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linux/arch/powerpc/platforms/pseries/pci_dlpar.c
Grant Likely 0ed2c722c6 powerpc/pci: Merge ppc32 and ppc64 versions of phb_scan()
The two versions are doing almost exactly the same thing.  No need to
maintain them as separate files.  This patch also has the side effect
of making the PCI device tree scanning code available to 32 bit powerpc
machines, but no board ports actually make use of this feature at this
point.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-09-02 15:45:53 +10:00

211 lines
5.6 KiB
C

/*
* 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.
*/
#undef DEBUG
#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;
struct pci_bus *child_bus;
/* First go down child busses */
list_for_each_entry(child_bus, &bus->children, node)
pcibios_remove_pci_devices(child_bus);
pr_debug("PCI: Removing devices on bus %04x:%02x\n",
pci_domain_nr(bus), bus->number);
list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
pr_debug(" * Removing %s...\n", pci_name(dev));
eeh_remove_bus_device(dev);
pci_remove_bus_device(dev);
}
}
EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
/**
* 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, pass, max;
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_rescan_bus(dn, 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)
return;
pcibios_setup_bus_devices(bus);
max = bus->secondary;
for (pass=0; pass < 2; pass++)
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE ||
dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
max = pci_scan_bridge(bus, dev, max, pass);
}
}
pcibios_finish_adding_to_bus(bus);
}
EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
{
struct pci_controller *phb;
pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name);
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);
pcibios_scan_phb(phb, dn);
pcibios_finish_adding_to_bus(phb->bus);
return phb;
}
EXPORT_SYMBOL_GPL(init_phb_dynamic);
/* RPA-specific bits for removing PHBs */
int remove_phb_dynamic(struct pci_controller *phb)
{
struct pci_bus *b = phb->bus;
struct resource *res;
int rc, i;
pr_debug("PCI: Removing PHB %04x:%02x... \n",
pci_domain_nr(b), b->number);
/* We cannot to remove a root bus that has children */
if (!(list_empty(&b->children) && list_empty(&b->devices)))
return -EBUSY;
/* We -know- there aren't any child devices anymore at this stage
* and thus, we can safely unmap the IO space as it's not in use
*/
res = &phb->io_resource;
if (res->flags & IORESOURCE_IO) {
rc = pcibios_unmap_io_space(b);
if (rc) {
printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
__func__, b->name);
return 1;
}
}
/* Unregister the bridge device from sysfs and remove the PCI bus */
device_unregister(b->bridge);
phb->bus = NULL;
pci_remove_bus(b);
/* Now release the IO resource */
if (res->flags & IORESOURCE_IO)
release_resource(res);
/* Release memory resources */
for (i = 0; i < 3; ++i) {
res = &phb->mem_resources[i];
if (!(res->flags & IORESOURCE_MEM))
continue;
release_resource(res);
}
/* Free pci_controller data structure */
pcibios_free_controller(phb);
return 0;
}
EXPORT_SYMBOL_GPL(remove_phb_dynamic);