drivers/staging/imx-drm/imx-drm-core.c

   1 /*
   2  * Freescale i.MX drm driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/device.h>
  18 #include <linux/platform_device.h>
  19 #include <drm/drmP.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_crtc_helper.h>
  22 #include <linux/fb.h>
  23 #include <linux/module.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25 #include <drm/drm_fb_cma_helper.h>
  26
  27 #include "imx-drm.h"
  28
  29 #define MAX_CRTC        4
  30
  31 struct crtc_cookie {
  32         void *cookie;
  33         int id;
  34         struct list_head list;
  35 };
  36
  37 struct imx_drm_device {
  38         struct drm_device                       *drm;
  39         struct device                           *dev;
  40         struct list_head                        crtc_list;
  41         struct list_head                        encoder_list;
  42         struct list_head                        connector_list;
  43         struct mutex                            mutex;
  44         int                                     pipes;
  45         struct drm_fbdev_cma                    *fbhelper;
  46 };
  47
  48 struct imx_drm_crtc {
  49         struct drm_crtc                         *crtc;
  50         struct list_head                        list;
  51         struct imx_drm_device                   *imxdrm;
  52         int                                     pipe;
  53         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
  54         struct module                           *owner;
  55         struct crtc_cookie                      cookie;
  56 };
  57
  58 struct imx_drm_encoder {
  59         struct drm_encoder                      *encoder;
  60         struct list_head                        list;
  61         struct module                           *owner;
  62         struct list_head                        possible_crtcs;
  63 };
  64
  65 struct imx_drm_connector {
  66         struct drm_connector                    *connector;
  67         struct list_head                        list;
  68         struct module                           *owner;
  69 };
  70
  71 static void imx_drm_driver_lastclose(struct drm_device *drm)
  72 {
  73         struct imx_drm_device *imxdrm = drm->dev_private;
  74
  75         if (imxdrm->fbhelper)
  76                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  77 }
  78
  79 static int imx_drm_driver_unload(struct drm_device *drm)
  80 {
  81         struct imx_drm_device *imxdrm = drm->dev_private;
  82
  83         imx_drm_device_put();
  84
  85         drm_mode_config_cleanup(imxdrm->drm);
  86         drm_kms_helper_poll_fini(imxdrm->drm);
  87
  88         return 0;
  89 }
  90
  91 /*
  92  * We don't care at all for crtc numbers, but the core expects the
  93  * crtcs to be numbered
  94  */
  95 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
  96                 int num)
  97 {
  98         struct imx_drm_crtc *imx_drm_crtc;
  99
 100         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
 101                 if (imx_drm_crtc->pipe == num)
 102                         return imx_drm_crtc;
 103         return NULL;
 104 }
 105
 106 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
 107                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 108 {
 109         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 110         struct imx_drm_crtc *imx_crtc;
 111         struct imx_drm_crtc_helper_funcs *helper;
 112
 113         mutex_lock(&imxdrm->mutex);
 114
 115         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
 116                 if (imx_crtc->crtc == crtc)
 117                         goto found;
 118
 119         mutex_unlock(&imxdrm->mutex);
 120
 121         return -EINVAL;
 122 found:
 123         mutex_unlock(&imxdrm->mutex);
 124
 125         helper = &imx_crtc->imx_drm_helper_funcs;
 126         if (helper->set_interface_pix_fmt)
 127                 return helper->set_interface_pix_fmt(crtc,
 128                                 encoder_type, interface_pix_fmt,
 129                                 hsync_pin, vsync_pin);
 130         return 0;
 131 }
 132 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
 133
 134 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
 135                 u32 interface_pix_fmt)
 136 {
 137         return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
 138                                               interface_pix_fmt, 2, 3);
 139 }
 140 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
 141
 142 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 143 {
 144         return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 145 }
 146 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 147
 148 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 149 {
 150         drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 151 }
 152 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 153
 154 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 155 {
 156         drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 157 }
 158 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 159
 160 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 161 {
