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af6074fc | 1 | // SPDX-License-Identifier: GPL-2.0+ |
e3873444 GL |
2 | /* |
3 | * Derived from arch/i386/kernel/irq.c | |
4 | * Copyright (C) 1992 Linus Torvalds | |
5 | * Adapted from arch/i386 by Gary Thomas | |
6 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
7 | * Updated and modified by Cort Dougan <cort@fsmlabs.com> | |
8 | * Copyright (C) 1996-2001 Cort Dougan | |
9 | * Adapted for Power Macintosh by Paul Mackerras | |
10 | * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au) | |
11 | * | |
e3873444 GL |
12 | * This file contains the code used to make IRQ descriptions in the |
13 | * device tree to actual irq numbers on an interrupt controller | |
14 | * driver. | |
15 | */ | |
16 | ||
606ad42a RH |
17 | #define pr_fmt(fmt) "OF: " fmt |
18 | ||
c706c239 | 19 | #include <linux/device.h> |
e3873444 | 20 | #include <linux/errno.h> |
c71a54b0 | 21 | #include <linux/list.h> |
e3873444 GL |
22 | #include <linux/module.h> |
23 | #include <linux/of.h> | |
24 | #include <linux/of_irq.h> | |
987068fc | 25 | #include <linux/of_pci.h> |
e3873444 | 26 | #include <linux/string.h> |
c71a54b0 | 27 | #include <linux/slab.h> |
e3873444 GL |
28 | |
29 | /** | |
30 | * irq_of_parse_and_map - Parse and map an interrupt into linux virq space | |
d84ff46a | 31 | * @dev: Device node of the device whose interrupt is to be mapped |
e3873444 GL |
32 | * @index: Index of the interrupt to map |
33 | * | |
0c02c800 | 34 | * This function is a wrapper that chains of_irq_parse_one() and |
e3873444 GL |
35 | * irq_create_of_mapping() to make things easier to callers |
36 | */ | |
37 | unsigned int irq_of_parse_and_map(struct device_node *dev, int index) | |
38 | { | |
530210c7 | 39 | struct of_phandle_args oirq; |
e3873444 | 40 | |
0c02c800 | 41 | if (of_irq_parse_one(dev, index, &oirq)) |
77a7300a | 42 | return 0; |
e3873444 | 43 | |
e6d30ab1 | 44 | return irq_create_of_mapping(&oirq); |
e3873444 GL |
45 | } |
46 | EXPORT_SYMBOL_GPL(irq_of_parse_and_map); | |
7dc2e113 GL |
47 | |
48 | /** | |
49 | * of_irq_find_parent - Given a device node, find its interrupt parent node | |
50 | * @child: pointer to device node | |
51 | * | |
52 | * Returns a pointer to the interrupt parent node, or NULL if the interrupt | |
53 | * parent could not be determined. | |
54 | */ | |
4c3141e0 | 55 | struct device_node *of_irq_find_parent(struct device_node *child) |
7dc2e113 | 56 | { |
b4bbb029 | 57 | struct device_node *p; |
fa976ff7 | 58 | phandle parent; |
7dc2e113 | 59 | |
b4bbb029 | 60 | if (!of_node_get(child)) |
7dc2e113 GL |
61 | return NULL; |
62 | ||
63 | do { | |
fa976ff7 | 64 | if (of_property_read_u32(child, "interrupt-parent", &parent)) { |
b4bbb029 | 65 | p = of_get_parent(child); |
fa976ff7 | 66 | } else { |
7dc2e113 GL |
67 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) |
68 | p = of_node_get(of_irq_dflt_pic); | |
69 | else | |
fa976ff7 | 70 | p = of_find_node_by_phandle(parent); |
7dc2e113 | 71 | } |
b4bbb029 LT |
72 | of_node_put(child); |
73 | child = p; | |
7dc2e113 GL |
74 | } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL); |
75 | ||
b4bbb029 | 76 | return p; |
7dc2e113 | 77 | } |
4c3141e0 | 78 | EXPORT_SYMBOL_GPL(of_irq_find_parent); |
7dc2e113 GL |
79 | |
80 | /** | |
0c02c800 | 81 | * of_irq_parse_raw - Low level interrupt tree parsing |
23616132 | 82 | * @addr: address specifier (start of "reg" property of the device) in be32 format |
fae3b9cd | 83 | * @out_irq: structure of_phandle_args updated by this function |
7dc2e113 GL |
84 | * |
85 | * Returns 0 on success and a negative number on error | |
86 | * | |
87 | * This function is a low-level interrupt tree walking function. It | |
88 | * can be used to do a partial walk with synthetized reg and interrupts | |
89 | * properties, for example when resolving PCI interrupts when no device | |
23616132 GL |
90 | * node exist for the parent. It takes an interrupt specifier structure as |
91 | * input, walks the tree looking for any interrupt-map properties, translates | |
92 | * the specifier for each map, and then returns the translated map. | |
7dc2e113 | 93 | */ |
23616132 | 94 | int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) |
7dc2e113 GL |
95 | { |
96 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; | |
355e62f5 | 97 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; |
23616132 | 98 | const __be32 *match_array = initial_match_array; |
17a70355 | 99 | const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) }; |
7dc2e113 | 100 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
f1aa5484 | 101 | int imaplen, match, i, rc = -EINVAL; |
7dc2e113 | 102 | |
624cfca5 GL |
103 | #ifdef DEBUG |
104 | of_print_phandle_args("of_irq_parse_raw: ", out_irq); | |
105 | #endif | |
7dc2e113 | 106 | |
23616132 | 107 | ipar = of_node_get(out_irq->np); |
7dc2e113 GL |
108 | |
109 | /* First get the #interrupt-cells property of the current cursor | |
110 | * that tells us how to interpret the passed-in intspec. If there | |
111 | * is none, we are nice and just walk up the tree | |
112 | */ | |
113 | do { | |
fa976ff7 | 114 | if (!of_property_read_u32(ipar, "#interrupt-cells", &intsize)) |
7dc2e113 | 115 | break; |
7dc2e113 GL |
116 | tnode = ipar; |
117 | ipar = of_irq_find_parent(ipar); | |
118 | of_node_put(tnode); | |
119 | } while (ipar); | |
120 | if (ipar == NULL) { | |
121 | pr_debug(" -> no parent found !\n"); | |
122 | goto fail; | |
123 | } | |
124 | ||
0d638a07 | 125 | pr_debug("of_irq_parse_raw: ipar=%pOF, size=%d\n", ipar, intsize); |
7dc2e113 | 126 | |
23616132 | 127 | if (out_irq->args_count != intsize) |
f1aa5484 | 128 | goto fail; |
7dc2e113 GL |
129 | |
130 | /* Look for this #address-cells. We have to implement the old linux | |
131 | * trick of looking for the parent here as some device-trees rely on it | |
132 | */ | |
133 | old = of_node_get(ipar); | |
134 | do { | |
135 | tmp = of_get_property(old, "#address-cells", NULL); | |
136 | tnode = of_get_parent(old); | |
137 | of_node_put(old); | |
138 | old = tnode; | |
139 | } while (old && tmp == NULL); | |
140 | of_node_put(old); | |
141 | old = NULL; | |
a7c194b0 | 142 | addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); |
7dc2e113 GL |
143 | |
144 | pr_debug(" -> addrsize=%d\n", addrsize); | |
145 | ||
355e62f5 | 146 | /* Range check so that the temporary buffer doesn't overflow */ |
f1aa5484 GP |
147 | if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) { |
148 | rc = -EFAULT; | |
355e62f5 | 149 | goto fail; |
f1aa5484 | 150 | } |
355e62f5 | 151 | |
23616132 GL |
152 | /* Precalculate the match array - this simplifies match loop */ |
