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Commit | Line | Data |
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54a90588 PM |
1 | #define pr_fmt(fmt) "irq: " fmt |
2 | ||
cc79ca69 GL |
3 | #include <linux/debugfs.h> |
4 | #include <linux/hardirq.h> | |
5 | #include <linux/interrupt.h> | |
08a543ad | 6 | #include <linux/irq.h> |
cc79ca69 | 7 | #include <linux/irqdesc.h> |
08a543ad GL |
8 | #include <linux/irqdomain.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/mutex.h> | |
11 | #include <linux/of.h> | |
7e713301 | 12 | #include <linux/of_address.h> |
5ca4db61 | 13 | #include <linux/topology.h> |
cc79ca69 | 14 | #include <linux/seq_file.h> |
7e713301 | 15 | #include <linux/slab.h> |
cc79ca69 GL |
16 | #include <linux/smp.h> |
17 | #include <linux/fs.h> | |
08a543ad | 18 | |
1bc04f2c GL |
19 | #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs. |
20 | * ie. legacy 8259, gets irqs 1..15 */ | |
a8db8cf0 GL |
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 */ | |
24 | ||
08a543ad GL |
25 | static LIST_HEAD(irq_domain_list); |
26 | static DEFINE_MUTEX(irq_domain_mutex); | |
27 | ||
cc79ca69 | 28 | static DEFINE_MUTEX(revmap_trees_mutex); |
68700650 | 29 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 30 | |
cc79ca69 | 31 | /** |
a8db8cf0 | 32 | * irq_domain_alloc() - Allocate a new irq_domain data structure |
cc79ca69 GL |
33 | * @of_node: optional device-tree node of the interrupt controller |
34 | * @revmap_type: type of reverse mapping to use | |
68700650 | 35 | * @ops: map/unmap domain callbacks |
a8db8cf0 | 36 | * @host_data: Controller private data pointer |
cc79ca69 | 37 | * |
a8db8cf0 GL |
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. | |
cc79ca69 | 41 | */ |
a8db8cf0 GL |
42 | static struct irq_domain *irq_domain_alloc(struct device_node *of_node, |
43 | unsigned int revmap_type, | |
a18dc81b | 44 | const struct irq_domain_ops *ops, |
a8db8cf0 | 45 | void *host_data) |
cc79ca69 | 46 | { |
a8db8cf0 | 47 | struct irq_domain *domain; |
cc79ca69 | 48 | |
5ca4db61 PM |
49 | domain = kzalloc_node(sizeof(*domain), GFP_KERNEL, |
50 | of_node_to_nid(of_node)); | |
a8db8cf0 | 51 | if (WARN_ON(!domain)) |
cc79ca69 GL |
52 | return NULL; |
53 | ||
54 | /* Fill structure */ | |
68700650 | 55 | domain->revmap_type = revmap_type; |
68700650 | 56 | domain->ops = ops; |
a8db8cf0 | 57 | domain->host_data = host_data; |
68700650 | 58 | domain->of_node = of_node_get(of_node); |
cc79ca69 | 59 | |
a8db8cf0 GL |
60 | return domain; |
61 | } | |
62 | ||
58ee99ad PM |
63 | static void irq_domain_free(struct irq_domain *domain) |
64 | { | |
65 | of_node_put(domain->of_node); | |
66 | kfree(domain); | |
67 | } | |
68 | ||
a8db8cf0 GL |
69 | static 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); | |
54a90588 | 74 | pr_debug("Allocated domain of type %d @0x%p\n", |
a8db8cf0 GL |
75 | domain->revmap_type, domain); |
76 | } | |
77 | ||
58ee99ad PM |
78 | /** |
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 | */ | |
86 | void 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 | ||
54a90588 | 124 | pr_debug("Removed domain of type %d @0x%p\n", |
58ee99ad PM |
125 | domain->revmap_type, domain); |
126 | ||
127 | irq_domain_free(domain); | |
128 | } | |
ecd84eb2 | 129 | EXPORT_SYMBOL_GPL(irq_domain_remove); |
58ee99ad | 130 | |
1bc04f2c GL |
131 | static 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 | ||
781d0f46 MB |
142 | /** |
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 | * @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 | |
151 | * domain otherwise. | |
152 | * | |
153 | * This is intended to implement the expected behaviour for most | |
154 | * interrupt controllers which is that a linear mapping should | |
155 | * normally be used unless the system requires a legacy mapping in | |
156 | * order to support supplying interrupt numbers during non-DT | |
157 | * registration of devices. | |
158 | */ | |
159 | struct irq_domain *irq_domain_add_simple(struct device_node *of_node, | |
160 | unsigned int size, | |
