blob: 233c40c5168412da11e3bd826a7d3a3fadd0691d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
3 *
4 * Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 * Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 *
26 * TBD:
27 * 1. Support more than one IRQ resource entry per link device (index).
28 * 2. Implement start/stop mechanism and use ACPI Bus Driver facilities
29 * for IRQ management (e.g. start()->_SRS).
30 */
31
32#include <linux/sysdev.h>
33#include <linux/kernel.h>
34#include <linux/module.h>
35#include <linux/init.h>
36#include <linux/types.h>
37#include <linux/proc_fs.h>
38#include <linux/spinlock.h>
39#include <linux/pm.h>
40#include <linux/pci.h>
Ingo Molnar36e43092006-04-27 05:25:00 -040041#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#include <acpi/acpi_bus.h>
44#include <acpi/acpi_drivers.h>
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050047ACPI_MODULE_NAME("pci_link");
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
50#define ACPI_PCI_LINK_FILE_INFO "info"
51#define ACPI_PCI_LINK_FILE_STATUS "state"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#define ACPI_PCI_LINK_MAX_POSSIBLE 16
Len Brown4be44fc2005-08-05 00:44:28 -040053static int acpi_pci_link_add(struct acpi_device *device);
54static int acpi_pci_link_remove(struct acpi_device *device, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Thomas Renninger1ba90e32007-07-23 14:44:41 +020056static struct acpi_device_id link_device_ids[] = {
57 {"PNP0C0F", 0},
58 {"", 0},
59};
60MODULE_DEVICE_TABLE(acpi, link_device_ids);
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static struct acpi_driver acpi_pci_link_driver = {
Len Brownc2b6705b2007-02-12 23:33:40 -050063 .name = "pci_link",
Len Brown4be44fc2005-08-05 00:44:28 -040064 .class = ACPI_PCI_LINK_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020065 .ids = link_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040066 .ops = {
67 .add = acpi_pci_link_add,
68 .remove = acpi_pci_link_remove,
69 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070070};
71
David Shaohua Li87bec662005-07-27 23:02:00 -040072/*
73 * If a link is initialized, we never change its active and initialized
74 * later even the link is disable. Instead, we just repick the active irq
75 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070076struct acpi_pci_link_irq {
Len Brown4be44fc2005-08-05 00:44:28 -040077 u8 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040078 u8 triggering; /* All IRQs */
79 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040080 u8 resource_type;
81 u8 possible_count;
82 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
83 u8 initialized:1;
84 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070085};
86
87struct acpi_pci_link {
Len Brown4be44fc2005-08-05 00:44:28 -040088 struct list_head node;
89 struct acpi_device *device;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 struct acpi_pci_link_irq irq;
Len Brown4be44fc2005-08-05 00:44:28 -040091 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092};
93
94static struct {
Len Brown4be44fc2005-08-05 00:44:28 -040095 int count;
96 struct list_head entries;
97} acpi_link;
Adrian Bunke5685b92007-10-24 18:24:42 +020098static DEFINE_MUTEX(acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100/* --------------------------------------------------------------------------
101 PCI Link Device Management
102 -------------------------------------------------------------------------- */
103
104/*
105 * set context (link) possible list from resource list
106 */
107static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400108acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200110 struct acpi_pci_link *link = context;
Len Brown4be44fc2005-08-05 00:44:28 -0400111 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Len Browneca008c2005-09-22 00:25:18 -0400114 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400115 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
Patrick Mocheld550d982006-06-27 00:41:40 -0400116 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400117 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400118 {
119 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400120 if (!p || !p->interrupt_count) {
Len Browncece9292006-06-26 23:04:31 -0400121 printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400122 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 }
Len Brown4be44fc2005-08-05 00:44:28 -0400124 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400125 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400126 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
127 if (!p->interrupts[i]) {
Len Browncece9292006-06-26 23:04:31 -0400128 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
129 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400130 continue;
131 }
132 link->irq.possible[i] = p->interrupts[i];
133 link->irq.possible_count++;
134 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400135 link->irq.triggering = p->triggering;
136 link->irq.polarity = p->polarity;
137 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400138 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400140 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400141 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400142 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400143 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400144 if (!p || !p->interrupt_count) {
