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