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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; | |
86 | acpi_handle handle; | |
1da177e4 | 87 | struct acpi_pci_link_irq irq; |
4be44fcd | 88 | int refcnt; |
1da177e4 LT |
89 | }; |
90 | ||
91 | static struct { | |
4be44fcd LB |
92 | int count; |
93 | struct list_head entries; | |
94 | } acpi_link; | |
36e43095 | 95 | DEFINE_MUTEX(acpi_link_lock); |
1da177e4 | 96 | |
1da177e4 LT |
97 | /* -------------------------------------------------------------------------- |
98 | PCI Link Device Management | |
99 | -------------------------------------------------------------------------- */ | |
100 | ||
101 | /* | |
102 | * set context (link) possible list from resource list | |
103 | */ | |
104 | static acpi_status | |
4be44fcd | 105 | acpi_pci_link_check_possible(struct acpi_resource *resource, void *context) |
1da177e4 | 106 | { |
4be44fcd LB |
107 | struct acpi_pci_link *link = (struct acpi_pci_link *)context; |
108 | u32 i = 0; | |
1da177e4 LT |
109 | |
110 | ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible"); | |
111 | ||
eca008c8 | 112 | switch (resource->type) { |
50eca3eb | 113 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
1da177e4 | 114 | return_ACPI_STATUS(AE_OK); |
50eca3eb | 115 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
116 | { |
117 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 118 | if (!p || !p->interrupt_count) { |
cece9296 | 119 | printk(KERN_WARNING PREFIX "Blank IRQ resource\n"); |
4be44fcd | 120 | return_ACPI_STATUS(AE_OK); |
1da177e4 | 121 | } |
4be44fcd | 122 | for (i = 0; |
50eca3eb | 123 | (i < p->interrupt_count |
4be44fcd LB |
124 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
125 | if (!p->interrupts[i]) { | |
cece9296 LB |
126 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
127 | p->interrupts[i]); | |
4be44fcd LB |
128 | continue; |
129 | } | |
130 | link->irq.possible[i] = p->interrupts[i]; | |
131 | link->irq.possible_count++; | |
132 | } | |
50eca3eb BM |
133 | link->irq.triggering = p->triggering; |
134 | link->irq.polarity = p->polarity; | |
135 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 136 | break; |
1da177e4 | 137 | } |
50eca3eb | 138 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 139 | { |
50eca3eb | 140 | struct acpi_resource_extended_irq *p = |
4be44fcd | 141 | &resource->data.extended_irq; |
50eca3eb | 142 | if (!p || !p->interrupt_count) { |
cece9296 LB |
143 | printk(KERN_WARNING PREFIX |
144 | "Blank EXT IRQ resource\n"); | |
4be44fcd LB |
145 | return_ACPI_STATUS(AE_OK); |
146 | } | |
147 | for (i = 0; | |
50eca3eb | 148 | (i < p->interrupt_count |
4be44fcd LB |
149 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
150 | if (!p->interrupts[i]) { | |
cece9296 LB |
151 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
152 | p->interrupts[i]); | |
4be44fcd LB |
153 | continue; |
154 | } | |
155 | link->irq.possible[i] = p->interrupts[i]; | |
156 | link->irq.possible_count++; | |
1da177e4 | 157 | } |
50eca3eb BM |
158 | link->irq.triggering = p->triggering; |
159 | link->irq.polarity = p->polarity; | |
160 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 161 | break; |
1da177e4 | 162 | } |
1da177e4 | 163 | default: |
6468463a | 164 | printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n"); |
1da177e4 LT |
165 | return_ACPI_STATUS(AE_OK); |
166 | } | |
167 | ||
168 | return_ACPI_STATUS(AE_CTRL_TERMINATE); | |
169 | } | |
170 | ||
4be44fcd | 171 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 172 | { |
4be44fcd | 173 | acpi_status status; |
1da177e4 LT |
174 | |
175 | ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible"); | |
176 | ||
177 | if (!link) | |
178 | return_VALUE(-EINVAL); | |
179 | ||
180 | status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, | |
4be44fcd | 181 | acpi_pci_link_check_possible, link); |
