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 <linux/export.h>
  30 #include <asm/pci-bridge.h>
  31 #include <asm/ppc-pci.h>
  32 #include <asm/firmware.h>
  33 #include <asm/eeh.h>
  34
  35 #include "pseries.h"
  36
  37 struct pci_controller *init_phb_dynamic(struct device_node *dn)
  38 {
  39         struct pci_controller *phb;
  40
  41         pr_debug("PCI: Initializing new hotplug PHB %pOF\n", dn);
  42
  43         phb = pcibios_alloc_controller(dn);
  44         if (!phb)
  45                 return NULL;
  46         rtas_setup_phb(phb);
  47         pci_process_bridge_OF_ranges(phb, dn, 0);
  48         phb->controller_ops = pseries_pci_controller_ops;
  49
  50         pci_devs_phb_init_dynamic(phb);
  51
  52         /* Create EEH devices for the PHB */
  53         eeh_dev_phb_init_dynamic(phb);
  54
  55         if (dn->child)
  56                 eeh_add_device_tree_early(PCI_DN(dn));
  57
  58         pcibios_scan_phb(phb);
  59         pcibios_finish_adding_to_bus(phb->bus);
  60
  61         return phb;
  62 }
  63 EXPORT_SYMBOL_GPL(init_phb_dynamic);
  64
  65 /* RPA-specific bits for removing PHBs */
  66 int remove_phb_dynamic(struct pci_controller *phb)
  67 {
  68         struct pci_bus *b = phb->bus;
  69         struct resource *res;
  70         int rc, i;
  71
  72         pr_debug("PCI: Removing PHB %04x:%02x...\n",
  73                  pci_domain_nr(b), b->number);
  74
  75         /* We cannot to remove a root bus that has children */
  76         if (!(list_empty(&b->children) && list_empty(&b->devices)))
  77                 return -EBUSY;
  78
  79         /* We -know- there aren't any child devices anymore at this stage
  80          * and thus, we can safely unmap the IO space as it's not in use
  81          */
  82         res = &phb->io_resource;
  83         if (res->flags & IORESOURCE_IO) {
  84                 rc = pcibios_unmap_io_space(b);
  85                 if (rc) {
  86                         printk(KERN_ERR "%s: failed to unmap IO on bus %s\n",
  87                                __func__, b->name);
  88                         return 1;
  89                 }
  90         }
  91
  92         /* Remove the PCI bus and unregister the bridge device from sysfs */
  93         phb->bus = NULL;
  94         pci_remove_bus(b);
  95         device_unregister(b->bridge);
  96
  97         /* Now release the IO resource */
  98         if (res->flags & IORESOURCE_IO)
  99                 release_resource(res);
 100
 101         /* Release memory resources */
 102         for (i = 0; i < 3; ++i) {
 103                 res = &phb->mem_resources[i];
 104                 if (!(res->flags & IORESOURCE_MEM))
 105                         continue;
 106                 release_resource(res);
 107         }
 108
 109         /*
 110          * The pci_controller data structure is freed by
 111          * the pcibios_free_controller_deferred() callback;
 112          * see pseries_root_bridge_prepare().
 113          */
 114
 115         return 0;
 116 }
 117 EXPORT_SYMBOL_GPL(remove_phb_dynamic);