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> |
cc79ca69 | 13 | #include <linux/seq_file.h> |
7e713301 | 14 | #include <linux/slab.h> |
cc79ca69 GL |
15 | #include <linux/smp.h> |
16 | #include <linux/fs.h> | |
08a543ad | 17 | |
1bc04f2c GL |
18 | #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs. |
19 | * ie. legacy 8259, gets irqs 1..15 */ | |
a8db8cf0 GL |
20 | #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */ |
21 | #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */ | |
22 | #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */ | |
23 | ||
08a543ad GL |
24 | static LIST_HEAD(irq_domain_list); |
25 | static DEFINE_MUTEX(irq_domain_mutex); | |
26 | ||
cc79ca69 | 27 | static DEFINE_MUTEX(revmap_trees_mutex); |
68700650 | 28 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 29 | |
cc79ca69 | 30 | /** |
a8db8cf0 | 31 | * irq_domain_alloc() - Allocate a new irq_domain data structure |
cc79ca69 GL |
32 | * @of_node: optional device-tree node of the interrupt controller |
33 | * @revmap_type: type of reverse mapping to use | |
68700650 | 34 | * @ops: map/unmap domain callbacks |
a8db8cf0 | 35 | * @host_data: Controller private data pointer |
cc79ca69 | 36 | * |
a8db8cf0 GL |
37 | * Allocates and initialize and irq_domain structure. Caller is expected to |
38 | * register allocated irq_domain with irq_domain_register(). Returns pointer | |
39 | * to IRQ domain, or NULL on failure. | |
cc79ca69 | 40 | */ |
a8db8cf0 GL |
41 | static struct irq_domain *irq_domain_alloc(struct device_node *of_node, |
42 | unsigned int revmap_type, | |
a18dc81b | 43 | const struct irq_domain_ops *ops, |
a8db8cf0 | 44 | void *host_data) |
cc79ca69 | 45 | { |
a8db8cf0 | 46 | struct irq_domain *domain; |
cc79ca69 | 47 | |
a8db8cf0 GL |
48 | domain = kzalloc(sizeof(*domain), GFP_KERNEL); |
49 | if (WARN_ON(!domain)) | |
cc79ca69 GL |
50 | return NULL; |
51 | ||
52 | /* Fill structure */ | |
68700650 | 53 | domain->revmap_type = revmap_type; |
68700650 | 54 | domain->ops = ops; |
a8db8cf0 | 55 | domain->host_data = host_data; |
68700650 | 56 | domain->of_node = of_node_get(of_node); |
cc79ca69 | 57 | |
a8db8cf0 GL |
58 | return domain; |
59 | } | |
60 | ||
58ee99ad PM |
61 | static void irq_domain_free(struct irq_domain *domain) |
62 | { | |
63 | of_node_put(domain->of_node); | |
64 | kfree(domain); | |
65 | } | |
66 | ||
a8db8cf0 GL |
67 | static void irq_domain_add(struct irq_domain *domain) |
68 | { | |
69 | mutex_lock(&irq_domain_mutex); | |
70 | list_add(&domain->link, &irq_domain_list); | |
71 | mutex_unlock(&irq_domain_mutex); | |
54a90588 | 72 | pr_debug("Allocated domain of type %d @0x%p\n", |
a8db8cf0 GL |
73 | domain->revmap_type, domain); |
74 | } | |
75 | ||
58ee99ad PM |
76 | /** |
77 | * irq_domain_remove() - Remove an irq domain. | |
78 | * @domain: domain to remove | |
79 | * | |
80 | * This routine is used to remove an irq domain. The caller must ensure | |
81 | * that all mappings within the domain have been disposed of prior to | |
82 | * use, depending on the revmap type. | |
83 | */ | |
84 | void irq_domain_remove(struct irq_domain *domain) | |
85 | { | |
86 | mutex_lock(&irq_domain_mutex); | |
87 | ||
88 | switch (domain->revmap_type) { | |
89 | case IRQ_DOMAIN_MAP_LEGACY: | |
90 | /* | |
91 | * Legacy domains don't manage their own irq_desc | |
92 | * allocations, we expect the caller to handle irq_desc | |
93 | * freeing on their own. | |
94 | */ | |
95 | break; | |
96 | case IRQ_DOMAIN_MAP_TREE: | |
97 | /* | |
98 | * radix_tree_delete() takes care of destroying the root | |
99 | * node when all entries are removed. Shout if there are | |
100 | * any mappings left. | |
101 | */ | |
102 | WARN_ON(domain->revmap_data.tree.height); | |
103 | break; | |
104 | case IRQ_DOMAIN_MAP_LINEAR: | |
105 | kfree(domain->revmap_data.linear.revmap); | |
106 | domain->revmap_data.linear.size = 0; | |
107 | break; | |
108 | case IRQ_DOMAIN_MAP_NOMAP: | |
109 | break; | |
110 | } | |
111 | ||
112 | list_del(&domain->link); | |
113 | ||
114 | /* | |
115 | * If the going away domain is the default one, reset it. | |
