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
;
86 struct acpi_pci_link_irq irq
;
92 struct list_head entries
;
94 DEFINE_MUTEX(acpi_link_lock
);
96 /* --------------------------------------------------------------------------
97 PCI Link Device Management
98 -------------------------------------------------------------------------- */
101 * set context (link) possible list from resource list
104 acpi_pci_link_check_possible(struct acpi_resource
*resource
, void *context
)
106 struct acpi_pci_link
*link
= context
;
110 switch (resource
->type
) {
111 case ACPI_RESOURCE_TYPE_START_DEPENDENT
:
113 case ACPI_RESOURCE_TYPE_IRQ
:
115 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
116 if (!p
|| !p
->interrupt_count
) {
117 printk(KERN_WARNING PREFIX
"Blank IRQ resource\n");
121 (i
< p
->interrupt_count
122 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
123 if (!p
->interrupts
[i
]) {
124 printk(KERN_WARNING PREFIX
"Invalid IRQ %d\n",
128 link
->irq
.possible
[i
] = p
->interrupts
[i
];
129 link
->irq
.possible_count
++;
131 link
->irq
.triggering
= p
->triggering
;
132 link
->irq
.polarity
= p
->polarity
;
133 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_IRQ
;
136 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
138 struct acpi_resource_extended_irq
*p
=
139 &resource
->data
.extended_irq
;
140 if (!p
|| !p
->interrupt_count
) {
141 printk(KERN_WARNING PREFIX
142 "Blank EXT IRQ resource\n");
146 (i
< p
->interrupt_count
147 && i
< ACPI_PCI_LINK_MAX_POSSIBLE
); i
++) {
148 if (!p
->interrupts
[i
]) {
149 printk(KERN_WARNING PREFIX
"Invalid IRQ %d\n",
153 link
->irq
.possible
[i
] = p
->interrupts
[i
];
154 link
->irq
.possible_count
++;
156 link
->irq
.triggering
= p
->triggering
;
157 link
->irq
.polarity
= p
->polarity
;
158 link
->irq
.resource_type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
162 printk(KERN_ERR PREFIX
"Resource is not an IRQ entry\n");
166 return AE_CTRL_TERMINATE
;
169 static int acpi_pci_link_get_possible(struct acpi_pci_link
*link
)
177 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__PRS
,
178 acpi_pci_link_check_possible
, link
);
179 if (ACPI_FAILURE(status
)) {
180 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _PRS"));
184 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
185 "Found %d possible IRQs\n",
186 link
->irq
.possible_count
));
192 acpi_pci_link_check_current(struct acpi_resource
*resource
, void *context
)
194 int *irq
= (int *)context
;
197 switch (resource
->type
) {
198 case ACPI_RESOURCE_TYPE_IRQ
:
200 struct acpi_resource_irq
*p
= &resource
->data
.irq
;
201 if (!p
|| !p
->interrupt_count
) {
203 * IRQ descriptors may have no IRQ# bits set,
204 * particularly those those w/ _STA disabled
206 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
207 "Blank IRQ resource\n"));
210 *irq
= p
->interrupts
[0];
213 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
215 struct acpi_resource_extended_irq
*p
=
216 &resource
->data
.extended_irq
;
217 if (!p
|| !p
->interrupt_count
) {
219 * extended IRQ descriptors must
220 * return at least 1 IRQ
222 printk(KERN_WARNING PREFIX
223 "Blank EXT IRQ resource\n");
226 *irq
= p
->interrupts
[0];
231 printk(KERN_ERR PREFIX
"Resource %d isn't an IRQ\n", resource
->type
);
232 case ACPI_RESOURCE_TYPE_END_TAG
:
235 return AE_CTRL_TERMINATE
;
239 * Run _CRS and set link->irq.active
245 static int acpi_pci_link_get_current(struct acpi_pci_link
*link
)
248 acpi_status status
= AE_OK
;
254 link
->irq
.active
= 0;
256 /* in practice, status disabled is meaningless, ignore it */
258 /* Query _STA, set link->device->status */
259 result
= acpi_bus_get_status(link
->device
);
261 printk(KERN_ERR PREFIX
"Unable to read status\n");
265 if (!link
->device
->status
.enabled
) {
266 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link disabled\n"));
272 * Query and parse _CRS to get the current IRQ assignment.
