Pileus Git - ~andy/linux/blob - 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/mtd/mtd.h>
  16 #include <linux/mtd/onenand.h>
  17 #include <linux/mtd/partitions.h>
  18
  19 #include <asm/io.h>
  20
  21 /**
  22  * onenand_oob_64 - oob info for large (2KB) page
  23  */
  24 static struct nand_oobinfo onenand_oob_64 = {
  25         .useecc         = MTD_NANDECC_AUTOPLACE,
  26         .eccbytes       = 20,
  27         .eccpos         = {
  28                 8, 9, 10, 11, 12,
  29                 24, 25, 26, 27, 28,
  30                 40, 41, 42, 43, 44,
  31                 56, 57, 58, 59, 60,
  32                 },
  33         .oobfree        = {
  34                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  35                 {24, 3}, {46, 2}, {40, 3}, {62, 2} }
  36 };
  37
  38 /**
  39  * onenand_oob_32 - oob info for middle (1KB) page
  40  */
  41 static struct nand_oobinfo onenand_oob_32 = {
  42         .useecc         = MTD_NANDECC_AUTOPLACE,
  43         .eccbytes       = 10,
  44         .eccpos         = {
  45                 8, 9, 10, 11, 12,
  46                 24, 25, 26, 27, 28,
  47                 },
  48         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  49 };
  50
  51 static const unsigned char ffchars[] = {
  52         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  53         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  54         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  55         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  56         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  57         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  58         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  59         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
  60 };
  61
  62 /**
  63  * onenand_readw - [OneNAND Interface] Read OneNAND register
  64  * @param addr          address to read
  65  *
  66  * Read OneNAND register
  67  */
  68 static unsigned short onenand_readw(void __iomem *addr)
  69 {
  70         return readw(addr);
  71 }
  72
  73 /**
  74  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
  75  * @param value         value to write
  76  * @param addr          address to write
  77  *
  78  * Write OneNAND register with value
  79  */
  80 static void onenand_writew(unsigned short value, void __iomem *addr)
  81 {
  82         writew(value, addr);
  83 }
  84
  85 /**
  86  * onenand_block_address - [DEFAULT] Get block address
  87  * @param device        the device id
  88  * @param block         the block
  89  * @return              translated block address if DDP, otherwise same
  90  *
  91  * Setup Start Address 1 Register (F100h)
  92  */
  93 static int onenand_block_address(int device, int block)
  94 {
  95         if (device & ONENAND_DEVICE_IS_DDP) {
  96                 /* Device Flash Core select, NAND Flash Block Address */
  97                 int dfs = 0, density, mask;
  98
  99                 density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
 100                 mask = (1 << (density + 6));
 101
 102                 if (block & mask)
 103                         dfs = 1;
 104
 105                 return (dfs << ONENAND_DDP_SHIFT) | (block & (mask - 1));
 106         }
 107
 108         return block;
 109 }
 110
 111 /**
 112  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 113  * @param device        the device id
 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(int device, int block)
 120 {
 121         if (device & ONENAND_DEVICE_IS_DDP) {
 122                 /* Device BufferRAM Select */
 123                 int dbs = 0, density, mask;
 124
 125                 density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
 126                 mask = (1 << (density + 6));
 127
 128                 if (block & mask)
 129                         dbs = 1;
 130
 131                 return (dbs << ONENAND_DDP_SHIFT);
 132         }
 133
 134         return 0;
 135 }
 136
 137 /**
 138  * onenand_page_address - [DEFAULT] Get page address
 139  * @param page          the page address
 140  * @param sector        the sector address
 141  * @return              combined page and sector address
 142  *
 143  * Setup Start Address 8 Register (F107h)
 144  */
 145 static int onenand_page_address(int page, int sector)
 146 {
 147         /* Flash Page Address, Flash Sector Address */
 148         int fpa, fsa;
 149
 150         fpa = page & ONENAND_FPA_MASK;
 151         fsa = sector & ONENAND_FSA_MASK;
 152
 153         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 154 }
 155
 156 /**
 157  * onenand_buffer_address - [DEFAULT] Get buffer address
 158  * @param dataram1      DataRAM index
 159  * @param sectors       the sector address
 160  * @param count         the number of sectors
 161  * @return              the start buffer value
 162  *
 163  * Setup Start Buffer Register (F200h)
 164  */
 165 static int onenand_buffer_address(int dataram1, int sectors, int count)
 166 {
 167         int bsa, bsc;
 168
 169         /* BufferRAM Sector Address */
 170         bsa = sectors & ONENAND_BSA_MASK;
 171
 172         if (dataram1)
 173                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 174         else
 175                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 176
 177         /* BufferRAM Sector Count */
 178         bsc = count & ONENAND_BSC_MASK;
 179
 180         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 181 }
 182
 183 /**
 184  * onenand_command - [DEFAULT] Send command to OneNAND device
 185  * @param mtd           MTD device structure
 186  * @param cmd           the command to be sent
 187  * @param addr          offset to read from or write to
 188  * @param len           number of bytes to read or write
 189  *
 190  * Send command to OneNAND device. This function is used for middle/large page
 191  * devices (1KB/2KB Bytes per page)
 192  */
 193 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 194 {
 195         struct onenand_chip *this = mtd->priv;
 196         int value, readcmd = 0;
 197         int block, page;
 198         /* Now we use page size operation */
 199         int sectors = 4, count = 4;
 200
 201         /* Address translation */
 202         switch (cmd) {
 203         case ONENAND_CMD_UNLOCK:
 204         case ONENAND_CMD_LOCK:
 205         case ONENAND_CMD_LOCK_TIGHT:
 206                 block = -1;
 207                 page = -1;
 208                 break;
 209
 210         case ONENAND_CMD_ERASE:
 211         case ONENAND_CMD_BUFFERRAM:
 212                 block = (int) (addr >> this->erase_shift);
 213                 page = -1;
 214                 break;
 215
 216         default:
 217                 block = (int) (addr >> this->erase_shift);
 218                 page = (int) (addr >> this->page_shift);
 219                 page &= this->page_mask;
 220                 break;
 221         }
 222
 223         /* NOTE: The setting order of the registers is very important! */
 224         if (cmd == ONENAND_CMD_BUFFERRAM) {
 225                 /* Select DataRAM for DDP */
 226                 value = onenand_bufferram_address(this->device_id, block);
 227                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 228
