[POWERPC] pci32: Add flags modifying the PCI code behaviour

This adds to the 32 bits PCI code some flags, replacing the old
pci_assign_all_busses global, that allow us to control various
aspects of the PCI probing, such as whether to re-assign all
resources or not, or to not try to assign anything at all.

This also adds the flag x86 already has to avoid ISA alignment
on bridges that don't have ISA forwarding enabled (no legacy
devices on the top level bus) and sets it for PowerMacs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 26 insertions, 3 deletions

diff --git a/include/asm-powerpc/pci-bridge.h b/include/asm-powerpc/pci-bridge.h
index 8245e84836c9..2972f0d3afaa 100644
--- a/include/asm-powerpc/pci-bridge.h
+++ b/include/asm-powerpc/pci-bridge.h
@@ -13,6 +13,26 @@
 
 struct device_node;
 
+extern unsigned int ppc_pci_flags;
+enum {
+        /* Force re-assigning all resources (ignore firmware
+         * setup completely)
+         */
+        PPC_PCI_REASSIGN_ALL_RSRC       = 0x00000001,
+
+        /* Re-assign all bus numbers */
+        PPC_PCI_REASSIGN_ALL_BUS        = 0x00000002,
+
+        /* Do not try to assign, just use existing setup */
+        PPC_PCI_PROBE_ONLY              = 0x00000004,
+
+        /* Don't bother with ISA alignment unless the bridge has
+         * ISA forwarding enabled
+         */
+        PPC_PCI_CAN_SKIP_ISA_ALIGN      = 0x00000008,
+};
+
+
 /*
  * Structure of a PCI controller (host bridge)
  */
diff --git a/include/asm-powerpc/pci.h b/include/asm-powerpc/pci.h
index 7b11765c6865..47cc117a1422 100644
--- a/include/asm-powerpc/pci.h
+++ b/include/asm-powerpc/pci.h
@@ -38,9 +38,12 @@ struct pci_dev;
  * Set this to 1 if you want the kernel to re-assign all PCI
  * bus numbers
  */
-extern int pci_assign_all_buses;
-#define pcibios_assign_all_busses()     (pci_assign_all_buses)
-
+#ifdef CONFIG_PPC64
+#define pcibios_assign_all_busses()     0
+#else
+#define pcibios_assign_all_busses()     (ppc_pci_flags & \
+                                         PPC_PCI_REASSIGN_ALL_BUS)
+#endif
 #define pcibios_scan_all_fns(a, b)      0
 
 static inline void pcibios_set_master(struct pci_dev *dev)