git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/onenand/onenand_base.c

   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright (C) 2005-2007 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *
   7  *  Credits:
   8  *      Adrian Hunter <ext-adrian.hunter@nokia.com>:
   9  *      auto-placement support, read-while load support, various fixes
  10  *      Copyright (C) Nokia Corporation, 2007
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/sched.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/mtd/onenand.h>
  25 #include <linux/mtd/partitions.h>
  26
  27 #include <asm/io.h>
  28
  29 /**
  30  * onenand_oob_64 - oob info for large (2KB) page
  31  */
  32 static struct nand_ecclayout onenand_oob_64 = {
  33         .eccbytes       = 20,
  34         .eccpos         = {
  35                 8, 9, 10, 11, 12,
  36                 24, 25, 26, 27, 28,
  37                 40, 41, 42, 43, 44,
  38                 56, 57, 58, 59, 60,
  39                 },
  40         .oobfree        = {
  41                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  42                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  43         }
  44 };
  45
  46 /**
  47  * onenand_oob_32 - oob info for middle (1KB) page
  48  */
  49 static struct nand_ecclayout onenand_oob_32 = {
  50         .eccbytes       = 10,
  51         .eccpos         = {
  52                 8, 9, 10, 11, 12,
  53                 24, 25, 26, 27, 28,
  54                 },
  55         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  56 };
  57
  58 static const unsigned char ffchars[] = {
  59         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  60         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  61         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  62         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  63         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  64         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  65         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  66         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
  67 };
  68
  69 /**
  70  * onenand_readw - [OneNAND Interface] Read OneNAND register
  71  * @param addr          address to read
  72  *
  73  * Read OneNAND register
  74  */
  75 static unsigned short onenand_readw(void __iomem *addr)
  76 {
  77         return readw(addr);
  78 }
  79
  80 /**
  81  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
  82  * @param value         value to write
  83  * @param addr          address to write
  84  *
  85  * Write OneNAND register with value
  86  */
  87 static void onenand_writew(unsigned short value, void __iomem *addr)
  88 {
  89         writew(value, addr);
  90 }
  91
  92 /**
  93  * onenand_block_address - [DEFAULT] Get block address
  94  * @param this          onenand chip data structure
  95  * @param block         the block
  96  * @return              translated block address if DDP, otherwise same
  97  *
  98  * Setup Start Address 1 Register (F100h)
  99  */
 100 static int onenand_block_address(struct onenand_chip *this, int block)
 101 {
 102         /* Device Flash Core select, NAND Flash Block Address */
 103         if (block & this->density_mask)
 104                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 105
 106         return block;
 107 }
 108
 109 /**
 110  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 111  * @param this          onenand chip data structure
 112  * @param block         the block
 113  * @return              set DBS value if DDP, otherwise 0
 114  *
 115  * Setup Start Address 2 Register (F101h) for DDP
 116  */
 117 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 118 {
 119         /* Device BufferRAM Select */
 120         if (block & this->density_mask)
 121                 return ONENAND_DDP_CHIP1;
 122
 123         return ONENAND_DDP_CHIP0;
 124 }
 125
 126 /**
 127  * onenand_page_address - [DEFAULT] Get page address
 128  * @param page          the page address
 129  * @param sector        the sector address
 130  * @return              combined page and sector address
 131  *
 132  * Setup Start Address 8 Register (F107h)
 133  */
 134 static int onenand_page_address(int page, int sector)
 135 {
 136         /* Flash Page Address, Flash Sector Address */
 137         int fpa, fsa;
 138
 139         fpa = page & ONENAND_FPA_MASK;
 140         fsa = sector & ONENAND_FSA_MASK;
 141
 142         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 143 }
 144
 145 /**
 146  * onenand_buffer_address - [DEFAULT] Get buffer address
 147  * @param dataram1      DataRAM index
 148  * @param sectors       the sector address
 149  * @param count         the number of sectors
 150  * @return              the start buffer value
 151  *
 152  * Setup Start Buffer Register (F200h)
 153  */
 154 static int onenand_buffer_address(int dataram1, int sectors, int count)
 155 {
 156         int bsa, bsc;
 157
 158         /* BufferRAM Sector Address */
 159         bsa = sectors & ONENAND_BSA_MASK;
 160
 161         if (dataram1)
 162                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 163         else
 164                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 165
 166         /* BufferRAM Sector Count */
 167         bsc = count & ONENAND_BSC_MASK;
 168
 169         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 170 }
 171
 172 /**
 173  * onenand_command - [DEFAULT] Send command to OneNAND device
 174  * @param mtd           MTD device structure
 175  * @param cmd           the command to be sent
 176  * @param addr          offset to read from or write to
 177  * @param len           number of bytes to read or write
 178  *
 179  * Send command to OneNAND device. This function is used for middle/large page
 180  * devices (1KB/2KB Bytes per page)
 181  */
 182 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 183 {
 184         struct onenand_chip *this = mtd->priv;
 185         int value, block, page;
 186
 187         /* Address translation */
 188         switch (cmd) {
 189         case ONENAND_CMD_UNLOCK:
 190         case ONENAND_CMD_LOCK:
 191         case ONENAND_CMD_LOCK_TIGHT:
 192         case ONENAND_CMD_UNLOCK_ALL:
 193                 block = -1;
 194                 page = -1;
 195                 break;
 196
 197         case ONENAND_CMD_ERASE:
 198         case ONENAND_CMD_BUFFERRAM:
 199         case ONENAND_CMD_OTP_ACCESS:
 200                 block = (int) (addr >> this->erase_shift);
 201                 page = -1;
 202                 break;
 203
 204         default:
 205                 block = (int) (addr >> this->erase_shift);
 206                 page = (int) (addr >> this->page_shift);
 207
 208                 if (ONENAND_IS_2PLANE(this)) {
 209                         /* Make the even block number */
 210                         block &= ~1;
 211                         /* Is it the odd plane? */
 212                         if (addr & this->writesize)
 213                                 block++;
 214                         page >>= 1;
 215                 }
 216                 page &= this->page_mask;
 217                 break;
 218         }
 219
 220         /* NOTE: The setting order of the registers is very important! */
 221         if (cmd == ONENAND_CMD_BUFFERRAM) {
 222                 /* Select DataRAM for DDP */
 223                 value = onenand_bufferram_address(this, block);
 224                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 225
 226                 if (ONENAND_IS_2PLANE(this))
 227                         /* It is always BufferRAM0 */
 228                         ONENAND_SET_BUFFERRAM0(this);
 229                 else
 230                         /* Switch to the next data buffer */
 231                         ONENAND_SET_NEXT_BUFFERRAM(this);
 232
 233                 return 0;
 234         }
 235
 236         if (block != -1) {
 237                 /* Write 'DFS, FBA' of Flash */
 238                 value = onenand_block_address(this, block);
 239                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 240
 241                 /* Select DataRAM for DDP */
 242                 value = onenand_bufferram_address(this, block);
 243                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 244         }
 245
 246         if (page != -1) {
 247                 /* Now we use page size operation */
 248                 int sectors = 4, count = 4;
 249                 int dataram;
 250
 251                 switch (cmd) {
 252                 case ONENAND_CMD_READ:
 253                 case ONENAND_CMD_READOOB:
 254                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 255                         break;
 256
 257                 default:
 258                         if (ONENAND_IS_2PLANE(this) && cmd == ONENAND_CMD_PROG)
 259                                 cmd = ONENAND_CMD_2X_PROG;
 260                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 261                         break;
 262                 }
 263
 264                 /* Write 'FPA, FSA' of Flash */
 265                 value = onenand_page_address(page, sectors);
 266                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 267
 268                 /* Write 'BSA, BSC' of DataRAM */
 269                 value = onenand_buffer_address(dataram, sectors, count);
 270                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 271         }
 272
 273         /* Interrupt clear */
 274         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 275
 276         /* Write command */
 277         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 278
 279         return 0;
 280 }
 281
 282 /**
 283  * onenand_wait - [DEFAULT] wait until the command is done
 284  * @param mtd           MTD device structure
 285  * @param state         state to select the max. timeout value
 286  *
 287  * Wait for command done. This applies to all OneNAND command
 288  * Read can take up to 30us, erase up to 2ms and program up to 350us
 289  * according to general OneNAND specs
 290  */
 291 static int onenand_wait(struct mtd_info *mtd, int state)
 292 {
 293         struct onenand_chip * this = mtd->priv;
 294         unsigned long timeout;
 295         unsigned int flags = ONENAND_INT_MASTER;
 296         unsigned int interrupt = 0;
 297         unsigned int ctrl;
 298
 299         /* The 20 msec is enough */
 300         timeout = jiffies + msecs_to_jiffies(20);
 301         while (time_before(jiffies, timeout)) {
 302                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 303
 304                 if (interrupt & flags)
 305                         break;
 306
 307                 if (state != FL_READING)
 308                         cond_resched();
 309         }
 310         /* To get correct interrupt status in timeout case */
 311         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 312
 313         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 314
 315         if (ctrl & ONENAND_CTRL_ERROR) {
 316                 printk(KERN_ERR "onenand_wait: controller error = 0x%04x\n", ctrl);
 317                 if (ctrl & ONENAND_CTRL_LOCK)
 318                         printk(KERN_ERR "onenand_wait: it's locked error.\n");
 319                 return -EIO;
 320         }
 321
 322         if (interrupt & ONENAND_INT_READ) {
 323                 int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 324                 if (ecc) {
 325                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 326                                 printk(KERN_ERR "onenand_wait: ECC error = 0x%04x\n", ecc);
 327                                 mtd->ecc_stats.failed++;
 328                                 return -EBADMSG;
 329                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 330                                 printk(KERN_INFO "onenand_wait: correctable ECC error = 0x%04x\n", ecc);
 331                                 mtd->ecc_stats.corrected++;
 332                         }
 333                 }
 334         } else if (state == FL_READING) {
 335                 printk(KERN_ERR "onenand_wait: read timeout! ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
 336                 return -EIO;
 337         }
 338
 339         return 0;
 340 }
 341
 342 /*
 343  * onenand_interrupt - [DEFAULT] onenand interrupt handler
 344  * @param irq           onenand interrupt number
 345  * @param dev_id        interrupt data
 346  *
 347  * complete the work
 348  */
 349 static irqreturn_t onenand_interrupt(int irq, void *data)
 350 {
 351         struct onenand_chip *this = data;
 352
 353         /* To handle shared interrupt */
 354         if (!this->complete.done)
 355                 complete(&this->complete);
 356
 357         return IRQ_HANDLED;
 358 }
 359
 360 /*
 361  * onenand_interrupt_wait - [DEFAULT] wait until the command is done
 362  * @param mtd           MTD device structure
 363  * @param state         state to select the max. timeout value
 364  *
 365  * Wait for command done.
