1 // SPDX-License-Identifier: GPL-2.0+
6  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
8  *    Copyright (C) 1996-2001 Cort Dougan
29  * irq_of_parse_and_map - Parse and map an interrupt into linux virq space
31  * @index: Index of the interrupt to map
48  * of_irq_find_parent - Given a device node, find its interrupt parent node
63 		if (of_property_read_u32(child, "interrupt-parent", &parent)) {  in of_irq_find_parent()
73 	} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);  in of_irq_find_parent()
80  * of_irq_parse_raw - Low level interrupt tree parsing
86  * This function is a low-level interrupt tree walking function. It
90  * input, walks the tree looking for any interrupt-map properties, translates
91  * the specifier for each map, and then returns the translated map.
100 	int imaplen, match, i, rc = -EINVAL;  in of_irq_parse_raw()
106 	ipar = of_node_get(out_irq->np);  in of_irq_parse_raw()
108 	/* First get the #interrupt-cells property of the current cursor  in of_irq_parse_raw()
109 	 * that tells us how to interpret the passed-in intspec. If there  in of_irq_parse_raw()
113 		if (!of_property_read_u32(ipar, "#interrupt-cells", &intsize))  in of_irq_parse_raw()
120 		pr_debug(" -> no parent found !\n");  in of_irq_parse_raw()
126 	if (out_irq->args_count != intsize)  in of_irq_parse_raw()
129 	/* Look for this #address-cells. We have to implement the old linux  in of_irq_parse_raw()
130 	 * trick of looking for the parent here as some device-trees rely on it  in of_irq_parse_raw()
134 		tmp = of_get_property(old, "#address-cells", NULL);  in of_irq_parse_raw()
143 	pr_debug(" -> addrsize=%d\n", addrsize);  in of_irq_parse_raw()
147 		rc = -EFAULT;  in of_irq_parse_raw()
151 	/* Precalculate the match array - this simplifies match loop */  in of_irq_parse_raw()
155 		initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]);  in of_irq_parse_raw()
159 		/* Now check if cursor is an interrupt-controller and if it is  in of_irq_parse_raw()
162 		if (of_property_read_bool(ipar, "interrupt-controller")) {  in of_irq_parse_raw()
163 			pr_debug(" -> got it !\n");  in of_irq_parse_raw()
168 		 * interrupt-map parsing does not work without a reg  in of_irq_parse_raw()
169 		 * property when #address-cells != 0  in of_irq_parse_raw()
172 			pr_debug(" -> no reg passed in when needed !\n");  in of_irq_parse_raw()
176 		/* Now look for an interrupt-map */  in of_irq_parse_raw()
177 		imap = of_get_property(ipar, "interrupt-map", &imaplen);  in of_irq_parse_raw()
178 		/* No interrupt map, check for an interrupt parent */  in of_irq_parse_raw()
180 			pr_debug(" -> no map, getting parent\n");  in of_irq_parse_raw()
187 		imask = of_get_property(ipar, "interrupt-map-mask", NULL);  in of_irq_parse_raw()
191 		/* Parse interrupt-map */  in of_irq_parse_raw()
196 			for (i = 0; i < (addrsize + intsize); i++, imaplen--)  in of_irq_parse_raw()
199 			pr_debug(" -> match=%d (imaplen=%d)\n", match, imaplen);  in of_irq_parse_raw()
207 			--imaplen;  in of_irq_parse_raw()
211 				pr_debug(" -> imap parent not found !\n");  in of_irq_parse_raw()
218 			/* Get #interrupt-cells and #address-cells of new  in of_irq_parse_raw()
221 			if (of_property_read_u32(newpar, "#interrupt-cells",  in of_irq_parse_raw()
223 				pr_debug(" -> parent lacks #interrupt-cells!\n");  in of_irq_parse_raw()
226 			if (of_property_read_u32(newpar, "#address-cells",  in of_irq_parse_raw()
230 			pr_debug(" -> newintsize=%d, newaddrsize=%d\n",  in of_irq_parse_raw()
236 				rc = -EFAULT;  in of_irq_parse_raw()
241 			imaplen -= newaddrsize + newintsize;  in of_irq_parse_raw()
243 			pr_debug(" -> imaplen=%d\n", imaplen);  in of_irq_parse_raw()
249 		 * Successfully parsed an interrrupt-map translation; copy new  in of_irq_parse_raw()
252 		match_array = imap - newaddrsize - newintsize;  in of_irq_parse_raw()
254 			out_irq->args[i] = be32_to_cpup(imap - newintsize + i);  in of_irq_parse_raw()
255 		out_irq->args_count = intsize = newintsize;  in of_irq_parse_raw()
260 		out_irq->np = newpar;  in of_irq_parse_raw()
261 		pr_debug(" -> new parent: %pOF\n", newpar);  in of_irq_parse_raw()
266 	rc = -ENOENT; /* No interrupt-map found */  in of_irq_parse_raw()
277  * of_irq_parse_one - Resolve an interrupt for a device
302 	/* Try the new-style interrupts-extended first */  in of_irq_parse_one()
303 	res = of_parse_phandle_with_args(device, "interrupts-extended",  in of_irq_parse_one()
304 					"#interrupt-cells", index, out_irq);  in of_irq_parse_one()
311 		return -EINVAL;  in of_irq_parse_one()
314 	if (of_property_read_u32(p, "#interrupt-cells", &intsize)) {  in of_irq_parse_one()
315 		res = -EINVAL;  in of_irq_parse_one()
322 	out_irq->np = p;  in of_irq_parse_one()
