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