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a17a75e2 MW |
1 | /* |
2 | * VME Bridge Framework | |
3 | * | |
66bd8db5 MW |
4 | * Author: Martyn Welch <martyn.welch@ge.com> |
5 | * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. | |
a17a75e2 MW |
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 | 31 | #include <linux/spinlock.h> |
5a0e3ad6 | 32 | #include <linux/slab.h> |
a17a75e2 MW |
33 | |
34 | #include "vme.h" | |
35 | #include "vme_bridge.h" | |
36 | ||
400822fe | 37 | /* Bitmask and mutex to keep track of bridge numbers */ |
a17a75e2 | 38 | static unsigned int vme_bus_numbers; |
1fe923ec | 39 | static DEFINE_MUTEX(vme_bus_num_mtx); |
a17a75e2 | 40 | |
ead1f3e3 MW |
41 | static void __exit vme_exit(void); |
42 | static int __init vme_init(void); | |
a17a75e2 MW |
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; | |
42fb5031 MW |
72 | case VME_LM: |
73 | return list_entry(resource->entry, struct vme_lm_resource, | |
74 | list)->parent; | |
75 | break; | |
a17a75e2 MW |
76 | default: |
77 | printk(KERN_ERR "Unknown resource type\n"); | |
78 | return NULL; | |
79 | break; | |
80 | } | |
81 | } | |
82 | ||
83 | /* | |
84 | * Allocate a contiguous block of memory for use by the driver. This is used to | |
85 | * create the buffers for the slave windows. | |
86 | * | |
87 | * XXX VME bridges could be available on buses other than PCI. At the momment | |
88 | * this framework only supports PCI devices. | |
89 | */ | |
ead1f3e3 | 90 | void *vme_alloc_consistent(struct vme_resource *resource, size_t size, |
a17a75e2 MW |
91 | dma_addr_t *dma) |
92 | { | |
93 | struct vme_bridge *bridge; | |
94 | struct pci_dev *pdev; | |
95 | ||
ead1f3e3 MW |
96 | if (resource == NULL) { |
97 | printk(KERN_ERR "No resource\n"); | |
a17a75e2 MW |
98 | return NULL; |
99 | } | |
100 | ||
101 | bridge = find_bridge(resource); | |
ead1f3e3 MW |
102 | if (bridge == NULL) { |
103 | printk(KERN_ERR "Can't find bridge\n"); | |
a17a75e2 MW |
104 | return NULL; |
105 | } | |
106 | ||
107 | /* Find pci_dev container of dev */ | |
108 | if (bridge->parent == NULL) { | |
ead1f3e3 | 109 | printk(KERN_ERR "Dev entry NULL\n"); |
a17a75e2 MW |
110 | return NULL; |
111 | } | |
112 | pdev = container_of(bridge->parent, struct pci_dev, dev); | |
113 | ||
114 | return pci_alloc_consistent(pdev, size, dma); | |
115 | } | |
116 | EXPORT_SYMBOL(vme_alloc_consistent); | |
117 | ||
118 | /* | |
119 | * Free previously allocated contiguous block of memory. | |
120 | * | |
121 | * XXX VME bridges could be available on buses other than PCI. At the momment | |
122 | * this framework only supports PCI devices. | |
123 | */ | |
124 | void vme_free_consistent(struct vme_resource *resource, size_t size, | |
125 | void *vaddr, dma_addr_t dma) | |
126 | { | |
127 | struct vme_bridge *bridge; | |
128 | struct pci_dev *pdev; | |
129 | ||
ead1f3e3 MW |
130 | if (resource == NULL) { |
131 | printk(KERN_ERR "No resource\n"); | |
a17a75e2 MW |
132 | return; |
133 | } | |
134 | ||
135 | bridge = find_bridge(resource); | |
ead1f3e3 MW |
136 | if (bridge == NULL) { |
137 | printk(KERN_ERR "Can't find bridge\n"); | |
a17a75e2 MW |
138 | return; |
139 | } | |
140 | ||
141 | /* Find pci_dev container of dev */ | |
142 | pdev = container_of(bridge->parent, struct pci_dev, dev); | |
143 | ||
144 | pci_free_consistent(pdev, size, vaddr, dma); | |
145 | } | |
146 | EXPORT_SYMBOL(vme_free_consistent); | |
147 | ||
148 | size_t vme_get_size(struct vme_resource *resource) | |
149 | { | |
150 | int enabled, retval; | |
151 | unsigned long long base, size; | |
152 | dma_addr_t buf_base; | |
153 | vme_address_t aspace; | |
154 | vme_cycle_t cycle; | |
155 | vme_width_t dwidth; | |
156 | ||
157 | switch (resource->type) { | |
158 | case VME_MASTER: | |
159 | retval = vme_master_get(resource, &enabled, &base, &size, | |
160 | &aspace, &cycle, &dwidth); | |
161 | ||
162 | return size; | |
163 | break; | |
164 | case VME_SLAVE: | |
165 | retval = vme_slave_get(resource, &enabled, &base, &size, | |
166 | &buf_base, &aspace, &cycle); | |
167 | ||
168 | return size; | |
169 | break; | |
170 | case VME_DMA: | |
171 | return 0; | |
172 | break; | |
173 | default: | |
174 | printk(KERN_ERR "Unknown resource type\n"); | |
175 | return 0; | |
176 | break; | |
177 | } | |
178 | } | |
179 | EXPORT_SYMBOL(vme_get_size); | |
180 | ||
181 | static int vme_check_window(vme_address_t aspace, unsigned long long vme_base, | |
182 | unsigned long long size) | |
183 | { | |
184 | int retval = 0; | |
185 | ||
186 | switch (aspace) { | |
187 | case VME_A16: | |
188 | if (((vme_base + size) > VME_A16_MAX) || | |
189 | (vme_base > VME_A16_MAX)) | |
190 | retval = -EFAULT; | |
191 | break; | |
192 | case VME_A24: | |
193 | if (((vme_base + size) > VME_A24_MAX) || | |
194 | (vme_base > VME_A24_MAX)) | |
195 | retval = -EFAULT; | |
196 | break; | |
197 | case VME_A32: | |
198 | if (((vme_base + size) > VME_A32_MAX) || | |
199 | (vme_base > VME_A32_MAX)) | |
200 | retval = -EFAULT; | |
201 | break; | |
202 | case VME_A64: | |
203 | /* | |
204 | * Any value held in an unsigned long long can be used as the | |
205 | * base | |
206 | */ | |
207 | break; | |
208 | case VME_CRCSR: | |
209 | if (((vme_base + size) > VME_CRCSR_MAX) || | |
