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_driver); 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 ret = rockchip_drm_fbdev_init(drm_dev); 166 if (ret) 167 goto err_unbind_all; 168 169 /* init kms poll for handling hpd */ 170 drm_kms_helper_poll_init(drm_dev); 171 172 ret = drm_dev_register(drm_dev, 0); 173 if (ret) 174 goto err_kms_helper_poll_fini; 175 176 return 0; 177 err_kms_helper_poll_fini: 178 drm_kms_helper_poll_fini(drm_dev); 179 rockchip_drm_fbdev_fini(drm_dev); 180 err_unbind_all: 181 component_unbind_all(dev, drm_dev); 182 err_iommu_cleanup: 183 rockchip_iommu_cleanup(drm_dev); 184 err_free: 185 drm_dev_put(drm_dev); 186 return ret; 187 } 188 189 static void rockchip_drm_unbind(struct device *dev) 190 { 191 struct drm_device *drm_dev = dev_get_drvdata(dev); 192 193 drm_dev_unregister(drm_dev); 194 195 rockchip_drm_fbdev_fini(drm_dev); 196 drm_kms_helper_poll_fini(drm_dev); 197 198 drm_atomic_helper_shutdown(drm_dev); 199 component_unbind_all(dev, drm_dev); 200 rockchip_iommu_cleanup(drm_dev); 201 202 drm_dev_put(drm_dev); 203 } 204 205 static const struct file_operations rockchip_drm_driver_fops = { 206 .owner = THIS_MODULE, 207 .open = drm_open, 208 .mmap = rockchip_gem_mmap, 209 .poll = drm_poll, 210 .read = drm_read, 211 .unlocked_ioctl = drm_ioctl, 212 .compat_ioctl = drm_compat_ioctl, 213 .release = drm_release, 214 }; 215 216 static const struct drm_driver rockchip_drm_driver = { 217 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, 218 .lastclose = drm_fb_helper_lastclose, 219 .dumb_create = rockchip_gem_dumb_create, 220 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 221 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 222 .gem_prime_import_sg_table = rockchip_gem_prime_import_sg_table, 223 .gem_prime_mmap = rockchip_gem_mmap_buf, 224 .fops = &rockchip_drm_driver_fops, 225 .name = DRIVER_NAME, 226 .desc = DRIVER_DESC, 227 .date = DRIVER_DATE, 228 .major = DRIVER_MAJOR, 229 .minor = DRIVER_MINOR, 230 }; 231 232 #ifdef CONFIG_PM_SLEEP 233 static int rockchip_drm_sys_suspend(struct device *dev) 234 { 235 struct drm_device *drm = dev_get_drvdata(dev); 236 237 return drm_mode_config_helper_suspend(drm); 238 } 239 240 static int rockchip_drm_sys_resume(struct device *dev) 241 { 242 struct drm_device *drm = dev_get_drvdata(dev); 243 244 return drm_mode_config_helper_resume(drm); 245 } 246 #endif 247 248 static const struct dev_pm_ops rockchip_drm_pm_ops = { 249 SET_SYSTEM_SLEEP_PM_OPS(rockchip_drm_sys_suspend, 250 rockchip_drm_sys_resume) 251 }; 252 253 #define MAX_ROCKCHIP_SUB_DRIVERS 16 254 static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS]; 255 static int num_rockchip_sub_drivers; 256 257 /* 258 * Check if a vop endpoint is leading to a rockchip subdriver or bridge. 259 * Should be called from the component bind stage of the drivers 260 * to ensure that all subdrivers are probed. 261 * 262 * @ep: endpoint of a rockchip vop 263 * 264 * returns true if subdriver, false if external bridge and -ENODEV 265 * if remote port does not contain a device. 