diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 6d4dd22..f5e75d2 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -113,6 +113,8 @@ config ARCH_VEXPRESS
 	  Express).
 
 config ARCH_XGENE
+	select PCI
+	select PCI_DOMAINS
 	bool "AppliedMicro X-Gene SOC Family"
 	help
 	  This enables support for AppliedMicro X-Gene SOC Family
@@ -124,6 +126,23 @@ menu "Bus support"
 config ARM_AMBA
 	bool
 
+config PCI
+	bool "PCI support"
+	help
+	  Find out whether you have a PCI motherboard. PCI is the name of a
+	  bus system, i.e. the way the CPU talks to the other stuff inside
+	  your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
+	  VESA. If you have PCI, say Y, otherwise N.
+
+config PCI_DOMAINS
+	bool
+	depends on PCI
+
+config PCI_SYSCALL
+	def_bool PCI
+
+source "drivers/pci/Kconfig"
+source "drivers/pci/pcie/Kconfig"
 endmenu
 
 menu "Kernel Features"
diff --git a/arch/arm64/include/asm/dma.h b/arch/arm64/include/asm/dma.h
new file mode 100644
index 0000000..c597e2a
--- /dev/null
+++ b/arch/arm64/include/asm/dma.h
@@ -0,0 +1,18 @@
+/*
+ * Based on linux/arch/arm/include/asm/dma.h
+ */
+#ifndef __ASM_ARM_DMA_H
+#define __ASM_ARM_DMA_H
+
+/*
+ * This is the maximum virtual address which can be DMA'd from.
+ */
+#define MAX_DMA_ADDRESS	(~0ULL)
+
+#ifdef CONFIG_PCI
+extern int isa_dma_bridge_buggy;
+#else
+#define isa_dma_bridge_buggy    (0)
+#endif
+
+#endif /* __ASM_ARM_DMA_H */
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h
index 4cc813e..eb3ebe1 100644
--- a/arch/arm64/include/asm/io.h
+++ b/arch/arm64/include/asm/io.h
@@ -118,10 +118,27 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 #define writeq(v,c)		({ __iowmb(); writeq_relaxed((v),(c)); })
 
 /*
+ * A typesafe __io() helper
+ */
+static inline void __iomem *__typesafe_io(unsigned long addr)
+{
+	return (void __iomem *)addr;
+}
+
+/*
  *  I/O port access primitives.
  */
-#define IO_SPACE_LIMIT		0xffff
 #define PCI_IOBASE		((void __iomem *)(MODULES_VADDR - SZ_2M))
+#if defined(CONFIG_PCI)
+#define IO_SPACE_LIMIT  ((resource_size_t)0xffffffff)
+#define __io(a)         __typesafe_io((unsigned long)PCI_IOBASE + \
+				      ((a) & IO_SPACE_LIMIT))
+#else
+#define __io(a)         __typesafe_io((a) & IO_SPACE_LIMIT)
+#endif
+extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
+extern void ioport_unmap(void __iomem *addr);
+extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr);
 
 static inline u8 inb(unsigned long addr)
 {
diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h
new file mode 100644
index 0000000..2233651
--- /dev/null
+++ b/arch/arm64/include/asm/pci.h
@@ -0,0 +1,74 @@
+/*
+ * Based on arch/arm/include/asm/pci.h
+ */
+#ifndef ASMARM_PCI_H
+#define ASMARM_PCI_H
+
+#ifdef __KERNEL__
+#include <asm-generic/pci-dma-compat.h>
+#include <asm-generic/pci-bridge.h>
+
+#include <asm/pcibios.h>	/* for pci_sys_data */
+
+extern unsigned long pcibios_min_io;
+#define PCIBIOS_MIN_IO pcibios_min_io
+extern unsigned long pcibios_min_mem;
+#define PCIBIOS_MIN_MEM pcibios_min_mem
+
+static inline int pcibios_assign_all_busses(void)
+{
+	return pci_has_flag(PCI_REASSIGN_ALL_RSRC);
+}
+
+#ifdef CONFIG_PCI_DOMAINS
+static inline int pci_domain_nr(struct pci_bus *bus)
+{
+	struct pci_sys_data *root = bus->sysdata;
+
+	return root->domain;
+}
+
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+	return pci_domain_nr(bus);
+}
+#endif /* CONFIG_PCI_DOMAINS */
+
+static inline void pcibios_penalize_isa_irq(int irq, int active)
+{
+	/* We don't do dynamic PCI IRQ allocation */
+}
+
+/*
+ * The PCI address space does equal the physical memory address space.