161 | unsigned int first_irq, | |
162 | const struct irq_domain_ops *ops, | |
163 | void *host_data) | |
164 | { | |
165 | if (first_irq > 0) | |
166 | return irq_domain_add_legacy(of_node, size, first_irq, 0, | |
167 | ops, host_data); | |
168 | else | |
169 | return irq_domain_add_linear(of_node, size, ops, host_data); | |
170 | } | |
171 | ||
a8db8cf0 GL |
172 | /** |
173 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
174 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
175 | * @size: total number of irqs in legacy mapping |
176 | * @first_irq: first number of irq block assigned to the domain | |
177 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
178 | * be '0', but a positive integer can be used if the effective | |
179 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
180 | * @ops: map/unmap domain callbacks |
181 | * @host_data: Controller private data pointer | |
182 | * | |
183 | * Note: the map() callback will be called before this function returns | |
184 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
185 | * a legacy controller). | |
186 | */ | |
187 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
188 | unsigned int size, |
189 | unsigned int first_irq, | |
190 | irq_hw_number_t first_hwirq, | |
a18dc81b | 191 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
192 | void *host_data) |
193 | { | |
1bc04f2c | 194 | struct irq_domain *domain; |
a8db8cf0 GL |
195 | unsigned int i; |
196 | ||
197 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data); | |
198 | if (!domain) | |
199 | return NULL; | |
200 | ||
1bc04f2c GL |
201 | domain->revmap_data.legacy.first_irq = first_irq; |
202 | domain->revmap_data.legacy.first_hwirq = first_hwirq; | |
203 | domain->revmap_data.legacy.size = size; | |
204 | ||
cc79ca69 | 205 | mutex_lock(&irq_domain_mutex); |
1bc04f2c GL |
206 | /* Verify that all the irqs are available */ |
207 | for (i = 0; i < size; i++) { | |
208 | int irq = first_irq + i; | |
209 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
210 | ||
211 | if (WARN_ON(!irq_data || irq_data->domain)) { | |
a8db8cf0 | 212 | mutex_unlock(&irq_domain_mutex); |
58ee99ad | 213 | irq_domain_free(domain); |
a8db8cf0 | 214 | return NULL; |
cc79ca69 GL |
215 | } |
216 | } | |
cc79ca69 | 217 | |
1bc04f2c GL |
218 | /* Claim all of the irqs before registering a legacy domain */ |
219 | for (i = 0; i < size; i++) { | |
220 | struct irq_data *irq_data = irq_get_irq_data(first_irq + i); | |
221 | irq_data->hwirq = first_hwirq + i; | |
a8db8cf0 | 222 | irq_data->domain = domain; |
1bc04f2c GL |
223 | } |
224 | mutex_unlock(&irq_domain_mutex); | |
225 | ||
226 | for (i = 0; i < size; i++) { | |
227 | int irq = first_irq + i; | |
228 | int hwirq = first_hwirq + i; | |
229 | ||
230 | /* IRQ0 gets ignored */ | |
231 | if (!irq) | |
232 | continue; | |
a8db8cf0 GL |
233 | |
234 | /* Legacy flags are left to default at this point, | |
235 | * one can then use irq_create_mapping() to | |
236 | * explicitly change them | |
237 | */ | |
aed98048 GL |
238 | if (ops->map) |
239 | ops->map(domain, irq, hwirq); | |
a8db8cf0 GL |
240 | |
241 | /* Clear norequest flags */ | |
1bc04f2c | 242 | irq_clear_status_flags(irq, IRQ_NOREQUEST); |
cc79ca69 | 243 | } |
1bc04f2c GL |
244 | |
245 | irq_domain_add(domain); | |
a8db8cf0 GL |
246 | return domain; |
247 | } | |
ecd84eb2 | 248 | EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
a8db8cf0 GL |
249 | |
250 | /** | |
22076c77 | 251 | * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain. |
a8db8cf0 | 252 | * @of_node: pointer to interrupt controller's device tree node. |
a87487e6 | 253 | * @size: Number of interrupts in the domain. |
a8db8cf0 GL |
254 | * @ops: map/unmap domain callbacks |
255 | * @host_data: Controller private data pointer | |
256 | */ | |
257 | struct irq_domain *irq_domain_add_linear(struct device_node *of_node, | |
258 | unsigned int size, | |
a18dc81b | 259 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
260 | void *host_data) |
261 | { | |
262 | struct irq_domain *domain; | |
