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_mode_config_cleanup(imxdrm->drm);
  92         drm_kms_helper_poll_fini(imxdrm->drm);
  93
  94         return 0;
  95 }
  96
  97 /*
  98  * We don't care at all for crtc numbers, but the core expects the
  99  * crtcs to be numbered
 100  */
 101 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
 102                 int num)
 103 {
 104         struct imx_drm_crtc *imx_drm_crtc;
 105
 106         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
 107                 if (imx_drm_crtc->pipe == num)
 108                         return imx_drm_crtc;
 109         return NULL;
 110 }
 111
 112 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
 113                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 114 {
 115         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 116         struct imx_drm_crtc *imx_crtc;
 117         struct imx_drm_crtc_helper_funcs *helper;
 118
 119         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
 120                 if (imx_crtc->crtc == crtc)
 121                         goto found;
 122
 123         return -EINVAL;
 124 found:
 125         helper = &imx_crtc->imx_drm_helper_funcs;
 126         if (helper->set_interface_pix_fmt)
 127                 return helper->set_interface_pix_fmt(crtc,
 128                                 encoder_type, interface_pix_fmt,
 129                                 hsync_pin, vsync_pin);
 130         return 0;
 131 }
 132 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
 133
 134 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
 135                 u32 interface_pix_fmt)
 136 {
 137         return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
 138                                               interface_pix_fmt, 2, 3);
 139 }
 140 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
 141
 142 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 143 {
 144         return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 145 }
 146 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 147
 148 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 149 {
 150         drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 151 }
 152 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 153
 154 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 155 {
 156         drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 157 }
 158 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 159
 160 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 161 {
 162         struct imx_drm_device *imxdrm = drm->dev_private;
 163         struct imx_drm_crtc *imx_drm_crtc;
 164         int ret;
 165
 166         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 167         if (!imx_drm_crtc)
 168                 return -EINVAL;
 169
 170         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 171                 return -ENOSYS;
 172
 173         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 174                         imx_drm_crtc->crtc);
 175
 176         return ret;
 177 }
 178
 179 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 180 {
 181         struct imx_drm_device *imxdrm = drm->dev_private;
 182         struct imx_drm_crtc *imx_drm_crtc;
 183
 184         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 185         if (!imx_drm_crtc)
 186                 return;
 187
 188         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 189                 return;
 190
 191         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 192 }
 193
 194 static void imx_drm_driver_preclose(struct drm_device *drm,
 195                 struct drm_file *file)
 196 {
 197         int i;
 198
 199         if (!file->is_master)
 200                 return;
 201
 202         for (i = 0; i < 4; i++)
 203                 imx_drm_disable_vblank(drm , i);
 204 }
 205
 206 static const struct file_operations imx_drm_driver_fops = {
 207         .owner = THIS_MODULE,
 208         .open = drm_open,
 209         .release = drm_release,
 210         .unlocked_ioctl = drm_ioctl,
 211         .mmap = drm_gem_cma_mmap,
 212         .poll = drm_poll,
 213         .read = drm_read,
 214         .llseek = noop_llseek,
 215 };
 216
 217 static struct imx_drm_device *imx_drm_device;
 218
 219 static struct imx_drm_device *__imx_drm_device(void)
 220 {
 221         return imx_drm_device;
 222 }
 223
 224 struct drm_device *imx_drm_device_get(void)
 225 {
 226         struct imx_drm_device *imxdrm = __imx_drm_device();
 227         struct imx_drm_encoder *enc;
 228         struct imx_drm_connector *con;
 229         struct imx_drm_crtc *crtc;
 230
 231         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 232                 if (!try_module_get(enc->owner)) {
 233                         dev_err(imxdrm->dev, "could not get module %s\n",
 234                                         module_name(enc->owner));
 235                         goto unwind_enc;
 236                 }
 237         }
 238
 239         list_for_each_entry(con, &imxdrm->connector_list, list) {
 240                 if (!try_module_get(con->owner)) {
 241                         dev_err(imxdrm->dev, "could not get module %s\n",
 242                                         module_name(con->owner));
 243                         goto unwind_con;
 244                 }
 245         }
 246
