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 block_device_operations z2_fops;
68static struct gendisk *z2ram_gendisk;
69
70static void do_z2_request(struct request_queue *q)
71{
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;
76
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;
82 }
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;
95 }
96 end_request(req, 1);
97 }
98}
99
100static void
101get_z2ram( void )
102{
103 int i;
104
105 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
106 {
107 if ( test_bit( i, zorro_unused_z2ram ) )
108 {
109 z2_count++;
110 z2ram_map[ z2ram_size++ ] =
111 ZTWO_VADDR( Z2RAM_START ) + ( i << Z2RAM_CHUNKSHIFT );
112 clear_bit( i, zorro_unused_z2ram );
113 }
114 }
115
116 return;
117}
118
119static void
120get_chipram( void )
121{
122
123 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
124 {
125 chip_count++;
126 z2ram_map[ z2ram_size ] =
127 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
128
129 if ( z2ram_map[ z2ram_size ] == 0 )
130 {
131 break;
132 }
133
134 z2ram_size++;
135 }
136
137 return;
138}
139
140static int
141z2_open( struct inode *inode, struct file *filp )
142{
143 int device;
144 int max_z2_map = ( Z2RAM_SIZE / Z2RAM_CHUNKSIZE ) *
145 sizeof( z2ram_map[0] );
146 int max_chip_map = ( amiga_chip_size / Z2RAM_CHUNKSIZE ) *
147 sizeof( z2ram_map[0] );
148 int rc = -ENOMEM;
149
150 device = iminor(inode);
151
152 if ( current_device != -1 && current_device != device )
153 {
154 rc = -EBUSY;
155 goto err_out;
156 }
157
158 if ( current_device == -1 )
159 {
160 z2_count = 0;
161 chip_count = 0;
162 list_count = 0;
163 z2ram_size = 0;
164
165 /* Use a specific list entry. */
166 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
167 int index = device - Z2MINOR_MEMLIST1 + 1;
168 unsigned long size, paddr, vaddr;
169
170 if (index >= m68k_realnum_memory) {
171 printk( KERN_ERR DEVICE_NAME
172 ": no such entry in z2ram_map\n" );
173 goto err_out;
174 }
175
176 paddr = m68k_memory[index].addr;
177 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
178
179#ifdef __powerpc__
180 /* FIXME: ioremap doesn't build correct memory tables. */
181 {
182 vfree(vmalloc (size));
183 }
184
185 vaddr = (unsigned long) __ioremap (paddr, size,
186 _PAGE_WRITETHRU);
187
188#else
189 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
190#endif
191 z2ram_map =
192 kmalloc((size/Z2RAM_CHUNKSIZE)*sizeof(z2ram_map[0]),
193 GFP_KERNEL);
194 if ( z2ram_map == NULL )
195 {
196 printk( KERN_ERR DEVICE_NAME
197 ": cannot get mem for z2ram_map\n" );
198 goto err_out;
199 }
200
201 while (size) {
202 z2ram_map[ z2ram_size++ ] = vaddr;
203 size -= Z2RAM_CHUNKSIZE;
204 vaddr += Z2RAM_CHUNKSIZE;
205 list_count++;
206 }
207
208 if ( z2ram_size != 0 )
209 printk( KERN_INFO DEVICE_NAME
210 ": using %iK List Entry %d Memory\n",
211 list_count * Z2RAM_CHUNK1024, index );
212 } else
213
214 switch ( device )
215 {
216 case Z2MINOR_COMBINED:
217
218 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
219 if ( z2ram_map == NULL )
220 {
221 printk( KERN_ERR DEVICE_NAME
222 ": cannot get mem for z2ram_map\n" );
223 goto err_out;
224 }
225
226 get_z2ram();
227 get_chipram();
228
229 if ( z2ram_size != 0 )
230 printk( KERN_INFO DEVICE_NAME
231 ": using %iK Zorro II RAM and %iK Chip RAM (Total %dK)\n",
232 z2_count * Z2RAM_CHUNK1024,
233 chip_count * Z2RAM_CHUNK1024,
234 ( z2_count + chip_count ) * Z2RAM_CHUNK1024 );
