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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> |
64be38ab | 13 | #include <linux/of_irq.h> |
5ca4db61 | 14 | #include <linux/topology.h> |
cc79ca69 | 15 | #include <linux/seq_file.h> |
7e713301 | 16 | #include <linux/slab.h> |
cc79ca69 GL |
17 | #include <linux/smp.h> |
18 | #include <linux/fs.h> | |
08a543ad GL |
19 | |
20 | static LIST_HEAD(irq_domain_list); | |
21 | static DEFINE_MUTEX(irq_domain_mutex); | |
22 | ||
cc79ca69 | 23 | static DEFINE_MUTEX(revmap_trees_mutex); |
68700650 | 24 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 25 | |
f8264e34 JL |
26 | static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs, |
27 | irq_hw_number_t hwirq, int node); | |
28 | static void irq_domain_check_hierarchy(struct irq_domain *domain); | |
29 | ||
cc79ca69 | 30 | /** |
fa40f377 | 31 | * __irq_domain_add() - Allocate a new irq_domain data structure |
cc79ca69 | 32 | * @of_node: optional device-tree node of the interrupt controller |
fa40f377 | 33 | * @size: Size of linear map; 0 for radix mapping only |
a257954b | 34 | * @hwirq_max: Maximum number of interrupts supported by controller |
fa40f377 GL |
35 | * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no |
36 | * direct mapping | |
f8264e34 | 37 | * @ops: domain callbacks |
a8db8cf0 | 38 | * @host_data: Controller private data pointer |
cc79ca69 | 39 | * |
a257954b JL |
40 | * Allocates and initialize and irq_domain structure. |
41 | * Returns pointer to IRQ domain, or NULL on failure. | |
cc79ca69 | 42 | */ |
ddaf144c GL |
43 | struct irq_domain *__irq_domain_add(struct device_node *of_node, int size, |
44 | irq_hw_number_t hwirq_max, int direct_max, | |
fa40f377 GL |
45 | const struct irq_domain_ops *ops, |
46 | void *host_data) | |
cc79ca69 | 47 | { |
a8db8cf0 | 48 | struct irq_domain *domain; |
cc79ca69 | 49 | |
cef5075c GL |
50 | domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size), |
51 | GFP_KERNEL, of_node_to_nid(of_node)); | |
a8db8cf0 | 52 | if (WARN_ON(!domain)) |
cc79ca69 GL |
53 | return NULL; |
54 | ||
55 | /* Fill structure */ | |
1aa0dd94 | 56 | INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL); |
68700650 | 57 | domain->ops = ops; |
a8db8cf0 | 58 | domain->host_data = host_data; |
68700650 | 59 | domain->of_node = of_node_get(of_node); |
ddaf144c | 60 | domain->hwirq_max = hwirq_max; |
1aa0dd94 | 61 | domain->revmap_size = size; |
fa40f377 | 62 | domain->revmap_direct_max_irq = direct_max; |
f8264e34 | 63 | irq_domain_check_hierarchy(domain); |
cc79ca69 | 64 | |
a8db8cf0 GL |
65 | mutex_lock(&irq_domain_mutex); |
66 | list_add(&domain->link, &irq_domain_list); | |
67 | mutex_unlock(&irq_domain_mutex); | |
fa40f377 | 68 | |
1aa0dd94 | 69 | pr_debug("Added domain %s\n", domain->name); |
fa40f377 | 70 | return domain; |
a8db8cf0 | 71 | } |
fa40f377 | 72 | EXPORT_SYMBOL_GPL(__irq_domain_add); |
a8db8cf0 | 73 | |
58ee99ad PM |
74 | /** |
75 | * irq_domain_remove() - Remove an irq domain. | |
76 | * @domain: domain to remove | |
77 | * | |
78 | * This routine is used to remove an irq domain. The caller must ensure | |
79 | * that all mappings within the domain have been disposed of prior to | |
80 | * use, depending on the revmap type. | |
81 | */ | |
82 | void irq_domain_remove(struct irq_domain *domain) | |
83 | { | |
84 | mutex_lock(&irq_domain_mutex); | |
85 | ||
cef5075c GL |
86 | /* |
87 | * radix_tree_delete() takes care of destroying the root | |
88 | * node when all entries are removed. Shout if there are | |
89 | * any mappings left. | |
90 | */ | |
1aa0dd94 | 91 | WARN_ON(domain->revmap_tree.height); |
58ee99ad PM |
92 | |
93 | list_del(&domain->link); | |
94 | ||
95 | /* | |
96 | * If the going away domain is the default one, reset it. | |
97 | */ | |
98 | if (unlikely(irq_default_domain == domain)) | |
99 | irq_set_default_host(NULL); | |
100 | ||
101 | mutex_unlock(&irq_domain_mutex); | |
102 | ||
1aa0dd94 | 103 | pr_debug("Removed domain %s\n", domain->name); |
58ee99ad | 104 | |
fa40f377 GL |
105 | of_node_put(domain->of_node); |
106 | kfree(domain); | |
58ee99ad | 107 | } |
ecd84eb2 | 108 | EXPORT_SYMBOL_GPL(irq_domain_remove); |
58ee99ad | 109 | |
781d0f46 | 110 | /** |
fa40f377 | 111 | * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs |
781d0f46 MB |
112 | * @of_node: pointer to interrupt controller's device tree node. |
113 | * @size: total number of irqs in mapping | |
94a63da0 | 114 | * @first_irq: first number of irq block assigned to the domain, |
fa40f377 GL |
115 | * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then |
116 | * pre-map all of the irqs in the domain to virqs starting at first_irq. | |
f8264e34 | 117 | * @ops: domain callbacks |
781d0f46 MB |
118 | * @host_data: Controller private data pointer |
119 | * | |
fa40f377 GL |
120 | * Allocates an irq_domain, and optionally if first_irq is positive then also |
121 | * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq. | |
781d0f46 MB |
122 | * |
123 | * This is intended to implement the expected behaviour for most | |
fa40f377 GL |
124 | * interrupt controllers. If device tree is used, then first_irq will be 0 and |
125 | * irqs get mapped dynamically on the fly. However, if the controller requires | |
126 | * static virq assignments (non-DT boot) then it will set that up correctly. | |
781d0f46 MB |
127 | */ |
128 | struct irq_domain *irq_domain_add_simple(struct device_node *of_node, | |
129 | unsigned int size, | |
130 | unsigned int first_irq, | |
131 | const struct irq_domain_ops *ops, | |
132 | void *host_data) | |
133 | { | |
fa40f377 GL |
134 | struct irq_domain *domain; |
135 | ||
ddaf144c | 136 | domain = __irq_domain_add(of_node, size, size, 0, ops, host_data); |
fa40f377 GL |
137 | if (!domain) |
138 | return NULL; | |
2854d167 | 139 | |
fa40f377 | 140 | if (first_irq > 0) { |
2854d167 | 141 | if (IS_ENABLED(CONFIG_SPARSE_IRQ)) { |
fa40f377 GL |
142 | /* attempt to allocated irq_descs */ |
143 | int rc = irq_alloc_descs(first_irq, first_irq, size, | |
144 | of_node_to_nid(of_node)); | |
145 | if (rc < 0) | |
d202b7b9 LW |
