xref: /openbmc/linux/drivers/acpi/resource.c (revision 4f3db074)
1 /*
2  * drivers/acpi/resource.c - ACPI device resources interpretation.
3  *
4  * Copyright (C) 2012, Intel Corp.
5  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
6  *
7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8  *
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.
12  *
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.
17  *
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.
21  *
22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
23  */
24 
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>
30 
31 #ifdef CONFIG_X86
32 #define valid_IRQ(i) (((i) != 0) && ((i) != 2))
33 #else
34 #define valid_IRQ(i) (true)
35 #endif
36 
37 static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
38 {
39 	u64 reslen = end - start + 1;
40 
41 	/*
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.
45 	 * Note: some BIOSes report incorrect length for ACPI address space
46 	 * descriptor, so remove check of 'reslen == len' to avoid regression.
47 	 */
48 	if (len && reslen && start <= end)
49 		return true;
50 
51 	pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
52 		io ? "io" : "mem", start, end, len);
53 
54 	return false;
55 }
56 
57 static void acpi_dev_memresource_flags(struct resource *res, u64 len,
58 				       u8 write_protect)
59 {
60 	res->flags = IORESOURCE_MEM;
61 
62 	if (!acpi_dev_resource_len_valid(res->start, res->end, len, false))
63 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
64 
65 	if (write_protect == ACPI_READ_WRITE_MEMORY)
66 		res->flags |= IORESOURCE_MEM_WRITEABLE;
67 }
68 
69 static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
70 				     u8 write_protect)
71 {
72 	res->start = start;
73 	res->end = start + len - 1;
74 	acpi_dev_memresource_flags(res, len, write_protect);
75 }
76 
77 /**
78  * acpi_dev_resource_memory - Extract ACPI memory resource information.
79  * @ares: Input ACPI resource object.
80  * @res: Output generic resource object.
81  *
82  * Check if the given ACPI resource object represents a memory resource and
83  * if that's the case, use the information in it to populate the generic
84  * resource object pointed to by @res.
85  *
86  * Return:
87  * 1) false with res->flags setting to zero: not the expected resource type
88  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
89  * 3) true: valid assigned resource
90  */
91 bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
92 {
93 	struct acpi_resource_memory24 *memory24;
94 	struct acpi_resource_memory32 *memory32;
95 	struct acpi_resource_fixed_memory32 *fixed_memory32;
96 
97 	switch (ares->type) {
98 	case ACPI_RESOURCE_TYPE_MEMORY24:
99 		memory24 = &ares->data.memory24;
100 		acpi_dev_get_memresource(res, memory24->minimum << 8,
101 					 memory24->address_length << 8,
102 					 memory24->write_protect);
103 		break;
104 	case ACPI_RESOURCE_TYPE_MEMORY32:
105 		memory32 = &ares->data.memory32;
106 		acpi_dev_get_memresource(res, memory32->minimum,
107 					 memory32->address_length,
108 					 memory32->write_protect);
109 		break;
110 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
111 		fixed_memory32 = &ares->data.fixed_memory32;
112 		acpi_dev_get_memresource(res, fixed_memory32->address,
113 					 fixed_memory32->address_length,
114 					 fixed_memory32->write_protect);
115 		break;
116 	default:
117 		res->flags = 0;
118 		return false;
119 	}
120 
121 	return !(res->flags & IORESOURCE_DISABLED);
122 }
123 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
124 
125 static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
126 				      u8 io_decode)
127 {
128 	res->flags = IORESOURCE_IO;
129 
130 	if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
131 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
132 
133 	if (res->end >= 0x10003)
134 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
135 
136 	if (io_decode == ACPI_DECODE_16)
137 		res->flags |= IORESOURCE_IO_16BIT_ADDR;
138 }
139 
140 static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
141 				    u8 io_decode)
142 {
143 	res->start = start;
144 	res->end = start + len - 1;
145 	acpi_dev_ioresource_flags(res, len, io_decode);
146 }
147 
148 /**
149  * acpi_dev_resource_io - Extract ACPI I/O resource information.