Len Browncece9292006-06-26 23:04:31 -0400145 printk(KERN_WARNING PREFIX
146 "Blank EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400147 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 }
Len Brown4be44fc2005-08-05 00:44:28 -0400149 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400150 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400151 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
152 if (!p->interrupts[i]) {
Len Browncece9292006-06-26 23:04:31 -0400153 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
154 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400155 continue;
156 }
157 link->irq.possible[i] = p->interrupts[i];
158 link->irq.possible_count++;
159 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400160 link->irq.triggering = p->triggering;
161 link->irq.polarity = p->polarity;
162 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400163 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 default:
Len Brown64684632006-06-26 23:41:38 -0400166 printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400167 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 }
169
Patrick Mocheld550d982006-06-27 00:41:40 -0400170 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171}
172
Len Brown4be44fc2005-08-05 00:44:28 -0400173static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
Len Brown4be44fc2005-08-05 00:44:28 -0400175 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400179 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Patrick Mochel67a71362006-05-19 16:54:42 -0400181 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400182 acpi_pci_link_check_possible, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400184 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400185 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 }
187
Len Brown4be44fc2005-08-05 00:44:28 -0400188 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
189 "Found %d possible IRQs\n",
190 link->irq.possible_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Patrick Mocheld550d982006-06-27 00:41:40 -0400192 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400196acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Len Brown4be44fc2005-08-05 00:44:28 -0400198 int *irq = (int *)context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Len Browneca008c2005-09-22 00:25:18 -0400201 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400202 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400203 {
204 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400205 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400206 /*
207 * IRQ descriptors may have no IRQ# bits set,
208 * particularly those those w/ _STA disabled
209 */
210 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
211 "Blank IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400212 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400213 }
214 *irq = p->interrupts[0];
215 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400217 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400218 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400219 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400220 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400221 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400222 /*
223 * extended IRQ descriptors must
224 * return at least 1 IRQ
225 */
Len Browncece9292006-06-26 23:04:31 -0400226 printk(KERN_WARNING PREFIX
227 "Blank EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400228 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400229 }
230 *irq = p->interrupts[0];
231 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
Len Brownd4ec6c72006-01-26 17:23:38 -0500233 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 default:
Len Brown64684632006-06-26 23:41:38 -0400235 printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type);
Len Brownd4ec6c72006-01-26 17:23:38 -0500236 case ACPI_RESOURCE_TYPE_END_TAG:
Patrick Mocheld550d982006-06-27 00:41:40 -0400237 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400239 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240}
241
242/*
243 * Run _CRS and set link->irq.active
244 *
245 * return value:
246 * 0 - success
247 * !0 - failure
248 */
Len Brown4be44fc2005-08-05 00:44:28 -0400249static int acpi_pci_link_get_current(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250{
Len Brown4be44fc2005-08-05 00:44:28 -0400251 int result = 0;
252 acpi_status status = AE_OK;
253 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Patrick Mochele0e4e112006-05-19 16:54:50 -0400255 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400256 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 link->irq.active = 0;
259
260 /* in practice, status disabled is meaningless, ignore it */
261 if (acpi_strict) {
262 /* Query _STA, set link->device->status */
263 result = acpi_bus_get_status(link->device);
264 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400265 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 goto end;
267 }
268
269 if (!link->device->status.enabled) {
270 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400271 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 }
274
275 /*
276 * Query and parse _CRS to get the current IRQ assignment.
