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_release_device - release PCI device 26 * @dev: PCI device 27 * 28 * The function is called before releasing the indicated PCI device. 29 */ 30 void pcibios_release_device(struct pci_dev *dev) 31 { 32 struct pci_controller *phb = pci_bus_to_host(dev->bus); 33 34 eeh_remove_device(dev); 35 36 if (phb->controller_ops.release_device) 37 phb->controller_ops.release_device(dev); 38 } 39 40 /** 41 * pcibios_remove_pci_devices - remove all devices under this bus 42 * @bus: the indicated PCI bus 43 * 44 * Remove all of the PCI devices under this bus both from the 45 * linux pci device tree, and from the powerpc EEH address cache. 46 */ 47 void pcibios_remove_pci_devices(struct pci_bus *bus) 48 { 49 struct pci_dev *dev, *tmp; 50 struct pci_bus *child_bus; 51 52 /* First go down child busses */ 53 list_for_each_entry(child_bus, &bus->children, node) 54 pcibios_remove_pci_devices(child_bus); 55 56 pr_debug("PCI: Removing devices on bus %04x:%02x\n", 57 pci_domain_nr(bus), bus->number); 58 list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { 59 pr_debug(" Removing %s...\n", pci_name(dev)); 60 pci_stop_and_remove_bus_device(dev); 61 } 62 } 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, mode, pass, max; 80 struct pci_dev *dev; 81 struct pci_controller *phb; 82 struct device_node *dn = pci_bus_to_OF_node(bus); 83 84 eeh_add_device_tree_early(PCI_DN(dn)); 85 86 phb = pci_bus_to_host(bus); 87 88 mode = PCI_PROBE_NORMAL; 89 if (phb->controller_ops.probe_mode) 90 mode = phb->controller_ops.probe_mode(bus); 91 92 if (mode == PCI_PROBE_DEVTREE) { 93 /* use ofdt-based probe */ 94 of_rescan_bus(dn, bus); 95 } else if (mode == PCI_PROBE_NORMAL) { 96 /* 97 * Use legacy probe. In the partial hotplug case, we 98 * probably have grandchildren devices unplugged. So 99 * we don't check the return value from pci_scan_slot() in 100 * order for fully rescan all the way down to pick them up. 101 * They can have been removed during partial hotplug. 102 */ 103 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); 104 pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); 105 pcibios_setup_bus_devices(bus); 106 max = bus->busn_res.start; 107 for (pass = 0; pass < 2; pass++) { 108 list_for_each_entry(dev, &bus->devices, bus_list) { 109 if (pci_is_bridge(dev)) 110 max = pci_scan_bridge(bus, dev, 111 max, pass); 112 } 113 } 114 } 115 pcibios_finish_adding_to_bus(bus); 116 } 117 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); 118