drivers/gpu/drm/rockchip/rockchip_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Rockchip Electronics Co., Ltd.
   4  * Author:Mark Yao <[email protected]>
   5  *
   6  * based on exynos_drm_drv.c
   7  */
   8
   9 #include <linux/aperture.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/pm_runtime.h>
  13 #include <linux/module.h>
  14 #include <linux/of_graph.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/component.h>
  17 #include <linux/console.h>
  18 #include <linux/iommu.h>
  19
  20 #include <drm/clients/drm_client_setup.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fbdev_dma.h>
  23 #include <drm/drm_gem_dma_helper.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_probe_helper.h>
  26 #include <drm/drm_vblank.h>
  27
  28 #if defined(CONFIG_ARM_DMA_USE_IOMMU)
  29 #include <asm/dma-iommu.h>
  30 #else
  31 #define arm_iommu_detach_device(...)    ({ })
  32 #define arm_iommu_release_mapping(...)  ({ })
  33 #define to_dma_iommu_mapping(dev) NULL
  34 #endif
  35
  36 #include "rockchip_drm_drv.h"
  37 #include "rockchip_drm_fb.h"
  38 #include "rockchip_drm_gem.h"
  39
  40 #define DRIVER_NAME     "rockchip"
  41 #define DRIVER_DESC     "RockChip Soc DRM"
  42 #define DRIVER_MAJOR    1
  43 #define DRIVER_MINOR    0
  44
  45 static const struct drm_driver rockchip_drm_driver;
  46
  47 /*
  48  * Attach a (component) device to the shared drm dma mapping from master drm
  49  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  50  * mapping.
  51  */
  52 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  53                                    struct device *dev)
  54 {
  55         struct rockchip_drm_private *private = drm_dev->dev_private;
  56         int ret;
  57
  58         if (!private->domain)
  59                 return 0;
  60
  61         if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
  62                 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
  63
  64                 if (mapping) {
  65                         arm_iommu_detach_device(dev);
  66                         arm_iommu_release_mapping(mapping);
  67                 }
  68         }
  69
  70         ret = iommu_attach_device(private->domain, dev);
  71         if (ret) {
  72                 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
  73                 return ret;
  74         }
  75
  76         return 0;
  77 }
  78
  79 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  80                                     struct device *dev)
  81 {
  82         struct rockchip_drm_private *private = drm_dev->dev_private;
  83
  84         if (!private->domain)
  85                 return;
  86
  87         iommu_detach_device(private->domain, dev);
  88 }
  89
  90 void rockchip_drm_dma_init_device(struct drm_device *drm_dev,
  91                                   struct device *dev)
  92 {
  93         struct rockchip_drm_private *private = drm_dev->dev_private;
  94
  95         if (!device_iommu_mapped(dev))
  96                 private->iommu_dev = ERR_PTR(-ENODEV);
  97         else if (!private->iommu_dev)
  98                 private->iommu_dev = dev;
  99 }
 100
 101 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
 102 {
 103         struct rockchip_drm_private *private = drm_dev->dev_private;
 104         struct iommu_domain_geometry *geometry;
 105         u64 start, end;
 106         int ret;
 107
 108         if (IS_ERR_OR_NULL(private->iommu_dev))
 109                 return 0;
 110
 111         private->domain = iommu_paging_domain_alloc(private->iommu_dev);
 112         if (IS_ERR(private->domain)) {
 113                 ret = PTR_ERR(private->domain);
 114                 private->domain = NULL;
 115                 return ret;
 116         }
 117
 118         geometry = &private->domain->geometry;
 119         start = geometry->aperture_start;
 120         end = geometry->aperture_end;
 121
 122         DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
 123                   start, end);
 124         drm_mm_init(&private->mm, start, end - start + 1);
 125         mutex_init(&private->mm_lock);
 126
 127         return 0;
 128 }
 129
 130 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
 131 {
 132         struct rockchip_drm_private *private = drm_dev->dev_private;
 133
 134         if (!private->domain)
 135                 return;
