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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 | 109 | |
1da177e4 | 110 | |
eca008c8 | 111 | switch (resource->type) { |
50eca3eb | 112 | case ACPI_RESOURCE_TYPE_START_DEPENDENT: |
d550d98d | 113 | return AE_OK; |
50eca3eb | 114 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
115 | { |
116 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 117 | if (!p || !p->interrupt_count) { |
cece9296 | 118 | printk(KERN_WARNING PREFIX "Blank IRQ resource\n"); |
d550d98d | 119 | return AE_OK; |
1da177e4 | 120 | } |
4be44fcd | 121 | for (i = 0; |
50eca3eb | 122 | (i < p->interrupt_count |
4be44fcd LB |
123 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
124 | if (!p->interrupts[i]) { | |
cece9296 LB |
125 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
126 | p->interrupts[i]); | |
4be44fcd LB |
127 | continue; |
128 | } | |
129 | link->irq.possible[i] = p->interrupts[i]; | |
130 | link->irq.possible_count++; | |
131 | } | |
50eca3eb BM |
132 | link->irq.triggering = p->triggering; |
133 | link->irq.polarity = p->polarity; | |
134 | link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ; | |
4be44fcd | 135 | break; |
1da177e4 | 136 | } |
50eca3eb | 137 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 138 | { |
50eca3eb | 139 | struct acpi_resource_extended_irq *p = |
4be44fcd | 140 | &resource->data.extended_irq; |
50eca3eb | 141 | if (!p || !p->interrupt_count) { |
cece9296 LB |
142 | printk(KERN_WARNING PREFIX |
143 | "Blank EXT IRQ resource\n"); | |
d550d98d | 144 | return AE_OK; |
4be44fcd LB |
145 | } |
146 | for (i = 0; | |
50eca3eb | 147 | (i < p->interrupt_count |
4be44fcd LB |
148 | && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) { |
149 | if (!p->interrupts[i]) { | |
cece9296 LB |
150 | printk(KERN_WARNING PREFIX "Invalid IRQ %d\n", |
151 | p->interrupts[i]); | |
4be44fcd LB |
152 | continue; |
153 | } | |
154 | link->irq.possible[i] = p->interrupts[i]; | |
155 | link->irq.possible_count++; | |
1da177e4 | 156 | } |
50eca3eb BM |
157 | link->irq.triggering = p->triggering; |
158 | link->irq.polarity = p->polarity; | |
159 | link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
4be44fcd | 160 | break; |
1da177e4 | 161 | } |
1da177e4 | 162 | default: |
6468463a | 163 | printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n"); |
d550d98d | 164 | return AE_OK; |
1da177e4 LT |
165 | } |
166 | ||
d550d98d | 167 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
168 | } |
169 | ||
4be44fcd | 170 | static int acpi_pci_link_get_possible(struct acpi_pci_link *link) |
1da177e4 | 171 | { |
4be44fcd | 172 | acpi_status status; |
1da177e4 | 173 | |
1da177e4 LT |
174 | |
175 | if (!link) | |
d550d98d | 176 | return -EINVAL; |
1da177e4 LT |
177 | |
178 | status = acpi_walk_resources(link->handle, METHOD_NAME__PRS, | |
4be44fcd | 179 | acpi_pci_link_check_possible, link); |
1da177e4 | 180 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 181 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS")); |
d550d98d | 182 | return -ENODEV; |
1da177e4 LT |
183 | } |
184 | ||
4be44fcd LB |
185 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
186 | "Found %d possible IRQs\n", | |
187 | link->irq.possible_count)); | |
1da177e4 | 188 | |
d550d98d | 189 | return 0; |
1da177e4 LT |
190 | } |
191 | ||
1da177e4 | 192 | static acpi_status |
4be44fcd | 193 | acpi_pci_link_check_current(struct acpi_resource *resource, void *context) |
1da177e4 | 194 | { |
4be44fcd | 195 | int *irq = (int *)context; |
1da177e4 | 196 | |
1da177e4 | 197 | |
eca008c8 | 198 | switch (resource->type) { |
50eca3eb | 199 | case ACPI_RESOURCE_TYPE_IRQ: |
4be44fcd LB |
200 | { |
201 | struct acpi_resource_irq *p = &resource->data.irq; | |
50eca3eb | 202 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
203 | /* |
204 | * IRQ descriptors may have no IRQ# bits set, | |
205 | * particularly those those w/ _STA disabled | |
206 | */ | |
207 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
208 | "Blank IRQ resource\n")); | |
d550d98d | 209 | return AE_OK; |
4be44fcd LB |
210 | } |
211 | *irq = p->interrupts[0]; | |
212 | break; | |
1da177e4 | 213 | } |
50eca3eb | 214 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
4be44fcd | 215 | { |
50eca3eb | 216 | struct acpi_resource_extended_irq *p = |
4be44fcd | 217 | &resource->data.extended_irq; |
50eca3eb | 218 | if (!p || !p->interrupt_count) { |
4be44fcd LB |
219 | /* |
220 | * extended IRQ descriptors must | |
221 | * return at least 1 IRQ | |
222 | */ | |
cece9296 LB |
223 | printk(KERN_WARNING PREFIX |
224 | "Blank EXT IRQ resource\n"); | |
d550d98d | 225 | return AE_OK; |
4be44fcd LB |
226 | } |
227 | *irq = p->interrupts[0]; | |
228 | break; | |
1da177e4 | 229 | } |
d4ec6c7c | 230 | break; |
1da177e4 | 231 | default: |
6468463a | 232 | printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type); |
d4ec6c7c | 233 | case ACPI_RESOURCE_TYPE_END_TAG: |
d550d98d | 234 | return AE_OK; |
1da177e4 | 235 | } |
d550d98d | 236 | return AE_CTRL_TERMINATE; |
1da177e4 LT |
237 | } |
238 | ||
239 | /* | |
240 | * Run _CRS and set link->irq.active | |
241 | * | |
242 | * return value: | |
243 | * 0 - success | |
244 | * !0 - failure | |
245 | */ | |
4be44fcd | 246 | static int acpi_pci_link_get_current(struct acpi_pci_link *link) |
1da177e4 | 247 | { |
4be44fcd LB |
248 | int result = 0; |
249 | acpi_status status = AE_OK; | |
250 | int irq = 0; | |
1da177e4 | 251 | |
1da177e4 LT |
252 | |
253 | if (!link || !link->handle) | |
d550d98d | 254 | return -EINVAL; |
1da177e4 LT |
255 | |
256 | link->irq.active = 0; | |
257 | ||
258 | /* in practice, status disabled is meaningless, ignore it */ | |
259 | if (acpi_strict) { | |
260 | /* Query _STA, set link->device->status */ | |
261 | result = acpi_bus_get_status(link->device); | |
262 | if (result) { | |
6468463a | 263 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
264 | goto end; |
265 | } | |
266 | ||
267 | if (!link->device->status.enabled) { | |
268 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n")); | |
d550d98d | 269 | return 0; |
1da177e4 LT |
270 | } |
271 | } | |
272 | ||
273 | /* | |
274 | * Query and parse _CRS to get the current IRQ assignment. | |
275 | */ | |
276 | ||
277 | status = acpi_walk_resources(link->handle, METHOD_NAME__CRS, | |
4be44fcd | 278 | acpi_pci_link_check_current, &irq); |
1da177e4 | 279 | if (ACPI_FAILURE(status)) { |
a6fc6720 | 280 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS")); |
1da177e4 LT |
281 | result = -ENODEV; |
282 | goto end; | |
283 | } | |
284 | ||
285 | if (acpi_strict && !irq) { | |
6468463a | 286 | printk(KERN_ERR PREFIX "_CRS returned 0\n"); |
1da177e4 LT |
287 | result = -ENODEV; |
288 | } | |
289 | ||
290 | link->irq.active = irq; | |
291 | ||
292 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active)); | |
293 | ||
4be44fcd | 294 | end: |
d550d98d | 295 | return result; |
1da177e4 LT |
296 | } |
297 | ||
4be44fcd | 298 | static int acpi_pci_link_set(struct acpi_pci_link *link, int irq) |
1da177e4 | 299 | { |
4be44fcd LB |
300 | int result = 0; |
301 | acpi_status status = AE_OK; | |
1da177e4 | 302 | struct { |
4be44fcd LB |
303 | struct acpi_resource res; |
304 | struct acpi_resource end; | |
305 | } *resource; | |
306 | struct acpi_buffer buffer = { 0, NULL }; | |
1da177e4 | 307 | |
1da177e4 LT |
308 | |
309 | if (!link || !irq) | |
d550d98d | 310 | return -EINVAL; |
1da177e4 | 311 | |
a64882e7 | 312 | resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC); |
4be44fcd | 313 | if (!resource) |
d550d98d | 314 | return -ENOMEM; |
1da177e4 | 315 | |
4be44fcd LB |
316 | memset(resource, 0, sizeof(*resource) + 1); |
317 | buffer.length = sizeof(*resource) + 1; | |
1da177e4 LT |
318 | buffer.pointer = resource; |
319 | ||
4be44fcd | 320 | switch (link->irq.resource_type) { |
50eca3eb BM |
321 | case ACPI_RESOURCE_TYPE_IRQ: |
322 | resource->res.type = ACPI_RESOURCE_TYPE_IRQ; | |
1da177e4 | 323 | resource->res.length = sizeof(struct acpi_resource); |
50eca3eb BM |
