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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/blk-mq.h>
35#include <linux/bitops.h>
36#include <linux/mutex.h>
37#include <linux/slab.h>
38
39#include <asm/setup.h>
40#include <asm/amigahw.h>
41#include <asm/pgtable.h>
42
43#include <linux/zorro.h>
44
45
46#define Z2MINOR_COMBINED (0)
47#define Z2MINOR_Z2ONLY (1)
48#define Z2MINOR_CHIPONLY (2)
49#define Z2MINOR_MEMLIST1 (4)
50#define Z2MINOR_MEMLIST2 (5)
51#define Z2MINOR_MEMLIST3 (6)
52#define Z2MINOR_MEMLIST4 (7)
53#define Z2MINOR_COUNT (8)
54
55#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
56
57static DEFINE_MUTEX(z2ram_mutex);
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 blk_status_t z2_queue_rq(struct blk_mq_hw_ctx *hctx,
70 const struct blk_mq_queue_data *bd)
71{
72 struct request *req = bd->rq;
73 unsigned long start = blk_rq_pos(req) << 9;
74 unsigned long len = blk_rq_cur_bytes(req);
75
76 blk_mq_start_request(req);
77
78 if (start + len > z2ram_size) {
79 pr_err(DEVICE_NAME ": bad access: block=%llu, "
80 "count=%u\n",
81 (unsigned long long)blk_rq_pos(req),
82 blk_rq_cur_sectors(req));
83 return BLK_STS_IOERR;
84 }
85
86 spin_lock_irq(&z2ram_lock);
87
88 while (len) {
89 unsigned long addr = start & Z2RAM_CHUNKMASK;
90 unsigned long size = Z2RAM_CHUNKSIZE - addr;
91 void *buffer = bio_data(req->bio);
92
93 if (len < size)
94 size = len;
95 addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
96 if (rq_data_dir(req) == READ)
97 memcpy(buffer, (char *)addr, size);
98 else
99 memcpy((char *)addr, buffer, size);
100 start += size;
101 len -= size;
102 }
103
104 spin_unlock_irq(&z2ram_lock);
105 blk_mq_end_request(req, BLK_STS_OK);
106 return BLK_STS_OK;
107}
108
109static void
110get_z2ram( void )
111{
112 int i;
113
114 for ( i = 0; i < Z2RAM_SIZE / Z2RAM_CHUNKSIZE; i++ )
115 {
116 if ( test_bit( i, zorro_unused_z2ram ) )
117 {
118 z2_count++;
119 z2ram_map[z2ram_size++] = (unsigned long)ZTWO_VADDR(Z2RAM_START) +
120 (i << Z2RAM_CHUNKSHIFT);
121 clear_bit( i, zorro_unused_z2ram );
122 }
123 }
124
125 return;
126}
127
128static void
129get_chipram( void )
130{
131
132 while ( amiga_chip_avail() > ( Z2RAM_CHUNKSIZE * 4 ) )
133 {
134 chip_count++;
135 z2ram_map[ z2ram_size ] =
136 (u_long)amiga_chip_alloc( Z2RAM_CHUNKSIZE, "z2ram" );
137
138 if ( z2ram_map[ z2ram_size ] == 0 )
139 {
140 break;
141 }
142
143 z2ram_size++;
144 }
145
146 return;
147}
148
149static int z2_open(struct block_device *bdev, fmode_t mode)
150{
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;
157
158 device = MINOR(bdev->bd_dev);
159
160 mutex_lock(&z2ram_mutex);
161 if ( current_device != -1 && current_device != device )
162 {
163 rc = -EBUSY;
164 goto err_out;
165 }
166
167 if ( current_device == -1 )
168 {
169 z2_count = 0;
170 chip_count = 0;
171 list_count = 0;
172 z2ram_size = 0;
173
174
175 if (device >= Z2MINOR_MEMLIST1 && device <= Z2MINOR_MEMLIST4) {
176 int index = device - Z2MINOR_MEMLIST1 + 1;
177 unsigned long size, paddr, vaddr;
178
179 if (index >= m68k_realnum_memory) {
180 printk( KERN_ERR DEVICE_NAME
181 ": no such entry in z2ram_map\n" );
182 goto err_out;
183 }
184
185 paddr = m68k_memory[index].addr;
186 size = m68k_memory[index].size & ~(Z2RAM_CHUNKSIZE-1);
187
188#ifdef __powerpc__
189
190 {
191 vfree(vmalloc (size));
192 }
193
194 vaddr = (unsigned long)ioremap_wt(paddr, size);
195
196#else
197 vaddr = (unsigned long)z_remap_nocache_nonser(paddr, size);
198#endif
199 z2ram_map =
200 kmalloc_array(size / Z2RAM_CHUNKSIZE,
201 sizeof(z2ram_map[0]),
202 GFP_KERNEL);
203 if ( z2ram_map == NULL )
204 {
205 printk( KERN_ERR DEVICE_NAME
206 ": cannot get mem for z2ram_map\n" );
207 goto err_out;
208 }
209
210 while (size) {
211 z2ram_map[ z2ram_size++ ] = vaddr;
212 size -= Z2RAM_CHUNKSIZE;
213 vaddr += Z2RAM_CHUNKSIZE;
214 list_count++;
215 }
216
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
222
223 switch ( device )
224 {
225 case Z2MINOR_COMBINED:
226
227 z2ram_map = kmalloc( max_z2_map + max_chip_map, GFP_KERNEL );
