1 files changed, 60 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/pci.c b/arch/ppc64/kernel/pci.c
index 446b4654883..8447dcc2c2b 100644
--- a/arch/ppc64/kernel/pci.c
+++ b/arch/ppc64/kernel/pci.c
@@ -21,6 +21,7 @@
 #include <linux/bootmem.h>
 #include <linux/mm.h>
 #include <linux/list.h>
+#include <linux/syscalls.h>
 
 #include <asm/processor.h>
 #include <asm/io.h>
@@ -984,3 +985,62 @@ void pci_resource_to_user(const struct pci_dev *dev, int bar,
 }
 
 #endif /* CONFIG_PPC_MULTIPLATFORM */
+
+
+#define IOBASE_BRIDGE_NUMBER    0
+#define IOBASE_MEMORY           1
+#define IOBASE_IO               2
+#define IOBASE_ISA_IO           3
+#define IOBASE_ISA_MEM          4
+
+long sys_pciconfig_iobase(long which, unsigned long in_bus,
+                          unsigned long in_devfn)
+{
+        struct pci_controller* hose;
+        struct list_head *ln;
+        struct pci_bus *bus = NULL;
+        struct device_node *hose_node;
+
+        /* Argh ! Please forgive me for that hack, but that's the
+         * simplest way to get existing XFree to not lockup on some
+         * G5 machines... So when something asks for bus 0 io base
+         * (bus 0 is HT root), we return the AGP one instead.
+         */
+#ifdef CONFIG_PPC_PMAC
+        if (systemcfg->platform == PLATFORM_POWERMAC &&
+            machine_is_compatible("MacRISC4"))
+                if (in_bus == 0)
+                        in_bus = 0xf0;
+#endif /* CONFIG_PPC_PMAC */
+
+        /* That syscall isn't quite compatible with PCI domains, but it's
+         * used on pre-domains setup. We return the first match
+         */
+
+        for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
+                bus = pci_bus_b(ln);
+                if (in_bus >= bus->number && in_bus < (bus->number + bus->subordinate))
+                        break;
+                bus = NULL;
+        }
+        if (bus == NULL || bus->sysdata == NULL)
+                return -ENODEV;
+
+        hose_node = (struct device_node *)bus->sysdata;
+        hose = PCI_DN(hose_node)->phb;
+
+        switch (which) {
+        case IOBASE_BRIDGE_NUMBER:
+                return (long)hose->first_busno;
+        case IOBASE_MEMORY:
+                return (long)hose->pci_mem_offset;
+        case IOBASE_IO:
+                return (long)hose->io_base_phys;
+        case IOBASE_ISA_IO:
+                return (long)isa_io_base;
+        case IOBASE_ISA_MEM:
+                return -EINVAL;
+        }
+
+        return -EOPNOTSUPP;
+}