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