1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21#include <linux/errno.h>
22#include <linux/list.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/of_irq.h>
26#include <linux/string.h>
27#include <linux/slab.h>
28
29
30
31
32
33
34
35
36
37unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
38{
39 struct of_phandle_args oirq;
40
41 if (of_irq_parse_one(dev, index, &oirq))
42 return 0;
43
44 return irq_create_of_mapping(&oirq);
45}
46EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
47
48
49
50
51
52
53
54
55struct device_node *of_irq_find_parent(struct device_node *child)
56{
57 struct device_node *p;
58 const __be32 *parp;
59
60 if (!of_node_get(child))
61 return NULL;
62
63 do {
64 parp = of_get_property(child, "interrupt-parent", NULL);
65 if (parp == NULL)
66 p = of_get_parent(child);
67 else {
68 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
69 p = of_node_get(of_irq_dflt_pic);
70 else
71 p = of_find_node_by_phandle(be32_to_cpup(parp));
72 }
73 of_node_put(child);
74 child = p;
75 } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
76
77 return p;
78}
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
96{
97 struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
98 __be32 initial_match_array[MAX_PHANDLE_ARGS];
99 const __be32 *match_array = initial_match_array;
100 const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 };
101 u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
102 int imaplen, match, i;
103
104#ifdef DEBUG
105 of_print_phandle_args("of_irq_parse_raw: ", out_irq);
106#endif
107
108 ipar = of_node_get(out_irq->np);
109
110
111
112
113
114 do {
115 tmp = of_get_property(ipar, "#interrupt-cells", NULL);
116 if (tmp != NULL) {
117 intsize = be32_to_cpu(*tmp);
118 break;
119 }
120 tnode = ipar;
121 ipar = of_irq_find_parent(ipar);
122 of_node_put(tnode);
123 } while (ipar);
124 if (ipar == NULL) {
125 pr_debug(" -> no parent found !\n");
126 goto fail;
127 }
128
129 pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize);
130
131 if (out_irq->args_count != intsize)
132 return -EINVAL;
133
134
135
136
137 old = of_node_get(ipar);
138 do {
139 tmp = of_get_property(old, "#address-cells", NULL);
140 tnode = of_get_parent(old);
141 of_node_put(old);
142 old = tnode;
143 } while (old && tmp == NULL);
144 of_node_put(old);
145 old = NULL;
146 addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp);
147
148 pr_debug(" -> addrsize=%d\n", addrsize);
149
150
151 if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS))
152 goto fail;
153
154
155 for (i = 0; i < addrsize; i++)
156 initial_match_array[i] = addr ? addr[i] : 0;
157 for (i = 0; i < intsize; i++)
158 initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]);
159
160
161 while (ipar != NULL) {
162
163
164
165 if (of_get_property(ipar, "interrupt-controller", NULL) !=
166 NULL) {
167 pr_debug(" -> got it !\n");
168 return 0;
169 }
170
171
172
173
174
175 if (addrsize && !addr) {
176 pr_debug(" -> no reg passed in when needed !\n");
177 goto fail;
178 }
179
180
181 imap = of_get_property(ipar, "interrupt-map", &imaplen);
182
183 if (imap == NULL) {
184 pr_debug(" -> no map, getting parent\n");
185 newpar = of_irq_find_parent(ipar);
186 goto skiplevel;
187 }
188 imaplen /= sizeof(u32);
189
190
191 imask = of_get_property(ipar, "interrupt-map-mask", NULL);
192 if (!imask)
193 imask = dummy_imask;
194
195
196 match = 0;
197 while (imaplen > (addrsize + intsize + 1) && !match) {
198
199 match = 1;
200 for (i = 0; i < (addrsize + intsize); i++, imaplen--)
