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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 |
4be44fcd | 47 | ACPI_MODULE_NAME("pci_link") |
1da177e4 LT |
48 | #define ACPI_PCI_LINK_CLASS "pci_irq_routing" |
49 | #define ACPI_PCI_LINK_HID "PNP0C0F" | |
50 | #define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver" | |
51 | #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" | |
1da177e4 | 54 | #define ACPI_PCI_LINK_MAX_POSSIBLE 16 |
4be44fcd LB |
55 | static int acpi_pci_link_add(struct acpi_device *device); |
56 | static int acpi_pci_link_remove(struct acpi_device *device, int type); | |
1da177e4 LT |
57 | |
58 | static struct acpi_driver acpi_pci_link_driver = { | |
4be44fcd LB |
59 | .name = ACPI_PCI_LINK_DRIVER_NAME, |
60 | .class = ACPI_PCI_LINK_CLASS, | |
61 | .ids = ACPI_PCI_LINK_HID, | |
62 | .ops = { | |
63 | .add = acpi_pci_link_add, | |
64 | .remove = acpi_pci_link_remove, | |
65 | }, | |
1da177e4 LT |
66 | }; |
67 | ||
87bec66b DSL |
68 | /* |
69 | * If a link is initialized, we never change its active and initialized | |
70 | * later even the link is disable. Instead, we just repick the active irq | |
71 | */ | |
1da177e4 | 72 | struct acpi_pci_link_irq { |
4be44fcd | 73 | u8 active; /* Current IRQ */ |
50eca3eb BM |
74 | u8 triggering; /* All IRQs */ |
75 | u8 polarity; /* All IRQs */ | |
4be44fcd LB |
76 | u8 resource_type; |
77 | u8 possible_count; | |
78 | u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE]; | |
79 | u8 initialized:1; | |
80 | u8 reserved:7; | |
1da177e4 LT |
81 | }; |
82 | ||
83 | struct acpi_pci_link { | |
4be44fcd LB |
84 | struct list_head node; |
85 | struct acpi_device *device; | |
1da177e4 | 86 | struct acpi_pci_link_irq irq; |
4be44fcd | 87 | int refcnt; |
1da177e4 LT |
88 | }; |
89 | ||
90 | static struct { | |
4be44fcd LB |
91 | int count; |
92 | struct list_head entries; | |
93 | } acpi_link; | |
36e43095 | 94 | DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 95 | |
1da177e4 LT |
96 | /* -------------------------------------------------------------------------- |
97 | PCI Link Device Management | |
98 | -------------------------------------------------------------------------- */ | |
99 | ||
100 | /* | |
101 | * set context (link) possible list from resource list | |
102 | */ | |
103 | static acpi_status | |
4be44fcd | 104 | acpi_pci_link_check_possible(struct acpi_resource *resource, void *context) |
1da177e4 | 105 | { |
4be44fcd LB |
106 | struct acpi_pci_link *link = (struct acpi_pci_link *)context; |
107 | u32 i = 0; | |
1da177e4 | 108 | |
1da177e4 | 109 | |
eca008c8 | 110 | switch (resource->type) { |
50eca3eb | 111 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
d550d98d | 112 | return AE_OK; |
50eca3eb | 113 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
114 | { |
115 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 116 | if (!p || !p->interrupt_count) { |
cece9296 | 117 | printk(KERN_WARNING PREFIX "Blank IRQ resource\n"); |
d550d98d | 118 | return AE_OK; |
1da177e4 | 119 | } |
4be44fcd | 120 | for (i = 0; |
50eca3eb | 121 | (i < p->interrupt_count |
4be44fcd LB |
122 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
123 | if (!p->interrupts[i]) { | |
cece9296 LB |
124 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
125 | p->interrupts[i]); | |
4be44fcd LB |
126 | continue; |
127 | } | |
128 | link->irq.possible[i] = p->interrupts[i]; | |
129 | link->irq.possible_count++; | |
130 | } | |
50eca3eb BM |
131 | link->irq.triggering = p->triggering; |
132 | link->irq.polarity = p->polarity; | |
133 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 134 | break; |
1da177e4 | 135 | } |
50eca3eb | 136 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 137 | { |
