blob: 16e0f9d3d17cb49a25cf76f68e04ff9042ece566 [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
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -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"
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070052#define ACPI_PCI_LINK_MAX_POSSIBLE 16
53
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
Thomas Renninger1ba90e32007-07-23 14:44:41 +020057static struct acpi_device_id link_device_ids[] = {
58 {"PNP0C0F", 0},
59 {"", 0},
60};
61MODULE_DEVICE_TABLE(acpi, link_device_ids);
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063static struct acpi_driver acpi_pci_link_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050064 .name = "pci_link",
Len Brown4be44fc2005-08-05 00:44:28 -040065 .class = ACPI_PCI_LINK_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020066 .ids = link_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040067 .ops = {
68 .add = acpi_pci_link_add,
69 .remove = acpi_pci_link_remove,
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070070 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070071};
72
David Shaohua Li87bec662005-07-27 23:02:00 -040073/*
74 * If a link is initialized, we never change its active and initialized
75 * later even the link is disable. Instead, we just repick the active irq
76 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070077struct acpi_pci_link_irq {
Len Brown4be44fc2005-08-05 00:44:28 -040078 u8 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040079 u8 triggering; /* All IRQs */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070080 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040081 u8 resource_type;
82 u8 possible_count;
83 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
84 u8 initialized:1;
85 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086};
87
88struct acpi_pci_link {
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070089 struct list_head list;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070090 struct acpi_device *device;
91 struct acpi_pci_link_irq irq;
92 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093};
94
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070095static LIST_HEAD(acpi_link_list);
Adrian Bunke5685b92007-10-24 18:24:42 +020096static DEFINE_MUTEX(acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098/* --------------------------------------------------------------------------
99 PCI Link Device Management
100 -------------------------------------------------------------------------- */
101
102/*
103 * set context (link) possible list from resource list
104 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700105static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
106 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200108 struct acpi_pci_link *link = context;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700109 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
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:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600113 case ACPI_RESOURCE_TYPE_END_TAG:
Patrick Mocheld550d982006-06-27 00:41:40 -0400114 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400115 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400116 {
117 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400118 if (!p || !p->interrupt_count) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600119 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
120 "Blank _PRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400121 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 }
Len Brown4be44fc2005-08-05 00:44:28 -0400123 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400124 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400125 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
126 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600127 printk(KERN_WARNING PREFIX
128 "Invalid _PRS 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
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600146 "Blank _PRS 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]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600153 printk(KERN_WARNING PREFIX
154 "Invalid _PRS IRQ %d\n",
155 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400156 continue;
157 }
158 link->irq.possible[i] = p->interrupts[i];
159 link->irq.possible_count++;
160 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400161 link->irq.triggering = p->triggering;
162 link->irq.polarity = p->polarity;
163 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400164 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600167 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
168 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400169 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 }
171
Patrick Mocheld550d982006-06-27 00:41:40 -0400172 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173}
174
Len Brown4be44fc2005-08-05 00:44:28 -0400175static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
Len Brown4be44fc2005-08-05 00:44:28 -0400177 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Patrick Mochel67a71362006-05-19 16:54:42 -0400179 status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400180 acpi_pci_link_check_possible, link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400182 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400183 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185
Len Brown4be44fc2005-08-05 00:44:28 -0400186 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
187 "Found %d possible IRQs\n",
188 link->irq.possible_count));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
Patrick Mocheld550d982006-06-27 00:41:40 -0400190 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700193static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
194 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700196 int *irq = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Len Browneca008c2005-09-22 00:25:18 -0400198 switch (resource->type) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600199 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
200 case ACPI_RESOURCE_TYPE_END_TAG:
201 return AE_OK;
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,
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600211 "Blank _CRS 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
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600227 "Blank _CRS 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:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600235 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
236 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400237 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 }
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600239
Patrick Mocheld550d982006-06-27 00:41:40 -0400240 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241}
242
243/*
244 * Run _CRS and set link->irq.active
245 *
246 * return value:
247 * 0 - success
248 * !0 - failure
249 */
Len Brown4be44fc2005-08-05 00:44:28 -0400250static int acpi_pci_link_get_current(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
Len Brown4be44fc2005-08-05 00:44:28 -0400252 int result = 0;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700253 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400254 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 link->irq.active = 0;
257
258 /* in practice, status disabled is meaningless, ignore it */
259 if (acpi_strict) {
260 /* Query _STA, set link->device->status */
261 result = acpi_bus_get_status(link->device);
262 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400263 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 goto end;
265 }
266
267 if (!link->device->status.enabled) {
268 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400269 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
271 }
272
273 /*
274 * Query and parse _CRS to get the current IRQ assignment.