324 | resource->res.data.irq.triggering = link->irq.triggering; |
325 | resource->res.data.irq.polarity = | |
326 | link->irq.polarity; | |
327 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
328 | resource->res.data.irq.sharable = | |
4be44fcd | 329 | ACPI_EXCLUSIVE; |
1da177e4 | 330 | else |
50eca3eb BM |
331 | resource->res.data.irq.sharable = ACPI_SHARED; |
332 | resource->res.data.irq.interrupt_count = 1; | |
1da177e4 LT |
333 | resource->res.data.irq.interrupts[0] = irq; |
334 | break; | |
4be44fcd | 335 | |
50eca3eb BM |
336 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
337 | resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ; | |
1da177e4 | 338 | resource->res.length = sizeof(struct acpi_resource); |
4be44fcd LB |
339 | resource->res.data.extended_irq.producer_consumer = |
340 | ACPI_CONSUMER; | |
50eca3eb BM |
341 | resource->res.data.extended_irq.triggering = |
342 | link->irq.triggering; | |
343 | resource->res.data.extended_irq.polarity = | |
344 | link->irq.polarity; | |
345 | if (link->irq.triggering == ACPI_EDGE_SENSITIVE) | |
346 | resource->res.data.irq.sharable = | |
4be44fcd | 347 | ACPI_EXCLUSIVE; |
1da177e4 | 348 | else |
50eca3eb BM |
349 | resource->res.data.irq.sharable = ACPI_SHARED; |
350 | resource->res.data.extended_irq.interrupt_count = 1; | |
1da177e4 LT |
351 | resource->res.data.extended_irq.interrupts[0] = irq; |
352 | /* ignore resource_source, it's optional */ | |
353 | break; | |
354 | default: | |
6468463a | 355 | printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type); |
1da177e4 LT |
356 | result = -EINVAL; |
357 | goto end; | |
358 | ||
359 | } | |
50eca3eb | 360 | resource->end.type = ACPI_RESOURCE_TYPE_END_TAG; |
1da177e4 LT |
361 | |
362 | /* Attempt to set the resource */ | |
363 | status = acpi_set_current_resources(link->handle, &buffer); | |
364 | ||
365 | /* check for total failure */ | |
366 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 367 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS")); |
1da177e4 LT |
368 | result = -ENODEV; |
369 | goto end; | |
370 | } | |
371 | ||
372 | /* Query _STA, set device->status */ | |
373 | result = acpi_bus_get_status(link->device); | |
374 | if (result) { | |
6468463a | 375 | printk(KERN_ERR PREFIX "Unable to read status\n"); |
1da177e4 LT |
376 | goto end; |
377 | } | |
378 | if (!link->device->status.enabled) { | |
cece9296 LB |
379 | printk(KERN_WARNING PREFIX |
380 | "%s [%s] disabled and referenced, BIOS bug\n", | |
a6fc6720 | 381 | acpi_device_name(link->device), |
cece9296 | 382 | acpi_device_bid(link->device)); |
1da177e4 LT |
383 | } |
384 | ||
385 | /* Query _CRS, set link->irq.active */ | |
386 | result = acpi_pci_link_get_current(link); | |
387 | if (result) { | |
388 | goto end; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Is current setting not what we set? | |
393 | * set link->irq.active | |
394 | */ | |
395 | if (link->irq.active != irq) { | |
396 | /* | |
397 | * policy: when _CRS doesn't return what we just _SRS | |
398 | * assume _SRS worked and override _CRS value. | |
399 | */ | |
cece9296 LB |
400 | printk(KERN_WARNING PREFIX |
401 | "%s [%s] BIOS reported IRQ %d, using IRQ %d\n", | |
a6fc6720 | 402 | acpi_device_name(link->device), |
cece9296 | 403 | acpi_device_bid(link->device), link->irq.active, irq); |
1da177e4 LT |
404 | link->irq.active = irq; |
405 | } | |
406 | ||
407 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active)); | |
4be44fcd LB |
408 | |
409 | end: | |
1da177e4 | 410 | kfree(resource); |
d550d98d | 411 | return result; |
1da177e4 LT |
412 | } |
413 | ||
1da177e4 LT |
414 | /* -------------------------------------------------------------------------- |
415 | PCI Link IRQ Management | |
416 | -------------------------------------------------------------------------- */ | |
417 | ||
418 | /* | |
419 | * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt | |
420 | * Link Devices to move the PIRQs around to minimize sharing. | |
421 | * | |
422 | * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs | |
423 | * that the BIOS has already set to active. This is necessary because | |
424 | * ACPI has no automatic means of knowing what ISA IRQs are used. Note that | |
425 | * if the BIOS doesn't set a Link Device active, ACPI needs to program it | |
426 | * even if acpi_irq_nobalance is set. | |
427 | * | |
428 | * A tables of penalties avoids directing PCI interrupts to well known | |
429 | * ISA IRQs. Boot params are available to over-ride the default table: | |
430 | * | |
431 | * List interrupts that are free for PCI use. | |
432 | * acpi_irq_pci=n[,m] | |
433 | * | |
434 | * List interrupts that should not be used for PCI: | |
435 | * acpi_irq_isa=n[,m] | |
436 | * | |
437 | * Note that PCI IRQ routers have a list of possible IRQs, | |
438 | * which may not include the IRQs this table says are available. | |
439 | * | |
440 | * Since this heuristic can't tell the difference between a link | |
441 | * that no device will attach to, vs. a link which may be shared | |
442 | * by multiple active devices -- it is not optimal. | |
443 | * | |
444 | * If interrupt performance is that important, get an IO-APIC system | |
445 | * with a pin dedicated to each device. Or for that matter, an MSI | |
446 | * enabled system. | |
447 | */ | |
448 | ||
449 | #define ACPI_MAX_IRQS 256 | |
450 | #define ACPI_MAX_ISA_IRQ 16 | |
451 | ||
452 | #define PIRQ_PENALTY_PCI_AVAILABLE (0) | |
453 | #define PIRQ_PENALTY_PCI_POSSIBLE (16*16) | |
454 | #define PIRQ_PENALTY_PCI_USING (16*16*16) | |
455 | #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16) | |
456 | #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16) | |
457 | #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16) | |
458 | ||
459 | static int acpi_irq_penalty[ACPI_MAX_IRQS] = { | |
460 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ0 timer */ | |
461 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ1 keyboard */ | |
462 | PIRQ_PENALTY_ISA_ALWAYS, /* IRQ2 cascade */ | |
4be44fcd LB |
463 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */ |
464 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */ | |
1da177e4 LT |
465 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ5 sometimes SoundBlaster */ |
466 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ6 */ | |
467 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ7 parallel, spurious */ | |
468 | PIRQ_PENALTY_ISA_TYPICAL, /* IRQ8 rtc, sometimes */ | |
469 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ9 PCI, often acpi */ | |
470 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ10 PCI */ | |
471 | PIRQ_PENALTY_PCI_AVAILABLE, /* IRQ11 PCI */ | |
472 | PIRQ_PENALTY_ISA_USED, /* IRQ12 mouse */ | |
473 | PIRQ_PENALTY_ISA_USED, /* IRQ13 fpe, sometimes */ | |
474 | PIRQ_PENALTY_ISA_USED, /* IRQ14 ide0 */ | |
475 | PIRQ_PENALTY_ISA_USED, /* IRQ15 ide1 */ | |
4be44fcd | 476 | /* >IRQ15 */ |
1da177e4 LT |
477 | }; |
478 | ||
4be44fcd | 479 | int __init acpi_irq_penalty_init(void) |
1da177e4 | 480 | { |
4be44fcd LB |
481 | struct list_head *node = NULL; |
482 | struct acpi_pci_link *link = NULL; | |
483 | int i = 0; | |
1da177e4 | 484 | |
1da177e4 LT |
485 | |
486 | /* | |
487 | * Update penalties to facilitate IRQ balancing. | |
488 | */ | |
489 | list_for_each(node, &acpi_link.entries) { | |
490 | ||
491 | link = list_entry(node, struct acpi_pci_link, node); | |
492 | if (!link) { | |
6468463a | 493 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
494 | continue; |
495 | } | |
496 | ||
497 | /* | |
498 | * reflect the possible and active irqs in the penalty table -- | |
499 | * useful for breaking ties. | |
500 | */ | |
501 | if (link->irq.possible_count) { | |
4be44fcd LB |
502 | int penalty = |
503 | PIRQ_PENALTY_PCI_POSSIBLE / | |
504 | link->irq.possible_count; | |
1da177e4 LT |
505 | |
506 | for (i = 0; i < link->irq.possible_count; i++) { | |
507 | if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ) | |
4be44fcd LB |
508 | acpi_irq_penalty[link->irq. |
509 | possible[i]] += | |
510 | penalty; | |
