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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 | |
68700650 | 367 | static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, |
cc79ca69 GL |
368 | irq_hw_number_t hwirq) |
369 | { | |
370 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
371 | ||
372 | irq_data->hwirq = hwirq; | |
68700650 | 373 | irq_data->domain = domain; |
aed98048 GL |
374 | if (domain->ops->map && domain->ops->map(domain, virq, hwirq)) { |
375 | pr_err("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq); | |
cc79ca69 GL |
376 | irq_data->domain = NULL; |
377 | irq_data->hwirq = 0; | |
378 | return -1; | |
379 | } | |
380 | ||
381 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
382 | ||
383 | return 0; | |
384 | } | |
385 | ||
386 | /** | |
387 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 388 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
389 | * |
390 | * This routine is used for irq controllers which can choose the hardware | |
391 | * interrupt numbers they generate. In such a case it's simplest to use | |
392 | * the linux irq as the hardware interrupt number. | |
393 | */ | |
68700650 | 394 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
395 | { |
396 | unsigned int virq; | |
397 | ||
68700650 GL |
398 | if (domain == NULL) |
399 | domain = irq_default_domain; | |
cc79ca69 | 400 | |
68700650 GL |
401 | BUG_ON(domain == NULL); |
402 | WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP); | |
cc79ca69 | 403 | |
5ca4db61 | 404 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
03848373 | 405 | if (!virq) { |
54a90588 | 406 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 407 | return 0; |
cc79ca69 | 408 | } |
6fa6c8e2 | 409 | if (virq >= domain->revmap_data.nomap.max_irq) { |
cc79ca69 | 410 | pr_err("ERROR: no free irqs available below %i maximum\n", |
6fa6c8e2 | 411 | domain->revmap_data.nomap.max_irq); |
cc79ca69 GL |
412 | irq_free_desc(virq); |
413 | return 0; | |
414 | } | |
54a90588 | 415 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 416 | |
68700650 | 417 | if (irq_setup_virq(domain, virq, virq)) { |
cc79ca69 | 418 | irq_free_desc(virq); |
03848373 | 419 | return 0; |
cc79ca69 GL |
420 | } |
421 | ||
422 | return virq; | |
423 | } | |
ecd84eb2 | 424 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
425 | |
426 | /** | |
427 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
428 | * @domain: domain owning this hardware interrupt or NULL for default domain |
429 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
430 | * |
431 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
432 | * irq number. | |
433 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
434 | * on the number returned from that call. | |
435 | */ | |
68700650 | 436 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
437 | irq_hw_number_t hwirq) |
438 | { | |
5b7526e3 DD |
439 | unsigned int hint; |
440 | int virq; | |
cc79ca69 | 441 | |
54a90588 | 442 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 443 | |
68700650 GL |
444 | /* Look for default domain if nececssary */ |
445 | if (domain == NULL) | |
446 | domain = irq_default_domain; | |
447 | if (domain == NULL) { | |
54a90588 PM |
448 | pr_warning("irq_create_mapping called for" |
449 | " NULL domain, hwirq=%lx\n", hwirq); | |
cc79ca69 | 450 | WARN_ON(1); |
03848373 | 451 | return 0; |
cc79ca69 | 452 | } |
54a90588 | 453 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
454 | |
455 | /* Check if mapping already exists */ | |
68700650 | 456 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 457 | if (virq) { |
54a90588 | 458 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
459 | return virq; |
460 | } | |
461 | ||
462 | /* Get a virtual interrupt number */ | |
1bc04f2c GL |
463 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
464 | return irq_domain_legacy_revmap(domain, hwirq); | |
465 | ||
466 | /* Allocate a virtual interrupt number */ | |
