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 const 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 const struct drm_driver rockchip_drm_driver = {
 213         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 214         .lastclose              = drm_fb_helper_lastclose,
 215         .dumb_create            = rockchip_gem_dumb_create,
 216         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 217         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 218         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 219         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 220         .fops                   = &rockchip_drm_driver_fops,
 221         .name   = DRIVER_NAME,
 222         .desc   = DRIVER_DESC,
 223         .date   = DRIVER_DATE,
 224         .major  = DRIVER_MAJOR,
 225         .minor  = DRIVER_MINOR,
 226 };
 227
 228 #ifdef CONFIG_PM_SLEEP
 229 static int rockchip_drm_sys_suspend(struct device *dev)
 230 {
 231         struct drm_device *drm = dev_get_drvdata(dev);
 232
 233         return drm_mode_config_helper_suspend(drm);
 234 }
 235
 236 static int rockchip_drm_sys_resume(struct device *dev)
 237 {
 238         struct drm_device *drm = dev_get_drvdata(dev);
 239
 240         return drm_mode_config_helper_resume(drm);
 241 }
 242 #endif
 243
 244 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 245         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 246                                 rockchip_drm_sys_resume)
 247 };
 248
 249 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 250 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 251 static int num_rockchip_sub_drivers;
 252
 253 /*
 254  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 255  * Should be called from the component bind stage of the drivers
 256  * to ensure that all subdrivers are probed.
 257  *
 258  * @ep: endpoint of a rockchip vop
 259  *
 260  * returns true if subdriver, false if external bridge and -ENODEV
 261  * if remote port does not contain a device.
 262  */
 263 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 264 {
 265         struct device_node *node = of_graph_get_remote_port_parent(ep);
 266         struct platform_device *pdev;
 267         struct device_driver *drv;
 268         int i;
 269
 270         if (!node)
 271                 return -ENODEV;
 272
 273         /* status disabled will prevent creation of platform-devices */
 274         pdev = of_find_device_by_node(node);
 275         of_node_put(node);
 276         if (!pdev)
 277                 return -ENODEV;
 278
 279         /*
 280          * All rockchip subdrivers have probed at this point, so
 281          * any device not having a driver now is an external bridge.
 282          */
 283         drv = pdev->dev.driver;
 284         if (!drv) {
 285                 platform_device_put(pdev);
 286                 return false;
 287         }
 288
 289         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 290                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 291                         platform_device_put(pdev);
 292                         return true;
 293                 }
 294         }
 295
 296         platform_device_put(pdev);
 297         return false;
 298 }
 299
 300 static int compare_dev(struct device *dev, void *data)
 301 {
 302         return dev == (struct device *)data;
 303 }
 304
 305 static void rockchip_drm_match_remove(struct device *dev)
 306 {
 307         struct device_link *link;
 308
 309         list_for_each_entry(link, &dev->links.consumers, s_node)
 310                 device_link_del(link);
 311 }
 312
 313 static struct component_match *rockchip_drm_match_add(struct device *dev)
 314 {
 315         struct component_match *match = NULL;
 316         int i;
 317
 318         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 319                 struct platform_driver *drv = rockchip_sub_drivers[i];
 320                 struct device *p = NULL, *d;
 321
 322                 do {
 323                         d = platform_find_device_by_driver(p, &drv->driver);
 324                         put_device(p);
 325                         p = d;
 326
 327                         if (!d)
 328                                 break;
 329
 330                         device_link_add(dev, d, DL_FLAG_STATELESS);
 331                         component_match_add(dev, &match, compare_dev, d);
 332                 } while (true);
 333         }
 334
 335         if (IS_ERR(match))
 336                 rockchip_drm_match_remove(dev);
 337
 338         return match ?: ERR_PTR(-ENODEV);
 339 }
 340
 341 static const struct component_master_ops rockchip_drm_ops = {
 342         .bind = rockchip_drm_bind,
 343         .unbind = rockchip_drm_unbind,
 344 };
 345
 346 static int rockchip_drm_platform_of_probe(struct device *dev)
 347 {
 348         struct device_node *np = dev->of_node;
 349         struct device_node *port;
 350         bool found = false;
 351         int i;
 352
 353         if (!np)
 354                 return -ENODEV;
 355
 356         for (i = 0;; i++) {
 357                 struct device_node *iommu;
 358
 359                 port = of_parse_phandle(np, "ports", i);
 360                 if (!port)
 361                         break;
 362
 363                 if (!of_device_is_available(port->parent)) {
 364                         of_node_put(port);
 365                         continue;
 366                 }
 367
 368                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 369                 if (!iommu || !of_device_is_available(iommu->parent)) {
 370                         DRM_DEV_DEBUG(dev,
 371                                       "no iommu attached for %pOF, using non-iommu buffers\n",
 372                                       port->parent);
 373                         /*
 374                          * if there is a crtc not support iommu, force set all
 375                          * crtc use non-iommu buffer.
