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9952f691 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
776dc384 TR |
2 | /* |
3 | * Copyright (C) 2012 Avionic Design GmbH | |
4 | * Copyright (C) 2012-2013, NVIDIA Corporation | |
776dc384 TR |
5 | */ |
6 | ||
f67524ca | 7 | #include <linux/debugfs.h> |
776dc384 TR |
8 | #include <linux/host1x.h> |
9 | #include <linux/of.h> | |
f67524ca | 10 | #include <linux/seq_file.h> |
776dc384 | 11 | #include <linux/slab.h> |
c95469aa | 12 | #include <linux/of_device.h> |
776dc384 | 13 | |
d24b2898 | 14 | #include "bus.h" |
776dc384 TR |
15 | #include "dev.h" |
16 | ||
17 | static DEFINE_MUTEX(clients_lock); | |
18 | static LIST_HEAD(clients); | |
19 | ||
20 | static DEFINE_MUTEX(drivers_lock); | |
21 | static LIST_HEAD(drivers); | |
22 | ||
23 | static DEFINE_MUTEX(devices_lock); | |
24 | static LIST_HEAD(devices); | |
25 | ||
26 | struct host1x_subdev { | |
27 | struct host1x_client *client; | |
28 | struct device_node *np; | |
29 | struct list_head list; | |
30 | }; | |
31 | ||
32 | /** | |
33 | * host1x_subdev_add() - add a new subdevice with an associated device node | |
466749f1 | 34 | * @device: host1x device to add the subdevice to |
466749f1 | 35 | * @np: device node |
776dc384 TR |
36 | */ |
37 | static int host1x_subdev_add(struct host1x_device *device, | |
25ae30d2 | 38 | struct host1x_driver *driver, |
776dc384 TR |
39 | struct device_node *np) |
40 | { | |
41 | struct host1x_subdev *subdev; | |
25ae30d2 TR |
42 | struct device_node *child; |
43 | int err; | |
776dc384 TR |
44 | |
45 | subdev = kzalloc(sizeof(*subdev), GFP_KERNEL); | |
46 | if (!subdev) | |
47 | return -ENOMEM; | |
48 | ||
49 | INIT_LIST_HEAD(&subdev->list); | |
50 | subdev->np = of_node_get(np); | |
51 | ||
52 | mutex_lock(&device->subdevs_lock); | |
53 | list_add_tail(&subdev->list, &device->subdevs); | |
54 | mutex_unlock(&device->subdevs_lock); | |
55 | ||
25ae30d2 TR |
56 | /* recursively add children */ |
57 | for_each_child_of_node(np, child) { | |
58 | if (of_match_node(driver->subdevs, child) && | |
59 | of_device_is_available(child)) { | |
60 | err = host1x_subdev_add(device, driver, child); | |
61 | if (err < 0) { | |
62 | /* XXX cleanup? */ | |
63 | of_node_put(child); | |
64 | return err; | |
65 | } | |
66 | } | |
67 | } | |
68 | ||
776dc384 TR |
69 | return 0; |
70 | } | |
71 | ||
72 | /** | |
73 | * host1x_subdev_del() - remove subdevice | |
466749f1 | 74 | * @subdev: subdevice to remove |
776dc384 TR |
75 | */ |
76 | static void host1x_subdev_del(struct host1x_subdev *subdev) | |
77 | { | |
78 | list_del(&subdev->list); | |
79 | of_node_put(subdev->np); | |
80 | kfree(subdev); | |
81 | } | |
82 | ||
83 | /** | |
84 | * host1x_device_parse_dt() - scan device tree and add matching subdevices | |
466749f1 TR |
85 | * @device: host1x logical device |
86 | * @driver: host1x driver | |
776dc384 | 87 | */ |
f4c5cf88 TR |
88 | static int host1x_device_parse_dt(struct host1x_device *device, |
89 | struct host1x_driver *driver) | |
776dc384 TR |
90 | { |
91 | struct device_node *np; | |
92 | int err; | |
93 | ||
94 | for_each_child_of_node(device->dev.parent->of_node, np) { | |
f4c5cf88 | 95 | if (of_match_node(driver->subdevs, np) && |
776dc384 | 96 | of_device_is_available(np)) { |
25ae30d2 | 97 | err = host1x_subdev_add(device, driver, np); |
93ec3029 AKC |
98 | if (err < 0) { |
99 | of_node_put(np); | |
776dc384 | 100 | return err; |
93ec3029 | 101 | } |
776dc384 TR |
102 | } |
103 | } | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static void host1x_subdev_register(struct host1x_device *device, | |
109 | struct host1x_subdev *subdev, | |
