1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd 4 * Author:Mark Yao <mark.yao@rock-chips.com> 5 * 6 * based on exynos_drm_drv.c 7 */ 8 9 #include <linux/aperture.h> 10 #include <linux/dma-mapping.h> 11 #include <linux/platform_device.h> 12 #include <linux/pm_runtime.h> 13 #include <linux/module.h> 14 #include <linux/of_graph.h> 15 #include <linux/of_platform.h> 16 #include <linux/component.h> 17 #include <linux/console.h> 18 #include <linux/iommu.h> 19 20 #include <drm/drm_client_setup.h> 21 #include <drm/drm_drv.h> 22 #include <drm/drm_fbdev_dma.h> 23 #include <drm/drm_gem_dma_helper.h> 24 #include <drm/drm_of.h> 25 #include <drm/drm_probe_helper.h> 26 #include <drm/drm_vblank.h> 27 28 #if defined(CONFIG_ARM_DMA_USE_IOMMU) 29 #include <asm/dma-iommu.h> 30 #else 31 #define arm_iommu_detach_device(...) ({ }) 32 #define arm_iommu_release_mapping(...) ({ }) 33 #define to_dma_iommu_mapping(dev) NULL 34 #endif 35 36 #include "rockchip_drm_drv.h" 37 #include "rockchip_drm_fb.h" 38 #include "rockchip_drm_gem.h" 39 40 #define DRIVER_NAME "rockchip" 41 #define DRIVER_DESC "RockChip Soc DRM" 42 #define DRIVER_DATE "20140818" 43 #define DRIVER_MAJOR 1 44 #define DRIVER_MINOR 0 45 46 static const struct drm_driver rockchip_drm_driver; 47 48 /* 49 * Attach a (component) device to the shared drm dma mapping from master drm 50 * device. This is used by the VOPs to map GEM buffers to a common DMA 51 * mapping. 52 */ 53 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev, 54 struct device *dev) 55 { 56 struct rockchip_drm_private *private = drm_dev->dev_private; 57 int ret; 58 59 if (!private->domain) 60 return 0; 61 62 if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) { 63 struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev); 64 65 if (mapping) { 66 arm_iommu_detach_device(dev); 67 arm_iommu_release_mapping(mapping); 68 } 69 } 70 71 ret = iommu_attach_device(private->domain, dev); 72 if (ret) { 73 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n"); 74 return ret; 75 } 76 77 return 0; 78 } 79 80 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev, 81 struct device *dev) 82 { 83 struct rockchip_drm_private *private = drm_dev->dev_private; 84 85 if (!private->domain) 86 return; 87 88 iommu_detach_device(private->domain, dev); 89 } 90 91 void rockchip_drm_dma_init_device(struct drm_device *drm_dev, 92 struct device *dev) 93 { 94 struct rockchip_drm_private *private = drm_dev->dev_private; 95 96 if (!device_iommu_mapped(dev)) 97 private->iommu_dev = ERR_PTR(-ENODEV); 98 else if (!private->iommu_dev) 99 private->iommu_dev = dev; 100 } 101 102 static int rockchip_drm_init_iommu(struct drm_device *drm_dev) 103 { 104 struct rockchip_drm_private *private = drm_dev->dev_private; 105 struct iommu_domain_geometry *geometry; 106 u64 start, end; 107 int ret; 108 109 if (IS_ERR_OR_NULL(private->iommu_dev)) 110 return 0; 111 112 private->domain = iommu_paging_domain_alloc(private->iommu_dev); 113 if (IS_ERR(private->domain)) { 114 ret = PTR_ERR(private->domain); 115 private->domain = NULL; 116 return ret; 117 } 118 119 geometry = &private->domain->geometry; 120 start = geometry->aperture_start; 121 end = geometry->aperture_end; 122 123 DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n", 124 start, end); 125 drm_mm_init(&private->mm, start, end - start + 1); 126 mutex_init(&private->mm_lock); 127 128 return 0; 129 } 130 131 static void rockchip_iommu_cleanup(struct drm_device *drm_dev) 132 { 133 struct rockchip_drm_private *private = drm_dev->dev_private; 134 135 if (!private->domain) 136 return; 137 138 drm_mm_takedown(&private->mm); 139 iommu_domain_free(private->domain); 140 } 141 142 static int rockchip_drm_bind(struct device *dev) 143 { 144 struct drm_device *drm_dev; 145 struct rockchip_drm_private *private; 146 int ret; 147 148 /* Remove existing drivers that may own the framebuffer memory. */ 149 ret = aperture_remove_all_conflicting_devices(rockchip_drm_driver.name); 150 if (ret) { 151 DRM_DEV_ERROR(dev, 152 "Failed to remove existing framebuffers - %d.