blob: a3c1c5aae6a9eaa5de0ecd0dd0335771ac8f7fab [file] [log] [blame]
Grant Likelye3873442010-06-18 11:09:59 -06001/*
2 * Derived from arch/i386/kernel/irq.c
3 * Copyright (C) 1992 Linus Torvalds
4 * Adapted from arch/i386 by Gary Thomas
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 * Updated and modified by Cort Dougan <cort@fsmlabs.com>
7 * Copyright (C) 1996-2001 Cort Dougan
8 * Adapted for Power Macintosh by Paul Mackerras
9 * Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 *
16 * This file contains the code used to make IRQ descriptions in the
17 * device tree to actual irq numbers on an interrupt controller
18 * driver.
19 */
20
21#include <linux/errno.h>
Rob Herringc71a54b2011-09-20 15:13:50 -050022#include <linux/list.h>
Grant Likelye3873442010-06-18 11:09:59 -060023#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/of_irq.h>
26#include <linux/string.h>
Rob Herringc71a54b2011-09-20 15:13:50 -050027#include <linux/slab.h>
Grant Likelye3873442010-06-18 11:09:59 -060028
29/**
30 * irq_of_parse_and_map - Parse and map an interrupt into linux virq space
31 * @device: Device node of the device whose interrupt is to be mapped
32 * @index: Index of the interrupt to map
33 *
34 * This function is a wrapper that chains of_irq_map_one() and
35 * irq_create_of_mapping() to make things easier to callers
36 */
37unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
38{
39 struct of_irq oirq;
40
41 if (of_irq_map_one(dev, index, &oirq))
Anton Vorontsov77a73002011-12-07 03:16:26 +040042 return 0;
Grant Likelye3873442010-06-18 11:09:59 -060043
44 return irq_create_of_mapping(oirq.controller, oirq.specifier,
45 oirq.size);
46}
47EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
Grant Likely7dc2e112010-06-08 07:48:06 -060048
49/**
50 * of_irq_find_parent - Given a device node, find its interrupt parent node
51 * @child: pointer to device node
52 *
53 * Returns a pointer to the interrupt parent node, or NULL if the interrupt
54 * parent could not be determined.
55 */
Michael Ellerman0b2e9a82011-04-14 22:31:57 +000056struct device_node *of_irq_find_parent(struct device_node *child)
Grant Likely7dc2e112010-06-08 07:48:06 -060057{
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080058 struct device_node *p;
Grant Likely9a6b2e52010-07-23 01:48:25 -060059 const __be32 *parp;
Grant Likely7dc2e112010-06-08 07:48:06 -060060
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080061 if (!of_node_get(child))
Grant Likely7dc2e112010-06-08 07:48:06 -060062 return NULL;
63
64 do {
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080065 parp = of_get_property(child, "interrupt-parent", NULL);
Grant Likely7dc2e112010-06-08 07:48:06 -060066 if (parp == NULL)
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080067 p = of_get_parent(child);
Grant Likely7dc2e112010-06-08 07:48:06 -060068 else {
69 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
70 p = of_node_get(of_irq_dflt_pic);
71 else
Grant Likely9a6b2e52010-07-23 01:48:25 -060072 p = of_find_node_by_phandle(be32_to_cpup(parp));
Grant Likely7dc2e112010-06-08 07:48:06 -060073 }
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080074 of_node_put(child);
75 child = p;
Grant Likely7dc2e112010-06-08 07:48:06 -060076 } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
77
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080078 return p;
Grant Likely7dc2e112010-06-08 07:48:06 -060079}
80
81/**
82 * of_irq_map_raw - Low level interrupt tree parsing
83 * @parent: the device interrupt parent
84 * @intspec: interrupt specifier ("interrupts" property of the device)
85 * @ointsize: size of the passed in interrupt specifier
86 * @addr: address specifier (start of "reg" property of the device)
87 * @out_irq: structure of_irq filled by this function
88 *
89 * Returns 0 on success and a negative number on error
90 *
91 * This function is a low-level interrupt tree walking function. It
92 * can be used to do a partial walk with synthetized reg and interrupts
93 * properties, for example when resolving PCI interrupts when no device
94 * node exist for the parent.
