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- // 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_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 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_VMAP_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;
- drm->irq_enabled = true;
- /* Remove early framebuffers (ie. simplefb) */
- drm_fb_helper_remove_conflicting_framebuffers(NULL, "sun4i-drm-fb", false);
- 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");
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