arch/powerpc/platforms/pseries/pci_dlpar.c

   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 #include <asm/ppc-pci.h>
  31 #include <asm/firmware.h>
  32 #include <asm/eeh.h>
  33
  34 static struct pci_bus *
  35 find_bus_among_children(struct pci_bus *bus,
  36                         struct device_node *dn)
  37 {
  38         struct pci_bus *child = NULL;
  39         struct list_head *tmp;
  40         struct device_node *busdn;
  41
  42         busdn = pci_bus_to_OF_node(bus);
  43         if (busdn == dn)
  44                 return bus;
  45
  46         list_for_each(tmp, &bus->children) {
  47                 child = find_bus_among_children(pci_bus_b(tmp), dn);
  48                 if (child)
  49                         break;
  50         };
  51         return child;
  52 }
  53
  54 struct pci_bus *
  55 pcibios_find_pci_bus(struct device_node *dn)
  56 {
  57         struct pci_dn *pdn = dn->data;
  58
  59         if (!pdn  || !pdn->phb || !pdn->phb->bus)
  60                 return NULL;
  61
  62         return find_bus_among_children(pdn->phb->bus, dn);
  63 }
  64 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
  65
  66 /**
  67  * pcibios_remove_pci_devices - remove all devices under this bus
  68  *
  69  * Remove all of the PCI devices under this bus both from the
  70  * linux pci device tree, and from the powerpc EEH address cache.
  71  */
  72 void
  73 pcibios_remove_pci_devices(struct pci_bus *bus)
  74 {
  75         struct pci_dev *dev, *tmp;
  76
  77         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
  78                 eeh_remove_bus_device(dev);
  79                 pci_remove_bus_device(dev);
  80         }
  81 }
  82 EXPORT_SYMBOL_GPL(pcibios_remove_pci_devices);
  83
  84 /* Must be called before pci_bus_add_devices */
  85 void
  86 pcibios_fixup_new_pci_devices(struct pci_bus *bus)
  87 {
  88         struct pci_dev *dev;
  89
  90         list_for_each_entry(dev, &bus->devices, bus_list) {
  91                 /*
  92                  * Skip already-present devices (which are on the
  93                  * global device list.)
  94                  */
  95                 if (list_empty(&dev->global_list)) {
  96                         int i;
  97
  98                         /* Fill device archdata and setup iommu table */
  99                         pcibios_setup_new_device(dev);
 100
 101                         pci_read_irq_line(dev);
 102                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 103                                 struct resource *r = &dev->resource[i];
 104
 105                                 if (r->parent || !r->start || !r->flags)
 106                                         continue;
 107                                 pci_claim_resource(dev, i);
 108                         }
 109                 }
 110         }
 111 }
 112 EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
 113
 114 static int
 115 pcibios_pci_config_bridge(struct pci_dev *dev)
 116 {
 117         u8 sec_busno;
 118         struct pci_bus *child_bus;
 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
 133         /* Fixup new pci devices */
 134         pcibios_fixup_new_pci_devices(child_bus);
 135
 136         /* Make the discovered devices available */
 137         pci_bus_add_devices(child_bus);
 138
 139         eeh_add_device_tree_late(child_bus);
 140         return 0;
 141 }
 142
 143 /**
 144  * pcibios_add_pci_devices - adds new pci devices to bus
 145  *
 146  * This routine will find and fixup new pci devices under
 147  * the indicated bus. This routine presumes that there
 148  * might already be some devices under this bridge, so
 149  * it carefully tries to add only new devices.  (And that
 150  * is how this routine differs from other, similar pcibios
 151  * routines.)
 152  */
 153 void
 154 pcibios_add_pci_devices(struct pci_bus * bus)
 155 {
 156         int slotno, num, mode;
 157         struct pci_dev *dev;
 158         struct device_node *dn = pci_bus_to_OF_node(bus);
 159
 160         eeh_add_device_tree_early(dn);
 161
 162         mode = PCI_PROBE_NORMAL;
 163         if (ppc_md.pci_probe_mode)
 164                 mode = ppc_md.pci_probe_mode(bus);
 165
 166         if (mode == PCI_PROBE_DEVTREE) {
 167                 /* use ofdt-based probe */
 168                 of_scan_bus(dn, bus);
 169                 if (!list_empty(&bus->devices)) {
 170                         pcibios_fixup_new_pci_devices(bus);
 171                         pci_bus_add_devices(bus);
 172                         eeh_add_device_tree_late(bus);
 173                 }
 174         } else if (mode == PCI_PROBE_NORMAL) {
 175                 /* use legacy probe */
 176                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 177                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
 178                 if (num) {
 179                         pcibios_fixup_new_pci_devices(bus);
 180                         pci_bus_add_devices(bus);
 181                         eeh_add_device_tree_late(bus);
 182                 }
 183
 184                 list_for_each_entry(dev, &bus->devices, bus_list)
 185                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 186                                 pcibios_pci_config_bridge(dev);
 187         }
 188 }
 189 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
 190
 191 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 192 {
 193         struct pci_controller *phb;
 194         int primary;
 195
 196         primary = list_empty(&hose_list);
 197         phb = pcibios_alloc_controller(dn);
 198         if (!phb)
 199                 return NULL;
 200         rtas_setup_phb(phb);
 201         pci_process_bridge_OF_ranges(phb, dn, 0);
 202
 203         pci_devs_phb_init_dynamic(phb);
 204
 205         if (dn->child)
 206                 eeh_add_device_tree_early(dn);
 207
 208         scan_phb(phb);
 209         pcibios_fixup_new_pci_devices(phb->bus);
 210         pci_bus_add_devices(phb->bus);
 211         eeh_add_device_tree_late(phb->bus);
 212
 213         return phb;
 214 }
 215 EXPORT_SYMBOL_GPL(init_phb_dynamic);