Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 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> |
Stephen Rothwell | 8da552f | 2010-03-29 16:53:13 +1100 | [diff] [blame] | 18 | #include <linux/slab.h> |
Maxim Levitsky | 01de69c | 2010-03-19 14:05:51 +0200 | [diff] [blame] | 19 | #include <linux/mtd/nand_ecc.h> |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 20 | #include "nand/sm_common.h" |
| 21 | #include "sm_ftl.h" |
| 22 | |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 23 | |
| 24 | |
| 25 | struct workqueue_struct *cache_flush_workqueue; |
| 26 | |
| 27 | static int cache_timeout = 1000; |
| 28 | module_param(cache_timeout, bool, S_IRUGO); |
| 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 | |
| 37 | /* ------------------- sysfs attributtes ---------------------------------- */ |
| 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; |
| 62 | |
| 63 | int vendor_len = strnlen(ftl->cis_buffer + SM_CIS_VENDOR_OFFSET, |
| 64 | SM_SMALL_PAGE - SM_CIS_VENDOR_OFFSET); |
| 65 | |
| 66 | char *vendor = kmalloc(vendor_len, GFP_KERNEL); |
| 67 | memcpy(vendor, ftl->cis_buffer + SM_CIS_VENDOR_OFFSET, vendor_len); |
| 68 | vendor[vendor_len] = 0; |
| 69 | |
| 70 | /* Initialize sysfs attributes */ |
| 71 | vendor_attribute = |
| 72 | kzalloc(sizeof(struct sm_sysfs_attribute), GFP_KERNEL); |
| 73 | |
Maxim Levitsky | ca7081d | 2010-03-19 17:22:53 +0200 | [diff] [blame] | 74 | sysfs_attr_init(&vendor_attribute->dev_attr.attr); |
| 75 | |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 76 | vendor_attribute->data = vendor; |
| 77 | vendor_attribute->len = vendor_len; |
| 78 | vendor_attribute->dev_attr.attr.name = "vendor"; |
| 79 | vendor_attribute->dev_attr.attr.mode = S_IRUGO; |
| 80 | vendor_attribute->dev_attr.show = sm_attr_show; |
| 81 | |
| 82 | |
| 83 | /* Create array of pointers to the attributes */ |
| 84 | attributes = kzalloc(sizeof(struct attribute *) * (NUM_ATTRIBUTES + 1), |
| 85 | GFP_KERNEL); |
| 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); |
| 90 | attr_group->attrs = attributes; |
| 91 | return attr_group; |
| 92 | } |
| 93 | |
| 94 | void sm_delete_sysfs_attributes(struct sm_ftl *ftl) |
| 95 | { |
| 96 | struct attribute **attributes = ftl->disk_attributes->attrs; |
| 97 | int i; |
| 98 | |
| 99 | for (i = 0; attributes[i] ; i++) { |
| 100 | |
| 101 | struct device_attribute *dev_attr = container_of(attributes[i], |
| 102 | struct device_attribute, attr); |
| 103 | |
| 104 | struct sm_sysfs_attribute *sm_attr = |
| 105 | container_of(dev_attr, |
| 106 | struct sm_sysfs_attribute, dev_attr); |
| 107 | |
| 108 | kfree(sm_attr->data); |
| 109 | kfree(sm_attr); |
| 110 | } |
| 111 | |
| 112 | kfree(ftl->disk_attributes->attrs); |
| 113 | kfree(ftl->disk_attributes); |
| 114 | } |
| 115 | |
| 116 | |
| 117 | /* ----------------------- oob helpers -------------------------------------- */ |
| 118 | |
| 119 | static int sm_get_lba(uint8_t *lba) |
| 120 | { |
| 121 | /* check fixed bits */ |
| 122 | if ((lba[0] & 0xF8) != 0x10) |
| 123 | return -2; |
| 124 | |
| 125 | /* check parity - endianess doesn't matter */ |
| 126 | if (hweight16(*(uint16_t *)lba) & 1) |
| 127 | return -2; |
| 128 | |
| 129 | return (lba[1] >> 1) | ((lba[0] & 0x07) << 7); |
| 130 | } |
| 131 | |
| 132 | |
| 133 | /* |
| 134 | * Read LBA asscociated with block |
| 135 | * returns -1, if block is erased |
| 136 | * returns -2 if error happens |
| 137 | */ |
| 138 | static int sm_read_lba(struct sm_oob *oob) |
| 139 | { |
| 140 | static const uint32_t erased_pattern[4] = { |
| 141 | 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF }; |
| 142 | |
| 143 | uint16_t lba_test; |
| 144 | int lba; |
| 145 | |
| 146 | /* First test for erased block */ |
| 147 | if (!memcmp(oob, erased_pattern, SM_OOB_SIZE)) |
| 148 | return -1; |
| 149 | |
| 150 | /* Now check is both copies of the LBA differ too much */ |
| 151 | lba_test = *(uint16_t *)oob->lba_copy1 ^ *(uint16_t*)oob->lba_copy2; |
| 152 | if (lba_test && !is_power_of_2(lba_test)) |
| 153 | return -2; |
| 154 | |
| 155 | /* And read it */ |
| 156 | lba = sm_get_lba(oob->lba_copy1); |
| 157 | |
| 158 | if (lba == -2) |
| 159 | lba = sm_get_lba(oob->lba_copy2); |
| 160 | |
| 161 | return lba; |
| 162 | } |
| 163 | |
| 164 | static void sm_write_lba(struct sm_oob *oob, uint16_t lba) |
| 165 | { |
| 166 | uint8_t tmp[2]; |
| 167 | |
| 168 | WARN_ON(lba >= 1000); |
| 169 | |
| 170 | tmp[0] = 0x10 | ((lba >> 7) & 0x07); |
| 171 | tmp[1] = (lba << 1) & 0xFF; |
| 172 | |
| 173 | if (hweight16(*(uint16_t *)tmp) & 0x01) |
| 174 | tmp[1] |= 1; |
| 175 | |
| 176 | oob->lba_copy1[0] = oob->lba_copy2[0] = tmp[0]; |
| 177 | oob->lba_copy1[1] = oob->lba_copy2[1] = tmp[1]; |
| 178 | } |
| 179 | |
| 180 | |
| 181 | /* Make offset from parts */ |
| 182 | static loff_t sm_mkoffset(struct sm_ftl *ftl, int zone, int block, int boffset) |
| 183 | { |
| 184 | WARN_ON(boffset & (SM_SECTOR_SIZE - 1)); |
| 185 | WARN_ON(zone < 0 || zone >= ftl->zone_count); |
| 186 | WARN_ON(block >= ftl->zone_size); |
| 187 | WARN_ON(boffset >= ftl->block_size); |
| 188 | |
| 189 | if (block == -1) |
| 190 | return -1; |
| 191 | |
| 192 | return (zone * SM_MAX_ZONE_SIZE + block) * ftl->block_size + boffset; |
| 193 | } |
