mb/system76/cml-u: Add System76 Galago Pro 4

Change-Id: I3dfa2ab430439d8dc71531b92aa7800db94d603b
Signed-off-by: Jeremy Soller <jeremy@system76.com>
Signed-off-by: Tim Crawford <tcrawford@system76.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52034
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

23 files changed, 759 insertions, 0 deletions

diff --git a/Documentation/mainboard/index.md b/Documentation/mainboard/index.md
index f8bd466eba0a..0d05bbde2e32 100644
--- a/Documentation/mainboard/index.md
+++ b/Documentation/mainboard/index.md
@@ -181,6 +181,7 @@ The boards in this section are not real mainboards, but emulators.
 ## System76
 
 - [Darter Pro 7](system76/darp7.md)
+- [Galago Pro 4](system76/galp4.md)
 - [Galago Pro 5](system76/galp5.md)
 - [Gazelle 15](system76/gaze15.md)
 - [Lemur Pro 9](system76/lemp9.md)
diff --git a/Documentation/mainboard/system76/galp4.md b/Documentation/mainboard/system76/galp4.md
new file mode 100644
index 000000000000..aa661fec88fe
--- /dev/null
+++ b/Documentation/mainboard/system76/galp4.md
@@ -0,0 +1,65 @@
+# System76 Galago Pro 4 (galp4)
+
+## Specs
+
+- CPU
+  - Intel Core i7-10510U
+  - Intel Core i5-10210U
+- EC
+  - ITE IT8587E running [System76 EC](https://github.com/system76/ec)
+- Graphics
+  - Intel UHD Graphics 620
+  - eDP 14.1" 1920x1080@60Hz LCD (Innolux N140HCA-EAC)
+  - 1x HDMI
+  - 1x Mini DisplayPort 1.2
+  - 1x DisplayPort over USB-C
+- Memory
+  - Up to 64 (2x32GB) dual-channel DDR4 SO-DIMMs @ 2666 MHz
+- Networking
+  - Gigabit Ethernet
+  - M.2 PCIe/CNVi WiFi/Bluetooth
+    - Intel Wi-Fi 6 AX200/AX201
+    - or Intel Wireless-AC 9560
+- Power
+  - 40W (19V, 2.1A) AC barrel adapter
+    - Chicony A13-040A3A, using a C5 power cord
+  - 35.3Wh 3-cell Lithium-Ion battery
+- Sound
+  - Realtek ALC293 codec
+  - Internal speakers and microphone
+  - 3.5mm headphone jack
+  - 3.5mm microphone jack
+  - HDMI, Mini DisplayPort, USB-C DisplayPort audio
+- Storage
+  - 1x M.2 PCIe NVMe or SATA SSD
+  - 1x 2.5" SATA SSD
+  - SD card reader
+- USB
+  - 1x USB Type-C with Thunderbolt 3
+  - 2x USB 3.1 Gen 1 Type-A
+- Dimensions
+  - 1.8cm x 33cm x 22.5cm, 1.3kg
+
+## Flashing coreboot
+
+```eval_rst
++---------------------+-----------------+
+| Type                | Value           |
++=====================+=================+
+| Socketed flash      | no              |
++---------------------+-----------------+
+| Vendor              | GigaDevice      |
++---------------------+-----------------+
+| Model               | GD25B127D       |
++---------------------+-----------------+
+| Size                | 16 MiB          |
++---------------------+-----------------+
+| Package             | SOIC-8          |
++---------------------+-----------------+
+| Internal flashing   | yes             |
++---------------------+-----------------+
+| External flashing   | yes             |
++---------------------+-----------------+
+```
+
+The flash chip (U25) is right of the DIMM slots.
diff --git a/src/mainboard/system76/cml-u/Kconfig b/src/mainboard/system76/cml-u/Kconfig
new file mode 100644
index 000000000000..87559025be96
--- /dev/null
+++ b/src/mainboard/system76/cml-u/Kconfig
@@ -0,0 +1,64 @@
+if BOARD_SYSTEM76_GALP4
+
+config BOARD_SPECIFIC_OPTIONS
+	def_bool y
+	select BOARD_ROMSIZE_KB_16384
+	select DRIVERS_I2C_HID
+	select EC_SYSTEM76_EC
+	select EC_SYSTEM76_EC_BAT_THRESHOLDS
+	select HAVE_ACPI_RESUME
+	select HAVE_ACPI_TABLES
+	select HAVE_CMOS_DEFAULT
+	select HAVE_OPTION_TABLE
+	select INTEL_GMA_HAVE_VBT
+	select INTEL_LPSS_UART_FOR_CONSOLE
+	select MAINBOARD_HAS_LPC_TPM
