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/seq_file.h>
14 #include <linux/slab.h>
15 #include <linux/smp.h>
18 #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
19 * ie. legacy 8259, gets irqs 1..15 */
20 #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
21 #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
22 #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
24 static LIST_HEAD(irq_domain_list);
25 static DEFINE_MUTEX(irq_domain_mutex);
27 static DEFINE_MUTEX(revmap_trees_mutex);
28 static struct irq_domain *irq_default_domain;
31 * irq_domain_alloc() - Allocate a new irq_domain data structure
32 * @of_node: optional device-tree node of the interrupt controller
33 * @revmap_type: type of reverse mapping to use
34 * @ops: map/unmap domain callbacks
35 * @host_data: Controller private data pointer
37 * Allocates and initialize and irq_domain structure. Caller is expected to
38 * register allocated irq_domain with irq_domain_register(). Returns pointer
39 * to IRQ domain, or NULL on failure.
41 static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
42 unsigned int revmap_type,
43 const struct irq_domain_ops *ops,
46 struct irq_domain *domain;
48 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
53 domain->revmap_type = revmap_type;
55 domain->host_data = host_data;
56 domain->of_node = of_node_get(of_node);
61 static void irq_domain_free(struct irq_domain *domain)
63 of_node_put(domain->of_node);
67 static void irq_domain_add(struct irq_domain *domain)
69 mutex_lock(&irq_domain_mutex);
70 list_add(&domain->link, &irq_domain_list);
71 mutex_unlock(&irq_domain_mutex);
72 pr_debug("Allocated domain of type %d @0x%p\n",
73 domain->revmap_type, domain);
77 * irq_domain_remove() - Remove an irq domain.
78 * @domain: domain to remove
80 * This routine is used to remove an irq domain. The caller must ensure
81 * that all mappings within the domain have been disposed of prior to
82 * use, depending on the revmap type.
84 void irq_domain_remove(struct irq_domain *domain)
86 mutex_lock(&irq_domain_mutex);
88 switch (domain->revmap_type) {
89 case IRQ_DOMAIN_MAP_LEGACY:
91 * Legacy domains don't manage their own irq_desc
92 * allocations, we expect the caller to handle irq_desc
93 * freeing on their own.
96 case IRQ_DOMAIN_MAP_TREE:
98 * radix_tree_delete() takes care of destroying the root
99 * node when all entries are removed. Shout if there are
102 WARN_ON(domain->revmap_data.tree.height);
104 case IRQ_DOMAIN_MAP_LINEAR:
105 kfree(domain->revmap_data.linear.revmap);
106 domain->revmap_data.linear.size = 0;
108 case IRQ_DOMAIN_MAP_NOMAP:
112 list_del(&domain->link);
115 * If the going away domain is the default one, reset it.
117 if (unlikely(irq_default_domain == domain))
118 irq_set_default_host(NULL);
120 mutex_unlock(&irq_domain_mutex);
122 pr_debug("Removed domain of type %d @0x%p\n",
123 domain->revmap_type, domain);
125 irq_domain_free(domain);
127 EXPORT_SYMBOL_GPL(irq_domain_remove);
129 static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
130 irq_hw_number_t hwirq)
132 irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
133 int size = domain->revmap_data.legacy.size;
135 if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
137 return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
141 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
142 * @of_node: pointer to interrupt controller's device tree node.
143 * @size: total number of irqs in legacy mapping
144 * @first_irq: first number of irq block assigned to the domain
145 * @first_hwirq: first hwirq number to use for the translation. Should normally
146 * be '0', but a positive integer can be used if the effective
147 * hwirqs numbering does not begin at zero.
148 * @ops: map/unmap domain callbacks
149 * @host_data: Controller private data pointer
151 * Note: the map() callback will be called before this function returns
152 * for all legacy interrupts except 0 (which is always the invalid irq for
153 * a legacy controller).