263 | unsigned int *revmap; | |
cc79ca69 | 264 | |
5ca4db61 PM |
265 | revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL, |
266 | of_node_to_nid(of_node)); | |
a8db8cf0 GL |
267 | if (WARN_ON(!revmap)) |
268 | return NULL; | |
cc79ca69 | 269 | |
a8db8cf0 GL |
270 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data); |
271 | if (!domain) { | |
272 | kfree(revmap); | |
273 | return NULL; | |
274 | } | |
275 | domain->revmap_data.linear.size = size; | |
276 | domain->revmap_data.linear.revmap = revmap; | |
277 | irq_domain_add(domain); | |
278 | return domain; | |
279 | } | |
ecd84eb2 | 280 | EXPORT_SYMBOL_GPL(irq_domain_add_linear); |
a8db8cf0 GL |
281 | |
282 | struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, | |
6fa6c8e2 | 283 | unsigned int max_irq, |
a18dc81b | 284 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
285 | void *host_data) |
286 | { | |
287 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
288 | IRQ_DOMAIN_MAP_NOMAP, ops, host_data); | |
6fa6c8e2 GL |
289 | if (domain) { |
290 | domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0; | |
a8db8cf0 | 291 | irq_domain_add(domain); |
6fa6c8e2 | 292 | } |
a8db8cf0 GL |
293 | return domain; |
294 | } | |
ecd84eb2 | 295 | EXPORT_SYMBOL_GPL(irq_domain_add_nomap); |
a8db8cf0 GL |
296 | |
297 | /** | |
298 | * irq_domain_add_tree() | |
299 | * @of_node: pointer to interrupt controller's device tree node. | |
300 | * @ops: map/unmap domain callbacks | |
301 | * | |
302 | * Note: The radix tree will be allocated later during boot automatically | |
303 | * (the reverse mapping will use the slow path until that happens). | |
304 | */ | |
305 | struct irq_domain *irq_domain_add_tree(struct device_node *of_node, | |
a18dc81b | 306 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
307 | void *host_data) |
308 | { | |
309 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
310 | IRQ_DOMAIN_MAP_TREE, ops, host_data); | |
311 | if (domain) { | |
312 | INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL); | |
313 | irq_domain_add(domain); | |
314 | } | |
68700650 | 315 | return domain; |
cc79ca69 | 316 | } |
ecd84eb2 | 317 | EXPORT_SYMBOL_GPL(irq_domain_add_tree); |
cc79ca69 GL |
318 | |
319 | /** | |
320 | * irq_find_host() - Locates a domain for a given device node | |
321 | * @node: device-tree node of the interrupt controller | |
322 | */ | |
323 | struct irq_domain *irq_find_host(struct device_node *node) | |
324 | { | |
325 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 326 | int rc; |
cc79ca69 GL |
327 | |
328 | /* We might want to match the legacy controller last since | |
329 | * it might potentially be set to match all interrupts in | |
330 | * the absence of a device node. This isn't a problem so far | |
331 | * yet though... | |
332 | */ | |
333 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
334 | list_for_each_entry(h, &irq_domain_list, link) { |
335 | if (h->ops->match) | |
336 | rc = h->ops->match(h, node); | |
337 | else | |
338 | rc = (h->of_node != NULL) && (h->of_node == node); | |
339 | ||
340 | if (rc) { | |
cc79ca69 GL |
341 | found = h; |
342 | break; | |
343 | } | |
a18dc81b | 344 | } |
cc79ca69 GL |
345 | mutex_unlock(&irq_domain_mutex); |
346 | return found; | |
347 | } | |
348 | EXPORT_SYMBOL_GPL(irq_find_host); | |
349 | ||
350 | /** | |
351 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 352 | * @domain: default domain pointer |
cc79ca69 GL |
353 | * |
354 | * For convenience, it's possible to set a "default" domain that will be used | |
355 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
356 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
357 | * aren't properly represented in the device-tree. | |
358 | */ | |
68700650 | 359 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 360 | { |
54a90588 | 361 | pr_debug("Default domain set to @0x%p\n", domain); |
cc79ca69 | 362 | |
68700650 | 363 | irq_default_domain = domain; |
cc79ca69 | 364 | } |
ecd84eb2 | 365 | EXPORT_SYMBOL_GPL(irq_set_default_host); |
cc79ca69 | 366 | |
