Commit | Line | Data |
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54a90588 PM |
1 | #define pr_fmt(fmt) "irq: " fmt |
2 | ||
cc79ca69 GL |
3 | #include <linux/debugfs.h> |
4 | #include <linux/hardirq.h> | |
5 | #include <linux/interrupt.h> | |
08a543ad | 6 | #include <linux/irq.h> |
cc79ca69 | 7 | #include <linux/irqdesc.h> |
08a543ad GL |
8 | #include <linux/irqdomain.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/mutex.h> | |
11 | #include <linux/of.h> | |
7e713301 | 12 | #include <linux/of_address.h> |
5ca4db61 | 13 | #include <linux/topology.h> |
cc79ca69 | 14 | #include <linux/seq_file.h> |
7e713301 | 15 | #include <linux/slab.h> |
cc79ca69 GL |
16 | #include <linux/smp.h> |
17 | #include <linux/fs.h> | |
08a543ad | 18 | |
1bc04f2c GL |
19 | #define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs. |
20 | * ie. legacy 8259, gets irqs 1..15 */ | |
a8db8cf0 GL |
21 | #define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */ |
22 | #define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */ | |
23 | #define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */ | |
24 | ||
08a543ad GL |
25 | static LIST_HEAD(irq_domain_list); |
26 | static DEFINE_MUTEX(irq_domain_mutex); | |
27 | ||
cc79ca69 | 28 | static DEFINE_MUTEX(revmap_trees_mutex); |
68700650 | 29 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 30 | |
cc79ca69 | 31 | /** |
a8db8cf0 | 32 | * irq_domain_alloc() - Allocate a new irq_domain data structure |
cc79ca69 GL |
33 | * @of_node: optional device-tree node of the interrupt controller |
34 | * @revmap_type: type of reverse mapping to use | |
68700650 | 35 | * @ops: map/unmap domain callbacks |
a8db8cf0 | 36 | * @host_data: Controller private data pointer |
cc79ca69 | 37 | * |
a8db8cf0 GL |
38 | * Allocates and initialize and irq_domain structure. Caller is expected to |
39 | * register allocated irq_domain with irq_domain_register(). Returns pointer | |
40 | * to IRQ domain, or NULL on failure. | |
cc79ca69 | 41 | */ |
a8db8cf0 GL |
42 | static struct irq_domain *irq_domain_alloc(struct device_node *of_node, |
43 | unsigned int revmap_type, | |
a18dc81b | 44 | const struct irq_domain_ops *ops, |
a8db8cf0 | 45 | void *host_data) |
cc79ca69 | 46 | { |
a8db8cf0 | 47 | struct irq_domain *domain; |
cc79ca69 | 48 | |
5ca4db61 PM |
49 | domain = kzalloc_node(sizeof(*domain), GFP_KERNEL, |
50 | of_node_to_nid(of_node)); | |
a8db8cf0 | 51 | if (WARN_ON(!domain)) |
cc79ca69 GL |
52 | return NULL; |
53 | ||
54 | /* Fill structure */ | |
68700650 | 55 | domain->revmap_type = revmap_type; |
68700650 | 56 | domain->ops = ops; |
a8db8cf0 | 57 | domain->host_data = host_data; |
68700650 | 58 | domain->of_node = of_node_get(of_node); |
cc79ca69 | 59 | |
a8db8cf0 GL |
60 | return domain; |
61 | } | |
62 | ||
58ee99ad PM |
63 | static void irq_domain_free(struct irq_domain *domain) |
64 | { | |
65 | of_node_put(domain->of_node); | |
66 | kfree(domain); | |
67 | } | |
68 | ||
a8db8cf0 GL |
69 | static void irq_domain_add(struct irq_domain *domain) |
70 | { | |
71 | mutex_lock(&irq_domain_mutex); | |
72 | list_add(&domain->link, &irq_domain_list); | |
73 | mutex_unlock(&irq_domain_mutex); | |
54a90588 | 74 | pr_debug("Allocated domain of type %d @0x%p\n", |
a8db8cf0 GL |
75 | domain->revmap_type, domain); |
76 | } | |
77 | ||
58ee99ad PM |
78 | /** |
79 | * irq_domain_remove() - Remove an irq domain. | |
80 | * @domain: domain to remove | |
81 | * | |
82 | * This routine is used to remove an irq domain. The caller must ensure | |
83 | * that all mappings within the domain have been disposed of prior to | |
84 | * use, depending on the revmap type. | |
85 | */ | |
86 | void irq_domain_remove(struct irq_domain *domain) | |
87 | { | |
88 | mutex_lock(&irq_domain_mutex); | |
89 | ||
90 | switch (domain->revmap_type) { | |
91 | case IRQ_DOMAIN_MAP_LEGACY: | |
92 | /* | |
93 | * Legacy domains don't manage their own irq_desc | |
94 | * allocations, we expect the caller to handle irq_desc | |
95 | * freeing on their own. | |
96 | */ | |
97 | break; | |
98 | case IRQ_DOMAIN_MAP_TREE: | |
99 | /* | |
100 | * radix_tree_delete() takes care of destroying the root | |
101 | * node when all entries are removed. Shout if there are | |
102 | * any mappings left. | |
103 | */ | |
104 | WARN_ON(domain->revmap_data.tree.height); | |
105 | break; | |
106 | case IRQ_DOMAIN_MAP_LINEAR: | |
107 | kfree(domain->revmap_data.linear.revmap); | |
108 | domain->revmap_data.linear.size = 0; | |
109 | break; | |
110 | case IRQ_DOMAIN_MAP_NOMAP: | |
111 | break; | |
112 | } | |
113 | ||
114 | list_del(&domain->link); | |