210 | (vme_base > VME_CRCSR_MAX)) | |
211 | retval = -EFAULT; | |
212 | break; | |
213 | case VME_USER1: | |
214 | case VME_USER2: | |
215 | case VME_USER3: | |
216 | case VME_USER4: | |
217 | /* User Defined */ | |
218 | break; | |
219 | default: | |
ead1f3e3 | 220 | printk(KERN_ERR "Invalid address space\n"); |
a17a75e2 MW |
221 | retval = -EINVAL; |
222 | break; | |
223 | } | |
224 | ||
225 | return retval; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Request a slave image with specific attributes, return some unique | |
230 | * identifier. | |
231 | */ | |
ead1f3e3 | 232 | struct vme_resource *vme_slave_request(struct device *dev, |
a17a75e2 MW |
233 | vme_address_t address, vme_cycle_t cycle) |
234 | { | |
235 | struct vme_bridge *bridge; | |
236 | struct list_head *slave_pos = NULL; | |
237 | struct vme_slave_resource *allocated_image = NULL; | |
238 | struct vme_slave_resource *slave_image = NULL; | |
239 | struct vme_resource *resource = NULL; | |
240 | ||
241 | bridge = dev_to_bridge(dev); | |
242 | if (bridge == NULL) { | |
243 | printk(KERN_ERR "Can't find VME bus\n"); | |
244 | goto err_bus; | |
245 | } | |
246 | ||
247 | /* Loop through slave resources */ | |
886953e9 | 248 | list_for_each(slave_pos, &bridge->slave_resources) { |
a17a75e2 MW |
249 | slave_image = list_entry(slave_pos, |
250 | struct vme_slave_resource, list); | |
251 | ||
252 | if (slave_image == NULL) { | |
ead1f3e3 | 253 | printk(KERN_ERR "Registered NULL Slave resource\n"); |
a17a75e2 MW |
254 | continue; |
255 | } | |
256 | ||
257 | /* Find an unlocked and compatible image */ | |
886953e9 | 258 | mutex_lock(&slave_image->mtx); |
ead1f3e3 | 259 | if (((slave_image->address_attr & address) == address) && |
a17a75e2 MW |
260 | ((slave_image->cycle_attr & cycle) == cycle) && |
261 | (slave_image->locked == 0)) { | |
262 | ||
263 | slave_image->locked = 1; | |
886953e9 | 264 | mutex_unlock(&slave_image->mtx); |
a17a75e2 MW |
265 | allocated_image = slave_image; |
266 | break; | |
267 | } | |
886953e9 | 268 | mutex_unlock(&slave_image->mtx); |
a17a75e2 MW |
269 | } |
270 | ||
271 | /* No free image */ | |
272 | if (allocated_image == NULL) | |
273 | goto err_image; | |
274 | ||
275 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
276 | if (resource == NULL) { | |
277 | printk(KERN_WARNING "Unable to allocate resource structure\n"); | |
278 | goto err_alloc; | |
279 | } | |
280 | resource->type = VME_SLAVE; | |
886953e9 | 281 | resource->entry = &allocated_image->list; |
a17a75e2 MW |
282 | |
283 | return resource; | |
284 | ||
285 | err_alloc: | |
286 | /* Unlock image */ | |
886953e9 | 287 | mutex_lock(&slave_image->mtx); |
a17a75e2 | 288 | slave_image->locked = 0; |
886953e9 | 289 | mutex_unlock(&slave_image->mtx); |
a17a75e2 MW |
290 | err_image: |
291 | err_bus: | |
292 | return NULL; | |
293 | } | |
294 | EXPORT_SYMBOL(vme_slave_request); | |
295 | ||
ead1f3e3 | 296 | int vme_slave_set(struct vme_resource *resource, int enabled, |
a17a75e2 MW |
297 | unsigned long long vme_base, unsigned long long size, |
298 | dma_addr_t buf_base, vme_address_t aspace, vme_cycle_t cycle) | |
299 | { | |
300 | struct vme_bridge *bridge = find_bridge(resource); | |
301 | struct vme_slave_resource *image; | |
302 | int retval; | |
303 | ||
304 | if (resource->type != VME_SLAVE) { | |
ead1f3e3 | 305 | printk(KERN_ERR "Not a slave resource\n"); |
a17a75e2 MW |
306 | return -EINVAL; |
307 | } | |
308 | ||
309 | image = list_entry(resource->entry, struct vme_slave_resource, list); | |
310 | ||
311 | if (bridge->slave_set == NULL) { | |
ead1f3e3 | 312 | printk(KERN_ERR "Function not supported\n"); |
a17a75e2 MW |
313 | return -ENOSYS; |
314 | } | |
315 | ||
ead1f3e3 | 316 | if (!(((image->address_attr & aspace) == aspace) && |
a17a75e2 | 317 | ((image->cycle_attr & cycle) == cycle))) { |
ead1f3e3 | 318 | printk(KERN_ERR "Invalid attributes\n"); |
a17a75e2 MW |
319 | return -EINVAL; |
320 | } | |
321 | ||
322 | retval = vme_check_window(aspace, vme_base, size); | |
ead1f3e3 | 323 | if (retval) |
a17a75e2 MW |
324 | return retval; |
325 | ||
326 | return bridge->slave_set(image, enabled, vme_base, size, buf_base, | |
327 | aspace, cycle); | |
328 | } | |
329 | EXPORT_SYMBOL(vme_slave_set); | |
330 | ||
ead1f3e3 | 331 | int vme_slave_get(struct vme_resource *resource, int *enabled, |
a17a75e2 MW |
332 | unsigned long long *vme_base, unsigned long long *size, |
333 | dma_addr_t *buf_base, vme_address_t *aspace, vme_cycle_t *cycle) | |
334 | { | |
335 | struct vme_bridge *bridge = find_bridge(resource); | |
336 | struct vme_slave_resource *image; | |
337 | ||
338 | if (resource->type != VME_SLAVE) { | |
ead1f3e3 | 339 | printk(KERN_ERR "Not a slave resource\n"); |
a17a75e2 MW |
340 | return -EINVAL; |
341 | } | |
342 | ||
343 | image = list_entry(resource->entry, struct vme_slave_resource, list); | |
344 | ||
51a569f7 | 345 | if (bridge->slave_get == NULL) { |
ead1f3e3 | 346 | printk(KERN_ERR "vme_slave_get not supported\n"); |
a17a75e2 MW |
347 | return -EINVAL; |
348 | } | |
349 | ||
350 | return bridge->slave_get(image, enabled, vme_base, size, buf_base, | |
351 | aspace, cycle); | |
352 | } | |
353 | EXPORT_SYMBOL(vme_slave_get); | |
354 | ||
