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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d1e6dc91 LD |
2 | /* |
3 | * Code borrowed from powerpc/kernel/pci-common.c | |
4 | * | |
5 | * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM | |
6 | * Copyright (C) 2014 ARM Ltd. | |
d1e6dc91 LD |
7 | */ |
8 | ||
a9cb97fe | 9 | #include <linux/acpi.h> |
d1e6dc91 LD |
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> | |
2ab51dde | 16 | #include <linux/pci.h> |
0cb0786b TN |
17 | #include <linux/pci-acpi.h> |
18 | #include <linux/pci-ecam.h> | |
d1e6dc91 LD |
19 | #include <linux/slab.h> |
20 | ||
769b461f | 21 | #ifdef CONFIG_ACPI |
d1e6dc91 | 22 | /* |
d8ed75d5 | 23 | * Try to assign the IRQ number when probing a new device |
d1e6dc91 | 24 | */ |
d8ed75d5 | 25 | int pcibios_alloc_irq(struct pci_dev *dev) |
d1e6dc91 | 26 | { |
769b461f LP |
27 | if (!acpi_disabled) |
28 | acpi_pci_irq_enable(dev); | |
d1e6dc91 LD |
29 | |
30 | return 0; | |
31 | } | |
769b461f | 32 | #endif |
a9cb97fe HG |
33 | |
34 | /* | |
35 | * raw_pci_read/write - Platform-specific PCI config space access. | |
36 | */ | |
37 | int raw_pci_read(unsigned int domain, unsigned int bus, | |
38 | unsigned int devfn, int reg, int len, u32 *val) | |
39 | { | |
f058f4fb TN |
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); | |
a9cb97fe HG |
45 | } |
46 | ||
47 | int raw_pci_write(unsigned int domain, unsigned int bus, | |
48 | unsigned int devfn, int reg, int len, u32 val) | |
49 | { | |
f058f4fb TN |
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); | |
a9cb97fe HG |
55 | } |
56 | ||
1a2db300 GK |
57 | #ifdef CONFIG_NUMA |
58 | ||
59 | int pcibus_to_node(struct pci_bus *bus) | |
60 | { | |
61 | return dev_to_node(&bus->dev); | |
62 | } | |
63 | EXPORT_SYMBOL(pcibus_to_node); | |
64 | ||
65 | #endif | |
66 | ||
a9cb97fe | 67 | #ifdef CONFIG_ACPI |
2ab51dde | 68 | |
0cb0786b TN |
69 | struct acpi_pci_generic_root_info { |
70 | struct acpi_pci_root_info common; | |
71 | struct pci_config_window *cfg; /* config space mapping */ | |
72 | }; | |
73 | ||
2ab51dde TN |
74 | int acpi_pci_bus_find_domain_nr(struct pci_bus *bus) |
75 | { | |
0cb0786b TN |
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 | ||
83 | int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) | |
84 | { | |
85 | if (!acpi_disabled) { | |
86 | struct pci_config_window *cfg = bridge->bus->sysdata; | |
87 | struct acpi_device *adev = to_acpi_device(cfg->parent); | |
db46a72b LP |
88 | struct device *bus_dev = &bridge->bus->dev; |
89 | ||
0cb0786b | 90 | ACPI_COMPANION_SET(&bridge->dev, adev); |
db46a72b | 91 | set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev))); |
0cb0786b TN |
92 | } |
93 | ||
2ab51dde TN |
94 | return 0; |
95 | } | |
96 | ||
8fd4391e BH |
97 | static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci) |
98 | { | |
99 | struct resource_entry *entry, *tmp; | |
100 | int status; | |
101 | ||
102 | status = acpi_pci_probe_root_resources(ci); | |
103 | resource_list_for_each_entry_safe(entry, tmp, &ci->resources) { | |
104 | if (!(entry->res->flags & IORESOURCE_WINDOW)) | |
105 | resource_list_destroy_entry(entry); | |
106 | } | |
107 | return status; | |
108 | } | |
109 | ||
0cb0786b TN |
110 | /* |
111 | * Lookup the bus range for the domain in MCFG, and set up config space | |
112 | * mapping. | |
113 | */ | |
114 | static struct pci_config_window * | |
115 | pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root) | |
116 | { | |
dfd1972c | 117 | struct device *dev = &root->device->dev; |
0cb0786b TN |
118 | struct resource *bus_res = &root->secondary; |
119 | u16 seg = root->segment; | |