 162         struct imx_drm_device *imxdrm = drm->dev_private;
 163         struct imx_drm_crtc *imx_drm_crtc;
 164         int ret;
 165
 166         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 167         if (!imx_drm_crtc)
 168                 return -EINVAL;
 169
 170         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 171                 return -ENOSYS;
 172
 173         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 174                         imx_drm_crtc->crtc);
 175
 176         return ret;
 177 }
 178
 179 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 180 {
 181         struct imx_drm_device *imxdrm = drm->dev_private;
 182         struct imx_drm_crtc *imx_drm_crtc;
 183
 184         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 185         if (!imx_drm_crtc)
 186                 return;
 187
 188         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 189                 return;
 190
 191         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 192 }
 193
 194 static const struct file_operations imx_drm_driver_fops = {
 195         .owner = THIS_MODULE,
 196         .open = drm_open,
 197         .release = drm_release,
 198         .unlocked_ioctl = drm_ioctl,
 199         .mmap = drm_gem_cma_mmap,
 200         .poll = drm_poll,
 201         .read = drm_read,
 202         .llseek = noop_llseek,
 203 };
 204
 205 static struct imx_drm_device *imx_drm_device;
 206
 207 static struct imx_drm_device *__imx_drm_device(void)
 208 {
 209         return imx_drm_device;
 210 }
 211
 212 struct drm_device *imx_drm_device_get(void)
 213 {
 214         struct imx_drm_device *imxdrm = __imx_drm_device();
 215         struct imx_drm_encoder *enc;
 216         struct imx_drm_connector *con;
 217         struct imx_drm_crtc *crtc;
 218
 219         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 220                 if (!try_module_get(enc->owner)) {
 221                         dev_err(imxdrm->dev, "could not get module %s\n",
 222                                         module_name(enc->owner));
 223                         goto unwind_enc;
 224                 }
 225         }
 226
 227         list_for_each_entry(con, &imxdrm->connector_list, list) {
 228                 if (!try_module_get(con->owner)) {
 229                         dev_err(imxdrm->dev, "could not get module %s\n",
 230                                         module_name(con->owner));
 231                         goto unwind_con;
 232                 }
 233         }
 234
 235         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 236                 if (!try_module_get(crtc->owner)) {
 237                         dev_err(imxdrm->dev, "could not get module %s\n",
 238                                         module_name(crtc->owner));
 239                         goto unwind_crtc;
 240                 }
 241         }
 242
 243         return imxdrm->drm;
 244
 245 unwind_crtc:
 246         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 247                 module_put(crtc->owner);
 248 unwind_con:
 249         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 250                 module_put(con->owner);
 251 unwind_enc:
 252         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 253                 module_put(enc->owner);
 254
 255         mutex_unlock(&imxdrm->mutex);
 256
 257         return NULL;
 258
 259 }
 260 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 261
 262 void imx_drm_device_put(void)
 263 {
 264         struct imx_drm_device *imxdrm = __imx_drm_device();
 265         struct imx_drm_encoder *enc;
 266         struct imx_drm_connector *con;
 267         struct imx_drm_crtc *crtc;
 268
 269         mutex_lock(&imxdrm->mutex);
 270
 271         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 272                 module_put(crtc->owner);
 273
 274         list_for_each_entry(con, &imxdrm->connector_list, list)
 275                 module_put(con->owner);
 276
 277         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 278                 module_put(enc->owner);
 279
 280         mutex_unlock(&imxdrm->mutex);
 281 }
 282 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 283
 284 static int drm_mode_group_reinit(struct drm_device *dev)
 285 {
 286         struct drm_mode_group *group = &dev->primary->mode_group;
 287         uint32_t *id_list = group->id_list;
 288         int ret;
 289
 290         ret = drm_mode_group_init_legacy_group(dev, group);
 291         if (ret < 0)
 292                 return ret;
 293
 294         kfree(id_list);
 295         return 0;
 296 }
 297
 298 /*
 299  * register an encoder to the drm core
 300  */
 301 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 302 {
 303         struct imx_drm_device *imxdrm = __imx_drm_device();
 304
 305         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 306
 307         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 308                         imx_drm_encoder->encoder->funcs,
 309                         imx_drm_encoder->encoder->encoder_type);
 310
 311         drm_mode_group_reinit(imxdrm->drm);
 312
 313         return 0;
 314 }
 315
 316 /*
 317  * unregister an encoder from the drm core
 318  */
 319 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 320                 *imx_drm_encoder)
