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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> | |
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 | * | |
8c8239c2 | 51 | * Return: A pointer to the interrupt parent node, or NULL if the interrupt |
7dc2e113 GL |
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 | 83 | * |
7dc2e113 GL |
84 | * This function is a low-level interrupt tree walking function. It |
85 | * can be used to do a partial walk with synthetized reg and interrupts | |
86 | * properties, for example when resolving PCI interrupts when no device | |
23616132 GL |
87 | * node exist for the parent. It takes an interrupt specifier structure as |
88 | * input, walks the tree looking for any interrupt-map properties, translates | |
89 | * the specifier for each map, and then returns the translated map. | |
8c8239c2 RH |
90 | * |
91 | * Return: 0 on success and a negative number on error | |
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) { | |
04128418 MZ |
159 | /* |
160 | * Now check if cursor is an interrupt-controller and | |
161 | * if it is then we are done, unless there is an | |
162 | * interrupt-map which takes precedence. | |
7dc2e113 | 163 | */ |
04128418 MZ |
164 | imap = of_get_property(ipar, "interrupt-map", &imaplen); |
165 | if (imap == NULL && | |
166 | of_property_read_bool(ipar, "interrupt-controller")) { | |
7dc2e113 | 167 | pr_debug(" -> got it !\n"); |
7dc2e113 GL |
168 | return 0; |
169 | } | |
170 | ||
78119fd1 GL |
171 | /* |
172 | * interrupt-map parsing does not work without a reg | |
173 | * property when #address-cells != 0 | |
174 | */ | |
175 | if (addrsize && !addr) { | |
176 | pr_debug(" -> no reg passed in when needed !\n"); | |
177 | goto fail; | |
178 | } | |
179 | ||
7dc2e113 GL |
180 | /* No interrupt map, check for an interrupt parent */ |
181 | if (imap == NULL) { | |
182 | pr_debug(" -> no map, getting parent\n"); | |
183 | newpar = of_irq_find_parent(ipar); | |
184 | goto skiplevel; | |
185 | } | |
186 | imaplen /= sizeof(u32); | |
187 | ||
188 | /* Look for a mask */ | |
189 | imask = of_get_property(ipar, "interrupt-map-mask", NULL); | |
23616132 GL |
190 | if (!imask) |
191 | imask = dummy_imask; | |
7dc2e113 GL |
192 | |
193 | /* Parse interrupt-map */ | |
194 | match = 0; | |
195 | while (imaplen > (addrsize + intsize + 1) && !match) { | |
196 | /* Compare specifiers */ | |
197 | match = 1; | |
23616132 | 198 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
74dac2ed | 199 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
7dc2e113 GL |
200 | |
201 | pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen); | |
202 | ||
203 | /* Get the interrupt parent */ | |
204 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) | |
205 | newpar = of_node_get(of_irq_dflt_pic); | |
206 | else | |
9a6b2e58 | 207 | newpar = of_find_node_by_phandle(be32_to_cpup(imap)); |
7dc2e113 GL |
208 | imap++; |
209 | --imaplen; | |
210 | ||
211 | /* Check if not found */ | |
212 | if (newpar == NULL) { | |
213 | pr_debug(" -> imap parent not found !\n"); | |
214 | goto fail; | |
215 | } | |
216 | ||
1ca56e7d PC |
217 | if (!of_device_is_available(newpar)) |
218 | match = 0; | |
219 | ||
7dc2e113 GL |
220 | /* Get #interrupt-cells and #address-cells of new |
221 | * parent | |
222 | */ | |
fa976ff7 SS |
223 | if (of_property_read_u32(newpar, "#interrupt-cells", |
224 | &newintsize)) { | |
7dc2e113 GL |
225 | pr_debug(" -> parent lacks #interrupt-cells!\n"); |
226 | goto fail; | |
227 | } | |
fa976ff7 SS |
