| // 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, sizeof(subdev->name), "%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 void 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); |
| } |
| |
| #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_new = tegra_vip_remove, |
| }; |