blob: 0d7765807f4940c1aa892665a78e0b32c4128528 [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
Yijing Wangd84ff462013-08-31 09:44:10 +080031 * @dev: Device node of the device whose interrupt is to be mapped
Grant Likelye3873442010-06-18 11:09:59 -060032 * @index: Index of the interrupt to map
33 *
Grant Likely0c02c802013-09-19 11:22:36 -050034 * This function is a wrapper that chains of_irq_parse_one() and
Grant Likelye3873442010-06-18 11:09:59 -060035 * 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{
Grant Likely530210c2013-09-15 16:39:11 +010039 struct of_phandle_args oirq;
Grant Likelye3873442010-06-18 11:09:59 -060040
Grant Likely0c02c802013-09-19 11:22:36 -050041 if (of_irq_parse_one(dev, index, &oirq))
Anton Vorontsov77a73002011-12-07 03:16:26 +040042 return 0;
Grant Likelye3873442010-06-18 11:09:59 -060043
Grant Likelye6d30ab2013-09-15 16:55:53 +010044 return irq_create_of_mapping(&oirq);
Grant Likelye3873442010-06-18 11:09:59 -060045}
46EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
Grant Likely7dc2e112010-06-08 07:48:06 -060047
48/**
49 * of_irq_find_parent - Given a device node, find its interrupt parent node
50 * @child: pointer to device node
51 *
52 * Returns a pointer to the interrupt parent node, or NULL if the interrupt
53 * parent could not be determined.
54 */
Michael Ellerman0b2e9a82011-04-14 22:31:57 +000055struct device_node *of_irq_find_parent(struct device_node *child)
Grant Likely7dc2e112010-06-08 07:48:06 -060056{
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080057 struct device_node *p;
Grant Likely9a6b2e52010-07-23 01:48:25 -060058 const __be32 *parp;
Grant Likely7dc2e112010-06-08 07:48:06 -060059
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080060 if (!of_node_get(child))
Grant Likely7dc2e112010-06-08 07:48:06 -060061 return NULL;
62
63 do {
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080064 parp = of_get_property(child, "interrupt-parent", NULL);
Grant Likely7dc2e112010-06-08 07:48:06 -060065 if (parp == NULL)
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080066 p = of_get_parent(child);
Grant Likely7dc2e112010-06-08 07:48:06 -060067 else {
68 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
69 p = of_node_get(of_irq_dflt_pic);
70 else
Grant Likely9a6b2e52010-07-23 01:48:25 -060071 p = of_find_node_by_phandle(be32_to_cpup(parp));
Grant Likely7dc2e112010-06-08 07:48:06 -060072 }
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080073 of_node_put(child);
74 child = p;
Grant Likely7dc2e112010-06-08 07:48:06 -060075 } while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
76
Linus Torvaldsb4bbb022011-11-22 15:09:20 -080077 return p;
Grant Likely7dc2e112010-06-08 07:48:06 -060078}
79
80/**
Grant Likely0c02c802013-09-19 11:22:36 -050081 * of_irq_parse_raw - Low level interrupt tree parsing
Grant Likely7dc2e112010-06-08 07:48:06 -060082 * @parent: the device interrupt parent
Grant Likely23616132013-09-15 22:32:39 +010083 * @addr: address specifier (start of "reg" property of the device) in be32 format
84 * @out_irq: structure of_irq updated by this function
Grant Likely7dc2e112010-06-08 07:48:06 -060085 *
86 * Returns 0 on success and a negative number on error
87 *
88 * This function is a low-level interrupt tree walking function. It
89 * can be used to do a partial walk with synthetized reg and interrupts
90 * properties, for example when resolving PCI interrupts when no device
Grant Likely23616132013-09-15 22:32:39 +010091 * node exist for the parent. It takes an interrupt specifier structure as
92 * input, walks the tree looking for any interrupt-map properties, translates
93 * the specifier for each map, and then returns the translated map.
Grant Likely7dc2e112010-06-08 07:48:06 -060094 */
Grant Likely23616132013-09-15 22:32:39 +010095int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
Grant Likely7dc2e112010-06-08 07:48:06 -060096{
97 struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
Grant Likely355e62f2013-11-02 00:11:02 -070098 __be32 initial_match_array[MAX_PHANDLE_ARGS];
Grant Likely23616132013-09-15 22:32:39 +010099 const __be32 *match_array = initial_match_array;
Grant Likely355e62f2013-11-02 00:11:02 -0700100 const __be32 *tmp, *imap, *imask, dummy_imask[] = { [0 ... MAX_PHANDLE_ARGS] = ~0 };
Grant Likely7dc2e112010-06-08 07:48:06 -0600101 u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
102 int imaplen, match, i;
103
Grant Likely624cfca2013-10-11 22:05:10 +0100104#ifdef DEBUG
105 of_print_phandle_args("of_irq_parse_raw: ", out_irq);
106#endif
Grant Likely7dc2e112010-06-08 07:48:06 -0600107
Grant Likely23616132013-09-15 22:32:39 +0100108 ipar = of_node_get(out_irq->np);
Grant Likely7dc2e112010-06-08 07:48:06 -0600109
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
Grant Likely0c02c802013-09-19 11:22:36 -0500129 pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar), intsize);
Grant Likely7dc2e112010-06-08 07:48:06 -0600130
Grant Likely23616132013-09-15 22:32:39 +0100131 if (out_irq->args_count != intsize)
Grant Likely7dc2e112010-06-08 07:48:06 -0600132 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
Grant Likely355e62f2013-11-02 00:11:02 -0700150 /* Range check so that the temporary buffer doesn't overflow */
151 if (WARN_ON(addrsize + intsize > MAX_PHANDLE_ARGS))
152 goto fail;
153
Grant Likely23616132013-09-15 22:32:39 +0100154 /* Precalculate the match array - this simplifies match loop */
155 for (i = 0; i < addrsize; i++)
Grant Likely78119fd2013-11-01 10:50:50 -0700156 initial_match_array[i] = addr ? addr[i] : 0;
Grant Likely23616132013-09-15 22:32:39 +0100157 for (i = 0; i < intsize; i++)
158 initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]);
159
Grant Likely7dc2e112010-06-08 07:48:06 -0600160 /* Now start the actual "proper" walk of the interrupt tree */
161 while (ipar != NULL) {
162 /* Now check if cursor is an interrupt-controller and if it is
163 * then we are done
164 */
165 if (of_get_property(ipar, "interrupt-controller", NULL) !=
166 NULL) {
167 pr_debug(" -> got it !\n");
Grant Likely7dc2e112010-06-08 07:48:06 -0600168 return 0;
169 }
170
Grant Likely78119fd2013-11-01 10:50:50 -0700171 /*
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
Grant Likely7dc2e112010-06-08 07:48:06 -0600180 /* Now look for an interrupt-map */
181 imap = of_get_property(ipar, "interrupt-map", &imaplen);
182 /* No interrupt map, check for an interrupt parent */
183 if (imap == NULL) {
184 pr_debug(" -> no map, getting parent\n");
185 newpar = of_irq_find_parent(ipar);
186 goto skiplevel;
187 }
188 imaplen /= sizeof(u32);
189
190 /* Look for a mask */
191 imask = of_get_property(ipar, "interrupt-map-mask", NULL);
Grant Likely23616132013-09-15 22:32:39 +0100192 if (!imask)
193 imask = dummy_imask;
Grant Likely7dc2e112010-06-08 07:48:06 -0600194
195 /* Parse interrupt-map */
196 match = 0;
197 while (imaplen > (addrsize + intsize + 1) && !match) {
198 /* Compare specifiers */
199 match = 1;
Grant Likely23616132013-09-15 22:32:39 +0100200 for (i = 0; i < (addrsize + intsize); i++, imaplen--)