228 | if (of_property_read_u32(newpar, "#address-cells", |
229 | &newaddrsize)) | |
230 | newaddrsize = 0; | |
7dc2e113 GL |
231 | |
232 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n", | |
233 | newintsize, newaddrsize); | |
234 | ||
235 | /* Check for malformed properties */ | |
f1aa5484 GP |
236 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS) |
237 | || (imaplen < (newaddrsize + newintsize))) { | |
238 | rc = -EFAULT; | |
7dc2e113 | 239 | goto fail; |
f1aa5484 | 240 | } |
7dc2e113 GL |
241 | |
242 | imap += newaddrsize + newintsize; | |
243 | imaplen -= newaddrsize + newintsize; | |
244 | ||
245 | pr_debug(" -> imaplen=%d\n", imaplen); | |
246 | } | |
247 | if (!match) | |
248 | goto fail; | |
249 | ||
23616132 GL |
250 | /* |
251 | * Successfully parsed an interrrupt-map translation; copy new | |
252 | * interrupt specifier into the out_irq structure | |
253 | */ | |
23616132 GL |
254 | match_array = imap - newaddrsize - newintsize; |
255 | for (i = 0; i < newintsize; i++) | |
256 | out_irq->args[i] = be32_to_cpup(imap - newintsize + i); | |
257 | out_irq->args_count = intsize = newintsize; | |
7dc2e113 | 258 | addrsize = newaddrsize; |
7dc2e113 | 259 | |
04128418 MZ |
260 | if (ipar == newpar) { |
261 | pr_debug("%pOF interrupt-map entry to self\n", ipar); | |
262 | return 0; | |
263 | } | |
264 | ||
7dc2e113 GL |
265 | skiplevel: |
266 | /* Iterate again with new parent */ | |
d23b2516 | 267 | out_irq->np = newpar; |
0d638a07 | 268 | pr_debug(" -> new parent: %pOF\n", newpar); |
7dc2e113 GL |
269 | of_node_put(ipar); |
270 | ipar = newpar; | |
271 | newpar = NULL; | |
272 | } | |
f1aa5484 GP |
273 | rc = -ENOENT; /* No interrupt-map found */ |
274 | ||
7dc2e113 GL |
275 | fail: |
276 | of_node_put(ipar); | |
7dc2e113 GL |
277 | of_node_put(newpar); |
278 | ||
f1aa5484 | 279 | return rc; |
7dc2e113 | 280 | } |
0c02c800 | 281 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
7dc2e113 GL |
282 | |
283 | /** | |
0c02c800 | 284 | * of_irq_parse_one - Resolve an interrupt for a device |
7dc2e113 GL |
285 | * @device: the device whose interrupt is to be resolved |
286 | * @index: index of the interrupt to resolve | |
83f82d7a | 287 | * @out_irq: structure of_phandle_args filled by this function |
7dc2e113 | 288 | * |
23616132 GL |
289 | * This function resolves an interrupt for a node by walking the interrupt tree, |
290 | * finding which interrupt controller node it is attached to, and returning the | |
291 | * interrupt specifier that can be used to retrieve a Linux IRQ number. | |
7dc2e113 | 292 | */ |
530210c7 | 293 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
7dc2e113 GL |
294 | { |
295 | struct device_node *p; | |
b47fe22d RH |
296 | const __be32 *addr; |
297 | u32 intsize; | |
d7c14605 | 298 | int i, res; |
7dc2e113 | 299 | |
0d638a07 | 300 | pr_debug("of_irq_parse_one: dev=%pOF, index=%d\n", device, index); |
7dc2e113 GL |
301 | |
302 | /* OldWorld mac stuff is "special", handle out of line */ | |
303 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) | |
0c02c800 | 304 | return of_irq_parse_oldworld(device, index, out_irq); |
7dc2e113 | 305 | |
79d97015 GL |
306 | /* Get the reg property (if any) */ |
307 | addr = of_get_property(device, "reg", NULL); | |
308 | ||
a9ecdc0f FF |
309 | /* Try the new-style interrupts-extended first */ |
310 | res = of_parse_phandle_with_args(device, "interrupts-extended", | |
311 | "#interrupt-cells", index, out_irq); | |
312 | if (!res) | |
313 | return of_irq_parse_raw(addr, out_irq); | |
314 | ||
7dc2e113 GL |
315 | /* Look for the interrupt parent. */ |
