arcnet: com20020-pci: handle backplane mode depending on card type

We read the backplane mode of each subcard from bits 2 and 3 of the misc
register.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed