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