mirror of
https://github.com/torvalds/linux.git
synced 2024-11-23 12:42:02 +00:00
165125e1e4
Some of the code has been gradually transitioned to using the proper struct request_queue, but there's lots left. So do a full sweet of the kernel and get rid of this typedef and replace its uses with the proper type. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
408 lines
8.8 KiB
C
408 lines
8.8 KiB
C
/*
|
|
** 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/blkdev.h>
|
|
#include <linux/bitops.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/amigahw.h>
|
|
#include <asm/pgtable.h>
|
|
|
|
#include <linux/zorro.h>
|
|
|
|
|
|
extern int m68k_realnum_memory;
|
|
extern struct mem_info m68k_memory[NUM_MEMINFO];
|
|
|
|
#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_count = 0;
|
|
static int chip_count = 0;
|
|
static int list_count = 0;
|
|
static int current_device = -1;
|
|
|
|
static DEFINE_SPINLOCK(z2ram_lock);
|
|
|
|
static struct block_device_operations z2_fops;
|
|
static struct gendisk *z2ram_gendisk;
|
|
|
|
static void do_z2_request(struct request_queue *q)
|
|
{
|
|
struct request *req;
|
|
while ((req = elv_next_request(q)) != NULL) {
|
|
unsigned long start = req->sector << 9;
|
|
unsigned long len = req->current_nr_sectors << 9;
|
|
|
|
if (start + len > z2ram_size) {
|
|
printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
|
|
req->sector, req->current_nr_sectors);
|
|
end_request(req, 0);
|
|
continue;
|
|
}
|
|
while (len) {
|
|
unsigned long addr = start & Z2RAM_CHUNKMASK;
|
|
unsigned long size = Z2RAM_CHUNKSIZE - addr;
|
|
if (len < size)
|
|
size = len;
|
|
addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
|
|
if (rq_data_dir(req) == READ)
|
|
memcpy(req->buffer, (char *)addr, size);
|
|
else
|
|
memcpy((char *)addr, req->buffer, size);
|
|
start += size;
|
|
len -= size;
|
|
}
|
|
end_request(req, 1);
|
|
}
|
|
}
|
|
|
|
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 = iminor(inode);
|
|
|
|
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)z_remap_nocache_nonser(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;
|
|
set_capacity(z2ram_gendisk, z2ram_size >> 9);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
static struct kobject *z2_find(dev_t dev, int *part, void *data)
|
|
{
|
|
*part = 0;
|
|
return get_disk(z2ram_gendisk);
|
|
}
|
|
|
|
static struct request_queue *z2_queue;
|
|
|
|
static int __init
|
|
z2_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!MACH_IS_AMIGA)
|
|
return -ENXIO;
|
|
|
|
ret = -EBUSY;
|
|
if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
|
|
goto err;
|
|
|
|
ret = -ENOMEM;
|
|
z2ram_gendisk = alloc_disk(1);
|
|
if (!z2ram_gendisk)
|
|
goto out_disk;
|
|
|
|
z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
|
|
if (!z2_queue)
|
|
goto out_queue;
|
|
|
|
z2ram_gendisk->major = Z2RAM_MAJOR;
|
|
z2ram_gendisk->first_minor = 0;
|
|
z2ram_gendisk->fops = &z2_fops;
|
|
sprintf(z2ram_gendisk->disk_name, "z2ram");
|
|
|
|
z2ram_gendisk->queue = z2_queue;
|
|
add_disk(z2ram_gendisk);
|
|
blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
|
|
z2_find, NULL, NULL);
|
|
|
|
return 0;
|
|
|
|
out_queue:
|
|
put_disk(z2ram_gendisk);
|
|
out_disk:
|
|
unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
|
|
err:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit z2_exit(void)
|
|
{
|
|
int i, j;
|
|
blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
|
|
unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
|
|
del_gendisk(z2ram_gendisk);
|
|
put_disk(z2ram_gendisk);
|
|
blk_cleanup_queue(z2_queue);
|
|
|
|
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;
|
|
}
|
|
|
|
module_init(z2_init);
|
|
module_exit(z2_exit);
|
|
MODULE_LICENSE("GPL");
|