1da177e4 | 182 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 183 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
1da177e4 LT |
184 | return_VALUE(-ENODEV); |
185 | } | |
186 | ||
4be44fcd LB |
187 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
188 | "Found %d possible IRQs\n", | |
189 | link->irq.possible_count)); | |
1da177e4 LT |
190 | |
191 | return_VALUE(0); | |
192 | } | |
193 | ||
1da177e4 | 194 | static acpi_status |
4be44fcd | 195 | acpi_pci_link_check_current(struct acpi_resource *resource, void *context) |
1da177e4 | 196 | { |
4be44fcd | 197 | int *irq = (int *)context; |
1da177e4 LT |
198 | |
199 | ACPI_FUNCTION_TRACE("acpi_pci_link_check_current"); | |
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")); | |
212 | return_ACPI_STATUS(AE_OK); | |
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"); | |
4be44fcd LB |
228 | return_ACPI_STATUS(AE_OK); |
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: |
1da177e4 LT |
237 | return_ACPI_STATUS(AE_OK); |
238 | } | |
239 | return_ACPI_STATUS(AE_CTRL_TERMINATE); | |
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 LT |
254 | |
255 | ACPI_FUNCTION_TRACE("acpi_pci_link_get_current"); | |
256 | ||
257 | if (!link || !link->handle) | |
258 | return_VALUE(-EINVAL); | |
259 | ||
260 | link->irq.active = 0; | |
261 | ||
262 | /* in practice, status disabled is meaningless, ignore it */ | |
263 | if (acpi_strict) { | |
264 | /* Query _STA, set link->device->status */ | |
265 | result = acpi_bus_get_status(link->device); | |
266 | if (result) { | |
6468463a | 267 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
268 | goto end; |
269 | } | |
270 | ||
271 | if (!link->device->status.enabled) { | |
272 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
273 | return_VALUE(0); | |
274 | } | |
275 | } | |
276 | ||
277 | /* | |
278 | * Query and parse _CRS to get the current IRQ assignment. | |
279 | */ | |
280 | ||
281 | status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, | |
4be44fcd | 282 | acpi_pci_link_check_current, &irq); |
1da177e4 | 283 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 284 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
285 | result = -ENODEV; |
286 | goto end; | |
287 | } | |
288 | ||
289 | if (acpi_strict && !irq) { | |
6468463a | 290 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
291 | result = -ENODEV; |
292 | } | |
293 | ||
294 | link->irq.active = irq; | |
295 | ||
296 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
297 | ||
4be44fcd | 298 | end: |
1da177e4 LT |
299 | return_VALUE(result); |
300 | } | |
301 | ||
4be44fcd | 302 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 303 | { |
4be44fcd LB |
304 | int result = 0; |
305 | acpi_status status = AE_OK; | |
1da177e4 | 306 | struct { |
4be44fcd LB |
307 | struct acpi_resource res; |
308 | struct acpi_resource end; | |
309 | } *resource; | |
310 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 LT |
311 | |
312 | ACPI_FUNCTION_TRACE("acpi_pci_link_set"); | |
313 | ||
314 | if (!link || !irq) | |
315 | return_VALUE(-EINVAL); | |
316 | ||
a64882e7 | 317 | resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC); |
4be44fcd | 318 | if (!resource) |
1da177e4 LT |
319 | return_VALUE(-ENOMEM); |
320 | ||
4be44fcd LB |
321 | memset(resource, 0, sizeof(*resource) + 1); |
322 | buffer.length = sizeof(*resource) + 1; | |
1da177e4 LT |
323 | buffer.pointer = resource; |
324 | ||
4be44fcd | 325 | switch (link->irq.resource_type) { |
50eca3eb BM |
326 | case ACPI_RESOURCE_TYPE_IRQ: |
327 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 328 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
329 | resource->res.data.irq.triggering = link->irq.triggering; |
330 | resource->res.data.irq.polarity = | |
331 | link->irq.polarity; | |
332 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
333 | resource->res.data.irq.sharable = | |
