[net-next-2.6.git] / drivers / of / irq.c

/*
 *  Derived from arch/i386/kernel/irq.c
 *    Copyright (C) 1992 Linus Torvalds
 *  Adapted from arch/i386 by Gary Thomas
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
 *    Copyright (C) 1996-2001 Cort Dougan
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * This file contains the code used to make IRQ descriptions in the
 * device tree to actual irq numbers on an interrupt controller
 * driver.
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/string.h>

/* For archs that don't support NO_IRQ (such as x86), provide a dummy value */
#ifndef NO_IRQ
#define NO_IRQ 0
#endif

/**
 * irq_of_parse_and_map - Parse and map an interrupt into linux virq space
 * @device: Device node of the device whose interrupt is to be mapped
 * @index: Index of the interrupt to map
 *
 * This function is a wrapper that chains of_irq_map_one() and
 * irq_create_of_mapping() to make things easier to callers
 */
unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
{
	struct of_irq oirq;

	if (of_irq_map_one(dev, index, &oirq))
		return NO_IRQ;

	return irq_create_of_mapping(oirq.controller, oirq.specifier,
				     oirq.size);
}
EXPORT_SYMBOL_GPL(irq_of_parse_and_map);

/**
 * of_irq_find_parent - Given a device node, find its interrupt parent node
 * @child: pointer to device node
 *
 * Returns a pointer to the interrupt parent node, or NULL if the interrupt
 * parent could not be determined.
 */
static struct device_node *of_irq_find_parent(struct device_node *child)
{
	struct device_node *p;
	const __be32 *parp;

	if (!of_node_get(child))
		return NULL;

	do {
		parp = of_get_property(child, "interrupt-parent", NULL);
		if (parp == NULL)
			p = of_get_parent(child);
		else {
			if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
				p = of_node_get(of_irq_dflt_pic);
			else
				p = of_find_node_by_phandle(be32_to_cpup(parp));
		}
		of_node_put(child);
		child = p;
	} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);

	return p;
}

/**
 * of_irq_map_raw - Low level interrupt tree parsing
 * @parent:	the device interrupt parent
 * @intspec:	interrupt specifier ("interrupts" property of the device)
 * @ointsize:   size of the passed in interrupt specifier
 * @addr:	address specifier (start of "reg" property of the device)
 * @out_irq:	structure of_irq filled by this function
 *
 * Returns 0 on success and a negative number on error
 *
 * This function is a low-level interrupt tree walking function. It
 * can be used to do a partial walk with synthetized reg and interrupts
 * properties, for example when resolving PCI interrupts when no device
 * node exist for the parent.
 */
int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
		   u32 ointsize, const __be32 *addr, struct of_irq *out_irq)
{
	struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
	const __be32 *tmp, *imap, *imask;
	u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
	int imaplen, match, i;

	pr_debug("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
		 parent->full_name, be32_to_cpup(intspec),
		 be32_to_cpup(intspec + 1), ointsize);

	ipar = of_node_get(parent);

	/* First get the #interrupt-cells property of the current cursor
	 * that tells us how to interpret the passed-in intspec. If there
	 * is none, we are nice and just walk up the tree
	 */
	do {
		tmp = of_get_property(ipar, "#interrupt-cells", NULL);
		if (tmp != NULL) {
			intsize = be32_to_cpu(*tmp);
			break;
		}
		tnode = ipar;
		ipar = of_irq_find_parent(ipar);
		of_node_put(tnode);
	} while (ipar);
	if (ipar == NULL) {
		pr_debug(" -> no parent found !\n");
		goto fail;
	}

	pr_debug("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);

	if (ointsize != intsize)
		return -EINVAL;

	/* Look for this #address-cells. We have to implement the old linux
	 * trick of looking for the parent here as some device-trees rely on it
	 */
	old = of_node_get(ipar);
	do {
		tmp = of_get_property(old, "#address-cells", NULL);
		tnode = of_get_parent(old);
		of_node_put(old);
		old = tnode;
	} while (old && tmp == NULL);
	of_node_put(old);
	old = NULL;
	addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp);

	pr_debug(" -> addrsize=%d\n", addrsize);

