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 GL |
18 | |
19 | static LIST_HEAD(irq_domain_list); | |
20 | static DEFINE_MUTEX(irq_domain_mutex); | |
21 | ||
cc79ca69 | 22 | static DEFINE_MUTEX(revmap_trees_mutex); |
68700650 | 23 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 24 | |
cc79ca69 | 25 | /** |
a8db8cf0 | 26 | * irq_domain_alloc() - Allocate a new irq_domain data structure |
cc79ca69 | 27 | * @of_node: optional device-tree node of the interrupt controller |
68700650 | 28 | * @ops: map/unmap domain callbacks |
a8db8cf0 | 29 | * @host_data: Controller private data pointer |
cc79ca69 | 30 | * |
a8db8cf0 GL |
31 | * Allocates and initialize and irq_domain structure. Caller is expected to |
32 | * register allocated irq_domain with irq_domain_register(). Returns pointer | |
33 | * to IRQ domain, or NULL on failure. | |
cc79ca69 | 34 | */ |
a8db8cf0 | 35 | static struct irq_domain *irq_domain_alloc(struct device_node *of_node, |
1aa0dd94 | 36 | int size, |
a18dc81b | 37 | const struct irq_domain_ops *ops, |
a8db8cf0 | 38 | void *host_data) |
cc79ca69 | 39 | { |
a8db8cf0 | 40 | struct irq_domain *domain; |
cc79ca69 | 41 | |
cef5075c GL |
42 | domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size), |
43 | GFP_KERNEL, of_node_to_nid(of_node)); | |
a8db8cf0 | 44 | if (WARN_ON(!domain)) |
cc79ca69 GL |
45 | return NULL; |
46 | ||
47 | /* Fill structure */ | |
1aa0dd94 | 48 | INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL); |
68700650 | 49 | domain->ops = ops; |
a8db8cf0 | 50 | domain->host_data = host_data; |
68700650 | 51 | domain->of_node = of_node_get(of_node); |
1aa0dd94 | 52 | domain->revmap_size = size; |
cc79ca69 | 53 | |
a8db8cf0 GL |
54 | return domain; |
55 | } | |
56 | ||
58ee99ad PM |
57 | static void irq_domain_free(struct irq_domain *domain) |
58 | { | |
59 | of_node_put(domain->of_node); | |
60 | kfree(domain); | |
61 | } | |
62 | ||
a8db8cf0 GL |
63 | static void irq_domain_add(struct irq_domain *domain) |
64 | { | |
65 | mutex_lock(&irq_domain_mutex); | |
66 | list_add(&domain->link, &irq_domain_list); | |
67 | mutex_unlock(&irq_domain_mutex); | |
1aa0dd94 | 68 | pr_debug("Added domain %s\n", domain->name); |
a8db8cf0 GL |
69 | } |
70 | ||
58ee99ad PM |
71 | /** |
72 | * irq_domain_remove() - Remove an irq domain. | |
73 | * @domain: domain to remove | |
74 | * | |
75 | * This routine is used to remove an irq domain. The caller must ensure | |
76 | * that all mappings within the domain have been disposed of prior to | |
77 | * use, depending on the revmap type. | |
78 | */ | |
79 | void irq_domain_remove(struct irq_domain *domain) | |
80 | { | |
81 | mutex_lock(&irq_domain_mutex); | |
82 | ||
cef5075c GL |
83 | /* |
84 | * radix_tree_delete() takes care of destroying the root | |
85 | * node when all entries are removed. Shout if there are | |
86 | * any mappings left. | |
87 | */ | |
1aa0dd94 | 88 | WARN_ON(domain->revmap_tree.height); |
58ee99ad PM |
89 | |
90 | list_del(&domain->link); | |
91 | ||
92 | /* | |
93 | * If the going away domain is the default one, reset it. | |
94 | */ | |
95 | if (unlikely(irq_default_domain == domain)) | |
96 | irq_set_default_host(NULL); | |
97 | ||
98 | mutex_unlock(&irq_domain_mutex); | |
99 | ||
1aa0dd94 | 100 | pr_debug("Removed domain %s\n", domain->name); |
58ee99ad PM |
101 | |
102 | irq_domain_free(domain); | |
103 | } | |
ecd84eb2 | 104 | EXPORT_SYMBOL_GPL(irq_domain_remove); |
58ee99ad | 105 | |
781d0f46 MB |
106 | /** |
107 | * irq_domain_add_simple() - Allocate and register a simple irq_domain. | |
108 | * @of_node: pointer to interrupt controller's device tree node. | |
109 | * @size: total number of irqs in mapping | |
94a63da0 LW |
110 | * @first_irq: first number of irq block assigned to the domain, |
