Commit | Line | Data |
---|---|---|
97894cda | 1 | /* |
1da177e4 LT |
2 | * inftlcore.c -- Linux driver for Inverse Flash Translation Layer (INFTL) |
3 | * | |
4 | * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) | |
5 | * | |
6 | * Based heavily on the nftlcore.c code which is: | |
7 | * (c) 1999 Machine Vision Holdings, Inc. | |
8 | * Author: David Woodhouse <dwmw2@infradead.org> | |
9 | * | |
1da177e4 LT |
10 | * This program is free software; you can redistribute it and/or modify |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
1da177e4 LT |
25 | #include <linux/kernel.h> |
26 | #include <linux/module.h> | |
27 | #include <linux/delay.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/kmod.h> | |
32 | #include <linux/hdreg.h> | |
33 | #include <linux/mtd/mtd.h> | |
34 | #include <linux/mtd/nftl.h> | |
35 | #include <linux/mtd/inftl.h> | |
9223a456 | 36 | #include <linux/mtd/nand.h> |
1da177e4 LT |
37 | #include <asm/uaccess.h> |
38 | #include <asm/errno.h> | |
39 | #include <asm/io.h> | |
40 | ||
41 | /* | |
42 | * Maximum number of loops while examining next block, to have a | |
43 | * chance to detect consistency problems (they should never happen | |
44 | * because of the checks done in the mounting. | |
45 | */ | |
46 | #define MAX_LOOPS 10000 | |
47 | ||
1da177e4 LT |
48 | static void inftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) |
49 | { | |
50 | struct INFTLrecord *inftl; | |
51 | unsigned long temp; | |
52 | ||
69423d99 | 53 | if (mtd->type != MTD_NANDFLASH || mtd->size > UINT_MAX) |
1da177e4 LT |
54 | return; |
55 | /* OK, this is moderately ugly. But probably safe. Alternatives? */ | |
56 | if (memcmp(mtd->name, "DiskOnChip", 10)) | |
57 | return; | |
58 | ||
59 | if (!mtd->block_isbad) { | |
60 | printk(KERN_ERR | |
61 | "INFTL no longer supports the old DiskOnChip drivers loaded via docprobe.\n" | |
62 | "Please use the new diskonchip driver under the NAND subsystem.\n"); | |
63 | return; | |
64 | } | |
65 | ||
66 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: add_mtd for %s\n", mtd->name); | |
67 | ||
95b93a0c | 68 | inftl = kzalloc(sizeof(*inftl), GFP_KERNEL); |
1da177e4 LT |
69 | |
70 | if (!inftl) { | |
71 | printk(KERN_WARNING "INFTL: Out of memory for data structures\n"); | |
72 | return; | |
73 | } | |
1da177e4 LT |
74 | |
75 | inftl->mbd.mtd = mtd; | |
76 | inftl->mbd.devnum = -1; | |
19187672 | 77 | |
1da177e4 | 78 | inftl->mbd.tr = tr; |
1da177e4 | 79 | |
9223a456 | 80 | if (INFTL_mount(inftl) < 0) { |
1da177e4 LT |
81 | printk(KERN_WARNING "INFTL: could not mount device\n"); |
82 | kfree(inftl); | |
83 | return; | |
9223a456 | 84 | } |
1da177e4 LT |
85 | |
86 | /* OK, it's a new one. Set up all the data structures. */ | |
87 | ||
88 | /* Calculate geometry */ | |
89 | inftl->cylinders = 1024; | |
90 | inftl->heads = 16; | |
91 | ||
92 | temp = inftl->cylinders * inftl->heads; | |
93 | inftl->sectors = inftl->mbd.size / temp; | |
94 | if (inftl->mbd.size % temp) { | |
95 | inftl->sectors++; | |
96 | temp = inftl->cylinders * inftl->sectors; | |
97 | inftl->heads = inftl->mbd.size / temp; | |
98 | ||
99 | if (inftl->mbd.size % temp) { | |
100 | inftl->heads++; | |
101 | temp = inftl->heads * inftl->sectors; | |
102 | inftl->cylinders = inftl->mbd.size / temp; | |
103 | } | |
104 | } | |
105 | ||
106 | if (inftl->mbd.size != inftl->heads * inftl->cylinders * inftl->sectors) { | |
107 | /* | |
97894cda | 108 | Oh no we don't have |
1da177e4 LT |
109 | mbd.size == heads * cylinders * sectors |
110 | */ | |
111 | printk(KERN_WARNING "INFTL: cannot calculate a geometry to " | |
112 | "match size of 0x%lx.\n", inftl->mbd.size); | |
113 | printk(KERN_WARNING "INFTL: using C:%d H:%d S:%d " | |
114 | "(== 0x%lx sects)\n", | |
97894cda | 115 | inftl->cylinders, inftl->heads , inftl->sectors, |
1da177e4 LT |
116 | (long)inftl->cylinders * (long)inftl->heads * |
117 | (long)inftl->sectors ); | |
118 | } | |
119 | ||
120 | if (add_mtd_blktrans_dev(&inftl->mbd)) { | |
fa671646 JJ |
121 | kfree(inftl->PUtable); |
122 | kfree(inftl->VUtable); | |
1da177e4 LT |
123 | kfree(inftl); |
124 | return; | |
125 | } | |
126 | #ifdef PSYCHO_DEBUG | |
8b68a126 | 127 | printk(KERN_INFO "INFTL: Found new inftl%c\n", inftl->mbd.devnum + 'a'); |
