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_vblank_cleanup(imxdrm->drm);
  92         drm_kms_helper_poll_fini(imxdrm->drm);
  93         drm_mode_config_cleanup(imxdrm->drm);
  94
  95         return 0;
  96 }
  97
  98 /*
  99  * We don't care at all for crtc numbers, but the core expects the
 100  * crtcs to be numbered
 101  */
 102 static struct imx_drm_crtc *imx_drm_crtc_by_num(struct imx_drm_device *imxdrm,
 103                 int num)
 104 {
 105         struct imx_drm_crtc *imx_drm_crtc;
 106
 107         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list)
 108                 if (imx_drm_crtc->pipe == num)
 109                         return imx_drm_crtc;
 110         return NULL;
 111 }
 112
 113 int imx_drm_crtc_panel_format_pins(struct drm_crtc *crtc, u32 encoder_type,
 114                 u32 interface_pix_fmt, int hsync_pin, int vsync_pin)
 115 {
 116         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
 117         struct imx_drm_crtc *imx_crtc;
 118         struct imx_drm_crtc_helper_funcs *helper;
 119
 120         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list)
 121                 if (imx_crtc->crtc == crtc)
 122                         goto found;
 123
 124         return -EINVAL;
 125 found:
 126         helper = &imx_crtc->imx_drm_helper_funcs;
 127         if (helper->set_interface_pix_fmt)
 128                 return helper->set_interface_pix_fmt(crtc,
 129                                 encoder_type, interface_pix_fmt,
 130                                 hsync_pin, vsync_pin);
 131         return 0;
 132 }
 133 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format_pins);
 134
 135 int imx_drm_crtc_panel_format(struct drm_crtc *crtc, u32 encoder_type,
 136                 u32 interface_pix_fmt)
 137 {
 138         return imx_drm_crtc_panel_format_pins(crtc, encoder_type,
 139                                               interface_pix_fmt, 2, 3);
 140 }
 141 EXPORT_SYMBOL_GPL(imx_drm_crtc_panel_format);
 142
 143 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 144 {
 145         return drm_vblank_get(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 146 }
 147 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 148
 149 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 150 {
 151         drm_vblank_put(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 152 }
 153 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 154
 155 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 156 {
 157         drm_handle_vblank(imx_drm_crtc->imxdrm->drm, imx_drm_crtc->pipe);
 158 }
 159 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 160
 161 static int imx_drm_enable_vblank(struct drm_device *drm, int crtc)
 162 {
 163         struct imx_drm_device *imxdrm = drm->dev_private;
 164         struct imx_drm_crtc *imx_drm_crtc;
 165         int ret;
 166
 167         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 168         if (!imx_drm_crtc)
 169                 return -EINVAL;
 170
 171         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 172                 return -ENOSYS;
 173
 174         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 175                         imx_drm_crtc->crtc);
 176
 177         return ret;
 178 }
 179
 180 static void imx_drm_disable_vblank(struct drm_device *drm, int crtc)
 181 {
 182         struct imx_drm_device *imxdrm = drm->dev_private;
 183         struct imx_drm_crtc *imx_drm_crtc;
 184
 185         imx_drm_crtc = imx_drm_crtc_by_num(imxdrm, crtc);
 186         if (!imx_drm_crtc)
 187                 return;
 188
