drivers/gpu/drm/rockchip/rockchip_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   4  * Author:Mark Yao <mark.yao@rock-chips.com>
   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/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_DATE     "20140818"
  43 #define DRIVER_MAJOR    1
  44 #define DRIVER_MINOR    0
  45
  46 static const struct drm_driver rockchip_drm_driver;
  47
  48 /*
  49  * Attach a (component) device to the shared drm dma mapping from master drm
  50  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  51  * mapping.
  52  */
  53 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  54                                    struct device *dev)
  55 {
  56         struct rockchip_drm_private *private = drm_dev->dev_private;
  57         int ret;
  58
  59         if (!private->domain)
  60                 return 0;
  61
  62         if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
  63                 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
  64
  65                 if (mapping) {
  66                         arm_iommu_detach_device(dev);
  67                         arm_iommu_release_mapping(mapping);
  68                 }
  69         }
  70
  71         ret = iommu_attach_device(private->domain, dev);
  72         if (ret) {
  73                 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
  74                 return ret;
  75         }
  76
  77         return 0;
  78 }
  79
  80 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  81                                     struct device *dev)
  82 {
  83         struct rockchip_drm_private *private = drm_dev->dev_private;
  84
  85         if (!private->domain)
  86                 return;
  87
  88         iommu_detach_device(private->domain, dev);
  89 }
  90
  91 void rockchip_drm_dma_init_device(struct drm_device *drm_dev,
  92                                   struct device *dev)
  93 {
  94         struct rockchip_drm_private *private = drm_dev->dev_private;
  95
  96         if (!device_iommu_mapped(dev))
  97                 private->iommu_dev = ERR_PTR(-ENODEV);
  98         else if (!private->iommu_dev)
  99                 private->iommu_dev = dev;
 100 }
 101
 102 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
 103 {
 104         struct rockchip_drm_private *private = drm_dev->dev_private;
 105         struct iommu_domain_geometry *geometry;
 106         u64 start, end;
 107         int ret;
 108
 109         if (IS_ERR_OR_NULL(private->iommu_dev))
 110                 return 0;
 111
 112         private->domain = iommu_paging_domain_alloc(private->iommu_dev);
 113         if (IS_ERR(private->domain)) {
 114                 ret = PTR_ERR(private->domain);
 115                 private->domain = NULL;
 116                 return ret;
 117         }
 118
 119         geometry = &private->domain->geometry;
 120         start = geometry->aperture_start;
 121         end = geometry->aperture_end;
 122
 123         DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
 124                   start, end);
 125         drm_mm_init(&private->mm, start, end - start + 1);
 126         mutex_init(&private->mm_lock);
 127
 128         return 0;
 129 }
 130
 131 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
 132 {
 133         struct rockchip_drm_private *private = drm_dev->dev_private;
 134
 135         if (!private->domain)
 136                 return;
 137
 138         drm_mm_takedown(&private->mm);
 139         iommu_domain_free(private->domain);
 140 }
 141
 142 static int rockchip_drm_bind(struct device *dev)
 143 {
 144         struct drm_device *drm_dev;
 145         struct rockchip_drm_private *private;
 146         int ret;
 147
 148         /* Remove existing drivers that may own the framebuffer memory. */
 149         ret = aperture_remove_all_conflicting_devices(rockchip_drm_driver.name);
 150         if (ret) {
 151                 DRM_DEV_ERROR(dev,
 152                               "Failed to remove existing framebuffers - %d.\n",
 153                               ret);
 154                 return ret;
 155         }
 156
 157         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 158         if (IS_ERR(drm_dev))
 159                 return PTR_ERR(drm_dev);
 160
 161         dev_set_drvdata(dev, drm_dev);
 162
 163         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 164         if (!private) {
 165                 ret = -ENOMEM;
 166                 goto err_free;
