diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 92f173b..4ba09b2 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -49,6 +49,7 @@
 #include <asm/setup.h>
 #include <xsm/xsm.h>
 #include <asm/acpi.h>
+#include <acpi/acpi_iort.h>
 
 struct bootinfo __initdata bootinfo;
 
@@ -796,6 +797,8 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     tasklet_subsys_init();
 
+    /* Parse the ACPI iort data */
+    acpi_iort_init();
 
     xsm_dt_init();
 
diff --git a/xen/drivers/acpi/Makefile b/xen/drivers/acpi/Makefile
index 444b11d..e7ffd82 100644
--- a/xen/drivers/acpi/Makefile
+++ b/xen/drivers/acpi/Makefile
@@ -1,5 +1,6 @@
 subdir-y += tables
 subdir-y += utilities
+subdir-$(CONFIG_ARM) += arm
 subdir-$(CONFIG_X86) += apei
 
 obj-bin-y += tables.init.o
diff --git a/xen/drivers/acpi/arm/Makefile b/xen/drivers/acpi/arm/Makefile
new file mode 100644
index 0000000..7c039bb
--- /dev/null
+++ b/xen/drivers/acpi/arm/Makefile
@@ -0,0 +1 @@
+obj-y += iort.o
diff --git a/xen/drivers/acpi/arm/iort.c b/xen/drivers/acpi/arm/iort.c
index 2e368a6..7f54062 100644
--- a/xen/drivers/acpi/arm/iort.c
+++ b/xen/drivers/acpi/arm/iort.c
@@ -14,17 +14,47 @@
  * This file implements early detection/parsing of I/O mapping
  * reported to OS through firmware via I/O Remapping Table (IORT)
  * IORT document number: ARM DEN 0049A
+ *
+ * Based on Linux drivers/acpi/arm64/iort.c
+ * => commit ca78d3173cff3503bcd15723b049757f75762d15
+ *
+ * Xen modification:
+ * Sameer Goel <sgoel@codeaurora.org>
+ * Copyright (C) 2017, The Linux Foundation, All rights reserved.
+ *
  */
 
-#define pr_fmt(fmt)	"ACPI: IORT: " fmt
-
-#include <linux/acpi_iort.h>
-#include <linux/iommu.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
+#include <xen/acpi.h>
+#include <acpi/acpi_iort.h>
+#include <xen/fwnode.h>
+#include <xen/iommu.h>
+#include <xen/lib.h>
+#include <xen/list.h>
+#include <xen/pci.h>
+
+#include <asm/device.h>
+
+/* Xen: Define compatibility functions */
+#define FW_BUG		"[Firmware Bug]: "
+#define pr_err(fmt, ...) printk(XENLOG_ERR fmt, ## __VA_ARGS__)
+#define pr_warn(fmt, ...) printk(XENLOG_WARNING fmt, ## __VA_ARGS__)
+
+/* Alias to Xen allocation helpers */
+#define kfree xfree
+#define kmalloc(size, flags)            _xmalloc(size, sizeof(void *))
+#define kzalloc(size, flags)            _xzalloc(size, sizeof(void *))
+
+/* Redefine WARN macros */
+#undef WARN
+#undef WARN_ON
+#define WARN(condition, format...) ({					\
+	int __ret_warn_on = !!(condition);				\
+	if (unlikely(__ret_warn_on))					\
+		printk(format);						\
+	unlikely(__ret_warn_on);					\
+})
+#define WARN_TAINT(cond, taint, format...) WARN(cond, format)
+#define WARN_ON(cond)                      (!!cond)
 
 #define IORT_TYPE_MASK(type)	(1 << (type))
 #define IORT_MSI_TYPE		(1 << ACPI_IORT_NODE_ITS_GROUP)
@@ -256,6 +286,13 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
 	acpi_status status;
 
 	if (node->type == ACPI_IORT_NODE_NAMED_COMPONENT) {
+		status = AE_NOT_IMPLEMENTED;
+/*
+ * We need the namespace object name from dsdt to match the iort node, this
+ * will need additions to the kernel xen bus notifiers.
+ * So, disabling the named node code till a proposal is approved.
+ */
+#if 0
 		struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
 		struct acpi_device *adev = to_acpi_device_node(dev->fwnode);
 		struct acpi_iort_named_component *ncomp;
@@ -275,11 +312,12 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
 		status = !strcmp(ncomp->device_name, buf.pointer) ?
 							AE_OK : AE_NOT_FOUND;
 		acpi_os_free(buf.pointer);
+#endif
 	} else if (node->type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
 		struct acpi_iort_root_complex *pci_rc;
-		struct pci_bus *bus;
+		struct pci_dev *pci_dev;
 
