blob: 4e69e24d3d7d94b4c895735765e06f2f47a95db0 [file] [log] [blame]
Paul Mundt54a90582012-05-19 15:11:47 +09001#define pr_fmt(fmt) "irq: " fmt
2
Grant Likelycc79ca62012-02-16 01:37:49 -07003#include <linux/debugfs.h>
4#include <linux/hardirq.h>
5#include <linux/interrupt.h>
Grant Likely08a543a2011-07-26 03:19:06 -06006#include <linux/irq.h>
Grant Likelycc79ca62012-02-16 01:37:49 -07007#include <linux/irqdesc.h>
Grant Likely08a543a2011-07-26 03:19:06 -06008#include <linux/irqdomain.h>
9#include <linux/module.h>
10#include <linux/mutex.h>
11#include <linux/of.h>
Grant Likely7e713302011-07-26 03:19:06 -060012#include <linux/of_address.h>
Paul Mundt5ca4db62012-06-03 22:04:34 -070013#include <linux/topology.h>
Grant Likelycc79ca62012-02-16 01:37:49 -070014#include <linux/seq_file.h>
Grant Likely7e713302011-07-26 03:19:06 -060015#include <linux/slab.h>
Grant Likelycc79ca62012-02-16 01:37:49 -070016#include <linux/smp.h>
17#include <linux/fs.h>
Grant Likely08a543a2011-07-26 03:19:06 -060018
Grant Likely1bc04f22012-02-14 14:06:55 -070019#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
20 * ie. legacy 8259, gets irqs 1..15 */
Grant Likelya8db8cf2012-02-14 14:06:54 -070021#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 */
24
Grant Likely08a543a2011-07-26 03:19:06 -060025static LIST_HEAD(irq_domain_list);
26static DEFINE_MUTEX(irq_domain_mutex);
27
Grant Likelycc79ca62012-02-16 01:37:49 -070028static DEFINE_MUTEX(revmap_trees_mutex);
Grant Likely68700652012-02-14 14:06:53 -070029static struct irq_domain *irq_default_domain;
Grant Likelycc79ca62012-02-16 01:37:49 -070030
Grant Likelycc79ca62012-02-16 01:37:49 -070031/**
Grant Likelya8db8cf2012-02-14 14:06:54 -070032 * irq_domain_alloc() - Allocate a new irq_domain data structure
Grant Likelycc79ca62012-02-16 01:37:49 -070033 * @of_node: optional device-tree node of the interrupt controller
34 * @revmap_type: type of reverse mapping to use
Grant Likely68700652012-02-14 14:06:53 -070035 * @ops: map/unmap domain callbacks
Grant Likelya8db8cf2012-02-14 14:06:54 -070036 * @host_data: Controller private data pointer
Grant Likelycc79ca62012-02-16 01:37:49 -070037 *
Grant Likelya8db8cf2012-02-14 14:06:54 -070038 * 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.
Grant Likelycc79ca62012-02-16 01:37:49 -070041 */
Grant Likelya8db8cf2012-02-14 14:06:54 -070042static struct irq_domain *irq_domain_alloc(struct device_node *of_node,
43 unsigned int revmap_type,
Grant Likelya18dc812012-01-26 12:12:14 -070044 const struct irq_domain_ops *ops,
Grant Likelya8db8cf2012-02-14 14:06:54 -070045 void *host_data)
Grant Likelycc79ca62012-02-16 01:37:49 -070046{
Grant Likelya8db8cf2012-02-14 14:06:54 -070047 struct irq_domain *domain;
Grant Likelycc79ca62012-02-16 01:37:49 -070048
Paul Mundt5ca4db62012-06-03 22:04:34 -070049 domain = kzalloc_node(sizeof(*domain), GFP_KERNEL,
50 of_node_to_nid(of_node));
Grant Likelya8db8cf2012-02-14 14:06:54 -070051 if (WARN_ON(!domain))
Grant Likelycc79ca62012-02-16 01:37:49 -070052 return NULL;
53
54 /* Fill structure */
Grant Likely68700652012-02-14 14:06:53 -070055 domain->revmap_type = revmap_type;
Grant Likely68700652012-02-14 14:06:53 -070056 domain->ops = ops;
Grant Likelya8db8cf2012-02-14 14:06:54 -070057 domain->host_data = host_data;
Grant Likely68700652012-02-14 14:06:53 -070058 domain->of_node = of_node_get(of_node);
Grant Likelycc79ca62012-02-16 01:37:49 -070059
Grant Likelya8db8cf2012-02-14 14:06:54 -070060 return domain;
61}
62
Paul Mundt58ee99a2012-05-19 15:11:41 +090063static void irq_domain_free(struct irq_domain *domain)
64{
65 of_node_put(domain->of_node);
66 kfree(domain);
67}
68
Grant Likelya8db8cf2012-02-14 14:06:54 -070069static void irq_domain_add(struct irq_domain *domain)
70{
71 mutex_lock(&irq_domain_mutex);
72 list_add(&domain->link, &irq_domain_list);
73 mutex_unlock(&irq_domain_mutex);
Paul Mundt54a90582012-05-19 15:11:47 +090074 pr_debug("Allocated domain of type %d @0x%p\n",
Grant Likelya8db8cf2012-02-14 14:06:54 -070075 domain->revmap_type, domain);
76}
77
Paul Mundt58ee99a2012-05-19 15:11:41 +090078/**
79 * irq_domain_remove() - Remove an irq domain.
80 * @domain: domain to remove
81 *
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.
85 */
86void irq_domain_remove(struct irq_domain *domain)
87{
88 mutex_lock(&irq_domain_mutex);
89
90 switch (domain->revmap_type) {
91 case IRQ_DOMAIN_MAP_LEGACY:
92 /*
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.
96 */
97 break;
98 case IRQ_DOMAIN_MAP_TREE:
99 /*
100 * radix_tree_delete() takes care of destroying the root
101 * node when all entries are removed. Shout if there are
102 * any mappings left.
