Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7d17c02a ML |
2 | /* |
3 | * Copyright © 2009 - Maxim Levitsky | |
4 | * SmartMedia/xD translation layer | |
7d17c02a ML |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/random.h> | |
10 | #include <linux/hdreg.h> | |
11 | #include <linux/kthread.h> | |
12 | #include <linux/freezer.h> | |
13 | #include <linux/sysfs.h> | |
14 | #include <linux/bitops.h> | |
8da552f2 | 15 | #include <linux/slab.h> |
01de69c2 | 16 | #include <linux/mtd/nand_ecc.h> |
93db446a | 17 | #include "nand/raw/sm_common.h" |
7d17c02a ML |
18 | #include "sm_ftl.h" |
19 | ||
7d17c02a ML |
20 | |
21 | ||
582b2ffc | 22 | static struct workqueue_struct *cache_flush_workqueue; |
7d17c02a ML |
23 | |
24 | static int cache_timeout = 1000; | |
f9fbcdc3 | 25 | module_param(cache_timeout, int, S_IRUGO); |
7d17c02a ML |
26 | MODULE_PARM_DESC(cache_timeout, |
27 | "Timeout (in ms) for cache flush (1000 ms default"); | |
28 | ||
29 | static int debug; | |
30 | module_param(debug, int, S_IRUGO | S_IWUSR); | |
31 | MODULE_PARM_DESC(debug, "Debug level (0-2)"); | |
32 | ||
33 | ||
92394b5c | 34 | /* ------------------- sysfs attributes ---------------------------------- */ |
7d17c02a ML |
35 | struct sm_sysfs_attribute { |
36 | struct device_attribute dev_attr; | |
37 | char *data; | |
38 | int len; | |
39 | }; | |
40 | ||
582b2ffc | 41 | static ssize_t sm_attr_show(struct device *dev, struct device_attribute *attr, |
7d17c02a ML |
42 | char *buf) |
43 | { | |
44 | struct sm_sysfs_attribute *sm_attr = | |
45 | container_of(attr, struct sm_sysfs_attribute, dev_attr); | |
46 | ||
47 | strncpy(buf, sm_attr->data, sm_attr->len); | |
48 | return sm_attr->len; | |
49 | } | |
50 | ||
51 | ||
52 | #define NUM_ATTRIBUTES 1 | |
53 | #define SM_CIS_VENDOR_OFFSET 0x59 | |
582b2ffc | 54 | static struct attribute_group *sm_create_sysfs_attributes(struct sm_ftl *ftl) |
7d17c02a ML |
55 | { |
56 | struct attribute_group *attr_group; | |
57 | struct attribute **attributes; | |
58 | struct sm_sysfs_attribute *vendor_attribute; | |
b4c23305 | 59 | char *vendor; |
7d17c02a | 60 | |
b4c23305 DC |
61 | vendor = kstrndup(ftl->cis_buffer + SM_CIS_VENDOR_OFFSET, |
62 | SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET, GFP_KERNEL); | |
629286b9 XW |
63 | if (!vendor) |
64 | goto error1; | |
7d17c02a ML |
65 | |
66 | /* Initialize sysfs attributes */ | |
67 | vendor_attribute = | |
68 | kzalloc(sizeof(struct sm_sysfs_attribute), GFP_KERNEL); | |
629286b9 XW |
69 | if (!vendor_attribute) |
70 | goto error2; | |
7d17c02a | 71 | |
ca7081d9 ML |
72 | sysfs_attr_init(&vendor_attribute->dev_attr.attr); |
73 | ||
7d17c02a | 74 | vendor_attribute->data = vendor; |
b4c23305 | 75 | vendor_attribute->len = strlen(vendor); |
7d17c02a ML |
76 | vendor_attribute->dev_attr.attr.name = "vendor"; |
77 | vendor_attribute->dev_attr.attr.mode = S_IRUGO; | |
78 | vendor_attribute->dev_attr.show = sm_attr_show; | |
79 | ||
80 | ||
81 | /* Create array of pointers to the attributes */ | |
6396bb22 | 82 | attributes = kcalloc(NUM_ATTRIBUTES + 1, sizeof(struct attribute *), |
7d17c02a | 83 | GFP_KERNEL); |
629286b9 XW |
84 | if (!attributes) |
85 | goto error3; | |
7d17c02a ML |
86 | attributes[0] = &vendor_attribute->dev_attr.attr; |
87 | ||
88 | /* Finally create the attribute group */ | |
89 | attr_group = kzalloc(sizeof(struct attribute_group), GFP_KERNEL); | |
629286b9 XW |
90 | if (!attr_group) |
91 | goto error4; | |
7d17c02a ML |
92 | attr_group->attrs = attributes; |
93 | return attr_group; | |
629286b9 XW |
94 | error4: |
95 | kfree(attributes); | |
96 | error3: | |
97 | kfree(vendor_attribute); | |
98 | error2: | |
99 | kfree(vendor); | |
100 | error1: | |
101 | return NULL; | |
7d17c02a ML |
102 | } |
103 | ||
582b2ffc | 104 | static void sm_delete_sysfs_attributes(struct sm_ftl *ftl) |
7d17c02a ML |
105 | { |
106 | struct attribute **attributes = ftl->disk_attributes->attrs; | |
107 | int i; | |
108 | ||
109 | for (i = 0; attributes[i] ; i++) { | |
110 | ||
111 | struct device_attribute *dev_attr = container_of(attributes[i], | |
112 | struct device_attribute, attr); | |
113 | ||
114 | struct sm_sysfs_attribute *sm_attr = | |
115 | container_of(dev_attr, | |
116 | struct sm_sysfs_attribute, dev_attr); | |
117 | ||
118 | kfree(sm_attr->data); | |
119 | kfree(sm_attr); | |
120 | } | |
121 | ||
122 | kfree(ftl->disk_attributes->attrs); | |
123 | kfree(ftl->disk_attributes); | |
124 | } | |
125 | ||
126 | ||
127 | /* ----------------------- oob helpers -------------------------------------- */ | |
128 | ||
129 | static int sm_get_lba(uint8_t *lba) | |
130 | { | |
131 | /* check fixed bits */ | |
132 | if ((lba[0] & 0xF8) != 0x10) | |
133 | return -2; | |
134 | ||
7854d3f7 | 135 | /* check parity - endianness doesn't matter */ |
7d17c02a ML |
136 | if (hweight16(*(uint16_t *)lba) & 1) |
137 | return -2; | |
138 | ||
139 | return (lba[1] >> 1) | ((lba[0] & 0x07) << 7); | |
140 | } | |
141 | ||
142 | ||
143 | /* | |
92394b5c | 144 | * Read LBA associated with block |
7d17c02a ML |
145 | * returns -1, if block is erased |
146 | * returns -2 if error happens | |
147 | */ | |
148 | static int sm_read_lba(struct sm_oob *oob) | |
149 | { | |
150 | static const uint32_t erased_pattern[4] = { | |
151 | 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; | |
152 | ||
153 | uint16_t lba_test; | |
154 | int lba; | |
155 | ||