 189         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 190                 return;
 191
 192         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 193 }
 194
 195 static void imx_drm_driver_preclose(struct drm_device *drm,
 196                 struct drm_file *file)
 197 {
 198         int i;
 199
 200         if (!file->is_master)
 201                 return;
 202
 203         for (i = 0; i < MAX_CRTC; i++)
 204                 imx_drm_disable_vblank(drm, i);
 205 }
 206
 207 static const struct file_operations imx_drm_driver_fops = {
 208         .owner = THIS_MODULE,
 209         .open = drm_open,
 210         .release = drm_release,
 211         .unlocked_ioctl = drm_ioctl,
 212         .mmap = drm_gem_cma_mmap,
 213         .poll = drm_poll,
 214         .read = drm_read,
 215         .llseek = noop_llseek,
 216 };
 217
 218 static struct imx_drm_device *imx_drm_device;
 219
 220 static struct imx_drm_device *__imx_drm_device(void)
 221 {
 222         return imx_drm_device;
 223 }
 224
 225 struct drm_device *imx_drm_device_get(void)
 226 {
 227         struct imx_drm_device *imxdrm = __imx_drm_device();
 228         struct imx_drm_encoder *enc;
 229         struct imx_drm_connector *con;
 230         struct imx_drm_crtc *crtc;
 231
 232         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 233                 if (!try_module_get(enc->owner)) {
 234                         dev_err(imxdrm->dev, "could not get module %s\n",
 235                                         module_name(enc->owner));
 236                         goto unwind_enc;
 237                 }
 238         }
 239
 240         list_for_each_entry(con, &imxdrm->connector_list, list) {
 241                 if (!try_module_get(con->owner)) {
 242                         dev_err(imxdrm->dev, "could not get module %s\n",
 243                                         module_name(con->owner));
 244                         goto unwind_con;
 245                 }
 246         }
 247
 248         list_for_each_entry(crtc, &imxdrm->crtc_list, list) {
 249                 if (!try_module_get(crtc->owner)) {
 250                         dev_err(imxdrm->dev, "could not get module %s\n",
 251                                         module_name(crtc->owner));
 252                         goto unwind_crtc;
 253                 }
 254         }
 255
 256         return imxdrm->drm;
 257
 258 unwind_crtc:
 259         list_for_each_entry_continue_reverse(crtc, &imxdrm->crtc_list, list)
 260                 module_put(crtc->owner);
 261 unwind_con:
 262         list_for_each_entry_continue_reverse(con, &imxdrm->connector_list, list)
 263                 module_put(con->owner);
 264 unwind_enc:
 265         list_for_each_entry_continue_reverse(enc, &imxdrm->encoder_list, list)
 266                 module_put(enc->owner);
 267
 268         mutex_unlock(&imxdrm->mutex);
 269
 270         return NULL;
 271
 272 }
 273 EXPORT_SYMBOL_GPL(imx_drm_device_get);
 274
 275 void imx_drm_device_put(void)
 276 {
 277         struct imx_drm_device *imxdrm = __imx_drm_device();
 278         struct imx_drm_encoder *enc;
 279         struct imx_drm_connector *con;
 280         struct imx_drm_crtc *crtc;
 281
 282         mutex_lock(&imxdrm->mutex);
 283
 284         list_for_each_entry(crtc, &imxdrm->crtc_list, list)
 285                 module_put(crtc->owner);
 286
 287         list_for_each_entry(con, &imxdrm->connector_list, list)
 288                 module_put(con->owner);
 289
 290         list_for_each_entry(enc, &imxdrm->encoder_list, list)
 291                 module_put(enc->owner);
 292
 293         mutex_unlock(&imxdrm->mutex);
 294 }