275 */
276
Patrick Mochel67a71362006-05-19 16:54:42 -0400277 status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
Len Brown4be44fc2005-08-05 00:44:28 -0400278 acpi_pci_link_check_current, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400280 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 result = -ENODEV;
282 goto end;
283 }
284
285 if (acpi_strict && !irq) {
Len Brown64684632006-06-26 23:41:38 -0400286 printk(KERN_ERR PREFIX "_CRS returned 0\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 result = -ENODEV;
288 }
289
290 link->irq.active = irq;
291
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
293
Len Brown4be44fc2005-08-05 00:44:28 -0400294 end:
Patrick Mocheld550d982006-06-27 00:41:40 -0400295 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
Len Brown4be44fc2005-08-05 00:44:28 -0400298static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700300 int result;
301 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 struct {
Len Brown4be44fc2005-08-05 00:44:28 -0400303 struct acpi_resource res;
304 struct acpi_resource end;
305 } *resource;
306 struct acpi_buffer buffer = { 0, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307
Bjorn Helgaas6eca4b42009-02-17 14:00:50 -0700308 if (!irq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400309 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Burman Yan36bcbec2006-12-19 12:56:11 -0800311 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400312 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400313 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Len Brown4be44fc2005-08-05 00:44:28 -0400315 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 buffer.pointer = resource;
317
Len Brown4be44fc2005-08-05 00:44:28 -0400318 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400319 case ACPI_RESOURCE_TYPE_IRQ:
320 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400322 resource->res.data.irq.triggering = link->irq.triggering;
323 resource->res.data.irq.polarity =
324 link->irq.polarity;
325 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
326 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400327 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400329 resource->res.data.irq.sharable = ACPI_SHARED;
330 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 resource->res.data.irq.interrupts[0] = irq;
332 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400333
Bob Moore50eca3e2005-09-30 19:03:00 -0400334 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
335 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400337 resource->res.data.extended_irq.producer_consumer =
338 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400339 resource->res.data.extended_irq.triggering =
340 link->irq.triggering;
341 resource->res.data.extended_irq.polarity =
342 link->irq.polarity;
343 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
344 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400345 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400347 resource->res.data.irq.sharable = ACPI_SHARED;
348 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 resource->res.data.extended_irq.interrupts[0] = irq;
350 /* ignore resource_source, it's optional */
351 break;
352 default:
Len Brown64684632006-06-26 23:41:38 -0400353 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 result = -EINVAL;
355 goto end;
356
357 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400358 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359
360 /* Attempt to set the resource */
Patrick Mochel67a71362006-05-19 16:54:42 -0400361 status = acpi_set_current_resources(link->device->handle, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 /* check for total failure */
364 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400365 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 result = -ENODEV;
367 goto end;
368 }
369
370 /* Query _STA, set device->status */
371 result = acpi_bus_get_status(link->device);
372 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400373 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 goto end;
375 }
376 if (!link->device->status.enabled) {
Len Browncece9292006-06-26 23:04:31 -0400377 printk(KERN_WARNING PREFIX
378 "%s [%s] disabled and referenced, BIOS bug\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400379 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400380 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 }
382
383 /* Query _CRS, set link->irq.active */
384 result = acpi_pci_link_get_current(link);
385 if (result) {
386 goto end;
387 }
388
389 /*
390 * Is current setting not what we set?
391 * set link->irq.active
392 */
393 if (link->irq.active != irq) {
394 /*
395 * policy: when _CRS doesn't return what we just _SRS
396 * assume _SRS worked and override _CRS value.