115 | ||
116 | /* | |
117 | * If the going away domain is the default one, reset it. | |
118 | */ | |
119 | if (unlikely(irq_default_domain == domain)) | |
120 | irq_set_default_host(NULL); | |
121 | ||
122 | mutex_unlock(&irq_domain_mutex); | |
123 | ||
54a90588 | 124 | pr_debug("Removed domain of type %d @0x%p\n", |
58ee99ad PM |
125 | domain->revmap_type, domain); |
126 | ||
127 | irq_domain_free(domain); | |
128 | } | |
ecd84eb2 | 129 | EXPORT_SYMBOL_GPL(irq_domain_remove); |
58ee99ad | 130 | |
1bc04f2c GL |
131 | static unsigned int irq_domain_legacy_revmap(struct irq_domain *domain, |
132 | irq_hw_number_t hwirq) | |
133 | { | |
134 | irq_hw_number_t first_hwirq = domain->revmap_data.legacy.first_hwirq; | |
135 | int size = domain->revmap_data.legacy.size; | |
136 | ||
137 | if (WARN_ON(hwirq < first_hwirq || hwirq >= first_hwirq + size)) | |
138 | return 0; | |
139 | return hwirq - first_hwirq + domain->revmap_data.legacy.first_irq; | |
140 | } | |
141 | ||
781d0f46 MB |
142 | /** |
143 | * irq_domain_add_simple() - Allocate and register a simple irq_domain. | |
144 | * @of_node: pointer to interrupt controller's device tree node. | |
145 | * @size: total number of irqs in mapping | |
94a63da0 LW |
146 | * @first_irq: first number of irq block assigned to the domain, |
147 | * pass zero to assign irqs on-the-fly. This will result in a | |
148 | * linear IRQ domain so it is important to use irq_create_mapping() | |
149 | * for each used IRQ, especially when SPARSE_IRQ is enabled. | |
781d0f46 MB |
150 | * @ops: map/unmap domain callbacks |
151 | * @host_data: Controller private data pointer | |
152 | * | |
153 | * Allocates a legacy irq_domain if irq_base is positive or a linear | |
2854d167 LW |
154 | * domain otherwise. For the legacy domain, IRQ descriptors will also |
155 | * be allocated. | |
781d0f46 MB |
156 | * |
157 | * This is intended to implement the expected behaviour for most | |
158 | * interrupt controllers which is that a linear mapping should | |
159 | * normally be used unless the system requires a legacy mapping in | |
160 | * order to support supplying interrupt numbers during non-DT | |
161 | * registration of devices. | |
162 | */ | |
163 | struct irq_domain *irq_domain_add_simple(struct device_node *of_node, | |
164 | unsigned int size, | |
165 | unsigned int first_irq, | |
166 | const struct irq_domain_ops *ops, | |
167 | void *host_data) | |
168 | { | |
2854d167 LW |
169 | if (first_irq > 0) { |
170 | int irq_base; | |
171 | ||
172 | if (IS_ENABLED(CONFIG_SPARSE_IRQ)) { | |
173 | /* | |
174 | * Set the descriptor allocator to search for a | |
175 | * 1-to-1 mapping, such as irq_alloc_desc_at(). | |
176 | * Use of_node_to_nid() which is defined to | |
177 | * numa_node_id() on platforms that have no custom | |
178 | * implementation. | |
179 | */ | |
180 | irq_base = irq_alloc_descs(first_irq, first_irq, size, | |
181 | of_node_to_nid(of_node)); | |
182 | if (irq_base < 0) { | |
d202b7b9 LW |
183 | pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", |
184 | first_irq); | |
2854d167 LW |
185 | irq_base = first_irq; |
186 | } | |
187 | } else | |
188 | irq_base = first_irq; | |
189 | ||
190 | return irq_domain_add_legacy(of_node, size, irq_base, 0, | |
781d0f46 | 191 | ops, host_data); |
2854d167 LW |
192 | } |
193 | ||
194 | /* A linear domain is the default */ | |
195 | return irq_domain_add_linear(of_node, size, ops, host_data); | |
781d0f46 | 196 | } |
346dbb79 | 197 | EXPORT_SYMBOL_GPL(irq_domain_add_simple); |
781d0f46 | 198 | |
a8db8cf0 GL |
199 | /** |
200 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
201 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
202 | * @size: total number of irqs in legacy mapping |
203 | * @first_irq: first number of irq block assigned to the domain | |
204 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
205 | * be '0', but a positive integer can be used if the effective | |
206 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
207 | * @ops: map/unmap domain callbacks |
208 | * @host_data: Controller private data pointer | |
209 | * | |
210 | * Note: the map() callback will be called before this function returns | |
211 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
212 | * a legacy controller). | |
213 | */ | |
214 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
215 | unsigned int size, |
216 | unsigned int first_irq, | |
217 | irq_hw_number_t first_hwirq, | |
a18dc81b | 218 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
219 | void *host_data) |
220 | { | |
1bc04f2c | 221 | struct irq_domain *domain; |
