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/*
* 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_fh *fh,
struct v4l2_subdev_mbus_code_enum *code)
{
static const unsigned int codes[] = {
MEDIA_BUS_FMT_ARGB8888_1X32,
MEDIA_BUS_FMT_AYUV8_1X32,
};
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 = v4l2_subdev_get_try_format(fh, LIF_PAD_SINK);
code->code = format->code;
}
return 0;
}
static int lif_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_frame_size_enum *fse)
{
struct v4l2_mbus_framefmt *format;
format = v4l2_subdev_get_try_format(fh, LIF_PAD_SINK);
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_fh *fh,
struct v4l2_subdev_format *fmt)
{
struct vsp1_lif *lif = to_lif(subdev);
fmt->format = *vsp1_entity_get_pad_format(&lif->entity, fh, fmt->pad,
fmt->which);
return 0;
}
static int lif_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
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, fh, 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, fh, 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;
}
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