blob: 8920e8c6e246dba49a30da6c2539dae11ec69316 [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>
41
42#include <acpi/acpi_bus.h>
43#include <acpi/acpi_drivers.h>
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#define _COMPONENT ACPI_PCI_COMPONENT
Len Brown4be44fc2005-08-05 00:44:28 -040046ACPI_MODULE_NAME("pci_link")
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
48#define ACPI_PCI_LINK_HID "PNP0C0F"
49#define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
50#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
51#define ACPI_PCI_LINK_FILE_INFO "info"
52#define ACPI_PCI_LINK_FILE_STATUS "state"
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#define ACPI_PCI_LINK_MAX_POSSIBLE 16
Len Brown4be44fc2005-08-05 00:44:28 -040054static int acpi_pci_link_add(struct acpi_device *device);
55static int acpi_pci_link_remove(struct acpi_device *device, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
57static struct acpi_driver acpi_pci_link_driver = {
Len Brown4be44fc2005-08-05 00:44:28 -040058 .name = ACPI_PCI_LINK_DRIVER_NAME,
59 .class = ACPI_PCI_LINK_CLASS,
60 .ids = ACPI_PCI_LINK_HID,
61 .ops = {
62 .add = acpi_pci_link_add,
63 .remove = acpi_pci_link_remove,
64 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
David Shaohua Li87bec662005-07-27 23:02:00 -040067/*
68 * If a link is initialized, we never change its active and initialized
69 * later even the link is disable. Instead, we just repick the active irq
70 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070071struct acpi_pci_link_irq {
Len Brown4be44fc2005-08-05 00:44:28 -040072 u8 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040073 u8 triggering; /* All IRQs */
74 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040075 u8 resource_type;
76 u8 possible_count;
77 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
78 u8 initialized:1;
79 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
81
82struct acpi_pci_link {
Len Brown4be44fc2005-08-05 00:44:28 -040083 struct list_head node;
84 struct acpi_device *device;
85 acpi_handle handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 struct acpi_pci_link_irq irq;
Len Brown4be44fc2005-08-05 00:44:28 -040087 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088};
89
90static struct {
Len Brown4be44fc2005-08-05 00:44:28 -040091 int count;
92 struct list_head entries;
93} acpi_link;
David Shaohua Li87bec662005-07-27 23:02:00 -040094DECLARE_MUTEX(acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/* --------------------------------------------------------------------------
97 PCI Link Device Management
98 -------------------------------------------------------------------------- */
99
100/*
101 * set context (link) possible list from resource list
102 */
103static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400104acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
Len Brown4be44fc2005-08-05 00:44:28 -0400106 struct acpi_pci_link *link = (struct acpi_pci_link *)context;
107 u32 i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
110
Len Browneca008c2005-09-22 00:25:18 -0400111 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400112 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return_ACPI_STATUS(AE_OK);
Bob Moore50eca3e2005-09-30 19:03:00 -0400114 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400115 {
116 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400117 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400118 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
119 "Blank IRQ resource\n"));
120 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 }
Len Brown4be44fc2005-08-05 00:44:28 -0400122 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400123 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400124 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
125 if (!p->interrupts[i]) {
126 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
127 "Invalid IRQ %d\n",
128 p->interrupts[i]));
129 continue;
130 }
131 link->irq.possible[i] = p->interrupts[i];
132 link->irq.possible_count++;
133 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400134 link->irq.triggering = p->triggering;
135 link->irq.polarity = p->polarity;
136 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400137 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400139 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400140 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400141 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400142 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400143 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400144 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
145 "Blank EXT IRQ resource\n"));
146 return_ACPI_STATUS(AE_OK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 }
Len Brown4be44fc2005-08-05 00:44:28 -0400148 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400149 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400150 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
151 if (!p->interrupts[i]) {
152 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
153 "Invalid IRQ %d\n",
154 p->interrupts[i]));
155 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 Brown4be44fc2005-08-05 00:44:28 -0400166 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
167 "Resource is not an IRQ entry\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return_ACPI_STATUS(AE_OK);
169 }
170
171 return_ACPI_STATUS(AE_CTRL_TERMINATE);
172}
173
Len Brown4be44fc2005-08-05 00:44:28 -0400174static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Len Brown4be44fc2005-08-05 00:44:28 -0400176 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
179
180 if (!link)
181 return_VALUE(-EINVAL);
182
183 status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400184 acpi_pci_link_check_possible, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 if (ACPI_FAILURE(status)) {
186 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
187 return_VALUE(-ENODEV);
188 }
189
Len Brown4be44fc2005-08-05 00:44:28 -0400190 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
191 "Found %d possible IRQs\n",
192 link->irq.possible_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
194 return_VALUE(0);
195}
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197static acpi_status
Len Brown4be44fc2005-08-05 00:44:28 -0400198acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Len Brown4be44fc2005-08-05 00:44:28 -0400200 int *irq = (int *)context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
203
Len Browneca008c2005-09-22 00:25:18 -0400204 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400205 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400206 {
207 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400208 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400209 /*
210 * IRQ descriptors may have no IRQ# bits set,
211 * particularly those those w/ _STA disabled
212 */
213 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
214 "Blank IRQ resource\n"));
215 return_ACPI_STATUS(AE_OK);
216 }
217 *irq = p->interrupts[0];
218 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400220 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400221 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400222 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400223 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400224 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400225 /*
226 * extended IRQ descriptors must
227 * return at least 1 IRQ
228 */
229 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
230 "Blank EXT IRQ resource\n"));
231 return_ACPI_STATUS(AE_OK);
232 }
233 *irq = p->interrupts[0];
234 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
Len Brownd4ec6c72006-01-26 17:23:38 -0500236 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 default:
Len Brownd4ec6c72006-01-26 17:23:38 -0500238 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Resource %d isn't an IRQ\n", resource->type));
239 case ACPI_RESOURCE_TYPE_END_TAG:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 return_ACPI_STATUS(AE_OK);
241 }
242 return_ACPI_STATUS(AE_CTRL_TERMINATE);
243}
244
245/*
246 * Run _CRS and set link->irq.active
247 *
248 * return value:
249 * 0 - success
250 * !0 - failure
251 */
Len Brown4be44fc2005-08-05 00:44:28 -0400252static int acpi_pci_link_get_current(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
Len Brown4be44fc2005-08-05 00:44:28 -0400254 int result = 0;
255 acpi_status status = AE_OK;
256 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
259
260 if (!link || !link->handle)
261 return_VALUE(-EINVAL);
262
263 link->irq.active = 0;
264
265 /* in practice, status disabled is meaningless, ignore it */
266 if (acpi_strict) {
267 /* Query _STA, set link->device->status */
268 result = acpi_bus_get_status(link->device);
269 if (result) {
Len Brown4be44fc2005-08-05 00:44:28 -0400270 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
271 "Unable to read status\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 goto end;
273 }
274
275 if (!link->device->status.enabled) {
276 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
277 return_VALUE(0);
278 }
279 }
280
281 /*
282 * Query and parse _CRS to get the current IRQ assignment.
283 */
284
285 status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400286 acpi_pci_link_check_current, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (ACPI_FAILURE(status)) {
288 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
289 result = -ENODEV;
290 goto end;
291 }
292
293 if (acpi_strict && !irq) {
294 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_CRS returned 0\n"));
295 result = -ENODEV;
296 }
297
298 link->irq.active = irq;
299
300 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
301
Len Brown4be44fc2005-08-05 00:44:28 -0400302 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return_VALUE(result);
304}
305
Len Brown4be44fc2005-08-05 00:44:28 -0400306static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
Len Brown4be44fc2005-08-05 00:44:28 -0400308 int result = 0;
309 acpi_status status = AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 struct {
Len Brown4be44fc2005-08-05 00:44:28 -0400311 struct acpi_resource res;
312 struct acpi_resource end;
313 } *resource;
314 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 ACPI_FUNCTION_TRACE("acpi_pci_link_set");
317
318 if (!link || !irq)
319 return_VALUE(-EINVAL);
320
Dave Jonesa64882e2005-12-12 00:37:40 -0800321 resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC);
Len Brown4be44fc2005-08-05 00:44:28 -0400322 if (!resource)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return_VALUE(-ENOMEM);
324
Len Brown4be44fc2005-08-05 00:44:28 -0400325 memset(resource, 0, sizeof(*resource) + 1);
326 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 buffer.pointer = resource;
328
Len Brown4be44fc2005-08-05 00:44:28 -0400329 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400330 case ACPI_RESOURCE_TYPE_IRQ:
331 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400333 resource->res.data.irq.triggering = link->irq.triggering;
334 resource->res.data.irq.polarity =
335 link->irq.polarity;
336 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
337 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400338 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400340 resource->res.data.irq.sharable = ACPI_SHARED;
341 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 resource->res.data.irq.interrupts[0] = irq;
343 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400344
