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 
40 static int 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 %pOF\n", dev->dev.of_node);
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 	if (dev->dev.of_node->child)
75 		eeh_add_device_tree_early(PCI_DN(dev->dev.of_node));
76 
77 	/* Scan the bus */
78 	pcibios_scan_phb(phb);
79 	if (phb->bus == NULL)
80 		return -ENXIO;
81 
82 	/* Claim resources. This might need some rework as well depending
83 	 * whether we are doing probe-only or not, like assigning unassigned
84 	 * resources etc...
85 	 */
86 	pcibios_claim_one_bus(phb->bus);
87 
88 	/* Finish EEH setup */
89 	eeh_add_device_tree_late(phb->bus);
90 
91 	/* Add probed PCI devices to the device model */
92 	pci_bus_add_devices(phb->bus);
93 
94 	/* sysfs files should only be added after devices are added */
95 	eeh_add_sysfs_files(phb->bus);
96 
97 	return 0;
98 }
99 
100 static const struct of_device_id of_pci_phb_ids[] = {
101 	{ .type = "pci", },
102 	{ .type = "pcix", },
103 	{ .type = "pcie", },
104 	{ .type = "pciex", },
105 	{ .type = "ht", },
106 	{}
107 };
108 
109 static struct platform_driver of_pci_phb_driver = {
110 	.probe = of_pci_phb_probe,
111 	.driver = {
112 		.name = "of-pci",
113 		.of_match_table = of_pci_phb_ids,
114 	},
115 };
116 
117 builtin_platform_driver(of_pci_phb_driver);
118 
119 #endif /* CONFIG_PPC_OF_PLATFORM_PCI */
120