1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2021 Renesas Electronics Corp.
4 *
5 * Driver for Renesas R-Car ISP Channel Selector
6 *
7 * The ISP hardware is capable of more than just channel selection, features
8 * such as demosaicing, white balance control and color space conversion are
9 * also possible. These more advanced features are not supported by the driver
10 * due to lack of documentation.
11 */
12
13 #include <linux/module.h>
14 #include <linux/mutex.h>
15 #include <linux/of.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 #include <linux/reset.h>
19
20 #include <media/mipi-csi2.h>
21 #include <media/v4l2-subdev.h>
22
23 #define ISPINPUTSEL0_REG 0x0008
24 #define ISPINPUTSEL0_SEL_CSI0 BIT(31)
25
26 #define ISPSTART_REG 0x0014
27 #define ISPSTART_START 0xffff
28 #define ISPSTART_STOP 0x0000
29
30 #define ISPPROCMODE_DT_REG(n) (0x1100 + (0x4 * (n)))
31 #define ISPPROCMODE_DT_PROC_MODE_VC3(pm) (((pm) & 0x3f) << 24)
32 #define ISPPROCMODE_DT_PROC_MODE_VC2(pm) (((pm) & 0x3f) << 16)
33 #define ISPPROCMODE_DT_PROC_MODE_VC1(pm) (((pm) & 0x3f) << 8)
34 #define ISPPROCMODE_DT_PROC_MODE_VC0(pm) ((pm) & 0x3f)
35
36 #define ISPCS_FILTER_ID_CH_REG(n) (0x3000 + (0x0100 * (n)))
37
38 #define ISPCS_DT_CODE03_CH_REG(n) (0x3008 + (0x100 * (n)))
39 #define ISPCS_DT_CODE03_EN3 BIT(31)
40 #define ISPCS_DT_CODE03_DT3(dt) (((dt) & 0x3f) << 24)
41 #define ISPCS_DT_CODE03_EN2 BIT(23)
42 #define ISPCS_DT_CODE03_DT2(dt) (((dt) & 0x3f) << 16)
43 #define ISPCS_DT_CODE03_EN1 BIT(15)
44 #define ISPCS_DT_CODE03_DT1(dt) (((dt) & 0x3f) << 8)
45 #define ISPCS_DT_CODE03_EN0 BIT(7)
46 #define ISPCS_DT_CODE03_DT0(dt) ((dt) & 0x3f)
47
48 struct rcar_isp_format {
49 u32 code;
50 unsigned int datatype;
51 unsigned int procmode;
52 };
53
54 static const struct rcar_isp_format rcar_isp_formats[] = {
55 {
56 .code = MEDIA_BUS_FMT_RGB888_1X24,
57 .datatype = MIPI_CSI2_DT_RGB888,
58 .procmode = 0x15
59 }, {
60 .code = MEDIA_BUS_FMT_Y10_1X10,
61 .datatype = MIPI_CSI2_DT_RAW10,
62 .procmode = 0x10,
63 }, {
64 .code = MEDIA_BUS_FMT_UYVY8_1X16,
65 .datatype = MIPI_CSI2_DT_YUV422_8B,
66 .procmode = 0x0c,
67 }, {
68 .code = MEDIA_BUS_FMT_YUYV8_1X16,
69 .datatype = MIPI_CSI2_DT_YUV422_8B,
70 .procmode = 0x0c,
71 }, {
72 .code = MEDIA_BUS_FMT_UYVY8_2X8,
73 .datatype = MIPI_CSI2_DT_YUV422_8B,
74 .procmode = 0x0c,
75 }, {
76 .code = MEDIA_BUS_FMT_YUYV10_2X10,
77 .datatype = MIPI_CSI2_DT_YUV422_8B,
78 .procmode = 0x0c,
79 }, {
80 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
81 .datatype = MIPI_CSI2_DT_RAW8,
82 .procmode = 0x00,
83 }, {
84 .code = MEDIA_BUS_FMT_SGBRG8_1X8,
85 .datatype = MIPI_CSI2_DT_RAW8,
86 .procmode = 0x00,
87 }, {
88 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
89 .datatype = MIPI_CSI2_DT_RAW8,
90 .procmode = 0x00,
91 }, {
92 .code = MEDIA_BUS_FMT_SRGGB8_1X8,
93 .datatype = MIPI_CSI2_DT_RAW8,
94 .procmode = 0x00,
95 }, {
96 .code = MEDIA_BUS_FMT_SBGGR10_1X10,
97 .datatype = MIPI_CSI2_DT_RAW10,
98 .procmode = 0x01,
99 }, {
100 .code = MEDIA_BUS_FMT_SGBRG10_1X10,
101 .datatype = MIPI_CSI2_DT_RAW10,
102 .procmode = 0x01,
103 }, {
104 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
105 .datatype = MIPI_CSI2_DT_RAW10,
106 .procmode = 0x01,
107 }, {
108 .code = MEDIA_BUS_FMT_SRGGB10_1X10,
109 .datatype = MIPI_CSI2_DT_RAW10,
110 .procmode = 0x01,
