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gerrit.nordix.org / codeaurora / cp-linux / 8d8f6542b666daf5e87de156590e635c2c4da0c0 / . / arch / powerpc / kernel / of_platform.c
blob: b60a67d92ebd0493e67762b9394a02caab60738a [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -0600[diff] [blame^]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
40static 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 %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 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
100static 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
109static 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
117static __init int of_pci_phb_init(void)
118{
119 return platform_driver_register(&of_pci_phb_driver);
120}
121
122device_initcall(of_pci_phb_init);
123
124#endif /* CONFIG_PPC_OF_PLATFORM_PCI */