]>
Commit | Line | Data |
---|---|---|
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> | |
25 | #include <linux/string.h> | |
c71a54b0 | 26 | #include <linux/slab.h> |
e3873444 GL |
27 | |
28 | /** | |
29 | * irq_of_parse_and_map - Parse and map an interrupt into linux virq space | |
d84ff46a | 30 | * @dev: Device node of the device whose interrupt is to be mapped |
e3873444 GL |
31 | * @index: Index of the interrupt to map |
32 | * | |
0c02c800 | 33 | * This function is a wrapper that chains of_irq_parse_one() and |
e3873444 GL |
34 | * irq_create_of_mapping() to make things easier to callers |
35 | */ | |
36 | unsigned int irq_of_parse_and_map(struct device_node *dev, int index) | |
37 | { | |
530210c7 | 38 | struct of_phandle_args oirq; |
e3873444 | 39 | |
0c02c800 | 40 | if (of_irq_parse_one(dev, index, &oirq)) |
77a7300a | 41 | return 0; |
e3873444 | 42 | |
e6d30ab1 | 43 | return irq_create_of_mapping(&oirq); |
e3873444 GL |
44 | } |
45 | EXPORT_SYMBOL_GPL(irq_of_parse_and_map); | |
7dc2e113 GL |
46 | |
47 | /** | |
48 | * of_irq_find_parent - Given a device node, find its interrupt parent node | |
49 | * @child: pointer to device node | |
50 | * | |
51 | * Returns a pointer to the interrupt parent node, or NULL if the interrupt | |
52 | * parent could not be determined. | |
53 | */ | |
4c3141e0 | 54 | struct device_node *of_irq_find_parent(struct device_node *child) |
7dc2e113 | 55 | { |
b4bbb029 | 56 | struct device_node *p; |
fa976ff7 | 57 | phandle parent; |
7dc2e113 | 58 | |
b4bbb029 | 59 | if (!of_node_get(child)) |
7dc2e113 GL |
60 | return NULL; |
61 | ||
62 | do { | |
fa976ff7 | 63 | if (of_property_read_u32(child, "interrupt-parent", &parent)) { |
b4bbb029 | 64 | p = of_get_parent(child); |
fa976ff7 | 65 | } else { |
7dc2e113 GL |
66 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) |
67 | p = of_node_get(of_irq_dflt_pic); | |
68 | else | |
fa976ff7 | 69 | p = of_find_node_by_phandle(parent); |
7dc2e113 | 70 | } |
b4bbb029 LT |
71 | of_node_put(child); |
72 | child = p; | |
7dc2e113 GL |
73 | } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL); |
74 | ||
b4bbb029 | 75 | return p; |
7dc2e113 | 76 | } |
4c3141e0 | 77 | EXPORT_SYMBOL_GPL(of_irq_find_parent); |
7dc2e113 GL |
78 | |
79 | /** | |
0c02c800 | 80 | * of_irq_parse_raw - Low level interrupt tree parsing |
23616132 | 81 | * @addr: address specifier (start of "reg" property of the device) in be32 format |
fae3b9cd | 82 | * @out_irq: structure of_phandle_args updated by this function |
7dc2e113 GL |
83 | * |
84 | * Returns 0 on success and a negative number on error | |
85 | * | |
86 | * This function is a low-level interrupt tree walking function. It | |
87 | * can be used to do a partial walk with synthetized reg and interrupts | |
88 | * properties, for example when resolving PCI interrupts when no device | |
23616132 GL |
89 | * node exist for the parent. It takes an interrupt specifier structure as |
90 | * input, walks the tree looking for any interrupt-map properties, translates | |
91 | * the specifier for each map, and then returns the translated map. | |
7dc2e113 | 92 | */ |
23616132 | 93 | int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) |
7dc2e113 GL |
94 | { |
95 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; | |
355e62f5 | 96 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; |
23616132 | 97 | const __be32 *match_array = initial_match_array; |
17a70355 | 98 | const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) }; |
7dc2e113 | 99 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
f1aa5484 | 100 | int imaplen, match, i, rc = -EINVAL; |
7dc2e113 | 101 | |
624cfca5 GL |
102 | #ifdef DEBUG |