103 */
104 WARN_ON(domain->revmap_data.tree.height);
105 break;
106 case IRQ_DOMAIN_MAP_LINEAR:
107 kfree(domain->revmap_data.linear.revmap);
108 domain->revmap_data.linear.size = 0;
109 break;
110 case IRQ_DOMAIN_MAP_NOMAP:
111 break;
112 }
113
114 list_del(&domain->link);
115
116 /*
117 * If the going away domain is the default one, reset it.
118 */
119 if (unlikely(irq_default_domain == domain))
120 irq_set_default_host(NULL);
121
122 mutex_unlock(&irq_domain_mutex);
123
Paul Mundt54a90582012-05-19 15:11:47 +0900124 pr_debug("Removed domain of type %d @0x%p\n",
Paul Mundt58ee99a2012-05-19 15:11:41 +0900125 domain->revmap_type, domain);
126
127 irq_domain_free(domain);
128}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900129EXPORT_SYMBOL_GPL(irq_domain_remove);
Paul Mundt58ee99a2012-05-19 15:11:41 +0900130
Grant Likely1bc04f22012-02-14 14:06:55 -0700131static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain,
132 irq_hw_number_t hwirq)
133{
134 irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq;
135 int size = domain->revmap_data.legacy.size;
136
137 if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size))
138 return 0;
139 return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq;
140}
141
Grant Likelya8db8cf2012-02-14 14:06:54 -0700142/**
Mark Brown781d0f42012-07-05 12:19:19 +0100143 * 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 * @ops: map/unmap domain callbacks
148 * @host_data: Controller private data pointer
149 *
150 * Allocates a legacy irq_domain if irq_base is positive or a linear
Linus Walleij2854d162012-09-27 14:59:39 +0200151 * domain otherwise. For the legacy domain, IRQ descriptors will also
152 * be allocated.
Mark Brown781d0f42012-07-05 12:19:19 +0100153 *
154 * This is intended to implement the expected behaviour for most
155 * interrupt controllers which is that a linear mapping should
156 * normally be used unless the system requires a legacy mapping in
157 * order to support supplying interrupt numbers during non-DT
158 * registration of devices.
159 */
160struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
161 unsigned int size,
162 unsigned int first_irq,
163 const struct irq_domain_ops *ops,
164 void *host_data)
165{
Linus Walleij2854d162012-09-27 14:59:39 +0200166 if (first_irq > 0) {
167 int irq_base;
168
169 if (IS_ENABLED(CONFIG_SPARSE_IRQ)) {
170 /*
171 * Set the descriptor allocator to search for a
172 * 1-to-1 mapping, such as irq_alloc_desc_at().
173 * Use of_node_to_nid() which is defined to
174 * numa_node_id() on platforms that have no custom
175 * implementation.
176 */
177 irq_base = irq_alloc_descs(first_irq, first_irq, size,
178 of_node_to_nid(of_node));
179 if (irq_base < 0) {
180 WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n",
181 first_irq);
182 irq_base = first_irq;
183 }
184 } else
185 irq_base = first_irq;
186
187 return irq_domain_add_legacy(of_node, size, irq_base, 0,
Mark Brown781d0f42012-07-05 12:19:19 +0100188 ops, host_data);
Linus Walleij2854d162012-09-27 14:59:39 +0200189 }
190
191 /* A linear domain is the default */
192 return irq_domain_add_linear(of_node, size, ops, host_data);
Mark Brown781d0f42012-07-05 12:19:19 +0100193}
194
195/**
Grant Likelya8db8cf2012-02-14 14:06:54 -0700196 * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain.
197 * @of_node: pointer to interrupt controller's device tree node.
Grant Likely1bc04f22012-02-14 14:06:55 -0700198 * @size: total number of irqs in legacy mapping
199 * @first_irq: first number of irq block assigned to the domain
200 * @first_hwirq: first hwirq number to use for the translation. Should normally
201 * be '0', but a positive integer can be used if the effective
202 * hwirqs numbering does not begin at zero.
Grant Likelya8db8cf2012-02-14 14:06:54 -0700203 * @ops: map/unmap domain callbacks
204 * @host_data: Controller private data pointer
205 *
206 * Note: the map() callback will be called before this function returns
207 * for all legacy interrupts except 0 (which is always the invalid irq for
208 * a legacy controller).
