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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 | ||
606ad42a RH |
21 | #define pr_fmt(fmt) "OF: " fmt |
22 | ||
c706c239 | 23 | #include <linux/device.h> |
e3873444 | 24 | #include <linux/errno.h> |
c71a54b0 | 25 | #include <linux/list.h> |
e3873444 GL |
26 | #include <linux/module.h> |
27 | #include <linux/of.h> | |
28 | #include <linux/of_irq.h> | |
987068fc | 29 | #include <linux/of_pci.h> |
e3873444 | 30 | #include <linux/string.h> |
c71a54b0 | 31 | #include <linux/slab.h> |
e3873444 GL |
32 | |
33 | /** | |
34 | * irq_of_parse_and_map - Parse and map an interrupt into linux virq space | |
d84ff46a | 35 | * @dev: Device node of the device whose interrupt is to be mapped |
e3873444 GL |
36 | * @index: Index of the interrupt to map |
37 | * | |
0c02c800 | 38 | * This function is a wrapper that chains of_irq_parse_one() and |
e3873444 GL |
39 | * irq_create_of_mapping() to make things easier to callers |
40 | */ | |
41 | unsigned int irq_of_parse_and_map(struct device_node *dev, int index) | |
42 | { | |
530210c7 | 43 | struct of_phandle_args oirq; |
e3873444 | 44 | |
0c02c800 | 45 | if (of_irq_parse_one(dev, index, &oirq)) |
77a7300a | 46 | return 0; |
e3873444 | 47 | |
e6d30ab1 | 48 | return irq_create_of_mapping(&oirq); |
e3873444 GL |
49 | } |
50 | EXPORT_SYMBOL_GPL(irq_of_parse_and_map); | |
7dc2e113 GL |
51 | |
52 | /** | |
53 | * of_irq_find_parent - Given a device node, find its interrupt parent node | |
54 | * @child: pointer to device node | |
55 | * | |
56 | * Returns a pointer to the interrupt parent node, or NULL if the interrupt | |
57 | * parent could not be determined. | |
58 | */ | |
4c3141e0 | 59 | struct device_node *of_irq_find_parent(struct device_node *child) |
7dc2e113 | 60 | { |
b4bbb029 | 61 | struct device_node *p; |
9a6b2e58 | 62 | const __be32 *parp; |
7dc2e113 | 63 | |
b4bbb029 | 64 | if (!of_node_get(child)) |
7dc2e113 GL |
65 | return NULL; |
66 | ||
67 | do { | |
b4bbb029 | 68 | parp = of_get_property(child, "interrupt-parent", NULL); |
7dc2e113 | 69 | if (parp == NULL) |
b4bbb029 | 70 | p = of_get_parent(child); |
7dc2e113 GL |
71 | else { |
72 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
73 | p = of_node_get(of_irq_dflt_pic); | |
74 | else | |
9a6b2e58 | 75 | p = of_find_node_by_phandle(be32_to_cpup(parp)); |
7dc2e113 | 76 | } |
b4bbb029 LT |
77 | of_node_put(child); |
78 | child = p; | |
7dc2e113 GL |
79 | } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL); |
80 | ||
b4bbb029 | 81 | return p; |
7dc2e113 | 82 | } |
4c3141e0 | 83 | EXPORT_SYMBOL_GPL(of_irq_find_parent); |
7dc2e113 GL |
84 | |
85 | /** | |
0c02c800 | 86 | * of_irq_parse_raw - Low level interrupt tree parsing |
7dc2e113 | 87 | * @parent: the device interrupt parent |
23616132 GL |
88 | * @addr: address specifier (start of "reg" property of the device) in be32 format |
89 | * @out_irq: structure of_irq updated by this function | |
7dc2e113 GL |
90 | * |
91 | * Returns 0 on success and a negative number on error | |
92 | * | |
93 | * This function is a low-level interrupt tree walking function. It | |
94 | * can be used to do a partial walk with synthetized reg and interrupts | |
95 | * properties, for example when resolving PCI interrupts when no device | |
23616132 GL |
96 | * node exist for the parent. It takes an interrupt specifier structure as |
97 | * input, walks the tree looking for any interrupt-map properties, translates | |
98 | * the specifier for each map, and then returns the translated map. | |
7dc2e113 | 99 | */ |
23616132 | 100 | int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) |
7dc2e113 GL |
101 | { |
102 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; | |
355e62f5 | 103 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; |
