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
5 ** Copyright (C) 1994 by Ingo Wilken (Ingo.Wilken@informatik.uni-oldenburg.de)
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.
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
28 #define DEVICE_NAME "Z2RAM"
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>
39 #include <asm/setup.h>
40 #include <asm/amigahw.h>
41 #include <asm/pgtable.h>
43 #include <linux/zorro.h>
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 */
55 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
57 static DEFINE_MUTEX(z2ram_mutex);
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;
65 static DEFINE_SPINLOCK(z2ram_lock);
67 static struct gendisk *z2ram_gendisk;
69 static void do_z2_request(struct request_queue *q)
73 req = blk_fetch_request(q);
75 unsigned long start = blk_rq_pos(req) << 9;
76 unsigned long len = blk_rq_cur_bytes(req);
79 if (start + len > z2ram_size) {
80 pr_err(DEVICE_NAME ": bad access: block=%llu, "
82 (unsigned long long)blk_rq_pos(req),
83 blk_rq_cur_sectors(req));
88 unsigned long addr = start & Z2RAM_CHUNKMASK;
89 unsigned long size = Z2RAM_CHUNKSIZE - addr;
92 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
93 if (rq_data_dir(req) == READ)
94 memcpy(req->buffer, (char *)addr, size);
96 memcpy((char *)addr, req->buffer, size);
101 if (!__blk_end_request_cur(req, err))
102 req = blk_fetch_request(q);
111 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
113 if ( test_bit( i, zorro_unused_z2ram ) )
116 z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) +
117 (i << Z2RAM_CHUNKSHIFT);
118 clear_bit( i, zorro_unused_z2ram );
129 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
132 z2ram_map[ z2ram_size ] =
133 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
135 if ( z2ram_map[ z2ram_size ] == 0 )
146 static int z2_open(struct block_device *bdev, fmode_t mode)
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] );
155 device = MINOR(bdev->bd_dev);
157 mutex_lock(&z2ram_mutex);
158 if ( current_device != -1 && current_device != device )
164 if ( current_device == -1 )
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;
176 if (index >= m68k_realnum_memory) {
177 printk( KERN_ERR DEVICE_NAME
178 ": no such entry in z2ram_map\n" );
182 paddr = m68k_memory[index].addr;
183 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
186 /* FIXME: ioremap doesn't build correct memory tables. */
188 vfree(vmalloc (size));
191 vaddr = (unsigned long) __ioremap (paddr, size,
195 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
198 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
200 if ( z2ram_map == NULL )
202 printk( KERN_ERR DEVICE_NAME
203 ": cannot get mem for z2ram_map\n" );
208 z2ram_map[ z2ram_size++ ] = vaddr;
209 size -= Z2RAM_CHUNKSIZE;
210 vaddr += Z2RAM_CHUNKSIZE;
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 );
222 case Z2MINOR_COMBINED:
224 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
225 if ( z2ram_map == NULL )
227 printk( KERN_ERR DEVICE_NAME
228 ": cannot get mem for z2ram_map\n" );
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 );
245 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
246 if ( z2ram_map == NULL )
248 printk( KERN_ERR DEVICE_NAME
249 ": cannot get mem for z2ram_map\n" );
255 if ( z2ram_size != 0 )
256 printk( KERN_INFO DEVICE_NAME
257 ": using %iK of Zorro II RAM\n",
258 z2_count * Z2RAM_CHUNK1024 );
262 case Z2MINOR_CHIPONLY:
263 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
264 if ( z2ram_map == NULL )
266 printk( KERN_ERR DEVICE_NAME
267 ": cannot get mem for z2ram_map\n" );
273 if ( z2ram_size != 0 )
274 printk( KERN_INFO DEVICE_NAME
275 ": using %iK Chip RAM\n",
276 chip_count * Z2RAM_CHUNK1024 );
287 if ( z2ram_size == 0 )
289 printk( KERN_NOTICE DEVICE_NAME
290 ": no unused ZII/Chip RAM found\n" );
294 current_device = device;
295 z2ram_size <<= Z2RAM_CHUNKSHIFT;
296 set_capacity(z2ram_gendisk, z2ram_size >> 9);
299 mutex_unlock(&z2ram_mutex);
305 mutex_unlock(&z2ram_mutex);
310 z2_release(struct gendisk *disk, fmode_t mode)
312 mutex_lock(&z2ram_mutex);
313 if ( current_device == -1 ) {
314 mutex_unlock(&z2ram_mutex);
317 mutex_unlock(&z2ram_mutex);
319 * FIXME: unmap memory
323 static const struct block_device_operations z2_fops =
325 .owner = THIS_MODULE,
327 .release = z2_release,
330 static struct kobject *z2_find(dev_t dev, int *part, void *data)
333 return get_disk(z2ram_gendisk);
336 static struct request_queue *z2_queue;
347 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
351 z2ram_gendisk = alloc_disk(1);
355 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
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");
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);
372 put_disk(z2ram_gendisk);
374 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
379 static void __exit z2_exit(void)
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);
388 if ( current_device != -1 )
392 for ( j = 0 ; j < z2_count; j++ )
394 set_bit( i++, zorro_unused_z2ram );
397 for ( j = 0 ; j < chip_count; j++ )
399 if ( z2ram_map[ i ] )
401 amiga_chip_free( (void *) z2ram_map[ i++ ] );
405 if ( z2ram_map != NULL )
414 module_init(z2_init);
415 module_exit(z2_exit);
416 MODULE_LICENSE("GPL");