 295 EXPORT_SYMBOL_GPL(imx_drm_device_put);
 296
 297 static int drm_mode_group_reinit(struct drm_device *dev)
 298 {
 299         struct drm_mode_group *group = &dev->primary->mode_group;
 300         uint32_t *id_list = group->id_list;
 301         int ret;
 302
 303         ret = drm_mode_group_init_legacy_group(dev, group);
 304         if (ret < 0)
 305                 return ret;
 306
 307         kfree(id_list);
 308         return 0;
 309 }
 310
 311 /*
 312  * register an encoder to the drm core
 313  */
 314 static int imx_drm_encoder_register(struct imx_drm_encoder *imx_drm_encoder)
 315 {
 316         struct imx_drm_device *imxdrm = __imx_drm_device();
 317
 318         INIT_LIST_HEAD(&imx_drm_encoder->possible_crtcs);
 319
 320         drm_encoder_init(imxdrm->drm, imx_drm_encoder->encoder,
 321                         imx_drm_encoder->encoder->funcs,
 322                         imx_drm_encoder->encoder->encoder_type);
 323
 324         drm_mode_group_reinit(imxdrm->drm);
 325
 326         return 0;
 327 }
 328
 329 /*
 330  * unregister an encoder from the drm core
 331  */
 332 static void imx_drm_encoder_unregister(struct imx_drm_encoder
 333                 *imx_drm_encoder)
 334 {
 335         struct imx_drm_device *imxdrm = __imx_drm_device();
 336
 337         drm_encoder_cleanup(imx_drm_encoder->encoder);
 338
 339         drm_mode_group_reinit(imxdrm->drm);
 340 }
 341
 342 /*
 343  * register a connector to the drm core
 344  */
 345 static int imx_drm_connector_register(
 346                 struct imx_drm_connector *imx_drm_connector)
 347 {
 348         struct imx_drm_device *imxdrm = __imx_drm_device();
 349
 350         drm_connector_init(imxdrm->drm, imx_drm_connector->connector,
 351                         imx_drm_connector->connector->funcs,
 352                         imx_drm_connector->connector->connector_type);
 353         drm_mode_group_reinit(imxdrm->drm);
 354
 355         return drm_sysfs_connector_add(imx_drm_connector->connector);
 356 }
 357
 358 /*
 359  * unregister a connector from the drm core
 360  */
 361 static void imx_drm_connector_unregister(
 362                 struct imx_drm_connector *imx_drm_connector)
 363 {
 364         struct imx_drm_device *imxdrm = __imx_drm_device();
 365
 366         drm_sysfs_connector_remove(imx_drm_connector->connector);
 367         drm_connector_cleanup(imx_drm_connector->connector);
 368
 369         drm_mode_group_reinit(imxdrm->drm);
 370 }
 371
 372 /*
 373  * register a crtc to the drm core
 374  */
 375 static int imx_drm_crtc_register(struct imx_drm_crtc *imx_drm_crtc)
 376 {
 377         struct imx_drm_device *imxdrm = __imx_drm_device();
 378         int ret;
 379
 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_crtc_init(imxdrm->drm, imx_drm_crtc->crtc,
 388                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 389
 390         drm_mode_group_reinit(imxdrm->drm);
 391
 392         return 0;
 393 }
 394
 395 /*
 396  * Called by the CRTC driver when all CRTCs are registered. This
 397  * puts all the pieces together and initializes the driver.
 398  * Once this is called no more CRTCs can be registered since
 399  * the drm core has hardcoded the number of crtcs in several
 400  * places.
 401  */
 402 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 403 {
 404         struct imx_drm_device *imxdrm = __imx_drm_device();
 405         int ret;
 406
 407         imxdrm->drm = drm;
 408
 409         drm->dev_private = imxdrm;
 410
 411         /*
 412          * enable drm irq mode.
 413          * - with irq_enabled = true, we can use the vblank feature.
