linux-imx

// SPDX-License-Identifier: GPL-2.0

/* Code to support devices on the DIO and DIO-II bus

 * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk>

 * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de>

 * 

 * This code has basically these routines at the moment:

 * int dio_find(u_int deviceid)

 *    Search the list of DIO devices and return the select code

 *    of the next unconfigured device found that matches the given device ID.

 *    Note that the deviceid parameter should be the encoded ID.

 *    This means that framebuffers should pass it as 

 *    DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)

 *    (or whatever); everybody else just uses DIO_ID_FOOBAR.

 * unsigned long dio_scodetophysaddr(int scode)

 *    Return the physical address corresponding to the given select code.

 * int dio_scodetoipl(int scode)

 *    Every DIO card has a fixed interrupt priority level. This function 

 *    returns it, whatever it is.

 * const char *dio_scodetoname(int scode)

 *    Return a character string describing this board [might be "" if 

 *    not CONFIG_DIO_CONSTANTS]

 * void dio_config_board(int scode)     mark board as configured in the list

 * void dio_unconfig_board(int scode)   mark board as no longer configured

 *

 * This file is based on the way the Amiga port handles Zorro II cards, 

 * although we aren't so complicated...

 */

#include <linux/module.h>

#include <linux/string.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <linux/dio.h>

#include <linux/slab.h>                         /* kmalloc() */

#include <linux/uaccess.h>

#include <asm/io.h>                             /* readb() */

​

struct dio_bus dio_bus = {

    .resources = {

        /* DIO range */

        { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },

        /* DIO-II range */

        { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }

    },

    .name = "DIO bus"

};

​

/* not a real config option yet! */

#define CONFIG_DIO_CONSTANTS

​

#ifdef CONFIG_DIO_CONSTANTS

/* We associate each numeric ID with an appropriate descriptive string

 * using a constant array of these structs.

 * FIXME: we should be able to arrange to throw away most of the strings

 * using the initdata stuff. Then we wouldn't need to worry about 

 * carrying them around...

 * I think we do this by copying them into newly kmalloc()ed memory and 

 * marking the names[] array as .initdata ?

 */

struct dioname

{

        int id;

        const char *name;