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., <source@cogentembedded.com>
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
26static 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
31static 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
39static 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->csi.channel = 0;
76	cru->ip.remote = cru->csi.subdev;
77
78	/* Create media device link between CRU IP <-> CRU OUTPUT */
79	source = &cru->ip.subdev.entity;
80	sink = &cru->vdev.entity;
81	ret = media_create_pad_link(source, 1, sink, 0,
82				    MEDIA_LNK_FL_ENABLED |
83				    MEDIA_LNK_FL_IMMUTABLE);
84	if (ret) {
85		dev_err(cru->dev, "Error creating link from %s to %s\n",
86			source->name, sink->name);
87		return ret;
88	}
89
90	return 0;
91}
92
93static void rzg2l_cru_group_notify_unbind(struct v4l2_async_notifier *notifier,
94					  struct v4l2_subdev *subdev,
95					  struct v4l2_async_connection *asd)
96{
97	struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
98
99	rzg2l_cru_ip_subdev_unregister(cru);
100
101	mutex_lock(&cru->mdev_lock);
102
103	if (cru->csi.asd == asd) {
104		cru->csi.subdev = NULL;
105		dev_dbg(cru->dev, "Unbind CSI-2 %s\n", subdev->name);
106	}
107
108	mutex_unlock(&cru->mdev_lock);
109}
110
111static int rzg2l_cru_group_notify_bound(struct v4l2_async_notifier *notifier,
112					struct v4l2_subdev *subdev,
113					struct v4l2_async_connection *asd)
114{
115	struct rzg2l_cru_dev *cru = notifier_to_cru(notifier);
116
117	mutex_lock(&cru->mdev_lock);
118
119	if (cru->csi.asd == asd) {
120		cru->csi.subdev = subdev;
121		dev_dbg(cru->dev, "Bound CSI-2 %s\n", subdev->name);
122	}
123
124	mutex_unlock(&cru->mdev_lock);
125
126	return 0;
127}
128
129static const struct v4l2_async_notifier_operations rzg2l_cru_async_ops = {
130	.bound = rzg2l_cru_group_notify_bound,
131	.unbind = rzg2l_cru_group_notify_unbind,
132	.complete = rzg2l_cru_group_notify_complete,
133};
134
135static int rzg2l_cru_mc_parse_of(struct rzg2l_cru_dev *cru)
136{
137	struct v4l2_fwnode_endpoint vep = {
138		.bus_type = V4L2_MBUS_CSI2_DPHY,
139	};
140	struct fwnode_handle *ep, *fwnode;
141	struct v4l2_async_connection *asd;
142	int ret;
143
144	ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(cru->dev), 1, 0, 0);
145	if (!ep)
146		return 0;
147
148	fwnode = fwnode_graph_get_remote_endpoint(ep);
149	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
150	fwnode_handle_put(ep);
151	if (ret) {
152		dev_err(cru->dev, "Failed to parse %pOF\n", to_of_node(fwnode));
153		ret = -EINVAL;
154		goto out;
155	}
156
157	if (!of_device_is_available(to_of_node(fwnode))) {
158		dev_dbg(cru->dev, "OF device %pOF disabled, ignoring\n",
159			to_of_node(fwnode));
160		ret = -ENOTCONN;
161		goto out;
162	}
163
164	asd = v4l2_async_nf_add_fwnode(&cru->notifier, fwnode,
165				       struct v4l2_async_connection);
166	if (IS_ERR(asd)) {
167		ret = PTR_ERR(asd);
168		goto out;
169	}
170
171	cru->csi.asd = asd;
172
173	dev_dbg(cru->dev, "Added OF device %pOF to slot %u\n",
174		to_of_node(fwnode), vep.base.id);
175out:
176	fwnode_handle_put(fwnode);
177
178	return ret;
179}
180
181static int rzg2l_cru_mc_parse_of_graph(struct rzg2l_cru_dev *cru)
182{
183	int ret;
184
185	v4l2_async_nf_init(&cru->notifier, &cru->v4l2_dev);
186
187	ret = rzg2l_cru_mc_parse_of(cru);
188	if (ret)
189		return ret;
190
191	cru->notifier.ops = &rzg2l_cru_async_ops;
192
193	if (list_empty(&cru->notifier.waiting_list))
194		return 0;
195
196	ret = v4l2_async_nf_register(&cru->notifier);
197	if (ret < 0) {
198		dev_err(cru->dev, "Notifier registration failed\n");
199		v4l2_async_nf_cleanup(&cru->notifier);
