2 * pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
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>
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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).
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>
40 #include <linux/pci.h>
41 #include <linux/mutex.h>
43 #include <acpi/acpi_bus.h>
44 #include <acpi/acpi_drivers.h>
46 #define _COMPONENT ACPI_PCI_COMPONENT
47 ACPI_MODULE_NAME("pci_link")
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"
54 #define ACPI_PCI_LINK_MAX_POSSIBLE 16
55 static int acpi_pci_link_add(struct acpi_device *device);
56 static int acpi_pci_link_remove(struct acpi_device *device, int type);
58 static struct acpi_driver acpi_pci_link_driver = {
59 .name = ACPI_PCI_LINK_DRIVER_NAME,
60 .class = ACPI_PCI_LINK_CLASS,
61 .ids = ACPI_PCI_LINK_HID,
63 .add = acpi_pci_link_add,
64 .remove = acpi_pci_link_remove,
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
72 struct acpi_pci_link_irq {
73 u8 active; /* Current IRQ */
74 u8 triggering; /* All IRQs */
75 u8 polarity; /* All IRQs */
78 u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
83 struct acpi_pci_link {
84 struct list_head node;
85 struct acpi_device *device;
87 struct acpi_pci_link_irq irq;
93 struct list_head entries;
95 DEFINE_MUTEX(acpi_link_lock);
97 /* --------------------------------------------------------------------------
98 PCI Link Device Management
99 -------------------------------------------------------------------------- */
102 * set context (link) possible list from resource list
105 acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
107 struct acpi_pci_link *link = (struct acpi_pci_link *)context;
111 switch (resource->type) {
112 case ACPI_RESOURCE_TYPE_START_DEPENDENT:
114 case ACPI_RESOURCE_TYPE_IRQ:
116 struct acpi_resource_irq *p = &resource->data.irq;
117 if (!p || !p->interrupt_count) {
118 printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
122 (i < p->interrupt_count
123 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
124 if (!p->interrupts[i]) {
125 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
129 link->irq.possible[i] = p->interrupts[i];
130 link->irq.possible_count++;
132 link->irq.triggering = p->triggering;
133 link->irq.polarity = p->polarity;
134 link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
137 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
139 struct acpi_resource_extended_irq *p =
140 &resource->data.extended_irq;
141 if (!p || !p->interrupt_count) {
142 printk(KERN_WARNING PREFIX
143 "Blank EXT IRQ resource\n");
147 (i < p->interrupt_count
148 && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
149 if (!p->interrupts[i]) {
150 printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
154 link->irq.possible[i] = p->interrupts[i];
155 link->irq.possible_count++;
157 link->irq.triggering = p->triggering;
158 link->irq.polarity = p->polarity;
159 link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
163 printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
167 return AE_CTRL_TERMINATE;
170 static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
178 status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
179 acpi_pci_link_check_possible, link);
180 if (ACPI_FAILURE(status)) {
181 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
185 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
186 "Found %d possible IRQs\n",
187 link->irq.possible_count));
193 acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
195 int *irq = (int *)context;
198 switch (resource->type) {
199 case ACPI_RESOURCE_TYPE_IRQ:
201 struct acpi_resource_irq *p = &resource->data.irq;
202 if (!p || !p->interrupt_count) {
204 * IRQ descriptors may have no IRQ# bits set,
205 * particularly those those w/ _STA disabled
207 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
208 "Blank IRQ resource\n"));
211 *irq = p->interrupts[0];
214 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
216 struct acpi_resource_extended_irq *p =
217 &resource->data.extended_irq;
218 if (!p || !p->interrupt_count) {
220 * extended IRQ descriptors must
221 * return at least 1 IRQ
223 printk(KERN_WARNING PREFIX
224 "Blank EXT IRQ resource\n");
227 *irq = p->interrupts[0];
232 printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type);
233 case ACPI_RESOURCE_TYPE_END_TAG:
236 return AE_CTRL_TERMINATE;
240 * Run _CRS and set link->irq.active
246 static int acpi_pci_link_get_current(struct acpi_pci_link *link)
249 acpi_status status = AE_OK;
253 if (!link || !link->handle)
256 link->irq.active = 0;
258 /* in practice, status disabled is meaningless, ignore it */
260 /* Query _STA, set link->device->status */
261 result = acpi_bus_get_status(link->device);
263 printk(KERN_ERR PREFIX "Unable to read status\n");
267 if (!link->device->status.enabled) {
268 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
274 * Query and parse _CRS to get the current IRQ assignment.
