linux/drivers/media/platform/vsp1/vsp1_bru.c
Laurent Pinchart 629bb6d4b3 [media] v4l: vsp1: Add BRU support
The Blend ROP Unit performs blending and ROP operations for up to four
sources.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2014-04-23 10:20:15 -03:00

396 lines
10 KiB
C

/*
* vsp1_bru.c -- R-Car VSP1 Blend ROP Unit
*
* Copyright (C) 2013 Renesas 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_bru.h"
#define BRU_MIN_SIZE 4U
#define BRU_MAX_SIZE 8190U
/* -----------------------------------------------------------------------------
* Device Access
*/
static inline u32 vsp1_bru_read(struct vsp1_bru *bru, u32 reg)
{
return vsp1_read(bru->entity.vsp1, reg);
}
static inline void vsp1_bru_write(struct vsp1_bru *bru, u32 reg, u32 data)
{
vsp1_write(bru->entity.vsp1, reg, data);
}
/* -----------------------------------------------------------------------------
* V4L2 Subdevice Core Operations
*/
static bool bru_is_input_enabled(struct vsp1_bru *bru, unsigned int input)
{
return media_entity_remote_pad(&bru->entity.pads[input]) != NULL;
}
static int bru_s_stream(struct v4l2_subdev *subdev, int enable)
{
struct vsp1_bru *bru = to_bru(subdev);
struct v4l2_mbus_framefmt *format;
unsigned int i;
if (!enable)
return 0;
format = &bru->entity.formats[BRU_PAD_SOURCE];
/* The hardware is extremely flexible but we have no userspace API to
* expose all the parameters, nor is it clear whether we would have use
* cases for all the supported modes. Let's just harcode the parameters
* to sane default values for now.
*/
/* Disable both color data normalization and dithering. */
vsp1_bru_write(bru, VI6_BRU_INCTRL, 0);
/* Set the background position to cover the whole output image and
* set its color to opaque black.
*/
vsp1_bru_write(bru, VI6_BRU_VIRRPF_SIZE,
(format->width << VI6_BRU_VIRRPF_SIZE_HSIZE_SHIFT) |
(format->height << VI6_BRU_VIRRPF_SIZE_VSIZE_SHIFT));
vsp1_bru_write(bru, VI6_BRU_VIRRPF_LOC, 0);
vsp1_bru_write(bru, VI6_BRU_VIRRPF_COL,
0xff << VI6_BRU_VIRRPF_COL_A_SHIFT);
/* Route BRU input 1 as SRC input to the ROP unit and configure the ROP
* unit with a NOP operation to make BRU input 1 available as the
* Blend/ROP unit B SRC input.
*/
vsp1_bru_write(bru, VI6_BRU_ROP, VI6_BRU_ROP_DSTSEL_BRUIN(1) |
VI6_BRU_ROP_CROP(VI6_ROP_NOP) |
VI6_BRU_ROP_AROP(VI6_ROP_NOP));
for (i = 0; i < 4; ++i) {
u32 ctrl = 0;
/* Configure all Blend/ROP units corresponding to an enabled BRU
* input for alpha blending. Blend/ROP units corresponding to
* disabled BRU inputs are used in ROP NOP mode to ignore the
* SRC input.
*/
if (bru_is_input_enabled(bru, i))
ctrl |= VI6_BRU_CTRL_RBC;
else
ctrl |= VI6_BRU_CTRL_CROP(VI6_ROP_NOP)
| VI6_BRU_CTRL_AROP(VI6_ROP_NOP);
/* Select the virtual RPF as the Blend/ROP unit A DST input to
* serve as a background color.
*/
if (i == 0)
ctrl |= VI6_BRU_CTRL_DSTSEL_VRPF;
/* Route BRU inputs 0 to 3 as SRC inputs to Blend/ROP units A to
* D in that order. The Blend/ROP unit B SRC is hardwired to the
* ROP unit output, the corresponding register bits must be set
* to 0.
