1 | // SPDX-License-Identifier: GPL-2.0+ |
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 | * |
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 | |
17 | #define pr_fmt(fmt) "OF: " fmt |
18 | |
19 | #include <linux/device.h> |
20 | #include <linux/errno.h> |
21 | #include <linux/list.h> |
22 | #include <linux/module.h> |
23 | #include <linux/of.h> |
24 | #include <linux/of_irq.h> |
25 | #include <linux/string.h> |
26 | #include <linux/slab.h> |
27 | |
28 | /** |
29 | * irq_of_parse_and_map - Parse and map an interrupt into linux virq space |
30 | * @dev: Device node of the device whose interrupt is to be mapped |
31 | * @index: Index of the interrupt to map |
32 | * |
33 | * This function is a wrapper that chains of_irq_parse_one() and |
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 | { |
38 | struct of_phandle_args oirq; |
39 | |
40 | if (of_irq_parse_one(device: dev, index, out_irq: &oirq)) |
41 | return 0; |
42 | |
43 | return irq_create_of_mapping(irq_data: &oirq); |
44 | } |
45 | EXPORT_SYMBOL_GPL(irq_of_parse_and_map); |
46 | |
47 | /** |
48 | * of_irq_find_parent - Given a device node, find its interrupt parent node |
49 | * @child: pointer to device node |
50 | * |
51 | * Return: A pointer to the interrupt parent node, or NULL if the interrupt |
52 | * parent could not be determined. |
53 | */ |
54 | struct device_node *of_irq_find_parent(struct device_node *child) |
55 | { |
56 | struct device_node *p; |
57 | phandle parent; |
58 | |
59 | if (!of_node_get(node: child)) |
60 | return NULL; |
61 | |
62 | do { |
63 | if (of_property_read_u32(np: child, propname: "interrupt-parent" , out_value: &parent)) { |
64 | p = of_get_parent(node: child); |
65 | } else { |
66 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) |
67 | p = of_node_get(of_irq_dflt_pic); |
68 | else |
69 | p = of_find_node_by_phandle(handle: parent); |
70 | } |
71 | of_node_put(node: child); |
72 | child = p; |
73 | } while (p && of_get_property(node: p, name: "#interrupt-cells" , NULL) == NULL); |
74 | |
75 | return p; |
76 | } |
77 | EXPORT_SYMBOL_GPL(of_irq_find_parent); |
78 | |
79 | /* |
80 | * These interrupt controllers abuse interrupt-map for unspeakable |
81 | * reasons and rely on the core code to *ignore* it (the drivers do |
82 | * their own parsing of the property). |
83 | * |
84 | * If you think of adding to the list for something *new*, think |
85 | * again. There is a high chance that you will be sent back to the |
86 | * drawing board. |
87 | */ |
88 | static const char * const of_irq_imap_abusers[] = { |
89 | "CBEA,platform-spider-pic" , |
90 | "sti,platform-spider-pic" , |
91 | "realtek,rtl-intc" , |
92 | "fsl,ls1021a-extirq" , |
93 | "fsl,ls1043a-extirq" , |
94 | "fsl,ls1088a-extirq" , |
95 | "renesas,rza1-irqc" , |
96 | NULL, |
97 | }; |
98 | |
99 | /** |
100 | * of_irq_parse_raw - Low level interrupt tree parsing |
101 | * @addr: address specifier (start of "reg" property of the device) in be32 format |
102 | * @out_irq: structure of_phandle_args updated by this function |
103 | * |
104 | * This function is a low-level interrupt tree walking function. It |
105 | * can be used to do a partial walk with synthetized reg and interrupts |
106 | * properties, for example when resolving PCI interrupts when no device |
107 | * node exist for the parent. It takes an interrupt specifier structure as |
108 | * input, walks the tree looking for any interrupt-map properties, translates |
109 | * the specifier for each map, and then returns the translated map. |
110 | * |
111 | * Return: 0 on success and a negative number on error |
112 | */ |
113 | int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq) |
