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Commit | Line | Data |
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d1e6dc91 LD |
1 | /* |
2 | * Code borrowed from powerpc/kernel/pci-common.c | |
3 | * | |
4 | * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM | |
5 | * Copyright (C) 2014 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | */ | |
12 | ||
a9cb97fe | 13 | #include <linux/acpi.h> |
d1e6dc91 LD |
14 | #include <linux/init.h> |
15 | #include <linux/io.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/mm.h> | |
18 | #include <linux/of_pci.h> | |
19 | #include <linux/of_platform.h> | |
2ab51dde | 20 | #include <linux/pci.h> |
0cb0786b TN |
21 | #include <linux/pci-acpi.h> |
22 | #include <linux/pci-ecam.h> | |
d1e6dc91 LD |
23 | #include <linux/slab.h> |
24 | ||
d1e6dc91 LD |
25 | /* |
26 | * Called after each bus is probed, but before its children are examined | |
27 | */ | |
28 | void pcibios_fixup_bus(struct pci_bus *bus) | |
29 | { | |
30 | /* nothing to do, expected to be removed in the future */ | |
31 | } | |
32 | ||
33 | /* | |
34 | * We don't have to worry about legacy ISA devices, so nothing to do here | |
35 | */ | |
36 | resource_size_t pcibios_align_resource(void *data, const struct resource *res, | |
37 | resource_size_t size, resource_size_t align) | |
38 | { | |
39 | return res->start; | |
40 | } | |
41 | ||
42 | /* | |
d8ed75d5 | 43 | * Try to assign the IRQ number when probing a new device |
d1e6dc91 | 44 | */ |
d8ed75d5 | 45 | int pcibios_alloc_irq(struct pci_dev *dev) |
d1e6dc91 | 46 | { |
d8ed75d5 TN |
47 | if (acpi_disabled) |
48 | dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); | |
49 | #ifdef CONFIG_ACPI | |
50 | else | |
51 | return acpi_pci_irq_enable(dev); | |
52 | #endif | |
d1e6dc91 LD |
53 | |
54 | return 0; | |
55 | } | |
a9cb97fe HG |
56 | |
57 | /* | |
58 | * raw_pci_read/write - Platform-specific PCI config space access. | |
59 | */ | |
60 | int raw_pci_read(unsigned int domain, unsigned int bus, | |
61 | unsigned int devfn, int reg, int len, u32 *val) | |
62 | { | |
f058f4fb TN |
63 | struct pci_bus *b = pci_find_bus(domain, bus); |
64 | ||
65 | if (!b) | |
66 | return PCIBIOS_DEVICE_NOT_FOUND; | |
67 | return b->ops->read(b, devfn, reg, len, val); | |
a9cb97fe HG |
68 | } |
69 | ||
70 | int raw_pci_write(unsigned int domain, unsigned int bus, | |
71 | unsigned int devfn, int reg, int len, u32 val) | |
72 | { | |
f058f4fb TN |
73 | struct pci_bus *b = pci_find_bus(domain, bus); |
74 | ||
75 | if (!b) | |
76 | return PCIBIOS_DEVICE_NOT_FOUND; | |
77 | return b->ops->write(b, devfn, reg, len, val); | |
a9cb97fe HG |
78 | } |
79 | ||
1a2db300 GK |
80 | #ifdef CONFIG_NUMA |
81 | ||
82 | int pcibus_to_node(struct pci_bus *bus) | |
83 | { | |
84 | return dev_to_node(&bus->dev); | |
85 | } | |
86 | EXPORT_SYMBOL(pcibus_to_node); | |
87 | ||
88 | #endif | |
89 | ||
a9cb97fe | 90 | #ifdef CONFIG_ACPI |
2ab51dde | 91 | |
0cb0786b TN |
92 | struct acpi_pci_generic_root_info { |
93 | struct acpi_pci_root_info common; | |
94 | struct pci_config_window *cfg; /* config space mapping */ | |
95 | }; | |
96 | ||
2ab51dde TN |
97 | int acpi_pci_bus_find_domain_nr(struct pci_bus *bus) |
98 | { | |
0cb0786b TN |
99 | struct pci_config_window *cfg = bus->sysdata; |
100 | struct acpi_device *adev = to_acpi_device(cfg->parent); | |
101 | struct acpi_pci_root *root = acpi_driver_data(adev); | |
102 | ||
103 | return root->segment; | |
104 | } | |
105 | ||
106 | int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) | |
107 | { | |
108 | if (!acpi_disabled) { | |
109 | struct pci_config_window *cfg = bridge->bus->sysdata; | |
110 | struct acpi_device *adev = to_acpi_device(cfg->parent); | |
111 | ACPI_COMPANION_SET(&bridge->dev, adev); | |
112 | } | |
113 | ||
2ab51dde TN |
114 | return 0; |
115 | } | |
116 | ||
8fd4391e BH |
117 | static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) |
118 | { | |
119 | struct resource_entry *entry, *tmp; | |
120 | int status; | |
