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 | */ | |
4c3141e0 | 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 | 79 | } |
4c3141e0 | 80 | EXPORT_SYMBOL_GPL(of_irq_find_parent); |
7dc2e113 GL |
81 | |
82 | /** | |
0c02c800 | 83 | * of_irq_parse_raw - Low level interrupt tree parsing |
7dc2e113 | 84 | * @parent: the device interrupt parent |
23616132 GL |
85 | * @addr: address specifier (start of "reg" property of the device) in be32 format |
86 | * @out_irq: structure of_irq updated by this function | |
7dc2e113 GL |
87 | * |
88 | * Returns 0 on success and a negative number on error | |
89 | * | |
90 | * This function is a low-level interrupt tree walking function. It | |
91 | * can be used to do a partial walk with synthetized reg and interrupts | |
92 | * properties, for example when resolving PCI interrupts when no device | |
23616132 GL |
93 | * node exist for the parent. It takes an interrupt specifier structure as |
94 | * input, walks the tree looking for any interrupt-map properties, translates | |
95 | * the specifier for each map, and then returns the translated map. | |
7dc2e113 | 96 | */ |
23616132 | 97 | int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) |
7dc2e113 GL |
98 | { |
99 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; | |
355e62f5 | 100 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; |
23616132 | 101 | const __be32 *match_array = initial_match_array; |
355e62f5 | 102 | const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 }; |
7dc2e113 GL |
103 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
104 | int imaplen, match, i; | |
105 | ||
624cfca5 GL |
106 | #ifdef DEBUG |
107 | of_print_phandle_args("of_irq_parse_raw: ", out_irq); | |
108 | #endif | |
7dc2e113 | 109 | |
23616132 | 110 | ipar = of_node_get(out_irq->np); |
7dc2e113 GL |
111 | |
112 | /* First get the #interrupt-cells property of the current cursor | |
113 | * that tells us how to interpret the passed-in intspec. If there | |
114 | * is none, we are nice and just walk up the tree | |
115 | */ | |
116 | do { | |
117 | tmp = of_get_property(ipar, "#interrupt-cells", NULL); | |
118 | if (tmp != NULL) { | |
a7c194b0 | 119 | intsize = be32_to_cpu(*tmp); |
7dc2e113 GL |
120 | break; |
121 | } | |
122 | tnode = ipar; | |
123 | ipar = of_irq_find_parent(ipar); | |
124 | of_node_put(tnode); | |
125 | } while (ipar); | |
126 | if (ipar == NULL) { | |
127 | pr_debug(" -> no parent found !\n"); | |
128 | goto fail; | |
129 | } | |
130 | ||
0c02c800 | 131 | pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize); |
7dc2e113 | 132 | |
23616132 | 133 | if (out_irq->args_count != intsize) |
7dc2e113 GL |
134 | return -EINVAL; |
135 | ||
136 | /* Look for this #address-cells. We have to implement the old linux | |
137 | * trick of looking for the parent here as some device-trees rely on it | |
138 | */ | |
139 | old = of_node_get(ipar); | |
140 | do { | |
141 | tmp = of_get_property(old, "#address-cells", NULL); | |
142 | tnode = of_get_parent(old); | |
143 | of_node_put(old); | |
144 | old = tnode; | |
145 | } while (old && tmp == NULL); | |
146 | of_node_put(old); | |
147 | old = NULL; | |
a7c194b0 | 148 | addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); |
7dc2e113 GL |
149 | |
150 | pr_debug(" -> addrsize=%d\n", addrsize); | |
151 | ||
355e62f5 GL |
152 | /* Range check so that the temporary buffer doesn't overflow */ |
153 | if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) | |
154 | goto fail; | |
155 | ||
23616132 GL |
156 | /* Precalculate the match array - this simplifies match loop */ |
157 | for (i = 0; i < addrsize; i++) | |
78119fd1 | 158 | initial_match_array[i] = addr ? addr[i] : 0; |
23616132 GL |
