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a17a75e2 MW |
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 | ||
a17a75e2 MW |
16 | #include <linux/module.h> |
17 | #include <linux/moduleparam.h> | |
18 | #include <linux/mm.h> | |
19 | #include <linux/types.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/pci.h> | |
23 | #include <linux/poll.h> | |
24 | #include <linux/highmem.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/pagemap.h> | |
27 | #include <linux/device.h> | |
28 | #include <linux/dma-mapping.h> | |
29 | #include <linux/syscalls.h> | |
400822fe | 30 | #include <linux/mutex.h> |
a17a75e2 MW |
31 | #include <linux/spinlock.h> |
32 | ||
33 | #include "vme.h" | |
34 | #include "vme_bridge.h" | |
35 | ||
400822fe | 36 | /* Bitmask and mutex to keep track of bridge numbers */ |
a17a75e2 | 37 | static unsigned int vme_bus_numbers; |
400822fe | 38 | DEFINE_MUTEX(vme_bus_num_mtx); |
a17a75e2 | 39 | |
ead1f3e3 MW |
40 | static void __exit vme_exit(void); |
41 | static int __init vme_init(void); | |
a17a75e2 MW |
42 | |
43 | ||
44 | /* | |
45 | * Find the bridge resource associated with a specific device resource | |
46 | */ | |
47 | static struct vme_bridge *dev_to_bridge(struct device *dev) | |
48 | { | |
49 | return dev->platform_data; | |
50 | } | |
51 | ||
52 | /* | |
53 | * Find the bridge that the resource is associated with. | |
54 | */ | |
55 | static struct vme_bridge *find_bridge(struct vme_resource *resource) | |
56 | { | |
57 | /* Get list to search */ | |
58 | switch (resource->type) { | |
59 | case VME_MASTER: | |
60 | return list_entry(resource->entry, struct vme_master_resource, | |
61 | list)->parent; | |
62 | break; | |
63 | case VME_SLAVE: | |
64 | return list_entry(resource->entry, struct vme_slave_resource, | |
65 | list)->parent; | |
66 | break; | |
67 | case VME_DMA: | |
68 | return list_entry(resource->entry, struct vme_dma_resource, | |
69 | list)->parent; | |
70 | break; | |
42fb5031 MW |
71 | case VME_LM: |
72 | return list_entry(resource->entry, struct vme_lm_resource, | |
73 | list)->parent; | |
74 | break; | |
a17a75e2 MW |
75 | default: |
76 | printk(KERN_ERR "Unknown resource type\n"); | |
77 | return NULL; | |
78 | break; | |
79 | } | |
80 | } | |
81 | ||
82 | /* | |
83 | * Allocate a contiguous block of memory for use by the driver. This is used to | |
84 | * create the buffers for the slave windows. | |
85 | * | |
86 | * XXX VME bridges could be available on buses other than PCI. At the momment | |
87 | * this framework only supports PCI devices. | |
88 | */ | |
ead1f3e3 | 89 | void *vme_alloc_consistent(struct vme_resource *resource, size_t size, |
a17a75e2 MW |
90 | dma_addr_t *dma) |
91 | { | |
92 | struct vme_bridge *bridge; | |
93 | struct pci_dev *pdev; | |
94 | ||
ead1f3e3 MW |
95 | if (resource == NULL) { |
96 | printk(KERN_ERR "No resource\n"); | |
a17a75e2 MW |
97 | return NULL; |
98 | } | |
99 | ||
100 | bridge = find_bridge(resource); | |
ead1f3e3 MW |
101 | if (bridge == NULL) { |
102 | printk(KERN_ERR "Can't find bridge\n"); | |
a17a75e2 MW |
103 | return NULL; |
104 | } | |
105 | ||
106 | /* Find pci_dev container of dev */ | |
107 | if (bridge->parent == NULL) { | |
ead1f3e3 | 108 | printk(KERN_ERR "Dev entry NULL\n"); |
a17a75e2 MW |
109 | return NULL; |
110 | } | |
111 | pdev = container_of(bridge->parent, struct pci_dev, dev); | |
112 | ||
113 | return pci_alloc_consistent(pdev, size, dma); | |
114 | } | |
115 | EXPORT_SYMBOL(vme_alloc_consistent); | |
116 | ||
117 | /* | |
118 | * Free previously allocated contiguous block of memory. | |
119 | * | |
120 | * XXX VME bridges could be available on buses other than PCI. At the momment | |
121 | * this framework only supports PCI devices. | |
122 | */ | |
123 | void vme_free_consistent(struct vme_resource *resource, size_t size, | |
124 | void *vaddr, dma_addr_t dma) | |
125 | { | |
126 | struct vme_bridge *bridge; | |
127 | struct pci_dev *pdev; | |
128 | ||
ead1f3e3 MW |
129 | if (resource == NULL) { |
130 | printk(KERN_ERR "No resource\n"); | |
a17a75e2 MW |
131 | return; |
132 | } | |
133 | ||
134 | bridge = find_bridge(resource); | |
ead1f3e3 MW |
135 | if (bridge == NULL) { |
136 | printk(KERN_ERR "Can't find bridge\n"); | |
a17a75e2 MW |
137 | return; |
138 | } | |
139 | ||
140 | /* Find pci_dev container of dev */ | |
141 | pdev = container_of(bridge->parent, struct pci_dev, dev); | |
142 | ||
143 | pci_free_consistent(pdev, size, vaddr, dma); | |
144 | } | |
145 | EXPORT_SYMBOL(vme_free_consistent); | |
146 | ||
147 | size_t vme_get_size(struct vme_resource *resource) | |
148 | { | |
149 | int enabled, retval; | |
150 | unsigned long long base, size; | |
151 | dma_addr_t buf_base; | |
152 | vme_address_t aspace; | |
153 | vme_cycle_t cycle; | |
154 | vme_width_t dwidth; | |
155 | ||
156 | switch (resource->type) { | |
157 | case VME_MASTER: | |
158 | retval = vme_master_get(resource, &enabled, &base, &size, | |
159 | &aspace, &cycle, &dwidth); | |
160 | ||
161 | return size; | |
162 | break; | |
163 | case VME_SLAVE: | |
164 | retval = vme_slave_get(resource, &enabled, &base, &size, | |
165 | &buf_base, &aspace, &cycle); | |
166 | ||
167 | return size; | |
168 | break; | |
169 | case VME_DMA: | |
170 | return 0; | |
171 | break; | |
172 | default: | |
173 | printk(KERN_ERR "Unknown resource type\n"); | |
174 | return 0; | |
175 | break; | |
176 | } | |
177 | } | |
178 | EXPORT_SYMBOL(vme_get_size); | |
179 | ||
180 | static int vme_check_window(vme_address_t aspace, unsigned long long vme_base, | |
181 | unsigned long long size) | |
182 | { | |
183 | int retval = 0; | |
184 | ||
185 | switch (aspace) { | |
186 | case VME_A16: | |
187 | if (((vme_base + size) > VME_A16_MAX) || | |
188 | (vme_base > VME_A16_MAX)) | |
189 | retval = -EFAULT; | |
190 | break; | |
191 | case VME_A24: | |
192 | if (((vme_base + size) > VME_A24_MAX) || | |
193 | (vme_base > VME_A24_MAX)) | |
194 | retval = -EFAULT; | |
195 | break; | |
196 | case VME_A32: | |
197 | if (((vme_base + size) > VME_A32_MAX) || | |
198 | (vme_base > VME_A32_MAX)) | |
199 | retval = -EFAULT; | |
200 | break; | |
201 | case VME_A64: | |
202 | /* | |
203 | * Any value held in an unsigned long long can be used as the | |
204 | * base | |
205 | */ | |
206 | break; | |
207 | case VME_CRCSR: | |
208 | if (((vme_base + size) > VME_CRCSR_MAX) || | |
209 | (vme_base > VME_CRCSR_MAX)) | |
210 | retval = -EFAULT; | |
211 | break; | |
212 | case VME_USER1: | |
