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cc79ca69 GL |
1 | #include <linux/debugfs.h> |
2 | #include <linux/hardirq.h> | |
3 | #include <linux/interrupt.h> | |
08a543ad | 4 | #include <linux/irq.h> |
cc79ca69 | 5 | #include <linux/irqdesc.h> |
08a543ad GL |
6 | #include <linux/irqdomain.h> |
7 | #include <linux/module.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/of.h> | |
7e713301 | 10 | #include <linux/of_address.h> |
cc79ca69 | 11 | #include <linux/seq_file.h> |
7e713301 | 12 | #include <linux/slab.h> |
cc79ca69 GL |
13 | #include <linux/smp.h> |
14 | #include <linux/fs.h> | |
08a543ad | 15 | |
1bc04f2c GL |
16 | #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs. |
17 | * ie. legacy 8259, gets irqs 1..15 */ | |
a8db8cf0 GL |
18 | #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */ |
19 | #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */ | |
20 | #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */ | |
21 | ||
08a543ad GL |
22 | static LIST_HEAD(irq_domain_list); |
23 | static DEFINE_MUTEX(irq_domain_mutex); | |
24 | ||
cc79ca69 GL |
25 | static DEFINE_MUTEX(revmap_trees_mutex); |
26 | static unsigned int irq_virq_count = NR_IRQS; | |
68700650 | 27 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 28 | |
cc79ca69 | 29 | /** |
a8db8cf0 | 30 | * irq_domain_alloc() - Allocate a new irq_domain data structure |
cc79ca69 GL |
31 | * @of_node: optional device-tree node of the interrupt controller |
32 | * @revmap_type: type of reverse mapping to use | |
68700650 | 33 | * @ops: map/unmap domain callbacks |
a8db8cf0 | 34 | * @host_data: Controller private data pointer |
cc79ca69 | 35 | * |
a8db8cf0 GL |
36 | * Allocates and initialize and irq_domain structure. Caller is expected to |
37 | * register allocated irq_domain with irq_domain_register(). Returns pointer | |
38 | * to IRQ domain, or NULL on failure. | |
cc79ca69 | 39 | */ |
a8db8cf0 GL |
40 | static struct irq_domain *irq_domain_alloc(struct device_node *of_node, |
41 | unsigned int revmap_type, | |
a18dc81b | 42 | const struct irq_domain_ops *ops, |
a8db8cf0 | 43 | void *host_data) |
cc79ca69 | 44 | { |
a8db8cf0 | 45 | struct irq_domain *domain; |
cc79ca69 | 46 | |
a8db8cf0 GL |
47 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
48 | if (WARN_ON(!domain)) | |
cc79ca69 GL |
49 | return NULL; |
50 | ||
51 | /* Fill structure */ | |
68700650 | 52 | domain->revmap_type = revmap_type; |
68700650 | 53 | domain->ops = ops; |
a8db8cf0 | 54 | domain->host_data = host_data; |
68700650 | 55 | domain->of_node = of_node_get(of_node); |
cc79ca69 | 56 | |
a8db8cf0 GL |
57 | return domain; |
58 | } | |
59 | ||
60 | static void irq_domain_add(struct irq_domain *domain) | |
61 | { | |
62 | mutex_lock(&irq_domain_mutex); | |
63 | list_add(&domain->link, &irq_domain_list); | |
64 | mutex_unlock(&irq_domain_mutex); | |
65 | pr_debug("irq: Allocated domain of type %d @0x%p\n", | |
66 | domain->revmap_type, domain); | |
67 | } | |
68 | ||
1bc04f2c GL |
69 | static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain, |
70 | irq_hw_number_t hwirq) | |
71 | { | |
72 | irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq; | |
73 | int size = domain->revmap_data.legacy.size; | |
74 | ||
75 | if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size)) | |
76 | return 0; | |
77 | return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq; | |
78 | } | |
79 | ||
a8db8cf0 GL |
80 | /** |
81 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
82 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
83 | * @size: total number of irqs in legacy mapping |
84 | * @first_irq: first number of irq block assigned to the domain | |
85 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
86 | * be '0', but a positive integer can be used if the effective | |
87 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
88 | * @ops: map/unmap domain callbacks |
89 | * @host_data: Controller private data pointer | |
90 | * | |
91 | * Note: the map() callback will be called before this function returns | |
92 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
93 | * a legacy controller). | |
94 | */ | |
95 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
96 | unsigned int size, |
97 | unsigned int first_irq, | |
98 | irq_hw_number_t first_hwirq, | |
a18dc81b | 99 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
100 | void *host_data) |
101 | { | |
1bc04f2c | 102 | struct irq_domain *domain; |
a8db8cf0 GL |
103 | unsigned int i; |
104 | ||
105 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data); | |
106 | if (!domain) | |
107 | return NULL; | |
108 | ||
1bc04f2c GL |
109 | domain->revmap_data.legacy.first_irq = first_irq; |
110 | domain->revmap_data.legacy.first_hwirq = first_hwirq; | |
111 | domain->revmap_data.legacy.size = size; | |
112 | ||
cc79ca69 | 113 | mutex_lock(&irq_domain_mutex); |
1bc04f2c GL |
114 | /* Verify that all the irqs are available */ |
115 | for (i = 0; i < size; i++) { | |
116 | int irq = first_irq + i; | |
117 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
118 | ||
119 | if (WARN_ON(!irq_data || irq_data->domain)) { | |
a8db8cf0 GL |
120 | mutex_unlock(&irq_domain_mutex); |
121 | of_node_put(domain->of_node); | |
122 | kfree(domain); | |
123 | return NULL; | |
cc79ca69 GL |
124 | } |
125 | } | |
cc79ca69 | 126 | |
1bc04f2c GL |
127 | /* Claim all of the irqs before registering a legacy domain */ |
128 | for (i = 0; i < size; i++) { | |
129 | struct irq_data *irq_data = irq_get_irq_data(first_irq + i); | |
130 | irq_data->hwirq = first_hwirq + i; | |
a8db8cf0 | 131 | irq_data->domain = domain; |
1bc04f2c GL |
132 | } |
133 | mutex_unlock(&irq_domain_mutex); | |
134 | ||
135 | for (i = 0; i < size; i++) { | |
136 | int irq = first_irq + i; | |
137 | int hwirq = first_hwirq + i; | |
138 | ||
139 | /* IRQ0 gets ignored */ | |
140 | if (!irq) | |
141 | continue; | |
a8db8cf0 GL |
142 | |
143 | /* Legacy flags are left to default at this point, | |
144 | * one can then use irq_create_mapping() to | |
145 | * explicitly change them | |
146 | */ | |
1bc04f2c | 147 | ops->map(domain, irq, hwirq); |
a8db8cf0 GL |
148 | |
149 | /* Clear norequest flags */ | |
1bc04f2c | 150 | irq_clear_status_flags(irq, IRQ_NOREQUEST); |
cc79ca69 | 151 | } |
1bc04f2c GL |
152 | |
153 | irq_domain_add(domain); | |
a8db8cf0 GL |
154 | return domain; |
155 | } | |
156 | ||
157 | /** | |
158 | * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain. | |
159 | * @of_node: pointer to interrupt controller's device tree node. | |
160 | * @ops: map/unmap domain callbacks | |
161 | * @host_data: Controller private data pointer | |
162 | */ | |
163 | struct irq_domain *irq_domain_add_linear(struct device_node *of_node, | |
164 | unsigned int size, | |
a18dc81b | 165 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
166 | void *host_data) |
167 | { | |
168 | struct irq_domain *domain; | |
169 | unsigned int *revmap; | |
cc79ca69 | 170 | |
a8db8cf0 GL |
171 | revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL); |
172 | if (WARN_ON(!revmap)) | |
173 | return NULL; | |
cc79ca69 | 174 | |
a8db8cf0 GL |
175 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data); |
176 | if (!domain) { | |
177 | kfree(revmap); | |
178 | return NULL; | |
179 | } | |
180 | domain->revmap_data.linear.size = size; | |
181 | domain->revmap_data.linear.revmap = revmap; | |
182 | irq_domain_add(domain); | |
183 | return domain; | |
184 | } | |
185 | ||
186 | struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, | |
a18dc81b | 187 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
