1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Microchip CSI2 Demux Controller (CSI2DC) driver
4 *
5 * Copyright (C) 2018 Microchip Technology, Inc.
6 *
7 * Author: Eugen Hristev <eugen.hristev@microchip.com>
8 *
9 */
10
11 #include <linux/clk.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/module.h>
14 #include <linux/of_graph.h>
15 #include <linux/platform_device.h>
16 #include <linux/pm_runtime.h>
17 #include <linux/videodev2.h>
18
19 #include <media/v4l2-fwnode.h>
20 #include <media/v4l2-subdev.h>
21
22 /* Global configuration register */
23 #define CSI2DC_GCFG 0x0
24
25 /* MIPI sensor pixel clock is free running */
26 #define CSI2DC_GCFG_MIPIFRN BIT(0)
27 /* GPIO parallel interface selection */
28 #define CSI2DC_GCFG_GPIOSEL BIT(1)
29 /* Output waveform inter-line minimum delay */
30 #define CSI2DC_GCFG_HLC(v) ((v) << 4)
31 #define CSI2DC_GCFG_HLC_MASK GENMASK(7, 4)
32 /* SAMA7G5 requires a HLC delay of 15 */
33 #define SAMA7G5_HLC (15)
34
35 /* Global control register */
36 #define CSI2DC_GCTLR 0x04
37 #define CSI2DC_GCTLR_SWRST BIT(0)
38
39 /* Global status register */
40 #define CSI2DC_GS 0x08
41
42 /* SSP interrupt status register */
43 #define CSI2DC_SSPIS 0x28
44 /* Pipe update register */
45 #define CSI2DC_PU 0xc0
46 /* Video pipe attributes update */
47 #define CSI2DC_PU_VP BIT(0)
48
49 /* Pipe update status register */
50 #define CSI2DC_PUS 0xc4
51
52 /* Video pipeline Interrupt Status Register */
53 #define CSI2DC_VPISR 0xf4
54
55 /* Video pipeline enable register */
56 #define CSI2DC_VPE 0xf8
57 #define CSI2DC_VPE_ENABLE BIT(0)
58
59 /* Video pipeline configuration register */
60 #define CSI2DC_VPCFG 0xfc
61 /* Data type */
62 #define CSI2DC_VPCFG_DT(v) ((v) << 0)
63 #define CSI2DC_VPCFG_DT_MASK GENMASK(5, 0)
64 /* Virtual channel identifier */
65 #define CSI2DC_VPCFG_VC(v) ((v) << 6)
66 #define CSI2DC_VPCFG_VC_MASK GENMASK(7, 6)
67 /* Decompression enable */
68 #define CSI2DC_VPCFG_DE BIT(8)
69 /* Decoder mode */
70 #define CSI2DC_VPCFG_DM(v) ((v) << 9)
71 #define CSI2DC_VPCFG_DM_DECODER8TO12 0
72 /* Decoder predictor 2 selection */
73 #define CSI2DC_VPCFG_DP2 BIT(12)
74 /* Recommended memory storage */
75 #define CSI2DC_VPCFG_RMS BIT(13)
76 /* Post adjustment */
77 #define CSI2DC_VPCFG_PA BIT(14)
78
79 /* Video pipeline column register */
80 #define CSI2DC_VPCOL 0x100
81 /* Column number */
82 #define CSI2DC_VPCOL_COL(v) ((v) << 0)
83 #define CSI2DC_VPCOL_COL_MASK GENMASK(15, 0)
84
85 /* Video pipeline row register */
86 #define CSI2DC_VPROW 0x104
87 /* Row number */
88 #define CSI2DC_VPROW_ROW(v) ((v) << 0)
89 #define CSI2DC_VPROW_ROW_MASK GENMASK(15, 0)
90
91 /* Version register */
92 #define CSI2DC_VERSION 0x1fc
93
94 /* register read/write helpers */
95 #define csi2dc_readl(st, reg) readl_relaxed((st)->base + (reg))
