Commit | Line | Data |
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e3873444 GL |
1 | /* |
2 | * Derived from arch/i386/kernel/irq.c | |
3 | * Copyright (C) 1992 Linus Torvalds | |
4 | * Adapted from arch/i386 by Gary Thomas | |
5 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
6 | * Updated and modified by Cort Dougan <cort@fsmlabs.com> | |
7 | * Copyright (C) 1996-2001 Cort Dougan | |
8 | * Adapted for Power Macintosh by Paul Mackerras | |
9 | * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * This file contains the code used to make IRQ descriptions in the | |
17 | * device tree to actual irq numbers on an interrupt controller | |
18 | * driver. | |
19 | */ | |
20 | ||
c706c239 | 21 | #include <linux/device.h> |
e3873444 | 22 | #include <linux/errno.h> |
c71a54b0 | 23 | #include <linux/list.h> |
e3873444 GL |
24 | #include <linux/module.h> |
25 | #include <linux/of.h> | |
26 | #include <linux/of_irq.h> | |
27 | #include <linux/string.h> | |
c71a54b0 | 28 | #include <linux/slab.h> |
e3873444 GL |
29 | |
30 | /** | |
31 | * irq_of_parse_and_map - Parse and map an interrupt into linux virq space | |
d84ff46a | 32 | * @dev: Device node of the device whose interrupt is to be mapped |
e3873444 GL |
33 | * @index: Index of the interrupt to map |
34 | * | |
0c02c800 | 35 | * This function is a wrapper that chains of_irq_parse_one() and |
e3873444 GL |
36 | * irq_create_of_mapping() to make things easier to callers |
37 | */ | |
38 | unsigned int irq_of_parse_and_map(struct device_node *dev, int index) | |
39 | { | |
530210c7 | 40 | struct of_phandle_args oirq; |
e3873444 | 41 | |
0c02c800 | 42 | if (of_irq_parse_one(dev, index, &oirq)) |
77a7300a | 43 | return 0; |
e3873444 | 44 | |
e6d30ab1 | 45 | return irq_create_of_mapping(&oirq); |
e3873444 GL |
46 | } |
47 | EXPORT_SYMBOL_GPL(irq_of_parse_and_map); | |
7dc2e113 GL |
48 | |
49 | /** | |
50 | * of_irq_find_parent - Given a device node, find its interrupt parent node | |
51 | * @child: pointer to device node | |
52 | * | |
53 | * Returns a pointer to the interrupt parent node, or NULL if the interrupt | |
54 | * parent could not be determined. | |
55 | */ | |
0b2e9a8e | 56 | struct device_node *of_irq_find_parent(struct device_node *child) |
7dc2e113 | 57 | { |
b4bbb029 | 58 | struct device_node *p; |
9a6b2e58 | 59 | const __be32 *parp; |
7dc2e113 | 60 | |
b4bbb029 | 61 | if (!of_node_get(child)) |
7dc2e113 GL |
62 | return NULL; |
63 | ||
64 | do { | |
b4bbb029 | 65 | parp = of_get_property(child, "interrupt-parent", NULL); |
7dc2e113 | 66 | if (parp == NULL) |
b4bbb029 | 67 | p = of_get_parent(child); |
7dc2e113 GL |
68 | else { |
69 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
70 | p = of_node_get(of_irq_dflt_pic); | |
71 | else | |
9a6b2e58 | 72 | p = of_find_node_by_phandle(be32_to_cpup(parp)); |
7dc2e113 | 73 | } |
b4bbb029 LT |
74 | of_node_put(child); |
75 | child = p; | |
7dc2e113 GL |
76 | } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL); |
77 | ||
b4bbb029 | 78 | return p; |
7dc2e113 GL |
79 | } |
80 | ||
81 | /** | |
0c02c800 | 82 | * of_irq_parse_raw - Low level interrupt tree parsing |
7dc2e113 | 83 | * @parent: the device interrupt parent |
23616132 GL |
84 | * @addr: address specifier (start of "reg" property of the device) in be32 format |
85 | * @out_irq: structure of_irq updated by this function | |
7dc2e113 GL |
86 | * |
87 | * Returns 0 on success and a negative number on error | |
88 | * | |
89 | * This function is a low-level interrupt tree walking function. It | |
90 | * can be used to do a partial walk with synthetized reg and interrupts | |
91 | * properties, for example when resolving PCI interrupts when no device | |
23616132 GL |
92 | * node exist for the parent. It takes an interrupt specifier structure as |