150  * @ares: Input ACPI resource object.
151  * @res: Output generic resource object.
152  *
153  * Check if the given ACPI resource object represents an I/O resource and
154  * if that's the case, use the information in it to populate the generic
155  * resource object pointed to by @res.
156  *
157  * Return:
158  * 1) false with res->flags setting to zero: not the expected resource type
159  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
160  * 3) true: valid assigned resource
161  */
162 bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
163 {
164 	struct acpi_resource_io *io;
165 	struct acpi_resource_fixed_io *fixed_io;
166 
167 	switch (ares->type) {
168 	case ACPI_RESOURCE_TYPE_IO:
169 		io = &ares->data.io;
170 		acpi_dev_get_ioresource(res, io->minimum,
171 					io->address_length,
172 					io->io_decode);
173 		break;
174 	case ACPI_RESOURCE_TYPE_FIXED_IO:
175 		fixed_io = &ares->data.fixed_io;
176 		acpi_dev_get_ioresource(res, fixed_io->address,
177 					fixed_io->address_length,
178 					ACPI_DECODE_10);
179 		break;
180 	default:
181 		res->flags = 0;
182 		return false;
183 	}
184 
185 	return !(res->flags & IORESOURCE_DISABLED);
186 }
187 EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
188 
189 static bool acpi_decode_space(struct resource_win *win,
190 			      struct acpi_resource_address *addr,
191 			      struct acpi_address64_attribute *attr)
192 {
193 	u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
194 	bool wp = addr->info.mem.write_protect;
195 	u64 len = attr->address_length;
196 	struct resource *res = &win->res;
197 
198 	/*
199 	 * Filter out invalid descriptor according to ACPI Spec 5.0, section
200 	 * 6.4.3.5 Address Space Resource Descriptors.
201 	 */
202 	if ((addr->min_address_fixed != addr->max_address_fixed && len) ||
203 	    (addr->min_address_fixed && addr->max_address_fixed && !len))
204 		pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
205 			 addr->min_address_fixed, addr->max_address_fixed, len);
206 
207 	res->start = attr->minimum;
208 	res->end = attr->maximum;
209 
210 	/*
211 	 * For bridges that translate addresses across the bridge,
212 	 * translation_offset is the offset that must be added to the
213 	 * address on the secondary side to obtain the address on the
214 	 * primary side. Non-bridge devices must list 0 for all Address
215 	 * Translation offset bits.
216 	 */
217 	if (addr->producer_consumer == ACPI_PRODUCER) {
218 		res->start += attr->translation_offset;
219 		res->end += attr->translation_offset;
220 	} else if (attr->translation_offset) {
221 		pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
222 			 attr->translation_offset);
223 	}
224 
225 	switch (addr->resource_type) {
226 	case ACPI_MEMORY_RANGE:
227 		acpi_dev_memresource_flags(res, len, wp);
228 		break;
229 	case ACPI_IO_RANGE:
230 		acpi_dev_ioresource_flags(res, len, iodec);
231 		break;
232 	case ACPI_BUS_NUMBER_RANGE:
233 		res->flags = IORESOURCE_BUS;
234 		break;
235 	default:
236 		return false;
237 	}
238 
239 	win->offset = attr->translation_offset;
240 
241 	if (addr->producer_consumer == ACPI_PRODUCER)
242 		res->flags |= IORESOURCE_WINDOW;
243 
244 	if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
245 		res->flags |= IORESOURCE_PREFETCH;
246 
247 	return !(res->flags & IORESOURCE_DISABLED);
248 }
249 
250 /**
251  * acpi_dev_resource_address_space - Extract ACPI address space information.
252  * @ares: Input ACPI resource object.
253  * @win: Output generic resource object.
254  *
255  * Check if the given ACPI resource object represents an address space resource
256  * and if that's the case, use the information in it to populate the generic
257  * resource object pointed to by @win.
