1 // SPDX-License-Identifier: GPL-2.0-only
3  * Code borrowed from powerpc/kernel/pci-common.c
15 #include <linux/pci-acpi.h>
16 #include <linux/pci-ecam.h>
33  * raw_pci_read/write - Platform-specific PCI config space access.
42 	return b->ops->read(b, devfn, reg, len, val);  in raw_pci_read()
52 	return b->ops->write(b, devfn, reg, len, val);  in raw_pci_write()
59 	return dev_to_node(&bus->dev);  in pcibus_to_node()
69 	struct pci_config_window	*cfg;	/* config space mapping */  member
74 	struct pci_config_window *cfg = bus->sysdata;  in acpi_pci_bus_find_domain_nr()  local
75 	struct acpi_device *adev = to_acpi_device(cfg->parent);  in acpi_pci_bus_find_domain_nr()
78 	return root->segment;  in acpi_pci_bus_find_domain_nr()
83 	struct pci_config_window *cfg;  in pcibios_root_bridge_prepare()  local
90 	cfg = bridge->bus->sysdata;  in pcibios_root_bridge_prepare()
93 	 * On Hyper-V there is no corresponding ACPI device for a root bridge,  in pcibios_root_bridge_prepare()
94 	 * therefore ->parent is set as NULL by the driver. And set 'adev' as  in pcibios_root_bridge_prepare()
97 	if (!cfg->parent)  in pcibios_root_bridge_prepare()
100 		adev = to_acpi_device(cfg->parent);  in pcibios_root_bridge_prepare()
102 	bus_dev = &bridge->bus->dev;  in pcibios_root_bridge_prepare()
104 	ACPI_COMPANION_SET(&bridge->dev, adev);  in pcibios_root_bridge_prepare()
116 	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {  in pci_acpi_root_prepare_resources()
117 		if (!(entry->res->flags & IORESOURCE_WINDOW))  in pci_acpi_root_prepare_resources()
124  * Lookup the bus range for the domain in MCFG, and set up config space
130 	struct device *dev = &root->device->dev;  in pci_acpi_setup_ecam_mapping()
131 	struct resource *bus_res = &root->secondary;  in pci_acpi_setup_ecam_mapping()
132 	u16 seg = root->segment;  in pci_acpi_setup_ecam_mapping()
136 	struct pci_config_window *cfg;  in pci_acpi_setup_ecam_mapping()  local
148 			 dev_name(&adev->dev));  in pci_acpi_setup_ecam_mapping()
153 	cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);  in pci_acpi_setup_ecam_mapping()
154 	if (IS_ERR(cfg)) {  in pci_acpi_setup_ecam_mapping()
156 			PTR_ERR(cfg));  in pci_acpi_setup_ecam_mapping()
160 	return cfg;  in pci_acpi_setup_ecam_mapping()
169 	pci_ecam_free(ri->cfg);  in pci_acpi_generic_release_info()
170 	kfree(ci->ops);  in pci_acpi_generic_release_info()
192 	ri->cfg = pci_acpi_setup_ecam_mapping(root);  in pci_acpi_scan_root()
193 	if (!ri->cfg) {  in pci_acpi_scan_root()
199 	root_ops->release_info = pci_acpi_generic_release_info;  in pci_acpi_scan_root()
200 	root_ops->prepare_resources = pci_acpi_root_prepare_resources;  in pci_acpi_scan_root()
201 	root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;  in pci_acpi_scan_root()
202 	bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);  in pci_acpi_scan_root()
208 	if (host->preserve_config)  in pci_acpi_scan_root()
217 	list_for_each_entry(child, &bus->children, node)  in pci_acpi_scan_root()