397 */
Len Browncece9292006-06-26 23:04:31 -0400398 printk(KERN_WARNING PREFIX
399 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400400 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400401 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 link->irq.active = irq;
403 }
404
405 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400406
407 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 kfree(resource);
Patrick Mocheld550d982006-06-27 00:41:40 -0400409 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412/* --------------------------------------------------------------------------
413 PCI Link IRQ Management
414 -------------------------------------------------------------------------- */
415
416/*
417 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
418 * Link Devices to move the PIRQs around to minimize sharing.
419 *
420 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
421 * that the BIOS has already set to active. This is necessary because
422 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
423 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
424 * even if acpi_irq_nobalance is set.
425 *
426 * A tables of penalties avoids directing PCI interrupts to well known
427 * ISA IRQs. Boot params are available to over-ride the default table:
428 *
429 * List interrupts that are free for PCI use.
430 * acpi_irq_pci=n[,m]
431 *
432 * List interrupts that should not be used for PCI:
433 * acpi_irq_isa=n[,m]
434 *
435 * Note that PCI IRQ routers have a list of possible IRQs,
436 * which may not include the IRQs this table says are available.
437 *
438 * Since this heuristic can't tell the difference between a link
439 * that no device will attach to, vs. a link which may be shared
440 * by multiple active devices -- it is not optimal.
441 *
442 * If interrupt performance is that important, get an IO-APIC system
443 * with a pin dedicated to each device. Or for that matter, an MSI
444 * enabled system.
445 */
446
447#define ACPI_MAX_IRQS 256
448#define ACPI_MAX_ISA_IRQ 16
449
450#define PIRQ_PENALTY_PCI_AVAILABLE (0)
451#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
452#define PIRQ_PENALTY_PCI_USING (16*16*16)
453#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
454#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
455#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
456
457static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
458 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
459 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
460 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400461 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
462 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
465 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
466 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
467 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
468 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
469 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700470 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
471 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
472 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
473 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Len Brown4be44fc2005-08-05 00:44:28 -0400474 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475};
476
Len Brown4be44fc2005-08-05 00:44:28 -0400477int __init acpi_irq_penalty_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700479 struct acpi_pci_link *link;
480 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 /*
483 * Update penalties to facilitate IRQ balancing.
484 */
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700485 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 /*
488 * reflect the possible and active irqs in the penalty table --
489 * useful for breaking ties.
490 */
491 if (link->irq.possible_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400492 int penalty =
493 PIRQ_PENALTY_PCI_POSSIBLE /
494 link->irq.possible_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 for (i = 0; i < link->irq.possible_count; i++) {
497 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
Len Brown4be44fc2005-08-05 00:44:28 -0400498 acpi_irq_penalty[link->irq.
499 possible[i]] +=
500 penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 }
502
503 } else if (link->irq.active) {
Len Brown4be44fc2005-08-05 00:44:28 -0400504 acpi_irq_penalty[link->irq.active] +=
505 PIRQ_PENALTY_PCI_POSSIBLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 }
507 }
508 /* Add a penalty for the SCI */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300509 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
Patrick Mocheld550d982006-06-27 00:41:40 -0400510 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511}
512
Bjorn Helgaas32836252008-11-05 16:17:52 -0700513static int acpi_irq_balance = -1; /* 0: static, 1: balance */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
Len Brown4be44fc2005-08-05 00:44:28 -0400515static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516{
Len Brown4be44fc2005-08-05 00:44:28 -0400517 int irq;
518 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
David Shaohua Li87bec662005-07-27 23:02:00 -0400520 if (link->irq.initialized) {
521 if (link->refcnt == 0)
522 /* This means the link is disabled but initialized */
523 acpi_pci_link_set(link, link->irq.active);
Patrick Mocheld550d982006-06-27 00:41:40 -0400524 return 0;
David Shaohua Li87bec662005-07-27 23:02:00 -0400525 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
527 /*
528 * search for active IRQ in list of possible IRQs.
529 */
530 for (i = 0; i < link->irq.possible_count; ++i) {
531 if (link->irq.active == link->irq.possible[i])
532 break;
533 }
534 /*
535 * forget active IRQ that is not in possible list
536 */
537 if (i == link->irq.possible_count) {
538 if (acpi_strict)
Len Browncece9292006-06-26 23:04:31 -0400539 printk(KERN_WARNING PREFIX "_CRS %d not found"
540 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 link->irq.active = 0;
542 }
543
544 /*
545 * if active found, use it; else pick entry from end of possible list.