200		return ret;
201	}
202
203	return 0;
204}
205
206static int rzg2l_cru_media_init(struct rzg2l_cru_dev *cru)
207{
208	struct media_device *mdev = NULL;
209	const struct of_device_id *match;
210	int ret;
211
212	cru->pad.flags = MEDIA_PAD_FL_SINK;
213	ret = media_entity_pads_init(&cru->vdev.entity, 1, &cru->pad);
214	if (ret)
215		return ret;
216
217	mutex_init(&cru->mdev_lock);
218	mdev = &cru->mdev;
219	mdev->dev = cru->dev;
220	mdev->ops = &rzg2l_cru_media_ops;
221
222	match = of_match_node(cru->dev->driver->of_match_table,
223			      cru->dev->of_node);
224
225	strscpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
226	strscpy(mdev->model, match->compatible, sizeof(mdev->model));
227
228	cru->v4l2_dev.mdev = &cru->mdev;
229
230	media_device_init(mdev);
231
232	ret = rzg2l_cru_mc_parse_of_graph(cru);
233	if (ret) {
234		mutex_lock(&cru->mdev_lock);
235		cru->v4l2_dev.mdev = NULL;
236		mutex_unlock(&cru->mdev_lock);
237	}
238
239	return 0;
240}
241
242static int rzg2l_cru_probe(struct platform_device *pdev)
243{
244	struct rzg2l_cru_dev *cru;
245	int ret;
246
247	cru = devm_kzalloc(&pdev->dev, sizeof(*cru), GFP_KERNEL);
248	if (!cru)
249		return -ENOMEM;
250
251	cru->base = devm_platform_ioremap_resource(pdev, 0);
252	if (IS_ERR(cru->base))
253		return PTR_ERR(cru->base);
254
255	cru->presetn = devm_reset_control_get_shared(&pdev->dev, "presetn");
256	if (IS_ERR(cru->presetn))
257		return dev_err_probe(&pdev->dev, PTR_ERR(cru->presetn),
258				     "Failed to get cpg presetn\n");
259
260	cru->aresetn = devm_reset_control_get_exclusive(&pdev->dev, "aresetn");
261	if (IS_ERR(cru->aresetn))
262		return dev_err_probe(&pdev->dev, PTR_ERR(cru->aresetn),
263				     "Failed to get cpg aresetn\n");
264
265	cru->vclk = devm_clk_get(&pdev->dev, "video");
266	if (IS_ERR(cru->vclk))
267		return dev_err_probe(&pdev->dev, PTR_ERR(cru->vclk),
268				     "Failed to get video clock\n");
269
270	cru->dev = &pdev->dev;
271	cru->info = of_device_get_match_data(&pdev->dev);
272
273	cru->image_conv_irq = platform_get_irq(pdev, 0);
274	if (cru->image_conv_irq < 0)
275		return cru->image_conv_irq;
276
277	platform_set_drvdata(pdev, cru);
278
279	ret = rzg2l_cru_dma_register(cru);
280	if (ret)
281		return ret;
282
283	cru->num_buf = RZG2L_CRU_HW_BUFFER_DEFAULT;
284	pm_suspend_ignore_children(&pdev->dev, true);
285	pm_runtime_enable(&pdev->dev);
286
287	ret = rzg2l_cru_media_init(cru);
288	if (ret)
289		goto error_dma_unregister;
290
291	return 0;
292
293error_dma_unregister:
294	rzg2l_cru_dma_unregister(cru);
295	pm_runtime_disable(&pdev->dev);
296
297	return ret;
298}
299
300static void rzg2l_cru_remove(struct platform_device *pdev)
301{
302	struct rzg2l_cru_dev *cru = platform_get_drvdata(pdev);
303
304	pm_runtime_disable(&pdev->dev);
305
306	v4l2_async_nf_unregister(&cru->notifier);
307	v4l2_async_nf_cleanup(&cru->notifier);
308
309	rzg2l_cru_video_unregister(cru);
310	media_device_cleanup(&cru->mdev);
311	mutex_destroy(&cru->mdev_lock);
312
313	rzg2l_cru_dma_unregister(cru);
314}
315
316static const struct of_device_id rzg2l_cru_of_id_table[] = {
317	{ .compatible = "renesas,rzg2l-cru", },
318	{ /* sentinel */ }
319};
320MODULE_DEVICE_TABLE(of, rzg2l_cru_of_id_table);
321
322static struct platform_driver rzg2l_cru_driver = {
323	.driver = {
324		.name = "rzg2l-cru",
325		.of_match_table = rzg2l_cru_of_id_table,
326	},
327	.probe = rzg2l_cru_probe,
328	.remove_new = rzg2l_cru_remove,
329};
330
331module_platform_driver(rzg2l_cru_driver);
332
333MODULE_AUTHOR("Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>");
334MODULE_DESCRIPTION("Renesas RZ/G2L CRU driver");
335MODULE_LICENSE("GPL");
336