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_register(drm, 0); 457 if (ret) 458 goto err_free; 459 460 dev_set_drvdata(dev, drm); 461 462 return 0; 463 464 err_free: 465 drm_dev_unref(drm); 466 return ret; 467 } 468 469 static void rockchip_drm_unbind(struct device *dev) 470 { 471 struct drm_device *drm = dev_get_drvdata(dev); 472 473 drm_dev_unregister(drm); 474 drm_dev_unref(drm); 475 dev_set_drvdata(dev, NULL); 476 } 477 478 static const struct component_master_ops rockchip_drm_ops = { 479 .bind = rockchip_drm_bind, 480 .unbind = rockchip_drm_unbind, 481 }; 482 483 static int rockchip_drm_platform_probe(struct platform_device *pdev) 484 { 485 struct device *dev = &pdev->dev; 486 struct component_match *match = NULL; 487 struct device_node *np = dev->of_node; 488 struct device_node *port; 489 int i; 490 491 if (!np) 492 return -ENODEV; 493 /* 494 * Bind the crtc ports first, so that 495 * drm_of_find_possible_crtcs called from encoder .bind callbacks 496 * works as expected. 497 */ 498 for (i = 0;; i++) { 499 port = of_parse_phandle(np, "ports", i); 500 if (!port) 501 break; 502 503 if (!of_device_is_available(port->parent)) { 504 of_node_put(port); 505 continue; 506 } 507 508 component_match_add(dev, &match, compare_of, port->parent); 509 of_node_put(port); 510 } 511 512 if (i == 0) { 513 dev_err(dev, "missing 'ports' property\n"); 514 return -ENODEV; 515 } 516 517 if (!match) { 518 dev_err(dev, "No available vop found for display-subsystem.\n"); 519 return -ENODEV; 520 } 521 /* 522 * For each bound crtc, bind the encoders attached to its 523 * remote endpoint. 524 */ 525 for (i = 0;; i++) { 526 port = of_parse_phandle(np, "ports", i); 527 if (!port) 528 break; 529 530 if (!of_device_is_available(port->parent)) { 531 of_node_put(port); 532 continue; 533 } 534 535 rockchip_add_endpoints(dev, &match, port); 536 of_node_put(port); 537 } 538 539 return component_master_add_with_match(dev, &rockchip_drm_ops, match); 540 } 541 542 static int rockchip_drm_platform_remove(struct platform_device *pdev) 543 { 544 component_master_del(&pdev->dev, &rockchip_drm_ops); 545 546 return 0; 547 } 548 549 static const struct of_device_id rockchip_drm_dt_ids[] = { 550 { .compatible = "rockchip,display-subsystem", }, 551 { /* sentinel */ }, 552 }; 553 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids); 554 555 static struct platform_driver rockchip_drm_platform_driver = { 556 .probe = rockchip_drm_platform_probe, 557 .remove = rockchip_drm_platform_remove, 558 .driver = { 559 .name = "rockchip-drm", 560 .of_match_table = rockchip_drm_dt_ids, 561 .pm = &rockchip_drm_pm_ops, 562 }, 563 }; 564 565 module_platform_driver(rockchip_drm_platform_driver); 566 567 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>"); 568 MODULE_DESCRIPTION("ROCKCHIP DRM Driver"); 569 MODULE_LICENSE("GPL v2"); 570