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/of_graph.h>
  25 #include <linux/component.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 /*
  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 dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
  47         int ret;
  48
  49         ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
  50         if (ret)
  51                 return ret;
  52
  53         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
  54
  55         return arm_iommu_attach_device(dev, mapping);
  56 }
  57 EXPORT_SYMBOL_GPL(rockchip_drm_dma_attach_device);
  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 EXPORT_SYMBOL_GPL(rockchip_drm_dma_detach_device);
  65
  66 int rockchip_register_crtc_funcs(struct drm_device *dev,
  67                                  const struct rockchip_crtc_funcs *crtc_funcs,
  68                                  int pipe)
  69 {
  70         struct rockchip_drm_private *priv = dev->dev_private;
  71
  72         if (pipe > ROCKCHIP_MAX_CRTC)
  73                 return -EINVAL;
  74
  75         priv->crtc_funcs[pipe] = crtc_funcs;
  76
  77         return 0;
  78 }
  79 EXPORT_SYMBOL_GPL(rockchip_register_crtc_funcs);
  80
  81 void rockchip_unregister_crtc_funcs(struct drm_device *dev, int pipe)
  82 {
  83         struct rockchip_drm_private *priv = dev->dev_private;
  84
  85         if (pipe > ROCKCHIP_MAX_CRTC)
  86                 return;
  87
  88         priv->crtc_funcs[pipe] = NULL;
  89 }
  90 EXPORT_SYMBOL_GPL(rockchip_unregister_crtc_funcs);
  91
  92 static struct drm_crtc *rockchip_crtc_from_pipe(struct drm_device *drm,
  93                                                 int pipe)
  94 {
  95         struct drm_crtc *crtc;
  96         int i = 0;
  97
  98         list_for_each_entry(crtc, &drm->mode_config.crtc_list, head)
  99                 if (i++ == pipe)
 100                         return crtc;
 101
 102         return NULL;
 103 }
 104
 105 static int rockchip_drm_crtc_enable_vblank(struct drm_device *dev, int pipe)
 106 {
 107         struct rockchip_drm_private *priv = dev->dev_private;
 108         struct drm_crtc *crtc = rockchip_crtc_from_pipe(dev, pipe);
 109
 110         if (crtc && priv->crtc_funcs[pipe] &&
 111             priv->crtc_funcs[pipe]->enable_vblank)
 112                 return priv->crtc_funcs[pipe]->enable_vblank(crtc);
 113
 114         return 0;
 115 }
 116
 117 static void rockchip_drm_crtc_disable_vblank(struct drm_device *dev, 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         int ret;
 133
 134         private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
 135         if (!private)
 136                 return -ENOMEM;
 137
 138         drm_dev->dev_private = private;
 139
 140         drm_mode_config_init(drm_dev);
 141
 142         rockchip_drm_mode_config_init(drm_dev);
 143
 144         dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 145                                       GFP_KERNEL);
 146         if (!dev->dma_parms) {
 147                 ret = -ENOMEM;
 148                 goto err_config_cleanup;
 149         }
 150
 151         /* TODO(djkurtz): fetch the mapping start/size from somewhere */
 152         mapping = arm_iommu_create_mapping(&platform_bus_type, 0x00000000,
 153                                            SZ_2G);
 154         if (IS_ERR(mapping)) {
 155                 ret = PTR_ERR(mapping);
 156                 goto err_config_cleanup;
 157         }
 158
 159         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 160         if (ret)
 161                 goto err_release_mapping;
 162
 163         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 164
 165         ret = arm_iommu_attach_device(dev, mapping);
 166         if (ret)
 167                 goto err_release_mapping;
 168
 169         /* Try to bind all sub drivers. */
 170         ret = component_bind_all(dev, drm_dev);
 171         if (ret)
 172                 goto err_detach_device;
 173
 174         /* init kms poll for handling hpd */
 175         drm_kms_helper_poll_init(drm_dev);
 176
 177         /*
 178          * enable drm irq mode.
 179          * - with irq_enabled = true, we can use the vblank feature.
