PCI: PCIe: Ask BIOS for control of all native services at once
[linux-2.6.git] / drivers / pci / hotplug / pciehp_pci.c
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
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
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
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_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 }