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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 | } | |
fae798a1 | 191 | EXPORT_SYMBOL(host1x_device_init); |
776dc384 TR |
192 | |
193 | int host1x_device_exit(struct host1x_device *device) | |
194 | { | |
195 | struct host1x_client *client; | |
196 | int err; | |
197 | ||
198 | mutex_lock(&device->clients_lock); | |
199 | ||
200 | list_for_each_entry_reverse(client, &device->clients, list) { | |
201 | if (client->ops && client->ops->exit) { | |
202 | err = client->ops->exit(client); | |
203 | if (err < 0) { | |
204 | dev_err(&device->dev, | |
205 | "failed to cleanup %s: %d\n", | |
206 | dev_name(client->dev), err); | |
207 | mutex_unlock(&device->clients_lock); | |
208 | return err; | |
209 | } | |
210 | } | |
211 | } | |
212 | ||
213 | mutex_unlock(&device->clients_lock); | |
214 | ||
215 | return 0; | |
216 | } | |
fae798a1 | 217 | EXPORT_SYMBOL(host1x_device_exit); |
776dc384 TR |
218 | |
219 | static int host1x_register_client(struct host1x *host1x, | |
220 | struct host1x_client *client) | |
221 | { | |
222 | struct host1x_device *device; | |
223 | struct host1x_subdev *subdev; | |
224 | ||
225 | mutex_lock(&host1x->devices_lock); | |
226 | ||
227 | list_for_each_entry(device, &host1x->devices, list) { | |
228 | list_for_each_entry(subdev, &device->subdevs, list) { | |
229 | if (subdev->np == client->dev->of_node) { | |
230 | host1x_subdev_register(device, subdev, client); | |
231 | mutex_unlock(&host1x->devices_lock); | |
232 | return 0; | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | mutex_unlock(&host1x->devices_lock); | |
238 | return -ENODEV; | |
239 | } | |
240 | ||
241 | static int host1x_unregister_client(struct host1x *host1x, | |
242 | struct host1x_client *client) | |
243 | { | |
244 | struct host1x_device *device, *dt; | |
245 | struct host1x_subdev *subdev; | |
246 | ||
247 | mutex_lock(&host1x->devices_lock); | |
248 | ||
249 | list_for_each_entry_safe(device, dt, &host1x->devices, list) { | |
250 | list_for_each_entry(subdev, &device->active, list) { | |
251 | if (subdev->client == client) { | |
252 | host1x_subdev_unregister(device, subdev); | |
253 | mutex_unlock(&host1x->devices_lock); | |
254 | return 0; | |
255 | } | |
256 | } | |
257 | } | |
258 | ||
259 | mutex_unlock(&host1x->devices_lock); | |
260 | return -ENODEV; | |
261 | } | |
262 | ||
d24b2898 | 263 | static struct bus_type host1x_bus_type = { |
776dc384 TR |
264 | .name = "host1x", |
265 | }; | |
266 | ||
267 | int host1x_bus_init(void) | |
268 | { | |
269 | return bus_register(&host1x_bus_type); | |
270 | } | |
271 | ||
272 | void host1x_bus_exit(void) | |
273 | { | |
274 | bus_unregister(&host1x_bus_type); | |
275 | } | |
276 | ||
277 | static void host1x_device_release(struct device *dev) | |
278 | { | |
279 | struct host1x_device *device = to_host1x_device(dev); | |
280 | ||
281 | kfree(device); | |
282 | } | |
283 | ||
284 | static int host1x_device_add(struct host1x *host1x, | |
285 | struct host1x_driver *driver) | |
286 | { | |
287 | struct host1x_client *client, *tmp; | |
288 | struct host1x_subdev *subdev; | |
289 | struct host1x_device *device; | |
290 | int err; | |
291 | ||
292 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
293 | if (!device) | |
294 | return -ENOMEM; | |
295 | ||
296 | mutex_init(&device->subdevs_lock); | |
297 | INIT_LIST_HEAD(&device->subdevs); | |
298 | INIT_LIST_HEAD(&device->active); | |
299 | mutex_init(&device->clients_lock); | |
300 | INIT_LIST_HEAD(&device->clients); | |
301 | INIT_LIST_HEAD(&device->list); | |
302 | device->driver = driver; | |
303 | ||
304 | device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask; | |
305 | device->dev.dma_mask = &device->dev.coherent_dma_mask; | |
306 | device->dev.release = host1x_device_release; | |
