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1#define pr_fmt(fmt) "irq: " fmt
2
3#include <linux/debugfs.h>
4#include <linux/hardirq.h>
5#include <linux/interrupt.h>
6#include <linux/irq.h>
7#include <linux/irqdesc.h>
8#include <linux/irqdomain.h>
9#include <linux/module.h>
10#include <linux/mutex.h>
11#include <linux/of.h>
12#include <linux/of_address.h>
13#include <linux/of_irq.h>
14#include <linux/topology.h>
15#include <linux/seq_file.h>
16#include <linux/slab.h>
17#include <linux/smp.h>
18#include <linux/fs.h>
19
20static LIST_HEAD(irq_domain_list);
21static DEFINE_MUTEX(irq_domain_mutex);
22
23static DEFINE_MUTEX(revmap_trees_mutex);
24static struct irq_domain *irq_default_domain;
25
26/**
27 * __irq_domain_add() - Allocate a new irq_domain data structure
28 * @of_node: optional device-tree node of the interrupt controller
29 * @size: Size of linear map; 0 for radix mapping only
30 * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no
31 * direct mapping
32 * @ops: map/unmap domain callbacks
33 * @host_data: Controller private data pointer
34 *
35 * Allocates and initialize and irq_domain structure. Caller is expected to
36 * register allocated irq_domain with irq_domain_register(). Returns pointer
37 * to IRQ domain, or NULL on failure.
38 */
39struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
40 irq_hw_number_t hwirq_max, int direct_max,
41 const struct irq_domain_ops *ops,
42 void *host_data)
43{
44 struct irq_domain *domain;
45
46 domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
47 GFP_KERNEL, of_node_to_nid(of_node));
48 if (WARN_ON(!domain))
49 return NULL;
50
51 /* Fill structure */
52 INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL);
53 domain->ops = ops;
54 domain->host_data = host_data;
55 domain->of_node = of_node_get(of_node);
56 domain->hwirq_max = hwirq_max;
57 domain->revmap_size = size;
58 domain->revmap_direct_max_irq = direct_max;
59
60 mutex_lock(&irq_domain_mutex);
61 list_add(&domain->link, &irq_domain_list);
62 mutex_unlock(&irq_domain_mutex);
63
64 pr_debug("Added domain %s\n", domain->name);
65 return domain;
66}
67EXPORT_SYMBOL_GPL(__irq_domain_add);
68
69/**
70 * irq_domain_remove() - Remove an irq domain.
71 * @domain: domain to remove
72 *
73 * This routine is used to remove an irq domain. The caller must ensure
74 * that all mappings within the domain have been disposed of prior to
75 * use, depending on the revmap type.
76 */
77void irq_domain_remove(struct irq_domain *domain)
78{
79 mutex_lock(&irq_domain_mutex);
80
81 /*
82 * radix_tree_delete() takes care of destroying the root
83 * node when all entries are removed. Shout if there are
84 * any mappings left.
85 */
86 WARN_ON(domain->revmap_tree.height);
87
88 list_del(&domain->link);
89
90 /*
91 * If the going away domain is the default one, reset it.
92 */
93 if (unlikely(irq_default_domain == domain))
94 irq_set_default_host(NULL);
95
96 mutex_unlock(&irq_domain_mutex);
97
98 pr_debug("Removed domain %s\n", domain->name);
99
100 of_node_put(domain->of_node);
101 kfree(domain);
102}
103EXPORT_SYMBOL_GPL(irq_domain_remove);
104
105/**
106 * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs
107 * @of_node: pointer to interrupt controller's device tree node.
108 * @size: total number of irqs in mapping
109 * @first_irq: first number of irq block assigned to the domain,
110 * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then
111 * pre-map all of the irqs in the domain to virqs starting at first_irq.
112 * @ops: map/unmap domain callbacks
113 * @host_data: Controller private data pointer
114 *
115 * Allocates an irq_domain, and optionally if first_irq is positive then also
116 * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq.
117 *
118 * This is intended to implement the expected behaviour for most
119 * interrupt controllers. If device tree is used, then first_irq will be 0 and
120 * irqs get mapped dynamically on the fly. However, if the controller requires
121 * static virq assignments (non-DT boot) then it will set that up correctly.
