--- /dev/null
+/*
+ * Xilinx Video IP Composite Device
+ *
+ * Copyright (C) 2013-2015 Ideas on Board
+ * Copyright (C) 2013-2015 Xilinx, Inc.
+ *
+ * Contacts: Hyun Kwon <hyun.kwon@xilinx.com>
+ * Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <media/v4l2-async.h>
+#include <media/v4l2-common.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-of.h>
+
+#include "xilinx-dma.h"
+#include "xilinx-vipp.h"
+
+#define XVIPP_DMA_S2MM 0
+#define XVIPP_DMA_MM2S 1
+
+/**
+ * struct xvip_graph_entity - Entity in the video graph
+ * @list: list entry in a graph entities list
+ * @node: the entity's DT node
+ * @entity: media entity, from the corresponding V4L2 subdev
+ * @asd: subdev asynchronous registration information
+ * @subdev: V4L2 subdev
+ */
+struct xvip_graph_entity {
+ struct list_head list;
+ struct device_node *node;
+ struct media_entity *entity;
+
+ struct v4l2_async_subdev asd;
+ struct v4l2_subdev *subdev;
+};
+
+/* -----------------------------------------------------------------------------
+ * Graph Management
+ */
+
+static struct xvip_graph_entity *
+xvip_graph_find_entity(struct xvip_composite_device *xdev,
+ const struct device_node *node)
+{
+ struct xvip_graph_entity *entity;
+
+ list_for_each_entry(entity, &xdev->entities, list) {
+ if (entity->node == node)
+ return entity;
+ }
+
+ return NULL;
+}
+
+static int xvip_graph_build_one(struct xvip_composite_device *xdev,
+ struct xvip_graph_entity *entity)
+{
+ u32 link_flags = MEDIA_LNK_FL_ENABLED;
+ struct media_entity *local = entity->entity;
+ struct media_entity *remote;
+ struct media_pad *local_pad;
+ struct media_pad *remote_pad;
+ struct xvip_graph_entity *ent;
+ struct v4l2_of_link link;
+ struct device_node *ep = NULL;
+ struct device_node *next;
+ int ret = 0;
+
+ dev_dbg(xdev->dev, "creating links for entity %s\n", local->name);
+
+ while (1) {
+ /* Get the next endpoint and parse its link. */
+ next = of_graph_get_next_endpoint(entity->node, ep);
+ if (next == NULL)
+ break;
+
+ of_node_put(ep);
+ ep = next;
+
+ dev_dbg(xdev->dev, "processing endpoint %s\n", ep->full_name);
+
+ ret = v4l2_of_parse_link(ep, &link);
+ if (ret < 0) {
+ dev_err(xdev->dev, "failed to parse link for %s\n",
+ ep->full_name);
+ continue;
+ }
+
+ /* Skip sink ports, they will be processed from the other end of
+ * the link.
+ */
+ if (link.local_port >= local->num_pads) {
+ dev_err(xdev->dev, "invalid port number %u on %s\n",
+ link.local_port, link.local_node->full_name);
+ v4l2_of_put_link(&link);
+ ret = -EINVAL;
+ break;
+ }
+
+ local_pad = &local->pads[link.local_port];
+
+ if (local_pad->flags & MEDIA_PAD_FL_SINK) {
+ dev_dbg(xdev->dev, "skipping sink port %s:%u\n",
+ link.local_node->full_name, link.local_port);
+ v4l2_of_put_link(&link);
+ continue;
+ }
+
+ /* Skip DMA engines, they will be processed separately. */
+ if (link.remote_node == xdev->dev->of_node) {
+ dev_dbg(xdev->dev, "skipping DMA port %s:%u\n",
+ link.local_node->full_name, link.local_port);
+ v4l2_of_put_link(&link);
+ continue;
+ }
+
+ /* Find the remote entity. */
+ ent = xvip_graph_find_entity(xdev, link.remote_node);
+ if (ent == NULL) {
+ dev_err(xdev->dev, "no entity found for %s\n",
+ link.remote_node->full_name);
+ v4l2_of_put_link(&link);
+ ret = -ENODEV;
+ break;
+ }
+
+ remote = ent->entity;