4be44fcd | 334 | ACPI_EXCLUSIVE; |
1da177e4 | 335 | else |
50eca3eb BM |
336 | resource->res.data.irq.sharable = ACPI_SHARED; |
337 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
338 | resource->res.data.irq.interrupts[0] = irq; |
339 | break; | |
4be44fcd | 340 | |
50eca3eb BM |
341 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
342 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 343 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
344 | resource->res.data.extended_irq.producer_consumer = |
345 | ACPI_CONSUMER; | |
50eca3eb BM |
346 | resource->res.data.extended_irq.triggering = |
347 | link->irq.triggering; | |
348 | resource->res.data.extended_irq.polarity = | |
349 | link->irq.polarity; | |
350 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
351 | resource->res.data.irq.sharable = | |
4be44fcd | 352 | ACPI_EXCLUSIVE; |
1da177e4 | 353 | else |
50eca3eb BM |
354 | resource->res.data.irq.sharable = ACPI_SHARED; |
355 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
356 | resource->res.data.extended_irq.interrupts[0] = irq; |
357 | /* ignore resource_source, it's optional */ | |
358 | break; | |
359 | default: | |
6468463a | 360 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
361 | result = -EINVAL; |
362 | goto end; | |
363 | ||
364 | } | |
50eca3eb | 365 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
366 | |
367 | /* Attempt to set the resource */ | |
368 | status = acpi_set_current_resources(link->handle, &buffer); | |
369 | ||
370 | /* check for total failure */ | |
371 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 372 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
373 | result = -ENODEV; |
374 | goto end; | |
375 | } | |
376 | ||
377 | /* Query _STA, set device->status */ | |
378 | result = acpi_bus_get_status(link->device); | |
379 | if (result) { | |
6468463a | 380 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
381 | goto end; |
382 | } | |
383 | if (!link->device->status.enabled) { | |
cece9296 LB |
384 | printk(KERN_WARNING PREFIX |
385 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 386 | acpi_device_name(link->device), |
cece9296 | 387 | acpi_device_bid(link->device)); |
1da177e4 LT |
388 | } |
389 | ||
390 | /* Query _CRS, set link->irq.active */ | |
391 | result = acpi_pci_link_get_current(link); | |
392 | if (result) { | |
393 | goto end; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Is current setting not what we set? | |
398 | * set link->irq.active | |
399 | */ | |
400 | if (link->irq.active != irq) { | |
401 | /* | |
402 | * policy: when _CRS doesn't return what we just _SRS | |
403 | * assume _SRS worked and override _CRS value. | |
404 | */ | |
cece9296 LB |
405 | printk(KERN_WARNING PREFIX |
406 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 407 | acpi_device_name(link->device), |
cece9296 | 408 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
409 | link->irq.active = irq; |
410 | } | |
411 | ||
412 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
413 | |
414 | end: | |
1da177e4 LT |
415 | kfree(resource); |
416 | return_VALUE(result); | |
417 | } | |
418 | ||
1da177e4 LT |
419 | /* -------------------------------------------------------------------------- |
420 | PCI Link IRQ Management | |
421 | -------------------------------------------------------------------------- */ | |
422 | ||
423 | /* | |
424 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
425 | * Link Devices to move the PIRQs around to minimize sharing. | |
426 | * | |
427 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
428 | * that the BIOS has already set to active. This is necessary because | |
429 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
430 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
431 | * even if acpi_irq_nobalance is set. | |
432 | * | |
433 | * A tables of penalties avoids directing PCI interrupts to well known | |