a8db8cf0 GL |
222 | unsigned int i; |
223 | ||
224 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LEGACY, ops, host_data); | |
225 | if (!domain) | |
226 | return NULL; | |
227 | ||
1bc04f2c GL |
228 | domain->revmap_data.legacy.first_irq = first_irq; |
229 | domain->revmap_data.legacy.first_hwirq = first_hwirq; | |
230 | domain->revmap_data.legacy.size = size; | |
231 | ||
cc79ca69 | 232 | mutex_lock(&irq_domain_mutex); |
1bc04f2c GL |
233 | /* Verify that all the irqs are available */ |
234 | for (i = 0; i < size; i++) { | |
235 | int irq = first_irq + i; | |
236 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
237 | ||
238 | if (WARN_ON(!irq_data || irq_data->domain)) { | |
a8db8cf0 | 239 | mutex_unlock(&irq_domain_mutex); |
58ee99ad | 240 | irq_domain_free(domain); |
a8db8cf0 | 241 | return NULL; |
cc79ca69 GL |
242 | } |
243 | } | |
cc79ca69 | 244 | |
1bc04f2c GL |
245 | /* Claim all of the irqs before registering a legacy domain */ |
246 | for (i = 0; i < size; i++) { | |
247 | struct irq_data *irq_data = irq_get_irq_data(first_irq + i); | |
248 | irq_data->hwirq = first_hwirq + i; | |
a8db8cf0 | 249 | irq_data->domain = domain; |
1bc04f2c GL |
250 | } |
251 | mutex_unlock(&irq_domain_mutex); | |
252 | ||
253 | for (i = 0; i < size; i++) { | |
254 | int irq = first_irq + i; | |
255 | int hwirq = first_hwirq + i; | |
256 | ||
257 | /* IRQ0 gets ignored */ | |
258 | if (!irq) | |
259 | continue; | |
a8db8cf0 GL |
260 | |
261 | /* Legacy flags are left to default at this point, | |
262 | * one can then use irq_create_mapping() to | |
263 | * explicitly change them | |
264 | */ | |
aed98048 GL |
265 | if (ops->map) |
266 | ops->map(domain, irq, hwirq); | |
a8db8cf0 GL |
267 | |
268 | /* Clear norequest flags */ | |
1bc04f2c | 269 | irq_clear_status_flags(irq, IRQ_NOREQUEST); |
cc79ca69 | 270 | } |
1bc04f2c GL |
271 | |
272 | irq_domain_add(domain); | |
a8db8cf0 GL |
273 | return domain; |
274 | } | |
ecd84eb2 | 275 | EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
a8db8cf0 GL |
276 | |
277 | /** | |
22076c77 | 278 | * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain. |
a8db8cf0 | 279 | * @of_node: pointer to interrupt controller's device tree node. |
a87487e6 | 280 | * @size: Number of interrupts in the domain. |
a8db8cf0 GL |
281 | * @ops: map/unmap domain callbacks |
282 | * @host_data: Controller private data pointer | |
283 | */ | |
284 | struct irq_domain *irq_domain_add_linear(struct device_node *of_node, | |
285 | unsigned int size, | |
a18dc81b | 286 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
287 | void *host_data) |
288 | { | |
289 | struct irq_domain *domain; | |
290 | unsigned int *revmap; | |
cc79ca69 | 291 | |
5ca4db61 PM |
292 | revmap = kzalloc_node(sizeof(*revmap) * size, GFP_KERNEL, |
293 | of_node_to_nid(of_node)); | |
a8db8cf0 GL |
294 | if (WARN_ON(!revmap)) |
295 | return NULL; | |
cc79ca69 | 296 | |
a8db8cf0 GL |
297 | domain = irq_domain_alloc(of_node, IRQ_DOMAIN_MAP_LINEAR, ops, host_data); |
298 | if (!domain) { | |
299 | kfree(revmap); | |
300 | return NULL; | |
301 | } | |
302 | domain->revmap_data.linear.size = size; | |
303 | domain->revmap_data.linear.revmap = revmap; | |
304 | irq_domain_add(domain); | |
305 | return domain; | |
306 | } | |
ecd84eb2 | 307 | EXPORT_SYMBOL_GPL(irq_domain_add_linear); |
a8db8cf0 GL |
308 | |
309 | struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, | |
6fa6c8e2 | 310 | unsigned int max_irq, |
a18dc81b | 311 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
312 | void *host_data) |
313 | { | |
314 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
315 | IRQ_DOMAIN_MAP_NOMAP, ops, host_data); | |
6fa6c8e2 GL |
316 | if (domain) { |
317 | domain->revmap_data.nomap.max_irq = max_irq ? max_irq : ~0; | |
a8db8cf0 | 318 | irq_domain_add(domain); |
6fa6c8e2 | 319 | } |
a8db8cf0 GL |
320 | return domain; |
321 | } | |
ecd84eb2 | 322 | EXPORT_SYMBOL_GPL(irq_domain_add_nomap); |
a8db8cf0 GL |
323 | |
324 | /** | |
325 | * irq_domain_add_tree() | |
326 | * @of_node: pointer to interrupt controller's device tree node. | |
327 | * @ops: map/unmap domain callbacks | |
328 | * | |
329 | * Note: The radix tree will be allocated later during boot automatically | |
330 | * (the reverse mapping will use the slow path until that happens). | |
331 | */ | |
332 | struct irq_domain *irq_domain_add_tree(struct device_node *of_node, | |
a18dc81b | 333 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
334 | void *host_data) |
335 | { | |
336 | struct irq_domain *domain = irq_domain_alloc(of_node, | |