213 | case VME_USER2: | |
214 | case VME_USER3: | |
215 | case VME_USER4: | |
216 | /* User Defined */ | |
217 | break; | |
218 | default: | |
ead1f3e3 | 219 | printk(KERN_ERR "Invalid address space\n"); |
a17a75e2 MW |
220 | retval = -EINVAL; |
221 | break; | |
222 | } | |
223 | ||
224 | return retval; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Request a slave image with specific attributes, return some unique | |
229 | * identifier. | |
230 | */ | |
ead1f3e3 | 231 | struct vme_resource *vme_slave_request(struct device *dev, |
a17a75e2 MW |
232 | vme_address_t address, vme_cycle_t cycle) |
233 | { | |
234 | struct vme_bridge *bridge; | |
235 | struct list_head *slave_pos = NULL; | |
236 | struct vme_slave_resource *allocated_image = NULL; | |
237 | struct vme_slave_resource *slave_image = NULL; | |
238 | struct vme_resource *resource = NULL; | |
239 | ||
240 | bridge = dev_to_bridge(dev); | |
241 | if (bridge == NULL) { | |
242 | printk(KERN_ERR "Can't find VME bus\n"); | |
243 | goto err_bus; | |
244 | } | |
245 | ||
246 | /* Loop through slave resources */ | |
247 | list_for_each(slave_pos, &(bridge->slave_resources)) { | |
248 | slave_image = list_entry(slave_pos, | |
249 | struct vme_slave_resource, list); | |
250 | ||
251 | if (slave_image == NULL) { | |
ead1f3e3 | 252 | printk(KERN_ERR "Registered NULL Slave resource\n"); |
a17a75e2 MW |
253 | continue; |
254 | } | |
255 | ||
256 | /* Find an unlocked and compatible image */ | |
400822fe | 257 | mutex_lock(&(slave_image->mtx)); |
ead1f3e3 | 258 | if (((slave_image->address_attr & address) == address) && |
a17a75e2 MW |
259 | ((slave_image->cycle_attr & cycle) == cycle) && |
260 | (slave_image->locked == 0)) { | |
261 | ||
262 | slave_image->locked = 1; | |
400822fe | 263 | mutex_unlock(&(slave_image->mtx)); |
a17a75e2 MW |
264 | allocated_image = slave_image; |
265 | break; | |
266 | } | |
400822fe | 267 | mutex_unlock(&(slave_image->mtx)); |
a17a75e2 MW |
268 | } |
269 | ||
270 | /* No free image */ | |
271 | if (allocated_image == NULL) | |
272 | goto err_image; | |
273 | ||
274 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
275 | if (resource == NULL) { | |
276 | printk(KERN_WARNING "Unable to allocate resource structure\n"); | |
277 | goto err_alloc; | |
278 | } | |
279 | resource->type = VME_SLAVE; | |
280 | resource->entry = &(allocated_image->list); | |
281 | ||
282 | return resource; | |
283 | ||
284 | err_alloc: | |
285 | /* Unlock image */ | |
400822fe | 286 | mutex_lock(&(slave_image->mtx)); |
a17a75e2 | 287 | slave_image->locked = 0; |
400822fe | 288 | mutex_unlock(&(slave_image->mtx)); |
a17a75e2 MW |
289 | err_image: |
290 | err_bus: | |
291 | return NULL; | |
292 | } | |
293 | EXPORT_SYMBOL(vme_slave_request); | |
294 | ||
ead1f3e3 | 295 | int vme_slave_set(struct vme_resource *resource, int enabled, |
a17a75e2 MW |
296 | unsigned long long vme_base, unsigned long long size, |
297 | dma_addr_t buf_base, vme_address_t aspace, vme_cycle_t cycle) | |
298 | { | |
299 | struct vme_bridge *bridge = find_bridge(resource); | |
300 | struct vme_slave_resource *image; | |
301 | int retval; | |
302 | ||
303 | if (resource->type != VME_SLAVE) { | |
ead1f3e3 | 304 | printk(KERN_ERR "Not a slave resource\n"); |
a17a75e2 MW |
305 | return -EINVAL; |
306 | } | |
307 | ||
308 | image = list_entry(resource->entry, struct vme_slave_resource, list); | |
309 | ||
310 | if (bridge->slave_set == NULL) { | |
ead1f3e3 | 311 | printk(KERN_ERR "Function not supported\n"); |
a17a75e2 MW |
312 | return -ENOSYS; |
313 | } | |
314 | ||
ead1f3e3 | 315 | if (!(((image->address_attr & aspace) == aspace) && |
a17a75e2 | 316 | ((image->cycle_attr & cycle) == cycle))) { |
ead1f3e3 | 317 | printk(KERN_ERR "Invalid attributes\n"); |
a17a75e2 MW |
318 | return -EINVAL; |
319 | } | |
320 | ||
321 | retval = vme_check_window(aspace, vme_base, size); | |
ead1f3e3 | 322 | if (retval) |
a17a75e2 MW |
323 | return retval; |
324 | ||
325 | return bridge->slave_set(image, enabled, vme_base, size, buf_base, | |
326 | aspace, cycle); | |
327 | } | |
328 | EXPORT_SYMBOL(vme_slave_set); | |
329 | ||
ead1f3e3 | 330 | int vme_slave_get(struct vme_resource *resource, int *enabled, |
a17a75e2 MW |
331 | unsigned long long *vme_base, unsigned long long *size, |
332 | dma_addr_t *buf_base, vme_address_t *aspace, vme_cycle_t *cycle) | |
333 | { | |
334 | struct vme_bridge *bridge = find_bridge(resource); | |
335 | struct vme_slave_resource *image; | |
336 | ||
337 | if (resource->type != VME_SLAVE) { | |
ead1f3e3 | 338 | printk(KERN_ERR "Not a slave resource\n"); |
a17a75e2 MW |
339 | return -EINVAL; |
340 | } | |
341 | ||
342 | image = list_entry(resource->entry, struct vme_slave_resource, list); | |
343 | ||
51a569f7 | 344 | if (bridge->slave_get == NULL) { |
ead1f3e3 | 345 | printk(KERN_ERR "vme_slave_get not supported\n"); |
a17a75e2 MW |
346 | return -EINVAL; |
347 | } | |
348 | ||
349 | return bridge->slave_get(image, enabled, vme_base, size, buf_base, | |
350 | aspace, cycle); | |
351 | } | |
352 | EXPORT_SYMBOL(vme_slave_get); | |
353 | ||
354 | void vme_slave_free(struct vme_resource *resource) | |
355 | { | |
356 | struct vme_slave_resource *slave_image; | |
357 | ||
358 | if (resource->type != VME_SLAVE) { | |
ead1f3e3 | 359 | printk(KERN_ERR "Not a slave resource\n"); |
a17a75e2 MW |
360 | return; |
361 | } | |
362 | ||
363 | slave_image = list_entry(resource->entry, struct vme_slave_resource, | |
364 | list); | |
365 | if (slave_image == NULL) { | |
ead1f3e3 | 366 | printk(KERN_ERR "Can't find slave resource\n"); |
a17a75e2 MW |
367 | return; |
368 | } | |
369 | ||
370 | /* Unlock image */ | |
400822fe | 371 | mutex_lock(&(slave_image->mtx)); |
a17a75e2 MW |
372 | if (slave_image->locked == 0) |
373 | printk(KERN_ERR "Image is already free\n"); | |
374 | ||
375 | slave_image->locked = 0; | |
400822fe | 376 | mutex_unlock(&(slave_image->mtx)); |
a17a75e2 MW |
377 | |
378 | /* Free up resource memory */ | |
379 | kfree(resource); | |
380 | } | |
381 | EXPORT_SYMBOL(vme_slave_free); | |
382 | ||
383 | /* | |
384 | * Request a master image with specific attributes, return some unique | |
385 | * identifier. | |
386 | */ | |
ead1f3e3 | 387 | struct vme_resource *vme_master_request(struct device *dev, |
a17a75e2 MW |
388 | vme_address_t address, vme_cycle_t cycle, vme_width_t dwidth) |
389 | { | |
390 | struct vme_bridge *bridge; | |
391 | struct list_head *master_pos = NULL; | |
