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1da177e4 LT |
1 | /* |
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> | |
36e43095 | 41 | #include <linux/mutex.h> |
1da177e4 LT |
42 | |
43 | #include <acpi/acpi_bus.h> | |
44 | #include <acpi/acpi_drivers.h> | |
45 | ||
1da177e4 | 46 | #define _COMPONENT ACPI_PCI_COMPONENT |
f52fd66d | 47 | ACPI_MODULE_NAME("pci_link"); |
1da177e4 | 48 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
1da177e4 LT |
49 | #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" | |
1da177e4 | 52 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
4be44fcd LB |
53 | static int acpi_pci_link_add(struct acpi_device *device); |
54 | static int acpi_pci_link_remove(struct acpi_device *device, int type); | |
1da177e4 | 55 | |
1ba90e3a TR |
56 | static struct acpi_device_id link_device_ids[] = { |
57 | {"PNP0C0F", 0}, | |
58 | {"", 0}, | |
59 | }; | |
60 | MODULE_DEVICE_TABLE(acpi, link_device_ids); | |
61 | ||
1da177e4 | 62 | static struct acpi_driver acpi_pci_link_driver = { |
c2b6705b | 63 | .name = "pci_link", |
4be44fcd | 64 | .class = ACPI_PCI_LINK_CLASS, |
1ba90e3a | 65 | .ids = link_device_ids, |
4be44fcd LB |
66 | .ops = { |
67 | .add = acpi_pci_link_add, | |
68 | .remove = acpi_pci_link_remove, | |
69 | }, | |
1da177e4 LT |
70 | }; |
71 | ||
87bec66b DSL |
72 | /* |
73 | * If a link is initialized, we never change its active and initialized | |
74 | * later even the link is disable. Instead, we just repick the active irq | |
75 | */ | |
1da177e4 | 76 | struct acpi_pci_link_irq { |
4be44fcd | 77 | u8 active; /* Current IRQ */ |
50eca3eb BM |
78 | u8 triggering; /* All IRQs */ |
79 | u8 polarity; /* All IRQs */ | |
4be44fcd LB |
80 | u8 resource_type; |
81 | u8 possible_count; | |
82 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
83 | u8 initialized:1; | |
84 | u8 reserved:7; | |
1da177e4 LT |
85 | }; |
86 | ||
87 | struct acpi_pci_link { | |
4be44fcd LB |
88 | struct list_head node; |
89 | struct acpi_device *device; | |
1da177e4 | 90 | struct acpi_pci_link_irq irq; |
4be44fcd | 91 | int refcnt; |
1da177e4 LT |
92 | }; |
93 | ||
94 | static struct { | |
4be44fcd LB |
95 | int count; |
96 | struct list_head entries; | |
97 | } acpi_link; | |
36e43095 | 98 | DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 99 | |
1da177e4 LT |
100 | /* -------------------------------------------------------------------------- |
101 | PCI Link Device Management | |
102 | -------------------------------------------------------------------------- */ | |
103 | ||
104 | /* | |
105 | * set context (link) possible list from resource list | |
106 | */ | |
107 | static acpi_status | |
4be44fcd | 108 | acpi_pci_link_check_possible(struct acpi_resource *resource, void *context) |
1da177e4 | 109 | { |
50dd0969 | 110 | struct acpi_pci_link *link = context; |
4be44fcd | 111 | u32 i = 0; |
1da177e4 | 112 | |
1da177e4 | 113 | |
eca008c8 | 114 | switch (resource->type) { |
50eca3eb | 115 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
d550d98d | 116 | return AE_OK; |
50eca3eb | 117 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
118 | { |
119 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 120 | if (!p || !p->interrupt_count) { |
cece9296 | 121 | printk(KERN_WARNING PREFIX "Blank IRQ resource\n"); |
d550d98d | 122 | return AE_OK; |
1da177e4 | 123 | } |
4be44fcd | 124 | for (i = 0; |
50eca3eb | 125 | (i < p->interrupt_count |
4be44fcd LB |
126 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
127 | if (!p->interrupts[i]) { | |
cece9296 LB |
128 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
129 | p->interrupts[i]); | |
4be44fcd LB |
130 | continue; |
131 | } | |
132 | link->irq.possible[i] = p->interrupts[i]; | |
133 | link->irq.possible_count++; | |
134 | } | |
50eca3eb BM |
135 | link->irq.triggering = p->triggering; |
136 | link->irq.polarity = p->polarity; | |
137 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 138 | break; |
1da177e4 | 139 | } |
50eca3eb | 140 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 141 | { |
50eca3eb | 142 | struct acpi_resource_extended_irq *p = |
4be44fcd | 143 | &resource->data.extended_irq; |
50eca3eb | 144 | if (!p || !p->interrupt_count) { |
cece9296 LB |
145 | printk(KERN_WARNING PREFIX |
146 | "Blank EXT IRQ resource\n"); | |
d550d98d | 147 | return AE_OK; |
4be44fcd LB |
148 | } |
149 | for (i = 0; | |
50eca3eb | 150 | (i < p->interrupt_count |
4be44fcd LB |
151 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
152 | if (!p->interrupts[i]) { | |
cece9296 LB |
153 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
154 | p->interrupts[i]); | |
4be44fcd LB |
155 | continue; |
156 | } | |
157 | link->irq.possible[i] = p->interrupts[i]; | |
158 | link->irq.possible_count++; | |
1da177e4 | 159 | } |
50eca3eb BM |
160 | link->irq.triggering = p->triggering; |
161 | link->irq.polarity = p->polarity; | |
162 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 163 | break; |
1da177e4 | 164 | } |
1da177e4 | 165 | default: |
6468463a | 166 | printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n"); |
d550d98d | 167 | return AE_OK; |
1da177e4 LT |
168 | } |
169 | ||
d550d98d | 170 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
171 | } |
172 | ||
4be44fcd | 173 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 174 | { |
4be44fcd | 175 | acpi_status status; |
1da177e4 | 176 | |
1da177e4 LT |
177 | |
178 | if (!link) | |
d550d98d | 179 | return -EINVAL; |
1da177e4 | 180 | |
67a71365 | 181 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 182 | acpi_pci_link_check_possible, link); |
1da177e4 | 183 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 184 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 185 | return -ENODEV; |
1da177e4 LT |
186 | } |
187 | ||
4be44fcd LB |
188 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
189 | "Found %d possible IRQs\n", | |
190 | link->irq.possible_count)); | |
1da177e4 | 191 | |
d550d98d | 192 | return 0; |
1da177e4 LT |
193 | } |
194 | ||
1da177e4 | 195 | static acpi_status |
4be44fcd | 196 | acpi_pci_link_check_current(struct acpi_resource *resource, void *context) |
1da177e4 | 197 | { |
4be44fcd | 198 | int *irq = (int *)context; |
1da177e4 | 199 | |
1da177e4 | 200 | |
eca008c8 | 201 | switch (resource->type) { |
50eca3eb | 202 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
203 | { |
204 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 205 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
206 | /* |
207 | * IRQ descriptors may have no IRQ# bits set, | |
208 | * particularly those those w/ _STA disabled | |
209 | */ | |
210 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
211 | "Blank IRQ resource\n")); | |
d550d98d | 212 | return AE_OK; |
4be44fcd LB |
213 | } |
214 | *irq = p->interrupts[0]; | |
215 | break; | |
1da177e4 | 216 | } |
50eca3eb | 217 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 218 | { |
50eca3eb | 219 | struct acpi_resource_extended_irq *p = |
4be44fcd | 220 | &resource->data.extended_irq; |
50eca3eb | 221 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
222 | /* |
223 | * extended IRQ descriptors must | |
224 | * return at least 1 IRQ | |
225 | */ | |
cece9296 LB |
226 | printk(KERN_WARNING PREFIX |
227 | "Blank EXT IRQ resource\n"); | |
d550d98d | 228 | return AE_OK; |
4be44fcd LB |
229 | } |
230 | *irq = p->interrupts[0]; | |
231 | break; | |
1da177e4 | 232 | } |
d4ec6c7c | 233 | break; |
1da177e4 | 234 | default: |
6468463a | 235 | printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type); |
d4ec6c7c | 236 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 237 | return AE_OK; |
1da177e4 | 238 | } |
d550d98d | 239 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
240 | } |
241 | ||
242 | /* | |
243 | * Run _CRS and set link->irq.active | |
244 | * | |
245 | * return value: | |
246 | * 0 - success | |
247 | * !0 - failure | |
248 | */ | |
4be44fcd | 249 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 250 | { |
4be44fcd LB |
251 | int result = 0; |
252 | acpi_status status = AE_OK; | |
253 | int irq = 0; | |
1da177e4 | 254 | |
e0e4e117 | 255 | if (!link) |
d550d98d | 256 | return -EINVAL; |
1da177e4 LT |
257 | |
258 | link->irq.active = 0; | |
259 | ||
260 | /* in practice, status disabled is meaningless, ignore it */ | |
