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  *      Rohit Hagargundgi <h.rohit at samsung.com>,
  13  *      Amul Kumar Saha <amul.saha@samsung.com>:
  14  *      Flex-OneNAND support
  15  *      Copyright (C) Samsung Electronics, 2009
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License version 2 as
  19  * published by the Free Software Foundation.
  20  */
  21
  22 #include <common.h>
  23 #include <linux/compat.h>
  24 #include <linux/mtd/mtd.h>
  25 #include <linux/mtd/onenand.h>
  26
  27 #include <asm/io.h>
  28 #include <asm/errno.h>
  29 #include <malloc.h>
  30
  31 /* It should access 16-bit instead of 8-bit */
  32 static void *memcpy_16(void *dst, const void *src, unsigned int len)
  33 {
  34         void *ret = dst;
  35         short *d = dst;
  36         const short *s = src;
  37
  38         len >>= 1;
  39         while (len-- > 0)
  40                 *d++ = *s++;
  41         return ret;
  42 }
  43
  44 /**
  45  *  onenand_oob_128 - oob info for Flex-Onenand with 4KB page
  46  *  For now, we expose only 64 out of 80 ecc bytes
  47  */
  48 static struct nand_ecclayout onenand_oob_128 = {
  49         .eccbytes       = 64,
  50         .eccpos         = {
  51                 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  52                 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  53                 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  54                 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
  55                 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
  56                 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
  57                 102, 103, 104, 105
  58                 },
  59         .oobfree        = {
  60                 {2, 4}, {18, 4}, {34, 4}, {50, 4},
  61                 {66, 4}, {82, 4}, {98, 4}, {114, 4}
  62         }
  63 };
  64
  65 /**
  66  * onenand_oob_64 - oob info for large (2KB) page
  67  */
  68 static struct nand_ecclayout onenand_oob_64 = {
  69         .eccbytes       = 20,
  70         .eccpos         = {
  71                 8, 9, 10, 11, 12,
  72                 24, 25, 26, 27, 28,
  73                 40, 41, 42, 43, 44,
  74                 56, 57, 58, 59, 60,
  75                 },
  76         .oobfree        = {
  77                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  78                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  79         }
  80 };
  81
  82 /**
  83  * onenand_oob_32 - oob info for middle (1KB) page
  84  */
  85 static struct nand_ecclayout onenand_oob_32 = {
  86         .eccbytes       = 10,
  87         .eccpos         = {
  88                 8, 9, 10, 11, 12,
  89                 24, 25, 26, 27, 28,
  90                 },
  91         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  92 };
  93
  94 static const unsigned char ffchars[] = {
  95         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  96         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  97         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  98         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  99         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 100         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
 101         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 102         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
 103         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 104         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 80 */
 105         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 106         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 96 */
 107         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 108         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 112 */
 109         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 110         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128 */
 111 };
 112
 113 /**
 114  * onenand_readw - [OneNAND Interface] Read OneNAND register
 115  * @param addr          address to read
 116  *
 117  * Read OneNAND register
 118  */
 119 static unsigned short onenand_readw(void __iomem * addr)
 120 {
 121         return readw(addr);
 122 }
 123
 124 /**
 125  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
 126  * @param value         value to write
 127  * @param addr          address to write
 128  *
 129  * Write OneNAND register with value
 130  */
 131 static void onenand_writew(unsigned short value, void __iomem * addr)
 132 {
 133         writew(value, addr);
 134 }
 135
 136 /**
 137  * onenand_block_address - [DEFAULT] Get block address
 138  * @param device        the device id
 139  * @param block         the block
 140  * @return              translated block address if DDP, otherwise same
 141  *
 142  * Setup Start Address 1 Register (F100h)
 143  */
 144 static int onenand_block_address(struct onenand_chip *this, int block)
 145 {
 146         /* Device Flash Core select, NAND Flash Block Address */
 147         if (block & this->density_mask)
 148                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 149
 150         return block;
 151 }
 152
 153 /**
 154  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 155  * @param device        the device id
 156  * @param block         the block
 157  * @return              set DBS value if DDP, otherwise 0
 158  *
 159  * Setup Start Address 2 Register (F101h) for DDP
 160  */
 161 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 162 {
 163         /* Device BufferRAM Select */
 164         if (block & this->density_mask)
 165                 return ONENAND_DDP_CHIP1;
 166
 167         return ONENAND_DDP_CHIP0;
 168 }
 169
 170 /**
 171  * onenand_page_address - [DEFAULT] Get page address
 172  * @param page          the page address
 173  * @param sector        the sector address
 174  * @return              combined page and sector address
 175  *
 176  * Setup Start Address 8 Register (F107h)
 177  */
 178 static int onenand_page_address(int page, int sector)
 179 {
 180         /* Flash Page Address, Flash Sector Address */
 181         int fpa, fsa;
 182
 183         fpa = page & ONENAND_FPA_MASK;
 184         fsa = sector & ONENAND_FSA_MASK;
 185
 186         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 187 }
 188
 189 /**
 190  * onenand_buffer_address - [DEFAULT] Get buffer address
 191  * @param dataram1      DataRAM index
 192  * @param sectors       the sector address
 193  * @param count         the number of sectors
 194  * @return              the start buffer value
 195  *
 196  * Setup Start Buffer Register (F200h)
 197  */
 198 static int onenand_buffer_address(int dataram1, int sectors, int count)
 199 {
 200         int bsa, bsc;
 201
 202         /* BufferRAM Sector Address */
 203         bsa = sectors & ONENAND_BSA_MASK;
 204
 205         if (dataram1)
 206                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 207         else
 208                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 209
 210         /* BufferRAM Sector Count */
 211         bsc = count & ONENAND_BSC_MASK;
 212
 213         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 214 }
 215
 216 /**
 217  * flexonenand_block - Return block number for flash address
 218  * @param this          - OneNAND device structure
 219  * @param addr          - Address for which block number is needed
 220  */
 221 static unsigned int flexonenand_block(struct onenand_chip *this, loff_t addr)
 222 {
 223         unsigned int boundary, blk, die = 0;
 224
 225         if (ONENAND_IS_DDP(this) && addr >= this->diesize[0]) {
 226                 die = 1;
 227                 addr -= this->diesize[0];
 228         }
 229
 230         boundary = this->boundary[die];
 231
 232         blk = addr >> (this->erase_shift - 1);
 233         if (blk > boundary)
 234                 blk = (blk + boundary + 1) >> 1;
 235
 236         blk += die ? this->density_mask : 0;
 237         return blk;
 238 }
 239
 240 unsigned int onenand_block(struct onenand_chip *this, loff_t addr)
 241 {
 242         if (!FLEXONENAND(this))
 243                 return addr >> this->erase_shift;
 244         return flexonenand_block(this, addr);
 245 }
 246
 247 /**
 248  * flexonenand_addr - Return address of the block
 249  * @this:               OneNAND device structure
 250  * @block:              Block number on Flex-OneNAND
 251  *
 252  * Return address of the block
 253  */
 254 static loff_t flexonenand_addr(struct onenand_chip *this, int block)
 255 {
 256         loff_t ofs = 0;
 257         int die = 0, boundary;
 258
 259         if (ONENAND_IS_DDP(this) && block >= this->density_mask) {
 260                 block -= this->density_mask;
 261                 die = 1;
 262                 ofs = this->diesize[0];
 263         }
 264
 265         boundary = this->boundary[die];
 266         ofs += (loff_t) block << (this->erase_shift - 1);
 267         if (block > (boundary + 1))
 268                 ofs += (loff_t) (block - boundary - 1)
 269                         << (this->erase_shift - 1);
 270         return ofs;
 271 }
 272
 273 loff_t onenand_addr(struct onenand_chip *this, int block)
 274 {
 275         if (!FLEXONENAND(this))
 276                 return (loff_t) block << this->erase_shift;
 277         return flexonenand_addr(this, block);
 278 }
 279
 280 /**
 281  * flexonenand_region - [Flex-OneNAND] Return erase region of addr
 282  * @param mtd           MTD device structure
 283  * @param addr          address whose erase region needs to be identified
 284  */
 285 int flexonenand_region(struct mtd_info *mtd, loff_t addr)
 286 {
 287         int i;
 288
 289         for (i = 0; i < mtd->numeraseregions; i++)
 290                 if (addr < mtd->eraseregions[i].offset)
 291                         break;
 292         return i - 1;
 293 }
 294
 295 /**
 296  * onenand_get_density - [DEFAULT] Get OneNAND density
 297  * @param dev_id        OneNAND device ID
 298  *
 299  * Get OneNAND density from device ID
 300  */
 301 static inline int onenand_get_density(int dev_id)
 302 {
 303         int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 304         return (density & ONENAND_DEVICE_DENSITY_MASK);
 305 }
 306
 307 /**
 308  * onenand_command - [DEFAULT] Send command to OneNAND device
 309  * @param mtd           MTD device structure
 310  * @param cmd           the command to be sent
 311  * @param addr          offset to read from or write to
 312  * @param len           number of bytes to read or write
 313  *
 314  * Send command to OneNAND device. This function is used for middle/large page
 315  * devices (1KB/2KB Bytes per page)
 316  */
 317 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr,
 318                            size_t len)
 319 {
 320         struct onenand_chip *this = mtd->priv;
 321         int value;
 322         int block, page;
 323
 324         /* Now we use page size operation */
 325         int sectors = 0, count = 0;
 326
 327         /* Address translation */
 328         switch (cmd) {
 329         case ONENAND_CMD_UNLOCK:
 330         case ONENAND_CMD_LOCK:
 331         case ONENAND_CMD_LOCK_TIGHT:
 332         case ONENAND_CMD_UNLOCK_ALL:
 333                 block = -1;
 334                 page = -1;
 335                 break;
 336
 337         case FLEXONENAND_CMD_PI_ACCESS:
 338                 /* addr contains die index */
 339                 block = addr * this->density_mask;
 340                 page = -1;
 341                 break;
 342
 343         case ONENAND_CMD_ERASE:
 344         case ONENAND_CMD_BUFFERRAM:
 345                 block = onenand_block(this, addr);
 346                 page = -1;
 347                 break;
 348
 349         case FLEXONENAND_CMD_READ_PI:
 350                 cmd = ONENAND_CMD_READ;
 351                 block = addr * this->density_mask;
 352                 page = 0;
 353                 break;
 354
 355         default:
 356                 block = onenand_block(this, addr);
 357                 page = (int) (addr
 358                         - onenand_addr(this, block)) >> this->page_shift;
 359                 page &= this->page_mask;
 360                 break;
 361         }
 362
 363         /* NOTE: The setting order of the registers is very important! */
 364         if (cmd == ONENAND_CMD_BUFFERRAM) {
 365                 /* Select DataRAM for DDP */
 366                 value = onenand_bufferram_address(this, block);
 367                 this->write_word(value,
 368                                  this->base + ONENAND_REG_START_ADDRESS2);
 369
 370                 if (ONENAND_IS_4KB_PAGE(this))
 371                         ONENAND_SET_BUFFERRAM0(this);
 372                 else
 373                         /* Switch to the next data buffer */
 374                         ONENAND_SET_NEXT_BUFFERRAM(this);
 375
 376                 return 0;
 377         }
 378
 379         if (block != -1) {
 380                 /* Write 'DFS, FBA' of Flash */
 381                 value = onenand_block_address(this, block);
 382                 this->write_word(value,
 383                                  this->base + ONENAND_REG_START_ADDRESS1);
 384
 385                 /* Select DataRAM for DDP */
 386                 value = onenand_bufferram_address(this, block);
 387                 this->write_word(value,
 388                                  this->base + ONENAND_REG_START_ADDRESS2);
 389         }
 390
 391         if (page != -1) {
 392                 int dataram;
 393
 394                 switch (cmd) {
 395                 case FLEXONENAND_CMD_RECOVER_LSB:
 396                 case ONENAND_CMD_READ:
 397                 case ONENAND_CMD_READOOB:
 398                         if (ONENAND_IS_4KB_PAGE(this))
 399                                 dataram = ONENAND_SET_BUFFERRAM0(this);
 400                         else
 401                                 dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 402
 403                         break;
 404
 405                 default:
