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 | ||
0cb0786b TN |
117 | /* |
118 | * Lookup the bus range for the domain in MCFG, and set up config space | |
119 | * mapping. | |
120 | */ | |
121 | static struct pci_config_window * | |
122 | pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root) | |
123 | { | |
124 | struct resource *bus_res = &root->secondary; | |
125 | u16 seg = root->segment; | |
126 | struct pci_config_window *cfg; | |
127 | struct resource cfgres; | |
128 | unsigned int bsz; | |
129 | ||
130 | /* Use address from _CBA if present, otherwise lookup MCFG */ | |
131 | if (!root->mcfg_addr) | |
132 | root->mcfg_addr = pci_mcfg_lookup(seg, bus_res); | |
133 | ||
134 | if (!root->mcfg_addr) { | |
135 | dev_err(&root->device->dev, "%04x:%pR ECAM region not found\n", | |
136 | seg, bus_res); | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | bsz = 1 << pci_generic_ecam_ops.bus_shift; | |
141 | cfgres.start = root->mcfg_addr + bus_res->start * bsz; | |
142 | cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1; | |
143 | cfgres.flags = IORESOURCE_MEM; | |
144 | cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res, | |
145 | &pci_generic_ecam_ops); | |
146 | if (IS_ERR(cfg)) { | |
147 | dev_err(&root->device->dev, "%04x:%pR error %ld mapping ECAM\n", | |
148 | seg, bus_res, PTR_ERR(cfg)); | |
149 | return NULL; | |
150 | } | |
151 | ||
152 | return cfg; | |
153 | } | |
154 | ||
155 | /* release_info: free resources allocated by init_info */ | |
156 | static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci) | |
157 | { | |
158 | struct acpi_pci_generic_root_info *ri; | |
159 | ||
160 | ri = container_of(ci, struct acpi_pci_generic_root_info, common); | |
161 | pci_ecam_free(ri->cfg); | |
162 | kfree(ri); | |
163 | } | |
164 | ||
165 | static struct acpi_pci_root_ops acpi_pci_root_ops = { | |
166 | .release_info = pci_acpi_generic_release_info, | |
167 | }; | |
168 | ||
169 | /* Interface called from ACPI code to setup PCI host controller */ | |
a9cb97fe HG |
170 | struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root) |
171 | { | |
0cb0786b TN |
172 | int node = acpi_get_node(root->device->handle); |
173 | struct acpi_pci_generic_root_info *ri; | |
174 | struct pci_bus *bus, *child; | |
175 | ||
176 | ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node); | |
177 | if (!ri) | |
178 | return NULL; | |
179 | ||
180 | ri->cfg = pci_acpi_setup_ecam_mapping(root); | |
181 | if (!ri->cfg) { | |
182 | kfree(ri); | |
183 | return NULL; | |
184 | } | |
185 | ||
186 | acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops; | |
187 | bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common, | |
188 | ri->cfg); | |
189 | if (!bus) | |
190 | return NULL; | |
191 | ||
192 | pci_bus_size_bridges(bus); | |
193 | pci_bus_assign_resources(bus); | |
194 | ||
195 | list_for_each_entry(child, &bus->children, node) | |
196 | pcie_bus_configure_settings(child); | |
197 | ||
198 | return bus; | |
199 | } | |
200 | ||
201 | void pcibios_add_bus(struct pci_bus *bus) | |
202 | { | |
203 | acpi_pci_add_bus(bus); | |
a9cb97fe | 204 | } |
0cb0786b TN |
205 | |
206 | void pcibios_remove_bus(struct pci_bus *bus) | |
207 | { | |
208 | acpi_pci_remove_bus(bus); | |
209 | } | |
210 | ||
a9cb97fe | 211 | #endif |