146 | pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", |
147 | first_irq); | |
fa40f377 | 148 | } |
ddaf144c | 149 | irq_domain_associate_many(domain, first_irq, 0, size); |
2854d167 LW |
150 | } |
151 | ||
fa40f377 | 152 | return domain; |
781d0f46 | 153 | } |
346dbb79 | 154 | EXPORT_SYMBOL_GPL(irq_domain_add_simple); |
781d0f46 | 155 | |
a8db8cf0 GL |
156 | /** |
157 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
158 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
159 | * @size: total number of irqs in legacy mapping |
160 | * @first_irq: first number of irq block assigned to the domain | |
161 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
162 | * be '0', but a positive integer can be used if the effective | |
163 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
164 | * @ops: map/unmap domain callbacks |
165 | * @host_data: Controller private data pointer | |
166 | * | |
167 | * Note: the map() callback will be called before this function returns | |
168 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
169 | * a legacy controller). | |
170 | */ | |
171 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
172 | unsigned int size, |
173 | unsigned int first_irq, | |
174 | irq_hw_number_t first_hwirq, | |
a18dc81b | 175 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
176 | void *host_data) |
177 | { | |
1bc04f2c | 178 | struct irq_domain *domain; |
a8db8cf0 | 179 | |
ddaf144c GL |
180 | domain = __irq_domain_add(of_node, first_hwirq + size, |
181 | first_hwirq + size, 0, ops, host_data); | |
f8264e34 JL |
182 | if (domain) |
183 | irq_domain_associate_many(domain, first_irq, first_hwirq, size); | |
1bc04f2c | 184 | |
a8db8cf0 GL |
185 | return domain; |
186 | } | |
ecd84eb2 | 187 | EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
a8db8cf0 | 188 | |
cc79ca69 | 189 | /** |
ad3aedfb | 190 | * irq_find_matching_host() - Locates a domain for a given device node |
cc79ca69 | 191 | * @node: device-tree node of the interrupt controller |
ad3aedfb | 192 | * @bus_token: domain-specific data |
cc79ca69 | 193 | */ |
ad3aedfb MZ |
194 | struct irq_domain *irq_find_matching_host(struct device_node *node, |
195 | enum irq_domain_bus_token bus_token) | |
cc79ca69 GL |
196 | { |
197 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 198 | int rc; |
cc79ca69 GL |
199 | |
200 | /* We might want to match the legacy controller last since | |
201 | * it might potentially be set to match all interrupts in | |
202 | * the absence of a device node. This isn't a problem so far | |
203 | * yet though... | |
ad3aedfb MZ |
204 | * |
205 | * bus_token == DOMAIN_BUS_ANY matches any domain, any other | |
206 | * values must generate an exact match for the domain to be | |
207 | * selected. | |
cc79ca69 GL |
208 | */ |
209 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
210 | list_for_each_entry(h, &irq_domain_list, link) { |
211 | if (h->ops->match) | |
ad3aedfb | 212 | rc = h->ops->match(h, node, bus_token); |
a18dc81b | 213 | else |
ad3aedfb MZ |
214 | rc = ((h->of_node != NULL) && (h->of_node == node) && |
215 | ((bus_token == DOMAIN_BUS_ANY) || | |
216 | (h->bus_token == bus_token))); | |
a18dc81b GL |
217 | |
218 | if (rc) { | |
cc79ca69 GL |
219 | found = h; |
220 | break; | |
221 | } | |
a18dc81b | 222 | } |
cc79ca69 GL |
223 | mutex_unlock(&irq_domain_mutex); |
224 | return found; | |
225 | } | |
ad3aedfb | 226 | EXPORT_SYMBOL_GPL(irq_find_matching_host); |
cc79ca69 GL |
227 | |
228 | /** | |
229 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 230 | * @domain: default domain pointer |
cc79ca69 GL |
231 | * |
232 | * For convenience, it's possible to set a "default" domain that will be used | |
233 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
234 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
235 | * aren't properly represented in the device-tree. | |
236 | */ | |
68700650 | 237 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 238 | { |
54a90588 | 239 | pr_debug("Default domain set to @0x%p\n", domain); |
cc79ca69 | 240 | |
68700650 | 241 | irq_default_domain = domain; |
cc79ca69 | 242 | } |
ecd84eb2 | 243 | EXPORT_SYMBOL_GPL(irq_set_default_host); |
cc79ca69 | 244 | |
43a77591 | 245 | void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) |
913af207 | 246 | { |
ddaf144c GL |
247 | struct irq_data *irq_data = irq_get_irq_data(irq); |
248 | irq_hw_number_t hwirq; | |
913af207 | 249 | |
ddaf144c GL |
250 | if (WARN(!irq_data || irq_data->domain != domain, |
251 | "virq%i doesn't exist; cannot disassociate\n", irq)) | |
252 | return; | |
913af207 | 253 | |
ddaf144c GL |
254 | hwirq = irq_data->hwirq; |
255 | irq_set_status_flags(irq, IRQ_NOREQUEST); | |
913af207 | 256 | |
ddaf144c GL |
257 | /* remove chip and handler */ |
258 | irq_set_chip_and_handler(irq, NULL, NULL); | |
913af207 | 259 | |
ddaf144c GL |
260 | /* Make sure it's completed */ |
261 | synchronize_irq(irq); | |
913af207 | 262 | |
ddaf144c GL |
263 | /* Tell the PIC about it */ |
264 | if (domain->ops->unmap) | |
265 | domain->ops->unmap(domain, irq); | |
266 | smp_mb(); | |
913af207 | 267 | |
ddaf144c GL |
268 | irq_data->domain = NULL; |
269 | irq_data->hwirq = 0; | |
913af207 | 270 | |
ddaf144c GL |
271 | /* Clear reverse map for this hwirq */ |
272 | if (hwirq < domain->revmap_size) { | |
273 | domain->linear_revmap[hwirq] = 0; | |
274 | } else { | |
275 | mutex_lock(&revmap_trees_mutex); | |
276 | radix_tree_delete(&domain->revmap_tree, hwirq); | |
277 | mutex_unlock(&revmap_trees_mutex); | |
913af207 GL |
278 | } |
279 | } | |
280 | ||
ddaf144c GL |
281 | int irq_domain_associate(struct irq_domain *domain, unsigned int virq, |
282 | irq_hw_number_t hwirq) | |
cc79ca69 | 283 | { |
ddaf144c GL |
284 | struct irq_data *irq_data = irq_get_irq_data(virq); |
285 | int ret; | |
cc79ca69 | 286 | |
ddaf144c GL |
287 | if (WARN(hwirq >= domain->hwirq_max, |
288 | "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name)) | |
289 | return -EINVAL; | |
290 | if (WARN(!irq_data, "error: virq%i is not allocated", virq)) | |
291 | return -EINVAL; | |
292 | if (WARN(irq_data->domain, "error: virq%i is already associated", virq)) | |