+	select MAINBOARD_HAS_TPM2
+	select NO_UART_ON_SUPERIO
+	select PCIEXP_HOTPLUG
+	select PCIEXP_HOTPLUG_PREFETCH_MEM_BELOW_4G # Fix running out of MTRRs
+	select SOC_INTEL_COMETLAKE_1
+	select SOC_INTEL_COMMON_BLOCK_HDA_VERB
+	select SPD_READ_BY_WORD
+	select SYSTEM_TYPE_LAPTOP
+
+config MAINBOARD_DIR
+	default "system76/cml-u"
+
+config VARIANT_DIR
+	default "galp4" if BOARD_SYSTEM76_GALP4
+
+config OVERRIDE_DEVICETREE
+	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
+
+config MAINBOARD_PART_NUMBER
+	default "galp4" if BOARD_SYSTEM76_GALP4
+
+config MAINBOARD_SMBIOS_PRODUCT_NAME
+	default "Galago Pro" if BOARD_SYSTEM76_GALP4
+
+config MAINBOARD_VERSION
+	default "galp4" if BOARD_SYSTEM76_GALP4
+
+config CBFS_SIZE
+	default 0xA00000
+
+config CONSOLE_POST
+	default y
+
+config ONBOARD_VGA_IS_PRIMARY
+	default y
+
+config UART_FOR_CONSOLE
+	default 2
+
+config DIMM_MAX
+	default 2
+
+config VGA_BIOS_ID
+	default "8086,9b41"
+
+config POST_DEVICE
+	default n
+
+endif
diff --git a/src/mainboard/system76/cml-u/Kconfig.name b/src/mainboard/system76/cml-u/Kconfig.name
new file mode 100644
index 000000000000..4bd0279cce4b
--- /dev/null
+++ b/src/mainboard/system76/cml-u/Kconfig.name
@@ -0,0 +1,2 @@
+config BOARD_SYSTEM76_GALP4
+	bool "galp4"
diff --git a/src/mainboard/system76/cml-u/Makefile.inc b/src/mainboard/system76/cml-u/Makefile.inc
new file mode 100644
index 000000000000..d749e412cce0
--- /dev/null
+++ b/src/mainboard/system76/cml-u/Makefile.inc
@@ -0,0 +1,8 @@
+CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/include
+
+bootblock-y += bootblock.c
+bootblock-y += gpio_early.c
+
+ramstage-y += ramstage.c
+ramstage-y += gpio.c
+ramstage-y += variants/$(VARIANT_DIR)/hda_verb.c
diff --git a/src/mainboard/system76/cml-u/acpi/gpe.asl b/src/mainboard/system76/cml-u/acpi/gpe.asl
new file mode 100644
index 000000000000..e0da47670553
--- /dev/null
+++ b/src/mainboard/system76/cml-u/acpi/gpe.asl
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+// GPP_D9 SCI
+Method (_L29, 0, Serialized) {
+	Debug = Concatenate("GPE _L29: ", ToHexString(\_SB.PCI0.LPCB.EC0.WFNO))
+	If (\_SB.PCI0.LPCB.EC0.ECOK) {
+		If (\_SB.PCI0.LPCB.EC0.WFNO == 1) {
+			Notify(\_SB.LID0, 0x80)
+		}
+	}
+}
diff --git a/src/mainboard/system76/cml-u/acpi/mainboard.asl b/src/mainboard/system76/cml-u/acpi/mainboard.asl
new file mode 100644
index 000000000000..416cc5a1511b
--- /dev/null
+++ b/src/mainboard/system76/cml-u/acpi/mainboard.asl
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#define EC_GPE_SCI 0x50 /* GPP_E16 */
+#define EC_GPE_SWI 0x29 /* GPP_D9 */
+#include <ec/system76/ec/acpi/ec.asl>
+
+Scope (\_SB) {
+	#include "sleep.asl"
+}
+
+Scope (\_GPE) {
+	#include "gpe.asl"
+}
diff --git a/src/mainboard/system76/cml-u/acpi/sleep.asl b/src/mainboard/system76/cml-u/acpi/sleep.asl
new file mode 100644
index 000000000000..48c50e075e30
--- /dev/null
+++ b/src/mainboard/system76/cml-u/acpi/sleep.asl
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/* Method called from _PTS prior to enter sleep state */
+Method (MPTS, 1) {
+	\_SB.PCI0.LPCB.EC0.PTS (Arg0)
+}
+
+/* Method called from _WAK prior to wakeup */
+Method (MWAK, 1) {
+	\_SB.PCI0.LPCB.EC0.WAK (Arg0)
+}
diff --git a/src/mainboard/system76/cml-u/board_info.txt b/src/mainboard/system76/cml-u/board_info.txt
new file mode 100644
index 000000000000..a4f235150ee9
--- /dev/null
+++ b/src/mainboard/system76/cml-u/board_info.txt
@@ -0,0 +1,8 @@
+Vendor name: System76
+Board name: cml-u
+Category: laptop
+Release year: 2019
+ROM package: SOIC-8
+ROM protocol: SPI
+ROM socketed: n
+Flashrom support: y