392 | struct vme_master_resource *allocated_image = NULL; | |
393 | struct vme_master_resource *master_image = NULL; | |
394 | struct vme_resource *resource = NULL; | |
395 | ||
396 | bridge = dev_to_bridge(dev); | |
397 | if (bridge == NULL) { | |
398 | printk(KERN_ERR "Can't find VME bus\n"); | |
399 | goto err_bus; | |
400 | } | |
401 | ||
402 | /* Loop through master resources */ | |
403 | list_for_each(master_pos, &(bridge->master_resources)) { | |
404 | master_image = list_entry(master_pos, | |
405 | struct vme_master_resource, list); | |
406 | ||
407 | if (master_image == NULL) { | |
408 | printk(KERN_WARNING "Registered NULL master resource\n"); | |
409 | continue; | |
410 | } | |
411 | ||
412 | /* Find an unlocked and compatible image */ | |
413 | spin_lock(&(master_image->lock)); | |
ead1f3e3 | 414 | if (((master_image->address_attr & address) == address) && |
a17a75e2 MW |
415 | ((master_image->cycle_attr & cycle) == cycle) && |
416 | ((master_image->width_attr & dwidth) == dwidth) && | |
417 | (master_image->locked == 0)) { | |
418 | ||
419 | master_image->locked = 1; | |
420 | spin_unlock(&(master_image->lock)); | |
421 | allocated_image = master_image; | |
422 | break; | |
423 | } | |
424 | spin_unlock(&(master_image->lock)); | |
425 | } | |
426 | ||
427 | /* Check to see if we found a resource */ | |
428 | if (allocated_image == NULL) { | |
429 | printk(KERN_ERR "Can't find a suitable resource\n"); | |
430 | goto err_image; | |
431 | } | |
432 | ||
433 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
434 | if (resource == NULL) { | |
435 | printk(KERN_ERR "Unable to allocate resource structure\n"); | |
436 | goto err_alloc; | |
437 | } | |
438 | resource->type = VME_MASTER; | |
439 | resource->entry = &(allocated_image->list); | |
440 | ||
441 | return resource; | |
442 | ||
443 | kfree(resource); | |
444 | err_alloc: | |
445 | /* Unlock image */ | |
446 | spin_lock(&(master_image->lock)); | |
447 | master_image->locked = 0; | |
448 | spin_unlock(&(master_image->lock)); | |
449 | err_image: | |
450 | err_bus: | |
451 | return NULL; | |
452 | } | |
453 | EXPORT_SYMBOL(vme_master_request); | |
454 | ||
ead1f3e3 | 455 | int vme_master_set(struct vme_resource *resource, int enabled, |
a17a75e2 MW |
456 | unsigned long long vme_base, unsigned long long size, |
457 | vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth) | |
458 | { | |
459 | struct vme_bridge *bridge = find_bridge(resource); | |
460 | struct vme_master_resource *image; | |
461 | int retval; | |
462 | ||
463 | if (resource->type != VME_MASTER) { | |
ead1f3e3 | 464 | printk(KERN_ERR "Not a master resource\n"); |
a17a75e2 MW |
465 | return -EINVAL; |
466 | } | |
467 | ||
468 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
469 | ||
470 | if (bridge->master_set == NULL) { | |
ead1f3e3 | 471 | printk(KERN_WARNING "vme_master_set not supported\n"); |
a17a75e2 MW |
472 | return -EINVAL; |
473 | } | |
474 | ||
ead1f3e3 | 475 | if (!(((image->address_attr & aspace) == aspace) && |
a17a75e2 MW |
476 | ((image->cycle_attr & cycle) == cycle) && |
477 | ((image->width_attr & dwidth) == dwidth))) { | |
ead1f3e3 | 478 | printk(KERN_WARNING "Invalid attributes\n"); |
a17a75e2 MW |
479 | return -EINVAL; |
480 | } | |
481 | ||
482 | retval = vme_check_window(aspace, vme_base, size); | |
ead1f3e3 | 483 | if (retval) |
a17a75e2 MW |
484 | return retval; |
485 | ||
486 | return bridge->master_set(image, enabled, vme_base, size, aspace, | |
487 | cycle, dwidth); | |
488 | } | |
489 | EXPORT_SYMBOL(vme_master_set); | |
490 | ||
ead1f3e3 | 491 | int vme_master_get(struct vme_resource *resource, int *enabled, |
a17a75e2 MW |
492 | unsigned long long *vme_base, unsigned long long *size, |
493 | vme_address_t *aspace, vme_cycle_t *cycle, vme_width_t *dwidth) | |
494 | { | |
495 | struct vme_bridge *bridge = find_bridge(resource); | |
496 | struct vme_master_resource *image; | |
497 | ||
498 | if (resource->type != VME_MASTER) { | |
ead1f3e3 | 499 | printk(KERN_ERR "Not a master resource\n"); |
a17a75e2 MW |
500 | return -EINVAL; |
501 | } | |
502 | ||
503 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
504 | ||
51a569f7 | 505 | if (bridge->master_get == NULL) { |
ead1f3e3 | 506 | printk(KERN_WARNING "vme_master_set not supported\n"); |
a17a75e2 MW |
507 | return -EINVAL; |
508 | } | |
509 | ||
510 | return bridge->master_get(image, enabled, vme_base, size, aspace, | |
511 | cycle, dwidth); | |
512 | } | |
513 | EXPORT_SYMBOL(vme_master_get); | |
514 | ||
515 | /* | |
516 | * Read data out of VME space into a buffer. | |
517 | */ | |
ead1f3e3 | 518 | ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count, |
a17a75e2 MW |
519 | loff_t offset) |
520 | { | |
521 | struct vme_bridge *bridge = find_bridge(resource); | |
522 | struct vme_master_resource *image; | |
523 | size_t length; | |
524 | ||
525 | if (bridge->master_read == NULL) { | |
ead1f3e3 | 526 | printk(KERN_WARNING "Reading from resource not supported\n"); |
a17a75e2 MW |
527 | return -EINVAL; |
528 | } | |
529 | ||
530 | if (resource->type != VME_MASTER) { | |
ead1f3e3 | 531 | printk(KERN_ERR "Not a master resource\n"); |
a17a75e2 MW |
532 | return -EINVAL; |
533 | } | |
534 | ||
535 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
536 | ||
537 | length = vme_get_size(resource); | |
538 | ||
539 | if (offset > length) { | |
ead1f3e3 | 540 | printk(KERN_WARNING "Invalid Offset\n"); |
a17a75e2 MW |
541 | return -EFAULT; |
542 | } | |
543 | ||
544 | if ((offset + count) > length) | |
545 | count = length - offset; | |
546 | ||
547 | return bridge->master_read(image, buf, count, offset); | |
548 | ||
549 | } | |
550 | EXPORT_SYMBOL(vme_master_read); | |
551 | ||
552 | /* | |
553 | * Write data out to VME space from a buffer. | |
554 | */ | |
ead1f3e3 | 555 | ssize_t vme_master_write(struct vme_resource *resource, void *buf, |
a17a75e2 MW |
556 | size_t count, loff_t offset) |
557 | { | |
558 | struct vme_bridge *bridge = find_bridge(resource); | |
559 | struct vme_master_resource *image; | |
560 | size_t length; | |
561 | ||
562 | if (bridge->master_write == NULL) { | |
ead1f3e3 | 563 | printk(KERN_WARNING "Writing to resource not supported\n"); |
a17a75e2 MW |
564 | return -EINVAL; |
565 | } | |
566 | ||
567 | if (resource->type != VME_MASTER) { | |
ead1f3e3 | 568 | printk(KERN_ERR "Not a master resource\n"); |
a17a75e2 MW |
569 | return -EINVAL; |
570 | } | |
571 | ||