156 | /* First test for erased block */ | |
157 | if (!memcmp(oob, erased_pattern, SM_OOB_SIZE)) | |
158 | return -1; | |
159 | ||
160 | /* Now check is both copies of the LBA differ too much */ | |
161 | lba_test = *(uint16_t *)oob->lba_copy1 ^ *(uint16_t*)oob->lba_copy2; | |
162 | if (lba_test && !is_power_of_2(lba_test)) | |
163 | return -2; | |
164 | ||
165 | /* And read it */ | |
166 | lba = sm_get_lba(oob->lba_copy1); | |
167 | ||
168 | if (lba == -2) | |
169 | lba = sm_get_lba(oob->lba_copy2); | |
170 | ||
171 | return lba; | |
172 | } | |
173 | ||
174 | static void sm_write_lba(struct sm_oob *oob, uint16_t lba) | |
175 | { | |
176 | uint8_t tmp[2]; | |
177 | ||
178 | WARN_ON(lba >= 1000); | |
179 | ||
180 | tmp[0] = 0x10 | ((lba >> 7) & 0x07); | |
181 | tmp[1] = (lba << 1) & 0xFF; | |
182 | ||
183 | if (hweight16(*(uint16_t *)tmp) & 0x01) | |
184 | tmp[1] |= 1; | |
185 | ||
186 | oob->lba_copy1[0] = oob->lba_copy2[0] = tmp[0]; | |
187 | oob->lba_copy1[1] = oob->lba_copy2[1] = tmp[1]; | |
188 | } | |
189 | ||
190 | ||
191 | /* Make offset from parts */ | |
192 | static loff_t sm_mkoffset(struct sm_ftl *ftl, int zone, int block, int boffset) | |
193 | { | |
194 | WARN_ON(boffset & (SM_SECTOR_SIZE - 1)); | |
195 | WARN_ON(zone < 0 || zone >= ftl->zone_count); | |
196 | WARN_ON(block >= ftl->zone_size); | |
197 | WARN_ON(boffset >= ftl->block_size); | |
198 | ||
199 | if (block == -1) | |
200 | return -1; | |
201 | ||
202 | return (zone * SM_MAX_ZONE_SIZE + block) * ftl->block_size + boffset; | |
203 | } | |
204 | ||
205 | /* Breaks offset into parts */ | |
2b2462d5 | 206 | static void sm_break_offset(struct sm_ftl *ftl, loff_t loffset, |
7d17c02a ML |
207 | int *zone, int *block, int *boffset) |
208 | { | |
2b2462d5 | 209 | u64 offset = loffset; |
7d17c02a ML |
210 | *boffset = do_div(offset, ftl->block_size); |
211 | *block = do_div(offset, ftl->max_lba); | |
212 | *zone = offset >= ftl->zone_count ? -1 : offset; | |
213 | } | |
214 | ||
215 | /* ---------------------- low level IO ------------------------------------- */ | |
216 | ||
217 | static int sm_correct_sector(uint8_t *buffer, struct sm_oob *oob) | |
218 | { | |
7d17c02a ML |
219 | uint8_t ecc[3]; |
220 | ||
309600c1 | 221 | __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc, |
9bb94643 | 222 | IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC)); |
309600c1 | 223 | if (__nand_correct_data(buffer, ecc, oob->ecc1, SM_SMALL_PAGE, |
9bb94643 | 224 | IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC)) < 0) |
7d17c02a ML |
225 | return -EIO; |
226 | ||
227 | buffer += SM_SMALL_PAGE; | |
228 | ||
309600c1 | 229 | __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc, |
9bb94643 | 230 | IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC)); |
309600c1 | 231 | if (__nand_correct_data(buffer, ecc, oob->ecc2, SM_SMALL_PAGE, |
9bb94643 | 232 | IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC)) < 0) |
7d17c02a | 233 | return -EIO; |
7d17c02a ML |
234 | return 0; |
235 | } | |
236 | ||
237 | /* Reads a sector + oob*/ | |
238 | static int sm_read_sector(struct sm_ftl *ftl, | |
239 | int zone, int block, int boffset, | |
240 | uint8_t *buffer, struct sm_oob *oob) | |
241 | { | |
242 | struct mtd_info *mtd = ftl->trans->mtd; | |
243 | struct mtd_oob_ops ops; | |
244 | struct sm_oob tmp_oob; | |
133fa8c7 | 245 | int ret = -EIO; |
7d17c02a ML |
246 | int try = 0; |
247 | ||
248 | /* FTL can contain -1 entries that are by default filled with bits */ | |
249 | if (block == -1) { | |
250 | memset(buffer, 0xFF, SM_SECTOR_SIZE); | |
251 | return 0; | |
252 | } | |
253 | ||
92394b5c | 254 | /* User might not need the oob, but we do for data verification */ |
7d17c02a ML |
255 | if (!oob) |
256 | oob = &tmp_oob; | |
257 | ||
0612b9dd | 258 | ops.mode = ftl->smallpagenand ? MTD_OPS_RAW : MTD_OPS_PLACE_OOB; |
7d17c02a ML |
259 | ops.ooboffs = 0; |
260 | ops.ooblen = SM_OOB_SIZE; | |
261 | ops.oobbuf = (void *)oob; | |
262 | ops.len = SM_SECTOR_SIZE; | |
263 | ops.datbuf = buffer; | |
264 | ||
265 | again: | |
266 | if (try++) { | |
267 | /* Avoid infinite recursion on CIS reads, sm_recheck_media | |
268 | won't help anyway */ | |
269 | if (zone == 0 && block == ftl->cis_block && boffset == | |
270 | ftl->cis_boffset) | |
271 | return ret; | |
272 | ||
273 | /* Test if media is stable */ | |
274 | if (try == 3 || sm_recheck_media(ftl)) | |
275 | return ret; | |
276 | } | |
277 | ||
92394b5c | 278 | /* Unfortunately, oob read will _always_ succeed, |
7d17c02a | 279 | despite card removal..... */ |
fd2819bb | 280 | ret = mtd_read_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops); |
7d17c02a ML |
281 | |
282 | /* Test for unknown errors */ | |
d57f4054 | 283 | if (ret != 0 && !mtd_is_bitflip_or_eccerr(ret)) { |
7d17c02a ML |
284 | dbg("read of block %d at zone %d, failed due to error (%d)", |
285 | block, zone, ret); | |
286 | goto again; | |
287 | } | |
288 | ||
289 | /* Do a basic test on the oob, to guard against returned garbage */ | |
290 | if (oob->reserved != 0xFFFFFFFF && !is_power_of_2(~oob->reserved)) | |
291 | goto again; | |
292 | ||
293 | /* This should never happen, unless there is a bug in the mtd driver */ | |
294 | WARN_ON(ops.oobretlen != SM_OOB_SIZE); | |
295 | WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE); | |
296 | ||
297 | if (!buffer) | |
298 | return 0; | |
299 | ||
300 | /* Test if sector marked as bad */ | |