114 | { |
115 | struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL; |
116 | __be32 initial_match_array[MAX_PHANDLE_ARGS]; |
117 | const __be32 *match_array = initial_match_array; |
118 | const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = cpu_to_be32(~0) }; |
119 | u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0; |
120 | int imaplen, match, i, rc = -EINVAL; |
121 | |
122 | #ifdef DEBUG |
123 | of_print_phandle_args("of_irq_parse_raw: " , out_irq); |
124 | #endif |
125 | |
126 | ipar = of_node_get(node: out_irq->np); |
127 | |
128 | /* First get the #interrupt-cells property of the current cursor |
129 | * that tells us how to interpret the passed-in intspec. If there |
130 | * is none, we are nice and just walk up the tree |
131 | */ |
132 | do { |
133 | if (!of_property_read_u32(np: ipar, propname: "#interrupt-cells" , out_value: &intsize)) |
134 | break; |
135 | tnode = ipar; |
136 | ipar = of_irq_find_parent(ipar); |
137 | of_node_put(node: tnode); |
138 | } while (ipar); |
139 | if (ipar == NULL) { |
140 | pr_debug(" -> no parent found !\n" ); |
141 | goto fail; |
142 | } |
143 | |
144 | pr_debug("of_irq_parse_raw: ipar=%pOF, size=%d\n" , ipar, intsize); |
145 | |
146 | if (out_irq->args_count != intsize) |
147 | goto fail; |
148 | |
149 | /* Look for this #address-cells. We have to implement the old linux |
150 | * trick of looking for the parent here as some device-trees rely on it |
151 | */ |
152 | old = of_node_get(node: ipar); |
153 | do { |
154 | tmp = of_get_property(node: old, name: "#address-cells" , NULL); |
155 | tnode = of_get_parent(node: old); |
156 | of_node_put(node: old); |
157 | old = tnode; |
158 | } while (old && tmp == NULL); |
159 | of_node_put(node: old); |
160 | old = NULL; |
161 | addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp); |
162 | |
163 | pr_debug(" -> addrsize=%d\n" , addrsize); |
164 | |
165 | /* Range check so that the temporary buffer doesn't overflow */ |
166 | if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS)) { |
167 | rc = -EFAULT; |
168 | goto fail; |
169 | } |
170 | |
171 | /* Precalculate the match array - this simplifies match loop */ |
172 | for (i = 0; i < addrsize; i++) |
173 | initial_match_array[i] = addr ? addr[i] : 0; |
174 | for (i = 0; i < intsize; i++) |
175 | initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]); |
176 | |
177 | /* Now start the actual "proper" walk of the interrupt tree */ |
178 | while (ipar != NULL) { |
179 | /* |
180 | * Now check if cursor is an interrupt-controller and |
181 | * if it is then we are done, unless there is an |
182 | * interrupt-map which takes precedence except on one |
183 | * of these broken platforms that want to parse |
184 | * interrupt-map themselves for $reason. |
185 | */ |
186 | bool intc = of_property_read_bool(np: ipar, propname: "interrupt-controller" ); |
187 | |
188 | imap = of_get_property(node: ipar, name: "interrupt-map" , lenp: &imaplen); |
189 | if (intc && |
190 | (!imap || of_device_compatible_match(device: ipar, compat: of_irq_imap_abusers))) { |
191 | pr_debug(" -> got it !\n" ); |
192 | return 0; |
193 | } |
194 | |
195 | /* |
196 | * interrupt-map parsing does not work without a reg |
197 | * property when #address-cells != 0 |
198 | */ |
199 | if (addrsize && !addr) { |
200 | pr_debug(" -> no reg passed in when needed !\n" ); |
201 | goto fail; |
202 | } |
203 | |
204 | /* No interrupt map, check for an interrupt parent */ |
205 | if (imap == NULL) { |
206 | pr_debug(" -> no map, getting parent\n" ); |
207 | newpar = of_irq_find_parent(ipar); |
208 | goto skiplevel; |
209 | } |
