mainboard/lenovo: Add ThinkCentre M710s (Skylake)

The processor may be a Pentium or 6/7th generation Core i3/i5/i7.
This port was tested on an i5-7400.

Working:
 - Can boot Ubuntu 22.04.1 (Linux 6.5.0) using payloads:
   - SeaBIOS
   - TianoCore EDK 2
 - Internal flashing (from coreboot)
 - PEG
 - PCIe
 - SATA
 - M.2 SSD
 - M.2 WLAN (+ Bluetooth)
 - LAN
 - USB
 - Memory card reader
 - CPU fan
 - VGA (DP bridge)
 - Display ports
 - Audio (output)
 - COM1
 - TPM

Not Working:
 - SuperIO related things
 - Power button LED
 - PCIe clock related things and AER issues (LiveCD)
 - Some drm issue when using EDK 2 and libgfxinit (LiveCD)
 - ME cleaner

Untested:
 - Audio (input)

Won't Test:
 - COM2 header
 - LPT header
 - PS/2 keyboard and mouse

Thanks to Nico Huber and everyone else on the IRC for helping me write
my first port!

Change-Id: I551753aecfbd2c0ee57d85bb22cb943eb21af3cc
Signed-off-by: Nicholas Sudsgaard <devel+coreboot@nsudsgaard.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80343
Reviewed-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 15 insertions, 0 deletions

diff --git a/src/mainboard/lenovo/thinkcentre_m710s/bootblock.c b/src/mainboard/lenovo/thinkcentre_m710s/bootblock.c
new file mode 100644
index 0000000000..061b5446cf
--- /dev/null
+++ b/src/mainboard/lenovo/thinkcentre_m710s/bootblock.c
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <bootblock_common.h>
+#include <superio/ite/common/ite.h>
+#include <superio/ite/it8629e/it8629e.h>
+
+#define SERIAL_DEV PNP_DEV(0x2e, IT8629E_SP1)
+#define GPIO_DEV   PNP_DEV(0x2e, IT8629E_GPIO)
+
+void bootblock_mainboard_early_init(void)
+{
+	ite_reg_write(GPIO_DEV, 0x23, 0x49);
+	ite_reg_write(GPIO_DEV, 0x71, 0x09);
+	ite_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
+}