316 | p = of_irq_find_parent(device); | |
317 | if (p == NULL) | |
318 | return -EINVAL; | |
319 | ||
320 | /* Get size of interrupt specifier */ | |
fa976ff7 | 321 | if (of_property_read_u32(p, "#interrupt-cells", &intsize)) { |
d7c14605 | 322 | res = -EINVAL; |
7dc2e113 | 323 | goto out; |
d7c14605 | 324 | } |
7dc2e113 | 325 | |
b47fe22d | 326 | pr_debug(" parent=%pOF, intsize=%d\n", p, intsize); |
7dc2e113 | 327 | |
23616132 | 328 | /* Copy intspec into irq structure */ |
23616132 GL |
329 | out_irq->np = p; |
330 | out_irq->args_count = intsize; | |
b47fe22d RH |
331 | for (i = 0; i < intsize; i++) { |
332 | res = of_property_read_u32_index(device, "interrupts", | |
333 | (index * intsize) + i, | |
334 | out_irq->args + i); | |
335 | if (res) | |
336 | goto out; | |
337 | } | |
338 | ||
339 | pr_debug(" intspec=%d\n", *out_irq->args); | |
340 | ||
23616132 GL |
341 | |
342 | /* Check if there are any interrupt-map translations to process */ | |
343 | res = of_irq_parse_raw(addr, out_irq); | |
7dc2e113 GL |
344 | out: |
345 | of_node_put(p); | |
346 | return res; | |
347 | } | |
0c02c800 | 348 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
7dc2e113 GL |
349 | |
350 | /** | |
351 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource | |
352 | * @dev: pointer to device tree node | |
353 | * @index: zero-based index of the irq | |
354 | * @r: pointer to resource structure to return result into. | |
355 | */ | |
356 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) | |
357 | { | |
7a4228bb TP |
358 | int irq = of_irq_get(dev, index); |
359 | ||
360 | if (irq < 0) | |
361 | return irq; | |
7dc2e113 GL |
362 | |
363 | /* Only dereference the resource if both the | |
364 | * resource and the irq are valid. */ | |
77a7300a | 365 | if (r && irq) { |
661db794 BC |
366 | const char *name = NULL; |
367 | ||
cf9e2368 | 368 | memset(r, 0, sizeof(*r)); |
661db794 | 369 | /* |
ae107d06 | 370 | * Get optional "interrupt-names" property to add a name |
661db794 BC |
371 | * to the resource. |
372 | */ | |
373 | of_property_read_string_index(dev, "interrupt-names", index, | |
374 | &name); | |
375 | ||
7dc2e113 | 376 | r->start = r->end = irq; |
4a43d686 | 377 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq)); |
8804827b | 378 | r->name = name ? name : of_node_full_name(dev); |
7dc2e113 GL |
379 | } |
380 | ||
381 | return irq; | |
382 | } | |
383 | EXPORT_SYMBOL_GPL(of_irq_to_resource); | |
52f6537c | 384 | |
9ec36caf | 385 | /** |
39935466 | 386 | * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number |
9ec36caf | 387 | * @dev: pointer to device tree node |
39935466 | 388 | * @index: zero-based index of the IRQ |
9ec36caf | 389 | * |
8c8239c2 | 390 | * Return: Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
39935466 SS |
391 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case |
392 | * of any other failure. | |
9ec36caf RH |
393 | */ |
394 | int of_irq_get(struct device_node *dev, int index) | |
395 | { | |
396 | int rc; | |
397 | struct of_phandle_args oirq; | |
398 | struct irq_domain *domain; | |
399 | ||
400 | rc = of_irq_parse_one(dev, index, &oirq); | |
401 | if (rc) | |
402 | return rc; | |
403 | ||
404 | domain = irq_find_host(oirq.np); | |
405 | if (!domain) | |
406 | return -EPROBE_DEFER; | |
407 | ||
408 | return irq_create_of_mapping(&oirq); | |
409 | } | |
9eb08fb3 | 410 | EXPORT_SYMBOL_GPL(of_irq_get); |
9ec36caf | 411 | |
ad69674e | 412 | /** |
39935466 | 413 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number |