96 #define csi2dc_writel(st, reg, val) writel_relaxed((val), \
97 (st)->base + (reg))
98
99 /* supported RAW data types */
100 #define CSI2DC_DT_RAW6 0x28
101 #define CSI2DC_DT_RAW7 0x29
102 #define CSI2DC_DT_RAW8 0x2a
103 #define CSI2DC_DT_RAW10 0x2b
104 #define CSI2DC_DT_RAW12 0x2c
105 #define CSI2DC_DT_RAW14 0x2d
106 /* YUV data types */
107 #define CSI2DC_DT_YUV422_8B 0x1e
108
109 /*
110 * struct csi2dc_format - CSI2DC format type struct
111 * @mbus_code: Media bus code for the format
112 * @dt: Data type constant for this format
113 */
114 struct csi2dc_format {
115 u32 mbus_code;
116 u32 dt;
117 };
118
119 static const struct csi2dc_format csi2dc_formats[] = {
120 {
121 .mbus_code = MEDIA_BUS_FMT_SRGGB8_1X8,
122 .dt = CSI2DC_DT_RAW8,
123 }, {
124 .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
125 .dt = CSI2DC_DT_RAW8,
126 }, {
127 .mbus_code = MEDIA_BUS_FMT_SGRBG8_1X8,
128 .dt = CSI2DC_DT_RAW8,
129 }, {
130 .mbus_code = MEDIA_BUS_FMT_SGBRG8_1X8,
131 .dt = CSI2DC_DT_RAW8,
132 }, {
133 .mbus_code = MEDIA_BUS_FMT_SRGGB10_1X10,
134 .dt = CSI2DC_DT_RAW10,
135 }, {
136 .mbus_code = MEDIA_BUS_FMT_SBGGR10_1X10,
137 .dt = CSI2DC_DT_RAW10,
138 }, {
139 .mbus_code = MEDIA_BUS_FMT_SGRBG10_1X10,
140 .dt = CSI2DC_DT_RAW10,
141 }, {
142 .mbus_code = MEDIA_BUS_FMT_SGBRG10_1X10,
143 .dt = CSI2DC_DT_RAW10,
144 }, {
145 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
146 .dt = CSI2DC_DT_YUV422_8B,
147 },
148 };
149
150 enum mipi_csi_pads {
151 CSI2DC_PAD_SINK = 0,
152 CSI2DC_PAD_SOURCE = 1,
153 CSI2DC_PADS_NUM = 2,
154 };
155
156 /*
157 * struct csi2dc_device - CSI2DC device driver data/config struct
158 * @base: Register map base address
159 * @csi2dc_sd: v4l2 subdevice for the csi2dc device
160 * This is the subdevice that the csi2dc device itself
161 * registers in v4l2 subsystem
162 * @dev: struct device for this csi2dc device
163 * @pclk: Peripheral clock reference
164 * Input clock that clocks the hardware block internal
165 * logic
166 * @scck: Sensor Controller clock reference
167 * Input clock that is used to generate the pixel clock
168 * @format: Current saved format used in g/s fmt
169 * @cur_fmt: Current state format
170 * @try_fmt: Try format that is being tried
171 * @pads: Media entity pads for the csi2dc subdevice
172 * @clk_gated: Whether the clock is gated or free running
173 * @video_pipe: Whether video pipeline is configured
174 * @parallel_mode: The underlying subdevice is connected on a parallel bus
175 * @vc: Current set virtual channel
176 * @notifier: Async notifier that is used to bound the underlying
177 * subdevice to the csi2dc subdevice
178 * @input_sd: Reference to the underlying subdevice bound to the
179 * csi2dc subdevice
180 * @remote_pad: Pad number of the underlying subdevice that is linked
181 * to the csi2dc subdevice sink pad.
