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