+
+int pseries_root_bridge_prepare(struct pci_host_bridge *bridge)
+{
+ struct device_node *dn, *pdn;
+ struct pci_bus *bus;
+ const uint32_t *pcie_link_speed_stats;
+
+ bus = bridge->bus;
+
+ dn = pcibios_get_phb_of_node(bus);
+ if (!dn)
+ return 0;
+
+ for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(pdn)) {
+ pcie_link_speed_stats = (const uint32_t *) of_get_property(pdn,
+ "ibm,pcie-link-speed-stats", NULL);
+ if (pcie_link_speed_stats)
+ break;
+ }
+
+ of_node_put(pdn);
+
+ if (!pcie_link_speed_stats) {
+ pr_err("no ibm,pcie-link-speed-stats property\n");
+ return 0;
+ }
+
+ switch (pcie_link_speed_stats[0]) {
+ case 0x01:
+ bus->max_bus_speed = PCIE_SPEED_2_5GT;
+ break;
+ case 0x02:
+ bus->max_bus_speed = PCIE_SPEED_5_0GT;
+ break;
+ default:
+ bus->max_bus_speed = PCI_SPEED_UNKNOWN;
+ break;
+ }
+
+ switch (pcie_link_speed_stats[1]) {
+ case 0x01:
+ bus->cur_bus_speed = PCIE_SPEED_2_5GT;
+ break;
+ case 0x02:
+ bus->cur_bus_speed = PCIE_SPEED_5_0GT;
+ break;
+ default:
+ bus->cur_bus_speed = PCI_SPEED_UNKNOWN;
+ break;
+ }
+
+ return 0;
+}