         return retval;
1478 }
1479
1480 static int vme_bus_remove(struct device *dev)
1481 {
1482         int retval = -ENODEV;
1483         struct vme_driver *driver;
1484         struct vme_dev *vdev = dev_to_vme_dev(dev);
1485
1486         driver = dev->platform_data;
1487
1488         if (driver->remove != NULL)
1489                 retval = driver->remove(vdev);
1490
1491         return retval;
1492 }
1493
1494 struct bus_type vme_bus_type = {
1495         .name = "vme",
1496         .match = vme_bus_match,
1497         .probe = vme_bus_probe,
1498         .remove = vme_bus_remove,
1499 };
1500 EXPORT_SYMBOL(vme_bus_type);
1501
1502 static int __init vme_init(void)
1503 {
1504         return bus_register(&vme_bus_type);
1505 }
1506
1507 static void __exit vme_exit(void)
1508 {
1509         bus_unregister(&vme_bus_type);
1510 }
1511
1512 MODULE_DESCRIPTION("VME bridge driver framework");
1513 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
1514 MODULE_LICENSE("GPL");
1515
1516 module_init(vme_init);
1517 module_exit(vme_exit);