Commit | Line | Data |
---|---|---|
7d17c02a ML |
1 | /* |
2 | * Copyright © 2009 - Maxim Levitsky | |
3 | * SmartMedia/xD translation layer | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/random.h> | |
13 | #include <linux/hdreg.h> | |
14 | #include <linux/kthread.h> | |
15 | #include <linux/freezer.h> | |
16 | #include <linux/sysfs.h> | |
17 | #include <linux/bitops.h> | |
8da552f2 | 18 | #include <linux/slab.h> |
01de69c2 | 19 | #include <linux/mtd/nand_ecc.h> |
7d17c02a ML |
20 | #include "nand/sm_common.h" |
21 | #include "sm_ftl.h" | |
22 | ||
7d17c02a ML |
23 | |
24 | ||
25 | struct workqueue_struct *cache_flush_workqueue; | |
26 | ||
27 | static int cache_timeout = 1000; | |
f9fbcdc3 | 28 | module_param(cache_timeout, int, S_IRUGO); |
7d17c02a ML |
29 | MODULE_PARM_DESC(cache_timeout, |
30 | "Timeout (in ms) for cache flush (1000 ms default"); | |
31 | ||
32 | static int debug; | |
33 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
34 | MODULE_PARM_DESC(debug, "Debug level (0-2)"); | |
35 | ||
36 | ||
92394b5c | 37 | /* ------------------- sysfs attributes ---------------------------------- */ |
7d17c02a ML |
38 | struct sm_sysfs_attribute { |
39 | struct device_attribute dev_attr; | |
40 | char *data; | |
41 | int len; | |
42 | }; | |
43 | ||
44 | ssize_t sm_attr_show(struct device *dev, struct device_attribute *attr, | |
45 | char *buf) | |
46 | { | |
47 | struct sm_sysfs_attribute *sm_attr = | |
48 | container_of(attr, struct sm_sysfs_attribute, dev_attr); | |
49 | ||
50 | strncpy(buf, sm_attr->data, sm_attr->len); | |
51 | return sm_attr->len; | |
52 | } | |
53 | ||
54 | ||
55 | #define NUM_ATTRIBUTES 1 | |
56 | #define SM_CIS_VENDOR_OFFSET 0x59 | |
57 | struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl) | |
58 | { | |
59 | struct attribute_group *attr_group; | |
60 | struct attribute **attributes; | |
61 | struct sm_sysfs_attribute *vendor_attribute; | |
67876f85 | 62 | char *vendor; |
7d17c02a | 63 | |
67876f85 DC |
64 | vendor = kstrndup(ftl->cis_buffer + SM_CIS_VENDOR_OFFSET, |
65 | SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET, GFP_KERNEL); | |
629286b9 XW |
66 | if (!vendor) |
67 | goto error1; | |
7d17c02a ML |
68 | |
69 | /* Initialize sysfs attributes */ | |
70 | vendor_attribute = | |
71 | kzalloc(sizeof(struct sm_sysfs_attribute), GFP_KERNEL); | |
629286b9 XW |
72 | if (!vendor_attribute) |
73 | goto error2; | |
7d17c02a | 74 | |
ca7081d9 ML |
75 | sysfs_attr_init(&vendor_attribute->dev_attr.attr); |
76 | ||
7d17c02a | 77 | vendor_attribute->data = vendor; |
67876f85 | 78 | vendor_attribute->len = strlen(vendor); |
7d17c02a ML |
79 | vendor_attribute->dev_attr.attr.name = "vendor"; |
80 | vendor_attribute->dev_attr.attr.mode = S_IRUGO; | |
81 | vendor_attribute->dev_attr.show = sm_attr_show; | |
82 | ||
83 | ||
84 | /* Create array of pointers to the attributes */ | |
85 | attributes = kzalloc(sizeof(struct attribute *) * (NUM_ATTRIBUTES + 1), | |
86 | GFP_KERNEL); | |
629286b9 XW |
87 | if (!attributes) |
88 | goto error3; | |
7d17c02a ML |
89 | attributes[0] = &vendor_attribute->dev_attr.attr; |
90 | ||
91 | /* Finally create the attribute group */ | |
92 | attr_group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL); | |
629286b9 XW |
93 | if (!attr_group) |
94 | goto error4; | |
7d17c02a ML |
95 | attr_group->attrs = attributes; |
96 | return attr_group; | |
629286b9 XW |
97 | error4: |
98 | kfree(attributes); | |
99 | error3: | |
100 | kfree(vendor_attribute); | |
101 | error2: | |
102 | kfree(vendor); | |
103 | error1: | |
104 | return NULL; | |
7d17c02a ML |
105 | } |
106 | ||
107 | void sm_delete_sysfs_attributes(struct sm_ftl *ftl) | |
108 | { | |
109 | struct attribute **attributes = ftl->disk_attributes->attrs; | |
110 | int i; | |
111 | ||
112 | for (i = 0; attributes[i] ; i++) { | |
113 | ||
114 | struct device_attribute *dev_attr = container_of(attributes[i], | |
115 | struct device_attribute, attr); | |
116 | ||
117 | struct sm_sysfs_attribute *sm_attr = | |
118 | container_of(dev_attr, | |
119 | struct sm_sysfs_attribute, dev_attr); | |
120 | ||
121 | kfree(sm_attr->data); | |
122 | kfree(sm_attr); | |
123 | } | |
124 | ||
125 | kfree(ftl->disk_attributes->attrs); | |
126 | kfree(ftl->disk_attributes); | |
127 | } | |
128 | ||
129 | ||
130 | /* ----------------------- oob helpers -------------------------------------- */ | |
131 | ||
132 | static int sm_get_lba(uint8_t *lba) | |
133 | { | |
134 | /* check fixed bits */ | |
135 | if ((lba[0] & 0xF8) != 0x10) | |
136 | return -2; | |
137 | ||
7854d3f7 | 138 | /* check parity - endianness doesn't matter */ |
7d17c02a ML |
139 | if (hweight16(*(uint16_t *)lba) & 1) |
140 | return -2; | |
141 | ||
142 | return (lba[1] >> 1) | ((lba[0] & 0x07) << 7); | |
143 | } | |
144 | ||
145 | ||
146 | /* | |
92394b5c | 147 | * Read LBA associated with block |
7d17c02a ML |
148 | * returns -1, if block is erased |
149 | * returns -2 if error happens | |
150 | */ | |
151 | static int sm_read_lba(struct sm_oob *oob) | |
152 | { | |
153 | static const uint32_t erased_pattern[4] = { | |
154 | 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; | |
155 | ||
156 | uint16_t lba_test; | |
157 | int lba; | |
158 | ||
159 | /* First test for erased block */ | |
160 | if (!memcmp(oob, erased_pattern, SM_OOB_SIZE)) | |
161 | return -1; | |
162 | ||