301 | if (!sm_sector_valid(oob)) { | |
302 | dbg("read of block %d at zone %d, failed because it is marked" | |
303 | " as bad" , block, zone); | |
304 | goto again; | |
305 | } | |
306 | ||
307 | /* Test ECC*/ | |
d57f4054 | 308 | if (mtd_is_eccerr(ret) || |
7d17c02a ML |
309 | (ftl->smallpagenand && sm_correct_sector(buffer, oob))) { |
310 | ||
311 | dbg("read of block %d at zone %d, failed due to ECC error", | |
312 | block, zone); | |
313 | goto again; | |
314 | } | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | /* Writes a sector to media */ | |
320 | static int sm_write_sector(struct sm_ftl *ftl, | |
321 | int zone, int block, int boffset, | |
322 | uint8_t *buffer, struct sm_oob *oob) | |
323 | { | |
324 | struct mtd_oob_ops ops; | |
325 | struct mtd_info *mtd = ftl->trans->mtd; | |
326 | int ret; | |
327 | ||
328 | BUG_ON(ftl->readonly); | |
329 | ||
330 | if (zone == 0 && (block == ftl->cis_block || block == 0)) { | |
331 | dbg("attempted to write the CIS!"); | |
332 | return -EIO; | |
333 | } | |
334 | ||
335 | if (ftl->unstable) | |
336 | return -EIO; | |
337 | ||
0612b9dd | 338 | ops.mode = ftl->smallpagenand ? MTD_OPS_RAW : MTD_OPS_PLACE_OOB; |
7d17c02a ML |
339 | ops.len = SM_SECTOR_SIZE; |
340 | ops.datbuf = buffer; | |
341 | ops.ooboffs = 0; | |
342 | ops.ooblen = SM_OOB_SIZE; | |
343 | ops.oobbuf = (void *)oob; | |
344 | ||
a2cc5ba0 | 345 | ret = mtd_write_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops); |
7d17c02a ML |
346 | |
347 | /* Now we assume that hardware will catch write bitflip errors */ | |
7d17c02a ML |
348 | |
349 | if (ret) { | |
350 | dbg("write to block %d at zone %d, failed with error %d", | |
351 | block, zone, ret); | |
352 | ||
353 | sm_recheck_media(ftl); | |
354 | return ret; | |
355 | } | |
356 | ||
357 | /* This should never happen, unless there is a bug in the driver */ | |
358 | WARN_ON(ops.oobretlen != SM_OOB_SIZE); | |
359 | WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE); | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | /* ------------------------ block IO ------------------------------------- */ | |
365 | ||
366 | /* Write a block using data and lba, and invalid sector bitmap */ | |
367 | static int sm_write_block(struct sm_ftl *ftl, uint8_t *buf, | |
368 | int zone, int block, int lba, | |
369 | unsigned long invalid_bitmap) | |
370 | { | |
371 | struct sm_oob oob; | |
372 | int boffset; | |
373 | int retry = 0; | |
374 | ||
375 | /* Initialize the oob with requested values */ | |
376 | memset(&oob, 0xFF, SM_OOB_SIZE); | |
377 | sm_write_lba(&oob, lba); | |
378 | restart: | |
379 | if (ftl->unstable) | |
380 | return -EIO; | |
381 | ||
382 | for (boffset = 0; boffset < ftl->block_size; | |
383 | boffset += SM_SECTOR_SIZE) { | |
384 | ||
385 | oob.data_status = 0xFF; | |
386 | ||
387 | if (test_bit(boffset / SM_SECTOR_SIZE, &invalid_bitmap)) { | |
388 | ||
389 | sm_printk("sector %d of block at LBA %d of zone %d" | |
c19ca6cb | 390 | " couldn't be read, marking it as invalid", |
7d17c02a ML |
391 | boffset / SM_SECTOR_SIZE, lba, zone); |
392 | ||
393 | oob.data_status = 0; | |
394 | } | |
395 | ||
7d17c02a | 396 | if (ftl->smallpagenand) { |
309600c1 BB |
397 | __nand_calculate_ecc(buf + boffset, SM_SMALL_PAGE, |
398 | oob.ecc1, | |
9bb94643 | 399 | IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC)); |
7d17c02a ML |
400 | |
401 | __nand_calculate_ecc(buf + boffset + SM_SMALL_PAGE, | |
309600c1 | 402 | SM_SMALL_PAGE, oob.ecc2, |
9bb94643 | 403 | IS_ENABLED(CONFIG_MTD_NAND_ECC_SW_HAMMING_SMC)); |
7d17c02a | 404 | } |
7d17c02a ML |
405 | if (!sm_write_sector(ftl, zone, block, boffset, |
406 | buf + boffset, &oob)) | |
407 | continue; | |
408 | ||
409 | if (!retry) { | |
410 | ||
411 | /* If write fails. try to erase the block */ | |
412 | /* This is safe, because we never write in blocks | |
413 | that contain valuable data. | |
414 | This is intended to repair block that are marked | |
415 | as erased, but that isn't fully erased*/ | |
416 | ||
417 | if (sm_erase_block(ftl, zone, block, 0)) | |
418 | return -EIO; | |
419 | ||
420 | retry = 1; | |
421 | goto restart; | |
422 | } else { | |
423 | sm_mark_block_bad(ftl, zone, block); | |
424 | return -EIO; | |
425 | } | |
426 | } | |
427 | return 0; | |
428 | } | |
429 | ||
430 | ||
431 | /* Mark whole block at offset 'offs' as bad. */ | |
432 | static void sm_mark_block_bad(struct sm_ftl *ftl, int zone, int block) | |
433 | { | |
434 | struct sm_oob oob; | |
435 | int boffset; | |
436 | ||
437 | memset(&oob, 0xFF, SM_OOB_SIZE); | |
438 | oob.block_status = 0xF0; | |
439 | ||
440 | if (ftl->unstable) | |
441 | return; | |
442 | ||
443 | if (sm_recheck_media(ftl)) | |
444 | return; | |
445 | ||
446 | sm_printk("marking block %d of zone %d as bad", block, zone); | |
447 | ||
448 | /* We aren't checking the return value, because we don't care */ | |
449 | /* This also fails on fake xD cards, but I guess these won't expose | |
92394b5c | 450 | any bad blocks till fail completely */ |
7d17c02a ML |
451 | for (boffset = 0; boffset < ftl->block_size; boffset += SM_SECTOR_SIZE) |
452 | sm_write_sector(ftl, zone, block, boffset, NULL, &oob); | |
453 | } | |
454 | ||
455 | /* | |
456 | * Erase a block within a zone | |
92394b5c | 457 | * If erase succeeds, it updates free block fifo, otherwise marks block as bad |
7d17c02a ML |
458 | */ |
459 | static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block, | |
