tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 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 pci_bus_size_bridges(dev->subordinate);
57 pci_bus_assign_resources(parent);
58 pci_enable_bridges(parent);
59 pci_bus_add_devices(parent);
60 return 0;
61}
62
63int pciehp_configure_device(struct slot *p_slot)
64{
65 struct pci_dev *dev;
66 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
67 int num, fn;
68
69 dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0));
70 if (dev) {
71 err("Device %s already exists at %x:%x, cannot hot-add\n",
72 pci_name(dev), p_slot->bus, p_slot->device);
73 return -EINVAL;
74 }
75
76 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
77 if (num == 0) {
78 err("No new device found\n");
79 return -ENODEV;
80 }
81
82 for (fn = 0; fn < 8; fn++) {
83 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
84 if (!dev)
85 continue;
86 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
87 err("Cannot hot-add display device %s\n",
88 pci_name(dev));
89 continue;
90 }
91 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
92 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
93 pciehp_add_bridge(dev);
94 }
95 /* TBD: program firmware provided _HPP values */
96 /* program_fw_provided_values(dev); */
97 }
98
99 pci_bus_assign_resources(parent);
100 pci_bus_add_devices(parent);
101 return 0;
102}
103
104int pciehp_unconfigure_device(struct slot *p_slot)
105{
106 int rc = 0;
107 int j;
108 u8 bctl = 0;
109
110 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus,
111 p_slot->device);
112
113 for (j=0; j<8 ; j++) {
114 struct pci_dev* temp = pci_find_slot(p_slot->bus,
115 (p_slot->device << 3) | j);
116 if (!temp)
117 continue;
118 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
119 err("Cannot remove display device %s\n",
120 pci_name(temp));
121 continue;
122 }
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",
127 pci_name(temp));
128 continue;
129 }
130 }
131 pci_remove_bus_device(temp);
132 }
133 /*
134 * Some PCI Express root ports require fixup after hot-plug operation.
135 */
136 if (pcie_mch_quirk)
137 pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev);
138
139 return rc;
140}
141