recovery/drivers/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
   8 #include <common.h>
   9 #include <linux/mtd/compat.h>
  10 #include <linux/mtd/mtd.h>
  11 #include <linux/mtd/onenand.h>
  12
  13 #include <asm/io.h>
  14 #include <asm/errno.h>
  15 #include <malloc.h>
  16
  17 #ifdef printk
  18 #undef printk
  19 #endif
  20 #define printk(...)     do {} while (0)
  21 #define puts(...)       do {} while (0)
  22
  23 extern void *memcpy32(void *dst, const void *src, int len);
  24
  25 /* It should access 16-bit instead of 8-bit */
  26 static void *memcpy_16(void *dst, const void *src, unsigned int len)
  27 {
  28         void *ret = dst;
  29         short *d = dst;
  30         const short *s = src;
  31
  32         if (len >= 32 && (len & (32 - 1)) == 0)
  33                 return memcpy32(dst, src, len);
  34
  35         len >>= 1;
  36         while (len-- > 0)
  37                 *d++ = *s++;
  38         return ret;
  39 }
  40
  41 /**
  42  *  onenand_oob_128 - oob info for Flex-Onenand with 4KB page
  43  *  For now, we expose only 64 out of 80 ecc bytes
  44  */
  45 static struct nand_ecclayout onenand_oob_128 = {
  46         .eccbytes       = 64,
  47         .eccpos         = {
  48                 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  49                 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  50                 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  51                 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
  52                 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
  53                 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
  54                 102, 103, 104, 105
  55         },
  56         .oobfree        = {
  57                 {2, 4}, {18, 4}, {34, 4}, {50, 4},
  58                 {66, 4}, {82, 4}, {98, 4}, {114, 4}
  59         }
  60 };
  61
  62 /**
  63  * onenand_oob_64 - oob info for large (2KB) page
  64  */
  65 static struct nand_ecclayout onenand_oob_64 = {
  66         .eccbytes       = 20,
  67         .eccpos         = {
  68                 8, 9, 10, 11, 12,
  69                 24, 25, 26, 27, 28,
  70                 40, 41, 42, 43, 44,
  71                 56, 57, 58, 59, 60,
  72                 },
  73         .oobfree        = {
  74                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  75                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  76         }
  77 };
  78
  79 /**
  80  * onenand_oob_32 - oob info for middle (1KB) page
  81  */
  82 static struct nand_ecclayout onenand_oob_32 = {
  83         .eccbytes       = 10,
  84         .eccpos         = {
  85                 8, 9, 10, 11, 12,
  86                 24, 25, 26, 27, 28,
  87                 },
  88         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  89 };
  90
  91 static const unsigned char ffchars[] __attribute__((aligned(4))) = {
  92         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  93         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  94         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  95         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  96         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  97         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  98         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  99         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
 100         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 101         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 80 */
 102         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 103         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 96 */
 104         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 105         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 112 */
 106         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 107         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128 */
 108 };
 109
 110 /**
 111  * from ../mtdpart.c to support callback
 112  */
 113 void mtd_erase_callback(struct erase_info *instr)
 114 {
 115         /* do noting */
 116 }
 117
 118 /**
 119  * onenand_readw - [OneNAND Interface] Read OneNAND register
 120  * @param addr          address to read
 121  *
 122  * Read OneNAND register
 123  */
 124 static unsigned short onenand_readw(void __iomem * addr)
 125 {
 126         return readw(addr);
 127 }
 128
 129 /**
 130  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
 131  * @param value         value to write
 132  * @param addr          address to write
 133  *
 134  * Write OneNAND register with value
 135  */
 136 static void onenand_writew(unsigned short value, void __iomem * addr)
 137 {
 138         writew(value, addr);
 139 }
 140
 141 /**
 142  * onenand_block_address - [DEFAULT] Get block address
 143  * @param device        the device id
 144  * @param block         the block
 145  * @return              translated block address if DDP, otherwise same
 146  *
 147  * Setup Start Address 1 Register (F100h)
 148  */
 149 static int onenand_block_address(struct onenand_chip *this, int block)
 150 {
 151         /* Device Flash Core select, NAND Flash Block Address */
 152         if (block & this->density_mask)
 153                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 154
 155         return block;
 156 }
 157
 158 /**
 159  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 160  * @param device        the device id
 161  * @param block         the block
 162  * @return              set DBS value if DDP, otherwise 0
 163  *
 164  * Setup Start Address 2 Register (F101h) for DDP
 165  */
 166 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 167 {
 168         /* Device BufferRAM Select */
 169         if (block & this->density_mask)
 170                 return ONENAND_DDP_CHIP1;
 171
 172         return ONENAND_DDP_CHIP0;
 173 }
 174
 175 /**
 176  * onenand_page_address - [DEFAULT] Get page address
 177  * @param page          the page address
 178  * @param sector        the sector address
 179  * @return              combined page and sector address
 180  *
 181  * Setup Start Address 8 Register (F107h)
 182  */
 183 static int onenand_page_address(int page, int sector)
 184 {
 185         /* Flash Page Address, Flash Sector Address */
 186         int fpa, fsa;
 187
 188         fpa = page & ONENAND_FPA_MASK;
 189         fsa = sector & ONENAND_FSA_MASK;
 190
 191         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 192 }
 193
 194 /**
 195  * onenand_buffer_address - [DEFAULT] Get buffer address
 196  * @param dataram1      DataRAM index
 197  * @param sectors       the sector address
 198  * @param count         the number of sectors
 199  * @return              the start buffer value
 200  *
 201  * Setup Start Buffer Register (F200h)
 202  */
 203 static int onenand_buffer_address(int dataram1, int sectors, int count)
 204 {
 205         int bsa, bsc;
 206
 207         /* BufferRAM Sector Address */
 208         bsa = sectors & ONENAND_BSA_MASK;
 209
 210         if (dataram1)
 211                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 212         else
 213                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 214
 215         /* BufferRAM Sector Count */
 216         bsc = count & ONENAND_BSC_MASK;
 217
 218         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 219 }
 220
 221 /**
 222  * flexonenand_block - Return block number for flash address
 223  * @param this          - OneNAND device structure
 224  * @param addr          - Address for which block number is needed
 225  */
 226 static unsigned int flexonenand_block(struct onenand_chip *this, loff_t addr)
 227 {
 228         unsigned int boundary, blk, die = 0;
 229
 230         if (ONENAND_IS_DDP(this) && addr >= this->diesize[0]) {
 231                 die = 1;
 232                 addr -= this->diesize[0];
 233         }
 234
 235         boundary = this->boundary[die];
 236
 237         blk = addr >> (this->erase_shift - 1);
 238         if (blk > boundary)
 239                 blk = (blk + boundary + 1) >> 1;
 240
 241         blk += die ? this->density_mask : 0;
 242         return blk;
 243 }
 244
 245 unsigned int onenand_block(struct onenand_chip *this, loff_t addr)
 246 {
 247         if (!FLEXONENAND(this))
 248                 return addr >> this->erase_shift;
 249         return flexonenand_block(this, addr);
 250 }
 251
 252 /**
 253  * flexonenand_addr - Return address of the block
 254  * @this:               OneNAND device structure
 255  * @block:              Block number on Flex-OneNAND
 256  *
 257  * Return address of the block
 258  */
 259 static loff_t flexonenand_addr(struct onenand_chip *this, int block)
 260 {
 261         loff_t ofs = 0;
 262         int die = 0, boundary;
 263
 264         if (ONENAND_IS_DDP(this) && block >= this->density_mask) {
 265                 block -= this->density_mask;
 266                 die = 1;
 267                 ofs = this->diesize[0];
 268         }
 269
 270         boundary = this->boundary[die];
 271         ofs += (loff_t) block << (this->erase_shift - 1);
 272         if (block > (boundary + 1))
 273                 ofs += (loff_t) (block - boundary - 1)
 274                         << (this->erase_shift - 1);
 275         return ofs;
 276 }
 277
 278 loff_t onenand_addr(struct onenand_chip *this, int block)
 279 {
 280         if (!FLEXONENAND(this))
 281                 return (loff_t) block << this->erase_shift;
 282         return flexonenand_addr(this, block);
 283 }
 284
 285 /**
 286  * flexonenand_region - [Flex-OneNAND] Return erase region of addr
 287  * @param mtd           MTD device structure
 288  * @param addr          address whose erase region needs to be identified
 289  */
 290 int flexonenand_region(struct mtd_info *mtd, loff_t addr)
 291 {
 292         int i;
 293
 294         for (i = 0; i < mtd->numeraseregions; i++)
 295                 if (addr < mtd->eraseregions[i].offset)
 296                         break;
 297         return i - 1;
 298 }
 299
 300 /**
 301  * onenand_get_density - [DEFAULT] Get OneNAND density
 302  * @param dev_id        OneNAND device ID
 303  *
 304  * Get OneNAND density from device ID
 305  */
 306 static inline int onenand_get_density(int dev_id)
 307 {
 308         int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 309         return (density & ONENAND_DEVICE_DENSITY_MASK);
 310 }
 311
 312 /**
 313  * onenand_command - [DEFAULT] Send command to OneNAND device
 314  * @param mtd           MTD device structure
 315  * @param cmd           the command to be sent
 316  * @param addr          offset to read from or write to
 317  * @param len           number of bytes to read or write
 318  *
 319  * Send command to OneNAND device. This function is used for middle/large page
 320  * devices (1KB/2KB Bytes per page)
 321  */
 322 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr,
 323                            size_t len)
 324 {
 325         struct onenand_chip *this = mtd->priv;
 326         int value, block, page;
 327
 328         /* Address translation */
 329         switch (cmd) {
 330         case ONENAND_CMD_UNLOCK:
 331         case ONENAND_CMD_LOCK:
 332         case ONENAND_CMD_LOCK_TIGHT:
 333         case ONENAND_CMD_UNLOCK_ALL:
 334                 block = -1;
 335                 page = -1;
 336                 break;
 337
 338         case FLEXONENAND_CMD_PI_ACCESS:
 339                 /* addr contains die index */
 340                 block = addr * this->density_mask;
 341                 page = -1;
 342                 break;
 343
 344         case ONENAND_CMD_ERASE:
 345         case ONENAND_CMD_BUFFERRAM:
 346                 block = onenand_block(this, addr);
 347                 page = -1;
 348                 break;
 349
 350         case FLEXONENAND_CMD_READ_PI:
 351                 cmd = ONENAND_CMD_READ;
 352                 block = addr * this->density_mask;
 353                 page = 0;
 354                 break;
 355
 356         default:
 357                 block = onenand_block(this, addr);
 358                 page = (int) (addr
 359                         - onenand_addr(this, block)) >> this->page_shift;
 360                 page &= this->page_mask;
 361                 break;
 362         }
 363
 364         /* NOTE: The setting order of the registers is very important! */
 365         if (cmd == ONENAND_CMD_BUFFERRAM) {
 366                 /* Select DataRAM for DDP */
 367                 value = onenand_bufferram_address(this, block);
 368                 this->write_word(value,
 369                                  this->base + ONENAND_REG_START_ADDRESS2);
 370
 371                 if (ONENAND_IS_4KB_PAGE(this))
 372                         /* It is always BufferRAM0 */
 373                         ONENAND_SET_BUFFERRAM0(this);
 374                 else
 375                         /* Switch to the next data buffer */
 376                         ONENAND_SET_NEXT_BUFFERRAM(this);
 377
 378                 return 0;
 379         }
 380
 381         if (block != -1) {
 382                 /* Write 'DFS, FBA' of Flash */
 383                 value = onenand_block_address(this, block);
 384                 this->write_word(value,
 385                                  this->base + ONENAND_REG_START_ADDRESS1);
 386
 387                 /* Select DataRAM for DDP */
 388                 value = onenand_bufferram_address(this, block);
 389                 this->write_word(value,
 390                                  this->base + ONENAND_REG_START_ADDRESS2);
 391         }
 392
 393         if (page != -1) {
 394                 /* Now we use page size operation */
 395                 int sectors = 0, count = 0;