1da177e4 LT |
511 | } |
512 | ||
513 | } else if (link->irq.active) { | |
4be44fcd LB |
514 | acpi_irq_penalty[link->irq.active] += |
515 | PIRQ_PENALTY_PCI_POSSIBLE; | |
1da177e4 LT |
516 | } |
517 | } | |
518 | /* Add a penalty for the SCI */ | |
519 | acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING; | |
520 | ||
d550d98d | 521 | return 0; |
1da177e4 LT |
522 | } |
523 | ||
524 | static int acpi_irq_balance; /* 0: static, 1: balance */ | |
525 | ||
4be44fcd | 526 | static int acpi_pci_link_allocate(struct acpi_pci_link *link) |
1da177e4 | 527 | { |
4be44fcd LB |
528 | int irq; |
529 | int i; | |
1da177e4 | 530 | |
1da177e4 | 531 | |
87bec66b DSL |
532 | if (link->irq.initialized) { |
533 | if (link->refcnt == 0) | |
534 | /* This means the link is disabled but initialized */ | |
535 | acpi_pci_link_set(link, link->irq.active); | |
d550d98d | 536 | return 0; |
87bec66b | 537 | } |
1da177e4 LT |
538 | |
539 | /* | |
540 | * search for active IRQ in list of possible IRQs. | |
541 | */ | |
542 | for (i = 0; i < link->irq.possible_count; ++i) { | |
543 | if (link->irq.active == link->irq.possible[i]) | |
544 | break; | |
545 | } | |
546 | /* | |
547 | * forget active IRQ that is not in possible list | |
548 | */ | |
549 | if (i == link->irq.possible_count) { | |
550 | if (acpi_strict) | |
cece9296 LB |
551 | printk(KERN_WARNING PREFIX "_CRS %d not found" |
552 | " in _PRS\n", link->irq.active); | |
1da177e4 LT |
553 | link->irq.active = 0; |
554 | } | |
555 | ||
556 | /* | |
557 | * if active found, use it; else pick entry from end of possible list. | |
558 | */ | |
559 | if (link->irq.active) { | |
560 | irq = link->irq.active; | |
561 | } else { | |
562 | irq = link->irq.possible[link->irq.possible_count - 1]; | |
563 | } | |
564 | ||
565 | if (acpi_irq_balance || !link->irq.active) { | |
566 | /* | |
567 | * Select the best IRQ. This is done in reverse to promote | |
568 | * the use of IRQs 9, 10, 11, and >15. | |
569 | */ | |
570 | for (i = (link->irq.possible_count - 1); i >= 0; i--) { | |
4be44fcd LB |
571 | if (acpi_irq_penalty[irq] > |
572 | acpi_irq_penalty[link->irq.possible[i]]) | |
1da177e4 LT |
573 | irq = link->irq.possible[i]; |
574 | } | |
575 | } | |
576 | ||
577 | /* Attempt to enable the link device at this IRQ. */ | |
578 | if (acpi_pci_link_set(link, irq)) { | |
6468463a LB |
579 | printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. " |
580 | "Try pci=noacpi or acpi=off\n", | |
a6fc6720 | 581 | acpi_device_name(link->device), |
6468463a | 582 | acpi_device_bid(link->device)); |
d550d98d | 583 | return -ENODEV; |
1da177e4 LT |
584 | } else { |
585 | acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING; | |
4be44fcd LB |
586 | printk(PREFIX "%s [%s] enabled at IRQ %d\n", |
587 | acpi_device_name(link->device), | |
588 | acpi_device_bid(link->device), link->irq.active); | |
1da177e4 LT |
589 | } |
590 | ||
591 | link->irq.initialized = 1; | |
592 | ||
d550d98d | 593 | return 0; |
1da177e4 LT |
594 | } |
595 | ||
596 | /* | |
87bec66b | 597 | * acpi_pci_link_allocate_irq |
1da177e4 LT |
598 | * success: return IRQ >= 0 |
599 | * failure: return -1 | |
600 | */ | |
601 | ||
602 | int | |
4be44fcd LB |
603 | acpi_pci_link_allocate_irq(acpi_handle handle, |
604 | int index, | |
50eca3eb | 605 | int *triggering, int *polarity, char **name) |
1da177e4 | 606 | { |
4be44fcd LB |
607 | int result = 0; |
608 | struct acpi_device *device = NULL; | |
609 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 610 | |
1da177e4 LT |
611 | |
612 | result = acpi_bus_get_device(handle, &device); | |
613 | if (result) { | |
6468463a | 614 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 615 | return -1; |
1da177e4 LT |
616 | } |
617 | ||
4be44fcd | 618 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 619 | if (!link) { |
6468463a | 620 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 621 | return -1; |
1da177e4 LT |
622 | } |
623 | ||
624 | /* TBD: Support multiple index (IRQ) entries per Link Device */ | |
