blob: 2e57c9cea696e317ae67a5ee9a7eb2b512fb2cf7 [file] [log] [blame]
Thierry Reding776dc382013-10-14 14:43:22 +02001/*
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>
Alexandre Courbotc95469a2016-02-26 18:06:53 +090021#include <linux/of_device.h>
Thierry Reding776dc382013-10-14 14:43:22 +020022
Thierry Redingd24b2892013-11-08 13:20:23 +010023#include "bus.h"
Thierry Reding776dc382013-10-14 14:43:22 +020024#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
Thierry Reding466749f2017-04-10 12:27:01 +020043 * @device: host1x device to add the subdevice to
Thierry Reding466749f2017-04-10 12:27:01 +020044 * @np: device node
Thierry Reding776dc382013-10-14 14:43:22 +020045 */
46static int host1x_subdev_add(struct host1x_device *device,
Thierry Reding25ae30d2017-08-15 15:46:22 +020047 struct host1x_driver *driver,
Thierry Reding776dc382013-10-14 14:43:22 +020048 struct device_node *np)
49{
50 struct host1x_subdev *subdev;
Thierry Reding25ae30d2017-08-15 15:46:22 +020051 struct device_node *child;
52 int err;
Thierry Reding776dc382013-10-14 14:43:22 +020053
54 subdev = kzalloc(sizeof(*subdev), GFP_KERNEL);
55 if (!subdev)
56 return -ENOMEM;
57
58 INIT_LIST_HEAD(&subdev->list);
59 subdev->np = of_node_get(np);
60
61 mutex_lock(&device->subdevs_lock);
62 list_add_tail(&subdev->list, &device->subdevs);
63 mutex_unlock(&device->subdevs_lock);
64
Thierry Reding25ae30d2017-08-15 15:46:22 +020065 /* recursively add children */
66 for_each_child_of_node(np, child) {
67 if (of_match_node(driver->subdevs, child) &&
68 of_device_is_available(child)) {
69 err = host1x_subdev_add(device, driver, child);
70 if (err < 0) {
71 /* XXX cleanup? */
72 of_node_put(child);
73 return err;
74 }
75 }
76 }
77
Thierry Reding776dc382013-10-14 14:43:22 +020078 return 0;
79}
80
81/**
82 * host1x_subdev_del() - remove subdevice
Thierry Reding466749f2017-04-10 12:27:01 +020083 * @subdev: subdevice to remove
Thierry Reding776dc382013-10-14 14:43:22 +020084 */
85static void host1x_subdev_del(struct host1x_subdev *subdev)
86{
87 list_del(&subdev->list);
88 of_node_put(subdev->np);
89 kfree(subdev);
90}
91
92/**
93 * host1x_device_parse_dt() - scan device tree and add matching subdevices
Thierry Reding466749f2017-04-10 12:27:01 +020094 * @device: host1x logical device
95 * @driver: host1x driver
Thierry Reding776dc382013-10-14 14:43:22 +020096 */
Thierry Redingf4c5cf82014-12-18 15:29:14 +010097static int host1x_device_parse_dt(struct host1x_device *device,
98 struct host1x_driver *driver)
Thierry Reding776dc382013-10-14 14:43:22 +020099{
100 struct device_node *np;
101 int err;
102
103 for_each_child_of_node(device->dev.parent->of_node, np) {
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100104 if (of_match_node(driver->subdevs, np) &&
Thierry Reding776dc382013-10-14 14:43:22 +0200105 of_device_is_available(np)) {
Thierry Reding25ae30d2017-08-15 15:46:22 +0200106 err = host1x_subdev_add(device, driver, np);
Amitoj Kaur Chawla93ec3022016-01-24 22:02:10 +0530107 if (err < 0) {
108 of_node_put(np);
Thierry Reding776dc382013-10-14 14:43:22 +0200109 return err;
Amitoj Kaur Chawla93ec3022016-01-24 22:02:10 +0530110 }
Thierry Reding776dc382013-10-14 14:43:22 +0200111 }
112 }
113
114 return 0;
115}
116
117static void host1x_subdev_register(struct host1x_device *device,
118 struct host1x_subdev *subdev,
119 struct host1x_client *client)
120{
121 int err;
122
123 /*
124 * Move the subdevice to the list of active (registered) subdevices
125 * and associate it with a client. At the same time, associate the
126 * client with its parent device.
