drivers/mtd/onenand/onenand_base.c

   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright (C) 2005-2006 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/sched.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/jiffies.h>
  18 #include <linux/mtd/mtd.h>
  19 #include <linux/mtd/onenand.h>
  20 #include <linux/mtd/partitions.h>
  21
  22 #include <asm/io.h>
  23
  24 /**
  25  * onenand_oob_64 - oob info for large (2KB) page
  26  */
  27 static struct nand_ecclayout onenand_oob_64 = {
  28         .eccbytes       = 20,
  29         .eccpos         = {
  30                 8, 9, 10, 11, 12,
  31                 24, 25, 26, 27, 28,
  32                 40, 41, 42, 43, 44,
  33                 56, 57, 58, 59, 60,
  34                 },
  35         .oobfree        = {
  36                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  37                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  38         }
  39 };
  40
  41 /**
  42  * onenand_oob_32 - oob info for middle (1KB) page
  43  */
  44 static struct nand_ecclayout onenand_oob_32 = {
  45         .eccbytes       = 10,
  46         .eccpos         = {
  47                 8, 9, 10, 11, 12,
  48                 24, 25, 26, 27, 28,
  49                 },
  50         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  51 };
  52
  53 static const unsigned char ffchars[] = {
  54         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  55         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  56         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  57         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  58         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  59         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  60         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  61         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
  62 };
  63
  64 /**
  65  * onenand_readw - [OneNAND Interface] Read OneNAND register
  66  * @param addr          address to read
  67  *
  68  * Read OneNAND register
  69  */
  70 static unsigned short onenand_readw(void __iomem *addr)
  71 {
  72         return readw(addr);
  73 }
  74
  75 /**
  76  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
  77  * @param value         value to write
  78  * @param addr          address to write
  79  *
  80  * Write OneNAND register with value
  81  */
  82 static void onenand_writew(unsigned short value, void __iomem *addr)
  83 {
  84         writew(value, addr);
  85 }
  86
  87 /**
  88  * onenand_block_address - [DEFAULT] Get block address
  89  * @param this          onenand chip data structure
  90  * @param block         the block
  91  * @return              translated block address if DDP, otherwise same
  92  *
  93  * Setup Start Address 1 Register (F100h)
  94  */
  95 static int onenand_block_address(struct onenand_chip *this, int block)
  96 {
  97         if (this->device_id & ONENAND_DEVICE_IS_DDP) {
  98                 /* Device Flash Core select, NAND Flash Block Address */
  99                 int dfs = 0;
 100
 101                 if (block & this->density_mask)
 102                         dfs = 1;
 103
 104                 return (dfs << ONENAND_DDP_SHIFT) |
 105                         (block & (this->density_mask - 1));
 106         }
 107
 108         return block;
 109 }
 110
 111 /**
 112  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 113  * @param this          onenand chip data structure
 114  * @param block         the block
 115  * @return              set DBS value if DDP, otherwise 0
 116  *
 117  * Setup Start Address 2 Register (F101h) for DDP
 118  */
 119 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 120 {
 121         if (this->device_id & ONENAND_DEVICE_IS_DDP) {
 122                 /* Device BufferRAM Select */
 123                 int dbs = 0;
 124
 125                 if (block & this->density_mask)
 126                         dbs = 1;
 127
 128                 return (dbs << ONENAND_DDP_SHIFT);
 129         }
 130
 131         return 0;
 132 }
 133
 134 /**
 135  * onenand_page_address - [DEFAULT] Get page address
 136  * @param page          the page address
 137  * @param sector        the sector address
 138  * @return              combined page and sector address
 139  *
 140  * Setup Start Address 8 Register (F107h)
 141  */
 142 static int onenand_page_address(int page, int sector)
 143 {
 144         /* Flash Page Address, Flash Sector Address */
 145         int fpa, fsa;
 146
 147         fpa = page & ONENAND_FPA_MASK;
 148         fsa = sector & ONENAND_FSA_MASK;
 149
 150         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 151 }
 152
 153 /**
 154  * onenand_buffer_address - [DEFAULT] Get buffer address
 155  * @param dataram1      DataRAM index
 156  * @param sectors       the sector address
 157  * @param count         the number of sectors
 158  * @return              the start buffer value
 159  *
 160  * Setup Start Buffer Register (F200h)
 161  */
 162 static int onenand_buffer_address(int dataram1, int sectors, int count)
 163 {
 164         int bsa, bsc;
 165
 166         /* BufferRAM Sector Address */
 167         bsa = sectors & ONENAND_BSA_MASK;
 168
 169         if (dataram1)
 170                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 171         else
 172                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 173
 174         /* BufferRAM Sector Count */
 175         bsc = count & ONENAND_BSC_MASK;
 176
 177         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 178 }
 179
 180 /**
 181  * onenand_command - [DEFAULT] Send command to OneNAND device
 182  * @param mtd           MTD device structure
 183  * @param cmd           the command to be sent
 184  * @param addr          offset to read from or write to
 185  * @param len           number of bytes to read or write
 186  *
 187  * Send command to OneNAND device. This function is used for middle/large page
 188  * devices (1KB/2KB Bytes per page)
 189  */
 190 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 191 {
 192         struct onenand_chip *this = mtd->priv;
 193         int value, readcmd = 0, block_cmd = 0;
 194         int block, page;
 195         /* Now we use page size operation */
 196         int sectors = 4, count = 4;
 197
 198         /* Address translation */
 199         switch (cmd) {
 200         case ONENAND_CMD_UNLOCK:
 201         case ONENAND_CMD_LOCK:
 202         case ONENAND_CMD_LOCK_TIGHT:
 203         case ONENAND_CMD_UNLOCK_ALL:
 204                 block = -1;
 205                 page = -1;
 206                 break;
 207
 208         case ONENAND_CMD_ERASE:
 209         case ONENAND_CMD_BUFFERRAM:
 210         case ONENAND_CMD_OTP_ACCESS:
 211                 block_cmd = 1;
 212                 block = (int) (addr >> this->erase_shift);
 213                 page = -1;
 214                 break;
 215
 216         default:
 217                 block = (int) (addr >> this->erase_shift);
 218                 page = (int) (addr >> this->page_shift);
 219                 page &= this->page_mask;
 220                 break;
 221         }
 222
 223         /* NOTE: The setting order of the registers is very important! */
 224         if (cmd == ONENAND_CMD_BUFFERRAM) {
 225                 /* Select DataRAM for DDP */
 226                 value = onenand_bufferram_address(this, block);
 227                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 228
 229                 /* Switch to the next data buffer */
 230                 ONENAND_SET_NEXT_BUFFERRAM(this);
 231
 232                 return 0;
 233         }
 234
 235         if (block != -1) {
 236                 /* Write 'DFS, FBA' of Flash */
 237                 value = onenand_block_address(this, block);
 238                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 239
 240                 if (block_cmd) {
 241                         /* Select DataRAM for DDP */
 242                         value = onenand_bufferram_address(this, block);
 243                         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 244                 }
 245         }
 246
 247         if (page != -1) {
 248                 int dataram;
 249
 250                 switch (cmd) {
 251                 case ONENAND_CMD_READ:
 252                 case ONENAND_CMD_READOOB:
 253                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 254                         readcmd = 1;
 255                         break;
 256
 257                 default:
 258                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 259                         break;
 260                 }
 261
 262                 /* Write 'FPA, FSA' of Flash */
 263                 value = onenand_page_address(page, sectors);
 264                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 265
 266                 /* Write 'BSA, BSC' of DataRAM */
 267                 value = onenand_buffer_address(dataram, sectors, count);
 268                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 269
 270                 if (readcmd) {
 271                         /* Select DataRAM for DDP */
 272                         value = onenand_bufferram_address(this, block);
 273                         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 274                 }
 275         }
 276
 277         /* Interrupt clear */
 278         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 279
 280         /* Write command */
 281         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 282
 283         return 0;
 284 }
 285
 286 /**
 287  * onenand_wait - [DEFAULT] wait until the command is done
 288  * @param mtd           MTD device structure
 289  * @param state         state to select the max. timeout value
