forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathirqdomain.c
1797 lines (1551 loc) · 49.1 KB
/
irqdomain.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) "irq: " fmt
#include <linux/acpi.h>
#include <linux/debugfs.h>
#include <linux/hardirq.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/topology.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/fs.h>
static LIST_HEAD(irq_domain_list);
static DEFINE_MUTEX(irq_domain_mutex);
static struct irq_domain *irq_default_domain;
static void irq_domain_check_hierarchy(struct irq_domain *domain);
struct irqchip_fwid {
struct fwnode_handle fwnode;
unsigned int type;
char *name;
void *data;
};
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
static void debugfs_add_domain_dir(struct irq_domain *d);
static void debugfs_remove_domain_dir(struct irq_domain *d);
#else
static inline void debugfs_add_domain_dir(struct irq_domain *d) { }
static inline void debugfs_remove_domain_dir(struct irq_domain *d) { }
#endif
const struct fwnode_operations irqchip_fwnode_ops;
EXPORT_SYMBOL_GPL(irqchip_fwnode_ops);
/**
* irq_domain_alloc_fwnode - Allocate a fwnode_handle suitable for
* identifying an irq domain
* @type: Type of irqchip_fwnode. See linux/irqdomain.h
* @name: Optional user provided domain name
* @id: Optional user provided id if name != NULL
* @data: Optional user-provided data
*
* Allocate a struct irqchip_fwid, and return a poiner to the embedded
* fwnode_handle (or NULL on failure).
*
* Note: The types IRQCHIP_FWNODE_NAMED and IRQCHIP_FWNODE_NAMED_ID are
* solely to transport name information to irqdomain creation code. The
* node is not stored. For other types the pointer is kept in the irq
* domain struct.
*/
struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
const char *name, void *data)
{
struct irqchip_fwid *fwid;
char *n;
fwid = kzalloc(sizeof(*fwid), GFP_KERNEL);
switch (type) {
case IRQCHIP_FWNODE_NAMED:
n = kasprintf(GFP_KERNEL, "%s", name);
break;
case IRQCHIP_FWNODE_NAMED_ID:
n = kasprintf(GFP_KERNEL, "%s-%d", name, id);
break;
default:
n = kasprintf(GFP_KERNEL, "irqchip@%p", data);
break;
}
if (!fwid || !n) {
kfree(fwid);
kfree(n);
return NULL;
}
fwid->type = type;
fwid->name = n;
fwid->data = data;
fwid->fwnode.ops = &irqchip_fwnode_ops;
return &fwid->fwnode;
}
EXPORT_SYMBOL_GPL(__irq_domain_alloc_fwnode);
/**
* irq_domain_free_fwnode - Free a non-OF-backed fwnode_handle
*
* Free a fwnode_handle allocated with irq_domain_alloc_fwnode.
*/
void irq_domain_free_fwnode(struct fwnode_handle *fwnode)
{
struct irqchip_fwid *fwid;
if (WARN_ON(!is_fwnode_irqchip(fwnode)))
return;
fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
kfree(fwid->name);
kfree(fwid);
}
EXPORT_SYMBOL_GPL(irq_domain_free_fwnode);
/**
* __irq_domain_add() - Allocate a new irq_domain data structure
* @fwnode: firmware node for the interrupt controller
* @size: Size of linear map; 0 for radix mapping only
* @hwirq_max: Maximum number of interrupts supported by controller
* @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
* direct mapping
* @ops: domain callbacks
* @host_data: Controller private data pointer
*
* Allocates and initialize and irq_domain structure.
* Returns pointer to IRQ domain, or NULL on failure.
*/
struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
irq_hw_number_t hwirq_max, int direct_max,
const struct irq_domain_ops *ops,
void *host_data)
{
struct device_node *of_node = to_of_node(fwnode);
struct irqchip_fwid *fwid;
struct irq_domain *domain;
static atomic_t unknown_domains;
domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
GFP_KERNEL, of_node_to_nid(of_node));
if (WARN_ON(!domain))
return NULL;
if (fwnode && is_fwnode_irqchip(fwnode)) {
fwid = container_of(fwnode, struct irqchip_fwid, fwnode);
switch (fwid->type) {
case IRQCHIP_FWNODE_NAMED:
case IRQCHIP_FWNODE_NAMED_ID:
domain->name = kstrdup(fwid->name, GFP_KERNEL);
if (!domain->name) {
kfree(domain);
return NULL;
}
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
break;
default:
domain->fwnode = fwnode;
domain->name = fwid->name;
break;
}
#ifdef CONFIG_ACPI
} else if (is_acpi_device_node(fwnode)) {
struct acpi_buffer buf = {
.length = ACPI_ALLOCATE_BUFFER,
};
acpi_handle handle;
handle = acpi_device_handle(to_acpi_device_node(fwnode));
if (acpi_get_name(handle, ACPI_FULL_PATHNAME, &buf) == AE_OK) {
domain->name = buf.pointer;
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
}
domain->fwnode = fwnode;
#endif
} else if (of_node) {
char *name;
/*
* DT paths contain '/', which debugfs is legitimately
* unhappy about. Replace them with ':', which does
* the trick and is not as offensive as '\'...
