soc/amd/stoneyridge: Move LPC support to common

AMD devices traditionally have the LPC-ISA bus at 14.3 and the
definition has been very consistent.  Relocate the feature from
stoneyridge into common/block.

BUG=b:131682806

Change-Id: I8d7175b8642bb17533bb2287b3e3ee3d52e85a75
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32653
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

4 files changed, 667 insertions, 0 deletions

diff --git a/src/soc/amd/common/block/lpc/Kconfig b/src/soc/amd/common/block/lpc/Kconfig
new file mode 100644
index 0000000000..b0d59a55f4
--- /dev/null
+++ b/src/soc/amd/common/block/lpc/Kconfig
@@ -0,0 +1,5 @@
+config SOC_AMD_COMMON_BLOCK_LPC
+	bool
+	default n
+	help
+	  Select this option to use the traditional LPC-ISA bridge at D14F3.
diff --git a/src/soc/amd/common/block/lpc/Makefile.inc b/src/soc/amd/common/block/lpc/Makefile.inc
new file mode 100644
index 0000000000..72b1e42013
--- /dev/null
+++ b/src/soc/amd/common/block/lpc/Makefile.inc
@@ -0,0 +1,8 @@
+ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc.c
+
+bootblock-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc_util.c
+verstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc_util.c
+romstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc_util.c
+postcar-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc_util.c
+ramstage-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc_util.c
+smm-$(CONFIG_SOC_AMD_COMMON_BLOCK_LPC) += lpc_util.c
diff --git a/src/soc/amd/common/block/lpc/lpc.c b/src/soc/amd/common/block/lpc/lpc.c
new file mode 100644
index 0000000000..b896517214
--- /dev/null
+++ b/src/soc/amd/common/block/lpc/lpc.c
@@ -0,0 +1,346 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2010-2017 Advanced Micro Devices, Inc.
+ * Copyright (C) 2014 Sage Electronic Engineering, LLC
+ *
+ * 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 <cbmem.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pnp.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <device/pci_def.h>
+#include <pc80/mc146818rtc.h>
+#include <pc80/isa-dma.h>
+#include <arch/ioapic.h>
+#include <pc80/i8254.h>
+#include <pc80/i8259.h>
+#include <amdblocks/acpimmio.h>
+#include <amdblocks/lpc.h>
+#include <soc/acpi.h>
+#include <soc/southbridge.h>
+#include <soc/nvs.h>
+#include <soc/iomap.h>
+
+/* Most systems should have already enabled the bridge */
+void __weak soc_late_lpc_bridge_enable(void) { }
+
+static void lpc_init(struct device *dev)
+{
+	u8 byte;
+
+	soc_late_lpc_bridge_enable();
+
+	/* Initialize isa dma */
+	isa_dma_init();
+
+	/* Enable DMA transaction on the LPC bus */
+	byte = pci_read_config8(dev, LPC_PCI_CONTROL);
+	byte |= LEGACY_DMA_EN;
+	pci_write_config8(dev, LPC_PCI_CONTROL, byte);
+
+	/* Disable the timeout mechanism on LPC */
+	byte = pci_read_config8(dev, LPC_IO_OR_MEM_DECODE_ENABLE);
+	byte &= ~LPC_SYNC_TIMEOUT_COUNT_ENABLE;
+	pci_write_config8(dev, LPC_IO_OR_MEM_DECODE_ENABLE, byte);
+
+	/* Disable LPC MSI Capability */
+	byte = pci_read_config8(dev, LPC_MISC_CONTROL_BITS);
+	/* BIT 1 is not defined in public datasheet. */
+	byte &= ~(1 << 1);
+
+	/*
+	 * Keep the old way. i.e., when bus master/DMA cycle is going
+	 * on on LPC, it holds PCI grant, so no LPC slave cycle can
+	 * interrupt and visit LPC.
+	 */
+	byte &= ~LPC_NOHOG;
+	pci_write_config8(dev, LPC_MISC_CONTROL_BITS, byte);
+
+	/*
+	 * Enable hand-instance of the pulse generator and SPI prefetch from
+	 * host (earlier is recommended for boot speed).
+	 */
+	byte = pci_read_config8(dev, LPC_HOST_CONTROL);
+	byte |= PREFETCH_EN_SPI_FROM_HOST | T_START_ENH;
+	pci_write_config8(dev, LPC_HOST_CONTROL, byte);
+
+	cmos_check_update_date();
+
+	/*
+	 * Initialize the real time clock.
