tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
37#include <asm/setup.h>
38#include <asm/amigahw.h>
39#include <asm/pgtable.h>
40
41#include <linux/zorro.h>
42
43
44extern int m68k_realnum_memory;
45extern struct mem_info m68k_memory[NUM_MEMINFO];
46
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 */
55
56#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
57
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 printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
81 blk_rq_pos(req), blk_rq_cur_sectors(req));
82 err = -EIO;
83 goto done;
84 }
85 while (len) {
86 unsigned long addr = start & Z2RAM_CHUNKMASK;
87 unsigned long size = Z2RAM_CHUNKSIZE - addr;
88 if (len < size)
89 size = len;
90 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
91 if (rq_data_dir(req) == READ)
92 memcpy(req->buffer, (char *)addr, size);
93 else
94 memcpy((char *)addr, req->buffer, size);
95 start += size;
96 len -= size;
97 }
98 done:
99 if (!__blk_end_request_cur(req, err))
100 req = blk_fetch_request(q);
101 }
102}
103
104static void
105get_z2ram( void )
106{
107 int i;
108
109 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
110 {
111 if ( test_bit( i, zorro_unused_z2ram ) )
112 {
113 z2_count++;
114 z2ram_map[ z2ram_size++ ] =
115 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT );
116 clear_bit( i, zorro_unused_z2ram );
117 }
118 }
119
120 return;
121}
122
123static void
124get_chipram( void )
125{
126
127 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
128 {
129 chip_count++;
130 z2ram_map[ z2ram_size ] =
131 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
132
133 if ( z2ram_map[ z2ram_size ] == 0 )
134 {
135 break;
136 }
137
138 z2ram_size++;
139 }
140
141 return;
142}
143
144static int z2_open(struct block_device *bdev, fmode_t mode)
145{
146 int device;
147 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
148 sizeof( z2ram_map[0] );
149 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
150 sizeof( z2ram_map[0] );
151 int rc = -ENOMEM;
152
153 device = MINOR(bdev->bd_dev);
154
155 if ( current_device != -1 && current_device != device )
156 {
157 rc = -EBUSY;
158 goto err_out;
159 }
160
161 if ( current_device == -1 )
162 {
163 z2_count = 0;
164 chip_count = 0;
165 list_count = 0;
166 z2ram_size = 0;
167
168 /* Use a specific list entry. */
169 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
170 int index = device - Z2MINOR_MEMLIST1 + 1;
171 unsigned long size, paddr, vaddr;
172
173 if (index >= m68k_realnum_memory) {
174 printk( KERN_ERR DEVICE_NAME
175 ": no such entry in z2ram_map\n" );
176 goto err_out;
177 }
178
179 paddr = m68k_memory[index].addr;
180 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
181
182#ifdef __powerpc__
183 /* FIXME: ioremap doesn't build correct memory tables. */
184 {
185 vfree(vmalloc (size));
186 }
187
188 vaddr = (unsigned long) __ioremap (paddr, size,
189 _PAGE_WRITETHRU);
190
191#else
192 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
193#endif
194 z2ram_map =
195 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
196 GFP_KERNEL);
197 if ( z2ram_map == NULL )
198 {
199 printk( KERN_ERR DEVICE_NAME
200 ": cannot get mem for z2ram_map\n" );
201 goto err_out;
202 }
203
204 while (size) {
205 z2ram_map[ z2ram_size++ ] = vaddr;
206 size -= Z2RAM_CHUNKSIZE;
207 vaddr += Z2RAM_CHUNKSIZE;
208 list_count++;
209 }
210
211 if ( z2ram_size != 0 )
212 printk( KERN_INFO DEVICE_NAME
213 ": using %iK List Entry %d Memory\n",
214 list_count * Z2RAM_CHUNK1024, index );
215 } else
216
217 switch ( device )
218 {
219 case Z2MINOR_COMBINED:
220
221 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
222 if ( z2ram_map == NULL )
223 {
224 printk( KERN_ERR DEVICE_NAME