110 | struct host1x_client *client) | |
111 | { | |
112 | int err; | |
113 | ||
114 | /* | |
115 | * Move the subdevice to the list of active (registered) subdevices | |
116 | * and associate it with a client. At the same time, associate the | |
117 | * client with its parent device. | |
118 | */ | |
119 | mutex_lock(&device->subdevs_lock); | |
120 | mutex_lock(&device->clients_lock); | |
121 | list_move_tail(&client->list, &device->clients); | |
122 | list_move_tail(&subdev->list, &device->active); | |
608f43ad | 123 | client->host = &device->dev; |
776dc384 TR |
124 | subdev->client = client; |
125 | mutex_unlock(&device->clients_lock); | |
126 | mutex_unlock(&device->subdevs_lock); | |
127 | ||
776dc384 | 128 | if (list_empty(&device->subdevs)) { |
f4c5cf88 | 129 | err = device_add(&device->dev); |
776dc384 | 130 | if (err < 0) |
f4c5cf88 | 131 | dev_err(&device->dev, "failed to add: %d\n", err); |
536e1715 | 132 | else |
f4c5cf88 | 133 | device->registered = true; |
776dc384 TR |
134 | } |
135 | } | |
136 | ||
137 | static void __host1x_subdev_unregister(struct host1x_device *device, | |
138 | struct host1x_subdev *subdev) | |
139 | { | |
140 | struct host1x_client *client = subdev->client; | |
776dc384 TR |
141 | |
142 | /* | |
143 | * If all subdevices have been activated, we're about to remove the | |
144 | * first active subdevice, so unload the driver first. | |
145 | */ | |
f4c5cf88 TR |
146 | if (list_empty(&device->subdevs)) { |
147 | if (device->registered) { | |
148 | device->registered = false; | |
149 | device_del(&device->dev); | |
150 | } | |
776dc384 TR |
151 | } |
152 | ||
153 | /* | |
154 | * Move the subdevice back to the list of idle subdevices and remove | |
155 | * it from list of clients. | |
156 | */ | |
157 | mutex_lock(&device->clients_lock); | |
158 | subdev->client = NULL; | |
608f43ad | 159 | client->host = NULL; |
776dc384 TR |
160 | list_move_tail(&subdev->list, &device->subdevs); |
161 | /* | |
162 | * XXX: Perhaps don't do this here, but rather explicitly remove it | |
163 | * when the device is about to be deleted. | |
164 | * | |
165 | * This is somewhat complicated by the fact that this function is | |
166 | * used to remove the subdevice when a client is unregistered but | |
167 | * also when the composite device is about to be removed. | |
168 | */ | |
169 | list_del_init(&client->list); | |
170 | mutex_unlock(&device->clients_lock); | |
171 | } | |
172 | ||
173 | static void host1x_subdev_unregister(struct host1x_device *device, | |
174 | struct host1x_subdev *subdev) | |
175 | { | |
176 | mutex_lock(&device->subdevs_lock); | |
177 | __host1x_subdev_unregister(device, subdev); | |
178 | mutex_unlock(&device->subdevs_lock); | |
179 | } | |
180 | ||
466749f1 TR |
181 | /** |
182 | * host1x_device_init() - initialize a host1x logical device | |
183 | * @device: host1x logical device | |
184 | * | |
185 | * The driver for the host1x logical device can call this during execution of | |
186 | * its &host1x_driver.probe implementation to initialize each of its clients. | |
187 | * The client drivers access the subsystem specific driver data using the | |
188 | * &host1x_client.parent field and driver data associated with it (usually by | |
189 | * calling dev_get_drvdata()). | |
190 | */ | |
776dc384 TR |
191 | int host1x_device_init(struct host1x_device *device) |
192 | { | |
193 | struct host1x_client *client; | |
194 | int err; | |
195 | ||
196 | mutex_lock(&device->clients_lock); | |
197 | ||
198 | list_for_each_entry(client, &device->clients, list) { | |
199 | if (client->ops && client->ops->init) { | |
200 | err = client->ops->init(client); | |
201 | if (err < 0) { | |