+	 * The 0 argument tells cmos_init not to
+	 * update CMOS unless it is invalid.
+	 * 1 tells cmos_init to always initialize the CMOS.
+	 */
+	cmos_init(0);
+
+	/* Initialize i8259 pic */
+	setup_i8259();
+
+	/* Initialize i8254 timers */
+	setup_i8254();
+
+	/* Set up SERIRQ, enable continuous mode */
+	byte = (PM_SERIRQ_NUM_BITS_21 | PM_SERIRQ_ENABLE);
+	if (!CONFIG(SERIRQ_CONTINUOUS_MODE))
+		byte |= PM_SERIRQ_MODE;
+
+	pm_write8(PM_SERIRQ_CONF, byte);
+}
+
+static void lpc_read_resources(struct device *dev)
+{
+	struct resource *res;
+	global_nvs_t *gnvs;
+
+	/* Get the normal pci resources of this device */
+	pci_dev_read_resources(dev);
+
+	/* Add an extra subtractive resource for both memory and I/O. */
+	res = new_resource(dev, IOINDEX_SUBTRACTIVE(0, 0));
+	res->base = 0;
+	res->size = 0x1000;
+	res->flags = IORESOURCE_IO | IORESOURCE_SUBTRACTIVE |
+		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+
+	res = new_resource(dev, IOINDEX_SUBTRACTIVE(1, 0));
+	res->base = FLASH_BASE_ADDR;
+	res->size = CONFIG_ROM_SIZE;
+	res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE |
+		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+
+	/* Add a memory resource for the SPI BAR. */
+	fixed_mem_resource(dev, 2, SPI_BASE_ADDRESS / 1024, 1,
+			IORESOURCE_SUBTRACTIVE);
+
+	res = new_resource(dev, 3); /* IOAPIC */
+	res->base = IO_APIC_ADDR;
+	res->size = 0x00001000;
+	res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+
+	/* I2C devices (all 4 devices) */
+	res = new_resource(dev, 4);
+	res->base = I2C_BASE_ADDRESS;
+	res->size = I2C_DEVICE_SIZE * I2C_DEVICE_COUNT;
+	res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+
+	compact_resources(dev);
+
+	/* Allocate ACPI NVS in CBMEM */
+	gnvs = cbmem_add(CBMEM_ID_ACPI_GNVS, sizeof(global_nvs_t));
+	printk(BIOS_DEBUG, "ACPI GNVS at %p\n", gnvs);
+}
+
+static void lpc_set_resources(struct device *dev)
+{
+	struct resource *res;
+	u32 spi_enable_bits;
+
+	/* Special case. The SpiRomEnable and other enables should STAY set. */
+	res = find_resource(dev, 2);
+	spi_enable_bits = pci_read_config32(dev, SPIROM_BASE_ADDRESS_REGISTER);
+	spi_enable_bits &= SPI_BASE_ALIGNMENT - 1;
+	pci_write_config32(dev, SPIROM_BASE_ADDRESS_REGISTER,
+			res->base | spi_enable_bits);
+
+	pci_dev_set_resources(dev);
+}
+
+static void set_child_resource(struct device *dev, struct device *child,
+				u32 *reg, u32 *reg_x)
+{
+	struct resource *res;
+	u32 base, end;
+	u32 rsize = 0, set = 0, set_x = 0;
+	int wideio_index;
+
+	/*
+	 * Be a bit relaxed, tolerate that LPC region might be bigger than
+	 * resource we try to fit, do it like this for all regions < 16 bytes.
+	 * If there is a resource > 16 bytes it must be 512 bytes to be able
+	 * to allocate the fresh LPC window.
+	 *
+	 * AGESA and early initialization can set a wide IO port. This code
+	 * will verify if required region was previously set and will avoid
+	 * setting a new wide IO resource if one is already set.