Bob Moore50eca3e2005-09-30 19:03:00 -0400345 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
346 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400348 resource->res.data.extended_irq.producer_consumer =
349 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400350 resource->res.data.extended_irq.triggering =
351 link->irq.triggering;
352 resource->res.data.extended_irq.polarity =
353 link->irq.polarity;
354 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
355 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400356 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400358 resource->res.data.irq.sharable = ACPI_SHARED;
359 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 resource->res.data.extended_irq.interrupts[0] = irq;
361 /* ignore resource_source, it's optional */
362 break;
363 default:
364 printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
365 result = -EINVAL;
366 goto end;
367
368 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400369 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
371 /* Attempt to set the resource */
372 status = acpi_set_current_resources(link->handle, &buffer);
373
374 /* check for total failure */
375 if (ACPI_FAILURE(status)) {
376 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
377 result = -ENODEV;
378 goto end;
379 }
380
381 /* Query _STA, set device->status */
382 result = acpi_bus_get_status(link->device);
383 if (result) {
384 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
385 goto end;
386 }
387 if (!link->device->status.enabled) {
388 printk(KERN_WARNING PREFIX
Len Brown4be44fc2005-08-05 00:44:28 -0400389 "%s [%s] disabled and referenced, BIOS bug.\n",
390 acpi_device_name(link->device),
391 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 }
393
394 /* Query _CRS, set link->irq.active */
395 result = acpi_pci_link_get_current(link);
396 if (result) {
397 goto end;
398 }
399
400 /*
401 * Is current setting not what we set?
402 * set link->irq.active
403 */
404 if (link->irq.active != irq) {
405 /*
406 * policy: when _CRS doesn't return what we just _SRS
407 * assume _SRS worked and override _CRS value.
408 */
Len Brown4be44fc2005-08-05 00:44:28 -0400409 printk(KERN_WARNING PREFIX
410 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
411 acpi_device_name(link->device),
412 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 link->irq.active = irq;
414 }
415
416 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400417
418 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 kfree(resource);
420 return_VALUE(result);
421}
422
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423/* --------------------------------------------------------------------------
424 PCI Link IRQ Management
425 -------------------------------------------------------------------------- */
426
427/*
428 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
429 * Link Devices to move the PIRQs around to minimize sharing.
430 *
431 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
432 * that the BIOS has already set to active. This is necessary because
433 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
434 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
435 * even if acpi_irq_nobalance is set.
436 *
437 * A tables of penalties avoids directing PCI interrupts to well known
438 * ISA IRQs. Boot params are available to over-ride the default table:
439 *
440 * List interrupts that are free for PCI use.
441 * acpi_irq_pci=n[,m]
442 *
443 * List interrupts that should not be used for PCI:
444 * acpi_irq_isa=n[,m]
445 *
446 * Note that PCI IRQ routers have a list of possible IRQs,
447 * which may not include the IRQs this table says are available.
448 *
449 * Since this heuristic can't tell the difference between a link
450 * that no device will attach to, vs. a link which may be shared
451 * by multiple active devices -- it is not optimal.
452 *
453 * If interrupt performance is that important, get an IO-APIC system
454 * with a pin dedicated to each device. Or for that matter, an MSI
455 * enabled system.
456 */
457
458#define ACPI_MAX_IRQS 256
459#define ACPI_MAX_ISA_IRQ 16
460
461#define PIRQ_PENALTY_PCI_AVAILABLE (0)
462#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
463#define PIRQ_PENALTY_PCI_USING (16*16*16)
464#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
465#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
466#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
467
468static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
469 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
470 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
471 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400472 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
473 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
475 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
476 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
477 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
478 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
479 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
480 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
481 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
482 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
483 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
484 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Len Brown4be44fc2005-08-05 00:44:28 -0400485 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486};
487
Len Brown4be44fc2005-08-05 00:44:28 -0400488int __init acpi_irq_penalty_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
Len Brown4be44fc2005-08-05 00:44:28 -0400490 struct list_head *node = NULL;
491 struct acpi_pci_link *link = NULL;
492 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
495
496 /*
497 * Update penalties to facilitate IRQ balancing.