1da177e4 LT |
128 | #endif |
129 | return; | |
130 | } | |
131 | ||
132 | static void inftl_remove_dev(struct mtd_blktrans_dev *dev) | |
133 | { | |
134 | struct INFTLrecord *inftl = (void *)dev; | |
135 | ||
136 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: remove_dev (i=%d)\n", dev->devnum); | |
137 | ||
138 | del_mtd_blktrans_dev(dev); | |
139 | ||
fa671646 JJ |
140 | kfree(inftl->PUtable); |
141 | kfree(inftl->VUtable); | |
1da177e4 LT |
142 | kfree(inftl); |
143 | } | |
144 | ||
145 | /* | |
146 | * Actual INFTL access routines. | |
147 | */ | |
148 | ||
8593fbc6 TG |
149 | /* |
150 | * Read oob data from flash | |
151 | */ | |
152 | int inftl_read_oob(struct mtd_info *mtd, loff_t offs, size_t len, | |
153 | size_t *retlen, uint8_t *buf) | |
154 | { | |
155 | struct mtd_oob_ops ops; | |
156 | int res; | |
157 | ||
158 | ops.mode = MTD_OOB_PLACE; | |
159 | ops.ooboffs = offs & (mtd->writesize - 1); | |
160 | ops.ooblen = len; | |
161 | ops.oobbuf = buf; | |
162 | ops.datbuf = NULL; | |
8593fbc6 TG |
163 | |
164 | res = mtd->read_oob(mtd, offs & ~(mtd->writesize - 1), &ops); | |
7014568b | 165 | *retlen = ops.oobretlen; |
8593fbc6 TG |
166 | return res; |
167 | } | |
168 | ||
169 | /* | |
170 | * Write oob data to flash | |
171 | */ | |
172 | int inftl_write_oob(struct mtd_info *mtd, loff_t offs, size_t len, | |
173 | size_t *retlen, uint8_t *buf) | |
174 | { | |
175 | struct mtd_oob_ops ops; | |
176 | int res; | |
177 | ||
178 | ops.mode = MTD_OOB_PLACE; | |
179 | ops.ooboffs = offs & (mtd->writesize - 1); | |
180 | ops.ooblen = len; | |
181 | ops.oobbuf = buf; | |
182 | ops.datbuf = NULL; | |
8593fbc6 TG |
183 | |
184 | res = mtd->write_oob(mtd, offs & ~(mtd->writesize - 1), &ops); | |
7014568b | 185 | *retlen = ops.oobretlen; |
8593fbc6 TG |
186 | return res; |
187 | } | |
188 | ||
189 | /* | |
190 | * Write data and oob to flash | |
191 | */ | |
192 | static int inftl_write(struct mtd_info *mtd, loff_t offs, size_t len, | |
193 | size_t *retlen, uint8_t *buf, uint8_t *oob) | |
194 | { | |
195 | struct mtd_oob_ops ops; | |
196 | int res; | |
197 | ||
198 | ops.mode = MTD_OOB_PLACE; | |
199 | ops.ooboffs = offs; | |
200 | ops.ooblen = mtd->oobsize; | |
201 | ops.oobbuf = oob; | |
202 | ops.datbuf = buf; | |
203 | ops.len = len; | |
204 | ||
205 | res = mtd->write_oob(mtd, offs & ~(mtd->writesize - 1), &ops); | |
206 | *retlen = ops.retlen; | |
207 | return res; | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /* |
211 | * INFTL_findfreeblock: Find a free Erase Unit on the INFTL partition. | |
212 | * This function is used when the give Virtual Unit Chain. | |
213 | */ | |
214 | static u16 INFTL_findfreeblock(struct INFTLrecord *inftl, int desperate) | |
215 | { | |
216 | u16 pot = inftl->LastFreeEUN; | |
217 | int silly = inftl->nb_blocks; | |
218 | ||
219 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_findfreeblock(inftl=%p," | |
220 | "desperate=%d)\n", inftl, desperate); | |
221 | ||
222 | /* | |
223 | * Normally, we force a fold to happen before we run out of free | |
224 | * blocks completely. | |
225 | */ | |
226 | if (!desperate && inftl->numfreeEUNs < 2) { | |
227 | DEBUG(MTD_DEBUG_LEVEL1, "INFTL: there are too few free " | |
228 | "EUNs (%d)\n", inftl->numfreeEUNs); | |
70ec3bb8 | 229 | return BLOCK_NIL; |
1da177e4 LT |
230 | } |
231 | ||
232 | /* Scan for a free block */ | |
233 | do { | |
234 | if (inftl->PUtable[pot] == BLOCK_FREE) { | |
235 | inftl->LastFreeEUN = pot; | |
236 | return pot; | |
237 | } | |
238 | ||
239 | if (++pot > inftl->lastEUN) | |
240 | pot = 0; | |
241 | ||
242 | if (!silly--) { | |
243 | printk(KERN_WARNING "INFTL: no free blocks found! " | |
244 | "EUN range = %d - %d\n", 0, inftl->LastFreeEUN); | |
245 | return BLOCK_NIL; | |
246 | } | |
247 | } while (pot != inftl->LastFreeEUN); | |
248 | ||
249 | return BLOCK_NIL; | |
250 | } | |
251 | ||
252 | static u16 INFTL_foldchain(struct INFTLrecord *inftl, unsigned thisVUC, unsigned pendingblock) | |
253 | { | |
254 | u16 BlockMap[MAX_SECTORS_PER_UNIT]; | |
255 | unsigned char BlockDeleted[MAX_SECTORS_PER_UNIT]; | |
256 | unsigned int thisEUN, prevEUN, status; | |
f4a43cfc | 257 | struct mtd_info *mtd = inftl->mbd.mtd; |
1da177e4 LT |
258 | int block, silly; |
259 | unsigned int targetEUN; | |
260 | struct inftl_oob oob; | |
f4a43cfc | 261 | size_t retlen; |
1da177e4 LT |
262 | |
263 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_foldchain(inftl=%p,thisVUC=%d," | |
264 | "pending=%d)\n", inftl, thisVUC, pendingblock); | |
265 | ||
266 | memset(BlockMap, 0xff, sizeof(BlockMap)); | |
267 | memset(BlockDeleted, 0, sizeof(BlockDeleted)); | |
268 | ||
269 | thisEUN = targetEUN = inftl->VUtable[thisVUC]; | |
270 | ||
271 | if (thisEUN == BLOCK_NIL) { | |
272 | printk(KERN_WARNING "INFTL: trying to fold non-existent " | |
273 | "Virtual Unit Chain %d!\n", thisVUC); | |
274 | return BLOCK_NIL; | |
275 | } | |
97894cda | 276 | |
1da177e4 LT |
277 | /* |
278 | * Scan to find the Erase Unit which holds the actual data for each | |
279 | * 512-byte block within the Chain. | |
280 | */ | |
9223a456 | 281 | silly = MAX_LOOPS; |
1da177e4 LT |
282 | while (thisEUN < inftl->nb_blocks) { |
283 | for (block = 0; block < inftl->EraseSize/SECTORSIZE; block ++) { | |
70ec3bb8 JL |
284 | if ((BlockMap[block] != BLOCK_NIL) || |
285 | BlockDeleted[block]) | |
1da177e4 LT |
286 | continue; |
287 | ||
8593fbc6 TG |
288 | if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) |
289 | + (block * SECTORSIZE), 16, &retlen, | |
290 | (char *)&oob) < 0) | |
1da177e4 LT |
291 | status = SECTOR_IGNORE; |
292 | else | |
9223a456 | 293 | status = oob.b.Status | oob.b.Status1; |
1da177e4 LT |
294 | |
295 | switch(status) { | |
296 | case SECTOR_FREE: | |
297 | case SECTOR_IGNORE: | |
298 | break; | |
299 | case SECTOR_USED: | |
300 | BlockMap[block] = thisEUN; | |
301 | continue; | |
302 | case SECTOR_DELETED: | |
303 | BlockDeleted[block] = 1; | |
304 | continue; | |
305 | default: | |
306 | printk(KERN_WARNING "INFTL: unknown status " | |
307 | "for block %d in EUN %d: %x\n", | |
308 | block, thisEUN, status); | |
309 | break; | |
310 | } | |
311 | } | |
312 | ||
313 | if (!silly--) { | |
314 | printk(KERN_WARNING "INFTL: infinite loop in Virtual " | |
315 | "Unit Chain 0x%x\n", thisVUC); | |
316 | return BLOCK_NIL; | |
317 | } | |
97894cda | 318 | |
1da177e4 LT |
319 | thisEUN = inftl->PUtable[thisEUN]; |
320 | } | |
321 | ||
322 | /* | |
323 | * OK. We now know the location of every block in the Virtual Unit | |
324 | * Chain, and the Erase Unit into which we are supposed to be copying. | |
325 | * Go for it. | |
326 | */ | |
327 | DEBUG(MTD_DEBUG_LEVEL1, "INFTL: folding chain %d into unit %d\n", | |
328 | thisVUC, targetEUN); | |
329 | ||
330 | for (block = 0; block < inftl->EraseSize/SECTORSIZE ; block++) { | |
331 | unsigned char movebuf[SECTORSIZE]; | |
332 | int ret; | |
333 | ||
334 | /* | |
335 | * If it's in the target EUN already, or if it's pending write, | |
336 | * do nothing. | |
337 | */ | |
338 | if (BlockMap[block] == targetEUN || (pendingblock == | |
339 | (thisVUC * (inftl->EraseSize / SECTORSIZE) + block))) { | |
340 | continue; | |
341 | } | |
342 | ||
9223a456 | 343 | /* |
1da177e4 LT |
344 | * Copy only in non free block (free blocks can only |
345 | * happen in case of media errors or deleted blocks). | |
346 | */ | |
9223a456 TG |
347 | if (BlockMap[block] == BLOCK_NIL) |
348 | continue; | |
97894cda | 349 | |
f4a43cfc TG |
350 | ret = mtd->read(mtd, (inftl->EraseSize * BlockMap[block]) + |
351 | (block * SECTORSIZE), SECTORSIZE, &retlen, | |
352 | movebuf); | |
9a1fcdfd | 353 | if (ret < 0 && ret != -EUCLEAN) { |
f4a43cfc TG |
354 | ret = mtd->read(mtd, |
355 | (inftl->EraseSize * BlockMap[block]) + | |
356 | (block * SECTORSIZE), SECTORSIZE, | |
357 | &retlen, movebuf); | |
97894cda | 358 | if (ret != -EIO) |
9223a456 TG |
359 | DEBUG(MTD_DEBUG_LEVEL1, "INFTL: error went " |
360 | "away on retry?\n"); | |
361 | } | |
362 | memset(&oob, 0xff, sizeof(struct inftl_oob)); | |
363 | oob.b.Status = oob.b.Status1 = SECTOR_USED; | |
364 | ||
8593fbc6 TG |
365 | inftl_write(inftl->mbd.mtd, (inftl->EraseSize * targetEUN) + |
366 | (block * SECTORSIZE), SECTORSIZE, &retlen, | |
367 | movebuf, (char *)&oob); | |
1da177e4 LT |
368 | } |
369 | ||
370 | /* | |
371 | * Newest unit in chain now contains data from _all_ older units. | |
372 | * So go through and erase each unit in chain, oldest first. (This | |
