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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2008-2009 coresystems GmbH
* Copyright (C) 2014 Google Inc.
* 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 <chip.h>
#include <console/console.h>
#include <device/pci_def.h>
#include <intelblocks/fast_spi.h>
#include <intelblocks/pcr.h>
#include <intelblocks/smihandler.h>
#include <soc/p2sb.h>
#include <soc/pci_devs.h>
#include <soc/pcr_ids.h>
#include <soc/pm.h>
#define CSME0_FBE 0xf
#define CSME0_BAR 0x0
#define CSME0_FID 0xb0
const struct smm_save_state_ops *get_smm_save_state_ops(void)
{
return &em64t101_smm_ops;
}
static void pch_configure_endpoints(pci_devfn_t dev, int epmask_id,
uint32_t mask)
{
uint32_t reg32;
reg32 = pci_read_config32(dev, PCH_P2SB_EPMASK(epmask_id));
pci_write_config32(dev, PCH_P2SB_EPMASK(epmask_id), reg32 | mask);
}
static void disable_sideband_access(pci_devfn_t dev)
{
u8 reg8;
uint32_t mask;
/* Remove the host accessing right to PSF register range. */
/* Set p2sb PCI offset EPMASK5 [29, 28, 27, 26] to [1, 1, 1, 1] */
mask = (1 << 29) | (1 << 28) | (1 << 27) | (1 << 26);
pch_configure_endpoints(dev, 5, mask);
/* Set the "Endpoint Mask Lock!", P2SB PCI offset E2h bit[1] to 1. */
reg8 = pci_read_config8(dev, PCH_P2SB_E0 + 2);
pci_write_config8(dev, PCH_P2SB_E0 + 2, reg8 | (1 << 1));
}
static void pch_disable_heci(void)
{
pci_devfn_t dev = PCH_DEV_P2SB;
struct pcr_sbi_msg msg = {
.pid = PID_CSME0,
.offset = 0,
.opcode = PCR_WRITE,
.is_posted = false,
.fast_byte_enable = CSME0_FBE,
.bar = CSME0_BAR,
.fid = CSME0_FID
};
/* Bit 0: Set to make HECI#1 Function disable */
uint32_t data32 = 1;
uint8_t response;
int status;
/* unhide p2sb device */
pci_write_config8(dev, PCH_P2SB_E0 + 1, 0);
/* Send SBI command to make HECI#1 function disable */
status = pcr_execute_sideband_msg(&msg, &data32, &response);
if (status && response)
printk(BIOS_ERR, "Fail to make CSME function disable\n");
/* Ensure to Lock SBI interface after this command */
disable_sideband_access(dev);
/* hide p2sb device */
pci_write_config8(dev, PCH_P2SB_E0 + 1, 1);
}
/*
* Specific SOC SMI handler during ramstage finalize phase
*
* BIOS can't make CSME function disable as is due to POSTBOOT_SAI
* restriction in place from CNP chipset. Hence create SMI Handler to
* perform CSME function disabling logic during SMM mode.
*/
void smihandler_soc_at_finalize(void)
{
const struct soc_intel_cannonlake_config *config;
const struct device *dev = dev_find_slot(0, PCH_DEVFN_CSE);
if (!dev || !dev->chip_info) {
printk(BIOS_ERR, "%s: Could not find SoC devicetree config!\n",
__func__);
return ;
}
config = dev->chip_info;
if (config->HeciEnabled == 0)
pch_disable_heci();
}
void smihandler_soc_check_illegal_access(uint32_t tco_sts)
{
if (!((tco_sts & (1 << 8)) && IS_ENABLED(CONFIG_SPI_FLASH_SMM)
&& fast_spi_wpd_status()))
return;
/*
* BWE is RW, so the SMI was caused by a
* write to BWE, not by a write to the BIOS
*
* This is the place where we notice someone
* is trying to tinker with the BIOS. We are
* trying to be nice and just ignore it. A more
* resolute answer would be to power down the
* box.
*/
printk(BIOS_DEBUG, "Switching back to RO\n");
fast_spi_enable_wp();
}
/* SMI handlers that should be serviced in SCI mode too. */
uint32_t smihandler_soc_get_sci_mask(void)
{
uint32_t sci_mask =
SMI_HANDLER_SCI_EN(APM_STS_BIT) |
SMI_HANDLER_SCI_EN(SMI_ON_SLP_EN_STS_BIT);
return sci_mask;
}
const smi_handler_t southbridge_smi[SMI_STS_BITS] = {
[SMI_ON_SLP_EN_STS_BIT] = smihandler_southbridge_sleep,
[APM_STS_BIT] = smihandler_southbridge_apmc,
[PM1_STS_BIT] = smihandler_southbridge_pm1,
[GPE0_STS_BIT] = smihandler_southbridge_gpe0,
[GPIO_STS_BIT] = smihandler_southbridge_gpi,
[ESPI_SMI_STS_BIT] = smihandler_southbridge_espi,
[MCSMI_STS_BIT] = smihandler_southbridge_mc,
[TCO_STS_BIT] = smihandler_southbridge_tco,
[PERIODIC_STS_BIT] = smihandler_southbridge_periodic,
[MONITOR_STS_BIT] = smihandler_southbridge_monitor,
};
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