103 | of_print_phandle_args("of_irq_parse_raw: ", out_irq); | |
104 | #endif | |
7dc2e113 | 105 | |
23616132 | 106 | ipar = of_node_get(out_irq->np); |
7dc2e113 GL |
107 | |
108 | /* First get the #interrupt-cells property of the current cursor | |
109 | * that tells us how to interpret the passed-in intspec. If there | |
110 | * is none, we are nice and just walk up the tree | |
111 | */ | |
112 | do { | |
fa976ff7 | 113 | if (!of_property_read_u32(ipar, "#interrupt-cells", &intsize)) |
7dc2e113 | 114 | break; |
7dc2e113 GL |
115 | tnode = ipar; |
116 | ipar = of_irq_find_parent(ipar); | |
117 | of_node_put(tnode); | |
118 | } while (ipar); | |
119 | if (ipar == NULL) { | |
120 | pr_debug(" -> no parent found !\n"); | |
121 | goto fail; | |
122 | } | |
123 | ||
0d638a07 | 124 | pr_debug("of_irq_parse_raw: ipar=%pOF, size=%d\n", ipar, intsize); |
7dc2e113 | 125 | |
23616132 | 126 | if (out_irq->args_count != intsize) |
f1aa5484 | 127 | goto fail; |
7dc2e113 GL |
128 | |
129 | /* Look for this #address-cells. We have to implement the old linux | |
130 | * trick of looking for the parent here as some device-trees rely on it | |
131 | */ | |
132 | old = of_node_get(ipar); | |
133 | do { | |
134 | tmp = of_get_property(old, "#address-cells", NULL); | |
135 | tnode = of_get_parent(old); | |
136 | of_node_put(old); | |
137 | old = tnode; | |
138 | } while (old && tmp == NULL); | |
139 | of_node_put(old); | |
140 | old = NULL; | |
a7c194b0 | 141 | addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); |
7dc2e113 GL |
142 | |
143 | pr_debug(" -> addrsize=%d\n", addrsize); | |
144 | ||
355e62f5 | 145 | /* Range check so that the temporary buffer doesn't overflow */ |
f1aa5484 GP |
146 | if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) { |
147 | rc = -EFAULT; | |
355e62f5 | 148 | goto fail; |
f1aa5484 | 149 | } |
355e62f5 | 150 | |
23616132 GL |
151 | /* Precalculate the match array - this simplifies match loop */ |
152 | for (i = 0; i < addrsize; i++) | |
78119fd1 | 153 | initial_match_array[i] = addr ? addr[i] : 0; |
23616132 GL |
154 | for (i = 0; i < intsize; i++) |
155 | initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); | |
156 | ||
7dc2e113 GL |
157 | /* Now start the actual "proper" walk of the interrupt tree */ |
158 | while (ipar != NULL) { | |
159 | /* Now check if cursor is an interrupt-controller and if it is | |
160 | * then we are done | |
161 | */ | |
6a245d95 | 162 | if (of_property_read_bool(ipar, "interrupt-controller")) { |
7dc2e113 | 163 | pr_debug(" -> got it !\n"); |
7dc2e113 GL |
164 | return 0; |
165 | } | |
166 | ||
78119fd1 GL |
167 | /* |
168 | * interrupt-map parsing does not work without a reg | |
169 | * property when #address-cells != 0 | |
170 | */ | |
171 | if (addrsize && !addr) { | |
172 | pr_debug(" -> no reg passed in when needed !\n"); | |
173 | goto fail; | |
174 | } | |
175 | ||
7dc2e113 GL |
176 | /* Now look for an interrupt-map */ |
177 | imap = of_get_property(ipar, "interrupt-map", &imaplen); | |
178 | /* No interrupt map, check for an interrupt parent */ | |
179 | if (imap == NULL) { | |
180 | pr_debug(" -> no map, getting parent\n"); | |
181 | newpar = of_irq_find_parent(ipar); | |
182 | goto skiplevel; | |
183 | } | |
184 | imaplen /= sizeof(u32); | |
185 | ||
186 | /* Look for a mask */ | |
187 | imask = of_get_property(ipar, "interrupt-map-mask", NULL); | |
23616132 GL |
188 | if (!imask) |
189 | imask = dummy_imask; | |
7dc2e113 GL |
190 | |
191 | /* Parse interrupt-map */ | |
192 | match = 0; | |
193 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
194 | /* Compare specifiers */ | |
195 | match = 1; | |
23616132 | 196 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
