Martyn Welch | a17a75e | 2009-07-31 09:28:17 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * VME Bridge Framework |
| 3 | * |
| 4 | * Author: Martyn Welch <martyn.welch@gefanuc.com> |
| 5 | * Copyright 2008 GE Fanuc Intelligent Platforms Embedded Systems, Inc. |
| 6 | * |
| 7 | * Based on work by Tom Armistead and Ajit Prem |
| 8 | * Copyright 2004 Motorola Inc. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify it |
| 11 | * under the terms of the GNU General Public License as published by the |
| 12 | * Free Software Foundation; either version 2 of the License, or (at your |
| 13 | * option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/version.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/moduleparam.h> |
| 19 | #include <linux/mm.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/errno.h> |
| 23 | #include <linux/pci.h> |
| 24 | #include <linux/poll.h> |
| 25 | #include <linux/highmem.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | #include <linux/pagemap.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/dma-mapping.h> |
| 30 | #include <linux/syscalls.h> |
| 31 | #include <linux/semaphore.h> |
| 32 | #include <linux/spinlock.h> |
| 33 | |
| 34 | #include "vme.h" |
| 35 | #include "vme_bridge.h" |
| 36 | |
| 37 | /* Bitmask and semaphore to keep track of bridge numbers */ |
| 38 | static unsigned int vme_bus_numbers; |
| 39 | DECLARE_MUTEX(vme_bus_num_sem); |
| 40 | |
| 41 | static void __exit vme_exit (void); |
| 42 | static int __init vme_init (void); |
| 43 | |
| 44 | |
| 45 | /* |
| 46 | * Find the bridge resource associated with a specific device resource |
| 47 | */ |
| 48 | static struct vme_bridge *dev_to_bridge(struct device *dev) |
| 49 | { |
| 50 | return dev->platform_data; |
| 51 | } |
| 52 | |
| 53 | /* |
| 54 | * Find the bridge that the resource is associated with. |
| 55 | */ |
| 56 | static struct vme_bridge *find_bridge(struct vme_resource *resource) |
| 57 | { |
| 58 | /* Get list to search */ |
| 59 | switch (resource->type) { |
| 60 | case VME_MASTER: |
| 61 | return list_entry(resource->entry, struct vme_master_resource, |
| 62 | list)->parent; |
| 63 | break; |
| 64 | case VME_SLAVE: |
| 65 | return list_entry(resource->entry, struct vme_slave_resource, |
| 66 | list)->parent; |
| 67 | break; |
| 68 | case VME_DMA: |
| 69 | return list_entry(resource->entry, struct vme_dma_resource, |
| 70 | list)->parent; |
| 71 | break; |
| 72 | 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 | * XXX VME bridges could be available on buses other than PCI. At the momment |
| 84 | * this framework only supports PCI devices. |
| 85 | */ |
| 86 | void * vme_alloc_consistent(struct vme_resource *resource, size_t size, |
| 87 | dma_addr_t *dma) |
| 88 | { |
| 89 | struct vme_bridge *bridge; |
| 90 | struct pci_dev *pdev; |
| 91 | |
| 92 | if(resource == NULL) { |
| 93 | printk("No resource\n"); |
| 94 | return NULL; |
| 95 | } |
| 96 | |
| 97 | bridge = find_bridge(resource); |
| 98 | if(bridge == NULL) { |
| 99 | printk("Can't find bridge\n"); |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | /* Find pci_dev container of dev */ |
| 104 | if (bridge->parent == NULL) { |
| 105 | printk("Dev entry NULL\n"); |
| 106 | return NULL; |
| 107 | } |
| 108 | pdev = container_of(bridge->parent, struct pci_dev, dev); |
| 109 | |
| 110 | return pci_alloc_consistent(pdev, size, dma); |
| 111 | } |
| 112 | EXPORT_SYMBOL(vme_alloc_consistent); |
| 113 | |
| 114 | /* |
| 115 | * Free previously allocated contiguous block of memory. |
| 116 | * |
| 117 | * XXX VME bridges could be available on buses other than PCI. At the momment |
| 118 | * this framework only supports PCI devices. |
| 119 | */ |
| 120 | void vme_free_consistent(struct vme_resource *resource, size_t size, |
| 121 | void *vaddr, dma_addr_t dma) |
| 122 | { |
| 123 | struct vme_bridge *bridge; |
| 124 | struct pci_dev *pdev; |
| 125 | |
| 126 | if(resource == NULL) { |
| 127 | printk("No resource\n"); |
| 128 | return; |
| 129 | } |
| 130 | |
| 131 | bridge = find_bridge(resource); |
| 132 | if(bridge == NULL) { |
| 133 | printk("Can't find bridge\n"); |
| 134 | return; |
| 135 | } |
| 136 | |
| 137 | /* Find pci_dev container of dev */ |
| 138 | pdev = container_of(bridge->parent, struct pci_dev, dev); |
| 139 | |
| 140 | pci_free_consistent(pdev, size, vaddr, dma); |
| 141 | } |
| 142 | EXPORT_SYMBOL(vme_free_consistent); |
| 143 | |
| 144 | size_t vme_get_size(struct vme_resource *resource) |
| 145 | { |
| 146 | int enabled, retval; |
| 147 | unsigned long long base, size; |
| 148 | dma_addr_t buf_base; |
| 149 | vme_address_t aspace; |
| 150 | vme_cycle_t cycle; |
| 151 | vme_width_t dwidth; |
| 152 | |
| 153 | switch (resource->type) { |
| 154 | case VME_MASTER: |
| 155 | retval = vme_master_get(resource, &enabled, &base, &size, |
| 156 | &aspace, &cycle, &dwidth); |
| 157 | |
| 158 | return size; |
| 159 | break; |
| 160 | case VME_SLAVE: |
| 161 | retval = vme_slave_get(resource, &enabled, &base, &size, |
| 162 | &buf_base, &aspace, &cycle); |
| 163 | |
| 164 | return size; |
| 165 | break; |
| 166 | case VME_DMA: |
| 167 | return 0; |
| 168 | break; |
| 169 | default: |
| 170 | printk(KERN_ERR "Unknown resource type\n"); |
| 171 | return 0; |
| 172 | break; |