50eca3eb | 138 | struct acpi_resource_extended_irq *p = |
4be44fcd | 139 | &resource->data.extended_irq; |
50eca3eb | 140 | if (!p || !p->interrupt_count) { |
cece9296 LB |
141 | printk(KERN_WARNING PREFIX |
142 | "Blank EXT IRQ resource\n"); | |
d550d98d | 143 | return AE_OK; |
4be44fcd LB |
144 | } |
145 | for (i = 0; | |
50eca3eb | 146 | (i < p->interrupt_count |
4be44fcd LB |
147 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
148 | if (!p->interrupts[i]) { | |
cece9296 LB |
149 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
150 | p->interrupts[i]); | |
4be44fcd LB |
151 | continue; |
152 | } | |
153 | link->irq.possible[i] = p->interrupts[i]; | |
154 | link->irq.possible_count++; | |
1da177e4 | 155 | } |
50eca3eb BM |
156 | link->irq.triggering = p->triggering; |
157 | link->irq.polarity = p->polarity; | |
158 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 159 | break; |
1da177e4 | 160 | } |
1da177e4 | 161 | default: |
6468463a | 162 | printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n"); |
d550d98d | 163 | return AE_OK; |
1da177e4 LT |
164 | } |
165 | ||
d550d98d | 166 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
167 | } |
168 | ||
4be44fcd | 169 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 170 | { |
4be44fcd | 171 | acpi_status status; |
1da177e4 | 172 | |
1da177e4 LT |
173 | |
174 | if (!link) | |
d550d98d | 175 | return -EINVAL; |
1da177e4 | 176 | |
67a71365 | 177 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS, |
4be44fcd | 178 | acpi_pci_link_check_possible, link); |
1da177e4 | 179 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 180 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 181 | return -ENODEV; |
1da177e4 LT |
182 | } |
183 | ||
4be44fcd LB |
184 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
185 | "Found %d possible IRQs\n", | |
186 | link->irq.possible_count)); | |
1da177e4 | 187 | |
d550d98d | 188 | return 0; |
1da177e4 LT |
189 | } |
190 | ||
1da177e4 | 191 | static acpi_status |
4be44fcd | 192 | acpi_pci_link_check_current(struct acpi_resource *resource, void *context) |
1da177e4 | 193 | { |
4be44fcd | 194 | int *irq = (int *)context; |
1da177e4 | 195 | |
1da177e4 | 196 | |
eca008c8 | 197 | switch (resource->type) { |
50eca3eb | 198 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
199 | { |
200 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 201 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
202 | /* |
203 | * IRQ descriptors may have no IRQ# bits set, | |
204 | * particularly those those w/ _STA disabled | |
205 | */ | |
206 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
207 | "Blank IRQ resource\n")); | |
d550d98d | 208 | return AE_OK; |
4be44fcd LB |
209 | } |
210 | *irq = p->interrupts[0]; | |
211 | break; | |
1da177e4 | 212 | } |
50eca3eb | 213 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 214 | { |
50eca3eb | 215 | struct acpi_resource_extended_irq *p = |
4be44fcd | 216 | &resource->data.extended_irq; |
50eca3eb | 217 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
218 | /* |
219 | * extended IRQ descriptors must | |
220 | * return at least 1 IRQ | |
221 | */ | |
cece9296 LB |
222 | printk(KERN_WARNING PREFIX |
223 | "Blank EXT IRQ resource\n"); | |
d550d98d | 224 | return AE_OK; |
4be44fcd LB |
225 | } |
226 | *irq = p->interrupts[0]; | |
227 | break; | |
1da177e4 | 228 | } |
d4ec6c7c | 229 | break; |
1da177e4 | 230 | default: |
6468463a | 231 | printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type); |
d4ec6c7c | 232 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 233 | return AE_OK; |
1da177e4 | 234 | } |
d550d98d | 235 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
236 | } |
237 | ||
238 | /* | |