23616132 | 104 | const __be32 *match_array = initial_match_array; |
355e62f5 | 105 | const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 }; |
7dc2e113 GL |
106 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
107 | int imaplen, match, i; | |
108 | ||
624cfca5 GL |
109 | #ifdef DEBUG |
110 | of_print_phandle_args("of_irq_parse_raw: ", out_irq); | |
111 | #endif | |
7dc2e113 | 112 | |
23616132 | 113 | ipar = of_node_get(out_irq->np); |
7dc2e113 GL |
114 | |
115 | /* First get the #interrupt-cells property of the current cursor | |
116 | * that tells us how to interpret the passed-in intspec. If there | |
117 | * is none, we are nice and just walk up the tree | |
118 | */ | |
119 | do { | |
120 | tmp = of_get_property(ipar, "#interrupt-cells", NULL); | |
121 | if (tmp != NULL) { | |
a7c194b0 | 122 | intsize = be32_to_cpu(*tmp); |
7dc2e113 GL |
123 | break; |
124 | } | |
125 | tnode = ipar; | |
126 | ipar = of_irq_find_parent(ipar); | |
127 | of_node_put(tnode); | |
128 | } while (ipar); | |
129 | if (ipar == NULL) { | |
130 | pr_debug(" -> no parent found !\n"); | |
131 | goto fail; | |
132 | } | |
133 | ||
0c02c800 | 134 | pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize); |
7dc2e113 | 135 | |
23616132 | 136 | if (out_irq->args_count != intsize) |
7dc2e113 GL |
137 | return -EINVAL; |
138 | ||
139 | /* Look for this #address-cells. We have to implement the old linux | |
140 | * trick of looking for the parent here as some device-trees rely on it | |
141 | */ | |
142 | old = of_node_get(ipar); | |
143 | do { | |
144 | tmp = of_get_property(old, "#address-cells", NULL); | |
145 | tnode = of_get_parent(old); | |
146 | of_node_put(old); | |
147 | old = tnode; | |
148 | } while (old && tmp == NULL); | |
149 | of_node_put(old); | |
150 | old = NULL; | |
a7c194b0 | 151 | addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); |
7dc2e113 GL |
152 | |
153 | pr_debug(" -> addrsize=%d\n", addrsize); | |
154 | ||
355e62f5 GL |
155 | /* Range check so that the temporary buffer doesn't overflow */ |
156 | if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) | |
157 | goto fail; | |
158 | ||
23616132 GL |
159 | /* Precalculate the match array - this simplifies match loop */ |
160 | for (i = 0; i < addrsize; i++) | |
78119fd1 | 161 | initial_match_array[i] = addr ? addr[i] : 0; |
23616132 GL |
162 | for (i = 0; i < intsize; i++) |
163 | initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); | |
164 | ||
7dc2e113 GL |
165 | /* Now start the actual "proper" walk of the interrupt tree */ |
166 | while (ipar != NULL) { | |
167 | /* Now check if cursor is an interrupt-controller and if it is | |
168 | * then we are done | |
169 | */ | |
170 | if (of_get_property(ipar, "interrupt-controller", NULL) != | |
171 | NULL) { | |
172 | pr_debug(" -> got it !\n"); | |
7dc2e113 GL |
173 | return 0; |
174 | } | |
175 | ||
78119fd1 GL |
176 | /* |
177 | * interrupt-map parsing does not work without a reg | |
178 | * property when #address-cells != 0 | |
179 | */ | |
180 | if (addrsize && !addr) { | |
181 | pr_debug(" -> no reg passed in when needed !\n"); | |
182 | goto fail; | |
183 | } | |
184 | ||
7dc2e113 GL |
185 | /* Now look for an interrupt-map */ |
186 | imap = of_get_property(ipar, "interrupt-map", &imaplen); | |
187 | /* No interrupt map, check for an interrupt parent */ | |
188 | if (imap == NULL) { | |
189 | pr_debug(" -> no map, getting parent\n"); | |
190 | newpar = of_irq_find_parent(ipar); | |
191 | goto skiplevel; | |
192 | } | |
193 | imaplen /= sizeof(u32); | |
194 | ||
195 | /* Look for a mask */ | |
196 | imask = of_get_property(ipar, "interrupt-map-mask", NULL); | |
23616132 GL |
197 | if (!imask) |
198 | imask = dummy_imask; | |
7dc2e113 GL |
199 | |
