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