| 173 | } |
| 174 | } |
| 175 | EXPORT_SYMBOL(vme_get_size); |
| 176 | |
| 177 | static int vme_check_window(vme_address_t aspace, unsigned long long vme_base, |
| 178 | unsigned long long size) |
| 179 | { |
| 180 | int retval = 0; |
| 181 | |
| 182 | switch (aspace) { |
| 183 | case VME_A16: |
| 184 | if (((vme_base + size) > VME_A16_MAX) || |
| 185 | (vme_base > VME_A16_MAX)) |
| 186 | retval = -EFAULT; |
| 187 | break; |
| 188 | case VME_A24: |
| 189 | if (((vme_base + size) > VME_A24_MAX) || |
| 190 | (vme_base > VME_A24_MAX)) |
| 191 | retval = -EFAULT; |
| 192 | break; |
| 193 | case VME_A32: |
| 194 | if (((vme_base + size) > VME_A32_MAX) || |
| 195 | (vme_base > VME_A32_MAX)) |
| 196 | retval = -EFAULT; |
| 197 | break; |
| 198 | case VME_A64: |
| 199 | /* |
| 200 | * Any value held in an unsigned long long can be used as the |
| 201 | * base |
| 202 | */ |
| 203 | break; |
| 204 | case VME_CRCSR: |
| 205 | if (((vme_base + size) > VME_CRCSR_MAX) || |
| 206 | (vme_base > VME_CRCSR_MAX)) |
| 207 | retval = -EFAULT; |
| 208 | break; |
| 209 | case VME_USER1: |
| 210 | case VME_USER2: |
| 211 | case VME_USER3: |
| 212 | case VME_USER4: |
| 213 | /* User Defined */ |
| 214 | break; |
| 215 | default: |
| 216 | printk("Invalid address space\n"); |
| 217 | retval = -EINVAL; |
| 218 | break; |
| 219 | } |
| 220 | |
| 221 | return retval; |
| 222 | } |
| 223 | |
| 224 | /* |
| 225 | * Request a slave image with specific attributes, return some unique |
| 226 | * identifier. |
| 227 | */ |
| 228 | struct vme_resource * vme_slave_request(struct device *dev, |
| 229 | vme_address_t address, vme_cycle_t cycle) |
| 230 | { |
| 231 | struct vme_bridge *bridge; |
| 232 | struct list_head *slave_pos = NULL; |
| 233 | struct vme_slave_resource *allocated_image = NULL; |
| 234 | struct vme_slave_resource *slave_image = NULL; |
| 235 | struct vme_resource *resource = NULL; |
| 236 | |
| 237 | bridge = dev_to_bridge(dev); |
| 238 | if (bridge == NULL) { |
| 239 | printk(KERN_ERR "Can't find VME bus\n"); |
| 240 | goto err_bus; |
| 241 | } |
| 242 | |
| 243 | /* Loop through slave resources */ |
| 244 | list_for_each(slave_pos, &(bridge->slave_resources)) { |
| 245 | slave_image = list_entry(slave_pos, |
| 246 | struct vme_slave_resource, list); |
| 247 | |
| 248 | if (slave_image == NULL) { |
| 249 | printk("Registered NULL Slave resource\n"); |
| 250 | continue; |
| 251 | } |
| 252 | |
| 253 | /* Find an unlocked and compatible image */ |
| 254 | down(&(slave_image->sem)); |
| 255 | if(((slave_image->address_attr & address) == address) && |
| 256 | ((slave_image->cycle_attr & cycle) == cycle) && |
| 257 | (slave_image->locked == 0)) { |
| 258 | |
| 259 | slave_image->locked = 1; |
| 260 | up(&(slave_image->sem)); |
| 261 | allocated_image = slave_image; |
| 262 | break; |
| 263 | } |
| 264 | up(&(slave_image->sem)); |
| 265 | } |
| 266 | |
| 267 | /* No free image */ |
| 268 | if (allocated_image == NULL) |
| 269 | goto err_image; |
| 270 | |
| 271 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); |
| 272 | if (resource == NULL) { |
| 273 | printk(KERN_WARNING "Unable to allocate resource structure\n"); |
| 274 | goto err_alloc; |
| 275 | } |
| 276 | resource->type = VME_SLAVE; |
| 277 | resource->entry = &(allocated_image->list); |
| 278 | |
| 279 | return resource; |
| 280 | |
| 281 | err_alloc: |
| 282 | /* Unlock image */ |
| 283 | down(&(slave_image->sem)); |
| 284 | slave_image->locked = 0; |
| 285 | up(&(slave_image->sem)); |
| 286 | err_image: |
| 287 | err_bus: |
| 288 | return NULL; |
| 289 | } |
| 290 | EXPORT_SYMBOL(vme_slave_request); |
| 291 | |
| 292 | int vme_slave_set (struct vme_resource *resource, int enabled, |
| 293 | unsigned long long vme_base, unsigned long long size, |
| 294 | dma_addr_t buf_base, vme_address_t aspace, vme_cycle_t cycle) |
| 295 | { |
| 296 | struct vme_bridge *bridge = find_bridge(resource); |
| 297 | struct vme_slave_resource *image; |
| 298 | int retval; |
| 299 | |
| 300 | if (resource->type != VME_SLAVE) { |
| 301 | printk("Not a slave resource\n"); |
| 302 | return -EINVAL; |
| 303 | } |
| 304 | |
| 305 | image = list_entry(resource->entry, struct vme_slave_resource, list); |
| 306 | |
| 307 | if (bridge->slave_set == NULL) { |
| 308 | printk("Function not supported\n"); |
| 309 | return -ENOSYS; |
| 310 | } |
| 311 | |
| 312 | if(!(((image->address_attr & aspace) == aspace) && |
| 313 | ((image->cycle_attr & cycle) == cycle))) { |
| 314 | printk("Invalid attributes\n"); |
| 315 | return -EINVAL; |
| 316 | } |
| 317 | |
| 318 | retval = vme_check_window(aspace, vme_base, size); |
| 319 | if(retval) |
| 320 | return retval; |
| 321 | |
| 322 | return bridge->slave_set(image, enabled, vme_base, size, buf_base, |
| 323 | aspace, cycle); |
| 324 | } |
| 325 | EXPORT_SYMBOL(vme_slave_set); |
| 326 | |
| 327 | int vme_slave_get (struct vme_resource *resource, int *enabled, |
| 328 | unsigned long long *vme_base, unsigned long long *size, |
| 329 | dma_addr_t *buf_base, vme_address_t *aspace, vme_cycle_t *cycle) |
| 330 | { |
| 331 | struct vme_bridge *bridge = find_bridge(resource); |
| 332 | struct vme_slave_resource *image; |
| 333 | |
| 334 | if (resource->type != VME_SLAVE) { |
| 335 | printk("Not a slave resource\n"); |
| 336 | return -EINVAL; |