913af207 GL |
367 | static void irq_domain_disassociate_many(struct irq_domain *domain, |
368 | unsigned int irq_base, int count) | |
369 | { | |
370 | /* | |
371 | * disassociate in reverse order; | |
372 | * not strictly necessary, but nice for unwinding | |
373 | */ | |
374 | while (count--) { | |
375 | int irq = irq_base + count; | |
376 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
377 | irq_hw_number_t hwirq = irq_data->hwirq; | |
378 | ||
379 | if (WARN_ON(!irq_data || irq_data->domain != domain)) | |
380 | continue; | |
381 | ||
382 | irq_set_status_flags(irq, IRQ_NOREQUEST); | |
383 | ||
384 | /* remove chip and handler */ | |
385 | irq_set_chip_and_handler(irq, NULL, NULL); | |
386 | ||
387 | /* Make sure it's completed */ | |
388 | synchronize_irq(irq); | |
389 | ||
390 | /* Tell the PIC about it */ | |
391 | if (domain->ops->unmap) | |
392 | domain->ops->unmap(domain, irq); | |
393 | smp_mb(); | |
394 | ||
395 | irq_data->domain = NULL; | |
396 | irq_data->hwirq = 0; | |
397 | ||
398 | /* Clear reverse map */ | |
399 | switch(domain->revmap_type) { | |
400 | case IRQ_DOMAIN_MAP_LINEAR: | |
401 | if (hwirq < domain->revmap_data.linear.size) | |
402 | domain->revmap_data.linear.revmap[hwirq] = 0; | |
403 | break; | |
404 | case IRQ_DOMAIN_MAP_TREE: | |
405 | mutex_lock(&revmap_trees_mutex); | |
406 | radix_tree_delete(&domain->revmap_data.tree, hwirq); | |
407 | mutex_unlock(&revmap_trees_mutex); | |
408 | break; | |
409 | } | |
410 | } | |
411 | } | |
412 | ||
98aa468e GL |
413 | int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, |
414 | irq_hw_number_t hwirq_base, int count) | |
cc79ca69 | 415 | { |
98aa468e GL |
416 | unsigned int virq = irq_base; |
417 | irq_hw_number_t hwirq = hwirq_base; | |
f5a1ad05 | 418 | int i, ret; |
cc79ca69 | 419 | |
98aa468e GL |
420 | pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, |
421 | of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count); | |
cc79ca69 | 422 | |
98aa468e GL |
423 | for (i = 0; i < count; i++) { |
424 | struct irq_data *irq_data = irq_get_irq_data(virq + i); | |
425 | ||
426 | if (WARN(!irq_data, "error: irq_desc not allocated; " | |
427 | "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) | |
428 | return -EINVAL; | |
429 | if (WARN(irq_data->domain, "error: irq_desc already associated; " | |
430 | "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) | |
431 | return -EINVAL; | |
432 | }; | |
433 | ||
434 | for (i = 0; i < count; i++, virq++, hwirq++) { | |
435 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
436 | ||
437 | irq_data->hwirq = hwirq; | |
438 | irq_data->domain = domain; | |
f5a1ad05 MB |
439 | if (domain->ops->map) { |
440 | ret = domain->ops->map(domain, virq, hwirq); | |
441 | if (ret != 0) { | |
442 | pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n", | |
443 | virq, hwirq, ret); | |
444 | WARN_ON(1); | |
445 | irq_data->domain = NULL; | |
446 | irq_data->hwirq = 0; | |
447 | goto err_unmap; | |
448 | } | |
98aa468e GL |
449 | } |
450 | ||
451 | switch (domain->revmap_type) { | |
452 | case IRQ_DOMAIN_MAP_LINEAR: | |
453 | if (hwirq < domain->revmap_data.linear.size) | |
454 | domain->revmap_data.linear.revmap[hwirq] = virq; | |
455 | break; | |
456 | case IRQ_DOMAIN_MAP_TREE: | |
457 | mutex_lock(&revmap_trees_mutex); | |
d6b0d1f7 | 458 | radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data); |
98aa468e GL |
459 | mutex_unlock(&revmap_trees_mutex); |
460 | break; | |
461 | } | |
2a71a1a9 | 462 | |
98aa468e GL |
463 | irq_clear_status_flags(virq, IRQ_NOREQUEST); |
464 | } | |
cc79ca69 GL |
465 | |
466 | return 0; | |
98aa468e GL |
467 | |
468 | err_unmap: | |
469 | irq_domain_disassociate_many(domain, irq_base, i); | |
470 | return -EINVAL; | |
cc79ca69 | 471 | } |
98aa468e | 472 | EXPORT_SYMBOL_GPL(irq_domain_associate_many); |
cc79ca69 GL |
473 | |
474 | /** | |
475 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 476 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
477 | * |
478 | * This routine is used for irq controllers which can choose the hardware | |
