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   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright (C) 2005 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/sched.h>
  16 #include <linux/jiffies.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/mtd/onenand.h>
  19 #include <linux/mtd/partitions.h>
  20
  21 #include <asm/io.h>
  22
  23 /**
  24  * onenand_oob_64 - oob info for large (2KB) page
  25  */
  26 static struct nand_oobinfo onenand_oob_64 = {
  27         .useecc         = MTD_NANDECC_AUTOPLACE,
  28         .eccbytes       = 20,
  29         .eccpos         = {
  30                 8, 9, 10, 11, 12,
  31                 24, 25, 26, 27, 28,
  32                 40, 41, 42, 43, 44,
  33                 56, 57, 58, 59, 60,
  34                 },
  35         .oobfree        = {
  36                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  37                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  38         }
  39 };
  40
  41 /**
  42  * onenand_oob_32 - oob info for middle (1KB) page
  43  */
  44 static struct nand_oobinfo onenand_oob_32 = {
  45         .useecc         = MTD_NANDECC_AUTOPLACE,
  46         .eccbytes       = 10,
  47         .eccpos         = {
  48                 8, 9, 10, 11, 12,
  49                 24, 25, 26, 27, 28,
  50                 },
  51         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  52 };
  53
  54 static const unsigned char ffchars[] = {
  55         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  56         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  57         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  58         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  59         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  60         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  61         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  62         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
  63 };
  64
  65 /**
  66  * onenand_readw - [OneNAND Interface] Read OneNAND register
  67  * @param addr          address to read
  68  *
  69  * Read OneNAND register
  70  */
  71 static unsigned short onenand_readw(void __iomem *addr)
  72 {
  73         return readw(addr);
  74 }
  75
  76 /**
  77  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
  78  * @param value         value to write
  79  * @param addr          address to write
  80  *
  81  * Write OneNAND register with value
  82  */
  83 static void onenand_writew(unsigned short value, void __iomem *addr)
  84 {
  85         writew(value, addr);
  86 }
  87
  88 /**
  89  * onenand_block_address - [DEFAULT] Get block address
  90  * @param this          onenand chip data structure
  91  * @param block         the block
  92  * @return              translated block address if DDP, otherwise same
  93  *
  94  * Setup Start Address 1 Register (F100h)
  95  */
  96 static int onenand_block_address(struct onenand_chip *this, int block)
  97 {
  98         if (this->device_id & ONENAND_DEVICE_IS_DDP) {
  99                 /* Device Flash Core select, NAND Flash Block Address */
 100                 int dfs = 0;
 101
 102                 if (block & this->density_mask)
 103                         dfs = 1;
 104
 105                 return (dfs << ONENAND_DDP_SHIFT) |
 106                         (block & (this->density_mask - 1));
 107         }
 108
 109         return block;
 110 }
 111
 112 /**
 113  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 114  * @param this          onenand chip data structure
 115  * @param block         the block
 116  * @return              set DBS value if DDP, otherwise 0
 117  *
 118  * Setup Start Address 2 Register (F101h) for DDP
 119  */
 120 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 121 {
 122         if (this->device_id & ONENAND_DEVICE_IS_DDP) {
 123                 /* Device BufferRAM Select */
 124                 int dbs = 0;
 125
 126                 if (block & this->density_mask)
 127                         dbs = 1;
 128
 129                 return (dbs << ONENAND_DDP_SHIFT);
 130         }
 131
 132         return 0;
 133 }
 134
 135 /**
 136  * onenand_page_address - [DEFAULT] Get page address
 137  * @param page          the page address
 138  * @param sector        the sector address
 139  * @return              combined page and sector address
 140  *
 141  * Setup Start Address 8 Register (F107h)
 142  */
 143 static int onenand_page_address(int page, int sector)
 144 {
 145         /* Flash Page Address, Flash Sector Address */
 146         int fpa, fsa;
 147
 148         fpa = page & ONENAND_FPA_MASK;
 149         fsa = sector & ONENAND_FSA_MASK;
 150
 151         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 152 }
 153
 154 /**
 155  * onenand_buffer_address - [DEFAULT] Get buffer address
 156  * @param dataram1      DataRAM index
 157  * @param sectors       the sector address
 158  * @param count         the number of sectors
 159  * @return              the start buffer value
 160  *
 161  * Setup Start Buffer Register (F200h)
 162  */
 163 static int onenand_buffer_address(int dataram1, int sectors, int count)
 164 {
 165         int bsa, bsc;
 166
 167         /* BufferRAM Sector Address */
 168         bsa = sectors & ONENAND_BSA_MASK;
 169
 170         if (dataram1)
 171                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 172         else
 173                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 174
 175         /* BufferRAM Sector Count */
 176         bsc = count & ONENAND_BSC_MASK;
 177
 178         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 179 }
 180
 181 /**
 182  * onenand_command - [DEFAULT] Send command to OneNAND device
 183  * @param mtd           MTD device structure
 184  * @param cmd           the command to be sent
 185  * @param addr          offset to read from or write to
 186  * @param len           number of bytes to read or write
 187  *
 188  * Send command to OneNAND device. This function is used for middle/large page
 189  * devices (1KB/2KB Bytes per page)
 190  */
 191 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 192 {
 193         struct onenand_chip *this = mtd->priv;
 194         int value, readcmd = 0, block_cmd = 0;
 195         int block, page;
 196         /* Now we use page size operation */
 197         int sectors = 4, count = 4;
 198
 199         /* Address translation */
 200         switch (cmd) {
 201         case ONENAND_CMD_UNLOCK:
 202         case ONENAND_CMD_LOCK:
 203         case ONENAND_CMD_LOCK_TIGHT:
 204                 block = -1;
 205                 page = -1;
 206                 break;
 207
 208         case ONENAND_CMD_ERASE:
 209         case ONENAND_CMD_BUFFERRAM:
 210         case ONENAND_CMD_OTP_ACCESS:
 211                 block_cmd = 1;
 212                 block = (int) (addr >> this->erase_shift);
 213                 page = -1;
 214                 break;
 215
 216         default:
 217                 block = (int) (addr >> this->erase_shift);
 218                 page = (int) (addr >> this->page_shift);
 219                 page &= this->page_mask;
 220                 break;
 221         }
 222
 223         /* NOTE: The setting order of the registers is very important! */
 224         if (cmd == ONENAND_CMD_BUFFERRAM) {
 225                 /* Select DataRAM for DDP */
 226                 value = onenand_bufferram_address(this, block);
 227                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 228
 229                 /* Switch to the next data buffer */
 230                 ONENAND_SET_NEXT_BUFFERRAM(this);
 231
 232                 return 0;
 233         }
 234
 235         if (block != -1) {
 236                 /* Write 'DFS, FBA' of Flash */
 237                 value = onenand_block_address(this, block);
 238                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 239
 240                 if (block_cmd) {
 241                         /* Select DataRAM for DDP */
 242                         value = onenand_bufferram_address(this, block);
 243                         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 244                 }
 245         }
 246
 247         if (page != -1) {
 248                 int dataram;
 249
 250                 switch (cmd) {
 251                 case ONENAND_CMD_READ:
 252                 case ONENAND_CMD_READOOB:
 253                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 254                         readcmd = 1;
 255                         break;
 256
 257                 default:
 258                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 259                         break;
 260                 }
 261
 262                 /* Write 'FPA, FSA' of Flash */
 263                 value = onenand_page_address(page, sectors);
 264                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 265
 266                 /* Write 'BSA, BSC' of DataRAM */
 267                 value = onenand_buffer_address(dataram, sectors, count);
 268                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 269
 270                 if (readcmd) {
 271                         /* Select DataRAM for DDP */
 272                         value = onenand_bufferram_address(this, block);
