2 * PCI Express Hot Plug Controller Driver
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
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.
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
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.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
30 #include <linux/config.h>
31 #include <linux/module.h>
32 #include <linux/kernel.h>
33 #include <linux/types.h>
34 #include <linux/slab.h>
35 #include <linux/workqueue.h>
36 #include <linux/proc_fs.h>
37 #include <linux/pci.h>
42 int pciehp_configure_device(struct slot *p_slot)
45 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
48 dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0));
50 err("Device %s already exists at %x:%x, cannot hot-add\n",
51 pci_name(dev), p_slot->bus, p_slot->device);
55 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
57 err("No new device found\n");
61 for (fn = 0; fn < 8; fn++) {
62 if (!(dev = pci_find_slot(p_slot->bus,
63 PCI_DEVFN(p_slot->device, fn))))
65 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
66 err("Cannot hot-add display device %s\n",
70 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
71 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
72 /* Find an unused bus number for the new bridge */
73 struct pci_bus *child;
74 unsigned char busnr, start = parent->secondary;
75 unsigned char end = parent->subordinate;
76 for (busnr = start; busnr <= end; busnr++) {
77 if (!pci_find_bus(pci_domain_nr(parent),
82 err("No free bus for hot-added bridge\n");
85 child = pci_add_new_bus(parent, dev, busnr);
87 err("Cannot add new bus for %s\n",
91 child->subordinate = pci_do_scan_bus(child);
92 pci_bus_size_bridges(child);
94 /* TBD: program firmware provided _HPP values */
95 /* program_fw_provided_values(dev); */
98 pci_bus_assign_resources(parent);
99 pci_bus_add_devices(parent);
100 pci_enable_bridges(parent);
104 int pciehp_unconfigure_device(struct slot *p_slot)
110 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus,
113 for (j=0; j<8 ; j++) {
114 struct pci_dev* temp = pci_find_slot(p_slot->bus,
115 (p_slot->device << 3) | j);
118 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
119 err("Cannot remove display device %s\n",
123 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
124 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
125 if (bctl & PCI_BRIDGE_CTL_VGA) {
126 err("Cannot remove display device %s\n",
131 pci_remove_bus_device(temp);
134 * Some PCI Express root ports require fixup after hot-plug operation.
137 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev);