[mirror_ubuntu-bionic-kernel.git] / drivers / block / z2ram.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 <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;

static DEFINE_SPINLOCK(z2ram_lock);

static struct gendisk *z2ram_gendisk;

static void do_z2_request(struct request_queue *q)
{
	struct request *req;

	req = blk_fetch_request(q);
	while (req) {
		unsigned long start = blk_rq_pos(req) << 9;
		unsigned long len  = blk_rq_cur_bytes(req);
		blk_status_t err = BLK_STS_OK;

		if (start + len > z2ram_size) {
			pr_err(DEVICE_NAME ": bad access: block=%llu, "
			       "count=%u\n",
			       (unsigned long long)blk_rq_pos(req),
			       blk_rq_cur_sectors(req));
			err = BLK_STS_IOERR;
			goto done;
		}
		while (len) {
			unsigned long addr = start & Z2RAM_CHUNKMASK;
			unsigned long size = Z2RAM_CHUNKSIZE - addr;
			void *buffer = bio_data(req->bio);

			if (len < size)
				size = len;
			addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
			if (rq_data_dir(req) == READ)
				memcpy(buffer, (char *)addr, size);
			else
				memcpy((char *)addr, buffer, size);
			start += size;
			len -= size;
		}
	done:
		if (!__blk_end_request_cur(req, err))
			req = blk_fetch_request(q);
	}
}

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++] = (unsigned long)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 block_device *bdev, fmode_t mode)
{
    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 = MINOR(bdev->bd_dev);

    mutex_lock(&z2ram_mutex);
    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);
    }

    mutex_unlock(&z2ram_mutex);
    return 0;

err_out_kfree:
    kfree(z2ram_map);
err_out:
    mutex_unlock(&z2ram_mutex);
    return rc;
}

static void
z2_release(struct gendisk *disk, fmode_t mode)
{
    mutex_lock(&z2ram_mutex);
    if ( current_device == -1 ) {
    	mutex_unlock(&z2ram_mutex);
    	return;
    }
    mutex_unlock(&z2ram_mutex);
    /*
     * FIXME: unmap memory
     */
}

static const 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 -ENODEV;

    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), Z2MINOR_COUNT);
    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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	** z2ram - Amiga pseudo-driver to access 16bit-RAM in ZorroII space
	3	** as a block device, to be used as a RAM disk or swap space
	4	**
	5	** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
	6	**
	7	** ++Geert: support for zorro_unused_z2ram, better range checking
	8	** ++roman: translate accesses via an array
	9	** ++Milan: support for ChipRAM usage
	10	** ++yambo: converted to 2.0 kernel
	11	** ++yambo: modularized and support added for 3 minor devices including:
	12	** MAJOR MINOR DESCRIPTION
	13	** ----- ----- ----------------------------------------------
	14	** 37 0 Use Zorro II and Chip ram
	15	** 37 1 Use only Zorro II ram
	16	** 37 2 Use only Chip ram
	17	** 37 4-7 Use memory list entry 1-4 (first is 0)
	18	** ++jskov: support for 1-4th memory list entry.
	19	**
	20	** Permission to use, copy, modify, and distribute this software and its
	21	** documentation for any purpose and without fee is hereby granted, provided
	22	** that the above copyright notice appear in all copies and that both that
	23	** copyright notice and this permission notice appear in supporting
	24	** documentation. This software is provided "as is" without express or
	25	** implied warranty.
	26	*/
	27
	28	#define DEVICE_NAME "Z2RAM"
	29
	30	#include <linux/major.h>
	31	#include <linux/vmalloc.h>
	32	#include <linux/init.h>
	33	#include <linux/module.h>
	34	#include <linux/blkdev.h>
	35	#include <linux/bitops.h>
2a48fc0a	36	#include <linux/mutex.h>
5a0e3ad6	37	#include <linux/slab.h>
1da177e4 LT	38
	39	#include <asm/setup.h>
	40	#include <asm/amigahw.h>
	41	#include <asm/pgtable.h>
	42
	43	#include <linux/zorro.h>
	44
	45
1da177e4 LT	46	#define Z2MINOR_COMBINED (0)
	47	#define Z2MINOR_Z2ONLY (1)
	48	#define Z2MINOR_CHIPONLY (2)
	49	#define Z2MINOR_MEMLIST1 (4)
	50	#define Z2MINOR_MEMLIST2 (5)
	51	#define Z2MINOR_MEMLIST3 (6)
	52	#define Z2MINOR_MEMLIST4 (7)
	53	#define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */
	54
	55	#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
	56
2a48fc0a	57	static DEFINE_MUTEX(z2ram_mutex);
1da177e4 LT	58	static u_long *z2ram_map = NULL;
	59	static u_long z2ram_size = 0;
	60	static int z2_count = 0;
	61	static int chip_count = 0;
	62	static int list_count = 0;
	63	static int current_device = -1;
	64
	65	static DEFINE_SPINLOCK(z2ram_lock);
	66
1da177e4 LT	67	static struct gendisk *z2ram_gendisk;
1da177e4 LT	68
165125e1	69	static void do_z2_request(struct request_queue *q)
1da177e4 LT	70	{
1da177e4 LT	71	struct request *req;
fb3ac7f6	72
9934c8c0	73	req = blk_fetch_request(q);
fb3ac7f6	74	while (req) {
83096ebf	75	unsigned long start = blk_rq_pos(req) << 9;
1011c1b9	76	unsigned long len = blk_rq_cur_bytes(req);
2a842aca	77	blk_status_t err = BLK_STS_OK;
1da177e4 LT	78
1da177e4 LT	79	if (start + len > z2ram_size) {
e1fbd921 GU	80	pr_err(DEVICE_NAME ": bad access: block=%llu, "
	81	"count=%u\n",
	82	(unsigned long long)blk_rq_pos(req),
	83	blk_rq_cur_sectors(req));
2a842aca	84	err = BLK_STS_IOERR;
fb3ac7f6	85	goto done;
1da177e4 LT	86	}
	87	while (len) {
	88	unsigned long addr = start & Z2RAM_CHUNKMASK;
	89	unsigned long size = Z2RAM_CHUNKSIZE - addr;
b4f42e28 JA	90	void *buffer = bio_data(req->bio);
b4f42e28 JA	91
1da177e4 LT	92	if (len < size)
	93	size = len;
	94	addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
	95	if (rq_data_dir(req) == READ)
b4f42e28	96	memcpy(buffer, (char *)addr, size);
1da177e4	97	else
b4f42e28	98	memcpy((char *)addr, buffer, size);
1da177e4 LT	99	start += size;
	100	len -= size;
	101	}
fb3ac7f6	102	done:
