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
  76 static void imx_drm_driver_lastclose(struct drm_device *drm)
  77 {
  78         struct imx_drm_device *imxdrm = drm->dev_private;
  79
  80         if (imxdrm->fbhelper)
  81                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  82 }
  83
  84 static int imx_drm_driver_unload(struct drm_device *drm)
  85 {
  86         struct imx_drm_device *imxdrm = drm->dev_private;
  87
  88         imx_drm_device_put();
  89
  90         drm_mode_config_cleanup(imxdrm->drm);
  91         drm_kms_helper_poll_fini(imxdrm->drm);
  92
  93         return 0;
  94 }
  95
  96 /*
  97  * We don't care at all for crtc numbers, but the core expects the
  98  * crtcs to be numbered
  99  */
 100 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
 101                 int num)
 102 {
 103         struct imx_drm_crtc *imx_drm_crtc;
 104
 105         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
 106                 if (imx_drm_crtc->pipe == num)
 107                         return imx_drm_crtc;
 108         return NULL;
 109 }
 110
 111 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
 112                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 113 {
 114         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 115         struct imx_drm_crtc *imx_crtc;
 116         struct imx_drm_crtc_helper_funcs *helper;
 117
 118         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
 119                 if (imx_crtc->crtc == crtc)
 120                         goto found;
 121
 122         return -EINVAL;
 123 found:
 124         helper = &imx_crtc->imx_drm_helper_funcs;
 125         if (helper->set_interface_pix_fmt)
 126                 return helper->set_interface_pix_fmt(crtc,
 127                                 encoder_type, interface_pix_fmt,
 128                                 hsync_pin, vsync_pin);
 129         return 0;
 130 }
 131 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
 132
 133 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
 134                 u32 interface_pix_fmt)
 135 {
 136         return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
 137                                               interface_pix_fmt, 2, 3);
 138 }
 139 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
 140
 141 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 142 {
 143         return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 144 }
 145 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 146
 147 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 148 {
 149         drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 150 }
 151 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 152
 153 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 154 {
 155         drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 156 }
 157 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 158
 159 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 160 {
 161         struct imx_drm_device *imxdrm = drm->dev_private;
 162         struct imx_drm_crtc *imx_drm_crtc;
 163         int ret;
 164
 165         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 166         if (!imx_drm_crtc)
 167                 return -EINVAL;
 168
 169         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 170                 return -ENOSYS;
 171
 172         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 173                         imx_drm_crtc->crtc);
 174
 175         return ret;
 176 }
 177
 178 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 179 {
 180         struct imx_drm_device *imxdrm = drm->dev_private;
 181         struct imx_drm_crtc *imx_drm_crtc;
 182
 183         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 184         if (!imx_drm_crtc)
 185                 return;
 186
 187         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 188                 return;
 189
 190         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 191 }
 192
 193 static void imx_drm_driver_preclose(struct drm_device *drm,
 194                 struct drm_file *file)
 195 {
 196         int i;
 197
 198         if (!file->is_master)
 199                 return;
 200
 201         for (i = 0; i < 4; i++)
 202                 imx_drm_disable_vblank(drm , i);
 203 }
 204
 205 static const struct file_operations imx_drm_driver_fops = {
 206         .owner = THIS_MODULE,
 207         .open = drm_open,
 208         .release = drm_release,
 209         .unlocked_ioctl = drm_ioctl,
 210         .mmap = drm_gem_cma_mmap,
 211         .poll = drm_poll,
 212         .read = drm_read,
 213         .llseek = noop_llseek,
 214 };
 215
 216 static struct imx_drm_device *imx_drm_device;
 217
 218 static struct imx_drm_device *__imx_drm_device(void)
 219 {
 220         return imx_drm_device;
 221 }
 222
 223 struct drm_device *imx_drm_device_get(void)
 224 {
 225         struct imx_drm_device *imxdrm = __imx_drm_device();
 226         struct imx_drm_encoder *enc;
 227         struct imx_drm_connector *con;
 228         struct imx_drm_crtc *crtc;
 229
 230         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 231                 if (!try_module_get(enc->owner)) {
 232                         dev_err(imxdrm->dev, "could not get module %s\n",
 233                                         module_name(enc->owner));
