drivers/mtd/onenand/onenand_base.c

   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright (C) 2005 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_oobinfo onenand_oob_64 = {
  27         .useecc         = MTD_NANDECC_AUTOPLACE,
  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                 {24, 3}, {46, 2}, {40, 3}, {62, 2} }
  38 };
  39
  40 /**
  41  * onenand_oob_32 - oob info for middle (1KB) page
  42  */
  43 static struct nand_oobinfo onenand_oob_32 = {
  44         .useecc         = MTD_NANDECC_AUTOPLACE,
  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;
 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                 block = -1;
 204                 page = -1;
 205                 break;
 206
 207         case ONENAND_CMD_ERASE:
 208         case ONENAND_CMD_BUFFERRAM:
 209                 block = (int) (addr >> this->erase_shift);
 210                 page = -1;
 211                 break;
 212
 213         default:
 214                 block = (int) (addr >> this->erase_shift);
 215                 page = (int) (addr >> this->page_shift);
 216                 page &= this->page_mask;
 217                 break;
 218         }
 219
 220         /* NOTE: The setting order of the registers is very important! */
 221         if (cmd == ONENAND_CMD_BUFFERRAM) {
 222                 /* Select DataRAM for DDP */
 223                 value = onenand_bufferram_address(this, block);
 224                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 225
 226                 /* Switch to the next data buffer */
 227                 ONENAND_SET_NEXT_BUFFERRAM(this);
 228
 229                 return 0;
 230         }
 231
 232         if (block != -1) {
 233                 /* Write 'DFS, FBA' of Flash */
 234                 value = onenand_block_address(this, block);
 235                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 236         }
 237
 238         if (page != -1) {
 239                 int dataram;
 240
 241                 switch (cmd) {
 242                 case ONENAND_CMD_READ:
 243                 case ONENAND_CMD_READOOB:
 244                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 245                         readcmd = 1;
 246                         break;
 247
 248                 default:
 249                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 250                         break;
 251                 }
 252
 253                 /* Write 'FPA, FSA' of Flash */
 254                 value = onenand_page_address(page, sectors);
 255                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 256
 257                 /* Write 'BSA, BSC' of DataRAM */
 258                 value = onenand_buffer_address(dataram, sectors, count);
 259                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 260
 261                 if (readcmd) {
 262                         /* Select DataRAM for DDP */
 263                         value = onenand_bufferram_address(this, block);
 264                         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 265                 }
 266         }
 267
 268         /* Interrupt clear */
 269         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 270
 271         /* Write command */
 272         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 273
 274         return 0;
 275 }
 276
 277 /**
 278  * onenand_wait - [DEFAULT] wait until the command is done
 279  * @param mtd           MTD device structure
 280  * @param state         state to select the max. timeout value
 281  *
 282  * Wait for command done. This applies to all OneNAND command
 283  * Read can take up to 30us, erase up to 2ms and program up to 350us
 284  * according to general OneNAND specs
 285  */
 286 static int onenand_wait(struct mtd_info *mtd, int state)
 287 {
 288         struct onenand_chip * this = mtd->priv;
 289         unsigned long timeout;
 290         unsigned int flags = ONENAND_INT_MASTER;
 291         unsigned int interrupt = 0;
 292         unsigned int ctrl, ecc;
 293
 294         /* The 20 msec is enough */
 295         timeout = jiffies + msecs_to_jiffies(20);
 296         while (time_before(jiffies, timeout)) {
 297                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 298
 299                 if (interrupt & flags)
 300                         break;
 301
 302                 if (state != FL_READING)
 303                         cond_resched();
 304                 touch_softlockup_watchdog();
 305         }
 306         /* To get correct interrupt status in timeout case */
 307         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 308
 309         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 310
 311         if (ctrl & ONENAND_CTRL_ERROR) {
 312                 /* It maybe occur at initial bad block */
 313                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
 314                 /* Clear other interrupt bits for preventing ECC error */
 315                 interrupt &= ONENAND_INT_MASTER;
 316         }
 317
 318         if (ctrl & ONENAND_CTRL_LOCK) {
 319                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
 320                 return -EACCES;
 321         }
 322
 323         if (interrupt & ONENAND_INT_READ) {
 324                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 325                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 326                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
 327                         return -EBADMSG;
 328                 }
 329         }
 330
 331         return 0;
 332 }
 333
 334 /**
 335  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 336  * @param mtd           MTD data structure
 337  * @param area          BufferRAM area
 338  * @return              offset given area
 339  *
 340  * Return BufferRAM offset given area
 341  */
 342 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 343 {
 344         struct onenand_chip *this = mtd->priv;
 345
 346         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 347                 if (area == ONENAND_DATARAM)
 348                         return mtd->oobblock;
 349                 if (area == ONENAND_SPARERAM)
 350                         return mtd->oobsize;
 351         }
 352
 353         return 0;
 354 }
 355
 356 /**
 357  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 358  * @param mtd           MTD data structure