116 | */ | |
117 | if (unlikely(irq_default_domain == domain)) | |
118 | irq_set_default_host(NULL); | |
119 | ||
120 | mutex_unlock(&irq_domain_mutex); | |
121 | ||
54a90588 | 122 | pr_debug("Removed domain of type %d @0x%p\n", |
58ee99ad PM |
123 | domain->revmap_type, domain); |
124 | ||
125 | irq_domain_free(domain); | |
126 | } | |
ecd84eb2 | 127 | EXPORT_SYMBOL_GPL(irq_domain_remove); |
58ee99ad | 128 | |
1bc04f2c GL |
129 | static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain, |
130 | irq_hw_number_t hwirq) | |
131 | { | |
132 | irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq; | |
133 | int size = domain->revmap_data.legacy.size; | |
134 | ||
135 | if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size)) | |
136 | return 0; | |
137 | return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq; | |
138 | } | |
139 | ||
a8db8cf0 GL |
140 | /** |
141 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
142 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
143 | * @size: total number of irqs in legacy mapping |
144 | * @first_irq: first number of irq block assigned to the domain | |
145 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
146 | * be '0', but a positive integer can be used if the effective | |
147 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
148 | * @ops: map/unmap domain callbacks |
149 | * @host_data: Controller private data pointer | |
150 | * | |
151 | * Note: the map() callback will be called before this function returns | |
152 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
153 | * a legacy controller). | |
154 | */ | |
155 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
156 | unsigned int size, |
157 | unsigned int first_irq, | |
158 | irq_hw_number_t first_hwirq, | |
a18dc81b | 159 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
160 | void *host_data) |
161 | { | |
1bc04f2c | 162 | struct irq_domain *domain; |
a8db8cf0 GL |
163 | unsigned int i; |
164 | ||
165 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data); | |
166 | if (!domain) | |
167 | return NULL; | |
168 | ||
1bc04f2c GL |
169 | domain->revmap_data.legacy.first_irq = first_irq; |
170 | domain->revmap_data.legacy.first_hwirq = first_hwirq; | |
171 | domain->revmap_data.legacy.size = size; | |
172 | ||
cc79ca69 | 173 | mutex_lock(&irq_domain_mutex); |
1bc04f2c GL |
174 | /* Verify that all the irqs are available */ |
175 | for (i = 0; i < size; i++) { | |
176 | int irq = first_irq + i; | |
177 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
178 | ||
179 | if (WARN_ON(!irq_data || irq_data->domain)) { | |
a8db8cf0 | 180 | mutex_unlock(&irq_domain_mutex); |
58ee99ad | 181 | irq_domain_free(domain); |
a8db8cf0 | 182 | return NULL; |
cc79ca69 GL |
183 | } |
184 | } | |
cc79ca69 | 185 | |
1bc04f2c GL |
186 | /* Claim all of the irqs before registering a legacy domain */ |
187 | for (i = 0; i < size; i++) { | |
188 | struct irq_data *irq_data = irq_get_irq_data(first_irq + i); | |
189 | irq_data->hwirq = first_hwirq + i; | |
a8db8cf0 | 190 | irq_data->domain = domain; |
1bc04f2c GL |
191 | } |
192 | mutex_unlock(&irq_domain_mutex); | |
193 | ||
194 | for (i = 0; i < size; i++) { | |
195 | int irq = first_irq + i; | |
196 | int hwirq = first_hwirq + i; | |
197 | ||
198 | /* IRQ0 gets ignored */ | |
199 | if (!irq) | |
200 | continue; | |
a8db8cf0 GL |
201 | |
202 | /* Legacy flags are left to default at this point, | |
203 | * one can then use irq_create_mapping() to | |
204 | * explicitly change them | |
205 | */ | |
1bc04f2c | 206 | ops->map(domain, irq, hwirq); |
a8db8cf0 GL |
207 | |
208 | /* Clear norequest flags */ | |
1bc04f2c | 209 | irq_clear_status_flags(irq, IRQ_NOREQUEST); |
cc79ca69 | 210 | } |
1bc04f2c GL |
211 | |
212 | irq_domain_add(domain); | |
a8db8cf0 GL |
213 | return domain; |
214 | } | |
ecd84eb2 | 215 | EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
a8db8cf0 GL |
216 | |
217 | /** | |
218 | * irq_domain_add_linear() - Allocate and register a legacy revmap irq_domain. | |
