linux-imx

/*

 * Copyright (c) 2017, Linaro Ltd.  All rights reserved.

 *

 * Author: Daniel Lezcano <daniel.lezcano@linaro.org>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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/clk.h>

#include <linux/interrupt.h>

#include <linux/of.h>

#include <linux/of_address.h>

#include <linux/of_irq.h>

#include <linux/slab.h>

​

#include "timer-of.h"

​

/**

 * timer_of_irq_exit - Release the interrupt

 * @of_irq: an of_timer_irq structure pointer

 *

 * Free the irq resource

 */

static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)

{

    struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);

​

    struct clock_event_device *clkevt = &to->clkevt;

​

    of_irq->percpu ? free_percpu_irq(of_irq->irq, clkevt) :

        free_irq(of_irq->irq, clkevt);

}

​

/**

 * timer_of_irq_init - Request the interrupt

 * @np: a device tree node pointer

 * @of_irq: an of_timer_irq structure pointer

 *

 * Get the interrupt number from the DT from its definition and

 * request it. The interrupt is gotten by falling back the following way:

 *

 * - Get interrupt number by name

 * - Get interrupt number by index

 *

 * When the interrupt is per CPU, 'request_percpu_irq()' is called,

 * otherwise 'request_irq()' is used.

 *

 * Returns 0 on success, < 0 otherwise

 */

static __init int timer_of_irq_init(struct device_node *np,

                    struct of_timer_irq *of_irq)

{

    int ret;

    struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);