266 */ 267 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep) 268 { 269 struct device_node *node = of_graph_get_remote_port_parent(ep); 270 struct platform_device *pdev; 271 struct device_driver *drv; 272 int i; 273 274 if (!node) 275 return -ENODEV; 276 277 /* status disabled will prevent creation of platform-devices */ 278 pdev = of_find_device_by_node(node); 279 of_node_put(node); 280 if (!pdev) 281 return -ENODEV; 282 283 /* 284 * All rockchip subdrivers have probed at this point, so 285 * any device not having a driver now is an external bridge. 286 */ 287 drv = pdev->dev.driver; 288 if (!drv) { 289 platform_device_put(pdev); 290 return false; 291 } 292 293 for (i = 0; i < num_rockchip_sub_drivers; i++) { 294 if (rockchip_sub_drivers[i] == to_platform_driver(drv)) { 295 platform_device_put(pdev); 296 return true; 297 } 298 } 299 300 platform_device_put(pdev); 301 return false; 302 } 303 304 static int compare_dev(struct device *dev, void *data) 305 { 306 return dev == (struct device *)data; 307 } 308 309 static void rockchip_drm_match_remove(struct device *dev) 310 { 311 struct device_link *link; 312 313 list_for_each_entry(link, &dev->links.consumers, s_node) 314 device_link_del(link); 315 } 316 317 static struct component_match *rockchip_drm_match_add(struct device *dev) 318 { 319 struct component_match *match = NULL; 320 int i; 321 322 for (i = 0; i < num_rockchip_sub_drivers; i++) { 323 struct platform_driver *drv = rockchip_sub_drivers[i]; 324 struct device *p = NULL, *d; 325 326 do { 327 d = platform_find_device_by_driver(p, &drv->driver); 328 put_device(p); 329 p = d; 330 331 if (!d) 332 break; 333 334 device_link_add(dev, d, DL_FLAG_STATELESS); 335 component_match_add(dev, &match, compare_dev, d); 336 } while (true); 337 } 338 339 if (IS_ERR(match)) 340 rockchip_drm_match_remove(dev); 341 342 return match ?: ERR_PTR(-ENODEV); 343 } 344 345 static const struct component_master_ops rockchip_drm_ops = { 346 .bind = rockchip_drm_bind, 347 .unbind = rockchip_drm_unbind, 348 }; 349 350 static int rockchip_drm_platform_of_probe(struct device *dev) 351 { 352 struct device_node *np = dev->of_node; 353 struct device_node *port; 354 bool found = false; 355 int i; 356 357 if (!np) 358 return -ENODEV; 359 360 for (i = 0;; i++) { 361 struct device_node *iommu; 362 363 port = of_parse_phandle(np, "ports", i); 364 if (!port) 365 break; 366 367 if (!of_device_is_available(port->parent)) { 368 of_node_put(port); 369 continue; 370 } 371 372 iommu = of_parse_phandle(port->parent, "iommus", 0); 373 if (!iommu || !of_device_is_available(iommu->parent)) { 374 DRM_DEV_DEBUG(dev, 375 "no iommu attached for %pOF, using non-iommu buffers\n", 376 port->parent); 377 /* 378 * if there is a crtc not support iommu, force set all 379 * crtc use non-iommu buffer. 380 */ 381 is_support_iommu = false; 382 } 383 384 found = true; 385 386 of_node_put(iommu); 387 of_node_put(port); 388 } 389 390 if (i == 0) { 391 DRM_DEV_ERROR(dev, "missing 'ports' property\n"); 392 return -ENODEV; 393 } 394 395 if (!found) { 396 DRM_DEV_ERROR(dev, 397 "No available vop found for display-subsystem.