d24b2898 | 307 | dev_set_name(&device->dev, "%s", driver->name); |
776dc384 TR |
308 | device->dev.bus = &host1x_bus_type; |
309 | device->dev.parent = host1x->dev; | |
310 | ||
311 | err = device_register(&device->dev); | |
312 | if (err < 0) | |
313 | return err; | |
314 | ||
315 | err = host1x_device_parse_dt(device); | |
316 | if (err < 0) { | |
317 | device_unregister(&device->dev); | |
318 | return err; | |
319 | } | |
320 | ||
321 | mutex_lock(&host1x->devices_lock); | |
322 | list_add_tail(&device->list, &host1x->devices); | |
323 | mutex_unlock(&host1x->devices_lock); | |
324 | ||
325 | mutex_lock(&clients_lock); | |
326 | ||
327 | list_for_each_entry_safe(client, tmp, &clients, list) { | |
328 | list_for_each_entry(subdev, &device->subdevs, list) { | |
329 | if (subdev->np == client->dev->of_node) { | |
330 | host1x_subdev_register(device, subdev, client); | |
331 | break; | |
332 | } | |
333 | } | |
334 | } | |
335 | ||
336 | mutex_unlock(&clients_lock); | |
337 | ||
338 | return 0; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Removes a device by first unregistering any subdevices and then removing | |
343 | * itself from the list of devices. | |
344 | * | |
345 | * This function must be called with the host1x->devices_lock held. | |
346 | */ | |
347 | static void host1x_device_del(struct host1x *host1x, | |
348 | struct host1x_device *device) | |
349 | { | |
350 | struct host1x_subdev *subdev, *sd; | |
351 | struct host1x_client *client, *cl; | |
352 | ||
353 | mutex_lock(&device->subdevs_lock); | |
354 | ||
355 | /* unregister subdevices */ | |
356 | list_for_each_entry_safe(subdev, sd, &device->active, list) { | |
357 | /* | |
358 | * host1x_subdev_unregister() will remove the client from | |
359 | * any lists, so we'll need to manually add it back to the | |
360 | * list of idle clients. | |
361 | * | |
362 | * XXX: Alternatively, perhaps don't remove the client from | |
363 | * any lists in host1x_subdev_unregister() and instead do | |
364 | * that explicitly from host1x_unregister_client()? | |
365 | */ | |
366 | client = subdev->client; | |
367 | ||
368 | __host1x_subdev_unregister(device, subdev); | |
369 | ||
370 | /* add the client to the list of idle clients */ | |
371 | mutex_lock(&clients_lock); | |
372 | list_add_tail(&client->list, &clients); | |
373 | mutex_unlock(&clients_lock); | |
374 | } | |
375 | ||
376 | /* remove subdevices */ | |
377 | list_for_each_entry_safe(subdev, sd, &device->subdevs, list) | |
378 | host1x_subdev_del(subdev); | |
379 | ||
380 | mutex_unlock(&device->subdevs_lock); | |
381 | ||
382 | /* move clients to idle list */ | |
383 | mutex_lock(&clients_lock); | |
384 | mutex_lock(&device->clients_lock); | |
385 | ||
386 | list_for_each_entry_safe(client, cl, &device->clients, list) | |
387 | list_move_tail(&client->list, &clients); | |
388 | ||
389 | mutex_unlock(&device->clients_lock); | |
390 | mutex_unlock(&clients_lock); | |
391 | ||
392 | /* finally remove the device */ | |
393 | list_del_init(&device->list); | |
394 | device_unregister(&device->dev); | |
395 | } | |
396 | ||
397 | static void host1x_attach_driver(struct host1x *host1x, | |
398 | struct host1x_driver *driver) | |
399 | { | |
400 | struct host1x_device *device; | |
401 | int err; | |
402 | ||
403 | mutex_lock(&host1x->devices_lock); | |
404 | ||
405 | list_for_each_entry(device, &host1x->devices, list) { | |
406 | if (device->driver == driver) { | |
407 | mutex_unlock(&host1x->devices_lock); | |
408 | return; | |
409 | } | |
410 | } | |
411 | ||
412 | mutex_unlock(&host1x->devices_lock); | |
413 | ||
414 | err = host1x_device_add(host1x, driver); | |
415 | if (err < 0) | |
416 | dev_err(host1x->dev, "failed to allocate device: %d\n", err); | |
417 | } | |
418 | ||
