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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> | |
c95469aa | 21 | #include <linux/of_device.h> |
776dc384 | 22 | |
d24b2898 | 23 | #include "bus.h" |
776dc384 TR |
24 | #include "dev.h" |
25 | ||
26 | static DEFINE_MUTEX(clients_lock); | |
27 | static LIST_HEAD(clients); | |
28 | ||
29 | static DEFINE_MUTEX(drivers_lock); | |
30 | static LIST_HEAD(drivers); | |
31 | ||
32 | static DEFINE_MUTEX(devices_lock); | |
33 | static LIST_HEAD(devices); | |
34 | ||
35 | struct host1x_subdev { | |
36 | struct host1x_client *client; | |
37 | struct device_node *np; | |
38 | struct list_head list; | |
39 | }; | |
40 | ||
41 | /** | |
42 | * host1x_subdev_add() - add a new subdevice with an associated device node | |
43 | */ | |
44 | static int host1x_subdev_add(struct host1x_device *device, | |
45 | struct device_node *np) | |
46 | { | |
47 | struct host1x_subdev *subdev; | |
48 | ||
49 | subdev = kzalloc(sizeof(*subdev), GFP_KERNEL); | |
50 | if (!subdev) | |
51 | return -ENOMEM; | |
52 | ||
53 | INIT_LIST_HEAD(&subdev->list); | |
54 | subdev->np = of_node_get(np); | |
55 | ||
56 | mutex_lock(&device->subdevs_lock); | |
57 | list_add_tail(&subdev->list, &device->subdevs); | |
58 | mutex_unlock(&device->subdevs_lock); | |
59 | ||
60 | return 0; | |
61 | } | |
62 | ||
63 | /** | |
64 | * host1x_subdev_del() - remove subdevice | |
65 | */ | |
66 | static void host1x_subdev_del(struct host1x_subdev *subdev) | |
67 | { | |
68 | list_del(&subdev->list); | |
69 | of_node_put(subdev->np); | |
70 | kfree(subdev); | |
71 | } | |
72 | ||
73 | /** | |
74 | * host1x_device_parse_dt() - scan device tree and add matching subdevices | |
75 | */ | |
f4c5cf88 TR |
76 | static int host1x_device_parse_dt(struct host1x_device *device, |
77 | struct host1x_driver *driver) | |
776dc384 TR |
78 | { |
79 | struct device_node *np; | |
80 | int err; | |
81 | ||
82 | for_each_child_of_node(device->dev.parent->of_node, np) { | |
f4c5cf88 | 83 | if (of_match_node(driver->subdevs, np) && |
776dc384 TR |
84 | of_device_is_available(np)) { |
85 | err = host1x_subdev_add(device, np); | |
86 | if (err < 0) | |
87 | return err; | |
88 | } | |
89 | } | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static void host1x_subdev_register(struct host1x_device *device, | |
95 | struct host1x_subdev *subdev, | |
96 | struct host1x_client *client) | |
97 | { | |
98 | int err; | |
99 | ||
100 | /* | |
101 | * Move the subdevice to the list of active (registered) subdevices | |
102 | * and associate it with a client. At the same time, associate the | |
103 | * client with its parent device. | |
104 | */ | |
105 | mutex_lock(&device->subdevs_lock); | |
106 | mutex_lock(&device->clients_lock); | |
107 | list_move_tail(&client->list, &device->clients); | |
108 | list_move_tail(&subdev->list, &device->active); | |
109 | client->parent = &device->dev; | |
110 | subdev->client = client; | |
111 | mutex_unlock(&device->clients_lock); | |
112 | mutex_unlock(&device->subdevs_lock); | |
113 | ||
776dc384 | 114 | if (list_empty(&device->subdevs)) { |
f4c5cf88 | 115 | err = device_add(&device->dev); |
776dc384 | 116 | if (err < 0) |
f4c5cf88 | 117 | dev_err(&device->dev, "failed to add: %d\n", err); |
536e1715 | 118 | else |
f4c5cf88 | 119 | device->registered = true; |
776dc384 TR |
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; | |
776dc384 TR |
127 | |
128 | /* | |
129 | * If all subdevices have been activated, we're about to remove the | |
130 | * first active subdevice, so unload the driver first. | |
131 | */ | |
f4c5cf88 TR |
132 | if (list_empty(&device->subdevs)) { |
133 | if (device->registered) { | |
134 | device->registered = false; | |
135 | device_del(&device->dev); | |
136 | } | |
776dc384 TR |
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 | 218 | |
0c7dfd36 TR |