*/
name = kasprintf(GFP_KERNEL, "%pOF", of_node);
if (!name) {
kfree(domain);
return NULL;
}
strreplace(name, '/', ':');
domain->name = name;
domain->fwnode = fwnode;
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
}
if (!domain->name) {
if (fwnode)
pr_err("Invalid fwnode type for irqdomain\n");
domain->name = kasprintf(GFP_KERNEL, "unknown-%d",
atomic_inc_return(&unknown_domains));
if (!domain->name) {
kfree(domain);
return NULL;
}
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
}
of_node_get(of_node);
/* Fill structure */
INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
mutex_init(&domain->revmap_tree_mutex);
domain->ops = ops;
domain->host_data = host_data;
domain->hwirq_max = hwirq_max;
domain->revmap_size = size;
domain->revmap_direct_max_irq = direct_max;
irq_domain_check_hierarchy(domain);
mutex_lock(&irq_domain_mutex);
debugfs_add_domain_dir(domain);
list_add(&domain->link, &irq_domain_list);
mutex_unlock(&irq_domain_mutex);
pr_debug("Added domain %s\n", domain->name);
return domain;
}
EXPORT_SYMBOL_GPL(__irq_domain_add);
/**
* irq_domain_remove() - Remove an irq domain.
* @domain: domain to remove
*
* This routine is used to remove an irq domain. The caller must ensure
* that all mappings within the domain have been disposed of prior to
* use, depending on the revmap type.
*/
void irq_domain_remove(struct irq_domain *domain)
{
mutex_lock(&irq_domain_mutex);
debugfs_remove_domain_dir(domain);
WARN_ON(!radix_tree_empty(&domain->revmap_tree));
list_del(&domain->link);
/*
* If the going away domain is the default one, reset it.
*/
if (unlikely(irq_default_domain == domain))
irq_set_default_host(NULL);
mutex_unlock(&irq_domain_mutex);
pr_debug("Removed domain %s\n", domain->name);
of_node_put(irq_domain_get_of_node(domain));
if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
kfree(domain->name);
kfree(domain);
}
EXPORT_SYMBOL_GPL(irq_domain_remove);
void irq_domain_update_bus_token(struct irq_domain *domain,
enum irq_domain_bus_token bus_token)
{
char *name;
if (domain->bus_token == bus_token)
return;
mutex_lock(&irq_domain_mutex);
domain->bus_token = bus_token;
name = kasprintf(GFP_KERNEL, "%s-%d", domain->name, bus_token);
if (!name) {
mutex_unlock(&irq_domain_mutex);
return;
}
debugfs_remove_domain_dir(domain);
if (domain->flags & IRQ_DOMAIN_NAME_ALLOCATED)
kfree(domain->name);
else
domain->flags |= IRQ_DOMAIN_NAME_ALLOCATED;
domain->name = name;
debugfs_add_domain_dir(domain);
mutex_unlock(&irq_domain_mutex);
}
/**
* irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in mapping
* @first_irq: first number of irq block assigned to the domain,
* pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
* pre-map all of the irqs in the domain to virqs starting at first_irq.
* @ops: domain callbacks
* @host_data: Controller private data pointer
*
* Allocates an irq_domain, and optionally if first_irq is positive then also
* allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
*
* This is intended to implement the expected behaviour for most
* interrupt controllers. If device tree is used, then first_irq will be 0 and
* irqs get mapped dynamically on the fly. However, if the controller requires
* static virq assignments (non-DT boot) then it will set that up correctly.