155 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
157 unsigned int first_irq,
158 irq_hw_number_t first_hwirq,
159 const struct irq_domain_ops *ops,
162 struct irq_domain *domain;
165 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
169 domain->revmap_data.legacy.first_irq = first_irq;
170 domain->revmap_data.legacy.first_hwirq = first_hwirq;
171 domain->revmap_data.legacy.size = size;
173 mutex_lock(&irq_domain_mutex);
174 /* Verify that all the irqs are available */
175 for (i = 0; i < size; i++) {
176 int irq = first_irq + i;
177 struct irq_data *irq_data = irq_get_irq_data(irq);
179 if (WARN_ON(!irq_data || irq_data->domain)) {
180 mutex_unlock(&irq_domain_mutex);
181 irq_domain_free(domain);
186 /* Claim all of the irqs before registering a legacy domain */
187 for (i = 0; i < size; i++) {
188 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
189 irq_data->hwirq = first_hwirq + i;
190 irq_data->domain = domain;
192 mutex_unlock(&irq_domain_mutex);
194 for (i = 0; i < size; i++) {
195 int irq = first_irq + i;
196 int hwirq = first_hwirq + i;
198 /* IRQ0 gets ignored */
202 /* Legacy flags are left to default at this point,
203 * one can then use irq_create_mapping() to
204 * explicitly change them
206 ops->map(domain, irq, hwirq);
208 /* Clear norequest flags */
209 irq_clear_status_flags(irq, IRQ_NOREQUEST);
212 irq_domain_add(domain);
215 EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
218 * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain.
219 * @of_node: pointer to interrupt controller's device tree node.
220 * @size: Number of interrupts in the domain.
221 * @ops: map/unmap domain callbacks
222 * @host_data: Controller private data pointer
224 struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
226 const struct irq_domain_ops *ops,
229 struct irq_domain *domain;
230 unsigned int *revmap;
232 revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL);
233 if (WARN_ON(!revmap))
236 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
241 domain->revmap_data.linear.size = size;
242 domain->revmap_data.linear.revmap = revmap;
243 irq_domain_add(domain);
246 EXPORT_SYMBOL_GPL(irq_domain_add_linear);
248 struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
249 unsigned int max_irq,
250 const struct irq_domain_ops *ops,
253 struct irq_domain *domain = irq_domain_alloc(of_node,
254 IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
256 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
257 irq_domain_add(domain);
261 EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
264 * irq_domain_add_tree()
265 * @of_node: pointer to interrupt controller's device tree node.
266 * @ops: map/unmap domain callbacks
268 * Note: The radix tree will be allocated later during boot automatically
269 * (the reverse mapping will use the slow path until that happens).
271 struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
272 const struct irq_domain_ops *ops,
275 struct irq_domain *domain = irq_domain_alloc(of_node,
276 IRQ_DOMAIN_MAP_TREE, ops, host_data);
278 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
279 irq_domain_add(domain);
283 EXPORT_SYMBOL_GPL(irq_domain_add_tree);
286 * irq_find_host() - Locates a domain for a given device node
287 * @node: device-tree node of the interrupt controller
289 struct irq_domain *irq_find_host(struct device_node *node)
291 struct irq_domain *h, *found = NULL;
294 /* We might want to match the legacy controller last since
295 * it might potentially be set to match all interrupts in
296 * the absence of a device node. This isn't a problem so far
299 mutex_lock(&irq_domain_mutex);
300 list_for_each_entry(h, &irq_domain_list, link) {
302 rc = h->ops->match(h, node);
304 rc = (h->of_node != NULL) && (h->of_node == node);
311 mutex_unlock(&irq_domain_mutex);
314 EXPORT_SYMBOL_GPL(irq_find_host);
317 * irq_set_default_host() - Set a "default" irq domain
318 * @domain: default domain pointer
320 * For convenience, it's possible to set a "default" domain that will be used
321 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
322 * platforms that want to manipulate a few hard coded interrupt numbers that
323 * aren't properly represented in the device-tree.
325 void irq_set_default_host(struct irq_domain *domain)
327 pr_debug("Default domain set to @0x%p\n", domain);
329 irq_default_domain = domain;
331 EXPORT_SYMBOL_GPL(irq_set_default_host);
333 static int irq_setup_virq(struct irq_domain *domain, unsigned int virq,
334 irq_hw_number_t hwirq)
336 struct irq_data *irq_data = irq_get_irq_data(virq);
338 irq_data->hwirq = hwirq;
339 irq_data->domain = domain;
340 if (domain->ops->map(domain, virq, hwirq)) {
341 pr_debug("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq);
342 irq_data->domain = NULL;
347 irq_clear_status_flags(virq, IRQ_NOREQUEST);
353 * irq_create_direct_mapping() - Allocate an irq for direct mapping
354 * @domain: domain to allocate the irq for or NULL for default domain
356 * This routine is used for irq controllers which can choose the hardware
357 * interrupt numbers they generate. In such a case it's simplest to use
358 * the linux irq as the hardware interrupt number.