Tomasz Figa74dac2e2013-11-05 16:21:18 +0100201 match &= !((match_array[i] ^ *imap++) & imask[i]);
Grant Likely7dc2e112010-06-08 07:48:06 -0600202
203 pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
204
205 /* Get the interrupt parent */
206 if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
207 newpar = of_node_get(of_irq_dflt_pic);
208 else
Grant Likely9a6b2e52010-07-23 01:48:25 -0600209 newpar = of_find_node_by_phandle(be32_to_cpup(imap));
Grant Likely7dc2e112010-06-08 07:48:06 -0600210 imap++;
211 --imaplen;
212
213 /* Check if not found */
214 if (newpar == NULL) {
215 pr_debug(" -> imap parent not found !\n");
216 goto fail;
217 }
218
Peter Crosthwaite1ca56e72013-11-27 23:26:12 -0800219 if (!of_device_is_available(newpar))
220 match = 0;
221
Grant Likely7dc2e112010-06-08 07:48:06 -0600222 /* Get #interrupt-cells and #address-cells of new
223 * parent
224 */
225 tmp = of_get_property(newpar, "#interrupt-cells", NULL);
226 if (tmp == NULL) {
227 pr_debug(" -> parent lacks #interrupt-cells!\n");
228 goto fail;
229 }
Rob Herringa7c194b2010-06-08 07:48:08 -0600230 newintsize = be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600231 tmp = of_get_property(newpar, "#address-cells", NULL);
Rob Herringa7c194b2010-06-08 07:48:08 -0600232 newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600233
234 pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
235 newintsize, newaddrsize);
236
237 /* Check for malformed properties */
Grant Likely355e62f2013-11-02 00:11:02 -0700238 if (WARN_ON(newaddrsize + newintsize > MAX_PHANDLE_ARGS))
239 goto fail;
Grant Likely7dc2e112010-06-08 07:48:06 -0600240 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
Grant Likely23616132013-09-15 22:32:39 +0100251 /*
252 * Successfully parsed an interrrupt-map translation; copy new
253 * interrupt specifier into the out_irq structure
254 */
Cédric Le Goater2f53a712013-12-17 18:32:53 +0100255 out_irq->np = newpar;
Grant Likely23616132013-09-15 22:32:39 +0100256
257 match_array = imap - newaddrsize - newintsize;
258 for (i = 0; i < newintsize; i++)
259 out_irq->args[i] = be32_to_cpup(imap - newintsize + i);
260 out_irq->args_count = intsize = newintsize;
Grant Likely7dc2e112010-06-08 07:48:06 -0600261 addrsize = newaddrsize;
Grant Likely7dc2e112010-06-08 07:48:06 -0600262
263 skiplevel:
264 /* Iterate again with new parent */
Grant Likely74a7f082012-06-15 11:50:25 -0600265 pr_debug(" -> new parent: %s\n", of_node_full_name(newpar));
Grant Likely7dc2e112010-06-08 07:48:06 -0600266 of_node_put(ipar);
267 ipar = newpar;
268 newpar = NULL;
269 }
270 fail:
271 of_node_put(ipar);
Grant Likely7dc2e112010-06-08 07:48:06 -0600272 of_node_put(newpar);
273
274 return -EINVAL;
275}
Grant Likely0c02c802013-09-19 11:22:36 -0500276EXPORT_SYMBOL_GPL(of_irq_parse_raw);
Grant Likely7dc2e112010-06-08 07:48:06 -0600277
278/**
Grant Likely0c02c802013-09-19 11:22:36 -0500279 * of_irq_parse_one - Resolve an interrupt for a device
Grant Likely7dc2e112010-06-08 07:48:06 -0600280 * @device: the device whose interrupt is to be resolved
281 * @index: index of the interrupt to resolve
282 * @out_irq: structure of_irq filled by this function
283 *
Grant Likely23616132013-09-15 22:32:39 +0100284 * This function resolves an interrupt for a node by walking the interrupt tree,
285 * finding which interrupt controller node it is attached to, and returning the
286 * interrupt specifier that can be used to retrieve a Linux IRQ number.