 396                 int dataram;
 397
 398                 switch (cmd) {
 399                 case FLEXONENAND_CMD_RECOVER_LSB:
 400                 case ONENAND_CMD_READ:
 401                 case ONENAND_CMD_READOOB:
 402                 case ONENAND_CMD_SUPERLOAD:
 403                         if (ONENAND_IS_4KB_PAGE(this))
 404                                 /* It is always BufferRAM0 */
 405                                 dataram = ONENAND_SET_BUFFERRAM0(this);
 406                         else
 407                                 dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 408                         break;
 409
 410                 default:
 411                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 412                         break;
 413                 }
 414
 415                 /* Write 'FPA, FSA' of Flash */
 416                 value = onenand_page_address(page, sectors);
 417                 this->write_word(value,
 418                                  this->base + ONENAND_REG_START_ADDRESS8);
 419
 420                 /* Write 'BSA, BSC' of DataRAM */
 421                 value = onenand_buffer_address(dataram, sectors, count);
 422                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 423         }
 424
 425         /* Interrupt clear */
 426         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 427         /* Write command */
 428         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 429
 430         return 0;
 431 }
 432
 433 /**
 434  * onenand_read_ecc - return ecc status
 435  * @param this          onenand chip structure
 436  */
 437 static int onenand_read_ecc(struct onenand_chip *this)
 438 {
 439         int ecc, i;
 440
 441         if (!ONENAND_IS_4KB_PAGE(this))
 442                 return this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 443
 444         for (i = 0; i < 4; i++) {
 445                 ecc = this->read_word(this->base
 446                                 + ((ONENAND_REG_ECC_STATUS + i) << 1));
 447                 if (likely(!ecc))
 448                         continue;
 449                 if (ecc & FLEXONENAND_UNCORRECTABLE_ERROR)
 450                         return ONENAND_ECC_2BIT_ALL;
 451         }
 452
 453         return 0;
 454 }
 455
 456 /**
 457  * onenand_wait - [DEFAULT] wait until the command is done
 458  * @param mtd           MTD device structure
 459  * @param state         state to select the max. timeout value
 460  *
 461  * Wait for command done. This applies to all OneNAND command
 462  * Read can take up to 30us, erase up to 2ms and program up to 350us
 463  * according to general OneNAND specs
 464  */
 465 static int onenand_wait(struct mtd_info *mtd, int state)
 466 {
 467         struct onenand_chip *this = mtd->priv;
 468         unsigned int flags = ONENAND_INT_MASTER;
 469         unsigned int interrupt = 0;
 470         unsigned int ctrl;
 471
 472         while (1) {
 473                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 474                 if (interrupt & flags)
 475                         break;
 476         }
 477
 478         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 479
 480         if (interrupt & ONENAND_INT_READ) {
 481                 int ecc = onenand_read_ecc(this);
 482                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 483                         printk("onenand_wait: ECC error = 0x%04x\n", ecc);
 484                         return -EBADMSG;
 485                 }
 486         }
 487
 488         if (ctrl & ONENAND_CTRL_ERROR) {
 489                 printk("onenand_wait: controller error = 0x%04x\n", ctrl);
 490                 if (ctrl & ONENAND_CTRL_LOCK)
 491                         printk("onenand_wait: it's locked error = 0x%04x\n",
 492                                 ctrl);
 493
 494                 return -EIO;
 495         }
 496
 497         return 0;
 498 }
 499
 500 /**
 501  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 502  * @param mtd           MTD data structure
 503  * @param area          BufferRAM area
 504  * @return              offset given area
 505  *
 506  * Return BufferRAM offset given area
 507  */
 508 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 509 {
 510         struct onenand_chip *this = mtd->priv;
 511
 512         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 513                 if (area == ONENAND_DATARAM)
 514                         return mtd->writesize;
 515                 if (area == ONENAND_SPARERAM)
 516                         return mtd->oobsize;
 517         }
 518
 519         return 0;
 520 }
 521
 522 /**
 523  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 524  * @param mtd           MTD data structure
 525  * @param area          BufferRAM area
 526  * @param buffer        the databuffer to put/get data
 527  * @param offset        offset to read from or write to
 528  * @param count         number of bytes to read/write
 529  *
 530  * Read the BufferRAM area
 531  */
 532 static int onenand_read_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 533                                   unsigned char *buffer, int offset,
 534                                   size_t count)
 535 {
 536         struct onenand_chip *this = mtd->priv;
 537         void __iomem *bufferram;
 538
 539         bufferram = this->base + area;
 540         bufferram += onenand_bufferram_offset(mtd, area);
 541
 542         memcpy_16(buffer, bufferram + offset, count);
 543
 544         return 0;
 545 }
 546
 547 /**
 548  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 549  * @param mtd           MTD data structure
 550  * @param area          BufferRAM area
 551  * @param buffer        the databuffer to put/get data
 552  * @param offset        offset to read from or write to
 553  * @param count         number of bytes to read/write
 554  *
 555  * Write the BufferRAM area
 556  */
 557 static int onenand_write_bufferram(struct mtd_info *mtd, loff_t addr, int area,
 558                                    const unsigned char *buffer, int offset,
 559                                    size_t count)
 560 {
 561         struct onenand_chip *this = mtd->priv;
 562         void __iomem *bufferram;
 563
 564         bufferram = this->base + area;
 565         bufferram += onenand_bufferram_offset(mtd, area);
 566
 567         memcpy_16(bufferram + offset, buffer, count);
 568
 569         return 0;
 570 }
 571
 572 /**
 573  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 574  * @param mtd           MTD data structure
 575  * @param addr          address to check
 576  * @return              blockpage address
 577  *
 578  * Get blockpage address at 2x program mode
 579  */
 580 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 581 {
 582         struct onenand_chip *this = mtd->priv;
 583         int blockpage, block, page;
 584
 585         /* Calculate the even block number */
 586         block = (int) (addr >> this->erase_shift) & ~1;
 587         /* Is it the odd plane? */
 588         if (addr & this->writesize)
 589                 block++;
 590         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 591         blockpage = (block << 7) | page;
 592
 593         return blockpage;
 594 }
 595
 596 /**
 597  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 598  * @param mtd           MTD data structure
 599  * @param addr          address to check
 600  * @return              1 if there are valid data, otherwise 0
 601  *
 602  * Check bufferram if there is data we required
 603  */
 604 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 605 {
 606         struct onenand_chip *this = mtd->priv;
 607         int blockpage, found = 0;
 608         unsigned int i;
 609
 610         if (ONENAND_IS_2PLANE(this))
 611                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 612         else
 613                 blockpage = (int) (addr >> this->page_shift);
 614
 615         /* Is there valid data? */
 616         i = ONENAND_CURRENT_BUFFERRAM(this);
 617         if (this->bufferram[i].blockpage == blockpage)
 618                 found = 1;
 619         else {
 620                 /* Check another BufferRAM */
 621                 i = ONENAND_NEXT_BUFFERRAM(this);
 622                 if (this->bufferram[i].blockpage == blockpage) {
 623                         ONENAND_SET_NEXT_BUFFERRAM(this);
 624                         found = 1;
 625                 }
 626         }
 627
 628         if (found && ONENAND_IS_DDP(this)) {
 629                 /* Select DataRAM for DDP */
 630                 int block = onenand_block(this, addr);
 631                 int value = onenand_bufferram_address(this, block);
 632                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 633         }
 634
 635         return found;
 636 }
 637
 638 /**
 639  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 640  * @param mtd           MTD data structure
 641  * @param addr          address to update
 642  * @param valid         valid flag
 643  *
 644  * Update BufferRAM information
 645  */
 646 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 647                                     int valid)
 648 {
 649         struct onenand_chip *this = mtd->priv;
 650         int blockpage;
 651         unsigned int i;
 652
 653         if (ONENAND_IS_2PLANE(this))
 654                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 655         else
 656                 blockpage = (int)(addr >> this->page_shift);
 657
 658         /* Invalidate another BufferRAM */
 659         i = ONENAND_NEXT_BUFFERRAM(this);
 660         if (this->bufferram[i].blockpage == blockpage)
 661                 this->bufferram[i].blockpage = -1;
 662
 663         /* Update BufferRAM */
 664         i = ONENAND_CURRENT_BUFFERRAM(this);
 665         if (valid)
 666                 this->bufferram[i].blockpage = blockpage;
 667         else
 668                 this->bufferram[i].blockpage = -1;
 669
 670         return 0;
 671 }
 672
 673 /**
 674  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 675  * @param mtd           MTD data structure
 676  * @param addr          start address to invalidate
 677  * @param len           length to invalidate
 678  *
 679  * Invalidate BufferRAM information
 680  */
 681 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 682                                          unsigned int len)
 683 {
 684         struct onenand_chip *this = mtd->priv;
 685         int i;
 686         loff_t end_addr = addr + len;
 687
 688         /* Invalidate BufferRAM */
 689         for (i = 0; i < MAX_BUFFERRAM; i++) {
 690                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 691
 692                 if (buf_addr >= addr && buf_addr < end_addr)
 693                         this->bufferram[i].blockpage = -1;
 694         }
 695 }
 696
 697 /**
 698  * onenand_get_device - [GENERIC] Get chip for selected access
 699  * @param mtd           MTD device structure
 700  * @param new_state     the state which is requested
 701  *
 702  * Get the device and lock it for exclusive access
 703  */
 704 static void onenand_get_device(struct mtd_info *mtd, int new_state)
 705 {
 706         /* Do nothing */
 707 }
 708
 709 /**
 710  * onenand_release_device - [GENERIC] release chip
 711  * @param mtd           MTD device structure
 712  *
 713  * Deselect, release chip lock and wake up anyone waiting on the device
 714  */
 715 static void onenand_release_device(struct mtd_info *mtd)
 716 {
 717         /* Do nothing */
 718 }
 719
 720 /**
 721  * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
 722  * @param mtd           MTD device structure
 723  * @param buf           destination address
 724  * @param column        oob offset to read from
 725  * @param thislen       oob length to read
 726  */
 727 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf,
 728                                         int column, int thislen)
 729 {
 730         struct onenand_chip *this = mtd->priv;
 731         struct nand_oobfree *free;
 732         int readcol = column;
 733         int readend = column + thislen;
 734         int lastgap = 0;
 735         unsigned int i;
 736         uint8_t *oob_buf = this->oob_buf;
 737
 738         free = this->ecclayout->oobfree;
 739         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 740                 if (readcol >= lastgap)
 741                         readcol += free->offset - lastgap;
 742                 if (readend >= lastgap)
 743                         readend += free->offset - lastgap;
 744                 lastgap = free->offset + free->length;
 745         }
 746         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 747         free = this->ecclayout->oobfree;
 748         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 749                 int free_end = free->offset + free->length;
 750                 if (free->offset < readend && free_end > readcol) {
 751                         int st = max_t(int,free->offset,readcol);
 752                         int ed = min_t(int,free_end,readend);
 753                         int n = ed - st;
 754                         memcpy(buf, oob_buf + st, n);
 755                         buf += n;
 756                 } else if (column == 0)
 757                         break;
 758         }
 759         return 0;
 760 }
 761
 762 /**
 763  * onenand_recover_lsb - [Flex-OneNAND] Recover LSB page data
 764  * @param mtd           MTD device structure
 765  * @param addr          address to recover
 766  * @param status        return value from onenand_wait
 767  *
 768  * MLC NAND Flash cell has paired pages - LSB page and MSB page. LSB page has
 769  * lower page address and MSB page has higher page address in paired pages.