93 | * input, walks the tree looking for any interrupt-map properties, translates | |
94 | * the specifier for each map, and then returns the translated map. | |
7dc2e113 | 95 | */ |
23616132 | 96 | int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) |
7dc2e113 GL |
97 | { |
98 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; | |
355e62f5 | 99 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; |
23616132 | 100 | const __be32 *match_array = initial_match_array; |
355e62f5 | 101 | const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 }; |
7dc2e113 GL |
102 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
103 | int imaplen, match, i; | |
104 | ||
624cfca5 GL |
105 | #ifdef DEBUG |
106 | of_print_phandle_args("of_irq_parse_raw: ", out_irq); | |
107 | #endif | |
7dc2e113 | 108 | |
23616132 | 109 | ipar = of_node_get(out_irq->np); |
7dc2e113 GL |
110 | |
111 | /* First get the #interrupt-cells property of the current cursor | |
112 | * that tells us how to interpret the passed-in intspec. If there | |
113 | * is none, we are nice and just walk up the tree | |
114 | */ | |
115 | do { | |
116 | tmp = of_get_property(ipar, "#interrupt-cells", NULL); | |
117 | if (tmp != NULL) { | |
a7c194b0 | 118 | intsize = be32_to_cpu(*tmp); |
7dc2e113 GL |
119 | break; |
120 | } | |
121 | tnode = ipar; | |
122 | ipar = of_irq_find_parent(ipar); | |
123 | of_node_put(tnode); | |
124 | } while (ipar); | |
125 | if (ipar == NULL) { | |
126 | pr_debug(" -> no parent found !\n"); | |
127 | goto fail; | |
128 | } | |
129 | ||
0c02c800 | 130 | pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize); |
7dc2e113 | 131 | |
23616132 | 132 | if (out_irq->args_count != intsize) |
7dc2e113 GL |
133 | return -EINVAL; |
134 | ||
135 | /* Look for this #address-cells. We have to implement the old linux | |
136 | * trick of looking for the parent here as some device-trees rely on it | |
137 | */ | |
138 | old = of_node_get(ipar); | |
139 | do { | |
140 | tmp = of_get_property(old, "#address-cells", NULL); | |
141 | tnode = of_get_parent(old); | |
142 | of_node_put(old); | |
143 | old = tnode; | |
144 | } while (old && tmp == NULL); | |
145 | of_node_put(old); | |
146 | old = NULL; | |
a7c194b0 | 147 | addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); |
7dc2e113 GL |
148 | |
149 | pr_debug(" -> addrsize=%d\n", addrsize); | |
150 | ||
355e62f5 GL |
151 | /* Range check so that the temporary buffer doesn't overflow */ |
152 | if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) | |
153 | goto fail; | |
154 | ||
23616132 GL |
155 | /* Precalculate the match array - this simplifies match loop */ |
156 | for (i = 0; i < addrsize; i++) | |
78119fd1 | 157 | initial_match_array[i] = addr ? addr[i] : 0; |
23616132 GL |
158 | for (i = 0; i < intsize; i++) |
159 | initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); | |
160 | ||
7dc2e113 GL |
161 | /* Now start the actual "proper" walk of the interrupt tree */ |
162 | while (ipar != NULL) { | |
163 | /* Now check if cursor is an interrupt-controller and if it is | |
164 | * then we are done | |
165 | */ | |
166 | if (of_get_property(ipar, "interrupt-controller", NULL) != | |
167 | NULL) { | |
168 | pr_debug(" -> got it !\n"); | |
7dc2e113 GL |
169 | return 0; |
170 | } | |
171 | ||
78119fd1 GL |
172 | /* |
173 | * interrupt-map parsing does not work without a reg | |
174 | * property when #address-cells != 0 | |
175 | */ | |
176 | if (addrsize && !addr) { | |
177 | pr_debug(" -> no reg passed in when needed !\n"); | |
178 | goto fail; | |
179 | } | |
180 | ||
7dc2e113 GL |
181 | /* Now look for an interrupt-map */ |
182 | imap = of_get_property(ipar, "interrupt-map", &imaplen); | |
183 | /* No interrupt map, check for an interrupt parent */ | |
184 | if (imap == NULL) { | |
185 | pr_debug(" -> no map, getting parent\n"); | |
