1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. |
4 | * <benh@kernel.crashing.org> |
5 | * and Arnd Bergmann, IBM Corp. |
6 | */ |
7 | |
8 | #undef DEBUG |
9 | |
10 | #include <linux/string.h> |
11 | #include <linux/kernel.h> |
12 | #include <linux/init.h> |
13 | #include <linux/export.h> |
14 | #include <linux/mod_devicetable.h> |
15 | #include <linux/pci.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/atomic.h> |
18 | |
19 | #include <asm/errno.h> |
20 | #include <asm/topology.h> |
21 | #include <asm/pci-bridge.h> |
22 | #include <asm/ppc-pci.h> |
23 | #include <asm/eeh.h> |
24 | |
25 | #ifdef CONFIG_PPC_OF_PLATFORM_PCI |
26 | |
27 | /* The probing of PCI controllers from of_platform is currently |
28 | * 64 bits only, mostly due to gratuitous differences between |
29 | * the 32 and 64 bits PCI code on PowerPC and the 32 bits one |
30 | * lacking some bits needed here. |
31 | */ |
32 | |
33 | static int of_pci_phb_probe(struct platform_device *dev) |
34 | { |
35 | struct pci_controller *phb; |
36 | |
37 | /* Check if we can do that ... */ |
38 | if (ppc_md.pci_setup_phb == NULL) |
39 | return -ENODEV; |
40 | |
41 | pr_info("Setting up PCI bus %pOF\n" , dev->dev.of_node); |
42 | |
43 | /* Alloc and setup PHB data structure */ |
44 | phb = pcibios_alloc_controller(dev->dev.of_node); |
45 | if (!phb) |
46 | return -ENODEV; |
47 | |
48 | /* Setup parent in sysfs */ |
49 | phb->parent = &dev->dev; |
50 | |
51 | /* Setup the PHB using arch provided callback */ |
52 | if (ppc_md.pci_setup_phb(phb)) { |
53 | pcibios_free_controller(phb); |
54 | return -ENODEV; |
55 | } |
56 | |
57 | /* Process "ranges" property */ |
58 | pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0); |
59 | |
60 | /* Init pci_dn data structures */ |
61 | pci_devs_phb_init_dynamic(phb); |
62 | |
63 | /* Create EEH PE for the PHB */ |
64 | eeh_phb_pe_create(phb); |
65 | |
66 | /* Scan the bus */ |
67 | pcibios_scan_phb(phb); |
68 | if (phb->bus == NULL) |
69 | return -ENXIO; |
70 | |
71 | /* Claim resources. This might need some rework as well depending |
72 | * whether we are doing probe-only or not, like assigning unassigned |
73 | * resources etc... |
74 | */ |
75 | pcibios_claim_one_bus(phb->bus); |
76 | |
77 | /* Add probed PCI devices to the device model */ |
78 | pci_bus_add_devices(phb->bus); |
79 | |
80 | return 0; |
81 | } |
82 | |
83 | static const struct of_device_id of_pci_phb_ids[] = { |
84 | { .type = "pci" , }, |
85 | { .type = "pcix" , }, |
86 | { .type = "pcie" , }, |
87 | { .type = "pciex" , }, |
88 | { .type = "ht" , }, |
89 | {} |
90 | }; |
91 | |
92 | static struct platform_driver of_pci_phb_driver = { |
93 | .probe = of_pci_phb_probe, |
94 | .driver = { |
95 | .name = "of-pci" , |
96 | .of_match_table = of_pci_phb_ids, |
97 | }, |
98 | }; |
99 | |
100 | builtin_platform_driver(of_pci_phb_driver); |
101 | |
102 | #endif /* CONFIG_PPC_OF_PLATFORM_PCI */ |
103 | |