mainboard/lenovo/x230: Add ThinkPad x230s as a variant

The code is based on autoport and that for X230. Major differences are:
    - Only one DDR3 slot
    - HM77 PCH
    - M.2 socket instead of mini pci-e
    - no docking
    - no tpm

Tested:
    - CPU i5-3337U
    - Slotted DIMM 8GiB
    - Camera
    - pci-e and usb2 on M.2 slot with A key for wlan
    - sata and usb2  (no superspeed components) on M.2 slot with B key for wwan
    - On board SDHCI connected to pci-e
    - USB3 ports
    - libgfxinit-based graphic init
    - NVRAM options for North and South bridges
    - Sound
    - Thinkpad EC
    - S3
    - Linux 4.9 within Debian GNU/Linux stable, loaded from
      Seabios.

Untested:
    - Touch screen, which is said to work under ubuntu but not debian.

Change-Id: Ie537645d5ffaee799e79af2f821f80c3ebd2dfec
Signed-off-by: Bill XIE <persmule@hardenedlinux.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41168
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/mainboard/lenovo/x230/variants/x230s/overridetree.cb b/src/mainboard/lenovo/x230/variants/x230s/overridetree.cb
new file mode 100644
index 0000000000..ed1dd3c3b4
--- /dev/null
+++ b/src/mainboard/lenovo/x230/variants/x230s/overridetree.cb
@@ -0,0 +1,36 @@
+chip northbridge/intel/sandybridge
+	# Enable DisplayPort Hotplug with 6ms pulse
+	register "gpu_dp_b_hotplug" = "4"
+	register "gpu_dp_c_hotplug" = "4"
+	register "gpu_dp_d_hotplug" = "4"
+
+	# Enable Panel as eDP and configure power delays
+	register "gpu_panel_port_select" = "1"			# eDP
+	register "gpu_panel_power_backlight_off_delay" = "1"	# 0.1ms
+	register "gpu_panel_power_backlight_on_delay" = "1"	# 0.1ms
+	register "gpu_panel_power_down_delay" = "500" 		# 50ms
+	register "gpu_panel_power_up_delay" = "2000"		# 200ms
+
+	device domain 0x0 on
+		subsystemid 0x17aa 0x2209 inherit
+		chip southbridge/intel/bd82x6x # Intel Series 6 Cougar Point PCH
+			register "c2_latency" = "0x0065"
+			# X230s does not support docking
+			register "docking_supported" = "0"
+			register "pcie_hotplug_map" = "{ 0, 0, 0, 0, 0, 0, 0, 0 }"
+			# Enable SATA ports 0 (HDD bay) & 1 (WWAN M.2 SATA)
+			register "sata_port_map" = "0x3"
+
+			device pci 1f.0 on # LPC bridge
+				chip ec/lenovo/h8 #
+					register "config1" = "0x05"
+					register "config3" = "0xc4"
+					register "event5_enable" = "0x3c"
+					register "evente_enable" = "0x1d"
+					# X230s only has BT on wlan card
+					register "has_bdc_detection" = "0"
+				end
+			end # LPC Controller
+		end
+	end
+end