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 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
  72 {
  73         return crtc->pipe;
  74 }
  75 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
  76
  77 static void imx_drm_driver_lastclose(struct drm_device *drm)
  78 {
  79         struct imx_drm_device *imxdrm = drm->dev_private;
  80
  81         if (imxdrm->fbhelper)
  82                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  83 }
  84
  85 static int imx_drm_driver_unload(struct drm_device *drm)
  86 {
  87         struct imx_drm_device *imxdrm = drm->dev_private;
  88
  89         imx_drm_device_put();
  90
  91         drm_vblank_cleanup(imxdrm->drm);
  92         drm_kms_helper_poll_fini(imxdrm->drm);
  93         drm_mode_config_cleanup(imxdrm->drm);
  94
  95         return 0;
  96 }
  97
  98 /*
  99  * We don't care at all for crtc numbers, but the core expects the
 100  * crtcs to be numbered
 101  */
 102 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
 103                 int num)
 104 {
 105         struct imx_drm_crtc *imx_drm_crtc;
 106
 107         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
 108                 if (imx_drm_crtc->pipe == num)
 109                         return imx_drm_crtc;
 110         return NULL;
 111 }
 112
 113 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
 114                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 115 {
 116         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 117         struct imx_drm_crtc *imx_crtc;
 118         struct imx_drm_crtc_helper_funcs *helper;
 119
 120         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
 121                 if (imx_crtc->crtc == crtc)
 122                         goto found;
 123
 124         return -EINVAL;
 125 found:
 126         helper = &imx_crtc->imx_drm_helper_funcs;
 127         if (helper->set_interface_pix_fmt)
 128                 return helper->set_interface_pix_fmt(crtc,
 129                                 encoder_type, interface_pix_fmt,
 130                                 hsync_pin, vsync_pin);
 131         return 0;
 132 }
 133 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
 134
 135 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
 136                 u32 interface_pix_fmt)
 137 {
 138         return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
 139                                               interface_pix_fmt, 2, 3);
 140 }
 141 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
 142
 143 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 144 {
 145         return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 146 }
 147 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 148
 149 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 150 {
 151         drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 152 }
 153 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 154
 155 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 156 {
 157         drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 158 }
 159 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 160
 161 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 162 {
 163         struct imx_drm_device *imxdrm = drm->dev_private;
 164         struct imx_drm_crtc *imx_drm_crtc;
 165         int ret;
 166
 167         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 168         if (!imx_drm_crtc)
 169                 return -EINVAL;
 170
 171         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 172                 return -ENOSYS;
 173
 174         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 175                         imx_drm_crtc->crtc);
 176
 177         return ret;
 178 }
 179
 180 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 181 {
 182         struct imx_drm_device *imxdrm = drm->dev_private;
 183         struct imx_drm_crtc *imx_drm_crtc;
 184
 185         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 186         if (!imx_drm_crtc)
 187                 return;
 188
 189         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 190                 return;
 191
 192         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 193 }
 194
 195 static void imx_drm_driver_preclose(struct drm_device *drm,
 196                 struct drm_file *file)
 197 {
 198         int i;
 199
 200         if (!file->is_master)
 201                 return;
 202
 203         for (i = 0; i < MAX_CRTC; i++)
 204                 imx_drm_disable_vblank(drm, i);
 205 }
 206
 207 static const struct file_operations imx_drm_driver_fops = {
 208         .owner = THIS_MODULE,
 209         .open = drm_open,
 210         .release = drm_release,
 211         .unlocked_ioctl = drm_ioctl,
 212         .mmap = drm_gem_cma_mmap,
 213         .poll = drm_poll,
 214         .read = drm_read,
 215         .llseek = noop_llseek,
 216 };
 217
 218 static struct imx_drm_device *imx_drm_device;
 219
 220 static struct imx_drm_device *__imx_drm_device(void)
 221 {
 222         return imx_drm_device;
 223 }
 224
 225 struct drm_device *imx_drm_device_get(void)
 226 {
 227         struct imx_drm_device *imxdrm = __imx_drm_device();
 228         struct imx_drm_encoder *enc;
 229         struct imx_drm_connector *con;
 230         struct imx_drm_crtc *crtc;
 231
 232         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 233                 if (!try_module_get(enc->owner)) {