diff --git a/src/mainboard/system76/cml-u/bootblock.c b/src/mainboard/system76/cml-u/bootblock.c
new file mode 100644
index 000000000000..8d06adc9d7f7
--- /dev/null
+++ b/src/mainboard/system76/cml-u/bootblock.c
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootblock_common.h>
+#include <mainboard/gpio.h>
+
+void bootblock_mainboard_early_init(void)
+{
+	mainboard_configure_early_gpios();
+}
diff --git a/src/mainboard/system76/cml-u/cmos.default b/src/mainboard/system76/cml-u/cmos.default
new file mode 100644
index 000000000000..d56495357c3e
--- /dev/null
+++ b/src/mainboard/system76/cml-u/cmos.default
@@ -0,0 +1,3 @@
+boot_option=Fallback
+debug_level=Debug
+power_on_after_fail=Enable
diff --git a/src/mainboard/system76/cml-u/cmos.layout b/src/mainboard/system76/cml-u/cmos.layout
new file mode 100644
index 000000000000..ca7c7a4c5c4b
--- /dev/null
+++ b/src/mainboard/system76/cml-u/cmos.layout
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+entries
+
+0	384	r	0	reserved_memory
+
+# RTC_BOOT_BYTE (coreboot hardcoded)
+384	1	e	4	boot_option
+388	4	h	0	reboot_counter
+
+# RTC_CLK_ALTCENTURY
+400	8	r	0	century
+
+409	2	e	7	power_on_after_fail
+412	4	e	6	debug_level
+984	16	h	0	check_sum
+
+enumerations
+
+4	0	Fallback
+4	1	Normal
+
+6	0	Emergency
+6	1	Alert
+6	2	Critical
+6	3	Error
+6	4	Warning
+6	5	Notice
+6	6	Info
+6	7	Debug
+6	8	Spew
+
+7	0	Disable
+7	1	Enable
+7	2	Keep
+
+checksums
+
+checksum 408 983 984
diff --git a/src/mainboard/system76/cml-u/devicetree.cb b/src/mainboard/system76/cml-u/devicetree.cb
new file mode 100644
index 000000000000..232d36c589c8
--- /dev/null
+++ b/src/mainboard/system76/cml-u/devicetree.cb
@@ -0,0 +1,179 @@
+chip soc/intel/cannonlake
+	register "common_soc_config" = "{
+		/* Touchpad */
+		.i2c[0] = {
+			.speed = I2C_SPEED_FAST,
+			.rise_time_ns = 80,
+			.fall_time_ns = 110,
+		},
+	}"
+
+# CPU (soc/intel/cannonlake/cpu.c)
+	# Power limit
+	register "power_limits_config" = "{
+		.tdp_pl1_override = 20,
+		.tdp_pl2_override = 30,
+	}"
+
+	# Enable Enhanced Intel SpeedStep
+	register "eist_enable" = "1"
+
+# FSP Memory (soc/intel/cannonlake/romstage/fsp_params.c)
+	register "SaGv" = "SaGv_Enabled"
+	register "enable_c6dram" = "1"
+
+# FSP Silicon (soc/intel/cannonlake/fsp_params.c)
+	# Serial I/O
+	register "SerialIoDevMode" = "{
+		[PchSerialIoIndexI2C0] = PchSerialIoPci, // Touchpad
+		[PchSerialIoIndexUART2] = PchSerialIoSkipInit, // LPSS UART
+	}"
+
+	# Misc
+	register "AcousticNoiseMitigation" = "1"
+
+	# Power
+	register "PchPmSlpS3MinAssert" = "3"	# 50ms
+	register "PchPmSlpS4MinAssert" = "1"	# 1s
+	register "PchPmSlpSusMinAssert" = "2"	# 500ms
+	register "PchPmSlpAMinAssert" = "4"	# 2s
+
+	# Thermal
+	register "tcc_offset" = "12"
+
+	# Serial IRQ Continuous
+	register "serirq_mode" = "SERIRQ_CONTINUOUS"
+
+# PM Util (soc/intel/cannonlake/pmutil.c)
+	# GPE configuration
+	# Note that GPE events called out in ASL code rely on this
+	# route. i.e. If this route changes then the affected GPE
+	# offset bits also need to be changed.
+	register "gpe0_dw0" = "PMC_GPP_C"
+	register "gpe0_dw1" = "PMC_GPP_D"
+	register "gpe0_dw2" = "PMC_GPP_E"
+
+# Actual device tree
+	device cpu_cluster 0 on
+		device lapic 0 on end
+	end
+
+	device domain 0 on
+		device pci 00.0 on  end # Host Bridge
+		device pci 02.0 on      # Integrated Graphics Device
+			register "gfx" = "GMA_DEFAULT_PANEL(0)"
+		end
+		device pci 04.0 on      # SA Thermal device
+			register "Device4Enable" = "1"
+		end
+		device pci 12.0 on  end # Thermal Subsystem
+		device pci 12.5 off end # UFS SCS
+		device pci 12.6 off end # GSPI #2
