Review: 16746 asy: improve PCI(e) device support

[Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>]

Hi,

please review this change to asy(4D):

https://code.illumos.org/c/illumos-gate/+/3660
https://www.illumos.org/issues/16746

This is the first of three patches to make asy(4D) usable on modern PCIe
UART chips. It attaches asy(4D) to the correct PCI device class and
allows it to work on PCIe devices instead of PCI only.

I didn't want to outright rip out the few bits of code in there that
deal with the quirks of a particular PCI modem chipset, the only PCI
device supported by asy(4D) to this date, but I had to rewrite them so
they don't affect any other PCI(e) devices.

As that stuff is completely untested and pretty much untestable for me
apart from verifying it doesn't break other devices, and since I don't
believe anyone has been using this kind of hardware in the past two
decades or is likely to do so in the foreseeable future, I can be very
easily persuaded to just garbage-collect that old cruft, just as I did
with the code dealing with the same quirks of the same chipset on a ISA
bus.


Thanks,
Hans


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