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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - drivers/pci/host/pci-host-common.c
1 // SPDX-License-Identifier: GPL-2.0
3 * Generic PCI host driver common code
5 * Copyright (C) 2014 ARM Limited
7 * Author: Will Deacon <will.deacon@arm.com>
10 #include <linux/kernel.h>
11 #include <linux/of_address.h>
12 #include <linux/of_pci.h>
13 #include <linux/pci-ecam.h>
14 #include <linux/platform_device.h>
16 static void gen_pci_unmap_cfg(void *ptr
)
18 pci_ecam_free((struct pci_config_window
*)ptr
);
21 static struct pci_config_window
*gen_pci_init(struct device
*dev
,
22 struct list_head
*resources
, struct pci_ecam_ops
*ops
)
25 struct resource cfgres
;
26 struct resource
*bus_range
= NULL
;
27 struct pci_config_window
*cfg
;
29 /* Parse our PCI ranges and request their resources */
30 err
= pci_parse_request_of_pci_ranges(dev
, resources
, &bus_range
);
34 err
= of_address_to_resource(dev
->of_node
, 0, &cfgres
);
36 dev_err(dev
, "missing \"reg\" property\n");
40 cfg
= pci_ecam_create(dev
, &cfgres
, bus_range
, ops
);
46 err
= devm_add_action(dev
, gen_pci_unmap_cfg
, cfg
);
48 gen_pci_unmap_cfg(cfg
);
54 pci_free_resource_list(resources
);
58 int pci_host_common_probe(struct platform_device
*pdev
,
59 struct pci_ecam_ops
*ops
)
62 struct device
*dev
= &pdev
->dev
;
63 struct device_node
*np
= dev
->of_node
;
64 struct pci_host_bridge
*bridge
;
65 struct pci_config_window
*cfg
;
66 struct list_head resources
;
69 bridge
= devm_pci_alloc_host_bridge(dev
, 0);
73 type
= of_get_property(np
, "device_type", NULL
);
74 if (!type
|| strcmp(type
, "pci")) {
75 dev_err(dev
, "invalid \"device_type\" %s\n", type
);
79 of_pci_check_probe_only();
81 /* Parse and map our Configuration Space windows */
82 cfg
= gen_pci_init(dev
, &resources
, ops
);
86 /* Do not reassign resources if probe only */
87 if (!pci_has_flag(PCI_PROBE_ONLY
))
88 pci_add_flags(PCI_REASSIGN_ALL_BUS
);
90 list_splice_init(&resources
, &bridge
->windows
);
91 bridge
->dev
.parent
= dev
;
92 bridge
->sysdata
= cfg
;
93 bridge
->busnr
= cfg
->busr
.start
;
94 bridge
->ops
= &ops
->pci_ops
;
95 bridge
->map_irq
= of_irq_parse_and_map_pci
;
96 bridge
->swizzle_irq
= pci_common_swizzle
;
98 ret
= pci_host_probe(bridge
);
100 pci_free_resource_list(&resources
);
104 platform_set_drvdata(pdev
, bridge
->bus
);
108 int pci_host_common_remove(struct platform_device
*pdev
)
110 struct pci_bus
*bus
= platform_get_drvdata(pdev
);
112 pci_lock_rescan_remove();
113 pci_stop_root_bus(bus
);
114 pci_remove_root_bus(bus
);
115 pci_unlock_rescan_remove();