mb/lenovo/x220: Add x1 as a variant

ThinkPad X1 ( https://www.thinkwiki.org/wiki/Category:X1 ) is nearly a
clone of X220, with additional USB3 controller on pci-e (as i7 variant
of x220), and a powered ESATA port wired to ata4 (Linux' annotation).

Documentation added.

Tested:
- CPU i5-2520M
- Slotted DIMM 8GiB
- Camera
- Mini pci-e on wlan slot
- Msata on wwan slot
- On board SDHCI connected to pci-e
- USB3 controller connected to pci-e
- NVRAM options for North and South bridges
- S3
- TPM1 on LPC
- Linux 4.9.110-3 within Debian GNU/Linux stable, loaded from
  SeaBIOS, or Linux payload (Heads)

Not tested:
- Fingerprint reader on USB2
- Onboard USB2 interfaces (wlan slot, wwan slot)

Change-Id: Ibbc45f22c63b77ac95c188db825d0d7e2b03d2d1
Signed-off-by: Bill XIE <persmule@gmail.com>
Reviewed-on: https://review.coreboot.org/c/29434
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

13 files changed, 411 insertions, 24 deletions

diff --git a/src/mainboard/lenovo/x220/Kconfig b/src/mainboard/lenovo/x220/Kconfig
index 0f7cbe7bee..f8f7055de8 100644
--- a/src/mainboard/lenovo/x220/Kconfig
+++ b/src/mainboard/lenovo/x220/Kconfig
@@ -1,4 +1,4 @@
-if BOARD_LENOVO_X220 || BOARD_LENOVO_X220I
+if BOARD_LENOVO_X220 || BOARD_LENOVO_X220I || BOARD_LENOVO_X1
 
 config BOARD_SPECIFIC_OPTIONS
 	def_bool y
@@ -29,9 +29,21 @@ config MAINBOARD_DIR
 	string
 	default lenovo/x220
 
+config VARIANT_DIR
+	string
+	default "x220" if BOARD_LENOVO_X220 || BOARD_LENOVO_X220I
+	default "x1" if BOARD_LENOVO_X1
+
+
 config MAINBOARD_PART_NUMBER
 	string
-	default "ThinkPad X220"
+	default "ThinkPad X220" if BOARD_LENOVO_X220
+	default "ThinkPad X220i" if BOARD_LENOVO_X220I
+	default "ThinkPad X1" if BOARD_LENOVO_X1
+
+config OVERRIDE_DEVICETREE
+	string
+	default "variants/$(CONFIG_VARIANT_DIR)/overridetree.cb"
 
 config MAX_CPUS
 	int
@@ -48,6 +60,7 @@ config DRAM_RESET_GATE_GPIO
 config VGA_BIOS_FILE
 	string
 	default "pci8086,0116.rom" if BOARD_LENOVO_X220I
+	# FIXME: x1 with i3 cpu may also use "pci8086,0116.rom"
 	default "pci8086,0126.rom"
 
 config VGA_BIOS_ID
@@ -61,6 +74,7 @@ config MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID
 
 config MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID
 	hex
-	default 0x21db
+	default 0x21db if BOARD_LENOVO_X220 || BOARD_LENOVO_X220I
+	default 0x21e8 if BOARD_LENOVO_X1
 
-endif # BOARD_LENOVO_X220 || BOARD_LENOVO_X220I
+endif # BOARD_LENOVO_X220 || BOARD_LENOVO_X220I || BOARD_LENOVO_X1
diff --git a/src/mainboard/lenovo/x220/Kconfig.name b/src/mainboard/lenovo/x220/Kconfig.name
index 0f9d3fcfb7..988ac4fb55 100644
--- a/src/mainboard/lenovo/x220/Kconfig.name
+++ b/src/mainboard/lenovo/x220/Kconfig.name
@@ -3,3 +3,6 @@ config BOARD_LENOVO_X220
 
 config BOARD_LENOVO_X220I
 	bool "ThinkPad X220i"
+
+config BOARD_LENOVO_X1
+	bool "ThinkPad X1"
diff --git a/src/mainboard/lenovo/x220/Makefile.inc b/src/mainboard/lenovo/x220/Makefile.inc
index 2dab9507f1..2c52c21d33 100644
--- a/src/mainboard/lenovo/x220/Makefile.inc
+++ b/src/mainboard/lenovo/x220/Makefile.inc
@@ -14,6 +14,7 @@
 ##
 
 smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
-romstage-y += gpio.c
+romstage-y += variants/$(VARIANT_DIR)/gpio.c
+romstage-y += variants/$(VARIANT_DIR)/romstage.c
 
 ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
diff --git a/src/mainboard/lenovo/x220/devicetree.cb b/src/mainboard/lenovo/x220/devicetree.cb
index 969ae3857b..2a1507cd9a 100644
--- a/src/mainboard/lenovo/x220/devicetree.cb
+++ b/src/mainboard/lenovo/x220/devicetree.cb
@@ -159,8 +159,6 @@ chip northbridge/intel/sandybridge
 					register "event7_enable" = "0x81"
 					register "event8_enable" = "0x7b"
 					register "event9_enable" = "0xff"
-					register "eventa_enable" = "0x01"
-					register "eventb_enable" = "0xf0"
 					register "eventc_enable" = "0xff"
 					register "eventd_enable" = "0xff"
 					register "evente_enable" = "0x0d"
diff --git a/src/mainboard/lenovo/x220/romstage.c b/src/mainboard/lenovo/x220/romstage.c
index 3429aad6b6..62b887e688 100644
--- a/src/mainboard/lenovo/x220/romstage.c
+++ b/src/mainboard/lenovo/x220/romstage.c
@@ -98,23 +98,6 @@ void mainboard_fill_pei_data(struct pei_data *pei_data)
 	*pei_data = pei_data_template;
 }
 
-const struct southbridge_usb_port mainboard_usb_ports[] = {
-	{ 1, 0, 0 },
-	{ 1, 1, 1 },
-	{ 1, 1, 3 },
-	{ 1, 1, 3 },
-	{ 1, 1, -1 },
-	{ 1, 1, -1 },
-	{ 1, 0, 2 },
-	{ 1, 0, 2 },
-	{ 1, 1, 6 },
-	{ 1, 1, 5 },
-	{ 1, 1, 6 },
-	{ 1, 1, 6 },
-	{ 1, 1, 7 },
-	{ 1, 1, 6 },
-};
-
 void mainboard_get_spd(spd_raw_data *spd, bool id_only)
 {
 	read_spd (&spd[0], 0x50, id_only);
diff --git a/src/mainboard/lenovo/x220/variants/x1/data.vbt b/src/mainboard/lenovo/x220/variants/x1/data.vbt
new file mode 100644
index 0000000000..63350f1ec5
--- /dev/null
+++ b/src/mainboard/lenovo/x220/variants/x1/data.vbt
diff --git a/src/mainboard/lenovo/x220/variants/x1/gpio.c b/src/mainboard/lenovo/x220/variants/x1/gpio.c
new file mode 100644
index 0000000000..023f3f3f9d
--- /dev/null
+++ b/src/mainboard/lenovo/x220/variants/x1/gpio.c
@@ -0,0 +1,221 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Vladimir Serbinenko
+ * Copyright (C) 2018 Bill Xie
+ *
+ * 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 <southbridge/intel/common/gpio.h>
+
+static const struct pch_gpio_set1 pch_gpio_set1_mode = {
+	.gpio0 = GPIO_MODE_GPIO,
+	.gpio1 = GPIO_MODE_GPIO,
+	.gpio2 = GPIO_MODE_GPIO,
+	.gpio3 = GPIO_MODE_GPIO,
+	.gpio4 = GPIO_MODE_GPIO,
+	.gpio5 = GPIO_MODE_GPIO,
+	.gpio6 = GPIO_MODE_GPIO,
+	.gpio7 = GPIO_MODE_GPIO,
+	.gpio8 = GPIO_MODE_GPIO,
+	.gpio9 = GPIO_MODE_NATIVE,
+	.gpio10 = GPIO_MODE_GPIO,
+	.gpio11 = GPIO_MODE_NATIVE,
+	.gpio12 = GPIO_MODE_NATIVE,
+	.gpio13 = GPIO_MODE_GPIO,
+	.gpio14 = GPIO_MODE_NATIVE,
+	.gpio15 = GPIO_MODE_GPIO,
