Merge tag 'for-linus' of git://github.com/dledford/linux
[firefly-linux-kernel-4.4.55.git] / drivers / acpi / resource.c
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);