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1 | /* |
2 | * Copyright (C) 2013-2015 ARM Limited, All Rights Reserved. | |
3 | * Author: Marc Zyngier <marc.zyngier@arm.com> | |
4 | * | |
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. | |
8 | * | |
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. | |
13 | * | |
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/>. | |
16 | */ | |
17 | ||
18 | #include <linux/device.h> | |
19 | #include <linux/msi.h> | |
20 | #include <linux/of.h> | |
21 | #include <linux/of_irq.h> | |
22 | ||
23 | static struct irq_chip its_pmsi_irq_chip = { | |
24 | .name = "ITS-pMSI", | |
25 | }; | |
26 | ||
27 | static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev, | |
28 | int nvec, msi_alloc_info_t *info) | |
29 | { | |
30 | struct msi_domain_info *msi_info; | |
31 | u32 dev_id; | |
32 | int ret; | |
33 | ||
34 | msi_info = msi_get_domain_info(domain->parent); | |
35 | ||
36 | /* Suck the DeviceID out of the msi-parent property */ | |
37 | ret = of_property_read_u32_index(dev->of_node, "msi-parent", | |
38 | 1, &dev_id); | |
39 | if (ret) | |
40 | return ret; | |
41 | ||
42 | /* ITS specific DeviceID, as the core ITS ignores dev. */ | |
43 | info->scratchpad[0].ul = dev_id; | |
44 | ||
45 | return msi_info->ops->msi_prepare(domain->parent, | |
46 | dev, nvec, info); | |
47 | } | |
48 | ||
49 | static struct msi_domain_ops its_pmsi_ops = { | |
50 | .msi_prepare = its_pmsi_prepare, | |
51 | }; | |
52 | ||
53 | static struct msi_domain_info its_pmsi_domain_info = { | |
54 | .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS), | |
55 | .ops = &its_pmsi_ops, | |
56 | .chip = &its_pmsi_irq_chip, | |
57 | }; | |
58 | ||
59 | static struct of_device_id its_device_id[] = { | |
60 | { .compatible = "arm,gic-v3-its", }, | |
61 | {}, | |
62 | }; | |
63 | ||
64 | static int __init its_pmsi_init(void) | |
65 | { | |
66 | struct device_node *np; | |
67 | struct irq_domain *parent; | |
68 | ||
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")) | |
72 | continue; | |
73 | ||
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", | |
77 | np->full_name); | |
78 | continue; | |
79 | } | |
80 | ||
81 | if (!platform_msi_create_irq_domain(np, &its_pmsi_domain_info, | |
82 | parent)) { | |
83 | pr_err("%s: unable to create platform domain\n", | |
84 | np->full_name); | |
85 | continue; | |
86 | } | |
87 | ||
88 | pr_info("Platform MSI: %s domain created\n", np->full_name); | |
89 | } | |
90 | ||
91 | return 0; | |
92 | } | |
93 | early_initcall(its_pmsi_init); |