5  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7  *    Copyright (C) 1996-2001 Cort Dougan
17  * device tree to actual irq numbers on an interrupt controller
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
50  * of_irq_find_parent - Given a device node, find its interrupt parent node
53  * Returns a pointer to the interrupt parent node, or NULL if the interrupt
54  * parent could not be determined.
65 		parp = of_get_property(child, "interrupt-parent", NULL);  in of_irq_find_parent()
76 	} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);  in of_irq_find_parent()
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
91  * This function is a low-level interrupt tree walking function. It
94  * node exist for the parent.
96 int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,  in of_irq_map_raw()  argument
105 		 parent->full_name, be32_to_cpup(intspec),  in of_irq_map_raw()
108 	ipar = of_node_get(parent);  in of_irq_map_raw()
110 	/* First get the #interrupt-cells property of the current cursor  in of_irq_map_raw()
111 	 * that tells us how to interpret the passed-in intspec. If there  in of_irq_map_raw()
115 		tmp = of_get_property(ipar, "#interrupt-cells", NULL);  in of_irq_map_raw()
125 		pr_debug(" -> no parent found !\n");  in of_irq_map_raw()
129 	pr_debug("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);  in of_irq_map_raw()
132 		return -EINVAL;  in of_irq_map_raw()
134 	/* Look for this #address-cells. We have to implement the old linux  in of_irq_map_raw()
135 	 * trick of looking for the parent here as some device-trees rely on it  in of_irq_map_raw()
139 		tmp = of_get_property(old, "#address-cells", NULL);  in of_irq_map_raw()
148 	pr_debug(" -> addrsize=%d\n", addrsize);  in of_irq_map_raw()
150 	/* Now start the actual "proper" walk of the interrupt tree */  in of_irq_map_raw()
152 		/* Now check if cursor is an interrupt-controller and if it is  in of_irq_map_raw()
155 		if (of_get_property(ipar, "interrupt-controller", NULL) !=  in of_irq_map_raw()
157 			pr_debug(" -> got it !\n");  in of_irq_map_raw()
159 				out_irq->specifier[i] =  in of_irq_map_raw()
161 			out_irq->size = intsize;  in of_irq_map_raw()
162 			out_irq->controller = ipar;  in of_irq_map_raw()
167 		/* Now look for an interrupt-map */  in of_irq_map_raw()
168 		imap = of_get_property(ipar, "interrupt-map", &imaplen);  in of_irq_map_raw()
169 		/* No interrupt map, check for an interrupt parent */  in of_irq_map_raw()
171 			pr_debug(" -> no map, getting parent\n");  in of_irq_map_raw()
178 		imask = of_get_property(ipar, "interrupt-map-mask", NULL);  in of_irq_map_raw()
181 		 * an interrupt-map, then #address-cells must be 0.  in of_irq_map_raw()
185 			pr_debug(" -> no reg passed in when needed !\n");  in of_irq_map_raw()
189 		/* Parse interrupt-map */  in of_irq_map_raw()
201 				   ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;  in of_irq_map_raw()
204 			imaplen -= addrsize + intsize;  in of_irq_map_raw()
206 			pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);  in of_irq_map_raw()
208 			/* Get the interrupt parent */  in of_irq_map_raw()
214 			--imaplen;  in of_irq_map_raw()
218 				pr_debug(" -> imap parent not found !\n");  in of_irq_map_raw()
222 			/* Get #interrupt-cells and #address-cells of new  in of_irq_map_raw()
223 			 * parent  in of_irq_map_raw()
225 			tmp = of_get_property(newpar, "#interrupt-cells", NULL);  in of_irq_map_raw()
227 				pr_debug(" -> parent lacks #interrupt-cells!\n");  in of_irq_map_raw()
231 			tmp = of_get_property(newpar, "#address-cells", NULL);  in of_irq_map_raw()
234 			pr_debug(" -> newintsize=%d, newaddrsize=%d\n",  in of_irq_map_raw()
242 			imaplen -= newaddrsize + newintsize;  in of_irq_map_raw()
244 			pr_debug(" -> imaplen=%d\n", imaplen);  in of_irq_map_raw()
253 		intspec = imap - intsize;  in of_irq_map_raw()
254 		addr = intspec - addrsize;  in of_irq_map_raw()
257 		/* Iterate again with new parent */  in of_irq_map_raw()
258 		pr_debug(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");  in of_irq_map_raw()
268 	return -EINVAL;  in of_irq_map_raw()
273  * of_irq_map_one - Resolve an interrupt for a device
274  * @device: the device whose interrupt is to be resolved
275  * @index: index of the interrupt to resolve
278  * This function resolves an interrupt, walking the tree, for a given
279  * device-tree node. It's the high level pendant to of_irq_map_raw().