+	 */
+
+	for (res = child->resource_list; res; res = res->next) {
+		if (!(res->flags & IORESOURCE_IO))
+			continue;
+		base = res->base;
+		end = resource_end(res);
+		printk(BIOS_DEBUG,
+			"Southbridge LPC decode:%s, base=0x%08x, end=0x%08x\n",
+			dev_path(child), base, end);
+		/* find a resource size */
+		switch (base) {
+		case 0x60:	/*  KB */
+		case 0x64:	/*  MS */
+			set |= DECODE_ENABLE_KBC_PORT;
+			rsize = 1;
+			break;
+		case 0x3f8:	/*  COM1 */
+			set |= DECODE_ENABLE_SERIAL_PORT0;
+			rsize = 8;
+			break;
+		case 0x2f8:	/*  COM2 */
+			set |= DECODE_ENABLE_SERIAL_PORT1;
+			rsize = 8;
+			break;
+		case 0x378:	/*  Parallel 1 */
+			set |= DECODE_ENABLE_PARALLEL_PORT0;
+			/* enable 0x778 for ECP mode */
+			set |= DECODE_ENABLE_PARALLEL_PORT1;
+			rsize = 8;
+			break;
+		case 0x3f0:	/*  FD0 */
+			set |= DECODE_ENABLE_FDC_PORT0;
+			rsize = 8;
+			break;
+		case 0x220:	/*  0x220 - 0x227 */
+			set |= DECODE_ENABLE_SERIAL_PORT2;
+			rsize = 8;
+			break;
+		case 0x228:	/*  0x228 - 0x22f */
+			set |= DECODE_ENABLE_SERIAL_PORT3;
+			rsize = 8;
+			break;
+		case 0x238:	/*  0x238 - 0x23f */
+			set |= DECODE_ENABLE_SERIAL_PORT4;
+			rsize = 8;
+			break;
+		case 0x300:	/*  0x300 - 0x301 */
+			set |= DECODE_ENABLE_MIDI_PORT0;
+			rsize = 2;
+			break;
+		case 0x400:
+			set_x |= DECODE_IO_PORT_ENABLE0;
+			rsize = 0x40;
+			break;
+		case 0x480:
+			set_x |= DECODE_IO_PORT_ENABLE1;
+			rsize = 0x40;
+			break;
+		case 0x500:
+			set_x |= DECODE_IO_PORT_ENABLE2;
+			rsize = 0x40;
+			break;
+		case 0x580:
+			set_x |= DECODE_IO_PORT_ENABLE3;
+			rsize = 0x40;
+			break;
+		case 0x4700:
+			set_x |= DECODE_IO_PORT_ENABLE5;
+			rsize = 0xc;
+			break;
+		case 0xfd60:
+			set_x |= DECODE_IO_PORT_ENABLE6;
+			rsize = 16;
+			break;
+		default:
+			rsize = 0;
+			wideio_index = lpc_find_wideio_range(base, res->size);
+			if (wideio_index != WIDEIO_RANGE_ERROR) {
+				rsize = lpc_wideio_size(wideio_index);
+				printk(BIOS_DEBUG, "Covered by wideIO");
+				printk(BIOS_DEBUG, " %d\n", wideio_index);
+			}
+		}
+		/* check if region found and matches the enable */
+		if (res->size <= rsize) {
+			*reg |= set;
+			*reg_x |= set_x;
+		/* check if we can fit resource in variable range */
+		} else {
+			wideio_index = lpc_set_wideio_range(base, res->size);
+			if (wideio_index != WIDEIO_RANGE_ERROR) {
+				/* preserve wide IO related bits. */
+				*reg_x = pci_read_config32(dev,
+					LPC_IO_OR_MEM_DECODE_ENABLE);
+
+				printk(BIOS_DEBUG,
+					"Range assigned to wide IO %d\n",
+					wideio_index);
+			} else {
+				printk(BIOS_ERR,
+					"cannot fit LPC decode region:");
+				printk(BIOS_ERR,
+					"%s, base = 0x%08x, end = 0x%08x\n",
+					dev_path(child), base, end);
+			}
+		}
+	}
+}
+
+/**
+ * @brief Enable resources for children devices
+ *
+ * @param dev the device whose children's resources are to be enabled
+ *
+ */
+static void lpc_enable_childrens_resources(struct device *dev)
+{
+	struct bus *link;
+	u32 reg, reg_x;
+
+	reg = pci_read_config32(dev, LPC_IO_PORT_DECODE_ENABLE);
+	reg_x = pci_read_config32(dev, LPC_IO_OR_MEM_DECODE_ENABLE);
+
+	for (link = dev->link_list; link; link = link->next) {