+	.gpio16 = GPIO_MODE_NATIVE,
+	.gpio17 = GPIO_MODE_GPIO,
+	.gpio18 = GPIO_MODE_NATIVE,
+	.gpio19 = GPIO_MODE_NATIVE,
+	.gpio20 = GPIO_MODE_NATIVE,
+	.gpio21 = GPIO_MODE_GPIO,
+	.gpio22 = GPIO_MODE_GPIO,
+	.gpio23 = GPIO_MODE_NATIVE,
+	.gpio24 = GPIO_MODE_GPIO,
+	.gpio25 = GPIO_MODE_GPIO,
+	.gpio26 = GPIO_MODE_NATIVE,
+	.gpio27 = GPIO_MODE_GPIO,
+	.gpio28 = GPIO_MODE_GPIO,
+	.gpio29 = GPIO_MODE_GPIO,
+	.gpio30 = GPIO_MODE_NATIVE,
+	.gpio31 = GPIO_MODE_GPIO,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_direction = {
+	.gpio0 = GPIO_DIR_INPUT,
+	.gpio1 = GPIO_DIR_INPUT,
+	.gpio2 = GPIO_DIR_INPUT,
+	.gpio3 = GPIO_DIR_INPUT,
+	.gpio4 = GPIO_DIR_INPUT,
+	.gpio5 = GPIO_DIR_INPUT,
+	.gpio6 = GPIO_DIR_INPUT,
+	.gpio7 = GPIO_DIR_INPUT,
+	.gpio8 = GPIO_DIR_OUTPUT,
+	.gpio10 = GPIO_DIR_OUTPUT,
+	.gpio13 = GPIO_DIR_INPUT,
+	.gpio15 = GPIO_DIR_OUTPUT,
+	.gpio17 = GPIO_DIR_INPUT,
+	.gpio21 = GPIO_DIR_INPUT,
+	.gpio22 = GPIO_DIR_OUTPUT,
+	.gpio24 = GPIO_DIR_OUTPUT,
+	.gpio25 = GPIO_DIR_INPUT,
+	.gpio27 = GPIO_DIR_INPUT,
+	.gpio28 = GPIO_DIR_OUTPUT,
+	.gpio29 = GPIO_DIR_OUTPUT,
+	.gpio31 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_level = {
+	.gpio8 = GPIO_LEVEL_HIGH,
+	.gpio10 = GPIO_LEVEL_HIGH,
+	.gpio15 = GPIO_LEVEL_LOW,
+	.gpio22 = GPIO_LEVEL_HIGH,
+	.gpio24 = GPIO_LEVEL_LOW,
+	.gpio28 = GPIO_LEVEL_LOW,
+	.gpio29 = GPIO_LEVEL_HIGH,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_reset = {
+	.gpio24 = GPIO_RESET_RSMRST,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_invert = {
+	.gpio0 = GPIO_INVERT,
+	.gpio1 = GPIO_INVERT,
+	.gpio6 = GPIO_INVERT,
+	.gpio7 = GPIO_INVERT,
+	.gpio13 = GPIO_INVERT,
+};
+
+static const struct pch_gpio_set1 pch_gpio_set1_blink = {
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_mode = {
+	.gpio32 = GPIO_MODE_NATIVE,
+	.gpio33 = GPIO_MODE_GPIO,
+	.gpio34 = GPIO_MODE_GPIO,
+	.gpio35 = GPIO_MODE_GPIO,
+	.gpio36 = GPIO_MODE_GPIO,
+	.gpio37 = GPIO_MODE_NATIVE,
+	.gpio38 = GPIO_MODE_GPIO,
+	.gpio39 = GPIO_MODE_GPIO,
+	.gpio40 = GPIO_MODE_NATIVE,
+	.gpio41 = GPIO_MODE_NATIVE,
+	.gpio42 = GPIO_MODE_GPIO,
+	.gpio43 = GPIO_MODE_NATIVE,
+	.gpio44 = GPIO_MODE_NATIVE,
+	.gpio45 = GPIO_MODE_NATIVE,
+	.gpio46 = GPIO_MODE_NATIVE,
+	.gpio47 = GPIO_MODE_NATIVE,
+	.gpio48 = GPIO_MODE_GPIO,
+	.gpio49 = GPIO_MODE_GPIO,
+	.gpio50 = GPIO_MODE_GPIO,
+	.gpio51 = GPIO_MODE_GPIO,
+	.gpio52 = GPIO_MODE_GPIO,
+	.gpio53 = GPIO_MODE_GPIO,
+	.gpio54 = GPIO_MODE_GPIO,
+	.gpio55 = GPIO_MODE_GPIO,
+	.gpio56 = GPIO_MODE_NATIVE,
+	.gpio57 = GPIO_MODE_GPIO,
+	.gpio58 = GPIO_MODE_NATIVE,