 247         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 248                 if (!try_module_get(crtc->owner)) {
 249                         dev_err(imxdrm->dev, "could not get module %s\n",
 250                                         module_name(crtc->owner));
 251                         goto unwind_crtc;
 252                 }
 253         }
 254
 255         return imxdrm->drm;
 256
 257 unwind_crtc:
 258         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 259                 module_put(crtc->owner);
 260 unwind_con:
 261         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 262                 module_put(con->owner);
 263 unwind_enc:
 264         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 265                 module_put(enc->owner);
 266
 267         mutex_unlock(&imxdrm->mutex);
 268
 269         return NULL;
 270
 271 }
 272 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 273
 274 void imx_drm_device_put(void)
 275 {
 276         struct imx_drm_device *imxdrm = __imx_drm_device();
 277         struct imx_drm_encoder *enc;
 278         struct imx_drm_connector *con;
 279         struct imx_drm_crtc *crtc;
 280
 281         mutex_lock(&imxdrm->mutex);
 282
 283         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 284                 module_put(crtc->owner);
 285
 286         list_for_each_entry(con, &imxdrm->connector_list, list)
 287                 module_put(con->owner);
 288
 289         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 290                 module_put(enc->owner);
 291
 292         mutex_unlock(&imxdrm->mutex);
 293 }
 294 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 295
 296 static int drm_mode_group_reinit(struct drm_device *dev)
 297 {
 298         struct drm_mode_group *group = &dev->primary->mode_group;
 299         uint32_t *id_list = group->id_list;
 300         int ret;
 301
 302         ret = drm_mode_group_init_legacy_group(dev, group);
 303         if (ret < 0)
 304                 return ret;
 305
 306         kfree(id_list);
 307         return 0;
 308 }
 309
 310 /*
 311  * register an encoder to the drm core
 312  */
 313 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 314 {
 315         struct imx_drm_device *imxdrm = __imx_drm_device();
 316
 317         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 318
 319         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 320                         imx_drm_encoder->encoder->funcs,
 321                         imx_drm_encoder->encoder->encoder_type);
 322
 323         drm_mode_group_reinit(imxdrm->drm);
 324
 325         return 0;
 326 }
 327
 328 /*
 329  * unregister an encoder from the drm core
 330  */
 331 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 332                 *imx_drm_encoder)
 333 {
 334         struct imx_drm_device *imxdrm = __imx_drm_device();
 335
 336         drm_encoder_cleanup(imx_drm_encoder->encoder);
 337
 338         drm_mode_group_reinit(imxdrm->drm);
 339 }
 340
 341 /*
 342  * register a connector to the drm core
 343  */
 344 static int imx_drm_connector_register(
 345                 struct imx_drm_connector *imx_drm_connector)
 346 {
 347         struct imx_drm_device *imxdrm = __imx_drm_device();
 348
 349         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 350                         imx_drm_connector->connector->funcs,
 351                         imx_drm_connector->connector->connector_type);
 352         drm_mode_group_reinit(imxdrm->drm);
 353
 354         return drm_sysfs_connector_add(imx_drm_connector->connector);
 355 }
 356
 357 /*
 358  * unregister a connector from the drm core
 359  */
 360 static void imx_drm_connector_unregister(
 361                 struct imx_drm_connector *imx_drm_connector)
 362 {
 363         struct imx_drm_device *imxdrm = __imx_drm_device();
 364
 365         drm_sysfs_connector_remove(imx_drm_connector->connector);
 366         drm_connector_cleanup(imx_drm_connector->connector);
 367
 368         drm_mode_group_reinit(imxdrm->drm);
 369 }
 370
 371 /*
 372  * register a crtc to the drm core
 373  */
 374 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 375 {
 376         struct imx_drm_device *imxdrm = __imx_drm_device();
 377         int ret;
 378
 379         drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 380                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 381         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 382         if (ret)
 383                 return ret;
 384
 385         drm_crtc_helper_add(imx_drm_crtc->crtc,
 386                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 387
 388         drm_mode_group_reinit(imxdrm->drm);
 389
 390         return 0;
 391 }
 392
 393 /*
 394  * Called by the CRTC driver when all CRTCs are registered. This
 395  * puts all the pieces together and initializes the driver.
 396  * Once this is called no more CRTCs can be registered since
 397  * the drm core has hardcoded the number of crtcs in several
 398  * places.
 399  */
 400 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 401 {
 402         struct imx_drm_device *imxdrm = __imx_drm_device();
 403         int ret;
 404
 405         imxdrm->drm = drm;
 406
 407         drm->dev_private = imxdrm;
 408
 409         /*
 410          * enable drm irq mode.
 411          * - with irq_enabled = true, we can use the vblank feature.
