drivers/mtd/onenand/onenand_base.c

   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright (C) 2005-2007 Samsung Electronics
   5  *  Kyungmin Park <kyungmin.park@samsung.com>
   6  *
   7  *  Credits:
   8  *      Adrian Hunter <ext-adrian.hunter@nokia.com>:
   9  *      auto-placement support, read-while load support, various fixes
  10  *      Copyright (C) Nokia Corporation, 2007
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/sched.h>
  21 #include <linux/delay.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/jiffies.h>
  24 #include <linux/mtd/mtd.h>
  25 #include <linux/mtd/onenand.h>
  26 #include <linux/mtd/partitions.h>
  27
  28 #include <asm/io.h>
  29
  30 /**
  31  * onenand_oob_64 - oob info for large (2KB) page
  32  */
  33 static struct nand_ecclayout onenand_oob_64 = {
  34         .eccbytes       = 20,
  35         .eccpos         = {
  36                 8, 9, 10, 11, 12,
  37                 24, 25, 26, 27, 28,
  38                 40, 41, 42, 43, 44,
  39                 56, 57, 58, 59, 60,
  40                 },
  41         .oobfree        = {
  42                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  43                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  44         }
  45 };
  46
  47 /**
  48  * onenand_oob_32 - oob info for middle (1KB) page
  49  */
  50 static struct nand_ecclayout onenand_oob_32 = {
  51         .eccbytes       = 10,
  52         .eccpos         = {
  53                 8, 9, 10, 11, 12,
  54                 24, 25, 26, 27, 28,
  55                 },
  56         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  57 };
  58
  59 static const unsigned char ffchars[] = {
  60         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  61         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  62         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  63         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
  64         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  65         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
  66         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  67         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
  68 };
  69
  70 /**
  71  * onenand_readw - [OneNAND Interface] Read OneNAND register
  72  * @param addr          address to read
  73  *
  74  * Read OneNAND register
  75  */
  76 static unsigned short onenand_readw(void __iomem *addr)
  77 {
  78         return readw(addr);
  79 }
  80
  81 /**
  82  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
  83  * @param value         value to write
  84  * @param addr          address to write
  85  *
  86  * Write OneNAND register with value
  87  */
  88 static void onenand_writew(unsigned short value, void __iomem *addr)
  89 {
  90         writew(value, addr);
  91 }
  92
  93 /**
  94  * onenand_block_address - [DEFAULT] Get block address
  95  * @param this          onenand chip data structure
  96  * @param block         the block
  97  * @return              translated block address if DDP, otherwise same
  98  *
  99  * Setup Start Address 1 Register (F100h)
 100  */
 101 static int onenand_block_address(struct onenand_chip *this, int block)
 102 {
 103         /* Device Flash Core select, NAND Flash Block Address */
 104         if (block & this->density_mask)
 105                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 106
 107         return block;
 108 }
 109
 110 /**
 111  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 112  * @param this          onenand chip data structure
 113  * @param block         the block
 114  * @return              set DBS value if DDP, otherwise 0
 115  *
 116  * Setup Start Address 2 Register (F101h) for DDP
 117  */
 118 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 119 {
 120         /* Device BufferRAM Select */
 121         if (block & this->density_mask)
 122                 return ONENAND_DDP_CHIP1;
 123
 124         return ONENAND_DDP_CHIP0;
 125 }
 126
 127 /**
 128  * onenand_page_address - [DEFAULT] Get page address
 129  * @param page          the page address
 130  * @param sector        the sector address
 131  * @return              combined page and sector address
 132  *
 133  * Setup Start Address 8 Register (F107h)
 134  */
 135 static int onenand_page_address(int page, int sector)
 136 {
 137         /* Flash Page Address, Flash Sector Address */
 138         int fpa, fsa;
 139
 140         fpa = page & ONENAND_FPA_MASK;
 141         fsa = sector & ONENAND_FSA_MASK;
 142
 143         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 144 }
 145
 146 /**
 147  * onenand_buffer_address - [DEFAULT] Get buffer address
 148  * @param dataram1      DataRAM index
 149  * @param sectors       the sector address
 150  * @param count         the number of sectors
 151  * @return              the start buffer value
 152  *
 153  * Setup Start Buffer Register (F200h)
 154  */
 155 static int onenand_buffer_address(int dataram1, int sectors, int count)
 156 {
 157         int bsa, bsc;
 158
 159         /* BufferRAM Sector Address */
 160         bsa = sectors & ONENAND_BSA_MASK;
 161
 162         if (dataram1)
 163                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 164         else
 165                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 166
 167         /* BufferRAM Sector Count */
 168         bsc = count & ONENAND_BSC_MASK;
 169
 170         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 171 }
 172
 173 /**
 174  * onenand_get_density - [DEFAULT] Get OneNAND density
 175  * @param dev_id        OneNAND device ID
 176  *
 177  * Get OneNAND density from device ID
 178  */
 179 static inline int onenand_get_density(int dev_id)
 180 {
 181         int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 182         return (density & ONENAND_DEVICE_DENSITY_MASK);
 183 }
 184
 185 /**
 186  * onenand_command - [DEFAULT] Send command to OneNAND device
 187  * @param mtd           MTD device structure
 188  * @param cmd           the command to be sent
 189  * @param addr          offset to read from or write to
 190  * @param len           number of bytes to read or write
 191  *
 192  * Send command to OneNAND device. This function is used for middle/large page
 193  * devices (1KB/2KB Bytes per page)
 194  */
 195 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 196 {
 197         struct onenand_chip *this = mtd->priv;
 198         int value, block, page;
 199
 200         /* Address translation */
 201         switch (cmd) {
 202         case ONENAND_CMD_UNLOCK:
 203         case ONENAND_CMD_LOCK:
 204         case ONENAND_CMD_LOCK_TIGHT:
 205         case ONENAND_CMD_UNLOCK_ALL:
 206                 block = -1;
 207                 page = -1;
