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 EXPORT_SYMBOL_GPL(rockchip_drm_dma_attach_device);
  59
  60 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
  61                                     struct device *dev)
  62 {
  63         arm_iommu_detach_device(dev);
  64 }
  65 EXPORT_SYMBOL_GPL(rockchip_drm_dma_detach_device);
  66
  67 int rockchip_register_crtc_funcs(struct drm_crtc *crtc,
  68                                  const struct rockchip_crtc_funcs *crtc_funcs)
  69 {
  70         int pipe = drm_crtc_index(crtc);
  71         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  72
  73         if (pipe > ROCKCHIP_MAX_CRTC)
  74                 return -EINVAL;
  75
  76         priv->crtc_funcs[pipe] = crtc_funcs;
  77
  78         return 0;
  79 }
  80 EXPORT_SYMBOL_GPL(rockchip_register_crtc_funcs);
  81
  82 void rockchip_unregister_crtc_funcs(struct drm_crtc *crtc)
  83 {
  84         int pipe = drm_crtc_index(crtc);
  85         struct rockchip_drm_private *priv = crtc->dev->dev_private;
  86
  87         if (pipe > ROCKCHIP_MAX_CRTC)
  88                 return;
  89
  90         priv->crtc_funcs[pipe] = NULL;
  91 }
  92 EXPORT_SYMBOL_GPL(rockchip_unregister_crtc_funcs);
  93
  94 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
  95                                                 int pipe)
  96 {
  97         struct drm_crtc *crtc;
  98         int i = 0;
  99
 100         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 101                 if (i++ == pipe)
 102                         return crtc;
 103
 104         return NULL;
 105 }
 106
 107 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 108                                            unsigned int pipe)
 109 {
 110         struct rockchip_drm_private *priv = dev->dev_private;
 111         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 112
 113         if (crtc && priv->crtc_funcs[pipe] &&
 114             priv->crtc_funcs[pipe]->enable_vblank)
 115                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 116
 117         return 0;
 118 }
 119
 120 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 121                                              unsigned int pipe)
 122 {
 123         struct rockchip_drm_private *priv = dev->dev_private;
 124         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 125
 126         if (crtc && priv->crtc_funcs[pipe] &&
 127             priv->crtc_funcs[pipe]->enable_vblank)
 128                 priv->crtc_funcs[pipe]->disable_vblank(crtc);
 129 }
 130
 131 static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
 132 {
 133         struct rockchip_drm_private *private;
 134         struct dma_iommu_mapping *mapping;
 135         struct device *dev = drm_dev->dev;
 136         struct drm_connector *connector;
 137         int ret;
 138
 139         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 140         if (!private)
 141                 return -ENOMEM;
 142
 143         mutex_init(&private->commit.lock);
 144         INIT_WORK(&private->commit.work, rockchip_drm_atomic_work);
 145
 146         drm_dev->dev_private = private;
 147
 148         drm_mode_config_init(drm_dev);
 149
 150         rockchip_drm_mode_config_init(drm_dev);
 151
 152         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 153                                       GFP_KERNEL);
 154         if (!dev->dma_parms) {
 155                 ret = -ENOMEM;
 156                 goto err_config_cleanup;
 157         }
 158
 159         /* TODO(djkurtz): fetch the mapping start/size from somewhere */
 160         mapping = arm_iommu_create_mapping(&platform_bus_type, 0x00000000,
 161                                            SZ_2G);
 162         if (IS_ERR(mapping)) {
 163                 ret = PTR_ERR(mapping);
 164                 goto err_config_cleanup;
 165         }
 166
 167         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 168         if (ret)
 169                 goto err_release_mapping;
 170
 171         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 172
 173         ret = arm_iommu_attach_device(dev, mapping);
 174         if (ret)
 175                 goto err_release_mapping;
 176
 177         /* Try to bind all sub drivers. */
 178         ret = component_bind_all(dev, drm_dev);
 179         if (ret)
 180                 goto err_detach_device;
 181
 182         /*
 183          * All components are now added, we can publish the connector sysfs
 184          * entries to userspace.  This will generate hotplug events and so
 185          * userspace will expect to be able to access DRM at this point.