277 status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
278 acpi_pci_link_check_current, &irq);
279 if (ACPI_FAILURE(status)) {
280 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
285 if (acpi_strict && !irq) {
286 printk(KERN_ERR PREFIX "_CRS returned 0\n");
290 link->irq.active = irq;
292 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));
298 static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
301 acpi_status status = AE_OK;
303 struct acpi_resource res;
304 struct acpi_resource end;
306 struct acpi_buffer buffer = { 0, NULL };
312 resource = kmalloc(sizeof(*resource) + 1, GFP_ATOMIC);
316 memset(resource, 0, sizeof(*resource) + 1);
317 buffer.length = sizeof(*resource) + 1;
318 buffer.pointer = resource;
320 switch (link->irq.resource_type) {
321 case ACPI_RESOURCE_TYPE_IRQ:
322 resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
323 resource->res.length = sizeof(struct acpi_resource);
324 resource->res.data.irq.triggering = link->irq.triggering;
325 resource->res.data.irq.polarity =
327 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
328 resource->res.data.irq.sharable =
331 resource->res.data.irq.sharable = ACPI_SHARED;
332 resource->res.data.irq.interrupt_count = 1;
333 resource->res.data.irq.interrupts[0] = irq;
336 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
337 resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
338 resource->res.length = sizeof(struct acpi_resource);
339 resource->res.data.extended_irq.producer_consumer =
341 resource->res.data.extended_irq.triggering =
342 link->irq.triggering;
343 resource->res.data.extended_irq.polarity =
345 if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
346 resource->res.data.irq.sharable =
349 resource->res.data.irq.sharable = ACPI_SHARED;
350 resource->res.data.extended_irq.interrupt_count = 1;
351 resource->res.data.extended_irq.interrupts[0] = irq;
352 /* ignore resource_source, it's optional */
355 printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
360 resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;
362 /* Attempt to set the resource */
363 status = acpi_set_current_resources(link->handle, &buffer);
365 /* check for total failure */
366 if (ACPI_FAILURE(status)) {
367 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
372 /* Query _STA, set device->status */
373 result = acpi_bus_get_status(link->device);
375 printk(KERN_ERR PREFIX "Unable to read status\n");
378 if (!link->device->status.enabled) {
379 printk(KERN_WARNING PREFIX
380 "%s [%s] disabled and referenced, BIOS bug\n",
381 acpi_device_name(link->device),
382 acpi_device_bid(link->device));
385 /* Query _CRS, set link->irq.active */
386 result = acpi_pci_link_get_current(link);
392 * Is current setting not what we set?
393 * set link->irq.active
395 if (link->irq.active != irq) {
397 * policy: when _CRS doesn't return what we just _SRS
398 * assume _SRS worked and override _CRS value.
400 printk(KERN_WARNING PREFIX
401 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
402 acpi_device_name(link->device),
403 acpi_device_bid(link->device), link->irq.active, irq);
404 link->irq.active = irq;
407 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
414 /* --------------------------------------------------------------------------
415 PCI Link IRQ Management
416 -------------------------------------------------------------------------- */
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.
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.
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:
431 * List interrupts that are free for PCI use.
434 * List interrupts that should not be used for PCI:
437 * Note that PCI IRQ routers have a list of possible IRQs,
438 * which may not include the IRQs this table says are available.
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.
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
449 #define ACPI_MAX_IRQS 256
450 #define ACPI_MAX_ISA_IRQ 16
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)
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 */
463 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ3 serial */
464 PIRQ_PENALTY_ISA_TYPICAL, /* IRQ4 serial */
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 */
479 int __init acpi_irq_penalty_init(void)
481 struct list_head *node = NULL;
482 struct acpi_pci_link *link = NULL;
487 * Update penalties to facilitate IRQ balancing.
489 list_for_each(node, &acpi_link.entries) {
491 link = list_entry(node, struct acpi_pci_link, node);
493 printk(KERN_ERR PREFIX "Invalid link context\n");
498 * reflect the possible and active irqs in the penalty table --
499 * useful for breaking ties.
