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9#include <linux/clk.h>
10#include <linux/dma-mapping.h>
11#include <linux/interrupt.h>
12#include <linux/module.h>
13#include <linux/mutex.h>
14#include <linux/of.h>
15#include <linux/of_device.h>
16#include <linux/of_graph.h>
17#include <linux/platform_device.h>
18#include <linux/pm_runtime.h>
19#include <linux/reset.h>
20#include <linux/videodev2.h>
21
22#include <media/v4l2-dev.h>
23#include <media/v4l2-device.h>
24#include <media/v4l2-fwnode.h>
25#include <media/v4l2-ioctl.h>
26#include <media/v4l2-mediabus.h>
27
28#include <media/videobuf2-core.h>
29#include <media/videobuf2-dma-contig.h>
30
31#include "sun4i_csi.h"
32
33struct sun4i_csi_traits {
34 unsigned int channels;
35 unsigned int max_width;
36 bool has_isp;
37};
38
39static const struct media_entity_operations sun4i_csi_video_entity_ops = {
40 .link_validate = v4l2_subdev_link_validate,
41};
42
43static int sun4i_csi_notify_bound(struct v4l2_async_notifier *notifier,
44 struct v4l2_subdev *subdev,
45 struct v4l2_async_subdev *asd)
46{
47 struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
48 notifier);
49
50 csi->src_subdev = subdev;
51 csi->src_pad = media_entity_get_fwnode_pad(&subdev->entity,
52 subdev->fwnode,
53 MEDIA_PAD_FL_SOURCE);
54 if (csi->src_pad < 0) {
55 dev_err(csi->dev, "Couldn't find output pad for subdev %s\n",
56 subdev->name);
57 return csi->src_pad;
58 }
59
60 dev_dbg(csi->dev, "Bound %s pad: %d\n", subdev->name, csi->src_pad);
61 return 0;
62}
63
64static int sun4i_csi_notify_complete(struct v4l2_async_notifier *notifier)
65{
66 struct sun4i_csi *csi = container_of(notifier, struct sun4i_csi,
67 notifier);
68 struct v4l2_subdev *subdev = &csi->subdev;
69 struct video_device *vdev = &csi->vdev;
70 int ret;
71
72 ret = v4l2_device_register_subdev(&csi->v4l, subdev);
73 if (ret < 0)
74 return ret;
75
76 ret = sun4i_csi_v4l2_register(csi);
77 if (ret < 0)
78 return ret;
79
80 ret = media_device_register(&csi->mdev);
81 if (ret)
82 return ret;
83
84
85 ret = media_create_pad_link(&subdev->entity, CSI_SUBDEV_SOURCE,
86 &vdev->entity, 0,
87 MEDIA_LNK_FL_ENABLED |
88 MEDIA_LNK_FL_IMMUTABLE);
89 if (ret)
90 goto err_clean_media;
91
92 ret = media_create_pad_link(&csi->src_subdev->entity, csi->src_pad,
93 &subdev->entity, CSI_SUBDEV_SINK,
94 MEDIA_LNK_FL_ENABLED |
95 MEDIA_LNK_FL_IMMUTABLE);
96 if (ret)
97 goto err_clean_media;
98
99 ret = v4l2_device_register_subdev_nodes(&csi->v4l);
100 if (ret < 0)
101 goto err_clean_media;
102
103 return 0;
104
105err_clean_media:
106 media_device_unregister(&csi->mdev);
107
108 return ret;
109}
110
111static const struct v4l2_async_notifier_operations sun4i_csi_notify_ops = {
112 .bound = sun4i_csi_notify_bound,
113 .complete = sun4i_csi_notify_complete,
114};
115
116static int sun4i_csi_notifier_init(struct sun4i_csi *csi)
117{
118 struct v4l2_fwnode_endpoint vep = {
119 .bus_type = V4L2_MBUS_PARALLEL,
120 };
121 struct v4l2_async_subdev *asd;
122 struct fwnode_handle *ep;
123 int ret;
124
125 v4l2_async_notifier_init(&csi->notifier);
126