434 | * ISA IRQs. Boot params are available to over-ride the default table: | |
435 | * | |
436 | * List interrupts that are free for PCI use. | |
437 | * acpi_irq_pci=n[,m] | |
438 | * | |
439 | * List interrupts that should not be used for PCI: | |
440 | * acpi_irq_isa=n[,m] | |
441 | * | |
442 | * Note that PCI IRQ routers have a list of possible IRQs, | |
443 | * which may not include the IRQs this table says are available. | |
444 | * | |
445 | * Since this heuristic can't tell the difference between a link | |
446 | * that no device will attach to, vs. a link which may be shared | |
447 | * by multiple active devices -- it is not optimal. | |
448 | * | |
449 | * If interrupt performance is that important, get an IO-APIC system | |
450 | * with a pin dedicated to each device. Or for that matter, an MSI | |
451 | * enabled system. | |
452 | */ | |
453 | ||
454 | #define ACPI_MAX_IRQS 256 | |
455 | #define ACPI_MAX_ISA_IRQ 16 | |
456 | ||
457 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
458 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
459 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
460 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
461 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
462 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
463 | ||
464 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
465 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
466 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
467 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
468 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
469 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
470 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
471 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
472 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
473 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
474 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
475 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
476 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
477 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ | |
478 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
479 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
480 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 481 | /* >IRQ15 */ |
1da177e4 LT |
482 | }; |
483 | ||
4be44fcd | 484 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 485 | { |
4be44fcd LB |
486 | struct list_head *node = NULL; |
487 | struct acpi_pci_link *link = NULL; | |
488 | int i = 0; | |
1da177e4 LT |
489 | |
490 | ACPI_FUNCTION_TRACE("acpi_irq_penalty_init"); | |
491 | ||
492 | /* | |
493 | * Update penalties to facilitate IRQ balancing. | |
494 | */ | |
495 | list_for_each(node, &acpi_link.entries) { | |
496 | ||
497 | link = list_entry(node, struct acpi_pci_link, node); | |
498 | if (!link) { | |
6468463a | 499 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
500 | continue; |
501 | } | |
502 | ||
503 | /* | |
504 | * reflect the possible and active irqs in the penalty table -- | |
505 | * useful for breaking ties. | |
506 | */ | |
507 | if (link->irq.possible_count) { | |
4be44fcd LB |
508 | int penalty = |
509 | PIRQ_PENALTY_PCI_POSSIBLE / | |
510 | link->irq.possible_count; | |
1da177e4 LT |
511 | |
512 | for (i = 0; i < link->irq.possible_count; i++) { | |
513 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
514 | acpi_irq_penalty[link->irq. |
515 | possible[i]] += | |
516 | penalty; | |
1da177e4 LT |
517 | } |
518 | ||
519 | } else if (link->irq.active) { | |
4be44fcd LB |
520 | acpi_irq_penalty[link->irq.active] += |
521 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
522 | } |
523 | } | |
524 | /* Add a penalty for the SCI */ | |
525 | acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; | |
526 | ||
527 | return_VALUE(0); | |
528 | } | |
529 | ||
