3  *  pci_root.c - ACPI PCI Root Bridge Driver ($Revision: 40 $)
28 #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
229 	status = acpi_pci_query_osc(root, flags, NULL);  in acpi_pci_osc_support()
236 	struct acpi_pci_root *root;  in acpi_pci_find_root()  local
243 	root = acpi_driver_data(device);  in acpi_pci_find_root()
245 	return root;  in acpi_pci_find_root()
275 	struct acpi_pci_root *root;  in acpi_get_pci_dev()  local
279 	 * Walk up the ACPI CA namespace until we reach a PCI root bridge.  in acpi_get_pci_dev()
296 	root = acpi_pci_find_root(phandle);  in acpi_get_pci_dev()
297 	if (!root)  in acpi_get_pci_dev()
300 	pbus = root->bus;  in acpi_get_pci_dev()
304 	 * original handle. Assumes that everything between the PCI root  in acpi_get_pci_dev()
342  * acpi_pci_osc_control_set - Request control of PCI root _OSC features.
343  * @handle: ACPI handle of a PCI root bridge (or PCIe Root Complex).
358 	struct acpi_pci_root *root;  in acpi_pci_osc_control_set()  local
369 	root = acpi_pci_find_root(handle);  in acpi_pci_osc_control_set()
370 	if (!root)  in acpi_pci_osc_control_set()
375 	*mask = ctrl | root->osc_control_set;  in acpi_pci_osc_control_set()
377 	if ((root->osc_control_set & ctrl) == ctrl)  in acpi_pci_osc_control_set()
382 		status = acpi_pci_query_osc(root, root->osc_support_set, mask);  in acpi_pci_osc_control_set()
387 		decode_osc_control(root, "platform does not support",  in acpi_pci_osc_control_set()
393 		decode_osc_control(root, "not requesting control; platform does not support",  in acpi_pci_osc_control_set()
400 	capbuf[OSC_SUPPORT_DWORD] = root->osc_support_set;  in acpi_pci_osc_control_set()
404 		root->osc_control_set = *mask;  in acpi_pci_osc_control_set()
411 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm,  in negotiate_os_control()  argument
416 	struct acpi_device *device = root->device;  in negotiate_os_control()
425 		root->osc_control_set = ~OSC_PCI_EXPRESS_PME_CONTROL;  in negotiate_os_control()
426 		decode_osc_control(root, "OS assumes control of",  in negotiate_os_control()
427 				   root->osc_control_set);  in negotiate_os_control()
446 	decode_osc_support(root, "OS supports", support);  in negotiate_os_control()
447 	status = acpi_pci_osc_support(root, support);  in negotiate_os_control()
467 		decode_osc_support(root, "not requesting OS control; OS requires",  in negotiate_os_control()
500 		decode_osc_control(root, "OS now controls", control);  in negotiate_os_control()
511 		decode_osc_control(root, "OS requested", requested);  in negotiate_os_control()
512 		decode_osc_control(root, "platform willing to grant", control);  in negotiate_os_control()
521 		 * root scan.  in negotiate_os_control()
533 	struct acpi_pci_root *root;  in acpi_pci_root_add()  local
539 	root = kzalloc(sizeof(struct acpi_pci_root), GFP_KERNEL);  in acpi_pci_root_add()
540 	if (!root)  in acpi_pci_root_add()
553 	root->secondary.flags = IORESOURCE_BUS;  in acpi_pci_root_add()
554 	status = try_get_root_bridge_busnr(handle, &root->secondary);  in acpi_pci_root_add()
562 		root->secondary.end = 0xFF;  in acpi_pci_root_add()
568 			root->secondary.start = bus;  in acpi_pci_root_add()
570 			root->secondary.start = 0;  in acpi_pci_root_add()
578 	root->device = device;  in acpi_pci_root_add()
579 	root->segment = segment & 0xFFFF;  in acpi_pci_root_add()
582 	device->driver_data = root;  in acpi_pci_root_add()
591 	       root->segment, &root->secondary);  in acpi_pci_root_add()
593 	root->mcfg_addr = acpi_pci_root_get_mcfg_addr(handle);  in acpi_pci_root_add()
596 	negotiate_os_control(root, &no_aspm, is_pcie);  in acpi_pci_root_add()
603 	 * Scan the Root Bridge  in acpi_pci_root_add()
605 	 * Must do this prior to any attempt to bind the root device, as the  in acpi_pci_root_add()
607 	 * thus the root bridge's pci_dev does not exist).  in acpi_pci_root_add()
609 	root->bus = pci_acpi_scan_root(root);  in acpi_pci_root_add()
610 	if (!root->bus) {  in acpi_pci_root_add()
613 			root->segment, (unsigned int)root->secondary.start);  in acpi_pci_root_add()
623 	device_set_wakeup_capable(root->bus->bridge, device->wakeup.flags.valid);  in acpi_pci_root_add()
626 		pcibios_resource_survey_bus(root->bus);  in acpi_pci_root_add()
627 		pci_assign_unassigned_root_bus_resources(root->bus);  in acpi_pci_root_add()
638 		acpi_ioapic_add(root->device->handle);  in acpi_pci_root_add()
642 	pci_bus_add_devices(root->bus);  in acpi_pci_root_add()
650 	kfree(root);  in acpi_pci_root_add()
656 	struct acpi_pci_root *root = acpi_driver_data(device);  in acpi_pci_root_remove()  local
660 	pci_stop_root_bus(root->bus);  in acpi_pci_root_remove()
662 	pci_ioapic_remove(root);  in acpi_pci_root_remove()
663 	device_set_wakeup_capable(root->bus->bridge, false);  in acpi_pci_root_remove()
666 	pci_remove_root_bus(root->bus);  in acpi_pci_root_remove()
667 	WARN_ON(acpi_ioapic_remove(root));  in acpi_pci_root_remove()
673 	kfree(root);  in acpi_pci_root_remove()
686 	struct resource *res1, *res2, *root = NULL;  in acpi_pci_root_validate_resources()  local
690 	root = (type & IORESOURCE_MEM) ? &iomem_resource : &ioport_resource;  in acpi_pci_root_validate_resources()
702 		end = min(res1->end, root->end);  in acpi_pci_root_validate_resources()
816 	struct resource *res, *conflict, *root = NULL;  in pci_acpi_root_add_resources()  local
821 			root = &iomem_resource;  in pci_acpi_root_add_resources()
823 			root = &ioport_resource;  in pci_acpi_root_add_resources()
831 		if (res == root)  in pci_acpi_root_add_resources()
834 		conflict = insert_resource_conflict(root, res);  in pci_acpi_root_add_resources()
879 struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,  in acpi_pci_root_create()  argument
884 	int ret, busnum = root->secondary.start;  in acpi_pci_root_create()
885 	struct acpi_device *device = root->device;  in acpi_pci_root_create()
891 	info->root = root;  in acpi_pci_root_create()
896 		 root->segment, busnum);  in acpi_pci_root_create()
908 	pci_add_resource(&info->resources, &root->secondary);  in acpi_pci_root_create()
915 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL))  in acpi_pci_root_create()
917 	if (!(root->osc_control_set & OSC_PCI_SHPC_NATIVE_HP_CONTROL))  in acpi_pci_root_create()
919 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_AER_CONTROL))  in acpi_pci_root_create()
921 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_PME_CONTROL))  in acpi_pci_root_create()
923 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_LTR_CONTROL))  in acpi_pci_root_create()
925 	if (!(root->osc_control_set & OSC_PCI_EXPRESS_DPC_CONTROL))  in acpi_pci_root_create()