186 | newpar = of_irq_find_parent(ipar); | |
187 | goto skiplevel; | |
188 | } | |
189 | imaplen /= sizeof(u32); | |
190 | ||
191 | /* Look for a mask */ | |
192 | imask = of_get_property(ipar, "interrupt-map-mask", NULL); | |
23616132 GL |
193 | if (!imask) |
194 | imask = dummy_imask; | |
7dc2e113 GL |
195 | |
196 | /* Parse interrupt-map */ | |
197 | match = 0; | |
198 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
199 | /* Compare specifiers */ | |
200 | match = 1; | |
23616132 | 201 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
74dac2ed | 202 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
7dc2e113 GL |
203 | |
204 | pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
205 | ||
206 | /* Get the interrupt parent */ | |
207 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
208 | newpar = of_node_get(of_irq_dflt_pic); | |
209 | else | |
9a6b2e58 | 210 | newpar = of_find_node_by_phandle(be32_to_cpup(imap)); |
7dc2e113 GL |
211 | imap++; |
212 | --imaplen; | |
213 | ||
214 | /* Check if not found */ | |
215 | if (newpar == NULL) { | |
216 | pr_debug(" -> imap parent not found !\n"); | |
217 | goto fail; | |
218 | } | |
219 | ||
1ca56e7d PC |
220 | if (!of_device_is_available(newpar)) |
221 | match = 0; | |
222 | ||
7dc2e113 GL |
223 | /* Get #interrupt-cells and #address-cells of new |
224 | * parent | |
225 | */ | |
226 | tmp = of_get_property(newpar, "#interrupt-cells", NULL); | |
227 | if (tmp == NULL) { | |
228 | pr_debug(" -> parent lacks #interrupt-cells!\n"); | |
229 | goto fail; | |
230 | } | |
a7c194b0 | 231 | newintsize = be32_to_cpu(*tmp); |
7dc2e113 | 232 | tmp = of_get_property(newpar, "#address-cells", NULL); |
a7c194b0 | 233 | newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp); |
7dc2e113 GL |
234 | |
235 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n", | |
236 | newintsize, newaddrsize); | |
237 | ||
238 | /* Check for malformed properties */ | |
355e62f5 GL |
239 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS)) |
240 | goto fail; | |
7dc2e113 GL |
241 | if (imaplen < (newaddrsize + newintsize)) |
242 | goto fail; | |
243 | ||
244 | imap += newaddrsize + newintsize; | |
245 | imaplen -= newaddrsize + newintsize; | |
246 | ||
247 | pr_debug(" -> imaplen=%d\n", imaplen); | |
248 | } | |
249 | if (!match) | |
250 | goto fail; | |
251 | ||
23616132 GL |
252 | /* |
253 | * Successfully parsed an interrrupt-map translation; copy new | |
254 | * interrupt specifier into the out_irq structure | |
255 | */ | |
23616132 GL |
256 | match_array = imap - newaddrsize - newintsize; |
257 | for (i = 0; i < newintsize; i++) | |
258 | out_irq->args[i] = be32_to_cpup(imap - newintsize + i); | |
259 | out_irq->args_count = intsize = newintsize; | |
7dc2e113 | 260 | addrsize = newaddrsize; |
7dc2e113 GL |
261 | |
262 | skiplevel: | |
263 | /* Iterate again with new parent */ | |
d23b2516 | 264 | out_irq->np = newpar; |
74a7f084 | 265 | pr_debug(" -> new parent: %s\n", of_node_full_name(newpar)); |
7dc2e113 GL |
266 | of_node_put(ipar); |
267 | ipar = newpar; | |
268 | newpar = NULL; | |
269 | } | |
270 | fail: | |
271 | of_node_put(ipar); | |
7dc2e113 GL |
272 | of_node_put(newpar); |
273 | ||
274 | return -EINVAL; | |
275 | } | |
0c02c800 | 276 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
7dc2e113 GL |
277 | |
278 | /** | |
0c02c800 | 279 | * of_irq_parse_one - Resolve an interrupt for a device |
7dc2e113 GL |
280 | * @device: the device whose interrupt is to be resolved |
281 | * @index: index of the interrupt to resolve | |
282 | * @out_irq: structure of_irq filled by this function | |
283 | * | |
23616132 GL |
284 | * This function resolves an interrupt for a node by walking the interrupt tree, |
285 | * finding which interrupt controller node it is attached to, and returning the | |