460 | int put_free) | |
461 | { | |
462 | struct ftl_zone *zone = &ftl->zones[zone_num]; | |
463 | struct mtd_info *mtd = ftl->trans->mtd; | |
464 | struct erase_info erase; | |
465 | ||
7d17c02a ML |
466 | erase.addr = sm_mkoffset(ftl, zone_num, block, 0); |
467 | erase.len = ftl->block_size; | |
7d17c02a ML |
468 | |
469 | if (ftl->unstable) | |
470 | return -EIO; | |
471 | ||
472 | BUG_ON(ftl->readonly); | |
473 | ||
474 | if (zone_num == 0 && (block == ftl->cis_block || block == 0)) { | |
475 | sm_printk("attempted to erase the CIS!"); | |
476 | return -EIO; | |
477 | } | |
478 | ||
7e1f0dc0 | 479 | if (mtd_erase(mtd, &erase)) { |
7d17c02a ML |
480 | sm_printk("erase of block %d in zone %d failed", |
481 | block, zone_num); | |
482 | goto error; | |
483 | } | |
484 | ||
7d17c02a ML |
485 | if (put_free) |
486 | kfifo_in(&zone->free_sectors, | |
487 | (const unsigned char *)&block, sizeof(block)); | |
488 | ||
489 | return 0; | |
490 | error: | |
491 | sm_mark_block_bad(ftl, zone_num, block); | |
492 | return -EIO; | |
493 | } | |
494 | ||
92394b5c | 495 | /* Thoroughly test that block is valid. */ |
7d17c02a ML |
496 | static int sm_check_block(struct sm_ftl *ftl, int zone, int block) |
497 | { | |
498 | int boffset; | |
499 | struct sm_oob oob; | |
500 | int lbas[] = { -3, 0, 0, 0 }; | |
501 | int i = 0; | |
502 | int test_lba; | |
503 | ||
504 | ||
505 | /* First just check that block doesn't look fishy */ | |
506 | /* Only blocks that are valid or are sliced in two parts, are | |
507 | accepted */ | |
508 | for (boffset = 0; boffset < ftl->block_size; | |
509 | boffset += SM_SECTOR_SIZE) { | |
510 | ||
92394b5c | 511 | /* This shouldn't happen anyway */ |
7d17c02a ML |
512 | if (sm_read_sector(ftl, zone, block, boffset, NULL, &oob)) |
513 | return -2; | |
514 | ||
515 | test_lba = sm_read_lba(&oob); | |
516 | ||
517 | if (lbas[i] != test_lba) | |
518 | lbas[++i] = test_lba; | |
519 | ||
520 | /* If we found three different LBAs, something is fishy */ | |
521 | if (i == 3) | |
522 | return -EIO; | |
523 | } | |
524 | ||
25985edc | 525 | /* If the block is sliced (partially erased usually) erase it */ |
7d17c02a ML |
526 | if (i == 2) { |
527 | sm_erase_block(ftl, zone, block, 1); | |
528 | return 1; | |
529 | } | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | /* ----------------- media scanning --------------------------------- */ | |
535 | static const struct chs_entry chs_table[] = { | |
536 | { 1, 125, 4, 4 }, | |
537 | { 2, 125, 4, 8 }, | |
538 | { 4, 250, 4, 8 }, | |
539 | { 8, 250, 4, 16 }, | |
540 | { 16, 500, 4, 16 }, | |
541 | { 32, 500, 8, 16 }, | |
542 | { 64, 500, 8, 32 }, | |
543 | { 128, 500, 16, 32 }, | |
544 | { 256, 1000, 16, 32 }, | |
545 | { 512, 1015, 32, 63 }, | |
546 | { 1024, 985, 33, 63 }, | |
547 | { 2048, 985, 33, 63 }, | |
548 | { 0 }, | |
549 | }; | |
550 | ||
551 | ||
552 | static const uint8_t cis_signature[] = { | |
553 | 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 | |
554 | }; | |
555 | /* Find out media parameters. | |
556 | * This ideally has to be based on nand id, but for now device size is enough */ | |
582b2ffc | 557 | static int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd) |
7d17c02a ML |
558 | { |
559 | int i; | |
560 | int size_in_megs = mtd->size / (1024 * 1024); | |
561 | ||
562 | ftl->readonly = mtd->type == MTD_ROM; | |
563 | ||
564 | /* Manual settings for very old devices */ | |
565 | ftl->zone_count = 1; | |
566 | ftl->smallpagenand = 0; | |
567 | ||
568 | switch (size_in_megs) { | |
569 | case 1: | |
570 | /* 1 MiB flash/rom SmartMedia card (256 byte pages)*/ | |
571 | ftl->zone_size = 256; | |
572 | ftl->max_lba = 250; | |
573 | ftl->block_size = 8 * SM_SECTOR_SIZE; | |
574 | ftl->smallpagenand = 1; | |
575 | ||
576 | break; | |
577 | case 2: | |
578 | /* 2 MiB flash SmartMedia (256 byte pages)*/ | |
579 | if (mtd->writesize == SM_SMALL_PAGE) { | |
580 | ftl->zone_size = 512; | |
581 | ftl->max_lba = 500; | |
582 | ftl->block_size = 8 * SM_SECTOR_SIZE; | |
583 | ftl->smallpagenand = 1; | |
584 | /* 2 MiB rom SmartMedia */ | |
585 | } else { | |
586 | ||
587 | if (!ftl->readonly) | |
588 | return -ENODEV; | |
589 | ||
590 | ftl->zone_size = 256; | |
591 | ftl->max_lba = 250; | |
592 | ftl->block_size = 16 * SM_SECTOR_SIZE; | |
593 | } | |
594 | break; | |
595 | case 4: | |
596 | /* 4 MiB flash/rom SmartMedia device */ | |
597 | ftl->zone_size = 512; | |
598 | ftl->max_lba = 500; | |
599 | ftl->block_size = 16 * SM_SECTOR_SIZE; | |
600 | break; | |
601 | case 8: | |
602 | /* 8 MiB flash/rom SmartMedia device */ | |
603 | ftl->zone_size = 1024; | |
604 | ftl->max_lba = 1000; | |
605 | ftl->block_size = 16 * SM_SECTOR_SIZE; | |
606 | } | |
607 | ||
608 | /* Minimum xD size is 16MiB. Also, all xD cards have standard zone | |
609 | sizes. SmartMedia cards exist up to 128 MiB and have same layout*/ | |
610 | if (size_in_megs >= 16) { | |
611 | ftl->zone_count = size_in_megs / 16; | |
612 | ftl->zone_size = 1024; | |
613 | ftl->max_lba = 1000; | |
614 | ftl->block_size = 32 * SM_SECTOR_SIZE; | |
615 | } | |
616 | ||
617 | /* Test for proper write,erase and oob sizes */ | |
618 | if (mtd->erasesize > ftl->block_size) | |
619 | return -ENODEV; | |
620 | ||
621 | if (mtd->writesize > SM_SECTOR_SIZE) | |
622 | return -ENODEV; | |
623 | ||
624 | if (ftl->smallpagenand && mtd->oobsize < SM_SMALL_OOB_SIZE) | |
625 | return -ENODEV; | |