+
+ if (link.remote_port >= remote->num_pads) {
+ dev_err(xdev->dev, "invalid port number %u on %s\n",
+ link.remote_port, link.remote_node->full_name);
+ v4l2_of_put_link(&link);
+ ret = -EINVAL;
+ break;
+ }
+
+ remote_pad = &remote->pads[link.remote_port];
+
+ v4l2_of_put_link(&link);
+
+ /* Create the media link. */
+ dev_dbg(xdev->dev, "creating %s:%u -> %s:%u link\n",
+ local->name, local_pad->index,
+ remote->name, remote_pad->index);
+
+ ret = media_entity_create_link(local, local_pad->index,
+ remote, remote_pad->index,
+ link_flags);
+ if (ret < 0) {
+ dev_err(xdev->dev,
+ "failed to create %s:%u -> %s:%u link\n",
+ local->name, local_pad->index,
+ remote->name, remote_pad->index);
+ break;
+ }
+ }
+
+ of_node_put(ep);
+ return ret;
+}
+
+static struct xvip_dma *
+xvip_graph_find_dma(struct xvip_composite_device *xdev, unsigned int port)
+{
+ struct xvip_dma *dma;
+
+ list_for_each_entry(dma, &xdev->dmas, list) {
+ if (dma->port == port)
+ return dma;
+ }
+
+ return NULL;
+}
+
+static int xvip_graph_build_dma(struct xvip_composite_device *xdev)
+{
+ u32 link_flags = MEDIA_LNK_FL_ENABLED;
+ struct device_node *node = xdev->dev->of_node;
+ struct media_entity *source;
+ struct media_entity *sink;
+ struct media_pad *source_pad;
+ struct media_pad *sink_pad;
+ struct xvip_graph_entity *ent;
+ struct v4l2_of_link link;
+ struct device_node *ep = NULL;
+ struct device_node *next;
+ struct xvip_dma *dma;
+ int ret = 0;
+
+ dev_dbg(xdev->dev, "creating links for DMA engines\n");
+
+ while (1) {
+ /* Get the next endpoint and parse its link. */
+ next = of_graph_get_next_endpoint(node, ep);
+ if (next == NULL)
+ break;
+
+ of_node_put(ep);
+ ep = next;
+
+ dev_dbg(xdev->dev, "processing endpoint %s\n", ep->full_name);
+
+ ret = v4l2_of_parse_link(ep, &link);
+ if (ret < 0) {
+ dev_err(xdev->dev, "failed to parse link for %s\n",
+ ep->full_name);
+ continue;
+ }
+
+ /* Find the DMA engine. */
+ dma = xvip_graph_find_dma(xdev, link.local_port);
+ if (dma == NULL) {
+ dev_err(xdev->dev, "no DMA engine found for port %u\n",
+ link.local_port);
+ v4l2_of_put_link(&link);
+ ret = -EINVAL;
+ break;
+ }
+
+ dev_dbg(xdev->dev, "creating link for DMA engine %s\n",
+ dma->video.name);
+
+ /* Find the remote entity. */
+ ent = xvip_graph_find_entity(xdev, link.remote_node);
+ if (ent == NULL) {
+ dev_err(xdev->dev, "no entity found for %s\n",
+ link.remote_node->full_name);
+ v4l2_of_put_link(&link);
+ ret = -ENODEV;
+ break;
+ }
+
+ if (link.remote_port >= ent->entity->num_pads) {
+ dev_err(xdev->dev, "invalid port number %u on %s\n",
+ link.remote_port, link.remote_node->full_name);
+ v4l2_of_put_link(&link);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (dma->pad.flags & MEDIA_PAD_FL_SOURCE) {
+ source = &dma->video.entity;
+ source_pad = &dma->pad;
+ sink = ent->entity;
+ sink_pad = &sink->pads[link.remote_port];
+ } else {
+ source = ent->entity;
+ source_pad = &source->pads[link.remote_port];
+ sink = &dma->video.entity;
+ sink_pad = &dma->pad;
+ }
+
+ v4l2_of_put_link(&link);
+
+ /* Create the media link. */
+ dev_dbg(xdev->dev, "creating %s:%u -> %s:%u link\n",
+ source->name, source_pad->index,
+ sink->name, sink_pad->index);
+
+ ret = media_entity_create_link(source, source_pad->index,
+ sink, sink_pad->index,