 136
 137         drm_mm_takedown(&private->mm);
 138         iommu_domain_free(private->domain);
 139 }
 140
 141 static int rockchip_drm_bind(struct device *dev)
 142 {
 143         struct drm_device *drm_dev;
 144         struct rockchip_drm_private *private;
 145         int ret;
 146
 147         /* Remove existing drivers that may own the framebuffer memory. */
 148         ret = aperture_remove_all_conflicting_devices(rockchip_drm_driver.name);
 149         if (ret) {
 150                 DRM_DEV_ERROR(dev,
 151                               "Failed to remove existing framebuffers - %d.\n",
 152                               ret);
 153                 return ret;
 154         }
 155
 156         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 157         if (IS_ERR(drm_dev))
 158                 return PTR_ERR(drm_dev);
 159
 160         dev_set_drvdata(dev, drm_dev);
 161
 162         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 163         if (!private) {
 164                 ret = -ENOMEM;
 165                 goto err_free;
 166         }
 167
 168         drm_dev->dev_private = private;
 169
 170         ret = drmm_mode_config_init(drm_dev);
 171         if (ret)
 172                 goto err_free;
 173
 174         rockchip_drm_mode_config_init(drm_dev);
 175
 176         /* Try to bind all sub drivers. */
 177         ret = component_bind_all(dev, drm_dev);
 178         if (ret)
 179                 goto err_free;
 180
 181         ret = rockchip_drm_init_iommu(drm_dev);
 182         if (ret)
 183                 goto err_unbind_all;
 184
 185         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 186         if (ret)
 187                 goto err_iommu_cleanup;
 188
 189         drm_mode_config_reset(drm_dev);
 190
 191         /* init kms poll for handling hpd */
 192         drm_kms_helper_poll_init(drm_dev);
 193
 194         ret = drm_dev_register(drm_dev, 0);
 195         if (ret)
 196                 goto err_kms_helper_poll_fini;
 197
 198         drm_client_setup(drm_dev, NULL);
 199
 200         return 0;
 201 err_kms_helper_poll_fini:
 202         drm_kms_helper_poll_fini(drm_dev);
 203 err_iommu_cleanup:
 204         rockchip_iommu_cleanup(drm_dev);
 205 err_unbind_all:
 206         component_unbind_all(dev, drm_dev);
 207 err_free:
 208         drm_dev_put(drm_dev);
 209         return ret;
 210 }
 211
 212 static void rockchip_drm_unbind(struct device *dev)
 213 {
 214         struct drm_device *drm_dev = dev_get_drvdata(dev);
 215
 216         drm_dev_unregister(drm_dev);
 217
 218         drm_kms_helper_poll_fini(drm_dev);
 219
 220         drm_atomic_helper_shutdown(drm_dev);
 221         component_unbind_all(dev, drm_dev);
 222         rockchip_iommu_cleanup(drm_dev);
 223
 224         drm_dev_put(drm_dev);
 225 }
 226
 227 DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops);
 228
 229 static const struct drm_driver rockchip_drm_driver = {
 230         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 231         .dumb_create            = rockchip_gem_dumb_create,
 232         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 233         DRM_FBDEV_DMA_DRIVER_OPS,
 234         .fops                   = &rockchip_drm_driver_fops,
 235         .name   = DRIVER_NAME,
 236         .desc   = DRIVER_DESC,
 237         .major  = DRIVER_MAJOR,
 238         .minor  = DRIVER_MINOR,
 239 };
 240
 241 #ifdef CONFIG_PM_SLEEP
 242 static int rockchip_drm_sys_suspend(struct device *dev)
 243 {
 244         struct drm_device *drm = dev_get_drvdata(dev);
 245
 246         return drm_mode_config_helper_suspend(drm);
 247 }
 248
 249 static int rockchip_drm_sys_resume(struct device *dev)
 250 {
 251         struct drm_device *drm = dev_get_drvdata(dev);
 252
 253         return drm_mode_config_helper_resume(drm);
 254 }
 255 #endif
 256
 257 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 258         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 259                                 rockchip_drm_sys_resume)
 260 };
 261
 262 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 263 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 264 static int num_rockchip_sub_drivers;
 265
 266 /*
 267  * Get the endpoint id of the remote endpoint of the given encoder. This
 268  * information is used by the VOP2 driver to identify the encoder.
