linux-imx

/*

 * Copyright (C) 2013-2015 Fujitsu Semiconductor Ltd.

 * Copyright (C) 2015 Linaro Ltd.

 * Author: Jassi Brar <jaswinder.singh@linaro.org>

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * 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.

 */

​

#include <linux/interrupt.h>

#include <linux/spinlock.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/slab.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/amba/bus.h>

#include <linux/mailbox_controller.h>

​

#define INTR_STAT_OFS   0x0

#define INTR_SET_OFS    0x8

#define INTR_CLR_OFS    0x10

​

#define MHU_LP_OFFSET   0x0

#define MHU_HP_OFFSET   0x20

#define MHU_SEC_OFFSET  0x200

#define TX_REG_OFFSET   0x100

​

#define MHU_CHANS   3

​

struct mhu_link {

    unsigned irq;

    void __iomem *tx_reg;

    void __iomem *rx_reg;

};

​

struct arm_mhu {

    void __iomem *base;

    struct mhu_link mlink[MHU_CHANS];

    struct mbox_chan chan[MHU_CHANS];

    struct mbox_controller mbox;

};

​

static irqreturn_t mhu_rx_interrupt(int irq, void *p)

{

    struct mbox_chan *chan = p;

    struct mhu_link *mlink = chan->con_priv;

    u32 val;

​

    val = readl_relaxed(mlink->rx_reg + INTR_STAT_OFS);

    if (!val)

        return IRQ_NONE;

​

    mbox_chan_received_data(chan, (void *)&val);

​

    writel_relaxed(val, mlink->rx_reg + INTR_CLR_OFS);