 770  * If power off occurs during MSB page program, the paired LSB page data can
 771  * become corrupt. LSB page recovery read is a way to read LSB page though page
 772  * data are corrupted. When uncorrectable error occurs as a result of LSB page
 773  * read after power up, issue LSB page recovery read.
 774  */
 775 static int onenand_recover_lsb(struct mtd_info *mtd, loff_t addr, int status)
 776 {
 777         struct onenand_chip *this = mtd->priv;
 778         int i;
 779
 780         /* Recovery is only for Flex-OneNAND */
 781         if (!FLEXONENAND(this))
 782                 return status;
 783
 784         /* check if we failed due to uncorrectable error */
 785         if (status != -EBADMSG && status != ONENAND_BBT_READ_ECC_ERROR)
 786                 return status;
 787
 788         /* check if address lies in MLC region */
 789         i = flexonenand_region(mtd, addr);
 790         if (mtd->eraseregions[i].erasesize < (1 << this->erase_shift))
 791                 return status;
 792
 793         printk("onenand_recover_lsb:"
 794                 "Attempting to recover from uncorrectable read\n");
 795
 796         /* Issue the LSB page recovery command */
 797         this->command(mtd, FLEXONENAND_CMD_RECOVER_LSB, addr, this->writesize);
 798         return this->wait(mtd, FL_READING);
 799 }
 800
 801 /**
 802  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
 803  * @param mtd           MTD device structure
 804  * @param from          offset to read from
 805  * @param ops           oob operation description structure
 806  *
 807  * OneNAND read main and/or out-of-band data
 808  */
 809 static int onenand_normal_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 810                 struct mtd_oob_ops *ops)
 811 {
 812         struct onenand_chip *this = mtd->priv;
 813         struct mtd_ecc_stats stats;
 814         size_t len = ops->len;
 815         size_t ooblen = ops->ooblen;
 816         u_char *buf = ops->datbuf;
 817         u_char *oobbuf = ops->oobbuf;
 818         int read = 0, column, thislen;
 819         int oobread = 0, oobcolumn, thisooblen, oobsize;
 820         int ret = 0, boundary = 0;
 821         int writesize = this->writesize;
 822
 823         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 824
 825         if (ops->mode == MTD_OOB_AUTO)
 826                 oobsize = this->ecclayout->oobavail;
 827         else
 828                 oobsize = mtd->oobsize;
 829
 830         oobcolumn = from & (mtd->oobsize - 1);
 831
 832         /* Do not allow reads past end of device */
 833         if ((from + len) > mtd->size) {
 834                 printk(KERN_ERR "onenand_read_ops_nolock: Attempt read beyond end of device\n");
 835                 ops->retlen = 0;
 836                 ops->oobretlen = 0;
 837                 return -EINVAL;
 838         }
 839
 840         stats = mtd->ecc_stats;
 841
 842         /* Read-while-load method */
 843         /* Note: We can't use this feature in MLC */
 844
 845         /* Do first load to bufferRAM */
 846         if (read < len) {
 847                 if (!onenand_check_bufferram(mtd, from)) {
 848                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 849                         ret = this->wait(mtd, FL_READING);
 850                         if (unlikely(ret))
 851                                 ret = onenand_recover_lsb(mtd, from, ret);
 852                         onenand_update_bufferram(mtd, from, !ret);
 853                         if (ret == -EBADMSG)
 854                                 ret = 0;
 855                 }
 856         }
 857
 858         thislen = min_t(int, writesize, len - read);
 859         column = from & (writesize - 1);
 860         if (column + thislen > writesize)
 861                 thislen = writesize - column;
 862
 863         while (!ret) {
 864                 /* If there is more to load then start next load */
 865                 from += thislen;
 866
 867                 if (ONENAND_IS_4KB_PAGE(this))
 868                         goto skip_read_while_load;
 869
 870                 if (read + thislen < len) {
 871                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 872                         /*
 873                          * Chip boundary handling in DDP
 874                          * Now we issued chip 1 read and pointed chip 1
 875                          * bufferam so we have to point chip 0 bufferam.
 876                          */
 877                         if (ONENAND_IS_DDP(this) &&
 878                                         unlikely(from == (this->chipsize >> 1))) {
 879                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
 880                                 boundary = 1;
 881                         } else
 882                                 boundary = 0;
 883                         ONENAND_SET_PREV_BUFFERRAM(this);
 884                 }
 885 skip_read_while_load:
 886                 /* While load is going, read from last bufferRAM */
 887                 this->read_bufferram(mtd, from - thislen, ONENAND_DATARAM, buf, column, thislen);
 888
 889                 /* Read oob area if needed */
 890                 if (oobbuf) {
 891                         thisooblen = oobsize - oobcolumn;
 892                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
 893
 894                         if (ops->mode == MTD_OOB_AUTO)
 895                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
 896                         else
 897                                 this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
 898                         oobread += thisooblen;
 899                         oobbuf += thisooblen;
 900                         oobcolumn = 0;
 901                 }
 902
 903                 /* See if we are done */
 904                 read += thislen;
 905                 if (read == len)
 906                         break;
 907                 /* Set up for next read from bufferRAM */
 908                 if (unlikely(boundary))
 909                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
 910                 if (ONENAND_IS_4KB_PAGE(this))
 911                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 912                 else
 913                         ONENAND_SET_NEXT_BUFFERRAM(this);
 914                 buf += thislen;
 915                 thislen = min_t(int, writesize, len - read);
 916                 column = 0;
 917
 918                 if (ONENAND_IS_4KB_PAGE(this)) {
 919                         /* Now wait for load */
 920                         ret = this->wait(mtd, FL_READING);
 921                         onenand_update_bufferram(mtd, from, !ret);
 922                         if (ret == -EBADMSG)
 923                                 ret = 0;
 924                 }
 925         }
 926
 927         /*
 928          * Return success, if no ECC failures, else -EBADMSG
 929          * fs driver will take care of that, because
 930          * retlen == desired len and result == -EBADMSG
 931          */
 932         ops->retlen = read;
 933         ops->oobretlen = oobread;
 934
 935         if (ret)
 936                 return ret;
 937
 938         if (mtd->ecc_stats.failed - stats.failed)
 939                 return -EBADMSG;
 940
 941         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 942 }
 943
 944 static int onenand_superload_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 945                 struct mtd_oob_ops *ops)
 946 {
 947         struct onenand_chip *this = mtd->priv;
 948         struct mtd_ecc_stats stats;
 949         size_t len = ops->len;
 950         size_t ooblen = ops->ooblen;
 951         u_char *buf = ops->datbuf;
 952         u_char *oobbuf = ops->oobbuf;
 953         int read = 0, column, thislen;
 954         int oobread = 0, oobcolumn, thisooblen, oobsize;
 955         int ret = 0, boundary = 0;
 956         int writesize = this->writesize;
 957
 958         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 959
 960         if (ops->mode == MTD_OOB_AUTO)
 961                 oobsize = this->ecclayout->oobavail;
 962         else
 963                 oobsize = mtd->oobsize;
 964
 965         oobcolumn = from & (mtd->oobsize - 1);
 966
 967         /* Do not allow reads past end of device */
 968         if ((from + len) > mtd->size) {
 969                 printk(KERN_ERR "onenand_read_ops_nolock: Attempt read beyond end of device\n");
 970                 ops->retlen = 0;
 971                 ops->oobretlen = 0;
 972                 return -EINVAL;
 973         }
 974
 975         stats = mtd->ecc_stats;
 976
 977         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 978         ret = this->wait(mtd, FL_READING);
 979         if (unlikely(ret))
 980                 ret = onenand_recover_lsb(mtd, from, ret);
 981         onenand_update_bufferram(mtd, from, !ret);
 982         if (ret == -EBADMSG)
 983                 ret = 0;
 984
 985         thislen = min_t(int, writesize, len - read);
 986         column = from & (writesize - 1);
 987         if (column + thislen > writesize)
 988                 thislen = writesize - column;
 989
 990         while (!ret) {
 991                 /* If there is more to load then start next load */
 992                 from += thislen;
 993
 994                 if (read + thislen < len) {
 995                         this->command(mtd, ONENAND_CMD_SUPERLOAD, from, writesize);
 996                         /*
 997                          * Chip boundary handling in DDP
 998                          * Now we issued chip 1 read and pointed chip 1
 999                          * bufferam so we have to point chip 0 bufferam.