 412          *
 413          * P.S. note that we wouldn't use drm irq handler but
 414          *      just specific driver own one instead because
 415          *      drm framework supports only one irq handler and
 416          *      drivers can well take care of their interrupts
 417          */
 418         drm->irq_enabled = true;
 419
 420         drm_mode_config_init(drm);
 421         imx_drm_mode_config_init(drm);
 422
 423         mutex_lock(&imxdrm->mutex);
 424
 425         drm_kms_helper_poll_init(imxdrm->drm);
 426
 427         /* setup the grouping for the legacy output */
 428         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 429                         &imxdrm->drm->primary->mode_group);
 430         if (ret)
 431                 goto err_init;
 432
 433         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 434         if (ret)
 435                 goto err_init;
 436
 437         /*
 438          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 439          * by drm timer once a current process gives up ownership of
 440          * vblank event.(after drm_vblank_put function is called)
 441          */
 442         imxdrm->drm->vblank_disable_allowed = true;
 443
 444         if (!imx_drm_device_get())
 445                 ret = -EINVAL;
 446
 447         ret = 0;
 448
 449 err_init:
 450         mutex_unlock(&imxdrm->mutex);
 451
 452         return ret;
 453 }
 454
 455 static void imx_drm_update_possible_crtcs(void)
 456 {
 457         struct imx_drm_device *imxdrm = __imx_drm_device();
 458         struct imx_drm_crtc *imx_drm_crtc;
 459         struct imx_drm_encoder *enc;
 460         struct crtc_cookie *cookie;
 461
 462         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 463                 u32 possible_crtcs = 0;
 464
 465                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 466                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 467                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 468                                                 imx_drm_crtc->cookie.id == cookie->id) {
 469                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 470                                 }
 471                         }
 472                 }
 473                 enc->encoder->possible_crtcs = possible_crtcs;
 474                 enc->encoder->possible_clones = possible_crtcs;
 475         }
 476 }
 477
 478 /*
 479  * imx_drm_add_crtc - add a new crtc
 480  *
 481  * The return value if !NULL is a cookie for the caller to pass to
 482  * imx_drm_remove_crtc later.
 483  */
 484 int imx_drm_add_crtc(struct drm_crtc *crtc,
 485                 struct imx_drm_crtc **new_crtc,
 486                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 487                 struct module *owner, void *cookie, int id)
 488 {
 489         struct imx_drm_device *imxdrm = __imx_drm_device();
 490         struct imx_drm_crtc *imx_drm_crtc;
 491         int ret;
 492
 493         mutex_lock(&imxdrm->mutex);
 494
 495         if (imxdrm->drm->open_count) {
 496                 ret = -EBUSY;
 497                 goto err_busy;
 498         }
 499
 500         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 501         if (!imx_drm_crtc) {
 502                 ret = -ENOMEM;
 503                 goto err_alloc;
 504         }
 505
 506         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 507         imx_drm_crtc->pipe = imxdrm->pipes++;
 508         imx_drm_crtc->cookie.cookie = cookie;
 509         imx_drm_crtc->cookie.id = id;
 510
 511         imx_drm_crtc->crtc = crtc;
 512         imx_drm_crtc->imxdrm = imxdrm;
 513
 514         imx_drm_crtc->owner = owner;
 515
 516         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 517
 518         *new_crtc = imx_drm_crtc;
 519
 520         ret = imx_drm_crtc_register(imx_drm_crtc);
 521         if (ret)
 522                 goto err_register;
 523
 524         imx_drm_update_possible_crtcs();
 525
 526         mutex_unlock(&imxdrm->mutex);
 527
 528         return 0;
 529
 530 err_register:
 531         kfree(imx_drm_crtc);
 532 err_alloc:
 533 err_busy:
 534         mutex_unlock(&imxdrm->mutex);
 535         return ret;
 536 }
 537 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 538
 539 /*
 540  * imx_drm_remove_crtc - remove a crtc
 541  */
 542 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 543 {
 544         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 545
 546         mutex_lock(&imxdrm->mutex);
 547
 548         drm_crtc_cleanup(imx_drm_crtc->crtc);
 549
 550         list_del(&imx_drm_crtc->list);
 551
 552         drm_mode_group_reinit(imxdrm->drm);
 553
 554         mutex_unlock(&imxdrm->mutex);
 555
 556         kfree(imx_drm_crtc);
 557
 558         return 0;
 559 }
 560 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 561
 562 /*
 563  * imx_drm_add_encoder - add a new encoder
 564  */
 565 int imx_drm_add_encoder(struct drm_encoder *encoder,
 566                 struct imx_drm_encoder **newenc, struct module *owner)
 567 {
 568         struct imx_drm_device *imxdrm = __imx_drm_device();
 569         struct imx_drm_encoder *imx_drm_encoder;
