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                                     references;
  45         int                                     pipes;
  46         struct drm_fbdev_cma                    *fbhelper;
  47 };
  48
  49 struct imx_drm_crtc {
  50         struct drm_crtc                         *crtc;
  51         struct list_head                        list;
  52         struct imx_drm_device                   *imxdrm;
  53         int                                     pipe;
  54         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
  55         struct module                           *owner;
  56         struct crtc_cookie                      cookie;
  57 };
  58
  59 struct imx_drm_encoder {
  60         struct drm_encoder                      *encoder;
  61         struct list_head                        list;
  62         struct module                           *owner;
  63         struct list_head                        possible_crtcs;
  64 };
  65
  66 struct imx_drm_connector {
  67         struct drm_connector                    *connector;
  68         struct list_head                        list;
  69         struct module                           *owner;
  70 };
  71
  72 static int imx_drm_driver_firstopen(struct drm_device *drm)
  73 {
  74         if (!imx_drm_device_get())
  75                 return -EINVAL;
  76
  77         return 0;
  78 }
  79
  80 static void imx_drm_driver_lastclose(struct drm_device *drm)
  81 {
  82         struct imx_drm_device *imxdrm = drm->dev_private;
  83
  84         if (imxdrm->fbhelper)
  85                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  86
  87         imx_drm_device_put();
  88 }
  89
  90 static int imx_drm_driver_unload(struct drm_device *drm)
  91 {
  92         struct imx_drm_device *imxdrm = drm->dev_private;
  93
  94         drm_mode_config_cleanup(imxdrm->drm);
  95         drm_kms_helper_poll_fini(imxdrm->drm);
  96
  97         return 0;
  98 }
  99
 100 /*
 101  * We don't care at all for crtc numbers, but the core expects the
 102  * crtcs to be numbered
 103  */
 104 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
 105                 int num)
 106 {
 107         struct imx_drm_crtc *imx_drm_crtc;
 108
 109         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
 110                 if (imx_drm_crtc->pipe == num)
 111                         return imx_drm_crtc;
 112         return NULL;
 113 }
 114
 115 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
 116                 u32 interface_pix_fmt)
 117 {
 118         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 119         struct imx_drm_crtc *imx_crtc;
 120         struct imx_drm_crtc_helper_funcs *helper;
 121
 122         mutex_lock(&imxdrm->mutex);
 123
 124         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
 125                 if (imx_crtc->crtc == crtc)
 126                         goto found;
 127
 128         mutex_unlock(&imxdrm->mutex);
 129
 130         return -EINVAL;
 131 found:
 132         mutex_unlock(&imxdrm->mutex);
 133
 134         helper = &imx_crtc->imx_drm_helper_funcs;
 135         if (helper->set_interface_pix_fmt)
 136                 return helper->set_interface_pix_fmt(crtc,
 137                                 encoder_type, interface_pix_fmt);
 138         return 0;
 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         .fasync = drm_fasync,
 202         .read = drm_read,
 203         .llseek = noop_llseek,
 204 };
 205
 206 static struct imx_drm_device *imx_drm_device;
 207
 208 static struct imx_drm_device *__imx_drm_device(void)
 209 {
 210         return imx_drm_device;
 211 }
 212
 213 struct drm_device *imx_drm_device_get(void)
 214 {
 215         struct imx_drm_device *imxdrm = __imx_drm_device();
 216         struct imx_drm_encoder *enc;
 217         struct imx_drm_connector *con;
 218         struct imx_drm_crtc *crtc;
 219
 220         mutex_lock(&imxdrm->mutex);
 221
 222         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 223                 if (!try_module_get(enc->owner)) {
 224                         dev_err(imxdrm->dev, "could not get module %s\n",
 225                                         module_name(enc->owner));
 226                         goto unwind_enc;
 227                 }
 228         }
 229
 230         list_for_each_entry(con, &imxdrm->connector_list, list) {
 231                 if (!try_module_get(con->owner)) {
 232                         dev_err(imxdrm->dev, "could not get module %s\n",
 233                                         module_name(con->owner));
 234                         goto unwind_con;
 235                 }
 236         }
 237
 238         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 239                 if (!try_module_get(crtc->owner)) {
 240                         dev_err(imxdrm->dev, "could not get module %s\n",
 241                                         module_name(crtc->owner));
 242                         goto unwind_crtc;
 243                 }
 244         }
 245
 246         imxdrm->references++;
 247
