diff options
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_lif.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_lif.c | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_lif.c b/drivers/media/platform/vsp1/vsp1_lif.c new file mode 100644 index 000000000000..74a32e69ef10 --- /dev/null +++ b/drivers/media/platform/vsp1/vsp1_lif.c @@ -0,0 +1,238 @@ +/* + * vsp1_lif.c -- R-Car VSP1 LCD Controller Interface + * + * 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_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[] = { + V4L2_MBUS_FMT_ARGB8888_1X32, + V4L2_MBUS_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 != V4L2_MBUS_FMT_ARGB8888_1X32 && + fmt->format.code != V4L2_MBUS_FMT_AYUV8_1X32) + fmt->format.code = V4L2_MBUS_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; + lif->entity.id = VI6_DPR_NODE_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; +} |