122 */
123struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
124 unsigned int size,
125 unsigned int first_irq,
126 const struct irq_domain_ops *ops,
127 void *host_data)
128{
129 struct irq_domain *domain;
130
131 domain = __irq_domain_add(of_node, size, size, 0, ops, host_data);
132 if (!domain)
133 return NULL;
134
135 if (first_irq > 0) {
136 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
137 /* attempt to allocated irq_descs */
138 int rc = irq_alloc_descs(first_irq, first_irq, size,
139 of_node_to_nid(of_node));
140 if (rc < 0)
141 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
142 first_irq);
143 }
144 irq_domain_associate_many(domain, first_irq, 0, size);
145 }
146
147 return domain;
148}
149EXPORT_SYMBOL_GPL(irq_domain_add_simple);
150
151/**
152 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
153 * @of_node: pointer to interrupt controller's device tree node.
154 * @size: total number of irqs in legacy mapping
155 * @first_irq: first number of irq block assigned to the domain
156 * @first_hwirq: first hwirq number to use for the translation. Should normally
157 * be '0', but a positive integer can be used if the effective
158 * hwirqs numbering does not begin at zero.
159 * @ops: map/unmap domain callbacks
160 * @host_data: Controller private data pointer
161 *
162 * Note: the map() callback will be called before this function returns
163 * for all legacy interrupts except 0 (which is always the invalid irq for
164 * a legacy controller).
165 */
166struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
167 unsigned int size,
168 unsigned int first_irq,
169 irq_hw_number_t first_hwirq,
170 const struct irq_domain_ops *ops,
171 void *host_data)
172{
173 struct irq_domain *domain;
174
175 domain = __irq_domain_add(of_node, first_hwirq + size,
176 first_hwirq + size, 0, ops, host_data);
177 if (!domain)
178 return NULL;
179
180 irq_domain_associate_many(domain, first_irq, first_hwirq, size);
181
182 return domain;
183}
184EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
185
186/**
187 * irq_find_host() - Locates a domain for a given device node
188 * @node: device-tree node of the interrupt controller
189 */
190struct irq_domain *irq_find_host(struct device_node *node)
191{
192 struct irq_domain *h, *found = NULL;
193 int rc;
194
195 /* We might want to match the legacy controller last since
196 * it might potentially be set to match all interrupts in
197 * the absence of a device node. This isn't a problem so far
198 * yet though...
199 */
200 mutex_lock(&irq_domain_mutex);
201 list_for_each_entry(h, &irq_domain_list, link) {
202 if (h->ops->match)
203 rc = h->ops->match(h, node);
204 else
205 rc = (h->of_node != NULL) && (h->of_node == node);
206
207 if (rc) {
208 found = h;
209 break;
210 }
211 }
212 mutex_unlock(&irq_domain_mutex);
213 return found;
214}
215EXPORT_SYMBOL_GPL(irq_find_host);
216
217/**
218 * irq_set_default_host() - Set a "default" irq domain
219 * @domain: default domain pointer
220 *
221 * For convenience, it's possible to set a "default" domain that will be used
222 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
223 * platforms that want to manipulate a few hard coded interrupt numbers that
224 * aren't properly represented in the device-tree.
