// 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/dma-mapping.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_module.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; } 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); dev_set_drvdata(dev, drm); 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); dev_set_drvdata(dev, NULL); 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); } /* * 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, component_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); /* * DE2 and DE3 cores actually supports 40-bit addresses, but * driver does not. */ dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); dma_set_max_seg_size(&pdev->dev, UINT_MAX); 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,sun20i-d1-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, }, }; drm_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");