 234                         dev_err(imxdrm->dev, "could not get module %s\n",
 235                                         module_name(enc->owner));
 236                         goto unwind_enc;
 237                 }
 238         }
 239
 240         list_for_each_entry(con, &imxdrm->connector_list, list) {
 241                 if (!try_module_get(con->owner)) {
 242                         dev_err(imxdrm->dev, "could not get module %s\n",
 243                                         module_name(con->owner));
 244                         goto unwind_con;
 245                 }
 246         }
 247
 248         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 249                 if (!try_module_get(crtc->owner)) {
 250                         dev_err(imxdrm->dev, "could not get module %s\n",
 251                                         module_name(crtc->owner));
 252                         goto unwind_crtc;
 253                 }
 254         }
 255
 256         return imxdrm->drm;
 257
 258 unwind_crtc:
 259         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 260                 module_put(crtc->owner);
 261 unwind_con:
 262         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 263                 module_put(con->owner);
 264 unwind_enc:
 265         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 266                 module_put(enc->owner);
 267
 268         mutex_unlock(&imxdrm->mutex);
 269
 270         return NULL;
 271
 272 }
 273 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 274
 275 void imx_drm_device_put(void)
 276 {
 277         struct imx_drm_device *imxdrm = __imx_drm_device();
 278         struct imx_drm_encoder *enc;
 279         struct imx_drm_connector *con;
 280         struct imx_drm_crtc *crtc;
 281
 282         mutex_lock(&imxdrm->mutex);
 283
 284         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 285                 module_put(crtc->owner);
 286
 287         list_for_each_entry(con, &imxdrm->connector_list, list)
 288                 module_put(con->owner);
 289
 290         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 291                 module_put(enc->owner);
 292
 293         mutex_unlock(&imxdrm->mutex);
 294 }
 295 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 296
 297 static int drm_mode_group_reinit(struct drm_device *dev)
 298 {
 299         struct drm_mode_group *group = &dev->primary->mode_group;
 300         uint32_t *id_list = group->id_list;
 301         int ret;
 302
 303         ret = drm_mode_group_init_legacy_group(dev, group);
 304         if (ret < 0)
 305                 return ret;
 306
 307         kfree(id_list);
 308         return 0;
 309 }
 310
 311 /*
 312  * register an encoder to the drm core
 313  */
 314 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 315 {
 316         struct imx_drm_device *imxdrm = __imx_drm_device();
 317
 318         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 319
 320         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 321                         imx_drm_encoder->encoder->funcs,
 322                         imx_drm_encoder->encoder->encoder_type);
 323
 324         drm_mode_group_reinit(imxdrm->drm);
 325
 326         return 0;
 327 }
 328
 329 /*
 330  * unregister an encoder from the drm core
 331  */
 332 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 333                 *imx_drm_encoder)
 334 {
 335         struct imx_drm_device *imxdrm = __imx_drm_device();
 336
 337         drm_encoder_cleanup(imx_drm_encoder->encoder);
 338
 339         drm_mode_group_reinit(imxdrm->drm);
 340 }
 341
 342 /*
 343  * register a connector to the drm core
 344  */
 345 static int imx_drm_connector_register(
 346                 struct imx_drm_connector *imx_drm_connector)
 347 {
 348         struct imx_drm_device *imxdrm = __imx_drm_device();
 349
 350         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 351                         imx_drm_connector->connector->funcs,
 352                         imx_drm_connector->connector->connector_type);
 353         drm_mode_group_reinit(imxdrm->drm);
 354
 355         return drm_sysfs_connector_add(imx_drm_connector->connector);
 356 }
 357
 358 /*
 359  * unregister a connector from the drm core
 360  */
 361 static void imx_drm_connector_unregister(
 362                 struct imx_drm_connector *imx_drm_connector)
 363 {
 364         struct imx_drm_device *imxdrm = __imx_drm_device();
 365
 366         drm_sysfs_connector_remove(imx_drm_connector->connector);
 367         drm_connector_cleanup(imx_drm_connector->connector);
 368
 369         drm_mode_group_reinit(imxdrm->drm);
 370 }
 371
 372 /*
 373  * register a crtc to the drm core
 374  */
 375 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 376 {
 377         struct imx_drm_device *imxdrm = __imx_drm_device();
 378         int ret;
 379
 380         drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 381                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 382         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 383         if (ret)
 384                 return ret;
 385
 386         drm_crtc_helper_add(imx_drm_crtc->crtc,
 387                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 388
 389         drm_mode_group_reinit(imxdrm->drm);
 390
 391         return 0;
 392 }
 393
 394 /*
 395  * Called by the CRTC driver when all CRTCs are registered. This
 396  * puts all the pieces together and initializes the driver.
 397  * Once this is called no more CRTCs can be registered since
 398  * the drm core has hardcoded the number of crtcs in several
 399  * places.
 400  */
 401 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 402 {
 403         struct imx_drm_device *imxdrm = __imx_drm_device();
 404         int ret;
 405
 406         imxdrm->drm = drm;
 407
 408         drm->dev_private = imxdrm;
 409
 410         /*
 411          * enable drm irq mode.
 412          * - with irq_enabled = true, we can use the vblank feature.
 413          *
 414          * P.S. note that we wouldn't use drm irq handler but
 415          *      just specific driver own one instead because
 416          *      drm framework supports only one irq handler and
 417          *      drivers can well take care of their interrupts
 418          */
 419         drm->irq_enabled = true;
 420
 421         drm_mode_config_init(drm);
 422         imx_drm_mode_config_init(drm);
 423
 424         mutex_lock(&imxdrm->mutex);
 425
 426         drm_kms_helper_poll_init(imxdrm->drm);
 427
 428         /* setup the grouping for the legacy output */
 429         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 430                         &imxdrm->drm->primary->mode_group);
 431         if (ret)
 432                 goto err_kms;
 433
 434         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 435         if (ret)
 436                 goto err_kms;
 437
 438         /*
 439          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 440          * by drm timer once a current process gives up ownership of
 441          * vblank event.(after drm_vblank_put function is called)
 442          */
 443         imxdrm->drm->vblank_disable_allowed = true;
 444
 445         if (!imx_drm_device_get()) {
 446                 ret = -EINVAL;
 447                 goto err_vblank;
 448         }
 449
 450         mutex_unlock(&imxdrm->mutex);
 451         return 0;
 452
 453 err_vblank:
 454         drm_vblank_cleanup(drm);
 455 err_kms:
 456         drm_kms_helper_poll_fini(drm);
 457         drm_mode_config_cleanup(drm);
 458         mutex_unlock(&imxdrm->mutex);
 459
 460         return ret;
 461 }
 462
 463 static void imx_drm_update_possible_crtcs(void)
 464 {
 465         struct imx_drm_device *imxdrm = __imx_drm_device();
 466         struct imx_drm_crtc *imx_drm_crtc;
 467         struct imx_drm_encoder *enc;
 468         struct crtc_cookie *cookie;
 469
 470         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 471                 u32 possible_crtcs = 0;
 472
 473                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 474                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 475                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 476                                                 imx_drm_crtc->cookie.id == cookie->id) {
 477                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 478                                 }
 479                         }
 480                 }
 481                 enc->encoder->possible_crtcs = possible_crtcs;
 482                 enc->encoder->possible_clones = possible_crtcs;
 483         }
 484 }
 485
 486 /*
 487  * imx_drm_add_crtc - add a new crtc
 488  *
 489  * The return value if !NULL is a cookie for the caller to pass to
 490  * imx_drm_remove_crtc later.
 491  */
 492 int imx_drm_add_crtc(struct drm_crtc *crtc,
 493                 struct imx_drm_crtc **new_crtc,
 494                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 495                 struct module *owner, void *cookie, int id)
 496 {
 497         struct imx_drm_device *imxdrm = __imx_drm_device();
 498         struct imx_drm_crtc *imx_drm_crtc;
 499         int ret;
 500
 501         mutex_lock(&imxdrm->mutex);
 502
 503         if (imxdrm->drm->open_count) {
 504                 ret = -EBUSY;
 505                 goto err_busy;
 506         }
 507
 508         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 509         if (!imx_drm_crtc) {
 510                 ret = -ENOMEM;
 511                 goto err_alloc;
 512         }
 513
 514         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 515         imx_drm_crtc->pipe = imxdrm->pipes++;
 516         imx_drm_crtc->cookie.cookie = cookie;
 517         imx_drm_crtc->cookie.id = id;
 518
 519         imx_drm_crtc->crtc = crtc;
 520         imx_drm_crtc->imxdrm = imxdrm;
 521
 522         imx_drm_crtc->owner = owner;
 523
 524         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 525
 526         *new_crtc = imx_drm_crtc;
 527
 528         ret = imx_drm_crtc_register(imx_drm_crtc);
 529         if (ret)
 530                 goto err_register;
 531
 532         imx_drm_update_possible_crtcs();
 533
 534         mutex_unlock(&imxdrm->mutex);
 535
 536         return 0;
 537
 538 err_register:
 539         list_del(&imx_drm_crtc->list);
 540         kfree(imx_drm_crtc);
 541 err_alloc:
 542 err_busy:
 543         mutex_unlock(&imxdrm->mutex);
 544         return ret;
 545 }
 546 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 547
 548 /*
 549  * imx_drm_remove_crtc - remove a crtc
 550  */
 551 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 552 {
 553         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 554
 555         mutex_lock(&imxdrm->mutex);
 556
 557         drm_crtc_cleanup(imx_drm_crtc->crtc);
 558
 559         list_del(&imx_drm_crtc->list);
 560
 561         drm_mode_group_reinit(imxdrm->drm);
 562
 563         mutex_unlock(&imxdrm->mutex);
 564
 565         kfree(imx_drm_crtc);
 566
 567         return 0;
 568 }
 569 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 570
 571 /*
 572  * imx_drm_add_encoder - add a new encoder
 573  */
 574 int imx_drm_add_encoder(struct drm_encoder *encoder,
 575                 struct imx_drm_encoder **newenc, struct module *owner)
 576 {
 577         struct imx_drm_device *imxdrm = __imx_drm_device();
 578         struct imx_drm_encoder *imx_drm_encoder;
 579         int ret;
 580
 581         mutex_lock(&imxdrm->mutex);
 582
 583         if (imxdrm->drm->open_count) {
 584                 ret = -EBUSY;
 585                 goto err_busy;
 586         }
 587
 588         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 589         if (!imx_drm_encoder) {
 590                 ret = -ENOMEM;
 591                 goto err_alloc;
 592         }
 593
 594         imx_drm_encoder->encoder = encoder;
 595         imx_drm_encoder->owner = owner;
 596
 597         ret = imx_drm_encoder_register(imx_drm_encoder);
 598         if (ret) {
 599                 ret = -ENOMEM;
 600                 goto err_register;
 601         }
 602
 603         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 604
 605         *newenc = imx_drm_encoder;
 606
 607         mutex_unlock(&imxdrm->mutex);
 608
 609         return 0;
 610
 611 err_register:
 612         kfree(imx_drm_encoder);
 613 err_alloc:
 614 err_busy:
 615         mutex_unlock(&imxdrm->mutex);
 616
 617         return ret;
 618 }
 619 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 620
 621 int imx_drm_encoder_add_possible_crtcs(
 622                 struct imx_drm_encoder *imx_drm_encoder,
 623                 struct device_node *np)
 624 {
 625         struct imx_drm_device *imxdrm = __imx_drm_device();
 626         struct of_phandle_args args;
 627         struct crtc_cookie *c;
 628         int ret = 0;
 629         int i;
 630
 631         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 632                 return -EBUSY;
 633
 634         for (i = 0; !ret; i++) {
 635                 ret = of_parse_phandle_with_args(np, "crtcs",
 636                                 "#crtc-cells", i, &args);
 637                 if (ret < 0)
 638                         break;
 639
 640                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 641                 if (!c) {
 642                         of_node_put(args.np);
 643                         return -ENOMEM;
 644                 }
 645
 646                 c->cookie = args.np;
 647                 c->id = args.args_count > 0 ? args.args[0] : 0;
 648
 649                 of_node_put(args.np);
 650
 651                 mutex_lock(&imxdrm->mutex);
 652
 653                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 654
 655                 mutex_unlock(&imxdrm->mutex);
 656         }
 657
 658         imx_drm_update_possible_crtcs();
 659
 660         return 0;
 661 }
 662 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 663
 664 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 665                 struct drm_crtc *crtc)
 666 {
 667         struct imx_drm_device *imxdrm = __imx_drm_device();
 668         struct imx_drm_crtc *imx_crtc;
 669         int i = 0;
 670
 671         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 672                 if (imx_crtc->crtc == crtc)
 673                         goto found;
 674                 i++;
 675         }
 676
 677         return -EINVAL;
 678 found:
 679         return i;
 680 }
 681 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 682
 683 /*
 684  * imx_drm_remove_encoder - remove an encoder
 685  */
 686 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 687 {
 688         struct imx_drm_device *imxdrm = __imx_drm_device();
 689         struct crtc_cookie *c, *tmp;
 690
 691         mutex_lock(&imxdrm->mutex);
 692
 693         imx_drm_encoder_unregister(imx_drm_encoder);
 694
 695         list_del(&imx_drm_encoder->list);
 696
 697         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 698                         list)
 699                 kfree(c);
 700
 701         mutex_unlock(&imxdrm->mutex);
 702
 703         kfree(imx_drm_encoder);
 704
 705         return 0;
 706 }
 707 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 708
 709 /*
 710  * imx_drm_add_connector - add a connector
 711  */
 712 int imx_drm_add_connector(struct drm_connector *connector,
 713                 struct imx_drm_connector **new_con,
 714                 struct module *owner)
 715 {
 716         struct imx_drm_device *imxdrm = __imx_drm_device();
 717         struct imx_drm_connector *imx_drm_connector;
 718         int ret;
 719
 720         mutex_lock(&imxdrm->mutex);
 721
 722         if (imxdrm->drm->open_count) {
 723                 ret = -EBUSY;
 724                 goto err_busy;
 725         }
 726
 727         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 728         if (!imx_drm_connector) {
 729                 ret = -ENOMEM;
 730                 goto err_alloc;
 731         }
 732
 733         imx_drm_connector->connector = connector;
 734         imx_drm_connector->owner = owner;
 735
 736         ret = imx_drm_connector_register(imx_drm_connector);
 737         if (ret)
 738                 goto err_register;
 739
 740         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 741
 742         *new_con = imx_drm_connector;
 743
 744         mutex_unlock(&imxdrm->mutex);
 745
 746         return 0;
 747
 748 err_register:
 749         kfree(imx_drm_connector);
 750 err_alloc:
 751 err_busy:
 752         mutex_unlock(&imxdrm->mutex);
 753
 754         return ret;
 755 }
 756 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 757
 758 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 759 {
 760         struct imx_drm_device *imxdrm = __imx_drm_device();
 761
 762         imxdrm->fbhelper = fbdev_helper;
 763 }
 764 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 765
 766 /*
 767  * imx_drm_remove_connector - remove a connector
 768  */
 769 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 770 {
 771         struct imx_drm_device *imxdrm = __imx_drm_device();
 772
 773         mutex_lock(&imxdrm->mutex);
 774
 775         imx_drm_connector_unregister(imx_drm_connector);
 776
 777         list_del(&imx_drm_connector->list);
 778
 779         mutex_unlock(&imxdrm->mutex);
 780
 781         kfree(imx_drm_connector);
 782
 783         return 0;
 784 }
 785 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 786
