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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
** 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 MAJOR_NR Z2RAM_MAJOR
#include <linux/major.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/blk.h>
#include <linux/init.h>
#include <linux/module.h>
#include <asm/setup.h>
#include <asm/bitops.h>
#include <asm/amigahw.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <linux/zorro.h>
extern int m68k_realnum_memory;
extern struct mem_info m68k_memory[NUM_MEMINFO];
#define TRUE (1)
#define FALSE (0)
#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 u_long *z2ram_map = NULL;
static u_long z2ram_size = 0;
static int z2_blocksizes[Z2MINOR_COUNT];
static int z2_sizes[Z2MINOR_COUNT];
static int z2_count = 0;
static int chip_count = 0;
static int list_count = 0;
static int current_device = -1;
static void
do_z2_request( request_queue_t * q )
{
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, "z2ram" );
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] );
int rc = -ENOMEM;
device = DEVICE_NR( inode->i_rdev );
if ( current_device != -1 && current_device != device )
{
rc = -EBUSY;
goto err_out;
}
if ( current_device == -1 )
{
z2_count = 0;
chip_count = 0;
list_count = 0;
z2ram_size = 0;
/* Use a specific list entry. */
if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
int index = device - Z2MINOR_MEMLIST1 + 1;
unsigned long size, paddr, vaddr;
if (index >= m68k_realnum_memory) {
printk( KERN_ERR DEVICE_NAME
": no such entry in z2ram_map\n" );
goto err_out;
}
paddr = m68k_memory[index].addr;
size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
#ifdef __powerpc__
/* FIXME: ioremap doesn't build correct memory tables. */
{
vfree(vmalloc (size));
}
vaddr = (unsigned long) __ioremap (paddr, size,
_PAGE_WRITETHRU);
#else
vaddr = (unsigned long)ioremap(paddr, size);
#endif
z2ram_map =
kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
GFP_KERNEL);
if ( z2ram_map == NULL )
{
printk( KERN_ERR DEVICE_NAME
": cannot get mem for z2ram_map\n" );
goto err_out;
}
while (size) {
z2ram_map[ z2ram_size++ ] = vaddr;
size -= Z2RAM_CHUNKSIZE;
vaddr += Z2RAM_CHUNKSIZE;
list_count++;
}
if ( z2ram_size != 0 )
printk( KERN_INFO DEVICE_NAME
": using %iK List Entry %d Memory\n",
list_count * Z2RAM_CHUNK1024, index );
} else
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" );
goto err_out;
}
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" );
goto err_out;
}
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" );
goto err_out;
}
get_chipram();
if ( z2ram_size != 0 )
printk( KERN_INFO DEVICE_NAME
": using %iK Chip RAM\n",
chip_count * Z2RAM_CHUNK1024 );
break;
default:
rc = -ENODEV;
goto err_out;
break;
}
if ( z2ram_size == 0 )
{
printk( KERN_NOTICE DEVICE_NAME
": no unused ZII/Chip RAM found\n" );
goto err_out_kfree;
}
current_device = device;
z2ram_size <<= Z2RAM_CHUNKSHIFT;
z2_sizes[ device ] = z2ram_size >> 10;
blk_size[ MAJOR_NR ] = z2_sizes;
}
return 0;
err_out_kfree:
kfree( z2ram_map );
err_out:
return rc;
}
static int
z2_release( struct inode *inode, struct file *filp )
{
if ( current_device == -1 )
return 0;
/*
* FIXME: unmap memory
*/
return 0;
}
static struct block_device_operations z2_fops =
{
owner: THIS_MODULE,
open: z2_open,
release: z2_release,
};
int __init
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;
}
{
/* Initialize size arrays. */
int i;
for (i = 0; i < Z2MINOR_COUNT; i++) {
z2_blocksizes[ i ] = 1024;
z2_sizes[ i ] = 0;
}
}
blk_init_queue(BLK_DEFAULT_QUEUE(MAJOR_NR), DEVICE_REQUEST);
blksize_size[ MAJOR_NR ] = z2_blocksizes;
blk_size[ MAJOR_NR ] = z2_sizes;
return 0;
}
#if defined(MODULE)
MODULE_LICENSE("GPL");
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");
blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR));
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
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