572 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
573 | ||
574 | length = vme_get_size(resource); | |
575 | ||
576 | if (offset > length) { | |
ead1f3e3 | 577 | printk(KERN_WARNING "Invalid Offset\n"); |
a17a75e2 MW |
578 | return -EFAULT; |
579 | } | |
580 | ||
581 | if ((offset + count) > length) | |
582 | count = length - offset; | |
583 | ||
584 | return bridge->master_write(image, buf, count, offset); | |
585 | } | |
586 | EXPORT_SYMBOL(vme_master_write); | |
587 | ||
588 | /* | |
589 | * Perform RMW cycle to provided location. | |
590 | */ | |
ead1f3e3 | 591 | unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask, |
a17a75e2 MW |
592 | unsigned int compare, unsigned int swap, loff_t offset) |
593 | { | |
594 | struct vme_bridge *bridge = find_bridge(resource); | |
595 | struct vme_master_resource *image; | |
596 | ||
597 | if (bridge->master_rmw == NULL) { | |
ead1f3e3 | 598 | printk(KERN_WARNING "Writing to resource not supported\n"); |
a17a75e2 MW |
599 | return -EINVAL; |
600 | } | |
601 | ||
602 | if (resource->type != VME_MASTER) { | |
ead1f3e3 | 603 | printk(KERN_ERR "Not a master resource\n"); |
a17a75e2 MW |
604 | return -EINVAL; |
605 | } | |
606 | ||
607 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
608 | ||
609 | return bridge->master_rmw(image, mask, compare, swap, offset); | |
610 | } | |
611 | EXPORT_SYMBOL(vme_master_rmw); | |
612 | ||
613 | void vme_master_free(struct vme_resource *resource) | |
614 | { | |
615 | struct vme_master_resource *master_image; | |
616 | ||
617 | if (resource->type != VME_MASTER) { | |
ead1f3e3 | 618 | printk(KERN_ERR "Not a master resource\n"); |
a17a75e2 MW |
619 | return; |
620 | } | |
621 | ||
622 | master_image = list_entry(resource->entry, struct vme_master_resource, | |
623 | list); | |
624 | if (master_image == NULL) { | |
ead1f3e3 | 625 | printk(KERN_ERR "Can't find master resource\n"); |
a17a75e2 MW |
626 | return; |
627 | } | |
628 | ||
629 | /* Unlock image */ | |
630 | spin_lock(&(master_image->lock)); | |
631 | if (master_image->locked == 0) | |
632 | printk(KERN_ERR "Image is already free\n"); | |
633 | ||
634 | master_image->locked = 0; | |
635 | spin_unlock(&(master_image->lock)); | |
636 | ||
637 | /* Free up resource memory */ | |
638 | kfree(resource); | |
639 | } | |
640 | EXPORT_SYMBOL(vme_master_free); | |
641 | ||
642 | /* | |
643 | * Request a DMA controller with specific attributes, return some unique | |
644 | * identifier. | |
645 | */ | |
58e50798 | 646 | struct vme_resource *vme_dma_request(struct device *dev) |
a17a75e2 MW |
647 | { |
648 | struct vme_bridge *bridge; | |
649 | struct list_head *dma_pos = NULL; | |
650 | struct vme_dma_resource *allocated_ctrlr = NULL; | |
651 | struct vme_dma_resource *dma_ctrlr = NULL; | |
652 | struct vme_resource *resource = NULL; | |
653 | ||
654 | /* XXX Not checking resource attributes */ | |
655 | printk(KERN_ERR "No VME resource Attribute tests done\n"); | |
656 | ||
657 | bridge = dev_to_bridge(dev); | |
658 | if (bridge == NULL) { | |
659 | printk(KERN_ERR "Can't find VME bus\n"); | |
660 | goto err_bus; | |
661 | } | |
662 | ||
663 | /* Loop through DMA resources */ | |
664 | list_for_each(dma_pos, &(bridge->dma_resources)) { | |
665 | dma_ctrlr = list_entry(dma_pos, | |
666 | struct vme_dma_resource, list); | |
667 | ||
668 | if (dma_ctrlr == NULL) { | |
ead1f3e3 | 669 | printk(KERN_ERR "Registered NULL DMA resource\n"); |
a17a75e2 MW |
670 | continue; |
671 | } | |
672 | ||
673 | /* Find an unlocked controller */ | |
400822fe | 674 | mutex_lock(&(dma_ctrlr->mtx)); |
ead1f3e3 | 675 | if (dma_ctrlr->locked == 0) { |
a17a75e2 | 676 | dma_ctrlr->locked = 1; |
400822fe | 677 | mutex_unlock(&(dma_ctrlr->mtx)); |
a17a75e2 MW |
678 | allocated_ctrlr = dma_ctrlr; |
679 | break; | |
680 | } | |
400822fe | 681 | mutex_unlock(&(dma_ctrlr->mtx)); |
a17a75e2 MW |
682 | } |
683 | ||
684 | /* Check to see if we found a resource */ | |
685 | if (allocated_ctrlr == NULL) | |
686 | goto err_ctrlr; | |
687 | ||
688 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
689 | if (resource == NULL) { | |
690 | printk(KERN_WARNING "Unable to allocate resource structure\n"); | |
691 | goto err_alloc; | |
692 | } | |
693 | resource->type = VME_DMA; | |
694 | resource->entry = &(allocated_ctrlr->list); | |
695 | ||
696 | return resource; | |
697 | ||
698 | err_alloc: | |
699 | /* Unlock image */ | |
400822fe | 700 | mutex_lock(&(dma_ctrlr->mtx)); |
a17a75e2 | 701 | dma_ctrlr->locked = 0; |
400822fe | 702 | mutex_unlock(&(dma_ctrlr->mtx)); |
a17a75e2 MW |
703 | err_ctrlr: |
704 | err_bus: | |
705 | return NULL; | |
706 | } | |
58e50798 | 707 | EXPORT_SYMBOL(vme_dma_request); |
a17a75e2 MW |
708 | |
709 | /* | |
710 | * Start new list | |
711 | */ | |
712 | struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource) | |
713 | { | |
714 | struct vme_dma_resource *ctrlr; | |
715 | struct vme_dma_list *dma_list; | |
716 | ||
717 | if (resource->type != VME_DMA) { | |
ead1f3e3 | 718 | printk(KERN_ERR "Not a DMA resource\n"); |
a17a75e2 MW |
719 | return NULL; |
720 | } | |
721 | ||
722 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); | |
723 | ||
ead1f3e3 MW |
724 | dma_list = kmalloc(sizeof(struct vme_dma_list), GFP_KERNEL); |
725 | if (dma_list == NULL) { | |
726 | printk(KERN_ERR "Unable to allocate memory for new dma list\n"); | |
a17a75e2 MW |
727 | return NULL; |
728 | } | |
729 | INIT_LIST_HEAD(&(dma_list->entries)); | |
730 | dma_list->parent = ctrlr; | |
400822fe | 731 | mutex_init(&(dma_list->mtx)); |
a17a75e2 MW |
732 | |
733 | return dma_list; | |
734 | } | |
735 | EXPORT_SYMBOL(vme_new_dma_list); | |
736 | ||
737 | /* | |
738 | * Create "Pattern" type attributes | |
739 | */ | |
740 | struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, | |
741 | vme_pattern_t type) | |
742 | { | |
743 | struct vme_dma_attr *attributes; | |
744 | struct vme_dma_pattern *pattern_attr; | |
745 | ||
ead1f3e3 MW |
746 | attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL); |
747 | if (attributes == NULL) { | |
748 | printk(KERN_ERR "Unable to allocate memory for attributes " | |
749 | "structure\n"); | |
a17a75e2 MW |
750 | goto err_attr; |
751 | } | |
752 | ||
ead1f3e3 MW |
753 | pattern_attr = kmalloc(sizeof(struct vme_dma_pattern), GFP_KERNEL); |
754 | if (pattern_attr == NULL) { | |
755 | printk(KERN_ERR "Unable to allocate memory for pattern " | |
756 | "attributes\n"); | |
a17a75e2 MW |
757 | goto err_pat; |
758 | } | |
