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776dc384 TR |
1 | /* |
2 | * Copyright (C) 2012 Avionic Design GmbH | |
3 | * Copyright (C) 2012-2013, NVIDIA Corporation | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms and conditions of the GNU General Public License, | |
7 | * version 2, as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <linux/host1x.h> | |
19 | #include <linux/of.h> | |
20 | #include <linux/slab.h> | |
21 | ||
d24b2898 | 22 | #include "bus.h" |
776dc384 TR |
23 | #include "dev.h" |
24 | ||
25 | static DEFINE_MUTEX(clients_lock); | |
26 | static LIST_HEAD(clients); | |
27 | ||
28 | static DEFINE_MUTEX(drivers_lock); | |
29 | static LIST_HEAD(drivers); | |
30 | ||
31 | static DEFINE_MUTEX(devices_lock); | |
32 | static LIST_HEAD(devices); | |
33 | ||
34 | struct host1x_subdev { | |
35 | struct host1x_client *client; | |
36 | struct device_node *np; | |
37 | struct list_head list; | |
38 | }; | |
39 | ||
40 | /** | |
41 | * host1x_subdev_add() - add a new subdevice with an associated device node | |
42 | */ | |
43 | static int host1x_subdev_add(struct host1x_device *device, | |
44 | struct device_node *np) | |
45 | { | |
46 | struct host1x_subdev *subdev; | |
47 | ||
48 | subdev = kzalloc(sizeof(*subdev), GFP_KERNEL); | |
49 | if (!subdev) | |
50 | return -ENOMEM; | |
51 | ||
52 | INIT_LIST_HEAD(&subdev->list); | |
53 | subdev->np = of_node_get(np); | |
54 | ||
55 | mutex_lock(&device->subdevs_lock); | |
56 | list_add_tail(&subdev->list, &device->subdevs); | |
57 | mutex_unlock(&device->subdevs_lock); | |
58 | ||
59 | return 0; | |
60 | } | |
61 | ||
62 | /** | |
63 | * host1x_subdev_del() - remove subdevice | |
64 | */ | |
65 | static void host1x_subdev_del(struct host1x_subdev *subdev) | |
66 | { | |
67 | list_del(&subdev->list); | |
68 | of_node_put(subdev->np); | |
69 | kfree(subdev); | |
70 | } | |
71 | ||
72 | /** | |
73 | * host1x_device_parse_dt() - scan device tree and add matching subdevices | |
74 | */ | |
75 | static int host1x_device_parse_dt(struct host1x_device *device) | |
76 | { | |
77 | struct device_node *np; | |
78 | int err; | |
79 | ||
80 | for_each_child_of_node(device->dev.parent->of_node, np) { | |
81 | if (of_match_node(device->driver->subdevs, np) && | |
82 | of_device_is_available(np)) { | |
83 | err = host1x_subdev_add(device, np); | |
84 | if (err < 0) | |
85 | return err; | |
86 | } | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | static void host1x_subdev_register(struct host1x_device *device, | |
93 | struct host1x_subdev *subdev, | |
94 | struct host1x_client *client) | |
95 | { | |
96 | int err; | |
97 | ||
98 | /* | |
99 | * Move the subdevice to the list of active (registered) subdevices | |
100 | * and associate it with a client. At the same time, associate the | |
101 | * client with its parent device. | |
102 | */ | |
103 | mutex_lock(&device->subdevs_lock); | |
104 | mutex_lock(&device->clients_lock); | |
105 | list_move_tail(&client->list, &device->clients); | |
106 | list_move_tail(&subdev->list, &device->active); | |
107 | client->parent = &device->dev; | |
108 | subdev->client = client; | |
109 | mutex_unlock(&device->clients_lock); | |
110 | mutex_unlock(&device->subdevs_lock); | |
111 | ||
112 | /* | |
113 | * When all subdevices have been registered, the composite device is | |
114 | * ready to be probed. | |
115 | */ | |
116 | if (list_empty(&device->subdevs)) { | |