225 */
226void irq_set_default_host(struct irq_domain *domain)
227{
228 pr_debug("Default domain set to @0x%p\n", domain);
229
230 irq_default_domain = domain;
231}
232EXPORT_SYMBOL_GPL(irq_set_default_host);
233
234static void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq)
235{
236 struct irq_data *irq_data = irq_get_irq_data(irq);
237 irq_hw_number_t hwirq;
238
239 if (WARN(!irq_data || irq_data->domain != domain,
240 "virq%i doesn't exist; cannot disassociate\n", irq))
241 return;
242
243 hwirq = irq_data->hwirq;
244 irq_set_status_flags(irq, IRQ_NOREQUEST);
245
246 /* remove chip and handler */
247 irq_set_chip_and_handler(irq, NULL, NULL);
248
249 /* Make sure it's completed */
250 synchronize_irq(irq);
251
252 /* Tell the PIC about it */
253 if (domain->ops->unmap)
254 domain->ops->unmap(domain, irq);
255 smp_mb();
256
257 irq_data->domain = NULL;
258 irq_data->hwirq = 0;
259
260 /* Clear reverse map for this hwirq */
261 if (hwirq < domain->revmap_size) {
262 domain->linear_revmap[hwirq] = 0;
263 } else {
264 mutex_lock(&revmap_trees_mutex);
265 radix_tree_delete(&domain->revmap_tree, hwirq);
266 mutex_unlock(&revmap_trees_mutex);
267 }
268}
269
270int irq_domain_associate(struct irq_domain *domain, unsigned int virq,
271 irq_hw_number_t hwirq)
272{
273 struct irq_data *irq_data = irq_get_irq_data(virq);
274 int ret;
275
276 if (WARN(hwirq >= domain->hwirq_max,
277 "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name))
278 return -EINVAL;
279 if (WARN(!irq_data, "error: virq%i is not allocated", virq))
280 return -EINVAL;
281 if (WARN(irq_data->domain, "error: virq%i is already associated", virq))
282 return -EINVAL;
283
284 mutex_lock(&irq_domain_mutex);
285 irq_data->hwirq = hwirq;
286 irq_data->domain = domain;
287 if (domain->ops->map) {
288 ret = domain->ops->map(domain, virq, hwirq);
289 if (ret != 0) {
290 /*
291 * If map() returns -EPERM, this interrupt is protected
292 * by the firmware or some other service and shall not
293 * be mapped. Don't bother telling the user about it.
294 */
295 if (ret != -EPERM) {
296 pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n",
297 domain->name, hwirq, virq, ret);
298 }
299 irq_data->domain = NULL;
300 irq_data->hwirq = 0;
301 mutex_unlock(&irq_domain_mutex);
302 return ret;
303 }
304
305 /* If not already assigned, give the domain the chip's name */
306 if (!domain->name && irq_data->chip)
307 domain->name = irq_data->chip->name;
308 }
309
310 if (hwirq < domain->revmap_size) {
311 domain->linear_revmap[hwirq] = virq;
312 } else {
313 mutex_lock(&revmap_trees_mutex);
314 radix_tree_insert(&domain->revmap_tree, hwirq, irq_data);
315 mutex_unlock(&revmap_trees_mutex);
316 }
317 mutex_unlock(&irq_domain_mutex);
318
319 irq_clear_status_flags(virq, IRQ_NOREQUEST);
320
321 return 0;
322}
323EXPORT_SYMBOL_GPL(irq_domain_associate);
324
325void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
326 irq_hw_number_t hwirq_base, int count)
327{
328 int i;
329
330 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
331 of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
332
333 for (i = 0; i < count; i++) {
334 irq_domain_associate(domain, irq_base + i, hwirq_base + i);
335 }
336}
337EXPORT_SYMBOL_GPL(irq_domain_associate_many);
338
339/**
340 * irq_create_direct_mapping() - Allocate an irq for direct mapping
341 * @domain: domain to allocate the irq for or NULL for default domain
342 *
343 * This routine is used for irq controllers which can choose the hardware
344 * interrupt numbers they generate. In such a case it's simplest to use
345 * the linux irq as the hardware interrupt number. It still uses the linear
346 * or radix tree to store the mapping, but the irq controller can optimize
347 * the revmap path by using the hwirq directly.
348 */
349unsigned int irq_create_direct_mapping(struct irq_domain *domain)
350{
351 unsigned int virq;
352
353 if (domain == NULL)
354 domain = irq_default_domain;
355
356 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
357 if (!virq) {
358 pr_debug("create_direct virq allocation failed\n");
359 return 0;
360 }
361 if (virq >= domain->revmap_direct_max_irq) {
362 pr_err("ERROR: no free irqs available below %i maximum\n",
363 domain->revmap_direct_max_irq);
364 irq_free_desc(virq);
365 return 0;
366 }
367 pr_debug("create_direct obtained virq %d\n", virq);
368
369 if (irq_domain_associate(domain, virq, virq)) {
370 irq_free_desc(virq);
371 return 0;
372 }
373
374 return virq;
375}
376EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
377
378/**
379 * irq_create_mapping() - Map a hardware interrupt into linux irq space
380 * @domain: domain owning this hardware interrupt or NULL for default domain
381 * @hwirq: hardware irq number in that domain space
382 *
383 * Only one mapping per hardware interrupt is permitted. Returns a linux
384 * irq number.
