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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> | |
93087948 | 29 | #include <linux/export.h> |
2bf6a8fa | 30 | #include <asm/pci-bridge.h> |
92eb4602 | 31 | #include <asm/ppc-pci.h> |
e8222502 | 32 | #include <asm/firmware.h> |
c3b9d9ab | 33 | #include <asm/eeh.h> |
2bf6a8fa LV |
34 | |
35 | static struct pci_bus * | |
36 | find_bus_among_children(struct pci_bus *bus, | |
37 | struct device_node *dn) | |
38 | { | |
39 | struct pci_bus *child = NULL; | |
40 | struct list_head *tmp; | |
41 | struct device_node *busdn; | |
42 | ||
43 | busdn = pci_bus_to_OF_node(bus); | |
44 | if (busdn == dn) | |
45 | return bus; | |
46 | ||
47 | list_for_each(tmp, &bus->children) { | |
48 | child = find_bus_among_children(pci_bus_b(tmp), dn); | |
49 | if (child) | |
50 | break; | |
51 | }; | |
52 | return child; | |
53 | } | |
54 | ||
55 | struct pci_bus * | |
56 | pcibios_find_pci_bus(struct device_node *dn) | |
57 | { | |
58 | struct pci_dn *pdn = dn->data; | |
59 | ||
60 | if (!pdn || !pdn->phb || !pdn->phb->bus) | |
61 | return NULL; | |
62 | ||
63 | return find_bus_among_children(pdn->phb->bus, dn); | |
64 | } | |
f9bdfa0e | 65 | EXPORT_SYMBOL_GPL(pcibios_find_pci_bus); |
2bf6a8fa LV |
66 | |
67 | /** | |
68 | * pcibios_remove_pci_devices - remove all devices under this bus | |
69 | * | |
70 | * Remove all of the PCI devices under this bus both from the | |
71 | * linux pci device tree, and from the powerpc EEH address cache. | |
72 | */ | |
fd6852c8 | 73 | void pcibios_remove_pci_devices(struct pci_bus *bus) |
2bf6a8fa | 74 | { |
fd6852c8 BH |
75 | struct pci_dev *dev, *tmp; |
76 | struct pci_bus *child_bus; | |
77 | ||
78 | /* First go down child busses */ | |
79 | list_for_each_entry(child_bus, &bus->children, node) | |
80 | pcibios_remove_pci_devices(child_bus); | |
2bf6a8fa | 81 | |
fd6852c8 BH |
82 | pr_debug("PCI: Removing devices on bus %04x:%02x\n", |
83 | pci_domain_nr(bus), bus->number); | |
2bf6a8fa | 84 | list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { |
fd6852c8 | 85 | pr_debug(" * Removing %s...\n", pci_name(dev)); |
2bf6a8fa | 86 | eeh_remove_bus_device(dev); |
fd6852c8 BH |
87 | pci_remove_bus_device(dev); |
88 | } | |
2bf6a8fa | 89 | } |
fb39a96e | 90 | EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices); |
2bf6a8fa | 91 | |
2bf6a8fa LV |
92 | /** |
93 | * pcibios_add_pci_devices - adds new pci devices to bus | |
94 | * | |
95 | * This routine will find and fixup new pci devices under | |
96 | * the indicated bus. This routine presumes that there | |
97 | * might already be some devices under this bridge, so | |
98 | * it carefully tries to add only new devices. (And that | |
99 | * is how this routine differs from other, similar pcibios | |
100 | * routines.) | |
101 | */ | |
fd6852c8 | 102 | void pcibios_add_pci_devices(struct pci_bus * bus) |
2bf6a8fa | 103 | { |
fd6852c8 | 104 | int slotno, num, mode, pass, max; |
2bf6a8fa LV |
105 | struct pci_dev *dev; |
106 | struct device_node *dn = pci_bus_to_OF_node(bus); | |
107 | ||
108 | eeh_add_device_tree_early(dn); | |
109 | ||
16cc11da JR |
110 | mode = PCI_PROBE_NORMAL; |
111 | if (ppc_md.pci_probe_mode) | |
112 | mode = ppc_md.pci_probe_mode(bus); | |
113 | ||
114 | if (mode == PCI_PROBE_DEVTREE) { | |
827c1a6c | 115 | /* use ofdt-based probe */ |
fd6852c8 | 116 | of_rescan_bus(dn, bus); |