 321 {
 322         struct imx_drm_device *imxdrm = __imx_drm_device();
 323
 324         drm_encoder_cleanup(imx_drm_encoder->encoder);
 325
 326         drm_mode_group_reinit(imxdrm->drm);
 327 }
 328
 329 /*
 330  * register a connector to the drm core
 331  */
 332 static int imx_drm_connector_register(
 333                 struct imx_drm_connector *imx_drm_connector)
 334 {
 335         struct imx_drm_device *imxdrm = __imx_drm_device();
 336
 337         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 338                         imx_drm_connector->connector->funcs,
 339                         imx_drm_connector->connector->connector_type);
 340         drm_mode_group_reinit(imxdrm->drm);
 341
 342         return drm_sysfs_connector_add(imx_drm_connector->connector);
 343 }
 344
 345 /*
 346  * unregister a connector from the drm core
 347  */
 348 static void imx_drm_connector_unregister(
 349                 struct imx_drm_connector *imx_drm_connector)
 350 {
 351         struct imx_drm_device *imxdrm = __imx_drm_device();
 352
 353         drm_sysfs_connector_remove(imx_drm_connector->connector);
 354         drm_connector_cleanup(imx_drm_connector->connector);
 355
 356         drm_mode_group_reinit(imxdrm->drm);
 357 }
 358
 359 /*
 360  * register a crtc to the drm core
 361  */
 362 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 363 {
 364         struct imx_drm_device *imxdrm = __imx_drm_device();
 365         int ret;
 366
 367         drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 368                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 369         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 370         if (ret)
 371                 return ret;
 372
 373         drm_crtc_helper_add(imx_drm_crtc->crtc,
 374                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 375
 376         drm_mode_group_reinit(imxdrm->drm);
 377
 378         return 0;
 379 }
 380
 381 /*
 382  * Called by the CRTC driver when all CRTCs are registered. This
 383  * puts all the pieces together and initializes the driver.
 384  * Once this is called no more CRTCs can be registered since
 385  * the drm core has hardcoded the number of crtcs in several
 386  * places.
 387  */
 388 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 389 {
 390         struct imx_drm_device *imxdrm = __imx_drm_device();
 391         int ret;
 392
 393         imxdrm->drm = drm;
 394
 395         drm->dev_private = imxdrm;
 396
 397         /*
 398          * enable drm irq mode.
 399          * - with irq_enabled = 1, we can use the vblank feature.
 400          *
 401          * P.S. note that we wouldn't use drm irq handler but
 402          *      just specific driver own one instead because
 403          *      drm framework supports only one irq handler and
 404          *      drivers can well take care of their interrupts
 405          */
 406         drm->irq_enabled = 1;
 407
 408         drm_mode_config_init(drm);
 409         imx_drm_mode_config_init(drm);
 410
 411         mutex_lock(&imxdrm->mutex);
 412
 413         drm_kms_helper_poll_init(imxdrm->drm);
 414
 415         /* setup the grouping for the legacy output */
 416         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 417                         &imxdrm->drm->primary->mode_group);
 418         if (ret)
 419                 goto err_init;
 420
 421         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 422         if (ret)
 423                 goto err_init;
 424
 425         /*
 426          * with vblank_disable_allowed = 1, vblank interrupt will be disabled
 427          * by drm timer once a current process gives up ownership of
 428          * vblank event.(after drm_vblank_put function is called)
 429          */
 430         imxdrm->drm->vblank_disable_allowed = 1;
 431
 432         if (!imx_drm_device_get())
 433                 ret = -EINVAL;
 434
 435         ret = 0;
 436
 437 err_init:
 438         mutex_unlock(&imxdrm->mutex);
 439
 440         return ret;
 441 }
 442
 443 static void imx_drm_update_possible_crtcs(void)
 444 {
 445         struct imx_drm_device *imxdrm = __imx_drm_device();
 446         struct imx_drm_crtc *imx_drm_crtc;
 447         struct imx_drm_encoder *enc;
 448         struct crtc_cookie *cookie;
 449
 450         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 451                 u32 possible_crtcs = 0;
 452
 453                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 454                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 455                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 456                                                 imx_drm_crtc->cookie.id == cookie->id) {
 457                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 458                                 }
 459                         }
 460                 }
 461                 enc->encoder->possible_crtcs = possible_crtcs;
 462                 enc->encoder->possible_clones = possible_crtcs;
 463         }
 464 }
 465
 466 /*
 467  * imx_drm_add_crtc - add a new crtc
 468  *
 469  * The return value if !NULL is a cookie for the caller to pass to
 470  * imx_drm_remove_crtc later.