 208                 break;
 209
 210         case ONENAND_CMD_ERASE:
 211         case ONENAND_CMD_BUFFERRAM:
 212         case ONENAND_CMD_OTP_ACCESS:
 213                 block = (int) (addr >> this->erase_shift);
 214                 page = -1;
 215                 break;
 216
 217         default:
 218                 block = (int) (addr >> this->erase_shift);
 219                 page = (int) (addr >> this->page_shift);
 220
 221                 if (ONENAND_IS_2PLANE(this)) {
 222                         /* Make the even block number */
 223                         block &= ~1;
 224                         /* Is it the odd plane? */
 225                         if (addr & this->writesize)
 226                                 block++;
 227                         page >>= 1;
 228                 }
 229                 page &= this->page_mask;
 230                 break;
 231         }
 232
 233         /* NOTE: The setting order of the registers is very important! */
 234         if (cmd == ONENAND_CMD_BUFFERRAM) {
 235                 /* Select DataRAM for DDP */
 236                 value = onenand_bufferram_address(this, block);
 237                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 238
 239                 if (ONENAND_IS_2PLANE(this))
 240                         /* It is always BufferRAM0 */
 241                         ONENAND_SET_BUFFERRAM0(this);
 242                 else
 243                         /* Switch to the next data buffer */
 244                         ONENAND_SET_NEXT_BUFFERRAM(this);
 245
 246                 return 0;
 247         }
 248
 249         if (block != -1) {
 250                 /* Write 'DFS, FBA' of Flash */
 251                 value = onenand_block_address(this, block);
 252                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 253
 254                 /* Select DataRAM for DDP */
 255                 value = onenand_bufferram_address(this, block);
 256                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 257         }
 258
 259         if (page != -1) {
 260                 /* Now we use page size operation */
 261                 int sectors = 4, count = 4;
 262                 int dataram;
 263
 264                 switch (cmd) {
 265                 case ONENAND_CMD_READ:
 266                 case ONENAND_CMD_READOOB:
 267                         dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 268                         break;
 269
 270                 default:
 271                         if (ONENAND_IS_2PLANE(this) && cmd == ONENAND_CMD_PROG)
 272                                 cmd = ONENAND_CMD_2X_PROG;
 273                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 274                         break;
 275                 }
 276
 277                 /* Write 'FPA, FSA' of Flash */
 278                 value = onenand_page_address(page, sectors);
 279                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 280
 281                 /* Write 'BSA, BSC' of DataRAM */
 282                 value = onenand_buffer_address(dataram, sectors, count);
 283                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 284         }
 285
 286         /* Interrupt clear */
 287         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 288
 289         /* Write command */
 290         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 291
 292         return 0;
 293 }
 294
 295 /**
 296  * onenand_wait - [DEFAULT] wait until the command is done
 297  * @param mtd           MTD device structure
 298  * @param state         state to select the max. timeout value
 299  *
 300  * Wait for command done. This applies to all OneNAND command
 301  * Read can take up to 30us, erase up to 2ms and program up to 350us
 302  * according to general OneNAND specs
 303  */
 304 static int onenand_wait(struct mtd_info *mtd, int state)
 305 {
 306         struct onenand_chip * this = mtd->priv;
 307         unsigned long timeout;
 308         unsigned int flags = ONENAND_INT_MASTER;
 309         unsigned int interrupt = 0;
 310         unsigned int ctrl;
 311
 312         /* The 20 msec is enough */
 313         timeout = jiffies + msecs_to_jiffies(20);
 314         while (time_before(jiffies, timeout)) {
 315                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 316
 317                 if (interrupt & flags)
 318                         break;
 319
 320                 if (state != FL_READING)
 321                         cond_resched();
 322         }
 323         /* To get correct interrupt status in timeout case */
 324         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 325
 326         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 327
 328         if (ctrl & ONENAND_CTRL_ERROR) {
 329                 printk(KERN_ERR "onenand_wait: controller error = 0x%04x\n", ctrl);
 330                 if (ctrl & ONENAND_CTRL_LOCK)
 331                         printk(KERN_ERR "onenand_wait: it's locked error.\n");
 332                 return -EIO;
 333         }
 334
 335         if (interrupt & ONENAND_INT_READ) {
 336                 int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 337                 if (ecc) {
 338                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 339                                 printk(KERN_ERR "onenand_wait: ECC error = 0x%04x\n", ecc);
 340                                 mtd->ecc_stats.failed++;
 341                                 return -EBADMSG;
 342                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 343                                 printk(KERN_INFO "onenand_wait: correctable ECC error = 0x%04x\n", ecc);
 344                                 mtd->ecc_stats.corrected++;
 345                         }
 346                 }
 347         } else if (state == FL_READING) {
 348                 printk(KERN_ERR "onenand_wait: read timeout! ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
 349                 return -EIO;
 350         }
 351
 352         return 0;
 353 }
 354
 355 /*
 356  * onenand_interrupt - [DEFAULT] onenand interrupt handler
 357  * @param irq           onenand interrupt number
 358  * @param dev_id        interrupt data
 359  *
 360  * complete the work
 361  */
 362 static irqreturn_t onenand_interrupt(int irq, void *data)
 363 {
 364         struct onenand_chip *this = data;
 365
 366         /* To handle shared interrupt */
 367         if (!this->complete.done)
 368                 complete(&this->complete);
 369
 370         return IRQ_HANDLED;
 371 }
 372
 373 /*
 374  * onenand_interrupt_wait - [DEFAULT] wait until the command is done
 375  * @param mtd           MTD device structure
 376  * @param state         state to select the max. timeout value
 377  *
 378  * Wait for command done.