419 | static void host1x_detach_driver(struct host1x *host1x, | |
420 | struct host1x_driver *driver) | |
421 | { | |
422 | struct host1x_device *device, *tmp; | |
423 | ||
424 | mutex_lock(&host1x->devices_lock); | |
425 | ||
426 | list_for_each_entry_safe(device, tmp, &host1x->devices, list) | |
427 | if (device->driver == driver) | |
428 | host1x_device_del(host1x, device); | |
429 | ||
430 | mutex_unlock(&host1x->devices_lock); | |
431 | } | |
432 | ||
433 | int host1x_register(struct host1x *host1x) | |
434 | { | |
435 | struct host1x_driver *driver; | |
436 | ||
437 | mutex_lock(&devices_lock); | |
438 | list_add_tail(&host1x->list, &devices); | |
439 | mutex_unlock(&devices_lock); | |
440 | ||
441 | mutex_lock(&drivers_lock); | |
442 | ||
443 | list_for_each_entry(driver, &drivers, list) | |
444 | host1x_attach_driver(host1x, driver); | |
445 | ||
446 | mutex_unlock(&drivers_lock); | |
447 | ||
448 | return 0; | |
449 | } | |
450 | ||
451 | int host1x_unregister(struct host1x *host1x) | |
452 | { | |
453 | struct host1x_driver *driver; | |
454 | ||
455 | mutex_lock(&drivers_lock); | |
456 | ||
457 | list_for_each_entry(driver, &drivers, list) | |
458 | host1x_detach_driver(host1x, driver); | |
459 | ||
460 | mutex_unlock(&drivers_lock); | |
461 | ||
462 | mutex_lock(&devices_lock); | |
463 | list_del_init(&host1x->list); | |
464 | mutex_unlock(&devices_lock); | |
465 | ||
466 | return 0; | |
467 | } | |
468 | ||
469 | int host1x_driver_register(struct host1x_driver *driver) | |
470 | { | |
471 | struct host1x *host1x; | |
472 | ||
473 | INIT_LIST_HEAD(&driver->list); | |
474 | ||
475 | mutex_lock(&drivers_lock); | |
476 | list_add_tail(&driver->list, &drivers); | |
477 | mutex_unlock(&drivers_lock); | |
478 | ||
479 | mutex_lock(&devices_lock); | |
480 | ||
481 | list_for_each_entry(host1x, &devices, list) | |
482 | host1x_attach_driver(host1x, driver); | |
483 | ||
484 | mutex_unlock(&devices_lock); | |
485 | ||
486 | return 0; | |
487 | } | |
488 | EXPORT_SYMBOL(host1x_driver_register); | |
489 | ||
490 | void host1x_driver_unregister(struct host1x_driver *driver) | |
491 | { | |
492 | mutex_lock(&drivers_lock); | |
493 | list_del_init(&driver->list); | |
494 | mutex_unlock(&drivers_lock); | |
495 | } | |
496 | EXPORT_SYMBOL(host1x_driver_unregister); | |
497 | ||
498 | int host1x_client_register(struct host1x_client *client) | |
499 | { | |
500 | struct host1x *host1x; | |
501 | int err; | |
502 | ||
503 | mutex_lock(&devices_lock); | |
504 | ||
505 | list_for_each_entry(host1x, &devices, list) { | |
506 | err = host1x_register_client(host1x, client); | |
507 | if (!err) { | |
508 | mutex_unlock(&devices_lock); | |
509 | return 0; | |
510 | } | |
511 | } | |
512 | ||
513 | mutex_unlock(&devices_lock); | |
514 | ||
515 | mutex_lock(&clients_lock); | |
516 | list_add_tail(&client->list, &clients); | |
517 | mutex_unlock(&clients_lock); | |
518 | ||
519 | return 0; | |
520 | } | |
521 | EXPORT_SYMBOL(host1x_client_register); | |
522 | ||
523 | int host1x_client_unregister(struct host1x_client *client) | |
524 | { | |
525 | struct host1x_client *c; | |
526 | struct host1x *host1x; | |
527 | int err; | |
528 | ||
529 | mutex_lock(&devices_lock); | |
530 | ||
531 | list_for_each_entry(host1x, &devices, list) { | |
532 | err = host1x_unregister_client(host1x, client); | |
533 | if (!err) { | |
534 | mutex_unlock(&devices_lock); | |
535 | return 0; | |
536 | } | |
537 | } | |
538 | ||
539 | mutex_unlock(&devices_lock); | |
540 | mutex_lock(&clients_lock); | |
541 | ||
542 | list_for_each_entry(c, &clients, list) { | |
543 | if (c == client) { | |
544 | list_del_init(&c->list); | |
545 | break; | |
546 | } | |
547 | } | |
548 | ||
549 | mutex_unlock(&clients_lock); | |
550 | ||
551 | return 0; | |
552 | } | |
553 | EXPORT_SYMBOL(host1x_client_unregister); |