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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#include <linux/of_device.h>
22
23#include "bus.h"
24#include "dev.h"
25
26static DEFINE_MUTEX(clients_lock);
27static LIST_HEAD(clients);
28
29static DEFINE_MUTEX(drivers_lock);
30static LIST_HEAD(drivers);
31
32static DEFINE_MUTEX(devices_lock);
33static LIST_HEAD(devices);
34
35struct 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 */
44static 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 */
66static 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 */
76static int host1x_device_parse_dt(struct host1x_device *device,
77 struct host1x_driver *driver)
78{
79 struct device_node *np;
80 int err;
81
82 for_each_child_of_node(device->dev.parent->of_node, np) {
83 if (of_match_node(driver->subdevs, np) &&
84 of_device_is_available(np)) {
85 err = host1x_subdev_add(device, np);
86 if (err < 0) {
87 of_node_put(np);
88 return err;
89 }
90 }
91 }
92
93 return 0;
94}
95
96static void host1x_subdev_register(struct host1x_device *device,
97 struct host1x_subdev *subdev,
98 struct host1x_client *client)
99{
100 int err;
101
102 /*
103 * Move the subdevice to the list of active (registered) subdevices
104 * and associate it with a client. At the same time, associate the
105 * client with its parent device.
106 */
107 mutex_lock(&device->subdevs_lock);
108 mutex_lock(&device->clients_lock);
109 list_move_tail(&client->list, &device->clients);
110 list_move_tail(&subdev->list, &device->active);
111 client->parent = &device->dev;
112 subdev->client = client;
113 mutex_unlock(&device->clients_lock);
114 mutex_unlock(&device->subdevs_lock);
115
116 if (list_empty(&device->subdevs)) {
117 err = device_add(&device->dev);
118 if (err < 0)
119 dev_err(&device->dev, "failed to add: %d\n", err);
120 else
121 device->registered = true;
122 }
123}
124
125static void __host1x_subdev_unregister(struct host1x_device *device,
126 struct host1x_subdev *subdev)
127{
128 struct host1x_client *client = subdev->client;
129
130 /*
131 * If all subdevices have been activated, we're about to remove the
132 * first active subdevice, so unload the driver first.
133 */
134 if (list_empty(&device->subdevs)) {
135 if (device->registered) {
136 device->registered = false;
137 device_del(&device->dev);
138 }
139 }
140
141 /*
142 * Move the subdevice back to the list of idle subdevices and remove
143 * it from list of clients.
144 */
145 mutex_lock(&device->clients_lock);
146 subdev->client = NULL;
147 client->parent = NULL;
148 list_move_tail(&subdev->list, &device->subdevs);
149 /*
150 * XXX: Perhaps don't do this here, but rather explicitly remove it
151 * when the device is about to be deleted.
152 *
153 * This is somewhat complicated by the fact that this function is
154 * used to remove the subdevice when a client is unregistered but
155 * also when the composite device is about to be removed.