498 */
499 list_for_each(node, &acpi_link.entries) {
500
501 link = list_entry(node, struct acpi_pci_link, node);
502 if (!link) {
Len Brown4be44fc2005-08-05 00:44:28 -0400503 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
504 "Invalid link context\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 continue;
506 }
507
508 /*
509 * reflect the possible and active irqs in the penalty table --
510 * useful for breaking ties.
511 */
512 if (link->irq.possible_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400513 int penalty =
514 PIRQ_PENALTY_PCI_POSSIBLE /
515 link->irq.possible_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 for (i = 0; i < link->irq.possible_count; i++) {
518 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
Len Brown4be44fc2005-08-05 00:44:28 -0400519 acpi_irq_penalty[link->irq.
520 possible[i]] +=
521 penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 }
523
524 } else if (link->irq.active) {
Len Brown4be44fc2005-08-05 00:44:28 -0400525 acpi_irq_penalty[link->irq.active] +=
526 PIRQ_PENALTY_PCI_POSSIBLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
528 }
529 /* Add a penalty for the SCI */
530 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
531
532 return_VALUE(0);
533}
534
535static int acpi_irq_balance; /* 0: static, 1: balance */
536
Len Brown4be44fc2005-08-05 00:44:28 -0400537static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Len Brown4be44fc2005-08-05 00:44:28 -0400539 int irq;
540 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
543
David Shaohua Li87bec662005-07-27 23:02:00 -0400544 if (link->irq.initialized) {
545 if (link->refcnt == 0)
546 /* This means the link is disabled but initialized */
547 acpi_pci_link_set(link, link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 return_VALUE(0);
David Shaohua Li87bec662005-07-27 23:02:00 -0400549 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551 /*
552 * search for active IRQ in list of possible IRQs.
553 */
554 for (i = 0; i < link->irq.possible_count; ++i) {
555 if (link->irq.active == link->irq.possible[i])
556 break;
557 }
558 /*
559 * forget active IRQ that is not in possible list
560 */
561 if (i == link->irq.possible_count) {
562 if (acpi_strict)
563 printk(KERN_WARNING PREFIX "_CRS %d not found"
Len Brown4be44fc2005-08-05 00:44:28 -0400564 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 link->irq.active = 0;
566 }
567
568 /*
569 * if active found, use it; else pick entry from end of possible list.
570 */
571 if (link->irq.active) {
572 irq = link->irq.active;
573 } else {
574 irq = link->irq.possible[link->irq.possible_count - 1];
575 }
576
577 if (acpi_irq_balance || !link->irq.active) {
578 /*
579 * Select the best IRQ. This is done in reverse to promote
580 * the use of IRQs 9, 10, 11, and >15.
581 */
582 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Len Brown4be44fc2005-08-05 00:44:28 -0400583 if (acpi_irq_penalty[irq] >
584 acpi_irq_penalty[link->irq.possible[i]])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 irq = link->irq.possible[i];
586 }
587 }
588
589 /* Attempt to enable the link device at this IRQ. */
590 if (acpi_pci_link_set(link, irq)) {
Len Brown4be44fc2005-08-05 00:44:28 -0400591 printk(PREFIX
592 "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
593 "Try pci=noacpi or acpi=off\n",
594 acpi_device_name(link->device),
595 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return_VALUE(-ENODEV);
597 } else {
598 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
Len Brown4be44fc2005-08-05 00:44:28 -0400599 printk(PREFIX "%s [%s] enabled at IRQ %d\n",
600 acpi_device_name(link->device),
601 acpi_device_bid(link->device), link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 }
603
604 link->irq.initialized = 1;
605
606 return_VALUE(0);
607}
608
609/*
David Shaohua Li87bec662005-07-27 23:02:00 -0400610 * acpi_pci_link_allocate_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 * success: return IRQ >= 0