 366  */
 367 static int onenand_interrupt_wait(struct mtd_info *mtd, int state)
 368 {
 369         struct onenand_chip *this = mtd->priv;
 370
 371         wait_for_completion(&this->complete);
 372
 373         return onenand_wait(mtd, state);
 374 }
 375
 376 /*
 377  * onenand_try_interrupt_wait - [DEFAULT] try interrupt wait
 378  * @param mtd           MTD device structure
 379  * @param state         state to select the max. timeout value
 380  *
 381  * Try interrupt based wait (It is used one-time)
 382  */
 383 static int onenand_try_interrupt_wait(struct mtd_info *mtd, int state)
 384 {
 385         struct onenand_chip *this = mtd->priv;
 386         unsigned long remain, timeout;
 387
 388         /* We use interrupt wait first */
 389         this->wait = onenand_interrupt_wait;
 390
 391         timeout = msecs_to_jiffies(100);
 392         remain = wait_for_completion_timeout(&this->complete, timeout);
 393         if (!remain) {
 394                 printk(KERN_INFO "OneNAND: There's no interrupt. "
 395                                 "We use the normal wait\n");
 396
 397                 /* Release the irq */
 398                 free_irq(this->irq, this);
 399
 400                 this->wait = onenand_wait;
 401         }
 402
 403         return onenand_wait(mtd, state);
 404 }
 405
 406 /*
 407  * onenand_setup_wait - [OneNAND Interface] setup onenand wait method
 408  * @param mtd           MTD device structure
 409  *
 410  * There's two method to wait onenand work
 411  * 1. polling - read interrupt status register
 412  * 2. interrupt - use the kernel interrupt method
 413  */
 414 static void onenand_setup_wait(struct mtd_info *mtd)
 415 {
 416         struct onenand_chip *this = mtd->priv;
 417         int syscfg;
 418
 419         init_completion(&this->complete);
 420
 421         if (this->irq <= 0) {
 422                 this->wait = onenand_wait;
 423                 return;
 424         }
 425
 426         if (request_irq(this->irq, &onenand_interrupt,
 427                                 IRQF_SHARED, "onenand", this)) {
 428                 /* If we can't get irq, use the normal wait */
 429                 this->wait = onenand_wait;
 430                 return;
 431         }
 432
 433         /* Enable interrupt */
 434         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
 435         syscfg |= ONENAND_SYS_CFG1_IOBE;
 436         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
 437
 438         this->wait = onenand_try_interrupt_wait;
 439 }
 440
 441 /**
 442  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 443  * @param mtd           MTD data structure
 444  * @param area          BufferRAM area
 445  * @return              offset given area
 446  *
 447  * Return BufferRAM offset given area
 448  */
 449 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 450 {
 451         struct onenand_chip *this = mtd->priv;
 452
 453         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 454                 /* Note: the 'this->writesize' is a real page size */
 455                 if (area == ONENAND_DATARAM)
 456                         return this->writesize;
 457                 if (area == ONENAND_SPARERAM)
 458                         return mtd->oobsize;
 459         }
 460
 461         return 0;
 462 }
 463
 464 /**
 465  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 466  * @param mtd           MTD data structure
 467  * @param area          BufferRAM area
 468  * @param buffer        the databuffer to put/get data
 469  * @param offset        offset to read from or write to
 470  * @param count         number of bytes to read/write
 471  *
 472  * Read the BufferRAM area
 473  */
 474 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 475                 unsigned char *buffer, int offset, size_t count)
 476 {
 477         struct onenand_chip *this = mtd->priv;
 478         void __iomem *bufferram;
 479
 480         bufferram = this->base + area;
 481
 482         bufferram += onenand_bufferram_offset(mtd, area);
 483
 484         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 485                 unsigned short word;
 486
 487                 /* Align with word(16-bit) size */
 488                 count--;
 489
 490                 /* Read word and save byte */
 491                 word = this->read_word(bufferram + offset + count);
 492                 buffer[count] = (word & 0xff);
 493         }
 494
 495         memcpy(buffer, bufferram + offset, count);
 496
 497         return 0;
 498 }
 499
 500 /**
 501  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 502  * @param mtd           MTD data structure
 503  * @param area          BufferRAM area
 504  * @param buffer        the databuffer to put/get data
 505  * @param offset        offset to read from or write to
 506  * @param count         number of bytes to read/write
 507  *
 508  * Read the BufferRAM area with Sync. Burst Mode
 509  */
 510 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 511                 unsigned char *buffer, int offset, size_t count)
 512 {
 513         struct onenand_chip *this = mtd->priv;
 514         void __iomem *bufferram;
 515
 516         bufferram = this->base + area;
 517
 518         bufferram += onenand_bufferram_offset(mtd, area);
 519
 520         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 521
 522         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 523                 unsigned short word;
 524
 525                 /* Align with word(16-bit) size */
 526                 count--;
 527
 528                 /* Read word and save byte */
 529                 word = this->read_word(bufferram + offset + count);
 530                 buffer[count] = (word & 0xff);
 531         }
 532
 533         memcpy(buffer, bufferram + offset, count);
 534
 535         this->mmcontrol(mtd, 0);
 536
 537         return 0;
 538 }
 539
 540 /**
 541  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 542  * @param mtd           MTD data structure
 543  * @param area          BufferRAM area
 544  * @param buffer        the databuffer to put/get data
 545  * @param offset        offset to read from or write to
 546  * @param count         number of bytes to read/write
 547  *
 548  * Write the BufferRAM area
 549  */
 550 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 551                 const unsigned char *buffer, int offset, size_t count)
 552 {
 553         struct onenand_chip *this = mtd->priv;
 554         void __iomem *bufferram;
 555
 556         bufferram = this->base + area;
 557
 558         bufferram += onenand_bufferram_offset(mtd, area);
 559
 560         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 561                 unsigned short word;
 562                 int byte_offset;
 563
 564                 /* Align with word(16-bit) size */
 565                 count--;
 566
 567                 /* Calculate byte access offset */
 568                 byte_offset = offset + count;
 569
 570                 /* Read word and save byte */
 571                 word = this->read_word(bufferram + byte_offset);
 572                 word = (word & ~0xff) | buffer[count];
 573                 this->write_word(word, bufferram + byte_offset);
 574         }
 575
 576         memcpy(bufferram + offset, buffer, count);
 577
 578         return 0;
 579 }
 580
 581 /**
 582  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 583  * @param mtd           MTD data structure
 584  * @param addr          address to check
 585  * @return              blockpage address
 586  *
 587  * Get blockpage address at 2x program mode
 588  */
 589 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 590 {
 591         struct onenand_chip *this = mtd->priv;
 592         int blockpage, block, page;
 593
 594         /* Calculate the even block number */
 595         block = (int) (addr >> this->erase_shift) & ~1;
 596         /* Is it the odd plane? */
 597         if (addr & this->writesize)
 598                 block++;
 599         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 600         blockpage = (block << 7) | page;
 601
 602         return blockpage;
 603 }
 604
 605 /**
 606  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 607  * @param mtd           MTD data structure
 608  * @param addr          address to check
 609  * @return              1 if there are valid data, otherwise 0
 610  *
 611  * Check bufferram if there is data we required
 612  */
 613 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 614 {
 615         struct onenand_chip *this = mtd->priv;
 616         int blockpage, found = 0;
 617         unsigned int i;
 618
 619         if (ONENAND_IS_2PLANE(this))
 620                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 621         else
 622                 blockpage = (int) (addr >> this->page_shift);
 623
 624         /* Is there valid data? */
 625         i = ONENAND_CURRENT_BUFFERRAM(this);
 626         if (this->bufferram[i].blockpage == blockpage)
 627                 found = 1;
 628         else {
 629                 /* Check another BufferRAM */
 630                 i = ONENAND_NEXT_BUFFERRAM(this);
 631                 if (this->bufferram[i].blockpage == blockpage) {
 632                         ONENAND_SET_NEXT_BUFFERRAM(this);
 633                         found = 1;
 634                 }
 635         }
 636
 637         if (found && ONENAND_IS_DDP(this)) {
 638                 /* Select DataRAM for DDP */
 639                 int block = (int) (addr >> this->erase_shift);
 640                 int value = onenand_bufferram_address(this, block);
 641                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 642         }
 643
 644         return found;
 645 }
 646
 647 /**
 648  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 649  * @param mtd           MTD data structure
 650  * @param addr          address to update
 651  * @param valid         valid flag
 652  *
 653  * Update BufferRAM information
 654  */
 655 static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 656                 int valid)
 657 {
 658         struct onenand_chip *this = mtd->priv;
 659         int blockpage;
 660         unsigned int i;
 661
 662         if (ONENAND_IS_2PLANE(this))
 663                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 664         else
 665                 blockpage = (int) (addr >> this->page_shift);
 666
 667         /* Invalidate another BufferRAM */
 668         i = ONENAND_NEXT_BUFFERRAM(this);
 669         if (this->bufferram[i].blockpage == blockpage)
 670                 this->bufferram[i].blockpage = -1;
 671
 672         /* Update BufferRAM */
 673         i = ONENAND_CURRENT_BUFFERRAM(this);
 674         if (valid)
 675                 this->bufferram[i].blockpage = blockpage;
 676         else
 677                 this->bufferram[i].blockpage = -1;
 678 }
 679
 680 /**
 681  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 682  * @param mtd           MTD data structure
 683  * @param addr          start address to invalidate
 684  * @param len           length to invalidate
 685  *
 686  * Invalidate BufferRAM information
 687  */
 688 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 689                 unsigned int len)
 690 {
 691         struct onenand_chip *this = mtd->priv;
 692         int i;
 693         loff_t end_addr = addr + len;
 694
 695         /* Invalidate BufferRAM */
 696         for (i = 0; i < MAX_BUFFERRAM; i++) {
 697                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 698                 if (buf_addr >= addr && buf_addr < end_addr)
 699                         this->bufferram[i].blockpage = -1;
 700         }
 701 }
 702
 703 /**
 704  * onenand_get_device - [GENERIC] Get chip for selected access
 705  * @param mtd           MTD device structure
 706  * @param new_state     the state which is requested
 707  *
 708  * Get the device and lock it for exclusive access
 709  */
 710 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 711 {
 712         struct onenand_chip *this = mtd->priv;
 713         DECLARE_WAITQUEUE(wait, current);
 714
 715         /*
 716          * Grab the lock and see if the device is available
 717          */
 718         while (1) {
 719                 spin_lock(&this->chip_lock);
 720                 if (this->state == FL_READY) {
 721                         this->state = new_state;
 722                         spin_unlock(&this->chip_lock);
 723                         break;
 724                 }
 725                 if (new_state == FL_PM_SUSPENDED) {
 726                         spin_unlock(&this->chip_lock);
 727                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 728                 }
 729                 set_current_state(TASK_UNINTERRUPTIBLE);
 730                 add_wait_queue(&this->wq, &wait);
 731                 spin_unlock(&this->chip_lock);
 732                 schedule();
 733                 remove_wait_queue(&this->wq, &wait);
 734         }
 735
 736         return 0;
 737 }
 738
 739 /**
 740  * onenand_release_device - [GENERIC] release chip
 741  * @param mtd           MTD device structure
