| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2015 Free Electrons |
| * Copyright (C) 2015 NextThing Co |
| * |
| * Maxime Ripard <maxime.ripard@free-electrons.com> |
| */ |
| |
| #include <linux/component.h> |
| #include <linux/kfifo.h> |
| #include <linux/module.h> |
| #include <linux/of_graph.h> |
| #include <linux/of_reserved_mem.h> |
| #include <linux/platform_device.h> |
| |
| #include <drm/drm_aperture.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_fb_cma_helper.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_gem_cma_helper.h> |
| #include <drm/drm_of.h> |
| #include <drm/drm_probe_helper.h> |
| #include <drm/drm_vblank.h> |
| |
| #include "sun4i_drv.h" |
| #include "sun4i_frontend.h" |
| #include "sun4i_framebuffer.h" |
| #include "sun4i_tcon.h" |
| #include "sun8i_tcon_top.h" |
| |
| static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv, |
| struct drm_device *drm, |
| struct drm_mode_create_dumb *args) |
| { |
| /* The hardware only allows even pitches for YUV buffers. */ |
| args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2); |
| |
| return drm_gem_cma_dumb_create_internal(file_priv, drm, args); |
| } |
| |
| DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops); |
| |
| static const struct drm_driver sun4i_drv_driver = { |
| .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, |
| |
| /* Generic Operations */ |
| .fops = &sun4i_drv_fops, |
| .name = "sun4i-drm", |
| .desc = "Allwinner sun4i Display Engine", |
| .date = "20150629", |
| .major = 1, |
| .minor = 0, |
| |
| /* GEM Operations */ |
| DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create), |
| }; |
| |
| static int sun4i_drv_bind(struct device *dev) |
| { |
| struct drm_device *drm; |
| struct sun4i_drv *drv; |
| int ret; |
| |
| drm = drm_dev_alloc(&sun4i_drv_driver, dev); |
| if (IS_ERR(drm)) |
| return PTR_ERR(drm); |
| |
| drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); |
| if (!drv) { |
| ret = -ENOMEM; |
| goto free_drm; |
| } |
| |
| dev_set_drvdata(dev, drm); |
| drm->dev_private = drv; |
| INIT_LIST_HEAD(&drv->frontend_list); |
| INIT_LIST_HEAD(&drv->engine_list); |
| INIT_LIST_HEAD(&drv->tcon_list); |
| |
| ret = of_reserved_mem_device_init(dev); |
| if (ret && ret != -ENODEV) { |
| dev_err(drm->dev, "Couldn't claim our memory region\n"); |
| goto free_drm; |
| } |
| |
| drm_mode_config_init(drm); |
| |
| ret = component_bind_all(drm->dev, drm); |
| if (ret) { |
| dev_err(drm->dev, "Couldn't bind all pipelines components\n"); |
| goto cleanup_mode_config; |
| } |
| |
| /* drm_vblank_init calls kcalloc, which can fail */ |
| ret = drm_vblank_init(drm, drm->mode_config.num_crtc); |
| if (ret) |
| goto cleanup_mode_config; |
| |
| /* Remove early framebuffers (ie. simplefb) */ |
| ret = drm_aperture_remove_framebuffers(false, &sun4i_drv_driver); |
| if (ret) |
| goto cleanup_mode_config; |
| |
| sun4i_framebuffer_init(drm); |
| |
| /* Enable connectors polling */ |
| drm_kms_helper_poll_init(drm); |
| |
| ret = drm_dev_register(drm, 0); |
| if (ret) |
| goto finish_poll; |
| |
| drm_fbdev_generic_setup(drm, 32); |
| |
| return 0; |
| |
| finish_poll: |
| drm_kms_helper_poll_fini(drm); |
| cleanup_mode_config: |
| drm_mode_config_cleanup(drm); |
| of_reserved_mem_device_release(dev); |
| free_drm: |
| drm_dev_put(drm); |
| return ret; |
| } |
| |
| static void sun4i_drv_unbind(struct device *dev) |
| { |
| struct drm_device *drm = dev_get_drvdata(dev); |
| |
| drm_dev_unregister(drm); |
| drm_kms_helper_poll_fini(drm); |
| drm_atomic_helper_shutdown(drm); |
| drm_mode_config_cleanup(drm); |
| |
| component_unbind_all(dev, NULL); |
| of_reserved_mem_device_release(dev); |
| |
| drm_dev_put(drm); |
| } |
| |
| static const struct component_master_ops sun4i_drv_master_ops = { |
| .bind = sun4i_drv_bind, |
| .unbind = sun4i_drv_unbind, |
| }; |
| |
| static bool sun4i_drv_node_is_connector(struct device_node *node) |
| { |
| return of_device_is_compatible(node, "hdmi-connector"); |
| } |
| |
| static bool sun4i_drv_node_is_frontend(struct device_node *node) |
| { |
| return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") || |
| of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") || |
| of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") || |
| of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") || |
| of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") || |
| of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") || |