210 | imaplen /= sizeof(u32); |
211 | |
212 | /* Look for a mask */ |
213 | imask = of_get_property(node: ipar, name: "interrupt-map-mask" , NULL); |
214 | if (!imask) |
215 | imask = dummy_imask; |
216 | |
217 | /* Parse interrupt-map */ |
218 | match = 0; |
219 | while (imaplen > (addrsize + intsize + 1) && !match) { |
220 | /* Compare specifiers */ |
221 | match = 1; |
222 | for (i = 0; i < (addrsize + intsize); i++, imaplen--) |
223 | match &= !((match_array[i] ^ *imap++) & imask[i]); |
224 | |
225 | pr_debug(" -> match=%d (imaplen=%d)\n" , match, imaplen); |
226 | |
227 | /* Get the interrupt parent */ |
228 | if (of_irq_workarounds & OF_IMAP_NO_PHANDLE) |
229 | newpar = of_node_get(of_irq_dflt_pic); |
230 | else |
231 | newpar = of_find_node_by_phandle(be32_to_cpup(p: imap)); |
232 | imap++; |
233 | --imaplen; |
234 | |
235 | /* Check if not found */ |
236 | if (newpar == NULL) { |
237 | pr_debug(" -> imap parent not found !\n" ); |
238 | goto fail; |
239 | } |
240 | |
241 | if (!of_device_is_available(device: newpar)) |
242 | match = 0; |
243 | |
244 | /* Get #interrupt-cells and #address-cells of new |
245 | * parent |
246 | */ |
247 | if (of_property_read_u32(np: newpar, propname: "#interrupt-cells" , |
248 | out_value: &newintsize)) { |
249 | pr_debug(" -> parent lacks #interrupt-cells!\n" ); |
250 | goto fail; |
251 | } |
252 | if (of_property_read_u32(np: newpar, propname: "#address-cells" , |
253 | out_value: &newaddrsize)) |
254 | newaddrsize = 0; |
255 | |
256 | pr_debug(" -> newintsize=%d, newaddrsize=%d\n" , |
257 | newintsize, newaddrsize); |
258 | |
259 | /* Check for malformed properties */ |
260 | if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS) |
261 | || (imaplen < (newaddrsize + newintsize))) { |
262 | rc = -EFAULT; |
263 | goto fail; |
264 | } |
265 | |
266 | imap += newaddrsize + newintsize; |
267 | imaplen -= newaddrsize + newintsize; |
268 | |
269 | pr_debug(" -> imaplen=%d\n" , imaplen); |
270 | } |
271 | if (!match) { |
272 | if (intc) { |
273 | /* |
274 | * The PASEMI Nemo is a known offender, so |
275 | * let's only warn for anyone else. |
276 | */ |
277 | WARN(!IS_ENABLED(CONFIG_PPC_PASEMI), |
278 | "%pOF interrupt-map failed, using interrupt-controller\n" , |
279 | ipar); |
280 | return 0; |
281 | } |
282 | |
283 | goto fail; |
284 | } |
285 | |
286 | /* |
287 | * Successfully parsed an interrupt-map translation; copy new |
288 | * interrupt specifier into the out_irq structure |
289 | */ |
290 | match_array = imap - newaddrsize - newintsize; |
291 | for (i = 0; i < newintsize; i++) |
292 | out_irq->args[i] = be32_to_cpup(p: imap - newintsize + i); |
293 | out_irq->args_count = intsize = newintsize; |
294 | addrsize = newaddrsize; |
295 | |
296 | if (ipar == newpar) { |
297 | pr_debug("%pOF interrupt-map entry to self\n" , ipar); |
298 | return 0; |
299 | } |
300 | |
301 | skiplevel: |
302 | /* Iterate again with new parent */ |
303 | out_irq->np = newpar; |
304 | pr_debug(" -> new parent: %pOF\n" , newpar); |
305 | of_node_put(node: ipar); |
306 | ipar = newpar; |
307 | newpar = NULL; |
308 | } |
309 | rc = -ENOENT; /* No interrupt-map found */ |
310 | |
311 | fail: |
312 | of_node_put(node: ipar); |
313 | of_node_put(node: newpar); |
314 | |
315 | return rc; |
316 | } |
317 | EXPORT_SYMBOL_GPL(of_irq_parse_raw); |
318 | |
319 | /** |
320 | * of_irq_parse_one - Resolve an interrupt for a device |
321 | * @device: the device whose interrupt is to be resolved |
322 | * @index: index of the interrupt to resolve |
323 | * @out_irq: structure of_phandle_args filled by this function |
324 | * |
325 | * This function resolves an interrupt for a node by walking the interrupt tree, |
