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 * Try to assign the IRQ number when probing a new device
45 int pcibios_alloc_irq(struct pci_dev
*dev
)
48 dev
->irq
= of_irq_parse_and_map_pci(dev
, 0, 0);
51 return acpi_pci_irq_enable(dev
);
58 * raw_pci_read/write - Platform-specific PCI config space access.
60 int raw_pci_read(unsigned int domain
, unsigned int bus
,
61 unsigned int devfn
, int reg
, int len
, u32
*val
)
63 struct pci_bus
*b
= pci_find_bus(domain
, bus
);
66 return PCIBIOS_DEVICE_NOT_FOUND
;
67 return b
->ops
->read(b
, devfn
, reg
, len
, val
);
70 int raw_pci_write(unsigned int domain
, unsigned int bus
,
71 unsigned int devfn
, int reg
, int len
, u32 val
)
73 struct pci_bus
*b
= pci_find_bus(domain
, bus
);
76 return PCIBIOS_DEVICE_NOT_FOUND
;
77 return b
->ops
->write(b
, devfn
, reg
, len
, val
);
82 int pcibus_to_node(struct pci_bus
*bus
)
84 return dev_to_node(&bus
->dev
);
86 EXPORT_SYMBOL(pcibus_to_node
);
92 struct acpi_pci_generic_root_info
{
93 struct acpi_pci_root_info common
;
94 struct pci_config_window
*cfg
; /* config space mapping */
97 int acpi_pci_bus_find_domain_nr(struct pci_bus
*bus
)
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
);
103 return root
->segment
;
106 int pcibios_root_bridge_prepare(struct pci_host_bridge
*bridge
)
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
);
117 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info
*ci
)
119 struct resource_entry
*entry
, *tmp
;
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
);
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 device
*dev
= &root
->device
->dev
;
138 struct resource
*bus_res
= &root
->secondary
;
139 u16 seg
= root
->segment
;
140 struct pci_ecam_ops
*ecam_ops
;
141 struct resource cfgres
;
142 struct acpi_device
*adev
;
143 struct pci_config_window
*cfg
;
146 ret
= pci_mcfg_lookup(root
, &cfgres
, &ecam_ops
);
148 dev_err(dev
, "%04x:%pR ECAM region not found\n", seg
, bus_res
);
152 adev
= acpi_resource_consumer(&cfgres
);
154 dev_info(dev
, "ECAM area %pR reserved by %s\n", &cfgres
,
155 dev_name(&adev
->dev
));
157 dev_warn(dev
, FW_BUG
"ECAM area %pR not reserved in ACPI namespace\n",
160 cfg
= pci_ecam_create(dev
, &cfgres
, bus_res
, ecam_ops
);
162 dev_err(dev
, "%04x:%pR error %ld mapping ECAM\n", seg
, bus_res
,
170 /* release_info: free resources allocated by init_info */
171 static void pci_acpi_generic_release_info(struct acpi_pci_root_info
*ci
)
173 struct acpi_pci_generic_root_info
*ri
;
175 ri
= container_of(ci
, struct acpi_pci_generic_root_info
, common
);
176 pci_ecam_free(ri
->cfg
);
181 /* Interface called from ACPI code to setup PCI host controller */
182 struct pci_bus
*pci_acpi_scan_root(struct acpi_pci_root
*root
)
184 int node
= acpi_get_node(root
->device
->handle
);
185 struct acpi_pci_generic_root_info
*ri
;
186 struct pci_bus
*bus
, *child
;
187 struct acpi_pci_root_ops
*root_ops
;
189 ri
= kzalloc_node(sizeof(*ri
), GFP_KERNEL
, node
);
193 root_ops
= kzalloc_node(sizeof(*root_ops
), GFP_KERNEL
, node
);
197 ri
->cfg
= pci_acpi_setup_ecam_mapping(root
);
204 root_ops
->release_info
= pci_acpi_generic_release_info
;
205 root_ops
->prepare_resources
= pci_acpi_root_prepare_resources
;
206 root_ops
->pci_ops
= &ri
->cfg
->ops
->pci_ops
;
207 bus
= acpi_pci_root_create(root
, root_ops
, &ri
->common
, ri
->cfg
);
211 pci_bus_size_bridges(bus
);
212 pci_bus_assign_resources(bus
);
214 list_for_each_entry(child
, &bus
->children
, node
)
215 pcie_bus_configure_settings(child
);
220 void pcibios_add_bus(struct pci_bus
*bus
)
222 acpi_pci_add_bus(bus
);
225 void pcibios_remove_bus(struct pci_bus
*bus
)
227 acpi_pci_remove_bus(bus
);