-		bus = to_pci_bus(dev);
+		pci_dev = to_pci_dev(dev);
 		pci_rc = (struct acpi_iort_root_complex *)node->node_data;
 
 		/*
@@ -287,12 +325,11 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
 		 * with root complexes. Each segment number can represent only
 		 * one root complex.
 		 */
-		status = pci_rc->pci_segment_number == pci_domain_nr(bus) ?
+		status = pci_rc->pci_segment_number == pci_domain_nr(pci_dev) ?
 							AE_OK : AE_NOT_FOUND;
 	} else {
 		status = AE_NOT_FOUND;
 	}
-out:
 	return status;
 }
 
@@ -320,6 +357,11 @@ static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
 	return 0;
 }
 
+/*
+ * Named components are not supported yet so we do not need the
+ * iort_node_get_id function
+ */
+#if 0
 static
 struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 					u32 *id_out, u8 type_mask,
@@ -358,6 +400,7 @@ struct acpi_iort_node *iort_node_get_id(struct acpi_iort_node *node,
 
 	return NULL;
 }
+#endif
 
 static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
 						u32 rid_in, u32 *rid_out,
@@ -410,6 +453,10 @@ fail_map:
 	return NULL;
 }
 
+/* Xen: Comment out the NamedComponent and ITS mapping code till the support
+ * is available.
+ */
+#if 0
 static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
 {
 	struct pci_bus *pbus;
@@ -481,7 +528,7 @@ static int iort_dev_find_its_id(struct device *dev, u32 req_id,
 	return 0;
 }
 
-/**
+/*
  * iort_get_device_domain() - Find MSI domain related to a device
  * @dev: The device.
  * @req_id: Requester ID for the device.
@@ -510,7 +557,7 @@ static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
 	*rid = alias;
 	return 0;
 }
-
+#endif
 static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
 			       struct fwnode_handle *fwnode,
 			       const struct iommu_ops *ops)
@@ -546,6 +593,7 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev,
 	return ret ? NULL : ops;
 }
 
+#if 0 /* Xen: We do not need this function for Xen */
 /**
  * iort_set_dma_mask - Set-up dma mask for a device.
  *
@@ -567,7 +615,7 @@ void iort_set_dma_mask(struct device *dev)
 	if (!dev->dma_mask)
 		dev->dma_mask = &dev->coherent_dma_mask;
 }
-
+#endif
 /**
  * iort_iommu_configure - Set-up IOMMU configuration for a device.
  *
@@ -583,14 +631,13 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
 	u32 streamid = 0;
 
 	if (dev_is_pci(dev)) {
-		struct pci_bus *bus = to_pci_dev(dev)->bus;
+		struct pci_dev *pci_device = to_pci_dev(dev);
 		u32 rid;
 
-		pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid,
-				       &rid);
+		rid = PCI_BDF2(pci_device->bus, pci_device->devfn);
 
 		node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
-				      iort_match_node_callback, &bus->dev);
+				      iort_match_node_callback, dev);
 		if (!node)
 			return NULL;
 
@@ -600,6 +647,13 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
 		ops = iort_iommu_xlate(dev, parent, streamid);
 
 	} else {
+		return NULL;
+/*
+ * We need the namespace object name from dsdt to match the iort node, this
+ * will need additions to the kernel xen bus notifiers.
+ * So, disabling the named node code till a proposal is approved.
+ */
+#if 0
 		int i = 0;
 
 		node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
@@ -616,11 +670,17 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
 			parent = iort_node_get_id(node, &streamid,
 						  IORT_IOMMU_TYPE, i++);
 		}
+#endif
 	}
 