546 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700547 if (link->irq.active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 irq = link->irq.active;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700549 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 irq = link->irq.possible[link->irq.possible_count - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
552 if (acpi_irq_balance || !link->irq.active) {
553 /*
554 * Select the best IRQ. This is done in reverse to promote
555 * the use of IRQs 9, 10, 11, and >15.
556 */
557 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Len Brown4be44fc2005-08-05 00:44:28 -0400558 if (acpi_irq_penalty[irq] >
559 acpi_irq_penalty[link->irq.possible[i]])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 irq = link->irq.possible[i];
561 }
562 }
563
564 /* Attempt to enable the link device at this IRQ. */
565 if (acpi_pci_link_set(link, irq)) {
Len Brown64684632006-06-26 23:41:38 -0400566 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
567 "Try pci=noacpi or acpi=off\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400568 acpi_device_name(link->device),
Len Brown64684632006-06-26 23:41:38 -0400569 acpi_device_bid(link->device));
Patrick Mocheld550d982006-06-27 00:41:40 -0400570 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 } else {
572 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
Frank Seidel4d939152009-02-04 17:03:07 +0100573 printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400574 acpi_device_name(link->device),
575 acpi_device_bid(link->device), link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 }
577
578 link->irq.initialized = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400579 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
582/*
David Shaohua Li87bec662005-07-27 23:02:00 -0400583 * acpi_pci_link_allocate_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 * success: return IRQ >= 0
585 * failure: return -1
586 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700587int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
588 int *polarity, char **name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700590 int result;
591 struct acpi_device *device;
592 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 result = acpi_bus_get_device(handle, &device);
595 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400596 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400597 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 }
599
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200600 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400602 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400603 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 }
605
606 /* TBD: Support multiple index (IRQ) entries per Link Device */
607 if (index) {
Len Brown64684632006-06-26 23:41:38 -0400608 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
Patrick Mocheld550d982006-06-27 00:41:40 -0400609 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 }
611
Ingo Molnar36e43092006-04-27 05:25:00 -0400612 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400613 if (acpi_pci_link_allocate(link)) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400614 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400615 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400616 }
Len Brown4be44fc2005-08-05 00:44:28 -0400617
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 if (!link->irq.active) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400619 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400620 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400621 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 }
Len Brown4be44fc2005-08-05 00:44:28 -0400623 link->refcnt++;
Ingo Molnar36e43092006-04-27 05:25:00 -0400624 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
Bob Moore50eca3e2005-09-30 19:03:00 -0400626 if (triggering)
627 *triggering = link->irq.triggering;
628 if (polarity)
629 *polarity = link->irq.polarity;
Len Brown4be44fc2005-08-05 00:44:28 -0400630 if (name)
631 *name = acpi_device_bid(link->device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400632 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400633 "Link %s is referenced\n",
634 acpi_device_bid(link->device)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400635 return (link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636}
637
David Shaohua Li87bec662005-07-27 23:02:00 -0400638/*
639 * We don't change link's irq information here. After it is reenabled, we
640 * continue use the info
641 */
Len Brown4be44fc2005-08-05 00:44:28 -0400642int acpi_pci_link_free_irq(acpi_handle handle)
David Shaohua Li87bec662005-07-27 23:02:00 -0400643{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700644 struct acpi_device *device;
645 struct acpi_pci_link *link;
Len Brown4be44fc2005-08-05 00:44:28 -0400646 acpi_status result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
David Shaohua Li87bec662005-07-27 23:02:00 -0400648 result = acpi_bus_get_device(handle, &device);
649 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400650 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400651 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400652 }
653
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200654 link = acpi_driver_data(device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400655 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400656 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400657 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400658 }
659
Ingo Molnar36e43092006-04-27 05:25:00 -0400660 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400661 if (!link->irq.initialized) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400662 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400663 printk(KERN_ERR PREFIX "Link isn't initialized\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400664 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400665 }
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400666#ifdef FUTURE_USE
667 /*
668 * The Link reference count allows us to _DISable an unused link
669 * and suspend time, and set it again on resume.
