microchip-csi2dc.c

  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 */
114struct csi2dc_format {
115	u32				mbus_code;
116	u32				dt;
117};
118
119static 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
150enum 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 */
183struct 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
209static inline struct csi2dc_device *
210csi2dc_sd_to_csi2dc_device(struct v4l2_subdev *csi2dc_sd)
211{
212	return container_of(csi2dc_sd, struct csi2dc_device, csi2dc_sd);
213}
214
215static 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
227static 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
247static 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
309static 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
340static 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
370static 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
406static 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
438static 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
456static const struct media_entity_operations csi2dc_entity_ops = {
457	.link_validate = v4l2_subdev_link_validate,
458};
459
460static 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
466static const struct v4l2_subdev_video_ops csi2dc_video_ops = {
467	.s_stream = csi2dc_s_stream,
468};
469
470static const struct v4l2_subdev_ops csi2dc_subdev_ops = {
471	.pad = &csi2dc_pad_ops,
472	.video = &csi2dc_video_ops,
473};
474
475static const struct v4l2_subdev_internal_ops csi2dc_internal_ops = {
476	.init_state = csi2dc_init_state,
477};
478
479static 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
518static const struct v4l2_async_notifier_operations csi2dc_async_ops = {
519	.bound = csi2dc_async_bound,
520};
521
522static 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
557static 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
630csi2dc_of_parse_err:
631	fwnode_handle_put(input_fwnode);
632	return ret;
633}
634
635static 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
649static 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
738csi2dc_probe_cleanup_notifier:
739	v4l2_async_nf_cleanup(&csi2dc->notifier);
740csi2dc_probe_cleanup_entity:
741	media_entity_cleanup(&csi2dc->csi2dc_sd.entity);
742
743	return ret;
744}
745
746static 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
758static 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
765static 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
772static const struct dev_pm_ops csi2dc_dev_pm_ops = {
773	SET_RUNTIME_PM_OPS(csi2dc_runtime_suspend, csi2dc_runtime_resume, NULL)
774};
775
776static const struct of_device_id csi2dc_of_match[] = {
777	{ .compatible = "microchip,sama7g5-csi2dc" },
778	{ }
779};
780
781MODULE_DEVICE_TABLE(of, csi2dc_of_match);
782
783static struct platform_driver csi2dc_driver = {
784	.probe	= csi2dc_probe,
785	.remove = 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
793module_platform_driver(csi2dc_driver);
794
795MODULE_AUTHOR("Eugen Hristev <eugen.hristev@microchip.com>");
796MODULE_DESCRIPTION("Microchip CSI2 Demux Controller driver");
797MODULE_LICENSE("GPL v2");