 273                         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 274                 }
 275         }
 276
 277         /* Interrupt clear */
 278         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 279
 280         /* Write command */
 281         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 282
 283         return 0;
 284 }
 285
 286 /**
 287  * onenand_wait - [DEFAULT] wait until the command is done
 288  * @param mtd           MTD device structure
 289  * @param state         state to select the max. timeout value
 290  *
 291  * Wait for command done. This applies to all OneNAND command
 292  * Read can take up to 30us, erase up to 2ms and program up to 350us
 293  * according to general OneNAND specs
 294  */
 295 static int onenand_wait(struct mtd_info *mtd, int state)
 296 {
 297         struct onenand_chip * this = mtd->priv;
 298         unsigned long timeout;
 299         unsigned int flags = ONENAND_INT_MASTER;
 300         unsigned int interrupt = 0;
 301         unsigned int ctrl, ecc;
 302
 303         /* The 20 msec is enough */
 304         timeout = jiffies + msecs_to_jiffies(20);
 305         while (time_before(jiffies, timeout)) {
 306                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 307
 308                 if (interrupt & flags)
 309                         break;
 310
 311                 if (state != FL_READING)
 312                         cond_resched();
 313                 touch_softlockup_watchdog();
 314         }
 315         /* To get correct interrupt status in timeout case */
 316         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 317
 318         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 319
 320         if (ctrl & ONENAND_CTRL_ERROR) {
 321                 /* It maybe occur at initial bad block */
 322                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
 323                 /* Clear other interrupt bits for preventing ECC error */
 324                 interrupt &= ONENAND_INT_MASTER;
 325         }
 326
 327         if (ctrl & ONENAND_CTRL_LOCK) {
 328                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
 329                 return -EACCES;
 330         }
 331
 332         if (interrupt & ONENAND_INT_READ) {
 333                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 334                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 335                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
 336                         return -EBADMSG;
 337                 }
 338         }
 339
 340         return 0;
 341 }
 342
 343 /**
 344  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 345  * @param mtd           MTD data structure
 346  * @param area          BufferRAM area
 347  * @return              offset given area
 348  *
 349  * Return BufferRAM offset given area
 350  */
 351 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 352 {
 353         struct onenand_chip *this = mtd->priv;
 354
 355         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 356                 if (area == ONENAND_DATARAM)
 357                         return mtd->writesize;
 358                 if (area == ONENAND_SPARERAM)
 359                         return mtd->oobsize;
 360         }
 361
 362         return 0;
 363 }
 364
 365 /**
 366  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 367  * @param mtd           MTD data structure
 368  * @param area          BufferRAM area
 369  * @param buffer        the databuffer to put/get data
 370  * @param offset        offset to read from or write to
 371  * @param count         number of bytes to read/write
 372  *
 373  * Read the BufferRAM area
 374  */
 375 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 376                 unsigned char *buffer, int offset, size_t count)
 377 {
 378         struct onenand_chip *this = mtd->priv;
 379         void __iomem *bufferram;
 380
 381         bufferram = this->base + area;
 382
 383         bufferram += onenand_bufferram_offset(mtd, area);
 384
 385         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 386                 unsigned short word;
 387
 388                 /* Align with word(16-bit) size */
 389                 count--;
 390
 391                 /* Read word and save byte */
 392                 word = this->read_word(bufferram + offset + count);
 393                 buffer[count] = (word & 0xff);
 394         }
 395
 396         memcpy(buffer, bufferram + offset, count);
 397
 398         return 0;
 399 }
 400
 401 /**
 402  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 403  * @param mtd           MTD data structure
 404  * @param area          BufferRAM area
 405  * @param buffer        the databuffer to put/get data
 406  * @param offset        offset to read from or write to
 407  * @param count         number of bytes to read/write
 408  *
 409  * Read the BufferRAM area with Sync. Burst Mode
 410  */
 411 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 412                 unsigned char *buffer, int offset, size_t count)
 413 {
 414         struct onenand_chip *this = mtd->priv;
 415         void __iomem *bufferram;
 416
 417         bufferram = this->base + area;
 418
 419         bufferram += onenand_bufferram_offset(mtd, area);
 420
 421         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 422
 423         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 424                 unsigned short word;
 425
 426                 /* Align with word(16-bit) size */
 427                 count--;
 428
 429                 /* Read word and save byte */
 430                 word = this->read_word(bufferram + offset + count);
 431                 buffer[count] = (word & 0xff);
 432         }
 433
 434         memcpy(buffer, bufferram + offset, count);
 435
 436         this->mmcontrol(mtd, 0);
 437
 438         return 0;
 439 }
 440
 441 /**
 442  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 443  * @param mtd           MTD data structure
 444  * @param area          BufferRAM area
 445  * @param buffer        the databuffer to put/get data
 446  * @param offset        offset to read from or write to
 447  * @param count         number of bytes to read/write
 448  *
 449  * Write the BufferRAM area
 450  */
 451 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 452                 const unsigned char *buffer, int offset, size_t count)
 453 {
 454         struct onenand_chip *this = mtd->priv;
 455         void __iomem *bufferram;
 456
 457         bufferram = this->base + area;
 458
 459         bufferram += onenand_bufferram_offset(mtd, area);
 460
 461         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 462                 unsigned short word;
 463                 int byte_offset;
 464
 465                 /* Align with word(16-bit) size */
 466                 count--;
 467
 468                 /* Calculate byte access offset */
 469                 byte_offset = offset + count;
 470
 471                 /* Read word and save byte */
 472                 word = this->read_word(bufferram + byte_offset);
 473                 word = (word & ~0xff) | buffer[count];
 474                 this->write_word(word, bufferram + byte_offset);
 475         }
 476
 477         memcpy(bufferram + offset, buffer, count);
 478
 479         return 0;
 480 }
 481
 482 /**
 483  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 484  * @param mtd           MTD data structure
 485  * @param addr          address to check
 486  * @return              1 if there are valid data, otherwise 0
 487  *
 488  * Check bufferram if there is data we required
 489  */
 490 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 491 {
 492         struct onenand_chip *this = mtd->priv;
 493         int block, page;
 494         int i;
 495
 496         block = (int) (addr >> this->erase_shift);
 497         page = (int) (addr >> this->page_shift);
 498         page &= this->page_mask;
 499
 500         i = ONENAND_CURRENT_BUFFERRAM(this);
 501
 502         /* Is there valid data? */
 503         if (this->bufferram[i].block == block &&
 504             this->bufferram[i].page == page &&
 505             this->bufferram[i].valid)
 506                 return 1;
 507
 508         return 0;
 509 }
 510
 511 /**
 512  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 513  * @param mtd           MTD data structure
 514  * @param addr          address to update
 515  * @param valid         valid flag
 516  *
 517  * Update BufferRAM information
 518  */
 519 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 520                 int valid)
 521 {
 522         struct onenand_chip *this = mtd->priv;
 523         int block, page;
 524         int i;
 525
 526         block = (int) (addr >> this->erase_shift);
 527         page = (int) (addr >> this->page_shift);
 528         page &= this->page_mask;
 529
 530         /* Invalidate BufferRAM */
 531         for (i = 0; i < MAX_BUFFERRAM; i++) {
 532                 if (this->bufferram[i].block == block &&
 533                     this->bufferram[i].page == page)
 534                         this->bufferram[i].valid = 0;
 535         }
 536
 537         /* Update BufferRAM */
 538         i = ONENAND_CURRENT_BUFFERRAM(this);
 539         this->bufferram[i].block = block;
 540         this->bufferram[i].page = page;
 541         this->bufferram[i].valid = valid;
 542
 543         return 0;
 544 }
 545
 546 /**
 547  * onenand_get_device - [GENERIC] Get chip for selected access
 548  * @param mtd           MTD device structure
 549  * @param new_state     the state which is requested
 550  *
 551  * Get the device and lock it for exclusive access
 552  */
 553 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 554 {
 555         struct onenand_chip *this = mtd->priv;
 556         DECLARE_WAITQUEUE(wait, current);
 557
 558         /*
 559          * Grab the lock and see if the device is available
 560          */
 561         while (1) {
 562                 spin_lock(&this->chip_lock);
 563                 if (this->state == FL_READY) {
 564                         this->state = new_state;
 565                         spin_unlock(&this->chip_lock);
 566                         break;
 567                 }
 568                 if (new_state == FL_PM_SUSPENDED) {
 569                         spin_unlock(&this->chip_lock);
 570                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 571                 }
 572                 set_current_state(TASK_UNINTERRUPTIBLE);
 573                 add_wait_queue(&this->wq, &wait);
 574                 spin_unlock(&this->chip_lock);
 575                 schedule();
 576                 remove_wait_queue(&this->wq, &wait);
 577         }
 578
 579         return 0;
 580 }
 581
 582 /**
 583  * onenand_release_device - [GENERIC] release chip
 584  * @param mtd           MTD device structure
 585  *
 586  * Deselect, release chip lock and wake up anyone waiting on the device
 587  */
 588 static void onenand_release_device(struct mtd_info *mtd)
 589 {
 590         struct onenand_chip *this = mtd->priv;
 591
 592         /* Release the chip */
 593         spin_lock(&this->chip_lock);
 594         this->state = FL_READY;
 595         wake_up(&this->wq);
 596         spin_unlock(&this->chip_lock);
 597 }
 598
 599 /**
 600  * onenand_read_ecc - [MTD Interface] Read data with ECC
 601  * @param mtd           MTD device structure
 602  * @param from          offset to read from
 603  * @param len           number of bytes to read
 604  * @param retlen        pointer to variable to store the number of read bytes
 605  * @param buf           the databuffer to put data
 606  * @param oob_buf       filesystem supplied oob data buffer
 607  * @param oobsel        oob selection structure
 608  *
 609  * OneNAND read with ECC
 610  */
 611 static int onenand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
 612         size_t *retlen, u_char *buf,
 613         u_char *oob_buf, struct nand_oobinfo *oobsel)
 614 {
 615         struct onenand_chip *this = mtd->priv;
 616         int read = 0, column;
 617         int thislen;
 618         int ret = 0;
 619
 620         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 621
 622         /* Do not allow reads past end of device */
 623         if ((from + len) > mtd->size) {
 624                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: Attempt read beyond end of device\n");
 625                 *retlen = 0;
 626                 return -EINVAL;
 627         }
 628
 629         /* Grab the lock and see if the device is available */
 630         onenand_get_device(mtd, FL_READING);
 631
 632         /* TODO handling oob */
 633
 634         while (read < len) {
 635                 thislen = min_t(int, mtd->writesize, len - read);
 636
 637                 column = from & (mtd->writesize - 1);
 638                 if (column + thislen > mtd->writesize)
 639                         thislen = mtd->writesize - column;
 640
 641                 if (!onenand_check_bufferram(mtd, from)) {
 642                         this->command(mtd, ONENAND_CMD_READ, from, mtd->writesize);
 643
 644                         ret = this->wait(mtd, FL_READING);
 645                         /* First copy data and check return value for ECC handling */
 646                         onenand_update_bufferram(mtd, from, 1);
 647                 }
 648
 649                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
 650
 651                 read += thislen;
 652
 653                 if (read == len)
 654                         break;
 655
 656                 if (ret) {
 657                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: read failed = %d\n", ret);
 658                         goto out;
 659                 }
 660
 661                 from += thislen;
 662                 buf += thislen;
 663         }
 664
 665 out:
 666         /* Deselect and wake up anyone waiting on the device */
 667         onenand_release_device(mtd);
 668
 669         /*
 670          * Return success, if no ECC failures, else -EBADMSG
 671          * fs driver will take care of that, because
 672          * retlen == desired len and result == -EBADMSG
 673          */
 674         *retlen = read;
 675         return ret;
 676 }
 677
 678 /**
 679  * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
 680  * @param mtd           MTD device structure
 681  * @param from          offset to read from
 682  * @param len           number of bytes to read
 683  * @param retlen        pointer to variable to store the number of read bytes
 684  * @param buf           the databuffer to put data
 685  *
 686  * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
 687 */
 688 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 689         size_t *retlen, u_char *buf)
 690 {
 691         return onenand_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
 692 }
 693
 694 /**
 695  * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
 696  * @param mtd           MTD device structure
 697  * @param from          offset to read from
 698  * @param len           number of bytes to read
 699  * @param retlen        pointer to variable to store the number of read bytes
 700  * @param buf           the databuffer to put data
 701  *
 702  * OneNAND read out-of-band data from the spare area
 703  */
 704 static int onenand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
 705         size_t *retlen, u_char *buf)
 706 {
 707         struct onenand_chip *this = mtd->priv;
 708         int read = 0, thislen, column;
 709         int ret = 0;
 710
 711         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 712
 713         /* Initialize return length value */
 714         *retlen = 0;
 715
 716         /* Do not allow reads past end of device */
 717         if (unlikely((from + len) > mtd->size)) {
 718                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n");
 719                 return -EINVAL;
 720         }
 721
 722         /* Grab the lock and see if the device is available */
 723         onenand_get_device(mtd, FL_READING);
 724
 725         column = from & (mtd->oobsize - 1);
 726
 727         while (read < len) {
 728                 thislen = mtd->oobsize - column;
 729                 thislen = min_t(int, thislen, len);
 730
 731                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 732
 733                 onenand_update_bufferram(mtd, from, 0);
 734
 735                 ret = this->wait(mtd, FL_READING);
 736                 /* First copy data and check return value for ECC handling */
 737
 738                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 739
 740                 read += thislen;
 741
 742                 if (read == len)
 743                         break;
 744
 745                 if (ret) {
 746                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
 747                         goto out;
 748                 }
 749
 750                 buf += thislen;
 751
 752                 /* Read more? */
 753                 if (read < len) {
 754                         /* Page size */
 755                         from += mtd->writesize;
 756                         column = 0;
 757                 }
 758         }
 759
 760 out:
 761         /* Deselect and wake up anyone waiting on the device */
 762         onenand_release_device(mtd);
 763
 764         *retlen = read;
 765         return ret;
 766 }
 767
 768 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
 769 /**
 770  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
 771  * @param mtd           MTD device structure
 772  * @param buf           the databuffer to verify
 773  * @param to            offset to read from
 774  * @param len           number of bytes to read and compare
 775  *
 776  */
 777 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to, int len)
 778 {
 779         struct onenand_chip *this = mtd->priv;
 780         char *readp = this->page_buf;
 781         int column = to & (mtd->oobsize - 1);
 782         int status, i;
 783
 784         this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
 785         onenand_update_bufferram(mtd, to, 0);
 786         status = this->wait(mtd, FL_READING);
 787         if (status)
 788                 return status;
 789
 790         this->read_bufferram(mtd, ONENAND_SPARERAM, readp, column, len);
 791
 792         for(i = 0; i < len; i++)
 793                 if (buf[i] != 0xFF && buf[i] != readp[i])
 794                         return -EBADMSG;
 795
 796         return 0;
 797 }
 798
 799 /**
 800  * onenand_verify_page - [GENERIC] verify the chip contents after a write
 801  * @param mtd           MTD device structure
 802  * @param buf           the databuffer to verify