 406                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 407                         break;
 408                 }
 409
 410                 /* Write 'FPA, FSA' of Flash */
 411                 value = onenand_page_address(page, sectors);
 412                 this->write_word(value,
 413                                  this->base + ONENAND_REG_START_ADDRESS8);
 414
 415                 /* Write 'BSA, BSC' of DataRAM */
 416                 value = onenand_buffer_address(dataram, sectors, count);
 417                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 418         }
 419
 420         /* Interrupt clear */
 421         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 422         /* Write command */
 423         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 424
 425         return 0;
 426 }
 427
 428 /**
 429  * onenand_read_ecc - return ecc status
 430  * @param this          onenand chip structure
 431  */
 432 static int onenand_read_ecc(struct onenand_chip *this)
 433 {
 434         int ecc, i;
 435
 436         if (!FLEXONENAND(this))
 437                 return this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 438
 439         for (i = 0; i < 4; i++) {
 440                 ecc = this->read_word(this->base
 441                                 + ((ONENAND_REG_ECC_STATUS + i) << 1));
 442                 if (likely(!ecc))
 443                         continue;
 444                 if (ecc & FLEXONENAND_UNCORRECTABLE_ERROR)
 445                         return ONENAND_ECC_2BIT_ALL;
 446         }
 447
 448         return 0;
 449 }
 450
 451 /**
 452  * onenand_wait - [DEFAULT] wait until the command is done
 453  * @param mtd           MTD device structure
 454  * @param state         state to select the max. timeout value
 455  *
 456  * Wait for command done. This applies to all OneNAND command
 457  * Read can take up to 30us, erase up to 2ms and program up to 350us
 458  * according to general OneNAND specs
 459  */
 460 static int onenand_wait(struct mtd_info *mtd, int state)
 461 {
 462         struct onenand_chip *this = mtd->priv;
 463         unsigned int flags = ONENAND_INT_MASTER;
 464         unsigned int interrupt = 0;
 465         unsigned int ctrl;
 466
 467         while (1) {
 468                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 469                 if (interrupt & flags)
 470                         break;
 471         }
 472
 473         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 474
 475         if (interrupt & ONENAND_INT_READ) {
 476                 int ecc = onenand_read_ecc(this);
 477                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 478                         printk("onenand_wait: ECC error = 0x%04x\n", ecc);
 479                         return -EBADMSG;
 480                 }
 481         }
 482
 483         if (ctrl & ONENAND_CTRL_ERROR) {
 484                 printk("onenand_wait: controller error = 0x%04x\n", ctrl);
 485                 if (ctrl & ONENAND_CTRL_LOCK)
 486                         printk("onenand_wait: it's locked error = 0x%04x\n",
 487                                 ctrl);
 488
 489                 return -EIO;
 490         }
 491
 492
 493         return 0;
 494 }
 495
 496 /**
 497  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 498  * @param mtd           MTD data structure
 499  * @param area          BufferRAM area
 500  * @return              offset given area
 501  *
 502  * Return BufferRAM offset given area
 503  */
 504 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 505 {
 506         struct onenand_chip *this = mtd->priv;
 507
 508         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 509                 if (area == ONENAND_DATARAM)
 510                         return mtd->writesize;
 511                 if (area == ONENAND_SPARERAM)
 512                         return mtd->oobsize;
 513         }
 514
 515         return 0;
 516 }
 517
 518 /**
 519  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 520  * @param mtd           MTD data structure
 521  * @param area          BufferRAM area
 522  * @param buffer        the databuffer to put/get data
 523  * @param offset        offset to read from or write to
 524  * @param count         number of bytes to read/write
 525  *
 526  * Read the BufferRAM area
 527  */
 528 static int onenand_read_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 529                                   unsigned char *buffer, int offset,
 530                                   size_t count)
 531 {
 532         struct onenand_chip *this = mtd->priv;
 533         void __iomem *bufferram;
 534
 535         bufferram = this->base + area;
 536         bufferram += onenand_bufferram_offset(mtd, area);
 537
 538         memcpy_16(buffer, bufferram + offset, count);
 539
 540         return 0;
 541 }
 542
 543 /**
 544  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 545  * @param mtd           MTD data structure
 546  * @param area          BufferRAM area
 547  * @param buffer        the databuffer to put/get data
 548  * @param offset        offset to read from or write to
 549  * @param count         number of bytes to read/write
 550  *
 551  * Read the BufferRAM area with Sync. Burst Mode
 552  */
 553 static int onenand_sync_read_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 554                                        unsigned char *buffer, int offset,
 555                                        size_t count)
 556 {
 557         struct onenand_chip *this = mtd->priv;
 558         void __iomem *bufferram;
 559
 560         bufferram = this->base + area;
 561         bufferram += onenand_bufferram_offset(mtd, area);
 562
 563         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 564
 565         memcpy_16(buffer, bufferram + offset, count);
 566
 567         this->mmcontrol(mtd, 0);
 568
 569         return 0;
 570 }
 571
 572 /**
 573  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 574  * @param mtd           MTD data structure
 575  * @param area          BufferRAM area
 576  * @param buffer        the databuffer to put/get data
 577  * @param offset        offset to read from or write to
 578  * @param count         number of bytes to read/write
 579  *
 580  * Write the BufferRAM area
 581  */
 582 static int onenand_write_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 583                                    const unsigned char *buffer, int offset,
 584                                    size_t count)
 585 {
 586         struct onenand_chip *this = mtd->priv;
 587         void __iomem *bufferram;
 588
 589         bufferram = this->base + area;
 590         bufferram += onenand_bufferram_offset(mtd, area);
 591
 592         memcpy_16(bufferram + offset, buffer, count);
 593
 594         return 0;
 595 }
 596
 597 /**
 598  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 599  * @param mtd           MTD data structure
 600  * @param addr          address to check
 601  * @return              blockpage address
 602  *
 603  * Get blockpage address at 2x program mode
 604  */
 605 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 606 {
 607         struct onenand_chip *this = mtd->priv;
 608         int blockpage, block, page;
 609
 610         /* Calculate the even block number */
 611         block = (int) (addr >> this->erase_shift) & ~1;
 612         /* Is it the odd plane? */
 613         if (addr & this->writesize)
 614                 block++;
 615         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 616         blockpage = (block << 7) | page;
 617
 618         return blockpage;
 619 }
 620
 621 /**
 622  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 623  * @param mtd           MTD data structure
 624  * @param addr          address to check
 625  * @return              1 if there are valid data, otherwise 0
 626  *
 627  * Check bufferram if there is data we required
 628  */
 629 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 630 {
 631         struct onenand_chip *this = mtd->priv;
 632         int blockpage, found = 0;
 633         unsigned int i;
 634
 635         if (ONENAND_IS_2PLANE(this))
 636                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 637         else
 638                 blockpage = (int) (addr >> this->page_shift);
 639
 640         /* Is there valid data? */
 641         i = ONENAND_CURRENT_BUFFERRAM(this);
 642         if (this->bufferram[i].blockpage == blockpage)
 643                 found = 1;
 644         else {
 645                 /* Check another BufferRAM */
 646                 i = ONENAND_NEXT_BUFFERRAM(this);
 647                 if (this->bufferram[i].blockpage == blockpage) {
 648                         ONENAND_SET_NEXT_BUFFERRAM(this);
 649                         found = 1;
 650                 }
 651         }
 652
 653         if (found && ONENAND_IS_DDP(this)) {
 654                 /* Select DataRAM for DDP */
 655                 int block = onenand_block(this, addr);
 656                 int value = onenand_bufferram_address(this, block);
 657                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 658         }
 659
 660         return found;
 661 }
 662
 663 /**
 664  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 665  * @param mtd           MTD data structure
 666  * @param addr          address to update
 667  * @param valid         valid flag
 668  *
 669  * Update BufferRAM information
 670  */
 671 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 672                                     int valid)
 673 {
 674         struct onenand_chip *this = mtd->priv;
 675         int blockpage;
 676         unsigned int i;
 677
 678         if (ONENAND_IS_2PLANE(this))
 679                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 680         else
 681                 blockpage = (int)(addr >> this->page_shift);
 682
 683         /* Invalidate another BufferRAM */
 684         i = ONENAND_NEXT_BUFFERRAM(this);
 685         if (this->bufferram[i].blockpage == blockpage)
 686                 this->bufferram[i].blockpage = -1;
 687
 688         /* Update BufferRAM */
 689         i = ONENAND_CURRENT_BUFFERRAM(this);
 690         if (valid)
 691                 this->bufferram[i].blockpage = blockpage;
 692         else
 693                 this->bufferram[i].blockpage = -1;
 694
 695         return 0;
 696 }
 697
 698 /**
 699  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 700  * @param mtd           MTD data structure
 701  * @param addr          start address to invalidate
 702  * @param len           length to invalidate
 703  *
 704  * Invalidate BufferRAM information
 705  */
 706 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 707                                          unsigned int len)
 708 {
 709         struct onenand_chip *this = mtd->priv;
 710         int i;
 711         loff_t end_addr = addr + len;
 712
 713         /* Invalidate BufferRAM */
 714         for (i = 0; i < MAX_BUFFERRAM; i++) {
 715                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 716
 717                 if (buf_addr >= addr && buf_addr < end_addr)
 718                         this->bufferram[i].blockpage = -1;
 719         }
 720 }
 721
 722 /**
 723  * onenand_get_device - [GENERIC] Get chip for selected access
 724  * @param mtd           MTD device structure
 725  * @param new_state     the state which is requested
 726  *
 727  * Get the device and lock it for exclusive access
 728  */
 729 static void onenand_get_device(struct mtd_info *mtd, int new_state)
 730 {
 731         /* Do nothing */
 732 }
 733
 734 /**
 735  * onenand_release_device - [GENERIC] release chip
 736  * @param mtd           MTD device structure
 737  *
 738  * Deselect, release chip lock and wake up anyone waiting on the device
 739  */
 740 static void onenand_release_device(struct mtd_info *mtd)
 741 {
 742         /* Do nothing */
 743 }
 744
 745 /**
 746  * onenand_transfer_auto_oob - [INTERN] oob auto-placement transfer
 747  * @param mtd           MTD device structure
 748  * @param buf           destination address
 749  * @param column        oob offset to read from
 750  * @param thislen       oob length to read
 751  */
 752 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf,
 753                                         int column, int thislen)
 754 {
 755         struct onenand_chip *this = mtd->priv;
 756         struct nand_oobfree *free;
 757         int readcol = column;
 758         int readend = column + thislen;
 759         int lastgap = 0;
 760         unsigned int i;
 761         uint8_t *oob_buf = this->oob_buf;
 762
 763         free = this->ecclayout->oobfree;
 764         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 765                 if (readcol >= lastgap)
 766                         readcol += free->offset - lastgap;
 767                 if (readend >= lastgap)
 768                         readend += free->offset - lastgap;
 769                 lastgap = free->offset + free->length;
 770         }
 771         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 772         free = this->ecclayout->oobfree;
 773         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 774                 int free_end = free->offset + free->length;
 775                 if (free->offset < readend && free_end > readcol) {
 776                         int st = max_t(int,free->offset,readcol);
 777                         int ed = min_t(int,free_end,readend);
 778                         int n = ed - st;
 779                         memcpy(buf, oob_buf + st, n);
 780                         buf += n;
 781                 } else if (column == 0)
 782                         break;
 783         }
 784         return 0;
 785 }
 786
 787 /**
 788  * onenand_recover_lsb - [Flex-OneNAND] Recover LSB page data
 789  * @param mtd           MTD device structure
 790  * @param addr          address to recover
 791  * @param status        return value from onenand_wait
 792  *
 793  * MLC NAND Flash cell has paired pages - LSB page and MSB page. LSB page has
 794  * lower page address and MSB page has higher page address in paired pages.
