drivers/mtd/onenand/onenand_base.c

   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright (C) 2005-2007 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *
   7  *  Credits:
   8  *      Adrian Hunter <ext-adrian.hunter@nokia.com>:
   9  *      auto-placement support, read-while load support, various fixes
  10  *      Copyright (C) Nokia Corporation, 2007
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <common.h>
  18 #include <linux/mtd/compat.h>
  19 #include <linux/mtd/mtd.h>
  20 #include <linux/mtd/onenand.h>
  21
  22 #include <asm/io.h>
  23 #include <asm/errno.h>
  24 #include <malloc.h>
  25
  26 /* It should access 16-bit instead of 8-bit */
  27 static inline void *memcpy_16(void *dst, const void *src, unsigned int len)
  28 {
  29         void *ret = dst;
  30         short *d = dst;
  31         const short *s = src;
  32
  33         len >>= 1;
  34         while (len-- > 0)
  35                 *d++ = *s++;
  36         return ret;
  37 }
  38
  39 /**
  40  * onenand_oob_64 - oob info for large (2KB) page
  41  */
  42 static struct nand_ecclayout onenand_oob_64 = {
  43         .eccbytes       = 20,
  44         .eccpos         = {
  45                 8, 9, 10, 11, 12,
  46                 24, 25, 26, 27, 28,
  47                 40, 41, 42, 43, 44,
  48                 56, 57, 58, 59, 60,
  49                 },
  50         .oobfree        = {
  51                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  52                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  53         }
  54 };
  55
  56 /**
  57  * onenand_oob_32 - oob info for middle (1KB) page
  58  */
  59 static struct nand_ecclayout onenand_oob_32 = {
  60         .eccbytes       = 10,
  61         .eccpos         = {
  62                 8, 9, 10, 11, 12,
  63                 24, 25, 26, 27, 28,
  64                 },
  65         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  66 };
  67
  68 static const unsigned char ffchars[] = {
  69         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  70         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  71         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  72         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  73         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  74         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  75         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  76         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
  77 };
  78
  79 /**
  80  * onenand_readw - [OneNAND Interface] Read OneNAND register
  81  * @param addr          address to read
  82  *
  83  * Read OneNAND register
  84  */
  85 static unsigned short onenand_readw(void __iomem * addr)
  86 {
  87         return readw(addr);
  88 }
  89
  90 /**
  91  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
  92  * @param value         value to write
  93  * @param addr          address to write
  94  *
  95  * Write OneNAND register with value
  96  */
  97 static void onenand_writew(unsigned short value, void __iomem * addr)
  98 {
  99         writew(value, addr);
 100 }
 101
 102 /**
 103  * onenand_block_address - [DEFAULT] Get block address
 104  * @param device        the device id
 105  * @param block         the block
 106  * @return              translated block address if DDP, otherwise same
 107  *
 108  * Setup Start Address 1 Register (F100h)
 109  */
 110 static int onenand_block_address(struct onenand_chip *this, int block)
 111 {
 112         /* Device Flash Core select, NAND Flash Block Address */
 113         if (block & this->density_mask)
 114                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 115
 116         return block;
 117 }
 118
 119 /**
 120  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 121  * @param device        the device id
 122  * @param block         the block
 123  * @return              set DBS value if DDP, otherwise 0
 124  *
 125  * Setup Start Address 2 Register (F101h) for DDP
 126  */
 127 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 128 {
 129         /* Device BufferRAM Select */
 130         if (block & this->density_mask)
 131                 return ONENAND_DDP_CHIP1;
 132
 133         return ONENAND_DDP_CHIP0;
 134 }
 135
 136 /**
 137  * onenand_page_address - [DEFAULT] Get page address
 138  * @param page          the page address
 139  * @param sector        the sector address
 140  * @return              combined page and sector address
 141  *
 142  * Setup Start Address 8 Register (F107h)
 143  */
 144 static int onenand_page_address(int page, int sector)
 145 {
 146         /* Flash Page Address, Flash Sector Address */
 147         int fpa, fsa;
 148
 149         fpa = page & ONENAND_FPA_MASK;
 150         fsa = sector & ONENAND_FSA_MASK;
 151
 152         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 153 }
 154
 155 /**
 156  * onenand_buffer_address - [DEFAULT] Get buffer address
 157  * @param dataram1      DataRAM index
 158  * @param sectors       the sector address
 159  * @param count         the number of sectors
 160  * @return              the start buffer value
 161  *
 162  * Setup Start Buffer Register (F200h)
 163  */
 164 static int onenand_buffer_address(int dataram1, int sectors, int count)
 165 {
 166         int bsa, bsc;
 167
 168         /* BufferRAM Sector Address */
 169         bsa = sectors & ONENAND_BSA_MASK;
 170
 171         if (dataram1)
 172                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 173         else
 174                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 175
 176         /* BufferRAM Sector Count */
 177         bsc = count & ONENAND_BSC_MASK;
 178
 179         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 180 }
 181
 182 /**
 183  * onenand_get_density - [DEFAULT] Get OneNAND density
 184  * @param dev_id        OneNAND device ID
 185  *
 186  * Get OneNAND density from device ID
 187  */
 188 static inline int onenand_get_density(int dev_id)
 189 {
 190         int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 191         return (density & ONENAND_DEVICE_DENSITY_MASK);
 192 }
 193
 194 /**
 195  * onenand_command - [DEFAULT] Send command to OneNAND device
 196  * @param mtd           MTD device structure
 197  * @param cmd           the command to be sent
 198  * @param addr          offset to read from or write to
 199  * @param len           number of bytes to read or write
 200  *
 201  * Send command to OneNAND device. This function is used for middle/large page
 202  * devices (1KB/2KB Bytes per page)
 203  */
 204 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr,
 205                            size_t len)
 206 {
 207         struct onenand_chip *this = mtd->priv;
 208         int value, readcmd = 0;
 209         int block, page;
 210         /* Now we use page size operation */
 211         int sectors = 4, count = 4;
 212
 213         /* Address translation */
 214         switch (cmd) {
 215         case ONENAND_CMD_UNLOCK:
 216         case ONENAND_CMD_LOCK:
 217         case ONENAND_CMD_LOCK_TIGHT:
 218         case ONENAND_CMD_UNLOCK_ALL:
 219                 block = -1;
 220                 page = -1;
 221                 break;
 222
 223         case ONENAND_CMD_ERASE:
 224         case ONENAND_CMD_BUFFERRAM:
 225                 block = (int)(addr >> this->erase_shift);
 226                 page = -1;
 227                 break;
 228
 229         default:
 230                 block = (int)(addr >> this->erase_shift);
 231                 page = (int)(addr >> this->page_shift);
 232                 page &= this->page_mask;
 233                 break;
 234         }
 235
 236         /* NOTE: The setting order of the registers is very important! */
 237         if (cmd == ONENAND_CMD_BUFFERRAM) {
 238                 /* Select DataRAM for DDP */
 239                 value = onenand_bufferram_address(this, block);
 240                 this->write_word(value,
 241                                  this->base + ONENAND_REG_START_ADDRESS2);
 242
 243                 /* Switch to the next data buffer */
 244                 ONENAND_SET_NEXT_BUFFERRAM(this);
 245
 246                 return 0;
 247         }
 248
 249         if (block != -1) {
 250                 /* Write 'DFS, FBA' of Flash */
 251                 value = onenand_block_address(this, block);
 252                 this->write_word(value,
 253                                  this->base + ONENAND_REG_START_ADDRESS1);
 254
 255                 /* Write 'DFS, FBA' of Flash */
 256                 value = onenand_bufferram_address(this, block);
 257                 this->write_word(value,
 258                                  this->base + ONENAND_REG_START_ADDRESS2);
 259         }
 260
 261         if (page != -1) {
 262                 int dataram;
 263
 264                 switch (cmd) {
 265                 case ONENAND_CMD_READ:
 266                 case ONENAND_CMD_READOOB:
 267                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 268                         readcmd = 1;
 269                         break;
 270
 271                 default:
 272                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 273                         break;
 274                 }
 275
 276                 /* Write 'FPA, FSA' of Flash */
 277                 value = onenand_page_address(page, sectors);
 278                 this->write_word(value,
 279                                  this->base + ONENAND_REG_START_ADDRESS8);
 280
 281                 /* Write 'BSA, BSC' of DataRAM */
 282                 value = onenand_buffer_address(dataram, sectors, count);
 283                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 284         }
 285
 286         /* Interrupt clear */
 287         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 288         /* Write command */
 289         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 290
 291         return 0;
 292 }
 293
 294 /**
 295  * onenand_wait - [DEFAULT] wait until the command is done
 296  * @param mtd           MTD device structure
 297  * @param state         state to select the max. timeout value
 298  *
 299  * Wait for command done. This applies to all OneNAND command
 300  * Read can take up to 30us, erase up to 2ms and program up to 350us
 301  * according to general OneNAND specs
 302  */
 303 static int onenand_wait(struct mtd_info *mtd, int state)
 304 {
 305         struct onenand_chip *this = mtd->priv;
 306         unsigned int flags = ONENAND_INT_MASTER;
 307         unsigned int interrupt = 0;
 308         unsigned int ctrl, ecc;
 309
