hso: add Vendor/Product ID's for new devices
[linux-2.6/linux-2.6-openrd.git] / drivers / block / z2ram.c
blob80754cdd31190c16d9c65e4e0538b979310b42cb
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.
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.
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>
37 #include <asm/setup.h>
38 #include <asm/amigahw.h>
39 #include <asm/pgtable.h>
41 #include <linux/zorro.h>
44 extern int m68k_realnum_memory;
45 extern struct mem_info m68k_memory[NUM_MEMINFO];
47 #define Z2MINOR_COMBINED (0)
48 #define Z2MINOR_Z2ONLY (1)
49 #define Z2MINOR_CHIPONLY (2)
50 #define Z2MINOR_MEMLIST1 (4)
51 #define Z2MINOR_MEMLIST2 (5)
52 #define Z2MINOR_MEMLIST3 (6)
53 #define Z2MINOR_MEMLIST4 (7)
54 #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */
56 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
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 block_device_operations z2_fops;
68 static struct gendisk *z2ram_gendisk;
70 static void do_z2_request(struct request_queue *q)
72 struct request *req;
73 while ((req = elv_next_request(q)) != NULL) {
74 unsigned long start = req->sector << 9;
75 unsigned long len = req->current_nr_sectors << 9;
77 if (start + len > z2ram_size) {
78 printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
79 req->sector, req->current_nr_sectors);
80 end_request(req, 0);
81 continue;
83 while (len) {
84 unsigned long addr = start & Z2RAM_CHUNKMASK;
85 unsigned long size = Z2RAM_CHUNKSIZE - addr;
86 if (len < size)
87 size = len;
88 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
89 if (rq_data_dir(req) == READ)
90 memcpy(req->buffer, (char *)addr, size);
91 else
92 memcpy((char *)addr, req->buffer, size);
93 start += size;
94 len -= size;
96 end_request(req, 1);
100 static void
101 get_z2ram( void )
103 int i;
105 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
107 if ( test_bit( i, zorro_unused_z2ram ) )
109 z2_count++;
110 z2ram_map[ z2ram_size++ ] =
111 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT );
112 clear_bit( i, zorro_unused_z2ram );
116 return;
119 static void
120 get_chipram( void )
123 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
125 chip_count++;
126 z2ram_map[ z2ram_size ] =
127 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
129 if ( z2ram_map[ z2ram_size ] == 0 )
131 break;
134 z2ram_size++;
137 return;
140 static int z2_open(struct block_device *bdev, fmode_t mode)
142 int device;
143 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
144 sizeof( z2ram_map[0] );
145 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
146 sizeof( z2ram_map[0] );
147 int rc = -ENOMEM;
149 device = MINOR(bdev->bd_dev);
151 if ( current_device != -1 && current_device != device )
153 rc = -EBUSY;
154 goto err_out;
157 if ( current_device == -1 )
159 z2_count = 0;
160 chip_count = 0;
161 list_count = 0;
162 z2ram_size = 0;
164 /* Use a specific list entry. */
165 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
166 int index = device - Z2MINOR_MEMLIST1 + 1;
167 unsigned long size, paddr, vaddr;
169 if (index >= m68k_realnum_memory) {
170 printk( KERN_ERR DEVICE_NAME
171 ": no such entry in z2ram_map\n" );
172 goto err_out;
175 paddr = m68k_memory[index].addr;
176 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
178 #ifdef __powerpc__
179 /* FIXME: ioremap doesn't build correct memory tables. */
181 vfree(vmalloc (size));
184 vaddr = (unsigned long) __ioremap (paddr, size,
185 _PAGE_WRITETHRU);
187 #else
188 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
189 #endif
190 z2ram_map =
191 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
192 GFP_KERNEL);
193 if ( z2ram_map == NULL )
195 printk( KERN_ERR DEVICE_NAME
196 ": cannot get mem for z2ram_map\n" );
197 goto err_out;
200 while (size) {
201 z2ram_map[ z2ram_size++ ] = vaddr;
