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