[parisc-linux] HIL_BASE ("finding" devices)

[Philipp Rumpf]

On Sun, Mar 12, 2000 at 03:52:52PM -0500, Brian S. Julin wrote:
> I've only just really started to hack at the HIL driver, but
> one thing I noticed off the bat is that the HIL_BASE defined
> in hil.h is 0xf0821000 while the device base listed when 
> I boot for the HIL is 0xf0201000.  This probably means it 
> varies across different models.

It probably does.   AFAIK, the HIL driver is pretty much a hack
Matthew did to get his 715's keyboard working (the 715 and keyboard
are here now and Matthew is in Ottawa, and I don't have it set up
so didn't work on the driver).

> Optimally I suppose the best thing would be to somehow 
> find the device -- the code that prints out the hardware 
> found seems to get strings from the "pdc" which I glean is
> the "BIOS".  I suppose the only thing the HIL will have that
> is unique is this string, or are there model invariant 
> numbers like the PCI fn?

There are indeed, hversion and sversion are the words you're looking
for.  See the register_driver for the current (broken IMHO) interface.

> Alternatively I suppose we could do what the alpha folk
> have done and have a compile-time selection of the system type
> (e.g. "avanti") which sets the values for various things like that.

No way.  The "machine vector" concept wouldn't work well for us - it
works for ppc and alpha because those machines usually have a relatively
limited number of setups - with most chipsets, you can only use one CPU
type;  Lasi is used with PA7100LC, PA7300LC, PA8000, PA8200, and PA8500,
and shares code with the PA7100 (?) version (ASP) as well.  Furthermore
PDC device detection is sane to a certain extent - a lot of devices PDC
doesn't tell us about though.

	Philipp Rumpf