 379  */
 380 static int onenand_interrupt_wait(struct mtd_info *mtd, int state)
 381 {
 382         struct onenand_chip *this = mtd->priv;
 383
 384         wait_for_completion(&this->complete);
 385
 386         return onenand_wait(mtd, state);
 387 }
 388
 389 /*
 390  * onenand_try_interrupt_wait - [DEFAULT] try interrupt wait
 391  * @param mtd           MTD device structure
 392  * @param state         state to select the max. timeout value
 393  *
 394  * Try interrupt based wait (It is used one-time)
 395  */
 396 static int onenand_try_interrupt_wait(struct mtd_info *mtd, int state)
 397 {
 398         struct onenand_chip *this = mtd->priv;
 399         unsigned long remain, timeout;
 400
 401         /* We use interrupt wait first */
 402         this->wait = onenand_interrupt_wait;
 403
 404         timeout = msecs_to_jiffies(100);
 405         remain = wait_for_completion_timeout(&this->complete, timeout);
 406         if (!remain) {
 407                 printk(KERN_INFO "OneNAND: There's no interrupt. "
 408                                 "We use the normal wait\n");
 409
 410                 /* Release the irq */
 411                 free_irq(this->irq, this);
 412
 413                 this->wait = onenand_wait;
 414         }
 415
 416         return onenand_wait(mtd, state);
 417 }
 418
 419 /*
 420  * onenand_setup_wait - [OneNAND Interface] setup onenand wait method
 421  * @param mtd           MTD device structure
 422  *
 423  * There's two method to wait onenand work
 424  * 1. polling - read interrupt status register
 425  * 2. interrupt - use the kernel interrupt method
 426  */
 427 static void onenand_setup_wait(struct mtd_info *mtd)
 428 {
 429         struct onenand_chip *this = mtd->priv;
 430         int syscfg;
 431
 432         init_completion(&this->complete);
 433
 434         if (this->irq <= 0) {
 435                 this->wait = onenand_wait;
 436                 return;
 437         }
 438
 439         if (request_irq(this->irq, &onenand_interrupt,
 440                                 IRQF_SHARED, "onenand", this)) {
 441                 /* If we can't get irq, use the normal wait */
 442                 this->wait = onenand_wait;
 443                 return;
 444         }
 445
 446         /* Enable interrupt */
 447         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
 448         syscfg |= ONENAND_SYS_CFG1_IOBE;
 449         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
 450
 451         this->wait = onenand_try_interrupt_wait;
 452 }
 453
 454 /**
 455  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 456  * @param mtd           MTD data structure
 457  * @param area          BufferRAM area
 458  * @return              offset given area
 459  *
 460  * Return BufferRAM offset given area
 461  */
 462 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 463 {
 464         struct onenand_chip *this = mtd->priv;
 465
 466         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 467                 /* Note: the 'this->writesize' is a real page size */
 468                 if (area == ONENAND_DATARAM)
 469                         return this->writesize;
 470                 if (area == ONENAND_SPARERAM)
 471                         return mtd->oobsize;
 472         }
 473
 474         return 0;
 475 }
 476
 477 /**
 478  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 479  * @param mtd           MTD data structure
 480  * @param area          BufferRAM area
 481  * @param buffer        the databuffer to put/get data
 482  * @param offset        offset to read from or write to
 483  * @param count         number of bytes to read/write
 484  *
 485  * Read the BufferRAM area
 486  */
 487 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 488                 unsigned char *buffer, int offset, size_t count)
 489 {
 490         struct onenand_chip *this = mtd->priv;
 491         void __iomem *bufferram;
 492
 493         bufferram = this->base + area;
 494
 495         bufferram += onenand_bufferram_offset(mtd, area);
 496
 497         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 498                 unsigned short word;
 499
 500                 /* Align with word(16-bit) size */
 501                 count--;
 502
 503                 /* Read word and save byte */
 504                 word = this->read_word(bufferram + offset + count);
 505                 buffer[count] = (word & 0xff);
 506         }
 507
 508         memcpy(buffer, bufferram + offset, count);
 509
 510         return 0;
 511 }
 512
 513 /**
 514  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 515  * @param mtd           MTD data structure
 516  * @param area          BufferRAM area
 517  * @param buffer        the databuffer to put/get data
 518  * @param offset        offset to read from or write to
 519  * @param count         number of bytes to read/write
 520  *
 521  * Read the BufferRAM area with Sync. Burst Mode
 522  */
 523 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 524                 unsigned char *buffer, int offset, size_t count)
 525 {
 526         struct onenand_chip *this = mtd->priv;
 527         void __iomem *bufferram;
 528
 529         bufferram = this->base + area;
 530
 531         bufferram += onenand_bufferram_offset(mtd, area);
 532
 533         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 534
 535         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 536                 unsigned short word;
 537
 538                 /* Align with word(16-bit) size */
 539                 count--;
 540
 541                 /* Read word and save byte */
 542                 word = this->read_word(bufferram + offset + count);
 543                 buffer[count] = (word & 0xff);
 544         }
 545
 546         memcpy(buffer, bufferram + offset, count);
 547
 548         this->mmcontrol(mtd, 0);
 549
 550         return 0;
 551 }
 552
 553 /**
 554  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 555  * @param mtd           MTD data structure
 556  * @param area          BufferRAM area
 557  * @param buffer        the databuffer to put/get data
 558  * @param offset        offset to read from or write to
 559  * @param count         number of bytes to read/write
 560  *
 561  * Write the BufferRAM area
 562  */
 563 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 564                 const unsigned char *buffer, int offset, size_t count)
 565 {
 566         struct onenand_chip *this = mtd->priv;
 567         void __iomem *bufferram;
 568
 569         bufferram = this->base + area;
 570
 571         bufferram += onenand_bufferram_offset(mtd, area);
 572
 573         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 574                 unsigned short word;
 575                 int byte_offset;
 576
 577                 /* Align with word(16-bit) size */
 578                 count--;
 579
 580                 /* Calculate byte access offset */
 581                 byte_offset = offset + count;