127 */
128 mutex_lock(&device->subdevs_lock);
129 mutex_lock(&device->clients_lock);
130 list_move_tail(&client->list, &device->clients);
131 list_move_tail(&subdev->list, &device->active);
132 client->parent = &device->dev;
133 subdev->client = client;
134 mutex_unlock(&device->clients_lock);
135 mutex_unlock(&device->subdevs_lock);
136
Thierry Reding776dc382013-10-14 14:43:22 +0200137 if (list_empty(&device->subdevs)) {
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100138 err = device_add(&device->dev);
Thierry Reding776dc382013-10-14 14:43:22 +0200139 if (err < 0)
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100140 dev_err(&device->dev, "failed to add: %d\n", err);
Thierry Reding536e1712014-11-05 11:43:26 +0100141 else
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100142 device->registered = true;
Thierry Reding776dc382013-10-14 14:43:22 +0200143 }
144}
145
146static void __host1x_subdev_unregister(struct host1x_device *device,
147 struct host1x_subdev *subdev)
148{
149 struct host1x_client *client = subdev->client;
Thierry Reding776dc382013-10-14 14:43:22 +0200150
151 /*
152 * If all subdevices have been activated, we're about to remove the
153 * first active subdevice, so unload the driver first.
154 */
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100155 if (list_empty(&device->subdevs)) {
156 if (device->registered) {
157 device->registered = false;
158 device_del(&device->dev);
159 }
Thierry Reding776dc382013-10-14 14:43:22 +0200160 }
161
162 /*
163 * Move the subdevice back to the list of idle subdevices and remove
164 * it from list of clients.
165 */
166 mutex_lock(&device->clients_lock);
167 subdev->client = NULL;
168 client->parent = NULL;
169 list_move_tail(&subdev->list, &device->subdevs);
170 /*
171 * XXX: Perhaps don't do this here, but rather explicitly remove it
172 * when the device is about to be deleted.
173 *
174 * This is somewhat complicated by the fact that this function is
175 * used to remove the subdevice when a client is unregistered but
176 * also when the composite device is about to be removed.
177 */
178 list_del_init(&client->list);
179 mutex_unlock(&device->clients_lock);
180}
181
182static void host1x_subdev_unregister(struct host1x_device *device,
183 struct host1x_subdev *subdev)
184{
185 mutex_lock(&device->subdevs_lock);
186 __host1x_subdev_unregister(device, subdev);
187 mutex_unlock(&device->subdevs_lock);
188}
189
Thierry Reding466749f2017-04-10 12:27:01 +0200190/**
191 * host1x_device_init() - initialize a host1x logical device
192 * @device: host1x logical device
193 *
194 * The driver for the host1x logical device can call this during execution of
195 * its &host1x_driver.probe implementation to initialize each of its clients.
196 * The client drivers access the subsystem specific driver data using the
197 * &host1x_client.parent field and driver data associated with it (usually by
198 * calling dev_get_drvdata()).
199 */
Thierry Reding776dc382013-10-14 14:43:22 +0200200int host1x_device_init(struct host1x_device *device)
201{
202 struct host1x_client *client;
203 int err;
204
205 mutex_lock(&device->clients_lock);
206
207 list_for_each_entry(client, &device->clients, list) {
208 if (client->ops && client->ops->init) {
209 err = client->ops->init(client);
210 if (err < 0) {
211 dev_err(&device->dev,
212 "failed to initialize %s: %d\n",
213 dev_name(client->dev), err);
214 mutex_unlock(&device->clients_lock);
215 return err;
216 }
217 }
218 }
219
220 mutex_unlock(&device->clients_lock);
221
222 return 0;
223}
Thierry Redingfae798a2013-11-08 11:41:42 +0100224EXPORT_SYMBOL(host1x_device_init);
Thierry Reding776dc382013-10-14 14:43:22 +0200225
Thierry Reding466749f2017-04-10 12:27:01 +0200226/**
227 * host1x_device_exit() - uninitialize host1x logical device
228 * @device: host1x logical device
229 *
230 * When the driver for a host1x logical device is unloaded, it can call this
231 * function to tear down each of its clients. Typically this is done after a
232 * subsystem-specific data structure is removed and the functionality can no
233 * longer be used.