759 | ||
760 | attributes->type = VME_DMA_PATTERN; | |
761 | attributes->private = (void *)pattern_attr; | |
762 | ||
763 | pattern_attr->pattern = pattern; | |
764 | pattern_attr->type = type; | |
765 | ||
766 | return attributes; | |
767 | ||
768 | kfree(pattern_attr); | |
769 | err_pat: | |
770 | kfree(attributes); | |
771 | err_attr: | |
772 | return NULL; | |
773 | } | |
774 | EXPORT_SYMBOL(vme_dma_pattern_attribute); | |
775 | ||
776 | /* | |
777 | * Create "PCI" type attributes | |
778 | */ | |
779 | struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address) | |
780 | { | |
781 | struct vme_dma_attr *attributes; | |
782 | struct vme_dma_pci *pci_attr; | |
783 | ||
784 | /* XXX Run some sanity checks here */ | |
785 | ||
ead1f3e3 MW |
786 | attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL); |
787 | if (attributes == NULL) { | |
788 | printk(KERN_ERR "Unable to allocate memory for attributes " | |
789 | "structure\n"); | |
a17a75e2 MW |
790 | goto err_attr; |
791 | } | |
792 | ||
ead1f3e3 MW |
793 | pci_attr = kmalloc(sizeof(struct vme_dma_pci), GFP_KERNEL); |
794 | if (pci_attr == NULL) { | |
795 | printk(KERN_ERR "Unable to allocate memory for pci " | |
796 | "attributes\n"); | |
a17a75e2 MW |
797 | goto err_pci; |
798 | } | |
799 | ||
800 | ||
801 | ||
802 | attributes->type = VME_DMA_PCI; | |
803 | attributes->private = (void *)pci_attr; | |
804 | ||
805 | pci_attr->address = address; | |
806 | ||
807 | return attributes; | |
808 | ||
809 | kfree(pci_attr); | |
810 | err_pci: | |
811 | kfree(attributes); | |
812 | err_attr: | |
813 | return NULL; | |
814 | } | |
815 | EXPORT_SYMBOL(vme_dma_pci_attribute); | |
816 | ||
817 | /* | |
818 | * Create "VME" type attributes | |
819 | */ | |
820 | struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address, | |
821 | vme_address_t aspace, vme_cycle_t cycle, vme_width_t dwidth) | |
822 | { | |
823 | struct vme_dma_attr *attributes; | |
824 | struct vme_dma_vme *vme_attr; | |
825 | ||
826 | /* XXX Run some sanity checks here */ | |
827 | ||
ead1f3e3 | 828 | attributes = kmalloc( |
a17a75e2 | 829 | sizeof(struct vme_dma_attr), GFP_KERNEL); |
ead1f3e3 MW |
830 | if (attributes == NULL) { |
831 | printk(KERN_ERR "Unable to allocate memory for attributes " | |
832 | "structure\n"); | |
a17a75e2 MW |
833 | goto err_attr; |
834 | } | |
835 | ||
ead1f3e3 MW |
836 | vme_attr = kmalloc(sizeof(struct vme_dma_vme), GFP_KERNEL); |
837 | if (vme_attr == NULL) { | |
838 | printk(KERN_ERR "Unable to allocate memory for vme " | |
839 | "attributes\n"); | |
a17a75e2 MW |
840 | goto err_vme; |
841 | } | |
842 | ||
843 | attributes->type = VME_DMA_VME; | |
844 | attributes->private = (void *)vme_attr; | |
845 | ||
846 | vme_attr->address = address; | |
847 | vme_attr->aspace = aspace; | |
848 | vme_attr->cycle = cycle; | |
849 | vme_attr->dwidth = dwidth; | |
850 | ||
851 | return attributes; | |
852 | ||
853 | kfree(vme_attr); | |
854 | err_vme: | |
855 | kfree(attributes); | |
856 | err_attr: | |
857 | return NULL; | |
858 | } | |
859 | EXPORT_SYMBOL(vme_dma_vme_attribute); | |
860 | ||
861 | /* | |
862 | * Free attribute | |
863 | */ | |
864 | void vme_dma_free_attribute(struct vme_dma_attr *attributes) | |
865 | { | |
866 | kfree(attributes->private); | |
867 | kfree(attributes); | |
868 | } | |
869 | EXPORT_SYMBOL(vme_dma_free_attribute); | |
870 | ||
871 | int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src, | |
872 | struct vme_dma_attr *dest, size_t count) | |
873 | { | |
874 | struct vme_bridge *bridge = list->parent->parent; | |
875 | int retval; | |
876 | ||
877 | if (bridge->dma_list_add == NULL) { | |
ead1f3e3 | 878 | printk(KERN_WARNING "Link List DMA generation not supported\n"); |
a17a75e2 MW |
879 | return -EINVAL; |
880 | } | |
881 | ||
a5c330fe | 882 | if (!mutex_trylock(&(list->mtx))) { |
ead1f3e3 | 883 | printk(KERN_ERR "Link List already submitted\n"); |
a17a75e2 MW |
884 | return -EINVAL; |
885 | } | |
886 | ||
887 | retval = bridge->dma_list_add(list, src, dest, count); | |
888 | ||
400822fe | 889 | mutex_unlock(&(list->mtx)); |
a17a75e2 MW |
890 | |
891 | return retval; | |
892 | } | |
893 | EXPORT_SYMBOL(vme_dma_list_add); | |
894 | ||
895 | int vme_dma_list_exec(struct vme_dma_list *list) | |
896 | { | |
897 | struct vme_bridge *bridge = list->parent->parent; | |
898 | int retval; | |
899 | ||
900 | if (bridge->dma_list_exec == NULL) { | |
ead1f3e3 | 901 | printk(KERN_ERR "Link List DMA execution not supported\n"); |
a17a75e2 MW |
902 | return -EINVAL; |
903 | } | |
904 | ||
400822fe | 905 | mutex_lock(&(list->mtx)); |
a17a75e2 MW |
906 | |
907 | retval = bridge->dma_list_exec(list); | |
908 | ||
400822fe | 909 | mutex_unlock(&(list->mtx)); |
a17a75e2 MW |
910 | |
911 | return retval; | |
912 | } | |
913 | EXPORT_SYMBOL(vme_dma_list_exec); | |
914 | ||
915 | int vme_dma_list_free(struct vme_dma_list *list) | |
916 | { | |
917 | struct vme_bridge *bridge = list->parent->parent; | |
918 | int retval; | |
919 | ||
920 | if (bridge->dma_list_empty == NULL) { | |
ead1f3e3 | 921 | printk(KERN_WARNING "Emptying of Link Lists not supported\n"); |
a17a75e2 MW |
922 | return -EINVAL; |
923 | } | |
924 | ||
a5c330fe | 925 | if (!mutex_trylock(&(list->mtx))) { |
ead1f3e3 | 926 | printk(KERN_ERR "Link List in use\n"); |
a17a75e2 MW |
927 | return -EINVAL; |
928 | } | |
929 | ||
930 | /* | |
931 | * Empty out all of the entries from the dma list. We need to go to the | |
932 | * low level driver as dma entries are driver specific. | |
933 | */ | |
934 | retval = bridge->dma_list_empty(list); | |
935 | if (retval) { | |
ead1f3e3 | 936 | printk(KERN_ERR "Unable to empty link-list entries\n"); |
400822fe | 937 | mutex_unlock(&(list->mtx)); |
a17a75e2 MW |
938 | return retval; |
939 | } | |
400822fe | 940 | mutex_unlock(&(list->mtx)); |
a17a75e2 MW |
941 | kfree(list); |
942 | ||
943 | return retval; | |
944 | } | |
945 | EXPORT_SYMBOL(vme_dma_list_free); | |
946 | ||
947 | int vme_dma_free(struct vme_resource *resource) | |
948 | { | |
949 | struct vme_dma_resource *ctrlr; | |
950 | ||
951 | if (resource->type != VME_DMA) { | |
ead1f3e3 | 952 | printk(KERN_ERR "Not a DMA resource\n"); |
a17a75e2 MW |
953 | return -EINVAL; |
954 | } | |
955 | ||
956 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); | |
957 | ||
a5c330fe | 958 | if (!mutex_trylock(&(ctrlr->mtx))) { |
ead1f3e3 | 959 | printk(KERN_ERR "Resource busy, can't free\n"); |
a17a75e2 MW |
