// SPDX-License-Identifier: GPL-2.0+
/*
 * shmob_drm_kms.c  --  SH Mobile DRM Mode Setting
 *
 * Copyright (C) 2012 Renesas Electronics Corporation
 *
 * Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_probe_helper.h>

#include "shmob_drm_crtc.h"
#include "shmob_drm_drv.h"
#include "shmob_drm_kms.h"
#include "shmob_drm_plane.h"
#include "shmob_drm_regs.h"

/* -----------------------------------------------------------------------------
 * Format helpers
 */

static const struct shmob_drm_format_info shmob_drm_format_infos[] = {
        {
                .fourcc = DRM_FORMAT_RGB565,
                .bpp = 16,
                .lddfr = LDDFR_PKF_RGB16,
                .ldddsr = LDDDSR_LS | LDDDSR_WS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_RY | LDBBSIFR_RPKF_RGB16,
        }, {
                .fourcc = DRM_FORMAT_RGB888,
                .bpp = 24,
                .lddfr = LDDFR_PKF_RGB24,
                .ldddsr = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_SWPB | LDBBSIFR_RY | LDBBSIFR_RPKF_RGB24,
        }, {
                .fourcc = DRM_FORMAT_ARGB8888,
                .bpp = 32,
                .lddfr = LDDFR_PKF_ARGB32,
                .ldddsr = LDDDSR_LS,
                .ldbbsifr = LDBBSIFR_AL_PK | LDBBSIFR_SWPL | LDBBSIFR_RY |
                            LDBBSIFR_RPKF_ARGB32,
        }, {
                .fourcc = DRM_FORMAT_XRGB8888,
                .bpp = 32,
                .lddfr = LDDFR_PKF_ARGB32,
                .ldddsr = LDDDSR_LS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_RY |
                            LDBBSIFR_RPKF_ARGB32,
        }, {
                .fourcc = DRM_FORMAT_NV12,
                .bpp = 12,
                .lddfr = LDDFR_CC | LDDFR_YF_420,
                .ldddsr = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_SWPB | LDBBSIFR_CHRR_420,
        }, {
                .fourcc = DRM_FORMAT_NV21,
                .bpp = 12,
                .lddfr = LDDFR_CC | LDDFR_YF_420,
                .ldddsr = LDDDSR_LS | LDDDSR_WS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_CHRR_420,
        }, {
                .fourcc = DRM_FORMAT_NV16,
                .bpp = 16,
                .lddfr = LDDFR_CC | LDDFR_YF_422,
                .ldddsr = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_SWPB | LDBBSIFR_CHRR_422,
        }, {
                .fourcc = DRM_FORMAT_NV61,
                .bpp = 16,
                .lddfr = LDDFR_CC | LDDFR_YF_422,
                .ldddsr = LDDDSR_LS | LDDDSR_WS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_CHRR_422,
        }, {
                .fourcc = DRM_FORMAT_NV24,
                .bpp = 24,
                .lddfr = LDDFR_CC | LDDFR_YF_444,
                .ldddsr = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_SWPB | LDBBSIFR_CHRR_444,
        }, {
                .fourcc = DRM_FORMAT_NV42,
                .bpp = 24,
                .lddfr = LDDFR_CC | LDDFR_YF_444,
                .ldddsr = LDDDSR_LS | LDDDSR_WS,
                .ldbbsifr = LDBBSIFR_AL_1 | LDBBSIFR_SWPL | LDBBSIFR_SWPW |
                            LDBBSIFR_CHRR_444,
        },
};

const struct shmob_drm_format_info *shmob_drm_format_info(u32 fourcc)
{
        unsigned int i;

        for (i = 0; i < ARRAY_SIZE(shmob_drm_format_infos); ++i) {
                if (shmob_drm_format_infos[i].fourcc == fourcc)
                        return &shmob_drm_format_infos[i];
        }

        return NULL;
}

/* -----------------------------------------------------------------------------
 * Frame buffer
 */

static struct drm_framebuffer *
shmob_drm_fb_create(struct drm_device *dev, struct drm_file *file_priv,
                    const struct drm_format_info *info,
                    const struct drm_mode_fb_cmd2 *mode_cmd)
{
        const struct shmob_drm_format_info *format;

        format = shmob_drm_format_info(mode_cmd->pixel_format);
        if (format == NULL) {
                dev_dbg(dev->dev, "unsupported pixel format %p4cc\n",
                        &mode_cmd->pixel_format);
                return ERR_PTR(-EINVAL);
        }

        if (mode_cmd->pitches[0] & 7 || mode_cmd->pitches[0] >= 65536) {
                dev_dbg(dev->dev, "invalid pitch value %u\n",
                        mode_cmd->pitches[0]);
                return ERR_PTR(-EINVAL);
        }

        if (shmob_drm_format_is_yuv(format)) {
                unsigned int chroma_cpp = format->bpp == 24 ? 2 : 1;

                if (mode_cmd->pitches[1] != mode_cmd->pitches[0] * chroma_cpp) {
                        dev_dbg(dev->dev,
                                "luma and chroma pitches do not match\n");
                        return ERR_PTR(-EINVAL);
                }
        }

        return drm_gem_fb_create(dev, file_priv, info, mode_cmd);
}

static const struct drm_mode_config_funcs shmob_drm_mode_config_funcs = {
        .fb_create = shmob_drm_fb_create,
        .atomic_check = drm_atomic_helper_check,
        .atomic_commit = drm_atomic_helper_commit,
};

int shmob_drm_modeset_init(struct shmob_drm_device *sdev)
{
        struct drm_device *dev = &sdev->ddev;
        int ret;

        ret = drmm_mode_config_init(dev);
        if (ret)
                return ret;

        ret = shmob_drm_crtc_create(sdev);
        if (ret < 0)
                return ret;

        ret = shmob_drm_encoder_create(sdev);
        if (ret < 0)
                return ret;

        ret = shmob_drm_connector_create(sdev, &sdev->encoder);
        if (ret < 0)
                return ret;

        drm_mode_config_reset(dev);

        drm_kms_helper_poll_init(dev);

        sdev->ddev.mode_config.min_width = 0;
        sdev->ddev.mode_config.min_height = 0;
        sdev->ddev.mode_config.max_width = 4095;
        sdev->ddev.mode_config.max_height = 4095;
        sdev->ddev.mode_config.funcs = &shmob_drm_mode_config_funcs;

        return 0;
}