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1da177e4 LT |
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 | * | |
8cf4c195 | 26 | * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> |
1da177e4 LT |
27 | * |
28 | */ | |
29 | ||
1da177e4 LT |
30 | #include <linux/module.h> |
31 | #include <linux/kernel.h> | |
32 | #include <linux/types.h> | |
1da177e4 LT |
33 | #include <linux/pci.h> |
34 | #include "../pci.h" | |
35 | #include "pciehp.h" | |
1da177e4 LT |
36 | |
37 | ||
71b720c0 | 38 | int pciehp_configure_device(struct slot *p_slot) |
1da177e4 | 39 | { |
71b720c0 RS |
40 | struct pci_dev *dev; |
41 | struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate; | |
42 | int num, fn; | |
43 | ||
44 | dev = pci_find_slot(p_slot->bus, PCI_DEVFN(p_slot->device, 0)); | |
45 | if (dev) { | |
46 | err("Device %s already exists at %x:%x, cannot hot-add\n", | |
47 | pci_name(dev), p_slot->bus, p_slot->device); | |
48 | return -EINVAL; | |
1da177e4 LT |
49 | } |
50 | ||
71b720c0 RS |
51 | num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0)); |
52 | if (num == 0) { | |
53 | err("No new device found\n"); | |
54 | return -ENODEV; | |
55 | } | |
1da177e4 | 56 | |
71b720c0 RS |
57 | for (fn = 0; fn < 8; fn++) { |
58 | if (!(dev = pci_find_slot(p_slot->bus, | |
59 | PCI_DEVFN(p_slot->device, fn)))) | |
60 | continue; | |
61 | if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) { | |
62 | err("Cannot hot-add display device %s\n", | |
63 | pci_name(dev)); | |
64 | continue; | |
65 | } | |
66 | if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) || | |
67 | (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) { | |
68 | /* Find an unused bus number for the new bridge */ | |
69 | struct pci_bus *child; | |
70 | unsigned char busnr, start = parent->secondary; | |
71 | unsigned char end = parent->subordinate; | |
72 | for (busnr = start; busnr <= end; busnr++) { | |
73 | if (!pci_find_bus(pci_domain_nr(parent), | |
74 | busnr)) | |
75 | break; | |
76 | } | |
77 | if (busnr >= end) { | |
78 | err("No free bus for hot-added bridge\n"); | |
79 | continue; | |
80 | } | |
81 | child = pci_add_new_bus(parent, dev, busnr); | |
82 | if (!child) { | |
83 | err("Cannot add new bus for %s\n", | |
84 | pci_name(dev)); | |
85 | continue; | |
86 | } | |
87 | child->subordinate = pci_do_scan_bus(child); | |
88 | pci_bus_size_bridges(child); | |
89 | } | |
90 | /* TBD: program firmware provided _HPP values */ | |
91 | /* program_fw_provided_values(dev); */ | |
1da177e4 LT |
92 | } |
93 | ||
71b720c0 RS |
94 | pci_bus_assign_resources(parent); |
95 | pci_bus_add_devices(parent); | |
96 | pci_enable_bridges(parent); | |
1da177e4 LT |
97 | return 0; |
98 | } | |
99 | ||
ca22a5e4 | 100 | int pciehp_unconfigure_device(struct slot *p_slot) |
1da177e4 LT |
101 | { |
102 | int rc = 0; | |
103 | int j; | |
ca22a5e4 | 104 | u8 bctl = 0; |
1da177e4 | 105 | |
ca22a5e4 RS |
106 | dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, |
107 | p_slot->device); | |
1da177e4 LT |
108 | |
109 | for (j=0; j<8 ; j++) { | |
ca22a5e4 RS |
110 | struct pci_dev* temp = pci_find_slot(p_slot->bus, |
111 | (p_slot->device << 3) | j); | |
112 | if (!temp) | |
113 | continue; | |
114 | if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) { | |
115 | err("Cannot remove display device %s\n", | |
116 | pci_name(temp)); | |
117 | continue; | |
118 | } | |
119 | if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) { | |
120 | pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl); | |
121 | if (bctl & PCI_BRIDGE_CTL_VGA) { | |
122 | err("Cannot remove display device %s\n", | |
123 | pci_name(temp)); | |
124 | continue; | |
125 | } | |
1da177e4 | 126 | } |
ca22a5e4 | 127 | pci_remove_bus_device(temp); |
1da177e4 LT |
128 | } |
129 | /* | |
130 | * Some PCI Express root ports require fixup after hot-plug operation. | |
131 | */ | |
132 | if (pcie_mch_quirk) | |
ca22a5e4 | 133 | pci_fixup_device(pci_fixup_final, p_slot->ctrl->pci_dev); |
1da177e4 LT |
134 | |
135 | return rc; | |
136 | } | |
137 |