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
);