626 | ||
627 | if (!ftl->smallpagenand && mtd->oobsize < SM_OOB_SIZE) | |
628 | return -ENODEV; | |
629 | ||
fc002e3c AB |
630 | /* We use OOB */ |
631 | if (!mtd_has_oob(mtd)) | |
7d17c02a ML |
632 | return -ENODEV; |
633 | ||
634 | /* Find geometry information */ | |
635 | for (i = 0 ; i < ARRAY_SIZE(chs_table) ; i++) { | |
636 | if (chs_table[i].size == size_in_megs) { | |
637 | ftl->cylinders = chs_table[i].cyl; | |
638 | ftl->heads = chs_table[i].head; | |
639 | ftl->sectors = chs_table[i].sec; | |
640 | return 0; | |
641 | } | |
642 | } | |
643 | ||
644 | sm_printk("media has unknown size : %dMiB", size_in_megs); | |
645 | ftl->cylinders = 985; | |
646 | ftl->heads = 33; | |
647 | ftl->sectors = 63; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | /* Validate the CIS */ | |
652 | static int sm_read_cis(struct sm_ftl *ftl) | |
653 | { | |
654 | struct sm_oob oob; | |
655 | ||
656 | if (sm_read_sector(ftl, | |
657 | 0, ftl->cis_block, ftl->cis_boffset, ftl->cis_buffer, &oob)) | |
658 | return -EIO; | |
659 | ||
660 | if (!sm_sector_valid(&oob) || !sm_block_valid(&oob)) | |
661 | return -EIO; | |
662 | ||
663 | if (!memcmp(ftl->cis_buffer + ftl->cis_page_offset, | |
664 | cis_signature, sizeof(cis_signature))) { | |
665 | return 0; | |
666 | } | |
667 | ||
668 | return -EIO; | |
669 | } | |
670 | ||
671 | /* Scan the media for the CIS */ | |
672 | static int sm_find_cis(struct sm_ftl *ftl) | |
673 | { | |
674 | struct sm_oob oob; | |
675 | int block, boffset; | |
676 | int block_found = 0; | |
677 | int cis_found = 0; | |
678 | ||
679 | /* Search for first valid block */ | |
680 | for (block = 0 ; block < ftl->zone_size - ftl->max_lba ; block++) { | |
681 | ||
682 | if (sm_read_sector(ftl, 0, block, 0, NULL, &oob)) | |
683 | continue; | |
684 | ||
685 | if (!sm_block_valid(&oob)) | |
686 | continue; | |
687 | block_found = 1; | |
688 | break; | |
689 | } | |
690 | ||
691 | if (!block_found) | |
692 | return -EIO; | |
693 | ||
694 | /* Search for first valid sector in this block */ | |
695 | for (boffset = 0 ; boffset < ftl->block_size; | |
696 | boffset += SM_SECTOR_SIZE) { | |
697 | ||
698 | if (sm_read_sector(ftl, 0, block, boffset, NULL, &oob)) | |
699 | continue; | |
700 | ||
701 | if (!sm_sector_valid(&oob)) | |
702 | continue; | |
703 | break; | |
704 | } | |
705 | ||
706 | if (boffset == ftl->block_size) | |
707 | return -EIO; | |
708 | ||
709 | ftl->cis_block = block; | |
710 | ftl->cis_boffset = boffset; | |
711 | ftl->cis_page_offset = 0; | |
712 | ||
713 | cis_found = !sm_read_cis(ftl); | |
714 | ||
715 | if (!cis_found) { | |
716 | ftl->cis_page_offset = SM_SMALL_PAGE; | |
717 | cis_found = !sm_read_cis(ftl); | |
718 | } | |
719 | ||
720 | if (cis_found) { | |
721 | dbg("CIS block found at offset %x", | |
722 | block * ftl->block_size + | |
723 | boffset + ftl->cis_page_offset); | |
724 | return 0; | |
725 | } | |
726 | return -EIO; | |
727 | } | |
728 | ||
729 | /* Basic test to determine if underlying mtd device if functional */ | |
730 | static int sm_recheck_media(struct sm_ftl *ftl) | |
731 | { | |
732 | if (sm_read_cis(ftl)) { | |
733 | ||
734 | if (!ftl->unstable) { | |
735 | sm_printk("media unstable, not allowing writes"); | |
736 | ftl->unstable = 1; | |
737 | } | |
738 | return -EIO; | |
739 | } | |
740 | return 0; | |
741 | } | |
742 | ||
743 | /* Initialize a FTL zone */ | |
744 | static int sm_init_zone(struct sm_ftl *ftl, int zone_num) | |
745 | { | |
746 | struct ftl_zone *zone = &ftl->zones[zone_num]; | |
747 | struct sm_oob oob; | |
748 | uint16_t block; | |
749 | int lba; | |
750 | int i = 0; | |
133fa8c7 | 751 | int len; |
7d17c02a ML |
752 | |
753 | dbg("initializing zone %d", zone_num); | |
754 | ||
755 | /* Allocate memory for FTL table */ | |
6da2ec56 | 756 | zone->lba_to_phys_table = kmalloc_array(ftl->max_lba, 2, GFP_KERNEL); |
7d17c02a ML |
757 | |
758 | if (!zone->lba_to_phys_table) | |
759 | return -ENOMEM; | |
760 | memset(zone->lba_to_phys_table, -1, ftl->max_lba * 2); | |
761 | ||
762 | ||
763 | /* Allocate memory for free sectors FIFO */ | |
764 | if (kfifo_alloc(&zone->free_sectors, ftl->zone_size * 2, GFP_KERNEL)) { | |
765 | kfree(zone->lba_to_phys_table); | |
766 | return -ENOMEM; | |
767 | } | |
768 | ||
769 | /* Now scan the zone */ | |
770 | for (block = 0 ; block < ftl->zone_size ; block++) { | |
771 | ||
772 | /* Skip blocks till the CIS (including) */ | |
773 | if (zone_num == 0 && block <= ftl->cis_block) | |
774 | continue; | |
775 | ||
776 | /* Read the oob of first sector */ | |
777 | if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob)) | |
778 | return -EIO; | |
779 | ||
780 | /* Test to see if block is erased. It is enough to test | |
781 | first sector, because erase happens in one shot */ | |
782 | if (sm_block_erased(&oob)) { | |
783 | kfifo_in(&zone->free_sectors, | |
784 | (unsigned char *)&block, 2); | |
785 | continue; | |
786 | } | |
787 | ||
788 | /* If block is marked as bad, skip it */ | |
789 | /* This assumes we can trust first sector*/ | |
790 | /* However the way the block valid status is defined, ensures | |
791 | very low probability of failure here */ | |
792 | if (!sm_block_valid(&oob)) { | |
793 | dbg("PH %04d <-> <marked bad>", block); | |
794 | continue; | |
795 | } | |
796 | ||
797 | ||
798 | lba = sm_read_lba(&oob); | |
799 | ||
800 | /* Invalid LBA means that block is damaged. */ | |
801 | /* We can try to erase it, or mark it as bad, but | |