| 194 | |
| 195 | /* Breaks offset into parts */ |
| 196 | static void sm_break_offset(struct sm_ftl *ftl, loff_t offset, |
| 197 | int *zone, int *block, int *boffset) |
| 198 | { |
| 199 | *boffset = do_div(offset, ftl->block_size); |
| 200 | *block = do_div(offset, ftl->max_lba); |
| 201 | *zone = offset >= ftl->zone_count ? -1 : offset; |
| 202 | } |
| 203 | |
| 204 | /* ---------------------- low level IO ------------------------------------- */ |
| 205 | |
| 206 | static int sm_correct_sector(uint8_t *buffer, struct sm_oob *oob) |
| 207 | { |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 208 | uint8_t ecc[3]; |
| 209 | |
| 210 | __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc); |
| 211 | if (__nand_correct_data(buffer, ecc, oob->ecc1, SM_SMALL_PAGE) < 0) |
| 212 | return -EIO; |
| 213 | |
| 214 | buffer += SM_SMALL_PAGE; |
| 215 | |
| 216 | __nand_calculate_ecc(buffer, SM_SMALL_PAGE, ecc); |
| 217 | if (__nand_correct_data(buffer, ecc, oob->ecc2, SM_SMALL_PAGE) < 0) |
| 218 | return -EIO; |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 219 | return 0; |
| 220 | } |
| 221 | |
| 222 | /* Reads a sector + oob*/ |
| 223 | static int sm_read_sector(struct sm_ftl *ftl, |
| 224 | int zone, int block, int boffset, |
| 225 | uint8_t *buffer, struct sm_oob *oob) |
| 226 | { |
| 227 | struct mtd_info *mtd = ftl->trans->mtd; |
| 228 | struct mtd_oob_ops ops; |
| 229 | struct sm_oob tmp_oob; |
Maxim Levitsky | 133fa8c | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 230 | int ret = -EIO; |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 231 | int try = 0; |
| 232 | |
| 233 | /* FTL can contain -1 entries that are by default filled with bits */ |
| 234 | if (block == -1) { |
| 235 | memset(buffer, 0xFF, SM_SECTOR_SIZE); |
| 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | /* User might not need the oob, but we do for data vertification */ |
| 240 | if (!oob) |
| 241 | oob = &tmp_oob; |
| 242 | |
| 243 | ops.mode = ftl->smallpagenand ? MTD_OOB_RAW : MTD_OOB_PLACE; |
| 244 | ops.ooboffs = 0; |
| 245 | ops.ooblen = SM_OOB_SIZE; |
| 246 | ops.oobbuf = (void *)oob; |
| 247 | ops.len = SM_SECTOR_SIZE; |
| 248 | ops.datbuf = buffer; |
| 249 | |
| 250 | again: |
| 251 | if (try++) { |
| 252 | /* Avoid infinite recursion on CIS reads, sm_recheck_media |
| 253 | won't help anyway */ |
| 254 | if (zone == 0 && block == ftl->cis_block && boffset == |
| 255 | ftl->cis_boffset) |
| 256 | return ret; |
| 257 | |
| 258 | /* Test if media is stable */ |
| 259 | if (try == 3 || sm_recheck_media(ftl)) |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | /* Unfortunelly, oob read will _always_ succeed, |
| 264 | despite card removal..... */ |
| 265 | ret = mtd->read_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops); |
| 266 | |
| 267 | /* Test for unknown errors */ |
| 268 | if (ret != 0 && ret != -EUCLEAN && ret != -EBADMSG) { |
| 269 | dbg("read of block %d at zone %d, failed due to error (%d)", |
| 270 | block, zone, ret); |
| 271 | goto again; |
| 272 | } |
| 273 | |
| 274 | /* Do a basic test on the oob, to guard against returned garbage */ |
| 275 | if (oob->reserved != 0xFFFFFFFF && !is_power_of_2(~oob->reserved)) |
| 276 | goto again; |
| 277 | |
| 278 | /* This should never happen, unless there is a bug in the mtd driver */ |
| 279 | WARN_ON(ops.oobretlen != SM_OOB_SIZE); |
| 280 | WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE); |
| 281 | |
| 282 | if (!buffer) |
| 283 | return 0; |
| 284 | |
| 285 | /* Test if sector marked as bad */ |
| 286 | if (!sm_sector_valid(oob)) { |
| 287 | dbg("read of block %d at zone %d, failed because it is marked" |
| 288 | " as bad" , block, zone); |
| 289 | goto again; |
| 290 | } |
| 291 | |
| 292 | /* Test ECC*/ |
| 293 | if (ret == -EBADMSG || |
| 294 | (ftl->smallpagenand && sm_correct_sector(buffer, oob))) { |
| 295 | |
| 296 | dbg("read of block %d at zone %d, failed due to ECC error", |
| 297 | block, zone); |
| 298 | goto again; |
| 299 | } |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | /* Writes a sector to media */ |
| 305 | static int sm_write_sector(struct sm_ftl *ftl, |
| 306 | int zone, int block, int boffset, |
| 307 | uint8_t *buffer, struct sm_oob *oob) |
| 308 | { |
| 309 | struct mtd_oob_ops ops; |
| 310 | struct mtd_info *mtd = ftl->trans->mtd; |
| 311 | int ret; |
| 312 | |
| 313 | BUG_ON(ftl->readonly); |
| 314 | |
| 315 | if (zone == 0 && (block == ftl->cis_block || block == 0)) { |
| 316 | dbg("attempted to write the CIS!"); |
| 317 | return -EIO; |
| 318 | } |
| 319 | |
| 320 | if (ftl->unstable) |
| 321 | return -EIO; |
| 322 | |
| 323 | ops.mode = ftl->smallpagenand ? MTD_OOB_RAW : MTD_OOB_PLACE; |
| 324 | ops.len = SM_SECTOR_SIZE; |
| 325 | ops.datbuf = buffer; |
| 326 | ops.ooboffs = 0; |
| 327 | ops.ooblen = SM_OOB_SIZE; |
| 328 | ops.oobbuf = (void *)oob; |
| 329 | |
| 330 | ret = mtd->write_oob(mtd, sm_mkoffset(ftl, zone, block, boffset), &ops); |
| 331 | |
| 332 | /* Now we assume that hardware will catch write bitflip errors */ |
| 333 | /* If you are paranoid, use CONFIG_MTD_NAND_VERIFY_WRITE */ |
| 334 | |
| 335 | if (ret) { |
| 336 | dbg("write to block %d at zone %d, failed with error %d", |
| 337 | block, zone, ret); |
| 338 | |