239 | * Run _CRS and set link->irq.active | |
240 | * | |
241 | * return value: | |
242 | * 0 - success | |
243 | * !0 - failure | |
244 | */ | |
4be44fcd | 245 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 246 | { |
4be44fcd LB |
247 | int result = 0; |
248 | acpi_status status = AE_OK; | |
249 | int irq = 0; | |
1da177e4 | 250 | |
e0e4e117 | 251 | if (!link) |
d550d98d | 252 | return -EINVAL; |
1da177e4 LT |
253 | |
254 | link->irq.active = 0; | |
255 | ||
256 | /* in practice, status disabled is meaningless, ignore it */ | |
257 | if (acpi_strict) { | |
258 | /* Query _STA, set link->device->status */ | |
259 | result = acpi_bus_get_status(link->device); | |
260 | if (result) { | |
6468463a | 261 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
262 | goto end; |
263 | } | |
264 | ||
265 | if (!link->device->status.enabled) { | |
266 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 267 | return 0; |
1da177e4 LT |
268 | } |
269 | } | |
270 | ||
271 | /* | |
272 | * Query and parse _CRS to get the current IRQ assignment. | |
273 | */ | |
274 | ||
67a71365 | 275 | status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS, |
4be44fcd | 276 | acpi_pci_link_check_current, &irq); |
1da177e4 | 277 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 278 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
279 | result = -ENODEV; |
280 | goto end; | |
281 | } | |
282 | ||
283 | if (acpi_strict && !irq) { | |
6468463a | 284 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
285 | result = -ENODEV; |
286 | } | |
287 | ||
288 | link->irq.active = irq; | |
289 | ||
290 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
291 | ||
4be44fcd | 292 | end: |
d550d98d | 293 | return result; |
1da177e4 LT |
294 | } |
295 | ||
4be44fcd | 296 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 297 | { |
4be44fcd LB |
298 | int result = 0; |
299 | acpi_status status = AE_OK; | |
1da177e4 | 300 | struct { |
4be44fcd LB |
301 | struct acpi_resource res; |
302 | struct acpi_resource end; | |
303 | } *resource; | |
304 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 305 | |
1da177e4 LT |
306 | |
307 | if (!link || !irq) | |
d550d98d | 308 | return -EINVAL; |
1da177e4 | 309 | |
168a328f | 310 | resource = kmalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL); |
4be44fcd | 311 | if (!resource) |
d550d98d | 312 | return -ENOMEM; |
1da177e4 | 313 | |
4be44fcd LB |
314 | memset(resource, 0, sizeof(*resource) + 1); |
315 | buffer.length = sizeof(*resource) + 1; | |
1da177e4 LT |
316 | buffer.pointer = resource; |
317 | ||
4be44fcd | 318 | switch (link->irq.resource_type) { |
50eca3eb BM |
319 | case ACPI_RESOURCE_TYPE_IRQ: |
320 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 321 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
322 | 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 = | |
4be44fcd | 327 | ACPI_EXCLUSIVE; |
1da177e4 | 328 | else |
50eca3eb BM |
329 | resource->res.data.irq.sharable = ACPI_SHARED; |
330 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
331 | resource->res.data.irq.interrupts[0] = irq; |
332 | break; | |
4be44fcd | 333 | |
50eca3eb BM |
334 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
335 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 336 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
337 | resource->res.data.extended_irq.producer_consumer = |
338 | ACPI_CONSUMER; | |
50eca3eb BM |
339 | 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 = | |
4be44fcd | 345 | ACPI_EXCLUSIVE; |
1da177e4 | 346 | else |
50eca3eb BM |
347 | resource->res.data.irq.sharable = ACPI_SHARED; |
348 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
349 | resource->res.data.extended_irq.interrupts[0] = irq; |