153 | for (i = 0; i < addrsize; i++) | |
78119fd1 | 154 | initial_match_array[i] = addr ? addr[i] : 0; |
23616132 GL |
155 | for (i = 0; i < intsize; i++) |
156 | initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); | |
157 | ||
7dc2e113 GL |
158 | /* Now start the actual "proper" walk of the interrupt tree */ |
159 | while (ipar != NULL) { | |
160 | /* Now check if cursor is an interrupt-controller and if it is | |
161 | * then we are done | |
162 | */ | |
6a245d95 | 163 | if (of_property_read_bool(ipar, "interrupt-controller")) { |
7dc2e113 | 164 | pr_debug(" -> got it !\n"); |
7dc2e113 GL |
165 | return 0; |
166 | } | |
167 | ||
78119fd1 GL |
168 | /* |
169 | * interrupt-map parsing does not work without a reg | |
170 | * property when #address-cells != 0 | |
171 | */ | |
172 | if (addrsize && !addr) { | |
173 | pr_debug(" -> no reg passed in when needed !\n"); | |
174 | goto fail; | |
175 | } | |
176 | ||
7dc2e113 GL |
177 | /* Now look for an interrupt-map */ |
178 | imap = of_get_property(ipar, "interrupt-map", &imaplen); | |
179 | /* No interrupt map, check for an interrupt parent */ | |
180 | if (imap == NULL) { | |
181 | pr_debug(" -> no map, getting parent\n"); | |
182 | newpar = of_irq_find_parent(ipar); | |
183 | goto skiplevel; | |
184 | } | |
185 | imaplen /= sizeof(u32); | |
186 | ||
187 | /* Look for a mask */ | |
188 | imask = of_get_property(ipar, "interrupt-map-mask", NULL); | |
23616132 GL |
189 | if (!imask) |
190 | imask = dummy_imask; | |
7dc2e113 GL |
191 | |
192 | /* Parse interrupt-map */ | |
193 | match = 0; | |
194 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
195 | /* Compare specifiers */ | |
196 | match = 1; | |
23616132 | 197 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
74dac2ed | 198 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
7dc2e113 GL |
199 | |
200 | pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
201 | ||
202 | /* Get the interrupt parent */ | |
203 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
204 | newpar = of_node_get(of_irq_dflt_pic); | |
205 | else | |
9a6b2e58 | 206 | newpar = of_find_node_by_phandle(be32_to_cpup(imap)); |
7dc2e113 GL |
207 | imap++; |
208 | --imaplen; | |
209 | ||
210 | /* Check if not found */ | |
211 | if (newpar == NULL) { | |
212 | pr_debug(" -> imap parent not found !\n"); | |
213 | goto fail; | |
214 | } | |
215 | ||
1ca56e7d PC |
216 | if (!of_device_is_available(newpar)) |
217 | match = 0; | |
218 | ||
7dc2e113 GL |
219 | /* Get #interrupt-cells and #address-cells of new |
220 | * parent | |
221 | */ | |
fa976ff7 SS |
222 | if (of_property_read_u32(newpar, "#interrupt-cells", |
223 | &newintsize)) { | |
7dc2e113 GL |
224 | pr_debug(" -> parent lacks #interrupt-cells!\n"); |
225 | goto fail; | |
226 | } | |
fa976ff7 SS |
227 | if (of_property_read_u32(newpar, "#address-cells", |
228 | &newaddrsize)) | |
229 | newaddrsize = 0; | |
7dc2e113 GL |
230 | |
231 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n", | |
232 | newintsize, newaddrsize); | |
233 | ||
234 | /* Check for malformed properties */ | |
f1aa5484 GP |
235 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS) |
236 | || (imaplen < (newaddrsize + newintsize))) { | |
237 | rc = -EFAULT; | |
7dc2e113 | 238 | goto fail; |
f1aa5484 | 239 | } |
7dc2e113 GL |
240 | |
241 | imap += newaddrsize + newintsize; | |