 186          */
 187         list_for_each_entry(connector, &drm_dev->mode_config.connector_list,
 188                         head) {
 189                 ret = drm_connector_register(connector);
 190                 if (ret) {
 191                         dev_err(drm_dev->dev,
 192                                 "[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
 193                                 connector->base.id,
 194                                 connector->name, ret);
 195                         goto err_unbind;
 196                 }
 197         }
 198
 199         /* init kms poll for handling hpd */
 200         drm_kms_helper_poll_init(drm_dev);
 201
 202         /*
 203          * enable drm irq mode.
 204          * - with irq_enabled = true, we can use the vblank feature.
 205          */
 206         drm_dev->irq_enabled = true;
 207
 208         ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 209         if (ret)
 210                 goto err_kms_helper_poll_fini;
 211
 212         /*
 213          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 214          * by drm timer once a current process gives up ownership of
 215          * vblank event.(after drm_vblank_put function is called)
 216          */
 217         drm_dev->vblank_disable_allowed = true;
 218
 219         drm_mode_config_reset(drm_dev);
 220
 221         ret = rockchip_drm_fbdev_init(drm_dev);
 222         if (ret)
 223                 goto err_vblank_cleanup;
 224
 225         return 0;
 226 err_vblank_cleanup:
 227         drm_vblank_cleanup(drm_dev);
 228 err_kms_helper_poll_fini:
 229         drm_kms_helper_poll_fini(drm_dev);
 230 err_unbind:
 231         component_unbind_all(dev, drm_dev);
 232 err_detach_device:
 233         arm_iommu_detach_device(dev);
 234 err_release_mapping:
 235         arm_iommu_release_mapping(dev->archdata.mapping);
 236 err_config_cleanup:
 237         drm_mode_config_cleanup(drm_dev);
 238         drm_dev->dev_private = NULL;
 239         return ret;
 240 }
 241
 242 static int rockchip_drm_unload(struct drm_device *drm_dev)
 243 {
 244         struct device *dev = drm_dev->dev;
 245
 246         rockchip_drm_fbdev_fini(drm_dev);
 247         drm_vblank_cleanup(drm_dev);
 248         drm_kms_helper_poll_fini(drm_dev);
 249         component_unbind_all(dev, drm_dev);
 250         arm_iommu_detach_device(dev);
 251         arm_iommu_release_mapping(dev->archdata.mapping);
 252         drm_mode_config_cleanup(drm_dev);
 253         drm_dev->dev_private = NULL;
 254
 255         return 0;
 256 }
 257
 258 void rockchip_drm_lastclose(struct drm_device *dev)
 259 {
 260         struct rockchip_drm_private *priv = dev->dev_private;
 261
 262         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 263 }
 264
 265 static const struct file_operations rockchip_drm_driver_fops = {
 266         .owner = THIS_MODULE,
 267         .open = drm_open,
 268         .mmap = rockchip_gem_mmap,
 269         .poll = drm_poll,
 270         .read = drm_read,
 271         .unlocked_ioctl = drm_ioctl,
 272 #ifdef CONFIG_COMPAT
 273         .compat_ioctl = drm_compat_ioctl,
 274 #endif
 275         .release = drm_release,
 276 };
 277
 278 const struct vm_operations_struct rockchip_drm_vm_ops = {
 279         .open = drm_gem_vm_open,
 280         .close = drm_gem_vm_close,
 281 };
 282
 283 static struct drm_driver rockchip_drm_driver = {
 284         .driver_features        = DRIVER_MODESET | DRIVER_GEM |
 285                                   DRIVER_PRIME | DRIVER_ATOMIC,
 286         .load                   = rockchip_drm_load,
 287         .unload                 = rockchip_drm_unload,
 288         .lastclose              = rockchip_drm_lastclose,
 289         .get_vblank_counter     = drm_vblank_no_hw_counter,
 290         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 291         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 292         .gem_vm_ops             = &rockchip_drm_vm_ops,
 293         .gem_free_object        = rockchip_gem_free_object,
 294         .dumb_create            = rockchip_gem_dumb_create,
 295         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 296         .dumb_destroy           = drm_gem_dumb_destroy,
 297         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 298         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 299         .gem_prime_import       = drm_gem_prime_import,
 300         .gem_prime_export       = drm_gem_prime_export,
 301         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 302         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 303         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 304         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 305         .fops                   = &rockchip_drm_driver_fops,
 306         .name   = DRIVER_NAME,
 307         .desc   = DRIVER_DESC,
 308         .date   = DRIVER_DATE,
 309         .major  = DRIVER_MAJOR,
 310         .minor  = DRIVER_MINOR,
 311 };
 312
 313 #ifdef CONFIG_PM_SLEEP
 314 static int rockchip_drm_sys_suspend(struct device *dev)
 315 {
 316         struct drm_device *drm = dev_get_drvdata(dev);
 317         struct drm_connector *connector;
 318
 319         if (!drm)
 320                 return 0;
 321
 322         drm_modeset_lock_all(drm);
 323         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 324                 int old_dpms = connector->dpms;
 325
 326                 if (connector->funcs->dpms)
 327                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 328
 329                 /* Set the old mode back to the connector for resume */
 330                 connector->dpms = old_dpms;
 331         }
 332         drm_modeset_unlock_all(drm);
 333
 334         return 0;
 335 }
 336
 337 static int rockchip_drm_sys_resume(struct device *dev)
 338 {
 339         struct drm_device *drm = dev_get_drvdata(dev);
 340         struct drm_connector *connector;
 341         enum drm_connector_status status;
 342         bool changed = false;
 343
 344         if (!drm)
 345                 return 0;
 346
 347         drm_modeset_lock_all(drm);
 348         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 349                 int desired_mode = connector->dpms;
 350
 351                 /*
 352                  * at suspend time, we save dpms to connector->dpms,
 353                  * restore the old_dpms, and at current time, the connector
 354                  * dpms status must be DRM_MODE_DPMS_OFF.
 355                  */
 356                 connector->dpms = DRM_MODE_DPMS_OFF;
 357
 358                 /*
 359                  * If the connector has been disconnected during suspend,
 360                  * disconnect it from the encoder and leave it off. We'll notify
 361                  * userspace at the end.
 362                  */
 363                 if (desired_mode == DRM_MODE_DPMS_ON) {
 364                         status = connector->funcs->detect(connector, true);
 365                         if (status == connector_status_disconnected) {
 366                                 connector->encoder = NULL;
 367                                 connector->status = status;
 368                                 changed = true;
 369                                 continue;
 370                         }
 371                 }
 372                 if (connector->funcs->dpms)
 373                         connector->funcs->dpms(connector, desired_mode);
 374         }
 375         drm_modeset_unlock_all(drm);
 376
 377         drm_helper_resume_force_mode(drm);
 378
 379         if (changed)
 380                 drm_kms_helper_hotplug_event(drm);
 381
 382         return 0;
 383 }
 384 #endif
 385
 386 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 387         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 388                                 rockchip_drm_sys_resume)
 389 };
 390
 391 /*
 392  * @node: device tree node containing encoder input ports
 393  * @encoder: drm_encoder
 394  */
 395 int rockchip_drm_encoder_get_mux_id(struct device_node *node,
 396                                     struct drm_encoder *encoder)
 397 {
 398         struct device_node *ep;
 399         struct drm_crtc *crtc = encoder->crtc;
 400         struct of_endpoint endpoint;
 401         struct device_node *port;
 402         int ret;
 403
 404         if (!node || !crtc)
 405                 return -EINVAL;
 406
 407         for_each_endpoint_of_node(node, ep) {
 408                 port = of_graph_get_remote_port(ep);
 409                 of_node_put(port);
 410                 if (port == crtc->port) {
 411                         ret = of_graph_parse_endpoint(ep, &endpoint);
 412                         of_node_put(ep);
 413                         return ret ?: endpoint.id;
 414                 }
 415         }
 416
 417         return -EINVAL;
 418 }
 419 EXPORT_SYMBOL_GPL(rockchip_drm_encoder_get_mux_id);
 420
 421 static int compare_of(struct device *dev, void *data)
 422 {
 423         struct device_node *np = data;
 424
 425         return dev->of_node == np;
 426 }
 427
 428 static void rockchip_add_endpoints(struct device *dev,
 429                                    struct component_match **match,
 430                                    struct device_node *port)
 431 {
 432         struct device_node *ep, *remote;
 433
 434         for_each_child_of_node(port, ep) {