 290  *
 291  * Wait for command done. This applies to all OneNAND command
 292  * Read can take up to 30us, erase up to 2ms and program up to 350us
 293  * according to general OneNAND specs
 294  */
 295 static int onenand_wait(struct mtd_info *mtd, int state)
 296 {
 297         struct onenand_chip * this = mtd->priv;
 298         unsigned long timeout;
 299         unsigned int flags = ONENAND_INT_MASTER;
 300         unsigned int interrupt = 0;
 301         unsigned int ctrl, ecc;
 302
 303         /* The 20 msec is enough */
 304         timeout = jiffies + msecs_to_jiffies(20);
 305         while (time_before(jiffies, timeout)) {
 306                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 307
 308                 if (interrupt & flags)
 309                         break;
 310
 311                 if (state != FL_READING)
 312                         cond_resched();
 313                 touch_softlockup_watchdog();
 314         }
 315         /* To get correct interrupt status in timeout case */
 316         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 317
 318         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 319
 320         if (ctrl & ONENAND_CTRL_ERROR) {
 321                 /* It maybe occur at initial bad block */
 322                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
 323                 /* Clear other interrupt bits for preventing ECC error */
 324                 interrupt &= ONENAND_INT_MASTER;
 325         }
 326
 327         if (ctrl & ONENAND_CTRL_LOCK) {
 328                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
 329                 return -EACCES;
 330         }
 331
 332         if (interrupt & ONENAND_INT_READ) {
 333                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 334                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 335                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
 336                         return -EBADMSG;
 337                 }
 338         }
 339
 340         return 0;
 341 }
 342
 343 /*
 344  * onenand_interrupt - [DEFAULT] onenand interrupt handler
 345  * @param irq           onenand interrupt number
 346  * @param dev_id        interrupt data
 347  *
 348  * complete the work
 349  */
 350 static irqreturn_t onenand_interrupt(int irq, void *data)
 351 {
 352         struct onenand_chip *this = (struct onenand_chip *) data;
 353
 354         /* To handle shared interrupt */
 355         if (!this->complete.done)
 356                 complete(&this->complete);
 357
 358         return IRQ_HANDLED;
 359 }
 360
 361 /*
 362  * onenand_interrupt_wait - [DEFAULT] wait until the command is done
 363  * @param mtd           MTD device structure
 364  * @param state         state to select the max. timeout value
 365  *
 366  * Wait for command done.
 367  */
 368 static int onenand_interrupt_wait(struct mtd_info *mtd, int state)
 369 {
 370         struct onenand_chip *this = mtd->priv;
 371
 372         /* To prevent soft lockup */
 373         touch_softlockup_watchdog();
 374
 375         wait_for_completion(&this->complete);
 376
 377         return onenand_wait(mtd, state);
 378 }
 379
 380 /*
 381  * onenand_try_interrupt_wait - [DEFAULT] try interrupt wait
 382  * @param mtd           MTD device structure
 383  * @param state         state to select the max. timeout value
 384  *
 385  * Try interrupt based wait (It is used one-time)
 386  */
 387 static int onenand_try_interrupt_wait(struct mtd_info *mtd, int state)
 388 {
 389         struct onenand_chip *this = mtd->priv;
 390         unsigned long remain, timeout;
 391
 392         /* We use interrupt wait first */
 393         this->wait = onenand_interrupt_wait;
 394
 395         /* To prevent soft lockup */
 396         touch_softlockup_watchdog();
 397
 398         timeout = msecs_to_jiffies(100);
 399         remain = wait_for_completion_timeout(&this->complete, timeout);
 400         if (!remain) {
 401                 printk(KERN_INFO "OneNAND: There's no interrupt. "
 402                                 "We use the normal wait\n");
 403
 404                 /* Release the irq */
 405                 free_irq(this->irq, this);
 406
 407                 this->wait = onenand_wait;
 408         }
 409
 410         return onenand_wait(mtd, state);
 411 }
 412
 413 /*
 414  * onenand_setup_wait - [OneNAND Interface] setup onenand wait method
 415  * @param mtd           MTD device structure
 416  *
 417  * There's two method to wait onenand work
 418  * 1. polling - read interrupt status register
 419  * 2. interrupt - use the kernel interrupt method
 420  */
 421 static void onenand_setup_wait(struct mtd_info *mtd)
 422 {
 423         struct onenand_chip *this = mtd->priv;
 424         int syscfg;
 425
 426         init_completion(&this->complete);
 427
 428         if (this->irq <= 0) {
 429                 this->wait = onenand_wait;
 430                 return;
 431         }
 432
 433         if (request_irq(this->irq, &onenand_interrupt,
 434                                 IRQF_SHARED, "onenand", this)) {
 435                 /* If we can't get irq, use the normal wait */
 436                 this->wait = onenand_wait;
 437                 return;
 438         }
 439
 440         /* Enable interrupt */
 441         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
 442         syscfg |= ONENAND_SYS_CFG1_IOBE;
 443         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
 444
 445         this->wait = onenand_try_interrupt_wait;
 446 }
 447
 448 /**
 449  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 450  * @param mtd           MTD data structure
 451  * @param area          BufferRAM area
 452  * @return              offset given area
 453  *
 454  * Return BufferRAM offset given area
 455  */
 456 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 457 {
 458         struct onenand_chip *this = mtd->priv;
 459
 460         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 461                 if (area == ONENAND_DATARAM)
 462                         return mtd->writesize;
 463                 if (area == ONENAND_SPARERAM)
 464                         return mtd->oobsize;
 465         }
 466
 467         return 0;
 468 }
 469
 470 /**
 471  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 472  * @param mtd           MTD data structure
 473  * @param area          BufferRAM area
 474  * @param buffer        the databuffer to put/get data
 475  * @param offset        offset to read from or write to
 476  * @param count         number of bytes to read/write
 477  *
 478  * Read the BufferRAM area
 479  */
 480 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 481                 unsigned char *buffer, int offset, size_t count)
 482 {
 483         struct onenand_chip *this = mtd->priv;
 484         void __iomem *bufferram;
 485
 486         bufferram = this->base + area;
 487
 488         bufferram += onenand_bufferram_offset(mtd, area);
 489
 490         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 491                 unsigned short word;
 492
 493                 /* Align with word(16-bit) size */
 494                 count--;
 495
 496                 /* Read word and save byte */
 497                 word = this->read_word(bufferram + offset + count);
 498                 buffer[count] = (word & 0xff);
 499         }
 500
 501         memcpy(buffer, bufferram + offset, count);
 502
 503         return 0;
 504 }
 505
 506 /**
 507  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 508  * @param mtd           MTD data structure
 509  * @param area          BufferRAM area
 510  * @param buffer        the databuffer to put/get data
 511  * @param offset        offset to read from or write to
 512  * @param count         number of bytes to read/write
 513  *
 514  * Read the BufferRAM area with Sync. Burst Mode
 515  */
 516 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 517                 unsigned char *buffer, int offset, size_t count)
 518 {
 519         struct onenand_chip *this = mtd->priv;
 520         void __iomem *bufferram;
 521
 522         bufferram = this->base + area;
 523
 524         bufferram += onenand_bufferram_offset(mtd, area);
 525
 526         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 527
 528         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 529                 unsigned short word;
 530
 531                 /* Align with word(16-bit) size */
 532                 count--;
 533
 534                 /* Read word and save byte */
 535                 word = this->read_word(bufferram + offset + count);
 536                 buffer[count] = (word & 0xff);
 537         }
 538
 539         memcpy(buffer, bufferram + offset, count);
 540
 541         this->mmcontrol(mtd, 0);
 542
 543         return 0;
 544 }
 545
 546 /**
 547  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 548  * @param mtd           MTD data structure
 549  * @param area          BufferRAM area
 550  * @param buffer        the databuffer to put/get data
 551  * @param offset        offset to read from or write to
 552  * @param count         number of bytes to read/write
 553  *
 554  * Write the BufferRAM area
 555  */
 556 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 557                 const unsigned char *buffer, int offset, size_t count)
 558 {
 559         struct onenand_chip *this = mtd->priv;
 560         void __iomem *bufferram;
 561
 562         bufferram = this->base + area;
 563
 564         bufferram += onenand_bufferram_offset(mtd, area);
 565
 566         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 567                 unsigned short word;
 568                 int byte_offset;
 569
 570                 /* Align with word(16-bit) size */
 571                 count--;
 572
