650 lines
15 KiB
C
650 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Xilinx Video IP Composite Device
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*
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* Copyright (C) 2013-2015 Ideas on Board
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* Copyright (C) 2013-2015 Xilinx, Inc.
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*
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* Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
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* Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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*/
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <media/v4l2-async.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-fwnode.h>
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#include "xilinx-dma.h"
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#include "xilinx-vipp.h"
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#define XVIPP_DMA_S2MM 0
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#define XVIPP_DMA_MM2S 1
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/**
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* struct xvip_graph_entity - Entity in the video graph
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* @asd: subdev asynchronous registration information
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* @entity: media entity, from the corresponding V4L2 subdev
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* @subdev: V4L2 subdev
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*/
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struct xvip_graph_entity {
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struct v4l2_async_subdev asd; /* must be first */
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struct media_entity *entity;
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struct v4l2_subdev *subdev;
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};
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static inline struct xvip_graph_entity *
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to_xvip_entity(struct v4l2_async_subdev *asd)
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{
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return container_of(asd, struct xvip_graph_entity, asd);
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}
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/* -----------------------------------------------------------------------------
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* Graph Management
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*/
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static struct xvip_graph_entity *
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xvip_graph_find_entity(struct xvip_composite_device *xdev,
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const struct fwnode_handle *fwnode)
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{
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struct xvip_graph_entity *entity;
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struct v4l2_async_subdev *asd;
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list_for_each_entry(asd, &xdev->notifier.asd_list, asd_list) {
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entity = to_xvip_entity(asd);
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if (entity->asd.match.fwnode == fwnode)
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return entity;
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}
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return NULL;
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}
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static int xvip_graph_build_one(struct xvip_composite_device *xdev,
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struct xvip_graph_entity *entity)
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{
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u32 link_flags = MEDIA_LNK_FL_ENABLED;
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struct media_entity *local = entity->entity;
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struct media_entity *remote;
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struct media_pad *local_pad;
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struct media_pad *remote_pad;
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struct xvip_graph_entity *ent;
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struct v4l2_fwnode_link link;
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struct fwnode_handle *ep = NULL;
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int ret = 0;
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dev_dbg(xdev->dev, "creating links for entity %s\n", local->name);
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while (1) {
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/* Get the next endpoint and parse its link. */
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ep = fwnode_graph_get_next_endpoint(entity->asd.match.fwnode,
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ep);
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if (ep == NULL)
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break;
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dev_dbg(xdev->dev, "processing endpoint %p\n", ep);
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ret = v4l2_fwnode_parse_link(ep, &link);
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if (ret < 0) {
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dev_err(xdev->dev, "failed to parse link for %p\n",
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ep);
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continue;
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}
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/* Skip sink ports, they will be processed from the other end of
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* the link.
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*/
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if (link.local_port >= local->num_pads) {
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dev_err(xdev->dev, "invalid port number %u for %p\n",
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link.local_port, link.local_node);
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v4l2_fwnode_put_link(&link);
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ret = -EINVAL;
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break;
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}
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local_pad = &local->pads[link.local_port];
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if (local_pad->flags & MEDIA_PAD_FL_SINK) {
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dev_dbg(xdev->dev, "skipping sink port %p:%u\n",
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link.local_node, link.local_port);
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v4l2_fwnode_put_link(&link);
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continue;
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}
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/* Skip DMA engines, they will be processed separately. */
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if (link.remote_node == of_fwnode_handle(xdev->dev->of_node)) {
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dev_dbg(xdev->dev, "skipping DMA port %p:%u\n",
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link.local_node, link.local_port);
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v4l2_fwnode_put_link(&link);
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continue;
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}
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/* Find the remote entity. */
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ent = xvip_graph_find_entity(xdev, link.remote_node);
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if (ent == NULL) {
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dev_err(xdev->dev, "no entity found for %p\n",
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link.remote_node);
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v4l2_fwnode_put_link(&link);
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ret = -ENODEV;
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break;
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}
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remote = ent->entity;
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if (link.remote_port >= remote->num_pads) {
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dev_err(xdev->dev, "invalid port number %u on %p\n",
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link.remote_port, link.remote_node);