355 | void vme_slave_free(struct vme_resource *resource) | |
356 | { | |
357 | struct vme_slave_resource *slave_image; | |
358 | ||
359 | if (resource->type != VME_SLAVE) { | |
ead1f3e3 | 360 | printk(KERN_ERR "Not a slave resource\n"); |
a17a75e2 MW |
361 | return; |
362 | } | |
363 | ||
364 | slave_image = list_entry(resource->entry, struct vme_slave_resource, | |
365 | list); | |
366 | if (slave_image == NULL) { | |
ead1f3e3 | 367 | printk(KERN_ERR "Can't find slave resource\n"); |
a17a75e2 MW |
368 | return; |
369 | } | |
370 | ||
371 | /* Unlock image */ | |
886953e9 | 372 | mutex_lock(&slave_image->mtx); |
a17a75e2 MW |
373 | if (slave_image->locked == 0) |
374 | printk(KERN_ERR "Image is already free\n"); | |
375 | ||
376 | slave_image->locked = 0; | |
886953e9 | 377 | mutex_unlock(&slave_image->mtx); |
a17a75e2 MW |
378 | |
379 | /* Free up resource memory */ | |
380 | kfree(resource); | |
381 | } | |
382 | EXPORT_SYMBOL(vme_slave_free); | |
383 | ||
384 | /* | |
385 | * Request a master image with specific attributes, return some unique | |
386 | * identifier. | |
387 | */ | |
ead1f3e3 | 388 | struct vme_resource *vme_master_request(struct device *dev, |
a17a75e2 MW |
389 | vme_address_t address, vme_cycle_t cycle, vme_width_t dwidth) |
390 | { | |
391 | struct vme_bridge *bridge; | |
392 | struct list_head *master_pos = NULL; | |
393 | struct vme_master_resource *allocated_image = NULL; | |
394 | struct vme_master_resource *master_image = NULL; | |
395 | struct vme_resource *resource = NULL; | |
396 | ||
397 | bridge = dev_to_bridge(dev); | |
398 | if (bridge == NULL) { | |
399 | printk(KERN_ERR "Can't find VME bus\n"); | |
400 | goto err_bus; | |
401 | } | |
402 | ||
403 | /* Loop through master resources */ | |
886953e9 | 404 | list_for_each(master_pos, &bridge->master_resources) { |
a17a75e2 MW |
405 | master_image = list_entry(master_pos, |
406 | struct vme_master_resource, list); | |
407 | ||
408 | if (master_image == NULL) { | |
409 | printk(KERN_WARNING "Registered NULL master resource\n"); | |
410 | continue; | |
411 | } | |
412 | ||
413 | /* Find an unlocked and compatible image */ | |
886953e9 | 414 | spin_lock(&master_image->lock); |
ead1f3e3 | 415 | if (((master_image->address_attr & address) == address) && |
a17a75e2 MW |
416 | ((master_image->cycle_attr & cycle) == cycle) && |
417 | ((master_image->width_attr & dwidth) == dwidth) && | |
418 | (master_image->locked == 0)) { | |
419 | ||
420 | master_image->locked = 1; | |
886953e9 | 421 | spin_unlock(&master_image->lock); |
a17a75e2 MW |
422 | allocated_image = master_image; |
423 | break; | |
424 | } | |
886953e9 | 425 | spin_unlock(&master_image->lock); |
a17a75e2 MW |
426 | } |
427 | ||
428 | /* Check to see if we found a resource */ | |
429 | if (allocated_image == NULL) { | |
430 | printk(KERN_ERR "Can't find a suitable resource\n"); | |
431 | goto err_image; | |
432 | } | |
433 | ||
434 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
435 | if (resource == NULL) { | |
436 | printk(KERN_ERR "Unable to allocate resource structure\n"); | |
437 | goto err_alloc; | |
438 | } | |
439 | resource->type = VME_MASTER; | |
886953e9 | 440 | resource->entry = &allocated_image->list; |
a17a75e2 MW |
441 | |
442 | return resource; | |
443 | ||
a17a75e2 MW |
444 | err_alloc: |
445 | /* Unlock image */ | |
886953e9 | 446 | spin_lock(&master_image->lock); |
a17a75e2 | 447 | master_image->locked = 0; |
886953e9 | 448 | spin_unlock(&master_image->lock); |
a17a75e2 MW |
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 */ | |
886953e9 | 630 | spin_lock(&master_image->lock); |
a17a75e2 MW |
631 | if (master_image->locked == 0) |
632 | printk(KERN_ERR "Image is already free\n"); | |
633 | ||
634 | master_image->locked = 0; | |
886953e9 | 635 | spin_unlock(&master_image->lock); |
a17a75e2 MW |
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 | */ | |
4f723df4 | 646 | struct vme_resource *vme_dma_request(struct device *dev, vme_dma_route_t route) |
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 */ | |
886953e9 | 664 | list_for_each(dma_pos, &bridge->dma_resources) { |
a17a75e2 MW |
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 | ||
4f723df4 | 673 | /* Find an unlocked and compatible controller */ |
886953e9 | 674 | mutex_lock(&dma_ctrlr->mtx); |
4f723df4 MW |
675 | if (((dma_ctrlr->route_attr & route) == route) && |
676 | (dma_ctrlr->locked == 0)) { | |
677 | ||
a17a75e2 | 678 | dma_ctrlr->locked = 1; |
886953e9 | 679 | mutex_unlock(&dma_ctrlr->mtx); |
a17a75e2 MW |
680 | allocated_ctrlr = dma_ctrlr; |
681 | break; | |
682 | } | |
886953e9 | 683 | mutex_unlock(&dma_ctrlr->mtx); |
a17a75e2 MW |
684 | } |
685 | ||
686 | /* Check to see if we found a resource */ | |
687 | if (allocated_ctrlr == NULL) | |
688 | goto err_ctrlr; | |
689 | ||
690 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
691 | if (resource == NULL) { | |
692 | printk(KERN_WARNING "Unable to allocate resource structure\n"); | |
693 | goto err_alloc; | |
694 | } | |
695 | resource->type = VME_DMA; | |
886953e9 | 696 | resource->entry = &allocated_ctrlr->list; |
a17a75e2 MW |
697 | |
698 | return resource; | |
699 | ||
700 | err_alloc: | |
701 | /* Unlock image */ | |