 248         mutex_unlock(&imxdrm->mutex);
 249
 250         return imxdrm->drm;
 251
 252 unwind_crtc:
 253         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 254                 module_put(crtc->owner);
 255 unwind_con:
 256         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 257                 module_put(con->owner);
 258 unwind_enc:
 259         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 260                 module_put(enc->owner);
 261
 262         mutex_unlock(&imxdrm->mutex);
 263
 264         return NULL;
 265
 266 }
 267 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 268
 269 void imx_drm_device_put(void)
 270 {
 271         struct imx_drm_device *imxdrm = __imx_drm_device();
 272         struct imx_drm_encoder *enc;
 273         struct imx_drm_connector *con;
 274         struct imx_drm_crtc *crtc;
 275
 276         mutex_lock(&imxdrm->mutex);
 277
 278         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 279                 module_put(crtc->owner);
 280
 281         list_for_each_entry(con, &imxdrm->connector_list, list)
 282                 module_put(con->owner);
 283
 284         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 285                 module_put(enc->owner);
 286
 287         imxdrm->references--;
 288
 289         mutex_unlock(&imxdrm->mutex);
 290 }
 291 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 292
 293 static int drm_mode_group_reinit(struct drm_device *dev)
 294 {
 295         struct drm_mode_group *group = &dev->primary->mode_group;
 296         uint32_t *id_list = group->id_list;
 297         int ret;
 298
 299         ret = drm_mode_group_init_legacy_group(dev, group);
 300         if (ret < 0)
 301                 return ret;
 302
 303         kfree(id_list);
 304         return 0;
 305 }
 306
 307 /*
 308  * register an encoder to the drm core
 309  */
 310 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 311 {
 312         struct imx_drm_device *imxdrm = __imx_drm_device();
 313
 314         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 315
 316         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 317                         imx_drm_encoder->encoder->funcs,
 318                         imx_drm_encoder->encoder->encoder_type);
 319
 320         drm_mode_group_reinit(imxdrm->drm);
 321
 322         return 0;
 323 }
 324
 325 /*
 326  * unregister an encoder from the drm core
 327  */
 328 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 329                 *imx_drm_encoder)
 330 {
 331         struct imx_drm_device *imxdrm = __imx_drm_device();
 332
 333         drm_encoder_cleanup(imx_drm_encoder->encoder);
 334
 335         drm_mode_group_reinit(imxdrm->drm);
 336 }
 337
 338 /*
 339  * register a connector to the drm core
 340  */
 341 static int imx_drm_connector_register(
 342                 struct imx_drm_connector *imx_drm_connector)
 343 {
 344         struct imx_drm_device *imxdrm = __imx_drm_device();
 345
 346         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 347                         imx_drm_connector->connector->funcs,
 348                         imx_drm_connector->connector->connector_type);
 349         drm_mode_group_reinit(imxdrm->drm);
 350
 351         return drm_sysfs_connector_add(imx_drm_connector->connector);
 352 }
 353
 354 /*
 355  * unregister a connector from the drm core
 356  */
 357 static void imx_drm_connector_unregister(
 358                 struct imx_drm_connector *imx_drm_connector)
 359 {
 360         struct imx_drm_device *imxdrm = __imx_drm_device();
 361
 362         drm_sysfs_connector_remove(imx_drm_connector->connector);
 363         drm_connector_cleanup(imx_drm_connector->connector);
 364
 365         drm_mode_group_reinit(imxdrm->drm);
 366 }
 367
 368 /*
 369  * register a crtc to the drm core
 370  */
 371 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 372 {
 373         struct imx_drm_device *imxdrm = __imx_drm_device();
 374         int ret;
 375
 376         drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 377                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 378         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 379         if (ret)
 380                 return ret;
 381
 382         drm_crtc_helper_add(imx_drm_crtc->crtc,
 383                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 384
 385         drm_mode_group_reinit(imxdrm->drm);
 386
 387         return 0;
 388 }
 389
 390 /*
 391  * Called by the CRTC driver when all CRTCs are registered. This
 392  * puts all the pieces together and initializes the driver.
 393  * Once this is called no more CRTCs can be registered since
 394  * the drm core has hardcoded the number of crtcs in several
 395  * places.
 396  */
 397 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 398 {
 399         struct imx_drm_device *imxdrm = __imx_drm_device();
 400         int ret;
 401
 402         imxdrm->drm = drm;
 403
 404         drm->dev_private = imxdrm;
 405
 406         /*
 407          * enable drm irq mode.
 408          * - with irq_enabled = 1, we can use the vblank feature.
