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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * VME Bridge Framework | |
4 | * | |
5 | * Author: Martyn Welch <martyn.welch@ge.com> | |
6 | * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc. | |
7 | * | |
8 | * Based on work by Tom Armistead and Ajit Prem | |
9 | * Copyright 2004 Motorola Inc. | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/export.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/errno.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/poll.h> | |
20 | #include <linux/highmem.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/device.h> | |
24 | #include <linux/dma-mapping.h> | |
25 | #include <linux/syscalls.h> | |
26 | #include <linux/mutex.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/vme.h> | |
30 | ||
31 | #include "vme_bridge.h" | |
32 | ||
33 | /* Bitmask and list of registered buses both protected by common mutex */ | |
34 | static unsigned int vme_bus_numbers; | |
35 | static LIST_HEAD(vme_bus_list); | |
36 | static DEFINE_MUTEX(vme_buses_lock); | |
37 | ||
38 | static int __init vme_init(void); | |
39 | ||
40 | static struct vme_dev *dev_to_vme_dev(struct device *dev) | |
41 | { | |
42 | return container_of(dev, struct vme_dev, dev); | |
43 | } | |
44 | ||
45 | /* | |
46 | * Find the bridge that the resource is associated with. | |
47 | */ | |
48 | static struct vme_bridge *find_bridge(struct vme_resource *resource) | |
49 | { | |
50 | /* Get list to search */ | |
51 | switch (resource->type) { | |
52 | case VME_MASTER: | |
53 | return list_entry(resource->entry, struct vme_master_resource, | |
54 | list)->parent; | |
55 | case VME_SLAVE: | |
56 | return list_entry(resource->entry, struct vme_slave_resource, | |
57 | list)->parent; | |
58 | case VME_DMA: | |
59 | return list_entry(resource->entry, struct vme_dma_resource, | |
60 | list)->parent; | |
61 | case VME_LM: | |
62 | return list_entry(resource->entry, struct vme_lm_resource, | |
63 | list)->parent; | |
64 | default: | |
65 | printk(KERN_ERR "Unknown resource type\n"); | |
66 | return NULL; | |
67 | } | |
68 | } | |
69 | ||
70 | /** | |
71 | * vme_alloc_consistent - Allocate contiguous memory. | |
72 | * @resource: Pointer to VME resource. | |
73 | * @size: Size of allocation required. | |
74 | * @dma: Pointer to variable to store physical address of allocation. | |
75 | * | |
76 | * Allocate a contiguous block of memory for use by the driver. This is used to | |
77 | * create the buffers for the slave windows. | |
78 | * | |
79 | * Return: Virtual address of allocation on success, NULL on failure. | |
80 | */ | |
81 | void *vme_alloc_consistent(struct vme_resource *resource, size_t size, | |
82 | dma_addr_t *dma) | |
83 | { | |
84 | struct vme_bridge *bridge; | |
85 | ||
86 | if (!resource) { | |
87 | printk(KERN_ERR "No resource\n"); | |
88 | return NULL; | |
89 | } | |
90 | ||
91 | bridge = find_bridge(resource); | |
92 | if (!bridge) { | |
93 | printk(KERN_ERR "Can't find bridge\n"); | |
94 | return NULL; | |
95 | } | |
96 | ||
97 | if (!bridge->parent) { | |
98 | printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name); | |
99 | return NULL; | |
100 | } | |
101 | ||
102 | if (!bridge->alloc_consistent) { | |
103 | printk(KERN_ERR "alloc_consistent not supported by bridge %s\n", | |
104 | bridge->name); | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | return bridge->alloc_consistent(bridge->parent, size, dma); | |
109 | } | |
110 | EXPORT_SYMBOL(vme_alloc_consistent); | |
111 | ||
112 | /** | |
113 | * vme_free_consistent - Free previously allocated memory. | |
114 | * @resource: Pointer to VME resource. | |
115 | * @size: Size of allocation to free. | |
116 | * @vaddr: Virtual address of allocation. | |
117 | * @dma: Physical address of allocation. | |
118 | * | |
119 | * Free previously allocated block of contiguous memory. | |
120 | */ | |
121 | void vme_free_consistent(struct vme_resource *resource, size_t size, | |
122 | void *vaddr, dma_addr_t dma) | |
123 | { | |
124 | struct vme_bridge *bridge; | |
125 | ||
126 | if (!resource) { | |
127 | printk(KERN_ERR "No resource\n"); | |
128 | return; | |
129 | } | |
130 | ||
131 | bridge = find_bridge(resource); | |
132 | if (!bridge) { | |
133 | printk(KERN_ERR "Can't find bridge\n"); | |
134 | return; | |
135 | } | |
136 | ||
137 | if (!bridge->parent) { | |
138 | printk(KERN_ERR "Dev entry NULL for bridge %s\n", bridge->name); | |
139 | return; | |
140 | } | |
141 | ||
142 | if (!bridge->free_consistent) { | |
143 | printk(KERN_ERR "free_consistent not supported by bridge %s\n", | |
144 | bridge->name); | |
145 | return; | |
146 | } | |
147 | ||
148 | bridge->free_consistent(bridge->parent, size, vaddr, dma); | |
149 | } | |
150 | EXPORT_SYMBOL(vme_free_consistent); | |
151 | ||
152 | /** | |
153 | * vme_get_size - Helper function returning size of a VME window | |
154 | * @resource: Pointer to VME slave or master resource. | |
155 | * | |
156 | * Determine the size of the VME window provided. This is a helper | |
157 | * function, wrappering the call to vme_master_get or vme_slave_get | |
158 | * depending on the type of window resource handed to it. | |
159 | * | |
160 | * Return: Size of the window on success, zero on failure. | |
161 | */ | |
162 | size_t vme_get_size(struct vme_resource *resource) | |
163 | { | |
164 | int enabled, retval; | |
165 | unsigned long long base, size; | |
166 | dma_addr_t buf_base; | |
167 | u32 aspace, cycle, dwidth; | |
168 | ||
169 | switch (resource->type) { | |
170 | case VME_MASTER: | |
171 | retval = vme_master_get(resource, &enabled, &base, &size, | |
172 | &aspace, &cycle, &dwidth); | |
173 | if (retval) | |
174 | return 0; | |
175 | ||
176 | return size; | |
177 | case VME_SLAVE: | |
178 | retval = vme_slave_get(resource, &enabled, &base, &size, | |
179 | &buf_base, &aspace, &cycle); | |
180 | if (retval) | |
181 | return 0; | |
182 | ||
183 | return size; | |
184 | case VME_DMA: | |
185 | return 0; | |
186 | default: | |
187 | printk(KERN_ERR "Unknown resource type\n"); | |
188 | return 0; | |
189 | } | |
190 | } | |
191 | EXPORT_SYMBOL(vme_get_size); | |
192 | ||
193 | int vme_check_window(u32 aspace, unsigned long long vme_base, | |
194 | unsigned long long size) | |
195 | { | |
196 | int retval = 0; | |
197 | ||
198 | if (vme_base + size < size) | |
199 | return -EINVAL; | |
200 | ||
201 | switch (aspace) { | |
202 | case VME_A16: | |
203 | if (vme_base + size > VME_A16_MAX) | |
204 | retval = -EFAULT; | |
205 | break; | |
206 | case VME_A24: | |
207 | if (vme_base + size > VME_A24_MAX) | |
208 | retval = -EFAULT; | |
209 | break; | |
210 | case VME_A32: | |
211 | if (vme_base + size > VME_A32_MAX) | |
212 | retval = -EFAULT; | |
213 | break; | |
214 | case VME_A64: | |
215 | /* The VME_A64_MAX limit is actually U64_MAX + 1 */ | |
216 | break; | |
217 | case VME_CRCSR: | |
218 | if (vme_base + size > VME_CRCSR_MAX) | |
219 | retval = -EFAULT; | |
220 | break; | |
221 | case VME_USER1: | |
222 | case VME_USER2: | |
223 | case VME_USER3: | |
224 | case VME_USER4: | |
225 | /* User Defined */ | |
226 | break; | |
227 | default: | |
228 | printk(KERN_ERR "Invalid address space\n"); | |
229 | retval = -EINVAL; | |
230 | break; | |
231 | } | |
232 | ||
233 | return retval; | |
234 | } | |
235 | EXPORT_SYMBOL(vme_check_window); | |
236 | ||
237 | static u32 vme_get_aspace(int am) | |
238 | { | |
239 | switch (am) { | |
240 | case 0x29: | |
241 | case 0x2D: | |
242 | return VME_A16; | |
243 | case 0x38: | |
244 | case 0x39: | |
245 | case 0x3A: | |
246 | case 0x3B: | |
247 | case 0x3C: | |
248 | case 0x3D: | |
249 | case 0x3E: | |
250 | case 0x3F: | |
251 | return VME_A24; | |
252 | case 0x8: | |
253 | case 0x9: | |
254 | case 0xA: | |
255 | case 0xB: | |
256 | case 0xC: | |
257 | case 0xD: | |
258 | case 0xE: | |
259 | case 0xF: | |
260 | return VME_A32; | |
261 | case 0x0: | |
262 | case 0x1: | |
263 | case 0x3: | |
264 | return VME_A64; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | /** | |
271 | * vme_slave_request - Request a VME slave window resource. | |
272 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
273 | * @address: Required VME address space. | |
274 | * @cycle: Required VME data transfer cycle type. | |
275 | * | |
276 | * Request use of a VME window resource capable of being set for the requested | |
277 | * address space and data transfer cycle. | |
278 | * | |
279 | * Return: Pointer to VME resource on success, NULL on failure. | |
280 | */ | |
281 | struct vme_resource *vme_slave_request(struct vme_dev *vdev, u32 address, | |
282 | u32 cycle) | |
283 | { | |
284 | struct vme_bridge *bridge; | |
285 | struct list_head *slave_pos = NULL; | |
286 | struct vme_slave_resource *allocated_image = NULL; | |
287 | struct vme_slave_resource *slave_image = NULL; | |
288 | struct vme_resource *resource = NULL; | |
