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2bf6a8fa LV |
1 | /* |
2 | * PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code | |
3 | * for RPA-compliant PPC64 platform. | |
4 | * Copyright (C) 2003 Linda Xie <lxie@us.ibm.com> | |
5 | * Copyright (C) 2005 International Business Machines | |
6 | * | |
7 | * Updates, 2005, John Rose <johnrose@austin.ibm.com> | |
8 | * Updates, 2005, Linas Vepstas <linas@austin.ibm.com> | |
9 | * | |
10 | * All rights reserved. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * This program is distributed in the hope that it will be useful, but | |
18 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
20 | * NON INFRINGEMENT. See the GNU General Public License for more | |
21 | * details. | |
22 | * | |
23 | * You should have received a copy of the GNU General Public License | |
24 | * along with this program; if not, write to the Free Software | |
25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
26 | */ | |
27 | ||
28 | #include <linux/pci.h> | |
29 | #include <asm/pci-bridge.h> | |
30 | ||
31 | static struct pci_bus * | |
32 | find_bus_among_children(struct pci_bus *bus, | |
33 | struct device_node *dn) | |
34 | { | |
35 | struct pci_bus *child = NULL; | |
36 | struct list_head *tmp; | |
37 | struct device_node *busdn; | |
38 | ||
39 | busdn = pci_bus_to_OF_node(bus); | |
40 | if (busdn == dn) | |
41 | return bus; | |
42 | ||
43 | list_for_each(tmp, &bus->children) { | |
44 | child = find_bus_among_children(pci_bus_b(tmp), dn); | |
45 | if (child) | |
46 | break; | |
47 | }; | |
48 | return child; | |
49 | } | |
50 | ||
51 | struct pci_bus * | |
52 | pcibios_find_pci_bus(struct device_node *dn) | |
53 | { | |
54 | struct pci_dn *pdn = dn->data; | |
55 | ||
56 | if (!pdn || !pdn->phb || !pdn->phb->bus) | |
57 | return NULL; | |
58 | ||
59 | return find_bus_among_children(pdn->phb->bus, dn); | |
60 | } | |
f9bdfa0e | 61 | EXPORT_SYMBOL_GPL(pcibios_find_pci_bus); |
2bf6a8fa LV |
62 | |
63 | /** | |
64 | * pcibios_remove_pci_devices - remove all devices under this bus | |
65 | * | |
66 | * Remove all of the PCI devices under this bus both from the | |
67 | * linux pci device tree, and from the powerpc EEH address cache. | |
68 | */ | |
69 | void | |
70 | pcibios_remove_pci_devices(struct pci_bus *bus) | |
71 | { | |
72 | struct pci_dev *dev, *tmp; | |
73 | ||
74 | list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { | |
75 | eeh_remove_bus_device(dev); | |
76 | pci_remove_bus_device(dev); | |
77 | } | |
78 | } | |
79 | ||
80 | /* Must be called before pci_bus_add_devices */ | |
31087d7d | 81 | void |
2bf6a8fa LV |
82 | pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) |
83 | { | |
84 | struct pci_dev *dev; | |
85 | ||
86 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
87 | /* | |
88 | * Skip already-present devices (which are on the | |
89 | * global device list.) | |
90 | */ | |
91 | if (list_empty(&dev->global_list)) { | |
92 | int i; | |
93 | ||
94 | /* Need to setup IOMMU tables */ | |
95 | ppc_md.iommu_dev_setup(dev); | |
96 | ||
97 | if(fix_bus) | |
98 | pcibios_fixup_device_resources(dev, bus); | |
99 | pci_read_irq_line(dev); | |
100 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { | |
101 | struct resource *r = &dev->resource[i]; | |
102 | ||
103 | if (r->parent || !r->start || !r->flags) | |
104 | continue; | |
105 | pci_claim_resource(dev, i); | |
106 | } | |
107 | } | |
108 | } | |
827c1a6c JR |
109 | |
110 | eeh_add_device_tree_late(bus); | |
2bf6a8fa | 111 | } |
f9bdfa0e | 112 | EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices); |
2bf6a8fa LV |
113 | |
114 | static int | |
115 | pcibios_pci_config_bridge(struct pci_dev *dev) | |
116 | { | |
117 | u8 sec_busno; | |
118 | struct pci_bus *child_bus; | |
2bf6a8fa LV |
119 | |
120 | /* Get busno of downstream bus */ | |
121 | pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); | |
122 | ||
123 | /* Add to children of PCI bridge dev->bus */ | |
124 | child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); | |
125 | if (!child_bus) { | |
126 | printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__); | |
127 | return -EIO; | |
128 | } | |
129 | sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); | |
130 | ||
131 | pci_scan_child_bus(child_bus); | |
132 | ||
2bf6a8fa LV |
133 | /* Fixup new pci devices without touching bus struct */ |
134 | pcibios_fixup_new_pci_devices(child_bus, 0); | |
135 | ||
136 | /* Make the discovered devices available */ | |
137 | pci_bus_add_devices(child_bus); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /** | |
142 | * pcibios_add_pci_devices - adds new pci devices to bus | |
143 | * | |
144 | * This routine will find and fixup new pci devices under | |
145 | * the indicated bus. This routine presumes that there | |
146 | * might already be some devices under this bridge, so | |
147 | * it carefully tries to add only new devices. (And that | |
148 | * is how this routine differs from other, similar pcibios | |
149 | * routines.) | |
150 | */ | |
151 | void | |
152 | pcibios_add_pci_devices(struct pci_bus * bus) | |
153 | { | |
154 | int slotno, num; | |
155 | struct pci_dev *dev; | |
156 | struct device_node *dn = pci_bus_to_OF_node(bus); | |
157 | ||
158 | eeh_add_device_tree_early(dn); | |
159 | ||
827c1a6c JR |
160 | if (_machine == PLATFORM_PSERIES_LPAR) { |
161 | /* use ofdt-based probe */ | |
162 | of_scan_bus(dn, bus); | |
163 | if (!list_empty(&bus->devices)) { | |
164 | pcibios_fixup_new_pci_devices(bus, 0); | |
165 | pci_bus_add_devices(bus); | |
166 | } | |
167 | } else { | |
168 | /* use legacy probe */ | |
169 | slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); | |
170 | num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); | |
171 | if (num) { | |
172 | pcibios_fixup_new_pci_devices(bus, 1); | |
173 | pci_bus_add_devices(bus); | |
174 | } | |
2bf6a8fa | 175 | |
827c1a6c JR |
176 | list_for_each_entry(dev, &bus->devices, bus_list) |
177 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) | |
178 | pcibios_pci_config_bridge(dev); | |
2bf6a8fa LV |
179 | } |
180 | } | |
f9bdfa0e | 181 | EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); |