sh: support PCI domains.

Newer SH parts are now commonly shipping with multiple controllers, so
we wire up PCI domain support to deal with them. Shamelessly cloned from
the MIPS implementation.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 15 insertions, 2 deletions

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);
 }