209 */
210struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
Grant Likely1bc04f22012-02-14 14:06:55 -0700211 unsigned int size,
212 unsigned int first_irq,
213 irq_hw_number_t first_hwirq,
Grant Likelya18dc812012-01-26 12:12:14 -0700214 const struct irq_domain_ops *ops,
Grant Likelya8db8cf2012-02-14 14:06:54 -0700215 void *host_data)
216{
Grant Likely1bc04f22012-02-14 14:06:55 -0700217 struct irq_domain *domain;
Grant Likelya8db8cf2012-02-14 14:06:54 -0700218 unsigned int i;
219
220 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data);
221 if (!domain)
222 return NULL;
223
Grant Likely1bc04f22012-02-14 14:06:55 -0700224 domain->revmap_data.legacy.first_irq = first_irq;
225 domain->revmap_data.legacy.first_hwirq = first_hwirq;
226 domain->revmap_data.legacy.size = size;
227
Grant Likelycc79ca62012-02-16 01:37:49 -0700228 mutex_lock(&irq_domain_mutex);
Grant Likely1bc04f22012-02-14 14:06:55 -0700229 /* Verify that all the irqs are available */
230 for (i = 0; i < size; i++) {
231 int irq = first_irq + i;
232 struct irq_data *irq_data = irq_get_irq_data(irq);
233
234 if (WARN_ON(!irq_data || irq_data->domain)) {
Grant Likelya8db8cf2012-02-14 14:06:54 -0700235 mutex_unlock(&irq_domain_mutex);
Paul Mundt58ee99a2012-05-19 15:11:41 +0900236 irq_domain_free(domain);
Grant Likelya8db8cf2012-02-14 14:06:54 -0700237 return NULL;
Grant Likelycc79ca62012-02-16 01:37:49 -0700238 }
239 }
Grant Likely1bc04f22012-02-14 14:06:55 -0700240
241 /* Claim all of the irqs before registering a legacy domain */
242 for (i = 0; i < size; i++) {
243 struct irq_data *irq_data = irq_get_irq_data(first_irq + i);
244 irq_data->hwirq = first_hwirq + i;
245 irq_data->domain = domain;
246 }
Grant Likelycc79ca62012-02-16 01:37:49 -0700247 mutex_unlock(&irq_domain_mutex);
248
Grant Likely1bc04f22012-02-14 14:06:55 -0700249 for (i = 0; i < size; i++) {
250 int irq = first_irq + i;
251 int hwirq = first_hwirq + i;
252
253 /* IRQ0 gets ignored */
254 if (!irq)
255 continue;
Grant Likelycc79ca62012-02-16 01:37:49 -0700256
Grant Likelya8db8cf2012-02-14 14:06:54 -0700257 /* Legacy flags are left to default at this point,
258 * one can then use irq_create_mapping() to
259 * explicitly change them
260 */
Grant Likelyaed98042012-06-03 22:04:39 -0700261 if (ops->map)
262 ops->map(domain, irq, hwirq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700263
Grant Likelya8db8cf2012-02-14 14:06:54 -0700264 /* Clear norequest flags */
Grant Likely1bc04f22012-02-14 14:06:55 -0700265 irq_clear_status_flags(irq, IRQ_NOREQUEST);
Grant Likelycc79ca62012-02-16 01:37:49 -0700266 }
Grant Likely1bc04f22012-02-14 14:06:55 -0700267
268 irq_domain_add(domain);
Grant Likelya8db8cf2012-02-14 14:06:54 -0700269 return domain;
270}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900271EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
Grant Likelycc79ca62012-02-16 01:37:49 -0700272
Grant Likelya8db8cf2012-02-14 14:06:54 -0700273/**
Dong Aisheng22076c72012-06-20 17:00:30 +0800274 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
Grant Likelya8db8cf2012-02-14 14:06:54 -0700275 * @of_node: pointer to interrupt controller's device tree node.
Mark Browna87487e2012-05-19 12:15:35 +0100276 * @size: Number of interrupts in the domain.
Grant Likelya8db8cf2012-02-14 14:06:54 -0700277 * @ops: map/unmap domain callbacks
278 * @host_data: Controller private data pointer
279 */
280struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
281 unsigned int size,
Grant Likelya18dc812012-01-26 12:12:14 -0700282 const struct irq_domain_ops *ops,
Grant Likelya8db8cf2012-02-14 14:06:54 -0700283 void *host_data)
284{
285 struct irq_domain *domain;
286 unsigned int *revmap;
Grant Likelycc79ca62012-02-16 01:37:49 -0700287
Paul Mundt5ca4db62012-06-03 22:04:34 -0700288 revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL,
289 of_node_to_nid(of_node));
Grant Likelya8db8cf2012-02-14 14:06:54 -0700290 if (WARN_ON(!revmap))
291 return NULL;
292
293 domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data);
294 if (!domain) {
295 kfree(revmap);
296 return NULL;
297 }
298 domain->revmap_data.linear.size = size;
299 domain->revmap_data.linear.revmap = revmap;
300 irq_domain_add(domain);
301 return domain;
302}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900303EXPORT_SYMBOL_GPL(irq_domain_add_linear);
Grant Likelya8db8cf2012-02-14 14:06:54 -0700304
305struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
Grant Likely6fa6c8e22012-02-15 15:06:08 -0700306 unsigned int max_irq,
Grant Likelya18dc812012-01-26 12:12:14 -0700307 const struct irq_domain_ops *ops,
Grant Likelya8db8cf2012-02-14 14:06:54 -0700308 void *host_data)
309{
310 struct irq_domain *domain = irq_domain_alloc(of_node,
311 IRQ_DOMAIN_MAP_NOMAP, ops, host_data);
Grant Likely6fa6c8e22012-02-15 15:06:08 -0700312 if (domain) {
313 domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0;
Grant Likelya8db8cf2012-02-14 14:06:54 -0700314 irq_domain_add(domain);
Grant Likely6fa6c8e22012-02-15 15:06:08 -0700315 }
Grant Likelya8db8cf2012-02-14 14:06:54 -0700316 return domain;
317}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900318EXPORT_SYMBOL_GPL(irq_domain_add_nomap);
Grant Likelya8db8cf2012-02-14 14:06:54 -0700319
320/**
321 * irq_domain_add_tree()
322 * @of_node: pointer to interrupt controller's device tree node.
323 * @ops: map/unmap domain callbacks
324 *
325 * Note: The radix tree will be allocated later during boot automatically
326 * (the reverse mapping will use the slow path until that happens).
327 */
328struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
Grant Likelya18dc812012-01-26 12:12:14 -0700329 const struct irq_domain_ops *ops,
Grant Likelya8db8cf2012-02-14 14:06:54 -0700330 void *host_data)
331{
332 struct irq_domain *domain = irq_domain_alloc(of_node,
333 IRQ_DOMAIN_MAP_TREE, ops, host_data);
334 if (domain) {
335 INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL);
336 irq_domain_add(domain);
337 }
Grant Likely68700652012-02-14 14:06:53 -0700338 return domain;
Grant Likelycc79ca62012-02-16 01:37:49 -0700339}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900340EXPORT_SYMBOL_GPL(irq_domain_add_tree);
Grant Likelycc79ca62012-02-16 01:37:49 -0700341
342/**
343 * irq_find_host() - Locates a domain for a given device node
344 * @node: device-tree node of the interrupt controller
345 */
346struct irq_domain *irq_find_host(struct device_node *node)
347{
348 struct irq_domain *h, *found = NULL;
Grant Likelya18dc812012-01-26 12:12:14 -0700349 int rc;
Grant Likelycc79ca62012-02-16 01:37:49 -0700350
351 /* We might want to match the legacy controller last since
352 * it might potentially be set to match all interrupts in
353 * the absence of a device node. This isn't a problem so far
354 * yet though...