 234                         goto unwind_enc;
 235                 }
 236         }
 237
 238         list_for_each_entry(con, &imxdrm->connector_list, list) {
 239                 if (!try_module_get(con->owner)) {
 240                         dev_err(imxdrm->dev, "could not get module %s\n",
 241                                         module_name(con->owner));
 242                         goto unwind_con;
 243                 }
 244         }
 245
 246         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 247                 if (!try_module_get(crtc->owner)) {
 248                         dev_err(imxdrm->dev, "could not get module %s\n",
 249                                         module_name(crtc->owner));
 250                         goto unwind_crtc;
 251                 }
 252         }
 253
 254         return imxdrm->drm;
 255
 256 unwind_crtc:
 257         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 258                 module_put(crtc->owner);
 259 unwind_con:
 260         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 261                 module_put(con->owner);
 262 unwind_enc:
 263         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 264                 module_put(enc->owner);
 265
 266         mutex_unlock(&imxdrm->mutex);
 267
 268         return NULL;
 269
 270 }
 271 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 272
 273 void imx_drm_device_put(void)
 274 {
 275         struct imx_drm_device *imxdrm = __imx_drm_device();
 276         struct imx_drm_encoder *enc;
 277         struct imx_drm_connector *con;
 278         struct imx_drm_crtc *crtc;
 279
 280         mutex_lock(&imxdrm->mutex);
 281
 282         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 283                 module_put(crtc->owner);
 284
 285         list_for_each_entry(con, &imxdrm->connector_list, list)
 286                 module_put(con->owner);
 287
 288         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 289                 module_put(enc->owner);
 290
 291         mutex_unlock(&imxdrm->mutex);
 292 }
 293 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 294
 295 static int drm_mode_group_reinit(struct drm_device *dev)
 296 {
 297         struct drm_mode_group *group = &dev->primary->mode_group;
 298         uint32_t *id_list = group->id_list;
 299         int ret;
 300
 301         ret = drm_mode_group_init_legacy_group(dev, group);
 302         if (ret < 0)
 303                 return ret;
 304
 305         kfree(id_list);
 306         return 0;
 307 }
 308
 309 /*
 310  * register an encoder to the drm core
 311  */
 312 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 313 {
 314         struct imx_drm_device *imxdrm = __imx_drm_device();
 315
 316         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 317
 318         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 319                         imx_drm_encoder->encoder->funcs,
 320                         imx_drm_encoder->encoder->encoder_type);
 321
 322         drm_mode_group_reinit(imxdrm->drm);
 323
 324         return 0;
 325 }
 326
 327 /*
 328  * unregister an encoder from the drm core
 329  */
 330 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 331                 *imx_drm_encoder)
 332 {
 333         struct imx_drm_device *imxdrm = __imx_drm_device();
 334
 335         drm_encoder_cleanup(imx_drm_encoder->encoder);
 336
 337         drm_mode_group_reinit(imxdrm->drm);
 338 }
 339
 340 /*
 341  * register a connector to the drm core
 342  */
 343 static int imx_drm_connector_register(
 344                 struct imx_drm_connector *imx_drm_connector)
 345 {
 346         struct imx_drm_device *imxdrm = __imx_drm_device();
 347
 348         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 349                         imx_drm_connector->connector->funcs,
 350                         imx_drm_connector->connector->connector_type);
 351         drm_mode_group_reinit(imxdrm->drm);
 352
 353         return drm_sysfs_connector_add(imx_drm_connector->connector);
 354 }
 355
 356 /*
 357  * unregister a connector from the drm core
 358  */
 359 static void imx_drm_connector_unregister(
 360                 struct imx_drm_connector *imx_drm_connector)
 361 {
 362         struct imx_drm_device *imxdrm = __imx_drm_device();
 363
 364         drm_sysfs_connector_remove(imx_drm_connector->connector);
 365         drm_connector_cleanup(imx_drm_connector->connector);
 366
 367         drm_mode_group_reinit(imxdrm->drm);
 368 }
 369
 370 /*
 371  * register a crtc to the drm core
 372  */
 373 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 374 {
 375         struct imx_drm_device *imxdrm = __imx_drm_device();
 376         int ret;
 377
 378         drm_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 379                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 380         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 381         if (ret)
 382                 return ret;
 383
 384         drm_crtc_helper_add(imx_drm_crtc->crtc,
 385                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 386
 387         drm_mode_group_reinit(imxdrm->drm);
 388
 389         return 0;
 390 }
 391
 392 /*
 393  * Called by the CRTC driver when all CRTCs are registered. This
 394  * puts all the pieces together and initializes the driver.