| 337 | } |
| 338 | |
| 339 | image = list_entry(resource->entry, struct vme_slave_resource, list); |
| 340 | |
| 341 | if (bridge->slave_set == NULL) { |
| 342 | printk("vme_slave_get not supported\n"); |
| 343 | return -EINVAL; |
| 344 | } |
| 345 | |
| 346 | return bridge->slave_get(image, enabled, vme_base, size, buf_base, |
| 347 | aspace, cycle); |
| 348 | } |
| 349 | EXPORT_SYMBOL(vme_slave_get); |
| 350 | |
| 351 | void vme_slave_free(struct vme_resource *resource) |
| 352 | { |
| 353 | struct vme_slave_resource *slave_image; |
| 354 | |
| 355 | if (resource->type != VME_SLAVE) { |
| 356 | printk("Not a slave resource\n"); |
| 357 | return; |
| 358 | } |
| 359 | |
| 360 | slave_image = list_entry(resource->entry, struct vme_slave_resource, |
| 361 | list); |
| 362 | if (slave_image == NULL) { |
| 363 | printk("Can't find slave resource\n"); |
| 364 | return; |
| 365 | } |
| 366 | |
| 367 | /* Unlock image */ |
| 368 | down(&(slave_image->sem)); |
| 369 | if (slave_image->locked == 0) |
| 370 | printk(KERN_ERR "Image is already free\n"); |
| 371 | |
| 372 | slave_image->locked = 0; |
| 373 | up(&(slave_image->sem)); |
| 374 | |
| 375 | /* Free up resource memory */ |
| 376 | kfree(resource); |
| 377 | } |
| 378 | EXPORT_SYMBOL(vme_slave_free); |
| 379 | |
| 380 | /* |
| 381 | * Request a master image with specific attributes, return some unique |
| 382 | * identifier. |
| 383 | */ |
| 384 | struct vme_resource * vme_master_request(struct device *dev, |
| 385 | vme_address_t address, vme_cycle_t cycle, vme_width_t dwidth) |
| 386 | { |
| 387 | struct vme_bridge *bridge; |
| 388 | struct list_head *master_pos = NULL; |
| 389 | struct vme_master_resource *allocated_image = NULL; |
| 390 | struct vme_master_resource *master_image = NULL; |
| 391 | struct vme_resource *resource = NULL; |
| 392 | |
| 393 | bridge = dev_to_bridge(dev); |
| 394 | if (bridge == NULL) { |
| 395 | printk(KERN_ERR "Can't find VME bus\n"); |
| 396 | goto err_bus; |
| 397 | } |
| 398 | |
| 399 | /* Loop through master resources */ |
| 400 | list_for_each(master_pos, &(bridge->master_resources)) { |
| 401 | master_image = list_entry(master_pos, |
| 402 | struct vme_master_resource, list); |
| 403 | |
| 404 | if (master_image == NULL) { |
| 405 | printk(KERN_WARNING "Registered NULL master resource\n"); |
| 406 | continue; |
| 407 | } |
| 408 | |
| 409 | /* Find an unlocked and compatible image */ |
| 410 | spin_lock(&(master_image->lock)); |
| 411 | if(((master_image->address_attr & address) == address) && |
| 412 | ((master_image->cycle_attr & cycle) == cycle) && |
| 413 | ((master_image->width_attr & dwidth) == dwidth) && |
| 414 | (master_image->locked == 0)) { |
| 415 | |
| 416 | master_image->locked = 1; |
| 417 | spin_unlock(&(master_image->lock)); |
| 418 | allocated_image = master_image; |
| 419 | break; |
| 420 | } |
| 421 | spin_unlock(&(master_image->lock)); |
| 422 | } |
| 423 | |
| 424 | /* Check to see if we found a resource */ |
| 425 | if (allocated_image == NULL) { |
| 426 | printk(KERN_ERR "Can't find a suitable resource\n"); |
| 427 | goto err_image; |
| 428 | } |
| 429 | |
| 430 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); |
| 431 | if (resource == NULL) { |
| 432 | printk(KERN_ERR "Unable to allocate resource structure\n"); |
| 433 | goto err_alloc; |
| 434 | } |
| 435 | resource->type = VME_MASTER; |
| 436 | resource->entry = &(allocated_image->list); |
| 437 | |
| 438 | return resource; |
| 439 | |
| 440 | kfree(resource); |
| 441 | err_alloc: |
| 442 | /* Unlock image */ |
| 443 | spin_lock(&(master_image->lock)); |
| 444 | master_image->locked = 0; |
| 445 | spin_unlock(&(master_image->lock)); |
| 446 | err_image: |
| 447 | err_bus: |
| 448 | return NULL; |
| 449 | } |
| 450 | EXPORT_SYMBOL(vme_master_request); |
| 451 | |
| 452 | int vme_master_set (struct vme_resource *resource, int enabled, |
| 453 | unsigned long long vme_base, unsigned long long size, |
| 454 | vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth) |
| 455 | { |
| 456 | struct vme_bridge *bridge = find_bridge(resource); |
| 457 | struct vme_master_resource *image; |
| 458 | int retval; |
| 459 | |
| 460 | if (resource->type != VME_MASTER) { |
| 461 | printk("Not a master resource\n"); |
| 462 | return -EINVAL; |
| 463 | } |
| 464 | |
| 465 | image = list_entry(resource->entry, struct vme_master_resource, list); |
| 466 | |
| 467 | if (bridge->master_set == NULL) { |
| 468 | printk("vme_master_set not supported\n"); |
| 469 | return -EINVAL; |
| 470 | } |
| 471 | |
| 472 | if(!(((image->address_attr & aspace) == aspace) && |
| 473 | ((image->cycle_attr & cycle) == cycle) && |
| 474 | ((image->width_attr & dwidth) == dwidth))) { |
| 475 | printk("Invalid attributes\n"); |
| 476 | return -EINVAL; |
| 477 | } |
| 478 | |
| 479 | retval = vme_check_window(aspace, vme_base, size); |
| 480 | if(retval) |
| 481 | return retval; |
| 482 | |
| 483 | return bridge->master_set(image, enabled, vme_base, size, aspace, |
| 484 | cycle, dwidth); |
| 485 | } |
| 486 | EXPORT_SYMBOL(vme_master_set); |
| 487 | |
| 488 | int vme_master_get (struct vme_resource *resource, int *enabled, |
| 489 | unsigned long long *vme_base, unsigned long long *size, |
| 490 | vme_address_t *aspace, vme_cycle_t *cycle, vme_width_t *dwidth) |
