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
  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 }
  61
  62 /**
  63  * pcibios_remove_pci_devices - remove all devices under this bus
  64  *
  65  * Remove all of the PCI devices under this bus both from the
  66  * linux pci device tree, and from the powerpc EEH address cache.
  67  */
  68 void
  69 pcibios_remove_pci_devices(struct pci_bus *bus)
  70 {
  71         struct pci_dev *dev, *tmp;
  72
  73         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
  74                 eeh_remove_bus_device(dev);
  75                 pci_remove_bus_device(dev);
  76         }
  77 }
  78
  79 /* Must be called before pci_bus_add_devices */
  80 void
  81 pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
  82 {
  83         struct pci_dev *dev;
  84
  85         list_for_each_entry(dev, &bus->devices, bus_list) {
  86                 /*
  87                  * Skip already-present devices (which are on the
  88                  * global device list.)
  89                  */
  90                 if (list_empty(&dev->global_list)) {
  91                         int i;
  92
  93                         /* Need to setup IOMMU tables */
  94                         ppc_md.iommu_dev_setup(dev);
  95
  96                         if(fix_bus)
  97                                 pcibios_fixup_device_resources(dev, bus);
  98                         pci_read_irq_line(dev);
  99                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 100                                 struct resource *r = &dev->resource[i];
 101
 102                                 if (r->parent || !r->start || !r->flags)
 103                                         continue;
 104                                 pci_claim_resource(dev, i);
 105                         }
 106                 }
 107         }
 108 }
 109
 110 static int
 111 pcibios_pci_config_bridge(struct pci_dev *dev)
 112 {
 113         u8 sec_busno;
 114         struct pci_bus *child_bus;
 115         struct pci_dev *child_dev;
 116
 117         /* Get busno of downstream bus */
 118         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 119
 120         /* Add to children of PCI bridge dev->bus */
 121         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 122         if (!child_bus) {
 123                 printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
 124                 return -EIO;
 125         }
 126         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 127
 128         pci_scan_child_bus(child_bus);
 129
 130         list_for_each_entry(child_dev, &child_bus->devices, bus_list) {
 131                 eeh_add_device_late(child_dev);
 132         }
 133
 134         /* Fixup new pci devices without touching bus struct */
 135         pcibios_fixup_new_pci_devices(child_bus, 0);
 136
 137         /* Make the discovered devices available */
 138         pci_bus_add_devices(child_bus);
 139         return 0;
 140 }
 141
 142 /**
 143  * pcibios_add_pci_devices - adds new pci devices to bus
 144  *
 145  * This routine will find and fixup new pci devices under
 146  * the indicated bus. This routine presumes that there
 147  * might already be some devices under this bridge, so
 148  * it carefully tries to add only new devices.  (And that
 149  * is how this routine differs from other, similar pcibios
 150  * routines.)
 151  */
 152 void
 153 pcibios_add_pci_devices(struct pci_bus * bus)
 154 {
 155         int slotno, num;
 156         struct pci_dev *dev;
 157         struct device_node *dn = pci_bus_to_OF_node(bus);
 158
 159         eeh_add_device_tree_early(dn);
 160
 161         /* pci_scan_slot should find all children */
 162         slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 163         num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
 164         if (num) {
 165                 pcibios_fixup_new_pci_devices(bus, 1);
 166                 pci_bus_add_devices(bus);
 167         }
 168
 169         list_for_each_entry(dev, &bus->devices, bus_list) {
 170                 eeh_add_device_late (dev);
 171                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 172                         pcibios_pci_config_bridge(dev);
 173         }
 174 }