235
236 break;
237
238 case Z2MINOR_Z2ONLY:
239 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
240 if ( z2ram_map == NULL )
241 {
242 printk( KERN_ERR DEVICE_NAME
243 ": cannot get mem for z2ram_map\n" );
244 goto err_out;
245 }
246
247 get_z2ram();
248
249 if ( z2ram_size != 0 )
250 printk( KERN_INFO DEVICE_NAME
251 ": using %iK of Zorro II RAM\n",
252 z2_count * Z2RAM_CHUNK1024 );
253
254 break;
255
256 case Z2MINOR_CHIPONLY:
257 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
258 if ( z2ram_map == NULL )
259 {
260 printk( KERN_ERR DEVICE_NAME
261 ": cannot get mem for z2ram_map\n" );
262 goto err_out;
263 }
264
265 get_chipram();
266
267 if ( z2ram_size != 0 )
268 printk( KERN_INFO DEVICE_NAME
269 ": using %iK Chip RAM\n",
270 chip_count * Z2RAM_CHUNK1024 );
271
272 break;
273
274 default:
275 rc = -ENODEV;
276 goto err_out;
277
278 break;
279 }
280
281 if ( z2ram_size == 0 )
282 {
283 printk( KERN_NOTICE DEVICE_NAME
284 ": no unused ZII/Chip RAM found\n" );
285 goto err_out_kfree;
286 }
287
288 current_device = device;
289 z2ram_size <<= Z2RAM_CHUNKSHIFT;
290 set_capacity(z2ram_gendisk, z2ram_size >> 9);
291 }
292
293 return 0;
294
295err_out_kfree:
296 kfree(z2ram_map);
297err_out:
298 return rc;
299}
300
301static int
302z2_release( struct inode *inode, struct file *filp )
303{
304 if ( current_device == -1 )
305 return 0;
306
307 /*
308 * FIXME: unmap memory
309 */
310
311 return 0;
312}
313
314static struct block_device_operations z2_fops =
315{
316 .owner = THIS_MODULE,
317 .open = z2_open,
318 .release = z2_release,
319};
320
321static struct kobject *z2_find(dev_t dev, int *part, void *data)
322{
323 *part = 0;
324 return get_disk(z2ram_gendisk);
325}
326
327static struct request_queue *z2_queue;
328
329static int __init
330z2_init(void)
331{
332 int ret;
333
334 if (!MACH_IS_AMIGA)
335 return -ENXIO;
336
337 ret = -EBUSY;
338 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
339 goto err;
340
341 ret = -ENOMEM;
342 z2ram_gendisk = alloc_disk(1);
343 if (!z2ram_gendisk)
344 goto out_disk;
345
346 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
347 if (!z2_queue)
348 goto out_queue;
349
350 z2ram_gendisk->major = Z2RAM_MAJOR;
351 z2ram_gendisk->first_minor = 0;
352 z2ram_gendisk->fops = &z2_fops;
353 sprintf(z2ram_gendisk->disk_name, "z2ram");
354
355 z2ram_gendisk->queue = z2_queue;
356 add_disk(z2ram_gendisk);
357 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
358 z2_find, NULL, NULL);
359
360 return 0;
361
362out_queue:
363 put_disk(z2ram_gendisk);
364out_disk:
365 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
366err:
367 return ret;
368}
369
370static void __exit z2_exit(void)
371{
372 int i, j;
373 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), 256);
374 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
375 del_gendisk(z2ram_gendisk);
376 put_disk(z2ram_gendisk);
377 blk_cleanup_queue(z2_queue);
378
379 if ( current_device != -1 )
380 {
381 i = 0;
382
383 for ( j = 0 ; j < z2_count; j++ )
384 {
385 set_bit( i++, zorro_unused_z2ram );
386 }
387
388 for ( j = 0 ; j < chip_count; j++ )
389 {
390 if ( z2ram_map[ i ] )
391 {
392 amiga_chip_free( (void *) z2ram_map[ i++ ] );
393 }
394 }
395
396 if ( z2ram_map != NULL )
397 {
398 kfree( z2ram_map );
399 }
400 }
401
402 return;
403}
404
405module_init(z2_init);
406module_exit(z2_exit);
407MODULE_LICENSE("GPL");