159 | for (i = 0; i < intsize; i++) |
160 | initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); | |
161 | ||
7dc2e113 GL |
162 | /* Now start the actual "proper" walk of the interrupt tree */ |
163 | while (ipar != NULL) { | |
164 | /* Now check if cursor is an interrupt-controller and if it is | |
165 | * then we are done | |
166 | */ | |
167 | if (of_get_property(ipar, "interrupt-controller", NULL) != | |
168 | NULL) { | |
169 | pr_debug(" -> got it !\n"); | |
7dc2e113 GL |
170 | return 0; |
171 | } | |
172 | ||
78119fd1 GL |
173 | /* |
174 | * interrupt-map parsing does not work without a reg | |
175 | * property when #address-cells != 0 | |
176 | */ | |
177 | if (addrsize && !addr) { | |
178 | pr_debug(" -> no reg passed in when needed !\n"); | |
179 | goto fail; | |
180 | } | |
181 | ||
7dc2e113 GL |
182 | /* Now look for an interrupt-map */ |
183 | imap = of_get_property(ipar, "interrupt-map", &imaplen); | |
184 | /* No interrupt map, check for an interrupt parent */ | |
185 | if (imap == NULL) { | |
186 | pr_debug(" -> no map, getting parent\n"); | |
187 | newpar = of_irq_find_parent(ipar); | |
188 | goto skiplevel; | |
189 | } | |
190 | imaplen /= sizeof(u32); | |
191 | ||
192 | /* Look for a mask */ | |
193 | imask = of_get_property(ipar, "interrupt-map-mask", NULL); | |
23616132 GL |
194 | if (!imask) |
195 | imask = dummy_imask; | |
7dc2e113 GL |
196 | |
197 | /* Parse interrupt-map */ | |
198 | match = 0; | |
199 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
200 | /* Compare specifiers */ | |
201 | match = 1; | |
23616132 | 202 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
74dac2ed | 203 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
7dc2e113 GL |
204 | |
205 | pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
206 | ||
207 | /* Get the interrupt parent */ | |
208 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
209 | newpar = of_node_get(of_irq_dflt_pic); | |
210 | else | |
9a6b2e58 | 211 | newpar = of_find_node_by_phandle(be32_to_cpup(imap)); |
7dc2e113 GL |
212 | imap++; |
213 | --imaplen; | |
214 | ||
215 | /* Check if not found */ | |
216 | if (newpar == NULL) { | |
217 | pr_debug(" -> imap parent not found !\n"); | |
218 | goto fail; | |
219 | } | |
220 | ||
1ca56e7d PC |
221 | if (!of_device_is_available(newpar)) |
222 | match = 0; | |
223 | ||
7dc2e113 GL |
224 | /* Get #interrupt-cells and #address-cells of new |
225 | * parent | |
226 | */ | |
227 | tmp = of_get_property(newpar, "#interrupt-cells", NULL); | |
228 | if (tmp == NULL) { | |
229 | pr_debug(" -> parent lacks #interrupt-cells!\n"); | |
230 | goto fail; | |
231 | } | |
a7c194b0 | 232 | newintsize = be32_to_cpu(*tmp); |
7dc2e113 | 233 | tmp = of_get_property(newpar, "#address-cells", NULL); |
a7c194b0 | 234 | newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp); |
7dc2e113 GL |
235 | |
236 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n", | |
237 | newintsize, newaddrsize); | |
238 | ||
239 | /* Check for malformed properties */ | |
355e62f5 GL |
240 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS)) |
241 | goto fail; | |
7dc2e113 GL |
242 | if (imaplen < (newaddrsize + newintsize)) |
243 | goto fail; | |
244 | ||
245 | imap += newaddrsize + newintsize; | |
246 | imaplen -= newaddrsize + newintsize; | |
247 | ||
248 | pr_debug(" -> imaplen=%d\n", imaplen); | |
249 | } | |
250 | if (!match) | |
251 | goto fail; | |
252 | ||
23616132 GL |
253 | /* |
254 | * Successfully parsed an interrrupt-map translation; copy new | |
255 | * interrupt specifier into the out_irq structure | |
256 | */ | |
23616132 GL |
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; | |
7dc2e113 | 261 | addrsize = newaddrsize; |