182 */
183 struct csi2dc_device {
184 void __iomem *base;
185 struct v4l2_subdev csi2dc_sd;
186 struct device *dev;
187 struct clk *pclk;
188 struct clk *scck;
189
190 struct v4l2_mbus_framefmt format;
191
192 const struct csi2dc_format *cur_fmt;
193 const struct csi2dc_format *try_fmt;
194
195 struct media_pad pads[CSI2DC_PADS_NUM];
196
197 bool clk_gated;
198 bool video_pipe;
199 bool parallel_mode;
200 u32 vc;
201
202 struct v4l2_async_notifier notifier;
203
204 struct v4l2_subdev *input_sd;
205
206 u32 remote_pad;
207 };
208
209 static inline struct csi2dc_device *
csi2dc_sd_to_csi2dc_device(struct v4l2_subdev * csi2dc_sd)210 csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd)
211 {
212 return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd);
213 }
214
csi2dc_enum_mbus_code(struct v4l2_subdev * csi2dc_sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)215 static int csi2dc_enum_mbus_code(struct v4l2_subdev *csi2dc_sd,
216 struct v4l2_subdev_state *sd_state,
217 struct v4l2_subdev_mbus_code_enum *code)
218 {
219 if (code->index >= ARRAY_SIZE(csi2dc_formats))
220 return -EINVAL;
221
222 code->code = csi2dc_formats[code->index].mbus_code;
223
224 return 0;
225 }
226
csi2dc_get_fmt(struct v4l2_subdev * csi2dc_sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * format)227 static int csi2dc_get_fmt(struct v4l2_subdev *csi2dc_sd,
228 struct v4l2_subdev_state *sd_state,
229 struct v4l2_subdev_format *format)
230 {
231 struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
232 struct v4l2_mbus_framefmt *v4l2_try_fmt;
233
234 if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
235 v4l2_try_fmt = v4l2_subdev_state_get_format(sd_state,
236 format->pad);
237 format->format = *v4l2_try_fmt;
238
239 return 0;
240 }
241
242 format->format = csi2dc->format;
243
244 return 0;
245 }
246
csi2dc_set_fmt(struct v4l2_subdev * csi2dc_sd,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * req_fmt)247 static int csi2dc_set_fmt(struct v4l2_subdev *csi2dc_sd,
248 struct v4l2_subdev_state *sd_state,
249 struct v4l2_subdev_format *req_fmt)
250 {
251 struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
252 const struct csi2dc_format *fmt, *try_fmt = NULL;
253 struct v4l2_mbus_framefmt *v4l2_try_fmt;
254 unsigned int i;
255
256 /*
257 * Setting the source pad is disabled.
258 * The same format is being propagated from the sink to source.
259 */
260 if (req_fmt->pad == CSI2DC_PAD_SOURCE)
261 return -EINVAL;
262
263 for (i = 0; i < ARRAY_SIZE(csi2dc_formats); i++) {
264 fmt = &csi2dc_formats[i];
265 if (req_fmt->format.code == fmt->mbus_code)
266 try_fmt = fmt;
267 fmt++;
268 }
269
270 /* in case we could not find the desired format, default to something */
271 if (!try_fmt) {
272 try_fmt = &csi2dc_formats[0];
273
274 dev_dbg(csi2dc->dev,
275 "CSI2DC unsupported format 0x%x, defaulting to 0x%x\n",
276 req_fmt->format.code, csi2dc_formats[0].mbus_code);
277 }
278
279 req_fmt->format.code = try_fmt->mbus_code;
280 req_fmt->format.colorspace = V4L2_COLORSPACE_SRGB;
281 req_fmt->format.field = V4L2_FIELD_NONE;
282
283 if (req_fmt->which == V4L2_SUBDEV_FORMAT_TRY) {