350 | /* ignore resource_source, it's optional */ | |
351 | break; | |
352 | default: | |
6468463a | 353 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
354 | result = -EINVAL; |
355 | goto end; | |
356 | ||
357 | } | |
50eca3eb | 358 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
359 | |
360 | /* Attempt to set the resource */ | |
67a71365 | 361 | status = acpi_set_current_resources(link->device->handle, &buffer); |
1da177e4 LT |
362 | |
363 | /* check for total failure */ | |
364 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 365 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
366 | result = -ENODEV; |
367 | goto end; | |
368 | } | |
369 | ||
370 | /* Query _STA, set device->status */ | |
371 | result = acpi_bus_get_status(link->device); | |
372 | if (result) { | |
6468463a | 373 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
374 | goto end; |
375 | } | |
376 | if (!link->device->status.enabled) { | |
cece9296 LB |
377 | printk(KERN_WARNING PREFIX |
378 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 379 | acpi_device_name(link->device), |
cece9296 | 380 | acpi_device_bid(link->device)); |
1da177e4 LT |
381 | } |
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 | */ | |
cece9296 LB |
398 | printk(KERN_WARNING PREFIX |
399 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 400 | acpi_device_name(link->device), |
cece9296 | 401 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
402 | link->irq.active = irq; |
403 | } | |
404 | ||
405 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
406 | |
407 | end: | |
1da177e4 | 408 | kfree(resource); |
d550d98d | 409 | return result; |
1da177e4 LT |
410 | } |
411 | ||
1da177e4 LT |
412 | /* -------------------------------------------------------------------------- |
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 | ||
457 | static 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 */ | |
4be44fcd LB |
461 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
462 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
463 | 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 */ | |
470 | 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 */ | |
4be44fcd | 474 | /* >IRQ15 */ |
1da177e4 LT |
475 | }; |
476 | ||
4be44fcd | 477 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 478 | { |
4be44fcd LB |
479 | struct list_head *node = NULL; |
480 | struct acpi_pci_link *link = NULL; | |
481 | int i = 0; | |
1da177e4 | 482 | |
1da177e4 LT |
483 | |
484 | /* | |
485 | * Update penalties to facilitate IRQ balancing. | |
486 | */ | |
487 | list_for_each(node, &acpi_link.entries) { | |
488 | ||
489 | link = list_entry(node, struct acpi_pci_link, node); | |
490 | if (!link) { | |
6468463a | 491 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
492 | continue; |
493 | } | |
494 | ||
495 | /* | |
496 | * reflect the possible and active irqs in the penalty table -- | |
497 | * useful for breaking ties. | |
498 | */ | |
499 | if (link->irq.possible_count) { | |
4be44fcd LB |
500 | int penalty = |
501 | PIRQ_PENALTY_PCI_POSSIBLE / | |
502 | link->irq.possible_count; | |
1da177e4 LT |
503 | |
504 | for (i = 0; i < link->irq.possible_count; i++) { | |
505 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
506 | acpi_irq_penalty[link->irq. |
507 | possible[i]] += | |
508 | penalty; | |
1da177e4 LT |
509 | } |
510 | ||
511 | } else if (link->irq.active) { | |
4be44fcd LB |
512 | acpi_irq_penalty[link->irq.active] += |
513 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
514 | } |
515 | } | |
516 | /* Add a penalty for the SCI */ | |
517 | acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; | |
518 | ||
d550d98d | 519 | return 0; |
1da177e4 LT |
520 | } |
521 | ||
