release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/pci/hotplug/shpchp_pci.c

   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
  37 int __ref shpchp_configure_device(struct slot *p_slot)
  38 {
  39         struct pci_dev *dev;
  40         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
  41         int num, fn;
  42         struct controller *ctrl = p_slot->ctrl;
  43
  44         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
  45         if (dev) {
  46                 ctrl_err(ctrl, "Device %s already exists "
  47                          "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev),
  48                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
  49                 pci_dev_put(dev);
  50                 return -EINVAL;
  51         }
  52
  53         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
  54         if (num == 0) {
  55                 ctrl_err(ctrl, "No new device found\n");
  56                 return -ENODEV;
  57         }
  58
  59         for (fn = 0; fn < 8; fn++) {
  60                 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
  61                 if (!dev)
  62                         continue;
  63                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
  64                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
  65                         /* Find an unused bus number for the new bridge */
  66                         struct pci_bus *child;
  67                         unsigned char busnr, start = parent->secondary;
  68                         unsigned char end = parent->subordinate;
  69                         for (busnr = start; busnr <= end; busnr++) {
  70                                 if (!pci_find_bus(pci_domain_nr(parent),
  71                                                         busnr))
  72                                         break;
  73                         }
  74                         if (busnr > end) {
  75                                 ctrl_err(ctrl,
  76                                          "No free bus for hot-added bridge\n");
  77                                 pci_dev_put(dev);
  78                                 continue;
  79                         }
  80                         child = pci_add_new_bus(parent, dev, busnr);
  81                         if (!child) {
  82                                 ctrl_err(ctrl, "Cannot add new bus for %s\n",
  83                                          pci_name(dev));
  84                                 pci_dev_put(dev);
  85                                 continue;
  86                         }
  87                         child->subordinate = pci_do_scan_bus(child);
  88                         pci_bus_size_bridges(child);
  89                 }
  90                 pci_configure_slot(dev);
  91                 pci_dev_put(dev);
  92         }
  93
  94         pci_bus_assign_resources(parent);
  95         pci_bus_add_devices(parent);
  96         pci_enable_bridges(parent);
  97         return 0;
  98 }
  99
 100 int shpchp_unconfigure_device(struct slot *p_slot)
 101 {
 102         int rc = 0;
 103         int j;
 104         u8 bctl = 0;
 105         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 106         struct controller *ctrl = p_slot->ctrl;
 107
 108         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
 109                  __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
 110
 111         for (j = 0; j < 8 ; j++) {
 112                 struct pci_dev *temp = pci_get_slot(parent,
 113                                 (p_slot->device << 3) | j);
 114                 if (!temp)
 115                         continue;
 116                 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 117                         pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
 118                         if (bctl & PCI_BRIDGE_CTL_VGA) {
 119                                 ctrl_err(ctrl,
 120                                          "Cannot remove display device %s\n",
 121                                          pci_name(temp));
 122                                 pci_dev_put(temp);
 123                                 rc = -EINVAL;
 124                                 break;
 125                         }
 126                 }
 127                 pci_remove_bus_device(temp);
 128                 pci_dev_put(temp);
 129         }
 130         return rc;
 131 }