326 | * finding which interrupt controller node it is attached to, and returning the |
327 | * interrupt specifier that can be used to retrieve a Linux IRQ number. |
328 | */ |
329 | int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq) |
330 | { |
331 | struct device_node *p; |
332 | const __be32 *addr; |
333 | u32 intsize; |
334 | int i, res; |
335 | |
336 | pr_debug("of_irq_parse_one: dev=%pOF, index=%d\n" , device, index); |
337 | |
338 | /* OldWorld mac stuff is "special", handle out of line */ |
339 | if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC) |
340 | return of_irq_parse_oldworld(device, index, out_irq); |
341 | |
342 | /* Get the reg property (if any) */ |
343 | addr = of_get_property(node: device, name: "reg" , NULL); |
344 | |
345 | /* Try the new-style interrupts-extended first */ |
346 | res = of_parse_phandle_with_args(np: device, list_name: "interrupts-extended" , |
347 | cells_name: "#interrupt-cells" , index, out_args: out_irq); |
348 | if (!res) |
349 | return of_irq_parse_raw(addr, out_irq); |
350 | |
351 | /* Look for the interrupt parent. */ |
352 | p = of_irq_find_parent(device); |
353 | if (p == NULL) |
354 | return -EINVAL; |
355 | |
356 | /* Get size of interrupt specifier */ |
357 | if (of_property_read_u32(np: p, propname: "#interrupt-cells" , out_value: &intsize)) { |
358 | res = -EINVAL; |
359 | goto out; |
360 | } |
361 | |
362 | pr_debug(" parent=%pOF, intsize=%d\n" , p, intsize); |
363 | |
364 | /* Copy intspec into irq structure */ |
365 | out_irq->np = p; |
366 | out_irq->args_count = intsize; |
367 | for (i = 0; i < intsize; i++) { |
368 | res = of_property_read_u32_index(np: device, propname: "interrupts" , |
369 | index: (index * intsize) + i, |
370 | out_value: out_irq->args + i); |
371 | if (res) |
372 | goto out; |
373 | } |
374 | |
375 | pr_debug(" intspec=%d\n" , *out_irq->args); |
376 | |
377 | |
378 | /* Check if there are any interrupt-map translations to process */ |
379 | res = of_irq_parse_raw(addr, out_irq); |
380 | out: |
381 | of_node_put(node: p); |
382 | return res; |
383 | } |
384 | EXPORT_SYMBOL_GPL(of_irq_parse_one); |
385 | |
386 | /** |
387 | * of_irq_to_resource - Decode a node's IRQ and return it as a resource |
388 | * @dev: pointer to device tree node |
389 | * @index: zero-based index of the irq |
390 | * @r: pointer to resource structure to return result into. |
391 | */ |
392 | int of_irq_to_resource(struct device_node *dev, int index, struct resource *r) |
393 | { |
394 | int irq = of_irq_get(dev, index); |
395 | |
396 | if (irq < 0) |
397 | return irq; |
398 | |
399 | /* Only dereference the resource if both the |
400 | * resource and the irq are valid. */ |
401 | if (r && irq) { |
402 | const char *name = NULL; |
403 | |
404 | memset(r, 0, sizeof(*r)); |
405 | /* |
406 | * Get optional "interrupt-names" property to add a name |
407 | * to the resource. |
408 | */ |
409 | of_property_read_string_index(np: dev, propname: "interrupt-names" , index, |
410 | output: &name); |
411 | |
412 | r->start = r->end = irq; |
413 | r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(d: irq_get_irq_data(irq)); |
414 | r->name = name ? name : of_node_full_name(np: dev); |
415 | } |
416 | |
417 | return irq; |
418 | } |
419 | EXPORT_SYMBOL_GPL(of_irq_to_resource); |
420 | |
421 | /** |
422 | * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number |
423 | * @dev: pointer to device tree node |
424 | * @index: zero-based index of the IRQ |
425 | * |
426 | * Return: Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
427 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case |
