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 #include <linux/component.h>
  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_crtc;
  38
  39 struct imx_drm_device {
  40         struct drm_device                       *drm;
  41         struct device                           *dev;
  42         struct imx_drm_crtc                     *crtc[MAX_CRTC];
  43         struct list_head                        encoder_list;
  44         struct list_head                        connector_list;
  45         struct mutex                            mutex;
  46         int                                     pipes;
  47         struct drm_fbdev_cma                    *fbhelper;
  48 };
  49
  50 struct imx_drm_crtc {
  51         struct drm_crtc                         *crtc;
  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         int                                     mux_id;
  58 };
  59
  60 struct imx_drm_encoder {
  61         struct drm_encoder                      *encoder;
  62         struct list_head                        list;
  63         struct module                           *owner;
  64         struct list_head                        possible_crtcs;
  65 };
  66
  67 struct imx_drm_connector {
  68         struct drm_connector                    *connector;
  69         struct list_head                        list;
  70         struct module                           *owner;
  71 };
  72
  73 static struct imx_drm_device *__imx_drm_device(void);
  74
  75 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
  76 {
  77         return crtc->pipe;
  78 }
  79 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
  80
  81 static void imx_drm_driver_lastclose(struct drm_device *drm)
  82 {
  83         struct imx_drm_device *imxdrm = drm->dev_private;
  84
  85         if (imxdrm->fbhelper)
  86                 drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  87 }
  88
  89 static int imx_drm_driver_unload(struct drm_device *drm)
  90 {
  91         struct imx_drm_device *imxdrm = drm->dev_private;
  92
  93         component_unbind_all(drm->dev, drm);
  94
  95         imx_drm_device_put();
  96
  97         drm_vblank_cleanup(drm);
  98         drm_kms_helper_poll_fini(drm);
  99         drm_mode_config_cleanup(drm);
 100
 101         return 0;
 102 }
 103
 104 struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
 105 {
 106         struct imx_drm_device *imxdrm = __imx_drm_device();
 107         unsigned i;
 108
 109         for (i = 0; i < MAX_CRTC; i++)
 110                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
 111                         return imxdrm->crtc[i];
 112
 113         return NULL;
 114 }
 115
 116 int imx_drm_panel_format_pins(struct drm_encoder *encoder,
 117                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 118 {
 119         struct imx_drm_crtc_helper_funcs *helper;
 120         struct imx_drm_crtc *imx_crtc;
 121
 122         imx_crtc = imx_drm_find_crtc(encoder->crtc);
 123         if (!imx_crtc)
 124                 return -EINVAL;
 125
 126         helper = &imx_crtc->imx_drm_helper_funcs;
 127         if (helper->set_interface_pix_fmt)
 128                 return helper->set_interface_pix_fmt(encoder->crtc,
 129                                 encoder->encoder_type, interface_pix_fmt,
 130                                 hsync_pin, vsync_pin);
 131         return 0;
 132 }
 133 EXPORT_SYMBOL_GPL(imx_drm_panel_format_pins);
 134
 135 int imx_drm_panel_format(struct drm_encoder *encoder, u32 interface_pix_fmt)
 136 {
 137         return imx_drm_panel_format_pins(encoder, interface_pix_fmt, 2, 3);
 138 }
 139 EXPORT_SYMBOL_GPL(imx_drm_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->crtc->dev, 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->crtc->dev, 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->crtc->dev, 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 = imxdrm->crtc[crtc];
 163         int ret;
 164
 165         if (!imx_drm_crtc)
 166                 return -EINVAL;
 167
 168         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 169                 return -ENOSYS;
 170
 171         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 172                         imx_drm_crtc->crtc);
 173
 174         return ret;
 175 }
 176
 177 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 178 {
 179         struct imx_drm_device *imxdrm = drm->dev_private;
 180         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[crtc];
 181
 182         if (!imx_drm_crtc)
 183                 return;
 184
 185         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 186                 return;
 187
 188         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 189 }
 190
 191 static void imx_drm_driver_preclose(struct drm_device *drm,
 192                 struct drm_file *file)
 193 {
 194         int i;
 195
 196         if (!file->is_master)
 197                 return;
 198
 199         for (i = 0; i < MAX_CRTC; i++)
 200                 imx_drm_disable_vblank(drm, i);
 201 }
 202
 203 static const struct file_operations imx_drm_driver_fops = {
 204         .owner = THIS_MODULE,
 205         .open = drm_open,
 206         .release = drm_release,
 207         .unlocked_ioctl = drm_ioctl,
 208         .mmap = drm_gem_cma_mmap,
 209         .poll = drm_poll,
 210         .read = drm_read,
 211         .llseek = noop_llseek,
 212 };
 213
 214 int imx_drm_connector_mode_valid(struct drm_connector *connector,
 215         struct drm_display_mode *mode)
 216 {
 217         return MODE_OK;
 218 }
 219 EXPORT_SYMBOL(imx_drm_connector_mode_valid);
 220
 221 static struct imx_drm_device *imx_drm_device;
 222
 223 static struct imx_drm_device *__imx_drm_device(void)
 224 {
 225         return imx_drm_device;
 226 }
 227
 228 struct drm_device *imx_drm_device_get(void)
 229 {
 230         struct imx_drm_device *imxdrm = __imx_drm_device();
 231         struct imx_drm_encoder *enc;
 232         struct imx_drm_connector *con;
 233         struct imx_drm_crtc *crtc;
 234
 235         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 236                 if (!try_module_get(enc->owner)) {
 237                         dev_err(imxdrm->dev, "could not get module %s\n",
 238                                         module_name(enc->owner));
 239                         goto unwind_enc;
 240                 }
 241         }
 242
 243         list_for_each_entry(con, &imxdrm->connector_list, list) {
 244                 if (!try_module_get(con->owner)) {
 245                         dev_err(imxdrm->dev, "could not get module %s\n",
 246                                         module_name(con->owner));
 247                         goto unwind_con;
 248                 }
 249         }
 250
 251         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 252                 if (!try_module_get(crtc->owner)) {
 253                         dev_err(imxdrm->dev, "could not get module %s\n",
 254                                         module_name(crtc->owner));
 255                         goto unwind_crtc;
 256                 }
 257         }
 258
 259         return imxdrm->drm;
 260
 261 unwind_crtc:
 262         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 263                 module_put(crtc->owner);
 264 unwind_con:
 265         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 266                 module_put(con->owner);
 267 unwind_enc:
 268         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 269                 module_put(enc->owner);
 270
 271         mutex_unlock(&imxdrm->mutex);
 272
 273         return NULL;
 274
 275 }
 276 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 277
 278 void imx_drm_device_put(void)
 279 {
 280         struct imx_drm_device *imxdrm = __imx_drm_device();
 281         struct imx_drm_encoder *enc;
 282         struct imx_drm_connector *con;
 283         struct imx_drm_crtc *crtc;
 284
 285         mutex_lock(&imxdrm->mutex);
 286
 287         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 288                 module_put(crtc->owner);
 289
 290         list_for_each_entry(con, &imxdrm->connector_list, list)
 291                 module_put(con->owner);
 292
 293         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 294                 module_put(enc->owner);
 295
 296         mutex_unlock(&imxdrm->mutex);
 297 }
 298 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 299
 300 static int drm_mode_group_reinit(struct drm_device *dev)
 301 {
 302         struct drm_mode_group *group = &dev->primary->mode_group;
 303         uint32_t *id_list = group->id_list;
 304         int ret;
 305
 306         ret = drm_mode_group_init_legacy_group(dev, group);
 307         if (ret < 0)
 308                 return ret;
 309
 310         kfree(id_list);
 311         return 0;
 312 }
 313
 314 /*
 315  * register an encoder to the drm core
 316  */
 317 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 318 {
 319         struct imx_drm_device *imxdrm = __imx_drm_device();
 320
 321         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 322
 323         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 324                         imx_drm_encoder->encoder->funcs,
 325                         imx_drm_encoder->encoder->encoder_type);
 326
 327         drm_mode_group_reinit(imxdrm->drm);
 328
 329         return 0;
 330 }
 331
 332 /*
 333  * unregister an encoder from the drm core
 334  */
 335 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 336                 *imx_drm_encoder)
 337 {
 338         struct imx_drm_device *imxdrm = __imx_drm_device();
 339
 340         drm_encoder_cleanup(imx_drm_encoder->encoder);
 341
 342         drm_mode_group_reinit(imxdrm->drm);
 343 }
 344
 345 /*
 346  * register a connector to the drm core
 347  */
 348 static int imx_drm_connector_register(
 349                 struct imx_drm_connector *imx_drm_connector)
 350 {
 351         struct imx_drm_device *imxdrm = __imx_drm_device();
 352
 353         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 354                         imx_drm_connector->connector->funcs,
 355                         imx_drm_connector->connector->connector_type);
 356         drm_mode_group_reinit(imxdrm->drm);
 357
 358         return drm_sysfs_connector_add(imx_drm_connector->connector);
 359 }
 360
 361 /*
 362  * unregister a connector from the drm core
 363  */
 364 static void imx_drm_connector_unregister(
 365                 struct imx_drm_connector *imx_drm_connector)
 366 {
 367         struct imx_drm_device *imxdrm = __imx_drm_device();
 368
 369         drm_sysfs_connector_remove(imx_drm_connector->connector);
 370         drm_connector_cleanup(imx_drm_connector->connector);
 371
 372         drm_mode_group_reinit(imxdrm->drm);
 373 }
 374
 375 /*
 376  * Main DRM initialisation. This binds, initialises and registers
 377  * with DRM the subcomponents of the driver.
 378  */
 379 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 380 {
 381         struct imx_drm_device *imxdrm = __imx_drm_device();
 382         int ret;
 383
 384         imxdrm->drm = drm;
 385
 386         drm->dev_private = imxdrm;
 387
 388         /*
 389          * enable drm irq mode.
 390          * - with irq_enabled = true, we can use the vblank feature.
 391          *
 392          * P.S. note that we wouldn't use drm irq handler but
 393          *      just specific driver own one instead because
 394          *      drm framework supports only one irq handler and
 395          *      drivers can well take care of their interrupts
 396          */
 397         drm->irq_enabled = true;
 398
 399         drm_mode_config_init(drm);
 400         imx_drm_mode_config_init(drm);
 401
 402         mutex_lock(&imxdrm->mutex);
 403
 404         drm_kms_helper_poll_init(drm);
 405
 406         /* setup the grouping for the legacy output */
 407         ret = drm_mode_group_init_legacy_group(drm,
 408                         &drm->primary->mode_group);
 409         if (ret)
 410                 goto err_kms;
 411
 412         ret = drm_vblank_init(drm, MAX_CRTC);
 413         if (ret)
 414                 goto err_kms;
 415
 416         /*
 417          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 418          * by drm timer once a current process gives up ownership of
 419          * vblank event.(after drm_vblank_put function is called)
 420          */
 421         drm->vblank_disable_allowed = true;
 422
 423         if (!imx_drm_device_get()) {
 424                 ret = -EINVAL;
 425                 goto err_vblank;
 426         }
 427
 428         platform_set_drvdata(drm->platformdev, drm);
 429         mutex_unlock(&imxdrm->mutex);
 430
 431         /* Now try and bind all our sub-components */
 432         ret = component_bind_all(drm->dev, drm);
 433         if (ret)
 434                 goto err_relock;
 435         return 0;
 436
 437 err_relock:
 438         mutex_lock(&imxdrm->mutex);
 439 err_vblank:
 440         drm_vblank_cleanup(drm);
 441 err_kms:
 442         drm_kms_helper_poll_fini(drm);
 443         drm_mode_config_cleanup(drm);
 444         mutex_unlock(&imxdrm->mutex);
 445
 446         return ret;
 447 }
 448
 449 static void imx_drm_update_possible_crtcs(void)
 450 {
 451         struct imx_drm_device *imxdrm = __imx_drm_device();
 452         struct imx_drm_crtc *imx_drm_crtc;
 453         struct imx_drm_encoder *enc;
 454         struct crtc_cookie *cookie;
 455
 456         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 457                 u32 possible_crtcs = 0;
 458
 459                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 460                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 461                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 462                                                 imx_drm_crtc->cookie.id == cookie->id) {
 463                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 464                                 }
 465                         }
 466                 }
 467                 enc->encoder->possible_crtcs = possible_crtcs;
 468                 enc->encoder->possible_clones = possible_crtcs;
 469         }
 470 }
 471
 472 /*
 473  * imx_drm_add_crtc - add a new crtc
 474  *
 475  * The return value if !NULL is a cookie for the caller to pass to
 476  * imx_drm_remove_crtc later.
 477  */
 478 int imx_drm_add_crtc(struct drm_crtc *crtc,
 479                 struct imx_drm_crtc **new_crtc,
 480                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 481                 struct module *owner, void *cookie, int id)
 482 {
 483         struct imx_drm_device *imxdrm = __imx_drm_device();
 484         struct imx_drm_crtc *imx_drm_crtc;
 485         int ret;
 486
 487         mutex_lock(&imxdrm->mutex);
 488
 489         /*
 490          * The vblank arrays are dimensioned by MAX_CRTC - we can't
 491          * pass IDs greater than this to those functions.
