3 files changed, 31 insertions, 3 deletions

diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 352879c1b86b..bae53831c06b 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -826,11 +826,15 @@ config MAPLE
 config PCI
         bool "PCI support"
         depends on SYS_SUPPORTS_PCI
+        select PCI_DOMAINS
         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. If you have PCI, say Y, otherwise N.
 
+config PCI_DOMAINS
+        bool
+
 source "drivers/pci/pcie/Kconfig"
 
 source "drivers/pci/Kconfig"
diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
index 82e59bc6210e..45a15cab01df 100644
--- a/arch/sh/drivers/pci/pci.c
+++ b/arch/sh/drivers/pci/pci.c
@@ -33,15 +33,22 @@ static int pci_initialized;
 static void __devinit pcibios_scanbus(struct pci_channel *hose)
 {
         static int next_busno;
+        static int need_domain_info;
         struct pci_bus *bus;
 
         bus = pci_scan_bus(next_busno, hose->pci_ops, hose);
+        hose->bus = bus;
+
+        need_domain_info = need_domain_info || hose->index;
+        hose->need_domain_info = need_domain_info;
         if (bus) {
                 next_busno = bus->subordinate + 1;
                 /* Don't allow 8-bit bus number overflow inside the hose -
                    reserve some space for bridges. */
-                if (next_busno > 224)
+                if (next_busno > 224) {
                         next_busno = 0;
+                        need_domain_info = 1;
+                }
 
                 pci_bus_size_bridges(bus);
                 pci_bus_assign_resources(bus);
@@ -307,9 +314,15 @@ static void __iomem *ioport_map_pci(struct pci_dev *dev,
 {
         struct pci_channel *chan = dev->sysdata;
 
-        if (!chan->io_map_base)
+        if (unlikely(!chan->io_map_base)) {
                 chan->io_map_base = generic_io_base;
 
+                if (pci_domains_supported)
+                        panic("To avoid data corruption io_map_base MUST be "
+                              "set with multiple PCI domains.");
+        }
+
+
         return (void __iomem *)(chan->io_map_base + port);
 }
 
diff --git a/arch/sh/include/asm/pci.h b/arch/sh/include/asm/pci.h
index f362d8a045e7..d124a009889f 100644
--- a/arch/sh/include/asm/pci.h
+++ b/arch/sh/include/asm/pci.h
@@ -15,6 +15,7 @@
  */
 struct pci_channel {
         struct pci_channel      *next;
+        struct pci_bus          *bus;
 
         struct pci_ops          *pci_ops;
         struct resource         *io_resource;
@@ -24,8 +25,10 @@ struct pci_channel {
         unsigned long           mem_offset;
 
         unsigned long           reg_base;
-
         unsigned long           io_map_base;
+
+        unsigned int            index;
+        unsigned int            need_domain_info;
 };
 
 extern void register_pci_controller(struct pci_channel *hose);
@@ -108,6 +111,14 @@ extern void pcibios_resource_to_bus(struct pci_dev *dev,
 extern void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
                                     struct pci_bus_region *region);
 
+#define pci_domain_nr(bus) ((struct pci_channel *)(bus)->sysdata)->index
+
+static inline int pci_proc_domain(struct pci_bus *bus)
+{
+        struct pci_channel *hose = bus->sysdata;
+        return hose->need_domain_info;
+}
+
 /* Chances are this interrupt is wired PC-style ...  */
 static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 {