1 /*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, IBM Corp.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #undef DEBUG
14
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/export.h>
19 #include <linux/mod_devicetable.h>
20 #include <linux/pci.h>
21 #include <linux/of.h>
22 #include <linux/of_device.h>
23 #include <linux/of_platform.h>
24 #include <linux/atomic.h>
25
26 #include <asm/errno.h>
27 #include <asm/topology.h>
28 #include <asm/pci-bridge.h>
29 #include <asm/ppc-pci.h>
30 #include <asm/eeh.h>
31
32 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
33
34 /* The probing of PCI controllers from of_platform is currently
35 * 64 bits only, mostly due to gratuitous differences between
36 * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
37 * lacking some bits needed here.
38 */
39
of_pci_phb_probe(struct platform_device * dev)40 static int __devinit of_pci_phb_probe(struct platform_device *dev)
41 {
42 struct pci_controller *phb;
43
44 /* Check if we can do that ... */
45 if (ppc_md.pci_setup_phb == NULL)
46 return -ENODEV;
47
48 pr_info("Setting up PCI bus %s\n", dev->dev.of_node->full_name);
49
50 /* Alloc and setup PHB data structure */
51 phb = pcibios_alloc_controller(dev->dev.of_node);
52 if (!phb)
53 return -ENODEV;
54
55 /* Setup parent in sysfs */
56 phb->parent = &dev->dev;
57
58 /* Setup the PHB using arch provided callback */
59 if (ppc_md.pci_setup_phb(phb)) {
60 pcibios_free_controller(phb);
61 return -ENODEV;
62 }
63
64 /* Process "ranges" property */
65 pci_process_bridge_OF_ranges(phb, dev->dev.of_node, 0);
66
67 /* Init pci_dn data structures */
68 pci_devs_phb_init_dynamic(phb);
69
70 /* Create EEH devices for the PHB */
71 eeh_dev_phb_init_dynamic(phb);
72
73 /* Register devices with EEH */
74 #ifdef CONFIG_EEH
75 if (dev->dev.of_node->child)
76 eeh_add_device_tree_early(dev->dev.of_node);
77 #endif /* CONFIG_EEH */
78
79 /* Scan the bus */
80 pcibios_scan_phb(phb);
81 if (phb->bus == NULL)
82 return -ENXIO;
83
84 /* Claim resources. This might need some rework as well depending
85 * wether we are doing probe-only or not, like assigning unassigned
86 * resources etc...
87 */
88 pcibios_claim_one_bus(phb->bus);
89
90 /* Finish EEH setup */
91 #ifdef CONFIG_EEH
92 eeh_add_device_tree_late(phb->bus);
93 #endif
94
95 /* Add probed PCI devices to the device model */
96 pci_bus_add_devices(phb->bus);
97
98 return 0;
99 }
100
101 static struct of_device_id of_pci_phb_ids[] = {
102 { .type = "pci", },
103 { .type = "pcix", },
104 { .type = "pcie", },
105 { .type = "pciex", },
106 { .type = "ht", },
107 {}
108 };
109
110 static struct platform_driver of_pci_phb_driver = {
111 .probe = of_pci_phb_probe,
112 .driver = {
113 .name = "of-pci",
114 .owner = THIS_MODULE,
115 .of_match_table = of_pci_phb_ids,
116 },
117 };
118
of_pci_phb_init(void)119 static __init int of_pci_phb_init(void)
120 {
121 return platform_driver_register(&of_pci_phb_driver);
122 }
123
124 device_initcall(of_pci_phb_init);
125
126 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */
127