| 491 | { |
| 492 | struct vme_bridge *bridge = find_bridge(resource); |
| 493 | struct vme_master_resource *image; |
| 494 | |
| 495 | if (resource->type != VME_MASTER) { |
| 496 | printk("Not a master resource\n"); |
| 497 | return -EINVAL; |
| 498 | } |
| 499 | |
| 500 | image = list_entry(resource->entry, struct vme_master_resource, list); |
| 501 | |
| 502 | if (bridge->master_set == NULL) { |
| 503 | printk("vme_master_set not supported\n"); |
| 504 | return -EINVAL; |
| 505 | } |
| 506 | |
| 507 | return bridge->master_get(image, enabled, vme_base, size, aspace, |
| 508 | cycle, dwidth); |
| 509 | } |
| 510 | EXPORT_SYMBOL(vme_master_get); |
| 511 | |
| 512 | /* |
| 513 | * Read data out of VME space into a buffer. |
| 514 | */ |
| 515 | ssize_t vme_master_read (struct vme_resource *resource, void *buf, size_t count, |
| 516 | loff_t offset) |
| 517 | { |
| 518 | struct vme_bridge *bridge = find_bridge(resource); |
| 519 | struct vme_master_resource *image; |
| 520 | size_t length; |
| 521 | |
| 522 | if (bridge->master_read == NULL) { |
| 523 | printk("Reading from resource not supported\n"); |
| 524 | return -EINVAL; |
| 525 | } |
| 526 | |
| 527 | if (resource->type != VME_MASTER) { |
| 528 | printk("Not a master resource\n"); |
| 529 | return -EINVAL; |
| 530 | } |
| 531 | |
| 532 | image = list_entry(resource->entry, struct vme_master_resource, list); |
| 533 | |
| 534 | length = vme_get_size(resource); |
| 535 | |
| 536 | if (offset > length) { |
| 537 | printk("Invalid Offset\n"); |
| 538 | return -EFAULT; |
| 539 | } |
| 540 | |
| 541 | if ((offset + count) > length) |
| 542 | count = length - offset; |
| 543 | |
| 544 | return bridge->master_read(image, buf, count, offset); |
| 545 | |
| 546 | } |
| 547 | EXPORT_SYMBOL(vme_master_read); |
| 548 | |
| 549 | /* |
| 550 | * Write data out to VME space from a buffer. |
| 551 | */ |
| 552 | ssize_t vme_master_write (struct vme_resource *resource, void *buf, |
| 553 | size_t count, 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_write == NULL) { |
| 560 | printk("Writing to resource not supported\n"); |
| 561 | return -EINVAL; |
| 562 | } |
| 563 | |
| 564 | if (resource->type != VME_MASTER) { |
| 565 | printk("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("Invalid Offset\n"); |
| 575 | return -EFAULT; |
| 576 | } |
| 577 | |
| 578 | if ((offset + count) > length) |
| 579 | count = length - offset; |
| 580 | |
| 581 | return bridge->master_write(image, buf, count, offset); |
| 582 | } |
| 583 | EXPORT_SYMBOL(vme_master_write); |
| 584 | |
| 585 | /* |
| 586 | * Perform RMW cycle to provided location. |
| 587 | */ |
| 588 | unsigned int vme_master_rmw (struct vme_resource *resource, unsigned int mask, |
| 589 | unsigned int compare, unsigned int swap, loff_t offset) |
| 590 | { |
| 591 | struct vme_bridge *bridge = find_bridge(resource); |
| 592 | struct vme_master_resource *image; |
| 593 | |
| 594 | if (bridge->master_rmw == NULL) { |
| 595 | printk("Writing to resource not supported\n"); |
| 596 | return -EINVAL; |
| 597 | } |
| 598 | |
| 599 | if (resource->type != VME_MASTER) { |
| 600 | printk("Not a master resource\n"); |
| 601 | return -EINVAL; |
| 602 | } |
| 603 | |
| 604 | image = list_entry(resource->entry, struct vme_master_resource, list); |
| 605 | |
| 606 | return bridge->master_rmw(image, mask, compare, swap, offset); |
| 607 | } |
| 608 | EXPORT_SYMBOL(vme_master_rmw); |
| 609 | |
| 610 | void vme_master_free(struct vme_resource *resource) |
| 611 | { |
| 612 | struct vme_master_resource *master_image; |
| 613 | |
| 614 | if (resource->type != VME_MASTER) { |
| 615 | printk("Not a master resource\n"); |
| 616 | return; |
| 617 | } |
| 618 | |
| 619 | master_image = list_entry(resource->entry, struct vme_master_resource, |
| 620 | list); |
| 621 | if (master_image == NULL) { |
| 622 | printk("Can't find master resource\n"); |
| 623 | return; |
| 624 | } |
| 625 | |
| 626 | /* Unlock image */ |
| 627 | spin_lock(&(master_image->lock)); |
| 628 | if (master_image->locked == 0) |
| 629 | printk(KERN_ERR "Image is already free\n"); |
| 630 | |
| 631 | master_image->locked = 0; |
| 632 | spin_unlock(&(master_image->lock)); |
| 633 | |
| 634 | /* Free up resource memory */ |
| 635 | kfree(resource); |
| 636 | } |
| 637 | EXPORT_SYMBOL(vme_master_free); |
| 638 | |
| 639 | /* |
| 640 | * Request a DMA controller with specific attributes, return some unique |
| 641 | * identifier. |
| 642 | */ |
| 643 | struct vme_resource *vme_request_dma(struct device *dev) |
| 644 | { |
| 645 | struct vme_bridge *bridge; |
| 646 | struct list_head *dma_pos = NULL; |
| 647 | struct vme_dma_resource *allocated_ctrlr = NULL; |
| 648 | struct vme_dma_resource *dma_ctrlr = NULL; |
| 649 | struct vme_resource *resource = NULL; |
| 650 | |
| 651 | /* XXX Not checking resource attributes */ |
| 652 | printk(KERN_ERR "No VME resource Attribute tests done\n"); |
| 653 | |
| 654 | bridge = dev_to_bridge(dev); |
| 655 | if (bridge == NULL) { |
| 656 | printk(KERN_ERR "Can't find VME bus\n"); |
| 657 | goto err_bus; |
| 658 | } |
| 659 | |
| 660 | /* Loop through DMA resources */ |
| 661 | list_for_each(dma_pos, &(bridge->dma_resources)) { |
| 662 | dma_ctrlr = list_entry(dma_pos, |
