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/init.h>
  17 #include <linux/export.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 int __init vme_init(void);
  43
  44 static struct vme_dev *dev_to_vme_dev(struct device *dev)
  45 {
  46         return container_of(dev, struct vme_dev, dev);
  47 }
  48
  49 /*
  50  * Find the bridge that the resource is associated with.
  51  */
  52 static struct vme_bridge *find_bridge(struct vme_resource *resource)
  53 {
  54         /* Get list to search */
  55         switch (resource->type) {
  56         case VME_MASTER:
  57                 return list_entry(resource->entry, struct vme_master_resource,
  58                         list)->parent;
  59                 break;
  60         case VME_SLAVE:
  61                 return list_entry(resource->entry, struct vme_slave_resource,
  62                         list)->parent;
  63                 break;
  64         case VME_DMA:
  65                 return list_entry(resource->entry, struct vme_dma_resource,
  66                         list)->parent;
  67                 break;
  68         case VME_LM:
  69                 return list_entry(resource->entry, struct vme_lm_resource,
  70                         list)->parent;
  71                 break;
  72         default:
  73                 printk(KERN_ERR "Unknown resource type\n");
  74                 return NULL;
  75                 break;
  76         }
  77 }
  78
  79 /*
  80  * Allocate a contiguous block of memory for use by the driver. This is used to
  81  * create the buffers for the slave windows.
  82  */
  83 void *vme_alloc_consistent(struct vme_resource *resource, size_t size,
  84         dma_addr_t *dma)
  85 {
  86         struct vme_bridge *bridge;
  87
  88         if (resource == NULL) {
  89                 printk(KERN_ERR "No resource\n");
  90                 return NULL;
  91         }
  92
  93         bridge = find_bridge(resource);
  94         if (bridge == NULL) {
  95                 printk(KERN_ERR "Can't find bridge\n");
  96                 return NULL;
  97         }
  98
  99         if (bridge->parent == NULL) {
 100                 printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
 101                 return NULL;
 102         }
 103
 104         if (bridge->alloc_consistent == NULL) {
 105                 printk(KERN_ERR "alloc_consistent not supported by bridge %s\n",
 106                        bridge->name);
 107                 return NULL;
 108         }
 109
 110         return bridge->alloc_consistent(bridge->parent, size, dma);
 111 }
 112 EXPORT_SYMBOL(vme_alloc_consistent);
 113
 114 /*
 115  * Free previously allocated contiguous block of memory.
 116  */
 117 void vme_free_consistent(struct vme_resource *resource, size_t size,
 118         void *vaddr, dma_addr_t dma)
 119 {
 120         struct vme_bridge *bridge;
 121
 122         if (resource == NULL) {
 123                 printk(KERN_ERR "No resource\n");
 124                 return;
 125         }
 126
 127         bridge = find_bridge(resource);
 128         if (bridge == NULL) {
 129                 printk(KERN_ERR "Can't find bridge\n");
 130                 return;
 131         }
 132
 133         if (bridge->parent == NULL) {
 134                 printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name);
 135                 return;
 136         }
 137
 138         if (bridge->free_consistent == NULL) {
 139                 printk(KERN_ERR "free_consistent not supported by bridge %s\n",
 140                        bridge->name);
 141                 return;
 142         }
 143
 144         bridge->free_consistent(bridge->parent, 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         u32 aspace, cycle, dwidth;
 154
 155         switch (resource->type) {
 156         case VME_MASTER:
 157                 retval = vme_master_get(resource, &enabled, &base, &size,
 158                         &aspace, &cycle, &dwidth);
 159                 if (retval)
 160                         return 0;
 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                 if (retval)
 168                         return 0;
 169
 170                 return size;
 171                 break;
 172         case VME_DMA:
 173                 return 0;
 174                 break;
 175         default:
 176                 printk(KERN_ERR "Unknown resource type\n");
 177                 return 0;
 178                 break;
 179         }
 180 }
 181 EXPORT_SYMBOL(vme_get_size);
 182
 183 int vme_check_window(u32 aspace, unsigned long long vme_base,
 184                      unsigned long long size)
 185 {
 186         int retval = 0;
 187
 188         switch (aspace) {
 189         case VME_A16:
 190                 if (((vme_base + size) > VME_A16_MAX) ||
 191                                 (vme_base > VME_A16_MAX))
 192                         retval = -EFAULT;
 193                 break;
 194         case VME_A24:
 195                 if (((vme_base + size) > VME_A24_MAX) ||
 196                                 (vme_base > VME_A24_MAX))
 197                         retval = -EFAULT;
 198                 break;
 199         case VME_A32:
 200                 if (((vme_base + size) > VME_A32_MAX) ||
 201                                 (vme_base > VME_A32_MAX))
 202                         retval = -EFAULT;
 203                 break;
 204         case VME_A64:
 205                 if ((size != 0) && (vme_base > U64_MAX + 1 - size))
 206                         retval = -EFAULT;
 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(KERN_ERR "Invalid address space\n");
 221                 retval = -EINVAL;
 222                 break;
 223         }
 224
 225         return retval;
 226 }
 227 EXPORT_SYMBOL(vme_check_window);
 228
 229 static u32 vme_get_aspace(int am)
 230 {
 231         switch (am) {
 232         case 0x29:
 233         case 0x2D:
 234                 return VME_A16;
 235         case 0x38:
 236         case 0x39:
 237         case 0x3A:
 238         case 0x3B:
 239         case 0x3C:
 240         case 0x3D:
 241         case 0x3E:
 242         case 0x3F:
 243                 return VME_A24;
 244         case 0x8:
 245         case 0x9:
 246         case 0xA:
 247         case 0xB:
 248         case 0xC:
 249         case 0xD:
 250         case 0xE:
 251         case 0xF:
 252                 return VME_A32;
 253         case 0x0:
 254         case 0x1:
 255         case 0x3:
 256                 return VME_A64;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /*
 263  * Request a slave image with specific attributes, return some unique
 264  * identifier.
