lenovo/t420s: Add new port.

This is based on x220 and t520. Tested on i7 model with usb3.
There is no support for nvidia gpu and optimus.

Change-Id: I6ca9436ccec3024095d02078e5e450147841e463
Signed-off-by: Nicolas Reinecke <nr@das-labor.org>
Reviewed-on: http://review.coreboot.org/7974
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Philipp Deppenwiese <zaolin@das-labor.org>
Reviewed-by: Peter Stuge <peter@stuge.se>

18 files changed, 1435 insertions, 0 deletions

diff --git a/src/mainboard/lenovo/Kconfig b/src/mainboard/lenovo/Kconfig
index 2f1fac7907..30b1d36ff2 100644
--- a/src/mainboard/lenovo/Kconfig
+++ b/src/mainboard/lenovo/Kconfig
@@ -32,6 +32,11 @@ config BOARD_LENOVO_X230
 	help
 	  Lenovo X230 laptop. Consult wiki for details.
 
+config BOARD_LENOVO_T420S
+	bool "ThinkPad T420s"
+	help
+	  Lenovo T420s laptop. Consult wiki for details.
+
 config BOARD_LENOVO_T520
 	bool "ThinkPad T520"
 	help
@@ -62,6 +67,7 @@ source "src/mainboard/lenovo/x200/Kconfig"
 source "src/mainboard/lenovo/x201/Kconfig"
 source "src/mainboard/lenovo/x220/Kconfig"
 source "src/mainboard/lenovo/x230/Kconfig"
+source "src/mainboard/lenovo/t420s/Kconfig"
 source "src/mainboard/lenovo/t520/Kconfig"
 source "src/mainboard/lenovo/t530/Kconfig"
 source "src/mainboard/lenovo/t60/Kconfig"
diff --git a/src/mainboard/lenovo/t420s/Kconfig b/src/mainboard/lenovo/t420s/Kconfig
new file mode 100644
index 0000000000..72605d1eda
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/Kconfig
@@ -0,0 +1,74 @@
+if BOARD_LENOVO_T420S
+
+config BOARD_SPECIFIC_OPTIONS # dummy
+	def_bool y
+	select SYSTEM_TYPE_LAPTOP
+	select CPU_INTEL_SOCKET_RPGA988B
+	select NORTHBRIDGE_INTEL_SANDYBRIDGE_NATIVE
+	select SOUTHBRIDGE_INTEL_BD82X6X
+	select EC_LENOVO_PMH7
+	select EC_LENOVO_H8
+	select BOARD_ROMSIZE_KB_8192
+	select HAVE_ACPI_TABLES
+	select HAVE_OPTION_TABLE
+	select HAVE_CMOS_DEFAULT
+	select HAVE_ACPI_RESUME
+	select INTEL_INT15
+	select VGA
+	select INTEL_EDID
+	select MAINBOARD_HAS_NATIVE_VGA_INIT
+	select MAINBOARD_HAS_NATIVE_VGA_INIT_TEXTMODECFG
+	select SANDYBRIDGE_LVDS
+
+	# Workaround for EC/KBC IRQ1.
+	select SERIRQ_CONTINUOUS_MODE
+
+config HAVE_IFD_BIN
+	bool
+	default n
+
+config HAVE_ME_BIN
+	bool
+	default n
+
+config MAINBOARD_DIR
+	string
+	default lenovo/t420s
+
+config MAINBOARD_PART_NUMBER
+	string
+	default "ThinkPad T420s"
+
+config MMCONF_BASE_ADDRESS
+	hex
+	default 0xf0000000
+
+config MAX_CPUS
+	int
+	default 8
+
+config USBDEBUG_HCD_INDEX
+	int
+	default 2
+
+config DRAM_RESET_GATE_GPIO
+	int
+	default 10
+
+config VGA_BIOS_FILE
+	string
+	default "pci8086,0126.rom"
+
+config VGA_BIOS_ID
+	string
+	default "8086,0126"
+
+config MAINBOARD_PCI_SUBSYSTEM_VENDOR_ID
+	hex
+	default 0x17aa
+
+config MAINBOARD_PCI_SUBSYSTEM_DEVICE_ID
+	hex
+	default 0x21d2
+
+endif # BOARD_LENOVO_T420S
diff --git a/src/mainboard/lenovo/t420s/Makefile.inc b/src/mainboard/lenovo/t420s/Makefile.inc
new file mode 100644
index 0000000000..265059ae9f
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/Makefile.inc
@@ -0,0 +1,21 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+##
+## 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.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+smm-$(CONFIG_HAVE_SMI_HANDLER) += smihandler.c
+romstage-y += gpio.c
diff --git a/src/mainboard/lenovo/t420s/acpi/ec.asl b/src/mainboard/lenovo/t420s/acpi/ec.asl
new file mode 100644
index 0000000000..4b3e72cb03
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/acpi/ec.asl
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (c) 2011 Sven Schnelle <svens@stackframe.org>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <ec/lenovo/h8/acpi/ec.asl>
+
+Scope(\_SB.PCI0.LPCB.EC)
+{
+}
diff --git a/src/mainboard/lenovo/t420s/acpi/platform.asl b/src/mainboard/lenovo/t420s/acpi/platform.asl
new file mode 100644
index 0000000000..f937dc552a
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/acpi/platform.asl
@@ -0,0 +1,77 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011-2012 The Chromium OS Authors. All rights reserved.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/* The APM port can be used for generating software SMIs */
+
+OperationRegion (APMP, SystemIO, 0xb2, 2)
+Field (APMP, ByteAcc, NoLock, Preserve)
+{
+	APMC, 8,	// APM command
+	APMS, 8		// APM status
+}
+
+/* Port 80 POST */
+
+OperationRegion (POST, SystemIO, 0x80, 1)
+Field (POST, ByteAcc, Lock, Preserve)
+{
+	DBG0, 8
+}
+
+/* SMI I/O Trap */
+Method(TRAP, 1, Serialized)
+{
+	Store (Arg0, SMIF)	// SMI Function
+	Store (0, TRP0)		// Generate trap
+	Return (SMIF)		// Return value of SMI handler
+}
+
+/* The _PIC method is called by the OS to choose between interrupt
+ * routing via the i8259 interrupt controller or the APIC.
+ *
+ * _PIC is called with a parameter of 0 for i8259 configuration and
+ * with a parameter of 1 for Local Apic/IOAPIC configuration.
+ */
+
+Method(_PIC, 1)
+{
+	// Remember the OS' IRQ routing choice.