 180          */
 181         drm_dev->irq_enabled = true;
 182
 183         ret = drm_vblank_init(drm_dev, ROCKCHIP_MAX_CRTC);
 184         if (ret)
 185                 goto err_kms_helper_poll_fini;
 186
 187         /*
 188          * with vblank_disable_allowed = true, vblank interrupt will be disabled
 189          * by drm timer once a current process gives up ownership of
 190          * vblank event.(after drm_vblank_put function is called)
 191          */
 192         drm_dev->vblank_disable_allowed = true;
 193
 194         ret = rockchip_drm_fbdev_init(drm_dev);
 195         if (ret)
 196                 goto err_vblank_cleanup;
 197
 198         return 0;
 199 err_vblank_cleanup:
 200         drm_vblank_cleanup(drm_dev);
 201 err_kms_helper_poll_fini:
 202         drm_kms_helper_poll_fini(drm_dev);
 203         component_unbind_all(dev, drm_dev);
 204 err_detach_device:
 205         arm_iommu_detach_device(dev);
 206 err_release_mapping:
 207         arm_iommu_release_mapping(dev->archdata.mapping);
 208 err_config_cleanup:
 209         drm_mode_config_cleanup(drm_dev);
 210         drm_dev->dev_private = NULL;
 211         return ret;
 212 }
 213
 214 static int rockchip_drm_unload(struct drm_device *drm_dev)
 215 {
 216         struct device *dev = drm_dev->dev;
 217
 218         rockchip_drm_fbdev_fini(drm_dev);
 219         drm_vblank_cleanup(drm_dev);
 220         drm_kms_helper_poll_fini(drm_dev);
 221         component_unbind_all(dev, drm_dev);
 222         arm_iommu_detach_device(dev);
 223         arm_iommu_release_mapping(dev->archdata.mapping);
 224         drm_mode_config_cleanup(drm_dev);
 225         drm_dev->dev_private = NULL;
 226
 227         return 0;
 228 }
 229
 230 void rockchip_drm_lastclose(struct drm_device *dev)
 231 {
 232         struct rockchip_drm_private *priv = dev->dev_private;
 233
 234         drm_fb_helper_restore_fbdev_mode_unlocked(&priv->fbdev_helper);
 235 }
 236
 237 static const struct file_operations rockchip_drm_driver_fops = {
 238         .owner = THIS_MODULE,
 239         .open = drm_open,
 240         .mmap = rockchip_gem_mmap,
 241         .poll = drm_poll,
 242         .read = drm_read,
 243         .unlocked_ioctl = drm_ioctl,
 244 #ifdef CONFIG_COMPAT
 245         .compat_ioctl = drm_compat_ioctl,
 246 #endif
 247         .release = drm_release,
 248 };
 249
 250 const struct vm_operations_struct rockchip_drm_vm_ops = {
 251         .open = drm_gem_vm_open,
 252         .close = drm_gem_vm_close,
 253 };
 254
 255 static struct drm_driver rockchip_drm_driver = {
 256         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 257         .load                   = rockchip_drm_load,
 258         .unload                 = rockchip_drm_unload,
 259         .lastclose              = rockchip_drm_lastclose,
 260         .get_vblank_counter     = drm_vblank_count,
 261         .enable_vblank          = rockchip_drm_crtc_enable_vblank,
 262         .disable_vblank         = rockchip_drm_crtc_disable_vblank,
 263         .gem_vm_ops             = &rockchip_drm_vm_ops,
 264         .gem_free_object        = rockchip_gem_free_object,
 265         .dumb_create            = rockchip_gem_dumb_create,
 266         .dumb_map_offset        = rockchip_gem_dumb_map_offset,
 267         .dumb_destroy           = drm_gem_dumb_destroy,
 268         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 269         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 270         .gem_prime_import       = drm_gem_prime_import,
 271         .gem_prime_export       = drm_gem_prime_export,
 272         .gem_prime_get_sg_table = rockchip_gem_prime_get_sg_table,
 273         .gem_prime_vmap         = rockchip_gem_prime_vmap,
 274         .gem_prime_vunmap       = rockchip_gem_prime_vunmap,
 275         .gem_prime_mmap         = rockchip_gem_mmap_buf,
 276         .fops                   = &rockchip_drm_driver_fops,
 277         .name   = DRIVER_NAME,
 278         .desc   = DRIVER_DESC,
 279         .date   = DRIVER_DATE,
 280         .major  = DRIVER_MAJOR,
 281         .minor  = DRIVER_MINOR,
 282 };
 283
 284 #ifdef CONFIG_PM_SLEEP
 285 static int rockchip_drm_sys_suspend(struct device *dev)
 286 {
 287         struct drm_device *drm = dev_get_drvdata(dev);
 288         struct drm_connector *connector;
 289
 290         if (!drm)