117 | err = device->driver->probe(device); | |
118 | if (err < 0) | |
119 | dev_err(&device->dev, "probe failed: %d\n", err); | |
120 | } | |
121 | } | |
122 | ||
123 | static void __host1x_subdev_unregister(struct host1x_device *device, | |
124 | struct host1x_subdev *subdev) | |
125 | { | |
126 | struct host1x_client *client = subdev->client; | |
127 | int err; | |
128 | ||
129 | /* | |
130 | * If all subdevices have been activated, we're about to remove the | |
131 | * first active subdevice, so unload the driver first. | |
132 | */ | |
133 | if (list_empty(&device->subdevs)) { | |
134 | err = device->driver->remove(device); | |
135 | if (err < 0) | |
136 | dev_err(&device->dev, "remove failed: %d\n", err); | |
137 | } | |
138 | ||
139 | /* | |
140 | * Move the subdevice back to the list of idle subdevices and remove | |
141 | * it from list of clients. | |
142 | */ | |
143 | mutex_lock(&device->clients_lock); | |
144 | subdev->client = NULL; | |
145 | client->parent = NULL; | |
146 | list_move_tail(&subdev->list, &device->subdevs); | |
147 | /* | |
148 | * XXX: Perhaps don't do this here, but rather explicitly remove it | |
149 | * when the device is about to be deleted. | |
150 | * | |
151 | * This is somewhat complicated by the fact that this function is | |
152 | * used to remove the subdevice when a client is unregistered but | |
153 | * also when the composite device is about to be removed. | |
154 | */ | |
155 | list_del_init(&client->list); | |
156 | mutex_unlock(&device->clients_lock); | |
157 | } | |
158 | ||
159 | static void host1x_subdev_unregister(struct host1x_device *device, | |
160 | struct host1x_subdev *subdev) | |
161 | { | |
162 | mutex_lock(&device->subdevs_lock); | |
163 | __host1x_subdev_unregister(device, subdev); | |
164 | mutex_unlock(&device->subdevs_lock); | |
165 | } | |
166 | ||
167 | int host1x_device_init(struct host1x_device *device) | |
168 | { | |
169 | struct host1x_client *client; | |
170 | int err; | |
171 | ||
172 | mutex_lock(&device->clients_lock); | |
173 | ||
174 | list_for_each_entry(client, &device->clients, list) { | |
175 | if (client->ops && client->ops->init) { | |
176 | err = client->ops->init(client); | |
177 | if (err < 0) { | |
178 | dev_err(&device->dev, | |
179 | "failed to initialize %s: %d\n", | |
180 | dev_name(client->dev), err); | |
181 | mutex_unlock(&device->clients_lock); | |
182 | return err; | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | mutex_unlock(&device->clients_lock); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
192 | int host1x_device_exit(struct host1x_device *device) | |
193 | { | |
194 | struct host1x_client *client; | |
195 | int err; | |
196 | ||
197 | mutex_lock(&device->clients_lock); | |
198 | ||
199 | list_for_each_entry_reverse(client, &device->clients, list) { | |
200 | if (client->ops && client->ops->exit) { | |
201 | err = client->ops->exit(client); | |
202 | if (err < 0) { | |
203 | dev_err(&device->dev, | |
204 | "failed to cleanup %s: %d\n", | |
205 | dev_name(client->dev), err); | |
206 | mutex_unlock(&device->clients_lock); | |
207 | return err; | |
208 | } | |
209 | } | |
210 | } | |
211 | ||
212 | mutex_unlock(&device->clients_lock); | |
213 | ||
214 | return 0; | |
215 | } | |
216 | ||
217 | static int host1x_register_client(struct host1x *host1x, | |
218 | struct host1x_client *client) | |
219 | { | |
220 | struct host1x_device *device; | |