+	Store(Arg0, PICM)
+}
+
+/* The _PTS method (Prepare To Sleep) is called before the OS is
+ * entering a sleep state. The sleep state number is passed in Arg0
+ */
+
+Method(_PTS,1)
+{
+
+}
+
+/* The _WAK method is called on system wakeup */
+
+Method(_WAK,1)
+{
+	/* ME may not be up yet. */
+	Store (0, \_TZ.MEB1)
+	Store (0, \_TZ.MEB2)
+
+	/* Not implemented. */
+	Return(Package(){0,0})
+}
diff --git a/src/mainboard/lenovo/t420s/acpi/superio.asl b/src/mainboard/lenovo/t420s/acpi/superio.asl
new file mode 100644
index 0000000000..03b65bc816
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/acpi/superio.asl
@@ -0,0 +1 @@
+#include <drivers/pc80/ps2_controller.asl>
diff --git a/src/mainboard/lenovo/t420s/acpi_tables.c b/src/mainboard/lenovo/t420s/acpi_tables.c
new file mode 100644
index 0000000000..15b9d9a4e4
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/acpi_tables.c
@@ -0,0 +1,78 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <types.h>
+#include <string.h>
+#include <cbmem.h>
+#include <console/console.h>
+#include <arch/acpi.h>
+#include <arch/ioapic.h>
+#include <arch/acpigen.h>
+#include <arch/smp/mpspec.h>
+#include <device/device.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <cpu/cpu.h>
+#include <cpu/x86/msr.h>
+
+#include <southbridge/intel/bd82x6x/pch.h>
+#include <southbridge/intel/bd82x6x/nvs.h>
+#include "thermal.h"
+
+static void acpi_update_thermal_table(global_nvs_t *gnvs)
+{
+	gnvs->tcrt = CRITICAL_TEMPERATURE;
+	gnvs->tpsv = PASSIVE_TEMPERATURE;
+}
+
+void acpi_create_gnvs(global_nvs_t *gnvs)
+{
+	/* Disable USB ports in S3 by default */
+	gnvs->s3u0 = 0;
+	gnvs->s3u1 = 0;
+
+	/* Disable USB ports in S5 by default */
+	gnvs->s5u0 = 0;
+	gnvs->s5u1 = 0;
+
+	/* IGD Displays */
+	gnvs->ndid = 3;
+	gnvs->did[0] = 0x80000100;
+	gnvs->did[1] = 0x80000240;
+	gnvs->did[2] = 0x80000410;
+	gnvs->did[3] = 0x80000410;
+	gnvs->did[4] = 0x00000005;
+
+	// the lid is open by default.
+	gnvs->lids = 1;
+
+	acpi_update_thermal_table(gnvs);
+}
+
+unsigned long acpi_fill_slit(unsigned long current)
+{
+	// Not implemented
+	return current;
+}
+
+unsigned long acpi_fill_srat(unsigned long current)
+{
+	/* No NUMA, no SRAT */
+	return current;
+}
diff --git a/src/mainboard/lenovo/t420s/board_info.txt b/src/mainboard/lenovo/t420s/board_info.txt
new file mode 100644
index 0000000000..689ca8f00c
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/board_info.txt
@@ -0,0 +1,5 @@
+Category: laptop
+ROM package: SOIC-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: n
diff --git a/src/mainboard/lenovo/t420s/cmos.default b/src/mainboard/lenovo/t420s/cmos.default
new file mode 100644
index 0000000000..cf017261e7
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/cmos.default
@@ -0,0 +1,17 @@
+boot_option=Fallback
+last_boot=Fallback
+baud_rate=115200
+debug_level=Spew
+power_on_after_fail=Enable
+nmi=Enable
+volume=0x3
+first_battery=Primary
+bluetooth=Enable
+wwan=Enable
+wlan=Enable
+touchpad=Enable
+sata_mode=AHCI
+fn_ctrl_swap=Disable
+sticky_fn=Disable
+trackpoint=Enable
+hyper_threading=Enable
\ No newline at end of file
diff --git a/src/mainboard/lenovo/t420s/cmos.layout b/src/mainboard/lenovo/t420s/cmos.layout
new file mode 100644
index 0000000000..f92aaf4df7
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/cmos.layout
@@ -0,0 +1,167 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2007-2008 coresystems GmbH
+## 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.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; if not, write to the Free Software
+## Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+##
+
+# -----------------------------------------------------------------
+entries
+
+#start-bit length  config config-ID    name
+#0            8       r       0        seconds
+#8            8       r       0        alarm_seconds
+#16           8       r       0        minutes
+#24           8       r       0        alarm_minutes
+#32           8       r       0        hours
+#40           8       r       0        alarm_hours
+#48           8       r       0        day_of_week
+#56           8       r       0        day_of_month
+#64           8       r       0        month
+#72           8       r       0        year
+# -----------------------------------------------------------------
+# Status Register A
+#80           4       r       0        rate_select
+#84           3       r       0        REF_Clock
+#87           1       r       0        UIP
+# -----------------------------------------------------------------
+# Status Register B
+#88           1       r       0        auto_switch_DST
+#89           1       r       0        24_hour_mode
+#90           1       r       0        binary_values_enable
+#91           1       r       0        square-wave_out_enable
+#92           1       r       0        update_finished_enable
+#93           1       r       0        alarm_interrupt_enable
+#94           1       r       0        periodic_interrupt_enable
+#95           1       r       0        disable_clock_updates
+# -----------------------------------------------------------------
+# Status Register C
+#96           4       r       0        status_c_rsvd
+#100          1       r       0        uf_flag
+#101          1       r       0        af_flag
+#102          1       r       0        pf_flag
+#103          1       r       0        irqf_flag
+# -----------------------------------------------------------------
+# Status Register D
+#104          7       r       0        status_d_rsvd
+#111          1       r       0        valid_cmos_ram
+# -----------------------------------------------------------------
+# Diagnostic Status Register
+#112          8       r       0        diag_rsvd1
+
+# -----------------------------------------------------------------
+0            120     r       0        reserved_memory
+#120          264     r       0        unused
+
+# -----------------------------------------------------------------
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384          1       e       4        boot_option
+385          1       e       4        last_boot
+388          4       r       0        reboot_bits
+#390          2       r       0        unused?