479 | * interrupt numbers they generate. In such a case it's simplest to use | |
480 | * the linux irq as the hardware interrupt number. | |
481 | */ | |
68700650 | 482 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
483 | { |
484 | unsigned int virq; | |
485 | ||
68700650 GL |
486 | if (domain == NULL) |
487 | domain = irq_default_domain; | |
cc79ca69 | 488 | |
9844a552 GL |
489 | if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP)) |
490 | return 0; | |
cc79ca69 | 491 | |
5ca4db61 | 492 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
03848373 | 493 | if (!virq) { |
54a90588 | 494 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 495 | return 0; |
cc79ca69 | 496 | } |
6fa6c8e2 | 497 | if (virq >= domain->revmap_data.nomap.max_irq) { |
cc79ca69 | 498 | pr_err("ERROR: no free irqs available below %i maximum\n", |
6fa6c8e2 | 499 | domain->revmap_data.nomap.max_irq); |
cc79ca69 GL |
500 | irq_free_desc(virq); |
501 | return 0; | |
502 | } | |
54a90588 | 503 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 504 | |
98aa468e | 505 | if (irq_domain_associate(domain, virq, virq)) { |
cc79ca69 | 506 | irq_free_desc(virq); |
03848373 | 507 | return 0; |
cc79ca69 GL |
508 | } |
509 | ||
510 | return virq; | |
511 | } | |
ecd84eb2 | 512 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
513 | |
514 | /** | |
515 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
516 | * @domain: domain owning this hardware interrupt or NULL for default domain |
517 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
518 | * |
519 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
520 | * irq number. | |
521 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
522 | * on the number returned from that call. | |
523 | */ | |
68700650 | 524 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
525 | irq_hw_number_t hwirq) |
526 | { | |
5b7526e3 DD |
527 | unsigned int hint; |
528 | int virq; | |
cc79ca69 | 529 | |
54a90588 | 530 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 531 | |
68700650 GL |
532 | /* Look for default domain if nececssary */ |
533 | if (domain == NULL) | |
534 | domain = irq_default_domain; | |
535 | if (domain == NULL) { | |
54a90588 PM |
536 | pr_warning("irq_create_mapping called for" |
537 | " NULL domain, hwirq=%lx\n", hwirq); | |
cc79ca69 | 538 | WARN_ON(1); |
03848373 | 539 | return 0; |
cc79ca69 | 540 | } |
54a90588 | 541 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
542 | |
543 | /* Check if mapping already exists */ | |
68700650 | 544 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 545 | if (virq) { |
54a90588 | 546 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
547 | return virq; |
548 | } | |
549 | ||
550 | /* Get a virtual interrupt number */ | |
1bc04f2c GL |
551 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
552 | return irq_domain_legacy_revmap(domain, hwirq); | |
553 | ||
554 | /* Allocate a virtual interrupt number */ | |
6fa6c8e2 | 555 | hint = hwirq % nr_irqs; |
1bc04f2c GL |
556 | if (hint == 0) |
557 | hint++; | |
5ca4db61 | 558 | virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node)); |
5b7526e3 | 559 | if (virq <= 0) |
5ca4db61 | 560 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
5b7526e3 | 561 | if (virq <= 0) { |
54a90588 | 562 | pr_debug("-> virq allocation failed\n"); |
1bc04f2c | 563 | return 0; |
cc79ca69 GL |
564 | } |
565 | ||
98aa468e | 566 | if (irq_domain_associate(domain, virq, hwirq)) { |
73255704 | 567 | irq_free_desc(virq); |
03848373 | 568 | return 0; |
cc79ca69 GL |
569 | } |
570 | ||
54a90588 | 571 | pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", |
efd68e72 | 572 | hwirq, of_node_full_name(domain->of_node), virq); |
cc79ca69 GL |
573 | |
574 | return virq; | |
575 | } | |
576 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
577 | ||
98aa468e GL |
578 | /** |
579 | * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs | |
580 | * @domain: domain owning the interrupt range | |
