blob: 04b0f007c9b79e5d5708aeed1529069e85afb45e [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
Len Browna192a952009-07-28 16:45:54 -040046#define PREFIX "ACPI: "
47
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070048#define _COMPONENT ACPI_PCI_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050049ACPI_MODULE_NAME("pci_link");
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#define ACPI_PCI_LINK_CLASS "pci_irq_routing"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define ACPI_PCI_LINK_DEVICE_NAME "PCI Interrupt Link"
52#define ACPI_PCI_LINK_FILE_INFO "info"
53#define ACPI_PCI_LINK_FILE_STATUS "state"
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070054#define ACPI_PCI_LINK_MAX_POSSIBLE 16
55
Len Brown4be44fc2005-08-05 00:44:28 -040056static int acpi_pci_link_add(struct acpi_device *device);
57static int acpi_pci_link_remove(struct acpi_device *device, int type);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Márton Némethc97adf92010-01-10 17:15:36 +010059static const struct acpi_device_id link_device_ids[] = {
Thomas Renninger1ba90e32007-07-23 14:44:41 +020060 {"PNP0C0F", 0},
61 {"", 0},
62};
63MODULE_DEVICE_TABLE(acpi, link_device_ids);
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065static struct acpi_driver acpi_pci_link_driver = {
Len Brownc2b67052007-02-12 23:33:40 -050066 .name = "pci_link",
Len Brown4be44fc2005-08-05 00:44:28 -040067 .class = ACPI_PCI_LINK_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +020068 .ids = link_device_ids,
Len Brown4be44fc2005-08-05 00:44:28 -040069 .ops = {
70 .add = acpi_pci_link_add,
71 .remove = acpi_pci_link_remove,
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070072 },
Linus Torvalds1da177e2005-04-16 15:20:36 -070073};
74
David Shaohua Li87bec662005-07-27 23:02:00 -040075/*
76 * If a link is initialized, we never change its active and initialized
77 * later even the link is disable. Instead, we just repick the active irq
78 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079struct acpi_pci_link_irq {
Len Brown4be44fc2005-08-05 00:44:28 -040080 u8 active; /* Current IRQ */
Bob Moore50eca3e2005-09-30 19:03:00 -040081 u8 triggering; /* All IRQs */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070082 u8 polarity; /* All IRQs */
Len Brown4be44fc2005-08-05 00:44:28 -040083 u8 resource_type;
84 u8 possible_count;
85 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
86 u8 initialized:1;
87 u8 reserved:7;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088};
89
90struct acpi_pci_link {
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070091 struct list_head list;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -070092 struct acpi_device *device;
93 struct acpi_pci_link_irq irq;
94 int refcnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095};
96
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -070097static LIST_HEAD(acpi_link_list);
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 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700107static acpi_status acpi_pci_link_check_possible(struct acpi_resource *resource,
108 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109{
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200110 struct acpi_pci_link *link = context;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700111 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
Len Browneca008c2005-09-22 00:25:18 -0400113 switch (resource->type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400114 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600115 case ACPI_RESOURCE_TYPE_END_TAG:
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) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600121 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
122 "Blank _PRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400123 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 }
Len Brown4be44fc2005-08-05 00:44:28 -0400125 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400126 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400127 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
128 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600129 printk(KERN_WARNING PREFIX
130 "Invalid _PRS IRQ %d\n",
131 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400132 continue;
133 }
134 link->irq.possible[i] = p->interrupts[i];
135 link->irq.possible_count++;
136 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400137 link->irq.triggering = p->triggering;
138 link->irq.polarity = p->polarity;
139 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400140 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400142 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400143 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400144 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400145 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400146 if (!p || !p->interrupt_count) {
Len Browncece9292006-06-26 23:04:31 -0400147 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600148 "Blank _PRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400149 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 }
Len Brown4be44fc2005-08-05 00:44:28 -0400151 for (i = 0;
Bob Moore50eca3e2005-09-30 19:03:00 -0400152 (i < p->interrupt_count
Len Brown4be44fc2005-08-05 00:44:28 -0400153 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
154 if (!p->interrupts[i]) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600155 printk(KERN_WARNING PREFIX
156 "Invalid _PRS IRQ %d\n",
157 p->interrupts[i]);
Len Brown4be44fc2005-08-05 00:44:28 -0400158 continue;
159 }
160 link->irq.possible[i] = p->interrupts[i];
161 link->irq.possible_count++;
162 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400163 link->irq.triggering = p->triggering;
164 link->irq.polarity = p->polarity;
165 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Len Brown4be44fc2005-08-05 00:44:28 -0400166 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600169 printk(KERN_ERR PREFIX "_PRS resource type 0x%x isn't an IRQ\n",
170 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400171 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 }
173
Patrick Mocheld550d982006-06-27 00:41:40 -0400174 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175}
176
Len Brown4be44fc2005-08-05 00:44:28 -0400177static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
Len Brown4be44fc2005-08-05 00:44:28 -0400179 acpi_status status;
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
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700195static acpi_status acpi_pci_link_check_current(struct acpi_resource *resource,
196 void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700198 int *irq = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199
Len Browneca008c2005-09-22 00:25:18 -0400200 switch (resource->type) {
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600201 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
202 case ACPI_RESOURCE_TYPE_END_TAG:
203 return AE_OK;
Bob Moore50eca3e2005-09-30 19:03:00 -0400204 case ACPI_RESOURCE_TYPE_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400205 {
206 struct acpi_resource_irq *p = &resource->data.irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400207 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400208 /*
209 * IRQ descriptors may have no IRQ# bits set,
210 * particularly those those w/ _STA disabled
211 */
212 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600213 "Blank _CRS IRQ resource\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400214 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400215 }
216 *irq = p->interrupts[0];
217 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400219 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
Len Brown4be44fc2005-08-05 00:44:28 -0400220 {
Bob Moore50eca3e2005-09-30 19:03:00 -0400221 struct acpi_resource_extended_irq *p =
Len Brown4be44fc2005-08-05 00:44:28 -0400222 &resource->data.extended_irq;
Bob Moore50eca3e2005-09-30 19:03:00 -0400223 if (!p || !p->interrupt_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400224 /*
225 * extended IRQ descriptors must
226 * return at least 1 IRQ
227 */
Len Browncece9292006-06-26 23:04:31 -0400228 printk(KERN_WARNING PREFIX
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600229 "Blank _CRS EXT IRQ resource\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400230 return AE_OK;
Len Brown4be44fc2005-08-05 00:44:28 -0400231 }
232 *irq = p->interrupts[0];
233 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 }
Len Brownd4ec6c72006-01-26 17:23:38 -0500235 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 default:
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600237 printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
238 resource->type);
Patrick Mocheld550d982006-06-27 00:41:40 -0400239 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
Bjorn Helgaas4a5e3632008-07-15 09:42:57 -0600241
Patrick Mocheld550d982006-06-27 00:41:40 -0400242 return AE_CTRL_TERMINATE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243}
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;
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700255 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400256 int irq = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 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{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700302 int result;
303 acpi_status status;
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
Bjorn Helgaas6eca4b42009-02-17 14:00:50 -0700310 if (!irq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400311 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Burman Yan36bcbec2006-12-19 12:56:11 -0800313 resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
Len Brown4be44fc2005-08-05 00:44:28 -0400314 if (!resource)
Patrick Mocheld550d982006-06-27 00:41:40 -0400315 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Len Brown4be44fc2005-08-05 00:44:28 -0400317 buffer.length = sizeof(*resource) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 buffer.pointer = resource;
319
Len Brown4be44fc2005-08-05 00:44:28 -0400320 switch (link->irq.resource_type) {
Bob Moore50eca3e2005-09-30 19:03:00 -0400321 case ACPI_RESOURCE_TYPE_IRQ:
322 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 resource->res.length = sizeof(struct acpi_resource);
Bob Moore50eca3e2005-09-30 19:03:00 -0400324 resource->res.data.irq.triggering = link->irq.triggering;
325 resource->res.data.irq.polarity =
326 link->irq.polarity;
327 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
328 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400329 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400331 resource->res.data.irq.sharable = ACPI_SHARED;
332 resource->res.data.irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 resource->res.data.irq.interrupts[0] = irq;
334 break;
Len Brown4be44fc2005-08-05 00:44:28 -0400335
Bob Moore50eca3e2005-09-30 19:03:00 -0400336 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
337 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 resource->res.length = sizeof(struct acpi_resource);
Len Brown4be44fc2005-08-05 00:44:28 -0400339 resource->res.data.extended_irq.producer_consumer =
340 ACPI_CONSUMER;
Bob Moore50eca3e2005-09-30 19:03:00 -0400341 resource->res.data.extended_irq.triggering =
342 link->irq.triggering;
343 resource->res.data.extended_irq.polarity =
344 link->irq.polarity;
345 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
346 resource->res.data.irq.sharable =
Len Brown4be44fc2005-08-05 00:44:28 -0400347 ACPI_EXCLUSIVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 else
Bob Moore50eca3e2005-09-30 19:03:00 -0400349 resource->res.data.irq.sharable = ACPI_SHARED;
350 resource->res.data.extended_irq.interrupt_count = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 resource->res.data.extended_irq.interrupts[0] = irq;
352 /* ignore resource_source, it's optional */
353 break;
354 default:
Len Brown64684632006-06-26 23:41:38 -0400355 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 result = -EINVAL;
357 goto end;
358
359 }
Bob Moore50eca3e2005-09-30 19:03:00 -0400360 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362 /* Attempt to set the resource */
Patrick Mochel67a71362006-05-19 16:54:42 -0400363 status = acpi_set_current_resources(link->device->handle, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
365 /* check for total failure */
366 if (ACPI_FAILURE(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -0400367 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 result = -ENODEV;
369 goto end;
370 }
371
372 /* Query _STA, set device->status */
373 result = acpi_bus_get_status(link->device);
374 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400375 printk(KERN_ERR PREFIX "Unable to read status\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 goto end;
377 }
378 if (!link->device->status.enabled) {
Len Browncece9292006-06-26 23:04:31 -0400379 printk(KERN_WARNING PREFIX
380 "%s [%s] disabled and referenced, BIOS bug\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400381 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400382 acpi_device_bid(link->device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384
385 /* Query _CRS, set link->irq.active */
386 result = acpi_pci_link_get_current(link);
387 if (result) {
388 goto end;
389 }
390
391 /*
392 * Is current setting not what we set?
393 * set link->irq.active
394 */
395 if (link->irq.active != irq) {
396 /*
397 * policy: when _CRS doesn't return what we just _SRS
398 * assume _SRS worked and override _CRS value.
399 */
Len Browncece9292006-06-26 23:04:31 -0400400 printk(KERN_WARNING PREFIX
401 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400402 acpi_device_name(link->device),
Len Browncece9292006-06-26 23:04:31 -0400403 acpi_device_bid(link->device), link->irq.active, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 link->irq.active = irq;
405 }
406
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
Len Brown4be44fc2005-08-05 00:44:28 -0400408
409 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 kfree(resource);
Patrick Mocheld550d982006-06-27 00:41:40 -0400411 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414/* --------------------------------------------------------------------------
415 PCI Link IRQ Management
416 -------------------------------------------------------------------------- */
417
418/*
419 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
420 * Link Devices to move the PIRQs around to minimize sharing.
421 *
422 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
423 * that the BIOS has already set to active. This is necessary because
424 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
425 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
426 * even if acpi_irq_nobalance is set.
