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/dma-mapping.h>
  10 #include <linux/pm_runtime.h>
  11 #include <linux/module.h>
  12 #include <linux/of_graph.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/component.h>
  15 #include <linux/console.h>
  16 #include <linux/iommu.h>
  17
  18 #include <drm/drm_aperture.h>
  19 #include <drm/drm_drv.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_gem_cma_helper.h>
  22 #include <drm/drm_of.h>
  23 #include <drm/drm_probe_helper.h>
  24 #include <drm/drm_vblank.h>
  25
  26 #if defined(CONFIG_ARM_DMA_USE_IOMMU)
  27 #include <asm/dma-iommu.h>
  28 #else
  29 #define arm_iommu_detach_device(...)    ({ })
  30 #define arm_iommu_release_mapping(...)  ({ })
  31 #define to_dma_iommu_mapping(dev) NULL
  32 #endif
  33
  34 #include "rockchip_drm_drv.h"
  35 #include "rockchip_drm_fb.h"
  36 #include "rockchip_drm_gem.h"
  37
  38 #define DRIVER_NAME     "rockchip"
  39 #define DRIVER_DESC     "RockChip Soc DRM"
  40 #define DRIVER_DATE     "20140818"
  41 #define DRIVER_MAJOR    1
  42 #define DRIVER_MINOR    0
  43
  44 static const struct drm_driver rockchip_drm_driver;
  45
  46 /*
  47  * Attach a (component) device to the shared drm dma mapping from master drm
  48  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  49  * mapping.
  50  */
  51 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  52                                    struct device *dev)
  53 {
  54         struct rockchip_drm_private *private = drm_dev->dev_private;
  55         int ret;
  56
  57         if (!private->domain)
  58                 return 0;
  59
  60         if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
  61                 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);
  62
  63                 if (mapping) {
  64                         arm_iommu_detach_device(dev);
  65                         arm_iommu_release_mapping(mapping);
  66                 }
  67         }
  68
  69         ret = iommu_attach_device(private->domain, dev);
  70         if (ret) {
  71                 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
  72                 return ret;
  73         }
  74
  75         return 0;
  76 }
  77
  78 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  79                                     struct device *dev)
  80 {
  81         struct rockchip_drm_private *private = drm_dev->dev_private;
  82
  83         if (!private->domain)
  84                 return;
  85
  86         iommu_detach_device(private->domain, dev);
  87 }
  88
  89 void rockchip_drm_dma_init_device(struct drm_device *drm_dev,
  90                                   struct device *dev)
  91 {
  92         struct rockchip_drm_private *private = drm_dev->dev_private;
  93
  94         if (!device_iommu_mapped(dev))
  95                 private->iommu_dev = ERR_PTR(-ENODEV);
  96         else if (!private->iommu_dev)
  97                 private->iommu_dev = dev;
  98 }
  99
 100 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
 101 {
 102         struct rockchip_drm_private *private = drm_dev->dev_private;
 103         struct iommu_domain_geometry *geometry;
 104         u64 start, end;
 105
 106         if (IS_ERR_OR_NULL(private->iommu_dev))
 107                 return 0;
 108
 109         private->domain = iommu_domain_alloc(private->iommu_dev->bus);
 110         if (!private->domain)
 111                 return -ENOMEM;
 112
 113         geometry = &private->domain->geometry;
 114         start = geometry->aperture_start;
 115         end = geometry->aperture_end;
 116
 117         DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
 118                   start, end);
 119         drm_mm_init(&private->mm, start, end - start + 1);
 120         mutex_init(&private->mm_lock);
 121
 122         return 0;
 123 }
 124
 125 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
 126 {
 127         struct rockchip_drm_private *private = drm_dev->dev_private;
 128
 129         if (!private->domain)
 130                 return;
 131
 132         drm_mm_takedown(&private->mm);
 133         iommu_domain_free(private->domain);
 134 }
 135
 136 static int rockchip_drm_bind(struct device *dev)
 137 {
 138         struct drm_device *drm_dev;
 139         struct rockchip_drm_private *private;