+ * The networking and block device layers use this boolean for bounce
+ * buffer decisions.
+ */
+#define PCI_DMA_BUS_IS_PHYS     (1)
+
+#ifdef CONFIG_PCI
+static inline void pci_dma_burst_advice(struct pci_dev *pdev,
+					enum pci_dma_burst_strategy *strat,
+					unsigned long *strategy_parameter)
+{
+	*strat = PCI_DMA_BURST_INFINITY;
+	*strategy_parameter = ~0UL;
+}
+#endif
+
+#define HAVE_PCI_MMAP
+extern int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+			       enum pci_mmap_state mmap_state,
+			       int write_combine);
+
+/*
+ * Dummy implementation; always return 0.
+ */
+static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
+{
+	return 0;
+}
+
+#endif /* __KERNEL__ */
+
+#endif
diff --git a/arch/arm64/include/asm/pcibios.h b/arch/arm64/include/asm/pcibios.h
new file mode 100644
index 0000000..4eda8e2
--- /dev/null
+++ b/arch/arm64/include/asm/pcibios.h
@@ -0,0 +1,98 @@
+/*
+ *  Based on arch/arm/include/asm/mach/pci.h
+ *
+ *  Copyright (C) 2000 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_PCIBIOS_H
+#define __ASM_PCIBIOS_H
+
+#include <linux/ioport.h>
+
+struct pci_sys_data;
+struct pci_ops;
+struct pci_bus;
+struct device;
+
+struct hw_pci {
+#ifdef CONFIG_PCI_DOMAINS
+	int domain;
+#endif
+	struct pci_ops *ops;
+	int nr_controllers;
+	void **private_data;
+	int (*setup) (int nr, struct pci_sys_data *);
+	struct pci_bus *(*scan) (int nr, struct pci_sys_data *);
+	void (*preinit) (void);
+	void (*postinit) (void);
+	 u8(*swizzle) (struct pci_dev *dev, u8 *pin);
+	int (*map_irq) (const struct pci_dev *dev, u8 slot, u8 pin);
+	 resource_size_t(*align_resource) (struct pci_dev *dev,
+					   const struct resource *res,
+					   resource_size_t start,
+					   resource_size_t size,
+					   resource_size_t align);
+	void (*add_bus) (struct pci_bus *bus);
+	void (*remove_bus) (struct pci_bus *bus);
+};
+
+/*
+ * Per-controller structure
+ */
+struct pci_sys_data {
+#ifdef CONFIG_PCI_DOMAINS
+	int domain;
+#endif
+	struct list_head node;
+	int busnr;		/* primary bus number                   */
+	u64 mem_offset;		/* bus->cpu memory mapping offset       */
+	unsigned long io_offset;	/* bus->cpu IO mapping offset   */
+	struct pci_bus *bus;	/* PCI bus                              */
+	struct list_head resources;	/* root bus resources (apertures) */
+	struct resource io_res;
+	char io_res_name[12];
+	/* Bridge swizzling                     */
+	 u8(*swizzle) (struct pci_dev *, u8 *);
+	/* IRQ mapping                          */
+	int (*map_irq) (const struct pci_dev *, u8, u8);
+	/* Resource alignement requirements     */
+	 resource_size_t(*align_resource) (struct pci_dev *dev,
+					   const struct resource *res,
+					   resource_size_t start,
+					   resource_size_t size,
+					   resource_size_t align);
+	void (*add_bus) (struct pci_bus *bus);
+	void (*remove_bus) (struct pci_bus *bus);
+	void *private_data;	/* platform controller private data     */
+};
+
+/*
+ * Call this with your hw_pci struct to initialise the PCI system.
+ */
+void pci_common_init_dev(struct device *, struct hw_pci *);
+
+/*
+ * Compatibility wrapper for older platforms that do not care about
+ * passing the parent device.
+ */
+static inline void pci_common_init(struct hw_pci *hw)
+{
+	pci_common_init_dev(NULL, hw);
+}
+
+/*
+ * Setup early fixed I/O mapping.