289 | ||
290 | bridge = vdev->bridge; | |
291 | if (!bridge) { | |
292 | printk(KERN_ERR "Can't find VME bus\n"); | |
293 | goto err_bus; | |
294 | } | |
295 | ||
296 | /* Loop through slave resources */ | |
297 | list_for_each(slave_pos, &bridge->slave_resources) { | |
298 | slave_image = list_entry(slave_pos, | |
299 | struct vme_slave_resource, list); | |
300 | ||
301 | if (!slave_image) { | |
302 | printk(KERN_ERR "Registered NULL Slave resource\n"); | |
303 | continue; | |
304 | } | |
305 | ||
306 | /* Find an unlocked and compatible image */ | |
307 | mutex_lock(&slave_image->mtx); | |
308 | if (((slave_image->address_attr & address) == address) && | |
309 | ((slave_image->cycle_attr & cycle) == cycle) && | |
310 | (slave_image->locked == 0)) { | |
311 | ||
312 | slave_image->locked = 1; | |
313 | mutex_unlock(&slave_image->mtx); | |
314 | allocated_image = slave_image; | |
315 | break; | |
316 | } | |
317 | mutex_unlock(&slave_image->mtx); | |
318 | } | |
319 | ||
320 | /* No free image */ | |
321 | if (!allocated_image) | |
322 | goto err_image; | |
323 | ||
324 | resource = kmalloc(sizeof(*resource), GFP_KERNEL); | |
325 | if (!resource) | |
326 | goto err_alloc; | |
327 | ||
328 | resource->type = VME_SLAVE; | |
329 | resource->entry = &allocated_image->list; | |
330 | ||
331 | return resource; | |
332 | ||
333 | err_alloc: | |
334 | /* Unlock image */ | |
335 | mutex_lock(&slave_image->mtx); | |
336 | slave_image->locked = 0; | |
337 | mutex_unlock(&slave_image->mtx); | |
338 | err_image: | |
339 | err_bus: | |
340 | return NULL; | |
341 | } | |
342 | EXPORT_SYMBOL(vme_slave_request); | |
343 | ||
344 | /** | |
345 | * vme_slave_set - Set VME slave window configuration. | |
346 | * @resource: Pointer to VME slave resource. | |
347 | * @enabled: State to which the window should be configured. | |
348 | * @vme_base: Base address for the window. | |
349 | * @size: Size of the VME window. | |
350 | * @buf_base: Based address of buffer used to provide VME slave window storage. | |
351 | * @aspace: VME address space for the VME window. | |
352 | * @cycle: VME data transfer cycle type for the VME window. | |
353 | * | |
354 | * Set configuration for provided VME slave window. | |
355 | * | |
356 | * Return: Zero on success, -EINVAL if operation is not supported on this | |
357 | * device, if an invalid resource has been provided or invalid | |
358 | * attributes are provided. Hardware specific errors may also be | |
359 | * returned. | |
360 | */ | |
361 | int vme_slave_set(struct vme_resource *resource, int enabled, | |
362 | unsigned long long vme_base, unsigned long long size, | |
363 | dma_addr_t buf_base, u32 aspace, u32 cycle) | |
364 | { | |
365 | struct vme_bridge *bridge = find_bridge(resource); | |
366 | struct vme_slave_resource *image; | |
367 | int retval; | |
368 | ||
369 | if (resource->type != VME_SLAVE) { | |
370 | printk(KERN_ERR "Not a slave resource\n"); | |
371 | return -EINVAL; | |
372 | } | |
373 | ||
374 | image = list_entry(resource->entry, struct vme_slave_resource, list); | |
375 | ||
376 | if (!bridge->slave_set) { | |
377 | printk(KERN_ERR "Function not supported\n"); | |
378 | return -ENOSYS; | |
379 | } | |
380 | ||
381 | if (!(((image->address_attr & aspace) == aspace) && | |
382 | ((image->cycle_attr & cycle) == cycle))) { | |
383 | printk(KERN_ERR "Invalid attributes\n"); | |
384 | return -EINVAL; | |
385 | } | |
386 | ||
387 | retval = vme_check_window(aspace, vme_base, size); | |
388 | if (retval) | |
389 | return retval; | |
390 | ||
391 | return bridge->slave_set(image, enabled, vme_base, size, buf_base, | |
392 | aspace, cycle); | |
393 | } | |
394 | EXPORT_SYMBOL(vme_slave_set); | |
395 | ||
396 | /** | |
397 | * vme_slave_get - Retrieve VME slave window configuration. | |
398 | * @resource: Pointer to VME slave resource. | |
399 | * @enabled: Pointer to variable for storing state. | |
400 | * @vme_base: Pointer to variable for storing window base address. | |
401 | * @size: Pointer to variable for storing window size. | |
402 | * @buf_base: Pointer to variable for storing slave buffer base address. | |
403 | * @aspace: Pointer to variable for storing VME address space. | |
404 | * @cycle: Pointer to variable for storing VME data transfer cycle type. | |
405 | * | |
406 | * Return configuration for provided VME slave window. | |
407 | * | |
408 | * Return: Zero on success, -EINVAL if operation is not supported on this | |
409 | * device or if an invalid resource has been provided. | |
410 | */ | |
411 | int vme_slave_get(struct vme_resource *resource, int *enabled, | |
412 | unsigned long long *vme_base, unsigned long long *size, | |
413 | dma_addr_t *buf_base, u32 *aspace, u32 *cycle) | |
414 | { | |
415 | struct vme_bridge *bridge = find_bridge(resource); | |
416 | struct vme_slave_resource *image; | |
417 | ||
418 | if (resource->type != VME_SLAVE) { | |
419 | printk(KERN_ERR "Not a slave resource\n"); | |
420 | return -EINVAL; | |
421 | } | |
422 | ||
423 | image = list_entry(resource->entry, struct vme_slave_resource, list); | |
424 | ||
425 | if (!bridge->slave_get) { | |
426 | printk(KERN_ERR "vme_slave_get not supported\n"); | |
427 | return -EINVAL; | |
428 | } | |
429 | ||
430 | return bridge->slave_get(image, enabled, vme_base, size, buf_base, | |
431 | aspace, cycle); | |
432 | } | |
433 | EXPORT_SYMBOL(vme_slave_get); | |
434 | ||
435 | /** | |
436 | * vme_slave_free - Free VME slave window | |
437 | * @resource: Pointer to VME slave resource. | |
438 | * | |
439 | * Free the provided slave resource so that it may be reallocated. | |
440 | */ | |
441 | void vme_slave_free(struct vme_resource *resource) | |
442 | { | |
443 | struct vme_slave_resource *slave_image; | |
444 | ||
445 | if (resource->type != VME_SLAVE) { | |
446 | printk(KERN_ERR "Not a slave resource\n"); | |
447 | return; | |
448 | } | |
449 | ||
450 | slave_image = list_entry(resource->entry, struct vme_slave_resource, | |
451 | list); | |
452 | if (!slave_image) { | |
453 | printk(KERN_ERR "Can't find slave resource\n"); | |
454 | return; | |
455 | } | |
456 | ||
457 | /* Unlock image */ | |
458 | mutex_lock(&slave_image->mtx); | |
459 | if (slave_image->locked == 0) | |
460 | printk(KERN_ERR "Image is already free\n"); | |
461 | ||
462 | slave_image->locked = 0; | |
463 | mutex_unlock(&slave_image->mtx); | |
464 | ||
465 | /* Free up resource memory */ | |
466 | kfree(resource); | |
467 | } | |
468 | EXPORT_SYMBOL(vme_slave_free); | |
469 | ||
470 | /** | |
471 | * vme_master_request - Request a VME master window resource. | |
472 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
473 | * @address: Required VME address space. | |
474 | * @cycle: Required VME data transfer cycle type. | |
475 | * @dwidth: Required VME data transfer width. | |
476 | * | |
477 | * Request use of a VME window resource capable of being set for the requested | |
478 | * address space, data transfer cycle and width. | |
479 | * | |
480 | * Return: Pointer to VME resource on success, NULL on failure. | |
481 | */ | |
482 | struct vme_resource *vme_master_request(struct vme_dev *vdev, u32 address, | |
483 | u32 cycle, u32 dwidth) | |
484 | { | |
485 | struct vme_bridge *bridge; | |
486 | struct list_head *master_pos = NULL; | |
487 | struct vme_master_resource *allocated_image = NULL; | |
488 | struct vme_master_resource *master_image = NULL; | |
489 | struct vme_resource *resource = NULL; | |
490 | ||
491 | bridge = vdev->bridge; | |
492 | if (!bridge) { | |
493 | printk(KERN_ERR "Can't find VME bus\n"); | |
494 | goto err_bus; | |
495 | } | |
496 | ||
497 | /* Loop through master resources */ | |
498 | list_for_each(master_pos, &bridge->master_resources) { | |
499 | master_image = list_entry(master_pos, | |
500 | struct vme_master_resource, list); | |
501 | ||
502 | if (!master_image) { | |
503 | printk(KERN_WARNING "Registered NULL master resource\n"); | |
504 | continue; | |
505 | } | |
506 | ||
507 | /* Find an unlocked and compatible image */ | |
508 | spin_lock(&master_image->lock); | |
509 | if (((master_image->address_attr & address) == address) && | |
510 | ((master_image->cycle_attr & cycle) == cycle) && | |
511 | ((master_image->width_attr & dwidth) == dwidth) && | |
512 | (master_image->locked == 0)) { | |
513 | ||
514 | master_image->locked = 1; | |
515 | spin_unlock(&master_image->lock); | |
516 | allocated_image = master_image; | |
517 | break; | |
518 | } | |
519 | spin_unlock(&master_image->lock); | |
520 | } | |
521 | ||
522 | /* Check to see if we found a resource */ | |
523 | if (!allocated_image) { | |
524 | printk(KERN_ERR "Can't find a suitable resource\n"); | |
525 | goto err_image; | |
526 | } | |
527 | ||
528 | resource = kmalloc(sizeof(*resource), GFP_KERNEL); | |
529 | if (!resource) | |
530 | goto err_alloc; | |
531 | ||
532 | resource->type = VME_MASTER; | |
