2 * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
3 * Author: Marc Zyngier <marc.zyngier@arm.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include <linux/device.h>
19 #include <linux/msi.h>
21 #include <linux/of_irq.h>
23 static struct irq_chip its_pmsi_irq_chip = {
27 static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
28 int nvec, msi_alloc_info_t *info)
30 struct msi_domain_info *msi_info;
34 msi_info = msi_get_domain_info(domain->parent);
36 /* Suck the DeviceID out of the msi-parent property */
37 ret = of_property_read_u32_index(dev->of_node, "msi-parent",
42 /* ITS specific DeviceID, as the core ITS ignores dev. */
43 info->scratchpad[0].ul = dev_id;
45 return msi_info->ops->msi_prepare(domain->parent,
49 static struct msi_domain_ops its_pmsi_ops = {
50 .msi_prepare = its_pmsi_prepare,
53 static struct msi_domain_info its_pmsi_domain_info = {
54 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
56 .chip = &its_pmsi_irq_chip,
59 static struct of_device_id its_device_id[] = {
60 { .compatible = "arm,gic-v3-its", },
64 static int __init its_pmsi_init(void)
66 struct device_node *np;
67 struct irq_domain *parent;
69 for (np = of_find_matching_node(NULL, its_device_id); np;
70 np = of_find_matching_node(np, its_device_id)) {
71 if (!of_property_read_bool(np, "msi-controller"))
74 parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
75 if (!parent || !msi_get_domain_info(parent)) {
76 pr_err("%s: unable to locate ITS domain\n",
81 if (!platform_msi_create_irq_domain(np, &its_pmsi_domain_info,
83 pr_err("%s: unable to create platform domain\n",
88 pr_info("Platform MSI: %s domain created\n", np->full_name);
93 early_initcall(its_pmsi_init);