188 | void *host_data) |
189 | { | |
190 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
191 | IRQ_DOMAIN_MAP_NOMAP, ops, host_data); | |
192 | if (domain) | |
193 | irq_domain_add(domain); | |
194 | return domain; | |
195 | } | |
196 | ||
197 | /** | |
198 | * irq_domain_add_tree() | |
199 | * @of_node: pointer to interrupt controller's device tree node. | |
200 | * @ops: map/unmap domain callbacks | |
201 | * | |
202 | * Note: The radix tree will be allocated later during boot automatically | |
203 | * (the reverse mapping will use the slow path until that happens). | |
204 | */ | |
205 | struct irq_domain *irq_domain_add_tree(struct device_node *of_node, | |
a18dc81b | 206 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
207 | void *host_data) |
208 | { | |
209 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
210 | IRQ_DOMAIN_MAP_TREE, ops, host_data); | |
211 | if (domain) { | |
212 | INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL); | |
213 | irq_domain_add(domain); | |
214 | } | |
68700650 | 215 | return domain; |
cc79ca69 GL |
216 | } |
217 | ||
218 | /** | |
219 | * irq_find_host() - Locates a domain for a given device node | |
220 | * @node: device-tree node of the interrupt controller | |
221 | */ | |
222 | struct irq_domain *irq_find_host(struct device_node *node) | |
223 | { | |
224 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 225 | int rc; |
cc79ca69 GL |
226 | |
227 | /* We might want to match the legacy controller last since | |
228 | * it might potentially be set to match all interrupts in | |
229 | * the absence of a device node. This isn't a problem so far | |
230 | * yet though... | |
231 | */ | |
232 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
233 | list_for_each_entry(h, &irq_domain_list, link) { |
234 | if (h->ops->match) | |
235 | rc = h->ops->match(h, node); | |
236 | else | |
237 | rc = (h->of_node != NULL) && (h->of_node == node); | |
238 | ||
239 | if (rc) { | |
cc79ca69 GL |
240 | found = h; |
241 | break; | |
242 | } | |
a18dc81b | 243 | } |
cc79ca69 GL |
244 | mutex_unlock(&irq_domain_mutex); |
245 | return found; | |
246 | } | |
247 | EXPORT_SYMBOL_GPL(irq_find_host); | |
248 | ||
249 | /** | |
250 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 251 | * @domain: default domain pointer |
cc79ca69 GL |
252 | * |
253 | * For convenience, it's possible to set a "default" domain that will be used | |
254 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
255 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
256 | * aren't properly represented in the device-tree. | |
257 | */ | |
68700650 | 258 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 259 | { |
68700650 | 260 | pr_debug("irq: Default domain set to @0x%p\n", domain); |
cc79ca69 | 261 | |
68700650 | 262 | irq_default_domain = domain; |
cc79ca69 GL |
263 | } |
264 | ||
265 | /** | |
266 | * irq_set_virq_count() - Set the maximum number of linux irqs | |
267 | * @count: number of linux irqs, capped with NR_IRQS | |
268 | * | |
269 | * This is mainly for use by platforms like iSeries who want to program | |
270 | * the virtual irq number in the controller to avoid the reverse mapping | |
271 | */ | |
272 | void irq_set_virq_count(unsigned int count) | |
273 | { | |
274 | pr_debug("irq: Trying to set virq count to %d\n", count); | |
275 | ||
276 | BUG_ON(count < NUM_ISA_INTERRUPTS); | |
277 | if (count < NR_IRQS) | |
278 | irq_virq_count = count; | |
279 | } | |
280 | ||
68700650 | 281 | static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, |
cc79ca69 GL |
282 | irq_hw_number_t hwirq) |
283 | { | |
284 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
285 | ||
286 | irq_data->hwirq = hwirq; | |
68700650 GL |
287 | irq_data->domain = domain; |
