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
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