201 match &= !((match_array[i] ^ *imap++) & imask[i]);
202
203 pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
204
205
206 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
207 newpar = of_node_get(of_irq_dflt_pic);
208 else
209 newpar = of_find_node_by_phandle(be32_to_cpup(imap));
210 imap++;
211 --imaplen;
212
213
214 if (newpar == NULL) {
215 pr_debug(" -> imap parent not found !\n");
216 goto fail;
217 }
218
219 if (!of_device_is_available(newpar))
220 match = 0;
221
222
223
224
225 tmp = of_get_property(newpar, "#interrupt-cells", NULL);
226 if (tmp == NULL) {
227 pr_debug(" -> parent lacks #interrupt-cells!\n");
228 goto fail;
229 }
230 newintsize = be32_to_cpu(*tmp);
231 tmp = of_get_property(newpar, "#address-cells", NULL);
232 newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
233
234 pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
235 newintsize, newaddrsize);
236
237
238 if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS))
239 goto fail;
240 if (imaplen < (newaddrsize + newintsize))
241 goto fail;
242
243 imap += newaddrsize + newintsize;
244 imaplen -= newaddrsize + newintsize;
245
246 pr_debug(" -> imaplen=%d\n", imaplen);
247 }
248 if (!match)
249 goto fail;
250
251
252
253
254
255 out_irq->np = newpar;
256
257 match_array = imap - newaddrsize - newintsize;
258 for (i = 0; i < newintsize; i++)
259 out_irq->args[i] = be32_to_cpup(imap - newintsize + i);
260 out_irq->args_count = intsize = newintsize;
261 addrsize = newaddrsize;
262
263 skiplevel:
264
265 pr_debug(" -> new parent: %s\n", of_node_full_name(newpar));
266 of_node_put(ipar);
267 ipar = newpar;
268 newpar = NULL;
269 }
270 fail:
271 of_node_put(ipar);
272 of_node_put(newpar);
273
274 return -EINVAL;
275}
276EXPORT_SYMBOL_GPL(of_irq_parse_raw);
277
278
279
280
281
282
283
284
285
286
287
288int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq)
289{
290 struct device_node *p;
291 const __be32 *intspec, *tmp, *addr;
292 u32 intsize, intlen;
293 int i, res = -EINVAL;
294
295 pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index);
296
297
298 if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
299 return of_irq_parse_oldworld(device, index, out_irq);
300
301
302 addr = of_get_property(device, "reg", NULL);
303
304
305 intspec = of_get_property(device, "interrupts", &intlen);
306 if (intspec == NULL) {
307
308 res = of_parse_phandle_with_args(device, "interrupts-extended",
309 "#interrupt-cells", index, out_irq);
310 if (res)
311 return -EINVAL;
312 return of_irq_parse_raw(addr, out_irq);
313 }
314 intlen /= sizeof(*intspec);
315
316 pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);
317
318
319 p = of_irq_find_parent(device);
320 if (p == NULL)
321 return -EINVAL;
322
323
324 tmp = of_get_property(p, "#interrupt-cells", NULL);
325 if (tmp == NULL)
326 goto out;
327 intsize = be32_to_cpu(*tmp);
328
329 pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
330
331
332 if ((index + 1) * intsize > intlen)
333 goto out;
334
335
336 intspec += index * intsize;
337 out_irq->np = p;
338 out_irq->args_count = intsize;
339 for (i = 0; i < intsize; i++)
340 out_irq->args[i] = be32_to_cpup(intspec++);
341
342
343 res = of_irq_parse_raw(addr, out_irq);
344 out:
345 of_node_put(p);
346 return res;
347}
348EXPORT_SYMBOL_GPL(of_irq_parse_one);
349
350
351
352
353
354
355
356int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
357{
358 int irq = irq_of_parse_and_map(dev, index);
359
360
361
362 if (r && irq) {
363 const char *name = NULL;
364
