// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016 BayLibre, SAS
 * Author: Neil Armstrong <narmstrong@baylibre.com>
 * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
 * Copyright (C) 2014 Endless Mobile
 */

#include <linux/export.h>

#include "meson_drv.h"
#include "meson_registers.h"
#include "meson_vpp.h"

/**
 * DOC: Video Post Processing
 *
 * VPP Handles all the Post Processing after the Scanout from the VIU
 * We handle the following post processings :
 *
 * - Postblend, Blends the OSD1 only
 *      We exclude OSD2, VS1, VS1 and Preblend output
 * - Vertical OSD Scaler for OSD1 only, we disable vertical scaler and
 *      use it only for interlace scanout
 * - Intermediate FIFO with default Amlogic values
 *
 * What is missing :
 *
 * - Preblend for video overlay pre-scaling
 * - OSD2 support for cursor framebuffer
 * - Video pre-scaling before postblend
 * - Full Vertical/Horizontal OSD scaling to support TV overscan
 * - HDR conversion
 */

void meson_vpp_setup_mux(struct meson_drm *priv, unsigned int mux)
{
        writel(mux, priv->io_base + _REG(VPU_VIU_VENC_MUX_CTRL));
}

static unsigned int vpp_filter_coefs_4point_bspline[] = {
        0x15561500, 0x14561600, 0x13561700, 0x12561800,
        0x11551a00, 0x11541b00, 0x10541c00, 0x0f541d00,
        0x0f531e00, 0x0e531f00, 0x0d522100, 0x0c522200,
        0x0b522300, 0x0b512400, 0x0a502600, 0x0a4f2700,
        0x094e2900, 0x084e2a00, 0x084d2b00, 0x074c2c01,
        0x074b2d01, 0x064a2f01, 0x06493001, 0x05483201,
        0x05473301, 0x05463401, 0x04453601, 0x04433702,
        0x04423802, 0x03413a02, 0x03403b02, 0x033f3c02,
        0x033d3d03
};

static void meson_vpp_write_scaling_filter_coefs(struct meson_drm *priv,
                                                 const unsigned int *coefs,
                                                 bool is_horizontal)
{
        int i;

        writel_relaxed(is_horizontal ? VPP_SCALE_HORIZONTAL_COEF : 0,
                        priv->io_base + _REG(VPP_OSD_SCALE_COEF_IDX));
        for (i = 0; i < 33; i++)
                writel_relaxed(coefs[i],
                                priv->io_base + _REG(VPP_OSD_SCALE_COEF));
}

static const uint32_t vpp_filter_coefs_bicubic[] = {
        0x00800000, 0x007f0100, 0xff7f0200, 0xfe7f0300,
        0xfd7e0500, 0xfc7e0600, 0xfb7d0800, 0xfb7c0900,
        0xfa7b0b00, 0xfa7a0dff, 0xf9790fff, 0xf97711ff,
        0xf87613ff, 0xf87416fe, 0xf87218fe, 0xf8701afe,
        0xf76f1dfd, 0xf76d1ffd, 0xf76b21fd, 0xf76824fd,
        0xf76627fc, 0xf76429fc, 0xf7612cfc, 0xf75f2ffb,
        0xf75d31fb, 0xf75a34fb, 0xf75837fa, 0xf7553afa,
        0xf8523cfa, 0xf8503ff9, 0xf84d42f9, 0xf84a45f9,
        0xf84848f8
};

static void meson_vpp_write_vd_scaling_filter_coefs(struct meson_drm *priv,
                                                    const unsigned int *coefs,
                                                    bool is_horizontal)
{
        int i;

        writel_relaxed(is_horizontal ? VPP_SCALE_HORIZONTAL_COEF : 0,
                        priv->io_base + _REG(VPP_SCALE_COEF_IDX));
        for (i = 0; i < 33; i++)
                writel_relaxed(coefs[i],
                                priv->io_base + _REG(VPP_SCALE_COEF));
}

