1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
4 * Author:Mark Yao <mark.yao@rock-chips.com>
6 * based on exynos_drm_drv.c
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>
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>
27 #include "rockchip_drm_drv.h"
28 #include "rockchip_drm_fb.h"
29 #include "rockchip_drm_fbdev.h"
30 #include "rockchip_drm_gem.h"
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
38 static bool is_support_iommu = true;
39 static const struct drm_driver rockchip_drm_driver;
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
46 int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
49 struct rockchip_drm_private *private = drm_dev->dev_private;
52 if (!is_support_iommu)
55 ret = iommu_attach_device(private->domain, dev);
57 DRM_DEV_ERROR(dev, "Failed to attach iommu device\n");
64 void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
67 struct rockchip_drm_private *private = drm_dev->dev_private;
68 struct iommu_domain *domain = private->domain;
70 if (!is_support_iommu)
73 iommu_detach_device(domain, dev);
76 static int rockchip_drm_init_iommu(struct drm_device *drm_dev)
78 struct rockchip_drm_private *private = drm_dev->dev_private;
79 struct iommu_domain_geometry *geometry;
82 if (!is_support_iommu)
85 private->domain = iommu_domain_alloc(&platform_bus_type);
89 geometry = &private->domain->geometry;
90 start = geometry->aperture_start;
91 end = geometry->aperture_end;
93 DRM_DEBUG("IOMMU context initialized (aperture: %#llx-%#llx)\n",
95 drm_mm_init(&private->mm, start, end - start + 1);
96 mutex_init(&private->mm_lock);
101 static void rockchip_iommu_cleanup(struct drm_device *drm_dev)
103 struct rockchip_drm_private *private = drm_dev->dev_private;
105 if (!is_support_iommu)
108 drm_mm_takedown(&private->mm);
109 iommu_domain_free(private->domain);
112 static int rockchip_drm_bind(struct device *dev)
114 struct drm_device *drm_dev;
115 struct rockchip_drm_private *private;
118 /* Remove existing drivers that may own the framebuffer memory. */
119 ret = drm_aperture_remove_framebuffers(false, &rockchip_drm_driver);
122 "Failed to remove existing framebuffers - %d.\n",
127 drm_dev = drm_dev_alloc(&rockchip_drm_driver, dev);
129 return PTR_ERR(drm_dev);
131 dev_set_drvdata(dev, drm_dev);
133 private = devm_kzalloc(drm_dev->dev, sizeof(*private), GFP_KERNEL);
139 drm_dev->dev_private = private;
141 INIT_LIST_HEAD(&private->psr_list);
142 mutex_init(&private->psr_list_lock);
144 ret = rockchip_drm_init_iommu(drm_dev);
148 ret = drmm_mode_config_init(drm_dev);
150 goto err_iommu_cleanup;
152 rockchip_drm_mode_config_init(drm_dev);
154 /* Try to bind all sub drivers. */
155 ret = component_bind_all(dev, drm_dev);
157 goto err_iommu_cleanup;
159 ret = drm_vblank_init(drm_dev, drm_dev->mode_config.num_crtc);
163 drm_mode_config_reset(drm_dev);
165 ret = rockchip_drm_fbdev_init(drm_dev);
169 /* init kms poll for handling hpd */
170 drm_kms_helper_poll_init(drm_dev);
172 ret = drm_dev_register(drm_dev, 0);
174 goto err_kms_helper_poll_fini;
177 err_kms_helper_poll_fini:
178 drm_kms_helper_poll_fini(drm_dev);
179 rockchip_drm_fbdev_fini(drm_dev);
181 component_unbind_all(dev, drm_dev);
183 rockchip_iommu_cleanup(drm_dev);
185 drm_dev_put(drm_dev);
189 static void rockchip_drm_unbind(struct device *dev)
191 struct drm_device *drm_dev = dev_get_drvdata(dev);
193 drm_dev_unregister(drm_dev);
195 rockchip_drm_fbdev_fini(drm_dev);
196 drm_kms_helper_poll_fini(drm_dev);
198 drm_atomic_helper_shutdown(drm_dev);
199 component_unbind_all(dev, drm_dev);
200 rockchip_iommu_cleanup(drm_dev);
202 drm_dev_put(drm_dev);
205 static const struct file_operations rockchip_drm_driver_fops = {
206 .owner = THIS_MODULE,
208 .mmap = rockchip_gem_mmap,
211 .unlocked_ioctl = drm_ioctl,
212 .compat_ioctl = drm_compat_ioctl,
213 .release = drm_release,
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,
228 .major = DRIVER_MAJOR,
229 .minor = DRIVER_MINOR,
232 #ifdef CONFIG_PM_SLEEP
233 static int rockchip_drm_sys_suspend(struct device *dev)
235 struct drm_device *drm = dev_get_drvdata(dev);
237 return drm_mode_config_helper_suspend(drm);
240 static int rockchip_drm_sys_resume(struct device *dev)
242 struct drm_device *drm = dev_get_drvdata(dev);
244 return drm_mode_config_helper_resume(drm);
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)
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;
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.
