[mirror_ubuntu-artful-kernel.git] / drivers / media / platform / vsp1 / vsp1_lif.c

/*
 * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/device.h>
#include <linux/gfp.h>

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_lif.h"

#define LIF_MIN_SIZE				2U
#define LIF_MAX_SIZE				2048U

/* -----------------------------------------------------------------------------
 * Device Access
 */

static inline u32 vsp1_lif_read(struct vsp1_lif *lif, u32 reg)
{
	return vsp1_read(lif->entity.vsp1, reg);
}

static inline void vsp1_lif_write(struct vsp1_lif *lif, u32 reg, u32 data)
{
	vsp1_write(lif->entity.vsp1, reg, data);
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Core Operations
 */

static int lif_s_stream(struct v4l2_subdev *subdev, int enable)
{
	const struct v4l2_mbus_framefmt *format;
	struct vsp1_lif *lif = to_lif(subdev);
	unsigned int hbth = 1300;
	unsigned int obth = 400;
	unsigned int lbth = 200;

	if (!enable) {
		vsp1_lif_write(lif, VI6_LIF_CTRL, 0);
		return 0;
	}

	format = &lif->entity.formats[LIF_PAD_SOURCE];

	obth = min(obth, (format->width + 1) / 2 * format->height - 4);

	vsp1_lif_write(lif, VI6_LIF_CSBTH,
			(hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
			(lbth << VI6_LIF_CSBTH_LBTH_SHIFT));

	vsp1_lif_write(lif, VI6_LIF_CTRL,
			(obth << VI6_LIF_CTRL_OBTH_SHIFT) |
			(format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) |
			VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN);

	return 0;
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Pad Operations
 */

static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
			      struct v4l2_subdev_pad_config *cfg,
			      struct v4l2_subdev_mbus_code_enum *code)
{
	static const unsigned int codes[] = {
		MEDIA_BUS_FMT_ARGB8888_1X32,
		MEDIA_BUS_FMT_AYUV8_1X32,
	};
	struct vsp1_lif *lif = to_lif(subdev);

	if (code->pad == LIF_PAD_SINK) {
		if (code->index >= ARRAY_SIZE(codes))
			return -EINVAL;

		code->code = codes[code->index];
	} else {
		struct v4l2_mbus_framefmt *format;

		/* The LIF can't perform format conversion, the sink format is
		 * always identical to the source format.
		 */
		if (code->index)
			return -EINVAL;

		format = vsp1_entity_get_pad_format(&lif->entity, cfg,
						    LIF_PAD_SINK, code->which);
		code->code = format->code;
	}

	return 0;
}

static int lif_enum_frame_size(struct v4l2_subdev *subdev,
			       struct v4l2_subdev_pad_config *cfg,
			       struct v4l2_subdev_frame_size_enum *fse)
{
	struct vsp1_lif *lif = to_lif(subdev);
	struct v4l2_mbus_framefmt *format;

	format = vsp1_entity_get_pad_format(&lif->entity, cfg, LIF_PAD_SINK,
					    fse->which);

	if (fse->index || fse->code != format->code)
		return -EINVAL;

	if (fse->pad == LIF_PAD_SINK) {
		fse->min_width = LIF_MIN_SIZE;
		fse->max_width = LIF_MAX_SIZE;
		fse->min_height = LIF_MIN_SIZE;
		fse->max_height = LIF_MAX_SIZE;
	} else {
		fse->min_width = format->width;
		fse->max_width = format->width;
		fse->min_height = format->height;
		fse->max_height = format->height;
	}

	return 0;
}

static int lif_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
			  struct v4l2_subdev_format *fmt)
{
	struct vsp1_lif *lif = to_lif(subdev);

	fmt->format = *vsp1_entity_get_pad_format(&lif->entity, cfg, fmt->pad,
						  fmt->which);

	return 0;
}

static int lif_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
			  struct v4l2_subdev_format *fmt)
{
	struct vsp1_lif *lif = to_lif(subdev);
	struct v4l2_mbus_framefmt *format;

