drivers/gpu/drm/rockchip/rockchip_drm_drv.c

   1 /*
   2  * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
   3  * Author:Mark Yao <mark.yao@rock-chips.com>
   4  *
   5  * based on exynos_drm_drv.c
   6  *
   7  * This software is licensed under the terms of the GNU General Public
   8  * License version 2, as published by the Free Software Foundation, and
   9  * may be copied, distributed, and modified under those terms.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <asm/dma-iommu.h>
  18
  19 #include <drm/drmP.h>
  20 #include <drm/drm_crtc_helper.h>
  21 #include <drm/drm_fb_helper.h>
  22 #include <linux/dma-mapping.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/module.h>
  25 #include <linux/of_graph.h>
  26 #include <linux/component.h>
  27
  28 #include "rockchip_drm_drv.h"
  29 #include "rockchip_drm_fb.h"
  30 #include "rockchip_drm_fbdev.h"
  31 #include "rockchip_drm_gem.h"
  32
  33 #define DRIVER_NAME     "rockchip"
  34 #define DRIVER_DESC     "RockChip Soc DRM"
  35 #define DRIVER_DATE     "20140818"
  36 #define DRIVER_MAJOR    1
  37 #define DRIVER_MINOR    0
  38
  39 /*
  40  * Attach a (component) device to the shared drm dma mapping from master drm
  41  * device.  This is used by the VOPs to map GEM buffers to a common DMA
  42  * mapping.
  43  */
  44 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
  45                                    struct device *dev)
  46 {
  47         struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
  48         int ret;
  49
  50         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
  51         if (ret)
  52                 return ret;
  53
  54         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
  55
  56         return arm_iommu_attach_device(dev, mapping);
  57 }
  58
  59 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  60                                     struct device *dev)
  61 {
  62         arm_iommu_detach_device(dev);
  63 }
  64
  65 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
  66                                  const struct rockchip_crtc_funcs *crtc_funcs)
  67 {
  68         int pipe = drm_crtc_index(crtc);
  69         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  70
  71         if (pipe > ROCKCHIP_MAX_CRTC)
  72                 return -EINVAL;
  73
  74         priv->crtc_funcs[pipe] = crtc_funcs;
  75
  76         return 0;
  77 }
  78
  79 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
  80 {
  81         int pipe = drm_crtc_index(crtc);
  82         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  83
  84         if (pipe > ROCKCHIP_MAX_CRTC)
  85                 return;
  86
  87         priv->crtc_funcs[pipe] = NULL;
  88 }
  89
  90 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
  91                                                 int pipe)
  92 {
  93         struct drm_crtc *crtc;
  94         int i = 0;
  95
  96         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
  97                 if (i++ == pipe)
  98                         return crtc;
  99
 100         return NULL;
 101 }
 102
 103 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 104                                            unsigned int pipe)
 105 {
 106         struct rockchip_drm_private *priv = dev->dev_private;
 107         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 108
 109         if (crtc && priv->crtc_funcs[pipe] &&
 110             priv->crtc_funcs[pipe]->enable_vblank)
 111                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 112
 113         return 0;
 114 }
 115
 116 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 117                                              unsigned int pipe)
 118 {
 119         struct rockchip_drm_private *priv = dev->dev_private;
 120         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 121
 122         if (crtc && priv->crtc_funcs[pipe] &&
 123             priv->crtc_funcs[pipe]->enable_vblank)
 124                 priv->crtc_funcs[pipe]->disable_vblank(crtc);
 125 }
 126
 127 static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
 128 {
 129         struct rockchip_drm_private *private;
 130         struct dma_iommu_mapping *mapping;
 131         struct device *dev = drm_dev->dev;
 132         struct drm_connector *connector;
 133         int ret;
 134
 135         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 136         if (!private)
 137                 return -ENOMEM;
 138
 139         mutex_init(&private->commit.lock);
 140         INIT_WORK(&private->commit.work, rockchip_drm_atomic_work);
 141
 142         drm_dev->dev_private = private;
 143
 144         drm_mode_config_init(drm_dev);
 145
 146         rockchip_drm_mode_config_init(drm_dev);
 147
 148         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 149                                       GFP_KERNEL);
 150         if (!dev->dma_parms) {
 151                 ret = -ENOMEM;
 152                 goto err_config_cleanup;
 153         }
 154
 155         /* TODO(djkurtz): fetch the mapping start/size from somewhere */
 156         mapping = arm_iommu_create_mapping(&platform_bus_type, 0x00000000,
 157                                            SZ_2G);
 158         if (IS_ERR(mapping)) {
 159                 ret = PTR_ERR(mapping);
 160                 goto err_config_cleanup;
 161         }
 162
 163         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 164         if (ret)
 165                 goto err_release_mapping;
 166
 167         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 168
 169         ret = arm_iommu_attach_device(dev, mapping);
 170         if (ret)
 171                 goto err_release_mapping;
 172
 173         /* Try to bind all sub drivers. */
 174         ret = component_bind_all(dev, drm_dev);
 175         if (ret)
 176                 goto err_detach_device;
 177
 178         /*
 179          * All components are now added, we can publish the connector sysfs
 180          * entries to userspace.  This will generate hotplug events and so
 181          * userspace will expect to be able to access DRM at this point.