242 | imaplen -= newaddrsize + newintsize; | |
243 | ||
244 | pr_debug(" -> imaplen=%d\n", imaplen); | |
245 | } | |
246 | if (!match) | |
247 | goto fail; | |
248 | ||
23616132 GL |
249 | /* |
250 | * Successfully parsed an interrrupt-map translation; copy new | |
251 | * interrupt specifier into the out_irq structure | |
252 | */ | |
23616132 GL |
253 | match_array = imap - newaddrsize - newintsize; |
254 | for (i = 0; i < newintsize; i++) | |
255 | out_irq->args[i] = be32_to_cpup(imap - newintsize + i); | |
256 | out_irq->args_count = intsize = newintsize; | |
7dc2e113 | 257 | addrsize = newaddrsize; |
7dc2e113 GL |
258 | |
259 | skiplevel: | |
260 | /* Iterate again with new parent */ | |
d23b2516 | 261 | out_irq->np = newpar; |
0d638a07 | 262 | pr_debug(" -> new parent: %pOF\n", newpar); |
7dc2e113 GL |
263 | of_node_put(ipar); |
264 | ipar = newpar; | |
265 | newpar = NULL; | |
266 | } | |
f1aa5484 GP |
267 | rc = -ENOENT; /* No interrupt-map found */ |
268 | ||
7dc2e113 GL |
269 | fail: |
270 | of_node_put(ipar); | |
7dc2e113 GL |
271 | of_node_put(newpar); |
272 | ||
f1aa5484 | 273 | return rc; |
7dc2e113 | 274 | } |
0c02c800 | 275 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
7dc2e113 GL |
276 | |
277 | /** | |
0c02c800 | 278 | * of_irq_parse_one - Resolve an interrupt for a device |
7dc2e113 GL |
279 | * @device: the device whose interrupt is to be resolved |
280 | * @index: index of the interrupt to resolve | |
281 | * @out_irq: structure of_irq filled by this function | |
282 | * | |
23616132 GL |
283 | * This function resolves an interrupt for a node by walking the interrupt tree, |
284 | * finding which interrupt controller node it is attached to, and returning the | |
285 | * interrupt specifier that can be used to retrieve a Linux IRQ number. | |
7dc2e113 | 286 | */ |
530210c7 | 287 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
7dc2e113 GL |
288 | { |
289 | struct device_node *p; | |
b47fe22d RH |
290 | const __be32 *addr; |
291 | u32 intsize; | |
d7c14605 | 292 | int i, res; |
7dc2e113 | 293 | |
0d638a07 | 294 | pr_debug("of_irq_parse_one: dev=%pOF, index=%d\n", device, index); |
7dc2e113 GL |
295 | |
296 | /* OldWorld mac stuff is "special", handle out of line */ | |
297 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
0c02c800 | 298 | return of_irq_parse_oldworld(device, index, out_irq); |
7dc2e113 | 299 | |
79d97015 GL |
300 | /* Get the reg property (if any) */ |
301 | addr = of_get_property(device, "reg", NULL); | |
302 | ||
a9ecdc0f FF |
303 | /* Try the new-style interrupts-extended first */ |
304 | res = of_parse_phandle_with_args(device, "interrupts-extended", | |
305 | "#interrupt-cells", index, out_irq); | |
306 | if (!res) | |
307 | return of_irq_parse_raw(addr, out_irq); | |
308 | ||
7dc2e113 GL |
309 | /* Look for the interrupt parent. */ |
310 | p = of_irq_find_parent(device); | |
311 | if (p == NULL) | |
312 | return -EINVAL; | |
313 | ||
314 | /* Get size of interrupt specifier */ | |
fa976ff7 | 315 | if (of_property_read_u32(p, "#interrupt-cells", &intsize)) { |
d7c14605 | 316 | res = -EINVAL; |
7dc2e113 | 317 | goto out; |
d7c14605 | 318 | } |
7dc2e113 | 319 | |
b47fe22d | 320 | pr_debug(" parent=%pOF, intsize=%d\n", p, intsize); |
7dc2e113 | 321 | |
23616132 | 322 | /* Copy intspec into irq structure */ |