200 | /* Parse interrupt-map */ | |
201 | match = 0; | |
202 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
203 | /* Compare specifiers */ | |
204 | match = 1; | |
23616132 | 205 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
74dac2ed | 206 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
7dc2e113 GL |
207 | |
208 | pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
209 | ||
210 | /* Get the interrupt parent */ | |
211 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
212 | newpar = of_node_get(of_irq_dflt_pic); | |
213 | else | |
9a6b2e58 | 214 | newpar = of_find_node_by_phandle(be32_to_cpup(imap)); |
7dc2e113 GL |
215 | imap++; |
216 | --imaplen; | |
217 | ||
218 | /* Check if not found */ | |
219 | if (newpar == NULL) { | |
220 | pr_debug(" -> imap parent not found !\n"); | |
221 | goto fail; | |
222 | } | |
223 | ||
1ca56e7d PC |
224 | if (!of_device_is_available(newpar)) |
225 | match = 0; | |
226 | ||
7dc2e113 GL |
227 | /* Get #interrupt-cells and #address-cells of new |
228 | * parent | |
229 | */ | |
230 | tmp = of_get_property(newpar, "#interrupt-cells", NULL); | |
231 | if (tmp == NULL) { | |
232 | pr_debug(" -> parent lacks #interrupt-cells!\n"); | |
233 | goto fail; | |
234 | } | |
a7c194b0 | 235 | newintsize = be32_to_cpu(*tmp); |
7dc2e113 | 236 | tmp = of_get_property(newpar, "#address-cells", NULL); |
a7c194b0 | 237 | newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp); |
7dc2e113 GL |
238 | |
239 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n", | |
240 | newintsize, newaddrsize); | |
241 | ||
242 | /* Check for malformed properties */ | |
355e62f5 GL |
243 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS)) |
244 | goto fail; | |
7dc2e113 GL |
245 | if (imaplen < (newaddrsize + newintsize)) |
246 | goto fail; | |
247 | ||
248 | imap += newaddrsize + newintsize; | |
249 | imaplen -= newaddrsize + newintsize; | |
250 | ||
251 | pr_debug(" -> imaplen=%d\n", imaplen); | |
252 | } | |
253 | if (!match) | |
254 | goto fail; | |
255 | ||
23616132 GL |
256 | /* |
257 | * Successfully parsed an interrrupt-map translation; copy new | |
258 | * interrupt specifier into the out_irq structure | |
259 | */ | |
23616132 GL |
260 | match_array = imap - newaddrsize - newintsize; |
261 | for (i = 0; i < newintsize; i++) | |
262 | out_irq->args[i] = be32_to_cpup(imap - newintsize + i); | |
263 | out_irq->args_count = intsize = newintsize; | |
7dc2e113 | 264 | addrsize = newaddrsize; |
7dc2e113 GL |
265 | |
266 | skiplevel: | |
267 | /* Iterate again with new parent */ | |
d23b2516 | 268 | out_irq->np = newpar; |
74a7f084 | 269 | pr_debug(" -> new parent: %s\n", of_node_full_name(newpar)); |
7dc2e113 GL |
270 | of_node_put(ipar); |
271 | ipar = newpar; | |
272 | newpar = NULL; | |
273 | } | |
274 | fail: | |
275 | of_node_put(ipar); | |
7dc2e113 GL |
276 | of_node_put(newpar); |
277 | ||
278 | return -EINVAL; | |
279 | } | |
0c02c800 | 280 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
7dc2e113 GL |
281 | |
282 | /** | |
0c02c800 | 283 | * of_irq_parse_one - Resolve an interrupt for a device |
7dc2e113 GL |
284 | * @device: the device whose interrupt is to be resolved |
285 | * @index: index of the interrupt to resolve | |
286 | * @out_irq: structure of_irq filled by this function | |
287 | * | |
23616132 GL |
288 | * This function resolves an interrupt for a node by walking the interrupt tree, |
289 | * finding which interrupt controller node it is attached to, and returning the | |
290 | * interrupt specifier that can be used to retrieve a Linux IRQ number. | |
7dc2e113 | 291 | */ |
530210c7 | 292 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
7dc2e113 GL |
293 | { |
294 | struct device_node *p; | |
d2f71839 | 295 | const __be32 *intspec, *tmp, *addr; |
