linux/drivers/pci/hotplug/pciehp_pci.c
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   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
  37static int __ref pciehp_add_bridge(struct pci_dev *dev)
  38{
  39        struct pci_bus *parent = dev->bus;
  40        int pass, busnr, start = parent->secondary;
  41        int end = parent->subordinate;
  42
  43        for (busnr = start; busnr <= end; busnr++) {
  44                if (!pci_find_bus(pci_domain_nr(parent), busnr))
  45                        break;
  46        }
  47        if (busnr-- > end) {
  48                err("No bus number available for hot-added bridge %s\n",
  49                                pci_name(dev));
  50                return -1;
  51        }
  52        for (pass = 0; pass < 2; pass++)
  53                busnr = pci_scan_bridge(parent, dev, busnr, pass);
  54        if (!dev->subordinate)
  55                return -1;
  56
  57        return 0;
  58}
  59
  60int pciehp_configure_device(struct slot *p_slot)
  61{
  62        struct pci_dev *dev;
  63        struct pci_dev *bridge = p_slot->ctrl->pcie->port;
  64        struct pci_bus *parent = bridge->subordinate;
  65        int num, fn;
  66        struct controller *ctrl = p_slot->ctrl;
  67
  68        dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
  69        if (dev) {
  70                ctrl_err(ctrl, "Device %s already exists "
  71                         "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
  72                         pci_domain_nr(parent), parent->number);
  73                pci_dev_put(dev);
  74                return -EINVAL;
  75        }
  76
  77        num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
  78        if (num == 0) {
  79                ctrl_err(ctrl, "No new device found\n");
  80                return -ENODEV;
  81        }
  82
  83        for (fn = 0; fn < 8; fn++) {
  84                dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
  85                if (!dev)
  86                        continue;
  87                if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
  88                                (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
  89                        pciehp_add_bridge(dev);
  90                }
  91                pci_dev_put(dev);
  92        }
  93
  94        pci_assign_unassigned_bridge_resources(bridge);
  95
  96        for (fn = 0; fn < 8; fn++) {
  97                dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
  98                if (!dev)
  99                        continue;
 100                if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 101                        pci_dev_put(dev);
 102                        continue;
 103                }
 104                pci_configure_slot(dev);
 105                pci_dev_put(dev);
 106        }
 107
 108        pci_bus_add_devices(parent);
 109
 110        return 0;
 111}
 112
 113int pciehp_unconfigure_device(struct slot *p_slot)
 114{
 115        int ret, rc = 0;
 116        int j;
 117        u8 bctl = 0;
 118        u8 presence = 0;
 119        struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
 120        u16 command;
 121        struct controller *ctrl = p_slot->ctrl;
 122
 123        ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
 124                 __func__, pci_domain_nr(parent), parent->number);
 125        ret = pciehp_get_adapter_status(p_slot, &presence);
 126        if (ret)
 127                presence = 0;
 128
 129        for (j = 0; j < 8; j++) {
 130                struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j));
 131                if (!temp)
 132                        continue;
 133                if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
 134                        pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
 135                        if (bctl & PCI_BRIDGE_CTL_VGA) {
 136                                ctrl_err(ctrl,
 137                                         "Cannot remove display device %s\n",
 138                                         pci_name(temp));
 139                                pci_dev_put(temp);
 140                                rc = -EINVAL;
 141                                break;
 142                        }
 143                }
 144                pci_remove_bus_device(temp);
 145                /*
 146                 * Ensure that no new Requests will be generated from
 147                 * the device.
 148                 */
 149                if (presence) {
 150                        pci_read_config_word(temp, PCI_COMMAND, &command);
 151                        command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
 152                        command |= PCI_COMMAND_INTX_DISABLE;
 153                        pci_write_config_word(temp, PCI_COMMAND, command);
 154                }
 155                pci_dev_put(temp);
 156        }
 157
 158        return rc;
 159}
 160