427 *
428 * A tables of penalties avoids directing PCI interrupts to well known
429 * ISA IRQs. Boot params are available to over-ride the default table:
430 *
431 * List interrupts that are free for PCI use.
432 * acpi_irq_pci=n[,m]
433 *
434 * List interrupts that should not be used for PCI:
435 * acpi_irq_isa=n[,m]
436 *
437 * Note that PCI IRQ routers have a list of possible IRQs,
438 * which may not include the IRQs this table says are available.
439 *
440 * Since this heuristic can't tell the difference between a link
441 * that no device will attach to, vs. a link which may be shared
442 * by multiple active devices -- it is not optimal.
443 *
444 * If interrupt performance is that important, get an IO-APIC system
445 * with a pin dedicated to each device. Or for that matter, an MSI
446 * enabled system.
447 */
448
449#define ACPI_MAX_IRQS 256
450#define ACPI_MAX_ISA_IRQ 16
451
452#define PIRQ_PENALTY_PCI_AVAILABLE (0)
453#define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
454#define PIRQ_PENALTY_PCI_USING (16*16*16)
455#define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
456#define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
457#define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
458
459static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
460 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */
461 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */
462 PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */
Len Brown4be44fc2005-08-05 00:44:28 -0400463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */
466 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */
467 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */
468 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */
469 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */
470 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */
471 PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700472 PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */
473 PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */
474 PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */
475 PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */
Len Brown4be44fc2005-08-05 00:44:28 -0400476 /* >IRQ15 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477};
478
Len Brown4be44fc2005-08-05 00:44:28 -0400479int __init acpi_irq_penalty_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700481 struct acpi_pci_link *link;
482 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 /*
485 * Update penalties to facilitate IRQ balancing.
486 */
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700487 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 /*
490 * reflect the possible and active irqs in the penalty table --
491 * useful for breaking ties.
492 */
493 if (link->irq.possible_count) {
Len Brown4be44fc2005-08-05 00:44:28 -0400494 int penalty =
495 PIRQ_PENALTY_PCI_POSSIBLE /
496 link->irq.possible_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
498 for (i = 0; i < link->irq.possible_count; i++) {
499 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
Len Brown4be44fc2005-08-05 00:44:28 -0400500 acpi_irq_penalty[link->irq.
501 possible[i]] +=
502 penalty;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 }
504
505 } else if (link->irq.active) {
Len Brown4be44fc2005-08-05 00:44:28 -0400506 acpi_irq_penalty[link->irq.active] +=
507 PIRQ_PENALTY_PCI_POSSIBLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 }
509 }
510 /* Add a penalty for the SCI */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +0300511 acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;
Patrick Mocheld550d982006-06-27 00:41:40 -0400512 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513}
514
Bjorn Helgaas32836252008-11-05 16:17:52 -0700515static int acpi_irq_balance = -1; /* 0: static, 1: balance */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
Len Brown4be44fc2005-08-05 00:44:28 -0400517static int acpi_pci_link_allocate(struct acpi_pci_link *link)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
Len Brown4be44fc2005-08-05 00:44:28 -0400519 int irq;
520 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521
David Shaohua Li87bec662005-07-27 23:02:00 -0400522 if (link->irq.initialized) {
523 if (link->refcnt == 0)
524 /* This means the link is disabled but initialized */
525 acpi_pci_link_set(link, link->irq.active);
Patrick Mocheld550d982006-06-27 00:41:40 -0400526 return 0;
David Shaohua Li87bec662005-07-27 23:02:00 -0400527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 /*
530 * search for active IRQ in list of possible IRQs.