522 | static int acpi_irq_balance; /* 0: static, 1: balance */ | |
523 | ||
4be44fcd | 524 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 525 | { |
4be44fcd LB |
526 | int irq; |
527 | int i; | |
1da177e4 | 528 | |
1da177e4 | 529 | |
87bec66b DSL |
530 | if (link->irq.initialized) { |
531 | if (link->refcnt == 0) | |
532 | /* This means the link is disabled but initialized */ | |
533 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 534 | return 0; |
87bec66b | 535 | } |
1da177e4 LT |
536 | |
537 | /* | |
538 | * search for active IRQ in list of possible IRQs. | |
539 | */ | |
540 | for (i = 0; i < link->irq.possible_count; ++i) { | |
541 | if (link->irq.active == link->irq.possible[i]) | |
542 | break; | |
543 | } | |
544 | /* | |
545 | * forget active IRQ that is not in possible list | |
546 | */ | |
547 | if (i == link->irq.possible_count) { | |
548 | if (acpi_strict) | |
cece9296 LB |
549 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
550 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
551 | link->irq.active = 0; |
552 | } | |
553 | ||
554 | /* | |
555 | * if active found, use it; else pick entry from end of possible list. | |
556 | */ | |
557 | if (link->irq.active) { | |
558 | irq = link->irq.active; | |
559 | } else { | |
560 | irq = link->irq.possible[link->irq.possible_count - 1]; | |
561 | } | |
562 | ||
563 | if (acpi_irq_balance || !link->irq.active) { | |
564 | /* | |
565 | * Select the best IRQ. This is done in reverse to promote | |
566 | * the use of IRQs 9, 10, 11, and >15. | |
567 | */ | |
568 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
569 | if (acpi_irq_penalty[irq] > |
570 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
571 | irq = link->irq.possible[i]; |
572 | } | |
573 | } | |
574 | ||
575 | /* Attempt to enable the link device at this IRQ. */ | |
576 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
577 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
578 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 579 | acpi_device_name(link->device), |
6468463a | 580 | acpi_device_bid(link->device)); |
d550d98d | 581 | return -ENODEV; |
1da177e4 LT |
582 | } else { |
583 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4be44fcd LB |
584 | printk(PREFIX "%s [%s] enabled at IRQ %d\n", |
585 | acpi_device_name(link->device), | |
586 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
587 | } |
588 | ||
589 | link->irq.initialized = 1; | |
590 | ||
d550d98d | 591 | return 0; |
1da177e4 LT |
592 | } |
593 | ||
594 | /* | |
87bec66b | 595 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
596 | * success: return IRQ >= 0 |
597 | * failure: return -1 | |
598 | */ | |
599 | ||
600 | int | |
4be44fcd LB |
601 | acpi_pci_link_allocate_irq(acpi_handle handle, |
602 | int index, | |
50eca3eb | 603 | int *triggering, int *polarity, char **name) |
1da177e4 | 604 | { |
4be44fcd LB |
605 | int result = 0; |
606 | struct acpi_device *device = NULL; | |
607 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 608 | |
1da177e4 LT |
609 | |
610 | result = acpi_bus_get_device(handle, &device); | |
611 | if (result) { | |
6468463a | 612 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 613 | return -1; |
1da177e4 LT |
614 | } |
615 | ||
4be44fcd | 616 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 617 | if (!link) { |
6468463a | 618 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 619 | return -1; |
1da177e4 LT |
620 | } |
621 | ||
622 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
623 | if (index) { | |
6468463a | 624 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 625 | return -1; |
1da177e4 LT |
626 | } |
627 | ||
36e43095 | 628 | mutex_lock(&acpi_link_lock); |