 310         while (1) {
 311                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 312                 if (interrupt & flags)
 313                         break;
 314         }
 315
 316         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 317
 318         if (ctrl & ONENAND_CTRL_ERROR) {
 319                 printk("onenand_wait: controller error = 0x%04x\n", ctrl);
 320                 if (ctrl & ONENAND_CTRL_LOCK)
 321                         printk("onenand_wait: it's locked error = 0x%04x\n",
 322                                 ctrl);
 323
 324                 return -EIO;
 325         }
 326
 327         if (interrupt & ONENAND_INT_READ) {
 328                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 329                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 330                         MTDDEBUG (MTD_DEBUG_LEVEL0,
 331                                   "onenand_wait: ECC error = 0x%04x\n", ecc);
 332                         return -EBADMSG;
 333                 }
 334         }
 335
 336         return 0;
 337 }
 338
 339 /**
 340  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 341  * @param mtd           MTD data structure
 342  * @param area          BufferRAM area
 343  * @return              offset given area
 344  *
 345  * Return BufferRAM offset given area
 346  */
 347 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 348 {
 349         struct onenand_chip *this = mtd->priv;
 350
 351         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 352                 if (area == ONENAND_DATARAM)
 353                         return mtd->writesize;
 354                 if (area == ONENAND_SPARERAM)
 355                         return mtd->oobsize;
 356         }
 357
 358         return 0;
 359 }
 360
 361 /**
 362  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 363  * @param mtd           MTD data structure
 364  * @param area          BufferRAM area
 365  * @param buffer        the databuffer to put/get data
 366  * @param offset        offset to read from or write to
 367  * @param count         number of bytes to read/write
 368  *
 369  * Read the BufferRAM area
 370  */
 371 static int onenand_read_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 372                                   unsigned char *buffer, int offset,
 373                                   size_t count)
 374 {
 375         struct onenand_chip *this = mtd->priv;
 376         void __iomem *bufferram;
 377
 378         bufferram = this->base + area;
 379         bufferram += onenand_bufferram_offset(mtd, area);
 380
 381         memcpy_16(buffer, bufferram + offset, count);
 382
 383         return 0;
 384 }
 385
 386 /**
 387  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 388  * @param mtd           MTD data structure
 389  * @param area          BufferRAM area
 390  * @param buffer        the databuffer to put/get data
 391  * @param offset        offset to read from or write to
 392  * @param count         number of bytes to read/write
 393  *
 394  * Read the BufferRAM area with Sync. Burst Mode
 395  */
 396 static int onenand_sync_read_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 397                                        unsigned char *buffer, int offset,
 398                                        size_t count)
 399 {
 400         struct onenand_chip *this = mtd->priv;
 401         void __iomem *bufferram;
 402
 403         bufferram = this->base + area;
 404         bufferram += onenand_bufferram_offset(mtd, area);
 405
 406         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 407
 408         memcpy_16(buffer, bufferram + offset, count);
 409
 410         this->mmcontrol(mtd, 0);
 411
 412         return 0;
 413 }
 414
 415 /**
 416  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 417  * @param mtd           MTD data structure
 418  * @param area          BufferRAM area
 419  * @param buffer        the databuffer to put/get data
 420  * @param offset        offset to read from or write to
 421  * @param count         number of bytes to read/write
 422  *
 423  * Write the BufferRAM area
 424  */
 425 static int onenand_write_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 426                                    const unsigned char *buffer, int offset,
 427                                    size_t count)
 428 {
 429         struct onenand_chip *this = mtd->priv;
 430         void __iomem *bufferram;
 431
 432         bufferram = this->base + area;
 433         bufferram += onenand_bufferram_offset(mtd, area);
 434
 435         memcpy_16(bufferram + offset, buffer, count);
 436
 437         return 0;
 438 }
 439
 440 /**
 441  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 442  * @param mtd           MTD data structure
 443  * @param addr          address to check
 444  * @return              blockpage address
 445  *
 446  * Get blockpage address at 2x program mode
 447  */
 448 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 449 {
 450         struct onenand_chip *this = mtd->priv;
 451         int blockpage, block, page;
 452
 453         /* Calculate the even block number */
 454         block = (int) (addr >> this->erase_shift) & ~1;
 455         /* Is it the odd plane? */
 456         if (addr & this->writesize)
 457                 block++;
 458         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 459         blockpage = (block << 7) | page;
 460
 461         return blockpage;
 462 }
 463
 464 /**
 465  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 466  * @param mtd           MTD data structure
 467  * @param addr          address to check
 468  * @return              1 if there are valid data, otherwise 0
 469  *
 470  * Check bufferram if there is data we required
 471  */
 472 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 473 {
 474         struct onenand_chip *this = mtd->priv;
 475         int blockpage, found = 0;
 476         unsigned int i;
 477
 478 #ifdef CONFIG_S3C64XX
 479         return 0;
 480 #endif
 481
 482         if (ONENAND_IS_2PLANE(this))
 483                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 484         else
 485                 blockpage = (int) (addr >> this->page_shift);
 486
 487         /* Is there valid data? */
 488         i = ONENAND_CURRENT_BUFFERRAM(this);
 489         if (this->bufferram[i].blockpage == blockpage)
 490                 found = 1;
 491         else {
 492                 /* Check another BufferRAM */
 493                 i = ONENAND_NEXT_BUFFERRAM(this);
 494                 if (this->bufferram[i].blockpage == blockpage) {
 495                         ONENAND_SET_NEXT_BUFFERRAM(this);
 496                         found = 1;
 497                 }
 498         }
 499
 500         if (found && ONENAND_IS_DDP(this)) {
 501                 /* Select DataRAM for DDP */
 502                 int block = (int) (addr >> this->erase_shift);
 503                 int value = onenand_bufferram_address(this, block);
 504                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 505         }
 506
 507         return found;
 508 }
 509
 510 /**
 511  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 512  * @param mtd           MTD data structure
 513  * @param addr          address to update
 514  * @param valid         valid flag
 515  *
 516  * Update BufferRAM information
 517  */
 518 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 519                                     int valid)
 520 {
 521         struct onenand_chip *this = mtd->priv;
 522         int blockpage;
 523         unsigned int i;
 524
 525         if (ONENAND_IS_2PLANE(this))
 526                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 527         else
 528                 blockpage = (int)(addr >> this->page_shift);
 529
 530         /* Invalidate another BufferRAM */
 531         i = ONENAND_NEXT_BUFFERRAM(this);
 532         if (this->bufferram[i].blockpage == blockpage)
 533                 this->bufferram[i].blockpage = -1;
 534
 535         /* Update BufferRAM */
 536         i = ONENAND_CURRENT_BUFFERRAM(this);
 537         if (valid)
 538                 this->bufferram[i].blockpage = blockpage;
 539         else
 540                 this->bufferram[i].blockpage = -1;
 541
 542         return 0;
 543 }
 544
 545 /**
 546  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 547  * @param mtd           MTD data structure
 548  * @param addr          start address to invalidate
 549  * @param len           length to invalidate
 550  *
 551  * Invalidate BufferRAM information
 552  */
 553 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 554                                          unsigned int len)
 555 {
 556         struct onenand_chip *this = mtd->priv;
 557         int i;
 558         loff_t end_addr = addr + len;
 559
 560         /* Invalidate BufferRAM */
 561         for (i = 0; i < MAX_BUFFERRAM; i++) {
 562                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 563
 564                 if (buf_addr >= addr && buf_addr < end_addr)
 565                         this->bufferram[i].blockpage = -1;
 566         }
 567 }
 568
 569 /**
 570  * onenand_get_device - [GENERIC] Get chip for selected access
 571  * @param mtd           MTD device structure
 572  * @param new_state     the state which is requested
 573  *
 574  * Get the device and lock it for exclusive access
 575  */
 576 static void onenand_get_device(struct mtd_info *mtd, int new_state)
 577 {
 578         /* Do nothing */
 579 }
 580
 581 /**
 582  * onenand_release_device - [GENERIC] release chip
 583  * @param mtd           MTD device structure
 584  *
 585  * Deselect, release chip lock and wake up anyone waiting on the device
 586  */
 587 static void onenand_release_device(struct mtd_info *mtd)
 588 {
 589         /* Do nothing */
 590 }
 591
 592 /**
 593  * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
 594  * @param mtd           MTD device structure
 595  * @param buf           destination address
 596  * @param column        oob offset to read from
 597  * @param thislen       oob length to read
 598  */
 599 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf,
 600                                         int column, int thislen)
 601 {
 602         struct onenand_chip *this = mtd->priv;
 603         struct nand_oobfree *free;
 604         int readcol = column;
 605         int readend = column + thislen;
 606         int lastgap = 0;
 607         unsigned int i;
 608         uint8_t *oob_buf = this->oob_buf;
 609
 610         free = this->ecclayout->oobfree;
 611         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 612                 if (readcol >= lastgap)