612 * failure: return -1
613 */
614
615int
Len Brown4be44fc2005-08-05 00:44:28 -0400616acpi_pci_link_allocate_irq(acpi_handle handle,
617 int index,
Bob Moore50eca3e2005-09-30 19:03:00 -0400618 int *triggering, int *polarity, char **name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619{
Len Brown4be44fc2005-08-05 00:44:28 -0400620 int result = 0;
621 struct acpi_device *device = NULL;
622 struct acpi_pci_link *link = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
David Shaohua Li87bec662005-07-27 23:02:00 -0400624 ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626 result = acpi_bus_get_device(handle, &device);
627 if (result) {
628 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
629 return_VALUE(-1);
630 }
631
Len Brown4be44fc2005-08-05 00:44:28 -0400632 link = (struct acpi_pci_link *)acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (!link) {
634 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
635 return_VALUE(-1);
636 }
637
638 /* TBD: Support multiple index (IRQ) entries per Link Device */
639 if (index) {
640 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
641 return_VALUE(-1);
642 }
643
David Shaohua Li87bec662005-07-27 23:02:00 -0400644 down(&acpi_link_lock);
645 if (acpi_pci_link_allocate(link)) {
646 up(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 return_VALUE(-1);
David Shaohua Li87bec662005-07-27 23:02:00 -0400648 }
Len Brown4be44fc2005-08-05 00:44:28 -0400649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 if (!link->irq.active) {
David Shaohua Li87bec662005-07-27 23:02:00 -0400651 up(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
653 return_VALUE(-1);
654 }
Len Brown4be44fc2005-08-05 00:44:28 -0400655 link->refcnt++;
David Shaohua Li87bec662005-07-27 23:02:00 -0400656 up(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Bob Moore50eca3e2005-09-30 19:03:00 -0400658 if (triggering)
659 *triggering = link->irq.triggering;
660 if (polarity)
661 *polarity = link->irq.polarity;
Len Brown4be44fc2005-08-05 00:44:28 -0400662 if (name)
663 *name = acpi_device_bid(link->device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400664 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400665 "Link %s is referenced\n",
666 acpi_device_bid(link->device)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 return_VALUE(link->irq.active);
668}
669
David Shaohua Li87bec662005-07-27 23:02:00 -0400670/*
671 * We don't change link's irq information here. After it is reenabled, we
672 * continue use the info
673 */
Len Brown4be44fc2005-08-05 00:44:28 -0400674int acpi_pci_link_free_irq(acpi_handle handle)
David Shaohua Li87bec662005-07-27 23:02:00 -0400675{
Len Brown4be44fc2005-08-05 00:44:28 -0400676 struct acpi_device *device = NULL;
677 struct acpi_pci_link *link = NULL;
678 acpi_status result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679
David Shaohua Li87bec662005-07-27 23:02:00 -0400680 ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq");
681
682 result = acpi_bus_get_device(handle, &device);
683 if (result) {
684 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
685 return_VALUE(-1);
686 }
687
Len Brown4be44fc2005-08-05 00:44:28 -0400688 link = (struct acpi_pci_link *)acpi_driver_data(device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400689 if (!link) {
690 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
691 return_VALUE(-1);
692 }
693
694 down(&acpi_link_lock);
695 if (!link->irq.initialized) {
696 up(&acpi_link_lock);
697 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link isn't initialized\n"));
698 return_VALUE(-1);
699 }
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400700#ifdef FUTURE_USE
701 /*
702 * The Link reference count allows us to _DISable an unused link
703 * and suspend time, and set it again on resume.
704 * However, 2.6.12 still has irq_router.resume
705 * which blindly restores the link state.