277 */
278
Patrick Mochel67a71362006-05-19 16:54:42 -0400279 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400280 acpi_pci_link_check_current, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400282 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 result = -ENODEV;
284 goto end;
285 }
286
287 if (acpi_strict && !irq) {
Len Brown64684632006-06-26 23:41:38 -0400288 printk(KERN_ERR PREFIX "_CRS returned 0\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 result = -ENODEV;
290 }
291
292 link->irq.active = irq;
293
294 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
295
Len Brown4be44fc2005-08-05 00:44:28 -0400296 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400297 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
Len Brown4be44fc2005-08-05 00:44:28 -0400300static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
Len Brown4be44fc2005-08-05 00:44:28 -0400302 int result = 0;
303 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 struct {
Len Brown4be44fc2005-08-05 00:44:28 -0400305 struct acpi_resource res;
306 struct acpi_resource end;
307 } *resource;
308 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311 if (!link || !irq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400312 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Burman Yan36bcbec2006-12-19 12:56:11 -0800314 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400315 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400316 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Len Brown4be44fc2005-08-05 00:44:28 -0400318 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 buffer.pointer = resource;
320
Len Brown4be44fc2005-08-05 00:44:28 -0400321 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400322 case ACPI_RESOURCE_TYPE_IRQ:
323 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400325 resource->res.data.irq.triggering = link->irq.triggering;
326 resource->res.data.irq.polarity =
327 link->irq.polarity;
328 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
329 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400330 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400332 resource->res.data.irq.sharable = ACPI_SHARED;
333 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 resource->res.data.irq.interrupts[0] = irq;
335 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400336
Bob Moore50eca3e2005-09-30 19:03:00 -0400337 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
338 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400340 resource->res.data.extended_irq.producer_consumer =
341 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400342 resource->res.data.extended_irq.triggering =
343 link->irq.triggering;
344 resource->res.data.extended_irq.polarity =
345 link->irq.polarity;
346 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
347 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400348 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400350 resource->res.data.irq.sharable = ACPI_SHARED;
351 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 resource->res.data.extended_irq.interrupts[0] = irq;
353 /* ignore resource_source, it's optional */
354 break;
355 default:
Len Brown64684632006-06-26 23:41:38 -0400356 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 result = -EINVAL;
358 goto end;
359
360 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400361 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 /* Attempt to set the resource */
Patrick Mochel67a71362006-05-19 16:54:42 -0400364 status = acpi_set_current_resources(link->device->handle, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
366 /* check for total failure */
367 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400368 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 result = -ENODEV;
370 goto end;
371 }
372
373 /* Query _STA, set device->status */
374 result = acpi_bus_get_status(link->device);
375 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400376 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 goto end;
378 }
379 if (!link->device->status.enabled) {
Len Browncece9292006-06-26 23:04:31 -0400380 printk(KERN_WARNING PREFIX
381 "%s [%s] disabled and referenced, BIOS bug\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400382 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400383 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
385
386 /* Query _CRS, set link->irq.active */
387 result = acpi_pci_link_get_current(link);
388 if (result) {
389 goto end;
390 }
391
392 /*
393 * Is current setting not what we set?
394 * set link->irq.active
395 */
396 if (link->irq.active != irq) {
397 /*
398 * policy: when _CRS doesn't return what we just _SRS
399 * assume _SRS worked and override _CRS value.
400 */
Len Browncece9292006-06-26 23:04:31 -0400401 printk(KERN_WARNING PREFIX
402 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400403 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400404 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 link->irq.active = irq;
406 }
407
408 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400409
410 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 kfree(resource);
Patrick Mocheld550d982006-06-27 00:41:40 -0400412 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413}
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415/* --------------------------------------------------------------------------
416 PCI Link IRQ Management
417 -------------------------------------------------------------------------- */
418
419/*
420 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
421 * Link Devices to move the PIRQs around to minimize sharing.
422 *
423 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
424 * that the BIOS has already set to active. This is necessary because
425 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
426 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
427 * even if acpi_irq_nobalance is set.
428 *
429 * A tables of penalties avoids directing PCI interrupts to well known
430 * ISA IRQs. Boot params are available to over-ride the default table:
431 *
432 * List interrupts that are free for PCI use.
433 * acpi_irq_pci=n[,m]
434 *
435 * List interrupts that should not be used for PCI:
436 * acpi_irq_isa=n[,m]
437 *
438 * Note that PCI IRQ routers have a list of possible IRQs,
439 * which may not include the IRQs this table says are available.
440 *
441 * Since this heuristic can't tell the difference between a link
442 * that no device will attach to, vs. a link which may be shared
443 * by multiple active devices -- it is not optimal.
444 *
445 * If interrupt performance is that important, get an IO-APIC system
446 * with a pin dedicated to each device. Or for that matter, an MSI
447 * enabled system.