288 | if (domain->ops->map(domain, virq, hwirq)) { | |
cc79ca69 GL |
289 | pr_debug("irq: -> mapping failed, freeing\n"); |
290 | irq_data->domain = NULL; | |
291 | irq_data->hwirq = 0; | |
292 | return -1; | |
293 | } | |
294 | ||
295 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | /** | |
301 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 302 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
303 | * |
304 | * This routine is used for irq controllers which can choose the hardware | |
305 | * interrupt numbers they generate. In such a case it's simplest to use | |
306 | * the linux irq as the hardware interrupt number. | |
307 | */ | |
68700650 | 308 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
309 | { |
310 | unsigned int virq; | |
311 | ||
68700650 GL |
312 | if (domain == NULL) |
313 | domain = irq_default_domain; | |
cc79ca69 | 314 | |
68700650 GL |
315 | BUG_ON(domain == NULL); |
316 | WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP); | |
cc79ca69 GL |
317 | |
318 | virq = irq_alloc_desc_from(1, 0); | |
03848373 | 319 | if (!virq) { |
cc79ca69 | 320 | pr_debug("irq: create_direct virq allocation failed\n"); |
03848373 | 321 | return 0; |
cc79ca69 GL |
322 | } |
323 | if (virq >= irq_virq_count) { | |
324 | pr_err("ERROR: no free irqs available below %i maximum\n", | |
325 | irq_virq_count); | |
326 | irq_free_desc(virq); | |
327 | return 0; | |
328 | } | |
329 | ||
330 | pr_debug("irq: create_direct obtained virq %d\n", virq); | |
331 | ||
68700650 | 332 | if (irq_setup_virq(domain, virq, virq)) { |
cc79ca69 | 333 | irq_free_desc(virq); |
03848373 | 334 | return 0; |
cc79ca69 GL |
335 | } |
336 | ||
337 | return virq; | |
338 | } | |
339 | ||
340 | /** | |
341 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
342 | * @domain: domain owning this hardware interrupt or NULL for default domain |
343 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
344 | * |
345 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
346 | * irq number. | |
347 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
348 | * on the number returned from that call. | |
349 | */ | |
68700650 | 350 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
351 | irq_hw_number_t hwirq) |
352 | { | |
353 | unsigned int virq, hint; | |
354 | ||
68700650 | 355 | pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 356 | |
68700650 GL |
357 | /* Look for default domain if nececssary */ |
358 | if (domain == NULL) | |
359 | domain = irq_default_domain; | |
360 | if (domain == NULL) { | |
cc79ca69 | 361 | printk(KERN_WARNING "irq_create_mapping called for" |
68700650 | 362 | " NULL domain, hwirq=%lx\n", hwirq); |
cc79ca69 | 363 | WARN_ON(1); |
03848373 | 364 | return 0; |
cc79ca69 | 365 | } |
68700650 | 366 | pr_debug("irq: -> using domain @%p\n", domain); |
cc79ca69 GL |
367 | |
368 | /* Check if mapping already exists */ | |
68700650 | 369 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 370 | if (virq) { |
cc79ca69 GL |
371 | pr_debug("irq: -> existing mapping on virq %d\n", virq); |
372 | return virq; | |
373 | } | |
374 | ||
375 | /* Get a virtual interrupt number */ | |
1bc04f2c GL |
376 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
377 | return irq_domain_legacy_revmap(domain, hwirq); | |
378 | ||
379 | /* Allocate a virtual interrupt number */ | |
380 | hint = hwirq % irq_virq_count; | |
381 | if (hint == 0) | |
382 | hint++; | |
383 | virq = irq_alloc_desc_from(hint, 0); | |
384 | if (!virq) | |
385 | virq = irq_alloc_desc_from(1, 0); | |
386 | if (!virq) { | |
387 | pr_debug("irq: -> virq allocation failed\n"); | |
388 | return 0; | |
cc79ca69 GL |
389 | } |
390 | ||
68700650 GL |
391 | if (irq_setup_virq(domain, virq, hwirq)) { |
392 | if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY) | |