531 */
532 for (i = 0; i < link->irq.possible_count; ++i) {
533 if (link->irq.active == link->irq.possible[i])
534 break;
535 }
536 /*
537 * forget active IRQ that is not in possible list
538 */
539 if (i == link->irq.possible_count) {
540 if (acpi_strict)
Len Browncece9292006-06-26 23:04:31 -0400541 printk(KERN_WARNING PREFIX "_CRS %d not found"
542 " in _PRS\n", link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 link->irq.active = 0;
544 }
545
546 /*
547 * if active found, use it; else pick entry from end of possible list.
548 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700549 if (link->irq.active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 irq = link->irq.active;
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700551 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 irq = link->irq.possible[link->irq.possible_count - 1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 if (acpi_irq_balance || !link->irq.active) {
555 /*
556 * Select the best IRQ. This is done in reverse to promote
557 * the use of IRQs 9, 10, 11, and >15.
558 */
559 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
Len Brown4be44fc2005-08-05 00:44:28 -0400560 if (acpi_irq_penalty[irq] >
561 acpi_irq_penalty[link->irq.possible[i]])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 irq = link->irq.possible[i];
563 }
564 }
565
566 /* Attempt to enable the link device at this IRQ. */
567 if (acpi_pci_link_set(link, irq)) {
Len Brown64684632006-06-26 23:41:38 -0400568 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
569 "Try pci=noacpi or acpi=off\n",
Thomas Renningera6fc6722006-06-26 23:58:43 -0400570 acpi_device_name(link->device),
Len Brown64684632006-06-26 23:41:38 -0400571 acpi_device_bid(link->device));
Patrick Mocheld550d982006-06-27 00:41:40 -0400572 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 } else {
574 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
Frank Seidel4d939152009-02-04 17:03:07 +0100575 printk(KERN_WARNING PREFIX "%s [%s] enabled at IRQ %d\n",
Len Brown4be44fc2005-08-05 00:44:28 -0400576 acpi_device_name(link->device),
577 acpi_device_bid(link->device), link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 }
579
580 link->irq.initialized = 1;
Patrick Mocheld550d982006-06-27 00:41:40 -0400581 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
584/*
David Shaohua Li87bec662005-07-27 23:02:00 -0400585 * acpi_pci_link_allocate_irq
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 * success: return IRQ >= 0
587 * failure: return -1
588 */
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700589int acpi_pci_link_allocate_irq(acpi_handle handle, int index, int *triggering,
590 int *polarity, char **name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700592 int result;
593 struct acpi_device *device;
594 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 result = acpi_bus_get_device(handle, &device);
597 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400598 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400599 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 }
601
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200602 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400604 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400605 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 }
607
608 /* TBD: Support multiple index (IRQ) entries per Link Device */
609 if (index) {
Len Brown64684632006-06-26 23:41:38 -0400610 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
Patrick Mocheld550d982006-06-27 00:41:40 -0400611 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 }
613
Ingo Molnar36e43092006-04-27 05:25:00 -0400614 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400615 if (acpi_pci_link_allocate(link)) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400616 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400617 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400618 }
Len Brown4be44fc2005-08-05 00:44:28 -0400619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 if (!link->irq.active) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400621 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400622 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400623 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 }
Len Brown4be44fc2005-08-05 00:44:28 -0400625 link->refcnt++;
Ingo Molnar36e43092006-04-27 05:25:00 -0400626 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Bob Moore50eca3e2005-09-30 19:03:00 -0400628 if (triggering)