355 */
356 mutex_lock(&irq_domain_mutex);
Grant Likelya18dc812012-01-26 12:12:14 -0700357 list_for_each_entry(h, &irq_domain_list, link) {
358 if (h->ops->match)
359 rc = h->ops->match(h, node);
360 else
361 rc = (h->of_node != NULL) && (h->of_node == node);
362
363 if (rc) {
Grant Likelycc79ca62012-02-16 01:37:49 -0700364 found = h;
365 break;
366 }
Grant Likelya18dc812012-01-26 12:12:14 -0700367 }
Grant Likelycc79ca62012-02-16 01:37:49 -0700368 mutex_unlock(&irq_domain_mutex);
369 return found;
370}
371EXPORT_SYMBOL_GPL(irq_find_host);
372
373/**
374 * irq_set_default_host() - Set a "default" irq domain
Grant Likely68700652012-02-14 14:06:53 -0700375 * @domain: default domain pointer
Grant Likelycc79ca62012-02-16 01:37:49 -0700376 *
377 * For convenience, it's possible to set a "default" domain that will be used
378 * whenever NULL is passed to irq_create_mapping(). It makes life easier for
379 * platforms that want to manipulate a few hard coded interrupt numbers that
380 * aren't properly represented in the device-tree.
381 */
Grant Likely68700652012-02-14 14:06:53 -0700382void irq_set_default_host(struct irq_domain *domain)
Grant Likelycc79ca62012-02-16 01:37:49 -0700383{
Paul Mundt54a90582012-05-19 15:11:47 +0900384 pr_debug("Default domain set to @0x%p\n", domain);
Grant Likelycc79ca62012-02-16 01:37:49 -0700385
Grant Likely68700652012-02-14 14:06:53 -0700386 irq_default_domain = domain;
Grant Likelycc79ca62012-02-16 01:37:49 -0700387}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900388EXPORT_SYMBOL_GPL(irq_set_default_host);
Grant Likelycc79ca62012-02-16 01:37:49 -0700389
Grant Likely913af202012-06-03 22:04:35 -0700390static void irq_domain_disassociate_many(struct irq_domain *domain,
391 unsigned int irq_base, int count)
392{
393 /*
394 * disassociate in reverse order;
395 * not strictly necessary, but nice for unwinding
396 */
397 while (count--) {
398 int irq = irq_base + count;
399 struct irq_data *irq_data = irq_get_irq_data(irq);
400 irq_hw_number_t hwirq = irq_data->hwirq;
401
402 if (WARN_ON(!irq_data || irq_data->domain != domain))
403 continue;
404
405 irq_set_status_flags(irq, IRQ_NOREQUEST);
406
407 /* remove chip and handler */
408 irq_set_chip_and_handler(irq, NULL, NULL);
409
410 /* Make sure it's completed */
411 synchronize_irq(irq);
412
413 /* Tell the PIC about it */
414 if (domain->ops->unmap)
415 domain->ops->unmap(domain, irq);
416 smp_mb();
417
418 irq_data->domain = NULL;
419 irq_data->hwirq = 0;
420
421 /* Clear reverse map */
422 switch(domain->revmap_type) {
423 case IRQ_DOMAIN_MAP_LINEAR:
424 if (hwirq < domain->revmap_data.linear.size)
425 domain->revmap_data.linear.revmap[hwirq] = 0;
426 break;
427 case IRQ_DOMAIN_MAP_TREE:
428 mutex_lock(&revmap_trees_mutex);
429 radix_tree_delete(&domain->revmap_data.tree, hwirq);
430 mutex_unlock(&revmap_trees_mutex);
431 break;
432 }
433 }
434}
435
Grant Likely98aa4682012-06-17 16:17:04 -0600436int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base,
437 irq_hw_number_t hwirq_base, int count)
Grant Likelycc79ca62012-02-16 01:37:49 -0700438{
Grant Likely98aa4682012-06-17 16:17:04 -0600439 unsigned int virq = irq_base;
440 irq_hw_number_t hwirq = hwirq_base;
Mark Brownf5a1ad02012-07-20 10:33:19 +0100441 int i, ret;
Grant Likelycc79ca62012-02-16 01:37:49 -0700442
Grant Likely98aa4682012-06-17 16:17:04 -0600443 pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__,
444 of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count);
445
446 for (i = 0; i < count; i++) {
447 struct irq_data *irq_data = irq_get_irq_data(virq + i);
448
449 if (WARN(!irq_data, "error: irq_desc not allocated; "
450 "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
451 return -EINVAL;
452 if (WARN(irq_data->domain, "error: irq_desc already associated; "
453 "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i))
454 return -EINVAL;
455 };
456
457 for (i = 0; i < count; i++, virq++, hwirq++) {
458 struct irq_data *irq_data = irq_get_irq_data(virq);
459
460 irq_data->hwirq = hwirq;
461 irq_data->domain = domain;
Mark Brownf5a1ad02012-07-20 10:33:19 +0100462 if (domain->ops->map) {
463 ret = domain->ops->map(domain, virq, hwirq);
464 if (ret != 0) {
465 pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n",
466 virq, hwirq, ret);
467 WARN_ON(1);
468 irq_data->domain = NULL;
469 irq_data->hwirq = 0;
470 goto err_unmap;
471 }
Grant Likely98aa4682012-06-17 16:17:04 -0600472 }
473
474 switch (domain->revmap_type) {
475 case IRQ_DOMAIN_MAP_LINEAR:
476 if (hwirq < domain->revmap_data.linear.size)
477 domain->revmap_data.linear.revmap[hwirq] = virq;
478 break;
479 case IRQ_DOMAIN_MAP_TREE:
480 mutex_lock(&revmap_trees_mutex);
Grant Likelyd6b0d1f2012-06-03 22:04:37 -0700481 radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data);
Grant Likely98aa4682012-06-17 16:17:04 -0600482 mutex_unlock(&revmap_trees_mutex);
483 break;
484 }
485
486 irq_clear_status_flags(virq, IRQ_NOREQUEST);
Grant Likelycc79ca62012-02-16 01:37:49 -0700487 }
488
Grant Likelycc79ca62012-02-16 01:37:49 -0700489 return 0;
Grant Likely98aa4682012-06-17 16:17:04 -0600490
491 err_unmap:
492 irq_domain_disassociate_many(domain, irq_base, i);
493 return -EINVAL;
Grant Likelycc79ca62012-02-16 01:37:49 -0700494}
Grant Likely98aa4682012-06-17 16:17:04 -0600495EXPORT_SYMBOL_GPL(irq_domain_associate_many);
Grant Likelycc79ca62012-02-16 01:37:49 -0700496
497/**
498 * irq_create_direct_mapping() - Allocate an irq for direct mapping
Grant Likely68700652012-02-14 14:06:53 -0700499 * @domain: domain to allocate the irq for or NULL for default domain
Grant Likelycc79ca62012-02-16 01:37:49 -0700500 *
501 * This routine is used for irq controllers which can choose the hardware
502 * interrupt numbers they generate. In such a case it's simplest to use
503 * the linux irq as the hardware interrupt number.