886953e9 | 702 | mutex_lock(&dma_ctrlr->mtx); |
a17a75e2 | 703 | dma_ctrlr->locked = 0; |
886953e9 | 704 | mutex_unlock(&dma_ctrlr->mtx); |
a17a75e2 MW |
705 | err_ctrlr: |
706 | err_bus: | |
707 | return NULL; | |
708 | } | |
58e50798 | 709 | EXPORT_SYMBOL(vme_dma_request); |
a17a75e2 MW |
710 | |
711 | /* | |
712 | * Start new list | |
713 | */ | |
714 | struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource) | |
715 | { | |
716 | struct vme_dma_resource *ctrlr; | |
717 | struct vme_dma_list *dma_list; | |
718 | ||
719 | if (resource->type != VME_DMA) { | |
ead1f3e3 | 720 | printk(KERN_ERR "Not a DMA resource\n"); |
a17a75e2 MW |
721 | return NULL; |
722 | } | |
723 | ||
724 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); | |
725 | ||
ead1f3e3 MW |
726 | dma_list = kmalloc(sizeof(struct vme_dma_list), GFP_KERNEL); |
727 | if (dma_list == NULL) { | |
728 | printk(KERN_ERR "Unable to allocate memory for new dma list\n"); | |
a17a75e2 MW |
729 | return NULL; |
730 | } | |
886953e9 | 731 | INIT_LIST_HEAD(&dma_list->entries); |
a17a75e2 | 732 | dma_list->parent = ctrlr; |
886953e9 | 733 | mutex_init(&dma_list->mtx); |
a17a75e2 MW |
734 | |
735 | return dma_list; | |
736 | } | |
737 | EXPORT_SYMBOL(vme_new_dma_list); | |
738 | ||
739 | /* | |
740 | * Create "Pattern" type attributes | |
741 | */ | |
742 | struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, | |
743 | vme_pattern_t type) | |
744 | { | |
745 | struct vme_dma_attr *attributes; | |
746 | struct vme_dma_pattern *pattern_attr; | |
747 | ||
ead1f3e3 MW |
748 | attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL); |
749 | if (attributes == NULL) { | |
750 | printk(KERN_ERR "Unable to allocate memory for attributes " | |
751 | "structure\n"); | |
a17a75e2 MW |
752 | goto err_attr; |
753 | } | |
754 | ||
ead1f3e3 MW |
755 | pattern_attr = kmalloc(sizeof(struct vme_dma_pattern), GFP_KERNEL); |
756 | if (pattern_attr == NULL) { | |
757 | printk(KERN_ERR "Unable to allocate memory for pattern " | |
758 | "attributes\n"); | |
a17a75e2 MW |
759 | goto err_pat; |
760 | } | |
761 | ||
762 | attributes->type = VME_DMA_PATTERN; | |
763 | attributes->private = (void *)pattern_attr; | |
764 | ||
765 | pattern_attr->pattern = pattern; | |
766 | pattern_attr->type = type; | |
767 | ||
768 | return attributes; | |
769 | ||
a17a75e2 MW |
770 | err_pat: |
771 | kfree(attributes); | |
772 | err_attr: | |
773 | return NULL; | |
774 | } | |
775 | EXPORT_SYMBOL(vme_dma_pattern_attribute); | |
776 | ||
777 | /* | |
778 | * Create "PCI" type attributes | |
779 | */ | |
780 | struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address) | |
781 | { | |
782 | struct vme_dma_attr *attributes; | |
783 | struct vme_dma_pci *pci_attr; | |
784 | ||
785 | /* XXX Run some sanity checks here */ | |
786 | ||
ead1f3e3 MW |
787 | attributes = kmalloc(sizeof(struct vme_dma_attr), GFP_KERNEL); |
788 | if (attributes == NULL) { | |
789 | printk(KERN_ERR "Unable to allocate memory for attributes " | |
790 | "structure\n"); | |
a17a75e2 MW |
791 | goto err_attr; |
792 | } | |
793 | ||
ead1f3e3 MW |
794 | pci_attr = kmalloc(sizeof(struct vme_dma_pci), GFP_KERNEL); |
795 | if (pci_attr == NULL) { | |
796 | printk(KERN_ERR "Unable to allocate memory for pci " | |
797 | "attributes\n"); | |
a17a75e2 MW |
798 | goto err_pci; |
799 | } | |
800 | ||
801 | ||
802 | ||
803 | attributes->type = VME_DMA_PCI; | |
804 | attributes->private = (void *)pci_attr; | |
805 | ||
806 | pci_attr->address = address; | |
807 | ||
808 | return attributes; | |
809 | ||
a17a75e2 MW |
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 | ||
ead1f3e3 | 826 | attributes = kmalloc( |
a17a75e2 | 827 | sizeof(struct vme_dma_attr), GFP_KERNEL); |
ead1f3e3 MW |
828 | if (attributes == NULL) { |
829 | printk(KERN_ERR "Unable to allocate memory for attributes " | |
830 | "structure\n"); | |
a17a75e2 MW |
831 | goto err_attr; |
832 | } | |
833 | ||
ead1f3e3 MW |
834 | vme_attr = kmalloc(sizeof(struct vme_dma_vme), GFP_KERNEL); |
835 | if (vme_attr == NULL) { | |
836 | printk(KERN_ERR "Unable to allocate memory for vme " | |
837 | "attributes\n"); | |
a17a75e2 MW |
838 | goto err_vme; |
839 | } | |
840 | ||
841 | attributes->type = VME_DMA_VME; | |
842 | attributes->private = (void *)vme_attr; | |
843 | ||
844 | vme_attr->address = address; | |
845 | vme_attr->aspace = aspace; | |
846 | vme_attr->cycle = cycle; | |
847 | vme_attr->dwidth = dwidth; | |
848 | ||
849 | return attributes; | |
850 | ||
a17a75e2 MW |
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) { | |
ead1f3e3 | 875 | printk(KERN_WARNING "Link List DMA generation not supported\n"); |
a17a75e2 MW |
876 | return -EINVAL; |
877 | } | |
878 | ||
886953e9 | 879 | if (!mutex_trylock(&list->mtx)) { |
ead1f3e3 | 880 | printk(KERN_ERR "Link List already submitted\n"); |
a17a75e2 MW |
881 | return -EINVAL; |
882 | } | |
883 | ||
884 | retval = bridge->dma_list_add(list, src, dest, count); | |
885 | ||
886953e9 | 886 | mutex_unlock(&list->mtx); |
a17a75e2 MW |
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) { | |
ead1f3e3 | 898 | printk(KERN_ERR "Link List DMA execution not supported\n"); |
a17a75e2 MW |
899 | return -EINVAL; |
900 | } | |
901 | ||