+		device pci 13.0 off end # Integrated Sensor Hub
+		device pci 14.0 on      # USB xHCI
+			# USB2
+			register "usb2_ports[0]" = "USB2_PORT_MID(OC_SKIP)"		# Type-A port 1
+			register "usb2_ports[1]" = "USB2_PORT_MID(OC_SKIP)"		# 3G / LTE
+			register "usb2_ports[2]" = "USB2_PORT_TYPE_C(OC_SKIP)"		# Type-C port 3
+			register "usb2_ports[3]" = "USB2_PORT_MID(OC_SKIP)"		# USB Board port 4
+			register "usb2_ports[6]" = "USB2_PORT_MAX(OC_SKIP)"		# Camera
+			register "usb2_ports[9]" = "USB2_PORT_MID(OC_SKIP)"		# Bluetooth
+			# USB3
+			register "usb3_ports[0]" = "USB3_PORT_DEFAULT(OC_SKIP)"		# Type-A port 1
+			register "usb3_ports[1]" = "USB3_PORT_DEFAULT(OC_SKIP)"		# 4G
+			register "usb3_ports[2]" = "USB3_PORT_DEFAULT(OC_SKIP)"		# Type-C port 3
+			register "usb3_ports[3]" = "USB3_PORT_DEFAULT(OC_SKIP)"		# USB Board port 4
+			register "usb3_ports[4]" = "USB3_PORT_EMPTY"			# Used by TBT
+			register "usb3_ports[5]" = "USB3_PORT_EMPTY"			# Used by TBT
+		end
+		device pci 14.1 off end # USB xDCI (OTG)
+		device pci 14.3 on      # CNVi wifi
+			chip drivers/wifi/generic
+				register "wake" = "PME_B0_EN_BIT"
+				device generic 0 on end
+			end
+		end
+		device pci 14.5 off end # SDCard
+		device pci 15.0 on  end # I2C #0
+		device pci 15.1 off end # I2C #1
+		device pci 15.2 off end # I2C #2
+		device pci 15.3 off end # I2C #3
+		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 Redirection
+		device pci 16.4 off end # Management Engine Interface 3
+		device pci 16.5 off end # Management Engine Interface 4
+		device pci 17.0 on      # SATA
+			register "SataPortsEnable[0]" = "1"
+			register "SataPortsEnable[2]" = "1"
+		end
+		device pci 19.0 off end # I2C #4
+		device pci 19.1 off end # I2C #5
+		device pci 19.2 on  end # UART #2
+		device pci 1a.0 off end # eMMC
+		device pci 1c.0 on  end # PCI Express Port 1
+		device pci 1c.1 off end # PCI Express Port 2
+		device pci 1c.2 off end # PCI Express Port 3
+		device pci 1c.3 off end # PCI Express Port 4
+		device pci 1c.4 on      # PCI Express Port 5
+			# PCI Express Root port #5 x4, Clock 4 (TBT)
+			register "PcieRpEnable[4]" = "1"
+			register "PcieRpLtrEnable[4]" = "1"
+			register "PcieRpHotPlug[4]" = "1"
+			register "PcieClkSrcUsage[4]" = "4"
+			register "PcieClkSrcClkReq[4]" = "4"
+		end
+		device pci 1c.5 off end # PCI Express Port 6
+		device pci 1c.6 off end # PCI Express Port 7
+		device pci 1c.7 off end # PCI Express Port 8
+		device pci 1d.0 on      # PCI Express Port 9
+			# PCI Express Root port #9 x1, Clock 3 (LAN)
+			register "PcieRpEnable[8]" = "1"
+			register "PcieRpLtrEnable[8]" = "1"
+			register "PcieClkSrcUsage[3]" = "8"
+			register "PcieClkSrcClkReq[3]" = "3"
+		end
+		device pci 1d.1 on      # PCI Express Port 10
+			# PCI Express Root port #10 x1, Clock 2 (WLAN)
+			register "PcieRpEnable[9]" = "1"
+			register "PcieRpLtrEnable[9]" = "0"
+			register "PcieClkSrcUsage[2]" = "9"
+			register "PcieClkSrcClkReq[2]" = "2"
+		end
+		device pci 1d.2 off end # PCI Express Port 11
+		device pci 1d.3 off end # PCI Express Port 12
+		device pci 1d.4 on      # PCI Express Port 13
+			# PCI Express Root port #13 x4, Clock 5 (NVMe)
+			register "PcieRpEnable[12]" = "1"
+			register "PcieRpLtrEnable[12]" = "1"
+			register "PcieClkSrcUsage[5]" = "12"
+			register "PcieClkSrcClkReq[5]" = "5"
+		end
+		device pci 1d.5 off end # PCI Express Port 14
+		device pci 1d.6 off end # PCI Express Port 15
+		device pci 1d.7 off end # PCI Express Port 16
+		device pci 1e.0 off end # UART #0
+		device pci 1e.1 off end # UART #1
+		device pci 1e.2 off end # GSPI #0