337 | IRQ_DOMAIN_MAP_TREE, ops, host_data); | |
338 | if (domain) { | |
339 | INIT_RADIX_TREE(&domain->revmap_data.tree, GFP_KERNEL); | |
340 | irq_domain_add(domain); | |
341 | } | |
68700650 | 342 | return domain; |
cc79ca69 | 343 | } |
ecd84eb2 | 344 | EXPORT_SYMBOL_GPL(irq_domain_add_tree); |
cc79ca69 GL |
345 | |
346 | /** | |
347 | * irq_find_host() - Locates a domain for a given device node | |
348 | * @node: device-tree node of the interrupt controller | |
349 | */ | |
350 | struct irq_domain *irq_find_host(struct device_node *node) | |
351 | { | |
352 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 353 | int rc; |
cc79ca69 GL |
354 | |
355 | /* We might want to match the legacy controller last since | |
356 | * it might potentially be set to match all interrupts in | |
357 | * the absence of a device node. This isn't a problem so far | |
358 | * yet though... | |
359 | */ | |
360 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
361 | list_for_each_entry(h, &irq_domain_list, link) { |
362 | if (h->ops->match) | |
363 | rc = h->ops->match(h, node); | |
364 | else | |
365 | rc = (h->of_node != NULL) && (h->of_node == node); | |
366 | ||
367 | if (rc) { | |
cc79ca69 GL |
368 | found = h; |
369 | break; | |
370 | } | |
a18dc81b | 371 | } |
cc79ca69 GL |
372 | mutex_unlock(&irq_domain_mutex); |
373 | return found; | |
374 | } | |
375 | EXPORT_SYMBOL_GPL(irq_find_host); | |
376 | ||
377 | /** | |
378 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 379 | * @domain: default domain pointer |
cc79ca69 GL |
380 | * |
381 | * For convenience, it's possible to set a "default" domain that will be used | |
382 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
383 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
384 | * aren't properly represented in the device-tree. | |
385 | */ | |
68700650 | 386 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 387 | { |
54a90588 | 388 | pr_debug("Default domain set to @0x%p\n", domain); |
cc79ca69 | 389 | |
68700650 | 390 | irq_default_domain = domain; |
cc79ca69 | 391 | } |
ecd84eb2 | 392 | EXPORT_SYMBOL_GPL(irq_set_default_host); |
cc79ca69 | 393 | |
913af207 GL |
394 | static void irq_domain_disassociate_many(struct irq_domain *domain, |
395 | unsigned int irq_base, int count) | |
396 | { | |
397 | /* | |
398 | * disassociate in reverse order; | |
399 | * not strictly necessary, but nice for unwinding | |
400 | */ | |
401 | while (count--) { | |
402 | int irq = irq_base + count; | |
403 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
275e31b1 | 404 | irq_hw_number_t hwirq; |
913af207 GL |
405 | |
406 | if (WARN_ON(!irq_data || irq_data->domain != domain)) | |
407 | continue; | |
408 | ||
275e31b1 | 409 | hwirq = irq_data->hwirq; |
913af207 GL |
410 | irq_set_status_flags(irq, IRQ_NOREQUEST); |
411 | ||
412 | /* remove chip and handler */ | |
413 | irq_set_chip_and_handler(irq, NULL, NULL); | |
414 | ||
415 | /* Make sure it's completed */ | |
416 | synchronize_irq(irq); | |
417 | ||
418 | /* Tell the PIC about it */ | |
419 | if (domain->ops->unmap) | |
420 | domain->ops->unmap(domain, irq); | |
421 | smp_mb(); | |
422 | ||
423 | irq_data->domain = NULL; | |
424 | irq_data->hwirq = 0; | |
425 | ||
426 | /* Clear reverse map */ | |
427 | switch(domain->revmap_type) { | |
428 | case IRQ_DOMAIN_MAP_LINEAR: | |
429 | if (hwirq < domain->revmap_data.linear.size) | |
430 | domain->revmap_data.linear.revmap[hwirq] = 0; | |
431 | break; | |
432 | case IRQ_DOMAIN_MAP_TREE: | |
433 | mutex_lock(&revmap_trees_mutex); | |
434 | radix_tree_delete(&domain->revmap_data.tree, hwirq); | |
435 | mutex_unlock(&revmap_trees_mutex); | |
436 | break; | |
437 | } | |
438 | } | |
439 | } | |
440 | ||
98aa468e GL |
441 | int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, |
442 | irq_hw_number_t hwirq_base, int count) | |
cc79ca69 | 443 | { |
98aa468e GL |
444 | unsigned int virq = irq_base; |
445 | irq_hw_number_t hwirq = hwirq_base; | |
f5a1ad05 | 446 | int i, ret; |
cc79ca69 | 447 | |
98aa468e GL |
448 | pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, |
449 | of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count); | |
cc79ca69 | 450 | |
98aa468e GL |
451 | for (i = 0; i < count; i++) { |
452 | struct irq_data *irq_data = irq_get_irq_data(virq + i); | |
453 | ||
454 | if (WARN(!irq_data, "error: irq_desc not allocated; " | |
455 | "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) | |
456 | return -EINVAL; | |
457 | if (WARN(irq_data->domain, "error: irq_desc already associated; " | |
458 | "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) | |