23616132 GL |
323 | out_irq->np = p; |
324 | out_irq->args_count = intsize; | |
b47fe22d RH |
325 | for (i = 0; i < intsize; i++) { |
326 | res = of_property_read_u32_index(device, "interrupts", | |
327 | (index * intsize) + i, | |
328 | out_irq->args + i); | |
329 | if (res) | |
330 | goto out; | |
331 | } | |
332 | ||
333 | pr_debug(" intspec=%d\n", *out_irq->args); | |
334 | ||
23616132 GL |
335 | |
336 | /* Check if there are any interrupt-map translations to process */ | |
337 | res = of_irq_parse_raw(addr, out_irq); | |
7dc2e113 GL |
338 | out: |
339 | of_node_put(p); | |
340 | return res; | |
341 | } | |
0c02c800 | 342 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
7dc2e113 GL |
343 | |
344 | /** | |
345 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource | |
346 | * @dev: pointer to device tree node | |
347 | * @index: zero-based index of the irq | |
348 | * @r: pointer to resource structure to return result into. | |
349 | */ | |
350 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) | |
351 | { | |
7a4228bb TP |
352 | int irq = of_irq_get(dev, index); |
353 | ||
354 | if (irq < 0) | |
355 | return irq; | |
7dc2e113 GL |
356 | |
357 | /* Only dereference the resource if both the | |
358 | * resource and the irq are valid. */ | |
77a7300a | 359 | if (r && irq) { |
661db794 BC |
360 | const char *name = NULL; |
361 | ||
cf9e2368 | 362 | memset(r, 0, sizeof(*r)); |
661db794 | 363 | /* |
ae107d06 | 364 | * Get optional "interrupt-names" property to add a name |
661db794 BC |
365 | * to the resource. |
366 | */ | |
367 | of_property_read_string_index(dev, "interrupt-names", index, | |
368 | &name); | |
369 | ||
7dc2e113 | 370 | r->start = r->end = irq; |
4a43d686 | 371 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); |
8804827b | 372 | r->name = name ? name : of_node_full_name(dev); |
7dc2e113 GL |
373 | } |
374 | ||
375 | return irq; | |
376 | } | |
377 | EXPORT_SYMBOL_GPL(of_irq_to_resource); | |
52f6537c | 378 | |
9ec36caf | 379 | /** |
39935466 | 380 | * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number |
9ec36caf | 381 | * @dev: pointer to device tree node |
39935466 | 382 | * @index: zero-based index of the IRQ |
9ec36caf | 383 | * |
39935466 SS |
384 | * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
385 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case | |
386 | * of any other failure. | |
9ec36caf RH |
387 | */ |
388 | int of_irq_get(struct device_node *dev, int index) | |
389 | { | |
390 | int rc; | |
391 | struct of_phandle_args oirq; | |
392 | struct irq_domain *domain; | |
393 | ||
394 | rc = of_irq_parse_one(dev, index, &oirq); | |
395 | if (rc) | |
396 | return rc; | |
397 | ||
398 | domain = irq_find_host(oirq.np); | |
399 | if (!domain) | |
400 | return -EPROBE_DEFER; | |
401 | ||
402 | return irq_create_of_mapping(&oirq); | |
403 | } | |
9eb08fb3 | 404 | EXPORT_SYMBOL_GPL(of_irq_get); |
9ec36caf | 405 | |
ad69674e | 406 | /** |
39935466 | 407 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number |
ad69674e | 408 | * @dev: pointer to device tree node |
39935466 | 409 | * @name: IRQ name |
ad69674e | 410 | * |
39935466 SS |
411 | * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
412 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case | |
413 | * of any other failure. | |
ad69674e GS |
414 | */ |
