Fixed MTP to work with TWRP

arch/ia64/pci/Makefile

@@ -0,0 +1,4 @@
+#
+# Makefile for the ia64-specific parts of the pci bus
+#
+obj-y		:= pci.o fixup.o

arch/ia64/pci/fixup.c

@@ -0,0 +1,70 @@
+/*
+ * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
+ * Derived from fixup.c of i386 tree.
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/vgaarb.h>
+#include <linux/screen_info.h>
+
+#include <asm/machvec.h>
+
+/*
+ * Fixup to mark boot BIOS video selected by BIOS before it changes
+ *
+ * From information provided by "Jon Smirl" <jonsmirl@gmail.com>
+ *
+ * The standard boot ROM sequence for an x86 machine uses the BIOS
+ * to select an initial video card for boot display. This boot video
+ * card will have it's BIOS copied to C0000 in system RAM.
+ * IORESOURCE_ROM_SHADOW is used to associate the boot video
+ * card with this copy. On laptops this copy has to be used since
+ * the main ROM may be compressed or combined with another image.
+ * See pci_map_rom() for use of this flag. Before marking the device
+ * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set
+ * by either arch cde or vga-arbitration, if so only apply the fixup to this
+ * already determined primary video card.
+ */
+
+static void pci_fixup_video(struct pci_dev *pdev)
+{
+	struct pci_dev *bridge;
+	struct pci_bus *bus;
+	u16 config;
+
+	if ((strcmp(ia64_platform_name, "dig") != 0)
+	    && (strcmp(ia64_platform_name, "hpzx1")  != 0))
+		return;
+	/* Maybe, this machine supports legacy memory map. */
+
+	/* Is VGA routed to us? */
+	bus = pdev->bus;
+	while (bus) {
+		bridge = bus->self;
+
+		/*
+		 * From information provided by
+		 * "David Miller" <davem@davemloft.net>
+		 * The bridge control register is valid for PCI header
+		 * type BRIDGE, or CARDBUS. Host to PCI controllers use
+		 * PCI header type NORMAL.
+		 */
+		if (bridge && (pci_is_bridge(bridge))) {
+			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
+						&config);
+			if (!(config & PCI_BRIDGE_CTL_VGA))
+				return;
+		}
+		bus = bus->parent;
+	}
+	if (!vga_default_device() || pdev == vga_default_device()) {
+		pci_read_config_word(pdev, PCI_COMMAND, &config);
+		if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
+			pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
+			dev_printk(KERN_DEBUG, &pdev->dev, "Video device with shadowed ROM\n");
+		}
+	}
+}
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
+				PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);

arch/ia64/pci/pci.c

@@ -0,0 +1,826 @@
+/*
+ * pci.c - Low-Level PCI Access in IA-64
+ *
+ * Derived from bios32.c of i386 tree.
+ *
+ * (c) Copyright 2002, 2005 Hewlett-Packard Development Company, L.P.
+ *	David Mosberger-Tang <davidm@hpl.hp.com>
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ * Copyright (C) 2004 Silicon Graphics, Inc.
+ *
+ * Note: Above list of copyright holders is incomplete...
+ */
+
+#include <linux/acpi.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/pci-acpi.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/bootmem.h>
+#include <linux/export.h>
+
+#include <asm/machvec.h>
+#include <asm/page.h>
+#include <asm/io.h>
+#include <asm/sal.h>
+#include <asm/smp.h>
+#include <asm/irq.h>
+#include <asm/hw_irq.h>
+
+/*
+ * Low-level SAL-based PCI configuration access functions. Note that SAL
+ * calls are already serialized (via sal_lock), so we don't need another
+ * synchronization mechanism here.
