1 #define pr_fmt(fmt) "irq: " fmt
3 #include <linux/debugfs.h>
4 #include <linux/hardirq.h>
5 #include <linux/interrupt.h>
7 #include <linux/irqdesc.h>
8 #include <linux/irqdomain.h>
9 #include <linux/module.h>
10 #include <linux/mutex.h>
12 #include <linux/of_address.h>
13 #include <linux/topology.h>
14 #include <linux/seq_file.h>
15 #include <linux/slab.h>
16 #include <linux/smp.h>
19 #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
20 * ie. legacy 8259, gets irqs 1..15 */
21 #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
22 #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
23 #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
25 static LIST_HEAD(irq_domain_list);
26 static DEFINE_MUTEX(irq_domain_mutex);
28 static DEFINE_MUTEX(revmap_trees_mutex);
29 static struct irq_domain *irq_default_domain;
32 * irq_domain_alloc() - Allocate a new irq_domain data structure
33 * @of_node: optional device-tree node of the interrupt controller
34 * @revmap_type: type of reverse mapping to use
35 * @ops: map/unmap domain callbacks
36 * @host_data: Controller private data pointer
38 * Allocates and initialize and irq_domain structure. Caller is expected to
39 * register allocated irq_domain with irq_domain_register(). Returns pointer
40 * to IRQ domain, or NULL on failure.
42 static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
43 unsigned int revmap_type,
44 const struct irq_domain_ops *ops,
47 struct irq_domain *domain;
49 domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
50 of_node_to_nid(of_node));
55 domain->revmap_type = revmap_type;
57 domain->host_data = host_data;
58 domain->of_node = of_node_get(of_node);
63 static void irq_domain_free(struct irq_domain *domain)
65 of_node_put(domain->of_node);
69 static void irq_domain_add(struct irq_domain *domain)
71 mutex_lock(&irq_domain_mutex);
72 list_add(&domain->link, &irq_domain_list);
73 mutex_unlock(&irq_domain_mutex);
74 pr_debug("Allocated domain of type %d @0x%p\n",
75 domain->revmap_type, domain);
79 * irq_domain_remove() - Remove an irq domain.
80 * @domain: domain to remove
82 * This routine is used to remove an irq domain. The caller must ensure
83 * that all mappings within the domain have been disposed of prior to
84 * use, depending on the revmap type.
86 void irq_domain_remove(struct irq_domain *domain)
88 mutex_lock(&irq_domain_mutex);
90 switch (domain->revmap_type) {
91 case IRQ_DOMAIN_MAP_LEGACY:
93 * Legacy domains don't manage their own irq_desc
94 * allocations, we expect the caller to handle irq_desc
95 * freeing on their own.
98 case IRQ_DOMAIN_MAP_TREE:
100 * radix_tree_delete() takes care of destroying the root
101 * node when all entries are removed. Shout if there are
104 WARN_ON(domain->revmap_data.tree.height);
106 case IRQ_DOMAIN_MAP_LINEAR:
107 kfree(domain->revmap_data.linear.revmap);
108 domain->revmap_data.linear.size = 0;
110 case IRQ_DOMAIN_MAP_NOMAP:
114 list_del(&domain->link);
117 * If the going away domain is the default one, reset it.
119 if (unlikely(irq_default_domain == domain))
120 irq_set_default_host(NULL);
122 mutex_unlock(&irq_domain_mutex);
124 pr_debug("Removed domain of type %d @0x%p\n",
125 domain->revmap_type, domain);
127 irq_domain_free(domain);
129 EXPORT_SYMBOL_GPL(irq_domain_remove);
131 static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
132 irq_hw_number_t hwirq)
134 irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
135 int size = domain->revmap_data.legacy.size;
137 if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
139 return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
143 * irq_domain_add_simple() - Allocate and register a simple irq_domain.
144 * @of_node: pointer to interrupt controller's device tree node.