16cc11da | 117 | } else if (mode == PCI_PROBE_NORMAL) { |
827c1a6c JR |
118 | /* use legacy probe */ |
119 | slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); | |
120 | num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); | |
fd6852c8 BH |
121 | if (!num) |
122 | return; | |
123 | pcibios_setup_bus_devices(bus); | |
124 | max = bus->secondary; | |
125 | for (pass=0; pass < 2; pass++) | |
126 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
127 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
128 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
129 | max = pci_scan_bridge(bus, dev, max, pass); | |
827c1a6c | 130 | } |
2bf6a8fa | 131 | } |
fd6852c8 | 132 | pcibios_finish_adding_to_bus(bus); |
2bf6a8fa | 133 | } |
f9bdfa0e | 134 | EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); |
92eb4602 JR |
135 | |
136 | struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn) | |
137 | { | |
138 | struct pci_controller *phb; | |
92eb4602 | 139 | |
fd6852c8 BH |
140 | pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name); |
141 | ||
92eb4602 JR |
142 | phb = pcibios_alloc_controller(dn); |
143 | if (!phb) | |
144 | return NULL; | |
4c9d2800 | 145 | rtas_setup_phb(phb); |
92eb4602 JR |
146 | pci_process_bridge_OF_ranges(phb, dn, 0); |
147 | ||
92eb4602 JR |
148 | pci_devs_phb_init_dynamic(phb); |
149 | ||
150 | if (dn->child) | |
151 | eeh_add_device_tree_early(dn); | |
152 | ||
b5d937de | 153 | pcibios_scan_phb(phb); |
fd6852c8 | 154 | pcibios_finish_adding_to_bus(phb->bus); |
92eb4602 JR |
155 | |
156 | return phb; | |
157 | } | |
158 | EXPORT_SYMBOL_GPL(init_phb_dynamic); | |
fd6852c8 BH |
159 | |
160 | /* RPA-specific bits for removing PHBs */ | |
161 | int remove_phb_dynamic(struct pci_controller *phb) | |
162 | { | |
163 | struct pci_bus *b = phb->bus; | |
164 | struct resource *res; | |
165 | int rc, i; | |
166 | ||
8354be9c | 167 | pr_debug("PCI: Removing PHB %04x:%02x...\n", |
fd6852c8 BH |
168 | pci_domain_nr(b), b->number); |
169 | ||
170 | /* We cannot to remove a root bus that has children */ | |
171 | if (!(list_empty(&b->children) && list_empty(&b->devices))) | |
172 | return -EBUSY; | |
173 | ||
174 | /* We -know- there aren't any child devices anymore at this stage | |
175 | * and thus, we can safely unmap the IO space as it's not in use | |
176 | */ | |
177 | res = &phb->io_resource; | |
178 | if (res->flags & IORESOURCE_IO) { | |
179 | rc = pcibios_unmap_io_space(b); | |
180 | if (rc) { | |
181 | printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", | |
182 | __func__, b->name); | |
183 | return 1; | |
184 | } | |
185 | } | |
186 | ||
187 | /* Unregister the bridge device from sysfs and remove the PCI bus */ | |
188 | device_unregister(b->bridge); | |
189 | phb->bus = NULL; | |
190 | pci_remove_bus(b); | |
191 | ||
192 | /* Now release the IO resource */ | |
193 | if (res->flags & IORESOURCE_IO) | |
194 | release_resource(res); | |
195 | ||
196 | /* Release memory resources */ | |
197 | for (i = 0; i < 3; ++i) { | |
198 | res = &phb->mem_resources[i]; | |
199 | if (!(res->flags & IORESOURCE_MEM)) | |
200 | continue; | |
201 | release_resource(res); | |
202 | } | |
203 | ||
204 | /* Free pci_controller data structure */ | |
205 | pcibios_free_controller(phb); | |
206 | ||
207 | return 0; | |
208 | } | |
209 | EXPORT_SYMBOL_GPL(remove_phb_dynamic); |