202 | dev_err(&device->dev, | |
203 | "failed to initialize %s: %d\n", | |
204 | dev_name(client->dev), err); | |
8f7da157 | 205 | goto teardown; |
776dc384 TR |
206 | } |
207 | } | |
208 | } | |
209 | ||
210 | mutex_unlock(&device->clients_lock); | |
211 | ||
212 | return 0; | |
8f7da157 TR |
213 | |
214 | teardown: | |
215 | list_for_each_entry_continue_reverse(client, &device->clients, list) | |
216 | if (client->ops->exit) | |
217 | client->ops->exit(client); | |
218 | ||
219 | mutex_unlock(&device->clients_lock); | |
220 | return err; | |
776dc384 | 221 | } |
fae798a1 | 222 | EXPORT_SYMBOL(host1x_device_init); |
776dc384 | 223 | |
466749f1 TR |
224 | /** |
225 | * host1x_device_exit() - uninitialize host1x logical device | |
226 | * @device: host1x logical device | |
227 | * | |
228 | * When the driver for a host1x logical device is unloaded, it can call this | |
229 | * function to tear down each of its clients. Typically this is done after a | |
230 | * subsystem-specific data structure is removed and the functionality can no | |
231 | * longer be used. | |
232 | */ | |
776dc384 TR |
233 | int host1x_device_exit(struct host1x_device *device) |
234 | { | |
235 | struct host1x_client *client; | |
236 | int err; | |
237 | ||
238 | mutex_lock(&device->clients_lock); | |
239 | ||
240 | list_for_each_entry_reverse(client, &device->clients, list) { | |
241 | if (client->ops && client->ops->exit) { | |
242 | err = client->ops->exit(client); | |
243 | if (err < 0) { | |
244 | dev_err(&device->dev, | |
245 | "failed to cleanup %s: %d\n", | |
246 | dev_name(client->dev), err); | |
247 | mutex_unlock(&device->clients_lock); | |
248 | return err; | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | mutex_unlock(&device->clients_lock); | |
254 | ||
255 | return 0; | |
256 | } | |
fae798a1 | 257 | EXPORT_SYMBOL(host1x_device_exit); |
776dc384 | 258 | |
0c7dfd36 TR |
259 | static int host1x_add_client(struct host1x *host1x, |
260 | struct host1x_client *client) | |
776dc384 TR |
261 | { |
262 | struct host1x_device *device; | |
263 | struct host1x_subdev *subdev; | |
264 | ||
265 | mutex_lock(&host1x->devices_lock); | |
266 | ||
267 | list_for_each_entry(device, &host1x->devices, list) { | |
268 | list_for_each_entry(subdev, &device->subdevs, list) { | |
269 | if (subdev->np == client->dev->of_node) { | |
270 | host1x_subdev_register(device, subdev, client); | |
271 | mutex_unlock(&host1x->devices_lock); | |
272 | return 0; | |
273 | } | |
274 | } | |
275 | } | |
276 | ||
277 | mutex_unlock(&host1x->devices_lock); | |
278 | return -ENODEV; | |
279 | } | |
280 | ||
0c7dfd36 TR |
281 | static int host1x_del_client(struct host1x *host1x, |
282 | struct host1x_client *client) | |
776dc384 TR |
283 | { |
284 | struct host1x_device *device, *dt; | |
285 | struct host1x_subdev *subdev; | |
286 | ||
287 | mutex_lock(&host1x->devices_lock); | |
288 | ||
289 | list_for_each_entry_safe(device, dt, &host1x->devices, list) { | |
290 | list_for_each_entry(subdev, &device->active, list) { | |
291 | if (subdev->client == client) { | |
292 | host1x_subdev_unregister(device, subdev); | |
293 | mutex_unlock(&host1x->devices_lock); | |
294 | return 0; | |
295 | } | |
296 | } | |
297 | } | |
298 | ||
299 | mutex_unlock(&host1x->devices_lock); | |
300 | return -ENODEV; | |
301 | } | |
302 | ||
f4c5cf88 TR |
303 | static int host1x_device_match(struct device *dev, struct device_driver *drv) |
304 | { | |
305 | return strcmp(dev_name(dev), drv->name) == 0; | |
306 | } | |
776dc384 | 307 | |
31fa25f1 TR |
308 | static int host1x_device_uevent(struct device *dev, |
309 | struct kobj_uevent_env *env) | |
310 | { | |
311 | struct device_node *np = dev->parent->of_node; | |
312 | unsigned int count = 0; | |
313 | struct property *p; | |
314 | const char *compat; | |
315 | ||
316 | /* | |
317 | * This duplicates most of of_device_uevent(), but the latter cannot | |
318 | * be called from modules and operates on dev->of_node, which is not | |
319 | * available in this case. | |
320 | * | |
321 | * Note that this is really only needed for backwards compatibility | |
322 | * with libdrm, which parses this information from sysfs and will | |
323 | * fail if it can't find the OF_FULLNAME, specifically. | |
324 | */ | |
325 | add_uevent_var(env, "OF_NAME=%pOFn", np); | |
326 | add_uevent_var(env, "OF_FULLNAME=%pOF", np); | |
327 | ||
328 | of_property_for_each_string(np, "compatible", p, compat) { | |
329 | add_uevent_var(env, "OF_COMPATIBLE_%u=%s", count, compat); | |
330 | count++; | |
331 | } | |
332 | ||
333 | add_uevent_var(env, "OF_COMPATIBLE_N=%u", count); | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
07397df2 NG |
338 | static int host1x_dma_configure(struct device *dev) |
339 | { | |
3d6ce86e | 340 | return of_dma_configure(dev, dev->of_node, true); |
07397df2 NG |
341 | } |
342 | ||
f4c5cf88 TR |
343 | static const struct dev_pm_ops host1x_device_pm_ops = { |
344 | .suspend = pm_generic_suspend, | |
345 | .resume = pm_generic_resume, | |
346 | .freeze = pm_generic_freeze, | |
347 | .thaw = pm_generic_thaw, | |
348 | .poweroff = pm_generic_poweroff, | |
349 | .restore = pm_generic_restore, | |
350 | }; | |
351 | ||
352 | struct bus_type host1x_bus_type = { | |
353 | .name = "host1x", | |
354 | .match = host1x_device_match, | |
31fa25f1 | 355 | .uevent = host1x_device_uevent, |
50bac83c | 356 | .dma_configure = host1x_dma_configure, |
f4c5cf88 TR |
357 | .pm = &host1x_device_pm_ops, |
358 | }; | |
359 | ||
99d2cd81 TR |
360 | static void __host1x_device_del(struct host1x_device *device) |
361 | { | |
362 | struct host1x_subdev *subdev, *sd; | |
363 | struct host1x_client *client, *cl; | |
364 | ||
365 | mutex_lock(&device->subdevs_lock); | |
366 | ||
367 | /* unregister subdevices */ | |
368 | list_for_each_entry_safe(subdev, sd, &device->active, list) { | |
369 | /* | |
370 | * host1x_subdev_unregister() will remove the client from | |
371 | * any lists, so we'll need to manually add it back to the | |
372 | * list of idle clients. | |
373 | * | |
374 | * XXX: Alternatively, perhaps don't remove the client from | |
375 | * any lists in host1x_subdev_unregister() and instead do | |
376 | * that explicitly from host1x_unregister_client()? | |
377 | */ | |
378 | client = subdev->client; | |
379 | ||
380 | __host1x_subdev_unregister(device, subdev); | |
381 | ||
382 | /* add the client to the list of idle clients */ | |
383 | mutex_lock(&clients_lock); | |
384 | list_add_tail(&client->list, &clients); | |
385 | mutex_unlock(&clients_lock); | |
386 | } | |
387 | ||
388 | /* remove subdevices */ | |
389 | list_for_each_entry_safe(subdev, sd, &device->subdevs, list) | |
390 | host1x_subdev_del(subdev); | |
391 | ||
392 | mutex_unlock(&device->subdevs_lock); | |
393 | ||
394 | /* move clients to idle list */ | |
395 | mutex_lock(&clients_lock); | |
396 | mutex_lock(&device->clients_lock); | |
397 | ||
398 | list_for_each_entry_safe(client, cl, &device->clients, list) | |
399 | list_move_tail(&client->list, &clients); | |
400 | ||
401 | mutex_unlock(&device->clients_lock); | |
402 | mutex_unlock(&clients_lock); | |
403 | ||
404 | /* finally remove the device */ | |
405 | list_del_init(&device->list); | |
406 | } | |
407 | ||
776dc384 TR |
408 | static void host1x_device_release(struct device *dev) |
409 | { | |
410 | struct host1x_device *device = to_host1x_device(dev); | |
411 | ||
99d2cd81 | 412 | __host1x_device_del(device); |
776dc384 TR |
413 | kfree(device); |
414 | } | |
415 | ||
416 | static int host1x_device_add(struct host1x *host1x, | |
417 | struct host1x_driver *driver) | |
418 | { | |
419 | struct host1x_client *client, *tmp; | |
420 | struct host1x_subdev *subdev; | |
421 | struct host1x_device *device; | |
422 | int err; | |
423 | ||
424 | device = kzalloc(sizeof(*device), GFP_KERNEL); | |
425 | if (!device) | |
426 | return -ENOMEM; | |
427 | ||
f4c5cf88 TR |
428 | device_initialize(&device->dev); |
429 | ||
776dc384 TR |
430 | mutex_init(&device->subdevs_lock); |
431 | INIT_LIST_HEAD(&device->subdevs); | |
432 | INIT_LIST_HEAD(&device->active); | |
433 | mutex_init(&device->clients_lock); | |
434 | INIT_LIST_HEAD(&device->clients); | |
435 | INIT_LIST_HEAD(&device->list); | |
436 | device->driver = driver; | |
437 | ||
438 | device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask; | |
439 | device->dev.dma_mask = &device->dev.coherent_dma_mask; | |
f4c5cf88 | 440 | dev_set_name(&device->dev, "%s", driver->driver.name); |
776dc384 | 441 | device->dev.release = host1x_device_release; |
776dc384 TR |
442 | device->dev.bus = &host1x_bus_type; |
443 | device->dev.parent = host1x->dev; | |
444 | ||
3d6ce86e | 445 | of_dma_configure(&device->dev, host1x->dev->of_node, true); |
2fb0dceb | 446 | |
1e390478 | 447 | device->dev.dma_parms = &device->dma_parms; |
d98914eb | 448 | dma_set_max_seg_size(&device->dev, UINT_MAX); |
1e390478 | 449 | |
f4c5cf88 | 450 | err = host1x_device_parse_dt(device, driver); |
776dc384 | 451 | if (err < 0) { |
f4c5cf88 | 452 | kfree(device); |
776dc384 TR |
453 | return err; |
454 | } | |
455 | ||
776dc384 | 456 | list_add_tail(&device->list, &host1x->devices); |
776dc384 TR |
457 | |
458 | mutex_lock(&clients_lock); | |
459 | ||
460 | list_for_each_entry_safe(client, tmp, &clients, list) { | |
461 | list_for_each_entry(subdev, &device->subdevs, list) { | |
462 | if (subdev->np == client->dev->of_node) { | |
463 | host1x_subdev_register(device, subdev, client); | |
464 | break; | |
465 | } | |
466 | } | |
467 | } | |
468 | ||
469 | mutex_unlock(&clients_lock); | |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Removes a device by first unregistering any subdevices and then removing | |
476 | * itself from the list of devices. | |
477 | * | |
478 | * This function must be called with the host1x->devices_lock held. | |
479 | */ | |
480 | static void host1x_device_del(struct host1x *host1x, | |
481 | struct host1x_device *device) | |
482 | { | |
f4c5cf88 TR |
483 | if (device->registered) { |
484 | device->registered = false; | |
485 | device_del(&device->dev); | |
486 | } | |
487 | ||
488 | put_device(&device->dev); | |
776dc384 TR |
489 | } |
490 | ||
491 | static void host1x_attach_driver(struct host1x *host1x, | |
492 | struct host1x_driver *driver) | |
493 | { | |
494 | struct host1x_device *device; | |
495 | int err; | |
496 | ||
497 | mutex_lock(&host1x->devices_lock); | |
498 | ||
499 | list_for_each_entry(device, &host1x->devices, list) { | |
500 | if (device->driver == driver) { | |
501 | mutex_unlock(&host1x->devices_lock); | |
502 | return; | |
503 | } | |
504 | } | |
505 | ||
776dc384 TR |
506 | err = host1x_device_add(host1x, driver); |
507 | if (err < 0) | |
508 | dev_err(host1x->dev, "failed to allocate device: %d\n", err); | |
38d98de4 TR |
509 | |
510 | mutex_unlock(&host1x->devices_lock); | |
776dc384 TR |
511 | } |
512 | ||
513 | static void host1x_detach_driver(struct host1x *host1x, | |
514 | struct host1x_driver *driver) | |
515 | { | |
516 | struct host1x_device *device, *tmp; | |
517 | ||
518 | mutex_lock(&host1x->devices_lock); | |
519 | ||
520 | list_for_each_entry_safe(device, tmp, &host1x->devices, list) | |
521 | if (device->driver == driver) | |
522 | host1x_device_del(host1x, device); | |
523 | ||
524 | mutex_unlock(&host1x->devices_lock); | |
525 | } | |
526 | ||
f67524ca TR |
527 | static int host1x_devices_show(struct seq_file *s, void *data) |
528 | { | |
529 | struct host1x *host1x = s->private; | |
530 | struct host1x_device *device; | |
531 | ||
532 | mutex_lock(&host1x->devices_lock); | |
533 | ||
534 | list_for_each_entry(device, &host1x->devices, list) { | |
535 | struct host1x_subdev *subdev; | |
536 | ||
537 | seq_printf(s, "%s\n", dev_name(&device->dev)); | |
538 | ||
539 | mutex_lock(&device->subdevs_lock); | |
540 | ||
541 | list_for_each_entry(subdev, &device->active, list) | |
542 | seq_printf(s, " %pOFf: %s\n", subdev->np, | |
543 | dev_name(subdev->client->dev)); | |
544 | ||
545 | list_for_each_entry(subdev, &device->subdevs, list) | |
546 | seq_printf(s, " %pOFf:\n", subdev->np); | |
547 | ||
548 | mutex_unlock(&device->subdevs_lock); | |
549 | } | |
550 | ||
551 | mutex_unlock(&host1x->devices_lock); | |
552 | ||
553 | return 0; | |
554 | } | |
555 | DEFINE_SHOW_ATTRIBUTE(host1x_devices); | |
556 | ||
466749f1 TR |
557 | /** |
558 | * host1x_register() - register a host1x controller | |
559 | * @host1x: host1x controller | |
560 | * | |
561 | * The host1x controller driver uses this to register a host1x controller with | |
562 | * the infrastructure. Note that all Tegra SoC generations have only ever come | |
563 | * with a single host1x instance, so this function is somewhat academic. | |
564 | */ | |
776dc384 TR |
565 | int host1x_register(struct host1x *host1x) |
566 | { | |
567 | struct host1x_driver *driver; | |
568 | ||
569 | mutex_lock(&devices_lock); | |
570 | list_add_tail(&host1x->list, &devices); | |
571 | mutex_unlock(&devices_lock); | |
572 | ||
573 | mutex_lock(&drivers_lock); | |
574 | ||
575 | list_for_each_entry(driver, &drivers, list) | |
576 | host1x_attach_driver(host1x, driver); | |
577 | ||
578 | mutex_unlock(&drivers_lock); | |
579 | ||
f67524ca TR |
580 | debugfs_create_file("devices", S_IRUGO, host1x->debugfs, host1x, |
581 | &host1x_devices_fops); | |
582 | ||
776dc384 TR |
583 | return 0; |
584 | } | |
585 | ||
466749f1 TR |
586 | /** |
587 | * host1x_unregister() - unregister a host1x controller | |
588 | * @host1x: host1x controller | |
589 | * | |
590 | * The host1x controller driver uses this to remove a host1x controller from | |
591 | * the infrastructure. | |
592 | */ | |
776dc384 TR |
593 | int host1x_unregister(struct host1x *host1x) |
594 | { | |
595 | struct host1x_driver *driver; | |
596 | ||
597 | mutex_lock(&drivers_lock); | |
598 | ||
599 | list_for_each_entry(driver, &drivers, list) | |
600 | host1x_detach_driver(host1x, driver); | |
601 | ||
602 | mutex_unlock(&drivers_lock); | |
603 | ||
604 | mutex_lock(&devices_lock); | |
605 | list_del_init(&host1x->list); | |
606 | mutex_unlock(&devices_lock); | |
607 | ||
608 | return 0; | |
609 | } | |
610 | ||
b0d36daa TR |
611 | static int host1x_device_probe(struct device *dev) |
612 | { | |
613 | struct host1x_driver *driver = to_host1x_driver(dev->driver); | |
614 | struct host1x_device *device = to_host1x_device(dev); | |
615 | ||
616 | if (driver->probe) | |
617 | return driver->probe(device); | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | static int host1x_device_remove(struct device *dev) | |
623 | { | |
624 | struct host1x_driver *driver = to_host1x_driver(dev->driver); | |