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v4l2_fwnode_put_link(&link);
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ret = -EINVAL;
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break;
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}
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remote_pad = &remote->pads[link.remote_port];
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v4l2_fwnode_put_link(&link);
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/* Create the media link. */
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dev_dbg(xdev->dev, "creating %s:%u -> %s:%u link\n",
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local->name, local_pad->index,
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remote->name, remote_pad->index);
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ret = media_create_pad_link(local, local_pad->index,
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remote, remote_pad->index,
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link_flags);
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if (ret < 0) {
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dev_err(xdev->dev,
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"failed to create %s:%u -> %s:%u link\n",
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local->name, local_pad->index,
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remote->name, remote_pad->index);
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break;
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}
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}
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fwnode_handle_put(ep);
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return ret;
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}
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static struct xvip_dma *
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xvip_graph_find_dma(struct xvip_composite_device *xdev, unsigned int port)
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{
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struct xvip_dma *dma;
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list_for_each_entry(dma, &xdev->dmas, list) {
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if (dma->port == port)
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return dma;
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}
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return NULL;
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}
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static int xvip_graph_build_dma(struct xvip_composite_device *xdev)
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{
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u32 link_flags = MEDIA_LNK_FL_ENABLED;
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struct device_node *node = xdev->dev->of_node;
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struct media_entity *source;
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struct media_entity *sink;
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struct media_pad *source_pad;
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struct media_pad *sink_pad;
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struct xvip_graph_entity *ent;
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struct v4l2_fwnode_link link;
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struct device_node *ep = NULL;
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struct xvip_dma *dma;
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int ret = 0;
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dev_dbg(xdev->dev, "creating links for DMA engines\n");
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while (1) {
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/* Get the next endpoint and parse its link. */
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ep = of_graph_get_next_endpoint(node, ep);
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if (ep == NULL)
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break;
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dev_dbg(xdev->dev, "processing endpoint %pOF\n", ep);
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ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
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if (ret < 0) {
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dev_err(xdev->dev, "failed to parse link for %pOF\n",
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ep);
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continue;
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}
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/* Find the DMA engine. */
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dma = xvip_graph_find_dma(xdev, link.local_port);
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if (dma == NULL) {
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dev_err(xdev->dev, "no DMA engine found for port %u\n",
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link.local_port);
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v4l2_fwnode_put_link(&link);
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ret = -EINVAL;
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break;
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}
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dev_dbg(xdev->dev, "creating link for DMA engine %s\n",
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dma->video.name);
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/* Find the remote entity. */
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ent = xvip_graph_find_entity(xdev, link.remote_node);
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if (ent == NULL) {
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dev_err(xdev->dev, "no entity found for %pOF\n",
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to_of_node(link.remote_node));
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v4l2_fwnode_put_link(&link);
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ret = -ENODEV;
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break;
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}
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if (link.remote_port >= ent->entity->num_pads) {
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dev_err(xdev->dev, "invalid port number %u on %pOF\n",
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link.remote_port,
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to_of_node(link.remote_node));
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v4l2_fwnode_put_link(&link);
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ret = -EINVAL;
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break;
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}
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if (dma->pad.flags & MEDIA_PAD_FL_SOURCE) {
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source = &dma->video.entity;
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source_pad = &dma->pad;
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sink = ent->entity;
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sink_pad = &sink->pads[link.remote_port];
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} else {
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source = ent->entity;
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source_pad = &source->pads[link.remote_port];
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sink = &dma->video.entity;
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sink_pad = &dma->pad;
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}
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v4l2_fwnode_put_link(&link);
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/* Create the media link. */
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dev_dbg(xdev->dev, "creating %s:%u -> %s:%u link\n",
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source->name, source_pad->index,
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sink->name, sink_pad->index);
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ret = media_create_pad_link(source, source_pad->index,
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sink, sink_pad->index,
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link_flags);
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if (ret < 0) {
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dev_err(xdev->dev,
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"failed to create %s:%u -> %s:%u link\n",
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source->name, source_pad->index,
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sink->name, sink_pad->index);
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break;
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}
