2 * Generic PCI host driver common code
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
16 * Copyright (C) 2014 ARM Limited
18 * Author: Will Deacon <will.deacon@arm.com>
21 #include <linux/kernel.h>
22 #include <linux/of_address.h>
23 #include <linux/of_pci.h>
24 #include <linux/pci-ecam.h>
25 #include <linux/platform_device.h>
27 static int gen_pci_parse_request_of_pci_ranges(struct device
*dev
,
28 struct list_head
*resources
, struct resource
**bus_range
)
30 int err
, res_valid
= 0;
31 struct device_node
*np
= dev
->of_node
;
32 resource_size_t iobase
;
33 struct resource_entry
*win
;
35 err
= of_pci_get_host_bridge_resources(np
, 0, 0xff, resources
, &iobase
);
39 err
= devm_request_pci_bus_resources(dev
, resources
);
43 resource_list_for_each_entry(win
, resources
) {
44 struct resource
*res
= win
->res
;
46 switch (resource_type(res
)) {
48 err
= pci_remap_iospace(res
, iobase
);
50 dev_warn(dev
, "error %d: failed to map resource %pR\n",
54 res_valid
|= !(res
->flags
& IORESOURCE_PREFETCH
);
65 dev_err(dev
, "non-prefetchable memory resource required\n");
69 static void gen_pci_unmap_cfg(void *ptr
)
71 pci_ecam_free((struct pci_config_window
*)ptr
);
74 static struct pci_config_window
*gen_pci_init(struct device
*dev
,
75 struct list_head
*resources
, struct pci_ecam_ops
*ops
)
78 struct resource cfgres
;
79 struct resource
*bus_range
= NULL
;
80 struct pci_config_window
*cfg
;
82 /* Parse our PCI ranges and request their resources */
83 err
= gen_pci_parse_request_of_pci_ranges(dev
, resources
, &bus_range
);
87 err
= of_address_to_resource(dev
->of_node
, 0, &cfgres
);
89 dev_err(dev
, "missing \"reg\" property\n");
93 cfg
= pci_ecam_create(dev
, &cfgres
, bus_range
, ops
);
99 err
= devm_add_action(dev
, gen_pci_unmap_cfg
, cfg
);
101 gen_pci_unmap_cfg(cfg
);
107 pci_free_resource_list(resources
);
111 int pci_host_common_probe(struct platform_device
*pdev
,
112 struct pci_ecam_ops
*ops
)
115 struct device
*dev
= &pdev
->dev
;
116 struct device_node
*np
= dev
->of_node
;
117 struct pci_bus
*bus
, *child
;
118 struct pci_config_window
*cfg
;
119 struct list_head resources
;
121 type
= of_get_property(np
, "device_type", NULL
);
122 if (!type
|| strcmp(type
, "pci")) {
123 dev_err(dev
, "invalid \"device_type\" %s\n", type
);
127 of_pci_check_probe_only();
129 /* Parse and map our Configuration Space windows */
130 INIT_LIST_HEAD(&resources
);
131 cfg
= gen_pci_init(dev
, &resources
, ops
);
135 /* Do not reassign resources if probe only */
136 if (!pci_has_flag(PCI_PROBE_ONLY
))
137 pci_add_flags(PCI_REASSIGN_ALL_RSRC
| PCI_REASSIGN_ALL_BUS
);
139 bus
= pci_scan_root_bus(dev
, cfg
->busr
.start
, &ops
->pci_ops
, cfg
,
142 dev_err(dev
, "Scanning rootbus failed");
146 pci_fixup_irqs(pci_common_swizzle
, of_irq_parse_and_map_pci
);
149 * We insert PCI resources into the iomem_resource and
150 * ioport_resource trees in either pci_bus_claim_resources()
151 * or pci_bus_assign_resources().
153 if (pci_has_flag(PCI_PROBE_ONLY
)) {
154 pci_bus_claim_resources(bus
);
156 pci_bus_size_bridges(bus
);
157 pci_bus_assign_resources(bus
);
159 list_for_each_entry(child
, &bus
->children
, node
)
160 pcie_bus_configure_settings(child
);
163 pci_bus_add_devices(bus
);
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