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