 613                         readcol += free->offset - lastgap;
 614                 if (readend >= lastgap)
 615                         readend += free->offset - lastgap;
 616                 lastgap = free->offset + free->length;
 617         }
 618         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 619         free = this->ecclayout->oobfree;
 620         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 621                 int free_end = free->offset + free->length;
 622                 if (free->offset < readend && free_end > readcol) {
 623                         int st = max_t(int,free->offset,readcol);
 624                         int ed = min_t(int,free_end,readend);
 625                         int n = ed - st;
 626                         memcpy(buf, oob_buf + st, n);
 627                         buf += n;
 628                 } else if (column == 0)
 629                         break;
 630         }
 631         return 0;
 632 }
 633
 634 /**
 635  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
 636  * @param mtd           MTD device structure
 637  * @param from          offset to read from
 638  * @param ops           oob operation description structure
 639  *
 640  * OneNAND read main and/or out-of-band data
 641  */
 642 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 643                 struct mtd_oob_ops *ops)
 644 {
 645         struct onenand_chip *this = mtd->priv;
 646         struct mtd_ecc_stats stats;
 647         size_t len = ops->len;
 648         size_t ooblen = ops->ooblen;
 649         u_char *buf = ops->datbuf;
 650         u_char *oobbuf = ops->oobbuf;
 651         int read = 0, column, thislen;
 652         int oobread = 0, oobcolumn, thisooblen, oobsize;
 653         int ret = 0, boundary = 0;
 654         int writesize = this->writesize;
 655
 656         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 657
 658         if (ops->mode == MTD_OOB_AUTO)
 659                 oobsize = this->ecclayout->oobavail;
 660         else
 661                 oobsize = mtd->oobsize;
 662
 663         oobcolumn = from & (mtd->oobsize - 1);
 664
 665         /* Do not allow reads past end of device */
 666         if ((from + len) > mtd->size) {
 667                 printk(KERN_ERR "onenand_read_ops_nolock: Attempt read beyond end of device\n");
 668                 ops->retlen = 0;
 669                 ops->oobretlen = 0;
 670                 return -EINVAL;
 671         }
 672
 673         stats = mtd->ecc_stats;
 674
 675         /* Read-while-load method */
 676
 677         /* Do first load to bufferRAM */
 678         if (read < len) {
 679                 if (!onenand_check_bufferram(mtd, from)) {
 680                         this->main_buf = buf;
 681                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 682                         ret = this->wait(mtd, FL_READING);
 683                         onenand_update_bufferram(mtd, from, !ret);
 684                         if (ret == -EBADMSG)
 685                                 ret = 0;
 686                 }
 687         }
 688
 689         thislen = min_t(int, writesize, len - read);
 690         column = from & (writesize - 1);
 691         if (column + thislen > writesize)
 692                 thislen = writesize - column;
 693
 694         while (!ret) {
 695                 /* If there is more to load then start next load */
 696                 from += thislen;
 697                 if (read + thislen < len) {
 698                         this->main_buf = buf + thislen;
 699                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 700                         /*
 701                          * Chip boundary handling in DDP
 702                          * Now we issued chip 1 read and pointed chip 1
 703                          * bufferam so we have to point chip 0 bufferam.
 704                          */
 705                         if (ONENAND_IS_DDP(this) &&
 706                                         unlikely(from == (this->chipsize >> 1))) {
 707                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
 708                                 boundary = 1;
 709                         } else
 710                                 boundary = 0;
 711                         ONENAND_SET_PREV_BUFFERRAM(this);
 712                 }
 713
 714                 /* While load is going, read from last bufferRAM */
 715                 this->read_bufferram(mtd, from - thislen, ONENAND_DATARAM, buf, column, thislen);
 716
 717                 /* Read oob area if needed */
 718                 if (oobbuf) {
 719                         thisooblen = oobsize - oobcolumn;
 720                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
 721
 722                         if (ops->mode == MTD_OOB_AUTO)
 723                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
 724                         else
 725                                 this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
 726                         oobread += thisooblen;
 727                         oobbuf += thisooblen;
 728                         oobcolumn = 0;
 729                 }
 730
 731                 /* See if we are done */
 732                 read += thislen;
 733                 if (read == len)
 734                         break;
 735                 /* Set up for next read from bufferRAM */
 736                 if (unlikely(boundary))
 737                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
 738                 ONENAND_SET_NEXT_BUFFERRAM(this);
 739                 buf += thislen;
 740                 thislen = min_t(int, writesize, len - read);
 741                 column = 0;
 742
 743                 /* Now wait for load */
 744                 ret = this->wait(mtd, FL_READING);
 745                 onenand_update_bufferram(mtd, from, !ret);
 746                 if (ret == -EBADMSG)
 747                         ret = 0;
 748         }
 749
 750         /*
 751          * Return success, if no ECC failures, else -EBADMSG
 752          * fs driver will take care of that, because
 753          * retlen == desired len and result == -EBADMSG
 754          */
 755         ops->retlen = read;
 756         ops->oobretlen = oobread;
 757
 758         if (ret)
 759                 return ret;
 760
 761         if (mtd->ecc_stats.failed - stats.failed)
 762                 return -EBADMSG;
 763
 764         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 765 }
 766
 767 /**
 768  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
 769  * @param mtd           MTD device structure
 770  * @param from          offset to read from
 771  * @param ops           oob operation description structure
 772  *
 773  * OneNAND read out-of-band data from the spare area
 774  */
 775 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 776                 struct mtd_oob_ops *ops)
 777 {
 778         struct onenand_chip *this = mtd->priv;
 779         struct mtd_ecc_stats stats;
 780         int read = 0, thislen, column, oobsize;
 781         size_t len = ops->ooblen;
 782         mtd_oob_mode_t mode = ops->mode;
 783         u_char *buf = ops->oobbuf;
 784         int ret = 0;
 785
 786         from += ops->ooboffs;
 787
 788         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 789
 790         /* Initialize return length value */
 791         ops->oobretlen = 0;
 792
 793         if (mode == MTD_OOB_AUTO)
 794                 oobsize = this->ecclayout->oobavail;
 795         else
 796                 oobsize = mtd->oobsize;
 797
 798         column = from & (mtd->oobsize - 1);
 799
 800         if (unlikely(column >= oobsize)) {
 801                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to start read outside oob\n");
 802                 return -EINVAL;
 803         }
 804
 805         /* Do not allow reads past end of device */
 806         if (unlikely(from >= mtd->size ||
 807                 column + len > ((mtd->size >> this->page_shift) -
 808                                 (from >> this->page_shift)) * oobsize)) {
 809                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to read beyond end of device\n");
 810                 return -EINVAL;
 811         }
 812
 813         stats = mtd->ecc_stats;
 814
 815         while (read < len) {
 816                 thislen = oobsize - column;
 817                 thislen = min_t(int, thislen, len);
 818
 819                 this->spare_buf = buf;
 820                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 821
 822                 onenand_update_bufferram(mtd, from, 0);
 823
 824                 ret = this->wait(mtd, FL_READING);
 825                 if (ret && ret != -EBADMSG) {
 826                         printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
 827                         break;
 828                 }
 829
 830                 if (mode == MTD_OOB_AUTO)
 831                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
 832                 else
 833                         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, buf, column, thislen);
 834
 835                 read += thislen;
 836
 837                 if (read == len)
 838                         break;
 839
 840                 buf += thislen;
 841
 842                 /* Read more? */
 843                 if (read < len) {
 844                         /* Page size */
 845                         from += mtd->writesize;
 846                         column = 0;
 847                 }
 848         }
 849
 850         ops->oobretlen = read;
 851
 852         if (ret)
 853                 return ret;
 854
 855         if (mtd->ecc_stats.failed - stats.failed)
 856                 return -EBADMSG;
 857
 858         return 0;
 859 }
 860
 861 /**
 862  * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
 863  * @param mtd           MTD device structure
 864  * @param from          offset to read from
 865  * @param len           number of bytes to read
 866  * @param retlen        pointer to variable to store the number of read bytes
 867  * @param buf           the databuffer to put data
 868  *
 869  * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
 870 */
 871 int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 872                  size_t * retlen, u_char * buf)
 873 {
 874         struct mtd_oob_ops ops = {
 875                 .len    = len,
 876                 .ooblen = 0,
 877                 .datbuf = buf,
 878                 .oobbuf = NULL,
 879         };
 880         int ret;
 881
 882         onenand_get_device(mtd, FL_READING);
