blob: 257adc2339966ac856ab2056097a528d82a6c7fa [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Kristen Accardi8cf4c192005-08-16 15:16:10 -070026 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 *
28 */
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/types.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/pci.h>
34#include "../pci.h"
35#include "shpchp.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Adrian Bunk48b19142005-11-06 01:45:08 +010037static void program_fw_provided_values(struct pci_dev *dev)
rajesh.shah@intel.com424600f2005-10-13 12:05:38 -070038{
39 u16 pci_cmd, pci_bctl;
40 struct pci_dev *cdev;
Kristen Accardi783c49f2006-03-03 10:16:05 -080041 struct hotplug_params hpp;
rajesh.shah@intel.com424600f2005-10-13 12:05:38 -070042
43 /* Program hpp values for this device */
44 if (!(dev->hdr_type == PCI_HEADER_TYPE_NORMAL ||
45 (dev->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
46 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
47 return;
48
Kristen Accardi783c49f2006-03-03 10:16:05 -080049 /* use default values if we can't get them from firmware */
50 if (get_hp_params_from_firmware(dev, &hpp)) {
51 hpp.cache_line_size = 8;
52 hpp.latency_timer = 0x40;
53 hpp.enable_serr = 0;
54 hpp.enable_perr = 0;
55 }
rajesh.shah@intel.com424600f2005-10-13 12:05:38 -070056
57 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, hpp.cache_line_size);
58 pci_write_config_byte(dev, PCI_LATENCY_TIMER, hpp.latency_timer);
59 pci_read_config_word(dev, PCI_COMMAND, &pci_cmd);
60 if (hpp.enable_serr)
61 pci_cmd |= PCI_COMMAND_SERR;
62 else
63 pci_cmd &= ~PCI_COMMAND_SERR;
64 if (hpp.enable_perr)
65 pci_cmd |= PCI_COMMAND_PARITY;
66 else
67 pci_cmd &= ~PCI_COMMAND_PARITY;
68 pci_write_config_word(dev, PCI_COMMAND, pci_cmd);
69
70 /* Program bridge control value and child devices */
71 if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
72 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER,
73 hpp.latency_timer);
74 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &pci_bctl);
75 if (hpp.enable_serr)
76 pci_bctl |= PCI_BRIDGE_CTL_SERR;
77 else
78 pci_bctl &= ~PCI_BRIDGE_CTL_SERR;
79 if (hpp.enable_perr)
80 pci_bctl |= PCI_BRIDGE_CTL_PARITY;
81 else
82 pci_bctl &= ~PCI_BRIDGE_CTL_PARITY;
83 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, pci_bctl);
84 if (dev->subordinate) {
85 list_for_each_entry(cdev, &dev->subordinate->devices,
86 bus_list)
87 program_fw_provided_values(cdev);
88 }
89 }
90}
91
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -070092int shpchp_configure_device(struct slot *p_slot)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -070094 struct pci_dev *dev;
95 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
96 int num, fn;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +090098 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, 0));
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -070099 if (dev) {
100 err("Device %s already exists at %x:%x, cannot hot-add\n",
101 pci_name(dev), p_slot->bus, p_slot->device);
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900102 pci_dev_put(dev);
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700103 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
105
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700106 num = pci_scan_slot(parent, PCI_DEVFN(p_slot->device, 0));
107 if (num == 0) {
108 err("No new device found\n");
109 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700112 for (fn = 0; fn < 8; fn++) {
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900113 dev = pci_get_slot(parent, PCI_DEVFN(p_slot->device, fn));
114 if (!dev)
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700115 continue;
116 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
117 err("Cannot hot-add display device %s\n",
118 pci_name(dev));
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900119 pci_dev_put(dev);
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700120 continue;
121 }
122 if ((dev->hdr_type == PCI_HEADER_TYPE_BRIDGE) ||
123 (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
124 /* Find an unused bus number for the new bridge */
125 struct pci_bus *child;
126 unsigned char busnr, start = parent->secondary;
127 unsigned char end = parent->subordinate;
128 for (busnr = start; busnr <= end; busnr++) {
129 if (!pci_find_bus(pci_domain_nr(parent),
130 busnr))
131 break;
132 }
133 if (busnr >= end) {
134 err("No free bus for hot-added bridge\n");
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900135 pci_dev_put(dev);
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700136 continue;
137 }
138 child = pci_add_new_bus(parent, dev, busnr);
139 if (!child) {
140 err("Cannot add new bus for %s\n",
141 pci_name(dev));
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900142 pci_dev_put(dev);
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700143 continue;
144 }
145 child->subordinate = pci_do_scan_bus(child);
146 pci_bus_size_bridges(child);
147 }
rajesh.shah@intel.com424600f2005-10-13 12:05:38 -0700148 program_fw_provided_values(dev);
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900149 pci_dev_put(dev);
rajesh.shah@intel.comdbd7a782005-10-13 12:05:36 -0700150 }
151
152 pci_bus_assign_resources(parent);
153 pci_bus_add_devices(parent);
154 pci_enable_bridges(parent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return 0;
156}
157
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700158int shpchp_unconfigure_device(struct slot *p_slot)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160 int rc = 0;
161 int j;
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700162 u8 bctl = 0;
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900163 struct pci_bus *parent = p_slot->ctrl->pci_dev->subordinate;
164
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700165 dbg("%s: bus/dev = %x/%x\n", __FUNCTION__, p_slot->bus, p_slot->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
167 for (j=0; j<8 ; j++) {
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900168 struct pci_dev* temp = pci_get_slot(parent,
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700169 (p_slot->device << 3) | j);
170 if (!temp)
171 continue;
172 if ((temp->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
173 err("Cannot remove display device %s\n",
174 pci_name(temp));
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900175 pci_dev_put(temp);
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700176 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 }
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700178 if (temp->hdr_type == PCI_HEADER_TYPE_BRIDGE) {
179 pci_read_config_byte(temp, PCI_BRIDGE_CONTROL, &bctl);
180 if (bctl & PCI_BRIDGE_CTL_VGA) {
181 err("Cannot remove display device %s\n",
182 pci_name(temp));
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900183 pci_dev_put(temp);
rajesh.shah@intel.com2178bfa2005-10-13 12:05:41 -0700184 continue;
185 }
186 }
187 pci_remove_bus_device(temp);
Kenji Kaneshigee00e57e2005-11-25 12:21:25 +0900188 pci_dev_put(temp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 }
190 return rc;
191}
192