[M] Change in coreboot[master]: soc/intel/common/block/oc_wdt: Add OC watchdog common block

[Michał Żygowski (Code Review)]

Attention is currently required from: Nico Huber, Martin L Roth, Benjamin Doron, Michał Kopeć, Angel Pons, Maximilian Brune, Arthur Heymans, Werner Zeh.

Hello build bot (Jenkins), Nico Huber, Benjamin Doron, Paul Menzel, Michał Kopeć, Maximilian Brune, Angel Pons, Arthur Heymans, Werner Zeh,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/68944

to look at the new patch set (#16).

Change subject: soc/intel/common/block/oc_wdt: Add OC watchdog common block
......................................................................

soc/intel/common/block/oc_wdt: Add OC watchdog common block

Add new block for handling overcloking watchdog. The watchdog is
present since Skylake or maybe even earlier so it is safe to use with
most of the microarchitectures utilizing intelblocks.

The patch adds the common block for initializing and feeding the
watchdog. Timeout is configurable via Kconfig and cannot be set to
less than 60 seconds to avoid reset loops when full memory training
is needed.

The patch also adds support for feeding watchdog in driverless mode,
i.e. it utilizies periodic SMI to reload the timeout value and restart
the watchdog timer. This is optional and selectable by Kconfig option
as well. If the option is not enabled, payload and/or software must
ensure to keep feeding the watchdog, otherwise the platform will
reset.

TEST=Enable watchdog on MSI PRO Z690-A and see the platform resets
after some time. Enable the watchdog in driverless mode and see the
platform no longer resets and periodic SMI keeps feeding the watchdog.

Signed-off-by: Michał Żygowski 
Change-Id: Ib494aa0c7581351abca8b496fc5895b2c7cbc5bc
---
A src/soc/intel/common/block/include/intelblocks/oc_wdt.h
A src/soc/intel/common/block/oc_wdt/Kconfig
A src/soc/intel/common/block/oc_wdt/Makefile.inc
A src/soc/intel/common/block/oc_wdt/oc_wdt.c
M src/soc/intel/common/block/smm/smihandler.c
M src/soc/intel/common/block/smm/smm.c
6 files changed, 187 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/44/68944/16