261 | if (acpi_strict) { | |
262 | /* Query _STA, set link->device->status */ | |
263 | result = acpi_bus_get_status(link->device); | |
264 | if (result) { | |
6468463a | 265 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
266 | goto end; |
267 | } | |
268 | ||
269 | if (!link->device->status.enabled) { | |
270 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 271 | return 0; |
1da177e4 LT |
272 | } |
273 | } | |
274 | ||
275 | /* | |
276 | * Query and parse _CRS to get the current IRQ assignment. | |
277 | */ | |
278 | ||
67a71365 | 279 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 280 | acpi_pci_link_check_current, &irq); |
1da177e4 | 281 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 282 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
283 | result = -ENODEV; |
284 | goto end; | |
285 | } | |
286 | ||
287 | if (acpi_strict && !irq) { | |
6468463a | 288 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
289 | 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 | ||
4be44fcd | 296 | end: |
d550d98d | 297 | return result; |
1da177e4 LT |
298 | } |
299 | ||
4be44fcd | 300 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 301 | { |
4be44fcd LB |
302 | int result = 0; |
303 | acpi_status status = AE_OK; | |
1da177e4 | 304 | struct { |
4be44fcd LB |
305 | struct acpi_resource res; |
306 | struct acpi_resource end; | |
307 | } *resource; | |
308 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 309 | |
1da177e4 LT |
310 | |
311 | if (!link || !irq) | |
d550d98d | 312 | return -EINVAL; |
1da177e4 | 313 | |
36bcbec7 | 314 | resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 315 | if (!resource) |
d550d98d | 316 | return -ENOMEM; |
1da177e4 | 317 | |
4be44fcd | 318 | buffer.length = sizeof(*resource) + 1; |
1da177e4 LT |
319 | buffer.pointer = resource; |
320 | ||
4be44fcd | 321 | switch (link->irq.resource_type) { |
50eca3eb BM |
322 | case ACPI_RESOURCE_TYPE_IRQ: |
323 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 324 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
325 | resource->res.data.irq.triggering = link->irq.triggering; |
326 | resource->res.data.irq.polarity = | |
327 | link->irq.polarity; | |
328 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
329 | resource->res.data.irq.sharable = | |
4be44fcd | 330 | ACPI_EXCLUSIVE; |
1da177e4 | 331 | else |
50eca3eb BM |
332 | resource->res.data.irq.sharable = ACPI_SHARED; |
333 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
334 | resource->res.data.irq.interrupts[0] = irq; |
335 | break; | |
4be44fcd | 336 | |
50eca3eb BM |
337 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
338 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 339 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
340 | resource->res.data.extended_irq.producer_consumer = |
341 | ACPI_CONSUMER; | |
50eca3eb BM |
342 | resource->res.data.extended_irq.triggering = |
343 | link->irq.triggering; | |
344 | resource->res.data.extended_irq.polarity = | |
345 | link->irq.polarity; | |
346 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
347 | resource->res.data.irq.sharable = | |
4be44fcd | 348 | ACPI_EXCLUSIVE; |
1da177e4 | 349 | else |
50eca3eb BM |
350 | resource->res.data.irq.sharable = ACPI_SHARED; |
351 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
352 | resource->res.data.extended_irq.interrupts[0] = irq; |
353 | /* ignore resource_source, it's optional */ | |
354 | break; | |
355 | default: | |
6468463a | 356 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
357 | result = -EINVAL; |
358 | goto end; | |
359 | ||
360 | } | |
50eca3eb | 361 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
362 | |
363 | /* Attempt to set the resource */ | |
67a71365 | 364 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
365 | |
366 | /* check for total failure */ | |
367 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 368 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
369 | result = -ENODEV; |
370 | goto end; | |
371 | } | |
372 | ||
373 | /* Query _STA, set device->status */ | |
374 | result = acpi_bus_get_status(link->device); | |
375 | if (result) { | |