275 status
= acpi_walk_resources(link
->device
->handle
, METHOD_NAME__CRS
,
276 acpi_pci_link_check_current
, &irq
);
277 if (ACPI_FAILURE(status
)) {
278 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _CRS"));
283 if (acpi_strict
&& !irq
) {
284 printk(KERN_ERR PREFIX
"_CRS returned 0\n");
288 link
->irq
.active
= irq
;
290 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Link at IRQ %d \n", link
->irq
.active
));
296 static int acpi_pci_link_set(struct acpi_pci_link
*link
, int irq
)
299 acpi_status status
= AE_OK
;
301 struct acpi_resource res
;
302 struct acpi_resource end
;
304 struct acpi_buffer buffer
= { 0, NULL
};
310 resource
= kzalloc(sizeof(*resource
) + 1, irqs_disabled() ? GFP_ATOMIC
: GFP_KERNEL
);
314 buffer
.length
= sizeof(*resource
) + 1;
315 buffer
.pointer
= resource
;
317 switch (link
->irq
.resource_type
) {
318 case ACPI_RESOURCE_TYPE_IRQ
:
319 resource
->res
.type
= ACPI_RESOURCE_TYPE_IRQ
;
320 resource
->res
.length
= sizeof(struct acpi_resource
);
321 resource
->res
.data
.irq
.triggering
= link
->irq
.triggering
;
322 resource
->res
.data
.irq
.polarity
=
324 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
325 resource
->res
.data
.irq
.sharable
=
328 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
329 resource
->res
.data
.irq
.interrupt_count
= 1;
330 resource
->res
.data
.irq
.interrupts
[0] = irq
;
333 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
334 resource
->res
.type
= ACPI_RESOURCE_TYPE_EXTENDED_IRQ
;
335 resource
->res
.length
= sizeof(struct acpi_resource
);
336 resource
->res
.data
.extended_irq
.producer_consumer
=
338 resource
->res
.data
.extended_irq
.triggering
=
339 link
->irq
.triggering
;
340 resource
->res
.data
.extended_irq
.polarity
=
342 if (link
->irq
.triggering
== ACPI_EDGE_SENSITIVE
)
343 resource
->res
.data
.irq
.sharable
=
346 resource
->res
.data
.irq
.sharable
= ACPI_SHARED
;
347 resource
->res
.data
.extended_irq
.interrupt_count
= 1;
348 resource
->res
.data
.extended_irq
.interrupts
[0] = irq
;
349 /* ignore resource_source, it's optional */
352 printk(KERN_ERR PREFIX
"Invalid Resource_type %d\n", link
->irq
.resource_type
);
357 resource
->end
.type
= ACPI_RESOURCE_TYPE_END_TAG
;
359 /* Attempt to set the resource */
360 status
= acpi_set_current_resources(link
->device
->handle
, &buffer
);
362 /* check for total failure */
363 if (ACPI_FAILURE(status
)) {
364 ACPI_EXCEPTION((AE_INFO
, status
, "Evaluating _SRS"));
369 /* Query _STA, set device->status */
370 result
= acpi_bus_get_status(link
->device
);
372 printk(KERN_ERR PREFIX
"Unable to read status\n");
375 if (!link
->device
->status
.enabled
) {
376 printk(KERN_WARNING PREFIX
377 "%s [%s] disabled and referenced, BIOS bug\n",
378 acpi_device_name(link
->device
),
379 acpi_device_bid(link
->device
));
382 /* Query _CRS, set link->irq.active */
383 result
= acpi_pci_link_get_current(link
);
389 * Is current setting not what we set?