\n", 153 ret); 154 return ret; 155 } 156 157 drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev); 158 if (IS_ERR(drm_dev)) 159 return PTR_ERR(drm_dev); 160 161 dev_set_drvdata(dev, drm_dev); 162 163 private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL); 164 if (!private) { 165 ret = -ENOMEM; 166 goto err_free; 167 } 168 169 drm_dev->dev_private = private; 170 171 ret = drmm_mode_config_init(drm_dev); 172 if (ret) 173 goto err_free; 174 175 rockchip_drm_mode_config_init(drm_dev); 176 177 /* Try to bind all sub drivers. */ 178 ret = component_bind_all(dev, drm_dev); 179 if (ret) 180 goto err_free; 181 182 ret = rockchip_drm_init_iommu(drm_dev); 183 if (ret) 184 goto err_unbind_all; 185 186 ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc); 187 if (ret) 188 goto err_iommu_cleanup; 189 190 drm_mode_config_reset(drm_dev); 191 192 /* init kms poll for handling hpd */ 193 drm_kms_helper_poll_init(drm_dev); 194 195 ret = drm_dev_register(drm_dev, 0); 196 if (ret) 197 goto err_kms_helper_poll_fini; 198 199 drm_client_setup(drm_dev, NULL); 200 201 return 0; 202 err_kms_helper_poll_fini: 203 drm_kms_helper_poll_fini(drm_dev); 204 err_iommu_cleanup: 205 rockchip_iommu_cleanup(drm_dev); 206 err_unbind_all: 207 component_unbind_all(dev, drm_dev); 208 err_free: 209 drm_dev_put(drm_dev); 210 return ret; 211 } 212 213 static void rockchip_drm_unbind(struct device *dev) 214 { 215 struct drm_device *drm_dev = dev_get_drvdata(dev); 216 217 drm_dev_unregister(drm_dev); 218 219 drm_kms_helper_poll_fini(drm_dev); 220 221 drm_atomic_helper_shutdown(drm_dev); 222 component_unbind_all(dev, drm_dev); 223 rockchip_iommu_cleanup(drm_dev); 224 225 drm_dev_put(drm_dev); 226 } 227 228 DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops); 229 230 static const struct drm_driver rockchip_drm_driver = { 231 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 232 .dumb_create = rockchip_gem_dumb_create, 233 .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table, 234 DRM_FBDEV_DMA_DRIVER_OPS, 235 .fops = &rockchip_drm_driver_fops, 236 .name = DRIVER_NAME, 237 .desc = DRIVER_DESC, 238 .date = DRIVER_DATE, 239 .major = DRIVER_MAJOR, 240 .minor = DRIVER_MINOR, 241 }; 242 243 #ifdef CONFIG_PM_SLEEP 244 static int rockchip_drm_sys_suspend(struct device *dev) 245 { 246 struct drm_device *drm = dev_get_drvdata(dev); 247 248 return drm_mode_config_helper_suspend(drm); 249 } 250 251 static int rockchip_drm_sys_resume(struct device *dev) 252 { 253 struct drm_device *drm = dev_get_drvdata(dev); 254 255 return drm_mode_config_helper_resume(drm); 256 } 257 #endif 258 259 static const struct dev_pm_ops rockchip_drm_pm_ops = { 260 SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend, 261 rockchip_drm_sys_resume) 262 }; 263 264 #define MAX_ROCKCHIP_SUB_DRIVERS 16 265 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS]; 266 static int num_rockchip_sub_drivers; 267 268 /* 269 * Get the endpoint id of the remote endpoint of the given encoder. This 270 * information is used by the VOP2 driver to identify the encoder. 271 * 272 * @rkencoder: The encoder to get the remote endpoint id from 273 * @np: The encoder device node 274 * @port: The number of the port leading to the VOP2 275 * @reg: The endpoint number leading to the VOP2 276 */ 277 int rockchip_drm_encoder_set_crtc_endpoint_id(struct rockchip_encoder *rkencoder, 278 struct device_node *np, int port, int reg) 279 { 280 struct of_endpoint ep; 281 struct device_node *en, *ren; 282 int ret; 283 284 en = of_graph_get_endpoint_by_regs(np, port, reg); 285 if (!en) 286 return -ENOENT; 287 288 ren = of_graph_get_remote_endpoint(en); 289 if (!ren) 290 return -ENOENT; 291 292 ret = of_graph_parse_endpoint(ren, &ep); 293 if (ret) 294 return ret; 295 296 rkencoder->crtc_endpoint_id = ep.id; 297 298 return 0; 299 } 300 301 /* 302 * Check if a vop endpoint is leading to a rockchip subdriver or bridge. 