drivers/pci/hotplug/pciehp_pci.c

   1 /*
   2  * PCI Express 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 "pciehp.h"
  36
  37 int pciehp_configure_device(struct slot *p_slot)
  38 {
  39         struct pci_dev *dev;
  40         struct pci_dev *bridge = p_slot->ctrl->pcie->port;
  41         struct pci_bus *parent = bridge->subordinate;
  42         int num;
  43         struct controller *ctrl = p_slot->ctrl;
  44
  45         dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
  46         if (dev) {
  47                 ctrl_err(ctrl, "Device %s already exists "
  48                          "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
  49                          pci_domain_nr(parent), parent->number);
  50                 pci_dev_put(dev);
  51                 return -EINVAL;
  52         }
  53
  54         num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
  55         if (num == 0) {
  56                 ctrl_err(ctrl, "No new device found\n");
  57                 return -ENODEV;
  58         }
  59
  60         list_for_each_entry(dev, &parent->devices, bus_list)
  61                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
  62                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS))
  63                         pci_hp_add_bridge(dev);
  64
  65         pci_assign_unassigned_bridge_resources(bridge);
  66
  67         list_for_each_entry(dev, &parent->devices, bus_list) {
  68                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY)
  69                         continue;
  70
  71                 pci_configure_slot(dev);
  72         }
  73
  74         pci_bus_add_devices(parent);
  75
  76         return 0;
  77 }
  78
  79 int pciehp_unconfigure_device(struct slot *p_slot)
  80 {
  81         int ret, rc = 0;
  82         u8 bctl = 0;
  83         u8 presence = 0;
  84         struct pci_dev *dev, *temp;
  85         struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
  86         u16 command;
  87         struct controller *ctrl = p_slot->ctrl;
  88
  89         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
  90                  __func__, pci_domain_nr(parent), parent->number);
  91         ret = pciehp_get_adapter_status(p_slot, &presence);
  92         if (ret)
  93                 presence = 0;
  94
  95         list_for_each_entry_safe(dev, temp, &parent->devices, bus_list) {
  96                 pci_dev_get(dev);
  97                 if (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
  98                         pci_read_config_byte(dev, PCI_BRIDGE_CONTROL, &bctl);
  99                         if (bctl & PCI_BRIDGE_CTL_VGA) {
 100                                 ctrl_err(ctrl,
 101                                          "Cannot remove display device %s\n",
 102                                          pci_name(dev));
 103                                 pci_dev_put(dev);
 104                                 rc = -EINVAL;
 105                                 break;
 106                         }
 107                 }
 108                 pci_stop_and_remove_bus_device(dev);
 109                 /*
 110                  * Ensure that no new Requests will be generated from
 111                  * the device.
 112                  */
 113                 if (presence) {
 114                         pci_read_config_word(dev, PCI_COMMAND, &command);
 115                         command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
 116                         command |= PCI_COMMAND_INTX_DISABLE;
 117                         pci_write_config_word(dev, PCI_COMMAND, command);
 118                 }
 119                 pci_dev_put(dev);
 120         }
 121
 122         return rc;
 123 }