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