	/* Default to YUV if the requested format is not supported. */
	if (fmt->format.code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
	    fmt->format.code != MEDIA_BUS_FMT_AYUV8_1X32)
		fmt->format.code = MEDIA_BUS_FMT_AYUV8_1X32;

	format = vsp1_entity_get_pad_format(&lif->entity, cfg, fmt->pad,
					    fmt->which);

	if (fmt->pad == LIF_PAD_SOURCE) {
		/* The LIF source format is always identical to its sink
		 * format.
		 */
		fmt->format = *format;
		return 0;
	}

	format->code = fmt->format.code;
	format->width = clamp_t(unsigned int, fmt->format.width,
				LIF_MIN_SIZE, LIF_MAX_SIZE);
	format->height = clamp_t(unsigned int, fmt->format.height,
				 LIF_MIN_SIZE, LIF_MAX_SIZE);
	format->field = V4L2_FIELD_NONE;
	format->colorspace = V4L2_COLORSPACE_SRGB;

	fmt->format = *format;

	/* Propagate the format to the source pad. */
	format = vsp1_entity_get_pad_format(&lif->entity, cfg, LIF_PAD_SOURCE,
					    fmt->which);
	*format = fmt->format;

	return 0;
}

/* -----------------------------------------------------------------------------
 * V4L2 Subdevice Operations
 */

static struct v4l2_subdev_video_ops lif_video_ops = {
	.s_stream = lif_s_stream,
};

static struct v4l2_subdev_pad_ops lif_pad_ops = {
	.enum_mbus_code = lif_enum_mbus_code,
	.enum_frame_size = lif_enum_frame_size,
	.get_fmt = lif_get_format,
	.set_fmt = lif_set_format,
};

static struct v4l2_subdev_ops lif_ops = {
	.video	= &lif_video_ops,
	.pad    = &lif_pad_ops,
};

/* -----------------------------------------------------------------------------
 * Initialization and Cleanup
 */

struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1)
{
	struct v4l2_subdev *subdev;
	struct vsp1_lif *lif;
	int ret;

	lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
	if (lif == NULL)
		return ERR_PTR(-ENOMEM);

	lif->entity.type = VSP1_ENTITY_LIF;

	ret = vsp1_entity_init(vsp1, &lif->entity, 2);
	if (ret < 0)
		return ERR_PTR(ret);

	/* Initialize the V4L2 subdev. */
	subdev = &lif->entity.subdev;
	v4l2_subdev_init(subdev, &lif_ops);

	subdev->entity.ops = &vsp1_media_ops;
	subdev->internal_ops = &vsp1_subdev_internal_ops;
	snprintf(subdev->name, sizeof(subdev->name), "%s lif",
		 dev_name(vsp1->dev));
	v4l2_set_subdevdata(subdev, lif);
	subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

	vsp1_entity_init_formats(subdev, NULL);

