PCI hotplug: shpchp: Removed check for hotplug of display devices
[linux-2.6.git] / drivers / pci / hotplug / shpchp_pci.c
1 /*
2  * Standard 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 "shpchp.h"
36
37 int __ref shpchp_configure_device(struct slot *p_slot)
38 {
39         struct pci_dev *dev;
40         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
41         int num, fn;
42         struct controller *ctrl = p_slot->ctrl;
43
44         dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
45         if (dev) {
46                 ctrl_err(ctrl, "Device %s already exists "
47                          "at %04x:%02x:%02x, cannot hot-add\n", pci_name(dev),
48                          pci_domain_nr(parent), p_slot->bus, p_slot->device);
49                 pci_dev_put(dev);
50                 return -EINVAL;
51         }
52
53         num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
54         if (num == 0) {
55                 ctrl_err(ctrl, "No new device found\n");
56                 return -ENODEV;
57         }
58
59         for (fn = 0; fn < 8; fn++) {
60                 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
61                 if (!dev)
62                         continue;
63                 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
64                                 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
65                         /* Find an unused bus number for the new bridge */
66                         struct pci_bus *child;
67                         unsigned char busnr, start = parent->secondary;
68                         unsigned char end = parent->subordinate;
69                         for (busnr = start; busnr <= end; busnr++) {
70                                 if (!pci_find_bus(pci_domain_nr(parent),
71                                                         busnr))
72                                         break;
73                         }
74                         if (busnr > end) {
75                                 ctrl_err(ctrl,
76                                          "No free bus for hot-added bridge\n");
77                                 pci_dev_put(dev);
78                                 continue;
79                         }
80                         child = pci_add_new_bus(parent, dev, busnr);
81                         if (!child) {
82                                 ctrl_err(ctrl, "Cannot add new bus for %s\n",
83                                          pci_name(dev));
84                                 pci_dev_put(dev);
85                                 continue;
86                         }
87                         child->subordinate = pci_do_scan_bus(child);
88                         pci_bus_size_bridges(child);
89                 }
90                 pci_configure_slot(dev);
91                 pci_dev_put(dev);
92         }
93
94         pci_bus_assign_resources(parent);
95         pci_bus_add_devices(parent);
96         pci_enable_bridges(parent);
97         return 0;
98 }
99
100 int shpchp_unconfigure_device(struct slot *p_slot)
101 {
102         int rc = 0;
103         int j;
104         u8 bctl = 0;
105         struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
106         struct controller *ctrl = p_slot->ctrl;
107
108         ctrl_dbg(ctrl, "%s: domain:bus:dev = %04x:%02x:%02x\n",
109                  __func__, pci_domain_nr(parent), p_slot->bus, p_slot->device);
110
111         for (j = 0; j < 8 ; j++) {
112                 struct pci_dev *temp = pci_get_slot(parent,
113                                 (p_slot->device << 3) | j);
114                 if (!temp)
115                         continue;
116                 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
117                         pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
118                         if (bctl & PCI_BRIDGE_CTL_VGA) {
119                                 ctrl_err(ctrl,
120                                          "Cannot remove display device %s\n",
121                                          pci_name(temp));
122                                 pci_dev_put(temp);
123                                 rc = -EINVAL;
124                                 break;
125                         }
126                 }
127                 pci_remove_bus_device(temp);
128                 pci_dev_put(temp);
129         }
130         return rc;
131 }
132