1 /* 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 6 * 7 * Updates, 2005, John Rose <johnrose@austin.ibm.com> 8 * Updates, 2005, Linas Vepstas <linas@austin.ibm.com> 9 * 10 * All rights reserved. 11 * 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. 16 * 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 21 * details. 22 * 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. 26 */ 27 28 #include <linux/pci.h> 29 #include <linux/export.h> 30 #include <asm/pci-bridge.h> 31 #include <asm/ppc-pci.h> 32 #include <asm/firmware.h> 33 #include <asm/eeh.h> 34 35 #include "pseries.h" 36 37 static struct pci_bus * 38 find_bus_among_children(struct pci_bus *bus, 39 struct device_node *dn) 40 { 41 struct pci_bus *child = NULL; 42 struct pci_bus *tmp; 43 struct device_node *busdn; 44 45 busdn = pci_bus_to_OF_node(bus); 46 if (busdn == dn) 47 return bus; 48 49 list_for_each_entry(tmp, &bus->children, node) { 50 child = find_bus_among_children(tmp, dn); 51 if (child) 52 break; 53 }; 54 return child; 55 } 56 57 struct pci_bus * 58 pcibios_find_pci_bus(struct device_node *dn) 59 { 60 struct pci_dn *pdn = dn->data; 61 62 if (!pdn || !pdn->phb || !pdn->phb->bus) 63 return NULL; 64 65 return find_bus_among_children(pdn->phb->bus, dn); 66 } 67 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus); 68 69 struct pci_controller *init_phb_dynamic(struct device_node *dn) 70 { 71 struct pci_controller *phb; 72 73 pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name); 74 75 phb = pcibios_alloc_controller(dn); 76 if (!phb) 77 return NULL; 78 rtas_setup_phb(phb); 79 pci_process_bridge_OF_ranges(phb, dn, 0); 80 phb->controller_ops = pseries_pci_controller_ops; 81 82 pci_devs_phb_init_dynamic(phb); 83 84 /* Create EEH devices for the PHB */ 85 eeh_dev_phb_init_dynamic(phb); 86 87 if (dn->child) 88 eeh_add_device_tree_early(PCI_DN(dn)); 89 90 pcibios_scan_phb(phb); 91 pcibios_finish_adding_to_bus(phb->bus); 92 93 return phb; 94 } 95 EXPORT_SYMBOL_GPL(init_phb_dynamic); 96 97 /* RPA-specific bits for removing PHBs */ 98 int remove_phb_dynamic(struct pci_controller *phb) 99 { 100 struct pci_bus *b = phb->bus; 101 struct resource *res; 102 int rc, i; 103 104 pr_debug("PCI: Removing PHB %04x:%02x...\n", 105 pci_domain_nr(b), b->number); 106 107 /* We cannot to remove a root bus that has children */ 108 if (!(list_empty(&b->children) && list_empty(&b->devices))) 109 return -EBUSY; 110 111 /* We -know- there aren't any child devices anymore at this stage 112 * and thus, we can safely unmap the IO space as it's not in use 113 */ 114 res = &phb->io_resource; 115 if (res->flags & IORESOURCE_IO) { 116 rc = pcibios_unmap_io_space(b); 117 if (rc) { 118 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", 119 __func__, b->name); 120 return 1; 121 } 122 } 123 124 /* Remove the PCI bus and unregister the bridge device from sysfs */ 125 phb->bus = NULL; 126 pci_remove_bus(b); 127 device_unregister(b->bridge); 128 129 /* Now release the IO resource */ 130 if (res->flags & IORESOURCE_IO) 131 release_resource(res); 132 133 /* Release memory resources */ 134 for (i = 0; i < 3; ++i) { 135 res = &phb->mem_resources[i]; 136 if (!(res->flags & IORESOURCE_MEM)) 137 continue; 138 release_resource(res); 139 } 140 141 /* Free pci_controller data structure */ 142 pcibios_free_controller(phb); 143 144 return 0; 145 } 146 EXPORT_SYMBOL_GPL(remove_phb_dynamic); 147