156 */
157 list_del_init(&client->list);
158 mutex_unlock(&device->clients_lock);
159}
160
161static void host1x_subdev_unregister(struct host1x_device *device,
162 struct host1x_subdev *subdev)
163{
164 mutex_lock(&device->subdevs_lock);
165 __host1x_subdev_unregister(device, subdev);
166 mutex_unlock(&device->subdevs_lock);
167}
168
169int host1x_device_init(struct host1x_device *device)
170{
171 struct host1x_client *client;
172 int err;
173
174 mutex_lock(&device->clients_lock);
175
176 list_for_each_entry(client, &device->clients, list) {
177 if (client->ops && client->ops->init) {
178 err = client->ops->init(client);
179 if (err < 0) {
180 dev_err(&device->dev,
181 "failed to initialize %s: %d\n",
182 dev_name(client->dev), err);
183 mutex_unlock(&device->clients_lock);
184 return err;
185 }
186 }
187 }
188
189 mutex_unlock(&device->clients_lock);
190
191 return 0;
192}
193EXPORT_SYMBOL(host1x_device_init);
194
195int host1x_device_exit(struct host1x_device *device)
196{
197 struct host1x_client *client;
198 int err;
199
200 mutex_lock(&device->clients_lock);
201
202 list_for_each_entry_reverse(client, &device->clients, list) {
203 if (client->ops && client->ops->exit) {
204 err = client->ops->exit(client);
205 if (err < 0) {
206 dev_err(&device->dev,
207 "failed to cleanup %s: %d\n",
208 dev_name(client->dev), err);
209 mutex_unlock(&device->clients_lock);
210 return err;
211 }
212 }
213 }
214
215 mutex_unlock(&device->clients_lock);
216
217 return 0;
218}
219EXPORT_SYMBOL(host1x_device_exit);
220
221static int host1x_add_client(struct host1x *host1x,
222 struct host1x_client *client)
223{
224 struct host1x_device *device;
225 struct host1x_subdev *subdev;
226
227 mutex_lock(&host1x->devices_lock);
228
229 list_for_each_entry(device, &host1x->devices, list) {
230 list_for_each_entry(subdev, &device->subdevs, list) {
231 if (subdev->np == client->dev->of_node) {
232 host1x_subdev_register(device, subdev, client);
233 mutex_unlock(&host1x->devices_lock);
234 return 0;
235 }
236 }
237 }
238
239 mutex_unlock(&host1x->devices_lock);
240 return -ENODEV;
241}
242
243static int host1x_del_client(struct host1x *host1x,
244 struct host1x_client *client)
245{
246 struct host1x_device *device, *dt;
247 struct host1x_subdev *subdev;
248
249 mutex_lock(&host1x->devices_lock);
250
251 list_for_each_entry_safe(device, dt, &host1x->devices, list) {
252 list_for_each_entry(subdev, &device->active, list) {
253 if (subdev->client == client) {
254 host1x_subdev_unregister(device, subdev);
255 mutex_unlock(&host1x->devices_lock);
256 return 0;
257 }
258 }
259 }
260
261 mutex_unlock(&host1x->devices_lock);
262 return -ENODEV;
263}
264
265static int host1x_device_match(struct device *dev, struct device_driver *drv)
266{
267 return strcmp(dev_name(dev), drv->name) == 0;
268}
269
270static int host1x_device_probe(struct device *dev)
271{
272 struct host1x_driver *driver = to_host1x_driver(dev->driver);
273 struct host1x_device *device = to_host1x_device(dev);
274
275 if (driver->probe)
276 return driver->probe(device);
277
278 return 0;
279}
280
281static int host1x_device_remove(struct device *dev)
282{
283 struct host1x_driver *driver = to_host1x_driver(dev->driver);
284 struct host1x_device *device = to_host1x_device(dev);
285
286 if (driver->remove)
287 return driver->remove(device);
288
289 return 0;
290}
291
292static void host1x_device_shutdown(struct device *dev)
293{
294 struct host1x_driver *driver = to_host1x_driver(dev->driver);
295 struct host1x_device *device = to_host1x_device(dev);
296
297 if (driver->shutdown)
298 driver->shutdown(device);
299}
300
301static const struct dev_pm_ops host1x_device_pm_ops = {
302 .suspend = pm_generic_suspend,
303 .resume = pm_generic_resume,
304 .freeze = pm_generic_freeze,
305 .thaw = pm_generic_thaw,
306 .poweroff = pm_generic_poweroff,
307 .restore = pm_generic_restore,
308};
309
310struct bus_type host1x_bus_type = {
311 .name = "host1x",
312 .match = host1x_device_match,
313 .probe = host1x_device_probe,
314 .remove = host1x_device_remove,
315 .shutdown = host1x_device_shutdown,
316 .pm = &host1x_device_pm_ops,
317};
318
319static void __host1x_device_del(struct host1x_device *device)
320{
321 struct host1x_subdev *subdev, *sd;
322 struct host1x_client *client, *cl;
323
324 mutex_lock(&device->subdevs_lock);
325
326 /* unregister subdevices */
327 list_for_each_entry_safe(subdev, sd, &device->active, list) {
328 /*
329 * host1x_subdev_unregister() will remove the client from
330 * any lists, so we'll need to manually add it back to the
331 * list of idle clients.