 795  * If power off occurs during MSB page program, the paired LSB page data can
 796  * become corrupt. LSB page recovery read is a way to read LSB page though page
 797  * data are corrupted. When uncorrectable error occurs as a result of LSB page
 798  * read after power up, issue LSB page recovery read.
 799  */
 800 static int onenand_recover_lsb(struct mtd_info *mtd, loff_t addr, int status)
 801 {
 802         struct onenand_chip *this = mtd->priv;
 803         int i;
 804
 805         /* Recovery is only for Flex-OneNAND */
 806         if (!FLEXONENAND(this))
 807                 return status;
 808
 809         /* check if we failed due to uncorrectable error */
 810         if (!mtd_is_eccerr(status) && status != ONENAND_BBT_READ_ECC_ERROR)
 811                 return status;
 812
 813         /* check if address lies in MLC region */
 814         i = flexonenand_region(mtd, addr);
 815         if (mtd->eraseregions[i].erasesize < (1 << this->erase_shift))
 816                 return status;
 817
 818         printk("onenand_recover_lsb:"
 819                 "Attempting to recover from uncorrectable read\n");
 820
 821         /* Issue the LSB page recovery command */
 822         this->command(mtd, FLEXONENAND_CMD_RECOVER_LSB, addr, this->writesize);
 823         return this->wait(mtd, FL_READING);
 824 }
 825
 826 /**
 827  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
 828  * @param mtd           MTD device structure
 829  * @param from          offset to read from
 830  * @param ops           oob operation description structure
 831  *
 832  * OneNAND read main and/or out-of-band data
 833  */
 834 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 835                 struct mtd_oob_ops *ops)
 836 {
 837         struct onenand_chip *this = mtd->priv;
 838         struct mtd_ecc_stats stats;
 839         size_t len = ops->len;
 840         size_t ooblen = ops->ooblen;
 841         u_char *buf = ops->datbuf;
 842         u_char *oobbuf = ops->oobbuf;
 843         int read = 0, column, thislen;
 844         int oobread = 0, oobcolumn, thisooblen, oobsize;
 845         int ret = 0, boundary = 0;
 846         int writesize = this->writesize;
 847
 848         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 849
 850         if (ops->mode == MTD_OPS_AUTO_OOB)
 851                 oobsize = this->ecclayout->oobavail;
 852         else
 853                 oobsize = mtd->oobsize;
 854
 855         oobcolumn = from & (mtd->oobsize - 1);
 856
 857         /* Do not allow reads past end of device */
 858         if ((from + len) > mtd->size) {
 859                 printk(KERN_ERR "onenand_read_ops_nolock: Attempt read beyond end of device\n");
 860                 ops->retlen = 0;
 861                 ops->oobretlen = 0;
 862                 return -EINVAL;
 863         }
 864
 865         stats = mtd->ecc_stats;
 866
 867         /* Read-while-load method */
 868         /* Note: We can't use this feature in MLC */
 869
 870         /* Do first load to bufferRAM */
 871         if (read < len) {
 872                 if (!onenand_check_bufferram(mtd, from)) {
 873                         this->main_buf = buf;
 874                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 875                         ret = this->wait(mtd, FL_READING);
 876                         if (unlikely(ret))
 877                                 ret = onenand_recover_lsb(mtd, from, ret);
 878                         onenand_update_bufferram(mtd, from, !ret);
 879                         if (ret == -EBADMSG)
 880                                 ret = 0;
 881                 }
 882         }
 883
 884         thislen = min_t(int, writesize, len - read);
 885         column = from & (writesize - 1);
 886         if (column + thislen > writesize)
 887                 thislen = writesize - column;
 888
 889         while (!ret) {
 890                 /* If there is more to load then start next load */
 891                 from += thislen;
 892                 if (!ONENAND_IS_4KB_PAGE(this) && read + thislen < len) {
 893                         this->main_buf = buf + thislen;
 894                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 895                         /*
 896                          * Chip boundary handling in DDP
 897                          * Now we issued chip 1 read and pointed chip 1
 898                          * bufferam so we have to point chip 0 bufferam.
 899                          */
 900                         if (ONENAND_IS_DDP(this) &&
 901                                         unlikely(from == (this->chipsize >> 1))) {
 902                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
 903                                 boundary = 1;
 904                         } else
 905                                 boundary = 0;
 906                         ONENAND_SET_PREV_BUFFERRAM(this);
 907                 }
 908
 909                 /* While load is going, read from last bufferRAM */
 910                 this->read_bufferram(mtd, from - thislen, ONENAND_DATARAM, buf, column, thislen);
 911
 912                 /* Read oob area if needed */
 913                 if (oobbuf) {
 914                         thisooblen = oobsize - oobcolumn;
 915                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
 916
 917                         if (ops->mode == MTD_OPS_AUTO_OOB)
 918                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
 919                         else
 920                                 this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
 921                         oobread += thisooblen;
 922                         oobbuf += thisooblen;
 923                         oobcolumn = 0;
 924                 }
 925
 926                 if (ONENAND_IS_4KB_PAGE(this) && (read + thislen < len)) {
 927                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 928                         ret = this->wait(mtd, FL_READING);
 929                         if (unlikely(ret))
 930                                 ret = onenand_recover_lsb(mtd, from, ret);
 931                         onenand_update_bufferram(mtd, from, !ret);
 932                         if (mtd_is_eccerr(ret))
 933                                 ret = 0;
 934                 }
 935
 936                 /* See if we are done */
 937                 read += thislen;
 938                 if (read == len)
 939                         break;
 940                 /* Set up for next read from bufferRAM */
 941                 if (unlikely(boundary))
 942                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
 943                 if (!ONENAND_IS_4KB_PAGE(this))
 944                         ONENAND_SET_NEXT_BUFFERRAM(this);
 945                 buf += thislen;
 946                 thislen = min_t(int, writesize, len - read);
 947                 column = 0;
 948
 949                 if (!ONENAND_IS_4KB_PAGE(this)) {
 950                         /* Now wait for load */
 951                         ret = this->wait(mtd, FL_READING);
 952                         onenand_update_bufferram(mtd, from, !ret);
 953                         if (mtd_is_eccerr(ret))
 954                                 ret = 0;
 955                 }
 956         }
 957
 958         /*
 959          * Return success, if no ECC failures, else -EBADMSG
 960          * fs driver will take care of that, because
 961          * retlen == desired len and result == -EBADMSG
 962          */
 963         ops->retlen = read;
 964         ops->oobretlen = oobread;
 965
 966         if (ret)
 967                 return ret;
 968
 969         if (mtd->ecc_stats.failed - stats.failed)
 970                 return -EBADMSG;
 971
 972         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 973 }
 974
 975 /**
 976  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
 977  * @param mtd           MTD device structure
 978  * @param from          offset to read from
 979  * @param ops           oob operation description structure
 980  *
 981  * OneNAND read out-of-band data from the spare area
 982  */
 983 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 984                 struct mtd_oob_ops *ops)
 985 {
 986         struct onenand_chip *this = mtd->priv;
 987         struct mtd_ecc_stats stats;
 988         int read = 0, thislen, column, oobsize;
 989         size_t len = ops->ooblen;
 990         unsigned int mode = ops->mode;
 991         u_char *buf = ops->oobbuf;
 992         int ret = 0, readcmd;
 993
 994         from += ops->ooboffs;
 995
 996         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 997
 998         /* Initialize return length value */
 999         ops->oobretlen = 0;
1000
1001         if (mode == MTD_OPS_AUTO_OOB)
1002                 oobsize = this->ecclayout->oobavail;
1003         else
1004                 oobsize = mtd->oobsize;
1005
1006         column = from & (mtd->oobsize - 1);
1007
1008         if (unlikely(column >= oobsize)) {
1009                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to start read outside oob\n");
1010                 return -EINVAL;
1011         }
1012
1013         /* Do not allow reads past end of device */
1014         if (unlikely(from >= mtd->size ||
1015                 column + len > ((mtd->size >> this->page_shift) -
1016                                 (from >> this->page_shift)) * oobsize)) {
1017                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to read beyond end of device\n");
1018                 return -EINVAL;
1019         }
1020
1021         stats = mtd->ecc_stats;
1022
1023         readcmd = ONENAND_IS_4KB_PAGE(this) ?
