Revert "mb/aopen/dxplplusu: Remove board"

This reverts commit eb76a455cd39ec59b7f2ba28baeec9538befd59e
and applies minor fixes to make it build again.

PARALLEL_MP was working prior to board removal and no
relevant SMI handlers were implemented. So NO_SMM choice
is now selected.

Change-Id: Ia1cd02278240d1b5d006fb2a7730d3d86390f85b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69339
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

13 files changed, 1135 insertions, 0 deletions

diff --git a/src/southbridge/intel/i82801dx/Kconfig b/src/southbridge/intel/i82801dx/Kconfig
new file mode 100644
index 0000000000..98c1a477ff
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+config SOUTHBRIDGE_INTEL_I82801DX
+	bool
+	select ACPI_INTEL_HARDWARE_SLEEP_VALUES
+	select SOUTHBRIDGE_INTEL_COMMON_SMBUS
+	select SOUTHBRIDGE_INTEL_COMMON_EARLY_SMBUS
+	select SOUTHBRIDGE_INTEL_COMMON_RTC
+	select SOUTHBRIDGE_INTEL_COMMON_RESET
+	select SOUTHBRIDGE_INTEL_COMMON_USB_DEBUG
+	select HAVE_POWER_STATE_AFTER_FAILURE
+	select HAVE_POWER_STATE_PREVIOUS_AFTER_FAILURE
+	select BOOT_DEVICE_NOT_SPI_FLASH
+
+if SOUTHBRIDGE_INTEL_I82801DX
+
+config EHCI_BAR
+	hex
+	default 0xfef00000
+
+endif
diff --git a/src/southbridge/intel/i82801dx/Makefile.inc b/src/southbridge/intel/i82801dx/Makefile.inc
new file mode 100644
index 0000000000..c352e3e9e8
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/Makefile.inc
@@ -0,0 +1,17 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+ifeq ($(CONFIG_SOUTHBRIDGE_INTEL_I82801DX),y)
+
+ramstage-y += i82801dx.c
+ramstage-y += ac97.c
+ramstage-y += fadt.c
+ramstage-y += ide.c
+ramstage-y += lpc.c
+ramstage-y += usb.c
+ramstage-y += usb2.c
+
+romstage-y += early_smbus.c
+
+bootblock-y += bootblock.c
+
+endif
diff --git a/src/southbridge/intel/i82801dx/ac97.c b/src/southbridge/intel/i82801dx/ac97.c
new file mode 100644
index 0000000000..bca35eb7c9
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/ac97.c
@@ -0,0 +1,262 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <arch/io.h>
+#include <device/pci_ops.h>
+#include <delay.h>
+#include "i82801dx.h"
+
+#define NAMBAR		0x10
+#define   MASTER_VOL	0x02
+#define   PAGING	0x24
+#define   EXT_AUDIO	0x28
+#define   FUNC_SEL	0x66
+#define   INFO_IO	0x68
+#define   CONNECTOR	0x6a
+#define   VENDOR_ID1	0x7c
+#define   VENDOR_ID2	0x7e
+#define   SEC_VENDOR_ID1 0xfc
+#define   SEC_VENDOR_ID2 0xfe
+
+#define NABMBAR		0x14
+#define   GLOB_CNT	0x2c
+#define   GLOB_STA	0x30
+#define   CAS		0x34
+
+#define MMBAR		0x10
+#define   EXT_MODEM_ID1	0x3c
+#define   EXT_MODEM_ID2	0xbc
+
+#define MBAR		0x14
+#define   SEC_CODEC	0x40
+
+/* FIXME. This table is probably mainboard specific */
+static u16 ac97_function[16*2][4] = {
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) },
+	{ (1 << 5), (2 << 11), (1 << 10), (3 << 13) }
+};
+
+static u16 nabmbar;
+static u16 nambar;
+
+static int ac97_semaphore(void)
+{
+	int timeout;
+	u8 reg8;
+
+	timeout = 0xffff;
+	do {
+		reg8 = inb(nabmbar + CAS);
+		timeout--;
+	} while ((reg8 & 1) && timeout);
+	if (!timeout)
+		printk(BIOS_DEBUG, "Timeout!\n");
+
+	return (!timeout);
+}
+
+static void init_cnr(void)
+{
+	// TODO
+}
+
+static void program_sigid(struct device *dev, u32 id)
+{
+	pci_write_config32(dev, 0x2c, id);
+}
+
+static void ac97_audio_init(struct device *dev)
+{
+	u16 reg16;
+	u32 reg32;
+	int i;
+
+	printk(BIOS_DEBUG, "Initializing AC'97 Audio.\n");
+
+	/* top 16 bits are zero, so don't read them */
+	nabmbar = pci_read_config16(dev, NABMBAR) & 0xfffe;
+	nambar = pci_read_config16(dev, NAMBAR) & 0xfffe;
+
+	reg16 = inw(nabmbar + GLOB_CNT);
+	reg16 |= (1 << 1); /* Remove AC_RESET# */
+	outw(reg16, nabmbar + GLOB_CNT);
+
+	/* Wait 600ms. Ouch. */
+	udelay(600 * 1000);
+
+	init_cnr();
+
+	/* Detect Primary AC'97 Codec */
+	reg32 = inl(nabmbar + GLOB_STA);
+	if ((reg32 & ((1 << 28) | (1 << 9) | (1 << 8))) == 0) {
+		/* Primary Codec not found */
+		printk(BIOS_DEBUG, "No primary codec. Disabling AC'97 Audio.\n");
+		return;
+	}
+
+	ac97_semaphore();
+
+	/* Detect if codec is programmable */
+	outw(0x8000, nambar + MASTER_VOL);
+	ac97_semaphore();
