linux/drivers/pci/hotplug/shpchp_pci.c
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   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 __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
 100int 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}
 132
 133