385 * If the sense/trigger is to be specified, set_irq_type() should be called
386 * on the number returned from that call.
387 */
388unsigned int irq_create_mapping(struct irq_domain *domain,
389 irq_hw_number_t hwirq)
390{
391 unsigned int hint;
392 int virq;
393
394 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
395
396 /* Look for default domain if nececssary */
397 if (domain == NULL)
398 domain = irq_default_domain;
399 if (domain == NULL) {
400 WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq);
401 return 0;
402 }
403 pr_debug("-> using domain @%p\n", domain);
404
405 /* Check if mapping already exists */
406 virq = irq_find_mapping(domain, hwirq);
407 if (virq) {
408 pr_debug("-> existing mapping on virq %d\n", virq);
409 return virq;
410 }
411
412 /* Allocate a virtual interrupt number */
413 hint = hwirq % nr_irqs;
414 if (hint == 0)
415 hint++;
416 virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
417 if (virq <= 0)
418 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
419 if (virq <= 0) {
420 pr_debug("-> virq allocation failed\n");
421 return 0;
422 }
423
424 if (irq_domain_associate(domain, virq, hwirq)) {
425 irq_free_desc(virq);
426 return 0;
427 }
428
429 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
430 hwirq, of_node_full_name(domain->of_node), virq);
431
432 return virq;
433}
434EXPORT_SYMBOL_GPL(irq_create_mapping);
435
436/**
437 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
438 * @domain: domain owning the interrupt range
439 * @irq_base: beginning of linux IRQ range
440 * @hwirq_base: beginning of hardware IRQ range
441 * @count: Number of interrupts to map
442 *
443 * This routine is used for allocating and mapping a range of hardware
444 * irqs to linux irqs where the linux irq numbers are at pre-defined
445 * locations. For use by controllers that already have static mappings
446 * to insert in to the domain.
447 *
448 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
449 * domain insertion.
450 *
451 * 0 is returned upon success, while any failure to establish a static
452 * mapping is treated as an error.
453 */
454int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
455 irq_hw_number_t hwirq_base, int count)
456{
457 int ret;
458
459 ret = irq_alloc_descs(irq_base, irq_base, count,
460 of_node_to_nid(domain->of_node));
461 if (unlikely(ret < 0))
462 return ret;
463
464 irq_domain_associate_many(domain, irq_base, hwirq_base, count);
465 return 0;
466}
467EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
468
469unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
470{
471 struct irq_domain *domain;
472 irq_hw_number_t hwirq;
473 unsigned int type = IRQ_TYPE_NONE;
474 unsigned int virq;
475
476 domain = irq_data->np ? irq_find_host(irq_data->np) : irq_default_domain;
477 if (!domain) {
478 pr_warn("no irq domain found for %s !\n",
479 of_node_full_name(irq_data->np));
480 return 0;
481 }
482
483 /* If domain has no translation, then we assume interrupt line */
484 if (domain->ops->xlate == NULL)
485 hwirq = irq_data->args[0];
486 else {
487 if (domain->ops->xlate(domain, irq_data->np, irq_data->args,
488 irq_data->args_count, &hwirq, &type))
489 return 0;
490 }
491
492 /* Create mapping */
493 virq = irq_create_mapping(domain, hwirq);
494 if (!virq)
495 return virq;
496
497 /* Set type if specified and different than the current one */
498 if (type != IRQ_TYPE_NONE &&
499 type != irq_get_trigger_type(virq))
500 irq_set_irq_type(virq, type);
501 return virq;
502}
503EXPORT_SYMBOL_GPL(irq_create_of_mapping);
504
505/**
506 * irq_dispose_mapping() - Unmap an interrupt
507 * @virq: linux irq number of the interrupt to unmap
508 */
509void irq_dispose_mapping(unsigned int virq)
510{
511 struct irq_data *irq_data = irq_get_irq_data(virq);
512 struct irq_domain *domain;
513
514 if (!virq || !irq_data)
515 return;
516
517 domain = irq_data->domain;
518 if (WARN_ON(domain == NULL))
519 return;
520
521 irq_domain_disassociate(domain, virq);
522 irq_free_desc(virq);
523}
524EXPORT_SYMBOL_GPL(irq_dispose_mapping);
525
526/**
527 * irq_find_mapping() - Find a linux irq from an hw irq number.