163 | /* Now check is both copies of the LBA differ too much */ | |
164 | lba_test = *(uint16_t *)oob->lba_copy1 ^ *(uint16_t*)oob->lba_copy2; | |
165 | if (lba_test && !is_power_of_2(lba_test)) | |
166 | return -2; | |
167 | ||
168 | /* And read it */ | |
169 | lba = sm_get_lba(oob->lba_copy1); | |
170 | ||
171 | if (lba == -2) | |
172 | lba = sm_get_lba(oob->lba_copy2); | |
173 | ||
174 | return lba; | |
175 | } | |
176 | ||
177 | static void sm_write_lba(struct sm_oob *oob, uint16_t lba) | |
178 | { | |
179 | uint8_t tmp[2]; | |
180 | ||
181 | WARN_ON(lba >= 1000); | |
182 | ||
183 | tmp[0] = 0x10 | ((lba >> 7) & 0x07); | |
184 | tmp[1] = (lba << 1) & 0xFF; | |
185 | ||
186 | if (hweight16(*(uint16_t *)tmp) & 0x01) | |
187 | tmp[1] |= 1; | |
188 | ||
189 | oob->lba_copy1[0] = oob->lba_copy2[0] = tmp[0]; | |
190 | oob->lba_copy1[1] = oob->lba_copy2[1] = tmp[1]; | |
191 | } | |
192 | ||
193 | ||
194 | /* Make offset from parts */ | |
195 | static loff_t sm_mkoffset(struct sm_ftl *ftl, int zone, int block, int boffset) | |
196 | { | |
197 | WARN_ON(boffset & (SM_SECTOR_SIZE - 1)); | |
198 | WARN_ON(zone < 0 || zone >= ftl->zone_count); | |
199 | WARN_ON(block >= ftl->zone_size); | |
200 | WARN_ON(boffset >= ftl->block_size); | |
201 | ||
202 | if (block == -1) | |
203 | return -1; | |
204 | ||
205 | return (zone * SM_MAX_ZONE_SIZE + block) * ftl->block_size + boffset; | |
206 | } | |
207 | ||
208 | /* Breaks offset into parts */ | |
209 | static void sm_break_offset(struct sm_ftl *ftl, loff_t offset, | |
210 | int *zone, int *block, int *boffset) | |
211 | { | |
212 | *boffset = do_div(offset, ftl->block_size); | |
213 | *block = do_div(offset, ftl->max_lba); | |
214 | *zone = offset >= ftl->zone_count ? -1 : offset; | |
215 | } | |
216 | ||
217 | /* ---------------------- low level IO ------------------------------------- */ | |
218 | ||
219 | static int sm_correct_sector(uint8_t *buffer, struct sm_oob *oob) | |
220 | { | |
7d17c02a ML |
221 | uint8_t ecc[3]; |
222 | ||
223 | __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc); | |
224 | if (__nand_correct_data(buffer, ecc, oob->ecc1, SM_SMALL_PAGE) < 0) | |
225 | return -EIO; | |
226 | ||
227 | buffer += SM_SMALL_PAGE; | |
228 | ||
229 | __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc); | |
230 | if (__nand_correct_data(buffer, ecc, oob->ecc2, SM_SMALL_PAGE) < 0) | |
231 | return -EIO; | |
7d17c02a ML |
232 | return 0; |
233 | } | |
234 | ||
235 | /* Reads a sector + oob*/ | |
236 | static int sm_read_sector(struct sm_ftl *ftl, | |
237 | int zone, int block, int boffset, | |
238 | uint8_t *buffer, struct sm_oob *oob) | |
239 | { | |
240 | struct mtd_info *mtd = ftl->trans->mtd; | |
241 | struct mtd_oob_ops ops; | |
242 | struct sm_oob tmp_oob; | |
133fa8c7 | 243 | int ret = -EIO; |
7d17c02a ML |
244 | int try = 0; |
245 | ||
246 | /* FTL can contain -1 entries that are by default filled with bits */ | |
247 | if (block == -1) { | |
248 | memset(buffer, 0xFF, SM_SECTOR_SIZE); | |
249 | return 0; | |
250 | } | |
251 | ||
92394b5c | 252 | /* User might not need the oob, but we do for data verification */ |
7d17c02a ML |
253 | if (!oob) |
254 | oob = &tmp_oob; | |
255 | ||
0612b9dd | 256 | ops.mode = ftl->smallpagenand ? MTD_OPS_RAW : MTD_OPS_PLACE_OOB; |
7d17c02a ML |
257 | ops.ooboffs = 0; |
258 | ops.ooblen = SM_OOB_SIZE; | |
259 | ops.oobbuf = (void *)oob; | |
260 | ops.len = SM_SECTOR_SIZE; | |
261 | ops.datbuf = buffer; | |
262 | ||
263 | again: | |
264 | if (try++) { | |
265 | /* Avoid infinite recursion on CIS reads, sm_recheck_media | |
266 | won't help anyway */ | |
267 | if (zone == 0 && block == ftl->cis_block && boffset == | |
268 | ftl->cis_boffset) | |
269 | return ret; | |
270 | ||
271 | /* Test if media is stable */ | |
272 | if (try == 3 || sm_recheck_media(ftl)) | |
273 | return ret; | |
274 | } | |
275 | ||
92394b5c | 276 | /* Unfortunately, oob read will _always_ succeed, |
7d17c02a | 277 | despite card removal..... */ |
fd2819bb | 278 | ret = mtd_read_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops); |
7d17c02a ML |
279 | |
280 | /* Test for unknown errors */ | |
d57f4054 | 281 | if (ret != 0 && !mtd_is_bitflip_or_eccerr(ret)) { |
7d17c02a ML |
282 | dbg("read of block %d at zone %d, failed due to error (%d)", |
283 | block, zone, ret); | |
284 | goto again; | |
285 | } | |
286 | ||
287 | /* Do a basic test on the oob, to guard against returned garbage */ | |
288 | if (oob->reserved != 0xFFFFFFFF && !is_power_of_2(~oob->reserved)) | |
289 | goto again; | |
290 | ||
291 | /* This should never happen, unless there is a bug in the mtd driver */ | |
292 | WARN_ON(ops.oobretlen != SM_OOB_SIZE); | |
293 | WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE); | |
294 | ||
295 | if (!buffer) | |
296 | return 0; | |
297 | ||
298 | /* Test if sector marked as bad */ | |
299 | if (!sm_sector_valid(oob)) { | |
300 | dbg("read of block %d at zone %d, failed because it is marked" | |
301 | " as bad" , block, zone); | |
302 | goto again; | |
303 | } | |
304 | ||
305 | /* Test ECC*/ | |
d57f4054 | 306 | if (mtd_is_eccerr(ret) || |
7d17c02a ML |
307 | (ftl->smallpagenand && sm_correct_sector(buffer, oob))) { |
308 | ||
309 | dbg("read of block %d at zone %d, failed due to ECC error", | |
310 | block, zone); | |
311 | goto again; | |
