PCI: Add pci_remap_iospace() to map bus I/O resources

Add pci_remap_iospace() to map bus I/O resources into the CPU virtual
address space.  Architectures with special needs may provide their own
version, but most should be able to use this one.

This function is useful for PCI host bridge drivers that need to map the
PCI I/O resources into virtual memory space.

[bhelgaas: phys_addr description, drop temporary "err" variable]
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
CC: Arnd Bergmann <arnd@arndb.de>

1 files changed, 31 insertions, 0 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d36f35ff6c5d..6e994fc077f4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2704,6 +2704,37 @@ 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 of range to be mapped
+ *
+ *      Remap the memory mapped I/O space described by the @res
+ *      and the CPU physical address @phys_addr into virtual address space.
+ *      Only architectures that have memory mapped IO functions defined
+ *      (and the PCI_IOBASE value defined) should call this function.
+ */
+int __weak pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr)
+{
+#if defined(PCI_IOBASE) && defined(CONFIG_MMU)
+        unsigned long vaddr = (unsigned long)PCI_IOBASE + res->start;
+
+        if (!(res->flags & IORESOURCE_IO))
+                return -EINVAL;
+
+        if (res->end > IO_SPACE_LIMIT)
+                return -EINVAL;
+
+        return ioremap_page_range(vaddr, vaddr + resource_size(res), 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_ONCE(1, "This architecture does not support memory mapped I/O\n");
+        return -ENODEV;
+#endif
+}
+
 static void __pci_set_master(struct pci_dev *dev, bool enable)
 {
         u16 old_cmd, cmd;