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// SPDX-License-Identifier: GPL-2.0-only
/*
* Parallel video capture module (VIP) for the Tegra VI.
*
* This file implements the VIP-specific infrastructure.
*
* Copyright (C) 2023 SKIDATA GmbH
* Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
*/
#include <linux/device.h>
#include <linux/host1x.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <media/v4l2-fwnode.h>
#include "vip.h"
#include "video.h"
static inline struct tegra_vip *host1x_client_to_vip(struct host1x_client *client)
{
return container_of(client, struct tegra_vip, client);
}
static inline struct tegra_vip_channel *subdev_to_vip_channel(struct v4l2_subdev *subdev)
{
return container_of(subdev, struct tegra_vip_channel, subdev);
}
static inline struct tegra_vip *vip_channel_to_vip(struct tegra_vip_channel *chan)
{
return container_of(chan, struct tegra_vip, chan);
}
/* Find the previous subdev in the pipeline (i.e. the one connected to our sink pad) */
static struct v4l2_subdev *tegra_vip_channel_get_prev_subdev(struct tegra_vip_channel *chan)
{
struct media_pad *remote_pad;
remote_pad = media_pad_remote_pad_first(&chan->pads[TEGRA_VIP_PAD_SINK]);
if (!remote_pad)
return NULL;
return media_entity_to_v4l2_subdev(remote_pad->entity);
}
static int tegra_vip_enable_stream(struct v4l2_subdev *subdev)
{
struct tegra_vip_channel *vip_chan = subdev_to_vip_channel(subdev);
struct tegra_vip *vip = vip_channel_to_vip(vip_chan);
struct v4l2_subdev *prev_subdev = tegra_vip_channel_get_prev_subdev(vip_chan);
int err;
err = pm_runtime_resume_and_get(vip->dev);
if (err)
return dev_err_probe(vip->dev, err, "failed to get runtime PM\n");
err = vip->soc->ops->vip_start_streaming(vip_chan);
if (err < 0)
goto err_start_streaming;
err = v4l2_subdev_call(prev_subdev, video, s_stream, true);
if (err < 0 && err != -ENOIOCTLCMD)
goto err_prev_subdev_start_stream;
return 0;
err_prev_subdev_start_stream:
err_start_streaming:
pm_runtime_put(vip->dev);
return err;
}
static int tegra_vip_disable_stream(struct v4l2_subdev *subdev)
{
struct tegra_vip_channel *vip_chan = subdev_to_vip_channel(subdev);
struct tegra_vip *vip = vip_channel_to_vip(vip_chan);
struct v4l2_subdev *prev_subdev = tegra_vip_channel_get_prev_subdev(vip_chan);
v4l2_subdev_call(prev_subdev, video, s_stream, false);
pm_runtime_put(vip->dev);
return 0;
}
static int tegra_vip_s_stream(struct v4l2_subdev *subdev, int enable)
{
int err;
if (enable)
err = tegra_vip_enable_stream(subdev);
else
err = tegra_vip_disable_stream(subdev);
return err;
}
static const struct v4l2_subdev_video_ops tegra_vip_video_ops = {
.s_stream = tegra_vip_s_stream,
};
static const struct v4l2_subdev_ops tegra_vip_ops = {
.video = &tegra_vip_video_ops,
};
static int tegra_vip_channel_of_parse(struct tegra_vip *vip)
{
struct device *dev = vip->dev;
struct device_node *np = dev->of_node;
struct v4l2_fwnode_endpoint v4l2_ep = {
.bus_type = V4L2_MBUS_PARALLEL
};
struct fwnode_handle *fwh;
struct device_node *ep;
unsigned int num_pads;
int err;
dev_dbg(dev, "Parsing %pOF", np);
ep = of_graph_get_endpoint_by_regs(np, 0, 0);
if (!ep) {
err = -EINVAL;
dev_err_probe(dev, err, "%pOF: error getting endpoint node\n", np);
goto err_node_put;
}
fwh = of_fwnode_handle(ep);
err = v4l2_fwnode_endpoint_parse(fwh, &v4l2_ep);
of_node_put(ep);
if (err) {
dev_err_probe(dev, err, "%pOF: failed to parse v4l2 endpoint\n", np);
goto err_node_put;
}