373 | * is important, by doing oldest first if we crash/reboot then it | |
374 | * it is relatively simple to clean up the mess). | |
375 | */ | |
376 | DEBUG(MTD_DEBUG_LEVEL1, "INFTL: want to erase virtual chain %d\n", | |
377 | thisVUC); | |
378 | ||
379 | for (;;) { | |
380 | /* Find oldest unit in chain. */ | |
381 | thisEUN = inftl->VUtable[thisVUC]; | |
382 | prevEUN = BLOCK_NIL; | |
383 | while (inftl->PUtable[thisEUN] != BLOCK_NIL) { | |
384 | prevEUN = thisEUN; | |
385 | thisEUN = inftl->PUtable[thisEUN]; | |
386 | } | |
387 | ||
388 | /* Check if we are all done */ | |
389 | if (thisEUN == targetEUN) | |
390 | break; | |
391 | ||
63fd7f30 DR |
392 | /* Unlink the last block from the chain. */ |
393 | inftl->PUtable[prevEUN] = BLOCK_NIL; | |
394 | ||
395 | /* Now try to erase it. */ | |
9223a456 | 396 | if (INFTL_formatblock(inftl, thisEUN) < 0) { |
1da177e4 LT |
397 | /* |
398 | * Could not erase : mark block as reserved. | |
399 | */ | |
400 | inftl->PUtable[thisEUN] = BLOCK_RESERVED; | |
9223a456 | 401 | } else { |
1da177e4 LT |
402 | /* Correctly erased : mark it as free */ |
403 | inftl->PUtable[thisEUN] = BLOCK_FREE; | |
1da177e4 | 404 | inftl->numfreeEUNs++; |
9223a456 | 405 | } |
1da177e4 LT |
406 | } |
407 | ||
408 | return targetEUN; | |
409 | } | |
410 | ||
411 | static u16 INFTL_makefreeblock(struct INFTLrecord *inftl, unsigned pendingblock) | |
412 | { | |
413 | /* | |
97894cda | 414 | * This is the part that needs some cleverness applied. |
1da177e4 LT |
415 | * For now, I'm doing the minimum applicable to actually |
416 | * get the thing to work. | |
417 | * Wear-levelling and other clever stuff needs to be implemented | |
418 | * and we also need to do some assessment of the results when | |
419 | * the system loses power half-way through the routine. | |
420 | */ | |
421 | u16 LongestChain = 0; | |
422 | u16 ChainLength = 0, thislen; | |
423 | u16 chain, EUN; | |
424 | ||
425 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_makefreeblock(inftl=%p," | |
426 | "pending=%d)\n", inftl, pendingblock); | |
427 | ||
428 | for (chain = 0; chain < inftl->nb_blocks; chain++) { | |
429 | EUN = inftl->VUtable[chain]; | |
430 | thislen = 0; | |
431 | ||
432 | while (EUN <= inftl->lastEUN) { | |
433 | thislen++; | |
434 | EUN = inftl->PUtable[EUN]; | |
435 | if (thislen > 0xff00) { | |
436 | printk(KERN_WARNING "INFTL: endless loop in " | |
437 | "Virtual Chain %d: Unit %x\n", | |
438 | chain, EUN); | |
439 | /* | |
440 | * Actually, don't return failure. | |
441 | * Just ignore this chain and get on with it. | |
442 | */ | |
443 | thislen = 0; | |
444 | break; | |
445 | } | |
446 | } | |
447 | ||
448 | if (thislen > ChainLength) { | |
449 | ChainLength = thislen; | |
450 | LongestChain = chain; | |
451 | } | |
452 | } | |
453 | ||
454 | if (ChainLength < 2) { | |
455 | printk(KERN_WARNING "INFTL: no Virtual Unit Chains available " | |
456 | "for folding. Failing request\n"); | |
457 | return BLOCK_NIL; | |
458 | } | |
459 | ||
460 | return INFTL_foldchain(inftl, LongestChain, pendingblock); | |
461 | } | |
462 | ||
463 | static int nrbits(unsigned int val, int bitcount) | |
464 | { | |
465 | int i, total = 0; | |
466 | ||
467 | for (i = 0; (i < bitcount); i++) | |
468 | total += (((0x1 << i) & val) ? 1 : 0); | |
469 | return total; | |
470 | } | |
471 | ||
472 | /* | |
97894cda | 473 | * INFTL_findwriteunit: Return the unit number into which we can write |
1da177e4 LT |
474 | * for this block. Make it available if it isn't already. |
475 | */ | |
476 | static inline u16 INFTL_findwriteunit(struct INFTLrecord *inftl, unsigned block) | |
477 | { | |
478 | unsigned int thisVUC = block / (inftl->EraseSize / SECTORSIZE); | |
479 | unsigned int thisEUN, writeEUN, prev_block, status; | |
480 | unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize -1); | |
f4a43cfc | 481 | struct mtd_info *mtd = inftl->mbd.mtd; |
1da177e4 LT |
482 | struct inftl_oob oob; |
483 | struct inftl_bci bci; | |
484 | unsigned char anac, nacs, parity; | |
485 | size_t retlen; | |
486 | int silly, silly2 = 3; | |
487 | ||
488 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_findwriteunit(inftl=%p," | |
489 | "block=%d)\n", inftl, block); | |
490 | ||
491 | do { | |
492 | /* | |