284 v4l2_try_fmt = v4l2_subdev_state_get_format(sd_state,
285 req_fmt->pad);
286 *v4l2_try_fmt = req_fmt->format;
287 /* Trying on the sink pad makes the source pad change too */
288 v4l2_try_fmt = v4l2_subdev_state_get_format(sd_state,
289 CSI2DC_PAD_SOURCE);
290 *v4l2_try_fmt = req_fmt->format;
291
292 /* if we are just trying, we are done */
293 return 0;
294 }
295
296 /* save the format for later requests */
297 csi2dc->format = req_fmt->format;
298
299 /* update config */
300 csi2dc->cur_fmt = try_fmt;
301
302 dev_dbg(csi2dc->dev, "new format set: 0x%x @%dx%d\n",
303 csi2dc->format.code, csi2dc->format.width,
304 csi2dc->format.height);
305
306 return 0;
307 }
308
csi2dc_power(struct csi2dc_device * csi2dc,int on)309 static int csi2dc_power(struct csi2dc_device *csi2dc, int on)
310 {
311 int ret = 0;
312
313 if (on) {
314 ret = clk_prepare_enable(csi2dc->pclk);
315 if (ret) {
316 dev_err(csi2dc->dev, "failed to enable pclk:%d\n", ret);
317 return ret;
318 }
319
320 ret = clk_prepare_enable(csi2dc->scck);
321 if (ret) {
322 dev_err(csi2dc->dev, "failed to enable scck:%d\n", ret);
323 clk_disable_unprepare(csi2dc->pclk);
324 return ret;
325 }
326
327 /* if powering up, deassert reset line */
328 csi2dc_writel(csi2dc, CSI2DC_GCTLR, CSI2DC_GCTLR_SWRST);
329 } else {
330 /* if powering down, assert reset line */
331 csi2dc_writel(csi2dc, CSI2DC_GCTLR, 0);
332
333 clk_disable_unprepare(csi2dc->scck);
334 clk_disable_unprepare(csi2dc->pclk);
335 }
336
337 return ret;
338 }
339
csi2dc_get_mbus_config(struct csi2dc_device * csi2dc)340 static int csi2dc_get_mbus_config(struct csi2dc_device *csi2dc)
341 {
342 struct v4l2_mbus_config mbus_config = { 0 };
343 int ret;
344
345 ret = v4l2_subdev_call(csi2dc->input_sd, pad, get_mbus_config,
346 csi2dc->remote_pad, &mbus_config);
347 if (ret == -ENOIOCTLCMD) {
348 dev_dbg(csi2dc->dev,
349 "no remote mbus configuration available\n");
350 return 0;
351 }
352
353 if (ret) {
354 dev_err(csi2dc->dev,
355 "failed to get remote mbus configuration\n");
356 return 0;
357 }
358
359 dev_dbg(csi2dc->dev, "subdev sending on channel %d\n", csi2dc->vc);
360
361 csi2dc->clk_gated = mbus_config.bus.parallel.flags &
362 V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
363
364 dev_dbg(csi2dc->dev, "mbus_config: %s clock\n",
365 csi2dc->clk_gated ? "gated" : "free running");
366
367 return 0;
368 }
369
csi2dc_vp_update(struct csi2dc_device * csi2dc)370 static void csi2dc_vp_update(struct csi2dc_device *csi2dc)
371 {
372 u32 vp, gcfg;
373
374 if (!csi2dc->video_pipe) {
375 dev_err(csi2dc->dev, "video pipeline unavailable\n");
376 return;
377 }
378
379 if (csi2dc->parallel_mode) {
380 /* In parallel mode, GPIO parallel interface must be selected */
381 gcfg = csi2dc_readl(csi2dc, CSI2DC_GCFG);
382 gcfg |= CSI2DC_GCFG_GPIOSEL;
383 csi2dc_writel(csi2dc, CSI2DC_GCFG, gcfg);
384 return;
385 }
386
387 /* serial video pipeline */
388
389 csi2dc_writel(csi2dc, CSI2DC_GCFG,
390 (SAMA7G5_HLC & CSI2DC_GCFG_HLC_MASK) |
391 (csi2dc->clk_gated ? 0 : CSI2DC_GCFG_MIPIFRN));
392
393 vp = CSI2DC_VPCFG_DT(csi2dc->cur_fmt->dt) & CSI2DC_VPCFG_DT_MASK;
394 vp |= CSI2DC_VPCFG_VC(csi2dc->vc) & CSI2DC_VPCFG_VC_MASK;
