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|
/*
** 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
**
** 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 MAJOR_NR Z2RAM_MAJOR
#include <linux/major.h>
#include <linux/malloc.h>
#include <linux/blk.h>
#include <linux/init.h>
#if defined(MODULE)
#include <linux/module.h>
#endif
#include <asm/setup.h>
#include <asm/bitops.h>
#include <asm/amigahw.h>
#include <linux/zorro.h>
#define TRUE (1)
#define FALSE (0)
#define Z2MINOR_COMBINED (0)
#define Z2MINOR_Z2ONLY (1)
#define Z2MINOR_CHIPONLY (2)
#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
static u_long *z2ram_map = NULL;
static u_long z2ram_size = 0;
static int z2_blocksizes[3] = { 1024, 1024, 1024 };
static int z2_sizes[3] = { 0, 0, 0 };
static int z2_count = 0;
static int chip_count = 0;
static int current_device = -1;
static void
do_z2_request( void )
{
u_long start, len, addr, size;
while ( TRUE )
{
INIT_REQUEST;
start = CURRENT->sector << 9;
len = CURRENT->current_nr_sectors << 9;
if ( ( start + len ) > z2ram_size )
{
printk( KERN_ERR DEVICE_NAME ": bad access: block=%ld, count=%ld\n",
CURRENT->sector,
CURRENT->current_nr_sectors);
end_request( FALSE );
continue;
}
if ( ( CURRENT->cmd != READ ) && ( CURRENT->cmd != WRITE ) )
{
printk( KERN_ERR DEVICE_NAME ": bad command: %d\n", CURRENT->cmd );
end_request( FALSE );
continue;
}
while ( len )
{
addr = start & Z2RAM_CHUNKMASK;
size = Z2RAM_CHUNKSIZE - addr;
if ( len < size )
size = len;
addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
if ( CURRENT->cmd == READ )
memcpy( CURRENT->buffer, (char *)addr, size );
else
memcpy( (char *)addr, CURRENT->buffer, size );
start += size;
len -= size;
}
end_request( TRUE );
}
}
static void
get_z2ram( void )
{
int i;
for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
{
if ( test_bit( i, zorro_unused_z2ram ) )
{
z2_count++;
z2ram_map[ z2ram_size++ ] =
ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT );
clear_bit( i, zorro_unused_z2ram );
}
}
return;
}
static void
get_chipram( void )
{
while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
{
chip_count++;
z2ram_map[ z2ram_size ] =
(u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE );
if ( z2ram_map[ z2ram_size ] == 0 )
{
break;
}
z2ram_size++;
}
return;
}
static int
z2_open( struct inode *inode, struct file *filp )
{
int device;
int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
sizeof( z2ram_map[0] );
int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
sizeof( z2ram_map[0] );
device = DEVICE_NR( inode->i_rdev );
if ( current_device != -1 && current_device != device )
{
return -EBUSY;
}
if ( current_device == -1 )
{
z2_count = 0;
chip_count = 0;
z2ram_size = 0;
switch ( device )
{
case Z2MINOR_COMBINED:
z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
if ( z2ram_map == NULL )
{
printk( KERN_ERR DEVICE_NAME
": cannot get mem for z2ram_map\n" );
return -ENOMEM;
}
get_z2ram();
get_chipram();
if ( z2ram_size != 0 )
printk( KERN_INFO DEVICE_NAME
": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
z2_count * Z2RAM_CHUNK1024,
chip_count * Z2RAM_CHUNK1024,
( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
break;
case Z2MINOR_Z2ONLY:
z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
if ( z2ram_map == NULL )
{
printk( KERN_ERR DEVICE_NAME
": cannot get mem for z2ram_map\n" );
return -ENOMEM;
}
get_z2ram();
if ( z2ram_size != 0 )
printk( KERN_INFO DEVICE_NAME
": using %iK of Zorro II RAM\n",
z2_count * Z2RAM_CHUNK1024 );
break;
case Z2MINOR_CHIPONLY:
z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
if ( z2ram_map == NULL )
{
printk( KERN_ERR DEVICE_NAME
": cannot get mem for z2ram_map\n" );
return -ENOMEM;
}
get_chipram();
if ( z2ram_size != 0 )
printk( KERN_INFO DEVICE_NAME
": using %iK Chip RAM\n",
chip_count * Z2RAM_CHUNK1024 );
break;
default:
return -ENODEV;
}
if ( z2ram_size == 0 )
{
kfree( z2ram_map );
printk( KERN_NOTICE DEVICE_NAME
": no unused ZII/Chip RAM found\n" );
return -ENOMEM;
}
current_device = device;
z2ram_size <<= Z2RAM_CHUNKSHIFT;
z2_sizes[ device ] = z2ram_size >> 10;
blk_size[ MAJOR_NR ] = z2_sizes;
}
#if defined(MODULE)
MOD_INC_USE_COUNT;
#endif
return 0;
}
static void
z2_release( struct inode *inode, struct file *filp )
{
if ( current_device == -1 )
return;
sync_dev( inode->i_rdev );
#if defined(MODULE)
MOD_DEC_USE_COUNT;
#endif
return;
}
static struct file_operations z2_fops =
{
NULL, /* lseek - default */
block_read, /* read - general block-dev read */
block_write, /* write - general block-dev write */
NULL, /* readdir - bad */
NULL, /* poll */
NULL, /* ioctl */
NULL, /* mmap */
z2_open, /* open */
z2_release, /* release */
block_fsync /* fsync */
};
__initfunc(int
z2_init( void ))
{
if ( !MACH_IS_AMIGA )
return -ENXIO;
if ( register_blkdev( MAJOR_NR, DEVICE_NAME, &z2_fops ) )
{
printk( KERN_ERR DEVICE_NAME ": Unable to get major %d\n",
MAJOR_NR );
return -EBUSY;
}
blk_dev[ MAJOR_NR ].request_fn = DEVICE_REQUEST;
blksize_size[ MAJOR_NR ] = z2_blocksizes;
blk_size[ MAJOR_NR ] = z2_sizes;
return 0;
}
#if defined(MODULE)
int
init_module( void )
{
int error;
error = z2_init();
if ( error == 0 )
{
printk( KERN_INFO DEVICE_NAME ": loaded as module\n" );
}
return error;
}
void
cleanup_module( void )
{
int i, j;
if ( unregister_blkdev( MAJOR_NR, DEVICE_NAME ) != 0 )
printk( KERN_ERR DEVICE_NAME ": unregister of device failed\n");
if ( current_device != -1 )
{
i = 0;
for ( j = 0 ; j < z2_count; j++ )
{
set_bit( i++, zorro_unused_z2ram );
}
for ( j = 0 ; j < chip_count; j++ )
{
if ( z2ram_map[ i ] )
{
amiga_chip_free( (void *) z2ram_map[ i++ ] );
}
}
if ( z2ram_map != NULL )
{
kfree( z2ram_map );
}
}
return;
}
#endif
|