void meson_vpp_init(struct meson_drm *priv)
{
        /* set dummy data default YUV black */
        if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXL))
                writel_relaxed(0x108080, priv->io_base + _REG(VPP_DUMMY_DATA1));
        else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_GXM)) {
                writel_bits_relaxed(0xff << 16, 0xff << 16,
                                    priv->io_base + _REG(VIU_MISC_CTRL1));
                writel_relaxed(VPP_PPS_DUMMY_DATA_MODE,
                               priv->io_base + _REG(VPP_DOLBY_CTRL));
                writel_relaxed(0x1020080,
                                priv->io_base + _REG(VPP_DUMMY_DATA1));
                writel_relaxed(0x42020,
                                priv->io_base + _REG(VPP_DUMMY_DATA));
        } else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A))
                writel_relaxed(0xf, priv->io_base + _REG(DOLBY_PATH_CTRL));

        /* Initialize vpu fifo control registers */
        if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A))
                writel_relaxed(VPP_OFIFO_SIZE_DEFAULT,
                               priv->io_base + _REG(VPP_OFIFO_SIZE));
        else
                writel_bits_relaxed(VPP_OFIFO_SIZE_MASK, 0x77f,
                                    priv->io_base + _REG(VPP_OFIFO_SIZE));
        writel_relaxed(VPP_POSTBLEND_HOLD_LINES(4) | VPP_PREBLEND_HOLD_LINES(4),
                       priv->io_base + _REG(VPP_HOLD_LINES));

        if (!meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) {
                /* Turn off preblend */
                writel_bits_relaxed(VPP_PREBLEND_ENABLE, 0,
                                    priv->io_base + _REG(VPP_MISC));

                /* Turn off POSTBLEND */
                writel_bits_relaxed(VPP_POSTBLEND_ENABLE, 0,
                                    priv->io_base + _REG(VPP_MISC));

                /* Force all planes off */
                writel_bits_relaxed(VPP_OSD1_POSTBLEND | VPP_OSD2_POSTBLEND |
                                    VPP_VD1_POSTBLEND | VPP_VD2_POSTBLEND |
                                    VPP_VD1_PREBLEND | VPP_VD2_PREBLEND, 0,
                                    priv->io_base + _REG(VPP_MISC));

                /* Setup default VD settings */
                writel_relaxed(4096,
                                priv->io_base + _REG(VPP_PREBLEND_VD1_H_START_END));
                writel_relaxed(4096,
                                priv->io_base + _REG(VPP_BLEND_VD2_H_START_END));
        }

        /* Disable Scalers */
        writel_relaxed(0, priv->io_base + _REG(VPP_OSD_SC_CTRL0));
        writel_relaxed(0, priv->io_base + _REG(VPP_OSD_VSC_CTRL0));
        writel_relaxed(0, priv->io_base + _REG(VPP_OSD_HSC_CTRL0));

        /* Set horizontal/vertical bank length and enable video scale out */
        writel_relaxed(VPP_VSC_BANK_LENGTH(4) | VPP_HSC_BANK_LENGTH(4) |
                       VPP_SC_VD_EN_ENABLE,
                       priv->io_base + _REG(VPP_SC_MISC));

        /* Enable minus black level for vadj1 */
        writel_relaxed(VPP_MINUS_BLACK_LVL_VADJ1_ENABLE,
                       priv->io_base + _REG(VPP_VADJ_CTRL));

        /* Write in the proper filter coefficients. */
        meson_vpp_write_scaling_filter_coefs(priv,
                                vpp_filter_coefs_4point_bspline, false);
        meson_vpp_write_scaling_filter_coefs(priv,
                                vpp_filter_coefs_4point_bspline, true);

        /* Write the VD proper filter coefficients. */
        meson_vpp_write_vd_scaling_filter_coefs(priv, vpp_filter_coefs_bicubic,
                                                false);
        meson_vpp_write_vd_scaling_filter_coefs(priv, vpp_filter_coefs_bicubic,
                                                true);
}