+	.gpio59 = GPIO_MODE_NATIVE,
+	.gpio60 = GPIO_MODE_NATIVE,
+	.gpio61 = GPIO_MODE_NATIVE,
+	.gpio62 = GPIO_MODE_NATIVE,
+	.gpio63 = GPIO_MODE_NATIVE,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_direction = {
+	.gpio33 = GPIO_DIR_OUTPUT,
+	.gpio34 = GPIO_DIR_INPUT,
+	.gpio35 = GPIO_DIR_OUTPUT,
+	.gpio36 = GPIO_DIR_INPUT,
+	.gpio38 = GPIO_DIR_INPUT,
+	.gpio39 = GPIO_DIR_INPUT,
+	.gpio42 = GPIO_DIR_OUTPUT,
+	.gpio48 = GPIO_DIR_INPUT,
+	.gpio49 = GPIO_DIR_INPUT,
+	.gpio50 = GPIO_DIR_INPUT,
+	.gpio51 = GPIO_DIR_OUTPUT,
+	.gpio52 = GPIO_DIR_OUTPUT,
+	.gpio53 = GPIO_DIR_OUTPUT,
+	.gpio54 = GPIO_DIR_INPUT,
+	.gpio55 = GPIO_DIR_OUTPUT,
+	.gpio57 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_level = {
+	.gpio33 = GPIO_LEVEL_HIGH,
+	.gpio35 = GPIO_LEVEL_LOW,
+	.gpio42 = GPIO_LEVEL_HIGH,
+	.gpio51 = GPIO_LEVEL_HIGH,
+	.gpio52 = GPIO_LEVEL_HIGH,
+	.gpio53 = GPIO_LEVEL_HIGH,
+	.gpio55 = GPIO_LEVEL_HIGH,
+};
+
+static const struct pch_gpio_set2 pch_gpio_set2_reset = {
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_mode = {
+	.gpio64 = GPIO_MODE_NATIVE,
+	.gpio65 = GPIO_MODE_NATIVE,
+	.gpio66 = GPIO_MODE_NATIVE,
+	.gpio67 = GPIO_MODE_NATIVE,
+	.gpio68 = GPIO_MODE_GPIO,
+	.gpio69 = GPIO_MODE_GPIO,
+	.gpio70 = GPIO_MODE_GPIO,
+	.gpio71 = GPIO_MODE_GPIO,
+	.gpio72 = GPIO_MODE_NATIVE,
+	.gpio73 = GPIO_MODE_NATIVE,
+	.gpio74 = GPIO_MODE_NATIVE,
+	.gpio75 = GPIO_MODE_NATIVE,
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_direction = {
+	.gpio68 = GPIO_DIR_INPUT,
+	.gpio69 = GPIO_DIR_INPUT,
+	.gpio70 = GPIO_DIR_INPUT,
+	.gpio71 = GPIO_DIR_INPUT,
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_level = {
+};
+
+static const struct pch_gpio_set3 pch_gpio_set3_reset = {
+};
+
+const struct pch_gpio_map mainboard_gpio_map = {
+	.set1 = {
+		.mode		= &pch_gpio_set1_mode,
+		.direction	= &pch_gpio_set1_direction,
+		.level		= &pch_gpio_set1_level,
+		.blink		= &pch_gpio_set1_blink,
+		.invert		= &pch_gpio_set1_invert,
+		.reset		= &pch_gpio_set1_reset,
+	},
+	.set2 = {
+		.mode		= &pch_gpio_set2_mode,
+		.direction	= &pch_gpio_set2_direction,
+		.level		= &pch_gpio_set2_level,
+		.reset		= &pch_gpio_set2_reset,
+	},
+	.set3 = {
+		.mode		= &pch_gpio_set3_mode,
+		.direction	= &pch_gpio_set3_direction,
+		.level		= &pch_gpio_set3_level,
+		.reset		= &pch_gpio_set3_reset,
+	},
+};
diff --git a/src/mainboard/lenovo/x220/variants/x1/overridetree.cb b/src/mainboard/lenovo/x220/variants/x1/overridetree.cb
new file mode 100644
index 0000000000..54f6485d25
--- /dev/null
+++ b/src/mainboard/lenovo/x220/variants/x1/overridetree.cb
@@ -0,0 +1,85 @@
+chip northbridge/intel/sandybridge
+
+	register "gpu_dp_b_hotplug" = "0x04"
+	register "gpu_dp_c_hotplug" = "0x04"
+	register "gpu_dp_d_hotplug" = "0x04"
+	register "gpu_panel_power_cycle_delay" = "3"
+	register "gpu_panel_power_up_delay" = "250"		# T1+T2: 25ms
+	register "gpu_panel_power_down_delay" = "250"		# T5+T6: 35ms
+	register "gpu_panel_power_backlight_on_delay" = "2500"	# T3: 250ms
+	register "gpu_panel_power_backlight_off_delay" = "2500"	# T4: 250ms
+
+	register "gpu_cpu_backlight" = "0x1312"
+	register "gpu_pch_backlight" = "0x13121312"
+
+	device domain 0 on
+		device pci 00.0 on
+			subsystemid 0x17aa 0x21e8
+		end # host bridge
+		device pci 02.0 on
+			subsystemid 0x17aa 0x21e8
+		end # vga controller
+
+		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
+			# Enable SATA ports 0 (HDD bay) & 2 (msata) & 3 (esatap)
+			register "sata_port_map" = "0x1d"
+			# X1 does not have ExpressCard slot
+			register "pcie_hotplug_map" = "{ 0, 0, 0, 0, 0, 0, 0, 0 }"
+
+			device pci 1a.0 on
+				subsystemid 0x17aa 0x21e8
+			end # USB2 EHCI #2
+			device pci 1b.0 on
+				subsystemid 0x17aa 0x21e8
+			end # High Definition Audio
+			device pci 1c.0 off end # PCIe Port #1
+			device pci 1c.1 on
+				subsystemid 0x17aa 0x21e8
+			end # PCIe Port #2 (wlan)
+			device pci 1c.2 off end # PCIe Port #3
+			device pci 1c.3 off end # PCIe Port #4
+			device pci 1c.4 on
+				subsystemid 0x17aa 0x21e8
+				chip drivers/ricoh/rce822 # Ricoh cardreader
+					device pci 00.0 on
+						subsystemid 0x17aa 0x21e8
+					end
+				end
+			end # PCIe Port #5 (SD)
+			device pci 1c.5 off end # PCIe Port #6
+			device pci 1c.6 on
+				subsystemid 0x17aa 0x21e8
+			end # PCIe Port #7
+			device pci 1c.7 off end # PCIe Port #8
+			device pci 1d.0 on
+				subsystemid 0x17aa 0x21e8
+			end # USB2 EHCI #1
+			device pci 1e.0 off end # PCI bridge
+			device pci 1f.0 on #LPC bridge
+				subsystemid 0x17aa 0x21e8
+				chip ec/lenovo/h8
+					register "config2" = "0xe0"
+					register "config3" = "0xc0"
+
+					register "beepmask0" = "0xfe"
+					register "beepmask1" = "0x96"
+
+					register "event5_enable" = "0x3c"
+					register "evente_enable" = "0x3d"
+
+					# BDC detection is broken on this board:
+					register "has_bdc_detection" = "0"
+				end
+			end # LPC bridge
+			device pci 1f.2 on
+				subsystemid 0x17aa 0x21e8
+			end # SATA Controller 1
+			device pci 1f.3 on
+				subsystemid 0x17aa 0x21e8
+			end # SMBus
+			device pci 1f.6 on