ad69674e | 414 | * @dev: pointer to device tree node |
39935466 | 415 | * @name: IRQ name |
ad69674e | 416 | * |
8c8239c2 | 417 | * Return: Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
39935466 SS |
418 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case |
419 | * of any other failure. | |
ad69674e GS |
420 | */ |
421 | int of_irq_get_byname(struct device_node *dev, const char *name) | |
422 | { | |
423 | int index; | |
424 | ||
425 | if (unlikely(!name)) | |
426 | return -EINVAL; | |
427 | ||
428 | index = of_property_match_string(dev, "interrupt-names", name); | |
429 | if (index < 0) | |
430 | return index; | |
431 | ||
432 | return of_irq_get(dev, index); | |
433 | } | |
6602c452 | 434 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
ad69674e | 435 | |
52f6537c AS |
436 | /** |
437 | * of_irq_count - Count the number of IRQs a node uses | |
438 | * @dev: pointer to device tree node | |
439 | */ | |
440 | int of_irq_count(struct device_node *dev) | |
441 | { | |
3da52787 | 442 | struct of_phandle_args irq; |
52f6537c AS |
443 | int nr = 0; |
444 | ||
3da52787 | 445 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
52f6537c AS |
446 | nr++; |
447 | ||
448 | return nr; | |
449 | } | |
450 | ||
451 | /** | |
452 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info | |
453 | * @dev: pointer to device tree node | |
454 | * @res: array of resources to fill in | |
455 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) | |
456 | * | |
8c8239c2 | 457 | * Return: The size of the filled in table (up to @nr_irqs). |
52f6537c AS |
458 | */ |
459 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, | |
460 | int nr_irqs) | |
461 | { | |
462 | int i; | |
463 | ||
464 | for (i = 0; i < nr_irqs; i++, res++) | |
531da740 | 465 | if (of_irq_to_resource(dev, i, res) <= 0) |
52f6537c AS |
466 | break; |
467 | ||
468 | return i; | |
469 | } | |
a4f8bf22 | 470 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
c71a54b0 | 471 | |
48a9b733 | 472 | struct of_intc_desc { |
c71a54b0 | 473 | struct list_head list; |
264041e3 | 474 | of_irq_init_cb_t irq_init_cb; |
c71a54b0 RH |
475 | struct device_node *dev; |
476 | struct device_node *interrupt_parent; | |
477 | }; | |
478 | ||
479 | /** | |
480 | * of_irq_init - Scan and init matching interrupt controllers in DT | |
481 | * @matches: 0 terminated array of nodes to match and init function to call | |
482 | * | |
483 | * This function scans the device tree for matching interrupt controller nodes, | |
484 | * and calls their initialization functions in order with parents first. | |
485 | */ | |
486 | void __init of_irq_init(const struct of_device_id *matches) | |
487 | { | |
264041e3 | 488 | const struct of_device_id *match; |
c71a54b0 | 489 | struct device_node *np, *parent = NULL; |
48a9b733 | 490 | struct of_intc_desc *desc, *temp_desc; |
c71a54b0 RH |
491 | struct list_head intc_desc_list, intc_parent_list; |
492 | ||
493 | INIT_LIST_HEAD(&intc_desc_list); | |
494 | INIT_LIST_HEAD(&intc_parent_list); | |
495 | ||
264041e3 | 496 | for_each_matching_node_and_match(np, matches, &match) { |
6a245d95 | 497 | if (!of_property_read_bool(np, "interrupt-controller") || |
bf49be02 | 498 | !of_device_is_available(np)) |
c71a54b0 | 499 | continue; |
264041e3 MY |
500 | |
501 | if (WARN(!match->data, "of_irq_init: no init function for %s\n", | |
502 | match->compatible)) | |
503 | continue; | |
504 | ||
c71a54b0 | 505 | /* |
48a9b733 | 506 | * Here, we allocate and populate an of_intc_desc with the node |
c71a54b0 RH |
507 | * pointer, interrupt-parent device_node etc. |
