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