1000                          */
1001                         if (ONENAND_IS_DDP(this) &&
1002                                         unlikely(from == (this->chipsize >> 1))) {
1003                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
1004                                 boundary = 1;
1005                         } else
1006                                 boundary = 0;
1007                 }
1008                 /* While load is going, read from last bufferRAM */
1009                 this->read_bufferram(mtd, from - thislen, ONENAND_DATARAM, buf, column, thislen);
1010
1011                 /* Read oob area if needed */
1012                 if (oobbuf) {
1013                         thisooblen = oobsize - oobcolumn;
1014                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
1015
1016                         if (ops->mode == MTD_OOB_AUTO)
1017                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
1018                         else
1019                                 this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
1020                         oobread += thisooblen;
1021                         oobbuf += thisooblen;
1022                         oobcolumn = 0;
1023                 } else {
1024                         /* It should be read at least 4 bytes
1025                          * to the end of the spare area
1026                          */
1027                         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, this->oob_buf, 0, mtd->oobsize);
1028                 }
1029
1030                 /* See if we are done */
1031                 read += thislen;
1032                 if (read == len)
1033                         break;
1034                 /* Set up for next read from bufferRAM */
1035                 if (unlikely(boundary))
1036                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
1037
1038                 buf += thislen;
1039                 thislen = min_t(int, writesize, len - read);
1040                 column = 0;
1041
1042                 /* Now wait for load */
1043                 ret = this->wait(mtd, FL_READING);
1044                 onenand_update_bufferram(mtd, from, !ret);
1045                 if (ret == -EBADMSG)
1046                         ret = 0;
1047         }
1048
1049         /*
1050          * Return success, if no ECC failures, else -EBADMSG
1051          * fs driver will take care of that, because
1052          * retlen == desired len and result == -EBADMSG
1053          */
1054         ops->retlen = read;
1055         ops->oobretlen = oobread;
1056
1057         if (ret)
1058                 return ret;
1059
1060         if (mtd->ecc_stats.failed - stats.failed)
1061                 return -EBADMSG;
1062
1063         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
1064 }
1065
1066 /**
1067  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
1068  * @param mtd           MTD device structure
1069  * @param from          offset to read from
1070  * @param ops           oob operation description structure
1071  *
1072  * OneNAND read main and/or out-of-band data
1073  */
1074 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
1075                 struct mtd_oob_ops *ops)
1076 {
1077         struct onenand_chip *this = mtd->priv;
1078
1079         if (ONENAND_IS_4KB_PAGE(this) && ONENAND_IS_SYNC_MODE(this))
1080                 return onenand_superload_read_ops_nolock(mtd, from, ops);
1081
1082         return onenand_normal_read_ops_nolock(mtd, from, ops);
1083 }
1084
1085
1086 /**
1087  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
1088  * @param mtd           MTD device structure
1089  * @param from          offset to read from
1090  * @param ops           oob operation description structure
1091  *
1092  * OneNAND read out-of-band data from the spare area
1093  */
1094 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
1095                 struct mtd_oob_ops *ops)
1096 {
1097         struct onenand_chip *this = mtd->priv;
1098         struct mtd_ecc_stats stats;
1099         int read = 0, thislen, column, oobsize;
1100         size_t len = ops->ooblen;
1101         mtd_oob_mode_t mode = ops->mode;
1102         u_char *buf = ops->oobbuf;
1103         int ret = 0, readcmd;
1104
1105         from += ops->ooboffs;
1106
1107         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
1108
1109         /* Initialize return length value */
1110         ops->oobretlen = 0;
1111
1112         if (mode == MTD_OOB_AUTO)
1113                 oobsize = this->ecclayout->oobavail;
1114         else
1115                 oobsize = mtd->oobsize;
1116
1117         column = from & (mtd->oobsize - 1);
1118
1119         if (unlikely(column >= oobsize)) {
1120                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to start read outside oob\n");
1121                 return -EINVAL;
1122         }
1123
1124         /* Do not allow reads past end of device */
1125         if (unlikely(from >= mtd->size ||
1126                 column + len > ((mtd->size >> this->page_shift) -
1127                                 (from >> this->page_shift)) * oobsize)) {
1128                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to read beyond end of device\n");
1129                 return -EINVAL;
1130         }
1131
1132         stats = mtd->ecc_stats;
1133
1134         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1135
1136         while (read < len) {
1137                 thislen = oobsize - column;
1138                 thislen = min_t(int, thislen, len);
1139
1140                 this->command(mtd, readcmd, from, mtd->oobsize);
1141
1142                 onenand_update_bufferram(mtd, from, 0);
1143
1144                 ret = this->wait(mtd, FL_READING);
1145                 if (unlikely(ret))
1146                         ret = onenand_recover_lsb(mtd, from, ret);
1147
1148                 if (ret && ret != -EBADMSG) {
1149                         printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
1150                         break;
1151                 }
1152
1153                 if (mode == MTD_OOB_AUTO)
1154                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
1155                 else
1156                         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, buf, column, thislen);
1157
1158                 read += thislen;
1159
1160                 if (read == len)
1161                         break;
1162
1163                 buf += thislen;
1164
1165                 /* Read more? */
1166                 if (read < len) {
1167                         /* Page size */
1168                         from += mtd->writesize;
1169                         column = 0;
1170                 }
1171         }
1172
1173         ops->oobretlen = read;
1174
1175         if (ret)
1176                 return ret;
1177
1178         if (mtd->ecc_stats.failed - stats.failed)
1179                 return -EBADMSG;
1180
1181         return 0;
1182 }
1183
1184 /**
1185  * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
1186  * @param mtd           MTD device structure
1187  * @param from          offset to read from
1188  * @param len           number of bytes to read
1189  * @param retlen        pointer to variable to store the number of read bytes
1190  * @param buf           the databuffer to put data
1191  *
1192  * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
1193 */
1194 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
1195                  size_t * retlen, u_char * buf)
1196 {
1197         struct mtd_oob_ops ops = {
1198                 .len    = len,
1199                 .ooblen = 0,
1200                 .datbuf = buf,
1201                 .oobbuf = NULL,
1202         };
1203         int ret;
1204
1205         onenand_get_device(mtd, FL_READING);
1206         ret = onenand_read_ops_nolock(mtd, from, &ops);
1207         onenand_release_device(mtd);
1208
1209         *retlen = ops.retlen;
1210         return ret;
1211 }
1212
1213 /**
1214  * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
1215  * @param mtd           MTD device structure
1216  * @param from          offset to read from
1217  * @param ops           oob operations description structure
1218  *
1219  * OneNAND main and/or out-of-band
1220  */
1221 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
1222                         struct mtd_oob_ops *ops)
1223 {
1224         int ret;
1225
1226         switch (ops->mode) {
1227         case MTD_OOB_PLACE:
1228         case MTD_OOB_AUTO:
1229                 break;
1230         case MTD_OOB_RAW:
1231                 /* Not implemented yet */
1232         default:
1233                 return -EINVAL;
1234         }
1235
1236         onenand_get_device(mtd, FL_READING);
1237         if (ops->datbuf)
1238                 ret = onenand_read_ops_nolock(mtd, from, ops);
1239         else
1240                 ret = onenand_read_oob_nolock(mtd, from, ops);
1241         onenand_release_device(mtd);
1242
1243         return ret;
1244 }
1245
1246 /**
1247  * onenand_bbt_wait - [DEFAULT] wait until the command is done
1248  * @param mtd           MTD device structure
1249  * @param state         state to select the max. timeout value
1250  *
1251  * Wait for command done.
1252  */
1253 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
1254 {
1255         struct onenand_chip *this = mtd->priv;
1256         unsigned int flags = ONENAND_INT_MASTER;
1257         unsigned int interrupt;
1258         unsigned int ctrl;
1259
1260         while (1) {
1261                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1262                 if (interrupt & flags)
1263                         break;
1264         }
1265
1266         /* To get correct interrupt status in timeout case */
1267         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1268         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
1269
1270         if (interrupt & ONENAND_INT_READ) {
1271                 int ecc = onenand_read_ecc(this);
1272                 if (ecc & ONENAND_ECC_2BIT_ALL) {
1273                         printk(KERN_INFO "onenand_bbt_wait: ecc error = 0x%04x"
1274                                 ", controller = 0x%04x\n", ecc, ctrl);
1275                         return ONENAND_BBT_READ_ERROR;
1276                 }
1277         } else {
1278                 printk(KERN_ERR "onenand_bbt_wait: read timeout!"
1279                                 "ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
1280                 return ONENAND_BBT_READ_FATAL_ERROR;
1281         }
1282
1283         /* Initial bad block case: 0x2400 or 0x0400 */
1284         if (ctrl & ONENAND_CTRL_ERROR) {
1285                 printk(KERN_DEBUG "onenand_bbt_wait: controller error = 0x%04x\n", ctrl);
1286                 return ONENAND_BBT_READ_ERROR;
1287         }
1288
1289         return 0;
1290 }
1291
1292 /**
1293  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
1294  * @param mtd           MTD device structure
1295  * @param from          offset to read from
1296  * @param ops           oob operation description structure
1297  *
1298  * OneNAND read out-of-band data from the spare area for bbt scan
1299  */
1300 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
1301                 struct mtd_oob_ops *ops)
1302 {
1303         struct onenand_chip *this = mtd->priv;
1304         int read = 0, thislen, column;
1305         int ret = 0, readcmd;
1306         size_t len = ops->ooblen;
1307         u_char *buf = ops->oobbuf;
1308
1309         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %zi\n", (unsigned int) from, len);
1310
1311         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1312
1313         /* Initialize return value */
1314         ops->oobretlen = 0;
1315
1316         /* Do not allow reads past end of device */
1317         if (unlikely((from + len) > mtd->size)) {
1318                 printk(KERN_ERR "onenand_bbt_read_oob: Attempt read beyond end of device\n");
1319                 return ONENAND_BBT_READ_FATAL_ERROR;
1320         }
1321
1322         /* Grab the lock and see if the device is available */
1323         onenand_get_device(mtd, FL_READING);
1324
1325         column = from & (mtd->oobsize - 1);
1326
1327         while (read < len) {
1328
1329                 thislen = mtd->oobsize - column;
1330                 thislen = min_t(int, thislen, len);
1331
1332                 this->command(mtd, readcmd, from, mtd->oobsize);
1333
1334                 onenand_update_bufferram(mtd, from, 0);
1335
1336                 ret = this->bbt_wait(mtd, FL_READING);
1337                 if (unlikely(ret))
1338                         ret = onenand_recover_lsb(mtd, from, ret);
1339
1340                 if (ret)
1341                         break;
1342
1343                 this->read_bufferram(mtd, 0, ONENAND_SPARERAM, buf, column, thislen);
1344                 read += thislen;
1345                 if (read == len)
1346                         break;
1347
1348                 buf += thislen;
1349
1350                 /* Read more? */
1351                 if (read < len) {
1352                         /* Update Page size */
1353                         from += this->writesize;
1354                         column = 0;
1355                 }
1356         }
1357
1358         /* Deselect and wake up anyone waiting on the device */
1359         onenand_release_device(mtd);
1360
1361         ops->oobretlen = read;
1362         return ret;
1363 }
1364
1365 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1366 /**
1367  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1368  * @param mtd           MTD device structure
1369  * @param buf           the databuffer to verify
1370  * @param to            offset to read from
1371  */
1372 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1373 {
1374         struct onenand_chip *this = mtd->priv;
1375         u_char *oob_buf = this->oob_buf;
1376         int status, i, readcmd;
1377
1378         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1379
1380         this->command(mtd, readcmd, to, mtd->oobsize);
1381         onenand_update_bufferram(mtd, to, 0);
1382         status = this->wait(mtd, FL_READING);
1383         if (status)
1384                 return status;
1385
1386         this->read_bufferram(mtd, 0, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1387         for (i = 0; i < mtd->oobsize; i++)
1388                 if (buf[i] != 0xFF && buf[i] != oob_buf[i])
1389                         return -EBADMSG;
1390
1391         return 0;
1392 }
1393
1394 /**
1395  * onenand_verify - [GENERIC] verify the chip contents after a write
1396  * @param mtd          MTD device structure
1397  * @param buf          the databuffer to verify
1398  * @param addr         offset to read from
1399  * @param len          number of bytes to read and compare
1400  */
1401 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1402 {
1403         struct onenand_chip *this = mtd->priv;
1404         int ret = 0;
1405         int thislen, column;
1406
1407         while (len != 0) {
1408                 thislen = min_t(int, this->writesize, len);
1409                 column = addr & (this->writesize - 1);
1410                 if (column + thislen > this->writesize)
1411                         thislen = this->writesize - column;
1412
1413                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1414
1415                 onenand_update_bufferram(mtd, addr, 0);
1416
1417                 ret = this->wait(mtd, FL_READING);
1418                 if (ret)
1419                         return ret;
1420
1421                 onenand_update_bufferram(mtd, addr, 1);
1422
1423                 this->read_bufferram(mtd, 0, ONENAND_DATARAM, this->verify_buf, 0, mtd->writesize);
1424
1425                 if (memcmp(buf, this->verify_buf, thislen))
1426                         return -EBADMSG;
1427
1428                 len -= thislen;
1429                 buf += thislen;
