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 <drm/drmP.h>
  10 #include <drm/drm_fb_helper.h>
  11 #include <drm/drm_gem_cma_helper.h>
  12 #include <drm/drm_of.h>
  13 #include <drm/drm_probe_helper.h>
  14 #include <linux/dma-mapping.h>
  15 #include <linux/dma-iommu.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/module.h>
  18 #include <linux/of_graph.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/component.h>
  21 #include <linux/console.h>
  22 #include <linux/iommu.h>
  23
  24 #include "rockchip_drm_drv.h"
  25 #include "rockchip_drm_fb.h"
  26 #include "rockchip_drm_fbdev.h"
  27 #include "rockchip_drm_gem.h"
  28
  29 #define DRIVER_NAME     "rockchip"
  30 #define DRIVER_DESC     "RockChip Soc DRM"
  31 #define DRIVER_DATE     "20140818"
  32 #define DRIVER_MAJOR    1
  33 #define DRIVER_MINOR    0
  34
  35 static bool is_support_iommu = true;
  36 static struct drm_driver rockchip_drm_driver;
  37
  38 /*
  39  * Attach a (component) device to the shared drm dma mapping from master drm
  40  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  41  * mapping.
  42  */
  43 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  44                                    struct device *dev)
  45 {
  46         struct rockchip_drm_private *private = drm_dev->dev_private;
  47         int ret;
  48
  49         if (!is_support_iommu)
  50                 return 0;
  51
  52         ret = iommu_attach_device(private->domain, dev);
  53         if (ret) {
  54                 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  62                                     struct device *dev)
  63 {
  64         struct rockchip_drm_private *private = drm_dev->dev_private;
  65         struct iommu_domain *domain = private->domain;
  66
  67         if (!is_support_iommu)
  68                 return;
  69
  70         iommu_detach_device(domain, dev);
  71 }
  72
  73 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
  74 {
  75         struct rockchip_drm_private *private = drm_dev->dev_private;
  76         struct iommu_domain_geometry *geometry;
  77         u64 start, end;
  78
  79         if (!is_support_iommu)
  80                 return 0;
  81
  82         private->domain = iommu_domain_alloc(&platform_bus_type);
  83         if (!private->domain)
  84                 return -ENOMEM;
  85
  86         geometry = &private->domain->geometry;
  87         start = geometry->aperture_start;
  88         end = geometry->aperture_end;
  89
  90         DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
  91                   start, end);
  92         drm_mm_init(&private->mm, start, end - start + 1);
  93         mutex_init(&private->mm_lock);
  94
  95         return 0;
  96 }
  97
  98 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
  99 {
 100         struct rockchip_drm_private *private = drm_dev->dev_private;
 101
 102         if (!is_support_iommu)
 103                 return;
 104
 105         drm_mm_takedown(&private->mm);
 106         iommu_domain_free(private->domain);
 107 }
 108
 109 static int rockchip_drm_bind(struct device *dev)
 110 {
 111         struct drm_device *drm_dev;
 112         struct rockchip_drm_private *private;
 113         int ret;
 114
 115         drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
 116         if (IS_ERR(drm_dev))
 117                 return PTR_ERR(drm_dev);
 118
 119         dev_set_drvdata(dev, drm_dev);
 120
 121         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 122         if (!private) {
 123                 ret = -ENOMEM;
 124                 goto err_free;
 125         }
 126
 127         drm_dev->dev_private = private;
 128
 129         INIT_LIST_HEAD(&private->psr_list);
 130         mutex_init(&private->psr_list_lock);
 131
 132         ret = rockchip_drm_init_iommu(drm_dev);
 133         if (ret)
 134                 goto err_free;
 135
 136         drm_mode_config_init(drm_dev);
 137
 138         rockchip_drm_mode_config_init(drm_dev);
 139
 140         /* Try to bind all sub drivers. */
 141         ret = component_bind_all(dev, drm_dev);
 142         if (ret)
 143                 goto err_mode_config_cleanup;
 144
 145         ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
 146         if (ret)
 147                 goto err_unbind_all;
 148
 149         drm_mode_config_reset(drm_dev);
 150
 151         /*
 152          * enable drm irq mode.
 153          * - with irq_enabled = true, we can use the vblank feature.