221 | struct host1x_subdev *subdev; | |
222 | ||
223 | mutex_lock(&host1x->devices_lock); | |
224 | ||
225 | list_for_each_entry(device, &host1x->devices, list) { | |
226 | list_for_each_entry(subdev, &device->subdevs, list) { | |
227 | if (subdev->np == client->dev->of_node) { | |
228 | host1x_subdev_register(device, subdev, client); | |
229 | mutex_unlock(&host1x->devices_lock); | |
230 | return 0; | |
231 | } | |
232 | } | |
233 | } | |
234 | ||
235 | mutex_unlock(&host1x->devices_lock); | |
236 | return -ENODEV; | |
237 | } | |
238 | ||
239 | static int host1x_unregister_client(struct host1x *host1x, | |
240 | struct host1x_client *client) | |
241 | { | |
242 | struct host1x_device *device, *dt; | |
243 | struct host1x_subdev *subdev; | |
244 | ||
245 | mutex_lock(&host1x->devices_lock); | |
246 | ||
247 | list_for_each_entry_safe(device, dt, &host1x->devices, list) { | |
248 | list_for_each_entry(subdev, &device->active, list) { | |
249 | if (subdev->client == client) { | |
250 | host1x_subdev_unregister(device, subdev); | |
251 | mutex_unlock(&host1x->devices_lock); | |
252 | return 0; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
257 | mutex_unlock(&host1x->devices_lock); | |
258 | return -ENODEV; | |
259 | } | |
260 | ||
d24b2898 | 261 | static struct bus_type host1x_bus_type = { |
776dc384 TR |
262 | .name = "host1x", |
263 | }; | |
264 | ||
265 | int host1x_bus_init(void) | |
266 | { | |
267 | return bus_register(&host1x_bus_type); | |
268 | } | |
269 | ||
270 | void host1x_bus_exit(void) | |
271 | { | |
272 | bus_unregister(&host1x_bus_type); | |
273 | } | |
274 | ||
275 | static void host1x_device_release(struct device *dev) | |
276 | { | |
277 | struct host1x_device *device = to_host1x_device(dev); | |
278 | ||
279 | kfree(device); | |
280 | } | |
281 | ||
282 | static int host1x_device_add(struct host1x *host1x, | |
283 | struct host1x_driver *driver) | |
284 | { | |
285 | struct host1x_client *client, *tmp; | |
286 | struct host1x_subdev *subdev; | |
287 | struct host1x_device *device; | |
288 | int err; | |
289 | ||
290 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
291 | if (!device) | |
292 | return -ENOMEM; | |
293 | ||
294 | mutex_init(&device->subdevs_lock); | |
295 | INIT_LIST_HEAD(&device->subdevs); | |
296 | INIT_LIST_HEAD(&device->active); | |
297 | mutex_init(&device->clients_lock); | |
298 | INIT_LIST_HEAD(&device->clients); | |
299 | INIT_LIST_HEAD(&device->list); | |
300 | device->driver = driver; | |
301 | ||
302 | device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask; | |
303 | device->dev.dma_mask = &device->dev.coherent_dma_mask; | |
304 | device->dev.release = host1x_device_release; | |
d24b2898 | 305 | dev_set_name(&device->dev, "%s", driver->name); |
776dc384 TR |
306 | device->dev.bus = &host1x_bus_type; |
307 | device->dev.parent = host1x->dev; | |
308 | ||
309 | err = device_register(&device->dev); | |
310 | if (err < 0) | |
311 | return err; | |
312 | ||
313 | err = host1x_device_parse_dt(device); | |
314 | if (err < 0) { | |
315 | device_unregister(&device->dev); | |
316 | return err; | |
317 | } | |
318 | ||
319 | mutex_lock(&host1x->devices_lock); | |
320 | list_add_tail(&device->list, &host1x->devices); | |
321 | mutex_unlock(&host1x->devices_lock); | |
322 | ||
323 | mutex_lock(&clients_lock); | |
324 | ||
325 | list_for_each_entry_safe(client, tmp, &clients, list) { | |