	/* Now start the actual "proper" walk of the interrupt tree */
	while (ipar != NULL) {
		/* Now check if cursor is an interrupt-controller and if it is
		 * then we are done
		 */
		if (of_get_property(ipar, "interrupt-controller", NULL) !=
				NULL) {
			pr_debug(" -> got it !\n");
			for (i = 0; i < intsize; i++)
				out_irq->specifier[i] =
						of_read_number(intspec +i, 1);
			out_irq->size = intsize;
			out_irq->controller = ipar;
			of_node_put(old);
			return 0;
		}

		/* Now look for an interrupt-map */
		imap = of_get_property(ipar, "interrupt-map", &imaplen);
		/* No interrupt map, check for an interrupt parent */
		if (imap == NULL) {
			pr_debug(" -> no map, getting parent\n");
			newpar = of_irq_find_parent(ipar);
			goto skiplevel;
		}
		imaplen /= sizeof(u32);

		/* Look for a mask */
		imask = of_get_property(ipar, "interrupt-map-mask", NULL);

		/* If we were passed no "reg" property and we attempt to parse
		 * an interrupt-map, then #address-cells must be 0.
		 * Fail if it's not.
		 */
		if (addr == NULL && addrsize != 0) {
			pr_debug(" -> no reg passed in when needed !\n");
			goto fail;
		}

		/* Parse interrupt-map */
		match = 0;
		while (imaplen > (addrsize + intsize + 1) && !match) {
			/* Compare specifiers */
			match = 1;
			for (i = 0; i < addrsize && match; ++i) {
				u32 mask = imask ? imask[i] : 0xffffffffu;
				match = ((addr[i] ^ imap[i]) & mask) == 0;
			}
			for (; i < (addrsize + intsize) && match; ++i) {
				u32 mask = imask ? imask[i] : 0xffffffffu;
				match =
				   ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
			}
			imap += addrsize + intsize;
			imaplen -= addrsize + intsize;

			pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);

			/* Get the interrupt parent */
			if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
				newpar = of_node_get(of_irq_dflt_pic);
			else
				newpar = of_find_node_by_phandle(be32_to_cpup(imap));
			imap++;
			--imaplen;

			/* Check if not found */
			if (newpar == NULL) {
				pr_debug(" -> imap parent not found !\n");
				goto fail;
			}

			/* Get #interrupt-cells and #address-cells of new
			 * parent
			 */
			tmp = of_get_property(newpar, "#interrupt-cells", NULL);
			if (tmp == NULL) {
				pr_debug(" -> parent lacks #interrupt-cells!\n");
				goto fail;
			}
			newintsize = be32_to_cpu(*tmp);
			tmp = of_get_property(newpar, "#address-cells", NULL);
			newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);

			pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
			    newintsize, newaddrsize);

			/* Check for malformed properties */
			if (imaplen < (newaddrsize + newintsize))
				goto fail;

			imap += newaddrsize + newintsize;
			imaplen -= newaddrsize + newintsize;

			pr_debug(" -> imaplen=%d\n", imaplen);
		}
		if (!match)
			goto fail;

		of_node_put(old);
		old = of_node_get(newpar);
		addrsize = newaddrsize;
		intsize = newintsize;
		intspec = imap - intsize;
		addr = intspec - addrsize;

	skiplevel:
		/* Iterate again with new parent */
		pr_debug(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
		of_node_put(ipar);
		ipar = newpar;
		newpar = NULL;
	}
 fail:
	of_node_put(ipar);
	of_node_put(old);
	of_node_put(newpar);

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(of_irq_map_raw);

/**
 * of_irq_map_one - Resolve an interrupt for a device
 * @device: the device whose interrupt is to be resolved
 * @index: index of the interrupt to resolve
 * @out_irq: structure of_irq filled by this function
 *
 * This function resolves an interrupt, walking the tree, for a given
 * device-tree node. It's the high level pendant to of_irq_map_raw().
 */
int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
{
	struct device_node *p;
	const __be32 *intspec, *tmp, *addr;
	u32 intsize, intlen;
	int res = -EINVAL;

	pr_debug("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);