 409          *
 410          * P.S. note that we wouldn't use drm irq handler but
 411          *      just specific driver own one instead because
 412          *      drm framework supports only one irq handler and
 413          *      drivers can well take care of their interrupts
 414          */
 415         drm->irq_enabled = 1;
 416
 417         drm_mode_config_init(drm);
 418         imx_drm_mode_config_init(drm);
 419
 420         mutex_lock(&imxdrm->mutex);
 421
 422         drm_kms_helper_poll_init(imxdrm->drm);
 423
 424         /* setup the grouping for the legacy output */
 425         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 426                         &imxdrm->drm->primary->mode_group);
 427         if (ret)
 428                 goto err_init;
 429
 430         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 431         if (ret)
 432                 goto err_init;
 433
 434         /*
 435          * with vblank_disable_allowed = 1, vblank interrupt will be disabled
 436          * by drm timer once a current process gives up ownership of
 437          * vblank event.(after drm_vblank_put function is called)
 438          */
 439         imxdrm->drm->vblank_disable_allowed = 1;
 440
 441         ret = 0;
 442
 443 err_init:
 444         mutex_unlock(&imxdrm->mutex);
 445
 446         return ret;
 447 }
 448
 449 static void imx_drm_update_possible_crtcs(void)
 450 {
 451         struct imx_drm_device *imxdrm = __imx_drm_device();
 452         struct imx_drm_crtc *imx_drm_crtc;
 453         struct imx_drm_encoder *enc;
 454         struct crtc_cookie *cookie;
 455
 456         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 457                 u32 possible_crtcs = 0;
 458
 459                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 460                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 461                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 462                                                 imx_drm_crtc->cookie.id == cookie->id) {
 463                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 464                                 }
 465                         }
 466                 }
 467                 enc->encoder->possible_crtcs = possible_crtcs;
 468                 enc->encoder->possible_clones = possible_crtcs;
 469         }
 470 }
 471
 472 /*
 473  * imx_drm_add_crtc - add a new crtc
 474  *
 475  * The return value if !NULL is a cookie for the caller to pass to
 476  * imx_drm_remove_crtc later.
 477  */
 478 int imx_drm_add_crtc(struct drm_crtc *crtc,
 479                 struct imx_drm_crtc **new_crtc,
 480                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 481                 struct module *owner, void *cookie, int id)
 482 {
 483         struct imx_drm_device *imxdrm = __imx_drm_device();
 484         struct imx_drm_crtc *imx_drm_crtc;
 485         const struct drm_crtc_funcs *crtc_funcs;
 486         int ret;
 487
 488         mutex_lock(&imxdrm->mutex);
 489
 490         if (imxdrm->references) {
 491                 ret = -EBUSY;
 492                 goto err_busy;
 493         }
 494
 495         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 496         if (!imx_drm_crtc) {
 497                 ret = -ENOMEM;
 498                 goto err_alloc;
 499         }
 500
 501         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 502         imx_drm_crtc->pipe = imxdrm->pipes++;
 503         imx_drm_crtc->cookie.cookie = cookie;
 504         imx_drm_crtc->cookie.id = id;
 505
 506         crtc_funcs = imx_drm_helper_funcs->crtc_funcs;
 507
 508         imx_drm_crtc->crtc = crtc;
 509         imx_drm_crtc->imxdrm = imxdrm;
 510
 511         imx_drm_crtc->owner = owner;
 512
 513         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 514
 515         *new_crtc = imx_drm_crtc;
 516
 517         ret = imx_drm_crtc_register(imx_drm_crtc);
 518         if (ret)
 519                 goto err_register;
 520
 521         imx_drm_update_possible_crtcs();
 522
 523         mutex_unlock(&imxdrm->mutex);
 524
 525         return 0;
 526
 527 err_register:
 528         kfree(imx_drm_crtc);
 529 err_alloc:
 530 err_busy:
 531         mutex_unlock(&imxdrm->mutex);
 532         return ret;
 533 }
 534 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 535
 536 /*
 537  * imx_drm_remove_crtc - remove a crtc
 538  */
 539 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 540 {
 541         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 542
 543         mutex_lock(&imxdrm->mutex);
 544
 545         drm_crtc_cleanup(imx_drm_crtc->crtc);
 546
 547         list_del(&imx_drm_crtc->list);
 548
 549         drm_mode_group_reinit(imxdrm->drm);
 550
 551         mutex_unlock(&imxdrm->mutex);
 552
 553         kfree(imx_drm_crtc);
 554
 555         return 0;
 556 }
 557 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 558
 559 /*
 560  * imx_drm_add_encoder - add a new encoder
 561  */
 562 int imx_drm_add_encoder(struct drm_encoder *encoder,