258  *
259  * Return:
260  * 1) false with win->res.flags setting to zero: not the expected resource type
261  * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
262  *    resource
263  * 3) true: valid assigned resource
264  */
265 bool acpi_dev_resource_address_space(struct acpi_resource *ares,
266 				     struct resource_win *win)
267 {
268 	struct acpi_resource_address64 addr;
269 
270 	win->res.flags = 0;
271 	if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
272 		return false;
273 
274 	return acpi_decode_space(win, (struct acpi_resource_address *)&addr,
275 				 &addr.address);
276 }
277 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
278 
279 /**
280  * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
281  * @ares: Input ACPI resource object.
282  * @win: Output generic resource object.
283  *
284  * Check if the given ACPI resource object represents an extended address space
285  * resource and if that's the case, use the information in it to populate the
286  * generic resource object pointed to by @win.
287  *
288  * Return:
289  * 1) false with win->res.flags setting to zero: not the expected resource type
290  * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
291  *    resource
292  * 3) true: valid assigned resource
293  */
294 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
295 					 struct resource_win *win)
296 {
297 	struct acpi_resource_extended_address64 *ext_addr;
298 
299 	win->res.flags = 0;
300 	if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
301 		return false;
302 
303 	ext_addr = &ares->data.ext_address64;
304 
305 	return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,
306 				 &ext_addr->address);
307 }
308 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
309 
310 /**
311  * acpi_dev_irq_flags - Determine IRQ resource flags.
312  * @triggering: Triggering type as provided by ACPI.
313  * @polarity: Interrupt polarity as provided by ACPI.
314  * @shareable: Whether or not the interrupt is shareable.
315  */
316 unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
317 {
318 	unsigned long flags;
319 
320 	if (triggering == ACPI_LEVEL_SENSITIVE)
321 		flags = polarity == ACPI_ACTIVE_LOW ?
322 			IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
323 	else
324 		flags = polarity == ACPI_ACTIVE_LOW ?
325 			IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
326 
327 	if (shareable == ACPI_SHARED)
328 		flags |= IORESOURCE_IRQ_SHAREABLE;
329 
330 	return flags | IORESOURCE_IRQ;
331 }
332 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
333 
334 static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
335 {
336 	res->start = gsi;
337 	res->end = gsi;
338 	res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
339 }
340 
341 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
342 				     u8 triggering, u8 polarity, u8 shareable,
343 				     bool legacy)
344 {
345 	int irq, p, t;
346 
347 	if (!valid_IRQ(gsi)) {
348 		acpi_dev_irqresource_disabled(res, gsi);
349 		return;
350 	}
351 
352 	/*
353 	 * In IO-APIC mode, use overrided attribute. Two reasons:
354 	 * 1. BIOS bug in DSDT
355 	 * 2. BIOS uses IO-APIC mode Interrupt Source Override
356 	 *
357 	 * We do this only if we are dealing with IRQ() or IRQNoFlags()
358 	 * resource (the legacy ISA resources). With modern ACPI 5 devices
359 	 * using extended IRQ descriptors we take the IRQ configuration
360 	 * from _CRS directly.
361 	 */
362 	if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
363 		u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
364 		u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
365 
366 		if (triggering != trig || polarity != pol) {
367 			pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
368 				   t ? "level" : "edge", p ? "low" : "high");
369 			triggering = trig;
370 			polarity = pol;
371 		}
372 	}
373 
374 	res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
375 	irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
376 	if (irq >= 0) {
377 		res->start = irq;
378 		res->end = irq;
379 	} else {
380 		acpi_dev_irqresource_disabled(res, gsi);
381 	}
382 }
383 
384 /**
385  * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
386  * @ares: Input ACPI resource object.
387  * @index: Index into the array of GSIs represented by the resource.
388  * @res: Output generic resource object.