 742  *
 743  * Deselect, release chip lock and wake up anyone waiting on the device
 744  */
 745 static void onenand_release_device(struct mtd_info *mtd)
 746 {
 747         struct onenand_chip *this = mtd->priv;
 748
 749         /* Release the chip */
 750         spin_lock(&this->chip_lock);
 751         this->state = FL_READY;
 752         wake_up(&this->wq);
 753         spin_unlock(&this->chip_lock);
 754 }
 755
 756 /**
 757  * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
 758  * @param mtd           MTD device structure
 759  * @param buf           destination address
 760  * @param column        oob offset to read from
 761  * @param thislen       oob length to read
 762  */
 763 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,
 764                                 int thislen)
 765 {
 766         struct onenand_chip *this = mtd->priv;
 767         struct nand_oobfree *free;
 768         int readcol = column;
 769         int readend = column + thislen;
 770         int lastgap = 0;
 771         unsigned int i;
 772         uint8_t *oob_buf = this->oob_buf;
 773
 774         free = this->ecclayout->oobfree;
 775         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 776                 if (readcol >= lastgap)
 777                         readcol += free->offset - lastgap;
 778                 if (readend >= lastgap)
 779                         readend += free->offset - lastgap;
 780                 lastgap = free->offset + free->length;
 781         }
 782         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 783         free = this->ecclayout->oobfree;
 784         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 785                 int free_end = free->offset + free->length;
 786                 if (free->offset < readend && free_end > readcol) {
 787                         int st = max_t(int,free->offset,readcol);
 788                         int ed = min_t(int,free_end,readend);
 789                         int n = ed - st;
 790                         memcpy(buf, oob_buf + st, n);
 791                         buf += n;
 792                 } else if (column == 0)
 793                         break;
 794         }
 795         return 0;
 796 }
 797
 798 /**
 799  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
 800  * @param mtd           MTD device structure
 801  * @param from          offset to read from
 802  * @param ops:          oob operation description structure
 803  *
 804  * OneNAND read main and/or out-of-band data
 805  */
 806 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 807                                 struct mtd_oob_ops *ops)
 808 {
 809         struct onenand_chip *this = mtd->priv;
 810         struct mtd_ecc_stats stats;
 811         size_t len = ops->len;
 812         size_t ooblen = ops->ooblen;
 813         u_char *buf = ops->datbuf;
 814         u_char *oobbuf = ops->oobbuf;
 815         int read = 0, column, thislen;
 816         int oobread = 0, oobcolumn, thisooblen, oobsize;
 817         int ret = 0, boundary = 0;
 818         int writesize = this->writesize;
 819
 820         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 821
 822         if (ops->mode == MTD_OOB_AUTO)
 823                 oobsize = this->ecclayout->oobavail;
 824         else
 825                 oobsize = mtd->oobsize;
 826
 827         oobcolumn = from & (mtd->oobsize - 1);
 828
 829         /* Do not allow reads past end of device */
 830         if ((from + len) > mtd->size) {
 831                 printk(KERN_ERR "onenand_read_ops_nolock: Attempt read beyond end of device\n");
 832                 ops->retlen = 0;
 833                 ops->oobretlen = 0;
 834                 return -EINVAL;
 835         }
 836
 837         stats = mtd->ecc_stats;
 838
 839         /* Read-while-load method */
 840
 841         /* Do first load to bufferRAM */
 842         if (read < len) {
 843                 if (!onenand_check_bufferram(mtd, from)) {
 844                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 845                         ret = this->wait(mtd, FL_READING);
 846                         onenand_update_bufferram(mtd, from, !ret);
 847                         if (ret == -EBADMSG)
 848                                 ret = 0;
 849                 }
 850         }
 851
 852         thislen = min_t(int, writesize, len - read);
 853         column = from & (writesize - 1);
 854         if (column + thislen > writesize)
 855                 thislen = writesize - column;
 856
 857         while (!ret) {
 858                 /* If there is more to load then start next load */
 859                 from += thislen;
 860                 if (read + thislen < len) {
 861                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 862                         /*
 863                          * Chip boundary handling in DDP
 864                          * Now we issued chip 1 read and pointed chip 1
 865                          * bufferam so we have to point chip 0 bufferam.
 866                          */
 867                         if (ONENAND_IS_DDP(this) &&
 868                             unlikely(from == (this->chipsize >> 1))) {
 869                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
 870                                 boundary = 1;
 871                         } else
 872                                 boundary = 0;
 873                         ONENAND_SET_PREV_BUFFERRAM(this);
 874                 }
 875                 /* While load is going, read from last bufferRAM */
 876                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
 877
 878                 /* Read oob area if needed */
 879                 if (oobbuf) {
 880                         thisooblen = oobsize - oobcolumn;
 881                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
 882
 883                         if (ops->mode == MTD_OOB_AUTO)
 884                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
 885                         else
 886                                 this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
 887                         oobread += thisooblen;
 888                         oobbuf += thisooblen;
 889                         oobcolumn = 0;
 890                 }
 891
 892                 /* See if we are done */
 893                 read += thislen;
 894                 if (read == len)
 895                         break;
 896                 /* Set up for next read from bufferRAM */
 897                 if (unlikely(boundary))
 898                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
 899                 ONENAND_SET_NEXT_BUFFERRAM(this);
 900                 buf += thislen;
 901                 thislen = min_t(int, writesize, len - read);
 902                 column = 0;
 903                 cond_resched();
 904                 /* Now wait for load */
 905                 ret = this->wait(mtd, FL_READING);
 906                 onenand_update_bufferram(mtd, from, !ret);
 907                 if (ret == -EBADMSG)
 908                         ret = 0;
 909         }
 910
 911         /*
 912          * Return success, if no ECC failures, else -EBADMSG
 913          * fs driver will take care of that, because
 914          * retlen == desired len and result == -EBADMSG
 915          */
 916         ops->retlen = read;
 917         ops->oobretlen = oobread;
 918
 919         if (ret)
 920                 return ret;
 921
 922         if (mtd->ecc_stats.failed - stats.failed)
 923                 return -EBADMSG;
 924
 925         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 926 }
 927
 928 /**
 929  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
 930  * @param mtd           MTD device structure
 931  * @param from          offset to read from
 932  * @param ops:          oob operation description structure
 933  *
 934  * OneNAND read out-of-band data from the spare area
 935  */
 936 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 937                         struct mtd_oob_ops *ops)
 938 {
 939         struct onenand_chip *this = mtd->priv;
 940         struct mtd_ecc_stats stats;
 941         int read = 0, thislen, column, oobsize;
 942         size_t len = ops->ooblen;
 943         mtd_oob_mode_t mode = ops->mode;
 944         u_char *buf = ops->oobbuf;
 945         int ret = 0;
 946
 947         from += ops->ooboffs;
 948
 949         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 950
 951         /* Initialize return length value */
 952         ops->oobretlen = 0;
 953
 954         if (mode == MTD_OOB_AUTO)
 955                 oobsize = this->ecclayout->oobavail;
 956         else
 957                 oobsize = mtd->oobsize;
 958
 959         column = from & (mtd->oobsize - 1);
 960
 961         if (unlikely(column >= oobsize)) {
 962                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to start read outside oob\n");
 963                 return -EINVAL;
 964         }
 965
 966         /* Do not allow reads past end of device */
 967         if (unlikely(from >= mtd->size ||
 968                      column + len > ((mtd->size >> this->page_shift) -
 969                                      (from >> this->page_shift)) * oobsize)) {
 970                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to read beyond end of device\n");
 971                 return -EINVAL;
 972         }
 973
 974         stats = mtd->ecc_stats;
 975
 976         while (read < len) {
 977                 cond_resched();
 978
 979                 thislen = oobsize - column;
 980                 thislen = min_t(int, thislen, len);
 981
 982                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 983
 984                 onenand_update_bufferram(mtd, from, 0);
 985
 986                 ret = this->wait(mtd, FL_READING);
 987                 if (ret && ret != -EBADMSG) {
 988                         printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
 989                         break;
 990                 }
 991
 992                 if (mode == MTD_OOB_AUTO)
 993                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
 994                 else
 995                         this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 996
 997                 read += thislen;
 998
 999                 if (read == len)
1000                         break;
1001
1002                 buf += thislen;
1003
1004                 /* Read more? */
1005                 if (read < len) {
1006                         /* Page size */
1007                         from += mtd->writesize;
1008                         column = 0;
1009                 }
1010         }
1011
1012         ops->oobretlen = read;
1013
1014         if (ret)
1015                 return ret;
1016
1017         if (mtd->ecc_stats.failed - stats.failed)
1018                 return -EBADMSG;
1019
1020         return 0;
1021 }
1022
1023 /**
1024  * onenand_read - [MTD Interface] Read data from flash
1025  * @param mtd           MTD device structure
1026  * @param from          offset to read from
1027  * @param len           number of bytes to read
1028  * @param retlen        pointer to variable to store the number of read bytes
1029  * @param buf           the databuffer to put data
1030  *
1031  * Read with ecc
1032 */
1033 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
1034         size_t *retlen, u_char *buf)
1035 {
1036         struct mtd_oob_ops ops = {
1037                 .len    = len,
1038                 .ooblen = 0,
1039                 .datbuf = buf,
1040                 .oobbuf = NULL,
1041         };
1042         int ret;
1043
1044         onenand_get_device(mtd, FL_READING);
1045         ret = onenand_read_ops_nolock(mtd, from, &ops);
1046         onenand_release_device(mtd);
1047
1048         *retlen = ops.retlen;
1049         return ret;
1050 }
1051
1052 /**
1053  * onenand_read_oob - [MTD Interface] Read main and/or out-of-band
1054  * @param mtd:          MTD device structure
1055  * @param from:         offset to read from
1056  * @param ops:          oob operation description structure
1057
1058  * Read main and/or out-of-band
1059  */
1060 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
1061                             struct mtd_oob_ops *ops)
1062 {
1063         int ret;
1064
1065         switch (ops->mode) {
1066         case MTD_OOB_PLACE:
1067         case MTD_OOB_AUTO:
1068                 break;
1069         case MTD_OOB_RAW:
1070                 /* Not implemented yet */
1071         default:
1072                 return -EINVAL;
1073         }
1074
1075         onenand_get_device(mtd, FL_READING);
1076         if (ops->datbuf)
1077                 ret = onenand_read_ops_nolock(mtd, from, ops);
1078         else
1079                 ret = onenand_read_oob_nolock(mtd, from, ops);
1080         onenand_release_device(mtd);
1081
1082         return ret;
1083 }
1084
1085 /**
1086  * onenand_bbt_wait - [DEFAULT] wait until the command is done
1087  * @param mtd           MTD device structure
1088  * @param state         state to select the max. timeout value
1089  *
1090  * Wait for command done.