*/
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;
domain = __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
if (!domain)
return NULL;
if (first_irq > 0) {
if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
/* attempt to allocated irq_descs */
int rc = irq_alloc_descs(first_irq, first_irq, size,
of_node_to_nid(of_node));
if (rc < 0)
pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
first_irq);
}
irq_domain_associate_many(domain, first_irq, 0, size);
}
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_simple);
/**
* irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
* @of_node: pointer to interrupt controller's device tree node.
* @size: total number of irqs in legacy mapping
* @first_irq: first number of irq block assigned to the domain
* @first_hwirq: first hwirq number to use for the translation. Should normally
* be '0', but a positive integer can be used if the effective
* hwirqs numbering does not begin at zero.
* @ops: map/unmap domain callbacks
* @host_data: Controller private data pointer
*
* Note: the map() callback will be called before this function returns
* for all legacy interrupts except 0 (which is always the invalid irq for
* a legacy controller).
*/
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
unsigned int size,
unsigned int first_irq,
irq_hw_number_t first_hwirq,
const struct irq_domain_ops *ops,
void *host_data)
{
struct irq_domain *domain;
domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
first_hwirq + size, 0, ops, host_data);
if (domain)
irq_domain_associate_many(domain, first_irq, first_hwirq, size);
return domain;
}
EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
/**
* irq_find_matching_fwspec() - Locates a domain for a given fwspec
* @fwspec: FW specifier for an interrupt
* @bus_token: domain-specific data
*/
struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
enum irq_domain_bus_token bus_token)
{
struct irq_domain *h, *found = NULL;
struct fwnode_handle *fwnode = fwspec->fwnode;
int rc;
/* We might want to match the legacy controller last since
* it might potentially be set to match all interrupts in
* the absence of a device node. This isn't a problem so far
* yet though...
*
* bus_token == DOMAIN_BUS_ANY matches any domain, any other
* values must generate an exact match for the domain to be
* selected.
*/
mutex_lock(&irq_domain_mutex);
list_for_each_entry(h, &irq_domain_list, link) {
if (h->ops->select && fwspec->param_count)
rc = h->ops->select(h, fwspec, bus_token);
else if (h->ops->match)
rc = h->ops->match(h, to_of_node(fwnode), bus_token);
else
rc = ((fwnode != NULL) && (h->fwnode == fwnode) &&
((bus_token == DOMAIN_BUS_ANY) ||
(h->bus_token == bus_token)));
if (rc) {
found = h;
break;
}
}
mutex_unlock(&irq_domain_mutex);
return found;
}
EXPORT_SYMBOL_GPL(irq_find_matching_fwspec);
/**
* irq_domain_check_msi_remap - Check whether all MSI irq domains implement
* IRQ remapping
*
* Return: false if any MSI irq domain does not support IRQ remapping,
* true otherwise (including if there is no MSI irq domain)
*/
bool irq_domain_check_msi_remap(void)
{
struct irq_domain *h;
bool ret = true;
mutex_lock(&irq_domain_mutex);
list_for_each_entry(h, &irq_domain_list, link) {
if (irq_domain_is_msi(h) &&
!irq_domain_hierarchical_is_msi_remap(h)) {
ret = false;
break;
}
}
mutex_unlock(&irq_domain_mutex);
return ret;
}
EXPORT_SYMBOL_GPL(irq_domain_check_msi_remap);
/**
* irq_set_default_host() - Set a "default" irq domain
* @domain: default domain pointer
*
* For convenience, it's possible to set a "default" domain that will be used
* whenever NULL is passed to irq_create_mapping(). It makes life easier for
* platforms that want to manipulate a few hard coded interrupt numbers that
* aren't properly represented in the device-tree.
*/
void irq_set_default_host(struct irq_domain *domain)
{
pr_debug("Default domain set to @0x%p\n", domain);
irq_default_domain = domain;
}
EXPORT_SYMBOL_GPL(irq_set_default_host);
/**
* irq_get_default_host() - Retrieve the "default" irq domain
*
* Returns: the default domain, if any.
*
* Modern code should never use this. This should only be used on
* systems that cannot implement a firmware->fwnode mapping (which
* both DT and ACPI provide).
