1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
10 #include <linux/pci-acpi.h>
11 #include <linux/pci-ecam.h>
19 	struct pci_config_window *cfg;  member
30 	struct device *bus_dev = &bridge->bus->dev;  in pcibios_root_bridge_prepare()
31 	struct pci_config_window *cfg = bridge->bus->sysdata;  in pcibios_root_bridge_prepare()  local
34 		adev = to_acpi_device(cfg->parent);  in pcibios_root_bridge_prepare()
36 	ACPI_COMPANION_SET(&bridge->dev, adev);  in pcibios_root_bridge_prepare()
37 	set_dev_node(bus_dev, pa_to_nid(cfg->res.start));  in pcibios_root_bridge_prepare()
44 	struct pci_config_window *cfg = bus->sysdata;  in acpi_pci_bus_find_domain_nr()  local
45 	struct acpi_device *adev = to_acpi_device(cfg->parent);  in acpi_pci_bus_find_domain_nr()
48 	return root->segment;  in acpi_pci_bus_find_domain_nr()
56 	pci_ecam_free(info->cfg);  in acpi_release_root_info()
57 	kfree(ci->ops);  in acpi_release_root_info()
65 	struct acpi_device *device = ci->bridge;  in acpi_prepare_root_resources()
69 		resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {  in acpi_prepare_root_resources()
70 			if (entry->res->flags & IORESOURCE_MEM) {  in acpi_prepare_root_resources()
71 				entry->offset = ci->root->mcfg_addr & GENMASK_ULL(63, 40);  in acpi_prepare_root_resources()
72 				entry->res->start |= entry->offset;  in acpi_prepare_root_resources()
73 				entry->res->end   |= entry->offset;  in acpi_prepare_root_resources()
79 	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {  in acpi_prepare_root_resources()
80 		dev_dbg(&device->dev,  in acpi_prepare_root_resources()
81 			   "host bridge window %pR (ignored)\n", entry->res);  in acpi_prepare_root_resources()
89  * Create a PCI config space window
90  *  - reserve mem region
91  *  - alloc struct pci_config_window with space for all mappings
92  *  - ioremap the config space
99 	struct pci_config_window *cfg;  in arch_pci_ecam_create()  local
101 	if (busr->start > busr->end)  in arch_pci_ecam_create()
102 		return ERR_PTR(-EINVAL);  in arch_pci_ecam_create()
104 	cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);  in arch_pci_ecam_create()
105 	if (!cfg)  in arch_pci_ecam_create()
106 		return ERR_PTR(-ENOMEM);  in arch_pci_ecam_create()
108 	cfg->parent = dev;  in arch_pci_ecam_create()
109 	cfg->ops = ops;  in arch_pci_ecam_create()
110 	cfg->busr.start = busr->start;  in arch_pci_ecam_create()
111 	cfg->busr.end = busr->end;  in arch_pci_ecam_create()
112 	cfg->busr.flags = IORESOURCE_BUS;  in arch_pci_ecam_create()
113 	bus_range = resource_size(cfgres) >> ops->bus_shift;  in arch_pci_ecam_create()
115 	bsz = 1 << ops->bus_shift;  in arch_pci_ecam_create()
117 	cfg->res.start = cfgres->start;  in arch_pci_ecam_create()
118 	cfg->res.end = cfgres->end;  in arch_pci_ecam_create()
119 	cfg->res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;  in arch_pci_ecam_create()
120 	cfg->res.name = "PCI ECAM";  in arch_pci_ecam_create()
122 	conflict = request_resource_conflict(&iomem_resource, &cfg->res);  in arch_pci_ecam_create()
124 		err = -EBUSY;  in arch_pci_ecam_create()
126 			&cfg->res, conflict->name, conflict);  in arch_pci_ecam_create()
130 	cfg->win = pci_remap_cfgspace(cfgres->start, bus_range * bsz);  in arch_pci_ecam_create()
131 	if (!cfg->win)  in arch_pci_ecam_create()
134 	if (ops->init) {  in arch_pci_ecam_create()
135 		err = ops->init(cfg);  in arch_pci_ecam_create()
139 	dev_info(dev, "ECAM at %pR for %pR\n", &cfg->res, &cfg->busr);  in arch_pci_ecam_create()
141 	return cfg;  in arch_pci_ecam_create()
144 	err = -ENOMEM;  in arch_pci_ecam_create()
147 	pci_ecam_free(cfg);  in arch_pci_ecam_create()
152  * Lookup the bus range for the domain in MCFG, and set up config space
159 	u16 seg = root->segment;  in pci_acpi_setup_ecam_mapping()
160 	struct device *dev = &root->device->dev;  in pci_acpi_setup_ecam_mapping()
162 	struct resource *bus_res = &root->secondary;  in pci_acpi_setup_ecam_mapping()
163 	struct pci_config_window *cfg;  in pci_acpi_setup_ecam_mapping()  local
170 		root->mcfg_addr = mcfg_addr_init(0);  in pci_acpi_setup_ecam_mapping()
173 	bus_shift = ecam_ops->bus_shift ? : 20;  in pci_acpi_setup_ecam_mapping()
176 		cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);  in pci_acpi_setup_ecam_mapping()
178 		cfgres.start = root->mcfg_addr + (bus_res->start << bus_shift);  in pci_acpi_setup_ecam_mapping()
179 		cfgres.end = cfgres.start + (resource_size(bus_res) << bus_shift) - 1;  in pci_acpi_setup_ecam_mapping()
180 		cfgres.end |= BIT(28) + (((PCI_CFG_SPACE_EXP_SIZE - 1) & 0xf00) << 16);  in pci_acpi_setup_ecam_mapping()
182 		cfg = arch_pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);  in pci_acpi_setup_ecam_mapping()
185 	if (IS_ERR(cfg)) {  in pci_acpi_setup_ecam_mapping()
186 		dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res, PTR_ERR(cfg));  in pci_acpi_setup_ecam_mapping()
190 	return cfg;  in pci_acpi_setup_ecam_mapping()
198 	int domain = root->segment;  in pci_acpi_scan_root()
199 	int busnum = root->secondary.start;  in pci_acpi_scan_root()
213 	info->cfg = pci_acpi_setup_ecam_mapping(root);  in pci_acpi_scan_root()
214 	if (!info->cfg) {  in pci_acpi_scan_root()
220 	root_ops->release_info = acpi_release_root_info;  in pci_acpi_scan_root()
221 	root_ops->prepare_resources = acpi_prepare_root_resources;  in pci_acpi_scan_root()
222 	root_ops->pci_ops = (struct pci_ops *)&info->cfg->ops->pci_ops;  in pci_acpi_scan_root()
226 		memcpy(bus->sysdata, info->cfg, sizeof(struct pci_config_window));  in pci_acpi_scan_root()
233 					   &info->common, info->cfg);  in pci_acpi_scan_root()
242 		list_for_each_entry(child, &bus->children, node)  in pci_acpi_scan_root()