528 * @domain: domain owning this hardware interrupt
529 * @hwirq: hardware irq number in that domain space
530 */
531unsigned int irq_find_mapping(struct irq_domain *domain,
532 irq_hw_number_t hwirq)
533{
534 struct irq_data *data;
535
536 /* Look for default domain if nececssary */
537 if (domain == NULL)
538 domain = irq_default_domain;
539 if (domain == NULL)
540 return 0;
541
542 if (hwirq < domain->revmap_direct_max_irq) {
543 data = irq_get_irq_data(hwirq);
544 if (data && (data->domain == domain) && (data->hwirq == hwirq))
545 return hwirq;
546 }
547
548 /* Check if the hwirq is in the linear revmap. */
549 if (hwirq < domain->revmap_size)
550 return domain->linear_revmap[hwirq];
551
552 rcu_read_lock();
553 data = radix_tree_lookup(&domain->revmap_tree, hwirq);
554 rcu_read_unlock();
555 return data ? data->irq : 0;
556}
557EXPORT_SYMBOL_GPL(irq_find_mapping);
558
559#ifdef CONFIG_IRQ_DOMAIN_DEBUG
560static int virq_debug_show(struct seq_file *m, void *private)
561{
562 unsigned long flags;
563 struct irq_desc *desc;
564 struct irq_domain *domain;
565 struct radix_tree_iter iter;
566 void *data, **slot;
567 int i;
568
569 seq_printf(m, " %-16s %-6s %-10s %-10s %s\n",
570 "name", "mapped", "linear-max", "direct-max", "devtree-node");
571 mutex_lock(&irq_domain_mutex);
572 list_for_each_entry(domain, &irq_domain_list, link) {
573 int count = 0;
574 radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0)
575 count++;
576 seq_printf(m, "%c%-16s %6u %10u %10u %s\n",
577 domain == irq_default_domain ? '*' : ' ', domain->name,
578 domain->revmap_size + count, domain->revmap_size,
579 domain->revmap_direct_max_irq,
580 domain->of_node ? of_node_full_name(domain->of_node) : "");
581 }
582 mutex_unlock(&irq_domain_mutex);
583
584 seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq",
585 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
586 "active", "type", "domain");
587
588 for (i = 1; i < nr_irqs; i++) {
589 desc = irq_to_desc(i);
590 if (!desc)
591 continue;
592
593 raw_spin_lock_irqsave(&desc->lock, flags);
594 domain = desc->irq_data.domain;
595
596 if (domain) {
597 struct irq_chip *chip;
598 int hwirq = desc->irq_data.hwirq;
599 bool direct;
600
601 seq_printf(m, "%5d ", i);
602 seq_printf(m, "0x%05x ", hwirq);
603
604 chip = irq_desc_get_chip(desc);
605 seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none");
606
607 data = irq_desc_get_chip_data(desc);
608 seq_printf(m, data ? "0x%p " : " %p ", data);
609
610 seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' ');
611 direct = (i == hwirq) && (i < domain->revmap_direct_max_irq);
612 seq_printf(m, "%6s%-8s ",
613 (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX",
614 direct ? "(DIRECT)" : "");
615 seq_printf(m, "%s\n", desc->irq_data.domain->name);
616 }
617
618 raw_spin_unlock_irqrestore(&desc->lock, flags);
619 }
620
621 return 0;
622}
623
624static int virq_debug_open(struct inode *inode, struct file *file)
625{
626 return single_open(file, virq_debug_show, inode->i_private);
627}
628
629static const struct file_operations virq_debug_fops = {
630 .open = virq_debug_open,
631 .read = seq_read,
632 .llseek = seq_lseek,
633 .release = single_release,
634};
635
636static int __init irq_debugfs_init(void)
637{
638 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
639 NULL, &virq_debug_fops) == NULL)
640 return -ENOMEM;
641
642 return 0;
643}
644__initcall(irq_debugfs_init);
645#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
646
647/**
648 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
649 *
650 * Device Tree IRQ specifier translation function which works with one cell
651 * bindings where the cell value maps directly to the hwirq number.
652 */
653int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
654 const u32 *intspec, unsigned int intsize,
655 unsigned long *out_hwirq, unsigned int *out_type)
656{
657 if (WARN_ON(intsize < 1))
658 return -EINVAL;
659 *out_hwirq = intspec[0];
660 *out_type = IRQ_TYPE_NONE;
661 return 0;
662}
663EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
664
665/**
666 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
667 *
668 * Device Tree IRQ specifier translation function which works with two cell
669 * bindings where the cell values map directly to the hwirq number
670 * and linux irq flags.
671 */
672int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
673 const u32 *intspec, unsigned int intsize,
674 irq_hw_number_t *out_hwirq, unsigned int *out_type)
675{
676 if (WARN_ON(intsize < 2))
677 return -EINVAL;
678 *out_hwirq = intspec[0];
679 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
680 return 0;
681}
682EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
683
684/**
685 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
686 *
687 * Device Tree IRQ specifier translation function which works with either one
688 * or two cell bindings where the cell values map directly to the hwirq number
689 * and linux irq flags.
690 *
691 * Note: don't use this function unless your interrupt controller explicitly
692 * supports both one and two cell bindings. For the majority of controllers
693 * the _onecell() or _twocell() variants above should be used.
694 */
695int irq_domain_xlate_onetwocell(struct irq_domain *d,
696 struct device_node *ctrlr,
697 const u32 *intspec, unsigned int intsize,
698 unsigned long *out_hwirq, unsigned int *out_type)
699{
700 if (WARN_ON(intsize < 1))
701 return -EINVAL;
702 *out_hwirq = intspec[0];
703 *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
704 return 0;
705}
706EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
707
708const struct irq_domain_ops irq_domain_simple_ops = {
709 .xlate = irq_domain_xlate_onetwocell,
710};
711EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
1#include <linux/irq.h>
2#include <linux/irqdomain.h>
3#include <linux/module.h>
4#include <linux/mutex.h>
5#include <linux/of.h>
6#include <linux/of_address.h>
7#include <linux/slab.h>
8
9static LIST_HEAD(irq_domain_list);
10static DEFINE_MUTEX(irq_domain_mutex);
11
12/**
13 * irq_domain_add() - Register an irq_domain
14 * @domain: ptr to initialized irq_domain structure
15 *
16 * Registers an irq_domain structure. The irq_domain must at a minimum be
17 * initialized with an ops structure pointer, and either a ->to_irq hook or
18 * a valid irq_base value. Everything else is optional.
19 */
20void irq_domain_add(struct irq_domain *domain)
21{
22 struct irq_data *d;
23 int hwirq;
24
25 /*
26 * This assumes that the irq_domain owner has already allocated
27 * the irq_descs. This block will be removed when support for dynamic
28 * allocation of irq_descs is added to irq_domain.
29 */
30 for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
31 d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
32 if (!d) {
33 WARN(1, "error: assigning domain to non existant irq_desc");
34 return;
35 }
36 if (d->domain) {
37 /* things are broken; just report, don't clean up */
38 WARN(1, "error: irq_desc already assigned to a domain");
39 return;
40 }
41 d->domain = domain;
42 d->hwirq = hwirq;
43 }
44
45 mutex_lock(&irq_domain_mutex);
46 list_add(&domain->list, &irq_domain_list);
47 mutex_unlock(&irq_domain_mutex);
48}
49
50/**
51 * irq_domain_del() - Unregister an irq_domain
52 * @domain: ptr to registered irq_domain.