504 */
Grant Likely68700652012-02-14 14:06:53 -0700505unsigned int irq_create_direct_mapping(struct irq_domain *domain)
Grant Likelycc79ca62012-02-16 01:37:49 -0700506{
507 unsigned int virq;
508
Grant Likely68700652012-02-14 14:06:53 -0700509 if (domain == NULL)
510 domain = irq_default_domain;
Grant Likelycc79ca62012-02-16 01:37:49 -0700511
Grant Likely9844a552012-06-03 22:04:38 -0700512 if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP))
513 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700514
Paul Mundt5ca4db62012-06-03 22:04:34 -0700515 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
Grant Likely03848372012-02-14 14:06:52 -0700516 if (!virq) {
Paul Mundt54a90582012-05-19 15:11:47 +0900517 pr_debug("create_direct virq allocation failed\n");
Grant Likely03848372012-02-14 14:06:52 -0700518 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700519 }
Grant Likely6fa6c8e22012-02-15 15:06:08 -0700520 if (virq >= domain->revmap_data.nomap.max_irq) {
Grant Likelycc79ca62012-02-16 01:37:49 -0700521 pr_err("ERROR: no free irqs available below %i maximum\n",
Grant Likely6fa6c8e22012-02-15 15:06:08 -0700522 domain->revmap_data.nomap.max_irq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700523 irq_free_desc(virq);
524 return 0;
525 }
Paul Mundt54a90582012-05-19 15:11:47 +0900526 pr_debug("create_direct obtained virq %d\n", virq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700527
Grant Likely98aa4682012-06-17 16:17:04 -0600528 if (irq_domain_associate(domain, virq, virq)) {
Grant Likelycc79ca62012-02-16 01:37:49 -0700529 irq_free_desc(virq);
Grant Likely03848372012-02-14 14:06:52 -0700530 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700531 }
532
533 return virq;
534}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900535EXPORT_SYMBOL_GPL(irq_create_direct_mapping);
Grant Likelycc79ca62012-02-16 01:37:49 -0700536
537/**
538 * irq_create_mapping() - Map a hardware interrupt into linux irq space
Grant Likely68700652012-02-14 14:06:53 -0700539 * @domain: domain owning this hardware interrupt or NULL for default domain
540 * @hwirq: hardware irq number in that domain space
Grant Likelycc79ca62012-02-16 01:37:49 -0700541 *
542 * Only one mapping per hardware interrupt is permitted. Returns a linux
543 * irq number.
544 * If the sense/trigger is to be specified, set_irq_type() should be called
545 * on the number returned from that call.