 359  * @param area          BufferRAM area
 360  * @param buffer        the databuffer to put/get data
 361  * @param offset        offset to read from or write to
 362  * @param count         number of bytes to read/write
 363  *
 364  * Read the BufferRAM area
 365  */
 366 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 367                 unsigned char *buffer, int offset, size_t count)
 368 {
 369         struct onenand_chip *this = mtd->priv;
 370         void __iomem *bufferram;
 371
 372         bufferram = this->base + area;
 373
 374         bufferram += onenand_bufferram_offset(mtd, area);
 375
 376         memcpy(buffer, bufferram + offset, count);
 377
 378         return 0;
 379 }
 380
 381 /**
 382  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 383  * @param mtd           MTD data structure
 384  * @param area          BufferRAM area
 385  * @param buffer        the databuffer to put/get data
 386  * @param offset        offset to read from or write to
 387  * @param count         number of bytes to read/write
 388  *
 389  * Read the BufferRAM area with Sync. Burst Mode
 390  */
 391 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 392                 unsigned char *buffer, int offset, size_t count)
 393 {
 394         struct onenand_chip *this = mtd->priv;
 395         void __iomem *bufferram;
 396
 397         bufferram = this->base + area;
 398
 399         bufferram += onenand_bufferram_offset(mtd, area);
 400
 401         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 402
 403         memcpy(buffer, bufferram + offset, count);
 404
 405         this->mmcontrol(mtd, 0);
 406
 407         return 0;
 408 }
 409
 410 /**
 411  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 412  * @param mtd           MTD data structure
 413  * @param area          BufferRAM area
 414  * @param buffer        the databuffer to put/get data
 415  * @param offset        offset to read from or write to
 416  * @param count         number of bytes to read/write
 417  *
 418  * Write the BufferRAM area
 419  */
 420 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 421                 const unsigned char *buffer, int offset, size_t count)
 422 {
 423         struct onenand_chip *this = mtd->priv;
 424         void __iomem *bufferram;
 425
 426         bufferram = this->base + area;
 427
 428         bufferram += onenand_bufferram_offset(mtd, area);
 429
 430         memcpy(bufferram + offset, buffer, count);
 431
 432         return 0;
 433 }
 434
 435 /**
 436  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 437  * @param mtd           MTD data structure
 438  * @param addr          address to check
 439  * @return              1 if there are valid data, otherwise 0
 440  *
 441  * Check bufferram if there is data we required
 442  */
 443 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 444 {
 445         struct onenand_chip *this = mtd->priv;
 446         int block, page;
 447         int i;
 448
 449         block = (int) (addr >> this->erase_shift);
 450         page = (int) (addr >> this->page_shift);
 451         page &= this->page_mask;
 452
 453         i = ONENAND_CURRENT_BUFFERRAM(this);
 454
 455         /* Is there valid data? */
 456         if (this->bufferram[i].block == block &&
 457             this->bufferram[i].page == page &&
 458             this->bufferram[i].valid)
 459                 return 1;
 460
 461         return 0;
 462 }
 463
 464 /**
 465  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 466  * @param mtd           MTD data structure
 467  * @param addr          address to update
 468  * @param valid         valid flag
 469  *
 470  * Update BufferRAM information
 471  */
 472 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 473                 int valid)
 474 {
 475         struct onenand_chip *this = mtd->priv;
 476         int block, page;
 477         int i;
 478
 479         block = (int) (addr >> this->erase_shift);
 480         page = (int) (addr >> this->page_shift);
 481         page &= this->page_mask;
 482
 483         /* Invalidate BufferRAM */
 484         for (i = 0; i < MAX_BUFFERRAM; i++) {
 485                 if (this->bufferram[i].block == block &&
 486                     this->bufferram[i].page == page)
 487                         this->bufferram[i].valid = 0;
 488         }
 489
 490         /* Update BufferRAM */
 491         i = ONENAND_CURRENT_BUFFERRAM(this);
 492         this->bufferram[i].block = block;
 493         this->bufferram[i].page = page;
 494         this->bufferram[i].valid = valid;
 495
 496         return 0;
 497 }
 498
 499 /**
 500  * onenand_get_device - [GENERIC] Get chip for selected access
 501  * @param mtd           MTD device structure
 502  * @param new_state     the state which is requested
 503  *
 504  * Get the device and lock it for exclusive access
 505  */
 506 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 507 {
 508         struct onenand_chip *this = mtd->priv;
 509         DECLARE_WAITQUEUE(wait, current);
 510
 511         /*
 512          * Grab the lock and see if the device is available
 513          */
 514         while (1) {
 515                 spin_lock(&this->chip_lock);
 516                 if (this->state == FL_READY) {
 517                         this->state = new_state;
 518                         spin_unlock(&this->chip_lock);
 519                         break;
 520                 }
 521                 if (new_state == FL_PM_SUSPENDED) {
 522                         spin_unlock(&this->chip_lock);
 523                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 524                 }
 525                 set_current_state(TASK_UNINTERRUPTIBLE);
 526                 add_wait_queue(&this->wq, &wait);
 527                 spin_unlock(&this->chip_lock);
 528                 schedule();
 529                 remove_wait_queue(&this->wq, &wait);
 530         }
 531
 532         return 0;
 533 }
 534
 535 /**
 536  * onenand_release_device - [GENERIC] release chip
 537  * @param mtd           MTD device structure
 538  *
 539  * Deselect, release chip lock and wake up anyone waiting on the device
 540  */
 541 static void onenand_release_device(struct mtd_info *mtd)
 542 {
 543         struct onenand_chip *this = mtd->priv;
 544
 545         /* Release the chip */
 546         spin_lock(&this->chip_lock);
 547         this->state = FL_READY;
 548         wake_up(&this->wq);
 549         spin_unlock(&this->chip_lock);