625 | struct host1x_device *device = to_host1x_device(dev); | |
626 | ||
627 | if (driver->remove) | |
628 | return driver->remove(device); | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static void host1x_device_shutdown(struct device *dev) | |
634 | { | |
635 | struct host1x_driver *driver = to_host1x_driver(dev->driver); | |
636 | struct host1x_device *device = to_host1x_device(dev); | |
637 | ||
638 | if (driver->shutdown) | |
639 | driver->shutdown(device); | |
640 | } | |
641 | ||
466749f1 TR |
642 | /** |
643 | * host1x_driver_register_full() - register a host1x driver | |
644 | * @driver: host1x driver | |
645 | * @owner: owner module | |
646 | * | |
647 | * Drivers for host1x logical devices call this function to register a driver | |
648 | * with the infrastructure. Note that since these drive logical devices, the | |
649 | * registration of the driver actually triggers tho logical device creation. | |
650 | * A logical device will be created for each host1x instance. | |
651 | */ | |
f4c5cf88 TR |
652 | int host1x_driver_register_full(struct host1x_driver *driver, |
653 | struct module *owner) | |
776dc384 TR |
654 | { |
655 | struct host1x *host1x; | |
656 | ||
657 | INIT_LIST_HEAD(&driver->list); | |
658 | ||
659 | mutex_lock(&drivers_lock); | |
660 | list_add_tail(&driver->list, &drivers); | |
661 | mutex_unlock(&drivers_lock); | |
662 | ||
663 | mutex_lock(&devices_lock); | |
664 | ||
665 | list_for_each_entry(host1x, &devices, list) | |
666 | host1x_attach_driver(host1x, driver); | |
667 | ||
668 | mutex_unlock(&devices_lock); | |
669 | ||
f4c5cf88 TR |
670 | driver->driver.bus = &host1x_bus_type; |
671 | driver->driver.owner = owner; | |
b0d36daa TR |
672 | driver->driver.probe = host1x_device_probe; |
673 | driver->driver.remove = host1x_device_remove; | |
674 | driver->driver.shutdown = host1x_device_shutdown; | |
f4c5cf88 TR |
675 | |
676 | return driver_register(&driver->driver); | |
776dc384 | 677 | } |
f4c5cf88 | 678 | EXPORT_SYMBOL(host1x_driver_register_full); |
776dc384 | 679 | |
466749f1 TR |
680 | /** |
681 | * host1x_driver_unregister() - unregister a host1x driver | |
682 | * @driver: host1x driver | |
683 | * | |
684 | * Unbinds the driver from each of the host1x logical devices that it is | |
685 | * bound to, effectively removing the subsystem devices that they represent. | |
686 | */ | |
776dc384 TR |
687 | void host1x_driver_unregister(struct host1x_driver *driver) |
688 | { | |
e3e70814 TR |
689 | driver_unregister(&driver->driver); |
690 | ||
776dc384 TR |
691 | mutex_lock(&drivers_lock); |
692 | list_del_init(&driver->list); | |
693 | mutex_unlock(&drivers_lock); | |
694 | } | |
695 | EXPORT_SYMBOL(host1x_driver_unregister); | |
696 | ||
466749f1 TR |
697 | /** |
698 | * host1x_client_register() - register a host1x client | |
699 | * @client: host1x client | |
700 | * | |
701 | * Registers a host1x client with each host1x controller instance. Note that | |
702 | * each client will only match their parent host1x controller and will only be | |
703 | * associated with that instance. Once all clients have been registered with | |
704 | * their parent host1x controller, the infrastructure will set up the logical | |
705 | * device and call host1x_device_init(), which will in turn call each client's | |
706 | * &host1x_client_ops.init implementation. | |
707 | */ | |
776dc384 TR |
708 | int host1x_client_register(struct host1x_client *client) |
709 | { | |
710 | struct host1x *host1x; | |
711 | int err; | |
712 | ||
fd67e9c6 TR |
713 | INIT_LIST_HEAD(&client->list); |
714 | mutex_init(&client->lock); | |
715 | client->usecount = 0; | |
716 | ||