286 	int res = -EINVAL;  in of_irq_map_one()
288 	pr_debug("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);  in of_irq_map_one()
297 		return -EINVAL;  in of_irq_map_one()
305 	/* Look for the interrupt parent. */  in of_irq_map_one()
308 		return -EINVAL;  in of_irq_map_one()
310 	/* Get size of interrupt specifier */  in of_irq_map_one()
311 	tmp = of_get_property(p, "#interrupt-cells", NULL);  in of_irq_map_one()
332  * of_irq_to_resource - Decode a node's IRQ and return it as a resource
334  * @index: zero-based index of the irq
347 		 * Get optional "interrupts-names" property to add a name  in of_irq_to_resource()
350 		of_property_read_string_index(dev, "interrupt-names", index,  in of_irq_to_resource()
353 		r->start = r->end = irq;  in of_irq_to_resource()
354 		r->flags = IORESOURCE_IRQ;  in of_irq_to_resource()
355 		r->name = name ? name : dev->full_name;  in of_irq_to_resource()
363  * of_irq_count - Count the number of IRQs a node uses
377  * of_irq_to_resource_table - Fill in resource table with node's IRQ info
403  * of_irq_init - Scan and init matching interrupt controllers in DT
406  * This function scans the device tree for matching interrupt controller nodes,
411 	struct device_node *np, *parent = NULL;  in of_irq_init()  local
419 		if (!of_find_property(np, "interrupt-controller", NULL))  in of_irq_init()
423 		 * pointer, interrupt-parent device_node etc.  in of_irq_init()
429 		desc->dev = np;  in of_irq_init()
430 		desc->interrupt_parent = of_irq_find_parent(np);  in of_irq_init()
431 		if (desc->interrupt_parent == np)  in of_irq_init()
432 			desc->interrupt_parent = NULL;  in of_irq_init()
433 		list_add_tail(&desc->list, &intc_desc_list);  in of_irq_init()
437 	 * The root irq controller is the one without an interrupt-parent.  in of_irq_init()
443 		 * Process all controllers with the current 'parent'.  in of_irq_init()
444 		 * First pass will be looking for NULL as the parent.  in of_irq_init()
445 		 * The assumption is that NULL parent means a root controller.  in of_irq_init()
452 			if (desc->interrupt_parent != parent)  in of_irq_init()
455 			list_del(&desc->list);  in of_irq_init()
456 			match = of_match_node(matches, desc->dev);  in of_irq_init()
457 			if (WARN(!match->data,  in of_irq_init()
459 			    match->compatible)) {  in of_irq_init()
464 			pr_debug("of_irq_init: init %s @ %p, parent %p\n",  in of_irq_init()
465 				 match->compatible,  in of_irq_init()
466 				 desc->dev, desc->interrupt_parent);  in of_irq_init()
467 			irq_init_cb = match->data;  in of_irq_init()
468 			ret = irq_init_cb(desc->dev, desc->interrupt_parent);  in of_irq_init()
475 			 * This one is now set up; add it to the parent list so  in of_irq_init()
478 			list_add_tail(&desc->list, &intc_parent_list);  in of_irq_init()
481 		/* Get the next pending parent that might have children */  in of_irq_init()
487 		list_del(&desc->list);  in of_irq_init()
488 		parent = desc->dev;  in of_irq_init()
493 		list_del(&desc->list);  in of_irq_init()
498 		list_del(&desc->list);  in of_irq_init()