 582
 583                 /* Read word and save byte */
 584                 word = this->read_word(bufferram + byte_offset);
 585                 word = (word & ~0xff) | buffer[count];
 586                 this->write_word(word, bufferram + byte_offset);
 587         }
 588
 589         memcpy(bufferram + offset, buffer, count);
 590
 591         return 0;
 592 }
 593
 594 /**
 595  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 596  * @param mtd           MTD data structure
 597  * @param addr          address to check
 598  * @return              blockpage address
 599  *
 600  * Get blockpage address at 2x program mode
 601  */
 602 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 603 {
 604         struct onenand_chip *this = mtd->priv;
 605         int blockpage, block, page;
 606
 607         /* Calculate the even block number */
 608         block = (int) (addr >> this->erase_shift) & ~1;
 609         /* Is it the odd plane? */
 610         if (addr & this->writesize)
 611                 block++;
 612         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 613         blockpage = (block << 7) | page;
 614
 615         return blockpage;
 616 }
 617
 618 /**
 619  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 620  * @param mtd           MTD data structure
 621  * @param addr          address to check
 622  * @return              1 if there are valid data, otherwise 0
 623  *
 624  * Check bufferram if there is data we required
 625  */
 626 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 627 {
 628         struct onenand_chip *this = mtd->priv;
 629         int blockpage, found = 0;
 630         unsigned int i;
 631
 632         if (ONENAND_IS_2PLANE(this))
 633                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 634         else
 635                 blockpage = (int) (addr >> this->page_shift);
 636
 637         /* Is there valid data? */
 638         i = ONENAND_CURRENT_BUFFERRAM(this);
 639         if (this->bufferram[i].blockpage == blockpage)
 640                 found = 1;
 641         else {
 642                 /* Check another BufferRAM */
 643                 i = ONENAND_NEXT_BUFFERRAM(this);
 644                 if (this->bufferram[i].blockpage == blockpage) {
 645                         ONENAND_SET_NEXT_BUFFERRAM(this);
 646                         found = 1;
 647                 }
 648         }
 649
 650         if (found && ONENAND_IS_DDP(this)) {
 651                 /* Select DataRAM for DDP */
 652                 int block = (int) (addr >> this->erase_shift);
 653                 int value = onenand_bufferram_address(this, block);
 654                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 655         }
 656
 657         return found;
 658 }
 659
 660 /**
 661  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 662  * @param mtd           MTD data structure
 663  * @param addr          address to update
 664  * @param valid         valid flag
 665  *
 666  * Update BufferRAM information
 667  */
 668 static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 669                 int valid)
 670 {
 671         struct onenand_chip *this = mtd->priv;
 672         int blockpage;
 673         unsigned int i;
 674
 675         if (ONENAND_IS_2PLANE(this))
 676                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 677         else
 678                 blockpage = (int) (addr >> this->page_shift);
 679
 680         /* Invalidate another BufferRAM */
 681         i = ONENAND_NEXT_BUFFERRAM(this);
 682         if (this->bufferram[i].blockpage == blockpage)
 683                 this->bufferram[i].blockpage = -1;
 684
 685         /* Update BufferRAM */
 686         i = ONENAND_CURRENT_BUFFERRAM(this);
 687         if (valid)
 688                 this->bufferram[i].blockpage = blockpage;
 689         else
 690                 this->bufferram[i].blockpage = -1;
 691 }
 692
 693 /**
 694  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 695  * @param mtd           MTD data structure
 696  * @param addr          start address to invalidate
 697  * @param len           length to invalidate
 698  *
 699  * Invalidate BufferRAM information
 700  */
 701 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 702                 unsigned int len)
 703 {
 704         struct onenand_chip *this = mtd->priv;
 705         int i;
 706         loff_t end_addr = addr + len;
 707
 708         /* Invalidate BufferRAM */
 709         for (i = 0; i < MAX_BUFFERRAM; i++) {
 710                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 711                 if (buf_addr >= addr && buf_addr < end_addr)
 712                         this->bufferram[i].blockpage = -1;
 713         }
 714 }
 715
 716 /**
 717  * onenand_get_device - [GENERIC] Get chip for selected access
 718  * @param mtd           MTD device structure
 719  * @param new_state     the state which is requested
 720  *
 721  * Get the device and lock it for exclusive access
 722  */
 723 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 724 {
 725         struct onenand_chip *this = mtd->priv;
 726         DECLARE_WAITQUEUE(wait, current);
 727
 728         /*
 729          * Grab the lock and see if the device is available
 730          */
 731         while (1) {
 732                 spin_lock(&this->chip_lock);
 733                 if (this->state == FL_READY) {
 734                         this->state = new_state;
 735                         spin_unlock(&this->chip_lock);
 736                         break;
 737                 }
 738                 if (new_state == FL_PM_SUSPENDED) {
 739                         spin_unlock(&this->chip_lock);
 740                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 741                 }
 742                 set_current_state(TASK_UNINTERRUPTIBLE);
 743                 add_wait_queue(&this->wq, &wait);
 744                 spin_unlock(&this->chip_lock);
 745                 schedule();
 746                 remove_wait_queue(&this->wq, &wait);
 747         }
 748
 749         return 0;
 750 }
 751
 752 /**
 753  * onenand_release_device - [GENERIC] release chip
 754  * @param mtd           MTD device structure
 755  *
 756  * Deselect, release chip lock and wake up anyone waiting on the device
 757  */
 758 static void onenand_release_device(struct mtd_info *mtd)
 759 {
 760         struct onenand_chip *this = mtd->priv;
 761
 762         /* Release the chip */
 763         spin_lock(&this->chip_lock);
 764         this->state = FL_READY;
 765         wake_up(&this->wq);
 766         spin_unlock(&this->chip_lock);
 767 }
 768
 769 /**
 770  * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
 771  * @param mtd           MTD device structure
 772  * @param buf           destination address
 773  * @param column        oob offset to read from
 774  * @param thislen       oob length to read
 775  */
 776 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,