 269  *
 270  * @rkencoder: The encoder to get the remote endpoint id from
 271  * @np: The encoder device node
 272  * @port: The number of the port leading to the VOP2
 273  * @reg: The endpoint number leading to the VOP2
 274  */
 275 int rockchip_drm_encoder_set_crtc_endpoint_id(struct rockchip_encoder *rkencoder,
 276                                               struct device_node *np, int port, int reg)
 277 {
 278         struct of_endpoint ep;
 279         struct device_node *en, *ren;
 280         int ret;
 281
 282         en = of_graph_get_endpoint_by_regs(np, port, reg);
 283         if (!en)
 284                 return -ENOENT;
 285
 286         ren = of_graph_get_remote_endpoint(en);
 287         if (!ren)
 288                 return -ENOENT;
 289
 290         ret = of_graph_parse_endpoint(ren, &ep);
 291         if (ret)
 292                 return ret;
 293
 294         rkencoder->crtc_endpoint_id = ep.id;
 295
 296         return 0;
 297 }
 298
 299 /*
 300  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 301  * Should be called from the component bind stage of the drivers
 302  * to ensure that all subdrivers are probed.
 303  *
 304  * @ep: endpoint of a rockchip vop
 305  *
 306  * returns true if subdriver, false if external bridge and -ENODEV
 307  * if remote port does not contain a device.
 308  */
 309 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 310 {
 311         struct device_node *node = of_graph_get_remote_port_parent(ep);
 312         struct platform_device *pdev;
 313         struct device_driver *drv;
 314         int i;
 315
 316         if (!node)
 317                 return -ENODEV;
 318
 319         /* status disabled will prevent creation of platform-devices */
 320         if (!of_device_is_available(node)) {
 321                 of_node_put(node);
 322                 return -ENODEV;
 323         }
 324
 325         pdev = of_find_device_by_node(node);
 326         of_node_put(node);
 327
 328         /* enabled non-platform-devices can immediately return here */
 329         if (!pdev)
 330                 return false;
 331
 332         /*
 333          * All rockchip subdrivers have probed at this point, so
 334          * any device not having a driver now is an external bridge.
 335          */
 336         drv = pdev->dev.driver;
 337         if (!drv) {
 338                 platform_device_put(pdev);
 339                 return false;
 340         }
 341
 342         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 343                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 344                         platform_device_put(pdev);
 345                         return true;
 346                 }
 347         }
 348
 349         platform_device_put(pdev);
 350         return false;
 351 }
 352
 353 static void rockchip_drm_match_remove(struct device *dev)
 354 {
 355         struct device_link *link;
 356
 357         list_for_each_entry(link, &dev->links.consumers, s_node)
 358                 device_link_del(link);
 359 }
 360
 361 /* list of preferred vop devices */
 362 static const char *const rockchip_drm_match_preferred[] = {
 363         "rockchip,rk3399-vop-big",
 364         NULL,
 365 };
 366
 367 static struct component_match *rockchip_drm_match_add(struct device *dev)
 368 {
 369         struct component_match *match = NULL;
 370         struct device_node *port;
 371         int i;
 372
 373         /* add preferred vop device match before adding driver device matches */
 374         for (i = 0; ; i++) {
 375                 port = of_parse_phandle(dev->of_node, "ports", i);
 376                 if (!port)
 377                         break;
 378
 379                 if (of_device_is_available(port->parent) &&
 380                     of_device_compatible_match(port->parent,
 381                                                rockchip_drm_match_preferred))
 382                         drm_of_component_match_add(dev, &match,
 383                                                    component_compare_of,
 384                                                    port->parent);
 385
 386                 of_node_put(port);
 387         }
 388
 389         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 390                 struct platform_driver *drv = rockchip_sub_drivers[i];
 391                 struct device *p = NULL, *d;
 392
 393                 do {
 394                         d = platform_find_device_by_driver(p, &drv->driver);
 395                         put_device(p);
 396                         p = d;
 397
 398                         if (!d)
 399                                 break;
 400
 401                         device_link_add(dev, d, DL_FLAG_STATELESS);
 402                         component_match_add(dev, &match, component_compare_dev, d);
 403                 } while (true);
 404         }
 405
 406         if (IS_ERR(match))
 407                 rockchip_drm_match_remove(dev);
 408
 409         return match ?: ERR_PTR(-ENODEV);
 410 }
 411
 412 static const struct component_master_ops rockchip_drm_ops = {
 413         .bind = rockchip_drm_bind,
 414         .unbind = rockchip_drm_unbind,
 415 };
 416
 417 static int rockchip_drm_platform_of_probe(struct device *dev)
 418 {
 419         struct device_node *np = dev->of_node;
 420         struct device_node *port;
 421         bool found = false;
 422         int i;
 423
 424         if (!np)