127 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(csi->dev), 0, 0,
128 FWNODE_GRAPH_ENDPOINT_NEXT);
129 if (!ep)
130 return -EINVAL;
131
132 ret = v4l2_fwnode_endpoint_parse(ep, &vep);
133 if (ret)
134 goto out;
135
136 csi->bus = vep.bus.parallel;
137
138 asd = v4l2_async_notifier_add_fwnode_remote_subdev(&csi->notifier, ep,
139 struct v4l2_async_subdev);
140 if (IS_ERR(asd)) {
141 ret = PTR_ERR(asd);
142 goto out;
143 }
144
145 csi->notifier.ops = &sun4i_csi_notify_ops;
146
147out:
148 fwnode_handle_put(ep);
149 return ret;
150}
151
152static int sun4i_csi_probe(struct platform_device *pdev)
153{
154 struct v4l2_subdev *subdev;
155 struct video_device *vdev;
156 struct sun4i_csi *csi;
157 struct resource *res;
158 int ret;
159 int irq;
160
161 csi = devm_kzalloc(&pdev->dev, sizeof(*csi), GFP_KERNEL);
162 if (!csi)
163 return -ENOMEM;
164 platform_set_drvdata(pdev, csi);
165 csi->dev = &pdev->dev;
166 subdev = &csi->subdev;
167 vdev = &csi->vdev;
168
169 csi->traits = of_device_get_match_data(&pdev->dev);
170 if (!csi->traits)
171 return -EINVAL;
172
173 csi->mdev.dev = csi->dev;
174 strscpy(csi->mdev.model, "Allwinner Video Capture Device",
175 sizeof(csi->mdev.model));
176 csi->mdev.hw_revision = 0;
177 snprintf(csi->mdev.bus_info, sizeof(csi->mdev.bus_info), "platform:%s",
178 dev_name(csi->dev));
179 media_device_init(&csi->mdev);
180 csi->v4l.mdev = &csi->mdev;
181
182 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
183 csi->regs = devm_ioremap_resource(&pdev->dev, res);
184 if (IS_ERR(csi->regs))
185 return PTR_ERR(csi->regs);
186
187 irq = platform_get_irq(pdev, 0);
188 if (irq < 0)
189 return irq;
190
191 csi->bus_clk = devm_clk_get(&pdev->dev, "bus");
192 if (IS_ERR(csi->bus_clk)) {
193 dev_err(&pdev->dev, "Couldn't get our bus clock\n");
194 return PTR_ERR(csi->bus_clk);
195 }
196
197 if (csi->traits->has_isp) {
198 csi->isp_clk = devm_clk_get(&pdev->dev, "isp");
199 if (IS_ERR(csi->isp_clk)) {
200 dev_err(&pdev->dev, "Couldn't get our ISP clock\n");
201 return PTR_ERR(csi->isp_clk);
202 }
203 }
204
205 csi->ram_clk = devm_clk_get(&pdev->dev, "ram");
206 if (IS_ERR(csi->ram_clk)) {
207 dev_err(&pdev->dev, "Couldn't get our ram clock\n");
208 return PTR_ERR(csi->ram_clk);
209 }
210
211 csi->rst = devm_reset_control_get(&pdev->dev, NULL);
212 if (IS_ERR(csi->rst)) {
213 dev_err(&pdev->dev, "Couldn't get our reset line\n");
214 return PTR_ERR(csi->rst);
215 }
216
217
218 v4l2_subdev_init(subdev, &sun4i_csi_subdev_ops);
219 subdev->flags = V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS;
220 subdev->entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
221 subdev->owner = THIS_MODULE;
222 snprintf(subdev->name, sizeof(subdev->name), "sun4i-csi-0");
223 v4l2_set_subdevdata(subdev, csi);
224
225 csi->subdev_pads[CSI_SUBDEV_SINK].flags =
226 MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
227 csi->subdev_pads[CSI_SUBDEV_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
228 ret = media_entity_pads_init(&subdev->entity, CSI_SUBDEV_PADS,
229 csi->subdev_pads);
230 if (ret < 0)
231 return ret;
232
233 csi->vdev_pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