 265  */
 266 struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address,
 267         u32 cycle)
 268 {
 269         struct vme_bridge *bridge;
 270         struct list_head *slave_pos = NULL;
 271         struct vme_slave_resource *allocated_image = NULL;
 272         struct vme_slave_resource *slave_image = NULL;
 273         struct vme_resource *resource = NULL;
 274
 275         bridge = vdev->bridge;
 276         if (bridge == NULL) {
 277                 printk(KERN_ERR "Can't find VME bus\n");
 278                 goto err_bus;
 279         }
 280
 281         /* Loop through slave resources */
 282         list_for_each(slave_pos, &bridge->slave_resources) {
 283                 slave_image = list_entry(slave_pos,
 284                         struct vme_slave_resource, list);
 285
 286                 if (slave_image == NULL) {
 287                         printk(KERN_ERR "Registered NULL Slave resource\n");
 288                         continue;
 289                 }
 290
 291                 /* Find an unlocked and compatible image */
 292                 mutex_lock(&slave_image->mtx);
 293                 if (((slave_image->address_attr & address) == address) &&
 294                         ((slave_image->cycle_attr & cycle) == cycle) &&
 295                         (slave_image->locked == 0)) {
 296
 297                         slave_image->locked = 1;
 298                         mutex_unlock(&slave_image->mtx);
 299                         allocated_image = slave_image;
 300                         break;
 301                 }
 302                 mutex_unlock(&slave_image->mtx);
 303         }
 304
 305         /* No free image */
 306         if (allocated_image == NULL)
 307                 goto err_image;
 308
 309         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 310         if (resource == NULL) {
 311                 printk(KERN_WARNING "Unable to allocate resource structure\n");
 312                 goto err_alloc;
 313         }
 314         resource->type = VME_SLAVE;
 315         resource->entry = &allocated_image->list;
 316
 317         return resource;
 318
 319 err_alloc:
 320         /* Unlock image */
 321         mutex_lock(&slave_image->mtx);
 322         slave_image->locked = 0;
 323         mutex_unlock(&slave_image->mtx);
 324 err_image:
 325 err_bus:
 326         return NULL;
 327 }
 328 EXPORT_SYMBOL(vme_slave_request);
 329
 330 int vme_slave_set(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         int retval;
 337
 338         if (resource->type != VME_SLAVE) {
 339                 printk(KERN_ERR "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_set == NULL) {
 346                 printk(KERN_ERR "Function not supported\n");
 347                 return -ENOSYS;
 348         }
 349
 350         if (!(((image->address_attr & aspace) == aspace) &&
 351                 ((image->cycle_attr & cycle) == cycle))) {
 352                 printk(KERN_ERR "Invalid attributes\n");
 353                 return -EINVAL;
 354         }
 355
 356         retval = vme_check_window(aspace, vme_base, size);
 357         if (retval)
 358                 return retval;
 359
 360         return bridge->slave_set(image, enabled, vme_base, size, buf_base,
 361                 aspace, cycle);
 362 }
 363 EXPORT_SYMBOL(vme_slave_set);
 364
 365 int vme_slave_get(struct vme_resource *resource, int *enabled,
 366         unsigned long long *vme_base, unsigned long long *size,
 367         dma_addr_t *buf_base, u32 *aspace, u32 *cycle)
 368 {
 369         struct vme_bridge *bridge = find_bridge(resource);
 370         struct vme_slave_resource *image;
 371
 372         if (resource->type != VME_SLAVE) {
 373                 printk(KERN_ERR "Not a slave resource\n");
 374                 return -EINVAL;
 375         }
 376
 377         image = list_entry(resource->entry, struct vme_slave_resource, list);
 378
 379         if (bridge->slave_get == NULL) {
 380                 printk(KERN_ERR "vme_slave_get not supported\n");
 381                 return -EINVAL;
 382         }
 383
 384         return bridge->slave_get(image, enabled, vme_base, size, buf_base,
 385                 aspace, cycle);
 386 }
 387 EXPORT_SYMBOL(vme_slave_get);
 388
 389 void vme_slave_free(struct vme_resource *resource)
 390 {
 391         struct vme_slave_resource *slave_image;
 392
 393         if (resource->type != VME_SLAVE) {
 394                 printk(KERN_ERR "Not a slave resource\n");
 395                 return;
 396         }
 397
 398         slave_image = list_entry(resource->entry, struct vme_slave_resource,
 399                 list);
 400         if (slave_image == NULL) {
 401                 printk(KERN_ERR "Can't find slave resource\n");
 402                 return;
 403         }
 404
 405         /* Unlock image */
 406         mutex_lock(&slave_image->mtx);
 407         if (slave_image->locked == 0)
 408                 printk(KERN_ERR "Image is already free\n");
 409
 410         slave_image->locked = 0;
 411         mutex_unlock(&slave_image->mtx);
 412
 413         /* Free up resource memory */
 414         kfree(resource);
 415 }
 416 EXPORT_SYMBOL(vme_slave_free);
 417
 418 /*
 419  * Request a master image with specific attributes, return some unique
 420  * identifier.
 421  */
 422 struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address,
 423         u32 cycle, u32 dwidth)
 424 {
 425         struct vme_bridge *bridge;
 426         struct list_head *master_pos = NULL;
 427         struct vme_master_resource *allocated_image = NULL;
 428         struct vme_master_resource *master_image = NULL;
 429         struct vme_resource *resource = NULL;
 430
 431         bridge = vdev->bridge;
 432         if (bridge == NULL) {
 433                 printk(KERN_ERR "Can't find VME bus\n");
 434                 goto err_bus;
 435         }
 436
 437         /* Loop through master resources */
 438         list_for_each(master_pos, &bridge->master_resources) {
 439                 master_image = list_entry(master_pos,
 440                         struct vme_master_resource, list);
 441
 442                 if (master_image == NULL) {
 443                         printk(KERN_WARNING "Registered NULL master resource\n");
 444                         continue;
 445                 }
 446
 447                 /* Find an unlocked and compatible image */
 448                 spin_lock(&master_image->lock);
 449                 if (((master_image->address_attr & address) == address) &&
 450                         ((master_image->cycle_attr & cycle) == cycle) &&
 451                         ((master_image->width_attr & dwidth) == dwidth) &&
 452                         (master_image->locked == 0)) {
 453
 454                         master_image->locked = 1;
 455                         spin_unlock(&master_image->lock);
 456                         allocated_image = master_image;
 457                         break;
 458                 }
 459                 spin_unlock(&master_image->lock);
 460         }
 461
 462         /* Check to see if we found a resource */
 463         if (allocated_image == NULL) {
 464                 printk(KERN_ERR "Can't find a suitable resource\n");
 465                 goto err_image;
 466         }
 467
 468         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 469         if (resource == NULL) {
 470                 printk(KERN_ERR "Unable to allocate resource structure\n");