| 663 | struct vme_dma_resource, list); |
| 664 | |
| 665 | if (dma_ctrlr == NULL) { |
| 666 | printk("Registered NULL DMA resource\n"); |
| 667 | continue; |
| 668 | } |
| 669 | |
| 670 | /* Find an unlocked controller */ |
| 671 | down(&(dma_ctrlr->sem)); |
| 672 | if(dma_ctrlr->locked == 0) { |
| 673 | dma_ctrlr->locked = 1; |
| 674 | up(&(dma_ctrlr->sem)); |
| 675 | allocated_ctrlr = dma_ctrlr; |
| 676 | break; |
| 677 | } |
| 678 | up(&(dma_ctrlr->sem)); |
| 679 | } |
| 680 | |
| 681 | /* Check to see if we found a resource */ |
| 682 | if (allocated_ctrlr == NULL) |
| 683 | goto err_ctrlr; |
| 684 | |
| 685 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); |
| 686 | if (resource == NULL) { |
| 687 | printk(KERN_WARNING "Unable to allocate resource structure\n"); |
| 688 | goto err_alloc; |
| 689 | } |
| 690 | resource->type = VME_DMA; |
| 691 | resource->entry = &(allocated_ctrlr->list); |
| 692 | |
| 693 | return resource; |
| 694 | |
| 695 | err_alloc: |
| 696 | /* Unlock image */ |
| 697 | down(&(dma_ctrlr->sem)); |
| 698 | dma_ctrlr->locked = 0; |
| 699 | up(&(dma_ctrlr->sem)); |
| 700 | err_ctrlr: |
| 701 | err_bus: |
| 702 | return NULL; |
| 703 | } |
| 704 | EXPORT_SYMBOL(vme_request_dma); |
| 705 | |
| 706 | /* |
| 707 | * Start new list |
| 708 | */ |
| 709 | struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource) |
| 710 | { |
| 711 | struct vme_dma_resource *ctrlr; |
| 712 | struct vme_dma_list *dma_list; |
| 713 | |
| 714 | if (resource->type != VME_DMA) { |
| 715 | printk("Not a DMA resource\n"); |
| 716 | return NULL; |
| 717 | } |
| 718 | |
| 719 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); |
| 720 | |
| 721 | dma_list = (struct vme_dma_list *)kmalloc( |
| 722 | sizeof(struct vme_dma_list), GFP_KERNEL); |
| 723 | if(dma_list == NULL) { |
| 724 | printk("Unable to allocate memory for new dma list\n"); |
| 725 | return NULL; |
| 726 | } |
| 727 | INIT_LIST_HEAD(&(dma_list->entries)); |
| 728 | dma_list->parent = ctrlr; |
| 729 | init_MUTEX(&(dma_list->sem)); |
| 730 | |
| 731 | return dma_list; |
| 732 | } |
| 733 | EXPORT_SYMBOL(vme_new_dma_list); |
| 734 | |
| 735 | /* |
| 736 | * Create "Pattern" type attributes |
| 737 | */ |
| 738 | struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, |
| 739 | vme_pattern_t type) |
| 740 | { |
| 741 | struct vme_dma_attr *attributes; |
| 742 | struct vme_dma_pattern *pattern_attr; |
| 743 | |
| 744 | attributes = (struct vme_dma_attr *)kmalloc( |
| 745 | sizeof(struct vme_dma_attr), GFP_KERNEL); |
| 746 | if(attributes == NULL) { |
| 747 | printk("Unable to allocate memory for attributes structure\n"); |
| 748 | goto err_attr; |
| 749 | } |
| 750 | |
| 751 | pattern_attr = (struct vme_dma_pattern *)kmalloc( |
| 752 | sizeof(struct vme_dma_pattern), GFP_KERNEL); |
| 753 | if(pattern_attr == NULL) { |
| 754 | printk("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 | kfree(pattern_attr); |
| 767 | err_pat: |
| 768 | kfree(attributes); |
| 769 | err_attr: |
| 770 | return NULL; |
| 771 | } |
| 772 | EXPORT_SYMBOL(vme_dma_pattern_attribute); |
| 773 | |
| 774 | /* |
| 775 | * Create "PCI" type attributes |
| 776 | */ |
| 777 | struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address) |
| 778 | { |
| 779 | struct vme_dma_attr *attributes; |
| 780 | struct vme_dma_pci *pci_attr; |
| 781 | |
| 782 | /* XXX Run some sanity checks here */ |
| 783 | |
| 784 | attributes = (struct vme_dma_attr *)kmalloc( |
| 785 | sizeof(struct vme_dma_attr), GFP_KERNEL); |
| 786 | if(attributes == NULL) { |
| 787 | printk("Unable to allocate memory for attributes structure\n"); |
| 788 | goto err_attr; |
| 789 | } |
| 790 | |
| 791 | pci_attr = (struct vme_dma_pci *)kmalloc(sizeof(struct vme_dma_pci), |
| 792 | GFP_KERNEL); |
| 793 | if(pci_attr == NULL) { |
| 794 | printk("Unable to allocate memory for pci attributes\n"); |
| 795 | goto err_pci; |
| 796 | } |
| 797 | |
| 798 | |
| 799 | |
| 800 | attributes->type = VME_DMA_PCI; |
| 801 | attributes->private = (void *)pci_attr; |
| 802 | |
| 803 | pci_attr->address = address; |
| 804 | |
| 805 | return attributes; |
| 806 | |
| 807 | kfree(pci_attr); |
| 808 | err_pci: |
| 809 | kfree(attributes); |
| 810 | err_attr: |
| 811 | return NULL; |
| 812 | } |
| 813 | EXPORT_SYMBOL(vme_dma_pci_attribute); |
| 814 | |
| 815 | /* |
| 816 | * Create "VME" type attributes |
| 817 | */ |
| 818 | struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address, |
| 819 | vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth) |
| 820 | { |
| 821 | struct vme_dma_attr *attributes; |
| 822 | struct vme_dma_vme *vme_attr; |
| 823 | |
| 824 | /* XXX Run some sanity checks here */ |
| 825 | |
| 826 | attributes = (struct vme_dma_attr *)kmalloc( |
| 827 | sizeof(struct vme_dma_attr), GFP_KERNEL); |
| 828 | if(attributes == NULL) { |
| 829 | printk("Unable to allocate memory for attributes structure\n"); |
| 830 | goto err_attr; |
| 831 | } |
| 832 | |
| 833 | vme_attr = (struct vme_dma_vme *)kmalloc(sizeof(struct vme_dma_vme), |
| 834 | GFP_KERNEL); |
| 835 | if(vme_attr == NULL) { |
| 836 | printk("Unable to allocate memory for vme attributes\n"); |
| 837 | goto err_vme; |
| 838 | } |
| 839 | |
| 840 | attributes->type = VME_DMA_VME; |
| 841 | attributes->private = (void *)vme_attr; |