	/* OldWorld mac stuff is "special", handle out of line */
	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
		return of_irq_map_oldworld(device, index, out_irq);

	/* Get the interrupts property */
	intspec = of_get_property(device, "interrupts", &intlen);
	if (intspec == NULL)
		return -EINVAL;
	intlen /= sizeof(*intspec);

	pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);

	/* Get the reg property (if any) */
	addr = of_get_property(device, "reg", NULL);

	/* Look for the interrupt parent. */
	p = of_irq_find_parent(device);
	if (p == NULL)
		return -EINVAL;

	/* Get size of interrupt specifier */
	tmp = of_get_property(p, "#interrupt-cells", NULL);
	if (tmp == NULL)
		goto out;
	intsize = be32_to_cpu(*tmp);

	pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);

	/* Check index */
	if ((index + 1) * intsize > intlen)
		goto out;

	/* Get new specifier and map it */
	res = of_irq_map_raw(p, intspec + index * intsize, intsize,
			     addr, out_irq);
 out:
	of_node_put(p);
	return res;
}
EXPORT_SYMBOL_GPL(of_irq_map_one);

/**
 * of_irq_to_resource - Decode a node's IRQ and return it as a resource
 * @dev: pointer to device tree node
 * @index: zero-based index of the irq
 * @r: pointer to resource structure to return result into.
 */
int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
{
	int irq = irq_of_parse_and_map(dev, index);

	/* Only dereference the resource if both the
	 * resource and the irq are valid. */
	if (r && irq != NO_IRQ) {
		r->start = r->end = irq;
		r->flags = IORESOURCE_IRQ;
		r->name = dev->full_name;
	}

	return irq;
}
EXPORT_SYMBOL_GPL(of_irq_to_resource);

/**
 * of_irq_count - Count the number of IRQs a node uses
 * @dev: pointer to device tree node
 */
int of_irq_count(struct device_node *dev)
{
	int nr = 0;

	while (of_irq_to_resource(dev, nr, NULL) != NO_IRQ)
		nr++;

	return nr;
}

/**
 * of_irq_to_resource_table - Fill in resource table with node's IRQ info
 * @dev: pointer to device tree node
 * @res: array of resources to fill in
 * @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
 *
 * Returns the size of the filled in table (up to @nr_irqs).
 */
int of_irq_to_resource_table(struct device_node *dev, struct resource *res,
		int nr_irqs)
{
	int i;

	for (i = 0; i < nr_irqs; i++, res++)
		if (of_irq_to_resource(dev, i, res) == NO_IRQ)
			break;

