2 * Code borrowed from powerpc/kernel/pci-common.c
4 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
5 * Copyright (C) 2014 ARM Ltd.
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.
13 #include <linux/acpi.h>
14 #include <linux/init.h>
16 #include <linux/kernel.h>
18 #include <linux/of_pci.h>
19 #include <linux/of_platform.h>
20 #include <linux/pci.h>
21 #include <linux/pci-acpi.h>
22 #include <linux/pci-ecam.h>
23 #include <linux/slab.h>
26 * Called after each bus is probed, but before its children are examined
28 void pcibios_fixup_bus(struct pci_bus *bus)
30 /* nothing to do, expected to be removed in the future */
34 * We don't have to worry about legacy ISA devices, so nothing to do here
36 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
37 resource_size_t size, resource_size_t align)
44 * Try to assign the IRQ number when probing a new device
46 int pcibios_alloc_irq(struct pci_dev *dev)
49 acpi_pci_irq_enable(dev);
56 * raw_pci_read/write - Platform-specific PCI config space access.
58 int raw_pci_read(unsigned int domain, unsigned int bus,
59 unsigned int devfn, int reg, int len, u32 *val)
61 struct pci_bus *b = pci_find_bus(domain, bus);
64 return PCIBIOS_DEVICE_NOT_FOUND;
65 return b->ops->read(b, devfn, reg, len, val);
68 int raw_pci_write(unsigned int domain, unsigned int bus,
69 unsigned int devfn, int reg, int len, u32 val)
71 struct pci_bus *b = pci_find_bus(domain, bus);
74 return PCIBIOS_DEVICE_NOT_FOUND;
75 return b->ops->write(b, devfn, reg, len, val);
80 int pcibus_to_node(struct pci_bus *bus)
82 return dev_to_node(&bus->dev);
84 EXPORT_SYMBOL(pcibus_to_node);
90 struct acpi_pci_generic_root_info {
91 struct acpi_pci_root_info common;
92 struct pci_config_window *cfg; /* config space mapping */
95 int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
97 struct pci_config_window *cfg = bus->sysdata;
98 struct acpi_device *adev = to_acpi_device(cfg->parent);
99 struct acpi_pci_root *root = acpi_driver_data(adev);
101 return root->segment;
104 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
106 if (!acpi_disabled) {
107 struct pci_config_window *cfg = bridge->bus->sysdata;
108 struct acpi_device *adev = to_acpi_device(cfg->parent);
109 struct device *bus_dev = &bridge->bus->dev;
111 ACPI_COMPANION_SET(&bridge->dev, adev);
112 set_dev_node(bus_dev, acpi_get_node(acpi_device_handle(adev)));
118 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
120 struct resource_entry *entry, *tmp;
123 status = acpi_pci_probe_root_resources(ci);
124 resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
125 if (!(entry->res->flags & IORESOURCE_WINDOW))
126 resource_list_destroy_entry(entry);
132 * Lookup the bus range for the domain in MCFG, and set up config space
135 static struct pci_config_window *
136 pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
138 struct device *dev = &root->device->dev;
139 struct resource *bus_res = &root->secondary;
140 u16 seg = root->segment;
141 struct pci_ecam_ops *ecam_ops;
142 struct resource cfgres;
143 struct acpi_device *adev;
144 struct pci_config_window *cfg;
147 ret = pci_mcfg_lookup(root, &cfgres, &ecam_ops);
149 dev_err(dev, "%04x:%pR ECAM region not found\n", seg, bus_res);
153 adev = acpi_resource_consumer(&cfgres);
155 dev_info(dev, "ECAM area %pR reserved by %s\n", &cfgres,
156 dev_name(&adev->dev));
158 dev_warn(dev, FW_BUG "ECAM area %pR not reserved in ACPI namespace\n",
161 cfg = pci_ecam_create(dev, &cfgres, bus_res, ecam_ops);
163 dev_err(dev, "%04x:%pR error %ld mapping ECAM\n", seg, bus_res,
171 /* release_info: free resources allocated by init_info */
172 static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
174 struct acpi_pci_generic_root_info *ri;
176 ri = container_of(ci, struct acpi_pci_generic_root_info, common);
177 pci_ecam_free(ri->cfg);
182 /* Interface called from ACPI code to setup PCI host controller */
183 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
185 int node = acpi_get_node(root->device->handle);
186 struct acpi_pci_generic_root_info *ri;
187 struct pci_bus *bus, *child;
188 struct acpi_pci_root_ops *root_ops;
190 ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node);
194 root_ops = kzalloc_node(sizeof(*root_ops), GFP_KERNEL, node);
200 ri->cfg = pci_acpi_setup_ecam_mapping(root);
207 root_ops->release_info = pci_acpi_generic_release_info;
208 root_ops->prepare_resources = pci_acpi_root_prepare_resources;
209 root_ops->pci_ops = &ri->cfg->ops->pci_ops;
210 bus = acpi_pci_root_create(root, root_ops, &ri->common, ri->cfg);
214 pci_bus_size_bridges(bus);
215 pci_bus_assign_resources(bus);
217 list_for_each_entry(child, &bus->children, node)
218 pcie_bus_configure_settings(child);
223 void pcibios_add_bus(struct pci_bus *bus)
225 acpi_pci_add_bus(bus);
228 void pcibios_remove_bus(struct pci_bus *bus)
230 acpi_pci_remove_bus(bus);