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v3.15
  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>
 36#include <linux/mutex.h>
 37#include <linux/slab.h>
 38
 39#include <asm/setup.h>
 40#include <asm/amigahw.h>
 41#include <asm/pgtable.h>
 42
 43#include <linux/zorro.h>
 44
 45
 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
 57static DEFINE_MUTEX(z2ram_mutex);
 58static u_long *z2ram_map    = NULL;
 59static u_long z2ram_size    = 0;
 60static int z2_count         = 0;
 61static int chip_count       = 0;
 62static int list_count       = 0;
 63static int current_device   = -1;
 64
 65static DEFINE_SPINLOCK(z2ram_lock);
 66
 67static struct gendisk *z2ram_gendisk;
 68
 69static void do_z2_request(struct request_queue *q)
 70{
 71	struct request *req;
 72
 73	req = blk_fetch_request(q);
 74	while (req) {
 75		unsigned long start = blk_rq_pos(req) << 9;
 76		unsigned long len  = blk_rq_cur_bytes(req);
 77		int err = 0;
 78
 79		if (start + len > z2ram_size) {
 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));
 84			err = -EIO;
 85			goto done;
 86		}
 87		while (len) {
 88			unsigned long addr = start & Z2RAM_CHUNKMASK;
 89			unsigned long size = Z2RAM_CHUNKSIZE - addr;
 
 
 90			if (len < size)
 91				size = len;
 92			addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
 93			if (rq_data_dir(req) == READ)
 94				memcpy(req->buffer, (char *)addr, size);
 95			else
 96				memcpy((char *)addr, req->buffer, size);
 97			start += size;
 98			len -= size;
 99		}
100	done:
101		if (!__blk_end_request_cur(req, err))
102			req = blk_fetch_request(q);
103	}
104}
105
106static void
107get_z2ram( void )
108{
109    int i;
110
111    for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
112    {
113	if ( test_bit( i, zorro_unused_z2ram ) )
114	{
115	    z2_count++;
116	    z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) +
117				      (i << Z2RAM_CHUNKSHIFT);
118	    clear_bit( i, zorro_unused_z2ram );
119	}
120    }
121
122    return;
123}
124
125static void
126get_chipram( void )
127{
128
129    while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
130    {
131	chip_count++;
132	z2ram_map[ z2ram_size ] =
133	    (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
134
135	if ( z2ram_map[ z2ram_size ] == 0 )
136	{
137	    break;
138	}
139
140	z2ram_size++;
141    }
142	
143    return;
144}
145
146static int z2_open(struct block_device *bdev, fmode_t mode)
147{
148    int device;
149    int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
150	sizeof( z2ram_map[0] );
151    int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
152	sizeof( z2ram_map[0] );
153    int rc = -ENOMEM;
154
155    device = MINOR(bdev->bd_dev);
156
157    mutex_lock(&z2ram_mutex);
158    if ( current_device != -1 && current_device != device )
159    {
160	rc = -EBUSY;
161	goto err_out;
162    }
163
164    if ( current_device == -1 )
165    {
166	z2_count   = 0;
167	chip_count = 0;
168	list_count = 0;
169	z2ram_size = 0;
170
171	/* Use a specific list entry. */
172	if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
173		int index = device - Z2MINOR_MEMLIST1 + 1;
174		unsigned long size, paddr, vaddr;
175
176		if (index >= m68k_realnum_memory) {
177			printk( KERN_ERR DEVICE_NAME
178				": no such entry in z2ram_map\n" );
179		        goto err_out;
180		}
181
182		paddr = m68k_memory[index].addr;
183		size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
184
185#ifdef __powerpc__
186		/* FIXME: ioremap doesn't build correct memory tables. */
187		{
188			vfree(vmalloc (size));
189		}
190
191		vaddr = (unsigned long) __ioremap (paddr, size, 
192						   _PAGE_WRITETHRU);
193
194#else
195		vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
196#endif
197		z2ram_map = 
198			kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
199				GFP_KERNEL);
200		if ( z2ram_map == NULL )
201		{
202		    printk( KERN_ERR DEVICE_NAME
203			": cannot get mem for z2ram_map\n" );
204		    goto err_out;
205		}
206
207		while (size) {
208			z2ram_map[ z2ram_size++ ] = vaddr;
209			size -= Z2RAM_CHUNKSIZE;
210			vaddr += Z2RAM_CHUNKSIZE;