415 | int of_irq_get_byname(struct device_node *dev, const char *name) | |
416 | { | |
417 | int index; | |
418 | ||
419 | if (unlikely(!name)) | |
420 | return -EINVAL; | |
421 | ||
422 | index = of_property_match_string(dev, "interrupt-names", name); | |
423 | if (index < 0) | |
424 | return index; | |
425 | ||
426 | return of_irq_get(dev, index); | |
427 | } | |
6602c452 | 428 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
ad69674e | 429 | |
52f6537c AS |
430 | /** |
431 | * of_irq_count - Count the number of IRQs a node uses | |
432 | * @dev: pointer to device tree node | |
433 | */ | |
434 | int of_irq_count(struct device_node *dev) | |
435 | { | |
3da52787 | 436 | struct of_phandle_args irq; |
52f6537c AS |
437 | int nr = 0; |
438 | ||
3da52787 | 439 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
52f6537c AS |
440 | nr++; |
441 | ||
442 | return nr; | |
443 | } | |
444 | ||
445 | /** | |
446 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info | |
447 | * @dev: pointer to device tree node | |
448 | * @res: array of resources to fill in | |
449 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) | |
450 | * | |
451 | * Returns the size of the filled in table (up to @nr_irqs). | |
452 | */ | |
453 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, | |
454 | int nr_irqs) | |
455 | { | |
456 | int i; | |
457 | ||
458 | for (i = 0; i < nr_irqs; i++, res++) | |
531da740 | 459 | if (of_irq_to_resource(dev, i, res) <= 0) |
52f6537c AS |
460 | break; |
461 | ||
462 | return i; | |
463 | } | |
a4f8bf22 | 464 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
c71a54b0 | 465 | |
48a9b733 | 466 | struct of_intc_desc { |
c71a54b0 | 467 | struct list_head list; |
264041e3 | 468 | of_irq_init_cb_t irq_init_cb; |
c71a54b0 RH |
469 | struct device_node *dev; |
470 | struct device_node *interrupt_parent; | |
471 | }; | |
472 | ||
473 | /** | |
474 | * of_irq_init - Scan and init matching interrupt controllers in DT | |
475 | * @matches: 0 terminated array of nodes to match and init function to call | |
476 | * | |
477 | * This function scans the device tree for matching interrupt controller nodes, | |
478 | * and calls their initialization functions in order with parents first. | |
479 | */ | |
480 | void __init of_irq_init(const struct of_device_id *matches) | |
481 | { | |
264041e3 | 482 | const struct of_device_id *match; |
c71a54b0 | 483 | struct device_node *np, *parent = NULL; |
48a9b733 | 484 | struct of_intc_desc *desc, *temp_desc; |
c71a54b0 RH |
485 | struct list_head intc_desc_list, intc_parent_list; |
486 | ||
487 | INIT_LIST_HEAD(&intc_desc_list); | |
488 | INIT_LIST_HEAD(&intc_parent_list); | |
489 | ||
264041e3 | 490 | for_each_matching_node_and_match(np, matches, &match) { |
6a245d95 | 491 | if (!of_property_read_bool(np, "interrupt-controller") || |
bf49be02 | 492 | !of_device_is_available(np)) |
c71a54b0 | 493 | continue; |
264041e3 MY |
494 | |
495 | if (WARN(!match->data, "of_irq_init: no init function for %s\n", | |
496 | match->compatible)) | |
497 | continue; | |
498 | ||
c71a54b0 | 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); | |
8363ccb9 JL |
504 | if (WARN_ON(!desc)) { |
505 | of_node_put(np); | |
c71a54b0 | 506 | goto err; |
8363ccb9 | 507 | } |
c71a54b0 | 508 | |
264041e3 | 509 | desc->irq_init_cb = match->data; |
