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