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