53 */
54void irq_domain_del(struct irq_domain *domain)
55{
56 struct irq_data *d;
57 int hwirq;
58
59 mutex_lock(&irq_domain_mutex);
60 list_del(&domain->list);
61 mutex_unlock(&irq_domain_mutex);
62
63 /* Clear the irq_domain assignments */
64 for (hwirq = 0; hwirq < domain->nr_irq; hwirq++) {
65 d = irq_get_irq_data(irq_domain_to_irq(domain, hwirq));
66 d->domain = NULL;
67 }
68}
69
70#if defined(CONFIG_OF_IRQ)
71/**
72 * irq_create_of_mapping() - Map a linux irq number from a DT interrupt spec
73 *
74 * Used by the device tree interrupt mapping code to translate a device tree
75 * interrupt specifier to a valid linux irq number. Returns either a valid
76 * linux IRQ number or 0.
77 *
78 * When the caller no longer need the irq number returned by this function it
79 * should arrange to call irq_dispose_mapping().
80 */
81unsigned int irq_create_of_mapping(struct device_node *controller,
82 const u32 *intspec, unsigned int intsize)
83{
84 struct irq_domain *domain;
85 unsigned long hwirq;
86 unsigned int irq, type;
87 int rc = -EINVAL;
88
89 /* Find a domain which can translate the irq spec */
90 mutex_lock(&irq_domain_mutex);
91 list_for_each_entry(domain, &irq_domain_list, list) {
92 if (!domain->ops->dt_translate)
93 continue;
94 rc = domain->ops->dt_translate(domain, controller,
95 intspec, intsize, &hwirq, &type);
96 if (rc == 0)
97 break;
98 }
99 mutex_unlock(&irq_domain_mutex);
100
101 if (rc != 0)
102 return 0;
103
104 irq = irq_domain_to_irq(domain, hwirq);
105 if (type != IRQ_TYPE_NONE)
106 irq_set_irq_type(irq, type);
107 pr_debug("%s: mapped hwirq=%i to irq=%i, flags=%x\n",
108 controller->full_name, (int)hwirq, irq, type);
109 return irq;
110}
111EXPORT_SYMBOL_GPL(irq_create_of_mapping);
112
113/**
114 * irq_dispose_mapping() - Discard a mapping created by irq_create_of_mapping()
115 * @irq: linux irq number to be discarded
116 *
117 * Calling this function indicates the caller no longer needs a reference to
118 * the linux irq number returned by a prior call to irq_create_of_mapping().
119 */
120void irq_dispose_mapping(unsigned int irq)
121{
122 /*
123 * nothing yet; will be filled when support for dynamic allocation of
124 * irq_descs is added to irq_domain
125 */
126}
127EXPORT_SYMBOL_GPL(irq_dispose_mapping);
128
129int irq_domain_simple_dt_translate(struct irq_domain *d,
130 struct device_node *controller,
131 const u32 *intspec, unsigned int intsize,
132 unsigned long *out_hwirq, unsigned int *out_type)
133{
134 if (d->of_node != controller)
135 return -EINVAL;
136 if (intsize < 1)
137 return -EINVAL;
138
139 *out_hwirq = intspec[0];
140 *out_type = IRQ_TYPE_NONE;
141 if (intsize > 1)
142 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
143 return 0;
144}
145
146struct irq_domain_ops irq_domain_simple_ops = {
147 .dt_translate = irq_domain_simple_dt_translate,
148};
149EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
150
151/**
152 * irq_domain_create_simple() - Set up a 'simple' translation range
153 */
154void irq_domain_add_simple(struct device_node *controller, int irq_base)
155{
156 struct irq_domain *domain;
157
158 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
159 if (!domain) {
160 WARN_ON(1);
161 return;
162 }
163
164 domain->irq_base = irq_base;
165 domain->of_node = of_node_get(controller);
166 domain->ops = &irq_domain_simple_ops;
167 irq_domain_add(domain);
168}
169EXPORT_SYMBOL_GPL(irq_domain_add_simple);
170
171void irq_domain_generate_simple(const struct of_device_id *match,
172 u64 phys_base, unsigned int irq_start)
173{
174 struct device_node *node;
175 pr_info("looking for phys_base=%llx, irq_start=%i\n",
176 (unsigned long long) phys_base, (int) irq_start);
177 node = of_find_matching_node_by_address(NULL, match, phys_base);
178 if (node)
179 irq_domain_add_simple(node, irq_start);
180 else
181 pr_info("no node found\n");
182}
183EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
184#endif /* CONFIG_OF_IRQ */