Grant Likely7dc2e112010-06-08 07:48:06 -0600287 */
Grant Likely530210c2013-09-15 16:39:11 +0100288int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq)
Grant Likely7dc2e112010-06-08 07:48:06 -0600289{
290 struct device_node *p;
Grant Likelyd2f71832010-07-23 16:56:19 -0600291 const __be32 *intspec, *tmp, *addr;
Grant Likely7dc2e112010-06-08 07:48:06 -0600292 u32 intsize, intlen;
Grant Likely23616132013-09-15 22:32:39 +0100293 int i, res = -EINVAL;
Grant Likely7dc2e112010-06-08 07:48:06 -0600294
Grant Likely0c02c802013-09-19 11:22:36 -0500295 pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device), index);
Grant Likely7dc2e112010-06-08 07:48:06 -0600296
297 /* OldWorld mac stuff is "special", handle out of line */
298 if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
Grant Likely0c02c802013-09-19 11:22:36 -0500299 return of_irq_parse_oldworld(device, index, out_irq);
Grant Likely7dc2e112010-06-08 07:48:06 -0600300
Grant Likely79d97012013-09-19 16:47:37 -0500301 /* Get the reg property (if any) */
302 addr = of_get_property(device, "reg", NULL);
303
Florian Fainellia9ecdc02014-08-06 13:02:27 -0700304 /* Try the new-style interrupts-extended first */
305 res = of_parse_phandle_with_args(device, "interrupts-extended",
306 "#interrupt-cells", index, out_irq);
307 if (!res)
308 return of_irq_parse_raw(addr, out_irq);
309
Grant Likely7dc2e112010-06-08 07:48:06 -0600310 /* Get the interrupts property */
311 intspec = of_get_property(device, "interrupts", &intlen);
Florian Fainellia9ecdc02014-08-06 13:02:27 -0700312 if (intspec == NULL)
313 return -EINVAL;
314
Grant Likelyd2f71832010-07-23 16:56:19 -0600315 intlen /= sizeof(*intspec);
Grant Likely7dc2e112010-06-08 07:48:06 -0600316
Grant Likelyd2f71832010-07-23 16:56:19 -0600317 pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);
Grant Likely7dc2e112010-06-08 07:48:06 -0600318
Grant Likely7dc2e112010-06-08 07:48:06 -0600319 /* Look for the interrupt parent. */
320 p = of_irq_find_parent(device);
321 if (p == NULL)
322 return -EINVAL;
323
324 /* Get size of interrupt specifier */
325 tmp = of_get_property(p, "#interrupt-cells", NULL);
326 if (tmp == NULL)
327 goto out;
Rob Herringa7c194b2010-06-08 07:48:08 -0600328 intsize = be32_to_cpu(*tmp);
Grant Likely7dc2e112010-06-08 07:48:06 -0600329
330 pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
331
332 /* Check index */
333 if ((index + 1) * intsize > intlen)
334 goto out;
335
Grant Likely23616132013-09-15 22:32:39 +0100336 /* Copy intspec into irq structure */
337 intspec += index * intsize;
338 out_irq->np = p;
339 out_irq->args_count = intsize;
340 for (i = 0; i < intsize; i++)
341 out_irq->args[i] = be32_to_cpup(intspec++);
342
343 /* Check if there are any interrupt-map translations to process */
344 res = of_irq_parse_raw(addr, out_irq);
Grant Likely7dc2e112010-06-08 07:48:06 -0600345 out:
346 of_node_put(p);
347 return res;
348}
Grant Likely0c02c802013-09-19 11:22:36 -0500349EXPORT_SYMBOL_GPL(of_irq_parse_one);
Grant Likely7dc2e112010-06-08 07:48:06 -0600350
351/**
352 * of_irq_to_resource - Decode a node's IRQ and return it as a resource
353 * @dev: pointer to device tree node
354 * @index: zero-based index of the irq
355 * @r: pointer to resource structure to return result into.
356 */
357int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
358{
359 int irq = irq_of_parse_and_map(dev, index);
360
361 /* Only dereference the resource if both the
362 * resource and the irq are valid. */
Anton Vorontsov77a73002011-12-07 03:16:26 +0400363 if (r && irq) {
Benoit Cousson661db792011-12-05 15:23:56 +0100364 const char *name = NULL;
365
Sebastian Andrzej Siewiorcf9e2362013-07-18 12:24:10 +0200366 memset(r, 0, sizeof(*r));
Benoit Cousson661db792011-12-05 15:23:56 +0100367 /*
Geert Uytterhoevenae107d02014-04-22 20:40:25 +0200368 * Get optional "interrupt-names" property to add a name
Benoit Cousson661db792011-12-05 15:23:56 +0100369 * to the resource.