6fa6c8e2 | 467 | hint = hwirq % nr_irqs; |
1bc04f2c GL |
468 | if (hint == 0) |
469 | hint++; | |
5ca4db61 | 470 | virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node)); |
5b7526e3 | 471 | if (virq <= 0) |
5ca4db61 | 472 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
5b7526e3 | 473 | if (virq <= 0) { |
54a90588 | 474 | pr_debug("-> virq allocation failed\n"); |
1bc04f2c | 475 | return 0; |
cc79ca69 GL |
476 | } |
477 | ||
68700650 | 478 | if (irq_setup_virq(domain, virq, hwirq)) { |
73255704 | 479 | irq_free_desc(virq); |
03848373 | 480 | return 0; |
cc79ca69 GL |
481 | } |
482 | ||
54a90588 | 483 | pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", |
efd68e72 | 484 | hwirq, of_node_full_name(domain->of_node), virq); |
cc79ca69 GL |
485 | |
486 | return virq; | |
487 | } | |
488 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
489 | ||
490 | unsigned int irq_create_of_mapping(struct device_node *controller, | |
491 | const u32 *intspec, unsigned int intsize) | |
492 | { | |
68700650 | 493 | struct irq_domain *domain; |
cc79ca69 GL |
494 | irq_hw_number_t hwirq; |
495 | unsigned int type = IRQ_TYPE_NONE; | |
496 | unsigned int virq; | |
497 | ||
68700650 GL |
498 | domain = controller ? irq_find_host(controller) : irq_default_domain; |
499 | if (!domain) { | |
abd2363f GL |
500 | #ifdef CONFIG_MIPS |
501 | /* | |
502 | * Workaround to avoid breaking interrupt controller drivers | |
503 | * that don't yet register an irq_domain. This is temporary | |
504 | * code. ~~~gcl, Feb 24, 2012 | |
505 | * | |
506 | * Scheduled for removal in Linux v3.6. That should be enough | |
507 | * time. | |
508 | */ | |
509 | if (intsize > 0) | |
510 | return intspec[0]; | |
511 | #endif | |
54a90588 | 512 | pr_warning("no irq domain found for %s !\n", |
efd68e72 | 513 | of_node_full_name(controller)); |
03848373 | 514 | return 0; |
cc79ca69 GL |
515 | } |
516 | ||
68700650 GL |
517 | /* If domain has no translation, then we assume interrupt line */ |
518 | if (domain->ops->xlate == NULL) | |
cc79ca69 GL |
519 | hwirq = intspec[0]; |
520 | else { | |
68700650 | 521 | if (domain->ops->xlate(domain, controller, intspec, intsize, |
cc79ca69 | 522 | &hwirq, &type)) |
03848373 | 523 | return 0; |
cc79ca69 GL |
524 | } |
525 | ||
526 | /* Create mapping */ | |
68700650 | 527 | virq = irq_create_mapping(domain, hwirq); |
03848373 | 528 | if (!virq) |
cc79ca69 GL |
529 | return virq; |
530 | ||
531 | /* Set type if specified and different than the current one */ | |
532 | if (type != IRQ_TYPE_NONE && | |
533 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) | |
534 | irq_set_irq_type(virq, type); | |
535 | return virq; | |
536 | } | |
537 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
538 | ||
539 | /** | |
540 | * irq_dispose_mapping() - Unmap an interrupt | |
541 | * @virq: linux irq number of the interrupt to unmap | |
542 | */ | |
543 | void irq_dispose_mapping(unsigned int virq) | |
544 | { | |
545 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 546 | struct irq_domain *domain; |
cc79ca69 GL |
547 | irq_hw_number_t hwirq; |
548 | ||
03848373 | 549 | if (!virq || !irq_data) |
cc79ca69 GL |
550 | return; |
551 | ||
68700650 GL |
552 | domain = irq_data->domain; |
553 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
554 | return; |
555 | ||
556 | /* Never unmap legacy interrupts */ | |
68700650 | 557 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
cc79ca69 GL |
558 | return; |
559 | ||
560 | irq_set_status_flags(virq, IRQ_NOREQUEST); | |
561 | ||
562 | /* remove chip and handler */ | |
563 | irq_set_chip_and_handler(virq, NULL, NULL); | |
564 | ||
565 | /* Make sure it's completed */ | |
566 | synchronize_irq(virq); | |
567 | ||
568 | /* Tell the PIC about it */ | |
68700650 GL |
569 | if (domain->ops->unmap) |
570 | domain->ops->unmap(domain, virq); | |
cc79ca69 GL |
571 | smp_mb(); |
572 | ||
573 | /* Clear reverse map */ | |
574 | hwirq = irq_data->hwirq; | |