7dc2e113 | 296 | u32 intsize, intlen; |
d7c14605 | 297 | int i, res; |
7dc2e113 | 298 | |
0c02c800 | 299 | pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index); |
7dc2e113 GL |
300 | |
301 | /* OldWorld mac stuff is "special", handle out of line */ | |
302 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
0c02c800 | 303 | return of_irq_parse_oldworld(device, index, out_irq); |
7dc2e113 | 304 | |
79d97015 GL |
305 | /* Get the reg property (if any) */ |
306 | addr = of_get_property(device, "reg", NULL); | |
307 | ||
a9ecdc0f FF |
308 | /* Try the new-style interrupts-extended first */ |
309 | res = of_parse_phandle_with_args(device, "interrupts-extended", | |
310 | "#interrupt-cells", index, out_irq); | |
311 | if (!res) | |
312 | return of_irq_parse_raw(addr, out_irq); | |
313 | ||
7dc2e113 GL |
314 | /* Get the interrupts property */ |
315 | intspec = of_get_property(device, "interrupts", &intlen); | |
a9ecdc0f FF |
316 | if (intspec == NULL) |
317 | return -EINVAL; | |
318 | ||
d2f71839 | 319 | intlen /= sizeof(*intspec); |
7dc2e113 | 320 | |
d2f71839 | 321 | pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen); |
7dc2e113 | 322 | |
7dc2e113 GL |
323 | /* Look for the interrupt parent. */ |
324 | p = of_irq_find_parent(device); | |
325 | if (p == NULL) | |
326 | return -EINVAL; | |
327 | ||
328 | /* Get size of interrupt specifier */ | |
329 | tmp = of_get_property(p, "#interrupt-cells", NULL); | |
d7c14605 LP |
330 | if (tmp == NULL) { |
331 | res = -EINVAL; | |
7dc2e113 | 332 | goto out; |
d7c14605 | 333 | } |
a7c194b0 | 334 | intsize = be32_to_cpu(*tmp); |
7dc2e113 GL |
335 | |
336 | pr_debug(" intsize=%d intlen=%d\n", intsize, intlen); | |
337 | ||
338 | /* Check index */ | |
d7c14605 LP |
339 | if ((index + 1) * intsize > intlen) { |
340 | res = -EINVAL; | |
7dc2e113 | 341 | goto out; |
d7c14605 | 342 | } |
7dc2e113 | 343 | |
23616132 GL |
344 | /* Copy intspec into irq structure */ |
345 | intspec += index * intsize; | |
346 | out_irq->np = p; | |
347 | out_irq->args_count = intsize; | |
348 | for (i = 0; i < intsize; i++) | |
349 | out_irq->args[i] = be32_to_cpup(intspec++); | |
350 | ||
351 | /* Check if there are any interrupt-map translations to process */ | |
352 | res = of_irq_parse_raw(addr, out_irq); | |
7dc2e113 GL |
353 | out: |
354 | of_node_put(p); | |
355 | return res; | |
356 | } | |
0c02c800 | 357 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
7dc2e113 GL |
358 | |
359 | /** | |
360 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource | |
361 | * @dev: pointer to device tree node | |
362 | * @index: zero-based index of the irq | |
363 | * @r: pointer to resource structure to return result into. | |
364 | */ | |
365 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) | |
366 | { | |
367 | int irq = irq_of_parse_and_map(dev, index); | |
368 | ||
369 | /* Only dereference the resource if both the | |
370 | * resource and the irq are valid. */ | |
77a7300a | 371 | if (r && irq) { |
661db794 BC |
372 | const char *name = NULL; |
373 | ||
cf9e2368 | 374 | memset(r, 0, sizeof(*r)); |
661db794 | 375 | /* |
ae107d06 | 376 | * Get optional "interrupt-names" property to add a name |
661db794 BC |
377 | * to the resource. |
378 | */ | |
379 | of_property_read_string_index(dev, "interrupt-names", index, | |
380 | &name); | |
381 | ||
7dc2e113 | 382 | r->start = r->end = irq; |
4a43d686 | 383 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); |
8804827b | 384 | r->name = name ? name : of_node_full_name(dev); |
7dc2e113 GL |
385 | } |
386 | ||
387 | return irq; | |
388 | } | |
389 | EXPORT_SYMBOL_GPL(of_irq_to_resource); | |
52f6537c | 390 | |
9ec36caf | 391 | /** |
39935466 | 392 | * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number |
9ec36caf | 393 | * @dev: pointer to device tree node |
39935466 | 394 | * @index: zero-based index of the IRQ |
9ec36caf | 395 | * |
39935466 SS |
396 | * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
397 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case | |
398 | * of any other failure. | |
9ec36caf RH |
399 | */ |
400 | int of_irq_get(struct device_node *dev, int index) | |
401 | { | |
402 | int rc; | |
403 | struct of_phandle_args oirq; | |
404 | struct irq_domain *domain; | |
405 | ||
406 | rc = of_irq_parse_one(dev, index, &oirq); | |
407 | if (rc) | |
408 | return rc; | |
409 | ||
410 | domain = irq_find_host(oirq.np); | |
411 | if (!domain) | |
412 | return -EPROBE_DEFER; | |
413 | ||
414 | return irq_create_of_mapping(&oirq); | |
415 | } | |
9eb08fb3 | 416 | EXPORT_SYMBOL_GPL(of_irq_get); |
9ec36caf | 417 | |
ad69674e | 418 | /** |
39935466 | 419 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number |
ad69674e | 420 | * @dev: pointer to device tree node |
39935466 | 421 | * @name: IRQ name |
ad69674e | 422 | * |
39935466 SS |
423 | * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
424 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case | |
425 | * of any other failure. | |
ad69674e GS |
426 | */ |
427 | int of_irq_get_byname(struct device_node *dev, const char *name) | |
428 | { | |
429 | int index; | |
430 | ||
431 | if (unlikely(!name)) | |
432 | return -EINVAL; | |
433 | ||
434 | index = of_property_match_string(dev, "interrupt-names", name); | |
435 | if (index < 0) | |
436 | return index; | |
437 | ||
438 | return of_irq_get(dev, index); | |
439 | } | |
6602c452 | 440 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
ad69674e | 441 | |
52f6537c AS |
442 | /** |
443 | * of_irq_count - Count the number of IRQs a node uses | |
444 | * @dev: pointer to device tree node | |
445 | */ | |
446 | int of_irq_count(struct device_node *dev) | |
447 | { | |
3da52787 | 448 | struct of_phandle_args irq; |
52f6537c AS |
449 | int nr = 0; |
450 | ||
3da52787 | 451 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
52f6537c AS |
452 | nr++; |
453 | ||
454 | return nr; | |
455 | } | |
456 | ||
457 | /** | |
458 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info | |
459 | * @dev: pointer to device tree node | |
460 | * @res: array of resources to fill in | |
461 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) | |
462 | * | |
463 | * Returns the size of the filled in table (up to @nr_irqs). | |
464 | */ | |
465 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, | |
466 | int nr_irqs) | |
467 | { | |
468 | int i; | |
469 | ||
470 | for (i = 0; i < nr_irqs; i++, res++) | |
77a7300a | 471 | if (!of_irq_to_resource(dev, i, res)) |
52f6537c AS |
472 | break; |
473 | ||
474 | return i; | |
475 | } | |
a4f8bf22 | 476 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
c71a54b0 | 477 | |
48a9b733 | 478 | struct of_intc_desc { |
c71a54b0 | 479 | struct list_head list; |
264041e3 | 480 | of_irq_init_cb_t irq_init_cb; |
c71a54b0 RH |
481 | struct device_node *dev; |
482 | struct device_node *interrupt_parent; | |
483 | }; | |
484 | ||
485 | /** | |
486 | * of_irq_init - Scan and init matching interrupt controllers in DT | |
487 | * @matches: 0 terminated array of nodes to match and init function to call | |
488 | * | |
489 | * This function scans the device tree for matching interrupt controller nodes, | |
490 | * and calls their initialization functions in order with parents first. | |
491 | */ | |
492 | void __init of_irq_init(const struct of_device_id *matches) | |
493 | { | |
264041e3 | 494 | const struct of_device_id *match; |
c71a54b0 | 495 | struct device_node *np, *parent = NULL; |
48a9b733 | 496 | struct of_intc_desc *desc, *temp_desc; |
c71a54b0 RH |
497 | struct list_head intc_desc_list, intc_parent_list; |