262 * @ep: endpoint of a rockchip vop
264 * returns true if subdriver, false if external bridge and -ENODEV
265 * if remote port does not contain a device.
267 int rockchip_drm_endpoint_is_subdriver(struct device_node *ep)
269 struct device_node *node = of_graph_get_remote_port_parent(ep);
270 struct platform_device *pdev;
271 struct device_driver *drv;
277 /* status disabled will prevent creation of platform-devices */
278 pdev = of_find_device_by_node(node);
284 * All rockchip subdrivers have probed at this point, so
285 * any device not having a driver now is an external bridge.
287 drv = pdev->dev.driver;
289 platform_device_put(pdev);
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);
300 platform_device_put(pdev);
304 static int compare_dev(struct device *dev, void *data)
306 return dev == (struct device *)data;
309 static void rockchip_drm_match_remove(struct device *dev)
311 struct device_link *link;
313 list_for_each_entry(link, &dev->links.consumers, s_node)
314 device_link_del(link);
317 static struct component_match *rockchip_drm_match_add(struct device *dev)
319 struct component_match *match = NULL;
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;
327 d = platform_find_device_by_driver(p, &drv->driver);
334 device_link_add(dev, d, DL_FLAG_STATELESS);
335 component_match_add(dev, &match, compare_dev, d);
340 rockchip_drm_match_remove(dev);
342 return match ?: ERR_PTR(-ENODEV);
345 static const struct component_master_ops rockchip_drm_ops = {
346 .bind = rockchip_drm_bind,
347 .unbind = rockchip_drm_unbind,
350 static int rockchip_drm_platform_of_probe(struct device *dev)
352 struct device_node *np = dev->of_node;
353 struct device_node *port;
361 struct device_node *iommu;
363 port = of_parse_phandle(np, "ports", i);
367 if (!of_device_is_available(port->parent)) {
372 iommu = of_parse_phandle(port->parent, "iommus", 0);
373 if (!iommu || !of_device_is_available(iommu->parent)) {
375 "no iommu attached for %pOF, using non-iommu buffers\n",
378 * if there is a crtc not support iommu, force set all
379 * crtc use non-iommu buffer.
381 is_support_iommu = false;
391 DRM_DEV_ERROR(dev, "missing 'ports' property\n");
397 "No available vop found for display-subsystem.\n");
404 static int rockchip_drm_platform_probe(struct platform_device *pdev)
406 struct device *dev = &pdev->dev;
407 struct component_match *match = NULL;
410 ret = rockchip_drm_platform_of_probe(dev);
414 match = rockchip_drm_match_add(dev);
416 return PTR_ERR(match);
418 ret = component_master_add_with_match(dev, &rockchip_drm_ops, match);
420 rockchip_drm_match_remove(dev);
427 static int rockchip_drm_platform_remove(struct platform_device *pdev)
429 component_master_del(&pdev->dev, &rockchip_drm_ops);
431 rockchip_drm_match_remove(&pdev->dev);
436 static void rockchip_drm_platform_shutdown(struct platform_device *pdev)
438 struct drm_device *drm = platform_get_drvdata(pdev);
441 drm_atomic_helper_shutdown(drm);
444 static const struct of_device_id rockchip_drm_dt_ids[] = {
445 { .compatible = "rockchip,display-subsystem", },
448 MODULE_DEVICE_TABLE(of, rockchip_drm_dt_ids);
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,
455 .name = "rockchip-drm",
456 .of_match_table = rockchip_drm_dt_ids,
457 .pm = &rockchip_drm_pm_ops,
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; \
467 static int __init rockchip_drm_init(void)
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);
486 ret = platform_register_drivers(rockchip_sub_drivers,
487 num_rockchip_sub_drivers);
491 ret = platform_driver_register(&rockchip_drm_platform_driver);
493 goto err_unreg_drivers;
498 platform_unregister_drivers(rockchip_sub_drivers,
499 num_rockchip_sub_drivers);
503 static void __exit rockchip_drm_fini(void)
505 platform_driver_unregister(&rockchip_drm_platform_driver);
507 platform_unregister_drivers(rockchip_sub_drivers,
508 num_rockchip_sub_drivers);
511 module_init(rockchip_drm_init);
512 module_exit(rockchip_drm_fini);
514 MODULE_AUTHOR("Mark Yao <mark.yao@rock-chips.com>");
515 MODULE_DESCRIPTION("ROCKCHIP DRM Driver");
516 MODULE_LICENSE("GPL v2");