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)
43 * pcibios_enable_device - Enable I/O and memory.
44 * @dev: PCI device to be enabled
45 * @mask: bitmask of BARs to enable
47 int pcibios_enable_device(struct pci_dev *dev, int mask)
49 if (pci_has_flag(PCI_PROBE_ONLY))
52 return pci_enable_resources(dev, mask);
56 * Try to assign the IRQ number when probing a new device
58 int pcibios_alloc_irq(struct pci_dev *dev)
61 dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
64 return acpi_pci_irq_enable(dev);
71 * raw_pci_read/write - Platform-specific PCI config space access.
73 int raw_pci_read(unsigned int domain, unsigned int bus,
74 unsigned int devfn, int reg, int len, u32 *val)
76 struct pci_bus *b = pci_find_bus(domain, bus);
79 return PCIBIOS_DEVICE_NOT_FOUND;
80 return b->ops->read(b, devfn, reg, len, val);
83 int raw_pci_write(unsigned int domain, unsigned int bus,
84 unsigned int devfn, int reg, int len, u32 val)
86 struct pci_bus *b = pci_find_bus(domain, bus);
89 return PCIBIOS_DEVICE_NOT_FOUND;
90 return b->ops->write(b, devfn, reg, len, val);
95 int pcibus_to_node(struct pci_bus *bus)
97 return dev_to_node(&bus->dev);
99 EXPORT_SYMBOL(pcibus_to_node);
105 struct acpi_pci_generic_root_info {
106 struct acpi_pci_root_info common;
107 struct pci_config_window *cfg; /* config space mapping */
110 int acpi_pci_bus_find_domain_nr(struct pci_bus *bus)
112 struct pci_config_window *cfg = bus->sysdata;
113 struct acpi_device *adev = to_acpi_device(cfg->parent);
114 struct acpi_pci_root *root = acpi_driver_data(adev);
116 return root->segment;
119 int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
121 if (!acpi_disabled) {
122 struct pci_config_window *cfg = bridge->bus->sysdata;
123 struct acpi_device *adev = to_acpi_device(cfg->parent);
124 ACPI_COMPANION_SET(&bridge->dev, adev);
131 * Lookup the bus range for the domain in MCFG, and set up config space
134 static struct pci_config_window *
135 pci_acpi_setup_ecam_mapping(struct acpi_pci_root *root)
137 struct resource *bus_res = &root->secondary;
138 u16 seg = root->segment;
139 struct pci_config_window *cfg;
140 struct resource cfgres;
143 /* Use address from _CBA if present, otherwise lookup MCFG */
144 if (!root->mcfg_addr)
145 root->mcfg_addr = pci_mcfg_lookup(seg, bus_res);
147 if (!root->mcfg_addr) {
148 dev_err(&root->device->dev, "%04x:%pR ECAM region not found\n",
153 bsz = 1 << pci_generic_ecam_ops.bus_shift;
154 cfgres.start = root->mcfg_addr + bus_res->start * bsz;
155 cfgres.end = cfgres.start + resource_size(bus_res) * bsz - 1;
156 cfgres.flags = IORESOURCE_MEM;
157 cfg = pci_ecam_create(&root->device->dev, &cfgres, bus_res,
158 &pci_generic_ecam_ops);
160 dev_err(&root->device->dev, "%04x:%pR error %ld mapping ECAM\n",
161 seg, bus_res, PTR_ERR(cfg));
168 /* release_info: free resources allocated by init_info */
169 static void pci_acpi_generic_release_info(struct acpi_pci_root_info *ci)
171 struct acpi_pci_generic_root_info *ri;
173 ri = container_of(ci, struct acpi_pci_generic_root_info, common);
174 pci_ecam_free(ri->cfg);
178 static struct acpi_pci_root_ops acpi_pci_root_ops = {
179 .release_info = pci_acpi_generic_release_info,
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;
189 ri = kzalloc_node(sizeof(*ri), GFP_KERNEL, node);
193 ri->cfg = pci_acpi_setup_ecam_mapping(root);
199 acpi_pci_root_ops.pci_ops = &ri->cfg->ops->pci_ops;
200 bus = acpi_pci_root_create(root, &acpi_pci_root_ops, &ri->common,
205 pci_bus_size_bridges(bus);
206 pci_bus_assign_resources(bus);
208 list_for_each_entry(child, &bus->children, node)
209 pcie_bus_configure_settings(child);
214 void pcibios_add_bus(struct pci_bus *bus)
216 acpi_pci_add_bus(bus);
219 void pcibios_remove_bus(struct pci_bus *bus)
221 acpi_pci_remove_bus(bus);