[POWERPC] Fixup resources on pci_bus for PCIe PHB when no device is connected

On the 85xx/86xx PCIe controllers if there is no device connected to the
PHB we will still allocate a pci_bus for downstream bus of the virtual
P2P bridge. However the resources allocated to the downstream bus are not
correct and so we just mimic the resources from the upstream pci_bus.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

4 files changed, 17 insertions, 1 deletions

diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index 2539bb560694..9b559ebc66f8 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
@@ -272,4 +272,5 @@ define_machine(mpc85xx_cds) {
         .restart        = mpc85xx_restart,
         .calibrate_decr = generic_calibrate_decr,
         .progress       = udbg_progress,
+        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 };
diff --git a/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
index e67e10d3272f..e9eaa0749ae6 100644
--- a/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
+++ b/arch/powerpc/platforms/86xx/mpc86xx_hpcn.c
@@ -431,7 +431,6 @@ mpc86xx_time_init(void)
         return 0;
 }
 
-
 define_machine(mpc86xx_hpcn) {
         .name                   = "MPC86xx HPCN",
         .probe                  = mpc86xx_hpcn_probe,
@@ -443,4 +442,5 @@ define_machine(mpc86xx_hpcn) {
         .time_init              = mpc86xx_time_init,
         .calibrate_decr         = generic_calibrate_decr,
         .progress               = udbg_progress,
+        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 };
diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 2eefcde5b0da..faafae601a72 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -142,6 +142,20 @@ int __init fsl_pcie_check_link(struct pci_controller *hose)
         return 0;
 }
 
+void fsl_pcibios_fixup_bus(struct pci_bus *bus)
+{
+        struct pci_controller *hose = (struct pci_controller *) bus->sysdata;
+        int i;
+
+        /* deal with bogus pci_bus when we don't have anything connected on PCIe */
+        if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
+                if (bus->parent) {
+                        for (i = 0; i < 4; ++i)
+                                bus->resource[i] = bus->parent->resource[i];
+                }
+        }
+}
+
 int __init fsl_add_bridge(struct device_node *dev, int is_primary)
 {
         int len;
diff --git a/arch/powerpc/sysdev/fsl_pci.h b/arch/powerpc/sysdev/fsl_pci.h
index 700d47827994..37b04ad26571 100644
--- a/arch/powerpc/sysdev/fsl_pci.h
+++ b/arch/powerpc/sysdev/fsl_pci.h
@@ -82,6 +82,7 @@ struct ccsr_pci {
 };
 
 extern int fsl_add_bridge(struct device_node *dev, int is_primary);
+extern void fsl_pcibios_fixup_bus(struct pci_bus *bus);
 
 #endif /* __POWERPC_FSL_PCI_H */
 #endif /* __KERNEL__ */