 883         ret = onenand_read_ops_nolock(mtd, from, &ops);
 884         onenand_release_device(mtd);
 885
 886         *retlen = ops.retlen;
 887         return ret;
 888 }
 889
 890 /**
 891  * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
 892  * @param mtd           MTD device structure
 893  * @param from          offset to read from
 894  * @param ops           oob operations description structure
 895  *
 896  * OneNAND main and/or out-of-band
 897  */
 898 int onenand_read_oob(struct mtd_info *mtd, loff_t from,
 899                         struct mtd_oob_ops *ops)
 900 {
 901         int ret;
 902
 903         switch (ops->mode) {
 904         case MTD_OOB_PLACE:
 905         case MTD_OOB_AUTO:
 906                 break;
 907         case MTD_OOB_RAW:
 908                 /* Not implemented yet */
 909         default:
 910                 return -EINVAL;
 911         }
 912
 913         onenand_get_device(mtd, FL_READING);
 914         if (ops->datbuf)
 915                 ret = onenand_read_ops_nolock(mtd, from, ops);
 916         else
 917                 ret = onenand_read_oob_nolock(mtd, from, ops);
 918         onenand_release_device(mtd);
 919
 920         return ret;
 921 }
 922
 923 /**
 924  * onenand_bbt_wait - [DEFAULT] wait until the command is done
 925  * @param mtd           MTD device structure
 926  * @param state         state to select the max. timeout value
 927  *
 928  * Wait for command done.
 929  */
 930 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
 931 {
 932         struct onenand_chip *this = mtd->priv;
 933         unsigned int flags = ONENAND_INT_MASTER;
 934         unsigned int interrupt;
 935         unsigned int ctrl;
 936
 937         while (1) {
 938                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 939                 if (interrupt & flags)
 940                         break;
 941         }
 942
 943         /* To get correct interrupt status in timeout case */
 944         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 945         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 946
 947         if (interrupt & ONENAND_INT_READ) {
 948                 int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 949                 if (ecc & ONENAND_ECC_2BIT_ALL)
 950                         return ONENAND_BBT_READ_ERROR;
 951         } else {
 952                 printk(KERN_ERR "onenand_bbt_wait: read timeout!"
 953                                 "ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
 954                 return ONENAND_BBT_READ_FATAL_ERROR;
 955         }
 956
 957         /* Initial bad block case: 0x2400 or 0x0400 */
 958         if (ctrl & ONENAND_CTRL_ERROR) {
 959                 printk(KERN_DEBUG "onenand_bbt_wait: controller error = 0x%04x\n", ctrl);
 960                 return ONENAND_BBT_READ_ERROR;
 961         }
 962
 963         return 0;
 964 }
 965
 966 /**
 967  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
 968  * @param mtd           MTD device structure
 969  * @param from          offset to read from
 970  * @param ops           oob operation description structure
 971  *
 972  * OneNAND read out-of-band data from the spare area for bbt scan
 973  */
 974 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
 975                 struct mtd_oob_ops *ops)
 976 {
 977         struct onenand_chip *this = mtd->priv;
 978         int read = 0, thislen, column;
 979         int ret = 0;
 980         size_t len = ops->ooblen;
 981         u_char *buf = ops->oobbuf;
 982
 983         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %zi\n", (unsigned int) from, len);
 984
 985         /* Initialize return value */
 986         ops->oobretlen = 0;
 987
 988         /* Do not allow reads past end of device */
 989         if (unlikely((from + len) > mtd->size)) {
 990                 printk(KERN_ERR "onenand_bbt_read_oob: Attempt read beyond end of device\n");
 991                 return ONENAND_BBT_READ_FATAL_ERROR;
 992         }
 993
 994         /* Grab the lock and see if the device is available */
 995         onenand_get_device(mtd, FL_READING);
 996
 997         column = from & (mtd->oobsize - 1);
 998
 999         while (read < len) {
1000
1001                 thislen = mtd->oobsize - column;
1002                 thislen = min_t(int, thislen, len);
1003
1004                 this->spare_buf = buf;
1005                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
1006
1007                 onenand_update_bufferram(mtd, from, 0);
1008
1009                 ret = this->bbt_wait(mtd, FL_READING);
1010                 if (ret)
1011                         break;
1012
1013                 this->read_spareram(mtd, 0, ONENAND_SPARERAM, buf, column, thislen);
1014                 read += thislen;
1015                 if (read == len)
1016                         break;
1017
1018                 buf += thislen;
1019
1020                 /* Read more? */
1021                 if (read < len) {
1022                         /* Update Page size */
1023                         from += this->writesize;
1024                         column = 0;
1025                 }
1026         }
1027
1028         /* Deselect and wake up anyone waiting on the device */
1029         onenand_release_device(mtd);
1030
1031         ops->oobretlen = read;
1032         return ret;
1033 }
1034
1035
1036 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1037 /**
1038  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1039  * @param mtd           MTD device structure
1040  * @param buf           the databuffer to verify
1041  * @param to            offset to read from
1042  */
1043 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1044 {
1045         struct onenand_chip *this = mtd->priv;
1046         u_char *oob_buf = this->oob_buf;
1047         int status, i;
1048
1049         this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
1050         onenand_update_bufferram(mtd, to, 0);
1051         status = this->wait(mtd, FL_READING);
1052         if (status)
1053                 return status;
1054
1055         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1056         for (i = 0; i < mtd->oobsize; i++)
1057                 if (buf[i] != 0xFF && buf[i] != oob_buf[i])
1058                         return -EBADMSG;
1059
1060         return 0;
1061 }
1062
1063 /**
1064  * onenand_verify - [GENERIC] verify the chip contents after a write
1065  * @param mtd          MTD device structure
1066  * @param buf          the databuffer to verify
1067  * @param addr         offset to read from
1068  * @param len          number of bytes to read and compare
1069  */
1070 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1071 {
1072         struct onenand_chip *this = mtd->priv;
1073         void __iomem *dataram;
1074         int ret = 0;
1075         int thislen, column;
1076
1077         while (len != 0) {
1078                 thislen = min_t(int, this->writesize, len);
1079                 column = addr & (this->writesize - 1);
1080                 if (column + thislen > this->writesize)
1081                         thislen = this->writesize - column;
1082
1083                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1084
1085                 onenand_update_bufferram(mtd, addr, 0);
1086
1087                 ret = this->wait(mtd, FL_READING);
1088                 if (ret)
1089                         return ret;
1090
1091                 onenand_update_bufferram(mtd, addr, 1);
1092
1093                 dataram = this->base + ONENAND_DATARAM;
1094                 dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
1095
1096                 if (memcmp(buf, dataram + column, thislen))
1097                         return -EBADMSG;
1098
1099                 len -= thislen;
1100                 buf += thislen;
1101                 addr += thislen;
1102         }
1103
1104         return 0;
1105 }
1106 #else
1107 #define onenand_verify(...)             (0)
1108 #define onenand_verify_oob(...)         (0)
1109 #endif
1110
1111 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1112
1113 /**
1114  * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
1115  * @param mtd           MTD device structure
1116  * @param oob_buf       oob buffer
1117  * @param buf           source address
1118  * @param column        oob offset to write to
1119  * @param thislen       oob length to write
1120  */
1121 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1122                 const u_char *buf, int column, int thislen)
1123 {
1124         struct onenand_chip *this = mtd->priv;
1125         struct nand_oobfree *free;
1126         int writecol = column;
1127         int writeend = column + thislen;
1128         int lastgap = 0;
1129         unsigned int i;
1130
1131         free = this->ecclayout->oobfree;
1132         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1133                 if (writecol >= lastgap)
1134                         writecol += free->offset - lastgap;
1135                 if (writeend >= lastgap)
1136                         writeend += free->offset - lastgap;
1137                 lastgap = free->offset + free->length;
1138         }
1139         free = this->ecclayout->oobfree;
1140         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1141                 int free_end = free->offset + free->length;
1142                 if (free->offset < writeend && free_end > writecol) {
1143                         int st = max_t(int,free->offset,writecol);
1144                         int ed = min_t(int,free_end,writeend);
1145                         int n = ed - st;
1146                         memcpy(oob_buf + st, buf, n);
1147                         buf += n;
1148                 } else if (column == 0)
1149                         break;
1150         }
1151         return 0;
1152 }
1153
1154 /**
1155  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1156  * @param mtd           MTD device structure
1157  * @param to            offset to write to
1158  * @param ops           oob operation description structure
1159  *
1160  * Write main and/or oob with ECC
1161  */
1162 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1163                 struct mtd_oob_ops *ops)
1164 {
1165         struct onenand_chip *this = mtd->priv;
1166         int written = 0, column, thislen, subpage;
1167         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1168         size_t len = ops->len;
1169         size_t ooblen = ops->ooblen;
1170         const u_char *buf = ops->datbuf;
1171         const u_char *oob = ops->oobbuf;
1172         u_char *oobbuf;
1173         int ret = 0;
1174
1175         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ops_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1176