 471                 goto err_alloc;
 472         }
 473         resource->type = VME_MASTER;
 474         resource->entry = &allocated_image->list;
 475
 476         return resource;
 477
 478 err_alloc:
 479         /* Unlock image */
 480         spin_lock(&master_image->lock);
 481         master_image->locked = 0;
 482         spin_unlock(&master_image->lock);
 483 err_image:
 484 err_bus:
 485         return NULL;
 486 }
 487 EXPORT_SYMBOL(vme_master_request);
 488
 489 int vme_master_set(struct vme_resource *resource, int enabled,
 490         unsigned long long vme_base, unsigned long long size, u32 aspace,
 491         u32 cycle, u32 dwidth)
 492 {
 493         struct vme_bridge *bridge = find_bridge(resource);
 494         struct vme_master_resource *image;
 495         int retval;
 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_set == NULL) {
 505                 printk(KERN_WARNING "vme_master_set not supported\n");
 506                 return -EINVAL;
 507         }
 508
 509         if (!(((image->address_attr & aspace) == aspace) &&
 510                 ((image->cycle_attr & cycle) == cycle) &&
 511                 ((image->width_attr & dwidth) == dwidth))) {
 512                 printk(KERN_WARNING "Invalid attributes\n");
 513                 return -EINVAL;
 514         }
 515
 516         retval = vme_check_window(aspace, vme_base, size);
 517         if (retval)
 518                 return retval;
 519
 520         return bridge->master_set(image, enabled, vme_base, size, aspace,
 521                 cycle, dwidth);
 522 }
 523 EXPORT_SYMBOL(vme_master_set);
 524
 525 int vme_master_get(struct vme_resource *resource, int *enabled,
 526         unsigned long long *vme_base, unsigned long long *size, u32 *aspace,
 527         u32 *cycle, u32 *dwidth)
 528 {
 529         struct vme_bridge *bridge = find_bridge(resource);
 530         struct vme_master_resource *image;
 531
 532         if (resource->type != VME_MASTER) {
 533                 printk(KERN_ERR "Not a master resource\n");
 534                 return -EINVAL;
 535         }
 536
 537         image = list_entry(resource->entry, struct vme_master_resource, list);
 538
 539         if (bridge->master_get == NULL) {
 540                 printk(KERN_WARNING "%s not supported\n", __func__);
 541                 return -EINVAL;
 542         }
 543
 544         return bridge->master_get(image, enabled, vme_base, size, aspace,
 545                 cycle, dwidth);
 546 }
 547 EXPORT_SYMBOL(vme_master_get);
 548
 549 /*
 550  * Read data out of VME space into a buffer.
 551  */
 552 ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count,
 553         loff_t offset)
 554 {
 555         struct vme_bridge *bridge = find_bridge(resource);
 556         struct vme_master_resource *image;
 557         size_t length;
 558
 559         if (bridge->master_read == NULL) {
 560                 printk(KERN_WARNING "Reading from resource not supported\n");
 561                 return -EINVAL;
 562         }
 563
 564         if (resource->type != VME_MASTER) {
 565                 printk(KERN_ERR "Not a master resource\n");
 566                 return -EINVAL;
 567         }
 568
 569         image = list_entry(resource->entry, struct vme_master_resource, list);
 570
 571         length = vme_get_size(resource);
 572
 573         if (offset > length) {
 574                 printk(KERN_WARNING "Invalid Offset\n");
 575                 return -EFAULT;
 576         }
 577
 578         if ((offset + count) > length)
 579                 count = length - offset;
 580
 581         return bridge->master_read(image, buf, count, offset);
 582
 583 }
 584 EXPORT_SYMBOL(vme_master_read);
 585
 586 /*
 587  * Write data out to VME space from a buffer.
 588  */
 589 ssize_t vme_master_write(struct vme_resource *resource, void *buf,
 590         size_t count, loff_t offset)
 591 {
 592         struct vme_bridge *bridge = find_bridge(resource);
 593         struct vme_master_resource *image;
 594         size_t length;
 595
 596         if (bridge->master_write == 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         length = vme_get_size(resource);
 609
 610         if (offset > length) {
 611                 printk(KERN_WARNING "Invalid Offset\n");
 612                 return -EFAULT;
 613         }
 614
 615         if ((offset + count) > length)
 616                 count = length - offset;
 617
 618         return bridge->master_write(image, buf, count, offset);
 619 }
 620 EXPORT_SYMBOL(vme_master_write);
 621
 622 /*
 623  * Perform RMW cycle to provided location.
 624  */
 625 unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask,
 626         unsigned int compare, unsigned int swap, loff_t offset)
 627 {
 628         struct vme_bridge *bridge = find_bridge(resource);
 629         struct vme_master_resource *image;
 630
 631         if (bridge->master_rmw == NULL) {
 632                 printk(KERN_WARNING "Writing to resource not supported\n");
 633                 return -EINVAL;
 634         }
 635
 636         if (resource->type != VME_MASTER) {
 637                 printk(KERN_ERR "Not a master resource\n");
 638                 return -EINVAL;
 639         }
 640
 641         image = list_entry(resource->entry, struct vme_master_resource, list);
 642
 643         return bridge->master_rmw(image, mask, compare, swap, offset);
 644 }
 645 EXPORT_SYMBOL(vme_master_rmw);
 646
 647 int vme_master_mmap(struct vme_resource *resource, struct vm_area_struct *vma)
 648 {
 649         struct vme_master_resource *image;
 650         phys_addr_t phys_addr;
 651         unsigned long vma_size;
 652
 653         if (resource->type != VME_MASTER) {
 654                 pr_err("Not a master resource\n");
 655                 return -EINVAL;
 656         }
 657
 658         image = list_entry(resource->entry, struct vme_master_resource, list);
 659         phys_addr = image->bus_resource.start + (vma->vm_pgoff << PAGE_SHIFT);
 660         vma_size = vma->vm_end - vma->vm_start;
 661
 662         if (phys_addr + vma_size > image->bus_resource.end + 1) {
 663                 pr_err("Map size cannot exceed the window size\n");
 664                 return -EFAULT;
 665         }
 666
 667         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 668
 669         return vm_iomap_memory(vma, phys_addr, vma->vm_end - vma->vm_start);
 670 }
 671 EXPORT_SYMBOL(vme_master_mmap);
 672
 673 void vme_master_free(struct vme_resource *resource)
 674 {
 675         struct vme_master_resource *master_image;
 676
 677         if (resource->type != VME_MASTER) {
 678                 printk(KERN_ERR "Not a master resource\n");
 679                 return;
 680         }
 681
 682         master_image = list_entry(resource->entry, struct vme_master_resource,
 683                 list);
 684         if (master_image == NULL) {
 685                 printk(KERN_ERR "Can't find master resource\n");
 686                 return;
 687         }
 688
 689         /* Unlock image */
 690         spin_lock(&master_image->lock);
 691         if (master_image->locked == 0)
 692                 printk(KERN_ERR "Image is already free\n");
 693
 694         master_image->locked = 0;
 695         spin_unlock(&master_image->lock);
 696
 697         /* Free up resource memory */
 698         kfree(resource);
 699 }
 700 EXPORT_SYMBOL(vme_master_free);
 701
 702 /*
 703  * Request a DMA controller with specific attributes, return some unique
 704  * identifier.