498 | ||
499 | INIT_LIST_HEAD(&intc_desc_list); | |
500 | INIT_LIST_HEAD(&intc_parent_list); | |
501 | ||
264041e3 | 502 | for_each_matching_node_and_match(np, matches, &match) { |
bf49be02 PC |
503 | if (!of_find_property(np, "interrupt-controller", NULL) || |
504 | !of_device_is_available(np)) | |
c71a54b0 | 505 | continue; |
264041e3 MY |
506 | |
507 | if (WARN(!match->data, "of_irq_init: no init function for %s\n", | |
508 | match->compatible)) | |
509 | continue; | |
510 | ||
c71a54b0 | 511 | /* |
48a9b733 | 512 | * Here, we allocate and populate an of_intc_desc with the node |
c71a54b0 RH |
513 | * pointer, interrupt-parent device_node etc. |
514 | */ | |
515 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
8363ccb9 JL |
516 | if (WARN_ON(!desc)) { |
517 | of_node_put(np); | |
c71a54b0 | 518 | goto err; |
8363ccb9 | 519 | } |
c71a54b0 | 520 | |
264041e3 | 521 | desc->irq_init_cb = match->data; |
8363ccb9 | 522 | desc->dev = of_node_get(np); |
c71a54b0 | 523 | desc->interrupt_parent = of_irq_find_parent(np); |
d7fb6d0a RH |
524 | if (desc->interrupt_parent == np) |
525 | desc->interrupt_parent = NULL; | |
c71a54b0 RH |
526 | list_add_tail(&desc->list, &intc_desc_list); |
527 | } | |
528 | ||
529 | /* | |
530 | * The root irq controller is the one without an interrupt-parent. | |
531 | * That one goes first, followed by the controllers that reference it, | |
532 | * followed by the ones that reference the 2nd level controllers, etc. | |
533 | */ | |
534 | while (!list_empty(&intc_desc_list)) { | |
535 | /* | |
536 | * Process all controllers with the current 'parent'. | |
537 | * First pass will be looking for NULL as the parent. | |
538 | * The assumption is that NULL parent means a root controller. | |
539 | */ | |
540 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
c71a54b0 | 541 | int ret; |
c71a54b0 RH |
542 | |
543 | if (desc->interrupt_parent != parent) | |
544 | continue; | |
545 | ||
546 | list_del(&desc->list); | |
c71a54b0 | 547 | |
e55aeb6b PZ |
548 | of_node_set_flag(desc->dev, OF_POPULATED); |
549 | ||
264041e3 MY |
550 | pr_debug("of_irq_init: init %s (%p), parent %p\n", |
551 | desc->dev->full_name, | |
c71a54b0 | 552 | desc->dev, desc->interrupt_parent); |
264041e3 MY |
553 | ret = desc->irq_init_cb(desc->dev, |
554 | desc->interrupt_parent); | |
c71a54b0 | 555 | if (ret) { |
e55aeb6b | 556 | of_node_clear_flag(desc->dev, OF_POPULATED); |
c71a54b0 RH |
557 | kfree(desc); |
558 | continue; | |
559 | } | |
560 | ||
561 | /* | |
562 | * This one is now set up; add it to the parent list so | |
563 | * its children can get processed in a subsequent pass. | |
564 | */ | |
565 | list_add_tail(&desc->list, &intc_parent_list); | |
566 | } | |
567 | ||
568 | /* Get the next pending parent that might have children */ | |
c0cdfaa0 AL |
569 | desc = list_first_entry_or_null(&intc_parent_list, |
570 | typeof(*desc), list); | |
571 | if (!desc) { | |
c71a54b0 RH |
572 | pr_err("of_irq_init: children remain, but no parents\n"); |
573 | break; | |
574 | } | |
575 | list_del(&desc->list); | |
576 | parent = desc->dev; | |
577 | kfree(desc); | |
578 | } | |
579 | ||
580 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { | |
581 | list_del(&desc->list); | |
582 | kfree(desc); | |
583 | } | |
584 | err: | |
585 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
586 | list_del(&desc->list); | |
8363ccb9 | 587 | of_node_put(desc->dev); |
c71a54b0 RH |
588 | kfree(desc); |
589 | } | |
590 | } | |
c706c239 | 591 | |
a251b263 MZ |
592 | static u32 __of_msi_map_rid(struct device *dev, struct device_node **np, |
593 | u32 rid_in) | |
8db02d8b DD |
594 | { |
595 | struct device *parent_dev; | |
8db02d8b | 596 | u32 rid_out = rid_in; |
8db02d8b DD |
597 | |
598 | /* | |