| of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend"); |
| } |
| |
| static bool sun4i_drv_node_is_deu(struct device_node *node) |
| { |
| return of_device_is_compatible(node, "allwinner,sun9i-a80-deu"); |
| } |
| |
| static bool sun4i_drv_node_is_supported_frontend(struct device_node *node) |
| { |
| if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND)) |
| return !!of_match_node(sun4i_frontend_of_table, node); |
| |
| return false; |
| } |
| |
| static bool sun4i_drv_node_is_tcon(struct device_node *node) |
| { |
| return !!of_match_node(sun4i_tcon_of_table, node); |
| } |
| |
| static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node) |
| { |
| const struct of_device_id *match; |
| |
| match = of_match_node(sun4i_tcon_of_table, node); |
| if (match) { |
| struct sun4i_tcon_quirks *quirks; |
| |
| quirks = (struct sun4i_tcon_quirks *)match->data; |
| |
| return quirks->has_channel_0; |
| } |
| |
| return false; |
| } |
| |
| static bool sun4i_drv_node_is_tcon_top(struct device_node *node) |
| { |
| return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) && |
| !!of_match_node(sun8i_tcon_top_of_table, node); |
| } |
| |
| static int compare_of(struct device *dev, void *data) |
| { |
| DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n", |
| dev->of_node, |
| data); |
| |
| return dev->of_node == data; |
| } |
| |
| /* |
| * The encoder drivers use drm_of_find_possible_crtcs to get upstream |
| * crtcs from the device tree using of_graph. For the results to be |
| * correct, encoders must be probed/bound after _all_ crtcs have been |
| * created. The existing code uses a depth first recursive traversal |
| * of the of_graph, which means the encoders downstream of the TCON |
| * get add right after the first TCON. The second TCON or CRTC will |
| * never be properly associated with encoders connected to it. |
| * |
| * Also, in a dual display pipeline setup, both frontends can feed |
| * either backend, and both backends can feed either TCON, we want |
| * all components of the same type to be added before the next type |
| * in the pipeline. Fortunately, the pipelines are perfectly symmetric, |
| * i.e. components of the same type are at the same depth when counted |
| * from the frontend. The only exception is the third pipeline in |
| * the A80 SoC, which we do not support anyway. |
| * |
| * Hence we can use a breadth first search traversal order to add |
| * components. We do not need to check for duplicates. The component |
| * matching system handles this for us. |
| */ |
| struct endpoint_list { |
| DECLARE_KFIFO(fifo, struct device_node *, 16); |
| }; |
| |
| static void sun4i_drv_traverse_endpoints(struct endpoint_list *list, |
| struct device_node *node, |
| int port_id) |
| { |
| struct device_node *ep, *remote, *port; |
| |
| port = of_graph_get_port_by_id(node, port_id); |
| if (!port) { |
| DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id); |
| return; |
| } |
| |
| for_each_available_child_of_node(port, ep) { |
| remote = of_graph_get_remote_port_parent(ep); |
| if (!remote) { |
| DRM_DEBUG_DRIVER("Error retrieving the output node\n"); |
| continue; |
| } |
| |
| if (sun4i_drv_node_is_tcon(node)) { |
| /* |
| * TCON TOP is always probed before TCON. However, TCON |
| * points back to TCON TOP when it is source for HDMI. |
| * We have to skip it here to prevent infinite looping |
| * between TCON TOP and TCON. |
| */ |
| if (sun4i_drv_node_is_tcon_top(remote)) { |
| DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n"); |
| of_node_put(remote); |
| continue; |
| } |
| |
| /* |
| * If the node is our TCON with channel 0, the first |
| * port is used for panel or bridges, and will not be |
| * part of the component framework. |
| */ |
| if (sun4i_drv_node_is_tcon_with_ch0(node)) { |
| struct of_endpoint endpoint; |
| |
| if (of_graph_parse_endpoint(ep, &endpoint)) { |
| DRM_DEBUG_DRIVER("Couldn't parse endpoint\n"); |
| of_node_put(remote); |
| continue; |
| } |
| |
| if (!endpoint.id) { |
| DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n"); |
| of_node_put(remote); |
| continue; |
| } |
| } |
| } |
| |
| kfifo_put(&list->fifo, remote); |
| } |
| } |
| |
| static int sun4i_drv_add_endpoints(struct device *dev, |
| struct endpoint_list *list, |
| struct component_match **match, |
| struct device_node *node) |
| { |
| int count = 0; |
| |
| /* |
| * The frontend has been disabled in some of our old device |
| * trees. If we find a node that is the frontend and is |
