// SPDX-License-Identifier: GPL-2.0+
/*
 * vsp1_lif.c  --  R-Car VSP1 LCD Controller Interface
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <linux/device.h>
#include <linux/gfp.h>

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_lif.h"

#define LIF_MIN_SIZE                            2U
#define LIF_MAX_SIZE                            8190U

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

static inline void vsp1_lif_write(struct vsp1_lif *lif,
                                  struct vsp1_dl_body *dlb, u32 reg, u32 data)
{
        vsp1_dl_body_write(dlb, reg + lif->entity.index * VI6_LIF_OFFSET,
                               data);
}

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

static const unsigned int lif_codes[] = {
        MEDIA_BUS_FMT_ARGB8888_1X32,
        MEDIA_BUS_FMT_AYUV8_1X32,
};

static int lif_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, lif_codes,
                                          ARRAY_SIZE(lif_codes));
}

static int lif_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,
                                           LIF_MIN_SIZE,
                                           LIF_MIN_SIZE, LIF_MAX_SIZE,
                                           LIF_MAX_SIZE);
}

static int lif_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, lif_codes,
                                          ARRAY_SIZE(lif_codes),
                                          LIF_MIN_SIZE, LIF_MIN_SIZE,
                                          LIF_MAX_SIZE, LIF_MAX_SIZE);
}

static const struct v4l2_subdev_pad_ops lif_pad_ops = {
        .enum_mbus_code = lif_enum_mbus_code,
        .enum_frame_size = lif_enum_frame_size,
        .get_fmt = vsp1_subdev_get_pad_format,
        .set_fmt = lif_set_format,
};

static const struct v4l2_subdev_ops lif_ops = {
        .pad    = &lif_pad_ops,
};

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

static void lif_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)
{
        const struct v4l2_mbus_framefmt *format;
        struct vsp1_lif *lif = to_lif(&entity->subdev);
        unsigned int hbth;
        unsigned int obth;
        unsigned int lbth;

        format = v4l2_subdev_state_get_format(state, LIF_PAD_SOURCE);

        switch (entity->vsp1->version & VI6_IP_VERSION_MODEL_MASK) {
        case VI6_IP_VERSION_MODEL_VSPD_GEN2:
        case VI6_IP_VERSION_MODEL_VSPD_V2H:
                hbth = 1536;
                obth = min(128U, (format->width + 1) / 2 * format->height - 4);
                lbth = 1520;
                break;

        case VI6_IP_VERSION_MODEL_VSPDL_GEN3:
        case VI6_IP_VERSION_MODEL_VSPD_V3:
        case VI6_IP_VERSION_MODEL_VSPD_RZG2L:
                hbth = 0;
                obth = 1500;
                lbth = 0;
                break;

        case VI6_IP_VERSION_MODEL_VSPD_GEN3:
        case VI6_IP_VERSION_MODEL_VSPD_GEN4:
        default:
                hbth = 0;
                obth = 3000;
                lbth = 0;
                break;
        }

        vsp1_lif_write(lif, dlb, VI6_LIF_CSBTH,
                        (hbth << VI6_LIF_CSBTH_HBTH_SHIFT) |
                        (lbth << VI6_LIF_CSBTH_LBTH_SHIFT));

        vsp1_lif_write(lif, dlb, 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);

        /*
         * On R-Car V3M and RZ/G2L the LIF0 buffer attribute register has to be
         * set to a non-default value to guarantee proper operation (otherwise
         * artifacts may appear on the output). The value required by the
         * manual is not explained but is likely a buffer size or threshold.
         */
        if (vsp1_feature(entity->vsp1, VSP1_HAS_NON_ZERO_LBA))
                vsp1_lif_write(lif, dlb, VI6_LIF_LBA,
                               VI6_LIF_LBA_LBA0 |
                               (1536 << VI6_LIF_LBA_LBA1_SHIFT));
}

static const struct vsp1_entity_operations lif_entity_ops = {
        .configure_stream = lif_configure_stream,
};

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

struct vsp1_lif *vsp1_lif_create(struct vsp1_device *vsp1, unsigned int index)
{
        struct vsp1_lif *lif;
        int ret;

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

        lif->entity.ops = &lif_entity_ops;
        lif->entity.type = VSP1_ENTITY_LIF;
        lif->entity.index = index;

        /*
         * The LIF 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, &lif->entity, "lif", 2, &lif_ops,
                               MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER);
        if (ret < 0)
                return ERR_PTR(ret);

        return lif;
}