293 | return -EINVAL; | |
cc79ca69 | 294 | |
ddaf144c GL |
295 | mutex_lock(&irq_domain_mutex); |
296 | irq_data->hwirq = hwirq; | |
297 | irq_data->domain = domain; | |
298 | if (domain->ops->map) { | |
299 | ret = domain->ops->map(domain, virq, hwirq); | |
300 | if (ret != 0) { | |
301 | /* | |
302 | * If map() returns -EPERM, this interrupt is protected | |
303 | * by the firmware or some other service and shall not | |
304 | * be mapped. Don't bother telling the user about it. | |
305 | */ | |
306 | if (ret != -EPERM) { | |
307 | pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n", | |
308 | domain->name, hwirq, virq, ret); | |
f5a1ad05 | 309 | } |
ddaf144c GL |
310 | irq_data->domain = NULL; |
311 | irq_data->hwirq = 0; | |
312 | mutex_unlock(&irq_domain_mutex); | |
313 | return ret; | |
98aa468e GL |
314 | } |
315 | ||
ddaf144c GL |
316 | /* If not already assigned, give the domain the chip's name */ |
317 | if (!domain->name && irq_data->chip) | |
318 | domain->name = irq_data->chip->name; | |
319 | } | |
2a71a1a9 | 320 | |
ddaf144c GL |
321 | if (hwirq < domain->revmap_size) { |
322 | domain->linear_revmap[hwirq] = virq; | |
323 | } else { | |
324 | mutex_lock(&revmap_trees_mutex); | |
325 | radix_tree_insert(&domain->revmap_tree, hwirq, irq_data); | |
326 | mutex_unlock(&revmap_trees_mutex); | |
98aa468e | 327 | } |
ddaf144c GL |
328 | mutex_unlock(&irq_domain_mutex); |
329 | ||
330 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
cc79ca69 GL |
331 | |
332 | return 0; | |
333 | } | |
ddaf144c | 334 | EXPORT_SYMBOL_GPL(irq_domain_associate); |
98aa468e | 335 | |
ddaf144c GL |
336 | void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, |
337 | irq_hw_number_t hwirq_base, int count) | |
338 | { | |
339 | int i; | |
340 | ||
341 | pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, | |
342 | of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count); | |
343 | ||
344 | for (i = 0; i < count; i++) { | |
345 | irq_domain_associate(domain, irq_base + i, hwirq_base + i); | |
346 | } | |
cc79ca69 | 347 | } |
98aa468e | 348 | EXPORT_SYMBOL_GPL(irq_domain_associate_many); |
cc79ca69 GL |
349 | |
350 | /** | |
351 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 352 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
353 | * |
354 | * This routine is used for irq controllers which can choose the hardware | |
355 | * interrupt numbers they generate. In such a case it's simplest to use | |
1aa0dd94 GL |
356 | * the linux irq as the hardware interrupt number. It still uses the linear |
357 | * or radix tree to store the mapping, but the irq controller can optimize | |
358 | * the revmap path by using the hwirq directly. | |
cc79ca69 | 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 | |
5ca4db61 | 367 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
03848373 | 368 | if (!virq) { |
54a90588 | 369 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 370 | return 0; |
cc79ca69 | 371 | } |
1aa0dd94 | 372 | if (virq >= domain->revmap_direct_max_irq) { |
cc79ca69 | 373 | pr_err("ERROR: no free irqs available below %i maximum\n", |
1aa0dd94 | 374 | domain->revmap_direct_max_irq); |
cc79ca69 GL |
375 | irq_free_desc(virq); |
376 | return 0; | |
377 | } | |
54a90588 | 378 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 379 | |
98aa468e | 380 | if (irq_domain_associate(domain, virq, virq)) { |
cc79ca69 | 381 | irq_free_desc(virq); |
03848373 | 382 | return 0; |
cc79ca69 GL |
383 | } |
384 | ||
385 | return virq; | |
386 | } | |
ecd84eb2 | 387 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
388 | |
389 | /** | |
390 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
391 | * @domain: domain owning this hardware interrupt or NULL for default domain |
392 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
393 | * |
394 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
395 | * irq number. | |
396 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
397 | * on the number returned from that call. | |
398 | */ | |
68700650 | 399 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
400 | irq_hw_number_t hwirq) |
401 | { | |
5b7526e3 | 402 | int virq; |
cc79ca69 | 403 | |
54a90588 | 404 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 405 | |
68700650 GL |
406 | /* Look for default domain if nececssary */ |
407 | if (domain == NULL) | |
408 | domain = irq_default_domain; | |
409 | if (domain == NULL) { | |
798f0fd1 | 410 | WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq); |
03848373 | 411 | return 0; |
cc79ca69 | 412 | } |
54a90588 | 413 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
414 | |
415 | /* Check if mapping already exists */ | |
68700650 | 416 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 417 | if (virq) { |
54a90588 | 418 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
419 | return virq; |
420 | } | |
421 | ||
1bc04f2c | 422 | /* Allocate a virtual interrupt number */ |
f8264e34 JL |
423 | virq = irq_domain_alloc_descs(-1, 1, hwirq, |
424 | of_node_to_nid(domain->of_node)); | |
5b7526e3 | 425 | if (virq <= 0) { |
54a90588 | 426 | pr_debug("-> virq allocation failed\n"); |
1bc04f2c | 427 | return 0; |
cc79ca69 GL |
428 | } |
429 | ||
98aa468e | 430 | if (irq_domain_associate(domain, virq, hwirq)) { |
73255704 | 431 | irq_free_desc(virq); |
03848373 | 432 | return 0; |
cc79ca69 GL |
433 | } |
434 | ||
54a90588 | 435 | pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", |
efd68e72 | 436 | hwirq, of_node_full_name(domain->of_node), virq); |
cc79ca69 GL |
437 | |
438 | return virq; | |
439 | } | |
440 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
441 | ||
98aa468e GL |
442 | /** |
443 | * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs | |
444 | * @domain: domain owning the interrupt range | |
445 | * @irq_base: beginning of linux IRQ range | |
446 | * @hwirq_base: beginning of hardware IRQ range | |
447 | * @count: Number of interrupts to map | |
448 | * | |
449 | * This routine is used for allocating and mapping a range of hardware | |
450 | * irqs to linux irqs where the linux irq numbers are at pre-defined | |