145 * @size: total number of irqs in mapping
146 * @first_irq: first number of irq block assigned to the domain,
147 * pass zero to assign irqs on-the-fly. This will result in a
148 * linear IRQ domain so it is important to use irq_create_mapping()
149 * for each used IRQ, especially when SPARSE_IRQ is enabled.
150 * @ops: map/unmap domain callbacks
151 * @host_data: Controller private data pointer
153 * Allocates a legacy irq_domain if irq_base is positive or a linear
154 * domain otherwise. For the legacy domain, IRQ descriptors will also
157 * This is intended to implement the expected behaviour for most
158 * interrupt controllers which is that a linear mapping should
159 * normally be used unless the system requires a legacy mapping in
160 * order to support supplying interrupt numbers during non-DT
161 * registration of devices.
163 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
165 unsigned int first_irq,
166 const struct irq_domain_ops *ops,
172 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
174 * Set the descriptor allocator to search for a
175 * 1-to-1 mapping, such as irq_alloc_desc_at().
176 * Use of_node_to_nid() which is defined to
177 * numa_node_id() on platforms that have no custom
180 irq_base = irq_alloc_descs(first_irq, first_irq, size,
181 of_node_to_nid(of_node));
183 pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
185 irq_base = first_irq;
188 irq_base = first_irq;
190 return irq_domain_add_legacy(of_node, size, irq_base, 0,
194 /* A linear domain is the default */
195 return irq_domain_add_linear(of_node, size, ops, host_data);
197 EXPORT_SYMBOL_GPL(irq_domain_add_simple);
200 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
201 * @of_node: pointer to interrupt controller's device tree node.
202 * @size: total number of irqs in legacy mapping
203 * @first_irq: first number of irq block assigned to the domain
204 * @first_hwirq: first hwirq number to use for the translation. Should normally
205 * be '0', but a positive integer can be used if the effective
206 * hwirqs numbering does not begin at zero.
207 * @ops: map/unmap domain callbacks
208 * @host_data: Controller private data pointer
210 * Note: the map() callback will be called before this function returns
211 * for all legacy interrupts except 0 (which is always the invalid irq for
212 * a legacy controller).
214 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
216 unsigned int first_irq,
217 irq_hw_number_t first_hwirq,
218 const struct irq_domain_ops *ops,
221 struct irq_domain *domain;
224 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
228 domain->revmap_data.legacy.first_irq = first_irq;
229 domain->revmap_data.legacy.first_hwirq = first_hwirq;
230 domain->revmap_data.legacy.size = size;
232 mutex_lock(&irq_domain_mutex);
233 /* Verify that all the irqs are available */
234 for (i = 0; i < size; i++) {
235 int irq = first_irq + i;
236 struct irq_data *irq_data = irq_get_irq_data(irq);
238 if (WARN_ON(!irq_data || irq_data->domain)) {
239 mutex_unlock(&irq_domain_mutex);
240 irq_domain_free(domain);
245 /* Claim all of the irqs before registering a legacy domain */
246 for (i = 0; i < size; i++) {
247 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
248 irq_data->hwirq = first_hwirq + i;
249 irq_data->domain = domain;
251 mutex_unlock(&irq_domain_mutex);
253 for (i = 0; i < size; i++) {
254 int irq = first_irq + i;
255 int hwirq = first_hwirq + i;
257 /* IRQ0 gets ignored */
261 /* Legacy flags are left to default at this point,
262 * one can then use irq_create_mapping() to
263 * explicitly change them
266 ops->map(domain, irq, hwirq);
268 /* Clear norequest flags */
269 irq_clear_status_flags(irq, IRQ_NOREQUEST);
272 irq_domain_add(domain);
275 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
278 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
279 * @of_node: pointer to interrupt controller's device tree node.
280 * @size: Number of interrupts in the domain.