+
+# -----------------------------------------------------------------
+# coreboot config options: console
+392          3       e       5        baud_rate
+395          4       e       6        debug_level
+#399          1       r       0        unused
+
+400          8       h       0        volume
+
+# coreboot config options: southbridge
+408          1       e       1        nmi
+409          2       e       7        power_on_after_fail
+
+# coreboot config options: EC
+411          1       e       8        first_battery
+412          1       e       1        bluetooth
+413          1       e       1        wwan
+414          1       e       1        touchpad
+415          1       e       1        wlan
+416          1       e       1        trackpoint
+417          1       e       1        fn_ctrl_swap
+418          1       e       1        sticky_fn
+419          1       e       1        power_management_beeps
+421          1       e       9        sata_mode
+#422          2       r       1        unused
+
+# coreboot config options: cpu
+424          1       e       2        hyper_threading
+#425          7       r       0        unused
+
+# coreboot config options: northbridge
+432          3       e       11       gfx_uma_size
+#435          549     r       0        unused
+
+# SandyBridge MRC Scrambler Seed values
+896          32      r       0        mrc_scrambler_seed
+928          32      r       0        mrc_scrambler_seed_s3
+960          16      r       0        mrc_scrambler_seed_chk
+
+# coreboot config options: check sums
+984          16      h       0        check_sum
+
+# -----------------------------------------------------------------
+
+enumerations
+
+#ID value   text
+1     0     Disable
+1     1     Enable
+2     0     Enable
+2     1     Disable
+4     0     Fallback
+4     1     Normal
+5     0     115200
+5     1     57600
+5     2     38400
+5     3     19200
+5     4     9600
+5     5     4800
+5     6     2400
+5     7     1200
+6     1     Emergency
+6     2     Alert
+6     3     Critical
+6     4     Error
+6     5     Warning
+6     6     Notice
+6     7     Info
+6     8     Debug
+6     9     Spew
+7     0     Disable
+7     1     Enable
+7     2     Keep
+8     0     Secondary
+8     1     Primary
+9     0     AHCI
+9     1     Compatible
+10    0     Both
+10    1     Keyboard only
+10    2     Thinklight only
+10    3     None
+11    0     32M
+11    1     64M
+11    2     96M
+11    3     128M
+11    4     160M
+11    5     192M
+11    6     224M
+
+# -----------------------------------------------------------------
+checksums
+
+checksum 392 415 984
diff --git a/src/mainboard/lenovo/t420s/devicetree.cb b/src/mainboard/lenovo/t420s/devicetree.cb
new file mode 100644
index 0000000000..990b576c70
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/devicetree.cb
@@ -0,0 +1,172 @@
+chip northbridge/intel/sandybridge
+
+	# Enable DisplayPort Hotplug with 6ms pulse
+	register "gpu_dp_d_hotplug" = "0x06"
+
+	# Enable Panel as LVDS and configure power delays
+	register "gpu_panel_port_select" = "0"			# LVDS
+	register "gpu_panel_power_cycle_delay" = "1"
+	register "gpu_panel_power_up_delay" = "300"		# T1+T2: 30ms
+	register "gpu_panel_power_down_delay" = "300"		# T5+T6: 30ms
+	register "gpu_panel_power_backlight_on_delay" = "2000"	# T3: 200ms
+	register "gpu_panel_power_backlight_off_delay" = "2000"	# T4: 200ms
+	register "gfx.use_spread_spectrum_clock" = "1"
+	register "gfx.lvds_dual_channel" = "1"
+	register "gfx.link_frequency_270_mhz" = "1"
+	register "gfx.lvds_num_lanes" = "4"
+	register "gpu_cpu_backlight" = "0x1155"
+	register "gpu_pch_backlight" = "0x06100610"
+
+	device cpu_cluster 0 on
+		chip cpu/intel/socket_rPGA988B
+			device lapic 0 on end
+		end
+		chip cpu/intel/model_206ax
+			# Magic APIC ID to locate this chip
+			device lapic 0xACAC off end
+
+			# Coordinate with HW_ALL
+			register "pstate_coord_type" = "0xfe"
+
+			register "c1_acpower" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "c2_acpower" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "c3_acpower" = "5"	# ACPI(C3) = MWAIT(C7)
+
+			register "c1_battery" = "1"	# ACPI(C1) = MWAIT(C1)
+			register "c2_battery" = "3"	# ACPI(C2) = MWAIT(C3)
+			register "c3_battery" = "5"	# ACPI(C3) = MWAIT(C7)
+		end
+	end
+
+	device domain 0 on
+		device pci 00.0 on
+			subsystemid 0x17aa 0x21d2
+		end # host bridge
+		device pci 01.0 off end # NVIDIA Corporation GF119M [NVS 4200M]
+		device pci 02.0 on
+			subsystemid 0x17aa 0x21d3
+		end # Integrated Graphics Controller
+
+		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
+			# GPI routing
+			#  0 No effect (default)
+			#  1 SMI# (if corresponding ALT_GPI_SMI_EN bit is also set)
+			#  2 SCI (if corresponding GPIO_EN bit is also set)
+			register "alt_gp_smi_en" = "0x0000"
+			register "gpi1_routing" = "2"
+			register "gpi8_routing" = "2"
+
+			# Enable SATA ports 0 (HDD bay) & 1 (ODD bay) & 2 (mSATA) & 4 (dock)
+			register "sata_port_map" = "0x17"