459 | return -EINVAL; | |
460 | }; | |
461 | ||
462 | for (i = 0; i < count; i++, virq++, hwirq++) { | |
463 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
464 | ||
465 | irq_data->hwirq = hwirq; | |
466 | irq_data->domain = domain; | |
f5a1ad05 MB |
467 | if (domain->ops->map) { |
468 | ret = domain->ops->map(domain, virq, hwirq); | |
469 | if (ret != 0) { | |
5fe0c1f2 BH |
470 | /* |
471 | * If map() returns -EPERM, this interrupt is protected | |
472 | * by the firmware or some other service and shall not | |
473 | * be mapped. | |
474 | * | |
475 | * Since on some platforms we blindly try to map everything | |
476 | * we end up with a log full of backtraces. | |
477 | * | |
478 | * So instead, we silently fail on -EPERM, it is the | |
479 | * responsibility of the PIC driver to display a relevant | |
480 | * message if needed. | |
481 | */ | |
482 | if (ret != -EPERM) { | |
483 | pr_err("irq-%i==>hwirq-0x%lx mapping failed: %d\n", | |
484 | virq, hwirq, ret); | |
485 | WARN_ON(1); | |
486 | } | |
f5a1ad05 MB |
487 | irq_data->domain = NULL; |
488 | irq_data->hwirq = 0; | |
489 | goto err_unmap; | |
490 | } | |
98aa468e GL |
491 | } |
492 | ||
493 | switch (domain->revmap_type) { | |
494 | case IRQ_DOMAIN_MAP_LINEAR: | |
495 | if (hwirq < domain->revmap_data.linear.size) | |
496 | domain->revmap_data.linear.revmap[hwirq] = virq; | |
497 | break; | |
498 | case IRQ_DOMAIN_MAP_TREE: | |
499 | mutex_lock(&revmap_trees_mutex); | |
d6b0d1f7 | 500 | radix_tree_insert(&domain->revmap_data.tree, hwirq, irq_data); |
98aa468e GL |
501 | mutex_unlock(&revmap_trees_mutex); |
502 | break; | |
503 | } | |
2a71a1a9 | 504 | |
98aa468e GL |
505 | irq_clear_status_flags(virq, IRQ_NOREQUEST); |
506 | } | |
cc79ca69 GL |
507 | |
508 | return 0; | |
98aa468e GL |
509 | |
510 | err_unmap: | |
511 | irq_domain_disassociate_many(domain, irq_base, i); | |
512 | return -EINVAL; | |
cc79ca69 | 513 | } |
98aa468e | 514 | EXPORT_SYMBOL_GPL(irq_domain_associate_many); |
cc79ca69 GL |
515 | |
516 | /** | |
517 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 518 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
519 | * |
520 | * This routine is used for irq controllers which can choose the hardware | |
521 | * interrupt numbers they generate. In such a case it's simplest to use | |
522 | * the linux irq as the hardware interrupt number. | |
523 | */ | |
68700650 | 524 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
525 | { |
526 | unsigned int virq; | |
527 | ||
68700650 GL |
528 | if (domain == NULL) |
529 | domain = irq_default_domain; | |
cc79ca69 | 530 | |
9844a552 GL |
531 | if (WARN_ON(!domain || domain->revmap_type != IRQ_DOMAIN_MAP_NOMAP)) |
532 | return 0; | |
cc79ca69 | 533 | |
5ca4db61 | 534 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
03848373 | 535 | if (!virq) { |
54a90588 | 536 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 537 | return 0; |
cc79ca69 | 538 | } |
6fa6c8e2 | 539 | if (virq >= domain->revmap_data.nomap.max_irq) { |
cc79ca69 | 540 | pr_err("ERROR: no free irqs available below %i maximum\n", |
6fa6c8e2 | 541 | domain->revmap_data.nomap.max_irq); |
cc79ca69 GL |
542 | irq_free_desc(virq); |
543 | return 0; | |
544 | } | |
54a90588 | 545 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 546 | |
98aa468e | 547 | if (irq_domain_associate(domain, virq, virq)) { |
cc79ca69 | 548 | irq_free_desc(virq); |
03848373 | 549 | return 0; |
cc79ca69 GL |
550 | } |
551 | ||
552 | return virq; | |
553 | } | |
ecd84eb2 | 554 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
555 | |
556 | /** | |
557 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
558 | * @domain: domain owning this hardware interrupt or NULL for default domain |
559 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
560 | * |
561 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
562 | * irq number. | |
563 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
564 | * on the number returned from that call. | |
565 | */ | |
68700650 | 566 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
567 | irq_hw_number_t hwirq) |
568 | { | |
5b7526e3 DD |
569 | unsigned int hint; |
570 | int virq; | |
cc79ca69 | 571 | |
54a90588 | 572 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 573 | |
68700650 GL |
574 | /* Look for default domain if nececssary */ |
575 | if (domain == NULL) | |
576 | domain = irq_default_domain; | |
577 | if (domain == NULL) { | |
54a90588 PM |
578 | pr_warning("irq_create_mapping called for" |
579 | " NULL domain, hwirq=%lx\n", hwirq); | |
cc79ca69 | 580 | WARN_ON(1); |
03848373 | 581 | return 0; |
