Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 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> |
Alexandre Courbot | c95469a | 2016-02-26 18:06:53 +0900 | [diff] [blame] | 21 | #include <linux/of_device.h> |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 22 | |
Thierry Reding | d24b289 | 2013-11-08 13:20:23 +0100 | [diff] [blame] | 23 | #include "bus.h" |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 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 |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 43 | * @device: host1x device to add the subdevice to |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 44 | * @np: device node |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 45 | */ |
| 46 | static int host1x_subdev_add(struct host1x_device *device, |
Thierry Reding | 25ae30d | 2017-08-15 15:46:22 +0200 | [diff] [blame] | 47 | struct host1x_driver *driver, |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 48 | struct device_node *np) |
| 49 | { |
| 50 | struct host1x_subdev *subdev; |
Thierry Reding | 25ae30d | 2017-08-15 15:46:22 +0200 | [diff] [blame] | 51 | struct device_node *child; |
| 52 | int err; |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 53 | |
| 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 Reding | 25ae30d | 2017-08-15 15:46:22 +0200 | [diff] [blame] | 65 | /* 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * host1x_subdev_del() - remove subdevice |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 83 | * @subdev: subdevice to remove |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 84 | */ |
| 85 | static 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 Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 94 | * @device: host1x logical device |
| 95 | * @driver: host1x driver |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 96 | */ |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 97 | static int host1x_device_parse_dt(struct host1x_device *device, |
| 98 | struct host1x_driver *driver) |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 99 | { |
| 100 | struct device_node *np; |
| 101 | int err; |
| 102 | |
| 103 | for_each_child_of_node(device->dev.parent->of_node, np) { |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 104 | if (of_match_node(driver->subdevs, np) && |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 105 | of_device_is_available(np)) { |
Thierry Reding | 25ae30d | 2017-08-15 15:46:22 +0200 | [diff] [blame] | 106 | err = host1x_subdev_add(device, driver, np); |
Amitoj Kaur Chawla | 93ec302 | 2016-01-24 22:02:10 +0530 | [diff] [blame] | 107 | if (err < 0) { |
| 108 | of_node_put(np); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 109 | return err; |
Amitoj Kaur Chawla | 93ec302 | 2016-01-24 22:02:10 +0530 | [diff] [blame] | 110 | } |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 111 | } |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 137 | if (list_empty(&device->subdevs)) { |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 138 | err = device_add(&device->dev); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 139 | if (err < 0) |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 140 | dev_err(&device->dev, "failed to add: %d\n", err); |
Thierry Reding | 536e171 | 2014-11-05 11:43:26 +0100 | [diff] [blame] | 141 | else |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 142 | device->registered = true; |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 143 | } |
| 144 | } |
| 145 | |
| 146 | static void __host1x_subdev_unregister(struct host1x_device *device, |
| 147 | struct host1x_subdev *subdev) |
| 148 | { |
| 149 | struct host1x_client *client = subdev->client; |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 150 | |
| 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 Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 155 | if (list_empty(&device->subdevs)) { |
| 156 | if (device->registered) { |
| 157 | device->registered = false; |
| 158 | device_del(&device->dev); |
| 159 | } |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 160 | } |
| 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 | |
| 182 | static 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 Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 190 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 200 | int 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 Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame] | 224 | EXPORT_SYMBOL(host1x_device_init); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 225 | |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 226 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 235 | int 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 Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame] | 259 | EXPORT_SYMBOL(host1x_device_exit); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 260 | |
Thierry Reding | 0c7dfd3 | 2014-05-22 11:12:17 +0200 | [diff] [blame] | 261 | static int host1x_add_client(struct host1x *host1x, |
| 262 | struct host1x_client *client) |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 263 | { |
| 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 Reding | 0c7dfd3 | 2014-05-22 11:12:17 +0200 | [diff] [blame] | 283 | static int host1x_del_client(struct host1x *host1x, |
| 284 | struct host1x_client *client) |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 285 | { |
| 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 Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 305 | static int host1x_device_match(struct device *dev, struct device_driver *drv) |
| 306 | { |
| 307 | return strcmp(dev_name(dev), drv->name) == 0; |
| 308 | } |
| 309 | |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 310 | static 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 317 | }; |
| 318 | |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 319 | struct bus_type host1x_bus_type = { |
| 320 | .name = "host1x", |
| 321 | .match = host1x_device_match, |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 322 | .pm = &host1x_device_pm_ops, |
Robin Murphy | d89e237 | 2017-10-12 16:56:14 +0100 | [diff] [blame] | 323 | .force_dma = true, |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 324 | }; |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 325 | |
