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