1430                 addr += thislen;
1431         }
1432
1433         return 0;
1434 }
1435 #else
1436 #define onenand_verify(...)             (0)
1437 #define onenand_verify_oob(...)         (0)
1438 #endif
1439
1440 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1441
1442 /**
1443  * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
1444  * @param mtd           MTD device structure
1445  * @param oob_buf       oob buffer
1446  * @param buf           source address
1447  * @param column        oob offset to write to
1448  * @param thislen       oob length to write
1449  */
1450 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1451                 const u_char *buf, int column, int thislen)
1452 {
1453         struct onenand_chip *this = mtd->priv;
1454         struct nand_oobfree *free;
1455         int writecol = column;
1456         int writeend = column + thislen;
1457         int lastgap = 0;
1458         unsigned int i;
1459
1460         free = this->ecclayout->oobfree;
1461         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1462                 if (writecol >= lastgap)
1463                         writecol += free->offset - lastgap;
1464                 if (writeend >= lastgap)
1465                         writeend += free->offset - lastgap;
1466                 lastgap = free->offset + free->length;
1467         }
1468         free = this->ecclayout->oobfree;
1469         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1470                 int free_end = free->offset + free->length;
1471                 if (free->offset < writeend && free_end > writecol) {
1472                         int st = max_t(int,free->offset,writecol);
1473                         int ed = min_t(int,free_end,writeend);
1474                         int n = ed - st;
1475                         memcpy(oob_buf + st, buf, n);
1476                         buf += n;
1477                 } else if (column == 0)
1478                         break;
1479         }
1480         return 0;
1481 }
1482
1483 /**
1484  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1485  * @param mtd           MTD device structure
1486  * @param to            offset to write to
1487  * @param ops           oob operation description structure
1488  *
1489  * Write main and/or oob with ECC
1490  */
1491 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1492                 struct mtd_oob_ops *ops)
1493 {
1494         struct onenand_chip *this = mtd->priv;
1495         int written = 0, column, thislen, subpage;
1496         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1497         size_t len = ops->len;
1498         size_t ooblen = ops->ooblen;
1499         const u_char *buf = ops->datbuf;
1500         const u_char *oob = ops->oobbuf;
1501         u_char *oobbuf;
1502         int ret = 0;
1503
1504         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ops_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1505
1506         /* Initialize retlen, in case of early exit */
1507         ops->retlen = 0;
1508         ops->oobretlen = 0;
1509
1510         /* Do not allow writes past end of device */
1511         if (unlikely((to + len) > mtd->size)) {
1512                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt write to past end of device\n");
1513                 return -EINVAL;
1514         }
1515
1516         /* Reject writes, which are not page aligned */
1517         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1518                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
1519                 return -EINVAL;
1520         }
1521
1522         if (ops->mode == MTD_OOB_AUTO)
1523                 oobsize = this->ecclayout->oobavail;
1524         else
1525                 oobsize = mtd->oobsize;
1526
1527         oobcolumn = to & (mtd->oobsize - 1);
1528
1529         column = to & (mtd->writesize - 1);
1530
1531         /* Loop until all data write */
1532         while (written < len) {
1533                 u_char *wbuf = (u_char *) buf;
1534
1535                 thislen = min_t(int, mtd->writesize - column, len - written);
1536                 thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1537
1538                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1539
1540                 /* Partial page write */
1541                 subpage = thislen < mtd->writesize;
1542                 if (subpage) {
1543                         memset(this->page_buf, 0xff, mtd->writesize);
1544                         memcpy(this->page_buf + column, buf, thislen);
1545                         wbuf = this->page_buf;
1546                 }
1547
1548                 this->write_bufferram(mtd, to, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1549
1550                 if (oob) {
1551                         oobbuf = this->oob_buf;
1552
1553                         /* We send data to spare ram with oobsize
1554                          *                          * to prevent byte access */
1555                         memset(oobbuf, 0xff, mtd->oobsize);
1556                         if (ops->mode == MTD_OOB_AUTO)
1557                                 onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1558                         else
1559                                 memcpy(oobbuf + oobcolumn, oob, thisooblen);
1560
1561                         oobwritten += thisooblen;
1562                         oob += thisooblen;
1563                         oobcolumn = 0;
1564                 } else
1565                         oobbuf = (u_char *) ffchars;
1566
1567                 this->write_bufferram(mtd, to, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1568
1569                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1570
1571                 ret = this->wait(mtd, FL_WRITING);
1572
1573                 /* In partial page write we don't update bufferram */
1574                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1575                 if (ONENAND_IS_2PLANE(this)) {
1576                         ONENAND_SET_BUFFERRAM1(this);
1577                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1578                 }
1579
1580                 if (ret) {
1581                         printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
1582                         break;
1583                 }
1584
1585                 /* Only check verify write turn on */
1586                 ret = onenand_verify(mtd, buf, to, thislen);
1587                 if (ret) {
1588                         printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
1589                         break;
1590                 }
1591
1592                 written += thislen;
1593
1594                 if (written == len)
1595                         break;
1596
1597                 column = 0;
1598                 to += thislen;
1599                 buf += thislen;
1600         }
1601
1602         ops->retlen = written;
1603
1604         return ret;
1605 }
1606
1607 /**
1608  * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
1609  * @param mtd           MTD device structure
1610  * @param to            offset to write to
1611  * @param len           number of bytes to write
1612  * @param retlen        pointer to variable to store the number of written bytes
1613  * @param buf           the data to write
1614  * @param mode          operation mode
1615  *
1616  * OneNAND write out-of-band
1617  */
1618 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
1619                 struct mtd_oob_ops *ops)
1620 {
1621         struct onenand_chip *this = mtd->priv;
1622         int column, ret = 0, oobsize;
1623         int written = 0, oobcmd;
1624         u_char *oobbuf;
1625         size_t len = ops->ooblen;
1626         const u_char *buf = ops->oobbuf;
1627         mtd_oob_mode_t mode = ops->mode;
1628
1629         to += ops->ooboffs;
1630
1631         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1632
1633         /* Initialize retlen, in case of early exit */
1634         ops->oobretlen = 0;
1635
1636         if (mode == MTD_OOB_AUTO)
1637                 oobsize = this->ecclayout->oobavail;
1638         else
1639                 oobsize = mtd->oobsize;
1640
1641         column = to & (mtd->oobsize - 1);
1642
1643         if (unlikely(column >= oobsize)) {
1644                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to start write outside oob\n");
1645                 return -EINVAL;
1646         }
1647
1648         /* For compatibility with NAND: Do not allow write past end of page */
1649         if (unlikely(column + len > oobsize)) {
1650                 printk(KERN_ERR "onenand_write_oob_nolock: "
1651                                 "Attempt to write past end of page\n");
1652                 return -EINVAL;
1653         }
1654
1655         /* Do not allow reads past end of device */
1656         if (unlikely(to >= mtd->size ||
1657                                 column + len > ((mtd->size >> this->page_shift) -
1658                                         (to >> this->page_shift)) * oobsize)) {
1659                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to write past end of device\n");
1660                 return -EINVAL;
1661         }
1662
1663         oobbuf = this->oob_buf;
1664
1665         oobcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_PROG : ONENAND_CMD_PROGOOB;
1666
1667         /* Loop until all data write */
1668         while (written < len) {
1669                 int thislen = min_t(int, oobsize, len - written);
1670
1671                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
1672
1673                 /* We send data to spare ram with oobsize
1674                  * to prevent byte access */
1675                 memset(oobbuf, 0xff, mtd->oobsize);
1676                 if (mode == MTD_OOB_AUTO)
1677                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
1678                 else
1679                         memcpy(oobbuf + column, buf, thislen);
1680                 this->write_bufferram(mtd, 0, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1681
1682                 if (ONENAND_IS_MLC(this)) {
1683                         /* Set main area of DataRAM to 0xff*/
1684                         memset(this->page_buf, 0xff, mtd->writesize);
1685                         this->write_bufferram(mtd, 0, ONENAND_DATARAM,
1686                                 this->page_buf, 0, mtd->writesize);
1687                 }
1688
1689                 this->command(mtd, oobcmd, to, mtd->oobsize);
1690
1691                 onenand_update_bufferram(mtd, to, 0);
1692                 if (ONENAND_IS_2PLANE(this)) {
1693                         ONENAND_SET_BUFFERRAM1(this);
1694                         onenand_update_bufferram(mtd, to + this->writesize, 0);
1695                 }
1696
1697                 ret = this->wait(mtd, FL_WRITING);
1698                 if (ret) {
1699                         printk(KERN_ERR "onenand_write_oob_nolock: write failed %d\n", ret);
1700                         break;
1701                 }
1702
1703                 ret = onenand_verify_oob(mtd, oobbuf, to);
1704                 if (ret) {
1705                         printk(KERN_ERR "onenand_write_oob_nolock: verify failed %d\n", ret);
1706                         break;
1707                 }
1708
1709                 written += thislen;
1710                 if (written == len)
1711                         break;
1712
1713                 to += mtd->writesize;
1714                 buf += thislen;
1715                 column = 0;
1716         }
1717
1718         ops->oobretlen = written;
1719
1720         return ret;
1721 }
1722
1723 /**
1724  * onenand_write - [MTD Interface] compability function for onenand_write_ecc
1725  * @param mtd           MTD device structure
1726  * @param to            offset to write to
1727  * @param len           number of bytes to write
1728  * @param retlen        pointer to variable to store the number of written bytes
1729  * @param buf           the data to write
1730  *
1731  * Write with ECC
1732  */
1733 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
1734                   size_t * retlen, const u_char * buf)
1735 {
1736         struct mtd_oob_ops ops = {
1737                 .len    = len,
1738                 .ooblen = 0,
1739                 .datbuf = (u_char *) buf,
1740                 .oobbuf = NULL,
1741                 .mode   = MTD_OOB_AUTO,
1742         };
1743         int ret;
1744
1745         onenand_get_device(mtd, FL_WRITING);
1746         ret = onenand_write_ops_nolock(mtd, to, &ops);
1747         onenand_release_device(mtd);
1748
1749         *retlen = ops.retlen;
1750         return ret;
1751 }
1752
1753 /**
1754  * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
1755  * @param mtd           MTD device structure
1756  * @param to            offset to write to
1757  * @param ops           oob operation description structure
1758  *
1759  * OneNAND write main and/or out-of-band
1760  */
1761 int onenand_write_oob(struct mtd_info *mtd, loff_t to,
1762                         struct mtd_oob_ops *ops)
1763 {
1764         int ret;
1765
1766         switch (ops->mode) {
1767         case MTD_OOB_PLACE:
1768         case MTD_OOB_AUTO:
1769                 break;
1770         case MTD_OOB_RAW:
1771                 /* Not implemented yet */
1772         default:
1773                 return -EINVAL;
1774         }
1775
1776         onenand_get_device(mtd, FL_WRITING);
1777         if (ops->datbuf)
1778                 ret = onenand_write_ops_nolock(mtd, to, ops);
1779         else
1780                 ret = onenand_write_oob_nolock(mtd, to, ops);
1781         onenand_release_device(mtd);
1782
1783         return ret;
1784
1785 }
1786
1787 /**
1788  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
1789  * @param mtd           MTD device structure
1790  * @param ofs           offset from device start
1791  * @param allowbbt      1, if its allowed to access the bbt area
1792  *
1793  * Check, if the block is bad, Either by reading the bad block table or
1794  * calling of the scan function.
1795  */
1796 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
1797 {
1798         struct onenand_chip *this = mtd->priv;
1799         struct bbm_info *bbm = this->bbm;
1800
1801         /* Return info from the table */
1802         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1803 }
1804
1805
1806 /**
1807  * onenand_erase - [MTD Interface] erase block(s)
1808  * @param mtd           MTD device structure
1809  * @param instr         erase instruction
1810  *
1811  * Erase one ore more blocks
1812  */
1813 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1814 {
1815         struct onenand_chip *this = mtd->priv;
1816         unsigned int block_size;
1817         loff_t addr = instr->addr;
1818         unsigned int len = instr->len;
1819         int ret = 0, i;
1820         struct mtd_erase_region_info *region = NULL;
1821         unsigned int region_end = 0;
1822
1823         MTDDEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n",
1824                         (unsigned int) addr, len);
1825
1826         /* Do not allow erase past end of device */
1827         if (unlikely((len + addr) > mtd->size)) {
1828                 MTDDEBUG(MTD_DEBUG_LEVEL0, "onenand_erase:"
1829                                         "Erase past end of device\n");
1830                 return -EINVAL;
1831         }
1832
1833         if (FLEXONENAND(this)) {
1834                 /* Find the eraseregion of this address */
1835                 i = flexonenand_region(mtd, addr);
1836                 region = &mtd->eraseregions[i];
1837
1838                 block_size = region->erasesize;
1839                 region_end = region->offset
1840                         + region->erasesize * region->numblocks;
1841
1842                 /* Start address within region must align on block boundary.
1843                  * Erase region's start offset is always block start address.
