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// 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);
}
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