1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Driver for Renesas RZ/G2L CRU
4 *
5 * Copyright (C) 2022 Renesas Electronics Corp.
6 *
7 * Based on Renesas R-Car VIN
8 * Copyright (C) 2011-2013 Renesas Solutions Corp.
9 * Copyright (C) 2013 Cogent Embedded, Inc., <[email protected]>
10 * Copyright (C) 2008 Magnus Damm
11 */
12
13 #include <linux/clk.h>
14 #include <linux/module.h>
15 #include <linux/mod_devicetable.h>
16 #include <linux/of.h>
17 #include <linux/of_graph.h>
18 #include <linux/platform_device.h>
19 #include <linux/pm_runtime.h>
20
21 #include <media/v4l2-fwnode.h>
22 #include <media/v4l2-mc.h>
23
24 #include "rzg2l-cru.h"
25
notifier_to_cru(struct v4l2_async_notifier * n)26 static inline struct rzg2l_cru_dev *notifier_to_cru(struct v4l2_async_notifier *n)
27 {
28 return container_of(n, struct rzg2l_cru_dev, notifier);
29 }
30
31 static const struct media_device_ops rzg2l_cru_media_ops = {
32 .link_notify = v4l2_pipeline_link_notify,
33 };
34
35 /* -----------------------------------------------------------------------------
36 * Group async notifier
37 */
38
rzg2l_cru_group_notify_complete(struct v4l2_async_notifier * notifier)39 static int rzg2l_cru_group_notify_complete(struct v4l2_async_notifier *notifier)
40 {
41 struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
42 struct media_entity *source, *sink;
43 int ret;
44
45 ret = rzg2l_cru_ip_subdev_register(cru);
46 if (ret)
47 return ret;
48
49 ret = v4l2_device_register_subdev_nodes(&cru->v4l2_dev);
50 if (ret) {
51 dev_err(cru->dev, "Failed to register subdev nodes\n");
52 return ret;
53 }
54
55 ret = rzg2l_cru_video_register(cru);
56 if (ret)
57 return ret;
58
59 /*
60 * CRU can be connected either to CSI2 or PARALLEL device
61 * For now we are only supporting CSI2
62 *
63 * Create media device link between CSI-2 <-> CRU IP
64 */
65 source = &cru->csi.subdev->entity;
66 sink = &cru->ip.subdev.entity;
67 ret = media_create_pad_link(source, 1, sink, 0,
68 MEDIA_LNK_FL_ENABLED |
69 MEDIA_LNK_FL_IMMUTABLE);
70 if (ret) {
71 dev_err(cru->dev, "Error creating link from %s to %s\n",
72 source->name, sink->name);
73 return ret;
74 }
75 cru->ip.remote = cru->csi.subdev;
76
77 /* Create media device link between CRU IP <-> CRU OUTPUT */
78 source = &cru->ip.subdev.entity;
79 sink = &cru->vdev.entity;
80 ret = media_create_pad_link(source, 1, sink, 0,
81 MEDIA_LNK_FL_ENABLED |
82 MEDIA_LNK_FL_IMMUTABLE);
83 if (ret) {
84 dev_err(cru->dev, "Error creating link from %s to %s\n",
85 source->name, sink->name);
86 return ret;
87 }
88
89 return 0;
90 }
91
rzg2l_cru_group_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)92 static void rzg2l_cru_group_notify_unbind(struct v4l2_async_notifier *notifier,
93 struct v4l2_subdev *subdev,
94 struct v4l2_async_connection *asd)
95 {
96 struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
97
98 rzg2l_cru_ip_subdev_unregister(cru);
99
100 mutex_lock(&cru->mdev_lock);
101
102 if (cru->csi.asd == asd) {
103 cru->csi.subdev = NULL;
104 dev_dbg(cru->dev, "Unbind CSI-2 %s\n", subdev->name);
105 }
106
107 mutex_unlock(&cru->mdev_lock);
108 }
109
rzg2l_cru_group_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)110 static int rzg2l_cru_group_notify_bound(struct v4l2_async_notifier *notifier,
111 struct v4l2_subdev *subdev,
112 struct v4l2_async_connection *asd)
113 {
114 struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
115
116 mutex_lock(&cru->mdev_lock);
117
118 if (cru->csi.asd == asd) {
119 cru->csi.subdev = subdev;
120 dev_dbg(cru->dev, "Bound CSI-2 %s\n", subdev->name);
121 }
122
123 mutex_unlock(&cru->mdev_lock);
124
125 return 0;
126 }
127
128 static const struct v4l2_async_notifier_operations rzg2l_cru_async_ops = {
129 .bound = rzg2l_cru_group_notify_bound,
130 .unbind = rzg2l_cru_group_notify_unbind,
131 .complete = rzg2l_cru_group_notify_complete,
132 };
133
rzg2l_cru_mc_parse_of(struct rzg2l_cru_dev * cru)134 static int rzg2l_cru_mc_parse_of(struct rzg2l_cru_dev *cru)
135 {
136 struct v4l2_fwnode_endpoint vep = {
137 .bus_type = V4L2_MBUS_CSI2_DPHY,
138 };
139 struct fwnode_handle *ep, *fwnode;
140 struct v4l2_async_connection *asd;
141 int ret;
142
143 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(cru->dev), 1, 0, 0);
144 if (!ep)
145 return 0;
146
147 fwnode = fwnode_graph_get_remote_endpoint(ep);
148 ret = v4l2_fwnode_endpoint_parse(ep, &vep);
149 fwnode_handle_put(ep);
150 if (ret) {
151 dev_err(cru->dev, "Failed to parse %pOF\n", to_of_node(fwnode));
152 ret = -EINVAL;
153 goto out;
154 }
155
156 if (!of_device_is_available(to_of_node(fwnode))) {
157 dev_dbg(cru->dev, "OF device %pOF disabled, ignoring\n",
158 to_of_node(fwnode));
159 ret = -ENOTCONN;
160 goto out;
161 }
162
163 asd = v4l2_async_nf_add_fwnode(&cru->notifier, fwnode,
164 struct v4l2_async_connection);
165 if (IS_ERR(asd)) {
166 ret = PTR_ERR(asd);
167 goto out;
168 }
169
170 cru->csi.asd = asd;
171
172 dev_dbg(cru->dev, "Added OF device %pOF to slot %u\n",
173 to_of_node(fwnode), vep.base.id);
174 out:
175 fwnode_handle_put(fwnode);
176
177 return ret;
178 }
179
rzg2l_cru_mc_parse_of_graph(struct rzg2l_cru_dev * cru)180 static int rzg2l_cru_mc_parse_of_graph(struct rzg2l_cru_dev *cru)
181 {
182 int ret;
183
184 v4l2_async_nf_init(&cru->notifier, &cru->v4l2_dev);
185
186 ret = rzg2l_cru_mc_parse_of(cru);
187 if (ret)
188 return ret;
189
190 cru->notifier.ops = &rzg2l_cru_async_ops;
191
192 if (list_empty(&cru->notifier.waiting_list))
193 return 0;
194
195 ret = v4l2_async_nf_register(&cru->notifier);
196 if (ret < 0) {
197 dev_err(cru->dev, "Notifier registration failed\n");
198 v4l2_async_nf_cleanup(&cru->notifier);
199 return ret;
200 }
201
202 return 0;
203 }
204
rzg2l_cru_media_init(struct rzg2l_cru_dev * cru)205 static int rzg2l_cru_media_init(struct rzg2l_cru_dev *cru)
206 {
207 struct media_device *mdev = NULL;
208 const struct of_device_id *match;
209 int ret;
210
211 cru->pad.flags = MEDIA_PAD_FL_SINK | MEDIA_PAD_FL_MUST_CONNECT;
212 ret = media_entity_pads_init(&cru->vdev.entity, 1, &cru->pad);
213 if (ret)
214 return ret;
215
216 mutex_init(&cru->mdev_lock);
217 mdev = &cru->mdev;
218 mdev->dev = cru->dev;
219 mdev->ops = &rzg2l_cru_media_ops;
220
221 match = of_match_node(cru->dev->driver->of_match_table,
222 cru->dev->of_node);
223
224 strscpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