 803  *
 804  * Check DataRAM area directly
 805  */
 806 static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
 807 {
 808         struct onenand_chip *this = mtd->priv;
 809         void __iomem *dataram0, *dataram1;
 810         int ret = 0;
 811
 812         this->command(mtd, ONENAND_CMD_READ, addr, mtd->writesize);
 813
 814         ret = this->wait(mtd, FL_READING);
 815         if (ret)
 816                 return ret;
 817
 818         onenand_update_bufferram(mtd, addr, 1);
 819
 820         /* Check, if the two dataram areas are same */
 821         dataram0 = this->base + ONENAND_DATARAM;
 822         dataram1 = dataram0 + mtd->writesize;
 823
 824         if (memcmp(dataram0, dataram1, mtd->writesize))
 825                 return -EBADMSG;
 826
 827         return 0;
 828 }
 829 #else
 830 #define onenand_verify_page(...)        (0)
 831 #define onenand_verify_oob(...)         (0)
 832 #endif
 833
 834 #define NOTALIGNED(x)   ((x & (mtd->writesize - 1)) != 0)
 835
 836 /**
 837  * onenand_write_ecc - [MTD Interface] OneNAND write with ECC
 838  * @param mtd           MTD device structure
 839  * @param to            offset to write to
 840  * @param len           number of bytes to write
 841  * @param retlen        pointer to variable to store the number of written bytes
 842  * @param buf           the data to write
 843  * @param eccbuf        filesystem supplied oob data buffer
 844  * @param oobsel        oob selection structure
 845  *
 846  * OneNAND write with ECC
 847  */
 848 static int onenand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
 849         size_t *retlen, const u_char *buf,
 850         u_char *eccbuf, struct nand_oobinfo *oobsel)
 851 {
 852         struct onenand_chip *this = mtd->priv;
 853         int written = 0;
 854         int ret = 0;
 855
 856         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 857
 858         /* Initialize retlen, in case of early exit */
 859         *retlen = 0;
 860
 861         /* Do not allow writes past end of device */
 862         if (unlikely((to + len) > mtd->size)) {
 863                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt write to past end of device\n");
 864                 return -EINVAL;
 865         }
 866
 867         /* Reject writes, which are not page aligned */
 868         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
 869                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt to write not page aligned data\n");
 870                 return -EINVAL;
 871         }
 872
 873         /* Grab the lock and see if the device is available */
 874         onenand_get_device(mtd, FL_WRITING);
 875
 876         /* Loop until all data write */
 877         while (written < len) {
 878                 int thislen = min_t(int, mtd->writesize, len - written);
 879
 880                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->writesize);
 881
 882                 this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
 883                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 884
 885                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
 886
 887                 onenand_update_bufferram(mtd, to, 1);
 888
 889                 ret = this->wait(mtd, FL_WRITING);
 890                 if (ret) {
 891                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: write filaed %d\n", ret);
 892                         goto out;
 893                 }
 894
 895                 written += thislen;
 896
 897                 /* Only check verify write turn on */
 898                 ret = onenand_verify_page(mtd, (u_char *) buf, to);
 899                 if (ret) {
 900                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: verify failed %d\n", ret);
 901                         goto out;
 902                 }
 903
 904                 if (written == len)
 905                         break;
 906
 907                 to += thislen;
 908                 buf += thislen;
 909         }
 910
 911 out:
 912         /* Deselect and wake up anyone waiting on the device */
 913         onenand_release_device(mtd);
 914
 915         *retlen = written;
 916
 917         return ret;
 918 }
 919
 920 /**
 921  * onenand_write - [MTD Interface] compability function for onenand_write_ecc
 922  * @param mtd           MTD device structure
 923  * @param to            offset to write to
 924  * @param len           number of bytes to write
 925  * @param retlen        pointer to variable to store the number of written bytes
 926  * @param buf           the data to write
 927  *
 928  * This function simply calls onenand_write_ecc
 929  * with oob buffer and oobsel = NULL
 930  */
 931 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
 932         size_t *retlen, const u_char *buf)
 933 {
 934         return onenand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL);
 935 }
 936
 937 /**
 938  * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
 939  * @param mtd           MTD device structure
 940  * @param to            offset to write to
 941  * @param len           number of bytes to write
 942  * @param retlen        pointer to variable to store the number of written bytes
 943  * @param buf           the data to write
 944  *
 945  * OneNAND write out-of-band
 946  */
 947 static int onenand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
 948         size_t *retlen, const u_char *buf)
 949 {
 950         struct onenand_chip *this = mtd->priv;
 951         int column, ret = 0;
 952         int written = 0;
 953
 954         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 955
 956         /* Initialize retlen, in case of early exit */
 957         *retlen = 0;
 958
 959         /* Do not allow writes past end of device */
 960         if (unlikely((to + len) > mtd->size)) {
 961                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n");
 962                 return -EINVAL;
 963         }
 964
 965         /* Grab the lock and see if the device is available */
 966         onenand_get_device(mtd, FL_WRITING);
 967
 968         /* Loop until all data write */
 969         while (written < len) {
 970                 int thislen = min_t(int, mtd->oobsize, len - written);
 971
 972                 column = to & (mtd->oobsize - 1);
 973
 974                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
 975
 976                 /* We send data to spare ram with oobsize
 977                  * to prevent byte access */
 978                 memset(this->page_buf, 0xff, mtd->oobsize);
 979                 memcpy(this->page_buf + column, buf, thislen);
 980                 this->write_bufferram(mtd, ONENAND_SPARERAM, this->page_buf, 0, mtd->oobsize);
 981
 982                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
 983
 984                 onenand_update_bufferram(mtd, to, 0);
 985
 986                 ret = this->wait(mtd, FL_WRITING);
 987                 if (ret) {
 988                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: write filaed %d\n", ret);
 989                         goto out;
 990                 }
 991
 992                 ret = onenand_verify_oob(mtd, buf, to, thislen);
 993                 if (ret) {
 994                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: verify failed %d\n", ret);
 995                         goto out;
 996                 }
 997
 998                 written += thislen;
 999
1000                 if (written == len)
1001                         break;
1002
1003                 to += thislen;
1004                 buf += thislen;
1005         }
1006
1007 out:
1008         /* Deselect and wake up anyone waiting on the device */
1009         onenand_release_device(mtd);
1010
1011         *retlen = written;
1012
1013         return ret;
1014 }
1015
1016 /**
1017  * onenand_writev_ecc - [MTD Interface] write with iovec with ecc
1018  * @param mtd           MTD device structure
1019  * @param vecs          the iovectors to write
1020  * @param count         number of vectors
1021  * @param to            offset to write to
1022  * @param retlen        pointer to variable to store the number of written bytes
1023  * @param eccbuf        filesystem supplied oob data buffer
1024  * @param oobsel        oob selection structure
1025  *
1026  * OneNAND write with iovec with ecc
1027  */
1028 static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
1029         unsigned long count, loff_t to, size_t *retlen,
1030         u_char *eccbuf, struct nand_oobinfo *oobsel)
1031 {
1032         struct onenand_chip *this = mtd->priv;
1033         unsigned char *pbuf;
1034         size_t total_len, len;
1035         int i, written = 0;
1036         int ret = 0;
1037
1038         /* Preset written len for early exit */
1039         *retlen = 0;
1040
1041         /* Calculate total length of data */
1042         total_len = 0;
1043         for (i = 0; i < count; i++)
1044                 total_len += vecs[i].iov_len;
1045
1046         DEBUG(MTD_DEBUG_LEVEL3, "onenand_writev_ecc: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count);
1047
1048         /* Do not allow write past end of the device */
1049         if (unlikely((to + total_len) > mtd->size)) {
1050                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempted write past end of device\n");
