1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Parallel video capture module (VIP) for the Tegra VI.
4 *
5 * This file implements the VIP-specific infrastructure.
6 *
7 * Copyright (C) 2023 SKIDATA GmbH
8 * Author: Luca Ceresoli <luca.ceresoli@bootlin.com>
9 */
10
11#include <linux/device.h>
12#include <linux/host1x.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/of_graph.h>
16#include <linux/platform_device.h>
17#include <linux/pm_runtime.h>
18
19#include <media/v4l2-fwnode.h>
20
21#include "vip.h"
22#include "video.h"
23
24static inline struct tegra_vip *host1x_client_to_vip(struct host1x_client *client)
25{
26 return container_of(client, struct tegra_vip, client);
27}
28
29static inline struct tegra_vip_channel *subdev_to_vip_channel(struct v4l2_subdev *subdev)
30{
31 return container_of(subdev, struct tegra_vip_channel, subdev);
32}
33
34static inline struct tegra_vip *vip_channel_to_vip(struct tegra_vip_channel *chan)
35{
36 return container_of(chan, struct tegra_vip, chan);
37}
38
39/* Find the previous subdev in the pipeline (i.e. the one connected to our sink pad) */
40static struct v4l2_subdev *tegra_vip_channel_get_prev_subdev(struct tegra_vip_channel *chan)
41{
42 struct media_pad *remote_pad;
43
44 remote_pad = media_pad_remote_pad_first(pad: &chan->pads[TEGRA_VIP_PAD_SINK]);
45 if (!remote_pad)
46 return NULL;
47
48 return media_entity_to_v4l2_subdev(remote_pad->entity);
49}
50
51static int tegra_vip_enable_stream(struct v4l2_subdev *subdev)
52{
53 struct tegra_vip_channel *vip_chan = subdev_to_vip_channel(subdev);
54 struct tegra_vip *vip = vip_channel_to_vip(chan: vip_chan);
55 struct v4l2_subdev *prev_subdev = tegra_vip_channel_get_prev_subdev(chan: vip_chan);
56 int err;
57
58 err = pm_runtime_resume_and_get(dev: vip->dev);
59 if (err)
60 return dev_err_probe(dev: vip->dev, err, fmt: "failed to get runtime PM\n");
61
62 err = vip->soc->ops->vip_start_streaming(vip_chan);
63 if (err < 0)
64 goto err_start_streaming;
65
66 err = v4l2_subdev_call(prev_subdev, video, s_stream, true);
67 if (err < 0 && err != -ENOIOCTLCMD)
68 goto err_prev_subdev_start_stream;
69
70 return 0;
71
72err_prev_subdev_start_stream:
73err_start_streaming:
74 pm_runtime_put(dev: vip->dev);
75 return err;
76}
77
78static int tegra_vip_disable_stream(struct v4l2_subdev *subdev)
79{
80 struct tegra_vip_channel *vip_chan = subdev_to_vip_channel(subdev);
81 struct tegra_vip *vip = vip_channel_to_vip(chan: vip_chan);
82 struct v4l2_subdev *prev_subdev = tegra_vip_channel_get_prev_subdev(chan: vip_chan);
83
84 v4l2_subdev_call(prev_subdev, video, s_stream, false);
85
86 pm_runtime_put(dev: vip->dev);
87
88 return 0;
89}
90
91static int tegra_vip_s_stream(struct v4l2_subdev *subdev, int enable)
92{
93 int err;
94
95 if (enable)
96 err = tegra_vip_enable_stream(subdev);
97 else
98 err = tegra_vip_disable_stream(subdev);
99
100 return err;
101}
102
103static const struct v4l2_subdev_video_ops tegra_vip_video_ops = {
104 .s_stream = tegra_vip_s_stream,
105};
106
107static const struct v4l2_subdev_ops tegra_vip_ops = {
108 .video = &tegra_vip_video_ops,
109};
110
111static int tegra_vip_channel_of_parse(struct tegra_vip *vip)
112{
113 struct device *dev = vip->dev;
114 struct device_node *np = dev->of_node;
115 struct v4l2_fwnode_endpoint v4l2_ep = {
116 .bus_type = V4L2_MBUS_PARALLEL
117 };
118 struct fwnode_handle *fwh;
119 struct device_node *ep;
120 unsigned int num_pads;
121 int err;
122
123 dev_dbg(dev, "Parsing %pOF", np);
124
125 ep = of_graph_get_endpoint_by_regs(parent: np, port_reg: 0, reg: 0);
126 if (!ep) {
127 err = -EINVAL;
128 dev_err_probe(dev, err, fmt: "%pOF: error getting endpoint node\n", np);
129 goto err_node_put;
130 }
131
132 fwh = of_fwnode_handle(ep);
133 err = v4l2_fwnode_endpoint_parse(fwnode: fwh, vep: &v4l2_ep);
134 of_node_put(node: ep);
135 if (err) {
136 dev_err_probe(dev, err, fmt: "%pOF: failed to parse v4l2 endpoint\n", np);
137 goto err_node_put;
138 }
139
140 num_pads = of_graph_get_endpoint_count(np);
141 if (num_pads != TEGRA_VIP_PADS_NUM) {