370 */
371 of_property_read_string_index(dev, "interrupt-names", index,
372 &name);
373
Grant Likely7dc2e112010-06-08 07:48:06 -0600374 r->start = r->end = irq;
Tomasz Figa4a43d682013-09-28 19:52:51 +0200375 r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq));
Grant Likely88048272013-09-19 11:01:52 -0500376 r->name = name ? name : of_node_full_name(dev);
Grant Likely7dc2e112010-06-08 07:48:06 -0600377 }
378
379 return irq;
380}
381EXPORT_SYMBOL_GPL(of_irq_to_resource);
Andres Salomon52f65372010-10-10 21:35:05 -0600382
383/**
Rob Herring9ec36ca2014-04-23 17:57:41 -0500384 * of_irq_get - Decode a node's IRQ and return it as a Linux irq number
385 * @dev: pointer to device tree node
386 * @index: zero-based index of the irq
387 *
388 * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
389 * is not yet created.
390 *
391 */
392int of_irq_get(struct device_node *dev, int index)
393{
394 int rc;
395 struct of_phandle_args oirq;
396 struct irq_domain *domain;
397
398 rc = of_irq_parse_one(dev, index, &oirq);
399 if (rc)
400 return rc;
401
402 domain = irq_find_host(oirq.np);
403 if (!domain)
404 return -EPROBE_DEFER;
405
406 return irq_create_of_mapping(&oirq);
407}
Laurent Pinchart9eb08fb2014-10-30 15:59:36 +0200408EXPORT_SYMBOL_GPL(of_irq_get);
Rob Herring9ec36ca2014-04-23 17:57:41 -0500409
410/**
Grygorii Strashkoad696742014-05-20 13:42:02 +0300411 * of_irq_get_byname - Decode a node's IRQ and return it as a Linux irq number
412 * @dev: pointer to device tree node
413 * @name: irq name
414 *
415 * Returns Linux irq number on success, or -EPROBE_DEFER if the irq domain
416 * is not yet created, or error code in case of any other failure.
417 */
418int of_irq_get_byname(struct device_node *dev, const char *name)
419{
420 int index;
421
422 if (unlikely(!name))
423 return -EINVAL;
424
425 index = of_property_match_string(dev, "interrupt-names", name);
426 if (index < 0)
427 return index;
428
429 return of_irq_get(dev, index);
430}
431
432/**
Andres Salomon52f65372010-10-10 21:35:05 -0600433 * of_irq_count - Count the number of IRQs a node uses
434 * @dev: pointer to device tree node
435 */
436int of_irq_count(struct device_node *dev)
437{
Thierry Reding3da52782013-09-18 15:24:43 +0200438 struct of_phandle_args irq;
Andres Salomon52f65372010-10-10 21:35:05 -0600439 int nr = 0;
440
Thierry Reding3da52782013-09-18 15:24:43 +0200441 while (of_irq_parse_one(dev, nr, &irq) == 0)
Andres Salomon52f65372010-10-10 21:35:05 -0600442 nr++;
443
444 return nr;
445}
446
447/**
448 * of_irq_to_resource_table - Fill in resource table with node's IRQ info
449 * @dev: pointer to device tree node
450 * @res: array of resources to fill in
451 * @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
452 *
453 * Returns the size of the filled in table (up to @nr_irqs).
454 */
455int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
456 int nr_irqs)
457{
458 int i;
459
460 for (i = 0; i < nr_irqs; i++, res++)
Anton Vorontsov77a73002011-12-07 03:16:26 +0400461 if (!of_irq_to_resource(dev, i, res))
Andres Salomon52f65372010-10-10 21:35:05 -0600462 break;
463
464 return i;
465}
John Crispina4f8bf22012-08-26 09:13:09 +0200466EXPORT_SYMBOL_GPL(of_irq_to_resource_table);
Rob Herringc71a54b2011-09-20 15:13:50 -0500467
468struct intc_desc {
469 struct list_head list;
470 struct device_node *dev;
471 struct device_node *interrupt_parent;
472};
473
474/**
475 * of_irq_init - Scan and init matching interrupt controllers in DT
476 * @matches: 0 terminated array of nodes to match and init function to call
477 *
478 * This function scans the device tree for matching interrupt controller nodes,
479 * and calls their initialization functions in order with parents first.