286 | * interrupt specifier that can be used to retrieve a Linux IRQ number. | |
7dc2e113 | 287 | */ |
530210c7 | 288 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
7dc2e113 GL |
289 | { |
290 | struct device_node *p; | |
d2f71839 | 291 | const __be32 *intspec, *tmp, *addr; |
7dc2e113 | 292 | u32 intsize, intlen; |
d7c14605 | 293 | int i, res; |
7dc2e113 | 294 | |
0c02c800 | 295 | pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index); |
7dc2e113 GL |
296 | |
297 | /* OldWorld mac stuff is "special", handle out of line */ | |
298 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
0c02c800 | 299 | return of_irq_parse_oldworld(device, index, out_irq); |
7dc2e113 | 300 | |
79d97015 GL |
301 | /* Get the reg property (if any) */ |
302 | addr = of_get_property(device, "reg", NULL); | |
303 | ||
a9ecdc0f FF |
304 | /* Try the new-style interrupts-extended first */ |
305 | res = of_parse_phandle_with_args(device, "interrupts-extended", | |
306 | "#interrupt-cells", index, out_irq); | |
307 | if (!res) | |
308 | return of_irq_parse_raw(addr, out_irq); | |
309 | ||
7dc2e113 GL |
310 | /* Get the interrupts property */ |
311 | intspec = of_get_property(device, "interrupts", &intlen); | |
a9ecdc0f FF |
312 | if (intspec == NULL) |
313 | return -EINVAL; | |
314 | ||
d2f71839 | 315 | intlen /= sizeof(*intspec); |
7dc2e113 | 316 | |
d2f71839 | 317 | pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen); |
7dc2e113 | 318 | |
7dc2e113 GL |
319 | /* Look for the interrupt parent. */ |
320 | p = of_irq_find_parent(device); | |
321 | if (p == NULL) | |
322 | return -EINVAL; | |
323 | ||
324 | /* Get size of interrupt specifier */ | |
325 | tmp = of_get_property(p, "#interrupt-cells", NULL); | |
d7c14605 LP |
326 | if (tmp == NULL) { |
327 | res = -EINVAL; | |
7dc2e113 | 328 | goto out; |
d7c14605 | 329 | } |
a7c194b0 | 330 | intsize = be32_to_cpu(*tmp); |
7dc2e113 GL |
331 | |
332 | pr_debug(" intsize=%d intlen=%d\n", intsize, intlen); | |
333 | ||
334 | /* Check index */ | |
d7c14605 LP |
335 | if ((index + 1) * intsize > intlen) { |
336 | res = -EINVAL; | |
7dc2e113 | 337 | goto out; |
d7c14605 | 338 | } |
7dc2e113 | 339 | |
23616132 GL |
340 | /* Copy intspec into irq structure */ |
341 | intspec += index * intsize; | |
342 | out_irq->np = p; | |
343 | out_irq->args_count = intsize; | |
344 | for (i = 0; i < intsize; i++) | |
345 | out_irq->args[i] = be32_to_cpup(intspec++); | |
346 | ||
347 | /* Check if there are any interrupt-map translations to process */ | |
348 | res = of_irq_parse_raw(addr, out_irq); | |
7dc2e113 GL |
349 | out: |
350 | of_node_put(p); | |
351 | return res; | |
352 | } | |
0c02c800 | 353 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
7dc2e113 GL |
354 | |
355 | /** | |
356 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource | |
357 | * @dev: pointer to device tree node | |
358 | * @index: zero-based index of the irq | |
359 | * @r: pointer to resource structure to return result into. | |
360 | */ | |
361 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) | |
362 | { | |
363 | int irq = irq_of_parse_and_map(dev, index); | |
364 | ||
365 | /* Only dereference the resource if both the | |
366 | * resource and the irq are valid. */ | |
77a7300a | 367 | if (r && irq) { |
661db794 BC |
368 | const char *name = NULL; |
369 | ||
cf9e2368 | 370 | memset(r, 0, sizeof(*r)); |
661db794 | 371 | /* |
ae107d06 | 372 | * Get optional "interrupt-names" property to add a name |
661db794 BC |
373 | * to the resource. |
374 | */ | |
375 | of_property_read_string_index(dev, "interrupt-names", index, | |
376 | &name); | |
377 | ||
7dc2e113 | 378 | r->start = r->end = irq; |
4a43d686 | 379 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); |
8804827b | 380 | r->name = name ? name : of_node_full_name(dev); |
7dc2e113 GL |
381 | } |