+		struct device *child;
+		for (child = link->children; child;
+		     child = child->sibling) {
+			if (child->enabled
+			    && (child->path.type == DEVICE_PATH_PNP))
+				set_child_resource(dev, child, &reg, &reg_x);
+		}
+	}
+	pci_write_config32(dev, LPC_IO_PORT_DECODE_ENABLE, reg);
+	pci_write_config32(dev, LPC_IO_OR_MEM_DECODE_ENABLE, reg_x);
+}
+
+static void lpc_enable_resources(struct device *dev)
+{
+	pci_dev_enable_resources(dev);
+	lpc_enable_childrens_resources(dev);
+}
+
+static struct pci_operations lops_pci = {
+	.set_subsystem = pci_dev_set_subsystem,
+};
+
+static struct device_operations lpc_ops = {
+	.read_resources = lpc_read_resources,
+	.set_resources = lpc_set_resources,
+	.enable_resources = lpc_enable_resources,
+	.acpi_inject_dsdt_generator = southbridge_inject_dsdt,
+	.write_acpi_tables = southbridge_write_acpi_tables,
+	.init = lpc_init,
+	.scan_bus = scan_lpc_bus,
+	.ops_pci = &lops_pci,
+};
+
+static const unsigned short pci_device_ids[] = {
+	PCI_DEVICE_ID_AMD_SB900_LPC,
+	PCI_DEVICE_ID_AMD_CZ_LPC,
+	0
+};
+static const struct pci_driver lpc_driver __pci_driver = {
+	.ops = &lpc_ops,
+	.vendor = PCI_VENDOR_ID_AMD,
+	.devices = pci_device_ids,
+};
diff --git a/src/soc/amd/common/block/lpc/lpc_util.c b/src/soc/amd/common/block/lpc/lpc_util.c
new file mode 100644
index 0000000000..008d14c34e
--- /dev/null
+++ b/src/soc/amd/common/block/lpc/lpc_util.c
@@ -0,0 +1,308 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2010-2017 Advanced Micro Devices, Inc.
+ *
+ * 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 <stdint.h>
+#include <device/device.h>
+#include <device/pci_ops.h>
+#include <device/pci_def.h>
+#include <amdblocks/lpc.h>
+#include <soc/iomap.h>
+#include <soc/southbridge.h>
+
+/* The LPC-ISA bridge is always at D14F3 */
+#if !defined(__SIMPLE_DEVICE__)
+#include <device/device.h>
+#define _LPCB_DEV pcidev_on_root(0x14, 0x3)
+#else
+#define _LPCB_DEV PCI_DEV(0, 0x14, 0x3)
+#endif
+
+/*
+ * Structure to simplify code obtaining the total of used wide IO
+ * registers and the size assigned to each.
+ */
+static const struct wide_io_ioport_and_bits {
+	uint32_t enable;
+	uint16_t port;
+	uint8_t alt;
+} wio_io_en[] = {
+	{
+		.enable = LPC_WIDEIO0_ENABLE,
+		.port = LPC_WIDEIO_GENERIC_PORT,
+		.alt = LPC_ALT_WIDEIO0_ENABLE
+	},
+	{
+		.enable = LPC_WIDEIO1_ENABLE,
+		.port = LPC_WIDEIO1_GENERIC_PORT,
+		.alt = LPC_ALT_WIDEIO1_ENABLE
+	},
+	{
+		.enable = LPC_WIDEIO2_ENABLE,
+		.port = LPC_WIDEIO2_GENERIC_PORT,
+		.alt = LPC_ALT_WIDEIO2_ENABLE
+	}
+};
+
+/**
+ * @brief Find the size of a particular wide IO
+ *
+ * @param index = index of desired wide IO
+ *
+ * @return size of desired wide IO
+ */
+uint16_t lpc_wideio_size(int index)
+{
+	uint32_t enable_register;
+	uint16_t size = 0;
+	uint8_t alternate_register;
+
+	if (index >= ARRAY_SIZE(wio_io_en))
+		return size;
+	enable_register = pci_read_config32(_LPCB_DEV,
+				LPC_IO_OR_MEM_DECODE_ENABLE);
+	alternate_register = pci_read_config8(_LPCB_DEV,
+				LPC_ALT_WIDEIO_RANGE_ENABLE);
+	if (enable_register & wio_io_en[index].enable)
+		size = (alternate_register & wio_io_en[index].alt) ?