 573                 /* Calculate byte access offset */
 574                 byte_offset = offset + count;
 575
 576                 /* Read word and save byte */
 577                 word = this->read_word(bufferram + byte_offset);
 578                 word = (word & ~0xff) | buffer[count];
 579                 this->write_word(word, bufferram + byte_offset);
 580         }
 581
 582         memcpy(bufferram + offset, buffer, count);
 583
 584         return 0;
 585 }
 586
 587 /**
 588  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 589  * @param mtd           MTD data structure
 590  * @param addr          address to check
 591  * @return              1 if there are valid data, otherwise 0
 592  *
 593  * Check bufferram if there is data we required
 594  */
 595 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 596 {
 597         struct onenand_chip *this = mtd->priv;
 598         int block, page;
 599         int i;
 600
 601         block = (int) (addr >> this->erase_shift);
 602         page = (int) (addr >> this->page_shift);
 603         page &= this->page_mask;
 604
 605         i = ONENAND_CURRENT_BUFFERRAM(this);
 606
 607         /* Is there valid data? */
 608         if (this->bufferram[i].block == block &&
 609             this->bufferram[i].page == page &&
 610             this->bufferram[i].valid)
 611                 return 1;
 612
 613         return 0;
 614 }
 615
 616 /**
 617  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 618  * @param mtd           MTD data structure
 619  * @param addr          address to update
 620  * @param valid         valid flag
 621  *
 622  * Update BufferRAM information
 623  */
 624 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 625                 int valid)
 626 {
 627         struct onenand_chip *this = mtd->priv;
 628         int block, page;
 629         int i;
 630
 631         block = (int) (addr >> this->erase_shift);
 632         page = (int) (addr >> this->page_shift);
 633         page &= this->page_mask;
 634
 635         /* Invalidate BufferRAM */
 636         for (i = 0; i < MAX_BUFFERRAM; i++) {
 637                 if (this->bufferram[i].block == block &&
 638                     this->bufferram[i].page == page)
 639                         this->bufferram[i].valid = 0;
 640         }
 641
 642         /* Update BufferRAM */
 643         i = ONENAND_CURRENT_BUFFERRAM(this);
 644         this->bufferram[i].block = block;
 645         this->bufferram[i].page = page;
 646         this->bufferram[i].valid = valid;
 647
 648         return 0;
 649 }
 650
 651 /**
 652  * onenand_get_device - [GENERIC] Get chip for selected access
 653  * @param mtd           MTD device structure
 654  * @param new_state     the state which is requested
 655  *
 656  * Get the device and lock it for exclusive access
 657  */
 658 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 659 {
 660         struct onenand_chip *this = mtd->priv;
 661         DECLARE_WAITQUEUE(wait, current);
 662
 663         /*
 664          * Grab the lock and see if the device is available
 665          */
 666         while (1) {
 667                 spin_lock(&this->chip_lock);
 668                 if (this->state == FL_READY) {
 669                         this->state = new_state;
 670                         spin_unlock(&this->chip_lock);
 671                         break;
 672                 }
 673                 if (new_state == FL_PM_SUSPENDED) {
 674                         spin_unlock(&this->chip_lock);
 675                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 676                 }
 677                 set_current_state(TASK_UNINTERRUPTIBLE);
 678                 add_wait_queue(&this->wq, &wait);
 679                 spin_unlock(&this->chip_lock);
 680                 schedule();
 681                 remove_wait_queue(&this->wq, &wait);
 682         }
 683
 684         return 0;
 685 }
 686
 687 /**
 688  * onenand_release_device - [GENERIC] release chip
 689  * @param mtd           MTD device structure
 690  *
 691  * Deselect, release chip lock and wake up anyone waiting on the device
 692  */
 693 static void onenand_release_device(struct mtd_info *mtd)
 694 {
 695         struct onenand_chip *this = mtd->priv;
 696
 697         /* Release the chip */
 698         spin_lock(&this->chip_lock);
 699         this->state = FL_READY;
 700         wake_up(&this->wq);
 701         spin_unlock(&this->chip_lock);
 702 }
 703
 704 /**
 705  * onenand_read - [MTD Interface] Read data from flash
 706  * @param mtd           MTD device structure
 707  * @param from          offset to read from
 708  * @param len           number of bytes to read
 709  * @param retlen        pointer to variable to store the number of read bytes
 710  * @param buf           the databuffer to put data
 711  *
 712  * Read with ecc
 713 */
 714 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 715         size_t *retlen, u_char *buf)
 716 {
 717         struct onenand_chip *this = mtd->priv;
 718         int read = 0, column;
 719         int thislen;
 720         int ret = 0;
 721
 722         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 723
 724         /* Do not allow reads past end of device */
 725         if ((from + len) > mtd->size) {
 726                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read: Attempt read beyond end of device\n");
 727                 *retlen = 0;
 728                 return -EINVAL;
 729         }
 730
 731         /* Grab the lock and see if the device is available */
 732         onenand_get_device(mtd, FL_READING);
 733
 734         /* TODO handling oob */
 735
 736         while (read < len) {
 737                 thislen = min_t(int, mtd->writesize, len - read);
 738
 739                 column = from & (mtd->writesize - 1);
 740                 if (column + thislen > mtd->writesize)
 741                         thislen = mtd->writesize - column;
 742
 743                 if (!onenand_check_bufferram(mtd, from)) {
 744                         this->command(mtd, ONENAND_CMD_READ, from, mtd->writesize);
 745
 746                         ret = this->wait(mtd, FL_READING);
 747                         /* First copy data and check return value for ECC handling */
 748                         onenand_update_bufferram(mtd, from, 1);
 749                 }
 750
 751                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
 752
 753                 read += thislen;
 754
 755                 if (read == len)
 756                         break;
 757
 758                 if (ret) {
 759                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read: read failed = %d\n", ret);
 760                         goto out;
 761                 }
 762
 763                 from += thislen;
 764                 buf += thislen;
 765         }
 766
 767 out:
 768         /* Deselect and wake up anyone waiting on the device */
 769         onenand_release_device(mtd);
 770
 771         /*
 772          * Return success, if no ECC failures, else -EBADMSG
 773          * fs driver will take care of that, because
 774          * retlen == desired len and result == -EBADMSG
 775          */
 776         *retlen = read;
 777         return ret;
 778 }
 779
 780 /**
 781  * onenand_do_read_oob - [MTD Interface] OneNAND read out-of-band
 782  * @param mtd           MTD device structure
 783  * @param from          offset to read from
 784  * @param len           number of bytes to read
 785  * @param retlen        pointer to variable to store the number of read bytes
 786  * @param buf           the databuffer to put data
 787  *
 788  * OneNAND read out-of-band data from the spare area
 789  */
 790 int onenand_do_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
 791                         size_t *retlen, u_char *buf)
 792 {
 793         struct onenand_chip *this = mtd->priv;
 794         int read = 0, thislen, column;
 795         int ret = 0;
 796
 797         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 798
 799         /* Initialize return length value */
 800         *retlen = 0;
 801
 802         /* Do not allow reads past end of device */
 803         if (unlikely((from + len) > mtd->size)) {
 804                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n");
 805                 return -EINVAL;
 806         }
 807
 808         /* Grab the lock and see if the device is available */
 809         onenand_get_device(mtd, FL_READING);
 810
 811         column = from & (mtd->oobsize - 1);
 812
 813         while (read < len) {
 814                 thislen = mtd->oobsize - column;
 815                 thislen = min_t(int, thislen, len);
 816
 817                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 818
 819                 onenand_update_bufferram(mtd, from, 0);
 820
 821                 ret = this->wait(mtd, FL_READING);
 822                 /* First copy data and check return value for ECC handling */
 823
 824                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 825
 826                 read += thislen;
 827
 828                 if (read == len)
 829                         break;
 830
 831                 if (ret) {
 832                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
 833                         goto out;
 834                 }
 835
 836                 buf += thislen;
 837
 838                 /* Read more? */
 839                 if (read < len) {
 840                         /* Page size */
 841                         from += mtd->writesize;
 842                         column = 0;
 843                 }
 844         }
 845
 846 out:
 847         /* Deselect and wake up anyone waiting on the device */
 848         onenand_release_device(mtd);
 849
 850         *retlen = read;
 851         return ret;
 852 }
 853
 854 /**