68700650 | 575 | switch(domain->revmap_type) { |
cc79ca69 | 576 | case IRQ_DOMAIN_MAP_LINEAR: |
68700650 GL |
577 | if (hwirq < domain->revmap_data.linear.size) |
578 | domain->revmap_data.linear.revmap[hwirq] = 0; | |
cc79ca69 GL |
579 | break; |
580 | case IRQ_DOMAIN_MAP_TREE: | |
581 | mutex_lock(&revmap_trees_mutex); | |
68700650 | 582 | radix_tree_delete(&domain->revmap_data.tree, hwirq); |
cc79ca69 GL |
583 | mutex_unlock(&revmap_trees_mutex); |
584 | break; | |
585 | } | |
586 | ||
cc79ca69 GL |
587 | irq_free_desc(virq); |
588 | } | |
589 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
590 | ||
591 | /** | |
592 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
593 | * @domain: domain owning this hardware interrupt |
594 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
595 | * |
596 | * This is a slow path, for use by generic code. It's expected that an | |
597 | * irq controller implementation directly calls the appropriate low level | |
598 | * mapping function. | |
599 | */ | |
68700650 | 600 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
601 | irq_hw_number_t hwirq) |
602 | { | |
603 | unsigned int i; | |
6fa6c8e2 | 604 | unsigned int hint = hwirq % nr_irqs; |
cc79ca69 | 605 | |
68700650 GL |
606 | /* Look for default domain if nececssary */ |
607 | if (domain == NULL) | |
608 | domain = irq_default_domain; | |
609 | if (domain == NULL) | |
03848373 | 610 | return 0; |
cc79ca69 GL |
611 | |
612 | /* legacy -> bail early */ | |
68700650 | 613 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
1bc04f2c | 614 | return irq_domain_legacy_revmap(domain, hwirq); |
cc79ca69 GL |
615 | |
616 | /* Slow path does a linear search of the map */ | |
617 | if (hint == 0) | |
618 | hint = 1; | |
619 | i = hint; | |
620 | do { | |
621 | struct irq_data *data = irq_get_irq_data(i); | |
68700650 | 622 | if (data && (data->domain == domain) && (data->hwirq == hwirq)) |
cc79ca69 GL |
623 | return i; |
624 | i++; | |
6fa6c8e2 | 625 | if (i >= nr_irqs) |
cc79ca69 GL |
626 | i = 1; |
627 | } while(i != hint); | |
03848373 | 628 | return 0; |
cc79ca69 GL |
629 | } |
630 | EXPORT_SYMBOL_GPL(irq_find_mapping); | |
631 | ||
632 | /** | |
633 | * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number. | |
68700650 GL |
634 | * @domain: domain owning this hardware interrupt |
635 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
636 | * |
637 | * This is a fast path, for use by irq controller code that uses radix tree | |
638 | * revmaps | |
639 | */ | |
68700650 | 640 | unsigned int irq_radix_revmap_lookup(struct irq_domain *domain, |
cc79ca69 GL |
641 | irq_hw_number_t hwirq) |
642 | { | |
643 | struct irq_data *irq_data; | |
644 | ||
68700650 GL |
645 | if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE)) |
646 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
647 | |
648 | /* | |
649 | * Freeing an irq can delete nodes along the path to | |
650 | * do the lookup via call_rcu. | |
651 | */ | |
652 | rcu_read_lock(); | |
68700650 | 653 | irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq); |
cc79ca69 GL |
654 | rcu_read_unlock(); |
655 | ||
656 | /* | |
657 | * If found in radix tree, then fine. | |
658 | * Else fallback to linear lookup - this should not happen in practice | |
659 | * as it means that we failed to insert the node in the radix tree. | |
660 | */ | |
68700650 | 661 | return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq); |
cc79ca69 | 662 | } |
ecd84eb2 | 663 | EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup); |
cc79ca69 GL |
664 | |
665 | /** | |
666 | * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping. | |
68700650 | 667 | * @domain: domain owning this hardware interrupt |
cc79ca69 | 668 | * @virq: linux irq number |
68700650 | 669 | * @hwirq: hardware irq number in that domain space |
cc79ca69 GL |
670 | * |
671 | * This is for use by irq controllers that use a radix tree reverse | |
672 | * mapping for fast lookup. | |