448 */
449
450#define ACPI_MAX_IRQS 256
451#define ACPI_MAX_ISA_IRQ 16
452
453#define PIRQ_PENALTY_PCI_AVAILABLE (0)
454#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
455#define PIRQ_PENALTY_PCI_USING (16*16*16)
456#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
457#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
458#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
459
460static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
461 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
462 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
463 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
465 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
467 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
468 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
469 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
470 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
471 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
472 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
473 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
474 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
475 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
476 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Len Brown4be44fc2005-08-05 00:44:28 -0400477 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478};
479
Len Brown4be44fc2005-08-05 00:44:28 -0400480int __init acpi_irq_penalty_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481{
Len Brown4be44fc2005-08-05 00:44:28 -0400482 struct list_head *node = NULL;
483 struct acpi_pci_link *link = NULL;
484 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 /*
488 * Update penalties to facilitate IRQ balancing.
489 */
490 list_for_each(node, &acpi_link.entries) {
491
492 link = list_entry(node, struct acpi_pci_link, node);
493 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400494 printk(KERN_ERR PREFIX "Invalid link context\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 continue;
496 }
497
498 /*
499 * reflect the possible and active irqs in the penalty table --
500 * useful for breaking ties.
501 */
502 if (link->irq.possible_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400503 int penalty =
504 PIRQ_PENALTY_PCI_POSSIBLE /
505 link->irq.possible_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506
507 for (i = 0; i < link->irq.possible_count; i++) {
508 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
Len Brown4be44fc2005-08-05 00:44:28 -0400509 acpi_irq_penalty[link->irq.
510 possible[i]] +=
511 penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 }
513
514 } else if (link->irq.active) {
Len Brown4be44fc2005-08-05 00:44:28 -0400515 acpi_irq_penalty[link->irq.active] +=
516 PIRQ_PENALTY_PCI_POSSIBLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
518 }
519 /* Add a penalty for the SCI */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300520 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
Patrick Mocheld550d982006-06-27 00:41:40 -0400522 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
524
525static int acpi_irq_balance; /* 0: static, 1: balance */
526
Len Brown4be44fc2005-08-05 00:44:28 -0400527static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528{
Len Brown4be44fc2005-08-05 00:44:28 -0400529 int irq;
530 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532
David Shaohua Li87bec662005-07-27 23:02:00 -0400533 if (link->irq.initialized) {
534 if (link->refcnt == 0)
535 /* This means the link is disabled but initialized */
536 acpi_pci_link_set(link, link->irq.active);
Patrick Mocheld550d982006-06-27 00:41:40 -0400537 return 0;
David Shaohua Li87bec662005-07-27 23:02:00 -0400538 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540 /*
541 * search for active IRQ in list of possible IRQs.
542 */
543 for (i = 0; i < link->irq.possible_count; ++i) {
544 if (link->irq.active == link->irq.possible[i])
545 break;
546 }
547 /*
548 * forget active IRQ that is not in possible list
549 */
550 if (i == link->irq.possible_count) {
551 if (acpi_strict)
Len Browncece9292006-06-26 23:04:31 -0400552 printk(KERN_WARNING PREFIX "_CRS %d not found"
553 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 link->irq.active = 0;
555 }
556
557 /*
558 * if active found, use it; else pick entry from end of possible list.
559 */
560 if (link->irq.active) {
561 irq = link->irq.active;
562 } else {
563 irq = link->irq.possible[link->irq.possible_count - 1];
564 }
565
566 if (acpi_irq_balance || !link->irq.active) {
567 /*
568 * Select the best IRQ. This is done in reverse to promote
569 * the use of IRQs 9, 10, 11, and >15.