625 | if (index) { | |
6468463a | 626 | printk(KERN_ERR PREFIX "Invalid index %d\n", index); |
d550d98d | 627 | return -1; |
1da177e4 LT |
628 | } |
629 | ||
36e43095 | 630 | mutex_lock(&acpi_link_lock); |
87bec66b | 631 | if (acpi_pci_link_allocate(link)) { |
36e43095 | 632 | mutex_unlock(&acpi_link_lock); |
d550d98d | 633 | return -1; |
87bec66b | 634 | } |
4be44fcd | 635 | |
1da177e4 | 636 | if (!link->irq.active) { |
36e43095 | 637 | mutex_unlock(&acpi_link_lock); |
6468463a | 638 | printk(KERN_ERR PREFIX "Link active IRQ is 0!\n"); |
d550d98d | 639 | return -1; |
1da177e4 | 640 | } |
4be44fcd | 641 | link->refcnt++; |
36e43095 | 642 | mutex_unlock(&acpi_link_lock); |
1da177e4 | 643 | |
50eca3eb BM |
644 | if (triggering) |
645 | *triggering = link->irq.triggering; | |
646 | if (polarity) | |
647 | *polarity = link->irq.polarity; | |
4be44fcd LB |
648 | if (name) |
649 | *name = acpi_device_bid(link->device); | |
87bec66b | 650 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
651 | "Link %s is referenced\n", |
652 | acpi_device_bid(link->device))); | |
d550d98d | 653 | return (link->irq.active); |
1da177e4 LT |
654 | } |
655 | ||
87bec66b DSL |
656 | /* |
657 | * We don't change link's irq information here. After it is reenabled, we | |
658 | * continue use the info | |
659 | */ | |
4be44fcd | 660 | int acpi_pci_link_free_irq(acpi_handle handle) |
87bec66b | 661 | { |
4be44fcd LB |
662 | struct acpi_device *device = NULL; |
663 | struct acpi_pci_link *link = NULL; | |
664 | acpi_status result; | |
87bec66b | 665 | |
87bec66b DSL |
666 | |
667 | result = acpi_bus_get_device(handle, &device); | |
668 | if (result) { | |
6468463a | 669 | printk(KERN_ERR PREFIX "Invalid link device\n"); |
d550d98d | 670 | return -1; |
87bec66b | 671 | } |
1da177e4 | 672 | |
4be44fcd | 673 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
87bec66b | 674 | if (!link) { |
6468463a | 675 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
d550d98d | 676 | return -1; |
87bec66b DSL |
677 | } |
678 | ||
36e43095 | 679 | mutex_lock(&acpi_link_lock); |
87bec66b | 680 | if (!link->irq.initialized) { |
36e43095 | 681 | mutex_unlock(&acpi_link_lock); |
6468463a | 682 | printk(KERN_ERR PREFIX "Link isn't initialized\n"); |
d550d98d | 683 | return -1; |
87bec66b | 684 | } |
ecc21ebe DSL |
685 | #ifdef FUTURE_USE |
686 | /* | |
687 | * The Link reference count allows us to _DISable an unused link | |
688 | * and suspend time, and set it again on resume. | |
689 | * However, 2.6.12 still has irq_router.resume | |
690 | * which blindly restores the link state. | |
691 | * So we disable the reference count method | |
692 | * to prevent duplicate acpi_pci_link_set() | |
693 | * which would harm some systems | |
694 | */ | |
4be44fcd | 695 | link->refcnt--; |
ecc21ebe | 696 | #endif |
87bec66b | 697 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
4be44fcd LB |
698 | "Link %s is dereferenced\n", |
699 | acpi_device_bid(link->device))); | |
87bec66b DSL |
700 | |
701 | if (link->refcnt == 0) { | |
702 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
703 | } | |
36e43095 | 704 | mutex_unlock(&acpi_link_lock); |
d550d98d | 705 | return (link->irq.active); |
87bec66b | 706 | } |
4be44fcd | 707 | |
1da177e4 LT |
708 | /* -------------------------------------------------------------------------- |
709 | Driver Interface | |
710 | -------------------------------------------------------------------------- */ | |
711 | ||
4be44fcd | 712 | static int acpi_pci_link_add(struct acpi_device *device) |
1da177e4 | 713 | { |
4be44fcd LB |
714 | int result = 0; |
715 | struct acpi_pci_link *link = NULL; | |
716 | int i = 0; | |
717 | int found = 0; | |
1da177e4 | 718 | |
1da177e4 LT |
719 | |
720 | if (!device) | |
d550d98d | 721 | return -EINVAL; |
1da177e4 LT |
722 | |
723 | link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL); | |
724 | if (!link) | |
d550d98d | 725 | return -ENOMEM; |
1da177e4 LT |
726 | memset(link, 0, sizeof(struct acpi_pci_link)); |
727 | ||
728 | link->device = device; | |
