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
7 * Updates, 2005, John Rose <johnrose@austin.ibm.com>
8 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
10 * All rights reserved.
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.
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
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.
28 #include <linux/pci.h>
29 #include <asm/pci-bridge.h>
30 #include <asm/ppc-pci.h>
31 #include <asm/firmware.h>
34 static struct pci_bus *
35 find_bus_among_children(struct pci_bus *bus,
36 struct device_node *dn)
38 struct pci_bus *child = NULL;
39 struct list_head *tmp;
40 struct device_node *busdn;
42 busdn = pci_bus_to_OF_node(bus);
46 list_for_each(tmp, &bus->children) {
47 child = find_bus_among_children(pci_bus_b(tmp), dn);
55 pcibios_find_pci_bus(struct device_node *dn)
57 struct pci_dn *pdn = dn->data;
59 if (!pdn || !pdn->phb || !pdn->phb->bus)
62 return find_bus_among_children(pdn->phb->bus, dn);
64 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
67 * pcibios_remove_pci_devices - remove all devices under this bus
69 * Remove all of the PCI devices under this bus both from the
70 * linux pci device tree, and from the powerpc EEH address cache.
73 pcibios_remove_pci_devices(struct pci_bus *bus)
75 struct pci_dev *dev, *tmp;
77 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
78 eeh_remove_bus_device(dev);
79 pci_remove_bus_device(dev);
82 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
84 /* Must be called before pci_bus_add_devices */
86 pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
90 list_for_each_entry(dev, &bus->devices, bus_list) {
92 * Skip already-present devices (which are on the
93 * global device list.)
95 if (list_empty(&dev->global_list)) {
98 /* Fill device archdata and setup iommu table */
99 pcibios_setup_new_device(dev);
102 pcibios_fixup_device_resources(dev, bus);
103 pci_read_irq_line(dev);
104 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
105 struct resource *r = &dev->resource[i];
107 if (r->parent || !r->start || !r->flags)
109 pci_claim_resource(dev, i);
114 EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
117 pcibios_pci_config_bridge(struct pci_dev *dev)
120 struct pci_bus *child_bus;
122 /* Get busno of downstream bus */
123 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
125 /* Add to children of PCI bridge dev->bus */
126 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
128 printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
131 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
133 pci_scan_child_bus(child_bus);
135 /* Fixup new pci devices without touching bus struct */
136 pcibios_fixup_new_pci_devices(child_bus, 0);
138 /* Make the discovered devices available */
139 pci_bus_add_devices(child_bus);
141 eeh_add_device_tree_late(child_bus);
146 * pcibios_add_pci_devices - adds new pci devices to bus
148 * This routine will find and fixup new pci devices under
149 * the indicated bus. This routine presumes that there
150 * might already be some devices under this bridge, so
151 * it carefully tries to add only new devices. (And that
152 * is how this routine differs from other, similar pcibios
156 pcibios_add_pci_devices(struct pci_bus * bus)
158 int slotno, num, mode;
160 struct device_node *dn = pci_bus_to_OF_node(bus);
162 eeh_add_device_tree_early(dn);
164 mode = PCI_PROBE_NORMAL;
165 if (ppc_md.pci_probe_mode)
166 mode = ppc_md.pci_probe_mode(bus);
168 if (mode == PCI_PROBE_DEVTREE) {
169 /* use ofdt-based probe */
170 of_scan_bus(dn, bus);
171 if (!list_empty(&bus->devices)) {
172 pcibios_fixup_new_pci_devices(bus, 0);
173 pci_bus_add_devices(bus);
174 eeh_add_device_tree_late(bus);
176 } else if (mode == PCI_PROBE_NORMAL) {
177 /* use legacy probe */
178 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
179 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
181 pcibios_fixup_new_pci_devices(bus, 1);
182 pci_bus_add_devices(bus);
183 eeh_add_device_tree_late(bus);
186 list_for_each_entry(dev, &bus->devices, bus_list)
187 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
188 pcibios_pci_config_bridge(dev);
191 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
193 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
195 struct pci_controller *phb;
198 primary = list_empty(&hose_list);
199 phb = pcibios_alloc_controller(dn);
203 pci_process_bridge_OF_ranges(phb, dn, 0);
205 pci_devs_phb_init_dynamic(phb);
208 eeh_add_device_tree_early(dn);
211 pcibios_fixup_new_pci_devices(phb->bus, 0);
212 pci_bus_add_devices(phb->bus);
213 eeh_add_device_tree_late(phb->bus);
217 EXPORT_SYMBOL_GPL(init_phb_dynamic);