1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2016 NextThing Co
* Copyright (C) 2016-2019 Bootlin
*
* Author: Maxime Ripard <maxime.ripard@bootlin.com>
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>
#include <linux/videodev2.h>
#include <media/v4l2-dev.h>
#include <media/v4l2-device.h>
#include <media/v4l2-fwnode.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-mediabus.h>
#include <media/videobuf2-core.h>
#include <media/videobuf2-dma-contig.h>
#include "sun4i_csi.h"
struct sun4i_csi_traits {
unsigned int channels;
unsigned int max_width;
bool has_isp;
};
static int sun4i_csi_video_link_validate(struct media_link *link)
{
dev_warn_once(link->graph_obj.mdev->dev,
"Driver bug: link validation not implemented\n");
return 0;
}
static const struct media_entity_operations sun4i_csi_video_entity_ops = {
.link_validate = sun4i_csi_video_link_validate,
};
static const struct media_entity_operations sun4i_csi_subdev_entity_ops = {
.link_validate = v4l2_subdev_link_validate,
};
static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier,
struct v4l2_subdev *subdev,
struct v4l2_async_connection *asd)
{
struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
notifier);
csi->src_subdev = subdev;
csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
subdev->fwnode,
MEDIA_PAD_FL_SOURCE);
if (csi->src_pad < 0) {
dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
subdev->name);
return csi->src_pad;
}
dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
return 0;
}
static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier)
{
struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
notifier);
struct v4l2_subdev *subdev = &csi->subdev;
struct video_device *vdev = &csi->vdev;
int ret;
ret = v4l2_device_register_subdev(&csi->v4l, subdev);
if (ret < 0)
return ret;
ret = sun4i_csi_v4l2_register(csi);
if (ret < 0)
return ret;
ret = media_device_register(&csi->mdev);
if (ret)
return ret;
/* Create link from subdev to main device */
ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE,
&vdev->entity, 0,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret)
goto err_clean_media;
ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
&subdev->entity, CSI_SUBDEV_SINK,
MEDIA_LNK_FL_ENABLED |
MEDIA_LNK_FL_IMMUTABLE);
if (ret)
goto err_clean_media;
ret = v4l2_device_register_subdev_nodes(&csi->v4l);
if (ret < 0)
goto err_clean_media;
return 0;
err_clean_media:
media_device_unregister(&csi->mdev);
return ret;
}
static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = {
.bound = sun4i_csi_notify_bound,
.complete = sun4i_csi_notify_complete,
};
static int sun4i_csi_notifier_init(struct sun4i_csi *csi)
{
struct v4l2_fwnode_endpoint vep = {
.bus_type = V4L2_MBUS_PARALLEL,
};
struct v4l2_async_connection *asd;
struct fwnode_handle *ep;
int ret;
v4l2_async_nf_init(&csi->notifier, &csi->v4l);
ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi->dev), 0, 0,
FWNODE_GRAPH_ENDPOINT_NEXT);
if (!ep)
return -EINVAL;
ret = v4l2_fwnode_endpoint_parse(ep, &vep);
if (ret)
goto out;
csi->bus = vep.bus.parallel;
asd = v4l2_async_nf_add_fwnode_remote(&csi->notifier, ep,
struct v4l2_async_connection);
if (IS_ERR(asd)) {
ret = PTR_ERR(asd);
goto out;
}
csi->notifier.ops = &sun4i_csi_notify_ops;
out:
fwnode_handle_put(ep);
return ret;
}
static int sun4i_csi_probe(struct platform_device *pdev)
{
struct v4l2_subdev *subdev;
struct video_device *vdev;
struct sun4i_csi *csi;
int ret;
int irq;
csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
if (!csi)
return -ENOMEM;
platform_set_drvdata(pdev, csi);
csi->dev = &pdev->dev;
subdev = &csi->subdev;
vdev = &csi->vdev;
csi->traits = of_device_get_match_data(&pdev->dev);
if (!csi->traits)
return -EINVAL;
csi->mdev.dev = csi->dev;
strscpy(csi->mdev.model, "Allwinner Video Capture Device",
sizeof(csi->mdev.model));
csi->mdev.hw_revision = 0;
media_device_init(&csi->mdev);
csi->v4l.mdev = &csi->mdev;