 705  */
 706 struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route)
 707 {
 708         struct vme_bridge *bridge;
 709         struct list_head *dma_pos = NULL;
 710         struct vme_dma_resource *allocated_ctrlr = NULL;
 711         struct vme_dma_resource *dma_ctrlr = NULL;
 712         struct vme_resource *resource = NULL;
 713
 714         /* XXX Not checking resource attributes */
 715         printk(KERN_ERR "No VME resource Attribute tests done\n");
 716
 717         bridge = vdev->bridge;
 718         if (bridge == NULL) {
 719                 printk(KERN_ERR "Can't find VME bus\n");
 720                 goto err_bus;
 721         }
 722
 723         /* Loop through DMA resources */
 724         list_for_each(dma_pos, &bridge->dma_resources) {
 725                 dma_ctrlr = list_entry(dma_pos,
 726                         struct vme_dma_resource, list);
 727
 728                 if (dma_ctrlr == NULL) {
 729                         printk(KERN_ERR "Registered NULL DMA resource\n");
 730                         continue;
 731                 }
 732
 733                 /* Find an unlocked and compatible controller */
 734                 mutex_lock(&dma_ctrlr->mtx);
 735                 if (((dma_ctrlr->route_attr & route) == route) &&
 736                         (dma_ctrlr->locked == 0)) {
 737
 738                         dma_ctrlr->locked = 1;
 739                         mutex_unlock(&dma_ctrlr->mtx);
 740                         allocated_ctrlr = dma_ctrlr;
 741                         break;
 742                 }
 743                 mutex_unlock(&dma_ctrlr->mtx);
 744         }
 745
 746         /* Check to see if we found a resource */
 747         if (allocated_ctrlr == NULL)
 748                 goto err_ctrlr;
 749
 750         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
 751         if (resource == NULL) {
 752                 printk(KERN_WARNING "Unable to allocate resource structure\n");
 753                 goto err_alloc;
 754         }
 755         resource->type = VME_DMA;
 756         resource->entry = &allocated_ctrlr->list;
 757
 758         return resource;
 759
 760 err_alloc:
 761         /* Unlock image */
 762         mutex_lock(&dma_ctrlr->mtx);
 763         dma_ctrlr->locked = 0;
 764         mutex_unlock(&dma_ctrlr->mtx);
 765 err_ctrlr:
 766 err_bus:
 767         return NULL;
 768 }
 769 EXPORT_SYMBOL(vme_dma_request);
 770
 771 /*
 772  * Start new list
 773  */
 774 struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource)
 775 {
 776         struct vme_dma_resource *ctrlr;
 777         struct vme_dma_list *dma_list;
 778
 779         if (resource->type != VME_DMA) {
 780                 printk(KERN_ERR "Not a DMA resource\n");
 781                 return NULL;
 782         }
 783
 784         ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
 785
 786         dma_list = kmalloc(sizeof(struct vme_dma_list), GFP_KERNEL);
 787         if (dma_list == NULL) {
 788                 printk(KERN_ERR "Unable to allocate memory for new DMA list\n");
 789                 return NULL;
 790         }
 791         INIT_LIST_HEAD(&dma_list->entries);
 792         dma_list->parent = ctrlr;
 793         mutex_init(&dma_list->mtx);
 794
 795         return dma_list;
 796 }
 797 EXPORT_SYMBOL(vme_new_dma_list);
 798
 799 /*
 800  * Create "Pattern" type attributes
 801  */
 802 struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, u32 type)
 803 {
 804         struct vme_dma_attr *attributes;
 805         struct vme_dma_pattern *pattern_attr;
 806
 807         attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
 808         if (attributes == NULL) {
 809                 printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
 810                 goto err_attr;
 811         }
 812
 813         pattern_attr = kmalloc(sizeof(struct vme_dma_pattern), GFP_KERNEL);
 814         if (pattern_attr == NULL) {
 815                 printk(KERN_ERR "Unable to allocate memory for pattern attributes\n");
 816                 goto err_pat;
 817         }
 818
 819         attributes->type = VME_DMA_PATTERN;
 820         attributes->private = (void *)pattern_attr;
 821
 822         pattern_attr->pattern = pattern;
 823         pattern_attr->type = type;
 824
 825         return attributes;
 826
 827 err_pat:
 828         kfree(attributes);
 829 err_attr:
 830         return NULL;
 831 }
 832 EXPORT_SYMBOL(vme_dma_pattern_attribute);
 833
 834 /*
 835  * Create "PCI" type attributes
 836  */
 837 struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address)
 838 {
 839         struct vme_dma_attr *attributes;
 840         struct vme_dma_pci *pci_attr;
 841
 842         /* XXX Run some sanity checks here */
 843
 844         attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL);
 845         if (attributes == NULL) {
 846                 printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
 847                 goto err_attr;
 848         }
 849
 850         pci_attr = kmalloc(sizeof(struct vme_dma_pci), GFP_KERNEL);
 851         if (pci_attr == NULL) {
 852                 printk(KERN_ERR "Unable to allocate memory for PCI attributes\n");
 853                 goto err_pci;
 854         }
 855
 856
 857
 858         attributes->type = VME_DMA_PCI;
 859         attributes->private = (void *)pci_attr;
 860
 861         pci_attr->address = address;
 862
 863         return attributes;
 864
 865 err_pci:
 866         kfree(attributes);
 867 err_attr:
 868         return NULL;
 869 }
 870 EXPORT_SYMBOL(vme_dma_pci_attribute);
 871
 872 /*
 873  * Create "VME" type attributes
 874  */
 875 struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address,
 876         u32 aspace, u32 cycle, u32 dwidth)
 877 {
 878         struct vme_dma_attr *attributes;
 879         struct vme_dma_vme *vme_attr;
 880
 881         attributes = kmalloc(
 882                 sizeof(struct vme_dma_attr), GFP_KERNEL);
 883         if (attributes == NULL) {
 884                 printk(KERN_ERR "Unable to allocate memory for attributes structure\n");
 885                 goto err_attr;
 886         }
 887
 888         vme_attr = kmalloc(sizeof(struct vme_dma_vme), GFP_KERNEL);
 889         if (vme_attr == NULL) {