428 | * of any other failure. |
429 | */ |
430 | int of_irq_get(struct device_node *dev, int index) |
431 | { |
432 | int rc; |
433 | struct of_phandle_args oirq; |
434 | struct irq_domain *domain; |
435 | |
436 | rc = of_irq_parse_one(dev, index, &oirq); |
437 | if (rc) |
438 | return rc; |
439 | |
440 | domain = irq_find_host(node: oirq.np); |
441 | if (!domain) { |
442 | rc = -EPROBE_DEFER; |
443 | goto out; |
444 | } |
445 | |
446 | rc = irq_create_of_mapping(irq_data: &oirq); |
447 | out: |
448 | of_node_put(node: oirq.np); |
449 | |
450 | return rc; |
451 | } |
452 | EXPORT_SYMBOL_GPL(of_irq_get); |
453 | |
454 | /** |
455 | * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number |
456 | * @dev: pointer to device tree node |
457 | * @name: IRQ name |
458 | * |
459 | * Return: Linux IRQ number on success, or 0 on the IRQ mapping failure, or |
460 | * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case |
461 | * of any other failure. |
462 | */ |
463 | int of_irq_get_byname(struct device_node *dev, const char *name) |
464 | { |
465 | int index; |
466 | |
467 | if (unlikely(!name)) |
468 | return -EINVAL; |
469 | |
470 | index = of_property_match_string(np: dev, propname: "interrupt-names" , string: name); |
471 | if (index < 0) |
472 | return index; |
473 | |
474 | return of_irq_get(dev, index); |
475 | } |
476 | EXPORT_SYMBOL_GPL(of_irq_get_byname); |
477 | |
478 | /** |
479 | * of_irq_count - Count the number of IRQs a node uses |
480 | * @dev: pointer to device tree node |
481 | */ |
482 | int of_irq_count(struct device_node *dev) |
483 | { |
484 | struct of_phandle_args irq; |
485 | int nr = 0; |
486 | |
487 | while (of_irq_parse_one(dev, nr, &irq) == 0) |
488 | nr++; |
489 | |
490 | return nr; |
491 | } |
492 | |
493 | /** |
494 | * of_irq_to_resource_table - Fill in resource table with node's IRQ info |
495 | * @dev: pointer to device tree node |
496 | * @res: array of resources to fill in |
497 | * @nr_irqs: the number of IRQs (and upper bound for num of @res elements) |
498 | * |
499 | * Return: The size of the filled in table (up to @nr_irqs). |
500 | */ |
501 | int of_irq_to_resource_table(struct device_node *dev, struct resource *res, |
502 | int nr_irqs) |
503 | { |
504 | int i; |
505 | |
506 | for (i = 0; i < nr_irqs; i++, res++) |
507 | if (of_irq_to_resource(dev, i, res) <= 0) |
508 | break; |
509 | |
510 | return i; |
511 | } |
512 | EXPORT_SYMBOL_GPL(of_irq_to_resource_table); |
513 | |
514 | struct of_intc_desc { |
515 | struct list_head list; |
516 | of_irq_init_cb_t irq_init_cb; |
517 | struct device_node *dev; |
518 | struct device_node *interrupt_parent; |
519 | }; |
520 | |
521 | /** |
522 | * of_irq_init - Scan and init matching interrupt controllers in DT |
523 | * @matches: 0 terminated array of nodes to match and init function to call |
524 | * |
525 | * This function scans the device tree for matching interrupt controller nodes, |
526 | * and calls their initialization functions in order with parents first. |
527 | */ |
528 | void __init of_irq_init(const struct of_device_id *matches) |
529 | { |
530 | const struct of_device_id *match; |
531 | struct device_node *np, *parent = NULL; |
532 | struct of_intc_desc *desc, *temp_desc; |
533 | struct list_head intc_desc_list, intc_parent_list; |
534 | |
535 | INIT_LIST_HEAD(list: &intc_desc_list); |
536 | INIT_LIST_HEAD(list: &intc_parent_list); |
537 | |
538 | for_each_matching_node_and_match(np, matches, &match) { |
539 | if (!of_property_read_bool(np, propname: "interrupt-controller" ) || |
540 | !of_device_is_available(device: np)) |
541 | continue; |
542 | |
543 | if (WARN(!match->data, "of_irq_init: no init function for %s\n" , |