234 vdev->entity.ops = &sun4i_csi_video_entity_ops;
235 ret = media_entity_pads_init(&vdev->entity, 1, &csi->vdev_pad);
236 if (ret < 0)
237 return ret;
238
239 ret = sun4i_csi_dma_register(csi, irq);
240 if (ret)
241 goto err_clean_pad;
242
243 ret = sun4i_csi_notifier_init(csi);
244 if (ret)
245 goto err_unregister_media;
246
247 ret = v4l2_async_notifier_register(&csi->v4l, &csi->notifier);
248 if (ret) {
249 dev_err(csi->dev, "Couldn't register our notifier.\n");
250 goto err_unregister_media;
251 }
252
253 pm_runtime_enable(&pdev->dev);
254
255 return 0;
256
257err_unregister_media:
258 media_device_unregister(&csi->mdev);
259 sun4i_csi_dma_unregister(csi);
260
261err_clean_pad:
262 media_device_cleanup(&csi->mdev);
263
264 return ret;
265}
266
267static int sun4i_csi_remove(struct platform_device *pdev)
268{
269 struct sun4i_csi *csi = platform_get_drvdata(pdev);
270
271 v4l2_async_notifier_unregister(&csi->notifier);
272 v4l2_async_notifier_cleanup(&csi->notifier);
273 vb2_video_unregister_device(&csi->vdev);
274 media_device_unregister(&csi->mdev);
275 sun4i_csi_dma_unregister(csi);
276 media_device_cleanup(&csi->mdev);
277
278 return 0;
279}
280
281static const struct sun4i_csi_traits sun4i_a10_csi1_traits = {
282 .channels = 1,
283 .max_width = 24,
284 .has_isp = false,
285};
286
287static const struct sun4i_csi_traits sun7i_a20_csi0_traits = {
288 .channels = 4,
289 .max_width = 16,
290 .has_isp = true,
291};
292
293static const struct of_device_id sun4i_csi_of_match[] = {
294 { .compatible = "allwinner,sun4i-a10-csi1", .data = &sun4i_a10_csi1_traits },
295 { .compatible = "allwinner,sun7i-a20-csi0", .data = &sun7i_a20_csi0_traits },
296 { }
297};
298MODULE_DEVICE_TABLE(of, sun4i_csi_of_match);
299
300static int __maybe_unused sun4i_csi_runtime_resume(struct device *dev)
301{
302 struct sun4i_csi *csi = dev_get_drvdata(dev);
303
304 reset_control_deassert(csi->rst);
305 clk_prepare_enable(csi->bus_clk);
306 clk_prepare_enable(csi->ram_clk);
307 clk_set_rate(csi->isp_clk, 80000000);
308 clk_prepare_enable(csi->isp_clk);
309
310 writel(1, csi->regs + CSI_EN_REG);
311
312 return 0;
313}
314
315static int __maybe_unused sun4i_csi_runtime_suspend(struct device *dev)
316{
317 struct sun4i_csi *csi = dev_get_drvdata(dev);
318
319 clk_disable_unprepare(csi->isp_clk);
320 clk_disable_unprepare(csi->ram_clk);
321 clk_disable_unprepare(csi->bus_clk);
322
323 reset_control_assert(csi->rst);
324
325 return 0;
326}
327
328static const struct dev_pm_ops sun4i_csi_pm_ops = {
329 SET_RUNTIME_PM_OPS(sun4i_csi_runtime_suspend,
330 sun4i_csi_runtime_resume,
331 NULL)
332};
333
334static struct platform_driver sun4i_csi_driver = {
335 .probe = sun4i_csi_probe,
336 .remove = sun4i_csi_remove,
337 .driver = {
338 .name = "sun4i-csi",
339 .of_match_table = sun4i_csi_of_match,
340 .pm = &sun4i_csi_pm_ops,
341 },
342};
343module_platform_driver(sun4i_csi_driver);
344
345MODULE_DESCRIPTION("Allwinner A10 Camera Sensor Interface driver");
346MODULE_AUTHOR("Maxime Ripard <mripard@kernel.org>");
347MODULE_LICENSE("GPL");
348