 435                 remote = of_graph_get_remote_port_parent(ep);
 436                 if (!remote || !of_device_is_available(remote)) {
 437                         of_node_put(remote);
 438                         continue;
 439                 } else if (!of_device_is_available(remote->parent)) {
 440                         dev_warn(dev, "parent device of %s is not available\n",
 441                                  remote->full_name);
 442                         of_node_put(remote);
 443                         continue;
 444                 }
 445
 446                 component_match_add(dev, match, compare_of, remote);
 447                 of_node_put(remote);
 448         }
 449 }
 450
 451 static int rockchip_drm_bind(struct device *dev)
 452 {
 453         struct drm_device *drm;
 454         int ret;
 455
 456         drm = drm_dev_alloc(&rockchip_drm_driver, dev);
 457         if (!drm)
 458                 return -ENOMEM;
 459
 460         ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
 461         if (ret)
 462                 goto err_free;
 463
 464         ret = drm_dev_register(drm, 0);
 465         if (ret)
 466                 goto err_free;
 467
 468         dev_set_drvdata(dev, drm);
 469
 470         return 0;
 471
 472 err_free:
 473         drm_dev_unref(drm);
 474         return ret;
 475 }
 476
 477 static void rockchip_drm_unbind(struct device *dev)
 478 {
 479         struct drm_device *drm = dev_get_drvdata(dev);
 480
 481         drm_dev_unregister(drm);
 482         drm_dev_unref(drm);
 483         dev_set_drvdata(dev, NULL);
 484 }
 485
 486 static const struct component_master_ops rockchip_drm_ops = {
 487         .bind = rockchip_drm_bind,
 488         .unbind = rockchip_drm_unbind,
 489 };
 490
 491 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 492 {
 493         struct device *dev = &pdev->dev;
 494         struct component_match *match = NULL;
 495         struct device_node *np = dev->of_node;
 496         struct device_node *port;
 497         int i;
 498
 499         if (!np)
 500                 return -ENODEV;
 501         /*
 502          * Bind the crtc ports first, so that
 503          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 504          * works as expected.
 505          */
 506         for (i = 0;; i++) {
 507                 port = of_parse_phandle(np, "ports", i);
 508                 if (!port)
 509                         break;
 510
 511                 if (!of_device_is_available(port->parent)) {
 512                         of_node_put(port);
 513                         continue;
 514                 }
 515
 516                 component_match_add(dev, &match, compare_of, port->parent);
 517                 of_node_put(port);
 518         }
 519
 520         if (i == 0) {
 521                 dev_err(dev, "missing 'ports' property\n");
 522                 return -ENODEV;
 523         }
 524
 525         if (!match) {
 526                 dev_err(dev, "No available vop found for display-subsystem.\n");
 527                 return -ENODEV;
 528         }
 529         /*
 530          * For each bound crtc, bind the encoders attached to its
 531          * remote endpoint.
 532          */
 533         for (i = 0;; i++) {
 534                 port = of_parse_phandle(np, "ports", i);
 535                 if (!port)
 536                         break;
 537
 538                 if (!of_device_is_available(port->parent)) {
 539                         of_node_put(port);
 540                         continue;
 541                 }
 542
 543                 rockchip_add_endpoints(dev, &match, port);
 544                 of_node_put(port);
 545         }
 546
 547         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 548 }
 549
 550 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 551 {
 552         component_master_del(&pdev->dev, &rockchip_drm_ops);
 553
 554         return 0;
 555 }
 556
 557 static const struct of_device_id rockchip_drm_dt_ids[] = {
 558         { .compatible = "rockchip,display-subsystem", },
 559         { /* sentinel */ },
 560 };
 561 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 562
 563 static struct platform_driver rockchip_drm_platform_driver = {
 564         .probe = rockchip_drm_platform_probe,
 565         .remove = rockchip_drm_platform_remove,
 566         .driver = {
 567                 .name = "rockchip-drm",
 568                 .of_match_table = rockchip_drm_dt_ids,
 569                 .pm = &rockchip_drm_pm_ops,
 570         },
 571 };
 572
 573 module_platform_driver(rockchip_drm_platform_driver);
 574
 575 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 576 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 577 MODULE_LICENSE("GPL v2");