soc/intel/common/pch: Add pch lockdown code

pch lockdown functionality can be used by supported PCH.
Right now pch lockdown functionality is applied for SPT
(Skylake SOC) and CNP(Cannon Lake SOC) PCH.

BUG=b:78109109
BRANCH=none
TEST=Build and boot KBL and CNL platform.

Change-Id: I0b81bbc54f737cb4e7120f44bbe705039b45ccb3
Signed-off-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/25688
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

3 files changed, 115 insertions, 0 deletions

diff --git a/src/soc/intel/common/pch/lockdown/Kconfig b/src/soc/intel/common/pch/lockdown/Kconfig
new file mode 100644
index 0000000000..8fce5e785c
--- /dev/null
+++ b/src/soc/intel/common/pch/lockdown/Kconfig
@@ -0,0 +1,7 @@
+config SOC_INTEL_COMMON_PCH_LOCKDOWN
+	bool
+	default n
+	help
+	  This option allows to have chipset lockdown for DMI, FAST_SPI and
+	  soc_lockdown_config() to implement any additional lockdown as PMC,
+	  LPC for supported PCH.
diff --git a/src/soc/intel/common/pch/lockdown/Makefile.inc b/src/soc/intel/common/pch/lockdown/Makefile.inc
new file mode 100644
index 0000000000..f4663f569a
--- /dev/null
+++ b/src/soc/intel/common/pch/lockdown/Makefile.inc
@@ -0,0 +1 @@
+ramstage-$(CONFIG_SOC_INTEL_COMMON_PCH_LOCKDOWN) += lockdown.c
diff --git a/src/soc/intel/common/pch/lockdown/lockdown.c b/src/soc/intel/common/pch/lockdown/lockdown.c
new file mode 100644
index 0000000000..f37d00117e
--- /dev/null
+++ b/src/soc/intel/common/pch/lockdown/lockdown.c
@@ -0,0 +1,107 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018 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 <console/console.h>
+#include <intelblocks/chip.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>
+#include <string.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 (!IS_ENABLED(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);