*/
struct irq_domain *irq_get_default_host(void)
{
return irq_default_domain;
}
static void irq_domain_clear_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
if (hwirq < domain->revmap_size) {
domain->linear_revmap[hwirq] = 0;
} else {
mutex_lock(&domain->revmap_tree_mutex);
radix_tree_delete(&domain->revmap_tree, hwirq);
mutex_unlock(&domain->revmap_tree_mutex);
}
}
static void irq_domain_set_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq,
struct irq_data *irq_data)
{
if (hwirq < domain->revmap_size) {
domain->linear_revmap[hwirq] = irq_data->irq;
} else {
mutex_lock(&domain->revmap_tree_mutex);
radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
mutex_unlock(&domain->revmap_tree_mutex);
}
}
void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
{
struct irq_data *irq_data = irq_get_irq_data(irq);
irq_hw_number_t hwirq;
if (WARN(!irq_data || irq_data->domain != domain,
"virq%i doesn't exist; cannot disassociate\n", irq))
return;
hwirq = irq_data->hwirq;
irq_set_status_flags(irq, IRQ_NOREQUEST);
/* remove chip and handler */
irq_set_chip_and_handler(irq, NULL, NULL);
/* Make sure it's completed */
synchronize_irq(irq);
/* Tell the PIC about it */
if (domain->ops->unmap)
domain->ops->unmap(domain, irq);
smp_mb();
irq_data->domain = NULL;
irq_data->hwirq = 0;
domain->mapcount--;
/* Clear reverse map for this hwirq */
irq_domain_clear_mapping(domain, hwirq);
}
int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
irq_hw_number_t hwirq)
{
struct irq_data *irq_data = irq_get_irq_data(virq);
int ret;
if (WARN(hwirq >= domain->hwirq_max,
"error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
return -EINVAL;
if (WARN(!irq_data, "error: virq%i is not allocated", virq))
return -EINVAL;
if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
return -EINVAL;
mutex_lock(&irq_domain_mutex);
irq_data->hwirq = hwirq;
irq_data->domain = domain;
if (domain->ops->map) {
ret = domain->ops->map(domain, virq, hwirq);
if (ret != 0) {
/*
* If map() returns -EPERM, this interrupt is protected
* by the firmware or some other service and shall not
* be mapped. Don't bother telling the user about it.
*/
if (ret != -EPERM) {
pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
domain->name, hwirq, virq, ret);
}
irq_data->domain = NULL;
irq_data->hwirq = 0;
mutex_unlock(&irq_domain_mutex);
return ret;
}
/* If not already assigned, give the domain the chip's name */
if (!domain->name && irq_data->chip)
domain->name = irq_data->chip->name;
}
domain->mapcount++;
irq_domain_set_mapping(domain, hwirq, irq_data);
mutex_unlock(&irq_domain_mutex);
irq_clear_status_flags(virq, IRQ_NOREQUEST);
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_associate);
void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
irq_hw_number_t hwirq_base, int count)
{
struct device_node *of_node;
int i;
of_node = irq_domain_get_of_node(domain);
pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
of_node_full_name(of_node), irq_base, (int)hwirq_base, count);
for (i = 0; i < count; i++) {
irq_domain_associate(domain, irq_base + i, hwirq_base + i);
}
}
EXPORT_SYMBOL_GPL(irq_domain_associate_many);
/**
* irq_create_direct_mapping() - Allocate an irq for direct mapping
* @domain: domain to allocate the irq for or NULL for default domain
*
* This routine is used for irq controllers which can choose the hardware
* interrupt numbers they generate. In such a case it's simplest to use
* the linux irq as the hardware interrupt number. It still uses the linear
* or radix tree to store the mapping, but the irq controller can optimize
* the revmap path by using the hwirq directly.
*/
unsigned int irq_create_direct_mapping(struct irq_domain *domain)
{
struct device_node *of_node;
unsigned int virq;
if (domain == NULL)
domain = irq_default_domain;
of_node = irq_domain_get_of_node(domain);
virq = irq_alloc_desc_from(1, of_node_to_nid(of_node));
if (!virq) {
pr_debug("create_direct virq allocation failed\n");
return 0;
}
if (virq >= domain->revmap_direct_max_irq) {
pr_err("ERROR: no free irqs available below %i maximum\n",
domain->revmap_direct_max_irq);
irq_free_desc(virq);
return 0;
}
pr_debug("create_direct obtained virq %d\n", virq);
if (irq_domain_associate(domain, virq, virq)) {
irq_free_desc(virq);
return 0;
}
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
/**
* irq_create_mapping() - Map a hardware interrupt into linux irq space
* @domain: domain owning this hardware interrupt or NULL for default domain
* @hwirq: hardware irq number in that domain space
*
* Only one mapping per hardware interrupt is permitted. Returns a linux
* irq number.
* If the sense/trigger is to be specified, set_irq_type() should be called
* on the number returned from that call.