 777                                 int thislen)
 778 {
 779         struct onenand_chip *this = mtd->priv;
 780         struct nand_oobfree *free;
 781         int readcol = column;
 782         int readend = column + thislen;
 783         int lastgap = 0;
 784         unsigned int i;
 785         uint8_t *oob_buf = this->oob_buf;
 786
 787         free = this->ecclayout->oobfree;
 788         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 789                 if (readcol >= lastgap)
 790                         readcol += free->offset - lastgap;
 791                 if (readend >= lastgap)
 792                         readend += free->offset - lastgap;
 793                 lastgap = free->offset + free->length;
 794         }
 795         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 796         free = this->ecclayout->oobfree;
 797         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 798                 int free_end = free->offset + free->length;
 799                 if (free->offset < readend && free_end > readcol) {
 800                         int st = max_t(int,free->offset,readcol);
 801                         int ed = min_t(int,free_end,readend);
 802                         int n = ed - st;
 803                         memcpy(buf, oob_buf + st, n);
 804                         buf += n;
 805                 } else if (column == 0)
 806                         break;
 807         }
 808         return 0;
 809 }
 810
 811 /**
 812  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
 813  * @param mtd           MTD device structure
 814  * @param from          offset to read from
 815  * @param ops:          oob operation description structure
 816  *
 817  * OneNAND read main and/or out-of-band data
 818  */
 819 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
 820                                 struct mtd_oob_ops *ops)
 821 {
 822         struct onenand_chip *this = mtd->priv;
 823         struct mtd_ecc_stats stats;
 824         size_t len = ops->len;
 825         size_t ooblen = ops->ooblen;
 826         u_char *buf = ops->datbuf;
 827         u_char *oobbuf = ops->oobbuf;
 828         int read = 0, column, thislen;
 829         int oobread = 0, oobcolumn, thisooblen, oobsize;
 830         int ret = 0, boundary = 0;
 831         int writesize = this->writesize;
 832
 833         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_ops_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 834
 835         if (ops->mode == MTD_OOB_AUTO)
 836                 oobsize = this->ecclayout->oobavail;
 837         else
 838                 oobsize = mtd->oobsize;
 839
 840         oobcolumn = from & (mtd->oobsize - 1);
 841
 842         /* Do not allow reads past end of device */
 843         if ((from + len) > mtd->size) {
 844                 printk(KERN_ERR "onenand_read_ops_nolock: Attempt read beyond end of device\n");
 845                 ops->retlen = 0;
 846                 ops->oobretlen = 0;
 847                 return -EINVAL;
 848         }
 849
 850         stats = mtd->ecc_stats;
 851
 852         /* Read-while-load method */
 853
 854         /* Do first load to bufferRAM */
 855         if (read < len) {
 856                 if (!onenand_check_bufferram(mtd, from)) {
 857                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 858                         ret = this->wait(mtd, FL_READING);
 859                         onenand_update_bufferram(mtd, from, !ret);
 860                         if (ret == -EBADMSG)
 861                                 ret = 0;
 862                 }
 863         }
 864
 865         thislen = min_t(int, writesize, len - read);
 866         column = from & (writesize - 1);
 867         if (column + thislen > writesize)
 868                 thislen = writesize - column;
 869
 870         while (!ret) {
 871                 /* If there is more to load then start next load */
 872                 from += thislen;
 873                 if (read + thislen < len) {
 874                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
 875                         /*
 876                          * Chip boundary handling in DDP
 877                          * Now we issued chip 1 read and pointed chip 1
 878                          * bufferam so we have to point chip 0 bufferam.
 879                          */
 880                         if (ONENAND_IS_DDP(this) &&
 881                             unlikely(from == (this->chipsize >> 1))) {
 882                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
 883                                 boundary = 1;
 884                         } else
 885                                 boundary = 0;
 886                         ONENAND_SET_PREV_BUFFERRAM(this);
 887                 }
 888                 /* While load is going, read from last bufferRAM */
 889                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
 890
 891                 /* Read oob area if needed */
 892                 if (oobbuf) {
 893                         thisooblen = oobsize - oobcolumn;
 894                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
 895
 896                         if (ops->mode == MTD_OOB_AUTO)
 897                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
 898                         else
 899                                 this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
 900                         oobread += thisooblen;
 901                         oobbuf += thisooblen;
 902                         oobcolumn = 0;
 903                 }
 904
 905                 /* See if we are done */
 906                 read += thislen;
 907                 if (read == len)
 908                         break;
 909                 /* Set up for next read from bufferRAM */
 910                 if (unlikely(boundary))
 911                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
 912                 ONENAND_SET_NEXT_BUFFERRAM(this);
 913                 buf += thislen;
 914                 thislen = min_t(int, writesize, len - read);
 915                 column = 0;
 916                 cond_resched();
 917                 /* Now wait for load */
 918                 ret = this->wait(mtd, FL_READING);
 919                 onenand_update_bufferram(mtd, from, !ret);
 920                 if (ret == -EBADMSG)
 921                         ret = 0;
 922         }
 923
 924         /*
 925          * Return success, if no ECC failures, else -EBADMSG
 926          * fs driver will take care of that, because
 927          * retlen == desired len and result == -EBADMSG
 928          */
 929         ops->retlen = read;
 930         ops->oobretlen = oobread;
 931
 932         if (ret)
 933                 return ret;
 934
 935         if (mtd->ecc_stats.failed - stats.failed)
 936                 return -EBADMSG;
 937
 938         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
 939 }
 940