cc79ca69 | 393 | irq_free_desc(virq); |
03848373 | 394 | return 0; |
cc79ca69 GL |
395 | } |
396 | ||
68700650 GL |
397 | pr_debug("irq: irq %lu on domain %s mapped to virtual irq %u\n", |
398 | hwirq, domain->of_node ? domain->of_node->full_name : "null", virq); | |
cc79ca69 GL |
399 | |
400 | return virq; | |
401 | } | |
402 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
403 | ||
404 | unsigned int irq_create_of_mapping(struct device_node *controller, | |
405 | const u32 *intspec, unsigned int intsize) | |
406 | { | |
68700650 | 407 | struct irq_domain *domain; |
cc79ca69 GL |
408 | irq_hw_number_t hwirq; |
409 | unsigned int type = IRQ_TYPE_NONE; | |
410 | unsigned int virq; | |
411 | ||
68700650 GL |
412 | domain = controller ? irq_find_host(controller) : irq_default_domain; |
413 | if (!domain) { | |
abd2363f GL |
414 | #ifdef CONFIG_MIPS |
415 | /* | |
416 | * Workaround to avoid breaking interrupt controller drivers | |
417 | * that don't yet register an irq_domain. This is temporary | |
418 | * code. ~~~gcl, Feb 24, 2012 | |
419 | * | |
420 | * Scheduled for removal in Linux v3.6. That should be enough | |
421 | * time. | |
422 | */ | |
423 | if (intsize > 0) | |
424 | return intspec[0]; | |
425 | #endif | |
68700650 | 426 | printk(KERN_WARNING "irq: no irq domain found for %s !\n", |
cc79ca69 | 427 | controller->full_name); |
03848373 | 428 | return 0; |
cc79ca69 GL |
429 | } |
430 | ||
68700650 GL |
431 | /* If domain has no translation, then we assume interrupt line */ |
432 | if (domain->ops->xlate == NULL) | |
cc79ca69 GL |
433 | hwirq = intspec[0]; |
434 | else { | |
68700650 | 435 | if (domain->ops->xlate(domain, controller, intspec, intsize, |
cc79ca69 | 436 | &hwirq, &type)) |
03848373 | 437 | return 0; |
cc79ca69 GL |
438 | } |
439 | ||
440 | /* Create mapping */ | |
68700650 | 441 | virq = irq_create_mapping(domain, hwirq); |
03848373 | 442 | if (!virq) |
cc79ca69 GL |
443 | return virq; |
444 | ||
445 | /* Set type if specified and different than the current one */ | |
446 | if (type != IRQ_TYPE_NONE && | |
447 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) | |
448 | irq_set_irq_type(virq, type); | |
449 | return virq; | |
450 | } | |
451 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
452 | ||
453 | /** | |
454 | * irq_dispose_mapping() - Unmap an interrupt | |
455 | * @virq: linux irq number of the interrupt to unmap | |
456 | */ | |
457 | void irq_dispose_mapping(unsigned int virq) | |
458 | { | |
459 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 460 | struct irq_domain *domain; |
cc79ca69 GL |
461 | irq_hw_number_t hwirq; |
462 | ||
03848373 | 463 | if (!virq || !irq_data) |
cc79ca69 GL |
464 | return; |
465 | ||
68700650 GL |
466 | domain = irq_data->domain; |
467 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
468 | return; |
469 | ||
470 | /* Never unmap legacy interrupts */ | |
68700650 | 471 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
cc79ca69 GL |
472 | return; |
473 | ||
474 | irq_set_status_flags(virq, IRQ_NOREQUEST); | |
475 | ||
476 | /* remove chip and handler */ | |
477 | irq_set_chip_and_handler(virq, NULL, NULL); | |
478 | ||
479 | /* Make sure it's completed */ | |
480 | synchronize_irq(virq); | |
481 | ||
482 | /* Tell the PIC about it */ | |
68700650 GL |
483 | if (domain->ops->unmap) |
484 | domain->ops->unmap(domain, virq); | |
cc79ca69 GL |
485 | smp_mb(); |
486 | ||
487 | /* Clear reverse map */ | |
488 | hwirq = irq_data->hwirq; | |
68700650 | 489 | switch(domain->revmap_type) { |
cc79ca69 | 490 | case IRQ_DOMAIN_MAP_LINEAR: |
68700650 GL |
491 | if (hwirq < domain->revmap_data.linear.size) |
492 | domain->revmap_data.linear.revmap[hwirq] = 0; | |
cc79ca69 GL |
493 | break; |
494 | case IRQ_DOMAIN_MAP_TREE: | |
495 | mutex_lock(&revmap_trees_mutex); | |
