/*
* PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
* for RPA-compliant PPC64 platform.
* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
* Copyright (C) 2005 International Business Machines
*
* Updates, 2005, John Rose <johnrose@austin.ibm.com>
* Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/pci.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/firmware.h>
#include <asm/eeh.h>
static struct pci_bus *
find_bus_among_children(struct pci_bus *bus,
struct device_node *dn)
{
struct pci_bus *child = NULL;
struct list_head *tmp;
struct device_node *busdn;
busdn = pci_bus_to_OF_node(bus);
if (busdn == dn)
return bus;
list_for_each(tmp, &bus->children) {
child = find_bus_among_children(pci_bus_b(tmp), dn);
if (child)
break;
};
return child;
}
struct pci_bus *
pcibios_find_pci_bus(struct device_node *dn)
{
struct pci_dn *pdn = dn->data;
if (!pdn || !pdn->phb || !pdn->phb->bus)
return NULL;
return find_bus_among_children(pdn->phb->bus, dn);
}
EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
/**
* pcibios_remove_pci_devices - remove all devices under this bus
*
* Remove all of the PCI devices under this bus both from the
* linux pci device tree, and from the powerpc EEH address cache.
*/
void
pcibios_remove_pci_devices(struct pci_bus *bus)
{
struct pci_dev *dev, *tmp;
list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
eeh_remove_bus_device(dev);
pci_remove_bus_device(dev);
}
}
EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
/* Must be called before pci_bus_add_devices */
void
pcibios_fixup_new_pci_devices(struct pci_bus *bus)
{
struct pci_dev *dev;
list_for_each_entry(dev, &bus->devices, bus_list) {
/* Skip already-added devices */
if (!dev->is_added) {
int i;
/* Fill device archdata and setup iommu table */
pcibios_setup_new_device(dev);
pci_read_irq_line(dev);
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
struct resource *r = &dev->resource[i];
if (r->parent || !r->start || !r->flags)
continue;
pci_claim_resource(dev, i);
}
}
}
}
EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
static int
pcibios_pci_config_bridge(struct pci_dev *dev)
{
u8 sec_busno;
struct pci_bus *child_bus;
/* Get busno of downstream bus */
pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
/* Add to children of PCI bridge dev->bus */
child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
if (!child_bus) {
printk (KERN_ERR "%s: could not add second bus\n", __func__);
return -EIO;
}
sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
pci_scan_child_bus(child_bus);
/* Fixup new pci devices */
pcibios_fixup_new_pci_devices(child_bus);
/* Make the discovered devices available */
pci_bus_add_devices(child_bus);
eeh_add_device_tree_late(child_bus);
return 0;
}
/**
* pcibios_add_pci_devices - adds new pci devices to bus
*
* This routine will find and fixup new pci devices under
* the indicated bus. This routine presumes that there
* might already be some devices under this bridge, so
* it carefully tries to add only new devices. (And that
* is how this routine differs from other, similar pcibios
* routines.)
*/
void
pcibios_add_pci_devices(struct pci_bus * bus)
{
int slotno, num, mode;
struct pci_dev *dev;
struct device_node *dn = pci_bus_to_OF_node(bus);
eeh_add_device_tree_early(dn);
mode = PCI_PROBE_NORMAL;
if (ppc_md.pci_probe_mode)
mode = ppc_md.pci_probe_mode(bus);
if (mode == PCI_PROBE_DEVTREE) {
/* use ofdt-based probe */
of_scan_bus(dn, bus);
if (!list_empty(&bus->devices)) {
pcibios_fixup_new_pci_devices(bus);
pci_bus_add_devices(bus);
eeh_add_device_tree_late(bus);
}
} else if (mode == PCI_PROBE_NORMAL) {
/* use legacy probe */
slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
if (num) {
pcibios_fixup_new_pci_devices(bus);
pci_bus_add_devices(bus);
eeh_add_device_tree_late(bus);
}
list_for_each_entry(dev, &bus->devices, bus_list)
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
pcibios_pci_config_bridge(dev);
}
}
EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
{
struct pci_controller *phb;
int primary;
primary = list_empty(&hose_list);
phb = pcibios_alloc_controller(dn);
if (!phb)
return NULL;
rtas_setup_phb(phb);
pci_process_bridge_OF_ranges(phb, dn, 0);
pci_devs_phb_init_dynamic(phb);
if (dn->child)
eeh_add_device_tree_early(dn);
scan_phb(phb);
pcibios_fixup_new_pci_devices(phb->bus);
pci_bus_add_devices(phb->bus);
eeh_add_device_tree_late(phb->bus);
return phb;
}
EXPORT_SYMBOL_GPL(init_phb_dynamic);