219 | static int host1x_add_client(struct host1x *host1x, |
220 | struct host1x_client *client) | |
776dc384 TR |
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 | ||
0c7dfd36 TR |
241 | static int host1x_del_client(struct host1x *host1x, |
242 | struct host1x_client *client) | |
776dc384 TR |
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 | ||
f4c5cf88 TR |
263 | static int host1x_device_match(struct device *dev, struct device_driver *drv) |
264 | { | |
265 | return strcmp(dev_name(dev), drv->name) == 0; | |
266 | } | |
776dc384 | 267 | |
f4c5cf88 | 268 | static int host1x_device_probe(struct device *dev) |
776dc384 | 269 | { |
f4c5cf88 TR |
270 | struct host1x_driver *driver = to_host1x_driver(dev->driver); |
271 | struct host1x_device *device = to_host1x_device(dev); | |
272 | ||
273 | if (driver->probe) | |
274 | return driver->probe(device); | |
275 | ||
276 | return 0; | |
776dc384 TR |
277 | } |
278 | ||
f4c5cf88 | 279 | static int host1x_device_remove(struct device *dev) |
776dc384 | 280 | { |
f4c5cf88 TR |
281 | struct host1x_driver *driver = to_host1x_driver(dev->driver); |
282 | struct host1x_device *device = to_host1x_device(dev); | |
283 | ||
284 | if (driver->remove) | |
285 | return driver->remove(device); | |
286 | ||
287 | return 0; | |
776dc384 TR |
288 | } |
289 | ||
f4c5cf88 TR |
290 | static void host1x_device_shutdown(struct device *dev) |
291 | { | |
292 | struct host1x_driver *driver = to_host1x_driver(dev->driver); | |
293 | struct host1x_device *device = to_host1x_device(dev); | |
294 | ||
295 | if (driver->shutdown) | |
296 | driver->shutdown(device); | |
297 | } | |
298 | ||
299 | static const struct dev_pm_ops host1x_device_pm_ops = { | |
300 | .suspend = pm_generic_suspend, | |
301 | .resume = pm_generic_resume, | |
302 | .freeze = pm_generic_freeze, | |
303 | .thaw = pm_generic_thaw, | |
304 | .poweroff = pm_generic_poweroff, | |
305 | .restore = pm_generic_restore, | |
306 | }; | |
307 | ||
308 | struct bus_type host1x_bus_type = { | |
309 | .name = "host1x", | |
310 | .match = host1x_device_match, | |
311 | .probe = host1x_device_probe, | |
312 | .remove = host1x_device_remove, | |
313 | .shutdown = host1x_device_shutdown, | |
314 | .pm = &host1x_device_pm_ops, | |
315 | }; | |
316 | ||
99d2cd81 TR |
317 | static void __host1x_device_del(struct host1x_device *device) |
318 | { | |
319 | struct host1x_subdev *subdev, *sd; | |
320 | struct host1x_client *client, *cl; | |
321 | ||
322 | mutex_lock(&device->subdevs_lock); | |
323 | ||
324 | /* unregister subdevices */ | |
325 | list_for_each_entry_safe(subdev, sd, &device->active, list) { | |
326 | /* | |
327 | * host1x_subdev_unregister() will remove the client from | |
328 | * any lists, so we'll need to manually add it back to the | |
329 | * list of idle clients. | |
330 | * | |
331 | * XXX: Alternatively, perhaps don't remove the client from | |
332 | * any lists in host1x_subdev_unregister() and instead do | |
333 | * that explicitly from host1x_unregister_client()? | |
334 | */ | |
335 | client = subdev->client; | |
336 | ||
337 | __host1x_subdev_unregister(device, subdev); | |
338 | ||
339 | /* add the client to the list of idle clients */ | |
340 | mutex_lock(&clients_lock); | |
341 | list_add_tail(&client->list, &clients); | |
342 | mutex_unlock(&clients_lock); | |
343 | } | |
344 | ||
345 | /* remove subdevices */ | |
346 | list_for_each_entry_safe(subdev, sd, &device->subdevs, list) | |
347 | host1x_subdev_del(subdev); | |
348 | ||
349 | mutex_unlock(&device->subdevs_lock); | |
350 | ||
351 | /* move clients to idle list */ | |
352 | mutex_lock(&clients_lock); | |
353 | mutex_lock(&device->clients_lock); | |
354 | ||
355 | list_for_each_entry_safe(client, cl, &device->clients, list) | |
356 | list_move_tail(&client->list, &clients); | |
357 | ||
358 | mutex_unlock(&device->clients_lock); | |
359 | mutex_unlock(&clients_lock); | |