13983eb8 | 120 | struct pci_ecam_ops *ecam_ops; |
0cb0786b | 121 | struct resource cfgres; |
08b1c196 BH |
122 | struct acpi_device *adev; |
123 | struct pci_config_window *cfg; | |
13983eb8 | 124 | int ret; |
0cb0786b | 125 | |
13983eb8 TN |
126 | ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops); |
127 | if (ret) { | |
dfd1972c | 128 | dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res); |
0cb0786b TN |
129 | return NULL; |
130 | } | |
131 | ||
08b1c196 BH |
132 | adev = acpi_resource_consumer(&cfgres); |
133 | if (adev) | |
134 | dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres, | |
135 | dev_name(&adev->dev)); | |
136 | else | |
137 | dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n", | |
138 | &cfgres); | |
139 | ||
13983eb8 | 140 | cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops); |
0cb0786b | 141 | if (IS_ERR(cfg)) { |
dfd1972c BH |
142 | dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res, |
143 | PTR_ERR(cfg)); | |
0cb0786b TN |
144 | return NULL; |
145 | } | |
146 | ||
147 | return cfg; | |
148 | } | |
149 | ||
150 | /* release_info: free resources allocated by init_info */ | |
151 | static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci) | |
152 | { | |
153 | struct acpi_pci_generic_root_info *ri; | |
154 | ||
155 | ri = container_of(ci, struct acpi_pci_generic_root_info, common); | |
156 | pci_ecam_free(ri->cfg); | |
093d24a2 | 157 | kfree(ci->ops); |
0cb0786b TN |
158 | kfree(ri); |
159 | } | |
160 | ||
0cb0786b | 161 | /* Interface called from ACPI code to setup PCI host controller */ |
a9cb97fe HG |
162 | struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) |
163 | { | |
0cb0786b TN |
164 | struct acpi_pci_generic_root_info *ri; |
165 | struct pci_bus *bus, *child; | |
093d24a2 | 166 | struct acpi_pci_root_ops *root_ops; |
85dc0413 | 167 | struct pci_host_bridge *host; |
0cb0786b | 168 | |
9c314a48 | 169 | ri = kzalloc(sizeof(*ri), GFP_KERNEL); |
0cb0786b TN |
170 | if (!ri) |
171 | return NULL; | |
172 | ||
9c314a48 | 173 | root_ops = kzalloc(sizeof(*root_ops), GFP_KERNEL); |
717902cc TL |
174 | if (!root_ops) { |
175 | kfree(ri); | |
093d24a2 | 176 | return NULL; |
717902cc | 177 | } |
093d24a2 | 178 | |
0cb0786b TN |
179 | ri->cfg = pci_acpi_setup_ecam_mapping(root); |
180 | if (!ri->cfg) { | |
181 | kfree(ri); | |
093d24a2 | 182 | kfree(root_ops); |
0cb0786b TN |
183 | return NULL; |
184 | } | |
185 | ||
093d24a2 | 186 | root_ops->release_info = pci_acpi_generic_release_info; |
8fd4391e | 187 | root_ops->prepare_resources = pci_acpi_root_prepare_resources; |
093d24a2 TN |
188 | root_ops->pci_ops = &ri->cfg->ops->pci_ops; |
189 | bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg); | |
0cb0786b TN |
190 | if (!bus) |
191 | return NULL; | |
192 | ||
85dc0413 BH |
193 | /* If we must preserve the resource configuration, claim now */ |
194 | host = pci_find_host_bridge(bus); | |
195 | if (host->preserve_config) | |
196 | pci_bus_claim_resources(bus); | |
197 | ||
198 | /* | |
199 | * Assign whatever was left unassigned. If we didn't claim above, | |
200 | * this will reassign everything. | |
201 | */ | |
3e8ba968 | 202 | pci_assign_unassigned_root_bus_resources(bus); |
0cb0786b TN |
203 | |
204 | list_for_each_entry(child, &bus->children, node) | |
205 | pcie_bus_configure_settings(child); | |
206 | ||
207 | return bus; | |
208 | } | |
209 | ||
210 | void pcibios_add_bus(struct pci_bus *bus) | |
211 | { | |
212 | acpi_pci_add_bus(bus); | |
a9cb97fe | 213 | } |
0cb0786b TN |
214 | |
215 | void pcibios_remove_bus(struct pci_bus *bus) | |
216 | { | |
217 | acpi_pci_remove_bus(bus); | |
218 | } | |
219 | ||
a9cb97fe | 220 | #endif |