+			# Set max SATA speed to 6.0 Gb/s
+			register "sata_interface_speed_support" = "0x3"
+
+			register "gen1_dec" = "0x7c1601"
+			register "gen2_dec" = "0x0c15e1"
+			register "gen4_dec" = "0x0c06a1"
+
+			register "pcie_hotplug_map" = "{ 0, 0, 0, 1, 0, 0, 0, 0 }"
+
+			# Enable zero-based linear PCIe root port functions
+			register "pcie_port_coalesce" = "1"
+
+			register "c2_latency" = "101"  # c2 not supported
+			register "p_cnt_throttling_supported" = "1"
+
+			device pci 16.0 off end # Management Engine Interface 1
+			device pci 16.1 off end # Management Engine Interface 2
+			device pci 16.2 off end # Management Engine IDE-R
+			device pci 16.3 off end # Management Engine KT
+			device pci 19.0 on
+				subsystemid 0x17aa 0x21ce
+			end # Intel Gigabit Ethernet
+			device pci 1a.0 on
+				subsystemid 0x17aa 0x21d2
+			end # USB Enhanced Host Controller #2
+			device pci 1b.0 on
+				subsystemid 0x17aa 0x21d2
+			end # High Definition Audio Controller
+			device pci 1c.0 off end # PCIe Port #1
+			device pci 1c.1 on
+				subsystemid 0x17aa 0x21d2
+			end # PCIe Port #2 Integrated Wireless LAN
+			device pci 1c.2 off end # PCIe Port #3
+			device pci 1c.3 on
+				subsystemid 0x17aa 0x21d2
+			end # PCIe Port #4 ExpressCard
+			device pci 1c.4 off end # PCIe Port #5
+			device pci 1c.5 off end # PCIe Port #6 Intel Gigabit Ethernet PHY (not PCIe)
+			device pci 1c.6 on
+				subsystemid 0x17aa 0x21d2
+			end # PCIe Port #7 NEC Corporation uPD720200A USB 3.0 Host Controller
+			device pci 1c.7 off end # PCIe Port #8
+			device pci 1d.0 on
+				subsystemid 0x17aa 0x21d2
+			end # USB Enhanced Host Controller #1
+			device pci 1e.0 off end # PCI bridge
+			device pci 1f.0 on
+				subsystemid 0x17aa 0x21d2
+				chip ec/lenovo/pmh7
+					device pnp ff.1 on # dummy
+					end
+					register "backlight_enable" = "0x01"
+					register "dock_event_enable" = "0x01"
+				end
+
+				chip ec/lenovo/h8
+					device pnp ff.2 on # dummy
+						io 0x60 = 0x62
+						io 0x62 = 0x66
+						io 0x64 = 0x1600
+						io 0x66 = 0x1604
+					end
+
+					register "config0" = "0xa7"
+					register "config1" = "0x01"
+					register "config2" = "0xa0"
+					register "config3" = "0xe2"
+
+					register "has_keyboard_backlight" = "0"
+
+					register "beepmask0" = "0x02"
+					register "beepmask1" = "0x86"
+					register "has_power_management_beeps" = "1"
+					register "event2_enable" = "0xff"
+					register "event3_enable" = "0xff"
+					register "event4_enable" = "0xf0"
+					register "event5_enable" = "0x3c"
+					register "event6_enable" = "0x00"
+					register "event7_enable" = "0xa1"
+					register "event8_enable" = "0x7b"
+					register "event9_enable" = "0xff"
+					register "eventa_enable" = "0x00"
+					register "eventb_enable" = "0x00"
+					register "eventc_enable" = "0xff"
+					register "eventd_enable" = "0xff"
+					register "evente_enable" = "0x0d"
+				end
+			end # LPC Controller
+			device pci 1f.2 on
+				subsystemid 0x17aa 0x21d2
+			end # 6 port SATA AHCI Controller
+			device pci 1f.3 on
+				subsystemid 0x17aa 0x21d2
+				# eeprom, 8 virtual devices, same chip
+				chip drivers/i2c/at24rf08c
+					device i2c 54 on end
+					device i2c 55 on end
+					device i2c 56 on end
+					device i2c 57 on end
+					device i2c 5c on end
+					device i2c 5d on end
+					device i2c 5e on end
+					device i2c 5f on end
+				end
+			end # SMBus Controller
+			device pci 1f.5 off end # SATA Controller 2
+			device pci 1f.6 on
+				subsystemid 0x17aa 0x21d2
+			end # Thermal
+		end
+	end
+end
diff --git a/src/mainboard/lenovo/t420s/dsdt.asl b/src/mainboard/lenovo/t420s/dsdt.asl
new file mode 100644
index 0000000000..85e2b4f9e0
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/dsdt.asl
@@ -0,0 +1,56 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define THINKPAD_EC_GPE 17
+#define BRIGHTNESS_UP \_SB.PCI0.GFX0.LCD0.INCB
+#define BRIGHTNESS_DOWN \_SB.PCI0.GFX0.LCD0.DECB
+#define ACPI_VIDEO_DEVICE \_SB.PCI0.GFX0
+#define EC_LENOVO_H8_ME_WORKAROUND 1
+#define HAVE_LCD_SCREEN 1
+
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	0x02,		// DSDT revision: ACPI v2.0
+	"COREv4",	// OEM id
+	"COREBOOT",	// OEM table id
+	0x20110725	// OEM revision
+)
+{
+	// Some generic macros
+	#include "acpi/platform.asl"
+
+	// global NVS and variables
+	#include <southbridge/intel/bd82x6x/acpi/globalnvs.asl>
+
+	#include <cpu/intel/model_206ax/acpi/cpu.asl>
+
+	Scope (\_SB) {
+		Device (PCI0)
+		{
+			#include <northbridge/intel/sandybridge/acpi/sandybridge.asl>
+			#include <southbridge/intel/bd82x6x/acpi/pch.asl>
+		}
+	}
+
+	/* Chipset specific sleep states */
+	#include <southbridge/intel/bd82x6x/acpi/sleepstates.asl>
+}
diff --git a/src/mainboard/lenovo/t420s/gpio.c b/src/mainboard/lenovo/t420s/gpio.c
new file mode 100644
index 0000000000..14dee2da0f
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/gpio.c
@@ -0,0 +1,285 @@
+#include "southbridge/intel/bd82x6x/gpio.h"
+const struct pch_gpio_set1 pch_gpio_set1_mode = {