360 | ||
361 | /* finally remove the device */ | |
362 | list_del_init(&device->list); | |
363 | } | |
364 | ||
776dc384 TR |
365 | static void host1x_device_release(struct device *dev) |
366 | { | |
367 | struct host1x_device *device = to_host1x_device(dev); | |
368 | ||
99d2cd81 | 369 | __host1x_device_del(device); |
776dc384 TR |
370 | kfree(device); |
371 | } | |
372 | ||
373 | static int host1x_device_add(struct host1x *host1x, | |
374 | struct host1x_driver *driver) | |
375 | { | |
376 | struct host1x_client *client, *tmp; | |
377 | struct host1x_subdev *subdev; | |
378 | struct host1x_device *device; | |
379 | int err; | |
380 | ||
381 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
382 | if (!device) | |
383 | return -ENOMEM; | |
384 | ||
f4c5cf88 TR |
385 | device_initialize(&device->dev); |
386 | ||
776dc384 TR |
387 | mutex_init(&device->subdevs_lock); |
388 | INIT_LIST_HEAD(&device->subdevs); | |
389 | INIT_LIST_HEAD(&device->active); | |
390 | mutex_init(&device->clients_lock); | |
391 | INIT_LIST_HEAD(&device->clients); | |
392 | INIT_LIST_HEAD(&device->list); | |
393 | device->driver = driver; | |
394 | ||
395 | device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask; | |
396 | device->dev.dma_mask = &device->dev.coherent_dma_mask; | |
f4c5cf88 | 397 | dev_set_name(&device->dev, "%s", driver->driver.name); |
c95469aa | 398 | of_dma_configure(&device->dev, host1x->dev->of_node); |
776dc384 | 399 | device->dev.release = host1x_device_release; |
776dc384 TR |
400 | device->dev.bus = &host1x_bus_type; |
401 | device->dev.parent = host1x->dev; | |
402 | ||
f4c5cf88 | 403 | err = host1x_device_parse_dt(device, driver); |
776dc384 | 404 | if (err < 0) { |
f4c5cf88 | 405 | kfree(device); |
776dc384 TR |
406 | return err; |
407 | } | |
408 | ||
776dc384 | 409 | list_add_tail(&device->list, &host1x->devices); |
776dc384 TR |
410 | |
411 | mutex_lock(&clients_lock); | |
412 | ||
413 | list_for_each_entry_safe(client, tmp, &clients, list) { | |
414 | list_for_each_entry(subdev, &device->subdevs, list) { | |
415 | if (subdev->np == client->dev->of_node) { | |
416 | host1x_subdev_register(device, subdev, client); | |
417 | break; | |
418 | } | |
419 | } | |
420 | } | |
421 | ||
422 | mutex_unlock(&clients_lock); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Removes a device by first unregistering any subdevices and then removing | |
429 | * itself from the list of devices. | |
430 | * | |
431 | * This function must be called with the host1x->devices_lock held. | |
432 | */ | |
433 | static void host1x_device_del(struct host1x *host1x, | |
434 | struct host1x_device *device) | |
435 | { | |
f4c5cf88 TR |
436 | if (device->registered) { |
437 | device->registered = false; | |
438 | device_del(&device->dev); | |
439 | } | |
440 | ||
441 | put_device(&device->dev); | |
776dc384 TR |
442 | } |
443 | ||
444 | static void host1x_attach_driver(struct host1x *host1x, | |
445 | struct host1x_driver *driver) | |
446 | { | |
447 | struct host1x_device *device; | |
448 | int err; | |
449 | ||
450 | mutex_lock(&host1x->devices_lock); | |
451 | ||
452 | list_for_each_entry(device, &host1x->devices, list) { | |
453 | if (device->driver == driver) { | |
454 | mutex_unlock(&host1x->devices_lock); | |
455 | return; | |
456 | } | |
457 | } | |
458 | ||
776dc384 TR |
459 | err = host1x_device_add(host1x, driver); |
460 | if (err < 0) | |
461 | dev_err(host1x->dev, "failed to allocate device: %d\n", err); | |
38d98de4 TR |
462 | |
463 | mutex_unlock(&host1x->devices_lock); | |
776dc384 TR |
464 | } |
465 | ||
466 | static void host1x_detach_driver(struct host1x *host1x, | |
467 | struct host1x_driver *driver) | |
468 | { | |
469 | struct host1x_device *device, *tmp; | |
470 | ||
471 | mutex_lock(&host1x->devices_lock); | |
472 | ||
473 | list_for_each_entry_safe(device, tmp, &host1x->devices, list) | |