802 | lets leave that to recovery application */ | |
803 | if (lba == -2 || lba >= ftl->max_lba) { | |
804 | dbg("PH %04d <-> LBA %04d(bad)", block, lba); | |
805 | continue; | |
806 | } | |
807 | ||
808 | ||
809 | /* If there is no collision, | |
810 | just put the sector in the FTL table */ | |
811 | if (zone->lba_to_phys_table[lba] < 0) { | |
812 | dbg_verbose("PH %04d <-> LBA %04d", block, lba); | |
813 | zone->lba_to_phys_table[lba] = block; | |
814 | continue; | |
815 | } | |
816 | ||
817 | sm_printk("collision" | |
818 | " of LBA %d between blocks %d and %d in zone %d", | |
819 | lba, zone->lba_to_phys_table[lba], block, zone_num); | |
820 | ||
821 | /* Test that this block is valid*/ | |
822 | if (sm_check_block(ftl, zone_num, block)) | |
823 | continue; | |
824 | ||
825 | /* Test now the old block */ | |
826 | if (sm_check_block(ftl, zone_num, | |
827 | zone->lba_to_phys_table[lba])) { | |
828 | zone->lba_to_phys_table[lba] = block; | |
829 | continue; | |
830 | } | |
831 | ||
832 | /* If both blocks are valid and share same LBA, it means that | |
833 | they hold different versions of same data. It not | |
834 | known which is more recent, thus just erase one of them | |
835 | */ | |
836 | sm_printk("both blocks are valid, erasing the later"); | |
837 | sm_erase_block(ftl, zone_num, block, 1); | |
838 | } | |
839 | ||
840 | dbg("zone initialized"); | |
841 | zone->initialized = 1; | |
842 | ||
843 | /* No free sectors, means that the zone is heavily damaged, write won't | |
844 | work, but it can still can be (partially) read */ | |
845 | if (!kfifo_len(&zone->free_sectors)) { | |
846 | sm_printk("no free blocks in zone %d", zone_num); | |
847 | return 0; | |
848 | } | |
849 | ||
850 | /* Randomize first block we write to */ | |
851 | get_random_bytes(&i, 2); | |
852 | i %= (kfifo_len(&zone->free_sectors) / 2); | |
853 | ||
854 | while (i--) { | |
133fa8c7 ML |
855 | len = kfifo_out(&zone->free_sectors, |
856 | (unsigned char *)&block, 2); | |
857 | WARN_ON(len != 2); | |
7d17c02a ML |
858 | kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2); |
859 | } | |
860 | return 0; | |
861 | } | |
862 | ||
25985edc | 863 | /* Get and automatically initialize an FTL mapping for one zone */ |
582b2ffc | 864 | static struct ftl_zone *sm_get_zone(struct sm_ftl *ftl, int zone_num) |
7d17c02a ML |
865 | { |
866 | struct ftl_zone *zone; | |
867 | int error; | |
868 | ||
869 | BUG_ON(zone_num >= ftl->zone_count); | |
870 | zone = &ftl->zones[zone_num]; | |
871 | ||
872 | if (!zone->initialized) { | |
873 | error = sm_init_zone(ftl, zone_num); | |
874 | ||
875 | if (error) | |
876 | return ERR_PTR(error); | |
877 | } | |
878 | return zone; | |
879 | } | |
880 | ||
881 | ||
882 | /* ----------------- cache handling ------------------------------------------*/ | |
883 | ||
884 | /* Initialize the one block cache */ | |
582b2ffc | 885 | static void sm_cache_init(struct sm_ftl *ftl) |
7d17c02a ML |
886 | { |
887 | ftl->cache_data_invalid_bitmap = 0xFFFFFFFF; | |
888 | ftl->cache_clean = 1; | |
889 | ftl->cache_zone = -1; | |
890 | ftl->cache_block = -1; | |
891 | /*memset(ftl->cache_data, 0xAA, ftl->block_size);*/ | |
892 | } | |
893 | ||
894 | /* Put sector in one block cache */ | |
582b2ffc | 895 | static void sm_cache_put(struct sm_ftl *ftl, char *buffer, int boffset) |
7d17c02a ML |
896 | { |
897 | memcpy(ftl->cache_data + boffset, buffer, SM_SECTOR_SIZE); | |
898 | clear_bit(boffset / SM_SECTOR_SIZE, &ftl->cache_data_invalid_bitmap); | |
899 | ftl->cache_clean = 0; | |
900 | } | |
901 | ||
902 | /* Read a sector from the cache */ | |
582b2ffc | 903 | static int sm_cache_get(struct sm_ftl *ftl, char *buffer, int boffset) |
7d17c02a ML |
904 | { |
905 | if (test_bit(boffset / SM_SECTOR_SIZE, | |
906 | &ftl->cache_data_invalid_bitmap)) | |
907 | return -1; | |
908 | ||
909 | memcpy(buffer, ftl->cache_data + boffset, SM_SECTOR_SIZE); | |
910 | return 0; | |
911 | } | |
912 | ||
913 | /* Write the cache to hardware */ | |
582b2ffc | 914 | static int sm_cache_flush(struct sm_ftl *ftl) |
7d17c02a ML |
915 | { |
916 | struct ftl_zone *zone; | |
917 | ||
918 | int sector_num; | |
919 | uint16_t write_sector; | |
920 | int zone_num = ftl->cache_zone; | |
921 | int block_num; | |
922 | ||
923 | if (ftl->cache_clean) | |
924 | return 0; | |
925 | ||
926 | if (ftl->unstable) | |
927 | return -EIO; | |
928 | ||
929 | BUG_ON(zone_num < 0); | |
930 | zone = &ftl->zones[zone_num]; | |
931 | block_num = zone->lba_to_phys_table[ftl->cache_block]; | |
932 | ||
933 | ||
934 | /* Try to read all unread areas of the cache block*/ | |
fed457a8 | 935 | for_each_set_bit(sector_num, &ftl->cache_data_invalid_bitmap, |
7d17c02a ML |
936 | ftl->block_size / SM_SECTOR_SIZE) { |
937 | ||
938 | if (!sm_read_sector(ftl, | |
939 | zone_num, block_num, sector_num * SM_SECTOR_SIZE, | |
940 | ftl->cache_data + sector_num * SM_SECTOR_SIZE, NULL)) | |
941 | clear_bit(sector_num, | |
942 | &ftl->cache_data_invalid_bitmap); | |
943 | } | |
944 | restart: | |
945 | ||
946 | if (ftl->unstable) | |
947 | return -EIO; | |
133fa8c7 ML |
948 | |
949 | /* If there are no spare blocks, */ | |
950 | /* we could still continue by erasing/writing the current block, | |
7d17c02a ML |
951 | but for such worn out media it doesn't worth the trouble, |
952 | and the dangers */ | |
133fa8c7 ML |
953 | if (kfifo_out(&zone->free_sectors, |