*/
unsigned int irq_create_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
struct device_node *of_node;
int virq;
pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
/* Look for default domain if nececssary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL) {
WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
return 0;
}
pr_debug("-> using domain @%p\n", domain);
of_node = irq_domain_get_of_node(domain);
/* Check if mapping already exists */
virq = irq_find_mapping(domain, hwirq);
if (virq) {
pr_debug("-> existing mapping on virq %d\n", virq);
return virq;
}
/* Allocate a virtual interrupt number */
virq = irq_domain_alloc_descs(-1, 1, hwirq, of_node_to_nid(of_node), NULL);
if (virq <= 0) {
pr_debug("-> virq allocation failed\n");
return 0;
}
if (irq_domain_associate(domain, virq, hwirq)) {
irq_free_desc(virq);
return 0;
}
pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
hwirq, of_node_full_name(of_node), virq);
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_mapping);
/**
* irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
* @domain: domain owning the interrupt range
* @irq_base: beginning of linux IRQ range
* @hwirq_base: beginning of hardware IRQ range
* @count: Number of interrupts to map
*
* This routine is used for allocating and mapping a range of hardware
* irqs to linux irqs where the linux irq numbers are at pre-defined
* locations. For use by controllers that already have static mappings
* to insert in to the domain.
*
* Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
* domain insertion.
*
* 0 is returned upon success, while any failure to establish a static
* mapping is treated as an error.
*/
int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
irq_hw_number_t hwirq_base, int count)
{
struct device_node *of_node;
int ret;
of_node = irq_domain_get_of_node(domain);
ret = irq_alloc_descs(irq_base, irq_base, count,
of_node_to_nid(of_node));
if (unlikely(ret < 0))
return ret;
irq_domain_associate_many(domain, irq_base, hwirq_base, count);
return 0;
}
EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
static int irq_domain_translate(struct irq_domain *d,
struct irq_fwspec *fwspec,
irq_hw_number_t *hwirq, unsigned int *type)
{
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
if (d->ops->translate)
return d->ops->translate(d, fwspec, hwirq, type);
#endif
if (d->ops->xlate)
return d->ops->xlate(d, to_of_node(fwspec->fwnode),
fwspec->param, fwspec->param_count,
hwirq, type);
/* If domain has no translation, then we assume interrupt line */
*hwirq = fwspec->param[0];
return 0;
}
static void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
unsigned int count,
struct irq_fwspec *fwspec)
{
int i;
fwspec->fwnode = np ? &np->fwnode : NULL;
fwspec->param_count = count;
for (i = 0; i < count; i++)
fwspec->param[i] = args[i];
}
unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
{
struct irq_domain *domain;
struct irq_data *irq_data;
irq_hw_number_t hwirq;
unsigned int type = IRQ_TYPE_NONE;
int virq;
if (fwspec->fwnode) {
domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_WIRED);
if (!domain)
domain = irq_find_matching_fwspec(fwspec, DOMAIN_BUS_ANY);
} else {
domain = irq_default_domain;
}
if (!domain) {
pr_warn("no irq domain found for %s !\n",
of_node_full_name(to_of_node(fwspec->fwnode)));
return 0;
}
if (irq_domain_translate(domain, fwspec, &hwirq, &type))
return 0;
/*
* WARN if the irqchip returns a type with bits
* outside the sense mask set and clear these bits.
*/
if (WARN_ON(type & ~IRQ_TYPE_SENSE_MASK))
type &= IRQ_TYPE_SENSE_MASK;
/*
* If we've already configured this interrupt,
* don't do it again, or hell will break loose.
*/
virq = irq_find_mapping(domain, hwirq);
if (virq) {
/*
* If the trigger type is not specified or matches the
* current trigger type then we are done so return the
* interrupt number.
*/
if (type == IRQ_TYPE_NONE || type == irq_get_trigger_type(virq))
return virq;
/*
* If the trigger type has not been set yet, then set
* it now and return the interrupt number.