234 */
Thierry Reding776dc382013-10-14 14:43:22 +0200235int host1x_device_exit(struct host1x_device *device)
236{
237 struct host1x_client *client;
238 int err;
239
240 mutex_lock(&device->clients_lock);
241
242 list_for_each_entry_reverse(client, &device->clients, list) {
243 if (client->ops && client->ops->exit) {
244 err = client->ops->exit(client);
245 if (err < 0) {
246 dev_err(&device->dev,
247 "failed to cleanup %s: %d\n",
248 dev_name(client->dev), err);
249 mutex_unlock(&device->clients_lock);
250 return err;
251 }
252 }
253 }
254
255 mutex_unlock(&device->clients_lock);
256
257 return 0;
258}
Thierry Redingfae798a2013-11-08 11:41:42 +0100259EXPORT_SYMBOL(host1x_device_exit);
Thierry Reding776dc382013-10-14 14:43:22 +0200260
Thierry Reding0c7dfd32014-05-22 11:12:17 +0200261static int host1x_add_client(struct host1x *host1x,
262 struct host1x_client *client)
Thierry Reding776dc382013-10-14 14:43:22 +0200263{
264 struct host1x_device *device;
265 struct host1x_subdev *subdev;
266
267 mutex_lock(&host1x->devices_lock);
268
269 list_for_each_entry(device, &host1x->devices, list) {
270 list_for_each_entry(subdev, &device->subdevs, list) {
271 if (subdev->np == client->dev->of_node) {
272 host1x_subdev_register(device, subdev, client);
273 mutex_unlock(&host1x->devices_lock);
274 return 0;
275 }
276 }
277 }
278
279 mutex_unlock(&host1x->devices_lock);
280 return -ENODEV;
281}
282
Thierry Reding0c7dfd32014-05-22 11:12:17 +0200283static int host1x_del_client(struct host1x *host1x,
284 struct host1x_client *client)
Thierry Reding776dc382013-10-14 14:43:22 +0200285{
286 struct host1x_device *device, *dt;
287 struct host1x_subdev *subdev;
288
289 mutex_lock(&host1x->devices_lock);
290
291 list_for_each_entry_safe(device, dt, &host1x->devices, list) {
292 list_for_each_entry(subdev, &device->active, list) {
293 if (subdev->client == client) {
294 host1x_subdev_unregister(device, subdev);
295 mutex_unlock(&host1x->devices_lock);
296 return 0;
297 }
298 }
299 }
300
301 mutex_unlock(&host1x->devices_lock);
302 return -ENODEV;
303}
304
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100305static int host1x_device_match(struct device *dev, struct device_driver *drv)
306{
307 return strcmp(dev_name(dev), drv->name) == 0;
308}
309
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100310static const struct dev_pm_ops host1x_device_pm_ops = {
311 .suspend = pm_generic_suspend,
312 .resume = pm_generic_resume,
313 .freeze = pm_generic_freeze,
314 .thaw = pm_generic_thaw,
315 .poweroff = pm_generic_poweroff,
316 .restore = pm_generic_restore,
Thierry Reding776dc382013-10-14 14:43:22 +0200317};
318
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100319struct bus_type host1x_bus_type = {
320 .name = "host1x",
321 .match = host1x_device_match,
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100322 .pm = &host1x_device_pm_ops,
Robin Murphyd89e2372017-10-12 16:56:14 +0100323 .force_dma = true,
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100324};
Thierry Reding776dc382013-10-14 14:43:22 +0200325
Thierry Reding99d2cd82014-12-18 15:26:02 +0100326static void __host1x_device_del(struct host1x_device *device)
327{
328 struct host1x_subdev *subdev, *sd;
329 struct host1x_client *client, *cl;
330
331 mutex_lock(&device->subdevs_lock);
332
333 /* unregister subdevices */
334 list_for_each_entry_safe(subdev, sd, &device->active, list) {
335 /*
336 * host1x_subdev_unregister() will remove the client from
337 * any lists, so we'll need to manually add it back to the
338 * list of idle clients.
339 *
340 * XXX: Alternatively, perhaps don't remove the client from
341 * any lists in host1x_subdev_unregister() and instead do
342 * that explicitly from host1x_unregister_client()?