546 */
Grant Likely68700652012-02-14 14:06:53 -0700547unsigned int irq_create_mapping(struct irq_domain *domain,
Grant Likelycc79ca62012-02-16 01:37:49 -0700548 irq_hw_number_t hwirq)
549{
David Daney5b7526e2012-04-05 16:52:13 -0700550 unsigned int hint;
551 int virq;
Grant Likelycc79ca62012-02-16 01:37:49 -0700552
Paul Mundt54a90582012-05-19 15:11:47 +0900553 pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700554
Grant Likely68700652012-02-14 14:06:53 -0700555 /* Look for default domain if nececssary */
556 if (domain == NULL)
557 domain = irq_default_domain;
558 if (domain == NULL) {
Paul Mundt54a90582012-05-19 15:11:47 +0900559 pr_warning("irq_create_mapping called for"
560 " NULL domain, hwirq=%lx\n", hwirq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700561 WARN_ON(1);
Grant Likely03848372012-02-14 14:06:52 -0700562 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700563 }
Paul Mundt54a90582012-05-19 15:11:47 +0900564 pr_debug("-> using domain @%p\n", domain);
Grant Likelycc79ca62012-02-16 01:37:49 -0700565
566 /* Check if mapping already exists */
Grant Likely68700652012-02-14 14:06:53 -0700567 virq = irq_find_mapping(domain, hwirq);
Grant Likely03848372012-02-14 14:06:52 -0700568 if (virq) {
Paul Mundt54a90582012-05-19 15:11:47 +0900569 pr_debug("-> existing mapping on virq %d\n", virq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700570 return virq;
571 }
572
573 /* Get a virtual interrupt number */
Grant Likely1bc04f22012-02-14 14:06:55 -0700574 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
575 return irq_domain_legacy_revmap(domain, hwirq);
576
577 /* Allocate a virtual interrupt number */
Grant Likely6fa6c8e22012-02-15 15:06:08 -0700578 hint = hwirq % nr_irqs;
Grant Likely1bc04f22012-02-14 14:06:55 -0700579 if (hint == 0)
580 hint++;
Paul Mundt5ca4db62012-06-03 22:04:34 -0700581 virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node));
David Daney5b7526e2012-04-05 16:52:13 -0700582 if (virq <= 0)
Paul Mundt5ca4db62012-06-03 22:04:34 -0700583 virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node));
David Daney5b7526e2012-04-05 16:52:13 -0700584 if (virq <= 0) {
Paul Mundt54a90582012-05-19 15:11:47 +0900585 pr_debug("-> virq allocation failed\n");
Grant Likely1bc04f22012-02-14 14:06:55 -0700586 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700587 }
588
Grant Likely98aa4682012-06-17 16:17:04 -0600589 if (irq_domain_associate(domain, virq, hwirq)) {
Grant Likely73255702012-06-03 22:04:35 -0700590 irq_free_desc(virq);
Grant Likely03848372012-02-14 14:06:52 -0700591 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700592 }
593
Paul Mundt54a90582012-05-19 15:11:47 +0900594 pr_debug("irq %lu on domain %s mapped to virtual irq %u\n",
Grant Likelyefd68e72012-06-03 22:04:33 -0700595 hwirq, of_node_full_name(domain->of_node), virq);
Grant Likelycc79ca62012-02-16 01:37:49 -0700596
597 return virq;
598}
599EXPORT_SYMBOL_GPL(irq_create_mapping);
600
Grant Likely98aa4682012-06-17 16:17:04 -0600601/**
602 * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs
603 * @domain: domain owning the interrupt range
604 * @irq_base: beginning of linux IRQ range
605 * @hwirq_base: beginning of hardware IRQ range
606 * @count: Number of interrupts to map
607 *
608 * This routine is used for allocating and mapping a range of hardware
609 * irqs to linux irqs where the linux irq numbers are at pre-defined
610 * locations. For use by controllers that already have static mappings
611 * to insert in to the domain.
612 *
613 * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time
614 * domain insertion.
615 *
616 * 0 is returned upon success, while any failure to establish a static
617 * mapping is treated as an error.
618 */
619int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base,
620 irq_hw_number_t hwirq_base, int count)
621{
622 int ret;
623
624 ret = irq_alloc_descs(irq_base, irq_base, count,
625 of_node_to_nid(domain->of_node));
626 if (unlikely(ret < 0))
627 return ret;
628
629 ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count);
630 if (unlikely(ret < 0)) {
631 irq_free_descs(irq_base, count);
632 return ret;
633 }
634
635 return 0;
636}
637EXPORT_SYMBOL_GPL(irq_create_strict_mappings);
638
Grant Likelycc79ca62012-02-16 01:37:49 -0700639unsigned int irq_create_of_mapping(struct device_node *controller,
640 const u32 *intspec, unsigned int intsize)
641{
Grant Likely68700652012-02-14 14:06:53 -0700642 struct irq_domain *domain;
Grant Likelycc79ca62012-02-16 01:37:49 -0700643 irq_hw_number_t hwirq;
644 unsigned int type = IRQ_TYPE_NONE;
645 unsigned int virq;
646
Grant Likely68700652012-02-14 14:06:53 -0700647 domain = controller ? irq_find_host(controller) : irq_default_domain;
648 if (!domain) {
Grant Likelyabd23632012-02-24 08:07:06 -0700649#ifdef CONFIG_MIPS
650 /*
651 * Workaround to avoid breaking interrupt controller drivers
652 * that don't yet register an irq_domain. This is temporary
653 * code. ~~~gcl, Feb 24, 2012
654 *
655 * Scheduled for removal in Linux v3.6. That should be enough
656 * time.
657 */
658 if (intsize > 0)
659 return intspec[0];
660#endif
Paul Mundt54a90582012-05-19 15:11:47 +0900661 pr_warning("no irq domain found for %s !\n",
Grant Likelyefd68e72012-06-03 22:04:33 -0700662 of_node_full_name(controller));
Grant Likely03848372012-02-14 14:06:52 -0700663 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700664 }
665
Grant Likely68700652012-02-14 14:06:53 -0700666 /* If domain has no translation, then we assume interrupt line */
667 if (domain->ops->xlate == NULL)
Grant Likelycc79ca62012-02-16 01:37:49 -0700668 hwirq = intspec[0];
669 else {
Grant Likely68700652012-02-14 14:06:53 -0700670 if (domain->ops->xlate(domain, controller, intspec, intsize,
Grant Likelycc79ca62012-02-16 01:37:49 -0700671 &hwirq, &type))
Grant Likely03848372012-02-14 14:06:52 -0700672 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700673 }
674
675 /* Create mapping */
Grant Likely68700652012-02-14 14:06:53 -0700676 virq = irq_create_mapping(domain, hwirq);
Grant Likely03848372012-02-14 14:06:52 -0700677 if (!virq)
Grant Likelycc79ca62012-02-16 01:37:49 -0700678 return virq;
679
680 /* Set type if specified and different than the current one */
681 if (type != IRQ_TYPE_NONE &&
682 type != (irqd_get_trigger_type(irq_get_irq_data(virq))))
683 irq_set_irq_type(virq, type);
684 return virq;
685}
686EXPORT_SYMBOL_GPL(irq_create_of_mapping);
687
688/**
689 * irq_dispose_mapping() - Unmap an interrupt
690 * @virq: linux irq number of the interrupt to unmap
691 */
692void irq_dispose_mapping(unsigned int virq)
693{
694 struct irq_data *irq_data = irq_get_irq_data(virq);
Grant Likely68700652012-02-14 14:06:53 -0700695 struct irq_domain *domain;
Grant Likelycc79ca62012-02-16 01:37:49 -0700696
Grant Likely03848372012-02-14 14:06:52 -0700697 if (!virq || !irq_data)
Grant Likelycc79ca62012-02-16 01:37:49 -0700698 return;
699
Grant Likely68700652012-02-14 14:06:53 -0700700 domain = irq_data->domain;
701 if (WARN_ON(domain == NULL))
Grant Likelycc79ca62012-02-16 01:37:49 -0700702 return;
703
704 /* Never unmap legacy interrupts */
Grant Likely68700652012-02-14 14:06:53 -0700705 if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY)
Grant Likelycc79ca62012-02-16 01:37:49 -0700706 return;
707
Grant Likely913af202012-06-03 22:04:35 -0700708 irq_domain_disassociate_many(domain, virq, 1);
Grant Likelycc79ca62012-02-16 01:37:49 -0700709 irq_free_desc(virq);
710}
711EXPORT_SYMBOL_GPL(irq_dispose_mapping);
712
713/**
714 * irq_find_mapping() - Find a linux irq from an hw irq number.