219 | * @of_node: pointer to interrupt controller's device tree node. | |
a87487e6 | 220 | * @size: Number of interrupts in the domain. |
a8db8cf0 GL |
221 | * @ops: map/unmap domain callbacks |
222 | * @host_data: Controller private data pointer | |
223 | */ | |
224 | struct irq_domain *irq_domain_add_linear(struct device_node *of_node, | |
225 | unsigned int size, | |
a18dc81b | 226 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
227 | void *host_data) |
228 | { | |
229 | struct irq_domain *domain; | |
230 | unsigned int *revmap; | |
cc79ca69 | 231 | |
a8db8cf0 GL |
232 | revmap = kzalloc(sizeof(*revmap) * size, GFP_KERNEL); |
233 | if (WARN_ON(!revmap)) | |
234 | return NULL; | |
cc79ca69 | 235 | |
a8db8cf0 GL |
236 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data); |
237 | if (!domain) { | |
238 | kfree(revmap); | |
239 | return NULL; | |
240 | } | |
241 | domain->revmap_data.linear.size = size; | |
242 | domain->revmap_data.linear.revmap = revmap; | |
243 | irq_domain_add(domain); | |
244 | return domain; | |
245 | } | |
ecd84eb2 | 246 | EXPORT_SYMBOL_GPL(irq_domain_add_linear); |
a8db8cf0 GL |
247 | |
248 | struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, | |
6fa6c8e2 | 249 | unsigned int max_irq, |
a18dc81b | 250 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
251 | void *host_data) |
252 | { | |
253 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
254 | IRQ_DOMAIN_MAP_NOMAP, ops, host_data); | |
6fa6c8e2 GL |
255 | if (domain) { |
256 | domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0; | |
a8db8cf0 | 257 | irq_domain_add(domain); |
6fa6c8e2 | 258 | } |
a8db8cf0 GL |
259 | return domain; |
260 | } | |
ecd84eb2 | 261 | EXPORT_SYMBOL_GPL(irq_domain_add_nomap); |
a8db8cf0 GL |
262 | |
263 | /** | |
264 | * irq_domain_add_tree() | |
265 | * @of_node: pointer to interrupt controller's device tree node. | |
266 | * @ops: map/unmap domain callbacks | |
267 | * | |
268 | * Note: The radix tree will be allocated later during boot automatically | |
269 | * (the reverse mapping will use the slow path until that happens). | |
270 | */ | |
271 | struct irq_domain *irq_domain_add_tree(struct device_node *of_node, | |
a18dc81b | 272 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
273 | void *host_data) |
274 | { | |
275 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
276 | IRQ_DOMAIN_MAP_TREE, ops, host_data); | |
277 | if (domain) { | |
278 | INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL); | |
279 | irq_domain_add(domain); | |
280 | } | |
68700650 | 281 | return domain; |
cc79ca69 | 282 | } |
ecd84eb2 | 283 | EXPORT_SYMBOL_GPL(irq_domain_add_tree); |
cc79ca69 GL |
284 | |
285 | /** | |
286 | * irq_find_host() - Locates a domain for a given device node | |
287 | * @node: device-tree node of the interrupt controller | |
288 | */ | |
289 | struct irq_domain *irq_find_host(struct device_node *node) | |
290 | { | |
291 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 292 | int rc; |
cc79ca69 GL |
293 | |
294 | /* We might want to match the legacy controller last since | |
295 | * it might potentially be set to match all interrupts in | |
296 | * the absence of a device node. This isn't a problem so far | |
297 | * yet though... | |
298 | */ | |
299 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
300 | list_for_each_entry(h, &irq_domain_list, link) { |
301 | if (h->ops->match) | |
302 | rc = h->ops->match(h, node); | |
303 | else | |
304 | rc = (h->of_node != NULL) && (h->of_node == node); | |
305 | ||
306 | if (rc) { | |
cc79ca69 GL |
307 | found = h; |
308 | break; | |
309 | } | |
a18dc81b | 310 | } |
cc79ca69 GL |
311 | mutex_unlock(&irq_domain_mutex); |
312 | return found; | |
313 | } | |
314 | EXPORT_SYMBOL_GPL(irq_find_host); | |
315 | ||
316 | /** | |
317 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 318 | * @domain: default domain pointer |
cc79ca69 GL |
319 | * |
320 | * For convenience, it's possible to set a "default" domain that will be used | |
321 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
322 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
