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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <bootstate.h>
#include <intelblocks/cfg.h>
#include <intelblocks/fast_spi.h>
#include <intelblocks/pcr.h>
#include <intelpch/lockdown.h>
#include <soc/pci_devs.h>
#include <soc/pcr_ids.h>
#include <soc/soc_chip.h>
#define PCR_DMI_GCS 0x274C
#define PCR_DMI_GCS_BILD (1 << 0)
/*
* This function will get lockdown config specific to soc.
*
* Return values:
* 0 = CHIPSET_LOCKDOWN_FSP = use FSP's lockdown functionality to lockdown IPs
* 1 = CHIPSET_LOCKDOWN_COREBOOT = Use coreboot to lockdown IPs
*/
int get_lockdown_config(void)
{
const struct soc_intel_common_config *common_config;
common_config = chip_get_common_soc_structure();
return common_config->chipset_lockdown;
}
static void dmi_lockdown_cfg(void)
{
/*
* GCS reg of DMI
*
* When set, prevents GCS.BBS from being changed
* GCS.BBS: (Boot BIOS Strap) This field determines the destination
* of accesses to the BIOS memory range.
* Bits Description
* "0b": SPI
* "1b": LPC/eSPI
*/
pcr_or8(PID_DMI, PCR_DMI_GCS, PCR_DMI_GCS_BILD);
}
static void fast_spi_lockdown_cfg(int chipset_lockdown)
{
if (!CONFIG(SOC_INTEL_COMMON_BLOCK_FAST_SPI))
return;
/* Set FAST_SPI opcode menu */
fast_spi_set_opcode_menu();
/* Discrete Lock Flash PR registers */
fast_spi_pr_dlock();
/* Lock FAST_SPIBAR */
fast_spi_lock_bar();
/* Set BIOS Interface Lock, BIOS Lock */
if (chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT) {
/* BIOS Interface Lock */
fast_spi_set_bios_interface_lock_down();
/* BIOS Lock */
fast_spi_set_lock_enable();
}
}
/*
* platform_lockdown_config has 2 major part.
* 1. Common SoC lockdown configuration.
* 2. SoC specific lockdown configuration as per Silicon
* guideline.
*/
static void platform_lockdown_config(void *unused)
{
int chipset_lockdown;
chipset_lockdown = get_lockdown_config();
/* SPI lock down configuration */
fast_spi_lockdown_cfg(chipset_lockdown);
/* DMI lock down configuration */
dmi_lockdown_cfg();
/* SoC lock down configuration */
soc_lockdown_config(chipset_lockdown);
}
BOOT_STATE_INIT_ENTRY(BS_DEV_RESOURCES, BS_ON_EXIT, platform_lockdown_config,
NULL);
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