1051                 return -EINVAL;
1052         }
1053
1054         /* Reject writes, which are not page aligned */
1055         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(total_len))) {
1056                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempt to write not page aligned data\n");
1057                 return -EINVAL;
1058         }
1059
1060         /* Grab the lock and see if the device is available */
1061         onenand_get_device(mtd, FL_WRITING);
1062
1063         /* TODO handling oob */
1064
1065         /* Loop until all keve's data has been written */
1066         len = 0;
1067         while (count) {
1068                 pbuf = this->page_buf;
1069                 /*
1070                  * If the given tuple is >= pagesize then
1071                  * write it out from the iov
1072                  */
1073                 if ((vecs->iov_len - len) >= mtd->writesize) {
1074                         pbuf = vecs->iov_base + len;
1075
1076                         len += mtd->writesize;
1077
1078                         /* Check, if we have to switch to the next tuple */
1079                         if (len >= (int) vecs->iov_len) {
1080                                 vecs++;
1081                                 len = 0;
1082                                 count--;
1083                         }
1084                 } else {
1085                         int cnt = 0, thislen;
1086                         while (cnt < mtd->writesize) {
1087                                 thislen = min_t(int, mtd->writesize - cnt, vecs->iov_len - len);
1088                                 memcpy(this->page_buf + cnt, vecs->iov_base + len, thislen);
1089                                 cnt += thislen;
1090                                 len += thislen;
1091
1092                                 /* Check, if we have to switch to the next tuple */
1093                                 if (len >= (int) vecs->iov_len) {
1094                                         vecs++;
1095                                         len = 0;
1096                                         count--;
1097                                 }
1098                         }
1099                 }
1100
1101                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->writesize);
1102
1103                 this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->writesize);
1104                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
1105
1106                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1107
1108                 onenand_update_bufferram(mtd, to, 1);
1109
1110                 ret = this->wait(mtd, FL_WRITING);
1111                 if (ret) {
1112                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret);
1113                         goto out;
1114                 }
1115
1116
1117                 /* Only check verify write turn on */
1118                 ret = onenand_verify_page(mtd, (u_char *) pbuf, to);
1119                 if (ret) {
1120                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret);
1121                         goto out;
1122                 }
1123
1124                 written += mtd->writesize;
1125
1126                 to += mtd->writesize;
1127         }
1128
1129 out:
1130         /* Deselect and wakt up anyone waiting on the device */
1131         onenand_release_device(mtd);
1132
1133         *retlen = written;
1134
1135         return 0;
1136 }
1137
1138 /**
1139  * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc
1140  * @param mtd           MTD device structure
1141  * @param vecs          the iovectors to write
1142  * @param count         number of vectors
1143  * @param to            offset to write to
1144  * @param retlen        pointer to variable to store the number of written bytes
1145  *
1146  * OneNAND write with kvec. This just calls the ecc function
1147  */
1148 static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
1149         unsigned long count, loff_t to, size_t *retlen)
1150 {
1151         return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
1152 }
1153
1154 /**
1155  * onenand_block_checkbad - [GENERIC] Check if a block is marked bad
1156  * @param mtd           MTD device structure
1157  * @param ofs           offset from device start
1158  * @param getchip       0, if the chip is already selected
1159  * @param allowbbt      1, if its allowed to access the bbt area
1160  *
1161  * Check, if the block is bad. Either by reading the bad block table or
1162  * calling of the scan function.
1163  */
1164 static int onenand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt)
1165 {
1166         struct onenand_chip *this = mtd->priv;
1167         struct bbm_info *bbm = this->bbm;
1168
1169         /* Return info from the table */
1170         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1171 }
1172
1173 /**
1174  * onenand_erase - [MTD Interface] erase block(s)
1175  * @param mtd           MTD device structure
1176  * @param instr         erase instruction
1177  *
1178  * Erase one ore more blocks
1179  */
1180 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1181 {
1182         struct onenand_chip *this = mtd->priv;
1183         unsigned int block_size;
1184         loff_t addr;
1185         int len;
1186         int ret = 0;
1187
1188         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
1189
1190         block_size = (1 << this->erase_shift);
1191
1192         /* Start address must align on block boundary */
1193         if (unlikely(instr->addr & (block_size - 1))) {
1194                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
1195                 return -EINVAL;
1196         }
1197
1198         /* Length must align on block boundary */
1199         if (unlikely(instr->len & (block_size - 1))) {
1200                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n");
1201                 return -EINVAL;
1202         }
1203
1204         /* Do not allow erase past end of device */
1205         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1206                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n");
1207                 return -EINVAL;
1208         }
1209
1210         instr->fail_addr = 0xffffffff;
1211
1212         /* Grab the lock and see if the device is available */
1213         onenand_get_device(mtd, FL_ERASING);
1214
1215         /* Loop throught the pages */
1216         len = instr->len;
1217         addr = instr->addr;
1218
1219         instr->state = MTD_ERASING;
1220
1221         while (len) {
1222
1223                 /* Check if we have a bad block, we do not erase bad blocks */
1224                 if (onenand_block_checkbad(mtd, addr, 0, 0)) {
1225                         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
1226                         instr->state = MTD_ERASE_FAILED;
1227                         goto erase_exit;
1228                 }
1229
1230                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1231
1232                 ret = this->wait(mtd, FL_ERASING);
1233                 /* Check, if it is write protected */
1234                 if (ret) {
1235                         if (ret == -EPERM)
1236                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
1237                         else
1238                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
1239                         instr->state = MTD_ERASE_FAILED;
1240                         instr->fail_addr = addr;
1241                         goto erase_exit;
1242                 }
1243
1244                 len -= block_size;
1245                 addr += block_size;
1246         }
1247
1248         instr->state = MTD_ERASE_DONE;
1249
1250 erase_exit:
1251
1252         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1253         /* Do call back function */
1254         if (!ret)
1255                 mtd_erase_callback(instr);
1256
1257         /* Deselect and wake up anyone waiting on the device */
1258         onenand_release_device(mtd);
1259
1260         return ret;
1261 }
1262
1263 /**
1264  * onenand_sync - [MTD Interface] sync
1265  * @param mtd           MTD device structure
1266  *
1267  * Sync is actually a wait for chip ready function
1268  */
1269 static void onenand_sync(struct mtd_info *mtd)
1270 {
1271         DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1272
1273         /* Grab the lock and see if the device is available */
1274         onenand_get_device(mtd, FL_SYNCING);
1275
1276         /* Release it and go back */
1277         onenand_release_device(mtd);
1278 }
1279
1280
1281 /**
1282  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1283  * @param mtd           MTD device structure
1284  * @param ofs           offset relative to mtd start
1285  *
1286  * Check whether the block is bad
1287  */
1288 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1289 {
1290         /* Check for invalid offset */
1291         if (ofs > mtd->size)
1292                 return -EINVAL;
1293
1294         return onenand_block_checkbad(mtd, ofs, 1, 0);
1295 }
1296
1297 /**
1298  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1299  * @param mtd           MTD device structure
1300  * @param ofs           offset from device start
1301  *
1302  * This is the default implementation, which can be overridden by
1303  * a hardware specific driver.