530 | static int acpi_irq_balance; /* 0: static, 1: balance */ | |
531 | ||
4be44fcd | 532 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 533 | { |
4be44fcd LB |
534 | int irq; |
535 | int i; | |
1da177e4 LT |
536 | |
537 | ACPI_FUNCTION_TRACE("acpi_pci_link_allocate"); | |
538 | ||
87bec66b DSL |
539 | if (link->irq.initialized) { |
540 | if (link->refcnt == 0) | |
541 | /* This means the link is disabled but initialized */ | |
542 | acpi_pci_link_set(link, link->irq.active); | |
1da177e4 | 543 | return_VALUE(0); |
87bec66b | 544 | } |
1da177e4 LT |
545 | |
546 | /* | |
547 | * search for active IRQ in list of possible IRQs. | |
548 | */ | |
549 | for (i = 0; i < link->irq.possible_count; ++i) { | |
550 | if (link->irq.active == link->irq.possible[i]) | |
551 | break; | |
552 | } | |
553 | /* | |
554 | * forget active IRQ that is not in possible list | |
555 | */ | |
556 | if (i == link->irq.possible_count) { | |
557 | if (acpi_strict) | |
cece9296 LB |
558 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
559 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
560 | link->irq.active = 0; |
561 | } | |
562 | ||
563 | /* | |
564 | * if active found, use it; else pick entry from end of possible list. | |
565 | */ | |
566 | if (link->irq.active) { | |
567 | irq = link->irq.active; | |
568 | } else { | |
569 | irq = link->irq.possible[link->irq.possible_count - 1]; | |
570 | } | |
571 | ||
572 | if (acpi_irq_balance || !link->irq.active) { | |
573 | /* | |
574 | * Select the best IRQ. This is done in reverse to promote | |
575 | * the use of IRQs 9, 10, 11, and >15. | |
576 | */ | |
577 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
578 | if (acpi_irq_penalty[irq] > |
579 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
580 | irq = link->irq.possible[i]; |
581 | } | |
582 | } | |
583 | ||
584 | /* Attempt to enable the link device at this IRQ. */ | |
585 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
586 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
587 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 588 | acpi_device_name(link->device), |
6468463a | 589 | acpi_device_bid(link->device)); |
1da177e4 LT |
590 | return_VALUE(-ENODEV); |
591 | } else { | |
592 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4be44fcd LB |
593 | printk(PREFIX "%s [%s] enabled at IRQ %d\n", |
594 | acpi_device_name(link->device), | |
595 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
596 | } |
597 | ||
598 | link->irq.initialized = 1; | |
599 | ||
600 | return_VALUE(0); | |
601 | } | |
602 | ||
603 | /* | |
87bec66b | 604 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
605 | * success: return IRQ >= 0 |
606 | * failure: return -1 | |
607 | */ | |
608 | ||
609 | int | |
4be44fcd LB |
610 | acpi_pci_link_allocate_irq(acpi_handle handle, |
611 | int index, | |
50eca3eb | 612 | int *triggering, int *polarity, char **name) |
1da177e4 | 613 | { |
4be44fcd LB |
614 | int result = 0; |
615 | struct acpi_device *device = NULL; | |
616 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 617 | |
87bec66b | 618 | ACPI_FUNCTION_TRACE("acpi_pci_link_allocate_irq"); |
1da177e4 LT |
619 | |
620 | result = acpi_bus_get_device(handle, &device); | |
621 | if (result) { | |
6468463a | 622 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
1da177e4 LT |
623 | return_VALUE(-1); |
624 | } | |
625 | ||
4be44fcd | 626 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 627 | if (!link) { |
6468463a | 628 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
629 | return_VALUE(-1); |
630 | } | |
631 | ||
632 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
633 | if (index) { | |
6468463a | 634 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
1da177e4 LT |
635 | return_VALUE(-1); |
636 | } | |
637 | ||
36e43095 | 638 | mutex_lock(&acpi_link_lock); |
