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
);
118 * Lookup the bus range for the domain in MCFG, and set up config space
121 static struct pci_config_window
*
122 pci_acpi_setup_ecam_mapping(struct acpi_pci_root
*root
)
124 struct resource
*bus_res
= &root
->secondary
;
125 u16 seg
= root
->segment
;
126 struct pci_config_window
*cfg
;
127 struct resource cfgres
;
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
);
134 if (!root
->mcfg_addr
) {
135 dev_err(&root
->device
->dev
, "%04x:%pR ECAM region not found\n",
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
);
147 dev_err(&root
->device
->dev
, "%04x:%pR error %ld mapping ECAM\n",
148 seg
, bus_res
, PTR_ERR(cfg
));
155 /* release_info: free resources allocated by init_info */
156 static void pci_acpi_generic_release_info(struct acpi_pci_root_info
*ci
)
158 struct acpi_pci_generic_root_info
*ri
;
160 ri
= container_of(ci
, struct acpi_pci_generic_root_info
, common
);
161 pci_ecam_free(ri
->cfg
);
165 static struct acpi_pci_root_ops acpi_pci_root_ops
= {
166 .release_info
= pci_acpi_generic_release_info
,
169 /* Interface called from ACPI code to setup PCI host controller */
170 struct pci_bus
*pci_acpi_scan_root(struct acpi_pci_root
*root
)
172 int node
= acpi_get_node(root
->device
->handle
);
173 struct acpi_pci_generic_root_info
*ri
;
174 struct pci_bus
*bus
, *child
;
176 ri
= kzalloc_node(sizeof(*ri
), GFP_KERNEL
, node
);
180 ri
->cfg
= pci_acpi_setup_ecam_mapping(root
);
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
,
192 pci_bus_size_bridges(bus
);
193 pci_bus_assign_resources(bus
);
195 list_for_each_entry(child
, &bus
->children
, node
)
196 pcie_bus_configure_settings(child
);
201 void pcibios_add_bus(struct pci_bus
*bus
)
203 acpi_pci_add_bus(bus
);
206 void pcibios_remove_bus(struct pci_bus
*bus
)
208 acpi_pci_remove_bus(bus
);