7dc2e113 GL |
262 | |
263 | skiplevel: | |
264 | /* Iterate again with new parent */ | |
d23b2516 | 265 | out_irq->np = newpar; |
74a7f084 | 266 | pr_debug(" -> new parent: %s\n", of_node_full_name(newpar)); |
7dc2e113 GL |
267 | of_node_put(ipar); |
268 | ipar = newpar; | |
269 | newpar = NULL; | |
270 | } | |
271 | fail: | |
272 | of_node_put(ipar); | |
7dc2e113 GL |
273 | of_node_put(newpar); |
274 | ||
275 | return -EINVAL; | |
276 | } | |
0c02c800 | 277 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
7dc2e113 GL |
278 | |
279 | /** | |
0c02c800 | 280 | * of_irq_parse_one - Resolve an interrupt for a device |
7dc2e113 GL |
281 | * @device: the device whose interrupt is to be resolved |
282 | * @index: index of the interrupt to resolve | |
283 | * @out_irq: structure of_irq filled by this function | |
284 | * | |
23616132 GL |
285 | * This function resolves an interrupt for a node by walking the interrupt tree, |
286 | * finding which interrupt controller node it is attached to, and returning the | |
287 | * interrupt specifier that can be used to retrieve a Linux IRQ number. | |
7dc2e113 | 288 | */ |
530210c7 | 289 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
7dc2e113 GL |
290 | { |
291 | struct device_node *p; | |
d2f71839 | 292 | const __be32 *intspec, *tmp, *addr; |
7dc2e113 | 293 | u32 intsize, intlen; |
d7c14605 | 294 | int i, res; |
7dc2e113 | 295 | |
0c02c800 | 296 | pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index); |
7dc2e113 GL |
297 | |
298 | /* OldWorld mac stuff is "special", handle out of line */ | |
299 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
0c02c800 | 300 | return of_irq_parse_oldworld(device, index, out_irq); |
7dc2e113 | 301 | |
79d97015 GL |
302 | /* Get the reg property (if any) */ |
303 | addr = of_get_property(device, "reg", NULL); | |
304 | ||
a9ecdc0f FF |
305 | /* Try the new-style interrupts-extended first */ |
306 | res = of_parse_phandle_with_args(device, "interrupts-extended", | |
307 | "#interrupt-cells", index, out_irq); | |
308 | if (!res) | |
309 | return of_irq_parse_raw(addr, out_irq); | |
310 | ||
7dc2e113 GL |
311 | /* Get the interrupts property */ |
312 | intspec = of_get_property(device, "interrupts", &intlen); | |
a9ecdc0f FF |
313 | if (intspec == NULL) |
314 | return -EINVAL; | |
315 | ||
d2f71839 | 316 | intlen /= sizeof(*intspec); |
7dc2e113 | 317 | |
d2f71839 | 318 | pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen); |
7dc2e113 | 319 | |
7dc2e113 GL |
320 | /* Look for the interrupt parent. */ |
321 | p = of_irq_find_parent(device); | |
322 | if (p == NULL) | |
323 | return -EINVAL; | |
324 | ||
325 | /* Get size of interrupt specifier */ | |
326 | tmp = of_get_property(p, "#interrupt-cells", NULL); | |
d7c14605 LP |
327 | if (tmp == NULL) { |
328 | res = -EINVAL; | |
7dc2e113 | 329 | goto out; |
d7c14605 | 330 | } |
a7c194b0 | 331 | intsize = be32_to_cpu(*tmp); |
7dc2e113 GL |
332 | |
333 | pr_debug(" intsize=%d intlen=%d\n", intsize, intlen); | |
334 | ||
335 | /* Check index */ | |
d7c14605 LP |
336 | if ((index + 1) * intsize > intlen) { |
337 | res = -EINVAL; | |
7dc2e113 | 338 | goto out; |
d7c14605 | 339 | } |
7dc2e113 | 340 | |
23616132 GL |
341 | /* Copy intspec into irq structure */ |
342 | intspec += index * intsize; | |
343 | out_irq->np = p; | |
344 | out_irq->args_count = intsize; | |
345 | for (i = 0; i < intsize; i++) | |
346 | out_irq->args[i] = be32_to_cpup(intspec++); | |
347 | ||
348 | /* Check if there are any interrupt-map translations to process */ | |
349 | res = of_irq_parse_raw(addr, out_irq); | |
7dc2e113 GL |
350 | out: |
351 | of_node_put(p); | |
352 | return res; | |
353 | } | |
0c02c800 | 354 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