360 unsigned int irq_create_direct_mapping(struct irq_domain *domain)
365 domain = irq_default_domain;
367 BUG_ON(domain == NULL);
368 WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP);
370 virq = irq_alloc_desc_from(1, 0);
372 pr_debug("create_direct virq allocation failed\n");
375 if (virq >= domain->revmap_data.nomap.max_irq) {
376 pr_err("ERROR: no free irqs available below %i maximum\n",
377 domain->revmap_data.nomap.max_irq);
381 pr_debug("create_direct obtained virq %d\n", virq);
383 if (irq_setup_virq(domain, virq, virq)) {
390 EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
393 * irq_create_mapping() - Map a hardware interrupt into linux irq space
394 * @domain: domain owning this hardware interrupt or NULL for default domain
395 * @hwirq: hardware irq number in that domain space
397 * Only one mapping per hardware interrupt is permitted. Returns a linux
399 * If the sense/trigger is to be specified, set_irq_type() should be called
400 * on the number returned from that call.
402 unsigned int irq_create_mapping(struct irq_domain *domain,
403 irq_hw_number_t hwirq)
408 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
410 /* Look for default domain if nececssary */
412 domain = irq_default_domain;
413 if (domain == NULL) {
414 pr_warning("irq_create_mapping called for"
415 " NULL domain, hwirq=%lx\n", hwirq);
419 pr_debug("-> using domain @%p\n", domain);
421 /* Check if mapping already exists */
422 virq = irq_find_mapping(domain, hwirq);
424 pr_debug("-> existing mapping on virq %d\n", virq);
428 /* Get a virtual interrupt number */
429 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
430 return irq_domain_legacy_revmap(domain, hwirq);
432 /* Allocate a virtual interrupt number */
433 hint = hwirq % nr_irqs;
436 virq = irq_alloc_desc_from(hint, 0);
438 virq = irq_alloc_desc_from(1, 0);
440 pr_debug("-> virq allocation failed\n");
444 if (irq_setup_virq(domain, virq, hwirq)) {
445 if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY)
450 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
451 hwirq, domain->of_node ? domain->of_node->full_name : "null", virq);
455 EXPORT_SYMBOL_GPL(irq_create_mapping);
457 unsigned int irq_create_of_mapping(struct device_node *controller,
458 const u32 *intspec, unsigned int intsize)
460 struct irq_domain *domain;
461 irq_hw_number_t hwirq;
462 unsigned int type = IRQ_TYPE_NONE;
465 domain = controller ? irq_find_host(controller) : irq_default_domain;
469 * Workaround to avoid breaking interrupt controller drivers
470 * that don't yet register an irq_domain. This is temporary
471 * code. ~~~gcl, Feb 24, 2012
473 * Scheduled for removal in Linux v3.6. That should be enough
479 pr_warning("no irq domain found for %s !\n",
480 controller->full_name);
484 /* If domain has no translation, then we assume interrupt line */
485 if (domain->ops->xlate == NULL)
488 if (domain->ops->xlate(domain, controller, intspec, intsize,
494 virq = irq_create_mapping(domain, hwirq);
498 /* Set type if specified and different than the current one */
499 if (type != IRQ_TYPE_NONE &&
500 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
501 irq_set_irq_type(virq, type);
504 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
507 * irq_dispose_mapping() - Unmap an interrupt
508 * @virq: linux irq number of the interrupt to unmap
510 void irq_dispose_mapping(unsigned int virq)
512 struct irq_data *irq_data = irq_get_irq_data(virq);
513 struct irq_domain *domain;
514 irq_hw_number_t hwirq;
516 if (!virq || !irq_data)
519 domain = irq_data->domain;
520 if (WARN_ON(domain == NULL))
523 /* Never unmap legacy interrupts */
524 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
527 irq_set_status_flags(virq, IRQ_NOREQUEST);
529 /* remove chip and handler */
530 irq_set_chip_and_handler(virq, NULL, NULL);
532 /* Make sure it's completed */
533 synchronize_irq(virq);
535 /* Tell the PIC about it */
536 if (domain->ops->unmap)
537 domain->ops->unmap(domain, virq);
540 /* Clear reverse map */
541 hwirq = irq_data->hwirq;
542 switch(domain->revmap_type) {
543 case IRQ_DOMAIN_MAP_LINEAR:
544 if (hwirq < domain->revmap_data.linear.size)
545 domain->revmap_data.linear.revmap[hwirq] = 0;
547 case IRQ_DOMAIN_MAP_TREE:
548 mutex_lock(&revmap_trees_mutex);
549 radix_tree_delete(&domain->revmap_data.tree, hwirq);
550 mutex_unlock(&revmap_trees_mutex);
556 EXPORT_SYMBOL_GPL(irq_dispose_mapping);
559 * irq_find_mapping() - Find a linux irq from an hw irq number.
