powerpc/powernv: Fetch PHB bus range from dev-tree

The patch enables fetching bus range from device-tree for the
specific PHB. If we can't get that from device-tree, the default
range [0 255] will be used.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 10 insertions, 3 deletions

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index 9cccdc7007d4..f472228148cc 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -1109,6 +1109,7 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
         unsigned long size, m32map_off, iomap_off, pemap_off;
         const u64 *prop64;
         const u32 *prop32;
+        int len;
         u64 phb_id;
         void *aux;
         long rc;
@@ -1140,9 +1141,15 @@ void __init pnv_pci_init_ioda_phb(struct device_node *np,
         }
 
         spin_lock_init(&phb->lock);
-        /* XXX Use device-tree */
-        hose->first_busno = 0;
-        hose->last_busno = 0xff;
+        prop32 = of_get_property(np, "bus-range", &len);
+        if (prop32 && len == 8) {
+                hose->first_busno = prop32[0];
+                hose->last_busno = prop32[1];
+        } else {
+                pr_warn("  Broken <bus-range> on %s\n", np->full_name);
+                hose->first_busno = 0;
+                hose->last_busno = 0xff;
+        }
         hose->private_data = phb;
         phb->hub_id = hub_id;
         phb->opal_id = phb_id;