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/of.h>
17 #include <linux/of_device.h>
18 #include <linux/of_platform.h>
19 #include <linux/atomic.h>
20
21 #include <asm/errno.h>
22 #include <asm/topology.h>
23 #include <asm/pci-bridge.h>
24 #include <asm/ppc-pci.h>
25 #include <asm/eeh.h>
26
27 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
28
29 /* The probing of PCI controllers from of_platform is currently
30 * 64 bits only, mostly due to gratuitous differences between
31 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
32 * lacking some bits needed here.
33 */
34
of_pci_phb_probe(struct platform_device * dev)35 static int of_pci_phb_probe(struct platform_device *dev)
36 {
37 struct pci_controller *phb;
38
39 /* Check if we can do that ... */
40 if (ppc_md.pci_setup_phb == NULL)
41 return -ENODEV;
42
43 pr_info("Setting up PCI bus %pOF\n", dev->dev.of_node);
44
45 /* Alloc and setup PHB data structure */
46 phb = pcibios_alloc_controller(dev->dev.of_node);
47 if (!phb)
48 return -ENODEV;
49
50 /* Setup parent in sysfs */
51 phb->parent = &dev->dev;
52
53 /* Setup the PHB using arch provided callback */
54 if (ppc_md.pci_setup_phb(phb)) {
55 pcibios_free_controller(phb);
56 return -ENODEV;
57 }
58
59 /* Process "ranges" property */
60 pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
61
62 /* Init pci_dn data structures */
63 pci_devs_phb_init_dynamic(phb);
64
65 /* Create EEH PE for the PHB */
66 eeh_phb_pe_create(phb);
67
68 /* Scan the bus */
69 pcibios_scan_phb(phb);
70 if (phb->bus == NULL)
71 return -ENXIO;
72
73 /* Claim resources. This might need some rework as well depending
74 * whether we are doing probe-only or not, like assigning unassigned
75 * resources etc...
76 */
77 pcibios_claim_one_bus(phb->bus);
78
79 /* Add probed PCI devices to the device model */
80 pci_bus_add_devices(phb->bus);
81
82 return 0;
83 }
84
85 static const struct of_device_id of_pci_phb_ids[] = {
86 { .type = "pci", },
87 { .type = "pcix", },
88 { .type = "pcie", },
89 { .type = "pciex", },
90 { .type = "ht", },
91 {}
92 };
93
94 static struct platform_driver of_pci_phb_driver = {
95 .probe = of_pci_phb_probe,
96 .driver = {
97 .name = "of-pci",
98 .of_match_table = of_pci_phb_ids,
99 },
100 };
101
102 builtin_platform_driver(of_pci_phb_driver);
103
104 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */
105