225 strscpy(mdev->model, match->compatible, sizeof(mdev->model));
226
227 cru->v4l2_dev.mdev = &cru->mdev;
228
229 media_device_init(mdev);
230
231 ret = rzg2l_cru_mc_parse_of_graph(cru);
232 if (ret) {
233 mutex_lock(&cru->mdev_lock);
234 cru->v4l2_dev.mdev = NULL;
235 mutex_unlock(&cru->mdev_lock);
236 }
237
238 return 0;
239 }
240
rzg2l_cru_probe(struct platform_device * pdev)241 static int rzg2l_cru_probe(struct platform_device *pdev)
242 {
243 struct rzg2l_cru_dev *cru;
244 int irq, ret;
245
246 cru = devm_kzalloc(&pdev->dev, sizeof(*cru), GFP_KERNEL);
247 if (!cru)
248 return -ENOMEM;
249
250 cru->base = devm_platform_ioremap_resource(pdev, 0);
251 if (IS_ERR(cru->base))
252 return PTR_ERR(cru->base);
253
254 cru->presetn = devm_reset_control_get_shared(&pdev->dev, "presetn");
255 if (IS_ERR(cru->presetn))
256 return dev_err_probe(&pdev->dev, PTR_ERR(cru->presetn),
257 "Failed to get cpg presetn\n");
258
259 cru->aresetn = devm_reset_control_get_exclusive(&pdev->dev, "aresetn");
260 if (IS_ERR(cru->aresetn))
261 return dev_err_probe(&pdev->dev, PTR_ERR(cru->aresetn),
262 "Failed to get cpg aresetn\n");
263
264 cru->vclk = devm_clk_get(&pdev->dev, "video");
265 if (IS_ERR(cru->vclk))
266 return dev_err_probe(&pdev->dev, PTR_ERR(cru->vclk),
267 "Failed to get video clock\n");
268
269 cru->dev = &pdev->dev;
270 cru->info = of_device_get_match_data(&pdev->dev);
271
272 irq = platform_get_irq(pdev, 0);
273 if (irq < 0)
274 return irq;
275
276 ret = devm_request_irq(&pdev->dev, irq, rzg2l_cru_irq, 0,
277 KBUILD_MODNAME, cru);
278 if (ret)
279 return dev_err_probe(&pdev->dev, ret, "failed to request irq\n");
280
281 platform_set_drvdata(pdev, cru);
282
283 ret = rzg2l_cru_dma_register(cru);
284 if (ret)
285 return ret;
286
287 cru->num_buf = RZG2L_CRU_HW_BUFFER_DEFAULT;
288 pm_suspend_ignore_children(&pdev->dev, true);
289 pm_runtime_enable(&pdev->dev);
290
291 ret = rzg2l_cru_media_init(cru);
292 if (ret)
293 goto error_dma_unregister;
294
295 return 0;
296
297 error_dma_unregister:
298 rzg2l_cru_dma_unregister(cru);
299 pm_runtime_disable(&pdev->dev);
300
301 return ret;
302 }
303
rzg2l_cru_remove(struct platform_device * pdev)304 static void rzg2l_cru_remove(struct platform_device *pdev)
305 {
306 struct rzg2l_cru_dev *cru = platform_get_drvdata(pdev);
307
308 pm_runtime_disable(&pdev->dev);
309
310 v4l2_async_nf_unregister(&cru->notifier);
311 v4l2_async_nf_cleanup(&cru->notifier);
312
313 rzg2l_cru_video_unregister(cru);
314 media_device_cleanup(&cru->mdev);
315 mutex_destroy(&cru->mdev_lock);
316
317 rzg2l_cru_dma_unregister(cru);
318 }
319
320 static const struct of_device_id rzg2l_cru_of_id_table[] = {
321 { .compatible = "renesas,rzg2l-cru", },
322 { /* sentinel */ }
323 };
324 MODULE_DEVICE_TABLE(of, rzg2l_cru_of_id_table);
325
326 static struct platform_driver rzg2l_cru_driver = {
327 .driver = {
328 .name = "rzg2l-cru",
329 .of_match_table = rzg2l_cru_of_id_table,
330 },
331 .probe = rzg2l_cru_probe,
332 .remove = rzg2l_cru_remove,
333 };
334
335 module_platform_driver(rzg2l_cru_driver);
336
337 MODULE_AUTHOR("Lad Prabhakar <[email protected]>");
338 MODULE_DESCRIPTION("Renesas RZ/G2L CRU driver");
339 MODULE_LICENSE("GPL");
340