74dac2ed | 197 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
7dc2e113 GL |
198 | |
199 | pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
200 | ||
201 | /* Get the interrupt parent */ | |
202 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
203 | newpar = of_node_get(of_irq_dflt_pic); | |
204 | else | |
9a6b2e58 | 205 | newpar = of_find_node_by_phandle(be32_to_cpup(imap)); |
7dc2e113 GL |
206 | imap++; |
207 | --imaplen; | |
208 | ||
209 | /* Check if not found */ | |
210 | if (newpar == NULL) { | |
211 | pr_debug(" -> imap parent not found !\n"); | |
212 | goto fail; | |
213 | } | |
214 | ||
1ca56e7d PC |
215 | if (!of_device_is_available(newpar)) |
216 | match = 0; | |
217 | ||
7dc2e113 GL |
218 | /* Get #interrupt-cells and #address-cells of new |
219 | * parent | |
220 | */ | |
fa976ff7 SS |
221 | if (of_property_read_u32(newpar, "#interrupt-cells", |
222 | &newintsize)) { | |
7dc2e113 GL |
223 | pr_debug(" -> parent lacks #interrupt-cells!\n"); |
224 | goto fail; | |
225 | } | |
fa976ff7 SS |
226 | if (of_property_read_u32(newpar, "#address-cells", |
227 | &newaddrsize)) | |
228 | newaddrsize = 0; | |
7dc2e113 GL |
229 | |
230 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n", | |
231 | newintsize, newaddrsize); | |
232 | ||
233 | /* Check for malformed properties */ | |
f1aa5484 GP |
234 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS) |
235 | || (imaplen < (newaddrsize + newintsize))) { | |
236 | rc = -EFAULT; | |
7dc2e113 | 237 | goto fail; |
f1aa5484 | 238 | } |
7dc2e113 GL |
239 | |
240 | imap += newaddrsize + newintsize; | |
241 | imaplen -= newaddrsize + newintsize; | |
242 | ||
243 | pr_debug(" -> imaplen=%d\n", imaplen); | |
244 | } | |
245 | if (!match) | |
246 | goto fail; | |
247 | ||
23616132 GL |
248 | /* |
249 | * Successfully parsed an interrrupt-map translation; copy new | |
250 | * interrupt specifier into the out_irq structure | |
251 | */ | |
23616132 GL |
252 | match_array = imap - newaddrsize - newintsize; |
253 | for (i = 0; i < newintsize; i++) | |
254 | out_irq->args[i] = be32_to_cpup(imap - newintsize + i); | |
255 | out_irq->args_count = intsize = newintsize; | |
7dc2e113 | 256 | addrsize = newaddrsize; |
7dc2e113 GL |
257 | |
258 | skiplevel: | |
259 | /* Iterate again with new parent */ | |
d23b2516 | 260 | out_irq->np = newpar; |
0d638a07 | 261 | pr_debug(" -> new parent: %pOF\n", newpar); |
7dc2e113 GL |
262 | of_node_put(ipar); |
263 | ipar = newpar; | |
264 | newpar = NULL; | |
265 | } | |
f1aa5484 GP |
266 | rc = -ENOENT; /* No interrupt-map found */ |
267 | ||
7dc2e113 GL |
268 | fail: |
269 | of_node_put(ipar); | |
7dc2e113 GL |
270 | of_node_put(newpar); |
271 | ||
f1aa5484 | 272 | return rc; |
7dc2e113 | 273 | } |
0c02c800 | 274 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
7dc2e113 GL |
275 | |
276 | /** | |
0c02c800 | 277 | * of_irq_parse_one - Resolve an interrupt for a device |
7dc2e113 GL |
278 | * @device: the device whose interrupt is to be resolved |
279 | * @index: index of the interrupt to resolve | |
83f82d7a | 280 | * @out_irq: structure of_phandle_args filled by this function |
7dc2e113 | 281 | * |
23616132 GL |
282 | * This function resolves an interrupt for a node by walking the interrupt tree, |
283 | * finding which interrupt controller node it is attached to, and returning the | |
284 | * interrupt specifier that can be used to retrieve a Linux IRQ number. | |
7dc2e113 | 285 | */ |
530210c7 | 286 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
7dc2e113 GL |
287 | { |
288 | struct device_node *p; | |
b47fe22d RH |
289 | const __be32 *addr; |
290 | u32 intsize; | |
d7c14605 | 291 | int i, res; |
7dc2e113 | 292 | |
