drivers/gpu/drm/imx/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/fb.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <drm/drmP.h>
  22 #include <drm/drm_fb_helper.h>
  23 #include <drm/drm_crtc_helper.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25 #include <drm/drm_fb_cma_helper.h>
  26 #include <drm/drm_plane_helper.h>
  27 #include <drm/drm_of.h>
  28
  29 #include "imx-drm.h"
  30
  31 #define MAX_CRTC        4
  32
  33 struct imx_drm_component {
  34         struct device_node *of_node;
  35         struct list_head list;
  36 };
  37
  38 struct imx_drm_device {
  39         struct drm_device                       *drm;
  40         struct imx_drm_crtc                     *crtc[MAX_CRTC];
  41         unsigned int                            pipes;
  42         struct drm_fbdev_cma                    *fbhelper;
  43 };
  44
  45 struct imx_drm_crtc {
  46         struct drm_crtc                         *crtc;
  47         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
  48 };
  49
  50 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
  51 static int legacyfb_depth = 16;
  52 module_param(legacyfb_depth, int, 0444);
  53 #endif
  54
  55 unsigned int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
  56 {
  57         return drm_crtc_index(crtc->crtc);
  58 }
  59 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
  60
  61 static void imx_drm_driver_lastclose(struct drm_device *drm)
  62 {
  63         struct imx_drm_device *imxdrm = drm->dev_private;
  64
  65         drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  66 }
  67
  68 static int imx_drm_driver_unload(struct drm_device *drm)
  69 {
  70         struct imx_drm_device *imxdrm = drm->dev_private;
  71
  72         drm_kms_helper_poll_fini(drm);
  73
  74         if (imxdrm->fbhelper)
  75                 drm_fbdev_cma_fini(imxdrm->fbhelper);
  76
  77         component_unbind_all(drm->dev, drm);
  78
  79         drm_vblank_cleanup(drm);
  80         drm_mode_config_cleanup(drm);
  81
  82         platform_set_drvdata(drm->platformdev, NULL);
  83
  84         return 0;
  85 }
  86
  87 static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
  88 {
  89         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
  90         unsigned i;
  91
  92         for (i = 0; i < MAX_CRTC; i++)
  93                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
  94                         return imxdrm->crtc[i];
  95
  96         return NULL;
  97 }
  98
  99 int imx_drm_set_bus_format_pins(struct drm_encoder *encoder, u32 bus_format,
 100                 int hsync_pin, int vsync_pin)
 101 {
 102         struct imx_drm_crtc_helper_funcs *helper;
 103         struct imx_drm_crtc *imx_crtc;
 104
 105         imx_crtc = imx_drm_find_crtc(encoder->crtc);
 106         if (!imx_crtc)
 107                 return -EINVAL;
 108
 109         helper = &imx_crtc->imx_drm_helper_funcs;
 110         if (helper->set_interface_pix_fmt)
 111                 return helper->set_interface_pix_fmt(encoder->crtc,
 112                                         bus_format, hsync_pin, vsync_pin);
 113         return 0;
 114 }
 115 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format_pins);
 116
 117 int imx_drm_set_bus_format(struct drm_encoder *encoder, u32 bus_format)
 118 {
 119         return imx_drm_set_bus_format_pins(encoder, bus_format, 2, 3);
 120 }
 121 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format);
 122
 123 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 124 {
 125         return drm_crtc_vblank_get(imx_drm_crtc->crtc);
 126 }
 127 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 128
 129 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 130 {
 131         drm_crtc_vblank_put(imx_drm_crtc->crtc);
 132 }
 133 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 134
 135 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 136 {
 137         drm_crtc_handle_vblank(imx_drm_crtc->crtc);
 138 }
 139 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 140
 141 static int imx_drm_enable_vblank(struct drm_device *drm, unsigned int pipe)
 142 {
 143         struct imx_drm_device *imxdrm = drm->dev_private;
 144         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
 145         int ret;
 146
 147         if (!imx_drm_crtc)
 148                 return -EINVAL;
 149