281 * @ops: map/unmap domain callbacks
282 * @host_data: Controller private data pointer
284 struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
286 const struct irq_domain_ops *ops,
289 struct irq_domain *domain;
290 unsigned int *revmap;
292 revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
293 of_node_to_nid(of_node));
294 if (WARN_ON(!revmap))
297 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
302 domain->revmap_data.linear.size = size;
303 domain->revmap_data.linear.revmap = revmap;
304 irq_domain_add(domain);
307 EXPORT_SYMBOL_GPL(irq_domain_add_linear);
309 struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
310 unsigned int max_irq,
311 const struct irq_domain_ops *ops,
314 struct irq_domain *domain = irq_domain_alloc(of_node,
315 IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
317 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
318 irq_domain_add(domain);
322 EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
325 * irq_domain_add_tree()
326 * @of_node: pointer to interrupt controller's device tree node.
327 * @ops: map/unmap domain callbacks
329 * Note: The radix tree will be allocated later during boot automatically
330 * (the reverse mapping will use the slow path until that happens).
332 struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
333 const struct irq_domain_ops *ops,
336 struct irq_domain *domain = irq_domain_alloc(of_node,
337 IRQ_DOMAIN_MAP_TREE, ops, host_data);
339 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
340 irq_domain_add(domain);
344 EXPORT_SYMBOL_GPL(irq_domain_add_tree);
347 * irq_find_host() - Locates a domain for a given device node
348 * @node: device-tree node of the interrupt controller
350 struct irq_domain *irq_find_host(struct device_node *node)
352 struct irq_domain *h, *found = NULL;
355 /* We might want to match the legacy controller last since
356 * it might potentially be set to match all interrupts in
357 * the absence of a device node. This isn't a problem so far
360 mutex_lock(&irq_domain_mutex);
361 list_for_each_entry(h, &irq_domain_list, link) {
363 rc = h->ops->match(h, node);
365 rc = (h->of_node != NULL) && (h->of_node == node);
372 mutex_unlock(&irq_domain_mutex);
375 EXPORT_SYMBOL_GPL(irq_find_host);
378 * irq_set_default_host() - Set a "default" irq domain
379 * @domain: default domain pointer
381 * For convenience, it's possible to set a "default" domain that will be used
382 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
383 * platforms that want to manipulate a few hard coded interrupt numbers that
384 * aren't properly represented in the device-tree.
386 void irq_set_default_host(struct irq_domain *domain)
388 pr_debug("Default domain set to @0x%p\n", domain);
390 irq_default_domain = domain;
392 EXPORT_SYMBOL_GPL(irq_set_default_host);
394 static void irq_domain_disassociate_many(struct irq_domain *domain,
395 unsigned int irq_base, int count)
398 * disassociate in reverse order;
399 * not strictly necessary, but nice for unwinding
402 int irq = irq_base + count;
403 struct irq_data *irq_data = irq_get_irq_data(irq);
404 irq_hw_number_t hwirq;
406 if (WARN_ON(!irq_data || irq_data->domain != domain))
409 hwirq = irq_data->hwirq;
410 irq_set_status_flags(irq, IRQ_NOREQUEST);
412 /* remove chip and handler */
413 irq_set_chip_and_handler(irq, NULL, NULL);
415 /* Make sure it's completed */
416 synchronize_irq(irq);
418 /* Tell the PIC about it */
419 if (domain->ops->unmap)
420 domain->ops->unmap(domain, irq);
423 irq_data->domain = NULL;
426 /* Clear reverse map */
427 switch(domain->revmap_type) {
428 case IRQ_DOMAIN_MAP_LINEAR:
429 if (hwirq < domain->revmap_data.linear.size)
430 domain->revmap_data.linear.revmap[hwirq] = 0;
432 case IRQ_DOMAIN_MAP_TREE:
433 mutex_lock(&revmap_trees_mutex);
434 radix_tree_delete(&domain->revmap_data.tree, hwirq);
435 mutex_unlock(&revmap_trees_mutex);
441 int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
442 irq_hw_number_t hwirq_base, int count)
444 unsigned int virq = irq_base;
445 irq_hw_number_t hwirq = hwirq_base;
448 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
449 of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
451 for (i = 0; i < count; i++) {
452 struct irq_data *irq_data = irq_get_irq_data(virq + i);
454 if (WARN(!irq_data, "error: irq_desc not allocated; "
455 "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
457 if (WARN(irq_data->domain, "error: irq_desc already associated; "
458 "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
462 for (i = 0; i < count; i++, virq++, hwirq++) {
463 struct irq_data *irq_data = irq_get_irq_data(virq);
465 irq_data->hwirq = hwirq;
466 irq_data->domain = domain;
467 if (domain->ops->map) {
468 ret = domain->ops->map(domain, virq, hwirq);
471 * If map() returns -EPERM, this interrupt is protected
472 * by the firmware or some other service and shall not
475 * Since on some platforms we blindly try to map everything
476 * we end up with a log full of backtraces.
478 * So instead, we silently fail on -EPERM, it is the
479 * responsibility of the PIC driver to display a relevant
483 pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
487 irq_data->domain = NULL;
493 switch (domain->revmap_type) {
494 case IRQ_DOMAIN_MAP_LINEAR:
495 if (hwirq < domain->revmap_data.linear.size)
496 domain->revmap_data.linear.revmap[hwirq] = virq;
498 case IRQ_DOMAIN_MAP_TREE:
499 mutex_lock(&revmap_trees_mutex);
500 radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
501 mutex_unlock(&revmap_trees_mutex);
505 irq_clear_status_flags(virq, IRQ_NOREQUEST);
511 irq_domain_disassociate_many(domain, irq_base, i);
514 EXPORT_SYMBOL_GPL(irq_domain_associate_many);
517 * irq_create_direct_mapping() - Allocate an irq for direct mapping
518 * @domain: domain to allocate the irq for or NULL for default domain
520 * This routine is used for irq controllers which can choose the hardware
521 * interrupt numbers they generate. In such a case it's simplest to use
522 * the linux irq as the hardware interrupt number.
524 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
529 domain = irq_default_domain;
531 if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
534 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
536 pr_debug("create_direct virq allocation failed\n");
539 if (virq >= domain->revmap_data.nomap.max_irq) {
540 pr_err("ERROR: no free irqs available below %i maximum\n",
541 domain->revmap_data.nomap.max_irq);
545 pr_debug("create_direct obtained virq %d\n", virq);
547 if (irq_domain_associate(domain, virq, virq)) {
554 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
557 * irq_create_mapping() - Map a hardware interrupt into linux irq space
558 * @domain: domain owning this hardware interrupt or NULL for default domain
559 * @hwirq: hardware irq number in that domain space
561 * Only one mapping per hardware interrupt is permitted. Returns a linux
563 * If the sense/trigger is to be specified, set_irq_type() should be called
564 * on the number returned from that call.
566 unsigned int irq_create_mapping(struct irq_domain *domain,
567 irq_hw_number_t hwirq)
572 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
574 /* Look for default domain if nececssary */
576 domain = irq_default_domain;
577 if (domain == NULL) {
578 pr_warning("irq_create_mapping called for"
579 " NULL domain, hwirq=%lx\n", hwirq);
583 pr_debug("-> using domain @%p\n", domain);
585 /* Check if mapping already exists */
586 virq = irq_find_mapping(domain, hwirq);
588 pr_debug("-> existing mapping on virq %d\n", virq);
592 /* Get a virtual interrupt number */
593 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
594 return irq_domain_legacy_revmap(domain, hwirq);
596 /* Allocate a virtual interrupt number */
597 hint = hwirq % nr_irqs;
600 virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
602 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
604 pr_debug("-> virq allocation failed\n");
608 if (irq_domain_associate(domain, virq, hwirq)) {
613 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
614 hwirq, of_node_full_name(domain->of_node), virq);
618 EXPORT_SYMBOL_GPL(irq_create_mapping);
621 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
622 * @domain: domain owning the interrupt range
623 * @irq_base: beginning of linux IRQ range
624 * @hwirq_base: beginning of hardware IRQ range
625 * @count: Number of interrupts to map
627 * This routine is used for allocating and mapping a range of hardware
628 * irqs to linux irqs where the linux irq numbers are at pre-defined
629 * locations. For use by controllers that already have static mappings
630 * to insert in to the domain.