0d638a07 | 293 | pr_debug("of_irq_parse_one: dev=%pOF, index=%d\n", device, index); |
7dc2e113 GL |
294 | |
295 | /* OldWorld mac stuff is "special", handle out of line */ | |
296 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
0c02c800 | 297 | return of_irq_parse_oldworld(device, index, out_irq); |
7dc2e113 | 298 | |
79d97015 GL |
299 | /* Get the reg property (if any) */ |
300 | addr = of_get_property(device, "reg", NULL); | |
301 | ||
a9ecdc0f FF |
302 | /* Try the new-style interrupts-extended first */ |
303 | res = of_parse_phandle_with_args(device, "interrupts-extended", | |
304 | "#interrupt-cells", index, out_irq); | |
305 | if (!res) | |
306 | return of_irq_parse_raw(addr, out_irq); | |
307 | ||
7dc2e113 GL |
308 | /* Look for the interrupt parent. */ |
309 | p = of_irq_find_parent(device); | |
310 | if (p == NULL) | |
311 | return -EINVAL; | |
312 | ||
313 | /* Get size of interrupt specifier */ | |
fa976ff7 | 314 | if (of_property_read_u32(p, "#interrupt-cells", &intsize)) { |
d7c14605 | 315 | res = -EINVAL; |
7dc2e113 | 316 | goto out; |
d7c14605 | 317 | } |
7dc2e113 | 318 | |
b47fe22d | 319 | pr_debug(" parent=%pOF, intsize=%d\n", p, intsize); |
7dc2e113 | 320 | |
23616132 | 321 | /* Copy intspec into irq structure */ |
23616132 GL |
322 | out_irq->np = p; |
323 | out_irq->args_count = intsize; | |
b47fe22d RH |
324 | for (i = 0; i < intsize; i++) { |
325 | res = of_property_read_u32_index(device, "interrupts", | |
326 | (index * intsize) + i, | |
327 | out_irq->args + i); | |
328 | if (res) | |
329 | goto out; | |
330 | } | |
331 | ||
332 | pr_debug(" intspec=%d\n", *out_irq->args); | |
333 | ||
23616132 GL |
334 | |
335 | /* Check if there are any interrupt-map translations to process */ | |
336 | res = of_irq_parse_raw(addr, out_irq); | |
7dc2e113 GL |
337 | out: |
338 | of_node_put(p); | |
339 | return res; | |
340 | } | |
0c02c800 | 341 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
7dc2e113 GL |
342 | |
343 | /** | |
344 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource | |
345 | * @dev: pointer to device tree node | |
346 | * @index: zero-based index of the irq | |
347 | * @r: pointer to resource structure to return result into. | |
348 | */ | |
349 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) | |
350 | { | |
7a4228bb TP |
351 | int irq = of_irq_get(dev, index); |
352 | ||
353 | if (irq < 0) | |
354 | return irq; | |
7dc2e113 GL |
355 | |
356 | /* Only dereference the resource if both the | |
357 | * resource and the irq are valid. */ | |
77a7300a | 358 | if (r && irq) { |
661db794 BC |
359 | const char *name = NULL; |
360 | ||
cf9e2368 | 361 | memset(r, 0, sizeof(*r)); |
661db794 | 362 | /* |
ae107d06 | 363 | * Get optional "interrupt-names" property to add a name |
661db794 BC |
364 | * to the resource. |
365 | */ | |
366 | of_property_read_string_index(dev, "interrupt-names", index, | |
367 | &name); | |
368 | ||
7dc2e113 | 369 | r->start = r->end = irq; |
4a43d686 | 370 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); |
8804827b | 371 | r->name = name ? name : of_node_full_name(dev); |
7dc2e113 GL |
372 | } |
373 | ||
374 | return irq; | |
375 | } | |
376 | EXPORT_SYMBOL_GPL(of_irq_to_resource); | |
52f6537c | 377 | |
9ec36caf | 378 | /** |
39935466 | 379 | * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number |
9ec36caf | 380 | * @dev: pointer to device tree node |
39935466 | 381 | * @index: zero-based index of the IRQ |
9ec36caf | 382 | * |
39935466 SS |
383 | * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
384 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case | |
385 | * of any other failure. | |
9ec36caf RH |
386 | */ |
387 | int of_irq_get(struct device_node *dev, int index) | |
388 | { | |
389 | int rc; | |
390 | struct of_phandle_args oirq; | |
391 | struct irq_domain *domain; | |
392 | ||
393 | rc = of_irq_parse_one(dev, index, &oirq); | |
394 | if (rc) | |
395 | return rc; | |
396 | ||
397 | domain = irq_find_host(oirq.np); | |
398 | if (!domain) | |
399 | return -EPROBE_DEFER; | |
400 | ||
401 | return irq_create_of_mapping(&oirq); | |
402 | } | |
9eb08fb3 | 403 | EXPORT_SYMBOL_GPL(of_irq_get); |
9ec36caf | 404 | |
ad69674e | 405 | /** |
39935466 | 406 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number |
ad69674e | 407 | * @dev: pointer to device tree node |
39935466 | 408 | * @name: IRQ name |
ad69674e | 409 | * |
39935466 SS |
410 | * Returns Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
411 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case | |
412 | * of any other failure. | |
ad69674e GS |
413 | */ |
414 | int of_irq_get_byname(struct device_node *dev, const char *name) | |
415 | { | |
416 | int index; | |
417 | ||
418 | if (unlikely(!name)) | |
419 | return -EINVAL; | |
420 | ||
421 | index = of_property_match_string(dev, "interrupt-names", name); | |
422 | if (index < 0) | |
423 | return index; | |
424 | ||
425 | return of_irq_get(dev, index); | |
426 | } | |
6602c452 | 427 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
ad69674e | 428 | |
52f6537c AS |
429 | /** |
430 | * of_irq_count - Count the number of IRQs a node uses | |
431 | * @dev: pointer to device tree node | |
432 | */ | |
433 | int of_irq_count(struct device_node *dev) | |
434 | { | |
3da52787 | 435 | struct of_phandle_args irq; |
52f6537c AS |
436 | int nr = 0; |
437 | ||
3da52787 | 438 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
52f6537c AS |
439 | nr++; |
440 | ||
441 | return nr; | |
442 | } | |
443 | ||
444 | /** | |
445 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info | |
446 | * @dev: pointer to device tree node | |
447 | * @res: array of resources to fill in | |
448 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) | |
449 | * | |
450 | * Returns the size of the filled in table (up to @nr_irqs). | |
451 | */ | |
452 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, | |
453 | int nr_irqs) | |
454 | { | |
455 | int i; | |
456 | ||
457 | for (i = 0; i < nr_irqs; i++, res++) | |
531da740 | 458 | if (of_irq_to_resource(dev, i, res) <= 0) |
52f6537c AS |
459 | break; |
460 | ||
461 | return i; | |
462 | } | |
a4f8bf22 | 463 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
c71a54b0 | 464 | |
48a9b733 | 465 | struct of_intc_desc { |
c71a54b0 | 466 | struct list_head list; |
264041e3 | 467 | of_irq_init_cb_t irq_init_cb; |
c71a54b0 RH |
468 | struct device_node *dev; |
469 | struct device_node *interrupt_parent; | |
470 | }; | |
471 | ||
472 | /** | |
473 | * of_irq_init - Scan and init matching interrupt controllers in DT | |
474 | * @matches: 0 terminated array of nodes to match and init function to call | |
475 | * | |
476 | * This function scans the device tree for matching interrupt controller nodes, | |
477 | * and calls their initialization functions in order with parents first. | |
478 | */ | |
479 | void __init of_irq_init(const struct of_device_id *matches) | |
480 | { | |
264041e3 | 481 | const struct of_device_id *match; |
c71a54b0 | 482 | struct device_node *np, *parent = NULL; |
48a9b733 | 483 | struct of_intc_desc *desc, *temp_desc; |
c71a54b0 RH |
484 | struct list_head intc_desc_list, intc_parent_list; |
485 | ||
486 | INIT_LIST_HEAD(&intc_desc_list); | |
487 | INIT_LIST_HEAD(&intc_parent_list); | |
488 | ||
264041e3 | 489 | for_each_matching_node_and_match(np, matches, &match) { |
6a245d95 | 490 | if (!of_property_read_bool(np, "interrupt-controller") || |