+ */
+
+#define PCI_SAL_ADDRESS(seg, bus, devfn, reg)		\
+	(((u64) seg << 24) | (bus << 16) | (devfn << 8) | (reg))
+
+/* SAL 3.2 adds support for extended config space. */
+
+#define PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg)	\
+	(((u64) seg << 28) | (bus << 20) | (devfn << 12) | (reg))
+
+int raw_pci_read(unsigned int seg, unsigned int bus, unsigned int devfn,
+	      int reg, int len, u32 *value)
+{
+	u64 addr, data = 0;
+	int mode, result;
+
+	if (!value || (seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
+		return -EINVAL;
+
+	if ((seg | reg) <= 255) {
+		addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
+		mode = 0;
+	} else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
+		addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
+		mode = 1;
+	} else {
+		return -EINVAL;
+	}
+
+	result = ia64_sal_pci_config_read(addr, mode, len, &data);
+	if (result != 0)
+		return -EINVAL;
+
+	*value = (u32) data;
+	return 0;
+}
+
+int raw_pci_write(unsigned int seg, unsigned int bus, unsigned int devfn,
+	       int reg, int len, u32 value)
+{
+	u64 addr;
+	int mode, result;
+
+	if ((seg > 65535) || (bus > 255) || (devfn > 255) || (reg > 4095))
+		return -EINVAL;
+
+	if ((seg | reg) <= 255) {
+		addr = PCI_SAL_ADDRESS(seg, bus, devfn, reg);
+		mode = 0;
+	} else if (sal_revision >= SAL_VERSION_CODE(3,2)) {
+		addr = PCI_SAL_EXT_ADDRESS(seg, bus, devfn, reg);
+		mode = 1;
+	} else {
+		return -EINVAL;
+	}
+	result = ia64_sal_pci_config_write(addr, mode, len, value);
+	if (result != 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
+							int size, u32 *value)
+{
+	return raw_pci_read(pci_domain_nr(bus), bus->number,
+				 devfn, where, size, value);
+}
+
+static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
+							int size, u32 value)
+{
+	return raw_pci_write(pci_domain_nr(bus), bus->number,
+				  devfn, where, size, value);
+}
+
+struct pci_ops pci_root_ops = {
+	.read = pci_read,
+	.write = pci_write,
+};
+
+/* Called by ACPI when it finds a new root bus.  */
+
+static struct pci_controller *alloc_pci_controller(int seg)
+{
+	struct pci_controller *controller;
+
+	controller = kzalloc(sizeof(*controller), GFP_KERNEL);
+	if (!controller)
+		return NULL;
+
+	controller->segment = seg;
+	return controller;
+}
+
+struct pci_root_info {
+	struct acpi_device *bridge;
+	struct pci_controller *controller;
+	struct list_head resources;
+	struct resource *res;
+	resource_size_t *res_offset;
+	unsigned int res_num;
+	struct list_head io_resources;
+	char *name;
+};
+
+static unsigned int
+new_space (u64 phys_base, int sparse)
+{
+	u64 mmio_base;
+	int i;
+
+	if (phys_base == 0)
+		return 0;	/* legacy I/O port space */
+
+	mmio_base = (u64) ioremap(phys_base, 0);
+	for (i = 0; i < num_io_spaces; i++)
+		if (io_space[i].mmio_base == mmio_base &&
+		    io_space[i].sparse == sparse)
+			return i;
+
+	if (num_io_spaces == MAX_IO_SPACES) {
+		pr_err("PCI: Too many IO port spaces "
+			"(MAX_IO_SPACES=%lu)\n", MAX_IO_SPACES);
+		return ~0;
+	}
+
+	i = num_io_spaces++;
+	io_space[i].mmio_base = mmio_base;
+	io_space[i].sparse = sparse;
+
+	return i;
+}
+
+static u64 add_io_space(struct pci_root_info *info,
+			struct acpi_resource_address64 *addr)
+{
+	struct iospace_resource *iospace;
+	struct resource *resource;
+	char *name;
+	unsigned long base, min, max, base_port;
+	unsigned int sparse = 0, space_nr, len;
+
+	len = strlen(info->name) + 32;
+	iospace = kzalloc(sizeof(*iospace) + len, GFP_KERNEL);
+	if (!iospace) {
+		dev_err(&info->bridge->dev,
+				"PCI: No memory for %s I/O port space\n",
+				info->name);
+		goto out;
+	}
+
+	name = (char *)(iospace + 1);
+
+	min = addr->minimum;
+	max = min + addr->address_length - 1;
+	if (addr->info.io.translation_type == ACPI_SPARSE_TRANSLATION)
+		sparse = 1;
+
+	space_nr = new_space(addr->translation_offset, sparse);
+	if (space_nr == ~0)
+		goto free_resource;
+
+	base = __pa(io_space[space_nr].mmio_base);
+	base_port = IO_SPACE_BASE(space_nr);
+	snprintf(name, len, "%s I/O Ports %08lx-%08lx", info->name,
+		base_port + min, base_port + max);
+
+	/*
+	 * The SDM guarantees the legacy 0-64K space is sparse, but if the
+	 * mapping is done by the processor (not the bridge), ACPI may not
+	 * mark it as sparse.
