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>
33 static struct pci_bus *
34 find_bus_among_children(struct pci_bus *bus,
35 struct device_node *dn)
37 struct pci_bus *child = NULL;
38 struct list_head *tmp;
39 struct device_node *busdn;
41 busdn = pci_bus_to_OF_node(bus);
45 list_for_each(tmp, &bus->children) {
46 child = find_bus_among_children(pci_bus_b(tmp), dn);
54 pcibios_find_pci_bus(struct device_node *dn)
56 struct pci_dn *pdn = dn->data;
58 if (!pdn || !pdn->phb || !pdn->phb->bus)
61 return find_bus_among_children(pdn->phb->bus, dn);
63 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
66 * pcibios_remove_pci_devices - remove all devices under this bus
68 * Remove all of the PCI devices under this bus both from the
69 * linux pci device tree, and from the powerpc EEH address cache.
72 pcibios_remove_pci_devices(struct pci_bus *bus)
74 struct pci_dev *dev, *tmp;
76 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
77 eeh_remove_bus_device(dev);
78 pci_remove_bus_device(dev);
82 /* Must be called before pci_bus_add_devices */
84 pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
88 list_for_each_entry(dev, &bus->devices, bus_list) {
90 * Skip already-present devices (which are on the
91 * global device list.)
93 if (list_empty(&dev->global_list)) {
96 /* Need to setup IOMMU tables */
97 ppc_md.iommu_dev_setup(dev);
100 pcibios_fixup_device_resources(dev, bus);
101 pci_read_irq_line(dev);
102 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
103 struct resource *r = &dev->resource[i];
105 if (r->parent || !r->start || !r->flags)
107 pci_claim_resource(dev, i);
112 eeh_add_device_tree_late(bus);
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);
144 * pcibios_add_pci_devices - adds new pci devices to bus
146 * This routine will find and fixup new pci devices under
147 * the indicated bus. This routine presumes that there
148 * might already be some devices under this bridge, so
149 * it carefully tries to add only new devices. (And that
150 * is how this routine differs from other, similar pcibios
154 pcibios_add_pci_devices(struct pci_bus * bus)
156 int slotno, num, mode;
158 struct device_node *dn = pci_bus_to_OF_node(bus);
160 eeh_add_device_tree_early(dn);
162 mode = PCI_PROBE_NORMAL;
163 if (ppc_md.pci_probe_mode)
164 mode = ppc_md.pci_probe_mode(bus);
166 if (mode == PCI_PROBE_DEVTREE) {
167 /* use ofdt-based probe */
168 of_scan_bus(dn, bus);
169 if (!list_empty(&bus->devices)) {
170 pcibios_fixup_new_pci_devices(bus, 0);
171 pci_bus_add_devices(bus);
173 } else if (mode == PCI_PROBE_NORMAL) {
174 /* use legacy probe */
175 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
176 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
178 pcibios_fixup_new_pci_devices(bus, 1);
179 pci_bus_add_devices(bus);
182 list_for_each_entry(dev, &bus->devices, bus_list)
183 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
184 pcibios_pci_config_bridge(dev);
187 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
189 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
191 struct pci_controller *phb;
194 primary = list_empty(&hose_list);
195 phb = pcibios_alloc_controller(dn);
199 pci_process_bridge_OF_ranges(phb, dn, 0);
201 pci_setup_phb_io_dynamic(phb, primary);
203 pci_devs_phb_init_dynamic(phb);
206 eeh_add_device_tree_early(dn);
209 pcibios_fixup_new_pci_devices(phb->bus, 0);
210 pci_bus_add_devices(phb->bus);
214 EXPORT_SYMBOL_GPL(init_phb_dynamic);