@@ -346,6 +346,13 @@ config ACPI_PCI_SLOT
i.e., segment/bus/device/function tuples, with physical slots in
the system. If you are unsure, say N.
+config ACPI_PCI_HOST_GENERIC
+ bool
+ help
+ Select this config option from the architecture Kconfig,
+ if it is preferred to enable ACPI PCI host controller driver which
+ has no arch-specific assumptions.
+
config X86_PM_TIMER
bool "Power Management Timer Support" if EXPERT
depends on X86
@@ -532,6 +532,117 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
}
}
+#ifdef CONFIG_ACPI_PCI_HOST_GENERIC
+static void pci_mcfg_release_info(struct acpi_pci_root_info *ci)
+{
+ pci_mmcfg_teardown_map(ci);
+ kfree(ci);
+}
+
+static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
+{
+ struct list_head *list = &ci->resources;
+ struct acpi_device *device = ci->bridge;
+ struct resource_entry *entry, *tmp;
+ unsigned long flags;
+ int ret;
+
+ flags = IORESOURCE_IO | IORESOURCE_MEM;
+ ret = acpi_dev_get_resources(device, list,
+ acpi_dev_filter_resource_type_cb,
+ (void *)flags);
+ if (ret < 0) {
+ dev_warn(&device->dev,
+ "failed to parse _CRS method, error code %d\n", ret);
+ return ret;
+ } else if (ret == 0)
+ dev_dbg(&device->dev,
+ "no IO and memory resources present in _CRS\n");
+
+ resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+ struct resource *res = entry->res;
+
+ if (entry->res->flags & IORESOURCE_DISABLED)
+ resource_list_destroy_entry(entry);
+ else
+ res->name = ci->name;
+
+ if (res->flags & IORESOURCE_IO) {
+ resource_size_t cpu_addr = res->start;
+ resource_size_t pci_addr = cpu_addr - entry->offset;
+ resource_size_t length = resource_size(res);
+ unsigned long port;
+
+ if (pci_register_io_range(cpu_addr, length)) {
+ resource_list_destroy_entry(entry);
+ continue;
+ }
+
+ port = pci_address_to_pio(cpu_addr);
+ if (port == (unsigned long)-1) {
+ resource_list_destroy_entry(entry);
+ continue;
+ }
+
+ res->start = port;
+ res->end = port + length - 1;
+ entry->offset = port - pci_addr;
+
+ if (pci_remap_iospace(res, cpu_addr) < 0)
+ resource_list_destroy_entry(entry);
+ }
+ }
+ return ret;
+}
+
+static struct acpi_pci_root_ops acpi_pci_root_ops = {
+ .init_info = pci_mmcfg_setup_map,
+ .release_info = pci_mcfg_release_info,
+ .prepare_resources = pci_acpi_root_prepare_resources,
+};
+
+/* Root bridge scanning */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+ int node = acpi_get_node(root->device->handle);
+ int domain = root->segment;
+ int busnum = root->secondary.start;
+ struct acpi_pci_root_info *info;
+ struct pci_bus *bus, *child;
+
+ if (domain && !pci_domains_supported) {
+ pr_warn("PCI %04x:%02x: multiple domains not supported.\n",
+ domain, busnum);
+ return NULL;
+ }
+
+ info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
+ if (!info) {
+ dev_err(&root->device->dev,
+ "pci_bus %04x:%02x: ignored (out of memory)\n",
+ domain, busnum);
+ return NULL;
+ }
+
+ acpi_pci_root_ops.pci_ops = pci_mcfg_get_ops(root);
+ bus = acpi_pci_root_create(root, &acpi_pci_root_ops, info, root);
+ if (!bus)
+ return NULL;
+
+ pci_bus_claim_resources(bus);
+ pci_assign_unassigned_bus_resources(bus);
+
+ /*
+ * After the PCI-E bus has been walked and all devices discovered,
+ * configure any settings of the fabric that might be necessary.
+ */
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+
+ return bus;
+}
+#endif /* CONFIG_ACPI_PCI_HOST_GENERIC */
+
static int acpi_pci_root_add(struct acpi_device *device,
const struct acpi_device_id *not_used)
{