cc79ca69 | 582 | } |
54a90588 | 583 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
584 | |
585 | /* Check if mapping already exists */ | |
68700650 | 586 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 587 | if (virq) { |
54a90588 | 588 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
589 | return virq; |
590 | } | |
591 | ||
592 | /* Get a virtual interrupt number */ | |
1bc04f2c GL |
593 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
594 | return irq_domain_legacy_revmap(domain, hwirq); | |
595 | ||
596 | /* Allocate a virtual interrupt number */ | |
6fa6c8e2 | 597 | hint = hwirq % nr_irqs; |
1bc04f2c GL |
598 | if (hint == 0) |
599 | hint++; | |
5ca4db61 | 600 | virq = irq_alloc_desc_from(hint, of_node_to_nid(domain->of_node)); |
5b7526e3 | 601 | if (virq <= 0) |
5ca4db61 | 602 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
5b7526e3 | 603 | if (virq <= 0) { |
54a90588 | 604 | pr_debug("-> virq allocation failed\n"); |
1bc04f2c | 605 | return 0; |
cc79ca69 GL |
606 | } |
607 | ||
98aa468e | 608 | if (irq_domain_associate(domain, virq, hwirq)) { |
73255704 | 609 | irq_free_desc(virq); |
03848373 | 610 | return 0; |
cc79ca69 GL |
611 | } |
612 | ||
54a90588 | 613 | pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", |
efd68e72 | 614 | hwirq, of_node_full_name(domain->of_node), virq); |
cc79ca69 GL |
615 | |
616 | return virq; | |
617 | } | |
618 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
619 | ||
98aa468e GL |
620 | /** |
621 | * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs | |
622 | * @domain: domain owning the interrupt range | |
623 | * @irq_base: beginning of linux IRQ range | |
624 | * @hwirq_base: beginning of hardware IRQ range | |
625 | * @count: Number of interrupts to map | |
626 | * | |
627 | * This routine is used for allocating and mapping a range of hardware | |
628 | * irqs to linux irqs where the linux irq numbers are at pre-defined | |
629 | * locations. For use by controllers that already have static mappings | |
630 | * to insert in to the domain. | |
631 | * | |
632 | * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time | |
633 | * domain insertion. | |
634 | * | |
635 | * 0 is returned upon success, while any failure to establish a static | |
636 | * mapping is treated as an error. | |
637 | */ | |
638 | int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, | |
639 | irq_hw_number_t hwirq_base, int count) | |
640 | { | |
641 | int ret; | |
642 | ||
643 | ret = irq_alloc_descs(irq_base, irq_base, count, | |
644 | of_node_to_nid(domain->of_node)); | |
645 | if (unlikely(ret < 0)) | |
646 | return ret; | |
647 | ||
648 | ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count); | |
649 | if (unlikely(ret < 0)) { | |
650 | irq_free_descs(irq_base, count); | |
651 | return ret; | |
652 | } | |
653 | ||
654 | return 0; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(irq_create_strict_mappings); | |
657 | ||
cc79ca69 GL |
658 | unsigned int irq_create_of_mapping(struct device_node *controller, |
659 | const u32 *intspec, unsigned int intsize) | |
660 | { | |
68700650 | 661 | struct irq_domain *domain; |
cc79ca69 GL |
662 | irq_hw_number_t hwirq; |
663 | unsigned int type = IRQ_TYPE_NONE; | |
664 | unsigned int virq; | |
665 | ||
68700650 GL |
666 | domain = controller ? irq_find_host(controller) : irq_default_domain; |
667 | if (!domain) { | |
abd2363f GL |
668 | #ifdef CONFIG_MIPS |
669 | /* | |
670 | * Workaround to avoid breaking interrupt controller drivers | |
671 | * that don't yet register an irq_domain. This is temporary | |
672 | * code. ~~~gcl, Feb 24, 2012 | |
673 | * | |
674 | * Scheduled for removal in Linux v3.6. That should be enough | |
675 | * time. | |
676 | */ | |
677 | if (intsize > 0) | |
678 | return intspec[0]; | |
679 | #endif | |
54a90588 | 680 | pr_warning("no irq domain found for %s !\n", |
efd68e72 | 681 | of_node_full_name(controller)); |
03848373 | 682 | return 0; |
cc79ca69 GL |
683 | } |
684 | ||
68700650 GL |
685 | /* If domain has no translation, then we assume interrupt line */ |
686 | if (domain->ops->xlate == NULL) | |
cc79ca69 GL |
687 | hwirq = intspec[0]; |
688 | else { | |
68700650 | 689 | if (domain->ops->xlate(domain, controller, intspec, intsize, |
cc79ca69 | 690 | &hwirq, &type)) |
03848373 | 691 | return 0; |
cc79ca69 GL |
692 | } |
693 | ||
694 | /* Create mapping */ | |
68700650 | 695 | virq = irq_create_mapping(domain, hwirq); |
03848373 | 696 | if (!virq) |
cc79ca69 GL |
697 | return virq; |
698 | ||
699 | /* Set type if specified and different than the current one */ | |
