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9#include <linux/acpi.h>
10#include <linux/init.h>
11#include <linux/io.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/of_pci.h>
15#include <linux/of_platform.h>
16#include <linux/pci.h>
17#include <linux/pci-acpi.h>
18#include <linux/pci-ecam.h>
19#include <linux/slab.h>
20
21#ifdef CONFIG_ACPI
22
23
24
25int pcibios_alloc_irq(struct pci_dev *dev)
26{
27 if (!acpi_disabled)
28 acpi_pci_irq_enable(dev);
29
30 return 0;
31}
32#endif
33
34
35
36
37int raw_pci_read(unsigned int domain, unsigned int bus,
38 unsigned int devfn, int reg, int len, u32 *val)
39{
40 struct pci_bus *b = pci_find_bus(domain, bus);
41
42 if (!b)
43 return PCIBIOS_DEVICE_NOT_FOUND;
44 return b->ops->read(b, devfn, reg, len, val);
45}
46
47int raw_pci_write(unsigned int domain, unsigned int bus,
48 unsigned int devfn, int reg, int len, u32 val)
49{
50 struct pci_bus *b = pci_find_bus(domain, bus);
51
52 if (!b)
53 return PCIBIOS_DEVICE_NOT_FOUND;
54 return b->ops->write(b, devfn, reg, len, val);
55}
56
57#ifdef CONFIG_NUMA
58
59int pcibus_to_node(struct pci_bus *bus)
60{
61 return dev_to_node(&bus->dev);
62}
63EXPORT_SYMBOL(pcibus_to_node);
64
65#endif
66
67#ifdef CONFIG_ACPI
68
69struct acpi_pci_generic_root_info {
70 struct acpi_pci_root_info common;
71 struct pci_config_window *cfg;
72};
73
74int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
75{
76 struct pci_config_window *cfg = bus->sysdata;
77 struct acpi_device *adev = to_acpi_device(cfg->parent);
78 struct acpi_pci_root *root = acpi_driver_data(adev);
79
80 return root->segment;
81}
82
83int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
84{
85 struct pci_config_window *cfg;
86 struct acpi_device *adev;
87 struct device *bus_dev;
88
89 if (acpi_disabled)
90 return 0;
91
92 cfg = bridge->bus->sysdata;
93
94
95
96
97
98
99 if (!cfg->parent)
100 adev = NULL;
101 else
102 adev = to_acpi_device(cfg->parent);
103
104 bus_dev = &bridge->bus->dev;
105
106 ACPI_COMPANION_SET(&bridge->dev, adev);
107 set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
108
109 return 0;
110}
111
112static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
113{
114 struct resource_entry *entry, *tmp;
115 int status;
116
117 status = acpi_pci_probe_root_resources(ci);
118 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
119 if (!(entry->res->flags & IORESOURCE_WINDOW))
120 resource_list_destroy_entry(entry);
121 }
122 return status;
123}
124
125
126
127
128
129static struct pci_config_window *
130pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
131{
132 struct device *dev = &root->device->dev;
133 struct resource *bus_res = &root->secondary;
134 u16 seg = root->segment;
135 const struct pci_ecam_ops *ecam_ops;
136 struct resource cfgres;
137 struct acpi_device *adev;
138 struct pci_config_window *cfg;
139 int ret;
140
141 ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
142 if (ret) {
143 dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
144 return NULL;
145 }
146
147 adev = acpi_resource_consumer(&cfgres);
148 if (adev)
149 dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
150 dev_name(&adev->dev));
151 else
152 dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
153 &cfgres);
154
155 cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
156 if (IS_ERR(cfg)) {
157 dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
158 PTR_ERR(cfg));
159 return NULL;
160 }
161
162 return cfg;
163}
164
165
166static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
167{
168 struct acpi_pci_generic_root_info *ri;
169
170 ri = container_of(ci, struct acpi_pci_generic_root_info, common);
171 pci_ecam_free(ri->cfg);
172 kfree(ci->ops);
173 kfree(ri);
174}
175
176
177struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
178{
179 struct acpi_pci_generic_root_info *ri;
180 struct pci_bus *bus, *child;
181 struct acpi_pci_root_ops *root_ops;
182 struct pci_host_bridge *host;
183
184 ri = kzalloc(sizeof(*ri), GFP_KERNEL);
185 if (!ri)
186 return NULL;
187
188 root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL);
189 if (!root_ops) {
190 kfree(ri);
191 return NULL;
192 }
193
194 ri->cfg = pci_acpi_setup_ecam_mapping(root);
195 if (!ri->cfg) {
196 kfree(ri);
197 kfree(root_ops);
198 return NULL;
199 }
200
201 root_ops->release_info = pci_acpi_generic_release_info;
202 root_ops->prepare_resources = pci_acpi_root_prepare_resources;
203 root_ops->pci_ops = (struct pci_ops *)&ri->cfg->ops->pci_ops;
204 bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
205 if (!bus)
206 return NULL;
207
208
209 host = pci_find_host_bridge(bus);
210 if (host->preserve_config)
211 pci_bus_claim_resources(bus);
212
213
214
215
216
217 pci_assign_unassigned_root_bus_resources(bus);
218
219 list_for_each_entry(child, &bus->children, node)
220 pcie_bus_configure_settings(child);
221
222 return bus;
223}
224
225void pcibios_add_bus(struct pci_bus *bus)
226{
227 acpi_pci_add_bus(bus);
228}
229
230void pcibios_remove_bus(struct pci_bus *bus)
231{
232 acpi_pci_remove_bus(bus);
233}
234
235#endif
236