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_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         /*
 166          * enable drm irq mode.
 167          * - with irq_enabled = true, we can use the vblank feature.
 168          */
 169         drm_dev->irq_enabled = true;
 170
 171         ret = rockchip_drm_fbdev_init(drm_dev);
 172         if (ret)
 173                 goto err_unbind_all;
 174
 175         /* init kms poll for handling hpd */
 176         drm_kms_helper_poll_init(drm_dev);
 177
 178         ret = drm_dev_register(drm_dev, 0);
 179         if (ret)
 180                 goto err_kms_helper_poll_fini;
 181
 182         return 0;
 183 err_kms_helper_poll_fini:
 184         drm_kms_helper_poll_fini(drm_dev);
 185         rockchip_drm_fbdev_fini(drm_dev);
 186 err_unbind_all:
 187         component_unbind_all(dev, drm_dev);
 188 err_iommu_cleanup:
 189         rockchip_iommu_cleanup(drm_dev);
 190 err_free:
 191         drm_dev_put(drm_dev);
 192         return ret;
 193 }
 194
 195 static void rockchip_drm_unbind(struct device *dev)
 196 {
 197         struct drm_device *drm_dev = dev_get_drvdata(dev);
 198
 199         drm_dev_unregister(drm_dev);
 200
 201         rockchip_drm_fbdev_fini(drm_dev);
 202         drm_kms_helper_poll_fini(drm_dev);
 203
 204         drm_atomic_helper_shutdown(drm_dev);
 205         component_unbind_all(dev, drm_dev);
 206         rockchip_iommu_cleanup(drm_dev);
 207
 208         drm_dev_put(drm_dev);
 209 }
 210
 211 static const struct file_operations rockchip_drm_driver_fops = {
 212         .owner = THIS_MODULE,
 213         .open = drm_open,
 214         .mmap = rockchip_gem_mmap,
 215         .poll = drm_poll,
 216         .read = drm_read,
 217         .unlocked_ioctl = drm_ioctl,
 218         .compat_ioctl = drm_compat_ioctl,
 219         .release = drm_release,
 220 };
 221
 222 static const struct drm_driver rockchip_drm_driver = {
 223         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 224         .lastclose              = drm_fb_helper_lastclose,
 225         .dumb_create            = rockchip_gem_dumb_create,
 226         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 227         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 228         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 229         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 230         .fops                   = &rockchip_drm_driver_fops,
 231         .name   = DRIVER_NAME,
 232         .desc   = DRIVER_DESC,
 233         .date   = DRIVER_DATE,
 234         .major  = DRIVER_MAJOR,
 235         .minor  = DRIVER_MINOR,
 236 };
 237
 238 #ifdef CONFIG_PM_SLEEP
 239 static int rockchip_drm_sys_suspend(struct device *dev)
 240 {
 241         struct drm_device *drm = dev_get_drvdata(dev);
 242
 243         return drm_mode_config_helper_suspend(drm);
 244 }
 245
 246 static int rockchip_drm_sys_resume(struct device *dev)
 247 {
 248         struct drm_device *drm = dev_get_drvdata(dev);
 249
 250         return drm_mode_config_helper_resume(drm);
 251 }
 252 #endif
 253
 254 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 255         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 256                                 rockchip_drm_sys_resume)
 257 };
 258
 259 #define MAX_ROCKCHIP_SUB_DRIVERS 16
 260 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];
 261 static int num_rockchip_sub_drivers;
 262
 263 /*
 264  * Check if a vop endpoint is leading to a rockchip subdriver or bridge.
 265  * Should be called from the component bind stage of the drivers
 266  * to ensure that all subdrivers are probed.
 267  *
 268  * @ep: endpoint of a rockchip vop
 269  *
 270  * returns true if subdriver, false if external bridge and -ENODEV
 271  * if remote port does not contain a device.
 272  */
 273 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
 274 {
 275         struct device_node *node = of_graph_get_remote_port_parent(ep);
 276         struct platform_device *pdev;
 277         struct device_driver *drv;
 278         int i;
 279
 280         if (!node)
 281                 return -ENODEV;
 282
 283         /* status disabled will prevent creation of platform-devices */
 284         pdev = of_find_device_by_node(node);
 285         of_node_put(node);
 286         if (!pdev)
 287                 return -ENODEV;
 288
 289         /*
 290          * All rockchip subdrivers have probed at this point, so
 291          * any device not having a driver now is an external bridge.