700 | if (type != IRQ_TYPE_NONE && | |
701 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) | |
702 | irq_set_irq_type(virq, type); | |
703 | return virq; | |
704 | } | |
705 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
706 | ||
707 | /** | |
708 | * irq_dispose_mapping() - Unmap an interrupt | |
709 | * @virq: linux irq number of the interrupt to unmap | |
710 | */ | |
711 | void irq_dispose_mapping(unsigned int virq) | |
712 | { | |
713 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 714 | struct irq_domain *domain; |
cc79ca69 | 715 | |
03848373 | 716 | if (!virq || !irq_data) |
cc79ca69 GL |
717 | return; |
718 | ||
68700650 GL |
719 | domain = irq_data->domain; |
720 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
721 | return; |
722 | ||
723 | /* Never unmap legacy interrupts */ | |
68700650 | 724 | if (domain->revmap_type == IRQ_DOMAIN_MAP_LEGACY) |
cc79ca69 GL |
725 | return; |
726 | ||
913af207 | 727 | irq_domain_disassociate_many(domain, virq, 1); |
cc79ca69 GL |
728 | irq_free_desc(virq); |
729 | } | |
730 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
731 | ||
732 | /** | |
733 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
734 | * @domain: domain owning this hardware interrupt |
735 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 736 | */ |
68700650 | 737 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
738 | irq_hw_number_t hwirq) |
739 | { | |
4c0946c4 | 740 | struct irq_data *data; |
cc79ca69 | 741 | |
68700650 GL |
742 | /* Look for default domain if nececssary */ |
743 | if (domain == NULL) | |
744 | domain = irq_default_domain; | |
745 | if (domain == NULL) | |
03848373 | 746 | return 0; |
cc79ca69 | 747 | |
4c0946c4 GL |
748 | switch (domain->revmap_type) { |
749 | case IRQ_DOMAIN_MAP_LEGACY: | |
1bc04f2c | 750 | return irq_domain_legacy_revmap(domain, hwirq); |
4c0946c4 GL |
751 | case IRQ_DOMAIN_MAP_LINEAR: |
752 | return irq_linear_revmap(domain, hwirq); | |
753 | case IRQ_DOMAIN_MAP_TREE: | |
754 | rcu_read_lock(); | |
755 | data = radix_tree_lookup(&domain->revmap_data.tree, hwirq); | |
756 | rcu_read_unlock(); | |
757 | if (data) | |
758 | return data->irq; | |
759 | break; | |
760 | case IRQ_DOMAIN_MAP_NOMAP: | |
761 | data = irq_get_irq_data(hwirq); | |
68700650 | 762 | if (data && (data->domain == domain) && (data->hwirq == hwirq)) |
4c0946c4 GL |
763 | return hwirq; |
764 | break; | |
765 | } | |
766 | ||
03848373 | 767 | return 0; |
cc79ca69 GL |
768 | } |
769 | EXPORT_SYMBOL_GPL(irq_find_mapping); | |
770 | ||
cc79ca69 GL |
771 | /** |
772 | * irq_linear_revmap() - Find a linux irq from a hw irq number. | |
68700650 GL |
773 | * @domain: domain owning this hardware interrupt |
774 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 775 | * |
4c0946c4 GL |
776 | * This is a fast path that can be called directly by irq controller code to |
777 | * save a handful of instructions. | |
cc79ca69 | 778 | */ |
68700650 | 779 | unsigned int irq_linear_revmap(struct irq_domain *domain, |
cc79ca69 GL |
780 | irq_hw_number_t hwirq) |
781 | { | |
4c0946c4 | 782 | BUG_ON(domain->revmap_type != IRQ_DOMAIN_MAP_LINEAR); |
cc79ca69 | 783 | |
4c0946c4 GL |
784 | /* Check revmap bounds; complain if exceeded */ |
785 | if (WARN_ON(hwirq >= domain->revmap_data.linear.size)) | |
786 | return 0; | |
cc79ca69 | 787 | |
4c0946c4 | 788 | return domain->revmap_data.linear.revmap[hwirq]; |
cc79ca69 | 789 | } |
ecd84eb2 | 790 | EXPORT_SYMBOL_GPL(irq_linear_revmap); |
cc79ca69 | 791 | |
092b2fb0 | 792 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
793 | static int virq_debug_show(struct seq_file *m, void *private) |
794 | { | |
795 | unsigned long flags; | |
796 | struct irq_desc *desc; | |
797 | const char *p; | |
798 | static const char none[] = "none"; | |
799 | void *data; | |
800 | int i; | |
801 | ||
15e06bf6 | 802 | seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq", |
5269a9ab GL |
803 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
804 | "domain name"); | |
cc79ca69 GL |
805 | |
806 | for (i = 1; i < nr_irqs; i++) { | |
807 | desc = irq_to_desc(i); | |
808 | if (!desc) | |
809 | continue; | |
810 | ||
811 | raw_spin_lock_irqsave(&desc->lock, flags); | |
812 | ||
813 | if (desc->action && desc->action->handler) { | |
814 | struct irq_chip *chip; | |
815 | ||
816 | seq_printf(m, "%5d ", i); | |
817 | seq_printf(m, "0x%05lx ", desc->irq_data.hwirq); | |
818 | ||
819 | chip = irq_desc_get_chip(desc); | |
820 | if (chip && chip->name) | |
821 | p = chip->name; | |
822 | else | |
823 | p = none; | |
824 | seq_printf(m, "%-15s ", p); | |
