Subversion Repositories funbase_ip_library

/*

 * Copyright (c) 2010, Mentor Graphics Corporation

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of the <ORGANIZATION> nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * Alternatively, this software may be distributed under the terms of the

 * GNU General Public License ("GPL") version 2 as published by the Free

 * Software Foundation.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/err.h>

#include <linux/ioport.h>

#include "mcomm.h"

#include "mcomm_dev.h"

static struct platform_device *mcomm_pdev;

static unsigned long mcomm_base;

module_param_named(base, mcomm_base, ulong, 0);

MODULE_PARM_DESC(base, "Physical address of the shared memory area");

static unsigned long mcomm_size;

module_param_named(size, mcomm_size, ulong, 0);

MODULE_PARM_DESC(size, "Size of the shared memory area");

static long mcomm_irq = NO_IRQ;

module_param_named(irq, mcomm_irq, long, 0);

MODULE_PARM_DESC(irq, "IRQ number used for interprocessor interrupts");

/* Allow user to manually specify the location of a shared memory region.

 * Of course, they must also have restricted the kernel's memory usage,

 * e.g. with the "mem=" kernel parameter. */

int mcomm_pdev_add(void)

{

        struct resource res[2];

        int rc = 0;

        if (!mcomm_size) {

                printk(KERN_ERR "%s: please provide base, size, and irq\n", __func__);

                return -EINVAL;

        }

        memset(res, 0, sizeof(res));

        res[0].start = mcomm_base;

        res[0].end = mcomm_base + mcomm_size - 1;

        res[0].flags = IORESOURCE_MEM,

        res[1].start = mcomm_irq;

        res[1].end = mcomm_irq;

        res[1].flags = IORESOURCE_IRQ,

        mcomm_pdev = platform_device_register_simple("mcomm", 0, res, 2);

        if (IS_ERR(mcomm_pdev)) {

                printk(KERN_WARNING "%s: Failed to create specified shared memory "

                        "device.\n", __func__);

                return PTR_ERR(mcomm_pdev);

        }

        return rc;

}

EXPORT_SYMBOL(mcomm_pdev_add);

void mcomm_pdev_release(void)

{

        platform_device_unregister(mcomm_pdev);

}

EXPORT_SYMBOL(mcomm_pdev_release);

MODULE_LICENSE("GPL v2");

MODULE_AUTHOR("Hollis Blanchard <hollis_blanchard@mentor.com>");

MODULE_DESCRIPTION("Manually specify shared memory area");