+		device pci 1e.3 off end # GSPI #1
+		device pci 1f.0 on      # LPC Interface
+			register "gen1_dec" = "0x00040069"
+			register "gen2_dec" = "0x00fc0e01"
+			register "gen3_dec" = "0x00fc0f01"
+			chip drivers/pc80/tpm
+				device pnp 0c31.0 on end
+			end
+		end
+		device pci 1f.1 off end # P2SB
+		device pci 1f.2 hidden end # Power Management Controller
+		device pci 1f.3 on      # Intel HDA
+			register "PchHdaAudioLinkHda" = "1"
+			register "PchHdaAudioLinkDmic0" = "1"
+			register "PchHdaAudioLinkDmic1" = "1"
+		end
+		device pci 1f.4 on  end # SMBus
+		device pci 1f.5 on  end # PCH SPI
+		device pci 1f.6 off end # GbE
+	end
+end
diff --git a/src/mainboard/system76/cml-u/dsdt.asl b/src/mainboard/system76/cml-u/dsdt.asl
new file mode 100644
index 000000000000..982e226118ae
--- /dev/null
+++ b/src/mainboard/system76/cml-u/dsdt.asl
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpi.h>
+DefinitionBlock(
+	"dsdt.aml",
+	"DSDT",
+	ACPI_DSDT_REV_2,
+	OEM_ID,
+	ACPI_TABLE_CREATOR,
+	0x20110725
+)
+{
+	#include <acpi/dsdt_top.asl>
+	#include <soc/intel/common/block/acpi/acpi/platform.asl>
+	#include <soc/intel/common/block/acpi/acpi/globalnvs.asl>
+	#include <cpu/intel/common/acpi/cpu.asl>
+
+	Device (\_SB.PCI0)
+	{
+		#include <soc/intel/common/block/acpi/acpi/northbridge.asl>
+		#include <soc/intel/cannonlake/acpi/southbridge.asl>
+		#include <drivers/intel/gma/acpi/default_brightness_levels.asl>
+	}
+
+	#include <southbridge/intel/common/acpi/sleepstates.asl>
+
+	Scope (\_SB.PCI0.LPCB)
+	{
+		#include <drivers/pc80/pc/ps2_controller.asl>
+	}
+
+	#include "acpi/mainboard.asl"
+}
diff --git a/src/mainboard/system76/cml-u/gpio.c b/src/mainboard/system76/cml-u/gpio.c
new file mode 100644
index 000000000000..e3e4f540a631
--- /dev/null
+++ b/src/mainboard/system76/cml-u/gpio.c
@@ -0,0 +1,218 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <mainboard/gpio.h>
+#include <soc/gpe.h>
+#include <soc/gpio.h>
+
+static const struct pad_config gpio_table[] = {
+	/* ------- GPIO Group GPD ------- */
+	PAD_NC(GPD0, NONE), // PM_BATLOW#
+	PAD_CFG_NF(GPD1, NATIVE, DEEP, NF1), // AC_PRESENT
+	PAD_NC(GPD2, NONE),
+	PAD_CFG_NF(GPD3, UP_20K, DEEP, NF1), // PWR_BTN#
+	PAD_CFG_NF(GPD4, NONE, DEEP, NF1), // SUSB#_PCH
+	PAD_CFG_NF(GPD5, NONE, DEEP, NF1), // SUSC#_PCH
+	PAD_NC(GPD6, NONE),
+	PAD_CFG_GPI(GPD7, NONE, DEEP), // 100k pull up
+	PAD_CFG_NF(GPD8, NONE, DEEP, NF1), // SUS_CLK
+	PAD_NC(GPD9, NONE), // GPD9_RTD3
+	PAD_NC(GPD10, NONE),
+	PAD_NC(GPD11, NONE),
+
+	/* ------- GPIO Group A ------- */
+	PAD_CFG_NF(GPP_A0, NONE, DEEP, NF1), // SB_KBCRST#
+	PAD_CFG_NF(GPP_A1, NATIVE, DEEP, NF1), // LPC_AD0
+	PAD_CFG_NF(GPP_A2, NATIVE, DEEP, NF1), // LPC_AD1
+	PAD_CFG_NF(GPP_A3, NATIVE, DEEP, NF1), // LPC_AD2
+	PAD_CFG_NF(GPP_A4, NATIVE, DEEP, NF1), // LPC_AD3
+	PAD_CFG_NF(GPP_A5, NONE, DEEP, NF1), // LPC_FRAME#
+	PAD_CFG_NF(GPP_A6, NONE, DEEP, NF1), // SERIRQ with 10k pull up
+	PAD_CFG_GPI(GPP_A7, NONE, DEEP), // TPM_PIRQ#
+	PAD_CFG_NF(GPP_A8, NONE, DEEP, NF1), // PM_CLKRUN# with 8.2k pull-up
+	PAD_CFG_NF(GPP_A9, DN_20K, DEEP, NF1), // PCLK_KBC
+	PAD_NC(GPP_A10, NONE),
+	PAD_NC(GPP_A11, NONE),
+	PAD_NC(GPP_A12, NONE), // PCH_GPP_A12
+	PAD_CFG_NF(GPP_A13, NONE, DEEP, NF1), // SUSWARN#
+	PAD_NC(GPP_A14, NONE),
+	PAD_CFG_NF(GPP_A15, UP_20K, DEEP, NF1), // SUS_PWR_ACK
+	PAD_NC(GPP_A16, NONE),
+	PAD_CFG_GPI(GPP_A17, NONE, DEEP), // LIGHT_KB_DET#
+	PAD_NC(GPP_A18, NONE),
+	PAD_CFG_GPO(GPP_A19, 1, DEEP), // SATA_PWR_EN
+	PAD_NC(GPP_A20, NONE),
+	PAD_NC(GPP_A21, NONE),
+	PAD_CFG_GPO(GPP_A22, 0, DEEP), // PS8338B_SW