 414          *
 415          * P.S. note that we wouldn't use drm irq handler but
 416          *      just specific driver own one instead because
 417          *      drm framework supports only one irq handler and
 418          *      drivers can well take care of their interrupts
 419          */
 420         drm->irq_enabled = true;
 421
 422         drm_mode_config_init(drm);
 423         imx_drm_mode_config_init(drm);
 424
 425         mutex_lock(&imxdrm->mutex);
 426
 427         drm_kms_helper_poll_init(imxdrm->drm);
 428
 429         /* setup the grouping for the legacy output */
 430         ret = drm_mode_group_init_legacy_group(imxdrm->drm,
 431                         &imxdrm->drm->primary->mode_group);
 432         if (ret)
 433                 goto err_kms;
 434
 435         ret = drm_vblank_init(imxdrm->drm, MAX_CRTC);
 436         if (ret)
 437                 goto err_kms;
 438
 439         /*
 440          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 441          * by drm timer once a current process gives up ownership of
 442          * vblank event.(after drm_vblank_put function is called)
 443          */
 444         imxdrm->drm->vblank_disable_allowed = true;
 445
 446         if (!imx_drm_device_get()) {
 447                 ret = -EINVAL;
 448                 goto err_vblank;
 449         }
 450
 451         mutex_unlock(&imxdrm->mutex);
 452         return 0;
 453
 454 err_vblank:
 455         drm_vblank_cleanup(drm);
 456 err_kms:
 457         drm_kms_helper_poll_fini(drm);
 458         drm_mode_config_cleanup(drm);
 459         mutex_unlock(&imxdrm->mutex);
 460
 461         return ret;
 462 }
 463
 464 static void imx_drm_update_possible_crtcs(void)
 465 {
 466         struct imx_drm_device *imxdrm = __imx_drm_device();
 467         struct imx_drm_crtc *imx_drm_crtc;
 468         struct imx_drm_encoder *enc;
 469         struct crtc_cookie *cookie;
 470
 471         list_for_each_entry(enc, &imxdrm->encoder_list, list) {
 472                 u32 possible_crtcs = 0;
 473
 474                 list_for_each_entry(cookie, &enc->possible_crtcs, list) {
 475                         list_for_each_entry(imx_drm_crtc, &imxdrm->crtc_list, list) {
 476                                 if (imx_drm_crtc->cookie.cookie == cookie->cookie &&
 477                                                 imx_drm_crtc->cookie.id == cookie->id) {
 478                                         possible_crtcs |= 1 << imx_drm_crtc->pipe;
 479                                 }
 480                         }
 481                 }
 482                 enc->encoder->possible_crtcs = possible_crtcs;
 483                 enc->encoder->possible_clones = possible_crtcs;
 484         }
 485 }
 486
 487 /*
 488  * imx_drm_add_crtc - add a new crtc
 489  *
 490  * The return value if !NULL is a cookie for the caller to pass to
 491  * imx_drm_remove_crtc later.
 492  */
 493 int imx_drm_add_crtc(struct drm_crtc *crtc,
 494                 struct imx_drm_crtc **new_crtc,
 495                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 496                 struct module *owner, void *cookie, int id)
 497 {
 498         struct imx_drm_device *imxdrm = __imx_drm_device();
 499         struct imx_drm_crtc *imx_drm_crtc;
 500         int ret;
 501
 502         mutex_lock(&imxdrm->mutex);
 503
 504         /*
 505          * The vblank arrays are dimensioned by MAX_CRTC - we can't
 506          * pass IDs greater than this to those functions.
 507          */
 508         if (imxdrm->pipes >= MAX_CRTC) {
 509                 ret = -EINVAL;
 510                 goto err_busy;
 511         }
 512
 513         if (imxdrm->drm->open_count) {
 514                 ret = -EBUSY;
 515                 goto err_busy;
 516         }
 517
 518         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 519         if (!imx_drm_crtc) {
 520                 ret = -ENOMEM;
 521                 goto err_alloc;
 522         }
 523
 524         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 525         imx_drm_crtc->pipe = imxdrm->pipes++;