632 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
635 * 0 is returned upon success, while any failure to establish a static
636 * mapping is treated as an error.
638 int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
639 irq_hw_number_t hwirq_base, int count)
643 ret = irq_alloc_descs(irq_base, irq_base, count,
644 of_node_to_nid(domain->of_node));
645 if (unlikely(ret < 0))
648 ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
649 if (unlikely(ret < 0)) {
650 irq_free_descs(irq_base, count);
656 EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
658 unsigned int irq_create_of_mapping(struct device_node *controller,
659 const u32 *intspec, unsigned int intsize)
661 struct irq_domain *domain;
662 irq_hw_number_t hwirq;
663 unsigned int type = IRQ_TYPE_NONE;
666 domain = controller ? irq_find_host(controller) : irq_default_domain;
670 * Workaround to avoid breaking interrupt controller drivers
671 * that don't yet register an irq_domain. This is temporary
672 * code. ~~~gcl, Feb 24, 2012
674 * Scheduled for removal in Linux v3.6. That should be enough
680 pr_warning("no irq domain found for %s !\n",
681 of_node_full_name(controller));
685 /* If domain has no translation, then we assume interrupt line */
686 if (domain->ops->xlate == NULL)
689 if (domain->ops->xlate(domain, controller, intspec, intsize,
695 virq = irq_create_mapping(domain, hwirq);
699 /* Set type if specified and different than the current one */
700 if (type != IRQ_TYPE_NONE &&
701 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
702 irq_set_irq_type(virq, type);
705 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
708 * irq_dispose_mapping() - Unmap an interrupt
709 * @virq: linux irq number of the interrupt to unmap
711 void irq_dispose_mapping(unsigned int virq)
713 struct irq_data *irq_data = irq_get_irq_data(virq);
714 struct irq_domain *domain;
716 if (!virq || !irq_data)
719 domain = irq_data->domain;
720 if (WARN_ON(domain == NULL))
723 /* Never unmap legacy interrupts */
724 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
727 irq_domain_disassociate_many(domain, virq, 1);
730 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
733 * irq_find_mapping() - Find a linux irq from an hw irq number.
734 * @domain: domain owning this hardware interrupt
735 * @hwirq: hardware irq number in that domain space
737 unsigned int irq_find_mapping(struct irq_domain *domain,
738 irq_hw_number_t hwirq)
740 struct irq_data *data;
742 /* Look for default domain if nececssary */
744 domain = irq_default_domain;
748 switch (domain->revmap_type) {
749 case IRQ_DOMAIN_MAP_LEGACY:
750 return irq_domain_legacy_revmap(domain, hwirq);
751 case IRQ_DOMAIN_MAP_LINEAR:
752 return irq_linear_revmap(domain, hwirq);
753 case IRQ_DOMAIN_MAP_TREE:
755 data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
760 case IRQ_DOMAIN_MAP_NOMAP:
761 data = irq_get_irq_data(hwirq);
762 if (data && (data->domain == domain) && (data->hwirq == hwirq))
769 EXPORT_SYMBOL_GPL(irq_find_mapping);
772 * irq_linear_revmap() - Find a linux irq from a hw irq number.
773 * @domain: domain owning this hardware interrupt
774 * @hwirq: hardware irq number in that domain space
776 * This is a fast path that can be called directly by irq controller code to
777 * save a handful of instructions.