1177         /* Initialize retlen, in case of early exit */
1178         ops->retlen = 0;
1179         ops->oobretlen = 0;
1180
1181         /* Do not allow writes past end of device */
1182         if (unlikely((to + len) > mtd->size)) {
1183                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt write to past end of device\n");
1184                 return -EINVAL;
1185         }
1186
1187         /* Reject writes, which are not page aligned */
1188         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1189                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
1190                 return -EINVAL;
1191         }
1192
1193         if (ops->mode == MTD_OOB_AUTO)
1194                 oobsize = this->ecclayout->oobavail;
1195         else
1196                 oobsize = mtd->oobsize;
1197
1198         oobcolumn = to & (mtd->oobsize - 1);
1199
1200         column = to & (mtd->writesize - 1);
1201
1202         /* Loop until all data write */
1203         while (written < len) {
1204                 u_char *wbuf = (u_char *) buf;
1205
1206                 thislen = min_t(int, mtd->writesize - column, len - written);
1207                 thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1208
1209                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1210
1211                 /* Partial page write */
1212                 subpage = thislen < mtd->writesize;
1213                 if (subpage) {
1214                         memset(this->page_buf, 0xff, mtd->writesize);
1215                         memcpy(this->page_buf + column, buf, thislen);
1216                         wbuf = this->page_buf;
1217                 }
1218
1219                 this->write_bufferram(mtd, to, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1220
1221                 if (oob) {
1222                         oobbuf = this->oob_buf;
1223
1224                         /* We send data to spare ram with oobsize
1225                          *                          * to prevent byte access */
1226                         memset(oobbuf, 0xff, mtd->oobsize);
1227                         if (ops->mode == MTD_OOB_AUTO)
1228                                 onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1229                         else
1230                                 memcpy(oobbuf + oobcolumn, oob, thisooblen);
1231
1232                         oobwritten += thisooblen;
1233                         oob += thisooblen;
1234                         oobcolumn = 0;
1235                 } else
1236                         oobbuf = (u_char *) ffchars;
1237
1238                 this->write_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1239
1240                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1241
1242                 ret = this->wait(mtd, FL_WRITING);
1243
1244                 /* In partial page write we don't update bufferram */
1245                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1246                 if (ONENAND_IS_2PLANE(this)) {
1247                         ONENAND_SET_BUFFERRAM1(this);
1248                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1249                 }
1250
1251                 if (ret) {
1252                         printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
1253                         break;
1254                 }
1255
1256                 /* Only check verify write turn on */
1257                 ret = onenand_verify(mtd, buf, to, thislen);
1258                 if (ret) {
1259                         printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
1260                         break;
1261                 }
1262
1263                 written += thislen;
1264
1265                 if (written == len)
1266                         break;
1267
1268                 column = 0;
1269                 to += thislen;
1270                 buf += thislen;
1271         }
1272
1273         ops->retlen = written;
1274
1275         return ret;
1276 }
1277
1278 /**
1279  * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
1280  * @param mtd           MTD device structure
1281  * @param to            offset to write to
1282  * @param len           number of bytes to write
1283  * @param retlen        pointer to variable to store the number of written bytes
1284  * @param buf           the data to write
1285  * @param mode          operation mode
1286  *
1287  * OneNAND write out-of-band
1288  */
1289 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
1290                 struct mtd_oob_ops *ops)
1291 {
1292         struct onenand_chip *this = mtd->priv;
1293         int column, ret = 0, oobsize;
1294         int written = 0;
1295         u_char *oobbuf;
1296         size_t len = ops->ooblen;
1297         const u_char *buf = ops->oobbuf;
1298         mtd_oob_mode_t mode = ops->mode;
1299
1300         to += ops->ooboffs;
1301
1302         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1303
1304         /* Initialize retlen, in case of early exit */
1305         ops->oobretlen = 0;
1306
1307         if (mode == MTD_OOB_AUTO)
1308                 oobsize = this->ecclayout->oobavail;
1309         else
1310                 oobsize = mtd->oobsize;
1311
1312         column = to & (mtd->oobsize - 1);
1313
1314         if (unlikely(column >= oobsize)) {
1315                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to start write outside oob\n");
1316                 return -EINVAL;
1317         }
1318
1319         /* For compatibility with NAND: Do not allow write past end of page */
1320         if (unlikely(column + len > oobsize)) {
1321                 printk(KERN_ERR "onenand_write_oob_nolock: "
1322                                 "Attempt to write past end of page\n");
1323                 return -EINVAL;
1324         }
1325
1326         /* Do not allow reads past end of device */
1327         if (unlikely(to >= mtd->size ||
1328                                 column + len > ((mtd->size >> this->page_shift) -
1329                                         (to >> this->page_shift)) * oobsize)) {
1330                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to write past end of device\n");
1331                 return -EINVAL;
1332         }
1333
1334         oobbuf = this->oob_buf;
1335
1336         /* Loop until all data write */
1337         while (written < len) {
1338                 int thislen = min_t(int, oobsize, len - written);
1339
1340                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
1341
1342                 /* We send data to spare ram with oobsize
1343                  * to prevent byte access */
1344                 memset(oobbuf, 0xff, mtd->oobsize);
1345                 if (mode == MTD_OOB_AUTO)
1346                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
1347                 else
1348                         memcpy(oobbuf + column, buf, thislen);
1349                 this->write_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1350
1351                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
1352
1353                 onenand_update_bufferram(mtd, to, 0);
1354                 if (ONENAND_IS_2PLANE(this)) {
1355                         ONENAND_SET_BUFFERRAM1(this);
1356                         onenand_update_bufferram(mtd, to + this->writesize, 0);
1357                 }
1358
1359                 ret = this->wait(mtd, FL_WRITING);
1360                 if (ret) {
1361                         printk(KERN_ERR "onenand_write_oob_nolock: write failed %d\n", ret);
1362                         break;
1363                 }
1364
1365                 ret = onenand_verify_oob(mtd, oobbuf, to);
1366                 if (ret) {
1367                         printk(KERN_ERR "onenand_write_oob_nolock: verify failed %d\n", ret);
1368                         break;
1369                 }
1370
1371                 written += thislen;
1372                 if (written == len)
1373                         break;
1374
1375                 to += mtd->writesize;
1376                 buf += thislen;
1377                 column = 0;
1378         }
1379
1380         ops->oobretlen = written;
1381
1382         return ret;
1383 }
1384
1385 /**
1386  * onenand_write - [MTD Interface] compability function for onenand_write_ecc
1387  * @param mtd           MTD device structure
1388  * @param to            offset to write to
1389  * @param len           number of bytes to write
1390  * @param retlen        pointer to variable to store the number of written bytes
1391  * @param buf           the data to write
1392  *
1393  * Write with ECC
1394  */
1395 int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
1396                   size_t * retlen, const u_char * buf)
1397 {
1398         struct mtd_oob_ops ops = {
1399                 .len    = len,
1400                 .ooblen = 0,
1401                 .datbuf = (u_char *) buf,
1402                 .oobbuf = NULL,
1403         };
1404         int ret;
1405
1406         onenand_get_device(mtd, FL_WRITING);
1407         ret = onenand_write_ops_nolock(mtd, to, &ops);
1408         onenand_release_device(mtd);
1409
1410         *retlen = ops.retlen;
1411         return ret;
1412 }
1413
1414 /**
1415  * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
1416  * @param mtd           MTD device structure
1417  * @param to            offset to write to
1418  * @param ops           oob operation description structure
1419  *
1420  * OneNAND write main and/or out-of-band
1421  */
1422 int onenand_write_oob(struct mtd_info *mtd, loff_t to,
1423                         struct mtd_oob_ops *ops)
1424 {
1425         int ret;
1426
1427         switch (ops->mode) {
1428         case MTD_OOB_PLACE:
1429         case MTD_OOB_AUTO:
1430                 break;
1431         case MTD_OOB_RAW:
1432                 /* Not implemented yet */
1433         default:
1434                 return -EINVAL;
1435         }
1436
1437         onenand_get_device(mtd, FL_WRITING);
1438         if (ops->datbuf)
1439                 ret = onenand_write_ops_nolock(mtd, to, ops);
1440         else
1441                 ret = onenand_write_oob_nolock(mtd, to, ops);
1442         onenand_release_device(mtd);
1443
1444         return ret;
1445
1446 }
1447
1448 /**
1449  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
1450  * @param mtd           MTD device structure
1451  * @param ofs           offset from device start
1452  * @param allowbbt      1, if its allowed to access the bbt area
1453  *
1454  * Check, if the block is bad, Either by reading the bad block table or
1455  * calling of the scan function.
