// SPDX-License-Identifier: GPL-2.0+
/*
 * vsp1_iif.c  --  R-Car VSP1 IIF (ISP Interface)
 *
 * Copyright (C) 2025 Ideas On Board Oy
 * Copyright (C) 2025 Renesas Corporation
 */

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_iif.h"

#define IIF_MIN_WIDTH                           128U
#define IIF_MIN_HEIGHT                          32U
#define IIF_MAX_WIDTH                           5120U
#define IIF_MAX_HEIGHT                          4096U

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

static inline void vsp1_iif_write(struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
        vsp1_dl_body_write(dlb, reg, data);
}

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

static const unsigned int iif_codes[] = {
        MEDIA_BUS_FMT_Y8_1X8,
        MEDIA_BUS_FMT_Y10_1X10,
        MEDIA_BUS_FMT_Y12_1X12,
        MEDIA_BUS_FMT_Y16_1X16,
        MEDIA_BUS_FMT_METADATA_FIXED
};

static int iif_enum_mbus_code(struct v4l2_subdev *subdev,
                              struct v4l2_subdev_state *sd_state,
                              struct v4l2_subdev_mbus_code_enum *code)
{
        return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, iif_codes,
                                          ARRAY_SIZE(iif_codes));
}

static int iif_enum_frame_size(struct v4l2_subdev *subdev,
                               struct v4l2_subdev_state *sd_state,
                               struct v4l2_subdev_frame_size_enum *fse)
{
        return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
                                           IIF_MIN_WIDTH, IIF_MIN_HEIGHT,
                                           IIF_MAX_WIDTH, IIF_MAX_HEIGHT);
}

static int iif_set_format(struct v4l2_subdev *subdev,
                          struct v4l2_subdev_state *sd_state,
                          struct v4l2_subdev_format *fmt)
{
        return vsp1_subdev_set_pad_format(subdev, sd_state, fmt, iif_codes,
                                          ARRAY_SIZE(iif_codes),
                                          IIF_MIN_WIDTH, IIF_MIN_HEIGHT,
                                          IIF_MAX_WIDTH, IIF_MAX_HEIGHT);
}

static const struct v4l2_subdev_pad_ops iif_pad_ops = {
        .enum_mbus_code = iif_enum_mbus_code,
        .enum_frame_size = iif_enum_frame_size,
        .get_fmt = vsp1_subdev_get_pad_format,
        .set_fmt = iif_set_format,
};

static const struct v4l2_subdev_ops iif_ops = {
        .pad    = &iif_pad_ops,
};

/* -----------------------------------------------------------------------------
 * VSP1 Entity Operations
 */

static void iif_configure_stream(struct vsp1_entity *entity,
                                 struct v4l2_subdev_state *state,
                                 struct vsp1_pipeline *pipe,
                                 struct vsp1_dl_list *dl,
                                 struct vsp1_dl_body *dlb)
{
        vsp1_iif_write(dlb, VI6_IIF_CTRL, VI6_IIF_CTRL_CTRL);
}

static const struct vsp1_entity_operations iif_entity_ops = {
        .configure_stream = iif_configure_stream,
};

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

struct vsp1_iif *vsp1_iif_create(struct vsp1_device *vsp1)
{
        struct vsp1_iif *iif;
        int ret;

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

        iif->entity.ops = &iif_entity_ops;
        iif->entity.type = VSP1_ENTITY_IIF;

        /*
         * The IIF is never exposed to userspace, but media entity registration
         * requires a function to be set. Use PROC_VIDEO_PIXEL_FORMATTER just to
         * avoid triggering a WARN_ON(), the value won't be seen anywhere.
         */
        ret = vsp1_entity_init(vsp1, &iif->entity, "iif", 3, &iif_ops,
                               MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
        if (ret < 0)
                return ERR_PTR(ret);

        return iif;
}