382 | ||
383 | return irq; | |
384 | } | |
385 | EXPORT_SYMBOL_GPL(of_irq_to_resource); | |
52f6537c | 386 | |
9ec36caf RH |
387 | /** |
388 | * of_irq_get - Decode a node's IRQ and return it as a Linux irq number | |
389 | * @dev: pointer to device tree node | |
390 | * @index: zero-based index of the irq | |
391 | * | |
392 | * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain | |
393 | * is not yet created. | |
394 | * | |
395 | */ | |
396 | int of_irq_get(struct device_node *dev, int index) | |
397 | { | |
398 | int rc; | |
399 | struct of_phandle_args oirq; | |
400 | struct irq_domain *domain; | |
401 | ||
402 | rc = of_irq_parse_one(dev, index, &oirq); | |
403 | if (rc) | |
404 | return rc; | |
405 | ||
406 | domain = irq_find_host(oirq.np); | |
407 | if (!domain) | |
408 | return -EPROBE_DEFER; | |
409 | ||
410 | return irq_create_of_mapping(&oirq); | |
411 | } | |
9eb08fb3 | 412 | EXPORT_SYMBOL_GPL(of_irq_get); |
9ec36caf | 413 | |
ad69674e GS |
414 | /** |
415 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number | |
416 | * @dev: pointer to device tree node | |
417 | * @name: irq name | |
418 | * | |
419 | * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain | |
420 | * is not yet created, or error code in case of any other failure. | |
421 | */ | |
422 | int of_irq_get_byname(struct device_node *dev, const char *name) | |
423 | { | |
424 | int index; | |
425 | ||
426 | if (unlikely(!name)) | |
427 | return -EINVAL; | |
428 | ||
429 | index = of_property_match_string(dev, "interrupt-names", name); | |
430 | if (index < 0) | |
431 | return index; | |
432 | ||
433 | return of_irq_get(dev, index); | |
434 | } | |
6602c452 | 435 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
ad69674e | 436 | |
52f6537c AS |
437 | /** |
438 | * of_irq_count - Count the number of IRQs a node uses | |
439 | * @dev: pointer to device tree node | |
440 | */ | |
441 | int of_irq_count(struct device_node *dev) | |
442 | { | |
3da52787 | 443 | struct of_phandle_args irq; |
52f6537c AS |
444 | int nr = 0; |
445 | ||
3da52787 | 446 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
52f6537c AS |
447 | nr++; |
448 | ||
449 | return nr; | |
450 | } | |
451 | ||
452 | /** | |
453 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info | |
454 | * @dev: pointer to device tree node | |
455 | * @res: array of resources to fill in | |
456 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) | |
457 | * | |
458 | * Returns the size of the filled in table (up to @nr_irqs). | |
459 | */ | |
460 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, | |
461 | int nr_irqs) | |
462 | { | |
463 | int i; | |
464 | ||
465 | for (i = 0; i < nr_irqs; i++, res++) | |
77a7300a | 466 | if (!of_irq_to_resource(dev, i, res)) |
52f6537c AS |
467 | break; |
468 | ||
469 | return i; | |
470 | } | |
a4f8bf22 | 471 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
c71a54b0 | 472 | |
48a9b733 | 473 | struct of_intc_desc { |
c71a54b0 RH |
474 | struct list_head list; |
475 | struct device_node *dev; | |
476 | struct device_node *interrupt_parent; | |
477 | }; | |
478 | ||
479 | /** | |
480 | * of_irq_init - Scan and init matching interrupt controllers in DT | |
481 | * @matches: 0 terminated array of nodes to match and init function to call | |
482 | * | |
483 | * This function scans the device tree for matching interrupt controller nodes, | |
484 | * and calls their initialization functions in order with parents first. | |
485 | */ | |
486 | void __init of_irq_init(const struct of_device_id *matches) | |
487 | { | |
488 | struct device_node *np, *parent = NULL; | |
48a9b733 | 489 | struct of_intc_desc *desc, *temp_desc; |
c71a54b0 RH |
490 | struct list_head intc_desc_list, intc_parent_list; |
491 | ||
492 | INIT_LIST_HEAD(&intc_desc_list); | |