332 *
333 * XXX: Alternatively, perhaps don't remove the client from
334 * any lists in host1x_subdev_unregister() and instead do
335 * that explicitly from host1x_unregister_client()?
336 */
337 client = subdev->client;
338
339 __host1x_subdev_unregister(device, subdev);
340
341 /* add the client to the list of idle clients */
342 mutex_lock(&clients_lock);
343 list_add_tail(&client->list, &clients);
344 mutex_unlock(&clients_lock);
345 }
346
347 /* remove subdevices */
348 list_for_each_entry_safe(subdev, sd, &device->subdevs, list)
349 host1x_subdev_del(subdev);
350
351 mutex_unlock(&device->subdevs_lock);
352
353 /* move clients to idle list */
354 mutex_lock(&clients_lock);
355 mutex_lock(&device->clients_lock);
356
357 list_for_each_entry_safe(client, cl, &device->clients, list)
358 list_move_tail(&client->list, &clients);
359
360 mutex_unlock(&device->clients_lock);
361 mutex_unlock(&clients_lock);
362
363 /* finally remove the device */
364 list_del_init(&device->list);
365}
366
367static void host1x_device_release(struct device *dev)
368{
369 struct host1x_device *device = to_host1x_device(dev);
370
371 __host1x_device_del(device);
372 kfree(device);
373}
374
375static int host1x_device_add(struct host1x *host1x,
376 struct host1x_driver *driver)
377{
378 struct host1x_client *client, *tmp;
379 struct host1x_subdev *subdev;
380 struct host1x_device *device;
381 int err;
382
383 device = kzalloc(sizeof(*device), GFP_KERNEL);
384 if (!device)
385 return -ENOMEM;
386
387 device_initialize(&device->dev);
388
389 mutex_init(&device->subdevs_lock);
390 INIT_LIST_HEAD(&device->subdevs);
391 INIT_LIST_HEAD(&device->active);
392 mutex_init(&device->clients_lock);
393 INIT_LIST_HEAD(&device->clients);
394 INIT_LIST_HEAD(&device->list);
395 device->driver = driver;
396
397 device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask;
398 device->dev.dma_mask = &device->dev.coherent_dma_mask;
399 dev_set_name(&device->dev, "%s", driver->driver.name);
400 of_dma_configure(&device->dev, host1x->dev->of_node);
401 device->dev.release = host1x_device_release;
402 device->dev.bus = &host1x_bus_type;
403 device->dev.parent = host1x->dev;
404
405 err = host1x_device_parse_dt(device, driver);
406 if (err < 0) {
407 kfree(device);
408 return err;
409 }
410
411 list_add_tail(&device->list, &host1x->devices);
412
413 mutex_lock(&clients_lock);
414
415 list_for_each_entry_safe(client, tmp, &clients, list) {
416 list_for_each_entry(subdev, &device->subdevs, list) {
417 if (subdev->np == client->dev->of_node) {
418 host1x_subdev_register(device, subdev, client);
419 break;
420 }
421 }
422 }
423
424 mutex_unlock(&clients_lock);
425
426 return 0;
427}
428
429/*
430 * Removes a device by first unregistering any subdevices and then removing
431 * itself from the list of devices.
432 *
433 * This function must be called with the host1x->devices_lock held.
