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 /** 68 * pcibios_remove_pci_devices - remove all devices under this bus 69 * 70 * Remove all of the PCI devices under this bus both from the 71 * linux pci device tree, and from the powerpc EEH address cache. 72 */ 73 void pcibios_remove_pci_devices(struct pci_bus *bus) 74 { 75 struct pci_dev *dev, *tmp; 76 struct pci_bus *child_bus; 77 78 /* First go down child busses */ 79 list_for_each_entry(child_bus, &bus->children, node) 80 pcibios_remove_pci_devices(child_bus); 81 82 pr_debug("PCI: Removing devices on bus %04x:%02x\n", 83 pci_domain_nr(bus), bus->number); 84 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 85 pr_debug(" * Removing %s...\n", pci_name(dev)); 86 eeh_remove_bus_device(dev); 87 pci_remove_bus_device(dev); 88 } 89 } 90 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices); 91 92 /** 93 * pcibios_add_pci_devices - adds new pci devices to bus 94 * 95 * This routine will find and fixup new pci devices under 96 * the indicated bus. This routine presumes that there 97 * might already be some devices under this bridge, so 98 * it carefully tries to add only new devices. (And that 99 * is how this routine differs from other, similar pcibios 100 * routines.) 101 */ 102 void pcibios_add_pci_devices(struct pci_bus * bus) 103 { 104 int slotno, num, mode, pass, max; 105 struct pci_dev *dev; 106 struct device_node *dn = pci_bus_to_OF_node(bus); 107 108 eeh_add_device_tree_early(dn); 109 110 mode = PCI_PROBE_NORMAL; 111 if (ppc_md.pci_probe_mode) 112 mode = ppc_md.pci_probe_mode(bus); 113 114 if (mode == PCI_PROBE_DEVTREE) { 115 /* use ofdt-based probe */ 116 of_rescan_bus(dn, bus); 117 } else if (mode == PCI_PROBE_NORMAL) { 118 /* use legacy probe */ 119 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 120 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 121 if (!num) 122 return; 123 pcibios_setup_bus_devices(bus); 124 max = bus->secondary; 125 for (pass=0; pass < 2; pass++) 126 list_for_each_entry(dev, &bus->devices, bus_list) { 127 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 128 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 129 max = pci_scan_bridge(bus, dev, max, pass); 130 } 131 } 132 pcibios_finish_adding_to_bus(bus); 133 } 134 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); 135 136 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn) 137 { 138 struct pci_controller *phb; 139 140 pr_debug("PCI: Initializing new hotplug PHB %s\n", dn->full_name); 141 142 phb = pcibios_alloc_controller(dn); 143 if (!phb) 144 return NULL; 145 rtas_setup_phb(phb); 146 pci_process_bridge_OF_ranges(phb, dn, 0); 147 148 pci_devs_phb_init_dynamic(phb); 149 150 if (dn->child) 151 eeh_add_device_tree_early(dn); 152 153 pcibios_scan_phb(phb); 154 pcibios_finish_adding_to_bus(phb->bus); 155 156 return phb; 157 } 158 EXPORT_SYMBOL_GPL(init_phb_dynamic); 159 160 /* RPA-specific bits for removing PHBs */ 161 int remove_phb_dynamic(struct pci_controller *phb) 162 { 163 struct pci_bus *b = phb->bus; 164 struct resource *res; 165 int rc, i; 166 167 pr_debug("PCI: Removing PHB %04x:%02x...\n", 168 pci_domain_nr(b), b->number); 169 170 /* We cannot to remove a root bus that has children */ 171 if (!(list_empty(&b->children) && list_empty(&b->devices))) 172 return -EBUSY; 173 174 /* We -know- there aren't any child devices anymore at this stage 175 * and thus, we can safely unmap the IO space as it's not in use 176 */ 177 res = &phb->io_resource; 178 if (res->flags & IORESOURCE_IO) { 179 rc = pcibios_unmap_io_space(b); 180 if (rc) { 181 printk(KERN_ERR "%s: failed to unmap IO on bus %s\n", 182 __func__, b->name); 183 return 1; 184 } 185 } 186 187 /* Unregister the bridge device from sysfs and remove the PCI bus */ 188 device_unregister(b->bridge); 189 phb->bus = NULL; 190 pci_remove_bus(b); 191 192 /* Now release the IO resource */ 193 if (res->flags & IORESOURCE_IO) 194 release_resource(res); 195 196 /* Release memory resources */ 197 for (i = 0; i < 3; ++i) { 198 res = &phb->mem_resources[i]; 199 if (!(res->flags & IORESOURCE_MEM)) 200 continue; 201 release_resource(res); 202 } 203 204 /* Free pci_controller data structure */ 205 pcibios_free_controller(phb); 206 207 return 0; 208 } 209 EXPORT_SYMBOL_GPL(remove_phb_dynamic); 210