1091  */
1092 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
1093 {
1094         struct onenand_chip *this = mtd->priv;
1095         unsigned long timeout;
1096         unsigned int interrupt;
1097         unsigned int ctrl;
1098
1099         /* The 20 msec is enough */
1100         timeout = jiffies + msecs_to_jiffies(20);
1101         while (time_before(jiffies, timeout)) {
1102                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1103                 if (interrupt & ONENAND_INT_MASTER)
1104                         break;
1105         }
1106         /* To get correct interrupt status in timeout case */
1107         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1108         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
1109
1110         if (ctrl & ONENAND_CTRL_ERROR) {
1111                 printk(KERN_DEBUG "onenand_bbt_wait: controller error = 0x%04x\n", ctrl);
1112                 /* Initial bad block case */
1113                 if (ctrl & ONENAND_CTRL_LOAD)
1114                         return ONENAND_BBT_READ_ERROR;
1115                 return ONENAND_BBT_READ_FATAL_ERROR;
1116         }
1117
1118         if (interrupt & ONENAND_INT_READ) {
1119                 int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
1120                 if (ecc & ONENAND_ECC_2BIT_ALL)
1121                         return ONENAND_BBT_READ_ERROR;
1122         } else {
1123                 printk(KERN_ERR "onenand_bbt_wait: read timeout!"
1124                         "ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
1125                 return ONENAND_BBT_READ_FATAL_ERROR;
1126         }
1127
1128         return 0;
1129 }
1130
1131 /**
1132  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
1133  * @param mtd           MTD device structure
1134  * @param from          offset to read from
1135  * @param ops           oob operation description structure
1136  *
1137  * OneNAND read out-of-band data from the spare area for bbt scan
1138  */
1139 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
1140                             struct mtd_oob_ops *ops)
1141 {
1142         struct onenand_chip *this = mtd->priv;
1143         int read = 0, thislen, column;
1144         int ret = 0;
1145         size_t len = ops->ooblen;
1146         u_char *buf = ops->oobbuf;
1147
1148         DEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %zi\n", (unsigned int) from, len);
1149
1150         /* Initialize return value */
1151         ops->oobretlen = 0;
1152
1153         /* Do not allow reads past end of device */
1154         if (unlikely((from + len) > mtd->size)) {
1155                 printk(KERN_ERR "onenand_bbt_read_oob: Attempt read beyond end of device\n");
1156                 return ONENAND_BBT_READ_FATAL_ERROR;
1157         }
1158
1159         /* Grab the lock and see if the device is available */
1160         onenand_get_device(mtd, FL_READING);
1161
1162         column = from & (mtd->oobsize - 1);
1163
1164         while (read < len) {
1165                 cond_resched();
1166
1167                 thislen = mtd->oobsize - column;
1168                 thislen = min_t(int, thislen, len);
1169
1170                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
1171
1172                 onenand_update_bufferram(mtd, from, 0);
1173
1174                 ret = onenand_bbt_wait(mtd, FL_READING);
1175                 if (ret)
1176                         break;
1177
1178                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1179                 read += thislen;
1180                 if (read == len)
1181                         break;
1182
1183                 buf += thislen;
1184
1185                 /* Read more? */
1186                 if (read < len) {
1187                         /* Update Page size */
1188                         from += this->writesize;
1189                         column = 0;
1190                 }
1191         }
1192
1193         /* Deselect and wake up anyone waiting on the device */
1194         onenand_release_device(mtd);
1195
1196         ops->oobretlen = read;
1197         return ret;
1198 }
1199
1200 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1201 /**
1202  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1203  * @param mtd           MTD device structure
1204  * @param buf           the databuffer to verify
1205  * @param to            offset to read from
1206  */
1207 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1208 {
1209         struct onenand_chip *this = mtd->priv;
1210         char oobbuf[64];
1211         int status, i;
1212
1213         this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
1214         onenand_update_bufferram(mtd, to, 0);
1215         status = this->wait(mtd, FL_READING);
1216         if (status)
1217                 return status;
1218
1219         this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1220         for (i = 0; i < mtd->oobsize; i++)
1221                 if (buf[i] != 0xFF && buf[i] != oobbuf[i])
1222                         return -EBADMSG;
1223
1224         return 0;
1225 }
1226
1227 /**
1228  * onenand_verify - [GENERIC] verify the chip contents after a write
1229  * @param mtd          MTD device structure
1230  * @param buf          the databuffer to verify
1231  * @param addr         offset to read from
1232  * @param len          number of bytes to read and compare
1233  */
1234 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1235 {
1236         struct onenand_chip *this = mtd->priv;
1237         void __iomem *dataram;
1238         int ret = 0;
1239         int thislen, column;
1240
1241         while (len != 0) {
1242                 thislen = min_t(int, this->writesize, len);
1243                 column = addr & (this->writesize - 1);
1244                 if (column + thislen > this->writesize)
1245                         thislen = this->writesize - column;
1246
1247                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1248
1249                 onenand_update_bufferram(mtd, addr, 0);
1250
1251                 ret = this->wait(mtd, FL_READING);
1252                 if (ret)
1253                         return ret;
1254
1255                 onenand_update_bufferram(mtd, addr, 1);
1256
1257                 dataram = this->base + ONENAND_DATARAM;
1258                 dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
1259
1260                 if (memcmp(buf, dataram + column, thislen))
1261                         return -EBADMSG;
1262
1263                 len -= thislen;
1264                 buf += thislen;
1265                 addr += thislen;
1266         }
1267
1268         return 0;
1269 }
1270 #else
1271 #define onenand_verify(...)             (0)
1272 #define onenand_verify_oob(...)         (0)
1273 #endif
1274
1275 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1276
1277 /**
1278  * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
1279  * @param mtd           MTD device structure
1280  * @param oob_buf       oob buffer
1281  * @param buf           source address
1282  * @param column        oob offset to write to
1283  * @param thislen       oob length to write
1284  */
1285 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1286                                   const u_char *buf, int column, int thislen)
1287 {
1288         struct onenand_chip *this = mtd->priv;
1289         struct nand_oobfree *free;
1290         int writecol = column;
1291         int writeend = column + thislen;
1292         int lastgap = 0;
1293         unsigned int i;
1294
1295         free = this->ecclayout->oobfree;
1296         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1297                 if (writecol >= lastgap)
1298                         writecol += free->offset - lastgap;
1299                 if (writeend >= lastgap)
1300                         writeend += free->offset - lastgap;
1301                 lastgap = free->offset + free->length;
1302         }
1303         free = this->ecclayout->oobfree;
1304         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1305                 int free_end = free->offset + free->length;
1306                 if (free->offset < writeend && free_end > writecol) {
1307                         int st = max_t(int,free->offset,writecol);
1308                         int ed = min_t(int,free_end,writeend);
1309                         int n = ed - st;
1310                         memcpy(oob_buf + st, buf, n);
1311                         buf += n;
1312                 } else if (column == 0)
1313                         break;
1314         }
1315         return 0;
1316 }
1317
1318 /**
1319  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1320  * @param mtd           MTD device structure
1321  * @param to            offset to write to
1322  * @param ops           oob operation description structure
1323  *
1324  * Write main and/or oob with ECC
1325  */
1326 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1327                                 struct mtd_oob_ops *ops)
1328 {
1329         struct onenand_chip *this = mtd->priv;
1330         int written = 0, column, thislen, subpage;
1331         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1332         size_t len = ops->len;
1333         size_t ooblen = ops->ooblen;
1334         const u_char *buf = ops->datbuf;
1335         const u_char *oob = ops->oobbuf;
1336         u_char *oobbuf;
1337         int ret = 0;
1338
1339         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ops_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1340
1341         /* Initialize retlen, in case of early exit */
1342         ops->retlen = 0;
1343         ops->oobretlen = 0;
1344
1345         /* Do not allow writes past end of device */
1346         if (unlikely((to + len) > mtd->size)) {
1347                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt write to past end of device\n");
1348                 return -EINVAL;
1349         }
1350
1351         /* Reject writes, which are not page aligned */
1352         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
1353                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
1354                 return -EINVAL;
1355         }
1356
1357         if (ops->mode == MTD_OOB_AUTO)
1358                 oobsize = this->ecclayout->oobavail;
1359         else
1360                 oobsize = mtd->oobsize;
1361
1362         oobcolumn = to & (mtd->oobsize - 1);
1363
1364         column = to & (mtd->writesize - 1);
1365
1366         /* Loop until all data write */
1367         while (written < len) {
1368                 u_char *wbuf = (u_char *) buf;
1369
1370                 thislen = min_t(int, mtd->writesize - column, len - written);
1371                 thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1372
1373                 cond_resched();
1374
1375                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1376
1377                 /* Partial page write */
1378                 subpage = thislen < mtd->writesize;
1379                 if (subpage) {
1380                         memset(this->page_buf, 0xff, mtd->writesize);
1381                         memcpy(this->page_buf + column, buf, thislen);
1382                         wbuf = this->page_buf;
1383                 }
1384
1385                 this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1386
1387                 if (oob) {
1388                         oobbuf = this->oob_buf;
1389
1390                         /* We send data to spare ram with oobsize
1391                          * to prevent byte access */
1392                         memset(oobbuf, 0xff, mtd->oobsize);
1393                         if (ops->mode == MTD_OOB_AUTO)
1394                                 onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1395                         else
1396                                 memcpy(oobbuf + oobcolumn, oob, thisooblen);
1397
1398                         oobwritten += thisooblen;
1399                         oob += thisooblen;
1400                         oobcolumn = 0;
1401                 } else
1402                         oobbuf = (u_char *) ffchars;
1403
1404                 this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1405
1406                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1407
1408                 ret = this->wait(mtd, FL_WRITING);
1409
1410                 /* In partial page write we don't update bufferram */
1411                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1412                 if (ONENAND_IS_2PLANE(this)) {