303 * Should be called from the component bind stage of the drivers 304 * to ensure that all subdrivers are probed. 305 * 306 * @ep: endpoint of a rockchip vop 307 * 308 * returns true if subdriver, false if external bridge and -ENODEV 309 * if remote port does not contain a device. 310 */ 311 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep) 312 { 313 struct device_node *node = of_graph_get_remote_port_parent(ep); 314 struct platform_device *pdev; 315 struct device_driver *drv; 316 int i; 317 318 if (!node) 319 return -ENODEV; 320 321 /* status disabled will prevent creation of platform-devices */ 322 if (!of_device_is_available(node)) { 323 of_node_put(node); 324 return -ENODEV; 325 } 326 327 pdev = of_find_device_by_node(node); 328 of_node_put(node); 329 330 /* enabled non-platform-devices can immediately return here */ 331 if (!pdev) 332 return false; 333 334 /* 335 * All rockchip subdrivers have probed at this point, so 336 * any device not having a driver now is an external bridge. 337 */ 338 drv = pdev->dev.driver; 339 if (!drv) { 340 platform_device_put(pdev); 341 return false; 342 } 343 344 for (i = 0; i < num_rockchip_sub_drivers; i++) { 345 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) { 346 platform_device_put(pdev); 347 return true; 348 } 349 } 350 351 platform_device_put(pdev); 352 return false; 353 } 354 355 static void rockchip_drm_match_remove(struct device *dev) 356 { 357 struct device_link *link; 358 359 list_for_each_entry(link, &dev->links.consumers, s_node) 360 device_link_del(link); 361 } 362 363 /* list of preferred vop devices */ 364 static const char *const rockchip_drm_match_preferred[] = { 365 "rockchip,rk3399-vop-big", 366 NULL, 367 }; 368 369 static struct component_match *rockchip_drm_match_add(struct device *dev) 370 { 371 struct component_match *match = NULL; 372 struct device_node *port; 373 int i; 374 375 /* add preferred vop device match before adding driver device matches */ 376 for (i = 0; ; i++) { 377 port = of_parse_phandle(dev->of_node, "ports", i); 378 if (!port) 379 break; 380 381 if (of_device_is_available(port->parent) && 382 of_device_compatible_match(port->parent, 383 rockchip_drm_match_preferred)) 384 drm_of_component_match_add(dev, &match, 385 component_compare_of, 386 port->parent); 387 388 of_node_put(port); 389 } 390 391 for (i = 0; i < num_rockchip_sub_drivers; i++) { 392 struct platform_driver *drv = rockchip_sub_drivers[i]; 393 struct device *p = NULL, *d; 394 395 do { 396 d = platform_find_device_by_driver(p, &drv->driver); 397 put_device(p); 398 p = d; 399 400 if (!d) 401 break; 402 403 device_link_add(dev, d, DL_FLAG_STATELESS); 404 component_match_add(dev, &match, component_compare_dev, d); 405 } while (true); 406 } 407 408 if (IS_ERR(match)) 409 rockchip_drm_match_remove(dev); 410 411 return match ?: ERR_PTR(-ENODEV); 412 } 413 414 static const struct component_master_ops rockchip_drm_ops = { 415 .bind = rockchip_drm_bind, 416 .unbind = rockchip_drm_unbind, 417 }; 418 419 static int rockchip_drm_platform_of_probe(struct device *dev) 420 { 421 struct device_node *np = dev->of_node; 422 struct device_node *port; 423 bool found = false; 424 int i; 425 426 if (!np) 427 return -ENODEV; 428 429 for (i = 0;; i++) { 430 port = of_parse_phandle(np, "ports", i); 431 if (!port) 432 break; 433 434 if (!of_device_is_available(port->parent)) { 435 of_node_put(port); 436 continue; 437 } 438 439 found = true; 440 of_node_put(port); 441 } 442 443 if (i == 0) { 444 DRM_DEV_ERROR(dev, "missing 'ports' property\n"); 445 return -ENODEV; 446 } 447 448 if (!found) { 449 DRM_DEV_ERROR(dev, 450 "No available vop found for display-subsystem.