 526         imx_drm_crtc->cookie.cookie = cookie;
 527         imx_drm_crtc->cookie.id = id;
 528
 529         imx_drm_crtc->crtc = crtc;
 530         imx_drm_crtc->imxdrm = imxdrm;
 531
 532         imx_drm_crtc->owner = owner;
 533
 534         list_add_tail(&imx_drm_crtc->list, &imxdrm->crtc_list);
 535
 536         *new_crtc = imx_drm_crtc;
 537
 538         ret = imx_drm_crtc_register(imx_drm_crtc);
 539         if (ret)
 540                 goto err_register;
 541
 542         imx_drm_update_possible_crtcs();
 543
 544         mutex_unlock(&imxdrm->mutex);
 545
 546         return 0;
 547
 548 err_register:
 549         list_del(&imx_drm_crtc->list);
 550         kfree(imx_drm_crtc);
 551 err_alloc:
 552 err_busy:
 553         mutex_unlock(&imxdrm->mutex);
 554         return ret;
 555 }
 556 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 557
 558 /*
 559  * imx_drm_remove_crtc - remove a crtc
 560  */
 561 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 562 {
 563         struct imx_drm_device *imxdrm = imx_drm_crtc->imxdrm;
 564
 565         mutex_lock(&imxdrm->mutex);
 566
 567         drm_crtc_cleanup(imx_drm_crtc->crtc);
 568
 569         list_del(&imx_drm_crtc->list);
 570
 571         drm_mode_group_reinit(imxdrm->drm);
 572
 573         mutex_unlock(&imxdrm->mutex);
 574
 575         kfree(imx_drm_crtc);
 576
 577         return 0;
 578 }
 579 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 580
 581 /*
 582  * imx_drm_add_encoder - add a new encoder
 583  */
 584 int imx_drm_add_encoder(struct drm_encoder *encoder,
 585                 struct imx_drm_encoder **newenc, struct module *owner)
 586 {
 587         struct imx_drm_device *imxdrm = __imx_drm_device();
 588         struct imx_drm_encoder *imx_drm_encoder;
 589         int ret;
 590
 591         mutex_lock(&imxdrm->mutex);
 592
 593         if (imxdrm->drm->open_count) {
 594                 ret = -EBUSY;
 595                 goto err_busy;
 596         }
 597
 598         imx_drm_encoder = kzalloc(sizeof(*imx_drm_encoder), GFP_KERNEL);
 599         if (!imx_drm_encoder) {
 600                 ret = -ENOMEM;
 601                 goto err_alloc;
 602         }
 603
 604         imx_drm_encoder->encoder = encoder;
 605         imx_drm_encoder->owner = owner;
 606
 607         ret = imx_drm_encoder_register(imx_drm_encoder);
 608         if (ret) {
 609                 ret = -ENOMEM;
 610                 goto err_register;
 611         }
 612
 613         list_add_tail(&imx_drm_encoder->list, &imxdrm->encoder_list);
 614
 615         *newenc = imx_drm_encoder;
 616
 617         mutex_unlock(&imxdrm->mutex);
 618
 619         return 0;
 620
 621 err_register:
 622         kfree(imx_drm_encoder);
 623 err_alloc:
 624 err_busy:
 625         mutex_unlock(&imxdrm->mutex);
 626
 627         return ret;
 628 }
 629 EXPORT_SYMBOL_GPL(imx_drm_add_encoder);
 630
 631 int imx_drm_encoder_add_possible_crtcs(
 632                 struct imx_drm_encoder *imx_drm_encoder,
 633                 struct device_node *np)
 634 {
 635         struct imx_drm_device *imxdrm = __imx_drm_device();
 636         struct of_phandle_args args;
 637         struct crtc_cookie *c;
 638         int ret = 0;
 639         int i;
 640
 641         if (!list_empty(&imx_drm_encoder->possible_crtcs))
 642                 return -EBUSY;
 643
 644         for (i = 0; !ret; i++) {
 645                 ret = of_parse_phandle_with_args(np, "crtcs",
 646                                 "#crtc-cells", i, &args);
 647                 if (ret < 0)
 648                         break;
 649
 650                 c = kzalloc(sizeof(*c), GFP_KERNEL);
 651                 if (!c) {
 652                         of_node_put(args.np);
 653                         return -ENOMEM;
 654                 }
 655
 656                 c->cookie = args.np;
 657                 c->id = args.args_count > 0 ? args.args[0] : 0;
 658
 659                 of_node_put(args.np);
 660
 661                 mutex_lock(&imxdrm->mutex);
 662
 663                 list_add_tail(&c->list, &imx_drm_encoder->possible_crtcs);