+	if (inw(nambar + MASTER_VOL) != 0x8000) {
+		printk(BIOS_DEBUG, "Codec not programmable. Disabling AC'97 Audio.\n");
+		return;
+	}
+
+	/* Program Vendor IDs */
+	reg32 = inw(nambar + VENDOR_ID1);
+	reg32 <<= 16;
+	reg32 |= (u16)inw(nambar + VENDOR_ID2);
+
+	program_sigid(dev, reg32);
+
+	/* Is Codec AC'97 2.3 compliant? */
+	reg16 = inw(nambar + EXT_AUDIO);
+	/* [11:10] = 10b -> AC'97 2.3 */
+	if ((reg16 & 0x0c00) != 0x0800) {
+		/* No 2.3 Codec. We're done */
+		return;
+	}
+
+	/* Select Page 1 */
+	reg16 = inw(nambar + PAGING);
+	reg16 &= 0xfff0;
+	reg16 |= 0x0001;
+	outw(reg16, nambar + PAGING);
+
+	for (i = 0x0a * 2; i > 0; i--) {
+		outw(i, nambar + FUNC_SEL);
+
+		/* Function could not be selected. Next one */
+		if (inw(nambar + FUNC_SEL) != i)
+			continue;
+
+		reg16 = inw(nambar + INFO_IO);
+
+		/* Function Information present? */
+		if (!(reg16 & (1 << 0)))
+			continue;
+
+		/* Function Information valid? */
+		if (!(reg16 & (1 << 4)))
+			continue;
+
+		/* Program Buffer Delay [9:5] */
+		reg16 &= 0x03e0;
+		reg16 |= ac97_function[i][0];
+
+		/* Program Gain [15:11] */
+		reg16 |= ac97_function[i][1];
+
+		/* Program Inversion [10] */
+		reg16 |= ac97_function[i][2];
+
+		outw(reg16, nambar + INFO_IO);
+
+		/* Program Connector / Jack Location */
+		reg16 = inw(nambar + CONNECTOR);
+		reg16 &= 0x1fff;
+		reg16 |= ac97_function[i][3];
+		outw(reg16, nambar + CONNECTOR);
+	}
+}
+
+static void ac97_modem_init(struct device *dev)
+{
+	u16 reg16;
+	u32 reg32;
+	u16 mmbar, mbar;
+
+	mmbar = pci_read_config16(dev, MMBAR) & 0xfffe;
+	mbar = pci_read_config16(dev, MBAR) & 0xfffe;
+
+	reg16 = inw(mmbar + EXT_MODEM_ID1);
+	if ((reg16 & 0xc000) != 0xc000) {
+		if (reg16 & (1 << 0)) {
+			reg32 = inw(mmbar + VENDOR_ID2);
+			reg32 <<= 16;
+			reg32 |= (u16)inw(mmbar + VENDOR_ID1);
+			program_sigid(dev, reg32);
+			return;
+		}
+	}
+
+	/* Secondary codec? */
+	reg16 = inw(mbar + SEC_CODEC);
+	if ((reg16 & (1 << 9)) == 0)
+		return;
+
+	reg16 = inw(mmbar + EXT_MODEM_ID2);
+	if ((reg16 & 0xc000) == 0x4000) {
+		if (reg16 & (1 << 0)) {
+			reg32 = inw(mmbar + SEC_VENDOR_ID2);
+			reg32 <<= 16;
+			reg32 |= (u16)inw(mmbar + SEC_VENDOR_ID1);
+			program_sigid(dev, reg32);
+			return;
+		}
+	}
+}
+
+static struct device_operations ac97_audio_ops  = {
+	.read_resources   = pci_dev_read_resources,
+	.set_resources    = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.enable           = i82801dx_enable,
+	.init             = ac97_audio_init,
+};
+
+static struct device_operations ac97_modem_ops  = {
+	.read_resources   = pci_dev_read_resources,
+	.set_resources    = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.enable           = i82801dx_enable,
+	.init             = ac97_modem_init,
+};
+
+/* 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) */
+static const struct pci_driver i82801db_ac97_audio __pci_driver = {
+	.ops	= &ac97_audio_ops,
+	.vendor	= PCI_VID_INTEL,
+	.device	= PCI_DID_INTEL_82801DB_AC97_AUDIO,
+};
+
+static const struct pci_driver i82801db_ac97_modem __pci_driver = {
+	.ops	= &ac97_modem_ops,
+	.vendor	= PCI_VID_INTEL,
+	.device	= PCI_DID_INTEL_82801DB_AC97_MODEM,
+};
diff --git a/src/southbridge/intel/i82801dx/bootblock.c b/src/southbridge/intel/i82801dx/bootblock.c
new file mode 100644
index 0000000000..6cda0a87a4
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/bootblock.c
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/bootblock.h>
+#include <device/pci_ops.h>
+
+void bootblock_early_southbridge_init(void)
+{
+	/* Set FWH IDs for 2 MB flash part. */
+	if (CONFIG_ROM_SIZE == 0x200000)
+		pci_write_config32(PCI_DEV(0, 0x1f, 0), 0xe8, 0x00001111);
+}
diff --git a/src/southbridge/intel/i82801dx/chip.h b/src/southbridge/intel/i82801dx/chip.h
new file mode 100644
index 0000000000..50f4f1c998
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/chip.h
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef I82801DX_CHIP_H
+#define I82801DX_CHIP_H
+
+#include <stdint.h>
+
+struct southbridge_intel_i82801dx_config {
+	int enable_usb;
+	int enable_native_ide;
+	/**
+	 * Interrupt Routing configuration
+	 * If bit7 is 1, the interrupt is disabled.
