3  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
30 #define ACPI_PCI_ROOT_DEVICE_NAME	"PCI Root Bridge"
62  * acpi_is_root_bridge - determine whether an ACPI CA node is a PCI root bridge
146 static void decode_osc_bits(struct acpi_pci_root *root, char *msg, u32 word,  in decode_osc_bits()  argument
159 	dev_info(&root->device->dev, "_OSC: %s [%s]\n", msg, buf);  in decode_osc_bits()
162 static void decode_osc_support(struct acpi_pci_root *root, char *msg, u32 word)  in decode_osc_support()  argument
164 	decode_osc_bits(root, msg, word, pci_osc_support_bit,  in decode_osc_support()
168 static void decode_osc_control(struct acpi_pci_root *root, char *msg, u32 word)  in decode_osc_control()  argument
170 	decode_osc_bits(root, msg, word, pci_osc_control_bit,  in decode_osc_control()
195 static acpi_status acpi_pci_query_osc(struct acpi_pci_root *root,  in acpi_pci_query_osc()  argument
203 	support |= root->osc_support_set;  in acpi_pci_query_osc()
209 		capbuf[OSC_CONTROL_DWORD] = *control | root->osc_control_set;  in acpi_pci_query_osc()
212 		capbuf[OSC_CONTROL_DWORD] = root->osc_control_set;  in acpi_pci_query_osc()
215 	status = acpi_pci_run_osc(root->device->handle, capbuf, &result);  in acpi_pci_query_osc()
217 		root->osc_support_set = support;  in acpi_pci_query_osc()
224 static acpi_status acpi_pci_osc_support(struct acpi_pci_root *root, u32 flags)  in acpi_pci_osc_support()  argument
226 	return acpi_pci_query_osc(root, flags, NULL);  in acpi_pci_osc_support()
231 	struct acpi_pci_root *root;  in acpi_pci_find_root()  local
238 	root = acpi_driver_data(device);  in acpi_pci_find_root()
240 	return root;  in acpi_pci_find_root()
270 	struct acpi_pci_root *root;  in acpi_get_pci_dev()  local
274 	 * Walk up the ACPI CA namespace until we reach a PCI root bridge.  in acpi_get_pci_dev()
291 	root = acpi_pci_find_root(phandle);  in acpi_get_pci_dev()
292 	if (!root)  in acpi_get_pci_dev()
295 	pbus = root->bus;  in acpi_get_pci_dev()
299 	 * original handle. Assumes that everything between the PCI root  in acpi_get_pci_dev()
337  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
338  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
353 	struct acpi_pci_root *root;  in acpi_pci_osc_control_set()  local
364 	root = acpi_pci_find_root(handle);  in acpi_pci_osc_control_set()
365 	if (!root)  in acpi_pci_osc_control_set()
368 	*mask = ctrl | root->osc_control_set;  in acpi_pci_osc_control_set()
370 	if ((root->osc_control_set & ctrl) == ctrl)  in acpi_pci_osc_control_set()
375 		status = acpi_pci_query_osc(root, root->osc_support_set, mask);  in acpi_pci_osc_control_set()
380 		decode_osc_control(root, "platform does not support",  in acpi_pci_osc_control_set()
386 		decode_osc_control(root, "not requesting control; platform does not support",  in acpi_pci_osc_control_set()
392 	capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;  in acpi_pci_osc_control_set()
398 	root->osc_control_set = *mask;  in acpi_pci_osc_control_set()
402 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,  in negotiate_os_control()  argument
407 	struct acpi_device *device = root->device;  in negotiate_os_control()
416 		root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;  in negotiate_os_control()
417 		decode_osc_control(root, "OS assumes control of",  in negotiate_os_control()
418 				   root->osc_control_set);  in negotiate_os_control()
437 	decode_osc_support(root, "OS supports", support);  in negotiate_os_control()
438 	status = acpi_pci_osc_support(root, support);  in negotiate_os_control()
457 		decode_osc_support(root, "not requesting OS control; OS requires",  in negotiate_os_control()
490 		decode_osc_control(root, "OS now controls", control);  in negotiate_os_control()
501 		decode_osc_control(root, "OS requested", requested);  in negotiate_os_control()
502 		decode_osc_control(root, "platform willing to grant", control);  in negotiate_os_control()