9934c8c0 TH	103	if (!__blk_end_request_cur(req, err))
9934c8c0 TH	104	req = blk_fetch_request(q);
1da177e4 LT	105	}
	106	}
	107
	108	static void
	109	get_z2ram( void )
	110	{
	111	int i;
	112
	113	for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
	114	{
	115	if ( test_bit( i, zorro_unused_z2ram ) )
	116	{
	117	z2_count++;
6112ea08 GU	118	z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) +
6112ea08 GU	119	(i << Z2RAM_CHUNKSHIFT);
1da177e4 LT	120	clear_bit( i, zorro_unused_z2ram );
	121	}
	122	}
	123
	124	return;
	125	}
	126
	127	static void
	128	get_chipram( void )
	129	{
	130
	131	while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
	132	{
	133	chip_count++;
	134	z2ram_map[ z2ram_size ] =
	135	(u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
	136
	137	if ( z2ram_map[ z2ram_size ] == 0 )
	138	{
	139	break;
	140	}
	141
	142	z2ram_size++;
	143	}
	144
	145	return;
	146	}
	147
ab746cb9	148	static int z2_open(struct block_device *bdev, fmode_t mode)
1da177e4 LT	149	{
	150	int device;
	151	int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
	152	sizeof( z2ram_map[0] );
	153	int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
	154	sizeof( z2ram_map[0] );
	155	int rc = -ENOMEM;
	156
ab746cb9	157	device = MINOR(bdev->bd_dev);
1da177e4	158
2a48fc0a	159	mutex_lock(&z2ram_mutex);
1da177e4 LT	160	if ( current_device != -1 && current_device != device )
	161	{
	162	rc = -EBUSY;
	163	goto err_out;
	164	}
	165
	166	if ( current_device == -1 )
	167	{
	168	z2_count = 0;
	169	chip_count = 0;
	170	list_count = 0;
	171	z2ram_size = 0;
	172
	173	/* Use a specific list entry. */
	174	if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
	175	int index = device - Z2MINOR_MEMLIST1 + 1;
	176	unsigned long size, paddr, vaddr;
	177
	178	if (index >= m68k_realnum_memory) {
	179	printk( KERN_ERR DEVICE_NAME
	180	": no such entry in z2ram_map\n" );
	181	goto err_out;
	182	}
	183
	184	paddr = m68k_memory[index].addr;
	185	size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
	186
	187	#ifdef __powerpc__
	188	/* FIXME: ioremap doesn't build correct memory tables. */
	189	{
	190	vfree(vmalloc (size));
	191	}
	192
	193	vaddr = (unsigned long) __ioremap (paddr, size,
	194	_PAGE_WRITETHRU);
	195
	196	#else
	197	vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
	198	#endif
	199	z2ram_map =
	200	kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
	201	GFP_KERNEL);
	202	if ( z2ram_map == NULL )
	203	{
	204	printk( KERN_ERR DEVICE_NAME
	205	": cannot get mem for z2ram_map\n" );
	206	goto err_out;
	207	}
	208
	209	while (size) {
	210	z2ram_map[ z2ram_size++ ] = vaddr;
	211	size -= Z2RAM_CHUNKSIZE;
	212	vaddr += Z2RAM_CHUNKSIZE;
	213	list_count++;
	214	}
	215
	216	if ( z2ram_size != 0 )
	217	printk( KERN_INFO DEVICE_NAME
	218	": using %iK List Entry %d Memory\n",
	219	list_count * Z2RAM_CHUNK1024, index );
	220	} else
	221
	222	switch ( device )
	223	{
224	case Z2MINOR_COMBINED:
225
226	z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
227	if ( z2ram_map == NULL )
228	{
229	printk( KERN_ERR DEVICE_NAME
230	": cannot get mem for z2ram_map\n" );
231	goto err_out;
232	}
233
234	get_z2ram();
235	get_chipram();
236
237	if ( z2ram_size != 0 )
238	printk( KERN_INFO DEVICE_NAME
239	": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
240	z2_count * Z2RAM_CHUNK1024,
241	chip_count * Z2RAM_CHUNK1024,
242	( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
243
244	break;
245
246	case Z2MINOR_Z2ONLY:
247	z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
248	if ( z2ram_map == NULL )
249	{
250	printk( KERN_ERR DEVICE_NAME
251	": cannot get mem for z2ram_map\n" );
252	goto err_out;
253	}
254
255	get_z2ram();
256
257	if ( z2ram_size != 0 )