389  *
390  * Check if the given ACPI resource object represents an interrupt resource
391  * and @index does not exceed the resource's interrupt count (true is returned
392  * in that case regardless of the results of the other checks)).  If that's the
393  * case, register the GSI corresponding to @index from the array of interrupts
394  * represented by the resource and populate the generic resource object pointed
395  * to by @res accordingly.  If the registration of the GSI is not successful,
396  * IORESOURCE_DISABLED will be set it that object's flags.
397  *
398  * Return:
399  * 1) false with res->flags setting to zero: not the expected resource type
400  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
401  * 3) true: valid assigned resource
402  */
403 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
404 				 struct resource *res)
405 {
406 	struct acpi_resource_irq *irq;
407 	struct acpi_resource_extended_irq *ext_irq;
408 
409 	switch (ares->type) {
410 	case ACPI_RESOURCE_TYPE_IRQ:
411 		/*
412 		 * Per spec, only one interrupt per descriptor is allowed in
413 		 * _CRS, but some firmware violates this, so parse them all.
414 		 */
415 		irq = &ares->data.irq;
416 		if (index >= irq->interrupt_count) {
417 			acpi_dev_irqresource_disabled(res, 0);
418 			return false;
419 		}
420 		acpi_dev_get_irqresource(res, irq->interrupts[index],
421 					 irq->triggering, irq->polarity,
422 					 irq->sharable, true);
423 		break;
424 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
425 		ext_irq = &ares->data.extended_irq;
426 		if (index >= ext_irq->interrupt_count) {
427 			acpi_dev_irqresource_disabled(res, 0);
428 			return false;
429 		}
430 		acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
431 					 ext_irq->triggering, ext_irq->polarity,
432 					 ext_irq->sharable, false);
433 		break;
434 	default:
435 		res->flags = 0;
436 		return false;
437 	}
438 
439 	return true;
440 }
441 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
442 
443 /**
444  * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
445  * @list: The head of the resource list to free.
446  */
447 void acpi_dev_free_resource_list(struct list_head *list)
448 {
449 	resource_list_free(list);
450 }
451 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
452 
453 struct res_proc_context {
454 	struct list_head *list;
455 	int (*preproc)(struct acpi_resource *, void *);
456 	void *preproc_data;
457 	int count;
458 	int error;
459 };
460 
461 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
462 					       struct res_proc_context *c)
463 {
464 	struct resource_entry *rentry;
465 
466 	rentry = resource_list_create_entry(NULL, 0);
467 	if (!rentry) {
468 		c->error = -ENOMEM;
469 		return AE_NO_MEMORY;
470 	}
471 	*rentry->res = win->res;
472 	rentry->offset = win->offset;
473 	resource_list_add_tail(rentry, c->list);
474 	c->count++;
475 	return AE_OK;
476 }
477 
478 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
479 					     void *context)
480 {
481 	struct res_proc_context *c = context;
482 	struct resource_win win;
483 	struct resource *res = &win.res;
484 	int i;
485 
486 	if (c->preproc) {
487 		int ret;
488 
489 		ret = c->preproc(ares, c->preproc_data);
490 		if (ret < 0) {
491 			c->error = ret;
492 			return AE_CTRL_TERMINATE;
493 		} else if (ret > 0) {
494 			return AE_OK;
495 		}
496 	}
497 
498 	memset(&win, 0, sizeof(win));
499 
500 	if (acpi_dev_resource_memory(ares, res)
501 	    || acpi_dev_resource_io(ares, res)
502 	    || acpi_dev_resource_address_space(ares, &win)
503 	    || acpi_dev_resource_ext_address_space(ares, &win))
504 		return acpi_dev_new_resource_entry(&win, c);
505 
506 	for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
507 		acpi_status status;
508 
509 		status = acpi_dev_new_resource_entry(&win, c);
510 		if (ACPI_FAILURE(status))
511 			return status;
512 	}
513 
514 	return AE_OK;
515 }
516 
517 /**
518  * acpi_dev_get_resources - Get current resources of a device.