1024                 ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1025
1026         while (read < len) {
1027                 thislen = oobsize - column;
1028                 thislen = min_t(int, thislen, len);
1029
1030                 this->spare_buf = buf;
1031                 this->command(mtd, readcmd, from, mtd->oobsize);
1032
1033                 onenand_update_bufferram(mtd, from, 0);
1034
1035                 ret = this->wait(mtd, FL_READING);
1036                 if (unlikely(ret))
1037                         ret = onenand_recover_lsb(mtd, from, ret);
1038
1039                 if (ret && ret != -EBADMSG) {
1040                         printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
1041                         break;
1042                 }
1043
1044                 if (mode == MTD_OPS_AUTO_OOB)
1045                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
1046                 else
1047                         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, buf, column, thislen);
1048
1049                 read += thislen;
1050
1051                 if (read == len)
1052                         break;
1053
1054                 buf += thislen;
1055
1056                 /* Read more? */
1057                 if (read < len) {
1058                         /* Page size */
1059                         from += mtd->writesize;
1060                         column = 0;
1061                 }
1062         }
1063
1064         ops->oobretlen = read;
1065
1066         if (ret)
1067                 return ret;
1068
1069         if (mtd->ecc_stats.failed - stats.failed)
1070                 return -EBADMSG;
1071
1072         return 0;
1073 }
1074
1075 /**
1076  * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
1077  * @param mtd           MTD device structure
1078  * @param from          offset to read from
1079  * @param len           number of bytes to read
1080  * @param retlen        pointer to variable to store the number of read bytes
1081  * @param buf           the databuffer to put data
1082  *
1083  * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
1084 */
1085 int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
1086                  size_t * retlen, u_char * buf)
1087 {
1088         struct mtd_oob_ops ops = {
1089                 .len    = len,
1090                 .ooblen = 0,
1091                 .datbuf = buf,
1092                 .oobbuf = NULL,
1093         };
1094         int ret;
1095
1096         onenand_get_device(mtd, FL_READING);
1097         ret = onenand_read_ops_nolock(mtd, from, &ops);
1098         onenand_release_device(mtd);
1099
1100         *retlen = ops.retlen;
1101         return ret;
1102 }
1103
1104 /**
1105  * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
1106  * @param mtd           MTD device structure
1107  * @param from          offset to read from
1108  * @param ops           oob operations description structure
1109  *
1110  * OneNAND main and/or out-of-band
1111  */
1112 int onenand_read_oob(struct mtd_info *mtd, loff_t from,
1113                         struct mtd_oob_ops *ops)
1114 {
1115         int ret;
1116
1117         switch (ops->mode) {
1118         case MTD_OPS_PLACE_OOB:
1119         case MTD_OPS_AUTO_OOB:
1120                 break;
1121         case MTD_OPS_RAW:
1122                 /* Not implemented yet */
1123         default:
1124                 return -EINVAL;
1125         }
1126
1127         onenand_get_device(mtd, FL_READING);
1128         if (ops->datbuf)
1129                 ret = onenand_read_ops_nolock(mtd, from, ops);
1130         else
1131                 ret = onenand_read_oob_nolock(mtd, from, ops);
1132         onenand_release_device(mtd);
1133
1134         return ret;
1135 }
1136
1137 /**
1138  * onenand_bbt_wait - [DEFAULT] wait until the command is done
1139  * @param mtd           MTD device structure
1140  * @param state         state to select the max. timeout value
1141  *
1142  * Wait for command done.
1143  */
1144 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
1145 {
1146         struct onenand_chip *this = mtd->priv;
1147         unsigned int flags = ONENAND_INT_MASTER;
1148         unsigned int interrupt;
1149         unsigned int ctrl;
1150
1151         while (1) {
1152                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1153                 if (interrupt & flags)
1154                         break;
1155         }
1156
1157         /* To get correct interrupt status in timeout case */
1158         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1159         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
1160
1161         if (interrupt & ONENAND_INT_READ) {
1162                 int ecc = onenand_read_ecc(this);
1163                 if (ecc & ONENAND_ECC_2BIT_ALL) {
1164                         printk(KERN_INFO "onenand_bbt_wait: ecc error = 0x%04x"
1165                                 ", controller = 0x%04x\n", ecc, ctrl);
1166                         return ONENAND_BBT_READ_ERROR;
1167                 }
1168         } else {
1169                 printk(KERN_ERR "onenand_bbt_wait: read timeout!"
1170                                 "ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
1171                 return ONENAND_BBT_READ_FATAL_ERROR;
1172         }
1173
1174         /* Initial bad block case: 0x2400 or 0x0400 */
1175         if (ctrl & ONENAND_CTRL_ERROR) {
1176                 printk(KERN_DEBUG "onenand_bbt_wait: controller error = 0x%04x\n", ctrl);
1177                 return ONENAND_BBT_READ_ERROR;
1178         }
1179
1180         return 0;
1181 }
1182
1183 /**
1184  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
1185  * @param mtd           MTD device structure
1186  * @param from          offset to read from
1187  * @param ops           oob operation description structure
1188  *
1189  * OneNAND read out-of-band data from the spare area for bbt scan
1190  */
1191 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
1192                 struct mtd_oob_ops *ops)
1193 {
1194         struct onenand_chip *this = mtd->priv;
1195         int read = 0, thislen, column;
1196         int ret = 0, readcmd;
1197         size_t len = ops->ooblen;
1198         u_char *buf = ops->oobbuf;
1199
1200         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %zi\n", (unsigned int) from, len);
1201
1202         readcmd = ONENAND_IS_4KB_PAGE(this) ?
1203                 ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1204
1205         /* Initialize return value */
1206         ops->oobretlen = 0;
1207
1208         /* Do not allow reads past end of device */
1209         if (unlikely((from + len) > mtd->size)) {
1210                 printk(KERN_ERR "onenand_bbt_read_oob: Attempt read beyond end of device\n");
1211                 return ONENAND_BBT_READ_FATAL_ERROR;
1212         }
1213
1214         /* Grab the lock and see if the device is available */
1215         onenand_get_device(mtd, FL_READING);
1216
1217         column = from & (mtd->oobsize - 1);
1218
1219         while (read < len) {
1220
1221                 thislen = mtd->oobsize - column;
1222                 thislen = min_t(int, thislen, len);
1223
1224                 this->spare_buf = buf;
1225                 this->command(mtd, readcmd, from, mtd->oobsize);
1226
1227                 onenand_update_bufferram(mtd, from, 0);
1228
1229                 ret = this->bbt_wait(mtd, FL_READING);
1230                 if (unlikely(ret))
1231                         ret = onenand_recover_lsb(mtd, from, ret);
1232
1233                 if (ret)
1234                         break;
1235
1236                 this->read_bufferram(mtd, 0, ONENAND_SPARERAM, buf, column, thislen);
1237                 read += thislen;
1238                 if (read == len)
1239                         break;
1240
1241                 buf += thislen;
1242
1243                 /* Read more? */
1244                 if (read < len) {
1245                         /* Update Page size */
1246                         from += this->writesize;
1247                         column = 0;
1248                 }
1249         }
1250
1251         /* Deselect and wake up anyone waiting on the device */
1252         onenand_release_device(mtd);
1253
1254         ops->oobretlen = read;
1255         return ret;
1256 }
1257
1258
1259 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1260 /**
1261  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1262  * @param mtd           MTD device structure
1263  * @param buf           the databuffer to verify
1264  * @param to            offset to read from
1265  */
1266 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1267 {
1268         struct onenand_chip *this = mtd->priv;
1269         u_char *oob_buf = this->oob_buf;
1270         int status, i, readcmd;
1271
1272         readcmd = ONENAND_IS_4KB_PAGE(this) ?
1273                 ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1274
1275         this->command(mtd, readcmd, to, mtd->oobsize);
1276         onenand_update_bufferram(mtd, to, 0);
1277         status = this->wait(mtd, FL_READING);
1278         if (status)
1279                 return status;
1280
1281         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1282         for (i = 0; i < mtd->oobsize; i++)
1283                 if (buf[i] != 0xFF && buf[i] != oob_buf[i])
1284                         return -EBADMSG;
1285
1286         return 0;
1287 }
1288
1289 /**
1290  * onenand_verify - [GENERIC] verify the chip contents after a write
1291  * @param mtd          MTD device structure
1292  * @param buf          the databuffer to verify
1293  * @param addr         offset to read from
1294  * @param len          number of bytes to read and compare
1295  */
1296 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1297 {
1298         struct onenand_chip *this = mtd->priv;
1299         void __iomem *dataram;
1300         int ret = 0;
1301         int thislen, column;
1302
1303         while (len != 0) {
1304                 thislen = min_t(int, this->writesize, len);
1305                 column = addr & (this->writesize - 1);
1306                 if (column + thislen > this->writesize)
1307                         thislen = this->writesize - column;
1308
1309                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1310
1311                 onenand_update_bufferram(mtd, addr, 0);
1312
1313                 ret = this->wait(mtd, FL_READING);
1314                 if (ret)
1315                         return ret;
1316
1317                 onenand_update_bufferram(mtd, addr, 1);
1318
1319                 dataram = this->base + ONENAND_DATARAM;
1320                 dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
1321
1322                 if (memcmp(buf, dataram + column, thislen))
1323                         return -EBADMSG;
1324
1325                 len -= thislen;
1326                 buf += thislen;
1327                 addr += thislen;
1328         }
1329
1330         return 0;
1331 }
1332 #else
1333 #define onenand_verify(...)             (0)
1334 #define onenand_verify_oob(...)         (0)
1335 #endif
1336
1337 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1338
1339 /**
1340  * onenand_fill_auto_oob - [INTERN] oob auto-placement transfer
1341  * @param mtd           MTD device structure
1342  * @param oob_buf       oob buffer
1343  * @param buf           source address
1344  * @param column        oob offset to write to
1345  * @param thislen       oob length to write
1346  */
1347 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1348                 const u_char *buf, int column, int thislen)
1349 {
1350         struct onenand_chip *this = mtd->priv;
1351         struct nand_oobfree *free;
1352         int writecol = column;
1353         int writeend = column + thislen;
1354         int lastgap = 0;
1355         unsigned int i;
1356
1357         free = this->ecclayout->oobfree;
1358         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1359                 if (writecol >= lastgap)
1360                         writecol += free->offset - lastgap;
1361                 if (writeend >= lastgap)
1362                         writeend += free->offset - lastgap;
1363                 lastgap = free->offset + free->length;
1364         }
1365         free = this->ecclayout->oobfree;
1366         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1367                 int free_end = free->offset + free->length;
1368                 if (free->offset < writeend && free_end > writecol) {
1369                         int st = max_t(int,free->offset,writecol);
1370                         int ed = min_t(int,free_end,writeend);
1371                         int n = ed - st;
1372                         memcpy(oob_buf + st, buf, n);
1373                         buf += n;
1374                 } else if (column == 0)
1375                         break;
1376         }
1377         return 0;
1378 }
1379
1380 /**
1381  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1382  * @param mtd           MTD device structure
1383  * @param to            offset to write to
1384  * @param ops           oob operation description structure
