3d9c3161e3
The change is based on public documents listed below as well as Linux changes and the code developed by Kostik. The documents: - Intel® C620 Series Chipset Platform Controller Hub Datasheet - Intel® 100 Series and Intel® C230 Series Chipset Family Platform Controller Hub (PCH) Datasheet - Volume 2 of 2 Interesting Linux commits: -9424693035-2a7a0e9bf7The peculiarity of the new chipsets is that the watchdog resources are configured in PCI registers of SMBus controller and Power Management function as opposed to the LPC bridge. I took a simplistic approach of querying the resources from the respective PCI devices. ichwd is still a device on isa bus. The PCI devices are found by their slot and function defined in the datasheets as siblings of the upstream LPC bridge. There are some shortcuts and missing features. First of all, I have not implemented the functionality required to clear the no-reboot bit. That would require writing to a special PCI configuration register of a hidden / invisible PCI device after which the device would start responding to accesses to other registers. The no-reboot bit was not set on my test hardware, so I decided to leave its handling for the later time. Also, I did not try to handle the case where the watchdog resources are not configured by the hardware as well as the case where ACPI defined operational region conflicts with the watchdog resources. My test system did not have either of those problem, so, again, I decided to leave those cases until later. See this Linux commit for some details of the ACPI problem:a7ae81952cFinally, I have added only the PCI ID found on my test system. I think that more IDs can be added as the change gets tested. Tested on Dell PowerEdge R740. PR: 222079 Reviewed by: mav, kib MFC after: 3 weeks Relnotes: maybe Sponsored by: Panzura Differential Revision: https://reviews.freebsd.org/D17585
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