| 339 | sm_recheck_media(ftl); |
| 340 | return ret; |
| 341 | } |
| 342 | |
| 343 | /* This should never happen, unless there is a bug in the driver */ |
| 344 | WARN_ON(ops.oobretlen != SM_OOB_SIZE); |
| 345 | WARN_ON(buffer && ops.retlen != SM_SECTOR_SIZE); |
| 346 | |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | /* ------------------------ block IO ------------------------------------- */ |
| 351 | |
| 352 | /* Write a block using data and lba, and invalid sector bitmap */ |
| 353 | static int sm_write_block(struct sm_ftl *ftl, uint8_t *buf, |
| 354 | int zone, int block, int lba, |
| 355 | unsigned long invalid_bitmap) |
| 356 | { |
| 357 | struct sm_oob oob; |
| 358 | int boffset; |
| 359 | int retry = 0; |
| 360 | |
| 361 | /* Initialize the oob with requested values */ |
| 362 | memset(&oob, 0xFF, SM_OOB_SIZE); |
| 363 | sm_write_lba(&oob, lba); |
| 364 | restart: |
| 365 | if (ftl->unstable) |
| 366 | return -EIO; |
| 367 | |
| 368 | for (boffset = 0; boffset < ftl->block_size; |
| 369 | boffset += SM_SECTOR_SIZE) { |
| 370 | |
| 371 | oob.data_status = 0xFF; |
| 372 | |
| 373 | if (test_bit(boffset / SM_SECTOR_SIZE, &invalid_bitmap)) { |
| 374 | |
| 375 | sm_printk("sector %d of block at LBA %d of zone %d" |
| 376 | " coudn't be read, marking it as invalid", |
| 377 | boffset / SM_SECTOR_SIZE, lba, zone); |
| 378 | |
| 379 | oob.data_status = 0; |
| 380 | } |
| 381 | |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 382 | if (ftl->smallpagenand) { |
| 383 | __nand_calculate_ecc(buf + boffset, |
| 384 | SM_SMALL_PAGE, oob.ecc1); |
| 385 | |
| 386 | __nand_calculate_ecc(buf + boffset + SM_SMALL_PAGE, |
| 387 | SM_SMALL_PAGE, oob.ecc2); |
| 388 | } |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 389 | if (!sm_write_sector(ftl, zone, block, boffset, |
| 390 | buf + boffset, &oob)) |
| 391 | continue; |
| 392 | |
| 393 | if (!retry) { |
| 394 | |
| 395 | /* If write fails. try to erase the block */ |
| 396 | /* This is safe, because we never write in blocks |
| 397 | that contain valuable data. |
| 398 | This is intended to repair block that are marked |
| 399 | as erased, but that isn't fully erased*/ |
| 400 | |
| 401 | if (sm_erase_block(ftl, zone, block, 0)) |
| 402 | return -EIO; |
| 403 | |
| 404 | retry = 1; |
| 405 | goto restart; |
| 406 | } else { |
| 407 | sm_mark_block_bad(ftl, zone, block); |
| 408 | return -EIO; |
| 409 | } |
| 410 | } |
| 411 | return 0; |
| 412 | } |
| 413 | |
| 414 | |
| 415 | /* Mark whole block at offset 'offs' as bad. */ |
| 416 | static void sm_mark_block_bad(struct sm_ftl *ftl, int zone, int block) |
| 417 | { |
| 418 | struct sm_oob oob; |
| 419 | int boffset; |
| 420 | |
| 421 | memset(&oob, 0xFF, SM_OOB_SIZE); |
| 422 | oob.block_status = 0xF0; |
| 423 | |
| 424 | if (ftl->unstable) |
| 425 | return; |
| 426 | |
| 427 | if (sm_recheck_media(ftl)) |
| 428 | return; |
| 429 | |
| 430 | sm_printk("marking block %d of zone %d as bad", block, zone); |
| 431 | |
| 432 | /* We aren't checking the return value, because we don't care */ |
| 433 | /* This also fails on fake xD cards, but I guess these won't expose |
| 434 | any bad blocks till fail completly */ |
| 435 | for (boffset = 0; boffset < ftl->block_size; boffset += SM_SECTOR_SIZE) |
| 436 | sm_write_sector(ftl, zone, block, boffset, NULL, &oob); |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Erase a block within a zone |
| 441 | * If erase succedes, it updates free block fifo, otherwise marks block as bad |
| 442 | */ |
| 443 | static int sm_erase_block(struct sm_ftl *ftl, int zone_num, uint16_t block, |
| 444 | int put_free) |
| 445 | { |
| 446 | struct ftl_zone *zone = &ftl->zones[zone_num]; |
| 447 | struct mtd_info *mtd = ftl->trans->mtd; |
| 448 | struct erase_info erase; |
| 449 | |
| 450 | erase.mtd = mtd; |
| 451 | erase.callback = sm_erase_callback; |
| 452 | erase.addr = sm_mkoffset(ftl, zone_num, block, 0); |
| 453 | erase.len = ftl->block_size; |
| 454 | erase.priv = (u_long)ftl; |
| 455 | |
| 456 | if (ftl->unstable) |
| 457 | return -EIO; |
| 458 | |
| 459 | BUG_ON(ftl->readonly); |
| 460 | |
| 461 | if (zone_num == 0 && (block == ftl->cis_block || block == 0)) { |
| 462 | sm_printk("attempted to erase the CIS!"); |
| 463 | return -EIO; |
| 464 | } |
| 465 | |
| 466 | if (mtd->erase(mtd, &erase)) { |
| 467 | sm_printk("erase of block %d in zone %d failed", |
| 468 | block, zone_num); |
| 469 | goto error; |
| 470 | } |
| 471 | |
| 472 | if (erase.state == MTD_ERASE_PENDING) |
| 473 | wait_for_completion(&ftl->erase_completion); |
| 474 | |
| 475 | if (erase.state != MTD_ERASE_DONE) { |
| 476 | sm_printk("erase of block %d in zone %d failed after wait", |
| 477 | block, zone_num); |
| 478 | goto error; |
| 479 | } |
| 480 | |
| 481 | if (put_free) |
| 482 | kfifo_in(&zone->free_sectors, |
| 483 | (const unsigned char *)&block, sizeof(block)); |
| 484 | |
| 485 | return 0; |
| 486 | error: |
| 487 | sm_mark_block_bad(ftl, zone_num, block); |
| 488 | return -EIO; |
| 489 | } |
| 490 | |
| 491 | static void sm_erase_callback(struct erase_info *self) |
| 492 | { |
| 493 | struct sm_ftl *ftl = (struct sm_ftl *)self->priv; |
| 494 | complete(&ftl->erase_completion); |
| 495 | } |
| 496 | |
| 497 | /* Throughtly test that block is valid. */ |