533 | resource->entry = &allocated_image->list; | |
534 | ||
535 | return resource; | |
536 | ||
537 | err_alloc: | |
538 | /* Unlock image */ | |
539 | spin_lock(&master_image->lock); | |
540 | master_image->locked = 0; | |
541 | spin_unlock(&master_image->lock); | |
542 | err_image: | |
543 | err_bus: | |
544 | return NULL; | |
545 | } | |
546 | EXPORT_SYMBOL(vme_master_request); | |
547 | ||
548 | /** | |
549 | * vme_master_set - Set VME master window configuration. | |
550 | * @resource: Pointer to VME master resource. | |
551 | * @enabled: State to which the window should be configured. | |
552 | * @vme_base: Base address for the window. | |
553 | * @size: Size of the VME window. | |
554 | * @aspace: VME address space for the VME window. | |
555 | * @cycle: VME data transfer cycle type for the VME window. | |
556 | * @dwidth: VME data transfer width for the VME window. | |
557 | * | |
558 | * Set configuration for provided VME master window. | |
559 | * | |
560 | * Return: Zero on success, -EINVAL if operation is not supported on this | |
561 | * device, if an invalid resource has been provided or invalid | |
562 | * attributes are provided. Hardware specific errors may also be | |
563 | * returned. | |
564 | */ | |
565 | int vme_master_set(struct vme_resource *resource, int enabled, | |
566 | unsigned long long vme_base, unsigned long long size, u32 aspace, | |
567 | u32 cycle, u32 dwidth) | |
568 | { | |
569 | struct vme_bridge *bridge = find_bridge(resource); | |
570 | struct vme_master_resource *image; | |
571 | int retval; | |
572 | ||
573 | if (resource->type != VME_MASTER) { | |
574 | printk(KERN_ERR "Not a master resource\n"); | |
575 | return -EINVAL; | |
576 | } | |
577 | ||
578 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
579 | ||
580 | if (!bridge->master_set) { | |
581 | printk(KERN_WARNING "vme_master_set not supported\n"); | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | if (!(((image->address_attr & aspace) == aspace) && | |
586 | ((image->cycle_attr & cycle) == cycle) && | |
587 | ((image->width_attr & dwidth) == dwidth))) { | |
588 | printk(KERN_WARNING "Invalid attributes\n"); | |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | retval = vme_check_window(aspace, vme_base, size); | |
593 | if (retval) | |
594 | return retval; | |
595 | ||
596 | return bridge->master_set(image, enabled, vme_base, size, aspace, | |
597 | cycle, dwidth); | |
598 | } | |
599 | EXPORT_SYMBOL(vme_master_set); | |
600 | ||
601 | /** | |
602 | * vme_master_get - Retrieve VME master window configuration. | |
603 | * @resource: Pointer to VME master resource. | |
604 | * @enabled: Pointer to variable for storing state. | |
605 | * @vme_base: Pointer to variable for storing window base address. | |
606 | * @size: Pointer to variable for storing window size. | |
607 | * @aspace: Pointer to variable for storing VME address space. | |
608 | * @cycle: Pointer to variable for storing VME data transfer cycle type. | |
609 | * @dwidth: Pointer to variable for storing VME data transfer width. | |
610 | * | |
611 | * Return configuration for provided VME master window. | |
612 | * | |
613 | * Return: Zero on success, -EINVAL if operation is not supported on this | |
614 | * device or if an invalid resource has been provided. | |
615 | */ | |
616 | int vme_master_get(struct vme_resource *resource, int *enabled, | |
617 | unsigned long long *vme_base, unsigned long long *size, u32 *aspace, | |
618 | u32 *cycle, u32 *dwidth) | |
619 | { | |
620 | struct vme_bridge *bridge = find_bridge(resource); | |
621 | struct vme_master_resource *image; | |
622 | ||
623 | if (resource->type != VME_MASTER) { | |
624 | printk(KERN_ERR "Not a master resource\n"); | |
625 | return -EINVAL; | |
626 | } | |
627 | ||
628 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
629 | ||
630 | if (!bridge->master_get) { | |
631 | printk(KERN_WARNING "%s not supported\n", __func__); | |
632 | return -EINVAL; | |
633 | } | |
634 | ||
635 | return bridge->master_get(image, enabled, vme_base, size, aspace, | |
636 | cycle, dwidth); | |
637 | } | |
638 | EXPORT_SYMBOL(vme_master_get); | |
639 | ||
640 | /** | |
641 | * vme_master_read - Read data from VME space into a buffer. | |
642 | * @resource: Pointer to VME master resource. | |
643 | * @buf: Pointer to buffer where data should be transferred. | |
644 | * @count: Number of bytes to transfer. | |
645 | * @offset: Offset into VME master window at which to start transfer. | |
646 | * | |
647 | * Perform read of count bytes of data from location on VME bus which maps into | |
648 | * the VME master window at offset to buf. | |
649 | * | |
650 | * Return: Number of bytes read, -EINVAL if resource is not a VME master | |
651 | * resource or read operation is not supported. -EFAULT returned if | |
652 | * invalid offset is provided. Hardware specific errors may also be | |
653 | * returned. | |
654 | */ | |
655 | ssize_t vme_master_read(struct vme_resource *resource, void *buf, size_t count, | |
656 | loff_t offset) | |
657 | { | |
658 | struct vme_bridge *bridge = find_bridge(resource); | |
659 | struct vme_master_resource *image; | |
660 | size_t length; | |
661 | ||
662 | if (!bridge->master_read) { | |
663 | printk(KERN_WARNING "Reading from resource not supported\n"); | |
664 | return -EINVAL; | |
665 | } | |
666 | ||
667 | if (resource->type != VME_MASTER) { | |
668 | printk(KERN_ERR "Not a master resource\n"); | |
669 | return -EINVAL; | |
670 | } | |
671 | ||
672 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
673 | ||
674 | length = vme_get_size(resource); | |
675 | ||
676 | if (offset > length) { | |
677 | printk(KERN_WARNING "Invalid Offset\n"); | |
678 | return -EFAULT; | |
679 | } | |
680 | ||
681 | if ((offset + count) > length) | |
682 | count = length - offset; | |
683 | ||
684 | return bridge->master_read(image, buf, count, offset); | |
685 | ||
686 | } | |
687 | EXPORT_SYMBOL(vme_master_read); | |
688 | ||
689 | /** | |
690 | * vme_master_write - Write data out to VME space from a buffer. | |
691 | * @resource: Pointer to VME master resource. | |
692 | * @buf: Pointer to buffer holding data to transfer. | |
693 | * @count: Number of bytes to transfer. | |
694 | * @offset: Offset into VME master window at which to start transfer. | |
695 | * | |
696 | * Perform write of count bytes of data from buf to location on VME bus which | |
697 | * maps into the VME master window at offset. | |
698 | * | |
699 | * Return: Number of bytes written, -EINVAL if resource is not a VME master | |
700 | * resource or write operation is not supported. -EFAULT returned if | |
701 | * invalid offset is provided. Hardware specific errors may also be | |
702 | * returned. | |
703 | */ | |
704 | ssize_t vme_master_write(struct vme_resource *resource, void *buf, | |
705 | size_t count, loff_t offset) | |
706 | { | |
707 | struct vme_bridge *bridge = find_bridge(resource); | |
708 | struct vme_master_resource *image; | |
709 | size_t length; | |
710 | ||
711 | if (!bridge->master_write) { | |
712 | printk(KERN_WARNING "Writing to resource not supported\n"); | |
713 | return -EINVAL; | |
714 | } | |
715 | ||
716 | if (resource->type != VME_MASTER) { | |
717 | printk(KERN_ERR "Not a master resource\n"); | |
718 | return -EINVAL; | |
719 | } | |
720 | ||
721 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
722 | ||
723 | length = vme_get_size(resource); | |
724 | ||
725 | if (offset > length) { | |
726 | printk(KERN_WARNING "Invalid Offset\n"); | |
727 | return -EFAULT; | |
728 | } | |
729 | ||
730 | if ((offset + count) > length) | |
731 | count = length - offset; | |
732 | ||
733 | return bridge->master_write(image, buf, count, offset); | |
734 | } | |
735 | EXPORT_SYMBOL(vme_master_write); | |
736 | ||
737 | /** | |
738 | * vme_master_rmw - Perform read-modify-write cycle. | |
739 | * @resource: Pointer to VME master resource. | |
740 | * @mask: Bits to be compared and swapped in operation. | |
741 | * @compare: Bits to be compared with data read from offset. | |
742 | * @swap: Bits to be swapped in data read from offset. | |
743 | * @offset: Offset into VME master window at which to perform operation. | |
744 | * | |
745 | * Perform read-modify-write cycle on provided location: | |
746 | * - Location on VME bus is read. | |
747 | * - Bits selected by mask are compared with compare. | |
748 | * - Where a selected bit matches that in compare and are selected in swap, | |
749 | * the bit is swapped. | |
750 | * - Result written back to location on VME bus. | |
751 | * | |
752 | * Return: Bytes written on success, -EINVAL if resource is not a VME master | |
753 | * resource or RMW operation is not supported. Hardware specific | |
754 | * errors may also be returned. | |
755 | */ | |
756 | unsigned int vme_master_rmw(struct vme_resource *resource, unsigned int mask, | |