| 842 | |
| 843 | vme_attr->address = address; |
| 844 | vme_attr->aspace = aspace; |
| 845 | vme_attr->cycle = cycle; |
| 846 | vme_attr->dwidth = dwidth; |
| 847 | |
| 848 | return attributes; |
| 849 | |
| 850 | kfree(vme_attr); |
| 851 | err_vme: |
| 852 | kfree(attributes); |
| 853 | err_attr: |
| 854 | return NULL; |
| 855 | } |
| 856 | EXPORT_SYMBOL(vme_dma_vme_attribute); |
| 857 | |
| 858 | /* |
| 859 | * Free attribute |
| 860 | */ |
| 861 | void vme_dma_free_attribute(struct vme_dma_attr *attributes) |
| 862 | { |
| 863 | kfree(attributes->private); |
| 864 | kfree(attributes); |
| 865 | } |
| 866 | EXPORT_SYMBOL(vme_dma_free_attribute); |
| 867 | |
| 868 | int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src, |
| 869 | struct vme_dma_attr *dest, size_t count) |
| 870 | { |
| 871 | struct vme_bridge *bridge = list->parent->parent; |
| 872 | int retval; |
| 873 | |
| 874 | if (bridge->dma_list_add == NULL) { |
| 875 | printk("Link List DMA generation not supported\n"); |
| 876 | return -EINVAL; |
| 877 | } |
| 878 | |
| 879 | if (down_trylock(&(list->sem))) { |
| 880 | printk("Link List already submitted\n"); |
| 881 | return -EINVAL; |
| 882 | } |
| 883 | |
| 884 | retval = bridge->dma_list_add(list, src, dest, count); |
| 885 | |
| 886 | up(&(list->sem)); |
| 887 | |
| 888 | return retval; |
| 889 | } |
| 890 | EXPORT_SYMBOL(vme_dma_list_add); |
| 891 | |
| 892 | int vme_dma_list_exec(struct vme_dma_list *list) |
| 893 | { |
| 894 | struct vme_bridge *bridge = list->parent->parent; |
| 895 | int retval; |
| 896 | |
| 897 | if (bridge->dma_list_exec == NULL) { |
| 898 | printk("Link List DMA execution not supported\n"); |
| 899 | return -EINVAL; |
| 900 | } |
| 901 | |
| 902 | down(&(list->sem)); |
| 903 | |
| 904 | retval = bridge->dma_list_exec(list); |
| 905 | |
| 906 | up(&(list->sem)); |
| 907 | |
| 908 | return retval; |
| 909 | } |
| 910 | EXPORT_SYMBOL(vme_dma_list_exec); |
| 911 | |
| 912 | int vme_dma_list_free(struct vme_dma_list *list) |
| 913 | { |
| 914 | struct vme_bridge *bridge = list->parent->parent; |
| 915 | int retval; |
| 916 | |
| 917 | if (bridge->dma_list_empty == NULL) { |
| 918 | printk("Emptying of Link Lists not supported\n"); |
| 919 | return -EINVAL; |
| 920 | } |
| 921 | |
| 922 | if (down_trylock(&(list->sem))) { |
| 923 | printk("Link List in use\n"); |
| 924 | return -EINVAL; |
| 925 | } |
| 926 | |
| 927 | /* |
| 928 | * Empty out all of the entries from the dma list. We need to go to the |
| 929 | * low level driver as dma entries are driver specific. |
| 930 | */ |
| 931 | retval = bridge->dma_list_empty(list); |
| 932 | if (retval) { |
| 933 | printk("Unable to empty link-list entries\n"); |
| 934 | up(&(list->sem)); |
| 935 | return retval; |
| 936 | } |
| 937 | up(&(list->sem)); |
| 938 | kfree(list); |
| 939 | |
| 940 | return retval; |
| 941 | } |
| 942 | EXPORT_SYMBOL(vme_dma_list_free); |
| 943 | |
| 944 | int vme_dma_free(struct vme_resource *resource) |
| 945 | { |
| 946 | struct vme_dma_resource *ctrlr; |
| 947 | |
| 948 | if (resource->type != VME_DMA) { |
| 949 | printk("Not a DMA resource\n"); |
| 950 | return -EINVAL; |
| 951 | } |
| 952 | |
| 953 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); |
| 954 | |
| 955 | if (down_trylock(&(ctrlr->sem))) { |
| 956 | printk("Resource busy, can't free\n"); |
| 957 | return -EBUSY; |
| 958 | } |
| 959 | |
| 960 | if (!(list_empty(&(ctrlr->pending)) && list_empty(&(ctrlr->running)))) { |
| 961 | printk("Resource still processing transfers\n"); |
| 962 | up(&(ctrlr->sem)); |
| 963 | return -EBUSY; |
| 964 | } |
| 965 | |
| 966 | ctrlr->locked = 0; |
| 967 | |
| 968 | up(&(ctrlr->sem)); |
| 969 | |
| 970 | return 0; |
| 971 | } |
| 972 | EXPORT_SYMBOL(vme_dma_free); |
| 973 | |
| 974 | int vme_request_irq(struct device *dev, int level, int statid, |
| 975 | void (*callback)(int level, int vector, void *priv_data), |
| 976 | void *priv_data) |
| 977 | { |
| 978 | struct vme_bridge *bridge; |
| 979 | |
| 980 | bridge = dev_to_bridge(dev); |
| 981 | if (bridge == NULL) { |
| 982 | printk(KERN_ERR "Can't find VME bus\n"); |
| 983 | return -EINVAL; |
| 984 | } |
| 985 | |
| 986 | if((level < 1) || (level > 7)) { |
| 987 | printk(KERN_WARNING "Invalid interrupt level\n"); |
| 988 | return -EINVAL; |
| 989 | } |
| 990 | |
| 991 | if (bridge->request_irq == NULL) { |
| 992 | printk("Registering interrupts not supported\n"); |
| 993 | return -EINVAL; |
| 994 | } |
| 995 | |
| 996 | return bridge->request_irq(level, statid, callback, priv_data); |
| 997 | } |
| 998 | EXPORT_SYMBOL(vme_request_irq); |
| 999 | |
| 1000 | void vme_free_irq(struct device *dev, int level, int statid) |
| 1001 | { |
| 1002 | struct vme_bridge *bridge; |
| 1003 | |
| 1004 | bridge = dev_to_bridge(dev); |
| 1005 | if (bridge == NULL) { |
| 1006 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1007 | return; |
| 1008 | } |
| 1009 | |
| 1010 | if((level < 1) || (level > 7)) { |
| 1011 | printk(KERN_WARNING "Invalid interrupt level\n"); |
| 1012 | return; |
| 1013 | } |
| 1014 | |
| 1015 | if (bridge->free_irq == NULL) { |
| 1016 | printk("Freeing interrupts not supported\n"); |
| 1017 | return; |
| 1018 | } |
| 1019 | |
| 1020 | bridge->free_irq(level, statid); |
| 1021 | } |