Thierry Reding | 99d2cd8 | 2014-12-18 15:26:02 +0100 | [diff] [blame] | 326 | static 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 374 | static void host1x_device_release(struct device *dev) |
| 375 | { |
| 376 | struct host1x_device *device = to_host1x_device(dev); |
| 377 | |
Thierry Reding | 99d2cd8 | 2014-12-18 15:26:02 +0100 | [diff] [blame] | 378 | __host1x_device_del(device); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 379 | kfree(device); |
| 380 | } |
| 381 | |
| 382 | static 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 Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 394 | device_initialize(&device->dev); |
| 395 | |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 396 | 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 Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 406 | dev_set_name(&device->dev, "%s", driver->driver.name); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 407 | device->dev.release = host1x_device_release; |
Thierry Reding | 7b1d418 | 2017-01-20 15:57:35 +0100 | [diff] [blame] | 408 | device->dev.of_node = host1x->dev->of_node; |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 409 | device->dev.bus = &host1x_bus_type; |
| 410 | device->dev.parent = host1x->dev; |
| 411 | |
Mikko Perttunen | 2fb0dce | 2017-09-24 12:04:53 +0300 | [diff] [blame] | 412 | of_dma_configure(&device->dev, host1x->dev->of_node); |
| 413 | |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 414 | err = host1x_device_parse_dt(device, driver); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 415 | if (err < 0) { |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 416 | kfree(device); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 417 | return err; |
| 418 | } |
| 419 | |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 420 | list_add_tail(&device->list, &host1x->devices); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 421 | |
| 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 | */ |
| 444 | static void host1x_device_del(struct host1x *host1x, |
| 445 | struct host1x_device *device) |
| 446 | { |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 447 | if (device->registered) { |
| 448 | device->registered = false; |
| 449 | device_del(&device->dev); |
| 450 | } |
| 451 | |
| 452 | put_device(&device->dev); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | static 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 470 | err = host1x_device_add(host1x, driver); |
| 471 | if (err < 0) |
| 472 | dev_err(host1x->dev, "failed to allocate device: %d\n", err); |
Thierry Reding | 38d98de | 2014-12-18 15:06:56 +0100 | [diff] [blame] | 473 | |
| 474 | mutex_unlock(&host1x->devices_lock); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | static 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 Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 491 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 499 | int 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 Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 517 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 524 | int 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 Reding | b0d36da | 2017-03-22 19:15:18 +0100 | [diff] [blame] | 542 | static 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 | |
| 553 | static 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 | |
| 564 | static 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 Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 573 | /** |
| 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 Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 583 | int host1x_driver_register_full(struct host1x_driver *driver, |
| 584 | struct module *owner) |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 585 | { |
| 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 Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 601 | driver->driver.bus = &host1x_bus_type; |
| 602 | driver->driver.owner = owner; |
Thierry Reding | b0d36da | 2017-03-22 19:15:18 +0100 | [diff] [blame] | 603 | driver->driver.probe = host1x_device_probe; |
| 604 | driver->driver.remove = host1x_device_remove; |
| 605 | driver->driver.shutdown = host1x_device_shutdown; |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 606 | |
| 607 | return driver_register(&driver->driver); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 608 | } |
Thierry Reding | f4c5cf8 | 2014-12-18 15:29:14 +0100 | [diff] [blame] | 609 | EXPORT_SYMBOL(host1x_driver_register_full); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 610 | |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 611 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 618 | void host1x_driver_unregister(struct host1x_driver *driver) |
| 619 | { |
Thierry Reding | e3e7081 | 2015-08-24 14:51:04 +0200 | [diff] [blame] | 620 | driver_unregister(&driver->driver); |
| 621 | |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 622 | mutex_lock(&drivers_lock); |
| 623 | list_del_init(&driver->list); |
| 624 | mutex_unlock(&drivers_lock); |
| 625 | } |
| 626 | EXPORT_SYMBOL(host1x_driver_unregister); |
| 627 | |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 628 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 639 | int 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 Reding | 0c7dfd3 | 2014-05-22 11:12:17 +0200 | [diff] [blame] | 647 | err = host1x_add_client(host1x, client); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 648 | 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 | } |
| 662 | EXPORT_SYMBOL(host1x_client_register); |
| 663 | |
Thierry Reding | 466749f | 2017-04-10 12:27:01 +0200 | [diff] [blame] | 664 | /** |
| 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 Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 671 | int 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 Reding | 0c7dfd3 | 2014-05-22 11:12:17 +0200 | [diff] [blame] | 680 | err = host1x_del_client(host1x, client); |
Thierry Reding | 776dc38 | 2013-10-14 14:43:22 +0200 | [diff] [blame] | 681 | 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 | } |
| 701 | EXPORT_SYMBOL(host1x_client_unregister); |