| * disabled, we should just follow through and parse its |
| * child, but without adding it to the component list. |
| * Otherwise, we obviously want to add it to the list. |
| */ |
| if (!sun4i_drv_node_is_frontend(node) && |
| !of_device_is_available(node)) |
| return 0; |
| |
| /* |
| * The connectors will be the last nodes in our pipeline, we |
| * can just bail out. |
| */ |
| if (sun4i_drv_node_is_connector(node)) |
| return 0; |
| |
| /* |
| * If the device is either just a regular device, or an |
| * enabled frontend supported by the driver, we add it to our |
| * component list. |
| */ |
| if (!(sun4i_drv_node_is_frontend(node) || |
| sun4i_drv_node_is_deu(node)) || |
| (sun4i_drv_node_is_supported_frontend(node) && |
| of_device_is_available(node))) { |
| /* Add current component */ |
| DRM_DEBUG_DRIVER("Adding component %pOF\n", node); |
| drm_of_component_match_add(dev, match, compare_of, node); |
| count++; |
| } |
| |
| /* each node has at least one output */ |
| sun4i_drv_traverse_endpoints(list, node, 1); |
| |
| /* TCON TOP has second and third output */ |
| if (sun4i_drv_node_is_tcon_top(node)) { |
| sun4i_drv_traverse_endpoints(list, node, 3); |
| sun4i_drv_traverse_endpoints(list, node, 5); |
| } |
| |
| return count; |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int sun4i_drv_drm_sys_suspend(struct device *dev) |
| { |
| struct drm_device *drm = dev_get_drvdata(dev); |
| |
| return drm_mode_config_helper_suspend(drm); |
| } |
| |
| static int sun4i_drv_drm_sys_resume(struct device *dev) |
| { |
| struct drm_device *drm = dev_get_drvdata(dev); |
| |
| return drm_mode_config_helper_resume(drm); |
| } |
| #endif |
| |
| static const struct dev_pm_ops sun4i_drv_drm_pm_ops = { |
| SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend, |
| sun4i_drv_drm_sys_resume) |
| }; |
| |
| static int sun4i_drv_probe(struct platform_device *pdev) |
| { |
| struct component_match *match = NULL; |
| struct device_node *np = pdev->dev.of_node, *endpoint; |
| struct endpoint_list list; |
| int i, ret, count = 0; |
| |
| INIT_KFIFO(list.fifo); |
| |
| for (i = 0;; i++) { |
| struct device_node *pipeline = of_parse_phandle(np, |
| "allwinner,pipelines", |
| i); |
| if (!pipeline) |
| break; |
| |
| kfifo_put(&list.fifo, pipeline); |
| } |
| |
| while (kfifo_get(&list.fifo, &endpoint)) { |
| /* process this endpoint */ |
| ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match, |
| endpoint); |
| |
| /* sun4i_drv_add_endpoints can fail to allocate memory */ |
| if (ret < 0) |
| return ret; |
| |
| count += ret; |
| } |
| |
| if (count) |
| return component_master_add_with_match(&pdev->dev, |
| &sun4i_drv_master_ops, |
| match); |
| else |
| return 0; |
| } |
| |
| static int sun4i_drv_remove(struct platform_device *pdev) |
| { |
| component_master_del(&pdev->dev, &sun4i_drv_master_ops); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id sun4i_drv_of_table[] = { |
| { .compatible = "allwinner,sun4i-a10-display-engine" }, |
| { .compatible = "allwinner,sun5i-a10s-display-engine" }, |
| { .compatible = "allwinner,sun5i-a13-display-engine" }, |
| { .compatible = "allwinner,sun6i-a31-display-engine" }, |
| { .compatible = "allwinner,sun6i-a31s-display-engine" }, |
| { .compatible = "allwinner,sun7i-a20-display-engine" }, |
| { .compatible = "allwinner,sun8i-a23-display-engine" }, |
| { .compatible = "allwinner,sun8i-a33-display-engine" }, |
| { .compatible = "allwinner,sun8i-a83t-display-engine" }, |
| { .compatible = "allwinner,sun8i-h3-display-engine" }, |
| { .compatible = "allwinner,sun8i-r40-display-engine" }, |
| { .compatible = "allwinner,sun8i-v3s-display-engine" }, |
| { .compatible = "allwinner,sun9i-a80-display-engine" }, |
| { .compatible = "allwinner,sun50i-a64-display-engine" }, |
| { .compatible = "allwinner,sun50i-h6-display-engine" }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(of, sun4i_drv_of_table); |
| |
| static struct platform_driver sun4i_drv_platform_driver = { |
| .probe = sun4i_drv_probe, |
| .remove = sun4i_drv_remove, |
| .driver = { |
| .name = "sun4i-drm", |
| .of_match_table = sun4i_drv_of_table, |
| .pm = &sun4i_drv_drm_pm_ops, |
| }, |
| }; |
| module_platform_driver(sun4i_drv_platform_driver); |
| |
| MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); |
| MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); |
| MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver"); |
| MODULE_LICENSE("GPL"); |