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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Arnd Bergmann2a48fc02010-06-02 14:28:52 +020036#include <linux/mutex.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090037#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#include <asm/setup.h>
40#include <asm/amigahw.h>
41#include <asm/pgtable.h>
42
43#include <linux/zorro.h>
44
45
46extern int m68k_realnum_memory;
47extern struct mem_info m68k_memory[NUM_MEMINFO];
48
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#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 */
57
58#define Z2RAM_CHUNK1024 ( Z2RAM_CHUNKSIZE >> 10 )
59
Arnd Bergmann2a48fc02010-06-02 14:28:52 +020060static DEFINE_MUTEX(z2ram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061static u_long *z2ram_map = NULL;
62static u_long z2ram_size = 0;
63static int z2_count = 0;
64static int chip_count = 0;
65static int list_count = 0;
66static int current_device = -1;
67
68static DEFINE_SPINLOCK(z2ram_lock);
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static struct gendisk *z2ram_gendisk;
71
Jens Axboe165125e2007-07-24 09:28:11 +020072static void do_z2_request(struct request_queue *q)
Linus Torvalds1da177e2005-04-16 15:20:36 -070073{
74 struct request *req;
Tejun Heofb3ac7f6b2009-05-08 11:54:13 +090075
Tejun Heo9934c8c2009-05-08 11:54:16 +090076 req = blk_fetch_request(q);
Tejun Heofb3ac7f6b2009-05-08 11:54:13 +090077 while (req) {
Tejun Heo83096eb2009-05-07 22:24:39 +090078 unsigned long start = blk_rq_pos(req) << 9;
Tejun Heo1011c1b2009-05-07 22:24:45 +090079 unsigned long len = blk_rq_cur_bytes(req);
Tejun Heofb3ac7f6b2009-05-08 11:54:13 +090080 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
82 if (start + len > z2ram_size) {
Geert Uytterhoevene1fbd922010-10-28 06:15:26 -060083 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));
Tejun Heofb3ac7f6b2009-05-08 11:54:13 +090087 err = -EIO;
88 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
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;
102 }
Tejun Heofb3ac7f6b2009-05-08 11:54:13 +0900103 done:
Tejun Heo9934c8c2009-05-08 11:54:16 +0900104 if (!__blk_end_request_cur(req, err))
105 req = blk_fetch_request(q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 }
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++ ] =
120 ZTWO_VADDR( Z2RAM_START ) + ( 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
Al Viroab746cb2008-03-02 10:24:45 -0500149static int z2_open(struct block_device *bdev, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
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
Al Viroab746cb2008-03-02 10:24:45 -0500158 device = MINOR(bdev->bd_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200160 mutex_lock(&z2ram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 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 /* 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;
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 /* FIXME: ioremap doesn't build correct memory tables. */
190 {
191 vfree(vmalloc (size));
192 }
193
194 vaddr = (unsigned long) __ioremap (paddr, size,
195 _PAGE_WRITETHRU);
196
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 )
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
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200302 mutex_unlock(&z2ram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 return 0;
304
305err_out_kfree:
Jesper Juhlf91012102005-09-10 00:26:54 -0700306 kfree(z2ram_map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307err_out:
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200308 mutex_unlock(&z2ram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 return rc;
310}
311
Al Virodb2a1442013-05-05 21:52:57 -0400312static void
Al Viroab746cb2008-03-02 10:24:45 -0500313z2_release(struct gendisk *disk, fmode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200315 mutex_lock(&z2ram_mutex);
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200316 if ( current_device == -1 ) {
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200317 mutex_unlock(&z2ram_mutex);
Al Virodb2a1442013-05-05 21:52:57 -0400318 return;
Arnd Bergmann6e9624b2010-08-07 18:25:34 +0200319 }
Arnd Bergmann2a48fc02010-06-02 14:28:52 +0200320 mutex_unlock(&z2ram_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 /*
322 * FIXME: unmap memory
323 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324}
325
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700326static const struct block_device_operations z2_fops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
328 .owner = THIS_MODULE,
Al Viroab746cb2008-03-02 10:24:45 -0500329 .open = z2_open,
330 .release = z2_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331};
332
333static struct kobject *z2_find(dev_t dev, int *part, void *data)
334{
335 *part = 0;
336 return get_disk(z2ram_gendisk);
337}
338
339static struct request_queue *z2_queue;
340
Al Virof39d88a2006-10-11 17:28:47 +0100341static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342z2_init(void)
343{
344 int ret;
345
346 if (!MACH_IS_AMIGA)
Geert Uytterhoevenfd5b4622008-05-18 20:47:18 +0200347 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349 ret = -EBUSY;
350 if (register_blkdev(Z2RAM_MAJOR, DEVICE_NAME))
351 goto err;
352
353 ret = -ENOMEM;
354 z2ram_gendisk = alloc_disk(1);
355 if (!z2ram_gendisk)
356 goto out_disk;
357
358 z2_queue = blk_init_queue(do_z2_request, &z2ram_lock);
359 if (!z2_queue)
360 goto out_queue;
361
362 z2ram_gendisk->major = Z2RAM_MAJOR;
363 z2ram_gendisk->first_minor = 0;
364 z2ram_gendisk->fops = &z2_fops;
365 sprintf(z2ram_gendisk->disk_name, "z2ram");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 z2ram_gendisk->queue = z2_queue;
368 add_disk(z2ram_gendisk);
369 blk_register_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT, THIS_MODULE,
370 z2_find, NULL, NULL);
371
372 return 0;
373
374out_queue:
375 put_disk(z2ram_gendisk);
376out_disk:
377 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
378err:
379 return ret;
380}
381
Al Virof39d88a2006-10-11 17:28:47 +0100382static void __exit z2_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 int i, j;
Zhaoleic9d4bc22009-07-14 17:59:05 +0800385 blk_unregister_region(MKDEV(Z2RAM_MAJOR, 0), Z2MINOR_COUNT);
Akinobu Mita00d59402007-07-17 04:03:46 -0700386 unregister_blkdev(Z2RAM_MAJOR, DEVICE_NAME);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 del_gendisk(z2ram_gendisk);
388 put_disk(z2ram_gendisk);
389 blk_cleanup_queue(z2_queue);
390
391 if ( current_device != -1 )
392 {
393 i = 0;
394
395 for ( j = 0 ; j < z2_count; j++ )
396 {
397 set_bit( i++, zorro_unused_z2ram );
398 }
399
400 for ( j = 0 ; j < chip_count; j++ )
401 {
402 if ( z2ram_map[ i ] )
403 {
404 amiga_chip_free( (void *) z2ram_map[ i++ ] );
405 }
406 }
407
408 if ( z2ram_map != NULL )
409 {
410 kfree( z2ram_map );
411 }
412 }
413
414 return;
415}
Al Virof39d88a2006-10-11 17:28:47 +0100416
417module_init(z2_init);
418module_exit(z2_exit);
419MODULE_LICENSE("GPL");