csi->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(csi->regs))
return PTR_ERR(csi->regs);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
csi->bus_clk = devm_clk_get(&pdev->dev, "bus");
if (IS_ERR(csi->bus_clk)) {
dev_err(&pdev->dev, "Couldn't get our bus clock\n");
return PTR_ERR(csi->bus_clk);
}
if (csi->traits->has_isp) {
csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
if (IS_ERR(csi->isp_clk)) {
dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
return PTR_ERR(csi->isp_clk);
}
}
csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
if (IS_ERR(csi->ram_clk)) {
dev_err(&pdev->dev, "Couldn't get our ram clock\n");
return PTR_ERR(csi->ram_clk);
}
csi->rst = devm_reset_control_get(&pdev->dev, NULL);
if (IS_ERR(csi->rst)) {
dev_err(&pdev->dev, "Couldn't get our reset line\n");
return PTR_ERR(csi->rst);
}
/* Initialize subdev */
v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops);
subdev->internal_ops = &sun4i_csi_subdev_internal_ops;
subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
subdev->entity.ops = &sun4i_csi_subdev_entity_ops;
subdev->owner = THIS_MODULE;
snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0");
v4l2_set_subdevdata(subdev, csi);
csi->subdev_pads[CSI_SUBDEV_SINK].flags =
MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS,
csi->subdev_pads);
if (ret < 0)
return ret;
csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
vdev->entity.ops = &sun4i_csi_video_entity_ops;
ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad);
if (ret < 0)
return ret;
ret = sun4i_csi_dma_register(csi, irq);
if (ret)
goto err_clean_pad;
ret = sun4i_csi_notifier_init(csi);
if (ret)
goto err_unregister_media;
ret = v4l2_async_nf_register(&csi->notifier);
if (ret) {
dev_err(csi->dev, "Couldn't register our notifier.\n");
goto err_unregister_media;
}
pm_runtime_enable(&pdev->dev);
return 0;
err_unregister_media:
media_device_unregister(&csi->mdev);
sun4i_csi_dma_unregister(csi);
err_clean_pad:
media_device_cleanup(&csi->mdev);
return ret;
}
static void sun4i_csi_remove(struct platform_device *pdev)
{
struct sun4i_csi *csi = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
v4l2_async_nf_unregister(&csi->notifier);
v4l2_async_nf_cleanup(&csi->notifier);
vb2_video_unregister_device(&csi->vdev);
media_device_unregister(&csi->mdev);
sun4i_csi_dma_unregister(csi);
media_device_cleanup(&csi->mdev);
}
static const struct sun4i_csi_traits sun4i_a10_csi1_traits = {
.channels = 1,
.max_width = 24,
.has_isp = false,
};
static const struct sun4i_csi_traits sun7i_a20_csi0_traits = {
.channels = 4,
.max_width = 16,
.has_isp = true,
};
static const struct of_device_id sun4i_csi_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits },
{ .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun4i_csi_of_match);
static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev)
{
struct sun4i_csi *csi = dev_get_drvdata(dev);
reset_control_deassert(csi->rst);
clk_prepare_enable(csi->bus_clk);
clk_prepare_enable(csi->ram_clk);
clk_set_rate(csi->isp_clk, 80000000);
clk_prepare_enable(csi->isp_clk);
writel(1, csi->regs + CSI_EN_REG);
return 0;
}
static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev)
{
struct sun4i_csi *csi = dev_get_drvdata(dev);
clk_disable_unprepare(csi->isp_clk);
clk_disable_unprepare(csi->ram_clk);
clk_disable_unprepare(csi->bus_clk);
reset_control_assert(csi->rst);
return 0;
}
static const struct dev_pm_ops sun4i_csi_pm_ops = {
SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend,
sun4i_csi_runtime_resume,
NULL)
};
static struct platform_driver sun4i_csi_driver = {
.probe = sun4i_csi_probe,
.remove_new = sun4i_csi_remove,
.driver = {
.name = "sun4i-csi",
.of_match_table = sun4i_csi_of_match,
.pm = &sun4i_csi_pm_ops,
},
};
module_platform_driver(sun4i_csi_driver);
MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver");
MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
MODULE_LICENSE("GPL");
|