776dc384 TR |
717 | mutex_lock(&devices_lock); |
718 | ||
719 | list_for_each_entry(host1x, &devices, list) { | |
0c7dfd36 | 720 | err = host1x_add_client(host1x, client); |
776dc384 TR |
721 | if (!err) { |
722 | mutex_unlock(&devices_lock); | |
723 | return 0; | |
724 | } | |
725 | } | |
726 | ||
727 | mutex_unlock(&devices_lock); | |
728 | ||
729 | mutex_lock(&clients_lock); | |
730 | list_add_tail(&client->list, &clients); | |
731 | mutex_unlock(&clients_lock); | |
732 | ||
733 | return 0; | |
734 | } | |
735 | EXPORT_SYMBOL(host1x_client_register); | |
736 | ||
466749f1 TR |
737 | /** |
738 | * host1x_client_unregister() - unregister a host1x client | |
739 | * @client: host1x client | |
740 | * | |
741 | * Removes a host1x client from its host1x controller instance. If a logical | |
742 | * device has already been initialized, it will be torn down. | |
743 | */ | |
776dc384 TR |
744 | int host1x_client_unregister(struct host1x_client *client) |
745 | { | |
746 | struct host1x_client *c; | |
747 | struct host1x *host1x; | |
748 | int err; | |
749 | ||
750 | mutex_lock(&devices_lock); | |
751 | ||
752 | list_for_each_entry(host1x, &devices, list) { | |
0c7dfd36 | 753 | err = host1x_del_client(host1x, client); |
776dc384 TR |
754 | if (!err) { |
755 | mutex_unlock(&devices_lock); | |
756 | return 0; | |
757 | } | |
758 | } | |
759 | ||
760 | mutex_unlock(&devices_lock); | |
761 | mutex_lock(&clients_lock); | |
762 | ||
763 | list_for_each_entry(c, &clients, list) { | |
764 | if (c == client) { | |
765 | list_del_init(&c->list); | |
766 | break; | |
767 | } | |
768 | } | |
769 | ||
770 | mutex_unlock(&clients_lock); | |
771 | ||
772 | return 0; | |
773 | } | |
774 | EXPORT_SYMBOL(host1x_client_unregister); | |
fd67e9c6 TR |
775 | |
776 | int host1x_client_suspend(struct host1x_client *client) | |
777 | { | |
778 | int err = 0; | |
779 | ||
780 | mutex_lock(&client->lock); | |
781 | ||
782 | if (client->usecount == 1) { | |
783 | if (client->ops && client->ops->suspend) { | |
784 | err = client->ops->suspend(client); | |
785 | if (err < 0) | |
786 | goto unlock; | |
787 | } | |
788 | } | |
789 | ||
790 | client->usecount--; | |
791 | dev_dbg(client->dev, "use count: %u\n", client->usecount); | |
792 | ||
793 | if (client->parent) { | |
794 | err = host1x_client_suspend(client->parent); | |
795 | if (err < 0) | |
796 | goto resume; | |
797 | } | |
798 | ||
799 | goto unlock; | |
800 | ||
801 | resume: | |
802 | if (client->usecount == 0) | |
803 | if (client->ops && client->ops->resume) | |
804 | client->ops->resume(client); | |
805 | ||
806 | client->usecount++; | |
807 | unlock: | |
808 | mutex_unlock(&client->lock); | |
809 | return err; | |
810 | } | |
811 | EXPORT_SYMBOL(host1x_client_suspend); | |
812 | ||
813 | int host1x_client_resume(struct host1x_client *client) | |
814 | { | |
815 | int err = 0; | |
816 | ||
817 | mutex_lock(&client->lock); | |
818 | ||
819 | if (client->parent) { | |
820 | err = host1x_client_resume(client->parent); | |
821 | if (err < 0) | |
822 | goto unlock; | |
823 | } | |
824 | ||
825 | if (client->usecount == 0) { | |
826 | if (client->ops && client->ops->resume) { | |
827 | err = client->ops->resume(client); | |
828 | if (err < 0) | |
829 | goto suspend; | |
830 | } | |
831 | } | |
832 | ||
833 | client->usecount++; | |
834 | dev_dbg(client->dev, "use count: %u\n", client->usecount); | |
835 | ||
836 | goto unlock; | |
837 | ||
838 | suspend: | |
839 | if (client->parent) | |
840 | host1x_client_suspend(client->parent); | |
841 | unlock: | |
842 | mutex_unlock(&client->lock); | |
843 | return err; | |
844 | } | |
845 | EXPORT_SYMBOL(host1x_client_resume); |