 395  * Once this is called no more CRTCs can be registered since
 396  * the drm core has hardcoded the number of crtcs in several
 397  * places.
 398  */
 399 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 400 {
 401         struct imx_drm_device *imxdrm = __imx_drm_device();
 402         int ret;
 403
 404         imxdrm->drm = drm;
 405
 406         drm->dev_private = imxdrm;
 407
 408         /*
 409          * enable drm irq mode.
 410          * - with irq_enabled = 1, we can use the vblank feature.
 411          *
 412          * P.S. note that we wouldn't use drm irq handler but
 413          *      just specific driver own one instead because
 414          *      drm framework supports only one irq handler and
 415          *      drivers can well take care of their interrupts
 416          */
 417         drm->irq_enabled = 1;
 418
 419         drm_mode_config_init(drm);
 420         imx_drm_mode_config_init(drm);
 421
 422         mutex_lock(&imxdrm->mutex);
 423
 424         drm_kms_helper_poll_init(imxdrm->drm);
 425
 426         /* setup the grouping for the legacy output */
 427         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 428                         &imxdrm->drm->primary->mode_group);
 429         if (ret)
 430                 goto err_init;
 431
 432         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 433         if (ret)
 434                 goto err_init;
 435
 436         /*
 437          * with vblank_disable_allowed = 1, vblank interrupt will be disabled
 438          * by drm timer once a current process gives up ownership of
 439          * vblank event.(after drm_vblank_put function is called)
 440          */
 441         imxdrm->drm->vblank_disable_allowed = 1;
 442
 443         if (!imx_drm_device_get())
 444                 ret = -EINVAL;
 445
 446         ret = 0;
 447
 448 err_init:
 449         mutex_unlock(&imxdrm->mutex);
 450
 451         return ret;
 452 }
 453
 454 static void imx_drm_update_possible_crtcs(void)
 455 {
 456         struct imx_drm_device *imxdrm = __imx_drm_device();
 457         struct imx_drm_crtc *imx_drm_crtc;
 458         struct imx_drm_encoder *enc;
 459         struct crtc_cookie *cookie;
 460
 461         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 462                 u32 possible_crtcs = 0;
 463
 464                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 465                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 466                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 467                                                 imx_drm_crtc->cookie.id == cookie->id) {
 468                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 469                                 }
 470                         }
 471                 }
 472                 enc->encoder->possible_crtcs = possible_crtcs;
 473                 enc->encoder->possible_clones = possible_crtcs;
 474         }
 475 }
 476
 477 /*
 478  * imx_drm_add_crtc - add a new crtc
 479  *
 480  * The return value if !NULL is a cookie for the caller to pass to
 481  * imx_drm_remove_crtc later.
 482  */
 483 int imx_drm_add_crtc(struct drm_crtc *crtc,
 484                 struct imx_drm_crtc **new_crtc,
 485                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 486                 struct module *owner, void *cookie, int id)
 487 {
 488         struct imx_drm_device *imxdrm = __imx_drm_device();
 489         struct imx_drm_crtc *imx_drm_crtc;
 490         int ret;
 491
 492         mutex_lock(&imxdrm->mutex);
 493
 494         if (imxdrm->drm->open_count) {
 495                 ret = -EBUSY;
 496                 goto err_busy;
 497         }
 498
 499         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 500         if (!imx_drm_crtc) {
 501                 ret = -ENOMEM;
 502                 goto err_alloc;
 503         }
 504
 505         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 506         imx_drm_crtc->pipe = imxdrm->pipes++;
 507         imx_drm_crtc->cookie.cookie = cookie;
 508         imx_drm_crtc->cookie.id = id;
 509
 510         imx_drm_crtc->crtc = crtc;
 511         imx_drm_crtc->imxdrm = imxdrm;
 512
 513         imx_drm_crtc->owner = owner;
 514
 515         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 516
 517         *new_crtc = imx_drm_crtc;
 518
 519         ret = imx_drm_crtc_register(imx_drm_crtc);
 520         if (ret)
 521                 goto err_register;
 522
 523         imx_drm_update_possible_crtcs();
 524
 525         mutex_unlock(&imxdrm->mutex);
 526
 527         return 0;
 528
 529 err_register:
 530         kfree(imx_drm_crtc);
 531 err_alloc:
 532 err_busy:
 533         mutex_unlock(&imxdrm->mutex);
 534         return ret;
 535 }
 536 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 537
 538 /*
 539  * imx_drm_remove_crtc - remove a crtc
 540  */
 541 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 542 {
 543         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 544
 545         mutex_lock(&imxdrm->mutex);
 546
 547         drm_crtc_cleanup(imx_drm_crtc->crtc);
 548
 549         list_del(&imx_drm_crtc->list);
 550
 551         drm_mode_group_reinit(imxdrm->drm);
 552
 553         mutex_unlock(&imxdrm->mutex);
 554
 555         kfree(imx_drm_crtc);
 556
 557         return 0;
 558 }
 559 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 560
 561 /*
 562  * imx_drm_add_encoder - add a new encoder
 563  */
 564 int imx_drm_add_encoder(struct drm_encoder *encoder,
 565                 struct imx_drm_encoder **newenc, struct module *owner)
 566 {
 567         struct imx_drm_device *imxdrm = __imx_drm_device();
 568         struct imx_drm_encoder *imx_drm_encoder;
 569         int ret;
 570
 571         mutex_lock(&imxdrm->mutex);
 572
 573         if (imxdrm->drm->open_count) {
 574                 ret = -EBUSY;
 575                 goto err_busy;
 576         }
 577
 578         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 579         if (!imx_drm_encoder) {
 580                 ret = -ENOMEM;
 581                 goto err_alloc;
 582         }
 583
 584         imx_drm_encoder->encoder = encoder;
 585         imx_drm_encoder->owner = owner;
 586
 587         ret = imx_drm_encoder_register(imx_drm_encoder);
 588         if (ret) {
 589                 ret = -ENOMEM;
 590                 goto err_register;
 591         }
 592
 593         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 594
 595         *newenc = imx_drm_encoder;
 596
 597         mutex_unlock(&imxdrm->mutex);
 598
 599         return 0;
 600
 601 err_register:
 602         kfree(imx_drm_encoder);
 603 err_alloc:
 604 err_busy:
 605         mutex_unlock(&imxdrm->mutex);
 606
 607         return ret;
 608 }
 609 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 610
 611 int imx_drm_encoder_add_possible_crtcs(
 612                 struct imx_drm_encoder *imx_drm_encoder,
 613                 struct device_node *np)
 614 {
 615         struct imx_drm_device *imxdrm = __imx_drm_device();
 616         struct of_phandle_args args;
 617         struct crtc_cookie *c;
 618         int ret = 0;
 619         int i;
 620
 621         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 622                 return -EBUSY;
 623
 624         for (i = 0; !ret; i++) {
 625                 ret = of_parse_phandle_with_args(np, "crtcs",
 626                                 "#crtc-cells", i, &args);