673 | */ | |
68700650 | 674 | void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq, |
cc79ca69 GL |
675 | irq_hw_number_t hwirq) |
676 | { | |
677 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
678 | ||
68700650 | 679 | if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE)) |
cc79ca69 GL |
680 | return; |
681 | ||
03848373 | 682 | if (virq) { |
cc79ca69 | 683 | mutex_lock(&revmap_trees_mutex); |
68700650 | 684 | radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data); |
cc79ca69 GL |
685 | mutex_unlock(&revmap_trees_mutex); |
686 | } | |
687 | } | |
ecd84eb2 | 688 | EXPORT_SYMBOL_GPL(irq_radix_revmap_insert); |
cc79ca69 GL |
689 | |
690 | /** | |
691 | * irq_linear_revmap() - Find a linux irq from a hw irq number. | |
68700650 GL |
692 | * @domain: domain owning this hardware interrupt |
693 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
694 | * |
695 | * This is a fast path, for use by irq controller code that uses linear | |
696 | * revmaps. It does fallback to the slow path if the revmap doesn't exist | |
697 | * yet and will create the revmap entry with appropriate locking | |
698 | */ | |
68700650 | 699 | unsigned int irq_linear_revmap(struct irq_domain *domain, |
cc79ca69 GL |
700 | irq_hw_number_t hwirq) |
701 | { | |
702 | unsigned int *revmap; | |
703 | ||
68700650 GL |
704 | if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR)) |
705 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
706 | |
707 | /* Check revmap bounds */ | |
68700650 GL |
708 | if (unlikely(hwirq >= domain->revmap_data.linear.size)) |
709 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
710 | |
711 | /* Check if revmap was allocated */ | |
68700650 | 712 | revmap = domain->revmap_data.linear.revmap; |
cc79ca69 | 713 | if (unlikely(revmap == NULL)) |
68700650 | 714 | return irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
715 | |
716 | /* Fill up revmap with slow path if no mapping found */ | |
03848373 | 717 | if (unlikely(!revmap[hwirq])) |
68700650 | 718 | revmap[hwirq] = irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
719 | |
720 | return revmap[hwirq]; | |
721 | } | |
ecd84eb2 | 722 | EXPORT_SYMBOL_GPL(irq_linear_revmap); |
cc79ca69 | 723 | |
092b2fb0 | 724 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
725 | static int virq_debug_show(struct seq_file *m, void *private) |
726 | { | |
727 | unsigned long flags; | |
728 | struct irq_desc *desc; | |
729 | const char *p; | |
730 | static const char none[] = "none"; | |
731 | void *data; | |
732 | int i; | |
733 | ||
15e06bf6 | 734 | seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq", |
5269a9ab GL |
735 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
736 | "domain name"); | |
cc79ca69 GL |
737 | |
738 | for (i = 1; i < nr_irqs; i++) { | |
739 | desc = irq_to_desc(i); | |
740 | if (!desc) | |
741 | continue; | |
742 | ||
743 | raw_spin_lock_irqsave(&desc->lock, flags); | |
744 | ||
745 | if (desc->action && desc->action->handler) { | |
746 | struct irq_chip *chip; | |
747 | ||
748 | seq_printf(m, "%5d ", i); | |
749 | seq_printf(m, "0x%05lx ", desc->irq_data.hwirq); | |
750 | ||
751 | chip = irq_desc_get_chip(desc); | |
752 | if (chip && chip->name) | |
753 | p = chip->name; | |
754 | else | |
755 | p = none; | |
756 | seq_printf(m, "%-15s ", p); | |
757 | ||
758 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 759 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 760 | |
efd68e72 GL |
761 | if (desc->irq_data.domain) |
762 | p = of_node_full_name(desc->irq_data.domain->of_node); | |
cc79ca69 GL |
763 | else |
764 | p = none; | |
765 | seq_printf(m, "%s\n", p); | |
766 | } | |
767 | ||
768 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
769 | } | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
774 | static int virq_debug_open(struct inode *inode, struct file *file) | |
775 | { | |
776 | return single_open(file, virq_debug_show, inode->i_private); | |
777 | } | |
778 | ||