| 498 | static int sm_check_block(struct sm_ftl *ftl, int zone, int block) |
| 499 | { |
| 500 | int boffset; |
| 501 | struct sm_oob oob; |
| 502 | int lbas[] = { -3, 0, 0, 0 }; |
| 503 | int i = 0; |
| 504 | int test_lba; |
| 505 | |
| 506 | |
| 507 | /* First just check that block doesn't look fishy */ |
| 508 | /* Only blocks that are valid or are sliced in two parts, are |
| 509 | accepted */ |
| 510 | for (boffset = 0; boffset < ftl->block_size; |
| 511 | boffset += SM_SECTOR_SIZE) { |
| 512 | |
| 513 | /* This shoudn't happen anyway */ |
| 514 | if (sm_read_sector(ftl, zone, block, boffset, NULL, &oob)) |
| 515 | return -2; |
| 516 | |
| 517 | test_lba = sm_read_lba(&oob); |
| 518 | |
| 519 | if (lbas[i] != test_lba) |
| 520 | lbas[++i] = test_lba; |
| 521 | |
| 522 | /* If we found three different LBAs, something is fishy */ |
| 523 | if (i == 3) |
| 524 | return -EIO; |
| 525 | } |
| 526 | |
| 527 | /* If the block is sliced (partialy erased usually) erase it */ |
| 528 | if (i == 2) { |
| 529 | sm_erase_block(ftl, zone, block, 1); |
| 530 | return 1; |
| 531 | } |
| 532 | |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | /* ----------------- media scanning --------------------------------- */ |
| 537 | static const struct chs_entry chs_table[] = { |
| 538 | { 1, 125, 4, 4 }, |
| 539 | { 2, 125, 4, 8 }, |
| 540 | { 4, 250, 4, 8 }, |
| 541 | { 8, 250, 4, 16 }, |
| 542 | { 16, 500, 4, 16 }, |
| 543 | { 32, 500, 8, 16 }, |
| 544 | { 64, 500, 8, 32 }, |
| 545 | { 128, 500, 16, 32 }, |
| 546 | { 256, 1000, 16, 32 }, |
| 547 | { 512, 1015, 32, 63 }, |
| 548 | { 1024, 985, 33, 63 }, |
| 549 | { 2048, 985, 33, 63 }, |
| 550 | { 0 }, |
| 551 | }; |
| 552 | |
| 553 | |
| 554 | static const uint8_t cis_signature[] = { |
| 555 | 0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20 |
| 556 | }; |
| 557 | /* Find out media parameters. |
| 558 | * This ideally has to be based on nand id, but for now device size is enough */ |
| 559 | int sm_get_media_info(struct sm_ftl *ftl, struct mtd_info *mtd) |
| 560 | { |
| 561 | int i; |
| 562 | int size_in_megs = mtd->size / (1024 * 1024); |
| 563 | |
| 564 | ftl->readonly = mtd->type == MTD_ROM; |
| 565 | |
| 566 | /* Manual settings for very old devices */ |
| 567 | ftl->zone_count = 1; |
| 568 | ftl->smallpagenand = 0; |
| 569 | |
| 570 | switch (size_in_megs) { |
| 571 | case 1: |
| 572 | /* 1 MiB flash/rom SmartMedia card (256 byte pages)*/ |
| 573 | ftl->zone_size = 256; |
| 574 | ftl->max_lba = 250; |
| 575 | ftl->block_size = 8 * SM_SECTOR_SIZE; |
| 576 | ftl->smallpagenand = 1; |
| 577 | |
| 578 | break; |
| 579 | case 2: |
| 580 | /* 2 MiB flash SmartMedia (256 byte pages)*/ |
| 581 | if (mtd->writesize == SM_SMALL_PAGE) { |
| 582 | ftl->zone_size = 512; |
| 583 | ftl->max_lba = 500; |
| 584 | ftl->block_size = 8 * SM_SECTOR_SIZE; |
| 585 | ftl->smallpagenand = 1; |
| 586 | /* 2 MiB rom SmartMedia */ |
| 587 | } else { |
| 588 | |
| 589 | if (!ftl->readonly) |
| 590 | return -ENODEV; |
| 591 | |
| 592 | ftl->zone_size = 256; |
| 593 | ftl->max_lba = 250; |
| 594 | ftl->block_size = 16 * SM_SECTOR_SIZE; |
| 595 | } |
| 596 | break; |
| 597 | case 4: |
| 598 | /* 4 MiB flash/rom SmartMedia device */ |
| 599 | ftl->zone_size = 512; |
| 600 | ftl->max_lba = 500; |
| 601 | ftl->block_size = 16 * SM_SECTOR_SIZE; |
| 602 | break; |
| 603 | case 8: |
| 604 | /* 8 MiB flash/rom SmartMedia device */ |
| 605 | ftl->zone_size = 1024; |
| 606 | ftl->max_lba = 1000; |
| 607 | ftl->block_size = 16 * SM_SECTOR_SIZE; |
| 608 | } |
| 609 | |
| 610 | /* Minimum xD size is 16MiB. Also, all xD cards have standard zone |
| 611 | sizes. SmartMedia cards exist up to 128 MiB and have same layout*/ |
| 612 | if (size_in_megs >= 16) { |
| 613 | ftl->zone_count = size_in_megs / 16; |
| 614 | ftl->zone_size = 1024; |
| 615 | ftl->max_lba = 1000; |
| 616 | ftl->block_size = 32 * SM_SECTOR_SIZE; |
| 617 | } |
| 618 | |
| 619 | /* Test for proper write,erase and oob sizes */ |
| 620 | if (mtd->erasesize > ftl->block_size) |
| 621 | return -ENODEV; |
| 622 | |
| 623 | if (mtd->writesize > SM_SECTOR_SIZE) |
| 624 | return -ENODEV; |
| 625 | |
| 626 | if (ftl->smallpagenand && mtd->oobsize < SM_SMALL_OOB_SIZE) |
| 627 | return -ENODEV; |
| 628 | |
| 629 | if (!ftl->smallpagenand && mtd->oobsize < SM_OOB_SIZE) |
| 630 | return -ENODEV; |
| 631 | |
| 632 | /* We use these functions for IO */ |
| 633 | if (!mtd->read_oob || !mtd->write_oob) |
| 634 | return -ENODEV; |
| 635 | |
| 636 | /* Find geometry information */ |
| 637 | for (i = 0 ; i < ARRAY_SIZE(chs_table) ; i++) { |
| 638 | if (chs_table[i].size == size_in_megs) { |
| 639 | ftl->cylinders = chs_table[i].cyl; |
| 640 | ftl->heads = chs_table[i].head; |
| 641 | ftl->sectors = chs_table[i].sec; |
| 642 | return 0; |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | sm_printk("media has unknown size : %dMiB", size_in_megs); |
| 647 | ftl->cylinders = 985; |
| 648 | ftl->heads = 33; |
| 649 | ftl->sectors = 63; |
| 650 | return 0; |
| 651 | } |
| 652 | |
| 653 | /* Validate the CIS */ |
| 654 | static int sm_read_cis(struct sm_ftl *ftl) |
| 655 | { |
| 656 | struct sm_oob oob; |
| 657 | |
| 658 | if (sm_read_sector(ftl, |
| 659 | 0, ftl->cis_block, ftl->cis_boffset, ftl->cis_buffer, &oob)) |