87bec66b | 629 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 630 | mutex_unlock(&acpi_link_lock); |
d550d98d | 631 | return -1; |
87bec66b | 632 | } |
4be44fcd | 633 | |
1da177e4 | 634 | if (!link->irq.active) { |
36e43095 | 635 | mutex_unlock(&acpi_link_lock); |
6468463a | 636 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 637 | return -1; |
1da177e4 | 638 | } |
4be44fcd | 639 | link->refcnt++; |
36e43095 | 640 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 641 | |
50eca3eb BM |
642 | if (triggering) |
643 | *triggering = link->irq.triggering; | |
644 | if (polarity) | |
645 | *polarity = link->irq.polarity; | |
4be44fcd LB |
646 | if (name) |
647 | *name = acpi_device_bid(link->device); | |
87bec66b | 648 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
649 | "Link %s is referenced\n", |
650 | acpi_device_bid(link->device))); | |
d550d98d | 651 | return (link->irq.active); |
1da177e4 LT |
652 | } |
653 | ||
87bec66b DSL |
654 | /* |
655 | * We don't change link's irq information here. After it is reenabled, we | |
656 | * continue use the info | |
657 | */ | |
4be44fcd | 658 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 659 | { |
4be44fcd LB |
660 | struct acpi_device *device = NULL; |
661 | struct acpi_pci_link *link = NULL; | |
662 | acpi_status result; | |
87bec66b | 663 | |
87bec66b DSL |
664 | |
665 | result = acpi_bus_get_device(handle, &device); | |
666 | if (result) { | |
6468463a | 667 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 668 | return -1; |
87bec66b | 669 | } |
1da177e4 | 670 | |
4be44fcd | 671 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
87bec66b | 672 | if (!link) { |
6468463a | 673 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 674 | return -1; |
87bec66b DSL |
675 | } |
676 | ||
36e43095 | 677 | mutex_lock(&acpi_link_lock); |
87bec66b | 678 | if (!link->irq.initialized) { |
36e43095 | 679 | mutex_unlock(&acpi_link_lock); |
6468463a | 680 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 681 | return -1; |
87bec66b | 682 | } |
ecc21ebe DSL |
683 | #ifdef FUTURE_USE |
684 | /* | |
685 | * The Link reference count allows us to _DISable an unused link | |
686 | * and suspend time, and set it again on resume. | |
687 | * However, 2.6.12 still has irq_router.resume | |
688 | * which blindly restores the link state. | |
689 | * So we disable the reference count method | |
690 | * to prevent duplicate acpi_pci_link_set() | |
691 | * which would harm some systems | |
692 | */ | |
4be44fcd | 693 | link->refcnt--; |
ecc21ebe | 694 | #endif |
87bec66b | 695 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
696 | "Link %s is dereferenced\n", |
697 | acpi_device_bid(link->device))); | |
87bec66b DSL |
698 | |
699 | if (link->refcnt == 0) { | |
67a71365 | 700 | acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL); |
87bec66b | 701 | } |
36e43095 | 702 | mutex_unlock(&acpi_link_lock); |
d550d98d | 703 | return (link->irq.active); |
87bec66b | 704 | } |
4be44fcd | 705 | |
1da177e4 LT |
706 | /* -------------------------------------------------------------------------- |
707 | Driver Interface | |
708 | -------------------------------------------------------------------------- */ | |
709 | ||
4be44fcd | 710 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 711 | { |
4be44fcd LB |
712 | int result = 0; |
713 | struct acpi_pci_link *link = NULL; | |
714 | int i = 0; | |
715 | int found = 0; | |
1da177e4 | 716 | |
1da177e4 LT |
717 | |
718 | if (!device) | |
d550d98d | 719 | return -EINVAL; |
1da177e4 LT |
720 | |
721 | link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); | |
722 | if (!link) | |
d550d98d | 723 | return -ENOMEM; |
1da177e4 LT |
724 | memset(link, 0, sizeof(struct acpi_pci_link)); |