num_pads = of_graph_get_endpoint_count(np);
if (num_pads != TEGRA_VIP_PADS_NUM) {
err = -EINVAL;
dev_err_probe(dev, err, "%pOF: need 2 pads, got %d\n", np, num_pads);
goto err_node_put;
}
vip->chan.of_node = of_node_get(np);
vip->chan.pads[TEGRA_VIP_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
vip->chan.pads[TEGRA_VIP_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
return 0;
err_node_put:
of_node_put(np);
return err;
}
static int tegra_vip_channel_init(struct tegra_vip *vip)
{
struct v4l2_subdev *subdev;
int err;
subdev = &vip->chan.subdev;
v4l2_subdev_init(subdev, &tegra_vip_ops);
subdev->dev = vip->dev;
snprintf(subdev->name, V4L2_SUBDEV_NAME_SIZE, "%s",
kbasename(vip->chan.of_node->full_name));
v4l2_set_subdevdata(subdev, &vip->chan);
subdev->fwnode = of_fwnode_handle(vip->chan.of_node);
subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
err = media_entity_pads_init(&subdev->entity, TEGRA_VIP_PADS_NUM, vip->chan.pads);
if (err)
return dev_err_probe(vip->dev, err, "failed to initialize media entity\n");
err = v4l2_async_register_subdev(subdev);
if (err) {
dev_err_probe(vip->dev, err, "failed to register subdev\n");
goto err_register_subdev;
}
return 0;
err_register_subdev:
media_entity_cleanup(&subdev->entity);
return err;
}
static int tegra_vip_init(struct host1x_client *client)
{
struct tegra_vip *vip = host1x_client_to_vip(client);
int err;
err = tegra_vip_channel_of_parse(vip);
if (err)
return err;
err = tegra_vip_channel_init(vip);
if (err)
goto err_init;
return 0;
err_init:
of_node_put(vip->chan.of_node);
return err;
}
static int tegra_vip_exit(struct host1x_client *client)
{
struct tegra_vip *vip = host1x_client_to_vip(client);
struct v4l2_subdev *subdev = &vip->chan.subdev;
v4l2_async_unregister_subdev(subdev);
media_entity_cleanup(&subdev->entity);
of_node_put(vip->chan.of_node);
return 0;
}
static const struct host1x_client_ops vip_client_ops = {
.init = tegra_vip_init,
.exit = tegra_vip_exit,
};
static int tegra_vip_probe(struct platform_device *pdev)
{
struct tegra_vip *vip;
int err;
dev_dbg(&pdev->dev, "Probing VIP \"%s\" from %pOF\n", pdev->name, pdev->dev.of_node);
vip = devm_kzalloc(&pdev->dev, sizeof(*vip), GFP_KERNEL);
if (!vip)
return -ENOMEM;
vip->soc = of_device_get_match_data(&pdev->dev);
vip->dev = &pdev->dev;
platform_set_drvdata(pdev, vip);
/* initialize host1x interface */
INIT_LIST_HEAD(&vip->client.list);
vip->client.ops = &vip_client_ops;
vip->client.dev = &pdev->dev;
err = host1x_client_register(&vip->client);
if (err)
return dev_err_probe(&pdev->dev, err, "failed to register host1x client\n");
pm_runtime_enable(&pdev->dev);
return 0;
}
static int tegra_vip_remove(struct platform_device *pdev)
{
struct tegra_vip *vip = platform_get_drvdata(pdev);
host1x_client_unregister(&vip->client);
pm_runtime_disable(&pdev->dev);
return 0;
}
#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
extern const struct tegra_vip_soc tegra20_vip_soc;
#endif
static const struct of_device_id tegra_vip_of_id_table[] = {
#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
{ .compatible = "nvidia,tegra20-vip", .data = &tegra20_vip_soc },
#endif
{ }
};
MODULE_DEVICE_TABLE(of, tegra_vip_of_id_table);
struct platform_driver tegra_vip_driver = {
.driver = {
.name = "tegra-vip",
.of_match_table = tegra_vip_of_id_table,
},
.probe = tegra_vip_probe,
.remove = tegra_vip_remove,
};
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