8363ccb9 | 510 | desc->dev = of_node_get(np); |
c71a54b0 | 511 | desc->interrupt_parent = of_irq_find_parent(np); |
d7fb6d0a RH |
512 | if (desc->interrupt_parent == np) |
513 | desc->interrupt_parent = NULL; | |
c71a54b0 RH |
514 | list_add_tail(&desc->list, &intc_desc_list); |
515 | } | |
516 | ||
517 | /* | |
518 | * The root irq controller is the one without an interrupt-parent. | |
519 | * That one goes first, followed by the controllers that reference it, | |
520 | * followed by the ones that reference the 2nd level controllers, etc. | |
521 | */ | |
522 | while (!list_empty(&intc_desc_list)) { | |
523 | /* | |
524 | * Process all controllers with the current 'parent'. | |
525 | * First pass will be looking for NULL as the parent. | |
526 | * The assumption is that NULL parent means a root controller. | |
527 | */ | |
528 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
c71a54b0 | 529 | int ret; |
c71a54b0 RH |
530 | |
531 | if (desc->interrupt_parent != parent) | |
532 | continue; | |
533 | ||
534 | list_del(&desc->list); | |
c71a54b0 | 535 | |
e55aeb6b PZ |
536 | of_node_set_flag(desc->dev, OF_POPULATED); |
537 | ||
0d638a07 RH |
538 | pr_debug("of_irq_init: init %pOF (%p), parent %p\n", |
539 | desc->dev, | |
c71a54b0 | 540 | desc->dev, desc->interrupt_parent); |
264041e3 MY |
541 | ret = desc->irq_init_cb(desc->dev, |
542 | desc->interrupt_parent); | |
c71a54b0 | 543 | if (ret) { |
e55aeb6b | 544 | of_node_clear_flag(desc->dev, OF_POPULATED); |
c71a54b0 RH |
545 | kfree(desc); |
546 | continue; | |
547 | } | |
548 | ||
549 | /* | |
550 | * This one is now set up; add it to the parent list so | |
551 | * its children can get processed in a subsequent pass. | |
552 | */ | |
553 | list_add_tail(&desc->list, &intc_parent_list); | |
554 | } | |
555 | ||
556 | /* Get the next pending parent that might have children */ | |
c0cdfaa0 AL |
557 | desc = list_first_entry_or_null(&intc_parent_list, |
558 | typeof(*desc), list); | |
559 | if (!desc) { | |
c71a54b0 RH |
560 | pr_err("of_irq_init: children remain, but no parents\n"); |
561 | break; | |
562 | } | |
563 | list_del(&desc->list); | |
564 | parent = desc->dev; | |
565 | kfree(desc); | |
566 | } | |
567 | ||
568 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { | |
569 | list_del(&desc->list); | |
570 | kfree(desc); | |
571 | } | |
572 | err: | |
573 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
574 | list_del(&desc->list); | |
8363ccb9 | 575 | of_node_put(desc->dev); |
c71a54b0 RH |
576 | kfree(desc); |
577 | } | |
578 | } | |
c706c239 | 579 | |
a251b263 MZ |
580 | static u32 __of_msi_map_rid(struct device *dev, struct device_node **np, |
581 | u32 rid_in) | |
8db02d8b DD |
582 | { |
583 | struct device *parent_dev; | |
8db02d8b | 584 | u32 rid_out = rid_in; |
8db02d8b DD |
585 | |
586 | /* | |
587 | * Walk up the device parent links looking for one with a | |
588 | * "msi-map" property. | |
589 | */ | |
987068fc RM |
590 | for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) |
591 | if (!of_pci_map_rid(parent_dev->of_node, rid_in, "msi-map", | |
592 | "msi-map-mask", np, &rid_out)) | |
a251b263 | 593 | break; |
8db02d8b DD |
594 | return rid_out; |
595 | } | |
48ae34fb | 596 | |
a251b263 MZ |
597 | /** |
598 | * of_msi_map_rid - Map a MSI requester ID for a device. | |
