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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 | /** | |
20ee6a97 GS |
68 | * __pcibios_remove_pci_devices - remove all devices under this bus |
69 | * @bus: the indicated PCI bus | |
70 | * @purge_pe: destroy the PE on removal of PCI devices | |
2bf6a8fa LV |
71 | * |
72 | * Remove all of the PCI devices under this bus both from the | |
73 | * linux pci device tree, and from the powerpc EEH address cache. | |
20ee6a97 GS |
74 | * By default, the corresponding PE will be destroied during the |
75 | * normal PCI hotplug path. For PCI hotplug during EEH recovery, | |
76 | * the corresponding PE won't be destroied and deallocated. | |
2bf6a8fa | 77 | */ |
20ee6a97 | 78 | void __pcibios_remove_pci_devices(struct pci_bus *bus, int purge_pe) |
2bf6a8fa | 79 | { |
20ee6a97 | 80 | struct pci_dev *dev, *tmp; |
fd6852c8 BH |
81 | struct pci_bus *child_bus; |
82 | ||
83 | /* First go down child busses */ | |
84 | list_for_each_entry(child_bus, &bus->children, node) | |
20ee6a97 | 85 | __pcibios_remove_pci_devices(child_bus, purge_pe); |
2bf6a8fa | 86 | |
fd6852c8 | 87 | pr_debug("PCI: Removing devices on bus %04x:%02x\n", |
20ee6a97 | 88 | pci_domain_nr(bus), bus->number); |
2bf6a8fa | 89 | list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { |
fd6852c8 | 90 | pr_debug(" * Removing %s...\n", pci_name(dev)); |
20ee6a97 GS |
91 | eeh_remove_bus_device(dev, purge_pe); |
92 | pci_stop_and_remove_bus_device(dev); | |
93 | } | |
94 | } | |
95 | ||
96 | /** | |
97 | * pcibios_remove_pci_devices - remove all devices under this bus | |
98 | * | |
99 | * Remove all of the PCI devices under this bus both from the | |
100 | * linux pci device tree, and from the powerpc EEH address cache. | |
101 | */ | |
102 | void pcibios_remove_pci_devices(struct pci_bus *bus) | |
103 | { | |
104 | __pcibios_remove_pci_devices(bus, 1); | |
2bf6a8fa | 105 | } |
fb39a96e | 106 | EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices); |
2bf6a8fa | 107 | |
2bf6a8fa LV |
108 | /** |
109 | * pcibios_add_pci_devices - adds new pci devices to bus | |
110 | * | |
111 | * This routine will find and fixup new pci devices under | |
112 | * the indicated bus. This routine presumes that there | |
113 | * might already be some devices under this bridge, so | |
114 | * it carefully tries to add only new devices. (And that | |
115 | * is how this routine differs from other, similar pcibios | |
116 | * routines.) | |
117 | */ | |
fd6852c8 | 118 | void pcibios_add_pci_devices(struct pci_bus * bus) |
2bf6a8fa | 119 | { |
fd6852c8 | 120 | int slotno, num, mode, pass, max; |
2bf6a8fa LV |
121 | struct pci_dev *dev; |
122 | struct device_node *dn = pci_bus_to_OF_node(bus); | |
123 | ||
124 | eeh_add_device_tree_early(dn); | |
125 | ||
16cc11da JR |
126 | mode = PCI_PROBE_NORMAL; |
127 | if (ppc_md.pci_probe_mode) | |
128 | mode = ppc_md.pci_probe_mode(bus); | |
129 | ||
130 | if (mode == PCI_PROBE_DEVTREE) { | |
827c1a6c | 131 | /* use ofdt-based probe */ |
fd6852c8 | 132 | of_rescan_bus(dn, bus); |
16cc11da | 133 | } else if (mode == PCI_PROBE_NORMAL) { |
827c1a6c JR |
134 | /* use legacy probe */ |
135 | slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); | |
136 | num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); | |
fd6852c8 BH |