511 		 * root scan.  in negotiate_os_control()
523 	struct acpi_pci_root *root;  in acpi_pci_root_add()  local
529 	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);  in acpi_pci_root_add()
530 	if (!root)  in acpi_pci_root_add()
543 	root->secondary.flags = IORESOURCE_BUS;  in acpi_pci_root_add()
544 	status = try_get_root_bridge_busnr(handle, &root->secondary);  in acpi_pci_root_add()
552 		root->secondary.end = 0xFF;  in acpi_pci_root_add()
558 			root->secondary.start = bus;  in acpi_pci_root_add()
560 			root->secondary.start = 0;  in acpi_pci_root_add()
568 	root->device = device;  in acpi_pci_root_add()
569 	root->segment = segment & 0xFFFF;  in acpi_pci_root_add()
572 	device->driver_data = root;  in acpi_pci_root_add()
581 	       root->segment, &root->secondary);  in acpi_pci_root_add()
583 	root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);  in acpi_pci_root_add()
586 	negotiate_os_control(root, &no_aspm, is_pcie);  in acpi_pci_root_add()
593 	 * Scan the Root Bridge  in acpi_pci_root_add()
595 	 * Must do this prior to any attempt to bind the root device, as the  in acpi_pci_root_add()
597 	 * thus the root bridge's pci_dev does not exist).  in acpi_pci_root_add()
599 	root->bus = pci_acpi_scan_root(root);  in acpi_pci_root_add()
600 	if (!root->bus) {  in acpi_pci_root_add()
603 			root->segment, (unsigned int)root->secondary.start);  in acpi_pci_root_add()
613 	device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid);  in acpi_pci_root_add()
616 		pcibios_resource_survey_bus(root->bus);  in acpi_pci_root_add()
617 		pci_assign_unassigned_root_bus_resources(root->bus);  in acpi_pci_root_add()
628 		acpi_ioapic_add(root->device->handle);  in acpi_pci_root_add()
632 	pci_bus_add_devices(root->bus);  in acpi_pci_root_add()
640 	kfree(root);  in acpi_pci_root_add()
646 	struct acpi_pci_root *root = acpi_driver_data(device);  in acpi_pci_root_remove()  local
650 	pci_stop_root_bus(root->bus);  in acpi_pci_root_remove()
652 	pci_ioapic_remove(root);  in acpi_pci_root_remove()
653 	device_set_wakeup_capable(root->bus->bridge, false);  in acpi_pci_root_remove()
656 	pci_remove_root_bus(root->bus);  in acpi_pci_root_remove()
657 	WARN_ON(acpi_ioapic_remove(root));  in acpi_pci_root_remove()
663 	kfree(root);  in acpi_pci_root_remove()
676 	struct resource *res1, *res2, *root = NULL;  in acpi_pci_root_validate_resources()  local
680 	root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;  in acpi_pci_root_validate_resources()
692 		end = min(res1->end, root->end);  in acpi_pci_root_validate_resources()
804 	struct resource *res, *conflict, *root = NULL;  in pci_acpi_root_add_resources()  local
809 			root = &iomem_resource;  in pci_acpi_root_add_resources()
811 			root = &ioport_resource;  in pci_acpi_root_add_resources()
819 		if (res == root)  in pci_acpi_root_add_resources()
822 		conflict = insert_resource_conflict(root, res);  in pci_acpi_root_add_resources()
867 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,  in acpi_pci_root_create()  argument
872 	int ret, busnum = root->secondary.start;  in acpi_pci_root_create()
873 	struct acpi_device *device = root->device;  in acpi_pci_root_create()
879 	info->root = root;  in acpi_pci_root_create()
884 		 root->segment, busnum);  in acpi_pci_root_create()
896 	pci_add_resource(&info->resources, &root->secondary);  in acpi_pci_root_create()
903 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))  in acpi_pci_root_create()
905 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))  in acpi_pci_root_create()
907 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))  in acpi_pci_root_create()
909 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))  in acpi_pci_root_create()
911 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))  in acpi_pci_root_create()
913 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))  in acpi_pci_root_create()