superio/nuvoton: Add support for NPCD378

The NPCD378 can be found on at least:
* HP Compaq 8200
* HP Compaq 8300

The datasheet is not publicly available, as HP implements lots of
custom hardware. Add basic support for it, based on HP Compaq 8200.
The first eight LDNs seem to be standard nuvoton compatible, except for
LDN4, which is used to control front LED and power in ACPI S3.

LDN8 provides access to HP's proprietary HWM which is accessiable at the LDN's
IOBASE with a size of 0x100 bytes.
The HWM consists of 16 pages with each holding 0xff bytes. The pages can be
selected by writing the page index to IOBASE + 0xff.

TODO:
Reverse engineer the HWM to support fan control.

WARNING:
The remaining LDNs have been guessed and might be wrong!

The serial has been tested and is working.

Change-Id: Ib497fd41b88e9c159eeeffa69bc2bfdccee9cb38
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/25384
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/superio/nuvoton/npcd378/Makefile.inc b/src/superio/nuvoton/npcd378/Makefile.inc
new file mode 100644
index 0000000000..ca0c824cdd
--- /dev/null
+++ b/src/superio/nuvoton/npcd378/Makefile.inc
@@ -0,0 +1,17 @@
+##
+## This file is part of the coreboot project.
+##
+## Copyright (C) 2018 Patrick Rudolph <siro@das-labor.org>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 2 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+ramstage-$(CONFIG_SUPERIO_NUVOTON_NPCD378) += superio.c