 941 /**
 942  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
 943  * @param mtd           MTD device structure
 944  * @param from          offset to read from
 945  * @param ops:          oob operation description structure
 946  *
 947  * OneNAND read out-of-band data from the spare area
 948  */
 949 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
 950                         struct mtd_oob_ops *ops)
 951 {
 952         struct onenand_chip *this = mtd->priv;
 953         struct mtd_ecc_stats stats;
 954         int read = 0, thislen, column, oobsize;
 955         size_t len = ops->ooblen;
 956         mtd_oob_mode_t mode = ops->mode;
 957         u_char *buf = ops->oobbuf;
 958         int ret = 0;
 959
 960         from += ops->ooboffs;
 961
 962         DEBUG(MTD_DEBUG_LEVEL3, "onenand_read_oob_nolock: from = 0x%08x, len = %i\n", (unsigned int) from, (int) len);
 963
 964         /* Initialize return length value */
 965         ops->oobretlen = 0;
 966
 967         if (mode == MTD_OOB_AUTO)
 968                 oobsize = this->ecclayout->oobavail;
 969         else
 970                 oobsize = mtd->oobsize;
 971
 972         column = from & (mtd->oobsize - 1);
 973
 974         if (unlikely(column >= oobsize)) {
 975                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to start read outside oob\n");
 976                 return -EINVAL;
 977         }
 978
 979         /* Do not allow reads past end of device */
 980         if (unlikely(from >= mtd->size ||
 981                      column + len > ((mtd->size >> this->page_shift) -
 982                                      (from >> this->page_shift)) * oobsize)) {
 983                 printk(KERN_ERR "onenand_read_oob_nolock: Attempted to read beyond end of device\n");
 984                 return -EINVAL;
 985         }
 986
 987         stats = mtd->ecc_stats;
 988
 989         while (read < len) {
 990                 cond_resched();
 991
 992                 thislen = oobsize - column;
 993                 thislen = min_t(int, thislen, len);
 994
 995                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
 996
 997                 onenand_update_bufferram(mtd, from, 0);
 998
 999                 ret = this->wait(mtd, FL_READING);
1000                 if (ret && ret != -EBADMSG) {
1001                         printk(KERN_ERR "onenand_read_oob_nolock: read failed = 0x%x\n", ret);
1002                         break;
1003                 }
1004
1005                 if (mode == MTD_OOB_AUTO)
1006                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
1007                 else
1008                         this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1009
1010                 read += thislen;
1011
1012                 if (read == len)
1013                         break;
1014
1015                 buf += thislen;
1016
1017                 /* Read more? */
1018                 if (read < len) {
1019                         /* Page size */
1020                         from += mtd->writesize;
1021                         column = 0;
1022                 }
1023         }
1024
1025         ops->oobretlen = read;
1026
1027         if (ret)
1028                 return ret;
1029
1030         if (mtd->ecc_stats.failed - stats.failed)
1031                 return -EBADMSG;
1032
1033         return 0;
1034 }
1035
1036 /**
1037  * onenand_read - [MTD Interface] Read data from flash
1038  * @param mtd           MTD device structure
1039  * @param from          offset to read from
1040  * @param len           number of bytes to read
1041  * @param retlen        pointer to variable to store the number of read bytes
1042  * @param buf           the databuffer to put data
1043  *
1044  * Read with ecc
1045 */
1046 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
1047         size_t *retlen, u_char *buf)
1048 {
1049         struct mtd_oob_ops ops = {
1050                 .len    = len,
1051                 .ooblen = 0,
1052                 .datbuf = buf,
1053                 .oobbuf = NULL,
1054         };
1055         int ret;
1056
1057         onenand_get_device(mtd, FL_READING);
1058         ret = onenand_read_ops_nolock(mtd, from, &ops);
1059         onenand_release_device(mtd);
1060
1061         *retlen = ops.retlen;
1062         return ret;
1063 }
1064
1065 /**
1066  * onenand_read_oob - [MTD Interface] Read main and/or out-of-band
1067  * @param mtd:          MTD device structure
1068  * @param from:         offset to read from
1069  * @param ops:          oob operation description structure
1070
1071  * Read main and/or out-of-band
1072  */
1073 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
1074                             struct mtd_oob_ops *ops)
1075 {
1076         int ret;
1077
1078         switch (ops->mode) {
1079         case MTD_OOB_PLACE:
1080         case MTD_OOB_AUTO:
1081                 break;
1082         case MTD_OOB_RAW:
1083                 /* Not implemented yet */
1084         default:
1085                 return -EINVAL;
1086         }
1087
1088         onenand_get_device(mtd, FL_READING);
1089         if (ops->datbuf)
1090                 ret = onenand_read_ops_nolock(mtd, from, ops);
1091         else
1092                 ret = onenand_read_oob_nolock(mtd, from, ops);
1093         onenand_release_device(mtd);
1094
1095         return ret;
1096 }
1097
1098 /**
1099  * onenand_bbt_wait - [DEFAULT] wait until the command is done
1100  * @param mtd           MTD device structure
1101  * @param state         state to select the max. timeout value
1102  *
1103  * Wait for command done.
1104  */
1105 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
1106 {
1107         struct onenand_chip *this = mtd->priv;
1108         unsigned long timeout;
1109         unsigned int interrupt;
1110         unsigned int ctrl;
1111
1112         /* The 20 msec is enough */
1113         timeout = jiffies + msecs_to_jiffies(20);
1114         while (time_before(jiffies, timeout)) {
1115                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1116                 if (interrupt & ONENAND_INT_MASTER)
1117                         break;
1118         }
1119         /* To get correct interrupt status in timeout case */
1120         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1121         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
1122
1123         /* Initial bad block case: 0x2400 or 0x0400 */
1124         if (ctrl & ONENAND_CTRL_ERROR) {
1125                 printk(KERN_DEBUG "onenand_bbt_wait: controller error = 0x%04x\n", ctrl);
1126                 return ONENAND_BBT_READ_ERROR;
1127         }
1128
1129         if (interrupt & ONENAND_INT_READ) {
1130                 int ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS);
1131                 if (ecc & ONENAND_ECC_2BIT_ALL)
1132                         return ONENAND_BBT_READ_ERROR;
1133         } else {
1134                 printk(KERN_ERR "onenand_bbt_wait: read timeout!"