1456  */
1457 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
1458 {
1459         struct onenand_chip *this = mtd->priv;
1460         struct bbm_info *bbm = this->bbm;
1461
1462         /* Return info from the table */
1463         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1464 }
1465
1466
1467 /**
1468  * onenand_erase - [MTD Interface] erase block(s)
1469  * @param mtd           MTD device structure
1470  * @param instr         erase instruction
1471  *
1472  * Erase one ore more blocks
1473  */
1474 int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1475 {
1476         struct onenand_chip *this = mtd->priv;
1477         unsigned int block_size;
1478         loff_t addr;
1479         int len;
1480         int ret = 0;
1481
1482         MTDDEBUG (MTD_DEBUG_LEVEL3,
1483                  "onenand_erase: start = 0x%08x, len = %i\n",
1484                  (unsigned int)instr->addr, (unsigned int)instr->len);
1485
1486         block_size = (1 << this->erase_shift);
1487
1488         /* Start address must align on block boundary */
1489         if (unlikely(instr->addr & (block_size - 1))) {
1490                 MTDDEBUG (MTD_DEBUG_LEVEL0,
1491                          "onenand_erase: Unaligned address\n");
1492                 return -EINVAL;
1493         }
1494
1495         /* Length must align on block boundary */
1496         if (unlikely(instr->len & (block_size - 1))) {
1497                 MTDDEBUG (MTD_DEBUG_LEVEL0,
1498                          "onenand_erase: Length not block aligned\n");
1499                 return -EINVAL;
1500         }
1501
1502         /* Do not allow erase past end of device */
1503         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1504                 MTDDEBUG (MTD_DEBUG_LEVEL0,
1505                          "onenand_erase: Erase past end of device\n");
1506                 return -EINVAL;
1507         }
1508
1509         instr->fail_addr = 0xffffffff;
1510
1511         /* Grab the lock and see if the device is available */
1512         onenand_get_device(mtd, FL_ERASING);
1513
1514         /* Loop throught the pages */
1515         len = instr->len;
1516         addr = instr->addr;
1517
1518         instr->state = MTD_ERASING;
1519
1520         while (len) {
1521
1522                 /* Check if we have a bad block, we do not erase bad blocks */
1523                 if (instr->priv == 0 && onenand_block_isbad_nolock(mtd, addr, 0)) {
1524                         printk(KERN_WARNING "onenand_erase: attempt to erase"
1525                                 " a bad block at addr 0x%08x\n",
1526                                 (unsigned int) addr);
1527                         instr->state = MTD_ERASE_FAILED;
1528                         goto erase_exit;
1529                 }
1530
1531                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1532
1533                 onenand_invalidate_bufferram(mtd, addr, block_size);
1534
1535                 ret = this->wait(mtd, FL_ERASING);
1536                 /* Check, if it is write protected */
1537                 if (ret) {
1538                         if (ret == -EPERM)
1539                                 MTDDEBUG (MTD_DEBUG_LEVEL0, "onenand_erase: "
1540                                           "Device is write protected!!!\n");
1541                         else
1542                                 MTDDEBUG (MTD_DEBUG_LEVEL0, "onenand_erase: "
1543                                           "Failed erase, block %d\n",
1544                                           (unsigned)(addr >> this->erase_shift));
1545                         if (ret == -EPERM)
1546                                 printk("onenand_erase: "
1547                                           "Device is write protected!!!\n");
1548                         else
1549                                 printk("onenand_erase: "
1550                                           "Failed erase, block %d\n",
1551                                           (unsigned)(addr >> this->erase_shift));
1552                         instr->state = MTD_ERASE_FAILED;
1553                         instr->fail_addr = addr;
1554
1555                         goto erase_exit;
1556                 }
1557
1558                 len -= block_size;
1559                 addr += block_size;
1560         }
1561
1562         instr->state = MTD_ERASE_DONE;
1563
1564 erase_exit:
1565
1566         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1567         /* Do call back function */
1568         if (!ret)
1569                 mtd_erase_callback(instr);
1570
1571         /* Deselect and wake up anyone waiting on the device */
1572         onenand_release_device(mtd);
1573
1574         return ret;
1575 }
1576
1577 /**
1578  * onenand_sync - [MTD Interface] sync
1579  * @param mtd           MTD device structure
1580  *
1581  * Sync is actually a wait for chip ready function
1582  */
1583 void onenand_sync(struct mtd_info *mtd)
1584 {
1585         MTDDEBUG (MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1586
1587         /* Grab the lock and see if the device is available */
1588         onenand_get_device(mtd, FL_SYNCING);
1589
1590         /* Release it and go back */
1591         onenand_release_device(mtd);
1592 }
1593
1594 /**
1595  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1596  * @param mtd           MTD device structure
1597  * @param ofs           offset relative to mtd start
1598  *
1599  * Check whether the block is bad
1600  */
1601 int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1602 {
1603         int ret;
1604
1605         /* Check for invalid offset */
1606         if (ofs > mtd->size)
1607                 return -EINVAL;
1608
1609         onenand_get_device(mtd, FL_READING);
1610         ret = onenand_block_isbad_nolock(mtd,ofs, 0);
1611         onenand_release_device(mtd);
1612         return ret;
1613 }
1614
1615 /**
1616  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1617  * @param mtd           MTD device structure
1618  * @param ofs           offset from device start
1619  *
1620  * This is the default implementation, which can be overridden by
1621  * a hardware specific driver.