87bec66b | 639 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 640 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 641 | return_VALUE(-1); |
87bec66b | 642 | } |
4be44fcd | 643 | |
1da177e4 | 644 | if (!link->irq.active) { |
36e43095 | 645 | mutex_unlock(&acpi_link_lock); |
6468463a | 646 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
1da177e4 LT |
647 | return_VALUE(-1); |
648 | } | |
4be44fcd | 649 | link->refcnt++; |
36e43095 | 650 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 651 | |
50eca3eb BM |
652 | if (triggering) |
653 | *triggering = link->irq.triggering; | |
654 | if (polarity) | |
655 | *polarity = link->irq.polarity; | |
4be44fcd LB |
656 | if (name) |
657 | *name = acpi_device_bid(link->device); | |
87bec66b | 658 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
659 | "Link %s is referenced\n", |
660 | acpi_device_bid(link->device))); | |
1da177e4 LT |
661 | return_VALUE(link->irq.active); |
662 | } | |
663 | ||
87bec66b DSL |
664 | /* |
665 | * We don't change link's irq information here. After it is reenabled, we | |
666 | * continue use the info | |
667 | */ | |
4be44fcd | 668 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 669 | { |
4be44fcd LB |
670 | struct acpi_device *device = NULL; |
671 | struct acpi_pci_link *link = NULL; | |
672 | acpi_status result; | |
87bec66b DSL |
673 | |
674 | ACPI_FUNCTION_TRACE("acpi_pci_link_free_irq"); | |
675 | ||
676 | result = acpi_bus_get_device(handle, &device); | |
677 | if (result) { | |
6468463a | 678 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
87bec66b DSL |
679 | return_VALUE(-1); |
680 | } | |
1da177e4 | 681 | |
4be44fcd | 682 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
87bec66b | 683 | if (!link) { |
6468463a | 684 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
87bec66b DSL |
685 | return_VALUE(-1); |
686 | } | |
687 | ||
36e43095 | 688 | mutex_lock(&acpi_link_lock); |
87bec66b | 689 | if (!link->irq.initialized) { |
36e43095 | 690 | mutex_unlock(&acpi_link_lock); |
6468463a | 691 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
87bec66b DSL |
692 | return_VALUE(-1); |
693 | } | |
ecc21ebe DSL |
694 | #ifdef FUTURE_USE |
695 | /* | |
696 | * The Link reference count allows us to _DISable an unused link | |
697 | * and suspend time, and set it again on resume. | |
698 | * However, 2.6.12 still has irq_router.resume | |
699 | * which blindly restores the link state. | |
700 | * So we disable the reference count method | |
701 | * to prevent duplicate acpi_pci_link_set() | |
702 | * which would harm some systems | |
703 | */ | |
4be44fcd | 704 | link->refcnt--; |
ecc21ebe | 705 | #endif |
87bec66b | 706 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
707 | "Link %s is dereferenced\n", |
708 | acpi_device_bid(link->device))); | |
87bec66b DSL |
709 | |
710 | if (link->refcnt == 0) { | |
711 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
712 | } | |
36e43095 | 713 | mutex_unlock(&acpi_link_lock); |
87bec66b DSL |
714 | return_VALUE(link->irq.active); |
715 | } | |
4be44fcd | 716 | |
1da177e4 LT |
717 | /* -------------------------------------------------------------------------- |
718 | Driver Interface | |
719 | -------------------------------------------------------------------------- */ | |
720 | ||
4be44fcd | 721 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 722 | { |
4be44fcd LB |
723 | int result = 0; |
724 | struct acpi_pci_link *link = NULL; | |
725 | int i = 0; | |
726 | int found = 0; | |
1da177e4 LT |
727 | |
728 | ACPI_FUNCTION_TRACE("acpi_pci_link_add"); | |
729 | ||
730 | if (!device) | |
731 | return_VALUE(-EINVAL); | |
732 | ||
733 | link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); | |
734 | if (!link) | |
735 | return_VALUE(-ENOMEM); | |
736 | memset(link, 0, sizeof(struct acpi_pci_link)); | |
737 | ||
738 | link->device = device; | |
739 | link->handle = device->handle; | |
740 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); | |