390 * set link->irq.active
392 if (link
->irq
.active
!= irq
) {
394 * policy: when _CRS doesn't return what we just _SRS
395 * assume _SRS worked and override _CRS value.
397 printk(KERN_WARNING PREFIX
398 "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
399 acpi_device_name(link
->device
),
400 acpi_device_bid(link
->device
), link
->irq
.active
, irq
);
401 link
->irq
.active
= irq
;
404 ACPI_DEBUG_PRINT((ACPI_DB_INFO
, "Set IRQ %d\n", link
->irq
.active
));
411 /* --------------------------------------------------------------------------
412 PCI Link IRQ Management
413 -------------------------------------------------------------------------- */
416 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
417 * Link Devices to move the PIRQs around to minimize sharing.
419 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
420 * that the BIOS has already set to active. This is necessary because
421 * ACPI has no automatic means of knowing what ISA IRQs are used. Note that
422 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
423 * even if acpi_irq_nobalance is set.
425 * A tables of penalties avoids directing PCI interrupts to well known
426 * ISA IRQs. Boot params are available to over-ride the default table:
428 * List interrupts that are free for PCI use.
431 * List interrupts that should not be used for PCI:
434 * Note that PCI IRQ routers have a list of possible IRQs,
435 * which may not include the IRQs this table says are available.
437 * Since this heuristic can't tell the difference between a link
438 * that no device will attach to, vs. a link which may be shared
439 * by multiple active devices -- it is not optimal.
441 * If interrupt performance is that important, get an IO-APIC system
442 * with a pin dedicated to each device. Or for that matter, an MSI
446 #define ACPI_MAX_IRQS 256
447 #define ACPI_MAX_ISA_IRQ 16
449 #define PIRQ_PENALTY_PCI_AVAILABLE (0)
450 #define PIRQ_PENALTY_PCI_POSSIBLE (16*16)
451 #define PIRQ_PENALTY_PCI_USING (16*16*16)
452 #define PIRQ_PENALTY_ISA_TYPICAL (16*16*16*16)
453 #define PIRQ_PENALTY_ISA_USED (16*16*16*16*16)
454 #define PIRQ_PENALTY_ISA_ALWAYS (16*16*16*16*16*16)
456 static int acpi_irq_penalty
[ACPI_MAX_IRQS
] = {
457 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ0 timer */
458 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ1 keyboard */
459 PIRQ_PENALTY_ISA_ALWAYS
, /* IRQ2 cascade */
460 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ3 serial */
461 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ4 serial */
462 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ5 sometimes SoundBlaster */
463 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ6 */
464 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ7 parallel, spurious */
465 PIRQ_PENALTY_ISA_TYPICAL
, /* IRQ8 rtc, sometimes */
466 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ9 PCI, often acpi */
467 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ10 PCI */
468 PIRQ_PENALTY_PCI_AVAILABLE
, /* IRQ11 PCI */
469 PIRQ_PENALTY_ISA_USED
, /* IRQ12 mouse */
470 PIRQ_PENALTY_ISA_USED
, /* IRQ13 fpe, sometimes */
471 PIRQ_PENALTY_ISA_USED
, /* IRQ14 ide0 */
472 PIRQ_PENALTY_ISA_USED
, /* IRQ15 ide1 */
476 int __init
acpi_irq_penalty_init(void)
478 struct list_head
*node
= NULL
;
479 struct acpi_pci_link
*link
= NULL
;
484 * Update penalties to facilitate IRQ balancing.
486 list_for_each(node
, &acpi_link
.entries
) {
488 link
= list_entry(node
, struct acpi_pci_link
, node
);
490 printk(KERN_ERR PREFIX
"Invalid link context\n");
495 * reflect the possible and active irqs in the penalty table --
496 * useful for breaking ties.