725 | ||
726 | link->device = device; | |
1da177e4 LT |
727 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); |
728 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
729 | acpi_driver_data(device) = link; | |
730 | ||
36e43095 | 731 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
732 | result = acpi_pci_link_get_possible(link); |
733 | if (result) | |
734 | goto end; | |
735 | ||
736 | /* query and set link->irq.active */ | |
737 | acpi_pci_link_get_current(link); | |
738 | ||
739 | printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), | |
4be44fcd | 740 | acpi_device_bid(device)); |
1da177e4 LT |
741 | for (i = 0; i < link->irq.possible_count; i++) { |
742 | if (link->irq.active == link->irq.possible[i]) { | |
743 | printk(" *%d", link->irq.possible[i]); | |
744 | found = 1; | |
4be44fcd | 745 | } else |
1da177e4 LT |
746 | printk(" %d", link->irq.possible[i]); |
747 | } | |
748 | ||
749 | printk(")"); | |
750 | ||
751 | if (!found) | |
752 | printk(" *%d", link->irq.active); | |
753 | ||
4be44fcd | 754 | if (!link->device->status.enabled) |
1da177e4 LT |
755 | printk(", disabled."); |
756 | ||
757 | printk("\n"); | |
758 | ||
759 | /* TBD: Acquire/release lock */ | |
760 | list_add_tail(&link->node, &acpi_link.entries); | |
761 | acpi_link.count++; | |
762 | ||
4be44fcd | 763 | end: |
1da177e4 | 764 | /* disable all links -- to be activated on use */ |
67a71365 | 765 | acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL); |
36e43095 | 766 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
767 | |
768 | if (result) | |
769 | kfree(link); | |
770 | ||
d550d98d | 771 | return result; |
1da177e4 LT |
772 | } |
773 | ||
4be44fcd | 774 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 775 | { |
697a2d63 LT |
776 | |
777 | if (link->refcnt && link->irq.active && link->irq.initialized) | |
d550d98d | 778 | return (acpi_pci_link_set(link, link->irq.active)); |
697a2d63 | 779 | else |
d550d98d | 780 | return 0; |
697a2d63 LT |
781 | } |
782 | ||
4be44fcd | 783 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 784 | { |
4be44fcd LB |
785 | struct list_head *node = NULL; |
786 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 787 | |
1da177e4 | 788 | |
56035091 LT |
789 | /* Make sure SCI is enabled again (Apple firmware bug?) */ |
790 | acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK); | |
791 | ||
1da177e4 | 792 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
793 | link = list_entry(node, struct acpi_pci_link, node); |
794 | if (!link) { | |
6468463a | 795 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
796 | continue; |
797 | } | |
697a2d63 | 798 | acpi_pci_link_resume(link); |
1da177e4 | 799 | } |
d550d98d | 800 | return 0; |
1da177e4 LT |
801 | } |
802 | ||
4be44fcd | 803 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 LT |
804 | { |
805 | struct acpi_pci_link *link = NULL; | |
806 | ||
1da177e4 LT |
807 | |
808 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 809 | return -EINVAL; |
1da177e4 | 810 | |
4be44fcd | 811 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 812 | |
36e43095 | 813 | mutex_lock(&acpi_link_lock); |
1da177e4 | 814 | list_del(&link->node); |
36e43095 | 815 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
816 | |
817 | kfree(link); | |
818 | ||
d550d98d | 819 | return 0; |
1da177e4 LT |
820 | } |
821 | ||
822 | /* | |
823 | * modify acpi_irq_penalty[] from cmdline | |
824 | */ | |
825 | static int __init acpi_irq_penalty_update(char *str, int used) | |
826 | { | |
827 | int i; | |
828 | ||
829 | for (i = 0; i < 16; i++) { | |
830 | int retval; | |
831 | int irq; | |
832 | ||
4be44fcd | 833 | retval = get_option(&str, &irq); |
1da177e4 LT |
834 | |
835 | if (!retval) | |
