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