+	 */
+	uint8_t pirqa_routing;
+	uint8_t pirqb_routing;
+	uint8_t pirqc_routing;
+	uint8_t pirqd_routing;
+	uint8_t pirqe_routing;
+	uint8_t pirqf_routing;
+	uint8_t pirqg_routing;
+	uint8_t pirqh_routing;
+
+	uint8_t ide0_enable;
+	uint8_t ide1_enable;
+};
+
+#endif /* I82801DX_CHIP_H */
diff --git a/src/southbridge/intel/i82801dx/early_smbus.c b/src/southbridge/intel/i82801dx/early_smbus.c
new file mode 100644
index 0000000000..76ef1b8a15
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/early_smbus.c
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/smbus_host.h>
+#include "i82801dx.h"
+
+void i82801dx_early_init(void)
+{
+	enable_smbus();
+}
diff --git a/src/southbridge/intel/i82801dx/fadt.c b/src/southbridge/intel/i82801dx/fadt.c
new file mode 100644
index 0000000000..e12b2cae1f
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/fadt.c
@@ -0,0 +1,80 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/pci_ops.h>
+#include <acpi/acpi.h>
+#include <version.h>
+
+/* FIXME: This needs to go into a separate .h file
+ * to be included by the ich7 smi handler, ich7 smi init
+ * code and the mainboard fadt.
+ */
+#define APM_CNT		0x0   /* ACPI mode only */
+#define   CST_CONTROL	0x85
+#define   PST_CONTROL	0x0
+#define   ACPI_DISABLE	0xAA
+#define   ACPI_ENABLE	0x55
+#define   S4_BIOS	0x77
+#define   GNVS_UPDATE   0xea
+
+void acpi_fill_fadt(acpi_fadt_t *fadt)
+{
+	u16 pmbase = pci_read_config16(pcidev_on_root(0x1f, 0), 0x40) & 0xfffe;
+
+	fadt->sci_int = 0x9;
+
+	if (permanent_smi_handler()) {
+		fadt->smi_cmd = APM_CNT;
+		fadt->acpi_enable = ACPI_ENABLE;
+		fadt->acpi_disable = ACPI_DISABLE;
+		fadt->pstate_cnt = PST_CONTROL;
+	}
+
+	fadt->pm1a_evt_blk = pmbase;
+	fadt->pm1a_cnt_blk = pmbase + 0x4;
+	fadt->pm_tmr_blk = pmbase + 0x8;
+	fadt->gpe0_blk = pmbase + 0x28;
+
+	fadt->pm1_evt_len = 4;
+	fadt->pm1_cnt_len = 2;
+	fadt->pm_tmr_len = 4;
+	fadt->gpe0_blk_len = 8;
+	fadt->p_lvl2_lat = 1;
+	fadt->p_lvl3_lat = 85;
+	fadt->duty_offset = 1;
+	fadt->duty_width = 0;
+	fadt->day_alrm = 0xd;
+	fadt->mon_alrm = 0x00;
+	fadt->iapc_boot_arch = ACPI_FADT_LEGACY_DEVICES | ACPI_FADT_8042;
+
+	fadt->flags |= ACPI_FADT_WBINVD | ACPI_FADT_C1_SUPPORTED |
+			ACPI_FADT_C2_MP_SUPPORTED | ACPI_FADT_SLEEP_BUTTON |
+			ACPI_FADT_S4_RTC_WAKE | ACPI_FADT_PLATFORM_CLOCK;
+
+	fadt->x_pm1a_evt_blk.space_id = ACPI_ADDRESS_SPACE_IO;
+	fadt->x_pm1a_evt_blk.bit_width = fadt->pm1_evt_len * 8;
+	fadt->x_pm1a_evt_blk.bit_offset = 0;
+	fadt->x_pm1a_evt_blk.access_size = ACPI_ACCESS_SIZE_UNDEFINED;
+	fadt->x_pm1a_evt_blk.addrl = fadt->pm1a_evt_blk;
+	fadt->x_pm1a_evt_blk.addrh = 0x0;
+
+	fadt->x_pm1a_cnt_blk.space_id = ACPI_ADDRESS_SPACE_IO;
+	fadt->x_pm1a_cnt_blk.bit_width = fadt->pm1_cnt_len * 8;
+	fadt->x_pm1a_cnt_blk.bit_offset = 0;
+	fadt->x_pm1a_cnt_blk.access_size = ACPI_ACCESS_SIZE_UNDEFINED;
+	fadt->x_pm1a_cnt_blk.addrl = fadt->pm1a_cnt_blk;
+	fadt->x_pm1a_cnt_blk.addrh = 0x0;
+
+	fadt->x_pm_tmr_blk.space_id = ACPI_ADDRESS_SPACE_IO;
+	fadt->x_pm_tmr_blk.bit_width = fadt->pm_tmr_len * 8;
+	fadt->x_pm_tmr_blk.bit_offset = 0;
+	fadt->x_pm_tmr_blk.access_size = ACPI_ACCESS_SIZE_UNDEFINED;
+	fadt->x_pm_tmr_blk.addrl = fadt->pm_tmr_blk;
+	fadt->x_pm_tmr_blk.addrh = 0x0;
+
+	fadt->x_gpe0_blk.space_id = ACPI_ADDRESS_SPACE_IO;
+	fadt->x_gpe0_blk.bit_width = fadt->gpe0_blk_len * 8;
+	fadt->x_gpe0_blk.bit_offset = 0;
+	fadt->x_gpe0_blk.access_size = ACPI_ACCESS_SIZE_UNDEFINED;
+	fadt->x_gpe0_blk.addrl = fadt->gpe0_blk;
