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/of_graph.h>
  21 #include <linux/platform_device.h>
  22 #include <drm/drmP.h>
  23 #include <drm/drm_fb_helper.h>
  24 #include <drm/drm_crtc_helper.h>
  25 #include <drm/drm_gem_cma_helper.h>
  26 #include <drm/drm_fb_cma_helper.h>
  27 #include <drm/drm_plane_helper.h>
  28 #include <drm/drm_of.h>
  29
  30 #include "imx-drm.h"
  31
  32 #define MAX_CRTC        4
  33
  34 struct imx_drm_component {
  35         struct device_node *of_node;
  36         struct list_head list;
  37 };
  38
  39 struct imx_drm_device {
  40         struct drm_device                       *drm;
  41         struct imx_drm_crtc                     *crtc[MAX_CRTC];
  42         int                                     pipes;
  43         struct drm_fbdev_cma                    *fbhelper;
  44 };
  45
  46 struct imx_drm_crtc {
  47         struct drm_crtc                         *crtc;
  48         int                                     pipe;
  49         struct imx_drm_crtc_helper_funcs        imx_drm_helper_funcs;
  50 };
  51
  52 static int legacyfb_depth = 16;
  53 module_param(legacyfb_depth, int, 0444);
  54
  55 int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
  56 {
  57         return crtc->pipe;
  58 }
  59 EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
  60
  61 static void imx_drm_driver_lastclose(struct drm_device *drm)
  62 {
  63 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
  64         struct imx_drm_device *imxdrm = drm->dev_private;
  65
  66         drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  67 #endif
  68 }
  69
  70 static int imx_drm_driver_unload(struct drm_device *drm)
  71 {
  72 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
  73         struct imx_drm_device *imxdrm = drm->dev_private;
  74 #endif
  75
  76         drm_kms_helper_poll_fini(drm);
  77
  78 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
  79         if (imxdrm->fbhelper)
  80                 drm_fbdev_cma_fini(imxdrm->fbhelper);
  81 #endif
  82
  83         component_unbind_all(drm->dev, drm);
  84
  85         drm_vblank_cleanup(drm);
  86         drm_mode_config_cleanup(drm);
  87
  88         platform_set_drvdata(drm->platformdev, NULL);
  89
  90         return 0;
  91 }
  92
  93 static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
  94 {
  95         struct imx_drm_device *imxdrm = crtc->dev->dev_private;
  96         unsigned i;
  97
  98         for (i = 0; i < MAX_CRTC; i++)
  99                 if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
 100                         return imxdrm->crtc[i];
 101
 102         return NULL;
 103 }
 104
 105 int imx_drm_set_bus_format_pins(struct drm_encoder *encoder, u32 bus_format,
 106                 int hsync_pin, int vsync_pin)
 107 {
 108         struct imx_drm_crtc_helper_funcs *helper;
 109         struct imx_drm_crtc *imx_crtc;
 110
 111         imx_crtc = imx_drm_find_crtc(encoder->crtc);
 112         if (!imx_crtc)
 113                 return -EINVAL;
 114
 115         helper = &imx_crtc->imx_drm_helper_funcs;
 116         if (helper->set_interface_pix_fmt)
 117                 return helper->set_interface_pix_fmt(encoder->crtc,
 118                                         bus_format, hsync_pin, vsync_pin);
 119         return 0;
 120 }
 121 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format_pins);
 122
 123 int imx_drm_set_bus_format(struct drm_encoder *encoder, u32 bus_format)
 124 {
 125         return imx_drm_set_bus_format_pins(encoder, bus_format, 2, 3);
 126 }
 127 EXPORT_SYMBOL_GPL(imx_drm_set_bus_format);
 128
 129 int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
 130 {
 131         return drm_vblank_get(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
 132 }
 133 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
 134
 135 void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
 136 {
 137         drm_vblank_put(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
 138 }
 139 EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
 140
 141 void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
 142 {
 143         drm_handle_vblank(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
 144 }
 145 EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
 146
 147 static int imx_drm_enable_vblank(struct drm_device *drm, unsigned int pipe)
 148 {
 149         struct imx_drm_device *imxdrm = drm->dev_private;
 150         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
 151         int ret;
 152
 153         if (!imx_drm_crtc)
 154                 return -EINVAL;
 155
 156         if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
 157                 return -ENOSYS;
 158
 159         ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
 160                         imx_drm_crtc->crtc);
 161
 162         return ret;
 163 }
 164
 165 static void imx_drm_disable_vblank(struct drm_device *drm, unsigned int pipe)
 166 {