323 | * aren't properly represented in the device-tree. | |
324 | */ | |
68700650 | 325 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 326 | { |
54a90588 | 327 | pr_debug("Default domain set to @0x%p\n", domain); |
cc79ca69 | 328 | |
68700650 | 329 | irq_default_domain = domain; |
cc79ca69 | 330 | } |
ecd84eb2 | 331 | EXPORT_SYMBOL_GPL(irq_set_default_host); |
cc79ca69 | 332 | |
68700650 | 333 | static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, |
cc79ca69 GL |
334 | irq_hw_number_t hwirq) |
335 | { | |
336 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
337 | ||
338 | irq_data->hwirq = hwirq; | |
68700650 GL |
339 | irq_data->domain = domain; |
340 | if (domain->ops->map(domain, virq, hwirq)) { | |
54a90588 | 341 | pr_debug("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq); |
cc79ca69 GL |
342 | irq_data->domain = NULL; |
343 | irq_data->hwirq = 0; | |
344 | return -1; | |
345 | } | |
346 | ||
347 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | /** | |
353 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 354 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
355 | * |
356 | * This routine is used for irq controllers which can choose the hardware | |
357 | * interrupt numbers they generate. In such a case it's simplest to use | |
358 | * the linux irq as the hardware interrupt number. | |
359 | */ | |
68700650 | 360 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
361 | { |
362 | unsigned int virq; | |
363 | ||
68700650 GL |
364 | if (domain == NULL) |
365 | domain = irq_default_domain; | |
cc79ca69 | 366 | |
68700650 GL |
367 | BUG_ON(domain == NULL); |
368 | WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP); | |
cc79ca69 GL |
369 | |
370 | virq = irq_alloc_desc_from(1, 0); | |
03848373 | 371 | if (!virq) { |
54a90588 | 372 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 373 | return 0; |
cc79ca69 | 374 | } |
6fa6c8e2 | 375 | if (virq >= domain->revmap_data.nomap.max_irq) { |
cc79ca69 | 376 | pr_err("ERROR: no free irqs available below %i maximum\n", |
6fa6c8e2 | 377 | domain->revmap_data.nomap.max_irq); |
cc79ca69 GL |
378 | irq_free_desc(virq); |
379 | return 0; | |
380 | } | |
54a90588 | 381 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 382 | |
68700650 | 383 | if (irq_setup_virq(domain, virq, virq)) { |
cc79ca69 | 384 | irq_free_desc(virq); |
03848373 | 385 | return 0; |
cc79ca69 GL |
386 | } |
387 | ||
388 | return virq; | |
389 | } | |
ecd84eb2 | 390 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
391 | |
392 | /** | |
393 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
394 | * @domain: domain owning this hardware interrupt or NULL for default domain |
395 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
396 | * |
397 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
398 | * irq number. | |
399 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
400 | * on the number returned from that call. | |
401 | */ | |
68700650 | 402 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
403 | irq_hw_number_t hwirq) |
404 | { | |
5b7526e3 DD |
405 | unsigned int hint; |
406 | int virq; | |
cc79ca69 | 407 | |
54a90588 | 408 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 409 | |
68700650 GL |
410 | /* Look for default domain if nececssary */ |
411 | if (domain == NULL) | |
412 | domain = irq_default_domain; | |
413 | if (domain == NULL) { | |
54a90588 PM |
414 | pr_warning("irq_create_mapping called for" |
415 | " NULL domain, hwirq=%lx\n", hwirq); | |
cc79ca69 | 416 | WARN_ON(1); |
03848373 | 417 | return 0; |
cc79ca69 | 418 | } |
54a90588 | 419 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
420 | |
421 | /* Check if mapping already exists */ | |
68700650 | 422 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 423 | if (virq) { |
54a90588 | 424 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
425 | return virq; |
426 | } | |
427 | ||
428 | /* Get a virtual interrupt number */ | |
1bc04f2c GL |
429 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