 627                 if (ret < 0)
 628                         break;
 629
 630                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 631                 if (!c) {
 632                         of_node_put(args.np);
 633                         return -ENOMEM;
 634                 }
 635
 636                 c->cookie = args.np;
 637                 c->id = args.args_count > 0 ? args.args[0] : 0;
 638
 639                 of_node_put(args.np);
 640
 641                 mutex_lock(&imxdrm->mutex);
 642
 643                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 644
 645                 mutex_unlock(&imxdrm->mutex);
 646         }
 647
 648         imx_drm_update_possible_crtcs();
 649
 650         return 0;
 651 }
 652 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 653
 654 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 655                 struct drm_crtc *crtc)
 656 {
 657         struct imx_drm_device *imxdrm = __imx_drm_device();
 658         struct imx_drm_crtc *imx_crtc;
 659         int i = 0;
 660
 661         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 662                 if (imx_crtc->crtc == crtc)
 663                         goto found;
 664                 i++;
 665         }
 666
 667         return -EINVAL;
 668 found:
 669         return i;
 670 }
 671 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 672
 673 /*
 674  * imx_drm_remove_encoder - remove an encoder
 675  */
 676 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 677 {
 678         struct imx_drm_device *imxdrm = __imx_drm_device();
 679         struct crtc_cookie *c, *tmp;
 680
 681         mutex_lock(&imxdrm->mutex);
 682
 683         imx_drm_encoder_unregister(imx_drm_encoder);
 684
 685         list_del(&imx_drm_encoder->list);
 686
 687         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 688                         list)
 689                 kfree(c);
 690
 691         mutex_unlock(&imxdrm->mutex);
 692
 693         kfree(imx_drm_encoder);
 694
 695         return 0;
 696 }
 697 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 698
 699 /*
 700  * imx_drm_add_connector - add a connector
 701  */
 702 int imx_drm_add_connector(struct drm_connector *connector,
 703                 struct imx_drm_connector **new_con,
 704                 struct module *owner)
 705 {
 706         struct imx_drm_device *imxdrm = __imx_drm_device();
 707         struct imx_drm_connector *imx_drm_connector;
 708         int ret;
 709
 710         mutex_lock(&imxdrm->mutex);
 711
 712         if (imxdrm->drm->open_count) {
 713                 ret = -EBUSY;
 714                 goto err_busy;
 715         }
 716
 717         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 718         if (!imx_drm_connector) {
 719                 ret = -ENOMEM;
 720                 goto err_alloc;
 721         }
 722
 723         imx_drm_connector->connector = connector;
 724         imx_drm_connector->owner = owner;
 725
 726         ret = imx_drm_connector_register(imx_drm_connector);
 727         if (ret)
 728                 goto err_register;
 729
 730         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 731
 732         *new_con = imx_drm_connector;
 733
 734         mutex_unlock(&imxdrm->mutex);
 735
 736         return 0;
 737
 738 err_register:
 739         kfree(imx_drm_connector);
 740 err_alloc:
 741 err_busy:
 742         mutex_unlock(&imxdrm->mutex);
 743
 744         return ret;
 745 }
 746 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 747
 748 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 749 {
 750         struct imx_drm_device *imxdrm = __imx_drm_device();
 751
 752         imxdrm->fbhelper = fbdev_helper;
 753 }
 754 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 755
 756 /*
 757  * imx_drm_remove_connector - remove a connector
 758  */
 759 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 760 {
 761         struct imx_drm_device *imxdrm = __imx_drm_device();
 762
 763         mutex_lock(&imxdrm->mutex);
 764
 765         imx_drm_connector_unregister(imx_drm_connector);
 766
 767         list_del(&imx_drm_connector->list);
 768
 769         mutex_unlock(&imxdrm->mutex);
 770
 771         kfree(imx_drm_connector);
 772
 773         return 0;
 774 }
 775 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 776