1622  */
1623 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1624 {
1625         struct onenand_chip *this = mtd->priv;
1626         struct bbm_info *bbm = this->bbm;
1627         u_char buf[2] = {0, 0};
1628         struct mtd_oob_ops ops = {
1629                 .mode = MTD_OOB_PLACE,
1630                 .ooblen = 2,
1631                 .oobbuf = buf,
1632                 .ooboffs = 0,
1633         };
1634         int block;
1635
1636         /* Get block number */
1637         block = ((int) ofs) >> bbm->bbt_erase_shift;
1638         if (bbm->bbt)
1639                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1640
1641         /* We write two bytes, so we dont have to mess with 16 bit access */
1642         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1643         return onenand_write_oob_nolock(mtd, ofs, &ops);
1644 }
1645
1646 /**
1647  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1648  * @param mtd           MTD device structure
1649  * @param ofs           offset relative to mtd start
1650  *
1651  * Mark the block as bad
1652  */
1653 int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1654 {
1655         struct onenand_chip *this = mtd->priv;
1656         int ret;
1657
1658         ret = onenand_block_isbad(mtd, ofs);
1659         if (ret) {
1660                 /* If it was bad already, return success and do nothing */
1661                 if (ret > 0)
1662                         return 0;
1663                 return ret;
1664         }
1665
1666         ret = this->block_markbad(mtd, ofs);
1667         return ret;
1668 }
1669
1670 /**
1671  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
1672  * @param mtd           MTD device structure
1673  * @param ofs           offset relative to mtd start
1674  * @param len           number of bytes to lock or unlock
1675  * @param cmd           lock or unlock command
1676  *
1677  * Lock or unlock one or more blocks
1678  */
1679 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
1680 {
1681         struct onenand_chip *this = mtd->priv;
1682         int start, end, block, value, status;
1683         int wp_status_mask;
1684
1685         start = ofs >> this->erase_shift;
1686         end = len >> this->erase_shift;
1687
1688         if (cmd == ONENAND_CMD_LOCK)
1689                 wp_status_mask = ONENAND_WP_LS;
1690         else
1691                 wp_status_mask = ONENAND_WP_US;
1692
1693         /* Continuous lock scheme */
1694         if (this->options & ONENAND_HAS_CONT_LOCK) {
1695                 /* Set start block address */
1696                 this->write_word(start,
1697                                  this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1698                 /* Set end block address */
1699                 this->write_word(end - 1,
1700                                  this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1701                 /* Write unlock command */
1702                 this->command(mtd, cmd, 0, 0);
1703
1704                 /* There's no return value */
1705                 this->wait(mtd, FL_UNLOCKING);
1706
1707                 /* Sanity check */
1708                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1709                        & ONENAND_CTRL_ONGO)
1710                         continue;
1711
1712                 /* Check lock status */
1713                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1714                 if (!(status & ONENAND_WP_US))
1715                         printk(KERN_ERR "wp status = 0x%x\n", status);
1716
1717                 return 0;
1718         }
1719
1720         /* Block lock scheme */
1721         for (block = start; block < start + end; block++) {
1722                 /* Set block address */
1723                 value = onenand_block_address(this, block);
1724                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1725                 /* Select DataRAM for DDP */
1726                 value = onenand_bufferram_address(this, block);
1727                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1728
1729                 /* Set start block address */
1730                 this->write_word(block,
1731                                  this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1732                 /* Write unlock command */
1733                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1734
1735                 /* There's no return value */
1736                 this->wait(mtd, FL_UNLOCKING);
1737
1738                 /* Sanity check */
1739                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1740                        & ONENAND_CTRL_ONGO)
1741                         continue;
1742
1743                 /* Check lock status */
1744                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1745                 if (!(status & ONENAND_WP_US))
1746                         printk(KERN_ERR "block = %d, wp status = 0x%x\n",
1747                                block, status);
1748         }
1749
1750         return 0;
1751 }
1752
1753 #ifdef ONENAND_LINUX
1754 /**
1755  * onenand_lock - [MTD Interface] Lock block(s)
1756  * @param mtd           MTD device structure
1757  * @param ofs           offset relative to mtd start
1758  * @param len           number of bytes to unlock
1759  *
1760  * Lock one or more blocks
1761  */
1762 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
1763 {
1764         int ret;
1765
1766         onenand_get_device(mtd, FL_LOCKING);
1767         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
1768         onenand_release_device(mtd);
1769         return ret;
1770 }
1771
1772 /**
1773  * onenand_unlock - [MTD Interface] Unlock block(s)
1774  * @param mtd           MTD device structure
1775  * @param ofs           offset relative to mtd start
1776  * @param len           number of bytes to unlock
1777  *
1778  * Unlock one or more blocks
1779  */
1780 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1781 {
1782         int ret;
1783
1784         onenand_get_device(mtd, FL_LOCKING);
1785         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
1786         onenand_release_device(mtd);
1787         return ret;
1788 }
1789 #endif
1790
1791 /**
1792  * onenand_check_lock_status - [OneNAND Interface] Check lock status
1793  * @param this          onenand chip data structure
1794  *
1795  * Check lock status
1796  */
1797 static int onenand_check_lock_status(struct onenand_chip *this)
1798 {
1799         unsigned int value, block, status;
1800         unsigned int end;
1801
1802         end = this->chipsize >> this->erase_shift;
1803         for (block = 0; block < end; block++) {
1804                 /* Set block address */
1805                 value = onenand_block_address(this, block);
1806                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1807                 /* Select DataRAM for DDP */
1808                 value = onenand_bufferram_address(this, block);
1809                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1810                 /* Set start block address */
1811                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1812
1813                 /* Check lock status */
1814                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1815                 if (!(status & ONENAND_WP_US)) {
1816                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1817                         return 0;
1818                 }
1819         }
1820
1821         return 1;
1822 }
1823
1824 /**
1825  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
1826  * @param mtd           MTD device structure
1827  *
1828  * Unlock all blocks
1829  */
1830 static void onenand_unlock_all(struct mtd_info *mtd)
1831 {
1832         struct onenand_chip *this = mtd->priv;
1833         loff_t ofs = 0;
1834         size_t len = this->chipsize;
1835
1836         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
1837                 /* Set start block address */
1838                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1839                 /* Write unlock command */
1840                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
1841
1842                 /* There's no return value */
1843                 this->wait(mtd, FL_LOCKING);
1844
1845                 /* Sanity check */
1846                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1847                                 & ONENAND_CTRL_ONGO)
1848                         continue;
1849
1850                 return;
1851
1852                 /* Check lock status */
1853                 if (onenand_check_lock_status(this))
1854                         return;
1855
1856                 /* Workaround for all block unlock in DDP */
1857                 if (ONENAND_IS_DDP(this)) {
1858                         /* All blocks on another chip */
1859                         ofs = this->chipsize >> 1;
1860                         len = this->chipsize >> 1;
1861                 }
1862         }
1863
1864         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
1865 }
1866
1867
1868 /**
1869  * onenand_check_features - Check and set OneNAND features
1870  * @param mtd           MTD data structure
1871  *
1872  * Check and set OneNAND features
1873  * - lock scheme
1874  * - two plane
1875  */
1876 static void onenand_check_features(struct mtd_info *mtd)
1877 {
1878         struct onenand_chip *this = mtd->priv;
1879         unsigned int density, process;
1880
1881         /* Lock scheme depends on density and process */
1882         density = onenand_get_density(this->device_id);
1883         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
1884
1885         /* Lock scheme */
1886         switch (density) {
1887         case ONENAND_DEVICE_DENSITY_4Gb:
1888                 this->options |= ONENAND_HAS_2PLANE;
1889
1890         case ONENAND_DEVICE_DENSITY_2Gb:
1891                 /* 2Gb DDP don't have 2 plane */
1892                 if (!ONENAND_IS_DDP(this))
1893                         this->options |= ONENAND_HAS_2PLANE;
1894                 this->options |= ONENAND_HAS_UNLOCK_ALL;
1895
1896         case ONENAND_DEVICE_DENSITY_1Gb:
1897                 /* A-Die has all block unlock */
1898                 if (process)
1899                         this->options |= ONENAND_HAS_UNLOCK_ALL;
1900                 break;
1901
1902         default:
1903                 /* Some OneNAND has continuous lock scheme */
1904                 if (!process)
1905                         this->options |= ONENAND_HAS_CONT_LOCK;
1906                 break;
1907         }
1908
1909         if (this->options & ONENAND_HAS_CONT_LOCK)
1910                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