430 | return irq_domain_legacy_revmap(domain, hwirq); | |
431 | ||
432 | /* Allocate a virtual interrupt number */ | |
6fa6c8e2 | 433 | hint = hwirq % nr_irqs; |
1bc04f2c GL |
434 | if (hint == 0) |
435 | hint++; | |
436 | virq = irq_alloc_desc_from(hint, 0); | |
5b7526e3 | 437 | if (virq <= 0) |
1bc04f2c | 438 | virq = irq_alloc_desc_from(1, 0); |
5b7526e3 | 439 | if (virq <= 0) { |
54a90588 | 440 | pr_debug("-> virq allocation failed\n"); |
1bc04f2c | 441 | return 0; |
cc79ca69 GL |
442 | } |
443 | ||
68700650 GL |
444 | if (irq_setup_virq(domain, virq, hwirq)) { |
445 | if (domain->revmap_type != IRQ_DOMAIN_MAP_LEGACY) | |
cc79ca69 | 446 | irq_free_desc(virq); |
03848373 | 447 | return 0; |
cc79ca69 GL |
448 | } |
449 | ||
54a90588 | 450 | pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", |
68700650 | 451 | hwirq, domain->of_node ? domain->of_node->full_name : "null", virq); |
cc79ca69 GL |
452 | |
453 | return virq; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
456 | ||
457 | unsigned int irq_create_of_mapping(struct device_node *controller, | |
458 | const u32 *intspec, unsigned int intsize) | |
459 | { | |
68700650 | 460 | struct irq_domain *domain; |
cc79ca69 GL |
461 | irq_hw_number_t hwirq; |
462 | unsigned int type = IRQ_TYPE_NONE; | |
463 | unsigned int virq; | |
464 | ||
68700650 GL |
465 | domain = controller ? irq_find_host(controller) : irq_default_domain; |
466 | if (!domain) { | |
abd2363f GL |
467 | #ifdef CONFIG_MIPS |
468 | /* | |
469 | * Workaround to avoid breaking interrupt controller drivers | |
470 | * that don't yet register an irq_domain. This is temporary | |
471 | * code. ~~~gcl, Feb 24, 2012 | |
472 | * | |
473 | * Scheduled for removal in Linux v3.6. That should be enough | |
474 | * time. | |
475 | */ | |
476 | if (intsize > 0) | |
477 | return intspec[0]; | |
478 | #endif | |
54a90588 PM |
479 | pr_warning("no irq domain found for %s !\n", |
480 | controller->full_name); | |
03848373 | 481 | return 0; |
cc79ca69 GL |
482 | } |
483 | ||
68700650 GL |
484 | /* If domain has no translation, then we assume interrupt line */ |
485 | if (domain->ops->xlate == NULL) | |
cc79ca69 GL |
486 | hwirq = intspec[0]; |
487 | else { | |
68700650 | 488 | if (domain->ops->xlate(domain, controller, intspec, intsize, |
cc79ca69 | 489 | &hwirq, &type)) |
03848373 | 490 | return 0; |
cc79ca69 GL |
491 | } |
492 | ||
493 | /* Create mapping */ | |
68700650 | 494 | virq = irq_create_mapping(domain, hwirq); |
03848373 | 495 | if (!virq) |
cc79ca69 GL |
496 | return virq; |
497 | ||
498 | /* Set type if specified and different than the current one */ | |
499 | if (type != IRQ_TYPE_NONE && | |
500 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) | |
501 | irq_set_irq_type(virq, type); | |
502 | return virq; | |
503 | } | |
504 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
505 | ||
506 | /** | |
507 | * irq_dispose_mapping() - Unmap an interrupt | |
508 | * @virq: linux irq number of the interrupt to unmap | |
509 | */ | |
510 | void irq_dispose_mapping(unsigned int virq) | |
511 | { | |
512 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 513 | struct irq_domain *domain; |
cc79ca69 GL |
514 | irq_hw_number_t hwirq; |
515 | ||
03848373 | 516 | if (!virq || !irq_data) |
cc79ca69 GL |
517 | return; |
518 | ||
68700650 GL |
519 | domain = irq_data->domain; |
520 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
521 | return; |
522 | ||
523 | /* Never unmap legacy interrupts */ | |
68700650 | 524 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
cc79ca69 GL |
525 | return; |
526 | ||
527 | irq_set_status_flags(virq, IRQ_NOREQUEST); | |
528 | ||
529 | /* remove chip and handler */ | |
530 | irq_set_chip_and_handler(virq, NULL, NULL); | |
531 | ||
532 | /* Make sure it's completed */ | |
533 | synchronize_irq(virq); | |
534 | ||
535 | /* Tell the PIC about it */ | |
68700650 GL |
536 | if (domain->ops->unmap) |
537 | domain->ops->unmap(domain, virq); | |
cc79ca69 GL |
538 | smp_mb(); |
539 | ||
540 | /* Clear reverse map */ | |
541 | hwirq = irq_data->hwirq; | |