365 memset(r, 0, sizeof(*r));
366
367
368
369
370 of_property_read_string_index(dev, "interrupt-names", index,
371 &name);
372
373 r->start = r->end = irq;
374 r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq));
375 r->name = name ? name : of_node_full_name(dev);
376 }
377
378 return irq;
379}
380EXPORT_SYMBOL_GPL(of_irq_to_resource);
381
382
383
384
385
386
387
388
389
390
391int of_irq_get(struct device_node *dev, int index)
392{
393 int rc;
394 struct of_phandle_args oirq;
395 struct irq_domain *domain;
396
397 rc = of_irq_parse_one(dev, index, &oirq);
398 if (rc)
399 return rc;
400
401 domain = irq_find_host(oirq.np);
402 if (!domain)
403 return -EPROBE_DEFER;
404
405 return irq_create_of_mapping(&oirq);
406}
407
408
409
410
411
412int of_irq_count(struct device_node *dev)
413{
414 struct of_phandle_args irq;
415 int nr = 0;
416
417 while (of_irq_parse_one(dev, nr, &irq) == 0)
418 nr++;
419
420 return nr;
421}
422
423
424
425
426
427
428
429
430
431int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
432 int nr_irqs)
433{
434 int i;
435
436 for (i = 0; i < nr_irqs; i++, res++)
437 if (!of_irq_to_resource(dev, i, res))
438 break;
439
440 return i;
441}
442EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
443
444struct intc_desc {
445 struct list_head list;
446 struct device_node *dev;
447 struct device_node *interrupt_parent;
448};
449
450
451
452
453
454
455
456
457void __init of_irq_init(const struct of_device_id *matches)
458{
459 struct device_node *np, *parent = NULL;
460 struct intc_desc *desc, *temp_desc;
461 struct list_head intc_desc_list, intc_parent_list;
462
463 INIT_LIST_HEAD(&intc_desc_list);
464 INIT_LIST_HEAD(&intc_parent_list);
465
466 for_each_matching_node(np, matches) {
467 if (!of_find_property(np, "interrupt-controller", NULL) ||
468 !of_device_is_available(np))
469 continue;
470
471
472
473
474 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
475 if (WARN_ON(!desc))
476 goto err;
477
478 desc->dev = np;
479 desc->interrupt_parent = of_irq_find_parent(np);
480 if (desc->interrupt_parent == np)
481 desc->interrupt_parent = NULL;
482 list_add_tail(&desc->list, &intc_desc_list);
483 }
484
485
486
487
488
489
490 while (!list_empty(&intc_desc_list)) {
491
492
493
494
495
496 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
497 const struct of_device_id *match;
498 int ret;
499 of_irq_init_cb_t irq_init_cb;
500
501 if (desc->interrupt_parent != parent)
502 continue;
503
504 list_del(&desc->list);
505 match = of_match_node(matches, desc->dev);
506 if (WARN(!match->data,
507 "of_irq_init: no init function for %s\n",
508 match->compatible)) {
509 kfree(desc);
510 continue;
511 }
512
513 pr_debug("of_irq_init: init %s @ %p, parent %p\n",
514 match->compatible,
515 desc->dev, desc->interrupt_parent);
516 irq_init_cb = (of_irq_init_cb_t)match->data;
517 ret = irq_init_cb(desc->dev, desc->interrupt_parent);
518 if (ret) {
519 kfree(desc);
520 continue;
521 }
522
523
524
525
526
527 list_add_tail(&desc->list, &intc_parent_list);
528 }
529
530
531 desc = list_first_entry_or_null(&intc_parent_list,
532 typeof(*desc), list);
533 if (!desc) {
534 pr_err("of_irq_init: children remain, but no parents\n");
535 break;
536 }
537 list_del(&desc->list);
538 parent = desc->dev;
539 kfree(desc);
540 }
541
542 list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) {
543 list_del(&desc->list);
544 kfree(desc);
545 }
546err:
547 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
548 list_del(&desc->list);
549 kfree(desc);
550 }
551}
552