570 */
571 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Len Brown4be44fc2005-08-05 00:44:28 -0400572 if (acpi_irq_penalty[irq] >
573 acpi_irq_penalty[link->irq.possible[i]])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 irq = link->irq.possible[i];
575 }
576 }
577
578 /* Attempt to enable the link device at this IRQ. */
579 if (acpi_pci_link_set(link, irq)) {
Len Brown64684632006-06-26 23:41:38 -0400580 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
581 "Try pci=noacpi or acpi=off\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400582 acpi_device_name(link->device),
Len Brown64684632006-06-26 23:41:38 -0400583 acpi_device_bid(link->device));
Patrick Mocheld550d982006-06-27 00:41:40 -0400584 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 } else {
586 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
Len Brown4be44fc2005-08-05 00:44:28 -0400587 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
588 acpi_device_name(link->device),
589 acpi_device_bid(link->device), link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
591
592 link->irq.initialized = 1;
593
Patrick Mocheld550d982006-06-27 00:41:40 -0400594 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595}
596
597/*
David Shaohua Li87bec662005-07-27 23:02:00 -0400598 * acpi_pci_link_allocate_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 * success: return IRQ >= 0
600 * failure: return -1
601 */
602
603int
Len Brown4be44fc2005-08-05 00:44:28 -0400604acpi_pci_link_allocate_irq(acpi_handle handle,
605 int index,
Bob Moore50eca3e2005-09-30 19:03:00 -0400606 int *triggering, int *polarity, char **name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607{
Len Brown4be44fc2005-08-05 00:44:28 -0400608 int result = 0;
609 struct acpi_device *device = NULL;
610 struct acpi_pci_link *link = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
613 result = acpi_bus_get_device(handle, &device);
614 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400615 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400616 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
618
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200619 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400621 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400622 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 }
624
625 /* TBD: Support multiple index (IRQ) entries per Link Device */
626 if (index) {
Len Brown64684632006-06-26 23:41:38 -0400627 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
Patrick Mocheld550d982006-06-27 00:41:40 -0400628 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630
Ingo Molnar36e43092006-04-27 05:25:00 -0400631 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400632 if (acpi_pci_link_allocate(link)) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400633 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400634 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400635 }
Len Brown4be44fc2005-08-05 00:44:28 -0400636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 if (!link->irq.active) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400638 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400639 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400640 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 }
Len Brown4be44fc2005-08-05 00:44:28 -0400642 link->refcnt++;
Ingo Molnar36e43092006-04-27 05:25:00 -0400643 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Bob Moore50eca3e2005-09-30 19:03:00 -0400645 if (triggering)
646 *triggering = link->irq.triggering;
647 if (polarity)
648 *polarity = link->irq.polarity;
Len Brown4be44fc2005-08-05 00:44:28 -0400649 if (name)
650 *name = acpi_device_bid(link->device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400651 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400652 "Link %s is referenced\n",
653 acpi_device_bid(link->device)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400654 return (link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
656
David Shaohua Li87bec662005-07-27 23:02:00 -0400657/*
658 * We don't change link's irq information here. After it is reenabled, we
659 * continue use the info
660 */
Len Brown4be44fc2005-08-05 00:44:28 -0400661int acpi_pci_link_free_irq(acpi_handle handle)
David Shaohua Li87bec662005-07-27 23:02:00 -0400662{
Len Brown4be44fc2005-08-05 00:44:28 -0400663 struct acpi_device *device = NULL;
664 struct acpi_pci_link *link = NULL;
665 acpi_status result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666
David Shaohua Li87bec662005-07-27 23:02:00 -0400667
668 result = acpi_bus_get_device(handle, &device);
669 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400670 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400671 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400672 }
673
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200674 link = acpi_driver_data(device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400675 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400676 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400677 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400678 }
679
Ingo Molnar36e43092006-04-27 05:25:00 -0400680 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400681 if (!link->irq.initialized) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400682 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400683 printk(KERN_ERR PREFIX "Link isn't initialized\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400684 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400685 }
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400686#ifdef FUTURE_USE
687 /*
688 * The Link reference count allows us to _DISable an unused link
689 * and suspend time, and set it again on resume.
690 * However, 2.6.12 still has irq_router.resume
691 * which blindly restores the link state.