 550 }
 551
 552 /**
 553  * onenand_read_ecc - [MTD Interface] Read data with ECC
 554  * @param mtd           MTD device structure
 555  * @param from          offset to read from
 556  * @param len           number of bytes to read
 557  * @param retlen        pointer to variable to store the number of read bytes
 558  * @param buf           the databuffer to put data
 559  * @param oob_buf       filesystem supplied oob data buffer
 560  * @param oobsel        oob selection structure
 561  *
 562  * OneNAND read with ECC
 563  */
 564 static int onenand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
 565         size_t *retlen, u_char *buf,
 566         u_char *oob_buf, struct nand_oobinfo *oobsel)
 567 {
 568         struct onenand_chip *this = mtd->priv;
 569         int read = 0, column;
 570         int thislen;
 571         int ret = 0;
 572
 573         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 574
 575         /* Do not allow reads past end of device */
 576         if ((from + len) > mtd->size) {
 577                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: Attempt read beyond end of device\n");
 578                 *retlen = 0;
 579                 return -EINVAL;
 580         }
 581
 582         /* Grab the lock and see if the device is available */
 583         onenand_get_device(mtd, FL_READING);
 584
 585         /* TODO handling oob */
 586
 587         while (read < len) {
 588                 thislen = min_t(int, mtd->oobblock, len - read);
 589
 590                 column = from & (mtd->oobblock - 1);
 591                 if (column + thislen > mtd->oobblock)
 592                         thislen = mtd->oobblock - column;
 593
 594                 if (!onenand_check_bufferram(mtd, from)) {
 595                         this->command(mtd, ONENAND_CMD_READ, from, mtd->oobblock);
 596
 597                         ret = this->wait(mtd, FL_READING);
 598                         /* First copy data and check return value for ECC handling */
 599                         onenand_update_bufferram(mtd, from, 1);
 600                 }
 601
 602                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
 603
 604                 read += thislen;
 605
 606                 if (read == len)
 607                         break;
 608
 609                 if (ret) {
 610                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: read failed = %d\n", ret);
 611                         goto out;
 612                 }
 613
 614                 from += thislen;
 615                 buf += thislen;
 616         }
 617
 618 out:
 619         /* Deselect and wake up anyone waiting on the device */
 620         onenand_release_device(mtd);
 621
 622         /*
 623          * Return success, if no ECC failures, else -EBADMSG
 624          * fs driver will take care of that, because
 625          * retlen == desired len and result == -EBADMSG
 626          */
 627         *retlen = read;
 628         return ret;
 629 }
 630
 631 /**
 632  * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
 633  * @param mtd           MTD device structure
 634  * @param from          offset to read from
 635  * @param len           number of bytes to read
 636  * @param retlen        pointer to variable to store the number of read bytes
 637  * @param buf           the databuffer to put data
 638  *
 639  * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
 640 */
 641 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 642         size_t *retlen, u_char *buf)
 643 {
 644         return onenand_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
 645 }
 646
 647 /**
 648  * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
 649  * @param mtd           MTD device structure
 650  * @param from          offset to read from
 651  * @param len           number of bytes to read
 652  * @param retlen        pointer to variable to store the number of read bytes
 653  * @param buf           the databuffer to put data
 654  *
 655  * OneNAND read out-of-band data from the spare area
 656  */
 657 static int onenand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
 658         size_t *retlen, u_char *buf)
 659 {
 660         struct onenand_chip *this = mtd->priv;
 661         int read = 0, thislen, column;
 662         int ret = 0;
 663
 664         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 665
 666         /* Initialize return length value */
 667         *retlen = 0;
 668
 669         /* Do not allow reads past end of device */
 670         if (unlikely((from + len) > mtd->size)) {
 671                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n");
 672                 return -EINVAL;
 673         }
 674
 675         /* Grab the lock and see if the device is available */
 676         onenand_get_device(mtd, FL_READING);
 677
 678         column = from & (mtd->oobsize - 1);
 679
 680         while (read < len) {
 681                 thislen = mtd->oobsize - column;
 682                 thislen = min_t(int, thislen, len);
 683
 684                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 685
 686                 onenand_update_bufferram(mtd, from, 0);
 687
 688                 ret = this->wait(mtd, FL_READING);
 689                 /* First copy data and check return value for ECC handling */
 690
 691                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 692
 693                 read += thislen;
 694
 695                 if (read == len)
 696                         break;
 697
 698                 if (ret) {
 699                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
 700                         goto out;
 701                 }
 702
 703                 buf += thislen;
 704
 705                 /* Read more? */
 706                 if (read < len) {
 707                         /* Page size */
 708                         from += mtd->oobblock;
 709                         column = 0;
 710                 }
 711         }
 712
 713 out:
 714         /* Deselect and wake up anyone waiting on the device */
 715         onenand_release_device(mtd);
 716
 717         *retlen = read;
 718         return ret;
 719 }
 720
 721 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
 722 /**
 723  * onenand_verify_page - [GENERIC] verify the chip contents after a write
 724  * @param mtd           MTD device structure
 725  * @param buf           the databuffer to verify
 726  *
