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
 141 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 142 {
 143         return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 144 }
 145 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 146
 147 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 148 {
 149         drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 150 }
 151 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 152
 153 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 154 {
 155         drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 156 }
 157 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 158
 159 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 160 {
 161         struct imx_drm_device *imxdrm = drm->dev_private;
 162         struct imx_drm_crtc *imx_drm_crtc;
 163         int ret;
 164
 165         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 166         if (!imx_drm_crtc)
 167                 return -EINVAL;
 168
 169         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 170                 return -ENOSYS;
 171
 172         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 173                         imx_drm_crtc->crtc);
 174
 175         return ret;
 176 }
 177
 178 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 179 {
 180         struct imx_drm_device *imxdrm = drm->dev_private;
 181         struct imx_drm_crtc *imx_drm_crtc;
 182
 183         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 184         if (!imx_drm_crtc)
 185                 return;
 186
 187         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 188                 return;
 189
 190         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 191 }
 192
 193 static const struct file_operations imx_drm_driver_fops = {
 194         .owner = THIS_MODULE,
 195         .open = drm_open,
 196         .release = drm_release,
 197         .unlocked_ioctl = drm_ioctl,
 198         .mmap = drm_gem_cma_mmap,
 199         .poll = drm_poll,
 200         .fasync = drm_fasync,
 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         mutex_lock(&imxdrm->mutex);
 220
 221         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 222                 if (!try_module_get(enc->owner)) {
 223                         dev_err(imxdrm->dev, "could not get module %s\n",
 224                                         module_name(enc->owner));
 225                         goto unwind_enc;
 226                 }
 227         }
 228
 229         list_for_each_entry(con, &imxdrm->connector_list, list) {
 230                 if (!try_module_get(con->owner)) {
 231                         dev_err(imxdrm->dev, "could not get module %s\n",
 232                                         module_name(con->owner));
 233                         goto unwind_con;
 234                 }
 235         }
 236
 237         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 238                 if (!try_module_get(crtc->owner)) {
 239                         dev_err(imxdrm->dev, "could not get module %s\n",
 240                                         module_name(crtc->owner));
 241                         goto unwind_crtc;
 242                 }
 243         }
 244
 245         imxdrm->references++;
 246
 247         mutex_unlock(&imxdrm->mutex);
 248
 249         return imxdrm->drm;
 250
 251 unwind_crtc:
 252         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 253                 module_put(crtc->owner);
 254 unwind_con:
 255         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 256                 module_put(con->owner);
 257 unwind_enc:
 258         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 259                 module_put(enc->owner);
 260
 261         mutex_unlock(&imxdrm->mutex);
 262
 263         return NULL;
 264
 265 }
 266 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 267
 268 void imx_drm_device_put(void)
 269 {
 270         struct imx_drm_device *imxdrm = __imx_drm_device();
 271         struct imx_drm_encoder *enc;
 272         struct imx_drm_connector *con;
 273         struct imx_drm_crtc *crtc;
 274
 275         mutex_lock(&imxdrm->mutex);
 276
 277         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 278                 module_put(crtc->owner);
 279
 280         list_for_each_entry(con, &imxdrm->connector_list, list)
 281                 module_put(con->owner);
 282
 283         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 284                 module_put(enc->owner);
 285
 286         imxdrm->references--;
 287
 288         mutex_unlock(&imxdrm->mutex);
 289 }
 290 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 291
 292 static int drm_mode_group_reinit(struct drm_device *dev)
 293 {
 294         struct drm_mode_group *group = &dev->primary->mode_group;
 295         uint32_t *id_list = group->id_list;
 296         int ret;
 297
 298         ret = drm_mode_group_init_legacy_group(dev, group);
 299         if (ret < 0)
 300                 return ret;
 301
 302         kfree(id_list);
 303         return 0;
 304 }
 305
 306 /*
 307  * register an encoder to the drm core
 308  */
 309 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 310 {
 311         struct imx_drm_device *imxdrm = __imx_drm_device();
 312
 313         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 314
 315         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 316                         imx_drm_encoder->encoder->funcs,