| 660 | return -EIO; |
| 661 | |
| 662 | if (!sm_sector_valid(&oob) || !sm_block_valid(&oob)) |
| 663 | return -EIO; |
| 664 | |
| 665 | if (!memcmp(ftl->cis_buffer + ftl->cis_page_offset, |
| 666 | cis_signature, sizeof(cis_signature))) { |
| 667 | return 0; |
| 668 | } |
| 669 | |
| 670 | return -EIO; |
| 671 | } |
| 672 | |
| 673 | /* Scan the media for the CIS */ |
| 674 | static int sm_find_cis(struct sm_ftl *ftl) |
| 675 | { |
| 676 | struct sm_oob oob; |
| 677 | int block, boffset; |
| 678 | int block_found = 0; |
| 679 | int cis_found = 0; |
| 680 | |
| 681 | /* Search for first valid block */ |
| 682 | for (block = 0 ; block < ftl->zone_size - ftl->max_lba ; block++) { |
| 683 | |
| 684 | if (sm_read_sector(ftl, 0, block, 0, NULL, &oob)) |
| 685 | continue; |
| 686 | |
| 687 | if (!sm_block_valid(&oob)) |
| 688 | continue; |
| 689 | block_found = 1; |
| 690 | break; |
| 691 | } |
| 692 | |
| 693 | if (!block_found) |
| 694 | return -EIO; |
| 695 | |
| 696 | /* Search for first valid sector in this block */ |
| 697 | for (boffset = 0 ; boffset < ftl->block_size; |
| 698 | boffset += SM_SECTOR_SIZE) { |
| 699 | |
| 700 | if (sm_read_sector(ftl, 0, block, boffset, NULL, &oob)) |
| 701 | continue; |
| 702 | |
| 703 | if (!sm_sector_valid(&oob)) |
| 704 | continue; |
| 705 | break; |
| 706 | } |
| 707 | |
| 708 | if (boffset == ftl->block_size) |
| 709 | return -EIO; |
| 710 | |
| 711 | ftl->cis_block = block; |
| 712 | ftl->cis_boffset = boffset; |
| 713 | ftl->cis_page_offset = 0; |
| 714 | |
| 715 | cis_found = !sm_read_cis(ftl); |
| 716 | |
| 717 | if (!cis_found) { |
| 718 | ftl->cis_page_offset = SM_SMALL_PAGE; |
| 719 | cis_found = !sm_read_cis(ftl); |
| 720 | } |
| 721 | |
| 722 | if (cis_found) { |
| 723 | dbg("CIS block found at offset %x", |
| 724 | block * ftl->block_size + |
| 725 | boffset + ftl->cis_page_offset); |
| 726 | return 0; |
| 727 | } |
| 728 | return -EIO; |
| 729 | } |
| 730 | |
| 731 | /* Basic test to determine if underlying mtd device if functional */ |
| 732 | static int sm_recheck_media(struct sm_ftl *ftl) |
| 733 | { |
| 734 | if (sm_read_cis(ftl)) { |
| 735 | |
| 736 | if (!ftl->unstable) { |
| 737 | sm_printk("media unstable, not allowing writes"); |
| 738 | ftl->unstable = 1; |
| 739 | } |
| 740 | return -EIO; |
| 741 | } |
| 742 | return 0; |
| 743 | } |
| 744 | |
| 745 | /* Initialize a FTL zone */ |
| 746 | static int sm_init_zone(struct sm_ftl *ftl, int zone_num) |
| 747 | { |
| 748 | struct ftl_zone *zone = &ftl->zones[zone_num]; |
| 749 | struct sm_oob oob; |
| 750 | uint16_t block; |
| 751 | int lba; |
| 752 | int i = 0; |
Maxim Levitsky | 133fa8c | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 753 | int len; |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 754 | |
| 755 | dbg("initializing zone %d", zone_num); |
| 756 | |
| 757 | /* Allocate memory for FTL table */ |
| 758 | zone->lba_to_phys_table = kmalloc(ftl->max_lba * 2, GFP_KERNEL); |
| 759 | |
| 760 | if (!zone->lba_to_phys_table) |
| 761 | return -ENOMEM; |
| 762 | memset(zone->lba_to_phys_table, -1, ftl->max_lba * 2); |
| 763 | |
| 764 | |
| 765 | /* Allocate memory for free sectors FIFO */ |
| 766 | if (kfifo_alloc(&zone->free_sectors, ftl->zone_size * 2, GFP_KERNEL)) { |
| 767 | kfree(zone->lba_to_phys_table); |
| 768 | return -ENOMEM; |
| 769 | } |
| 770 | |
| 771 | /* Now scan the zone */ |
| 772 | for (block = 0 ; block < ftl->zone_size ; block++) { |
| 773 | |
| 774 | /* Skip blocks till the CIS (including) */ |
| 775 | if (zone_num == 0 && block <= ftl->cis_block) |
| 776 | continue; |
| 777 | |
| 778 | /* Read the oob of first sector */ |
| 779 | if (sm_read_sector(ftl, zone_num, block, 0, NULL, &oob)) |
| 780 | return -EIO; |
| 781 | |
| 782 | /* Test to see if block is erased. It is enough to test |
| 783 | first sector, because erase happens in one shot */ |
| 784 | if (sm_block_erased(&oob)) { |
| 785 | kfifo_in(&zone->free_sectors, |
| 786 | (unsigned char *)&block, 2); |
| 787 | continue; |
| 788 | } |
| 789 | |
| 790 | /* If block is marked as bad, skip it */ |
| 791 | /* This assumes we can trust first sector*/ |
| 792 | /* However the way the block valid status is defined, ensures |
| 793 | very low probability of failure here */ |
| 794 | if (!sm_block_valid(&oob)) { |
| 795 | dbg("PH %04d <-> <marked bad>", block); |
| 796 | continue; |
| 797 | } |
| 798 | |
| 799 | |
| 800 | lba = sm_read_lba(&oob); |
| 801 | |
| 802 | /* Invalid LBA means that block is damaged. */ |
| 803 | /* We can try to erase it, or mark it as bad, but |
| 804 | lets leave that to recovery application */ |
| 805 | if (lba == -2 || lba >= ftl->max_lba) { |
| 806 | dbg("PH %04d <-> LBA %04d(bad)", block, lba); |
| 807 | continue; |
| 808 | } |
| 809 | |
| 810 | |
| 811 | /* If there is no collision, |
| 812 | just put the sector in the FTL table */ |
| 813 | if (zone->lba_to_phys_table[lba] < 0) { |
| 814 | dbg_verbose("PH %04d <-> LBA %04d", block, lba); |
| 815 | zone->lba_to_phys_table[lba] = block; |
| 816 | continue; |
| 817 | } |
| 818 | |
| 819 | sm_printk("collision" |
| 820 | " of LBA %d between blocks %d and %d in zone %d", |
| 821 | lba, zone->lba_to_phys_table[lba], block, zone_num); |
| 822 | |
| 823 | /* Test that this block is valid*/ |