692 * So we disable the reference count method
693 * to prevent duplicate acpi_pci_link_set()
694 * which would harm some systems
695 */
Len Brown4be44fc2005-08-05 00:44:28 -0400696 link->refcnt--;
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400697#endif
David Shaohua Li87bec662005-07-27 23:02:00 -0400698 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400699 "Link %s is dereferenced\n",
700 acpi_device_bid(link->device)));
David Shaohua Li87bec662005-07-27 23:02:00 -0400701
702 if (link->refcnt == 0) {
Patrick Mochel67a71362006-05-19 16:54:42 -0400703 acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL);
David Shaohua Li87bec662005-07-27 23:02:00 -0400704 }
Ingo Molnar36e43092006-04-27 05:25:00 -0400705 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400706 return (link->irq.active);
David Shaohua Li87bec662005-07-27 23:02:00 -0400707}
Len Brown4be44fc2005-08-05 00:44:28 -0400708
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709/* --------------------------------------------------------------------------
710 Driver Interface
711 -------------------------------------------------------------------------- */
712
Len Brown4be44fc2005-08-05 00:44:28 -0400713static int acpi_pci_link_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714{
Len Brown4be44fc2005-08-05 00:44:28 -0400715 int result = 0;
716 struct acpi_pci_link *link = NULL;
717 int i = 0;
718 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720
721 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400722 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723
Burman Yan36bcbec2006-12-19 12:56:11 -0800724 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400726 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728 link->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
730 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
731 acpi_driver_data(device) = link;
732
Ingo Molnar36e43092006-04-27 05:25:00 -0400733 mutex_lock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 result = acpi_pci_link_get_possible(link);
735 if (result)
736 goto end;
737
738 /* query and set link->irq.active */
739 acpi_pci_link_get_current(link);
740
Dan Aloni0dc070b2007-07-09 11:33:18 -0700741 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400742 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 for (i = 0; i < link->irq.possible_count; i++) {
744 if (link->irq.active == link->irq.possible[i]) {
745 printk(" *%d", link->irq.possible[i]);
746 found = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400747 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 printk(" %d", link->irq.possible[i]);
749 }
750
751 printk(")");
752
753 if (!found)
754 printk(" *%d", link->irq.active);
755
Len Brown4be44fc2005-08-05 00:44:28 -0400756 if (!link->device->status.enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 printk(", disabled.");
758
759 printk("\n");
760
761 /* TBD: Acquire/release lock */
762 list_add_tail(&link->node, &acpi_link.entries);
763 acpi_link.count++;
764
Len Brown4be44fc2005-08-05 00:44:28 -0400765 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 /* disable all links -- to be activated on use */
Patrick Mochel67a71362006-05-19 16:54:42 -0400767 acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL);
Ingo Molnar36e43092006-04-27 05:25:00 -0400768 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770 if (result)
771 kfree(link);
772
Patrick Mocheld550d982006-06-27 00:41:40 -0400773 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
Len Brown4be44fc2005-08-05 00:44:28 -0400776static int acpi_pci_link_resume(struct acpi_pci_link *link)
Linus Torvalds697a2d62005-08-01 12:37:54 -0700777{
Linus Torvalds697a2d62005-08-01 12:37:54 -0700778
779 if (link->refcnt && link->irq.active && link->irq.initialized)
Patrick Mocheld550d982006-06-27 00:41:40 -0400780 return (acpi_pci_link_set(link, link->irq.active));
Linus Torvalds697a2d62005-08-01 12:37:54 -0700781 else
Patrick Mocheld550d982006-06-27 00:41:40 -0400782 return 0;
Linus Torvalds697a2d62005-08-01 12:37:54 -0700783}
784
Len Brown4be44fc2005-08-05 00:44:28 -0400785static int irqrouter_resume(struct sys_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786{
Len Brown4be44fc2005-08-05 00:44:28 -0400787 struct list_head *node = NULL;
788 struct acpi_pci_link *link = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Linus Torvalds56035092006-06-19 18:05:09 -0700791 /* Make sure SCI is enabled again (Apple firmware bug?) */
Bob Moored8c71b62007-02-02 19:48:21 +0300792 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);
Linus Torvalds56035092006-06-19 18:05:09 -0700793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 list_for_each(node, &acpi_link.entries) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 link = list_entry(node, struct acpi_pci_link, node);
796 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400797 printk(KERN_ERR PREFIX "Invalid link context\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 continue;
799 }
Linus Torvalds697a2d62005-08-01 12:37:54 -0700800 acpi_pci_link_resume(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400802 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803}
804
Len Brown4be44fc2005-08-05 00:44:28 -0400805static int acpi_pci_link_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806{
807 struct acpi_pci_link *link = NULL;
808
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -0400811 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200813 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
Ingo Molnar36e43092006-04-27 05:25:00 -0400815 mutex_lock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 list_del(&link->node);
Ingo Molnar36e43092006-04-27 05:25:00 -0400817 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
819 kfree(link);
820
Patrick Mocheld550d982006-06-27 00:41:40 -0400821 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822}
823
824/*
825 * modify acpi_irq_penalty[] from cmdline
826 */
827static int __init acpi_irq_penalty_update(char *str, int used)
828{
829 int i;
830
831 for (i = 0; i < 16; i++) {
832 int retval;
833 int irq;
834
Len Brown4be44fc2005-08-05 00:44:28 -0400835 retval = get_option(&str, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
837 if (!retval)
838 break; /* no number found */
839
840 if (irq < 0)
841 continue;
Len Brown4be44fc2005-08-05 00:44:28 -0400842
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 if (irq >= ACPI_MAX_IRQS)
844 continue;
845
846 if (used)
847 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
848 else
849 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
850
851 if (retval != 2) /* no next number */
852 break;
853 }
854 return 1;
855}
856
857/*
858 * We'd like PNP to call this routine for the
859 * single ISA_USED value for each legacy device.