68700650 | 542 | switch(domain->revmap_type) { |
cc79ca69 | 543 | case IRQ_DOMAIN_MAP_LINEAR: |
68700650 GL |
544 | if (hwirq < domain->revmap_data.linear.size) |
545 | domain->revmap_data.linear.revmap[hwirq] = 0; | |
cc79ca69 GL |
546 | break; |
547 | case IRQ_DOMAIN_MAP_TREE: | |
548 | mutex_lock(&revmap_trees_mutex); | |
68700650 | 549 | radix_tree_delete(&domain->revmap_data.tree, hwirq); |
cc79ca69 GL |
550 | mutex_unlock(&revmap_trees_mutex); |
551 | break; | |
552 | } | |
553 | ||
cc79ca69 GL |
554 | irq_free_desc(virq); |
555 | } | |
556 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
557 | ||
558 | /** | |
559 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
560 | * @domain: domain owning this hardware interrupt |
561 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
562 | * |
563 | * This is a slow path, for use by generic code. It's expected that an | |
564 | * irq controller implementation directly calls the appropriate low level | |
565 | * mapping function. | |
566 | */ | |
68700650 | 567 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
568 | irq_hw_number_t hwirq) |
569 | { | |
570 | unsigned int i; | |
6fa6c8e2 | 571 | unsigned int hint = hwirq % nr_irqs; |
cc79ca69 | 572 | |
68700650 GL |
573 | /* Look for default domain if nececssary */ |
574 | if (domain == NULL) | |
575 | domain = irq_default_domain; | |
576 | if (domain == NULL) | |
03848373 | 577 | return 0; |
cc79ca69 GL |
578 | |
579 | /* legacy -> bail early */ | |
68700650 | 580 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
1bc04f2c | 581 | return irq_domain_legacy_revmap(domain, hwirq); |
cc79ca69 GL |
582 | |
583 | /* Slow path does a linear search of the map */ | |
584 | if (hint == 0) | |
585 | hint = 1; | |
586 | i = hint; | |
587 | do { | |
588 | struct irq_data *data = irq_get_irq_data(i); | |
68700650 | 589 | if (data && (data->domain == domain) && (data->hwirq == hwirq)) |
cc79ca69 GL |
590 | return i; |
591 | i++; | |
6fa6c8e2 | 592 | if (i >= nr_irqs) |
cc79ca69 GL |
593 | i = 1; |
594 | } while(i != hint); | |
03848373 | 595 | return 0; |
cc79ca69 GL |
596 | } |
597 | EXPORT_SYMBOL_GPL(irq_find_mapping); | |
598 | ||
599 | /** | |
600 | * irq_radix_revmap_lookup() - Find a linux irq from a hw irq number. | |
68700650 GL |
601 | * @domain: domain owning this hardware interrupt |
602 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
603 | * |
604 | * This is a fast path, for use by irq controller code that uses radix tree | |
605 | * revmaps | |
606 | */ | |
68700650 | 607 | unsigned int irq_radix_revmap_lookup(struct irq_domain *domain, |
cc79ca69 GL |
608 | irq_hw_number_t hwirq) |
609 | { | |
610 | struct irq_data *irq_data; | |
611 | ||
68700650 GL |
612 | if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_TREE)) |
613 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
614 | |
615 | /* | |
616 | * Freeing an irq can delete nodes along the path to | |
617 | * do the lookup via call_rcu. | |
618 | */ | |
619 | rcu_read_lock(); | |
68700650 | 620 | irq_data = radix_tree_lookup(&domain->revmap_data.tree, hwirq); |
cc79ca69 GL |
621 | rcu_read_unlock(); |
622 | ||
623 | /* | |
624 | * If found in radix tree, then fine. | |
625 | * Else fallback to linear lookup - this should not happen in practice | |
626 | * as it means that we failed to insert the node in the radix tree. | |
627 | */ | |
68700650 | 628 | return irq_data ? irq_data->irq : irq_find_mapping(domain, hwirq); |
cc79ca69 | 629 | } |
ecd84eb2 | 630 | EXPORT_SYMBOL_GPL(irq_radix_revmap_lookup); |
cc79ca69 GL |
631 | |
632 | /** | |
633 | * irq_radix_revmap_insert() - Insert a hw irq to linux irq number mapping. | |
68700650 | 634 | * @domain: domain owning this hardware interrupt |
cc79ca69 | 635 | * @virq: linux irq number |
68700650 | 636 | * @hwirq: hardware irq number in that domain space |
cc79ca69 GL |
637 | * |
638 | * This is for use by irq controllers that use a radix tree reverse | |
639 | * mapping for fast lookup. | |
640 | */ | |
68700650 | 641 | void irq_radix_revmap_insert(struct irq_domain *domain, unsigned int virq, |