\n"); 451 return -ENODEV; 452 } 453 454 return 0; 455 } 456 457 static int rockchip_drm_platform_probe(struct platform_device *pdev) 458 { 459 struct device *dev = &pdev->dev; 460 struct component_match *match = NULL; 461 int ret; 462 463 ret = rockchip_drm_platform_of_probe(dev); 464 if (ret) 465 return ret; 466 467 match = rockchip_drm_match_add(dev); 468 if (IS_ERR(match)) 469 return PTR_ERR(match); 470 471 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match); 472 if (ret < 0) { 473 rockchip_drm_match_remove(dev); 474 return ret; 475 } 476 477 return 0; 478 } 479 480 static void rockchip_drm_platform_remove(struct platform_device *pdev) 481 { 482 component_master_del(&pdev->dev, &rockchip_drm_ops); 483 484 rockchip_drm_match_remove(&pdev->dev); 485 } 486 487 static void rockchip_drm_platform_shutdown(struct platform_device *pdev) 488 { 489 struct drm_device *drm = platform_get_drvdata(pdev); 490 491 if (drm) 492 drm_atomic_helper_shutdown(drm); 493 } 494 495 static const struct of_device_id rockchip_drm_dt_ids[] = { 496 { .compatible = "rockchip,display-subsystem", }, 497 { /* sentinel */ }, 498 }; 499 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids); 500 501 static struct platform_driver rockchip_drm_platform_driver = { 502 .probe = rockchip_drm_platform_probe, 503 .remove = rockchip_drm_platform_remove, 504 .shutdown = rockchip_drm_platform_shutdown, 505 .driver = { 506 .name = "rockchip-drm", 507 .of_match_table = rockchip_drm_dt_ids, 508 .pm = &rockchip_drm_pm_ops, 509 }, 510 }; 511 512 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \ 513 if (IS_ENABLED(cond) && \ 514 !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \ 515 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \ 516 } 517 518 static int __init rockchip_drm_init(void) 519 { 520 int ret; 521 522 if (drm_firmware_drivers_only()) 523 return -ENODEV; 524 525 num_rockchip_sub_drivers = 0; 526 ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_ROCKCHIP_VOP); 527 ADD_ROCKCHIP_SUB_DRIVER(vop2_platform_driver, CONFIG_ROCKCHIP_VOP2); 528 ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver, 529 CONFIG_ROCKCHIP_LVDS); 530 ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver, 531 CONFIG_ROCKCHIP_ANALOGIX_DP); 532 ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP); 533 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver, 534 CONFIG_ROCKCHIP_DW_HDMI); 535 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_qp_rockchip_pltfm_driver, 536 CONFIG_ROCKCHIP_DW_HDMI_QP); 537 ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver, 538 CONFIG_ROCKCHIP_DW_MIPI_DSI); 539 ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI); 540 ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver, 541 CONFIG_ROCKCHIP_RK3066_HDMI); 542 543 ret = platform_register_drivers(rockchip_sub_drivers, 544 num_rockchip_sub_drivers); 545 if (ret) 546 return ret; 547 548 ret = platform_driver_register(&rockchip_drm_platform_driver); 549 if (ret) 550 goto err_unreg_drivers; 551 552 return 0; 553 554 err_unreg_drivers: 555 platform_unregister_drivers(rockchip_sub_drivers, 556 num_rockchip_sub_drivers); 557 return ret; 558 } 559 560 static void __exit rockchip_drm_fini(void) 561 { 562 platform_driver_unregister(&rockchip_drm_platform_driver); 563 564 platform_unregister_drivers(rockchip_sub_drivers, 565 num_rockchip_sub_drivers); 566 } 567 568 module_init(rockchip_drm_init); 569 module_exit(rockchip_drm_fini); 570 571 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>"); 572 MODULE_DESCRIPTION("ROCKCHIP DRM Driver"); 573 MODULE_LICENSE("GPL v2"); 574