741 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
742 | acpi_driver_data(device) = link; | |
743 | ||
36e43095 | 744 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
745 | result = acpi_pci_link_get_possible(link); |
746 | if (result) | |
747 | goto end; | |
748 | ||
749 | /* query and set link->irq.active */ | |
750 | acpi_pci_link_get_current(link); | |
751 | ||
752 | printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), | |
4be44fcd | 753 | acpi_device_bid(device)); |
1da177e4 LT |
754 | for (i = 0; i < link->irq.possible_count; i++) { |
755 | if (link->irq.active == link->irq.possible[i]) { | |
756 | printk(" *%d", link->irq.possible[i]); | |
757 | found = 1; | |
4be44fcd | 758 | } else |
1da177e4 LT |
759 | printk(" %d", link->irq.possible[i]); |
760 | } | |
761 | ||
762 | printk(")"); | |
763 | ||
764 | if (!found) | |
765 | printk(" *%d", link->irq.active); | |
766 | ||
4be44fcd | 767 | if (!link->device->status.enabled) |
1da177e4 LT |
768 | printk(", disabled."); |
769 | ||
770 | printk("\n"); | |
771 | ||
772 | /* TBD: Acquire/release lock */ | |
773 | list_add_tail(&link->node, &acpi_link.entries); | |
774 | acpi_link.count++; | |
775 | ||
4be44fcd | 776 | end: |
1da177e4 LT |
777 | /* disable all links -- to be activated on use */ |
778 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
36e43095 | 779 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
780 | |
781 | if (result) | |
782 | kfree(link); | |
783 | ||
784 | return_VALUE(result); | |
785 | } | |
786 | ||
4be44fcd | 787 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 LT |
788 | { |
789 | ACPI_FUNCTION_TRACE("acpi_pci_link_resume"); | |
790 | ||
791 | if (link->refcnt && link->irq.active && link->irq.initialized) | |
792 | return_VALUE(acpi_pci_link_set(link, link->irq.active)); | |
793 | else | |
794 | return_VALUE(0); | |
795 | } | |
796 | ||
11e981f1 DSL |
797 | /* |
798 | * FIXME: this is a workaround to avoid nasty warning. It will be removed | |
799 | * after every device calls pci_disable_device in .resume. | |
800 | */ | |
801 | int acpi_in_resume; | |
4be44fcd | 802 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 803 | { |
4be44fcd LB |
804 | struct list_head *node = NULL; |
805 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 806 | |
697a2d63 | 807 | ACPI_FUNCTION_TRACE("irqrouter_resume"); |
1da177e4 | 808 | |
56035091 LT |
809 | /* Make sure SCI is enabled again (Apple firmware bug?) */ |
810 | acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK); | |
811 | ||
11e981f1 | 812 | acpi_in_resume = 1; |
1da177e4 | 813 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
814 | link = list_entry(node, struct acpi_pci_link, node); |
815 | if (!link) { | |
6468463a | 816 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
817 | continue; |
818 | } | |
697a2d63 | 819 | acpi_pci_link_resume(link); |
1da177e4 | 820 | } |
11e981f1 | 821 | acpi_in_resume = 0; |
697a2d63 | 822 | return_VALUE(0); |
1da177e4 LT |
823 | } |
824 | ||
4be44fcd | 825 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 LT |
826 | { |
827 | struct acpi_pci_link *link = NULL; | |
828 | ||
829 | ACPI_FUNCTION_TRACE("acpi_pci_link_remove"); | |
830 | ||
831 | if (!device || !acpi_driver_data(device)) | |
832 | return_VALUE(-EINVAL); | |
833 | ||
4be44fcd | 834 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 835 | |
36e43095 | 836 | mutex_lock(&acpi_link_lock); |
1da177e4 | 837 | list_del(&link->node); |
36e43095 | 838 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
839 | |
840 | kfree(link); | |
841 | ||
842 | return_VALUE(0); | |
843 | } | |
844 | ||
845 | /* | |
846 | * modify acpi_irq_penalty[] from cmdline | |
847 | */ | |
848 | static int __init acpi_irq_penalty_update(char *str, int used) | |
849 | { | |
850 | int i; | |
851 | ||
852 | for (i = 0; i < 16; i++) { | |
853 | int retval; | |