 229                 /* Switch to the next data buffer */
 230                 ONENAND_SET_NEXT_BUFFERRAM(this);
 231
 232                 return 0;
 233         }
 234
 235         if (block != -1) {
 236                 /* Write 'DFS, FBA' of Flash */
 237                 value = onenand_block_address(this->device_id, block);
 238                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 239         }
 240
 241         if (page != -1) {
 242                 int dataram;
 243
 244                 switch (cmd) {
 245                 case ONENAND_CMD_READ:
 246                 case ONENAND_CMD_READOOB:
 247                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 248                         readcmd = 1;
 249                         break;
 250
 251                 default:
 252                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 253                         break;
 254                 }
 255
 256                 /* Write 'FPA, FSA' of Flash */
 257                 value = onenand_page_address(page, sectors);
 258                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 259
 260                 /* Write 'BSA, BSC' of DataRAM */
 261                 value = onenand_buffer_address(dataram, sectors, count);
 262                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 263
 264                 if (readcmd) {
 265                         /* Select DataRAM for DDP */
 266                         value = onenand_bufferram_address(this->device_id, block);
 267                         this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 268                 }
 269         }
 270
 271         /* Interrupt clear */
 272         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 273
 274         /* Write command */
 275         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 276
 277         return 0;
 278 }
 279
 280 /**
 281  * onenand_wait - [DEFAULT] wait until the command is done
 282  * @param mtd           MTD device structure
 283  * @param state         state to select the max. timeout value
 284  *
 285  * Wait for command done. This applies to all OneNAND command
 286  * Read can take up to 30us, erase up to 2ms and program up to 350us
 287  * according to general OneNAND specs
 288  */
 289 static int onenand_wait(struct mtd_info *mtd, int state)
 290 {
 291         struct onenand_chip * this = mtd->priv;
 292         unsigned long timeout;
 293         unsigned int flags = ONENAND_INT_MASTER;
 294         unsigned int interrupt = 0;
 295         unsigned int ctrl, ecc;
 296
 297         /* The 20 msec is enough */
 298         timeout = jiffies + msecs_to_jiffies(20);
 299         while (time_before(jiffies, timeout)) {
 300                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 301
 302                 if (interrupt & flags)
 303                         break;
 304
 305                 if (state != FL_READING)
 306                         cond_resched();
 307         }
 308         /* To get correct interrupt status in timeout case */
 309         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 310
 311         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 312
 313         if (ctrl & ONENAND_CTRL_ERROR) {
 314                 /* It maybe occur at initial bad block */
 315                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: controller error = 0x%04x\n", ctrl);
 316                 /* Clear other interrupt bits for preventing ECC error */
 317                 interrupt &= ONENAND_INT_MASTER;
 318         }
 319
 320         if (ctrl & ONENAND_CTRL_LOCK) {
 321                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: it's locked error = 0x%04x\n", ctrl);
 322                 return -EACCES;
 323         }
 324
 325         if (interrupt & ONENAND_INT_READ) {
 326                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 327                 if (ecc & ONENAND_ECC_2BIT_ALL) {
 328                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_wait: ECC error = 0x%04x\n", ecc);
 329                         return -EBADMSG;
 330                 }
 331         }
 332
 333         return 0;
 334 }
 335
 336 /**
 337  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 338  * @param mtd           MTD data structure
 339  * @param area          BufferRAM area
 340  * @return              offset given area
 341  *
 342  * Return BufferRAM offset given area
 343  */
 344 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 345 {
 346         struct onenand_chip *this = mtd->priv;
 347
 348         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 349                 if (area == ONENAND_DATARAM)
 350                         return mtd->oobblock;
 351                 if (area == ONENAND_SPARERAM)
 352                         return mtd->oobsize;
 353         }
 354
 355         return 0;
 356 }
 357
 358 /**
 359  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 360  * @param mtd           MTD data structure
 361  * @param area          BufferRAM area
 362  * @param buffer        the databuffer to put/get data
 363  * @param offset        offset to read from or write to
 364  * @param count         number of bytes to read/write
 365  *
 366  * Read the BufferRAM area
 367  */
 368 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 369                 unsigned char *buffer, int offset, size_t count)
 370 {
 371         struct onenand_chip *this = mtd->priv;
 372         void __iomem *bufferram;
 373
 374         bufferram = this->base + area;
 375
 376         bufferram += onenand_bufferram_offset(mtd, area);
 377
 378         memcpy(buffer, bufferram + offset, count);
 379
 380         return 0;
 381 }
 382
 383 /**
 384  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 385  * @param mtd           MTD data structure
 386  * @param area          BufferRAM area
 387  * @param buffer        the databuffer to put/get data
 388  * @param offset        offset to read from or write to
 389  * @param count         number of bytes to read/write
 390  *
 391  * Read the BufferRAM area with Sync. Burst Mode
 392  */
 393 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 394                 unsigned char *buffer, int offset, size_t count)
 395 {
 396         struct onenand_chip *this = mtd->priv;
 397         void __iomem *bufferram;
 398
 399         bufferram = this->base + area;
 400
 401         bufferram += onenand_bufferram_offset(mtd, area);
 402
 403         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 404
 405         memcpy(buffer, bufferram + offset, count);
 406
 407         this->mmcontrol(mtd, 0);
 408
 409         return 0;
 410 }
 411
 412 /**
 413  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 414  * @param mtd           MTD data structure
 415  * @param area          BufferRAM area
 416  * @param buffer        the databuffer to put/get data
 417  * @param offset        offset to read from or write to
 418  * @param count         number of bytes to read/write
 419  *
 420  * Write the BufferRAM area
 421  */
 422 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 423                 const unsigned char *buffer, int offset, size_t count)
 424 {
 425         struct onenand_chip *this = mtd->priv;
 426         void __iomem *bufferram;
 427
 428         bufferram = this->base + area;
 429
