Patches to fix aty128fb and xf400 r128 to work with both Rage128 and Rage128Pros

[Kevin Hendricks <khendricks@ivey.uwo.ca>]

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Hi Kostas,

With lots of help from Ben, we were able to figure out that the OF values used
to initialize the Rage128 and Rage128Pro cards are the same ones used by the
MacOS and that we can actually read the X_MPLL_REF_FB_DIV value, the XCLK_CNTL,
and PLL_REF_DIV values and calculate the proper XCLK.  In a similar way you can
calculate the MCLK value too so you can get or calculate almost all of the same
info as is probed from the Bios under x86 machines.

This allows both machines with G3s, and G4 (even with the Rage 128 cards) to
work with the same aty128fb.c kernel driver without any table lookups.

The patch to add this to the aty128fb.c is attached.  I have also used
similar code to replace the bios code probe for powerpc in the r128_driver.c for
xf400. The patch to do that is also attached.

These patches have been tested and work fine on my B+W G3 rev 2, my brand new
G4 with Rage128Pro card, and on Ben's older G4 with the non-pro card.

We still need to test this on a B+W G3 revision 1 just to be complete (but Ben
will do that soon).

Assuming they test out fine, Kostas would you see about getting the r128 patch
integrated into the next xf40X release while I see about getting Paul and/or
Anthony to integrate the aty128fb.c patch into both the stable and development
kernels.

Hopefully with these in place, new G4s will work as well as older G4s
and G3s.

Thanks!!!

Kevin


--
Kevin B. Hendricks
Associate Professor of Operations and Information Technology
Richard Ivey School of Business, University of Western Ontario
London, Ontario  N6A-3K7  CANADA
khendricks@ivey.uwo.ca, (519) 661-3874, fax: 519-661-3959


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