560 * @domain: domain owning this hardware interrupt
561 * @hwirq: hardware irq number in that domain space
563 * This is a slow path, for use by generic code. It's expected that an
564 * irq controller implementation directly calls the appropriate low level
567 unsigned int irq_find_mapping(struct irq_domain *domain,
568 irq_hw_number_t hwirq)
571 unsigned int hint = hwirq % nr_irqs;
573 /* Look for default domain if nececssary */
575 domain = irq_default_domain;
579 /* legacy -> bail early */
580 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
581 return irq_domain_legacy_revmap(domain, hwirq);
583 /* Slow path does a linear search of the map */
588 struct irq_data *data = irq_get_irq_data(i);
589 if (data && (data->domain == domain) && (data->hwirq == hwirq))
597 EXPORT_SYMBOL_GPL(irq_find_mapping);
600 * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number.
601 * @domain: domain owning this hardware interrupt
602 * @hwirq: hardware irq number in that domain space
604 * This is a fast path, for use by irq controller code that uses radix tree
607 unsigned int irq_radix_revmap_lookup(struct irq_domain *domain,
608 irq_hw_number_t hwirq)
610 struct irq_data *irq_data;
612 if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
613 return irq_find_mapping(domain, hwirq);
616 * Freeing an irq can delete nodes along the path to
617 * do the lookup via call_rcu.
620 irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
624 * If found in radix tree, then fine.
625 * Else fallback to linear lookup - this should not happen in practice
626 * as it means that we failed to insert the node in the radix tree.
628 return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq);
630 EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup);
633 * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping.
634 * @domain: domain owning this hardware interrupt
635 * @virq: linux irq number
636 * @hwirq: hardware irq number in that domain space
638 * This is for use by irq controllers that use a radix tree reverse
639 * mapping for fast lookup.
641 void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq,
642 irq_hw_number_t hwirq)
644 struct irq_data *irq_data = irq_get_irq_data(virq);
646 if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE))
650 mutex_lock(&revmap_trees_mutex);
651 radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
652 mutex_unlock(&revmap_trees_mutex);
655 EXPORT_SYMBOL_GPL(irq_radix_revmap_insert);
658 * irq_linear_revmap() - Find a linux irq from a hw irq number.