+ link_flags);
+ if (ret < 0) {
+ dev_err(xdev->dev,
+ "failed to create %s:%u -> %s:%u link\n",
+ source->name, source_pad->index,
+ sink->name, sink_pad->index);
+ break;
+ }
+ }
+
+ of_node_put(ep);
+ return ret;
+}
+
+static int xvip_graph_notify_complete(struct v4l2_async_notifier *notifier)
+{
+ struct xvip_composite_device *xdev =
+ container_of(notifier, struct xvip_composite_device, notifier);
+ struct xvip_graph_entity *entity;
+ int ret;
+
+ dev_dbg(xdev->dev, "notify complete, all subdevs registered\n");
+
+ /* Create links for every entity. */
+ list_for_each_entry(entity, &xdev->entities, list) {
+ ret = xvip_graph_build_one(xdev, entity);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* Create links for DMA channels. */
+ ret = xvip_graph_build_dma(xdev);
+ if (ret < 0)
+ return ret;
+
+ ret = v4l2_device_register_subdev_nodes(&xdev->v4l2_dev);
+ if (ret < 0)
+ dev_err(xdev->dev, "failed to register subdev nodes\n");
+
+ return ret;
+}
+
+static int xvip_graph_notify_bound(struct v4l2_async_notifier *notifier,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct xvip_composite_device *xdev =
+ container_of(notifier, struct xvip_composite_device, notifier);
+ struct xvip_graph_entity *entity;
+
+ /* Locate the entity corresponding to the bound subdev and store the
+ * subdev pointer.
+ */
+ list_for_each_entry(entity, &xdev->entities, list) {
+ if (entity->node != subdev->dev->of_node)
+ continue;
+
+ if (entity->subdev) {
+ dev_err(xdev->dev, "duplicate subdev for node %s\n",
+ entity->node->full_name);
+ return -EINVAL;
+ }
+
+ dev_dbg(xdev->dev, "subdev %s bound\n", subdev->name);
+ entity->entity = &subdev->entity;
+ entity->subdev = subdev;
+ return 0;
+ }
+
+ dev_err(xdev->dev, "no entity for subdev %s\n", subdev->name);
+ return -EINVAL;
+}
+
+static int xvip_graph_parse_one(struct xvip_composite_device *xdev,
+ struct device_node *node)
+{
+ struct xvip_graph_entity *entity;
+ struct device_node *remote;
+ struct device_node *ep = NULL;
+ struct device_node *next;
+ int ret = 0;
+
+ dev_dbg(xdev->dev, "parsing node %s\n", node->full_name);
+
+ while (1) {
+ next = of_graph_get_next_endpoint(node, ep);
+ if (next == NULL)
+ break;
+
+ of_node_put(ep);
+ ep = next;
+
+ dev_dbg(xdev->dev, "handling endpoint %s\n", ep->full_name);
+
+ remote = of_graph_get_remote_port_parent(ep);
+ if (remote == NULL) {
+ ret = -EINVAL;
+ break;
+ }
+
+ /* Skip entities that we have already processed. */
+ if (remote == xdev->dev->of_node ||
+ xvip_graph_find_entity(xdev, remote)) {
+ of_node_put(remote);
+ continue;
+ }
+
+ entity = devm_kzalloc(xdev->dev, sizeof(*entity), GFP_KERNEL);
+ if (entity == NULL) {
+ of_node_put(remote);
+ ret = -ENOMEM;
+ break;
+ }
+
+ entity->node = remote;
+ entity->asd.match_type = V4L2_ASYNC_MATCH_OF;
+ entity->asd.match.of.node = remote;
+ list_add_tail(&entity->list, &xdev->entities);
+ xdev->num_subdevs++;
+ }
+
+ of_node_put(ep);
+ return ret;
+}
+
+static int xvip_graph_parse(struct xvip_composite_device *xdev)
+{
+ struct xvip_graph_entity *entity;
+ int ret;
+
+ /*
+ * Walk the links to parse the full graph. Start by parsing the
+ * composite node and then parse entities in turn. The list_for_each
+ * loop will handle entities added at the end of the list while walking
+ * the links.