 150         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 151                 return -ENOSYS;
 152
 153         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 154                         imx_drm_crtc->crtc);
 155
 156         return ret;
 157 }
 158
 159 static void imx_drm_disable_vblank(struct drm_device *drm, unsigned int pipe)
 160 {
 161         struct imx_drm_device *imxdrm = drm->dev_private;
 162         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
 163
 164         if (!imx_drm_crtc)
 165                 return;
 166
 167         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 168                 return;
 169
 170         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 171 }
 172
 173 static const struct file_operations imx_drm_driver_fops = {
 174         .owner = THIS_MODULE,
 175         .open = drm_open,
 176         .release = drm_release,
 177         .unlocked_ioctl = drm_ioctl,
 178         .mmap = drm_gem_cma_mmap,
 179         .poll = drm_poll,
 180         .read = drm_read,
 181         .llseek = noop_llseek,
 182 };
 183
 184 void imx_drm_connector_destroy(struct drm_connector *connector)
 185 {
 186         drm_connector_unregister(connector);
 187         drm_connector_cleanup(connector);
 188 }
 189 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
 190
 191 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
 192 {
 193         drm_encoder_cleanup(encoder);
 194 }
 195 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
 196
 197 static void imx_drm_output_poll_changed(struct drm_device *drm)
 198 {
 199         struct imx_drm_device *imxdrm = drm->dev_private;
 200
 201         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
 202 }
 203
 204 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 205         .fb_create = drm_fb_cma_create,
 206         .output_poll_changed = imx_drm_output_poll_changed,
 207 };
 208
 209 /*
 210  * Main DRM initialisation. This binds, initialises and registers
 211  * with DRM the subcomponents of the driver.
 212  */
 213 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 214 {
 215         struct imx_drm_device *imxdrm;
 216         struct drm_connector *connector;
 217         int ret;
 218
 219         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
 220         if (!imxdrm)
 221                 return -ENOMEM;
 222
 223         imxdrm->drm = drm;
 224
 225         drm->dev_private = imxdrm;
 226
 227         /*
 228          * enable drm irq mode.
 229          * - with irq_enabled = true, we can use the vblank feature.
 230          *
 231          * P.S. note that we wouldn't use drm irq handler but
 232          *      just specific driver own one instead because
 233          *      drm framework supports only one irq handler and
 234          *      drivers can well take care of their interrupts
 235          */
 236         drm->irq_enabled = true;
 237
 238         /*
 239          * set max width and height as default value(4096x4096).
 240          * this value would be used to check framebuffer size limitation
 241          * at drm_mode_addfb().
 242          */
 243         drm->mode_config.min_width = 64;
 244         drm->mode_config.min_height = 64;
 245         drm->mode_config.max_width = 4096;
 246         drm->mode_config.max_height = 4096;
 247         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 248
 249         drm_mode_config_init(drm);
 250
 251         ret = drm_vblank_init(drm, MAX_CRTC);
 252         if (ret)
 253                 goto err_kms;
 254
 255         /*
 256          * with vblank_disable_allowed = true, vblank interrupt will be
 257          * disabled by drm timer once a current process gives up ownership
 258          * of vblank event. (after drm_vblank_put function is called)
 259          */
 260         drm->vblank_disable_allowed = true;
 261
 262         platform_set_drvdata(drm->platformdev, drm);
 263
 264         /* Now try and bind all our sub-components */
 265         ret = component_bind_all(drm->dev, drm);
 266         if (ret)
 267                 goto err_vblank;
 268
 269         /*
 270          * All components are now added, we can publish the connector sysfs
 271          * entries to userspace.  This will generate hotplug events and so
 272          * userspace will expect to be able to access DRM at this point.