886953e9 | 902 | mutex_lock(&list->mtx); |
a17a75e2 MW |
903 | |
904 | retval = bridge->dma_list_exec(list); | |
905 | ||
886953e9 | 906 | mutex_unlock(&list->mtx); |
a17a75e2 MW |
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) { | |
ead1f3e3 | 918 | printk(KERN_WARNING "Emptying of Link Lists not supported\n"); |
a17a75e2 MW |
919 | return -EINVAL; |
920 | } | |
921 | ||
886953e9 | 922 | if (!mutex_trylock(&list->mtx)) { |
ead1f3e3 | 923 | printk(KERN_ERR "Link List in use\n"); |
a17a75e2 MW |
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) { | |
ead1f3e3 | 933 | printk(KERN_ERR "Unable to empty link-list entries\n"); |
886953e9 | 934 | mutex_unlock(&list->mtx); |
a17a75e2 MW |
935 | return retval; |
936 | } | |
886953e9 | 937 | mutex_unlock(&list->mtx); |
a17a75e2 MW |
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) { | |
ead1f3e3 | 949 | printk(KERN_ERR "Not a DMA resource\n"); |
a17a75e2 MW |
950 | return -EINVAL; |
951 | } | |
952 | ||
953 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); | |
954 | ||
886953e9 | 955 | if (!mutex_trylock(&ctrlr->mtx)) { |
ead1f3e3 | 956 | printk(KERN_ERR "Resource busy, can't free\n"); |
a17a75e2 MW |
957 | return -EBUSY; |
958 | } | |
959 | ||
886953e9 | 960 | if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) { |
ead1f3e3 | 961 | printk(KERN_WARNING "Resource still processing transfers\n"); |
886953e9 | 962 | mutex_unlock(&ctrlr->mtx); |
a17a75e2 MW |
963 | return -EBUSY; |
964 | } | |
965 | ||
966 | ctrlr->locked = 0; | |
967 | ||
886953e9 | 968 | mutex_unlock(&ctrlr->mtx); |
a17a75e2 MW |
969 | |
970 | return 0; | |
971 | } | |
972 | EXPORT_SYMBOL(vme_dma_free); | |
973 | ||
c813f592 MW |
974 | void vme_irq_handler(struct vme_bridge *bridge, int level, int statid) |
975 | { | |
976 | void (*call)(int, int, void *); | |
977 | void *priv_data; | |
978 | ||
979 | call = bridge->irq[level - 1].callback[statid].func; | |
980 | priv_data = bridge->irq[level - 1].callback[statid].priv_data; | |
981 | ||
982 | if (call != NULL) | |
983 | call(level, statid, priv_data); | |
984 | else | |
985 | printk(KERN_WARNING "Spurilous VME interrupt, level:%x, " | |
986 | "vector:%x\n", level, statid); | |
987 | } | |
988 | EXPORT_SYMBOL(vme_irq_handler); | |
989 | ||
990 | int vme_irq_request(struct device *dev, int level, int statid, | |
29848ac9 | 991 | void (*callback)(int, int, void *), |
a17a75e2 MW |
992 | void *priv_data) |
993 | { | |
994 | struct vme_bridge *bridge; | |
995 | ||
996 | bridge = dev_to_bridge(dev); | |
997 | if (bridge == NULL) { | |
998 | printk(KERN_ERR "Can't find VME bus\n"); | |
999 | return -EINVAL; | |
1000 | } | |
1001 | ||
ead1f3e3 | 1002 | if ((level < 1) || (level > 7)) { |
c813f592 | 1003 | printk(KERN_ERR "Invalid interrupt level\n"); |
a17a75e2 MW |
1004 | return -EINVAL; |
1005 | } | |
1006 | ||
c813f592 MW |
1007 | if (bridge->irq_set == NULL) { |
1008 | printk(KERN_ERR "Configuring interrupts not supported\n"); | |
a17a75e2 MW |
1009 | return -EINVAL; |
1010 | } | |
1011 | ||
886953e9 | 1012 | mutex_lock(&bridge->irq_mtx); |
c813f592 MW |
1013 | |
1014 | if (bridge->irq[level - 1].callback[statid].func) { | |
886953e9 | 1015 | mutex_unlock(&bridge->irq_mtx); |
c813f592 MW |
1016 | printk(KERN_WARNING "VME Interrupt already taken\n"); |
1017 | return -EBUSY; | |
1018 | } | |
1019 | ||
1020 | bridge->irq[level - 1].count++; | |
1021 | bridge->irq[level - 1].callback[statid].priv_data = priv_data; | |
1022 | bridge->irq[level - 1].callback[statid].func = callback; | |
1023 | ||
1024 | /* Enable IRQ level */ | |
29848ac9 | 1025 | bridge->irq_set(bridge, level, 1, 1); |
c813f592 | 1026 | |
886953e9 | 1027 | mutex_unlock(&bridge->irq_mtx); |
c813f592 MW |
1028 | |
1029 | return 0; | |
a17a75e2 | 1030 | } |
c813f592 | 1031 | EXPORT_SYMBOL(vme_irq_request); |
a17a75e2 | 1032 | |
c813f592 | 1033 | void vme_irq_free(struct device *dev, int level, int statid) |
a17a75e2 MW |
1034 | { |
1035 | struct vme_bridge *bridge; | |
1036 | ||
1037 | bridge = dev_to_bridge(dev); | |
1038 | if (bridge == NULL) { | |
1039 | printk(KERN_ERR "Can't find VME bus\n"); | |
1040 | return; | |
1041 | } | |
1042 | ||
ead1f3e3 | 1043 | if ((level < 1) || (level > 7)) { |
c813f592 | 1044 | printk(KERN_ERR "Invalid interrupt level\n"); |
a17a75e2 MW |
1045 | return; |
1046 | } | |
1047 | ||
c813f592 MW |
1048 | if (bridge->irq_set == NULL) { |
1049 | printk(KERN_ERR "Configuring interrupts not supported\n"); | |
a17a75e2 MW |
1050 | return; |
1051 | } | |
1052 | ||
886953e9 | 1053 | mutex_lock(&bridge->irq_mtx); |
c813f592 MW |
1054 | |
1055 | bridge->irq[level - 1].count--; | |
1056 | ||
1057 | /* Disable IRQ level if no more interrupts attached at this level*/ | |
1058 | if (bridge->irq[level - 1].count == 0) | |
29848ac9 | 1059 | bridge->irq_set(bridge, level, 0, 1); |
c813f592 MW |
1060 | |
1061 | bridge->irq[level - 1].callback[statid].func = NULL; | |
1062 | bridge->irq[level - 1].callback[statid].priv_data = NULL; | |
1063 | ||
886953e9 | 1064 | mutex_unlock(&bridge->irq_mtx); |
a17a75e2 | 1065 | } |
c813f592 | 1066 | EXPORT_SYMBOL(vme_irq_free); |
a17a75e2 | 1067 | |
c813f592 | 1068 | int vme_irq_generate(struct device *dev, int level, int statid) |
a17a75e2 MW |