111 }, {
112 .code = MEDIA_BUS_FMT_SBGGR12_1X12,
113 .datatype = MIPI_CSI2_DT_RAW12,
114 .procmode = 0x02,
115 }, {
116 .code = MEDIA_BUS_FMT_SGBRG12_1X12,
117 .datatype = MIPI_CSI2_DT_RAW12,
118 .procmode = 0x02,
119 }, {
120 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
121 .datatype = MIPI_CSI2_DT_RAW12,
122 .procmode = 0x02,
123 }, {
124 .code = MEDIA_BUS_FMT_SRGGB12_1X12,
125 .datatype = MIPI_CSI2_DT_RAW12,
126 .procmode = 0x02,
127 },
128 };
129
risp_code_to_fmt(unsigned int code)130 static const struct rcar_isp_format *risp_code_to_fmt(unsigned int code)
131 {
132 unsigned int i;
133
134 for (i = 0; i < ARRAY_SIZE(rcar_isp_formats); i++) {
135 if (rcar_isp_formats[i].code == code)
136 return &rcar_isp_formats[i];
137 }
138
139 return NULL;
140 }
141
142 enum rcar_isp_input {
143 RISP_CSI_INPUT0,
144 RISP_CSI_INPUT1,
145 };
146
147 enum rcar_isp_pads {
148 RCAR_ISP_SINK,
149 RCAR_ISP_PORT0,
150 RCAR_ISP_PORT1,
151 RCAR_ISP_PORT2,
152 RCAR_ISP_PORT3,
153 RCAR_ISP_PORT4,
154 RCAR_ISP_PORT5,
155 RCAR_ISP_PORT6,
156 RCAR_ISP_PORT7,
157 RCAR_ISP_NUM_PADS,
158 };
159
160 struct rcar_isp {
161 struct device *dev;
162 void __iomem *base;
163 struct reset_control *rstc;
164
165 enum rcar_isp_input csi_input;
166
167 struct v4l2_subdev subdev;
168 struct media_pad pads[RCAR_ISP_NUM_PADS];
169
170 struct v4l2_async_notifier notifier;
171 struct v4l2_subdev *remote;
172 unsigned int remote_pad;
173
174 int stream_count;
175 };
176
sd_to_isp(struct v4l2_subdev * sd)177 static inline struct rcar_isp *sd_to_isp(struct v4l2_subdev *sd)
178 {
179 return container_of(sd, struct rcar_isp, subdev);
180 }
181
notifier_to_isp(struct v4l2_async_notifier * n)182 static inline struct rcar_isp *notifier_to_isp(struct v4l2_async_notifier *n)
183 {
184 return container_of(n, struct rcar_isp, notifier);
185 }
186
risp_write(struct rcar_isp * isp,u32 offset,u32 value)187 static void risp_write(struct rcar_isp *isp, u32 offset, u32 value)
188 {
189 iowrite32(value, isp->base + offset);
190 }
191
risp_read(struct rcar_isp * isp,u32 offset)192 static u32 risp_read(struct rcar_isp *isp, u32 offset)
193 {
194 return ioread32(isp->base + offset);
195 }
196
risp_power_on(struct rcar_isp * isp)197 static int risp_power_on(struct rcar_isp *isp)
198 {
199 int ret;
200
201 ret = pm_runtime_resume_and_get(isp->dev);
202 if (ret < 0)
203 return ret;
204
205 ret = reset_control_deassert(isp->rstc);
206 if (ret < 0) {
207 pm_runtime_put(isp->dev);
208 return ret;
209 }
210
211 return 0;
212 }
213
risp_power_off(struct rcar_isp * isp)214 static void risp_power_off(struct rcar_isp *isp)
215 {
216 reset_control_assert(isp->rstc);
217 pm_runtime_put(isp->dev);
218 }
219
risp_start(struct rcar_isp * isp,struct v4l2_subdev_state * state)220 static int risp_start(struct rcar_isp *isp, struct v4l2_subdev_state *state)
221 {
222 const struct v4l2_mbus_framefmt *fmt;
223 const struct rcar_isp_format *format;
224 unsigned int vc;
225 u32 sel_csi = 0;
226 int ret;
227
228 fmt = v4l2_subdev_state_get_format(state, RCAR_ISP_SINK);
229 if (!fmt)
230 return -EINVAL;
231
232 format = risp_code_to_fmt(fmt->code);
233 if (!format) {
234 dev_err(isp->dev, "Unsupported bus format\n");
235 return -EINVAL;
236 }
237
238 ret = risp_power_on(isp);
239 if (ret) {
240 dev_err(isp->dev, "Failed to power on ISP\n");
241 return ret;
242 }
243
244 /* Select CSI-2 input source. */
245 if (isp->csi_input == RISP_CSI_INPUT1)
246 sel_csi = ISPINPUTSEL0_SEL_CSI0;
247
248 risp_write(isp, ISPINPUTSEL0_REG,
249 risp_read(isp, ISPINPUTSEL0_REG) | sel_csi);
250
251 /* Configure Channel Selector. */
252 for (vc = 0; vc < 4; vc++) {
253 u8 ch = vc + 4;
254 u8 dt = format->datatype;
255
256 risp_write(isp, ISPCS_FILTER_ID_CH_REG(ch), BIT(vc));
257 risp_write(isp, ISPCS_DT_CODE03_CH_REG(ch),
258 ISPCS_DT_CODE03_EN3 | ISPCS_DT_CODE03_DT3(dt) |
259 ISPCS_DT_CODE03_EN2 | ISPCS_DT_CODE03_DT2(dt) |
260 ISPCS_DT_CODE03_EN1 | ISPCS_DT_CODE03_DT1(dt) |
261 ISPCS_DT_CODE03_EN0 | ISPCS_DT_CODE03_DT0(dt));
262 }
263
264 /* Setup processing method. */
265 risp_write(isp, ISPPROCMODE_DT_REG(format->datatype),
266 ISPPROCMODE_DT_PROC_MODE_VC3(format->procmode) |
267 ISPPROCMODE_DT_PROC_MODE_VC2(format->procmode) |
268 ISPPROCMODE_DT_PROC_MODE_VC1(format->procmode) |
269 ISPPROCMODE_DT_PROC_MODE_VC0(format->procmode));
270
271 /* Start ISP. */
272 risp_write(isp, ISPSTART_REG, ISPSTART_START);
273
274 ret = v4l2_subdev_enable_streams(isp->remote, isp->remote_pad,
275 BIT_ULL(0));
276 if (ret)
277 risp_power_off(isp);
278
279 return ret;
280 }
281
risp_stop(struct rcar_isp * isp)282 static void risp_stop(struct rcar_isp *isp)
283 {
284 v4l2_subdev_disable_streams(isp->remote, isp->remote_pad, BIT_ULL(0));
285
286 /* Stop ISP. */
287 risp_write(isp, ISPSTART_REG, ISPSTART_STOP);
288
289 risp_power_off(isp);
290 }
291
risp_enable_streams(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,u32 source_pad,u64 source_streams_mask)292 static int risp_enable_streams(struct v4l2_subdev *sd,
293 struct v4l2_subdev_state *state, u32 source_pad,
294 u64 source_streams_mask)
295 {
296 struct rcar_isp *isp = sd_to_isp(sd);
297 int ret = 0;
298
299 if (source_streams_mask != 1)
300 return -EINVAL;
301
302 if (!isp->remote)
303 return -ENODEV;
304
305 if (isp->stream_count == 0) {
306 ret = risp_start(isp, state);
307 if (ret)
308 return ret;
309 }
310
311 isp->stream_count += 1;
312
313 return ret;
314 }
315
risp_disable_streams(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,u32 source_pad,u64 source_streams_mask)316 static int risp_disable_streams(struct v4l2_subdev *sd,
317 struct v4l2_subdev_state *state, u32 source_pad,
318 u64 source_streams_mask)
319 {
320 struct rcar_isp *isp = sd_to_isp(sd);
321
322 if (source_streams_mask != 1)
323 return -EINVAL;
324
325 if (!isp->remote)
326 return -ENODEV;
327
328 if (isp->stream_count == 1)
329 risp_stop(isp);
330
331 isp->stream_count -= 1;
332
333 return 0;
334 }
335
risp_set_pad_format(struct v4l2_subdev * sd,struct v4l2_subdev_state * state,struct v4l2_subdev_format * format)336 static int risp_set_pad_format(struct v4l2_subdev *sd,
337 struct v4l2_subdev_state *state,
338 struct v4l2_subdev_format *format)
339 {
340 struct v4l2_mbus_framefmt *framefmt;
341
342 if (format->pad > RCAR_ISP_SINK)
343 return v4l2_subdev_get_fmt(sd, state, format);
344
345 if (!risp_code_to_fmt(format->format.code))
346 format->format.code = rcar_isp_formats[0].code;
347
348 for (unsigned int i = 0; i < RCAR_ISP_NUM_PADS; i++) {
349 framefmt = v4l2_subdev_state_get_format(state, i);
350 *framefmt = format->format;
351 }
352
353 return 0;
354 }
355