 167         struct imx_drm_device *imxdrm = drm->dev_private;
 168         struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
 169
 170         if (!imx_drm_crtc)
 171                 return;
 172
 173         if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
 174                 return;
 175
 176         imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
 177 }
 178
 179 static void imx_drm_driver_preclose(struct drm_device *drm,
 180                 struct drm_file *file)
 181 {
 182         int i;
 183
 184         if (!file->is_master)
 185                 return;
 186
 187         for (i = 0; i < MAX_CRTC; i++)
 188                 imx_drm_disable_vblank(drm, i);
 189 }
 190
 191 static const struct file_operations imx_drm_driver_fops = {
 192         .owner = THIS_MODULE,
 193         .open = drm_open,
 194         .release = drm_release,
 195         .unlocked_ioctl = drm_ioctl,
 196         .mmap = drm_gem_cma_mmap,
 197         .poll = drm_poll,
 198         .read = drm_read,
 199         .llseek = noop_llseek,
 200 };
 201
 202 void imx_drm_connector_destroy(struct drm_connector *connector)
 203 {
 204         drm_connector_unregister(connector);
 205         drm_connector_cleanup(connector);
 206 }
 207 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
 208
 209 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
 210 {
 211         drm_encoder_cleanup(encoder);
 212 }
 213 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
 214
 215 static void imx_drm_output_poll_changed(struct drm_device *drm)
 216 {
 217 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 218         struct imx_drm_device *imxdrm = drm->dev_private;
 219
 220         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
 221 #endif
 222 }
 223
 224 static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 225         .fb_create = drm_fb_cma_create,
 226         .output_poll_changed = imx_drm_output_poll_changed,
 227 };
 228
 229 /*
 230  * Main DRM initialisation. This binds, initialises and registers
 231  * with DRM the subcomponents of the driver.
 232  */
 233 static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
 234 {
 235         struct imx_drm_device *imxdrm;
 236         struct drm_connector *connector;
 237         int ret;
 238
 239         imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
 240         if (!imxdrm)
 241                 return -ENOMEM;
 242
 243         imxdrm->drm = drm;
 244
 245         drm->dev_private = imxdrm;
 246
 247         /*
 248          * enable drm irq mode.
 249          * - with irq_enabled = true, we can use the vblank feature.
 250          *
 251          * P.S. note that we wouldn't use drm irq handler but
 252          *      just specific driver own one instead because
 253          *      drm framework supports only one irq handler and
 254          *      drivers can well take care of their interrupts
 255          */
 256         drm->irq_enabled = true;
 257
 258         /*
 259          * set max width and height as default value(4096x4096).
 260          * this value would be used to check framebuffer size limitation
 261          * at drm_mode_addfb().
 262          */
 263         drm->mode_config.min_width = 64;
 264         drm->mode_config.min_height = 64;
 265         drm->mode_config.max_width = 4096;
 266         drm->mode_config.max_height = 4096;
 267         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 268
 269         drm_mode_config_init(drm);
 270
 271         ret = drm_vblank_init(drm, MAX_CRTC);
 272         if (ret)
 273                 goto err_kms;
 274
 275         /*
 276          * with vblank_disable_allowed = true, vblank interrupt will be
 277          * disabled by drm timer once a current process gives up ownership
 278          * of vblank event. (after drm_vblank_put function is called)
 279          */
 280         drm->vblank_disable_allowed = true;
 281
 282         platform_set_drvdata(drm->platformdev, drm);
 283
 284         /* Now try and bind all our sub-components */
 285         ret = component_bind_all(drm->dev, drm);
 286         if (ret)
 287                 goto err_vblank;
 288
 289         /*
 290          * All components are now added, we can publish the connector sysfs
 291          * entries to userspace.  This will generate hotplug events and so
 292          * userspace will expect to be able to access DRM at this point.
 293          */
 294         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 295                 ret = drm_connector_register(connector);
 296                 if (ret) {
 297                         dev_err(drm->dev,
 298                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 299                                 connector->base.id,
 300                                 connector->name, ret);
 301                         goto err_unbind;
 302                 }
 303         }
 304
 305         /*
 306          * All components are now initialised, so setup the fb helper.