142 err = -EINVAL;
143 dev_err_probe(dev, err, fmt: "%pOF: need 2 pads, got %d\n", np, num_pads);
144 goto err_node_put;
145 }
146
147 vip->chan.of_node = of_node_get(node: np);
148 vip->chan.pads[TEGRA_VIP_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
149 vip->chan.pads[TEGRA_VIP_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
150
151 return 0;
152
153err_node_put:
154 of_node_put(node: np);
155 return err;
156}
157
158static int tegra_vip_channel_init(struct tegra_vip *vip)
159{
160 struct v4l2_subdev *subdev;
161 int err;
162
163 subdev = &vip->chan.subdev;
164 v4l2_subdev_init(sd: subdev, ops: &tegra_vip_ops);
165 subdev->dev = vip->dev;
166 snprintf(buf: subdev->name, size: sizeof(subdev->name), fmt: "%s",
167 kbasename(path: vip->chan.of_node->full_name));
168
169 v4l2_set_subdevdata(sd: subdev, p: &vip->chan);
170 subdev->fwnode = of_fwnode_handle(vip->chan.of_node);
171 subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
172
173 err = media_entity_pads_init(entity: &subdev->entity, num_pads: TEGRA_VIP_PADS_NUM, pads: vip->chan.pads);
174 if (err)
175 return dev_err_probe(dev: vip->dev, err, fmt: "failed to initialize media entity\n");
176
177 err = v4l2_async_register_subdev(sd: subdev);
178 if (err) {
179 dev_err_probe(dev: vip->dev, err, fmt: "failed to register subdev\n");
180 goto err_register_subdev;
181 }
182
183 return 0;
184
185err_register_subdev:
186 media_entity_cleanup(entity: &subdev->entity);
187 return err;
188}
189
190static int tegra_vip_init(struct host1x_client *client)
191{
192 struct tegra_vip *vip = host1x_client_to_vip(client);
193 int err;
194
195 err = tegra_vip_channel_of_parse(vip);
196 if (err)
197 return err;
198
199 err = tegra_vip_channel_init(vip);
200 if (err)
201 goto err_init;
202
203 return 0;
204
205err_init:
206 of_node_put(node: vip->chan.of_node);
207 return err;
208}
209
210static int tegra_vip_exit(struct host1x_client *client)
211{
212 struct tegra_vip *vip = host1x_client_to_vip(client);
213 struct v4l2_subdev *subdev = &vip->chan.subdev;
214
215 v4l2_async_unregister_subdev(sd: subdev);
216 media_entity_cleanup(entity: &subdev->entity);
217 of_node_put(node: vip->chan.of_node);
218
219 return 0;
220}
221
222static const struct host1x_client_ops vip_client_ops = {
223 .init = tegra_vip_init,
224 .exit = tegra_vip_exit,
225};
226
227static int tegra_vip_probe(struct platform_device *pdev)
228{
229 struct tegra_vip *vip;
230 int err;
231
232 dev_dbg(&pdev->dev, "Probing VIP \"%s\" from %pOF\n", pdev->name, pdev->dev.of_node);
233
234 vip = devm_kzalloc(dev: &pdev->dev, size: sizeof(*vip), GFP_KERNEL);
235 if (!vip)
236 return -ENOMEM;
237
238 vip->soc = of_device_get_match_data(dev: &pdev->dev);
239
240 vip->dev = &pdev->dev;
241 platform_set_drvdata(pdev, data: vip);
242
243 /* initialize host1x interface */
244 INIT_LIST_HEAD(list: &vip->client.list);
245 vip->client.ops = &vip_client_ops;
246 vip->client.dev = &pdev->dev;
247
248 err = host1x_client_register(&vip->client);
249 if (err)
250 return dev_err_probe(dev: &pdev->dev, err, fmt: "failed to register host1x client\n");
251
252 pm_runtime_enable(dev: &pdev->dev);
253
254 return 0;
255}
256
257static void tegra_vip_remove(struct platform_device *pdev)
258{
259 struct tegra_vip *vip = platform_get_drvdata(pdev);
260
261 host1x_client_unregister(client: &vip->client);
262
263 pm_runtime_disable(dev: &pdev->dev);
264}
265
266#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
267extern const struct tegra_vip_soc tegra20_vip_soc;
268#endif
269
270static const struct of_device_id tegra_vip_of_id_table[] = {
271#if defined(CONFIG_ARCH_TEGRA_2x_SOC)
272 { .compatible = "nvidia,tegra20-vip", .data = &tegra20_vip_soc },
273#endif
274 { }
275};
276MODULE_DEVICE_TABLE(of, tegra_vip_of_id_table);
277
278struct platform_driver tegra_vip_driver = {
279 .driver = {
280 .name = "tegra-vip",
281 .of_match_table = tegra_vip_of_id_table,
282 },
283 .probe = tegra_vip_probe,
284 .remove_new = tegra_vip_remove,
285};
286

source code of linux/drivers/staging/media/tegra-video/vip.c