 140         int ret;
 141
 142         /* Remove existing drivers that may own the framebuffer memory. */
 143         ret = drm_aperture_remove_framebuffers(false, &rockchip_drm_driver);
 144         if (ret) {
 145                 DRM_DEV_ERROR(dev,
 146                               "Failed to remove existing framebuffers - %d.\n",
 147                               ret);
 148                 return ret;
 149         }
 150
 151         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 152         if (IS_ERR(drm_dev))
 153                 return PTR_ERR(drm_dev);
 154
 155         dev_set_drvdata(dev, drm_dev);
 156
 157         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 158         if (!private) {
 159                 ret = -ENOMEM;
 160                 goto err_free;
 161         }
 162
 163         drm_dev->dev_private = private;
 164
 165         ret = drmm_mode_config_init(drm_dev);
 166         if (ret)
 167                 goto err_free;
 168
 169         rockchip_drm_mode_config_init(drm_dev);
 170
 171         /* Try to bind all sub drivers. */
 172         ret = component_bind_all(dev, drm_dev);
 173         if (ret)
 174                 goto err_free;
 175
 176         ret = rockchip_drm_init_iommu(drm_dev);
 177         if (ret)
 178                 goto err_unbind_all;
 179
 180         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 181         if (ret)
 182                 goto err_iommu_cleanup;
 183
 184         drm_mode_config_reset(drm_dev);
 185
 186         /* init kms poll for handling hpd */
 187         drm_kms_helper_poll_init(drm_dev);
 188
 189         ret = drm_dev_register(drm_dev, 0);
 190         if (ret)
 191                 goto err_kms_helper_poll_fini;
 192
 193         drm_fbdev_generic_setup(drm_dev, 0);
 194
 195         return 0;
 196 err_kms_helper_poll_fini:
 197         drm_kms_helper_poll_fini(drm_dev);
 198 err_iommu_cleanup:
 199         rockchip_iommu_cleanup(drm_dev);
 200 err_unbind_all:
 201         component_unbind_all(dev, drm_dev);
 202 err_free:
 203         drm_dev_put(drm_dev);
 204         return ret;
 205 }
 206
 207 static void rockchip_drm_unbind(struct device *dev)
 208 {
 209         struct drm_device *drm_dev = dev_get_drvdata(dev);
 210
 211         drm_dev_unregister(drm_dev);
 212
 213         drm_kms_helper_poll_fini(drm_dev);
 214
 215         drm_atomic_helper_shutdown(drm_dev);
 216         component_unbind_all(dev, drm_dev);
 217         rockchip_iommu_cleanup(drm_dev);
 218
 219         drm_dev_put(drm_dev);
 220 }
 221
 222 DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops);
 223
 224 static const struct drm_driver rockchip_drm_driver = {
 225         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 226         .dumb_create            = rockchip_gem_dumb_create,
 227         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 228         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 229         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 230         .gem_prime_mmap         = drm_gem_prime_mmap,
 231         .fops                   = &rockchip_drm_driver_fops,
 232         .name   = DRIVER_NAME,
 233         .desc   = DRIVER_DESC,
 234         .date   = DRIVER_DATE,
 235         .major  = DRIVER_MAJOR,
 236         .minor  = DRIVER_MINOR,
 237 };
 238
 239 #ifdef CONFIG_PM_SLEEP
 240 static int rockchip_drm_sys_suspend(struct device *dev)
 241 {
 242         struct drm_device *drm = dev_get_drvdata(dev);
 243
 244         return drm_mode_config_helper_suspend(drm);
 245 }
 246
 247 static int rockchip_drm_sys_resume(struct device *dev)
 248 {
 249         struct drm_device *drm = dev_get_drvdata(dev);
 250
 251         return drm_mode_config_helper_resume(drm);
 252 }
 253 #endif
 254
 255 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 256         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 257                                 rockchip_drm_sys_resume)
 258 };
 259
 260 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 261 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 262 static int num_rockchip_sub_drivers;
 263
 264 /*
 265  * Get the endpoint id of the remote endpoint of the given encoder. This
 266  * information is used by the VOP2 driver to identify the encoder.