493 | * Scan the media to find a unit in the VUC which has | |
494 | * a free space for the block in question. | |
495 | */ | |
496 | writeEUN = BLOCK_NIL; | |
497 | thisEUN = inftl->VUtable[thisVUC]; | |
498 | silly = MAX_LOOPS; | |
499 | ||
500 | while (thisEUN <= inftl->lastEUN) { | |
8593fbc6 TG |
501 | inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + |
502 | blockofs, 8, &retlen, (char *)&bci); | |
1da177e4 | 503 | |
9223a456 | 504 | status = bci.Status | bci.Status1; |
1da177e4 LT |
505 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: status of block %d in " |
506 | "EUN %d is %x\n", block , writeEUN, status); | |
507 | ||
508 | switch(status) { | |
509 | case SECTOR_FREE: | |
510 | writeEUN = thisEUN; | |
511 | break; | |
512 | case SECTOR_DELETED: | |
513 | case SECTOR_USED: | |
514 | /* Can't go any further */ | |
515 | goto hitused; | |
516 | case SECTOR_IGNORE: | |
517 | break; | |
518 | default: | |
519 | /* | |
520 | * Invalid block. Don't use it any more. | |
521 | * Must implement. | |
522 | */ | |
97894cda | 523 | break; |
1da177e4 | 524 | } |
97894cda TG |
525 | |
526 | if (!silly--) { | |
1da177e4 LT |
527 | printk(KERN_WARNING "INFTL: infinite loop in " |
528 | "Virtual Unit Chain 0x%x\n", thisVUC); | |
70ec3bb8 | 529 | return BLOCK_NIL; |
1da177e4 LT |
530 | } |
531 | ||
532 | /* Skip to next block in chain */ | |
533 | thisEUN = inftl->PUtable[thisEUN]; | |
534 | } | |
535 | ||
536 | hitused: | |
537 | if (writeEUN != BLOCK_NIL) | |
538 | return writeEUN; | |
539 | ||
540 | ||
541 | /* | |
97894cda | 542 | * OK. We didn't find one in the existing chain, or there |
1da177e4 LT |
543 | * is no existing chain. Allocate a new one. |
544 | */ | |
545 | writeEUN = INFTL_findfreeblock(inftl, 0); | |
546 | ||
547 | if (writeEUN == BLOCK_NIL) { | |
548 | /* | |
549 | * That didn't work - there were no free blocks just | |
550 | * waiting to be picked up. We're going to have to fold | |
551 | * a chain to make room. | |
552 | */ | |
6ad08ddd | 553 | thisEUN = INFTL_makefreeblock(inftl, block); |
1da177e4 LT |
554 | |
555 | /* | |
556 | * Hopefully we free something, lets try again. | |
557 | * This time we are desperate... | |
558 | */ | |
559 | DEBUG(MTD_DEBUG_LEVEL1, "INFTL: using desperate==1 " | |
560 | "to find free EUN to accommodate write to " | |
561 | "VUC %d\n", thisVUC); | |
562 | writeEUN = INFTL_findfreeblock(inftl, 1); | |
563 | if (writeEUN == BLOCK_NIL) { | |
564 | /* | |
565 | * Ouch. This should never happen - we should | |
97894cda TG |
566 | * always be able to make some room somehow. |
567 | * If we get here, we've allocated more storage | |
1da177e4 LT |
568 | * space than actual media, or our makefreeblock |
569 | * routine is missing something. | |
570 | */ | |
571 | printk(KERN_WARNING "INFTL: cannot make free " | |
572 | "space.\n"); | |
573 | #ifdef DEBUG | |
574 | INFTL_dumptables(inftl); | |
575 | INFTL_dumpVUchains(inftl); | |
576 | #endif | |
577 | return BLOCK_NIL; | |
97894cda | 578 | } |
1da177e4 LT |
579 | } |
580 | ||
581 | /* | |
582 | * Insert new block into virtual chain. Firstly update the | |
583 | * block headers in flash... | |
584 | */ | |
585 | anac = 0; | |
586 | nacs = 0; | |
587 | thisEUN = inftl->VUtable[thisVUC]; | |
588 | if (thisEUN != BLOCK_NIL) { | |
8593fbc6 TG |
589 | inftl_read_oob(mtd, thisEUN * inftl->EraseSize |
590 | + 8, 8, &retlen, (char *)&oob.u); | |
1da177e4 LT |
591 | anac = oob.u.a.ANAC + 1; |
592 | nacs = oob.u.a.NACs + 1; | |
593 | } | |
594 | ||
595 | prev_block = inftl->VUtable[thisVUC]; | |
596 | if (prev_block < inftl->nb_blocks) | |
597 | prev_block -= inftl->firstEUN; | |
598 | ||
599 | parity = (nrbits(thisVUC, 16) & 0x1) ? 0x1 : 0; | |
600 | parity |= (nrbits(prev_block, 16) & 0x1) ? 0x2 : 0; | |
601 | parity |= (nrbits(anac, 8) & 0x1) ? 0x4 : 0; | |
602 | parity |= (nrbits(nacs, 8) & 0x1) ? 0x8 : 0; | |
97894cda | 603 | |
1da177e4 LT |
604 | oob.u.a.virtualUnitNo = cpu_to_le16(thisVUC); |
605 | oob.u.a.prevUnitNo = cpu_to_le16(prev_block); | |
606 | oob.u.a.ANAC = anac; | |
607 | oob.u.a.NACs = nacs; | |
608 | oob.u.a.parityPerField = parity; | |
609 | oob.u.a.discarded = 0xaa; | |
610 | ||
8593fbc6 TG |
611 | inftl_write_oob(mtd, writeEUN * inftl->EraseSize + 8, 8, |
612 | &retlen, (char *)&oob.u); | |
