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)
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.
16 * This file contains the code used to make IRQ descriptions in the
17 * device tree to actual irq numbers on an interrupt controller
21 #include <linux/errno.h>
22 #include <linux/list.h>
23 #include <linux/module.h>
25 #include <linux/of_irq.h>
26 #include <linux/string.h>
27 #include <linux/slab.h>
30 * irq_of_parse_and_map - Parse and map an interrupt into linux virq space
31 * @dev: Device node of the device whose interrupt is to be mapped
32 * @index: Index of the interrupt to map
34 * This function is a wrapper that chains of_irq_parse_one() and
35 * irq_create_of_mapping() to make things easier to callers
37 unsigned int irq_of_parse_and_map(struct device_node
*dev
, int index
)
39 struct of_phandle_args oirq
;
41 if (of_irq_parse_one(dev
, index
, &oirq
))
44 return irq_create_of_mapping(&oirq
);
46 EXPORT_SYMBOL_GPL(irq_of_parse_and_map
);
49 * of_irq_find_parent - Given a device node, find its interrupt parent node
50 * @child: pointer to device node
52 * Returns a pointer to the interrupt parent node, or NULL if the interrupt
53 * parent could not be determined.
55 struct device_node
*of_irq_find_parent(struct device_node
*child
)
57 struct device_node
*p
;
60 if (!of_node_get(child
))
64 parp
= of_get_property(child
, "interrupt-parent", NULL
);
66 p
= of_get_parent(child
);
68 if (of_irq_workarounds
& OF_IMAP_NO_PHANDLE
)
69 p
= of_node_get(of_irq_dflt_pic
);
71 p
= of_find_node_by_phandle(be32_to_cpup(parp
));
75 } while (p
&& of_get_property(p
, "#interrupt-cells", NULL
) == NULL
);
81 * of_irq_parse_raw - Low level interrupt tree parsing
82 * @parent: the device interrupt parent
83 * @addr: address specifier (start of "reg" property of the device) in be32 format
84 * @out_irq: structure of_irq updated by this function
86 * Returns 0 on success and a negative number on error
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
91 * 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.
95 int of_irq_parse_raw(const __be32
*addr
, struct of_phandle_args
*out_irq
)
97 struct device_node
*ipar
, *tnode
, *old
= NULL
, *newpar
= NULL
;
98 __be32 initial_match_array
[MAX_PHANDLE_ARGS
];
99 const __be32
*match_array
= initial_match_array
;
100 const __be32
*tmp
, *imap
, *imask
, dummy_imask
[] = { [0 ... MAX_PHANDLE_ARGS
] = ~0 };
101 u32 intsize
= 1, addrsize
, newintsize
= 0, newaddrsize
= 0;
102 int imaplen
, match
, i
;
105 of_print_phandle_args("of_irq_parse_raw: ", out_irq
);
108 ipar
= of_node_get(out_irq
->np
);
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
115 tmp
= of_get_property(ipar
, "#interrupt-cells", NULL
);
117 intsize
= be32_to_cpu(*tmp
);
121 ipar
= of_irq_find_parent(ipar
);
125 pr_debug(" -> no parent found !\n");
129 pr_debug("of_irq_parse_raw: ipar=%s, size=%d\n", of_node_full_name(ipar
), intsize
);
131 if (out_irq
->args_count
!= intsize
)
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
137 old
= of_node_get(ipar
);
139 tmp
= of_get_property(old
, "#address-cells", NULL
);
140 tnode
= of_get_parent(old
);
143 } while (old
&& tmp
== NULL
);
146 addrsize
= (tmp
== NULL
) ? 2 : be32_to_cpu(*tmp
);
148 pr_debug(" -> addrsize=%d\n", addrsize
);
150 /* Range check so that the temporary buffer doesn't overflow */
151 if (WARN_ON(addrsize
+ intsize
> MAX_PHANDLE_ARGS
))
154 /* Precalculate the match array - this simplifies match loop */
155 for (i
= 0; i
< addrsize
; i
++)
156 initial_match_array
[i
] = addr
? addr
[i
] : 0;
157 for (i
= 0; i
< intsize
; i
++)
158 initial_match_array
[addrsize
+ i
] = cpu_to_be32(out_irq
->args
[i
]);
160 /* 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
165 if (of_get_property(ipar
, "interrupt-controller", NULL
) !=
167 pr_debug(" -> got it !\n");
173 * interrupt-map parsing does not work without a reg
174 * property when #address-cells != 0
176 if (addrsize
&& !addr
) {
177 pr_debug(" -> no reg passed in when needed !\n");
181 /* Now look for an interrupt-map */
182 imap
= of_get_property(ipar
, "interrupt-map", &imaplen