 182          */
 183         list_for_each_entry(connector, &drm_dev->mode_config.connector_list,
 184                         head) {
 185                 ret = drm_connector_register(connector);
 186                 if (ret) {
 187                         dev_err(drm_dev->dev,
 188                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 189                                 connector->base.id,
 190                                 connector->name, ret);
 191                         goto err_unbind;
 192                 }
 193         }
 194
 195         /* init kms poll for handling hpd */
 196         drm_kms_helper_poll_init(drm_dev);
 197
 198         /*
 199          * enable drm irq mode.
 200          * - with irq_enabled = true, we can use the vblank feature.
 201          */
 202         drm_dev->irq_enabled = true;
 203
 204         ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 205         if (ret)
 206                 goto err_kms_helper_poll_fini;
 207
 208         /*
 209          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 210          * by drm timer once a current process gives up ownership of
 211          * vblank event.(after drm_vblank_put function is called)
 212          */
 213         drm_dev->vblank_disable_allowed = true;
 214
 215         drm_mode_config_reset(drm_dev);
 216
 217         ret = rockchip_drm_fbdev_init(drm_dev);
 218         if (ret)
 219                 goto err_vblank_cleanup;
 220
 221         return 0;
 222 err_vblank_cleanup:
 223         drm_vblank_cleanup(drm_dev);
 224 err_kms_helper_poll_fini:
 225         drm_kms_helper_poll_fini(drm_dev);
 226 err_unbind:
 227         component_unbind_all(dev, drm_dev);
 228 err_detach_device:
 229         arm_iommu_detach_device(dev);
 230 err_release_mapping:
 231         arm_iommu_release_mapping(dev->archdata.mapping);
 232 err_config_cleanup:
 233         drm_mode_config_cleanup(drm_dev);
 234         drm_dev->dev_private = NULL;
 235         return ret;
 236 }
 237
 238 static int rockchip_drm_unload(struct drm_device *drm_dev)
 239 {
 240         struct device *dev = drm_dev->dev;
 241
 242         rockchip_drm_fbdev_fini(drm_dev);
 243         drm_vblank_cleanup(drm_dev);
 244         drm_kms_helper_poll_fini(drm_dev);
 245         component_unbind_all(dev, drm_dev);
 246         arm_iommu_detach_device(dev);
 247         arm_iommu_release_mapping(dev->archdata.mapping);
 248         drm_mode_config_cleanup(drm_dev);
 249         drm_dev->dev_private = NULL;
 250
 251         return 0;
 252 }
 253
 254 void rockchip_drm_lastclose(struct drm_device *dev)
 255 {
 256         struct rockchip_drm_private *priv = dev->dev_private;
 257
 258         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 259 }
 260
 261 static const struct file_operations rockchip_drm_driver_fops = {
 262         .owner = THIS_MODULE,
 263         .open = drm_open,
 264         .mmap = rockchip_gem_mmap,
 265         .poll = drm_poll,
 266         .read = drm_read,
 267         .unlocked_ioctl = drm_ioctl,
 268 #ifdef CONFIG_COMPAT
 269         .compat_ioctl = drm_compat_ioctl,
 270 #endif
 271         .release = drm_release,
 272 };
 273
 274 const struct vm_operations_struct rockchip_drm_vm_ops = {
 275         .open = drm_gem_vm_open,
 276         .close = drm_gem_vm_close,
 277 };
 278
 279 static struct drm_driver rockchip_drm_driver = {
 280         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 281                                   DRIVER_PRIME | DRIVER_ATOMIC,
 282         .load                   = rockchip_drm_load,
 283         .unload                 = rockchip_drm_unload,
 284         .lastclose              = rockchip_drm_lastclose,
 285         .get_vblank_counter     = drm_vblank_no_hw_counter,
 286         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 287         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 288         .gem_vm_ops             = &rockchip_drm_vm_ops,
 289         .gem_free_object        = rockchip_gem_free_object,
 290         .dumb_create            = rockchip_gem_dumb_create,
 291         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 292         .dumb_destroy           = drm_gem_dumb_destroy,
 293         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 294         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 295         .gem_prime_import       = drm_gem_prime_import,
 296         .gem_prime_export       = drm_gem_prime_export,
 297         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 298         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 299         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 300         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 301         .fops                   = &rockchip_drm_driver_fops,