498 if (link
->irq
.possible_count
) {
500 PIRQ_PENALTY_PCI_POSSIBLE
/
501 link
->irq
.possible_count
;
503 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
504 if (link
->irq
.possible
[i
] < ACPI_MAX_ISA_IRQ
)
505 acpi_irq_penalty
[link
->irq
.
510 } else if (link
->irq
.active
) {
511 acpi_irq_penalty
[link
->irq
.active
] +=
512 PIRQ_PENALTY_PCI_POSSIBLE
;
515 /* Add a penalty for the SCI */
516 acpi_irq_penalty
[acpi_gbl_FADT
.sci_interrupt
] += PIRQ_PENALTY_PCI_USING
;
521 static int acpi_irq_balance
; /* 0: static, 1: balance */
523 static int acpi_pci_link_allocate(struct acpi_pci_link
*link
)
529 if (link
->irq
.initialized
) {
530 if (link
->refcnt
== 0)
531 /* This means the link is disabled but initialized */
532 acpi_pci_link_set(link
, link
->irq
.active
);
537 * search for active IRQ in list of possible IRQs.
539 for (i
= 0; i
< link
->irq
.possible_count
; ++i
) {
540 if (link
->irq
.active
== link
->irq
.possible
[i
])
544 * forget active IRQ that is not in possible list
546 if (i
== link
->irq
.possible_count
) {
548 printk(KERN_WARNING PREFIX
"_CRS %d not found"
549 " in _PRS\n", link
->irq
.active
);
550 link
->irq
.active
= 0;
554 * if active found, use it; else pick entry from end of possible list.
556 if (link
->irq
.active
) {
557 irq
= link
->irq
.active
;
559 irq
= link
->irq
.possible
[link
->irq
.possible_count
- 1];
562 if (acpi_irq_balance
|| !link
->irq
.active
) {
564 * Select the best IRQ. This is done in reverse to promote
565 * the use of IRQs 9, 10, 11, and >15.
567 for (i
= (link
->irq
.possible_count
- 1); i
>= 0; i
--) {
568 if (acpi_irq_penalty
[irq
] >
569 acpi_irq_penalty
[link
->irq
.possible
[i
]])
570 irq
= link
->irq
.possible
[i
];
574 /* Attempt to enable the link device at this IRQ. */
575 if (acpi_pci_link_set(link
, irq
)) {
576 printk(KERN_ERR PREFIX
"Unable to set IRQ for %s [%s]. "
577 "Try pci=noacpi or acpi=off\n",
578 acpi_device_name(link
->device
),
579 acpi_device_bid(link
->device
));
582 acpi_irq_penalty
[link
->irq
.active
] += PIRQ_PENALTY_PCI_USING
;
583 printk(PREFIX
"%s [%s] enabled at IRQ %d\n",
584 acpi_device_name(link
->device
),
585 acpi_device_bid(link
->device
), link
->irq
.active
);
588 link
->irq
.initialized
= 1;
594 * acpi_pci_link_allocate_irq
595 * success: return IRQ >= 0
600 acpi_pci_link_allocate_irq(acpi_handle handle
,
602 int *triggering
, int *polarity
, char **name
)
605 struct acpi_device
*device
= NULL
;
606 struct acpi_pci_link
*link
= NULL
;
609 result
= acpi_bus_get_device(handle
, &device
);
611 printk(KERN_ERR PREFIX
"Invalid link device\n");
615 link
= acpi_driver_data(device
);
617 printk(KERN_ERR PREFIX
"Invalid link context\n");
621 /* TBD: Support multiple index (IRQ) entries per Link Device */
623 printk(KERN_ERR PREFIX
"Invalid index %d\n", index
);
627 mutex_lock(&acpi_link_lock
);
628 if (acpi_pci_link_allocate(link
)) {
629 mutex_unlock(&acpi_link_lock
);
633 if (!link
->irq
.active
) {
634 mutex_unlock(&acpi_link_lock
);
635 printk(KERN_ERR PREFIX
"Link active IRQ is 0!\n");
639 mutex_unlock(&acpi_link_lock
);
642 *triggering
= link
->irq