68700650 | 496 | radix_tree_delete(&domain->revmap_data.tree, hwirq); |
cc79ca69 GL |
497 | mutex_unlock(&revmap_trees_mutex); |
498 | break; | |
499 | } | |
500 | ||
cc79ca69 GL |
501 | irq_free_desc(virq); |
502 | } | |
503 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
504 | ||
505 | /** | |
506 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
507 | * @domain: domain owning this hardware interrupt |
508 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
509 | * |
510 | * This is a slow path, for use by generic code. It's expected that an | |
511 | * irq controller implementation directly calls the appropriate low level | |
512 | * mapping function. | |
513 | */ | |
68700650 | 514 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
515 | irq_hw_number_t hwirq) |
516 | { | |
517 | unsigned int i; | |
518 | unsigned int hint = hwirq % irq_virq_count; | |
519 | ||
68700650 GL |
520 | /* Look for default domain if nececssary */ |
521 | if (domain == NULL) | |
522 | domain = irq_default_domain; | |
523 | if (domain == NULL) | |
03848373 | 524 | return 0; |
cc79ca69 GL |
525 | |
526 | /* legacy -> bail early */ | |
68700650 | 527 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
1bc04f2c | 528 | return irq_domain_legacy_revmap(domain, hwirq); |
cc79ca69 GL |
529 | |
530 | /* Slow path does a linear search of the map */ | |
531 | if (hint == 0) | |
532 | hint = 1; | |
533 | i = hint; | |
534 | do { | |
535 | struct irq_data *data = irq_get_irq_data(i); | |
68700650 | 536 | if (data && (data->domain == domain) && (data->hwirq == hwirq)) |
cc79ca69 GL |
537 | return i; |
538 | i++; | |
539 | if (i >= irq_virq_count) | |
540 | i = 1; | |
541 | } while(i != hint); | |
03848373 | 542 | return 0; |
cc79ca69 GL |
543 | } |
544 | EXPORT_SYMBOL_GPL(irq_find_mapping); | |
545 | ||
546 | /** | |
547 | * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number. | |
68700650 GL |
548 | * @domain: domain owning this hardware interrupt |
549 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
550 | * |
551 | * This is a fast path, for use by irq controller code that uses radix tree | |
552 | * revmaps | |
553 | */ | |
68700650 | 554 | unsigned int irq_radix_revmap_lookup(struct irq_domain *domain, |
cc79ca69 GL |
555 | irq_hw_number_t hwirq) |
556 | { | |
557 | struct irq_data *irq_data; | |
558 | ||
68700650 GL |
559 | if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE)) |
560 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
561 | |
562 | /* | |
563 | * Freeing an irq can delete nodes along the path to | |
564 | * do the lookup via call_rcu. | |
565 | */ | |
566 | rcu_read_lock(); | |
68700650 | 567 | irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq); |
cc79ca69 GL |
568 | rcu_read_unlock(); |
569 | ||
570 | /* | |
571 | * If found in radix tree, then fine. | |
572 | * Else fallback to linear lookup - this should not happen in practice | |
573 | * as it means that we failed to insert the node in the radix tree. | |
574 | */ | |
68700650 | 575 | return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
576 | } |
577 | ||
578 | /** | |
579 | * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping. | |
68700650 | 580 | * @domain: domain owning this hardware interrupt |
cc79ca69 | 581 | * @virq: linux irq number |
68700650 | 582 | * @hwirq: hardware irq number in that domain space |
cc79ca69 GL |
583 | * |
584 | * This is for use by irq controllers that use a radix tree reverse | |
585 | * mapping for fast lookup. | |
586 | */ | |
68700650 | 587 | void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq, |
cc79ca69 GL |
588 | irq_hw_number_t hwirq) |
589 | { | |
590 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
591 | ||
68700650 | 592 | if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE)) |