434 */
435static void host1x_device_del(struct host1x *host1x,
436 struct host1x_device *device)
437{
438 if (device->registered) {
439 device->registered = false;
440 device_del(&device->dev);
441 }
442
443 put_device(&device->dev);
444}
445
446static void host1x_attach_driver(struct host1x *host1x,
447 struct host1x_driver *driver)
448{
449 struct host1x_device *device;
450 int err;
451
452 mutex_lock(&host1x->devices_lock);
453
454 list_for_each_entry(device, &host1x->devices, list) {
455 if (device->driver == driver) {
456 mutex_unlock(&host1x->devices_lock);
457 return;
458 }
459 }
460
461 err = host1x_device_add(host1x, driver);
462 if (err < 0)
463 dev_err(host1x->dev, "failed to allocate device: %d\n", err);
464
465 mutex_unlock(&host1x->devices_lock);
466}
467
468static void host1x_detach_driver(struct host1x *host1x,
469 struct host1x_driver *driver)
470{
471 struct host1x_device *device, *tmp;
472
473 mutex_lock(&host1x->devices_lock);
474
475 list_for_each_entry_safe(device, tmp, &host1x->devices, list)
476 if (device->driver == driver)
477 host1x_device_del(host1x, device);
478
479 mutex_unlock(&host1x->devices_lock);
480}
481
482int host1x_register(struct host1x *host1x)
483{
484 struct host1x_driver *driver;
485
486 mutex_lock(&devices_lock);
487 list_add_tail(&host1x->list, &devices);
488 mutex_unlock(&devices_lock);
489
490 mutex_lock(&drivers_lock);
491
492 list_for_each_entry(driver, &drivers, list)
493 host1x_attach_driver(host1x, driver);
494
495 mutex_unlock(&drivers_lock);
496
497 return 0;
498}
499
500int host1x_unregister(struct host1x *host1x)
501{
502 struct host1x_driver *driver;
503
504 mutex_lock(&drivers_lock);
505
506 list_for_each_entry(driver, &drivers, list)
507 host1x_detach_driver(host1x, driver);
508
509 mutex_unlock(&drivers_lock);
510
511 mutex_lock(&devices_lock);
512 list_del_init(&host1x->list);
513 mutex_unlock(&devices_lock);
514
515 return 0;
516}
517
518int host1x_driver_register_full(struct host1x_driver *driver,
519 struct module *owner)
520{
521 struct host1x *host1x;
522
523 INIT_LIST_HEAD(&driver->list);
524
525 mutex_lock(&drivers_lock);
526 list_add_tail(&driver->list, &drivers);
527 mutex_unlock(&drivers_lock);
528
529 mutex_lock(&devices_lock);
530
531 list_for_each_entry(host1x, &devices, list)
532 host1x_attach_driver(host1x, driver);
533
534 mutex_unlock(&devices_lock);
535
536 driver->driver.bus = &host1x_bus_type;
537 driver->driver.owner = owner;
538
539 return driver_register(&driver->driver);
540}
541EXPORT_SYMBOL(host1x_driver_register_full);
542
543void host1x_driver_unregister(struct host1x_driver *driver)
544{
545 driver_unregister(&driver->driver);
546
547 mutex_lock(&drivers_lock);
548 list_del_init(&driver->list);
549 mutex_unlock(&drivers_lock);
550}
551EXPORT_SYMBOL(host1x_driver_unregister);
552
553int host1x_client_register(struct host1x_client *client)
554{
555 struct host1x *host1x;
556 int err;
557
558 mutex_lock(&devices_lock);
559
560 list_for_each_entry(host1x, &devices, list) {
561 err = host1x_add_client(host1x, client);
562 if (!err) {
563 mutex_unlock(&devices_lock);
564 return 0;
565 }
566 }
567
568 mutex_unlock(&devices_lock);
569
570 mutex_lock(&clients_lock);
571 list_add_tail(&client->list, &clients);
572 mutex_unlock(&clients_lock);
573
574 return 0;
575}
576EXPORT_SYMBOL(host1x_client_register);
577
578int host1x_client_unregister(struct host1x_client *client)
579{
580 struct host1x_client *c;
581 struct host1x *host1x;
582 int err;
583
584 mutex_lock(&devices_lock);
585
586 list_for_each_entry(host1x, &devices, list) {
587 err = host1x_del_client(host1x, client);
588 if (!err) {
589 mutex_unlock(&devices_lock);
590 return 0;
591 }
592 }
593
594 mutex_unlock(&devices_lock);
595 mutex_lock(&clients_lock);
596
597 list_for_each_entry(c, &clients, list) {
598 if (c == client) {
599 list_del_init(&c->list);
600 break;
601 }
602 }
603
604 mutex_unlock(&clients_lock);
605
606 return 0;
607}
608EXPORT_SYMBOL(host1x_client_unregister);