 855  * onenand_read_oob - [MTD Interface] NAND write data and/or out-of-band
 856  * @mtd:        MTD device structure
 857  * @from:       offset to read from
 858  * @ops:        oob operation description structure
 859  */
 860 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
 861                             struct mtd_oob_ops *ops)
 862 {
 863         BUG_ON(ops->mode != MTD_OOB_PLACE);
 864
 865         return onenand_do_read_oob(mtd, from + ops->ooboffs, ops->len,
 866                                    &ops->retlen, ops->oobbuf);
 867 }
 868
 869 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
 870 /**
 871  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
 872  * @param mtd           MTD device structure
 873  * @param buf           the databuffer to verify
 874  * @param to            offset to read from
 875  * @param len           number of bytes to read and compare
 876  *
 877  */
 878 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to, int len)
 879 {
 880         struct onenand_chip *this = mtd->priv;
 881         char *readp = this->page_buf;
 882         int column = to & (mtd->oobsize - 1);
 883         int status, i;
 884
 885         this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
 886         onenand_update_bufferram(mtd, to, 0);
 887         status = this->wait(mtd, FL_READING);
 888         if (status)
 889                 return status;
 890
 891         this->read_bufferram(mtd, ONENAND_SPARERAM, readp, column, len);
 892
 893         for(i = 0; i < len; i++)
 894                 if (buf[i] != 0xFF && buf[i] != readp[i])
 895                         return -EBADMSG;
 896
 897         return 0;
 898 }
 899
 900 /**
 901  * onenand_verify_page - [GENERIC] verify the chip contents after a write
 902  * @param mtd           MTD device structure
 903  * @param buf           the databuffer to verify
 904  *
 905  * Check DataRAM area directly
 906  */
 907 static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
 908 {
 909         struct onenand_chip *this = mtd->priv;
 910         void __iomem *dataram0, *dataram1;
 911         int ret = 0;
 912
 913         this->command(mtd, ONENAND_CMD_READ, addr, mtd->writesize);
 914
 915         ret = this->wait(mtd, FL_READING);
 916         if (ret)
 917                 return ret;
 918
 919         onenand_update_bufferram(mtd, addr, 1);
 920
 921         /* Check, if the two dataram areas are same */
 922         dataram0 = this->base + ONENAND_DATARAM;
 923         dataram1 = dataram0 + mtd->writesize;
 924
 925         if (memcmp(dataram0, dataram1, mtd->writesize))
 926                 return -EBADMSG;
 927
 928         return 0;
 929 }
 930 #else
 931 #define onenand_verify_page(...)        (0)
 932 #define onenand_verify_oob(...)         (0)
 933 #endif
 934
 935 #define NOTALIGNED(x)   ((x & (mtd->writesize - 1)) != 0)
 936
 937 /**
 938  * onenand_write - [MTD Interface] write buffer to FLASH
 939  * @param mtd           MTD device structure
 940  * @param to            offset to write to
 941  * @param len           number of bytes to write
 942  * @param retlen        pointer to variable to store the number of written bytes
 943  * @param buf           the data to write
 944  *
 945  * Write with ECC
 946  */
 947 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
 948         size_t *retlen, const u_char *buf)
 949 {
 950         struct onenand_chip *this = mtd->priv;
 951         int written = 0;
 952         int ret = 0;
 953
 954         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 955
 956         /* Initialize retlen, in case of early exit */
 957         *retlen = 0;
 958
 959         /* Do not allow writes past end of device */
 960         if (unlikely((to + len) > mtd->size)) {
 961                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: Attempt write to past end of device\n");
 962                 return -EINVAL;
 963         }
 964
 965         /* Reject writes, which are not page aligned */
 966         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
 967                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: Attempt to write not page aligned data\n");
 968                 return -EINVAL;
 969         }
 970
 971         /* Grab the lock and see if the device is available */
 972         onenand_get_device(mtd, FL_WRITING);
 973
 974         /* Loop until all data write */
 975         while (written < len) {
 976                 int thislen = min_t(int, mtd->writesize, len - written);
 977
 978                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->writesize);
 979
 980                 this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
 981                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 982
 983                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
 984
 985                 onenand_update_bufferram(mtd, to, 1);
 986
 987                 ret = this->wait(mtd, FL_WRITING);
 988                 if (ret) {
 989                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: write filaed %d\n", ret);
 990                         goto out;
 991                 }
 992
 993                 written += thislen;
 994
 995                 /* Only check verify write turn on */
 996                 ret = onenand_verify_page(mtd, (u_char *) buf, to);
 997                 if (ret) {
 998                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write: verify failed %d\n", ret);
 999                         goto out;
1000                 }
1001
1002                 if (written == len)
1003                         break;
1004
1005                 to += thislen;
1006                 buf += thislen;
1007         }
1008
1009 out:
1010         /* Deselect and wake up anyone waiting on the device */
1011         onenand_release_device(mtd);
1012
1013         *retlen = written;
1014
1015         return ret;
1016 }
1017
1018 /**
1019  * onenand_do_write_oob - [Internal] OneNAND write out-of-band
1020  * @param mtd           MTD device structure
1021  * @param to            offset to write to
1022  * @param len           number of bytes to write
1023  * @param retlen        pointer to variable to store the number of written bytes
1024  * @param buf           the data to write
1025  *
1026  * OneNAND write out-of-band
1027  */
1028 static int onenand_do_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
1029                                 size_t *retlen, const u_char *buf)
1030 {
1031         struct onenand_chip *this = mtd->priv;
1032         int column, ret = 0;
1033         int written = 0;
1034
1035         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1036
1037         /* Initialize retlen, in case of early exit */
1038         *retlen = 0;
1039
1040         /* Do not allow writes past end of device */
1041         if (unlikely((to + len) > mtd->size)) {
1042                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n");
1043                 return -EINVAL;
1044         }
1045
1046         /* Grab the lock and see if the device is available */
1047         onenand_get_device(mtd, FL_WRITING);
1048
1049         /* Loop until all data write */
1050         while (written < len) {
1051                 int thislen = min_t(int, mtd->oobsize, len - written);
1052
1053                 column = to & (mtd->oobsize - 1);
1054
1055                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
1056
1057                 /* We send data to spare ram with oobsize
1058                  * to prevent byte access */
1059                 memset(this->page_buf, 0xff, mtd->oobsize);
1060                 memcpy(this->page_buf + column, buf, thislen);
1061                 this->write_bufferram(mtd, ONENAND_SPARERAM, this->page_buf, 0, mtd->oobsize);
1062
1063                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
1064
1065                 onenand_update_bufferram(mtd, to, 0);
1066
1067                 ret = this->wait(mtd, FL_WRITING);
1068                 if (ret) {
1069                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: write filaed %d\n", ret);
1070                         goto out;
1071                 }
1072
1073                 ret = onenand_verify_oob(mtd, buf, to, thislen);
1074                 if (ret) {
1075                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: verify failed %d\n", ret);
1076                         goto out;
1077                 }
1078
1079                 written += thislen;
1080
1081                 if (written == len)
1082                         break;
1083
1084                 to += thislen;
1085                 buf += thislen;
1086         }
1087
1088 out:
1089         /* Deselect and wake up anyone waiting on the device */
1090         onenand_release_device(mtd);
1091
1092         *retlen = written;
1093
1094         return ret;
1095 }
1096
1097 /**
1098  * onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band
1099  * @mtd:        MTD device structure
1100  * @from:       offset to read from
1101  * @ops:        oob operation description structure
1102  */
1103 static int onenand_write_oob(struct mtd_info *mtd, loff_t to,
1104                              struct mtd_oob_ops *ops)
1105 {
1106         BUG_ON(ops->mode != MTD_OOB_PLACE);
1107
1108         return onenand_do_write_oob(mtd, to + ops->ooboffs, ops->len,
1109                                     &ops->retlen, ops->oobbuf);
1110 }
1111
1112 /**
1113  * onenand_block_checkbad - [GENERIC] Check if a block is marked bad
1114  * @param mtd           MTD device structure
1115  * @param ofs           offset from device start
1116  * @param getchip       0, if the chip is already selected
1117  * @param allowbbt      1, if its allowed to access the bbt area
1118  *
1119  * Check, if the block is bad. Either by reading the bad block table or
1120  * calling of the scan function.
