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/module.h>
31 #include <linux/kernel.h>
32 #include <linux/types.h>
33 #include <linux/pci.h>
37 static int pciehp_add_bridge(struct pci_dev *dev)
39 struct pci_bus *parent = dev->bus;
40 int pass, busnr, start = parent->secondary;
41 int end = parent->subordinate;
43 for (busnr = start; busnr <= end; busnr++) {
44 if (!pci_find_bus(pci_domain_nr(parent), busnr))
48 err("No bus number available for hot-added bridge %s\n",
52 for (pass = 0; pass < 2; pass++)
53 busnr = pci_scan_bridge(parent, dev, busnr, pass);
54 if (!dev->subordinate)
56 pci_bus_size_bridges(dev->subordinate);
57 pci_bus_assign_resources(parent);
58 pci_enable_bridges(parent);
59 pci_bus_add_devices(parent);
63 int pciehp_configure_device(struct slot *p_slot)
66 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
69 dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0));
71 err("Device %s already exists at %x:%x, cannot hot-add\n",
72 pci_name(dev), p_slot->bus, p_slot->device);
76 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
78 err("No new device found\n");
82 for (fn = 0; fn < 8; fn++) {
83 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
86 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
87 err("Cannot hot-add display device %s\n",
91 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
92 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
93 pciehp_add_bridge(dev);
95 /* TBD: program firmware provided _HPP values */
96 /* program_fw_provided_values(dev); */
99 pci_bus_assign_resources(parent);
100 pci_bus_add_devices(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);