+ */
+#if defined(CONFIG_PCI)
+extern void pci_map_io_early(unsigned long pfn);
+#else
+static inline void pci_map_io_early(unsigned long pfn)
+{
+}
+#endif
+
+#endif /* __ASM_PCIBIOS_H */
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 5ba2fd4..9e9c208 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -19,6 +19,7 @@ arm64-obj-$(CONFIG_HW_PERF_EVENTS)	+= perf_event.o
 arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o
 arm64-obj-$(CONFIG_EARLY_PRINTK)	+= early_printk.o
 
+obj-$(CONFIG_PCI)			+= pcibios.o
 obj-y					+= $(arm64-obj-y) vdso/
 obj-m					+= $(arm64-obj-m)
 head-y					:= head.o
diff --git a/arch/arm64/kernel/pcibios.c b/arch/arm64/kernel/pcibios.c
new file mode 100644
index 0000000..810a408
--- /dev/null
+++ b/arch/arm64/kernel/pcibios.c
@@ -0,0 +1,689 @@
+/*
+ *  Based on linux/arch/arm/kernel/bios32.c
+ *
+ *  PCI bios-type initialisation for PCI machines
+ *
+ *  Bits taken from various places.
+ */
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/pci.h>
+
+static int debug_pci;
+
+/*
+ * We can't use pci_find_device() here since we are
+ * called from interrupt context.
+ */
+static void pcibios_bus_report_status(struct pci_bus *bus, u_int status_mask,
+				      int warn)
+{
+	struct pci_dev *dev;
+
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 status;
+
+		/*
+		 * ignore host bridge - we handle
+		 * that separately
+		 */
+		if (dev->bus->number == 0 && dev->devfn == 0)
+			continue;
+
+		pci_read_config_word(dev, PCI_STATUS, &status);
+		if (status == 0xffff)
+			continue;
+
+		if ((status & status_mask) == 0)
+			continue;
+
+		/* clear the status errors */
+		pci_write_config_word(dev, PCI_STATUS, status & status_mask);
+
+		if (warn)
+			printk("(%s: %04X) ", pci_name(dev), status);
+	}
+
+	list_for_each_entry(dev, &bus->devices, bus_list)
+	    if (dev->subordinate)
+		pcibios_bus_report_status(dev->subordinate, status_mask, warn);
+}
+
+void pcibios_report_status(u_int status_mask, int warn)
+{
+	struct list_head *l;
+
+	list_for_each(l, &pci_root_buses) {
+		struct pci_bus *bus = pci_bus_b(l);
+
+		pcibios_bus_report_status(bus, status_mask, warn);
+	}
+}
+
+/*
+ * We don't use this to fix the device, but initialisation of it.
+ * It's not the correct use for this, but it works.
+ * Note that the arbiter/ISA bridge appears to be buggy, specifically in
+ * the following area:
+ * 1. park on CPU
+ * 2. ISA bridge ping-pong
+ * 3. ISA bridge master handling of target RETRY
+ *
+ * Bug 3 is responsible for the sound DMA grinding to a halt.  We now
+ * live with bug 2.
+ */
+static void pci_fixup_83c553(struct pci_dev *dev)
+{
+	/*
+	 * Set memory region to start at address 0, and enable IO
+	 */
+	pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
+			       PCI_BASE_ADDRESS_SPACE_MEMORY);
+	pci_write_config_word(dev, PCI_COMMAND, PCI_COMMAND_IO);
+
+	dev->resource[0].end -= dev->resource[0].start;
+	dev->resource[0].start = 0;
+
+	/*
+	 * All memory requests from ISA to be channelled to PCI
+	 */
+	pci_write_config_byte(dev, 0x48, 0xff);
+
+	/*
+	 * Enable ping-pong on bus master to ISA bridge transactions.
+	 * This improves the sound DMA substantially.  The fixed
+	 * priority arbiter also helps (see below).
+	 */
+	pci_write_config_byte(dev, 0x42, 0x01);
+
+	/*
+	 * Enable PCI retry
+	 */
+	pci_write_config_byte(dev, 0x40, 0x22);
+
+	/*
+	 * We used to set the arbiter to "park on last master" (bit
+	 * 1 set), but unfortunately the CyberPro does not park the
+	 * bus.  We must therefore park on CPU.  Unfortunately, this
+	 * may trigger yet another bug in the 553.
+	 */
+	pci_write_config_byte(dev, 0x83, 0x02);
+
+	/*
+	 * Make the ISA DMA request lowest priority, and disable
+	 * rotating priorities completely.
+	 */
+	pci_write_config_byte(dev, 0x80, 0x11);
+	pci_write_config_byte(dev, 0x81, 0x00);
+
+	/*
+	 * Route INTA input to IRQ 11, and set IRQ11 to be level
+	 * sensitive.
+	 */
+	pci_write_config_word(dev, 0x44, 0xb000);
+	outb(0x08, 0x4d1);
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_83C553,
+			 pci_fixup_83c553);
+
+static void pci_fixup_unassign(struct pci_dev *dev)
+{
+	dev->resource[0].end -= dev->resource[0].start;
+	dev->resource[0].start = 0;
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND2, PCI_DEVICE_ID_WINBOND2_89C940F,
+			 pci_fixup_unassign);
+
+/*
+ * Prevent the PCI layer from seeing the resources allocated to this device
+ * if it is the host bridge by marking it as such.  These resources are of
+ * no consequence to the PCI layer (they are handled elsewhere).
+ */
+static void pci_fixup_dec21285(struct pci_dev *dev)
+{
+	int i;
+
+	if (dev->devfn == 0) {
+		dev->class &= 0xff;
+		dev->class |= PCI_CLASS_BRIDGE_HOST << 8;
+		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+			dev->resource[i].start = 0;
+			dev->resource[i].end = 0;
+			dev->resource[i].flags = 0;
+		}
+	}
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21285,
+			 pci_fixup_dec21285);
+
+/*
+ * PCI IDE controllers use non-standard I/O port decoding, respect it.
+ */
+static void pci_fixup_ide_bases(struct pci_dev *dev)
+{
+	struct resource *r;
+	int i;
+
+	if ((dev->class >> 8) != PCI_CLASS_STORAGE_IDE)
+		return;
+
+	for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+		r = dev->resource + i;
+		if ((r->start & ~0x80) == 0x374) {
+			r->start |= 2;
+			r->end = r->start;
+		}
+	}
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_ide_bases);
+
+/*
+ * Put the DEC21142 to sleep
+ */
+static void pci_fixup_dec21142(struct pci_dev *dev)
+{
+	pci_write_config_dword(dev, 0x40, 0x80000000);
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_DEC, PCI_DEVICE_ID_DEC_21142,
+			 pci_fixup_dec21142);
+
+/*
+ * The CY82C693 needs some rather major fixups to ensure that it does
+ * the right thing.  Idea from the Alpha people, with a few additions.
+ *
+ * We ensure that the IDE base registers are set to 1f0/3f4 for the
+ * primary bus, and 170/374 for the secondary bus.  Also, hide them
+ * from the PCI subsystem view as well so we won't try to perform
+ * our own auto-configuration on them.
+ *
+ * In addition, we ensure that the PCI IDE interrupts are routed to
+ * IRQ 14 and IRQ 15 respectively.
+ *
+ * The above gets us to a point where the IDE on this device is
+ * functional.  However, The CY82C693U _does not work_ in bus
+ * master mode without locking the PCI bus solid.
+ */
+static void pci_fixup_cy82c693(struct pci_dev *dev)
+{
+	if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE) {
+		u32 base0, base1;
+
+		if (dev->class & 0x80) {	/* primary */
+			base0 = 0x1f0;
+			base1 = 0x3f4;
+		} else {	/* secondary */
+			base0 = 0x170;
+			base1 = 0x374;
+		}
+
+		pci_write_config_dword(dev, PCI_BASE_ADDRESS_0,
+				       base0 | PCI_BASE_ADDRESS_SPACE_IO);
+		pci_write_config_dword(dev, PCI_BASE_ADDRESS_1,
+				       base1 | PCI_BASE_ADDRESS_SPACE_IO);
+
+		dev->resource[0].start = 0;
+		dev->resource[0].end = 0;
+		dev->resource[0].flags = 0;
+
+		dev->resource[1].start = 0;
+		dev->resource[1].end = 0;
+		dev->resource[1].flags = 0;
+	} else if (PCI_FUNC(dev->devfn) == 0) {
+		/*
+		 * Setup IDE IRQ routing.