cc79ca69 GL |
593 | return; |
594 | ||
03848373 | 595 | if (virq) { |
cc79ca69 | 596 | mutex_lock(&revmap_trees_mutex); |
68700650 | 597 | radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data); |
cc79ca69 GL |
598 | mutex_unlock(&revmap_trees_mutex); |
599 | } | |
600 | } | |
601 | ||
602 | /** | |
603 | * irq_linear_revmap() - Find a linux irq from a hw irq number. | |
68700650 GL |
604 | * @domain: domain owning this hardware interrupt |
605 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
606 | * |
607 | * This is a fast path, for use by irq controller code that uses linear | |
608 | * revmaps. It does fallback to the slow path if the revmap doesn't exist | |
609 | * yet and will create the revmap entry with appropriate locking | |
610 | */ | |
68700650 | 611 | unsigned int irq_linear_revmap(struct irq_domain *domain, |
cc79ca69 GL |
612 | irq_hw_number_t hwirq) |
613 | { | |
614 | unsigned int *revmap; | |
615 | ||
68700650 GL |
616 | if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR)) |
617 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
618 | |
619 | /* Check revmap bounds */ | |
68700650 GL |
620 | if (unlikely(hwirq >= domain->revmap_data.linear.size)) |
621 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
622 | |
623 | /* Check if revmap was allocated */ | |
68700650 | 624 | revmap = domain->revmap_data.linear.revmap; |
cc79ca69 | 625 | if (unlikely(revmap == NULL)) |
68700650 | 626 | return irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
627 | |
628 | /* Fill up revmap with slow path if no mapping found */ | |
03848373 | 629 | if (unlikely(!revmap[hwirq])) |
68700650 | 630 | revmap[hwirq] = irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
631 | |
632 | return revmap[hwirq]; | |
633 | } | |
634 | ||
635 | #ifdef CONFIG_VIRQ_DEBUG | |
636 | static int virq_debug_show(struct seq_file *m, void *private) | |
637 | { | |
638 | unsigned long flags; | |
639 | struct irq_desc *desc; | |
640 | const char *p; | |
641 | static const char none[] = "none"; | |
642 | void *data; | |
643 | int i; | |
644 | ||
645 | seq_printf(m, "%-5s %-7s %-15s %-18s %s\n", "virq", "hwirq", | |
68700650 | 646 | "chip name", "chip data", "domain name"); |
cc79ca69 GL |
647 | |
648 | for (i = 1; i < nr_irqs; i++) { | |
649 | desc = irq_to_desc(i); | |
650 | if (!desc) | |
651 | continue; | |
652 | ||
653 | raw_spin_lock_irqsave(&desc->lock, flags); | |
654 | ||
655 | if (desc->action && desc->action->handler) { | |
656 | struct irq_chip *chip; | |
657 | ||
658 | seq_printf(m, "%5d ", i); | |
659 | seq_printf(m, "0x%05lx ", desc->irq_data.hwirq); | |
660 | ||
661 | chip = irq_desc_get_chip(desc); | |
662 | if (chip && chip->name) | |
663 | p = chip->name; | |
664 | else | |
665 | p = none; | |
666 | seq_printf(m, "%-15s ", p); | |
667 | ||
668 | data = irq_desc_get_chip_data(desc); | |
669 | seq_printf(m, "0x%16p ", data); | |
670 | ||
671 | if (desc->irq_data.domain->of_node) | |
672 | p = desc->irq_data.domain->of_node->full_name; | |
673 | else | |
674 | p = none; | |
675 | seq_printf(m, "%s\n", p); | |
676 | } | |
677 | ||
678 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | static int virq_debug_open(struct inode *inode, struct file *file) | |
685 | { | |
686 | return single_open(file, virq_debug_show, inode->i_private); | |
687 | } | |
688 | ||
689 | static const struct file_operations virq_debug_fops = { | |
690 | .open = virq_debug_open, | |
691 | .read = seq_read, | |
692 | .llseek = seq_lseek, | |
693 | .release = single_release, | |
694 | }; | |
695 | ||
696 | static int __init irq_debugfs_init(void) | |
697 | { | |
698 | if (debugfs_create_file("virq_mapping", S_IRUGO, powerpc_debugfs_root, | |
699 | NULL, &virq_debug_fops) == NULL) | |
700 | return -ENOMEM; | |