| 824 | if (sm_check_block(ftl, zone_num, block)) |
| 825 | continue; |
| 826 | |
| 827 | /* Test now the old block */ |
| 828 | if (sm_check_block(ftl, zone_num, |
| 829 | zone->lba_to_phys_table[lba])) { |
| 830 | zone->lba_to_phys_table[lba] = block; |
| 831 | continue; |
| 832 | } |
| 833 | |
| 834 | /* If both blocks are valid and share same LBA, it means that |
| 835 | they hold different versions of same data. It not |
| 836 | known which is more recent, thus just erase one of them |
| 837 | */ |
| 838 | sm_printk("both blocks are valid, erasing the later"); |
| 839 | sm_erase_block(ftl, zone_num, block, 1); |
| 840 | } |
| 841 | |
| 842 | dbg("zone initialized"); |
| 843 | zone->initialized = 1; |
| 844 | |
| 845 | /* No free sectors, means that the zone is heavily damaged, write won't |
| 846 | work, but it can still can be (partially) read */ |
| 847 | if (!kfifo_len(&zone->free_sectors)) { |
| 848 | sm_printk("no free blocks in zone %d", zone_num); |
| 849 | return 0; |
| 850 | } |
| 851 | |
| 852 | /* Randomize first block we write to */ |
| 853 | get_random_bytes(&i, 2); |
| 854 | i %= (kfifo_len(&zone->free_sectors) / 2); |
| 855 | |
| 856 | while (i--) { |
Maxim Levitsky | 133fa8c | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 857 | len = kfifo_out(&zone->free_sectors, |
| 858 | (unsigned char *)&block, 2); |
| 859 | WARN_ON(len != 2); |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 860 | kfifo_in(&zone->free_sectors, (const unsigned char *)&block, 2); |
| 861 | } |
| 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | /* Get and automaticly initialize an FTL mapping for one zone */ |
| 866 | struct ftl_zone *sm_get_zone(struct sm_ftl *ftl, int zone_num) |
| 867 | { |
| 868 | struct ftl_zone *zone; |
| 869 | int error; |
| 870 | |
| 871 | BUG_ON(zone_num >= ftl->zone_count); |
| 872 | zone = &ftl->zones[zone_num]; |
| 873 | |
| 874 | if (!zone->initialized) { |
| 875 | error = sm_init_zone(ftl, zone_num); |
| 876 | |
| 877 | if (error) |
| 878 | return ERR_PTR(error); |
| 879 | } |
| 880 | return zone; |
| 881 | } |
| 882 | |
| 883 | |
| 884 | /* ----------------- cache handling ------------------------------------------*/ |
| 885 | |
| 886 | /* Initialize the one block cache */ |
| 887 | void sm_cache_init(struct sm_ftl *ftl) |
| 888 | { |
| 889 | ftl->cache_data_invalid_bitmap = 0xFFFFFFFF; |
| 890 | ftl->cache_clean = 1; |
| 891 | ftl->cache_zone = -1; |
| 892 | ftl->cache_block = -1; |
| 893 | /*memset(ftl->cache_data, 0xAA, ftl->block_size);*/ |
| 894 | } |
| 895 | |
| 896 | /* Put sector in one block cache */ |
| 897 | void sm_cache_put(struct sm_ftl *ftl, char *buffer, int boffset) |
| 898 | { |
| 899 | memcpy(ftl->cache_data + boffset, buffer, SM_SECTOR_SIZE); |
| 900 | clear_bit(boffset / SM_SECTOR_SIZE, &ftl->cache_data_invalid_bitmap); |
| 901 | ftl->cache_clean = 0; |
| 902 | } |
| 903 | |
| 904 | /* Read a sector from the cache */ |
| 905 | int sm_cache_get(struct sm_ftl *ftl, char *buffer, int boffset) |
| 906 | { |
| 907 | if (test_bit(boffset / SM_SECTOR_SIZE, |
| 908 | &ftl->cache_data_invalid_bitmap)) |
| 909 | return -1; |
| 910 | |
| 911 | memcpy(buffer, ftl->cache_data + boffset, SM_SECTOR_SIZE); |
| 912 | return 0; |
| 913 | } |
| 914 | |
| 915 | /* Write the cache to hardware */ |
| 916 | int sm_cache_flush(struct sm_ftl *ftl) |
| 917 | { |
| 918 | struct ftl_zone *zone; |
| 919 | |
| 920 | int sector_num; |
| 921 | uint16_t write_sector; |
| 922 | int zone_num = ftl->cache_zone; |
| 923 | int block_num; |
| 924 | |
| 925 | if (ftl->cache_clean) |
| 926 | return 0; |
| 927 | |
| 928 | if (ftl->unstable) |
| 929 | return -EIO; |
| 930 | |
| 931 | BUG_ON(zone_num < 0); |
| 932 | zone = &ftl->zones[zone_num]; |
| 933 | block_num = zone->lba_to_phys_table[ftl->cache_block]; |
| 934 | |
| 935 | |
| 936 | /* Try to read all unread areas of the cache block*/ |
Akinobu Mita | fed457a | 2010-04-05 13:53:35 -0700 | [diff] [blame] | 937 | for_each_set_bit(sector_num, &ftl->cache_data_invalid_bitmap, |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 938 | ftl->block_size / SM_SECTOR_SIZE) { |
| 939 | |
| 940 | if (!sm_read_sector(ftl, |
| 941 | zone_num, block_num, sector_num * SM_SECTOR_SIZE, |
| 942 | ftl->cache_data + sector_num * SM_SECTOR_SIZE, NULL)) |
| 943 | clear_bit(sector_num, |
| 944 | &ftl->cache_data_invalid_bitmap); |
| 945 | } |
| 946 | restart: |
| 947 | |
| 948 | if (ftl->unstable) |
| 949 | return -EIO; |
Maxim Levitsky | 133fa8c | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 950 | |
| 951 | /* If there are no spare blocks, */ |
| 952 | /* we could still continue by erasing/writing the current block, |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 953 | but for such worn out media it doesn't worth the trouble, |
| 954 | and the dangers */ |
Maxim Levitsky | 133fa8c | 2010-02-26 22:08:40 +0200 | [diff] [blame] | 955 | if (kfifo_out(&zone->free_sectors, |
| 956 | (unsigned char *)&write_sector, 2) != 2) { |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 957 | dbg("no free sectors for write!"); |
| 958 | return -EIO; |
| 959 | } |
| 960 | |
Maxim Levitsky | 7d17c02 | 2010-02-22 20:39:41 +0200 | [diff] [blame] | 961 | |
| 962 | if (sm_write_block(ftl, ftl->cache_data, zone_num, write_sector, |