395 vp &= ~CSI2DC_VPCFG_DE;
396 vp |= CSI2DC_VPCFG_DM(CSI2DC_VPCFG_DM_DECODER8TO12);
397 vp &= ~CSI2DC_VPCFG_DP2;
398 vp &= ~CSI2DC_VPCFG_RMS;
399 vp |= CSI2DC_VPCFG_PA;
400
401 csi2dc_writel(csi2dc, CSI2DC_VPCFG, vp);
402 csi2dc_writel(csi2dc, CSI2DC_VPE, CSI2DC_VPE_ENABLE);
403 csi2dc_writel(csi2dc, CSI2DC_PU, CSI2DC_PU_VP);
404 }
405
csi2dc_s_stream(struct v4l2_subdev * csi2dc_sd,int enable)406 static int csi2dc_s_stream(struct v4l2_subdev *csi2dc_sd, int enable)
407 {
408 struct csi2dc_device *csi2dc = csi2dc_sd_to_csi2dc_device(csi2dc_sd);
409 int ret;
410
411 if (enable) {
412 ret = pm_runtime_resume_and_get(csi2dc->dev);
413 if (ret < 0)
414 return ret;
415
416 csi2dc_get_mbus_config(csi2dc);
417
418 csi2dc_vp_update(csi2dc);
419
420 return v4l2_subdev_call(csi2dc->input_sd, video, s_stream,
421 true);
422 }
423
424 dev_dbg(csi2dc->dev,
425 "Last frame received: VPCOLR = %u, VPROWR= %u, VPISR = %x\n",
426 csi2dc_readl(csi2dc, CSI2DC_VPCOL),
427 csi2dc_readl(csi2dc, CSI2DC_VPROW),
428 csi2dc_readl(csi2dc, CSI2DC_VPISR));
429
430 /* stop streaming scenario */
431 ret = v4l2_subdev_call(csi2dc->input_sd, video, s_stream, false);
432
433 pm_runtime_put_sync(csi2dc->dev);
434
435 return ret;
436 }
437
csi2dc_init_state(struct v4l2_subdev * csi2dc_sd,struct v4l2_subdev_state * sd_state)438 static int csi2dc_init_state(struct v4l2_subdev *csi2dc_sd,
439 struct v4l2_subdev_state *sd_state)
440 {
441 struct v4l2_mbus_framefmt *v4l2_try_fmt =
442 v4l2_subdev_state_get_format(sd_state, 0);
443
444 v4l2_try_fmt->height = 480;
445 v4l2_try_fmt->width = 640;
446 v4l2_try_fmt->code = csi2dc_formats[0].mbus_code;
447 v4l2_try_fmt->colorspace = V4L2_COLORSPACE_SRGB;
448 v4l2_try_fmt->field = V4L2_FIELD_NONE;
449 v4l2_try_fmt->ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
450 v4l2_try_fmt->quantization = V4L2_QUANTIZATION_DEFAULT;
451 v4l2_try_fmt->xfer_func = V4L2_XFER_FUNC_DEFAULT;
452
453 return 0;
454 }
455
456 static const struct media_entity_operations csi2dc_entity_ops = {
457 .link_validate = v4l2_subdev_link_validate,
458 };
459
460 static const struct v4l2_subdev_pad_ops csi2dc_pad_ops = {
461 .enum_mbus_code = csi2dc_enum_mbus_code,
462 .set_fmt = csi2dc_set_fmt,
463 .get_fmt = csi2dc_get_fmt,
464 };
465
466 static const struct v4l2_subdev_video_ops csi2dc_video_ops = {
467 .s_stream = csi2dc_s_stream,
468 };
469
470 static const struct v4l2_subdev_ops csi2dc_subdev_ops = {
471 .pad = &csi2dc_pad_ops,
472 .video = &csi2dc_video_ops,
473 };
474
475 static const struct v4l2_subdev_internal_ops csi2dc_internal_ops = {
476 .init_state = csi2dc_init_state,
477 };
478
csi2dc_async_bound(struct v4l2_async_notifier * notifier,struct v4l2_subdev * subdev,struct v4l2_async_connection * asd)479 static int csi2dc_async_bound(struct v4l2_async_notifier *notifier,
480 struct v4l2_subdev *subdev,
481 struct v4l2_async_connection *asd)
482 {
483 struct csi2dc_device *csi2dc = container_of(notifier,
484 struct csi2dc_device, notifier);
485 int pad;
486 int ret;
487
488 csi2dc->input_sd = subdev;
489
490 pad = media_entity_get_fwnode_pad(&subdev->entity, asd->match.fwnode,