111 | * pass zero to assign irqs on-the-fly. This will result in a | |
112 | * linear IRQ domain so it is important to use irq_create_mapping() | |
113 | * for each used IRQ, especially when SPARSE_IRQ is enabled. | |
781d0f46 MB |
114 | * @ops: map/unmap domain callbacks |
115 | * @host_data: Controller private data pointer | |
116 | * | |
117 | * Allocates a legacy irq_domain if irq_base is positive or a linear | |
2854d167 LW |
118 | * domain otherwise. For the legacy domain, IRQ descriptors will also |
119 | * be allocated. | |
781d0f46 MB |
120 | * |
121 | * This is intended to implement the expected behaviour for most | |
122 | * interrupt controllers which is that a linear mapping should | |
123 | * normally be used unless the system requires a legacy mapping in | |
124 | * order to support supplying interrupt numbers during non-DT | |
125 | * registration of devices. | |
126 | */ | |
127 | struct irq_domain *irq_domain_add_simple(struct device_node *of_node, | |
128 | unsigned int size, | |
129 | unsigned int first_irq, | |
130 | const struct irq_domain_ops *ops, | |
131 | void *host_data) | |
132 | { | |
2854d167 LW |
133 | if (first_irq > 0) { |
134 | int irq_base; | |
135 | ||
136 | if (IS_ENABLED(CONFIG_SPARSE_IRQ)) { | |
137 | /* | |
138 | * Set the descriptor allocator to search for a | |
139 | * 1-to-1 mapping, such as irq_alloc_desc_at(). | |
140 | * Use of_node_to_nid() which is defined to | |
141 | * numa_node_id() on platforms that have no custom | |
142 | * implementation. | |
143 | */ | |
144 | irq_base = irq_alloc_descs(first_irq, first_irq, size, | |
145 | of_node_to_nid(of_node)); | |
146 | if (irq_base < 0) { | |
d202b7b9 LW |
147 | pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", |
148 | first_irq); | |
2854d167 LW |
149 | irq_base = first_irq; |
150 | } | |
151 | } else | |
152 | irq_base = first_irq; | |
153 | ||
154 | return irq_domain_add_legacy(of_node, size, irq_base, 0, | |
781d0f46 | 155 | ops, host_data); |
2854d167 LW |
156 | } |
157 | ||
158 | /* A linear domain is the default */ | |
159 | return irq_domain_add_linear(of_node, size, ops, host_data); | |
781d0f46 | 160 | } |
346dbb79 | 161 | EXPORT_SYMBOL_GPL(irq_domain_add_simple); |
781d0f46 | 162 | |
a8db8cf0 GL |
163 | /** |
164 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
165 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
166 | * @size: total number of irqs in legacy mapping |
167 | * @first_irq: first number of irq block assigned to the domain | |
168 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
169 | * be '0', but a positive integer can be used if the effective | |
170 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
171 | * @ops: map/unmap domain callbacks |
172 | * @host_data: Controller private data pointer | |
173 | * | |
174 | * Note: the map() callback will be called before this function returns | |
175 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
176 | * a legacy controller). | |
177 | */ | |
178 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
179 | unsigned int size, |
180 | unsigned int first_irq, | |
181 | irq_hw_number_t first_hwirq, | |
a18dc81b | 182 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
183 | void *host_data) |
184 | { | |
1bc04f2c | 185 | struct irq_domain *domain; |
a8db8cf0 | 186 | |
9bbf877d GL |
187 | pr_debug("Setting up legacy domain virq[%i:%i] ==> hwirq[%i:%i]\n", |
188 | first_irq, first_irq + size - 1, | |
189 | (int)first_hwirq, (int)first_hwirq + size -1); | |
190 | ||
191 | domain = irq_domain_add_linear(of_node, first_hwirq + size, ops, host_data); | |
a8db8cf0 GL |
192 | if (!domain) |
193 | return NULL; | |
194 | ||
9bbf877d | 195 | WARN_ON(irq_domain_associate_many(domain, first_irq, first_hwirq, size)); |