581 | * @irq_base: beginning of linux IRQ range | |
582 | * @hwirq_base: beginning of hardware IRQ range | |
583 | * @count: Number of interrupts to map | |
584 | * | |
585 | * This routine is used for allocating and mapping a range of hardware | |
586 | * irqs to linux irqs where the linux irq numbers are at pre-defined | |
587 | * locations. For use by controllers that already have static mappings | |
588 | * to insert in to the domain. | |
589 | * | |
590 | * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time | |
591 | * domain insertion. | |
592 | * | |
593 | * 0 is returned upon success, while any failure to establish a static | |
594 | * mapping is treated as an error. | |
595 | */ | |
596 | int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, | |
597 | irq_hw_number_t hwirq_base, int count) | |
598 | { | |
599 | int ret; | |
600 | ||
601 | ret = irq_alloc_descs(irq_base, irq_base, count, | |
602 | of_node_to_nid(domain->of_node)); | |
603 | if (unlikely(ret < 0)) | |
604 | return ret; | |
605 | ||
606 | ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count); | |
607 | if (unlikely(ret < 0)) { | |
608 | irq_free_descs(irq_base, count); | |
609 | return ret; | |
610 | } | |
611 | ||
612 | return 0; | |
613 | } | |
614 | EXPORT_SYMBOL_GPL(irq_create_strict_mappings); | |
615 | ||
cc79ca69 GL |
616 | unsigned int irq_create_of_mapping(struct device_node *controller, |
617 | const u32 *intspec, unsigned int intsize) | |
618 | { | |
68700650 | 619 | struct irq_domain *domain; |
cc79ca69 GL |
620 | irq_hw_number_t hwirq; |
621 | unsigned int type = IRQ_TYPE_NONE; | |
622 | unsigned int virq; | |
623 | ||
68700650 GL |
624 | domain = controller ? irq_find_host(controller) : irq_default_domain; |
625 | if (!domain) { | |
abd2363f GL |
626 | #ifdef CONFIG_MIPS |
627 | /* | |
628 | * Workaround to avoid breaking interrupt controller drivers | |
629 | * that don't yet register an irq_domain. This is temporary | |
630 | * code. ~~~gcl, Feb 24, 2012 | |
631 | * | |
632 | * Scheduled for removal in Linux v3.6. That should be enough | |
633 | * time. | |
634 | */ | |
635 | if (intsize > 0) | |
636 | return intspec[0]; | |
637 | #endif | |
54a90588 | 638 | pr_warning("no irq domain found for %s !\n", |
efd68e72 | 639 | of_node_full_name(controller)); |
03848373 | 640 | return 0; |
cc79ca69 GL |
641 | } |
642 | ||
68700650 GL |
643 | /* If domain has no translation, then we assume interrupt line */ |
644 | if (domain->ops->xlate == NULL) | |
cc79ca69 GL |
645 | hwirq = intspec[0]; |
646 | else { | |
68700650 | 647 | if (domain->ops->xlate(domain, controller, intspec, intsize, |
cc79ca69 | 648 | &hwirq, &type)) |
03848373 | 649 | return 0; |
cc79ca69 GL |
650 | } |
651 | ||
652 | /* Create mapping */ | |
68700650 | 653 | virq = irq_create_mapping(domain, hwirq); |
03848373 | 654 | if (!virq) |
cc79ca69 GL |
655 | return virq; |
656 | ||
657 | /* Set type if specified and different than the current one */ | |
658 | if (type != IRQ_TYPE_NONE && | |
659 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) | |
660 | irq_set_irq_type(virq, type); | |
661 | return virq; | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
664 | ||
665 | /** | |
666 | * irq_dispose_mapping() - Unmap an interrupt | |
667 | * @virq: linux irq number of the interrupt to unmap | |
668 | */ | |
669 | void irq_dispose_mapping(unsigned int virq) | |
670 | { | |
671 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 672 | struct irq_domain *domain; |
cc79ca69 | 673 | |
03848373 | 674 | if (!virq || !irq_data) |
cc79ca69 GL |
675 | return; |
676 | ||
68700650 GL |
677 | domain = irq_data->domain; |
678 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
679 | return; |
680 | ||
681 | /* Never unmap legacy interrupts */ | |
68700650 | 682 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
cc79ca69 GL |
683 | return; |
684 | ||
913af207 | 685 | irq_domain_disassociate_many(domain, virq, 1); |
cc79ca69 GL |
686 | irq_free_desc(virq); |
687 | } | |
688 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
689 | ||