 	return ops;
 }
 
+/*
+ * Xen: Not using the parsing ops for now. Need to check and see if it will
+ * be useful to use these in some form, or let the driver parse IORT node.
+ */
+#if 0
 static void __init acpi_iort_register_irq(int hwirq, const char *name,
 					  int trigger,
 					  struct resource *res)
@@ -807,7 +867,7 @@ const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
 		return NULL;
 	}
 }
-
+#endif
 /**
  * iort_add_smmu_platform_device() - Allocate a platform device for SMMU
  * @node: Pointer to SMMU ACPI IORT node
@@ -817,78 +877,42 @@ const struct iort_iommu_config *iort_get_iommu_cfg(struct acpi_iort_node *node)
 static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
 {
 	struct fwnode_handle *fwnode;
-	struct platform_device *pdev;
-	struct resource *r;
-	enum dev_dma_attr attr;
-	int ret, count;
-	const struct iort_iommu_config *ops = iort_get_iommu_cfg(node);
-
-	if (!ops)
-		return -ENODEV;
-
-	pdev = platform_device_alloc(ops->name, PLATFORM_DEVID_AUTO);
-	if (!pdev)
-		return -ENOMEM;
-
-	count = ops->iommu_count_resources(node);
-
-	r = kcalloc(count, sizeof(*r), GFP_KERNEL);
-	if (!r) {
-		ret = -ENOMEM;
-		goto dev_put;
-	}
-
-	ops->iommu_init_resources(r, node);
+	struct device *dev;
+	int ret;
 
-	ret = platform_device_add_resources(pdev, r, count);
 	/*
-	 * Resources are duplicated in platform_device_add_resources,
-	 * free their allocated memory
+	 * Not enabling the parsing ops for now. The corresponding driver
+	 * can parse this information as needed, so deleting relevant code as
+	 * compared to base revision.
 	 */
-	kfree(r);
 
-	if (ret)
-		goto dev_put;
+	dev = kzalloc(sizeof(struct device), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
 
 	/*
 	 * Add a copy of IORT node pointer to platform_data to
 	 * be used to retrieve IORT data information.
 	 */
-	ret = platform_device_add_data(pdev, &node, sizeof(node));
-	if (ret)
-		goto dev_put;
-
-	/*
-	 * We expect the dma masks to be equivalent for
-	 * all SMMUs set-ups
-	 */
-	pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+	dev->type = DEV_ACPI;
+	dev->acpi_node = node;
 
 	fwnode = iort_get_fwnode(node);
 
 	if (!fwnode) {
 		ret = -ENODEV;
-		goto dev_put;
+		goto error;
 	}
 
-	pdev->dev.fwnode = fwnode;
-
-	attr = ops->iommu_is_coherent(node) ?
-			     DEV_DMA_COHERENT : DEV_DMA_NON_COHERENT;
-
-	/* Configure DMA for the page table walker */
-	acpi_dma_configure(&pdev->dev, attr);
+	dev->fwnode = fwnode;
 
-	ret = platform_device_add(pdev);
-	if (ret)
-		goto dma_deconfigure;
+	/* Call the acpi init functions for IOMMU devices */
+	ret = acpi_device_init(DEVICE_IOMMU, (void *)dev, node->type);
 
 	return 0;
 
-dma_deconfigure:
-	acpi_dma_deconfigure(&pdev->dev);
-dev_put:
-	platform_device_put(pdev);
+error:
+	kfree(dev);
 
 	return ret;
 }
@@ -957,5 +981,6 @@ void __init acpi_iort_init(void)
 
 	iort_init_platform_devices();
 
-	acpi_probe_device_table(iort);
+	/* Xen; Do not need a device table probe */
+	/* acpi_probe_device_table(iort);*/
 }
diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/arm/smmu.c
index 362d578..ad956d5 100644
--- a/xen/drivers/passthrough/arm/smmu.c
+++ b/xen/drivers/passthrough/arm/smmu.c
@@ -181,6 +181,7 @@ static void __iomem *devm_ioremap_resource(struct device *dev,
  * Xen: PCI functions
  * TODO: It should be implemented when PCI will be supported
  */
+#undef to_pci_dev
 #define to_pci_dev(dev)	(NULL)
 static inline int pci_for_each_dma_alias(struct pci_dev *pdev,
 					 int (*fn) (struct pci_dev *pdev,
diff --git a/xen/include/acpi/acpi_iort.h b/xen/include/acpi/acpi_iort.h
index 77e0809..d4315a4 100644
--- a/xen/include/acpi/acpi_iort.h
+++ b/xen/include/acpi/acpi_iort.h
@@ -19,27 +19,32 @@
 #ifndef __ACPI_IORT_H__
 #define __ACPI_IORT_H__
 
-#include <linux/acpi.h>
-#include <linux/fwnode.h>
-#include <linux/irqdomain.h>
+#include <xen/acpi.h>
+#include <asm/device.h>
 