bf49be02 | 491 | !of_device_is_available(np)) |
c71a54b0 | 492 | continue; |
264041e3 MY |
493 | |
494 | if (WARN(!match->data, "of_irq_init: no init function for %s\n", | |
495 | match->compatible)) | |
496 | continue; | |
497 | ||
c71a54b0 | 498 | /* |
48a9b733 | 499 | * Here, we allocate and populate an of_intc_desc with the node |
c71a54b0 RH |
500 | * pointer, interrupt-parent device_node etc. |
501 | */ | |
502 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
6f7dc9a3 | 503 | if (!desc) { |
8363ccb9 | 504 | of_node_put(np); |
c71a54b0 | 505 | goto err; |
8363ccb9 | 506 | } |
c71a54b0 | 507 | |
264041e3 | 508 | desc->irq_init_cb = match->data; |
8363ccb9 | 509 | desc->dev = of_node_get(np); |
c71a54b0 | 510 | desc->interrupt_parent = of_irq_find_parent(np); |
d7fb6d0a RH |
511 | if (desc->interrupt_parent == np) |
512 | desc->interrupt_parent = NULL; | |
c71a54b0 RH |
513 | list_add_tail(&desc->list, &intc_desc_list); |
514 | } | |
515 | ||
516 | /* | |
517 | * The root irq controller is the one without an interrupt-parent. | |
518 | * That one goes first, followed by the controllers that reference it, | |
519 | * followed by the ones that reference the 2nd level controllers, etc. | |
520 | */ | |
521 | while (!list_empty(&intc_desc_list)) { | |
522 | /* | |
523 | * Process all controllers with the current 'parent'. | |
524 | * First pass will be looking for NULL as the parent. | |
525 | * The assumption is that NULL parent means a root controller. | |
526 | */ | |
527 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
c71a54b0 | 528 | int ret; |
c71a54b0 RH |
529 | |
530 | if (desc->interrupt_parent != parent) | |
531 | continue; | |
532 | ||
533 | list_del(&desc->list); | |
c71a54b0 | 534 | |
e55aeb6b PZ |
535 | of_node_set_flag(desc->dev, OF_POPULATED); |
536 | ||
0d638a07 RH |
537 | pr_debug("of_irq_init: init %pOF (%p), parent %p\n", |
538 | desc->dev, | |
c71a54b0 | 539 | desc->dev, desc->interrupt_parent); |
264041e3 MY |
540 | ret = desc->irq_init_cb(desc->dev, |
541 | desc->interrupt_parent); | |
c71a54b0 | 542 | if (ret) { |
e55aeb6b | 543 | of_node_clear_flag(desc->dev, OF_POPULATED); |
c71a54b0 RH |
544 | kfree(desc); |
545 | continue; | |
546 | } | |
547 | ||
548 | /* | |
549 | * This one is now set up; add it to the parent list so | |
550 | * its children can get processed in a subsequent pass. | |
551 | */ | |
552 | list_add_tail(&desc->list, &intc_parent_list); | |
553 | } | |
554 | ||
555 | /* Get the next pending parent that might have children */ | |
c0cdfaa0 AL |
556 | desc = list_first_entry_or_null(&intc_parent_list, |
557 | typeof(*desc), list); | |
558 | if (!desc) { | |
c71a54b0 RH |
559 | pr_err("of_irq_init: children remain, but no parents\n"); |
560 | break; | |
561 | } | |
562 | list_del(&desc->list); | |
563 | parent = desc->dev; | |
564 | kfree(desc); | |
565 | } | |
566 | ||
567 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { | |
568 | list_del(&desc->list); | |
569 | kfree(desc); | |
570 | } | |
571 | err: | |
572 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
573 | list_del(&desc->list); | |
8363ccb9 | 574 | of_node_put(desc->dev); |
c71a54b0 RH |
575 | kfree(desc); |
576 | } | |
577 | } | |
c706c239 | 578 | |
2bcdd8f2 LP |
579 | static u32 __of_msi_map_id(struct device *dev, struct device_node **np, |
580 | u32 id_in) | |
8db02d8b DD |
581 | { |
582 | struct device *parent_dev; | |
2bcdd8f2 | 583 | u32 id_out = id_in; |
8db02d8b DD |
584 | |
585 | /* | |
586 | * Walk up the device parent links looking for one with a | |
587 | * "msi-map" property. | |
588 | */ | |
987068fc | 589 | for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) |
2bcdd8f2 LP |