225 ": cannot get mem for z2ram_map\n" );
226 goto err_out;
227 }
228
229 get_z2ram();
230 get_chipram();
231
232 if ( z2ram_size != 0 )
233 printk( KERN_INFO DEVICE_NAME
234 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
235 z2_count * Z2RAM_CHUNK1024,
236 chip_count * Z2RAM_CHUNK1024,
237 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
238
239 break;
240
241 case Z2MINOR_Z2ONLY:
242 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
243 if ( z2ram_map == NULL )
244 {
245 printk( KERN_ERR DEVICE_NAME
246 ": cannot get mem for z2ram_map\n" );
247 goto err_out;
248 }
249
250 get_z2ram();
251
252 if ( z2ram_size != 0 )
253 printk( KERN_INFO DEVICE_NAME
254 ": using %iK of Zorro II RAM\n",
255 z2_count * Z2RAM_CHUNK1024 );
256
257 break;
258
259 case Z2MINOR_CHIPONLY:
260 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
261 if ( z2ram_map == NULL )
262 {
263 printk( KERN_ERR DEVICE_NAME
264 ": cannot get mem for z2ram_map\n" );
265 goto err_out;
266 }
267
268 get_chipram();
269
270 if ( z2ram_size != 0 )
271 printk( KERN_INFO DEVICE_NAME
272 ": using %iK Chip RAM\n",
273 chip_count * Z2RAM_CHUNK1024 );
274
275 break;
276
277 default:
278 rc = -ENODEV;
279 goto err_out;
280
281 break;
282 }
283
284 if ( z2ram_size == 0 )
285 {
286 printk( KERN_NOTICE DEVICE_NAME
287 ": no unused ZII/Chip RAM found\n" );
288 goto err_out_kfree;
289 }
290
291 current_device = device;
292 z2ram_size <<= Z2RAM_CHUNKSHIFT;
293 set_capacity(z2ram_gendisk, z2ram_size >> 9);
294 }
295
296 return 0;
297
298err_out_kfree:
299 kfree(z2ram_map);
300err_out:
301 return rc;
302}
303
304static int
305z2_release(struct gendisk *disk, fmode_t mode)
306{
307 if ( current_device == -1 )
308 return 0;
309
310 /*
311 * FIXME: unmap memory
312 */
313
314 return 0;
315}
316
317static const struct block_device_operations z2_fops =
318{
319 .owner = THIS_MODULE,
320 .open = z2_open,
321 .release = z2_release,
322};
323
324static struct kobject *z2_find(dev_t dev, int *part, void *data)
325{
326 *part = 0;
327 return get_disk(z2ram_gendisk);
328}
329
330static struct request_queue *z2_queue;
331
332static int __init
333z2_init(void)
334{
335 int ret;
336
337 if (!MACH_IS_AMIGA)
338 return -ENODEV;
339
340 ret = -EBUSY;
341 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
342 goto err;
343
344 ret = -ENOMEM;
345 z2ram_gendisk = alloc_disk(1);
346 if (!z2ram_gendisk)
347 goto out_disk;
348
349 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
350 if (!z2_queue)
351 goto out_queue;
352
353 z2ram_gendisk->major = Z2RAM_MAJOR;
354 z2ram_gendisk->first_minor = 0;
355 z2ram_gendisk->fops = &z2_fops;
356 sprintf(z2ram_gendisk->disk_name, "z2ram");
357
358 z2ram_gendisk->queue = z2_queue;
359 add_disk(z2ram_gendisk);
360 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
361 z2_find, NULL, NULL);
362
363 return 0;
364
365out_queue:
366 put_disk(z2ram_gendisk);
367out_disk:
368 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
369err:
370 return ret;
371}
372
373static void __exit z2_exit(void)
374{
375 int i, j;
376 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
377 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
378 del_gendisk(z2ram_gendisk);
379 put_disk(z2ram_gendisk);
380 blk_cleanup_queue(z2_queue);
381
382 if ( current_device != -1 )
383 {
384 i = 0;
385
386 for ( j = 0 ; j < z2_count; j++ )
387 {
388 set_bit( i++, zorro_unused_z2ram );
389 }
390
391 for ( j = 0 ; j < chip_count; j++ )
392 {
393 if ( z2ram_map[ i ] )
394 {
395 amiga_chip_free( (void *) z2ram_map[ i++ ] );
396 }
397 }
398
399 if ( z2ram_map != NULL )
400 {
401 kfree( z2ram_map );
402 }
403 }
404
405 return;
406}
407
408module_init(z2_init);
409module_exit(z2_exit);
410MODULE_LICENSE("GPL");