659 * @domain: domain owning this hardware interrupt
660 * @hwirq: hardware irq number in that domain space
662 * This is a fast path, for use by irq controller code that uses linear
663 * revmaps. It does fallback to the slow path if the revmap doesn't exist
664 * yet and will create the revmap entry with appropriate locking
666 unsigned int irq_linear_revmap(struct irq_domain *domain,
667 irq_hw_number_t hwirq)
669 unsigned int *revmap;
671 if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR))
672 return irq_find_mapping(domain, hwirq);
674 /* Check revmap bounds */
675 if (unlikely(hwirq >= domain->revmap_data.linear.size))
676 return irq_find_mapping(domain, hwirq);
678 /* Check if revmap was allocated */
679 revmap = domain->revmap_data.linear.revmap;
680 if (unlikely(revmap == NULL))
681 return irq_find_mapping(domain, hwirq);
683 /* Fill up revmap with slow path if no mapping found */
684 if (unlikely(!revmap[hwirq]))
685 revmap[hwirq] = irq_find_mapping(domain, hwirq);
687 return revmap[hwirq];
689 EXPORT_SYMBOL_GPL(irq_linear_revmap);
691 #ifdef CONFIG_IRQ_DOMAIN_DEBUG
692 static int virq_debug_show(struct seq_file *m, void *private)
695 struct irq_desc *desc;
697 static const char none[] = "none";
701 seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq",
702 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
705 for (i = 1; i < nr_irqs; i++) {
706 desc = irq_to_desc(i);
710 raw_spin_lock_irqsave(&desc->lock, flags);
712 if (desc->action && desc->action->handler) {
713 struct irq_chip *chip;
715 seq_printf(m, "%5d ", i);
716 seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
718 chip = irq_desc_get_chip(desc);
719 if (chip && chip->name)
723 seq_printf(m, "%-15s ", p);
725 data = irq_desc_get_chip_data(desc);
726 seq_printf(m, data ? "0x%p " : " %p ", data);
728 if (desc->irq_data.domain && desc->irq_data.domain->of_node)
729 p = desc->irq_data.domain->of_node->full_name;
732 seq_printf(m, "%s\n", p);
735 raw_spin_unlock_irqrestore(&desc->lock, flags);
741 static int virq_debug_open(struct inode *inode, struct file *file)
743 return single_open(file, virq_debug_show, inode->i_private);
746 static const struct file_operations virq_debug_fops = {
747 .open = virq_debug_open,
750 .release = single_release,
753 static int __init irq_debugfs_init(void)
755 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
756 NULL, &virq_debug_fops) == NULL)
761 __initcall(irq_debugfs_init);
762 #endif /* CONFIG_IRQ_DOMAIN_DEBUG */
764 static int irq_domain_simple_map(struct irq_domain *d, unsigned int irq,
765 irq_hw_number_t hwirq)
771 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
773 * Device Tree IRQ specifier translation function which works with one cell
774 * bindings where the cell value maps directly to the hwirq number.
776 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
777 const u32 *intspec, unsigned int intsize,
778 unsigned long *out_hwirq, unsigned int *out_type)
780 if (WARN_ON(intsize < 1))
782 *out_hwirq = intspec[0];
783 *out_type = IRQ_TYPE_NONE;
786 EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
789 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
791 * Device Tree IRQ specifier translation function which works with two cell
792 * bindings where the cell values map directly to the hwirq number
793 * and linux irq flags.
795 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
796 const u32 *intspec, unsigned int intsize,
797 irq_hw_number_t *out_hwirq, unsigned int *out_type)
799 if (WARN_ON(intsize < 2))
801 *out_hwirq = intspec[0];
802 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
805 EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
808 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
810 * Device Tree IRQ specifier translation function which works with either one
811 * or two cell bindings where the cell values map directly to the hwirq number
812 * and linux irq flags.
814 * Note: don't use this function unless your interrupt controller explicitly
815 * supports both one and two cell bindings. For the majority of controllers
816 * the _onecell() or _twocell() variants above should be used.
818 int irq_domain_xlate_onetwocell(struct irq_domain *d,
819 struct device_node *ctrlr,
820 const u32 *intspec, unsigned int intsize,
821 unsigned long *out_hwirq, unsigned int *out_type)
823 if (WARN_ON(intsize < 1))
825 *out_hwirq = intspec[0];
826 *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
829 EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
831 const struct irq_domain_ops irq_domain_simple_ops = {
832 .map = irq_domain_simple_map,
833 .xlate = irq_domain_xlate_onetwocell,
835 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
838 void irq_domain_generate_simple(const struct of_device_id *match,
839 u64 phys_base, unsigned int irq_start)
841 struct device_node *node;
842 pr_debug("looking for phys_base=%llx, irq_start=%i\n",
843 (unsigned long long) phys_base, (int) irq_start);
844 node = of_find_matching_node_by_address(NULL, match, phys_base);
846 irq_domain_add_legacy(node, 32, irq_start, 0,
847 &irq_domain_simple_ops, NULL);
849 EXPORT_SYMBOL_GPL(irq_domain_generate_simple);