	return i;
}
Commit	Line	Data
e3873444 GL	1	/*
	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>
	22	#include <linux/module.h>
	23	#include <linux/of.h>
	24	#include <linux/of_irq.h>
	25	#include <linux/string.h>
	26
52f6537c AS	27	/* For archs that don't support NO_IRQ (such as x86), provide a dummy value */
	28	#ifndef NO_IRQ
	29	#define NO_IRQ 0
	30	#endif
	31
e3873444 GL	32	/**
	33	* irq_of_parse_and_map - Parse and map an interrupt into linux virq space
	34	* @device: Device node of the device whose interrupt is to be mapped
	35	* @index: Index of the interrupt to map
	36	*
	37	* This function is a wrapper that chains of_irq_map_one() and
	38	* irq_create_of_mapping() to make things easier to callers
	39	*/
	40	unsigned int irq_of_parse_and_map(struct device_node *dev, int index)
	41	{
	42	struct of_irq oirq;
	43
	44	if (of_irq_map_one(dev, index, &oirq))
	45	return NO_IRQ;
	46
	47	return irq_create_of_mapping(oirq.controller, oirq.specifier,
	48	oirq.size);
	49	}
	50	EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
7dc2e113 GL	51
	52	/**
	53	* of_irq_find_parent - Given a device node, find its interrupt parent node
	54	* @child: pointer to device node
	55	*
	56	* Returns a pointer to the interrupt parent node, or NULL if the interrupt
	57	* parent could not be determined.
	58	*/
	59	static struct device_node of_irq_find_parent(struct device_node child)
	60	{
	61	struct device_node *p;
9a6b2e58	62	const __be32 *parp;
7dc2e113 GL	63
	64	if (!of_node_get(child))
	65	return NULL;
	66
	67	do {
	68	parp = of_get_property(child, "interrupt-parent", NULL);
	69	if (parp == NULL)
	70	p = of_get_parent(child);
	71	else {
	72	if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
	73	p = of_node_get(of_irq_dflt_pic);
	74	else
9a6b2e58	75	p = of_find_node_by_phandle(be32_to_cpup(parp));
7dc2e113 GL	76	}
	77	of_node_put(child);
	78	child = p;
	79	} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);
	80
	81	return p;
	82	}
	83
	84	/**
	85	* of_irq_map_raw - Low level interrupt tree parsing
	86	* @parent: the device interrupt parent
	87	* @intspec: interrupt specifier ("interrupts" property of the device)
	88	* @ointsize: size of the passed in interrupt specifier
	89	* @addr: address specifier (start of "reg" property of the device)
	90	* @out_irq: structure of_irq filled by this function
	91	*
	92	* Returns 0 on success and a negative number on error
	93	*
	94	* This function is a low-level interrupt tree walking function. It
	95	* can be used to do a partial walk with synthetized reg and interrupts
	96	* properties, for example when resolving PCI interrupts when no device
	97	* node exist for the parent.
	98	*/
d2f71839 GL	99	int of_irq_map_raw(struct device_node parent, const __be32 intspec,
d2f71839 GL	100	u32 ointsize, const __be32 addr, struct of_irq out_irq)
7dc2e113 GL	101	{
7dc2e113 GL	102	struct device_node ipar, tnode, old = NULL, newpar = NULL;
a7c194b0	103	const __be32 tmp, imap, *imask;
7dc2e113 GL	104	u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
	105	int imaplen, match, i;
	106
	107	pr_debug("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
d2f71839 GL	108	parent->full_name, be32_to_cpup(intspec),
d2f71839 GL	109	be32_to_cpup(intspec + 1), ointsize);
7dc2e113 GL	110
	111	ipar = of_node_get(parent);
	112
	113	/* First get the #interrupt-cells property of the current cursor
	114	* that tells us how to interpret the passed-in intspec. If there
	115	* is none, we are nice and just walk up the tree
	116	*/
	117	do {
	118	tmp = of_get_property(ipar, "#interrupt-cells", NULL);
	119	if (tmp != NULL) {
a7c194b0	120	intsize = be32_to_cpu(*tmp);
7dc2e113 GL	121	break;
	122	}
	123	tnode = ipar;
	124	ipar = of_irq_find_parent(ipar);
	125	of_node_put(tnode);
	126	} while (ipar);
	127	if (ipar == NULL) {
	128	pr_debug(" -> no parent found !\n");
	129	goto fail;
	130	}
	131
	132	pr_debug("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);