137 | if (!num) |
138 | return; | |
139 | pcibios_setup_bus_devices(bus); | |
b918c62e | 140 | max = bus->busn_res.start; |
fd6852c8 BH |
141 | for (pass=0; pass < 2; pass++) |
142 | list_for_each_entry(dev, &bus->devices, bus_list) { | |
143 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || | |
144 | dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) | |
145 | max = pci_scan_bridge(bus, dev, max, pass); | |
827c1a6c | 146 | } |
2bf6a8fa | 147 | } |
fd6852c8 | 148 | pcibios_finish_adding_to_bus(bus); |
2bf6a8fa | 149 | } |
f9bdfa0e | 150 | EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); |
92eb4602 | 151 | |
cad5cef6 | 152 | struct pci_controller *init_phb_dynamic(struct device_node *dn) |
92eb4602 JR |
153 | { |
154 | struct pci_controller *phb; | |
92eb4602 | 155 | |
fd6852c8 BH |
156 | pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name); |
157 | ||
92eb4602 JR |
158 | phb = pcibios_alloc_controller(dn); |
159 | if (!phb) | |
160 | return NULL; | |
4c9d2800 | 161 | rtas_setup_phb(phb); |
92eb4602 JR |
162 | pci_process_bridge_OF_ranges(phb, dn, 0); |
163 | ||
92eb4602 JR |
164 | pci_devs_phb_init_dynamic(phb); |
165 | ||
eb740b5f GS |
166 | /* Create EEH devices for the PHB */ |
167 | eeh_dev_phb_init_dynamic(phb); | |
168 | ||
92eb4602 JR |
169 | if (dn->child) |
170 | eeh_add_device_tree_early(dn); | |
171 | ||
b5d937de | 172 | pcibios_scan_phb(phb); |
fd6852c8 | 173 | pcibios_finish_adding_to_bus(phb->bus); |
92eb4602 JR |
174 | |
175 | return phb; | |
176 | } | |
177 | EXPORT_SYMBOL_GPL(init_phb_dynamic); | |
fd6852c8 BH |
178 | |
179 | /* RPA-specific bits for removing PHBs */ | |
180 | int remove_phb_dynamic(struct pci_controller *phb) | |
181 | { | |
182 | struct pci_bus *b = phb->bus; | |
183 | struct resource *res; | |
184 | int rc, i; | |
185 | ||
8354be9c | 186 | pr_debug("PCI: Removing PHB %04x:%02x...\n", |
fd6852c8 BH |
187 | pci_domain_nr(b), b->number); |
188 | ||
189 | /* We cannot to remove a root bus that has children */ | |
190 | if (!(list_empty(&b->children) && list_empty(&b->devices))) | |
191 | return -EBUSY; | |
192 | ||
193 | /* We -know- there aren't any child devices anymore at this stage | |
194 | * and thus, we can safely unmap the IO space as it's not in use | |
195 | */ | |
196 | res = &phb->io_resource; | |
197 | if (res->flags & IORESOURCE_IO) { | |
198 | rc = pcibios_unmap_io_space(b); | |
199 | if (rc) { | |
200 | printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", | |
201 | __func__, b->name); | |
202 | return 1; | |
203 | } | |
204 | } | |
205 | ||
206 | /* Unregister the bridge device from sysfs and remove the PCI bus */ | |
207 | device_unregister(b->bridge); | |
208 | phb->bus = NULL; | |
209 | pci_remove_bus(b); | |
210 | ||
211 | /* Now release the IO resource */ | |
212 | if (res->flags & IORESOURCE_IO) | |
213 | release_resource(res); | |
214 | ||
215 | /* Release memory resources */ | |
216 | for (i = 0; i < 3; ++i) { | |
217 | res = &phb->mem_resources[i]; | |
218 | if (!(res->flags & IORESOURCE_MEM)) | |
219 | continue; | |
220 | release_resource(res); | |
221 | } | |
222 | ||
223 | /* Free pci_controller data structure */ | |
224 | pcibios_free_controller(phb); | |
225 | ||
226 | return 0; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(remove_phb_dynamic); |