PCI: rockchip: Add Rockchip DW PCIe controller support

1. Add support for DW PCIe controller found on RK1808 SoC platform
2. Add support PCIe udma transfer

Change-Id: Ic6d638782d1f55f965d663f73eee14bafa392740
Signed-off-by: Simon Xue <xxm@rock-chips.com>

drivers/pci/controller/Kconfig

@@ -220,7 +220,7 @@ config PCIE_ROCKCHIP_HOST
 
 config ROCKCHIP_PCIE_DMA_OBJ
 	bool "Rockchip PCIe uDMA transfer support"
-	depends on PCIE_ROCKCHIP_HOST
+	depends on PCIE_ROCKCHIP_HOST || PCIE_DW_ROCKCHIP
 	default n
 	help
 	  Say y to enable p2p DMA transfer between PCIe components.

drivers/pci/controller/dwc/Kconfig

@@ -82,6 +82,15 @@ config PCIE_DW_PLAT_EP
 	  order to enable device-specific features PCI_DW_PLAT_EP must be
 	  selected.
 
+config PCIE_DW_ROCKCHIP
+	bool "Rockchip DesignWare PCIe controller"
+	select PCIE_DW
+	select PCIE_DW_HOST
+	depends on ARCH_ROCKCHIP
+	depends on OF
+	help
+	  Enables support for the DW PCIe controller in the Rockchip SoC.
+
 config PCI_EXYNOS
 	bool "Samsung Exynos PCIe controller"
 	depends on SOC_EXYNOS5440 || COMPILE_TEST

drivers/pci/controller/dwc/Makefile

@@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
 obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
 obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
+obj-$(CONFIG_PCIE_DW_ROCKCHIP) += pcie-dw-rockchip.o
 
 # The following drivers are for devices that use the generic ACPI
 # pci_root.c driver but don't support standard ECAM config access.