+	.gpio0  = GPIO_MODE_GPIO,   // -USB30_SMIB - input
+	.gpio1  = GPIO_MODE_GPIO,   // -EC_SCI - input
+	.gpio2  = GPIO_MODE_GPIO,   // -LCD_PRESENCE - input
+	.gpio3  = GPIO_MODE_GPIO,   // DOCKID0 - input
+	.gpio4  = GPIO_MODE_GPIO,   // DOCKID1 - input
+	.gpio5  = GPIO_MODE_GPIO,   // DOCKID2 - input
+	.gpio6  = GPIO_MODE_GPIO,   // SYSTEM_DP_HPD - input
+	.gpio7  = GPIO_MODE_GPIO,   // pullup
+	.gpio8  = GPIO_MODE_GPIO,   // pulldown - INTEGRATED ENABLED(FCIM) 0 / DISABLED (BTM) 1
+	.gpio9  = GPIO_MODE_NATIVE, // OC5 - -USB_PORT9_OC5 - input
+	.gpio10 = GPIO_MODE_GPIO,   // DRAMRST_GATE_ON - output
+	.gpio11 = GPIO_MODE_NATIVE, // SMBALERT# pullup
+	.gpio12 = GPIO_MODE_NATIVE, // LANPHYPC - output
+	.gpio13 = GPIO_MODE_GPIO,   // -EC_WAKE - input
+	.gpio14 = GPIO_MODE_NATIVE, // OC7 - pullup
+	.gpio15 = GPIO_MODE_GPIO,   // pullup - ME CRYPTO STRAP WITH TLS CONFIDENTIALITY
+	.gpio16 = GPIO_MODE_NATIVE, // SATA4GP - SATA_DOCK_DTCT - input from gpio33
+	.gpio17 = GPIO_MODE_GPIO,   // DGFX_PW RGD - input
+	.gpio18 = GPIO_MODE_NATIVE, // PCIECLKRQ1 - -CLKREQ_WLAN - input
+	.gpio19 = GPIO_MODE_NATIVE, // SATA1GP - SATA_BAY_DTCT - input to gpio22
+	.gpio20 = GPIO_MODE_NATIVE, // PCIECLKRQ2 - pullup
+	.gpio21 = GPIO_MODE_GPIO,   // -DISCRETE_GFX_PRESENCE - input
+	.gpio22 = GPIO_MODE_GPIO,   // SATA_BAY_DTCT - output to SATA1GP
+	.gpio23 = GPIO_MODE_NATIVE, // LDRQ1 - TP84
+	.gpio24 = GPIO_MODE_GPIO,   // pullup
+	.gpio25 = GPIO_MODE_NATIVE, // PCIECLKRQ3 - -CLKREQ_EXC - input
+	.gpio26 = GPIO_MODE_NATIVE, // PCIECLKRQ4 - pullup
+	.gpio27 = GPIO_MODE_GPIO,   // -MSATA_DTCT - input
+	.gpio28 = GPIO_MODE_GPIO,   // pulldown possible
+	.gpio29 = GPIO_MODE_GPIO,   // SLP_LAN - -PCH_SLP_LAN
+	.gpio30 = GPIO_MODE_NATIVE, // SUSPWRDNACK - output
+	.gpio31 = GPIO_MODE_NATIVE, // ACPRESENT - input
+};
+
+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,
+	.gpio9  = GPIO_DIR_INPUT,
+	.gpio10 = GPIO_DIR_OUTPUT,
+	.gpio11 = GPIO_DIR_INPUT,
+	.gpio12 = GPIO_DIR_OUTPUT,
+	.gpio13 = GPIO_DIR_INPUT,
+	.gpio14 = GPIO_DIR_INPUT,
+	.gpio15 = GPIO_DIR_OUTPUT,
+	.gpio16 = GPIO_DIR_INPUT,
+	.gpio17 = GPIO_DIR_INPUT,
+	.gpio18 = GPIO_DIR_INPUT,
+	.gpio19 = GPIO_DIR_INPUT,
+	.gpio20 = GPIO_DIR_INPUT,
+	.gpio21 = GPIO_DIR_INPUT,
+	.gpio22 = GPIO_DIR_OUTPUT,
+	.gpio23 = GPIO_DIR_INPUT,
+	.gpio24 = GPIO_DIR_OUTPUT,
+	.gpio25 = GPIO_DIR_INPUT,
+	.gpio26 = GPIO_DIR_INPUT,
+	.gpio27 = GPIO_DIR_OUTPUT,
+	.gpio28 = GPIO_DIR_OUTPUT,
+	.gpio29 = GPIO_DIR_OUTPUT,
+	.gpio30 = GPIO_DIR_OUTPUT,
+	.gpio31 = GPIO_DIR_INPUT
+};
+
+const struct pch_gpio_set1 pch_gpio_set1_level = {
+	.gpio0  = GPIO_LEVEL_HIGH,
+	.gpio1  = GPIO_LEVEL_HIGH,
+	.gpio2  = GPIO_LEVEL_LOW,
+	.gpio3  = GPIO_LEVEL_HIGH,
+	.gpio4  = GPIO_LEVEL_HIGH,
+	.gpio5  = GPIO_LEVEL_HIGH,
+	.gpio6  = GPIO_LEVEL_LOW,
+	.gpio7  = GPIO_LEVEL_HIGH,
+	.gpio8  = GPIO_LEVEL_HIGH,
+	.gpio9  = GPIO_LEVEL_HIGH,
+	.gpio10 = GPIO_LEVEL_HIGH,
+	.gpio11 = GPIO_LEVEL_HIGH,
+	.gpio12 = GPIO_LEVEL_HIGH,
+	.gpio13 = GPIO_LEVEL_HIGH,
+	.gpio14 = GPIO_LEVEL_HIGH,
+	.gpio15 = GPIO_LEVEL_LOW,
+	.gpio16 = GPIO_LEVEL_HIGH,
+	.gpio17 = GPIO_LEVEL_HIGH,
+	.gpio18 = GPIO_LEVEL_LOW,
+	.gpio19 = GPIO_LEVEL_HIGH,
+	.gpio20 = GPIO_LEVEL_HIGH,
+	.gpio21 = GPIO_LEVEL_LOW,
+	.gpio22 = GPIO_LEVEL_HIGH,
+	.gpio23 = GPIO_LEVEL_HIGH,
+	.gpio24 = GPIO_LEVEL_LOW,
+	.gpio25 = GPIO_LEVEL_LOW,
+	.gpio26 = GPIO_LEVEL_HIGH,
+	.gpio27 = GPIO_LEVEL_HIGH,
+	.gpio28 = GPIO_LEVEL_LOW,
+	.gpio29 = GPIO_LEVEL_HIGH,
+	.gpio30 = GPIO_LEVEL_HIGH,
+	.gpio31 = GPIO_LEVEL_HIGH,
+};
+
+const struct pch_gpio_set1 pch_gpio_set1_invert = {
+	.gpio0 = GPIO_INVERT,
+	.gpio1 = GPIO_INVERT,
+	.gpio13 = GPIO_INVERT,
+};
+
+const struct pch_gpio_set1 pch_gpio_set1_blink = {
+	.gpio18 = GPIO_NO_BLINK,
+};
+
+const struct pch_gpio_set2 pch_gpio_set2_mode = {
+	.gpio32 = GPIO_MODE_NATIVE, // CLKRUN - output
+	.gpio33 = GPIO_MODE_GPIO,   // SATA_DOCK_DTCT - output to SATA4GP
+	.gpio34 = GPIO_MODE_GPIO,   // DGFX_VRM_ID - input - HIGH: 1GB / LOW: 2GB
+	.gpio35 = GPIO_MODE_GPIO,   // pullup
+	.gpio36 = GPIO_MODE_GPIO,   // pulldown
+	.gpio37 = GPIO_MODE_GPIO,   // pulldown
+	.gpio38 = GPIO_MODE_GPIO,   // planarid2 - input - pulldown
+	.gpio39 = GPIO_MODE_GPIO,   // planarid3 - input - pulldown
+	.gpio40 = GPIO_MODE_NATIVE, // OC1 - -USB_PORT1_OC1 - input
+	.gpio41 = GPIO_MODE_NATIVE, // OC2 - pullup
+	.gpio42 = GPIO_MODE_GPIO,   // SMB_3B_EN - output
+	.gpio43 = GPIO_MODE_NATIVE, // OC4 - pullup
+	.gpio44 = GPIO_MODE_NATIVE, // PCIECLKRQ5 - -CLKREQ_GBE - input
+	.gpio45 = GPIO_MODE_NATIVE, // PCIECLKRQ6 - -CLKREQ_USB30_TR - input
+	.gpio46 = GPIO_MODE_NATIVE, // PCIECLKRQ7 - pullup
+	.gpio47 = GPIO_MODE_NATIVE, // PEG_A_CLKRQ# - input
+	.gpio48 = GPIO_MODE_GPIO,   // planarid0 - input - PDV low / FVT high
+	.gpio49 = GPIO_MODE_GPIO,   // planarid1 - input - pulldown
+	.gpio50 = GPIO_MODE_GPIO,   // -SC_DTCT - input
+	.gpio51 = GPIO_MODE_GPIO,   // pullup
+	.gpio52 = GPIO_MODE_GPIO,   // OPTIMUS_ENABLE - output - high: igpu / low: dgpu
+	.gpio53 = GPIO_MODE_GPIO,   // pullup
+	.gpio54 = GPIO_MODE_GPIO,   // -BDC_PRESENCE - input
+	.gpio55 = GPIO_MODE_GPIO,   // pullup
+	.gpio56 = GPIO_MODE_NATIVE, // PEG_B_CLKRQ - pullup
+	.gpio57 = GPIO_MODE_GPIO,   // -DTPM_PRESENCE - input
+	.gpio58 = GPIO_MODE_NATIVE, // SML1CLK - EC_SCL2 - output
+	.gpio59 = GPIO_MODE_NATIVE, // OC0 - pullup
+	.gpio60 = GPIO_MODE_NATIVE, // SML0ALERT# - pullup
+	.gpio61 = GPIO_MODE_NATIVE, // SUS_STAT - output
+	.gpio62 = GPIO_MODE_NATIVE, // SUSCLK - output
+	.gpio63 = GPIO_MODE_NATIVE, // SLP_S5 - output
+};
+
+const struct pch_gpio_set2 pch_gpio_set2_direction = {
+	.gpio32 = GPIO_DIR_INPUT,
+	.gpio33 = GPIO_DIR_OUTPUT,
+	.gpio34 = GPIO_DIR_INPUT,
+	.gpio35 = GPIO_DIR_OUTPUT,
+	.gpio36 = GPIO_DIR_INPUT,
+	.gpio37 = GPIO_DIR_INPUT,
+	.gpio38 = GPIO_DIR_INPUT,
+	.gpio39 = GPIO_DIR_INPUT,
+	.gpio40 = GPIO_DIR_INPUT,
+	.gpio41 = GPIO_DIR_INPUT,
+	.gpio42 = GPIO_DIR_OUTPUT,
+	.gpio43 = GPIO_DIR_INPUT,
+	.gpio44 = GPIO_DIR_INPUT,
+	.gpio45 = GPIO_DIR_INPUT,
+	.gpio46 = GPIO_DIR_INPUT,
+	.gpio47 = GPIO_DIR_INPUT,
+	.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,
+	.gpio56 = GPIO_DIR_INPUT,
+	.gpio57 = GPIO_DIR_INPUT,
+	.gpio58 = GPIO_DIR_INPUT,
+	.gpio59 = GPIO_DIR_INPUT,
+	.gpio60 = GPIO_DIR_INPUT,
+	.gpio61 = GPIO_DIR_OUTPUT,
+	.gpio62 = GPIO_DIR_OUTPUT,
+	.gpio63 = GPIO_DIR_OUTPUT,
+};
+
+const struct pch_gpio_set2 pch_gpio_set2_level = {
+	.gpio32 = GPIO_LEVEL_HIGH,
+	.gpio33 = GPIO_LEVEL_HIGH,
+	.gpio34 = GPIO_LEVEL_HIGH,
+	.gpio35 = GPIO_LEVEL_LOW,
+	.gpio36 = GPIO_LEVEL_LOW,
+	.gpio37 = GPIO_LEVEL_LOW,
+	.gpio38 = GPIO_LEVEL_HIGH,
+	.gpio39 = GPIO_LEVEL_LOW,
+	.gpio40 = GPIO_LEVEL_HIGH,
+	.gpio41 = GPIO_LEVEL_HIGH,
+	.gpio42 = GPIO_LEVEL_HIGH,
+	.gpio43 = GPIO_LEVEL_HIGH,
+	.gpio44 = GPIO_LEVEL_HIGH,
+	.gpio45 = GPIO_LEVEL_LOW,
+	.gpio46 = GPIO_LEVEL_HIGH,
+	.gpio47 = GPIO_LEVEL_LOW,
+	.gpio48 = GPIO_LEVEL_HIGH,
+	.gpio49 = GPIO_LEVEL_HIGH,
+	.gpio50 = GPIO_LEVEL_HIGH,
+	.gpio51 = GPIO_LEVEL_HIGH,
+	.gpio52 = GPIO_LEVEL_HIGH,
+	.gpio53 = GPIO_LEVEL_HIGH,
+	.gpio54 = GPIO_LEVEL_LOW,
+	.gpio55 = GPIO_LEVEL_HIGH,
+	.gpio56 = GPIO_LEVEL_HIGH,
+	.gpio57 = GPIO_LEVEL_LOW,
+	.gpio58 = GPIO_LEVEL_HIGH,
+	.gpio59 = GPIO_LEVEL_HIGH,
+	.gpio60 = GPIO_LEVEL_HIGH,
+	.gpio61 = GPIO_LEVEL_HIGH,
+	.gpio62 = GPIO_LEVEL_LOW,
+	.gpio63 = GPIO_LEVEL_HIGH,
+};
+
+const struct pch_gpio_set3 pch_gpio_set3_mode = {
+	.gpio64 = GPIO_MODE_NATIVE, // NC
+	.gpio65 = GPIO_MODE_NATIVE, // VIDEO_CLK_27M_NSS - output
+	.gpio66 = GPIO_MODE_NATIVE, // NC
+	.gpio67 = GPIO_MODE_NATIVE, // VIDEO_CLK_27M_SS - output
+	.gpio68 = GPIO_MODE_GPIO,   // -INT_MIC_DTCT - input
+	.gpio69 = GPIO_MODE_GPIO,   // mic enable bit - low enable - pulldown
+	.gpio70 = GPIO_MODE_GPIO,   // pullup
+	.gpio71 = GPIO_MODE_GPIO,   // pullup
+	.gpio72 = GPIO_MODE_NATIVE, // BATLOW - input
+	.gpio73 = GPIO_MODE_NATIVE, // pullup
+	.gpio74 = GPIO_MODE_NATIVE, // pullup
+	.gpio75 = GPIO_MODE_NATIVE, // SML1DATA - EC_SDA2 - i/o
+};
+
+const struct pch_gpio_set3 pch_gpio_set3_direction = {
+	.gpio64 = GPIO_DIR_OUTPUT,
+	.gpio65 = GPIO_DIR_OUTPUT,
+	.gpio66 = GPIO_DIR_OUTPUT,
+	.gpio67 = GPIO_DIR_OUTPUT,
+	.gpio68 = GPIO_DIR_INPUT,
+	.gpio69 = GPIO_DIR_INPUT,
+	.gpio70 = GPIO_DIR_INPUT,
+	.gpio71 = GPIO_DIR_INPUT,
+	.gpio72 = GPIO_DIR_INPUT,
+	.gpio73 = GPIO_DIR_INPUT,
+	.gpio74 = GPIO_DIR_INPUT,
+	.gpio75 = GPIO_DIR_INPUT,
+};
+
+const struct pch_gpio_set3 pch_gpio_set3_level = {
+	.gpio64 = GPIO_LEVEL_HIGH,
+	.gpio65 = GPIO_LEVEL_HIGH,
+	.gpio66 = GPIO_LEVEL_HIGH,
+	.gpio67 = GPIO_LEVEL_HIGH,
+	.gpio68 = GPIO_LEVEL_LOW,
+	.gpio69 = GPIO_LEVEL_LOW,
+	.gpio70 = GPIO_LEVEL_LOW,
+	.gpio71 = GPIO_LEVEL_HIGH,
+	.gpio72 = GPIO_LEVEL_HIGH,
+	.gpio73 = GPIO_LEVEL_HIGH,
+	.gpio74 = GPIO_LEVEL_HIGH,
+	.gpio75 = GPIO_LEVEL_HIGH,
+};
+
+const struct pch_gpio_map mainboard_gpio_map = {
+	.set1 = {
+		.mode		= &pch_gpio_set1_mode,
+		.direction	= &pch_gpio_set1_direction,
+		.level		= &pch_gpio_set1_level,
+		.invert		= &pch_gpio_set1_invert,
+		.blink		= &pch_gpio_set1_blink,
+	},
+	.set2 = {
+		.mode		= &pch_gpio_set2_mode,
+		.direction	= &pch_gpio_set2_direction,
+		.level		= &pch_gpio_set2_level,
+	},
+	.set3 = {
+		.mode		= &pch_gpio_set3_mode,
+		.direction	= &pch_gpio_set3_direction,
+		.level		= &pch_gpio_set3_level,
+	},
+};
diff --git a/src/mainboard/lenovo/t420s/hda_verb.c b/src/mainboard/lenovo/t420s/hda_verb.c
new file mode 100644
index 0000000000..6582a61bf3
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/hda_verb.c
@@ -0,0 +1,73 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/*	Vendor Name    : Conexant
+ *	Vendor ID      : 0x14f1506e
+ *	Subsystem ID   : 0x17aa21d2
+ *	Revision ID    : 0x100002
+ */
+
+
+#include <device/azalia_device.h>
+
+const u32 cim_verb_data[] = {
+	/* coreboot specific header */
+	0x14f1506e,	// Codec Vendor / Device ID: Conexant CX20590 - Schematic show CX20672
+	0x17aa21d2,	// Subsystem ID
+	0x0000000d,	// Number of 4 dword sets
+
+/* Bits 31:28 - Codec Address */
+/* Bits 27:20 - NID */