343 */
344 client = subdev->client;
345
346 __host1x_subdev_unregister(device, subdev);
347
348 /* add the client to the list of idle clients */
349 mutex_lock(&clients_lock);
350 list_add_tail(&client->list, &clients);
351 mutex_unlock(&clients_lock);
352 }
353
354 /* remove subdevices */
355 list_for_each_entry_safe(subdev, sd, &device->subdevs, list)
356 host1x_subdev_del(subdev);
357
358 mutex_unlock(&device->subdevs_lock);
359
360 /* move clients to idle list */
361 mutex_lock(&clients_lock);
362 mutex_lock(&device->clients_lock);
363
364 list_for_each_entry_safe(client, cl, &device->clients, list)
365 list_move_tail(&client->list, &clients);
366
367 mutex_unlock(&device->clients_lock);
368 mutex_unlock(&clients_lock);
369
370 /* finally remove the device */
371 list_del_init(&device->list);
372}
373
Thierry Reding776dc382013-10-14 14:43:22 +0200374static void host1x_device_release(struct device *dev)
375{
376 struct host1x_device *device = to_host1x_device(dev);
377
Thierry Reding99d2cd82014-12-18 15:26:02 +0100378 __host1x_device_del(device);
Thierry Reding776dc382013-10-14 14:43:22 +0200379 kfree(device);
380}
381
382static int host1x_device_add(struct host1x *host1x,
383 struct host1x_driver *driver)
384{
385 struct host1x_client *client, *tmp;
386 struct host1x_subdev *subdev;
387 struct host1x_device *device;
388 int err;
389
390 device = kzalloc(sizeof(*device), GFP_KERNEL);
391 if (!device)
392 return -ENOMEM;
393
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100394 device_initialize(&device->dev);
395
Thierry Reding776dc382013-10-14 14:43:22 +0200396 mutex_init(&device->subdevs_lock);
397 INIT_LIST_HEAD(&device->subdevs);
398 INIT_LIST_HEAD(&device->active);
399 mutex_init(&device->clients_lock);
400 INIT_LIST_HEAD(&device->clients);
401 INIT_LIST_HEAD(&device->list);
402 device->driver = driver;
403
404 device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask;
405 device->dev.dma_mask = &device->dev.coherent_dma_mask;
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100406 dev_set_name(&device->dev, "%s", driver->driver.name);
Thierry Reding776dc382013-10-14 14:43:22 +0200407 device->dev.release = host1x_device_release;
Thierry Reding7b1d4182017-01-20 15:57:35 +0100408 device->dev.of_node = host1x->dev->of_node;
Thierry Reding776dc382013-10-14 14:43:22 +0200409 device->dev.bus = &host1x_bus_type;
410 device->dev.parent = host1x->dev;
411
Mikko Perttunen2fb0dce2017-09-24 12:04:53 +0300412 of_dma_configure(&device->dev, host1x->dev->of_node);
413
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100414 err = host1x_device_parse_dt(device, driver);
Thierry Reding776dc382013-10-14 14:43:22 +0200415 if (err < 0) {
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100416 kfree(device);
Thierry Reding776dc382013-10-14 14:43:22 +0200417 return err;
418 }
419
Thierry Reding776dc382013-10-14 14:43:22 +0200420 list_add_tail(&device->list, &host1x->devices);
Thierry Reding776dc382013-10-14 14:43:22 +0200421
422 mutex_lock(&clients_lock);
423
424 list_for_each_entry_safe(client, tmp, &clients, list) {
425 list_for_each_entry(subdev, &device->subdevs, list) {
426 if (subdev->np == client->dev->of_node) {
427 host1x_subdev_register(device, subdev, client);
428 break;
429 }
430 }
431 }
432
433 mutex_unlock(&clients_lock);
434
435 return 0;
436}
437
438/*
439 * Removes a device by first unregistering any subdevices and then removing
440 * itself from the list of devices.
441 *
442 * This function must be called with the host1x->devices_lock held.