1385  *
1386  * Write main and/or oob with ECC
1387  */
1388 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1389                 struct mtd_oob_ops *ops)
1390 {
1391         struct onenand_chip *this = mtd->priv;
1392         int written = 0, column, thislen, subpage;
1393         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1394         size_t len = ops->len;
1395         size_t ooblen = ops->ooblen;
1396         const u_char *buf = ops->datbuf;
1397         const u_char *oob = ops->oobbuf;
1398         u_char *oobbuf;
1399         int ret = 0;
1400
1401         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ops_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1402
1403         /* Initialize retlen, in case of early exit */
1404         ops->retlen = 0;
1405         ops->oobretlen = 0;
1406
1407         /* Reject writes, which are not page aligned */
1408         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1409                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
1410                 return -EINVAL;
1411         }
1412
1413         if (ops->mode == MTD_OPS_AUTO_OOB)
1414                 oobsize = this->ecclayout->oobavail;
1415         else
1416                 oobsize = mtd->oobsize;
1417
1418         oobcolumn = to & (mtd->oobsize - 1);
1419
1420         column = to & (mtd->writesize - 1);
1421
1422         /* Loop until all data write */
1423         while (written < len) {
1424                 u_char *wbuf = (u_char *) buf;
1425
1426                 thislen = min_t(int, mtd->writesize - column, len - written);
1427                 thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1428
1429                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1430
1431                 /* Partial page write */
1432                 subpage = thislen < mtd->writesize;
1433                 if (subpage) {
1434                         memset(this->page_buf, 0xff, mtd->writesize);
1435                         memcpy(this->page_buf + column, buf, thislen);
1436                         wbuf = this->page_buf;
1437                 }
1438
1439                 this->write_bufferram(mtd, to, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1440
1441                 if (oob) {
1442                         oobbuf = this->oob_buf;
1443
1444                         /* We send data to spare ram with oobsize
1445                          *                          * to prevent byte access */
1446                         memset(oobbuf, 0xff, mtd->oobsize);
1447                         if (ops->mode == MTD_OPS_AUTO_OOB)
1448                                 onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1449                         else
1450                                 memcpy(oobbuf + oobcolumn, oob, thisooblen);
1451
1452                         oobwritten += thisooblen;
1453                         oob += thisooblen;
1454                         oobcolumn = 0;
1455                 } else
1456                         oobbuf = (u_char *) ffchars;
1457
1458                 this->write_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1459
1460                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1461
1462                 ret = this->wait(mtd, FL_WRITING);
1463
1464                 /* In partial page write we don't update bufferram */
1465                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1466                 if (ONENAND_IS_2PLANE(this)) {
1467                         ONENAND_SET_BUFFERRAM1(this);
1468                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1469                 }
1470
1471                 if (ret) {
1472                         printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
1473                         break;
1474                 }
1475
1476                 /* Only check verify write turn on */
1477                 ret = onenand_verify(mtd, buf, to, thislen);
1478                 if (ret) {
1479                         printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
1480                         break;
1481                 }
1482
1483                 written += thislen;
1484
1485                 if (written == len)
1486                         break;
1487
1488                 column = 0;
1489                 to += thislen;
1490                 buf += thislen;
1491         }
1492
1493         ops->retlen = written;
1494
1495         return ret;
1496 }
1497
1498 /**
1499  * onenand_write_oob_nolock - [INTERN] OneNAND write out-of-band
1500  * @param mtd           MTD device structure
1501  * @param to            offset to write to
1502  * @param len           number of bytes to write
1503  * @param retlen        pointer to variable to store the number of written bytes
1504  * @param buf           the data to write
1505  * @param mode          operation mode
1506  *
1507  * OneNAND write out-of-band
1508  */
1509 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
1510                 struct mtd_oob_ops *ops)
1511 {
1512         struct onenand_chip *this = mtd->priv;
1513         int column, ret = 0, oobsize;
1514         int written = 0, oobcmd;
1515         u_char *oobbuf;
1516         size_t len = ops->ooblen;
1517         const u_char *buf = ops->oobbuf;
1518         unsigned int mode = ops->mode;
1519
1520         to += ops->ooboffs;
1521
1522         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1523
1524         /* Initialize retlen, in case of early exit */
1525         ops->oobretlen = 0;
1526
1527         if (mode == MTD_OPS_AUTO_OOB)
1528                 oobsize = this->ecclayout->oobavail;
1529         else
1530                 oobsize = mtd->oobsize;
1531
1532         column = to & (mtd->oobsize - 1);
1533
1534         if (unlikely(column >= oobsize)) {
1535                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to start write outside oob\n");
1536                 return -EINVAL;
1537         }
1538
1539         /* For compatibility with NAND: Do not allow write past end of page */
1540         if (unlikely(column + len > oobsize)) {
1541                 printk(KERN_ERR "onenand_write_oob_nolock: "
1542                                 "Attempt to write past end of page\n");
1543                 return -EINVAL;
1544         }
1545
1546         /* Do not allow reads past end of device */
1547         if (unlikely(to >= mtd->size ||
1548                                 column + len > ((mtd->size >> this->page_shift) -
1549                                         (to >> this->page_shift)) * oobsize)) {
1550                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to write past end of device\n");
1551                 return -EINVAL;
1552         }
1553
1554         oobbuf = this->oob_buf;
1555
1556         oobcmd = ONENAND_IS_4KB_PAGE(this) ?
1557                 ONENAND_CMD_PROG : ONENAND_CMD_PROGOOB;
1558
1559         /* Loop until all data write */
1560         while (written < len) {
1561                 int thislen = min_t(int, oobsize, len - written);
1562
1563                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
1564
1565                 /* We send data to spare ram with oobsize
1566                  * to prevent byte access */
1567                 memset(oobbuf, 0xff, mtd->oobsize);
1568                 if (mode == MTD_OPS_AUTO_OOB)
1569                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
1570                 else
1571                         memcpy(oobbuf + column, buf, thislen);
1572                 this->write_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1573
1574                 if (ONENAND_IS_4KB_PAGE(this)) {
1575                         /* Set main area of DataRAM to 0xff*/
1576                         memset(this->page_buf, 0xff, mtd->writesize);
1577                         this->write_bufferram(mtd, 0, ONENAND_DATARAM,
1578                                 this->page_buf, 0, mtd->writesize);
1579                 }
1580
1581                 this->command(mtd, oobcmd, to, mtd->oobsize);
1582
1583                 onenand_update_bufferram(mtd, to, 0);
1584                 if (ONENAND_IS_2PLANE(this)) {
1585                         ONENAND_SET_BUFFERRAM1(this);
1586                         onenand_update_bufferram(mtd, to + this->writesize, 0);
1587                 }
1588
1589                 ret = this->wait(mtd, FL_WRITING);
1590                 if (ret) {
1591                         printk(KERN_ERR "onenand_write_oob_nolock: write failed %d\n", ret);
1592                         break;
1593                 }
1594
1595                 ret = onenand_verify_oob(mtd, oobbuf, to);
1596                 if (ret) {
1597                         printk(KERN_ERR "onenand_write_oob_nolock: verify failed %d\n", ret);
1598                         break;
1599                 }
1600
1601                 written += thislen;
1602                 if (written == len)
1603                         break;
1604
1605                 to += mtd->writesize;
1606                 buf += thislen;
1607                 column = 0;
1608         }
1609
1610         ops->oobretlen = written;
1611
1612         return ret;
1613 }
1614
1615 /**
1616  * onenand_write - [MTD Interface] compability function for onenand_write_ecc
1617  * @param mtd           MTD device structure
1618  * @param to            offset to write to
1619  * @param len           number of bytes to write
1620  * @param retlen        pointer to variable to store the number of written bytes
1621  * @param buf           the data to write
1622  *
1623  * Write with ECC
1624  */
1625 int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
1626                   size_t * retlen, const u_char * buf)
1627 {
1628         struct mtd_oob_ops ops = {
1629                 .len    = len,
1630                 .ooblen = 0,
1631                 .datbuf = (u_char *) buf,
1632                 .oobbuf = NULL,
1633         };
1634         int ret;
1635
1636         onenand_get_device(mtd, FL_WRITING);
1637         ret = onenand_write_ops_nolock(mtd, to, &ops);
1638         onenand_release_device(mtd);
1639
1640         *retlen = ops.retlen;
1641         return ret;
1642 }
1643
1644 /**
1645  * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
1646  * @param mtd           MTD device structure
1647  * @param to            offset to write to
1648  * @param ops           oob operation description structure
1649  *
1650  * OneNAND write main and/or out-of-band
1651  */
1652 int onenand_write_oob(struct mtd_info *mtd, loff_t to,
1653                         struct mtd_oob_ops *ops)
1654 {
1655         int ret;
1656
1657         switch (ops->mode) {
1658         case MTD_OPS_PLACE_OOB:
1659         case MTD_OPS_AUTO_OOB:
1660                 break;
1661         case MTD_OPS_RAW:
1662                 /* Not implemented yet */
1663         default:
1664                 return -EINVAL;
1665         }
1666
1667         onenand_get_device(mtd, FL_WRITING);
1668         if (ops->datbuf)
1669                 ret = onenand_write_ops_nolock(mtd, to, ops);
1670         else
1671                 ret = onenand_write_oob_nolock(mtd, to, ops);
1672         onenand_release_device(mtd);
1673
1674         return ret;
1675
1676 }
1677
1678 /**
1679  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
1680  * @param mtd           MTD device structure
1681  * @param ofs           offset from device start
1682  * @param allowbbt      1, if its allowed to access the bbt area
1683  *
1684  * Check, if the block is bad, Either by reading the bad block table or
1685  * calling of the scan function.
1686  */
1687 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
1688 {
1689         struct onenand_chip *this = mtd->priv;
1690         struct bbm_info *bbm = this->bbm;
1691
1692         /* Return info from the table */
1693         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1694 }
1695
1696
1697 /**
1698  * onenand_erase - [MTD Interface] erase block(s)
1699  * @param mtd           MTD device structure
1700  * @param instr         erase instruction
1701  *
1702  * Erase one ore more blocks
1703  */
1704 int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1705 {
1706         struct onenand_chip *this = mtd->priv;
1707         unsigned int block_size;
1708         loff_t addr = instr->addr;
1709         unsigned int len = instr->len;
1710         int ret = 0, i;
1711         struct mtd_erase_region_info *region = NULL;
1712         unsigned int region_end = 0;
1713
1714         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n",
1715                         (unsigned int) addr, len);
1716
1717         if (FLEXONENAND(this)) {
1718                 /* Find the eraseregion of this address */
1719                 i = flexonenand_region(mtd, addr);
1720                 region = &mtd->eraseregions[i];
1721
1722                 block_size = region->erasesize;
1723                 region_end = region->offset
1724                         + region->erasesize * region->numblocks;
1725
1726                 /* Start address within region must align on block boundary.
1727                  * Erase region's start offset is always block start address.