 890                 printk(KERN_ERR "Unable to allocate memory for VME attributes\n");
 891                 goto err_vme;
 892         }
 893
 894         attributes->type = VME_DMA_VME;
 895         attributes->private = (void *)vme_attr;
 896
 897         vme_attr->address = address;
 898         vme_attr->aspace = aspace;
 899         vme_attr->cycle = cycle;
 900         vme_attr->dwidth = dwidth;
 901
 902         return attributes;
 903
 904 err_vme:
 905         kfree(attributes);
 906 err_attr:
 907         return NULL;
 908 }
 909 EXPORT_SYMBOL(vme_dma_vme_attribute);
 910
 911 /*
 912  * Free attribute
 913  */
 914 void vme_dma_free_attribute(struct vme_dma_attr *attributes)
 915 {
 916         kfree(attributes->private);
 917         kfree(attributes);
 918 }
 919 EXPORT_SYMBOL(vme_dma_free_attribute);
 920
 921 int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
 922         struct vme_dma_attr *dest, size_t count)
 923 {
 924         struct vme_bridge *bridge = list->parent->parent;
 925         int retval;
 926
 927         if (bridge->dma_list_add == NULL) {
 928                 printk(KERN_WARNING "Link List DMA generation not supported\n");
 929                 return -EINVAL;
 930         }
 931
 932         if (!mutex_trylock(&list->mtx)) {
 933                 printk(KERN_ERR "Link List already submitted\n");
 934                 return -EINVAL;
 935         }
 936
 937         retval = bridge->dma_list_add(list, src, dest, count);
 938
 939         mutex_unlock(&list->mtx);
 940
 941         return retval;
 942 }
 943 EXPORT_SYMBOL(vme_dma_list_add);
 944
 945 int vme_dma_list_exec(struct vme_dma_list *list)
 946 {
 947         struct vme_bridge *bridge = list->parent->parent;
 948         int retval;
 949
 950         if (bridge->dma_list_exec == NULL) {
 951                 printk(KERN_ERR "Link List DMA execution not supported\n");
 952                 return -EINVAL;
 953         }
 954
 955         mutex_lock(&list->mtx);
 956
 957         retval = bridge->dma_list_exec(list);
 958
 959         mutex_unlock(&list->mtx);
 960
 961         return retval;
 962 }
 963 EXPORT_SYMBOL(vme_dma_list_exec);
 964
 965 int vme_dma_list_free(struct vme_dma_list *list)
 966 {
 967         struct vme_bridge *bridge = list->parent->parent;
 968         int retval;
 969
 970         if (bridge->dma_list_empty == NULL) {
 971                 printk(KERN_WARNING "Emptying of Link Lists not supported\n");
 972                 return -EINVAL;
 973         }
 974
 975         if (!mutex_trylock(&list->mtx)) {
 976                 printk(KERN_ERR "Link List in use\n");
 977                 return -EINVAL;
 978         }
 979
 980         /*
 981          * Empty out all of the entries from the DMA list. We need to go to the
 982          * low level driver as DMA entries are driver specific.
 983          */
 984         retval = bridge->dma_list_empty(list);
 985         if (retval) {
 986                 printk(KERN_ERR "Unable to empty link-list entries\n");
 987                 mutex_unlock(&list->mtx);
 988                 return retval;
 989         }
 990         mutex_unlock(&list->mtx);
 991         kfree(list);
 992
 993         return retval;
 994 }
 995 EXPORT_SYMBOL(vme_dma_list_free);
 996
 997 int vme_dma_free(struct vme_resource *resource)
 998 {
 999         struct vme_dma_resource *ctrlr;
1000
1001         if (resource->type != VME_DMA) {
1002                 printk(KERN_ERR "Not a DMA resource\n");
1003                 return -EINVAL;
1004         }
1005
1006         ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
1007
1008         if (!mutex_trylock(&ctrlr->mtx)) {
1009                 printk(KERN_ERR "Resource busy, can't free\n");
1010                 return -EBUSY;
1011         }
1012
1013         if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) {
1014                 printk(KERN_WARNING "Resource still processing transfers\n");
1015                 mutex_unlock(&ctrlr->mtx);
1016                 return -EBUSY;
1017         }
1018
1019         ctrlr->locked = 0;
1020
1021         mutex_unlock(&ctrlr->mtx);
1022
1023         kfree(resource);
1024
1025         return 0;
1026 }
1027 EXPORT_SYMBOL(vme_dma_free);
1028
1029 void vme_bus_error_handler(struct vme_bridge *bridge,
1030                            unsigned long long address, int am)
1031 {
1032         struct list_head *handler_pos = NULL;
1033         struct vme_error_handler *handler;
1034         int handler_triggered = 0;
1035         u32 aspace = vme_get_aspace(am);
1036
1037         list_for_each(handler_pos, &bridge->vme_error_handlers) {
1038                 handler = list_entry(handler_pos, struct vme_error_handler,
1039                                      list);
1040                 if ((aspace == handler->aspace) &&
1041                     (address >= handler->start) &&
1042                     (address < handler->end)) {
1043                         if (!handler->num_errors)
1044                                 handler->first_error = address;
1045                         if (handler->num_errors != UINT_MAX)
1046                                 handler->num_errors++;
1047                         handler_triggered = 1;
1048                 }
1049         }
1050
1051         if (!handler_triggered)
1052                 dev_err(bridge->parent,
1053                         "Unhandled VME access error at address 0x%llx\n",
1054                         address);
1055 }
1056 EXPORT_SYMBOL(vme_bus_error_handler);
1057
1058 struct vme_error_handler *vme_register_error_handler(
1059         struct vme_bridge *bridge, u32 aspace,
1060         unsigned long long address, size_t len)
1061 {
1062         struct vme_error_handler *handler;
1063
1064         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
1065         if (!handler)
1066                 return NULL;
1067
1068         handler->aspace = aspace;
1069         handler->start = address;
1070         handler->end = address + len;
1071         handler->num_errors = 0;
1072         handler->first_error = 0;
1073         list_add_tail(&handler->list, &bridge->vme_error_handlers);
1074
1075         return handler;
1076 }
1077 EXPORT_SYMBOL(vme_register_error_handler);
1078