443 */
444static void host1x_device_del(struct host1x *host1x,
445 struct host1x_device *device)
446{
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100447 if (device->registered) {
448 device->registered = false;
449 device_del(&device->dev);
450 }
451
452 put_device(&device->dev);
Thierry Reding776dc382013-10-14 14:43:22 +0200453}
454
455static void host1x_attach_driver(struct host1x *host1x,
456 struct host1x_driver *driver)
457{
458 struct host1x_device *device;
459 int err;
460
461 mutex_lock(&host1x->devices_lock);
462
463 list_for_each_entry(device, &host1x->devices, list) {
464 if (device->driver == driver) {
465 mutex_unlock(&host1x->devices_lock);
466 return;
467 }
468 }
469
Thierry Reding776dc382013-10-14 14:43:22 +0200470 err = host1x_device_add(host1x, driver);
471 if (err < 0)
472 dev_err(host1x->dev, "failed to allocate device: %d\n", err);
Thierry Reding38d98de2014-12-18 15:06:56 +0100473
474 mutex_unlock(&host1x->devices_lock);
Thierry Reding776dc382013-10-14 14:43:22 +0200475}
476
477static void host1x_detach_driver(struct host1x *host1x,
478 struct host1x_driver *driver)
479{
480 struct host1x_device *device, *tmp;
481
482 mutex_lock(&host1x->devices_lock);
483
484 list_for_each_entry_safe(device, tmp, &host1x->devices, list)
485 if (device->driver == driver)
486 host1x_device_del(host1x, device);
487
488 mutex_unlock(&host1x->devices_lock);
489}
490
Thierry Reding466749f2017-04-10 12:27:01 +0200491/**
492 * host1x_register() - register a host1x controller
493 * @host1x: host1x controller
494 *
495 * The host1x controller driver uses this to register a host1x controller with
496 * the infrastructure. Note that all Tegra SoC generations have only ever come
497 * with a single host1x instance, so this function is somewhat academic.
498 */
Thierry Reding776dc382013-10-14 14:43:22 +0200499int host1x_register(struct host1x *host1x)
500{
501 struct host1x_driver *driver;
502
503 mutex_lock(&devices_lock);
504 list_add_tail(&host1x->list, &devices);
505 mutex_unlock(&devices_lock);
506
507 mutex_lock(&drivers_lock);
508
509 list_for_each_entry(driver, &drivers, list)
510 host1x_attach_driver(host1x, driver);
511
512 mutex_unlock(&drivers_lock);
513
514 return 0;
515}
516
Thierry Reding466749f2017-04-10 12:27:01 +0200517/**
518 * host1x_unregister() - unregister a host1x controller
519 * @host1x: host1x controller
520 *
521 * The host1x controller driver uses this to remove a host1x controller from
522 * the infrastructure.
523 */
Thierry Reding776dc382013-10-14 14:43:22 +0200524int host1x_unregister(struct host1x *host1x)
525{
526 struct host1x_driver *driver;
527
528 mutex_lock(&drivers_lock);
529
530 list_for_each_entry(driver, &drivers, list)
531 host1x_detach_driver(host1x, driver);
532
533 mutex_unlock(&drivers_lock);
534
535 mutex_lock(&devices_lock);
536 list_del_init(&host1x->list);
537 mutex_unlock(&devices_lock);
538
539 return 0;
540}
541
Thierry Redingb0d36da2017-03-22 19:15:18 +0100542static int host1x_device_probe(struct device *dev)
543{
544 struct host1x_driver *driver = to_host1x_driver(dev->driver);
545 struct host1x_device *device = to_host1x_device(dev);
546
547 if (driver->probe)
548 return driver->probe(device);
549
550 return 0;
551}
552
553static int host1x_device_remove(struct device *dev)
554{
555 struct host1x_driver *driver = to_host1x_driver(dev->driver);
556 struct host1x_device *device = to_host1x_device(dev);
557
558 if (driver->remove)
559 return driver->remove(device);
560
561 return 0;
562}
563
564static void host1x_device_shutdown(struct device *dev)
565{
566 struct host1x_driver *driver = to_host1x_driver(dev->driver);
567 struct host1x_device *device = to_host1x_device(dev);
568
569 if (driver->shutdown)
570 driver->shutdown(device);
571}
572
Thierry Reding466749f2017-04-10 12:27:01 +0200573/**
574 * host1x_driver_register_full() - register a host1x driver
575 * @driver: host1x driver
576 * @owner: owner module
577 *
578 * Drivers for host1x logical devices call this function to register a driver
579 * with the infrastructure. Note that since these drive logical devices, the
580 * registration of the driver actually triggers tho logical device creation.
581 * A logical device will be created for each host1x instance.