670 * However, 2.6.12 still has irq_router.resume
671 * which blindly restores the link state.
672 * So we disable the reference count method
673 * to prevent duplicate acpi_pci_link_set()
674 * which would harm some systems
675 */
Len Brown4be44fc2005-08-05 00:44:28 -0400676 link->refcnt--;
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400677#endif
David Shaohua Li87bec662005-07-27 23:02:00 -0400678 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400679 "Link %s is dereferenced\n",
680 acpi_device_bid(link->device)));
David Shaohua Li87bec662005-07-27 23:02:00 -0400681
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700682 if (link->refcnt == 0)
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700683 acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700684
Ingo Molnar36e43092006-04-27 05:25:00 -0400685 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400686 return (link->irq.active);
David Shaohua Li87bec662005-07-27 23:02:00 -0400687}
Len Brown4be44fc2005-08-05 00:44:28 -0400688
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689/* --------------------------------------------------------------------------
690 Driver Interface
691 -------------------------------------------------------------------------- */
692
Len Brown4be44fc2005-08-05 00:44:28 -0400693static int acpi_pci_link_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700695 int result;
696 struct acpi_pci_link *link;
697 int i;
Len Brown4be44fc2005-08-05 00:44:28 -0400698 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
Burman Yan36bcbec2006-12-19 12:56:11 -0800700 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400702 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704 link->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
706 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700707 device->driver_data = link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
Ingo Molnar36e43092006-04-27 05:25:00 -0400709 mutex_lock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 result = acpi_pci_link_get_possible(link);
711 if (result)
712 goto end;
713
714 /* query and set link->irq.active */
715 acpi_pci_link_get_current(link);
716
Dan Aloni0dc070b2007-07-09 11:33:18 -0700717 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400718 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 for (i = 0; i < link->irq.possible_count; i++) {
720 if (link->irq.active == link->irq.possible[i]) {
721 printk(" *%d", link->irq.possible[i]);
722 found = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400723 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 printk(" %d", link->irq.possible[i]);
725 }
726
727 printk(")");
728
729 if (!found)
730 printk(" *%d", link->irq.active);
731
Len Brown4be44fc2005-08-05 00:44:28 -0400732 if (!link->device->status.enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 printk(", disabled.");
734
735 printk("\n");
736
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700737 list_add_tail(&link->list, &acpi_link_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738
Len Brown4be44fc2005-08-05 00:44:28 -0400739 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 /* disable all links -- to be activated on use */
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700741 acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
Ingo Molnar36e43092006-04-27 05:25:00 -0400742 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743
744 if (result)
745 kfree(link);
746
Patrick Mocheld550d982006-06-27 00:41:40 -0400747 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748}
749
Len Brown4be44fc2005-08-05 00:44:28 -0400750static int acpi_pci_link_resume(struct acpi_pci_link *link)
Linus Torvalds697a2d62005-08-01 12:37:54 -0700751{
Linus Torvalds697a2d62005-08-01 12:37:54 -0700752 if (link->refcnt && link->irq.active && link->irq.initialized)
Patrick Mocheld550d982006-06-27 00:41:40 -0400753 return (acpi_pci_link_set(link, link->irq.active));
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700754
755 return 0;
Linus Torvalds697a2d62005-08-01 12:37:54 -0700756}
757
Len Brown4be44fc2005-08-05 00:44:28 -0400758static int irqrouter_resume(struct sys_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700760 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700762 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds697a2d62005-08-01 12:37:54 -0700763 acpi_pci_link_resume(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400765 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
Len Brown4be44fc2005-08-05 00:44:28 -0400768static int acpi_pci_link_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700770 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200772 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Ingo Molnar36e43092006-04-27 05:25:00 -0400774 mutex_lock(&acpi_link_lock);
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700775 list_del(&link->list);
Ingo Molnar36e43092006-04-27 05:25:00 -0400776 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778 kfree(link);
Patrick Mocheld550d982006-06-27 00:41:40 -0400779 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
782/*
783 * modify acpi_irq_penalty[] from cmdline
784 */
785static int __init acpi_irq_penalty_update(char *str, int used)
786{
787 int i;
788
789 for (i = 0; i < 16; i++) {
790 int retval;
791 int irq;
792
Len Brown4be44fc2005-08-05 00:44:28 -0400793 retval = get_option(&str, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794
795 if (!retval)
796 break; /* no number found */
797
798 if (irq < 0)
799 continue;
Len Brown4be44fc2005-08-05 00:44:28 -0400800
Bjorn Helgaasfa46d352008-08-01 15:58:17 -0600801 if (irq >= ARRAY_SIZE(acpi_irq_penalty))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 continue;
803
804 if (used)
805 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
806 else
807 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
808
809 if (retval != 2) /* no next number */
810 break;
811 }
812 return 1;
813}
814
815/*
816 * We'd like PNP to call this routine for the
817 * single ISA_USED value for each legacy device.