+	fadt->x_gpe0_blk.addrh = 0x0;
+}
diff --git a/src/southbridge/intel/i82801dx/i82801dx.c b/src/southbridge/intel/i82801dx/i82801dx.c
new file mode 100644
index 0000000000..921cb1c8aa
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/i82801dx.c
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ops.h>
+#include "i82801dx.h"
+
+void i82801dx_enable(struct device *dev)
+{
+	unsigned int index = 0;
+	uint8_t bHasDisableBit = 0;
+	uint16_t cur_disable_mask, new_disable_mask;
+
+//      all 82801dbm devices are in bus 0
+	unsigned int devfn = PCI_DEVFN(0x1f, 0);	// lpc
+	struct device *lpc_dev = pcidev_path_on_root(devfn);	// 0
+	if (!lpc_dev)
+		return;
+
+	// Calculate disable bit position for specified device:function
+	// NOTE: For ICH-4, only the following devices can be disabled:
+	//               D31: F0, F1, F3, F5, F6,
+	//               D29: F0, F1, F2, F7
+
+	if (PCI_SLOT(dev->path.pci.devfn) == 31) {
+		index = PCI_FUNC(dev->path.pci.devfn);
+
+		switch (index) {
+		case 0:
+		case 1:
+		case 3:
+		case 5:
+		case 6:
+			bHasDisableBit = 1;
+			break;
+
+		default:
+			break;
+		};
+
+		if (index == 0)
+			index = 14;	// D31:F0 bit is an exception
+
+	} else if (PCI_SLOT(dev->path.pci.devfn) == 29) {
+		index = 8 + PCI_FUNC(dev->path.pci.devfn);
+
+		if ((PCI_FUNC(dev->path.pci.devfn) < 3)
+		    || (PCI_FUNC(dev->path.pci.devfn) == 7))
+			bHasDisableBit = 1;
+	}
+
+	if (bHasDisableBit) {
+		cur_disable_mask = pci_read_config16(lpc_dev, FUNC_DIS);
+		new_disable_mask = cur_disable_mask & ~(1 << index);	// enable it
+		if (!dev->enabled) {
+			new_disable_mask |= (1 << index);	// disable it
+		}
+		if (new_disable_mask != cur_disable_mask) {
+			pci_write_config16(lpc_dev, FUNC_DIS, new_disable_mask);
+		}
+	}
+}
+
+struct chip_operations southbridge_intel_i82801dx_ops = {
+	CHIP_NAME("Intel ICH4/ICH4-M (82801Dx) Series Southbridge")
+	    .enable_dev = i82801dx_enable,
+};
diff --git a/src/southbridge/intel/i82801dx/i82801dx.h b/src/southbridge/intel/i82801dx/i82801dx.h
new file mode 100644
index 0000000000..e63327c01e
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/i82801dx.h
@@ -0,0 +1,171 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* the problem: we have 82801dbm support in fb1, and 82801er in fb2.
+ * fb1 code is what we want, fb2 structure is needed however.
+ * so we need to get fb1 code for 82801dbm into fb2 structure.
+ */
+/* What I did: took the 80801er stuff from fb2, verify it against the
+ * db stuff in fb1, and made sure it was right.
+ */
+
+#ifndef I82801DX_H
+#define I82801DX_H
+
+#include <acpi/acpi.h>
+
+#if !defined(__ASSEMBLER__)
+
+#include <device/device.h>
+
+void i82801dx_enable(struct device *dev);
+void i82801dx_early_init(void);
+
+#endif
+
+#define DEBUG_PERIODIC_SMIS 0
+
+#define MAINBOARD_POWER_OFF	0
+#define MAINBOARD_POWER_ON	1
+#define MAINBOARD_POWER_KEEP	2
+
+/*
+ * 000 = Non-combined. P0 is primary master. P1 is secondary master.
+ * 001 = Non-combined. P0 is secondary master. P1 is primary master.
+ * 100 = Combined. P0 is primary master. P1 is primary slave. IDE is secondary;
+ *       Primary IDE channel disabled.
+ * 101 = Combined. P0 is primary slave. P1 is primary master. IDE is secondary.
+ * 110 = Combined. IDE is primary. P0 is secondary master. P1 is secondary
+ *       slave; Secondary IDE channel disabled.
+ * 111 = Combined. IDE is primary. P0 is secondary slave. P1 is secondary master.
+ */
+/* PCI Configuration Space (D31:F1) */
+#define IDE_TIM_PRI		0x40	/* IDE timings, primary */
+#define IDE_TIM_SEC		0x42	/* IDE timings, secondary */
+
+/* IDE_TIM bits */
+#define IDE_DECODE_ENABLE	(1 << 15)
+
+#define PCI_DMA_CFG     0x90
+#define SERIRQ_CNTL     0x64
+#define GEN_CNTL        0xd0
+#define GEN_STS         0xd4
+#define RTC_CONF        0xd8
+#define GEN_PMCON_3     0xa4
+
+#define PCICMD          0x04
+#define PMBASE          0x40
+#define   PMBASE_ADDR	0x0400
+#define   DEFAULT_PMBASE PMBASE_ADDR
+#define ACPI_CNTL       0x44
+#define   ACPI_EN	(1 << 4)
+#define BIOS_CNTL       0x4E
+#define GPIO_BASE       0x58
+#define GPIO_CNTL       0x5C
+#define   GPIOBASE_ADDR 0x0500
+#define PIRQA_ROUT	0x60
+#define PIRQB_ROUT	0x61
+#define PIRQC_ROUT	0x62
+#define PIRQD_ROUT	0x63
+#define PIRQE_ROUT	0x68
+#define PIRQF_ROUT	0x69
+#define PIRQG_ROUT	0x6A
+#define PIRQH_ROUT	0x6B
+#define COM_DEC         0xE0
+#define LPC_EN          0xE6
+#define FUNC_DIS        0xF2
+
+/* 1e f0 244e */
+
+#define CMD             0x04
+#define SBUS_NUM        0x19
+#define SUB_BUS_NUM     0x1A
+#define SMLT            0x1B
+#define IOBASE          0x1C
+#define IOLIM           0x1D
+#define MEMBASE         0x20
+#define MEMLIM          0x22
+#define CNF             0x50
+#define MTT             0x70
+#define PCI_MAST_STS    0x82
+
+#define RTC_FAILED      (1 << 2)
+
+#define PM1_STS		0x00
+#define   WAK_STS	(1 << 15)
+#define   PCIEXPWAK_STS	(1 << 14)
+#define   PRBTNOR_STS	(1 << 11)
+#define   RTC_STS	(1 << 10)
+#define   PWRBTN_STS	(1 << 8)
+#define   GBL_STS	(1 << 5)
+#define   BM_STS	(1 << 4)
+#define   TMROF_STS	(1 << 0)
+#define PM1_EN		0x02
+#define   PCIEXPWAK_DIS	(1 << 14)
+#define   RTC_EN	(1 << 10)
+#define   PWRBTN_EN	(1 << 8)
+#define   GBL_EN	(1 << 5)
+#define   TMROF_EN	(1 << 0)
+#define PM1_CNT		0x04
+#define   GBL_RLS	(1 << 2)
+#define   BM_RLD	(1 << 1)
+#define   SCI_EN	(1 << 0)
+#define PM1_TMR		0x08
+#define PROC_CNT	0x10
+#define LV2		0x14
+#define LV3		0x15
+#define LV4		0x16
+#define PM2_CNT		0x20 // mobile only
+#define GPE0_STS	0x28
+#define   PME_B0_STS	(1 << 13)
+#define   USB3_STS	(1 << 12)
+#define   PME_STS	(1 << 11)
+#define   BATLOW_STS	(1 << 10)
+#define   GST_STS	(1 << 9)
+#define   RI_STS	(1 << 8)
+#define   SMB_WAK_STS	(1 << 7)
+#define   TCOSCI_STS	(1 << 6)
+#define   AC97_STS	(1 << 5)
+#define   USB2_STS	(1 << 4)
+#define   USB1_STS	(1 << 3)
+#define   SWGPE_STS	(1 << 2)
+#define   HOT_PLUG_STS	(1 << 1)
+#define   THRM_STS	(1 << 0)
+#define GPE0_EN		0x2c
+#define   PME_B0_EN	(1 << 13)
+#define   PME_EN	(1 << 11)
+#define SMI_EN		0x30
+#define   EL_SMI_EN	 (1 << 25) // Intel Quick Resume Technology
+#define   INTEL_USB2_EN	 (1 << 18) // Intel-Specific USB2 SMI logic
+#define   LEGACY_USB2_EN (1 << 17) // Legacy USB2 SMI logic
+#define   PERIODIC_EN	 (1 << 14) // SMI on PERIODIC_STS in SMI_STS
+#define   TCO_EN	 (1 << 13) // Enable TCO Logic (BIOSWE et al)
+#define   MCSMI_EN	 (1 << 11) // Trap microcontroller range access
+#define   BIOS_RLS	 (1 <<  7) // asserts SCI on bit set
+#define   SWSMI_TMR_EN	 (1 <<  6) // start software smi timer on bit set
+#define   APMC_EN	 (1 <<  5) // Writes to APM_CNT cause SMI#
+#define   SLP_SMI_EN	 (1 <<  4) // Write to SLP_EN in PM1_CNT asserts SMI#
+#define   LEGACY_USB_EN  (1 <<  3) // Legacy USB circuit SMI logic
+#define   BIOS_EN	 (1 <<  2) // Assert SMI# on setting GBL_RLS bit
+#define   EOS		 (1 <<  1) // End of SMI (deassert SMI#)
+#define   GBL_SMI_EN	 (1 <<  0) // SMI# generation at all?