480 */
481void __init of_irq_init(const struct of_device_id *matches)
482{
483 struct device_node *np, *parent = NULL;
484 struct intc_desc *desc, *temp_desc;
485 struct list_head intc_desc_list, intc_parent_list;
486
487 INIT_LIST_HEAD(&intc_desc_list);
488 INIT_LIST_HEAD(&intc_parent_list);
489
490 for_each_matching_node(np, matches) {
Peter Crosthwaitebf49be02013-11-27 23:26:13 -0800491 if (!of_find_property(np, "interrupt-controller", NULL) ||
492 !of_device_is_available(np))
Rob Herringc71a54b2011-09-20 15:13:50 -0500493 continue;
494 /*
495 * Here, we allocate and populate an intc_desc with the node
496 * pointer, interrupt-parent device_node etc.
497 */
498 desc = kzalloc(sizeof(*desc), GFP_KERNEL);
499 if (WARN_ON(!desc))
500 goto err;
501
502 desc->dev = np;
503 desc->interrupt_parent = of_irq_find_parent(np);
Rob Herringd7fb6d02011-11-27 20:16:33 -0600504 if (desc->interrupt_parent == np)
505 desc->interrupt_parent = NULL;
Rob Herringc71a54b2011-09-20 15:13:50 -0500506 list_add_tail(&desc->list, &intc_desc_list);
507 }
508
509 /*
510 * The root irq controller is the one without an interrupt-parent.
511 * That one goes first, followed by the controllers that reference it,
512 * followed by the ones that reference the 2nd level controllers, etc.
513 */
514 while (!list_empty(&intc_desc_list)) {
515 /*
516 * Process all controllers with the current 'parent'.
517 * First pass will be looking for NULL as the parent.
518 * The assumption is that NULL parent means a root controller.
519 */
520 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
521 const struct of_device_id *match;
522 int ret;
523 of_irq_init_cb_t irq_init_cb;
524
525 if (desc->interrupt_parent != parent)
526 continue;
527
528 list_del(&desc->list);
529 match = of_match_node(matches, desc->dev);
530 if (WARN(!match->data,
531 "of_irq_init: no init function for %s\n",
532 match->compatible)) {
533 kfree(desc);
534 continue;
535 }
536
537 pr_debug("of_irq_init: init %s @ %p, parent %p\n",
538 match->compatible,
539 desc->dev, desc->interrupt_parent);
Kim Phillipsd2e41512012-10-08 19:42:04 -0500540 irq_init_cb = (of_irq_init_cb_t)match->data;
Rob Herringc71a54b2011-09-20 15:13:50 -0500541 ret = irq_init_cb(desc->dev, desc->interrupt_parent);
542 if (ret) {
543 kfree(desc);
544 continue;
545 }
546
547 /*
548 * This one is now set up; add it to the parent list so
549 * its children can get processed in a subsequent pass.
550 */
551 list_add_tail(&desc->list, &intc_parent_list);
552 }
553
554 /* Get the next pending parent that might have children */
Axel Linc0cdfaa2013-06-23 15:50:07 +0800555 desc = list_first_entry_or_null(&intc_parent_list,
556 typeof(*desc), list);
557 if (!desc) {
Rob Herringc71a54b2011-09-20 15:13:50 -0500558 pr_err("of_irq_init: children remain, but no parents\n");
559 break;
560 }
561 list_del(&desc->list);
562 parent = desc->dev;
563 kfree(desc);
564 }
565
566 list_for_each_entry_safe(desc, temp_desc, &intc_parent_list, list) {
567 list_del(&desc->list);
568 kfree(desc);
569 }
570err:
571 list_for_each_entry_safe(desc, temp_desc, &intc_desc_list, list) {
572 list_del(&desc->list);
573 kfree(desc);
574 }
575}