 471  */
 472 int imx_drm_add_crtc(struct drm_crtc *crtc,
 473                 struct imx_drm_crtc **new_crtc,
 474                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 475                 struct module *owner, void *cookie, int id)
 476 {
 477         struct imx_drm_device *imxdrm = __imx_drm_device();
 478         struct imx_drm_crtc *imx_drm_crtc;
 479         int ret;
 480
 481         mutex_lock(&imxdrm->mutex);
 482
 483         if (imxdrm->drm->open_count) {
 484                 ret = -EBUSY;
 485                 goto err_busy;
 486         }
 487
 488         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 489         if (!imx_drm_crtc) {
 490                 ret = -ENOMEM;
 491                 goto err_alloc;
 492         }
 493
 494         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 495         imx_drm_crtc->pipe = imxdrm->pipes++;
 496         imx_drm_crtc->cookie.cookie = cookie;
 497         imx_drm_crtc->cookie.id = id;
 498
 499         imx_drm_crtc->crtc = crtc;
 500         imx_drm_crtc->imxdrm = imxdrm;
 501
 502         imx_drm_crtc->owner = owner;
 503
 504         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 505
 506         *new_crtc = imx_drm_crtc;
 507
 508         ret = imx_drm_crtc_register(imx_drm_crtc);
 509         if (ret)
 510                 goto err_register;
 511
 512         imx_drm_update_possible_crtcs();
 513
 514         mutex_unlock(&imxdrm->mutex);
 515
 516         return 0;
 517
 518 err_register:
 519         kfree(imx_drm_crtc);
 520 err_alloc:
 521 err_busy:
 522         mutex_unlock(&imxdrm->mutex);
 523         return ret;
 524 }
 525 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 526
 527 /*
 528  * imx_drm_remove_crtc - remove a crtc
 529  */
 530 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 531 {
 532         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 533
 534         mutex_lock(&imxdrm->mutex);
 535
 536         drm_crtc_cleanup(imx_drm_crtc->crtc);
 537
 538         list_del(&imx_drm_crtc->list);
 539
 540         drm_mode_group_reinit(imxdrm->drm);
 541
 542         mutex_unlock(&imxdrm->mutex);
 543
 544         kfree(imx_drm_crtc);
 545
 546         return 0;
 547 }
 548 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 549
 550 /*
 551  * imx_drm_add_encoder - add a new encoder
 552  */
 553 int imx_drm_add_encoder(struct drm_encoder *encoder,
 554                 struct imx_drm_encoder **newenc, struct module *owner)
 555 {
 556         struct imx_drm_device *imxdrm = __imx_drm_device();
 557         struct imx_drm_encoder *imx_drm_encoder;
 558         int ret;
 559
 560         mutex_lock(&imxdrm->mutex);
 561
 562         if (imxdrm->drm->open_count) {
 563                 ret = -EBUSY;
 564                 goto err_busy;
 565         }
 566
 567         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 568         if (!imx_drm_encoder) {
 569                 ret = -ENOMEM;
 570                 goto err_alloc;
 571         }
 572
 573         imx_drm_encoder->encoder = encoder;
 574         imx_drm_encoder->owner = owner;
 575
 576         ret = imx_drm_encoder_register(imx_drm_encoder);
 577         if (ret) {
 578                 ret = -ENOMEM;
 579                 goto err_register;
 580         }
 581
 582         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 583
 584         *newenc = imx_drm_encoder;
 585
 586         mutex_unlock(&imxdrm->mutex);
 587
 588         return 0;
 589
 590 err_register:
 591         kfree(imx_drm_encoder);
 592 err_alloc:
 593 err_busy:
 594         mutex_unlock(&imxdrm->mutex);
 595
 596         return ret;
 597 }
 598 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 599
 600 int imx_drm_encoder_add_possible_crtcs(
 601                 struct imx_drm_encoder *imx_drm_encoder,
 602                 struct device_node *np)
 603 {
 604         struct imx_drm_device *imxdrm = __imx_drm_device();
 605         struct of_phandle_args args;
 606         struct crtc_cookie *c;
 607         int ret = 0;
 608         int i;
 609
 610         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 611                 return -EBUSY;