 376                          */
 377                         is_support_iommu = false;
 378                 }
 379
 380                 found = true;
 381
 382                 of_node_put(iommu);
 383                 of_node_put(port);
 384         }
 385
 386         if (i == 0) {
 387                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 388                 return -ENODEV;
 389         }
 390
 391         if (!found) {
 392                 DRM_DEV_ERROR(dev,
 393                               "No available vop found for display-subsystem.\n");
 394                 return -ENODEV;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 401 {
 402         struct device *dev = &pdev->dev;
 403         struct component_match *match = NULL;
 404         int ret;
 405
 406         ret = rockchip_drm_platform_of_probe(dev);
 407         if (ret)
 408                 return ret;
 409
 410         match = rockchip_drm_match_add(dev);
 411         if (IS_ERR(match))
 412                 return PTR_ERR(match);
 413
 414         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 415         if (ret < 0) {
 416                 rockchip_drm_match_remove(dev);
 417                 return ret;
 418         }
 419
 420         return 0;
 421 }
 422
 423 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 424 {
 425         component_master_del(&pdev->dev, &rockchip_drm_ops);
 426
 427         rockchip_drm_match_remove(&pdev->dev);
 428
 429         return 0;
 430 }
 431
 432 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 433 {
 434         struct drm_device *drm = platform_get_drvdata(pdev);
 435
 436         if (drm)
 437                 drm_atomic_helper_shutdown(drm);
 438 }
 439
 440 static const struct of_device_id rockchip_drm_dt_ids[] = {
 441         { .compatible = "rockchip,display-subsystem", },
 442         { /* sentinel */ },
 443 };
 444 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 445
 446 static struct platform_driver rockchip_drm_platform_driver = {
 447         .probe = rockchip_drm_platform_probe,
 448         .remove = rockchip_drm_platform_remove,
 449         .shutdown = rockchip_drm_platform_shutdown,
 450         .driver = {
 451                 .name = "rockchip-drm",
 452                 .of_match_table = rockchip_drm_dt_ids,
 453                 .pm = &rockchip_drm_pm_ops,
 454         },
 455 };
 456
 457 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 458         if (IS_ENABLED(cond) && \
 459             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 460                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 461 }
 462
 463 static int __init rockchip_drm_init(void)
 464 {
 465         int ret;
 466
 467         num_rockchip_sub_drivers = 0;
 468         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
 469         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 470                                 CONFIG_ROCKCHIP_LVDS);
 471         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 472                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 473         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 474         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 475                                 CONFIG_ROCKCHIP_DW_HDMI);
 476         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 477                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 478         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 479         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 480                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 481
 482         ret = platform_register_drivers(rockchip_sub_drivers,
 483                                         num_rockchip_sub_drivers);
 484         if (ret)
 485                 return ret;
 486
 487         ret = platform_driver_register(&rockchip_drm_platform_driver);
 488         if (ret)
 489                 goto err_unreg_drivers;
 490
 491         return 0;
 492
 493 err_unreg_drivers:
 494         platform_unregister_drivers(rockchip_sub_drivers,
 495                                     num_rockchip_sub_drivers);
 496         return ret;
 497 }
 498
 499 static void __exit rockchip_drm_fini(void)
 500 {
 501         platform_driver_unregister(&rockchip_drm_platform_driver);
 502
 503         platform_unregister_drivers(rockchip_sub_drivers,
 504                                     num_rockchip_sub_drivers);
 505 }
 506
 507 module_init(rockchip_drm_init);
 508 module_exit(rockchip_drm_fini);
 509
 510 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 511 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 512 MODULE_LICENSE("GPL v2");