FRV: Use generic show_interrupts()
[cris-mirror.git] / drivers / block / z2ram.c
bloba22e3f895947e0193d7d1f0d8377ac715b142100
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>
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 extern int m68k_realnum_memory;
47 extern struct mem_info m68k_memory[NUM_MEMINFO];
49 #define Z2MINOR_COMBINED (0)
50 #define Z2MINOR_Z2ONLY (1)
51 #define Z2MINOR_CHIPONLY (2)
52 #define Z2MINOR_MEMLIST1 (4)
53 #define Z2MINOR_MEMLIST2 (5)
54 #define Z2MINOR_MEMLIST3 (6)
55 #define Z2MINOR_MEMLIST4 (7)
56 #define Z2MINOR_COUNT (8) /* Move this down when adding a new minor */
58 #define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
60 static DEFINE_MUTEX(z2ram_mutex);
61 static u_long *z2ram_map = NULL;
62 static u_long z2ram_size = 0;
63 static int z2_count = 0;
64 static int chip_count = 0;
65 static int list_count = 0;
66 static int current_device = -1;
68 static DEFINE_SPINLOCK(z2ram_lock);
70 static struct gendisk *z2ram_gendisk;
72 static void do_z2_request(struct request_queue *q)
74 struct request *req;
76 req = blk_fetch_request(q);
77 while (req) {
78 unsigned long start = blk_rq_pos(req) << 9;
79 unsigned long len = blk_rq_cur_bytes(req);
80 int err = 0;
82 if (start + len > z2ram_size) {
83 pr_err(DEVICE_NAME ": bad access: block=%llu, "
84 "count=%u\n",
85 (unsigned long long)blk_rq_pos(req),
86 blk_rq_cur_sectors(req));
87 err = -EIO;
88 goto done;
90 while (len) {
91 unsigned long addr = start & Z2RAM_CHUNKMASK;
92 unsigned long size = Z2RAM_CHUNKSIZE - addr;
93 if (len < size)
94 size = len;
95 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
96 if (rq_data_dir(req) == READ)
97 memcpy(req->buffer, (char *)addr, size);
98 else
99 memcpy((char *)addr, req->buffer, size);
100 start += size;
101 len -= size;
103 done:
104 if (!__blk_end_request_cur(req, err))
105 req = blk_fetch_request(q);
109 static void
110 get_z2ram( void )
112 int i;
114 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
116 if ( test_bit( i, zorro_unused_z2ram ) )
118 z2_count++;
119 z2ram_map[ z2ram_size++ ] =
120 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT );
121 clear_bit( i, zorro_unused_z2ram );
125 return;
128 static void
129 get_chipram( void )
132 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
134 chip_count++;
135 z2ram_map[ z2ram_size ] =
136 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
138 if ( z2ram_map[ z2ram_size ] == 0 )
140 break;
143 z2ram_size++;
146 return;
149 static int z2_open(struct block_device *bdev, fmode_t mode)
151 int device;
152 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
153 sizeof( z2ram_map[0] );
154 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
155 sizeof( z2ram_map[0] );
156 int rc = -ENOMEM;
158 device = MINOR(bdev->bd_dev);
160 mutex_lock(&z2ram_mutex);
161 if ( current_device != -1 && current_device != device )
163 rc = -EBUSY;
164 goto err_out;
167 if ( current_device == -1 )
169 z2_count = 0;
170 chip_count = 0;
171 list_count = 0;
172 z2ram_size = 0;
174 /* Use a specific list entry. */
175 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
176 int index = device - Z2MINOR_MEMLIST1 + 1;
177 unsigned long size, paddr, vaddr;
179 if (index >= m68k_realnum_memory) {
180 printk( KERN_ERR DEVICE_NAME
181 ": no such entry in z2ram_map\n" );
182 goto err_out;
185 paddr = m68k_memory[index].addr;
186 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
188 #ifdef __powerpc__
189 /* FIXME: ioremap doesn't build correct memory tables. */
191 vfree(vmalloc (size));
194 vaddr = (unsigned long) __ioremap (paddr, size,
195 _PAGE_WRITETHRU);
197 #else
198 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
199 #endif
200 z2ram_map =
201 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
202 GFP_KERNEL);
203 if ( z2ram_map == NULL )
205 printk( KERN_ERR DEVICE_NAME
206 ": cannot get mem for z2ram_map\n" );
207 goto err_out;
210 while (size) {
211 z2ram_map[ z2ram_size++ ] = vaddr;