629 *triggering = link->irq.triggering;
630 if (polarity)
631 *polarity = link->irq.polarity;
Len Brown4be44fc2005-08-05 00:44:28 -0400632 if (name)
633 *name = acpi_device_bid(link->device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400634 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400635 "Link %s is referenced\n",
636 acpi_device_bid(link->device)));
Patrick Mocheld550d982006-06-27 00:41:40 -0400637 return (link->irq.active);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638}
639
David Shaohua Li87bec662005-07-27 23:02:00 -0400640/*
641 * We don't change link's irq information here. After it is reenabled, we
642 * continue use the info
643 */
Len Brown4be44fc2005-08-05 00:44:28 -0400644int acpi_pci_link_free_irq(acpi_handle handle)
David Shaohua Li87bec662005-07-27 23:02:00 -0400645{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700646 struct acpi_device *device;
647 struct acpi_pci_link *link;
Len Brown4be44fc2005-08-05 00:44:28 -0400648 acpi_status result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
David Shaohua Li87bec662005-07-27 23:02:00 -0400650 result = acpi_bus_get_device(handle, &device);
651 if (result) {
Len Brown64684632006-06-26 23:41:38 -0400652 printk(KERN_ERR PREFIX "Invalid link device\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400653 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400654 }
655
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200656 link = acpi_driver_data(device);
David Shaohua Li87bec662005-07-27 23:02:00 -0400657 if (!link) {
Len Brown64684632006-06-26 23:41:38 -0400658 printk(KERN_ERR PREFIX "Invalid link context\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400659 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400660 }
661
Ingo Molnar36e43092006-04-27 05:25:00 -0400662 mutex_lock(&acpi_link_lock);
David Shaohua Li87bec662005-07-27 23:02:00 -0400663 if (!link->irq.initialized) {
Ingo Molnar36e43092006-04-27 05:25:00 -0400664 mutex_unlock(&acpi_link_lock);
Len Brown64684632006-06-26 23:41:38 -0400665 printk(KERN_ERR PREFIX "Link isn't initialized\n");
Patrick Mocheld550d982006-06-27 00:41:40 -0400666 return -1;
David Shaohua Li87bec662005-07-27 23:02:00 -0400667 }
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400668#ifdef FUTURE_USE
669 /*
670 * The Link reference count allows us to _DISable an unused link
671 * and suspend time, and set it again on resume.
672 * However, 2.6.12 still has irq_router.resume
673 * which blindly restores the link state.
674 * So we disable the reference count method
675 * to prevent duplicate acpi_pci_link_set()
676 * which would harm some systems
677 */
Len Brown4be44fc2005-08-05 00:44:28 -0400678 link->refcnt--;
David Shaohua Liecc21eb2005-08-03 11:00:11 -0400679#endif
David Shaohua Li87bec662005-07-27 23:02:00 -0400680 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -0400681 "Link %s is dereferenced\n",
682 acpi_device_bid(link->device)));
David Shaohua Li87bec662005-07-27 23:02:00 -0400683
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700684 if (link->refcnt == 0)
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700685 acpi_evaluate_object(link->device->handle, "_DIS", NULL, NULL);
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700686
Ingo Molnar36e43092006-04-27 05:25:00 -0400687 mutex_unlock(&acpi_link_lock);
Patrick Mocheld550d982006-06-27 00:41:40 -0400688 return (link->irq.active);
David Shaohua Li87bec662005-07-27 23:02:00 -0400689}
Len Brown4be44fc2005-08-05 00:44:28 -0400690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691/* --------------------------------------------------------------------------
692 Driver Interface
693 -------------------------------------------------------------------------- */
694
Len Brown4be44fc2005-08-05 00:44:28 -0400695static int acpi_pci_link_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700697 int result;
698 struct acpi_pci_link *link;
699 int i;
Len Brown4be44fc2005-08-05 00:44:28 -0400700 int found = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Burman Yan36bcbec2006-12-19 12:56:11 -0800702 link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 if (!link)
Patrick Mocheld550d982006-06-27 00:41:40 -0400704 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
706 link->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
708 strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700709 device->driver_data = link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710
Ingo Molnar36e43092006-04-27 05:25:00 -0400711 mutex_lock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 result = acpi_pci_link_get_possible(link);
713 if (result)
714 goto end;
715
716 /* query and set link->irq.active */
717 acpi_pci_link_get_current(link);
718
Dan Aloni0dc070b2007-07-09 11:33:18 -0700719 printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
Len Brown4be44fc2005-08-05 00:44:28 -0400720 acpi_device_bid(device));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 for (i = 0; i < link->irq.possible_count; i++) {
722 if (link->irq.active == link->irq.possible[i]) {
723 printk(" *%d", link->irq.possible[i]);
724 found = 1;
Len Brown4be44fc2005-08-05 00:44:28 -0400725 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 printk(" %d", link->irq.possible[i]);
727 }
728
729 printk(")");
730
731 if (!found)
732 printk(" *%d", link->irq.active);
733
Len Brown4be44fc2005-08-05 00:44:28 -0400734 if (!link->device->status.enabled)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 printk(", disabled.");
736
737 printk("\n");
738
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700739 list_add_tail(&link->list, &acpi_link_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Len Brown4be44fc2005-08-05 00:44:28 -0400741 end:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 /* disable all links -- to be activated on use */
donald.d.dugger@intel.com383d7a12008-10-17 07:49:50 -0700743 acpi_evaluate_object(device->handle, "_DIS", NULL, NULL);
Ingo Molnar36e43092006-04-27 05:25:00 -0400744 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
746 if (result)
747 kfree(link);
748
Patrick Mocheld550d982006-06-27 00:41:40 -0400749 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750}
751
Len Brown4be44fc2005-08-05 00:44:28 -0400752static int acpi_pci_link_resume(struct acpi_pci_link *link)
Linus Torvalds697a2d62005-08-01 12:37:54 -0700753{
Linus Torvalds697a2d62005-08-01 12:37:54 -0700754 if (link->refcnt && link->irq.active && link->irq.initialized)
Patrick Mocheld550d982006-06-27 00:41:40 -0400755 return (acpi_pci_link_set(link, link->irq.active));
Bjorn Helgaas1c9ca3a2009-02-17 14:00:40 -0700756
757 return 0;
Linus Torvalds697a2d62005-08-01 12:37:54 -0700758}
759
Len Brown4be44fc2005-08-05 00:44:28 -0400760static int irqrouter_resume(struct sys_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700762 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700764 list_for_each_entry(link, &acpi_link_list, list) {
Linus Torvalds697a2d62005-08-01 12:37:54 -0700765 acpi_pci_link_resume(link);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
Patrick Mocheld550d982006-06-27 00:41:40 -0400767 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
Len Brown4be44fc2005-08-05 00:44:28 -0400770static int acpi_pci_link_remove(struct acpi_device *device, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771{
Bjorn Helgaasc9d62442009-02-17 14:00:45 -0700772 struct acpi_pci_link *link;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200774 link = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Ingo Molnar36e43092006-04-27 05:25:00 -0400776 mutex_lock(&acpi_link_lock);
Bjorn Helgaas5f0dcca2009-02-17 14:00:55 -0700777 list_del(&link->list);
Ingo Molnar36e43092006-04-27 05:25:00 -0400778 mutex_unlock(&acpi_link_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
780 kfree(link);
Patrick Mocheld550d982006-06-27 00:41:40 -0400781 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782}
783
784/*
785 * modify acpi_irq_penalty[] from cmdline
786 */
787static int __init acpi_irq_penalty_update(char *str, int used)
788{
789 int i;
790
791 for (i = 0; i < 16; i++) {
792 int retval;
793 int irq;
794
Len Brown4be44fc2005-08-05 00:44:28 -0400795 retval = get_option(&str, &irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796
797 if (!retval)
798 break; /* no number found */
799
800 if (irq < 0)
801 continue;
Len Brown4be44fc2005-08-05 00:44:28 -0400802
Bjorn Helgaasfa46d352008-08-01 15:58:17 -0600803 if (irq >= ARRAY_SIZE(acpi_irq_penalty))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 continue;
805
806 if (used)
807 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
808 else
809 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
810
811 if (retval != 2) /* no next number */
812 break;
813 }
814 return 1;
815}
816
817/*
818 * We'd like PNP to call this routine for the
819 * single ISA_USED value for each legacy device.