312 | } | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | /* Writes a sector to media */ | |
318 | static int sm_write_sector(struct sm_ftl *ftl, | |
319 | int zone, int block, int boffset, | |
320 | uint8_t *buffer, struct sm_oob *oob) | |
321 | { | |
322 | struct mtd_oob_ops ops; | |
323 | struct mtd_info *mtd = ftl->trans->mtd; | |
324 | int ret; | |
325 | ||
326 | BUG_ON(ftl->readonly); | |
327 | ||
328 | if (zone == 0 && (block == ftl->cis_block || block == 0)) { | |
329 | dbg("attempted to write the CIS!"); | |
330 | return -EIO; | |
331 | } | |
332 | ||
333 | if (ftl->unstable) | |
334 | return -EIO; | |
335 | ||
0612b9dd | 336 | ops.mode = ftl->smallpagenand ? MTD_OPS_RAW : MTD_OPS_PLACE_OOB; |
7d17c02a ML |
337 | ops.len = SM_SECTOR_SIZE; |
338 | ops.datbuf = buffer; | |
339 | ops.ooboffs = 0; | |
340 | ops.ooblen = SM_OOB_SIZE; | |
341 | ops.oobbuf = (void *)oob; | |
342 | ||
a2cc5ba0 | 343 | ret = mtd_write_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops); |
7d17c02a ML |
344 | |
345 | /* Now we assume that hardware will catch write bitflip errors */ | |
7d17c02a ML |
346 | |
347 | if (ret) { | |
348 | dbg("write to block %d at zone %d, failed with error %d", | |
349 | block, zone, ret); | |
350 | ||
351 | sm_recheck_media(ftl); | |
352 | return ret; | |
353 | } | |
354 | ||
355 | /* This should never happen, unless there is a bug in the driver */ | |
356 | WARN_ON(ops.oobretlen != SM_OOB_SIZE); | |
357 | WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE); | |
358 | ||
359 | return 0; | |
360 | } | |
361 | ||
362 | /* ------------------------ block IO ------------------------------------- */ | |
363 | ||
364 | /* Write a block using data and lba, and invalid sector bitmap */ | |
365 | static int sm_write_block(struct sm_ftl *ftl, uint8_t *buf, | |
366 | int zone, int block, int lba, | |
367 | unsigned long invalid_bitmap) | |
368 | { | |
369 | struct sm_oob oob; | |
370 | int boffset; | |
371 | int retry = 0; | |
372 | ||
373 | /* Initialize the oob with requested values */ | |
374 | memset(&oob, 0xFF, SM_OOB_SIZE); | |
375 | sm_write_lba(&oob, lba); | |
376 | restart: | |
377 | if (ftl->unstable) | |
378 | return -EIO; | |
379 | ||
380 | for (boffset = 0; boffset < ftl->block_size; | |
381 | boffset += SM_SECTOR_SIZE) { | |
382 | ||
383 | oob.data_status = 0xFF; | |
384 | ||
385 | if (test_bit(boffset / SM_SECTOR_SIZE, &invalid_bitmap)) { | |
386 | ||
387 | sm_printk("sector %d of block at LBA %d of zone %d" | |
388 | " coudn't be read, marking it as invalid", | |
389 | boffset / SM_SECTOR_SIZE, lba, zone); | |
390 | ||
391 | oob.data_status = 0; | |
392 | } | |
393 | ||
7d17c02a ML |
394 | if (ftl->smallpagenand) { |
395 | __nand_calculate_ecc(buf + boffset, | |
396 | SM_SMALL_PAGE, oob.ecc1); | |
397 | ||
398 | __nand_calculate_ecc(buf + boffset + SM_SMALL_PAGE, | |
399 | SM_SMALL_PAGE, oob.ecc2); | |
400 | } | |
7d17c02a ML |
401 | if (!sm_write_sector(ftl, zone, block, boffset, |
402 | buf + boffset, &oob)) | |
403 | continue; | |
404 | ||
405 | if (!retry) { | |
406 | ||
407 | /* If write fails. try to erase the block */ | |
408 | /* This is safe, because we never write in blocks | |
409 | that contain valuable data. | |
410 | This is intended to repair block that are marked | |
411 | as erased, but that isn't fully erased*/ | |
412 | ||
413 | if (sm_erase_block(ftl, zone, block, 0)) | |
414 | return -EIO; | |
415 | ||
416 | retry = 1; | |
417 | goto restart; | |
418 | } else { | |
419 | sm_mark_block_bad(ftl, zone, block); | |
420 | return -EIO; | |
421 | } | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | ||
427 | /* Mark whole block at offset 'offs' as bad. */ | |
428 | static void sm_mark_block_bad(struct sm_ftl *ftl, int zone, int block) | |
429 | { | |
430 | struct sm_oob oob; | |
431 | int boffset; | |
432 | ||
433 | memset(&oob, 0xFF, SM_OOB_SIZE); | |
434 | oob.block_status = 0xF0; | |
435 | ||
436 | if (ftl->unstable) | |
437 | return; | |
438 | ||
439 | if (sm_recheck_media(ftl)) | |
440 | return; | |
441 | ||
442 | sm_printk("marking block %d of zone %d as bad", block, zone); | |
443 | ||
444 | /* We aren't checking the return value, because we don't care */ | |
445 | /* This also fails on fake xD cards, but I guess these won't expose | |
92394b5c | 446 | any bad blocks till fail completely */ |
7d17c02a ML |
447 | for (boffset = 0; boffset < ftl->block_size; boffset += SM_SECTOR_SIZE) |
448 | sm_write_sector(ftl, zone, block, boffset, NULL, &oob); | |
449 | } | |
450 | ||
451 | /* | |
452 | * Erase a block within a zone | |
92394b5c | 453 | * If erase succeeds, it updates free block fifo, otherwise marks block as bad |
7d17c02a ML |
454 | */ |
455 | static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block, | |
456 | int put_free) | |
457 | { | |
458 | struct ftl_zone *zone = &ftl->zones[zone_num]; | |
459 | struct mtd_info *mtd = ftl->trans->mtd; | |
460 | struct erase_info erase; | |
461 | ||
462 | erase.mtd = mtd; | |
463 | erase.callback = sm_erase_callback; | |
464 | erase.addr = sm_mkoffset(ftl, zone_num, block, 0); | |
465 | erase.len = ftl->block_size; | |
466 | erase.priv = (u_long)ftl; | |
467 | ||
468 | if (ftl->unstable) | |
469 | return -EIO; | |
470 | ||
471 | BUG_ON(ftl->readonly); | |
472 | ||
473 | if (zone_num == 0 && (block == ftl->cis_block || block == 0)) { | |
474 | sm_printk("attempted to erase the CIS!"); | |