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}
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of_node_put(ep);
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return ret;
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}
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static int xvip_graph_notify_complete(struct v4l2_async_notifier *notifier)
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{
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struct xvip_composite_device *xdev =
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container_of(notifier, struct xvip_composite_device, notifier);
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struct xvip_graph_entity *entity;
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struct v4l2_async_subdev *asd;
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int ret;
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dev_dbg(xdev->dev, "notify complete, all subdevs registered\n");
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/* Create links for every entity. */
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list_for_each_entry(asd, &xdev->notifier.asd_list, asd_list) {
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entity = to_xvip_entity(asd);
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ret = xvip_graph_build_one(xdev, entity);
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if (ret < 0)
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return ret;
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}
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/* Create links for DMA channels. */
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ret = xvip_graph_build_dma(xdev);
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if (ret < 0)
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return ret;
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ret = v4l2_device_register_subdev_nodes(&xdev->v4l2_dev);
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if (ret < 0)
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dev_err(xdev->dev, "failed to register subdev nodes\n");
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return media_device_register(&xdev->media_dev);
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}
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static int xvip_graph_notify_bound(struct v4l2_async_notifier *notifier,
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struct v4l2_subdev *subdev,
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struct v4l2_async_subdev *unused)
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{
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struct xvip_composite_device *xdev =
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container_of(notifier, struct xvip_composite_device, notifier);
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struct xvip_graph_entity *entity;
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struct v4l2_async_subdev *asd;
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/* Locate the entity corresponding to the bound subdev and store the
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* subdev pointer.
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*/
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list_for_each_entry(asd, &xdev->notifier.asd_list, asd_list) {
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entity = to_xvip_entity(asd);
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if (entity->asd.match.fwnode != subdev->fwnode)
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continue;
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if (entity->subdev) {
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dev_err(xdev->dev, "duplicate subdev for node %p\n",
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entity->asd.match.fwnode);
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return -EINVAL;
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}
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dev_dbg(xdev->dev, "subdev %s bound\n", subdev->name);
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entity->entity = &subdev->entity;
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entity->subdev = subdev;
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return 0;
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}
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dev_err(xdev->dev, "no entity for subdev %s\n", subdev->name);
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return -EINVAL;
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}
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static const struct v4l2_async_notifier_operations xvip_graph_notify_ops = {
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.bound = xvip_graph_notify_bound,
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.complete = xvip_graph_notify_complete,
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};
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static int xvip_graph_parse_one(struct xvip_composite_device *xdev,
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struct fwnode_handle *fwnode)
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{
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struct fwnode_handle *remote;
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struct fwnode_handle *ep = NULL;
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int ret = 0;
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dev_dbg(xdev->dev, "parsing node %p\n", fwnode);
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while (1) {
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struct xvip_graph_entity *xge;
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ep = fwnode_graph_get_next_endpoint(fwnode, ep);
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if (ep == NULL)
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break;
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dev_dbg(xdev->dev, "handling endpoint %p\n", ep);
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remote = fwnode_graph_get_remote_port_parent(ep);
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if (remote == NULL) {
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ret = -EINVAL;
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goto err_notifier_cleanup;
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}
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fwnode_handle_put(ep);
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/* Skip entities that we have already processed. */
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if (remote == of_fwnode_handle(xdev->dev->of_node) ||
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xvip_graph_find_entity(xdev, remote)) {
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fwnode_handle_put(remote);
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continue;
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}
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xge = v4l2_async_nf_add_fwnode(&xdev->notifier, remote,
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struct xvip_graph_entity);
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fwnode_handle_put(remote);
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if (IS_ERR(xge)) {
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ret = PTR_ERR(xge);
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goto err_notifier_cleanup;
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}
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}
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return 0;
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err_notifier_cleanup:
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v4l2_async_nf_cleanup(&xdev->notifier);
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fwnode_handle_put(ep);
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return ret;
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}
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static int xvip_graph_parse(struct xvip_composite_device *xdev)
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{
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struct xvip_graph_entity *entity;
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struct v4l2_async_subdev *asd;
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int ret;
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/*
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* Walk the links to parse the full graph. Start by parsing the
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* composite node and then parse entities in turn. The list_for_each
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* loop will handle entities added at the end of the list while walking
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* the links.
