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 <[email protected]>
   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         ret = drmm_mode_config_init(drm_dev);
 139         if (ret)
 140                 goto err_iommu_cleanup;
 141
 142         rockchip_drm_mode_config_init(drm_dev);
 143
 144         /* Try to bind all sub drivers. */
 145         ret = component_bind_all(dev, drm_dev);
 146         if (ret)
 147                 goto err_iommu_cleanup;
 148
 149         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 150         if (ret)
 151                 goto err_unbind_all;
 152
 153         drm_mode_config_reset(drm_dev);
 154
 155         /*
 156          * enable drm irq mode.
 157          * - with irq_enabled = true, we can use the vblank feature.
 158          */
 159         drm_dev->irq_enabled = true;
 160
 161         ret = rockchip_drm_fbdev_init(drm_dev);
 162         if (ret)
 163                 goto err_unbind_all;
 164
 165         /* init kms poll for handling hpd */
 166         drm_kms_helper_poll_init(drm_dev);
 167
 168         ret = drm_dev_register(drm_dev, 0);
 169         if (ret)
 170                 goto err_kms_helper_poll_fini;
 171
 172         return 0;
 173 err_kms_helper_poll_fini:
 174         drm_kms_helper_poll_fini(drm_dev);
 175         rockchip_drm_fbdev_fini(drm_dev);
 176 err_unbind_all:
 177         component_unbind_all(dev, drm_dev);
 178 err_iommu_cleanup:
 179         rockchip_iommu_cleanup(drm_dev);
 180 err_free:
 181         drm_dev_put(drm_dev);
 182         return ret;
 183 }
 184
 185 static void rockchip_drm_unbind(struct device *dev)
 186 {
 187         struct drm_device *drm_dev = dev_get_drvdata(dev);
 188
 189         drm_dev_unregister(drm_dev);
 190
 191         rockchip_drm_fbdev_fini(drm_dev);
 192         drm_kms_helper_poll_fini(drm_dev);
 193
 194         drm_atomic_helper_shutdown(drm_dev);
 195         component_unbind_all(dev, drm_dev);
 196         rockchip_iommu_cleanup(drm_dev);
 197
 198         drm_dev_put(drm_dev);
 199 }
 200
 201 static const struct file_operations rockchip_drm_driver_fops = {
 202         .owner = THIS_MODULE,
 203         .open = drm_open,
 204         .mmap = rockchip_gem_mmap,
 205         .poll = drm_poll,
 206         .read = drm_read,
 207         .unlocked_ioctl = drm_ioctl,
 208         .compat_ioctl = drm_compat_ioctl,
 209         .release = drm_release,
 210 };
 211
 212 static struct drm_driver rockchip_drm_driver = {
 213         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 214         .lastclose              = drm_fb_helper_lastclose,
 215         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 216         .gem_free_object_unlocked = rockchip_gem_free_object,
 217         .dumb_create            = rockchip_gem_dumb_create,
 218         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 219         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 220         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 221         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 222         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 223         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 224         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 225         .fops                   = &rockchip_drm_driver_fops,
 226         .name   = DRIVER_NAME,
 227         .desc   = DRIVER_DESC,
 228         .date   = DRIVER_DATE,
 229         .major  = DRIVER_MAJOR,
 230         .minor  = DRIVER_MINOR,
 231 };
 232
 233 #ifdef CONFIG_PM_SLEEP
 234 static int rockchip_drm_sys_suspend(struct device *dev)
 235 {
 236         struct drm_device *drm = dev_get_drvdata(dev);
 237
 238         return drm_mode_config_helper_suspend(drm);
 239 }
 240
 241 static int rockchip_drm_sys_resume(struct device *dev)
 242 {
 243         struct drm_device *drm = dev_get_drvdata(dev);
 244
 245         return drm_mode_config_helper_resume(drm);
 246 }
 247 #endif
 248
 249 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 250         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 251                                 rockchip_drm_sys_resume)
 252 };
 253
 254 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 255 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 256 static int num_rockchip_sub_drivers;
 257
 258 /*
 259  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 260  * Should be called from the component bind stage of the drivers
 261  * to ensure that all subdrivers are probed.
 262  *
 263  * @ep: endpoint of a rockchip vop
 264  *
 265  * returns true if subdriver, false if external bridge and -ENODEV
 266  * if remote port does not contain a device.
 267  */
 268 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 269 {
 270         struct device_node *node = of_graph_get_remote_port_parent(ep);
 271         struct platform_device *pdev;
 272         struct device_driver *drv;
 273         int i;
 274
 275         if (!node)
 276                 return -ENODEV;
 277
 278         /* status disabled will prevent creation of platform-devices */
 279         pdev = of_find_device_by_node(node);
 280         of_node_put(node);
 281         if (!pdev)
 282                 return -ENODEV;
 283
 284         /*
 285          * All rockchip subdrivers have probed at this point, so
 286          * any device not having a driver now is an external bridge.