);
183 /* No interrupt map, check for an interrupt parent */
185 pr_debug(" -> no map, getting parent\n");
186 newpar
= of_irq_find_parent(ipar
);
189 imaplen
/= sizeof(u32
);
191 /* Look for a mask */
192 imask
= of_get_property(ipar
, "interrupt-map-mask", NULL
);
196 /* Parse interrupt-map */
198 while (imaplen
> (addrsize
+ intsize
+ 1) && !match
) {
199 /* Compare specifiers */
201 for (i
= 0; i
< (addrsize
+ intsize
); i
++, imaplen
--)
202 match
&= !((match_array
[i
] ^ *imap
++) & imask
[i
]);
204 pr_debug(" -> match=%d (imaplen=%d)\n", match
, imaplen
);
206 /* Get the interrupt parent */
207 if (of_irq_workarounds
& OF_IMAP_NO_PHANDLE
)
208 newpar
= of_node_get(of_irq_dflt_pic
);
210 newpar
= of_find_node_by_phandle(be32_to_cpup(imap
));
214 /* Check if not found */
215 if (newpar
== NULL
) {
216 pr_debug(" -> imap parent not found !\n");
220 /* Get #interrupt-cells and #address-cells of new
223 tmp
= of_get_property(newpar
, "#interrupt-cells", NULL
);
225 pr_debug(" -> parent lacks #interrupt-cells!\n");
228 newintsize
= be32_to_cpu(*tmp
);
229 tmp
= of_get_property(newpar
, "#address-cells", NULL
);
230 newaddrsize
= (tmp
== NULL
) ? 0 : be32_to_cpu(*tmp
);
232 pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
233 newintsize
, newaddrsize
);
235 /* Check for malformed properties */
236 if (WARN_ON(newaddrsize
+ newintsize
> MAX_PHANDLE_ARGS
))
238 if (imaplen
< (newaddrsize
+ newintsize
))
241 imap
+= newaddrsize
+ newintsize
;
242 imaplen
-= newaddrsize
+ newintsize
;
244 pr_debug(" -> imaplen=%d\n", imaplen
);
250 * Successfully parsed an interrrupt-map translation; copy new
251 * interrupt specifier into the out_irq structure
253 of_node_put(out_irq
->np
);
254 out_irq
->np
= of_node_get(newpar
);
256 match_array
= imap
- newaddrsize
- newintsize
;
257 for (i
= 0; i
< newintsize
; i
++)
258 out_irq
->args
[i
] = be32_to_cpup(imap
- newintsize
+ i
);
259 out_irq
->args_count
= intsize
= newintsize
;
260 addrsize
= newaddrsize
;
263 /* Iterate again with new parent */
264 pr_debug(" -> new parent: %s\n", of_node_full_name(newpar
));
271 of_node_put(out_irq
->np
);
276 EXPORT_SYMBOL_GPL(of_irq_parse_raw
);
279 * of_irq_parse_one - Resolve an interrupt for a device
280 * @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
284 * 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.
288 int of_irq_parse_one(struct device_node
*device
, int index
, struct of_phandle_args
*out_irq
)
290 struct device_node
*p
;
291 const __be32
*intspec
, *tmp
, *addr
;
293 int i
, res
= -EINVAL
;
295 pr_debug("of_irq_parse_one: dev=%s, index=%d\n", of_node_full_name(device
), index
);
297 /* OldWorld mac stuff is "special", handle out of line */
298 if (of_irq_workarounds
& OF_IMAP_OLDWORLD_MAC
)
299 return of_irq_parse_oldworld(device
, index
, out_irq
);
301 /* Get the reg property (if any) */
302 addr
= of_get_property(device
, "reg", NULL
);
304 /* Get the interrupts property */
305 intspec
= of_get_property(device
, "interrupts", &intlen
);
306 if (intspec
== NULL
) {
307 /* Try the new-style interrupts-extended */
308 res
= of_parse_phandle_with_args(device
, "interrupts-extended",
309 "#interrupt-cells", index
, out_irq
);
312 return of_irq_parse_raw(addr
, out_irq
);
314 intlen
/= sizeof(*intspec
);
316 pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec
), intlen
);
318 /* Look for the interrupt parent. */
319 p
= of_irq_find_parent(device
);
323 /* Get size of interrupt specifier */
324 tmp
= of_get_property(p
, "#interrupt-cells", NULL
);
327 intsize
= be32_to_cpu(*tmp
);
329 pr_debug(" intsize=%d intlen=%d\n", intsize
, intlen
);
332 if ((index
+ 1) * intsize
> intlen
)
335 /* Copy intspec into irq structure */
336 intspec
+= index
* intsize
;
338 out_irq
->args_count
= intsize
;
339 for (i
= 0; i
< intsize
; i
++)
340 out_irq
->args
[i
] = be32_to_cpup(intspec
++);
342 /* Check if there are any interrupt-map translations to process */
343 res
= of_irq_parse_raw(addr
, out_irq
);
348 EXPORT_SYMBOL_GPL(of_irq_parse_one
);
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.
