1 /* 2 * Derived from "arch/powerpc/platforms/pseries/pci_dlpar.c" 3 * 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 * Updates, 2013, Gavin Shan <shangw@linux.vnet.ibm.com> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 */ 16 17 #include <linux/pci.h> 18 #include <linux/export.h> 19 #include <asm/pci-bridge.h> 20 #include <asm/ppc-pci.h> 21 #include <asm/firmware.h> 22 #include <asm/eeh.h> 23 24 /** 25 * __pcibios_remove_pci_devices - remove all devices under this bus 26 * @bus: the indicated PCI bus 27 * @purge_pe: destroy the PE on removal of PCI devices 28 * 29 * Remove all of the PCI devices under this bus both from the 30 * linux pci device tree, and from the powerpc EEH address cache. 31 * By default, the corresponding PE will be destroied during the 32 * normal PCI hotplug path. For PCI hotplug during EEH recovery, 33 * the corresponding PE won't be destroied and deallocated. 34 */ 35 void __pcibios_remove_pci_devices(struct pci_bus *bus, int purge_pe) 36 { 37 struct pci_dev *dev, *tmp; 38 struct pci_bus *child_bus; 39 40 /* First go down child busses */ 41 list_for_each_entry(child_bus, &bus->children, node) 42 __pcibios_remove_pci_devices(child_bus, purge_pe); 43 44 pr_debug("PCI: Removing devices on bus %04x:%02x\n", 45 pci_domain_nr(bus), bus->number); 46 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 47 pr_debug(" * Removing %s...\n", pci_name(dev)); 48 eeh_remove_bus_device(dev, purge_pe); 49 pci_stop_and_remove_bus_device(dev); 50 } 51 } 52 53 /** 54 * pcibios_remove_pci_devices - remove all devices under this bus 55 * @bus: the indicated PCI bus 56 * 57 * Remove all of the PCI devices under this bus both from the 58 * linux pci device tree, and from the powerpc EEH address cache. 59 */ 60 void pcibios_remove_pci_devices(struct pci_bus *bus) 61 { 62 __pcibios_remove_pci_devices(bus, 1); 63 } 64 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices); 65 66 /** 67 * pcibios_add_pci_devices - adds new pci devices to bus 68 * @bus: the indicated PCI bus 69 * 70 * This routine will find and fixup new pci devices under 71 * the indicated bus. This routine presumes that there 72 * might already be some devices under this bridge, so 73 * it carefully tries to add only new devices. (And that 74 * is how this routine differs from other, similar pcibios 75 * routines.) 76 */ 77 void pcibios_add_pci_devices(struct pci_bus * bus) 78 { 79 int slotno, num, mode, pass, max; 80 struct pci_dev *dev; 81 struct device_node *dn = pci_bus_to_OF_node(bus); 82 83 eeh_add_device_tree_early(dn); 84 85 mode = PCI_PROBE_NORMAL; 86 if (ppc_md.pci_probe_mode) 87 mode = ppc_md.pci_probe_mode(bus); 88 89 if (mode == PCI_PROBE_DEVTREE) { 90 /* use ofdt-based probe */ 91 of_rescan_bus(dn, bus); 92 } else if (mode == PCI_PROBE_NORMAL) { 93 /* use legacy probe */ 94 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 95 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 96 if (!num) 97 return; 98 pcibios_setup_bus_devices(bus); 99 max = bus->busn_res.start; 100 for (pass = 0; pass < 2; pass++) { 101 list_for_each_entry(dev, &bus->devices, bus_list) { 102 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE || 103 dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) 104 max = pci_scan_bridge(bus, dev, 105 max, pass); 106 } 107 } 108 } 109 pcibios_finish_adding_to_bus(bus); 110 } 111 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); 112