Here is a patch to support the M32R SIO (serial IO) driver.

This driver supports the M32R serial ports.
- Supports two types M32R serial interfaces; M32R_SIO and M32R_PLDSIO.
- With SMP safeness.

Currently the M32R_PLDSIO serial interface, which is implemented on a PLD
on the M3T-M32700UT evaluation board, has slightly different specification
from the integrated peripheral SIO (M32R_SIO).  Now we can select them by
CONFIG_ option.

It is a serial-core based driver, based on drivers/serial/8250.c.  Any
comments or suggestions will be appreciated.
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>