 302         .name   = DRIVER_NAME,
 303         .desc   = DRIVER_DESC,
 304         .date   = DRIVER_DATE,
 305         .major  = DRIVER_MAJOR,
 306         .minor  = DRIVER_MINOR,
 307 };
 308
 309 #ifdef CONFIG_PM_SLEEP
 310 static int rockchip_drm_sys_suspend(struct device *dev)
 311 {
 312         struct drm_device *drm = dev_get_drvdata(dev);
 313         struct drm_connector *connector;
 314
 315         if (!drm)
 316                 return 0;
 317
 318         drm_modeset_lock_all(drm);
 319         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 320                 int old_dpms = connector->dpms;
 321
 322                 if (connector->funcs->dpms)
 323                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 324
 325                 /* Set the old mode back to the connector for resume */
 326                 connector->dpms = old_dpms;
 327         }
 328         drm_modeset_unlock_all(drm);
 329
 330         return 0;
 331 }
 332
 333 static int rockchip_drm_sys_resume(struct device *dev)
 334 {
 335         struct drm_device *drm = dev_get_drvdata(dev);
 336         struct drm_connector *connector;
 337         enum drm_connector_status status;
 338         bool changed = false;
 339
 340         if (!drm)
 341                 return 0;
 342
 343         drm_modeset_lock_all(drm);
 344         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 345                 int desired_mode = connector->dpms;
 346
 347                 /*
 348                  * at suspend time, we save dpms to connector->dpms,
 349                  * restore the old_dpms, and at current time, the connector
 350                  * dpms status must be DRM_MODE_DPMS_OFF.
 351                  */
 352                 connector->dpms = DRM_MODE_DPMS_OFF;
 353
 354                 /*
 355                  * If the connector has been disconnected during suspend,
 356                  * disconnect it from the encoder and leave it off. We'll notify
 357                  * userspace at the end.
 358                  */
 359                 if (desired_mode == DRM_MODE_DPMS_ON) {
 360                         status = connector->funcs->detect(connector, true);
 361                         if (status == connector_status_disconnected) {
 362                                 connector->encoder = NULL;
 363                                 connector->status = status;
 364                                 changed = true;
 365                                 continue;
 366                         }
 367                 }
 368                 if (connector->funcs->dpms)
 369                         connector->funcs->dpms(connector, desired_mode);
 370         }
 371         drm_modeset_unlock_all(drm);
 372
 373         drm_helper_resume_force_mode(drm);
 374
 375         if (changed)
 376                 drm_kms_helper_hotplug_event(drm);
 377
 378         return 0;
 379 }
 380 #endif
 381
 382 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 383         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 384                                 rockchip_drm_sys_resume)
 385 };
 386
 387 /*
 388  * @node: device tree node containing encoder input ports
 389  * @encoder: drm_encoder
 390  */
 391 int rockchip_drm_encoder_get_mux_id(struct device_node *node,
 392                                     struct drm_encoder *encoder)
 393 {
 394         struct device_node *ep;
 395         struct drm_crtc *crtc = encoder->crtc;
 396         struct of_endpoint endpoint;
 397         struct device_node *port;
 398         int ret;
 399
 400         if (!node || !crtc)
 401                 return -EINVAL;
 402
 403         for_each_endpoint_of_node(node, ep) {
 404                 port = of_graph_get_remote_port(ep);
 405                 of_node_put(port);
 406                 if (port == crtc->port) {
 407                         ret = of_graph_parse_endpoint(ep, &endpoint);
 408                         of_node_put(ep);
 409                         return ret ?: endpoint.id;
 410                 }
 411         }
 412
 413         return -EINVAL;
 414 }
 415 EXPORT_SYMBOL_GPL(rockchip_drm_encoder_get_mux_id);
 416
 417 static int compare_of(struct device *dev, void *data)
 418 {
 419         struct device_node *np = data;
 420
 421         return dev->of_node == np;
 422 }
 423
 424 static void rockchip_add_endpoints(struct device *dev,
 425                                    struct component_match **match,
 426                                    struct device_node *port)
 427 {
 428         struct device_node *ep, *remote;
 429
 430         for_each_child_of_node(port, ep) {
