From: Ralf Baechle <ralf@linux-mips.org>

Forward port of the 2.4 driver with changes required for 2.6.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>