2 * drivers/acpi/resource.c - ACPI device resources interpretation.
4 * Copyright (C) 2012, Intel Corp.
5 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 #include <linux/acpi.h>
26 #include <linux/device.h>
27 #include <linux/export.h>
28 #include <linux/ioport.h>
29 #include <linux/slab.h>
32 #define valid_IRQ(i) (((i) != 0) && ((i) != 2))
34 #define valid_IRQ(i) (true)
37 static bool acpi_dev_resource_len_valid(u64 start
, u64 end
, u64 len
, bool io
)
39 u64 reslen
= end
- start
+ 1;
42 * CHECKME: len might be required to check versus a minimum
43 * length as well. 1 for io is fine, but for memory it does
44 * not make any sense at all.
46 if (len
&& reslen
&& reslen
== len
&& start
<= end
)
49 pr_info("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
50 io
? "io" : "mem", start
, end
, len
);
55 static void acpi_dev_memresource_flags(struct resource
*res
, u64 len
,
58 res
->flags
= IORESOURCE_MEM
;
60 if (!acpi_dev_resource_len_valid(res
->start
, res
->end
, len
, false))
61 res
->flags
|= IORESOURCE_DISABLED
| IORESOURCE_UNSET
;
63 if (write_protect
== ACPI_READ_WRITE_MEMORY
)
64 res
->flags
|= IORESOURCE_MEM_WRITEABLE
;
67 static void acpi_dev_get_memresource(struct resource
*res
, u64 start
, u64 len
,
71 res
->end
= start
+ len
- 1;
72 acpi_dev_memresource_flags(res
, len
, write_protect
);
76 * acpi_dev_resource_memory - Extract ACPI memory resource information.
77 * @ares: Input ACPI resource object.
78 * @res: Output generic resource object.
80 * Check if the given ACPI resource object represents a memory resource and
81 * if that's the case, use the information in it to populate the generic
82 * resource object pointed to by @res.
85 * 1) false with res->flags setting to zero: not the expected resource type
86 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
87 * 3) true: valid assigned resource
89 bool acpi_dev_resource_memory(struct acpi_resource
*ares
, struct resource
*res
)
91 struct acpi_resource_memory24
*memory24
;
92 struct acpi_resource_memory32
*memory32
;
93 struct acpi_resource_fixed_memory32
*fixed_memory32
;
96 case ACPI_RESOURCE_TYPE_MEMORY24
:
97 memory24
= &ares
->data
.memory24
;
98 acpi_dev_get_memresource(res
, memory24
->minimum
<< 8,
99 memory24
->address_length
<< 8,
100 memory24
->write_protect
);
102 case ACPI_RESOURCE_TYPE_MEMORY32
:
103 memory32
= &ares
->data
.memory32
;
104 acpi_dev_get_memresource(res
, memory32
->minimum
,
105 memory32
->address_length
,
106 memory32
->write_protect
);
108 case ACPI_RESOURCE_TYPE_FIXED_MEMORY32
:
109 fixed_memory32
= &ares
->data
.fixed_memory32
;
110 acpi_dev_get_memresource(res
, fixed_memory32
->address
,
111 fixed_memory32
->address_length
,
112 fixed_memory32
->write_protect
);
119 return !(res
->flags
& IORESOURCE_DISABLED
);
121 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory
);
123 static void acpi_dev_ioresource_flags(struct resource
*res
, u64 len
,
126 res
->flags
= IORESOURCE_IO
;
128 if (!acpi_dev_resource_len_valid(res
->start
, res
->end
, len
, true))
129 res
->flags
|= IORESOURCE_DISABLED
| IORESOURCE_UNSET
;
131 if (res
->end
>= 0x10003)
132 res
->flags
|= IORESOURCE_DISABLED
| IORESOURCE_UNSET
;
134 if (io_decode
== ACPI_DECODE_16
)
135 res
->flags
|= IORESOURCE_IO_16BIT_ADDR
;
138 static void acpi_dev_get_ioresource(struct resource
*res
, u64 start
, u64 len
,
142 res
->end
= start
+ len
- 1;
143 acpi_dev_ioresource_flags(res
, len
, io_decode
);
147 * acpi_dev_resource_io - Extract ACPI I/O resource information.
148 * @ares: Input ACPI resource object.
149 * @res: Output generic resource object.
151 * Check if the given ACPI resource object represents an I/O resource and
152 * if that's the case, use the information in it to populate the generic
153 * resource object pointed to by @res.