+				16 : 512;
+	return size;
+}
+
+/**
+ * @brief Identify if any LPC wide IO is covering the IO range
+ *
+ * @param start = start of IO range
+ * @param size = size of IO range
+ *
+ * @return Index of wide IO covering the range or error
+ */
+int lpc_find_wideio_range(uint16_t start, uint16_t size)
+{
+	int i, index = WIDEIO_RANGE_ERROR;
+	uint16_t end, current_size, start_wideio, end_wideio;
+
+	end = start + size;
+	for (i = 0; i < ARRAY_SIZE(wio_io_en); i++) {
+		current_size = lpc_wideio_size(i);
+		if (current_size == 0)
+			continue;
+		start_wideio = pci_read_config16(_LPCB_DEV,
+						 wio_io_en[i].port);
+		end_wideio = start_wideio + current_size;
+		if ((start >= start_wideio) && (end <= end_wideio)) {
+			index = i;
+			break;
+		}
+	}
+	return index;
+}
+
+/**
+ * @brief Program a LPC wide IO to support an IO range
+ *
+ * @param start = start of range to be routed through wide IO
+ * @param size = size of range to be routed through wide IO
+ *
+ * @return Index of wide IO register used or error
+ */
+int lpc_set_wideio_range(uint16_t start, uint16_t size)
+{
+	int i, index = WIDEIO_RANGE_ERROR;
+	uint32_t enable_register;
+	uint8_t alternate_register;
+
+	enable_register = pci_read_config32(_LPCB_DEV,
+					   LPC_IO_OR_MEM_DECODE_ENABLE);
+	alternate_register = pci_read_config8(_LPCB_DEV,
+					      LPC_ALT_WIDEIO_RANGE_ENABLE);
+	for (i = 0; i < ARRAY_SIZE(wio_io_en); i++) {
+		if (enable_register & wio_io_en[i].enable)
+			continue;
+		index = i;
+		pci_write_config16(_LPCB_DEV, wio_io_en[i].port, start);
+		enable_register |= wio_io_en[i].enable;
+		pci_write_config32(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE,
+				   enable_register);
+		if (size <= 16)
+			alternate_register |= wio_io_en[i].alt;
+		else
+			alternate_register &= ~wio_io_en[i].alt;
+		pci_write_config8(_LPCB_DEV,
+				  LPC_ALT_WIDEIO_RANGE_ENABLE,
+				  alternate_register);
+		break;
+	}
+	return index;
+}
+
+void lpc_enable_port80(void)
+{
+	u8 byte;
+
+	byte = pci_read_config8(_LPCB_DEV, LPC_IO_OR_MEM_DEC_EN_HIGH);
+	byte |= DECODE_IO_PORT_ENABLE4_H;
+	pci_write_config8(_LPCB_DEV, LPC_IO_OR_MEM_DEC_EN_HIGH, byte);
+}
+
+void lpc_enable_pci_port80(void)
+{
+	u8 byte;
+
+	byte = pci_read_config8(_LPCB_DEV, LPC_IO_OR_MEM_DEC_EN_HIGH);
+	byte &= ~DECODE_IO_PORT_ENABLE4_H; /* disable lpc port 80 */
+	pci_write_config8(_LPCB_DEV, LPC_IO_OR_MEM_DEC_EN_HIGH, byte);
+}
+
+void lpc_enable_decode(uint32_t decodes)
+{
+	pci_write_config32(_LPCB_DEV, LPC_IO_PORT_DECODE_ENABLE, decodes);
+}
+
+uintptr_t lpc_spibase(void)
+{
+	u32 base, enables;
+
+	/* Make sure the base address is predictable */
+	base = pci_read_config32(_LPCB_DEV, SPIROM_BASE_ADDRESS_REGISTER);
+	enables = base & SPI_PRESERVE_BITS;
+	base &= ~(SPI_PRESERVE_BITS | SPI_BASE_RESERVED);
+
+	if (!base) {
+		base = SPI_BASE_ADDRESS;
+		pci_write_config32(_LPCB_DEV, SPIROM_BASE_ADDRESS_REGISTER,
+					base | enables | SPI_ROM_ENABLE);
+		/* PCI_COMMAND_MEMORY is read-only and enabled. */
+	}
+	return base;
+}
+
+/*
+ * Enable FCH to decode TPM associated Memory and IO regions
+ *
+ * Enable decoding of TPM cycles defined in TPM 1.2 spec
+ * Enable decoding of legacy TPM addresses: IO addresses 0x7f-
+ * 0x7e and 0xef-0xee.
+ * This function should be called if TPM is connected in any way to the FCH and
+ * conforms to the regions decoded.
+ * Absent any other routing configuration the TPM cycles will be claimed by the
+ * LPC bus
+ */
+void lpc_tpm_decode(void)
+{
+	u32 value;
+
+	value = pci_read_config32(_LPCB_DEV, LPC_TRUSTED_PLATFORM_MODULE);
+	value |= TPM_12_EN | TPM_LEGACY_EN;
+	pci_write_config32(_LPCB_DEV, LPC_TRUSTED_PLATFORM_MODULE, value);
+}
+
+/*
+ * Enable FCH to decode TPM associated Memory and IO regions to SPI
+ *
+ * This should be used if TPM is connected to SPI bus.
