PCI: xgene: Convert to use generic config accessors

Convert the xgene host PCI driver to use the generic config access
functions.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Tanmay Inamdar <tinamdar@apm.com>
CC: linux-arm-kernel@lists.infradead.org

drivers/pci/host/pci-xgene.c

@@ -74,92 +74,6 @@ static inline u32 pcie_bar_low_val(u32 addr, u32 flags)
 	return (addr & PCI_BASE_ADDRESS_MEM_MASK) | flags;
 }
 
-/* PCIe Configuration Out/In */
-static inline void xgene_pcie_cfg_out32(void __iomem *addr, int offset, u32 val)
-{
-	writel(val, addr + offset);
-}
-
-static inline void xgene_pcie_cfg_out16(void __iomem *addr, int offset, u16 val)
-{
-	u32 val32 = readl(addr + (offset & ~0x3));
-
-	switch (offset & 0x3) {
-	case 2:
-		val32 &= ~0xFFFF0000;
-		val32 |= (u32)val << 16;
-		break;
-	case 0:
-	default:
-		val32 &= ~0xFFFF;
-		val32 |= val;
-		break;
-	}
-	writel(val32, addr + (offset & ~0x3));
-}
-
-static inline void xgene_pcie_cfg_out8(void __iomem *addr, int offset, u8 val)
-{
-	u32 val32 = readl(addr + (offset & ~0x3));
-
-	switch (offset & 0x3) {
-	case 0:
-		val32 &= ~0xFF;
-		val32 |= val;
-		break;
-	case 1:
-		val32 &= ~0xFF00;
-		val32 |= (u32)val << 8;
-		break;
-	case 2:
-		val32 &= ~0xFF0000;
-		val32 |= (u32)val << 16;
-		break;
-	case 3:
-	default:
-		val32 &= ~0xFF000000;
-		val32 |= (u32)val << 24;
-		break;
-	}
-	writel(val32, addr + (offset & ~0x3));
-}
-
-static inline void xgene_pcie_cfg_in32(void __iomem *addr, int offset, u32 *val)
-{
-	*val = readl(addr + offset);
-}
-
-static inline void xgene_pcie_cfg_in16(void __iomem *addr, int offset, u32 *val)
-{
-	*val = readl(addr + (offset & ~0x3));
-
-	switch (offset & 0x3) {
-	case 2:
-		*val >>= 16;
-		break;
-	}
-
-	*val &= 0xFFFF;
-}
-
-static inline void xgene_pcie_cfg_in8(void __iomem *addr, int offset, u32 *val)
-{
-	*val = readl(addr + (offset & ~0x3));
-
-	switch (offset & 0x3) {
-	case 3:
-		*val = *val >> 24;
-		break;
-	case 2:
-		*val = *val >> 16;
-		break;
-	case 1:
-		*val = *val >> 8;
-		break;
-	}
-	*val &= 0xFF;
-}
-
 /*
  * When the address bit [17:16] is 2'b01, the Configuration access will be
  * treated as Type 1 and it will be forwarded to external PCIe device.
@@ -213,69 +127,23 @@ static bool xgene_pcie_hide_rc_bars(struct pci_bus *bus, int offset)
 	return false;
 }
 
-static int xgene_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
-				  int offset, int len, u32 *val)
-{
-	struct xgene_pcie_port *port = bus->sysdata;
-	void __iomem *addr;
-
-	if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	if (xgene_pcie_hide_rc_bars(bus, offset)) {
-		*val = 0;
-		return PCIBIOS_SUCCESSFUL;
-	}
-
-	xgene_pcie_set_rtdid_reg(bus, devfn);
-	addr = xgene_pcie_get_cfg_base(bus);
-	switch (len) {
-	case 1:
-		xgene_pcie_cfg_in8(addr, offset, val);
-		break;
-	case 2:
-		xgene_pcie_cfg_in16(addr, offset, val);
-		break;
-	default:
-		xgene_pcie_cfg_in32(addr, offset, val);
-		break;
-	}
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-static int xgene_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
-				   int offset, int len, u32 val)
+static int xgene_pcie_map_bus(struct pci_bus *bus, unsigned int devfn,
+			      int offset)
 {
 	struct xgene_pcie_port *port = bus->sysdata;
-	void __iomem *addr;
 
-	if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up)
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	if (xgene_pcie_hide_rc_bars(bus, offset))
-		return PCIBIOS_SUCCESSFUL;
+	if ((pci_is_root_bus(bus) && devfn != 0) || !port->link_up ||
+	    xgene_pcie_hide_rc_bars(bus, offset))
+		return NULL;
 
 	xgene_pcie_set_rtdid_reg(bus, devfn);
-	addr = xgene_pcie_get_cfg_base(bus);
-	switch (len) {
-	case 1:
-		xgene_pcie_cfg_out8(addr, offset, (u8)val);
-		break;
-	case 2:
-		xgene_pcie_cfg_out16(addr, offset, (u16)val);
-		break;
-	default:
-		xgene_pcie_cfg_out32(addr, offset, val);
-		break;
-	}
-
-	return PCIBIOS_SUCCESSFUL;
+	return xgene_pcie_get_cfg_base(bus);
 }
 
 static struct pci_ops xgene_pcie_ops = {
-	.read = xgene_pcie_read_config,
-	.write = xgene_pcie_write_config
+	.map_bus = xgene_pcie_map_bus,
+	.read = pci_generic_config_read32,
+	.write = pci_generic_config_write32,
 };
 
 static u64 xgene_pcie_set_ib_mask(void __iomem *csr_base, u32 addr,