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, int fix_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                         if(fix_bus)
 102                                 pcibios_fixup_device_resources(dev, bus);
 103                         pci_read_irq_line(dev);
 104                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 105                                 struct resource *r = &dev->resource[i];
 106
 107                                 if (r->parent || !r->start || !r->flags)
 108                                         continue;
 109                                 pci_claim_resource(dev, i);
 110                         }
 111                 }
 112         }
 113 }
 114 EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
 115
 116 static int
 117 pcibios_pci_config_bridge(struct pci_dev *dev)
 118 {
 119         u8 sec_busno;
 120         struct pci_bus *child_bus;
 121
 122         /* Get busno of downstream bus */
 123         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 124
 125         /* Add to children of PCI bridge dev->bus */
 126         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 127         if (!child_bus) {
 128                 printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
 129                 return -EIO;
 130         }
 131         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 132
 133         pci_scan_child_bus(child_bus);
 134
 135         /* Fixup new pci devices without touching bus struct */
 136         pcibios_fixup_new_pci_devices(child_bus, 0);
 137
 138         /* Make the discovered devices available */
 139         pci_bus_add_devices(child_bus);
 140
 141         eeh_add_device_tree_late(child_bus);
 142         return 0;
 143 }
 144
 145 /**
 146  * pcibios_add_pci_devices - adds new pci devices to bus
 147  *
 148  * This routine will find and fixup new pci devices under
 149  * the indicated bus. This routine presumes that there
 150  * might already be some devices under this bridge, so
 151  * it carefully tries to add only new devices.  (And that
 152  * is how this routine differs from other, similar pcibios
 153  * routines.)
 154  */
 155 void
 156 pcibios_add_pci_devices(struct pci_bus * bus)
 157 {
 158         int slotno, num, mode;
 159         struct pci_dev *dev;
 160         struct device_node *dn = pci_bus_to_OF_node(bus);
 161
 162         eeh_add_device_tree_early(dn);
 163
 164         mode = PCI_PROBE_NORMAL;
 165         if (ppc_md.pci_probe_mode)
 166                 mode = ppc_md.pci_probe_mode(bus);
 167
 168         if (mode == PCI_PROBE_DEVTREE) {
 169                 /* use ofdt-based probe */
 170                 of_scan_bus(dn, bus);
 171                 if (!list_empty(&bus->devices)) {
 172                         pcibios_fixup_new_pci_devices(bus, 0);
 173                         pci_bus_add_devices(bus);
 174                         eeh_add_device_tree_late(bus);
 175                 }
 176         } else if (mode == PCI_PROBE_NORMAL) {
 177                 /* use legacy probe */
 178                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 179                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
 180                 if (num) {
 181                         pcibios_fixup_new_pci_devices(bus, 1);
 182                         pci_bus_add_devices(bus);
 183                         eeh_add_device_tree_late(bus);
 184                 }
 185
 186                 list_for_each_entry(dev, &bus->devices, bus_list)
 187                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 188                                 pcibios_pci_config_bridge(dev);
 189         }
 190 }
 191 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
 192
 193 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 194 {
 195         struct pci_controller *phb;
 196         int primary;
 197
 198         primary = list_empty(&hose_list);
 199         phb = pcibios_alloc_controller(dn);
 200         if (!phb)
 201                 return NULL;
 202         rtas_setup_phb(phb);
 203         pci_process_bridge_OF_ranges(phb, dn, 0);
 204
 205         pci_devs_phb_init_dynamic(phb);
 206
 207         if (dn->child)
 208                 eeh_add_device_tree_early(dn);
 209
 210         scan_phb(phb);
 211         pcibios_fixup_new_pci_devices(phb->bus, 0);
 212         pci_bus_add_devices(phb->bus);
 213         eeh_add_device_tree_late(phb->bus);
 214
 215         return phb;
 216 }
 217 EXPORT_SYMBOL_GPL(init_phb_dynamic);