1844                  */
1845                 if (unlikely((addr - region->offset) & (block_size - 1))) {
1846                         MTDDEBUG(MTD_DEBUG_LEVEL0, "onenand_erase:"
1847                                 " Unaligned address\n");
1848                         return -EINVAL;
1849                 }
1850         } else {
1851                 block_size = 1 << this->erase_shift;
1852
1853                 /* Start address must align on block boundary */
1854                 if (unlikely(addr & (block_size - 1))) {
1855                         MTDDEBUG(MTD_DEBUG_LEVEL0, "onenand_erase:"
1856                                                 "Unaligned address\n");
1857                         return -EINVAL;
1858                 }
1859         }
1860
1861         /* Length must align on block boundary */
1862         if (unlikely(len & (block_size - 1))) {
1863                 MTDDEBUG (MTD_DEBUG_LEVEL0,
1864                          "onenand_erase: Length not block aligned\n");
1865                 return -EINVAL;
1866         }
1867
1868         instr->fail_addr = 0xffffffff;
1869
1870         /* Grab the lock and see if the device is available */
1871         onenand_get_device(mtd, FL_ERASING);
1872
1873         /* Loop throught the pages */
1874         instr->state = MTD_ERASING;
1875
1876         while (len) {
1877
1878                 /* Check if we have a bad block, we do not erase bad blocks */
1879                 if (instr->priv == 0 && onenand_block_isbad_nolock(mtd, addr, 0)) {
1880                         printk(KERN_WARNING "onenand_erase: attempt to erase"
1881                                 " a bad block at addr 0x%08x\n",
1882                                 (unsigned int) addr);
1883                         instr->state = MTD_ERASE_FAILED;
1884                         goto erase_exit;
1885                 }
1886
1887                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1888
1889                 onenand_invalidate_bufferram(mtd, addr, block_size);
1890
1891                 ret = this->wait(mtd, FL_ERASING);
1892                 /* Check, if it is write protected */
1893                 if (ret) {
1894                         if (ret == -EPERM)
1895                                 MTDDEBUG (MTD_DEBUG_LEVEL0, "onenand_erase: "
1896                                           "Device is write protected!!!\n");
1897                         else
1898                                 MTDDEBUG (MTD_DEBUG_LEVEL0, "onenand_erase: "
1899                                           "Failed erase, block %d\n",
1900                                         onenand_block(this, addr));
1901                         instr->state = MTD_ERASE_FAILED;
1902                         instr->fail_addr = addr;
1903                 }
1904
1905                 len -= block_size;
1906                 addr += block_size;
1907
1908                 if (addr == region_end) {
1909                         if (!len)
1910                                 break;
1911                         region++;
1912
1913                         block_size = region->erasesize;
1914                         region_end = region->offset
1915                                 + region->erasesize * region->numblocks;
1916
1917                         if (len & (block_size - 1)) {
1918                                 /* This has been checked at MTD
1919                                  * partitioning level. */
1920                                 printk("onenand_erase: Unaligned address\n");
1921                                 goto erase_exit;
1922                         }
1923                 }
1924         }
1925
1926         instr->state = MTD_ERASE_DONE;
1927
1928 erase_exit:
1929
1930         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1931         /* Do call back function */
1932         if (!ret)
1933                 mtd_erase_callback(instr);
1934
1935         /* Deselect and wake up anyone waiting on the device */
1936         onenand_release_device(mtd);
1937
1938         return ret;
1939 }
1940
1941 /**
1942  * onenand_sync - [MTD Interface] sync
1943  * @param mtd           MTD device structure
1944  *
1945  * Sync is actually a wait for chip ready function
1946  */
1947 static void onenand_sync(struct mtd_info *mtd)
1948 {
1949         MTDDEBUG (MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1950
1951         /* Grab the lock and see if the device is available */
1952         onenand_get_device(mtd, FL_SYNCING);
1953
1954         /* Release it and go back */
1955         onenand_release_device(mtd);
1956 }
1957
1958 /**
1959  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1960  * @param mtd           MTD device structure
1961  * @param ofs           offset relative to mtd start
1962  *
1963  * Check whether the block is bad
1964  */
1965 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1966 {
1967         int ret;
1968
1969         /* Check for invalid offset */
1970         if (ofs > mtd->size)
1971                 return -EINVAL;
1972
1973         onenand_get_device(mtd, FL_READING);
1974         ret = onenand_block_isbad_nolock(mtd, ofs, 0);
1975         onenand_release_device(mtd);
1976         return ret;
1977 }
1978
1979 /**
1980  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1981  * @param mtd           MTD device structure
1982  * @param ofs           offset from device start
1983  *
1984  * This is the default implementation, which can be overridden by
1985  * a hardware specific driver.
1986  */
1987 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1988 {
1989         struct onenand_chip *this = mtd->priv;
1990         struct bbm_info *bbm = this->bbm;
1991         u_char buf[2] = {0, 0};
1992         struct mtd_oob_ops ops = {
1993                 .mode = MTD_OOB_PLACE,
1994                 .ooblen = 2,
1995                 .oobbuf = buf,
1996                 .ooboffs = 0,
1997         };
1998         int block;
1999
2000         /* Get block number */
2001         block = onenand_block(this, ofs);
2002         if (bbm->bbt)
2003                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
2004
2005         /* We write two bytes, so we dont have to mess with 16 bit access */
2006         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
2007         return onenand_write_oob_nolock(mtd, ofs, &ops);
2008 }
2009
2010 /**
2011  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
2012  * @param mtd           MTD device structure
2013  * @param ofs           offset relative to mtd start
2014  *
2015  * Mark the block as bad
2016  */
2017 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
2018 {
2019         struct onenand_chip *this = mtd->priv;
2020         int ret;
2021
2022         ret = onenand_block_isbad(mtd, ofs);
2023         if (ret) {
2024                 /* If it was bad already, return success and do nothing */
2025                 if (ret > 0)
2026                         return 0;
2027                 return ret;
2028         }
2029
2030         ret = this->block_markbad(mtd, ofs);
2031         return ret;
2032 }
2033
2034 /**
2035  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
2036  * @param mtd           MTD device structure
2037  * @param ofs           offset relative to mtd start
2038  * @param len           number of bytes to lock or unlock
2039  * @param cmd           lock or unlock command
2040  *
2041  * Lock or unlock one or more blocks
2042  */
2043 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
2044 {
2045         struct onenand_chip *this = mtd->priv;
2046         int start, end, block, value, status;
2047         int wp_status_mask;
2048
2049         start = onenand_block(this, ofs);
2050         end = onenand_block(this, ofs + len);
2051
2052         if (cmd == ONENAND_CMD_LOCK)
2053                 wp_status_mask = ONENAND_WP_LS;
2054         else
2055                 wp_status_mask = ONENAND_WP_US;
2056
2057         /* Continuous lock scheme */
2058         if (this->options & ONENAND_HAS_CONT_LOCK) {
2059                 /* Set start block address */
2060                 this->write_word(start,
2061                                  this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2062                 /* Set end block address */
2063                 this->write_word(end - 1,
2064                                  this->base + ONENAND_REG_END_BLOCK_ADDRESS);
2065                 /* Write unlock command */
2066                 this->command(mtd, cmd, 0, 0);
2067
2068                 /* There's no return value */
2069                 this->wait(mtd, FL_UNLOCKING);
2070
2071                 /* Sanity check */
2072                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2073                        & ONENAND_CTRL_ONGO)
2074                         continue;
2075
2076                 /* Check lock status */
2077                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2078                 if (!(status & ONENAND_WP_US))
2079                         printk(KERN_ERR "wp status = 0x%x\n", status);
2080
2081                 return 0;
2082         }
2083
2084         /* Block lock scheme */
2085         for (block = start; block < end; block++) {
2086                 /* Set block address */
2087                 value = onenand_block_address(this, block);
2088                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2089                 /* Select DataRAM for DDP */
2090                 value = onenand_bufferram_address(this, block);
2091                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2092
2093                 /* Set start block address */
2094                 this->write_word(block,
2095                                  this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2096                 /* Write unlock command */
2097                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
2098
2099                 /* There's no return value */
2100                 this->wait(mtd, FL_UNLOCKING);
2101
2102                 /* Sanity check */
2103                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2104                        & ONENAND_CTRL_ONGO)
2105                         continue;
2106
2107                 /* Check lock status */
2108                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2109                 if (!(status & ONENAND_WP_US))
2110                         printk(KERN_ERR "block = %d, wp status = 0x%x\n",
2111                                block, status);
2112         }
2113
2114         return 0;
2115 }
2116
2117 #ifdef ONENAND_LINUX
2118 /**
2119  * onenand_lock - [MTD Interface] Lock block(s)
2120  * @param mtd           MTD device structure
2121  * @param ofs           offset relative to mtd start
2122  * @param len           number of bytes to unlock
2123  *
2124  * Lock one or more blocks
2125  */
2126 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
2127 {
2128         int ret;
2129
2130         onenand_get_device(mtd, FL_LOCKING);
2131         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
2132         onenand_release_device(mtd);
2133         return ret;
2134 }
2135
2136 /**
2137  * onenand_unlock - [MTD Interface] Unlock block(s)
2138  * @param mtd           MTD device structure
2139  * @param ofs           offset relative to mtd start
2140  * @param len           number of bytes to unlock
2141  *
2142  * Unlock one or more blocks
2143  */
2144 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
2145 {
2146         int ret;
2147
2148         onenand_get_device(mtd, FL_LOCKING);
2149         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2150         onenand_release_device(mtd);
2151         return ret;
2152 }
2153 #endif
2154
2155 /**
2156  * onenand_check_lock_status - [OneNAND Interface] Check lock status
2157  * @param this          onenand chip data structure
2158  *
2159  * Check lock status
2160  */
2161 static int onenand_check_lock_status(struct onenand_chip *this)
2162 {
2163         unsigned int value, block, status;
2164         unsigned int end;
2165
2166         end = this->chipsize >> this->erase_shift;
2167         for (block = 0; block < end; block++) {
2168                 /* Set block address */
2169                 value = onenand_block_address(this, block);
2170                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2171                 /* Select DataRAM for DDP */
2172                 value = onenand_bufferram_address(this, block);
2173                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2174                 /* Set start block address */
2175                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2176
2177                 /* Check lock status */
2178                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2179                 if (!(status & ONENAND_WP_US)) {
2180                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
2181                         return 0;
2182                 }
2183         }
2184
2185         return 1;
2186 }
2187
2188 /**
2189  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