+#define SMI_STS		0x34
+#define ALT_GP_SMI_EN	0x38
+#define ALT_GP_SMI_STS	0x3a
+#define GPE_CNTL	0x42
+#define DEVACT_STS	0x44
+#define SS_CNT		0x50
+#define C3_RES		0x54
+
+#define TCOBASE		0x60 /* TCO Base Address Register */
+#define TCO1_CNT	0x08 /* TCO1 Control Register */
+
+#define GEN_PMCON_1		0xa0
+#define GEN_PMCON_2		0xa2
+#define GEN_PMCON_3		0xa4
+
+/* GEN_PMCON_3 bits */
+#define RTC_BATTERY_DEAD	(1 << 2)
+#define RTC_POWER_FAILED	(1 << 1)
+#define SLEEP_AFTER_POWER_FAIL	(1 << 0)
+
+#endif /* I82801DX_H */
diff --git a/src/southbridge/intel/i82801dx/ide.c b/src/southbridge/intel/i82801dx/ide.c
new file mode 100644
index 0000000000..a54e49781e
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/ide.c
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include "chip.h"
+#include "i82801dx.h"
+
+typedef struct southbridge_intel_i82801dx_config config_t;
+
+static void ide_init(struct device *dev)
+{
+	/* Get the chip configuration */
+	config_t *config = dev->chip_info;
+
+	/* Enable IDE devices so the Linux IDE driver will work. */
+	uint16_t ideTimingConfig;
+
+	ideTimingConfig = pci_read_config16(dev, IDE_TIM_PRI);
+	ideTimingConfig &= ~IDE_DECODE_ENABLE;
+	if (!config || config->ide0_enable) {
+		/* Enable primary IDE interface. */
+		ideTimingConfig |= IDE_DECODE_ENABLE;
+		printk(BIOS_DEBUG, "IDE0: Primary IDE interface is enabled\n");
+	} else {
+		printk(BIOS_INFO, "IDE0: Primary IDE interface is disabled\n");
+	}
+	pci_write_config16(dev, IDE_TIM_PRI, ideTimingConfig);
+
+	ideTimingConfig = pci_read_config16(dev, IDE_TIM_SEC);
+	ideTimingConfig &= ~IDE_DECODE_ENABLE;
+	if (!config || config->ide1_enable) {
+		/* Enable secondary IDE interface. */
+		ideTimingConfig |= IDE_DECODE_ENABLE;
+		printk(BIOS_DEBUG, "IDE1: Secondary IDE interface is enabled\n");
+	} else {
+		printk(BIOS_INFO, "IDE1: Secondary IDE interface is disabled\n");
+	}
+	pci_write_config16(dev, IDE_TIM_SEC, ideTimingConfig);
+}
+
+static struct device_operations ide_ops = {
+	.read_resources = pci_dev_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init = ide_init,
+	.enable = i82801dx_enable,
+};
+
+/* 82801DB */
+static const struct pci_driver i82801db_ide __pci_driver = {
+	.ops = &ide_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = 0x24cb,
+};
+
+/* 82801DBM */
+static const struct pci_driver i82801dbm_ide __pci_driver = {
+	.ops = &ide_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = 0x24ca,
+};
diff --git a/src/southbridge/intel/i82801dx/lpc.c b/src/southbridge/intel/i82801dx/lpc.c
new file mode 100644
index 0000000000..1de3766563
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/lpc.c
@@ -0,0 +1,328 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <arch/hpet.h>
+#include <arch/io.h>
+#include <arch/ioapic.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <option.h>
+#include <pc80/mc146818rtc.h>
+#include <pc80/isa-dma.h>
+#include <pc80/i8259.h>
+#include "chip.h"
+#include "i82801dx.h"
+
+#define NMI_OFF 0
+
+typedef struct southbridge_intel_i82801dx_config config_t;
+
+/**
+ * Enable ACPI I/O range.
+ *
+ * @param dev PCI device with ACPI and PM BAR's
+ */
+static void i82801dx_enable_acpi(struct device *dev)
+{
+	/* Set ACPI base address (I/O space). */
+	pci_write_config32(dev, PMBASE, (PMBASE_ADDR | 1));
+
+	/* Enable ACPI I/O range decode and ACPI power management. */
+	pci_write_config8(dev, ACPI_CNTL, ACPI_EN);
+}
+
+/**
+ * Set miscellaneous static southbridge features.
+ *
+ * @param dev PCI device with I/O APIC control registers
+ */
+static void i82801dx_enable_ioapic(struct device *dev)
+{
+	u32 reg32;
+
+	reg32 = pci_read_config32(dev, GEN_CNTL);
+	reg32 |= (1 << 13);	/* Coprocessor error enable (COPR_ERR_EN) */
+	reg32 |= (3 << 7);	/* IOAPIC enable (APIC_EN) */
+	reg32 |= (1 << 2);	/* DMA collection buffer enable (DCB_EN) */
+	reg32 |= (1 << 1);	/* Delayed transaction enable (DTE) */
+	pci_write_config32(dev, GEN_CNTL, reg32);
+	printk(BIOS_DEBUG, "IOAPIC Southbridge enabled %x\n", reg32);
+
+	setup_ioapic(VIO_APIC_VADDR, 0x02);
+
+	ioapic_set_boot_config(VIO_APIC_VADDR, true);
+}
+
+static void i82801dx_enable_serial_irqs(struct device *dev)
+{
+	/* Set packet length and toggle silent mode bit. */
+	pci_write_config8(dev, SERIRQ_CNTL,
+			  (1 << 7) | (1 << 6) | ((21 - 17) << 2) | (0 << 0));
+	pci_write_config8(dev, SERIRQ_CNTL,
+			  (1 << 7) | (0 << 6) | ((21 - 17) << 2) | (0 << 0));
+}
+
+static void i82801dx_pirq_init(struct device *dev)
+{
+	/* Get the chip configuration */
+	config_t *config = dev->chip_info;
+
+	pci_write_config8(dev, PIRQA_ROUT, config->pirqa_routing);
+	pci_write_config8(dev, PIRQB_ROUT, config->pirqb_routing);
+	pci_write_config8(dev, PIRQC_ROUT, config->pirqc_routing);
+	pci_write_config8(dev, PIRQD_ROUT, config->pirqd_routing);
+	pci_write_config8(dev, PIRQE_ROUT, config->pirqe_routing);
+	pci_write_config8(dev, PIRQF_ROUT, config->pirqf_routing);
+	pci_write_config8(dev, PIRQG_ROUT, config->pirqg_routing);
+	pci_write_config8(dev, PIRQH_ROUT, config->pirqh_routing);
+}
+
+static void i82801dx_power_options(struct device *dev)
+{
+	u8 reg8;
+	u16 reg16, pmbase;
+	u32 reg32;
+	const char *state;
+
+	/* Which state do we want to goto after g3 (power restored)?