475 | return -EIO; | |
476 | } | |
477 | ||
7e1f0dc0 | 478 | if (mtd_erase(mtd, &erase)) { |
7d17c02a ML |
479 | sm_printk("erase of block %d in zone %d failed", |
480 | block, zone_num); | |
481 | goto error; | |
482 | } | |
483 | ||
484 | if (erase.state == MTD_ERASE_PENDING) | |
485 | wait_for_completion(&ftl->erase_completion); | |
486 | ||
487 | if (erase.state != MTD_ERASE_DONE) { | |
488 | sm_printk("erase of block %d in zone %d failed after wait", | |
489 | block, zone_num); | |
490 | goto error; | |
491 | } | |
492 | ||
493 | if (put_free) | |
494 | kfifo_in(&zone->free_sectors, | |
495 | (const unsigned char *)&block, sizeof(block)); | |
496 | ||
497 | return 0; | |
498 | error: | |
499 | sm_mark_block_bad(ftl, zone_num, block); | |
500 | return -EIO; | |
501 | } | |
502 | ||
503 | static void sm_erase_callback(struct erase_info *self) | |
504 | { | |
505 | struct sm_ftl *ftl = (struct sm_ftl *)self->priv; | |
506 | complete(&ftl->erase_completion); | |
507 | } | |
508 | ||
92394b5c | 509 | /* Thoroughly test that block is valid. */ |
7d17c02a ML |
510 | static int sm_check_block(struct sm_ftl *ftl, int zone, int block) |
511 | { | |
512 | int boffset; | |
513 | struct sm_oob oob; | |
514 | int lbas[] = { -3, 0, 0, 0 }; | |
515 | int i = 0; | |
516 | int test_lba; | |
517 | ||
518 | ||
519 | /* First just check that block doesn't look fishy */ | |
520 | /* Only blocks that are valid or are sliced in two parts, are | |
521 | accepted */ | |
522 | for (boffset = 0; boffset < ftl->block_size; | |
523 | boffset += SM_SECTOR_SIZE) { | |
524 | ||
92394b5c | 525 | /* This shouldn't happen anyway */ |
7d17c02a ML |
526 | if (sm_read_sector(ftl, zone, block, boffset, NULL, &oob)) |
527 | return -2; | |
528 | ||
529 | test_lba = sm_read_lba(&oob); | |
530 | ||
531 | if (lbas[i] != test_lba) | |
532 | lbas[++i] = test_lba; | |
533 | ||
534 | /* If we found three different LBAs, something is fishy */ | |
535 | if (i == 3) | |
536 | return -EIO; | |
537 | } | |
538 | ||
25985edc | 539 | /* If the block is sliced (partially erased usually) erase it */ |
7d17c02a ML |
540 | if (i == 2) { |
541 | sm_erase_block(ftl, zone, block, 1); | |
542 | return 1; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | /* ----------------- media scanning --------------------------------- */ | |
549 | static const struct chs_entry chs_table[] = { | |
550 | { 1, 125, 4, 4 }, | |
551 | { 2, 125, 4, 8 }, | |
552 | { 4, 250, 4, 8 }, | |
553 | { 8, 250, 4, 16 }, | |
554 | { 16, 500, 4, 16 }, | |
555 | { 32, 500, 8, 16 }, | |
556 | { 64, 500, 8, 32 }, | |
557 | { 128, 500, 16, 32 }, | |
558 | { 256, 1000, 16, 32 }, | |
559 | { 512, 1015, 32, 63 }, | |
560 | { 1024, 985, 33, 63 }, | |
561 | { 2048, 985, 33, 63 }, | |
562 | { 0 }, | |
563 | }; | |
564 | ||
565 | ||
566 | static const uint8_t cis_signature[] = { | |
567 | 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 | |
568 | }; | |
569 | /* Find out media parameters. | |
570 | * This ideally has to be based on nand id, but for now device size is enough */ | |
571 | int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd) | |
572 | { | |
573 | int i; | |
574 | int size_in_megs = mtd->size / (1024 * 1024); | |
575 | ||
576 | ftl->readonly = mtd->type == MTD_ROM; | |
577 | ||
578 | /* Manual settings for very old devices */ | |
579 | ftl->zone_count = 1; | |
580 | ftl->smallpagenand = 0; | |
581 | ||
582 | switch (size_in_megs) { | |
583 | case 1: | |
584 | /* 1 MiB flash/rom SmartMedia card (256 byte pages)*/ | |
585 | ftl->zone_size = 256; | |
586 | ftl->max_lba = 250; | |
587 | ftl->block_size = 8 * SM_SECTOR_SIZE; | |
588 | ftl->smallpagenand = 1; | |
589 | ||
590 | break; | |
591 | case 2: | |
592 | /* 2 MiB flash SmartMedia (256 byte pages)*/ | |
593 | if (mtd->writesize == SM_SMALL_PAGE) { | |
594 | ftl->zone_size = 512; | |
595 | ftl->max_lba = 500; | |
596 | ftl->block_size = 8 * SM_SECTOR_SIZE; | |
597 | ftl->smallpagenand = 1; | |
598 | /* 2 MiB rom SmartMedia */ | |
599 | } else { | |
600 | ||
601 | if (!ftl->readonly) | |
602 | return -ENODEV; | |
603 | ||
604 | ftl->zone_size = 256; | |
605 | ftl->max_lba = 250; | |
606 | ftl->block_size = 16 * SM_SECTOR_SIZE; | |
607 | } | |
608 | break; | |
609 | case 4: | |
610 | /* 4 MiB flash/rom SmartMedia device */ | |
611 | ftl->zone_size = 512; | |
612 | ftl->max_lba = 500; | |
613 | ftl->block_size = 16 * SM_SECTOR_SIZE; | |
614 | break; | |
615 | case 8: | |
616 | /* 8 MiB flash/rom SmartMedia device */ | |
617 | ftl->zone_size = 1024; | |
618 | ftl->max_lba = 1000; | |
619 | ftl->block_size = 16 * SM_SECTOR_SIZE; | |
620 | } | |
621 | ||
622 | /* Minimum xD size is 16MiB. Also, all xD cards have standard zone | |
623 | sizes. SmartMedia cards exist up to 128 MiB and have same layout*/ | |
624 | if (size_in_megs >= 16) { | |
625 | ftl->zone_count = size_in_megs / 16; | |
626 | ftl->zone_size = 1024; | |
627 | ftl->max_lba = 1000; | |
628 | ftl->block_size = 32 * SM_SECTOR_SIZE; | |
629 | } | |
630 | ||
631 | /* Test for proper write,erase and oob sizes */ | |
632 | if (mtd->erasesize > ftl->block_size) | |
633 | return -ENODEV; | |
634 | ||
635 | if (mtd->writesize > SM_SECTOR_SIZE) | |
636 | return -ENODEV; | |
637 | ||
638 | if (ftl->smallpagenand && mtd->oobsize < SM_SMALL_OOB_SIZE) | |
639 | return -ENODEV; | |
640 | ||
641 | if (!ftl->smallpagenand && mtd->oobsize < SM_OOB_SIZE) | |