cc79ca69 | 196 | |
a8db8cf0 GL |
197 | return domain; |
198 | } | |
ecd84eb2 | 199 | EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
a8db8cf0 GL |
200 | |
201 | /** | |
22076c77 | 202 | * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain. |
a8db8cf0 | 203 | * @of_node: pointer to interrupt controller's device tree node. |
a87487e6 | 204 | * @size: Number of interrupts in the domain. |
a8db8cf0 GL |
205 | * @ops: map/unmap domain callbacks |
206 | * @host_data: Controller private data pointer | |
207 | */ | |
208 | struct irq_domain *irq_domain_add_linear(struct device_node *of_node, | |
209 | unsigned int size, | |
a18dc81b | 210 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
211 | void *host_data) |
212 | { | |
213 | struct irq_domain *domain; | |
cc79ca69 | 214 | |
1aa0dd94 | 215 | domain = irq_domain_alloc(of_node, size, ops, host_data); |
cef5075c | 216 | if (!domain) |
a8db8cf0 | 217 | return NULL; |
cc79ca69 | 218 | |
a8db8cf0 GL |
219 | irq_domain_add(domain); |
220 | return domain; | |
221 | } | |
ecd84eb2 | 222 | EXPORT_SYMBOL_GPL(irq_domain_add_linear); |
a8db8cf0 GL |
223 | |
224 | struct irq_domain *irq_domain_add_nomap(struct device_node *of_node, | |
6fa6c8e2 | 225 | unsigned int max_irq, |
a18dc81b | 226 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
227 | void *host_data) |
228 | { | |
1aa0dd94 | 229 | struct irq_domain *domain = irq_domain_alloc(of_node, 0, ops, host_data); |
6fa6c8e2 | 230 | if (domain) { |
1aa0dd94 | 231 | domain->revmap_direct_max_irq = max_irq ? max_irq : ~0; |
a8db8cf0 | 232 | irq_domain_add(domain); |
6fa6c8e2 | 233 | } |
a8db8cf0 GL |
234 | return domain; |
235 | } | |
ecd84eb2 | 236 | EXPORT_SYMBOL_GPL(irq_domain_add_nomap); |
a8db8cf0 | 237 | |
cc79ca69 GL |
238 | /** |
239 | * irq_find_host() - Locates a domain for a given device node | |
240 | * @node: device-tree node of the interrupt controller | |
241 | */ | |
242 | struct irq_domain *irq_find_host(struct device_node *node) | |
243 | { | |
244 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 245 | int rc; |
cc79ca69 GL |
246 | |
247 | /* We might want to match the legacy controller last since | |
248 | * it might potentially be set to match all interrupts in | |
249 | * the absence of a device node. This isn't a problem so far | |
250 | * yet though... | |
251 | */ | |
252 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
253 | list_for_each_entry(h, &irq_domain_list, link) { |
254 | if (h->ops->match) | |
255 | rc = h->ops->match(h, node); | |
256 | else | |
257 | rc = (h->of_node != NULL) && (h->of_node == node); | |
258 | ||
259 | if (rc) { | |
cc79ca69 GL |
260 | found = h; |
261 | break; | |
262 | } | |
a18dc81b | 263 | } |
cc79ca69 GL |
264 | mutex_unlock(&irq_domain_mutex); |
265 | return found; | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(irq_find_host); | |
268 | ||
269 | /** | |
270 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 271 | * @domain: default domain pointer |
cc79ca69 GL |
272 | * |
273 | * For convenience, it's possible to set a "default" domain that will be used | |
274 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
275 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
276 | * aren't properly represented in the device-tree. | |
277 | */ | |
68700650 | 278 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 279 | { |
54a90588 | 280 | pr_debug("Default domain set to @0x%p\n", domain); |
cc79ca69 | 281 | |
68700650 | 282 | irq_default_domain = domain; |
cc79ca69 | 283 | } |
ecd84eb2 | 284 | EXPORT_SYMBOL_GPL(irq_set_default_host); |
cc79ca69 | 285 | |
913af207 GL |
286 | static void irq_domain_disassociate_many(struct irq_domain *domain, |
287 | unsigned int irq_base, int count) | |