493 | INIT_LIST_HEAD(&intc_parent_list); | |
494 | ||
495 | for_each_matching_node(np, matches) { | |
bf49be02 PC |
496 | if (!of_find_property(np, "interrupt-controller", NULL) || |
497 | !of_device_is_available(np)) | |
c71a54b0 RH |
498 | continue; |
499 | /* | |
48a9b733 | 500 | * Here, we allocate and populate an of_intc_desc with the node |
c71a54b0 RH |
501 | * pointer, interrupt-parent device_node etc. |
502 | */ | |
503 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
504 | if (WARN_ON(!desc)) | |
505 | goto err; | |
506 | ||
507 | desc->dev = np; | |
508 | desc->interrupt_parent = of_irq_find_parent(np); | |
d7fb6d0a RH |
509 | if (desc->interrupt_parent == np) |
510 | desc->interrupt_parent = NULL; | |
c71a54b0 RH |
511 | list_add_tail(&desc->list, &intc_desc_list); |
512 | } | |
513 | ||
514 | /* | |
515 | * The root irq controller is the one without an interrupt-parent. | |
516 | * That one goes first, followed by the controllers that reference it, | |
517 | * followed by the ones that reference the 2nd level controllers, etc. | |
518 | */ | |
519 | while (!list_empty(&intc_desc_list)) { | |
520 | /* | |
521 | * Process all controllers with the current 'parent'. | |
522 | * First pass will be looking for NULL as the parent. | |
523 | * The assumption is that NULL parent means a root controller. | |
524 | */ | |
525 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
526 | const struct of_device_id *match; | |
527 | int ret; | |
528 | of_irq_init_cb_t irq_init_cb; | |
529 | ||
530 | if (desc->interrupt_parent != parent) | |
531 | continue; | |
532 | ||
533 | list_del(&desc->list); | |
534 | match = of_match_node(matches, desc->dev); | |
535 | if (WARN(!match->data, | |
536 | "of_irq_init: no init function for %s\n", | |
537 | match->compatible)) { | |
538 | kfree(desc); | |
539 | continue; | |
540 | } | |
541 | ||
542 | pr_debug("of_irq_init: init %s @ %p, parent %p\n", | |
543 | match->compatible, | |
544 | desc->dev, desc->interrupt_parent); | |
d2e41518 | 545 | irq_init_cb = (of_irq_init_cb_t)match->data; |
c71a54b0 RH |
546 | ret = irq_init_cb(desc->dev, desc->interrupt_parent); |
547 | if (ret) { | |
548 | kfree(desc); | |
549 | continue; | |
550 | } | |
551 | ||
552 | /* | |
553 | * This one is now set up; add it to the parent list so | |
554 | * its children can get processed in a subsequent pass. | |
555 | */ | |
556 | list_add_tail(&desc->list, &intc_parent_list); | |
557 | } | |
558 | ||
559 | /* Get the next pending parent that might have children */ | |
c0cdfaa0 AL |
560 | desc = list_first_entry_or_null(&intc_parent_list, |
561 | typeof(*desc), list); | |
562 | if (!desc) { | |
c71a54b0 RH |
563 | pr_err("of_irq_init: children remain, but no parents\n"); |
564 | break; | |
565 | } | |
566 | list_del(&desc->list); | |
567 | parent = desc->dev; | |
568 | kfree(desc); | |
569 | } | |
570 | ||
571 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { | |
572 | list_del(&desc->list); | |
573 | kfree(desc); | |
574 | } | |
575 | err: | |
576 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
577 | list_del(&desc->list); | |
578 | kfree(desc); | |
579 | } | |
580 | } | |
c706c239 MZ |
581 | |
582 | /** | |
583 | * of_msi_configure - Set the msi_domain field of a device | |
584 | * @dev: device structure to associate with an MSI irq domain | |
585 | * @np: device node for that device | |
586 | */ | |
587 | void of_msi_configure(struct device *dev, struct device_node *np) | |
588 | { | |
589 | struct device_node *msi_np; | |
590 | struct irq_domain *d; | |
591 | ||
592 | msi_np = of_parse_phandle(np, "msi-parent", 0); | |
593 | if (!msi_np) | |
594 | return; | |
595 | ||
596 | d = irq_find_matching_host(msi_np, DOMAIN_BUS_PLATFORM_MSI); | |
597 | if (!d) | |
598 | d = irq_find_host(msi_np); | |
599 | dev_set_msi_domain(dev, d); | |
600 | } |