 291                 return 0;
 292
 293         drm_modeset_lock_all(drm);
 294         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 295                 int old_dpms = connector->dpms;
 296
 297                 if (connector->funcs->dpms)
 298                         connector->funcs->dpms(connector, DRM_MODE_DPMS_OFF);
 299
 300                 /* Set the old mode back to the connector for resume */
 301                 connector->dpms = old_dpms;
 302         }
 303         drm_modeset_unlock_all(drm);
 304
 305         return 0;
 306 }
 307
 308 static int rockchip_drm_sys_resume(struct device *dev)
 309 {
 310         struct drm_device *drm = dev_get_drvdata(dev);
 311         struct drm_connector *connector;
 312         enum drm_connector_status status;
 313         bool changed = false;
 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 desired_mode = connector->dpms;
 321
 322                 /*
 323                  * at suspend time, we save dpms to connector->dpms,
 324                  * restore the old_dpms, and at current time, the connector
 325                  * dpms status must be DRM_MODE_DPMS_OFF.
 326                  */
 327                 connector->dpms = DRM_MODE_DPMS_OFF;
 328
 329                 /*
 330                  * If the connector has been disconnected during suspend,
 331                  * disconnect it from the encoder and leave it off. We'll notify
 332                  * userspace at the end.
 333                  */
 334                 if (desired_mode == DRM_MODE_DPMS_ON) {
 335                         status = connector->funcs->detect(connector, true);
 336                         if (status == connector_status_disconnected) {
 337                                 connector->encoder = NULL;
 338                                 connector->status = status;
 339                                 changed = true;
 340                                 continue;
 341                         }
 342                 }
 343                 if (connector->funcs->dpms)
 344                         connector->funcs->dpms(connector, desired_mode);
 345         }
 346         drm_modeset_unlock_all(drm);
 347
 348         drm_helper_resume_force_mode(drm);
 349
 350         if (changed)
 351                 drm_kms_helper_hotplug_event(drm);
 352
 353         return 0;
 354 }
 355 #endif
 356
 357 static const struct dev_pm_ops rockchip_drm_pm_ops = {
 358         SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend,
 359                                 rockchip_drm_sys_resume)
 360 };
 361
 362 /*
 363  * @node: device tree node containing encoder input ports
 364  * @encoder: drm_encoder
 365  */
 366 int rockchip_drm_encoder_get_mux_id(struct device_node *node,
 367                                     struct drm_encoder *encoder)
 368 {
 369         struct device_node *ep = NULL;
 370         struct drm_crtc *crtc = encoder->crtc;
 371         struct of_endpoint endpoint;
 372         struct device_node *port;
 373         int ret;
 374
 375         if (!node || !crtc)
 376                 return -EINVAL;
 377
 378         do {
 379                 ep = of_graph_get_next_endpoint(node, ep);
 380                 if (!ep)
 381                         break;
 382
 383                 port = of_graph_get_remote_port(ep);
 384                 of_node_put(port);
 385                 if (port == crtc->port) {
 386                         ret = of_graph_parse_endpoint(ep, &endpoint);
 387                         return ret ?: endpoint.id;
 388                 }
 389         } while (ep);
 390
 391         return -EINVAL;
 392 }
 393
 394 static int compare_of(struct device *dev, void *data)
 395 {
 396         struct device_node *np = data;
 397
 398         return dev->of_node == np;
 399 }
 400
 401 static void rockchip_add_endpoints(struct device *dev,
 402                                    struct component_match **match,
 403                                    struct device_node *port)
 404 {
 405         struct device_node *ep, *remote;
 406
 407         for_each_child_of_node(port, ep) {
 408                 remote = of_graph_get_remote_port_parent(ep);
 409                 if (!remote || !of_device_is_available(remote)) {
 410                         of_node_put(remote);
 411                         continue;