| 1022 | EXPORT_SYMBOL(vme_free_irq); |
| 1023 | |
| 1024 | int vme_generate_irq(struct device *dev, int level, int statid) |
| 1025 | { |
| 1026 | struct vme_bridge *bridge; |
| 1027 | |
| 1028 | bridge = dev_to_bridge(dev); |
| 1029 | if (bridge == NULL) { |
| 1030 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1031 | return -EINVAL; |
| 1032 | } |
| 1033 | |
| 1034 | if((level < 1) || (level > 7)) { |
| 1035 | printk(KERN_WARNING "Invalid interrupt level\n"); |
| 1036 | return -EINVAL; |
| 1037 | } |
| 1038 | |
| 1039 | if (bridge->generate_irq == NULL) { |
| 1040 | printk("Interrupt generation not supported\n"); |
| 1041 | return -EINVAL; |
| 1042 | } |
| 1043 | |
| 1044 | return bridge->generate_irq(level, statid); |
| 1045 | } |
| 1046 | EXPORT_SYMBOL(vme_generate_irq); |
| 1047 | |
| 1048 | int vme_lm_set(struct device *dev, unsigned long long lm_base, vme_address_t aspace, |
| 1049 | vme_cycle_t cycle) |
| 1050 | { |
| 1051 | struct vme_bridge *bridge; |
| 1052 | |
| 1053 | bridge = dev_to_bridge(dev); |
| 1054 | if (bridge == NULL) { |
| 1055 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1056 | return -EINVAL; |
| 1057 | } |
| 1058 | |
| 1059 | if (bridge->lm_set == NULL) { |
| 1060 | printk("vme_lm_set not supported\n"); |
| 1061 | return -EINVAL; |
| 1062 | } |
| 1063 | |
| 1064 | return bridge->lm_set(lm_base, aspace, cycle); |
| 1065 | } |
| 1066 | EXPORT_SYMBOL(vme_lm_set); |
| 1067 | |
| 1068 | int vme_lm_get(struct device *dev, unsigned long long *lm_base, vme_address_t *aspace, |
| 1069 | vme_cycle_t *cycle) |
| 1070 | { |
| 1071 | struct vme_bridge *bridge; |
| 1072 | |
| 1073 | bridge = dev_to_bridge(dev); |
| 1074 | if (bridge == NULL) { |
| 1075 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1076 | return -EINVAL; |
| 1077 | } |
| 1078 | |
| 1079 | if (bridge->lm_get == NULL) { |
| 1080 | printk("vme_lm_get not supported\n"); |
| 1081 | return -EINVAL; |
| 1082 | } |
| 1083 | |
| 1084 | return bridge->lm_get(lm_base, aspace, cycle); |
| 1085 | } |
| 1086 | EXPORT_SYMBOL(vme_lm_get); |
| 1087 | |
| 1088 | int vme_lm_attach(struct device *dev, int monitor, void (*callback)(int)) |
| 1089 | { |
| 1090 | struct vme_bridge *bridge; |
| 1091 | |
| 1092 | bridge = dev_to_bridge(dev); |
| 1093 | if (bridge == NULL) { |
| 1094 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1095 | return -EINVAL; |
| 1096 | } |
| 1097 | |
| 1098 | if (bridge->lm_attach == NULL) { |
| 1099 | printk("vme_lm_attach not supported\n"); |
| 1100 | return -EINVAL; |
| 1101 | } |
| 1102 | |
| 1103 | return bridge->lm_attach(monitor, callback); |
| 1104 | } |
| 1105 | EXPORT_SYMBOL(vme_lm_attach); |
| 1106 | |
| 1107 | int vme_lm_detach(struct device *dev, int monitor) |
| 1108 | { |
| 1109 | struct vme_bridge *bridge; |
| 1110 | |
| 1111 | bridge = dev_to_bridge(dev); |
| 1112 | if (bridge == NULL) { |
| 1113 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1114 | return -EINVAL; |
| 1115 | } |
| 1116 | |
| 1117 | if (bridge->lm_detach == NULL) { |
| 1118 | printk("vme_lm_detach not supported\n"); |
| 1119 | return -EINVAL; |
| 1120 | } |
| 1121 | |
| 1122 | return bridge->lm_detach(monitor); |
| 1123 | } |
| 1124 | EXPORT_SYMBOL(vme_lm_detach); |
| 1125 | |
| 1126 | int vme_slot_get(struct device *bus) |
| 1127 | { |
| 1128 | struct vme_bridge *bridge; |
| 1129 | |
| 1130 | bridge = dev_to_bridge(bus); |
| 1131 | if (bridge == NULL) { |
| 1132 | printk(KERN_ERR "Can't find VME bus\n"); |
| 1133 | return -EINVAL; |
| 1134 | } |
| 1135 | |
| 1136 | if (bridge->slot_get == NULL) { |
| 1137 | printk("vme_slot_get not supported\n"); |
| 1138 | return -EINVAL; |
| 1139 | } |
| 1140 | |
| 1141 | return bridge->slot_get(); |
| 1142 | } |
| 1143 | EXPORT_SYMBOL(vme_slot_get); |
| 1144 | |
| 1145 | |
| 1146 | /* - Bridge Registration --------------------------------------------------- */ |
| 1147 | |
| 1148 | static int vme_alloc_bus_num(void) |
| 1149 | { |
| 1150 | int i; |
| 1151 | |
| 1152 | down(&vme_bus_num_sem); |
| 1153 | for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) { |
| 1154 | if (((vme_bus_numbers >> i) & 0x1) == 0) { |
| 1155 | vme_bus_numbers |= (0x1 << i); |
| 1156 | break; |
| 1157 | } |
| 1158 | } |
| 1159 | up(&vme_bus_num_sem); |
| 1160 | |
| 1161 | return i; |
| 1162 | } |
| 1163 | |
| 1164 | static void vme_free_bus_num(int bus) |
| 1165 | { |
| 1166 | down(&vme_bus_num_sem); |
| 1167 | vme_bus_numbers |= ~(0x1 << bus); |
| 1168 | up(&vme_bus_num_sem); |
| 1169 | } |
| 1170 | |
| 1171 | int vme_register_bridge (struct vme_bridge *bridge) |
| 1172 | { |
| 1173 | struct device *dev; |
| 1174 | int retval; |
| 1175 | int i; |
| 1176 | |
| 1177 | bridge->num = vme_alloc_bus_num(); |
| 1178 | |
| 1179 | /* This creates 32 vme "slot" devices. This equates to a slot for each |
| 1180 | * ID available in a system conforming to the ANSI/VITA 1-1994 |
| 1181 | * specification. |
| 1182 | */ |
| 1183 | for (i = 0; i < VME_SLOTS_MAX; i++) { |
| 1184 | dev = &(bridge->dev[i]); |
| 1185 | memset(dev, 0, sizeof(struct device)); |
| 1186 | |
| 1187 | dev->parent = bridge->parent; |
| 1188 | dev->bus = &(vme_bus_type); |
| 1189 | /* |
| 1190 | * We save a pointer to the bridge in platform_data so that we |
| 1191 | * can get to it later. We keep driver_data for use by the |