+	PAD_CFG_GPO(GPP_A23, 0, DEEP), // PS8338B_PCH
+
+	/* ------- GPIO Group B ------- */
+	PAD_NC(GPP_B0, NONE), // CORE_VID0
+	PAD_NC(GPP_B1, NONE), // CORE_VID1
+	PAD_CFG_GPO(GPP_B2, 0, DEEP), // CNVI_WAKE#
+	PAD_NC(GPP_B3, NONE),
+	PAD_NC(GPP_B4, NONE),
+	PAD_NC(GPP_B5, NONE),
+	PAD_NC(GPP_B6, NONE),
+	PAD_CFG_NF(GPP_B7, NONE, DEEP, NF1), // WLAN_CLKREQ#
+	PAD_CFG_NF(GPP_B8, NONE, DEEP, NF1), // LAN_CLKREQ#
+	PAD_CFG_NF(GPP_B9, NONE, DEEP, NF1), // TBT_CLKREQ#
+	PAD_CFG_NF(GPP_B10, NONE, DEEP, NF1), // SSD_CLKREQ#
+	PAD_NC(GPP_B11, NONE), // EXT_PWR_GATE#
+	PAD_CFG_NF(GPP_B12, NONE, DEEP, NF1), // SLP_S0# with 100k pull down
+	PAD_CFG_NF(GPP_B13, NONE, DEEP, NF1), // PLT_RST#
+	PAD_CFG_NF(GPP_B14, NONE, DEEP, NF1), // PCH_SPKR
+	PAD_NC(GPP_B15, NONE),
+	PAD_NC(GPP_B16, NONE), // PCH_GPP_B16
+	PAD_NC(GPP_B17, NONE), // PCH_GPP_B17
+	PAD_NC(GPP_B18, NONE), // PCH_GPP_B18 - strap for disabling no reboot mode
+	PAD_NC(GPP_B19, NONE),
+	PAD_NC(GPP_B20, NONE),
+	PAD_NC(GPP_B21, NONE),
+	PAD_NC(GPP_B22, NONE), // PCH_GPP_B22
+	PAD_NC(GPP_B23, NONE),
+
+	/* ------- GPIO Group C ------- */
+	PAD_CFG_NF(GPP_C0, NONE, DEEP, NF1), // SMB_CLK_DDR
+	PAD_CFG_NF(GPP_C1, NONE, DEEP, NF1), // SMB_DAT_DDR
+	PAD_NC(GPP_C2, NONE), // PCH_GPP_C2 with 4.7k pull-up
+	PAD_NC(GPP_C3, NONE),
+	PAD_NC(GPP_C4, NONE),
+	PAD_NC(GPP_C5, NONE), // PCH_GPP_C5 with 4.7k pull down
+	PAD_CFG_GPI(GPP_C6, NONE, DEEP), // LAN_WAKEUP#
+	PAD_NC(GPP_C7, NONE),
+	PAD_NC(GPP_C8, NONE),
+	_PAD_CFG_STRUCT(GPP_C9, 0x82880100, 0x3000), // TBCIO_PLUG_EVENT
+	PAD_CFG_TERM_GPO(GPP_C10, 0, NONE, PLTRST), // TBT_FRC_PWR
+	PAD_NC(GPP_C11, NONE),
+	PAD_CFG_GPO(GPP_C12, 1, PLTRST), // GPP_C12_RTD3
+	PAD_CFG_GPO(GPP_C13, 1, PLTRST), // SSD_PWR_DN#
+	PAD_CFG_GPO(GPP_C14, 0, PLTRST), // TBTA_HRESET
+	PAD_CFG_GPO(GPP_C15, 1, PLTRST), // TBT_PERST_N
+	PAD_CFG_NF(GPP_C16, NONE, DEEP, NF1), // T_SDA
+	PAD_CFG_NF(GPP_C17, NONE, DEEP, NF1), // T_SCL
+	PAD_NC(GPP_C18, NONE),
+	PAD_NC(GPP_C19, NONE), // SWI# on galp4, NC on darp6
+	PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1), // UART2_RXD
+	PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1), // UART2_TXD
+	PAD_NC(GPP_C22, NONE),
+	PAD_CFG_GPI_APIC_EDGE_LOW(GPP_C23, NONE, PLTRST), // NC on galp4, TP_ATTN# on darp6
+
+	/* ------- GPIO Group D ------- */
+	PAD_NC(GPP_D0, NONE),
+	PAD_NC(GPP_D1, NONE),
+	PAD_NC(GPP_D2, NONE),
+	PAD_NC(GPP_D3, NONE),
+	PAD_NC(GPP_D4, NONE),
+	PAD_NC(GPP_D5, NONE),
+	PAD_NC(GPP_D6, NONE),
+	PAD_NC(GPP_D7, NONE),
+	PAD_CFG_GPO(GPP_D8, 1, DEEP), // SB_BLON
+	_PAD_CFG_STRUCT(GPP_D9, 0x40880100, 0x0000), // SWI#
+	PAD_NC(GPP_D10, NONE),
+	_PAD_CFG_STRUCT(GPP_D11, 0x40880100, 0x3000), // RTD3_PCIE_WAKE#
+	PAD_NC(GPP_D12, NONE), // PCH_GPP_D12
+	PAD_NC(GPP_D13, NONE),
+	PAD_NC(GPP_D14, NONE),
+	PAD_CFG_GPO(GPP_D15, 1, DEEP), // TBT_RTD3_PWR_EN_D15 on galp4, NC on darp6
+	PAD_CFG_GPO(GPP_D16, 1, PWROK), // RTD3_3G_PW R_EN on galp4, NC on darp6
+	PAD_NC(GPP_D17, NONE),
+	PAD_NC(GPP_D18, NONE),
+	PAD_CFG_NF(GPP_D19, NONE, DEEP, NF1), // GPPC_DMIC_CLK
+	PAD_CFG_NF(GPP_D20, NONE, DEEP, NF1), // GPPC_DMIC_DATA
+	PAD_CFG_GPI(GPP_D21, NONE, DEEP), // TPM_DET#
+	PAD_CFG_GPI(GPP_D22, NONE, DEEP), // TPM_TCM_Detect
+	PAD_NC(GPP_D23, NONE),
+
+	/* ------- GPIO Group E ------- */
+	PAD_NC(GPP_E0, NONE), // PCH_GPP_E0 with 10k pull-up
+	PAD_NC(GPP_E1, NONE), // SATA_ODD_PRSNT#
+	PAD_CFG_NF(GPP_E2, UP_20K, DEEP, NF1), // SATAGP2
+	PAD_NC(GPP_E3, NONE),
+	PAD_NC(GPP_E4, NONE),
+	PAD_NC(GPP_E5, NONE),
+	PAD_CFG_NF(GPP_E6, NONE, DEEP, NF1), // DEVSLP2
+	PAD_NC(GPP_E7, NONE),
+	PAD_CFG_NF(GPP_E8, NONE, DEEP, NF1), // PCH_SATAHDD_LED#