121 | ||
122 | status = acpi_pci_probe_root_resources(ci); | |
123 | resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { | |
124 | if (!(entry->res->flags & IORESOURCE_WINDOW)) | |
125 | resource_list_destroy_entry(entry); | |
126 | } | |
127 | return status; | |
128 | } | |
129 | ||
0cb0786b TN |
130 | /* |
131 | * Lookup the bus range for the domain in MCFG, and set up config space | |
132 | * mapping. | |
133 | */ | |
134 | static struct pci_config_window * | |
135 | pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root) | |
136 | { | |
dfd1972c | 137 | struct device *dev = &root->device->dev; |
0cb0786b TN |
138 | struct resource *bus_res = &root->secondary; |
139 | u16 seg = root->segment; | |
13983eb8 | 140 | struct pci_ecam_ops *ecam_ops; |
0cb0786b | 141 | struct resource cfgres; |
08b1c196 BH |
142 | struct acpi_device *adev; |
143 | struct pci_config_window *cfg; | |
13983eb8 | 144 | int ret; |
0cb0786b | 145 | |
13983eb8 TN |
146 | ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops); |
147 | if (ret) { | |
dfd1972c | 148 | dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res); |
0cb0786b TN |
149 | return NULL; |
150 | } | |
151 | ||
08b1c196 BH |
152 | adev = acpi_resource_consumer(&cfgres); |
153 | if (adev) | |
154 | dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres, | |
155 | dev_name(&adev->dev)); | |
156 | else | |
157 | dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n", | |
158 | &cfgres); | |
159 | ||
13983eb8 | 160 | cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops); |
0cb0786b | 161 | if (IS_ERR(cfg)) { |
dfd1972c BH |
162 | dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res, |
163 | PTR_ERR(cfg)); | |
0cb0786b TN |
164 | return NULL; |
165 | } | |
166 | ||
167 | return cfg; | |
168 | } | |
169 | ||
170 | /* release_info: free resources allocated by init_info */ | |
171 | static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci) | |
172 | { | |
173 | struct acpi_pci_generic_root_info *ri; | |
174 | ||
175 | ri = container_of(ci, struct acpi_pci_generic_root_info, common); | |
176 | pci_ecam_free(ri->cfg); | |
093d24a2 | 177 | kfree(ci->ops); |
0cb0786b TN |
178 | kfree(ri); |
179 | } | |
180 | ||
0cb0786b | 181 | /* Interface called from ACPI code to setup PCI host controller */ |
a9cb97fe HG |
182 | struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) |
183 | { | |
0cb0786b TN |
184 | int node = acpi_get_node(root->device->handle); |
185 | struct acpi_pci_generic_root_info *ri; | |
186 | struct pci_bus *bus, *child; | |
093d24a2 | 187 | struct acpi_pci_root_ops *root_ops; |
0cb0786b TN |
188 | |
189 | ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node); | |
190 | if (!ri) | |
191 | return NULL; | |
192 | ||
093d24a2 TN |
193 | root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node); |
194 | if (!root_ops) | |
195 | return NULL; | |
196 | ||
0cb0786b TN |
197 | ri->cfg = pci_acpi_setup_ecam_mapping(root); |
198 | if (!ri->cfg) { | |
199 | kfree(ri); | |
093d24a2 | 200 | kfree(root_ops); |
0cb0786b TN |
201 | return NULL; |
202 | } | |
203 | ||
093d24a2 | 204 | root_ops->release_info = pci_acpi_generic_release_info; |
8fd4391e | 205 | root_ops->prepare_resources = pci_acpi_root_prepare_resources; |
093d24a2 TN |
206 | root_ops->pci_ops = &ri->cfg->ops->pci_ops; |
207 | bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg); | |
0cb0786b TN |
208 | if (!bus) |
209 | return NULL; | |
210 | ||
211 | pci_bus_size_bridges(bus); | |
212 | pci_bus_assign_resources(bus); | |
213 | ||
214 | list_for_each_entry(child, &bus->children, node) | |
215 | pcie_bus_configure_settings(child); | |
216 | ||
217 | return bus; | |
218 | } | |
219 | ||
220 | void pcibios_add_bus(struct pci_bus *bus) | |
221 | { | |
222 | acpi_pci_add_bus(bus); | |
a9cb97fe | 223 | } |
0cb0786b TN |
224 | |
225 | void pcibios_remove_bus(struct pci_bus *bus) | |
226 | { | |
227 | acpi_pci_remove_bus(bus); | |
228 | } | |
229 | ||
a9cb97fe | 230 | #endif |