825 | ||
826 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 827 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 828 | |
efd68e72 GL |
829 | if (desc->irq_data.domain) |
830 | p = of_node_full_name(desc->irq_data.domain->of_node); | |
cc79ca69 GL |
831 | else |
832 | p = none; | |
833 | seq_printf(m, "%s\n", p); | |
834 | } | |
835 | ||
836 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
837 | } | |
838 | ||
839 | return 0; | |
840 | } | |
841 | ||
842 | static int virq_debug_open(struct inode *inode, struct file *file) | |
843 | { | |
844 | return single_open(file, virq_debug_show, inode->i_private); | |
845 | } | |
846 | ||
847 | static const struct file_operations virq_debug_fops = { | |
848 | .open = virq_debug_open, | |
849 | .read = seq_read, | |
850 | .llseek = seq_lseek, | |
851 | .release = single_release, | |
852 | }; | |
853 | ||
854 | static int __init irq_debugfs_init(void) | |
855 | { | |
092b2fb0 | 856 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
857 | NULL, &virq_debug_fops) == NULL) |
858 | return -ENOMEM; | |
859 | ||
860 | return 0; | |
861 | } | |
862 | __initcall(irq_debugfs_init); | |
092b2fb0 | 863 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 864 | |
16b2e6e2 GL |
865 | /** |
866 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
867 | * | |
868 | * Device Tree IRQ specifier translation function which works with one cell | |
869 | * bindings where the cell value maps directly to the hwirq number. | |
870 | */ | |
871 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
872 | const u32 *intspec, unsigned int intsize, | |
873 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 874 | { |
16b2e6e2 | 875 | if (WARN_ON(intsize < 1)) |
7e713301 | 876 | return -EINVAL; |
7e713301 GL |
877 | *out_hwirq = intspec[0]; |
878 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
879 | return 0; |
880 | } | |
16b2e6e2 GL |
881 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
882 | ||
883 | /** | |
884 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
885 | * | |
886 | * Device Tree IRQ specifier translation function which works with two cell | |
887 | * bindings where the cell values map directly to the hwirq number | |
888 | * and linux irq flags. | |
889 | */ | |
890 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
891 | const u32 *intspec, unsigned int intsize, | |
892 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
893 | { | |
894 | if (WARN_ON(intsize < 2)) | |
895 | return -EINVAL; | |
896 | *out_hwirq = intspec[0]; | |
897 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
898 | return 0; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
901 | ||
902 | /** | |
903 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
904 | * | |
905 | * Device Tree IRQ specifier translation function which works with either one | |
906 | * or two cell bindings where the cell values map directly to the hwirq number | |
907 | * and linux irq flags. | |
908 | * | |
909 | * Note: don't use this function unless your interrupt controller explicitly | |
910 | * supports both one and two cell bindings. For the majority of controllers | |
911 | * the _onecell() or _twocell() variants above should be used. | |
912 | */ | |
913 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
914 | struct device_node *ctrlr, | |
915 | const u32 *intspec, unsigned int intsize, | |
916 | unsigned long *out_hwirq, unsigned int *out_type) | |
917 | { | |
918 | if (WARN_ON(intsize < 1)) | |
919 | return -EINVAL; | |
920 | *out_hwirq = intspec[0]; | |
921 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
922 | return 0; | |
923 | } | |
924 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 925 | |
a18dc81b | 926 | const struct irq_domain_ops irq_domain_simple_ops = { |
16b2e6e2 | 927 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
928 | }; |
929 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
930 | ||
931 | #ifdef CONFIG_OF_IRQ | |
7e713301 GL |
932 | void irq_domain_generate_simple(const struct of_device_id *match, |
933 | u64 phys_base, unsigned int irq_start) | |
934 | { | |
935 | struct device_node *node; | |
e1964c50 | 936 | pr_debug("looking for phys_base=%llx, irq_start=%i\n", |
7e713301 GL |
937 | (unsigned long long) phys_base, (int) irq_start); |
938 | node = of_find_matching_node_by_address(NULL, match, phys_base); | |
939 | if (node) | |
6b783f7c GL |
940 | irq_domain_add_legacy(node, 32, irq_start, 0, |
941 | &irq_domain_simple_ops, NULL); | |
7e713301 GL |
942 | } |
943 | EXPORT_SYMBOL_GPL(irq_domain_generate_simple); | |
75294957 | 944 | #endif |