 167         }
 168
 169         drm_dev->dev_private = private;
 170
 171         ret = drmm_mode_config_init(drm_dev);
 172         if (ret)
 173                 goto err_free;
 174
 175         rockchip_drm_mode_config_init(drm_dev);
 176
 177         /* Try to bind all sub drivers. */
 178         ret = component_bind_all(dev, drm_dev);
 179         if (ret)
 180                 goto err_free;
 181
 182         ret = rockchip_drm_init_iommu(drm_dev);
 183         if (ret)
 184                 goto err_unbind_all;
 185
 186         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 187         if (ret)
 188                 goto err_iommu_cleanup;
 189
 190         drm_mode_config_reset(drm_dev);
 191
 192         /* init kms poll for handling hpd */
 193         drm_kms_helper_poll_init(drm_dev);
 194
 195         ret = drm_dev_register(drm_dev, 0);
 196         if (ret)
 197                 goto err_kms_helper_poll_fini;
 198
 199         drm_client_setup(drm_dev, NULL);
 200
 201         return 0;
 202 err_kms_helper_poll_fini:
 203         drm_kms_helper_poll_fini(drm_dev);
 204 err_iommu_cleanup:
 205         rockchip_iommu_cleanup(drm_dev);
 206 err_unbind_all:
 207         component_unbind_all(dev, drm_dev);
 208 err_free:
 209         drm_dev_put(drm_dev);
 210         return ret;
 211 }
 212
 213 static void rockchip_drm_unbind(struct device *dev)
 214 {
 215         struct drm_device *drm_dev = dev_get_drvdata(dev);
 216
 217         drm_dev_unregister(drm_dev);
 218
 219         drm_kms_helper_poll_fini(drm_dev);
 220
 221         drm_atomic_helper_shutdown(drm_dev);
 222         component_unbind_all(dev, drm_dev);
 223         rockchip_iommu_cleanup(drm_dev);
 224
 225         drm_dev_put(drm_dev);
 226 }
 227
 228 DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops);
 229
 230 static const struct drm_driver rockchip_drm_driver = {
 231         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 232         .dumb_create            = rockchip_gem_dumb_create,
 233         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 234         DRM_FBDEV_DMA_DRIVER_OPS,
 235         .fops                   = &rockchip_drm_driver_fops,
 236         .name   = DRIVER_NAME,
 237         .desc   = DRIVER_DESC,
 238         .date   = DRIVER_DATE,
 239         .major  = DRIVER_MAJOR,
 240         .minor  = DRIVER_MINOR,
 241 };
 242
 243 #ifdef CONFIG_PM_SLEEP
 244 static int rockchip_drm_sys_suspend(struct device *dev)
 245 {
 246         struct drm_device *drm = dev_get_drvdata(dev);
 247
 248         return drm_mode_config_helper_suspend(drm);
 249 }
 250
 251 static int rockchip_drm_sys_resume(struct device *dev)
 252 {
 253         struct drm_device *drm = dev_get_drvdata(dev);
 254
 255         return drm_mode_config_helper_resume(drm);
 256 }
 257 #endif
 258
 259 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 260         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 261                                 rockchip_drm_sys_resume)
 262 };
 263
 264 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 265 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 266 static int num_rockchip_sub_drivers;
 267
 268 /*
 269  * Get the endpoint id of the remote endpoint of the given encoder. This
 270  * information is used by the VOP2 driver to identify the encoder.
 271  *
 272  * @rkencoder: The encoder to get the remote endpoint id from
 273  * @np: The encoder device node
 274  * @port: The number of the port leading to the VOP2
 275  * @reg: The endpoint number leading to the VOP2
 276  */
 277 int rockchip_drm_encoder_set_crtc_endpoint_id(struct rockchip_encoder *rkencoder,
 278                                               struct device_node *np, int port, int reg)
 279 {
 280         struct of_endpoint ep;
 281         struct device_node *en, *ren;
 282         int ret;
 283
 284         en = of_graph_get_endpoint_by_regs(np, port, reg);
 285         if (!en)
 286                 return -ENOENT;
 287
 288         ren = of_graph_get_remote_endpoint(en);
 289         if (!ren)
 290                 return -ENOENT;
 291
 292         ret = of_graph_parse_endpoint(ren, &ep);
 293         if (ret)
 294                 return ret;
 295
 296         rkencoder->crtc_endpoint_id = ep.id;
 297
 298         return 0;
 299 }
 300
 301 /*
 302  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 303  * Should be called from the component bind stage of the drivers
 304  * to ensure that all subdrivers are probed.