95 */
Grant Likelyd2f71832010-07-23 16:56:19 -060096int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
97 u32 ointsize, const __be32 *addr, struct of_irq *out_irq)
Grant Likely7dc2e112010-06-08 07:48:06 -060098{
99 struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
Rob Herringa7c194b2010-06-08 07:48:08 -0600100 const __be32 *tmp, *imap, *imask;
Grant Likely7dc2e112010-06-08 07:48:06 -0600101 u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
102 int imaplen, match, i;
103
104 pr_debug("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
Grant Likelyd2f71832010-07-23 16:56:19 -0600105 parent->full_name, be32_to_cpup(intspec),
106 be32_to_cpup(intspec + 1), ointsize);
Grant Likely7dc2e112010-06-08 07:48:06 -0600107
108 ipar = of_node_get(parent);
109
110 /* First get the #interrupt-cells property of the current cursor
111 * that tells us how to interpret the passed-in intspec. If there
112 * is none, we are nice and just walk up the tree
113 */
114 do {
115 tmp = of_get_property(ipar, "#interrupt-cells", NULL);
116 if (tmp != NULL) {
Rob Herringa7c194b2010-06-08 07:48:08 -0600117 intsize = be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600118 break;
119 }
120 tnode = ipar;
121 ipar = of_irq_find_parent(ipar);
122 of_node_put(tnode);
123 } while (ipar);
124 if (ipar == NULL) {
125 pr_debug(" -> no parent found !\n");
126 goto fail;
127 }
128
129 pr_debug("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
130
131 if (ointsize != intsize)
132 return -EINVAL;
133
134 /* Look for this #address-cells. We have to implement the old linux
135 * trick of looking for the parent here as some device-trees rely on it
136 */
137 old = of_node_get(ipar);
138 do {
139 tmp = of_get_property(old, "#address-cells", NULL);
140 tnode = of_get_parent(old);
141 of_node_put(old);
142 old = tnode;
143 } while (old && tmp == NULL);
144 of_node_put(old);
145 old = NULL;
Rob Herringa7c194b2010-06-08 07:48:08 -0600146 addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600147
148 pr_debug(" -> addrsize=%d\n", addrsize);
149
150 /* Now start the actual "proper" walk of the interrupt tree */
151 while (ipar != NULL) {
152 /* Now check if cursor is an interrupt-controller and if it is
153 * then we are done
154 */
155 if (of_get_property(ipar, "interrupt-controller", NULL) !=
156 NULL) {
157 pr_debug(" -> got it !\n");
Rob Herringa7c194b2010-06-08 07:48:08 -0600158 for (i = 0; i < intsize; i++)
159 out_irq->specifier[i] =
160 of_read_number(intspec +i, 1);
Grant Likely7dc2e112010-06-08 07:48:06 -0600161 out_irq->size = intsize;
162 out_irq->controller = ipar;
163 of_node_put(old);
164 return 0;
165 }
166
167 /* Now look for an interrupt-map */
168 imap = of_get_property(ipar, "interrupt-map", &imaplen);
169 /* No interrupt map, check for an interrupt parent */
170 if (imap == NULL) {
171 pr_debug(" -> no map, getting parent\n");
172 newpar = of_irq_find_parent(ipar);
173 goto skiplevel;
174 }
175 imaplen /= sizeof(u32);
176
177 /* Look for a mask */
178 imask = of_get_property(ipar, "interrupt-map-mask", NULL);
179
180 /* If we were passed no "reg" property and we attempt to parse
181 * an interrupt-map, then #address-cells must be 0.
182 * Fail if it's not.