+	 * 0 == S0 Full On
+	 * 1 == S5 Soft Off
+	 *
+	 * If the option is not existent (Laptops), use MAINBOARD_POWER_ON.
+	 */
+	const unsigned int pwr_on = get_uint_option("power_on_after_fail", MAINBOARD_POWER_ON);
+
+	reg8 = pci_read_config8(dev, GEN_PMCON_3);
+	reg8 &= 0xfe;
+	switch (pwr_on)	{
+	case MAINBOARD_POWER_OFF:
+		reg8 |= 1;
+		state = "off";
+		break;
+	case MAINBOARD_POWER_ON:
+		reg8 &= ~1;
+		state = "on";
+		break;
+	case MAINBOARD_POWER_KEEP:
+		reg8 &= ~1;
+		state = "state keep";
+		break;
+	default:
+		state = "undefined";
+	}
+
+	reg8 &= ~(1 << 3);	/* minimum assertion is 1 to 2 RTCCLK */
+
+	pci_write_config8(dev, GEN_PMCON_3, reg8);
+	printk(BIOS_INFO, "Set power %s after power failure.\n", state);
+
+	/* Set up NMI on errors. */
+	reg8 = inb(0x61);
+	reg8 &= 0x0f;		/* Higher Nibble must be 0 */
+	reg8 &= ~(1 << 3);	/* IOCHK# NMI Enable */
+	// reg8 &= ~(1 << 2);	/* PCI SERR# Enable */
+	reg8 |= (1 << 2); /* PCI SERR# Disable for now */
+	outb(reg8, 0x61);
+
+	reg8 = inb(0x70);
+	const unsigned int nmi_option = get_uint_option("nmi", NMI_OFF);
+	if (nmi_option) {
+		printk(BIOS_INFO, "NMI sources enabled.\n");
+		reg8 &= ~(1 << 7);	/* Set NMI. */
+	} else {
+		printk(BIOS_INFO, "NMI sources disabled.\n");
+		reg8 |= (1 << 7);	/* Disable NMI. */
+	}
+	outb(reg8, 0x70);
+
+	/* Set SMI# rate down and enable CPU_SLP# */
+	reg16 = pci_read_config16(dev, GEN_PMCON_1);
+	reg16 &= ~(3 << 0);	// SMI# rate 1 minute
+	reg16 |= (1 << 5);	// CPUSLP_EN Desktop only
+	pci_write_config16(dev, GEN_PMCON_1, reg16);
+
+	pmbase = pci_read_config16(dev, 0x40) & 0xfffe;
+
+	/* Set up power management block and determine sleep mode */
+	reg32 = inl(pmbase + 0x04); // PM1_CNT
+
+	reg32 &= ~(7 << 10);	// SLP_TYP
+	reg32 |= (1 << 0);	// SCI_EN
+	outl(reg32, pmbase + 0x04);
+}
+
+static void gpio_init(struct device *dev)
+{
+	/* This should be done in romstage.c already */
+	pci_write_config32(dev, GPIO_BASE, (GPIOBASE_ADDR | 1));
+	pci_write_config8(dev, GPIO_CNTL, 0x10);
+}
+
+static void i82801dx_rtc_init(struct device *dev)
+{
+	u8 reg8;
+	u32 reg32;
+	int rtc_failed;
+
+	reg8 = pci_read_config8(dev, GEN_PMCON_3);
+	rtc_failed = reg8 & RTC_BATTERY_DEAD;
+	if (rtc_failed) {
+		reg8 &= ~(1 << 1);	/* Preserve the power fail state. */
+		pci_write_config8(dev, GEN_PMCON_3, reg8);
+	}
+	reg32 = pci_read_config32(dev, GEN_STS);
+	rtc_failed |= reg32 & (1 << 2);
+	cmos_init(rtc_failed);
+
+	/* Enable access to the upper 128 byte bank of CMOS RAM. */
+	pci_write_config8(dev, RTC_CONF, 0x04);
+}
+
+static void i82801dx_lpc_route_dma(struct device *dev, u8 mask)
+{
+	u16 reg16;
+	int i;
+
+	reg16 = pci_read_config16(dev, PCI_DMA_CFG);
+	reg16 &= 0x300;
+	for (i = 0; i < 8; i++) {
+		if (i == 4)
+			continue;
+		reg16 |= ((mask & (1 << i)) ? 3 : 1) << (i * 2);
+	}
+	pci_write_config16(dev, PCI_DMA_CFG, reg16);
+}
+
+static void i82801dx_lpc_decode_en(struct device *dev)
+{
+	/* Decode 0x3F8-0x3FF (COM1) for COMA port, 0x2F8-0x2FF (COM2) for COMB.
+	 * LPT decode defaults to 0x378-0x37F and 0x778-0x77F.
+	 * Floppy decode defaults to 0x3F0-0x3F5, 0x3F7.
+	 * We also need to set the value for LPC I/F Enables Register.
+	 */
+	pci_write_config8(dev, COM_DEC, 0x10);
+	pci_write_config16(dev, LPC_EN, 0x300F);
+}
+
+/* ICH4 does not mention HPET in the docs, but
+ * all ICH3 and ICH4 do have HPETs built in.
+ */
+static void enable_hpet(struct device *dev)
+{
+	u32 reg32, hpet, val;
+
+	/* Set HPET base address and enable it */
+	printk(BIOS_DEBUG, "Enabling HPET at 0x%x\n", HPET_BASE_ADDRESS);
+	reg32 = pci_read_config32(dev, GEN_CNTL);
+	/*
+	 * Bit 17 is HPET enable bit.
+	 * Bit 16:15 control the HPET base address.