+		 */
+		pci_write_config_byte(dev, 0x4b, 14);
+		pci_write_config_byte(dev, 0x4c, 15);
+
+		/*
+		 * Disable FREQACK handshake, enable USB.
+		 */
+		pci_write_config_byte(dev, 0x4d, 0x41);
+
+		/*
+		 * Enable PCI retry, and PCI post-write buffer.
+		 */
+		pci_write_config_byte(dev, 0x44, 0x17);
+
+		/*
+		 * Enable ISA master and DMA post write buffering.
+		 */
+		pci_write_config_byte(dev, 0x45, 0x03);
+	}
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693,
+			 pci_fixup_cy82c693);
+
+static void pci_fixup_it8152(struct pci_dev *dev)
+{
+	int i;
+	/* fixup for ITE 8152 devices */
+	/* FIXME: add defines for class 0x68000 and 0x80103 */
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST ||
+	    dev->class == 0x68000 || dev->class == 0x80103) {
+		for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+			dev->resource[i].start = 0;
+			dev->resource[i].end = 0;
+			dev->resource[i].flags = 0;
+		}
+	}
+}
+
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_8152,
+			 pci_fixup_it8152);
+
+/*
+ * If the bus contains any of these devices, then we must not turn on
+ * parity checking of any kind.  Currently this is CyberPro 20x0 only.
+ */
+static inline int pdev_bad_for_parity(struct pci_dev *dev)
+{
+	return ((dev->vendor == PCI_VENDOR_ID_INTERG &&
+		 (dev->device == PCI_DEVICE_ID_INTERG_2000 ||
+		  dev->device == PCI_DEVICE_ID_INTERG_2010)) ||
+		(dev->vendor == PCI_VENDOR_ID_ITE &&
+		 dev->device == PCI_DEVICE_ID_ITE_8152));
+
+}
+
+/*
+ * pcibios_fixup_bus - Called after each bus is probed,
+ * but before its children are examined.
+ */
+void pcibios_fixup_bus(struct pci_bus *bus)
+{
+	struct pci_dev *dev;
+	u16 features =
+	    PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_FAST_BACK;
+
+	/*
+	 * Walk the devices on this bus, working out what we can
+	 * and can't support.
+	 */
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 status;
+
+		pci_read_config_word(dev, PCI_STATUS, &status);
+
+		/*
+		 * If any device on this bus does not support fast back
+		 * to back transfers, then the bus as a whole is not able
+		 * to support them.  Having fast back to back transfers
+		 * on saves us one PCI cycle per transaction.
+		 */
+		if (!(status & PCI_STATUS_FAST_BACK))
+			features &= ~PCI_COMMAND_FAST_BACK;
+
+		if (pdev_bad_for_parity(dev))
+			features &= ~(PCI_COMMAND_SERR | PCI_COMMAND_PARITY);
+
+		switch (dev->class >> 8) {
+		case PCI_CLASS_BRIDGE_PCI:
+			pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &status);
+			status |=
+			    PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_MASTER_ABORT;
+			status &=
+			    ~(PCI_BRIDGE_CTL_BUS_RESET |
+			      PCI_BRIDGE_CTL_FAST_BACK);
+			pci_write_config_word(dev, PCI_BRIDGE_CONTROL, status);
+			break;
+
+		case PCI_CLASS_BRIDGE_CARDBUS:
+			pci_read_config_word(dev, PCI_CB_BRIDGE_CONTROL,
+					     &status);
+			status |=
+			    PCI_CB_BRIDGE_CTL_PARITY |
+			    PCI_CB_BRIDGE_CTL_MASTER_ABORT;
+			pci_write_config_word(dev, PCI_CB_BRIDGE_CONTROL,
+					      status);
+			break;
+		}
+	}
+
+	/*
+	 * Now walk the devices again, this time setting them up.
+	 */
+	list_for_each_entry(dev, &bus->devices, bus_list) {
+		u16 cmd;
+
+		pci_read_config_word(dev, PCI_COMMAND, &cmd);
+		cmd |= features;
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+
+		pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
+				      L1_CACHE_BYTES >> 2);
+	}
+
+	/*
+	 * Propagate the flags to the PCI bridge.
+	 */
+	if (bus->self && bus->self->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
+		if (features & PCI_COMMAND_FAST_BACK)
+			bus->bridge_ctl |= PCI_BRIDGE_CTL_FAST_BACK;
+		if (features & PCI_COMMAND_PARITY)
+			bus->bridge_ctl |= PCI_BRIDGE_CTL_PARITY;
+	}
+
+	/*
+	 * Report what we did for this bus
+	 */
+	printk(KERN_INFO "PCI: bus%d: Fast back to back transfers %sabled\n",
+	       bus->number, (features & PCI_COMMAND_FAST_BACK) ? "en" : "dis");
+}
+EXPORT_SYMBOL(pcibios_fixup_bus);
+
+void pcibios_add_bus(struct pci_bus *bus)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	if (sys->add_bus)
+		sys->add_bus(bus);
+}
+
+void pcibios_remove_bus(struct pci_bus *bus)
+{
+	struct pci_sys_data *sys = bus->sysdata;
+	if (sys->remove_bus)
+		sys->remove_bus(bus);
+}
+
+/*
+ * Swizzle the device pin each time we cross a bridge.  If a platform does
+ * not provide a swizzle function, we perform the standard PCI swizzling.
+ *
+ * The default swizzling walks up the bus tree one level at a time, applying
+ * the standard swizzle function at each step, stopping when it finds the PCI
+ * root bus.  This will return the slot number of the bridge device on the
+ * root bus and the interrupt pin on that device which should correspond
+ * with the downstream device interrupt.
+ *
+ * Platforms may override this, in which case the slot and pin returned
+ * depend entirely on the platform code.  However, please note that the
+ * PCI standard swizzle is implemented on plug-in cards and Cardbus based
+ * PCI extenders, so it can not be ignored.
+ */
+static u8 pcibios_swizzle(struct pci_dev *dev, u8 *pin)
+{
+	struct pci_sys_data *sys = dev->sysdata;
+	int slot, oldpin = *pin;
+
+	if (sys->swizzle)
+		slot = sys->swizzle(dev, pin);
+	else
+		slot = pci_common_swizzle(dev, pin);
+
+	if (debug_pci)
+		printk("PCI: %s swizzling pin %d => pin %d slot %d\n",
+			pci_name(dev), oldpin, *pin, slot);
+
+	return slot;
+}
+
+/*
+ * Map a slot/pin to an IRQ.
+ */
+static int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+	struct pci_sys_data *sys = dev->sysdata;
+	int irq = -1;
+
+	if (sys->map_irq)
+		irq = sys->map_irq(dev, slot, pin);
+
+	if (debug_pci)
+		printk("PCI: %s mapping slot %d pin %d => irq %d\n",
+			pci_name(dev), slot, pin, irq);
+
+	return irq;
+}
+
+static int pcibios_init_resources(int busnr, struct pci_sys_data *sys)
+{
+	int ret;
+	struct pci_host_bridge_window *window;
+
+	if (list_empty(&sys->resources)) {
+		pci_add_resource_offset(&sys->resources,
+					&iomem_resource, sys->mem_offset);
+	}
+
+	list_for_each_entry(window, &sys->resources, list) {
+		if (resource_type(window->res) == IORESOURCE_IO)
+			return 0;
+	}
+
+	sys->io_res.start = (busnr * SZ_64K) ? : pcibios_min_io;
+	sys->io_res.end = (busnr + 1) * SZ_64K - 1;
+	sys->io_res.flags = IORESOURCE_IO;
+	sys->io_res.name = sys->io_res_name;
+	sprintf(sys->io_res_name, "PCI%d I/O", busnr);
+
+	ret = request_resource(&ioport_resource, &sys->io_res);
+	if (ret) {
+		pr_err("PCI: unable to allocate I/O port region (%d)\n", ret);
+		return ret;
+	}
+	pci_add_resource_offset(&sys->resources, &sys->io_res, sys->io_offset);
+
+	return 0;
+}
+
+static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
+			    struct list_head *head)
+{
+	struct pci_sys_data *sys = NULL;
+	int ret;
+	int nr, busnr;
+
+	for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
+		sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
+		if (!sys)
+			panic("PCI: unable to allocate sys data!");
+
+#ifdef CONFIG_PCI_DOMAINS
+		sys->domain = hw->domain;
+#endif
+		sys->busnr = busnr;
+		sys->swizzle = hw->swizzle;
+		sys->map_irq = hw->map_irq;
+		sys->align_resource = hw->align_resource;
+		sys->add_bus = hw->add_bus;
+		sys->remove_bus = hw->remove_bus;
+		INIT_LIST_HEAD(&sys->resources);
+
+		if (hw->private_data)
+			sys->private_data = hw->private_data[nr];
+
+		ret = hw->setup(nr, sys);
+
+		if (ret > 0) {
+			ret = pcibios_init_resources(nr, sys);
+			if (ret) {
+				kfree(sys);
+				break;
+			}
+
+			if (hw->scan)
+				sys->bus = hw->scan(nr, sys);
+			else
+				sys->bus = pci_scan_root_bus(parent, sys->busnr,
+							     hw->ops, sys,
+							     &sys->resources);
+
+			if (!sys->bus)
+				panic("PCI: unable to scan bus!");
+
+			busnr = sys->bus->busn_res.end + 1;
+
+			list_add(&sys->node, head);
+		} else {
+			kfree(sys);
+			if (ret < 0)
+				break;
+		}
+	}
+}
+
+void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
+{
+	struct pci_sys_data *sys;
+	LIST_HEAD(head);
+
+	pci_add_flags(PCI_REASSIGN_ALL_RSRC);
+	if (hw->preinit)
+		hw->preinit();
+	pcibios_init_hw(parent, hw, &head);
+	if (hw->postinit)
+		hw->postinit();
+
+	pci_fixup_irqs(pcibios_swizzle, pcibios_map_irq);
+
+	list_for_each_entry(sys, &head, node) {
+		struct pci_bus *bus = sys->bus;
+
+		if (!pci_has_flag(PCI_PROBE_ONLY)) {
+			/*
+			 * Size the bridge windows.
+			 */
+			pci_bus_size_bridges(bus);
+
+			/*
+			 * Assign resources.
+			 */
+			pci_bus_assign_resources(bus);
+		}
+
+		/*
+		 * Tell drivers about devices found.
+		 */
+		pci_bus_add_devices(bus);
+	}
+}
+
+#ifndef CONFIG_PCI_HOST_ITE8152
+void pcibios_set_master(struct pci_dev *dev)
+{
+	/* No special bus mastering setup handling */
+}
+#endif
+
+char *__init pcibios_setup(char *str)
+{
+	if (!strcmp(str, "debug")) {
+		debug_pci = 1;
+		return NULL;
+	} else if (!strcmp(str, "firmware")) {
+		pci_add_flags(PCI_PROBE_ONLY);
+		return NULL;
+	}
+	return str;
+}
+
+/*
+ * From arch/i386/kernel/pci-i386.c:
+ *
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ *
+ * Why? Because some silly external IO cards only decode
+ * the low 10 bits of the IO address. The 0x00-0xff region
+ * is reserved for motherboard devices that decode all 16
+ * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
+ * but we want to try to avoid allocating at 0x2900-0x2bff
+ * which might be mirrored at 0x0100-0x03ff..
+ */
+resource_size_t pcibios_align_resource(void *data, const struct resource *res,
+				       resource_size_t size,
+				       resource_size_t align)
+{
+	struct pci_dev *dev = data;
+	struct pci_sys_data *sys = dev->sysdata;
+	resource_size_t start = res->start;
+
+	if (res->flags & IORESOURCE_IO && start & 0x300)
+		start = (start + 0x3ff) & ~0x3ff;
+
+	start = (start + align - 1) & ~(align - 1);
+
+	if (sys->align_resource)
+		return sys->align_resource(dev, res, start, size, align);
+
+	return start;
+}
+
+/**
+ * pcibios_enable_device - Enable I/O and memory.
+ * @dev: PCI device to be enabled
+ */
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+	u16 cmd, old_cmd;
+	int idx;
+	struct resource *r;
+
+	pci_read_config_word(dev, PCI_COMMAND, &cmd);
+	old_cmd = cmd;
+	for (idx = 0; idx < 6; idx++) {
+		/* Only set up the requested stuff */
+		if (!(mask & (1 << idx)))
+			continue;
+
+		r = dev->resource + idx;
+		if (!r->start && r->end) {
+			printk(KERN_ERR "PCI: Device %s not available because"
+				" of resource collisions\n", pci_name(dev));
+			return -EINVAL;
+		}
+		if (r->flags & IORESOURCE_IO)
+			cmd |= PCI_COMMAND_IO;
+		if (r->flags & IORESOURCE_MEM)
+			cmd |= PCI_COMMAND_MEMORY;
+	}
+
+	/*
+	 * Bridges (eg, cardbus bridges) need to be fully enabled
+	 */
+	if ((dev->class >> 16) == PCI_BASE_CLASS_BRIDGE)
+		cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+
+	if (cmd != old_cmd) {
+		printk("PCI: enabling device %s (%04x -> %04x)\n",
+		       pci_name(dev), old_cmd, cmd);
+		pci_write_config_word(dev, PCI_COMMAND, cmd);
+	}
+	return 0;
+}
+
+int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
+			enum pci_mmap_state mmap_state, int write_combine)
+{
+	struct pci_sys_data *root = dev->sysdata;
+	unsigned long phys;
+
+	if (mmap_state == pci_mmap_io)
+		return -EINVAL;
+	else
+		phys = vma->vm_pgoff + (root->mem_offset >> PAGE_SHIFT);
+
+	/*
+	 * Mark this as IO
+	 */
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	if (remap_pfn_range(vma, vma->vm_start, phys,
+			    vma->vm_end - vma->vm_start, vma->vm_page_prot))
+		return -EAGAIN;
+
+	return 0;
+}
diff --git a/arch/arm64/mm/Makefile b/arch/arm64/mm/Makefile
index b51d364..83edc92 100644
--- a/arch/arm64/mm/Makefile
+++ b/arch/arm64/mm/Makefile
@@ -1,5 +1,5 @@
 obj-y				:= dma-mapping.o extable.o fault.o init.o \
 				   cache.o copypage.o flush.o \
-				   ioremap.o mmap.o pgd.o mmu.o \
+				   ioremap.o iomap.o mmap.o pgd.o mmu.o \
 				   context.o tlb.o proc.o
 obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
diff --git a/arch/arm64/mm/iomap.c b/arch/arm64/mm/iomap.c
new file mode 100644
index 0000000..42585c6
--- /dev/null
+++ b/arch/arm64/mm/iomap.c
@@ -0,0 +1,31 @@
+/*
+ *  Based on linux/arch/arm/mm/iomap.c
+ *
+ * Map IO port and PCI memory spaces so that {read,write}[bwl] can
+ * be used to access this memory.
+ */
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+
+#ifdef __io
+void __iomem *ioport_map(unsigned long port, unsigned int nr)
+{
+	return __io(port);
+}
+EXPORT_SYMBOL(ioport_map);
+
+void ioport_unmap(void __iomem *addr)
+{
+}
+EXPORT_SYMBOL(ioport_unmap);
+#endif
+
+#ifdef CONFIG_PCI
+unsigned long pcibios_min_io = 0x1000;
+EXPORT_SYMBOL(pcibios_min_io);
+
+unsigned long pcibios_min_mem = 0x01000000;
+EXPORT_SYMBOL(pcibios_min_mem);
+#endif
diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c
index 2bb1d58..0c4eeca 100644
--- a/arch/arm64/mm/ioremap.c
+++ b/arch/arm64/mm/ioremap.c
@@ -98,3 +98,17 @@ void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
 				__builtin_return_address(0));
 }
 EXPORT_SYMBOL(ioremap_cache);
+
+#ifdef CONFIG_PCI
+int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr)
+{
+	BUG_ON(offset + SZ_64K > IO_SPACE_LIMIT);
+
+	return ioremap_page_range((unsigned long)PCI_IOBASE + offset,
+				  (unsigned long)PCI_IOBASE + offset + SZ_64K,
+				  phys_addr,
+				  __pgprot(PROT_NORMAL_NC));
+}
+EXPORT_SYMBOL_GPL(pci_ioremap_io);
+#endif
+
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 6ebf5bf..0f3f821 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_MICROBLAZE) += setup-bus.o
 obj-$(CONFIG_TILE) += setup-bus.o setup-irq.o
 obj-$(CONFIG_SPARC_LEON) += setup-bus.o setup-irq.o
 obj-$(CONFIG_M68K) += setup-bus.o setup-irq.o
+obj-$(CONFIG_ARM64) += setup-bus.o setup-irq.o
 
 #
 # ACPI Related PCI FW Functions