 292          */
 293         drv = pdev->dev.driver;
 294         if (!drv) {
 295                 platform_device_put(pdev);
 296                 return false;
 297         }
 298
 299         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 300                 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) {
 301                         platform_device_put(pdev);
 302                         return true;
 303                 }
 304         }
 305
 306         platform_device_put(pdev);
 307         return false;
 308 }
 309
 310 static int compare_dev(struct device *dev, void *data)
 311 {
 312         return dev == (struct device *)data;
 313 }
 314
 315 static void rockchip_drm_match_remove(struct device *dev)
 316 {
 317         struct device_link *link;
 318
 319         list_for_each_entry(link, &dev->links.consumers, s_node)
 320                 device_link_del(link);
 321 }
 322
 323 static struct component_match *rockchip_drm_match_add(struct device *dev)
 324 {
 325         struct component_match *match = NULL;
 326         int i;
 327
 328         for (i = 0; i < num_rockchip_sub_drivers; i++) {
 329                 struct platform_driver *drv = rockchip_sub_drivers[i];
 330                 struct device *p = NULL, *d;
 331
 332                 do {
 333                         d = platform_find_device_by_driver(p, &drv->driver);
 334                         put_device(p);
 335                         p = d;
 336
 337                         if (!d)
 338                                 break;
 339
 340                         device_link_add(dev, d, DL_FLAG_STATELESS);
 341                         component_match_add(dev, &match, compare_dev, d);
 342                 } while (true);
 343         }
 344
 345         if (IS_ERR(match))
 346                 rockchip_drm_match_remove(dev);
 347
 348         return match ?: ERR_PTR(-ENODEV);
 349 }
 350
 351 static const struct component_master_ops rockchip_drm_ops = {
 352         .bind = rockchip_drm_bind,
 353         .unbind = rockchip_drm_unbind,
 354 };
 355
 356 static int rockchip_drm_platform_of_probe(struct device *dev)
 357 {
 358         struct device_node *np = dev->of_node;
 359         struct device_node *port;
 360         bool found = false;
 361         int i;
 362
 363         if (!np)
 364                 return -ENODEV;
 365
 366         for (i = 0;; i++) {
 367                 struct device_node *iommu;
 368
 369                 port = of_parse_phandle(np, "ports", i);
 370                 if (!port)
 371                         break;
 372
 373                 if (!of_device_is_available(port->parent)) {
 374                         of_node_put(port);
 375                         continue;
 376                 }
 377
 378                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 379                 if (!iommu || !of_device_is_available(iommu->parent)) {
 380                         DRM_DEV_DEBUG(dev,
 381                                       "no iommu attached for %pOF, using non-iommu buffers\n",
 382                                       port->parent);
 383                         /*
 384                          * if there is a crtc not support iommu, force set all
 385                          * crtc use non-iommu buffer.
 386                          */
 387                         is_support_iommu = false;
 388                 }
 389
 390                 found = true;
 391
 392                 of_node_put(iommu);
 393                 of_node_put(port);
 394         }
 395
 396         if (i == 0) {
 397                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 398                 return -ENODEV;
 399         }
 400
 401         if (!found) {
 402                 DRM_DEV_ERROR(dev,
 403                               "No available vop found for display-subsystem.\n");
 404                 return -ENODEV;
 405         }
 406
 407         return 0;
 408 }
 409
 410 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 411 {
 412         struct device *dev = &pdev->dev;
 413         struct component_match *match = NULL;
 414         int ret;
 415
 416         ret = rockchip_drm_platform_of_probe(dev);
 417         if (ret)
 418                 return ret;
 419
 420         match = rockchip_drm_match_add(dev);
 421         if (IS_ERR(match))
 422                 return PTR_ERR(match);
 423
 424         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 425         if (ret < 0) {
 426                 rockchip_drm_match_remove(dev);
 427                 return ret;
 428         }
 429
 430         return 0;
 431 }
 432
 433 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 434 {
 435         component_master_del(&pdev->dev, &rockchip_drm_ops);
 436
 437         rockchip_drm_match_remove(&pdev->dev);
 438
 439         return 0;
 440 }
 441
 442 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 443 {
 444         struct drm_device *drm = platform_get_drvdata(pdev);
 445
 446         if (drm)
 447                 drm_atomic_helper_shutdown(drm);
 448 }
 449
 450 static const struct of_device_id rockchip_drm_dt_ids[] = {
 451         { .compatible = "rockchip,display-subsystem", },
 452         { /* sentinel */ },
 453 };
 454 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 455
 456 static struct platform_driver rockchip_drm_platform_driver = {
 457         .probe = rockchip_drm_platform_probe,
 458         .remove = rockchip_drm_platform_remove,
 459         .shutdown = rockchip_drm_platform_shutdown,
 460         .driver = {
 461                 .name = "rockchip-drm",
 462                 .of_match_table = rockchip_drm_dt_ids,
 463                 .pm = &rockchip_drm_pm_ops,
 464         },
 465 };
 466
 467 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 468         if (IS_ENABLED(cond) && \
 469             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 470                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 471 }
 472
 473 static int __init rockchip_drm_init(void)
 474 {
 475         int ret;
 476
 477         num_rockchip_sub_drivers = 0;
 478         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
 479         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 480                                 CONFIG_ROCKCHIP_LVDS);
 481         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 482                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 483         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 484         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 485                                 CONFIG_ROCKCHIP_DW_HDMI);
 486         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 487                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 488         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 489         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 490                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 491
 492         ret = platform_register_drivers(rockchip_sub_drivers,
 493                                         num_rockchip_sub_drivers);
 494         if (ret)
 495                 return ret;
 496
 497         ret = platform_driver_register(&rockchip_drm_platform_driver);
 498         if (ret)
 499                 goto err_unreg_drivers;
 500
 501         return 0;
 502
 503 err_unreg_drivers:
 504         platform_unregister_drivers(rockchip_sub_drivers,
 505                                     num_rockchip_sub_drivers);
 506         return ret;
 507 }
 508
 509 static void __exit rockchip_drm_fini(void)
 510 {
 511         platform_driver_unregister(&rockchip_drm_platform_driver);
 512
 513         platform_unregister_drivers(rockchip_sub_drivers,
 514                                     num_rockchip_sub_drivers);
 515 }
 516
 517 module_init(rockchip_drm_init);
 518 module_exit(rockchip_drm_fini);
 519
 520 MODULE_AUTHOR("Mark Yao <[email protected]>");
 521 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 522 MODULE_LICENSE("GPL v2");