The code in pmac_low_i2c.c is a low level synchronous version of the i2c keywest
driver for use by platform code early during boot or during sleep/wakeup cycles
to communicate with some motherboard chips, typically clock chips.
It wasn't used on g5 until now, which is good because it wasn't 64 bits clean :)

This patch fixes it, and also remove the use of udelay() since it can be used for
synchronizing the HW timebase, and so must operate when it's frozen (and our
implementation of udelay uses that timebase).
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>