1069 | { |
1070 | struct vme_bridge *bridge; | |
1071 | ||
1072 | bridge = dev_to_bridge(dev); | |
1073 | if (bridge == NULL) { | |
1074 | printk(KERN_ERR "Can't find VME bus\n"); | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
ead1f3e3 | 1078 | if ((level < 1) || (level > 7)) { |
a17a75e2 MW |
1079 | printk(KERN_WARNING "Invalid interrupt level\n"); |
1080 | return -EINVAL; | |
1081 | } | |
1082 | ||
c813f592 | 1083 | if (bridge->irq_generate == NULL) { |
ead1f3e3 | 1084 | printk(KERN_WARNING "Interrupt generation not supported\n"); |
a17a75e2 MW |
1085 | return -EINVAL; |
1086 | } | |
1087 | ||
29848ac9 | 1088 | return bridge->irq_generate(bridge, level, statid); |
a17a75e2 | 1089 | } |
c813f592 | 1090 | EXPORT_SYMBOL(vme_irq_generate); |
a17a75e2 | 1091 | |
42fb5031 MW |
1092 | /* |
1093 | * Request the location monitor, return resource or NULL | |
1094 | */ | |
1095 | struct vme_resource *vme_lm_request(struct device *dev) | |
a17a75e2 MW |
1096 | { |
1097 | struct vme_bridge *bridge; | |
42fb5031 MW |
1098 | struct list_head *lm_pos = NULL; |
1099 | struct vme_lm_resource *allocated_lm = NULL; | |
1100 | struct vme_lm_resource *lm = NULL; | |
1101 | struct vme_resource *resource = NULL; | |
a17a75e2 MW |
1102 | |
1103 | bridge = dev_to_bridge(dev); | |
1104 | if (bridge == NULL) { | |
1105 | printk(KERN_ERR "Can't find VME bus\n"); | |
42fb5031 MW |
1106 | goto err_bus; |
1107 | } | |
1108 | ||
1109 | /* Loop through DMA resources */ | |
886953e9 | 1110 | list_for_each(lm_pos, &bridge->lm_resources) { |
42fb5031 MW |
1111 | lm = list_entry(lm_pos, |
1112 | struct vme_lm_resource, list); | |
1113 | ||
1114 | if (lm == NULL) { | |
1115 | printk(KERN_ERR "Registered NULL Location Monitor " | |
1116 | "resource\n"); | |
1117 | continue; | |
1118 | } | |
1119 | ||
1120 | /* Find an unlocked controller */ | |
886953e9 | 1121 | mutex_lock(&lm->mtx); |
42fb5031 MW |
1122 | if (lm->locked == 0) { |
1123 | lm->locked = 1; | |
886953e9 | 1124 | mutex_unlock(&lm->mtx); |
42fb5031 MW |
1125 | allocated_lm = lm; |
1126 | break; | |
1127 | } | |
886953e9 | 1128 | mutex_unlock(&lm->mtx); |
42fb5031 MW |
1129 | } |
1130 | ||
1131 | /* Check to see if we found a resource */ | |
1132 | if (allocated_lm == NULL) | |
1133 | goto err_lm; | |
1134 | ||
1135 | resource = kmalloc(sizeof(struct vme_resource), GFP_KERNEL); | |
1136 | if (resource == NULL) { | |
1137 | printk(KERN_ERR "Unable to allocate resource structure\n"); | |
1138 | goto err_alloc; | |
1139 | } | |
1140 | resource->type = VME_LM; | |
886953e9 | 1141 | resource->entry = &allocated_lm->list; |
42fb5031 MW |
1142 | |
1143 | return resource; | |
1144 | ||
1145 | err_alloc: | |
1146 | /* Unlock image */ | |
886953e9 | 1147 | mutex_lock(&lm->mtx); |
42fb5031 | 1148 | lm->locked = 0; |
886953e9 | 1149 | mutex_unlock(&lm->mtx); |
42fb5031 MW |
1150 | err_lm: |
1151 | err_bus: | |
1152 | return NULL; | |
1153 | } | |
1154 | EXPORT_SYMBOL(vme_lm_request); | |
1155 | ||
1156 | int vme_lm_count(struct vme_resource *resource) | |
1157 | { | |
1158 | struct vme_lm_resource *lm; | |
1159 | ||
1160 | if (resource->type != VME_LM) { | |
1161 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1162 | return -EINVAL; | |
1163 | } | |
1164 | ||
1165 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1166 | ||
1167 | return lm->monitors; | |
1168 | } | |
1169 | EXPORT_SYMBOL(vme_lm_count); | |
1170 | ||
1171 | int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base, | |
1172 | vme_address_t aspace, vme_cycle_t cycle) | |
1173 | { | |
1174 | struct vme_bridge *bridge = find_bridge(resource); | |
1175 | struct vme_lm_resource *lm; | |
1176 | ||
1177 | if (resource->type != VME_LM) { | |
1178 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1179 | return -EINVAL; |
1180 | } | |
1181 | ||
42fb5031 MW |
1182 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1183 | ||
a17a75e2 | 1184 | if (bridge->lm_set == NULL) { |
42fb5031 | 1185 | printk(KERN_ERR "vme_lm_set not supported\n"); |
a17a75e2 MW |
1186 | return -EINVAL; |
1187 | } | |
1188 | ||
8be9226c | 1189 | return bridge->lm_set(lm, lm_base, aspace, cycle); |
a17a75e2 MW |
1190 | } |
1191 | EXPORT_SYMBOL(vme_lm_set); | |
1192 | ||
42fb5031 MW |
1193 | int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base, |
1194 | vme_address_t *aspace, vme_cycle_t *cycle) | |
a17a75e2 | 1195 | { |
42fb5031 MW |
1196 | struct vme_bridge *bridge = find_bridge(resource); |
1197 | struct vme_lm_resource *lm; | |
a17a75e2 | 1198 | |
42fb5031 MW |
1199 | if (resource->type != VME_LM) { |
1200 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1201 | return -EINVAL; |
1202 | } | |
1203 | ||
42fb5031 MW |
1204 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1205 | ||
a17a75e2 | 1206 | if (bridge->lm_get == NULL) { |
42fb5031 | 1207 | printk(KERN_ERR "vme_lm_get not supported\n"); |
a17a75e2 MW |
1208 | return -EINVAL; |
1209 | } | |
1210 | ||
42fb5031 | 1211 | return bridge->lm_get(lm, lm_base, aspace, cycle); |
a17a75e2 MW |
1212 | } |
1213 | EXPORT_SYMBOL(vme_lm_get); | |
1214 | ||
42fb5031 MW |
1215 | int vme_lm_attach(struct vme_resource *resource, int monitor, |
1216 | void (*callback)(int)) | |
a17a75e2 | 1217 | { |
42fb5031 MW |
