144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
/*
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* PCI Dynamic LPAR, PCI Hot Plug and PCI EEH recovery code
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* for RPA-compliant PPC64 platform.
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* Copyright (C) 2003 Linda Xie <lxie@us.ibm.com>
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* Copyright (C) 2005 International Business Machines
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*
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* Updates, 2005, John Rose <johnrose@austin.ibm.com>
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* Updates, 2005, Linas Vepstas <linas@austin.ibm.com>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/pci.h>
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#include <linux/export.h>
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#include <asm/pci-bridge.h>
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#include <asm/ppc-pci.h>
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#include <asm/firmware.h>
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#include <asm/eeh.h>
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static struct pci_bus *
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find_bus_among_children(struct pci_bus *bus,
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struct device_node *dn)
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{
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struct pci_bus *child = NULL;
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struct pci_bus *tmp;
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struct device_node *busdn;
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busdn = pci_bus_to_OF_node(bus);
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if (busdn == dn)
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return bus;
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list_for_each_entry(tmp, &bus->children, node) {
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child = find_bus_among_children(tmp, dn);
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if (child)
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break;
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};
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return child;
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}
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struct pci_bus *
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pcibios_find_pci_bus(struct device_node *dn)
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{
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struct pci_dn *pdn = dn->data;
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if (!pdn || !pdn->phb || !pdn->phb->bus)
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return NULL;
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return find_bus_among_children(pdn->phb->bus, dn);
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}
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EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
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struct pci_controller *init_phb_dynamic(struct device_node *dn)
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{
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struct pci_controller *phb;
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pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name);
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phb = pcibios_alloc_controller(dn);
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if (!phb)
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return NULL;
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rtas_setup_phb(phb);
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pci_process_bridge_OF_ranges(phb, dn, 0);
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pci_devs_phb_init_dynamic(phb);
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/* Create EEH devices for the PHB */
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eeh_dev_phb_init_dynamic(phb);
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if (dn->child)
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eeh_add_device_tree_early(dn);
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pcibios_scan_phb(phb);
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pcibios_finish_adding_to_bus(phb->bus);
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return phb;
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}
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EXPORT_SYMBOL_GPL(init_phb_dynamic);
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/* RPA-specific bits for removing PHBs */
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int remove_phb_dynamic(struct pci_controller *phb)
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{
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struct pci_bus *b = phb->bus;
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struct resource *res;
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int rc, i;
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pr_debug("PCI: Removing PHB %04x:%02x...\n",
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pci_domain_nr(b), b->number);
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/* We cannot to remove a root bus that has children */
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if (!(list_empty(&b->children) && list_empty(&b->devices)))
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return -EBUSY;
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/* We -know- there aren't any child devices anymore at this stage
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* and thus, we can safely unmap the IO space as it's not in use
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*/
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res = &phb->io_resource;
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if (res->flags & IORESOURCE_IO) {
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rc = pcibios_unmap_io_space(b);
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if (rc) {
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printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
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__func__, b->name);
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return 1;
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}
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}
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/* Remove the PCI bus and unregister the bridge device from sysfs */
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phb->bus = NULL;
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pci_remove_bus(b);
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device_unregister(b->bridge);
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/* Now release the IO resource */
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if (res->flags & IORESOURCE_IO)
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release_resource(res);
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/* Release memory resources */
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for (i = 0; i < 3; ++i) {
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res = &phb->mem_resources[i];
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if (!(res->flags & IORESOURCE_MEM))
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continue;
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release_resource(res);
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}
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/* Free pci_controller data structure */
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pcibios_free_controller(phb);
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return 0;
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}
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EXPORT_SYMBOL_GPL(remove_phb_dynamic);
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