288 | { | |
289 | /* | |
290 | * disassociate in reverse order; | |
291 | * not strictly necessary, but nice for unwinding | |
292 | */ | |
293 | while (count--) { | |
294 | int irq = irq_base + count; | |
295 | struct irq_data *irq_data = irq_get_irq_data(irq); | |
275e31b1 | 296 | irq_hw_number_t hwirq; |
913af207 GL |
297 | |
298 | if (WARN_ON(!irq_data || irq_data->domain != domain)) | |
299 | continue; | |
300 | ||
275e31b1 | 301 | hwirq = irq_data->hwirq; |
913af207 GL |
302 | irq_set_status_flags(irq, IRQ_NOREQUEST); |
303 | ||
304 | /* remove chip and handler */ | |
305 | irq_set_chip_and_handler(irq, NULL, NULL); | |
306 | ||
307 | /* Make sure it's completed */ | |
308 | synchronize_irq(irq); | |
309 | ||
310 | /* Tell the PIC about it */ | |
311 | if (domain->ops->unmap) | |
312 | domain->ops->unmap(domain, irq); | |
313 | smp_mb(); | |
314 | ||
315 | irq_data->domain = NULL; | |
316 | irq_data->hwirq = 0; | |
317 | ||
cef5075c | 318 | /* Clear reverse map for this hwirq */ |
1aa0dd94 | 319 | if (hwirq < domain->revmap_size) { |
cef5075c GL |
320 | domain->linear_revmap[hwirq] = 0; |
321 | } else { | |
913af207 | 322 | mutex_lock(&revmap_trees_mutex); |
1aa0dd94 | 323 | radix_tree_delete(&domain->revmap_tree, hwirq); |
913af207 | 324 | mutex_unlock(&revmap_trees_mutex); |
913af207 GL |
325 | } |
326 | } | |
327 | } | |
328 | ||
98aa468e GL |
329 | int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, |
330 | irq_hw_number_t hwirq_base, int count) | |
cc79ca69 | 331 | { |
98aa468e GL |
332 | unsigned int virq = irq_base; |
333 | irq_hw_number_t hwirq = hwirq_base; | |
f5a1ad05 | 334 | int i, ret; |
cc79ca69 | 335 | |
98aa468e GL |
336 | pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, |
337 | of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count); | |
cc79ca69 | 338 | |
98aa468e GL |
339 | for (i = 0; i < count; i++) { |
340 | struct irq_data *irq_data = irq_get_irq_data(virq + i); | |
341 | ||
342 | if (WARN(!irq_data, "error: irq_desc not allocated; " | |
343 | "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) | |
344 | return -EINVAL; | |
345 | if (WARN(irq_data->domain, "error: irq_desc already associated; " | |
346 | "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) | |
347 | return -EINVAL; | |
348 | }; | |
349 | ||
350 | for (i = 0; i < count; i++, virq++, hwirq++) { | |
351 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
352 | ||
353 | irq_data->hwirq = hwirq; | |
354 | irq_data->domain = domain; | |
f5a1ad05 MB |
355 | if (domain->ops->map) { |
356 | ret = domain->ops->map(domain, virq, hwirq); | |
357 | if (ret != 0) { | |
5fe0c1f2 BH |
358 | /* |
359 | * If map() returns -EPERM, this interrupt is protected | |
360 | * by the firmware or some other service and shall not | |
5e1cda5b | 361 | * be mapped. Don't bother telling the user about it. |
5fe0c1f2 BH |
362 | */ |
363 | if (ret != -EPERM) { | |
5e1cda5b | 364 | pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n", |
0bb4afb4 | 365 | domain->name, hwirq, virq, ret); |
5fe0c1f2 | 366 | } |
f5a1ad05 MB |
367 | irq_data->domain = NULL; |
368 | irq_data->hwirq = 0; | |
5e1cda5b | 369 | continue; |
f5a1ad05 | 370 | } |
0bb4afb4 GL |
371 | /* If not already assigned, give the domain the chip's name */ |
372 | if (!domain->name && irq_data->chip) | |
373 | domain->name = irq_data->chip->name; | |
98aa468e GL |
374 | } |
375 | ||
1aa0dd94 | 376 | if (hwirq < domain->revmap_size) { |
cef5075c GL |
377 | domain->linear_revmap[hwirq] = virq; |
378 | } else { | |
98aa468e | 379 | mutex_lock(&revmap_trees_mutex); |
1aa0dd94 | 380 | radix_tree_insert(&domain->revmap_tree, hwirq, irq_data); |
98aa468e | 381 | mutex_unlock(&revmap_trees_mutex); |
98aa468e | 382 | } |
2a71a1a9 | 383 | |
98aa468e GL |
384 | irq_clear_status_flags(virq, IRQ_NOREQUEST); |
385 | } | |
cc79ca69 GL |
386 | |
387 | return 0; | |
388 | } | |
98aa468e | 389 | EXPORT_SYMBOL_GPL(irq_domain_associate_many); |
cc79ca69 GL |
390 | |
391 | /** | |
392 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 393 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
394 | * |
395 | * This routine is used for irq controllers which can choose the hardware | |
396 | * interrupt numbers they generate. In such a case it's simplest to use | |
1aa0dd94 GL |
397 | * the linux irq as the hardware interrupt number. It still uses the linear |
398 | * or radix tree to store the mapping, but the irq controller can optimize | |
399 | * the revmap path by using the hwirq directly. | |
cc79ca69 | 400 | */ |
68700650 | 401 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
402 | { |
403 | unsigned int virq; | |
404 | ||
68700650 GL |
405 | if (domain == NULL) |
406 | domain = irq_default_domain; | |
cc79ca69 | 407 | |
5ca4db61 | 408 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
03848373 | 409 | if (!virq) { |
54a90588 | 410 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 411 | return 0; |
cc79ca69 | 412 | } |
1aa0dd94 | 413 | if (virq >= domain->revmap_direct_max_irq) { |
cc79ca69 | 414 | pr_err("ERROR: no free irqs available below %i maximum\n", |
1aa0dd94 | 415 | domain->revmap_direct_max_irq); |
cc79ca69 GL |
416 | irq_free_desc(virq); |
417 | return 0; | |
418 | } | |
54a90588 | 419 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 420 | |
98aa468e | 421 | if (irq_domain_associate(domain, virq, virq)) { |
cc79ca69 | 422 | irq_free_desc(virq); |
03848373 | 423 | return 0; |
cc79ca69 GL |
424 | } |
425 | ||
426 | return virq; | |
427 | } | |
ecd84eb2 | 428 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
429 | |
430 | /** | |
431 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
432 | * @domain: domain owning this hardware interrupt or NULL for default domain |
433 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
434 | * |
435 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
436 | * irq number. | |
437 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
438 | * on the number returned from that call. | |
439 | */ | |
68700650 | 440 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
441 | irq_hw_number_t hwirq) |
442 | { | |
5b7526e3 DD |
443 | unsigned int hint; |
444 | int virq; | |
cc79ca69 | 445 | |
54a90588 | 446 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 447 | |
68700650 GL |
448 | /* Look for default domain if nececssary */ |
449 | if (domain == NULL) | |
450 | domain = irq_default_domain; | |
451 | if (domain == NULL) { | |
54a90588 PM |
452 | pr_warning("irq_create_mapping called for" |
453 | " NULL domain, hwirq=%lx\n", hwirq); | |
cc79ca69 | 454 | WARN_ON(1); |
03848373 | 455 | return 0; |
cc79ca69 | 456 | } |
54a90588 | 457 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
458 | |
459 | /* Check if mapping already exists */ | |
68700650 | 460 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 461 | if (virq) { |
54a90588 | 462 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
463 | return virq; |
464 | } | |
465 | ||
1bc04f2c | 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 | ||
98aa468e | 478 | if (irq_domain_associate(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 | ||
98aa468e GL |
490 | /** |
491 | * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs | |
492 | * @domain: domain owning the interrupt range | |
493 | * @irq_base: beginning of linux IRQ range | |
494 | * @hwirq_base: beginning of hardware IRQ range | |
495 | * @count: Number of interrupts to map | |
496 | * | |
497 | * This routine is used for allocating and mapping a range of hardware | |