 431                 remote = of_graph_get_remote_port_parent(ep);
 432                 if (!remote || !of_device_is_available(remote)) {
 433                         of_node_put(remote);
 434                         continue;
 435                 } else if (!of_device_is_available(remote->parent)) {
 436                         dev_warn(dev, "parent device of %s is not available\n",
 437                                  remote->full_name);
 438                         of_node_put(remote);
 439                         continue;
 440                 }
 441
 442                 component_match_add(dev, match, compare_of, remote);
 443                 of_node_put(remote);
 444         }
 445 }
 446
 447 static int rockchip_drm_bind(struct device *dev)
 448 {
 449         struct drm_device *drm;
 450         int ret;
 451
 452         drm = drm_dev_alloc(&rockchip_drm_driver, dev);
 453         if (!drm)
 454                 return -ENOMEM;
 455
 456         ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
 457         if (ret)
 458                 goto err_free;
 459
 460         ret = drm_dev_register(drm, 0);
 461         if (ret)
 462                 goto err_free;
 463
 464         dev_set_drvdata(dev, drm);
 465
 466         return 0;
 467
 468 err_free:
 469         drm_dev_unref(drm);
 470         return ret;
 471 }
 472
 473 static void rockchip_drm_unbind(struct device *dev)
 474 {
 475         struct drm_device *drm = dev_get_drvdata(dev);
 476
 477         drm_dev_unregister(drm);
 478         drm_dev_unref(drm);
 479         dev_set_drvdata(dev, NULL);
 480 }
 481
 482 static const struct component_master_ops rockchip_drm_ops = {
 483         .bind = rockchip_drm_bind,
 484         .unbind = rockchip_drm_unbind,
 485 };
 486
 487 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 488 {
 489         struct device *dev = &pdev->dev;
 490         struct component_match *match = NULL;
 491         struct device_node *np = dev->of_node;
 492         struct device_node *port;
 493         int i;
 494
 495         if (!np)
 496                 return -ENODEV;
 497         /*
 498          * Bind the crtc ports first, so that
 499          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 500          * works as expected.
 501          */
 502         for (i = 0;; i++) {
 503                 port = of_parse_phandle(np, "ports", i);
 504                 if (!port)
 505                         break;
 506
 507                 if (!of_device_is_available(port->parent)) {
 508                         of_node_put(port);
 509                         continue;
 510                 }
 511
 512                 component_match_add(dev, &match, compare_of, port->parent);
 513                 of_node_put(port);
 514         }
 515
 516         if (i == 0) {
 517                 dev_err(dev, "missing 'ports' property\n");
 518                 return -ENODEV;
 519         }
 520
 521         if (!match) {
 522                 dev_err(dev, "No available vop found for display-subsystem.\n");
 523                 return -ENODEV;
 524         }
 525         /*
 526          * For each bound crtc, bind the encoders attached to its
 527          * remote endpoint.
 528          */
 529         for (i = 0;; i++) {
 530                 port = of_parse_phandle(np, "ports", i);
 531                 if (!port)
 532                         break;
 533
 534                 if (!of_device_is_available(port->parent)) {
 535                         of_node_put(port);
 536                         continue;
 537                 }
 538
 539                 rockchip_add_endpoints(dev, &match, port);
 540                 of_node_put(port);
 541         }
 542
 543         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 544 }
 545
 546 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 547 {
 548         component_master_del(&pdev->dev, &rockchip_drm_ops);
 549
 550         return 0;
 551 }
 552
 553 static const struct of_device_id rockchip_drm_dt_ids[] = {
 554         { .compatible = "rockchip,display-subsystem", },
 555         { /* sentinel */ },
 556 };
 557 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 558
 559 static struct platform_driver rockchip_drm_platform_driver = {
 560         .probe = rockchip_drm_platform_probe,
 561         .remove = rockchip_drm_platform_remove,
 562         .driver = {
 563                 .name = "rockchip-drm",
 564                 .of_match_table = rockchip_drm_dt_ids,
 565                 .pm = &rockchip_drm_pm_ops,
 566         },
 567 };
 568
 569 module_platform_driver(rockchip_drm_platform_driver);
 570
 571 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 572 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 573 MODULE_LICENSE("GPL v2");