1728                  */
1729                 if (unlikely((addr - region->offset) & (block_size - 1))) {
1730                         MTDDEBUG(MTD_DEBUG_LEVEL0, "onenand_erase:"
1731                                 " Unaligned address\n");
1732                         return -EINVAL;
1733                 }
1734         } else {
1735                 block_size = 1 << this->erase_shift;
1736
1737                 /* Start address must align on block boundary */
1738                 if (unlikely(addr & (block_size - 1))) {
1739                         MTDDEBUG(MTD_DEBUG_LEVEL0, "onenand_erase:"
1740                                                 "Unaligned address\n");
1741                         return -EINVAL;
1742                 }
1743         }
1744
1745         /* Length must align on block boundary */
1746         if (unlikely(len & (block_size - 1))) {
1747                 MTDDEBUG (MTD_DEBUG_LEVEL0,
1748                          "onenand_erase: Length not block aligned\n");
1749                 return -EINVAL;
1750         }
1751
1752         /* Grab the lock and see if the device is available */
1753         onenand_get_device(mtd, FL_ERASING);
1754
1755         /* Loop throught the pages */
1756         instr->state = MTD_ERASING;
1757
1758         while (len) {
1759
1760                 /* Check if we have a bad block, we do not erase bad blocks */
1761                 if (instr->priv == 0 && onenand_block_isbad_nolock(mtd, addr, 0)) {
1762                         printk(KERN_WARNING "onenand_erase: attempt to erase"
1763                                 " a bad block at addr 0x%08x\n",
1764                                 (unsigned int) addr);
1765                         instr->state = MTD_ERASE_FAILED;
1766                         goto erase_exit;
1767                 }
1768
1769                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1770
1771                 onenand_invalidate_bufferram(mtd, addr, block_size);
1772
1773                 ret = this->wait(mtd, FL_ERASING);
1774                 /* Check, if it is write protected */
1775                 if (ret) {
1776                         if (ret == -EPERM)
1777                                 MTDDEBUG (MTD_DEBUG_LEVEL0, "onenand_erase: "
1778                                           "Device is write protected!!!\n");
1779                         else
1780                                 MTDDEBUG (MTD_DEBUG_LEVEL0, "onenand_erase: "
1781                                           "Failed erase, block %d\n",
1782                                         onenand_block(this, addr));
1783                         instr->state = MTD_ERASE_FAILED;
1784                         instr->fail_addr = addr;
1785
1786                         goto erase_exit;
1787                 }
1788
1789                 len -= block_size;
1790                 addr += block_size;
1791
1792                 if (addr == region_end) {
1793                         if (!len)
1794                                 break;
1795                         region++;
1796
1797                         block_size = region->erasesize;
1798                         region_end = region->offset
1799                                 + region->erasesize * region->numblocks;
1800
1801                         if (len & (block_size - 1)) {
1802                                 /* This has been checked at MTD
1803                                  * partitioning level. */
1804                                 printk("onenand_erase: Unaligned address\n");
1805                                 goto erase_exit;
1806                         }
1807                 }
1808         }
1809
1810         instr->state = MTD_ERASE_DONE;
1811
1812 erase_exit:
1813
1814         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1815         /* Do call back function */
1816         if (!ret)
1817                 mtd_erase_callback(instr);
1818
1819         /* Deselect and wake up anyone waiting on the device */
1820         onenand_release_device(mtd);
1821
1822         return ret;
1823 }
1824
1825 /**
1826  * onenand_sync - [MTD Interface] sync
1827  * @param mtd           MTD device structure
1828  *
1829  * Sync is actually a wait for chip ready function
1830  */
1831 void onenand_sync(struct mtd_info *mtd)
1832 {
1833         MTDDEBUG (MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1834
1835         /* Grab the lock and see if the device is available */
1836         onenand_get_device(mtd, FL_SYNCING);
1837
1838         /* Release it and go back */
1839         onenand_release_device(mtd);
1840 }
1841
1842 /**
1843  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1844  * @param mtd           MTD device structure
1845  * @param ofs           offset relative to mtd start
1846  *
1847  * Check whether the block is bad
1848  */
1849 int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1850 {
1851         int ret;
1852
1853         /* Check for invalid offset */
1854         if (ofs > mtd->size)
1855                 return -EINVAL;
1856
1857         onenand_get_device(mtd, FL_READING);
1858         ret = onenand_block_isbad_nolock(mtd,ofs, 0);
1859         onenand_release_device(mtd);
1860         return ret;
1861 }
1862
1863 /**
1864  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1865  * @param mtd           MTD device structure
1866  * @param ofs           offset from device start
1867  *
1868  * This is the default implementation, which can be overridden by
1869  * a hardware specific driver.
1870  */
1871 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1872 {
1873         struct onenand_chip *this = mtd->priv;
1874         struct bbm_info *bbm = this->bbm;
1875         u_char buf[2] = {0, 0};
1876         struct mtd_oob_ops ops = {
1877                 .mode = MTD_OPS_PLACE_OOB,
1878                 .ooblen = 2,
1879                 .oobbuf = buf,
1880                 .ooboffs = 0,
1881         };
1882         int block;
1883
1884         /* Get block number */
1885         block = onenand_block(this, ofs);
1886         if (bbm->bbt)
1887                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1888
1889         /* We write two bytes, so we dont have to mess with 16 bit access */
1890         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1891         return onenand_write_oob_nolock(mtd, ofs, &ops);
1892 }
1893
1894 /**
1895  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1896  * @param mtd           MTD device structure
1897  * @param ofs           offset relative to mtd start
1898  *
1899  * Mark the block as bad
1900  */
1901 int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1902 {
1903         int ret;
1904
1905         ret = onenand_block_isbad(mtd, ofs);
1906         if (ret) {
1907                 /* If it was bad already, return success and do nothing */
1908                 if (ret > 0)
1909                         return 0;
1910                 return ret;
1911         }
1912
1913         ret = mtd_block_markbad(mtd, ofs);
1914         return ret;
1915 }
1916
1917 /**
1918  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
1919  * @param mtd           MTD device structure
1920  * @param ofs           offset relative to mtd start
1921  * @param len           number of bytes to lock or unlock
1922  * @param cmd           lock or unlock command
1923  *
1924  * Lock or unlock one or more blocks
1925  */
1926 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
1927 {
1928         struct onenand_chip *this = mtd->priv;
1929         int start, end, block, value, status;
1930
1931         start = onenand_block(this, ofs);
1932         end = onenand_block(this, ofs + len);
1933
1934         /* Continuous lock scheme */
1935         if (this->options & ONENAND_HAS_CONT_LOCK) {
1936                 /* Set start block address */
1937                 this->write_word(start,
1938                                  this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1939                 /* Set end block address */
1940                 this->write_word(end - 1,
1941                                  this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1942                 /* Write unlock command */
1943                 this->command(mtd, cmd, 0, 0);
1944
1945                 /* There's no return value */
1946                 this->wait(mtd, FL_UNLOCKING);
1947
1948                 /* Sanity check */
1949                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1950                        & ONENAND_CTRL_ONGO)
1951                         continue;
1952
1953                 /* Check lock status */
1954                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1955                 if (!(status & ONENAND_WP_US))
1956                         printk(KERN_ERR "wp status = 0x%x\n", status);
1957
1958                 return 0;
1959         }
1960
1961         /* Block lock scheme */
1962         for (block = start; block < end; block++) {
1963                 /* Set block address */
1964                 value = onenand_block_address(this, block);
1965                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1966                 /* Select DataRAM for DDP */
1967                 value = onenand_bufferram_address(this, block);
1968                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1969
1970                 /* Set start block address */
1971                 this->write_word(block,
1972                                  this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1973                 /* Write unlock command */
1974                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1975
1976                 /* There's no return value */
1977                 this->wait(mtd, FL_UNLOCKING);
1978
1979                 /* Sanity check */
1980                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1981                        & ONENAND_CTRL_ONGO)
1982                         continue;
1983
1984                 /* Check lock status */
1985                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1986                 if (!(status & ONENAND_WP_US))
1987                         printk(KERN_ERR "block = %d, wp status = 0x%x\n",
1988                                block, status);
1989         }
1990
1991         return 0;
1992 }
1993
1994 #ifdef ONENAND_LINUX
1995 /**
1996  * onenand_lock - [MTD Interface] Lock block(s)
1997  * @param mtd           MTD device structure
1998  * @param ofs           offset relative to mtd start
1999  * @param len           number of bytes to unlock
2000  *
2001  * Lock one or more blocks
2002  */
2003 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
2004 {
2005         int ret;
2006
2007         onenand_get_device(mtd, FL_LOCKING);
2008         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
2009         onenand_release_device(mtd);
2010         return ret;
2011 }
2012
2013 /**
2014  * onenand_unlock - [MTD Interface] Unlock block(s)
2015  * @param mtd           MTD device structure
2016  * @param ofs           offset relative to mtd start
2017  * @param len           number of bytes to unlock
2018  *
2019  * Unlock one or more blocks
2020  */
2021 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
2022 {
2023         int ret;
2024
2025         onenand_get_device(mtd, FL_LOCKING);
2026         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2027         onenand_release_device(mtd);
2028         return ret;
2029 }
2030 #endif
2031
2032 /**
2033  * onenand_check_lock_status - [OneNAND Interface] Check lock status
2034  * @param this          onenand chip data structure
2035  *
2036  * Check lock status
2037  */
2038 static int onenand_check_lock_status(struct onenand_chip *this)
2039 {
2040         unsigned int value, block, status;
2041         unsigned int end;
2042
2043         end = this->chipsize >> this->erase_shift;
2044         for (block = 0; block < end; block++) {
2045                 /* Set block address */
2046                 value = onenand_block_address(this, block);
2047                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2048                 /* Select DataRAM for DDP */
2049                 value = onenand_bufferram_address(this, block);
2050                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2051                 /* Set start block address */
2052                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2053
2054                 /* Check lock status */
2055                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2056                 if (!(status & ONENAND_WP_US)) {
2057                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
2058                         return 0;
2059                 }
2060         }
2061
2062         return 1;
2063 }
2064
2065 /**
2066  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
2067  * @param mtd           MTD device structure