1304  */
1305 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1306 {
1307         struct onenand_chip *this = mtd->priv;
1308         struct bbm_info *bbm = this->bbm;
1309         u_char buf[2] = {0, 0};
1310         size_t retlen;
1311         int block;
1312
1313         /* Get block number */
1314         block = ((int) ofs) >> bbm->bbt_erase_shift;
1315         if (bbm->bbt)
1316                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1317
1318         /* We write two bytes, so we dont have to mess with 16 bit access */
1319         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1320         return mtd->write_oob(mtd, ofs , 2, &retlen, buf);
1321 }
1322
1323 /**
1324  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1325  * @param mtd           MTD device structure
1326  * @param ofs           offset relative to mtd start
1327  *
1328  * Mark the block as bad
1329  */
1330 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1331 {
1332         struct onenand_chip *this = mtd->priv;
1333         int ret;
1334
1335         ret = onenand_block_isbad(mtd, ofs);
1336         if (ret) {
1337                 /* If it was bad already, return success and do nothing */
1338                 if (ret > 0)
1339                         return 0;
1340                 return ret;
1341         }
1342
1343         return this->block_markbad(mtd, ofs);
1344 }
1345
1346 /**
1347  * onenand_unlock - [MTD Interface] Unlock block(s)
1348  * @param mtd           MTD device structure
1349  * @param ofs           offset relative to mtd start
1350  * @param len           number of bytes to unlock
1351  *
1352  * Unlock one or more blocks
1353  */
1354 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1355 {
1356         struct onenand_chip *this = mtd->priv;
1357         int start, end, block, value, status;
1358
1359         start = ofs >> this->erase_shift;
1360         end = len >> this->erase_shift;
1361
1362         /* Continuous lock scheme */
1363         if (this->options & ONENAND_CONT_LOCK) {
1364                 /* Set start block address */
1365                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1366                 /* Set end block address */
1367                 this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1368                 /* Write unlock command */
1369                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1370
1371                 /* There's no return value */
1372                 this->wait(mtd, FL_UNLOCKING);
1373
1374                 /* Sanity check */
1375                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1376                     & ONENAND_CTRL_ONGO)
1377                         continue;
1378
1379                 /* Check lock status */
1380                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1381                 if (!(status & ONENAND_WP_US))
1382                         printk(KERN_ERR "wp status = 0x%x\n", status);
1383
1384                 return 0;
1385         }
1386
1387         /* Block lock scheme */
1388         for (block = start; block < end; block++) {
1389                 /* Set block address */
1390                 value = onenand_block_address(this, block);
1391                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1392                 /* Select DataRAM for DDP */
1393                 value = onenand_bufferram_address(this, block);
1394                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1395                 /* Set start block address */
1396                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1397                 /* Write unlock command */
1398                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1399
1400                 /* There's no return value */
1401                 this->wait(mtd, FL_UNLOCKING);
1402
1403                 /* Sanity check */
1404                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1405                     & ONENAND_CTRL_ONGO)
1406                         continue;
1407
1408                 /* Check lock status */
1409                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1410                 if (!(status & ONENAND_WP_US))
1411                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1412         }
1413
1414         return 0;
1415 }
1416
1417 #ifdef CONFIG_MTD_ONENAND_OTP
1418
1419 /* Interal OTP operation */
1420 typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
1421                 size_t *retlen, u_char *buf);
1422
1423 /**
1424  * do_otp_read - [DEFAULT] Read OTP block area
1425  * @param mtd           MTD device structure
1426  * @param from          The offset to read
1427  * @param len           number of bytes to read
1428  * @param retlen        pointer to variable to store the number of readbytes
1429  * @param buf           the databuffer to put/get data
1430  *
1431  * Read OTP block area.
1432  */
1433 static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
1434                 size_t *retlen, u_char *buf)
1435 {
1436         struct onenand_chip *this = mtd->priv;
1437         int ret;
1438
1439         /* Enter OTP access mode */
1440         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
1441         this->wait(mtd, FL_OTPING);
1442
1443         ret = mtd->read(mtd, from, len, retlen, buf);
1444
1445         /* Exit OTP access mode */
1446         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
1447         this->wait(mtd, FL_RESETING);
1448
1449         return ret;
1450 }
1451
1452 /**
1453  * do_otp_write - [DEFAULT] Write OTP block area
1454  * @param mtd           MTD device structure
1455  * @param from          The offset to write
1456  * @param len           number of bytes to write
1457  * @param retlen        pointer to variable to store the number of write bytes
1458  * @param buf           the databuffer to put/get data
1459  *
1460  * Write OTP block area.
1461  */
1462 static int do_otp_write(struct mtd_info *mtd, loff_t from, size_t len,
1463                 size_t *retlen, u_char *buf)
1464 {
1465         struct onenand_chip *this = mtd->priv;
1466         unsigned char *pbuf = buf;
1467         int ret;
1468
1469         /* Force buffer page aligned */
1470         if (len < mtd->writesize) {
1471                 memcpy(this->page_buf, buf, len);
1472                 memset(this->page_buf + len, 0xff, mtd->writesize - len);
1473                 pbuf = this->page_buf;
1474                 len = mtd->writesize;
1475         }
1476
1477         /* Enter OTP access mode */
1478         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
1479         this->wait(mtd, FL_OTPING);
1480
1481         ret = mtd->write(mtd, from, len, retlen, pbuf);
1482
1483         /* Exit OTP access mode */
1484         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
1485         this->wait(mtd, FL_RESETING);
1486
1487         return ret;
1488 }
1489
1490 /**
1491  * do_otp_lock - [DEFAULT] Lock OTP block area
1492  * @param mtd           MTD device structure
1493  * @param from          The offset to lock
1494  * @param len           number of bytes to lock
1495  * @param retlen        pointer to variable to store the number of lock bytes
1496  * @param buf           the databuffer to put/get data
1497  *
1498  * Lock OTP block area.
1499  */
1500 static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
1501                 size_t *retlen, u_char *buf)
1502 {
1503         struct onenand_chip *this = mtd->priv;
1504         int ret;
1505
1506         /* Enter OTP access mode */
1507         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
1508         this->wait(mtd, FL_OTPING);
1509
1510         ret = mtd->write_oob(mtd, from, len, retlen, buf);
1511
1512         /* Exit OTP access mode */
1513         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
1514         this->wait(mtd, FL_RESETING);
1515
1516         return ret;
1517 }
1518
1519 /**
1520  * onenand_otp_walk - [DEFAULT] Handle OTP operation
1521  * @param mtd           MTD device structure
1522  * @param from          The offset to read/write
1523  * @param len           number of bytes to read/write
1524  * @param retlen        pointer to variable to store the number of read bytes
1525  * @param buf           the databuffer to put/get data
1526  * @param action        do given action
1527  * @param mode          specify user and factory
1528  *
1529  * Handle OTP operation.
1530  */
1531 static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
1532                         size_t *retlen, u_char *buf,
1533                         otp_op_t action, int mode)
1534 {
1535         struct onenand_chip *this = mtd->priv;
1536         int otp_pages;
1537         int density;
1538         int ret = 0;
1539
1540         *retlen = 0;
1541
1542         density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1543         if (density < ONENAND_DEVICE_DENSITY_512Mb)
1544                 otp_pages = 20;
1545         else
1546                 otp_pages = 10;
1547
1548         if (mode == MTD_OTP_FACTORY) {
1549                 from += mtd->writesize * otp_pages;
1550                 otp_pages = 64 - otp_pages;
1551         }
1552
1553         /* Check User/Factory boundary */
1554         if (((mtd->writesize * otp_pages) - (from + len)) < 0)
1555                 return 0;
1556
1557         while (len > 0 && otp_pages > 0) {
1558                 if (!action) {  /* OTP Info functions */
1559                         struct otp_info *otpinfo;
1560
1561                         len -= sizeof(struct otp_info);
1562                         if (len <= 0)
1563                                 return -ENOSPC;
1564
1565                         otpinfo = (struct otp_info *) buf;
1566                         otpinfo->start = from;
1567                         otpinfo->length = mtd->writesize;
1568                         otpinfo->locked = 0;
1569
1570                         from += mtd->writesize;
1571                         buf += sizeof(struct otp_info);
1572                         *retlen += sizeof(struct otp_info);
1573                 } else {
1574                         size_t tmp_retlen;
1575                         int size = len;
1576
1577                         ret = action(mtd, from, len, &tmp_retlen, buf);
1578
1579                         buf += size;
1580                         len -= size;
1581                         *retlen += size;
1582
1583                         if (ret < 0)
1584                                 return ret;
1585                 }
1586                 otp_pages--;
1587         }
1588
1589         return 0;
1590 }
1591
1592 /**
1593  * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
1594  * @param mtd           MTD device structure
1595  * @param buf           the databuffer to put/get data
1596  * @param len           number of bytes to read
1597  *
1598  * Read factory OTP info.
1599  */
1600 static int onenand_get_fact_prot_info(struct mtd_info *mtd,
1601                         struct otp_info *buf, size_t len)
1602 {
1603         size_t retlen;
1604         int ret;
1605
1606         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);
1607
1608         return ret ? : retlen;
1609 }
1610
1611 /**
1612  * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
1613  * @param mtd           MTD device structure
1614  * @param from          The offset to read
1615  * @param len           number of bytes to read
1616  * @param retlen        pointer to variable to store the number of read bytes
1617  * @param buf           the databuffer to put/get data
1618  *
1619  * Read factory OTP area.
1620  */
1621 static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
1622                         size_t len, size_t *retlen, u_char *buf)
1623 {
1624         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
1625 }
1626
1627 /**
1628  * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
1629  * @param mtd           MTD device structure
1630  * @param buf           the databuffer to put/get data
1631  * @param len           number of bytes to read
1632  *
1633  * Read user OTP info.
1634  */
1635 static int onenand_get_user_prot_info(struct mtd_info *mtd,
1636                         struct otp_info *buf, size_t len)
1637 {
1638         size_t retlen;
1639         int ret;
1640
1641         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);
1642
1643         return ret ? : retlen;
1644 }
1645
1646 /**
1647  * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
1648  * @param mtd           MTD device structure
1649  * @param from          The offset to read
1650  * @param len           number of bytes to read
1651  * @param retlen        pointer to variable to store the number of read bytes
1652  * @param buf           the databuffer to put/get data
1653  *
1654  * Read user OTP area.
1655  */
1656 static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
1657                         size_t len, size_t *retlen, u_char *buf)
1658 {
1659         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
1660 }
1661
1662 /**
1663  * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
1664  * @param mtd           MTD device structure
1665  * @param from          The offset to write
1666  * @param len           number of bytes to write
1667  * @param retlen        pointer to variable to store the number of write bytes
1668  * @param buf           the databuffer to put/get data
1669  *
1670  * Write user OTP area.
1671  */
1672 static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
1673                         size_t len, size_t *retlen, u_char *buf)
1674 {
1675         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
1676 }
1677
1678 /**
1679  * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
1680  * @param mtd           MTD device structure
1681  * @param from          The offset to lock
1682  * @param len           number of bytes to unlock
1683  *
1684  * Write lock mark on spare area in page 0 in OTP block
1685  */
1686 static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
1687                         size_t len)
1688 {
1689         unsigned char oob_buf[64];
1690         size_t retlen;
1691         int ret;
1692
1693         memset(oob_buf, 0xff, mtd->oobsize);
1694         /*
1695          * Note: OTP lock operation
1696          *       OTP block : 0xXXFC
1697          *       1st block : 0xXXF3 (If chip support)
1698          *       Both      : 0xXXF0 (If chip support)
1699          */
1700         oob_buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
1701
1702         /*
1703          * Write lock mark to 8th word of sector0 of page0 of the spare0.
1704          * We write 16 bytes spare area instead of 2 bytes.
1705          */
1706         from = 0;
1707         len = 16;
1708
1709         ret = onenand_otp_walk(mtd, from, len, &retlen, oob_buf, do_otp_lock, MTD_OTP_USER);
1710
1711         return ret ? : retlen;
1712 }
1713 #endif  /* CONFIG_MTD_ONENAND_OTP */
1714
1715 /**
1716  * onenand_print_device_info - Print device ID
1717  * @param device        device ID
1718  *
1719  * Print device ID
1720  */
1721 static void onenand_print_device_info(int device)
1722 {
1723         int vcc, demuxed, ddp, density;
1724
1725         vcc = device & ONENAND_DEVICE_VCC_MASK;
1726         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
1727         ddp = device & ONENAND_DEVICE_IS_DDP;
1728         density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
1729         printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
1730                 demuxed ? "" : "Muxed ",
1731                 ddp ? "(DDP)" : "",
1732                 (16 << density),
1733                 vcc ? "2.65/3.3" : "1.8",
1734                 device);
1735 }
1736
1737 static const struct onenand_manufacturers onenand_manuf_ids[] = {
1738         {ONENAND_MFR_SAMSUNG, "Samsung"},
1739 };
1740
1741 /**
1742  * onenand_check_maf - Check manufacturer ID
1743  * @param manuf         manufacturer ID
1744  *
1745  * Check manufacturer ID
1746  */
1747 static int onenand_check_maf(int manuf)
1748 {
1749         int size = ARRAY_SIZE(onenand_manuf_ids);
1750         char *name;
1751         int i;
1752
1753         for (i = 0; i < size; i++)
1754                 if (manuf == onenand_manuf_ids[i].id)
1755                         break;
1756
1757         if (i < size)
1758                 name = onenand_manuf_ids[i].name;
1759         else
1760                 name = "Unknown";
1761
1762         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
1763
1764         return (i == size);
1765 }
1766
1767 /**
1768  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
1769  * @param mtd           MTD device structure
1770  *
1771  * OneNAND detection method:
1772  *   Compare the the values from command with ones from register
1773  */
1774 static int onenand_probe(struct mtd_info *mtd)
1775 {
1776         struct onenand_chip *this = mtd->priv;
1777         int bram_maf_id, bram_dev_id, maf_id, dev_id;
1778         int version_id;
1779         int density;
1780
1781         /* Send the command for reading device ID from BootRAM */
1782         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
1783
1784         /* Read manufacturer and device IDs from BootRAM */
1785         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
1786         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
1787
1788         /* Check manufacturer ID */
1789         if (onenand_check_maf(bram_maf_id))
1790                 return -ENXIO;
1791
1792         /* Reset OneNAND to read default register values */
1793         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
1794
1795         /* Read manufacturer and device IDs from Register */
1796         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
1797         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
1798
1799         /* Check OneNAND device */
1800         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
1801                 return -ENXIO;
1802
1803         /* Flash device information */
1804         onenand_print_device_info(dev_id);
1805         this->device_id = dev_id;
1806
1807         density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1808         this->chipsize = (16 << density) << 20;
1809         /* Set density mask. it is used for DDP */
1810         this->density_mask = (1 << (density + 6));
1811
1812         /* OneNAND page size & block size */
1813         /* The data buffer size is equal to page size */
1814         mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
1815         mtd->oobsize = mtd->writesize >> 5;
1816         /* Pagers per block is always 64 in OneNAND */
1817         mtd->erasesize = mtd->writesize << 6;
1818
1819         this->erase_shift = ffs(mtd->erasesize) - 1;
1820         this->page_shift = ffs(mtd->writesize) - 1;
1821         this->ppb_shift = (this->erase_shift - this->page_shift);
1822         this->page_mask = (mtd->erasesize / mtd->writesize) - 1;
1823
1824         /* REVIST: Multichip handling */
1825
1826         mtd->size = this->chipsize;
1827
1828         /* Version ID */
1829         version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
1830         printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);
1831
1832         /* Lock scheme */
1833         if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
1834             !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
1835                 printk(KERN_INFO "Lock scheme is Continues Lock\n");
1836                 this->options |= ONENAND_CONT_LOCK;
1837         }
1838
1839         return 0;
1840 }
1841
1842 /**
1843  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
1844  * @param mtd           MTD device structure
1845  */
1846 static int onenand_suspend(struct mtd_info *mtd)
1847 {
1848         return onenand_get_device(mtd, FL_PM_SUSPENDED);
1849 }
1850
1851 /**
1852  * onenand_resume - [MTD Interface] Resume the OneNAND flash
1853  * @param mtd           MTD device structure
1854  */
1855 static void onenand_resume(struct mtd_info *mtd)
1856 {
1857         struct onenand_chip *this = mtd->priv;
1858
1859         if (this->state == FL_PM_SUSPENDED)
1860                 onenand_release_device(mtd);
1861         else
1862                 printk(KERN_ERR "resume() called for the chip which is not"
1863                                 "in suspended state\n");
1864 }
1865
1866 /**
1867  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
1868  * @param mtd           MTD device structure
1869  * @param maxchips      Number of chips to scan for
1870  *
1871  * This fills out all the not initialized function pointers
1872  * with the defaults.
