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/device.h>
20 #include <linux/msi.h>
22 #include <linux/of_irq.h>
24 static struct irq_chip its_pmsi_irq_chip = {
28 static int of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev,
33 /* Suck the DeviceID out of the msi-parent property */
35 struct of_phandle_args args;
37 ret = of_parse_phandle_with_args(dev->of_node,
38 "msi-parent", "#msi-cells",
40 if (args.np == irq_domain_get_of_node(domain)) {
41 if (WARN_ON(args.args_count != 1))
43 *dev_id = args.args[0];
51 int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
56 static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
57 int nvec, msi_alloc_info_t *info)
59 struct msi_domain_info *msi_info;
63 msi_info = msi_get_domain_info(domain->parent);
66 ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
68 ret = iort_pmsi_get_dev_id(dev, &dev_id);
72 /* ITS specific DeviceID, as the core ITS ignores dev. */
73 info->scratchpad[0].ul = dev_id;
75 return msi_info->ops->msi_prepare(domain->parent,
79 static struct msi_domain_ops its_pmsi_ops = {
80 .msi_prepare = its_pmsi_prepare,
83 static struct msi_domain_info its_pmsi_domain_info = {
84 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
86 .chip = &its_pmsi_irq_chip,
89 static struct of_device_id its_device_id[] = {
90 { .compatible = "arm,gic-v3-its", },
94 static int __init its_pmsi_init_one(struct fwnode_handle *fwnode,
97 struct irq_domain *parent;
99 parent = irq_find_matching_fwnode(fwnode, DOMAIN_BUS_NEXUS);
100 if (!parent || !msi_get_domain_info(parent)) {
101 pr_err("%s: unable to locate ITS domain\n", name);
105 if (!platform_msi_create_irq_domain(fwnode, &its_pmsi_domain_info,
107 pr_err("%s: unable to create platform domain\n", name);
111 pr_info("Platform MSI: %s domain created\n", name);
117 its_pmsi_parse_madt(struct acpi_subtable_header *header,
118 const unsigned long end)
120 struct acpi_madt_generic_translator *its_entry;
121 struct fwnode_handle *domain_handle;
122 const char *node_name;
125 its_entry = (struct acpi_madt_generic_translator *)header;
126 node_name = kasprintf(GFP_KERNEL, "ITS@0x%lx",
127 (long)its_entry->base_address);
128 domain_handle = iort_find_domain_token(its_entry->translation_id);
129 if (!domain_handle) {
130 pr_err("%s: Unable to locate ITS domain handle\n", node_name);
134 err = its_pmsi_init_one(domain_handle, node_name);
141 static void __init its_pmsi_acpi_init(void)
143 acpi_table_parse_madt(ACPI_MADT_TYPE_GENERIC_TRANSLATOR,
144 its_pmsi_parse_madt, 0);
147 static inline void its_pmsi_acpi_init(void) { }
150 static void __init its_pmsi_of_init(void)
152 struct device_node *np;
154 for (np = of_find_matching_node(NULL, its_device_id); np;
155 np = of_find_matching_node(np, its_device_id)) {
156 if (!of_property_read_bool(np, "msi-controller"))
159 its_pmsi_init_one(of_node_to_fwnode(np), np->full_name);
163 static int __init its_pmsi_init(void)
166 its_pmsi_acpi_init();
169 early_initcall(its_pmsi_init);