usb: host: add xhci-exynos driver

This driver is for Samsung Exynos xhci host conroller. It uses xhci-plat
driver mainly and extends some functions by xhci hooks and overrides.

It supports USB Audio offload with Co-processor. It only cares DCBAA,
Device Context, Transfer Ring, Event Ring, and ERST. They are allocated
on specific address with xhci hooks. Co-processor could use them directly
without xhci driver after then.

Signed-off-by: Daehwan Jung <dh10.jung@samsung.com>

drivers/usb/host/Kconfig

@@ -104,6 +104,14 @@ config USB_XHCI_TEGRA
 	  Say 'Y' to enable the support for the xHCI host controller
 	  found in NVIDIA Tegra124 and later SoCs.
 
+config USB_XHCI_EXYNOS
+	tristate "xHCI support for Samsung Exynos SoC Series"
+	depends on USB_XHCI_PLATFORM
+	depends on ARCH_EXYNOS || COMPILE_TEST
+	help
+	  Say 'Y' to enable the support for the xHCI host controller
+	  found in Samsung Exynos SoCs.
+
 endif # USB_XHCI_HCD
 
 config USB_EHCI_BRCMSTB

drivers/usb/host/Makefile

@@ -86,3 +86,4 @@ obj-$(CONFIG_USB_HCD_SSB)	+= ssb-hcd.o
 obj-$(CONFIG_USB_FOTG210_HCD)	+= fotg210-hcd.o
 obj-$(CONFIG_USB_MAX3421_HCD)	+= max3421-hcd.o
 obj-$(CONFIG_USB_XEN_HCD)	+= xen-hcd.o
+obj-$(CONFIG_USB_XHCI_EXYNOS)	+= xhci-exynos.o