LXR linux/drivers/pci/hotplug/shpchp

   1/*
   2 * Standard Hot Plug Controller Driver
   3 *
   4 * Copyright (C) 1995,2001 Compaq Computer Corporation
   5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
   6 * Copyright (C) 2001 IBM Corp.
   7 * Copyright (C) 2003-2004 Intel Corporation
   8 *
   9 * All rights reserved.
  10 *
  11 * This program is free software; you can redistribute it and/or modify
  12 * it under the terms of the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2 of the License, or (at
  14 * your option) any later version.
  15 *
  16 * This program is distributed in the hope that it will be useful, but
  17 * WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19 * NON INFRINGEMENT.  See the GNU General Public License for more
  20 * details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with this program; if not, write to the Free Software
  24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25 *
  26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
  27 *
  28 */
  29
  30#include <linux/module.h>
  31#include <linux/kernel.h>
  32#include <linux/types.h>
  33#include <linux/pci.h>
  34#include "../pci.h"
  35#include "shpchp.h"
  36
  37int shpchp_configure_device(struct slot *p_slot)
  38{
  39        struct pci_dev *dev;
  40        struct controller *ctrl = p_slot->ctrl;
  41        struct pci_dev *bridge = ctrl->pci_dev;
  42        struct pci_bus *parent = bridge->subordinate;
  43        int num, ret = 0;
  44
  45        pci_lock_rescan_remove();
  46
  47        dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
  48        if (dev) {
  49                ctrl_err(ctrl, "Device %s already exists at %04x:%02x:%02x, cannot hot-add\n",
  50                         pci_name(dev), pci_domain_nr(parent),
  51                         p_slot->bus, p_slot->device);
  52                pci_dev_put(dev);
  53                ret = -EINVAL;
  54                goto out;
  55        }
  56
  57        num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
  58        if (num == 0) {
  59                ctrl_err(ctrl, "No new device found\n");
  60                ret = -ENODEV;
  61                goto out;
  62        }
  63
  64        list_for_each_entry(dev, &parent->devices, bus_list) {
  65                if (PCI_SLOT(dev->devfn) != p_slot->device)
  66                        continue;
  67                if (pci_is_bridge(dev))
  68                        pci_hp_add_bridge(dev);
  69        }
  70
  71        pci_assign_unassigned_bridge_resources(bridge);
  72
  73        list_for_each_entry(dev, &parent->devices, bus_list) {
  74                if (PCI_SLOT(dev->devfn) != p_slot->device)
  75                        continue;
  76                pci_configure_slot(dev);
  77        }
  78
  79        pci_bus_add_devices(parent);
  80
  81 out:
  82        pci_unlock_rescan_remove();
  83        return ret;
  84}
  85
  86int shpchp_unconfigure_device(struct slot *p_slot)
  87{
  88        int rc = 0;
  89        u8 bctl = 0;
  90        struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
  91        struct pci_dev *dev, *temp;
  92        struct controller *ctrl = p_slot->ctrl;
  93
  94        ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
  95                 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
  96
  97        pci_lock_rescan_remove();
  98
  99        list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
 100                if (PCI_SLOT(dev->devfn) != p_slot->device)
 101                        continue;
 102
 103                pci_dev_get(dev);
 104                if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 105                        pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
 106                        if (bctl & PCI_BRIDGE_CTL_VGA) {
 107                                ctrl_err(ctrl,
 108                                         "Cannot remove display device %s\n",
 109                                         pci_name(dev));
 110                                pci_dev_put(dev);
 111                                rc = -EINVAL;
 112                                break;
 113                        }
 114                }
 115                pci_stop_and_remove_bus_device(dev);
 116                pci_dev_put(dev);
 117        }
 118
 119        pci_unlock_rescan_remove();
 120        return rc;
 121}
 122
 123