 317                         imx_drm_encoder->encoder->encoder_type);
 318
 319         drm_mode_group_reinit(imxdrm->drm);
 320
 321         return 0;
 322 }
 323
 324 /*
 325  * unregister an encoder from the drm core
 326  */
 327 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 328                 *imx_drm_encoder)
 329 {
 330         struct imx_drm_device *imxdrm = __imx_drm_device();
 331
 332         drm_encoder_cleanup(imx_drm_encoder->encoder);
 333
 334         drm_mode_group_reinit(imxdrm->drm);
 335 }
 336
 337 /*
 338  * register a connector to the drm core
 339  */
 340 static int imx_drm_connector_register(
 341                 struct imx_drm_connector *imx_drm_connector)
 342 {
 343         struct imx_drm_device *imxdrm = __imx_drm_device();
 344
 345         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 346                         imx_drm_connector->connector->funcs,
 347                         imx_drm_connector->connector->connector_type);
 348         drm_mode_group_reinit(imxdrm->drm);
 349
 350         return drm_sysfs_connector_add(imx_drm_connector->connector);
 351 }
 352
 353 /*
 354  * unregister a connector from the drm core
 355  */
 356 static void imx_drm_connector_unregister(
 357                 struct imx_drm_connector *imx_drm_connector)
 358 {
 359         struct imx_drm_device *imxdrm = __imx_drm_device();
 360
 361         drm_sysfs_connector_remove(imx_drm_connector->connector);
 362         drm_connector_cleanup(imx_drm_connector->connector);
 363
 364         drm_mode_group_reinit(imxdrm->drm);
 365 }
 366
 367 /*
 368  * register a crtc to the drm core
 369  */
 370 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 371 {
 372         struct imx_drm_device *imxdrm = __imx_drm_device();
 373         int ret;
 374
 375         drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 376                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 377         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 378         if (ret)
 379                 return ret;
 380
 381         drm_crtc_helper_add(imx_drm_crtc->crtc,
 382                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 383
 384         drm_mode_group_reinit(imxdrm->drm);
 385
 386         return 0;
 387 }
 388
 389 /*
 390  * Called by the CRTC driver when all CRTCs are registered. This
 391  * puts all the pieces together and initializes the driver.
 392  * Once this is called no more CRTCs can be registered since
 393  * the drm core has hardcoded the number of crtcs in several
 394  * places.
 395  */
 396 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 397 {
 398         struct imx_drm_device *imxdrm = __imx_drm_device();
 399         int ret;
 400
 401         imxdrm->drm = drm;
 402
 403         drm->dev_private = imxdrm;
 404
 405         /*
 406          * enable drm irq mode.
 407          * - with irq_enabled = 1, we can use the vblank feature.
 408          *
 409          * P.S. note that we wouldn't use drm irq handler but
 410          *      just specific driver own one instead because
 411          *      drm framework supports only one irq handler and
 412          *      drivers can well take care of their interrupts
 413          */
 414         drm->irq_enabled = 1;
 415
 416         drm_mode_config_init(drm);
 417         imx_drm_mode_config_init(drm);
 418
 419         mutex_lock(&imxdrm->mutex);
 420
 421         drm_kms_helper_poll_init(imxdrm->drm);
 422
 423         /* setup the grouping for the legacy output */
 424         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 425                         &imxdrm->drm->primary->mode_group);
 426         if (ret)
 427                 goto err_init;
 428
 429         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 430         if (ret)
 431                 goto err_init;
 432
 433         /*
 434          * with vblank_disable_allowed = 1, vblank interrupt will be disabled
 435          * by drm timer once a current process gives up ownership of
 436          * vblank event.(after drm_vblank_put function is called)
 437          */
 438         imxdrm->drm->vblank_disable_allowed = 1;
 439
 440         ret = 0;
 441
 442 err_init:
 443         mutex_unlock(&imxdrm->mutex);
 444
 445         return ret;
 446 }
 447
 448 static void imx_drm_update_possible_crtcs(void)
 449 {
 450         struct imx_drm_device *imxdrm = __imx_drm_device();
 451         struct imx_drm_crtc *imx_drm_crtc;
 452         struct imx_drm_encoder *enc;
 453         struct crtc_cookie *cookie;
 454
 455         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 456                 u32 possible_crtcs = 0;
 457
 458                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 459                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 460                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 461                                                 imx_drm_crtc->cookie.id == cookie->id) {
 462                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 463                                 }
 464                         }
 465                 }
 466                 enc->encoder->possible_crtcs = possible_crtcs;
 467                 enc->encoder->possible_clones = possible_crtcs;
 468         }
 469 }
 470
 471 /*
 472  * imx_drm_add_crtc - add a new crtc
 473  *
 474  * The return value if !NULL is a cookie for the caller to pass to
 475  * imx_drm_remove_crtc later.