2190  * @param mtd           MTD device structure
2191  *
2192  * Unlock all blocks
2193  */
2194 static void onenand_unlock_all(struct mtd_info *mtd)
2195 {
2196         struct onenand_chip *this = mtd->priv;
2197         loff_t ofs = 0;
2198         size_t len = mtd->size;
2199
2200         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
2201                 /* Set start block address */
2202                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2203                 /* Write unlock command */
2204                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
2205
2206                 /* There's no return value */
2207                 this->wait(mtd, FL_LOCKING);
2208
2209                 /* Sanity check */
2210                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2211                                 & ONENAND_CTRL_ONGO)
2212                         continue;
2213
2214                 /* Check lock status */
2215                 if (onenand_check_lock_status(this))
2216                         return;
2217
2218                 /* Workaround for all block unlock in DDP */
2219                 if (ONENAND_IS_DDP(this) && !FLEXONENAND(this)) {
2220                         /* All blocks on another chip */
2221                         ofs = this->chipsize >> 1;
2222                         len = this->chipsize >> 1;
2223                 }
2224         }
2225
2226         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2227 }
2228
2229
2230 /**
2231  * onenand_check_features - Check and set OneNAND features
2232  * @param mtd           MTD data structure
2233  *
2234  * Check and set OneNAND features
2235  * - lock scheme
2236  * - two plane
2237  */
2238 static void onenand_check_features(struct mtd_info *mtd)
2239 {
2240         struct onenand_chip *this = mtd->priv;
2241         unsigned int density, process;
2242         unsigned int syscfg;
2243
2244         /* Lock scheme depends on density and process */
2245         density = onenand_get_density(this->device_id);
2246         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
2247
2248         /* Lock scheme */
2249         switch (density) {
2250         case ONENAND_DEVICE_DENSITY_4Gb:
2251                 if (ONENAND_IS_DDP(this))
2252                         this->options |= ONENAND_HAS_2PLANE;
2253                 else
2254                         this->options |= ONENAND_HAS_4KB_PAGE;
2255
2256         case ONENAND_DEVICE_DENSITY_2Gb:
2257                 /* 2Gb DDP don't have 2 plane */
2258                 if (!ONENAND_IS_DDP(this))
2259                         this->options |= ONENAND_HAS_2PLANE;
2260                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2261
2262         case ONENAND_DEVICE_DENSITY_1Gb:
2263                 /* A-Die has all block unlock */
2264                 if (process)
2265                         this->options |= ONENAND_HAS_UNLOCK_ALL;
2266                 break;
2267
2268         default:
2269                 /* Some OneNAND has continuous lock scheme */
2270                 if (!process)
2271                         this->options |= ONENAND_HAS_CONT_LOCK;
2272                 break;
2273         }
2274
2275         if (ONENAND_IS_4KB_PAGE(this))
2276                 this->options &= ~ONENAND_HAS_2PLANE;
2277
2278         if (FLEXONENAND(this)) {
2279                 this->options &= ~ONENAND_HAS_CONT_LOCK;
2280                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2281         }
2282
2283         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2284         if (syscfg & ONENAND_SYS_CFG1_SYNC_READ) {
2285                 printk(KERN_DEBUG "Sync Burst Mode\n");
2286                 this->options |= ONENAND_SYNC_MODE;
2287         }
2288
2289         if (this->options & ONENAND_HAS_CONT_LOCK)
2290                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
2291         if (this->options & ONENAND_HAS_UNLOCK_ALL)
2292                 printk(KERN_DEBUG "Chip support all block unlock\n");
2293 #ifdef ONENAND_LINUX
2294         if (this->options & ONENAND_HAS_2PLANE)
2295                 printk(KERN_DEBUG "Chip has 2 plane\n");
2296 #endif
2297         if (this->options & ONENAND_HAS_4KB_PAGE)
2298                 printk(KERN_DEBUG "Chip has 4KiB pagesize\n");
2299 }
2300
2301 /**
2302  * onenand_print_device_info - Print device ID
2303  * @param device        device ID
2304  *
2305  * Print device ID
2306  */
2307 char *onenand_print_device_info(int device, int version)
2308 {
2309         int vcc, demuxed, ddp, density, flexonenand;
2310         char *dev_info = malloc(80);
2311 #if 0
2312         char *p = dev_info;
2313 #endif
2314
2315         vcc = device & ONENAND_DEVICE_VCC_MASK;
2316         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
2317         ddp = device & ONENAND_DEVICE_IS_DDP;
2318         density = onenand_get_density(device);
2319         flexonenand = device & DEVICE_IS_FLEXONENAND;
2320 #if 0
2321         p += sprintf(dev_info, "%s%sOneNAND%s %dMB %sV 16-bit (0x%02x)",
2322                demuxed ? "" : "Muxed ",
2323                flexonenand ? "Flex-" : "",
2324                ddp ? "(DDP)" : "",
2325                (16 << density), vcc ? "2.65/3.3" : "1.8", device);
2326
2327         sprintf(p, "\nOneNAND version = 0x%04x", version);
2328         printk("%s\n", dev_info);
2329 #endif
2330
2331         return dev_info;
2332 }
2333
2334 static const struct onenand_manufacturers onenand_manuf_ids[] = {
2335         {ONENAND_MFR_SAMSUNG, "Samsung"},
2336 };
2337
2338 /**
2339  * onenand_check_maf - Check manufacturer ID
2340  * @param manuf         manufacturer ID
2341  *
2342  * Check manufacturer ID
2343  */
2344 static int onenand_check_maf(int manuf)
2345 {
2346         int size = ARRAY_SIZE(onenand_manuf_ids);
2347         char *name;
2348         int i;
2349
2350         for (i = 0; i < size; i++)
2351                 if (manuf == onenand_manuf_ids[i].id)
2352                         break;
2353
2354         if (i < size)
2355                 name = onenand_manuf_ids[i].name;
2356         else
2357                 name = "Unknown";
2358
2359 #ifdef ONENAND_DEBUG
2360         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
2361 #endif
2362
2363         return i == size;
2364 }
2365
2366 /**
2367 * flexonenand_get_boundary      - Reads the SLC boundary
2368 * @param onenand_info           - onenand info structure
2369 *
2370 * Fill up boundary[] field in onenand_chip
2371 **/
2372 static int flexonenand_get_boundary(struct mtd_info *mtd)
2373 {
2374         struct onenand_chip *this = mtd->priv;
2375         unsigned int die, bdry;
2376         int ret, syscfg, locked;
2377
2378         /* Disable ECC */
2379         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2380         this->write_word((syscfg | 0x0100), this->base + ONENAND_REG_SYS_CFG1);
2381
2382         for (die = 0; die < this->dies; die++) {
2383                 this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
2384                 this->wait(mtd, FL_SYNCING);
2385
2386                 this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
2387                 ret = this->wait(mtd, FL_READING);
2388
2389                 bdry = this->read_word(this->base + ONENAND_DATARAM);
2390                 if ((bdry >> FLEXONENAND_PI_UNLOCK_SHIFT) == 3)
2391                         locked = 0;
2392                 else
2393                         locked = 1;
2394                 this->boundary[die] = bdry & FLEXONENAND_PI_MASK;
2395
2396                 this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2397                 ret = this->wait(mtd, FL_RESETING);
2398
2399                 printk(KERN_INFO "Die %d boundary: %d%s\n", die,
2400                        this->boundary[die], locked ? "(Locked)" : "(Unlocked)");
2401         }
2402
2403         /* Enable ECC */
2404         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2405         return 0;
2406 }
2407
2408 /**
2409  * flexonenand_get_size - Fill up fields in onenand_chip and mtd_info
2410  *                        boundary[], diesize[], mtd->size, mtd->erasesize,
2411  *                        mtd->eraseregions
2412  * @param mtd           - MTD device structure
2413  */
2414 static void flexonenand_get_size(struct mtd_info *mtd)
2415 {
2416         struct onenand_chip *this = mtd->priv;
2417         int die, i, eraseshift, density;
2418         int blksperdie, maxbdry;
2419         loff_t ofs;
2420
2421         density = onenand_get_density(this->device_id);
2422         blksperdie = ((loff_t)(16 << density) << 20) >> (this->erase_shift);
2423         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
2424         maxbdry = blksperdie - 1;
2425         eraseshift = this->erase_shift - 1;
2426
2427         mtd->numeraseregions = this->dies << 1;
2428
2429         /* This fills up the device boundary */
2430         flexonenand_get_boundary(mtd);
2431         die = 0;
2432         ofs = 0;
2433         i = -1;
2434         for (; die < this->dies; die++) {
2435                 if (!die || this->boundary[die-1] != maxbdry) {
2436                         i++;
2437                         mtd->eraseregions[i].offset = ofs;
2438                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
2439                         mtd->eraseregions[i].numblocks =
2440                                                         this->boundary[die] + 1;
2441                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
2442                         eraseshift++;
2443                 } else {
2444                         mtd->numeraseregions -= 1;
2445                         mtd->eraseregions[i].numblocks +=
2446                                                         this->boundary[die] + 1;
2447                         ofs += (this->boundary[die] + 1) << (eraseshift - 1);
2448                 }
2449                 if (this->boundary[die] != maxbdry) {
2450                         i++;
2451                         mtd->eraseregions[i].offset = ofs;
2452                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
2453                         mtd->eraseregions[i].numblocks = maxbdry ^
2454                                                          this->boundary[die];
2455                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
2456                         eraseshift--;
2457                 } else
2458                         mtd->numeraseregions -= 1;
2459         }
2460
2461         /* Expose MLC erase size except when all blocks are SLC */
2462         mtd->erasesize = 1 << this->erase_shift;
2463         if (mtd->numeraseregions == 1)
2464                 mtd->erasesize >>= 1;
2465
2466         printk(KERN_INFO "Device has %d eraseregions\n", mtd->numeraseregions);
2467         for (i = 0; i < mtd->numeraseregions; i++)
2468                 printk(KERN_INFO "[offset: 0x%08llx, erasesize: 0x%05x,"
2469                         " numblocks: %04u]\n", mtd->eraseregions[i].offset,
2470                         mtd->eraseregions[i].erasesize,
2471                         mtd->eraseregions[i].numblocks);
2472
2473         for (die = 0, mtd->size = 0; die < this->dies; die++) {
2474                 this->diesize[die] = (loff_t) (blksperdie << this->erase_shift);
2475                 this->diesize[die] -= (loff_t) (this->boundary[die] + 1)
2476                                                  << (this->erase_shift - 1);
2477                 mtd->size += this->diesize[die];
2478         }
2479 }
2480
2481 /**
2482  * flexonenand_check_blocks_erased - Check if blocks are erased
2483  * @param mtd_info      - mtd info structure
2484  * @param start         - first erase block to check
2485  * @param end           - last erase block to check
2486  *
2487  * Converting an unerased block from MLC to SLC
2488  * causes byte values to change. Since both data and its ECC
2489  * have changed, reads on the block give uncorrectable error.
2490  * This might lead to the block being detected as bad.
2491  *
2492  * Avoid this by ensuring that the block to be converted is
2493  * erased.
2494  */
2495 static int flexonenand_check_blocks_erased(struct mtd_info *mtd,
2496                                         int start, int end)
2497 {
2498         struct onenand_chip *this = mtd->priv;
2499         int i, ret;
2500         int block;
2501         struct mtd_oob_ops ops = {
2502                 .mode = MTD_OOB_PLACE,
2503                 .ooboffs = 0,
2504                 .ooblen = mtd->oobsize,
2505                 .datbuf = NULL,
2506                 .oobbuf = this->oob_buf,
2507         };
2508         loff_t addr;
2509
2510         printk(KERN_DEBUG "Check blocks from %d to %d\n", start, end);
2511
2512         for (block = start; block <= end; block++) {
2513                 addr = flexonenand_addr(this, block);
2514                 if (onenand_block_isbad_nolock(mtd, addr, 0))
2515                         continue;
2516
2517                 /*
2518                  * Since main area write results in ECC write to spare,
2519                  * it is sufficient to check only ECC bytes for change.