6468463a | 376 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
377 | goto end; |
378 | } | |
379 | if (!link->device->status.enabled) { | |
cece9296 LB |
380 | printk(KERN_WARNING PREFIX |
381 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 382 | acpi_device_name(link->device), |
cece9296 | 383 | acpi_device_bid(link->device)); |
1da177e4 LT |
384 | } |
385 | ||
386 | /* Query _CRS, set link->irq.active */ | |
387 | result = acpi_pci_link_get_current(link); | |
388 | if (result) { | |
389 | goto end; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Is current setting not what we set? | |
394 | * set link->irq.active | |
395 | */ | |
396 | if (link->irq.active != irq) { | |
397 | /* | |
398 | * policy: when _CRS doesn't return what we just _SRS | |
399 | * assume _SRS worked and override _CRS value. | |
400 | */ | |
cece9296 LB |
401 | printk(KERN_WARNING PREFIX |
402 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 403 | acpi_device_name(link->device), |
cece9296 | 404 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
405 | link->irq.active = irq; |
406 | } | |
407 | ||
408 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
409 | |
410 | end: | |
1da177e4 | 411 | kfree(resource); |
d550d98d | 412 | return result; |
1da177e4 LT |
413 | } |
414 | ||
1da177e4 LT |
415 | /* -------------------------------------------------------------------------- |
416 | PCI Link IRQ Management | |
417 | -------------------------------------------------------------------------- */ | |
418 | ||
419 | /* | |
420 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
421 | * Link Devices to move the PIRQs around to minimize sharing. | |
422 | * | |
423 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
424 | * that the BIOS has already set to active. This is necessary because | |
425 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
426 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
427 | * even if acpi_irq_nobalance is set. | |
428 | * | |
429 | * A tables of penalties avoids directing PCI interrupts to well known | |
430 | * ISA IRQs. Boot params are available to over-ride the default table: | |
431 | * | |
432 | * List interrupts that are free for PCI use. | |
433 | * acpi_irq_pci=n[,m] | |
434 | * | |
435 | * List interrupts that should not be used for PCI: | |
436 | * acpi_irq_isa=n[,m] | |
437 | * | |
438 | * Note that PCI IRQ routers have a list of possible IRQs, | |
439 | * which may not include the IRQs this table says are available. | |
440 | * | |
441 | * Since this heuristic can't tell the difference between a link | |
442 | * that no device will attach to, vs. a link which may be shared | |
443 | * by multiple active devices -- it is not optimal. | |
444 | * | |
445 | * If interrupt performance is that important, get an IO-APIC system | |
446 | * with a pin dedicated to each device. Or for that matter, an MSI | |
447 | * enabled system. | |
448 | */ | |
449 | ||
450 | #define ACPI_MAX_IRQS 256 | |
451 | #define ACPI_MAX_ISA_IRQ 16 | |
452 | ||
453 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
454 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
455 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
456 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
457 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
458 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
459 | ||
460 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
461 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
462 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
463 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
464 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
465 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
466 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
467 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
468 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
469 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
470 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
471 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
472 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
473 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ | |
474 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
475 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
476 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 477 | /* >IRQ15 */ |
1da177e4 LT |
478 | }; |
479 | ||
4be44fcd | 480 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 481 | { |
4be44fcd LB |
482 | struct list_head *node = NULL; |
483 | struct acpi_pci_link *link = NULL; | |
484 | int i = 0; | |
1da177e4 | 485 | |
1da177e4 LT |
486 | |
487 | /* | |
488 | * Update penalties to facilitate IRQ balancing. | |
489 | */ | |
490 | list_for_each(node, &acpi_link.entries) { | |
491 | ||
492 | link = list_entry(node, struct acpi_pci_link, node); | |
493 | if (!link) { | |
6468463a | 494 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
495 | continue; |
496 | } | |
497 | ||
498 | /* | |
499 | * reflect the possible and active irqs in the penalty table -- | |
500 | * useful for breaking ties. | |
501 | */ | |
502 | if (link->irq.possible_count) { | |
4be44fcd LB |
503 | int penalty = |
504 | PIRQ_PENALTY_PCI_POSSIBLE / | |
505 | link->irq.possible_count; | |
1da177e4 LT |
506 | |
507 | for (i = 0; i < link->irq.possible_count; i++) { | |
508 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
509 | acpi_irq_penalty[link->irq. |
510 | possible[i]] += | |
511 | penalty; | |
1da177e4 LT |
512 | } |
513 | ||
514 | } else if (link->irq.active) { | |
4be44fcd LB |
515 | acpi_irq_penalty[link->irq.active] += |
516 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
517 | } |
518 | } | |
519 | /* Add a penalty for the SCI */ | |
cee324b1 | 520 | acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING; |
1da177e4 | 521 | |
d550d98d | 522 | return 0; |
1da177e4 LT |
523 | } |
524 | ||
525 | static int acpi_irq_balance; /* 0: static, 1: balance */ | |
526 | ||
4be44fcd | 527 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 528 | { |
4be44fcd LB |
529 | int irq; |
530 | int i; | |
1da177e4 | 531 | |
1da177e4 | 532 | |
87bec66b DSL |
533 | if (link->irq.initialized) { |
534 | if (link->refcnt == 0) | |
535 | /* This means the link is disabled but initialized */ | |
536 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 537 | return 0; |
87bec66b | 538 | } |
1da177e4 LT |
539 | |
540 | /* | |
541 | * search for active IRQ in list of possible IRQs. | |
542 | */ | |
543 | for (i = 0; i < link->irq.possible_count; ++i) { | |
544 | if (link->irq.active == link->irq.possible[i]) | |
545 | break; | |
546 | } | |
547 | /* | |
548 | * forget active IRQ that is not in possible list | |
549 | */ | |
550 | if (i == link->irq.possible_count) { | |
551 | if (acpi_strict) | |
cece9296 LB |
552 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
553 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
554 | link->irq.active = 0; |
555 | } | |
556 | ||
557 | /* | |
558 | * if active found, use it; else pick entry from end of possible list. | |
559 | */ | |
560 | if (link->irq.active) { | |
561 | irq = link->irq.active; | |
562 | } else { | |
563 | irq = link->irq.possible[link->irq.possible_count - 1]; | |
564 | } | |
565 | ||
566 | if (acpi_irq_balance || !link->irq.active) { | |
567 | /* | |
568 | * Select the best IRQ. This is done in reverse to promote | |
569 | * the use of IRQs 9, 10, 11, and >15. | |
570 | */ | |
571 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
572 | if (acpi_irq_penalty[irq] > |
573 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
574 | irq = link->irq.possible[i]; |
575 | } | |
576 | } | |
577 | ||
578 | /* Attempt to enable the link device at this IRQ. */ | |
579 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
580 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
581 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 582 | acpi_device_name(link->device), |
6468463a | 583 | acpi_device_bid(link->device)); |
d550d98d | 584 | return -ENODEV; |
1da177e4 LT |
585 | } else { |
586 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4be44fcd LB |
587 | printk(PREFIX "%s [%s] enabled at IRQ %d\n", |
588 | acpi_device_name(link->device), | |
589 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
590 | } |
