void pci_set_bus_of_node(struct pci_bus *bus)
{
if (bus->self == NULL)
bus->dev.of_node = pcibios_get_phb_of_node(bus);
else
bus->dev.of_node = of_node_get(bus->self->dev.of_node);
}
int pseries_root_bridge_prepare(struct pci_host_bridge *bridge)
{
struct device_node *dn, *pdn;
struct pci_bus *bus;
const __be32 *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 = 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 (be32_to_cpup(pcie_link_speed_stats)) {
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 (be32_to_cpup(pcie_link_speed_stats)) {
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;
}
static struct device_node *__pcibios_get_phb_of_node(struct pci_bus *bus)
{
/* This should only be called for PHBs */
if (WARN_ON(bus->self || bus->parent))
return NULL;
if (pcibios_get_phb_of_node)
return pcibios_get_phb_of_node(bus);
/* Look for a node pointer in either the intermediary device we
* create above the root bus or it's own parent. Normally only
* the later is populated.
*/
if (bus->bridge->of_node)
return of_node_get(bus->bridge->of_node);
if (bus->bridge->parent && bus->bridge->parent->of_node)
return of_node_get(bus->bridge->parent->of_node);
return NULL;
}