211			list_count++;
212		}
213
214		if ( z2ram_size != 0 )
215		    printk( KERN_INFO DEVICE_NAME
216			": using %iK List Entry %d Memory\n",
217			list_count * Z2RAM_CHUNK1024, index );
218	} else
219
220	switch ( device )
221	{
222	    case Z2MINOR_COMBINED:
223
224		z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
225		if ( z2ram_map == NULL )
226		{
227		    printk( KERN_ERR DEVICE_NAME
228			": cannot get mem for z2ram_map\n" );
229		    goto err_out;
230		}
231
232		get_z2ram();
233		get_chipram();
234
235		if ( z2ram_size != 0 )
236		    printk( KERN_INFO DEVICE_NAME 
237			": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
238			z2_count * Z2RAM_CHUNK1024,
239			chip_count * Z2RAM_CHUNK1024,
240			( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
241
242	    break;
243
244    	    case Z2MINOR_Z2ONLY:
245		z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
246		if ( z2ram_map == NULL )
247		{
248		    printk( KERN_ERR DEVICE_NAME
249			": cannot get mem for z2ram_map\n" );
250		    goto err_out;
251		}
252
253		get_z2ram();
254
255		if ( z2ram_size != 0 )
256		    printk( KERN_INFO DEVICE_NAME 
257			": using %iK of Zorro II RAM\n",
258			z2_count * Z2RAM_CHUNK1024 );
259
260	    break;
261
262	    case Z2MINOR_CHIPONLY:
263		z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
264		if ( z2ram_map == NULL )
265		{
266		    printk( KERN_ERR DEVICE_NAME
267			": cannot get mem for z2ram_map\n" );
268		    goto err_out;
269		}
270
271		get_chipram();
272
273		if ( z2ram_size != 0 )
274		    printk( KERN_INFO DEVICE_NAME 
275			": using %iK Chip RAM\n",
276			chip_count * Z2RAM_CHUNK1024 );
277		    
278	    break;
279
280	    default:
281		rc = -ENODEV;
282		goto err_out;
283	
284	    break;
285	}
286
287	if ( z2ram_size == 0 )
288	{
289	    printk( KERN_NOTICE DEVICE_NAME
290		": no unused ZII/Chip RAM found\n" );
291	    goto err_out_kfree;
292	}
293
294	current_device = device;
295	z2ram_size <<= Z2RAM_CHUNKSHIFT;
296	set_capacity(z2ram_gendisk, z2ram_size >> 9);
297    }
298
299    mutex_unlock(&z2ram_mutex);
300    return 0;
301
302err_out_kfree:
303    kfree(z2ram_map);
304err_out:
305    mutex_unlock(&z2ram_mutex);
306    return rc;
307}
308
309static void
310z2_release(struct gendisk *disk, fmode_t mode)
311{
312    mutex_lock(&z2ram_mutex);
313    if ( current_device == -1 ) {
314    	mutex_unlock(&z2ram_mutex);
315    	return;
316    }
317    mutex_unlock(&z2ram_mutex);
318    /*
319     * FIXME: unmap memory
320     */
321}
322
323static const struct block_device_operations z2_fops =
324{
325	.owner		= THIS_MODULE,
326	.open		= z2_open,
327	.release	= z2_release,
328};
329
330static struct kobject *z2_find(dev_t dev, int *part, void *data)
331{
332	*part = 0;
333	return get_disk(z2ram_gendisk);
334}
335
336static struct request_queue *z2_queue;
337
338static int __init 
339z2_init(void)
340{
341    int ret;
342
343    if (!MACH_IS_AMIGA)
344	return -ENODEV;
345
346    ret = -EBUSY;
347    if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
348	goto err;
349
350    ret = -ENOMEM;
351    z2ram_gendisk = alloc_disk(1);
352    if (!z2ram_gendisk)
353	goto out_disk;
354
355    z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
356    if (!z2_queue)
357	goto out_queue;
358
359    z2ram_gendisk->major = Z2RAM_MAJOR;
360    z2ram_gendisk->first_minor = 0;
361    z2ram_gendisk->fops = &z2_fops;
362    sprintf(z2ram_gendisk->disk_name, "z2ram");
363
364    z2ram_gendisk->queue = z2_queue;
365    add_disk(z2ram_gendisk);
366    blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
367				z2_find, NULL, NULL);
368
369    return 0;
370
371out_queue:
372    put_disk(z2ram_gendisk);
373out_disk:
374    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
375err:
376    return ret;
377}
378
379static void __exit z2_exit(void)
380{
381    int i, j;
382    blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
383    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
384    del_gendisk(z2ram_gendisk);
385    put_disk(z2ram_gendisk);
386    blk_cleanup_queue(z2_queue);
387
388    if ( current_device != -1 )
389    {
390	i = 0;
