[Bug 199013] Add ID for StarTech.com PCIe RS232 Serial Adapter Card

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199013

            Bug ID: 199013
           Summary: Add ID for StarTech.com PCIe RS232 Serial Adapter Card
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mlsemon35 at gmail.com

Created attachment 154983
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=154983&action=edit
Add ID for Moschip chipset on StarTech.com serial adaper card PEX2S553

Hi!  I bought a StarTech.com PCIe 2-port serial adapter card, Part # PEX2S553. 
I couldn't get it to work with the scc(4) driver.  Thinking it was a matter of
not knowing what serial driver to use--scc? puc? uart?--I grepped around the
latest svn pull of 10.1-RELEASE until I found sys/dev/uart/uart_bus_pci.c.  I
adapted one of the MosChip entries and provide it as a patch.  This card indeed
uses the scc(4) driver.

Serial sessions work fine, and the PPS is supported by this card.  I can have
one port at 4800 baud and the other port at 115200 baud.  Looks good and my
Garmin GPS18-LVC performs over it continuously, performing much like it did on
x86 with standard motherboard serial ports.  IOW, it works for every way I
would normally use the serial port, no traps or other issues noted by the
kernel.  I did have issue trying to interrupt a process of doing a `cat
/dev/ttyu3` while piping /dev/urandom from the other end of the serial cable,
but that's been the only trouble spot (solved by clean reboot).

The instructions claim that this card is a Moschip MCS9922CV-AA chipset.

No other alterations have been required, and I wouldn't know how to make such
modifications.

dmesg shows this on boot:

uart2: <MosChip MCS9922 PCIe to Peripheral Controller> port 0xdcf0-0xdcf7 mem
0xdfdfc000-0xdfdfcfff,0xdfdfd000-0xdfdfdfff irq 17 at device 0.0 on pci2
uart3: <MosChip MCS9922 PCIe to Peripheral Controller> port 0xdcf8-0xdcff mem
0xdfdfe000-0xdfdfefff,0xdfdff000-0xdfdfffff irq 18 at device 0.1 on pci2

Thanks!

Michael

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