 307          * The fb helper takes copies of key hardware information, so the
 308          * crtcs/connectors/encoders must not change after this point.
 309          */
 310 #if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
 311         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 312                 dev_warn(drm->dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 313                 legacyfb_depth = 16;
 314         }
 315         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
 316                                 drm->mode_config.num_crtc, MAX_CRTC);
 317         if (IS_ERR(imxdrm->fbhelper)) {
 318                 ret = PTR_ERR(imxdrm->fbhelper);
 319                 imxdrm->fbhelper = NULL;
 320                 goto err_unbind;
 321         }
 322 #endif
 323
 324         drm_kms_helper_poll_init(drm);
 325
 326         return 0;
 327
 328 err_unbind:
 329         component_unbind_all(drm->dev, drm);
 330 err_vblank:
 331         drm_vblank_cleanup(drm);
 332 err_kms:
 333         drm_mode_config_cleanup(drm);
 334
 335         return ret;
 336 }
 337
 338 /*
 339  * imx_drm_add_crtc - add a new crtc
 340  */
 341 int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
 342                 struct imx_drm_crtc **new_crtc, struct drm_plane *primary_plane,
 343                 const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
 344                 struct device_node *port)
 345 {
 346         struct imx_drm_device *imxdrm = drm->dev_private;
 347         struct imx_drm_crtc *imx_drm_crtc;
 348         int ret;
 349
 350         /*
 351          * The vblank arrays are dimensioned by MAX_CRTC - we can't
 352          * pass IDs greater than this to those functions.
 353          */
 354         if (imxdrm->pipes >= MAX_CRTC)
 355                 return -EINVAL;
 356
 357         if (imxdrm->drm->open_count)
 358                 return -EBUSY;
 359
 360         imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
 361         if (!imx_drm_crtc)
 362                 return -ENOMEM;
 363
 364         imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
 365         imx_drm_crtc->pipe = imxdrm->pipes++;
 366         imx_drm_crtc->crtc = crtc;
 367
 368         crtc->port = port;
 369
 370         imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
 371
 372         *new_crtc = imx_drm_crtc;
 373
 374         ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
 375         if (ret)
 376                 goto err_register;
 377
 378         drm_crtc_helper_add(crtc,
 379                         imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
 380
 381         drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
 382                         imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
 383
 384         return 0;
 385
 386 err_register:
 387         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
 388         kfree(imx_drm_crtc);
 389         return ret;
 390 }
 391 EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
 392
 393 /*
 394  * imx_drm_remove_crtc - remove a crtc
 395  */
 396 int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
 397 {
 398         struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
 399
 400         drm_crtc_cleanup(imx_drm_crtc->crtc);
 401
 402         imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
 403
 404         kfree(imx_drm_crtc);
 405
 406         return 0;
 407 }
 408 EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
 409
 410 int imx_drm_encoder_parse_of(struct drm_device *drm,
 411         struct drm_encoder *encoder, struct device_node *np)
 412 {
 413         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 414
 415         /*
 416          * If we failed to find the CRTC(s) which this encoder is
 417          * supposed to be connected to, it's because the CRTC has
 418          * not been registered yet.  Defer probing, and hope that
 419          * the required CRTC is added later.