 425                 return -ENODEV;
 426
 427         for (i = 0;; i++) {
 428                 port = of_parse_phandle(np, "ports", i);
 429                 if (!port)
 430                         break;
 431
 432                 if (!of_device_is_available(port->parent)) {
 433                         of_node_put(port);
 434                         continue;
 435                 }
 436
 437                 found = true;
 438                 of_node_put(port);
 439         }
 440
 441         if (i == 0) {
 442                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 443                 return -ENODEV;
 444         }
 445
 446         if (!found) {
 447                 DRM_DEV_ERROR(dev,
 448                               "No available vop found for display-subsystem.\n");
 449                 return -ENODEV;
 450         }
 451
 452         return 0;
 453 }
 454
 455 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 456 {
 457         struct device *dev = &pdev->dev;
 458         struct component_match *match = NULL;
 459         int ret;
 460
 461         ret = rockchip_drm_platform_of_probe(dev);
 462         if (ret)
 463                 return ret;
 464
 465         match = rockchip_drm_match_add(dev);
 466         if (IS_ERR(match))
 467                 return PTR_ERR(match);
 468
 469         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 470         if (ret < 0) {
 471                 rockchip_drm_match_remove(dev);
 472                 return ret;
 473         }
 474
 475         return 0;
 476 }
 477
 478 static void rockchip_drm_platform_remove(struct platform_device *pdev)
 479 {
 480         component_master_del(&pdev->dev, &rockchip_drm_ops);
 481
 482         rockchip_drm_match_remove(&pdev->dev);
 483 }
 484
 485 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 486 {
 487         struct drm_device *drm = platform_get_drvdata(pdev);
 488
 489         drm_atomic_helper_shutdown(drm);
 490 }
 491
 492 static const struct of_device_id rockchip_drm_dt_ids[] = {
 493         { .compatible = "rockchip,display-subsystem", },
 494         { /* sentinel */ },
 495 };
 496 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 497
 498 static struct platform_driver rockchip_drm_platform_driver = {
 499         .probe = rockchip_drm_platform_probe,
 500         .remove = rockchip_drm_platform_remove,
 501         .shutdown = rockchip_drm_platform_shutdown,
 502         .driver = {
 503                 .name = "rockchip-drm",
 504                 .of_match_table = rockchip_drm_dt_ids,
 505                 .pm = &rockchip_drm_pm_ops,
 506         },
 507 };
 508
 509 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 510         if (IS_ENABLED(cond) && \
 511             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 512                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 513 }
 514
 515 static int __init rockchip_drm_init(void)
 516 {
 517         int ret;
 518
 519         if (drm_firmware_drivers_only())
 520                 return -ENODEV;
 521
 522         num_rockchip_sub_drivers = 0;
 523         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_ROCKCHIP_VOP);
 524         ADD_ROCKCHIP_SUB_DRIVER(vop2_platform_driver, CONFIG_ROCKCHIP_VOP2);
 525         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 526                                 CONFIG_ROCKCHIP_LVDS);
 527         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 528                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 529         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 530         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 531                                 CONFIG_ROCKCHIP_DW_HDMI);
 532         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_qp_rockchip_pltfm_driver,
 533                                 CONFIG_ROCKCHIP_DW_HDMI_QP);
 534         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 535                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 536         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi2_rockchip_driver,
 537                                 CONFIG_ROCKCHIP_DW_MIPI_DSI2);
 538         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 539         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 540                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 541
 542         ret = platform_register_drivers(rockchip_sub_drivers,
 543                                         num_rockchip_sub_drivers);
 544         if (ret)
 545                 return ret;
 546
 547         ret = platform_driver_register(&rockchip_drm_platform_driver);
 548         if (ret)
 549                 goto err_unreg_drivers;
 550
 551         return 0;
 552
 553 err_unreg_drivers:
 554         platform_unregister_drivers(rockchip_sub_drivers,
 555                                     num_rockchip_sub_drivers);
 556         return ret;
 557 }
 558
 559 static void __exit rockchip_drm_fini(void)
 560 {
 561         platform_driver_unregister(&rockchip_drm_platform_driver);
 562
 563         platform_unregister_drivers(rockchip_sub_drivers,
 564                                     num_rockchip_sub_drivers);
 565 }
 566
 567 module_init(rockchip_drm_init);
 568 module_exit(rockchip_drm_fini);
 569
 570 MODULE_AUTHOR("Mark Yao <[email protected]>");
 571 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 572 MODULE_LICENSE("GPL v2");