+/* Bits 19:8 - Verb ID */
+/* Bits 7:0  - Payload */
+
+/* NID 0x01 - NodeInfo */
+	AZALIA_SUBVENDOR(0x0, 0x17AA21D2),
+
+	AZALIA_PIN_CFG(0x0, 0x19, 0x04211040),
+	AZALIA_PIN_CFG(0x0, 0x1A, 0x61A19050),
+	AZALIA_PIN_CFG(0x0, 0x1B, 0x04A11060),
+	AZALIA_PIN_CFG(0x0, 0x1C, 0x6121401F),
+	AZALIA_PIN_CFG(0x0, 0x1D, 0x40F001F0),
+	AZALIA_PIN_CFG(0x0, 0x1E, 0x40F001F0),
+	AZALIA_PIN_CFG(0x0, 0x1F, 0x90170110),
+	AZALIA_PIN_CFG(0x0, 0x20, 0x40F001F0),
+	AZALIA_PIN_CFG(0x0, 0x22, 0x40F001F0),
+	AZALIA_PIN_CFG(0x0, 0x23, 0x90A60170),
+
+	/* Misc entries */
+		0x00B707C0, /* Enable PortB as Output with HP amp */
+		0x00D70740, /* Enable PortD as Output */
+		0x0017A200, /* Disable ClkEn of PortSenseTst */
+		0x0017C621, /* Slave Port - Port A used as microphone input for
+		                            combo Jack
+		               Master Port - Port B used for Jack Presence Detect
+		               Enable Combo Jack Detection */
+		0x0017A208, /* Enable ClkEn of PortSenseTst */
+		0x00170500, /* Set power state to D0 */
+		0x00170500, /* Padding */
+		0x00170500, /* Padding */
+};
+
+const u32 pc_beep_verbs[] = {
+	0x02177a00, /* Digital PCBEEP Gain: 0h=-9db, 1h=-6db ... 4h=+3db, 5h=+6db */
+};
+
+AZALIA_ARRAY_SIZES;
diff --git a/src/mainboard/lenovo/t420s/mainboard.c b/src/mainboard/lenovo/t420s/mainboard.c
new file mode 100644
index 0000000000..698301d866
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/mainboard.c
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2007-2009 coresystems GmbH
+ * Copyright (C) 2011-2012 Google Inc.
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <types.h>
+#include <string.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <device/pci_ops.h>
+#include <console/console.h>
+#include <drivers/intel/gma/int15.h>
+#include <arch/acpi.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+#include <smbios.h>
+#include <device/pci.h>
+#include <pc80/keyboard.h>
+#include <ec/lenovo/h8/h8.h>
+#include <version.h>
+
+void mainboard_suspend_resume(void)
+{
+	/* Call SMM finalize() handlers before resume */
+	outb(0xcb, 0xb2);
+}
+
+const char *smbios_mainboard_bios_version(void)
+{
+	static char *s = NULL;
+
+	/* Satisfy thinkpad_acpi.  */
+	if (strlen(CONFIG_LOCALVERSION))
+		return "CBET4000 " CONFIG_LOCALVERSION;
+
+	if (s != NULL)
+		return s;
+	s = strconcat("CBET4000 ", coreboot_version);
+	return s;
+}
+
+static void mainboard_init(device_t dev)
+{
+	/* init spi */
+	RCBA32(0x38c8) = 0x00002005;
+	RCBA32(0x38c4) = 0x00802005;
+	RCBA32(0x38c0) = 0x00000007;
+
+	pc_keyboard_init();
+}
+
+static void mainboard_enable(device_t dev)
+{
+	dev->ops->init = mainboard_init;
+
+	install_intel_vga_int15_handler(GMA_INT15_ACTIVE_LFP_INT_LVDS, GMA_INT15_PANEL_FIT_DEFAULT, GMA_INT15_BOOT_DISPLAY_DEFAULT, 0);
+}
+
+void h8_mainboard_init_dock(void)
+{
+}
+
+struct chip_operations mainboard_ops = {
+	.enable_dev = mainboard_enable,
+};
diff --git a/src/mainboard/lenovo/t420s/romstage.c b/src/mainboard/lenovo/t420s/romstage.c
new file mode 100644
index 0000000000..61951ae403
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/romstage.c
@@ -0,0 +1,73 @@
+/*
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <arch/byteorder.h>
+#include <arch/io.h>
+#include <device/pci_def.h>
+#include <console/console.h>
+#include <northbridge/intel/sandybridge/raminit_native.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+
+void pch_enable_lpc(void)
+{
+	/* EC Decode Range Port60/64, Port62/66 */
+	/* Enable EC, PS/2 Keyboard/Mouse */
+	pci_write_config16(PCH_LPC_DEV, LPC_EN,
+			   CNF2_LPC_EN | CNF1_LPC_EN | MC_LPC_EN | KBC_LPC_EN |
+			   COMA_LPC_EN);
+
+	pci_write_config32(PCH_LPC_DEV, LPC_GEN1_DEC, 0x7c1601);
+	pci_write_config32(PCH_LPC_DEV, LPC_GEN2_DEC, 0xc15e1);
+	pci_write_config32(PCH_LPC_DEV, LPC_GEN4_DEC, 0x0c06a1);
+
+	pci_write_config16(PCH_LPC_DEV, LPC_IO_DEC, 0x10);
+
+	pci_write_config32(PCH_LPC_DEV, 0xac, 0x80010000);
+}
+
+void rcba_config(void)
+{
+	/* Disable unused devices (board specific) */
+	RCBA32(FD) = 0x1eb51fe3;
+	RCBA32(BUC) = 0;
+}
+
+const struct southbridge_usb_port mainboard_usb_ports[] = {
+	{ 0, 1, -1 }, /* P0 empty */
+	{ 1, 1,  1 }, /* P1 system port 2 (To system port) (EHCI debug), OC 1 */
+	{ 1, 1, -1 }, /* P2: HALF MINICARD (WLAN) no oc */
+	{ 1, 0, -1 }, /* P3: WWAN, no OC */
+	{ 1, 1, -1 }, /* P4: smartcard, no OC */
+	{ 1, 1, -1 }, /* P5: ExpressCard, no OC */
+	{ 0, 0, -1 }, /* P6: empty */
+	{ 0, 0, -1 }, /* P7: empty */
+	{ 0, 1, -1 }, /* P8: empty (touch panel) */
+	{ 1, 0,  5 }, /* P9: system port 1 (To USBAO) (EHCI debug), OC 5 */
+	{ 1, 0, -1 }, /* P10: fingerprint reader, no OC */
+	{ 1, 1, -1 }, /* P11: bluetooth, no OC. */
+	{ 1, 1, -1 }, /* P12: docking, no OC */
+	{ 1, 1, -1 }, /* P13: camera (LCD), no OC */
+};
+
+void mainboard_get_spd(spd_raw_data *spd) {
+	read_spd(&spd[0], 0x50);
+	read_spd(&spd[2], 0x51);
+}
diff --git a/src/mainboard/lenovo/t420s/smihandler.c b/src/mainboard/lenovo/t420s/smihandler.c
new file mode 100644
