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--0-477159123-969108527=:16423
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Hi folks,

The current driver for the Zilog 8530 serial chip and its derivatives is
only partially machine independent, despite most of its guts being in
/sys/dev/ic/z8530*.

The problem is that it can only have one type of "parent" zsc device,
namely the native parent for each NetBSD platform which uses it. That
interface is currently defined in <machine/z8530var.h> and is very
specific to how the zs chip is wired up on each platform's hardware.

So, along comes a VMEbus board with a bunch of Z8530 chips whose registers
are directly mapped onto the bus. With the current state of the zs driver,
there's no way I can write MI VMEbus glue to make it work. Not to mention
the ports which can have a VMEbus attached, but don't have
<machine/z8530var.h> ...

My plan is to put a __BROKEN_ZS_DRIVER_ATTACHMENT define in the
<machine/types.h> file of each port which currently has a
<machine/z8530var.h>, and modify the zs driver to conditionally present
the original not-quite-MI attachment interface or a new proper-MI
interface depending on this #define. (Note: alpha and sgimips have a
<machine/z8530var.h> header file, but don't seem to use the driver!)

None of the original functionality will be lost with the new interface.
Specifically, there will be MI versions of zs_read_{reg,csr,data} and
zs_write_{reg,csr,data} which will insert the optional delay between
accesses. The only problem I could see with this was the mipsco port; it
seems to do a dummy read of another hardware register as well as a delay.
I'm not sure how to fix this one right now...

Other slightly oddball platforms are mac68k and macppc. These have CTS
wired up backwards and need to flip the status bit in the CSR to
compensate. I've added a flag to the MI code to take this into account.

I plan to make the mvme68k port use the new interface, leaving it up to
individual port-masters to update their code when they have time.

Since this driver seems to be used on at least 11 platforms, comments
would be appreciated before I break^W commit it. ;-)

The diffs for the stuff in sys/dev/ic/z8530* are attached since they're
not excessively big. The diffs for mvme68k's MD part are in:

	ftp://ftp.netbsd.org/pub/NetBSD/arch/mvme68k/md_zs_diffs

Cheers, Steve


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