 430         bufferram += onenand_bufferram_offset(mtd, area);
 431
 432         memcpy(bufferram + offset, buffer, count);
 433
 434         return 0;
 435 }
 436
 437 /**
 438  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 439  * @param mtd           MTD data structure
 440  * @param addr          address to check
 441  * @return              1 if there are valid data, otherwise 0
 442  *
 443  * Check bufferram if there is data we required
 444  */
 445 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 446 {
 447         struct onenand_chip *this = mtd->priv;
 448         int block, page;
 449         int i;
 450
 451         block = (int) (addr >> this->erase_shift);
 452         page = (int) (addr >> this->page_shift);
 453         page &= this->page_mask;
 454
 455         i = ONENAND_CURRENT_BUFFERRAM(this);
 456
 457         /* Is there valid data? */
 458         if (this->bufferram[i].block == block &&
 459             this->bufferram[i].page == page &&
 460             this->bufferram[i].valid)
 461                 return 1;
 462
 463         return 0;
 464 }
 465
 466 /**
 467  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 468  * @param mtd           MTD data structure
 469  * @param addr          address to update
 470  * @param valid         valid flag
 471  *
 472  * Update BufferRAM information
 473  */
 474 static int onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 475                 int valid)
 476 {
 477         struct onenand_chip *this = mtd->priv;
 478         int block, page;
 479         int i;
 480
 481         block = (int) (addr >> this->erase_shift);
 482         page = (int) (addr >> this->page_shift);
 483         page &= this->page_mask;
 484
 485         /* Invalidate BufferRAM */
 486         for (i = 0; i < MAX_BUFFERRAM; i++) {
 487                 if (this->bufferram[i].block == block &&
 488                     this->bufferram[i].page == page)
 489                         this->bufferram[i].valid = 0;
 490         }
 491
 492         /* Update BufferRAM */
 493         i = ONENAND_CURRENT_BUFFERRAM(this);
 494         this->bufferram[i].block = block;
 495         this->bufferram[i].page = page;
 496         this->bufferram[i].valid = valid;
 497
 498         return 0;
 499 }
 500
 501 /**
 502  * onenand_get_device - [GENERIC] Get chip for selected access
 503  * @param mtd           MTD device structure
 504  * @param new_state     the state which is requested
 505  *
 506  * Get the device and lock it for exclusive access
 507  */
 508 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 509 {
 510         struct onenand_chip *this = mtd->priv;
 511         DECLARE_WAITQUEUE(wait, current);
 512
 513         /*
 514          * Grab the lock and see if the device is available
 515          */
 516         while (1) {
 517                 spin_lock(&this->chip_lock);
 518                 if (this->state == FL_READY) {
 519                         this->state = new_state;
 520                         spin_unlock(&this->chip_lock);
 521                         break;
 522                 }
 523                 if (new_state == FL_PM_SUSPENDED) {
 524                         spin_unlock(&this->chip_lock);
 525                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 526                 }
 527                 set_current_state(TASK_UNINTERRUPTIBLE);
 528                 add_wait_queue(&this->wq, &wait);
 529                 spin_unlock(&this->chip_lock);
 530                 schedule();
 531                 remove_wait_queue(&this->wq, &wait);
 532         }
 533
 534         return 0;
 535 }
 536
 537 /**
 538  * onenand_release_device - [GENERIC] release chip
 539  * @param mtd           MTD device structure
 540  *
 541  * Deselect, release chip lock and wake up anyone waiting on the device
 542  */
 543 static void onenand_release_device(struct mtd_info *mtd)
 544 {
 545         struct onenand_chip *this = mtd->priv;
 546
 547         /* Release the chip */
 548         spin_lock(&this->chip_lock);
 549         this->state = FL_READY;
 550         wake_up(&this->wq);
 551         spin_unlock(&this->chip_lock);
 552 }
 553
 554 /**
 555  * onenand_read_ecc - [MTD Interface] Read data with ECC
 556  * @param mtd           MTD device structure
 557  * @param from          offset to read from
 558  * @param len           number of bytes to read
 559  * @param retlen        pointer to variable to store the number of read bytes
 560  * @param buf           the databuffer to put data
 561  * @param oob_buf       filesystem supplied oob data buffer
 562  * @param oobsel        oob selection structure
 563  *
 564  * OneNAND read with ECC
 565  */
 566 static int onenand_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
 567         size_t *retlen, u_char *buf,
 568         u_char *oob_buf, struct nand_oobinfo *oobsel)
 569 {
 570         struct onenand_chip *this = mtd->priv;
 571         int read = 0, column;
 572         int thislen;
 573         int ret = 0;
 574
 575         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ecc: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 576
 577         /* Do not allow reads past end of device */
 578         if ((from + len) > mtd->size) {
 579                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: Attempt read beyond end of device\n");
 580                 *retlen = 0;
 581                 return -EINVAL;
 582         }
 583
 584         /* Grab the lock and see if the device is available */
 585         onenand_get_device(mtd, FL_READING);
 586
 587         /* TODO handling oob */
 588
 589         while (read < len) {
 590                 thislen = min_t(int, mtd->oobblock, len - read);
 591
 592                 column = from & (mtd->oobblock - 1);
 593                 if (column + thislen > mtd->oobblock)
 594                         thislen = mtd->oobblock - column;
 595
 596                 if (!onenand_check_bufferram(mtd, from)) {
 597                         this->command(mtd, ONENAND_CMD_READ, from, mtd->oobblock);
 598
 599                         ret = this->wait(mtd, FL_READING);
 600                         /* First copy data and check return value for ECC handling */
 601                         onenand_update_bufferram(mtd, from, 1);
 602                 }
 603
 604                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
 605
 606                 read += thislen;
 607
 608                 if (read == len)
 609                         break;
 610
 611                 if (ret) {
 612                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_ecc: read failed = %d\n", ret);
 613                         goto out;
 614                 }
 615
 616                 from += thislen;
 617                 buf += thislen;
 618         }
 619
 620 out:
 621         /* Deselect and wake up anyone waiting on the device */
 622         onenand_release_device(mtd);
 623
 624         /*
 625          * Return success, if no ECC failures, else -EBADMSG
 626          * fs driver will take care of that, because
 627          * retlen == desired len and result == -EBADMSG
 628          */
 629         *retlen = read;
 630         return ret;
 631 }
 632
 633 /**
 634  * onenand_read - [MTD Interface] MTD compability function for onenand_read_ecc
 635  * @param mtd           MTD device structure
