mmc: tmio: split core functionality, DMA and MFD glue

TMIO MMC chips contain an SD / SDIO IP core from Panasonic, similar to
the one, used in MN5774 and other MN57xx controllers. These IP cores are
included in many multifunction devices, in sh-mobile chips from Renesas,
in the latter case they can also use DMA. Some sh-mobile implementations
also have some other specialities, that MFD-based solutions don't have.
This makes supporting all these features in a monolithic driver inconveniet
and error-prone. This patch splits the driver into 3 parts: the core,
the MFD glue and the DMA support. In case of a modular build, two modules
will be built: mmc_tmio_core and mmc_tmio.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 1a21c64..4d16166 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -439,9 +439,13 @@
 	  To compile this driver as a module, choose M here: the
 	  module will be called sdricoh_cs.
 
+config MMC_TMIO_CORE
+	tristate
+
 config MMC_TMIO
 	tristate "Toshiba Mobile IO Controller (TMIO) MMC/SD function support"
 	depends on MFD_TMIO || MFD_ASIC3 || MFD_SH_MOBILE_SDHI
+	select MMC_TMIO_CORE
 	help
 	  This provides support for the SD/MMC cell found in TC6393XB,
 	  T7L66XB and also HTC ASIC3