491 MEDIA_PAD_FL_SOURCE);
492 if (pad < 0) {
493 dev_err(csi2dc->dev, "Failed to find pad for %s\n",
494 subdev->name);
495 return pad;
496 }
497
498 csi2dc->remote_pad = pad;
499
500 ret = media_create_pad_link(&csi2dc->input_sd->entity,
501 csi2dc->remote_pad,
502 &csi2dc->csi2dc_sd.entity, 0,
503 MEDIA_LNK_FL_ENABLED);
504 if (ret) {
505 dev_err(csi2dc->dev,
506 "Failed to create pad link: %s to %s\n",
507 csi2dc->input_sd->entity.name,
508 csi2dc->csi2dc_sd.entity.name);
509 return ret;
510 }
511
512 dev_dbg(csi2dc->dev, "link with %s pad: %d\n",
513 csi2dc->input_sd->name, csi2dc->remote_pad);
514
515 return ret;
516 }
517
518 static const struct v4l2_async_notifier_operations csi2dc_async_ops = {
519 .bound = csi2dc_async_bound,
520 };
521
csi2dc_prepare_notifier(struct csi2dc_device * csi2dc,struct fwnode_handle * input_fwnode)522 static int csi2dc_prepare_notifier(struct csi2dc_device *csi2dc,
523 struct fwnode_handle *input_fwnode)
524 {
525 struct v4l2_async_connection *asd;
526 int ret = 0;
527
528 v4l2_async_subdev_nf_init(&csi2dc->notifier, &csi2dc->csi2dc_sd);
529
530 asd = v4l2_async_nf_add_fwnode_remote(&csi2dc->notifier,
531 input_fwnode,
532 struct v4l2_async_connection);
533
534 fwnode_handle_put(input_fwnode);
535
536 if (IS_ERR(asd)) {
537 ret = PTR_ERR(asd);
538 dev_err(csi2dc->dev,
539 "failed to add async notifier for node %pOF: %d\n",
540 to_of_node(input_fwnode), ret);
541 v4l2_async_nf_cleanup(&csi2dc->notifier);
542 return ret;
543 }
544
545 csi2dc->notifier.ops = &csi2dc_async_ops;
546
547 ret = v4l2_async_nf_register(&csi2dc->notifier);
548 if (ret) {
549 dev_err(csi2dc->dev, "fail to register async notifier: %d\n",
550 ret);
551 v4l2_async_nf_cleanup(&csi2dc->notifier);
552 }
553
554 return ret;
555 }
556
csi2dc_of_parse(struct csi2dc_device * csi2dc,struct device_node * of_node)557 static int csi2dc_of_parse(struct csi2dc_device *csi2dc,
558 struct device_node *of_node)
559 {
560 struct fwnode_handle *input_fwnode, *output_fwnode;
561 struct v4l2_fwnode_endpoint input_endpoint = { 0 },
562 output_endpoint = { 0 };
563 int ret;
564
565 input_fwnode = fwnode_graph_get_next_endpoint(of_fwnode_handle(of_node),
566 NULL);
567 if (!input_fwnode) {
568 dev_err(csi2dc->dev,
569 "missing port node at %pOF, input node is mandatory.\n",
570 of_node);
571 return -EINVAL;
572 }
573
574 ret = v4l2_fwnode_endpoint_parse(input_fwnode, &input_endpoint);
575 if (ret) {
576 dev_err(csi2dc->dev, "endpoint not defined at %pOF\n", of_node);
577 goto csi2dc_of_parse_err;
578 }
579
580 if (input_endpoint.bus_type == V4L2_MBUS_PARALLEL ||
581 input_endpoint.bus_type == V4L2_MBUS_BT656) {
582 csi2dc->parallel_mode = true;
583 dev_dbg(csi2dc->dev,
584 "subdevice connected on parallel interface\n");
585 }
586
587 if (input_endpoint.bus_type == V4L2_MBUS_CSI2_DPHY) {
588 csi2dc->clk_gated = input_endpoint.bus.mipi_csi2.flags &
589 V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
590 dev_dbg(csi2dc->dev,
591 "subdevice connected on serial interface\n");
592 dev_dbg(csi2dc->dev, "DT: %s clock\n",
593 csi2dc->clk_gated ? "gated" : "free running");
594 }
595