729 | link->handle = device->handle; | |
730 | strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME); | |
731 | strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS); | |
732 | acpi_driver_data(device) = link; | |
733 | ||
36e43095 | 734 | mutex_lock(&acpi_link_lock); |
1da177e4 LT |
735 | result = acpi_pci_link_get_possible(link); |
736 | if (result) | |
737 | goto end; | |
738 | ||
739 | /* query and set link->irq.active */ | |
740 | acpi_pci_link_get_current(link); | |
741 | ||
742 | printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device), | |
4be44fcd | 743 | acpi_device_bid(device)); |
1da177e4 LT |
744 | for (i = 0; i < link->irq.possible_count; i++) { |
745 | if (link->irq.active == link->irq.possible[i]) { | |
746 | printk(" *%d", link->irq.possible[i]); | |
747 | found = 1; | |
4be44fcd | 748 | } else |
1da177e4 LT |
749 | printk(" %d", link->irq.possible[i]); |
750 | } | |
751 | ||
752 | printk(")"); | |
753 | ||
754 | if (!found) | |
755 | printk(" *%d", link->irq.active); | |
756 | ||
4be44fcd | 757 | if (!link->device->status.enabled) |
1da177e4 LT |
758 | printk(", disabled."); |
759 | ||
760 | printk("\n"); | |
761 | ||
762 | /* TBD: Acquire/release lock */ | |
763 | list_add_tail(&link->node, &acpi_link.entries); | |
764 | acpi_link.count++; | |
765 | ||
4be44fcd | 766 | end: |
1da177e4 LT |
767 | /* disable all links -- to be activated on use */ |
768 | acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL); | |
36e43095 | 769 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
770 | |
771 | if (result) | |
772 | kfree(link); | |
773 | ||
d550d98d | 774 | return result; |
1da177e4 LT |
775 | } |
776 | ||
4be44fcd | 777 | static int acpi_pci_link_resume(struct acpi_pci_link *link) |
697a2d63 | 778 | { |
697a2d63 LT |
779 | |
780 | if (link->refcnt && link->irq.active && link->irq.initialized) | |
d550d98d | 781 | return (acpi_pci_link_set(link, link->irq.active)); |
697a2d63 | 782 | else |
d550d98d | 783 | return 0; |
697a2d63 LT |
784 | } |
785 | ||
11e981f1 DSL |
786 | /* |
787 | * FIXME: this is a workaround to avoid nasty warning. It will be removed | |
788 | * after every device calls pci_disable_device in .resume. | |
789 | */ | |
790 | int acpi_in_resume; | |
4be44fcd | 791 | static int irqrouter_resume(struct sys_device *dev) |
1da177e4 | 792 | { |
4be44fcd LB |
793 | struct list_head *node = NULL; |
794 | struct acpi_pci_link *link = NULL; | |
1da177e4 | 795 | |
1da177e4 | 796 | |
56035091 LT |
797 | /* Make sure SCI is enabled again (Apple firmware bug?) */ |
798 | acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK); | |
799 | ||
11e981f1 | 800 | acpi_in_resume = 1; |
1da177e4 | 801 | list_for_each(node, &acpi_link.entries) { |
1da177e4 LT |
802 | link = list_entry(node, struct acpi_pci_link, node); |
803 | if (!link) { | |
6468463a | 804 | printk(KERN_ERR PREFIX "Invalid link context\n"); |
1da177e4 LT |
805 | continue; |
806 | } | |
697a2d63 | 807 | acpi_pci_link_resume(link); |
1da177e4 | 808 | } |
11e981f1 | 809 | acpi_in_resume = 0; |
d550d98d | 810 | return 0; |
1da177e4 LT |
811 | } |
812 | ||
4be44fcd | 813 | static int acpi_pci_link_remove(struct acpi_device *device, int type) |
1da177e4 LT |
814 | { |
815 | struct acpi_pci_link *link = NULL; | |
816 | ||
1da177e4 LT |
817 | |
818 | if (!device || !acpi_driver_data(device)) | |
d550d98d | 819 | return -EINVAL; |
1da177e4 | 820 | |
4be44fcd | 821 | link = (struct acpi_pci_link *)acpi_driver_data(device); |
1da177e4 | 822 | |
36e43095 | 823 | mutex_lock(&acpi_link_lock); |
1da177e4 | 824 | list_del(&link->node); |
36e43095 | 825 | mutex_unlock(&acpi_link_lock); |
1da177e4 LT |
826 | |
827 | kfree(link); | |
828 | ||
d550d98d | 829 | return 0; |
1da177e4 LT |
830 | } |
831 | ||
832 | /* | |
833 | * modify acpi_irq_penalty[] from cmdline | |
834 | */ | |
835 | static int __init acpi_irq_penalty_update(char *str, int used) | |
836 | { | |
837 | int i; | |
838 | ||
839 | for (i = 0; i < 16; i++) { | |
840 | int retval; | |