706 * So we disable the reference count method
707 * to prevent duplicate acpi_pci_link_set()
708 * which would harm some systems
709 */
Len Brown4be44fc2005-08-05 00:44:28 -0400710 link->refcnt--;
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400711#endif
David Shaohua Li87bec662005-07-27 23:02:00 -0400712 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400713 "Link %s is dereferenced\n",
714 acpi_device_bid(link->device)));
David Shaohua Li87bec662005-07-27 23:02:00 -0400715
716 if (link->refcnt == 0) {
717 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
718 }
719 up(&acpi_link_lock);
720 return_VALUE(link->irq.active);
721}
Len Brown4be44fc2005-08-05 00:44:28 -0400722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723/* --------------------------------------------------------------------------
724 Driver Interface
725 -------------------------------------------------------------------------- */
726
Len Brown4be44fc2005-08-05 00:44:28 -0400727static int acpi_pci_link_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728{
Len Brown4be44fc2005-08-05 00:44:28 -0400729 int result = 0;
730 struct acpi_pci_link *link = NULL;
731 int i = 0;
732 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734 ACPI_FUNCTION_TRACE("acpi_pci_link_add");
735
736 if (!device)
737 return_VALUE(-EINVAL);
738
739 link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
740 if (!link)
741 return_VALUE(-ENOMEM);
742 memset(link, 0, sizeof(struct acpi_pci_link));
743
744 link->device = device;
745 link->handle = device->handle;
746 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
747 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
748 acpi_driver_data(device) = link;
749
David Shaohua Li87bec662005-07-27 23:02:00 -0400750 down(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 result = acpi_pci_link_get_possible(link);
752 if (result)
753 goto end;
754
755 /* query and set link->irq.active */
756 acpi_pci_link_get_current(link);
757
758 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400759 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 for (i = 0; i < link->irq.possible_count; i++) {
761 if (link->irq.active == link->irq.possible[i]) {
762 printk(" *%d", link->irq.possible[i]);
763 found = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400764 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 printk(" %d", link->irq.possible[i]);
766 }
767
768 printk(")");
769
770 if (!found)
771 printk(" *%d", link->irq.active);
772
Len Brown4be44fc2005-08-05 00:44:28 -0400773 if (!link->device->status.enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 printk(", disabled.");
775
776 printk("\n");
777
778 /* TBD: Acquire/release lock */
779 list_add_tail(&link->node, &acpi_link.entries);
780 acpi_link.count++;
781
Len Brown4be44fc2005-08-05 00:44:28 -0400782 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 /* disable all links -- to be activated on use */
784 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
David Shaohua Li87bec662005-07-27 23:02:00 -0400785 up(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 if (result)
788 kfree(link);
789
790 return_VALUE(result);
791}
792
Len Brown4be44fc2005-08-05 00:44:28 -0400793static int acpi_pci_link_resume(struct acpi_pci_link *link)
Linus Torvalds697a2d62005-08-01 12:37:54 -0700794{
795 ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
796
797 if (link->refcnt && link->irq.active && link->irq.initialized)
798 return_VALUE(acpi_pci_link_set(link, link->irq.active));
799 else
800 return_VALUE(0);
801}
802
David Shaohua Li11e981f2005-08-03 23:46:33 -0400803/*
804 * FIXME: this is a workaround to avoid nasty warning. It will be removed
805 * after every device calls pci_disable_device in .resume.
806 */
807int acpi_in_resume;
Len Brown4be44fc2005-08-05 00:44:28 -0400808static int irqrouter_resume(struct sys_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809{
Len Brown4be44fc2005-08-05 00:44:28 -0400810 struct list_head *node = NULL;
811 struct acpi_pci_link *link = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
Linus Torvalds697a2d62005-08-01 12:37:54 -0700813 ACPI_FUNCTION_TRACE("irqrouter_resume");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814
Linus Torvalds56035092006-06-19 18:05:09 -0700815 /* Make sure SCI is enabled again (Apple firmware bug?) */
816 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK);
817
David Shaohua Li11e981f2005-08-03 23:46:33 -0400818 acpi_in_resume = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 list_for_each(node, &acpi_link.entries) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 link = list_entry(node, struct acpi_pci_link, node);
821 if (!link) {
David Shaohua Li87bec662005-07-27 23:02:00 -0400822 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
Len Brown4be44fc2005-08-05 00:44:28 -0400823 "Invalid link context\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 continue;
825 }
Linus Torvalds697a2d62005-08-01 12:37:54 -0700826 acpi_pci_link_resume(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 }
David Shaohua Li11e981f2005-08-03 23:46:33 -0400828 acpi_in_resume = 0;
Linus Torvalds697a2d62005-08-01 12:37:54 -0700829 return_VALUE(0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
Len Brown4be44fc2005-08-05 00:44:28 -0400832static int acpi_pci_link_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833{
834 struct acpi_pci_link *link = NULL;
835
836 ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
837
838 if (!device || !acpi_driver_data(device))
839 return_VALUE(-EINVAL);
840
Len Brown4be44fc2005-08-05 00:44:28 -0400841 link = (struct acpi_pci_link *)acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
David Shaohua Li87bec662005-07-27 23:02:00 -0400843 down(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 list_del(&link->node);
David Shaohua Li87bec662005-07-27 23:02:00 -0400845 up(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847 kfree(link);
848
849 return_VALUE(0);
850}
851
852/*
853 * modify acpi_irq_penalty[] from cmdline
854 */
855static int __init acpi_irq_penalty_update(char *str, int used)
856{
857 int i;
858
859 for (i = 0; i < 16; i++) {
860 int retval;
861 int irq;
862
Len Brown4be44fc2005-08-05 00:44:28 -0400863 retval = get_option(&str, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
865 if (!retval)
866 break; /* no number found */
867
868 if (irq < 0)
869 continue;
Len Brown4be44fc2005-08-05 00:44:28 -0400870
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 if (irq >= ACPI_MAX_IRQS)
872 continue;
873
874 if (used)
875 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
876 else
877 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
878
879 if (retval != 2) /* no next number */
880 break;
881 }
882 return 1;
883}
884
885/*
886 * We'd like PNP to call this routine for the
887 * single ISA_USED value for each legacy device.