1413                         ONENAND_SET_BUFFERRAM1(this);
1414                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1415                 }
1416
1417                 if (ret) {
1418                         printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
1419                         break;
1420                 }
1421
1422                 /* Only check verify write turn on */
1423                 ret = onenand_verify(mtd, buf, to, thislen);
1424                 if (ret) {
1425                         printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
1426                         break;
1427                 }
1428
1429                 written += thislen;
1430
1431                 if (written == len)
1432                         break;
1433
1434                 column = 0;
1435                 to += thislen;
1436                 buf += thislen;
1437         }
1438
1439         ops->retlen = written;
1440
1441         return ret;
1442 }
1443
1444
1445 /**
1446  * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
1447  * @param mtd           MTD device structure
1448  * @param to            offset to write to
1449  * @param len           number of bytes to write
1450  * @param retlen        pointer to variable to store the number of written bytes
1451  * @param buf           the data to write
1452  * @param mode          operation mode
1453  *
1454  * OneNAND write out-of-band
1455  */
1456 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
1457                                     struct mtd_oob_ops *ops)
1458 {
1459         struct onenand_chip *this = mtd->priv;
1460         int column, ret = 0, oobsize;
1461         int written = 0;
1462         u_char *oobbuf;
1463         size_t len = ops->ooblen;
1464         const u_char *buf = ops->oobbuf;
1465         mtd_oob_mode_t mode = ops->mode;
1466
1467         to += ops->ooboffs;
1468
1469         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1470
1471         /* Initialize retlen, in case of early exit */
1472         ops->oobretlen = 0;
1473
1474         if (mode == MTD_OOB_AUTO)
1475                 oobsize = this->ecclayout->oobavail;
1476         else
1477                 oobsize = mtd->oobsize;
1478
1479         column = to & (mtd->oobsize - 1);
1480
1481         if (unlikely(column >= oobsize)) {
1482                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to start write outside oob\n");
1483                 return -EINVAL;
1484         }
1485
1486         /* For compatibility with NAND: Do not allow write past end of page */
1487         if (unlikely(column + len > oobsize)) {
1488                 printk(KERN_ERR "onenand_write_oob_nolock: "
1489                       "Attempt to write past end of page\n");
1490                 return -EINVAL;
1491         }
1492
1493         /* Do not allow reads past end of device */
1494         if (unlikely(to >= mtd->size ||
1495                      column + len > ((mtd->size >> this->page_shift) -
1496                                      (to >> this->page_shift)) * oobsize)) {
1497                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to write past end of device\n");
1498                 return -EINVAL;
1499         }
1500
1501         oobbuf = this->oob_buf;
1502
1503         /* Loop until all data write */
1504         while (written < len) {
1505                 int thislen = min_t(int, oobsize, len - written);
1506
1507                 cond_resched();
1508
1509                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
1510
1511                 /* We send data to spare ram with oobsize
1512                  * to prevent byte access */
1513                 memset(oobbuf, 0xff, mtd->oobsize);
1514                 if (mode == MTD_OOB_AUTO)
1515                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
1516                 else
1517                         memcpy(oobbuf + column, buf, thislen);
1518                 this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1519
1520                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
1521
1522                 onenand_update_bufferram(mtd, to, 0);
1523                 if (ONENAND_IS_2PLANE(this)) {
1524                         ONENAND_SET_BUFFERRAM1(this);
1525                         onenand_update_bufferram(mtd, to + this->writesize, 0);
1526                 }
1527
1528                 ret = this->wait(mtd, FL_WRITING);
1529                 if (ret) {
1530                         printk(KERN_ERR "onenand_write_oob_nolock: write failed %d\n", ret);
1531                         break;
1532                 }
1533
1534                 ret = onenand_verify_oob(mtd, oobbuf, to);
1535                 if (ret) {
1536                         printk(KERN_ERR "onenand_write_oob_nolock: verify failed %d\n", ret);
1537                         break;
1538                 }
1539
1540                 written += thislen;
1541                 if (written == len)
1542                         break;
1543
1544                 to += mtd->writesize;
1545                 buf += thislen;
1546                 column = 0;
1547         }
1548
1549         ops->oobretlen = written;
1550
1551         return ret;
1552 }
1553
1554 /**
1555  * onenand_write - [MTD Interface] write buffer to FLASH
1556  * @param mtd           MTD device structure
1557  * @param to            offset to write to
1558  * @param len           number of bytes to write
1559  * @param retlen        pointer to variable to store the number of written bytes
1560  * @param buf           the data to write
1561  *
1562  * Write with ECC
1563  */
1564 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
1565         size_t *retlen, const u_char *buf)
1566 {
1567         struct mtd_oob_ops ops = {
1568                 .len    = len,
1569                 .ooblen = 0,
1570                 .datbuf = (u_char *) buf,
1571                 .oobbuf = NULL,
1572         };
1573         int ret;
1574
1575         onenand_get_device(mtd, FL_WRITING);
1576         ret = onenand_write_ops_nolock(mtd, to, &ops);
1577         onenand_release_device(mtd);
1578
1579         *retlen = ops.retlen;
1580         return ret;
1581 }
1582
1583 /**
1584  * onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band
1585  * @param mtd:          MTD device structure
1586  * @param to:           offset to write
1587  * @param ops:          oob operation description structure
1588  */
1589 static int onenand_write_oob(struct mtd_info *mtd, loff_t to,
1590                              struct mtd_oob_ops *ops)
1591 {
1592         int ret;
1593
1594         switch (ops->mode) {
1595         case MTD_OOB_PLACE:
1596         case MTD_OOB_AUTO:
1597                 break;
1598         case MTD_OOB_RAW:
1599                 /* Not implemented yet */
1600         default:
1601                 return -EINVAL;
1602         }
1603
1604         onenand_get_device(mtd, FL_WRITING);
1605         if (ops->datbuf)
1606                 ret = onenand_write_ops_nolock(mtd, to, ops);
1607         else
1608                 ret = onenand_write_oob_nolock(mtd, to, ops);
1609         onenand_release_device(mtd);
1610
1611         return ret;
1612 }
1613
1614 /**
1615  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
1616  * @param mtd           MTD device structure
1617  * @param ofs           offset from device start
1618  * @param allowbbt      1, if its allowed to access the bbt area
1619  *
1620  * Check, if the block is bad. Either by reading the bad block table or
1621  * calling of the scan function.
1622  */
1623 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
1624 {
1625         struct onenand_chip *this = mtd->priv;
1626         struct bbm_info *bbm = this->bbm;
1627
1628         /* Return info from the table */
1629         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1630 }
1631
1632 /**
1633  * onenand_erase - [MTD Interface] erase block(s)
1634  * @param mtd           MTD device structure
1635  * @param instr         erase instruction
1636  *
1637  * Erase one ore more blocks
1638  */
1639 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1640 {
1641         struct onenand_chip *this = mtd->priv;
1642         unsigned int block_size;
1643         loff_t addr;
1644         int len;
1645         int ret = 0;
1646
1647         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
1648
1649         block_size = (1 << this->erase_shift);
1650
1651         /* Start address must align on block boundary */
1652         if (unlikely(instr->addr & (block_size - 1))) {
1653                 printk(KERN_ERR "onenand_erase: Unaligned address\n");
1654                 return -EINVAL;
1655         }
1656
1657         /* Length must align on block boundary */
1658         if (unlikely(instr->len & (block_size - 1))) {
1659                 printk(KERN_ERR "onenand_erase: Length not block aligned\n");
1660                 return -EINVAL;
1661         }
1662
1663         /* Do not allow erase past end of device */
1664         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1665                 printk(KERN_ERR "onenand_erase: Erase past end of device\n");
1666                 return -EINVAL;
1667         }
1668
1669         instr->fail_addr = 0xffffffff;
1670
1671         /* Grab the lock and see if the device is available */
1672         onenand_get_device(mtd, FL_ERASING);
1673
1674         /* Loop throught the pages */
1675         len = instr->len;
1676         addr = instr->addr;
1677
1678         instr->state = MTD_ERASING;
1679
1680         while (len) {
1681                 cond_resched();
1682
1683                 /* Check if we have a bad block, we do not erase bad blocks */
1684                 if (onenand_block_isbad_nolock(mtd, addr, 0)) {
1685                         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
1686                         instr->state = MTD_ERASE_FAILED;
1687                         goto erase_exit;
1688                 }
1689
1690                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1691
1692                 onenand_invalidate_bufferram(mtd, addr, block_size);
1693
1694                 ret = this->wait(mtd, FL_ERASING);
1695                 /* Check, if it is write protected */
1696                 if (ret) {
1697                         printk(KERN_ERR "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
1698                         instr->state = MTD_ERASE_FAILED;
1699                         instr->fail_addr = addr;
1700                         goto erase_exit;
1701                 }
1702
1703                 len -= block_size;
1704                 addr += block_size;
1705         }
1706
1707         instr->state = MTD_ERASE_DONE;
1708
1709 erase_exit:
1710
1711         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1712
1713         /* Deselect and wake up anyone waiting on the device */
1714         onenand_release_device(mtd);
1715
1716         /* Do call back function */
1717         if (!ret)
1718                 mtd_erase_callback(instr);
1719
1720         return ret;
1721 }
1722
1723 /**
1724  * onenand_sync - [MTD Interface] sync
1725  * @param mtd           MTD device structure
1726  *
1727  * Sync is actually a wait for chip ready function
1728  */
1729 static void onenand_sync(struct mtd_info *mtd)
1730 {
1731         DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1732
1733         /* Grab the lock and see if the device is available */
1734         onenand_get_device(mtd, FL_SYNCING);
1735
1736         /* Release it and go back */
1737         onenand_release_device(mtd);
1738 }
1739
1740 /**
1741  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1742  * @param mtd           MTD device structure
1743  * @param ofs           offset relative to mtd start
1744  *
1745  * Check whether the block is bad
1746  */
1747 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1748 {
1749         int ret;
1750
1751         /* Check for invalid offset */
1752         if (ofs > mtd->size)
1753                 return -EINVAL;
1754
1755         onenand_get_device(mtd, FL_READING);
1756         ret = onenand_block_isbad_nolock(mtd, ofs, 0);
1757         onenand_release_device(mtd);
1758         return ret;
1759 }
1760
1761 /**
1762  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1763  * @param mtd           MTD device structure
1764  * @param ofs           offset from device start
1765  *
1766  * This is the default implementation, which can be overridden by
1767  * a hardware specific driver.