642 | return -ENODEV; | |
643 | ||
fc002e3c AB |
644 | /* We use OOB */ |
645 | if (!mtd_has_oob(mtd)) | |
7d17c02a ML |
646 | return -ENODEV; |
647 | ||
648 | /* Find geometry information */ | |
649 | for (i = 0 ; i < ARRAY_SIZE(chs_table) ; i++) { | |
650 | if (chs_table[i].size == size_in_megs) { | |
651 | ftl->cylinders = chs_table[i].cyl; | |
652 | ftl->heads = chs_table[i].head; | |
653 | ftl->sectors = chs_table[i].sec; | |
654 | return 0; | |
655 | } | |
656 | } | |
657 | ||
658 | sm_printk("media has unknown size : %dMiB", size_in_megs); | |
659 | ftl->cylinders = 985; | |
660 | ftl->heads = 33; | |
661 | ftl->sectors = 63; | |
662 | return 0; | |
663 | } | |
664 | ||
665 | /* Validate the CIS */ | |
666 | static int sm_read_cis(struct sm_ftl *ftl) | |
667 | { | |
668 | struct sm_oob oob; | |
669 | ||
670 | if (sm_read_sector(ftl, | |
671 | 0, ftl->cis_block, ftl->cis_boffset, ftl->cis_buffer, &oob)) | |
672 | return -EIO; | |
673 | ||
674 | if (!sm_sector_valid(&oob) || !sm_block_valid(&oob)) | |
675 | return -EIO; | |
676 | ||
677 | if (!memcmp(ftl->cis_buffer + ftl->cis_page_offset, | |
678 | cis_signature, sizeof(cis_signature))) { | |
679 | return 0; | |
680 | } | |
681 | ||
682 | return -EIO; | |
683 | } | |
684 | ||
685 | /* Scan the media for the CIS */ | |
686 | static int sm_find_cis(struct sm_ftl *ftl) | |
687 | { | |
688 | struct sm_oob oob; | |
689 | int block, boffset; | |
690 | int block_found = 0; | |
691 | int cis_found = 0; | |
692 | ||
693 | /* Search for first valid block */ | |
694 | for (block = 0 ; block < ftl->zone_size - ftl->max_lba ; block++) { | |
695 | ||
696 | if (sm_read_sector(ftl, 0, block, 0, NULL, &oob)) | |
697 | continue; | |
698 | ||
699 | if (!sm_block_valid(&oob)) | |
700 | continue; | |
701 | block_found = 1; | |
702 | break; | |
703 | } | |
704 | ||
705 | if (!block_found) | |
706 | return -EIO; | |
707 | ||
708 | /* Search for first valid sector in this block */ | |
709 | for (boffset = 0 ; boffset < ftl->block_size; | |
710 | boffset += SM_SECTOR_SIZE) { | |
711 | ||
712 | if (sm_read_sector(ftl, 0, block, boffset, NULL, &oob)) | |
713 | continue; | |
714 | ||
715 | if (!sm_sector_valid(&oob)) | |
716 | continue; | |
717 | break; | |
718 | } | |
719 | ||
720 | if (boffset == ftl->block_size) | |
721 | return -EIO; | |
722 | ||
723 | ftl->cis_block = block; | |
724 | ftl->cis_boffset = boffset; | |
725 | ftl->cis_page_offset = 0; | |
726 | ||
727 | cis_found = !sm_read_cis(ftl); | |
728 | ||
729 | if (!cis_found) { | |
730 | ftl->cis_page_offset = SM_SMALL_PAGE; | |
731 | cis_found = !sm_read_cis(ftl); | |
732 | } | |
733 | ||
734 | if (cis_found) { | |
735 | dbg("CIS block found at offset %x", | |
736 | block * ftl->block_size + | |
737 | boffset + ftl->cis_page_offset); | |
738 | return 0; | |
739 | } | |
740 | return -EIO; | |
741 | } | |
742 | ||
743 | /* Basic test to determine if underlying mtd device if functional */ | |
744 | static int sm_recheck_media(struct sm_ftl *ftl) | |
745 | { | |
746 | if (sm_read_cis(ftl)) { | |
747 | ||
748 | if (!ftl->unstable) { | |
749 | sm_printk("media unstable, not allowing writes"); | |
750 | ftl->unstable = 1; | |
751 | } | |
752 | return -EIO; | |
753 | } | |
754 | return 0; | |
755 | } | |
756 | ||
757 | /* Initialize a FTL zone */ | |
758 | static int sm_init_zone(struct sm_ftl *ftl, int zone_num) | |
759 | { | |
760 | struct ftl_zone *zone = &ftl->zones[zone_num]; | |
761 | struct sm_oob oob; | |
762 | uint16_t block; | |
763 | int lba; | |
764 | int i = 0; | |
133fa8c7 | 765 | int len; |
7d17c02a ML |
766 | |
767 | dbg("initializing zone %d", zone_num); | |
768 | ||
769 | /* Allocate memory for FTL table */ | |
770 | zone->lba_to_phys_table = kmalloc(ftl->max_lba * 2, GFP_KERNEL); | |
771 | ||
772 | if (!zone->lba_to_phys_table) | |
773 | return -ENOMEM; | |
774 | memset(zone->lba_to_phys_table, -1, ftl->max_lba * 2); | |
775 | ||
776 | ||
777 | /* Allocate memory for free sectors FIFO */ | |
778 | if (kfifo_alloc(&zone->free_sectors, ftl->zone_size * 2, GFP_KERNEL)) { | |
779 | kfree(zone->lba_to_phys_table); | |
780 | return -ENOMEM; | |
781 | } | |
782 | ||
783 | /* Now scan the zone */ | |
784 | for (block = 0 ; block < ftl->zone_size ; block++) { | |
785 | ||
786 | /* Skip blocks till the CIS (including) */ | |
787 | if (zone_num == 0 && block <= ftl->cis_block) | |
788 | continue; | |
789 | ||
790 | /* Read the oob of first sector */ | |
791 | if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob)) | |
792 | return -EIO; | |
793 | ||
794 | /* Test to see if block is erased. It is enough to test | |
795 | first sector, because erase happens in one shot */ | |
796 | if (sm_block_erased(&oob)) { | |
797 | kfifo_in(&zone->free_sectors, | |
798 | (unsigned char *)&block, 2); | |
799 | continue; | |
800 | } | |
801 | ||
802 | /* If block is marked as bad, skip it */ | |
803 | /* This assumes we can trust first sector*/ | |
804 | /* However the way the block valid status is defined, ensures | |
805 | very low probability of failure here */ | |
806 | if (!sm_block_valid(&oob)) { | |
807 | dbg("PH %04d <-> <marked bad>", block); | |
808 | continue; | |
809 | } | |
810 | ||
811 | ||
812 | lba = sm_read_lba(&oob); | |
813 | ||
814 | /* Invalid LBA means that block is damaged. */ | |
815 | /* We can try to erase it, or mark it as bad, but | |