 476  */
 477 int imx_drm_add_crtc(struct drm_crtc *crtc,
 478                 struct imx_drm_crtc **new_crtc,
 479                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 480                 struct module *owner, void *cookie, int id)
 481 {
 482         struct imx_drm_device *imxdrm = __imx_drm_device();
 483         struct imx_drm_crtc *imx_drm_crtc;
 484         const struct drm_crtc_funcs *crtc_funcs;
 485         int ret;
 486
 487         mutex_lock(&imxdrm->mutex);
 488
 489         if (imxdrm->references) {
 490                 ret = -EBUSY;
 491                 goto err_busy;
 492         }
 493
 494         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 495         if (!imx_drm_crtc) {
 496                 ret = -ENOMEM;
 497                 goto err_alloc;
 498         }
 499
 500         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 501         imx_drm_crtc->pipe = imxdrm->pipes++;
 502         imx_drm_crtc->cookie.cookie = cookie;
 503         imx_drm_crtc->cookie.id = id;
 504
 505         crtc_funcs = imx_drm_helper_funcs->crtc_funcs;
 506
 507         imx_drm_crtc->crtc = crtc;
 508         imx_drm_crtc->imxdrm = imxdrm;
 509
 510         imx_drm_crtc->owner = owner;
 511
 512         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 513
 514         *new_crtc = imx_drm_crtc;
 515
 516         ret = imx_drm_crtc_register(imx_drm_crtc);
 517         if (ret)
 518                 goto err_register;
 519
 520         imx_drm_update_possible_crtcs();
 521
 522         mutex_unlock(&imxdrm->mutex);
 523
 524         return 0;
 525
 526 err_register:
 527         kfree(imx_drm_crtc);
 528 err_alloc:
 529 err_busy:
 530         mutex_unlock(&imxdrm->mutex);
 531         return ret;
 532 }
 533 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 534
 535 /*
 536  * imx_drm_remove_crtc - remove a crtc
 537  */
 538 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 539 {
 540         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 541
 542         mutex_lock(&imxdrm->mutex);
 543
 544         drm_crtc_cleanup(imx_drm_crtc->crtc);
 545
 546         list_del(&imx_drm_crtc->list);
 547
 548         drm_mode_group_reinit(imxdrm->drm);
 549
 550         mutex_unlock(&imxdrm->mutex);
 551
 552         kfree(imx_drm_crtc);
 553
 554         return 0;
 555 }
 556 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 557
 558 /*
 559  * imx_drm_add_encoder - add a new encoder
 560  */
 561 int imx_drm_add_encoder(struct drm_encoder *encoder,
 562                 struct imx_drm_encoder **newenc, struct module *owner)
 563 {
 564         struct imx_drm_device *imxdrm = __imx_drm_device();
 565         struct imx_drm_encoder *imx_drm_encoder;
 566         int ret;
 567
 568         mutex_lock(&imxdrm->mutex);
 569
 570         if (imxdrm->references) {
 571                 ret = -EBUSY;
 572                 goto err_busy;
 573         }
 574
 575         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 576         if (!imx_drm_encoder) {
 577                 ret = -ENOMEM;
 578                 goto err_alloc;
 579         }
 580
 581         imx_drm_encoder->encoder = encoder;
 582         imx_drm_encoder->owner = owner;
 583
 584         ret = imx_drm_encoder_register(imx_drm_encoder);
 585         if (ret) {
 586                 kfree(imx_drm_encoder);
 587                 ret = -ENOMEM;
 588                 goto err_register;
 589         }
 590
 591         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 592
 593         *newenc = imx_drm_encoder;
 594
 595         mutex_unlock(&imxdrm->mutex);
 596
 597         return 0;
 598
 599 err_register:
 600         kfree(imx_drm_encoder);
 601 err_alloc:
 602 err_busy:
 603         mutex_unlock(&imxdrm->mutex);
 604
 605         return ret;
 606 }
 607 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 608
 609 int imx_drm_encoder_add_possible_crtcs(
 610                 struct imx_drm_encoder *imx_drm_encoder,
 611                 struct device_node *np)
 612 {
 613         struct imx_drm_device *imxdrm = __imx_drm_device();
 614         struct of_phandle_args args;
 615         struct crtc_cookie *c;
 616         int ret = 0;