 267  *
 268  * @rkencoder: The encoder to get the remote endpoint id from
 269  * @np: The encoder device node
 270  * @port: The number of the port leading to the VOP2
 271  * @reg: The endpoint number leading to the VOP2
 272  */
 273 int rockchip_drm_encoder_set_crtc_endpoint_id(struct rockchip_encoder *rkencoder,
 274                                               struct device_node *np, int port, int reg)
 275 {
 276         struct of_endpoint ep;
 277         struct device_node *en, *ren;
 278         int ret;
 279
 280         en = of_graph_get_endpoint_by_regs(np, port, reg);
 281         if (!en)
 282                 return -ENOENT;
 283
 284         ren = of_graph_get_remote_endpoint(en);
 285         if (!ren)
 286                 return -ENOENT;
 287
 288         ret = of_graph_parse_endpoint(ren, &ep);
 289         if (ret)
 290                 return ret;
 291
 292         rkencoder->crtc_endpoint_id = ep.id;
 293
 294         return 0;
 295 }
 296
 297 /*
 298  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 299  * Should be called from the component bind stage of the drivers
 300  * to ensure that all subdrivers are probed.
 301  *
 302  * @ep: endpoint of a rockchip vop
 303  *
 304  * returns true if subdriver, false if external bridge and -ENODEV
 305  * if remote port does not contain a device.
 306  */
 307 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 308 {
 309         struct device_node *node = of_graph_get_remote_port_parent(ep);
 310         struct platform_device *pdev;
 311         struct device_driver *drv;
 312         int i;
 313
 314         if (!node)
 315                 return -ENODEV;
 316
 317         /* status disabled will prevent creation of platform-devices */
 318         if (!of_device_is_available(node)) {
 319                 of_node_put(node);
 320                 return -ENODEV;
 321         }
 322
 323         pdev = of_find_device_by_node(node);
 324         of_node_put(node);
 325
 326         /* enabled non-platform-devices can immediately return here */
 327         if (!pdev)
 328                 return false;
 329
 330         /*
 331          * All rockchip subdrivers have probed at this point, so
 332          * any device not having a driver now is an external bridge.
 333          */
 334         drv = pdev->dev.driver;
 335         if (!drv) {
 336                 platform_device_put(pdev);
 337                 return false;
 338         }
 339
 340         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 341                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 342                         platform_device_put(pdev);
 343                         return true;
 344                 }
 345         }
 346
 347         platform_device_put(pdev);
 348         return false;
 349 }
 350
 351 static void rockchip_drm_match_remove(struct device *dev)
 352 {
 353         struct device_link *link;
 354
 355         list_for_each_entry(link, &dev->links.consumers, s_node)
 356                 device_link_del(link);
 357 }
 358
 359 static struct component_match *rockchip_drm_match_add(struct device *dev)
 360 {
 361         struct component_match *match = NULL;
 362         int i;
 363
 364         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 365                 struct platform_driver *drv = rockchip_sub_drivers[i];
 366                 struct device *p = NULL, *d;
 367
 368                 do {
 369                         d = platform_find_device_by_driver(p, &drv->driver);
 370                         put_device(p);
 371                         p = d;
 372
 373                         if (!d)
 374                                 break;
 375
 376                         device_link_add(dev, d, DL_FLAG_STATELESS);
 377                         component_match_add(dev, &match, component_compare_dev, d);
 378                 } while (true);
 379         }
 380
 381         if (IS_ERR(match))
 382                 rockchip_drm_match_remove(dev);
 383
 384         return match ?: ERR_PTR(-ENODEV);
 385 }
 386
 387 static const struct component_master_ops rockchip_drm_ops = {
 388         .bind = rockchip_drm_bind,
 389         .unbind = rockchip_drm_unbind,
 390 };
 391
 392 static int rockchip_drm_platform_of_probe(struct device *dev)
 393 {
 394         struct device_node *np = dev->of_node;
 395         struct device_node *port;
 396         bool found = false;
 397         int i;
 398
 399         if (!np)
 400                 return -ENODEV;
 401
 402         for (i = 0;; i++) {
 403                 port = of_parse_phandle(np, "ports", i);
 404                 if (!port)
 405                         break;
 406
 407                 if (!of_device_is_available(port->parent)) {
 408                         of_node_put(port);