779 unsigned int irq_linear_revmap(struct irq_domain *domain,
780 irq_hw_number_t hwirq)
782 BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
784 /* Check revmap bounds; complain if exceeded */
785 if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
788 return domain->revmap_data.linear.revmap[hwirq];
790 EXPORT_SYMBOL_GPL(irq_linear_revmap);
792 #ifdef CONFIG_IRQ_DOMAIN_DEBUG
793 static int virq_debug_show(struct seq_file *m, void *private)
796 struct irq_desc *desc;
798 static const char none[] = "none";
802 seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq",
803 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
806 for (i = 1; i < nr_irqs; i++) {
807 desc = irq_to_desc(i);
811 raw_spin_lock_irqsave(&desc->lock, flags);
813 if (desc->action && desc->action->handler) {
814 struct irq_chip *chip;
816 seq_printf(m, "%5d ", i);
817 seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
819 chip = irq_desc_get_chip(desc);
820 if (chip && chip->name)
824 seq_printf(m, "%-15s ", p);
826 data = irq_desc_get_chip_data(desc);
827 seq_printf(m, data ? "0x%p " : " %p ", data);
829 if (desc->irq_data.domain)
830 p = of_node_full_name(desc->irq_data.domain->of_node);
833 seq_printf(m, "%s\n", p);
836 raw_spin_unlock_irqrestore(&desc->lock, flags);
842 static int virq_debug_open(struct inode *inode, struct file *file)
844 return single_open(file, virq_debug_show, inode->i_private);
847 static const struct file_operations virq_debug_fops = {
848 .open = virq_debug_open,
851 .release = single_release,
854 static int __init irq_debugfs_init(void)
856 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
857 NULL, &virq_debug_fops) == NULL)
862 __initcall(irq_debugfs_init);
863 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
866 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
868 * Device Tree IRQ specifier translation function which works with one cell
869 * bindings where the cell value maps directly to the hwirq number.
871 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
872 const u32 *intspec, unsigned int intsize,
873 unsigned long *out_hwirq, unsigned int *out_type)
875 if (WARN_ON(intsize < 1))
877 *out_hwirq = intspec[0];
878 *out_type = IRQ_TYPE_NONE;
881 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
884 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
886 * Device Tree IRQ specifier translation function which works with two cell
887 * bindings where the cell values map directly to the hwirq number
888 * and linux irq flags.
890 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
891 const u32 *intspec, unsigned int intsize,
892 irq_hw_number_t *out_hwirq, unsigned int *out_type)
894 if (WARN_ON(intsize < 2))
896 *out_hwirq = intspec[0];
897 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
900 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
903 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
905 * Device Tree IRQ specifier translation function which works with either one
906 * or two cell bindings where the cell values map directly to the hwirq number
907 * and linux irq flags.
909 * Note: don't use this function unless your interrupt controller explicitly
910 * supports both one and two cell bindings. For the majority of controllers
911 * the _onecell() or _twocell() variants above should be used.
913 int irq_domain_xlate_onetwocell(struct irq_domain *d,
914 struct device_node *ctrlr,
915 const u32 *intspec, unsigned int intsize,
916 unsigned long *out_hwirq, unsigned int *out_type)
918 if (WARN_ON(intsize < 1))
920 *out_hwirq = intspec[0];
921 *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
924 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
926 const struct irq_domain_ops irq_domain_simple_ops = {
927 .xlate = irq_domain_xlate_onetwocell,
929 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
932 void irq_domain_generate_simple(const struct of_device_id *match,
933 u64 phys_base, unsigned int irq_start)
935 struct device_node *node;
936 pr_debug("looking for phys_base=%llx, irq_start=%i\n",
937 (unsigned long long) phys_base, (int) irq_start);
938 node = of_find_matching_node_by_address(NULL, match, phys_base);
940 irq_domain_add_legacy(node, 32, irq_start, 0,
941 &irq_domain_simple_ops, NULL);
943 EXPORT_SYMBOL_GPL(irq_domain_generate_simple);