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Marc Zyngierf1304202015-07-28 14:46:18 +01001/*
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/msi.h>
19#include <linux/of.h>
20#include <linux/of_irq.h>
21#include <linux/of_pci.h>
22
Marc Zyngierf1304202015-07-28 14:46:18 +010023static void its_mask_msi_irq(struct irq_data *d)
24{
25 pci_msi_mask_irq(d);
26 irq_chip_mask_parent(d);
27}
28
29static void its_unmask_msi_irq(struct irq_data *d)
30{
31 pci_msi_unmask_irq(d);
32 irq_chip_unmask_parent(d);
33}
34
35static struct irq_chip its_msi_irq_chip = {
36 .name = "ITS-MSI",
37 .irq_unmask = its_unmask_msi_irq,
38 .irq_mask = its_mask_msi_irq,
39 .irq_eoi = irq_chip_eoi_parent,
40 .irq_write_msi_msg = pci_msi_domain_write_msg,
41};
42
43struct its_pci_alias {
44 struct pci_dev *pdev;
Marc Zyngierf1304202015-07-28 14:46:18 +010045 u32 count;
46};
47
48static int its_pci_msi_vec_count(struct pci_dev *pdev)
49{
50 int msi, msix;
51
52 msi = max(pci_msi_vec_count(pdev), 0);
53 msix = max(pci_msix_vec_count(pdev), 0);
54
55 return max(msi, msix);
56}
57
58static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
59{
60 struct its_pci_alias *dev_alias = data;
61
Marc Zyngierf1304202015-07-28 14:46:18 +010062 if (pdev != dev_alias->pdev)
Marc Zyngier791c76d2015-10-02 16:44:06 +010063 dev_alias->count += its_pci_msi_vec_count(pdev);
Marc Zyngierf1304202015-07-28 14:46:18 +010064
65 return 0;
66}
67
68static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
69 int nvec, msi_alloc_info_t *info)
70{
71 struct pci_dev *pdev;
72 struct its_pci_alias dev_alias;
Marc Zyngier54456db2015-07-28 14:46:21 +010073 struct msi_domain_info *msi_info;
Marc Zyngierf1304202015-07-28 14:46:18 +010074
75 if (!dev_is_pci(dev))
76 return -EINVAL;
77
Marc Zyngier54456db2015-07-28 14:46:21 +010078 msi_info = msi_get_domain_info(domain->parent);
79
Marc Zyngierf1304202015-07-28 14:46:18 +010080 pdev = to_pci_dev(dev);
81 dev_alias.pdev = pdev;
82 dev_alias.count = nvec;
83
84 pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias);
85
Marc Zyngier54456db2015-07-28 14:46:21 +010086 /* ITS specific DeviceID, as the core ITS ignores dev. */
David Daneyccf91e62015-10-08 15:10:50 -070087 info->scratchpad[0].ul = pci_msi_domain_get_msi_rid(domain, pdev);
Marc Zyngier54456db2015-07-28 14:46:21 +010088
89 return msi_info->ops->msi_prepare(domain->parent,
90 dev, dev_alias.count, info);
Marc Zyngierf1304202015-07-28 14:46:18 +010091}
92
93static struct msi_domain_ops its_pci_msi_ops = {
94 .msi_prepare = its_pci_msi_prepare,
95};
96
97static struct msi_domain_info its_pci_msi_domain_info = {
98 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
99 MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
100 .ops = &its_pci_msi_ops,
101 .chip = &its_msi_irq_chip,
102};
103
Marc Zyngier54456db2015-07-28 14:46:21 +0100104static struct of_device_id its_device_id[] = {
105 { .compatible = "arm,gic-v3-its", },
106 {},
107};
108
109static int __init its_pci_msi_init(void)
Marc Zyngierf1304202015-07-28 14:46:18 +0100110{
Marc Zyngier54456db2015-07-28 14:46:21 +0100111 struct device_node *np;
112 struct irq_domain *parent;
113
114 for (np = of_find_matching_node(NULL, its_device_id); np;
115 np = of_find_matching_node(np, its_device_id)) {
116 if (!of_property_read_bool(np, "msi-controller"))
117 continue;
118
119 parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
120 if (!parent || !msi_get_domain_info(parent)) {
121 pr_err("%s: unable to locate ITS domain\n",
122 np->full_name);
123 continue;
124 }
125
Marc Zyngierbe5436c2015-10-13 12:51:44 +0100126 if (!pci_msi_create_irq_domain(of_node_to_fwnode(np),
127 &its_pci_msi_domain_info,
Marc Zyngier54456db2015-07-28 14:46:21 +0100128 parent)) {
129 pr_err("%s: unable to create PCI domain\n",
130 np->full_name);
131 continue;
132 }
133
134 pr_info("PCI/MSI: %s domain created\n", np->full_name);
135 }
136
137 return 0;
Marc Zyngierf1304202015-07-28 14:46:18 +0100138}
Marc Zyngier54456db2015-07-28 14:46:21 +0100139early_initcall(its_pci_msi_init);