591 | ||
592 | link->irq.initialized = 1; | |
593 | ||
d550d98d | 594 | return 0; |
1da177e4 LT |
595 | } |
596 | ||
597 | /* | |
87bec66b | 598 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
599 | * success: return IRQ >= 0 |
600 | * failure: return -1 | |
601 | */ | |
602 | ||
603 | int | |
4be44fcd LB |
604 | acpi_pci_link_allocate_irq(acpi_handle handle, |
605 | int index, | |
50eca3eb | 606 | int *triggering, int *polarity, char **name) |
1da177e4 | 607 | { |
4be44fcd LB |
608 | int result = 0; |
609 | struct acpi_device *device = NULL; | |
610 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 611 | |
1da177e4 LT |
612 | |
613 | result = acpi_bus_get_device(handle, &device); | |
614 | if (result) { | |
6468463a | 615 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 616 | return -1; |
1da177e4 LT |
617 | } |
618 | ||
50dd0969 | 619 | link = acpi_driver_data(device); |
1da177e4 | 620 | if (!link) { |
6468463a | 621 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 622 | return -1; |
1da177e4 LT |
623 | } |
624 | ||
625 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
626 | if (index) { | |
6468463a | 627 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 628 | return -1; |
1da177e4 LT |
629 | } |
630 | ||
36e43095 | 631 | mutex_lock(&acpi_link_lock); |
87bec66b | 632 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 633 | mutex_unlock(&acpi_link_lock); |
d550d98d | 634 | return -1; |
87bec66b | 635 | } |
4be44fcd | 636 | |
1da177e4 | 637 | if (!link->irq.active) { |
36e43095 | 638 | mutex_unlock(&acpi_link_lock); |
6468463a | 639 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 640 | return -1; |
1da177e4 | 641 | } |
4be44fcd | 642 | link->refcnt++; |
36e43095 | 643 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 644 | |
50eca3eb BM |
645 | if (triggering) |
646 | *triggering = link->irq.triggering; | |
647 | if (polarity) | |
648 | *polarity = link->irq.polarity; | |
4be44fcd LB |
649 | if (name) |
650 | *name = acpi_device_bid(link->device); | |
87bec66b | 651 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
652 | "Link %s is referenced\n", |
653 | acpi_device_bid(link->device))); | |
d550d98d | 654 | return (link->irq.active); |
1da177e4 LT |
655 | } |
656 | ||
87bec66b DSL |
657 | /* |
658 | * We don't change link's irq information here. After it is reenabled, we | |
659 | * continue use the info | |
660 | */ | |
4be44fcd | 661 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 662 | { |
4be44fcd LB |
663 | struct acpi_device *device = NULL; |
664 | struct acpi_pci_link *link = NULL; | |
665 | acpi_status result; | |
87bec66b | 666 | |
87bec66b DSL |
667 | |
668 | result = acpi_bus_get_device(handle, &device); | |
669 | if (result) { | |
6468463a | 670 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 671 | return -1; |
87bec66b | 672 | } |
1da177e4 | 673 | |
50dd0969 | 674 | link = acpi_driver_data(device); |
87bec66b | 675 | if (!link) { |
6468463a | 676 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 677 | return -1; |
87bec66b DSL |
678 | } |
679 | ||
36e43095 | 680 | mutex_lock(&acpi_link_lock); |
87bec66b | 681 | if (!link->irq.initialized) { |
36e43095 | 682 | mutex_unlock(&acpi_link_lock); |
6468463a | 683 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 684 | return -1; |
87bec66b | 685 | } |
ecc21ebe DSL |
686 | #ifdef FUTURE_USE |
687 | /* | |
688 | * The Link reference count allows us to _DISable an unused link | |
689 | * and suspend time, and set it again on resume. | |
690 | * However, 2.6.12 still has irq_router.resume | |
691 | * which blindly restores the link state. | |
692 | * So we disable the reference count method | |
693 | * to prevent duplicate acpi_pci_link_set() | |
694 | * which would harm some systems | |
695 | */ | |
4be44fcd | 696 | link->refcnt--; |
ecc21ebe | 697 | #endif |
87bec66b | 698 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
699 | "Link %s is dereferenced\n", |
700 | acpi_device_bid(link->device))); | |
87bec66b DSL |
701 | |
702 | if (link->refcnt == 0) { | |
67a71365 | 703 | acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL); |
87bec66b | 704 | } |