7dc2e113 GL |
355 | |
356 | /** | |
357 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource | |
358 | * @dev: pointer to device tree node | |
359 | * @index: zero-based index of the irq | |
360 | * @r: pointer to resource structure to return result into. | |
361 | */ | |
362 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) | |
363 | { | |
364 | int irq = irq_of_parse_and_map(dev, index); | |
365 | ||
366 | /* Only dereference the resource if both the | |
367 | * resource and the irq are valid. */ | |
77a7300a | 368 | if (r && irq) { |
661db794 BC |
369 | const char *name = NULL; |
370 | ||
cf9e2368 | 371 | memset(r, 0, sizeof(*r)); |
661db794 | 372 | /* |
ae107d06 | 373 | * Get optional "interrupt-names" property to add a name |
661db794 BC |
374 | * to the resource. |
375 | */ | |
376 | of_property_read_string_index(dev, "interrupt-names", index, | |
377 | &name); | |
378 | ||
7dc2e113 | 379 | r->start = r->end = irq; |
4a43d686 | 380 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); |
8804827b | 381 | r->name = name ? name : of_node_full_name(dev); |
7dc2e113 GL |
382 | } |
383 | ||
384 | return irq; | |
385 | } | |
386 | EXPORT_SYMBOL_GPL(of_irq_to_resource); | |
52f6537c | 387 | |
9ec36caf RH |
388 | /** |
389 | * of_irq_get - Decode a node's IRQ and return it as a Linux irq number | |
390 | * @dev: pointer to device tree node | |
391 | * @index: zero-based index of the irq | |
392 | * | |
393 | * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain | |
394 | * is not yet created. | |
395 | * | |
396 | */ | |
397 | int of_irq_get(struct device_node *dev, int index) | |
398 | { | |
399 | int rc; | |
400 | struct of_phandle_args oirq; | |
401 | struct irq_domain *domain; | |
402 | ||
403 | rc = of_irq_parse_one(dev, index, &oirq); | |
404 | if (rc) | |
405 | return rc; | |
406 | ||
407 | domain = irq_find_host(oirq.np); | |
408 | if (!domain) | |
409 | return -EPROBE_DEFER; | |
410 | ||
411 | return irq_create_of_mapping(&oirq); | |
412 | } | |
9eb08fb3 | 413 | EXPORT_SYMBOL_GPL(of_irq_get); |
9ec36caf | 414 | |
ad69674e GS |
415 | /** |
416 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number | |
417 | * @dev: pointer to device tree node | |
418 | * @name: irq name | |
419 | * | |
420 | * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain | |
421 | * is not yet created, or error code in case of any other failure. | |
422 | */ | |
423 | int of_irq_get_byname(struct device_node *dev, const char *name) | |
424 | { | |
425 | int index; | |
426 | ||
427 | if (unlikely(!name)) | |
428 | return -EINVAL; | |
429 | ||
430 | index = of_property_match_string(dev, "interrupt-names", name); | |
431 | if (index < 0) | |
432 | return index; | |
433 | ||
434 | return of_irq_get(dev, index); | |
435 | } | |
6602c452 | 436 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
ad69674e | 437 | |
52f6537c AS |
438 | /** |
439 | * of_irq_count - Count the number of IRQs a node uses | |
440 | * @dev: pointer to device tree node | |
441 | */ | |
442 | int of_irq_count(struct device_node *dev) | |
443 | { | |
3da52787 | 444 | struct of_phandle_args irq; |
52f6537c AS |
445 | int nr = 0; |
446 | ||
3da52787 | 447 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
52f6537c AS |
448 | nr++; |
449 | ||
450 | return nr; | |
451 | } | |
452 | ||
453 | /** | |
454 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info | |
455 | * @dev: pointer to device tree node | |
456 | * @res: array of resources to fill in | |
457 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) | |
458 | * | |
459 | * Returns the size of the filled in table (up to @nr_irqs). | |
460 | */ | |
461 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, | |