954 | (unsigned char *)&write_sector, 2) != 2) { | |
7d17c02a ML |
955 | dbg("no free sectors for write!"); |
956 | return -EIO; | |
957 | } | |
958 | ||
7d17c02a ML |
959 | |
960 | if (sm_write_block(ftl, ftl->cache_data, zone_num, write_sector, | |
961 | ftl->cache_block, ftl->cache_data_invalid_bitmap)) | |
962 | goto restart; | |
963 | ||
964 | /* Update the FTL table */ | |
965 | zone->lba_to_phys_table[ftl->cache_block] = write_sector; | |
966 | ||
967 | /* Write succesfull, so erase and free the old block */ | |
968 | if (block_num > 0) | |
969 | sm_erase_block(ftl, zone_num, block_num, 1); | |
970 | ||
971 | sm_cache_init(ftl); | |
972 | return 0; | |
973 | } | |
974 | ||
975 | ||
976 | /* flush timer, runs a second after last write */ | |
e99e88a9 | 977 | static void sm_cache_flush_timer(struct timer_list *t) |
7d17c02a | 978 | { |
e99e88a9 | 979 | struct sm_ftl *ftl = from_timer(ftl, t, timer); |
7d17c02a ML |
980 | queue_work(cache_flush_workqueue, &ftl->flush_work); |
981 | } | |
982 | ||
983 | /* cache flush work, kicked by timer */ | |
984 | static void sm_cache_flush_work(struct work_struct *work) | |
985 | { | |
986 | struct sm_ftl *ftl = container_of(work, struct sm_ftl, flush_work); | |
987 | mutex_lock(&ftl->mutex); | |
988 | sm_cache_flush(ftl); | |
989 | mutex_unlock(&ftl->mutex); | |
990 | return; | |
991 | } | |
992 | ||
993 | /* ---------------- outside interface -------------------------------------- */ | |
994 | ||
995 | /* outside interface: read a sector */ | |
996 | static int sm_read(struct mtd_blktrans_dev *dev, | |
997 | unsigned long sect_no, char *buf) | |
998 | { | |
999 | struct sm_ftl *ftl = dev->priv; | |
1000 | struct ftl_zone *zone; | |
1001 | int error = 0, in_cache = 0; | |
1002 | int zone_num, block, boffset; | |
1003 | ||
1004 | sm_break_offset(ftl, sect_no << 9, &zone_num, &block, &boffset); | |
1005 | mutex_lock(&ftl->mutex); | |
1006 | ||
1007 | ||
1008 | zone = sm_get_zone(ftl, zone_num); | |
1009 | if (IS_ERR(zone)) { | |
1010 | error = PTR_ERR(zone); | |
1011 | goto unlock; | |
1012 | } | |
1013 | ||
1014 | /* Have to look at cache first */ | |
1015 | if (ftl->cache_zone == zone_num && ftl->cache_block == block) { | |
1016 | in_cache = 1; | |
1017 | if (!sm_cache_get(ftl, buf, boffset)) | |
1018 | goto unlock; | |
1019 | } | |
1020 | ||
1021 | /* Translate the block and return if doesn't exist in the table */ | |
1022 | block = zone->lba_to_phys_table[block]; | |
1023 | ||
1024 | if (block == -1) { | |
1025 | memset(buf, 0xFF, SM_SECTOR_SIZE); | |
1026 | goto unlock; | |
1027 | } | |
1028 | ||
1029 | if (sm_read_sector(ftl, zone_num, block, boffset, buf, NULL)) { | |
1030 | error = -EIO; | |
1031 | goto unlock; | |
1032 | } | |
1033 | ||
1034 | if (in_cache) | |
1035 | sm_cache_put(ftl, buf, boffset); | |
1036 | unlock: | |
1037 | mutex_unlock(&ftl->mutex); | |
1038 | return error; | |
1039 | } | |
1040 | ||
1041 | /* outside interface: write a sector */ | |
1042 | static int sm_write(struct mtd_blktrans_dev *dev, | |
1043 | unsigned long sec_no, char *buf) | |
1044 | { | |
1045 | struct sm_ftl *ftl = dev->priv; | |
1046 | struct ftl_zone *zone; | |
f7f0d358 | 1047 | int error = 0, zone_num, block, boffset; |
7d17c02a ML |
1048 | |
1049 | BUG_ON(ftl->readonly); | |
1050 | sm_break_offset(ftl, sec_no << 9, &zone_num, &block, &boffset); | |
1051 | ||
1052 | /* No need in flush thread running now */ | |
1053 | del_timer(&ftl->timer); | |
1054 | mutex_lock(&ftl->mutex); | |
1055 | ||
1056 | zone = sm_get_zone(ftl, zone_num); | |
1057 | if (IS_ERR(zone)) { | |
1058 | error = PTR_ERR(zone); | |
1059 | goto unlock; | |
1060 | } | |
1061 | ||
1062 | /* If entry is not in cache, flush it */ | |
1063 | if (ftl->cache_block != block || ftl->cache_zone != zone_num) { | |
1064 | ||
1065 | error = sm_cache_flush(ftl); | |
1066 | if (error) | |
1067 | goto unlock; | |
1068 | ||
1069 | ftl->cache_block = block; | |
1070 | ftl->cache_zone = zone_num; | |
1071 | } | |
1072 | ||
1073 | sm_cache_put(ftl, buf, boffset); | |
1074 | unlock: | |
1075 | mod_timer(&ftl->timer, jiffies + msecs_to_jiffies(cache_timeout)); | |
1076 | mutex_unlock(&ftl->mutex); | |
1077 | return error; | |
1078 | } | |
1079 | ||
1080 | /* outside interface: flush everything */ | |
1081 | static int sm_flush(struct mtd_blktrans_dev *dev) | |
1082 | { | |
1083 | struct sm_ftl *ftl = dev->priv; | |
1084 | int retval; | |
1085 | ||
1086 | mutex_lock(&ftl->mutex); | |
1087 | retval = sm_cache_flush(ftl); | |
1088 | mutex_unlock(&ftl->mutex); | |
1089 | return retval; | |
1090 | } | |
1091 | ||
1092 | /* outside interface: device is released */ | |
a8ca889e | 1093 | static void sm_release(struct mtd_blktrans_dev *dev) |
7d17c02a ML |
1094 | { |
1095 | struct sm_ftl *ftl = dev->priv; | |
1096 | ||
1097 | mutex_lock(&ftl->mutex); | |
1098 | del_timer_sync(&ftl->timer); | |
1099 | cancel_work_sync(&ftl->flush_work); | |
1100 | sm_cache_flush(ftl); | |
1101 | mutex_unlock(&ftl->mutex); | |
7d17c02a ML |
1102 | } |
1103 | ||
1104 | /* outside interface: get geometry */ | |
1105 | static int sm_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) | |
1106 | { | |
1107 | struct sm_ftl *ftl = dev->priv; | |
1108 | geo->heads = ftl->heads; | |
1109 | geo->sectors = ftl->sectors; | |
1110 | geo->cylinders = ftl->cylinders; | |
1111 | return 0; | |
1112 | } | |
1113 | ||
1114 | /* external interface: main initialization function */ | |
