[PATCH] macsonic/jazzsonic network drivers update

The purpose of this patch:

- Adopt the DMA API (jazzsonic, macsonic & core driver).

- Adopt the driver model (macsonic).

This part was cribbed from jazzsonic. As a consequence, macsonic once
again works as a module. Driver model is also used by the DMA calls.

- Support 16 bit cards (macsonic & core driver, also affects jazzsonic)

This code was adapted from the mac68k linux 2.2 kernel, where it has
languished for a long time.

- Support more 32-bit mac cards (macsonic)

Also from mac68k repo.

- Zero-copy buffer handling (core driver)

Provides a nice performance improvement. The new algorithm incidentally
helped to replace the old Jazz DMA code.

The patch was tested on a variety of macs (several 32-bit quadra built-in
NICs, a 16-bit LC PDS NIC and a 16-bit comm-slot NIC), and also on MIPS
Jazz.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

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