960 | return -EBUSY; |
961 | } | |
962 | ||
963 | if (!(list_empty(&(ctrlr->pending)) && list_empty(&(ctrlr->running)))) { | |
ead1f3e3 | 964 | printk(KERN_WARNING "Resource still processing transfers\n"); |
400822fe | 965 | mutex_unlock(&(ctrlr->mtx)); |
a17a75e2 MW |
966 | return -EBUSY; |
967 | } | |
968 | ||
969 | ctrlr->locked = 0; | |
970 | ||
400822fe | 971 | mutex_unlock(&(ctrlr->mtx)); |
a17a75e2 MW |
972 | |
973 | return 0; | |
974 | } | |
975 | EXPORT_SYMBOL(vme_dma_free); | |
976 | ||
c813f592 MW |
977 | void vme_irq_handler(struct vme_bridge *bridge, int level, int statid) |
978 | { | |
979 | void (*call)(int, int, void *); | |
980 | void *priv_data; | |
981 | ||
982 | call = bridge->irq[level - 1].callback[statid].func; | |
983 | priv_data = bridge->irq[level - 1].callback[statid].priv_data; | |
984 | ||
985 | if (call != NULL) | |
986 | call(level, statid, priv_data); | |
987 | else | |
988 | printk(KERN_WARNING "Spurilous VME interrupt, level:%x, " | |
989 | "vector:%x\n", level, statid); | |
990 | } | |
991 | EXPORT_SYMBOL(vme_irq_handler); | |
992 | ||
993 | int vme_irq_request(struct device *dev, int level, int statid, | |
a17a75e2 MW |
994 | void (*callback)(int level, int vector, void *priv_data), |
995 | void *priv_data) | |
996 | { | |
997 | struct vme_bridge *bridge; | |
998 | ||
999 | bridge = dev_to_bridge(dev); | |
1000 | if (bridge == NULL) { | |
1001 | printk(KERN_ERR "Can't find VME bus\n"); | |
1002 | return -EINVAL; | |
1003 | } | |
1004 | ||
ead1f3e3 | 1005 | if ((level < 1) || (level > 7)) { |
c813f592 | 1006 | printk(KERN_ERR "Invalid interrupt level\n"); |
a17a75e2 MW |
1007 | return -EINVAL; |
1008 | } | |
1009 | ||
c813f592 MW |
1010 | if (bridge->irq_set == NULL) { |
1011 | printk(KERN_ERR "Configuring interrupts not supported\n"); | |
a17a75e2 MW |
1012 | return -EINVAL; |
1013 | } | |
1014 | ||
c813f592 MW |
1015 | mutex_lock(&(bridge->irq_mtx)); |
1016 | ||
1017 | if (bridge->irq[level - 1].callback[statid].func) { | |
1018 | mutex_unlock(&(bridge->irq_mtx)); | |
1019 | printk(KERN_WARNING "VME Interrupt already taken\n"); | |
1020 | return -EBUSY; | |
1021 | } | |
1022 | ||
1023 | bridge->irq[level - 1].count++; | |
1024 | bridge->irq[level - 1].callback[statid].priv_data = priv_data; | |
1025 | bridge->irq[level - 1].callback[statid].func = callback; | |
1026 | ||
1027 | /* Enable IRQ level */ | |
1028 | bridge->irq_set(level, 1, 1); | |
1029 | ||
1030 | mutex_unlock(&(bridge->irq_mtx)); | |
1031 | ||
1032 | return 0; | |
a17a75e2 | 1033 | } |
c813f592 | 1034 | EXPORT_SYMBOL(vme_irq_request); |
a17a75e2 | 1035 | |
c813f592 | 1036 | void vme_irq_free(struct device *dev, int level, int statid) |
a17a75e2 MW |
1037 | { |
1038 | struct vme_bridge *bridge; | |
1039 | ||
1040 | bridge = dev_to_bridge(dev); | |
1041 | if (bridge == NULL) { | |
1042 | printk(KERN_ERR "Can't find VME bus\n"); | |
1043 | return; | |
1044 | } | |
1045 | ||
ead1f3e3 | 1046 | if ((level < 1) || (level > 7)) { |
c813f592 | 1047 | printk(KERN_ERR "Invalid interrupt level\n"); |
a17a75e2 MW |
1048 | return; |
1049 | } | |
1050 | ||
c813f592 MW |
1051 | if (bridge->irq_set == NULL) { |
1052 | printk(KERN_ERR "Configuring interrupts not supported\n"); | |
a17a75e2 MW |
1053 | return; |
1054 | } | |
1055 | ||
c813f592 MW |
1056 | mutex_lock(&(bridge->irq_mtx)); |
1057 | ||
1058 | bridge->irq[level - 1].count--; | |
1059 | ||
1060 | /* Disable IRQ level if no more interrupts attached at this level*/ | |
1061 | if (bridge->irq[level - 1].count == 0) | |
1062 | bridge->irq_set(level, 0, 1); | |
1063 | ||
1064 | bridge->irq[level - 1].callback[statid].func = NULL; | |
1065 | bridge->irq[level - 1].callback[statid].priv_data = NULL; | |
1066 | ||
1067 | mutex_unlock(&(bridge->irq_mtx)); | |
a17a75e2 | 1068 | } |
c813f592 | 1069 | EXPORT_SYMBOL(vme_irq_free); |
a17a75e2 | 1070 | |
c813f592 | 1071 | int vme_irq_generate(struct device *dev, int level, int statid) |
a17a75e2 MW |
1072 | { |
1073 | struct vme_bridge *bridge; | |
1074 | ||
1075 | bridge = dev_to_bridge(dev); | |
1076 | if (bridge == NULL) { | |
1077 | printk(KERN_ERR "Can't find VME bus\n"); | |
1078 | return -EINVAL; | |
1079 | } | |
1080 | ||
ead1f3e3 | 1081 | if ((level < 1) || (level > 7)) { |
a17a75e2 MW |
1082 | printk(KERN_WARNING "Invalid interrupt level\n"); |
1083 | return -EINVAL; | |
1084 | } | |
1085 | ||
c813f592 | 1086 | if (bridge->irq_generate == NULL) { |
ead1f3e3 | 1087 | printk(KERN_WARNING "Interrupt generation not supported\n"); |
a17a75e2 MW |
1088 | return -EINVAL; |
1089 | } | |
1090 | ||
c813f592 | 1091 | return bridge->irq_generate(level, statid); |
a17a75e2 | 1092 | } |
c813f592 | 1093 | EXPORT_SYMBOL(vme_irq_generate); |
a17a75e2 | 1094 | |
42fb5031 MW |
1095 | /* |
1096 | * Request the location monitor, return resource or NULL | |
1097 | */ | |
1098 | struct vme_resource *vme_lm_request(struct device *dev) | |
a17a75e2 MW |
1099 | { |
1100 | struct vme_bridge *bridge; | |
42fb5031 MW |
1101 | struct list_head *lm_pos = NULL; |
1102 | struct vme_lm_resource *allocated_lm = NULL; | |
1103 | struct vme_lm_resource *lm = NULL; | |
1104 | struct vme_resource *resource = NULL; | |
a17a75e2 MW |
1105 | |
1106 | bridge = dev_to_bridge(dev); | |
1107 | if (bridge == NULL) { | |
1108 | printk(KERN_ERR "Can't find VME bus\n"); | |
42fb5031 MW |
1109 | goto err_bus; |
1110 | } | |
1111 | ||
1112 | /* Loop through DMA resources */ | |
1113 | list_for_each(lm_pos, &(bridge->lm_resources)) { | |
1114 | lm = list_entry(lm_pos, | |
1115 | struct vme_lm_resource, list); | |
1116 | ||
1117 | if (lm == NULL) { | |
1118 | printk(KERN_ERR "Registered NULL Location Monitor " | |
1119 | "resource\n"); | |
1120 | continue; | |
1121 | } | |
1122 | ||
1123 | /* Find an unlocked controller */ | |
1124 | mutex_lock(&(lm->mtx)); | |
1125 | if (lm->locked == 0) { | |
1126 | lm->locked = 1; | |
1127 | mutex_unlock(&(lm->mtx)); | |
1128 | allocated_lm = lm; | |
1129 | break; | |
1130 | } | |
1131 | mutex_unlock(&(lm->mtx)); | |
1132 | } | |
1133 | ||
1134 | /* Check to see if we found a resource */ | |
1135 | if (allocated_lm == NULL) | |
1136 | goto err_lm; | |
1137 | ||
1138 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
1139 | if (resource == NULL) { | |
1140 | printk(KERN_ERR "Unable to allocate resource structure\n"); | |
1141 | goto err_alloc; | |
1142 | } | |
1143 | resource->type = VME_LM; | |
1144 | resource->entry = &(allocated_lm->list); | |
1145 | ||