228 if ( z2ram_map == NULL )
229 {
230 printk( KERN_ERR DEVICE_NAME
231 ": cannot get mem for z2ram_map\n" );
232 goto err_out;
233 }
234
235 get_z2ram();
236 get_chipram();
237
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 );
244
245 break;
246
247 case Z2MINOR_Z2ONLY:
248 z2ram_map = kmalloc( max_z2_map, GFP_KERNEL );
249 if ( z2ram_map == NULL )
250 {
251 printk( KERN_ERR DEVICE_NAME
252 ": cannot get mem for z2ram_map\n" );
253 goto err_out;
254 }
255
256 get_z2ram();
257
258 if ( z2ram_size != 0 )
259 printk( KERN_INFO DEVICE_NAME
260 ": using %iK of Zorro II RAM\n",
261 z2_count * Z2RAM_CHUNK1024 );
262
263 break;
264
265 case Z2MINOR_CHIPONLY:
266 z2ram_map = kmalloc( max_chip_map, GFP_KERNEL );
267 if ( z2ram_map == NULL )
268 {
269 printk( KERN_ERR DEVICE_NAME
270 ": cannot get mem for z2ram_map\n" );
271 goto err_out;
272 }
273
274 get_chipram();
275
276 if ( z2ram_size != 0 )
277 printk( KERN_INFO DEVICE_NAME
278 ": using %iK Chip RAM\n",
279 chip_count * Z2RAM_CHUNK1024 );
280
281 break;
282
283 default:
284 rc = -ENODEV;
285 goto err_out;
286
287 break;
288 }
289
290 if ( z2ram_size == 0 )
291 {
292 printk( KERN_NOTICE DEVICE_NAME
293 ": no unused ZII/Chip RAM found\n" );
294 goto err_out_kfree;
295 }
296
297 current_device = device;
298 z2ram_size <<= Z2RAM_CHUNKSHIFT;
299 set_capacity(z2ram_gendisk, z2ram_size >> 9);
300 }
301
302 mutex_unlock(&z2ram_mutex);
303 return 0;
304
305err_out_kfree:
306 kfree(z2ram_map);
307err_out:
308 mutex_unlock(&z2ram_mutex);
309 return rc;
310}
311
312static void
313z2_release(struct gendisk *disk, fmode_t mode)
314{
315 mutex_lock(&z2ram_mutex);
316 if ( current_device == -1 ) {
317 mutex_unlock(&z2ram_mutex);
318 return;
319 }
320 mutex_unlock(&z2ram_mutex);
321
322
323
324}
325
326static const struct block_device_operations z2_fops =
327{
328 .owner = THIS_MODULE,
329 .open = z2_open,
330 .release = z2_release,
331};
332
333static struct kobject *z2_find(dev_t dev, int *part, void *data)
334{
335 *part = 0;
336 return get_disk_and_module(z2ram_gendisk);
337}
338
339static struct request_queue *z2_queue;
340static struct blk_mq_tag_set tag_set;
341
342static const struct blk_mq_ops z2_mq_ops = {
343 .queue_rq = z2_queue_rq,
344};
345
346static int __init
347z2_init(void)
348{
349 int ret;
350
351 if (!MACH_IS_AMIGA)
352 return -ENODEV;
353
354 ret = -EBUSY;
355 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
356 goto err;
357
358 ret = -ENOMEM;
359 z2ram_gendisk = alloc_disk(1);
360 if (!z2ram_gendisk)
361 goto out_disk;
362
363 z2_queue = blk_mq_init_sq_queue(&tag_set, &z2_mq_ops, 16,
364 BLK_MQ_F_SHOULD_MERGE);
365 if (IS_ERR(z2_queue)) {
366 ret = PTR_ERR(z2_queue);
367 z2_queue = NULL;
368 goto out_queue;
369 }
370
371 z2ram_gendisk->major = Z2RAM_MAJOR;
372 z2ram_gendisk->first_minor = 0;
373 z2ram_gendisk->fops = &z2_fops;
374 sprintf(z2ram_gendisk->disk_name, "z2ram");
375
376 z2ram_gendisk->queue = z2_queue;
377 add_disk(z2ram_gendisk);
378 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
379 z2_find, NULL, NULL);
380
381 return 0;
382
383out_queue:
384 put_disk(z2ram_gendisk);
385out_disk:
386 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
387err:
388 return ret;
389}
390
391static void __exit z2_exit(void)
392{
393 int i, j;
394 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
395 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
396 del_gendisk(z2ram_gendisk);
397 put_disk(z2ram_gendisk);
398 blk_cleanup_queue(z2_queue);
399 blk_mq_free_tag_set(&tag_set);
400
401 if ( current_device != -1 )
402 {
403 i = 0;
404
405 for ( j = 0 ; j < z2_count; j++ )
406 {
407 set_bit( i++, zorro_unused_z2ram );
408 }
409
410 for ( j = 0 ; j < chip_count; j++ )
411 {
412 if ( z2ram_map[ i ] )
413 {
414 amiga_chip_free( (void *) z2ram_map[ i++ ] );
415 }
416 }
417
418 if ( z2ram_map != NULL )
419 {
420 kfree( z2ram_map );
421 }
422 }
423
424 return;
425}
426
427module_init(z2_init);
428module_exit(z2_exit);
429MODULE_LICENSE("GPL");
430