690 | /** | |
691 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
692 | * @domain: domain owning this hardware interrupt |
693 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 694 | */ |
68700650 | 695 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
696 | irq_hw_number_t hwirq) |
697 | { | |
4c0946c4 | 698 | struct irq_data *data; |
cc79ca69 | 699 | |
68700650 GL |
700 | /* Look for default domain if nececssary */ |
701 | if (domain == NULL) | |
702 | domain = irq_default_domain; | |
703 | if (domain == NULL) | |
03848373 | 704 | return 0; |
cc79ca69 | 705 | |
4c0946c4 GL |
706 | switch (domain->revmap_type) { |
707 | case IRQ_DOMAIN_MAP_LEGACY: | |
1bc04f2c | 708 | return irq_domain_legacy_revmap(domain, hwirq); |
4c0946c4 GL |
709 | case IRQ_DOMAIN_MAP_LINEAR: |
710 | return irq_linear_revmap(domain, hwirq); | |
711 | case IRQ_DOMAIN_MAP_TREE: | |
712 | rcu_read_lock(); | |
713 | data = radix_tree_lookup(&domain->revmap_data.tree, hwirq); | |
714 | rcu_read_unlock(); | |
715 | if (data) | |
716 | return data->irq; | |
717 | break; | |
718 | case IRQ_DOMAIN_MAP_NOMAP: | |
719 | data = irq_get_irq_data(hwirq); | |
68700650 | 720 | if (data && (data->domain == domain) && (data->hwirq == hwirq)) |
4c0946c4 GL |
721 | return hwirq; |
722 | break; | |
723 | } | |
724 | ||
03848373 | 725 | return 0; |
cc79ca69 GL |
726 | } |
727 | EXPORT_SYMBOL_GPL(irq_find_mapping); | |
728 | ||
cc79ca69 GL |
729 | /** |
730 | * irq_linear_revmap() - Find a linux irq from a hw irq number. | |
68700650 GL |
731 | * @domain: domain owning this hardware interrupt |
732 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 733 | * |
4c0946c4 GL |
734 | * This is a fast path that can be called directly by irq controller code to |
735 | * save a handful of instructions. | |
cc79ca69 | 736 | */ |
68700650 | 737 | unsigned int irq_linear_revmap(struct irq_domain *domain, |
cc79ca69 GL |
738 | irq_hw_number_t hwirq) |
739 | { | |
4c0946c4 | 740 | BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR); |
cc79ca69 | 741 | |
4c0946c4 GL |
742 | /* Check revmap bounds; complain if exceeded */ |
743 | if (WARN_ON(hwirq >= domain->revmap_data.linear.size)) | |
744 | return 0; | |
cc79ca69 | 745 | |
4c0946c4 | 746 | return domain->revmap_data.linear.revmap[hwirq]; |
cc79ca69 | 747 | } |
ecd84eb2 | 748 | EXPORT_SYMBOL_GPL(irq_linear_revmap); |
cc79ca69 | 749 | |
092b2fb0 | 750 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
751 | static int virq_debug_show(struct seq_file *m, void *private) |
752 | { | |
753 | unsigned long flags; | |
754 | struct irq_desc *desc; | |
755 | const char *p; | |
756 | static const char none[] = "none"; | |
757 | void *data; | |
758 | int i; | |
759 | ||
15e06bf6 | 760 | seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq", |
5269a9ab GL |
761 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
762 | "domain name"); | |
cc79ca69 GL |
763 | |
764 | for (i = 1; i < nr_irqs; i++) { | |
765 | desc = irq_to_desc(i); | |
766 | if (!desc) | |
767 | continue; | |
768 | ||
769 | raw_spin_lock_irqsave(&desc->lock, flags); | |
770 | ||
771 | if (desc->action && desc->action->handler) { | |
772 | struct irq_chip *chip; | |
773 | ||
774 | seq_printf(m, "%5d ", i); | |
775 | seq_printf(m, "0x%05lx ", desc->irq_data.hwirq); | |
776 | ||
777 | chip = irq_desc_get_chip(desc); | |
778 | if (chip && chip->name) | |
779 | p = chip->name; | |
780 | else | |
781 | p = none; | |
782 | seq_printf(m, "%-15s ", p); | |
783 | ||
784 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 785 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 786 | |
efd68e72 GL |
787 | if (desc->irq_data.domain) |
788 | p = of_node_full_name(desc->irq_data.domain->of_node); | |
cc79ca69 GL |
789 | else |
790 | p = none; | |
791 | seq_printf(m, "%s\n", p); | |
792 | } | |
793 | ||
794 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
795 | } | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | static int virq_debug_open(struct inode *inode, struct file *file) | |
801 | { | |