cc79ca69 GL |
642 | irq_hw_number_t hwirq) |
643 | { | |
644 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
645 | ||
68700650 | 646 | if (WARN_ON(domain->revmap_type != IRQ_DOMAIN_MAP_TREE)) |
cc79ca69 GL |
647 | return; |
648 | ||
03848373 | 649 | if (virq) { |
cc79ca69 | 650 | mutex_lock(&revmap_trees_mutex); |
68700650 | 651 | radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data); |
cc79ca69 GL |
652 | mutex_unlock(&revmap_trees_mutex); |
653 | } | |
654 | } | |
ecd84eb2 | 655 | EXPORT_SYMBOL_GPL(irq_radix_revmap_insert); |
cc79ca69 GL |
656 | |
657 | /** | |
658 | * irq_linear_revmap() - Find a linux irq from a hw irq number. | |
68700650 GL |
659 | * @domain: domain owning this hardware interrupt |
660 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
661 | * |
662 | * This is a fast path, for use by irq controller code that uses linear | |
663 | * revmaps. It does fallback to the slow path if the revmap doesn't exist | |
664 | * yet and will create the revmap entry with appropriate locking | |
665 | */ | |
68700650 | 666 | unsigned int irq_linear_revmap(struct irq_domain *domain, |
cc79ca69 GL |
667 | irq_hw_number_t hwirq) |
668 | { | |
669 | unsigned int *revmap; | |
670 | ||
68700650 GL |
671 | if (WARN_ON_ONCE(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR)) |
672 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
673 | |
674 | /* Check revmap bounds */ | |
68700650 GL |
675 | if (unlikely(hwirq >= domain->revmap_data.linear.size)) |
676 | return irq_find_mapping(domain, hwirq); | |
cc79ca69 GL |
677 | |
678 | /* Check if revmap was allocated */ | |
68700650 | 679 | revmap = domain->revmap_data.linear.revmap; |
cc79ca69 | 680 | if (unlikely(revmap == NULL)) |
68700650 | 681 | return irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
682 | |
683 | /* Fill up revmap with slow path if no mapping found */ | |
03848373 | 684 | if (unlikely(!revmap[hwirq])) |
68700650 | 685 | revmap[hwirq] = irq_find_mapping(domain, hwirq); |
cc79ca69 GL |
686 | |
687 | return revmap[hwirq]; | |
688 | } | |
ecd84eb2 | 689 | EXPORT_SYMBOL_GPL(irq_linear_revmap); |
cc79ca69 | 690 | |
092b2fb0 | 691 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
692 | static int virq_debug_show(struct seq_file *m, void *private) |
693 | { | |
694 | unsigned long flags; | |
695 | struct irq_desc *desc; | |
696 | const char *p; | |
697 | static const char none[] = "none"; | |
698 | void *data; | |
699 | int i; | |
700 | ||
15e06bf6 | 701 | seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq", |
5269a9ab GL |
702 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
703 | "domain name"); | |
cc79ca69 GL |
704 | |
705 | for (i = 1; i < nr_irqs; i++) { | |
706 | desc = irq_to_desc(i); | |
707 | if (!desc) | |
708 | continue; | |
709 | ||
710 | raw_spin_lock_irqsave(&desc->lock, flags); | |
711 | ||
712 | if (desc->action && desc->action->handler) { | |
713 | struct irq_chip *chip; | |
714 | ||
715 | seq_printf(m, "%5d ", i); | |
716 | seq_printf(m, "0x%05lx ", desc->irq_data.hwirq); | |
717 | ||
718 | chip = irq_desc_get_chip(desc); | |
719 | if (chip && chip->name) | |
720 | p = chip->name; | |
721 | else | |
722 | p = none; | |
723 | seq_printf(m, "%-15s ", p); | |
724 | ||
725 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 726 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 727 | |
092b2fb0 | 728 | if (desc->irq_data.domain && desc->irq_data.domain->of_node) |
cc79ca69 GL |
729 | p = desc->irq_data.domain->of_node->full_name; |
730 | else | |
731 | p = none; | |
732 | seq_printf(m, "%s\n", p); | |
733 | } | |
734 | ||
735 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
736 | } | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
741 | static int virq_debug_open(struct inode *inode, struct file *file) | |
742 | { | |
743 | return single_open(file, virq_debug_show, inode->i_private); | |
744 | } | |
745 | ||
746 | static const struct file_operations virq_debug_fops = { | |
747 | .open = virq_debug_open, | |
748 | .read = seq_read, | |
749 | .llseek = seq_lseek, | |