+	 */
+	if (space_nr == 0)
+		sparse = 1;
+
+	resource = &iospace->res;
+	resource->name  = name;
+	resource->flags = IORESOURCE_MEM;
+	resource->start = base + (sparse ? IO_SPACE_SPARSE_ENCODING(min) : min);
+	resource->end   = base + (sparse ? IO_SPACE_SPARSE_ENCODING(max) : max);
+	if (insert_resource(&iomem_resource, resource)) {
+		dev_err(&info->bridge->dev,
+				"can't allocate host bridge io space resource  %pR\n",
+				resource);
+		goto free_resource;
+	}
+
+	list_add_tail(&iospace->list, &info->io_resources);
+	return base_port;
+
+free_resource:
+	kfree(iospace);
+out:
+	return ~0;
+}
+
+static acpi_status resource_to_window(struct acpi_resource *resource,
+				      struct acpi_resource_address64 *addr)
+{
+	acpi_status status;
+
+	/*
+	 * We're only interested in _CRS descriptors that are
+	 *	- address space descriptors for memory or I/O space
+	 *	- non-zero size
+	 *	- producers, i.e., the address space is routed downstream,
+	 *	  not consumed by the bridge itself
+	 */
+	status = acpi_resource_to_address64(resource, addr);
+	if (ACPI_SUCCESS(status) &&
+	    (addr->resource_type == ACPI_MEMORY_RANGE ||
+	     addr->resource_type == ACPI_IO_RANGE) &&
+	    addr->address_length &&
+	    addr->producer_consumer == ACPI_PRODUCER)
+		return AE_OK;
+
+	return AE_ERROR;
+}
+
+static acpi_status count_window(struct acpi_resource *resource, void *data)
+{
+	unsigned int *windows = (unsigned int *) data;
+	struct acpi_resource_address64 addr;
+	acpi_status status;
+
+	status = resource_to_window(resource, &addr);
+	if (ACPI_SUCCESS(status))
+		(*windows)++;
+
+	return AE_OK;
+}
+
+static acpi_status add_window(struct acpi_resource *res, void *data)
+{
+	struct pci_root_info *info = data;
+	struct resource *resource;
+	struct acpi_resource_address64 addr;
+	acpi_status status;
+	unsigned long flags, offset = 0;
+	struct resource *root;
+
+	/* Return AE_OK for non-window resources to keep scanning for more */
+	status = resource_to_window(res, &addr);
+	if (!ACPI_SUCCESS(status))
+		return AE_OK;
+
+	if (addr.resource_type == ACPI_MEMORY_RANGE) {
+		flags = IORESOURCE_MEM;
+		root = &iomem_resource;
+		offset = addr.translation_offset;
+	} else if (addr.resource_type == ACPI_IO_RANGE) {
+		flags = IORESOURCE_IO;
+		root = &ioport_resource;
+		offset = add_io_space(info, &addr);
+		if (offset == ~0)
+			return AE_OK;
+	} else
+		return AE_OK;
+
+	resource = &info->res[info->res_num];
+	resource->name = info->name;
+	resource->flags = flags;
+	resource->start = addr.minimum + offset;
+	resource->end = resource->start + addr.address_length - 1;
+	info->res_offset[info->res_num] = offset;
+
+	if (insert_resource(root, resource)) {
+		dev_err(&info->bridge->dev,
+			"can't allocate host bridge window %pR\n",
+			resource);
+	} else {
+		if (offset)
+			dev_info(&info->bridge->dev, "host bridge window %pR "
+				 "(PCI address [%#llx-%#llx])\n",
+				 resource,
+				 resource->start - offset,
+				 resource->end - offset);
+		else
+			dev_info(&info->bridge->dev,
+				 "host bridge window %pR\n", resource);
+	}
+	/* HP's firmware has a hack to work around a Windows bug.
+	 * Ignore these tiny memory ranges */
+	if (!((resource->flags & IORESOURCE_MEM) &&
+	      (resource->end - resource->start < 16)))
+		pci_add_resource_offset(&info->resources, resource,
+					info->res_offset[info->res_num]);
+
+	info->res_num++;
+	return AE_OK;
+}
+
+static void free_pci_root_info_res(struct pci_root_info *info)
+{
+	struct iospace_resource *iospace, *tmp;
+
+	list_for_each_entry_safe(iospace, tmp, &info->io_resources, list)
+		kfree(iospace);
+
+	kfree(info->name);
+	kfree(info->res);
+	info->res = NULL;
+	kfree(info->res_offset);
+	info->res_offset = NULL;
+	info->res_num = 0;
+	kfree(info->controller);
+	info->controller = NULL;
+}
+
+static void __release_pci_root_info(struct pci_root_info *info)
+{
+	int i;
+	struct resource *res;
+	struct iospace_resource *iospace;
+
+	list_for_each_entry(iospace, &info->io_resources, list)
+		release_resource(&iospace->res);
+
+	for (i = 0; i < info->res_num; i++) {
+		res = &info->res[i];
+
+		if (!res->parent)
+			continue;
+
+		if (!(res->flags & (IORESOURCE_MEM | IORESOURCE_IO)))
+			continue;
+
+		release_resource(res);
+	}
+
+	free_pci_root_info_res(info);
+	kfree(info);
+}
+
+static void release_pci_root_info(struct pci_host_bridge *bridge)
+{
+	struct pci_root_info *info = bridge->release_data;
+
+	__release_pci_root_info(info);
+}
+
+static int
+probe_pci_root_info(struct pci_root_info *info, struct acpi_device *device,
+		int busnum, int domain)
+{
+	char *name;
+
+	name = kmalloc(16, GFP_KERNEL);
+	if (!name)
+		return -ENOMEM;
+
+	sprintf(name, "PCI Bus %04x:%02x", domain, busnum);
+	info->bridge = device;
+	info->name = name;
+
+	acpi_walk_resources(device->handle, METHOD_NAME__CRS, count_window,
+			&info->res_num);
+	if (info->res_num) {
+		info->res =
+			kzalloc_node(sizeof(*info->res) * info->res_num,
+				     GFP_KERNEL, info->controller->node);
+		if (!info->res) {
+			kfree(name);
+			return -ENOMEM;
+		}
+
+		info->res_offset =
+			kzalloc_node(sizeof(*info->res_offset) * info->res_num,
+					GFP_KERNEL, info->controller->node);
+		if (!info->res_offset) {
+			kfree(name);
+			kfree(info->res);
+			info->res = NULL;
+			return -ENOMEM;
+		}
+
+		info->res_num = 0;
+		acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+			add_window, info);
+	} else
+		kfree(name);
+
+	return 0;
+}
+
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+	struct acpi_device *device = root->device;
+	int domain = root->segment;
+	int bus = root->secondary.start;
+	struct pci_controller *controller;
+	struct pci_root_info *info = NULL;
+	int busnum = root->secondary.start;
+	struct pci_bus *pbus;
+	int ret;
+
+	controller = alloc_pci_controller(domain);
+	if (!controller)
+		return NULL;
+
+	controller->companion = device;
+	controller->node = acpi_get_node(device->handle);
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+	if (!info) {
+		dev_err(&device->dev,
+				"pci_bus %04x:%02x: ignored (out of memory)\n",
+				domain, busnum);
+		kfree(controller);
+		return NULL;
+	}
+
+	info->controller = controller;
+	INIT_LIST_HEAD(&info->io_resources);
+	INIT_LIST_HEAD(&info->resources);
+
+	ret = probe_pci_root_info(info, device, busnum, domain);
+	if (ret) {
+		kfree(info->controller);
+		kfree(info);
+		return NULL;
+	}
+	/* insert busn resource at first */
+	pci_add_resource(&info->resources, &root->secondary);
+	/*
+	 * See arch/x86/pci/acpi.c.