498 | * irqs to linux irqs where the linux irq numbers are at pre-defined | |
499 | * locations. For use by controllers that already have static mappings | |
500 | * to insert in to the domain. | |
501 | * | |
502 | * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time | |
503 | * domain insertion. | |
504 | * | |
505 | * 0 is returned upon success, while any failure to establish a static | |
506 | * mapping is treated as an error. | |
507 | */ | |
508 | int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, | |
509 | irq_hw_number_t hwirq_base, int count) | |
510 | { | |
511 | int ret; | |
512 | ||
513 | ret = irq_alloc_descs(irq_base, irq_base, count, | |
514 | of_node_to_nid(domain->of_node)); | |
515 | if (unlikely(ret < 0)) | |
516 | return ret; | |
517 | ||
518 | ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count); | |
519 | if (unlikely(ret < 0)) { | |
520 | irq_free_descs(irq_base, count); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | return 0; | |
525 | } | |
526 | EXPORT_SYMBOL_GPL(irq_create_strict_mappings); | |
527 | ||
cc79ca69 GL |
528 | unsigned int irq_create_of_mapping(struct device_node *controller, |
529 | const u32 *intspec, unsigned int intsize) | |
530 | { | |
68700650 | 531 | struct irq_domain *domain; |
cc79ca69 GL |
532 | irq_hw_number_t hwirq; |
533 | unsigned int type = IRQ_TYPE_NONE; | |
534 | unsigned int virq; | |
535 | ||
68700650 GL |
536 | domain = controller ? irq_find_host(controller) : irq_default_domain; |
537 | if (!domain) { | |
abd2363f GL |
538 | #ifdef CONFIG_MIPS |
539 | /* | |
540 | * Workaround to avoid breaking interrupt controller drivers | |
541 | * that don't yet register an irq_domain. This is temporary | |
542 | * code. ~~~gcl, Feb 24, 2012 | |
543 | * | |
544 | * Scheduled for removal in Linux v3.6. That should be enough | |
545 | * time. | |
546 | */ | |
547 | if (intsize > 0) | |
548 | return intspec[0]; | |
549 | #endif | |
54a90588 | 550 | pr_warning("no irq domain found for %s !\n", |
efd68e72 | 551 | of_node_full_name(controller)); |
03848373 | 552 | return 0; |
cc79ca69 GL |
553 | } |
554 | ||
68700650 GL |
555 | /* If domain has no translation, then we assume interrupt line */ |
556 | if (domain->ops->xlate == NULL) | |
cc79ca69 GL |
557 | hwirq = intspec[0]; |
558 | else { | |
68700650 | 559 | if (domain->ops->xlate(domain, controller, intspec, intsize, |
cc79ca69 | 560 | &hwirq, &type)) |
03848373 | 561 | return 0; |
cc79ca69 GL |
562 | } |
563 | ||
564 | /* Create mapping */ | |
68700650 | 565 | virq = irq_create_mapping(domain, hwirq); |
03848373 | 566 | if (!virq) |
cc79ca69 GL |
567 | return virq; |
568 | ||
569 | /* Set type if specified and different than the current one */ | |
570 | if (type != IRQ_TYPE_NONE && | |
571 | type != (irqd_get_trigger_type(irq_get_irq_data(virq)))) | |
572 | irq_set_irq_type(virq, type); | |
573 | return virq; | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
576 | ||
577 | /** | |
578 | * irq_dispose_mapping() - Unmap an interrupt | |
579 | * @virq: linux irq number of the interrupt to unmap | |
580 | */ | |
581 | void irq_dispose_mapping(unsigned int virq) | |
582 | { | |
583 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 584 | struct irq_domain *domain; |
cc79ca69 | 585 | |
03848373 | 586 | if (!virq || !irq_data) |
cc79ca69 GL |
587 | return; |
588 | ||
68700650 GL |
589 | domain = irq_data->domain; |
590 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
591 | return; |
592 | ||
913af207 | 593 | irq_domain_disassociate_many(domain, virq, 1); |
cc79ca69 GL |
594 | irq_free_desc(virq); |
595 | } | |
596 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
597 | ||
598 | /** | |
599 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