 563                 struct imx_drm_encoder **newenc, struct module *owner)
 564 {
 565         struct imx_drm_device *imxdrm = __imx_drm_device();
 566         struct imx_drm_encoder *imx_drm_encoder;
 567         int ret;
 568
 569         mutex_lock(&imxdrm->mutex);
 570
 571         if (imxdrm->references) {
 572                 ret = -EBUSY;
 573                 goto err_busy;
 574         }
 575
 576         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 577         if (!imx_drm_encoder) {
 578                 ret = -ENOMEM;
 579                 goto err_alloc;
 580         }
 581
 582         imx_drm_encoder->encoder = encoder;
 583         imx_drm_encoder->owner = owner;
 584
 585         ret = imx_drm_encoder_register(imx_drm_encoder);
 586         if (ret) {
 587                 kfree(imx_drm_encoder);
 588                 ret = -ENOMEM;
 589                 goto err_register;
 590         }
 591
 592         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 593
 594         *newenc = imx_drm_encoder;
 595
 596         mutex_unlock(&imxdrm->mutex);
 597
 598         return 0;
 599
 600 err_register:
 601         kfree(imx_drm_encoder);
 602 err_alloc:
 603 err_busy:
 604         mutex_unlock(&imxdrm->mutex);
 605
 606         return ret;
 607 }
 608 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 609
 610 int imx_drm_encoder_add_possible_crtcs(
 611                 struct imx_drm_encoder *imx_drm_encoder,
 612                 struct device_node *np)
 613 {
 614         struct imx_drm_device *imxdrm = __imx_drm_device();
 615         struct of_phandle_args args;
 616         struct crtc_cookie *c;
 617         int ret = 0;
 618         int i;
 619
 620         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 621                 return -EBUSY;
 622
 623         for (i = 0; !ret; i++) {
 624                 ret = of_parse_phandle_with_args(np, "crtcs",
 625                                 "#crtc-cells", i, &args);
 626                 if (ret < 0)
 627                         break;
 628
 629                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 630                 if (!c) {
 631                         of_node_put(args.np);
 632                         return -ENOMEM;
 633                 }
 634
 635                 c->cookie = args.np;
 636                 c->id = args.args_count > 0 ? args.args[0] : 0;
 637
 638                 of_node_put(args.np);
 639
 640                 mutex_lock(&imxdrm->mutex);
 641
 642                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 643
 644                 mutex_unlock(&imxdrm->mutex);
 645         }
 646
 647         imx_drm_update_possible_crtcs();
 648
 649         return 0;
 650 }
 651 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 652
 653 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 654                 struct drm_crtc *crtc)
 655 {
 656         struct imx_drm_device *imxdrm = __imx_drm_device();
 657         struct imx_drm_crtc *imx_crtc;
 658         int i = 0;
 659
 660         mutex_lock(&imxdrm->mutex);
 661
 662         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 663                 if (imx_crtc->crtc == crtc)
 664                         goto found;
 665                 i++;
 666         }
 667
 668         mutex_unlock(&imxdrm->mutex);
 669
 670         return -EINVAL;
 671 found:
 672         mutex_unlock(&imxdrm->mutex);
 673
 674         return i;
 675 }
 676
 677 /*
 678  * imx_drm_remove_encoder - remove an encoder
 679  */
 680 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 681 {
 682         struct imx_drm_device *imxdrm = __imx_drm_device();
 683         struct crtc_cookie *c, *tmp;
 684
 685         mutex_lock(&imxdrm->mutex);
 686
 687         imx_drm_encoder_unregister(imx_drm_encoder);
 688
 689         list_del(&imx_drm_encoder->list);
 690
 691         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 692                         list)
 693                 kfree(c);
 694
 695         mutex_unlock(&imxdrm->mutex);
 696
 697         kfree(imx_drm_encoder);
 698
 699         return 0;
 700 }
 701 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 702
 703 /*
 704  * imx_drm_add_connector - add a connector
 705  */
 706 int imx_drm_add_connector(struct drm_connector *connector,
 707                 struct imx_drm_connector **new_con,
 708                 struct module *owner)
 709 {
 710         struct imx_drm_device *imxdrm = __imx_drm_device();
 711         struct imx_drm_connector *imx_drm_connector;
 712         int ret;
 713
 714         mutex_lock(&imxdrm->mutex);
 715
 716         if (imxdrm->references) {
 717                 ret = -EBUSY;
 718                 goto err_busy;
 719         }
 720
 721         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 722         if (!imx_drm_connector) {
 723                 ret = -ENOMEM;
 724                 goto err_alloc;
 725         }
 726
 727         imx_drm_connector->connector = connector;
 728         imx_drm_connector->owner = owner;