 777 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 778         /* none so far */
 779 };
 780
 781 static struct drm_driver imx_drm_driver = {
 782         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 783         .load                   = imx_drm_driver_load,
 784         .unload                 = imx_drm_driver_unload,
 785         .lastclose              = imx_drm_driver_lastclose,
 786         .preclose               = imx_drm_driver_preclose,
 787         .gem_free_object        = drm_gem_cma_free_object,
 788         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 789         .dumb_create            = drm_gem_cma_dumb_create,
 790         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 791         .dumb_destroy           = drm_gem_dumb_destroy,
 792
 793         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 794         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 795         .gem_prime_import       = drm_gem_prime_import,
 796         .gem_prime_export       = drm_gem_prime_export,
 797         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 798         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 799         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 800         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 801         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 802         .get_vblank_counter     = drm_vblank_count,
 803         .enable_vblank          = imx_drm_enable_vblank,
 804         .disable_vblank         = imx_drm_disable_vblank,
 805         .ioctls                 = imx_drm_ioctls,
 806         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 807         .fops                   = &imx_drm_driver_fops,
 808         .name                   = "imx-drm",
 809         .desc                   = "i.MX DRM graphics",
 810         .date                   = "20120507",
 811         .major                  = 1,
 812         .minor                  = 0,
 813         .patchlevel             = 0,
 814 };
 815
 816 static int imx_drm_platform_probe(struct platform_device *pdev)
 817 {
 818         int ret;
 819
 820         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 821         if (ret)
 822                 return ret;
 823
 824         imx_drm_device->dev = &pdev->dev;
 825
 826         return drm_platform_init(&imx_drm_driver, pdev);
 827 }
 828
 829 static int imx_drm_platform_remove(struct platform_device *pdev)
 830 {
 831         drm_platform_exit(&imx_drm_driver, pdev);
 832
 833         return 0;
 834 }
 835
 836 static struct platform_driver imx_drm_pdrv = {
 837         .probe          = imx_drm_platform_probe,
 838         .remove         = imx_drm_platform_remove,
 839         .driver         = {
 840                 .owner  = THIS_MODULE,
 841                 .name   = "imx-drm",
 842         },
 843 };
 844
 845 static struct platform_device *imx_drm_pdev;
 846
 847 static int __init imx_drm_init(void)
 848 {
 849         int ret;
 850
 851         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 852         if (!imx_drm_device)
 853                 return -ENOMEM;
 854
 855         mutex_init(&imx_drm_device->mutex);
 856         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 857         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 858         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 859
 860         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 861         if (IS_ERR(imx_drm_pdev)) {
 862                 ret = PTR_ERR(imx_drm_pdev);
 863                 goto err_pdev;
 864         }
 865
 866         ret = platform_driver_register(&imx_drm_pdrv);
 867         if (ret)
 868                 goto err_pdrv;
 869
 870         return 0;
 871
 872 err_pdrv:
 873         platform_device_unregister(imx_drm_pdev);
 874 err_pdev:
 875         kfree(imx_drm_device);
 876
 877         return ret;
 878 }
 879
 880 static void __exit imx_drm_exit(void)
 881 {
 882         platform_device_unregister(imx_drm_pdev);
 883         platform_driver_unregister(&imx_drm_pdrv);
 884
 885         kfree(imx_drm_device);
 886 }
 887
 888 module_init(imx_drm_init);
 889 module_exit(imx_drm_exit);
 890
 891 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 892 MODULE_DESCRIPTION("i.MX drm driver core");
 893 MODULE_LICENSE("GPL");