 409                         continue;
 410                 }
 411
 412                 found = true;
 413                 of_node_put(port);
 414         }
 415
 416         if (i == 0) {
 417                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 418                 return -ENODEV;
 419         }
 420
 421         if (!found) {
 422                 DRM_DEV_ERROR(dev,
 423                               "No available vop found for display-subsystem.\n");
 424                 return -ENODEV;
 425         }
 426
 427         return 0;
 428 }
 429
 430 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 431 {
 432         struct device *dev = &pdev->dev;
 433         struct component_match *match = NULL;
 434         int ret;
 435
 436         ret = rockchip_drm_platform_of_probe(dev);
 437         if (ret)
 438                 return ret;
 439
 440         match = rockchip_drm_match_add(dev);
 441         if (IS_ERR(match))
 442                 return PTR_ERR(match);
 443
 444         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 445         if (ret < 0) {
 446                 rockchip_drm_match_remove(dev);
 447                 return ret;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 454 {
 455         component_master_del(&pdev->dev, &rockchip_drm_ops);
 456
 457         rockchip_drm_match_remove(&pdev->dev);
 458
 459         return 0;
 460 }
 461
 462 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 463 {
 464         struct drm_device *drm = platform_get_drvdata(pdev);
 465
 466         if (drm)
 467                 drm_atomic_helper_shutdown(drm);
 468 }
 469
 470 static const struct of_device_id rockchip_drm_dt_ids[] = {
 471         { .compatible = "rockchip,display-subsystem", },
 472         { /* sentinel */ },
 473 };
 474 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 475
 476 static struct platform_driver rockchip_drm_platform_driver = {
 477         .probe = rockchip_drm_platform_probe,
 478         .remove = rockchip_drm_platform_remove,
 479         .shutdown = rockchip_drm_platform_shutdown,
 480         .driver = {
 481                 .name = "rockchip-drm",
 482                 .of_match_table = rockchip_drm_dt_ids,
 483                 .pm = &rockchip_drm_pm_ops,
 484         },
 485 };
 486
 487 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 488         if (IS_ENABLED(cond) && \
 489             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 490                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 491 }
 492
 493 static int __init rockchip_drm_init(void)
 494 {
 495         int ret;
 496
 497         if (drm_firmware_drivers_only())
 498                 return -ENODEV;
 499
 500         num_rockchip_sub_drivers = 0;
 501         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_ROCKCHIP_VOP);
 502         ADD_ROCKCHIP_SUB_DRIVER(vop2_platform_driver, CONFIG_ROCKCHIP_VOP2);
 503         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 504                                 CONFIG_ROCKCHIP_LVDS);
 505         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 506                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 507         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 508         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 509                                 CONFIG_ROCKCHIP_DW_HDMI);
 510         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 511                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 512         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 513         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 514                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 515
 516         ret = platform_register_drivers(rockchip_sub_drivers,
 517                                         num_rockchip_sub_drivers);
 518         if (ret)
 519                 return ret;
 520
 521         ret = platform_driver_register(&rockchip_drm_platform_driver);
 522         if (ret)
 523                 goto err_unreg_drivers;
 524
 525         return 0;
 526
 527 err_unreg_drivers:
 528         platform_unregister_drivers(rockchip_sub_drivers,
 529                                     num_rockchip_sub_drivers);
 530         return ret;
 531 }
 532
 533 static void __exit rockchip_drm_fini(void)
 534 {
 535         platform_driver_unregister(&rockchip_drm_platform_driver);
 536
 537         platform_unregister_drivers(rockchip_sub_drivers,
 538                                     num_rockchip_sub_drivers);
 539 }
 540
 541 module_init(rockchip_drm_init);
 542 module_exit(rockchip_drm_fini);
 543
 544 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 545 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 546 MODULE_LICENSE("GPL v2");