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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd4 * Author:Mark Yao <mark.yao@rock-chips.com>5 *6 * based on exynos_drm_drv.c7 */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#else30#define arm_iommu_detach_device(...) ({ })31#define arm_iommu_release_mapping(...) ({ })32#define to_dma_iommu_mapping(dev) NULL33#endif34 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 143#define DRIVER_MINOR 044 45static const struct drm_driver rockchip_drm_driver;46 47/*48 * Attach a (component) device to the shared drm dma mapping from master drm49 * device. This is used by the VOPs to map GEM buffers to a common DMA50 * mapping.51 */52int 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 79void 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 90void 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 101static 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 130static 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 141static 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;201err_kms_helper_poll_fini:202 drm_kms_helper_poll_fini(drm_dev);203err_iommu_cleanup:204 rockchip_iommu_cleanup(drm_dev);205err_unbind_all:206 component_unbind_all(dev, drm_dev);207err_free:208 drm_dev_put(drm_dev);209 return ret;210}211 212static 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 227DEFINE_DRM_GEM_FOPS(rockchip_drm_driver_fops);228 229static 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_SLEEP242static 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 249static 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#endif256 257static 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 16263static struct platform_driver *rockchip_sub_drivers[MAX_ROCKCHIP_SUB_DRIVERS];264static int num_rockchip_sub_drivers;265 266/*267 * Get the endpoint id of the remote endpoint of the given encoder. This268 * information is used by the VOP2 driver to identify the encoder.269 *270 * @rkencoder: The encoder to get the remote endpoint id from271 * @np: The encoder device node272 * @port: The number of the port leading to the VOP2273 * @reg: The endpoint number leading to the VOP2274 */275int 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 drivers302 * to ensure that all subdrivers are probed.303 *304 * @ep: endpoint of a rockchip vop305 *306 * returns true if subdriver, false if external bridge and -ENODEV307 * if remote port does not contain a device.308 */309int 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, so334 * 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 353static 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 361static 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 389static const struct component_master_ops rockchip_drm_ops = {390 .bind = rockchip_drm_bind,391 .unbind = rockchip_drm_unbind,392};393 394static 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 432static 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 455static 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 462static 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 470static const struct of_device_id rockchip_drm_dt_ids[] = {471 { .compatible = "rockchip,display-subsystem", },472 { /* sentinel */ },473};474MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);475 476static 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 493static 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 527err_unreg_drivers:528 platform_unregister_drivers(rockchip_sub_drivers,529 num_rockchip_sub_drivers);530 return ret;531}532 533static 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 541module_init(rockchip_drm_init);542module_exit(rockchip_drm_fini);543 544MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");545MODULE_DESCRIPTION("ROCKCHIP DRM Driver");546MODULE_LICENSE("GPL v2");547