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_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_fbdev.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 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         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 118         if (IS_ERR(drm_dev))
 119                 return PTR_ERR(drm_dev);
 120
 121         dev_set_drvdata(dev, drm_dev);
 122
 123         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 124         if (!private) {
 125                 ret = -ENOMEM;
 126                 goto err_free;
 127         }
 128
 129         drm_dev->dev_private = private;
 130
 131         INIT_LIST_HEAD(&private->psr_list);
 132         mutex_init(&private->psr_list_lock);
 133
 134         ret = rockchip_drm_init_iommu(drm_dev);
 135         if (ret)
 136                 goto err_free;
 137
 138         drm_mode_config_init(drm_dev);
 139
 140         rockchip_drm_mode_config_init(drm_dev);
 141
 142         /* Try to bind all sub drivers. */
 143         ret = component_bind_all(dev, drm_dev);
 144         if (ret)
 145                 goto err_mode_config_cleanup;
 146
 147         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 148         if (ret)
 149                 goto err_unbind_all;
 150
 151         drm_mode_config_reset(drm_dev);
 152
 153         /*
 154          * enable drm irq mode.
 155          * - with irq_enabled = true, we can use the vblank feature.
 156          */
 157         drm_dev->irq_enabled = true;
 158
 159         ret = rockchip_drm_fbdev_init(drm_dev);
 160         if (ret)
 161                 goto err_unbind_all;
 162
 163         /* init kms poll for handling hpd */
 164         drm_kms_helper_poll_init(drm_dev);
 165
 166         ret = drm_dev_register(drm_dev, 0);
 167         if (ret)
 168                 goto err_kms_helper_poll_fini;
 169
 170         return 0;
 171 err_kms_helper_poll_fini:
 172         drm_kms_helper_poll_fini(drm_dev);
 173         rockchip_drm_fbdev_fini(drm_dev);
 174 err_unbind_all:
 175         component_unbind_all(dev, drm_dev);
 176 err_mode_config_cleanup:
 177         drm_mode_config_cleanup(drm_dev);
 178         rockchip_iommu_cleanup(drm_dev);
 179 err_free:
 180         drm_dev->dev_private = NULL;
 181         dev_set_drvdata(dev, NULL);
 182         drm_dev_put(drm_dev);
 183         return ret;
 184 }
 185
 186 static void rockchip_drm_unbind(struct device *dev)
 187 {
 188         struct drm_device *drm_dev = dev_get_drvdata(dev);
 189
 190         drm_dev_unregister(drm_dev);
 191
 192         rockchip_drm_fbdev_fini(drm_dev);
 193         drm_kms_helper_poll_fini(drm_dev);
 194
 195         drm_atomic_helper_shutdown(drm_dev);
 196         component_unbind_all(dev, drm_dev);
 197         drm_mode_config_cleanup(drm_dev);
 198         rockchip_iommu_cleanup(drm_dev);
 199
 200         drm_dev->dev_private = NULL;
 201         dev_set_drvdata(dev, NULL);
 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 struct drm_driver rockchip_drm_driver = {
 217         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 218         .lastclose              = drm_fb_helper_lastclose,
 219         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 220         .gem_free_object_unlocked = rockchip_gem_free_object,
 221         .dumb_create            = rockchip_gem_dumb_create,
 222         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 223         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 224         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 225         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 226         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 227         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 228         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 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  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 264  * Should be called from the component bind stage of the drivers
 265  * to ensure that all subdrivers are probed.
 266  *
 267  * @ep: endpoint of a rockchip vop
 268  *
 269  * returns true if subdriver, false if external bridge and -ENODEV
 270  * if remote port does not contain a device.
 271  */
 272 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 273 {
 274         struct device_node *node = of_graph_get_remote_port_parent(ep);
 275         struct platform_device *pdev;
 276         struct device_driver *drv;
 277         int i;
 278
 279         if (!node)
 280                 return -ENODEV;
 281
 282         /* status disabled will prevent creation of platform-devices */
 283         pdev = of_find_device_by_node(node);
 284         of_node_put(node);
 285         if (!pdev)
 286                 return -ENODEV;
 287
 288         /*
 289          * All rockchip subdrivers have probed at this point, so
 290          * any device not having a driver now is an external bridge.
 291          */
 292         drv = pdev->dev.driver;
 293         if (!drv) {
 294                 platform_device_put(pdev);
 295                 return false;
 296         }
 297
 298         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 299                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 300                         platform_device_put(pdev);
 301                         return true;
 302                 }
 303         }
 304
 305         platform_device_put(pdev);
 306         return false;
 307 }
 308
 309 static int compare_dev(struct device *dev, void *data)
 310 {
 311         return dev == (struct device *)data;
 312 }
 313
 314 static void rockchip_drm_match_remove(struct device *dev)
 315 {
 316         struct device_link *link;
 317
 318         list_for_each_entry(link, &dev->links.consumers, s_node)
 319                 device_link_del(link);
 320 }
 321
 322 static struct component_match *rockchip_drm_match_add(struct device *dev)
 323 {
 324         struct component_match *match = NULL;
 325         int i;
 326
 327         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 328                 struct platform_driver *drv = rockchip_sub_drivers[i];
 329                 struct device *p = NULL, *d;
 330
 331                 do {
 332                         d = platform_find_device_by_driver(p, &drv->driver);
 333                         put_device(p);
 334                         p = d;
 335
 336                         if (!d)
 337                                 break;
 338
 339                         device_link_add(dev, d, DL_FLAG_STATELESS);
 340                         component_match_add(dev, &match, compare_dev, d);
 341                 } while (true);
 342         }
 343
 344         if (IS_ERR(match))
 345                 rockchip_drm_match_remove(dev);
 346
 347         return match ?: ERR_PTR(-ENODEV);
 348 }
 349
 350 static const struct component_master_ops rockchip_drm_ops = {
 351         .bind = rockchip_drm_bind,
 352         .unbind = rockchip_drm_unbind,
 353 };
 354
 355 static int rockchip_drm_platform_of_probe(struct device *dev)
 356 {
 357         struct device_node *np = dev->of_node;
 358         struct device_node *port;
 359         bool found = false;
 360         int i;
 361
 362         if (!np)
 363                 return -ENODEV;
 364
 365         for (i = 0;; i++) {
 366                 struct device_node *iommu;
 367
 368                 port = of_parse_phandle(np, "ports", i);
 369                 if (!port)
 370                         break;
 371
 372                 if (!of_device_is_available(port->parent)) {
 373                         of_node_put(port);
 374                         continue;
 375                 }
 376
 377                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 378                 if (!iommu || !of_device_is_available(iommu->parent)) {
 379                         DRM_DEV_DEBUG(dev,
 380                                       "no iommu attached for %pOF, using non-iommu buffers\n",
 381                                       port->parent);
 382                         /*
 383                          * if there is a crtc not support iommu, force set all
 384                          * crtc use non-iommu buffer.
 385                          */
 386                         is_support_iommu = false;
 387                 }
 388
 389                 found = true;
 390
 391                 of_node_put(iommu);
 392                 of_node_put(port);
 393         }
 394
 395         if (i == 0) {
 396                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 397                 return -ENODEV;
 398         }
 399
 400         if (!found) {
 401                 DRM_DEV_ERROR(dev,
 402                               "No available vop found for display-subsystem.\n");
 403                 return -ENODEV;
 404         }
 405
 406         return 0;
 407 }
 408
 409 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 410 {
 411         struct device *dev = &pdev->dev;
 412         struct component_match *match = NULL;
 413         int ret;
 414
 415         ret = rockchip_drm_platform_of_probe(dev);
 416         if (ret)
 417                 return ret;
 418
 419         match = rockchip_drm_match_add(dev);
 420         if (IS_ERR(match))
 421                 return PTR_ERR(match);
 422
 423         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 424         if (ret < 0) {
 425                 rockchip_drm_match_remove(dev);
 426                 return ret;
 427         }
 428
 429         return 0;
 430 }
 431
 432 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 433 {
 434         component_master_del(&pdev->dev, &rockchip_drm_ops);
 435
 436         rockchip_drm_match_remove(&pdev->dev);
 437
 438         return 0;
 439 }
 440
 441 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 442 {
 443         struct drm_device *drm = platform_get_drvdata(pdev);
 444
 445         if (drm)
 446                 drm_atomic_helper_shutdown(drm);
 447 }
 448
 449 static const struct of_device_id rockchip_drm_dt_ids[] = {
 450         { .compatible = "rockchip,display-subsystem", },
 451         { /* sentinel */ },
 452 };
 453 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 454
 455 static struct platform_driver rockchip_drm_platform_driver = {
 456         .probe = rockchip_drm_platform_probe,
 457         .remove = rockchip_drm_platform_remove,
 458         .shutdown = rockchip_drm_platform_shutdown,
 459         .driver = {
 460                 .name = "rockchip-drm",
 461                 .of_match_table = rockchip_drm_dt_ids,
 462                 .pm = &rockchip_drm_pm_ops,
 463         },
 464 };
 465
 466 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 467         if (IS_ENABLED(cond) && \
 468             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 469                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 470 }
 471
 472 static int __init rockchip_drm_init(void)
 473 {
 474         int ret;
 475
 476         num_rockchip_sub_drivers = 0;
 477         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
 478         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 479                                 CONFIG_ROCKCHIP_LVDS);
 480         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 481                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 482         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 483         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 484                                 CONFIG_ROCKCHIP_DW_HDMI);
 485         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 486                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 487         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 488         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 489                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 490
 491         ret = platform_register_drivers(rockchip_sub_drivers,
 492                                         num_rockchip_sub_drivers);
 493         if (ret)
 494                 return ret;
 495
 496         ret = platform_driver_register(&rockchip_drm_platform_driver);
 497         if (ret)
 498                 goto err_unreg_drivers;
 499
 500         return 0;
 501
 502 err_unreg_drivers:
 503         platform_unregister_drivers(rockchip_sub_drivers,
 504                                     num_rockchip_sub_drivers);
 505         return ret;
 506 }
 507
 508 static void __exit rockchip_drm_fini(void)
 509 {
 510         platform_driver_unregister(&rockchip_drm_platform_driver);
 511
 512         platform_unregister_drivers(rockchip_sub_drivers,
 513                                     num_rockchip_sub_drivers);
 514 }
 515
 516 module_init(rockchip_drm_init);
 517 module_exit(rockchip_drm_fini);
 518
 519 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 520 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 521 MODULE_LICENSE("GPL v2");