2068  *
2069  * Unlock all blocks
2070  */
2071 static void onenand_unlock_all(struct mtd_info *mtd)
2072 {
2073         struct onenand_chip *this = mtd->priv;
2074         loff_t ofs = 0;
2075         size_t len = mtd->size;
2076
2077         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
2078                 /* Set start block address */
2079                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2080                 /* Write unlock command */
2081                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
2082
2083                 /* There's no return value */
2084                 this->wait(mtd, FL_LOCKING);
2085
2086                 /* Sanity check */
2087                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2088                                 & ONENAND_CTRL_ONGO)
2089                         continue;
2090
2091                 /* Check lock status */
2092                 if (onenand_check_lock_status(this))
2093                         return;
2094
2095                 /* Workaround for all block unlock in DDP */
2096                 if (ONENAND_IS_DDP(this) && !FLEXONENAND(this)) {
2097                         /* All blocks on another chip */
2098                         ofs = this->chipsize >> 1;
2099                         len = this->chipsize >> 1;
2100                 }
2101         }
2102
2103         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2104 }
2105
2106
2107 /**
2108  * onenand_check_features - Check and set OneNAND features
2109  * @param mtd           MTD data structure
2110  *
2111  * Check and set OneNAND features
2112  * - lock scheme
2113  * - two plane
2114  */
2115 static void onenand_check_features(struct mtd_info *mtd)
2116 {
2117         struct onenand_chip *this = mtd->priv;
2118         unsigned int density, process;
2119
2120         /* Lock scheme depends on density and process */
2121         density = onenand_get_density(this->device_id);
2122         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
2123
2124         /* Lock scheme */
2125         switch (density) {
2126         case ONENAND_DEVICE_DENSITY_4Gb:
2127                 if (ONENAND_IS_DDP(this))
2128                         this->options |= ONENAND_HAS_2PLANE;
2129                 else
2130                         this->options |= ONENAND_HAS_4KB_PAGE;
2131
2132         case ONENAND_DEVICE_DENSITY_2Gb:
2133                 /* 2Gb DDP don't have 2 plane */
2134                 if (!ONENAND_IS_DDP(this))
2135                         this->options |= ONENAND_HAS_2PLANE;
2136                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2137
2138         case ONENAND_DEVICE_DENSITY_1Gb:
2139                 /* A-Die has all block unlock */
2140                 if (process)
2141                         this->options |= ONENAND_HAS_UNLOCK_ALL;
2142                 break;
2143
2144         default:
2145                 /* Some OneNAND has continuous lock scheme */
2146                 if (!process)
2147                         this->options |= ONENAND_HAS_CONT_LOCK;
2148                 break;
2149         }
2150
2151         if (ONENAND_IS_MLC(this))
2152                 this->options |= ONENAND_HAS_4KB_PAGE;
2153
2154         if (ONENAND_IS_4KB_PAGE(this))
2155                 this->options &= ~ONENAND_HAS_2PLANE;
2156
2157         if (FLEXONENAND(this)) {
2158                 this->options &= ~ONENAND_HAS_CONT_LOCK;
2159                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2160         }
2161
2162         if (this->options & ONENAND_HAS_CONT_LOCK)
2163                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
2164         if (this->options & ONENAND_HAS_UNLOCK_ALL)
2165                 printk(KERN_DEBUG "Chip support all block unlock\n");
2166         if (this->options & ONENAND_HAS_2PLANE)
2167                 printk(KERN_DEBUG "Chip has 2 plane\n");
2168         if (this->options & ONENAND_HAS_4KB_PAGE)
2169                 printk(KERN_DEBUG "Chip has 4KiB pagesize\n");
2170
2171 }
2172
2173 /**
2174  * onenand_print_device_info - Print device ID
2175  * @param device        device ID
2176  *
2177  * Print device ID
2178  */
2179 char *onenand_print_device_info(int device, int version)
2180 {
2181         int vcc, demuxed, ddp, density, flexonenand;
2182         char *dev_info = malloc(80);
2183         char *p = dev_info;
2184
2185         vcc = device & ONENAND_DEVICE_VCC_MASK;
2186         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
2187         ddp = device & ONENAND_DEVICE_IS_DDP;
2188         density = onenand_get_density(device);
2189         flexonenand = device & DEVICE_IS_FLEXONENAND;
2190         p += sprintf(dev_info, "%s%sOneNAND%s %dMB %sV 16-bit (0x%02x)",
2191                demuxed ? "" : "Muxed ",
2192                flexonenand ? "Flex-" : "",
2193                ddp ? "(DDP)" : "",
2194                (16 << density), vcc ? "2.65/3.3" : "1.8", device);
2195
2196         sprintf(p, "\nOneNAND version = 0x%04x", version);
2197         printk("%s\n", dev_info);
2198
2199         return dev_info;
2200 }
2201
2202 static const struct onenand_manufacturers onenand_manuf_ids[] = {
2203         {ONENAND_MFR_NUMONYX, "Numonyx"},
2204         {ONENAND_MFR_SAMSUNG, "Samsung"},
2205 };
2206
2207 /**
2208  * onenand_check_maf - Check manufacturer ID
2209  * @param manuf         manufacturer ID
2210  *
2211  * Check manufacturer ID
2212  */
2213 static int onenand_check_maf(int manuf)
2214 {
2215         int size = ARRAY_SIZE(onenand_manuf_ids);
2216         int i;
2217 #ifdef ONENAND_DEBUG
2218         char *name;
2219 #endif
2220
2221         for (i = 0; i < size; i++)
2222                 if (manuf == onenand_manuf_ids[i].id)
2223                         break;
2224
2225 #ifdef ONENAND_DEBUG
2226         if (i < size)
2227                 name = onenand_manuf_ids[i].name;
2228         else
2229                 name = "Unknown";
2230
2231         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
2232 #endif
2233
2234         return i == size;
2235 }
2236
2237 /**
2238 * flexonenand_get_boundary      - Reads the SLC boundary
2239 * @param onenand_info           - onenand info structure
2240 *
2241 * Fill up boundary[] field in onenand_chip
2242 **/
2243 static int flexonenand_get_boundary(struct mtd_info *mtd)
2244 {
2245         struct onenand_chip *this = mtd->priv;
2246         unsigned int die, bdry;
2247         int syscfg, locked;
2248
2249         /* Disable ECC */
2250         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2251         this->write_word((syscfg | 0x0100), this->base + ONENAND_REG_SYS_CFG1);
2252
2253         for (die = 0; die < this->dies; die++) {
2254                 this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
2255                 this->wait(mtd, FL_SYNCING);
2256
2257                 this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
2258                 this->wait(mtd, FL_READING);
2259
2260                 bdry = this->read_word(this->base + ONENAND_DATARAM);
2261                 if ((bdry >> FLEXONENAND_PI_UNLOCK_SHIFT) == 3)
2262                         locked = 0;
2263                 else
2264                         locked = 1;
2265                 this->boundary[die] = bdry & FLEXONENAND_PI_MASK;
2266
2267                 this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2268                 this->wait(mtd, FL_RESETING);
2269
2270                 printk(KERN_INFO "Die %d boundary: %d%s\n", die,
2271                        this->boundary[die], locked ? "(Locked)" : "(Unlocked)");
2272         }
2273
2274         /* Enable ECC */
2275         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2276         return 0;
2277 }
2278
2279 /**
2280  * flexonenand_get_size - Fill up fields in onenand_chip and mtd_info
2281  *                        boundary[], diesize[], mtd->size, mtd->erasesize,
2282  *                        mtd->eraseregions
2283  * @param mtd           - MTD device structure
2284  */
2285 static void flexonenand_get_size(struct mtd_info *mtd)
2286 {
2287         struct onenand_chip *this = mtd->priv;
2288         int die, i, eraseshift, density;
2289         int blksperdie, maxbdry;
2290         loff_t ofs;
2291
2292         density = onenand_get_density(this->device_id);
2293         blksperdie = ((loff_t)(16 << density) << 20) >> (this->erase_shift);
2294         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
2295         maxbdry = blksperdie - 1;
2296         eraseshift = this->erase_shift - 1;
2297
2298         mtd->numeraseregions = this->dies << 1;
2299
2300         /* This fills up the device boundary */
2301         flexonenand_get_boundary(mtd);
2302         die = 0;
2303         ofs = 0;
2304         i = -1;
2305         for (; die < this->dies; die++) {
2306                 if (!die || this->boundary[die-1] != maxbdry) {
2307                         i++;
2308                         mtd->eraseregions[i].offset = ofs;
2309                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
2310                         mtd->eraseregions[i].numblocks =
2311                                                         this->boundary[die] + 1;
2312                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
2313                         eraseshift++;
2314                 } else {
2315                         mtd->numeraseregions -= 1;
2316                         mtd->eraseregions[i].numblocks +=
2317                                                         this->boundary[die] + 1;
2318                         ofs += (this->boundary[die] + 1) << (eraseshift - 1);
2319                 }
2320                 if (this->boundary[die] != maxbdry) {
2321                         i++;
2322                         mtd->eraseregions[i].offset = ofs;
2323                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
2324                         mtd->eraseregions[i].numblocks = maxbdry ^
2325                                                          this->boundary[die];
2326                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
2327                         eraseshift--;
2328                 } else
2329                         mtd->numeraseregions -= 1;
2330         }
2331
2332         /* Expose MLC erase size except when all blocks are SLC */
2333         mtd->erasesize = 1 << this->erase_shift;
2334         if (mtd->numeraseregions == 1)
2335                 mtd->erasesize >>= 1;
2336
2337         printk(KERN_INFO "Device has %d eraseregions\n", mtd->numeraseregions);
2338         for (i = 0; i < mtd->numeraseregions; i++)
2339                 printk(KERN_INFO "[offset: 0x%08llx, erasesize: 0x%05x,"
2340                         " numblocks: %04u]\n", mtd->eraseregions[i].offset,
2341                         mtd->eraseregions[i].erasesize,
2342                         mtd->eraseregions[i].numblocks);
2343
2344         for (die = 0, mtd->size = 0; die < this->dies; die++) {
2345                 this->diesize[die] = (loff_t) (blksperdie << this->erase_shift);
2346                 this->diesize[die] -= (loff_t) (this->boundary[die] + 1)
2347                                                  << (this->erase_shift - 1);
2348                 mtd->size += this->diesize[die];
2349         }
2350 }
2351
2352 /**
2353  * flexonenand_check_blocks_erased - Check if blocks are erased
2354  * @param mtd_info      - mtd info structure
2355  * @param start         - first erase block to check
2356  * @param end           - last erase block to check
2357  *
2358  * Converting an unerased block from MLC to SLC
2359  * causes byte values to change. Since both data and its ECC
2360  * have changed, reads on the block give uncorrectable error.
2361  * This might lead to the block being detected as bad.
2362  *
2363  * Avoid this by ensuring that the block to be converted is
2364  * erased.
2365  */
2366 static int flexonenand_check_blocks_erased(struct mtd_info *mtd,
2367                                         int start, int end)
2368 {
2369         struct onenand_chip *this = mtd->priv;
2370         int i, ret;
2371         int block;
2372         struct mtd_oob_ops ops = {
2373                 .mode = MTD_OPS_PLACE_OOB,
2374                 .ooboffs = 0,
2375                 .ooblen = mtd->oobsize,
2376                 .datbuf = NULL,
2377                 .oobbuf = this->oob_buf,
2378         };
2379         loff_t addr;
2380
2381         printk(KERN_DEBUG "Check blocks from %d to %d\n", start, end);
2382
2383         for (block = start; block <= end; block++) {
2384                 addr = flexonenand_addr(this, block);
2385                 if (onenand_block_isbad_nolock(mtd, addr, 0))
2386                         continue;
2387
2388                 /*
2389                  * Since main area write results in ECC write to spare,
2390                  * it is sufficient to check only ECC bytes for change.