 727  * Check DataRAM area directly
 728  */
 729 static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
 730 {
 731         struct onenand_chip *this = mtd->priv;
 732         void __iomem *dataram0, *dataram1;
 733         int ret = 0;
 734
 735         this->command(mtd, ONENAND_CMD_READ, addr, mtd->oobblock);
 736
 737         ret = this->wait(mtd, FL_READING);
 738         if (ret)
 739                 return ret;
 740
 741         onenand_update_bufferram(mtd, addr, 1);
 742
 743         /* Check, if the two dataram areas are same */
 744         dataram0 = this->base + ONENAND_DATARAM;
 745         dataram1 = dataram0 + mtd->oobblock;
 746
 747         if (memcmp(dataram0, dataram1, mtd->oobblock))
 748                 return -EBADMSG;
 749
 750         return 0;
 751 }
 752 #else
 753 #define onenand_verify_page(...)        (0)
 754 #endif
 755
 756 #define NOTALIGNED(x)   ((x & (mtd->oobblock - 1)) != 0)
 757
 758 /**
 759  * onenand_write_ecc - [MTD Interface] OneNAND write with ECC
 760  * @param mtd           MTD device structure
 761  * @param to            offset to write to
 762  * @param len           number of bytes to write
 763  * @param retlen        pointer to variable to store the number of written bytes
 764  * @param buf           the data to write
 765  * @param eccbuf        filesystem supplied oob data buffer
 766  * @param oobsel        oob selection structure
 767  *
 768  * OneNAND write with ECC
 769  */
 770 static int onenand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
 771         size_t *retlen, const u_char *buf,
 772         u_char *eccbuf, struct nand_oobinfo *oobsel)
 773 {
 774         struct onenand_chip *this = mtd->priv;
 775         int written = 0;
 776         int ret = 0;
 777
 778         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 779
 780         /* Initialize retlen, in case of early exit */
 781         *retlen = 0;
 782
 783         /* Do not allow writes past end of device */
 784         if (unlikely((to + len) > mtd->size)) {
 785                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt write to past end of device\n");
 786                 return -EINVAL;
 787         }
 788
 789         /* Reject writes, which are not page aligned */
 790         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
 791                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt to write not page aligned data\n");
 792                 return -EINVAL;
 793         }
 794
 795         /* Grab the lock and see if the device is available */
 796         onenand_get_device(mtd, FL_WRITING);
 797
 798         /* Loop until all data write */
 799         while (written < len) {
 800                 int thislen = min_t(int, mtd->oobblock, len - written);
 801
 802                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
 803
 804                 this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
 805                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 806
 807                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
 808
 809                 onenand_update_bufferram(mtd, to, 1);
 810
 811                 ret = this->wait(mtd, FL_WRITING);
 812                 if (ret) {
 813                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: write filaed %d\n", ret);
 814                         goto out;
 815                 }
 816
 817                 written += thislen;
 818
 819                 /* Only check verify write turn on */
 820                 ret = onenand_verify_page(mtd, (u_char *) buf, to);
 821                 if (ret) {
 822                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: verify failed %d\n", ret);
 823                         goto out;
 824                 }
 825
 826                 if (written == len)
 827                         break;
 828
 829                 to += thislen;
 830                 buf += thislen;
 831         }
 832
 833 out:
 834         /* Deselect and wake up anyone waiting on the device */
 835         onenand_release_device(mtd);
 836
 837         *retlen = written;
 838
 839         return ret;
 840 }
 841
 842 /**
 843  * onenand_write - [MTD Interface] compability function for onenand_write_ecc
 844  * @param mtd           MTD device structure
 845  * @param to            offset to write to
 846  * @param len           number of bytes to write
 847  * @param retlen        pointer to variable to store the number of written bytes
 848  * @param buf           the data to write
 849  *
 850  * This function simply calls onenand_write_ecc
 851  * with oob buffer and oobsel = NULL
 852  */
 853 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
 854         size_t *retlen, const u_char *buf)
 855 {
 856         return onenand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL);
 857 }
 858
 859 /**
 860  * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
 861  * @param mtd           MTD device structure
 862  * @param to            offset to write to
 863  * @param len           number of bytes to write
 864  * @param retlen        pointer to variable to store the number of written bytes
 865  * @param buf           the data to write
 866  *
 867  * OneNAND write out-of-band
 868  */
 869 static int onenand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
 870         size_t *retlen, const u_char *buf)
 871 {
 872         struct onenand_chip *this = mtd->priv;
 873         int column, status;
 874         int written = 0;
 875
 876         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 877
 878         /* Initialize retlen, in case of early exit */
 879         *retlen = 0;
 880
 881         /* Do not allow writes past end of device */
 882         if (unlikely((to + len) > mtd->size)) {
 883                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n");
 884                 return -EINVAL;
 885         }
 886
 887         /* Grab the lock and see if the device is available */
 888         onenand_get_device(mtd, FL_WRITING);
 889
 890         /* Loop until all data write */
 891         while (written < len) {
 892                 int thislen = min_t(int, mtd->oobsize, len - written);
 893
 894                 column = to & (mtd->oobsize - 1);
 895
 896                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
 897
 898                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 899                 this->write_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 900
 901                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
 902
 903                 onenand_update_bufferram(mtd, to, 0);
 904
 905                 status = this->wait(mtd, FL_WRITING);
 906                 if (status)
 907                         goto out;
 908
 909                 written += thislen;
 910
 911                 if (written == len)
 912                         break;
 913
 914                 to += thislen;
 915                 buf += thislen;
 916         }
 917
 918 out:
 919         /* Deselect and wake up anyone waiting on the device */
 920         onenand_release_device(mtd);
 921
 922         *retlen = written;
 923
 924         return 0;
 925 }
 926
 927 /**
 928  * onenand_writev_ecc - [MTD Interface] write with iovec with ecc
 929  * @param mtd           MTD device structure
 930  * @param vecs          the iovectors to write
 931  * @param count         number of vectors
 932  * @param to            offset to write to
 933  * @param retlen        pointer to variable to store the number of written bytes
 934  * @param eccbuf        filesystem supplied oob data buffer
 935  * @param oobsel        oob selection structure
 936  *
 937  * OneNAND write with iovec with ecc
 938  */
 939 static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
 940         unsigned long count, loff_t to, size_t *retlen,
 941         u_char *eccbuf, struct nand_oobinfo *oobsel)
 942 {
 943         struct onenand_chip *this = mtd->priv;
 944         unsigned char *pbuf;
 945         size_t total_len, len;
 946         int i, written = 0;
 947         int ret = 0;
 948
 949         /* Preset written len for early exit */
 950         *retlen = 0;
 951
 952         /* Calculate total length of data */
 953         total_len = 0;
 954         for (i = 0; i < count; i++)
 955                 total_len += vecs[i].iov_len;
 956
 957         DEBUG(MTD_DEBUG_LEVEL3, "onenand_writev_ecc: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count);
 958
 959         /* Do not allow write past end of the device */
 960         if (unlikely((to + total_len) > mtd->size)) {
 961                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempted write 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(total_len))) {
 967                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: 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         /* TODO handling oob */
 975
 976         /* Loop until all keve's data has been written */
 977         len = 0;
 978         while (count) {
 979                 pbuf = this->page_buf;
 980                 /*
 981                  * If the given tuple is >= pagesize then
 982                  * write it out from the iov
 983                  */
 984                 if ((vecs->iov_len - len) >= mtd->oobblock) {
 985                         pbuf = vecs->iov_base + len;
 986
 987                         len += mtd->oobblock;
 988
 989                         /* Check, if we have to switch to the next tuple */
 990                         if (len >= (int) vecs->iov_len) {
 991                                 vecs++;
 992                                 len = 0;
 993                                 count--;
 994                         }
 995                 } else {
 996                         int cnt = 0, thislen;
 997                         while (cnt < mtd->oobblock) {
 998                                 thislen = min_t(int, mtd->oobblock - cnt, vecs->iov_len - len);
 999                                 memcpy(this->page_buf + cnt, vecs->iov_base + len, thislen);
1000                                 cnt += thislen;
1001                                 len += thislen;
1002
1003                                 /* Check, if we have to switch to the next tuple */
1004                                 if (len >= (int) vecs->iov_len) {
1005                                         vecs++;
1006                                         len = 0;
1007                                         count--;
1008                                 }
1009                         }
1010                 }
1011
1012                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
1013
1014                 this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->oobblock);
1015                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
1016
1017                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
1018
1019                 onenand_update_bufferram(mtd, to, 1);
1020
1021                 ret = this->wait(mtd, FL_WRITING);
1022                 if (ret) {
1023                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret);
1024                         goto out;
1025                 }
1026
1027
1028                 /* Only check verify write turn on */
1029                 ret = onenand_verify_page(mtd, (u_char *) pbuf, to);
1030                 if (ret) {
1031                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret);
1032                         goto out;
1033                 }
1034
1035                 written += mtd->oobblock;
1036
1037                 to += mtd->oobblock;
1038         }
1039
1040 out:
1041         /* Deselect and wakt up anyone waiting on the device */
1042         onenand_release_device(mtd);
1043
1044         *retlen = written;
1045
1046         return 0;
1047 }
1048
1049 /**
1050  * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc
1051  * @param mtd           MTD device structure
1052  * @param vecs          the iovectors to write
1053  * @param count         number of vectors
1054  * @param to            offset to write to
1055  * @param retlen        pointer to variable to store the number of written bytes
1056  *
1057  * OneNAND write with kvec. This just calls the ecc function
1058  */
1059 static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
1060         unsigned long count, loff_t to, size_t *retlen)
1061 {
1062         return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
1063 }
1064
1065 /**
1066  * onenand_block_checkbad - [GENERIC] Check if a block is marked bad
1067  * @param mtd           MTD device structure
1068  * @param ofs           offset from device start
1069  * @param getchip       0, if the chip is already selected
1070  * @param allowbbt      1, if its allowed to access the bbt area
1071  *
1072  * Check, if the block is bad. Either by reading the bad block table or
1073  * calling of the scan function.
1074  */
1075 static int onenand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt)
1076 {
1077         struct onenand_chip *this = mtd->priv;
1078         struct bbm_info *bbm = this->bbm;
1079
1080         /* Return info from the table */
1081         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1082 }
1083
1084 /**
1085  * onenand_erase - [MTD Interface] erase block(s)
1086  * @param mtd           MTD device structure
1087  * @param instr         erase instruction
1088  *
1089  * Erase one ore more blocks
1090  */
1091 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1092 {
1093         struct onenand_chip *this = mtd->priv;
1094         unsigned int block_size;
1095         loff_t addr;
1096         int len;
1097         int ret = 0;
1098
1099         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
1100
1101         block_size = (1 << this->erase_shift);
1102
1103         /* Start address must align on block boundary */
1104         if (unlikely(instr->addr & (block_size - 1))) {
1105                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
1106                 return -EINVAL;
1107         }
1108
1109         /* Length must align on block boundary */
1110         if (unlikely(instr->len & (block_size - 1))) {
1111                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n");
1112                 return -EINVAL;
1113         }
1114
1115         /* Do not allow erase past end of device */
1116         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1117                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n");
1118                 return -EINVAL;
1119         }
1120
1121         instr->fail_addr = 0xffffffff;
1122
1123         /* Grab the lock and see if the device is available */
1124         onenand_get_device(mtd, FL_ERASING);
1125
1126         /* Loop throught the pages */
1127         len = instr->len;
1128         addr = instr->addr;
1129
1130         instr->state = MTD_ERASING;
1131
1132         while (len) {
1133
1134                 /* Check if we have a bad block, we do not erase bad blocks */
1135                 if (onenand_block_checkbad(mtd, addr, 0, 0)) {
1136                         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
1137                         instr->state = MTD_ERASE_FAILED;
1138                         goto erase_exit;
1139                 }
1140
1141                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1142
1143                 ret = this->wait(mtd, FL_ERASING);
1144                 /* Check, if it is write protected */
1145                 if (ret) {
1146                         if (ret == -EPERM)
1147                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
1148                         else
1149                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
1150                         instr->state = MTD_ERASE_FAILED;
1151                         instr->fail_addr = addr;
1152                         goto erase_exit;
1153                 }
1154
1155                 len -= block_size;
1156                 addr += block_size;
1157         }
1158
1159         instr->state = MTD_ERASE_DONE;
1160
1161 erase_exit:
1162
1163         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1164         /* Do call back function */
1165         if (!ret)
1166                 mtd_erase_callback(instr);
1167
1168         /* Deselect and wake up anyone waiting on the device */
1169         onenand_release_device(mtd);
1170
1171         return ret;
1172 }
1173
1174 /**
1175  * onenand_sync - [MTD Interface] sync
1176  * @param mtd           MTD device structure
1177  *
1178  * Sync is actually a wait for chip ready function
1179  */
1180 static void onenand_sync(struct mtd_info *mtd)
1181 {
1182         DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1183
1184         /* Grab the lock and see if the device is available */
1185         onenand_get_device(mtd, FL_SYNCING);
1186
1187         /* Release it and go back */
1188         onenand_release_device(mtd);
1189 }
1190
1191
1192 /**
1193  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1194  * @param mtd           MTD device structure
1195  * @param ofs           offset relative to mtd start
1196  *
1197  * Check whether the block is bad
1198  */
1199 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1200 {
1201         /* Check for invalid offset */
1202         if (ofs > mtd->size)
1203                 return -EINVAL;
1204
1205         return onenand_block_checkbad(mtd, ofs, 1, 0);
1206 }
1207
1208 /**
1209  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1210  * @param mtd           MTD device structure
1211  * @param ofs           offset from device start
1212  *
1213  * This is the default implementation, which can be overridden by
1214  * a hardware specific driver.
1215  */
1216 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1217 {
1218         struct onenand_chip *this = mtd->priv;
1219         struct bbm_info *bbm = this->bbm;
1220         u_char buf[2] = {0, 0};
1221         size_t retlen;
1222         int block;
1223
1224         /* Get block number */
1225         block = ((int) ofs) >> bbm->bbt_erase_shift;
1226         if (bbm->bbt)
1227                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1228
1229         /* We write two bytes, so we dont have to mess with 16 bit access */
1230         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1231         return mtd->write_oob(mtd, ofs , 2, &retlen, buf);
1232 }
1233
1234 /**
1235  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1236  * @param mtd           MTD device structure
1237  * @param ofs           offset relative to mtd start
1238  *
1239  * Mark the block as bad
1240  */
1241 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1242 {
1243         struct onenand_chip *this = mtd->priv;
1244         int ret;
1245
1246         ret = onenand_block_isbad(mtd, ofs);
1247         if (ret) {
1248                 /* If it was bad already, return success and do nothing */
1249                 if (ret > 0)
1250                         return 0;
1251                 return ret;
1252         }
1253
1254         return this->block_markbad(mtd, ofs);
1255 }
1256
1257 /**
1258  * onenand_unlock - [MTD Interface] Unlock block(s)
1259  * @param mtd           MTD device structure
1260  * @param ofs           offset relative to mtd start
1261  * @param len           number of bytes to unlock
1262  *
1263  * Unlock one or more blocks
1264  */
1265 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1266 {
1267         struct onenand_chip *this = mtd->priv;
1268         int start, end, block, value, status;
1269
1270         start = ofs >> this->erase_shift;
1271         end = len >> this->erase_shift;
1272
1273         /* Continuous lock scheme */
1274         if (this->options & ONENAND_CONT_LOCK) {
1275                 /* Set start block address */
1276                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1277                 /* Set end block address */
1278                 this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1279                 /* Write unlock command */
1280                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1281
1282                 /* There's no return value */
1283                 this->wait(mtd, FL_UNLOCKING);
1284
1285                 /* Sanity check */
1286                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1287                     & ONENAND_CTRL_ONGO)
1288                         continue;
1289
1290                 /* Check lock status */
1291                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1292                 if (!(status & ONENAND_WP_US))
1293                         printk(KERN_ERR "wp status = 0x%x\n", status);
1294
1295                 return 0;
1296         }
1297
1298         /* Block lock scheme */
1299         for (block = start; block < end; block++) {
1300                 /* Set block address */
1301                 value = onenand_block_address(this, block);
1302                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1303                 /* Select DataRAM for DDP */
1304                 value = onenand_bufferram_address(this, block);
1305                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1306                 /* Set start block address */
1307                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1308                 /* Write unlock command */
1309                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1310
1311                 /* There's no return value */
1312                 this->wait(mtd, FL_UNLOCKING);
1313
1314                 /* Sanity check */
1315                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1316                     & ONENAND_CTRL_ONGO)
1317                         continue;
1318
1319                 /* Check lock status */
1320                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1321                 if (!(status & ONENAND_WP_US))
1322                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
1323         }
1324
1325         return 0;
1326 }
1327
1328 /**
1329  * onenand_print_device_info - Print device ID
1330  * @param device        device ID
1331  *
1332  * Print device ID
1333  */
1334 static void onenand_print_device_info(int device)
1335 {
1336         int vcc, demuxed, ddp, density;
1337
1338         vcc = device & ONENAND_DEVICE_VCC_MASK;
1339         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
1340         ddp = device & ONENAND_DEVICE_IS_DDP;
1341         density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
1342         printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
1343                 demuxed ? "" : "Muxed ",
1344                 ddp ? "(DDP)" : "",
1345                 (16 << density),
1346                 vcc ? "2.65/3.3" : "1.8",
1347                 device);
1348 }
1349
1350 static const struct onenand_manufacturers onenand_manuf_ids[] = {
1351         {ONENAND_MFR_SAMSUNG, "Samsung"},
1352 };
1353
1354 /**
1355  * onenand_check_maf - Check manufacturer ID
1356  * @param manuf         manufacturer ID
1357  *
1358  * Check manufacturer ID
1359  */
1360 static int onenand_check_maf(int manuf)
1361 {
1362         int size = ARRAY_SIZE(onenand_manuf_ids);
1363         char *name;
1364         int i;
1365
1366         for (i = 0; i < size; i++)
1367                 if (manuf == onenand_manuf_ids[i].id)
1368                         break;
1369
1370         if (i < size)
1371                 name = onenand_manuf_ids[i].name;
1372         else
1373                 name = "Unknown";
1374
1375         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
1376
1377         return (i == size);
1378 }
1379
1380 /**
1381  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
1382  * @param mtd           MTD device structure
1383  *
1384  * OneNAND detection method:
1385  *   Compare the the values from command with ones from register
1386  */
1387 static int onenand_probe(struct mtd_info *mtd)
1388 {
1389         struct onenand_chip *this = mtd->priv;
1390         int bram_maf_id, bram_dev_id, maf_id, dev_id;
1391         int version_id;
1392         int density;
1393
1394         /* Send the command for reading device ID from BootRAM */
1395         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
1396
1397         /* Read manufacturer and device IDs from BootRAM */
1398         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
1399         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
1400
1401         /* Check manufacturer ID */
1402         if (onenand_check_maf(bram_maf_id))
1403                 return -ENXIO;
1404
1405         /* Reset OneNAND to read default register values */
1406         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
1407
1408         /* Read manufacturer and device IDs from Register */
1409         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
1410         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
1411
1412         /* Check OneNAND device */
1413         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
1414                 return -ENXIO;
1415
1416         /* Flash device information */
1417         onenand_print_device_info(dev_id);
1418         this->device_id = dev_id;
1419
1420         density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1421         this->chipsize = (16 << density) << 20;
1422         /* Set density mask. it is used for DDP */
1423         this->density_mask = (1 << (density + 6));
1424
1425         /* OneNAND page size & block size */
1426         /* The data buffer size is equal to page size */
1427         mtd->oobblock = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
1428         mtd->oobsize = mtd->oobblock >> 5;
1429         /* Pagers per block is always 64 in OneNAND */
1430         mtd->erasesize = mtd->oobblock << 6;
1431
1432         this->erase_shift = ffs(mtd->erasesize) - 1;
1433         this->page_shift = ffs(mtd->oobblock) - 1;
1434         this->ppb_shift = (this->erase_shift - this->page_shift);
1435         this->page_mask = (mtd->erasesize / mtd->oobblock) - 1;
1436
1437         /* REVIST: Multichip handling */
1438
1439         mtd->size = this->chipsize;
1440
1441         /* Version ID */
1442         version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
1443         printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);
1444
1445         /* Lock scheme */
1446         if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
1447             !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
1448                 printk(KERN_INFO "Lock scheme is Continues Lock\n");
1449                 this->options |= ONENAND_CONT_LOCK;
1450         }
1451
1452         return 0;
1453 }
1454
1455 /**
1456  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
1457  * @param mtd           MTD device structure
1458  */
1459 static int onenand_suspend(struct mtd_info *mtd)
1460 {
1461         return onenand_get_device(mtd, FL_PM_SUSPENDED);
1462 }
1463
1464 /**
1465  * onenand_resume - [MTD Interface] Resume the OneNAND flash
1466  * @param mtd           MTD device structure
1467  */
1468 static void onenand_resume(struct mtd_info *mtd)
1469 {
1470         struct onenand_chip *this = mtd->priv;
1471
1472         if (this->state == FL_PM_SUSPENDED)
1473                 onenand_release_device(mtd);
1474         else
1475                 printk(KERN_ERR "resume() called for the chip which is not"
1476                                 "in suspended state\n");
1477 }
1478
1479
1480 /**
1481  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
1482  * @param mtd           MTD device structure
1483  * @param maxchips      Number of chips to scan for
1484  *
1485  * This fills out all the not initialized function pointers
1486  * with the defaults.
1487  * The flash ID is read and the mtd/chip structures are
1488  * filled with the appropriate values.
1489  */
1490 int onenand_scan(struct mtd_info *mtd, int maxchips)
1491 {
1492         struct onenand_chip *this = mtd->priv;
1493
1494         if (!this->read_word)
1495                 this->read_word = onenand_readw;
1496         if (!this->write_word)
1497                 this->write_word = onenand_writew;
1498
1499         if (!this->command)
1500                 this->command = onenand_command;
1501         if (!this->wait)
1502                 this->wait = onenand_wait;
1503
1504         if (!this->read_bufferram)
1505                 this->read_bufferram = onenand_read_bufferram;
1506         if (!this->write_bufferram)
1507                 this->write_bufferram = onenand_write_bufferram;
1508
1509         if (!this->block_markbad)
1510                 this->block_markbad = onenand_default_block_markbad;
1511         if (!this->scan_bbt)
1512                 this->scan_bbt = onenand_default_bbt;
1513
1514         if (onenand_probe(mtd))
1515                 return -ENXIO;
1516
1517         /* Set Sync. Burst Read after probing */
1518         if (this->mmcontrol) {
1519                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
1520                 this->read_bufferram = onenand_sync_read_bufferram;
1521         }
1522
1523         /* Allocate buffers, if necessary */
1524         if (!this->page_buf) {
1525                 size_t len;
1526                 len = mtd->oobblock + mtd->oobsize;
1527                 this->page_buf = kmalloc(len, GFP_KERNEL);
1528                 if (!this->page_buf) {
1529                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
1530                         return -ENOMEM;
1531                 }
1532                 this->options |= ONENAND_PAGEBUF_ALLOC;
1533         }
1534
1535         this->state = FL_READY;
1536         init_waitqueue_head(&this->wq);
1537         spin_lock_init(&this->chip_lock);
1538
1539         switch (mtd->oobsize) {
1540         case 64:
1541                 this->autooob = &onenand_oob_64;
1542                 break;
1543
1544         case 32:
1545                 this->autooob = &onenand_oob_32;
1546                 break;
1547
1548         default:
1549                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
1550                         mtd->oobsize);
1551                 /* To prevent kernel oops */
1552                 this->autooob = &onenand_oob_32;
1553                 break;
1554         }
1555
1556         memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
1557
1558         /* Fill in remaining MTD driver data */
1559         mtd->type = MTD_NANDFLASH;
1560         mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC;
1561         mtd->ecctype = MTD_ECC_SW;
1562         mtd->erase = onenand_erase;
1563         mtd->point = NULL;
1564         mtd->unpoint = NULL;
1565         mtd->read = onenand_read;
1566         mtd->write = onenand_write;
1567         mtd->read_ecc = onenand_read_ecc;
1568         mtd->write_ecc = onenand_write_ecc;
1569         mtd->read_oob = onenand_read_oob;
1570         mtd->write_oob = onenand_write_oob;
1571         mtd->readv = NULL;
1572         mtd->readv_ecc = NULL;
1573         mtd->writev = onenand_writev;
1574         mtd->writev_ecc = onenand_writev_ecc;
1575         mtd->sync = onenand_sync;
1576         mtd->lock = NULL;
1577         mtd->unlock = onenand_unlock;
1578         mtd->suspend = onenand_suspend;
1579         mtd->resume = onenand_resume;
1580         mtd->block_isbad = onenand_block_isbad;
1581         mtd->block_markbad = onenand_block_markbad;
1582         mtd->owner = THIS_MODULE;
1583
1584         /* Unlock whole block */
1585         mtd->unlock(mtd, 0x0, this->chipsize);
1586
1587         return this->scan_bbt(mtd);
1588 }
1589
1590 /**
1591  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
1592  * @param mtd           MTD device structure
1593  */
1594 void onenand_release(struct mtd_info *mtd)
1595 {
1596         struct onenand_chip *this = mtd->priv;
1597
1598 #ifdef CONFIG_MTD_PARTITIONS
1599         /* Deregister partitions */
1600         del_mtd_partitions (mtd);
1601 #endif
1602         /* Deregister the device */
1603         del_mtd_device (mtd);
1604
1605         /* Free bad block table memory, if allocated */
1606         if (this->bbm)
1607                 kfree(this->bbm);
1608         /* Buffer allocated by onenand_scan */
1609         if (this->options & ONENAND_PAGEBUF_ALLOC)
1610                 kfree(this->page_buf);
1611 }
1612
1613 EXPORT_SYMBOL_GPL(onenand_scan);
1614 EXPORT_SYMBOL_GPL(onenand_release);
1615
1616 MODULE_LICENSE("GPL");
1617 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
1618 MODULE_DESCRIPTION("Generic OneNAND flash driver code");