258	printk( KERN_INFO DEVICE_NAME
259	": using %iK of Zorro II RAM\n",
260	z2_count * Z2RAM_CHUNK1024 );
261
262	break;
263
264	case Z2MINOR_CHIPONLY:
265	z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
266	if ( z2ram_map == NULL )
267	{
268	printk( KERN_ERR DEVICE_NAME
269	": cannot get mem for z2ram_map\n" );
270	goto err_out;
271	}
272
273	get_chipram();
274
275	if ( z2ram_size != 0 )
276	printk( KERN_INFO DEVICE_NAME
277	": using %iK Chip RAM\n",
278	chip_count * Z2RAM_CHUNK1024 );
279
280	break;
281
282	default:
283	rc = -ENODEV;
284	goto err_out;
285
286	break;
287	}
288
289	if ( z2ram_size == 0 )
290	{
291	printk( KERN_NOTICE DEVICE_NAME
292	": no unused ZII/Chip RAM found\n" );
293	goto err_out_kfree;
294	}
295
296	current_device = device;
297	z2ram_size <<= Z2RAM_CHUNKSHIFT;
298	set_capacity(z2ram_gendisk, z2ram_size >> 9);
299	}
300
2a48fc0a	301	mutex_unlock(&z2ram_mutex);
1da177e4 LT	302	return 0;
	303
	304	err_out_kfree:
f9101210	305	kfree(z2ram_map);
1da177e4	306	err_out:
2a48fc0a	307	mutex_unlock(&z2ram_mutex);
1da177e4 LT	308	return rc;
	309	}
	310
db2a144b	311	static void
ab746cb9	312	z2_release(struct gendisk *disk, fmode_t mode)
1da177e4	313	{
2a48fc0a	314	mutex_lock(&z2ram_mutex);
6e9624b8	315	if ( current_device == -1 ) {
2a48fc0a	316	mutex_unlock(&z2ram_mutex);
db2a144b	317	return;
6e9624b8	318	}
2a48fc0a	319	mutex_unlock(&z2ram_mutex);
1da177e4 LT	320	/*
	321	* FIXME: unmap memory
	322	*/
1da177e4 LT	323	}
1da177e4 LT	324
83d5cde4	325	static const struct block_device_operations z2_fops =
1da177e4 LT	326	{
1da177e4 LT	327	.owner = THIS_MODULE,
ab746cb9 AV	328	.open = z2_open,
ab746cb9 AV	329	.release = z2_release,
1da177e4 LT	330	};
	331
	332	static struct kobject z2_find(dev_t dev, int part, void *data)
	333	{
	334	*part = 0;
	335	return get_disk(z2ram_gendisk);
	336	}
	337
	338	static struct request_queue *z2_queue;
	339
f39d88ad	340	static int __init
1da177e4 LT	341	z2_init(void)
	342	{
	343	int ret;
	344
	345	if (!MACH_IS_AMIGA)
fd5b462f	346	return -ENODEV;
1da177e4 LT	347
	348	ret = -EBUSY;
	349	if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
	350	goto err;
	351
	352	ret = -ENOMEM;
	353	z2ram_gendisk = alloc_disk(1);
	354	if (!z2ram_gendisk)
	355	goto out_disk;
	356
	357	z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
	358	if (!z2_queue)
	359	goto out_queue;
	360
	361	z2ram_gendisk->major = Z2RAM_MAJOR;
	362	z2ram_gendisk->first_minor = 0;
	363	z2ram_gendisk->fops = &z2_fops;
	364	sprintf(z2ram_gendisk->disk_name, "z2ram");
1da177e4 LT	365
	366	z2ram_gendisk->queue = z2_queue;
	367	add_disk(z2ram_gendisk);
	368	blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
	369	z2_find, NULL, NULL);
	370
	371	return 0;
	372
	373	out_queue:
	374	put_disk(z2ram_gendisk);
	375	out_disk:
	376	unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
	377	err:
	378	return ret;
	379	}
	380
f39d88ad	381	static void __exit z2_exit(void)
1da177e4 LT	382	{
1da177e4 LT	383	int i, j;
c9d4bc28	384	blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
00d59405	385	unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
1da177e4 LT	386	del_gendisk(z2ram_gendisk);
	387	put_disk(z2ram_gendisk);
	388	blk_cleanup_queue(z2_queue);
	389
	390	if ( current_device != -1 )
	391	{
	392	i = 0;
	393
	394	for ( j = 0 ; j < z2_count; j++ )
	395	{
	396	set_bit( i++, zorro_unused_z2ram );
	397	}
	398
	399	for ( j = 0 ; j < chip_count; j++ )
	400	{
	401	if ( z2ram_map[ i ] )
	402	{
	403	amiga_chip_free( (void *) z2ram_map[ i++ ] );
	404	}
	405	}
	406
	407	if ( z2ram_map != NULL )
	408	{
	409	kfree( z2ram_map );
	410	}
	411	}
	412
	413	return;
	414	}
f39d88ad AV	415
	416	module_init(z2_init);
	417	module_exit(z2_exit);
	418	MODULE_LICENSE("GPL");