LXR linux/arch/powerpc/platforms/pseries/pci

   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
  37struct 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}
  63EXPORT_SYMBOL_GPL(init_phb_dynamic);
  64
  65/* RPA-specific bits for removing PHBs */
  66int 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}
 117EXPORT_SYMBOL_GPL(remove_phb_dynamic);
 118