590 | if (!of_map_id(parent_dev->of_node, id_in, "msi-map", |
591 | "msi-map-mask", np, &id_out)) | |
a251b263 | 592 | break; |
2bcdd8f2 | 593 | return id_out; |
8db02d8b | 594 | } |
48ae34fb | 595 | |
a251b263 | 596 | /** |
2bcdd8f2 | 597 | * of_msi_map_id - Map a MSI ID for a device. |
a251b263 MZ |
598 | * @dev: device for which the mapping is to be done. |
599 | * @msi_np: device node of the expected msi controller. | |
2bcdd8f2 | 600 | * @id_in: unmapped MSI ID for the device. |
a251b263 MZ |
601 | * |
602 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
2bcdd8f2 | 603 | * property. If found, apply the mapping to @id_in. |
a251b263 | 604 | * |
2bcdd8f2 | 605 | * Returns the mapped MSI ID. |
a251b263 | 606 | */ |
2bcdd8f2 | 607 | u32 of_msi_map_id(struct device *dev, struct device_node *msi_np, u32 id_in) |
a251b263 | 608 | { |
2bcdd8f2 | 609 | return __of_msi_map_id(dev, &msi_np, id_in); |
a251b263 MZ |
610 | } |
611 | ||
82b9b424 MZ |
612 | /** |
613 | * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain | |
614 | * @dev: device for which the mapping is to be done. | |
2bcdd8f2 | 615 | * @id: Device ID. |
6f881aba | 616 | * @bus_token: Bus token |
82b9b424 MZ |
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 | */ | |
6f881aba DC |
623 | struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 id, |
624 | u32 bus_token) | |
82b9b424 MZ |
625 | { |
626 | struct device_node *np = NULL; | |
627 | ||
2bcdd8f2 | 628 | __of_msi_map_id(dev, &np, id); |
6f881aba | 629 | return irq_find_matching_host(np, bus_token); |
82b9b424 MZ |
630 | } |
631 | ||
48ae34fb MZ |
632 | /** |
633 | * of_msi_get_domain - Use msi-parent to find the relevant MSI domain | |
634 | * @dev: device for which the domain is requested | |
635 | * @np: device node for @dev | |
636 | * @token: bus type for this domain | |
637 | * | |
638 | * Parse the msi-parent property (both the simple and the complex | |
639 | * versions), and returns the corresponding MSI domain. | |
640 | * | |
641 | * Returns: the MSI domain for this device (or NULL on failure). | |
642 | */ | |
643 | struct irq_domain *of_msi_get_domain(struct device *dev, | |
644 | struct device_node *np, | |
645 | enum irq_domain_bus_token token) | |
646 | { | |
647 | struct device_node *msi_np; | |
648 | struct irq_domain *d; | |
649 | ||
650 | /* Check for a single msi-parent property */ | |
651 | msi_np = of_parse_phandle(np, "msi-parent", 0); | |
652 | if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) { | |
14a0db3c | 653 | d = irq_find_matching_host(msi_np, token); |
48ae34fb MZ |
654 | if (!d) |
655 | of_node_put(msi_np); | |
656 | return d; | |
657 | } | |
658 | ||
659 | if (token == DOMAIN_BUS_PLATFORM_MSI) { | |
660 | /* Check for the complex msi-parent version */ | |
661 | struct of_phandle_args args; | |
662 | int index = 0; | |
663 | ||
664 | while (!of_parse_phandle_with_args(np, "msi-parent", | |
665 | "#msi-cells", | |
666 | index, &args)) { | |
14a0db3c | 667 | d = irq_find_matching_host(args.np, token); |
48ae34fb MZ |
668 | if (d) |
669 | return d; | |
670 | ||
671 | of_node_put(args.np); | |
672 | index++; | |
673 | } | |
674 | } | |
675 | ||
676 | return NULL; | |
677 | } | |
61c08240 MZ |
678 | |
679 | /** | |
680 | * of_msi_configure - Set the msi_domain field of a device | |
681 | * @dev: device structure to associate with an MSI irq domain | |
682 | * @np: device node for that device | |
683 | */ | |
684 | void of_msi_configure(struct device *dev, struct device_node *np) | |
685 | { | |
686 | dev_set_msi_domain(dev, | |
687 | of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI)); | |
688 | } | |
5282c181 | 689 | EXPORT_SYMBOL_GPL(of_msi_configure); |