818 * But instead it calls us with each POSSIBLE setting.
819 * There is no ISA_POSSIBLE weight, so we simply use
820 * the (small) PCI_USING penalty.
821 */
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500822void acpi_penalize_isa_irq(int irq, int active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823{
Bjorn Helgaasfa46d352008-08-01 15:58:17 -0600824 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
825 if (active)
826 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
827 else
828 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
829 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830}
831
832/*
833 * Over-ride default table to reserve additional IRQs for use by ISA
834 * e.g. acpi_irq_isa=5
835 * Useful for telling ACPI how not to interfere with your ISA sound card.
836 */
837static int __init acpi_irq_isa(char *str)
838{
839 return acpi_irq_penalty_update(str, 1);
840}
Len Brown4be44fc2005-08-05 00:44:28 -0400841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842__setup("acpi_irq_isa=", acpi_irq_isa);
843
844/*
845 * Over-ride default table to free additional IRQs for use by PCI
846 * e.g. acpi_irq_pci=7,15
847 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
848 */
849static int __init acpi_irq_pci(char *str)
850{
851 return acpi_irq_penalty_update(str, 0);
852}
Len Brown4be44fc2005-08-05 00:44:28 -0400853
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854__setup("acpi_irq_pci=", acpi_irq_pci);
855
856static int __init acpi_irq_nobalance_set(char *str)
857{
858 acpi_irq_balance = 0;
859 return 1;
860}
Len Brown4be44fc2005-08-05 00:44:28 -0400861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
863
Roel Kluin8a383ef2008-12-09 20:45:30 +0100864static int __init acpi_irq_balance_set(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865{
866 acpi_irq_balance = 1;
867 return 1;
868}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Len Brown4be44fc2005-08-05 00:44:28 -0400870__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
David Shaohua Li87bec662005-07-27 23:02:00 -0400872/* FIXME: we will remove this interface after all drivers call pci_disable_device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873static struct sysdev_class irqrouter_sysdev_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100874 .name = "irqrouter",
Len Brown4be44fc2005-08-05 00:44:28 -0400875 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876};
877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878static struct sys_device device_irqrouter = {
Len Brown4be44fc2005-08-05 00:44:28 -0400879 .id = 0,
880 .cls = &irqrouter_sysdev_class,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881};
882
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883static int __init irqrouter_init_sysfs(void)
884{
885 int error;
886
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 if (acpi_disabled || acpi_noirq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400888 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 error = sysdev_class_register(&irqrouter_sysdev_class);
891 if (!error)
892 error = sysdev_register(&device_irqrouter);
893
Patrick Mocheld550d982006-06-27 00:41:40 -0400894 return error;
Len Brown4be44fc2005-08-05 00:44:28 -0400895}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896
897device_initcall(irqrouter_init_sysfs);
898
Len Brown4be44fc2005-08-05 00:44:28 -0400899static int __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 if (acpi_noirq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400902 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
Bjorn Helgaas32836252008-11-05 16:17:52 -0700904 if (acpi_irq_balance == -1) {
905 /* no command line switch: enable balancing in IOAPIC mode */
906 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
907 acpi_irq_balance = 1;
908 else
909 acpi_irq_balance = 0;
910 }
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400913 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914
Patrick Mocheld550d982006-06-27 00:41:40 -0400915 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916}
917
918subsys_initcall(acpi_pci_link_init);