757 | unsigned int compare, unsigned int swap, loff_t offset) | |
758 | { | |
759 | struct vme_bridge *bridge = find_bridge(resource); | |
760 | struct vme_master_resource *image; | |
761 | ||
762 | if (!bridge->master_rmw) { | |
763 | printk(KERN_WARNING "Writing to resource not supported\n"); | |
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | if (resource->type != VME_MASTER) { | |
768 | printk(KERN_ERR "Not a master resource\n"); | |
769 | return -EINVAL; | |
770 | } | |
771 | ||
772 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
773 | ||
774 | return bridge->master_rmw(image, mask, compare, swap, offset); | |
775 | } | |
776 | EXPORT_SYMBOL(vme_master_rmw); | |
777 | ||
778 | /** | |
779 | * vme_master_mmap - Mmap region of VME master window. | |
780 | * @resource: Pointer to VME master resource. | |
781 | * @vma: Pointer to definition of user mapping. | |
782 | * | |
783 | * Memory map a region of the VME master window into user space. | |
784 | * | |
785 | * Return: Zero on success, -EINVAL if resource is not a VME master | |
786 | * resource or -EFAULT if map exceeds window size. Other generic mmap | |
787 | * errors may also be returned. | |
788 | */ | |
789 | int vme_master_mmap(struct vme_resource *resource, struct vm_area_struct *vma) | |
790 | { | |
791 | struct vme_master_resource *image; | |
792 | phys_addr_t phys_addr; | |
793 | unsigned long vma_size; | |
794 | ||
795 | if (resource->type != VME_MASTER) { | |
796 | pr_err("Not a master resource\n"); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | image = list_entry(resource->entry, struct vme_master_resource, list); | |
801 | phys_addr = image->bus_resource.start + (vma->vm_pgoff << PAGE_SHIFT); | |
802 | vma_size = vma->vm_end - vma->vm_start; | |
803 | ||
804 | if (phys_addr + vma_size > image->bus_resource.end + 1) { | |
805 | pr_err("Map size cannot exceed the window size\n"); | |
806 | return -EFAULT; | |
807 | } | |
808 | ||
809 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
810 | ||
811 | return vm_iomap_memory(vma, phys_addr, vma->vm_end - vma->vm_start); | |
812 | } | |
813 | EXPORT_SYMBOL(vme_master_mmap); | |
814 | ||
815 | /** | |
816 | * vme_master_free - Free VME master window | |
817 | * @resource: Pointer to VME master resource. | |
818 | * | |
819 | * Free the provided master resource so that it may be reallocated. | |
820 | */ | |
821 | void vme_master_free(struct vme_resource *resource) | |
822 | { | |
823 | struct vme_master_resource *master_image; | |
824 | ||
825 | if (resource->type != VME_MASTER) { | |
826 | printk(KERN_ERR "Not a master resource\n"); | |
827 | return; | |
828 | } | |
829 | ||
830 | master_image = list_entry(resource->entry, struct vme_master_resource, | |
831 | list); | |
832 | if (!master_image) { | |
833 | printk(KERN_ERR "Can't find master resource\n"); | |
834 | return; | |
835 | } | |
836 | ||
837 | /* Unlock image */ | |
838 | spin_lock(&master_image->lock); | |
839 | if (master_image->locked == 0) | |
840 | printk(KERN_ERR "Image is already free\n"); | |
841 | ||
842 | master_image->locked = 0; | |
843 | spin_unlock(&master_image->lock); | |
844 | ||
845 | /* Free up resource memory */ | |
846 | kfree(resource); | |
847 | } | |
848 | EXPORT_SYMBOL(vme_master_free); | |
849 | ||
850 | /** | |
851 | * vme_dma_request - Request a DMA controller. | |
852 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
853 | * @route: Required src/destination combination. | |
854 | * | |
855 | * Request a VME DMA controller with capability to perform transfers bewteen | |
856 | * requested source/destination combination. | |
857 | * | |
858 | * Return: Pointer to VME DMA resource on success, NULL on failure. | |
859 | */ | |
860 | struct vme_resource *vme_dma_request(struct vme_dev *vdev, u32 route) | |
861 | { | |
862 | struct vme_bridge *bridge; | |
863 | struct list_head *dma_pos = NULL; | |
864 | struct vme_dma_resource *allocated_ctrlr = NULL; | |
865 | struct vme_dma_resource *dma_ctrlr = NULL; | |
866 | struct vme_resource *resource = NULL; | |
867 | ||
868 | /* XXX Not checking resource attributes */ | |
869 | printk(KERN_ERR "No VME resource Attribute tests done\n"); | |
870 | ||
871 | bridge = vdev->bridge; | |
872 | if (!bridge) { | |
873 | printk(KERN_ERR "Can't find VME bus\n"); | |
874 | goto err_bus; | |
875 | } | |
876 | ||
877 | /* Loop through DMA resources */ | |
878 | list_for_each(dma_pos, &bridge->dma_resources) { | |
879 | dma_ctrlr = list_entry(dma_pos, | |
880 | struct vme_dma_resource, list); | |
881 | if (!dma_ctrlr) { | |
882 | printk(KERN_ERR "Registered NULL DMA resource\n"); | |
883 | continue; | |
884 | } | |
885 | ||
886 | /* Find an unlocked and compatible controller */ | |
887 | mutex_lock(&dma_ctrlr->mtx); | |
888 | if (((dma_ctrlr->route_attr & route) == route) && | |
889 | (dma_ctrlr->locked == 0)) { | |
890 | ||
891 | dma_ctrlr->locked = 1; | |
892 | mutex_unlock(&dma_ctrlr->mtx); | |
893 | allocated_ctrlr = dma_ctrlr; | |
894 | break; | |
895 | } | |
896 | mutex_unlock(&dma_ctrlr->mtx); | |
897 | } | |
898 | ||
899 | /* Check to see if we found a resource */ | |
900 | if (!allocated_ctrlr) | |
901 | goto err_ctrlr; | |
902 | ||
903 | resource = kmalloc(sizeof(*resource), GFP_KERNEL); | |
904 | if (!resource) | |
905 | goto err_alloc; | |
906 | ||
907 | resource->type = VME_DMA; | |
908 | resource->entry = &allocated_ctrlr->list; | |
909 | ||
910 | return resource; | |
911 | ||
912 | err_alloc: | |
913 | /* Unlock image */ | |
914 | mutex_lock(&dma_ctrlr->mtx); | |
915 | dma_ctrlr->locked = 0; | |
916 | mutex_unlock(&dma_ctrlr->mtx); | |
917 | err_ctrlr: | |
918 | err_bus: | |
919 | return NULL; | |
920 | } | |
921 | EXPORT_SYMBOL(vme_dma_request); | |
922 | ||
923 | /** | |
924 | * vme_new_dma_list - Create new VME DMA list. | |
925 | * @resource: Pointer to VME DMA resource. | |
926 | * | |
927 | * Create a new VME DMA list. It is the responsibility of the user to free | |
928 | * the list once it is no longer required with vme_dma_list_free(). | |
929 | * | |
930 | * Return: Pointer to new VME DMA list, NULL on allocation failure or invalid | |
931 | * VME DMA resource. | |
932 | */ | |
933 | struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource) | |
934 | { | |
935 | struct vme_dma_list *dma_list; | |
936 | ||
937 | if (resource->type != VME_DMA) { | |
938 | printk(KERN_ERR "Not a DMA resource\n"); | |
939 | return NULL; | |
940 | } | |
941 | ||
942 | dma_list = kmalloc(sizeof(*dma_list), GFP_KERNEL); | |
943 | if (!dma_list) | |
944 | return NULL; | |
945 | ||
946 | INIT_LIST_HEAD(&dma_list->entries); | |
947 | dma_list->parent = list_entry(resource->entry, | |
948 | struct vme_dma_resource, | |
949 | list); | |
950 | mutex_init(&dma_list->mtx); | |
951 | ||
952 | return dma_list; | |
953 | } | |
954 | EXPORT_SYMBOL(vme_new_dma_list); | |
955 | ||
956 | /** | |
957 | * vme_dma_pattern_attribute - Create "Pattern" type VME DMA list attribute. | |
958 | * @pattern: Value to use used as pattern | |
959 | * @type: Type of pattern to be written. | |
960 | * | |
961 | * Create VME DMA list attribute for pattern generation. It is the | |
962 | * responsibility of the user to free used attributes using | |
963 | * vme_dma_free_attribute(). | |
964 | * | |
965 | * Return: Pointer to VME DMA attribute, NULL on failure. | |
966 | */ | |
967 | struct vme_dma_attr *vme_dma_pattern_attribute(u32 pattern, u32 type) | |
968 | { | |
969 | struct vme_dma_attr *attributes; | |
970 | struct vme_dma_pattern *pattern_attr; | |
971 | ||
972 | attributes = kmalloc(sizeof(*attributes), GFP_KERNEL); | |
973 | if (!attributes) | |
974 | goto err_attr; | |
975 | ||
976 | pattern_attr = kmalloc(sizeof(*pattern_attr), GFP_KERNEL); | |
977 | if (!pattern_attr) | |
978 | goto err_pat; | |
979 | ||
980 | attributes->type = VME_DMA_PATTERN; | |
981 | attributes->private = (void *)pattern_attr; | |
982 | ||
983 | pattern_attr->pattern = pattern; | |
984 | pattern_attr->type = type; | |
985 | ||
986 | return attributes; | |
987 | ||
988 | err_pat: | |
989 | kfree(attributes); | |
990 | err_attr: | |
991 | return NULL; | |
992 | } | |
993 | EXPORT_SYMBOL(vme_dma_pattern_attribute); | |
994 | ||
995 | /** | |
996 | * vme_dma_pci_attribute - Create "PCI" type VME DMA list attribute. | |
997 | * @address: PCI base address for DMA transfer. | |
998 | * | |
999 | * Create VME DMA list attribute pointing to a location on PCI for DMA | |
1000 | * transfers. It is the responsibility of the user to free used attributes | |
1001 | * using vme_dma_free_attribute(). | |
1002 | * | |
1003 | * Return: Pointer to VME DMA attribute, NULL on failure. | |
1004 | */ | |
1005 | struct vme_dma_attr *vme_dma_pci_attribute(dma_addr_t address) | |
1006 | { | |
1007 | struct vme_dma_attr *attributes; | |
1008 | struct vme_dma_pci *pci_attr; | |
1009 | ||
1010 | /* XXX Run some sanity checks here */ | |
1011 | ||
1012 | attributes = kmalloc(sizeof(*attributes), GFP_KERNEL); | |
1013 | if (!attributes) | |
1014 | goto err_attr; | |
1015 | ||
1016 | pci_attr = kmalloc(sizeof(*pci_attr), GFP_KERNEL); | |
1017 | if (!pci_attr) | |
1018 | goto err_pci; | |
1019 | ||
1020 | attributes->type = VME_DMA_PCI; | |
1021 | attributes->private = (void *)pci_attr; | |
1022 | ||
1023 | pci_attr->address = address; | |
1024 | ||
1025 | return attributes; | |
1026 | ||
1027 | err_pci: | |
1028 | kfree(attributes); | |
1029 | err_attr: | |
1030 | return NULL; | |
1031 | } | |
1032 | EXPORT_SYMBOL(vme_dma_pci_attribute); | |
1033 | ||
1034 | /** | |
1035 | * vme_dma_vme_attribute - Create "VME" type VME DMA list attribute. | |
1036 | * @address: VME base address for DMA transfer. | |
1037 | * @aspace: VME address space to use for DMA transfer. | |
1038 | * @cycle: VME bus cycle to use for DMA transfer. | |
1039 | * @dwidth: VME data width to use for DMA transfer. | |
1040 | * | |
1041 | * Create VME DMA list attribute pointing to a location on the VME bus for DMA | |
1042 | * transfers. It is the responsibility of the user to free used attributes | |
1043 | * using vme_dma_free_attribute(). | |
1044 | * | |
1045 | * Return: Pointer to VME DMA attribute, NULL on failure. | |
1046 | */ | |
1047 | struct vme_dma_attr *vme_dma_vme_attribute(unsigned long long address, | |
1048 | u32 aspace, u32 cycle, u32 dwidth) | |
1049 | { | |
1050 | struct vme_dma_attr *attributes; | |
1051 | struct vme_dma_vme *vme_attr; | |
1052 | ||
1053 | attributes = kmalloc(sizeof(*attributes), GFP_KERNEL); | |
1054 | if (!attributes) | |
1055 | goto err_attr; | |
1056 | ||
1057 | vme_attr = kmalloc(sizeof(*vme_attr), GFP_KERNEL); | |
1058 | if (!vme_attr) | |
1059 | goto err_vme; | |
1060 | ||
1061 | attributes->type = VME_DMA_VME; | |
1062 | attributes->private = (void *)vme_attr; | |
1063 | ||
1064 | vme_attr->address = address; | |
1065 | vme_attr->aspace = aspace; | |
1066 | vme_attr->cycle = cycle; | |
1067 | vme_attr->dwidth = dwidth; | |
1068 | ||
1069 | return attributes; | |
1070 | ||
1071 | err_vme: | |
1072 | kfree(attributes); | |
1073 | err_attr: | |
1074 | return NULL; | |
1075 | } | |
1076 | EXPORT_SYMBOL(vme_dma_vme_attribute); | |
1077 | ||
1078 | /** | |
1079 | * vme_dma_free_attribute - Free DMA list attribute. | |
1080 | * @attributes: Pointer to DMA list attribute. | |
1081 | * | |
1082 | * Free VME DMA list attribute. VME DMA list attributes can be safely freed | |
1083 | * once vme_dma_list_add() has returned. | |
1084 | */ | |
1085 | void vme_dma_free_attribute(struct vme_dma_attr *attributes) | |
1086 | { | |
1087 | kfree(attributes->private); | |
1088 | kfree(attributes); | |
1089 | } | |
1090 | EXPORT_SYMBOL(vme_dma_free_attribute); | |
1091 | ||
1092 | /** | |
1093 | * vme_dma_list_add - Add enty to a VME DMA list. | |
1094 | * @list: Pointer to VME list. | |
1095 | * @src: Pointer to DMA list attribute to use as source. | |
1096 | * @dest: Pointer to DMA list attribute to use as destination. | |
1097 | * @count: Number of bytes to transfer. | |
1098 | * | |
1099 | * Add an entry to the provided VME DMA list. Entry requires pointers to source | |
1100 | * and destination DMA attributes and a count. | |
1101 | * | |
1102 | * Please note, the attributes supported as source and destinations for | |
1103 | * transfers are hardware dependent. | |
1104 | * | |
1105 | * Return: Zero on success, -EINVAL if operation is not supported on this | |
1106 | * device or if the link list has already been submitted for execution. | |
1107 | * Hardware specific errors also possible. | |
1108 | */ | |
1109 | int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src, | |
1110 | struct vme_dma_attr *dest, size_t count) | |
1111 | { | |
1112 | struct vme_bridge *bridge = list->parent->parent; | |
1113 | int retval; | |
1114 | ||
1115 | if (!bridge->dma_list_add) { | |
1116 | printk(KERN_WARNING "Link List DMA generation not supported\n"); | |
1117 | return -EINVAL; | |
1118 | } | |
1119 | ||
1120 | if (!mutex_trylock(&list->mtx)) { | |
1121 | printk(KERN_ERR "Link List already submitted\n"); | |
1122 | return -EINVAL; | |
1123 | } | |
1124 | ||
1125 | retval = bridge->dma_list_add(list, src, dest, count); | |
1126 | ||
1127 | mutex_unlock(&list->mtx); | |
1128 | ||
1129 | return retval; | |
1130 | } | |
1131 | EXPORT_SYMBOL(vme_dma_list_add); | |
1132 | ||
1133 | /** | |
1134 | * vme_dma_list_exec - Queue a VME DMA list for execution. | |
1135 | * @list: Pointer to VME list. | |
1136 | * | |
1137 | * Queue the provided VME DMA list for execution. The call will return once the | |
1138 | * list has been executed. | |
1139 | * | |
1140 | * Return: Zero on success, -EINVAL if operation is not supported on this | |
1141 | * device. Hardware specific errors also possible. | |
1142 | */ | |
1143 | int vme_dma_list_exec(struct vme_dma_list *list) | |
1144 | { | |
1145 | struct vme_bridge *bridge = list->parent->parent; | |
1146 | int retval; | |
1147 | ||
1148 | if (!bridge->dma_list_exec) { | |
1149 | printk(KERN_ERR "Link List DMA execution not supported\n"); | |
1150 | return -EINVAL; | |
1151 | } | |
1152 | ||
1153 | mutex_lock(&list->mtx); | |
1154 | ||
1155 | retval = bridge->dma_list_exec(list); | |
1156 | ||
1157 | mutex_unlock(&list->mtx); | |
1158 | ||
1159 | return retval; | |
1160 | } | |
1161 | EXPORT_SYMBOL(vme_dma_list_exec); | |
1162 | ||
1163 | /** | |
1164 | * vme_dma_list_free - Free a VME DMA list. | |
1165 | * @list: Pointer to VME list. | |
1166 | * | |
1167 | * Free the provided DMA list and all its entries. | |
1168 | * | |
1169 | * Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource | |
1170 | * is still in use. Hardware specific errors also possible. | |
1171 | */ | |
1172 | int vme_dma_list_free(struct vme_dma_list *list) | |
1173 | { | |
1174 | struct vme_bridge *bridge = list->parent->parent; | |
1175 | int retval; | |
1176 | ||
1177 | if (!bridge->dma_list_empty) { | |
1178 | printk(KERN_WARNING "Emptying of Link Lists not supported\n"); | |
1179 | return -EINVAL; | |
1180 | } | |
1181 | ||
1182 | if (!mutex_trylock(&list->mtx)) { | |
1183 | printk(KERN_ERR "Link List in use\n"); | |
1184 | return -EBUSY; | |
1185 | } | |
1186 | ||
1187 | /* | |
1188 | * Empty out all of the entries from the DMA list. We need to go to the | |
1189 | * low level driver as DMA entries are driver specific. | |
1190 | */ | |
1191 | retval = bridge->dma_list_empty(list); | |
1192 | if (retval) { | |
1193 | printk(KERN_ERR "Unable to empty link-list entries\n"); | |
1194 | mutex_unlock(&list->mtx); | |
1195 | return retval; | |
1196 | } | |
1197 | mutex_unlock(&list->mtx); | |
1198 | kfree(list); | |
1199 | ||
1200 | return retval; | |
1201 | } | |
1202 | EXPORT_SYMBOL(vme_dma_list_free); | |
1203 | ||
1204 | /** | |
1205 | * vme_dma_free - Free a VME DMA resource. | |
1206 | * @resource: Pointer to VME DMA resource. | |
1207 | * | |
1208 | * Free the provided DMA resource so that it may be reallocated. | |
1209 | * | |
1210 | * Return: Zero on success, -EINVAL on invalid VME resource, -EBUSY if resource | |
1211 | * is still active. | |
1212 | */ | |
1213 | int vme_dma_free(struct vme_resource *resource) | |
1214 | { | |
1215 | struct vme_dma_resource *ctrlr; | |
1216 | ||
1217 | if (resource->type != VME_DMA) { | |
1218 | printk(KERN_ERR "Not a DMA resource\n"); | |
1219 | return -EINVAL; | |
1220 | } | |
1221 | ||
1222 | ctrlr = list_entry(resource->entry, struct vme_dma_resource, list); | |
1223 | ||
1224 | if (!mutex_trylock(&ctrlr->mtx)) { | |
1225 | printk(KERN_ERR "Resource busy, can't free\n"); | |
1226 | return -EBUSY; | |
1227 | } | |
1228 | ||
1229 | if (!(list_empty(&ctrlr->pending) && list_empty(&ctrlr->running))) { | |
1230 | printk(KERN_WARNING "Resource still processing transfers\n"); | |
1231 | mutex_unlock(&ctrlr->mtx); | |
1232 | return -EBUSY; | |
1233 | } | |
1234 | ||
1235 | ctrlr->locked = 0; | |
1236 | ||
1237 | mutex_unlock(&ctrlr->mtx); | |
1238 | ||
1239 | kfree(resource); | |
1240 | ||
1241 | return 0; | |
1242 | } | |
1243 | EXPORT_SYMBOL(vme_dma_free); | |
1244 | ||
1245 | void vme_bus_error_handler(struct vme_bridge *bridge, | |
1246 | unsigned long long address, int am) | |
1247 | { | |
1248 | struct list_head *handler_pos = NULL; | |
1249 | struct vme_error_handler *handler; | |
1250 | int handler_triggered = 0; | |
1251 | u32 aspace = vme_get_aspace(am); | |
1252 | ||
1253 | list_for_each(handler_pos, &bridge->vme_error_handlers) { | |
1254 | handler = list_entry(handler_pos, struct vme_error_handler, | |
1255 | list); | |
1256 | if ((aspace == handler->aspace) && | |
1257 | (address >= handler->start) && | |
1258 | (address < handler->end)) { | |
1259 | if (!handler->num_errors) | |
1260 | handler->first_error = address; | |
1261 | if (handler->num_errors != UINT_MAX) | |
1262 | handler->num_errors++; | |