508 | */ | |
509 | desc = kzalloc(sizeof(*desc), GFP_KERNEL); | |
6f7dc9a3 | 510 | if (!desc) { |
8363ccb9 | 511 | of_node_put(np); |
c71a54b0 | 512 | goto err; |
8363ccb9 | 513 | } |
c71a54b0 | 514 | |
264041e3 | 515 | desc->irq_init_cb = match->data; |
8363ccb9 | 516 | desc->dev = of_node_get(np); |
c71a54b0 | 517 | desc->interrupt_parent = of_irq_find_parent(np); |
d7fb6d0a RH |
518 | if (desc->interrupt_parent == np) |
519 | desc->interrupt_parent = NULL; | |
c71a54b0 RH |
520 | list_add_tail(&desc->list, &intc_desc_list); |
521 | } | |
522 | ||
523 | /* | |
524 | * The root irq controller is the one without an interrupt-parent. | |
525 | * That one goes first, followed by the controllers that reference it, | |
526 | * followed by the ones that reference the 2nd level controllers, etc. | |
527 | */ | |
528 | while (!list_empty(&intc_desc_list)) { | |
529 | /* | |
530 | * Process all controllers with the current 'parent'. | |
531 | * First pass will be looking for NULL as the parent. | |
532 | * The assumption is that NULL parent means a root controller. | |
533 | */ | |
534 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
c71a54b0 | 535 | int ret; |
c71a54b0 RH |
536 | |
537 | if (desc->interrupt_parent != parent) | |
538 | continue; | |
539 | ||
540 | list_del(&desc->list); | |
c71a54b0 | 541 | |
e55aeb6b PZ |
542 | of_node_set_flag(desc->dev, OF_POPULATED); |
543 | ||
0d638a07 RH |
544 | pr_debug("of_irq_init: init %pOF (%p), parent %p\n", |
545 | desc->dev, | |
c71a54b0 | 546 | desc->dev, desc->interrupt_parent); |
264041e3 MY |
547 | ret = desc->irq_init_cb(desc->dev, |
548 | desc->interrupt_parent); | |
c71a54b0 | 549 | if (ret) { |
e55aeb6b | 550 | of_node_clear_flag(desc->dev, OF_POPULATED); |
c71a54b0 RH |
551 | kfree(desc); |
552 | continue; | |
553 | } | |
554 | ||
555 | /* | |
556 | * This one is now set up; add it to the parent list so | |
557 | * its children can get processed in a subsequent pass. | |
558 | */ | |
559 | list_add_tail(&desc->list, &intc_parent_list); | |
560 | } | |
561 | ||
562 | /* Get the next pending parent that might have children */ | |
c0cdfaa0 AL |
563 | desc = list_first_entry_or_null(&intc_parent_list, |
564 | typeof(*desc), list); | |
565 | if (!desc) { | |
c71a54b0 RH |
566 | pr_err("of_irq_init: children remain, but no parents\n"); |
567 | break; | |
568 | } | |
569 | list_del(&desc->list); | |
570 | parent = desc->dev; | |
571 | kfree(desc); | |
572 | } | |
573 | ||
574 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { | |
575 | list_del(&desc->list); | |
576 | kfree(desc); | |
577 | } | |
578 | err: | |
579 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { | |
580 | list_del(&desc->list); | |
8363ccb9 | 581 | of_node_put(desc->dev); |
c71a54b0 RH |
582 | kfree(desc); |
583 | } | |
584 | } | |
c706c239 | 585 | |
2bcdd8f2 LP |
586 | static u32 __of_msi_map_id(struct device *dev, struct device_node **np, |
587 | u32 id_in) | |
8db02d8b DD |
588 | { |
589 | struct device *parent_dev; | |
2bcdd8f2 | 590 | u32 id_out = id_in; |
8db02d8b DD |
591 | |
592 | /* | |
593 | * Walk up the device parent links looking for one with a | |
594 | * "msi-map" property. | |
595 | */ | |
987068fc | 596 | for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) |
2bcdd8f2 LP |
597 | if (!of_map_id(parent_dev->of_node, id_in, "msi-map", |
598 | "msi-map-mask", np, &id_out)) | |
a251b263 | 599 | break; |
2bcdd8f2 | 600 | return id_out; |
8db02d8b | 601 | } |
48ae34fb | 602 | |
a251b263 | 603 | /** |
2bcdd8f2 | 604 | * of_msi_map_id - Map a MSI ID for a device. |