501 if (link->irq.possible_count) {
503 PIRQ_PENALTY_PCI_POSSIBLE /
504 link->irq.possible_count;
506 for (i = 0; i < link->irq.possible_count; i++) {
507 if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
508 acpi_irq_penalty[link->irq.
513 } else if (link->irq.active) {
514 acpi_irq_penalty[link->irq.active] +=
515 PIRQ_PENALTY_PCI_POSSIBLE;
518 /* Add a penalty for the SCI */
519 acpi_irq_penalty[acpi_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
524 static int acpi_irq_balance; /* 0: static, 1: balance */
526 static int acpi_pci_link_allocate(struct acpi_pci_link *link)
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);
540 * search for active IRQ in list of possible IRQs.
542 for (i = 0; i < link->irq.possible_count; ++i) {
543 if (link->irq.active == link->irq.possible[i])
547 * forget active IRQ that is not in possible list
549 if (i == link->irq.possible_count) {
551 printk(KERN_WARNING PREFIX "_CRS %d not found"
552 " in _PRS\n", link->irq.active);
553 link->irq.active = 0;
557 * if active found, use it; else pick entry from end of possible list.
559 if (link->irq.active) {
560 irq = link->irq.active;
562 irq = link->irq.possible[link->irq.possible_count - 1];
565 if (acpi_irq_balance || !link->irq.active) {
567 * Select the best IRQ. This is done in reverse to promote
568 * the use of IRQs 9, 10, 11, and >15.
570 for (i = (link->irq.possible_count - 1); i >= 0; i--) {
571 if (acpi_irq_penalty[irq] >
572 acpi_irq_penalty[link->irq.possible[i]])
573 irq = link->irq.possible[i];
577 /* Attempt to enable the link device at this IRQ. */
578 if (acpi_pci_link_set(link, irq)) {
579 printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
580 "Try pci=noacpi or acpi=off\n",
581 acpi_device_name(link->device),
582 acpi_device_bid(link->device));
585 acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
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);
591 link->irq.initialized = 1;
597 * acpi_pci_link_allocate_irq
598 * success: return IRQ >= 0
603 acpi_pci_link_allocate_irq(acpi_handle handle,
605 int *triggering, int *polarity, char **name)
608 struct acpi_device *device = NULL;
609 struct acpi_pci_link *link = NULL;
612 result = acpi_bus_get_device(handle, &device);
614 printk(KERN_ERR PREFIX "Invalid link device\n");
618 link = (struct acpi_pci_link *)acpi_driver_data(device);
620 printk(KERN_ERR PREFIX "Invalid link context\n");
624 /* TBD: Support multiple index (IRQ) entries per Link Device */
626 printk(KERN_ERR PREFIX "Invalid index %d\n", index);
630 mutex_lock(&acpi_link_lock);
631 if (acpi_pci_link_allocate(link)) {
632 mutex_unlock(&acpi_link_lock);
636 if (!link->irq.active) {
637 mutex_unlock(&acpi_link_lock);
638 printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
642 mutex_unlock(&acpi_link_lock);
645 *triggering = link->irq.triggering;
647 *polarity = link->irq.polarity;
649 *name = acpi_device_bid(link->device);
650 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
651 "Link %s is referenced\n",
652 acpi_device_bid(link->device)));
653 return (link->irq.active);
657 * We don't change link's irq information here. After it is reenabled, we
658 * continue use the info
660 int acpi_pci_link_free_irq(acpi_handle handle)
662 struct acpi_device *device = NULL;
663 struct acpi_pci_link *link = NULL;
667 result = acpi_bus_get_device(handle, &device);
669 printk(KERN_ERR PREFIX "Invalid link device\n");
673 link = (struct acpi_pci_link *)acpi_driver_data(device);
675 printk(KERN_ERR PREFIX "Invalid link context\n");
679 mutex_lock(&acpi_link_lock);
680 if (!link->irq.initialized) {
681 mutex_unlock(&acpi_link_lock);
682 printk(KERN_ERR PREFIX "Link isn't initialized\n");
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
697 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
698 "Link %s is dereferenced\n",
699 acpi_device_bid(link->device)));
701 if (link->refcnt == 0) {
702 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
704 mutex_unlock(&acpi_link_lock);
705 return (link->irq.active);
708 /* --------------------------------------------------------------------------