544 | match->compatible)) |
545 | continue; |
546 | |
547 | /* |
548 | * Here, we allocate and populate an of_intc_desc with the node |
549 | * pointer, interrupt-parent device_node etc. |
550 | */ |
551 | desc = kzalloc(size: sizeof(*desc), GFP_KERNEL); |
552 | if (!desc) { |
553 | of_node_put(node: np); |
554 | goto err; |
555 | } |
556 | |
557 | desc->irq_init_cb = match->data; |
558 | desc->dev = of_node_get(node: np); |
559 | /* |
560 | * interrupts-extended can reference multiple parent domains. |
561 | * Arbitrarily pick the first one; assume any other parents |
562 | * are the same distance away from the root irq controller. |
563 | */ |
564 | desc->interrupt_parent = of_parse_phandle(np, phandle_name: "interrupts-extended" , index: 0); |
565 | if (!desc->interrupt_parent) |
566 | desc->interrupt_parent = of_irq_find_parent(np); |
567 | if (desc->interrupt_parent == np) { |
568 | of_node_put(node: desc->interrupt_parent); |
569 | desc->interrupt_parent = NULL; |
570 | } |
571 | list_add_tail(new: &desc->list, head: &intc_desc_list); |
572 | } |
573 | |
574 | /* |
575 | * The root irq controller is the one without an interrupt-parent. |
576 | * That one goes first, followed by the controllers that reference it, |
577 | * followed by the ones that reference the 2nd level controllers, etc. |
578 | */ |
579 | while (!list_empty(head: &intc_desc_list)) { |
580 | /* |
581 | * Process all controllers with the current 'parent'. |
582 | * First pass will be looking for NULL as the parent. |
583 | * The assumption is that NULL parent means a root controller. |
584 | */ |
585 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { |
586 | int ret; |
587 | |
588 | if (desc->interrupt_parent != parent) |
589 | continue; |
590 | |
591 | list_del(entry: &desc->list); |
592 | |
593 | of_node_set_flag(n: desc->dev, OF_POPULATED); |
594 | |
595 | pr_debug("of_irq_init: init %pOF (%p), parent %p\n" , |
596 | desc->dev, |
597 | desc->dev, desc->interrupt_parent); |
598 | ret = desc->irq_init_cb(desc->dev, |
599 | desc->interrupt_parent); |
600 | if (ret) { |
601 | pr_err("%s: Failed to init %pOF (%p), parent %p\n" , |
602 | __func__, desc->dev, desc->dev, |
603 | desc->interrupt_parent); |
604 | of_node_clear_flag(n: desc->dev, OF_POPULATED); |
605 | kfree(objp: desc); |
606 | continue; |
607 | } |
608 | |
609 | /* |
610 | * This one is now set up; add it to the parent list so |
611 | * its children can get processed in a subsequent pass. |
612 | */ |
613 | list_add_tail(new: &desc->list, head: &intc_parent_list); |
614 | } |
615 | |
616 | /* Get the next pending parent that might have children */ |
617 | desc = list_first_entry_or_null(&intc_parent_list, |
618 | typeof(*desc), list); |
619 | if (!desc) { |
620 | pr_err("of_irq_init: children remain, but no parents\n" ); |
621 | break; |
622 | } |
623 | list_del(entry: &desc->list); |
624 | parent = desc->dev; |
625 | kfree(objp: desc); |
626 | } |
627 | |
628 | list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) { |
629 | list_del(entry: &desc->list); |
630 | kfree(objp: desc); |
631 | } |
632 | err: |
633 | list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) { |
634 | list_del(entry: &desc->list); |
635 | of_node_put(node: desc->dev); |
636 | kfree(objp: desc); |
637 | } |
638 | } |
639 | |
640 | static u32 __of_msi_map_id(struct device *dev, struct device_node **np, |
641 | u32 id_in) |
642 | { |
643 | struct device *parent_dev; |
644 | u32 id_out = id_in; |
645 | |
646 | /* |
647 | * Walk up the device parent links looking for one with a |
648 | * "msi-map" property. |
649 | */ |