2520                  */
2521                 ret = onenand_read_oob_nolock(mtd, addr, &ops);
2522                 if (ret)
2523                         return ret;
2524
2525                 for (i = 0; i < mtd->oobsize; i++)
2526                         if (this->oob_buf[i] != 0xff)
2527                                 break;
2528
2529                 if (i != mtd->oobsize) {
2530                         printk(KERN_WARNING "Block %d not erased.\n", block);
2531                         return 1;
2532                 }
2533         }
2534
2535         return 0;
2536 }
2537
2538 /**
2539  * flexonenand_set_boundary     - Writes the SLC boundary
2540  * @param mtd                   - mtd info structure
2541  */
2542 int flexonenand_set_boundary(struct mtd_info *mtd, int die,
2543                                     int boundary, int lock)
2544 {
2545         struct onenand_chip *this = mtd->priv;
2546         int ret, density, blksperdie, old, new, thisboundary;
2547         loff_t addr;
2548
2549         if (die >= this->dies)
2550                 return -EINVAL;
2551
2552         if (boundary == this->boundary[die])
2553                 return 0;
2554
2555         density = onenand_get_density(this->device_id);
2556         blksperdie = ((16 << density) << 20) >> this->erase_shift;
2557         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
2558
2559         if (boundary >= blksperdie) {
2560                 printk("flexonenand_set_boundary:"
2561                         "Invalid boundary value. "
2562                         "Boundary not changed.\n");
2563                 return -EINVAL;
2564         }
2565
2566         /* Check if converting blocks are erased */
2567         old = this->boundary[die] + (die * this->density_mask);
2568         new = boundary + (die * this->density_mask);
2569         ret = flexonenand_check_blocks_erased(mtd, min(old, new)
2570                                                 + 1, max(old, new));
2571         if (ret) {
2572                 printk(KERN_ERR "flexonenand_set_boundary: Please erase blocks before boundary change\n");
2573                 return ret;
2574         }
2575
2576         this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
2577         this->wait(mtd, FL_SYNCING);
2578
2579         /* Check is boundary is locked */
2580         this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
2581         ret = this->wait(mtd, FL_READING);
2582
2583         thisboundary = this->read_word(this->base + ONENAND_DATARAM);
2584         if ((thisboundary >> FLEXONENAND_PI_UNLOCK_SHIFT) != 3) {
2585                 printk(KERN_ERR "flexonenand_set_boundary: boundary locked\n");
2586                 goto out;
2587         }
2588
2589         printk(KERN_INFO "flexonenand_set_boundary: Changing die %d boundary: %d%s\n",
2590                         die, boundary, lock ? "(Locked)" : "(Unlocked)");
2591
2592         boundary &= FLEXONENAND_PI_MASK;
2593         boundary |= lock ? 0 : (3 << FLEXONENAND_PI_UNLOCK_SHIFT);
2594
2595         addr = die ? this->diesize[0] : 0;
2596         this->command(mtd, ONENAND_CMD_ERASE, addr, 0);
2597         ret = this->wait(mtd, FL_ERASING);
2598         if (ret) {
2599                 printk("flexonenand_set_boundary:"
2600                         "Failed PI erase for Die %d\n", die);
2601                 goto out;
2602         }
2603
2604         this->write_word(boundary, this->base + ONENAND_DATARAM);
2605         this->command(mtd, ONENAND_CMD_PROG, addr, 0);
2606         ret = this->wait(mtd, FL_WRITING);
2607         if (ret) {
2608                 printk("flexonenand_set_boundary:"
2609                         "Failed PI write for Die %d\n", die);
2610                 goto out;
2611         }
2612
2613         this->command(mtd, FLEXONENAND_CMD_PI_UPDATE, die, 0);
2614         ret = this->wait(mtd, FL_WRITING);
2615 out:
2616         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_REG_COMMAND);
2617         this->wait(mtd, FL_RESETING);
2618         if (!ret)
2619                 /* Recalculate device size on boundary change*/
2620                 flexonenand_get_size(mtd);
2621
2622         return ret;
2623 }
2624
2625 /**
2626  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
2627  * @param mtd           MTD device structure
2628  *
2629  * OneNAND detection method:
2630  *   Compare the the values from command with ones from register
2631  */
2632 static int onenand_probe(struct mtd_info *mtd)
2633 {
2634         struct onenand_chip *this = mtd->priv;
2635         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
2636         int density;
2637         int syscfg;
2638 #if defined(CONFIG_S5PC110) || defined(CONFIG_S5P6442)
2639         int onenand_if_ctrl_cfg;
2640 #endif
2641
2642         /* Save system configuration 1 */
2643         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2644
2645 #if defined(CONFIG_S5PC110) || defined(CONFIG_S5P6442)
2646         if (syscfg & ONENAND_SYS_CFG1_WM) {
2647                 this->write_word(syscfg & ~(ONENAND_SYS_CFG1_WM), this->base + ONENAND_REG_SYS_CFG1);
2648                 onenand_if_ctrl_cfg = readl(0xB0600100);
2649                 writel(onenand_if_ctrl_cfg & ~ONENAND_SYS_CFG1_WM, 0xB0600100);
2650         }
2651 #else
2652         /* Clear Sync. Burst Read mode to read BootRAM */
2653         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);
2654 #endif
2655
2656         /* Send the command for reading device ID from BootRAM */
2657         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
2658
2659         /* Read manufacturer and device IDs from BootRAM */
2660         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
2661         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
2662
2663         /* Reset OneNAND to read default register values */
2664         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
2665
2666         /* Wait reset */
2667         this->wait(mtd, FL_RESETING);
2668
2669         /* Restore system configuration 1 */
2670         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2671
2672 #if defined(CONFIG_S5PC110) || defined(CONFIG_S5P6442)
2673         if (syscfg & ONENAND_SYS_CFG1_WM)
2674                 writel(onenand_if_ctrl_cfg, 0xB0600100);
2675 #endif
2676
2677         /* Check manufacturer ID */
2678         if (onenand_check_maf(bram_maf_id))
2679                 return -ENXIO;
2680
2681         /* Read manufacturer and device IDs from Register */
2682         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
2683         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
2684         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
2685         this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
2686
2687         /* Check OneNAND device */
2688         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
2689                 return -ENXIO;
2690
2691         /* Flash device information */
2692         mtd->name = onenand_print_device_info(dev_id, ver_id);
2693         this->device_id = dev_id;
2694         this->version_id = ver_id;
2695
2696         /* Check OneNAND features */
2697         onenand_check_features(mtd);
2698
2699         density = onenand_get_density(dev_id);
2700         if (FLEXONENAND(this)) {
2701                 this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
2702                 /* Maximum possible erase regions */
2703                 mtd->numeraseregions = this->dies << 1;
2704                 mtd->eraseregions = malloc(sizeof(struct mtd_erase_region_info)
2705                                         * (this->dies << 1));
2706                 if (!mtd->eraseregions)
2707                         return -ENOMEM;
2708         }
2709
2710         /*
2711          * For Flex-OneNAND, chipsize represents maximum possible device size.
2712          * mtd->size represents the actual device size.
2713          */
2714         this->chipsize = (16 << density) << 20;
2715
2716         /* OneNAND page size & block size */
2717         /* The data buffer size is equal to page size */
2718         mtd->writesize =
2719             this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
2720         /* We use the full BufferRAM */
2721         if (ONENAND_IS_4KB_PAGE(this))
2722                 mtd->writesize <<= 1;
2723
2724         mtd->oobsize = mtd->writesize >> 5;
2725         /* Pagers per block is always 64 in OneNAND */
2726         mtd->erasesize = mtd->writesize << 6;
2727         /*
2728          * Flex-OneNAND SLC area has 64 pages per block.
2729          * Flex-OneNAND MLC area has 128 pages per block.
2730          * Expose MLC erase size to find erase_shift and page_mask.
2731          */
2732         if (FLEXONENAND(this))
2733                 mtd->erasesize <<= 1;
2734
2735         this->erase_shift = ffs(mtd->erasesize) - 1;
2736         this->page_shift = ffs(mtd->writesize) - 1;
2737         this->ppb_shift = (this->erase_shift - this->page_shift);
2738         this->page_mask = (mtd->erasesize / mtd->writesize) - 1;
2739         /* Set density mask. it is used for DDP */
2740         if (ONENAND_IS_DDP(this))
2741                 this->density_mask = this->chipsize >> (this->erase_shift + 1);
2742         /* It's real page size */
2743         this->writesize = mtd->writesize;
2744
2745         /* REVIST: Multichip handling */
2746
2747         if (FLEXONENAND(this))
2748                 flexonenand_get_size(mtd);
2749         else
2750                 mtd->size = this->chipsize;
2751
2752         mtd->flags = MTD_CAP_NANDFLASH;
2753         mtd->erase = onenand_erase;
2754         mtd->read = onenand_read;
2755         mtd->write = onenand_write;
2756         mtd->read_oob = onenand_read_oob;
2757         mtd->write_oob = onenand_write_oob;
2758         mtd->sync = onenand_sync;
2759         mtd->block_isbad = onenand_block_isbad;
2760         mtd->block_markbad = onenand_block_markbad;
2761
2762         return 0;
2763 }
2764
2765 /**
2766  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
2767  * @param mtd           MTD device structure
2768  * @param maxchips      Number of chips to scan for
2769  *
2770  * This fills out all the not initialized function pointers
2771  * with the defaults.
2772  * The flash ID is read and the mtd/chip structures are
2773  * filled with the appropriate values.
2774  */
2775
2776 int onenand_scan(struct mtd_info *mtd, int maxchips)
2777 {
2778         int i;
2779         struct onenand_chip *this = mtd->priv;
2780
2781         if (!this->read_word)
2782                 this->read_word = onenand_readw;
2783         if (!this->write_word)
2784                 this->write_word = onenand_writew;
2785
2786         if (!this->command)
2787                 this->command = onenand_command;
2788         if (!this->wait)
2789                 this->wait = onenand_wait;
2790         if (!this->bbt_wait)
2791                 this->bbt_wait = onenand_bbt_wait;
2792         if (!this->unlock_all)
2793                 this->unlock_all = onenand_unlock_all;
2794
2795         if (!this->read_bufferram)
2796                 this->read_bufferram = onenand_read_bufferram;
2797         if (!this->write_bufferram)
2798                 this->write_bufferram = onenand_write_bufferram;
2799
2800         if (!this->block_markbad)
2801                 this->block_markbad = onenand_default_block_markbad;
2802         if (!this->scan_bbt)
2803                 this->scan_bbt = onenand_default_bbt;
2804
2805         if (onenand_probe(mtd))
2806                 return -ENXIO;
2807
2808         /* Allocate buffers, if necessary */
2809         if (!this->page_buf) {
2810                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
2811                 if (!this->page_buf) {
2812                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
2813                         return -ENOMEM;
2814                 }
2815 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
2816                 this->verify_buf = kzalloc(mtd->writesize, GFP_KERNEL);
2817                 if (!this->verify_buf) {
2818                         kfree(this->page_buf);
2819                         return -ENOMEM;
2820                 }
2821 #endif
2822                 this->options |= ONENAND_PAGEBUF_ALLOC;
2823         }
2824         if (!this->oob_buf) {
2825                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
2826                 if (!this->oob_buf) {
2827                         printk(KERN_ERR "onenand_scan: Can't allocate oob_buf\n");
2828                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
2829                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
2830                                 kfree(this->page_buf);
2831                         }
2832                         return -ENOMEM;
2833                 }
2834                 this->options |= ONENAND_OOBBUF_ALLOC;
2835         }
2836
2837         this->state = FL_READY;
2838
2839         /*
2840          * Allow subpage writes up to oobsize.
2841          */
2842         switch (mtd->oobsize) {
2843         case 128:
2844                 this->ecclayout = &onenand_oob_128;
2845                 mtd->subpage_sft = 0;
2846                 break;
2847
2848         case 64:
2849                 this->ecclayout = &onenand_oob_64;
2850                 mtd->subpage_sft = 2;
2851                 break;
2852
2853         case 32:
2854                 this->ecclayout = &onenand_oob_32;
2855                 mtd->subpage_sft = 1;
2856                 break;
2857
2858         default:
2859                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
2860                         mtd->oobsize);
2861                 mtd->subpage_sft = 0;
2862                 /* To prevent kernel oops */
2863                 this->ecclayout = &onenand_oob_32;
2864                 break;
2865         }
2866
2867         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
2868
2869         /*
2870          * The number of bytes available for a client to place data into
2871          * the out of band area
2872          */
2873         this->ecclayout->oobavail = 0;
2874         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
2875             this->ecclayout->oobfree[i].length; i++)
2876                 this->ecclayout->oobavail +=
2877                         this->ecclayout->oobfree[i].length;
2878         mtd->oobavail = this->ecclayout->oobavail;
2879
2880         mtd->ecclayout = this->ecclayout;
2881
2882         /* Unlock whole block */
2883         this->unlock_all(mtd);
2884
2885         return this->scan_bbt(mtd);
2886 }
2887
2888 /**
2889  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
2890  * @param mtd           MTD device structure
2891  */
2892 void onenand_release(struct mtd_info *mtd)
2893 {
2894 }