860 * But instead it calls us with each POSSIBLE setting.
861 * There is no ISA_POSSIBLE weight, so we simply use
862 * the (small) PCI_USING penalty.
863 */
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500864void acpi_penalize_isa_irq(int irq, int active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500866 if (active)
867 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
868 else
869 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870}
871
872/*
873 * Over-ride default table to reserve additional IRQs for use by ISA
874 * e.g. acpi_irq_isa=5
875 * Useful for telling ACPI how not to interfere with your ISA sound card.
876 */
877static int __init acpi_irq_isa(char *str)
878{
879 return acpi_irq_penalty_update(str, 1);
880}
Len Brown4be44fc2005-08-05 00:44:28 -0400881
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882__setup("acpi_irq_isa=", acpi_irq_isa);
883
884/*
885 * Over-ride default table to free additional IRQs for use by PCI
886 * e.g. acpi_irq_pci=7,15
887 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
888 */
889static int __init acpi_irq_pci(char *str)
890{
891 return acpi_irq_penalty_update(str, 0);
892}
Len Brown4be44fc2005-08-05 00:44:28 -0400893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894__setup("acpi_irq_pci=", acpi_irq_pci);
895
896static int __init acpi_irq_nobalance_set(char *str)
897{
898 acpi_irq_balance = 0;
899 return 1;
900}
Len Brown4be44fc2005-08-05 00:44:28 -0400901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
903
904int __init acpi_irq_balance_set(char *str)
905{
906 acpi_irq_balance = 1;
907 return 1;
908}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
Len Brown4be44fc2005-08-05 00:44:28 -0400910__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
David Shaohua Li87bec662005-07-27 23:02:00 -0400912/* FIXME: we will remove this interface after all drivers call pci_disable_device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700913static struct sysdev_class irqrouter_sysdev_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100914 .name = "irqrouter",
Len Brown4be44fc2005-08-05 00:44:28 -0400915 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916};
917
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918static struct sys_device device_irqrouter = {
Len Brown4be44fc2005-08-05 00:44:28 -0400919 .id = 0,
920 .cls = &irqrouter_sysdev_class,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921};
922
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923static int __init irqrouter_init_sysfs(void)
924{
925 int error;
926
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
928 if (acpi_disabled || acpi_noirq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400929 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931 error = sysdev_class_register(&irqrouter_sysdev_class);
932 if (!error)
933 error = sysdev_register(&device_irqrouter);
934
Patrick Mocheld550d982006-06-27 00:41:40 -0400935 return error;
Len Brown4be44fc2005-08-05 00:44:28 -0400936}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
938device_initcall(irqrouter_init_sysfs);
939
Len Brown4be44fc2005-08-05 00:44:28 -0400940static int __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942
943 if (acpi_noirq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400944 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945
946 acpi_link.count = 0;
947 INIT_LIST_HEAD(&acpi_link.entries);
948
949 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400950 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951
Patrick Mocheld550d982006-06-27 00:41:40 -0400952 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
955subsys_initcall(acpi_pci_link_init);