183 */
184 if (addr == NULL && addrsize != 0) {
185 pr_debug(" -> no reg passed in when needed !\n");
186 goto fail;
187 }
188
189 /* Parse interrupt-map */
190 match = 0;
191 while (imaplen > (addrsize + intsize + 1) && !match) {
192 /* Compare specifiers */
193 match = 1;
194 for (i = 0; i < addrsize && match; ++i) {
Kim Phillipsd2e41512012-10-08 19:42:04 -0500195 __be32 mask = imask ? imask[i]
196 : cpu_to_be32(0xffffffffu);
Grant Likely7dc2e112010-06-08 07:48:06 -0600197 match = ((addr[i] ^ imap[i]) & mask) == 0;
198 }
199 for (; i < (addrsize + intsize) && match; ++i) {
Kim Phillipsd2e41512012-10-08 19:42:04 -0500200 __be32 mask = imask ? imask[i]
201 : cpu_to_be32(0xffffffffu);
Grant Likely7dc2e112010-06-08 07:48:06 -0600202 match =
203 ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
204 }
205 imap += addrsize + intsize;
206 imaplen -= addrsize + intsize;
207
208 pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
209
210 /* Get the interrupt parent */
211 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
212 newpar = of_node_get(of_irq_dflt_pic);
213 else
Grant Likely9a6b2e52010-07-23 01:48:25 -0600214 newpar = of_find_node_by_phandle(be32_to_cpup(imap));
Grant Likely7dc2e112010-06-08 07:48:06 -0600215 imap++;
216 --imaplen;
217
218 /* Check if not found */
219 if (newpar == NULL) {
220 pr_debug(" -> imap parent not found !\n");
221 goto fail;
222 }
223
224 /* Get #interrupt-cells and #address-cells of new
225 * parent
226 */
227 tmp = of_get_property(newpar, "#interrupt-cells", NULL);
228 if (tmp == NULL) {
229 pr_debug(" -> parent lacks #interrupt-cells!\n");
230 goto fail;
231 }
Rob Herringa7c194b2010-06-08 07:48:08 -0600232 newintsize = be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600233 tmp = of_get_property(newpar, "#address-cells", NULL);
Rob Herringa7c194b2010-06-08 07:48:08 -0600234 newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600235
236 pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
237 newintsize, newaddrsize);
238
239 /* Check for malformed properties */
240 if (imaplen < (newaddrsize + newintsize))
241 goto fail;
242
243 imap += newaddrsize + newintsize;
244 imaplen -= newaddrsize + newintsize;
245
246 pr_debug(" -> imaplen=%d\n", imaplen);
247 }
248 if (!match)
249 goto fail;
250
251 of_node_put(old);
252 old = of_node_get(newpar);
253 addrsize = newaddrsize;
254 intsize = newintsize;
255 intspec = imap - intsize;
256 addr = intspec - addrsize;
257
258 skiplevel:
259 /* Iterate again with new parent */
Grant Likely74a7f082012-06-15 11:50:25 -0600260 pr_debug(" -> new parent: %s\n", of_node_full_name(newpar));
Grant Likely7dc2e112010-06-08 07:48:06 -0600261 of_node_put(ipar);
262 ipar = newpar;
263 newpar = NULL;
264 }
265 fail:
266 of_node_put(ipar);
267 of_node_put(old);
268 of_node_put(newpar);
269
270 return -EINVAL;
271}
272EXPORT_SYMBOL_GPL(of_irq_map_raw);
273
274/**
275 * of_irq_map_one - Resolve an interrupt for a device
276 * @device: the device whose interrupt is to be resolved
277 * @index: index of the interrupt to resolve
278 * @out_irq: structure of_irq filled by this function
279 *
280 * This function resolves an interrupt, walking the tree, for a given
281 * device-tree node. It's the high level pendant to of_irq_map_raw().