1146 | return resource; | |
1147 | ||
1148 | err_alloc: | |
1149 | /* Unlock image */ | |
1150 | mutex_lock(&(lm->mtx)); | |
1151 | lm->locked = 0; | |
1152 | mutex_unlock(&(lm->mtx)); | |
1153 | err_lm: | |
1154 | err_bus: | |
1155 | return NULL; | |
1156 | } | |
1157 | EXPORT_SYMBOL(vme_lm_request); | |
1158 | ||
1159 | int vme_lm_count(struct vme_resource *resource) | |
1160 | { | |
1161 | struct vme_lm_resource *lm; | |
1162 | ||
1163 | if (resource->type != VME_LM) { | |
1164 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1165 | return -EINVAL; | |
1166 | } | |
1167 | ||
1168 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1169 | ||
1170 | return lm->monitors; | |
1171 | } | |
1172 | EXPORT_SYMBOL(vme_lm_count); | |
1173 | ||
1174 | int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base, | |
1175 | vme_address_t aspace, vme_cycle_t cycle) | |
1176 | { | |
1177 | struct vme_bridge *bridge = find_bridge(resource); | |
1178 | struct vme_lm_resource *lm; | |
1179 | ||
1180 | if (resource->type != VME_LM) { | |
1181 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1182 | return -EINVAL; |
1183 | } | |
1184 | ||
42fb5031 MW |
1185 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1186 | ||
a17a75e2 | 1187 | if (bridge->lm_set == NULL) { |
42fb5031 | 1188 | printk(KERN_ERR "vme_lm_set not supported\n"); |
a17a75e2 MW |
1189 | return -EINVAL; |
1190 | } | |
1191 | ||
42fb5031 MW |
1192 | /* XXX Check parameters */ |
1193 | ||
8be9226c | 1194 | return bridge->lm_set(lm, lm_base, aspace, cycle); |
a17a75e2 MW |
1195 | } |
1196 | EXPORT_SYMBOL(vme_lm_set); | |
1197 | ||
42fb5031 MW |
1198 | int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base, |
1199 | vme_address_t *aspace, vme_cycle_t *cycle) | |
a17a75e2 | 1200 | { |
42fb5031 MW |
1201 | struct vme_bridge *bridge = find_bridge(resource); |
1202 | struct vme_lm_resource *lm; | |
a17a75e2 | 1203 | |
42fb5031 MW |
1204 | if (resource->type != VME_LM) { |
1205 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1206 | return -EINVAL; |
1207 | } | |
1208 | ||
42fb5031 MW |
1209 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1210 | ||
a17a75e2 | 1211 | if (bridge->lm_get == NULL) { |
42fb5031 | 1212 | printk(KERN_ERR "vme_lm_get not supported\n"); |
a17a75e2 MW |
1213 | return -EINVAL; |
1214 | } | |
1215 | ||
42fb5031 | 1216 | return bridge->lm_get(lm, lm_base, aspace, cycle); |
a17a75e2 MW |
1217 | } |
1218 | EXPORT_SYMBOL(vme_lm_get); | |
1219 | ||
42fb5031 MW |
1220 | int vme_lm_attach(struct vme_resource *resource, int monitor, |
1221 | void (*callback)(int)) | |
a17a75e2 | 1222 | { |
42fb5031 MW |
1223 | struct vme_bridge *bridge = find_bridge(resource); |
1224 | struct vme_lm_resource *lm; | |
a17a75e2 | 1225 | |
42fb5031 MW |
1226 | if (resource->type != VME_LM) { |
1227 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1228 | return -EINVAL; |
1229 | } | |
1230 | ||
42fb5031 MW |
1231 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1232 | ||
a17a75e2 | 1233 | if (bridge->lm_attach == NULL) { |
42fb5031 | 1234 | printk(KERN_ERR "vme_lm_attach not supported\n"); |
a17a75e2 MW |
1235 | return -EINVAL; |
1236 | } | |
1237 | ||
42fb5031 | 1238 | return bridge->lm_attach(lm, monitor, callback); |
a17a75e2 MW |
1239 | } |
1240 | EXPORT_SYMBOL(vme_lm_attach); | |
1241 | ||
42fb5031 | 1242 | int vme_lm_detach(struct vme_resource *resource, int monitor) |
a17a75e2 | 1243 | { |
42fb5031 MW |
1244 | struct vme_bridge *bridge = find_bridge(resource); |
1245 | struct vme_lm_resource *lm; | |
a17a75e2 | 1246 | |
42fb5031 MW |
1247 | if (resource->type != VME_LM) { |
1248 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1249 | return -EINVAL; |
1250 | } | |
1251 | ||
42fb5031 MW |
1252 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1253 | ||
a17a75e2 | 1254 | if (bridge->lm_detach == NULL) { |
42fb5031 | 1255 | printk(KERN_ERR "vme_lm_detach not supported\n"); |
a17a75e2 MW |
1256 | return -EINVAL; |
1257 | } | |
1258 | ||
42fb5031 | 1259 | return bridge->lm_detach(lm, monitor); |
a17a75e2 MW |
1260 | } |
1261 | EXPORT_SYMBOL(vme_lm_detach); | |
1262 | ||
42fb5031 MW |
1263 | void vme_lm_free(struct vme_resource *resource) |
1264 | { | |
1265 | struct vme_lm_resource *lm; | |
1266 | ||
1267 | if (resource->type != VME_LM) { | |
1268 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1269 | return; | |
1270 | } | |
1271 | ||
1272 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1273 | ||
8be9226c | 1274 | mutex_lock(&(lm->mtx)); |
42fb5031 | 1275 | |
8be9226c MW |
1276 | /* XXX |
1277 | * Check to see that there aren't any callbacks still attached, if | |
1278 | * there are we should probably be detaching them! | |
1279 | */ | |
42fb5031 MW |
1280 | |
1281 | lm->locked = 0; | |
1282 | ||
1283 | mutex_unlock(&(lm->mtx)); | |
8be9226c MW |
1284 | |
1285 | kfree(resource); | |
42fb5031 MW |
1286 | } |
1287 | EXPORT_SYMBOL(vme_lm_free); | |
1288 | ||
a17a75e2 MW |
1289 | int vme_slot_get(struct device *bus) |
1290 | { | |
1291 | struct vme_bridge *bridge; | |
1292 | ||
1293 | bridge = dev_to_bridge(bus); | |
1294 | if (bridge == NULL) { | |
1295 | printk(KERN_ERR "Can't find VME bus\n"); | |
1296 | return -EINVAL; | |
1297 | } | |
1298 | ||
1299 | if (bridge->slot_get == NULL) { | |
ead1f3e3 | 1300 | printk(KERN_WARNING "vme_slot_get not supported\n"); |
a17a75e2 MW |
1301 | return -EINVAL; |
1302 | } | |
1303 | ||
1304 | return bridge->slot_get(); | |
1305 | } | |
1306 | EXPORT_SYMBOL(vme_slot_get); | |
1307 | ||
1308 | ||
1309 | /* - Bridge Registration --------------------------------------------------- */ | |
1310 | ||
1311 | static int vme_alloc_bus_num(void) | |
1312 | { | |
1313 | int i; | |
1314 | ||
400822fe | 1315 | mutex_lock(&vme_bus_num_mtx); |
a17a75e2 MW |
1316 | for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) { |
1317 | if (((vme_bus_numbers >> i) & 0x1) == 0) { | |
1318 | vme_bus_numbers |= (0x1 << i); | |
1319 | break; | |
1320 | } | |
1321 | } | |
400822fe | 1322 | mutex_unlock(&vme_bus_num_mtx); |
a17a75e2 MW |
1323 | |
1324 | return i; | |
1325 | } | |
1326 | ||
1327 | static void vme_free_bus_num(int bus) | |
1328 | { | |
400822fe | 1329 | mutex_lock(&vme_bus_num_mtx); |
a17a75e2 | 1330 | vme_bus_numbers |= ~(0x1 << bus); |
400822fe | 1331 | mutex_unlock(&vme_bus_num_mtx); |
a17a75e2 MW |
1332 | } |
1333 | ||
ead1f3e3 | 1334 | int vme_register_bridge(struct vme_bridge *bridge) |
a17a75e2 MW |
1335 | { |