1135                         "ctrl=0x%04x intr=0x%04x\n", ctrl, interrupt);
1136                 return ONENAND_BBT_READ_FATAL_ERROR;
1137         }
1138
1139         return 0;
1140 }
1141
1142 /**
1143  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
1144  * @param mtd           MTD device structure
1145  * @param from          offset to read from
1146  * @param ops           oob operation description structure
1147  *
1148  * OneNAND read out-of-band data from the spare area for bbt scan
1149  */
1150 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
1151                             struct mtd_oob_ops *ops)
1152 {
1153         struct onenand_chip *this = mtd->priv;
1154         int read = 0, thislen, column;
1155         int ret = 0;
1156         size_t len = ops->ooblen;
1157         u_char *buf = ops->oobbuf;
1158
1159         DEBUG(MTD_DEBUG_LEVEL3, "onenand_bbt_read_oob: from = 0x%08x, len = %zi\n", (unsigned int) from, len);
1160
1161         /* Initialize return value */
1162         ops->oobretlen = 0;
1163
1164         /* Do not allow reads past end of device */
1165         if (unlikely((from + len) > mtd->size)) {
1166                 printk(KERN_ERR "onenand_bbt_read_oob: Attempt read beyond end of device\n");
1167                 return ONENAND_BBT_READ_FATAL_ERROR;
1168         }
1169
1170         /* Grab the lock and see if the device is available */
1171         onenand_get_device(mtd, FL_READING);
1172
1173         column = from & (mtd->oobsize - 1);
1174
1175         while (read < len) {
1176                 cond_resched();
1177
1178                 thislen = mtd->oobsize - column;
1179                 thislen = min_t(int, thislen, len);
1180
1181                 this->command(mtd, ONENAND_CMD_READOOB, from, mtd->oobsize);
1182
1183                 onenand_update_bufferram(mtd, from, 0);
1184
1185                 ret = onenand_bbt_wait(mtd, FL_READING);
1186                 if (ret)
1187                         break;
1188
1189                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1190                 read += thislen;
1191                 if (read == len)
1192                         break;
1193
1194                 buf += thislen;
1195
1196                 /* Read more? */
1197                 if (read < len) {
1198                         /* Update Page size */
1199                         from += this->writesize;
1200                         column = 0;
1201                 }
1202         }
1203
1204         /* Deselect and wake up anyone waiting on the device */
1205         onenand_release_device(mtd);
1206
1207         ops->oobretlen = read;
1208         return ret;
1209 }
1210
1211 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1212 /**
1213  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1214  * @param mtd           MTD device structure
1215  * @param buf           the databuffer to verify
1216  * @param to            offset to read from
1217  */
1218 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1219 {
1220         struct onenand_chip *this = mtd->priv;
1221         u_char *oob_buf = this->oob_buf;
1222         int status, i;
1223
1224         this->command(mtd, ONENAND_CMD_READOOB, to, mtd->oobsize);
1225         onenand_update_bufferram(mtd, to, 0);
1226         status = this->wait(mtd, FL_READING);
1227         if (status)
1228                 return status;
1229
1230         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1231         for (i = 0; i < mtd->oobsize; i++)
1232                 if (buf[i] != 0xFF && buf[i] != oob_buf[i])
1233                         return -EBADMSG;
1234
1235         return 0;
1236 }
1237
1238 /**
1239  * onenand_verify - [GENERIC] verify the chip contents after a write
1240  * @param mtd          MTD device structure
1241  * @param buf          the databuffer to verify
1242  * @param addr         offset to read from
1243  * @param len          number of bytes to read and compare
1244  */
1245 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1246 {
1247         struct onenand_chip *this = mtd->priv;
1248         void __iomem *dataram;
1249         int ret = 0;
1250         int thislen, column;
1251
1252         while (len != 0) {
1253                 thislen = min_t(int, this->writesize, len);
1254                 column = addr & (this->writesize - 1);
1255                 if (column + thislen > this->writesize)
1256                         thislen = this->writesize - column;
1257
1258                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1259
1260                 onenand_update_bufferram(mtd, addr, 0);
1261
1262                 ret = this->wait(mtd, FL_READING);
1263                 if (ret)
1264                         return ret;
1265
1266                 onenand_update_bufferram(mtd, addr, 1);
1267
1268                 dataram = this->base + ONENAND_DATARAM;
1269                 dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
1270
1271                 if (memcmp(buf, dataram + column, thislen))
1272                         return -EBADMSG;
1273
1274                 len -= thislen;
1275                 buf += thislen;
1276                 addr += thislen;
1277         }
1278
1279         return 0;
1280 }
1281 #else
1282 #define onenand_verify(...)             (0)
1283 #define onenand_verify_oob(...)         (0)
1284 #endif
1285
1286 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1287
1288 static void onenand_panic_wait(struct mtd_info *mtd)
1289 {
1290         struct onenand_chip *this = mtd->priv;
1291         unsigned int interrupt;
1292         int i;
1293
1294         for (i = 0; i < 2000; i++) {
1295                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1296                 if (interrupt & ONENAND_INT_MASTER)
1297                         break;
1298                 udelay(10);
1299         }
1300 }
1301
1302 /**
1303  * onenand_panic_write - [MTD Interface] write buffer to FLASH in a panic context
1304  * @param mtd           MTD device structure
1305  * @param to            offset to write to
1306  * @param len           number of bytes to write
1307  * @param retlen        pointer to variable to store the number of written bytes
1308  * @param buf           the data to write
1309  *
1310  * Write with ECC
1311  */
1312 static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
1313                          size_t *retlen, const u_char *buf)
1314 {
1315         struct onenand_chip *this = mtd->priv;
1316         int column, subpage;
1317         int written = 0;
1318         int ret = 0;
1319
1320         if (this->state == FL_PM_SUSPENDED)
1321                 return -EBUSY;
1322
1323         /* Wait for any existing operation to clear */
1324         onenand_panic_wait(mtd);
1325
1326         DEBUG(MTD_DEBUG_LEVEL3, "onenand_panic_write: to = 0x%08x, len = %i\n",
1327               (unsigned int) to, (int) len);
1328
1329         /* Initialize retlen, in case of early exit */
1330         *retlen = 0;
1331
1332         /* Do not allow writes past end of device */
1333         if (unlikely((to + len) > mtd->size)) {
1334                 printk(KERN_ERR "onenand_panic_write: Attempt write to past end of device\n");
1335                 return -EINVAL;
1336         }
1337
