mb/hp/z220_series: Convert z220_sff_workstation into variant

No functional change, just refactoring to make room for CMT variant.

Built with BUILD_TIMELESS=1 and no config included before and after.
	$ diff master.rom build/coreboot.rom
	$

TESTED: boots to SeaBIOS on HP Z220 SFF

Flashed bios region internally, mainboard also has FDO
(flash descriptor override) jumper that allows r/w to whole flash.

Change-Id: I6aaac75216b2d7c8bb48801454ce616ace3b1422
Signed-off-by: Damien Zammit <damien@zamaudio.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62808
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/hp/z220_series/Kconfig

@@ -1,7 +1,5 @@
-if BOARD_HP_Z220_SFF_WORKSTATION
-
-config BOARD_SPECIFIC_OPTIONS
-	def_bool y
+config BOARD_HP_Z220_SERIES_COMMON
+	def_bool n
 	select BOARD_ROMSIZE_KB_16384
 	select HAVE_ACPI_RESUME
 	select HAVE_ACPI_TABLES
@@ -20,6 +18,11 @@ config BOARD_SPECIFIC_OPTIONS
 	select GFX_GMA_ANALOG_I2C_HDMI_B
 	select MAINBOARD_USES_IFD_GBE_REGION
 
+config BOARD_HP_Z220_SFF_WORKSTATION
+	select BOARD_HP_Z220_SERIES_COMMON
+
+if BOARD_HP_Z220_SERIES_COMMON
+
 config VBOOT
 	select VBOOT_VBNV_CMOS
 	select VBOOT_NO_BOARD_SUPPORT
@@ -36,10 +39,19 @@ config CBFS_SIZE
 	default 0x570000
 
 config MAINBOARD_DIR
-	default "hp/z220_sff_workstation"
+	default "hp/z220_series"
+
+config VARIANT_DIR
+	default "z220_sff_workstation" if BOARD_HP_Z220_SFF_WORKSTATION
 
 config MAINBOARD_PART_NUMBER
-	default "HP Z220 SFF Workstation"
+	default "HP Z220 SFF Workstation" if BOARD_HP_Z220_SFF_WORKSTATION
+
+config OVERRIDE_DEVICETREE
+	default "variants/\$(CONFIG_VARIANT_DIR)/overridetree.cb"
+
+config INTEL_GMA_VBT_FILE
+	default "src/mainboard/\$(MAINBOARDDIR)/data.vbt"
 
 config DRAM_RESET_GATE_GPIO
 	int

src/mainboard/hp/z220_series/Makefile.inc

@@ -1,5 +1,5 @@
-bootblock-y += gpio.c
-romstage-y += gpio.c
+bootblock-y += variants/$(VARIANT_DIR)/gpio.c
+romstage-y += variants/$(VARIANT_DIR)/gpio.c
 ramstage-$(CONFIG_MAINBOARD_USE_LIBGFXINIT) += gma-mainboard.ads
 bootblock-y += early_init.c
 romstage-y += early_init.c

src/mainboard/hp/z220_series/devicetree.cb

@@ -30,7 +30,6 @@ chip northbridge/intel/sandybridge
 			register "pcie_hotplug_map" = "{ 0, 0, 0, 0, 0, 0, 0, 0 }"
 			register "pcie_port_coalesce" = "true"
 			register "sata_interface_speed_support" = "0x3"
-			register "sata_port_map" = "0xf"
 			register "spi_lvscc" = "0x2005"
 			register "spi_uvscc" = "0x2005"
 

src/mainboard/hp/z220_series/variants/z220_sff_workstation/overridetree.cb

@@ -0,0 +1,12 @@
+## SPDX-License-Identifier: GPL-2.0-only
+
+chip northbridge/intel/sandybridge
+	device domain 0 on
+		subsystemid 0x103c 0x1791 inherit
+
+		chip southbridge/intel/bd82x6x
+			register "sata_port_map" = "0xf"
+			device pci 1c.4 on  end	# dummy setting
+		end
+	end
+end