Grant Likely68700652012-02-14 14:06:53 -0700715 * @domain: domain owning this hardware interrupt
716 * @hwirq: hardware irq number in that domain space
Grant Likelycc79ca62012-02-16 01:37:49 -0700717 */
Grant Likely68700652012-02-14 14:06:53 -0700718unsigned int irq_find_mapping(struct irq_domain *domain,
Grant Likelycc79ca62012-02-16 01:37:49 -0700719 irq_hw_number_t hwirq)
720{
Grant Likely4c0946c2012-06-03 22:04:39 -0700721 struct irq_data *data;
Grant Likelycc79ca62012-02-16 01:37:49 -0700722
Grant Likely68700652012-02-14 14:06:53 -0700723 /* Look for default domain if nececssary */
724 if (domain == NULL)
725 domain = irq_default_domain;
726 if (domain == NULL)
Grant Likely03848372012-02-14 14:06:52 -0700727 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700728
Grant Likely4c0946c2012-06-03 22:04:39 -0700729 switch (domain->revmap_type) {
730 case IRQ_DOMAIN_MAP_LEGACY:
Grant Likely1bc04f22012-02-14 14:06:55 -0700731 return irq_domain_legacy_revmap(domain, hwirq);
Grant Likely4c0946c2012-06-03 22:04:39 -0700732 case IRQ_DOMAIN_MAP_LINEAR:
733 return irq_linear_revmap(domain, hwirq);
734 case IRQ_DOMAIN_MAP_TREE:
735 rcu_read_lock();
736 data = radix_tree_lookup(&domain->revmap_data.tree, hwirq);
737 rcu_read_unlock();
738 if (data)
739 return data->irq;
740 break;
741 case IRQ_DOMAIN_MAP_NOMAP:
742 data = irq_get_irq_data(hwirq);
Grant Likely68700652012-02-14 14:06:53 -0700743 if (data && (data->domain == domain) && (data->hwirq == hwirq))
Grant Likely4c0946c2012-06-03 22:04:39 -0700744 return hwirq;
745 break;
746 }
747
Grant Likely03848372012-02-14 14:06:52 -0700748 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700749}
750EXPORT_SYMBOL_GPL(irq_find_mapping);
751
752/**
Grant Likelycc79ca62012-02-16 01:37:49 -0700753 * irq_linear_revmap() - Find a linux irq from a hw irq number.
Grant Likely68700652012-02-14 14:06:53 -0700754 * @domain: domain owning this hardware interrupt
755 * @hwirq: hardware irq number in that domain space
Grant Likelycc79ca62012-02-16 01:37:49 -0700756 *
Grant Likely4c0946c2012-06-03 22:04:39 -0700757 * This is a fast path that can be called directly by irq controller code to
758 * save a handful of instructions.
Grant Likelycc79ca62012-02-16 01:37:49 -0700759 */
Grant Likely68700652012-02-14 14:06:53 -0700760unsigned int irq_linear_revmap(struct irq_domain *domain,
Grant Likelycc79ca62012-02-16 01:37:49 -0700761 irq_hw_number_t hwirq)
762{
Grant Likely4c0946c2012-06-03 22:04:39 -0700763 BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR);
Grant Likelycc79ca62012-02-16 01:37:49 -0700764
Grant Likely4c0946c2012-06-03 22:04:39 -0700765 /* Check revmap bounds; complain if exceeded */
766 if (WARN_ON(hwirq >= domain->revmap_data.linear.size))
767 return 0;
Grant Likelycc79ca62012-02-16 01:37:49 -0700768
Grant Likely4c0946c2012-06-03 22:04:39 -0700769 return domain->revmap_data.linear.revmap[hwirq];
Grant Likelycc79ca62012-02-16 01:37:49 -0700770}
Paul Mundtecd84eb2012-05-19 15:11:42 +0900771EXPORT_SYMBOL_GPL(irq_linear_revmap);
Grant Likelycc79ca62012-02-16 01:37:49 -0700772
Grant Likely092b2fb2012-03-29 14:10:30 -0600773#ifdef CONFIG_IRQ_DOMAIN_DEBUG
Grant Likelycc79ca62012-02-16 01:37:49 -0700774static int virq_debug_show(struct seq_file *m, void *private)
775{
776 unsigned long flags;
777 struct irq_desc *desc;
778 const char *p;
779 static const char none[] = "none";
780 void *data;
781 int i;
782
Grant Likely15e06bf2012-04-11 00:26:25 -0600783 seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq",
Grant Likely5269a9a2012-04-12 14:42:15 -0600784 "chip name", (int)(2 * sizeof(void *) + 2), "chip data",
785 "domain name");
Grant Likelycc79ca62012-02-16 01:37:49 -0700786
787 for (i = 1; i < nr_irqs; i++) {
788 desc = irq_to_desc(i);
789 if (!desc)
790 continue;
791
792 raw_spin_lock_irqsave(&desc->lock, flags);
793
794 if (desc->action && desc->action->handler) {
795 struct irq_chip *chip;
796
797 seq_printf(m, "%5d ", i);
798 seq_printf(m, "0x%05lx ", desc->irq_data.hwirq);
799
800 chip = irq_desc_get_chip(desc);
801 if (chip && chip->name)
802 p = chip->name;
803 else
804 p = none;
805 seq_printf(m, "%-15s ", p);
806
807 data = irq_desc_get_chip_data(desc);
Grant Likely15e06bf2012-04-11 00:26:25 -0600808 seq_printf(m, data ? "0x%p " : " %p ", data);
Grant Likelycc79ca62012-02-16 01:37:49 -0700809
Grant Likelyefd68e72012-06-03 22:04:33 -0700810 if (desc->irq_data.domain)
811 p = of_node_full_name(desc->irq_data.domain->of_node);
Grant Likelycc79ca62012-02-16 01:37:49 -0700812 else