1768  */
1769 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1770 {
1771         struct onenand_chip *this = mtd->priv;
1772         struct bbm_info *bbm = this->bbm;
1773         u_char buf[2] = {0, 0};
1774         struct mtd_oob_ops ops = {
1775                 .mode = MTD_OOB_PLACE,
1776                 .ooblen = 2,
1777                 .oobbuf = buf,
1778                 .ooboffs = 0,
1779         };
1780         int block;
1781
1782         /* Get block number */
1783         block = ((int) ofs) >> bbm->bbt_erase_shift;
1784         if (bbm->bbt)
1785                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1786
1787         /* We write two bytes, so we dont have to mess with 16 bit access */
1788         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1789         return onenand_write_oob_nolock(mtd, ofs, &ops);
1790 }
1791
1792 /**
1793  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1794  * @param mtd           MTD device structure
1795  * @param ofs           offset relative to mtd start
1796  *
1797  * Mark the block as bad
1798  */
1799 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1800 {
1801         struct onenand_chip *this = mtd->priv;
1802         int ret;
1803
1804         ret = onenand_block_isbad(mtd, ofs);
1805         if (ret) {
1806                 /* If it was bad already, return success and do nothing */
1807                 if (ret > 0)
1808                         return 0;
1809                 return ret;
1810         }
1811
1812         onenand_get_device(mtd, FL_WRITING);
1813         ret = this->block_markbad(mtd, ofs);
1814         onenand_release_device(mtd);
1815         return ret;
1816 }
1817
1818 /**
1819  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
1820  * @param mtd           MTD device structure
1821  * @param ofs           offset relative to mtd start
1822  * @param len           number of bytes to lock or unlock
1823  * @param cmd           lock or unlock command
1824  *
1825  * Lock or unlock one or more blocks
1826  */
1827 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
1828 {
1829         struct onenand_chip *this = mtd->priv;
1830         int start, end, block, value, status;
1831         int wp_status_mask;
1832
1833         start = ofs >> this->erase_shift;
1834         end = len >> this->erase_shift;
1835
1836         if (cmd == ONENAND_CMD_LOCK)
1837                 wp_status_mask = ONENAND_WP_LS;
1838         else
1839                 wp_status_mask = ONENAND_WP_US;
1840
1841         /* Continuous lock scheme */
1842         if (this->options & ONENAND_HAS_CONT_LOCK) {
1843                 /* Set start block address */
1844                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1845                 /* Set end block address */
1846                 this->write_word(start + end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1847                 /* Write lock command */
1848                 this->command(mtd, cmd, 0, 0);
1849
1850                 /* There's no return value */
1851                 this->wait(mtd, FL_LOCKING);
1852
1853                 /* Sanity check */
1854                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1855                     & ONENAND_CTRL_ONGO)
1856                         continue;
1857
1858                 /* Check lock status */
1859                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1860                 if (!(status & wp_status_mask))
1861                         printk(KERN_ERR "wp status = 0x%x\n", status);
1862
1863                 return 0;
1864         }
1865
1866         /* Block lock scheme */
1867         for (block = start; block < start + end; block++) {
1868                 /* Set block address */
1869                 value = onenand_block_address(this, block);
1870                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1871                 /* Select DataRAM for DDP */
1872                 value = onenand_bufferram_address(this, block);
1873                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1874                 /* Set start block address */
1875                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1876                 /* Write lock command */
1877                 this->command(mtd, cmd, 0, 0);
1878
1879                 /* There's no return value */
1880                 this->wait(mtd, FL_LOCKING);
1881
1882                 /* Sanity check */
1883                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1884                     & ONENAND_CTRL_ONGO)
1885                         continue;
1886
1887                 /* Check lock status */
1888                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1889                 if (!(status & wp_status_mask))
1890                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1891         }
1892
1893         return 0;
1894 }
1895
1896 /**
1897  * onenand_lock - [MTD Interface] Lock block(s)
1898  * @param mtd           MTD device structure
1899  * @param ofs           offset relative to mtd start
1900  * @param len           number of bytes to unlock
1901  *
1902  * Lock one or more blocks
1903  */
1904 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
1905 {
1906         int ret;
1907
1908         onenand_get_device(mtd, FL_LOCKING);
1909         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
1910         onenand_release_device(mtd);
1911         return ret;
1912 }
1913
1914 /**
1915  * onenand_unlock - [MTD Interface] Unlock block(s)
1916  * @param mtd           MTD device structure
1917  * @param ofs           offset relative to mtd start
1918  * @param len           number of bytes to unlock
1919  *
1920  * Unlock one or more blocks
1921  */
1922 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1923 {
1924         int ret;
1925
1926         onenand_get_device(mtd, FL_LOCKING);
1927         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
1928         onenand_release_device(mtd);
1929         return ret;
1930 }
1931
1932 /**
1933  * onenand_check_lock_status - [OneNAND Interface] Check lock status
1934  * @param this          onenand chip data structure
1935  *
1936  * Check lock status
1937  */
1938 static void onenand_check_lock_status(struct onenand_chip *this)
1939 {
1940         unsigned int value, block, status;
1941         unsigned int end;
1942
1943         end = this->chipsize >> this->erase_shift;
1944         for (block = 0; block < end; block++) {
1945                 /* Set block address */
1946                 value = onenand_block_address(this, block);
1947                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1948                 /* Select DataRAM for DDP */
1949                 value = onenand_bufferram_address(this, block);
1950                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1951                 /* Set start block address */
1952                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1953
1954                 /* Check lock status */
1955                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1956                 if (!(status & ONENAND_WP_US))
1957                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1958         }
1959 }
1960
1961 /**
1962  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
1963  * @param mtd           MTD device structure
1964  *
1965  * Unlock all blocks
1966  */
1967 static int onenand_unlock_all(struct mtd_info *mtd)
1968 {
1969         struct onenand_chip *this = mtd->priv;
1970
1971         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
1972                 /* Set start block address */
1973                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1974                 /* Write unlock command */
1975                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
1976
1977                 /* There's no return value */
1978                 this->wait(mtd, FL_LOCKING);
1979
1980                 /* Sanity check */
1981                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1982                     & ONENAND_CTRL_ONGO)
1983                         continue;
1984
1985                 /* Workaround for all block unlock in DDP */
1986                 if (ONENAND_IS_DDP(this)) {
1987                         /* 1st block on another chip */
1988                         loff_t ofs = this->chipsize >> 1;
1989                         size_t len = mtd->erasesize;
1990
1991                         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
1992                 }
1993
1994                 onenand_check_lock_status(this);
1995
1996                 return 0;
1997         }
1998
1999         onenand_do_lock_cmd(mtd, 0x0, this->chipsize, ONENAND_CMD_UNLOCK);
2000
2001         return 0;
2002 }
2003
2004 #ifdef CONFIG_MTD_ONENAND_OTP
2005
2006 /* Interal OTP operation */
2007 typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
2008                 size_t *retlen, u_char *buf);
2009
2010 /**
2011  * do_otp_read - [DEFAULT] Read OTP block area
2012  * @param mtd           MTD device structure
2013  * @param from          The offset to read
2014  * @param len           number of bytes to read
2015  * @param retlen        pointer to variable to store the number of readbytes
2016  * @param buf           the databuffer to put/get data
2017  *
2018  * Read OTP block area.
2019  */
2020 static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
2021                 size_t *retlen, u_char *buf)
2022 {
2023         struct onenand_chip *this = mtd->priv;
2024         struct mtd_oob_ops ops = {
2025                 .len    = len,
2026                 .ooblen = 0,
2027                 .datbuf = buf,
2028                 .oobbuf = NULL,
2029         };
2030         int ret;
2031
2032         /* Enter OTP access mode */
2033         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2034         this->wait(mtd, FL_OTPING);
2035
2036         ret = onenand_read_ops_nolock(mtd, from, &ops);
2037
2038         /* Exit OTP access mode */
2039         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2040         this->wait(mtd, FL_RESETING);
2041
2042         return ret;
2043 }
2044
2045 /**
2046  * do_otp_write - [DEFAULT] Write OTP block area
2047  * @param mtd           MTD device structure
2048  * @param to            The offset to write
2049  * @param len           number of bytes to write
2050  * @param retlen        pointer to variable to store the number of write bytes
2051  * @param buf           the databuffer to put/get data
2052  *
2053  * Write OTP block area.
2054  */
2055 static int do_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
2056                 size_t *retlen, u_char *buf)
2057 {
2058         struct onenand_chip *this = mtd->priv;
2059         unsigned char *pbuf = buf;
2060         int ret;
2061         struct mtd_oob_ops ops;
2062
2063         /* Force buffer page aligned */
2064         if (len < mtd->writesize) {
2065                 memcpy(this->page_buf, buf, len);
2066                 memset(this->page_buf + len, 0xff, mtd->writesize - len);
2067                 pbuf = this->page_buf;
2068                 len = mtd->writesize;
2069         }
2070
2071         /* Enter OTP access mode */
2072         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2073         this->wait(mtd, FL_OTPING);
2074
2075         ops.len = len;
2076         ops.ooblen = 0;
2077         ops.datbuf = pbuf;
2078         ops.oobbuf = NULL;
2079         ret = onenand_write_ops_nolock(mtd, to, &ops);
2080         *retlen = ops.retlen;
2081
2082         /* Exit OTP access mode */
2083         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2084         this->wait(mtd, FL_RESETING);
2085
2086         return ret;
2087 }
2088
2089 /**
2090  * do_otp_lock - [DEFAULT] Lock OTP block area
2091  * @param mtd           MTD device structure
2092  * @param from          The offset to lock
2093  * @param len           number of bytes to lock
2094  * @param retlen        pointer to variable to store the number of lock bytes
2095  * @param buf           the databuffer to put/get data
2096  *
2097  * Lock OTP block area.
2098  */
2099 static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
2100                 size_t *retlen, u_char *buf)
2101 {
2102         struct onenand_chip *this = mtd->priv;
2103         struct mtd_oob_ops ops = {
2104                 .mode = MTD_OOB_PLACE,
2105                 .ooblen = len,
2106                 .oobbuf = buf,
2107                 .ooboffs = 0,
2108         };
2109         int ret;
2110
2111         /* Enter OTP access mode */
2112         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2113         this->wait(mtd, FL_OTPING);
2114
2115         ret = onenand_write_oob_nolock(mtd, from, &ops);
2116
2117         *retlen = ops.oobretlen;
2118
2119         /* Exit OTP access mode */
2120         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2121         this->wait(mtd, FL_RESETING);
2122
2123         return ret;
2124 }
2125
2126 /**
2127  * onenand_otp_walk - [DEFAULT] Handle OTP operation
2128  * @param mtd           MTD device structure
2129  * @param from          The offset to read/write
2130  * @param len           number of bytes to read/write
2131  * @param retlen        pointer to variable to store the number of read bytes
2132  * @param buf           the databuffer to put/get data
2133  * @param action        do given action
2134  * @param mode          specify user and factory
2135  *
2136  * Handle OTP operation.
2137  */
2138 static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
2139                         size_t *retlen, u_char *buf,
2140                         otp_op_t action, int mode)
2141 {
2142         struct onenand_chip *this = mtd->priv;
2143         int otp_pages;
2144         int density;
2145         int ret = 0;
2146
2147         *retlen = 0;
2148
2149         density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
2150         if (density < ONENAND_DEVICE_DENSITY_512Mb)
2151                 otp_pages = 20;
2152         else
2153                 otp_pages = 10;
2154
2155         if (mode == MTD_OTP_FACTORY) {
2156                 from += mtd->writesize * otp_pages;
2157                 otp_pages = 64 - otp_pages;
2158         }
2159
2160         /* Check User/Factory boundary */
2161         if (((mtd->writesize * otp_pages) - (from + len)) < 0)
2162                 return 0;
2163
2164         onenand_get_device(mtd, FL_OTPING);
2165         while (len > 0 && otp_pages > 0) {
2166                 if (!action) {  /* OTP Info functions */
2167                         struct otp_info *otpinfo;
2168
2169                         len -= sizeof(struct otp_info);
2170                         if (len <= 0) {
2171                                 ret = -ENOSPC;
2172                                 break;
2173                         }
2174
2175                         otpinfo = (struct otp_info *) buf;
2176                         otpinfo->start = from;
2177                         otpinfo->length = mtd->writesize;
2178                         otpinfo->locked = 0;
2179
2180                         from += mtd->writesize;
2181                         buf += sizeof(struct otp_info);
2182                         *retlen += sizeof(struct otp_info);
2183                 } else {
2184                         size_t tmp_retlen;
2185                         int size = len;
2186
2187                         ret = action(mtd, from, len, &tmp_retlen, buf);
2188
2189                         buf += size;
2190                         len -= size;
2191                         *retlen += size;
2192
2193                         if (ret)
2194                                 break;
2195                 }
2196                 otp_pages--;
2197         }
2198         onenand_release_device(mtd);
2199
2200         return ret;
2201 }
2202
2203 /**
2204  * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
2205  * @param mtd           MTD device structure
2206  * @param buf           the databuffer to put/get data
2207  * @param len           number of bytes to read
2208  *
2209  * Read factory OTP info.
2210  */
2211 static int onenand_get_fact_prot_info(struct mtd_info *mtd,
2212                         struct otp_info *buf, size_t len)
2213 {
2214         size_t retlen;
2215         int ret;
2216
2217         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);
2218
2219         return ret ? : retlen;
2220 }
2221
2222 /**
2223  * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
2224  * @param mtd           MTD device structure
2225  * @param from          The offset to read
2226  * @param len           number of bytes to read
2227  * @param retlen        pointer to variable to store the number of read bytes
2228  * @param buf           the databuffer to put/get data
2229  *
2230  * Read factory OTP area.
2231  */
2232 static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
2233                         size_t len, size_t *retlen, u_char *buf)
2234 {
2235         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
2236 }
2237
2238 /**
2239  * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
2240  * @param mtd           MTD device structure
2241  * @param buf           the databuffer to put/get data
2242  * @param len           number of bytes to read
2243  *
2244  * Read user OTP info.
2245  */
2246 static int onenand_get_user_prot_info(struct mtd_info *mtd,
2247                         struct otp_info *buf, size_t len)
2248 {
2249         size_t retlen;
2250         int ret;
2251
2252         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);
2253
2254         return ret ? : retlen;
2255 }
2256
2257 /**
2258  * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
2259  * @param mtd           MTD device structure
2260  * @param from          The offset to read
2261  * @param len           number of bytes to read
2262  * @param retlen        pointer to variable to store the number of read bytes
2263  * @param buf           the databuffer to put/get data
2264  *
2265  * Read user OTP area.
2266  */
2267 static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
2268                         size_t len, size_t *retlen, u_char *buf)
2269 {
2270         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
2271 }
2272
2273 /**
2274  * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
2275  * @param mtd           MTD device structure
2276  * @param from          The offset to write
2277  * @param len           number of bytes to write
2278  * @param retlen        pointer to variable to store the number of write bytes
2279  * @param buf           the databuffer to put/get data
2280  *
2281  * Write user OTP area.
2282  */
2283 static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
2284                         size_t len, size_t *retlen, u_char *buf)
2285 {
2286         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
2287 }
2288
2289 /**
2290  * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
2291  * @param mtd           MTD device structure
2292  * @param from          The offset to lock
2293  * @param len           number of bytes to unlock
2294  *
2295  * Write lock mark on spare area in page 0 in OTP block
2296  */
2297 static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
2298                         size_t len)
2299 {
2300         unsigned char oob_buf[64];
2301         size_t retlen;
2302         int ret;
2303
2304         memset(oob_buf, 0xff, mtd->oobsize);
2305         /*
2306          * Note: OTP lock operation
2307          *       OTP block : 0xXXFC
2308          *       1st block : 0xXXF3 (If chip support)
2309          *       Both      : 0xXXF0 (If chip support)
2310          */
2311         oob_buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
2312
2313         /*
2314          * Write lock mark to 8th word of sector0 of page0 of the spare0.
2315          * We write 16 bytes spare area instead of 2 bytes.
2316          */
2317         from = 0;
2318         len = 16;
2319
2320         ret = onenand_otp_walk(mtd, from, len, &retlen, oob_buf, do_otp_lock, MTD_OTP_USER);
2321
2322         return ret ? : retlen;
2323 }
2324 #endif  /* CONFIG_MTD_ONENAND_OTP */
2325
2326 /**
2327  * onenand_check_features - Check and set OneNAND features
2328  * @param mtd           MTD data structure
2329  *
2330  * Check and set OneNAND features
2331  * - lock scheme
2332  * - two plane
2333  */
2334 static void onenand_check_features(struct mtd_info *mtd)
2335 {
2336         struct onenand_chip *this = mtd->priv;
2337         unsigned int density, process;
2338
2339         /* Lock scheme depends on density and process */
2340         density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
2341         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
2342
2343         /* Lock scheme */
2344         switch (density) {
2345         case ONENAND_DEVICE_DENSITY_4Gb:
2346                 this->options |= ONENAND_HAS_2PLANE;
2347
2348         case ONENAND_DEVICE_DENSITY_2Gb:
2349                 /* 2Gb DDP don't have 2 plane */
2350                 if (!ONENAND_IS_DDP(this))
2351                         this->options |= ONENAND_HAS_2PLANE;
2352                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2353
2354         case ONENAND_DEVICE_DENSITY_1Gb:
2355                 /* A-Die has all block unlock */
2356                 if (process)
2357                         this->options |= ONENAND_HAS_UNLOCK_ALL;
2358                 break;
2359
2360         default:
2361                 /* Some OneNAND has continuous lock scheme */
2362                 if (!process)
2363                         this->options |= ONENAND_HAS_CONT_LOCK;
2364                 break;
2365         }
2366
2367         if (this->options & ONENAND_HAS_CONT_LOCK)
2368                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
2369         if (this->options & ONENAND_HAS_UNLOCK_ALL)
2370                 printk(KERN_DEBUG "Chip support all block unlock\n");
2371         if (this->options & ONENAND_HAS_2PLANE)
2372                 printk(KERN_DEBUG "Chip has 2 plane\n");
2373 }
2374
2375 /**
2376  * onenand_print_device_info - Print device & version ID
2377  * @param device        device ID
2378  * @param version       version ID
2379  *
2380  * Print device & version ID
2381  */
2382 static void onenand_print_device_info(int device, int version)
2383 {
2384         int vcc, demuxed, ddp, density;
2385
2386         vcc = device & ONENAND_DEVICE_VCC_MASK;
2387         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
2388         ddp = device & ONENAND_DEVICE_IS_DDP;
2389         density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
2390         printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
2391                 demuxed ? "" : "Muxed ",
2392                 ddp ? "(DDP)" : "",
2393                 (16 << density),
2394                 vcc ? "2.65/3.3" : "1.8",
2395                 device);
2396         printk(KERN_INFO "OneNAND version = 0x%04x\n", version);
2397 }
2398
2399 static const struct onenand_manufacturers onenand_manuf_ids[] = {
2400         {ONENAND_MFR_SAMSUNG, "Samsung"},
2401 };
2402
2403 /**
2404  * onenand_check_maf - Check manufacturer ID
2405  * @param manuf         manufacturer ID
2406  *
2407  * Check manufacturer ID
2408  */
2409 static int onenand_check_maf(int manuf)
2410 {
2411         int size = ARRAY_SIZE(onenand_manuf_ids);
2412         char *name;
2413         int i;
2414
2415         for (i = 0; i < size; i++)
2416                 if (manuf == onenand_manuf_ids[i].id)
2417                         break;
2418
2419         if (i < size)
2420                 name = onenand_manuf_ids[i].name;
2421         else
2422                 name = "Unknown";
2423
2424         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
2425
2426         return (i == size);
2427 }
2428
2429 /**
2430  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
2431  * @param mtd           MTD device structure
2432  *
2433  * OneNAND detection method:
2434  *   Compare the values from command with ones from register
2435  */
2436 static int onenand_probe(struct mtd_info *mtd)
2437 {
2438         struct onenand_chip *this = mtd->priv;
2439         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
2440         int density;
2441         int syscfg;
2442
2443         /* Save system configuration 1 */
2444         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2445         /* Clear Sync. Burst Read mode to read BootRAM */
2446         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);
2447
2448         /* Send the command for reading device ID from BootRAM */
2449         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
2450
2451         /* Read manufacturer and device IDs from BootRAM */
2452         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
2453         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
2454
2455         /* Reset OneNAND to read default register values */
2456         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
2457         /* Wait reset */
2458         this->wait(mtd, FL_RESETING);
2459
2460         /* Restore system configuration 1 */
2461         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2462
2463         /* Check manufacturer ID */
2464         if (onenand_check_maf(bram_maf_id))
2465                 return -ENXIO;
2466
2467         /* Read manufacturer and device IDs from Register */
2468         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
2469         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
2470         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
2471
2472         /* Check OneNAND device */
2473         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
2474                 return -ENXIO;
2475
2476         /* Flash device information */
2477         onenand_print_device_info(dev_id, ver_id);
2478         this->device_id = dev_id;
2479         this->version_id = ver_id;
2480
2481         density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
2482         this->chipsize = (16 << density) << 20;
2483         /* Set density mask. it is used for DDP */
2484         if (ONENAND_IS_DDP(this))
2485                 this->density_mask = (1 << (density + 6));
2486         else
2487                 this->density_mask = 0;
2488
2489         /* OneNAND page size & block size */
2490         /* The data buffer size is equal to page size */
2491         mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
2492         mtd->oobsize = mtd->writesize >> 5;
2493         /* Pages per a block are always 64 in OneNAND */
2494         mtd->erasesize = mtd->writesize << 6;
2495
2496         this->erase_shift = ffs(mtd->erasesize) - 1;
2497         this->page_shift = ffs(mtd->writesize) - 1;
2498         this->page_mask = (1 << (this->erase_shift - this->page_shift)) - 1;
2499         /* It's real page size */
2500         this->writesize = mtd->writesize;
2501
2502         /* REVIST: Multichip handling */
2503
2504         mtd->size = this->chipsize;
2505
2506         /* Check OneNAND features */
2507         onenand_check_features(mtd);
2508
2509         /*
2510          * We emulate the 4KiB page and 256KiB erase block size
2511          * But oobsize is still 64 bytes.
2512          * It is only valid if you turn on 2X program support,
2513          * Otherwise it will be ignored by compiler.
2514          */
2515         if (ONENAND_IS_2PLANE(this)) {
2516                 mtd->writesize <<= 1;
2517                 mtd->erasesize <<= 1;
2518         }
2519
2520         return 0;
2521 }
2522
2523 /**
2524  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
2525  * @param mtd           MTD device structure
2526  */
2527 static int onenand_suspend(struct mtd_info *mtd)
2528 {
2529         return onenand_get_device(mtd, FL_PM_SUSPENDED);
2530 }
2531
2532 /**
2533  * onenand_resume - [MTD Interface] Resume the OneNAND flash
2534  * @param mtd           MTD device structure
2535  */
2536 static void onenand_resume(struct mtd_info *mtd)
2537 {
2538         struct onenand_chip *this = mtd->priv;
2539
2540         if (this->state == FL_PM_SUSPENDED)
2541                 onenand_release_device(mtd);
2542         else
2543                 printk(KERN_ERR "resume() called for the chip which is not"
2544                                 "in suspended state\n");
2545 }
2546
2547 /**
2548  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
2549  * @param mtd           MTD device structure
2550  * @param maxchips      Number of chips to scan for
2551  *
2552  * This fills out all the not initialized function pointers
2553  * with the defaults.
2554  * The flash ID is read and the mtd/chip structures are
2555  * filled with the appropriate values.
2556  */
2557 int onenand_scan(struct mtd_info *mtd, int maxchips)
2558 {
2559         int i;
2560         struct onenand_chip *this = mtd->priv;
2561
2562         if (!this->read_word)
2563                 this->read_word = onenand_readw;
2564         if (!this->write_word)
2565                 this->write_word = onenand_writew;
2566
2567         if (!this->command)
2568                 this->command = onenand_command;
2569         if (!this->wait)
2570                 onenand_setup_wait(mtd);
2571
2572         if (!this->read_bufferram)
2573                 this->read_bufferram = onenand_read_bufferram;
2574         if (!this->write_bufferram)
2575                 this->write_bufferram = onenand_write_bufferram;
2576
2577         if (!this->block_markbad)
2578                 this->block_markbad = onenand_default_block_markbad;
2579         if (!this->scan_bbt)
2580                 this->scan_bbt = onenand_default_bbt;
2581
2582         if (onenand_probe(mtd))
2583                 return -ENXIO;
2584
2585         /* Set Sync. Burst Read after probing */
2586         if (this->mmcontrol) {
2587                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
2588                 this->read_bufferram = onenand_sync_read_bufferram;
2589         }
2590
2591         /* Allocate buffers, if necessary */
2592         if (!this->page_buf) {
2593                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
2594                 if (!this->page_buf) {
2595                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
2596                         return -ENOMEM;
2597                 }
2598                 this->options |= ONENAND_PAGEBUF_ALLOC;
2599         }
2600         if (!this->oob_buf) {
2601                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
2602                 if (!this->oob_buf) {
2603                         printk(KERN_ERR "onenand_scan(): Can't allocate oob_buf\n");
2604                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
2605                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
2606                                 kfree(this->page_buf);
2607                         }
2608                         return -ENOMEM;
2609                 }
2610                 this->options |= ONENAND_OOBBUF_ALLOC;
2611         }
2612
2613         this->state = FL_READY;
2614         init_waitqueue_head(&this->wq);
2615         spin_lock_init(&this->chip_lock);
2616
2617         /*
2618          * Allow subpage writes up to oobsize.
2619          */
2620         switch (mtd->oobsize) {
2621         case 64:
2622                 this->ecclayout = &onenand_oob_64;
2623                 mtd->subpage_sft = 2;
2624                 break;
2625
2626         case 32:
2627                 this->ecclayout = &onenand_oob_32;
2628                 mtd->subpage_sft = 1;
2629                 break;
2630
2631         default:
2632                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
2633                         mtd->oobsize);
2634                 mtd->subpage_sft = 0;
2635                 /* To prevent kernel oops */
2636                 this->ecclayout = &onenand_oob_32;
2637                 break;
2638         }
2639
2640         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
2641
2642         /*
2643          * The number of bytes available for a client to place data into
2644          * the out of band area
2645          */
2646         this->ecclayout->oobavail = 0;
2647         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
2648             this->ecclayout->oobfree[i].length; i++)
2649                 this->ecclayout->oobavail +=
2650                         this->ecclayout->oobfree[i].length;
2651         mtd->oobavail = this->ecclayout->oobavail;
2652
2653         mtd->ecclayout = this->ecclayout;
2654
2655         /* Fill in remaining MTD driver data */
2656         mtd->type = MTD_NANDFLASH;
2657         mtd->flags = MTD_CAP_NANDFLASH;
2658         mtd->erase = onenand_erase;
2659         mtd->point = NULL;
2660         mtd->unpoint = NULL;
2661         mtd->read = onenand_read;
2662         mtd->write = onenand_write;
2663         mtd->read_oob = onenand_read_oob;
2664         mtd->write_oob = onenand_write_oob;
2665 #ifdef CONFIG_MTD_ONENAND_OTP
2666         mtd->get_fact_prot_info = onenand_get_fact_prot_info;
2667         mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;
2668         mtd->get_user_prot_info = onenand_get_user_prot_info;
2669         mtd->read_user_prot_reg = onenand_read_user_prot_reg;
2670         mtd->write_user_prot_reg = onenand_write_user_prot_reg;
2671         mtd->lock_user_prot_reg = onenand_lock_user_prot_reg;
2672 #endif
2673         mtd->sync = onenand_sync;
2674         mtd->lock = onenand_lock;
2675         mtd->unlock = onenand_unlock;
2676         mtd->suspend = onenand_suspend;
2677         mtd->resume = onenand_resume;
2678         mtd->block_isbad = onenand_block_isbad;
2679         mtd->block_markbad = onenand_block_markbad;
2680         mtd->owner = THIS_MODULE;
2681
2682         /* Unlock whole block */
2683         onenand_unlock_all(mtd);
2684
2685         return this->scan_bbt(mtd);
2686 }
2687
2688 /**
2689  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
2690  * @param mtd           MTD device structure
2691  */
2692 void onenand_release(struct mtd_info *mtd)
2693 {
2694         struct onenand_chip *this = mtd->priv;
2695
2696 #ifdef CONFIG_MTD_PARTITIONS
2697         /* Deregister partitions */
2698         del_mtd_partitions (mtd);
2699 #endif
2700         /* Deregister the device */
2701         del_mtd_device (mtd);
2702
2703         /* Free bad block table memory, if allocated */
2704         if (this->bbm) {
2705                 struct bbm_info *bbm = this->bbm;
2706                 kfree(bbm->bbt);
2707                 kfree(this->bbm);
2708         }
2709         /* Buffers allocated by onenand_scan */
2710         if (this->options & ONENAND_PAGEBUF_ALLOC)
2711                 kfree(this->page_buf);
2712         if (this->options & ONENAND_OOBBUF_ALLOC)
2713                 kfree(this->oob_buf);
2714 }
2715
2716 EXPORT_SYMBOL_GPL(onenand_scan);
2717 EXPORT_SYMBOL_GPL(onenand_release);
2718
2719 MODULE_LICENSE("GPL");
2720 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
2721 MODULE_DESCRIPTION("Generic OneNAND flash driver code");