+/* Xen: Not using IORT IRQ bindings */
+#if 0
 #define IORT_IRQ_MASK(irq)		(irq & 0xffffffffULL)
 #define IORT_IRQ_TRIGGER_MASK(irq)	((irq >> 32) & 0xffffffffULL)
 
 int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node);
 void iort_deregister_domain_token(int trans_id);
 struct fwnode_handle *iort_find_domain_token(int trans_id);
-#ifdef CONFIG_ACPI_IORT
+#endif
+#ifdef CONFIG_ARM_64
 void acpi_iort_init(void);
 bool iort_node_match(u8 type);
+#if 0
 u32 iort_msi_map_rid(struct device *dev, u32 req_id);
 struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
 /* IOMMU interface */
 void iort_set_dma_mask(struct device *dev);
+#endif
 const struct iommu_ops *iort_iommu_configure(struct device *dev);
 #else
 static inline void acpi_iort_init(void) { }
 static inline bool iort_node_match(u8 type) { return false; }
+#if 0
 static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
 { return req_id; }
 static inline struct irq_domain *iort_get_device_domain(struct device *dev,
@@ -47,12 +52,10 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev,
 { return NULL; }
 /* IOMMU interface */
 static inline void iort_set_dma_mask(struct device *dev) { }
+#endif
 static inline
 const struct iommu_ops *iort_iommu_configure(struct device *dev)
 { return NULL; }
 #endif
 
-#define IORT_ACPI_DECLARE(name, table_id, fn)		\
-	ACPI_DECLARE_PROBE_ENTRY(iort, name, table_id, 0, NULL, 0, fn)
-
 #endif /* __ACPI_IORT_H__ */
diff --git a/xen/include/asm-arm/device.h b/xen/include/asm-arm/device.h
index 5027c87..4eef9ce 100644
--- a/xen/include/asm-arm/device.h
+++ b/xen/include/asm-arm/device.h
@@ -7,6 +7,7 @@
 enum device_type
 {
     DEV_DT,
+    DEV_ACPI,
 };
 
 struct dev_archdata {
@@ -20,6 +21,7 @@ struct device
 #ifdef CONFIG_HAS_DEVICE_TREE
     struct dt_device_node *of_node; /* Used by drivers imported from Linux */
 #endif
+    void *acpi_node; /*Current use case is acpi_iort_node */
     struct fwnode_handle *fwnode; /*fw device node identifier */
     struct iommu_fwspec *iommu_fwspec;
     struct dev_archdata archdata;
diff --git a/xen/include/xen/acpi.h b/xen/include/xen/acpi.h
index 9409350..2f6aae1 100644
--- a/xen/include/xen/acpi.h
+++ b/xen/include/xen/acpi.h
@@ -32,6 +32,7 @@
 
 #include <acpi/acpi.h>
 #include <asm/acpi.h>
+#include <xen/fwnode.h>
 
 #define ACPI_MADT_GET_(fld, x) (((x) & ACPI_MADT_##fld##_MASK) / \
 	(ACPI_MADT_##fld##_MASK & -ACPI_MADT_##fld##_MASK))
@@ -49,6 +50,26 @@
                 (!(entry)) || (unsigned long)(entry) + sizeof(*(entry)) > (end) ||  \
                 (entry)->header.length < sizeof(*(entry)))
 
+static inline struct fwnode_handle *acpi_alloc_fwnode_static(void)
+{
+	struct fwnode_handle *fwnode;
+
+	fwnode = xzalloc(struct fwnode_handle);
+	if (!fwnode)
+		return NULL;
+
+	fwnode->type = FWNODE_ACPI_STATIC;
+
+	return fwnode;
+}
+
+static inline void acpi_free_fwnode_static(struct fwnode_handle *fwnode)
+{
+	if (!fwnode || fwnode->type != FWNODE_ACPI_STATIC)
+		return;
+
+	xfree(fwnode);
+}
 #ifdef CONFIG_ACPI
 
 enum acpi_interrupt_id {
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 43f2125..182b1a5 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -92,8 +92,16 @@ struct pci_dev {
 #define PT_FAULT_THRESHOLD 10
     } fault;
     u64 vf_rlen[6];
+#ifdef CONFIG_ARM
+    struct device dev;
+#endif
 };
 
+#ifdef CONFIG_ARM
+#define to_pci_dev(p) container_of(p, struct pci_dev,dev)
+#define pci_domain_nr(dev) dev->seg
+#endif
+
 #define for_each_pdev(domain, pdev) \
     list_for_each_entry(pdev, &(domain->arch.pdev_list), domain_list)
 