 664
 665                 mutex_unlock(&imxdrm->mutex);
 666         }
 667
 668         imx_drm_update_possible_crtcs();
 669
 670         return 0;
 671 }
 672 EXPORT_SYMBOL_GPL(imx_drm_encoder_add_possible_crtcs);
 673
 674 int imx_drm_encoder_get_mux_id(struct imx_drm_encoder *imx_drm_encoder,
 675                 struct drm_crtc *crtc)
 676 {
 677         struct imx_drm_device *imxdrm = __imx_drm_device();
 678         struct imx_drm_crtc *imx_crtc;
 679         int i = 0;
 680
 681         list_for_each_entry(imx_crtc, &imxdrm->crtc_list, list) {
 682                 if (imx_crtc->crtc == crtc)
 683                         goto found;
 684                 i++;
 685         }
 686
 687         return -EINVAL;
 688 found:
 689         return i;
 690 }
 691 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 692
 693 /*
 694  * imx_drm_remove_encoder - remove an encoder
 695  */
 696 int imx_drm_remove_encoder(struct imx_drm_encoder *imx_drm_encoder)
 697 {
 698         struct imx_drm_device *imxdrm = __imx_drm_device();
 699         struct crtc_cookie *c, *tmp;
 700
 701         mutex_lock(&imxdrm->mutex);
 702
 703         imx_drm_encoder_unregister(imx_drm_encoder);
 704
 705         list_del(&imx_drm_encoder->list);
 706
 707         list_for_each_entry_safe(c, tmp, &imx_drm_encoder->possible_crtcs,
 708                         list)
 709                 kfree(c);
 710
 711         mutex_unlock(&imxdrm->mutex);
 712
 713         kfree(imx_drm_encoder);
 714
 715         return 0;
 716 }
 717 EXPORT_SYMBOL_GPL(imx_drm_remove_encoder);
 718
 719 /*
 720  * imx_drm_add_connector - add a connector
 721  */
 722 int imx_drm_add_connector(struct drm_connector *connector,
 723                 struct imx_drm_connector **new_con,
 724                 struct module *owner)
 725 {
 726         struct imx_drm_device *imxdrm = __imx_drm_device();
 727         struct imx_drm_connector *imx_drm_connector;
 728         int ret;
 729
 730         mutex_lock(&imxdrm->mutex);
 731
 732         if (imxdrm->drm->open_count) {
 733                 ret = -EBUSY;
 734                 goto err_busy;
 735         }
 736
 737         imx_drm_connector = kzalloc(sizeof(*imx_drm_connector), GFP_KERNEL);
 738         if (!imx_drm_connector) {
 739                 ret = -ENOMEM;
 740                 goto err_alloc;
 741         }
 742
 743         imx_drm_connector->connector = connector;
 744         imx_drm_connector->owner = owner;
 745
 746         ret = imx_drm_connector_register(imx_drm_connector);
 747         if (ret)
 748                 goto err_register;
 749
 750         list_add_tail(&imx_drm_connector->list, &imxdrm->connector_list);
 751
 752         *new_con = imx_drm_connector;
 753
 754         mutex_unlock(&imxdrm->mutex);
 755
 756         return 0;
 757
 758 err_register:
 759         kfree(imx_drm_connector);
 760 err_alloc:
 761 err_busy:
 762         mutex_unlock(&imxdrm->mutex);
 763
 764         return ret;
 765 }
 766 EXPORT_SYMBOL_GPL(imx_drm_add_connector);
 767
 768 void imx_drm_fb_helper_set(struct drm_fbdev_cma *fbdev_helper)
 769 {
 770         struct imx_drm_device *imxdrm = __imx_drm_device();
 771
 772         imxdrm->fbhelper = fbdev_helper;
 773 }
 774 EXPORT_SYMBOL_GPL(imx_drm_fb_helper_set);
 775
 776 /*
 777  * imx_drm_remove_connector - remove a connector
 778  */
 779 int imx_drm_remove_connector(struct imx_drm_connector *imx_drm_connector)
 780 {
 781         struct imx_drm_device *imxdrm = __imx_drm_device();
 782
 783         mutex_lock(&imxdrm->mutex);
 784
 785         imx_drm_connector_unregister(imx_drm_connector);
 786
 787         list_del(&imx_drm_connector->list);
 788
 789         mutex_unlock(&imxdrm->mutex);
 790
 791         kfree(imx_drm_connector);
 792
 793         return 0;
 794 }
 795 EXPORT_SYMBOL_GPL(imx_drm_remove_connector);
 796
 797 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 798         /* none so far */
 799 };
 800
 801 static struct drm_driver imx_drm_driver = {
 802         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 803         .load                   = imx_drm_driver_load,