*/
if (i != 1)
ctrl |= VI6_BRU_CTRL_SRCSEL_BRUIN(i);
vsp1_bru_write(bru, VI6_BRU_CTRL(i), ctrl);
/* Harcode the blending formula to
*
* DSTc = DSTc * (1 - SRCa) + SRCc * SRCa
* DSTa = DSTa * (1 - SRCa) + SRCa
*/
vsp1_bru_write(bru, VI6_BRU_BLD(i),
VI6_BRU_BLD_CCMDX_255_SRC_A |
VI6_BRU_BLD_CCMDY_SRC_A |
VI6_BRU_BLD_ACMDX_255_SRC_A |
VI6_BRU_BLD_ACMDY_COEFY |
(0xff << VI6_BRU_BLD_COEFY_SHIFT));
}
return 0;
}
/* -----------------------------------------------------------------------------
* V4L2 Subdevice Pad Operations
*/
/*
* The BRU can't perform format conversion, all sink and source formats must be
* identical. We pick the format on the first sink pad (pad 0) and propagate it
* to all other pads.
*/
static int bru_enum_mbus_code(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_mbus_code_enum *code)
{
static const unsigned int codes[] = {
V4L2_MBUS_FMT_ARGB8888_1X32,
V4L2_MBUS_FMT_AYUV8_1X32,
};
struct v4l2_mbus_framefmt *format;
if (code->pad == BRU_PAD_SINK(0)) {
if (code->index >= ARRAY_SIZE(codes))
return -EINVAL;
code->code = codes[code->index];
} else {
if (code->index)
return -EINVAL;
format = v4l2_subdev_get_try_format(fh, BRU_PAD_SINK(0));
code->code = format->code;
}
return 0;
}
static int bru_enum_frame_size(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_frame_size_enum *fse)
{
if (fse->index)
return -EINVAL;
if (fse->code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
fse->code != V4L2_MBUS_FMT_AYUV8_1X32)
return -EINVAL;
fse->min_width = BRU_MIN_SIZE;
fse->max_width = BRU_MAX_SIZE;
fse->min_height = BRU_MIN_SIZE;
fse->max_height = BRU_MAX_SIZE;
return 0;
}
static struct v4l2_rect *bru_get_compose(struct vsp1_bru *bru,
struct v4l2_subdev_fh *fh,
unsigned int pad, u32 which)
{
switch (which) {
case V4L2_SUBDEV_FORMAT_TRY:
return v4l2_subdev_get_try_crop(fh, pad);
case V4L2_SUBDEV_FORMAT_ACTIVE:
return &bru->compose[pad];
default:
return NULL;
}
}
static int bru_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
struct v4l2_subdev_format *fmt)
{
struct vsp1_bru *bru = to_bru(subdev);
fmt->format = *vsp1_entity_get_pad_format(&bru->entity, fh, fmt->pad,
fmt->which);
return 0;
}
static void bru_try_format(struct vsp1_bru *bru, struct v4l2_subdev_fh *fh,
unsigned int pad, struct v4l2_mbus_framefmt *fmt,
enum v4l2_subdev_format_whence which)
{
struct v4l2_mbus_framefmt *format;
switch (pad) {
case BRU_PAD_SINK(0):
/* Default to YUV if the requested format is not supported. */
if (fmt->code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
fmt->code != V4L2_MBUS_FMT_AYUV8_1X32)
fmt->code = V4L2_MBUS_FMT_AYUV8_1X32;
break;
default:
/* The BRU can't perform format conversion. */
format = vsp1_entity_get_pad_format(&bru->entity, fh,
BRU_PAD_SINK(0), which);
fmt->code = format->code;
break;
}
fmt->width = clamp(fmt->width, BRU_MIN_SIZE, BRU_MAX_SIZE);
fmt->height = clamp(fmt->height, BRU_MIN_SIZE, BRU_MAX_SIZE);
fmt->field = V4L2_FIELD_NONE;
fmt->colorspace = V4L2_COLORSPACE_SRGB;
}
static int bru_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
struct v4l2_subdev_format *fmt)
{
struct vsp1_bru *bru = to_bru(subdev);
struct v4l2_mbus_framefmt *format;
bru_try_format(bru, fh, fmt->pad, &fmt->format, fmt->which);
format = vsp1_entity_get_pad_format(&bru->entity, fh, fmt->pad,
fmt->which);
*format = fmt->format;