	return lif;
}
Commit	Line	Data
26e0ca22 LP	1	/*
	2	* vsp1_lif.c -- R-Car VSP1 LCD Controller Interface
	3	*
8a1edc55	4	* Copyright (C) 2013-2014 Renesas Electronics Corporation
26e0ca22 LP	5	*
	6	* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*/
	13
	14	#include <linux/device.h>
	15	#include <linux/gfp.h>
	16
	17	#include <media/v4l2-subdev.h>
	18
	19	#include "vsp1.h"
	20	#include "vsp1_lif.h"
	21
	22	#define LIF_MIN_SIZE 2U
	23	#define LIF_MAX_SIZE 2048U
	24
	25	/* -----------------------------------------------------------------------------
	26	* Device Access
	27	*/
	28
	29	static inline u32 vsp1_lif_read(struct vsp1_lif *lif, u32 reg)
	30	{
	31	return vsp1_read(lif->entity.vsp1, reg);
	32	}
	33
	34	static inline void vsp1_lif_write(struct vsp1_lif *lif, u32 reg, u32 data)
	35	{
	36	vsp1_write(lif->entity.vsp1, reg, data);
	37	}
	38
	39	/* -----------------------------------------------------------------------------
	40	* V4L2 Subdevice Core Operations
	41	*/
	42
	43	static int lif_s_stream(struct v4l2_subdev *subdev, int enable)
	44	{
	45	const struct v4l2_mbus_framefmt *format;
	46	struct vsp1_lif *lif = to_lif(subdev);
	47	unsigned int hbth = 1300;
	48	unsigned int obth = 400;
	49	unsigned int lbth = 200;
	50
	51	if (!enable) {
	52	vsp1_lif_write(lif, VI6_LIF_CTRL, 0);
	53	return 0;
	54	}
	55
	56	format = &lif->entity.formats[LIF_PAD_SOURCE];
	57
	58	obth = min(obth, (format->width + 1) / 2 * format->height - 4);
	59
	60	vsp1_lif_write(lif, VI6_LIF_CSBTH,
	61	(hbth << VI6_LIF_CSBTH_HBTH_SHIFT) \|
	62	(lbth << VI6_LIF_CSBTH_LBTH_SHIFT));
	63
	64	vsp1_lif_write(lif, VI6_LIF_CTRL,
	65	(obth << VI6_LIF_CTRL_OBTH_SHIFT) \|
	66	(format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) \|
	67	VI6_LIF_CTRL_REQSEL \| VI6_LIF_CTRL_LIF_EN);
	68
69	return 0;
70	}
71
72	/* -----------------------------------------------------------------------------
73	* V4L2 Subdevice Pad Operations
74	*/
75
76	static int lif_enum_mbus_code(struct v4l2_subdev *subdev,
f7234138	77	struct v4l2_subdev_pad_config *cfg,
26e0ca22 LP	78	struct v4l2_subdev_mbus_code_enum *code)
	79	{
	80	static const unsigned int codes[] = {
27ffaeb0 BB	81	MEDIA_BUS_FMT_ARGB8888_1X32,
27ffaeb0 BB	82	MEDIA_BUS_FMT_AYUV8_1X32,
26e0ca22	83	};
3f1ccf16	84	struct vsp1_lif *lif = to_lif(subdev);
26e0ca22 LP	85
	86	if (code->pad == LIF_PAD_SINK) {
	87	if (code->index >= ARRAY_SIZE(codes))
	88	return -EINVAL;
	89
	90	code->code = codes[code->index];
	91	} else {
	92	struct v4l2_mbus_framefmt *format;
	93
	94	/* The LIF can't perform format conversion, the sink format is
	95	* always identical to the source format.
	96	*/
	97	if (code->index)
	98	return -EINVAL;
	99
3f1ccf16 HV	100	format = vsp1_entity_get_pad_format(&lif->entity, cfg,
3f1ccf16 HV	101	LIF_PAD_SINK, code->which);
26e0ca22 LP	102	code->code = format->code;
	103	}
	104
	105	return 0;
	106	}
	107
	108	static int lif_enum_frame_size(struct v4l2_subdev *subdev,
f7234138	109	struct v4l2_subdev_pad_config *cfg,
26e0ca22 LP	110	struct v4l2_subdev_frame_size_enum *fse)
26e0ca22 LP	111	{
5778e749	112	struct vsp1_lif *lif = to_lif(subdev);
26e0ca22 LP	113	struct v4l2_mbus_framefmt *format;
26e0ca22 LP	114
5778e749 HV	115	format = vsp1_entity_get_pad_format(&lif->entity, cfg, LIF_PAD_SINK,
5778e749 HV	116	fse->which);
26e0ca22 LP	117
	118	if (fse->index \|\| fse->code != format->code)
	119	return -EINVAL;
	120
	121	if (fse->pad == LIF_PAD_SINK) {
	122	fse->min_width = LIF_MIN_SIZE;
	123	fse->max_width = LIF_MAX_SIZE;
	124	fse->min_height = LIF_MIN_SIZE;
	125	fse->max_height = LIF_MAX_SIZE;