474 | if (device->driver == driver) | |
475 | host1x_device_del(host1x, device); | |
476 | ||
477 | mutex_unlock(&host1x->devices_lock); | |
478 | } | |
479 | ||
480 | int host1x_register(struct host1x *host1x) | |
481 | { | |
482 | struct host1x_driver *driver; | |
483 | ||
484 | mutex_lock(&devices_lock); | |
485 | list_add_tail(&host1x->list, &devices); | |
486 | mutex_unlock(&devices_lock); | |
487 | ||
488 | mutex_lock(&drivers_lock); | |
489 | ||
490 | list_for_each_entry(driver, &drivers, list) | |
491 | host1x_attach_driver(host1x, driver); | |
492 | ||
493 | mutex_unlock(&drivers_lock); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | int host1x_unregister(struct host1x *host1x) | |
499 | { | |
500 | struct host1x_driver *driver; | |
501 | ||
502 | mutex_lock(&drivers_lock); | |
503 | ||
504 | list_for_each_entry(driver, &drivers, list) | |
505 | host1x_detach_driver(host1x, driver); | |
506 | ||
507 | mutex_unlock(&drivers_lock); | |
508 | ||
509 | mutex_lock(&devices_lock); | |
510 | list_del_init(&host1x->list); | |
511 | mutex_unlock(&devices_lock); | |
512 | ||
513 | return 0; | |
514 | } | |
515 | ||
f4c5cf88 TR |
516 | int host1x_driver_register_full(struct host1x_driver *driver, |
517 | struct module *owner) | |
776dc384 TR |
518 | { |
519 | struct host1x *host1x; | |
520 | ||
521 | INIT_LIST_HEAD(&driver->list); | |
522 | ||
523 | mutex_lock(&drivers_lock); | |
524 | list_add_tail(&driver->list, &drivers); | |
525 | mutex_unlock(&drivers_lock); | |
526 | ||
527 | mutex_lock(&devices_lock); | |
528 | ||
529 | list_for_each_entry(host1x, &devices, list) | |
530 | host1x_attach_driver(host1x, driver); | |
531 | ||
532 | mutex_unlock(&devices_lock); | |
533 | ||
f4c5cf88 TR |
534 | driver->driver.bus = &host1x_bus_type; |
535 | driver->driver.owner = owner; | |
536 | ||
537 | return driver_register(&driver->driver); | |
776dc384 | 538 | } |
f4c5cf88 | 539 | EXPORT_SYMBOL(host1x_driver_register_full); |
776dc384 TR |
540 | |
541 | void host1x_driver_unregister(struct host1x_driver *driver) | |
542 | { | |
e3e70814 TR |
543 | driver_unregister(&driver->driver); |
544 | ||
776dc384 TR |
545 | mutex_lock(&drivers_lock); |
546 | list_del_init(&driver->list); | |
547 | mutex_unlock(&drivers_lock); | |
548 | } | |
549 | EXPORT_SYMBOL(host1x_driver_unregister); | |
550 | ||
551 | int host1x_client_register(struct host1x_client *client) | |
552 | { | |
553 | struct host1x *host1x; | |
554 | int err; | |
555 | ||
556 | mutex_lock(&devices_lock); | |
557 | ||
558 | list_for_each_entry(host1x, &devices, list) { | |
0c7dfd36 | 559 | err = host1x_add_client(host1x, client); |
776dc384 TR |
560 | if (!err) { |
561 | mutex_unlock(&devices_lock); | |
562 | return 0; | |
563 | } | |
564 | } | |
565 | ||
566 | mutex_unlock(&devices_lock); | |
567 | ||
568 | mutex_lock(&clients_lock); | |
569 | list_add_tail(&client->list, &clients); | |
570 | mutex_unlock(&clients_lock); | |
571 | ||
572 | return 0; | |
573 | } | |
574 | EXPORT_SYMBOL(host1x_client_register); | |
575 | ||
576 | int host1x_client_unregister(struct host1x_client *client) | |
577 | { | |
578 | struct host1x_client *c; | |
579 | struct host1x *host1x; | |
580 | int err; | |
581 | ||
582 | mutex_lock(&devices_lock); | |
583 | ||
584 | list_for_each_entry(host1x, &devices, list) { | |
0c7dfd36 | 585 | err = host1x_del_client(host1x, client); |
776dc384 TR |
586 | if (!err) { |
587 | mutex_unlock(&devices_lock); | |
588 | return 0; | |
589 | } | |
590 | } | |
591 | ||
592 | mutex_unlock(&devices_lock); | |
593 | mutex_lock(&clients_lock); | |
594 | ||
595 | list_for_each_entry(c, &clients, list) { | |
596 | if (c == client) { | |
597 | list_del_init(&c->list); | |
598 | break; | |
599 | } | |
600 | } | |
601 | ||
602 | mutex_unlock(&clients_lock); | |
603 | ||
604 | return 0; | |
605 | } | |
606 | EXPORT_SYMBOL(host1x_client_unregister); |