582 */
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100583int host1x_driver_register_full(struct host1x_driver *driver,
584 struct module *owner)
Thierry Reding776dc382013-10-14 14:43:22 +0200585{
586 struct host1x *host1x;
587
588 INIT_LIST_HEAD(&driver->list);
589
590 mutex_lock(&drivers_lock);
591 list_add_tail(&driver->list, &drivers);
592 mutex_unlock(&drivers_lock);
593
594 mutex_lock(&devices_lock);
595
596 list_for_each_entry(host1x, &devices, list)
597 host1x_attach_driver(host1x, driver);
598
599 mutex_unlock(&devices_lock);
600
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100601 driver->driver.bus = &host1x_bus_type;
602 driver->driver.owner = owner;
Thierry Redingb0d36da2017-03-22 19:15:18 +0100603 driver->driver.probe = host1x_device_probe;
604 driver->driver.remove = host1x_device_remove;
605 driver->driver.shutdown = host1x_device_shutdown;
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100606
607 return driver_register(&driver->driver);
Thierry Reding776dc382013-10-14 14:43:22 +0200608}
Thierry Redingf4c5cf82014-12-18 15:29:14 +0100609EXPORT_SYMBOL(host1x_driver_register_full);
Thierry Reding776dc382013-10-14 14:43:22 +0200610
Thierry Reding466749f2017-04-10 12:27:01 +0200611/**
612 * host1x_driver_unregister() - unregister a host1x driver
613 * @driver: host1x driver
614 *
615 * Unbinds the driver from each of the host1x logical devices that it is
616 * bound to, effectively removing the subsystem devices that they represent.
617 */
Thierry Reding776dc382013-10-14 14:43:22 +0200618void host1x_driver_unregister(struct host1x_driver *driver)
619{
Thierry Redinge3e70812015-08-24 14:51:04 +0200620 driver_unregister(&driver->driver);
621
Thierry Reding776dc382013-10-14 14:43:22 +0200622 mutex_lock(&drivers_lock);
623 list_del_init(&driver->list);
624 mutex_unlock(&drivers_lock);
625}
626EXPORT_SYMBOL(host1x_driver_unregister);
627
Thierry Reding466749f2017-04-10 12:27:01 +0200628/**
629 * host1x_client_register() - register a host1x client
630 * @client: host1x client
631 *
632 * Registers a host1x client with each host1x controller instance. Note that
633 * each client will only match their parent host1x controller and will only be
634 * associated with that instance. Once all clients have been registered with
635 * their parent host1x controller, the infrastructure will set up the logical
636 * device and call host1x_device_init(), which will in turn call each client's
637 * &host1x_client_ops.init implementation.
638 */
Thierry Reding776dc382013-10-14 14:43:22 +0200639int host1x_client_register(struct host1x_client *client)
640{
641 struct host1x *host1x;
642 int err;
643
644 mutex_lock(&devices_lock);
645
646 list_for_each_entry(host1x, &devices, list) {
Thierry Reding0c7dfd32014-05-22 11:12:17 +0200647 err = host1x_add_client(host1x, client);
Thierry Reding776dc382013-10-14 14:43:22 +0200648 if (!err) {
649 mutex_unlock(&devices_lock);
650 return 0;
651 }
652 }
653
654 mutex_unlock(&devices_lock);
655
656 mutex_lock(&clients_lock);
657 list_add_tail(&client->list, &clients);
658 mutex_unlock(&clients_lock);
659
660 return 0;
661}
662EXPORT_SYMBOL(host1x_client_register);
663
Thierry Reding466749f2017-04-10 12:27:01 +0200664/**
665 * host1x_client_unregister() - unregister a host1x client
666 * @client: host1x client
667 *
668 * Removes a host1x client from its host1x controller instance. If a logical
669 * device has already been initialized, it will be torn down.
670 */
Thierry Reding776dc382013-10-14 14:43:22 +0200671int host1x_client_unregister(struct host1x_client *client)
672{
673 struct host1x_client *c;
674 struct host1x *host1x;
675 int err;
676
677 mutex_lock(&devices_lock);
678
679 list_for_each_entry(host1x, &devices, list) {
Thierry Reding0c7dfd32014-05-22 11:12:17 +0200680 err = host1x_del_client(host1x, client);
Thierry Reding776dc382013-10-14 14:43:22 +0200681 if (!err) {
682 mutex_unlock(&devices_lock);
683 return 0;
684 }
685 }
686
687 mutex_unlock(&devices_lock);
688 mutex_lock(&clients_lock);
689
690 list_for_each_entry(c, &clients, list) {
691 if (c == client) {
692 list_del_init(&c->list);
693 break;
694 }
695 }
696
697 mutex_unlock(&clients_lock);
698
699 return 0;
700}
701EXPORT_SYMBOL(host1x_client_unregister);