diff options
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun4i_drv.c')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_drv.c | 453 |
1 files changed, 453 insertions, 0 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c new file mode 100644 index 000000000..5c483bbcc --- /dev/null +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c @@ -0,0 +1,453 @@ +// 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_helper.h> +#include <drm/drm_gem_dma_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_dma_dumb_create_internal(file_priv, drm, args); +} + +DEFINE_DRM_GEM_DMA_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_DMA_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 unbind_all; + + /* Remove early framebuffers (ie. simplefb) */ + ret = drm_aperture_remove_framebuffers(&sun4i_drv_driver); + if (ret) + goto unbind_all; + + 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); +unbind_all: + component_unbind_all(dev, NULL); +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"); |