816 | lets leave that to recovery application */ | |
817 | if (lba == -2 || lba >= ftl->max_lba) { | |
818 | dbg("PH %04d <-> LBA %04d(bad)", block, lba); | |
819 | continue; | |
820 | } | |
821 | ||
822 | ||
823 | /* If there is no collision, | |
824 | just put the sector in the FTL table */ | |
825 | if (zone->lba_to_phys_table[lba] < 0) { | |
826 | dbg_verbose("PH %04d <-> LBA %04d", block, lba); | |
827 | zone->lba_to_phys_table[lba] = block; | |
828 | continue; | |
829 | } | |
830 | ||
831 | sm_printk("collision" | |
832 | " of LBA %d between blocks %d and %d in zone %d", | |
833 | lba, zone->lba_to_phys_table[lba], block, zone_num); | |
834 | ||
835 | /* Test that this block is valid*/ | |
836 | if (sm_check_block(ftl, zone_num, block)) | |
837 | continue; | |
838 | ||
839 | /* Test now the old block */ | |
840 | if (sm_check_block(ftl, zone_num, | |
841 | zone->lba_to_phys_table[lba])) { | |
842 | zone->lba_to_phys_table[lba] = block; | |
843 | continue; | |
844 | } | |
845 | ||
846 | /* If both blocks are valid and share same LBA, it means that | |
847 | they hold different versions of same data. It not | |
848 | known which is more recent, thus just erase one of them | |
849 | */ | |
850 | sm_printk("both blocks are valid, erasing the later"); | |
851 | sm_erase_block(ftl, zone_num, block, 1); | |
852 | } | |
853 | ||
854 | dbg("zone initialized"); | |
855 | zone->initialized = 1; | |
856 | ||
857 | /* No free sectors, means that the zone is heavily damaged, write won't | |
858 | work, but it can still can be (partially) read */ | |
859 | if (!kfifo_len(&zone->free_sectors)) { | |
860 | sm_printk("no free blocks in zone %d", zone_num); | |
861 | return 0; | |
862 | } | |
863 | ||
864 | /* Randomize first block we write to */ | |
865 | get_random_bytes(&i, 2); | |
866 | i %= (kfifo_len(&zone->free_sectors) / 2); | |
867 | ||
868 | while (i--) { | |
133fa8c7 ML |
869 | len = kfifo_out(&zone->free_sectors, |
870 | (unsigned char *)&block, 2); | |
871 | WARN_ON(len != 2); | |
7d17c02a ML |
872 | kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2); |
873 | } | |
874 | return 0; | |
875 | } | |
876 | ||
25985edc | 877 | /* Get and automatically initialize an FTL mapping for one zone */ |
7d17c02a ML |
878 | struct ftl_zone *sm_get_zone(struct sm_ftl *ftl, int zone_num) |
879 | { | |
880 | struct ftl_zone *zone; | |
881 | int error; | |
882 | ||
883 | BUG_ON(zone_num >= ftl->zone_count); | |
884 | zone = &ftl->zones[zone_num]; | |
885 | ||
886 | if (!zone->initialized) { | |
887 | error = sm_init_zone(ftl, zone_num); | |
888 | ||
889 | if (error) | |
890 | return ERR_PTR(error); | |
891 | } | |
892 | return zone; | |
893 | } | |
894 | ||
895 | ||
896 | /* ----------------- cache handling ------------------------------------------*/ | |
897 | ||
898 | /* Initialize the one block cache */ | |
899 | void sm_cache_init(struct sm_ftl *ftl) | |
900 | { | |
901 | ftl->cache_data_invalid_bitmap = 0xFFFFFFFF; | |
902 | ftl->cache_clean = 1; | |
903 | ftl->cache_zone = -1; | |
904 | ftl->cache_block = -1; | |
905 | /*memset(ftl->cache_data, 0xAA, ftl->block_size);*/ | |
906 | } | |
907 | ||
908 | /* Put sector in one block cache */ | |
909 | void sm_cache_put(struct sm_ftl *ftl, char *buffer, int boffset) | |
910 | { | |
911 | memcpy(ftl->cache_data + boffset, buffer, SM_SECTOR_SIZE); | |
912 | clear_bit(boffset / SM_SECTOR_SIZE, &ftl->cache_data_invalid_bitmap); | |
913 | ftl->cache_clean = 0; | |
914 | } | |
915 | ||
916 | /* Read a sector from the cache */ | |
917 | int sm_cache_get(struct sm_ftl *ftl, char *buffer, int boffset) | |
918 | { | |
919 | if (test_bit(boffset / SM_SECTOR_SIZE, | |
920 | &ftl->cache_data_invalid_bitmap)) | |
921 | return -1; | |
922 | ||
923 | memcpy(buffer, ftl->cache_data + boffset, SM_SECTOR_SIZE); | |
924 | return 0; | |
925 | } | |
926 | ||
927 | /* Write the cache to hardware */ | |
928 | int sm_cache_flush(struct sm_ftl *ftl) | |
929 | { | |
930 | struct ftl_zone *zone; | |
931 | ||
932 | int sector_num; | |
933 | uint16_t write_sector; | |
934 | int zone_num = ftl->cache_zone; | |
935 | int block_num; | |
936 | ||
937 | if (ftl->cache_clean) | |
938 | return 0; | |
939 | ||
940 | if (ftl->unstable) | |
941 | return -EIO; | |
942 | ||
943 | BUG_ON(zone_num < 0); | |
944 | zone = &ftl->zones[zone_num]; | |
945 | block_num = zone->lba_to_phys_table[ftl->cache_block]; | |
946 | ||
947 | ||
948 | /* Try to read all unread areas of the cache block*/ | |
fed457a8 | 949 | for_each_set_bit(sector_num, &ftl->cache_data_invalid_bitmap, |
7d17c02a ML |
950 | ftl->block_size / SM_SECTOR_SIZE) { |
951 | ||
952 | if (!sm_read_sector(ftl, | |
953 | zone_num, block_num, sector_num * SM_SECTOR_SIZE, | |
954 | ftl->cache_data + sector_num * SM_SECTOR_SIZE, NULL)) | |
955 | clear_bit(sector_num, | |
956 | &ftl->cache_data_invalid_bitmap); | |
957 | } | |
958 | restart: | |
959 | ||
960 | if (ftl->unstable) | |
961 | return -EIO; | |
133fa8c7 ML |
962 | |
963 | /* If there are no spare blocks, */ | |
964 | /* we could still continue by erasing/writing the current block, | |
7d17c02a ML |
965 | but for such worn out media it doesn't worth the trouble, |
966 | and the dangers */ | |
133fa8c7 ML |
967 | if (kfifo_out(&zone->free_sectors, |
968 | (unsigned char *)&write_sector, 2) != 2) { | |
7d17c02a ML |
969 | dbg("no free sectors for write!"); |