202 size -= Z2RAM_CHUNKSIZE;
203 vaddr += Z2RAM_CHUNKSIZE;
204 list_count++;
207 if ( z2ram_size != 0 )
208 printk( KERN_INFO DEVICE_NAME
209 ": using %iK List Entry %d Memory\n",
210 list_count * Z2RAM_CHUNK1024, index );
211 } else
213 switch ( device )
215 case Z2MINOR_COMBINED:
217 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
218 if ( z2ram_map == NULL )
220 printk( KERN_ERR DEVICE_NAME
221 ": cannot get mem for z2ram_map\n" );
222 goto err_out;
225 get_z2ram();
226 get_chipram();
228 if ( z2ram_size != 0 )
229 printk( KERN_INFO DEVICE_NAME
230 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
231 z2_count * Z2RAM_CHUNK1024,
232 chip_count * Z2RAM_CHUNK1024,
233 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
235 break;
237 case Z2MINOR_Z2ONLY:
238 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
239 if ( z2ram_map == NULL )
241 printk( KERN_ERR DEVICE_NAME
242 ": cannot get mem for z2ram_map\n" );
243 goto err_out;
246 get_z2ram();
248 if ( z2ram_size != 0 )
249 printk( KERN_INFO DEVICE_NAME
250 ": using %iK of Zorro II RAM\n",
251 z2_count * Z2RAM_CHUNK1024 );
253 break;
255 case Z2MINOR_CHIPONLY:
256 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
257 if ( z2ram_map == NULL )
259 printk( KERN_ERR DEVICE_NAME
260 ": cannot get mem for z2ram_map\n" );
261 goto err_out;
264 get_chipram();
266 if ( z2ram_size != 0 )
267 printk( KERN_INFO DEVICE_NAME
268 ": using %iK Chip RAM\n",
269 chip_count * Z2RAM_CHUNK1024 );
271 break;
273 default:
274 rc = -ENODEV;
275 goto err_out;
277 break;
280 if ( z2ram_size == 0 )
282 printk( KERN_NOTICE DEVICE_NAME
283 ": no unused ZII/Chip RAM found\n" );
284 goto err_out_kfree;
287 current_device = device;
288 z2ram_size <<= Z2RAM_CHUNKSHIFT;
289 set_capacity(z2ram_gendisk, z2ram_size >> 9);
292 return 0;
294 err_out_kfree:
295 kfree(z2ram_map);
296 err_out:
297 return rc;
300 static int
301 z2_release(struct gendisk *disk, fmode_t mode)
303 if ( current_device == -1 )
304 return 0;
307 * FIXME: unmap memory
310 return 0;
313 static struct block_device_operations z2_fops =
315 .owner = THIS_MODULE,
316 .open = z2_open,
317 .release = z2_release,
320 static struct kobject *z2_find(dev_t dev, int *part, void *data)
322 *part = 0;
323 return get_disk(z2ram_gendisk);
326 static struct request_queue *z2_queue;
328 static int __init
329 z2_init(void)
331 int ret;
333 if (!MACH_IS_AMIGA)
334 return -ENODEV;
336 ret = -EBUSY;
337 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
338 goto err;
340 ret = -ENOMEM;
341 z2ram_gendisk = alloc_disk(1);
342 if (!z2ram_gendisk)
343 goto out_disk;
345 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
346 if (!z2_queue)
347 goto out_queue;
349 z2ram_gendisk->major = Z2RAM_MAJOR;
350 z2ram_gendisk->first_minor = 0;
351 z2ram_gendisk->fops = &z2_fops;
352 sprintf(z2ram_gendisk->disk_name, "z2ram");
354 z2ram_gendisk->queue = z2_queue;
355 add_disk(z2ram_gendisk);
356 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
357 z2_find, NULL, NULL);
359 return 0;
361 out_queue:
362 put_disk(z2ram_gendisk);
363 out_disk:
364 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
365 err:
366 return ret;
369 static void __exit z2_exit(void)
371 int i, j;
372 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
373 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
374 del_gendisk(z2ram_gendisk);
375 put_disk(z2ram_gendisk);
376 blk_cleanup_queue(z2_queue);
378 if ( current_device != -1 )
380 i = 0;
382 for ( j = 0 ; j < z2_count; j++ )
384 set_bit( i++, zorro_unused_z2ram );
387 for ( j = 0 ; j < chip_count; j++ )
389 if ( z2ram_map[ i ] )
391 amiga_chip_free( (void *) z2ram_map[ i++ ] );
395 if ( z2ram_map != NULL )
397 kfree( z2ram_map );
401 return;
404 module_init(z2_init);
405 module_exit(z2_exit);
406 MODULE_LICENSE("GPL");