1121  */
1122 static int onenand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt)
1123 {
1124         struct onenand_chip *this = mtd->priv;
1125         struct bbm_info *bbm = this->bbm;
1126
1127         /* Return info from the table */
1128         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1129 }
1130
1131 /**
1132  * onenand_erase - [MTD Interface] erase block(s)
1133  * @param mtd           MTD device structure
1134  * @param instr         erase instruction
1135  *
1136  * Erase one ore more blocks
1137  */
1138 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1139 {
1140         struct onenand_chip *this = mtd->priv;
1141         unsigned int block_size;
1142         loff_t addr;
1143         int len;
1144         int ret = 0;
1145
1146         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
1147
1148         block_size = (1 << this->erase_shift);
1149
1150         /* Start address must align on block boundary */
1151         if (unlikely(instr->addr & (block_size - 1))) {
1152                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
1153                 return -EINVAL;
1154         }
1155
1156         /* Length must align on block boundary */
1157         if (unlikely(instr->len & (block_size - 1))) {
1158                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n");
1159                 return -EINVAL;
1160         }
1161
1162         /* Do not allow erase past end of device */
1163         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1164                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n");
1165                 return -EINVAL;
1166         }
1167
1168         instr->fail_addr = 0xffffffff;
1169
1170         /* Grab the lock and see if the device is available */
1171         onenand_get_device(mtd, FL_ERASING);
1172
1173         /* Loop throught the pages */
1174         len = instr->len;
1175         addr = instr->addr;
1176
1177         instr->state = MTD_ERASING;
1178
1179         while (len) {
1180
1181                 /* Check if we have a bad block, we do not erase bad blocks */
1182                 if (onenand_block_checkbad(mtd, addr, 0, 0)) {
1183                         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
1184                         instr->state = MTD_ERASE_FAILED;
1185                         goto erase_exit;
1186                 }
1187
1188                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1189
1190                 ret = this->wait(mtd, FL_ERASING);
1191                 /* Check, if it is write protected */
1192                 if (ret) {
1193                         if (ret == -EPERM)
1194                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
1195                         else
1196                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
1197                         instr->state = MTD_ERASE_FAILED;
1198                         instr->fail_addr = addr;
1199                         goto erase_exit;
1200                 }
1201
1202                 len -= block_size;
1203                 addr += block_size;
1204         }
1205
1206         instr->state = MTD_ERASE_DONE;
1207
1208 erase_exit:
1209
1210         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1211         /* Do call back function */
1212         if (!ret)
1213                 mtd_erase_callback(instr);
1214
1215         /* Deselect and wake up anyone waiting on the device */
1216         onenand_release_device(mtd);
1217
1218         return ret;
1219 }
1220
1221 /**
1222  * onenand_sync - [MTD Interface] sync
1223  * @param mtd           MTD device structure
1224  *
1225  * Sync is actually a wait for chip ready function
1226  */
1227 static void onenand_sync(struct mtd_info *mtd)
1228 {
1229         DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1230
1231         /* Grab the lock and see if the device is available */
1232         onenand_get_device(mtd, FL_SYNCING);
1233
1234         /* Release it and go back */
1235         onenand_release_device(mtd);
1236 }
1237
1238 /**
1239  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1240  * @param mtd           MTD device structure
1241  * @param ofs           offset relative to mtd start
1242  *
1243  * Check whether the block is bad
1244  */
1245 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1246 {
1247         /* Check for invalid offset */
1248         if (ofs > mtd->size)
1249                 return -EINVAL;
1250
1251         return onenand_block_checkbad(mtd, ofs, 1, 0);
1252 }
1253
1254 /**
1255  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1256  * @param mtd           MTD device structure
1257  * @param ofs           offset from device start
1258  *
1259  * This is the default implementation, which can be overridden by
1260  * a hardware specific driver.