1263 | handler_triggered = 1; | |
1264 | } | |
1265 | } | |
1266 | ||
1267 | if (!handler_triggered) | |
1268 | dev_err(bridge->parent, | |
1269 | "Unhandled VME access error at address 0x%llx\n", | |
1270 | address); | |
1271 | } | |
1272 | EXPORT_SYMBOL(vme_bus_error_handler); | |
1273 | ||
1274 | struct vme_error_handler *vme_register_error_handler( | |
1275 | struct vme_bridge *bridge, u32 aspace, | |
1276 | unsigned long long address, size_t len) | |
1277 | { | |
1278 | struct vme_error_handler *handler; | |
1279 | ||
1280 | handler = kmalloc(sizeof(*handler), GFP_ATOMIC); | |
1281 | if (!handler) | |
1282 | return NULL; | |
1283 | ||
1284 | handler->aspace = aspace; | |
1285 | handler->start = address; | |
1286 | handler->end = address + len; | |
1287 | handler->num_errors = 0; | |
1288 | handler->first_error = 0; | |
1289 | list_add_tail(&handler->list, &bridge->vme_error_handlers); | |
1290 | ||
1291 | return handler; | |
1292 | } | |
1293 | EXPORT_SYMBOL(vme_register_error_handler); | |
1294 | ||
1295 | void vme_unregister_error_handler(struct vme_error_handler *handler) | |
1296 | { | |
1297 | list_del(&handler->list); | |
1298 | kfree(handler); | |
1299 | } | |
1300 | EXPORT_SYMBOL(vme_unregister_error_handler); | |
1301 | ||
1302 | void vme_irq_handler(struct vme_bridge *bridge, int level, int statid) | |
1303 | { | |
1304 | void (*call)(int, int, void *); | |
1305 | void *priv_data; | |
1306 | ||
1307 | call = bridge->irq[level - 1].callback[statid].func; | |
1308 | priv_data = bridge->irq[level - 1].callback[statid].priv_data; | |
1309 | if (call) | |
1310 | call(level, statid, priv_data); | |
1311 | else | |
1312 | printk(KERN_WARNING "Spurious VME interrupt, level:%x, vector:%x\n", | |
1313 | level, statid); | |
1314 | } | |
1315 | EXPORT_SYMBOL(vme_irq_handler); | |
1316 | ||
1317 | /** | |
1318 | * vme_irq_request - Request a specific VME interrupt. | |
1319 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
1320 | * @level: Interrupt priority being requested. | |
1321 | * @statid: Interrupt vector being requested. | |
1322 | * @callback: Pointer to callback function called when VME interrupt/vector | |
1323 | * received. | |
1324 | * @priv_data: Generic pointer that will be passed to the callback function. | |
1325 | * | |
1326 | * Request callback to be attached as a handler for VME interrupts with provided | |
1327 | * level and statid. | |
1328 | * | |
1329 | * Return: Zero on success, -EINVAL on invalid vme device, level or if the | |
1330 | * function is not supported, -EBUSY if the level/statid combination is | |
1331 | * already in use. Hardware specific errors also possible. | |
1332 | */ | |
1333 | int vme_irq_request(struct vme_dev *vdev, int level, int statid, | |
1334 | void (*callback)(int, int, void *), | |
1335 | void *priv_data) | |
1336 | { | |
1337 | struct vme_bridge *bridge; | |
1338 | ||
1339 | bridge = vdev->bridge; | |
1340 | if (!bridge) { | |
1341 | printk(KERN_ERR "Can't find VME bus\n"); | |
1342 | return -EINVAL; | |
1343 | } | |
1344 | ||
1345 | if ((level < 1) || (level > 7)) { | |
1346 | printk(KERN_ERR "Invalid interrupt level\n"); | |
1347 | return -EINVAL; | |
1348 | } | |
1349 | ||
1350 | if (!bridge->irq_set) { | |
1351 | printk(KERN_ERR "Configuring interrupts not supported\n"); | |
1352 | return -EINVAL; | |
1353 | } | |
1354 | ||
1355 | mutex_lock(&bridge->irq_mtx); | |
1356 | ||
1357 | if (bridge->irq[level - 1].callback[statid].func) { | |
1358 | mutex_unlock(&bridge->irq_mtx); | |
1359 | printk(KERN_WARNING "VME Interrupt already taken\n"); | |
1360 | return -EBUSY; | |
1361 | } | |
1362 | ||
1363 | bridge->irq[level - 1].count++; | |
1364 | bridge->irq[level - 1].callback[statid].priv_data = priv_data; | |
1365 | bridge->irq[level - 1].callback[statid].func = callback; | |
1366 | ||
1367 | /* Enable IRQ level */ | |
1368 | bridge->irq_set(bridge, level, 1, 1); | |
1369 | ||
1370 | mutex_unlock(&bridge->irq_mtx); | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | EXPORT_SYMBOL(vme_irq_request); | |
1375 | ||
1376 | /** | |
1377 | * vme_irq_free - Free a VME interrupt. | |
1378 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
1379 | * @level: Interrupt priority of interrupt being freed. | |
1380 | * @statid: Interrupt vector of interrupt being freed. | |
1381 | * | |
1382 | * Remove previously attached callback from VME interrupt priority/vector. | |
1383 | */ | |
1384 | void vme_irq_free(struct vme_dev *vdev, int level, int statid) | |
1385 | { | |
1386 | struct vme_bridge *bridge; | |
1387 | ||
1388 | bridge = vdev->bridge; | |
1389 | if (!bridge) { | |
1390 | printk(KERN_ERR "Can't find VME bus\n"); | |
1391 | return; | |
1392 | } | |
1393 | ||
1394 | if ((level < 1) || (level > 7)) { | |
1395 | printk(KERN_ERR "Invalid interrupt level\n"); | |
1396 | return; | |
1397 | } | |
1398 | ||
1399 | if (!bridge->irq_set) { | |
1400 | printk(KERN_ERR "Configuring interrupts not supported\n"); | |
1401 | return; | |
1402 | } | |
1403 | ||
1404 | mutex_lock(&bridge->irq_mtx); | |
1405 | ||
1406 | bridge->irq[level - 1].count--; | |
1407 | ||
1408 | /* Disable IRQ level if no more interrupts attached at this level*/ | |
1409 | if (bridge->irq[level - 1].count == 0) | |
1410 | bridge->irq_set(bridge, level, 0, 1); | |
1411 | ||
1412 | bridge->irq[level - 1].callback[statid].func = NULL; | |
1413 | bridge->irq[level - 1].callback[statid].priv_data = NULL; | |
1414 | ||
1415 | mutex_unlock(&bridge->irq_mtx); | |
1416 | } | |
1417 | EXPORT_SYMBOL(vme_irq_free); | |
1418 | ||
1419 | /** | |
1420 | * vme_irq_generate - Generate VME interrupt. | |
1421 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
1422 | * @level: Interrupt priority at which to assert the interrupt. | |
1423 | * @statid: Interrupt vector to associate with the interrupt. | |
1424 | * | |
1425 | * Generate a VME interrupt of the provided level and with the provided | |
1426 | * statid. | |
1427 | * | |
1428 | * Return: Zero on success, -EINVAL on invalid vme device, level or if the | |
1429 | * function is not supported. Hardware specific errors also possible. | |
1430 | */ | |
1431 | int vme_irq_generate(struct vme_dev *vdev, int level, int statid) | |
1432 | { | |
1433 | struct vme_bridge *bridge; | |
1434 | ||
1435 | bridge = vdev->bridge; | |
1436 | if (!bridge) { | |
1437 | printk(KERN_ERR "Can't find VME bus\n"); | |
1438 | return -EINVAL; | |
1439 | } | |
1440 | ||
1441 | if ((level < 1) || (level > 7)) { | |
1442 | printk(KERN_WARNING "Invalid interrupt level\n"); | |
1443 | return -EINVAL; | |
1444 | } | |
1445 | ||
1446 | if (!bridge->irq_generate) { | |
1447 | printk(KERN_WARNING "Interrupt generation not supported\n"); | |
1448 | return -EINVAL; | |
1449 | } | |
1450 | ||
1451 | return bridge->irq_generate(bridge, level, statid); | |
1452 | } | |
1453 | EXPORT_SYMBOL(vme_irq_generate); | |
1454 | ||
1455 | /** | |
1456 | * vme_lm_request - Request a VME location monitor | |
1457 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
1458 | * | |
1459 | * Allocate a location monitor resource to the driver. A location monitor | |
1460 | * allows the driver to monitor accesses to a contiguous number of | |
1461 | * addresses on the VME bus. | |
1462 | * | |
1463 | * Return: Pointer to a VME resource on success or NULL on failure. | |
1464 | */ | |
1465 | struct vme_resource *vme_lm_request(struct vme_dev *vdev) | |
1466 | { | |
1467 | struct vme_bridge *bridge; | |
1468 | struct list_head *lm_pos = NULL; | |
1469 | struct vme_lm_resource *allocated_lm = NULL; | |
1470 | struct vme_lm_resource *lm = NULL; | |
1471 | struct vme_resource *resource = NULL; | |
1472 | ||
1473 | bridge = vdev->bridge; | |
1474 | if (!bridge) { | |
1475 | printk(KERN_ERR "Can't find VME bus\n"); | |
1476 | goto err_bus; | |
1477 | } | |
1478 | ||
1479 | /* Loop through LM resources */ | |
1480 | list_for_each(lm_pos, &bridge->lm_resources) { | |
1481 | lm = list_entry(lm_pos, | |
1482 | struct vme_lm_resource, list); | |
1483 | if (!lm) { | |
1484 | printk(KERN_ERR "Registered NULL Location Monitor resource\n"); | |
1485 | continue; | |
1486 | } | |
1487 | ||
1488 | /* Find an unlocked controller */ | |
1489 | mutex_lock(&lm->mtx); | |
1490 | if (lm->locked == 0) { | |
1491 | lm->locked = 1; | |
1492 | mutex_unlock(&lm->mtx); | |
1493 | allocated_lm = lm; | |
1494 | break; | |
1495 | } | |
1496 | mutex_unlock(&lm->mtx); | |
1497 | } | |
1498 | ||
1499 | /* Check to see if we found a resource */ | |
1500 | if (!allocated_lm) | |
1501 | goto err_lm; | |
1502 | ||
1503 | resource = kmalloc(sizeof(*resource), GFP_KERNEL); | |
1504 | if (!resource) | |
1505 | goto err_alloc; | |
1506 | ||
1507 | resource->type = VME_LM; | |
1508 | resource->entry = &allocated_lm->list; | |
1509 | ||
1510 | return resource; | |
1511 | ||
1512 | err_alloc: | |
1513 | /* Unlock image */ | |
1514 | mutex_lock(&lm->mtx); | |
1515 | lm->locked = 0; | |
1516 | mutex_unlock(&lm->mtx); | |
1517 | err_lm: | |
1518 | err_bus: | |
1519 | return NULL; | |
1520 | } | |
1521 | EXPORT_SYMBOL(vme_lm_request); | |
1522 | ||
1523 | /** | |
1524 | * vme_lm_count - Determine number of VME Addresses monitored | |
1525 | * @resource: Pointer to VME location monitor resource. | |
1526 | * | |
1527 | * The number of contiguous addresses monitored is hardware dependent. | |
1528 | * Return the number of contiguous addresses monitored by the | |
1529 | * location monitor. | |
1530 | * | |
1531 | * Return: Count of addresses monitored or -EINVAL when provided with an | |
1532 | * invalid location monitor resource. | |
1533 | */ | |
1534 | int vme_lm_count(struct vme_resource *resource) | |
1535 | { | |
1536 | struct vme_lm_resource *lm; | |
1537 | ||
1538 | if (resource->type != VME_LM) { | |
1539 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1540 | return -EINVAL; | |
1541 | } | |
1542 | ||
1543 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1544 | ||
1545 | return lm->monitors; | |
1546 | } | |
1547 | EXPORT_SYMBOL(vme_lm_count); | |
1548 | ||
1549 | /** | |
1550 | * vme_lm_set - Configure location monitor | |
1551 | * @resource: Pointer to VME location monitor resource. | |
1552 | * @lm_base: Base address to monitor. | |
1553 | * @aspace: VME address space to monitor. | |
1554 | * @cycle: VME bus cycle type to monitor. | |
1555 | * | |
1556 | * Set the base address, address space and cycle type of accesses to be | |
1557 | * monitored by the location monitor. | |
1558 | * | |
1559 | * Return: Zero on success, -EINVAL when provided with an invalid location | |
1560 | * monitor resource or function is not supported. Hardware specific | |
1561 | * errors may also be returned. | |
1562 | */ | |
1563 | int vme_lm_set(struct vme_resource *resource, unsigned long long lm_base, | |
1564 | u32 aspace, u32 cycle) | |
1565 | { | |
1566 | struct vme_bridge *bridge = find_bridge(resource); | |
1567 | struct vme_lm_resource *lm; | |
1568 | ||
1569 | if (resource->type != VME_LM) { | |
1570 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1571 | return -EINVAL; | |
1572 | } | |
1573 | ||
1574 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1575 | ||
1576 | if (!bridge->lm_set) { | |
1577 | printk(KERN_ERR "vme_lm_set not supported\n"); | |
1578 | return -EINVAL; | |
1579 | } | |
1580 | ||
1581 | return bridge->lm_set(lm, lm_base, aspace, cycle); | |
1582 | } | |
1583 | EXPORT_SYMBOL(vme_lm_set); | |
1584 | ||
1585 | /** | |
1586 | * vme_lm_get - Retrieve location monitor settings | |
1587 | * @resource: Pointer to VME location monitor resource. | |
1588 | * @lm_base: Pointer used to output the base address monitored. | |
1589 | * @aspace: Pointer used to output the address space monitored. | |
1590 | * @cycle: Pointer used to output the VME bus cycle type monitored. | |
1591 | * | |
1592 | * Retrieve the base address, address space and cycle type of accesses to | |
1593 | * be monitored by the location monitor. | |
1594 | * | |
1595 | * Return: Zero on success, -EINVAL when provided with an invalid location | |
1596 | * monitor resource or function is not supported. Hardware specific | |
1597 | * errors may also be returned. | |
1598 | */ | |
1599 | int vme_lm_get(struct vme_resource *resource, unsigned long long *lm_base, | |
1600 | u32 *aspace, u32 *cycle) | |
1601 | { | |
1602 | struct vme_bridge *bridge = find_bridge(resource); | |
1603 | struct vme_lm_resource *lm; | |
1604 | ||
1605 | if (resource->type != VME_LM) { | |
1606 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1607 | return -EINVAL; | |
1608 | } | |
1609 | ||
1610 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1611 | ||
1612 | if (!bridge->lm_get) { | |
1613 | printk(KERN_ERR "vme_lm_get not supported\n"); | |
1614 | return -EINVAL; | |
1615 | } | |
1616 | ||
1617 | return bridge->lm_get(lm, lm_base, aspace, cycle); | |
1618 | } | |
1619 | EXPORT_SYMBOL(vme_lm_get); | |
1620 | ||
1621 | /** | |
1622 | * vme_lm_attach - Provide callback for location monitor address | |
1623 | * @resource: Pointer to VME location monitor resource. | |
1624 | * @monitor: Offset to which callback should be attached. | |
1625 | * @callback: Pointer to callback function called when triggered. | |
1626 | * @data: Generic pointer that will be passed to the callback function. | |
1627 | * | |
1628 | * Attach a callback to the specificed offset into the location monitors | |
1629 | * monitored addresses. A generic pointer is provided to allow data to be | |
1630 | * passed to the callback when called. | |
1631 | * | |
1632 | * Return: Zero on success, -EINVAL when provided with an invalid location | |
1633 | * monitor resource or function is not supported. Hardware specific | |
1634 | * errors may also be returned. | |
1635 | */ | |
1636 | int vme_lm_attach(struct vme_resource *resource, int monitor, | |
1637 | void (*callback)(void *), void *data) | |
1638 | { | |
1639 | struct vme_bridge *bridge = find_bridge(resource); | |
1640 | struct vme_lm_resource *lm; | |
1641 | ||
1642 | if (resource->type != VME_LM) { | |
1643 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1644 | return -EINVAL; | |
1645 | } | |
1646 | ||
1647 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1648 | ||
1649 | if (!bridge->lm_attach) { | |
1650 | printk(KERN_ERR "vme_lm_attach not supported\n"); | |
1651 | return -EINVAL; | |
1652 | } | |
1653 | ||
1654 | return bridge->lm_attach(lm, monitor, callback, data); | |
1655 | } | |
1656 | EXPORT_SYMBOL(vme_lm_attach); | |
1657 | ||
1658 | /** | |
1659 | * vme_lm_detach - Remove callback for location monitor address | |
1660 | * @resource: Pointer to VME location monitor resource. | |
1661 | * @monitor: Offset to which callback should be removed. | |
1662 | * | |
1663 | * Remove the callback associated with the specificed offset into the | |
1664 | * location monitors monitored addresses. | |
1665 | * | |
1666 | * Return: Zero on success, -EINVAL when provided with an invalid location | |
1667 | * monitor resource or function is not supported. Hardware specific | |
1668 | * errors may also be returned. | |
1669 | */ | |
1670 | int vme_lm_detach(struct vme_resource *resource, int monitor) | |
1671 | { | |
1672 | struct vme_bridge *bridge = find_bridge(resource); | |
1673 | struct vme_lm_resource *lm; | |
1674 | ||
1675 | if (resource->type != VME_LM) { | |
1676 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1677 | return -EINVAL; | |
1678 | } | |
1679 | ||
1680 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1681 | ||
1682 | if (!bridge->lm_detach) { | |
1683 | printk(KERN_ERR "vme_lm_detach not supported\n"); | |
1684 | return -EINVAL; | |
1685 | } | |
1686 | ||
1687 | return bridge->lm_detach(lm, monitor); | |
1688 | } | |
1689 | EXPORT_SYMBOL(vme_lm_detach); | |
1690 | ||
1691 | /** | |
1692 | * vme_lm_free - Free allocated VME location monitor | |
1693 | * @resource: Pointer to VME location monitor resource. | |
1694 | * | |
1695 | * Free allocation of a VME location monitor. | |
1696 | * | |
1697 | * WARNING: This function currently expects that any callbacks that have | |
1698 | * been attached to the location monitor have been removed. | |
1699 | * | |
1700 | * Return: Zero on success, -EINVAL when provided with an invalid location | |
1701 | * monitor resource. | |
1702 | */ | |
1703 | void vme_lm_free(struct vme_resource *resource) | |
1704 | { | |
1705 | struct vme_lm_resource *lm; | |
1706 | ||
1707 | if (resource->type != VME_LM) { | |
1708 | printk(KERN_ERR "Not a Location Monitor resource\n"); | |
1709 | return; | |
1710 | } | |
1711 | ||
1712 | lm = list_entry(resource->entry, struct vme_lm_resource, list); | |
1713 | ||
1714 | mutex_lock(&lm->mtx); | |
1715 | ||
1716 | /* XXX | |
1717 | * Check to see that there aren't any callbacks still attached, if | |
1718 | * there are we should probably be detaching them! | |
1719 | */ | |
1720 | ||
1721 | lm->locked = 0; | |
1722 | ||
1723 | mutex_unlock(&lm->mtx); | |
1724 | ||
1725 | kfree(resource); | |
1726 | } | |
1727 | EXPORT_SYMBOL(vme_lm_free); | |
1728 | ||
1729 | /** | |
1730 | * vme_slot_num - Retrieve slot ID | |
1731 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
1732 | * | |
1733 | * Retrieve the slot ID associated with the provided VME device. | |
1734 | * | |
1735 | * Return: The slot ID on success, -EINVAL if VME bridge cannot be determined | |
1736 | * or the function is not supported. Hardware specific errors may also | |
1737 | * be returned. | |
1738 | */ | |
1739 | int vme_slot_num(struct vme_dev *vdev) | |
1740 | { | |
1741 | struct vme_bridge *bridge; | |
1742 | ||
1743 | bridge = vdev->bridge; | |
1744 | if (!bridge) { | |
1745 | printk(KERN_ERR "Can't find VME bus\n"); | |
1746 | return -EINVAL; | |
1747 | } | |
1748 | ||
1749 | if (!bridge->slot_get) { | |