| 963 | ftl->cache_block, ftl->cache_data_invalid_bitmap)) |
| 964 | goto restart; |
| 965 | |
| 966 | /* Update the FTL table */ |
| 967 | zone->lba_to_phys_table[ftl->cache_block] = write_sector; |
| 968 | |
| 969 | /* Write succesfull, so erase and free the old block */ |
| 970 | if (block_num > 0) |
| 971 | sm_erase_block(ftl, zone_num, block_num, 1); |
| 972 | |
| 973 | sm_cache_init(ftl); |
| 974 | return 0; |
| 975 | } |
| 976 | |
| 977 | |
| 978 | /* flush timer, runs a second after last write */ |
| 979 | static void sm_cache_flush_timer(unsigned long data) |
| 980 | { |
| 981 | struct sm_ftl *ftl = (struct sm_ftl *)data; |
| 982 | queue_work(cache_flush_workqueue, &ftl->flush_work); |
| 983 | } |
| 984 | |
| 985 | /* cache flush work, kicked by timer */ |
| 986 | static void sm_cache_flush_work(struct work_struct *work) |
| 987 | { |
| 988 | struct sm_ftl *ftl = container_of(work, struct sm_ftl, flush_work); |
| 989 | mutex_lock(&ftl->mutex); |
| 990 | sm_cache_flush(ftl); |
| 991 | mutex_unlock(&ftl->mutex); |
| 992 | return; |
| 993 | } |
| 994 | |
| 995 | /* ---------------- outside interface -------------------------------------- */ |
| 996 | |
| 997 | /* outside interface: read a sector */ |
| 998 | static int sm_read(struct mtd_blktrans_dev *dev, |
| 999 | unsigned long sect_no, char *buf) |
| 1000 | { |
| 1001 | struct sm_ftl *ftl = dev->priv; |
| 1002 | struct ftl_zone *zone; |
| 1003 | int error = 0, in_cache = 0; |
| 1004 | int zone_num, block, boffset; |
| 1005 | |
| 1006 | sm_break_offset(ftl, sect_no << 9, &zone_num, &block, &boffset); |
| 1007 | mutex_lock(&ftl->mutex); |
| 1008 | |
| 1009 | |
| 1010 | zone = sm_get_zone(ftl, zone_num); |
| 1011 | if (IS_ERR(zone)) { |
| 1012 | error = PTR_ERR(zone); |
| 1013 | goto unlock; |
| 1014 | } |
| 1015 | |
| 1016 | /* Have to look at cache first */ |
| 1017 | if (ftl->cache_zone == zone_num && ftl->cache_block == block) { |
| 1018 | in_cache = 1; |
| 1019 | if (!sm_cache_get(ftl, buf, boffset)) |
| 1020 | goto unlock; |
| 1021 | } |
| 1022 | |
| 1023 | /* Translate the block and return if doesn't exist in the table */ |
| 1024 | block = zone->lba_to_phys_table[block]; |
| 1025 | |
| 1026 | if (block == -1) { |
| 1027 | memset(buf, 0xFF, SM_SECTOR_SIZE); |
| 1028 | goto unlock; |
| 1029 | } |
| 1030 | |
| 1031 | if (sm_read_sector(ftl, zone_num, block, boffset, buf, NULL)) { |
| 1032 | error = -EIO; |
| 1033 | goto unlock; |
| 1034 | } |
| 1035 | |
| 1036 | if (in_cache) |
| 1037 | sm_cache_put(ftl, buf, boffset); |
| 1038 | unlock: |
| 1039 | mutex_unlock(&ftl->mutex); |
| 1040 | return error; |
| 1041 | } |
| 1042 | |
| 1043 | /* outside interface: write a sector */ |
| 1044 | static int sm_write(struct mtd_blktrans_dev *dev, |
| 1045 | unsigned long sec_no, char *buf) |
| 1046 | { |
| 1047 | struct sm_ftl *ftl = dev->priv; |
| 1048 | struct ftl_zone *zone; |
| 1049 | int error, zone_num, block, boffset; |
| 1050 | |
| 1051 | BUG_ON(ftl->readonly); |
| 1052 | sm_break_offset(ftl, sec_no << 9, &zone_num, &block, &boffset); |
| 1053 | |
| 1054 | /* No need in flush thread running now */ |
| 1055 | del_timer(&ftl->timer); |
| 1056 | mutex_lock(&ftl->mutex); |
| 1057 | |
| 1058 | zone = sm_get_zone(ftl, zone_num); |
| 1059 | if (IS_ERR(zone)) { |
| 1060 | error = PTR_ERR(zone); |
| 1061 | goto unlock; |
| 1062 | } |
| 1063 | |
| 1064 | /* If entry is not in cache, flush it */ |
| 1065 | if (ftl->cache_block != block || ftl->cache_zone != zone_num) { |
| 1066 | |
| 1067 | error = sm_cache_flush(ftl); |
| 1068 | if (error) |
| 1069 | goto unlock; |
| 1070 | |
| 1071 | ftl->cache_block = block; |
| 1072 | ftl->cache_zone = zone_num; |
| 1073 | } |
| 1074 | |
| 1075 | sm_cache_put(ftl, buf, boffset); |
| 1076 | unlock: |
| 1077 | mod_timer(&ftl->timer, jiffies + msecs_to_jiffies(cache_timeout)); |
| 1078 | mutex_unlock(&ftl->mutex); |
| 1079 | return error; |
| 1080 | } |
| 1081 | |
| 1082 | /* outside interface: flush everything */ |
| 1083 | static int sm_flush(struct mtd_blktrans_dev *dev) |
| 1084 | { |
| 1085 | struct sm_ftl *ftl = dev->priv; |
| 1086 | int retval; |
| 1087 | |
| 1088 | mutex_lock(&ftl->mutex); |
| 1089 | retval = sm_cache_flush(ftl); |
| 1090 | mutex_unlock(&ftl->mutex); |
| 1091 | return retval; |
| 1092 | } |
| 1093 | |
| 1094 | /* outside interface: device is released */ |
| 1095 | static int sm_release(struct mtd_blktrans_dev *dev) |
| 1096 | { |
| 1097 | struct sm_ftl *ftl = dev->priv; |
| 1098 | |
| 1099 | mutex_lock(&ftl->mutex); |
| 1100 | del_timer_sync(&ftl->timer); |
| 1101 | cancel_work_sync(&ftl->flush_work); |
| 1102 | sm_cache_flush(ftl); |
| 1103 | mutex_unlock(&ftl->mutex); |
| 1104 | return 0; |
| 1105 | } |
| 1106 | |
| 1107 | /* outside interface: get geometry */ |
| 1108 | static int sm_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo) |
| 1109 | { |
| 1110 | struct sm_ftl *ftl = dev->priv; |
| 1111 | geo->heads = ftl->heads; |
| 1112 | geo->sectors = ftl->sectors; |
| 1113 | geo->cylinders = ftl->cylinders; |
| 1114 | return 0; |
| 1115 | } |
| 1116 | |
| 1117 | /* external interface: main initialization function */ |
| 1118 | static void sm_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) |
| 1119 | { |