| 1192 | * driver that binds against the slot |
| 1193 | */ |
| 1194 | dev->platform_data = bridge; |
| 1195 | dev_set_name(dev, "vme-%x.%x", bridge->num, i + 1); |
| 1196 | |
| 1197 | retval = device_register(dev); |
| 1198 | if(retval) |
| 1199 | goto err_reg; |
| 1200 | } |
| 1201 | |
| 1202 | return retval; |
| 1203 | |
| 1204 | i = VME_SLOTS_MAX; |
| 1205 | err_reg: |
| 1206 | while (i > -1) { |
| 1207 | dev = &(bridge->dev[i]); |
| 1208 | device_unregister(dev); |
| 1209 | } |
| 1210 | vme_free_bus_num(bridge->num); |
| 1211 | return retval; |
| 1212 | } |
| 1213 | EXPORT_SYMBOL(vme_register_bridge); |
| 1214 | |
| 1215 | void vme_unregister_bridge (struct vme_bridge *bridge) |
| 1216 | { |
| 1217 | int i; |
| 1218 | struct device *dev; |
| 1219 | |
| 1220 | |
| 1221 | for (i = 0; i < VME_SLOTS_MAX; i++) { |
| 1222 | dev = &(bridge->dev[i]); |
| 1223 | device_unregister(dev); |
| 1224 | } |
| 1225 | vme_free_bus_num(bridge->num); |
| 1226 | } |
| 1227 | EXPORT_SYMBOL(vme_unregister_bridge); |
| 1228 | |
| 1229 | |
| 1230 | /* - Driver Registration --------------------------------------------------- */ |
| 1231 | |
| 1232 | int vme_register_driver (struct vme_driver *drv) |
| 1233 | { |
| 1234 | drv->driver.name = drv->name; |
| 1235 | drv->driver.bus = &vme_bus_type; |
| 1236 | |
| 1237 | return driver_register(&drv->driver); |
| 1238 | } |
| 1239 | EXPORT_SYMBOL(vme_register_driver); |
| 1240 | |
| 1241 | void vme_unregister_driver (struct vme_driver *drv) |
| 1242 | { |
| 1243 | driver_unregister(&drv->driver); |
| 1244 | } |
| 1245 | EXPORT_SYMBOL(vme_unregister_driver); |
| 1246 | |
| 1247 | /* - Bus Registration ------------------------------------------------------ */ |
| 1248 | |
| 1249 | int vme_calc_slot(struct device *dev) |
| 1250 | { |
| 1251 | struct vme_bridge *bridge; |
| 1252 | int num; |
| 1253 | |
| 1254 | bridge = dev_to_bridge(dev); |
| 1255 | |
| 1256 | /* Determine slot number */ |
| 1257 | num = 0; |
| 1258 | while(num < VME_SLOTS_MAX) { |
| 1259 | if(&(bridge->dev[num]) == dev) { |
| 1260 | break; |
| 1261 | } |
| 1262 | num++; |
| 1263 | } |
| 1264 | if (num == VME_SLOTS_MAX) { |
| 1265 | dev_err(dev, "Failed to identify slot\n"); |
| 1266 | num = 0; |
| 1267 | goto err_dev; |
| 1268 | } |
| 1269 | num++; |
| 1270 | |
| 1271 | err_dev: |
| 1272 | return num; |
| 1273 | } |
| 1274 | |
| 1275 | static struct vme_driver *dev_to_vme_driver(struct device *dev) |
| 1276 | { |
| 1277 | if(dev->driver == NULL) |
| 1278 | printk("Bugger dev->driver is NULL\n"); |
| 1279 | |
| 1280 | return container_of(dev->driver, struct vme_driver, driver); |
| 1281 | } |
| 1282 | |
| 1283 | static int vme_bus_match(struct device *dev, struct device_driver *drv) |
| 1284 | { |
| 1285 | struct vme_bridge *bridge; |
| 1286 | struct vme_driver *driver; |
| 1287 | int i, num; |
| 1288 | |
| 1289 | bridge = dev_to_bridge(dev); |
| 1290 | driver = container_of(drv, struct vme_driver, driver); |
| 1291 | |
| 1292 | num = vme_calc_slot(dev); |
| 1293 | if (!num) |
| 1294 | goto err_dev; |
| 1295 | |
| 1296 | if (driver->bind_table == NULL) { |
| 1297 | dev_err(dev, "Bind table NULL\n"); |
| 1298 | goto err_table; |
| 1299 | } |
| 1300 | |
| 1301 | i = 0; |
| 1302 | while((driver->bind_table[i].bus != 0) || |
| 1303 | (driver->bind_table[i].slot != 0)) { |
| 1304 | |
| 1305 | if ((bridge->num == driver->bind_table[i].bus) && |
| 1306 | (num == driver->bind_table[i].slot)) |
| 1307 | return 1; |
| 1308 | i++; |
| 1309 | } |
| 1310 | |
| 1311 | err_dev: |
| 1312 | err_table: |
| 1313 | return 0; |
| 1314 | } |
| 1315 | |
| 1316 | static int vme_bus_probe(struct device *dev) |
| 1317 | { |
| 1318 | struct vme_bridge *bridge; |
| 1319 | struct vme_driver *driver; |
| 1320 | int retval = -ENODEV; |
| 1321 | |
| 1322 | driver = dev_to_vme_driver(dev); |
| 1323 | bridge = dev_to_bridge(dev); |
| 1324 | |
| 1325 | if(driver->probe != NULL) { |
| 1326 | retval = driver->probe(dev, bridge->num, vme_calc_slot(dev)); |
| 1327 | } |
| 1328 | |
| 1329 | return retval; |
| 1330 | } |
| 1331 | |
| 1332 | static int vme_bus_remove(struct device *dev) |
| 1333 | { |
| 1334 | struct vme_bridge *bridge; |
| 1335 | struct vme_driver *driver; |
| 1336 | int retval = -ENODEV; |
| 1337 | |
| 1338 | driver = dev_to_vme_driver(dev); |
| 1339 | bridge = dev_to_bridge(dev); |
| 1340 | |
| 1341 | if(driver->remove != NULL) { |
| 1342 | retval = driver->remove(dev, bridge->num, vme_calc_slot(dev)); |
| 1343 | } |
| 1344 | |
| 1345 | return retval; |
| 1346 | } |
| 1347 | |
| 1348 | struct bus_type vme_bus_type = { |
| 1349 | .name = "vme", |
| 1350 | .match = vme_bus_match, |
| 1351 | .probe = vme_bus_probe, |
| 1352 | .remove = vme_bus_remove, |
| 1353 | }; |
| 1354 | EXPORT_SYMBOL(vme_bus_type); |
| 1355 | |
| 1356 | static int __init vme_init (void) |
| 1357 | { |
| 1358 | return bus_register(&vme_bus_type); |
| 1359 | } |
| 1360 | |
| 1361 | static void __exit vme_exit (void) |
| 1362 | { |
| 1363 | bus_unregister(&vme_bus_type); |
| 1364 | } |
| 1365 | |
| 1366 | MODULE_DESCRIPTION("VME bridge driver framework"); |
| 1367 | MODULE_AUTHOR("Martyn Welch <martyn.welch@gefanuc.com"); |
| 1368 | MODULE_LICENSE("GPL"); |
| 1369 | |
| 1370 | module_init(vme_init); |
| 1371 | module_exit(vme_exit); |