linux-imx

/*

 * 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/acpi_iort.h>

#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 of_pmsi_get_dev_id(struct irq_domain *domain, struct device *dev,

                  u32 *dev_id)

{

    int ret, index = 0;

​

    /* 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;

        }

        index++;

    } while (!ret);

​

    return ret;

}

​

int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)

{

    return -1;

}

​

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;

​