 612
 613         for (i = 0; !ret; i++) {
 614                 ret = of_parse_phandle_with_args(np, "crtcs",
 615                                 "#crtc-cells", i, &args);
 616                 if (ret < 0)
 617                         break;
 618
 619                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 620                 if (!c) {
 621                         of_node_put(args.np);
 622                         return -ENOMEM;
 623                 }
 624
 625                 c->cookie = args.np;
 626                 c->id = args.args_count > 0 ? args.args[0] : 0;
 627
 628                 of_node_put(args.np);
 629
 630                 mutex_lock(&imxdrm->mutex);
 631
 632                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 633
 634                 mutex_unlock(&imxdrm->mutex);
 635         }
 636
 637         imx_drm_update_possible_crtcs();
 638
 639         return 0;
 640 }
 641 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 642
 643 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 644                 struct drm_crtc *crtc)
 645 {
 646         struct imx_drm_device *imxdrm = __imx_drm_device();
 647         struct imx_drm_crtc *imx_crtc;
 648         int i = 0;
 649
 650         mutex_lock(&imxdrm->mutex);
 651
 652         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 653                 if (imx_crtc->crtc == crtc)
 654                         goto found;
 655                 i++;
 656         }
 657
 658         mutex_unlock(&imxdrm->mutex);
 659
 660         return -EINVAL;
 661 found:
 662         mutex_unlock(&imxdrm->mutex);
 663
 664         return i;
 665 }
 666 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 667
 668 /*
 669  * imx_drm_remove_encoder - remove an encoder
 670  */
 671 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 672 {
 673         struct imx_drm_device *imxdrm = __imx_drm_device();
 674         struct crtc_cookie *c, *tmp;
 675
 676         mutex_lock(&imxdrm->mutex);
 677
 678         imx_drm_encoder_unregister(imx_drm_encoder);
 679
 680         list_del(&imx_drm_encoder->list);
 681
 682         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 683                         list)
 684                 kfree(c);
 685
 686         mutex_unlock(&imxdrm->mutex);
 687
 688         kfree(imx_drm_encoder);
 689
 690         return 0;
 691 }
 692 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 693
 694 /*
 695  * imx_drm_add_connector - add a connector
 696  */
 697 int imx_drm_add_connector(struct drm_connector *connector,
 698                 struct imx_drm_connector **new_con,
 699                 struct module *owner)
 700 {
 701         struct imx_drm_device *imxdrm = __imx_drm_device();
 702         struct imx_drm_connector *imx_drm_connector;
 703         int ret;
 704
 705         mutex_lock(&imxdrm->mutex);
 706
 707         if (imxdrm->drm->open_count) {
 708                 ret = -EBUSY;
 709                 goto err_busy;
 710         }
 711
 712         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 713         if (!imx_drm_connector) {
 714                 ret = -ENOMEM;
 715                 goto err_alloc;
 716         }
 717
 718         imx_drm_connector->connector = connector;
 719         imx_drm_connector->owner = owner;
 720
 721         ret = imx_drm_connector_register(imx_drm_connector);
 722         if (ret)
 723                 goto err_register;
 724
 725         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 726
 727         *new_con = imx_drm_connector;
 728
 729         mutex_unlock(&imxdrm->mutex);
 730
 731         return 0;
 732
 733 err_register:
 734         kfree(imx_drm_connector);
 735 err_alloc:
 736 err_busy:
 737         mutex_unlock(&imxdrm->mutex);
 738
 739         return ret;
 740 }
 741 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 742
 743 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 744 {
 745         struct imx_drm_device *imxdrm = __imx_drm_device();
 746
 747         imxdrm->fbhelper = fbdev_helper;
 748 }
 749 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 750
 751 /*
