PCI: dwc: Add CONFIG_PCIE_DW_HOST to enable PCI dwc host

Now that PCI designware host has a separate file, add a new PCIE_DW_HOST
config symbol to select the host-only driver. This will enable to
independently select host support and endpoint support (when it's added).
Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

drivers/pci/dwc/Kconfig

@@ -3,13 +3,17 @@ menu "DesignWare PCI Core Support"
 
 config PCIE_DW
 	bool
+
+config PCIE_DW_HOST
+        bool
 	depends on PCI_MSI_IRQ_DOMAIN
+        select PCIE_DW
 
 config PCI_DRA7XX
 	bool "TI DRA7xx PCIe controller"
 	depends on OF && HAS_IOMEM && TI_PIPE3
 	depends on PCI_MSI_IRQ_DOMAIN
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	 Enables support for the PCIe controller in the DRA7xx SoC.  There
 	 are two instances of PCIe controller in DRA7xx.  This controller can
@@ -18,7 +22,7 @@ config PCI_DRA7XX
 config PCIE_DW_PLAT
 	bool "Platform bus based DesignWare PCIe Controller"
 	depends on PCI_MSI_IRQ_DOMAIN
-	select PCIE_DW
+	select PCIE_DW_HOST
 	---help---
 	 This selects the DesignWare PCIe controller support. Select this if
 	 you have a PCIe controller on Platform bus.
@@ -32,21 +36,21 @@ config PCI_EXYNOS
 	depends on SOC_EXYNOS5440
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 
 config PCI_IMX6
 	bool "Freescale i.MX6 PCIe controller"
 	depends on SOC_IMX6Q
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 
 config PCIE_SPEAR13XX
 	bool "STMicroelectronics SPEAr PCIe controller"
 	depends on ARCH_SPEAR13XX
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here if you want PCIe support on SPEAr13XX SoCs.
 
@@ -55,7 +59,7 @@ config PCI_KEYSTONE
 	depends on ARCH_KEYSTONE
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here if you want to enable PCI controller support on Keystone
 	  SoCs. The PCI controller on Keystone is based on Designware hardware
@@ -67,7 +71,7 @@ config PCI_LAYERSCAPE
 	depends on OF && (ARM || ARCH_LAYERSCAPE)
 	depends on PCI_MSI_IRQ_DOMAIN
 	select MFD_SYSCON
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here if you want PCIe controller support on Layerscape SoCs.
 
@@ -76,7 +80,7 @@ config PCI_HISI
 	bool "HiSilicon Hip05 and Hip06 SoCs PCIe controllers"
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here if you want PCIe controller support on HiSilicon
 	  Hip05 and Hip06 SoCs
@@ -86,7 +90,7 @@ config PCIE_QCOM
 	depends on ARCH_QCOM && OF
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here to enable PCIe controller support on Qualcomm SoCs. The
 	  PCIe controller uses the Designware core plus Qualcomm-specific
@@ -97,7 +101,7 @@ config PCIE_ARMADA_8K
 	depends on ARCH_MVEBU
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here if you want to enable PCIe controller support on
 	  Armada-8K SoCs. The PCIe controller on Armada-8K is based on
@@ -109,7 +113,7 @@ config PCIE_ARTPEC6
 	depends on MACH_ARTPEC6
 	depends on PCI_MSI_IRQ_DOMAIN
 	select PCIEPORTBUS
-	select PCIE_DW
+	select PCIE_DW_HOST
 	help
 	  Say Y here to enable PCIe controller support on Axis ARTPEC-6
 	  SoCs.  This PCIe controller uses the DesignWare core.

drivers/pci/dwc/Makefile

-obj-$(CONFIG_PCIE_DW) += pcie-designware.o pcie-designware-host.o
+obj-$(CONFIG_PCIE_DW) += pcie-designware.o
+obj-$(CONFIG_PCIE_DW_HOST) += pcie-designware-host.o
 obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o
 obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
 obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o

drivers/pci/dwc/pcie-designware.h

@@ -161,10 +161,6 @@ struct dw_pcie {
 
 int dw_pcie_read(void __iomem *addr, int size, u32 *val);
 int dw_pcie_write(void __iomem *addr, int size, u32 val);
-irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
-void dw_pcie_msi_init(struct pcie_port *pp);
-void dw_pcie_setup_rc(struct pcie_port *pp);
-int dw_pcie_host_init(struct pcie_port *pp);
 
 u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg);
 void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val);
@@ -174,4 +170,29 @@ void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
 			       int type, u64 cpu_addr, u64 pci_addr,
 			       u32 size);
 void dw_pcie_setup(struct dw_pcie *pci);
+
+#ifdef CONFIG_PCIE_DW_HOST
+irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
+void dw_pcie_msi_init(struct pcie_port *pp);
+void dw_pcie_setup_rc(struct pcie_port *pp);
+int dw_pcie_host_init(struct pcie_port *pp);
+#else
+static inline irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
+{
+	return IRQ_NONE;
+}
+
+static inline void dw_pcie_msi_init(struct pcie_port *pp)
+{
+}
+
+static inline void dw_pcie_setup_rc(struct pcie_port *pp)
+{
+}
+
+static inline int dw_pcie_host_init(struct pcie_port *pp)
+{
+	return 0;
+}
+#endif
 #endif /* _PCIE_DESIGNWARE_H */