326 | list_for_each_entry(subdev, &device->subdevs, list) { | |
327 | if (subdev->np == client->dev->of_node) { | |
328 | host1x_subdev_register(device, subdev, client); | |
329 | break; | |
330 | } | |
331 | } | |
332 | } | |
333 | ||
334 | mutex_unlock(&clients_lock); | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | /* | |
340 | * Removes a device by first unregistering any subdevices and then removing | |
341 | * itself from the list of devices. | |
342 | * | |
343 | * This function must be called with the host1x->devices_lock held. | |
344 | */ | |
345 | static void host1x_device_del(struct host1x *host1x, | |
346 | struct host1x_device *device) | |
347 | { | |
348 | struct host1x_subdev *subdev, *sd; | |
349 | struct host1x_client *client, *cl; | |
350 | ||
351 | mutex_lock(&device->subdevs_lock); | |
352 | ||
353 | /* unregister subdevices */ | |
354 | list_for_each_entry_safe(subdev, sd, &device->active, list) { | |
355 | /* | |
356 | * host1x_subdev_unregister() will remove the client from | |
357 | * any lists, so we'll need to manually add it back to the | |
358 | * list of idle clients. | |
359 | * | |
360 | * XXX: Alternatively, perhaps don't remove the client from | |
361 | * any lists in host1x_subdev_unregister() and instead do | |
362 | * that explicitly from host1x_unregister_client()? | |
363 | */ | |
364 | client = subdev->client; | |
365 | ||
366 | __host1x_subdev_unregister(device, subdev); | |
367 | ||
368 | /* add the client to the list of idle clients */ | |
369 | mutex_lock(&clients_lock); | |
370 | list_add_tail(&client->list, &clients); | |
371 | mutex_unlock(&clients_lock); | |
372 | } | |
373 | ||
374 | /* remove subdevices */ | |
375 | list_for_each_entry_safe(subdev, sd, &device->subdevs, list) | |
376 | host1x_subdev_del(subdev); | |
377 | ||
378 | mutex_unlock(&device->subdevs_lock); | |
379 | ||
380 | /* move clients to idle list */ | |
381 | mutex_lock(&clients_lock); | |
382 | mutex_lock(&device->clients_lock); | |
383 | ||
384 | list_for_each_entry_safe(client, cl, &device->clients, list) | |
385 | list_move_tail(&client->list, &clients); | |
386 | ||
387 | mutex_unlock(&device->clients_lock); | |
388 | mutex_unlock(&clients_lock); | |
389 | ||
390 | /* finally remove the device */ | |
391 | list_del_init(&device->list); | |
392 | device_unregister(&device->dev); | |
393 | } | |
394 | ||
395 | static void host1x_attach_driver(struct host1x *host1x, | |
396 | struct host1x_driver *driver) | |
397 | { | |
398 | struct host1x_device *device; | |
399 | int err; | |
400 | ||
401 | mutex_lock(&host1x->devices_lock); | |
402 | ||
403 | list_for_each_entry(device, &host1x->devices, list) { | |
404 | if (device->driver == driver) { | |
405 | mutex_unlock(&host1x->devices_lock); | |
406 | return; | |
407 | } | |
408 | } | |
409 | ||
410 | mutex_unlock(&host1x->devices_lock); | |
411 | ||
412 | err = host1x_device_add(host1x, driver); | |
413 | if (err < 0) | |
414 | dev_err(host1x->dev, "failed to allocate device: %d\n", err); | |
415 | } | |
416 | ||
417 | static void host1x_detach_driver(struct host1x *host1x, | |
418 | struct host1x_driver *driver) | |
419 | { | |
420 | struct host1x_device *device, *tmp; | |
421 | ||
422 | mutex_lock(&host1x->devices_lock); | |
423 | ||
424 | list_for_each_entry_safe(device, tmp, &host1x->devices, list) | |
425 | if (device->driver == driver) | |
426 | host1x_device_del(host1x, device); | |
427 | ||