 787 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 788         /* none so far */
 789 };
 790
 791 static struct drm_driver imx_drm_driver = {
 792         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 793         .load                   = imx_drm_driver_load,
 794         .unload                 = imx_drm_driver_unload,
 795         .lastclose              = imx_drm_driver_lastclose,
 796         .preclose               = imx_drm_driver_preclose,
 797         .gem_free_object        = drm_gem_cma_free_object,
 798         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 799         .dumb_create            = drm_gem_cma_dumb_create,
 800         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 801         .dumb_destroy           = drm_gem_dumb_destroy,
 802
 803         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 804         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 805         .gem_prime_import       = drm_gem_prime_import,
 806         .gem_prime_export       = drm_gem_prime_export,
 807         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 808         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 809         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 810         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 811         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 812         .get_vblank_counter     = drm_vblank_count,
 813         .enable_vblank          = imx_drm_enable_vblank,
 814         .disable_vblank         = imx_drm_disable_vblank,
 815         .ioctls                 = imx_drm_ioctls,
 816         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 817         .fops                   = &imx_drm_driver_fops,
 818         .name                   = "imx-drm",
 819         .desc                   = "i.MX DRM graphics",
 820         .date                   = "20120507",
 821         .major                  = 1,
 822         .minor                  = 0,
 823         .patchlevel             = 0,
 824 };
 825
 826 static int imx_drm_platform_probe(struct platform_device *pdev)
 827 {
 828         int ret;
 829
 830         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 831         if (ret)
 832                 return ret;
 833
 834         imx_drm_device->dev = &pdev->dev;
 835
 836         return drm_platform_init(&imx_drm_driver, pdev);
 837 }
 838
 839 static int imx_drm_platform_remove(struct platform_device *pdev)
 840 {
 841         drm_platform_exit(&imx_drm_driver, pdev);
 842
 843         return 0;
 844 }
 845
 846 static struct platform_driver imx_drm_pdrv = {
 847         .probe          = imx_drm_platform_probe,
 848         .remove         = imx_drm_platform_remove,
 849         .driver         = {
 850                 .owner  = THIS_MODULE,
 851                 .name   = "imx-drm",
 852         },
 853 };
 854
 855 static struct platform_device *imx_drm_pdev;
 856
 857 static int __init imx_drm_init(void)
 858 {
 859         int ret;
 860
 861         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 862         if (!imx_drm_device)
 863                 return -ENOMEM;
 864
 865         mutex_init(&imx_drm_device->mutex);
 866         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 867         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 868         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 869
 870         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 871         if (IS_ERR(imx_drm_pdev)) {
 872                 ret = PTR_ERR(imx_drm_pdev);
 873                 goto err_pdev;
 874         }
 875
 876         ret = platform_driver_register(&imx_drm_pdrv);
 877         if (ret)
 878                 goto err_pdrv;
 879
 880         return 0;
 881
 882 err_pdrv:
 883         platform_device_unregister(imx_drm_pdev);
 884 err_pdev:
 885         kfree(imx_drm_device);
 886
 887         return ret;
 888 }
 889
 890 static void __exit imx_drm_exit(void)
 891 {
 892         platform_device_unregister(imx_drm_pdev);
 893         platform_driver_unregister(&imx_drm_pdrv);
 894
 895         kfree(imx_drm_device);
 896 }
 897
 898 module_init(imx_drm_init);
 899 module_exit(imx_drm_exit);
 900
 901 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 902 MODULE_DESCRIPTION("i.MX drm driver core");
 903 MODULE_LICENSE("GPL");