+	PAD_NC(GPP_E9, NONE), // GP_BSSB_CLK
+	PAD_NC(GPP_E10, NONE), // GPP_E10
+	PAD_NC(GPP_E11, NONE), // GPP_E11
+	PAD_NC(GPP_E12, NONE), // USB_OC#78
+	PAD_CFG_NF(GPP_E13, NONE, DEEP, NF1), // MUX_HPD
+	PAD_CFG_NF(GPP_E14, NONE, DEEP, NF1), // HDMI_HPD
+	_PAD_CFG_STRUCT(GPP_E15, 0x42840100, 0x0), // SMI#
+	_PAD_CFG_STRUCT(GPP_E16, 0x80880100, 0x0000), // SCI#
+	PAD_CFG_NF(GPP_E17, NONE, DEEP, NF1), // EDP_HPD
+	PAD_CFG_NF(GPP_E18, NONE, DEEP, NF1), // MDP_CTRLCLK
+	PAD_CFG_NF(GPP_E19, NONE, DEEP, NF1), // MDP_CTRLDATA
+	PAD_CFG_NF(GPP_E20, NONE, DEEP, NF1), // HDMI_CTRLCLK
+	PAD_CFG_NF(GPP_E21, NONE, DEEP, NF1), // HDMI_CTRLDATA
+	PAD_NC(GPP_E22, NONE),
+	PAD_NC(GPP_E23, NONE),
+
+	/* ------- GPIO Group F ------- */
+	PAD_CFG_NF(GPP_F0, NONE, DEEP, NF1), // CNVI_GNSS_PA_BLANKING
+	PAD_NC(GPP_F1, NONE),
+	PAD_NC(GPP_F2, NONE),
+	PAD_NC(GPP_F3, NONE),
+	PAD_CFG_NF(GPP_F4, NONE, DEEP, NF1), // CNVI_BRI_DT
+	PAD_CFG_NF(GPP_F5, UP_20K, DEEP, NF1), // CNVI_BRI_RSP
+	PAD_CFG_NF(GPP_F6, NONE, DEEP, NF1), // CNVI_RGI_DT
+	PAD_CFG_NF(GPP_F7, UP_20K, DEEP, NF1), // CNVI_RGI_RSP
+	PAD_CFG_NF(GPP_F8, NONE, DEEP, NF1), // CNVI_MFUART2_RXD
+	PAD_CFG_NF(GPP_F9, NONE, DEEP, NF1), // CNVI_MFUART2_TXD
+	PAD_NC(GPP_F10, NONE),
+	PAD_NC(GPP_F11, NONE),
+	PAD_NC(GPP_F12, NONE),
+	PAD_NC(GPP_F13, NONE),
+	PAD_NC(GPP_F14, NONE),
+	PAD_NC(GPP_F15, NONE),
+	PAD_NC(GPP_F16, NONE),
+	PAD_NC(GPP_F17, NONE),
+	PAD_NC(GPP_F18, NONE),
+	PAD_NC(GPP_F19, NONE),
+	PAD_NC(GPP_F20, NONE),
+	PAD_NC(GPP_F21, NONE),
+	PAD_NC(GPP_F22, NONE),
+	PAD_CFG_GPI(GPP_F23, NONE, DEEP), // A4WP_PRESENT
+
+	/* ------- GPIO Group G ------- */
+	PAD_CFG_GPI(GPP_G0, NONE, DEEP), // EDP_DET
+	PAD_NC(GPP_G1, NONE),
+	PAD_NC(GPP_G2, NONE),
+	PAD_CFG_GPO(GPP_G3, 0, DEEP), // ASM1543_I_SEL0
+	PAD_CFG_GPO(GPP_G4, 0, DEEP), // ASM1543_I_SEL1
+	PAD_NC(GPP_G5, NONE), // BOARD_ID
+	PAD_NC(GPP_G6, NONE),
+	PAD_NC(GPP_G7, NONE), // TBT_Detect
+
+	/* ------- GPIO Group H ------- */
+	PAD_NC(GPP_H0, NONE),
+	PAD_CFG_NF(GPP_H1, NONE, DEEP, NF3), // CNVI_RST#
+	PAD_CFG_NF(GPP_H2, NONE, DEEP, NF3), // CNVI_CLKREQ
+	PAD_NC(GPP_H3, NONE),
+	PAD_NC(GPP_H4, NONE),
+	PAD_NC(GPP_H5, NONE),
+	PAD_NC(GPP_H6, NONE),
+	PAD_NC(GPP_H7, NONE),
+	PAD_NC(GPP_H8, NONE),
+	PAD_NC(GPP_H9, NONE),
+	PAD_NC(GPP_H10, NONE),
+	PAD_NC(GPP_H11, NONE),
+	PAD_NC(GPP_H12, NONE),
+	PAD_NC(GPP_H13, NONE),
+	PAD_NC(GPP_H14, NONE), // G_INT1
+	PAD_NC(GPP_H15, NONE),
+	PAD_NC(GPP_H16, NONE),
+	PAD_NC(GPP_H17, NONE),
+	PAD_CFG_NF(GPP_H18, NONE, DEEP, NF1), // CPU_C10_GATE#
+	PAD_NC(GPP_H19, NONE),
+	PAD_NC(GPP_H20, NONE),
+	PAD_NC(GPP_H21, NONE), // GPPC_H21
+	PAD_CFG_GPO(GPP_H22, 1, DEEP), // TBT_RTD3_PWR_EN_H22
+	PAD_NC(GPP_H23, NONE), // WIGIG_PEWAKE on galp4, NC on darp6
+};
+
+void mainboard_configure_gpios(void)
+{
+	gpio_configure_pads(gpio_table, ARRAY_SIZE(gpio_table));
+}
diff --git a/src/mainboard/system76/cml-u/gpio_early.c b/src/mainboard/system76/cml-u/gpio_early.c
new file mode 100644
index 000000000000..80f37c65535e
--- /dev/null
+++ b/src/mainboard/system76/cml-u/gpio_early.c
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <mainboard/gpio.h>
+#include <soc/gpio.h>
+
+static const struct pad_config early_gpio_table[] = {
+	PAD_CFG_NF(GPP_C20, NONE, DEEP, NF1), // UART2_RXD
+	PAD_CFG_NF(GPP_C21, NONE, DEEP, NF1), // UART2_TXD
+};
+
+void mainboard_configure_early_gpios(void)
+{
+	gpio_configure_pads(early_gpio_table, ARRAY_SIZE(early_gpio_table));
+}
diff --git a/src/mainboard/system76/cml-u/include/mainboard/gpio.h b/src/mainboard/system76/cml-u/include/mainboard/gpio.h
new file mode 100644
index 000000000000..c6393beebb6d