 617         int i;
 618
 619         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 620                 return -EBUSY;
 621
 622         for (i = 0; !ret; i++) {
 623                 ret = of_parse_phandle_with_args(np, "crtcs",
 624                                 "#crtc-cells", i, &args);
 625                 if (ret < 0)
 626                         break;
 627
 628                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 629                 if (!c) {
 630                         of_node_put(args.np);
 631                         return -ENOMEM;
 632                 }
 633
 634                 c->cookie = args.np;
 635                 c->id = args.args_count > 0 ? args.args[0] : 0;
 636
 637                 of_node_put(args.np);
 638
 639                 mutex_lock(&imxdrm->mutex);
 640
 641                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 642
 643                 mutex_unlock(&imxdrm->mutex);
 644         }
 645
 646         imx_drm_update_possible_crtcs();
 647
 648         return 0;
 649 }
 650
 651 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 652                 struct drm_crtc *crtc)
 653 {
 654         struct imx_drm_device *imxdrm = __imx_drm_device();
 655         struct imx_drm_crtc *imx_crtc;
 656         int i = 0;
 657
 658         mutex_lock(&imxdrm->mutex);
 659
 660         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 661                 if (imx_crtc->crtc == crtc)
 662                         goto found;
 663                 i++;
 664         }
 665
 666         mutex_unlock(&imxdrm->mutex);
 667
 668         return -EINVAL;
 669 found:
 670         mutex_unlock(&imxdrm->mutex);
 671
 672         return i;
 673 }
 674
 675 /*
 676  * imx_drm_remove_encoder - remove an encoder
 677  */
 678 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 679 {
 680         struct imx_drm_device *imxdrm = __imx_drm_device();
 681         struct crtc_cookie *c, *tmp;
 682
 683         mutex_lock(&imxdrm->mutex);
 684
 685         imx_drm_encoder_unregister(imx_drm_encoder);
 686
 687         list_del(&imx_drm_encoder->list);
 688
 689         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 690                         list)
 691                 kfree(c);
 692
 693         mutex_unlock(&imxdrm->mutex);
 694
 695         kfree(imx_drm_encoder);
 696
 697         return 0;
 698 }
 699 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 700
 701 /*
 702  * imx_drm_add_connector - add a connector
 703  */
 704 int imx_drm_add_connector(struct drm_connector *connector,
 705                 struct imx_drm_connector **new_con,
 706                 struct module *owner)
 707 {
 708         struct imx_drm_device *imxdrm = __imx_drm_device();
 709         struct imx_drm_connector *imx_drm_connector;
 710         int ret;
 711
 712         mutex_lock(&imxdrm->mutex);
 713
 714         if (imxdrm->references) {
 715                 ret = -EBUSY;
 716                 goto err_busy;
 717         }
 718
 719         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 720         if (!imx_drm_connector) {
 721                 ret = -ENOMEM;
 722                 goto err_alloc;
 723         }
 724
 725         imx_drm_connector->connector = connector;
 726         imx_drm_connector->owner = owner;
 727
 728         ret = imx_drm_connector_register(imx_drm_connector);
 729         if (ret)
 730                 goto err_register;
 731
 732         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 733
 734         *new_con = imx_drm_connector;
 735
 736         mutex_unlock(&imxdrm->mutex);
 737
 738         return 0;
 739
 740 err_register:
 741         kfree(imx_drm_connector);
 742 err_alloc:
 743 err_busy:
 744         mutex_unlock(&imxdrm->mutex);
 745
 746         return ret;
 747 }
 748 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 749
 750 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 751 {
 752         struct imx_drm_device *imxdrm = __imx_drm_device();
 753
 754         imxdrm->fbhelper = fbdev_helper;
 755 }
 756 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 757
 758 /*
 759  * imx_drm_remove_connector - remove a connector
