Use of ioremap() causes build failure on S390.
Restrict the driver to ARM until another architecture comes along
and enables the driver for its own use.
Signed-off-by: NMarc Zyngier <maz@misterjones.org>
Signed-off-by: NWim Van Sebroeck <wim@iguana.be>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>