---
 drivers/pci/pci.c   | 33 +++++++++++++++++++++++++++++++++
 include/linux/pci.h |  3 +++
 2 files changed, 36 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 29d1775..76d21b6 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c

@@ -2707,6 +2707,39 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
 }
 EXPORT_SYMBOL(pci_request_regions_exclusive);

+/**
+ *     pci_remap_iospace - Remap the memory mapped I/O space
+ *     @res: Resource describing the I/O space
+ *     @phys_addr: physical address where the range will be mapped.
+ *
+ *     Remap the memory mapped I/O space described by the @res
+ *     into the CPU physical address space. Only architectures
+ *     that have memory mapped IO defined (and hence PCI_IOBASE)
+ *     should call this function.
+ */
+int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
+{
+       int err = -ENODEV;
+
+#ifdef PCI_IOBASE
+       if (!(res->flags & IORESOURCE_IO))
+               return -EINVAL;
+
+       if (res->end > IO_SPACE_LIMIT)
+               return -EINVAL;
+
+       err = ioremap_page_range(res->start + (unsigned long)PCI_IOBASE,
+                               res->end + 1 + (unsigned long)PCI_IOBASE,
+                               phys_addr, pgprot_device(PAGE_KERNEL));
+#else
+       /* this architecture does not have memory mapped I/O space,
+          so this function should never be called */
+       WARN_ON(1);
+#endif
+
+       return err;
+}
+
 static void __pci_set_master(struct pci_dev *dev, bool enable)
 {
        u16 old_cmd, cmd;

diff --git a/include/linux/pci.h b/include/linux/pci.h
index e1e0d80..988c2f5 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h

@@ -1098,6 +1098,9 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
                                                  resource_size_t),
                        void *alignf_data);

+
+int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
+
 static inline dma_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
 {
        struct pci_bus_region region;
--

2.0.4


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