841 | int irq; | |
842 | ||
4be44fcd | 843 | retval = get_option(&str, &irq); |
1da177e4 LT |
844 | |
845 | if (!retval) | |
846 | break; /* no number found */ | |
847 | ||
848 | if (irq < 0) | |
849 | continue; | |
4be44fcd | 850 | |
1da177e4 LT |
851 | if (irq >= ACPI_MAX_IRQS) |
852 | continue; | |
853 | ||
854 | if (used) | |
855 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
856 | else | |
857 | acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE; | |
858 | ||
859 | if (retval != 2) /* no next number */ | |
860 | break; | |
861 | } | |
862 | return 1; | |
863 | } | |
864 | ||
865 | /* | |
866 | * We'd like PNP to call this routine for the | |
867 | * single ISA_USED value for each legacy device. | |
868 | * But instead it calls us with each POSSIBLE setting. | |
869 | * There is no ISA_POSSIBLE weight, so we simply use | |
870 | * the (small) PCI_USING penalty. | |
871 | */ | |
c9c3e457 | 872 | void acpi_penalize_isa_irq(int irq, int active) |
1da177e4 | 873 | { |
c9c3e457 DSL |
874 | if (active) |
875 | acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED; | |
876 | else | |
877 | acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING; | |
1da177e4 LT |
878 | } |
879 | ||
880 | /* | |
881 | * Over-ride default table to reserve additional IRQs for use by ISA | |
882 | * e.g. acpi_irq_isa=5 | |
883 | * Useful for telling ACPI how not to interfere with your ISA sound card. | |
884 | */ | |
885 | static int __init acpi_irq_isa(char *str) | |
886 | { | |
887 | return acpi_irq_penalty_update(str, 1); | |
888 | } | |
4be44fcd | 889 | |
1da177e4 LT |
890 | __setup("acpi_irq_isa=", acpi_irq_isa); |
891 | ||
892 | /* | |
893 | * Over-ride default table to free additional IRQs for use by PCI | |
894 | * e.g. acpi_irq_pci=7,15 | |
895 | * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing. | |
896 | */ | |
897 | static int __init acpi_irq_pci(char *str) | |
898 | { | |
899 | return acpi_irq_penalty_update(str, 0); | |
900 | } | |
4be44fcd | 901 | |
1da177e4 LT |
902 | __setup("acpi_irq_pci=", acpi_irq_pci); |
903 | ||
904 | static int __init acpi_irq_nobalance_set(char *str) | |
905 | { | |
906 | acpi_irq_balance = 0; | |
907 | return 1; | |
908 | } | |
4be44fcd | 909 | |
1da177e4 LT |
910 | __setup("acpi_irq_nobalance", acpi_irq_nobalance_set); |
911 | ||
912 | int __init acpi_irq_balance_set(char *str) | |
913 | { | |
914 | acpi_irq_balance = 1; | |
915 | return 1; | |
916 | } | |
1da177e4 | 917 | |
4be44fcd | 918 | __setup("acpi_irq_balance", acpi_irq_balance_set); |
1da177e4 | 919 | |
87bec66b | 920 | /* FIXME: we will remove this interface after all drivers call pci_disable_device */ |
1da177e4 | 921 | static struct sysdev_class irqrouter_sysdev_class = { |
4be44fcd LB |
922 | set_kset_name("irqrouter"), |
923 | .resume = irqrouter_resume, | |
1da177e4 LT |
924 | }; |
925 | ||
1da177e4 | 926 | static struct sys_device device_irqrouter = { |
4be44fcd LB |
927 | .id = 0, |
928 | .cls = &irqrouter_sysdev_class, | |
1da177e4 LT |
929 | }; |
930 | ||
1da177e4 LT |
931 | static int __init irqrouter_init_sysfs(void) |
932 | { | |
933 | int error; | |
934 | ||
1da177e4 LT |
935 | |
936 | if (acpi_disabled || acpi_noirq) | |
d550d98d | 937 | return 0; |
1da177e4 LT |
938 | |
939 | error = sysdev_class_register(&irqrouter_sysdev_class); | |
940 | if (!error) | |
941 | error = sysdev_register(&device_irqrouter); | |
942 | ||
d550d98d | 943 | return error; |
4be44fcd | 944 | } |
1da177e4 LT |
945 | |
946 | device_initcall(irqrouter_init_sysfs); | |
947 | ||
4be44fcd | 948 | static int __init acpi_pci_link_init(void) |
1da177e4 | 949 | { |
1da177e4 LT |
950 | |
951 | if (acpi_noirq) | |
d550d98d | 952 | return 0; |
1da177e4 LT |
953 | |
954 | acpi_link.count = 0; | |
955 | INIT_LIST_HEAD(&acpi_link.entries); | |
956 | ||
957 | if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0) | |
d550d98d | 958 | return -ENODEV; |
1da177e4 | 959 | |
d550d98d | 960 | return 0; |
1da177e4 LT |
961 | } |
962 | ||
963 | subsys_initcall(acpi_pci_link_init); |