USB: xHCI: Add stack support for xHCI

	This adds stack layer for extensible Host Controller Interface
	which facilitates use of USB 3.0 in host mode.

	Adapting xHCI host controller driver in linux-kernel
	by Sarah Sharp to needs in u-boot.

	This adds the basic xHCI host controller driver with bare minimum
	features:
	- Control/Bulk transfer support has been added with required
	infrastructure for necessary xHC data structures.
	- Stream protocol hasn't been supported yet.
	- No support for quirky devices has been added.

	Signed-off-by: Vikas C Sajjan <vikas.sajjan@samsung.com>
	Signed-off-by: Julius Werner <jwerner@chromium.org>
	Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>

Change-Id: I51a1515a97fbd978e12383af7776d493d4778eb1
Signed-off-by: Vivek Gautam <gautam.vivek@samsung.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/3502
Tested-by: Star_Automation <star@marvell.com>
Reviewed-by: Eli Nidam <elini@marvell.com>
Reviewed-by: Omri Itach <omrii@marvell.com>
Tested-by: Omri Itach <omrii@marvell.com>
7 files changed