451 | * locations. For use by controllers that already have static mappings | |
452 | * to insert in to the domain. | |
453 | * | |
454 | * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time | |
455 | * domain insertion. | |
456 | * | |
457 | * 0 is returned upon success, while any failure to establish a static | |
458 | * mapping is treated as an error. | |
459 | */ | |
460 | int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, | |
461 | irq_hw_number_t hwirq_base, int count) | |
462 | { | |
463 | int ret; | |
464 | ||
465 | ret = irq_alloc_descs(irq_base, irq_base, count, | |
466 | of_node_to_nid(domain->of_node)); | |
467 | if (unlikely(ret < 0)) | |
468 | return ret; | |
469 | ||
ddaf144c | 470 | irq_domain_associate_many(domain, irq_base, hwirq_base, count); |
98aa468e GL |
471 | return 0; |
472 | } | |
473 | EXPORT_SYMBOL_GPL(irq_create_strict_mappings); | |
474 | ||
e6d30ab1 | 475 | unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) |
cc79ca69 | 476 | { |
68700650 | 477 | struct irq_domain *domain; |
cc79ca69 GL |
478 | irq_hw_number_t hwirq; |
479 | unsigned int type = IRQ_TYPE_NONE; | |
f8264e34 | 480 | int virq; |
cc79ca69 | 481 | |
e6d30ab1 | 482 | domain = irq_data->np ? irq_find_host(irq_data->np) : irq_default_domain; |
68700650 | 483 | if (!domain) { |
798f0fd1 | 484 | pr_warn("no irq domain found for %s !\n", |
e6d30ab1 | 485 | of_node_full_name(irq_data->np)); |
03848373 | 486 | return 0; |
cc79ca69 GL |
487 | } |
488 | ||
68700650 GL |
489 | /* If domain has no translation, then we assume interrupt line */ |
490 | if (domain->ops->xlate == NULL) | |
e6d30ab1 | 491 | hwirq = irq_data->args[0]; |
cc79ca69 | 492 | else { |
e6d30ab1 GL |
493 | if (domain->ops->xlate(domain, irq_data->np, irq_data->args, |
494 | irq_data->args_count, &hwirq, &type)) | |
03848373 | 495 | return 0; |
cc79ca69 GL |
496 | } |
497 | ||
0cc01aba YC |
498 | if (irq_domain_is_hierarchy(domain)) { |
499 | /* | |
500 | * If we've already configured this interrupt, | |
501 | * don't do it again, or hell will break loose. | |
502 | */ | |
503 | virq = irq_find_mapping(domain, hwirq); | |
504 | if (virq) | |
505 | return virq; | |
506 | ||
507 | virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data); | |
508 | if (virq <= 0) | |
509 | return 0; | |
510 | } else { | |
511 | /* Create mapping */ | |
512 | virq = irq_create_mapping(domain, hwirq); | |
513 | if (!virq) | |
514 | return virq; | |
515 | } | |
cc79ca69 GL |
516 | |
517 | /* Set type if specified and different than the current one */ | |
518 | if (type != IRQ_TYPE_NONE && | |
fbab62c5 | 519 | type != irq_get_trigger_type(virq)) |
cc79ca69 GL |
520 | irq_set_irq_type(virq, type); |
521 | return virq; | |
522 | } | |
523 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
524 | ||
525 | /** | |
526 | * irq_dispose_mapping() - Unmap an interrupt | |
527 | * @virq: linux irq number of the interrupt to unmap | |
528 | */ | |
529 | void irq_dispose_mapping(unsigned int virq) | |
530 | { | |
531 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 532 | struct irq_domain *domain; |
cc79ca69 | 533 | |
03848373 | 534 | if (!virq || !irq_data) |
cc79ca69 GL |
535 | return; |
536 | ||
68700650 GL |
537 | domain = irq_data->domain; |
538 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
539 | return; |
540 | ||
ddaf144c | 541 | irq_domain_disassociate(domain, virq); |
cc79ca69 GL |
542 | irq_free_desc(virq); |
543 | } | |
544 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
545 | ||
546 | /** | |
547 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
548 | * @domain: domain owning this hardware interrupt |
549 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 550 | */ |
68700650 | 551 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
552 | irq_hw_number_t hwirq) |
553 | { | |
4c0946c4 | 554 | struct irq_data *data; |
cc79ca69 | 555 | |
68700650 GL |
556 | /* Look for default domain if nececssary */ |
557 | if (domain == NULL) | |
558 | domain = irq_default_domain; | |
559 | if (domain == NULL) | |
03848373 | 560 | return 0; |
cc79ca69 | 561 | |
1aa0dd94 | 562 | if (hwirq < domain->revmap_direct_max_irq) { |
f8264e34 JL |
563 | data = irq_domain_get_irq_data(domain, hwirq); |
564 | if (data && data->hwirq == hwirq) | |
4c0946c4 | 565 | return hwirq; |
4c0946c4 GL |
566 | } |
567 | ||
d3dcb436 GL |
568 | /* Check if the hwirq is in the linear revmap. */ |
569 | if (hwirq < domain->revmap_size) | |
570 | return domain->linear_revmap[hwirq]; | |
cc79ca69 | 571 | |
d3dcb436 GL |
572 | rcu_read_lock(); |
573 | data = radix_tree_lookup(&domain->revmap_tree, hwirq); | |
574 | rcu_read_unlock(); | |
575 | return data ? data->irq : 0; | |
cc79ca69 | 576 | } |
cc79ca69 | 577 | EXPORT_SYMBOL_GPL(irq_find_mapping); |
cc79ca69 | 578 | |
092b2fb0 | 579 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
580 | static int virq_debug_show(struct seq_file *m, void *private) |
581 | { | |
582 | unsigned long flags; | |
583 | struct irq_desc *desc; | |
1400ea86 GL |
584 | struct irq_domain *domain; |
585 | struct radix_tree_iter iter; | |
586 | void *data, **slot; | |
cc79ca69 GL |
587 | int i; |
588 | ||
1400ea86 GL |
589 | seq_printf(m, " %-16s %-6s %-10s %-10s %s\n", |
590 | "name", "mapped", "linear-max", "direct-max", "devtree-node"); | |
591 | mutex_lock(&irq_domain_mutex); | |
592 | list_for_each_entry(domain, &irq_domain_list, link) { | |
593 | int count = 0; | |
594 | radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0) | |
595 | count++; | |
596 | seq_printf(m, "%c%-16s %6u %10u %10u %s\n", | |
597 | domain == irq_default_domain ? '*' : ' ', domain->name, | |
598 | domain->revmap_size + count, domain->revmap_size, | |
599 | domain->revmap_direct_max_irq, | |
600 | domain->of_node ? of_node_full_name(domain->of_node) : ""); | |
601 | } | |
602 | mutex_unlock(&irq_domain_mutex); | |
603 | ||
604 | seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq", | |
5269a9ab | 605 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
1400ea86 | 606 | "active", "type", "domain"); |
cc79ca69 GL |
607 | |