+ * Assumes SPI address space is already configured via a call to lpc_spibase().
+ */
+void lpc_tpm_decode_spi(void)
+{
+	/* Enable TPM decoding to FCH */
+	lpc_tpm_decode();
+
+	/* Route TPM accesses to SPI */
+	u32 spibase = pci_read_config32(_LPCB_DEV,
+					SPIROM_BASE_ADDRESS_REGISTER);
+	pci_write_config32(_LPCB_DEV, SPIROM_BASE_ADDRESS_REGISTER, spibase
+					| ROUTE_TPM_2_SPI);
+}
+
+/*
+ * Enable 4MB (LPC) ROM access at 0xFFC00000 - 0xFFFFFFFF.
+ *
+ * Hardware should enable LPC ROM by pin straps. This function does not
+ * handle the theoretically possible PCI ROM, FWH, or SPI ROM configurations.
+ *
+ * The southbridge power-on default is to map 512K ROM space.
+ *
+ */
+void lpc_enable_rom(void)
+{
+	u8 reg8;
+
+	/*
+	 * Decode variable LPC ROM address ranges 1 and 2.
+	 * Bits 3-4 are not defined in any publicly available datasheet
+	 */
+	reg8 = pci_read_config8(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE);
+	reg8 |= (1 << 3) | (1 << 4);
+	pci_write_config8(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE, reg8);
+
+	/*
+	 * LPC ROM address range 1:
+	 * Enable LPC ROM range mirroring start at 0x000e(0000).
+	 */
+	pci_write_config16(_LPCB_DEV, ROM_ADDRESS_RANGE1_START, 0x000e);
+
+	/* Enable LPC ROM range mirroring end at 0x000f(ffff). */
+	pci_write_config16(_LPCB_DEV, ROM_ADDRESS_RANGE1_END, 0x000f);
+
+	/*
+	 * LPC ROM address range 2:
+	 *
+	 * Enable LPC ROM range start at:
+	 * 0xfff8(0000): 512KB
+	 * 0xfff0(0000): 1MB
+	 * 0xffe0(0000): 2MB
+	 * 0xffc0(0000): 4MB
+	 */
+	pci_write_config16(_LPCB_DEV, ROM_ADDRESS_RANGE2_START, 0x10000
+					- (CONFIG_COREBOOT_ROMSIZE_KB >> 6));
+
+	/* Enable LPC ROM range end at 0xffff(ffff). */
+	pci_write_config16(_LPCB_DEV, ROM_ADDRESS_RANGE2_END, 0xffff);
+}
+
+void lpc_enable_spi_prefetch(void)
+{
+	uint32_t dword;
+
+	dword = pci_read_config32(_LPCB_DEV, LPC_ROM_DMA_EC_HOST_CONTROL);
+	dword |= SPI_FROM_HOST_PREFETCH_EN | SPI_FROM_USB_PREFETCH_EN;
+	pci_write_config32(_LPCB_DEV, LPC_ROM_DMA_EC_HOST_CONTROL, dword);
+}
+
+uintptr_t lpc_get_spibase(void)
+{
+	u32 base;
+
+	base = pci_read_config32(_LPCB_DEV, SPIROM_BASE_ADDRESS_REGISTER);
+	base = ALIGN_DOWN(base, SPI_BASE_ALIGNMENT);
+	return (uintptr_t)base;
+}
+
+void lpc_set_spibase(u32 base, u32 enable)
+{
+	u32 reg32;
+
+	/* only two types of CS# enables are allowed */
+	enable &= SPI_ROM_ENABLE | SPI_ROM_ALT_ENABLE;
+
+	reg32 = pci_read_config32(_LPCB_DEV, SPIROM_BASE_ADDRESS_REGISTER);
+
+	reg32 &= SPI_BASE_ALIGNMENT - 1; /* preserve only reserved, enables */
+	reg32 &= ~(SPI_ROM_ENABLE | SPI_ROM_ALT_ENABLE);
+	reg32 |= enable;
+	reg32 |= ALIGN_DOWN(base, SPI_BASE_ALIGNMENT);
+
+	pci_write_config32(_LPCB_DEV, SPIROM_BASE_ADDRESS_REGISTER, reg32);
+}