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 __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->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
  64                        ctrl_err(ctrl, "Cannot hot-add display device %s\n",
  65                                 pci_name(dev));
  66                        pci_dev_put(dev);
  67                        continue;
  68                }
  69                if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
  70                                (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
  71                        /* Find an unused bus number for the new bridge */
  72                        struct pci_bus *child;
  73                        unsigned char busnr, start = parent->secondary;
  74                        unsigned char end = parent->subordinate;
  75                        for (busnr = start; busnr <= end; busnr++) {
  76                                if (!pci_find_bus(pci_domain_nr(parent),
  77                                                        busnr))
  78                                        break;
  79                        }
  80                        if (busnr > end) {
  81                                ctrl_err(ctrl,
  82                                         "No free bus for hot-added bridge\n");
  83                                pci_dev_put(dev);
  84                                continue;
  85                        }
  86                        child = pci_add_new_bus(parent, dev, busnr);
  87                        if (!child) {
  88                                ctrl_err(ctrl, "Cannot add new bus for %s\n",
  89                                         pci_name(dev));
  90                                pci_dev_put(dev);
  91                                continue;
  92                        }
  93                        child->subordinate = pci_do_scan_bus(child);
  94                        pci_bus_size_bridges(child);
  95                }
  96                pci_configure_slot(dev);
  97                pci_dev_put(dev);
  98        }
  99
 100        pci_bus_assign_resources(parent);
 101        pci_bus_add_devices(parent);
 102        pci_enable_bridges(parent);
 103        return 0;
 104}
 105
 106int shpchp_unconfigure_device(struct slot *p_slot)
 107{
 108        int rc = 0;
 109        int j;
 110        u8 bctl = 0;
 111        struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
 112        struct controller *ctrl = p_slot->ctrl;
 113
 114        ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
 115                 __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
 116
 117        for (j=0; j<8 ; j++) {
 118                struct pci_dev* temp = pci_get_slot(parent,
 119                                (p_slot->device << 3) | j);
 120                if (!temp)
 121                        continue;
 122                if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 123                        ctrl_err(ctrl, "Cannot remove display device %s\n",
 124                                 pci_name(temp));
 125                        pci_dev_put(temp);
 126                        continue;
 127                }
 128                if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
 129                        pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
 130                        if (bctl & PCI_BRIDGE_CTL_VGA) {
 131                                ctrl_err(ctrl,
 132                                         "Cannot remove display device %s\n",
 133                                         pci_name(temp));
 134                                pci_dev_put(temp);
 135                                continue;
 136                        }
 137                }
 138                pci_remove_bus_device(temp);
 139                pci_dev_put(temp);
 140        }
 141        return rc;
 142}
 143
 144