854 | int irq; | |
855 | ||
4be44fcd | 856 | retval = get_option(&str, &irq); |
1da177e4 LT |
857 | |
858 | if (!retval) | |
859 | break; /* no number found */ | |
860 | ||
861 | if (irq < 0) | |
862 | continue; | |
4be44fcd | 863 | |
1da177e4 LT |
864 | if (irq >= ACPI_MAX_IRQS) |
865 | continue; | |
866 | ||
867 | if (used) | |
868 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
869 | else | |
870 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
871 | ||
872 | if (retval != 2) /* no next number */ | |
873 | break; | |
874 | } | |
875 | return 1; | |
876 | } | |
877 | ||
878 | /* | |
879 | * We'd like PNP to call this routine for the | |
880 | * single ISA_USED value for each legacy device. | |
881 | * But instead it calls us with each POSSIBLE setting. | |
882 | * There is no ISA_POSSIBLE weight, so we simply use | |
883 | * the (small) PCI_USING penalty. | |
884 | */ | |
c9c3e457 | 885 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 886 | { |
c9c3e457 DSL |
887 | if (active) |
888 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
889 | else | |
890 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
1da177e4 LT |
891 | } |
892 | ||
893 | /* | |
894 | * Over-ride default table to reserve additional IRQs for use by ISA | |
895 | * e.g. acpi_irq_isa=5 | |
896 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
897 | */ | |
898 | static int __init acpi_irq_isa(char *str) | |
899 | { | |
900 | return acpi_irq_penalty_update(str, 1); | |
901 | } | |
4be44fcd | 902 | |
1da177e4 LT |
903 | __setup("acpi_irq_isa=", acpi_irq_isa); |
904 | ||
905 | /* | |
906 | * Over-ride default table to free additional IRQs for use by PCI | |
907 | * e.g. acpi_irq_pci=7,15 | |
908 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
909 | */ | |
910 | static int __init acpi_irq_pci(char *str) | |
911 | { | |
912 | return acpi_irq_penalty_update(str, 0); | |
913 | } | |
4be44fcd | 914 | |
1da177e4 LT |
915 | __setup("acpi_irq_pci=", acpi_irq_pci); |
916 | ||
917 | static int __init acpi_irq_nobalance_set(char *str) | |
918 | { | |
919 | acpi_irq_balance = 0; | |
920 | return 1; | |
921 | } | |
4be44fcd | 922 | |
1da177e4 LT |
923 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
924 | ||
925 | int __init acpi_irq_balance_set(char *str) | |
926 | { | |
927 | acpi_irq_balance = 1; | |
928 | return 1; | |
929 | } | |
1da177e4 | 930 | |
4be44fcd | 931 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 932 | |
87bec66b | 933 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 934 | static struct sysdev_class irqrouter_sysdev_class = { |
4be44fcd LB |
935 | set_kset_name("irqrouter"), |
936 | .resume = irqrouter_resume, | |
1da177e4 LT |
937 | }; |
938 | ||
1da177e4 | 939 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
940 | .id = 0, |
941 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
942 | }; |
943 | ||
1da177e4 LT |
944 | static int __init irqrouter_init_sysfs(void) |
945 | { | |
946 | int error; | |
947 | ||
948 | ACPI_FUNCTION_TRACE("irqrouter_init_sysfs"); | |
949 | ||
950 | if (acpi_disabled || acpi_noirq) | |
951 | return_VALUE(0); | |
952 | ||
953 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
954 | if (!error) | |
955 | error = sysdev_register(&device_irqrouter); | |
956 | ||
957 | return_VALUE(error); | |
4be44fcd | 958 | } |
1da177e4 LT |
959 | |
960 | device_initcall(irqrouter_init_sysfs); | |
961 | ||
4be44fcd | 962 | static int __init acpi_pci_link_init(void) |
1da177e4 LT |
963 | { |
964 | ACPI_FUNCTION_TRACE("acpi_pci_link_init"); | |
965 | ||
966 | if (acpi_noirq) | |
967 | return_VALUE(0); | |
968 | ||
969 | acpi_link.count = 0; | |
970 | INIT_LIST_HEAD(&acpi_link.entries); | |
971 | ||
972 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
973 | return_VALUE(-ENODEV); | |
974 | ||
975 | return_VALUE(0); | |
976 | } | |
977 | ||
978 | subsys_initcall(acpi_pci_link_init); |