36e43095 | 705 | mutex_unlock(&acpi_link_lock); |
d550d98d | 706 | return (link->irq.active); |
87bec66b | 707 | } |
4be44fcd | 708 | |
1da177e4 LT |
709 | /* -------------------------------------------------------------------------- |
710 | Driver Interface | |
711 | -------------------------------------------------------------------------- */ | |
712 | ||
4be44fcd | 713 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 714 | { |
4be44fcd LB |
715 | int result = 0; |
716 | struct acpi_pci_link *link = NULL; | |
717 | int i = 0; | |
718 | int found = 0; | |
1da177e4 | 719 | |
1da177e4 LT |
720 | |
721 | if (!device) | |
d550d98d | 722 | return -EINVAL; |
1da177e4 | 723 | |
36bcbec7 | 724 | link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); |
1da177e4 | 725 | if (!link) |
d550d98d | 726 | return -ENOMEM; |
1da177e4 LT |
727 | |
728 | link->device = device; | |
1da177e4 LT |
729 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
730 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
731 | acpi_driver_data(device) = link; | |
732 | ||
36e43095 | 733 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
734 | result = acpi_pci_link_get_possible(link); |
735 | if (result) | |
736 | goto end; | |
737 | ||
738 | /* query and set link->irq.active */ | |
739 | acpi_pci_link_get_current(link); | |
740 | ||
0dc070bb | 741 | printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device), |
4be44fcd | 742 | acpi_device_bid(device)); |
1da177e4 LT |
743 | for (i = 0; i < link->irq.possible_count; i++) { |
744 | if (link->irq.active == link->irq.possible[i]) { | |
745 | printk(" *%d", link->irq.possible[i]); | |
746 | found = 1; | |
4be44fcd | 747 | } else |
1da177e4 LT |
748 | printk(" %d", link->irq.possible[i]); |
749 | } | |
750 | ||
751 | printk(")"); | |
752 | ||
753 | if (!found) | |
754 | printk(" *%d", link->irq.active); | |
755 | ||
4be44fcd | 756 | if (!link->device->status.enabled) |
1da177e4 LT |
757 | printk(", disabled."); |
758 | ||
759 | printk("\n"); | |
760 | ||
761 | /* TBD: Acquire/release lock */ | |
762 | list_add_tail(&link->node, &acpi_link.entries); | |
763 | acpi_link.count++; | |
764 | ||
4be44fcd | 765 | end: |
1da177e4 | 766 | /* disable all links -- to be activated on use */ |
67a71365 | 767 | acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL); |
36e43095 | 768 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
769 | |
770 | if (result) | |
771 | kfree(link); | |
772 | ||
d550d98d | 773 | return result; |
1da177e4 LT |
774 | } |
775 | ||
4be44fcd | 776 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 777 | { |
697a2d63 LT |
778 | |
779 | if (link->refcnt && link->irq.active && link->irq.initialized) | |
d550d98d | 780 | return (acpi_pci_link_set(link, link->irq.active)); |
697a2d63 | 781 | else |
d550d98d | 782 | return 0; |
697a2d63 LT |
783 | } |
784 | ||
4be44fcd | 785 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 786 | { |
4be44fcd LB |
787 | struct list_head *node = NULL; |
788 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 789 | |
1da177e4 | 790 | |
56035091 | 791 | /* Make sure SCI is enabled again (Apple firmware bug?) */ |
d8c71b6d | 792 | acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); |
56035091 | 793 | |
1da177e4 | 794 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
795 | link = list_entry(node, struct acpi_pci_link, node); |
796 | if (!link) { | |
6468463a | 797 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
798 | continue; |
799 | } | |
697a2d63 | 800 | acpi_pci_link_resume(link); |
1da177e4 | 801 | } |
d550d98d | 802 | return 0; |
1da177e4 LT |
803 | } |
804 | ||
4be44fcd | 805 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 LT |
806 | { |
807 | struct acpi_pci_link *link = NULL; | |
808 | ||
1da177e4 LT |
809 | |
810 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 811 | return -EINVAL; |
1da177e4 | 812 | |
50dd0969 | 813 | link = acpi_driver_data(device); |
1da177e4 | 814 | |
36e43095 | 815 | mutex_lock(&acpi_link_lock); |
1da177e4 | 816 | list_del(&link->node); |
36e43095 | 817 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
818 | |
819 | kfree(link); | |
820 | ||