802 | return single_open(file, virq_debug_show, inode->i_private); | |
803 | } | |
804 | ||
805 | static const struct file_operations virq_debug_fops = { | |
806 | .open = virq_debug_open, | |
807 | .read = seq_read, | |
808 | .llseek = seq_lseek, | |
809 | .release = single_release, | |
810 | }; | |
811 | ||
812 | static int __init irq_debugfs_init(void) | |
813 | { | |
092b2fb0 | 814 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
815 | NULL, &virq_debug_fops) == NULL) |
816 | return -ENOMEM; | |
817 | ||
818 | return 0; | |
819 | } | |
820 | __initcall(irq_debugfs_init); | |
092b2fb0 | 821 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 822 | |
16b2e6e2 GL |
823 | /** |
824 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
825 | * | |
826 | * Device Tree IRQ specifier translation function which works with one cell | |
827 | * bindings where the cell value maps directly to the hwirq number. | |
828 | */ | |
829 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
830 | const u32 *intspec, unsigned int intsize, | |
831 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 832 | { |
16b2e6e2 | 833 | if (WARN_ON(intsize < 1)) |
7e713301 | 834 | return -EINVAL; |
7e713301 GL |
835 | *out_hwirq = intspec[0]; |
836 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
837 | return 0; |
838 | } | |
16b2e6e2 GL |
839 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
840 | ||
841 | /** | |
842 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
843 | * | |
844 | * Device Tree IRQ specifier translation function which works with two cell | |
845 | * bindings where the cell values map directly to the hwirq number | |
846 | * and linux irq flags. | |
847 | */ | |
848 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
849 | const u32 *intspec, unsigned int intsize, | |
850 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
851 | { | |
852 | if (WARN_ON(intsize < 2)) | |
853 | return -EINVAL; | |
854 | *out_hwirq = intspec[0]; | |
855 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
856 | return 0; | |
857 | } | |
858 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
859 | ||
860 | /** | |
861 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
862 | * | |
863 | * Device Tree IRQ specifier translation function which works with either one | |
864 | * or two cell bindings where the cell values map directly to the hwirq number | |
865 | * and linux irq flags. | |
866 | * | |
867 | * Note: don't use this function unless your interrupt controller explicitly | |
868 | * supports both one and two cell bindings. For the majority of controllers | |
869 | * the _onecell() or _twocell() variants above should be used. | |
870 | */ | |
871 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
872 | struct device_node *ctrlr, | |
873 | const u32 *intspec, unsigned int intsize, | |
874 | unsigned long *out_hwirq, unsigned int *out_type) | |
875 | { | |
876 | if (WARN_ON(intsize < 1)) | |
877 | return -EINVAL; | |
878 | *out_hwirq = intspec[0]; | |
879 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
880 | return 0; | |
881 | } | |
882 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 883 | |
a18dc81b | 884 | const struct irq_domain_ops irq_domain_simple_ops = { |
16b2e6e2 | 885 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
886 | }; |
887 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
888 | ||
889 | #ifdef CONFIG_OF_IRQ | |
7e713301 GL |
890 | void irq_domain_generate_simple(const struct of_device_id *match, |
891 | u64 phys_base, unsigned int irq_start) | |
892 | { | |
893 | struct device_node *node; | |
e1964c50 | 894 | pr_debug("looking for phys_base=%llx, irq_start=%i\n", |
7e713301 GL |
895 | (unsigned long long) phys_base, (int) irq_start); |
896 | node = of_find_matching_node_by_address(NULL, match, phys_base); | |
897 | if (node) | |
6b783f7c GL |
898 | irq_domain_add_legacy(node, 32, irq_start, 0, |
899 | &irq_domain_simple_ops, NULL); | |
7e713301 GL |
900 | } |
901 | EXPORT_SYMBOL_GPL(irq_domain_generate_simple); | |
75294957 | 902 | #endif |