diff options
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_bru.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_bru.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_bru.c b/drivers/media/platform/vsp1/vsp1_bru.c new file mode 100644 index 000000000000..f80695480060 --- /dev/null +++ b/drivers/media/platform/vsp1/vsp1_bru.c @@ -0,0 +1,395 @@ +/* + * 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; +} |