323 	out_irq->args_count = intsize;  in of_irq_parse_one()
327 						 out_irq->args + i);  in of_irq_parse_one()
332 	pr_debug(" intspec=%d\n", *out_irq->args);  in of_irq_parse_one()
335 	/* Check if there are any interrupt-map translations to process */  in of_irq_parse_one()
344  * of_irq_to_resource - Decode a node's IRQ and return it as a resource
346  * @index: zero-based index of the irq
363 		 * Get optional "interrupt-names" property to add a name  in of_irq_to_resource()
366 		of_property_read_string_index(dev, "interrupt-names", index,  in of_irq_to_resource()
369 		r->start = r->end = irq;  in of_irq_to_resource()
370 		r->flags = IORESOURCE_IRQ | irqd_get_trigger_type(irq_get_irq_data(irq));  in of_irq_to_resource()
371 		r->name = name ? name : of_node_full_name(dev);  in of_irq_to_resource()
379  * of_irq_get - Decode a node's IRQ and return it as a Linux IRQ number
381  * @index: zero-based index of the IRQ
384  * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
399 		return -EPROBE_DEFER;  in of_irq_get()
406  * of_irq_get_byname - Decode a node's IRQ and return it as a Linux IRQ number
411  * -EPROBE_DEFER if the IRQ domain is not yet created, or error code in case
419 		return -EINVAL;  in of_irq_get_byname()
421 	index = of_property_match_string(dev, "interrupt-names", name);  in of_irq_get_byname()
430  * of_irq_count - Count the number of IRQs a node uses
445  * of_irq_to_resource_table - Fill in resource table with node's IRQ info
473  * of_irq_init - Scan and init matching interrupt controllers in DT
490 		if (!of_property_read_bool(np, "interrupt-controller") ||  in of_irq_init()
494 		if (WARN(!match->data, "of_irq_init: no init function for %s\n",  in of_irq_init()
495 			 match->compatible))  in of_irq_init()
500 		 * pointer, interrupt-parent device_node etc.  in of_irq_init()
508 		desc->irq_init_cb = match->data;  in of_irq_init()
509 		desc->dev = of_node_get(np);  in of_irq_init()
510 		desc->interrupt_parent = of_irq_find_parent(np);  in of_irq_init()
511 		if (desc->interrupt_parent == np)  in of_irq_init()
512 			desc->interrupt_parent = NULL;  in of_irq_init()
513 		list_add_tail(&desc->list, &intc_desc_list);  in of_irq_init()
517 	 * The root irq controller is the one without an interrupt-parent.  in of_irq_init()
530 			if (desc->interrupt_parent != parent)  in of_irq_init()
533 			list_del(&desc->list);  in of_irq_init()
535 			of_node_set_flag(desc->dev, OF_POPULATED);  in of_irq_init()
538 				 desc->dev,  in of_irq_init()
539 				 desc->dev, desc->interrupt_parent);  in of_irq_init()
540 			ret = desc->irq_init_cb(desc->dev,  in of_irq_init()
541 						desc->interrupt_parent);  in of_irq_init()
543 				of_node_clear_flag(desc->dev, OF_POPULATED);  in of_irq_init()
552 			list_add_tail(&desc->list, &intc_parent_list);  in of_irq_init()
562 		list_del(&desc->list);  in of_irq_init()
563 		parent = desc->dev;  in of_irq_init()
568 		list_del(&desc->list);  in of_irq_init()
573 		list_del(&desc->list);  in of_irq_init()
574 		of_node_put(desc->dev);  in of_irq_init()
587 	 * "msi-map" property.  in __of_msi_map_id()
589 	for (parent_dev = dev; parent_dev; parent_dev = parent_dev->parent)  in __of_msi_map_id()
590 		if (!of_map_id(parent_dev->of_node, id_in, "msi-map",  in __of_msi_map_id()
591 				"msi-map-mask", np, &id_out))  in __of_msi_map_id()
597  * of_msi_map_id - Map a MSI ID for a device.
599  * @msi_np: device node of the expected msi controller.
600  * @id_in: unmapped MSI ID for the device.
602  * Walk up the device hierarchy looking for devices with a "msi-map"
605  * Returns the mapped MSI ID.
613  * of_msi_map_get_device_domain - Use msi-map to find the relevant MSI domain
618  * Walk up the device hierarchy looking for devices with a "msi-map"
621  * Returns: the MSI domain for this device (or NULL on failure)
633  * of_msi_get_domain - Use msi-parent to find the relevant MSI domain
638  * Parse the msi-parent property (both the simple and the complex
639  * versions), and returns the corresponding MSI domain.
641  * Returns: the MSI domain for this device (or NULL on failure).
650 	/* Check for a single msi-parent property */  in of_msi_get_domain()
651 	msi_np = of_parse_phandle(np, "msi-parent", 0);  in of_msi_get_domain()
652 	if (msi_np && !of_property_read_bool(msi_np, "#msi-cells")) {  in of_msi_get_domain()
660 		/* Check for the complex msi-parent version */  in of_msi_get_domain()
664 		while (!of_parse_phandle_with_args(np, "msi-parent",  in of_msi_get_domain()
665 						   "#msi-cells",  in of_msi_get_domain()
680  * of_msi_configure - Set the msi_domain field of a device
681  * @dev: device structure to associate with an MSI irq domain