356 static const struct v4l2_subdev_pad_ops risp_pad_ops = {
357 .enable_streams = risp_enable_streams,
358 .disable_streams = risp_disable_streams,
359 .set_fmt = risp_set_pad_format,
360 .get_fmt = v4l2_subdev_get_fmt,
361 .link_validate = v4l2_subdev_link_validate_default,
362 };
363
364 static const struct v4l2_subdev_ops rcar_isp_subdev_ops = {
365 .pad = &risp_pad_ops,
366 };
367
368 /* -----------------------------------------------------------------------------
369 * Async handling and registration of subdevices and links
370 */
371
risp_notify_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)372 static int risp_notify_bound(struct v4l2_async_notifier *notifier,
373 struct v4l2_subdev *subdev,
374 struct v4l2_async_connection *asd)
375 {
376 struct rcar_isp *isp = notifier_to_isp(notifier);
377 int pad;
378
379 pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
380 MEDIA_PAD_FL_SOURCE);
381 if (pad < 0) {
382 dev_err(isp->dev, "Failed to find pad for %s\n", subdev->name);
383 return pad;
384 }
385
386 isp->remote = subdev;
387 isp->remote_pad = pad;
388
389 dev_dbg(isp->dev, "Bound %s pad: %d\n", subdev->name, pad);
390
391 return media_create_pad_link(&subdev->entity, pad,
392 &isp->subdev.entity, 0,
393 MEDIA_LNK_FL_ENABLED |
394 MEDIA_LNK_FL_IMMUTABLE);
395 }
396
risp_notify_unbind(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)397 static void risp_notify_unbind(struct v4l2_async_notifier *notifier,
398 struct v4l2_subdev *subdev,
399 struct v4l2_async_connection *asd)
400 {
401 struct rcar_isp *isp = notifier_to_isp(notifier);
402
403 isp->remote = NULL;
404
405 dev_dbg(isp->dev, "Unbind %s\n", subdev->name);
406 }
407
408 static const struct v4l2_async_notifier_operations risp_notify_ops = {
409 .bound = risp_notify_bound,
410 .unbind = risp_notify_unbind,
411 };
412
risp_parse_dt(struct rcar_isp * isp)413 static int risp_parse_dt(struct rcar_isp *isp)
414 {
415 struct v4l2_async_connection *asd;
416 struct fwnode_handle *fwnode;
417 struct fwnode_handle *ep;
418 unsigned int id;
419 int ret;
420
421 for (id = 0; id < 2; id++) {
422 ep = fwnode_graph_get_endpoint_by_id(dev_fwnode(isp->dev),
423 0, id, 0);
424 if (ep)
425 break;
426 }
427
428 if (!ep) {
429 dev_err(isp->dev, "Not connected to subdevice\n");
430 return -EINVAL;
431 }
432
433 if (id == 1)
434 isp->csi_input = RISP_CSI_INPUT1;
435
436 fwnode = fwnode_graph_get_remote_endpoint(ep);
437 fwnode_handle_put(ep);
438
439 dev_dbg(isp->dev, "Found '%pOF'\n", to_of_node(fwnode));
440
441 v4l2_async_subdev_nf_init(&isp->notifier, &isp->subdev);
442 isp->notifier.ops = &risp_notify_ops;
443
444 asd = v4l2_async_nf_add_fwnode(&isp->notifier, fwnode,
445 struct v4l2_async_connection);
446 fwnode_handle_put(fwnode);
447 if (IS_ERR(asd))
448 return PTR_ERR(asd);
449
450 ret = v4l2_async_nf_register(&isp->notifier);
451 if (ret)
452 v4l2_async_nf_cleanup(&isp->notifier);
453
454 return ret;
455 }
456
457 /* -----------------------------------------------------------------------------
458 * Platform Device Driver
459 */
460
461 static const struct media_entity_operations risp_entity_ops = {
462 .link_validate = v4l2_subdev_link_validate,
463 };
464
risp_probe_resources(struct rcar_isp * isp,struct platform_device * pdev)465 static int risp_probe_resources(struct rcar_isp *isp,
