Attention is currently required from: Marek Maślanka, Michał Żygowski, Subrata Banik.

Marek Maślanka uploaded patch set #12 to this change.

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The following approvals got outdated and were removed: Verified+1 by build bot (Jenkins)

soc/intel/common/block: Add support for watchdog

Implement watchdog for intel based platform by filling ACPI Watchdog
Action Table (WDAT) table.
The WDAT ACPI table encompasses essential watchdog functions, including:
- Setting and retrieving countdown/timeout values
- Starting and stopping the watchdog
- Pinging the watchdog
- Retrieving the cause of the last reboot, whether it was triggered by
the watchdog or another reason

The general purpose register TCO_MESSAGE1 stores the reason for the most
recent reboot rather than the original register TCO2_STS. This is
because the firmware must clear TCO2_STS, and it can't be reused for
storing this information for the operating system.

The watchdog is designed for use by the OS through certain defined
actions in the WDAT table. It relies on the ACPI Power Management Timer,
which may result in an increase in power consumption.

BUG=b:314260167
TEST=Enable CONFIG_ACPI_WDAT_WDT and CONFIG_USE_PM_ACPI_TIMER in the
config. Enable CONFIG_WDAT_WDT in the kernel config. Build and deploy
both firmware and kernel to the device. Trigger the watchdog by
performing the command: “cat > /dev/watchdog”. Wait approximately 30
seconds for the watchdog to reset the device.

Change-Id: Iaf7971f8407920a553fd91d2ed04193c882e08f1
Signed-off-by: Marek Maslanka <mmaslanka@google.com>
---
M src/soc/intel/common/block/acpi/acpi.c
M src/soc/intel/common/block/include/intelblocks/tco.h
M src/soc/intel/common/block/smbus/tco.c
3 files changed, 149 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/09/79909/12

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