| 1120 | struct mtd_blktrans_dev *trans; |
| 1121 | struct sm_ftl *ftl; |
| 1122 | |
| 1123 | /* Allocate & initialize our private structure */ |
| 1124 | ftl = kzalloc(sizeof(struct sm_ftl), GFP_KERNEL); |
| 1125 | if (!ftl) |
| 1126 | goto error1; |
| 1127 | |
| 1128 | |
| 1129 | mutex_init(&ftl->mutex); |
| 1130 | setup_timer(&ftl->timer, sm_cache_flush_timer, (unsigned long)ftl); |
| 1131 | INIT_WORK(&ftl->flush_work, sm_cache_flush_work); |
| 1132 | init_completion(&ftl->erase_completion); |
| 1133 | |
| 1134 | /* Read media information */ |
| 1135 | if (sm_get_media_info(ftl, mtd)) { |
| 1136 | dbg("found unsupported mtd device, aborting"); |
| 1137 | goto error2; |
| 1138 | } |
| 1139 | |
| 1140 | |
| 1141 | /* Allocate temporary CIS buffer for read retry support */ |
| 1142 | ftl->cis_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL); |
| 1143 | if (!ftl->cis_buffer) |
| 1144 | goto error2; |
| 1145 | |
| 1146 | /* Allocate zone array, it will be initialized on demand */ |
| 1147 | ftl->zones = kzalloc(sizeof(struct ftl_zone) * ftl->zone_count, |
| 1148 | GFP_KERNEL); |
| 1149 | if (!ftl->zones) |
| 1150 | goto error3; |
| 1151 | |
| 1152 | /* Allocate the cache*/ |
| 1153 | ftl->cache_data = kzalloc(ftl->block_size, GFP_KERNEL); |
| 1154 | |
| 1155 | if (!ftl->cache_data) |
| 1156 | goto error4; |
| 1157 | |
| 1158 | sm_cache_init(ftl); |
| 1159 | |
| 1160 | |
| 1161 | /* Allocate upper layer structure and initialize it */ |
| 1162 | trans = kzalloc(sizeof(struct mtd_blktrans_dev), GFP_KERNEL); |
| 1163 | if (!trans) |
| 1164 | goto error5; |
| 1165 | |
| 1166 | ftl->trans = trans; |
| 1167 | trans->priv = ftl; |
| 1168 | |
| 1169 | trans->tr = tr; |
| 1170 | trans->mtd = mtd; |
| 1171 | trans->devnum = -1; |
| 1172 | trans->size = (ftl->block_size * ftl->max_lba * ftl->zone_count) >> 9; |
| 1173 | trans->readonly = ftl->readonly; |
| 1174 | |
| 1175 | if (sm_find_cis(ftl)) { |
| 1176 | dbg("CIS not found on mtd device, aborting"); |
| 1177 | goto error6; |
| 1178 | } |
| 1179 | |
| 1180 | ftl->disk_attributes = sm_create_sysfs_attributes(ftl); |
| 1181 | trans->disk_attributes = ftl->disk_attributes; |
| 1182 | |
| 1183 | sm_printk("Found %d MiB xD/SmartMedia FTL on mtd%d", |
| 1184 | (int)(mtd->size / (1024 * 1024)), mtd->index); |
| 1185 | |
| 1186 | dbg("FTL layout:"); |
| 1187 | dbg("%d zone(s), each consists of %d blocks (+%d spares)", |
| 1188 | ftl->zone_count, ftl->max_lba, |
| 1189 | ftl->zone_size - ftl->max_lba); |
| 1190 | dbg("each block consists of %d bytes", |
| 1191 | ftl->block_size); |
| 1192 | |
| 1193 | |
| 1194 | /* Register device*/ |
| 1195 | if (add_mtd_blktrans_dev(trans)) { |
| 1196 | dbg("error in mtdblktrans layer"); |
| 1197 | goto error6; |
| 1198 | } |
| 1199 | return; |
| 1200 | error6: |
| 1201 | kfree(trans); |
| 1202 | error5: |
| 1203 | kfree(ftl->cache_data); |
| 1204 | error4: |
| 1205 | kfree(ftl->zones); |
| 1206 | error3: |
| 1207 | kfree(ftl->cis_buffer); |
| 1208 | error2: |
| 1209 | kfree(ftl); |
| 1210 | error1: |
| 1211 | return; |
| 1212 | } |
| 1213 | |
| 1214 | /* main interface: device {surprise,} removal */ |
| 1215 | static void sm_remove_dev(struct mtd_blktrans_dev *dev) |
| 1216 | { |
| 1217 | struct sm_ftl *ftl = dev->priv; |
| 1218 | int i; |
| 1219 | |
| 1220 | del_mtd_blktrans_dev(dev); |
| 1221 | ftl->trans = NULL; |
| 1222 | |
| 1223 | for (i = 0 ; i < ftl->zone_count; i++) { |
| 1224 | |
| 1225 | if (!ftl->zones[i].initialized) |
| 1226 | continue; |
| 1227 | |
| 1228 | kfree(ftl->zones[i].lba_to_phys_table); |
| 1229 | kfifo_free(&ftl->zones[i].free_sectors); |
| 1230 | } |
| 1231 | |
| 1232 | sm_delete_sysfs_attributes(ftl); |
| 1233 | kfree(ftl->cis_buffer); |
| 1234 | kfree(ftl->zones); |
| 1235 | kfree(ftl->cache_data); |
| 1236 | kfree(ftl); |
| 1237 | } |
| 1238 | |
| 1239 | static struct mtd_blktrans_ops sm_ftl_ops = { |
| 1240 | .name = "smblk", |
| 1241 | .major = -1, |
| 1242 | .part_bits = SM_FTL_PARTN_BITS, |
| 1243 | .blksize = SM_SECTOR_SIZE, |
| 1244 | .getgeo = sm_getgeo, |
| 1245 | |
| 1246 | .add_mtd = sm_add_mtd, |
| 1247 | .remove_dev = sm_remove_dev, |
| 1248 | |
| 1249 | .readsect = sm_read, |
| 1250 | .writesect = sm_write, |
| 1251 | |
| 1252 | .flush = sm_flush, |
| 1253 | .release = sm_release, |
| 1254 | |
| 1255 | .owner = THIS_MODULE, |
| 1256 | }; |
| 1257 | |
| 1258 | static __init int sm_module_init(void) |
| 1259 | { |
| 1260 | int error = 0; |
| 1261 | cache_flush_workqueue = create_freezeable_workqueue("smflush"); |
| 1262 | |
| 1263 | if (IS_ERR(cache_flush_workqueue)) |
| 1264 | return PTR_ERR(cache_flush_workqueue); |
| 1265 | |
| 1266 | error = register_mtd_blktrans(&sm_ftl_ops); |
| 1267 | if (error) |
| 1268 | destroy_workqueue(cache_flush_workqueue); |
| 1269 | return error; |
| 1270 | |
| 1271 | } |
| 1272 | |
| 1273 | static void __exit sm_module_exit(void) |
| 1274 | { |
| 1275 | destroy_workqueue(cache_flush_workqueue); |
| 1276 | deregister_mtd_blktrans(&sm_ftl_ops); |
| 1277 | } |
| 1278 | |
| 1279 | module_init(sm_module_init); |
| 1280 | module_exit(sm_module_exit); |
| 1281 | |
| 1282 | MODULE_LICENSE("GPL"); |
| 1283 | MODULE_AUTHOR("Maxim Levitsky <maximlevitsky@gmail.com>"); |
| 1284 | MODULE_DESCRIPTION("Smartmedia/xD mtd translation layer"); |