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