750 | .release = single_release, | |
751 | }; | |
752 | ||
753 | static int __init irq_debugfs_init(void) | |
754 | { | |
092b2fb0 | 755 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
756 | NULL, &virq_debug_fops) == NULL) |
757 | return -ENOMEM; | |
758 | ||
759 | return 0; | |
760 | } | |
761 | __initcall(irq_debugfs_init); | |
092b2fb0 | 762 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 763 | |
5c5806e5 PM |
764 | static int irq_domain_simple_map(struct irq_domain *d, unsigned int irq, |
765 | irq_hw_number_t hwirq) | |
08a543ad | 766 | { |
75294957 | 767 | return 0; |
08a543ad | 768 | } |
7e713301 | 769 | |
16b2e6e2 GL |
770 | /** |
771 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
772 | * | |
773 | * Device Tree IRQ specifier translation function which works with one cell | |
774 | * bindings where the cell value maps directly to the hwirq number. | |
775 | */ | |
776 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
777 | const u32 *intspec, unsigned int intsize, | |
778 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 779 | { |
16b2e6e2 | 780 | if (WARN_ON(intsize < 1)) |
7e713301 | 781 | return -EINVAL; |
7e713301 GL |
782 | *out_hwirq = intspec[0]; |
783 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
784 | return 0; |
785 | } | |
16b2e6e2 GL |
786 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
787 | ||
788 | /** | |
789 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
790 | * | |
791 | * Device Tree IRQ specifier translation function which works with two cell | |
792 | * bindings where the cell values map directly to the hwirq number | |
793 | * and linux irq flags. | |
794 | */ | |
795 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
796 | const u32 *intspec, unsigned int intsize, | |
797 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
798 | { | |
799 | if (WARN_ON(intsize < 2)) | |
800 | return -EINVAL; | |
801 | *out_hwirq = intspec[0]; | |
802 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
803 | return 0; | |
804 | } | |
805 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
806 | ||
807 | /** | |
808 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
809 | * | |
810 | * Device Tree IRQ specifier translation function which works with either one | |
811 | * or two cell bindings where the cell values map directly to the hwirq number | |
812 | * and linux irq flags. | |
813 | * | |
814 | * Note: don't use this function unless your interrupt controller explicitly | |
815 | * supports both one and two cell bindings. For the majority of controllers | |
816 | * the _onecell() or _twocell() variants above should be used. | |
817 | */ | |
818 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
819 | struct device_node *ctrlr, | |
820 | const u32 *intspec, unsigned int intsize, | |
821 | unsigned long *out_hwirq, unsigned int *out_type) | |
822 | { | |
823 | if (WARN_ON(intsize < 1)) | |
824 | return -EINVAL; | |
825 | *out_hwirq = intspec[0]; | |
826 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
827 | return 0; | |
828 | } | |
829 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 830 | |
a18dc81b | 831 | const struct irq_domain_ops irq_domain_simple_ops = { |
75294957 | 832 | .map = irq_domain_simple_map, |
16b2e6e2 | 833 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
834 | }; |
835 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
836 | ||
837 | #ifdef CONFIG_OF_IRQ | |
7e713301 GL |
838 | void irq_domain_generate_simple(const struct of_device_id *match, |
839 | u64 phys_base, unsigned int irq_start) | |
840 | { | |
841 | struct device_node *node; | |
e1964c50 | 842 | pr_debug("looking for phys_base=%llx, irq_start=%i\n", |
7e713301 GL |
843 | (unsigned long long) phys_base, (int) irq_start); |
844 | node = of_find_matching_node_by_address(NULL, match, phys_base); | |
845 | if (node) | |
6b783f7c GL |
846 | irq_domain_add_legacy(node, 32, irq_start, 0, |
847 | &irq_domain_simple_ops, NULL); | |
7e713301 GL |
848 | } |
849 | EXPORT_SYMBOL_GPL(irq_domain_generate_simple); | |
75294957 | 850 | #endif |