466 struct platform_device *pdev)
467 {
468 isp->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
469 if (IS_ERR(isp->base))
470 return PTR_ERR(isp->base);
471
472 isp->rstc = devm_reset_control_get(&pdev->dev, NULL);
473
474 return PTR_ERR_OR_ZERO(isp->rstc);
475 }
476
477 static const struct of_device_id risp_of_id_table[] = {
478 { .compatible = "renesas,r8a779a0-isp" },
479 { .compatible = "renesas,r8a779g0-isp" },
480 /* Keep above for compatibility with old DTB files. */
481 { .compatible = "renesas,rcar-gen4-isp" },
482 { /* sentinel */ }
483 };
484 MODULE_DEVICE_TABLE(of, risp_of_id_table);
485
risp_probe(struct platform_device * pdev)486 static int risp_probe(struct platform_device *pdev)
487 {
488 struct rcar_isp *isp;
489 unsigned int i;
490 int ret;
491
492 isp = devm_kzalloc(&pdev->dev, sizeof(*isp), GFP_KERNEL);
493 if (!isp)
494 return -ENOMEM;
495
496 isp->dev = &pdev->dev;
497
498 ret = risp_probe_resources(isp, pdev);
499 if (ret) {
500 dev_err(isp->dev, "Failed to get resources\n");
501 return ret;
502 }
503
504 platform_set_drvdata(pdev, isp);
505
506 pm_runtime_enable(&pdev->dev);
507
508 ret = risp_parse_dt(isp);
509 if (ret)
510 goto error_pm;
511
512 isp->subdev.owner = THIS_MODULE;
513 isp->subdev.dev = &pdev->dev;
514 v4l2_subdev_init(&isp->subdev, &rcar_isp_subdev_ops);
515 v4l2_set_subdevdata(&isp->subdev, &pdev->dev);
516 snprintf(isp->subdev.name, sizeof(isp->subdev.name), "%s %s",
517 KBUILD_MODNAME, dev_name(&pdev->dev));
518 isp->subdev.flags = V4L2_SUBDEV_FL_HAS_DEVNODE;
519
520 isp->subdev.entity.function = MEDIA_ENT_F_VID_MUX;
521 isp->subdev.entity.ops = &risp_entity_ops;
522
523 isp->pads[RCAR_ISP_SINK].flags = MEDIA_PAD_FL_SINK;
524 for (i = RCAR_ISP_PORT0; i < RCAR_ISP_NUM_PADS; i++)
525 isp->pads[i].flags = MEDIA_PAD_FL_SOURCE;
526
527 ret = media_entity_pads_init(&isp->subdev.entity, RCAR_ISP_NUM_PADS,
528 isp->pads);
529 if (ret)
530 goto error_notifier;
531
532 ret = v4l2_subdev_init_finalize(&isp->subdev);
533 if (ret)
534 goto error_notifier;
535
536 ret = v4l2_async_register_subdev(&isp->subdev);
537 if (ret < 0)
538 goto error_subdev;
539
540 dev_info(isp->dev, "Using CSI-2 input: %u\n", isp->csi_input);
541
542 return 0;
543
544 error_subdev:
545 v4l2_subdev_cleanup(&isp->subdev);
546 error_notifier:
547 v4l2_async_nf_unregister(&isp->notifier);
548 v4l2_async_nf_cleanup(&isp->notifier);
549 error_pm:
550 pm_runtime_disable(&pdev->dev);
551
552 return ret;
553 }
554
risp_remove(struct platform_device * pdev)555 static void risp_remove(struct platform_device *pdev)
556 {
557 struct rcar_isp *isp = platform_get_drvdata(pdev);
558
559 v4l2_async_nf_unregister(&isp->notifier);
560 v4l2_async_nf_cleanup(&isp->notifier);
561
562 v4l2_async_unregister_subdev(&isp->subdev);
563 v4l2_subdev_cleanup(&isp->subdev);
564
565 pm_runtime_disable(&pdev->dev);
566 }
567
568 static struct platform_driver rcar_isp_driver = {
569 .driver = {
570 .name = "rcar-isp",
571 .suppress_bind_attrs = true,
572 .of_match_table = risp_of_id_table,
573 },
574 .probe = risp_probe,
575 .remove = risp_remove,
576 };
577
578 module_platform_driver(rcar_isp_driver);
579
580 MODULE_AUTHOR("Niklas Söderlund <niklas.soderlund@ragnatech.se>");
581 MODULE_DESCRIPTION("Renesas R-Car ISP Channel Selector driver");
582 MODULE_LICENSE("GPL");
583