1261  */
1262 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1263 {
1264         struct onenand_chip *this = mtd->priv;
1265         struct bbm_info *bbm = this->bbm;
1266         u_char buf[2] = {0, 0};
1267         size_t retlen;
1268         int block;
1269
1270         /* Get block number */
1271         block = ((int) ofs) >> bbm->bbt_erase_shift;
1272         if (bbm->bbt)
1273                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1274
1275         /* We write two bytes, so we dont have to mess with 16 bit access */
1276         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1277         return onenand_do_write_oob(mtd, ofs , 2, &retlen, buf);
1278 }
1279
1280 /**
1281  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1282  * @param mtd           MTD device structure
1283  * @param ofs           offset relative to mtd start
1284  *
1285  * Mark the block as bad
1286  */
1287 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1288 {
1289         struct onenand_chip *this = mtd->priv;
1290         int ret;
1291
1292         ret = onenand_block_isbad(mtd, ofs);
1293         if (ret) {
1294                 /* If it was bad already, return success and do nothing */
1295                 if (ret > 0)
1296                         return 0;
1297                 return ret;
1298         }
1299
1300         return this->block_markbad(mtd, ofs);
1301 }
1302
1303 /**
1304  * onenand_unlock - [MTD Interface] Unlock block(s)
1305  * @param mtd           MTD device structure
1306  * @param ofs           offset relative to mtd start
1307  * @param len           number of bytes to unlock
1308  *
1309  * Unlock one or more blocks
1310  */
1311 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1312 {
1313         struct onenand_chip *this = mtd->priv;
1314         int start, end, block, value, status;
1315
1316         start = ofs >> this->erase_shift;
1317         end = len >> this->erase_shift;
1318
1319         /* Continuous lock scheme */
1320         if (this->options & ONENAND_HAS_CONT_LOCK) {
1321                 /* Set start block address */
1322                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1323                 /* Set end block address */
1324                 this->write_word(start + end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1325                 /* Write unlock command */
1326                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1327
1328                 /* There's no return value */
1329                 this->wait(mtd, FL_UNLOCKING);
1330
1331                 /* Sanity check */
1332                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1333                     & ONENAND_CTRL_ONGO)
1334                         continue;
1335
1336                 /* Check lock status */
1337                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1338                 if (!(status & ONENAND_WP_US))
1339                         printk(KERN_ERR "wp status = 0x%x\n", status);
1340
1341                 return 0;
1342         }
1343
1344         /* Block lock scheme */
1345         for (block = start; block < start + end; block++) {
1346                 /* Set block address */
1347                 value = onenand_block_address(this, block);
1348                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1349                 /* Select DataRAM for DDP */
1350                 value = onenand_bufferram_address(this, block);
1351                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1352                 /* Set start block address */
1353                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1354                 /* Write unlock command */
1355                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1356
1357                 /* There's no return value */
1358                 this->wait(mtd, FL_UNLOCKING);
1359
1360                 /* Sanity check */
1361                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1362                     & ONENAND_CTRL_ONGO)
1363                         continue;
1364
1365                 /* Check lock status */
1366                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1367                 if (!(status & ONENAND_WP_US))
1368                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1369         }
1370
1371         return 0;
1372 }
1373
1374 /**
1375  * onenand_check_lock_status - [OneNAND Interface] Check lock status
1376  * @param this          onenand chip data structure
1377  *
1378  * Check lock status
1379  */
1380 static void onenand_check_lock_status(struct onenand_chip *this)
1381 {
1382         unsigned int value, block, status;
1383         unsigned int end;
1384
1385         end = this->chipsize >> this->erase_shift;
1386         for (block = 0; block < end; block++) {
1387                 /* Set block address */
1388                 value = onenand_block_address(this, block);
1389                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1390                 /* Select DataRAM for DDP */
1391                 value = onenand_bufferram_address(this, block);
1392                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1393                 /* Set start block address */
1394                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1395
1396                 /* Check lock status */
1397                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1398                 if (!(status & ONENAND_WP_US))
1399                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1400         }
1401 }
1402
1403 /**
1404  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
1405  * @param mtd           MTD device structure
1406  *
1407  * Unlock all blocks
1408  */
1409 static int onenand_unlock_all(struct mtd_info *mtd)
1410 {
1411         struct onenand_chip *this = mtd->priv;
1412
1413         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
1414                 /* Write unlock command */
1415                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
1416
1417                 /* There's no return value */
1418                 this->wait(mtd, FL_UNLOCKING);
1419
1420                 /* Sanity check */
1421                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1422                     & ONENAND_CTRL_ONGO)
1423                         continue;
1424
1425                 /* Workaround for all block unlock in DDP */
1426                 if (this->device_id & ONENAND_DEVICE_IS_DDP) {
1427                         loff_t ofs;
1428                         size_t len;
1429
1430                         /* 1st block on another chip */
1431                         ofs = this->chipsize >> 1;
1432                         len = 1 << this->erase_shift;
1433
1434                         onenand_unlock(mtd, ofs, len);
1435                 }
1436
1437                 onenand_check_lock_status(this);
1438
1439                 return 0;
1440         }
1441
1442         mtd->unlock(mtd, 0x0, this->chipsize);
1443
1444         return 0;
1445 }
1446
1447 #ifdef CONFIG_MTD_ONENAND_OTP
1448
1449 /* Interal OTP operation */
1450 typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
1451                 size_t *retlen, u_char *buf);
1452
1453 /**
1454  * do_otp_read - [DEFAULT] Read OTP block area
1455  * @param mtd           MTD device structure
1456  * @param from          The offset to read
1457  * @param len           number of bytes to read
1458  * @param retlen        pointer to variable to store the number of readbytes
1459  * @param buf           the databuffer to put/get data
1460  *
1461  * Read OTP block area.
1462  */
1463 static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
1464                 size_t *retlen, u_char *buf)
1465 {
1466         struct onenand_chip *this = mtd->priv;
1467         int ret;
1468
1469         /* Enter OTP access mode */
1470         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
1471         this->wait(mtd, FL_OTPING);
1472
1473         ret = mtd->read(mtd, from, len, retlen, buf);
1474
1475         /* Exit OTP access mode */
1476         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
1477         this->wait(mtd, FL_RESETING);
1478
1479         return ret;
1480 }
1481
1482 /**
1483  * do_otp_write - [DEFAULT] Write OTP block area
1484  * @param mtd           MTD device structure
1485  * @param from          The offset to write
1486  * @param len           number of bytes to write
1487  * @param retlen        pointer to variable to store the number of write bytes
1488  * @param buf           the databuffer to put/get data
1489  *
1490  * Write OTP block area.
1491  */
1492 static int do_otp_write(struct mtd_info *mtd, loff_t from, size_t len,
1493                 size_t *retlen, u_char *buf)
1494 {
1495         struct onenand_chip *this = mtd->priv;
1496         unsigned char *pbuf = buf;
1497         int ret;
1498
1499         /* Force buffer page aligned */
1500         if (len < mtd->writesize) {
1501                 memcpy(this->page_buf, buf, len);
1502                 memset(this->page_buf + len, 0xff, mtd->writesize - len);
1503                 pbuf = this->page_buf;
1504                 len = mtd->writesize;
1505         }
1506
1507         /* Enter OTP access mode */
1508         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
1509         this->wait(mtd, FL_OTPING);
1510
1511         ret = mtd->write(mtd, from, len, retlen, pbuf);
1512
1513         /* Exit OTP access mode */
1514         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
1515         this->wait(mtd, FL_RESETING);
1516
1517         return ret;
1518 }
1519
1520 /**
1521  * do_otp_lock - [DEFAULT] Lock OTP block area
1522  * @param mtd           MTD device structure
1523  * @param from          The offset to lock
1524  * @param len           number of bytes to lock
1525  * @param retlen        pointer to variable to store the number of lock bytes
1526  * @param buf           the databuffer to put/get data
1527  *
1528  * Lock OTP block area.
1529  */
1530 static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
1531                 size_t *retlen, u_char *buf)
1532 {
1533         struct onenand_chip *this = mtd->priv;
1534         int ret;
1535
1536         /* Enter OTP access mode */
1537         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
1538         this->wait(mtd, FL_OTPING);
1539
1540         ret = onenand_do_write_oob(mtd, from, len, retlen, buf);
1541
1542         /* Exit OTP access mode */
1543         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
1544         this->wait(mtd, FL_RESETING);
1545
1546         return ret;
1547 }
1548
1549 /**
1550  * onenand_otp_walk - [DEFAULT] Handle OTP operation
1551  * @param mtd           MTD device structure
1552  * @param from          The offset to read/write
1553  * @param len           number of bytes to read/write
1554  * @param retlen        pointer to variable to store the number of read bytes
1555  * @param buf           the databuffer to put/get data
1556  * @param action        do given action
1557  * @param mode          specify user and factory
1558  *
1559  * Handle OTP operation.