1336 | struct device *dev; | |
1337 | int retval; | |
1338 | int i; | |
1339 | ||
1340 | bridge->num = vme_alloc_bus_num(); | |
1341 | ||
1342 | /* This creates 32 vme "slot" devices. This equates to a slot for each | |
1343 | * ID available in a system conforming to the ANSI/VITA 1-1994 | |
1344 | * specification. | |
1345 | */ | |
1346 | for (i = 0; i < VME_SLOTS_MAX; i++) { | |
1347 | dev = &(bridge->dev[i]); | |
1348 | memset(dev, 0, sizeof(struct device)); | |
1349 | ||
1350 | dev->parent = bridge->parent; | |
1351 | dev->bus = &(vme_bus_type); | |
1352 | /* | |
1353 | * We save a pointer to the bridge in platform_data so that we | |
1354 | * can get to it later. We keep driver_data for use by the | |
1355 | * driver that binds against the slot | |
1356 | */ | |
1357 | dev->platform_data = bridge; | |
1358 | dev_set_name(dev, "vme-%x.%x", bridge->num, i + 1); | |
1359 | ||
1360 | retval = device_register(dev); | |
ead1f3e3 | 1361 | if (retval) |
a17a75e2 MW |
1362 | goto err_reg; |
1363 | } | |
1364 | ||
1365 | return retval; | |
1366 | ||
1367 | i = VME_SLOTS_MAX; | |
1368 | err_reg: | |
1369 | while (i > -1) { | |
1370 | dev = &(bridge->dev[i]); | |
1371 | device_unregister(dev); | |
1372 | } | |
1373 | vme_free_bus_num(bridge->num); | |
1374 | return retval; | |
1375 | } | |
1376 | EXPORT_SYMBOL(vme_register_bridge); | |
1377 | ||
ead1f3e3 | 1378 | void vme_unregister_bridge(struct vme_bridge *bridge) |
a17a75e2 MW |
1379 | { |
1380 | int i; | |
1381 | struct device *dev; | |
1382 | ||
1383 | ||
1384 | for (i = 0; i < VME_SLOTS_MAX; i++) { | |
1385 | dev = &(bridge->dev[i]); | |
1386 | device_unregister(dev); | |
1387 | } | |
1388 | vme_free_bus_num(bridge->num); | |
1389 | } | |
1390 | EXPORT_SYMBOL(vme_unregister_bridge); | |
1391 | ||
1392 | ||
1393 | /* - Driver Registration --------------------------------------------------- */ | |
1394 | ||
ead1f3e3 | 1395 | int vme_register_driver(struct vme_driver *drv) |
a17a75e2 MW |
1396 | { |
1397 | drv->driver.name = drv->name; | |
1398 | drv->driver.bus = &vme_bus_type; | |
1399 | ||
1400 | return driver_register(&drv->driver); | |
1401 | } | |
1402 | EXPORT_SYMBOL(vme_register_driver); | |
1403 | ||
ead1f3e3 | 1404 | void vme_unregister_driver(struct vme_driver *drv) |
a17a75e2 MW |
1405 | { |
1406 | driver_unregister(&drv->driver); | |
1407 | } | |
1408 | EXPORT_SYMBOL(vme_unregister_driver); | |
1409 | ||
1410 | /* - Bus Registration ------------------------------------------------------ */ | |
1411 | ||
1412 | int vme_calc_slot(struct device *dev) | |
1413 | { | |
1414 | struct vme_bridge *bridge; | |
1415 | int num; | |
1416 | ||
1417 | bridge = dev_to_bridge(dev); | |
1418 | ||
1419 | /* Determine slot number */ | |
1420 | num = 0; | |
ead1f3e3 MW |
1421 | while (num < VME_SLOTS_MAX) { |
1422 | if (&(bridge->dev[num]) == dev) | |
a17a75e2 | 1423 | break; |
ead1f3e3 | 1424 | |
a17a75e2 MW |
1425 | num++; |
1426 | } | |
1427 | if (num == VME_SLOTS_MAX) { | |
1428 | dev_err(dev, "Failed to identify slot\n"); | |
1429 | num = 0; | |
1430 | goto err_dev; | |
1431 | } | |
1432 | num++; | |
1433 | ||
1434 | err_dev: | |
1435 | return num; | |
1436 | } | |
1437 | ||
1438 | static struct vme_driver *dev_to_vme_driver(struct device *dev) | |
1439 | { | |
ead1f3e3 MW |
1440 | if (dev->driver == NULL) |
1441 | printk(KERN_ERR "Bugger dev->driver is NULL\n"); | |
a17a75e2 MW |
1442 | |
1443 | return container_of(dev->driver, struct vme_driver, driver); | |
1444 | } | |
1445 | ||
1446 | static int vme_bus_match(struct device *dev, struct device_driver *drv) | |
1447 | { | |
1448 | struct vme_bridge *bridge; | |
1449 | struct vme_driver *driver; | |
1450 | int i, num; | |
1451 | ||
1452 | bridge = dev_to_bridge(dev); | |
1453 | driver = container_of(drv, struct vme_driver, driver); | |
1454 | ||
1455 | num = vme_calc_slot(dev); | |
1456 | if (!num) | |
1457 | goto err_dev; | |
1458 | ||
1459 | if (driver->bind_table == NULL) { | |
1460 | dev_err(dev, "Bind table NULL\n"); | |
1461 | goto err_table; | |
1462 | } | |
1463 | ||
1464 | i = 0; | |
ead1f3e3 | 1465 | while ((driver->bind_table[i].bus != 0) || |
a17a75e2 MW |
1466 | (driver->bind_table[i].slot != 0)) { |
1467 | ||
a37b0dad MW |
1468 | if (bridge->num == driver->bind_table[i].bus) { |
1469 | if (num == driver->bind_table[i].slot) | |
1470 | return 1; | |
1471 | ||
1472 | if (driver->bind_table[i].slot == VME_SLOT_ALL) | |
1473 | return 1; | |
1474 | ||
1475 | if ((driver->bind_table[i].slot == VME_SLOT_CURRENT) && | |
1476 | (num == vme_slot_get(dev))) | |
1477 | return 1; | |
1478 | } | |
a17a75e2 MW |
1479 | i++; |
1480 | } | |
1481 | ||
1482 | err_dev: | |
1483 | err_table: | |
1484 | return 0; | |
1485 | } | |
1486 | ||
1487 | static int vme_bus_probe(struct device *dev) | |
1488 | { | |
1489 | struct vme_bridge *bridge; | |
1490 | struct vme_driver *driver; | |
1491 | int retval = -ENODEV; | |
1492 | ||
1493 | driver = dev_to_vme_driver(dev); | |
1494 | bridge = dev_to_bridge(dev); | |
1495 | ||
ead1f3e3 | 1496 | if (driver->probe != NULL) |
a17a75e2 | 1497 | retval = driver->probe(dev, bridge->num, vme_calc_slot(dev)); |
a17a75e2 MW |
1498 | |
1499 | return retval; | |
1500 | } | |
1501 | ||
1502 | static int vme_bus_remove(struct device *dev) | |
1503 | { | |
1504 | struct vme_bridge *bridge; | |
1505 | struct vme_driver *driver; | |
1506 | int retval = -ENODEV; | |
1507 | ||
1508 | driver = dev_to_vme_driver(dev); | |
1509 | bridge = dev_to_bridge(dev); | |
1510 | ||
ead1f3e3 | 1511 | if (driver->remove != NULL) |
a17a75e2 | 1512 | retval = driver->remove(dev, bridge->num, vme_calc_slot(dev)); |
a17a75e2 MW |
1513 | |
1514 | return retval; | |
1515 | } | |
1516 | ||
1517 | struct bus_type vme_bus_type = { | |
1518 | .name = "vme", | |
1519 | .match = vme_bus_match, | |
1520 | .probe = vme_bus_probe, | |
1521 | .remove = vme_bus_remove, | |
1522 | }; | |
1523 | EXPORT_SYMBOL(vme_bus_type); | |
1524 | ||
ead1f3e3 | 1525 | static int __init vme_init(void) |
a17a75e2 MW |
1526 | { |
1527 | return bus_register(&vme_bus_type); | |
1528 | } | |
1529 | ||
ead1f3e3 | 1530 | static void __exit vme_exit(void) |
a17a75e2 MW |
1531 | { |
1532 | bus_unregister(&vme_bus_type); | |
1533 | } | |
1534 | ||
1535 | MODULE_DESCRIPTION("VME bridge driver framework"); | |
1536 | MODULE_AUTHOR("Martyn Welch <martyn.welch@gefanuc.com"); | |
1537 | MODULE_LICENSE("GPL"); | |
1538 | ||
1539 | module_init(vme_init); | |
1540 | module_exit(vme_exit); |