1079 void vme_unregister_error_handler(struct vme_error_handler *handler)
1080 {
1081         list_del(&handler->list);
1082         kfree(handler);
1083 }
1084 EXPORT_SYMBOL(vme_unregister_error_handler);
1085
1086 void vme_irq_handler(struct vme_bridge *bridge, int level, int statid)
1087 {
1088         void (*call)(int, int, void *);
1089         void *priv_data;
1090
1091         call = bridge->irq[level - 1].callback[statid].func;
1092         priv_data = bridge->irq[level - 1].callback[statid].priv_data;
1093
1094         if (call != NULL)
1095                 call(level, statid, priv_data);
1096         else
1097                 printk(KERN_WARNING "Spurious VME interrupt, level:%x, vector:%x\n",
1098                        level, statid);
1099 }
1100 EXPORT_SYMBOL(vme_irq_handler);
1101
1102 int vme_irq_request(struct vme_dev *vdev, int level, int statid,
1103         void (*callback)(int, int, void *),
1104         void *priv_data)
1105 {
1106         struct vme_bridge *bridge;
1107
1108         bridge = vdev->bridge;
1109         if (bridge == NULL) {
1110                 printk(KERN_ERR "Can't find VME bus\n");
1111                 return -EINVAL;
1112         }
1113
1114         if ((level < 1) || (level > 7)) {
1115                 printk(KERN_ERR "Invalid interrupt level\n");
1116                 return -EINVAL;
1117         }
1118
1119         if (bridge->irq_set == NULL) {
1120                 printk(KERN_ERR "Configuring interrupts not supported\n");
1121                 return -EINVAL;
1122         }
1123
1124         mutex_lock(&bridge->irq_mtx);
1125
1126         if (bridge->irq[level - 1].callback[statid].func) {
1127                 mutex_unlock(&bridge->irq_mtx);
1128                 printk(KERN_WARNING "VME Interrupt already taken\n");
1129                 return -EBUSY;
1130         }
1131
1132         bridge->irq[level - 1].count++;
1133         bridge->irq[level - 1].callback[statid].priv_data = priv_data;
1134         bridge->irq[level - 1].callback[statid].func = callback;
1135
1136         /* Enable IRQ level */
1137         bridge->irq_set(bridge, level, 1, 1);
1138
1139         mutex_unlock(&bridge->irq_mtx);
1140
1141         return 0;
1142 }
1143 EXPORT_SYMBOL(vme_irq_request);
1144
1145 void vme_irq_free(struct vme_dev *vdev, int level, int statid)
1146 {
1147         struct vme_bridge *bridge;
1148
1149         bridge = vdev->bridge;
1150         if (bridge == NULL) {
1151                 printk(KERN_ERR "Can't find VME bus\n");
1152                 return;
1153         }
1154
1155         if ((level < 1) || (level > 7)) {
1156                 printk(KERN_ERR "Invalid interrupt level\n");
1157                 return;
1158         }
1159
1160         if (bridge->irq_set == NULL) {
1161                 printk(KERN_ERR "Configuring interrupts not supported\n");
1162                 return;
1163         }
1164
1165         mutex_lock(&bridge->irq_mtx);
1166
1167         bridge->irq[level - 1].count--;
1168
1169         /* Disable IRQ level if no more interrupts attached at this level*/
1170         if (bridge->irq[level - 1].count == 0)
1171                 bridge->irq_set(bridge, level, 0, 1);
1172
1173         bridge->irq[level - 1].callback[statid].func = NULL;
1174         bridge->irq[level - 1].callback[statid].priv_data = NULL;
1175
1176         mutex_unlock(&bridge->irq_mtx);
1177 }
1178 EXPORT_SYMBOL(vme_irq_free);
1179
1180 int vme_irq_generate(struct vme_dev *vdev, int level, int statid)
1181 {
1182         struct vme_bridge *bridge;
1183
1184         bridge = vdev->bridge;
1185         if (bridge == NULL) {
1186                 printk(KERN_ERR "Can't find VME bus\n");
1187                 return -EINVAL;
1188         }
1189
1190         if ((level < 1) || (level > 7)) {
1191                 printk(KERN_WARNING "Invalid interrupt level\n");
1192                 return -EINVAL;
1193         }
1194
1195         if (bridge->irq_generate == NULL) {
1196                 printk(KERN_WARNING "Interrupt generation not supported\n");
1197                 return -EINVAL;
1198         }
1199
1200         return bridge->irq_generate(bridge, level, statid);
1201 }
1202 EXPORT_SYMBOL(vme_irq_generate);
1203
1204 /*
1205  * Request the location monitor, return resource or NULL
1206  */
1207 struct vme_resource *vme_lm_request(struct vme_dev *vdev)
1208 {
1209         struct vme_bridge *bridge;
1210         struct list_head *lm_pos = NULL;
1211         struct vme_lm_resource *allocated_lm = NULL;
1212         struct vme_lm_resource *lm = NULL;
1213         struct vme_resource *resource = NULL;
1214
1215         bridge = vdev->bridge;
1216         if (bridge == NULL) {
1217                 printk(KERN_ERR "Can't find VME bus\n");
1218                 goto err_bus;
1219         }
1220
1221         /* Loop through DMA resources */
1222         list_for_each(lm_pos, &bridge->lm_resources) {
1223                 lm = list_entry(lm_pos,
1224                         struct vme_lm_resource, list);
1225
1226                 if (lm == NULL) {
1227                         printk(KERN_ERR "Registered NULL Location Monitor resource\n");
1228                         continue;
1229                 }
1230
1231                 /* Find an unlocked controller */
1232                 mutex_lock(&lm->mtx);
1233                 if (lm->locked == 0) {
1234                         lm->locked = 1;
1235                         mutex_unlock(&lm->mtx);
1236                         allocated_lm = lm;
1237                         break;
1238                 }
1239                 mutex_unlock(&lm->mtx);
1240         }
1241
1242         /* Check to see if we found a resource */
1243         if (allocated_lm == NULL)
1244                 goto err_lm;
1245
1246         resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL);
1247         if (resource == NULL) {
1248                 printk(KERN_ERR "Unable to allocate resource structure\n");
1249                 goto err_alloc;
1250         }
1251         resource->type = VME_LM;
1252         resource->entry = &allocated_lm->list;
1253
1254         return resource;
1255
1256 err_alloc:
1257         /* Unlock image */
1258         mutex_lock(&lm->mtx);
1259         lm->locked = 0;