2391                  */
2392                 ret = onenand_read_oob_nolock(mtd, addr, &ops);
2393                 if (ret)
2394                         return ret;
2395
2396                 for (i = 0; i < mtd->oobsize; i++)
2397                         if (this->oob_buf[i] != 0xff)
2398                                 break;
2399
2400                 if (i != mtd->oobsize) {
2401                         printk(KERN_WARNING "Block %d not erased.\n", block);
2402                         return 1;
2403                 }
2404         }
2405
2406         return 0;
2407 }
2408
2409 /**
2410  * flexonenand_set_boundary     - Writes the SLC boundary
2411  * @param mtd                   - mtd info structure
2412  */
2413 int flexonenand_set_boundary(struct mtd_info *mtd, int die,
2414                                     int boundary, int lock)
2415 {
2416         struct onenand_chip *this = mtd->priv;
2417         int ret, density, blksperdie, old, new, thisboundary;
2418         loff_t addr;
2419
2420         if (die >= this->dies)
2421                 return -EINVAL;
2422
2423         if (boundary == this->boundary[die])
2424                 return 0;
2425
2426         density = onenand_get_density(this->device_id);
2427         blksperdie = ((16 << density) << 20) >> this->erase_shift;
2428         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
2429
2430         if (boundary >= blksperdie) {
2431                 printk("flexonenand_set_boundary:"
2432                         "Invalid boundary value. "
2433                         "Boundary not changed.\n");
2434                 return -EINVAL;
2435         }
2436
2437         /* Check if converting blocks are erased */
2438         old = this->boundary[die] + (die * this->density_mask);
2439         new = boundary + (die * this->density_mask);
2440         ret = flexonenand_check_blocks_erased(mtd, min(old, new)
2441                                                 + 1, max(old, new));
2442         if (ret) {
2443                 printk(KERN_ERR "flexonenand_set_boundary: Please erase blocks before boundary change\n");
2444                 return ret;
2445         }
2446
2447         this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
2448         this->wait(mtd, FL_SYNCING);
2449
2450         /* Check is boundary is locked */
2451         this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
2452         ret = this->wait(mtd, FL_READING);
2453
2454         thisboundary = this->read_word(this->base + ONENAND_DATARAM);
2455         if ((thisboundary >> FLEXONENAND_PI_UNLOCK_SHIFT) != 3) {
2456                 printk(KERN_ERR "flexonenand_set_boundary: boundary locked\n");
2457                 goto out;
2458         }
2459
2460         printk(KERN_INFO "flexonenand_set_boundary: Changing die %d boundary: %d%s\n",
2461                         die, boundary, lock ? "(Locked)" : "(Unlocked)");
2462
2463         boundary &= FLEXONENAND_PI_MASK;
2464         boundary |= lock ? 0 : (3 << FLEXONENAND_PI_UNLOCK_SHIFT);
2465
2466         addr = die ? this->diesize[0] : 0;
2467         this->command(mtd, ONENAND_CMD_ERASE, addr, 0);
2468         ret = this->wait(mtd, FL_ERASING);
2469         if (ret) {
2470                 printk("flexonenand_set_boundary:"
2471                         "Failed PI erase for Die %d\n", die);
2472                 goto out;
2473         }
2474
2475         this->write_word(boundary, this->base + ONENAND_DATARAM);
2476         this->command(mtd, ONENAND_CMD_PROG, addr, 0);
2477         ret = this->wait(mtd, FL_WRITING);
2478         if (ret) {
2479                 printk("flexonenand_set_boundary:"
2480                         "Failed PI write for Die %d\n", die);
2481                 goto out;
2482         }
2483
2484         this->command(mtd, FLEXONENAND_CMD_PI_UPDATE, die, 0);
2485         ret = this->wait(mtd, FL_WRITING);
2486 out:
2487         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_REG_COMMAND);
2488         this->wait(mtd, FL_RESETING);
2489         if (!ret)
2490                 /* Recalculate device size on boundary change*/
2491                 flexonenand_get_size(mtd);
2492
2493         return ret;
2494 }
2495
2496 /**
2497  * onenand_chip_probe - [OneNAND Interface] Probe the OneNAND chip
2498  * @param mtd           MTD device structure
2499  *
2500  * OneNAND detection method:
2501  *   Compare the the values from command with ones from register
2502  */
2503 static int onenand_chip_probe(struct mtd_info *mtd)
2504 {
2505         struct onenand_chip *this = mtd->priv;
2506         int bram_maf_id, bram_dev_id, maf_id, dev_id;
2507         int syscfg;
2508
2509         /* Save system configuration 1 */
2510         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2511
2512         /* Clear Sync. Burst Read mode to read BootRAM */
2513         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ),
2514                          this->base + ONENAND_REG_SYS_CFG1);
2515
2516         /* Send the command for reading device ID from BootRAM */
2517         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
2518
2519         /* Read manufacturer and device IDs from BootRAM */
2520         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
2521         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
2522
2523         /* Reset OneNAND to read default register values */
2524         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
2525
2526         /* Wait reset */
2527         this->wait(mtd, FL_RESETING);
2528
2529         /* Restore system configuration 1 */
2530         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2531
2532         /* Check manufacturer ID */
2533         if (onenand_check_maf(bram_maf_id))
2534                 return -ENXIO;
2535
2536         /* Read manufacturer and device IDs from Register */
2537         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
2538         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
2539
2540         /* Check OneNAND device */
2541         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
2542                 return -ENXIO;
2543
2544         return 0;
2545 }
2546
2547 /**
2548  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
2549  * @param mtd           MTD device structure
2550  *
2551  * OneNAND detection method:
2552  *   Compare the the values from command with ones from register
2553  */
2554 int onenand_probe(struct mtd_info *mtd)
2555 {
2556         struct onenand_chip *this = mtd->priv;
2557         int dev_id, ver_id;
2558         int density;
2559         int ret;
2560
2561         ret = this->chip_probe(mtd);
2562         if (ret)
2563                 return ret;
2564
2565         /* Read device IDs from Register */
2566         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
2567         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
2568         this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
2569
2570         /* Flash device information */
2571         mtd->name = onenand_print_device_info(dev_id, ver_id);
2572         this->device_id = dev_id;
2573         this->version_id = ver_id;
2574
2575         /* Check OneNAND features */
2576         onenand_check_features(mtd);
2577
2578         density = onenand_get_density(dev_id);
2579         if (FLEXONENAND(this)) {
2580                 this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
2581                 /* Maximum possible erase regions */
2582                 mtd->numeraseregions = this->dies << 1;
2583                 mtd->eraseregions = malloc(sizeof(struct mtd_erase_region_info)
2584                                         * (this->dies << 1));
2585                 if (!mtd->eraseregions)
2586                         return -ENOMEM;
2587         }
2588
2589         /*
2590          * For Flex-OneNAND, chipsize represents maximum possible device size.
2591          * mtd->size represents the actual device size.
2592          */
2593         this->chipsize = (16 << density) << 20;
2594
2595         /* OneNAND page size & block size */
2596         /* The data buffer size is equal to page size */
2597         mtd->writesize =
2598             this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
2599         /* We use the full BufferRAM */
2600         if (ONENAND_IS_4KB_PAGE(this))
2601                 mtd->writesize <<= 1;
2602
2603         mtd->oobsize = mtd->writesize >> 5;
2604         /* Pagers per block is always 64 in OneNAND */
2605         mtd->erasesize = mtd->writesize << 6;
2606         /*
2607          * Flex-OneNAND SLC area has 64 pages per block.
2608          * Flex-OneNAND MLC area has 128 pages per block.
2609          * Expose MLC erase size to find erase_shift and page_mask.
2610          */
2611         if (FLEXONENAND(this))
2612                 mtd->erasesize <<= 1;
2613
2614         this->erase_shift = ffs(mtd->erasesize) - 1;
2615         this->page_shift = ffs(mtd->writesize) - 1;
2616         this->ppb_shift = (this->erase_shift - this->page_shift);
2617         this->page_mask = (mtd->erasesize / mtd->writesize) - 1;
2618         /* Set density mask. it is used for DDP */
2619         if (ONENAND_IS_DDP(this))
2620                 this->density_mask = this->chipsize >> (this->erase_shift + 1);
2621         /* It's real page size */
2622         this->writesize = mtd->writesize;
2623
2624         /* REVIST: Multichip handling */
2625
2626         if (FLEXONENAND(this))
2627                 flexonenand_get_size(mtd);
2628         else
2629                 mtd->size = this->chipsize;
2630
2631         mtd->flags = MTD_CAP_NANDFLASH;
2632         mtd->_erase = onenand_erase;
2633         mtd->_read = onenand_read;
2634         mtd->_write = onenand_write;
2635         mtd->_read_oob = onenand_read_oob;
2636         mtd->_write_oob = onenand_write_oob;
2637         mtd->_sync = onenand_sync;
2638         mtd->_block_isbad = onenand_block_isbad;
2639         mtd->_block_markbad = onenand_block_markbad;
2640
2641         return 0;
2642 }
2643
2644 /**
2645  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
2646  * @param mtd           MTD device structure
2647  * @param maxchips      Number of chips to scan for
2648  *
2649  * This fills out all the not initialized function pointers
2650  * with the defaults.
2651  * The flash ID is read and the mtd/chip structures are
2652  * filled with the appropriate values.
2653  */
2654 int onenand_scan(struct mtd_info *mtd, int maxchips)
2655 {
2656         int i;
2657         struct onenand_chip *this = mtd->priv;
2658
2659         if (!this->read_word)
2660                 this->read_word = onenand_readw;
2661         if (!this->write_word)
2662                 this->write_word = onenand_writew;
2663
2664         if (!this->command)
2665                 this->command = onenand_command;
2666         if (!this->wait)
2667                 this->wait = onenand_wait;
2668         if (!this->bbt_wait)
2669                 this->bbt_wait = onenand_bbt_wait;
2670
2671         if (!this->read_bufferram)
2672                 this->read_bufferram = onenand_read_bufferram;
2673         if (!this->write_bufferram)
2674                 this->write_bufferram = onenand_write_bufferram;
2675
2676         if (!this->chip_probe)
2677                 this->chip_probe = onenand_chip_probe;
2678
2679         if (!this->block_markbad)
2680                 this->block_markbad = onenand_default_block_markbad;
2681         if (!this->scan_bbt)
2682                 this->scan_bbt = onenand_default_bbt;
2683
2684         if (onenand_probe(mtd))
2685                 return -ENXIO;
2686
2687         /* Set Sync. Burst Read after probing */
2688         if (this->mmcontrol) {
2689                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
2690                 this->read_bufferram = onenand_sync_read_bufferram;
2691         }
2692
2693         /* Allocate buffers, if necessary */
2694         if (!this->page_buf) {
2695                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
2696                 if (!this->page_buf) {
2697                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
2698                         return -ENOMEM;
2699                 }
2700                 this->options |= ONENAND_PAGEBUF_ALLOC;
2701         }
2702         if (!this->oob_buf) {
2703                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
2704                 if (!this->oob_buf) {
2705                         printk(KERN_ERR "onenand_scan: Can't allocate oob_buf\n");
2706                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
2707                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
2708                                 kfree(this->page_buf);
2709                         }
2710                         return -ENOMEM;
2711                 }
2712                 this->options |= ONENAND_OOBBUF_ALLOC;
2713         }
2714
2715         this->state = FL_READY;
2716
2717         /*
2718          * Allow subpage writes up to oobsize.
2719          */
2720         switch (mtd->oobsize) {
2721         case 128:
2722                 this->ecclayout = &onenand_oob_128;
2723                 mtd->subpage_sft = 0;
2724                 break;
2725
2726         case 64:
2727                 this->ecclayout = &onenand_oob_64;
2728                 mtd->subpage_sft = 2;
2729                 break;
2730
2731         case 32:
2732                 this->ecclayout = &onenand_oob_32;
2733                 mtd->subpage_sft = 1;
2734                 break;
2735
2736         default:
2737                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
2738                         mtd->oobsize);
2739                 mtd->subpage_sft = 0;
2740                 /* To prevent kernel oops */
2741                 this->ecclayout = &onenand_oob_32;
2742                 break;
2743         }
2744
2745         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
2746
2747         /*
2748          * The number of bytes available for a client to place data into
2749          * the out of band area
2750          */
2751         this->ecclayout->oobavail = 0;
2752         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
2753             this->ecclayout->oobfree[i].length; i++)
2754                 this->ecclayout->oobavail +=
2755                         this->ecclayout->oobfree[i].length;
2756         mtd->oobavail = this->ecclayout->oobavail;
2757
2758         mtd->ecclayout = this->ecclayout;
2759
2760         /* Unlock whole block */
2761         onenand_unlock_all(mtd);
2762
2763         return this->scan_bbt(mtd);
2764 }
2765
2766 /**
2767  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
2768  * @param mtd           MTD device structure
2769  */
2770 void onenand_release(struct mtd_info *mtd)
2771 {
2772 }