 287          */
 288         drv = pdev->dev.driver;
 289         if (!drv) {
 290                 platform_device_put(pdev);
 291                 return false;
 292         }
 293
 294         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 295                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 296                         platform_device_put(pdev);
 297                         return true;
 298                 }
 299         }
 300
 301         platform_device_put(pdev);
 302         return false;
 303 }
 304
 305 static int compare_dev(struct device *dev, void *data)
 306 {
 307         return dev == (struct device *)data;
 308 }
 309
 310 static void rockchip_drm_match_remove(struct device *dev)
 311 {
 312         struct device_link *link;
 313
 314         list_for_each_entry(link, &dev->links.consumers, s_node)
 315                 device_link_del(link);
 316 }
 317
 318 static struct component_match *rockchip_drm_match_add(struct device *dev)
 319 {
 320         struct component_match *match = NULL;
 321         int i;
 322
 323         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 324                 struct platform_driver *drv = rockchip_sub_drivers[i];
 325                 struct device *p = NULL, *d;
 326
 327                 do {
 328                         d = platform_find_device_by_driver(p, &drv->driver);
 329                         put_device(p);
 330                         p = d;
 331
 332                         if (!d)
 333                                 break;
 334
 335                         device_link_add(dev, d, DL_FLAG_STATELESS);
 336                         component_match_add(dev, &match, compare_dev, d);
 337                 } while (true);
 338         }
 339
 340         if (IS_ERR(match))
 341                 rockchip_drm_match_remove(dev);
 342
 343         return match ?: ERR_PTR(-ENODEV);
 344 }
 345
 346 static const struct component_master_ops rockchip_drm_ops = {
 347         .bind = rockchip_drm_bind,
 348         .unbind = rockchip_drm_unbind,
 349 };
 350
 351 static int rockchip_drm_platform_of_probe(struct device *dev)
 352 {
 353         struct device_node *np = dev->of_node;
 354         struct device_node *port;
 355         bool found = false;
 356         int i;
 357
 358         if (!np)
 359                 return -ENODEV;
 360
 361         for (i = 0;; i++) {
 362                 struct device_node *iommu;
 363
 364                 port = of_parse_phandle(np, "ports", i);
 365                 if (!port)
 366                         break;
 367
 368                 if (!of_device_is_available(port->parent)) {
 369                         of_node_put(port);
 370                         continue;
 371                 }
 372
 373                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 374                 if (!iommu || !of_device_is_available(iommu->parent)) {
 375                         DRM_DEV_DEBUG(dev,
 376                                       "no iommu attached for %pOF, using non-iommu buffers\n",
 377                                       port->parent);
 378                         /*
 379                          * if there is a crtc not support iommu, force set all
 380                          * crtc use non-iommu buffer.
 381                          */
 382                         is_support_iommu = false;
 383                 }
 384
 385                 found = true;
 386
 387                 of_node_put(iommu);
 388                 of_node_put(port);
 389         }
 390
 391         if (i == 0) {
 392                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 393                 return -ENODEV;
 394         }
 395
 396         if (!found) {
 397                 DRM_DEV_ERROR(dev,
 398                               "No available vop found for display-subsystem.\n");
 399                 return -ENODEV;
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 406 {
 407         struct device *dev = &pdev->dev;
 408         struct component_match *match = NULL;
 409         int ret;
 410
 411         ret = rockchip_drm_platform_of_probe(dev);
 412         if (ret)
 413                 return ret;
 414
 415         match = rockchip_drm_match_add(dev);
 416         if (IS_ERR(match))
 417                 return PTR_ERR(match);
 418
 419         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 420         if (ret < 0) {
 421                 rockchip_drm_match_remove(dev);
 422                 return ret;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 429 {
 430         component_master_del(&pdev->dev, &rockchip_drm_ops);
 431
 432         rockchip_drm_match_remove(&pdev->dev);
 433
 434         return 0;
 435 }
 436
 437 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 438 {
 439         struct drm_device *drm = platform_get_drvdata(pdev);
 440
 441         if (drm)
 442                 drm_atomic_helper_shutdown(drm);
 443 }
 444
 445 static const struct of_device_id rockchip_drm_dt_ids[] = {
 446         { .compatible = "rockchip,display-subsystem", },
 447         { /* sentinel */ },
 448 };
 449 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 450
 451 static struct platform_driver rockchip_drm_platform_driver = {
 452         .probe = rockchip_drm_platform_probe,
 453         .remove = rockchip_drm_platform_remove,
 454         .shutdown = rockchip_drm_platform_shutdown,
 455         .driver = {
 456                 .name = "rockchip-drm",
 457                 .of_match_table = rockchip_drm_dt_ids,
 458                 .pm = &rockchip_drm_pm_ops,
 459         },
 460 };
 461
 462 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 463         if (IS_ENABLED(cond) && \
 464             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 465                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 466 }
 467
 468 static int __init rockchip_drm_init(void)
 469 {
 470         int ret;
 471
 472         num_rockchip_sub_drivers = 0;
 473         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
 474         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 475                                 CONFIG_ROCKCHIP_LVDS);
 476         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 477                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 478         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 479         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 480                                 CONFIG_ROCKCHIP_DW_HDMI);
 481         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 482                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 483         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 484         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 485                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 486
 487         ret = platform_register_drivers(rockchip_sub_drivers,
 488                                         num_rockchip_sub_drivers);
 489         if (ret)
 490                 return ret;
 491
 492         ret = platform_driver_register(&rockchip_drm_platform_driver);
 493         if (ret)
 494                 goto err_unreg_drivers;
 495
 496         return 0;
 497
 498 err_unreg_drivers:
 499         platform_unregister_drivers(rockchip_sub_drivers,
 500                                     num_rockchip_sub_drivers);
 501         return ret;
 502 }
 503
 504 static void __exit rockchip_drm_fini(void)
 505 {
 506         platform_driver_unregister(&rockchip_drm_platform_driver);
 507
 508         platform_unregister_drivers(rockchip_sub_drivers,
 509                                     num_rockchip_sub_drivers);
 510 }
 511
 512 module_init(rockchip_drm_init);
 513 module_exit(rockchip_drm_fini);
 514
 515 MODULE_AUTHOR("Mark Yao <[email protected]>");
 516 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 517 MODULE_LICENSE("GPL v2");