d550d98d | 821 | return 0; |
1da177e4 LT |
822 | } |
823 | ||
824 | /* | |
825 | * modify acpi_irq_penalty[] from cmdline | |
826 | */ | |
827 | static int __init acpi_irq_penalty_update(char *str, int used) | |
828 | { | |
829 | int i; | |
830 | ||
831 | for (i = 0; i < 16; i++) { | |
832 | int retval; | |
833 | int irq; | |
834 | ||
4be44fcd | 835 | retval = get_option(&str, &irq); |
1da177e4 LT |
836 | |
837 | if (!retval) | |
838 | break; /* no number found */ | |
839 | ||
840 | if (irq < 0) | |
841 | continue; | |
4be44fcd | 842 | |
1da177e4 LT |
843 | if (irq >= ACPI_MAX_IRQS) |
844 | continue; | |
845 | ||
846 | if (used) | |
847 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
848 | else | |
849 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
850 | ||
851 | if (retval != 2) /* no next number */ | |
852 | break; | |
853 | } | |
854 | return 1; | |
855 | } | |
856 | ||
857 | /* | |
858 | * We'd like PNP to call this routine for the | |
859 | * single ISA_USED value for each legacy device. | |
860 | * But instead it calls us with each POSSIBLE setting. | |
861 | * There is no ISA_POSSIBLE weight, so we simply use | |
862 | * the (small) PCI_USING penalty. | |
863 | */ | |
c9c3e457 | 864 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 865 | { |
c9c3e457 DSL |
866 | if (active) |
867 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
868 | else | |
869 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
1da177e4 LT |
870 | } |
871 | ||
872 | /* | |
873 | * Over-ride default table to reserve additional IRQs for use by ISA | |
874 | * e.g. acpi_irq_isa=5 | |
875 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
876 | */ | |
877 | static int __init acpi_irq_isa(char *str) | |
878 | { | |
879 | return acpi_irq_penalty_update(str, 1); | |
880 | } | |
4be44fcd | 881 | |
1da177e4 LT |
882 | __setup("acpi_irq_isa=", acpi_irq_isa); |
883 | ||
884 | /* | |
885 | * Over-ride default table to free additional IRQs for use by PCI | |
886 | * e.g. acpi_irq_pci=7,15 | |
887 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
888 | */ | |
889 | static int __init acpi_irq_pci(char *str) | |
890 | { | |
891 | return acpi_irq_penalty_update(str, 0); | |
892 | } | |
4be44fcd | 893 | |
1da177e4 LT |
894 | __setup("acpi_irq_pci=", acpi_irq_pci); |
895 | ||
896 | static int __init acpi_irq_nobalance_set(char *str) | |
897 | { | |
898 | acpi_irq_balance = 0; | |
899 | return 1; | |
900 | } | |
4be44fcd | 901 | |
1da177e4 LT |
902 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
903 | ||
904 | int __init acpi_irq_balance_set(char *str) | |
905 | { | |
906 | acpi_irq_balance = 1; | |
907 | return 1; | |
908 | } | |
1da177e4 | 909 | |
4be44fcd | 910 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 911 | |
87bec66b | 912 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 913 | static struct sysdev_class irqrouter_sysdev_class = { |
af5ca3f4 | 914 | .name = "irqrouter", |
4be44fcd | 915 | .resume = irqrouter_resume, |
1da177e4 LT |
916 | }; |
917 | ||
1da177e4 | 918 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
919 | .id = 0, |
920 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
921 | }; |
922 | ||
1da177e4 LT |
923 | static int __init irqrouter_init_sysfs(void) |
924 | { | |
925 | int error; | |
926 | ||
1da177e4 LT |
927 | |
928 | if (acpi_disabled || acpi_noirq) | |
d550d98d | 929 | return 0; |
1da177e4 LT |
930 | |
931 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
932 | if (!error) | |
933 | error = sysdev_register(&device_irqrouter); | |
934 | ||
d550d98d | 935 | return error; |
4be44fcd | 936 | } |
1da177e4 LT |
937 | |
938 | device_initcall(irqrouter_init_sysfs); | |
939 | ||
4be44fcd | 940 | static int __init acpi_pci_link_init(void) |
1da177e4 | 941 | { |
1da177e4 LT |
942 | |
943 | if (acpi_noirq) | |
d550d98d | 944 | return 0; |
1da177e4 LT |
945 | |
946 | acpi_link.count = 0; | |
947 | INIT_LIST_HEAD(&acpi_link.entries); | |
948 | ||
949 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
d550d98d | 950 | return -ENODEV; |
1da177e4 | 951 | |
d550d98d | 952 | return 0; |
1da177e4 LT |
953 | } |
954 | ||
955 | subsys_initcall(acpi_pci_link_init); |