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
  32 static struct pci_bus *
  33 find_bus_among_children(struct pci_bus *bus,
  34                         struct device_node *dn)
  35 {
  36         struct pci_bus *child = NULL;
  37         struct list_head *tmp;
  38         struct device_node *busdn;
  39
  40         busdn = pci_bus_to_OF_node(bus);
  41         if (busdn == dn)
  42                 return bus;
  43
  44         list_for_each(tmp, &bus->children) {
  45                 child = find_bus_among_children(pci_bus_b(tmp), dn);
  46                 if (child)
  47                         break;
  48         };
  49         return child;
  50 }
  51
  52 struct pci_bus *
  53 pcibios_find_pci_bus(struct device_node *dn)
  54 {
  55         struct pci_dn *pdn = dn->data;
  56
  57         if (!pdn  || !pdn->phb || !pdn->phb->bus)
  58                 return NULL;
  59
  60         return find_bus_among_children(pdn->phb->bus, dn);
  61 }
  62 EXPORT_SYMBOL_GPL(pcibios_find_pci_bus);
  63
  64 /**
  65  * pcibios_remove_pci_devices - remove all devices under this bus
  66  *
  67  * Remove all of the PCI devices under this bus both from the
  68  * linux pci device tree, and from the powerpc EEH address cache.
  69  */
  70 void
  71 pcibios_remove_pci_devices(struct pci_bus *bus)
  72 {
  73         struct pci_dev *dev, *tmp;
  74
  75         list_for_each_entry_safe(dev, tmp, &bus->devices, bus_list) {
  76                 eeh_remove_bus_device(dev);
  77                 pci_remove_bus_device(dev);
  78         }
  79 }
  80
  81 /* Must be called before pci_bus_add_devices */
  82 void
  83 pcibios_fixup_new_pci_devices(struct pci_bus *bus, int fix_bus)
  84 {
  85         struct pci_dev *dev;
  86
  87         list_for_each_entry(dev, &bus->devices, bus_list) {
  88                 /*
  89                  * Skip already-present devices (which are on the
  90                  * global device list.)
  91                  */
  92                 if (list_empty(&dev->global_list)) {
  93                         int i;
  94
  95                         /* Need to setup IOMMU tables */
  96                         ppc_md.iommu_dev_setup(dev);
  97
  98                         if(fix_bus)
  99                                 pcibios_fixup_device_resources(dev, bus);
 100                         pci_read_irq_line(dev);
 101                         for (i = 0; i < PCI_NUM_RESOURCES; i++) {
 102                                 struct resource *r = &dev->resource[i];
 103
 104                                 if (r->parent || !r->start || !r->flags)
 105                                         continue;
 106                                 pci_claim_resource(dev, i);
 107                         }
 108                 }
 109         }
 110
 111         eeh_add_device_tree_late(bus);
 112 }
 113 EXPORT_SYMBOL_GPL(pcibios_fixup_new_pci_devices);
 114
 115 static int
 116 pcibios_pci_config_bridge(struct pci_dev *dev)
 117 {
 118         u8 sec_busno;
 119         struct pci_bus *child_bus;
 120
 121         /* Get busno of downstream bus */
 122         pci_read_config_byte(dev, PCI_SECONDARY_BUS, &sec_busno);
 123
 124         /* Add to children of PCI bridge dev->bus */
 125         child_bus = pci_add_new_bus(dev->bus, dev, sec_busno);
 126         if (!child_bus) {
 127                 printk (KERN_ERR "%s: could not add second bus\n", __FUNCTION__);
 128                 return -EIO;
 129         }
 130         sprintf(child_bus->name, "PCI Bus #%02x", child_bus->number);
 131
 132         pci_scan_child_bus(child_bus);
 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         if (_machine == PLATFORM_PSERIES_LPAR) {
 162                 /* use ofdt-based probe */
 163                 of_scan_bus(dn, bus);
 164                 if (!list_empty(&bus->devices)) {
 165                         pcibios_fixup_new_pci_devices(bus, 0);
 166                         pci_bus_add_devices(bus);
 167                 }
 168         } else {
 169                 /* use legacy probe */
 170                 slotno = PCI_SLOT(PCI_DN(dn->child)->devfn);
 171                 num = pci_scan_slot(bus, PCI_DEVFN(slotno, 0));
 172                 if (num) {
 173                         pcibios_fixup_new_pci_devices(bus, 1);
 174                         pci_bus_add_devices(bus);
 175                 }
 176
 177                 list_for_each_entry(dev, &bus->devices, bus_list)
 178                         if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
 179                                 pcibios_pci_config_bridge(dev);
 180         }
 181 }
 182 EXPORT_SYMBOL_GPL(pcibios_add_pci_devices);
 183
 184 struct pci_controller * __devinit init_phb_dynamic(struct device_node *dn)
 185 {
 186         struct pci_controller *phb;
 187         int primary;
 188
 189         primary = list_empty(&hose_list);
 190         phb = pcibios_alloc_controller(dn);
 191         if (!phb)
 192                 return NULL;
 193         setup_phb(dn, phb);
 194         pci_process_bridge_OF_ranges(phb, dn, 0);
 195
 196         pci_setup_phb_io_dynamic(phb, primary);
 197
 198         pci_devs_phb_init_dynamic(phb);
 199
 200         if (dn->child)
 201                 eeh_add_device_tree_early(dn);
 202
 203         scan_phb(phb);
 204         pcibios_fixup_new_pci_devices(phb->bus, 0);
 205         pci_bus_add_devices(phb->bus);
 206
 207         return phb;
 208 }
 209 EXPORT_SYMBOL_GPL(init_phb_dynamic);