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/msi.h>
20 #include <linux/of_irq.h>
21 #include <linux/of_pci.h>
23 static void its_mask_msi_irq(struct irq_data
*d
)
26 irq_chip_mask_parent(d
);
29 static void its_unmask_msi_irq(struct irq_data
*d
)
31 pci_msi_unmask_irq(d
);
32 irq_chip_unmask_parent(d
);
35 static struct irq_chip its_msi_irq_chip
= {
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
,
43 struct its_pci_alias
{
49 static int its_pci_msi_vec_count(struct pci_dev
*pdev
)
53 msi
= max(pci_msi_vec_count(pdev
), 0);
54 msix
= max(pci_msix_vec_count(pdev
), 0);
56 return max(msi
, msix
);
59 static int its_get_pci_alias(struct pci_dev
*pdev
, u16 alias
, void *data
)
61 struct its_pci_alias
*dev_alias
= data
;
63 dev_alias
->dev_id
= alias
;
64 if (pdev
!= dev_alias
->pdev
)
65 dev_alias
->count
+= its_pci_msi_vec_count(pdev
);
70 static int its_pci_msi_prepare(struct irq_domain
*domain
, struct device
*dev
,
71 int nvec
, msi_alloc_info_t
*info
)
74 struct its_pci_alias dev_alias
;
75 struct msi_domain_info
*msi_info
;
80 msi_info
= msi_get_domain_info(domain
->parent
);
82 pdev
= to_pci_dev(dev
);
83 dev_alias
.pdev
= pdev
;
84 dev_alias
.count
= nvec
;
86 pci_for_each_dma_alias(pdev
, its_get_pci_alias
, &dev_alias
);
88 /* ITS specific DeviceID, as the core ITS ignores dev. */
89 info
->scratchpad
[0].ul
= dev_alias
.dev_id
;
91 return msi_info
->ops
->msi_prepare(domain
->parent
,
92 dev
, dev_alias
.count
, info
);
95 static struct msi_domain_ops its_pci_msi_ops
= {
96 .msi_prepare
= its_pci_msi_prepare
,
99 static 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
,
106 static struct of_device_id its_device_id
[] = {
107 { .compatible
= "arm,gic-v3-its", },
111 static int __init
its_pci_msi_init(void)
113 struct device_node
*np
;
114 struct irq_domain
*parent
;
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"))
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",
128 if (!pci_msi_create_irq_domain(np
, &its_pci_msi_domain_info
,
130 pr_err("%s: unable to create PCI domain\n",
135 pr_info("PCI/MSI: %s domain created\n", np
->full_name
);
140 early_initcall(its_pci_msi_init
);