596 output_fwnode = fwnode_graph_get_next_endpoint
597 (of_fwnode_handle(of_node), input_fwnode);
598
599 if (output_fwnode)
600 ret = v4l2_fwnode_endpoint_parse(output_fwnode,
601 &output_endpoint);
602
603 fwnode_handle_put(output_fwnode);
604
605 if (!output_fwnode || ret) {
606 dev_info(csi2dc->dev,
607 "missing output node at %pOF, data pipe available only.\n",
608 of_node);
609 } else {
610 if (output_endpoint.bus_type != V4L2_MBUS_PARALLEL &&
611 output_endpoint.bus_type != V4L2_MBUS_BT656) {
612 dev_err(csi2dc->dev,
613 "output port must be parallel/bt656.\n");
614 ret = -EINVAL;
615 goto csi2dc_of_parse_err;
616 }
617
618 csi2dc->video_pipe = true;
619
620 dev_dbg(csi2dc->dev,
621 "block %pOF [%d.%d]->[%d.%d] video pipeline\n",
622 of_node, input_endpoint.base.port,
623 input_endpoint.base.id, output_endpoint.base.port,
624 output_endpoint.base.id);
625 }
626
627 /* prepare async notifier for subdevice completion */
628 return csi2dc_prepare_notifier(csi2dc, input_fwnode);
629
630 csi2dc_of_parse_err:
631 fwnode_handle_put(input_fwnode);
632 return ret;
633 }
634
csi2dc_default_format(struct csi2dc_device * csi2dc)635 static void csi2dc_default_format(struct csi2dc_device *csi2dc)
636 {
637 csi2dc->cur_fmt = &csi2dc_formats[0];
638
639 csi2dc->format.height = 480;
640 csi2dc->format.width = 640;
641 csi2dc->format.code = csi2dc_formats[0].mbus_code;
642 csi2dc->format.colorspace = V4L2_COLORSPACE_SRGB;
643 csi2dc->format.field = V4L2_FIELD_NONE;
644 csi2dc->format.ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT;
645 csi2dc->format.quantization = V4L2_QUANTIZATION_DEFAULT;
646 csi2dc->format.xfer_func = V4L2_XFER_FUNC_DEFAULT;
647 }
648
csi2dc_probe(struct platform_device * pdev)649 static int csi2dc_probe(struct platform_device *pdev)
650 {
651 struct device *dev = &pdev->dev;
652 struct csi2dc_device *csi2dc;
653 int ret = 0;
654 u32 ver;
655
656 csi2dc = devm_kzalloc(dev, sizeof(*csi2dc), GFP_KERNEL);
657 if (!csi2dc)
658 return -ENOMEM;
659
660 csi2dc->dev = dev;
661
662 csi2dc->base = devm_platform_ioremap_resource(pdev, 0);
663 if (IS_ERR(csi2dc->base)) {
664 dev_err(dev, "base address not set\n");
665 return PTR_ERR(csi2dc->base);
666 }
667
668 csi2dc->pclk = devm_clk_get(dev, "pclk");
669 if (IS_ERR(csi2dc->pclk)) {
670 ret = PTR_ERR(csi2dc->pclk);
671 dev_err(dev, "failed to get pclk: %d\n", ret);
672 return ret;
673 }
674
675 csi2dc->scck = devm_clk_get(dev, "scck");
676 if (IS_ERR(csi2dc->scck)) {
677 ret = PTR_ERR(csi2dc->scck);
678 dev_err(dev, "failed to get scck: %d\n", ret);
679 return ret;
680 }
681
682 v4l2_subdev_init(&csi2dc->csi2dc_sd, &csi2dc_subdev_ops);
683 csi2dc->csi2dc_sd.internal_ops = &csi2dc_internal_ops;
684
685 csi2dc->csi2dc_sd.owner = THIS_MODULE;
686 csi2dc->csi2dc_sd.dev = dev;
687 snprintf(csi2dc->csi2dc_sd.name, sizeof(csi2dc->csi2dc_sd.name),
688 "csi2dc");
689
690 csi2dc->csi2dc_sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
691 csi2dc->csi2dc_sd.entity.function = MEDIA_ENT_F_VID_IF_BRIDGE;
692 csi2dc->csi2dc_sd.entity.ops = &csi2dc_entity_ops;
693
694 platform_set_drvdata(pdev, csi2dc);
695
696 ret = csi2dc_of_parse(csi2dc, dev->of_node);