 636  * @param from          offset to read from
 637  * @param len           number of bytes to read
 638  * @param retlen        pointer to variable to store the number of read bytes
 639  * @param buf           the databuffer to put data
 640  *
 641  * This function simply calls onenand_read_ecc with oob buffer and oobsel = NULL
 642 */
 643 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
 644         size_t *retlen, u_char *buf)
 645 {
 646         return onenand_read_ecc(mtd, from, len, retlen, buf, NULL, NULL);
 647 }
 648
 649 /**
 650  * onenand_read_oob - [MTD Interface] OneNAND read out-of-band
 651  * @param mtd           MTD device structure
 652  * @param from          offset to read from
 653  * @param len           number of bytes to read
 654  * @param retlen        pointer to variable to store the number of read bytes
 655  * @param buf           the databuffer to put data
 656  *
 657  * OneNAND read out-of-band data from the spare area
 658  */
 659 static int onenand_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
 660         size_t *retlen, u_char *buf)
 661 {
 662         struct onenand_chip *this = mtd->priv;
 663         int read = 0, thislen, column;
 664         int ret = 0;
 665
 666         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 667
 668         /* Initialize return length value */
 669         *retlen = 0;
 670
 671         /* Do not allow reads past end of device */
 672         if (unlikely((from + len) > mtd->size)) {
 673                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: Attempt read beyond end of device\n");
 674                 return -EINVAL;
 675         }
 676
 677         /* Grab the lock and see if the device is available */
 678         onenand_get_device(mtd, FL_READING);
 679
 680         column = from & (mtd->oobsize - 1);
 681
 682         while (read < len) {
 683                 thislen = mtd->oobsize - column;
 684                 thislen = min_t(int, thislen, len);
 685
 686                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 687
 688                 onenand_update_bufferram(mtd, from, 0);
 689
 690                 ret = this->wait(mtd, FL_READING);
 691                 /* First copy data and check return value for ECC handling */
 692
 693                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 694
 695                 read += thislen;
 696
 697                 if (read == len)
 698                         break;
 699
 700                 if (ret) {
 701                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_read_oob: read failed = %d\n", ret);
 702                         goto out;
 703                 }
 704
 705                 buf += thislen;
 706
 707                 /* Read more? */
 708                 if (read < len) {
 709                         /* Page size */
 710                         from += mtd->oobblock;
 711                         column = 0;
 712                 }
 713         }
 714
 715 out:
 716         /* Deselect and wake up anyone waiting on the device */
 717         onenand_release_device(mtd);
 718
 719         *retlen = read;
 720         return ret;
 721 }
 722
 723 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
 724 /**
 725  * onenand_verify_page - [GENERIC] verify the chip contents after a write
 726  * @param mtd           MTD device structure
 727  * @param buf           the databuffer to verify
 728  *
 729  * Check DataRAM area directly
 730  */
 731 static int onenand_verify_page(struct mtd_info *mtd, u_char *buf, loff_t addr)
 732 {
 733         struct onenand_chip *this = mtd->priv;
 734         void __iomem *dataram0, *dataram1;
 735         int ret = 0;
 736
 737         this->command(mtd, ONENAND_CMD_READ, addr, mtd->oobblock);
 738
 739         ret = this->wait(mtd, FL_READING);
 740         if (ret)
 741                 return ret;
 742
 743         onenand_update_bufferram(mtd, addr, 1);
 744
 745         /* Check, if the two dataram areas are same */
 746         dataram0 = this->base + ONENAND_DATARAM;
 747         dataram1 = dataram0 + mtd->oobblock;
 748
 749         if (memcmp(dataram0, dataram1, mtd->oobblock))
 750                 return -EBADMSG;
 751
 752         return 0;
 753 }
 754 #else
 755 #define onenand_verify_page(...)        (0)
 756 #endif
 757
 758 #define NOTALIGNED(x)   ((x & (mtd->oobblock - 1)) != 0)
 759
 760 /**
 761  * onenand_write_ecc - [MTD Interface] OneNAND write with ECC
 762  * @param mtd           MTD device structure
 763  * @param to            offset to write to
 764  * @param len           number of bytes to write
 765  * @param retlen        pointer to variable to store the number of written bytes
 766  * @param buf           the data to write
 767  * @param eccbuf        filesystem supplied oob data buffer
 768  * @param oobsel        oob selection structure
 769  *
 770  * OneNAND write with ECC
 771  */
 772 static int onenand_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
 773         size_t *retlen, const u_char *buf,
 774         u_char *eccbuf, struct nand_oobinfo *oobsel)
 775 {
 776         struct onenand_chip *this = mtd->priv;
 777         int written = 0;
 778         int ret = 0;
 779
 780         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ecc: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 781
 782         /* Initialize retlen, in case of early exit */
 783         *retlen = 0;
 784
 785         /* Do not allow writes past end of device */
 786         if (unlikely((to + len) > mtd->size)) {
 787                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt write to past end of device\n");
 788                 return -EINVAL;
 789         }
 790
 791         /* Reject writes, which are not page aligned */
 792         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
 793                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: Attempt to write not page aligned data\n");
 794                 return -EINVAL;
 795         }
 796
 797         /* Grab the lock and see if the device is available */
 798         onenand_get_device(mtd, FL_WRITING);
 799
 800         /* Loop until all data write */
 801         while (written < len) {
 802                 int thislen = min_t(int, mtd->oobblock, len - written);
 803
 804                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
 805
 806                 this->write_bufferram(mtd, ONENAND_DATARAM, buf, 0, thislen);
 807                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 808
 809                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
 810
 811                 onenand_update_bufferram(mtd, to, 1);
 812
 813                 ret = this->wait(mtd, FL_WRITING);
 814                 if (ret) {
 815                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: write filaed %d\n", ret);
 816                         goto out;
 817                 }
 818
 819                 written += thislen;
 820
 821                 /* Only check verify write turn on */
 822                 ret = onenand_verify_page(mtd, (u_char *) buf, to);
 823                 if (ret) {
 824                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_ecc: verify failed %d\n", ret);
 825                         goto out;
 826                 }
 827
 828                 if (written == len)
