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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)
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 z2_open(struct block_device *bdev, fmode_t mode)
141{
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;
148
149 device = MINOR(bdev->bd_dev);
150
151 if ( current_device != -1 && current_device != device )
152 {
153 rc = -EBUSY;
154 goto err_out;
155 }
156
157 if ( current_device == -1 )
158 {
159 z2_count = 0;
160 chip_count = 0;
161 list_count = 0;
162 z2ram_size = 0;
163
164
165 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
166 int index = device - Z2MINOR_MEMLIST1 + 1;
167 unsigned long size, paddr, vaddr;
168
169 if (index >= m68k_realnum_memory) {
170 printk( KERN_ERR DEVICE_NAME
171 ": no such entry in z2ram_map\n" );
172 goto err_out;
173 }
174
175 paddr = m68k_memory[index].addr;
176 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
177
178#ifdef __powerpc__
179
180 {
181 vfree(vmalloc (size));
182 }
183
184 vaddr = (unsigned long) __ioremap (paddr, size,
185 _PAGE_WRITETHRU);
186
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 )
194 {
195 printk( KERN_ERR DEVICE_NAME
196 ": cannot get mem for z2ram_map\n" );
197 goto err_out;
198 }
199
200 while (size) {
201 z2ram_map[ z2ram_size++ ] = vaddr;
202 size -= Z2RAM_CHUNKSIZE;
203 vaddr += Z2RAM_CHUNKSIZE;
204 list_count++;
205 }
206
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
212
213 switch ( device )
214 {
215 case Z2MINOR_COMBINED:
216
217 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
218 if ( z2ram_map == NULL )
219 {
220 printk( KERN_ERR DEVICE_NAME
221 ": cannot get mem for z2ram_map\n" );
222 goto err_out;
223 }
224
225 get_z2ram();
226 get_chipram();
227
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 );
234
235 break;
236
237 case Z2MINOR_Z2ONLY:
238 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
239 if ( z2ram_map == NULL )
240 {
241 printk( KERN_ERR DEVICE_NAME
242 ": cannot get mem for z2ram_map\n" );
243 goto err_out;
244 }
245
246 get_z2ram();
247
248 if ( z2ram_size != 0 )
249 printk( KERN_INFO DEVICE_NAME
250 ": using %iK of Zorro II RAM\n",
251 z2_count * Z2RAM_CHUNK1024 );
252
253 break;
254
255 case Z2MINOR_CHIPONLY:
256 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
257 if ( z2ram_map == NULL )
258 {
259 printk( KERN_ERR DEVICE_NAME
260 ": cannot get mem for z2ram_map\n" );
261 goto err_out;
262 }
263
264 get_chipram();
265
266 if ( z2ram_size != 0 )
267 printk( KERN_INFO DEVICE_NAME
268 ": using %iK Chip RAM\n",
269 chip_count * Z2RAM_CHUNK1024 );
270
271 break;
272
273 default:
274 rc = -ENODEV;
275 goto err_out;
276
277 break;
278 }
279
280 if ( z2ram_size == 0 )
281 {
282 printk( KERN_NOTICE DEVICE_NAME
283 ": no unused ZII/Chip RAM found\n" );
284 goto err_out_kfree;
285 }
286
287 current_device = device;
288 z2ram_size <<= Z2RAM_CHUNKSHIFT;
289 set_capacity(z2ram_gendisk, z2ram_size >> 9);
290 }
291
292 return 0;
293
294err_out_kfree:
295 kfree(z2ram_map);
296err_out:
297 return rc;
298}
299
300static int
301z2_release(struct gendisk *disk, fmode_t mode)
302{
303 if ( current_device == -1 )
304 return 0;
305
306
307
308
309
310 return 0;
311}
312
313static struct block_device_operations z2_fops =
314{
315 .owner = THIS_MODULE,
316 .open = z2_open,
317 .release = z2_release,
318};
319
320static struct kobject *z2_find(dev_t dev, int *part, void *data)
321{
322 *part = 0;
323 return get_disk(z2ram_gendisk);
324}
325
326static struct request_queue *z2_queue;
327
328static int __init
329z2_init(void)
330{
331 int ret;
332
333 if (!MACH_IS_AMIGA)
334 return -ENODEV;
335
336 ret = -EBUSY;
337 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
338 goto err;
339
340 ret = -ENOMEM;
341 z2ram_gendisk = alloc_disk(1);
342 if (!z2ram_gendisk)
343 goto out_disk;
344
345 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
346 if (!z2_queue)
347 goto out_queue;
348
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");
353
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);
358
359 return 0;
360
361out_queue:
362 put_disk(z2ram_gendisk);
363out_disk:
364 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
365err:
366 return ret;
367}
368
369static void __exit z2_exit(void)
370{
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);
377
378 if ( current_device != -1 )
379 {
380 i = 0;
381
382 for ( j = 0 ; j < z2_count; j++ )
383 {
384 set_bit( i++, zorro_unused_z2ram );
385 }
386
387 for ( j = 0 ; j < chip_count; j++ )
388 {
389 if ( z2ram_map[ i ] )
390 {
391 amiga_chip_free( (void *) z2ram_map[ i++ ] );
392 }
393 }
394
395 if ( z2ram_map != NULL )
396 {
397 kfree( z2ram_map );
398 }
399 }
400
401 return;
402}
403
404module_init(z2_init);
405module_exit(z2_exit);
406MODULE_LICENSE("GPL");
407