820 * But instead it calls us with each POSSIBLE setting.
821 * There is no ISA_POSSIBLE weight, so we simply use
822 * the (small) PCI_USING penalty.
823 */
David Shaohua Lic9c3e452005-04-01 00:07:31 -0500824void acpi_penalize_isa_irq(int irq, int active)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825{
Bjorn Helgaasfa46d352008-08-01 15:58:17 -0600826 if (irq >= 0 && irq < ARRAY_SIZE(acpi_irq_penalty)) {
827 if (active)
828 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
829 else
830 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
831 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832}
833
834/*
835 * Over-ride default table to reserve additional IRQs for use by ISA
836 * e.g. acpi_irq_isa=5
837 * Useful for telling ACPI how not to interfere with your ISA sound card.
838 */
839static int __init acpi_irq_isa(char *str)
840{
841 return acpi_irq_penalty_update(str, 1);
842}
Len Brown4be44fc2005-08-05 00:44:28 -0400843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844__setup("acpi_irq_isa=", acpi_irq_isa);
845
846/*
847 * Over-ride default table to free additional IRQs for use by PCI
848 * e.g. acpi_irq_pci=7,15
849 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
850 */
851static int __init acpi_irq_pci(char *str)
852{
853 return acpi_irq_penalty_update(str, 0);
854}
Len Brown4be44fc2005-08-05 00:44:28 -0400855
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856__setup("acpi_irq_pci=", acpi_irq_pci);
857
858static int __init acpi_irq_nobalance_set(char *str)
859{
860 acpi_irq_balance = 0;
861 return 1;
862}
Len Brown4be44fc2005-08-05 00:44:28 -0400863
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
865
Roel Kluin8a383ef2008-12-09 20:45:30 +0100866static int __init acpi_irq_balance_set(char *str)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867{
868 acpi_irq_balance = 1;
869 return 1;
870}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Len Brown4be44fc2005-08-05 00:44:28 -0400872__setup("acpi_irq_balance", acpi_irq_balance_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
David Shaohua Li87bec662005-07-27 23:02:00 -0400874/* FIXME: we will remove this interface after all drivers call pci_disable_device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875static struct sysdev_class irqrouter_sysdev_class = {
Kay Sieversaf5ca3f2007-12-20 02:09:39 +0100876 .name = "irqrouter",
Len Brown4be44fc2005-08-05 00:44:28 -0400877 .resume = irqrouter_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878};
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880static struct sys_device device_irqrouter = {
Len Brown4be44fc2005-08-05 00:44:28 -0400881 .id = 0,
882 .cls = &irqrouter_sysdev_class,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883};
884
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885static int __init irqrouter_init_sysfs(void)
886{
887 int error;
888
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 if (acpi_disabled || acpi_noirq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400890 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891
892 error = sysdev_class_register(&irqrouter_sysdev_class);
893 if (!error)
894 error = sysdev_register(&device_irqrouter);
895
Patrick Mocheld550d982006-06-27 00:41:40 -0400896 return error;
Len Brown4be44fc2005-08-05 00:44:28 -0400897}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899device_initcall(irqrouter_init_sysfs);
900
Len Brown4be44fc2005-08-05 00:44:28 -0400901static int __init acpi_pci_link_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 if (acpi_noirq)
Patrick Mocheld550d982006-06-27 00:41:40 -0400904 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905
Bjorn Helgaas32836252008-11-05 16:17:52 -0700906 if (acpi_irq_balance == -1) {
907 /* no command line switch: enable balancing in IOAPIC mode */
908 if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
909 acpi_irq_balance = 1;
910 else
911 acpi_irq_balance = 0;
912 }
913
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -0400915 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916
Patrick Mocheld550d982006-06-27 00:41:40 -0400917 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918}
919
920subsys_initcall(acpi_pci_link_init);