1260         mutex_unlock(&lm->mtx);
1261 err_lm:
1262 err_bus:
1263         return NULL;
1264 }
1265 EXPORT_SYMBOL(vme_lm_request);
1266
1267 int vme_lm_count(struct vme_resource *resource)
1268 {
1269         struct vme_lm_resource *lm;
1270
1271         if (resource->type != VME_LM) {
1272                 printk(KERN_ERR "Not a Location Monitor resource\n");
1273                 return -EINVAL;
1274         }
1275
1276         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1277
1278         return lm->monitors;
1279 }
1280 EXPORT_SYMBOL(vme_lm_count);
1281
1282 int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base,
1283         u32 aspace, u32 cycle)
1284 {
1285         struct vme_bridge *bridge = find_bridge(resource);
1286         struct vme_lm_resource *lm;
1287
1288         if (resource->type != VME_LM) {
1289                 printk(KERN_ERR "Not a Location Monitor resource\n");
1290                 return -EINVAL;
1291         }
1292
1293         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1294
1295         if (bridge->lm_set == NULL) {
1296                 printk(KERN_ERR "vme_lm_set not supported\n");
1297                 return -EINVAL;
1298         }
1299
1300         return bridge->lm_set(lm, lm_base, aspace, cycle);
1301 }
1302 EXPORT_SYMBOL(vme_lm_set);
1303
1304 int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base,
1305         u32 *aspace, u32 *cycle)
1306 {
1307         struct vme_bridge *bridge = find_bridge(resource);
1308         struct vme_lm_resource *lm;
1309
1310         if (resource->type != VME_LM) {
1311                 printk(KERN_ERR "Not a Location Monitor resource\n");
1312                 return -EINVAL;
1313         }
1314
1315         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1316
1317         if (bridge->lm_get == NULL) {
1318                 printk(KERN_ERR "vme_lm_get not supported\n");
1319                 return -EINVAL;
1320         }
1321
1322         return bridge->lm_get(lm, lm_base, aspace, cycle);
1323 }
1324 EXPORT_SYMBOL(vme_lm_get);
1325
1326 int vme_lm_attach(struct vme_resource *resource, int monitor,
1327         void (*callback)(void *), void *data)
1328 {
1329         struct vme_bridge *bridge = find_bridge(resource);
1330         struct vme_lm_resource *lm;
1331
1332         if (resource->type != VME_LM) {
1333                 printk(KERN_ERR "Not a Location Monitor resource\n");
1334                 return -EINVAL;
1335         }
1336
1337         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1338
1339         if (bridge->lm_attach == NULL) {
1340                 printk(KERN_ERR "vme_lm_attach not supported\n");
1341                 return -EINVAL;
1342         }
1343
1344         return bridge->lm_attach(lm, monitor, callback, data);
1345 }
1346 EXPORT_SYMBOL(vme_lm_attach);
1347
1348 int vme_lm_detach(struct vme_resource *resource, int monitor)
1349 {
1350         struct vme_bridge *bridge = find_bridge(resource);
1351         struct vme_lm_resource *lm;
1352
1353         if (resource->type != VME_LM) {
1354                 printk(KERN_ERR "Not a Location Monitor resource\n");
1355                 return -EINVAL;
1356         }
1357
1358         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1359
1360         if (bridge->lm_detach == NULL) {
1361                 printk(KERN_ERR "vme_lm_detach not supported\n");
1362                 return -EINVAL;
1363         }
1364
1365         return bridge->lm_detach(lm, monitor);
1366 }
1367 EXPORT_SYMBOL(vme_lm_detach);
1368
1369 void vme_lm_free(struct vme_resource *resource)
1370 {
1371         struct vme_lm_resource *lm;
1372
1373         if (resource->type != VME_LM) {
1374                 printk(KERN_ERR "Not a Location Monitor resource\n");
1375                 return;
1376         }
1377
1378         lm = list_entry(resource->entry, struct vme_lm_resource, list);
1379
1380         mutex_lock(&lm->mtx);
1381
1382         /* XXX
1383          * Check to see that there aren't any callbacks still attached, if
1384          * there are we should probably be detaching them!
1385          */
1386
1387         lm->locked = 0;
1388
1389         mutex_unlock(&lm->mtx);
1390
1391         kfree(resource);
1392 }
1393 EXPORT_SYMBOL(vme_lm_free);
1394
1395 int vme_slot_num(struct vme_dev *vdev)
1396 {
1397         struct vme_bridge *bridge;
1398
1399         bridge = vdev->bridge;
1400         if (bridge == NULL) {
1401                 printk(KERN_ERR "Can't find VME bus\n");
1402                 return -EINVAL;
1403         }
1404
1405         if (bridge->slot_get == NULL) {
1406                 printk(KERN_WARNING "vme_slot_num not supported\n");
1407                 return -EINVAL;
1408         }
1409
1410         return bridge->slot_get(bridge);
1411 }
1412 EXPORT_SYMBOL(vme_slot_num);
1413
1414 int vme_bus_num(struct vme_dev *vdev)
1415 {
1416         struct vme_bridge *bridge;
1417
1418         bridge = vdev->bridge;
1419         if (bridge == NULL) {
1420                 pr_err("Can't find VME bus\n");
1421                 return -EINVAL;
1422         }
1423
1424         return bridge->num;
1425 }
1426 EXPORT_SYMBOL(vme_bus_num);
1427
1428 /* - Bridge Registration --------------------------------------------------- */
1429
1430 static void vme_dev_release(struct device *dev)
1431 {
1432         kfree(dev_to_vme_dev(dev));
1433 }
1434
1435 /* Common bridge initialization */
1436 struct vme_bridge *vme_init_bridge(struct vme_bridge *bridge)
1437 {
1438         INIT_LIST_HEAD(&bridge->vme_error_handlers);
1439         INIT_LIST_HEAD(&bridge->master_resources);
1440         INIT_LIST_HEAD(&bridge->slave_resources);
1441         INIT_LIST_HEAD(&bridge->dma_resources);
1442         INIT_LIST_HEAD(&bridge->lm_resources);
1443         mutex_init(&bridge->irq_mtx);
1444
1445         return bridge;
1446 }
1447 EXPORT_SYMBOL(vme_init_bridge);
1448
1449 int vme_register_bridge(struct vme_bridge *bridge)
1450 {
1451         int i;
1452         int ret = -1;
1453
1454         mutex_lock(&vme_buses_lock);
1455         for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
1456                 if ((vme_bus_numbers & (1 << i)) == 0) {
1457                         vme_bus_numbers |= (1 << i);
1458                         bridge->num = i;
1459                         INIT_LIST_HEAD(&bridge->devices);
1460                         list_add_tail(&bridge->bus_list, &vme_bus_list);
1461                         ret = 0;
1462                         break;
1463                 }
1464         }
1465         mutex_unlock(&vme_buses_lock);
1466
1467         return ret;
1468 }
1469 EXPORT_SYMBOL(vme_register_bridge);
1470
1471 void vme_unregister_bridge(struct vme_bridge *bridge)
1472 {
1473         struct vme_dev *vdev;
1474         struct vme_dev *tmp;
1475
1476         mutex_lock(&vme_buses_lock);
1477         vme_bus_numbers &= ~(1 << bridge->num);
1478         list_for_each_entry_safe(vdev, tmp, &bridge->devices, bridge_list) {
1479                 list_del(&vdev->drv_list);
1480                 list_del(&vdev->bridge_list);
1481                 device_unregister(&vdev->dev);
1482         }
1483         list_del(&bridge->bus_list);
1484         mutex_unlock(&vme_buses_lock);
1485 }
1486 EXPORT_SYMBOL(vme_unregister_bridge);
1487
1488 /* - Driver Registration --------------------------------------------------- */
1489
1490 static int __vme_register_driver_bus(struct vme_driver *drv,
1491         struct vme_bridge *bridge, unsigned int ndevs)
1492 {
1493         int err;
1494         unsigned int i;
1495         struct vme_dev *vdev;
1496         struct vme_dev *tmp;
1497
1498         for (i = 0; i < ndevs; i++) {
1499                 vdev = kzalloc(sizeof(struct vme_dev), GFP_KERNEL);
1500                 if (!vdev) {
1501                         err = -ENOMEM;
1502                         goto err_devalloc;
1503                 }
1504                 vdev->num = i;
1505                 vdev->bridge = bridge;
1506                 vdev->dev.platform_data = drv;
1507                 vdev->dev.release = vme_dev_release;
1508                 vdev->dev.parent = bridge->parent;
1509                 vdev->dev.bus = &vme_bus_type;
1510                 dev_set_name(&vdev->dev, "%s.%u-%u", drv->name, bridge->num,
1511                         vdev->num);
1512
1513                 err = device_register(&vdev->dev);
1514                 if (err)
1515                         goto err_reg;
1516
1517                 if (vdev->dev.platform_data) {
1518                         list_add_tail(&vdev->drv_list, &drv->devices);
1519                         list_add_tail(&vdev->bridge_list, &bridge->devices);
1520                 } else
1521                         device_unregister(&vdev->dev);
1522         }
1523         return 0;
1524
1525 err_reg:
1526         put_device(&vdev->dev);
1527         kfree(vdev);
1528 err_devalloc:
1529         list_for_each_entry_safe(vdev, tmp, &drv->devices, drv_list) {
1530                 list_del(&vdev->drv_list);
1531                 list_del(&vdev->bridge_list);
1532                 device_unregister(&vdev->dev);
1533         }
1534         return err;
1535 }
1536
1537 static int __vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
1538 {
1539         struct vme_bridge *bridge;
1540         int err = 0;
1541
1542         mutex_lock(&vme_buses_lock);
1543         list_for_each_entry(bridge, &vme_bus_list, bus_list) {
1544                 /*
1545                  * This cannot cause trouble as we already have vme_buses_lock
1546                  * and if the bridge is removed, it will have to go through
1547                  * vme_unregister_bridge() to do it (which calls remove() on
1548                  * the bridge which in turn tries to acquire vme_buses_lock and
1549                  * will have to wait).
1550                  */
1551                 err = __vme_register_driver_bus(drv, bridge, ndevs);
1552                 if (err)
1553                         break;
1554         }
1555         mutex_unlock(&vme_buses_lock);
1556         return err;
1557 }
1558
1559 int vme_register_driver(struct vme_driver *drv, unsigned int ndevs)
1560 {
1561         int err;
1562
1563         drv->driver.name = drv->name;
1564         drv->driver.bus = &vme_bus_type;
1565         INIT_LIST_HEAD(&drv->devices);
1566
1567         err = driver_register(&drv->driver);
1568         if (err)
1569                 return err;
1570
1571         err = __vme_register_driver(drv, ndevs);
1572         if (err)
1573                 driver_unregister(&drv->driver);
1574
1575         return err;
1576 }
1577 EXPORT_SYMBOL(vme_register_driver);
1578
1579 void vme_unregister_driver(struct vme_driver *drv)
1580 {
1581         struct vme_dev *dev, *dev_tmp;
1582
1583         mutex_lock(&vme_buses_lock);
1584         list_for_each_entry_safe(dev, dev_tmp, &drv->devices, drv_list) {
1585                 list_del(&dev->drv_list);
1586                 list_del(&dev->bridge_list);
1587                 device_unregister(&dev->dev);
1588         }
1589         mutex_unlock(&vme_buses_lock);
1590
1591         driver_unregister(&drv->driver);
1592 }
1593 EXPORT_SYMBOL(vme_unregister_driver);
1594
1595 /* - Bus Registration ------------------------------------------------------ */
1596
1597 static int vme_bus_match(struct device *dev, struct device_driver *drv)
1598 {
1599         struct vme_driver *vme_drv;
1600
1601         vme_drv = container_of(drv, struct vme_driver, driver);
1602
1603         if (dev->platform_data == vme_drv) {
1604                 struct vme_dev *vdev = dev_to_vme_dev(dev);
1605
1606                 if (vme_drv->match && vme_drv->match(vdev))
1607                         return 1;
1608
1609                 dev->platform_data = NULL;
1610         }
1611         return 0;
1612 }
1613
1614 static int vme_bus_probe(struct device *dev)
1615 {
1616         int retval = -ENODEV;
1617         struct vme_driver *driver;
1618         struct vme_dev *vdev = dev_to_vme_dev(dev);
1619
1620         driver = dev->platform_data;
1621
1622         if (driver->probe != NULL)
1623                 retval = driver->probe(vdev);
1624
1625         return retval;
1626 }
1627
1628 struct bus_type vme_bus_type = {
1629         .name = "vme",
1630         .match = vme_bus_match,
1631         .probe = vme_bus_probe,
1632 };
1633 EXPORT_SYMBOL(vme_bus_type);
1634
1635 static int __init vme_init(void)
1636 {
1637         return bus_register(&vme_bus_type);
1638 }
1639 subsys_initcall(vme_init);