282 */
283int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
284{
285 struct device_node *p;
Grant Likelyd2f71832010-07-23 16:56:19 -0600286 const __be32 *intspec, *tmp, *addr;
Grant Likely7dc2e112010-06-08 07:48:06 -0600287 u32 intsize, intlen;
288 int res = -EINVAL;
289
290 pr_debug("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);
291
292 /* OldWorld mac stuff is "special", handle out of line */
293 if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
294 return of_irq_map_oldworld(device, index, out_irq);
295
296 /* Get the interrupts property */
297 intspec = of_get_property(device, "interrupts", &intlen);
298 if (intspec == NULL)
299 return -EINVAL;
Grant Likelyd2f71832010-07-23 16:56:19 -0600300 intlen /= sizeof(*intspec);
Grant Likely7dc2e112010-06-08 07:48:06 -0600301
Grant Likelyd2f71832010-07-23 16:56:19 -0600302 pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);
Grant Likely7dc2e112010-06-08 07:48:06 -0600303
304 /* Get the reg property (if any) */
305 addr = of_get_property(device, "reg", NULL);
306
307 /* Look for the interrupt parent. */
308 p = of_irq_find_parent(device);
309 if (p == NULL)
310 return -EINVAL;
311
312 /* Get size of interrupt specifier */
313 tmp = of_get_property(p, "#interrupt-cells", NULL);
314 if (tmp == NULL)
315 goto out;
Rob Herringa7c194b2010-06-08 07:48:08 -0600316 intsize = be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600317
318 pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
319
320 /* Check index */
321 if ((index + 1) * intsize > intlen)
322 goto out;
323
324 /* Get new specifier and map it */
325 res = of_irq_map_raw(p, intspec + index * intsize, intsize,
326 addr, out_irq);
327 out:
328 of_node_put(p);
329 return res;
330}
331EXPORT_SYMBOL_GPL(of_irq_map_one);
332
333/**
334 * of_irq_to_resource - Decode a node's IRQ and return it as a resource
335 * @dev: pointer to device tree node
336 * @index: zero-based index of the irq
337 * @r: pointer to resource structure to return result into.
338 */
339int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
340{
341 int irq = irq_of_parse_and_map(dev, index);
342
343 /* Only dereference the resource if both the
344 * resource and the irq are valid. */
Anton Vorontsov77a73002011-12-07 03:16:26 +0400345 if (r && irq) {
Benoit Cousson661db792011-12-05 15:23:56 +0100346 const char *name = NULL;
347
348 /*
349 * Get optional "interrupts-names" property to add a name
350 * to the resource.
351 */
352 of_property_read_string_index(dev, "interrupt-names", index,
353 &name);
354
Grant Likely7dc2e112010-06-08 07:48:06 -0600355 r->start = r->end = irq;
356 r->flags = IORESOURCE_IRQ;
Benoit Cousson661db792011-12-05 15:23:56 +0100357 r->name = name ? name : dev->full_name;
Grant Likely7dc2e112010-06-08 07:48:06 -0600358 }
359
360 return irq;
361}
362EXPORT_SYMBOL_GPL(of_irq_to_resource);
Andres Salomon52f65372010-10-10 21:35:05 -0600363
364/**
365 * of_irq_count - Count the number of IRQs a node uses
366 * @dev: pointer to device tree node
367 */
368int of_irq_count(struct device_node *dev)
369{
370 int nr = 0;
371
Anton Vorontsov77a73002011-12-07 03:16:26 +0400372 while (of_irq_to_resource(dev, nr, NULL))
Andres Salomon52f65372010-10-10 21:35:05 -0600373 nr++;
374
375 return nr;
376}
377
378/**
379 * of_irq_to_resource_table - Fill in resource table with node's IRQ info
380 * @dev: pointer to device tree node
381 * @res: array of resources to fill in
382 * @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
383 *
384 * Returns the size of the filled in table (up to @nr_irqs).
