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
pciehp_add_bridge(struct pci_dev * dev)37 static int __ref 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
57 return 0;
58 }
59
pciehp_configure_device(struct slot * p_slot)60 int pciehp_configure_device(struct slot *p_slot)
61 {
62 struct pci_dev *dev;
63 struct pci_dev *bridge = p_slot->ctrl->pcie->port;
64 struct pci_bus *parent = bridge->subordinate;
65 int num, fn;
66 struct controller *ctrl = p_slot->ctrl;
67
68 dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
69 if (dev) {
70 ctrl_err(ctrl, "Device %s already exists "
71 "at %04x:%02x:00, cannot hot-add\n", pci_name(dev),
72 pci_domain_nr(parent), parent->number);
73 pci_dev_put(dev);
74 return -EINVAL;
75 }
76
77 num = pci_scan_slot(parent, PCI_DEVFN(0, 0));
78 if (num == 0) {
79 ctrl_err(ctrl, "No new device found\n");
80 return -ENODEV;
81 }
82
83 for (fn = 0; fn < 8; fn++) {
84 dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
85 if (!dev)
86 continue;
87 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
88 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
89 pciehp_add_bridge(dev);
90 }
91 pci_dev_put(dev);
92 }
93
94 pci_assign_unassigned_bridge_resources(bridge);
95
96 for (fn = 0; fn < 8; fn++) {
97 dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
98 if (!dev)
99 continue;
100 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
101 pci_dev_put(dev);
102 continue;
103 }
104 pci_configure_slot(dev);
105 pci_dev_put(dev);
106 }
107
108 pci_bus_add_devices(parent);
109
110 return 0;
111 }
112
pciehp_unconfigure_device(struct slot * p_slot)113 int pciehp_unconfigure_device(struct slot *p_slot)
114 {
115 int ret, rc = 0;
116 int j;
117 u8 bctl = 0;
118 u8 presence = 0;
119 struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
120 u16 command;
121 struct controller *ctrl = p_slot->ctrl;
122
123 ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:00\n",
124 __func__, pci_domain_nr(parent), parent->number);
125 ret = pciehp_get_adapter_status(p_slot, &presence);
126 if (ret)
127 presence = 0;
128
129 for (j = 0; j < 8; j++) {
130 struct pci_dev *temp = pci_get_slot(parent, PCI_DEVFN(0, j));
131 if (!temp)
132 continue;
133 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE && presence) {
134 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
135 if (bctl & PCI_BRIDGE_CTL_VGA) {
136 ctrl_err(ctrl,
137 "Cannot remove display device %s\n",
138 pci_name(temp));
139 pci_dev_put(temp);
140 rc = -EINVAL;
141 break;
142 }
143 }
144 pci_stop_and_remove_bus_device(temp);
145 /*
146 * Ensure that no new Requests will be generated from
147 * the device.
148 */
149 if (presence) {
150 pci_read_config_word(temp, PCI_COMMAND, &command);
151 command &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_SERR);
152 command |= PCI_COMMAND_INTX_DISABLE;
153 pci_write_config_word(temp, PCI_COMMAND, command);
154 }
155 pci_dev_put(temp);
156 }
157
158 return rc;
159 }
160