 492          */
 493         if (imxdrm->pipes >= MAX_CRTC) {
 494                 ret = -EINVAL;
 495                 goto err_busy;
 496         }
 497
 498         if (imxdrm->drm->open_count) {
 499                 ret = -EBUSY;
 500                 goto err_busy;
 501         }
 502
 503         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 504         if (!imx_drm_crtc) {
 505                 ret = -ENOMEM;
 506                 goto err_alloc;
 507         }
 508
 509         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 510         imx_drm_crtc->pipe = imxdrm->pipes++;
 511         imx_drm_crtc->cookie.cookie = cookie;
 512         imx_drm_crtc->cookie.id = id;
 513         imx_drm_crtc->mux_id = imx_drm_crtc->pipe;
 514         imx_drm_crtc->crtc = crtc;
 515         imx_drm_crtc->imxdrm = imxdrm;
 516
 517         imx_drm_crtc->owner = owner;
 518
 519         imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
 520
 521         *new_crtc = imx_drm_crtc;
 522
 523         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 524         if (ret)
 525                 goto err_register;
 526
 527         drm_crtc_helper_add(crtc,
 528                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 529
 530         drm_crtc_init(imxdrm->drm, crtc,
 531                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 532
 533         drm_mode_group_reinit(imxdrm->drm);
 534
 535         imx_drm_update_possible_crtcs();
 536
 537         mutex_unlock(&imxdrm->mutex);
 538
 539         return 0;
 540
 541 err_register:
 542         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
 543         kfree(imx_drm_crtc);
 544 err_alloc:
 545 err_busy:
 546         mutex_unlock(&imxdrm->mutex);
 547         return ret;
 548 }
 549 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 550
 551 /*
 552  * imx_drm_remove_crtc - remove a crtc
 553  */
 554 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 555 {
 556         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 557
 558         mutex_lock(&imxdrm->mutex);
 559
 560         drm_crtc_cleanup(imx_drm_crtc->crtc);
 561
 562         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
 563
 564         drm_mode_group_reinit(imxdrm->drm);
 565
 566         mutex_unlock(&imxdrm->mutex);
 567
 568         kfree(imx_drm_crtc);
 569
 570         return 0;
 571 }
 572 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 573
 574 /*
 575  * imx_drm_add_encoder - add a new encoder
 576  */
 577 int imx_drm_add_encoder(struct drm_encoder *encoder,
 578                 struct imx_drm_encoder **newenc, struct module *owner)
 579 {
 580         struct imx_drm_device *imxdrm = __imx_drm_device();
 581         struct imx_drm_encoder *imx_drm_encoder;
 582         int ret;
 583
 584         mutex_lock(&imxdrm->mutex);
 585
 586         if (imxdrm->drm->open_count) {
 587                 ret = -EBUSY;
 588                 goto err_busy;
 589         }
 590
 591         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 592         if (!imx_drm_encoder) {
 593                 ret = -ENOMEM;
 594                 goto err_alloc;
 595         }
 596
 597         imx_drm_encoder->encoder = encoder;
 598         imx_drm_encoder->owner = owner;
 599
 600         ret = imx_drm_encoder_register(imx_drm_encoder);
 601         if (ret) {
 602                 ret = -ENOMEM;
 603                 goto err_register;
 604         }
 605
 606         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 607
 608         *newenc = imx_drm_encoder;
 609
 610         mutex_unlock(&imxdrm->mutex);
 611
 612         return 0;
 613
 614 err_register:
 615         kfree(imx_drm_encoder);
 616 err_alloc:
 617 err_busy:
 618         mutex_unlock(&imxdrm->mutex);
 619
 620         return ret;
 621 }
 622 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 623
 624 int imx_drm_encoder_add_possible_crtcs(
 625                 struct imx_drm_encoder *imx_drm_encoder,
 626                 struct device_node *np)
 627 {
 628         struct imx_drm_device *imxdrm = __imx_drm_device();
 629         struct of_phandle_args args;
 630         struct crtc_cookie *c;
 631         int ret = 0;
 632         int i;
 633
 634         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 635                 return -EBUSY;
 636
 637         for (i = 0; !ret; i++) {
 638                 ret = of_parse_phandle_with_args(np, "crtcs",
 639                                 "#crtc-cells", i, &args);
 640                 if (ret < 0)
 641                         break;
 642
 643                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 644                 if (!c) {
 645                         of_node_put(args.np);
 646                         return -ENOMEM;
 647                 }
 648
 649                 c->cookie = args.np;
 650                 c->id = args.args_count > 0 ? args.args[0] : 0;
 651
 652                 of_node_put(args.np);
 653
 654                 mutex_lock(&imxdrm->mutex);
 655
 656                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 657
 658                 mutex_unlock(&imxdrm->mutex);
 659         }
 660
 661         imx_drm_update_possible_crtcs();
 662
 663         return 0;
 664 }
 665 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 666
 667 int imx_drm_encoder_get_mux_id(struct drm_encoder *encoder)
 668 {
 669         struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
 670
 671         return imx_crtc ? imx_crtc->mux_id : -EINVAL;
 672 }
 673 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 674
 675 /*
 676  * imx_drm_remove_encoder - remove an encoder
 677  */
 678 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 679 {
 680         struct imx_drm_device *imxdrm = __imx_drm_device();
 681         struct crtc_cookie *c, *tmp;
 682
 683         mutex_lock(&imxdrm->mutex);
 684
 685         imx_drm_encoder_unregister(imx_drm_encoder);
 686
 687         list_del(&imx_drm_encoder->list);
 688
 689         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 690                         list)
 691                 kfree(c);
 692
 693         mutex_unlock(&imxdrm->mutex);
 694
 695         kfree(imx_drm_encoder);
 696
 697         return 0;
 698 }
 699 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 700
 701 /*
 702  * imx_drm_add_connector - add a connector
 703  */
 704 int imx_drm_add_connector(struct drm_connector *connector,
 705                 struct imx_drm_connector **new_con,
 706                 struct module *owner)
 707 {
 708         struct imx_drm_device *imxdrm = __imx_drm_device();
 709         struct imx_drm_connector *imx_drm_connector;
 710         int ret;
 711
 712         mutex_lock(&imxdrm->mutex);
 713
 714         if (imxdrm->drm->open_count) {
 715                 ret = -EBUSY;
 716                 goto err_busy;
 717         }
 718
 719         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 720         if (!imx_drm_connector) {
 721                 ret = -ENOMEM;
 722                 goto err_alloc;
 723         }
 724
 725         imx_drm_connector->connector = connector;
 726         imx_drm_connector->owner = owner;
 727
 728         ret = imx_drm_connector_register(imx_drm_connector);
 729         if (ret)
 730                 goto err_register;
 731
 732         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 733
 734         *new_con = imx_drm_connector;
 735
 736         mutex_unlock(&imxdrm->mutex);
 737
 738         return 0;
 739
 740 err_register:
 741         kfree(imx_drm_connector);
 742 err_alloc:
 743 err_busy:
 744         mutex_unlock(&imxdrm->mutex);
 745
 746         return ret;
 747 }
 748 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 749
 750 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 751 {
 752         struct imx_drm_device *imxdrm = __imx_drm_device();
 753
 754         imxdrm->fbhelper = fbdev_helper;
 755 }
 756 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 757
 758 /*
 759  * imx_drm_remove_connector - remove a connector
 760  */
 761 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 762 {
 763         struct imx_drm_device *imxdrm = __imx_drm_device();
 764
 765         mutex_lock(&imxdrm->mutex);
 766
 767         imx_drm_connector_unregister(imx_drm_connector);
 768
 769         list_del(&imx_drm_connector->list);
 770
 771         mutex_unlock(&imxdrm->mutex);
 772
 773         kfree(imx_drm_connector);
 774
 775         return 0;
 776 }
 777 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 778
 779 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 780         /* none so far */
 781 };
 782
 783 static struct drm_driver imx_drm_driver = {
 784         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 785         .load                   = imx_drm_driver_load,
 786         .unload                 = imx_drm_driver_unload,
 787         .lastclose              = imx_drm_driver_lastclose,
 788         .preclose               = imx_drm_driver_preclose,
 789         .gem_free_object        = drm_gem_cma_free_object,
 790         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 791         .dumb_create            = drm_gem_cma_dumb_create,
 792         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 793         .dumb_destroy           = drm_gem_dumb_destroy,
 794
 795         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 796         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 797         .gem_prime_import       = drm_gem_prime_import,
 798         .gem_prime_export       = drm_gem_prime_export,