608 | for (i = 1; i < nr_irqs; i++) { | |
609 | desc = irq_to_desc(i); | |
610 | if (!desc) | |
611 | continue; | |
612 | ||
613 | raw_spin_lock_irqsave(&desc->lock, flags); | |
1400ea86 | 614 | domain = desc->irq_data.domain; |
cc79ca69 | 615 | |
1400ea86 | 616 | if (domain) { |
cc79ca69 | 617 | struct irq_chip *chip; |
1400ea86 GL |
618 | int hwirq = desc->irq_data.hwirq; |
619 | bool direct; | |
cc79ca69 GL |
620 | |
621 | seq_printf(m, "%5d ", i); | |
1400ea86 | 622 | seq_printf(m, "0x%05x ", hwirq); |
cc79ca69 GL |
623 | |
624 | chip = irq_desc_get_chip(desc); | |
0bb4afb4 | 625 | seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none"); |
cc79ca69 GL |
626 | |
627 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 628 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 629 | |
1400ea86 GL |
630 | seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' '); |
631 | direct = (i == hwirq) && (i < domain->revmap_direct_max_irq); | |
632 | seq_printf(m, "%6s%-8s ", | |
633 | (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX", | |
634 | direct ? "(DIRECT)" : ""); | |
0bb4afb4 | 635 | seq_printf(m, "%s\n", desc->irq_data.domain->name); |
cc79ca69 GL |
636 | } |
637 | ||
638 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static int virq_debug_open(struct inode *inode, struct file *file) | |
645 | { | |
646 | return single_open(file, virq_debug_show, inode->i_private); | |
647 | } | |
648 | ||
649 | static const struct file_operations virq_debug_fops = { | |
650 | .open = virq_debug_open, | |
651 | .read = seq_read, | |
652 | .llseek = seq_lseek, | |
653 | .release = single_release, | |
654 | }; | |
655 | ||
656 | static int __init irq_debugfs_init(void) | |
657 | { | |
092b2fb0 | 658 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
659 | NULL, &virq_debug_fops) == NULL) |
660 | return -ENOMEM; | |
661 | ||
662 | return 0; | |
663 | } | |
664 | __initcall(irq_debugfs_init); | |
092b2fb0 | 665 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 666 | |
16b2e6e2 GL |
667 | /** |
668 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
669 | * | |
670 | * Device Tree IRQ specifier translation function which works with one cell | |
671 | * bindings where the cell value maps directly to the hwirq number. | |
672 | */ | |
673 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
674 | const u32 *intspec, unsigned int intsize, | |
675 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 676 | { |
16b2e6e2 | 677 | if (WARN_ON(intsize < 1)) |
7e713301 | 678 | return -EINVAL; |
7e713301 GL |
679 | *out_hwirq = intspec[0]; |
680 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
681 | return 0; |
682 | } | |
16b2e6e2 GL |
683 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
684 | ||
685 | /** | |
686 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
687 | * | |
688 | * Device Tree IRQ specifier translation function which works with two cell | |
689 | * bindings where the cell values map directly to the hwirq number | |
690 | * and linux irq flags. | |
691 | */ | |
692 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
693 | const u32 *intspec, unsigned int intsize, | |
694 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
695 | { | |
696 | if (WARN_ON(intsize < 2)) | |
697 | return -EINVAL; | |
698 | *out_hwirq = intspec[0]; | |
699 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
700 | return 0; | |
701 | } | |
702 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
703 | ||
704 | /** | |
705 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
706 | * | |
707 | * Device Tree IRQ specifier translation function which works with either one | |
708 | * or two cell bindings where the cell values map directly to the hwirq number | |
709 | * and linux irq flags. | |
710 | * | |
711 | * Note: don't use this function unless your interrupt controller explicitly | |
712 | * supports both one and two cell bindings. For the majority of controllers | |
713 | * the _onecell() or _twocell() variants above should be used. | |
714 | */ | |
715 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
716 | struct device_node *ctrlr, | |
717 | const u32 *intspec, unsigned int intsize, | |
718 | unsigned long *out_hwirq, unsigned int *out_type) | |
719 | { | |
720 | if (WARN_ON(intsize < 1)) | |
721 | return -EINVAL; | |
722 | *out_hwirq = intspec[0]; | |
723 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
724 | return 0; | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 727 | |
a18dc81b | 728 | const struct irq_domain_ops irq_domain_simple_ops = { |
16b2e6e2 | 729 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
730 | }; |
731 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
f8264e34 JL |
732 | |
733 | static int irq_domain_alloc_descs(int virq, unsigned int cnt, | |
734 | irq_hw_number_t hwirq, int node) | |
735 | { | |
736 | unsigned int hint; | |
737 | ||
738 | if (virq >= 0) { | |
739 | virq = irq_alloc_descs(virq, virq, cnt, node); | |
740 | } else { | |
741 | hint = hwirq % nr_irqs; | |
742 | if (hint == 0) | |
743 | hint++; | |
744 | virq = irq_alloc_descs_from(hint, cnt, node); | |
745 | if (virq <= 0 && hint > 1) | |
746 | virq = irq_alloc_descs_from(1, cnt, node); | |
747 | } | |
748 | ||
749 | return virq; | |
750 | } | |
751 | ||
752 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY | |
afb7da83 JL |
753 | /** |
754 | * irq_domain_add_hierarchy - Add a irqdomain into the hierarchy | |
755 | * @parent: Parent irq domain to associate with the new domain | |
756 | * @flags: Irq domain flags associated to the domain | |
757 | * @size: Size of the domain. See below | |
758 | * @node: Optional device-tree node of the interrupt controller | |
759 | * @ops: Pointer to the interrupt domain callbacks | |
760 | * @host_data: Controller private data pointer | |
761 | * | |
762 | * If @size is 0 a tree domain is created, otherwise a linear domain. | |
763 | * | |
764 | * If successful the parent is associated to the new domain and the | |
765 | * domain flags are set. | |
766 | * Returns pointer to IRQ domain, or NULL on failure. | |
767 | */ | |