 305  *
 306  * @ep: endpoint of a rockchip vop
 307  *
 308  * returns true if subdriver, false if external bridge and -ENODEV
 309  * if remote port does not contain a device.
 310  */
 311 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 312 {
 313         struct device_node *node = of_graph_get_remote_port_parent(ep);
 314         struct platform_device *pdev;
 315         struct device_driver *drv;
 316         int i;
 317
 318         if (!node)
 319                 return -ENODEV;
 320
 321         /* status disabled will prevent creation of platform-devices */
 322         if (!of_device_is_available(node)) {
 323                 of_node_put(node);
 324                 return -ENODEV;
 325         }
 326
 327         pdev = of_find_device_by_node(node);
 328         of_node_put(node);
 329
 330         /* enabled non-platform-devices can immediately return here */
 331         if (!pdev)
 332                 return false;
 333
 334         /*
 335          * All rockchip subdrivers have probed at this point, so
 336          * any device not having a driver now is an external bridge.
 337          */
 338         drv = pdev->dev.driver;
 339         if (!drv) {
 340                 platform_device_put(pdev);
 341                 return false;
 342         }
 343
 344         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 345                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 346                         platform_device_put(pdev);
 347                         return true;
 348                 }
 349         }
 350
 351         platform_device_put(pdev);
 352         return false;
 353 }
 354
 355 static void rockchip_drm_match_remove(struct device *dev)
 356 {
 357         struct device_link *link;
 358
 359         list_for_each_entry(link, &dev->links.consumers, s_node)
 360                 device_link_del(link);
 361 }
 362
 363 /* list of preferred vop devices */
 364 static const char *const rockchip_drm_match_preferred[] = {
 365         "rockchip,rk3399-vop-big",
 366         NULL,
 367 };
 368
 369 static struct component_match *rockchip_drm_match_add(struct device *dev)
 370 {
 371         struct component_match *match = NULL;
 372         struct device_node *port;
 373         int i;
 374
 375         /* add preferred vop device match before adding driver device matches */
 376         for (i = 0; ; i++) {
 377                 port = of_parse_phandle(dev->of_node, "ports", i);
 378                 if (!port)
 379                         break;
 380
 381                 if (of_device_is_available(port->parent) &&
 382                     of_device_compatible_match(port->parent,
 383                                                rockchip_drm_match_preferred))
 384                         drm_of_component_match_add(dev, &match,
 385                                                    component_compare_of,
 386                                                    port->parent);
 387
 388                 of_node_put(port);
 389         }
 390
 391         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 392                 struct platform_driver *drv = rockchip_sub_drivers[i];
 393                 struct device *p = NULL, *d;
 394
 395                 do {
 396                         d = platform_find_device_by_driver(p, &drv->driver);
 397                         put_device(p);
 398                         p = d;
 399
 400                         if (!d)
 401                                 break;
 402
 403                         device_link_add(dev, d, DL_FLAG_STATELESS);
 404                         component_match_add(dev, &match, component_compare_dev, d);
 405                 } while (true);
 406         }
 407
 408         if (IS_ERR(match))
 409                 rockchip_drm_match_remove(dev);
 410
 411         return match ?: ERR_PTR(-ENODEV);
 412 }
 413
 414 static const struct component_master_ops rockchip_drm_ops = {
 415         .bind = rockchip_drm_bind,
 416         .unbind = rockchip_drm_unbind,
 417 };
 418
 419 static int rockchip_drm_platform_of_probe(struct device *dev)
 420 {
 421         struct device_node *np = dev->of_node;
 422         struct device_node *port;
 423         bool found = false;
 424         int i;
 425
 426         if (!np)
 427                 return -ENODEV;
 428
 429         for (i = 0;; i++) {
 430                 port = of_parse_phandle(np, "ports", i);
 431                 if (!port)
 432                         break;
 433
 434                 if (!of_device_is_available(port->parent)) {
 435                         of_node_put(port);
 436                         continue;
 437                 }
 438
 439                 found = true;
 440                 of_node_put(port);
 441         }
 442
 443         if (i == 0) {
 444                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 445                 return -ENODEV;
 446         }
 447
 448         if (!found) {
 449                 DRM_DEV_ERROR(dev,
 450                               "No available vop found for display-subsystem.\n");
 451                 return -ENODEV;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 458 {
 459         struct device *dev = &pdev->dev;
 460         struct component_match *match = NULL;
 461         int ret;
 462
 463         ret = rockchip_drm_platform_of_probe(dev);
 464         if (ret)
 465                 return ret;
 466
 467         match = rockchip_drm_match_add(dev);
 468         if (IS_ERR(match))
 469                 return PTR_ERR(match);
 470
 471         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 472         if (ret < 0) {
 473                 rockchip_drm_match_remove(dev);
 474                 return ret;
 475         }
 476
 477         return 0;
 478 }
 479
 480 static void rockchip_drm_platform_remove(struct platform_device *pdev)
 481 {
 482         component_master_del(&pdev->dev, &rockchip_drm_ops);
 483
 484         rockchip_drm_match_remove(&pdev->dev);
 485 }
 486
 487 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 488 {
 489         struct drm_device *drm = platform_get_drvdata(pdev);
 490
 491         if (drm)
 492                 drm_atomic_helper_shutdown(drm);
 493 }
 494
 495 static const struct of_device_id rockchip_drm_dt_ids[] = {
 496         { .compatible = "rockchip,display-subsystem", },
 497         { /* sentinel */ },
 498 };
 499 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 500
 501 static struct platform_driver rockchip_drm_platform_driver = {
 502         .probe = rockchip_drm_platform_probe,
 503         .remove = rockchip_drm_platform_remove,
 504         .shutdown = rockchip_drm_platform_shutdown,
 505         .driver = {
 506                 .name = "rockchip-drm",
 507                 .of_match_table = rockchip_drm_dt_ids,
 508                 .pm = &rockchip_drm_pm_ops,
 509         },
 510 };
 511
 512 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 513         if (IS_ENABLED(cond) && \
 514             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 515                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 516 }
 517
 518 static int __init rockchip_drm_init(void)
 519 {
 520         int ret;
 521
 522         if (drm_firmware_drivers_only())
 523                 return -ENODEV;
 524
 525         num_rockchip_sub_drivers = 0;
 526         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_ROCKCHIP_VOP);
 527         ADD_ROCKCHIP_SUB_DRIVER(vop2_platform_driver, CONFIG_ROCKCHIP_VOP2);
 528         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 529                                 CONFIG_ROCKCHIP_LVDS);
 530         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 531                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 532         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 533         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 534                                 CONFIG_ROCKCHIP_DW_HDMI);
 535         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_qp_rockchip_pltfm_driver,
 536                                 CONFIG_ROCKCHIP_DW_HDMI_QP);
 537         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 538                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 539         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 540         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 541                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 542
 543         ret = platform_register_drivers(rockchip_sub_drivers,
 544                                         num_rockchip_sub_drivers);
 545         if (ret)
 546                 return ret;
 547
 548         ret = platform_driver_register(&rockchip_drm_platform_driver);
 549         if (ret)
 550                 goto err_unreg_drivers;
 551
 552         return 0;
 553
 554 err_unreg_drivers:
 555         platform_unregister_drivers(rockchip_sub_drivers,
 556                                     num_rockchip_sub_drivers);
 557         return ret;
 558 }
 559
 560 static void __exit rockchip_drm_fini(void)
 561 {
 562         platform_driver_unregister(&rockchip_drm_platform_driver);
 563
 564         platform_unregister_drivers(rockchip_sub_drivers,
 565                                     num_rockchip_sub_drivers);
 566 }
 567
 568 module_init(rockchip_drm_init);
 569 module_exit(rockchip_drm_fini);
 570
 571 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 572 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 573 MODULE_LICENSE("GPL v2");