1115 | static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) | |
1116 | { | |
1117 | struct mtd_blktrans_dev *trans; | |
1118 | struct sm_ftl *ftl; | |
1119 | ||
1120 | /* Allocate & initialize our private structure */ | |
1121 | ftl = kzalloc(sizeof(struct sm_ftl), GFP_KERNEL); | |
1122 | if (!ftl) | |
1123 | goto error1; | |
1124 | ||
1125 | ||
1126 | mutex_init(&ftl->mutex); | |
e99e88a9 | 1127 | timer_setup(&ftl->timer, sm_cache_flush_timer, 0); |
7d17c02a | 1128 | INIT_WORK(&ftl->flush_work, sm_cache_flush_work); |
7d17c02a ML |
1129 | |
1130 | /* Read media information */ | |
1131 | if (sm_get_media_info(ftl, mtd)) { | |
1132 | dbg("found unsupported mtd device, aborting"); | |
1133 | goto error2; | |
1134 | } | |
1135 | ||
1136 | ||
1137 | /* Allocate temporary CIS buffer for read retry support */ | |
1138 | ftl->cis_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL); | |
1139 | if (!ftl->cis_buffer) | |
1140 | goto error2; | |
1141 | ||
1142 | /* Allocate zone array, it will be initialized on demand */ | |
6396bb22 | 1143 | ftl->zones = kcalloc(ftl->zone_count, sizeof(struct ftl_zone), |
7d17c02a ML |
1144 | GFP_KERNEL); |
1145 | if (!ftl->zones) | |
1146 | goto error3; | |
1147 | ||
1148 | /* Allocate the cache*/ | |
1149 | ftl->cache_data = kzalloc(ftl->block_size, GFP_KERNEL); | |
1150 | ||
1151 | if (!ftl->cache_data) | |
1152 | goto error4; | |
1153 | ||
1154 | sm_cache_init(ftl); | |
1155 | ||
1156 | ||
1157 | /* Allocate upper layer structure and initialize it */ | |
1158 | trans = kzalloc(sizeof(struct mtd_blktrans_dev), GFP_KERNEL); | |
1159 | if (!trans) | |
1160 | goto error5; | |
1161 | ||
1162 | ftl->trans = trans; | |
1163 | trans->priv = ftl; | |
1164 | ||
1165 | trans->tr = tr; | |
1166 | trans->mtd = mtd; | |
1167 | trans->devnum = -1; | |
1168 | trans->size = (ftl->block_size * ftl->max_lba * ftl->zone_count) >> 9; | |
1169 | trans->readonly = ftl->readonly; | |
1170 | ||
1171 | if (sm_find_cis(ftl)) { | |
1172 | dbg("CIS not found on mtd device, aborting"); | |
1173 | goto error6; | |
1174 | } | |
1175 | ||
1176 | ftl->disk_attributes = sm_create_sysfs_attributes(ftl); | |
629286b9 XW |
1177 | if (!ftl->disk_attributes) |
1178 | goto error6; | |
7d17c02a ML |
1179 | trans->disk_attributes = ftl->disk_attributes; |
1180 | ||
1181 | sm_printk("Found %d MiB xD/SmartMedia FTL on mtd%d", | |
1182 | (int)(mtd->size / (1024 * 1024)), mtd->index); | |
1183 | ||
1184 | dbg("FTL layout:"); | |
1185 | dbg("%d zone(s), each consists of %d blocks (+%d spares)", | |
1186 | ftl->zone_count, ftl->max_lba, | |
1187 | ftl->zone_size - ftl->max_lba); | |
1188 | dbg("each block consists of %d bytes", | |
1189 | ftl->block_size); | |
1190 | ||
1191 | ||
1192 | /* Register device*/ | |
1193 | if (add_mtd_blktrans_dev(trans)) { | |
1194 | dbg("error in mtdblktrans layer"); | |
1195 | goto error6; | |
1196 | } | |
1197 | return; | |
1198 | error6: | |
1199 | kfree(trans); | |
1200 | error5: | |
1201 | kfree(ftl->cache_data); | |
1202 | error4: | |
1203 | kfree(ftl->zones); | |
1204 | error3: | |
1205 | kfree(ftl->cis_buffer); | |
1206 | error2: | |
1207 | kfree(ftl); | |
1208 | error1: | |
1209 | return; | |
1210 | } | |
1211 | ||
1212 | /* main interface: device {surprise,} removal */ | |
1213 | static void sm_remove_dev(struct mtd_blktrans_dev *dev) | |
1214 | { | |
1215 | struct sm_ftl *ftl = dev->priv; | |
1216 | int i; | |
1217 | ||
1218 | del_mtd_blktrans_dev(dev); | |
1219 | ftl->trans = NULL; | |
1220 | ||
1221 | for (i = 0 ; i < ftl->zone_count; i++) { | |
1222 | ||
1223 | if (!ftl->zones[i].initialized) | |
1224 | continue; | |
1225 | ||
1226 | kfree(ftl->zones[i].lba_to_phys_table); | |
1227 | kfifo_free(&ftl->zones[i].free_sectors); | |
1228 | } | |
1229 | ||
1230 | sm_delete_sysfs_attributes(ftl); | |
1231 | kfree(ftl->cis_buffer); | |
1232 | kfree(ftl->zones); | |
1233 | kfree(ftl->cache_data); | |
1234 | kfree(ftl); | |
1235 | } | |
1236 | ||
1237 | static struct mtd_blktrans_ops sm_ftl_ops = { | |
1238 | .name = "smblk", | |
452380ef | 1239 | .major = 0, |
7d17c02a ML |
1240 | .part_bits = SM_FTL_PARTN_BITS, |
1241 | .blksize = SM_SECTOR_SIZE, | |
1242 | .getgeo = sm_getgeo, | |
1243 | ||
1244 | .add_mtd = sm_add_mtd, | |
1245 | .remove_dev = sm_remove_dev, | |
1246 | ||
1247 | .readsect = sm_read, | |
1248 | .writesect = sm_write, | |
1249 | ||
1250 | .flush = sm_flush, | |
1251 | .release = sm_release, | |
1252 | ||
1253 | .owner = THIS_MODULE, | |
1254 | }; | |
1255 | ||
1256 | static __init int sm_module_init(void) | |
1257 | { | |
1258 | int error = 0; | |
7d17c02a | 1259 | |
39de86ef DC |
1260 | cache_flush_workqueue = create_freezable_workqueue("smflush"); |
1261 | if (!cache_flush_workqueue) | |
1262 | return -ENOMEM; | |
7d17c02a ML |
1263 | |
1264 | error = register_mtd_blktrans(&sm_ftl_ops); | |
1265 | if (error) | |
1266 | destroy_workqueue(cache_flush_workqueue); | |
1267 | return error; | |
1268 | ||
1269 | } | |
1270 | ||
1271 | static void __exit sm_module_exit(void) | |
1272 | { | |
1273 | destroy_workqueue(cache_flush_workqueue); | |
1274 | deregister_mtd_blktrans(&sm_ftl_ops); | |
1275 | } | |
1276 | ||
1277 | module_init(sm_module_init); | |
1278 | module_exit(sm_module_exit); | |
1279 | ||
1280 | MODULE_LICENSE("GPL"); | |
1281 | MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); | |
1282 | MODULE_DESCRIPTION("Smartmedia/xD mtd translation layer"); |