650 | for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent) |
651 | if (!of_map_id(np: parent_dev->of_node, id: id_in, map_name: "msi-map" , |
652 | map_mask_name: "msi-map-mask" , target: np, id_out: &id_out)) |
653 | break; |
654 | return id_out; |
655 | } |
656 | |
657 | /** |
658 | * of_msi_map_id - Map a MSI ID for a device. |
659 | * @dev: device for which the mapping is to be done. |
660 | * @msi_np: device node of the expected msi controller. |
661 | * @id_in: unmapped MSI ID for the device. |
662 | * |
663 | * Walk up the device hierarchy looking for devices with a "msi-map" |
664 | * property. If found, apply the mapping to @id_in. |
665 | * |
666 | * Return: The mapped MSI ID. |
667 | */ |
668 | u32 of_msi_map_id(struct device *dev, struct device_node *msi_np, u32 id_in) |
669 | { |
670 | return __of_msi_map_id(dev, np: &msi_np, id_in); |
671 | } |
672 | |
673 | /** |
674 | * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain |
675 | * @dev: device for which the mapping is to be done. |
676 | * @id: Device ID. |
677 | * @bus_token: Bus token |
678 | * |
679 | * Walk up the device hierarchy looking for devices with a "msi-map" |
680 | * property. |
681 | * |
682 | * Returns: the MSI domain for this device (or NULL on failure) |
683 | */ |
684 | struct irq_domain *of_msi_map_get_device_domain(struct device *dev, u32 id, |
685 | u32 bus_token) |
686 | { |
687 | struct device_node *np = NULL; |
688 | |
689 | __of_msi_map_id(dev, np: &np, id_in: id); |
690 | return irq_find_matching_host(node: np, bus_token); |
691 | } |
692 | |
693 | /** |
694 | * of_msi_get_domain - Use msi-parent to find the relevant MSI domain |
695 | * @dev: device for which the domain is requested |
696 | * @np: device node for @dev |
697 | * @token: bus type for this domain |
698 | * |
699 | * Parse the msi-parent property (both the simple and the complex |
700 | * versions), and returns the corresponding MSI domain. |
701 | * |
702 | * Returns: the MSI domain for this device (or NULL on failure). |
703 | */ |
704 | struct irq_domain *of_msi_get_domain(struct device *dev, |
705 | struct device_node *np, |
706 | enum irq_domain_bus_token token) |
707 | { |
708 | struct device_node *msi_np; |
709 | struct irq_domain *d; |
710 | |
711 | /* Check for a single msi-parent property */ |
712 | msi_np = of_parse_phandle(np, phandle_name: "msi-parent" , index: 0); |
713 | if (msi_np && !of_property_read_bool(np: msi_np, propname: "#msi-cells" )) { |
714 | d = irq_find_matching_host(node: msi_np, bus_token: token); |
715 | if (!d) |
716 | of_node_put(node: msi_np); |
717 | return d; |
718 | } |
719 | |
720 | if (token == DOMAIN_BUS_PLATFORM_MSI) { |
721 | /* Check for the complex msi-parent version */ |
722 | struct of_phandle_args args; |
723 | int index = 0; |
724 | |
725 | while (!of_parse_phandle_with_args(np, list_name: "msi-parent" , |
726 | cells_name: "#msi-cells" , |
727 | index, out_args: &args)) { |
728 | d = irq_find_matching_host(node: args.np, bus_token: token); |
729 | if (d) |
730 | return d; |
731 | |
732 | of_node_put(node: args.np); |
733 | index++; |
734 | } |
735 | } |
736 | |
737 | return NULL; |
738 | } |
739 | EXPORT_SYMBOL_GPL(of_msi_get_domain); |
740 | |
741 | /** |
742 | * of_msi_configure - Set the msi_domain field of a device |
743 | * @dev: device structure to associate with an MSI irq domain |
744 | * @np: device node for that device |
745 | */ |
746 | void of_msi_configure(struct device *dev, struct device_node *np) |
747 | { |
748 | dev_set_msi_domain(dev, |
749 | d: of_msi_get_domain(dev, np, DOMAIN_BUS_PLATFORM_MSI)); |
750 | } |
751 | EXPORT_SYMBOL_GPL(of_msi_configure); |
752 | |