 804         .unload                 = imx_drm_driver_unload,
 805         .lastclose              = imx_drm_driver_lastclose,
 806         .preclose               = imx_drm_driver_preclose,
 807         .gem_free_object        = drm_gem_cma_free_object,
 808         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 809         .dumb_create            = drm_gem_cma_dumb_create,
 810         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 811         .dumb_destroy           = drm_gem_dumb_destroy,
 812
 813         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 814         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 815         .gem_prime_import       = drm_gem_prime_import,
 816         .gem_prime_export       = drm_gem_prime_export,
 817         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 818         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 819         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 820         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 821         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 822         .get_vblank_counter     = drm_vblank_count,
 823         .enable_vblank          = imx_drm_enable_vblank,
 824         .disable_vblank         = imx_drm_disable_vblank,
 825         .ioctls                 = imx_drm_ioctls,
 826         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 827         .fops                   = &imx_drm_driver_fops,
 828         .name                   = "imx-drm",
 829         .desc                   = "i.MX DRM graphics",
 830         .date                   = "20120507",
 831         .major                  = 1,
 832         .minor                  = 0,
 833         .patchlevel             = 0,
 834 };
 835
 836 static int imx_drm_platform_probe(struct platform_device *pdev)
 837 {
 838         int ret;
 839
 840         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 841         if (ret)
 842                 return ret;
 843
 844         imx_drm_device->dev = &pdev->dev;
 845
 846         return drm_platform_init(&imx_drm_driver, pdev);
 847 }
 848
 849 static int imx_drm_platform_remove(struct platform_device *pdev)
 850 {
 851         drm_platform_exit(&imx_drm_driver, pdev);
 852
 853         return 0;
 854 }
 855
 856 static struct platform_driver imx_drm_pdrv = {
 857         .probe          = imx_drm_platform_probe,
 858         .remove         = imx_drm_platform_remove,
 859         .driver         = {
 860                 .owner  = THIS_MODULE,
 861                 .name   = "imx-drm",
 862         },
 863 };
 864
 865 static struct platform_device *imx_drm_pdev;
 866
 867 static int __init imx_drm_init(void)
 868 {
 869         int ret;
 870
 871         imx_drm_device = kzalloc(sizeof(*imx_drm_device), GFP_KERNEL);
 872         if (!imx_drm_device)
 873                 return -ENOMEM;
 874
 875         mutex_init(&imx_drm_device->mutex);
 876         INIT_LIST_HEAD(&imx_drm_device->crtc_list);
 877         INIT_LIST_HEAD(&imx_drm_device->connector_list);
 878         INIT_LIST_HEAD(&imx_drm_device->encoder_list);
 879
 880         imx_drm_pdev = platform_device_register_simple("imx-drm", -1, NULL, 0);
 881         if (IS_ERR(imx_drm_pdev)) {
 882                 ret = PTR_ERR(imx_drm_pdev);
 883                 goto err_pdev;
 884         }
 885
 886         ret = platform_driver_register(&imx_drm_pdrv);
 887         if (ret)
 888                 goto err_pdrv;
 889
 890         return 0;
 891
 892 err_pdrv:
 893         platform_device_unregister(imx_drm_pdev);
 894 err_pdev:
 895         kfree(imx_drm_device);
 896
 897         return ret;
 898 }
 899
 900 static void __exit imx_drm_exit(void)
 901 {
 902         platform_device_unregister(imx_drm_pdev);
 903         platform_driver_unregister(&imx_drm_pdrv);
 904
 905         kfree(imx_drm_device);
 906 }
 907
 908 module_init(imx_drm_init);
 909 module_exit(imx_drm_exit);
 910
 911 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 912 MODULE_DESCRIPTION("i.MX drm driver core");
 913 MODULE_LICENSE("GPL");