 570         int ret;
 571
 572         mutex_lock(&imxdrm->mutex);
 573
 574         if (imxdrm->drm->open_count) {
 575                 ret = -EBUSY;
 576                 goto err_busy;
 577         }
 578
 579         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 580         if (!imx_drm_encoder) {
 581                 ret = -ENOMEM;
 582                 goto err_alloc;
 583         }
 584
 585         imx_drm_encoder->encoder = encoder;
 586         imx_drm_encoder->owner = owner;
 587
 588         ret = imx_drm_encoder_register(imx_drm_encoder);
 589         if (ret) {
 590                 ret = -ENOMEM;
 591                 goto err_register;
 592         }
 593
 594         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 595
 596         *newenc = imx_drm_encoder;
 597
 598         mutex_unlock(&imxdrm->mutex);
 599
 600         return 0;
 601
 602 err_register:
 603         kfree(imx_drm_encoder);
 604 err_alloc:
 605 err_busy:
 606         mutex_unlock(&imxdrm->mutex);
 607
 608         return ret;
 609 }
 610 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 611
 612 int imx_drm_encoder_add_possible_crtcs(
 613                 struct imx_drm_encoder *imx_drm_encoder,
 614                 struct device_node *np)
 615 {
 616         struct imx_drm_device *imxdrm = __imx_drm_device();
 617         struct of_phandle_args args;
 618         struct crtc_cookie *c;
 619         int ret = 0;
 620         int i;
 621
 622         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 623                 return -EBUSY;
 624
 625         for (i = 0; !ret; i++) {
 626                 ret = of_parse_phandle_with_args(np, "crtcs",
 627                                 "#crtc-cells", i, &args);
 628                 if (ret < 0)
 629                         break;
 630
 631                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 632                 if (!c) {
 633                         of_node_put(args.np);
 634                         return -ENOMEM;
 635                 }
 636
 637                 c->cookie = args.np;
 638                 c->id = args.args_count > 0 ? args.args[0] : 0;
 639
 640                 of_node_put(args.np);
 641
 642                 mutex_lock(&imxdrm->mutex);
 643
 644                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 645
 646                 mutex_unlock(&imxdrm->mutex);
 647         }
 648
 649         imx_drm_update_possible_crtcs();
 650
 651         return 0;
 652 }
 653 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 654
 655 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 656                 struct drm_crtc *crtc)
 657 {
 658         struct imx_drm_device *imxdrm = __imx_drm_device();
 659         struct imx_drm_crtc *imx_crtc;
 660         int i = 0;
 661
 662         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 663                 if (imx_crtc->crtc == crtc)
 664                         goto found;
 665                 i++;
 666         }
 667
 668         return -EINVAL;
 669 found:
 670         return i;
 671 }
 672 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 673
 674 /*
 675  * imx_drm_remove_encoder - remove an encoder
 676  */
 677 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 678 {
 679         struct imx_drm_device *imxdrm = __imx_drm_device();
 680         struct crtc_cookie *c, *tmp;
 681
 682         mutex_lock(&imxdrm->mutex);
 683
 684         imx_drm_encoder_unregister(imx_drm_encoder);
 685
 686         list_del(&imx_drm_encoder->list);
 687
 688         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 689                         list)
 690                 kfree(c);
 691
 692         mutex_unlock(&imxdrm->mutex);
 693
 694         kfree(imx_drm_encoder);
 695
 696         return 0;
 697 }
 698 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 699
 700 /*
 701  * imx_drm_add_connector - add a connector
 702  */
 703 int imx_drm_add_connector(struct drm_connector *connector,
 704                 struct imx_drm_connector **new_con,
 705                 struct module *owner)
 706 {
 707         struct imx_drm_device *imxdrm = __imx_drm_device();
 708         struct imx_drm_connector *imx_drm_connector;
 709         int ret;
 710
 711         mutex_lock(&imxdrm->mutex);
 712
 713         if (imxdrm->drm->open_count) {
 714                 ret = -EBUSY;
 715                 goto err_busy;
 716         }
 717
 718         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 719         if (!imx_drm_connector) {
 720                 ret = -ENOMEM;
 721                 goto err_alloc;
 722         }
 723
 724         imx_drm_connector->connector = connector;
 725         imx_drm_connector->owner = owner;
 726
 727         ret = imx_drm_connector_register(imx_drm_connector);
 728         if (ret)
 729                 goto err_register;
 730
 731         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 732
 733         *new_con = imx_drm_connector;
 734
 735         mutex_unlock(&imxdrm->mutex);
 736
 737         return 0;
 738
 739 err_register:
 740         kfree(imx_drm_connector);
 741 err_alloc:
 742 err_busy:
 743         mutex_unlock(&imxdrm->mutex);
 744
 745         return ret;