888 * But instead it calls us with each POSSIBLE setting.
889 * There is no ISA_POSSIBLE weight, so we simply use
890 * the (small) PCI_USING penalty.
891 */
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500892void acpi_penalize_isa_irq(int irq, int active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893{
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500894 if (active)
895 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
896 else
897 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898}
899
900/*
901 * Over-ride default table to reserve additional IRQs for use by ISA
902 * e.g. acpi_irq_isa=5
903 * Useful for telling ACPI how not to interfere with your ISA sound card.
904 */
905static int __init acpi_irq_isa(char *str)
906{
907 return acpi_irq_penalty_update(str, 1);
908}
Len Brown4be44fc2005-08-05 00:44:28 -0400909
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910__setup("acpi_irq_isa=", acpi_irq_isa);
911
912/*
913 * Over-ride default table to free additional IRQs for use by PCI
914 * e.g. acpi_irq_pci=7,15
915 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
916 */
917static int __init acpi_irq_pci(char *str)
918{
919 return acpi_irq_penalty_update(str, 0);
920}
Len Brown4be44fc2005-08-05 00:44:28 -0400921
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922__setup("acpi_irq_pci=", acpi_irq_pci);
923
924static int __init acpi_irq_nobalance_set(char *str)
925{
926 acpi_irq_balance = 0;
927 return 1;
928}
Len Brown4be44fc2005-08-05 00:44:28 -0400929
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
931
932int __init acpi_irq_balance_set(char *str)
933{
934 acpi_irq_balance = 1;
935 return 1;
936}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Len Brown4be44fc2005-08-05 00:44:28 -0400938__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
David Shaohua Li87bec662005-07-27 23:02:00 -0400940/* FIXME: we will remove this interface after all drivers call pci_disable_device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941static struct sysdev_class irqrouter_sysdev_class = {
Len Brown4be44fc2005-08-05 00:44:28 -0400942 set_kset_name("irqrouter"),
943 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944};
945
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946static struct sys_device device_irqrouter = {
Len Brown4be44fc2005-08-05 00:44:28 -0400947 .id = 0,
948 .cls = &irqrouter_sysdev_class,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949};
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951static int __init irqrouter_init_sysfs(void)
952{
953 int error;
954
955 ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
956
957 if (acpi_disabled || acpi_noirq)
958 return_VALUE(0);
959
960 error = sysdev_class_register(&irqrouter_sysdev_class);
961 if (!error)
962 error = sysdev_register(&device_irqrouter);
963
964 return_VALUE(error);
Len Brown4be44fc2005-08-05 00:44:28 -0400965}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966
967device_initcall(irqrouter_init_sysfs);
968
Len Brown4be44fc2005-08-05 00:44:28 -0400969static int __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970{
971 ACPI_FUNCTION_TRACE("acpi_pci_link_init");
972
973 if (acpi_noirq)
974 return_VALUE(0);
975
976 acpi_link.count = 0;
977 INIT_LIST_HEAD(&acpi_link.entries);
978
979 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
980 return_VALUE(-ENODEV);
981
982 return_VALUE(0);
983}
984
985subsys_initcall(acpi_pci_link_init);