1911         if (this->options & ONENAND_HAS_UNLOCK_ALL)
1912                 printk(KERN_DEBUG "Chip support all block unlock\n");
1913         if (this->options & ONENAND_HAS_2PLANE)
1914                 printk(KERN_DEBUG "Chip has 2 plane\n");
1915 }
1916
1917 /**
1918  * onenand_print_device_info - Print device ID
1919  * @param device        device ID
1920  *
1921  * Print device ID
1922  */
1923 char *onenand_print_device_info(int device, int version)
1924 {
1925         int vcc, demuxed, ddp, density;
1926         char *dev_info = malloc(80);
1927         char *p = dev_info;
1928
1929         vcc = device & ONENAND_DEVICE_VCC_MASK;
1930         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
1931         ddp = device & ONENAND_DEVICE_IS_DDP;
1932         density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
1933         p += sprintf(dev_info, "%sOneNAND%s %dMB %sV 16-bit (0x%02x)",
1934                demuxed ? "" : "Muxed ",
1935                ddp ? "(DDP)" : "",
1936                (16 << density), vcc ? "2.65/3.3" : "1.8", device);
1937
1938         sprintf(p, "\nOneNAND version = 0x%04x", version);
1939         printk("%s\n", dev_info);
1940
1941         return dev_info;
1942 }
1943
1944 static const struct onenand_manufacturers onenand_manuf_ids[] = {
1945         {ONENAND_MFR_SAMSUNG, "Samsung"},
1946 };
1947
1948 /**
1949  * onenand_check_maf - Check manufacturer ID
1950  * @param manuf         manufacturer ID
1951  *
1952  * Check manufacturer ID
1953  */
1954 static int onenand_check_maf(int manuf)
1955 {
1956         int size = ARRAY_SIZE(onenand_manuf_ids);
1957         char *name;
1958         int i;
1959
1960         for (i = 0; size; i++)
1961                 if (manuf == onenand_manuf_ids[i].id)
1962                         break;
1963
1964         if (i < size)
1965                 name = onenand_manuf_ids[i].name;
1966         else
1967                 name = "Unknown";
1968
1969 #ifdef ONENAND_DEBUG
1970         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
1971 #endif
1972
1973         return i == size;
1974 }
1975
1976 /**
1977  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
1978  * @param mtd           MTD device structure
1979  *
1980  * OneNAND detection method:
1981  *   Compare the the values from command with ones from register
1982  */
1983 static int onenand_probe(struct mtd_info *mtd)
1984 {
1985         struct onenand_chip *this = mtd->priv;
1986         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
1987         int density;
1988         int syscfg;
1989
1990         /* Save system configuration 1 */
1991         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
1992         /* Clear Sync. Burst Read mode to read BootRAM */
1993         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);
1994
1995         /* Send the command for reading device ID from BootRAM */
1996         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
1997
1998         /* Read manufacturer and device IDs from BootRAM */
1999         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
2000         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
2001
2002         /* Reset OneNAND to read default register values */
2003         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
2004
2005         /* Wait reset */
2006         this->wait(mtd, FL_RESETING);
2007
2008         /* Restore system configuration 1 */
2009         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2010
2011         /* Check manufacturer ID */
2012         if (onenand_check_maf(bram_maf_id))
2013                 return -ENXIO;
2014
2015         /* Read manufacturer and device IDs from Register */
2016         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
2017         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
2018         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
2019
2020         /* Check OneNAND device */
2021         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
2022                 return -ENXIO;
2023
2024         /* FIXME : Current OneNAND MTD doesn't support Flex-OneNAND */
2025         if (dev_id & (1 << 9)) {
2026                 printk("Not yet support Flex-OneNAND\n");
2027                 return -ENXIO;
2028         }
2029
2030         /* Flash device information */
2031         mtd->name = onenand_print_device_info(dev_id, ver_id);
2032         this->device_id = dev_id;
2033         this->version_id = ver_id;
2034
2035         density = onenand_get_density(dev_id);
2036         this->chipsize = (16 << density) << 20;
2037         /* Set density mask. it is used for DDP */
2038         if (ONENAND_IS_DDP(this))
2039                 this->density_mask = (1 << (density + 6));
2040         else
2041                 this->density_mask = 0;
2042
2043         /* OneNAND page size & block size */
2044         /* The data buffer size is equal to page size */
2045         mtd->writesize =
2046             this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
2047         mtd->oobsize = mtd->writesize >> 5;
2048         /* Pagers per block is always 64 in OneNAND */
2049         mtd->erasesize = mtd->writesize << 6;
2050
2051         this->erase_shift = ffs(mtd->erasesize) - 1;
2052         this->page_shift = ffs(mtd->writesize) - 1;
2053         this->ppb_shift = (this->erase_shift - this->page_shift);
2054         this->page_mask = (mtd->erasesize / mtd->writesize) - 1;
2055         /* It's real page size */
2056         this->writesize = mtd->writesize;
2057
2058         /* REVIST: Multichip handling */
2059
2060         mtd->size = this->chipsize;
2061
2062         /* Check OneNAND features */
2063         onenand_check_features(mtd);
2064
2065         mtd->flags = MTD_CAP_NANDFLASH;
2066         mtd->erase = onenand_erase;
2067         mtd->read = onenand_read;
2068         mtd->write = onenand_write;
2069         mtd->read_oob = onenand_read_oob;
2070         mtd->write_oob = onenand_write_oob;
2071         mtd->sync = onenand_sync;
2072         mtd->block_isbad = onenand_block_isbad;
2073         mtd->block_markbad = onenand_block_markbad;
2074
2075         return 0;
2076 }
2077
2078 /**
2079  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
2080  * @param mtd           MTD device structure
2081  * @param maxchips      Number of chips to scan for
2082  *
2083  * This fills out all the not initialized function pointers
2084  * with the defaults.
2085  * The flash ID is read and the mtd/chip structures are
2086  * filled with the appropriate values.
2087  */
2088 int onenand_scan(struct mtd_info *mtd, int maxchips)
2089 {
2090         int i;
2091         struct onenand_chip *this = mtd->priv;
2092
2093         if (!this->read_word)
2094                 this->read_word = onenand_readw;
2095         if (!this->write_word)
2096                 this->write_word = onenand_writew;
2097
2098         if (!this->command)
2099                 this->command = onenand_command;
2100         if (!this->wait)
2101                 this->wait = onenand_wait;
2102         if (!this->bbt_wait)
2103                 this->bbt_wait = onenand_bbt_wait;
2104
2105         if (!this->read_bufferram)
2106                 this->read_bufferram = onenand_read_bufferram;
2107         if (!this->read_spareram)
2108                 this->read_spareram = onenand_read_bufferram;
2109         if (!this->write_bufferram)
2110                 this->write_bufferram = onenand_write_bufferram;
2111
2112         if (!this->block_markbad)
2113                 this->block_markbad = onenand_default_block_markbad;
2114         if (!this->scan_bbt)
2115                 this->scan_bbt = onenand_default_bbt;
2116
2117         if (onenand_probe(mtd))
2118                 return -ENXIO;
2119
2120         /* Set Sync. Burst Read after probing */
2121         if (this->mmcontrol) {
2122                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
2123                 this->read_bufferram = onenand_sync_read_bufferram;
2124         }
2125
2126         /* Allocate buffers, if necessary */
2127         if (!this->page_buf) {
2128                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
2129                 if (!this->page_buf) {
2130                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
2131                         return -ENOMEM;
2132                 }
2133                 this->options |= ONENAND_PAGEBUF_ALLOC;
2134         }
2135         if (!this->oob_buf) {
2136                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
2137                 if (!this->oob_buf) {
2138                         printk(KERN_ERR "onenand_scan: Can't allocate oob_buf\n");
2139                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
2140                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
2141                                 kfree(this->page_buf);
2142                         }
2143                         return -ENOMEM;
2144                 }
2145                 this->options |= ONENAND_OOBBUF_ALLOC;
2146         }
2147
2148         this->state = FL_READY;
2149
2150         /*
2151          * Allow subpage writes up to oobsize.
2152          */
2153         switch (mtd->oobsize) {
2154         case 64:
2155                 this->ecclayout = &onenand_oob_64;
2156                 mtd->subpage_sft = 2;
2157                 break;
2158
2159         case 32:
2160                 this->ecclayout = &onenand_oob_32;
2161                 mtd->subpage_sft = 1;
2162                 break;
2163
2164         default:
2165                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
2166                         mtd->oobsize);
2167                 mtd->subpage_sft = 0;
2168                 /* To prevent kernel oops */
2169                 this->ecclayout = &onenand_oob_32;
2170                 break;
2171         }
2172
2173         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
2174
2175         /*
2176          * The number of bytes available for a client to place data into
2177          * the out of band area
2178          */
2179         this->ecclayout->oobavail = 0;
2180         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
2181             this->ecclayout->oobfree[i].length; i++)
2182                 this->ecclayout->oobavail +=
2183                         this->ecclayout->oobfree[i].length;
2184         mtd->oobavail = this->ecclayout->oobavail;
2185
2186         mtd->ecclayout = this->ecclayout;
2187
2188         /* Unlock whole block */
2189         onenand_unlock_all(mtd);
2190
2191         return this->scan_bbt(mtd);
2192 }
2193
2194 /**
2195  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
2196  * @param mtd           MTD device structure
2197  */
2198 void onenand_release(struct mtd_info *mtd)
2199 {
2200 }