/* Reset the compose rectangle */
if (fmt->pad != BRU_PAD_SOURCE) {
struct v4l2_rect *compose;
compose = bru_get_compose(bru, fh, fmt->pad, fmt->which);
compose->left = 0;
compose->top = 0;
compose->width = format->width;
compose->height = format->height;
}
/* Propagate the format code to all pads */
if (fmt->pad == BRU_PAD_SINK(0)) {
unsigned int i;
for (i = 0; i <= BRU_PAD_SOURCE; ++i) {
format = vsp1_entity_get_pad_format(&bru->entity, fh,
i, fmt->which);
format->code = fmt->format.code;
}
}
return 0;
}
static int bru_get_selection(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_selection *sel)
{
struct vsp1_bru *bru = to_bru(subdev);
if (sel->pad == BRU_PAD_SOURCE)
return -EINVAL;
switch (sel->target) {
case V4L2_SEL_TGT_COMPOSE_BOUNDS:
sel->r.left = 0;
sel->r.top = 0;
sel->r.width = BRU_MAX_SIZE;
sel->r.height = BRU_MAX_SIZE;
return 0;
case V4L2_SEL_TGT_COMPOSE:
sel->r = *bru_get_compose(bru, fh, sel->pad, sel->which);
return 0;
default:
return -EINVAL;
}
}
static int bru_set_selection(struct v4l2_subdev *subdev,
struct v4l2_subdev_fh *fh,
struct v4l2_subdev_selection *sel)
{
struct vsp1_bru *bru = to_bru(subdev);
struct v4l2_mbus_framefmt *format;
struct v4l2_rect *compose;
if (sel->pad == BRU_PAD_SOURCE)
return -EINVAL;
if (sel->target != V4L2_SEL_TGT_COMPOSE)
return -EINVAL;
/* The compose rectangle top left corner must be inside the output
* frame.
*/
format = vsp1_entity_get_pad_format(&bru->entity, fh, BRU_PAD_SOURCE,
sel->which);
sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1);
sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1);
/* Scaling isn't supported, the compose rectangle size must be identical
* to the sink format size.
*/
format = vsp1_entity_get_pad_format(&bru->entity, fh, sel->pad,
sel->which);
sel->r.width = format->width;
sel->r.height = format->height;
compose = bru_get_compose(bru, fh, sel->pad, sel->which);
*compose = sel->r;
return 0;
}
/* -----------------------------------------------------------------------------
* V4L2 Subdevice Operations
*/
static struct v4l2_subdev_video_ops bru_video_ops = {
.s_stream = bru_s_stream,
};
static struct v4l2_subdev_pad_ops bru_pad_ops = {
.enum_mbus_code = bru_enum_mbus_code,
.enum_frame_size = bru_enum_frame_size,
.get_fmt = bru_get_format,
.set_fmt = bru_set_format,
.get_selection = bru_get_selection,
.set_selection = bru_set_selection,
};
static struct v4l2_subdev_ops bru_ops = {
.video = &bru_video_ops,
.pad = &bru_pad_ops,
};
/* -----------------------------------------------------------------------------
* Initialization and Cleanup
*/
struct vsp1_bru *vsp1_bru_create(struct vsp1_device *vsp1)
{
struct v4l2_subdev *subdev;
struct vsp1_bru *bru;
int ret;
bru = devm_kzalloc(vsp1->dev, sizeof(*bru), GFP_KERNEL);
if (bru == NULL)
return ERR_PTR(-ENOMEM);
bru->entity.type = VSP1_ENTITY_BRU;
ret = vsp1_entity_init(vsp1, &bru->entity, 5);
if (ret < 0)
return ERR_PTR(ret);
/* Initialize the V4L2 subdev. */
subdev = &bru->entity.subdev;
v4l2_subdev_init(subdev, &bru_ops);
subdev->entity.ops = &vsp1_media_ops;
subdev->internal_ops = &vsp1_subdev_internal_ops;
snprintf(subdev->name, sizeof(subdev->name), "%s bru",
dev_name(vsp1->dev));
v4l2_set_subdevdata(subdev, bru);
subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
vsp1_entity_init_formats(subdev, NULL);
return bru;
}