.triggering
;
644 *polarity
= link
->irq
.polarity
;
646 *name
= acpi_device_bid(link
->device
);
647 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
648 "Link %s is referenced\n",
649 acpi_device_bid(link
->device
)));
650 return (link
->irq
.active
);
654 * We don't change link's irq information here. After it is reenabled, we
655 * continue use the info
657 int acpi_pci_link_free_irq(acpi_handle handle
)
659 struct acpi_device
*device
= NULL
;
660 struct acpi_pci_link
*link
= NULL
;
664 result
= acpi_bus_get_device(handle
, &device
);
666 printk(KERN_ERR PREFIX
"Invalid link device\n");
670 link
= acpi_driver_data(device
);
672 printk(KERN_ERR PREFIX
"Invalid link context\n");
676 mutex_lock(&acpi_link_lock
);
677 if (!link
->irq
.initialized
) {
678 mutex_unlock(&acpi_link_lock
);
679 printk(KERN_ERR PREFIX
"Link isn't initialized\n");
684 * The Link reference count allows us to _DISable an unused link
685 * and suspend time, and set it again on resume.
686 * However, 2.6.12 still has irq_router.resume
687 * which blindly restores the link state.
688 * So we disable the reference count method
689 * to prevent duplicate acpi_pci_link_set()
690 * which would harm some systems
694 ACPI_DEBUG_PRINT((ACPI_DB_INFO
,
695 "Link %s is dereferenced\n",
696 acpi_device_bid(link
->device
)));
698 if (link
->refcnt
== 0) {
699 acpi_ut_evaluate_object(link
->device
->handle
, "_DIS", 0, NULL
);
701 mutex_unlock(&acpi_link_lock
);
702 return (link
->irq
.active
);
705 /* --------------------------------------------------------------------------
707 -------------------------------------------------------------------------- */
709 static int acpi_pci_link_add(struct acpi_device
*device
)
712 struct acpi_pci_link
*link
= NULL
;
720 link
= kzalloc(sizeof(struct acpi_pci_link
), GFP_KERNEL
);
724 link
->device
= device
;
725 strcpy(acpi_device_name(device
), ACPI_PCI_LINK_DEVICE_NAME
);
726 strcpy(acpi_device_class(device
), ACPI_PCI_LINK_CLASS
);
727 acpi_driver_data(device
) = link
;
729 mutex_lock(&acpi_link_lock
);
730 result
= acpi_pci_link_get_possible(link
);
734 /* query and set link->irq.active */
735 acpi_pci_link_get_current(link
);
737 printk(PREFIX
"%s [%s] (IRQs", acpi_device_name(device
),
738 acpi_device_bid(device
));
739 for (i
= 0; i
< link
->irq
.possible_count
; i
++) {
740 if (link
->irq
.active
== link
->irq
.possible
[i
]) {
741 printk(" *%d", link
->irq
.possible
[i
]);
744 printk(" %d", link
->irq
.possible
[i
]);
750 printk(" *%d", link
->irq
.active
);
752 if (!link
->device
->status
.enabled
)
753 printk(", disabled.");
757 /* TBD: Acquire/release lock */
758 list_add_tail(&link
->node
, &acpi_link
.entries
);
762 /* disable all links -- to be activated on use */
763 acpi_ut_evaluate_object(device
->handle
, "_DIS", 0, NULL
);
764 mutex_unlock(&acpi_link_lock
);
772 static int acpi_pci_link_resume(struct acpi_pci_link
*link
)
775 if (link
->refcnt
&& link
->irq
.active
&& link
->irq
.initialized
)
776 return (acpi_pci_link_set(link
, link
->irq
.active
));
781 static int irqrouter_resume(struct sys_device
*dev
)
783 struct list_head
*node
= NULL
;
784 struct acpi_pci_link
*link
= NULL
;
787 /* Make sure SCI is enabled again (Apple firmware bug?) */
788 acpi_set_register(ACPI_BITREG_SCI_ENABLE
, 1);
790 list_for_each(node
, &acpi_link
.entries
) {
791 link
= list_entry(node
, struct acpi_pci_link
, node
);
793 printk(KERN_ERR PREFIX
"Invalid link context\n");
796 acpi_pci_link_resume(link
);
801 static int acpi_pci_link_remove(struct acpi_device
*device
, int type
)
803 struct acpi_pci_link
*link
= NULL
;
806 if (!device
|| !acpi_driver_data(device
))
809 link
= acpi_driver_data(device
);
811 mutex_lock(&acpi_link_lock
);
812 list_del(&link
->node
);
813 mutex_unlock(&acpi_link_lock
);
821 * modify acpi_irq_penalty[] from cmdline
823 static int __init
acpi_irq_penalty_update(char *str
, int used
)
827 for (i
= 0; i
< 16; i
++) {
831 retval
= get_option(&str
, &irq
);
834 break; /* no number found */
839 if (irq
>= ACPI_MAX_IRQS
)
843 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
845 acpi_irq_penalty
[irq
] = PIRQ_PENALTY_PCI_AVAILABLE
;
847 if (retval
!= 2) /* no next number */
854 * We'd like PNP to call this routine for the
855 * single ISA_USED value for each legacy device.
856 * But instead it calls us with each POSSIBLE setting.
857 * There is no ISA_POSSIBLE weight, so we simply use
858 * the (small) PCI_USING penalty.
860 void acpi_penalize_isa_irq(int irq
, int active
)
863 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_ISA_USED
;
865 acpi_irq_penalty
[irq
] += PIRQ_PENALTY_PCI_USING
;
869 * Over-ride default table to reserve additional IRQs for use by ISA
870 * e.g. acpi_irq_isa=5
871 * Useful for telling ACPI how not to interfere with your ISA sound card.
873 static int __init
acpi_irq_isa(char *str
)
875 return acpi_irq_penalty_update(str
, 1);
878 __setup("acpi_irq_isa=", acpi_irq_isa
);
881 * Over-ride default table to free additional IRQs for use by PCI
882 * e.g. acpi_irq_pci=7,15
883 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
885 static int __init
acpi_irq_pci(char *str
)
887 return acpi_irq_penalty_update(str
, 0);
890 __setup("acpi_irq_pci=", acpi_irq_pci
);
892 static int __init
acpi_irq_nobalance_set(char *str
)
894 acpi_irq_balance
= 0;
898 __setup("acpi_irq_nobalance", acpi_irq_nobalance_set
);
900 int __init
acpi_irq_balance_set(char *str
)
902 acpi_irq_balance
= 1;
906 __setup("acpi_irq_balance", acpi_irq_balance_set
);
908 /* FIXME: we will remove this interface after all drivers call pci_disable_device */
909 static struct sysdev_class irqrouter_sysdev_class
= {
910 set_kset_name("irqrouter"),
911 .resume
= irqrouter_resume
,
914 static struct sys_device device_irqrouter
= {
916 .cls
= &irqrouter_sysdev_class
,
919 static int __init
irqrouter_init_sysfs(void)
924 if (acpi_disabled
|| acpi_noirq
)
927 error
= sysdev_class_register(&irqrouter_sysdev_class
);
929 error
= sysdev_register(&device_irqrouter
);
934 device_initcall(irqrouter_init_sysfs
);
936 static int __init
acpi_pci_link_init(void)
943 INIT_LIST_HEAD(&acpi_link
.entries
);
945 if (acpi_bus_register_driver(&acpi_pci_link_driver
) < 0)
951 subsys_initcall(acpi_pci_link_init
);