813 p = none;
814 seq_printf(m, "%s\n", p);
815 }
816
817 raw_spin_unlock_irqrestore(&desc->lock, flags);
818 }
819
820 return 0;
821}
822
823static int virq_debug_open(struct inode *inode, struct file *file)
824{
825 return single_open(file, virq_debug_show, inode->i_private);
826}
827
828static const struct file_operations virq_debug_fops = {
829 .open = virq_debug_open,
830 .read = seq_read,
831 .llseek = seq_lseek,
832 .release = single_release,
833};
834
835static int __init irq_debugfs_init(void)
836{
Grant Likely092b2fb2012-03-29 14:10:30 -0600837 if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL,
Grant Likelycc79ca62012-02-16 01:37:49 -0700838 NULL, &virq_debug_fops) == NULL)
839 return -ENOMEM;
840
841 return 0;
842}
843__initcall(irq_debugfs_init);
Grant Likely092b2fb2012-03-29 14:10:30 -0600844#endif /* CONFIG_IRQ_DOMAIN_DEBUG */
Grant Likelycc79ca62012-02-16 01:37:49 -0700845
Grant Likely16b2e6e2012-01-26 11:26:52 -0700846/**
847 * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings
848 *
849 * Device Tree IRQ specifier translation function which works with one cell
850 * bindings where the cell value maps directly to the hwirq number.
851 */
852int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
853 const u32 *intspec, unsigned int intsize,
854 unsigned long *out_hwirq, unsigned int *out_type)
Grant Likely7e713302011-07-26 03:19:06 -0600855{
Grant Likely16b2e6e2012-01-26 11:26:52 -0700856 if (WARN_ON(intsize < 1))
Grant Likely7e713302011-07-26 03:19:06 -0600857 return -EINVAL;
Grant Likely7e713302011-07-26 03:19:06 -0600858 *out_hwirq = intspec[0];
859 *out_type = IRQ_TYPE_NONE;
Grant Likely7e713302011-07-26 03:19:06 -0600860 return 0;
861}
Grant Likely16b2e6e2012-01-26 11:26:52 -0700862EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell);
863
864/**
865 * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings
866 *
867 * Device Tree IRQ specifier translation function which works with two cell
868 * bindings where the cell values map directly to the hwirq number
869 * and linux irq flags.
870 */
871int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
872 const u32 *intspec, unsigned int intsize,
873 irq_hw_number_t *out_hwirq, unsigned int *out_type)
874{
875 if (WARN_ON(intsize < 2))
876 return -EINVAL;
877 *out_hwirq = intspec[0];
878 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
879 return 0;
880}
881EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell);
882
883/**
884 * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings
885 *
886 * Device Tree IRQ specifier translation function which works with either one
887 * or two cell bindings where the cell values map directly to the hwirq number
888 * and linux irq flags.
889 *
890 * Note: don't use this function unless your interrupt controller explicitly
891 * supports both one and two cell bindings. For the majority of controllers
892 * the _onecell() or _twocell() variants above should be used.
893 */
894int irq_domain_xlate_onetwocell(struct irq_domain *d,
895 struct device_node *ctrlr,
896 const u32 *intspec, unsigned int intsize,
897 unsigned long *out_hwirq, unsigned int *out_type)
898{
899 if (WARN_ON(intsize < 1))
900 return -EINVAL;
901 *out_hwirq = intspec[0];
902 *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE;
903 return 0;
904}
905EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell);
Grant Likely7e713302011-07-26 03:19:06 -0600906
Grant Likelya18dc812012-01-26 12:12:14 -0700907const struct irq_domain_ops irq_domain_simple_ops = {
Grant Likely16b2e6e2012-01-26 11:26:52 -0700908 .xlate = irq_domain_xlate_onetwocell,
Grant Likely75294952012-02-14 14:06:57 -0700909};
910EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
911
912#ifdef CONFIG_OF_IRQ
Grant Likely7e713302011-07-26 03:19:06 -0600913void irq_domain_generate_simple(const struct of_device_id *match,
914 u64 phys_base, unsigned int irq_start)
915{
916 struct device_node *node;
Grant Likelye1964c52012-02-14 14:06:48 -0700917 pr_debug("looking for phys_base=%llx, irq_start=%i\n",
Grant Likely7e713302011-07-26 03:19:06 -0600918 (unsigned long long) phys_base, (int) irq_start);
919 node = of_find_matching_node_by_address(NULL, match, phys_base);
920 if (node)
Grant Likely6b783f72012-01-10 17:09:30 -0700921 irq_domain_add_legacy(node, 32, irq_start, 0,
922 &irq_domain_simple_ops, NULL);
Grant Likely7e713302011-07-26 03:19:06 -0600923}
924EXPORT_SYMBOL_GPL(irq_domain_generate_simple);
Grant Likely75294952012-02-14 14:06:57 -0700925#endif