970 | return -EIO; | |
971 | } | |
972 | ||
7d17c02a ML |
973 | |
974 | if (sm_write_block(ftl, ftl->cache_data, zone_num, write_sector, | |
975 | ftl->cache_block, ftl->cache_data_invalid_bitmap)) | |
976 | goto restart; | |
977 | ||
978 | /* Update the FTL table */ | |
979 | zone->lba_to_phys_table[ftl->cache_block] = write_sector; | |
980 | ||
981 | /* Write succesfull, so erase and free the old block */ | |
982 | if (block_num > 0) | |
983 | sm_erase_block(ftl, zone_num, block_num, 1); | |
984 | ||
985 | sm_cache_init(ftl); | |
986 | return 0; | |
987 | } | |
988 | ||
989 | ||
990 | /* flush timer, runs a second after last write */ | |
991 | static void sm_cache_flush_timer(unsigned long data) | |
992 | { | |
993 | struct sm_ftl *ftl = (struct sm_ftl *)data; | |
994 | queue_work(cache_flush_workqueue, &ftl->flush_work); | |
995 | } | |
996 | ||
997 | /* cache flush work, kicked by timer */ | |
998 | static void sm_cache_flush_work(struct work_struct *work) | |
999 | { | |
1000 | struct sm_ftl *ftl = container_of(work, struct sm_ftl, flush_work); | |
1001 | mutex_lock(&ftl->mutex); | |
1002 | sm_cache_flush(ftl); | |
1003 | mutex_unlock(&ftl->mutex); | |
1004 | return; | |
1005 | } | |
1006 | ||
1007 | /* ---------------- outside interface -------------------------------------- */ | |
1008 | ||
1009 | /* outside interface: read a sector */ | |
1010 | static int sm_read(struct mtd_blktrans_dev *dev, | |
1011 | unsigned long sect_no, char *buf) | |
1012 | { | |
1013 | struct sm_ftl *ftl = dev->priv; | |
1014 | struct ftl_zone *zone; | |
1015 | int error = 0, in_cache = 0; | |
1016 | int zone_num, block, boffset; | |
1017 | ||
1018 | sm_break_offset(ftl, sect_no << 9, &zone_num, &block, &boffset); | |
1019 | mutex_lock(&ftl->mutex); | |
1020 | ||
1021 | ||
1022 | zone = sm_get_zone(ftl, zone_num); | |
1023 | if (IS_ERR(zone)) { | |
1024 | error = PTR_ERR(zone); | |
1025 | goto unlock; | |
1026 | } | |
1027 | ||
1028 | /* Have to look at cache first */ | |
1029 | if (ftl->cache_zone == zone_num && ftl->cache_block == block) { | |
1030 | in_cache = 1; | |
1031 | if (!sm_cache_get(ftl, buf, boffset)) | |
1032 | goto unlock; | |
1033 | } | |
1034 | ||
1035 | /* Translate the block and return if doesn't exist in the table */ | |
1036 | block = zone->lba_to_phys_table[block]; | |
1037 | ||
1038 | if (block == -1) { | |
1039 | memset(buf, 0xFF, SM_SECTOR_SIZE); | |
1040 | goto unlock; | |
1041 | } | |
1042 | ||
1043 | if (sm_read_sector(ftl, zone_num, block, boffset, buf, NULL)) { | |
1044 | error = -EIO; | |
1045 | goto unlock; | |
1046 | } | |
1047 | ||
1048 | if (in_cache) | |
1049 | sm_cache_put(ftl, buf, boffset); | |
1050 | unlock: | |
1051 | mutex_unlock(&ftl->mutex); | |
1052 | return error; | |
1053 | } | |
1054 | ||
1055 | /* outside interface: write a sector */ | |
1056 | static int sm_write(struct mtd_blktrans_dev *dev, | |
1057 | unsigned long sec_no, char *buf) | |
1058 | { | |
1059 | struct sm_ftl *ftl = dev->priv; | |
1060 | struct ftl_zone *zone; | |
1061 | int error, zone_num, block, boffset; | |
1062 | ||
1063 | BUG_ON(ftl->readonly); | |
1064 | sm_break_offset(ftl, sec_no << 9, &zone_num, &block, &boffset); | |
1065 | ||
1066 | /* No need in flush thread running now */ | |
1067 | del_timer(&ftl->timer); | |
1068 | mutex_lock(&ftl->mutex); | |
1069 | ||
1070 | zone = sm_get_zone(ftl, zone_num); | |
1071 | if (IS_ERR(zone)) { | |
1072 | error = PTR_ERR(zone); | |
1073 | goto unlock; | |
1074 | } | |
1075 | ||
1076 | /* If entry is not in cache, flush it */ | |
1077 | if (ftl->cache_block != block || ftl->cache_zone != zone_num) { | |
1078 | ||
1079 | error = sm_cache_flush(ftl); | |
1080 | if (error) | |
1081 | goto unlock; | |
1082 | ||
1083 | ftl->cache_block = block; | |
1084 | ftl->cache_zone = zone_num; | |
1085 | } | |
1086 | ||
1087 | sm_cache_put(ftl, buf, boffset); | |
1088 | unlock: | |
1089 | mod_timer(&ftl->timer, jiffies + msecs_to_jiffies(cache_timeout)); | |
1090 | mutex_unlock(&ftl->mutex); | |
1091 | return error; | |
1092 | } | |
1093 | ||
1094 | /* outside interface: flush everything */ | |
1095 | static int sm_flush(struct mtd_blktrans_dev *dev) | |
1096 | { | |
1097 | struct sm_ftl *ftl = dev->priv; | |
1098 | int retval; | |
1099 | ||
1100 | mutex_lock(&ftl->mutex); | |
1101 | retval = sm_cache_flush(ftl); | |
1102 | mutex_unlock(&ftl->mutex); | |
1103 | return retval; | |
1104 | } | |
1105 | ||
1106 | /* outside interface: device is released */ | |
a8ca889e | 1107 | static void sm_release(struct mtd_blktrans_dev *dev) |
7d17c02a ML |
1108 | { |
1109 | struct sm_ftl *ftl = dev->priv; | |
1110 | ||
1111 | mutex_lock(&ftl->mutex); | |
1112 | del_timer_sync(&ftl->timer); | |
1113 | cancel_work_sync(&ftl->flush_work); | |
1114 | sm_cache_flush(ftl); | |
1115 | mutex_unlock(&ftl->mutex); | |
7d17c02a ML |
1116 | } |
1117 | ||
1118 | /* outside interface: get geometry */ | |
1119 | static int sm_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) | |
1120 | { | |
1121 | struct sm_ftl *ftl = dev->priv; | |
1122 | geo->heads = ftl->heads; | |
1123 | geo->sectors = ftl->sectors; | |
1124 | geo->cylinders = ftl->cylinders; | |
1125 | return 0; | |
1126 | } | |
1127 | ||
1128 | /* external interface: main initialization function */ | |
1129 | static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) | |
1130 | { | |