1873  * The flash ID is read and the mtd/chip structures are
1874  * filled with the appropriate values.
1875  */
1876 int onenand_scan(struct mtd_info *mtd, int maxchips)
1877 {
1878         struct onenand_chip *this = mtd->priv;
1879
1880         if (!this->read_word)
1881                 this->read_word = onenand_readw;
1882         if (!this->write_word)
1883                 this->write_word = onenand_writew;
1884
1885         if (!this->command)
1886                 this->command = onenand_command;
1887         if (!this->wait)
1888                 this->wait = onenand_wait;
1889
1890         if (!this->read_bufferram)
1891                 this->read_bufferram = onenand_read_bufferram;
1892         if (!this->write_bufferram)
1893                 this->write_bufferram = onenand_write_bufferram;
1894
1895         if (!this->block_markbad)
1896                 this->block_markbad = onenand_default_block_markbad;
1897         if (!this->scan_bbt)
1898                 this->scan_bbt = onenand_default_bbt;
1899
1900         if (onenand_probe(mtd))
1901                 return -ENXIO;
1902
1903         /* Set Sync. Burst Read after probing */
1904         if (this->mmcontrol) {
1905                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
1906                 this->read_bufferram = onenand_sync_read_bufferram;
1907         }
1908
1909         /* Allocate buffers, if necessary */
1910         if (!this->page_buf) {
1911                 size_t len;
1912                 len = mtd->writesize + mtd->oobsize;
1913                 this->page_buf = kmalloc(len, GFP_KERNEL);
1914                 if (!this->page_buf) {
1915                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
1916                         return -ENOMEM;
1917                 }
1918                 this->options |= ONENAND_PAGEBUF_ALLOC;
1919         }
1920
1921         this->state = FL_READY;
1922         init_waitqueue_head(&this->wq);
1923         spin_lock_init(&this->chip_lock);
1924
1925         switch (mtd->oobsize) {
1926         case 64:
1927                 this->autooob = &onenand_oob_64;
1928                 break;
1929
1930         case 32:
1931                 this->autooob = &onenand_oob_32;
1932                 break;
1933
1934         default:
1935                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
1936                         mtd->oobsize);
1937                 /* To prevent kernel oops */
1938                 this->autooob = &onenand_oob_32;
1939                 break;
1940         }
1941
1942         memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
1943
1944         /* Fill in remaining MTD driver data */
1945         mtd->type = MTD_NANDFLASH;
1946         mtd->flags = MTD_CAP_NANDFLASH;
1947         mtd->ecctype = MTD_ECC_SW;
1948         mtd->erase = onenand_erase;
1949         mtd->point = NULL;
1950         mtd->unpoint = NULL;
1951         mtd->read = onenand_read;
1952         mtd->write = onenand_write;
1953         mtd->read_ecc = onenand_read_ecc;
1954         mtd->write_ecc = onenand_write_ecc;
1955         mtd->read_oob = onenand_read_oob;
1956         mtd->write_oob = onenand_write_oob;
1957 #ifdef CONFIG_MTD_ONENAND_OTP
1958         mtd->get_fact_prot_info = onenand_get_fact_prot_info;
1959         mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;
1960         mtd->get_user_prot_info = onenand_get_user_prot_info;
1961         mtd->read_user_prot_reg = onenand_read_user_prot_reg;
1962         mtd->write_user_prot_reg = onenand_write_user_prot_reg;
1963         mtd->lock_user_prot_reg = onenand_lock_user_prot_reg;
1964 #endif
1965         mtd->readv = NULL;
1966         mtd->readv_ecc = NULL;
1967         mtd->writev = onenand_writev;
1968         mtd->writev_ecc = onenand_writev_ecc;
1969         mtd->sync = onenand_sync;
1970         mtd->lock = NULL;
1971         mtd->unlock = onenand_unlock;
1972         mtd->suspend = onenand_suspend;
1973         mtd->resume = onenand_resume;
1974         mtd->block_isbad = onenand_block_isbad;
1975         mtd->block_markbad = onenand_block_markbad;
1976         mtd->owner = THIS_MODULE;
1977
1978         /* Unlock whole block */
1979         mtd->unlock(mtd, 0x0, this->chipsize);
1980
1981         return this->scan_bbt(mtd);
1982 }
1983
1984 /**
1985  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
1986  * @param mtd           MTD device structure
1987  */
1988 void onenand_release(struct mtd_info *mtd)
1989 {
1990         struct onenand_chip *this = mtd->priv;
1991
1992 #ifdef CONFIG_MTD_PARTITIONS
1993         /* Deregister partitions */
1994         del_mtd_partitions (mtd);
1995 #endif
1996         /* Deregister the device */
1997         del_mtd_device (mtd);
1998
1999         /* Free bad block table memory, if allocated */
2000         if (this->bbm)
2001                 kfree(this->bbm);
2002         /* Buffer allocated by onenand_scan */
2003         if (this->options & ONENAND_PAGEBUF_ALLOC)
2004                 kfree(this->page_buf);
2005 }
2006
2007 EXPORT_SYMBOL_GPL(onenand_scan);
2008 EXPORT_SYMBOL_GPL(onenand_release);
2009
2010 MODULE_LICENSE("GPL");
2011 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
2012 MODULE_DESCRIPTION("Generic OneNAND flash driver code");