a251b263 MZ |
605 | * @dev: device for which the mapping is to be done. |
606 | * @msi_np: device node of the expected msi controller. | |
2bcdd8f2 | 607 | * @id_in: unmapped MSI ID for the device. |
a251b263 MZ |
608 | * |
609 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
2bcdd8f2 | 610 | * property. If found, apply the mapping to @id_in. |
a251b263 | 611 | * |
8c8239c2 | 612 | * Return: The mapped MSI ID. |
a251b263 | 613 | */ |
2bcdd8f2 | 614 | u32 of_msi_map_id(struct device *dev, struct device_node *msi_np, u32 id_in) |
a251b263 | 615 | { |
2bcdd8f2 | 616 | return __of_msi_map_id(dev, &msi_np, id_in); |
a251b263 MZ |
617 | } |
618 | ||
82b9b424 MZ |
619 | /** |
620 | * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain | |
621 | * @dev: device for which the mapping is to be done. | |
2bcdd8f2 | 622 | * @id: Device ID. |
6f881aba | 623 | * @bus_token: Bus token |
82b9b424 MZ |
624 | * |
625 | * Walk up the device hierarchy looking for devices with a "msi-map" | |
626 | * property. | |
627 | * | |
628 | * Returns: the MSI domain for this device (or NULL on failure) | |
629 | */ | |
6f881aba DC |
630 | struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 id, |
631 | u32 bus_token) | |
82b9b424 MZ |
632 | { |
633 | struct device_node *np = NULL; | |
634 | ||
2bcdd8f2 | 635 | __of_msi_map_id(dev, &np, id); |
6f881aba | 636 | return irq_find_matching_host(np, bus_token); |
82b9b424 MZ |
637 | } |
638 | ||
48ae34fb MZ |
639 | /** |
640 | * of_msi_get_domain - Use msi-parent to find the relevant MSI domain | |
641 | * @dev: device for which the domain is requested | |
642 | * @np: device node for @dev | |
643 | * @token: bus type for this domain | |
644 | * | |
645 | * Parse the msi-parent property (both the simple and the complex | |
646 | * versions), and returns the corresponding MSI domain. | |
647 | * | |
648 | * Returns: the MSI domain for this device (or NULL on failure). | |
649 | */ | |
650 | struct irq_domain *of_msi_get_domain(struct device *dev, | |
651 | struct device_node *np, | |
652 | enum irq_domain_bus_token token) | |
653 | { | |
654 | struct device_node *msi_np; | |
655 | struct irq_domain *d; | |
656 | ||
657 | /* Check for a single msi-parent property */ | |
658 | msi_np = of_parse_phandle(np, "msi-parent", 0); | |
659 | if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) { | |
14a0db3c | 660 | d = irq_find_matching_host(msi_np, token); |
48ae34fb MZ |
661 | if (!d) |
662 | of_node_put(msi_np); | |
663 | return d; | |
664 | } | |
665 | ||
666 | if (token == DOMAIN_BUS_PLATFORM_MSI) { | |
667 | /* Check for the complex msi-parent version */ | |
668 | struct of_phandle_args args; | |
669 | int index = 0; | |
670 | ||
671 | while (!of_parse_phandle_with_args(np, "msi-parent", | |
672 | "#msi-cells", | |
673 | index, &args)) { | |
14a0db3c | 674 | d = irq_find_matching_host(args.np, token); |
48ae34fb MZ |
675 | if (d) |
676 | return d; | |
677 | ||
678 | of_node_put(args.np); | |
679 | index++; | |
680 | } | |
681 | } | |
682 | ||
683 | return NULL; | |
684 | } | |
61c08240 MZ |
685 | |
686 | /** | |
687 | * of_msi_configure - Set the msi_domain field of a device | |
688 | * @dev: device structure to associate with an MSI irq domain | |
689 | * @np: device node for that device | |
690 | */ | |
691 | void of_msi_configure(struct device *dev, struct device_node *np) | |
692 | { | |
693 | dev_set_msi_domain(dev, | |
694 | of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI)); | |
695 | } | |
5282c181 | 696 | EXPORT_SYMBOL_GPL(of_msi_configure); |