+	 * The desired pci bus might already be scanned in a quirk. We
+	 * should handle the case here, but it appears that IA64 hasn't
+	 * such quirk. So we just ignore the case now.
+	 */
+	pbus = pci_create_root_bus(NULL, bus, &pci_root_ops, controller,
+				   &info->resources);
+	if (!pbus) {
+		pci_free_resource_list(&info->resources);
+		__release_pci_root_info(info);
+		return NULL;
+	}
+
+	pci_set_host_bridge_release(to_pci_host_bridge(pbus->bridge),
+			release_pci_root_info, info);
+	pci_scan_child_bus(pbus);
+	return pbus;
+}
+
+int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+	struct pci_controller *controller = bridge->bus->sysdata;
+
+	ACPI_COMPANION_SET(&bridge->dev, controller->companion);
+	return 0;
+}
+
+static int is_valid_resource(struct pci_dev *dev, int idx)
+{
+	unsigned int i, type_mask = IORESOURCE_IO | IORESOURCE_MEM;
+	struct resource *devr = &dev->resource[idx], *busr;
+
+	if (!dev->bus)
+		return 0;
+
+	pci_bus_for_each_resource(dev->bus, busr, i) {
+		if (!busr || ((busr->flags ^ devr->flags) & type_mask))
+			continue;
+		if ((devr->start) && (devr->start >= busr->start) &&
+				(devr->end <= busr->end))
+			return 1;
+	}
+	return 0;
+}
+
+static void pcibios_fixup_resources(struct pci_dev *dev, int start, int limit)
+{
+	int i;
+
+	for (i = start; i < limit; i++) {
+		if (!dev->resource[i].flags)
+			continue;
+		if ((is_valid_resource(dev, i)))
+			pci_claim_resource(dev, i);
+	}
+}
+
+void pcibios_fixup_device_resources(struct pci_dev *dev)
+{
+	pcibios_fixup_resources(dev, 0, PCI_BRIDGE_RESOURCES);
+}
+EXPORT_SYMBOL_GPL(pcibios_fixup_device_resources);
+
+static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
+{
+	pcibios_fixup_resources(dev, PCI_BRIDGE_RESOURCES, PCI_NUM_RESOURCES);
+}
+
+/*
+ *  Called after each bus is probed, but before its children are examined.