\n"); 398 return -ENODEV; 399 } 400 401 return 0; 402 } 403 404 static int rockchip_drm_platform_probe(struct platform_device *pdev) 405 { 406 struct device *dev = &pdev->dev; 407 struct component_match *match = NULL; 408 int ret; 409 410 ret = rockchip_drm_platform_of_probe(dev); 411 if (ret) 412 return ret; 413 414 match = rockchip_drm_match_add(dev); 415 if (IS_ERR(match)) 416 return PTR_ERR(match); 417 418 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match); 419 if (ret < 0) { 420 rockchip_drm_match_remove(dev); 421 return ret; 422 } 423 424 return 0; 425 } 426 427 static int rockchip_drm_platform_remove(struct platform_device *pdev) 428 { 429 component_master_del(&pdev->dev, &rockchip_drm_ops); 430 431 rockchip_drm_match_remove(&pdev->dev); 432 433 return 0; 434 } 435 436 static void rockchip_drm_platform_shutdown(struct platform_device *pdev) 437 { 438 struct drm_device *drm = platform_get_drvdata(pdev); 439 440 if (drm) 441 drm_atomic_helper_shutdown(drm); 442 } 443 444 static const struct of_device_id rockchip_drm_dt_ids[] = { 445 { .compatible = "rockchip,display-subsystem", }, 446 { /* sentinel */ }, 447 }; 448 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids); 449 450 static struct platform_driver rockchip_drm_platform_driver = { 451 .probe = rockchip_drm_platform_probe, 452 .remove = rockchip_drm_platform_remove, 453 .shutdown = rockchip_drm_platform_shutdown, 454 .driver = { 455 .name = "rockchip-drm", 456 .of_match_table = rockchip_drm_dt_ids, 457 .pm = &rockchip_drm_pm_ops, 458 }, 459 }; 460 461 #define ADD_ROCKCHIP_SUB_DRIVER(drv, cond) { \ 462 if (IS_ENABLED(cond) && \ 463 !WARN_ON(num_rockchip_sub_drivers >= MAX_ROCKCHIP_SUB_DRIVERS)) \ 464 rockchip_sub_drivers[num_rockchip_sub_drivers++] = &drv; \ 465 } 466 467 static int __init rockchip_drm_init(void) 468 { 469 int ret; 470 471 num_rockchip_sub_drivers = 0; 472 ADD_ROCKCHIP_SUB_DRIVER(vop_platform_driver, CONFIG_DRM_ROCKCHIP); 473 ADD_ROCKCHIP_SUB_DRIVER(rockchip_lvds_driver, 474 CONFIG_ROCKCHIP_LVDS); 475 ADD_ROCKCHIP_SUB_DRIVER(rockchip_dp_driver, 476 CONFIG_ROCKCHIP_ANALOGIX_DP); 477 ADD_ROCKCHIP_SUB_DRIVER(cdn_dp_driver, CONFIG_ROCKCHIP_CDN_DP); 478 ADD_ROCKCHIP_SUB_DRIVER(dw_hdmi_rockchip_pltfm_driver, 479 CONFIG_ROCKCHIP_DW_HDMI); 480 ADD_ROCKCHIP_SUB_DRIVER(dw_mipi_dsi_rockchip_driver, 481 CONFIG_ROCKCHIP_DW_MIPI_DSI); 482 ADD_ROCKCHIP_SUB_DRIVER(inno_hdmi_driver, CONFIG_ROCKCHIP_INNO_HDMI); 483 ADD_ROCKCHIP_SUB_DRIVER(rk3066_hdmi_driver, 484 CONFIG_ROCKCHIP_RK3066_HDMI); 485 486 ret = platform_register_drivers(rockchip_sub_drivers, 487 num_rockchip_sub_drivers); 488 if (ret) 489 return ret; 490 491 ret = platform_driver_register(&rockchip_drm_platform_driver); 492 if (ret) 493 goto err_unreg_drivers; 494 495 return 0; 496 497 err_unreg_drivers: 498 platform_unregister_drivers(rockchip_sub_drivers, 499 num_rockchip_sub_drivers); 500 return ret; 501 } 502 503 static void __exit rockchip_drm_fini(void) 504 { 505 platform_driver_unregister(&rockchip_drm_platform_driver); 506 507 platform_unregister_drivers(rockchip_sub_drivers, 508 num_rockchip_sub_drivers); 509 } 510 511 module_init(rockchip_drm_init); 512 module_exit(rockchip_drm_fini); 513 514 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>"); 515 MODULE_DESCRIPTION("ROCKCHIP DRM Driver"); 516 MODULE_LICENSE("GPL v2"); 517