1da177e4 LT |
613 | |
614 | /* Also back up header... */ | |
615 | oob.u.b.virtualUnitNo = cpu_to_le16(thisVUC); | |
616 | oob.u.b.prevUnitNo = cpu_to_le16(prev_block); | |
617 | oob.u.b.ANAC = anac; | |
618 | oob.u.b.NACs = nacs; | |
619 | oob.u.b.parityPerField = parity; | |
620 | oob.u.b.discarded = 0xaa; | |
621 | ||
8593fbc6 TG |
622 | inftl_write_oob(mtd, writeEUN * inftl->EraseSize + |
623 | SECTORSIZE * 4 + 8, 8, &retlen, (char *)&oob.u); | |
1da177e4 LT |
624 | |
625 | inftl->PUtable[writeEUN] = inftl->VUtable[thisVUC]; | |
626 | inftl->VUtable[thisVUC] = writeEUN; | |
627 | ||
628 | inftl->numfreeEUNs--; | |
629 | return writeEUN; | |
630 | ||
631 | } while (silly2--); | |
632 | ||
633 | printk(KERN_WARNING "INFTL: error folding to make room for Virtual " | |
634 | "Unit Chain 0x%x\n", thisVUC); | |
70ec3bb8 | 635 | return BLOCK_NIL; |
1da177e4 LT |
636 | } |
637 | ||
638 | /* | |
639 | * Given a Virtual Unit Chain, see if it can be deleted, and if so do it. | |
640 | */ | |
641 | static void INFTL_trydeletechain(struct INFTLrecord *inftl, unsigned thisVUC) | |
642 | { | |
f4a43cfc | 643 | struct mtd_info *mtd = inftl->mbd.mtd; |
1da177e4 LT |
644 | unsigned char BlockUsed[MAX_SECTORS_PER_UNIT]; |
645 | unsigned char BlockDeleted[MAX_SECTORS_PER_UNIT]; | |
646 | unsigned int thisEUN, status; | |
647 | int block, silly; | |
648 | struct inftl_bci bci; | |
649 | size_t retlen; | |
650 | ||
651 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_trydeletechain(inftl=%p," | |
652 | "thisVUC=%d)\n", inftl, thisVUC); | |
653 | ||
654 | memset(BlockUsed, 0, sizeof(BlockUsed)); | |
655 | memset(BlockDeleted, 0, sizeof(BlockDeleted)); | |
656 | ||
657 | thisEUN = inftl->VUtable[thisVUC]; | |
658 | if (thisEUN == BLOCK_NIL) { | |
659 | printk(KERN_WARNING "INFTL: trying to delete non-existent " | |
660 | "Virtual Unit Chain %d!\n", thisVUC); | |
661 | return; | |
662 | } | |
97894cda | 663 | |
1da177e4 LT |
664 | /* |
665 | * Scan through the Erase Units to determine whether any data is in | |
666 | * each of the 512-byte blocks within the Chain. | |
667 | */ | |
668 | silly = MAX_LOOPS; | |
669 | while (thisEUN < inftl->nb_blocks) { | |
670 | for (block = 0; block < inftl->EraseSize/SECTORSIZE; block++) { | |
671 | if (BlockUsed[block] || BlockDeleted[block]) | |
672 | continue; | |
673 | ||
8593fbc6 TG |
674 | if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) |
675 | + (block * SECTORSIZE), 8 , &retlen, | |
f4a43cfc | 676 | (char *)&bci) < 0) |
1da177e4 LT |
677 | status = SECTOR_IGNORE; |
678 | else | |
679 | status = bci.Status | bci.Status1; | |
680 | ||
681 | switch(status) { | |
682 | case SECTOR_FREE: | |
683 | case SECTOR_IGNORE: | |
684 | break; | |
685 | case SECTOR_USED: | |
686 | BlockUsed[block] = 1; | |
687 | continue; | |
688 | case SECTOR_DELETED: | |
689 | BlockDeleted[block] = 1; | |
690 | continue; | |
691 | default: | |
692 | printk(KERN_WARNING "INFTL: unknown status " | |
693 | "for block %d in EUN %d: 0x%x\n", | |
694 | block, thisEUN, status); | |
695 | } | |
696 | } | |
697 | ||
698 | if (!silly--) { | |
699 | printk(KERN_WARNING "INFTL: infinite loop in Virtual " | |
700 | "Unit Chain 0x%x\n", thisVUC); | |
701 | return; | |
702 | } | |
97894cda | 703 | |
1da177e4 LT |
704 | thisEUN = inftl->PUtable[thisEUN]; |
705 | } | |
706 | ||
707 | for (block = 0; block < inftl->EraseSize/SECTORSIZE; block++) | |
708 | if (BlockUsed[block]) | |
709 | return; | |
710 | ||
711 | /* | |
712 | * For each block in the chain free it and make it available | |
713 | * for future use. Erase from the oldest unit first. | |
714 | */ | |
715 | DEBUG(MTD_DEBUG_LEVEL1, "INFTL: deleting empty VUC %d\n", thisVUC); | |
716 | ||
717 | for (;;) { | |
718 | u16 *prevEUN = &inftl->VUtable[thisVUC]; | |
719 | thisEUN = *prevEUN; | |
720 | ||
721 | /* If the chain is all gone already, we're done */ | |
722 | if (thisEUN == BLOCK_NIL) { | |
723 | DEBUG(MTD_DEBUG_LEVEL2, "INFTL: Empty VUC %d for deletion was already absent\n", thisEUN); | |
724 | return; | |
725 | } | |
726 | ||
727 | /* Find oldest unit in chain. */ | |
728 | while (inftl->PUtable[thisEUN] != BLOCK_NIL) { | |
729 | BUG_ON(thisEUN >= inftl->nb_blocks); | |
730 | ||
731 | prevEUN = &inftl->PUtable[thisEUN]; | |