156 * 1) false with res->flags setting to zero: not the expected resource type
157 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
158 * 3) true: valid assigned resource
160 bool acpi_dev_resource_io(struct acpi_resource
*ares
, struct resource
*res
)
162 struct acpi_resource_io
*io
;
163 struct acpi_resource_fixed_io
*fixed_io
;
165 switch (ares
->type
) {
166 case ACPI_RESOURCE_TYPE_IO
:
168 acpi_dev_get_ioresource(res
, io
->minimum
,
172 case ACPI_RESOURCE_TYPE_FIXED_IO
:
173 fixed_io
= &ares
->data
.fixed_io
;
174 acpi_dev_get_ioresource(res
, fixed_io
->address
,
175 fixed_io
->address_length
,
183 return !(res
->flags
& IORESOURCE_DISABLED
);
185 EXPORT_SYMBOL_GPL(acpi_dev_resource_io
);
187 static bool acpi_decode_space(struct resource_win
*win
,
188 struct acpi_resource_address
*addr
,
189 struct acpi_address64_attribute
*attr
)
191 u8 iodec
= attr
->granularity
== 0xfff ? ACPI_DECODE_10
: ACPI_DECODE_16
;
192 bool wp
= addr
->info
.mem
.write_protect
;
193 u64 len
= attr
->address_length
;
194 struct resource
*res
= &win
->res
;
197 * Filter out invalid descriptor according to ACPI Spec 5.0, section
198 * 6.4.3.5 Address Space Resource Descriptors.
200 if ((addr
->min_address_fixed
!= addr
->max_address_fixed
&& len
) ||
201 (addr
->min_address_fixed
&& addr
->max_address_fixed
&& !len
))
202 pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
203 addr
->min_address_fixed
, addr
->max_address_fixed
, len
);
205 res
->start
= attr
->minimum
;
206 res
->end
= attr
->maximum
;
209 * For bridges that translate addresses across the bridge,
210 * translation_offset is the offset that must be added to the
211 * address on the secondary side to obtain the address on the
212 * primary side. Non-bridge devices must list 0 for all Address
213 * Translation offset bits.
215 if (addr
->producer_consumer
== ACPI_PRODUCER
) {
216 res
->start
+= attr
->translation_offset
;
217 res
->end
+= attr
->translation_offset
;
218 } else if (attr
->translation_offset
) {
219 pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
220 attr
->translation_offset
);
223 switch (addr
->resource_type
) {
224 case ACPI_MEMORY_RANGE
:
225 acpi_dev_memresource_flags(res
, len
, wp
);
228 acpi_dev_ioresource_flags(res
, len
, iodec
);
230 case ACPI_BUS_NUMBER_RANGE
:
231 res
->flags
= IORESOURCE_BUS
;
237 win
->offset
= attr
->translation_offset
;
239 if (addr
->producer_consumer
== ACPI_PRODUCER
)
240 res
->flags
|= IORESOURCE_WINDOW
;
242 if (addr
->info
.mem
.caching
== ACPI_PREFETCHABLE_MEMORY
)
243 res
->flags
|= IORESOURCE_PREFETCH
;
245 return !(res
->flags
& IORESOURCE_DISABLED
);
249 * acpi_dev_resource_address_space - Extract ACPI address space information.
250 * @ares: Input ACPI resource object.
251 * @win: Output generic resource object.
253 * Check if the given ACPI resource object represents an address space resource
254 * and if that's the case, use the information in it to populate the generic
255 * resource object pointed to by @win.
258 * 1) false with win->res.flags setting to zero: not the expected resource type
259 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
261 * 3) true: valid assigned resource
263 bool acpi_dev_resource_address_space(struct acpi_resource
*ares
,
264 struct resource_win
*win
)
266 struct acpi_resource_address64 addr
;
269 if (ACPI_FAILURE(acpi_resource_to_address64(ares
, &addr
)))
272 return acpi_decode_space(win
, (struct acpi_resource_address
*)&addr
,
275 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space
);
278 * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
279 * @ares: Input ACPI resource object.
280 * @win: Output generic resource object.
282 * Check if the given ACPI resource object represents an extended address space
283 * resource and if that's the case, use the information in it to populate the
284 * generic resource object pointed to by @win.