 760  */
 761 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 762 {
 763         struct imx_drm_device *imxdrm = __imx_drm_device();
 764
 765         mutex_lock(&imxdrm->mutex);
 766
 767         imx_drm_connector_unregister(imx_drm_connector);
 768
 769         list_del(&imx_drm_connector->list);
 770
 771         mutex_unlock(&imxdrm->mutex);
 772
 773         kfree(imx_drm_connector);
 774
 775         return 0;
 776 }
 777 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 778
 779 static struct drm_ioctl_desc imx_drm_ioctls[] = {
 780         /* none so far */
 781 };
 782
 783 static struct drm_driver imx_drm_driver = {
 784         .driver_features        = DRIVER_MODESET | DRIVER_GEM,
 785         .load                   = imx_drm_driver_load,
 786         .unload                 = imx_drm_driver_unload,
 787         .firstopen              = imx_drm_driver_firstopen,
 788         .lastclose              = imx_drm_driver_lastclose,
 789         .gem_free_object        = drm_gem_cma_free_object,
 790         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 791         .dumb_create            = drm_gem_cma_dumb_create,
 792         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 793         .dumb_destroy           = drm_gem_cma_dumb_destroy,
 794
 795         .get_vblank_counter     = drm_vblank_count,
 796         .enable_vblank          = imx_drm_enable_vblank,
 797         .disable_vblank         = imx_drm_disable_vblank,
 798         .ioctls                 = imx_drm_ioctls,
 799         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 800         .fops                   = &imx_drm_driver_fops,
 801         .name                   = "imx-drm",
 802         .desc                   = "i.MX DRM graphics",
 803         .date                   = "20120507",
 804         .major                  = 1,
 805         .minor                  = 0,
 806         .patchlevel             = 0,
 807 };
 808
 809 static int imx_drm_platform_probe(struct platform_device *pdev)
 810 {
 811         imx_drm_device->dev = &pdev->dev;
 812
 813         return drm_platform_init(&imx_drm_driver, pdev);
 814 }
 815
 816 static int imx_drm_platform_remove(struct platform_device *pdev)
 817 {
 818         drm_platform_exit(&imx_drm_driver, pdev);
 819
 820         return 0;
 821 }
 822
 823 static struct platform_driver imx_drm_pdrv = {
 824         .probe          = imx_drm_platform_probe,
 825         .remove         = __devexit_p(imx_drm_platform_remove),
 826         .driver         = {
 827                 .owner  = THIS_MODULE,
 828                 .name   = "imx-drm",
 829         },
 830 };
 831
 832 static struct platform_device *imx_drm_pdev;
 833
 834 static int __init imx_drm_init(void)
 835 {
 836         int ret;
 837
 838         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 839         if (!imx_drm_device)
 840                 return -ENOMEM;
 841
 842         mutex_init(&imx_drm_device->mutex);
 843         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 844         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 845         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 846
 847         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 848         if (!imx_drm_pdev) {
 849                 ret = -EINVAL;
 850                 goto err_pdev;
 851         }
 852
 853         imx_drm_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32),
 854
 855         ret = platform_driver_register(&imx_drm_pdrv);
 856         if (ret)
 857                 goto err_pdrv;
 858
 859         return 0;
 860
 861 err_pdrv:
 862         platform_device_unregister(imx_drm_pdev);
 863 err_pdev:
 864         kfree(imx_drm_device);
 865
 866         return ret;
 867 }
 868
 869 static void __exit imx_drm_exit(void)
 870 {
 871         platform_device_unregister(imx_drm_pdev);
 872         platform_driver_unregister(&imx_drm_pdrv);
 873
 874         kfree(imx_drm_device);
 875 }
 876
 877 module_init(imx_drm_init);
 878 module_exit(imx_drm_exit);
 879
 880 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 881 MODULE_DESCRIPTION("i.MX drm driver core");
 882 MODULE_LICENSE("GPL");