1560  */
1561 static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
1562                         size_t *retlen, u_char *buf,
1563                         otp_op_t action, int mode)
1564 {
1565         struct onenand_chip *this = mtd->priv;
1566         int otp_pages;
1567         int density;
1568         int ret = 0;
1569
1570         *retlen = 0;
1571
1572         density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1573         if (density < ONENAND_DEVICE_DENSITY_512Mb)
1574                 otp_pages = 20;
1575         else
1576                 otp_pages = 10;
1577
1578         if (mode == MTD_OTP_FACTORY) {
1579                 from += mtd->writesize * otp_pages;
1580                 otp_pages = 64 - otp_pages;
1581         }
1582
1583         /* Check User/Factory boundary */
1584         if (((mtd->writesize * otp_pages) - (from + len)) < 0)
1585                 return 0;
1586
1587         while (len > 0 && otp_pages > 0) {
1588                 if (!action) {  /* OTP Info functions */
1589                         struct otp_info *otpinfo;
1590
1591                         len -= sizeof(struct otp_info);
1592                         if (len <= 0)
1593                                 return -ENOSPC;
1594
1595                         otpinfo = (struct otp_info *) buf;
1596                         otpinfo->start = from;
1597                         otpinfo->length = mtd->writesize;
1598                         otpinfo->locked = 0;
1599
1600                         from += mtd->writesize;
1601                         buf += sizeof(struct otp_info);
1602                         *retlen += sizeof(struct otp_info);
1603                 } else {
1604                         size_t tmp_retlen;
1605                         int size = len;
1606
1607                         ret = action(mtd, from, len, &tmp_retlen, buf);
1608
1609                         buf += size;
1610                         len -= size;
1611                         *retlen += size;
1612
1613                         if (ret < 0)
1614                                 return ret;
1615                 }
1616                 otp_pages--;
1617         }
1618
1619         return 0;
1620 }
1621
1622 /**
1623  * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
1624  * @param mtd           MTD device structure
1625  * @param buf           the databuffer to put/get data
1626  * @param len           number of bytes to read
1627  *
1628  * Read factory OTP info.
1629  */
1630 static int onenand_get_fact_prot_info(struct mtd_info *mtd,
1631                         struct otp_info *buf, size_t len)
1632 {
1633         size_t retlen;
1634         int ret;
1635
1636         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);
1637
1638         return ret ? : retlen;
1639 }
1640
1641 /**
1642  * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
1643  * @param mtd           MTD device structure
1644  * @param from          The offset to read
1645  * @param len           number of bytes to read
1646  * @param retlen        pointer to variable to store the number of read bytes
1647  * @param buf           the databuffer to put/get data
1648  *
1649  * Read factory OTP area.
1650  */
1651 static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
1652                         size_t len, size_t *retlen, u_char *buf)
1653 {
1654         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
1655 }
1656
1657 /**
1658  * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
1659  * @param mtd           MTD device structure
1660  * @param buf           the databuffer to put/get data
1661  * @param len           number of bytes to read
1662  *
1663  * Read user OTP info.
1664  */
1665 static int onenand_get_user_prot_info(struct mtd_info *mtd,
1666                         struct otp_info *buf, size_t len)
1667 {
1668         size_t retlen;
1669         int ret;
1670
1671         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);
1672
1673         return ret ? : retlen;
1674 }
1675
1676 /**
1677  * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
1678  * @param mtd           MTD device structure
1679  * @param from          The offset to read
1680  * @param len           number of bytes to read
1681  * @param retlen        pointer to variable to store the number of read bytes
1682  * @param buf           the databuffer to put/get data
1683  *
1684  * Read user OTP area.
1685  */
1686 static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
1687                         size_t len, size_t *retlen, u_char *buf)
1688 {
1689         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
1690 }
1691
1692 /**
1693  * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
1694  * @param mtd           MTD device structure
1695  * @param from          The offset to write
1696  * @param len           number of bytes to write
1697  * @param retlen        pointer to variable to store the number of write bytes
1698  * @param buf           the databuffer to put/get data
1699  *
1700  * Write user OTP area.
1701  */
1702 static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
1703                         size_t len, size_t *retlen, u_char *buf)
1704 {
1705         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
1706 }
1707
1708 /**
1709  * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
1710  * @param mtd           MTD device structure
1711  * @param from          The offset to lock
1712  * @param len           number of bytes to unlock
1713  *
1714  * Write lock mark on spare area in page 0 in OTP block
1715  */
1716 static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
1717                         size_t len)
1718 {
1719         unsigned char oob_buf[64];
1720         size_t retlen;
1721         int ret;
1722
1723         memset(oob_buf, 0xff, mtd->oobsize);
1724         /*
1725          * Note: OTP lock operation
1726          *       OTP block : 0xXXFC
1727          *       1st block : 0xXXF3 (If chip support)
1728          *       Both      : 0xXXF0 (If chip support)
1729          */
1730         oob_buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
1731
1732         /*
1733          * Write lock mark to 8th word of sector0 of page0 of the spare0.
1734          * We write 16 bytes spare area instead of 2 bytes.
1735          */
1736         from = 0;
1737         len = 16;
1738
1739         ret = onenand_otp_walk(mtd, from, len, &retlen, oob_buf, do_otp_lock, MTD_OTP_USER);
1740
1741         return ret ? : retlen;
1742 }
1743 #endif  /* CONFIG_MTD_ONENAND_OTP */
1744
1745 /**
1746  * onenand_lock_scheme - Check and set OneNAND lock scheme
1747  * @param mtd           MTD data structure
1748  *
1749  * Check and set OneNAND lock scheme
1750  */
1751 static void onenand_lock_scheme(struct mtd_info *mtd)
1752 {
1753         struct onenand_chip *this = mtd->priv;
1754         unsigned int density, process;
1755
1756         /* Lock scheme depends on density and process */
1757         density = this->device_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1758         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
1759
1760         /* Lock scheme */
1761         if (density >= ONENAND_DEVICE_DENSITY_1Gb) {
1762                 /* A-Die has all block unlock */
1763                 if (process) {
1764                         printk(KERN_DEBUG "Chip support all block unlock\n");
1765                         this->options |= ONENAND_HAS_UNLOCK_ALL;
1766                 }
1767         } else {
1768                 /* Some OneNAND has continues lock scheme */
1769                 if (!process) {
1770                         printk(KERN_DEBUG "Lock scheme is Continues Lock\n");
1771                         this->options |= ONENAND_HAS_CONT_LOCK;
1772                 }
1773         }
1774 }
1775
1776 /**
1777  * onenand_print_device_info - Print device ID
1778  * @param device        device ID
1779  *
1780  * Print device ID
1781  */
1782 static void onenand_print_device_info(int device, int version)
1783 {
1784         int vcc, demuxed, ddp, density;
1785
1786         vcc = device & ONENAND_DEVICE_VCC_MASK;
1787         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
1788         ddp = device & ONENAND_DEVICE_IS_DDP;
1789         density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
1790         printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
1791                 demuxed ? "" : "Muxed ",
1792                 ddp ? "(DDP)" : "",
1793                 (16 << density),
1794                 vcc ? "2.65/3.3" : "1.8",
1795                 device);
1796         printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version);
1797 }
1798
1799 static const struct onenand_manufacturers onenand_manuf_ids[] = {
1800         {ONENAND_MFR_SAMSUNG, "Samsung"},
1801 };
1802
1803 /**
1804  * onenand_check_maf - Check manufacturer ID
1805  * @param manuf         manufacturer ID
1806  *
1807  * Check manufacturer ID
1808  */
1809 static int onenand_check_maf(int manuf)
1810 {
1811         int size = ARRAY_SIZE(onenand_manuf_ids);
1812         char *name;
1813         int i;
1814
1815         for (i = 0; i < size; i++)
1816                 if (manuf == onenand_manuf_ids[i].id)
1817                         break;
1818
1819         if (i < size)
1820                 name = onenand_manuf_ids[i].name;
1821         else
1822                 name = "Unknown";
1823
1824         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
1825
1826         return (i == size);
1827 }
1828
1829 /**
1830  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
1831  * @param mtd           MTD device structure
1832  *
1833  * OneNAND detection method:
1834  *   Compare the the values from command with ones from register
1835  */
1836 static int onenand_probe(struct mtd_info *mtd)
1837 {
1838         struct onenand_chip *this = mtd->priv;
1839         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
1840         int density;
1841         int syscfg;
1842
1843         /* Save system configuration 1 */
1844         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
1845         /* Clear Sync. Burst Read mode to read BootRAM */
1846         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);
1847
1848         /* Send the command for reading device ID from BootRAM */
1849         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
1850
1851         /* Read manufacturer and device IDs from BootRAM */
1852         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
1853         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
1854
1855         /* Reset OneNAND to read default register values */
1856         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
1857         /* Wait reset */
1858         this->wait(mtd, FL_RESETING);
1859
1860         /* Restore system configuration 1 */
1861         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
1862
1863         /* Check manufacturer ID */
1864         if (onenand_check_maf(bram_maf_id))
1865                 return -ENXIO;
1866
1867         /* Read manufacturer and device IDs from Register */
1868         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
1869         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
1870         ver_id= this->read_word(this->base + ONENAND_REG_VERSION_ID);
1871
1872         /* Check OneNAND device */
1873         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
1874                 return -ENXIO;
1875
1876         /* Flash device information */
1877         onenand_print_device_info(dev_id, ver_id);
1878         this->device_id = dev_id;
1879         this->version_id = ver_id;
1880
1881         density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1882         this->chipsize = (16 << density) << 20;
1883         /* Set density mask. it is used for DDP */
1884         this->density_mask = (1 << (density + 6));
1885
1886         /* OneNAND page size & block size */
1887         /* The data buffer size is equal to page size */
1888         mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
1889         mtd->oobsize = mtd->writesize >> 5;
1890         /* Pagers per block is always 64 in OneNAND */
1891         mtd->erasesize = mtd->writesize << 6;
1892
1893         this->erase_shift = ffs(mtd->erasesize) - 1;
1894         this->page_shift = ffs(mtd->writesize) - 1;
1895         this->ppb_shift = (this->erase_shift - this->page_shift);
1896         this->page_mask = (mtd->erasesize / mtd->writesize) - 1;
1897
1898         /* REVIST: Multichip handling */
1899
1900         mtd->size = this->chipsize;
1901
1902         /* Check OneNAND lock scheme */
1903         onenand_lock_scheme(mtd);
1904
1905         return 0;
1906 }
1907
1908 /**
1909  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
1910  * @param mtd           MTD device structure
1911  */
1912 static int onenand_suspend(struct mtd_info *mtd)
1913 {
1914         return onenand_get_device(mtd, FL_PM_SUSPENDED);
1915 }
1916
1917 /**
1918  * onenand_resume - [MTD Interface] Resume the OneNAND flash
1919  * @param mtd           MTD device structure
1920  */
1921 static void onenand_resume(struct mtd_info *mtd)
1922 {
1923         struct onenand_chip *this = mtd->priv;
1924
1925         if (this->state == FL_PM_SUSPENDED)
1926                 onenand_release_device(mtd);
1927         else
1928                 printk(KERN_ERR "resume() called for the chip which is not"
1929                                 "in suspended state\n");
1930 }
1931
1932 /**
1933  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
1934  * @param mtd           MTD device structure
1935  * @param maxchips      Number of chips to scan for
1936  *
1937  * This fills out all the not initialized function pointers
1938  * with the defaults.
1939  * The flash ID is read and the mtd/chip structures are
1940  * filled with the appropriate values.
1941  */
1942 int onenand_scan(struct mtd_info *mtd, int maxchips)
1943 {
1944         struct onenand_chip *this = mtd->priv;
1945
1946         if (!this->read_word)
1947                 this->read_word = onenand_readw;
1948         if (!this->write_word)
1949                 this->write_word = onenand_writew;
1950
1951         if (!this->command)
1952                 this->command = onenand_command;
1953         if (!this->wait)
1954                 onenand_setup_wait(mtd);
1955
1956         if (!this->read_bufferram)
1957                 this->read_bufferram = onenand_read_bufferram;
1958         if (!this->write_bufferram)
1959                 this->write_bufferram = onenand_write_bufferram;
1960
1961         if (!this->block_markbad)
1962                 this->block_markbad = onenand_default_block_markbad;
1963         if (!this->scan_bbt)
1964                 this->scan_bbt = onenand_default_bbt;
1965
1966         if (onenand_probe(mtd))
1967                 return -ENXIO;
1968
1969         /* Set Sync. Burst Read after probing */
1970         if (this->mmcontrol) {
1971                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
1972                 this->read_bufferram = onenand_sync_read_bufferram;
1973         }
1974
1975         /* Allocate buffers, if necessary */
1976         if (!this->page_buf) {
1977                 size_t len;
1978                 len = mtd->writesize + mtd->oobsize;
1979                 this->page_buf = kmalloc(len, GFP_KERNEL);
1980                 if (!this->page_buf) {
1981                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
1982                         return -ENOMEM;
1983                 }
1984                 this->options |= ONENAND_PAGEBUF_ALLOC;
1985         }
1986
1987         this->state = FL_READY;
1988         init_waitqueue_head(&this->wq);
1989         spin_lock_init(&this->chip_lock);
1990
1991         switch (mtd->oobsize) {
1992         case 64:
1993                 this->ecclayout = &onenand_oob_64;
1994                 break;
1995
1996         case 32:
1997                 this->ecclayout = &onenand_oob_32;
1998                 break;
1999
2000         default:
2001                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
2002                         mtd->oobsize);
2003                 /* To prevent kernel oops */
2004                 this->ecclayout = &onenand_oob_32;
2005                 break;
2006         }
2007
2008         mtd->ecclayout = this->ecclayout;
2009
2010         /* Fill in remaining MTD driver data */
2011         mtd->type = MTD_NANDFLASH;
2012         mtd->flags = MTD_CAP_NANDFLASH;
2013         mtd->ecctype = MTD_ECC_SW;
2014         mtd->erase = onenand_erase;
2015         mtd->point = NULL;
2016         mtd->unpoint = NULL;
2017         mtd->read = onenand_read;
2018         mtd->write = onenand_write;
2019         mtd->read_oob = onenand_read_oob;
2020         mtd->write_oob = onenand_write_oob;
2021 #ifdef CONFIG_MTD_ONENAND_OTP
2022         mtd->get_fact_prot_info = onenand_get_fact_prot_info;
2023         mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;
2024         mtd->get_user_prot_info = onenand_get_user_prot_info;
2025         mtd->read_user_prot_reg = onenand_read_user_prot_reg;
2026         mtd->write_user_prot_reg = onenand_write_user_prot_reg;
2027         mtd->lock_user_prot_reg = onenand_lock_user_prot_reg;
2028 #endif
2029         mtd->sync = onenand_sync;
2030         mtd->lock = NULL;
2031         mtd->unlock = onenand_unlock;
2032         mtd->suspend = onenand_suspend;
2033         mtd->resume = onenand_resume;
2034         mtd->block_isbad = onenand_block_isbad;
2035         mtd->block_markbad = onenand_block_markbad;
2036         mtd->owner = THIS_MODULE;
2037
2038         /* Unlock whole block */
2039         onenand_unlock_all(mtd);
2040
2041         return this->scan_bbt(mtd);
2042 }
2043
2044 /**
2045  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
2046  * @param mtd           MTD device structure
2047  */
2048 void onenand_release(struct mtd_info *mtd)
2049 {
2050         struct onenand_chip *this = mtd->priv;
2051
2052 #ifdef CONFIG_MTD_PARTITIONS
2053         /* Deregister partitions */
2054         del_mtd_partitions (mtd);
2055 #endif
2056         /* Deregister the device */
2057         del_mtd_device (mtd);
2058
2059         /* Free bad block table memory, if allocated */
2060         if (this->bbm)
2061                 kfree(this->bbm);
2062         /* Buffer allocated by onenand_scan */
2063         if (this->options & ONENAND_PAGEBUF_ALLOC)
2064                 kfree(this->page_buf);
2065 }
2066
2067 EXPORT_SYMBOL_GPL(onenand_scan);
2068 EXPORT_SYMBOL_GPL(onenand_release);
2069
2070 MODULE_LICENSE("GPL");
2071 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
2072 MODULE_DESCRIPTION("Generic OneNAND flash driver code");