Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 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 <asm/pci-bridge.h> |
| 30 | |
| 31 | static struct pci_bus * |
| 32 | find_bus_among_children(struct pci_bus *bus, |
| 33 | struct device_node *dn) |
| 34 | { |
| 35 | struct pci_bus *child = NULL; |
| 36 | struct list_head *tmp; |
| 37 | struct device_node *busdn; |
| 38 | |
| 39 | busdn = pci_bus_to_OF_node(bus); |
| 40 | if (busdn == dn) |
| 41 | return bus; |
| 42 | |
| 43 | list_for_each(tmp, &bus->children) { |
| 44 | child = find_bus_among_children(pci_bus_b(tmp), dn); |
| 45 | if (child) |
| 46 | break; |
| 47 | }; |
| 48 | return child; |
| 49 | } |
| 50 | |
| 51 | struct pci_bus * |
| 52 | pcibios_find_pci_bus(struct device_node *dn) |
| 53 | { |
| 54 | struct pci_dn *pdn = dn->data; |
| 55 | |
| 56 | if (!pdn || !pdn->phb || !pdn->phb->bus) |
| 57 | return NULL; |
| 58 | |
| 59 | return find_bus_among_children(pdn->phb->bus, dn); |
| 60 | } |
Linas Vepstas | f9bdfa0 | 2006-02-01 18:19:06 -0600 | [diff] [blame] | 61 | EXPORT_SYMBOL_GPL(pcibios_find_pci_bus); |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 62 | |
| 63 | /** |
| 64 | * pcibios_remove_pci_devices - remove all devices under this bus |
| 65 | * |
| 66 | * Remove all of the PCI devices under this bus both from the |
| 67 | * linux pci device tree, and from the powerpc EEH address cache. |
| 68 | */ |
| 69 | void |
| 70 | pcibios_remove_pci_devices(struct pci_bus *bus) |
| 71 | { |
| 72 | struct pci_dev *dev, *tmp; |
| 73 | |
| 74 | list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) { |
| 75 | eeh_remove_bus_device(dev); |
| 76 | pci_remove_bus_device(dev); |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | /* Must be called before pci_bus_add_devices */ |
linas | 31087d7 | 2005-12-13 13:46:36 -0600 | [diff] [blame] | 81 | void |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 82 | pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus) |
| 83 | { |
| 84 | struct pci_dev *dev; |
| 85 | |
| 86 | list_for_each_entry(dev, &bus->devices, bus_list) { |
| 87 | /* |
| 88 | * Skip already-present devices (which are on the |
| 89 | * global device list.) |
| 90 | */ |
| 91 | if (list_empty(&dev->global_list)) { |
| 92 | int i; |
| 93 | |
| 94 | /* Need to setup IOMMU tables */ |
| 95 | ppc_md.iommu_dev_setup(dev); |
| 96 | |
| 97 | if(fix_bus) |
| 98 | pcibios_fixup_device_resources(dev, bus); |
| 99 | pci_read_irq_line(dev); |
| 100 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| 101 | struct resource *r = &dev->resource[i]; |
| 102 | |
| 103 | if (r->parent || !r->start || !r->flags) |
| 104 | continue; |
| 105 | pci_claim_resource(dev, i); |
| 106 | } |
| 107 | } |
| 108 | } |
John Rose | 827c1a6 | 2006-02-24 11:34:23 -0600 | [diff] [blame^] | 109 | |
| 110 | eeh_add_device_tree_late(bus); |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 111 | } |
Linas Vepstas | f9bdfa0 | 2006-02-01 18:19:06 -0600 | [diff] [blame] | 112 | EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices); |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 113 | |
| 114 | static int |
| 115 | pcibios_pci_config_bridge(struct pci_dev *dev) |
| 116 | { |
| 117 | u8 sec_busno; |
| 118 | struct pci_bus *child_bus; |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 119 | |
| 120 | /* Get busno of downstream bus */ |
| 121 | pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno); |
| 122 | |
| 123 | /* Add to children of PCI bridge dev->bus */ |
| 124 | child_bus = pci_add_new_bus(dev->bus, dev, sec_busno); |
| 125 | if (!child_bus) { |
| 126 | printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__); |
| 127 | return -EIO; |
| 128 | } |
| 129 | sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number); |
| 130 | |
| 131 | pci_scan_child_bus(child_bus); |
| 132 | |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 133 | /* Fixup new pci devices without touching bus struct */ |
| 134 | pcibios_fixup_new_pci_devices(child_bus, 0); |
| 135 | |
| 136 | /* Make the discovered devices available */ |
| 137 | pci_bus_add_devices(child_bus); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * pcibios_add_pci_devices - adds new pci devices to bus |
| 143 | * |
| 144 | * This routine will find and fixup new pci devices under |
| 145 | * the indicated bus. This routine presumes that there |
| 146 | * might already be some devices under this bridge, so |
| 147 | * it carefully tries to add only new devices. (And that |
| 148 | * is how this routine differs from other, similar pcibios |
| 149 | * routines.) |
| 150 | */ |
| 151 | void |
| 152 | pcibios_add_pci_devices(struct pci_bus * bus) |
| 153 | { |
| 154 | int slotno, num; |
| 155 | struct pci_dev *dev; |
| 156 | struct device_node *dn = pci_bus_to_OF_node(bus); |
| 157 | |
| 158 | eeh_add_device_tree_early(dn); |
| 159 | |
John Rose | 827c1a6 | 2006-02-24 11:34:23 -0600 | [diff] [blame^] | 160 | if (_machine == PLATFORM_PSERIES_LPAR) { |
| 161 | /* use ofdt-based probe */ |
| 162 | of_scan_bus(dn, bus); |
| 163 | if (!list_empty(&bus->devices)) { |
| 164 | pcibios_fixup_new_pci_devices(bus, 0); |
| 165 | pci_bus_add_devices(bus); |
| 166 | } |
| 167 | } else { |
| 168 | /* use legacy probe */ |
| 169 | slotno = PCI_SLOT(PCI_DN(dn->child)->devfn); |
| 170 | num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0)); |
| 171 | if (num) { |
| 172 | pcibios_fixup_new_pci_devices(bus, 1); |
| 173 | pci_bus_add_devices(bus); |
| 174 | } |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 175 | |
John Rose | 827c1a6 | 2006-02-24 11:34:23 -0600 | [diff] [blame^] | 176 | list_for_each_entry(dev, &bus->devices, bus_list) |
| 177 | if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) |
| 178 | pcibios_pci_config_bridge(dev); |
Linas Vepstas | 2bf6a8f | 2005-11-03 18:52:16 -0600 | [diff] [blame] | 179 | } |
| 180 | } |
Linas Vepstas | f9bdfa0 | 2006-02-01 18:19:06 -0600 | [diff] [blame] | 181 | EXPORT_SYMBOL_GPL(pcibios_add_pci_devices); |