 420          */
 421         if (crtc_mask == 0)
 422                 return -EPROBE_DEFER;
 423
 424         encoder->possible_crtcs = crtc_mask;
 425
 426         /* FIXME: this is the mask of outputs which can clone this output. */
 427         encoder->possible_clones = ~0;
 428
 429         return 0;
 430 }
 431 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 432
 433 /*
 434  * @node: device tree node containing encoder input ports
 435  * @encoder: drm_encoder
 436  */
 437 int imx_drm_encoder_get_mux_id(struct device_node *node,
 438                                struct drm_encoder *encoder)
 439 {
 440         struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
 441         struct device_node *ep;
 442         struct of_endpoint endpoint;
 443         struct device_node *port;
 444         int ret;
 445
 446         if (!node || !imx_crtc)
 447                 return -EINVAL;
 448
 449         for_each_endpoint_of_node(node, ep) {
 450                 port = of_graph_get_remote_port(ep);
 451                 of_node_put(port);
 452                 if (port == imx_crtc->crtc->port) {
 453                         ret = of_graph_parse_endpoint(ep, &endpoint);
 454                         of_node_put(ep);
 455                         return ret ? ret : endpoint.port;
 456                 }
 457         }
 458
 459         return -EINVAL;
 460 }
 461 EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
 462
 463 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 464         /* none so far */
 465 };
 466
 467 static struct drm_driver imx_drm_driver = {
 468         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 469         .load                   = imx_drm_driver_load,
 470         .unload                 = imx_drm_driver_unload,
 471         .lastclose              = imx_drm_driver_lastclose,
 472         .preclose               = imx_drm_driver_preclose,
 473         .set_busid              = drm_platform_set_busid,
 474         .gem_free_object        = drm_gem_cma_free_object,
 475         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 476         .dumb_create            = drm_gem_cma_dumb_create,
 477         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 478         .dumb_destroy           = drm_gem_dumb_destroy,
 479
 480         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 481         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 482         .gem_prime_import       = drm_gem_prime_import,
 483         .gem_prime_export       = drm_gem_prime_export,
 484         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 485         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 486         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 487         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 488         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 489         .get_vblank_counter     = drm_vblank_no_hw_counter,
 490         .enable_vblank          = imx_drm_enable_vblank,
 491         .disable_vblank         = imx_drm_disable_vblank,
 492         .ioctls                 = imx_drm_ioctls,
 493         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 494         .fops                   = &imx_drm_driver_fops,
 495         .name                   = "imx-drm",
 496         .desc                   = "i.MX DRM graphics",
 497         .date                   = "20120507",
 498         .major                  = 1,
 499         .minor                  = 0,
 500         .patchlevel             = 0,
 501 };
 502
 503 static int compare_of(struct device *dev, void *data)
 504 {
 505         struct device_node *np = data;
 506
 507         /* Special case for LDB, one device for two channels */
 508         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 509                 np = of_get_parent(np);
 510                 of_node_put(np);
 511         }
 512
 513         return dev->of_node == np;
 514 }
 515
 516 static int imx_drm_bind(struct device *dev)
 517 {
 518         return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
 519 }
 520
 521 static void imx_drm_unbind(struct device *dev)
 522 {
 523         drm_put_dev(dev_get_drvdata(dev));
 524 }
 525
 526 static const struct component_master_ops imx_drm_ops = {
 527         .bind = imx_drm_bind,
 528         .unbind = imx_drm_unbind,
 529 };
 530
 531 static int imx_drm_platform_probe(struct platform_device *pdev)
 532 {
 533         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 534
 535         if (!ret)
 536                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 537
 538         return ret;
 539 }
 540
 541 static int imx_drm_platform_remove(struct platform_device *pdev)
 542 {
 543         component_master_del(&pdev->dev, &imx_drm_ops);
 544         return 0;
 545 }
 546
 547 #ifdef CONFIG_PM_SLEEP
 548 static int imx_drm_suspend(struct device *dev)
 549 {
 550         struct drm_device *drm_dev = dev_get_drvdata(dev);
 551
 552         /* The drm_dev is NULL before .load hook is called */
 553         if (drm_dev == NULL)
 554                 return 0;
 555
 556         drm_kms_helper_poll_disable(drm_dev);
 557
 558         return 0;
 559 }
 560
 561 static int imx_drm_resume(struct device *dev)
 562 {
 563         struct drm_device *drm_dev = dev_get_drvdata(dev);
 564
 565         if (drm_dev == NULL)
 566                 return 0;
 567
 568         drm_helper_resume_force_mode(drm_dev);
 569         drm_kms_helper_poll_enable(drm_dev);
 570
 571         return 0;
 572 }
 573 #endif
 574
 575 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 576
 577 static const struct of_device_id imx_drm_dt_ids[] = {
 578         { .compatible = "fsl,imx-display-subsystem", },
 579         { /* sentinel */ },
 580 };
 581 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 582
 583 static struct platform_driver imx_drm_pdrv = {
 584         .probe          = imx_drm_platform_probe,
 585         .remove         = imx_drm_platform_remove,
 586         .driver         = {
 587                 .name   = "imx-drm",
 588                 .pm     = &imx_drm_pm_ops,
 589                 .of_match_table = imx_drm_dt_ids,
 590         },
 591 };
 592 module_platform_driver(imx_drm_pdrv);
 593
 594 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 595 MODULE_DESCRIPTION("i.MX drm driver core");
 596 MODULE_LICENSE("GPL");