599 | * Walk up the device parent links looking for one with a | |
600 | * "msi-map" property. | |
601 | */ | |
987068fc RM |
602 | for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) |
603 | if (!of_pci_map_rid(parent_dev->of_node, rid_in, "msi-map", | |
604 | "msi-map-mask", np, &rid_out)) | |
a251b263 | 605 | break; |
8db02d8b DD |
606 | return rid_out; |
607 | } | |
48ae34fb | 608 | |
a251b263 MZ |
609 | /** |
610 | * of_msi_map_rid - Map a MSI requester ID for a device. | |
611 | * @dev: device for which the mapping is to be done. | |
612 | * @msi_np: device node of the expected msi controller. | |
613 | * @rid_in: unmapped MSI requester ID for the device. | |
614 | * | |
615 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
616 | * property. If found, apply the mapping to @rid_in. | |
617 | * | |
618 | * Returns the mapped MSI requester ID. | |
619 | */ | |
620 | u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in) | |
621 | { | |
622 | return __of_msi_map_rid(dev, &msi_np, rid_in); | |
623 | } | |
624 | ||
82b9b424 MZ |
625 | /** |
626 | * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain | |
627 | * @dev: device for which the mapping is to be done. | |
628 | * @rid: Requester ID for the device. | |
629 | * | |
630 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
631 | * property. | |
632 | * | |
633 | * Returns: the MSI domain for this device (or NULL on failure) | |
634 | */ | |
635 | struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 rid) | |
636 | { | |
637 | struct device_node *np = NULL; | |
638 | ||
639 | __of_msi_map_rid(dev, &np, rid); | |
14a0db3c | 640 | return irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI); |
82b9b424 MZ |
641 | } |
642 | ||
48ae34fb MZ |
643 | /** |
644 | * of_msi_get_domain - Use msi-parent to find the relevant MSI domain | |
645 | * @dev: device for which the domain is requested | |
646 | * @np: device node for @dev | |
647 | * @token: bus type for this domain | |
648 | * | |
649 | * Parse the msi-parent property (both the simple and the complex | |
650 | * versions), and returns the corresponding MSI domain. | |
651 | * | |
652 | * Returns: the MSI domain for this device (or NULL on failure). | |
653 | */ | |
654 | struct irq_domain *of_msi_get_domain(struct device *dev, | |
655 | struct device_node *np, | |
656 | enum irq_domain_bus_token token) | |
657 | { | |
658 | struct device_node *msi_np; | |
659 | struct irq_domain *d; | |
660 | ||
661 | /* Check for a single msi-parent property */ | |
662 | msi_np = of_parse_phandle(np, "msi-parent", 0); | |
663 | if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) { | |
14a0db3c | 664 | d = irq_find_matching_host(msi_np, token); |
48ae34fb MZ |
665 | if (!d) |
666 | of_node_put(msi_np); | |
667 | return d; | |
668 | } | |
669 | ||
670 | if (token == DOMAIN_BUS_PLATFORM_MSI) { | |
671 | /* Check for the complex msi-parent version */ | |
672 | struct of_phandle_args args; | |
673 | int index = 0; | |
674 | ||
675 | while (!of_parse_phandle_with_args(np, "msi-parent", | |
676 | "#msi-cells", | |
677 | index, &args)) { | |
14a0db3c | 678 | d = irq_find_matching_host(args.np, token); |
48ae34fb MZ |
679 | if (d) |
680 | return d; | |
681 | ||
682 | of_node_put(args.np); | |
683 | index++; | |
684 | } | |
685 | } | |
686 | ||
687 | return NULL; | |
688 | } | |
61c08240 MZ |
689 | |
690 | /** | |
691 | * of_msi_configure - Set the msi_domain field of a device | |
692 | * @dev: device structure to associate with an MSI irq domain | |
693 | * @np: device node for that device | |
694 | */ | |
695 | void of_msi_configure(struct device *dev, struct device_node *np) | |
696 | { | |
697 | dev_set_msi_domain(dev, | |
698 | of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI)); | |
699 | } |