836 | break; /* no number found */ | |
837 | ||
838 | if (irq < 0) | |
839 | continue; | |
4be44fcd | 840 | |
1da177e4 LT |
841 | if (irq >= ACPI_MAX_IRQS) |
842 | continue; | |
843 | ||
844 | if (used) | |
845 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
846 | else | |
847 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
848 | ||
849 | if (retval != 2) /* no next number */ | |
850 | break; | |
851 | } | |
852 | return 1; | |
853 | } | |
854 | ||
855 | /* | |
856 | * We'd like PNP to call this routine for the | |
857 | * single ISA_USED value for each legacy device. | |
858 | * But instead it calls us with each POSSIBLE setting. | |
859 | * There is no ISA_POSSIBLE weight, so we simply use | |
860 | * the (small) PCI_USING penalty. | |
861 | */ | |
c9c3e457 | 862 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 863 | { |
c9c3e457 DSL |
864 | if (active) |
865 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
866 | else | |
867 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
1da177e4 LT |
868 | } |
869 | ||
870 | /* | |
871 | * Over-ride default table to reserve additional IRQs for use by ISA | |
872 | * e.g. acpi_irq_isa=5 | |
873 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
874 | */ | |
875 | static int __init acpi_irq_isa(char *str) | |
876 | { | |
877 | return acpi_irq_penalty_update(str, 1); | |
878 | } | |
4be44fcd | 879 | |
1da177e4 LT |
880 | __setup("acpi_irq_isa=", acpi_irq_isa); |
881 | ||
882 | /* | |
883 | * Over-ride default table to free additional IRQs for use by PCI | |
884 | * e.g. acpi_irq_pci=7,15 | |
885 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
886 | */ | |
887 | static int __init acpi_irq_pci(char *str) | |
888 | { | |
889 | return acpi_irq_penalty_update(str, 0); | |
890 | } | |
4be44fcd | 891 | |
1da177e4 LT |
892 | __setup("acpi_irq_pci=", acpi_irq_pci); |
893 | ||
894 | static int __init acpi_irq_nobalance_set(char *str) | |
895 | { | |
896 | acpi_irq_balance = 0; | |
897 | return 1; | |
898 | } | |
4be44fcd | 899 | |
1da177e4 LT |
900 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
901 | ||
902 | int __init acpi_irq_balance_set(char *str) | |
903 | { | |
904 | acpi_irq_balance = 1; | |
905 | return 1; | |
906 | } | |
1da177e4 | 907 | |
4be44fcd | 908 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 909 | |
87bec66b | 910 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 911 | static struct sysdev_class irqrouter_sysdev_class = { |
4be44fcd LB |
912 | set_kset_name("irqrouter"), |
913 | .resume = irqrouter_resume, | |
1da177e4 LT |
914 | }; |
915 | ||
1da177e4 | 916 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
917 | .id = 0, |
918 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
919 | }; |
920 | ||
1da177e4 LT |
921 | static int __init irqrouter_init_sysfs(void) |
922 | { | |
923 | int error; | |
924 | ||
1da177e4 LT |
925 | |
926 | if (acpi_disabled || acpi_noirq) | |
d550d98d | 927 | return 0; |
1da177e4 LT |
928 | |
929 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
930 | if (!error) | |
931 | error = sysdev_register(&device_irqrouter); | |
932 | ||
d550d98d | 933 | return error; |
4be44fcd | 934 | } |
1da177e4 LT |
935 | |
936 | device_initcall(irqrouter_init_sysfs); | |
937 | ||
4be44fcd | 938 | static int __init acpi_pci_link_init(void) |
1da177e4 | 939 | { |
1da177e4 LT |
940 | |
941 | if (acpi_noirq) | |
d550d98d | 942 | return 0; |
1da177e4 LT |
943 | |
944 | acpi_link.count = 0; | |
945 | INIT_LIST_HEAD(&acpi_link.entries); | |
946 | ||
947 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
d550d98d | 948 | return -ENODEV; |
1da177e4 | 949 | |
d550d98d | 950 | return 0; |
1da177e4 LT |
951 | } |
952 | ||
953 | subsys_initcall(acpi_pci_link_init); |