391
392	for ( j = 0 ; j < z2_count; j++ )
393	{
394	    set_bit( i++, zorro_unused_z2ram ); 
395	}
396
397	for ( j = 0 ; j < chip_count; j++ )
398	{
399	    if ( z2ram_map[ i ] )
400	    {
401		amiga_chip_free( (void *) z2ram_map[ i++ ] );
402	    }
403	}
404
405	if ( z2ram_map != NULL )
406	{
407	    kfree( z2ram_map );
408	}
409    }
410
411    return;
412} 
413
414module_init(z2_init);
415module_exit(z2_exit);
416MODULE_LICENSE("GPL");
v4.6
  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>
 36#include <linux/mutex.h>
 37#include <linux/slab.h>
 38
 39#include <asm/setup.h>
 40#include <asm/amigahw.h>
 41#include <asm/pgtable.h>
 42
 43#include <linux/zorro.h>
 44
 45
 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
 57static DEFINE_MUTEX(z2ram_mutex);
 58static u_long *z2ram_map    = NULL;
 59static u_long z2ram_size    = 0;
 60static int z2_count         = 0;
 61static int chip_count       = 0;
 62static int list_count       = 0;
 63static int current_device   = -1;
 64
 65static DEFINE_SPINLOCK(z2ram_lock);
 66
 67static struct gendisk *z2ram_gendisk;
 68
 69static void do_z2_request(struct request_queue *q)
 70{
 71	struct request *req;
 72
 73	req = blk_fetch_request(q);
 74	while (req) {
 75		unsigned long start = blk_rq_pos(req) << 9;
 76		unsigned long len  = blk_rq_cur_bytes(req);
 77		int err = 0;
 78
 79		if (start + len > z2ram_size) {
 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));
 84			err = -EIO;
 85			goto done;
 86		}
 87		while (len) {
 88			unsigned long addr = start & Z2RAM_CHUNKMASK;
 89			unsigned long size = Z2RAM_CHUNKSIZE - addr;
 90			void *buffer = bio_data(req->bio);
 91
 92			if (len < size)
 93				size = len;
 94			addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
 95			if (rq_data_dir(req) == READ)
 96				memcpy(buffer, (char *)addr, size);
 97			else
 98				memcpy((char *)addr, buffer, size);
 99			start += size;
100			len -= size;
101		}
102	done:
103		if (!__blk_end_request_cur(req, err))
104			req = blk_fetch_request(q);
105	}
106}
107
108static void
109get_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++;
118	    z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) +
119				      (i << Z2RAM_CHUNKSHIFT);
120	    clear_bit( i, zorro_unused_z2ram );
121	}
122    }
123
124    return;
125}
126
127static void
128get_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
148static int z2_open(struct block_device *bdev, fmode_t mode)
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
157    device = MINOR(bdev->bd_dev);
158
159    mutex_lock(&z2ram_mutex);
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
301    mutex_unlock(&z2ram_mutex);
302    return 0;
303
304err_out_kfree:
305    kfree(z2ram_map);
306err_out:
307    mutex_unlock(&z2ram_mutex);
308    return rc;
309}
310
311static void
312z2_release(struct gendisk *disk, fmode_t mode)
313{
314    mutex_lock(&z2ram_mutex);
315    if ( current_device == -1 ) {
316    	mutex_unlock(&z2ram_mutex);
317    	return;
318    }
319    mutex_unlock(&z2ram_mutex);
320    /*
321     * FIXME: unmap memory
322     */
323}
324
325static const struct block_device_operations z2_fops =
326{
327	.owner		= THIS_MODULE,
328	.open		= z2_open,
329	.release	= z2_release,
330};
331
332static struct kobject *z2_find(dev_t dev, int *part, void *data)
333{
334	*part = 0;
335	return get_disk(z2ram_gendisk);
336}
337
338static struct request_queue *z2_queue;
339
340static int __init 
341z2_init(void)
342{
343    int ret;
344
345    if (!MACH_IS_AMIGA)
346	return -ENODEV;
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");
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
373out_queue:
374    put_disk(z2ram_gendisk);
375out_disk:
376    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
377err:
378    return ret;
379}
380
381static void __exit z2_exit(void)
382{
383    int i, j;
384    blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
385    unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
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} 
415
416module_init(z2_init);
417module_exit(z2_exit);
418MODULE_LICENSE("GPL");