--- /dev/null
+++ b/src/mainboard/system76/cml-u/include/mainboard/gpio.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef MAINBOARD_GPIO_H
+#define MAINBOARD_GPIO_H
+
+void mainboard_configure_early_gpios(void);
+void mainboard_configure_gpios(void);
+
+#endif
diff --git a/src/mainboard/system76/cml-u/ramstage.c b/src/mainboard/system76/cml-u/ramstage.c
new file mode 100644
index 000000000000..43ee54f50a5f
--- /dev/null
+++ b/src/mainboard/system76/cml-u/ramstage.c
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/device.h>
+#include <mainboard/gpio.h>
+
+static void mainboard_init(void *chip_info)
+{
+	mainboard_configure_gpios();
+}
+
+struct chip_operations mainboard_ops = {
+	.init = mainboard_init,
+};
diff --git a/src/mainboard/system76/cml-u/romstage.c b/src/mainboard/system76/cml-u/romstage.c
new file mode 100644
index 000000000000..1cd82c64913b
--- /dev/null
+++ b/src/mainboard/system76/cml-u/romstage.c
@@ -0,0 +1,24 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <soc/cnl_memcfg_init.h>
+#include <soc/romstage.h>
+
+static const struct cnl_mb_cfg memcfg = {
+	.spd[0] = {
+		.read_type = READ_SMBUS,
+		.spd_spec = {.spd_smbus_address = 0xa0},
+	},
+	.spd[2] = {
+		.read_type = READ_SMBUS,
+		.spd_spec = {.spd_smbus_address = 0xa4},
+	},
+	.rcomp_resistor = { 121, 81, 100 },
+	.rcomp_targets = { 100, 40, 20, 20, 26 },
+	.dq_pins_interleaved = 1,
+	.vref_ca_config = 2,
+};
+
+void mainboard_memory_init_params(FSPM_UPD *memupd)
+{
+	cannonlake_memcfg_init(&memupd->FspmConfig, &memcfg);
+}
diff --git a/src/mainboard/system76/cml-u/variants/galp4/board_info.txt b/src/mainboard/system76/cml-u/variants/galp4/board_info.txt
new file mode 100644
index 000000000000..f1f061fd9208
--- /dev/null
+++ b/src/mainboard/system76/cml-u/variants/galp4/board_info.txt
@@ -0,0 +1 @@
+Board name: galp4
diff --git a/src/mainboard/system76/cml-u/variants/galp4/data.vbt b/src/mainboard/system76/cml-u/variants/galp4/data.vbt
new file mode 100644
index 000000000000..d70c3fbb5937
--- /dev/null
+++ b/src/mainboard/system76/cml-u/variants/galp4/data.vbt
diff --git a/src/mainboard/system76/cml-u/variants/galp4/hda_verb.c b/src/mainboard/system76/cml-u/variants/galp4/hda_verb.c
new file mode 100644
index 000000000000..1b04604bb194
--- /dev/null
+++ b/src/mainboard/system76/cml-u/variants/galp4/hda_verb.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <device/azalia_device.h>
+
+const u32 cim_verb_data[] = {
+	/* Realtek ALC293 */
+	0x10ec0293, /* Vendor ID */
+	0x15581403, /* Subsystem ID */
+	12, /* Number of entries */
+	AZALIA_SUBVENDOR(0, 0x15581403),
+	AZALIA_PIN_CFG(0, 0x12, 0x90a60130),
+	AZALIA_PIN_CFG(0, 0x13, 0x40000000),
+	AZALIA_PIN_CFG(0, 0x14, 0x90170110),
+	AZALIA_PIN_CFG(0, 0x15, 0x02211020),
+	AZALIA_PIN_CFG(0, 0x16, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x18, 0x02a11040),
+	AZALIA_PIN_CFG(0, 0x19, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1a, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1b, 0x411111f0),
+	AZALIA_PIN_CFG(0, 0x1d, 0x41738205),
+	AZALIA_PIN_CFG(0, 0x1e, 0x411111f0),
+};
+
+const u32 pc_beep_verbs[] = {};
+
+AZALIA_ARRAY_SIZES;
diff --git a/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb b/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb
new file mode 100644
index 000000000000..f6c61498be39
--- /dev/null
+++ b/src/mainboard/system76/cml-u/variants/galp4/overridetree.cb
@@ -0,0 +1,8 @@
+chip soc/intel/cannonlake
+	device domain 0 on
+		subsystemid 0x1558 0x1403 inherit
+		device pci 15.0 on
+			# I2C HID not supported on galp4
+		end # I2C #0
+	end
+end