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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2017 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <arch/io.h>
#include <bootstate.h>
#include <chip.h>
#include <intelblocks/fast_spi.h>
#include <intelblocks/pcr.h>
#include <soc/lpc.h>
#include <soc/pci_devs.h>
#include <soc/pcr_ids.h>
#include <soc/pm.h>
#include <string.h>
#define PCR_DMI_GCS 0x274C
#define PCR_DMI_GCS_BILD (1 << 0)
static void lpc_lockdown_config(const struct soc_intel_skylake_config *config)
{
struct device *dev;
uint8_t reg_mask = 0;
dev = PCH_DEV_LPC;
/* Set Bios Interface Lock, Bios Lock */
if (config->chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT)
reg_mask |= LPC_BC_BILD | LPC_BC_LE;
pci_or_config8(dev, BIOS_CNTL, reg_mask);
/* Ensure an additional read back after performing lock down */
pci_read_config8(dev, BIOS_CNTL);
}
static void pmc_lockdown_config(void)
{
uint8_t *pmcbase;
u32 pmsyncreg;
/* PMSYNC */
pmcbase = pmc_mmio_regs();
pmsyncreg = read32(pmcbase + PMSYNC_TPR_CFG);
pmsyncreg |= PMSYNC_LOCK;
write32(pmcbase + PMSYNC_TPR_CFG, pmsyncreg);
}
static void dmi_lockdown_config(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 spi_lockdown_config(const struct soc_intel_skylake_config *config)
{
/* 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 (config->chipset_lockdown == CHIPSET_LOCKDOWN_COREBOOT) {
/* Bios Interface Lock */
fast_spi_set_bios_interface_lock_down();
/* Bios Lock */
fast_spi_set_lock_enable();
}
}
static void platform_lockdown_config(void *unused)
{
struct soc_intel_skylake_config *config;
struct device *dev;
dev = PCH_DEV_SPI;
/* Check if device is valid, else return */
if (dev == NULL || dev->chip_info == NULL)
return;
config = dev->chip_info;
/* LPC lock down configuration */
lpc_lockdown_config(config);
/* SPI lock down configuration */
spi_lockdown_config(config);
/* DMI lock down configuration */
dmi_lockdown_config();
/* PMC lock down configuration */
pmc_lockdown_config();
}
BOOT_STATE_INIT_ENTRY(BS_DEV_RESOURCES, BS_ON_EXIT, platform_lockdown_config,
NULL);
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