732 | thisEUN = *prevEUN; | |
733 | } | |
734 | ||
735 | DEBUG(MTD_DEBUG_LEVEL3, "Deleting EUN %d from VUC %d\n", | |
736 | thisEUN, thisVUC); | |
737 | ||
9223a456 | 738 | if (INFTL_formatblock(inftl, thisEUN) < 0) { |
1da177e4 LT |
739 | /* |
740 | * Could not erase : mark block as reserved. | |
741 | */ | |
742 | inftl->PUtable[thisEUN] = BLOCK_RESERVED; | |
9223a456 | 743 | } else { |
1da177e4 LT |
744 | /* Correctly erased : mark it as free */ |
745 | inftl->PUtable[thisEUN] = BLOCK_FREE; | |
746 | inftl->numfreeEUNs++; | |
747 | } | |
748 | ||
749 | /* Now sort out whatever was pointing to it... */ | |
750 | *prevEUN = BLOCK_NIL; | |
751 | ||
752 | /* Ideally we'd actually be responsive to new | |
753 | requests while we're doing this -- if there's | |
754 | free space why should others be made to wait? */ | |
755 | cond_resched(); | |
756 | } | |
757 | ||
758 | inftl->VUtable[thisVUC] = BLOCK_NIL; | |
759 | } | |
760 | ||
761 | static int INFTL_deleteblock(struct INFTLrecord *inftl, unsigned block) | |
762 | { | |
763 | unsigned int thisEUN = inftl->VUtable[block / (inftl->EraseSize / SECTORSIZE)]; | |
764 | unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize - 1); | |
f4a43cfc | 765 | struct mtd_info *mtd = inftl->mbd.mtd; |
1da177e4 LT |
766 | unsigned int status; |
767 | int silly = MAX_LOOPS; | |
768 | size_t retlen; | |
769 | struct inftl_bci bci; | |
770 | ||
771 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_deleteblock(inftl=%p," | |
772 | "block=%d)\n", inftl, block); | |
773 | ||
774 | while (thisEUN < inftl->nb_blocks) { | |
8593fbc6 TG |
775 | if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + |
776 | blockofs, 8, &retlen, (char *)&bci) < 0) | |
1da177e4 LT |
777 | status = SECTOR_IGNORE; |
778 | else | |
779 | status = bci.Status | bci.Status1; | |
780 | ||
781 | switch (status) { | |
782 | case SECTOR_FREE: | |
783 | case SECTOR_IGNORE: | |
784 | break; | |
785 | case SECTOR_DELETED: | |
786 | thisEUN = BLOCK_NIL; | |
787 | goto foundit; | |
788 | case SECTOR_USED: | |
789 | goto foundit; | |
790 | default: | |
791 | printk(KERN_WARNING "INFTL: unknown status for " | |
792 | "block %d in EUN %d: 0x%x\n", | |
793 | block, thisEUN, status); | |
794 | break; | |
795 | } | |
796 | ||
797 | if (!silly--) { | |
798 | printk(KERN_WARNING "INFTL: infinite loop in Virtual " | |
799 | "Unit Chain 0x%x\n", | |
800 | block / (inftl->EraseSize / SECTORSIZE)); | |
801 | return 1; | |
802 | } | |
803 | thisEUN = inftl->PUtable[thisEUN]; | |
804 | } | |
805 | ||
806 | foundit: | |
807 | if (thisEUN != BLOCK_NIL) { | |
808 | loff_t ptr = (thisEUN * inftl->EraseSize) + blockofs; | |
809 | ||
8593fbc6 | 810 | if (inftl_read_oob(mtd, ptr, 8, &retlen, (char *)&bci) < 0) |
1da177e4 LT |
811 | return -EIO; |
812 | bci.Status = bci.Status1 = SECTOR_DELETED; | |
8593fbc6 | 813 | if (inftl_write_oob(mtd, ptr, 8, &retlen, (char *)&bci) < 0) |
1da177e4 LT |
814 | return -EIO; |
815 | INFTL_trydeletechain(inftl, block / (inftl->EraseSize / SECTORSIZE)); | |
816 | } | |
817 | return 0; | |
818 | } | |
819 | ||
97894cda | 820 | static int inftl_writeblock(struct mtd_blktrans_dev *mbd, unsigned long block, |
1da177e4 LT |
821 | char *buffer) |
822 | { | |
823 | struct INFTLrecord *inftl = (void *)mbd; | |
824 | unsigned int writeEUN; | |
825 | unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize - 1); | |
826 | size_t retlen; | |
827 | struct inftl_oob oob; | |
828 | char *p, *pend; | |
829 | ||
830 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: inftl_writeblock(inftl=%p,block=%ld," | |
831 | "buffer=%p)\n", inftl, block, buffer); | |
832 | ||
833 | /* Is block all zero? */ | |
834 | pend = buffer + SECTORSIZE; | |
835 | for (p = buffer; p < pend && !*p; p++) | |
836 | ; | |
837 | ||
838 | if (p < pend) { | |
839 | writeEUN = INFTL_findwriteunit(inftl, block); | |
840 | ||
841 | if (writeEUN == BLOCK_NIL) { | |
842 | printk(KERN_WARNING "inftl_writeblock(): cannot find " | |
843 | "block to write to\n"); | |
844 | /* | |
845 | * If we _still_ haven't got a block to use, | |
846 | * we're screwed. | |
847 | */ | |
848 | return 1; | |
849 | } | |
850 | ||
851 | memset(&oob, 0xff, sizeof(struct inftl_oob)); | |