356 int of_irq_to_resource(struct device_node
*dev
, int index
, struct resource
*r
)
358 int irq
= irq_of_parse_and_map(dev
, index
);
360 /* Only dereference the resource if both the
361 * resource and the irq are valid. */
363 const char *name
= NULL
;
365 memset(r
, 0, sizeof(*r
));
367 * Get optional "interrupts-names" property to add a name
370 of_property_read_string_index(dev
, "interrupt-names", index
,
373 r
->start
= r
->end
= irq
;
374 r
->flags
= IORESOURCE_IRQ
| irqd_get_trigger_type(irq_get_irq_data(irq
));
375 r
->name
= name
? name
: of_node_full_name(dev
);
380 EXPORT_SYMBOL_GPL(of_irq_to_resource
);
383 * of_irq_count - Count the number of IRQs a node uses
384 * @dev: pointer to device tree node
386 int of_irq_count(struct device_node
*dev
)
388 struct of_phandle_args irq
;
391 while (of_irq_parse_one(dev
, nr
, &irq
) == 0)
398 * of_irq_to_resource_table - Fill in resource table with node's IRQ info
399 * @dev: pointer to device tree node
400 * @res: array of resources to fill in
401 * @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
403 * Returns the size of the filled in table (up to @nr_irqs).
405 int of_irq_to_resource_table(struct device_node
*dev
, struct resource
*res
,
410 for (i
= 0; i
< nr_irqs
; i
++, res
++)
411 if (!of_irq_to_resource(dev
, i
, res
))
416 EXPORT_SYMBOL_GPL(of_irq_to_resource_table
);
419 struct list_head list
;
420 struct device_node
*dev
;
421 struct device_node
*interrupt_parent
;
425 * of_irq_init - Scan and init matching interrupt controllers in DT
426 * @matches: 0 terminated array of nodes to match and init function to call
428 * This function scans the device tree for matching interrupt controller nodes,
429 * and calls their initialization functions in order with parents first.
431 void __init
of_irq_init(const struct of_device_id
*matches
)
433 struct device_node
*np
, *parent
= NULL
;
434 struct intc_desc
*desc
, *temp_desc
;
435 struct list_head intc_desc_list
, intc_parent_list
;
437 INIT_LIST_HEAD(&intc_desc_list
);
438 INIT_LIST_HEAD(&intc_parent_list
);
440 for_each_matching_node(np
, matches
) {
441 if (!of_find_property(np
, "interrupt-controller", NULL
))
444 * Here, we allocate and populate an intc_desc with the node
445 * pointer, interrupt-parent device_node etc.
447 desc
= kzalloc(sizeof(*desc
), GFP_KERNEL
);
452 desc
->interrupt_parent
= of_irq_find_parent(np
);
453 if (desc
->interrupt_parent
== np
)
454 desc
->interrupt_parent
= NULL
;
455 list_add_tail(&desc
->list
, &intc_desc_list
);
459 * The root irq controller is the one without an interrupt-parent.
460 * That one goes first, followed by the controllers that reference it,
461 * followed by the ones that reference the 2nd level controllers, etc.
463 while (!list_empty(&intc_desc_list
)) {
465 * Process all controllers with the current 'parent'.
466 * First pass will be looking for NULL as the parent.
467 * The assumption is that NULL parent means a root controller.
469 list_for_each_entry_safe(desc
, temp_desc
, &intc_desc_list
, list
) {
470 const struct of_device_id
*match
;
472 of_irq_init_cb_t irq_init_cb
;
474 if (desc
->interrupt_parent
!= parent
)
477 list_del(&desc
->list
);
478 match
= of_match_node(matches
, desc
->dev
);
479 if (WARN(!match
->data
,
480 "of_irq_init: no init function for %s\n",
481 match
->compatible
)) {
486 pr_debug("of_irq_init: init %s @ %p, parent %p\n",
488 desc
->dev
, desc
->interrupt_parent
);
489 irq_init_cb
= (of_irq_init_cb_t
)match
->data
;
490 ret
= irq_init_cb(desc
->dev
, desc
->interrupt_parent
);
497 * This one is now set up; add it to the parent list so
498 * its children can get processed in a subsequent pass.
500 list_add_tail(&desc
->list
, &intc_parent_list
);
503 /* Get the next pending parent that might have children */
504 desc
= list_first_entry_or_null(&intc_parent_list
,
505 typeof(*desc
), list
);
507 pr_err("of_irq_init: children remain, but no parents\n");
510 list_del(&desc
->list
);
515 list_for_each_entry_safe(desc
, temp_desc
, &intc_parent_list
, list
) {
516 list_del(&desc
->list
);
520 list_for_each_entry_safe(desc
, temp_desc
, &intc_desc_list
, list
) {
521 list_del(&desc
->list
);