1750 | printk(KERN_WARNING "vme_slot_num not supported\n"); | |
1751 | return -EINVAL; | |
1752 | } | |
1753 | ||
1754 | return bridge->slot_get(bridge); | |
1755 | } | |
1756 | EXPORT_SYMBOL(vme_slot_num); | |
1757 | ||
1758 | /** | |
1759 | * vme_bus_num - Retrieve bus number | |
1760 | * @vdev: Pointer to VME device struct vme_dev assigned to driver instance. | |
1761 | * | |
1762 | * Retrieve the bus enumeration associated with the provided VME device. | |
1763 | * | |
1764 | * Return: The bus number on success, -EINVAL if VME bridge cannot be | |
1765 | * determined. | |
1766 | */ | |
1767 | int vme_bus_num(struct vme_dev *vdev) | |
1768 | { | |
1769 | struct vme_bridge *bridge; | |
1770 | ||
1771 | bridge = vdev->bridge; | |
1772 | if (!bridge) { | |
1773 | pr_err("Can't find VME bus\n"); | |
1774 | return -EINVAL; | |
1775 | } | |
1776 | ||
1777 | return bridge->num; | |
1778 | } | |
1779 | EXPORT_SYMBOL(vme_bus_num); | |
1780 | ||
1781 | /* - Bridge Registration --------------------------------------------------- */ | |
1782 | ||
1783 | static void vme_dev_release(struct device *dev) | |
1784 | { | |
1785 | kfree(dev_to_vme_dev(dev)); | |
1786 | } | |
1787 | ||
1788 | /* Common bridge initialization */ | |
1789 | struct vme_bridge *vme_init_bridge(struct vme_bridge *bridge) | |
1790 | { | |
1791 | INIT_LIST_HEAD(&bridge->vme_error_handlers); | |
1792 | INIT_LIST_HEAD(&bridge->master_resources); | |
1793 | INIT_LIST_HEAD(&bridge->slave_resources); | |
1794 | INIT_LIST_HEAD(&bridge->dma_resources); | |
1795 | INIT_LIST_HEAD(&bridge->lm_resources); | |
1796 | mutex_init(&bridge->irq_mtx); | |
1797 | ||
1798 | return bridge; | |
1799 | } | |
1800 | EXPORT_SYMBOL(vme_init_bridge); | |
1801 | ||
1802 | int vme_register_bridge(struct vme_bridge *bridge) | |
1803 | { | |
1804 | int i; | |
1805 | int ret = -1; | |
1806 | ||
1807 | mutex_lock(&vme_buses_lock); | |
1808 | for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) { | |
1809 | if ((vme_bus_numbers & (1 << i)) == 0) { | |
1810 | vme_bus_numbers |= (1 << i); | |
1811 | bridge->num = i; | |
1812 | INIT_LIST_HEAD(&bridge->devices); | |
1813 | list_add_tail(&bridge->bus_list, &vme_bus_list); | |
1814 | ret = 0; | |
1815 | break; | |
1816 | } | |
1817 | } | |
1818 | mutex_unlock(&vme_buses_lock); | |
1819 | ||
1820 | return ret; | |
1821 | } | |
1822 | EXPORT_SYMBOL(vme_register_bridge); | |
1823 | ||
1824 | void vme_unregister_bridge(struct vme_bridge *bridge) | |
1825 | { | |
1826 | struct vme_dev *vdev; | |
1827 | struct vme_dev *tmp; | |
1828 | ||
1829 | mutex_lock(&vme_buses_lock); | |
1830 | vme_bus_numbers &= ~(1 << bridge->num); | |
1831 | list_for_each_entry_safe(vdev, tmp, &bridge->devices, bridge_list) { | |
1832 | list_del(&vdev->drv_list); | |
1833 | list_del(&vdev->bridge_list); | |
1834 | device_unregister(&vdev->dev); | |
1835 | } | |
1836 | list_del(&bridge->bus_list); | |
1837 | mutex_unlock(&vme_buses_lock); | |
1838 | } | |
1839 | EXPORT_SYMBOL(vme_unregister_bridge); | |
1840 | ||
1841 | /* - Driver Registration --------------------------------------------------- */ | |
1842 | ||
1843 | static int __vme_register_driver_bus(struct vme_driver *drv, | |
1844 | struct vme_bridge *bridge, unsigned int ndevs) | |
1845 | { | |
1846 | int err; | |
1847 | unsigned int i; | |
1848 | struct vme_dev *vdev; | |
1849 | struct vme_dev *tmp; | |
1850 | ||
1851 | for (i = 0; i < ndevs; i++) { | |
1852 | vdev = kzalloc(sizeof(*vdev), GFP_KERNEL); | |
1853 | if (!vdev) { | |
1854 | err = -ENOMEM; | |
1855 | goto err_devalloc; | |
1856 | } | |
1857 | vdev->num = i; | |
1858 | vdev->bridge = bridge; | |
1859 | vdev->dev.platform_data = drv; | |
1860 | vdev->dev.release = vme_dev_release; | |
1861 | vdev->dev.parent = bridge->parent; | |
1862 | vdev->dev.bus = &vme_bus_type; | |
1863 | dev_set_name(&vdev->dev, "%s.%u-%u", drv->name, bridge->num, | |
1864 | vdev->num); | |
1865 | ||
1866 | err = device_register(&vdev->dev); | |
1867 | if (err) | |
1868 | goto err_reg; | |
1869 | ||
1870 | if (vdev->dev.platform_data) { | |
1871 | list_add_tail(&vdev->drv_list, &drv->devices); | |
1872 | list_add_tail(&vdev->bridge_list, &bridge->devices); | |
1873 | } else | |
1874 | device_unregister(&vdev->dev); | |
1875 | } | |
1876 | return 0; | |
1877 | ||
1878 | err_reg: | |
1879 | put_device(&vdev->dev); | |
1880 | err_devalloc: | |
1881 | list_for_each_entry_safe(vdev, tmp, &drv->devices, drv_list) { | |
1882 | list_del(&vdev->drv_list); | |
1883 | list_del(&vdev->bridge_list); | |
1884 | device_unregister(&vdev->dev); | |
1885 | } | |
1886 | return err; | |
1887 | } | |
1888 | ||
1889 | static int __vme_register_driver(struct vme_driver *drv, unsigned int ndevs) | |
1890 | { | |
1891 | struct vme_bridge *bridge; | |
1892 | int err = 0; | |
1893 | ||
1894 | mutex_lock(&vme_buses_lock); | |
1895 | list_for_each_entry(bridge, &vme_bus_list, bus_list) { | |
1896 | /* | |
1897 | * This cannot cause trouble as we already have vme_buses_lock | |
1898 | * and if the bridge is removed, it will have to go through | |
1899 | * vme_unregister_bridge() to do it (which calls remove() on | |
1900 | * the bridge which in turn tries to acquire vme_buses_lock and | |
1901 | * will have to wait). | |
1902 | */ | |
1903 | err = __vme_register_driver_bus(drv, bridge, ndevs); | |
1904 | if (err) | |
1905 | break; | |
1906 | } | |
1907 | mutex_unlock(&vme_buses_lock); | |
1908 | return err; | |
1909 | } | |
1910 | ||
1911 | /** | |
1912 | * vme_register_driver - Register a VME driver | |
1913 | * @drv: Pointer to VME driver structure to register. | |
1914 | * @ndevs: Maximum number of devices to allow to be enumerated. | |
1915 | * | |
1916 | * Register a VME device driver with the VME subsystem. | |
1917 | * | |
1918 | * Return: Zero on success, error value on registration failure. | |
1919 | */ | |
1920 | int vme_register_driver(struct vme_driver *drv, unsigned int ndevs) | |
1921 | { | |
1922 | int err; | |
1923 | ||
1924 | drv->driver.name = drv->name; | |
1925 | drv->driver.bus = &vme_bus_type; | |
1926 | INIT_LIST_HEAD(&drv->devices); | |
1927 | ||
1928 | err = driver_register(&drv->driver); | |
1929 | if (err) | |
1930 | return err; | |
1931 | ||
1932 | err = __vme_register_driver(drv, ndevs); | |
1933 | if (err) | |
1934 | driver_unregister(&drv->driver); | |
1935 | ||
1936 | return err; | |
1937 | } | |
1938 | EXPORT_SYMBOL(vme_register_driver); | |
1939 | ||
1940 | /** | |
1941 | * vme_unregister_driver - Unregister a VME driver | |
1942 | * @drv: Pointer to VME driver structure to unregister. | |
1943 | * | |
1944 | * Unregister a VME device driver from the VME subsystem. | |
1945 | */ | |
1946 | void vme_unregister_driver(struct vme_driver *drv) | |
1947 | { | |
1948 | struct vme_dev *dev, *dev_tmp; | |
1949 | ||
1950 | mutex_lock(&vme_buses_lock); | |
1951 | list_for_each_entry_safe(dev, dev_tmp, &drv->devices, drv_list) { | |
1952 | list_del(&dev->drv_list); | |
1953 | list_del(&dev->bridge_list); | |
1954 | device_unregister(&dev->dev); | |
1955 | } | |
1956 | mutex_unlock(&vme_buses_lock); | |
1957 | ||
1958 | driver_unregister(&drv->driver); | |
1959 | } | |
1960 | EXPORT_SYMBOL(vme_unregister_driver); | |
1961 | ||
1962 | /* - Bus Registration ------------------------------------------------------ */ | |
1963 | ||
1964 | static int vme_bus_match(struct device *dev, struct device_driver *drv) | |
1965 | { | |
1966 | struct vme_driver *vme_drv; | |
1967 | ||
1968 | vme_drv = container_of(drv, struct vme_driver, driver); | |
1969 | ||
1970 | if (dev->platform_data == vme_drv) { | |
1971 | struct vme_dev *vdev = dev_to_vme_dev(dev); | |
1972 | ||
1973 | if (vme_drv->match && vme_drv->match(vdev)) | |
1974 | return 1; | |
1975 | ||
1976 | dev->platform_data = NULL; | |
1977 | } | |
1978 | return 0; | |
1979 | } | |
1980 | ||
1981 | static int vme_bus_probe(struct device *dev) | |
1982 | { | |
1983 | struct vme_driver *driver; | |
1984 | struct vme_dev *vdev = dev_to_vme_dev(dev); | |
1985 | ||
1986 | driver = dev->platform_data; | |
1987 | if (driver->probe) | |
1988 | return driver->probe(vdev); | |
1989 | ||
1990 | return -ENODEV; | |
1991 | } | |
1992 | ||
1993 | static int vme_bus_remove(struct device *dev) | |
1994 | { | |
1995 | struct vme_driver *driver; | |
1996 | struct vme_dev *vdev = dev_to_vme_dev(dev); | |
1997 | ||
1998 | driver = dev->platform_data; | |
1999 | if (driver->remove) | |
2000 | return driver->remove(vdev); | |
2001 | ||
2002 | return -ENODEV; | |
2003 | } | |
2004 | ||
2005 | struct bus_type vme_bus_type = { | |
2006 | .name = "vme", | |
2007 | .match = vme_bus_match, | |
2008 | .probe = vme_bus_probe, | |
2009 | .remove = vme_bus_remove, | |
2010 | }; | |
2011 | EXPORT_SYMBOL(vme_bus_type); | |
2012 | ||
2013 | static int __init vme_init(void) | |
2014 | { | |
2015 | return bus_register(&vme_bus_type); | |
2016 | } | |
2017 | subsys_initcall(vme_init); |