287 * 1) false with win->res.flags setting to zero: not the expected resource type
288 * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
290 * 3) true: valid assigned resource
292 bool acpi_dev_resource_ext_address_space(struct acpi_resource
*ares
,
293 struct resource_win
*win
)
295 struct acpi_resource_extended_address64
*ext_addr
;
298 if (ares
->type
!= ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64
)
301 ext_addr
= &ares
->data
.ext_address64
;
303 return acpi_decode_space(win
, (struct acpi_resource_address
*)ext_addr
,
306 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space
);
309 * acpi_dev_irq_flags - Determine IRQ resource flags.
310 * @triggering: Triggering type as provided by ACPI.
311 * @polarity: Interrupt polarity as provided by ACPI.
312 * @shareable: Whether or not the interrupt is shareable.
314 unsigned long acpi_dev_irq_flags(u8 triggering
, u8 polarity
, u8 shareable
)
318 if (triggering
== ACPI_LEVEL_SENSITIVE
)
319 flags
= polarity
== ACPI_ACTIVE_LOW
?
320 IORESOURCE_IRQ_LOWLEVEL
: IORESOURCE_IRQ_HIGHLEVEL
;
322 flags
= polarity
== ACPI_ACTIVE_LOW
?
323 IORESOURCE_IRQ_LOWEDGE
: IORESOURCE_IRQ_HIGHEDGE
;
325 if (shareable
== ACPI_SHARED
)
326 flags
|= IORESOURCE_IRQ_SHAREABLE
;
328 return flags
| IORESOURCE_IRQ
;
330 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags
);
332 static void acpi_dev_irqresource_disabled(struct resource
*res
, u32 gsi
)
336 res
->flags
= IORESOURCE_IRQ
| IORESOURCE_DISABLED
| IORESOURCE_UNSET
;
339 static void acpi_dev_get_irqresource(struct resource
*res
, u32 gsi
,
340 u8 triggering
, u8 polarity
, u8 shareable
,
345 if (!valid_IRQ(gsi
)) {
346 acpi_dev_irqresource_disabled(res
, gsi
);
351 * In IO-APIC mode, use overrided attribute. Two reasons:
352 * 1. BIOS bug in DSDT
353 * 2. BIOS uses IO-APIC mode Interrupt Source Override
355 * We do this only if we are dealing with IRQ() or IRQNoFlags()
356 * resource (the legacy ISA resources). With modern ACPI 5 devices
357 * using extended IRQ descriptors we take the IRQ configuration
358 * from _CRS directly.
360 if (legacy
&& !acpi_get_override_irq(gsi
, &t
, &p
)) {
361 u8 trig
= t
? ACPI_LEVEL_SENSITIVE
: ACPI_EDGE_SENSITIVE
;
362 u8 pol
= p
? ACPI_ACTIVE_LOW
: ACPI_ACTIVE_HIGH
;
364 if (triggering
!= trig
|| polarity
!= pol
) {
365 pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi
,
366 t
? "level" : "edge", p
? "low" : "high");
372 res
->flags
= acpi_dev_irq_flags(triggering
, polarity
, shareable
);
373 irq
= acpi_register_gsi(NULL
, gsi
, triggering
, polarity
);
378 acpi_dev_irqresource_disabled(res
, gsi
);
383 * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
384 * @ares: Input ACPI resource object.
385 * @index: Index into the array of GSIs represented by the resource.
386 * @res: Output generic resource object.
388 * Check if the given ACPI resource object represents an interrupt resource
389 * and @index does not exceed the resource's interrupt count (true is returned
390 * in that case regardless of the results of the other checks)). If that's the
391 * case, register the GSI corresponding to @index from the array of interrupts
392 * represented by the resource and populate the generic resource object pointed
393 * to by @res accordingly. If the registration of the GSI is not successful,
394 * IORESOURCE_DISABLED will be set it that object's flags.
397 * 1) false with res->flags setting to zero: not the expected resource type
398 * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
399 * 3) true: valid assigned resource
401 bool acpi_dev_resource_interrupt(struct acpi_resource
*ares
, int index
,
402 struct resource
*res
)
404 struct acpi_resource_irq
*irq
;
405 struct acpi_resource_extended_irq
*ext_irq
;
407 switch (ares
->type
) {
408 case ACPI_RESOURCE_TYPE_IRQ
:
410 * Per spec, only one interrupt per descriptor is allowed in
411 * _CRS, but some firmware violates this, so parse them all.