index 0000000000..dd8878fdfa
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/smihandler.c
@@ -0,0 +1,194 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301 USA
+ */
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <cpu/x86/smm.h>
+#include <ec/acpi/ec.h>
+#include <pc80/mc146818rtc.h>
+#include <ec/lenovo/h8/h8.h>
+#include <delay.h>
+#include <southbridge/intel/bd82x6x/nvs.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+#include <southbridge/intel/bd82x6x/me.h>
+#include <northbridge/intel/sandybridge/sandybridge.h>
+#include <cpu/intel/model_206ax/model_206ax.h>
+
+/* The southbridge SMI handler checks whether gnvs has a
+ * valid pointer before calling the trap handler
+ */
+extern global_nvs_t *gnvs;
+
+static void mainboard_smm_init(void)
+{
+	printk(BIOS_DEBUG, "initializing SMI\n");
+	/* Enable 0x1600/0x1600 register pair */
+	ec_set_bit(0x00, 0x05);
+}
+
+int mainboard_io_trap_handler(int smif)
+{
+	static int smm_initialized;
+
+	if (!smm_initialized) {
+		mainboard_smm_init();
+		smm_initialized = 1;
+	}
+
+	switch (smif) {
+		default:
+			return 0;
+	}
+
+	/* On success, the IO Trap Handler returns 1
+	 * On failure, the IO Trap Handler returns a value != 1 */
+	return 1;
+}
+
+static void mainboard_smi_brightness_up(void)
+{
+	u8 value;
+
+	if ((value = pci_read_config8(PCI_DEV(0, 2, 1), 0xf4)) < 0xf0)
+		pci_write_config8(PCI_DEV(0, 2, 1), 0xf4, (value + 0x10) | 0xf);
+}
+
+static void mainboard_smi_brightness_down(void)
+{
+	u8 value;
+
+	if ((value = pci_read_config8(PCI_DEV(0, 2, 1), 0xf4)) > 0x10)
+		pci_write_config8(PCI_DEV(0, 2, 1), 0xf4,
+				  (value - 0x10) & 0xf0);
+}
+
+static void mainboard_smi_handle_ec_sci(void)
+{
+	u8 status = inb(EC_SC);
+	u8 event;
+
+	if (!(status & EC_SCI_EVT))
+		return;
+
+	event = ec_query();
+	printk(BIOS_DEBUG, "EC event %02x\n", event);
+
+	switch (event) {
+		case 0x14:
+			/* brightness up */
+			mainboard_smi_brightness_up();
+			break;
+		case 0x15:
+			/* brightness down */
+			mainboard_smi_brightness_down();
+			break;
+		default:
+			break;
+	}
+}
+
+void mainboard_smi_gpi(u32 gpi_sts)
+{
+	if (gpi_sts & (1 << 12))
+		mainboard_smi_handle_ec_sci();
+}
+
+static int mainboard_finalized = 0;
+
+int mainboard_smi_apmc(u8 data)
+{
+	u16 pmbase = pci_read_config16(PCI_DEV(0, 0x1f, 0), 0x40) & 0xfffc;
+	u8 tmp;
+
+	printk(BIOS_DEBUG, "%s: pmbase %04X, data %02X\n", __func__, pmbase,
+	       data);
+
+	if (!pmbase)
+		return 0;
+
+	switch (data) {
+		case APM_CNT_ACPI_ENABLE:
+			/* use 0x1600/0x1604 to prevent races with userspace */
+			ec_set_ports(0x1604, 0x1600);
+			/* route H8SCI to SCI */
+			outw(inw(ALT_GP_SMI_EN) & ~0x1000, pmbase + ALT_GP_SMI_EN);
+			tmp = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xbb);
+			tmp &= ~0x03;
+			tmp |= 0x02;
+			pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xbb, tmp);
+			/* discard all events, and enable attention */
+			ec_write(0x80, 0x01);
+			break;
+		case APM_CNT_ACPI_DISABLE:
+			/* we have to use port 0x62/0x66, as 0x1600/0x1604 doesn't
+			   provide a EC query function */
+			ec_set_ports(0x66, 0x62);
+			/* route H8SCI# to SMI */
+			outw(inw(pmbase + ALT_GP_SMI_EN) | 0x1000,
+			     pmbase + ALT_GP_SMI_EN);
+			tmp = pci_read_config8(PCI_DEV(0, 0x1f, 0), 0xbb);
+			tmp &= ~0x03;
+			tmp |= 0x01;
+			pci_write_config8(PCI_DEV(0, 0x1f, 0), 0xbb, tmp);
+			/* discard all events, and enable attention */
+			ec_write(0x80, 0x01);
+			break;
+		case APM_CNT_FINALIZE:
+			printk(BIOS_DEBUG, "APMC: FINALIZE\n");
+			if (mainboard_finalized) {
+				printk(BIOS_DEBUG, "APMC#: Already finalized\n");
+				return 0;
+			}
+
+			intel_me_finalize_smm();
+			intel_pch_finalize_smm();
+			intel_sandybridge_finalize_smm();
+			intel_model_206ax_finalize_smm();
+
+			mainboard_finalized = 1;
+			break;
+
+		default:
+			break;
+	}
+	return 0;
+}
+
+void mainboard_smi_sleep(u8 slp_typ)
+{
+	if (slp_typ == 3) {
+		u8 ec_wake = ec_read(0x32);
+		/* If EC wake events are enabled, enable wake on EC WAKE GPE.  */
+		if (ec_wake & 0x14) {
+			u32 gpe_rout;
+			u16 pmbase = pci_read_config16(PCI_DEV(0, 0x1f, 0), 0x40) & 0xfffc;
+
+			/* Enable EC WAKE GPE.  */
+			outl(inl(pmbase + GPE0_EN) | (1 << 29), pmbase + GPE0_EN);
+			gpe_rout = pci_read_config32(PCI_DEV(0, 0x1f, 0), GPIO_ROUT);
+			/* Redirect EC WAKE GPE to SCI.  */
+			gpe_rout &= ~(3 << 26);
+			gpe_rout |= (2 << 26);
+			pci_write_config32(PCI_DEV(0, 0x1f, 0), GPIO_ROUT, gpe_rout);
+		}
+	}
+}
diff --git a/src/mainboard/lenovo/t420s/thermal.h b/src/mainboard/lenovo/t420s/thermal.h
new file mode 100644
index 0000000000..43b7a4bdd7
--- /dev/null
+++ b/src/mainboard/lenovo/t420s/thermal.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The Chromium OS 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef T420S_THERMAL_H
+#define T420S_THERMAL_H
+
+	/* Temperature which OS will shutdown at */
+	#define CRITICAL_TEMPERATURE	100
+
+	/* Temperature which OS will throttle CPU */
+	#define PASSIVE_TEMPERATURE	90
+
+#endif