 154          */
 155         drm_dev->irq_enabled = true;
 156
 157         ret = rockchip_drm_fbdev_init(drm_dev);
 158         if (ret)
 159                 goto err_unbind_all;
 160
 161         /* init kms poll for handling hpd */
 162         drm_kms_helper_poll_init(drm_dev);
 163
 164         ret = drm_dev_register(drm_dev, 0);
 165         if (ret)
 166                 goto err_kms_helper_poll_fini;
 167
 168         return 0;
 169 err_kms_helper_poll_fini:
 170         drm_kms_helper_poll_fini(drm_dev);
 171         rockchip_drm_fbdev_fini(drm_dev);
 172 err_unbind_all:
 173         component_unbind_all(dev, drm_dev);
 174 err_mode_config_cleanup:
 175         drm_mode_config_cleanup(drm_dev);
 176         rockchip_iommu_cleanup(drm_dev);
 177 err_free:
 178         drm_dev->dev_private = NULL;
 179         dev_set_drvdata(dev, NULL);
 180         drm_dev_put(drm_dev);
 181         return ret;
 182 }
 183
 184 static void rockchip_drm_unbind(struct device *dev)
 185 {
 186         struct drm_device *drm_dev = dev_get_drvdata(dev);
 187
 188         drm_dev_unregister(drm_dev);
 189
 190         rockchip_drm_fbdev_fini(drm_dev);
 191         drm_kms_helper_poll_fini(drm_dev);
 192
 193         drm_atomic_helper_shutdown(drm_dev);
 194         component_unbind_all(dev, drm_dev);
 195         drm_mode_config_cleanup(drm_dev);
 196         rockchip_iommu_cleanup(drm_dev);
 197
 198         drm_dev->dev_private = NULL;
 199         dev_set_drvdata(dev, NULL);
 200         drm_dev_put(drm_dev);
 201 }
 202
 203 static const struct file_operations rockchip_drm_driver_fops = {
 204         .owner = THIS_MODULE,
 205         .open = drm_open,
 206         .mmap = rockchip_gem_mmap,
 207         .poll = drm_poll,
 208         .read = drm_read,
 209         .unlocked_ioctl = drm_ioctl,
 210         .compat_ioctl = drm_compat_ioctl,
 211         .release = drm_release,
 212 };
 213
 214 static struct drm_driver rockchip_drm_driver = {
 215         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 216                                   DRIVER_PRIME | DRIVER_ATOMIC,
 217         .lastclose              = drm_fb_helper_lastclose,
 218         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 219         .gem_free_object_unlocked = rockchip_gem_free_object,
 220         .dumb_create            = rockchip_gem_dumb_create,
 221         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 222         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 223         .gem_prime_import       = drm_gem_prime_import,
 224         .gem_prime_export       = drm_gem_prime_export,
 225         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 226         .gem_prime_import_sg_table      = rockchip_gem_prime_import_sg_table,
 227         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 228         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 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 = bus_find_device(&platform_bus_type, p, &drv->driver,
 334                                             (void *)platform_bus_type.match);
 335                         put_device(p);
 336                         p = d;
 337
 338                         if (!d)
 339                                 break;
 340
 341                         device_link_add(dev, d, DL_FLAG_STATELESS);
 342                         component_match_add(dev, &match, compare_dev, d);
 343                 } while (true);
 344         }
 345
 346         if (IS_ERR(match))
 347                 rockchip_drm_match_remove(dev);
 348
 349         return match ?: ERR_PTR(-ENODEV);
 350 }
 351
 352 static const struct component_master_ops rockchip_drm_ops = {
 353         .bind = rockchip_drm_bind,
 354         .unbind = rockchip_drm_unbind,
 355 };
 356
 357 static int rockchip_drm_platform_of_probe(struct device *dev)
 358 {
 359         struct device_node *np = dev->of_node;
 360         struct device_node *port;
 361         bool found = false;
 362         int i;
 363
 364         if (!np)
 365                 return -ENODEV;
 366
 367         for (i = 0;; i++) {
 368                 struct device_node *iommu;
 369
 370                 port = of_parse_phandle(np, "ports", i);
 371                 if (!port)
 372                         break;
 373
 374                 if (!of_device_is_available(port->parent)) {
 375                         of_node_put(port);
 376                         continue;
 377                 }
 378
 379                 iommu = of_parse_phandle(port->parent, "iommus", 0);
 380                 if (!iommu || !of_device_is_available(iommu->parent)) {
 381                         DRM_DEV_DEBUG(dev,
 382                                       "no iommu attached for %pOF, using non-iommu buffers\n",
 383                                       port->parent);
 384                         /*
 385                          * if there is a crtc not support iommu, force set all
 386                          * crtc use non-iommu buffer.