779 | static const struct file_operations virq_debug_fops = { | |
780 | .open = virq_debug_open, | |
781 | .read = seq_read, | |
782 | .llseek = seq_lseek, | |
783 | .release = single_release, | |
784 | }; | |
785 | ||
786 | static int __init irq_debugfs_init(void) | |
787 | { | |
092b2fb0 | 788 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
789 | NULL, &virq_debug_fops) == NULL) |
790 | return -ENOMEM; | |
791 | ||
792 | return 0; | |
793 | } | |
794 | __initcall(irq_debugfs_init); | |
092b2fb0 | 795 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 796 | |
16b2e6e2 GL |
797 | /** |
798 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
799 | * | |
800 | * Device Tree IRQ specifier translation function which works with one cell | |
801 | * bindings where the cell value maps directly to the hwirq number. | |
802 | */ | |
803 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
804 | const u32 *intspec, unsigned int intsize, | |
805 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 806 | { |
16b2e6e2 | 807 | if (WARN_ON(intsize < 1)) |
7e713301 | 808 | return -EINVAL; |
7e713301 GL |
809 | *out_hwirq = intspec[0]; |
810 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
811 | return 0; |
812 | } | |
16b2e6e2 GL |
813 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
814 | ||
815 | /** | |
816 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
817 | * | |
818 | * Device Tree IRQ specifier translation function which works with two cell | |
819 | * bindings where the cell values map directly to the hwirq number | |
820 | * and linux irq flags. | |
821 | */ | |
822 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
823 | const u32 *intspec, unsigned int intsize, | |
824 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
825 | { | |
826 | if (WARN_ON(intsize < 2)) | |
827 | return -EINVAL; | |
828 | *out_hwirq = intspec[0]; | |
829 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
830 | return 0; | |
831 | } | |
832 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
833 | ||
834 | /** | |
835 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
836 | * | |
837 | * Device Tree IRQ specifier translation function which works with either one | |
838 | * or two cell bindings where the cell values map directly to the hwirq number | |
839 | * and linux irq flags. | |
840 | * | |
841 | * Note: don't use this function unless your interrupt controller explicitly | |
842 | * supports both one and two cell bindings. For the majority of controllers | |
843 | * the _onecell() or _twocell() variants above should be used. | |
844 | */ | |
845 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
846 | struct device_node *ctrlr, | |
847 | const u32 *intspec, unsigned int intsize, | |
848 | unsigned long *out_hwirq, unsigned int *out_type) | |
849 | { | |
850 | if (WARN_ON(intsize < 1)) | |
851 | return -EINVAL; | |
852 | *out_hwirq = intspec[0]; | |
853 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
854 | return 0; | |
855 | } | |
856 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 857 | |
a18dc81b | 858 | const struct irq_domain_ops irq_domain_simple_ops = { |
16b2e6e2 | 859 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
860 | }; |
861 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
862 | ||
863 | #ifdef CONFIG_OF_IRQ | |
7e713301 GL |
864 | void irq_domain_generate_simple(const struct of_device_id *match, |
865 | u64 phys_base, unsigned int irq_start) | |
866 | { | |
867 | struct device_node *node; | |
e1964c50 | 868 | pr_debug("looking for phys_base=%llx, irq_start=%i\n", |
7e713301 GL |
869 | (unsigned long long) phys_base, (int) irq_start); |
870 | node = of_find_matching_node_by_address(NULL, match, phys_base); | |
871 | if (node) | |
6b783f7c GL |
872 | irq_domain_add_legacy(node, 32, irq_start, 0, |
873 | &irq_domain_simple_ops, NULL); | |
7e713301 GL |
874 | } |
875 | EXPORT_SYMBOL_GPL(irq_domain_generate_simple); | |
75294957 | 876 | #endif |