 829                         break;
 830
 831                 to += thislen;
 832                 buf += thislen;
 833         }
 834
 835 out:
 836         /* Deselect and wake up anyone waiting on the device */
 837         onenand_release_device(mtd);
 838
 839         *retlen = written;
 840
 841         return ret;
 842 }
 843
 844 /**
 845  * onenand_write - [MTD Interface] compability function for onenand_write_ecc
 846  * @param mtd           MTD device structure
 847  * @param to            offset to write to
 848  * @param len           number of bytes to write
 849  * @param retlen        pointer to variable to store the number of written bytes
 850  * @param buf           the data to write
 851  *
 852  * This function simply calls onenand_write_ecc
 853  * with oob buffer and oobsel = NULL
 854  */
 855 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
 856         size_t *retlen, const u_char *buf)
 857 {
 858         return onenand_write_ecc(mtd, to, len, retlen, buf, NULL, NULL);
 859 }
 860
 861 /**
 862  * onenand_write_oob - [MTD Interface] OneNAND write out-of-band
 863  * @param mtd           MTD device structure
 864  * @param to            offset to write to
 865  * @param len           number of bytes to write
 866  * @param retlen        pointer to variable to store the number of written bytes
 867  * @param buf           the data to write
 868  *
 869  * OneNAND write out-of-band
 870  */
 871 static int onenand_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
 872         size_t *retlen, const u_char *buf)
 873 {
 874         struct onenand_chip *this = mtd->priv;
 875         int column, status;
 876         int written = 0;
 877
 878         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
 879
 880         /* Initialize retlen, in case of early exit */
 881         *retlen = 0;
 882
 883         /* Do not allow writes past end of device */
 884         if (unlikely((to + len) > mtd->size)) {
 885                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_write_oob: Attempt write to past end of device\n");
 886                 return -EINVAL;
 887         }
 888
 889         /* Grab the lock and see if the device is available */
 890         onenand_get_device(mtd, FL_WRITING);
 891
 892         /* Loop until all data write */
 893         while (written < len) {
 894                 int thislen = min_t(int, mtd->oobsize, len - written);
 895
 896                 column = to & (mtd->oobsize - 1);
 897
 898                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
 899
 900                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
 901                 this->write_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
 902
 903                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
 904
 905                 onenand_update_bufferram(mtd, to, 0);
 906
 907                 status = this->wait(mtd, FL_WRITING);
 908                 if (status)
 909                         goto out;
 910
 911                 written += thislen;
 912
 913                 if (written == len)
 914                         break;
 915
 916                 to += thislen;
 917                 buf += thislen;
 918         }
 919
 920 out:
 921         /* Deselect and wake up anyone waiting on the device */
 922         onenand_release_device(mtd);
 923
 924         *retlen = written;
 925
 926         return 0;
 927 }
 928
 929 /**
 930  * onenand_writev_ecc - [MTD Interface] write with iovec with ecc
 931  * @param mtd           MTD device structure
 932  * @param vecs          the iovectors to write
 933  * @param count         number of vectors
 934  * @param to            offset to write to
 935  * @param retlen        pointer to variable to store the number of written bytes
 936  * @param eccbuf        filesystem supplied oob data buffer
 937  * @param oobsel        oob selection structure
 938  *
 939  * OneNAND write with iovec with ecc
 940  */
 941 static int onenand_writev_ecc(struct mtd_info *mtd, const struct kvec *vecs,
 942         unsigned long count, loff_t to, size_t *retlen,
 943         u_char *eccbuf, struct nand_oobinfo *oobsel)
 944 {
 945         struct onenand_chip *this = mtd->priv;
 946         unsigned char buffer[MAX_ONENAND_PAGESIZE], *pbuf;
 947         size_t total_len, len;
 948         int i, written = 0;
 949         int ret = 0;
 950
 951         /* Preset written len for early exit */
 952         *retlen = 0;
 953
 954         /* Calculate total length of data */
 955         total_len = 0;
 956         for (i = 0; i < count; i++)
 957                 total_len += vecs[i].iov_len;
 958
 959         DEBUG(MTD_DEBUG_LEVEL3, "onenand_writev_ecc: to = 0x%08x, len = %i, count = %ld\n", (unsigned int) to, (unsigned int) total_len, count);
 960
 961         /* Do not allow write past end of the device */
 962         if (unlikely((to + total_len) > mtd->size)) {
 963                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempted write past end of device\n");
 964                 return -EINVAL;
 965         }
 966
 967         /* Reject writes, which are not page aligned */
 968         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(total_len))) {
 969                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: Attempt to write not page aligned data\n");
 970                 return -EINVAL;
 971         }
 972
 973         /* Grab the lock and see if the device is available */
 974         onenand_get_device(mtd, FL_WRITING);
 975
 976         /* TODO handling oob */
 977
 978         /* Loop until all keve's data has been written */
 979         len = 0;
 980         while (count) {
 981                 pbuf = buffer;
 982                 /*
 983                  * If the given tuple is >= pagesize then
 984                  * write it out from the iov
 985                  */
 986                 if ((vecs->iov_len - len) >= mtd->oobblock) {
 987                         pbuf = vecs->iov_base + len;
 988
 989                         len += mtd->oobblock;
 990
 991                         /* Check, if we have to switch to the next tuple */
 992                         if (len >= (int) vecs->iov_len) {
 993                                 vecs++;
 994                                 len = 0;
 995                                 count--;
 996                         }
 997                 } else {
 998                         int cnt = 0, thislen;
 999                         while (cnt < mtd->oobblock) {
1000                                 thislen = min_t(int, mtd->oobblock - cnt, vecs->iov_len - len);
1001                                 memcpy(buffer + cnt, vecs->iov_base + len, thislen);
1002                                 cnt += thislen;
1003                                 len += thislen;
1004
1005                                 /* Check, if we have to switch to the next tuple */
1006                                 if (len >= (int) vecs->iov_len) {
1007                                         vecs++;
1008                                         len = 0;
1009                                         count--;
1010                                 }
1011                         }
1012                 }
1013
1014                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobblock);
1015
1016                 this->write_bufferram(mtd, ONENAND_DATARAM, pbuf, 0, mtd->oobblock);
1017                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
1018
1019                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->oobblock);
1020
1021                 onenand_update_bufferram(mtd, to, 1);
1022
1023                 ret = this->wait(mtd, FL_WRITING);
1024                 if (ret) {
1025                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: write failed %d\n", ret);
1026                         goto out;
1027                 }
1028
1029
1030                 /* Only check verify write turn on */
1031                 ret = onenand_verify_page(mtd, (u_char *) pbuf, to);
1032                 if (ret) {
1033                         DEBUG(MTD_DEBUG_LEVEL0, "onenand_writev_ecc: verify failed %d\n", ret);
1034                         goto out;
1035                 }
1036
1037                 written += mtd->oobblock;
1038
1039                 to += mtd->oobblock;
1040         }
1041
1042 out:
1043         /* Deselect and wakt up anyone waiting on the device */
1044         onenand_release_device(mtd);
1045
1046         *retlen = written;
1047
1048         return 0;
1049 }
1050
1051 /**
1052  * onenand_writev - [MTD Interface] compabilty function for onenand_writev_ecc
1053  * @param mtd           MTD device structure
1054  * @param vecs          the iovectors to write
1055  * @param count         number of vectors
1056  * @param to            offset to write to
1057  * @param retlen        pointer to variable to store the number of written bytes
1058  *
1059  * OneNAND write with kvec. This just calls the ecc function
1060  */
1061 static int onenand_writev(struct mtd_info *mtd, const struct kvec *vecs,
1062         unsigned long count, loff_t to, size_t *retlen)
1063 {
1064         return onenand_writev_ecc(mtd, vecs, count, to, retlen, NULL, NULL);
1065 }
1066
1067 /**
1068  * onenand_block_checkbad - [GENERIC] Check if a block is marked bad
1069  * @param mtd           MTD device structure
1070  * @param ofs           offset from device start
1071  * @param getchip       0, if the chip is already selected
1072  * @param allowbbt      1, if its allowed to access the bbt area
1073  *
1074  * Check, if the block is bad. Either by reading the bad block table or
1075  * calling of the scan function.
1076  */
1077 static int onenand_block_checkbad(struct mtd_info *mtd, loff_t ofs, int getchip, int allowbbt)
1078 {
1079         struct onenand_chip *this = mtd->priv;
1080         struct bbm_info *bbm = this->bbm;
1081
1082         /* Return info from the table */
1083         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1084 }
1085
1086 /**
1087  * onenand_erase - [MTD Interface] erase block(s)
1088  * @param mtd           MTD device structure
1089  * @param instr         erase instruction
1090  *
1091  * Erase one ore more blocks
1092  */
1093 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1094 {
1095         struct onenand_chip *this = mtd->priv;
1096         unsigned int block_size;
1097         loff_t addr;
1098         int len;
1099         int ret = 0;
1100
1101         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
1102
1103         block_size = (1 << this->erase_shift);
1104
1105         /* Start address must align on block boundary */
1106         if (unlikely(instr->addr & (block_size - 1))) {
1107                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Unaligned address\n");
1108                 return -EINVAL;
1109         }
1110
1111         /* Length must align on block boundary */
1112         if (unlikely(instr->len & (block_size - 1))) {
1113                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Length not block aligned\n");
1114                 return -EINVAL;
1115         }
1116
1117         /* Do not allow erase past end of device */
1118         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1119                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Erase past end of device\n");
1120                 return -EINVAL;
1121         }
1122
1123         instr->fail_addr = 0xffffffff;
1124
1125         /* Grab the lock and see if the device is available */
1126         onenand_get_device(mtd, FL_ERASING);
1127
1128         /* Loop throught the pages */
1129         len = instr->len;
1130         addr = instr->addr;
1131
1132         instr->state = MTD_ERASING;
1133
1134         while (len) {
1135
1136                 /* Check if we have a bad block, we do not erase bad blocks */
1137                 if (onenand_block_checkbad(mtd, addr, 0, 0)) {
1138                         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
1139                         instr->state = MTD_ERASE_FAILED;
1140                         goto erase_exit;
1141                 }
1142
1143                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1144
1145                 ret = this->wait(mtd, FL_ERASING);
1146                 /* Check, if it is write protected */
1147                 if (ret) {
1148                         if (ret == -EPERM)
1149                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Device is write protected!!!\n");
1150                         else
1151                                 DEBUG(MTD_DEBUG_LEVEL0, "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
1152                         instr->state = MTD_ERASE_FAILED;
1153                         instr->fail_addr = addr;
1154                         goto erase_exit;
1155                 }
1156
1157                 len -= block_size;
1158                 addr += block_size;
1159         }
1160
1161         instr->state = MTD_ERASE_DONE;
1162
1163 erase_exit:
1164
1165         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1166         /* Do call back function */
1167         if (!ret)
1168                 mtd_erase_callback(instr);
1169
1170         /* Deselect and wake up anyone waiting on the device */
1171         onenand_release_device(mtd);
1172
1173         return ret;
1174 }
1175
1176 /**
1177  * onenand_sync - [MTD Interface] sync
1178  * @param mtd           MTD device structure
1179  *
1180  * Sync is actually a wait for chip ready function
1181  */
1182 static void onenand_sync(struct mtd_info *mtd)
1183 {
1184         DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1185
1186         /* Grab the lock and see if the device is available */
1187         onenand_get_device(mtd, FL_SYNCING);
1188
1189         /* Release it and go back */
1190         onenand_release_device(mtd);
1191 }
1192
1193
1194 /**
1195  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1196  * @param mtd           MTD device structure
1197  * @param ofs           offset relative to mtd start
1198  *
1199  * Check whether the block is bad
1200  */
1201 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1202 {
1203         /* Check for invalid offset */
1204         if (ofs > mtd->size)
1205                 return -EINVAL;
1206
1207         return onenand_block_checkbad(mtd, ofs, 1, 0);
1208 }
1209
1210 /**
1211  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1212  * @param mtd           MTD device structure
1213  * @param ofs           offset from device start
1214  *
1215  * This is the default implementation, which can be overridden by
1216  * a hardware specific driver.
1217  */
1218 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1219 {
1220         struct onenand_chip *this = mtd->priv;
1221         struct bbm_info *bbm = this->bbm;
1222         u_char buf[2] = {0, 0};
1223         size_t retlen;
1224         int block;
1225
1226         /* Get block number */
1227         block = ((int) ofs) >> bbm->bbt_erase_shift;
1228         if (bbm->bbt)
1229                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1230
1231         /* We write two bytes, so we dont have to mess with 16 bit access */
1232         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1233         return mtd->write_oob(mtd, ofs , 2, &retlen, buf);
1234 }
1235
1236 /**
1237  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1238  * @param mtd           MTD device structure
1239  * @param ofs           offset relative to mtd start
1240  *
1241  * Mark the block as bad
1242  */
1243 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1244 {
1245         struct onenand_chip *this = mtd->priv;
1246         int ret;
1247
1248         ret = onenand_block_isbad(mtd, ofs);
1249         if (ret) {
1250                 /* If it was bad already, return success and do nothing */
1251                 if (ret > 0)
1252                         return 0;
1253                 return ret;
1254         }
1255
1256         return this->block_markbad(mtd, ofs);
1257 }
1258
1259 /**
1260  * onenand_unlock - [MTD Interface] Unlock block(s)
1261  * @param mtd           MTD device structure
1262  * @param ofs           offset relative to mtd start
1263  * @param len           number of bytes to unlock
1264  *
1265  * Unlock one or more blocks
1266  */
1267 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
1268 {
1269         struct onenand_chip *this = mtd->priv;
1270         int start, end, block, value, status;
1271
1272         start = ofs >> this->erase_shift;
1273         end = len >> this->erase_shift;
1274
1275         /* Continuous lock scheme */
1276         if (this->options & ONENAND_CONT_LOCK) {
1277                 /* Set start block address */
1278                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1279                 /* Set end block address */
1280                 this->write_word(end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1281                 /* Write unlock command */
1282                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1283
1284                 /* There's no return value */
1285                 this->wait(mtd, FL_UNLOCKING);
1286
1287                 /* Sanity check */
1288                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1289                     & ONENAND_CTRL_ONGO)
1290                         continue;
1291
1292                 /* Check lock status */
1293                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1294                 if (!(status & ONENAND_WP_US))
1295                         printk(KERN_ERR "wp status = 0x%x\n", status);
1296
1297                 return 0;
1298         }
1299
1300         /* Block lock scheme */
1301         for (block = start; block < end; block++) {
1302                 /* Set start block address */
1303                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1304                 /* Write unlock command */
1305                 this->command(mtd, ONENAND_CMD_UNLOCK, 0, 0);
1306
1307                 /* There's no return value */
1308                 this->wait(mtd, FL_UNLOCKING);
1309
1310                 /* Sanity check */
1311                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1312                     & ONENAND_CTRL_ONGO)
1313                         continue;
1314
1315                 /* Set block address for read block status */
1316                 value = onenand_block_address(this->device_id, block);
1317                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
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         {ONENAND_MFR_UNKNOWN, "Unknown"}
1353 };
1354
1355 /**
1356  * onenand_check_maf - Check manufacturer ID
1357  * @param manuf         manufacturer ID
1358  *
1359  * Check manufacturer ID
1360  */
1361 static int onenand_check_maf(int manuf)
1362 {
1363         int i;
1364
1365         for (i = 0; onenand_manuf_ids[i].id; i++) {
1366                 if (manuf == onenand_manuf_ids[i].id)
1367                         break;
1368         }
1369
1370         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n",
1371                 onenand_manuf_ids[i].name, manuf);
1372
1373         return (i != ONENAND_MFR_UNKNOWN);
1374 }
1375
1376 /**
1377  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
1378  * @param mtd           MTD device structure
1379  *
1380  * OneNAND detection method:
1381  *   Compare the the values from command with ones from register
1382  */
1383 static int onenand_probe(struct mtd_info *mtd)
1384 {
1385         struct onenand_chip *this = mtd->priv;
1386         int bram_maf_id, bram_dev_id, maf_id, dev_id;
1387         int version_id;
1388         int density;
1389
1390         /* Send the command for reading device ID from BootRAM */
1391         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
1392
1393         /* Read manufacturer and device IDs from BootRAM */
1394         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
1395         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
1396
1397         /* Check manufacturer ID */
1398         if (onenand_check_maf(bram_maf_id))
1399                 return -ENXIO;
1400
1401         /* Reset OneNAND to read default register values */
1402         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
1403
1404         /* Read manufacturer and device IDs from Register */
1405         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
1406         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
1407
1408         /* Check OneNAND device */
1409         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
1410                 return -ENXIO;
1411
1412         /* Flash device information */
1413         onenand_print_device_info(dev_id);
1414         this->device_id = dev_id;
1415
1416         density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
1417         this->chipsize = (16 << density) << 20;
1418
1419         /* OneNAND page size & block size */
1420         /* The data buffer size is equal to page size */
1421         mtd->oobblock = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
1422         mtd->oobsize = mtd->oobblock >> 5;
1423         /* Pagers per block is always 64 in OneNAND */
1424         mtd->erasesize = mtd->oobblock << 6;
1425
1426         this->erase_shift = ffs(mtd->erasesize) - 1;
1427         this->page_shift = ffs(mtd->oobblock) - 1;
1428         this->ppb_shift = (this->erase_shift - this->page_shift);
1429         this->page_mask = (mtd->erasesize / mtd->oobblock) - 1;
1430
1431         /* REVIST: Multichip handling */
1432
1433         mtd->size = this->chipsize;
1434
1435         /* Version ID */
1436         version_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
1437         printk(KERN_DEBUG "OneNAND version = 0x%04x\n", version_id);
1438
1439         /* Lock scheme */
1440         if (density <= ONENAND_DEVICE_DENSITY_512Mb &&
1441             !(version_id >> ONENAND_VERSION_PROCESS_SHIFT)) {
1442                 printk(KERN_INFO "Lock scheme is Continues Lock\n");
1443                 this->options |= ONENAND_CONT_LOCK;
1444         }
1445
1446         return 0;
1447 }
1448
1449 /**
1450  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
1451  * @param mtd           MTD device structure
1452  */
1453 static int onenand_suspend(struct mtd_info *mtd)
1454 {
1455         return onenand_get_device(mtd, FL_PM_SUSPENDED);
1456 }
1457
1458 /**
1459  * onenand_resume - [MTD Interface] Resume the OneNAND flash
1460  * @param mtd           MTD device structure
1461  */
1462 static void onenand_resume(struct mtd_info *mtd)
1463 {
1464         struct onenand_chip *this = mtd->priv;
1465
1466         if (this->state == FL_PM_SUSPENDED)
1467                 onenand_release_device(mtd);
1468         else
1469                 printk(KERN_ERR "resume() called for the chip which is not"
1470                                 "in suspended state\n");
1471 }
1472
1473
1474 /**
1475  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
1476  * @param mtd           MTD device structure
1477  * @param maxchips      Number of chips to scan for
1478  *
1479  * This fills out all the not initialized function pointers
1480  * with the defaults.
1481  * The flash ID is read and the mtd/chip structures are
1482  * filled with the appropriate values.
1483  */
1484 int onenand_scan(struct mtd_info *mtd, int maxchips)
1485 {
1486         struct onenand_chip *this = mtd->priv;
1487
1488         if (!this->read_word)
1489                 this->read_word = onenand_readw;
1490         if (!this->write_word)
1491                 this->write_word = onenand_writew;
1492
1493         if (!this->command)
1494                 this->command = onenand_command;
1495         if (!this->wait)
1496                 this->wait = onenand_wait;
1497
1498         if (!this->read_bufferram)
1499                 this->read_bufferram = onenand_read_bufferram;
1500         if (!this->write_bufferram)
1501                 this->write_bufferram = onenand_write_bufferram;
1502
1503         if (!this->block_markbad)
1504                 this->block_markbad = onenand_default_block_markbad;
1505         if (!this->scan_bbt)
1506                 this->scan_bbt = onenand_default_bbt;
1507
1508         if (onenand_probe(mtd))
1509                 return -ENXIO;
1510
1511         /* Set Sync. Burst Read after probing */
1512         if (this->mmcontrol) {
1513                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
1514                 this->read_bufferram = onenand_sync_read_bufferram;
1515         }
1516
1517         this->state = FL_READY;
1518         init_waitqueue_head(&this->wq);
1519         spin_lock_init(&this->chip_lock);
1520
1521         switch (mtd->oobsize) {
1522         case 64:
1523                 this->autooob = &onenand_oob_64;
1524                 break;
1525
1526         case 32:
1527                 this->autooob = &onenand_oob_32;
1528                 break;
1529
1530         default:
1531                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
1532                         mtd->oobsize);
1533                 /* To prevent kernel oops */
1534                 this->autooob = &onenand_oob_32;
1535                 break;
1536         }
1537
1538         memcpy(&mtd->oobinfo, this->autooob, sizeof(mtd->oobinfo));
1539
1540         /* Fill in remaining MTD driver data */
1541         mtd->type = MTD_NANDFLASH;
1542         mtd->flags = MTD_CAP_NANDFLASH | MTD_ECC;
1543         mtd->ecctype = MTD_ECC_SW;
1544         mtd->erase = onenand_erase;
1545         mtd->point = NULL;
1546         mtd->unpoint = NULL;
1547         mtd->read = onenand_read;
1548         mtd->write = onenand_write;
1549         mtd->read_ecc = onenand_read_ecc;
1550         mtd->write_ecc = onenand_write_ecc;
1551         mtd->read_oob = onenand_read_oob;
1552         mtd->write_oob = onenand_write_oob;
1553         mtd->readv = NULL;
1554         mtd->readv_ecc = NULL;
1555         mtd->writev = onenand_writev;
1556         mtd->writev_ecc = onenand_writev_ecc;
1557         mtd->sync = onenand_sync;
1558         mtd->lock = NULL;
1559         mtd->unlock = onenand_unlock;
1560         mtd->suspend = onenand_suspend;
1561         mtd->resume = onenand_resume;
1562         mtd->block_isbad = onenand_block_isbad;
1563         mtd->block_markbad = onenand_block_markbad;
1564         mtd->owner = THIS_MODULE;
1565
1566         /* Unlock whole block */
1567         mtd->unlock(mtd, 0x0, this->chipsize);
1568
1569         return this->scan_bbt(mtd);
1570 }
1571
1572 /**
1573  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
1574  * @param mtd           MTD device structure
1575  */
1576 void onenand_release(struct mtd_info *mtd)
1577 {
1578 #ifdef CONFIG_MTD_PARTITIONS
1579         /* Deregister partitions */
1580         del_mtd_partitions (mtd);
1581 #endif
1582         /* Deregister the device */
1583         del_mtd_device (mtd);
1584 }
1585
1586 EXPORT_SYMBOL_GPL(onenand_scan);
1587 EXPORT_SYMBOL_GPL(onenand_release);
1588
1589 MODULE_LICENSE("GPL");
1590 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
1591 MODULE_DESCRIPTION("Generic OneNAND flash driver code");