linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Fake VME bridge support.

 *

 * This drive provides a fake VME bridge chip, this enables debugging of the

 * VME framework in the absence of a VME system.

 *

 * This driver has to do a number of things in software that would be driven

 * by hardware if it was available, it will also result in extra overhead at

 * times when compared with driving actual hardware.

 *

 * Author: Martyn Welch <martyn@welches.me.uk>

 * Copyright (c) 2014 Martyn Welch

 *

 * Based on vme_tsi148.c:

 *

 * Author: Martyn Welch <martyn.welch@ge.com>

 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.

 *

 * Based on work by Tom Armistead and Ajit Prem

 * Copyright 2004 Motorola Inc.

 */

​

#include <linux/device.h>

#include <linux/errno.h>

#include <linux/interrupt.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/slab.h>

#include <linux/spinlock.h>

#include <linux/types.h>

#include <linux/vme.h>

​

#include "../vme_bridge.h"

​

/*

 *  Define the number of each that the fake driver supports.

 */

#define FAKE_MAX_MASTER     8   /* Max Master Windows */

#define FAKE_MAX_SLAVE      8   /* Max Slave Windows */

​

/* Structures to hold information normally held in device registers */

struct fake_slave_window {

    int enabled;

    unsigned long long vme_base;

    unsigned long long size;

    void *buf_base;

    u32 aspace;

    u32 cycle;

};

​

struct fake_master_window {

    int enabled;

    unsigned long long vme_base;

    unsigned long long size;

    u32 aspace;

    u32 cycle;

    u32 dwidth;

};

​

/* Structure used to hold driver specific information */

struct fake_driver {

    struct vme_bridge *parent;