 729
 730         ret = imx_drm_connector_register(imx_drm_connector);
 731         if (ret)
 732                 goto err_register;
 733
 734         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 735
 736         *new_con = imx_drm_connector;
 737
 738         mutex_unlock(&imxdrm->mutex);
 739
 740         return 0;
 741
 742 err_register:
 743         kfree(imx_drm_connector);
 744 err_alloc:
 745 err_busy:
 746         mutex_unlock(&imxdrm->mutex);
 747
 748         return ret;
 749 }
 750 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 751
 752 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 753 {
 754         struct imx_drm_device *imxdrm = __imx_drm_device();
 755
 756         imxdrm->fbhelper = fbdev_helper;
 757 }
 758 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 759
 760 /*
 761  * imx_drm_remove_connector - remove a connector
 762  */
 763 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 764 {
 765         struct imx_drm_device *imxdrm = __imx_drm_device();
 766
 767         mutex_lock(&imxdrm->mutex);
 768
 769         imx_drm_connector_unregister(imx_drm_connector);
 770
 771         list_del(&imx_drm_connector->list);
 772
 773         mutex_unlock(&imxdrm->mutex);
 774
 775         kfree(imx_drm_connector);
 776
 777         return 0;
 778 }
 779 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 780
 781 static struct drm_ioctl_desc imx_drm_ioctls[] = {
 782         /* none so far */
 783 };
 784
 785 static struct drm_driver imx_drm_driver = {
 786         .driver_features        = DRIVER_MODESET | DRIVER_GEM,
 787         .load                   = imx_drm_driver_load,
 788         .unload                 = imx_drm_driver_unload,
 789         .firstopen              = imx_drm_driver_firstopen,
 790         .lastclose              = imx_drm_driver_lastclose,
 791         .gem_free_object        = drm_gem_cma_free_object,
 792         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 793         .dumb_create            = drm_gem_cma_dumb_create,
 794         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 795         .dumb_destroy           = drm_gem_cma_dumb_destroy,
 796
 797         .get_vblank_counter     = drm_vblank_count,
 798         .enable_vblank          = imx_drm_enable_vblank,
 799         .disable_vblank         = imx_drm_disable_vblank,
 800         .ioctls                 = imx_drm_ioctls,
 801         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 802         .fops                   = &imx_drm_driver_fops,
 803         .name                   = "imx-drm",
 804         .desc                   = "i.MX DRM graphics",
 805         .date                   = "20120507",
 806         .major                  = 1,
 807         .minor                  = 0,
 808         .patchlevel             = 0,
 809 };
 810
 811 static int imx_drm_platform_probe(struct platform_device *pdev)
 812 {
 813         imx_drm_device->dev = &pdev->dev;
 814
 815         return drm_platform_init(&imx_drm_driver, pdev);
 816 }
 817
 818 static int imx_drm_platform_remove(struct platform_device *pdev)
 819 {
 820         drm_platform_exit(&imx_drm_driver, pdev);
 821
 822         return 0;
 823 }
 824
 825 static struct platform_driver imx_drm_pdrv = {
 826         .probe          = imx_drm_platform_probe,
 827         .remove         = imx_drm_platform_remove,
 828         .driver         = {
 829                 .owner  = THIS_MODULE,
 830                 .name   = "imx-drm",
 831         },
 832 };
 833
 834 static struct platform_device *imx_drm_pdev;
 835
 836 static int __init imx_drm_init(void)
 837 {
 838         int ret;
 839
 840         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 841         if (!imx_drm_device)
 842                 return -ENOMEM;
 843
 844         mutex_init(&imx_drm_device->mutex);
 845         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 846         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 847         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 848
 849         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 850         if (!imx_drm_pdev) {
 851                 ret = -EINVAL;
 852                 goto err_pdev;
 853         }
 854
 855         imx_drm_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32),
 856
 857         ret = platform_driver_register(&imx_drm_pdrv);
 858         if (ret)
 859                 goto err_pdrv;
 860
 861         return 0;
 862
 863 err_pdrv:
 864         platform_device_unregister(imx_drm_pdev);
 865 err_pdev:
 866         kfree(imx_drm_device);
 867
 868         return ret;
 869 }
 870
 871 static void __exit imx_drm_exit(void)
 872 {
 873         platform_device_unregister(imx_drm_pdev);
 874         platform_driver_unregister(&imx_drm_pdrv);
 875
 876         kfree(imx_drm_device);
 877 }
 878
 879 module_init(imx_drm_init);
 880 module_exit(imx_drm_exit);
 881
 882 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 883 MODULE_DESCRIPTION("i.MX drm driver core");
 884 MODULE_LICENSE("GPL");