600 | * @domain: domain owning this hardware interrupt |
601 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 602 | */ |
68700650 | 603 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
604 | irq_hw_number_t hwirq) |
605 | { | |
4c0946c4 | 606 | struct irq_data *data; |
cc79ca69 | 607 | |
68700650 GL |
608 | /* Look for default domain if nececssary */ |
609 | if (domain == NULL) | |
610 | domain = irq_default_domain; | |
611 | if (domain == NULL) | |
03848373 | 612 | return 0; |
cc79ca69 | 613 | |
1aa0dd94 | 614 | if (hwirq < domain->revmap_direct_max_irq) { |
4c0946c4 | 615 | data = irq_get_irq_data(hwirq); |
68700650 | 616 | if (data && (data->domain == domain) && (data->hwirq == hwirq)) |
4c0946c4 | 617 | return hwirq; |
4c0946c4 GL |
618 | } |
619 | ||
1aa0dd94 | 620 | return irq_linear_revmap(domain, hwirq); |
cc79ca69 GL |
621 | } |
622 | EXPORT_SYMBOL_GPL(irq_find_mapping); | |
623 | ||
cc79ca69 GL |
624 | /** |
625 | * irq_linear_revmap() - Find a linux irq from a hw irq number. | |
68700650 GL |
626 | * @domain: domain owning this hardware interrupt |
627 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 628 | * |
4c0946c4 GL |
629 | * This is a fast path that can be called directly by irq controller code to |
630 | * save a handful of instructions. | |
cc79ca69 | 631 | */ |
68700650 | 632 | unsigned int irq_linear_revmap(struct irq_domain *domain, |
cc79ca69 GL |
633 | irq_hw_number_t hwirq) |
634 | { | |
cef5075c | 635 | struct irq_data *data; |
cc79ca69 | 636 | |
4c0946c4 | 637 | /* Check revmap bounds; complain if exceeded */ |
1aa0dd94 | 638 | if (hwirq >= domain->revmap_size) { |
cef5075c | 639 | rcu_read_lock(); |
1aa0dd94 | 640 | data = radix_tree_lookup(&domain->revmap_tree, hwirq); |
cef5075c GL |
641 | rcu_read_unlock(); |
642 | return data ? data->irq : 0; | |
643 | } | |
cc79ca69 | 644 | |
cef5075c | 645 | return domain->linear_revmap[hwirq]; |
cc79ca69 | 646 | } |
ecd84eb2 | 647 | EXPORT_SYMBOL_GPL(irq_linear_revmap); |
cc79ca69 | 648 | |
092b2fb0 | 649 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
650 | static int virq_debug_show(struct seq_file *m, void *private) |
651 | { | |
652 | unsigned long flags; | |
653 | struct irq_desc *desc; | |
cc79ca69 GL |
654 | void *data; |
655 | int i; | |
656 | ||
15e06bf6 | 657 | seq_printf(m, "%-5s %-7s %-15s %-*s %s\n", "irq", "hwirq", |
5269a9ab GL |
658 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
659 | "domain name"); | |
cc79ca69 GL |
660 | |
661 | for (i = 1; i < nr_irqs; i++) { | |
662 | desc = irq_to_desc(i); | |
663 | if (!desc) | |
664 | continue; | |
665 | ||
666 | raw_spin_lock_irqsave(&desc->lock, flags); | |
667 | ||
668 | if (desc->action && desc->action->handler) { | |
669 | struct irq_chip *chip; | |
670 | ||
671 | seq_printf(m, "%5d ", i); | |
672 | seq_printf(m, "0x%05lx ", desc->irq_data.hwirq); | |
673 | ||
674 | chip = irq_desc_get_chip(desc); | |
0bb4afb4 | 675 | seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none"); |
cc79ca69 GL |
676 | |
677 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 678 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 679 | |
0bb4afb4 | 680 | seq_printf(m, "%s\n", desc->irq_data.domain->name); |
cc79ca69 GL |
681 | } |
682 | ||
683 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
684 | } | |
685 | ||
686 | return 0; | |
687 | } | |
688 | ||
689 | static int virq_debug_open(struct inode *inode, struct file *file) | |
690 | { | |
691 | return single_open(file, virq_debug_show, inode->i_private); | |
692 | } | |
693 | ||
694 | static const struct file_operations virq_debug_fops = { | |
695 | .open = virq_debug_open, | |
696 | .read = seq_read, | |
697 | .llseek = seq_lseek, | |
698 | .release = single_release, | |
699 | }; | |
