/*
* Copyright (C) 2013-2015 ARM Limited, All Rights Reserved.
* Author: Marc Zyngier <marc.zyngier@arm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/device.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_irq.h>
static struct irq_chip its_pmsi_irq_chip = {
.name = "ITS-pMSI",
};
static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,
int nvec, msi_alloc_info_t *info)
{
struct msi_domain_info *msi_info;
u32 dev_id;
int ret, index = 0;
msi_info = msi_get_domain_info(domain->parent);
/* Suck the DeviceID out of the msi-parent property */
do {
struct of_phandle_args args;
ret = of_parse_phandle_with_args(dev->of_node,
"msi-parent", "#msi-cells",
index, &args);
if (args.np == irq_domain_get_of_node(domain)) {
if (WARN_ON(args.args_count != 1))
return -EINVAL;
dev_id = args.args[0];
break;
}
} while (!ret);
if (ret)
return ret;
/* ITS specific DeviceID, as the core ITS ignores dev. */
info->scratchpad[0].ul = dev_id;
return msi_info->ops->msi_prepare(domain->parent,
dev, nvec, info);
}
static struct msi_domain_ops its_pmsi_ops = {
.msi_prepare = its_pmsi_prepare,
};
static struct msi_domain_info its_pmsi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
.ops = &its_pmsi_ops,
.chip = &its_pmsi_irq_chip,
};
static struct of_device_id its_device_id[] = {
{ .compatible = "arm,gic-v3-its", },
{},
};
static int __init its_pmsi_init(void)
{
struct device_node *np;
struct irq_domain *parent;
for (np = of_find_matching_node(NULL, its_device_id); np;
np = of_find_matching_node(np, its_device_id)) {
if (!of_property_read_bool(np, "msi-controller"))
continue;
parent = irq_find_matching_host(np, DOMAIN_BUS_NEXUS);
if (!parent || !msi_get_domain_info(parent)) {
pr_err("%s: unable to locate ITS domain\n",
np->full_name);
continue;
}
if (!platform_msi_create_irq_domain(of_node_to_fwnode(np),
&its_pmsi_domain_info,
parent)) {
pr_err("%s: unable to create platform domain\n",
np->full_name);
continue;
}
pr_info("Platform MSI: %s domain created\n", np->full_name);
}
return 0;
}
early_initcall(its_pmsi_init);