 273          */
 274         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 275                 ret = drm_connector_register(connector);
 276                 if (ret) {
 277                         dev_err(drm->dev,
 278                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 279                                 connector->base.id,
 280                                 connector->name, ret);
 281                         goto err_unbind;
 282                 }
 283         }
 284
 285         /*
 286          * All components are now initialised, so setup the fb helper.
 287          * The fb helper takes copies of key hardware information, so the
 288          * crtcs/connectors/encoders must not change after this point.
 289          */
 290 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 291         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 292                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 293                 legacyfb_depth = 16;
 294         }
 295         drm_helper_disable_unused_functions(drm);
 296         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
 297                                 drm->mode_config.num_crtc, MAX_CRTC);
 298         if (IS_ERR(imxdrm->fbhelper)) {
 299                 ret = PTR_ERR(imxdrm->fbhelper);
 300                 imxdrm->fbhelper = NULL;
 301                 goto err_unbind;
 302         }
 303 #endif
 304
 305         drm_kms_helper_poll_init(drm);
 306
 307         return 0;
 308
 309 err_unbind:
 310         component_unbind_all(drm->dev, drm);
 311 err_vblank:
 312         drm_vblank_cleanup(drm);
 313 err_kms:
 314         drm_mode_config_cleanup(drm);
 315
 316         return ret;
 317 }
 318
 319 /*
 320  * imx_drm_add_crtc - add a new crtc
 321  */
 322 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
 323                 struct imx_drm_crtc **new_crtc, struct drm_plane *primary_plane,
 324                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 325                 struct device_node *port)
 326 {
 327         struct imx_drm_device *imxdrm = drm->dev_private;
 328         struct imx_drm_crtc *imx_drm_crtc;
 329
 330         /*
 331          * The vblank arrays are dimensioned by MAX_CRTC - we can't
 332          * pass IDs greater than this to those functions.
 333          */
 334         if (imxdrm->pipes >= MAX_CRTC)
 335                 return -EINVAL;
 336
 337         if (imxdrm->drm->open_count)
 338                 return -EBUSY;
 339
 340         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 341         if (!imx_drm_crtc)
 342                 return -ENOMEM;
 343
 344         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 345         imx_drm_crtc->crtc = crtc;
 346
 347         crtc->port = port;
 348
 349         imxdrm->crtc[imxdrm->pipes++] = imx_drm_crtc;
 350
 351         *new_crtc = imx_drm_crtc;
 352
 353         drm_crtc_helper_add(crtc,
 354                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 355
 356         drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
 357                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs, NULL);
 358
 359         return 0;
 360 }
 361 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 362
 363 /*
 364  * imx_drm_remove_crtc - remove a crtc
 365  */
 366 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 367 {
 368         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
 369         unsigned int pipe = drm_crtc_index(imx_drm_crtc->crtc);
 370
 371         drm_crtc_cleanup(imx_drm_crtc->crtc);
 372
 373         imxdrm->crtc[pipe] = NULL;
 374
 375         kfree(imx_drm_crtc);
 376
 377         return 0;
 378 }
 379 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 380
 381 int imx_drm_encoder_parse_of(struct drm_device *drm,
 382         struct drm_encoder *encoder, struct device_node *np)
 383 {
 384         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 385
 386         /*
 387          * If we failed to find the CRTC(s) which this encoder is
 388          * supposed to be connected to, it's because the CRTC has
 389          * not been registered yet.  Defer probing, and hope that
 390          * the required CRTC is added later.