768 | struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent, | |
769 | unsigned int flags, | |
770 | unsigned int size, | |
771 | struct device_node *node, | |
772 | const struct irq_domain_ops *ops, | |
773 | void *host_data) | |
774 | { | |
775 | struct irq_domain *domain; | |
776 | ||
777 | if (size) | |
778 | domain = irq_domain_add_linear(node, size, ops, host_data); | |
779 | else | |
780 | domain = irq_domain_add_tree(node, ops, host_data); | |
781 | if (domain) { | |
782 | domain->parent = parent; | |
783 | domain->flags |= flags; | |
784 | } | |
785 | ||
786 | return domain; | |
787 | } | |
788 | ||
f8264e34 JL |
789 | static void irq_domain_insert_irq(int virq) |
790 | { | |
791 | struct irq_data *data; | |
792 | ||
793 | for (data = irq_get_irq_data(virq); data; data = data->parent_data) { | |
794 | struct irq_domain *domain = data->domain; | |
795 | irq_hw_number_t hwirq = data->hwirq; | |
796 | ||
797 | if (hwirq < domain->revmap_size) { | |
798 | domain->linear_revmap[hwirq] = virq; | |
799 | } else { | |
800 | mutex_lock(&revmap_trees_mutex); | |
801 | radix_tree_insert(&domain->revmap_tree, hwirq, data); | |
802 | mutex_unlock(&revmap_trees_mutex); | |
803 | } | |
804 | ||
805 | /* If not already assigned, give the domain the chip's name */ | |
806 | if (!domain->name && data->chip) | |
807 | domain->name = data->chip->name; | |
808 | } | |
809 | ||
810 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
811 | } | |
812 | ||
813 | static void irq_domain_remove_irq(int virq) | |
814 | { | |
815 | struct irq_data *data; | |
816 | ||
817 | irq_set_status_flags(virq, IRQ_NOREQUEST); | |
818 | irq_set_chip_and_handler(virq, NULL, NULL); | |
819 | synchronize_irq(virq); | |
820 | smp_mb(); | |
821 | ||
822 | for (data = irq_get_irq_data(virq); data; data = data->parent_data) { | |
823 | struct irq_domain *domain = data->domain; | |
824 | irq_hw_number_t hwirq = data->hwirq; | |
825 | ||
826 | if (hwirq < domain->revmap_size) { | |
827 | domain->linear_revmap[hwirq] = 0; | |
828 | } else { | |
829 | mutex_lock(&revmap_trees_mutex); | |
830 | radix_tree_delete(&domain->revmap_tree, hwirq); | |
831 | mutex_unlock(&revmap_trees_mutex); | |
832 | } | |
833 | } | |
834 | } | |
835 | ||
836 | static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain, | |
837 | struct irq_data *child) | |
838 | { | |
839 | struct irq_data *irq_data; | |
840 | ||
6783011b JL |
841 | irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL, |
842 | irq_data_get_node(child)); | |
f8264e34 JL |
843 | if (irq_data) { |
844 | child->parent_data = irq_data; | |
845 | irq_data->irq = child->irq; | |
0d0b4c86 | 846 | irq_data->common = child->common; |
f8264e34 JL |
847 | irq_data->domain = domain; |
848 | } | |
849 | ||
850 | return irq_data; | |
851 | } | |
852 | ||
853 | static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs) | |
854 | { | |
855 | struct irq_data *irq_data, *tmp; | |
856 | int i; | |
857 | ||
858 | for (i = 0; i < nr_irqs; i++) { | |
859 | irq_data = irq_get_irq_data(virq + i); | |
860 | tmp = irq_data->parent_data; | |
861 | irq_data->parent_data = NULL; | |
862 | irq_data->domain = NULL; | |
863 | ||
864 | while (tmp) { | |
865 | irq_data = tmp; | |
866 | tmp = tmp->parent_data; | |
867 | kfree(irq_data); | |
868 | } | |
869 | } | |
870 | } | |
871 | ||
872 | static int irq_domain_alloc_irq_data(struct irq_domain *domain, | |
873 | unsigned int virq, unsigned int nr_irqs) | |
874 | { | |
875 | struct irq_data *irq_data; | |
876 | struct irq_domain *parent; | |
877 | int i; | |
878 | ||
879 | /* The outermost irq_data is embedded in struct irq_desc */ | |
880 | for (i = 0; i < nr_irqs; i++) { | |
881 | irq_data = irq_get_irq_data(virq + i); | |
882 | irq_data->domain = domain; | |
883 | ||
884 | for (parent = domain->parent; parent; parent = parent->parent) { | |
885 | irq_data = irq_domain_insert_irq_data(parent, irq_data); | |
886 | if (!irq_data) { | |
887 | irq_domain_free_irq_data(virq, i + 1); | |
888 | return -ENOMEM; | |
889 | } | |
890 | } | |
891 | } | |
892 | ||
893 | return 0; | |
894 | } | |
895 | ||
896 | /** | |
897 | * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain | |
898 | * @domain: domain to match | |
899 | * @virq: IRQ number to get irq_data | |
900 | */ | |
901 | struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, | |
902 | unsigned int virq) | |
903 | { | |
904 | struct irq_data *irq_data; | |
905 | ||
906 | for (irq_data = irq_get_irq_data(virq); irq_data; | |
907 | irq_data = irq_data->parent_data) | |
908 | if (irq_data->domain == domain) | |
909 | return irq_data; | |
910 | ||
911 | return NULL; | |
912 | } | |
913 | ||
914 | /** | |
915 | * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain | |
916 | * @domain: Interrupt domain to match | |
917 | * @virq: IRQ number | |
918 | * @hwirq: The hwirq number | |
919 | * @chip: The associated interrupt chip | |
920 | * @chip_data: The associated chip data | |
921 | */ | |
922 | int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq, | |
923 | irq_hw_number_t hwirq, struct irq_chip *chip, | |
924 | void *chip_data) | |
925 | { | |
926 | struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq); | |
927 | ||
928 | if (!irq_data) | |
929 | return -ENOENT; | |
930 | ||
931 | irq_data->hwirq = hwirq; | |
932 | irq_data->chip = chip ? chip : &no_irq_chip; | |
933 | irq_data->chip_data = chip_data; | |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
1b537708 JL |
938 | /** |
939 | * irq_domain_set_info - Set the complete data for a @virq in @domain | |
940 | * @domain: Interrupt domain to match | |
941 | * @virq: IRQ number | |
942 | * @hwirq: The hardware interrupt number | |
943 | * @chip: The associated interrupt chip | |
944 | * @chip_data: The associated interrupt chip data | |
945 | * @handler: The interrupt flow handler | |
946 | * @handler_data: The interrupt flow handler data | |
947 | * @handler_name: The interrupt handler name | |
948 | */ | |
949 | void irq_domain_set_info(struct irq_domain *domain, unsigned int virq, | |
950 | irq_hw_number_t hwirq, struct irq_chip *chip, | |
951 | void *chip_data, irq_flow_handler_t handler, | |