 746 }
 747 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 748
 749 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 750 {
 751         struct imx_drm_device *imxdrm = __imx_drm_device();
 752
 753         imxdrm->fbhelper = fbdev_helper;
 754 }
 755 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 756
 757 /*
 758  * imx_drm_remove_connector - remove a connector
 759  */
 760 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 761 {
 762         struct imx_drm_device *imxdrm = __imx_drm_device();
 763
 764         mutex_lock(&imxdrm->mutex);
 765
 766         imx_drm_connector_unregister(imx_drm_connector);
 767
 768         list_del(&imx_drm_connector->list);
 769
 770         mutex_unlock(&imxdrm->mutex);
 771
 772         kfree(imx_drm_connector);
 773
 774         return 0;
 775 }
 776 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 777
 778 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 779         /* none so far */
 780 };
 781
 782 static struct drm_driver imx_drm_driver = {
 783         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 784         .load                   = imx_drm_driver_load,
 785         .unload                 = imx_drm_driver_unload,
 786         .lastclose              = imx_drm_driver_lastclose,
 787         .preclose               = imx_drm_driver_preclose,
 788         .gem_free_object        = drm_gem_cma_free_object,
 789         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 790         .dumb_create            = drm_gem_cma_dumb_create,
 791         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 792         .dumb_destroy           = drm_gem_dumb_destroy,
 793
 794         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 795         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 796         .gem_prime_import       = drm_gem_prime_import,
 797         .gem_prime_export       = drm_gem_prime_export,
 798         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 799         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 800         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 801         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 802         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 803         .get_vblank_counter     = drm_vblank_count,
 804         .enable_vblank          = imx_drm_enable_vblank,
 805         .disable_vblank         = imx_drm_disable_vblank,
 806         .ioctls                 = imx_drm_ioctls,
 807         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 808         .fops                   = &imx_drm_driver_fops,
 809         .name                   = "imx-drm",
 810         .desc                   = "i.MX DRM graphics",
 811         .date                   = "20120507",
 812         .major                  = 1,
 813         .minor                  = 0,
 814         .patchlevel             = 0,
 815 };
 816
 817 static int imx_drm_platform_probe(struct platform_device *pdev)
 818 {
 819         int ret;
 820
 821         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 822         if (ret)
 823                 return ret;
 824
 825         imx_drm_device->dev = &pdev->dev;
 826
 827         return drm_platform_init(&imx_drm_driver, pdev);
 828 }
 829
 830 static int imx_drm_platform_remove(struct platform_device *pdev)
 831 {
 832         drm_platform_exit(&imx_drm_driver, pdev);
 833
 834         return 0;
 835 }
 836
 837 static struct platform_driver imx_drm_pdrv = {
 838         .probe          = imx_drm_platform_probe,
 839         .remove         = imx_drm_platform_remove,
 840         .driver         = {
 841                 .owner  = THIS_MODULE,
 842                 .name   = "imx-drm",
 843         },
 844 };
 845
 846 static struct platform_device *imx_drm_pdev;
 847
 848 static int __init imx_drm_init(void)
 849 {
 850         int ret;
 851
 852         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 853         if (!imx_drm_device)
 854                 return -ENOMEM;
 855
 856         mutex_init(&imx_drm_device->mutex);
 857         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 858         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 859         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 860
 861         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 862         if (IS_ERR(imx_drm_pdev)) {
 863                 ret = PTR_ERR(imx_drm_pdev);
 864                 goto err_pdev;
 865         }
 866
 867         ret = platform_driver_register(&imx_drm_pdrv);
 868         if (ret)
 869                 goto err_pdrv;
 870
 871         return 0;
 872
 873 err_pdrv:
 874         platform_device_unregister(imx_drm_pdev);
 875 err_pdev:
 876         kfree(imx_drm_device);
 877
 878         return ret;
 879 }
 880
 881 static void __exit imx_drm_exit(void)
 882 {
 883         platform_device_unregister(imx_drm_pdev);
 884         platform_driver_unregister(&imx_drm_pdrv);
 885
 886         kfree(imx_drm_device);
 887 }
 888
 889 module_init(imx_drm_init);
 890 module_exit(imx_drm_exit);
 891
 892 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 893 MODULE_DESCRIPTION("i.MX drm driver core");
 894 MODULE_LICENSE("GPL");