 412                 } else if (!of_device_is_available(remote->parent)) {
 413                         dev_warn(dev, "parent device of %s is not available\n",
 414                                  remote->full_name);
 415                         of_node_put(remote);
 416                         continue;
 417                 }
 418
 419                 component_match_add(dev, match, compare_of, remote);
 420                 of_node_put(remote);
 421         }
 422 }
 423
 424 static int rockchip_drm_bind(struct device *dev)
 425 {
 426         struct drm_device *drm;
 427         int ret;
 428
 429         drm = drm_dev_alloc(&rockchip_drm_driver, dev);
 430         if (!drm)
 431                 return -ENOMEM;
 432
 433         ret = drm_dev_set_unique(drm, "%s", dev_name(dev));
 434         if (ret)
 435                 goto err_free;
 436
 437         ret = drm_dev_register(drm, 0);
 438         if (ret)
 439                 goto err_free;
 440
 441         dev_set_drvdata(dev, drm);
 442
 443         return 0;
 444
 445 err_free:
 446         drm_dev_unref(drm);
 447         return ret;
 448 }
 449
 450 static void rockchip_drm_unbind(struct device *dev)
 451 {
 452         struct drm_device *drm = dev_get_drvdata(dev);
 453
 454         drm_dev_unregister(drm);
 455         drm_dev_unref(drm);
 456         dev_set_drvdata(dev, NULL);
 457 }
 458
 459 static const struct component_master_ops rockchip_drm_ops = {
 460         .bind = rockchip_drm_bind,
 461         .unbind = rockchip_drm_unbind,
 462 };
 463
 464 static int rockchip_drm_platform_probe(struct platform_device *pdev)
 465 {
 466         struct device *dev = &pdev->dev;
 467         struct component_match *match = NULL;
 468         struct device_node *np = dev->of_node;
 469         struct device_node *port;
 470         int i;
 471
 472         if (!np)
 473                 return -ENODEV;
 474         /*
 475          * Bind the crtc ports first, so that
 476          * drm_of_find_possible_crtcs called from encoder .bind callbacks
 477          * works as expected.
 478          */
 479         for (i = 0;; i++) {
 480                 port = of_parse_phandle(np, "ports", i);
 481                 if (!port)
 482                         break;
 483
 484                 if (!of_device_is_available(port->parent)) {
 485                         of_node_put(port);
 486                         continue;
 487                 }
 488
 489                 component_match_add(dev, &match, compare_of, port->parent);
 490                 of_node_put(port);
 491         }
 492
 493         if (i == 0) {
 494                 dev_err(dev, "missing 'ports' property\n");
 495                 return -ENODEV;
 496         }
 497
 498         if (!match) {
 499                 dev_err(dev, "No available vop found for display-subsystem.\n");
 500                 return -ENODEV;
 501         }
 502         /*
 503          * For each bound crtc, bind the encoders attached to its
 504          * remote endpoint.
 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                 rockchip_add_endpoints(dev, &match, port);
 517                 of_node_put(port);
 518         }
 519
 520         return component_master_add_with_match(dev, &rockchip_drm_ops, match);
 521 }
 522
 523 static int rockchip_drm_platform_remove(struct platform_device *pdev)
 524 {
 525         component_master_del(&pdev->dev, &rockchip_drm_ops);
 526
 527         return 0;
 528 }
 529
 530 static const struct of_device_id rockchip_drm_dt_ids[] = {
 531         { .compatible = "rockchip,display-subsystem", },
 532         { /* sentinel */ },
 533 };
 534 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
 535
 536 static struct platform_driver rockchip_drm_platform_driver = {
 537         .probe = rockchip_drm_platform_probe,
 538         .remove = rockchip_drm_platform_remove,
 539         .driver = {
 540                 .owner = THIS_MODULE,
 541                 .name = "rockchip-drm",
 542                 .of_match_table = rockchip_drm_dt_ids,
 543                 .pm = &rockchip_drm_pm_ops,
 544         },
 545 };
 546
 547 module_platform_driver(rockchip_drm_platform_driver);
 548
 549 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
 550 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
 551 MODULE_LICENSE("GPL v2");