413 irq
= &ares
->data
.irq
;
414 if (index
>= irq
->interrupt_count
) {
415 acpi_dev_irqresource_disabled(res
, 0);
418 acpi_dev_get_irqresource(res
, irq
->interrupts
[index
],
419 irq
->triggering
, irq
->polarity
,
420 irq
->sharable
, true);
422 case ACPI_RESOURCE_TYPE_EXTENDED_IRQ
:
423 ext_irq
= &ares
->data
.extended_irq
;
424 if (index
>= ext_irq
->interrupt_count
) {
425 acpi_dev_irqresource_disabled(res
, 0);
428 acpi_dev_get_irqresource(res
, ext_irq
->interrupts
[index
],
429 ext_irq
->triggering
, ext_irq
->polarity
,
430 ext_irq
->sharable
, false);
439 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt
);
442 * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
443 * @list: The head of the resource list to free.
445 void acpi_dev_free_resource_list(struct list_head
*list
)
447 struct resource_list_entry
*rentry
, *re
;
449 list_for_each_entry_safe(rentry
, re
, list
, node
) {
450 list_del(&rentry
->node
);
454 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list
);
456 struct res_proc_context
{
457 struct list_head
*list
;
458 int (*preproc
)(struct acpi_resource
*, void *);
464 static acpi_status
acpi_dev_new_resource_entry(struct resource_win
*win
,
465 struct res_proc_context
*c
)
467 struct resource_list_entry
*rentry
;
469 rentry
= kmalloc(sizeof(*rentry
), GFP_KERNEL
);
474 rentry
->res
= win
->res
;
475 rentry
->offset
= win
->offset
;
476 list_add_tail(&rentry
->node
, c
->list
);
481 static acpi_status
acpi_dev_process_resource(struct acpi_resource
*ares
,
484 struct res_proc_context
*c
= context
;
485 struct resource_win win
;
486 struct resource
*res
= &win
.res
;
492 ret
= c
->preproc(ares
, c
->preproc_data
);
495 return AE_CTRL_TERMINATE
;
496 } else if (ret
> 0) {
501 memset(&win
, 0, sizeof(win
));
503 if (acpi_dev_resource_memory(ares
, res
)
504 || acpi_dev_resource_io(ares
, res
)
505 || acpi_dev_resource_address_space(ares
, &win
)
506 || acpi_dev_resource_ext_address_space(ares
, &win
))
507 return acpi_dev_new_resource_entry(&win
, c
);
509 for (i
= 0; acpi_dev_resource_interrupt(ares
, i
, res
); i
++) {
512 status
= acpi_dev_new_resource_entry(&win
, c
);
513 if (ACPI_FAILURE(status
))
521 * acpi_dev_get_resources - Get current resources of a device.
522 * @adev: ACPI device node to get the resources for.
523 * @list: Head of the resultant list of resources (must be empty).
524 * @preproc: The caller's preprocessing routine.
525 * @preproc_data: Pointer passed to the caller's preprocessing routine.
527 * Evaluate the _CRS method for the given device node and process its output by
528 * (1) executing the @preproc() rountine provided by the caller, passing the
529 * resource pointer and @preproc_data to it as arguments, for each ACPI resource
530 * returned and (2) converting all of the returned ACPI resources into struct
531 * resource objects if possible. If the return value of @preproc() in step (1)
532 * is different from 0, step (2) is not applied to the given ACPI resource and
533 * if that value is negative, the whole processing is aborted and that value is
534 * returned as the final error code.
536 * The resultant struct resource objects are put on the list pointed to by
537 * @list, that must be empty initially, as members of struct resource_list_entry
538 * objects. Callers of this routine should use %acpi_dev_free_resource_list() to
541 * The number of resources in the output list is returned on success, an error
542 * code reflecting the error condition is returned otherwise.
544 int acpi_dev_get_resources(struct acpi_device
*adev
, struct list_head
*list
,
545 int (*preproc
)(struct acpi_resource
*, void *),
548 struct res_proc_context c
;
551 if (!adev
|| !adev
->handle
|| !list_empty(list
))
554 if (!acpi_has_method(adev
->handle
, METHOD_NAME__CRS
))
559 c
.preproc_data
= preproc_data
;
562 status
= acpi_walk_resources(adev
->handle
, METHOD_NAME__CRS
,
563 acpi_dev_process_resource
, &c
);
564 if (ACPI_FAILURE(status
)) {
565 acpi_dev_free_resource_list(list
);
566 return c
.error
? c
.error
: -EIO
;
571 EXPORT_SYMBOL_GPL(acpi_dev_get_resources
);