462 | int nr_irqs) | |
463 | { | |
464 | int i; | |
465 | ||
466 | for (i = 0; i < nr_irqs; i++, res++) | |
77a7300a | 467 | if (!of_irq_to_resource(dev, i, res)) |
52f6537c AS |
468 | break; |
469 | ||
470 | return i; | |
471 | } | |
a4f8bf22 | 472 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
c71a54b0 | 473 | |
48a9b733 | 474 | struct of_intc_desc { |
c71a54b0 | 475 | struct list_head list; |
264041e3 | 476 | of_irq_init_cb_t irq_init_cb; |
c71a54b0 RH |
477 | struct device_node *dev; |
478 | struct device_node *interrupt_parent; | |
479 | }; | |
480 | ||
481 | /** | |
482 | * of_irq_init - Scan and init matching interrupt controllers in DT | |
483 | * @matches: 0 terminated array of nodes to match and init function to call | |
484 | * | |
485 | * This function scans the device tree for matching interrupt controller nodes, | |
486 | * and calls their initialization functions in order with parents first. | |
487 | */ | |
488 | void __init of_irq_init(const struct of_device_id *matches) | |
489 | { | |
264041e3 | 490 | const struct of_device_id *match; |
c71a54b0 | 491 | struct device_node *np, *parent = NULL; |
48a9b733 | 492 | struct of_intc_desc *desc, *temp_desc; |
c71a54b0 RH |
493 | struct list_head intc_desc_list, intc_parent_list; |
494 | ||
495 | INIT_LIST_HEAD(&intc_desc_list); | |
496 | INIT_LIST_HEAD(&intc_parent_list); | |
497 | ||
264041e3 | 498 | for_each_matching_node_and_match(np, matches, &match) { |
bf49be02 PC |
499 | if (!of_find_property(np, "interrupt-controller", NULL) || |
500 | !of_device_is_available(np)) | |
c71a54b0 | 501 | continue; |
264041e3 MY |
502 | |
503 | if (WARN(!match->data, "of_irq_init: no init function for %s\n", | |
504 | match->compatible)) | |
505 | continue; | |
506 | ||
c71a54b0 | 507 | /* |
48a9b733 | 508 | * Here, we allocate and populate an of_intc_desc with the node |
c71a54b0 RH |
509 | * pointer, interrupt-parent device_node etc. |
510 | */ | |
511 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
8363ccb9 JL |
512 | if (WARN_ON(!desc)) { |
513 | of_node_put(np); | |
c71a54b0 | 514 | goto err; |
8363ccb9 | 515 | } |
c71a54b0 | 516 | |
264041e3 | 517 | desc->irq_init_cb = match->data; |
8363ccb9 | 518 | desc->dev = of_node_get(np); |
c71a54b0 | 519 | desc->interrupt_parent = of_irq_find_parent(np); |
d7fb6d0a RH |
520 | if (desc->interrupt_parent == np) |
521 | desc->interrupt_parent = NULL; | |
c71a54b0 RH |
522 | list_add_tail(&desc->list, &intc_desc_list); |
523 | } | |
524 | ||
525 | /* | |
526 | * The root irq controller is the one without an interrupt-parent. | |
527 | * That one goes first, followed by the controllers that reference it, | |
528 | * followed by the ones that reference the 2nd level controllers, etc. | |
529 | */ | |
530 | while (!list_empty(&intc_desc_list)) { | |
531 | /* | |
532 | * Process all controllers with the current 'parent'. | |
533 | * First pass will be looking for NULL as the parent. | |
534 | * The assumption is that NULL parent means a root controller. | |
535 | */ | |
536 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
c71a54b0 | 537 | int ret; |
c71a54b0 RH |
538 | |
539 | if (desc->interrupt_parent != parent) | |
540 | continue; | |
541 | ||
542 | list_del(&desc->list); | |
c71a54b0 | 543 | |
264041e3 MY |
544 | pr_debug("of_irq_init: init %s (%p), parent %p\n", |
545 | desc->dev->full_name, | |
c71a54b0 | 546 | desc->dev, desc->interrupt_parent); |
264041e3 MY |
547 | ret = desc->irq_init_cb(desc->dev, |
548 | desc->interrupt_parent); | |
c71a54b0 RH |
549 | if (ret) { |
550 | kfree(desc); | |
551 | continue; | |
552 | } | |
553 | ||
554 | /* | |
555 | * This one is now set up; add it to the parent list so | |