+ */
+ ret = xvip_graph_parse_one(xdev, xdev->dev->of_node);
+ if (ret < 0)
+ return 0;
+
+ list_for_each_entry(entity, &xdev->entities, list) {
+ ret = xvip_graph_parse_one(xdev, entity->node);
+ if (ret < 0)
+ break;
+ }
+
+ return ret;
+}
+
+static int xvip_graph_dma_init_one(struct xvip_composite_device *xdev,
+ struct device_node *node)
+{
+ struct xvip_dma *dma;
+ enum v4l2_buf_type type;
+ const char *direction;
+ unsigned int index;
+ int ret;
+
+ ret = of_property_read_string(node, "direction", &direction);
+ if (ret < 0)
+ return ret;
+
+ if (strcmp(direction, "input") == 0)
+ type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ else if (strcmp(direction, "output") == 0)
+ type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ else
+ return -EINVAL;
+
+ of_property_read_u32(node, "reg", &index);
+
+ dma = devm_kzalloc(xdev->dev, sizeof(*dma), GFP_KERNEL);
+ if (dma == NULL)
+ return -ENOMEM;
+
+ ret = xvip_dma_init(xdev, dma, type, index);
+ if (ret < 0) {
+ dev_err(xdev->dev, "%s initialization failed\n",
+ node->full_name);
+ return ret;
+ }
+
+ list_add_tail(&dma->list, &xdev->dmas);
+
+ xdev->v4l2_caps |= type == V4L2_BUF_TYPE_VIDEO_CAPTURE
+ ? V4L2_CAP_VIDEO_CAPTURE : V4L2_CAP_VIDEO_OUTPUT;
+
+ return 0;
+}
+
+static int xvip_graph_dma_init(struct xvip_composite_device *xdev)
+{
+ struct device_node *ports;
+ struct device_node *port;
+ int ret;
+
+ ports = of_get_child_by_name(xdev->dev->of_node, "ports");
+ if (ports == NULL) {
+ dev_err(xdev->dev, "ports node not present\n");
+ return -EINVAL;
+ }
+
+ for_each_child_of_node(ports, port) {
+ ret = xvip_graph_dma_init_one(xdev, port);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static void xvip_graph_cleanup(struct xvip_composite_device *xdev)
+{
+ struct xvip_graph_entity *entityp;
+ struct xvip_graph_entity *entity;
+ struct xvip_dma *dmap;
+ struct xvip_dma *dma;
+
+ v4l2_async_notifier_unregister(&xdev->notifier);
+
+ list_for_each_entry_safe(entity, entityp, &xdev->entities, list) {
+ of_node_put(entity->node);
+ list_del(&entity->list);
+ }
+
+ list_for_each_entry_safe(dma, dmap, &xdev->dmas, list) {
+ xvip_dma_cleanup(dma);
+ list_del(&dma->list);
+ }
+}
+
+static int xvip_graph_init(struct xvip_composite_device *xdev)
+{
+ struct xvip_graph_entity *entity;
+ struct v4l2_async_subdev **subdevs = NULL;
+ unsigned int num_subdevs;
+ unsigned int i;
+ 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 (!xdev->num_subdevs) {
+ dev_err(xdev->dev, "no subdev found in graph\n");
+ goto done;
+ }
+
+ /* Register the subdevices notifier. */
+ num_subdevs = xdev->num_subdevs;
+ subdevs = devm_kzalloc(xdev->dev, sizeof(*subdevs) * num_subdevs,
+ GFP_KERNEL);
+ if (subdevs == NULL) {
+ ret = -ENOMEM;
+ goto done;
+ }
+
+ i = 0;
+ list_for_each_entry(entity, &xdev->entities, list)
+ subdevs[i++] = &entity->asd;
+
+ xdev->notifier.subdevs = subdevs;
+ xdev->notifier.num_subdevs = num_subdevs;
+ xdev->notifier.bound = xvip_graph_notify_bound;
+ xdev->notifier.complete = xvip_graph_notify_complete;
+
+ ret = v4l2_async_notifier_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);
+}
+
+static int xvip_composite_v4l2_init(struct xvip_composite_device *xdev)
+{
+ int ret;
+
+ xdev->media_dev.dev = xdev->dev;
+ strlcpy(xdev->media_dev.model, "Xilinx Video Composite Device",
+ sizeof(xdev->media_dev.model));
+ xdev->media_dev.hw_revision = 0;
+
+ ret = media_device_register(&xdev->media_dev);
+ if (ret < 0) {
+ dev_err(xdev->dev, "media device registration failed (%d)\n",
+ ret);
+ return ret;
+ }
+
+ 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_unregister(&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->entities);
+ INIT_LIST_HEAD(&xdev->dmas);
+
+ 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");
Code Review / kvmfornfv.git / blobdiff