ARM: Add Gemini architecture v3

Adds support for Cortina Systems Gemini family CPUs:
http://www.cortina-systems.com/products/category/18

v3:
- fixed __io(a) to be defined as __typesafe_io(a)

v2:
- #include <asm/io.h> -> <linux/io.h>
- remove asm/system.h include
- revorked mm.c to use named initializers
- removed "empty" dma.h
- updated copyrights

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
diff --git a/arch/arm/mach-gemini/Kconfig b/arch/arm/mach-gemini/Kconfig
new file mode 100644
index 0000000..3aff39a
--- /dev/null
+++ b/arch/arm/mach-gemini/Kconfig
@@ -0,0 +1,12 @@
+if ARCH_GEMINI
+
+menu "Cortina Systems Gemini Implementations"
+
+endmenu
+
+config GEMINI_MEM_SWAP
+	bool "Gemini memory is swapped"
+	help
+	  Say Y here if Gemini memory is swapped by bootloader.
+
+endif