519  * @adev: ACPI device node to get the resources for.
520  * @list: Head of the resultant list of resources (must be empty).
521  * @preproc: The caller's preprocessing routine.
522  * @preproc_data: Pointer passed to the caller's preprocessing routine.
523  *
524  * Evaluate the _CRS method for the given device node and process its output by
525  * (1) executing the @preproc() rountine provided by the caller, passing the
526  * resource pointer and @preproc_data to it as arguments, for each ACPI resource
527  * returned and (2) converting all of the returned ACPI resources into struct
528  * resource objects if possible.  If the return value of @preproc() in step (1)
529  * is different from 0, step (2) is not applied to the given ACPI resource and
530  * if that value is negative, the whole processing is aborted and that value is
531  * returned as the final error code.
532  *
533  * The resultant struct resource objects are put on the list pointed to by
534  * @list, that must be empty initially, as members of struct resource_entry
535  * objects.  Callers of this routine should use %acpi_dev_free_resource_list() to
536  * free that list.
537  *
538  * The number of resources in the output list is returned on success, an error
539  * code reflecting the error condition is returned otherwise.
540  */
541 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
542 			   int (*preproc)(struct acpi_resource *, void *),
543 			   void *preproc_data)
544 {
545 	struct res_proc_context c;
546 	acpi_status status;
547 
548 	if (!adev || !adev->handle || !list_empty(list))
549 		return -EINVAL;
550 
551 	if (!acpi_has_method(adev->handle, METHOD_NAME__CRS))
552 		return 0;
553 
554 	c.list = list;
555 	c.preproc = preproc;
556 	c.preproc_data = preproc_data;
557 	c.count = 0;
558 	c.error = 0;
559 	status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
560 				     acpi_dev_process_resource, &c);
561 	if (ACPI_FAILURE(status)) {
562 		acpi_dev_free_resource_list(list);
563 		return c.error ? c.error : -EIO;
564 	}
565 
566 	return c.count;
567 }
568 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
569 
570 /**
571  * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
572  *				   types
573  * @ares: Input ACPI resource object.
574  * @types: Valid resource types of IORESOURCE_XXX
575  *
576  * This is a hepler function to support acpi_dev_get_resources(), which filters
577  * ACPI resource objects according to resource types.
578  */
579 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
580 				  unsigned long types)
581 {
582 	unsigned long type = 0;
583 
584 	switch (ares->type) {
585 	case ACPI_RESOURCE_TYPE_MEMORY24:
586 	case ACPI_RESOURCE_TYPE_MEMORY32:
587 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
588 		type = IORESOURCE_MEM;
589 		break;
590 	case ACPI_RESOURCE_TYPE_IO:
591 	case ACPI_RESOURCE_TYPE_FIXED_IO:
592 		type = IORESOURCE_IO;
593 		break;
594 	case ACPI_RESOURCE_TYPE_IRQ:
595 	case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
596 		type = IORESOURCE_IRQ;
597 		break;
598 	case ACPI_RESOURCE_TYPE_DMA:
599 	case ACPI_RESOURCE_TYPE_FIXED_DMA:
600 		type = IORESOURCE_DMA;
601 		break;
602 	case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
603 		type = IORESOURCE_REG;
604 		break;
605 	case ACPI_RESOURCE_TYPE_ADDRESS16:
606 	case ACPI_RESOURCE_TYPE_ADDRESS32:
607 	case ACPI_RESOURCE_TYPE_ADDRESS64:
608 	case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
609 		if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
610 			type = IORESOURCE_MEM;
611 		else if (ares->data.address.resource_type == ACPI_IO_RANGE)
612 			type = IORESOURCE_IO;
613 		else if (ares->data.address.resource_type ==
614 			 ACPI_BUS_NUMBER_RANGE)
615 			type = IORESOURCE_BUS;
616 		break;
617 	default:
618 		break;
619 	}
620 
621 	return (type & types) ? 0 : 1;
622 }
623 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);
624