// SPDX-License-Identifier: MIT
/*
 * Copyright © 2026 Intel Corporation
 */

#include <linux/minmax.h>

#include <drm/drm_print.h>

#include "intel_de.h"
#include "intel_display_core.h"
#include "intel_mchbar.h"

static bool has_mchbar_mirror(struct intel_display *display)
{
        return DISPLAY_VER(display) < 14;
}

static u32 mchbar_mirror_base(struct intel_display *display)
{
        if (DISPLAY_VER(display) >= 6)
                return MCHBAR_MIRROR_BASE_SNB;
        else
                return MCHBAR_MIRROR_BASE;
}

static u32 mchbar_mirror_end(struct intel_display *display)
{
        if (DISPLAY_VER(display) >= 12 && !display->platform.rocketlake)
                return MCHBAR_MIRROR_END_TGL;
        else if (DISPLAY_VER(display) >= 11)
                return MCHBAR_MIRROR_END_ICL_RKL;
        else if (DISPLAY_VER(display) >= 6)
                return MCHBAR_MIRROR_END_SNB;
        else
                return MCHBAR_MIRROR_END;
}

static u32 mchbar_mirror_len(struct intel_display *display)
{
        return mchbar_mirror_end(display) - mchbar_mirror_base(display) + 1;
}

static bool is_mchbar_reg(struct intel_display *display, intel_reg_t reg)
{
        return has_mchbar_mirror(display) &&
                in_range32(intel_reg_offset(reg),
                           mchbar_mirror_base(display),
                           mchbar_mirror_len(display));
}

static void assert_is_mchbar_reg(struct intel_display *display, intel_reg_t reg)
{
        drm_WARN(display->drm, !is_mchbar_reg(display, reg),
                 "Reading non-MCHBAR register 0x%x\n",
                 intel_reg_offset(reg));
}

u16 intel_mchbar_read16(struct intel_display *display, intel_reg_t reg)
{
        assert_is_mchbar_reg(display, reg);

        return intel_de_read16(display, reg);
}

u32 intel_mchbar_read(struct intel_display *display, intel_reg_t reg)
{
        assert_is_mchbar_reg(display, reg);

        return intel_de_read(display, reg);
}

u64 intel_mchbar_read64_2x32(struct intel_display *display, intel_reg_t reg)
{
        assert_is_mchbar_reg(display, reg);

        return intel_de_read64_2x32(display, reg);
}