556 | * its children can get processed in a subsequent pass. | |
557 | */ | |
558 | list_add_tail(&desc->list, &intc_parent_list); | |
559 | } | |
560 | ||
561 | /* Get the next pending parent that might have children */ | |
c0cdfaa0 AL |
562 | desc = list_first_entry_or_null(&intc_parent_list, |
563 | typeof(*desc), list); | |
564 | if (!desc) { | |
c71a54b0 RH |
565 | pr_err("of_irq_init: children remain, but no parents\n"); |
566 | break; | |
567 | } | |
568 | list_del(&desc->list); | |
569 | parent = desc->dev; | |
570 | kfree(desc); | |
571 | } | |
572 | ||
573 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { | |
574 | list_del(&desc->list); | |
575 | kfree(desc); | |
576 | } | |
577 | err: | |
578 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
579 | list_del(&desc->list); | |
8363ccb9 | 580 | of_node_put(desc->dev); |
c71a54b0 RH |
581 | kfree(desc); |
582 | } | |
583 | } | |
c706c239 | 584 | |
a251b263 MZ |
585 | static u32 __of_msi_map_rid(struct device *dev, struct device_node **np, |
586 | u32 rid_in) | |
8db02d8b DD |
587 | { |
588 | struct device *parent_dev; | |
589 | struct device_node *msi_controller_node; | |
a251b263 | 590 | struct device_node *msi_np = *np; |
8db02d8b DD |
591 | u32 map_mask, masked_rid, rid_base, msi_base, rid_len, phandle; |
592 | int msi_map_len; | |
593 | bool matched; | |
594 | u32 rid_out = rid_in; | |
595 | const __be32 *msi_map = NULL; | |
596 | ||
597 | /* | |
598 | * Walk up the device parent links looking for one with a | |
599 | * "msi-map" property. | |
600 | */ | |
601 | for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) { | |
602 | if (!parent_dev->of_node) | |
603 | continue; | |
604 | ||
605 | msi_map = of_get_property(parent_dev->of_node, | |
606 | "msi-map", &msi_map_len); | |
607 | if (!msi_map) | |
608 | continue; | |
609 | ||
610 | if (msi_map_len % (4 * sizeof(__be32))) { | |
611 | dev_err(parent_dev, "Error: Bad msi-map length: %d\n", | |
612 | msi_map_len); | |
613 | return rid_out; | |
614 | } | |
615 | /* We have a good parent_dev and msi_map, let's use them. */ | |
616 | break; | |
617 | } | |
618 | if (!msi_map) | |
619 | return rid_out; | |
620 | ||
621 | /* The default is to select all bits. */ | |
622 | map_mask = 0xffffffff; | |
623 | ||
624 | /* | |
625 | * Can be overridden by "msi-map-mask" property. If | |
626 | * of_property_read_u32() fails, the default is used. | |
627 | */ | |
628 | of_property_read_u32(parent_dev->of_node, "msi-map-mask", &map_mask); | |
629 | ||
630 | masked_rid = map_mask & rid_in; | |
631 | matched = false; | |
632 | while (!matched && msi_map_len >= 4 * sizeof(__be32)) { | |
633 | rid_base = be32_to_cpup(msi_map + 0); | |
634 | phandle = be32_to_cpup(msi_map + 1); | |
635 | msi_base = be32_to_cpup(msi_map + 2); | |
636 | rid_len = be32_to_cpup(msi_map + 3); | |
637 | ||
5d589d81 RM |
638 | if (rid_base & ~map_mask) { |
639 | dev_err(parent_dev, | |
640 | "Invalid msi-map translation - msi-map-mask (0x%x) ignores rid-base (0x%x)\n", | |
641 | map_mask, rid_base); | |
642 | return rid_out; | |
643 | } | |
644 | ||
8db02d8b DD |
645 | msi_controller_node = of_find_node_by_phandle(phandle); |
646 | ||
a251b263 MZ |
647 | matched = (masked_rid >= rid_base && |
648 | masked_rid < rid_base + rid_len); | |
649 | if (msi_np) | |
650 | matched &= msi_np == msi_controller_node; | |
651 | ||
652 | if (matched && !msi_np) { | |
653 | *np = msi_np = msi_controller_node; | |
654 | break; | |
655 | } | |
8db02d8b DD |
656 | |
657 | of_node_put(msi_controller_node); | |
658 | msi_map_len -= 4 * sizeof(__be32); | |
659 | msi_map += 4; | |
660 | } | |
661 | if (!matched) | |
662 | return rid_out; | |
663 | ||
5d589d81 | 664 | rid_out = masked_rid - rid_base + msi_base; |
8db02d8b DD |
665 | dev_dbg(dev, |
666 | "msi-map at: %s, using mask %08x, rid-base: %08x, msi-base: %08x, length: %08x, rid: %08x -> %08x\n", | |
667 | dev_name(parent_dev), map_mask, rid_base, msi_base, | |
668 | rid_len, rid_in, rid_out); | |
669 | ||
670 | return rid_out; | |
671 | } | |
48ae34fb | 672 | |
a251b263 MZ |
673 | /** |
674 | * of_msi_map_rid - Map a MSI requester ID for a device. | |
675 | * @dev: device for which the mapping is to be done. | |
676 | * @msi_np: device node of the expected msi controller. | |
677 | * @rid_in: unmapped MSI requester ID for the device. | |
678 | * | |
679 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
680 | * property. If found, apply the mapping to @rid_in. | |
681 | * | |
682 | * Returns the mapped MSI requester ID. | |
683 | */ | |
684 | u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in) | |
685 | { | |
686 | return __of_msi_map_rid(dev, &msi_np, rid_in); | |
687 | } | |
688 | ||
82b9b424 MZ |
689 | /** |
690 | * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain | |
691 | * @dev: device for which the mapping is to be done. | |
692 | * @rid: Requester ID for the device. | |
693 | * | |
694 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
695 | * property. | |
696 | * | |
697 | * Returns: the MSI domain for this device (or NULL on failure) | |
698 | */ | |
699 | struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 rid) | |
700 | { | |
701 | struct device_node *np = NULL; | |
702 | ||
703 | __of_msi_map_rid(dev, &np, rid); | |
14a0db3c | 704 | return irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI); |
82b9b424 MZ |
705 | } |
706 | ||
48ae34fb MZ |
707 | /** |
708 | * of_msi_get_domain - Use msi-parent to find the relevant MSI domain | |
709 | * @dev: device for which the domain is requested | |
710 | * @np: device node for @dev | |
711 | * @token: bus type for this domain | |
712 | * | |
713 | * Parse the msi-parent property (both the simple and the complex | |
714 | * versions), and returns the corresponding MSI domain. | |
715 | * | |
716 | * Returns: the MSI domain for this device (or NULL on failure). | |
717 | */ | |
718 | struct irq_domain *of_msi_get_domain(struct device *dev, | |
719 | struct device_node *np, | |
720 | enum irq_domain_bus_token token) | |
721 | { | |
722 | struct device_node *msi_np; | |
723 | struct irq_domain *d; | |
724 | ||
725 | /* Check for a single msi-parent property */ | |
726 | msi_np = of_parse_phandle(np, "msi-parent", 0); | |
727 | if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) { | |
14a0db3c | 728 | d = irq_find_matching_host(msi_np, token); |
48ae34fb MZ |
729 | if (!d) |
730 | of_node_put(msi_np); | |
731 | return d; | |
732 | } | |
733 | ||
734 | if (token == DOMAIN_BUS_PLATFORM_MSI) { | |
735 | /* Check for the complex msi-parent version */ | |
736 | struct of_phandle_args args; | |
737 | int index = 0; | |
738 | ||
739 | while (!of_parse_phandle_with_args(np, "msi-parent", | |
740 | "#msi-cells", | |
741 | index, &args)) { | |
14a0db3c | 742 | d = irq_find_matching_host(args.np, token); |
48ae34fb MZ |
743 | if (d) |
744 | return d; | |
745 | ||
746 | of_node_put(args.np); | |
747 | index++; | |
748 | } | |
749 | } | |
750 | ||
751 | return NULL; | |
752 | } | |
61c08240 MZ |
753 | |
754 | /** | |
755 | * of_msi_configure - Set the msi_domain field of a device | |
756 | * @dev: device structure to associate with an MSI irq domain | |
757 | * @np: device node for that device | |
758 | */ | |
759 | void of_msi_configure(struct device *dev, struct device_node *np) | |
760 | { | |
761 | dev_set_msi_domain(dev, | |
762 | of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI)); | |
763 | } |