+ */
+void pcibios_fixup_bus(struct pci_bus *b)
+{
+	struct pci_dev *dev;
+
+	if (b->self) {
+		pci_read_bridge_bases(b);
+		pcibios_fixup_bridge_resources(b->self);
+	}
+	list_for_each_entry(dev, &b->devices, bus_list)
+		pcibios_fixup_device_resources(dev);
+	platform_pci_fixup_bus(b);
+}
+
+void pcibios_add_bus(struct pci_bus *bus)
+{
+	acpi_pci_add_bus(bus);
+}
+
+void pcibios_remove_bus(struct pci_bus *bus)
+{
+	acpi_pci_remove_bus(bus);
+}
+
+void pcibios_set_master (struct pci_dev *dev)
+{
+	/* No special bus mastering setup handling */
+}
+
+int
+pcibios_enable_device (struct pci_dev *dev, int mask)
+{
+	int ret;
+
+	ret = pci_enable_resources(dev, mask);
+	if (ret < 0)
+		return ret;
+
+	if (!dev->msi_enabled)
+		return acpi_pci_irq_enable(dev);
+	return 0;
+}
+
+void
+pcibios_disable_device (struct pci_dev *dev)
+{
+	BUG_ON(atomic_read(&dev->enable_cnt));
+	if (!dev->msi_enabled)
+		acpi_pci_irq_disable(dev);
+}
+
+resource_size_t
+pcibios_align_resource (void *data, const struct resource *res,
+		        resource_size_t size, resource_size_t align)
+{
+	return res->start;
+}
+
+int
+pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
+		     enum pci_mmap_state mmap_state, int write_combine)
+{
+	unsigned long size = vma->vm_end - vma->vm_start;
+	pgprot_t prot;
+
+	/*
+	 * I/O space cannot be accessed via normal processor loads and
+	 * stores on this platform.
+	 */
+	if (mmap_state == pci_mmap_io)
+		/*
+		 * XXX we could relax this for I/O spaces for which ACPI
+		 * indicates that the space is 1-to-1 mapped.  But at the
+		 * moment, we don't support multiple PCI address spaces and
+		 * the legacy I/O space is not 1-to-1 mapped, so this is moot.
+		 */
+		return -EINVAL;
+
+	if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
+		return -EINVAL;
+
+	prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
+				    vma->vm_page_prot);
+
+	/*
+	 * If the user requested WC, the kernel uses UC or WC for this region,
+	 * and the chipset supports WC, we can use WC. Otherwise, we have to
+	 * use the same attribute the kernel uses.
+	 */
+	if (write_combine &&
+	    ((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC ||
+	     (pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) &&
+	    efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
+		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
+	else
+		vma->vm_page_prot = prot;
+
+	if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+			     vma->vm_end - vma->vm_start, vma->vm_page_prot))
+		return -EAGAIN;
+
+	return 0;
+}
+
+/**
+ * ia64_pci_get_legacy_mem - generic legacy mem routine
+ * @bus: bus to get legacy memory base address for
+ *
+ * Find the base of legacy memory for @bus.  This is typically the first
+ * megabyte of bus address space for @bus or is simply 0 on platforms whose
+ * chipsets support legacy I/O and memory routing.  Returns the base address
+ * or an error pointer if an error occurred.
+ *
+ * This is the ia64 generic version of this routine.  Other platforms
+ * are free to override it with a machine vector.
+ */
+char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
+{
+	return (char *)__IA64_UNCACHED_OFFSET;
+}
+
+/**
+ * pci_mmap_legacy_page_range - map legacy memory space to userland
+ * @bus: bus whose legacy space we're mapping
+ * @vma: vma passed in by mmap
+ *
+ * Map legacy memory space for this device back to userspace using a machine
+ * vector to get the base address.
+ */
+int
+pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
+			   enum pci_mmap_state mmap_state)
+{
+	unsigned long size = vma->vm_end - vma->vm_start;
+	pgprot_t prot;
+	char *addr;
+
+	/* We only support mmap'ing of legacy memory space */
+	if (mmap_state != pci_mmap_mem)
+		return -ENOSYS;
+
+	/*
+	 * Avoid attribute aliasing.  See Documentation/ia64/aliasing.txt
+	 * for more details.