1218 | struct vme_bridge *bridge = find_bridge(resource); |
1219 | struct vme_lm_resource *lm; | |
a17a75e2 | 1220 | |
42fb5031 MW |
1221 | if (resource->type != VME_LM) { |
1222 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1223 | return -EINVAL; |
1224 | } | |
1225 | ||
42fb5031 MW |
1226 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1227 | ||
a17a75e2 | 1228 | if (bridge->lm_attach == NULL) { |
42fb5031 | 1229 | printk(KERN_ERR "vme_lm_attach not supported\n"); |
a17a75e2 MW |
1230 | return -EINVAL; |
1231 | } | |
1232 | ||
42fb5031 | 1233 | return bridge->lm_attach(lm, monitor, callback); |
a17a75e2 MW |
1234 | } |
1235 | EXPORT_SYMBOL(vme_lm_attach); | |
1236 | ||
42fb5031 | 1237 | int vme_lm_detach(struct vme_resource *resource, int monitor) |
a17a75e2 | 1238 | { |
42fb5031 MW |
1239 | struct vme_bridge *bridge = find_bridge(resource); |
1240 | struct vme_lm_resource *lm; | |
a17a75e2 | 1241 | |
42fb5031 MW |
1242 | if (resource->type != VME_LM) { |
1243 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
a17a75e2 MW |
1244 | return -EINVAL; |
1245 | } | |
1246 | ||
42fb5031 MW |
1247 | lm = list_entry(resource->entry, struct vme_lm_resource, list); |
1248 | ||
a17a75e2 | 1249 | if (bridge->lm_detach == NULL) { |
42fb5031 | 1250 | printk(KERN_ERR "vme_lm_detach not supported\n"); |
a17a75e2 MW |
1251 | return -EINVAL; |
1252 | } | |
1253 | ||
42fb5031 | 1254 | return bridge->lm_detach(lm, monitor); |
a17a75e2 MW |
1255 | } |
1256 | EXPORT_SYMBOL(vme_lm_detach); | |
1257 | ||
42fb5031 MW |
1258 | void vme_lm_free(struct vme_resource *resource) |
1259 | { | |
1260 | struct vme_lm_resource *lm; | |
1261 | ||
1262 | if (resource->type != VME_LM) { | |
1263 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1264 | return; | |
1265 | } | |
1266 | ||
1267 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1268 | ||
886953e9 | 1269 | mutex_lock(&lm->mtx); |
42fb5031 | 1270 | |
8be9226c MW |
1271 | /* XXX |
1272 | * Check to see that there aren't any callbacks still attached, if | |
1273 | * there are we should probably be detaching them! | |
1274 | */ | |
42fb5031 MW |
1275 | |
1276 | lm->locked = 0; | |
1277 | ||
886953e9 | 1278 | mutex_unlock(&lm->mtx); |
8be9226c MW |
1279 | |
1280 | kfree(resource); | |
42fb5031 MW |
1281 | } |
1282 | EXPORT_SYMBOL(vme_lm_free); | |
1283 | ||
a17a75e2 MW |
1284 | int vme_slot_get(struct device *bus) |
1285 | { | |
1286 | struct vme_bridge *bridge; | |
1287 | ||
1288 | bridge = dev_to_bridge(bus); | |
1289 | if (bridge == NULL) { | |
1290 | printk(KERN_ERR "Can't find VME bus\n"); | |
1291 | return -EINVAL; | |
1292 | } | |
1293 | ||
1294 | if (bridge->slot_get == NULL) { | |
ead1f3e3 | 1295 | printk(KERN_WARNING "vme_slot_get not supported\n"); |
a17a75e2 MW |
1296 | return -EINVAL; |
1297 | } | |
1298 | ||
29848ac9 | 1299 | return bridge->slot_get(bridge); |
a17a75e2 MW |
1300 | } |
1301 | EXPORT_SYMBOL(vme_slot_get); | |
1302 | ||
1303 | ||
1304 | /* - Bridge Registration --------------------------------------------------- */ | |
1305 | ||
1306 | static int vme_alloc_bus_num(void) | |
1307 | { | |
1308 | int i; | |
1309 | ||
400822fe | 1310 | mutex_lock(&vme_bus_num_mtx); |
a17a75e2 MW |
1311 | for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) { |
1312 | if (((vme_bus_numbers >> i) & 0x1) == 0) { | |
1313 | vme_bus_numbers |= (0x1 << i); | |
1314 | break; | |
1315 | } | |
1316 | } | |
400822fe | 1317 | mutex_unlock(&vme_bus_num_mtx); |
a17a75e2 MW |
1318 | |
1319 | return i; | |
1320 | } | |
1321 | ||
1322 | static void vme_free_bus_num(int bus) | |
1323 | { | |
400822fe | 1324 | mutex_lock(&vme_bus_num_mtx); |
db6d8fc5 | 1325 | vme_bus_numbers &= ~(0x1 << bus); |
400822fe | 1326 | mutex_unlock(&vme_bus_num_mtx); |
a17a75e2 MW |
1327 | } |
1328 | ||
ead1f3e3 | 1329 | int vme_register_bridge(struct vme_bridge *bridge) |
a17a75e2 MW |
1330 | { |
1331 | struct device *dev; | |
1332 | int retval; | |
1333 | int i; | |
1334 | ||
1335 | bridge->num = vme_alloc_bus_num(); | |
1336 | ||
1337 | /* This creates 32 vme "slot" devices. This equates to a slot for each | |
1338 | * ID available in a system conforming to the ANSI/VITA 1-1994 | |
1339 | * specification. | |
1340 | */ | |
1341 | for (i = 0; i < VME_SLOTS_MAX; i++) { | |
886953e9 | 1342 | dev = &bridge->dev[i]; |
a17a75e2 MW |
1343 | memset(dev, 0, sizeof(struct device)); |
1344 | ||
1345 | dev->parent = bridge->parent; | |
886953e9 | 1346 | dev->bus = &vme_bus_type; |
a17a75e2 MW |
1347 | /* |
1348 | * We save a pointer to the bridge in platform_data so that we | |
1349 | * can get to it later. We keep driver_data for use by the | |
1350 | * driver that binds against the slot | |
1351 | */ | |
1352 | dev->platform_data = bridge; | |
1353 | dev_set_name(dev, "vme-%x.%x", bridge->num, i + 1); | |
1354 | ||
1355 | retval = device_register(dev); | |
ead1f3e3 | 1356 | if (retval) |
a17a75e2 MW |
1357 | goto err_reg; |
1358 | } | |
1359 | ||
1360 | return retval; | |
1361 | ||
a17a75e2 | 1362 | err_reg: |
da1bbd1d | 1363 | while (--i >= 0) { |
886953e9 | 1364 | dev = &bridge->dev[i]; |
a17a75e2 MW |
1365 | device_unregister(dev); |
1366 | } | |
1367 | vme_free_bus_num(bridge->num); | |
1368 | return retval; | |
1369 | } | |
1370 | EXPORT_SYMBOL(vme_register_bridge); | |
1371 | ||
ead1f3e3 | 1372 | void vme_unregister_bridge(struct vme_bridge *bridge) |
a17a75e2 MW |
1373 | { |
1374 | int i; | |
1375 | struct device *dev; | |
1376 | ||
1377 | ||
1378 | for (i = 0; i < VME_SLOTS_MAX; i++) { | |
886953e9 | 1379 | dev = &bridge->dev[i]; |
a17a75e2 MW |
1380 | device_unregister(dev); |
1381 | } | |
1382 | vme_free_bus_num(bridge->num); | |
1383 | } | |
1384 | EXPORT_SYMBOL(vme_unregister_bridge); | |
1385 | ||
1386 | ||
1387 | /* - Driver Registration --------------------------------------------------- */ | |
1388 | ||
ead1f3e3 | 1389 | int vme_register_driver(struct vme_driver *drv) |
a17a75e2 MW |
1390 | { |
1391 | drv->driver.name = drv->name; | |
1392 | drv->driver.bus = &vme_bus_type; | |
1393 | ||
1394 | return driver_register(&drv->driver); | |
1395 | } | |
1396 | EXPORT_SYMBOL(vme_register_driver); | |
1397 | ||
ead1f3e3 | 1398 | void vme_unregister_driver(struct vme_driver *drv) |
a17a75e2 MW |
1399 | { |
1400 | driver_unregister(&drv->driver); | |
1401 | } | |
1402 | EXPORT_SYMBOL(vme_unregister_driver); | |
1403 | ||
1404 | /* - Bus Registration ------------------------------------------------------ */ | |
1405 | ||
b1a5fad4 | 1406 | static int vme_calc_slot(struct device *dev) |
a17a75e2 MW |
1407 | { |
1408 | struct vme_bridge *bridge; | |
1409 | int num; | |
1410 | ||
1411 | bridge = dev_to_bridge(dev); | |
1412 | ||
1413 | /* Determine slot number */ | |
1414 | num = 0; | |
ead1f3e3 | 1415 | while (num < VME_SLOTS_MAX) { |
886953e9 | 1416 | if (&bridge->dev[num] == dev) |
a17a75e2 | 1417 | break; |
ead1f3e3 | 1418 | |
a17a75e2 MW |
1419 | num++; |
1420 | } | |
1421 | if (num == VME_SLOTS_MAX) { | |
1422 | dev_err(dev, "Failed to identify slot\n"); | |
1423 | num = 0; | |
1424 | goto err_dev; | |
1425 | } | |
1426 | num++; | |
1427 | ||
1428 | err_dev: | |
1429 | return num; | |
1430 | } | |
1431 | ||
1432 | static struct vme_driver *dev_to_vme_driver(struct device *dev) | |
1433 | { | |
ead1f3e3 MW |
1434 | if (dev->driver == NULL) |
1435 | printk(KERN_ERR "Bugger dev->driver is NULL\n"); | |
a17a75e2 MW |
1436 | |
1437 | return container_of(dev->driver, struct vme_driver, driver); | |
1438 | } | |
1439 | ||
1440 | static int vme_bus_match(struct device *dev, struct device_driver *drv) | |
1441 | { | |
1442 | struct vme_bridge *bridge; | |
1443 | struct vme_driver *driver; | |
1444 | int i, num; | |
1445 | ||
1446 | bridge = dev_to_bridge(dev); | |
1447 | driver = container_of(drv, struct vme_driver, driver); | |
1448 | ||
1449 | num = vme_calc_slot(dev); | |
1450 | if (!num) | |
1451 | goto err_dev; | |
1452 | ||
1453 | if (driver->bind_table == NULL) { | |
1454 | dev_err(dev, "Bind table NULL\n"); | |
1455 | goto err_table; | |
1456 | } | |
1457 | ||
1458 | i = 0; | |
ead1f3e3 | 1459 | while ((driver->bind_table[i].bus != 0) || |
a17a75e2 MW |
1460 | (driver->bind_table[i].slot != 0)) { |
1461 | ||
a37b0dad MW |
1462 | if (bridge->num == driver->bind_table[i].bus) { |
1463 | if (num == driver->bind_table[i].slot) | |
1464 | return 1; | |
1465 | ||
1466 | if (driver->bind_table[i].slot == VME_SLOT_ALL) | |
1467 | return 1; | |
1468 | ||
1469 | if ((driver->bind_table[i].slot == VME_SLOT_CURRENT) && | |
1470 | (num == vme_slot_get(dev))) | |
1471 | return 1; | |
1472 | } | |
a17a75e2 MW |
1473 | i++; |
1474 | } | |
1475 | ||
1476 | err_dev: | |
1477 | err_table: | |
1478 | return 0; | |
1479 | } | |
1480 | ||
1481 | static int vme_bus_probe(struct device *dev) | |
1482 | { | |
1483 | struct vme_bridge *bridge; | |
1484 | struct vme_driver *driver; | |
1485 | int retval = -ENODEV; | |
1486 | ||
1487 | driver = dev_to_vme_driver(dev); | |
1488 | bridge = dev_to_bridge(dev); | |
1489 | ||
ead1f3e3 | 1490 | if (driver->probe != NULL) |
a17a75e2 | 1491 | retval = driver->probe(dev, bridge->num, vme_calc_slot(dev)); |
a17a75e2 MW |
1492 | |
1493 | return retval; | |
1494 | } | |
1495 | ||
1496 | static int vme_bus_remove(struct device *dev) | |
1497 | { | |
1498 | struct vme_bridge *bridge; | |
1499 | struct vme_driver *driver; | |
1500 | int retval = -ENODEV; | |
1501 | ||
1502 | driver = dev_to_vme_driver(dev); | |
1503 | bridge = dev_to_bridge(dev); | |
1504 | ||
ead1f3e3 | 1505 | if (driver->remove != NULL) |
a17a75e2 | 1506 | retval = driver->remove(dev, bridge->num, vme_calc_slot(dev)); |
a17a75e2 MW |
1507 | |
1508 | return retval; | |
1509 | } | |
1510 | ||
1511 | struct bus_type vme_bus_type = { | |
1512 | .name = "vme", | |
1513 | .match = vme_bus_match, | |
1514 | .probe = vme_bus_probe, | |
1515 | .remove = vme_bus_remove, | |
1516 | }; | |
1517 | EXPORT_SYMBOL(vme_bus_type); | |
1518 | ||
ead1f3e3 | 1519 | static int __init vme_init(void) |
a17a75e2 MW |
1520 | { |
1521 | return bus_register(&vme_bus_type); | |
1522 | } | |
1523 | ||
ead1f3e3 | 1524 | static void __exit vme_exit(void) |
a17a75e2 MW |
1525 | { |
1526 | bus_unregister(&vme_bus_type); | |
1527 | } | |
1528 | ||
1529 | MODULE_DESCRIPTION("VME bridge driver framework"); | |
66bd8db5 | 1530 | MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com"); |
a17a75e2 MW |
1531 | MODULE_LICENSE("GPL"); |
1532 | ||
1533 | module_init(vme_init); | |
1534 | module_exit(vme_exit); |