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_device *dev,
  68                                  const struct rockchip_crtc_funcs *crtc_funcs,
  69                                  int pipe)
  70 {
  71         struct rockchip_drm_private *priv = 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_device *dev, int pipe)
  83 {
  84         struct rockchip_drm_private *priv = dev->dev_private;
  85
  86         if (pipe > ROCKCHIP_MAX_CRTC)
  87                 return;
  88
  89         priv->crtc_funcs[pipe] = NULL;
  90 }
  91 EXPORT_SYMBOL_GPL(rockchip_unregister_crtc_funcs);
  92
  93 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
  94                                                 int pipe)
  95 {
  96         struct drm_crtc *crtc;
  97         int i = 0;
  98
  99         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
 100                 if (i++ == pipe)
 101                         return crtc;
 102
 103         return NULL;
 104 }
 105
 106 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev,
 107                                            unsigned int pipe)
 108 {
 109         struct rockchip_drm_private *priv = dev->dev_private;
 110         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 111
 112         if (crtc && priv->crtc_funcs[pipe] &&
 113             priv->crtc_funcs[pipe]->enable_vblank)
 114                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 115
 116         return 0;
 117 }
 118
 119 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
 120                                              unsigned int pipe)
 121 {
 122         struct rockchip_drm_private *priv = dev->dev_private;
 123         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 124
 125         if (crtc && priv->crtc_funcs[pipe] &&
 126             priv->crtc_funcs[pipe]->enable_vblank)
 127                 priv->crtc_funcs[pipe]->disable_vblank(crtc);
 128 }
 129
 130 static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
 131 {
 132         struct rockchip_drm_private *private;
 133         struct dma_iommu_mapping *mapping;
 134         struct device *dev = drm_dev->dev;
 135         struct drm_connector *connector;
 136         int ret;
 137
 138         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 139         if (!private)
 140                 return -ENOMEM;
 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         ret = rockchip_drm_fbdev_init(drm_dev);
 216         if (ret)
 217                 goto err_vblank_cleanup;
 218
 219         return 0;
 220 err_vblank_cleanup:
 221         drm_vblank_cleanup(drm_dev);
 222 err_kms_helper_poll_fini:
 223         drm_kms_helper_poll_fini(drm_dev);
 224 err_unbind:
 225         component_unbind_all(dev, drm_dev);
 226 err_detach_device:
 227         arm_iommu_detach_device(dev);
 228 err_release_mapping:
 229         arm_iommu_release_mapping(dev->archdata.mapping);
 230 err_config_cleanup:
 231         drm_mode_config_cleanup(drm_dev);
 232         drm_dev->dev_private = NULL;
 233         return ret;
 234 }
 235
 236 static int rockchip_drm_unload(struct drm_device *drm_dev)
 237 {
 238         struct device *dev = drm_dev->dev;
 239
 240         rockchip_drm_fbdev_fini(drm_dev);
 241         drm_vblank_cleanup(drm_dev);
 242         drm_kms_helper_poll_fini(drm_dev);
 243         component_unbind_all(dev, drm_dev);
 244         arm_iommu_detach_device(dev);
 245         arm_iommu_release_mapping(dev->archdata.mapping);
 246         drm_mode_config_cleanup(drm_dev);
 247         drm_dev->dev_private = NULL;
 248
 249         return 0;
 250 }
 251
 252 void rockchip_drm_lastclose(struct drm_device *dev)
 253 {
 254         struct rockchip_drm_private *priv = dev->dev_private;
 255
 256         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 257 }
 258
 259 static const struct file_operations rockchip_drm_driver_fops = {
 260         .owner = THIS_MODULE,
 261         .open = drm_open,
 262         .mmap = rockchip_gem_mmap,
 263         .poll = drm_poll,
 264         .read = drm_read,
 265         .unlocked_ioctl = drm_ioctl,
 266 #ifdef CONFIG_COMPAT
 267         .compat_ioctl = drm_compat_ioctl,
 268 #endif
 269         .release = drm_release,
 270 };
 271
 272 const struct vm_operations_struct rockchip_drm_vm_ops = {
 273         .open = drm_gem_vm_open,
 274         .close = drm_gem_vm_close,
 275 };
 276
 277 static struct drm_driver rockchip_drm_driver = {
 278         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 279         .load                   = rockchip_drm_load,
 280         .unload                 = rockchip_drm_unload,
 281         .lastclose              = rockchip_drm_lastclose,
 282         .get_vblank_counter     = drm_vblank_no_hw_counter,
 283         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 284         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 285         .gem_vm_ops             = &rockchip_drm_vm_ops,
 286         .gem_free_object        = rockchip_gem_free_object,
 287         .dumb_create            = rockchip_gem_dumb_create,
 288         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 289         .dumb_destroy           = drm_gem_dumb_destroy,
 290         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 291         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 292         .gem_prime_import       = drm_gem_prime_import,
 293         .gem_prime_export       = drm_gem_prime_export,
 294         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 295         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 296         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 297         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 298         .fops                   = &rockchip_drm_driver_fops,
 299         .name   = DRIVER_NAME,
 300         .desc   = DRIVER_DESC,
 301         .date   = DRIVER_DATE,
 302         .major  = DRIVER_MAJOR,
 303         .minor  = DRIVER_MINOR,
 304 };
 305
 306 #ifdef CONFIG_PM_SLEEP
 307 static int rockchip_drm_sys_suspend(struct device *dev)
 308 {
 309         struct drm_device *drm = dev_get_drvdata(dev);
 310         struct drm_connector *connector;
 311
 312         if (!drm)
 313                 return 0;
 314
 315         drm_modeset_lock_all(drm);
 316         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 317                 int old_dpms = connector->dpms;
 318
 319                 if (connector->funcs->dpms)
 320                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 321
 322                 /* Set the old mode back to the connector for resume */
 323                 connector->dpms = old_dpms;
 324         }
 325         drm_modeset_unlock_all(drm);
 326
 327         return 0;
 328 }
 329
 330 static int rockchip_drm_sys_resume(struct device *dev)
 331 {
 332         struct drm_device *drm = dev_get_drvdata(dev);
 333         struct drm_connector *connector;
 334         enum drm_connector_status status;
 335         bool changed = false;
 336
 337         if (!drm)
 338                 return 0;
 339
 340         drm_modeset_lock_all(drm);
 341         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 342                 int desired_mode = connector->dpms;
 343
 344                 /*
 345                  * at suspend time, we save dpms to connector->dpms,
 346                  * restore the old_dpms, and at current time, the connector
 347                  * dpms status must be DRM_MODE_DPMS_OFF.
 348                  */
 349                 connector->dpms = DRM_MODE_DPMS_OFF;
 350
 351                 /*
 352                  * If the connector has been disconnected during suspend,
 353                  * disconnect it from the encoder and leave it off. We'll notify
 354                  * userspace at the end.
 355                  */
 356                 if (desired_mode == DRM_MODE_DPMS_ON) {
 357                         status = connector->funcs->detect(connector, true);
 358                         if (status == connector_status_disconnected) {
 359                                 connector->encoder = NULL;
 360                                 connector->status = status;
 361                                 changed = true;
 362                                 continue;
 363                         }
 364                 }
 365                 if (connector->funcs->dpms)
 366                         connector->funcs->dpms(connector, desired_mode);
 367         }
 368         drm_modeset_unlock_all(drm);
 369
 370         drm_helper_resume_force_mode(drm);
 371
 372         if (changed)
 373                 drm_kms_helper_hotplug_event(drm);
 374
 375         return 0;
 376 }
 377 #endif
 378
 379 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 380         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 381                                 rockchip_drm_sys_resume)
 382 };
 383
 384 /*
 385  * @node: device tree node containing encoder input ports
 386  * @encoder: drm_encoder
 387  */
 388 int rockchip_drm_encoder_get_mux_id(struct device_node *node,
 389                                     struct drm_encoder *encoder)
 390 {
 391         struct device_node *ep;
 392         struct drm_crtc *crtc = encoder->crtc;
 393         struct of_endpoint endpoint;
 394         struct device_node *port;
 395         int ret;
 396
 397         if (!node || !crtc)
 398                 return -EINVAL;
 399
 400         for_each_endpoint_of_node(node, ep) {
 401                 port = of_graph_get_remote_port(ep);
 402                 of_node_put(port);
 403                 if (port == crtc->port) {
 404                         ret = of_graph_parse_endpoint(ep, &endpoint);
 405                         of_node_put(ep);
 406                         return ret ?: endpoint.id;
 407                 }
 408         }
 409
 410         return -EINVAL;
 411 }
 412 EXPORT_SYMBOL_GPL(rockchip_drm_encoder_get_mux_id);
 413
 414 static int compare_of(struct device *dev, void *data)
 415 {
 416         struct device_node *np = data;
 417
 418         return dev->of_node == np;
 419 }
 420
 421 static void rockchip_add_endpoints(struct device *dev,
 422                                    struct component_match **match,
 423                                    struct device_node *port)
 424 {
 425         struct device_node *ep, *remote;
 426
 427         for_each_child_of_node(port, ep) {
 428                 remote = of_graph_get_remote_port_parent(ep);
 429                 if (!remote || !of_device_is_available(remote)) {
 430                         of_node_put(remote);
 431                         continue;
 432                 } else if (!of_device_is_available(remote->parent)) {
 433                         dev_warn(dev, "parent device of %s is not available\n",
 434                                  remote->full_name);
 435                         of_node_put(remote);
 436                         continue;
 437                 }
 438
 439                 component_match_add(dev, match, compare_of, remote);
 440                 of_node_put(remote);
 441         }
 442 }
 443
 444 static int rockchip_drm_bind(struct device *dev)
 445 {
 446         struct drm_device *drm;
 447         int ret;
 448
 449         drm = drm_dev_alloc(&rockchip_drm_driver, dev);
 450         if (!drm)
 451                 return -ENOMEM;
 452
 453         ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
 454         if (ret)
 455                 goto err_free;
 456
 457         ret = drm_dev_register(drm, 0);
 458         if (ret)
 459                 goto err_free;
 460
 461         dev_set_drvdata(dev, drm);
 462
 463         return 0;
 464
 465 err_free:
 466         drm_dev_unref(drm);
 467         return ret;
 468 }
 469
 470 static void rockchip_drm_unbind(struct device *dev)
 471 {
 472         struct drm_device *drm = dev_get_drvdata(dev);
 473
 474         drm_dev_unregister(drm);
 475         drm_dev_unref(drm);
 476         dev_set_drvdata(dev, NULL);
 477 }
 478
 479 static const struct component_master_ops rockchip_drm_ops = {
 480         .bind = rockchip_drm_bind,
 481         .unbind = rockchip_drm_unbind,
 482 };
 483
 484 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 485 {
 486         struct device *dev = &pdev->dev;
 487         struct component_match *match = NULL;
 488         struct device_node *np = dev->of_node;
 489         struct device_node *port;
 490         int i;
 491
 492         if (!np)
 493                 return -ENODEV;
 494         /*
 495          * Bind the crtc ports first, so that
 496          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 497          * works as expected.
 498          */
 499         for (i = 0;; i++) {
 500                 port = of_parse_phandle(np, "ports", i);
 501                 if (!port)
 502                         break;
 503
 504                 if (!of_device_is_available(port->parent)) {
 505                         of_node_put(port);
 506                         continue;
 507                 }
 508
 509                 component_match_add(dev, &match, compare_of, port->parent);
 510                 of_node_put(port);
 511         }
 512
 513         if (i == 0) {
 514                 dev_err(dev, "missing 'ports' property\n");
 515                 return -ENODEV;
 516         }
 517
 518         if (!match) {
 519                 dev_err(dev, "No available vop found for display-subsystem.\n");
 520                 return -ENODEV;
 521         }
 522         /*
 523          * For each bound crtc, bind the encoders attached to its
 524          * remote endpoint.
 525          */
 526         for (i = 0;; i++) {
 527                 port = of_parse_phandle(np, "ports", i);
 528                 if (!port)
 529                         break;
 530
 531                 if (!of_device_is_available(port->parent)) {
 532                         of_node_put(port);
 533                         continue;
 534                 }
 535
 536                 rockchip_add_endpoints(dev, &match, port);
 537                 of_node_put(port);
 538         }
 539
 540         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 541 }
 542
 543 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 544 {
 545         component_master_del(&pdev->dev, &rockchip_drm_ops);
 546
 547         return 0;
 548 }
 549
 550 static const struct of_device_id rockchip_drm_dt_ids[] = {
 551         { .compatible = "rockchip,display-subsystem", },
 552         { /* sentinel */ },
 553 };
 554 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 555
 556 static struct platform_driver rockchip_drm_platform_driver = {
 557         .probe = rockchip_drm_platform_probe,
 558         .remove = rockchip_drm_platform_remove,
 559         .driver = {
 560                 .name = "rockchip-drm",
 561                 .of_match_table = rockchip_drm_dt_ids,
 562                 .pm = &rockchip_drm_pm_ops,
 563         },
 564 };
 565
 566 module_platform_driver(rockchip_drm_platform_driver);
 567
 568 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 569 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 570 MODULE_LICENSE("GPL v2");