 391          */
 392         if (crtc_mask == 0)
 393                 return -EPROBE_DEFER;
 394
 395         encoder->possible_crtcs = crtc_mask;
 396
 397         /* FIXME: this is the mask of outputs which can clone this output. */
 398         encoder->possible_clones = ~0;
 399
 400         return 0;
 401 }
 402 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 403
 404 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 405         /* none so far */
 406 };
 407
 408 static struct drm_driver imx_drm_driver = {
 409         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 410         .load                   = imx_drm_driver_load,
 411         .unload                 = imx_drm_driver_unload,
 412         .lastclose              = imx_drm_driver_lastclose,
 413         .set_busid              = drm_platform_set_busid,
 414         .gem_free_object        = drm_gem_cma_free_object,
 415         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 416         .dumb_create            = drm_gem_cma_dumb_create,
 417         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 418         .dumb_destroy           = drm_gem_dumb_destroy,
 419
 420         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 421         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 422         .gem_prime_import       = drm_gem_prime_import,
 423         .gem_prime_export       = drm_gem_prime_export,
 424         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 425         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 426         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 427         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 428         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 429         .get_vblank_counter     = drm_vblank_no_hw_counter,
 430         .enable_vblank          = imx_drm_enable_vblank,
 431         .disable_vblank         = imx_drm_disable_vblank,
 432         .ioctls                 = imx_drm_ioctls,
 433         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 434         .fops                   = &imx_drm_driver_fops,
 435         .name                   = "imx-drm",
 436         .desc                   = "i.MX DRM graphics",
 437         .date                   = "20120507",
 438         .major                  = 1,
 439         .minor                  = 0,
 440         .patchlevel             = 0,
 441 };
 442
 443 static int compare_of(struct device *dev, void *data)
 444 {
 445         struct device_node *np = data;
 446
 447         /* Special case for LDB, one device for two channels */
 448         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 449                 np = of_get_parent(np);
 450                 of_node_put(np);
 451         }
 452
 453         return dev->of_node == np;
 454 }
 455
 456 static int imx_drm_bind(struct device *dev)
 457 {
 458         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
 459 }
 460
 461 static void imx_drm_unbind(struct device *dev)
 462 {
 463         drm_put_dev(dev_get_drvdata(dev));
 464 }
 465
 466 static const struct component_master_ops imx_drm_ops = {
 467         .bind = imx_drm_bind,
 468         .unbind = imx_drm_unbind,
 469 };
 470
 471 static int imx_drm_platform_probe(struct platform_device *pdev)
 472 {
 473         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 474
 475         if (!ret)
 476                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 477
 478         return ret;
 479 }
 480
 481 static int imx_drm_platform_remove(struct platform_device *pdev)
 482 {
 483         component_master_del(&pdev->dev, &imx_drm_ops);
 484         return 0;
 485 }
 486
 487 #ifdef CONFIG_PM_SLEEP
 488 static int imx_drm_suspend(struct device *dev)
 489 {
 490         struct drm_device *drm_dev = dev_get_drvdata(dev);
 491
 492         /* The drm_dev is NULL before .load hook is called */
 493         if (drm_dev == NULL)
 494                 return 0;
 495
 496         drm_kms_helper_poll_disable(drm_dev);
 497
 498         return 0;
 499 }
 500
 501 static int imx_drm_resume(struct device *dev)
 502 {
 503         struct drm_device *drm_dev = dev_get_drvdata(dev);
 504
 505         if (drm_dev == NULL)
 506                 return 0;
 507
 508         drm_helper_resume_force_mode(drm_dev);
 509         drm_kms_helper_poll_enable(drm_dev);
 510
 511         return 0;
 512 }
 513 #endif
 514
 515 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 516
 517 static const struct of_device_id imx_drm_dt_ids[] = {
 518         { .compatible = "fsl,imx-display-subsystem", },
 519         { /* sentinel */ },
 520 };
 521 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 522
 523 static struct platform_driver imx_drm_pdrv = {
 524         .probe          = imx_drm_platform_probe,
 525         .remove         = imx_drm_platform_remove,
 526         .driver         = {
 527                 .name   = "imx-drm",
 528                 .pm     = &imx_drm_pm_ops,
 529                 .of_match_table = imx_drm_dt_ids,
 530         },
 531 };
 532 module_platform_driver(imx_drm_pdrv);
 533
 534 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 535 MODULE_DESCRIPTION("i.MX drm driver core");
 536 MODULE_LICENSE("GPL");