	133
	134	if (ointsize != intsize)
	135	return -EINVAL;
	136
	137	/* Look for this #address-cells. We have to implement the old linux
	138	* trick of looking for the parent here as some device-trees rely on it
	139	*/
	140	old = of_node_get(ipar);
	141	do {
	142	tmp = of_get_property(old, "#address-cells", NULL);
	143	tnode = of_get_parent(old);
	144	of_node_put(old);
	145	old = tnode;
	146	} while (old && tmp == NULL);
	147	of_node_put(old);
	148	old = NULL;
a7c194b0	149	addrsize = (tmp == NULL) ? 2 : be32_to_cpu(*tmp);
7dc2e113 GL	150
	151	pr_debug(" -> addrsize=%d\n", addrsize);
	152
	153	/* Now start the actual "proper" walk of the interrupt tree */
	154	while (ipar != NULL) {
	155	/* Now check if cursor is an interrupt-controller and if it is
	156	* then we are done
	157	*/
	158	if (of_get_property(ipar, "interrupt-controller", NULL) !=
	159	NULL) {
	160	pr_debug(" -> got it !\n");
a7c194b0 RH	161	for (i = 0; i < intsize; i++)
	162	out_irq->specifier[i] =
	163	of_read_number(intspec +i, 1);
7dc2e113 GL	164	out_irq->size = intsize;
	165	out_irq->controller = ipar;
	166	of_node_put(old);
	167	return 0;
	168	}
	169
	170	/* Now look for an interrupt-map */
	171	imap = of_get_property(ipar, "interrupt-map", &imaplen);
	172	/* No interrupt map, check for an interrupt parent */
	173	if (imap == NULL) {
	174	pr_debug(" -> no map, getting parent\n");
	175	newpar = of_irq_find_parent(ipar);
	176	goto skiplevel;
	177	}
	178	imaplen /= sizeof(u32);
	179
	180	/* Look for a mask */
	181	imask = of_get_property(ipar, "interrupt-map-mask", NULL);
	182
	183	/* If we were passed no "reg" property and we attempt to parse
	184	* an interrupt-map, then #address-cells must be 0.
	185	* Fail if it's not.
	186	*/
	187	if (addr == NULL && addrsize != 0) {
	188	pr_debug(" -> no reg passed in when needed !\n");
	189	goto fail;
	190	}
	191
	192	/* Parse interrupt-map */
	193	match = 0;
	194	while (imaplen > (addrsize + intsize + 1) && !match) {
	195	/* Compare specifiers */
	196	match = 1;
	197	for (i = 0; i < addrsize && match; ++i) {
	198	u32 mask = imask ? imask[i] : 0xffffffffu;
	199	match = ((addr[i] ^ imap[i]) & mask) == 0;
	200	}
	201	for (; i < (addrsize + intsize) && match; ++i) {
	202	u32 mask = imask ? imask[i] : 0xffffffffu;
	203	match =
	204	((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
	205	}
	206	imap += addrsize + intsize;
	207	imaplen -= addrsize + intsize;
	208
	209	pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);
	210
	211	/* Get the interrupt parent */
	212	if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
	213	newpar = of_node_get(of_irq_dflt_pic);
	214	else
9a6b2e58	215	newpar = of_find_node_by_phandle(be32_to_cpup(imap));
7dc2e113 GL	216	imap++;
	217	--imaplen;
	218
	219	/* Check if not found */
	220	if (newpar == NULL) {
	221	pr_debug(" -> imap parent not found !\n");
	222	goto fail;
	223	}
	224
	225	/* Get #interrupt-cells and #address-cells of new
	226	* parent
	227	*/
	228	tmp = of_get_property(newpar, "#interrupt-cells", NULL);
	229	if (tmp == NULL) {
	230	pr_debug(" -> parent lacks #interrupt-cells!\n");
	231	goto fail;
	232	}
a7c194b0	233	newintsize = be32_to_cpu(*tmp);
7dc2e113	234	tmp = of_get_property(newpar, "#address-cells", NULL);
a7c194b0	235	newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
7dc2e113 GL	236
	237	pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
	238	newintsize, newaddrsize);
	239
	240	/* Check for malformed properties */
	241	if (imaplen < (newaddrsize + newintsize))
	242	goto fail;
	243
	244	imap += newaddrsize + newintsize;
	245	imaplen -= newaddrsize + newintsize;
	246
	247	pr_debug(" -> imaplen=%d\n", imaplen);
	248	}
	249	if (!match)
	250	goto fail;
	251
	252	of_node_put(old);
	253	old = of_node_get(newpar);
	254	addrsize = newaddrsize;
	255	intsize = newintsize;
	256	intspec = imap - intsize;
	257	addr = intspec - addrsize;
	258
	259	skiplevel:
