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/module.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 
25 #include <asm/errno.h>
26 #include <asm/topology.h>
27 #include <asm/pci-bridge.h>
28 #include <asm/ppc-pci.h>
29 #include <asm/atomic.h>
30 
31 #ifdef CONFIG_PPC_OF_PLATFORM_PCI
32 
33 /* The probing of PCI controllers from of_platform is currently
34  * 64 bits only, mostly due to gratuitous differences between
35  * the 32 and 64 bits PCI code on PowerPC and the 32 bits one
36  * lacking some bits needed here.
37  */
38 
39 static int __devinit of_pci_phb_probe(struct platform_device *dev,
40 				      const struct of_device_id *match)
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 	/* Register devices with EEH */
71 #ifdef CONFIG_EEH
72 	if (dev->dev.of_node->child)
73 		eeh_add_device_tree_early(dev->dev.of_node);
74 #endif /* CONFIG_EEH */
75 
76 	/* Scan the bus */
77 	pcibios_scan_phb(phb, dev->dev.of_node);
78 	if (phb->bus == NULL)
79 		return -ENXIO;
80 
81 	/* Claim resources. This might need some rework as well depending
82 	 * wether we are doing probe-only or not, like assigning unassigned
83 	 * resources etc...
84 	 */
85 	pcibios_claim_one_bus(phb->bus);
86 
87 	/* Finish EEH setup */
88 #ifdef CONFIG_EEH
89 	eeh_add_device_tree_late(phb->bus);
90 #endif
91 
92 	/* Add probed PCI devices to the device model */
93 	pci_bus_add_devices(phb->bus);
94 
95 	return 0;
96 }
97 
98 static struct of_device_id of_pci_phb_ids[] = {
99 	{ .type = "pci", },
100 	{ .type = "pcix", },
101 	{ .type = "pcie", },
102 	{ .type = "pciex", },
103 	{ .type = "ht", },
104 	{}
105 };
106 
107 static struct of_platform_driver of_pci_phb_driver = {
108 	.probe = of_pci_phb_probe,
109 	.driver = {
110 		.name = "of-pci",
111 		.owner = THIS_MODULE,
112 		.of_match_table = of_pci_phb_ids,
113 	},
114 };
115 
116 static __init int of_pci_phb_init(void)
117 {
118 	return of_register_platform_driver(&of_pci_phb_driver);
119 }
120 
121 device_initcall(of_pci_phb_init);
122 
123 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */
124