+	 */
+	reg32 &= ~(3 << 15);	/* Clear it */
+
+	hpet = HPET_BASE_ADDRESS >> 12;
+	hpet &= 0x3;
+
+	reg32 |= (hpet << 15);
+	reg32 |= (1 << 17);	/* Enable HPET. */
+	pci_write_config32(dev, GEN_CNTL, reg32);
+
+	/* Check to see whether it took */
+	reg32 = pci_read_config32(dev, GEN_CNTL);
+	val = reg32 >> 15;
+	val &= 0x7;
+
+	if ((val & 0x4) && (hpet == (val & 0x3))) {
+		printk(BIOS_INFO, "HPET enabled at 0x%x\n", HPET_BASE_ADDRESS);
+	} else {
+		printk(BIOS_WARNING, "HPET was not enabled correctly\n");
+		reg32 &= ~(1 << 17);	/* Clear Enable */
+		pci_write_config32(dev, GEN_CNTL, reg32);
+	}
+}
+
+static void lpc_init(struct device *dev)
+{
+	i82801dx_enable_acpi(dev);
+	/* IO APIC initialization. */
+	i82801dx_enable_ioapic(dev);
+
+	i82801dx_enable_serial_irqs(dev);
+
+	/* Setup the PIRQ. */
+	i82801dx_pirq_init(dev);
+
+	/* Setup power options. */
+	i82801dx_power_options(dev);
+
+	/* Set the state of the GPIO lines. */
+	gpio_init(dev);
+
+	/* Initialize the real time clock. */
+	i82801dx_rtc_init(dev);
+
+	/* Route DMA. */
+	i82801dx_lpc_route_dma(dev, 0xff);
+
+	/* Initialize ISA DMA. */
+	isa_dma_init();
+
+	/* Setup decode ports and LPC I/F enables. */
+	i82801dx_lpc_decode_en(dev);
+
+	/* Initialize the High Precision Event Timers */
+	enable_hpet(dev);
+
+	setup_i8259();
+}
+
+static void i82801dx_lpc_read_resources(struct device *dev)
+{
+	struct resource *res;
+
+	/* 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 = 0xff800000;
+	res->size = 0x00800000; /* 8 MB for flash */
+	res->flags = IORESOURCE_MEM | IORESOURCE_SUBTRACTIVE |
+		     IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+
+	res = new_resource(dev, 3); /* IOAPIC */
+	res->base = IO_APIC_ADDR;
+	res->size = 0x00001000;
+	res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED | IORESOURCE_FIXED;
+}
+
+static struct device_operations lpc_ops = {
+	.read_resources		= i82801dx_lpc_read_resources,
+	.set_resources		= pci_dev_set_resources,
+	.enable_resources	= pci_dev_enable_resources,
+	.init			= lpc_init,
+	.scan_bus		= scan_static_bus,
+	.enable			= i82801dx_enable,
+};
+
+/* 82801DB/DBL */
+static const struct pci_driver lpc_driver_db __pci_driver = {
+	.ops = &lpc_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = PCI_DID_INTEL_82801DB_LPC,
+};
+
+/* 82801DBM */
+static const struct pci_driver lpc_driver_dbm __pci_driver = {
+	.ops = &lpc_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = PCI_DID_INTEL_82801DBM_LPC,
+};
diff --git a/src/southbridge/intel/i82801dx/usb.c b/src/southbridge/intel/i82801dx/usb.c
new file mode 100644
index 0000000000..16ec3077e9
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/usb.c
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include "i82801dx.h"
+
+static void usb_init(struct device *dev)
+{
+	printk(BIOS_DEBUG, "USB: Setting up controller.. ");
+	pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+			   PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE);
+	printk(BIOS_DEBUG, "done.\n");
+}
+
+static struct device_operations usb_ops = {
+	.read_resources = pci_dev_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init = usb_init,
+	.enable = i82801dx_enable,
+};
+
+/* 82801DB/DBL/DBM USB1 */
+static const struct pci_driver usb_driver_1 __pci_driver = {
+	.ops = &usb_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = PCI_DID_INTEL_82801DB_USB1,
+};
+
+/* 82801DB/DBL/DBM USB2 */
+static const struct pci_driver usb_driver_2 __pci_driver = {
+	.ops = &usb_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = PCI_DID_INTEL_82801DB_USB2,
+};
+
+/* 82801DB/DBL/DBM USB3 */
+static const struct pci_driver usb_driver_3 __pci_driver = {
+	.ops = &usb_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = PCI_DID_INTEL_82801DB_USB3,
+};
diff --git a/src/southbridge/intel/i82801dx/usb2.c b/src/southbridge/intel/i82801dx/usb2.c
new file mode 100644
index 0000000000..0fe7c9399b
--- /dev/null
+++ b/src/southbridge/intel/i82801dx/usb2.c
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <device/pci_ehci.h>
+#include "i82801dx.h"
+
+static void usb2_init(struct device *dev)
+{
+	printk(BIOS_DEBUG, "USB: Setting up controller.. ");
+	pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
+			   PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE);
+	printk(BIOS_DEBUG, "done.\n");
+}
+
+static struct device_operations usb2_ops = {
+	.read_resources = pci_ehci_read_resources,
+	.set_resources = pci_dev_set_resources,
+	.enable_resources = pci_dev_enable_resources,
+	.init = usb2_init,
+	.enable = i82801dx_enable,
+};
+
+/* 82801DB/DBM USB 2.0 */
+static const struct pci_driver usb2_driver __pci_driver = {
+	.ops = &usb2_ops,
+	.vendor = PCI_VID_INTEL,
+	.device = PCI_DID_INTEL_82801DB_EHCI,
+};