linux-imx

/*

 * Copyright Altera Corporation (C) 2013-2014. All rights reserved

 *

 * 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/device.h>

#include <linux/interrupt.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/mailbox_controller.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

​

#define DRIVER_NAME "altera-mailbox"

​

#define MAILBOX_CMD_REG         0x00

#define MAILBOX_PTR_REG         0x04

#define MAILBOX_STS_REG         0x08

#define MAILBOX_INTMASK_REG     0x0C

​

#define INT_PENDING_MSK         0x1

#define INT_SPACE_MSK           0x2

​

#define STS_PENDING_MSK         0x1

#define STS_FULL_MSK            0x2

#define STS_FULL_OFT            0x1

​

#define MBOX_PENDING(status)    (((status) & STS_PENDING_MSK))

#define MBOX_FULL(status)   (((status) & STS_FULL_MSK) >> STS_FULL_OFT)

​

enum altera_mbox_msg {

    MBOX_CMD = 0,

    MBOX_PTR,

};

​

#define MBOX_POLLING_MS     5   /* polling interval 5ms */

​

struct altera_mbox {

    bool is_sender;     /* 1-sender, 0-receiver */

    bool intr_mode;

    int irq;

    void __iomem *mbox_base;

    struct device *dev;

    struct mbox_controller controller;

​

    /* If the controller supports only RX polling mode */

    struct timer_list rxpoll_timer;

    struct mbox_chan *chan;

};

​

static struct altera_mbox *mbox_chan_to_altera_mbox(struct mbox_chan *chan)

{

    if (!chan || !chan->con_priv)

        return NULL;

​

    return (struct altera_mbox *)chan->con_priv;

}

​

static inline int altera_mbox_full(struct altera_mbox *mbox)

{

    u32 status;

​

    status = readl_relaxed(mbox->mbox_base + MAILBOX_STS_REG);

    return MBOX_FULL(status);

}

​

static inline int altera_mbox_pending(struct altera_mbox *mbox)

{

    u32 status;

​

    status = readl_relaxed(mbox->mbox_base + MAILBOX_STS_REG);

    return MBOX_PENDING(status);

}

​

static void altera_mbox_rx_intmask(struct altera_mbox *mbox, bool enable)

{

    u32 mask;

​

    mask = readl_relaxed(mbox->mbox_base + MAILBOX_INTMASK_REG);

    if (enable)