1131 | struct mtd_blktrans_dev *trans; | |
1132 | struct sm_ftl *ftl; | |
1133 | ||
1134 | /* Allocate & initialize our private structure */ | |
1135 | ftl = kzalloc(sizeof(struct sm_ftl), GFP_KERNEL); | |
1136 | if (!ftl) | |
1137 | goto error1; | |
1138 | ||
1139 | ||
1140 | mutex_init(&ftl->mutex); | |
1141 | setup_timer(&ftl->timer, sm_cache_flush_timer, (unsigned long)ftl); | |
1142 | INIT_WORK(&ftl->flush_work, sm_cache_flush_work); | |
1143 | init_completion(&ftl->erase_completion); | |
1144 | ||
1145 | /* Read media information */ | |
1146 | if (sm_get_media_info(ftl, mtd)) { | |
1147 | dbg("found unsupported mtd device, aborting"); | |
1148 | goto error2; | |
1149 | } | |
1150 | ||
1151 | ||
1152 | /* Allocate temporary CIS buffer for read retry support */ | |
1153 | ftl->cis_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL); | |
1154 | if (!ftl->cis_buffer) | |
1155 | goto error2; | |
1156 | ||
1157 | /* Allocate zone array, it will be initialized on demand */ | |
1158 | ftl->zones = kzalloc(sizeof(struct ftl_zone) * ftl->zone_count, | |
1159 | GFP_KERNEL); | |
1160 | if (!ftl->zones) | |
1161 | goto error3; | |
1162 | ||
1163 | /* Allocate the cache*/ | |
1164 | ftl->cache_data = kzalloc(ftl->block_size, GFP_KERNEL); | |
1165 | ||
1166 | if (!ftl->cache_data) | |
1167 | goto error4; | |
1168 | ||
1169 | sm_cache_init(ftl); | |
1170 | ||
1171 | ||
1172 | /* Allocate upper layer structure and initialize it */ | |
1173 | trans = kzalloc(sizeof(struct mtd_blktrans_dev), GFP_KERNEL); | |
1174 | if (!trans) | |
1175 | goto error5; | |
1176 | ||
1177 | ftl->trans = trans; | |
1178 | trans->priv = ftl; | |
1179 | ||
1180 | trans->tr = tr; | |
1181 | trans->mtd = mtd; | |
1182 | trans->devnum = -1; | |
1183 | trans->size = (ftl->block_size * ftl->max_lba * ftl->zone_count) >> 9; | |
1184 | trans->readonly = ftl->readonly; | |
1185 | ||
1186 | if (sm_find_cis(ftl)) { | |
1187 | dbg("CIS not found on mtd device, aborting"); | |
1188 | goto error6; | |
1189 | } | |
1190 | ||
1191 | ftl->disk_attributes = sm_create_sysfs_attributes(ftl); | |
629286b9 XW |
1192 | if (!ftl->disk_attributes) |
1193 | goto error6; | |
7d17c02a ML |
1194 | trans->disk_attributes = ftl->disk_attributes; |
1195 | ||
1196 | sm_printk("Found %d MiB xD/SmartMedia FTL on mtd%d", | |
1197 | (int)(mtd->size / (1024 * 1024)), mtd->index); | |
1198 | ||
1199 | dbg("FTL layout:"); | |
1200 | dbg("%d zone(s), each consists of %d blocks (+%d spares)", | |
1201 | ftl->zone_count, ftl->max_lba, | |
1202 | ftl->zone_size - ftl->max_lba); | |
1203 | dbg("each block consists of %d bytes", | |
1204 | ftl->block_size); | |
1205 | ||
1206 | ||
1207 | /* Register device*/ | |
1208 | if (add_mtd_blktrans_dev(trans)) { | |
1209 | dbg("error in mtdblktrans layer"); | |
1210 | goto error6; | |
1211 | } | |
1212 | return; | |
1213 | error6: | |
1214 | kfree(trans); | |
1215 | error5: | |
1216 | kfree(ftl->cache_data); | |
1217 | error4: | |
1218 | kfree(ftl->zones); | |
1219 | error3: | |
1220 | kfree(ftl->cis_buffer); | |
1221 | error2: | |
1222 | kfree(ftl); | |
1223 | error1: | |
1224 | return; | |
1225 | } | |
1226 | ||
1227 | /* main interface: device {surprise,} removal */ | |
1228 | static void sm_remove_dev(struct mtd_blktrans_dev *dev) | |
1229 | { | |
1230 | struct sm_ftl *ftl = dev->priv; | |
1231 | int i; | |
1232 | ||
1233 | del_mtd_blktrans_dev(dev); | |
1234 | ftl->trans = NULL; | |
1235 | ||
1236 | for (i = 0 ; i < ftl->zone_count; i++) { | |
1237 | ||
1238 | if (!ftl->zones[i].initialized) | |
1239 | continue; | |
1240 | ||
1241 | kfree(ftl->zones[i].lba_to_phys_table); | |
1242 | kfifo_free(&ftl->zones[i].free_sectors); | |
1243 | } | |
1244 | ||
1245 | sm_delete_sysfs_attributes(ftl); | |
1246 | kfree(ftl->cis_buffer); | |
1247 | kfree(ftl->zones); | |
1248 | kfree(ftl->cache_data); | |
1249 | kfree(ftl); | |
1250 | } | |
1251 | ||
1252 | static struct mtd_blktrans_ops sm_ftl_ops = { | |
1253 | .name = "smblk", | |
452380ef | 1254 | .major = 0, |
7d17c02a ML |
1255 | .part_bits = SM_FTL_PARTN_BITS, |
1256 | .blksize = SM_SECTOR_SIZE, | |
1257 | .getgeo = sm_getgeo, | |
1258 | ||
1259 | .add_mtd = sm_add_mtd, | |
1260 | .remove_dev = sm_remove_dev, | |
1261 | ||
1262 | .readsect = sm_read, | |
1263 | .writesect = sm_write, | |
1264 | ||
1265 | .flush = sm_flush, | |
1266 | .release = sm_release, | |
1267 | ||
1268 | .owner = THIS_MODULE, | |
1269 | }; | |
1270 | ||
1271 | static __init int sm_module_init(void) | |
1272 | { | |
1273 | int error = 0; | |
58a69cb4 | 1274 | cache_flush_workqueue = create_freezable_workqueue("smflush"); |
7d17c02a ML |
1275 | |
1276 | if (IS_ERR(cache_flush_workqueue)) | |
1277 | return PTR_ERR(cache_flush_workqueue); | |
1278 | ||
1279 | error = register_mtd_blktrans(&sm_ftl_ops); | |
1280 | if (error) | |
1281 | destroy_workqueue(cache_flush_workqueue); | |
1282 | return error; | |
1283 | ||
1284 | } | |
1285 | ||
1286 | static void __exit sm_module_exit(void) | |
1287 | { | |
1288 | destroy_workqueue(cache_flush_workqueue); | |
1289 | deregister_mtd_blktrans(&sm_ftl_ops); | |
1290 | } | |
1291 | ||
1292 | module_init(sm_module_init); | |
1293 | module_exit(sm_module_exit); | |
1294 | ||
1295 | MODULE_LICENSE("GPL"); | |
1296 | MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); | |
1297 | MODULE_DESCRIPTION("Smartmedia/xD mtd translation layer"); |