212 size -= Z2RAM_CHUNKSIZE;
213 vaddr += Z2RAM_CHUNKSIZE;
214 list_count++;
217 if ( z2ram_size != 0 )
218 printk( KERN_INFO DEVICE_NAME
219 ": using %iK List Entry %d Memory\n",
220 list_count * Z2RAM_CHUNK1024, index );
221 } else
223 switch ( device )
225 case Z2MINOR_COMBINED:
227 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
228 if ( z2ram_map == NULL )
230 printk( KERN_ERR DEVICE_NAME
231 ": cannot get mem for z2ram_map\n" );
232 goto err_out;
235 get_z2ram();
236 get_chipram();
238 if ( z2ram_size != 0 )
239 printk( KERN_INFO DEVICE_NAME
240 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
241 z2_count * Z2RAM_CHUNK1024,
242 chip_count * Z2RAM_CHUNK1024,
243 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
245 break;
247 case Z2MINOR_Z2ONLY:
248 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
249 if ( z2ram_map == NULL )
251 printk( KERN_ERR DEVICE_NAME
252 ": cannot get mem for z2ram_map\n" );
253 goto err_out;
256 get_z2ram();
258 if ( z2ram_size != 0 )
259 printk( KERN_INFO DEVICE_NAME
260 ": using %iK of Zorro II RAM\n",
261 z2_count * Z2RAM_CHUNK1024 );
263 break;
265 case Z2MINOR_CHIPONLY:
266 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
267 if ( z2ram_map == NULL )
269 printk( KERN_ERR DEVICE_NAME
270 ": cannot get mem for z2ram_map\n" );
271 goto err_out;
274 get_chipram();
276 if ( z2ram_size != 0 )
277 printk( KERN_INFO DEVICE_NAME
278 ": using %iK Chip RAM\n",
279 chip_count * Z2RAM_CHUNK1024 );
281 break;
283 default:
284 rc = -ENODEV;
285 goto err_out;
287 break;
290 if ( z2ram_size == 0 )
292 printk( KERN_NOTICE DEVICE_NAME
293 ": no unused ZII/Chip RAM found\n" );
294 goto err_out_kfree;
297 current_device = device;
298 z2ram_size <<= Z2RAM_CHUNKSHIFT;
299 set_capacity(z2ram_gendisk, z2ram_size >> 9);
302 mutex_unlock(&z2ram_mutex);
303 return 0;
305 err_out_kfree:
306 kfree(z2ram_map);
307 err_out:
308 mutex_unlock(&z2ram_mutex);
309 return rc;
312 static int
313 z2_release(struct gendisk *disk, fmode_t mode)
315 mutex_lock(&z2ram_mutex);
316 if ( current_device == -1 ) {
317 mutex_unlock(&z2ram_mutex);
318 return 0;
320 mutex_unlock(&z2ram_mutex);
322 * FIXME: unmap memory
325 return 0;
328 static const struct block_device_operations z2_fops =
330 .owner = THIS_MODULE,
331 .open = z2_open,
332 .release = z2_release,
335 static struct kobject *z2_find(dev_t dev, int *part, void *data)
337 *part = 0;
338 return get_disk(z2ram_gendisk);
341 static struct request_queue *z2_queue;
343 static int __init
344 z2_init(void)
346 int ret;
348 if (!MACH_IS_AMIGA)
349 return -ENODEV;
351 ret = -EBUSY;
352 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
353 goto err;
355 ret = -ENOMEM;
356 z2ram_gendisk = alloc_disk(1);
357 if (!z2ram_gendisk)
358 goto out_disk;
360 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
361 if (!z2_queue)
362 goto out_queue;
364 z2ram_gendisk->major = Z2RAM_MAJOR;
365 z2ram_gendisk->first_minor = 0;
366 z2ram_gendisk->fops = &z2_fops;
367 sprintf(z2ram_gendisk->disk_name, "z2ram");
369 z2ram_gendisk->queue = z2_queue;
370 add_disk(z2ram_gendisk);
371 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
372 z2_find, NULL, NULL);
374 return 0;
376 out_queue:
377 put_disk(z2ram_gendisk);
378 out_disk:
379 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
380 err:
381 return ret;
384 static void __exit z2_exit(void)
386 int i, j;
387 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
388 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
389 del_gendisk(z2ram_gendisk);
390 put_disk(z2ram_gendisk);
391 blk_cleanup_queue(z2_queue);
393 if ( current_device != -1 )
395 i = 0;
397 for ( j = 0 ; j < z2_count; j++ )
399 set_bit( i++, zorro_unused_z2ram );
402 for ( j = 0 ; j < chip_count; j++ )
404 if ( z2ram_map[ i ] )
406 amiga_chip_free( (void *) z2ram_map[ i++ ] );
410 if ( z2ram_map != NULL )
412 kfree( z2ram_map );
416 return;
419 module_init(z2_init);
420 module_exit(z2_exit);
421 MODULE_LICENSE("GPL");