 799         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 800         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 801         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 802         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 803         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 804         .get_vblank_counter     = drm_vblank_count,
 805         .enable_vblank          = imx_drm_enable_vblank,
 806         .disable_vblank         = imx_drm_disable_vblank,
 807         .ioctls                 = imx_drm_ioctls,
 808         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 809         .fops                   = &imx_drm_driver_fops,
 810         .name                   = "imx-drm",
 811         .desc                   = "i.MX DRM graphics",
 812         .date                   = "20120507",
 813         .major                  = 1,
 814         .minor                  = 0,
 815         .patchlevel             = 0,
 816 };
 817
 818 static int compare_parent_of(struct device *dev, void *data)
 819 {
 820         struct of_phandle_args *args = data;
 821         return dev->parent && dev->parent->of_node == args->np;
 822 }
 823
 824 static int compare_of(struct device *dev, void *data)
 825 {
 826         return dev->of_node == data;
 827 }
 828
 829 static int imx_drm_add_components(struct device *master, struct master *m)
 830 {
 831         struct device_node *np = master->of_node;
 832         unsigned i;
 833         int ret;
 834
 835         for (i = 0; ; i++) {
 836                 struct of_phandle_args args;
 837
 838                 ret = of_parse_phandle_with_fixed_args(np, "crtcs", 1,
 839                                                        i, &args);
 840                 if (ret)
 841                         break;
 842
 843                 ret = component_master_add_child(m, compare_parent_of, &args);
 844                 of_node_put(args.np);
 845
 846                 if (ret)
 847                         return ret;
 848         }
 849
 850         for (i = 0; ; i++) {
 851                 struct device_node *node;
 852
 853                 node = of_parse_phandle(np, "connectors", i);
 854                 if (!node)
 855                         break;
 856
 857                 ret = component_master_add_child(m, compare_of, node);
 858                 of_node_put(node);
 859
 860                 if (ret)
 861                         return ret;
 862         }
 863         return 0;
 864 }
 865
 866 static int imx_drm_bind(struct device *dev)
 867 {
 868         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
 869 }
 870
 871 static void imx_drm_unbind(struct device *dev)
 872 {
 873         drm_put_dev(dev_get_drvdata(dev));
 874 }
 875
 876 static const struct component_master_ops imx_drm_ops = {
 877         .add_components = imx_drm_add_components,
 878         .bind = imx_drm_bind,
 879         .unbind = imx_drm_unbind,
 880 };
 881
 882 static int imx_drm_platform_probe(struct platform_device *pdev)
 883 {
 884         int ret;
 885
 886         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 887         if (ret)
 888                 return ret;
 889
 890         imx_drm_device->dev = &pdev->dev;
 891
 892         return component_master_add(&pdev->dev, &imx_drm_ops);
 893 }
 894
 895 static int imx_drm_platform_remove(struct platform_device *pdev)
 896 {
 897         component_master_del(&pdev->dev, &imx_drm_ops);
 898         return 0;
 899 }
 900
 901 static const struct of_device_id imx_drm_dt_ids[] = {
 902         { .compatible = "fsl,imx-drm", },
 903         { /* sentinel */ },
 904 };
 905 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 906
 907 static struct platform_driver imx_drm_pdrv = {
 908         .probe          = imx_drm_platform_probe,
 909         .remove         = imx_drm_platform_remove,
 910         .driver         = {
 911                 .owner  = THIS_MODULE,
 912                 .name   = "imx-drm",
 913                 .of_match_table = imx_drm_dt_ids,
 914         },
 915 };
 916
 917 static int __init imx_drm_init(void)
 918 {
 919         int ret;
 920
 921         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 922         if (!imx_drm_device)
 923                 return -ENOMEM;
 924
 925         mutex_init(&imx_drm_device->mutex);
 926         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 927         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 928
 929         ret = platform_driver_register(&imx_drm_pdrv);
 930         if (ret)
 931                 goto err_pdrv;
 932
 933         return 0;
 934
 935 err_pdrv:
 936         kfree(imx_drm_device);
 937
 938         return ret;
 939 }
 940
 941 static void __exit imx_drm_exit(void)
 942 {
 943         platform_driver_unregister(&imx_drm_pdrv);
 944
 945         kfree(imx_drm_device);
 946 }
 947
 948 module_init(imx_drm_init);
 949 module_exit(imx_drm_exit);
 950
 951 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 952 MODULE_DESCRIPTION("i.MX drm driver core");
 953 MODULE_LICENSE("GPL");