697 if (ret)
698 goto csi2dc_probe_cleanup_entity;
699
700 csi2dc->pads[CSI2DC_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
701 if (csi2dc->video_pipe)
702 csi2dc->pads[CSI2DC_PAD_SOURCE].flags = MEDIA_PAD_FL_SOURCE;
703
704 ret = media_entity_pads_init(&csi2dc->csi2dc_sd.entity,
705 csi2dc->video_pipe ? CSI2DC_PADS_NUM : 1,
706 csi2dc->pads);
707 if (ret < 0) {
708 dev_err(dev, "media entity init failed\n");
709 goto csi2dc_probe_cleanup_notifier;
710 }
711
712 csi2dc_default_format(csi2dc);
713
714 /* turn power on to validate capabilities */
715 ret = csi2dc_power(csi2dc, true);
716 if (ret < 0)
717 goto csi2dc_probe_cleanup_notifier;
718
719 pm_runtime_set_active(dev);
720 pm_runtime_enable(dev);
721 ver = csi2dc_readl(csi2dc, CSI2DC_VERSION);
722
723 /*
724 * we must register the subdev after PM runtime has been requested,
725 * otherwise we might bound immediately and request pm_runtime_resume
726 * before runtime_enable.
727 */
728 ret = v4l2_async_register_subdev(&csi2dc->csi2dc_sd);
729 if (ret) {
730 dev_err(csi2dc->dev, "failed to register the subdevice\n");
731 goto csi2dc_probe_cleanup_notifier;
732 }
733
734 dev_info(dev, "Microchip CSI2DC version %x\n", ver);
735
736 return 0;
737
738 csi2dc_probe_cleanup_notifier:
739 v4l2_async_nf_cleanup(&csi2dc->notifier);
740 csi2dc_probe_cleanup_entity:
741 media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
742
743 return ret;
744 }
745
csi2dc_remove(struct platform_device * pdev)746 static void csi2dc_remove(struct platform_device *pdev)
747 {
748 struct csi2dc_device *csi2dc = platform_get_drvdata(pdev);
749
750 pm_runtime_disable(&pdev->dev);
751
752 v4l2_async_unregister_subdev(&csi2dc->csi2dc_sd);
753 v4l2_async_nf_unregister(&csi2dc->notifier);
754 v4l2_async_nf_cleanup(&csi2dc->notifier);
755 media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
756 }
757
csi2dc_runtime_suspend(struct device * dev)758 static int __maybe_unused csi2dc_runtime_suspend(struct device *dev)
759 {
760 struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
761
762 return csi2dc_power(csi2dc, false);
763 }
764
csi2dc_runtime_resume(struct device * dev)765 static int __maybe_unused csi2dc_runtime_resume(struct device *dev)
766 {
767 struct csi2dc_device *csi2dc = dev_get_drvdata(dev);
768
769 return csi2dc_power(csi2dc, true);
770 }
771
772 static const struct dev_pm_ops csi2dc_dev_pm_ops = {
773 SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL)
774 };
775
776 static const struct of_device_id csi2dc_of_match[] = {
777 { .compatible = "microchip,sama7g5-csi2dc" },
778 { }
779 };
780
781 MODULE_DEVICE_TABLE(of, csi2dc_of_match);
782
783 static struct platform_driver csi2dc_driver = {
784 .probe = csi2dc_probe,
785 .remove_new = csi2dc_remove,
786 .driver = {
787 .name = "microchip-csi2dc",
788 .pm = &csi2dc_dev_pm_ops,
789 .of_match_table = of_match_ptr(csi2dc_of_match),
790 },
791 };
792
793 module_platform_driver(csi2dc_driver);
794
795 MODULE_AUTHOR("Eugen Hristev <eugen.hristev@microchip.com>");
796 MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver");
797 MODULE_LICENSE("GPL v2");
798