+				subsystemid 0x17aa 0x21e8
+			end # Thermal
+		end
+	end
+end
diff --git a/src/mainboard/lenovo/x220/variants/x1/romstage.c b/src/mainboard/lenovo/x220/variants/x1/romstage.c
new file mode 100644
index 0000000000..a1932cc8e2
--- /dev/null
+++ b/src/mainboard/lenovo/x220/variants/x1/romstage.c
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2010 coresystems GmbH
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 <southbridge/intel/bd82x6x/pch.h>
+
+const struct southbridge_usb_port mainboard_usb_ports[] = {
+	{ 1, 1, 0 },
+	{ 1, 1, 1 },
+	{ 1, 1, 3 },
+	{ 1, 0, 3 },
+	{ 1, 0, 3 },
+	{ 1, 1, 3 },
+	{ 0, 0, 3 },
+	{ 0, 0, 3 },
+	{ 1, 1, 4 },
+	{ 1, 1, 5 },
+	{ 1, 0, 7 },
+	{ 1, 1, 7 },
+	{ 1, 1, 7 },
+	{ 1, 0, 7 },
+};
diff --git a/src/mainboard/lenovo/x220/data.vbt b/src/mainboard/lenovo/x220/variants/x220/data.vbt
index 2b5bc1e2d0..2b5bc1e2d0 100644
--- a/src/mainboard/lenovo/x220/data.vbt
+++ b/src/mainboard/lenovo/x220/variants/x220/data.vbt
diff --git a/src/mainboard/lenovo/x220/gpio.c b/src/mainboard/lenovo/x220/variants/x220/gpio.c
index b1499d1f83..b1499d1f83 100644
--- a/src/mainboard/lenovo/x220/gpio.c
+++ b/src/mainboard/lenovo/x220/variants/x220/gpio.c
diff --git a/src/mainboard/lenovo/x220/variants/x220/overridetree.cb b/src/mainboard/lenovo/x220/variants/x220/overridetree.cb
new file mode 100644
index 0000000000..604eadf2a9
--- /dev/null
+++ b/src/mainboard/lenovo/x220/variants/x220/overridetree.cb
@@ -0,0 +1,12 @@
+chip northbridge/intel/sandybridge
+	device domain 0 on
+		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
+			device pci 1f.0 on #LPC bridge
+				chip ec/lenovo/h8
+					register "eventa_enable" = "0x01"
+					register "eventb_enable" = "0xf0"
+				end
+			end # LPC bridge
+		end
+	end
+end
diff --git a/src/mainboard/lenovo/x220/variants/x220/romstage.c b/src/mainboard/lenovo/x220/variants/x220/romstage.c
new file mode 100644
index 0000000000..88a93961df
--- /dev/null
+++ b/src/mainboard/lenovo/x220/variants/x220/romstage.c
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2010 coresystems GmbH
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ * Copyright (C) 2014 Vladimir Serbinenko
+ *
+ * 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 <southbridge/intel/bd82x6x/pch.h>
+
+const struct southbridge_usb_port mainboard_usb_ports[] = {
+	{ 1, 0, 0 },
+	{ 1, 1, 1 },
+	{ 1, 1, 3 },
+	{ 1, 1, 3 },
+	{ 1, 1, -1 },
+	{ 1, 1, -1 },
+	{ 1, 0, 2 },
+	{ 1, 0, 2 },
+	{ 1, 1, 6 },
+	{ 1, 1, 5 },
+	{ 1, 1, 6 },
+	{ 1, 1, 6 },
+	{ 1, 1, 7 },
+	{ 1, 1, 6 },
+};