710 -------------------------------------------------------------------------- */
712 static int acpi_pci_link_add(struct acpi_device *device)
715 struct acpi_pci_link *link = NULL;
723 link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
726 memset(link, 0, sizeof(struct acpi_pci_link));
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;
734 mutex_lock(&acpi_link_lock);
735 result = acpi_pci_link_get_possible(link);
739 /* query and set link->irq.active */
740 acpi_pci_link_get_current(link);
742 printk(PREFIX "%s [%s] (IRQs", acpi_device_name(device),
743 acpi_device_bid(device));
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]);
749 printk(" %d", link->irq.possible[i]);
755 printk(" *%d", link->irq.active);
757 if (!link->device->status.enabled)
758 printk(", disabled.");
762 /* TBD: Acquire/release lock */
763 list_add_tail(&link->node, &acpi_link.entries);
767 /* disable all links -- to be activated on use */
768 acpi_ut_evaluate_object(link->handle, "_DIS", 0, NULL);
769 mutex_unlock(&acpi_link_lock);
777 static int acpi_pci_link_resume(struct acpi_pci_link *link)
780 if (link->refcnt && link->irq.active && link->irq.initialized)
781 return (acpi_pci_link_set(link, link->irq.active));
787 * FIXME: this is a workaround to avoid nasty warning. It will be removed
788 * after every device calls pci_disable_device in .resume.
791 static int irqrouter_resume(struct sys_device *dev)
793 struct list_head *node = NULL;
794 struct acpi_pci_link *link = NULL;
797 /* Make sure SCI is enabled again (Apple firmware bug?) */
798 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1, ACPI_MTX_DO_NOT_LOCK);
801 list_for_each(node, &acpi_link.entries) {
802 link = list_entry(node, struct acpi_pci_link, node);
804 printk(KERN_ERR PREFIX "Invalid link context\n");
807 acpi_pci_link_resume(link);
813 static int acpi_pci_link_remove(struct acpi_device *device, int type)
815 struct acpi_pci_link *link = NULL;
818 if (!device || !acpi_driver_data(device))
821 link = (struct acpi_pci_link *)acpi_driver_data(device);
823 mutex_lock(&acpi_link_lock);
824 list_del(&link->node);
825 mutex_unlock(&acpi_link_lock);
833 * modify acpi_irq_penalty[] from cmdline
835 static int __init acpi_irq_penalty_update(char *str, int used)
839 for (i = 0; i < 16; i++) {
843 retval = get_option(&str, &irq);
846 break; /* no number found */
851 if (irq >= ACPI_MAX_IRQS)
855 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
857 acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;
859 if (retval != 2) /* no next number */
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.
872 void acpi_penalize_isa_irq(int irq, int active)
875 acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
877 acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
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.
885 static int __init acpi_irq_isa(char *str)
887 return acpi_irq_penalty_update(str, 1);
890 __setup("acpi_irq_isa=", acpi_irq_isa);
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.
897 static int __init acpi_irq_pci(char *str)
899 return acpi_irq_penalty_update(str, 0);
902 __setup("acpi_irq_pci=", acpi_irq_pci);
904 static int __init acpi_irq_nobalance_set(char *str)
906 acpi_irq_balance = 0;
910 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set);
912 int __init acpi_irq_balance_set(char *str)
914 acpi_irq_balance = 1;
918 __setup("acpi_irq_balance", acpi_irq_balance_set);
920 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
921 static struct sysdev_class irqrouter_sysdev_class = {
922 set_kset_name("irqrouter"),
923 .resume = irqrouter_resume,
926 static struct sys_device device_irqrouter = {
928 .cls = &irqrouter_sysdev_class,
931 static int __init irqrouter_init_sysfs(void)
936 if (acpi_disabled || acpi_noirq)
939 error = sysdev_class_register(&irqrouter_sysdev_class);
941 error = sysdev_register(&device_irqrouter);
946 device_initcall(irqrouter_init_sysfs);
948 static int __init acpi_pci_link_init(void)
955 INIT_LIST_HEAD(&acpi_link.entries);
957 if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
963 subsys_initcall(acpi_pci_link_init);