701 | ||
702 | return 0; | |
703 | } | |
704 | __initcall(irq_debugfs_init); | |
705 | #endif /* CONFIG_VIRQ_DEBUG */ | |
706 | ||
75294957 GL |
707 | int irq_domain_simple_map(struct irq_domain *d, unsigned int irq, |
708 | irq_hw_number_t hwirq) | |
08a543ad | 709 | { |
75294957 | 710 | return 0; |
08a543ad | 711 | } |
7e713301 | 712 | |
16b2e6e2 GL |
713 | /** |
714 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
715 | * | |
716 | * Device Tree IRQ specifier translation function which works with one cell | |
717 | * bindings where the cell value maps directly to the hwirq number. | |
718 | */ | |
719 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
720 | const u32 *intspec, unsigned int intsize, | |
721 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 722 | { |
16b2e6e2 | 723 | if (WARN_ON(intsize < 1)) |
7e713301 | 724 | return -EINVAL; |
7e713301 GL |
725 | *out_hwirq = intspec[0]; |
726 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
727 | return 0; |
728 | } | |
16b2e6e2 GL |
729 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
730 | ||
731 | /** | |
732 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
733 | * | |
734 | * Device Tree IRQ specifier translation function which works with two cell | |
735 | * bindings where the cell values map directly to the hwirq number | |
736 | * and linux irq flags. | |
737 | */ | |
738 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
739 | const u32 *intspec, unsigned int intsize, | |
740 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
741 | { | |
742 | if (WARN_ON(intsize < 2)) | |
743 | return -EINVAL; | |
744 | *out_hwirq = intspec[0]; | |
745 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
746 | return 0; | |
747 | } | |
748 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
749 | ||
750 | /** | |
751 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
752 | * | |
753 | * Device Tree IRQ specifier translation function which works with either one | |
754 | * or two cell bindings where the cell values map directly to the hwirq number | |
755 | * and linux irq flags. | |
756 | * | |
757 | * Note: don't use this function unless your interrupt controller explicitly | |
758 | * supports both one and two cell bindings. For the majority of controllers | |
759 | * the _onecell() or _twocell() variants above should be used. | |
760 | */ | |
761 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
762 | struct device_node *ctrlr, | |
763 | const u32 *intspec, unsigned int intsize, | |
764 | unsigned long *out_hwirq, unsigned int *out_type) | |
765 | { | |
766 | if (WARN_ON(intsize < 1)) | |
767 | return -EINVAL; | |
768 | *out_hwirq = intspec[0]; | |
769 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
770 | return 0; | |
771 | } | |
772 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 773 | |
a18dc81b | 774 | const struct irq_domain_ops irq_domain_simple_ops = { |
75294957 | 775 | .map = irq_domain_simple_map, |
16b2e6e2 | 776 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
777 | }; |
778 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
779 | ||
780 | #ifdef CONFIG_OF_IRQ | |
7e713301 GL |
781 | void irq_domain_generate_simple(const struct of_device_id *match, |
782 | u64 phys_base, unsigned int irq_start) | |
783 | { | |
784 | struct device_node *node; | |
e1964c50 | 785 | pr_debug("looking for phys_base=%llx, irq_start=%i\n", |
7e713301 GL |
786 | (unsigned long long) phys_base, (int) irq_start); |
787 | node = of_find_matching_node_by_address(NULL, match, phys_base); | |
788 | if (node) | |
6b783f7c GL |
789 | irq_domain_add_legacy(node, 32, irq_start, 0, |
790 | &irq_domain_simple_ops, NULL); | |
7e713301 GL |
791 | } |
792 | EXPORT_SYMBOL_GPL(irq_domain_generate_simple); | |
75294957 | 793 | #endif |