*/
if (irq_get_trigger_type(virq) == IRQ_TYPE_NONE) {
irq_data = irq_get_irq_data(virq);
if (!irq_data)
return 0;
irqd_set_trigger_type(irq_data, type);
return virq;
}
pr_warn("type mismatch, failed to map hwirq-%lu for %s!\n",
hwirq, of_node_full_name(to_of_node(fwspec->fwnode)));
return 0;
}
if (irq_domain_is_hierarchy(domain)) {
virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, fwspec);
if (virq <= 0)
return 0;
} else {
/* Create mapping */
virq = irq_create_mapping(domain, hwirq);
if (!virq)
return virq;
}
irq_data = irq_get_irq_data(virq);
if (!irq_data) {
if (irq_domain_is_hierarchy(domain))
irq_domain_free_irqs(virq, 1);
else
irq_dispose_mapping(virq);
return 0;
}
/* Store trigger type */
irqd_set_trigger_type(irq_data, type);
return virq;
}
EXPORT_SYMBOL_GPL(irq_create_fwspec_mapping);
unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
{
struct irq_fwspec fwspec;
of_phandle_args_to_fwspec(irq_data->np, irq_data->args,
irq_data->args_count, &fwspec);
return irq_create_fwspec_mapping(&fwspec);
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);
/**
* irq_dispose_mapping() - Unmap an interrupt
* @virq: linux irq number of the interrupt to unmap
*/
void irq_dispose_mapping(unsigned int virq)
{
struct irq_data *irq_data = irq_get_irq_data(virq);
struct irq_domain *domain;
if (!virq || !irq_data)
return;
domain = irq_data->domain;
if (WARN_ON(domain == NULL))
return;
if (irq_domain_is_hierarchy(domain)) {
irq_domain_free_irqs(virq, 1);
} else {
irq_domain_disassociate(domain, virq);
irq_free_desc(virq);
}
}
EXPORT_SYMBOL_GPL(irq_dispose_mapping);
/**
* irq_find_mapping() - Find a linux irq from a hw irq number.
* @domain: domain owning this hardware interrupt
* @hwirq: hardware irq number in that domain space
*/
unsigned int irq_find_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
struct irq_data *data;
/* Look for default domain if nececssary */
if (domain == NULL)
domain = irq_default_domain;
if (domain == NULL)
return 0;
if (hwirq < domain->revmap_direct_max_irq) {
data = irq_domain_get_irq_data(domain, hwirq);
if (data && data->hwirq == hwirq)
return hwirq;
}
/* Check if the hwirq is in the linear revmap. */
if (hwirq < domain->revmap_size)
return domain->linear_revmap[hwirq];
rcu_read_lock();
data = radix_tree_lookup(&domain->revmap_tree, hwirq);
rcu_read_unlock();
return data ? data->irq : 0;
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
/**
* irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
*
* Device Tree IRQ specifier translation function which works with one cell
* bindings where the cell value maps directly to the hwirq number.
*/
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type)
{
if (WARN_ON(intsize < 1))
return -EINVAL;
*out_hwirq = intspec[0];
*out_type = IRQ_TYPE_NONE;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
/**
* irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
*
* Device Tree IRQ specifier translation function which works with two cell
* bindings where the cell values map directly to the hwirq number
* and linux irq flags.
*/
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
irq_hw_number_t *out_hwirq, unsigned int *out_type)
{
struct irq_fwspec fwspec;
of_phandle_args_to_fwspec(ctrlr, intspec, intsize, &fwspec);
return irq_domain_translate_twocell(d, &fwspec, out_hwirq, out_type);
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
/**
* irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
*
* Device Tree IRQ specifier translation function which works with either one
* or two cell bindings where the cell values map directly to the hwirq number
* and linux irq flags.
*
* Note: don't use this function unless your interrupt controller explicitly
* supports both one and two cell bindings. For the majority of controllers
* the _onecell() or _twocell() variants above should be used.
*/
int irq_domain_xlate_onetwocell(struct irq_domain *d,
struct device_node *ctrlr,
const u32 *intspec, unsigned int intsize,
unsigned long *out_hwirq, unsigned int *out_type)
{
if (WARN_ON(intsize < 1))
return -EINVAL;
*out_hwirq = intspec[0];
if (intsize > 1)
*out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
else
*out_type = IRQ_TYPE_NONE;
return 0;
}
EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
const struct irq_domain_ops irq_domain_simple_ops = {
.xlate = irq_domain_xlate_onetwocell,
};
EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
/**
* irq_domain_translate_twocell() - Generic translate for direct two cell
* bindings
*
* Device Tree IRQ specifier translation function which works with two cell
* bindings where the cell values map directly to the hwirq number
* and linux irq flags.
*/
int irq_domain_translate_twocell(struct irq_domain *d,
struct irq_fwspec *fwspec,
unsigned long *out_hwirq,
unsigned int *out_type)
{
if (WARN_ON(fwspec->param_count < 2))