700 | ||
701 | static int __init irq_debugfs_init(void) | |
702 | { | |
092b2fb0 | 703 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
704 | NULL, &virq_debug_fops) == NULL) |
705 | return -ENOMEM; | |
706 | ||
707 | return 0; | |
708 | } | |
709 | __initcall(irq_debugfs_init); | |
092b2fb0 | 710 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 711 | |
16b2e6e2 GL |
712 | /** |
713 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
714 | * | |
715 | * Device Tree IRQ specifier translation function which works with one cell | |
716 | * bindings where the cell value maps directly to the hwirq number. | |
717 | */ | |
718 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
719 | const u32 *intspec, unsigned int intsize, | |
720 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 721 | { |
16b2e6e2 | 722 | if (WARN_ON(intsize < 1)) |
7e713301 | 723 | return -EINVAL; |
7e713301 GL |
724 | *out_hwirq = intspec[0]; |
725 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
726 | return 0; |
727 | } | |
16b2e6e2 GL |
728 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
729 | ||
730 | /** | |
731 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
732 | * | |
733 | * Device Tree IRQ specifier translation function which works with two cell | |
734 | * bindings where the cell values map directly to the hwirq number | |
735 | * and linux irq flags. | |
736 | */ | |
737 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
738 | const u32 *intspec, unsigned int intsize, | |
739 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
740 | { | |
741 | if (WARN_ON(intsize < 2)) | |
742 | return -EINVAL; | |
743 | *out_hwirq = intspec[0]; | |
744 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
745 | return 0; | |
746 | } | |
747 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
748 | ||
749 | /** | |
750 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
751 | * | |
752 | * Device Tree IRQ specifier translation function which works with either one | |
753 | * or two cell bindings where the cell values map directly to the hwirq number | |
754 | * and linux irq flags. | |
755 | * | |
756 | * Note: don't use this function unless your interrupt controller explicitly | |
757 | * supports both one and two cell bindings. For the majority of controllers | |
758 | * the _onecell() or _twocell() variants above should be used. | |
759 | */ | |
760 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
761 | struct device_node *ctrlr, | |
762 | const u32 *intspec, unsigned int intsize, | |
763 | unsigned long *out_hwirq, unsigned int *out_type) | |
764 | { | |
765 | if (WARN_ON(intsize < 1)) | |
766 | return -EINVAL; | |
767 | *out_hwirq = intspec[0]; | |
768 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
769 | return 0; | |
770 | } | |
771 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 772 | |
a18dc81b | 773 | const struct irq_domain_ops irq_domain_simple_ops = { |
16b2e6e2 | 774 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
775 | }; |
776 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
777 | ||
778 | #ifdef CONFIG_OF_IRQ | |
7e713301 GL |
779 | void irq_domain_generate_simple(const struct of_device_id *match, |
780 | u64 phys_base, unsigned int irq_start) | |
781 | { | |
782 | struct device_node *node; | |
e1964c50 | 783 | pr_debug("looking for phys_base=%llx, irq_start=%i\n", |
7e713301 GL |
784 | (unsigned long long) phys_base, (int) irq_start); |
785 | node = of_find_matching_node_by_address(NULL, match, phys_base); | |
786 | if (node) | |
6b783f7c GL |
787 | irq_domain_add_legacy(node, 32, irq_start, 0, |
788 | &irq_domain_simple_ops, NULL); | |
7e713301 GL |
789 | } |
790 | EXPORT_SYMBOL_GPL(irq_domain_generate_simple); | |
75294957 | 791 | #endif |