 387                          */
 388                         is_support_iommu = false;
 389                 }
 390
 391                 found = true;
 392
 393                 of_node_put(iommu);
 394                 of_node_put(port);
 395         }
 396
 397         if (i == 0) {
 398                 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
 399                 return -ENODEV;
 400         }
 401
 402         if (!found) {
 403                 DRM_DEV_ERROR(dev,
 404                               "No available vop found for display-subsystem.\n");
 405                 return -ENODEV;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 412 {
 413         struct device *dev = &pdev->dev;
 414         struct component_match *match = NULL;
 415         int ret;
 416
 417         ret = rockchip_drm_platform_of_probe(dev);
 418         if (ret)
 419                 return ret;
 420
 421         match = rockchip_drm_match_add(dev);
 422         if (IS_ERR(match))
 423                 return PTR_ERR(match);
 424
 425         ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
 426         if (ret < 0) {
 427                 rockchip_drm_match_remove(dev);
 428                 return ret;
 429         }
 430
 431         return 0;
 432 }
 433
 434 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 435 {
 436         component_master_del(&pdev->dev, &rockchip_drm_ops);
 437
 438         rockchip_drm_match_remove(&pdev->dev);
 439
 440         return 0;
 441 }
 442
 443 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
 444 {
 445         struct drm_device *drm = platform_get_drvdata(pdev);
 446
 447         if (drm)
 448                 drm_atomic_helper_shutdown(drm);
 449 }
 450
 451 static const struct of_device_id rockchip_drm_dt_ids[] = {
 452         { .compatible = "rockchip,display-subsystem", },
 453         { /* sentinel */ },
 454 };
 455 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 456
 457 static struct platform_driver rockchip_drm_platform_driver = {
 458         .probe = rockchip_drm_platform_probe,
 459         .remove = rockchip_drm_platform_remove,
 460         .shutdown = rockchip_drm_platform_shutdown,
 461         .driver = {
 462                 .name = "rockchip-drm",
 463                 .of_match_table = rockchip_drm_dt_ids,
 464                 .pm = &rockchip_drm_pm_ops,
 465         },
 466 };
 467
 468 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \
 469         if (IS_ENABLED(cond) && \
 470             !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \
 471                 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \
 472 }
 473
 474 static int __init rockchip_drm_init(void)
 475 {
 476         int ret;
 477
 478         num_rockchip_sub_drivers = 0;
 479         ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP);
 480         ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver,
 481                                 CONFIG_ROCKCHIP_LVDS);
 482         ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver,
 483                                 CONFIG_ROCKCHIP_ANALOGIX_DP);
 484         ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP);
 485         ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver,
 486                                 CONFIG_ROCKCHIP_DW_HDMI);
 487         ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver,
 488                                 CONFIG_ROCKCHIP_DW_MIPI_DSI);
 489         ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI);
 490         ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver,
 491                                 CONFIG_ROCKCHIP_RK3066_HDMI);
 492
 493         ret = platform_register_drivers(rockchip_sub_drivers,
 494                                         num_rockchip_sub_drivers);
 495         if (ret)
 496                 return ret;
 497
 498         ret = platform_driver_register(&rockchip_drm_platform_driver);
 499         if (ret)
 500                 goto err_unreg_drivers;
 501
 502         return 0;
 503
 504 err_unreg_drivers:
 505         platform_unregister_drivers(rockchip_sub_drivers,
 506                                     num_rockchip_sub_drivers);
 507         return ret;
 508 }
 509
 510 static void __exit rockchip_drm_fini(void)
 511 {
 512         platform_driver_unregister(&rockchip_drm_platform_driver);
 513
 514         platform_unregister_drivers(rockchip_sub_drivers,
 515                                     num_rockchip_sub_drivers);
 516 }
 517
 518 module_init(rockchip_drm_init);
 519 module_exit(rockchip_drm_fini);
 520
 521 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 522 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 523 MODULE_LICENSE("GPL v2");