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*/
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ret = xvip_graph_parse_one(xdev, of_fwnode_handle(xdev->dev->of_node));
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if (ret < 0)
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return 0;
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list_for_each_entry(asd, &xdev->notifier.asd_list, asd_list) {
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entity = to_xvip_entity(asd);
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ret = xvip_graph_parse_one(xdev, entity->asd.match.fwnode);
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if (ret < 0) {
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v4l2_async_nf_cleanup(&xdev->notifier);
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break;
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}
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}
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return ret;
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}
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static int xvip_graph_dma_init_one(struct xvip_composite_device *xdev,
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struct device_node *node)
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{
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struct xvip_dma *dma;
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enum v4l2_buf_type type;
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const char *direction;
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unsigned int index;
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int ret;
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ret = of_property_read_string(node, "direction", &direction);
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if (ret < 0)
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return ret;
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if (strcmp(direction, "input") == 0)
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type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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else if (strcmp(direction, "output") == 0)
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type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
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else
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return -EINVAL;
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of_property_read_u32(node, "reg", &index);
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dma = devm_kzalloc(xdev->dev, sizeof(*dma), GFP_KERNEL);
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if (dma == NULL)
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return -ENOMEM;
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ret = xvip_dma_init(xdev, dma, type, index);
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if (ret < 0) {
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dev_err(xdev->dev, "%pOF initialization failed\n", node);
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return ret;
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}
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list_add_tail(&dma->list, &xdev->dmas);
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xdev->v4l2_caps |= type == V4L2_BUF_TYPE_VIDEO_CAPTURE
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? V4L2_CAP_VIDEO_CAPTURE : V4L2_CAP_VIDEO_OUTPUT;
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return 0;
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}
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static int xvip_graph_dma_init(struct xvip_composite_device *xdev)
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{
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struct device_node *ports;
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struct device_node *port;
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int ret = 0;
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ports = of_get_child_by_name(xdev->dev->of_node, "ports");
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if (ports == NULL) {
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dev_err(xdev->dev, "ports node not present\n");
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return -EINVAL;
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}
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for_each_child_of_node(ports, port) {
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ret = xvip_graph_dma_init_one(xdev, port);
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if (ret) {
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of_node_put(port);
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break;
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}
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}
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of_node_put(ports);
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return ret;
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}
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static void xvip_graph_cleanup(struct xvip_composite_device *xdev)
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{
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struct xvip_dma *dmap;
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struct xvip_dma *dma;
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v4l2_async_nf_unregister(&xdev->notifier);
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v4l2_async_nf_cleanup(&xdev->notifier);
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list_for_each_entry_safe(dma, dmap, &xdev->dmas, list) {
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xvip_dma_cleanup(dma);
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list_del(&dma->list);
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}
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}
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static int xvip_graph_init(struct xvip_composite_device *xdev)
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{
|
|
int ret;
|
|
|
|
/* Init the DMA channels. */
|
|
ret = xvip_graph_dma_init(xdev);
|
|
if (ret < 0) {
|
|
dev_err(xdev->dev, "DMA initialization failed\n");
|
|
goto done;
|
|
}
|
|
|
|
/* Parse the graph to extract a list of subdevice DT nodes. */
|
|
ret = xvip_graph_parse(xdev);
|
|
if (ret < 0) {
|
|
dev_err(xdev->dev, "graph parsing failed\n");
|
|
goto done;
|
|
}
|
|
|
|
if (list_empty(&xdev->notifier.asd_list)) {
|
|
dev_err(xdev->dev, "no subdev found in graph\n");
|
|
ret = -ENOENT;
|
|
goto done;
|
|
}
|
|
|
|
/* Register the subdevices notifier. */
|
|
xdev->notifier.ops = &xvip_graph_notify_ops;
|
|
|
|
ret = v4l2_async_nf_register(&xdev->v4l2_dev, &xdev->notifier);
|
|
if (ret < 0) {
|
|
dev_err(xdev->dev, "notifier registration failed\n");
|
|
goto done;
|
|
}
|
|
|
|
ret = 0;
|
|
|
|
done:
|
|
if (ret < 0)
|
|
xvip_graph_cleanup(xdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Media Controller and V4L2
|
|
*/
|
|
|
|
static void xvip_composite_v4l2_cleanup(struct xvip_composite_device *xdev)
|
|
{
|
|
v4l2_device_unregister(&xdev->v4l2_dev);
|
|
media_device_unregister(&xdev->media_dev);
|
|
media_device_cleanup(&xdev->media_dev);
|
|
}
|
|
|
|
static int xvip_composite_v4l2_init(struct xvip_composite_device *xdev)
|
|
{
|
|
int ret;
|
|
|
|
xdev->media_dev.dev = xdev->dev;
|
|
strscpy(xdev->media_dev.model, "Xilinx Video Composite Device",
|
|
sizeof(xdev->media_dev.model));
|
|
xdev->media_dev.hw_revision = 0;
|
|
|
|
media_device_init(&xdev->media_dev);
|
|
|
|
xdev->v4l2_dev.mdev = &xdev->media_dev;
|
|
ret = v4l2_device_register(xdev->dev, &xdev->v4l2_dev);
|
|
if (ret < 0) {
|
|
dev_err(xdev->dev, "V4L2 device registration failed (%d)\n",
|
|
ret);
|
|
media_device_cleanup(&xdev->media_dev);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Platform Device Driver
|
|
*/
|
|
|
|
static int xvip_composite_probe(struct platform_device *pdev)
|
|
{
|
|
struct xvip_composite_device *xdev;
|
|
int ret;
|
|
|
|
xdev = devm_kzalloc(&pdev->dev, sizeof(*xdev), GFP_KERNEL);
|
|
if (!xdev)
|
|
return -ENOMEM;
|
|
|
|
xdev->dev = &pdev->dev;
|
|
INIT_LIST_HEAD(&xdev->dmas);
|
|
v4l2_async_nf_init(&xdev->notifier);
|
|
|
|
ret = xvip_composite_v4l2_init(xdev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = xvip_graph_init(xdev);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
platform_set_drvdata(pdev, xdev);
|
|
|
|
dev_info(xdev->dev, "device registered\n");
|
|
|
|
return 0;
|
|
|
|
error:
|
|
xvip_composite_v4l2_cleanup(xdev);
|
|
return ret;
|
|
}
|
|
|
|
static int xvip_composite_remove(struct platform_device *pdev)
|
|
{
|
|
struct xvip_composite_device *xdev = platform_get_drvdata(pdev);
|
|
|
|
xvip_graph_cleanup(xdev);
|
|
xvip_composite_v4l2_cleanup(xdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id xvip_composite_of_id_table[] = {
|
|
{ .compatible = "xlnx,video" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, xvip_composite_of_id_table);
|
|
|
|
static struct platform_driver xvip_composite_driver = {
|
|
.driver = {
|
|
.name = "xilinx-video",
|
|
.of_match_table = xvip_composite_of_id_table,
|
|
},
|
|
.probe = xvip_composite_probe,
|
|
.remove = xvip_composite_remove,
|
|
};
|
|
|
|
module_platform_driver(xvip_composite_driver);
|
|
|
|
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
|
|
MODULE_DESCRIPTION("Xilinx Video IP Composite Driver");
|
|
MODULE_LICENSE("GPL v2");
|