	126	} else {
	127	fse->min_width = format->width;
	128	fse->max_width = format->width;
	129	fse->min_height = format->height;
	130	fse->max_height = format->height;
	131	}
	132
	133	return 0;
	134	}
	135
f7234138	136	static int lif_get_format(struct v4l2_subdev subdev, struct v4l2_subdev_pad_config cfg,
26e0ca22 LP	137	struct v4l2_subdev_format *fmt)
	138	{
	139	struct vsp1_lif *lif = to_lif(subdev);
	140
f7234138	141	fmt->format = *vsp1_entity_get_pad_format(&lif->entity, cfg, fmt->pad,
26e0ca22 LP	142	fmt->which);
	143
	144	return 0;
	145	}
	146
f7234138	147	static int lif_set_format(struct v4l2_subdev subdev, struct v4l2_subdev_pad_config cfg,
26e0ca22 LP	148	struct v4l2_subdev_format *fmt)
	149	{
	150	struct vsp1_lif *lif = to_lif(subdev);
	151	struct v4l2_mbus_framefmt *format;
	152
	153	/* Default to YUV if the requested format is not supported. */
27ffaeb0 BB	154	if (fmt->format.code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
	155	fmt->format.code != MEDIA_BUS_FMT_AYUV8_1X32)
	156	fmt->format.code = MEDIA_BUS_FMT_AYUV8_1X32;
26e0ca22	157
f7234138	158	format = vsp1_entity_get_pad_format(&lif->entity, cfg, fmt->pad,
26e0ca22 LP	159	fmt->which);
	160
	161	if (fmt->pad == LIF_PAD_SOURCE) {
	162	/* The LIF source format is always identical to its sink
	163	* format.
	164	*/
	165	fmt->format = *format;
	166	return 0;
	167	}
	168
	169	format->code = fmt->format.code;
	170	format->width = clamp_t(unsigned int, fmt->format.width,
	171	LIF_MIN_SIZE, LIF_MAX_SIZE);
	172	format->height = clamp_t(unsigned int, fmt->format.height,
	173	LIF_MIN_SIZE, LIF_MAX_SIZE);
	174	format->field = V4L2_FIELD_NONE;
	175	format->colorspace = V4L2_COLORSPACE_SRGB;
	176
	177	fmt->format = *format;
	178
	179	/* Propagate the format to the source pad. */
f7234138	180	format = vsp1_entity_get_pad_format(&lif->entity, cfg, LIF_PAD_SOURCE,
26e0ca22 LP	181	fmt->which);
	182	*format = fmt->format;
	183
	184	return 0;
	185	}
	186
	187	/* -----------------------------------------------------------------------------
	188	* V4L2 Subdevice Operations
	189	*/
	190
	191	static struct v4l2_subdev_video_ops lif_video_ops = {
	192	.s_stream = lif_s_stream,
	193	};
	194
	195	static struct v4l2_subdev_pad_ops lif_pad_ops = {
	196	.enum_mbus_code = lif_enum_mbus_code,
	197	.enum_frame_size = lif_enum_frame_size,
	198	.get_fmt = lif_get_format,
	199	.set_fmt = lif_set_format,
	200	};
	201
	202	static struct v4l2_subdev_ops lif_ops = {
	203	.video = &lif_video_ops,
	204	.pad = &lif_pad_ops,
	205	};
	206
	207	/* -----------------------------------------------------------------------------
	208	* Initialization and Cleanup
	209	*/
	210
	211	struct vsp1_lif vsp1_lif_create(struct vsp1_device vsp1)
	212	{
	213	struct v4l2_subdev *subdev;
	214	struct vsp1_lif *lif;
	215	int ret;
	216
	217	lif = devm_kzalloc(vsp1->dev, sizeof(*lif), GFP_KERNEL);
	218	if (lif == NULL)
	219	return ERR_PTR(-ENOMEM);
	220
	221	lif->entity.type = VSP1_ENTITY_LIF;
26e0ca22 LP	222
	223	ret = vsp1_entity_init(vsp1, &lif->entity, 2);
	224	if (ret < 0)
	225	return ERR_PTR(ret);
	226
	227	/* Initialize the V4L2 subdev. */
	228	subdev = &lif->entity.subdev;
	229	v4l2_subdev_init(subdev, &lif_ops);
	230
	231	subdev->entity.ops = &vsp1_media_ops;
	232	subdev->internal_ops = &vsp1_subdev_internal_ops;
	233	snprintf(subdev->name, sizeof(subdev->name), "%s lif",
	234	dev_name(vsp1->dev));
	235	v4l2_set_subdevdata(subdev, lif);
	236	subdev->flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;
	237
	238	vsp1_entity_init_formats(subdev, NULL);
	239
	240	return lif;
	241	}