diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/pci_dlpar.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/pci_dlpar.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/pci_dlpar.c b/arch/powerpc/platforms/pseries/pci_dlpar.c new file mode 100644 index 000000000..5d4a3df59 --- /dev/null +++ b/arch/powerpc/platforms/pseries/pci_dlpar.c @@ -0,0 +1,146 @@ +/* + * 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 <linux/export.h> +#include <asm/pci-bridge.h> +#include <asm/ppc-pci.h> +#include <asm/firmware.h> +#include <asm/eeh.h> + +#include "pseries.h" + +static struct pci_bus * +find_bus_among_children(struct pci_bus *bus, + struct device_node *dn) +{ + struct pci_bus *child = NULL; + struct pci_bus *tmp; + struct device_node *busdn; + + busdn = pci_bus_to_OF_node(bus); + if (busdn == dn) + return bus; + + list_for_each_entry(tmp, &bus->children, node) { + child = find_bus_among_children(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); + +struct pci_controller *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); + phb->controller_ops = pseries_pci_controller_ops; + + pci_devs_phb_init_dynamic(phb); + + /* Create EEH devices for the PHB */ + eeh_dev_phb_init_dynamic(phb); + + if (dn->child) + eeh_add_device_tree_early(PCI_DN(dn)); + + pcibios_scan_phb(phb); + 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; + } + } + + /* Remove the PCI bus and unregister the bridge device from sysfs */ + phb->bus = NULL; + pci_remove_bus(b); + device_unregister(b->bridge); + + /* 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); |