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>
31 static struct pci_bus *
32 find_bus_among_children(struct pci_bus *bus,
33 struct device_node *dn)
35 struct pci_bus *child = NULL;
36 struct list_head *tmp;
37 struct device_node *busdn;
39 busdn = pci_bus_to_OF_node(bus);
43 list_for_each(tmp, &bus->children) {
44 child = find_bus_among_children(pci_bus_b(tmp), dn);
52 pcibios_find_pci_bus(struct device_node *dn)
54 struct pci_dn *pdn = dn->data;
56 if (!pdn || !pdn->phb || !pdn->phb->bus)
59 return find_bus_among_children(pdn->phb->bus, dn);
61 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
64 * pcibios_remove_pci_devices - remove all devices under this bus
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.
70 pcibios_remove_pci_devices(struct pci_bus *bus)
72 struct pci_dev *dev, *tmp;
74 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
75 eeh_remove_bus_device(dev);
76 pci_remove_bus_device(dev);
80 /* Must be called before pci_bus_add_devices */
82 pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
86 list_for_each_entry(dev, &bus->devices, bus_list) {
88 * Skip already-present devices (which are on the
89 * global device list.)
91 if (list_empty(&dev->global_list)) {
94 /* Need to setup IOMMU tables */
95 ppc_md.iommu_dev_setup(dev);
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];
103 if (r->parent || !r->start || !r->flags)
105 pci_claim_resource(dev, i);
110 eeh_add_device_tree_late(bus);
112 EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
115 pcibios_pci_config_bridge(struct pci_dev *dev)
118 struct pci_bus *child_bus;
120 /* Get busno of downstream bus */
121 pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
123 /* Add to children of PCI bridge dev->bus */
124 child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
126 printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
129 sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
131 pci_scan_child_bus(child_bus);
133 /* Fixup new pci devices without touching bus struct */
134 pcibios_fixup_new_pci_devices(child_bus, 0);
136 /* Make the discovered devices available */
137 pci_bus_add_devices(child_bus);
142 * pcibios_add_pci_devices - adds new pci devices to bus
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
152 pcibios_add_pci_devices(struct pci_bus * bus)
156 struct device_node *dn = pci_bus_to_OF_node(bus);
158 eeh_add_device_tree_early(dn);
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);
168 /* use legacy probe */
169 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
170 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
172 pcibios_fixup_new_pci_devices(bus, 1);
173 pci_bus_add_devices(bus);
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);
181 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);