linux-imx

/*

** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space

**         as a block device, to be used as a RAM disk or swap space

** 

** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)

**

** ++Geert: support for zorro_unused_z2ram, better range checking

** ++roman: translate accesses via an array

** ++Milan: support for ChipRAM usage

** ++yambo: converted to 2.0 kernel

** ++yambo: modularized and support added for 3 minor devices including:

**          MAJOR  MINOR  DESCRIPTION

**          -----  -----  ----------------------------------------------

**          37     0       Use Zorro II and Chip ram

**          37     1       Use only Zorro II ram

**          37     2       Use only Chip ram

**          37     4-7     Use memory list entry 1-4 (first is 0)

** ++jskov: support for 1-4th memory list entry.

**

** Permission to use, copy, modify, and distribute this software and its

** documentation for any purpose and without fee is hereby granted, provided

** that the above copyright notice appear in all copies and that both that

** copyright notice and this permission notice appear in supporting

** documentation.  This software is provided "as is" without express or

** implied warranty.

*/

​

#define DEVICE_NAME "Z2RAM"

​

#include <linux/major.h>

#include <linux/vmalloc.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/blk-mq.h>

#include <linux/bitops.h>

#include <linux/mutex.h>

#include <linux/slab.h>

​

#include <asm/setup.h>

#include <asm/amigahw.h>

#include <asm/pgtable.h>

​

#include <linux/zorro.h>

​

​

#define Z2MINOR_COMBINED      (0)

#define Z2MINOR_Z2ONLY        (1)

#define Z2MINOR_CHIPONLY      (2)

#define Z2MINOR_MEMLIST1      (4)

#define Z2MINOR_MEMLIST2      (5)

#define Z2MINOR_MEMLIST3      (6)

#define Z2MINOR_MEMLIST4      (7)

#define Z2MINOR_COUNT         (8) /* Move this down when adding a new minor */

​

#define Z2RAM_CHUNK1024       ( Z2RAM_CHUNKSIZE >> 10 )

​

static DEFINE_MUTEX(z2ram_mutex);

static u_long *z2ram_map    = NULL;

static u_long z2ram_size    = 0;

static int z2_count         = 0;

static int chip_count       = 0;

static int list_count       = 0;

static int current_device   = -1;