system76-coreboot/src/mainboard/system76/gaze16/devicetree.cb

chip soc/intel/tigerlake
	register "common_soc_config" = "{
		.chipset_lockdown = CHIPSET_LOCKDOWN_COREBOOT,
		// Touchpad I2C bus
		.i2c[0] = {
			.speed = I2C_SPEED_FAST,
			.rise_time_ns = 80,
			.fall_time_ns = 110,
		},
	}"

# ACPI (soc/intel/tigerlake/acpi.c)
	# Enable Enhanced Intel SpeedStep
	register "eist_enable" = "1"

# CPU (soc/intel/tigerlake/cpu.c)
	# Power limits
	register "power_limits_config[POWER_LIMITS_H_8_CORE]" = "{
		// /sys/class/powercap/intel-rapl:0/constraint_0_power_limit_uw
		.tdp_pl1_override = 45,
		// /sys/class/powercap/intel-rapl:0/constraint_1_power_limit_uw
		.tdp_pl2_override = 109,
	}"
	register "power_limits_config[POWER_LIMITS_H_6_CORE]" = "{
		// /sys/class/powercap/intel-rapl:0/constraint_0_power_limit_uw
		.tdp_pl1_override = 45,
		// /sys/class/powercap/intel-rapl:0/constraint_1_power_limit_uw
		.tdp_pl2_override = 109,
	}"

# Finalize (soc/intel/tigerlake/finalize.c)
	# PM Timer Disabled, saves power
	register "PmTimerDisabled" = "1"

# FSP Memory (soc/intel/tigerlake/romstage/fsp_params.c)
	# Enable C6 DRAM
	register "enable_c6dram" = "1"

# FSP Silicon (soc/intel/tigerlake/fsp_params.c)
	# Acoustic settings
	register "AcousticNoiseMitigation" = "1"
	register "SlowSlewRate[VR_DOMAIN_IA]" = "SLEW_FAST_8"
	register "SlowSlewRate[VR_DOMAIN_GT]" = "SLEW_FAST_8"
	register "SlowSlewRate[VR_DOMAIN_SA]" = "SLEW_FAST_8"
	register "SlowSlewRate[VR_DOMAIN_VLCC]" = "SLEW_FAST_8"
	register "FastPkgCRampDisable[VR_DOMAIN_IA]" = "1"
	register "FastPkgCRampDisable[VR_DOMAIN_GT]" = "1"
	register "FastPkgCRampDisable[VR_DOMAIN_SA]" = "1"
	register "FastPkgCRampDisable[VR_DOMAIN_VLCC]" = "1"

	# FIVR configuration
	#   Read EXT_RAIL_CONFIG to determine bitmaps
	#     sudo devmem2 0xfe0011b8
	#     0x0
	#   Read EXT_V1P05_VR_CONFIG
	#     sudo devmem2 0xfe0011c0
	#     0x1a42000
	#   Read EXT_VNN_VR_CONFIG0
	#     sudo devmem2 0xfe0011c4
	#     0x1a42000
	# TODO: v1p05 voltage and vnn icc max?
	register "ext_fivr_settings" = "{
		.configure_ext_fivr = 1,
		.v1p05_enable_bitmap = 0,
		.vnn_enable_bitmap = 0,
		.v1p05_supported_voltage_bitmap = 0,
		.vnn_supported_voltage_bitmap = 0,
		.v1p05_icc_max_ma = 500,
		.vnn_sx_voltage_mv = 1050,
	}"

	# Read LPM_EN, make sure to invert the bits
	# sudo devmem2 0xfe001c78
	# 0x9
	register "LpmStateDisableMask" = "
		LPM_S0i2_1 |
		LPM_S0i2_2 |
		LPM_S0i3_1 |
		LPM_S0i3_2 |
		LPM_S0i3_3 |
		LPM_S0i3_4
	"

	# Thermal
	# rdmsr --bitfield 31:24 --decimal 0x1A2
	register "tcc_offset" = "8"

# PM Util (soc/intel/tigerlake/pmutil.c)
	# GPE configuration
	# sudo devmem2 0xfe001920 (pmc_bar + GPIO_GPE_CFG)
	# 0x432
	register "pmc_gpe0_dw0" = "PMC_GPP_R"
	register "pmc_gpe0_dw1" = "PMC_GPP_B"
	register "pmc_gpe0_dw2" = "PMC_GPP_D"

# Actual device tree
	device cpu_cluster 0 on
		device lapic 0 on end
	end

	device domain 0 on
		#From CPU EDS(575683)
		device ref system_agent on end
		device ref igpu on
			# DDIA is eDP
			register "DdiPortAConfig" = "1"
			register "DdiPortAHpd" = "1"
			register "DdiPortADdc" = "0"

			# DDIB is HDMI
			register "DdiPortBConfig" = "0"
			register "DdiPortBHpd" = "1"
			register "DdiPortBDdc" = "1"

			register "gfx" = "GMA_STATIC_DISPLAYS(0)"
		end
		device ref dptf on
			register "Device4Enable" = "1"
		end
		device ref gna on end

		# From PCH EDS(615985)
		device ref cnvi_bt on end
		device ref shared_ram on end
		device ref cnvi_wifi on
			chip drivers/wifi/generic
				register "wake" = "GPE0_PME_B0"
				device generic 0 on end
			end
		end
		device ref i2c0 on
			# Touchpad I2C bus
			register "SerialIoI2cMode[PchSerialIoIndexI2C0]" = "PchSerialIoPci"
			chip drivers/i2c/hid
				register "generic.hid" = ""ELAN0412""
				register "generic.desc" = ""ELAN Touchpad""
				register "generic.irq_gpio" = "ACPI_GPIO_IRQ_LEVEL_LOW(GPP_R12)"
				register "generic.probed" = "1"
				register "hid_desc_reg_offset" = "0x01"
				device i2c 15 on end
			end
		end
		device ref heci1 on
			#TODO Disable ME and HECI
			register "HeciEnabled" = "1"
		end
		device ref uart2 on
			# Debug console
			register "SerialIoUartMode[PchSerialIoIndexUART2]" = "PchSerialIoSkipInit"
		end
		device ref pch_espi on
			# LPC configuration from lspci -s 1f.0 -xxx
			# Address 0x84: Decode 0x80 - 0x8F (Port 80)
			register "gen1_dec" = "0x000c0081"
			# Address 0x88: Decode 0x68 - 0x6F (PMC)
			register "gen2_dec" = "0x00040069"
			# Address 0x8C: Decode 0xE00 - 0xEFF (AP/EC command)
			register "gen3_dec" = "0x00fc0E01"
			# Address 0x90: Decode 0xF00 - 0xFFF (AP/EC debug)
			register "gen4_dec" = "0x00fc0F01"
			# LPC TPM
			chip drivers/pc80/tpm
				device pnp 0c31.0 on end
			end
		end
		device ref p2sb on end
		device ref pmc hidden end
		device ref hda on
			register "PchHdaAudioLinkHdaEnable" = "1"
		end
		device ref smbus on
			register "SmbusEnable" = "1"
		end
		device ref fast_spi on end
	end
end