952 | void *handler_data, const char *handler_name) | |
953 | { | |
954 | irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data); | |
955 | __irq_set_handler(virq, handler, 0, handler_name); | |
956 | irq_set_handler_data(virq, handler_data); | |
957 | } | |
958 | ||
f8264e34 JL |
959 | /** |
960 | * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data | |
961 | * @irq_data: The pointer to irq_data | |
962 | */ | |
963 | void irq_domain_reset_irq_data(struct irq_data *irq_data) | |
964 | { | |
965 | irq_data->hwirq = 0; | |
966 | irq_data->chip = &no_irq_chip; | |
967 | irq_data->chip_data = NULL; | |
968 | } | |
969 | ||
970 | /** | |
971 | * irq_domain_free_irqs_common - Clear irq_data and free the parent | |
972 | * @domain: Interrupt domain to match | |
973 | * @virq: IRQ number to start with | |
974 | * @nr_irqs: The number of irqs to free | |
975 | */ | |
976 | void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq, | |
977 | unsigned int nr_irqs) | |
978 | { | |
979 | struct irq_data *irq_data; | |
980 | int i; | |
981 | ||
982 | for (i = 0; i < nr_irqs; i++) { | |
983 | irq_data = irq_domain_get_irq_data(domain, virq + i); | |
984 | if (irq_data) | |
985 | irq_domain_reset_irq_data(irq_data); | |
986 | } | |
987 | irq_domain_free_irqs_parent(domain, virq, nr_irqs); | |
988 | } | |
989 | ||
990 | /** | |
991 | * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent | |
992 | * @domain: Interrupt domain to match | |
993 | * @virq: IRQ number to start with | |
994 | * @nr_irqs: The number of irqs to free | |
995 | */ | |
996 | void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq, | |
997 | unsigned int nr_irqs) | |
998 | { | |
999 | int i; | |
1000 | ||
1001 | for (i = 0; i < nr_irqs; i++) { | |
1002 | irq_set_handler_data(virq + i, NULL); | |
1003 | irq_set_handler(virq + i, NULL); | |
1004 | } | |
1005 | irq_domain_free_irqs_common(domain, virq, nr_irqs); | |
1006 | } | |
1007 | ||
36d72731 JL |
1008 | static bool irq_domain_is_auto_recursive(struct irq_domain *domain) |
1009 | { | |
1010 | return domain->flags & IRQ_DOMAIN_FLAG_AUTO_RECURSIVE; | |
1011 | } | |
1012 | ||
1013 | static void irq_domain_free_irqs_recursive(struct irq_domain *domain, | |
1014 | unsigned int irq_base, | |
1015 | unsigned int nr_irqs) | |
1016 | { | |
1017 | domain->ops->free(domain, irq_base, nr_irqs); | |
1018 | if (irq_domain_is_auto_recursive(domain)) { | |
1019 | BUG_ON(!domain->parent); | |
1020 | irq_domain_free_irqs_recursive(domain->parent, irq_base, | |
1021 | nr_irqs); | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | static int irq_domain_alloc_irqs_recursive(struct irq_domain *domain, | |
1026 | unsigned int irq_base, | |
1027 | unsigned int nr_irqs, void *arg) | |
1028 | { | |
1029 | int ret = 0; | |
1030 | struct irq_domain *parent = domain->parent; | |
1031 | bool recursive = irq_domain_is_auto_recursive(domain); | |
1032 | ||
1033 | BUG_ON(recursive && !parent); | |
1034 | if (recursive) | |
1035 | ret = irq_domain_alloc_irqs_recursive(parent, irq_base, | |
1036 | nr_irqs, arg); | |
1037 | if (ret >= 0) | |
1038 | ret = domain->ops->alloc(domain, irq_base, nr_irqs, arg); | |
1039 | if (ret < 0 && recursive) | |
1040 | irq_domain_free_irqs_recursive(parent, irq_base, nr_irqs); | |
1041 | ||
1042 | return ret; | |
1043 | } | |
1044 | ||
f8264e34 JL |
1045 | /** |
1046 | * __irq_domain_alloc_irqs - Allocate IRQs from domain | |
1047 | * @domain: domain to allocate from | |
1048 | * @irq_base: allocate specified IRQ nubmer if irq_base >= 0 | |
1049 | * @nr_irqs: number of IRQs to allocate | |
1050 | * @node: NUMA node id for memory allocation | |
1051 | * @arg: domain specific argument | |
1052 | * @realloc: IRQ descriptors have already been allocated if true | |
1053 | * | |
1054 | * Allocate IRQ numbers and initialized all data structures to support | |
1055 | * hierarchy IRQ domains. | |
1056 | * Parameter @realloc is mainly to support legacy IRQs. | |
1057 | * Returns error code or allocated IRQ number | |
1058 | * | |
1059 | * The whole process to setup an IRQ has been split into two steps. | |
1060 | * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ | |
1061 | * descriptor and required hardware resources. The second step, | |
1062 | * irq_domain_activate_irq(), is to program hardwares with preallocated | |
1063 | * resources. In this way, it's easier to rollback when failing to | |
1064 | * allocate resources. | |
1065 | */ | |
1066 | int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, | |
1067 | unsigned int nr_irqs, int node, void *arg, | |
1068 | bool realloc) | |
1069 | { | |
1070 | int i, ret, virq; | |
1071 | ||
1072 | if (domain == NULL) { | |
1073 | domain = irq_default_domain; | |
1074 | if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n")) | |
1075 | return -EINVAL; | |
1076 | } | |
1077 | ||
1078 | if (!domain->ops->alloc) { | |
1079 | pr_debug("domain->ops->alloc() is NULL\n"); | |
1080 | return -ENOSYS; | |
1081 | } | |
1082 | ||
1083 | if (realloc && irq_base >= 0) { | |
1084 | virq = irq_base; | |
1085 | } else { | |
1086 | virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node); | |
1087 | if (virq < 0) { | |
1088 | pr_debug("cannot allocate IRQ(base %d, count %d)\n", | |
1089 | irq_base, nr_irqs); | |
1090 | return virq; | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) { | |
1095 | pr_debug("cannot allocate memory for IRQ%d\n", virq); | |
1096 | ret = -ENOMEM; | |
1097 | goto out_free_desc; | |
1098 | } | |
1099 | ||
1100 | mutex_lock(&irq_domain_mutex); | |
36d72731 | 1101 | ret = irq_domain_alloc_irqs_recursive(domain, virq, nr_irqs, arg); |
f8264e34 JL |
1102 | if (ret < 0) { |
1103 | mutex_unlock(&irq_domain_mutex); | |
1104 | goto out_free_irq_data; | |
1105 | } | |
1106 | for (i = 0; i < nr_irqs; i++) | |
1107 | irq_domain_insert_irq(virq + i); | |
1108 | mutex_unlock(&irq_domain_mutex); | |
1109 | ||
1110 | return virq; | |
1111 | ||
1112 | out_free_irq_data: | |
1113 | irq_domain_free_irq_data(virq, nr_irqs); | |
1114 | out_free_desc: | |
1115 | irq_free_descs(virq, nr_irqs); | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | /** | |