	260	/* Iterate again with new parent */
	261	pr_debug(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
	262	of_node_put(ipar);
	263	ipar = newpar;
	264	newpar = NULL;
	265	}
	266	fail:
	267	of_node_put(ipar);
	268	of_node_put(old);
	269	of_node_put(newpar);
	270
	271	return -EINVAL;
	272	}
	273	EXPORT_SYMBOL_GPL(of_irq_map_raw);
	274
	275	/**
	276	* of_irq_map_one - Resolve an interrupt for a device
	277	* @device: the device whose interrupt is to be resolved
	278	* @index: index of the interrupt to resolve
	279	* @out_irq: structure of_irq filled by this function
	280	*
	281	* This function resolves an interrupt, walking the tree, for a given
	282	* device-tree node. It's the high level pendant to of_irq_map_raw().
	283	*/
	284	int of_irq_map_one(struct device_node device, int index, struct of_irq out_irq)
	285	{
	286	struct device_node *p;
d2f71839	287	const __be32 intspec, tmp, *addr;
7dc2e113 GL	288	u32 intsize, intlen;
	289	int res = -EINVAL;
	290
	291	pr_debug("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);
	292
	293	/* OldWorld mac stuff is "special", handle out of line */
	294	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
	295	return of_irq_map_oldworld(device, index, out_irq);
	296
	297	/* Get the interrupts property */
	298	intspec = of_get_property(device, "interrupts", &intlen);
	299	if (intspec == NULL)
	300	return -EINVAL;
d2f71839	301	intlen /= sizeof(*intspec);
7dc2e113	302
d2f71839	303	pr_debug(" intspec=%d intlen=%d\n", be32_to_cpup(intspec), intlen);
7dc2e113 GL	304
	305	/* Get the reg property (if any) */
	306	addr = of_get_property(device, "reg", NULL);
	307
	308	/* Look for the interrupt parent. */
	309	p = of_irq_find_parent(device);
	310	if (p == NULL)
	311	return -EINVAL;
	312
	313	/* Get size of interrupt specifier */
	314	tmp = of_get_property(p, "#interrupt-cells", NULL);
	315	if (tmp == NULL)
	316	goto out;
a7c194b0	317	intsize = be32_to_cpu(*tmp);
7dc2e113 GL	318
	319	pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);
	320
	321	/* Check index */
	322	if ((index + 1) * intsize > intlen)
	323	goto out;
	324
	325	/* Get new specifier and map it */
	326	res = of_irq_map_raw(p, intspec + index * intsize, intsize,
	327	addr, out_irq);
	328	out:
	329	of_node_put(p);
	330	return res;
	331	}
	332	EXPORT_SYMBOL_GPL(of_irq_map_one);
	333
	334	/**
	335	* of_irq_to_resource - Decode a node's IRQ and return it as a resource
	336	* @dev: pointer to device tree node
	337	* @index: zero-based index of the irq
	338	* @r: pointer to resource structure to return result into.
	339	*/
	340	int of_irq_to_resource(struct device_node dev, int index, struct resource r)
	341	{
	342	int irq = irq_of_parse_and_map(dev, index);
	343
	344	/* Only dereference the resource if both the
	345	* resource and the irq are valid. */
	346	if (r && irq != NO_IRQ) {
	347	r->start = r->end = irq;
	348	r->flags = IORESOURCE_IRQ;
d3571c3a	349	r->name = dev->full_name;
7dc2e113 GL	350	}
	351
	352	return irq;
	353	}
	354	EXPORT_SYMBOL_GPL(of_irq_to_resource);
52f6537c AS	355
	356	/**
	357	* of_irq_count - Count the number of IRQs a node uses
	358	* @dev: pointer to device tree node
	359	*/
	360	int of_irq_count(struct device_node *dev)
	361	{
	362	int nr = 0;
	363
	364	while (of_irq_to_resource(dev, nr, NULL) != NO_IRQ)
	365	nr++;
	366
	367	return nr;
	368	}
	369
	370	/**
	371	* of_irq_to_resource_table - Fill in resource table with node's IRQ info
	372	* @dev: pointer to device tree node
	373	* @res: array of resources to fill in
	374	* @nr_irqs: the number of IRQs (and upper bound for num of @res elements)
	375	*
	376	* Returns the size of the filled in table (up to @nr_irqs).
	377	*/
	378	int of_irq_to_resource_table(struct device_node dev, struct resource res,
	379	int nr_irqs)
	380	{
	381	int i;
	382
	383	for (i = 0; i < nr_irqs; i++, res++)
	384	if (of_irq_to_resource(dev, i, res) == NO_IRQ)
	385	break;
	386
	387	return i;
	388	}