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/acpi_iort.h>
19 #include <linux/msi.h>
21 #include <linux/of_irq.h>
22 #include <linux/of_pci.h>
24 static void its_mask_msi_irq(struct irq_data
*d
)
27 irq_chip_mask_parent(d
);
30 static void its_unmask_msi_irq(struct irq_data
*d
)
32 pci_msi_unmask_irq(d
);
33 irq_chip_unmask_parent(d
);
36 static struct irq_chip its_msi_irq_chip
= {
38 .irq_unmask
= its_unmask_msi_irq
,
39 .irq_mask
= its_mask_msi_irq
,
40 .irq_eoi
= irq_chip_eoi_parent
,
41 .irq_write_msi_msg
= pci_msi_domain_write_msg
,
44 static int its_pci_msi_vec_count(struct pci_dev
*pdev
, void *data
)
46 int msi
, msix
, *count
= data
;
48 msi
= max(pci_msi_vec_count(pdev
), 0);
49 msix
= max(pci_msix_vec_count(pdev
), 0);
50 *count
+= max(msi
, msix
);
55 static int its_get_pci_alias(struct pci_dev
*pdev
, u16 alias
, void *data
)
57 struct pci_dev
**alias_dev
= data
;
64 static int its_pci_msi_prepare(struct irq_domain
*domain
, struct device
*dev
,
65 int nvec
, msi_alloc_info_t
*info
)
67 struct pci_dev
*pdev
, *alias_dev
;
68 struct msi_domain_info
*msi_info
;
74 msi_info
= msi_get_domain_info(domain
->parent
);
76 pdev
= to_pci_dev(dev
);
78 * If pdev is downstream of any aliasing bridges, take an upper
79 * bound of how many other vectors could map to the same DevID.
81 pci_for_each_dma_alias(pdev
, its_get_pci_alias
, &alias_dev
);
82 if (alias_dev
!= pdev
&& alias_dev
->subordinate
)
83 pci_walk_bus(alias_dev
->subordinate
, its_pci_msi_vec_count
,
86 /* ITS specific DeviceID, as the core ITS ignores dev. */
87 info
->scratchpad
[0].ul
= pci_msi_domain_get_msi_rid(domain
, pdev
);
89 return msi_info
->ops
->msi_prepare(domain
->parent
,
90 dev
, max(nvec
, alias_count
), info
);
93 static struct msi_domain_ops its_pci_msi_ops
= {
94 .msi_prepare
= its_pci_msi_prepare
,
97 static 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
,
104 static struct of_device_id its_device_id
[] = {
105 { .compatible
= "arm,gic-v3-its", },
109 static int __init
its_pci_msi_init_one(struct fwnode_handle
*handle
,
112 struct irq_domain
*parent
;
114 parent
= irq_find_matching_fwnode(handle
, DOMAIN_BUS_NEXUS
);
115 if (!parent
|| !msi_get_domain_info(parent
)) {
116 pr_err("%s: Unable to locate ITS domain\n", name
);
120 if (!pci_msi_create_irq_domain(handle
, &its_pci_msi_domain_info
,
122 pr_err("%s: Unable to create PCI domain\n", name
);
129 static int __init
its_pci_of_msi_init(void)
131 struct device_node
*np
;
133 for (np
= of_find_matching_node(NULL
, its_device_id
); np
;
134 np
= of_find_matching_node(np
, its_device_id
)) {
135 if (!of_property_read_bool(np
, "msi-controller"))
138 if (its_pci_msi_init_one(of_node_to_fwnode(np
), np
->full_name
))
141 pr_info("PCI/MSI: %pOF domain created\n", np
);
150 its_pci_msi_parse_madt(struct acpi_subtable_header
*header
,
151 const unsigned long end
)
153 struct acpi_madt_generic_translator
*its_entry
;
154 struct fwnode_handle
*dom_handle
;
155 const char *node_name
;
158 its_entry
= (struct acpi_madt_generic_translator
*)header
;
159 node_name
= kasprintf(GFP_KERNEL
, "ITS@0x%lx",
160 (long)its_entry
->base_address
);
161 dom_handle
= iort_find_domain_token(its_entry
->translation_id
);
163 pr_err("%s: Unable to locate ITS domain handle\n", node_name
);
167 err
= its_pci_msi_init_one(dom_handle
, node_name
);
169 pr_info("PCI/MSI: %s domain created\n", node_name
);
176 static int __init
its_pci_acpi_msi_init(void)
178 acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR
,
179 its_pci_msi_parse_madt
, 0);
183 static int __init
its_pci_acpi_msi_init(void)
189 static int __init
its_pci_msi_init(void)
191 its_pci_of_msi_init();
192 its_pci_acpi_msi_init();
196 early_initcall(its_pci_msi_init
);