1120 | * irq_domain_free_irqs - Free IRQ number and associated data structures | |
1121 | * @virq: base IRQ number | |
1122 | * @nr_irqs: number of IRQs to free | |
1123 | */ | |
1124 | void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs) | |
1125 | { | |
1126 | struct irq_data *data = irq_get_irq_data(virq); | |
1127 | int i; | |
1128 | ||
1129 | if (WARN(!data || !data->domain || !data->domain->ops->free, | |
1130 | "NULL pointer, cannot free irq\n")) | |
1131 | return; | |
1132 | ||
1133 | mutex_lock(&irq_domain_mutex); | |
1134 | for (i = 0; i < nr_irqs; i++) | |
1135 | irq_domain_remove_irq(virq + i); | |
36d72731 | 1136 | irq_domain_free_irqs_recursive(data->domain, virq, nr_irqs); |
f8264e34 JL |
1137 | mutex_unlock(&irq_domain_mutex); |
1138 | ||
1139 | irq_domain_free_irq_data(virq, nr_irqs); | |
1140 | irq_free_descs(virq, nr_irqs); | |
1141 | } | |
1142 | ||
36d72731 JL |
1143 | /** |
1144 | * irq_domain_alloc_irqs_parent - Allocate interrupts from parent domain | |
1145 | * @irq_base: Base IRQ number | |
1146 | * @nr_irqs: Number of IRQs to allocate | |
1147 | * @arg: Allocation data (arch/domain specific) | |
1148 | * | |
1149 | * Check whether the domain has been setup recursive. If not allocate | |
1150 | * through the parent domain. | |
1151 | */ | |
1152 | int irq_domain_alloc_irqs_parent(struct irq_domain *domain, | |
1153 | unsigned int irq_base, unsigned int nr_irqs, | |
1154 | void *arg) | |
1155 | { | |
1156 | /* irq_domain_alloc_irqs_recursive() has called parent's alloc() */ | |
1157 | if (irq_domain_is_auto_recursive(domain)) | |
1158 | return 0; | |
1159 | ||
1160 | domain = domain->parent; | |
1161 | if (domain) | |
1162 | return irq_domain_alloc_irqs_recursive(domain, irq_base, | |
1163 | nr_irqs, arg); | |
1164 | return -ENOSYS; | |
1165 | } | |
1166 | ||
1167 | /** | |
1168 | * irq_domain_free_irqs_parent - Free interrupts from parent domain | |
1169 | * @irq_base: Base IRQ number | |
1170 | * @nr_irqs: Number of IRQs to free | |
1171 | * | |
1172 | * Check whether the domain has been setup recursive. If not free | |
1173 | * through the parent domain. | |
1174 | */ | |
1175 | void irq_domain_free_irqs_parent(struct irq_domain *domain, | |
1176 | unsigned int irq_base, unsigned int nr_irqs) | |
1177 | { | |
1178 | /* irq_domain_free_irqs_recursive() will call parent's free */ | |
1179 | if (!irq_domain_is_auto_recursive(domain) && domain->parent) | |
1180 | irq_domain_free_irqs_recursive(domain->parent, irq_base, | |
1181 | nr_irqs); | |
1182 | } | |
1183 | ||
f8264e34 JL |
1184 | /** |
1185 | * irq_domain_activate_irq - Call domain_ops->activate recursively to activate | |
1186 | * interrupt | |
1187 | * @irq_data: outermost irq_data associated with interrupt | |
1188 | * | |
1189 | * This is the second step to call domain_ops->activate to program interrupt | |
1190 | * controllers, so the interrupt could actually get delivered. | |
1191 | */ | |
1192 | void irq_domain_activate_irq(struct irq_data *irq_data) | |
1193 | { | |
1194 | if (irq_data && irq_data->domain) { | |
1195 | struct irq_domain *domain = irq_data->domain; | |
1196 | ||
1197 | if (irq_data->parent_data) | |
1198 | irq_domain_activate_irq(irq_data->parent_data); | |
1199 | if (domain->ops->activate) | |
1200 | domain->ops->activate(domain, irq_data); | |
1201 | } | |
1202 | } | |
1203 | ||
1204 | /** | |
1205 | * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to | |
1206 | * deactivate interrupt | |
1207 | * @irq_data: outermost irq_data associated with interrupt | |
1208 | * | |
1209 | * It calls domain_ops->deactivate to program interrupt controllers to disable | |
1210 | * interrupt delivery. | |
1211 | */ | |
1212 | void irq_domain_deactivate_irq(struct irq_data *irq_data) | |
1213 | { | |
1214 | if (irq_data && irq_data->domain) { | |
1215 | struct irq_domain *domain = irq_data->domain; | |
1216 | ||
1217 | if (domain->ops->deactivate) | |
1218 | domain->ops->deactivate(domain, irq_data); | |
1219 | if (irq_data->parent_data) | |
1220 | irq_domain_deactivate_irq(irq_data->parent_data); | |
1221 | } | |
1222 | } | |
1223 | ||
1224 | static void irq_domain_check_hierarchy(struct irq_domain *domain) | |
1225 | { | |
1226 | /* Hierarchy irq_domains must implement callback alloc() */ | |
1227 | if (domain->ops->alloc) | |
1228 | domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY; | |
1229 | } | |
1230 | #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ | |
1231 | /** | |
1232 | * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain | |
1233 | * @domain: domain to match | |
1234 | * @virq: IRQ number to get irq_data | |
1235 | */ | |
1236 | struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, | |
1237 | unsigned int virq) | |
1238 | { | |
1239 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
1240 | ||
1241 | return (irq_data && irq_data->domain == domain) ? irq_data : NULL; | |
1242 | } | |
1243 | ||
5f22f5c6 SA |
1244 | /** |
1245 | * irq_domain_set_info - Set the complete data for a @virq in @domain | |
1246 | * @domain: Interrupt domain to match | |
1247 | * @virq: IRQ number | |
1248 | * @hwirq: The hardware interrupt number | |
1249 | * @chip: The associated interrupt chip | |
1250 | * @chip_data: The associated interrupt chip data | |
1251 | * @handler: The interrupt flow handler | |
1252 | * @handler_data: The interrupt flow handler data | |
1253 | * @handler_name: The interrupt handler name | |
1254 | */ | |
1255 | void irq_domain_set_info(struct irq_domain *domain, unsigned int virq, | |
1256 | irq_hw_number_t hwirq, struct irq_chip *chip, | |
1257 | void *chip_data, irq_flow_handler_t handler, | |
1258 | void *handler_data, const char *handler_name) | |
1259 | { | |
1260 | irq_set_chip_and_handler_name(virq, chip, handler, handler_name); | |
1261 | irq_set_chip_data(virq, chip_data); | |
1262 | irq_set_handler_data(virq, handler_data); | |
1263 | } | |
1264 | ||
f8264e34 JL |
1265 | static void irq_domain_check_hierarchy(struct irq_domain *domain) |
1266 | { | |
1267 | } | |
1268 | #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ |