blob: cf351c6374645e7b0e4fe982a937d49b4904cfe9 [file] [log] [blame]
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;
45 u32 dev_id;
46 u32 count;
47};
48
49static int its_pci_msi_vec_count(struct pci_dev *pdev)
50{
51 int msi, msix;
52
53 msi = max(pci_msi_vec_count(pdev), 0);
54 msix = max(pci_msix_vec_count(pdev), 0);
55
56 return max(msi, msix);
57}
58
59static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
60{
61 struct its_pci_alias *dev_alias = data;
62
63 dev_alias->dev_id = alias;
64 if (pdev != dev_alias->pdev)
65 dev_alias->count += its_pci_msi_vec_count(dev_alias->pdev);
66
67 return 0;
68}
69
70static int its_pci_msi_prepare(struct irq_domain *domain, struct device *dev,
71 int nvec, msi_alloc_info_t *info)
72{
73 struct pci_dev *pdev;
74 struct its_pci_alias dev_alias;
Marc Zyngier54456db2015-07-28 14:46:21 +010075 struct msi_domain_info *msi_info;
Marc Zyngierf1304202015-07-28 14:46:18 +010076
77 if (!dev_is_pci(dev))
78 return -EINVAL;
79
Marc Zyngier54456db2015-07-28 14:46:21 +010080 msi_info = msi_get_domain_info(domain->parent);
81
Marc Zyngierf1304202015-07-28 14:46:18 +010082 pdev = to_pci_dev(dev);
83 dev_alias.pdev = pdev;
84 dev_alias.count = nvec;
85
86 pci_for_each_dma_alias(pdev, its_get_pci_alias, &dev_alias);
87
Marc Zyngier54456db2015-07-28 14:46:21 +010088 /* ITS specific DeviceID, as the core ITS ignores dev. */
89 info->scratchpad[0].ul = dev_alias.dev_id;
90
91 return msi_info->ops->msi_prepare(domain->parent,
92 dev, dev_alias.count, info);
Marc Zyngierf1304202015-07-28 14:46:18 +010093}
94
95static struct msi_domain_ops its_pci_msi_ops = {
96 .msi_prepare = its_pci_msi_prepare,
97};
98
99static struct msi_domain_info its_pci_msi_domain_info = {
100 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
101 MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
102 .ops = &its_pci_msi_ops,
103 .chip = &its_msi_irq_chip,
104};
105
Marc Zyngier54456db2015-07-28 14:46:21 +0100106static struct of_device_id its_device_id[] = {
107 { .compatible = "arm,gic-v3-its", },
108 {},
109};
110
111static int __init its_pci_msi_init(void)
Marc Zyngierf1304202015-07-28 14:46:18 +0100112{
Marc Zyngier54456db2015-07-28 14:46:21 +0100113 struct device_node *np;
114 struct irq_domain *parent;
115
116 for (np = of_find_matching_node(NULL, its_device_id); np;
117 np = of_find_matching_node(np, its_device_id)) {
118 if (!of_property_read_bool(np, "msi-controller"))
119 continue;
120
121 parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
122 if (!parent || !msi_get_domain_info(parent)) {
123 pr_err("%s: unable to locate ITS domain\n",
124 np->full_name);
125 continue;
126 }
127
128 if (!pci_msi_create_irq_domain(np, &its_pci_msi_domain_info,
129 parent)) {
130 pr_err("%s: unable to create PCI domain\n",
131 np->full_name);
132 continue;
133 }
134
135 pr_info("PCI/MSI: %s domain created\n", np->full_name);
136 }
137
138 return 0;
Marc Zyngierf1304202015-07-28 14:46:18 +0100139}
Marc Zyngier54456db2015-07-28 14:46:21 +0100140early_initcall(its_pci_msi_init);