428 | mutex_unlock(&host1x->devices_lock); | |
429 | } | |
430 | ||
431 | int host1x_register(struct host1x *host1x) | |
432 | { | |
433 | struct host1x_driver *driver; | |
434 | ||
435 | mutex_lock(&devices_lock); | |
436 | list_add_tail(&host1x->list, &devices); | |
437 | mutex_unlock(&devices_lock); | |
438 | ||
439 | mutex_lock(&drivers_lock); | |
440 | ||
441 | list_for_each_entry(driver, &drivers, list) | |
442 | host1x_attach_driver(host1x, driver); | |
443 | ||
444 | mutex_unlock(&drivers_lock); | |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
449 | int host1x_unregister(struct host1x *host1x) | |
450 | { | |
451 | struct host1x_driver *driver; | |
452 | ||
453 | mutex_lock(&drivers_lock); | |
454 | ||
455 | list_for_each_entry(driver, &drivers, list) | |
456 | host1x_detach_driver(host1x, driver); | |
457 | ||
458 | mutex_unlock(&drivers_lock); | |
459 | ||
460 | mutex_lock(&devices_lock); | |
461 | list_del_init(&host1x->list); | |
462 | mutex_unlock(&devices_lock); | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | int host1x_driver_register(struct host1x_driver *driver) | |
468 | { | |
469 | struct host1x *host1x; | |
470 | ||
471 | INIT_LIST_HEAD(&driver->list); | |
472 | ||
473 | mutex_lock(&drivers_lock); | |
474 | list_add_tail(&driver->list, &drivers); | |
475 | mutex_unlock(&drivers_lock); | |
476 | ||
477 | mutex_lock(&devices_lock); | |
478 | ||
479 | list_for_each_entry(host1x, &devices, list) | |
480 | host1x_attach_driver(host1x, driver); | |
481 | ||
482 | mutex_unlock(&devices_lock); | |
483 | ||
484 | return 0; | |
485 | } | |
486 | EXPORT_SYMBOL(host1x_driver_register); | |
487 | ||
488 | void host1x_driver_unregister(struct host1x_driver *driver) | |
489 | { | |
490 | mutex_lock(&drivers_lock); | |
491 | list_del_init(&driver->list); | |
492 | mutex_unlock(&drivers_lock); | |
493 | } | |
494 | EXPORT_SYMBOL(host1x_driver_unregister); | |
495 | ||
496 | int host1x_client_register(struct host1x_client *client) | |
497 | { | |
498 | struct host1x *host1x; | |
499 | int err; | |
500 | ||
501 | mutex_lock(&devices_lock); | |
502 | ||
503 | list_for_each_entry(host1x, &devices, list) { | |
504 | err = host1x_register_client(host1x, client); | |
505 | if (!err) { | |
506 | mutex_unlock(&devices_lock); | |
507 | return 0; | |
508 | } | |
509 | } | |
510 | ||
511 | mutex_unlock(&devices_lock); | |
512 | ||
513 | mutex_lock(&clients_lock); | |
514 | list_add_tail(&client->list, &clients); | |
515 | mutex_unlock(&clients_lock); | |
516 | ||
517 | return 0; | |
518 | } | |
519 | EXPORT_SYMBOL(host1x_client_register); | |
520 | ||
521 | int host1x_client_unregister(struct host1x_client *client) | |
522 | { | |
523 | struct host1x_client *c; | |
524 | struct host1x *host1x; | |
525 | int err; | |
526 | ||
527 | mutex_lock(&devices_lock); | |
528 | ||
529 | list_for_each_entry(host1x, &devices, list) { | |
530 | err = host1x_unregister_client(host1x, client); | |
531 | if (!err) { | |
532 | mutex_unlock(&devices_lock); | |
533 | return 0; | |
534 | } | |
535 | } | |
536 | ||
537 | mutex_unlock(&devices_lock); | |
538 | mutex_lock(&clients_lock); | |
539 | ||
540 | list_for_each_entry(c, &clients, list) { | |
541 | if (c == client) { | |
542 | list_del_init(&c->list); | |
543 | break; | |
544 | } | |
545 | } | |
546 | ||
547 | mutex_unlock(&clients_lock); | |
548 | ||
549 | return 0; | |
550 | } | |
551 | EXPORT_SYMBOL(host1x_client_unregister); |