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