+	 */
+	if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
+		return -EINVAL;
+	prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
+				    vma->vm_page_prot);
+
+	addr = pci_get_legacy_mem(bus);
+	if (IS_ERR(addr))
+		return PTR_ERR(addr);
+
+	vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
+	vma->vm_page_prot = prot;
+
+	if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+			    size, vma->vm_page_prot))
+		return -EAGAIN;
+
+	return 0;
+}
+
+/**
+ * ia64_pci_legacy_read - read from legacy I/O space
+ * @bus: bus to read
+ * @port: legacy port value
+ * @val: caller allocated storage for returned value
+ * @size: number of bytes to read
+ *
+ * Simply reads @size bytes from @port and puts the result in @val.
+ *
+ * Again, this (and the write routine) are generic versions that can be
+ * overridden by the platform.  This is necessary on platforms that don't
+ * support legacy I/O routing or that hard fail on legacy I/O timeouts.
+ */
+int ia64_pci_legacy_read(struct pci_bus *bus, u16 port, u32 *val, u8 size)
+{
+	int ret = size;
+
+	switch (size) {
+	case 1:
+		*val = inb(port);
+		break;
+	case 2:
+		*val = inw(port);
+		break;
+	case 4:
+		*val = inl(port);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+/**
+ * ia64_pci_legacy_write - perform a legacy I/O write
+ * @bus: bus pointer
+ * @port: port to write
+ * @val: value to write
+ * @size: number of bytes to write from @val
+ *
+ * Simply writes @size bytes of @val to @port.
+ */
+int ia64_pci_legacy_write(struct pci_bus *bus, u16 port, u32 val, u8 size)
+{
+	int ret = size;
+
+	switch (size) {
+	case 1:
+		outb(val, port);
+		break;
+	case 2:
+		outw(val, port);
+		break;
+	case 4:
+		outl(val, port);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+/**
+ * set_pci_cacheline_size - determine cacheline size for PCI devices
+ *
+ * We want to use the line-size of the outer-most cache.  We assume
+ * that this line-size is the same for all CPUs.
+ *
+ * Code mostly taken from arch/ia64/kernel/palinfo.c:cache_info().
+ */
+static void __init set_pci_dfl_cacheline_size(void)
+{
+	unsigned long levels, unique_caches;
+	long status;
+	pal_cache_config_info_t cci;
+
+	status = ia64_pal_cache_summary(&levels, &unique_caches);
+	if (status != 0) {
+		pr_err("%s: ia64_pal_cache_summary() failed "
+			"(status=%ld)\n", __func__, status);
+		return;
+	}
+
+	status = ia64_pal_cache_config_info(levels - 1,
+				/* cache_type (data_or_unified)= */ 2, &cci);
+	if (status != 0) {
+		pr_err("%s: ia64_pal_cache_config_info() failed "
+			"(status=%ld)\n", __func__, status);
+		return;
+	}
+	pci_dfl_cache_line_size = (1 << cci.pcci_line_size) / 4;
+}
+
+u64 ia64_dma_get_required_mask(struct device *dev)
+{
+	u32 low_totalram = ((max_pfn - 1) << PAGE_SHIFT);
+	u32 high_totalram = ((max_pfn - 1) >> (32 - PAGE_SHIFT));
+	u64 mask;
+
+	if (!high_totalram) {
+		/* convert to mask just covering totalram */
+		low_totalram = (1 << (fls(low_totalram) - 1));
+		low_totalram += low_totalram - 1;
+		mask = low_totalram;
+	} else {
+		high_totalram = (1 << (fls(high_totalram) - 1));
+		high_totalram += high_totalram - 1;
+		mask = (((u64)high_totalram) << 32) + 0xffffffff;
+	}
+	return mask;
+}
+EXPORT_SYMBOL_GPL(ia64_dma_get_required_mask);
+
+u64 dma_get_required_mask(struct device *dev)
+{
+	return platform_dma_get_required_mask(dev);
+}
+EXPORT_SYMBOL_GPL(dma_get_required_mask);
+
+static int __init pcibios_init(void)
+{
+	set_pci_dfl_cacheline_size();
+	return 0;
+}
+
+subsys_initcall(pcibios_init);