385 */
386int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
387 int nr_irqs)
388{
389 int i;
390
391 for (i = 0; i < nr_irqs; i++, res++)
Anton Vorontsov77a73002011-12-07 03:16:26 +0400392 if (!of_irq_to_resource(dev, i, res))
Andres Salomon52f65372010-10-10 21:35:05 -0600393 break;
394
395 return i;
396}
John Crispina4f8bf22012-08-26 09:13:09 +0200397EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
Rob Herringc71a54b2011-09-20 15:13:50 -0500398
399struct intc_desc {
400 struct list_head list;
401 struct device_node *dev;
402 struct device_node *interrupt_parent;
403};
404
405/**
406 * of_irq_init - Scan and init matching interrupt controllers in DT
407 * @matches: 0 terminated array of nodes to match and init function to call
408 *
409 * This function scans the device tree for matching interrupt controller nodes,
410 * and calls their initialization functions in order with parents first.
411 */
412void __init of_irq_init(const struct of_device_id *matches)
413{
414 struct device_node *np, *parent = NULL;
415 struct intc_desc *desc, *temp_desc;
416 struct list_head intc_desc_list, intc_parent_list;
417
418 INIT_LIST_HEAD(&intc_desc_list);
419 INIT_LIST_HEAD(&intc_parent_list);
420
421 for_each_matching_node(np, matches) {
422 if (!of_find_property(np, "interrupt-controller", NULL))
423 continue;
424 /*
425 * Here, we allocate and populate an intc_desc with the node
426 * pointer, interrupt-parent device_node etc.
427 */
428 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
429 if (WARN_ON(!desc))
430 goto err;
431
432 desc->dev = np;
433 desc->interrupt_parent = of_irq_find_parent(np);
Rob Herringd7fb6d02011-11-27 20:16:33 -0600434 if (desc->interrupt_parent == np)
435 desc->interrupt_parent = NULL;
Rob Herringc71a54b2011-09-20 15:13:50 -0500436 list_add_tail(&desc->list, &intc_desc_list);
437 }
438
439 /*
440 * The root irq controller is the one without an interrupt-parent.
441 * That one goes first, followed by the controllers that reference it,
442 * followed by the ones that reference the 2nd level controllers, etc.
443 */
444 while (!list_empty(&intc_desc_list)) {
445 /*
446 * Process all controllers with the current 'parent'.
447 * First pass will be looking for NULL as the parent.
448 * The assumption is that NULL parent means a root controller.
449 */
450 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
451 const struct of_device_id *match;
452 int ret;
453 of_irq_init_cb_t irq_init_cb;
454
455 if (desc->interrupt_parent != parent)
456 continue;
457
458 list_del(&desc->list);
459 match = of_match_node(matches, desc->dev);
460 if (WARN(!match->data,
461 "of_irq_init: no init function for %s\n",
462 match->compatible)) {
463 kfree(desc);
464 continue;
465 }
466
467 pr_debug("of_irq_init: init %s @ %p, parent %p\n",
468 match->compatible,
469 desc->dev, desc->interrupt_parent);
Kim Phillipsd2e41512012-10-08 19:42:04 -0500470 irq_init_cb = (of_irq_init_cb_t)match->data;
Rob Herringc71a54b2011-09-20 15:13:50 -0500471 ret = irq_init_cb(desc->dev, desc->interrupt_parent);
472 if (ret) {
473 kfree(desc);
474 continue;
475 }
476
477 /*
478 * This one is now set up; add it to the parent list so
479 * its children can get processed in a subsequent pass.
480 */
481 list_add_tail(&desc->list, &intc_parent_list);
482 }
483
484 /* Get the next pending parent that might have children */
485 desc = list_first_entry(&intc_parent_list, typeof(*desc), list);
486 if (list_empty(&intc_parent_list) || !desc) {
487 pr_err("of_irq_init: children remain, but no parents\n");
488 break;
489 }
490 list_del(&desc->list);
491 parent = desc->dev;
492 kfree(desc);
493 }
494
495 list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) {
496 list_del(&desc->list);
497 kfree(desc);
498 }
499err:
500 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
501 list_del(&desc->list);
502 kfree(desc);
503 }
504}