599 | * @dev: device for which the mapping is to be done. | |
600 | * @msi_np: device node of the expected msi controller. | |
601 | * @rid_in: unmapped MSI requester ID for the device. | |
602 | * | |
603 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
604 | * property. If found, apply the mapping to @rid_in. | |
605 | * | |
606 | * Returns the mapped MSI requester ID. | |
607 | */ | |
608 | u32 of_msi_map_rid(struct device *dev, struct device_node *msi_np, u32 rid_in) | |
609 | { | |
610 | return __of_msi_map_rid(dev, &msi_np, rid_in); | |
611 | } | |
612 | ||
82b9b424 MZ |
613 | /** |
614 | * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain | |
615 | * @dev: device for which the mapping is to be done. | |
616 | * @rid: Requester ID for the device. | |
617 | * | |
618 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
619 | * property. | |
620 | * | |
621 | * Returns: the MSI domain for this device (or NULL on failure) | |
622 | */ | |
623 | struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 rid) | |
624 | { | |
625 | struct device_node *np = NULL; | |
626 | ||
627 | __of_msi_map_rid(dev, &np, rid); | |
14a0db3c | 628 | return irq_find_matching_host(np, DOMAIN_BUS_PCI_MSI); |
82b9b424 MZ |
629 | } |
630 | ||
48ae34fb MZ |
631 | /** |
632 | * of_msi_get_domain - Use msi-parent to find the relevant MSI domain | |
633 | * @dev: device for which the domain is requested | |
634 | * @np: device node for @dev | |
635 | * @token: bus type for this domain | |
636 | * | |
637 | * Parse the msi-parent property (both the simple and the complex | |
638 | * versions), and returns the corresponding MSI domain. | |
639 | * | |
640 | * Returns: the MSI domain for this device (or NULL on failure). | |
641 | */ | |
642 | struct irq_domain *of_msi_get_domain(struct device *dev, | |
643 | struct device_node *np, | |
644 | enum irq_domain_bus_token token) | |
645 | { | |
646 | struct device_node *msi_np; | |
647 | struct irq_domain *d; | |
648 | ||
649 | /* Check for a single msi-parent property */ | |
650 | msi_np = of_parse_phandle(np, "msi-parent", 0); | |
651 | if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) { | |
14a0db3c | 652 | d = irq_find_matching_host(msi_np, token); |
48ae34fb MZ |
653 | if (!d) |
654 | of_node_put(msi_np); | |
655 | return d; | |
656 | } | |
657 | ||
658 | if (token == DOMAIN_BUS_PLATFORM_MSI) { | |
659 | /* Check for the complex msi-parent version */ | |
660 | struct of_phandle_args args; | |
661 | int index = 0; | |
662 | ||
663 | while (!of_parse_phandle_with_args(np, "msi-parent", | |
664 | "#msi-cells", | |
665 | index, &args)) { | |
14a0db3c | 666 | d = irq_find_matching_host(args.np, token); |
48ae34fb MZ |
667 | if (d) |
668 | return d; | |
669 | ||
670 | of_node_put(args.np); | |
671 | index++; | |
672 | } | |
673 | } | |
674 | ||
675 | return NULL; | |
676 | } | |
61c08240 MZ |
677 | |
678 | /** | |
679 | * of_msi_configure - Set the msi_domain field of a device | |
680 | * @dev: device structure to associate with an MSI irq domain | |
681 | * @np: device node for that device | |
682 | */ | |
683 | void of_msi_configure(struct device *dev, struct device_node *np) | |
684 | { | |
685 | dev_set_msi_domain(dev, | |
686 | of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI)); | |
687 | } | |
5282c181 | 688 | EXPORT_SYMBOL_GPL(of_msi_configure); |