852 | oob.b.Status = oob.b.Status1 = SECTOR_USED; | |
9223a456 | 853 | |
8593fbc6 TG |
854 | inftl_write(inftl->mbd.mtd, (writeEUN * inftl->EraseSize) + |
855 | blockofs, SECTORSIZE, &retlen, (char *)buffer, | |
856 | (char *)&oob); | |
1da177e4 LT |
857 | /* |
858 | * need to write SECTOR_USED flags since they are not written | |
859 | * in mtd_writeecc | |
860 | */ | |
861 | } else { | |
862 | INFTL_deleteblock(inftl, block); | |
863 | } | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | static int inftl_readblock(struct mtd_blktrans_dev *mbd, unsigned long block, | |
869 | char *buffer) | |
870 | { | |
871 | struct INFTLrecord *inftl = (void *)mbd; | |
872 | unsigned int thisEUN = inftl->VUtable[block / (inftl->EraseSize / SECTORSIZE)]; | |
873 | unsigned long blockofs = (block * SECTORSIZE) & (inftl->EraseSize - 1); | |
f4a43cfc | 874 | struct mtd_info *mtd = inftl->mbd.mtd; |
9223a456 | 875 | unsigned int status; |
1da177e4 | 876 | int silly = MAX_LOOPS; |
9223a456 | 877 | struct inftl_bci bci; |
1da177e4 LT |
878 | size_t retlen; |
879 | ||
880 | DEBUG(MTD_DEBUG_LEVEL3, "INFTL: inftl_readblock(inftl=%p,block=%ld," | |
881 | "buffer=%p)\n", inftl, block, buffer); | |
882 | ||
883 | while (thisEUN < inftl->nb_blocks) { | |
8593fbc6 | 884 | if (inftl_read_oob(mtd, (thisEUN * inftl->EraseSize) + |
f4a43cfc | 885 | blockofs, 8, &retlen, (char *)&bci) < 0) |
1da177e4 LT |
886 | status = SECTOR_IGNORE; |
887 | else | |
888 | status = bci.Status | bci.Status1; | |
889 | ||
890 | switch (status) { | |
891 | case SECTOR_DELETED: | |
892 | thisEUN = BLOCK_NIL; | |
893 | goto foundit; | |
894 | case SECTOR_USED: | |
895 | goto foundit; | |
896 | case SECTOR_FREE: | |
897 | case SECTOR_IGNORE: | |
898 | break; | |
899 | default: | |
900 | printk(KERN_WARNING "INFTL: unknown status for " | |
901 | "block %ld in EUN %d: 0x%04x\n", | |
902 | block, thisEUN, status); | |
903 | break; | |
904 | } | |
905 | ||
906 | if (!silly--) { | |
907 | printk(KERN_WARNING "INFTL: infinite loop in " | |
908 | "Virtual Unit Chain 0x%lx\n", | |
909 | block / (inftl->EraseSize / SECTORSIZE)); | |
910 | return 1; | |
911 | } | |
912 | ||
913 | thisEUN = inftl->PUtable[thisEUN]; | |
914 | } | |
915 | ||
916 | foundit: | |
917 | if (thisEUN == BLOCK_NIL) { | |
918 | /* The requested block is not on the media, return all 0x00 */ | |
919 | memset(buffer, 0, SECTORSIZE); | |
920 | } else { | |
9223a456 | 921 | size_t retlen; |
1da177e4 | 922 | loff_t ptr = (thisEUN * inftl->EraseSize) + blockofs; |
9a1fcdfd TG |
923 | int ret = mtd->read(mtd, ptr, SECTORSIZE, &retlen, buffer); |
924 | ||
925 | /* Handle corrected bit flips gracefully */ | |
926 | if (ret < 0 && ret != -EUCLEAN) | |
1da177e4 LT |
927 | return -EIO; |
928 | } | |
929 | return 0; | |
930 | } | |
931 | ||
932 | static int inftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) | |
933 | { | |
934 | struct INFTLrecord *inftl = (void *)dev; | |
935 | ||
936 | geo->heads = inftl->heads; | |
937 | geo->sectors = inftl->sectors; | |
938 | geo->cylinders = inftl->cylinders; | |
939 | ||
940 | return 0; | |
941 | } | |
942 | ||
943 | static struct mtd_blktrans_ops inftl_tr = { | |
944 | .name = "inftl", | |
945 | .major = INFTL_MAJOR, | |
946 | .part_bits = INFTL_PARTN_BITS, | |
19187672 | 947 | .blksize = 512, |
1da177e4 LT |
948 | .getgeo = inftl_getgeo, |
949 | .readsect = inftl_readblock, | |
950 | .writesect = inftl_writeblock, | |
951 | .add_mtd = inftl_add_mtd, | |
952 | .remove_dev = inftl_remove_dev, | |
953 | .owner = THIS_MODULE, | |
954 | }; | |
955 | ||
1da177e4 LT |
956 | static int __init init_inftl(void) |
957 | { | |
1da177e4 LT |
958 | return register_mtd_blktrans(&inftl_tr); |
959 | } | |
960 | ||
961 | static void __exit cleanup_inftl(void) | |
962 | { | |
963 | deregister_mtd_blktrans(&inftl_tr); | |
964 | } | |
965 | ||
966 | module_init(init_inftl); | |
967 | module_exit(cleanup_inftl); | |
968 | ||
969 | MODULE_LICENSE("GPL"); | |
970 | MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>, David Woodhouse <dwmw2@infradead.org>, Fabrice Bellard <fabrice.bellard@netgem.com> et al."); | |
971 | MODULE_DESCRIPTION("Support code for Inverse Flash Translation Layer, used on M-Systems DiskOnChip 2000, Millennium and Millennium Plus"); |