 752  * imx_drm_remove_connector - remove a connector
 753  */
 754 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 755 {
 756         struct imx_drm_device *imxdrm = __imx_drm_device();
 757
 758         mutex_lock(&imxdrm->mutex);
 759
 760         imx_drm_connector_unregister(imx_drm_connector);
 761
 762         list_del(&imx_drm_connector->list);
 763
 764         mutex_unlock(&imxdrm->mutex);
 765
 766         kfree(imx_drm_connector);
 767
 768         return 0;
 769 }
 770 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 771
 772 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 773         /* none so far */
 774 };
 775
 776 static struct drm_driver imx_drm_driver = {
 777         .driver_features        = DRIVER_MODESET | DRIVER_GEM,
 778         .load                   = imx_drm_driver_load,
 779         .unload                 = imx_drm_driver_unload,
 780         .lastclose              = imx_drm_driver_lastclose,
 781         .gem_free_object        = drm_gem_cma_free_object,
 782         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 783         .dumb_create            = drm_gem_cma_dumb_create,
 784         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 785         .dumb_destroy           = drm_gem_dumb_destroy,
 786
 787         .get_vblank_counter     = drm_vblank_count,
 788         .enable_vblank          = imx_drm_enable_vblank,
 789         .disable_vblank         = imx_drm_disable_vblank,
 790         .ioctls                 = imx_drm_ioctls,
 791         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 792         .fops                   = &imx_drm_driver_fops,
 793         .name                   = "imx-drm",
 794         .desc                   = "i.MX DRM graphics",
 795         .date                   = "20120507",
 796         .major                  = 1,
 797         .minor                  = 0,
 798         .patchlevel             = 0,
 799 };
 800
 801 static int imx_drm_platform_probe(struct platform_device *pdev)
 802 {
 803         imx_drm_device->dev = &pdev->dev;
 804
 805         return drm_platform_init(&imx_drm_driver, pdev);
 806 }
 807
 808 static int imx_drm_platform_remove(struct platform_device *pdev)
 809 {
 810         drm_platform_exit(&imx_drm_driver, pdev);
 811
 812         return 0;
 813 }
 814
 815 static struct platform_driver imx_drm_pdrv = {
 816         .probe          = imx_drm_platform_probe,
 817         .remove         = imx_drm_platform_remove,
 818         .driver         = {
 819                 .owner  = THIS_MODULE,
 820                 .name   = "imx-drm",
 821         },
 822 };
 823
 824 static struct platform_device *imx_drm_pdev;
 825
 826 static int __init imx_drm_init(void)
 827 {
 828         int ret;
 829
 830         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 831         if (!imx_drm_device)
 832                 return -ENOMEM;
 833
 834         mutex_init(&imx_drm_device->mutex);
 835         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 836         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 837         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 838
 839         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 840         if (!imx_drm_pdev) {
 841                 ret = -EINVAL;
 842                 goto err_pdev;
 843         }
 844
 845         imx_drm_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32),
 846
 847         ret = platform_driver_register(&imx_drm_pdrv);
 848         if (ret)
 849                 goto err_pdrv;
 850
 851         return 0;
 852
 853 err_pdrv:
 854         platform_device_unregister(imx_drm_pdev);
 855 err_pdev:
 856         kfree(imx_drm_device);
 857
 858         return ret;
 859 }
 860
 861 static void __exit imx_drm_exit(void)
 862 {
 863         platform_device_unregister(imx_drm_pdev);
 864         platform_driver_unregister(&imx_drm_pdrv);
 865
 866         kfree(imx_drm_device);
 867 }
 868
 869 module_init(imx_drm_init);
 870 module_exit(imx_drm_exit);
 871
 872 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 873 MODULE_DESCRIPTION("i.MX drm driver core");
 874 MODULE_LICENSE("GPL");