1338         /* Reject writes, which are not page aligned */
1339         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
1340                 printk(KERN_ERR "onenand_panic_write: Attempt to write not page aligned data\n");
1341                 return -EINVAL;
1342         }
1343
1344         column = to & (mtd->writesize - 1);
1345
1346         /* Loop until all data write */
1347         while (written < len) {
1348                 int thislen = min_t(int, mtd->writesize - column, len - written);
1349                 u_char *wbuf = (u_char *) buf;
1350
1351                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1352
1353                 /* Partial page write */
1354                 subpage = thislen < mtd->writesize;
1355                 if (subpage) {
1356                         memset(this->page_buf, 0xff, mtd->writesize);
1357                         memcpy(this->page_buf + column, buf, thislen);
1358                         wbuf = this->page_buf;
1359                 }
1360
1361                 this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1362                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
1363
1364                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1365
1366                 onenand_panic_wait(mtd);
1367
1368                 /* In partial page write we don't update bufferram */
1369                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1370                 if (ONENAND_IS_2PLANE(this)) {
1371                         ONENAND_SET_BUFFERRAM1(this);
1372                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1373                 }
1374
1375                 if (ret) {
1376                         printk(KERN_ERR "onenand_panic_write: write failed %d\n", ret);
1377                         break;
1378                 }
1379
1380                 written += thislen;
1381
1382                 if (written == len)
1383                         break;
1384
1385                 column = 0;
1386                 to += thislen;
1387                 buf += thislen;
1388         }
1389
1390         *retlen = written;
1391         return ret;
1392 }
1393
1394 /**
1395  * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
1396  * @param mtd           MTD device structure
1397  * @param oob_buf       oob buffer
1398  * @param buf           source address
1399  * @param column        oob offset to write to
1400  * @param thislen       oob length to write
1401  */
1402 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1403                                   const u_char *buf, int column, int thislen)
1404 {
1405         struct onenand_chip *this = mtd->priv;
1406         struct nand_oobfree *free;
1407         int writecol = column;
1408         int writeend = column + thislen;
1409         int lastgap = 0;
1410         unsigned int i;
1411
1412         free = this->ecclayout->oobfree;
1413         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1414                 if (writecol >= lastgap)
1415                         writecol += free->offset - lastgap;
1416                 if (writeend >= lastgap)
1417                         writeend += free->offset - lastgap;
1418                 lastgap = free->offset + free->length;
1419         }
1420         free = this->ecclayout->oobfree;
1421         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1422                 int free_end = free->offset + free->length;
1423                 if (free->offset < writeend && free_end > writecol) {
1424                         int st = max_t(int,free->offset,writecol);
1425                         int ed = min_t(int,free_end,writeend);
1426                         int n = ed - st;
1427                         memcpy(oob_buf + st, buf, n);
1428                         buf += n;
1429                 } else if (column == 0)
1430                         break;
1431         }
1432         return 0;
1433 }
1434
1435 /**
1436  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1437  * @param mtd           MTD device structure
1438  * @param to            offset to write to
1439  * @param ops           oob operation description structure
1440  *
1441  * Write main and/or oob with ECC
1442  */
1443 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1444                                 struct mtd_oob_ops *ops)
1445 {
1446         struct onenand_chip *this = mtd->priv;
1447         int written = 0, column, thislen, subpage;
1448         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1449         size_t len = ops->len;
1450         size_t ooblen = ops->ooblen;
1451         const u_char *buf = ops->datbuf;
1452         const u_char *oob = ops->oobbuf;
1453         u_char *oobbuf;
1454         int ret = 0;
1455
1456         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_ops_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1457
1458         /* Initialize retlen, in case of early exit */
1459         ops->retlen = 0;
1460         ops->oobretlen = 0;
1461
1462         /* Do not allow writes past end of device */
1463         if (unlikely((to + len) > mtd->size)) {
1464                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt write to past end of device\n");
1465                 return -EINVAL;
1466         }
1467
1468         /* Reject writes, which are not page aligned */
1469         if (unlikely(NOTALIGNED(to)) || unlikely(NOTALIGNED(len))) {
1470                 printk(KERN_ERR "onenand_write_ops_nolock: Attempt to write not page aligned data\n");
1471                 return -EINVAL;
1472         }
1473
1474         if (ops->mode == MTD_OOB_AUTO)
1475                 oobsize = this->ecclayout->oobavail;
1476         else
1477                 oobsize = mtd->oobsize;
1478
1479         oobcolumn = to & (mtd->oobsize - 1);
1480
1481         column = to & (mtd->writesize - 1);
1482
1483         /* Loop until all data write */
1484         while (written < len) {
1485                 u_char *wbuf = (u_char *) buf;
1486
1487                 thislen = min_t(int, mtd->writesize - column, len - written);
1488                 thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1489
1490                 cond_resched();
1491
1492                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1493
1494                 /* Partial page write */
1495                 subpage = thislen < mtd->writesize;
1496                 if (subpage) {
1497                         memset(this->page_buf, 0xff, mtd->writesize);
1498                         memcpy(this->page_buf + column, buf, thislen);
1499                         wbuf = this->page_buf;
1500                 }
1501
1502                 this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1503
1504                 if (oob) {
1505                         oobbuf = this->oob_buf;
1506
1507                         /* We send data to spare ram with oobsize
1508                          * to prevent byte access */
1509                         memset(oobbuf, 0xff, mtd->oobsize);
1510                         if (ops->mode == MTD_OOB_AUTO)
1511                                 onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1512                         else
1513                                 memcpy(oobbuf + oobcolumn, oob, thisooblen);
1514
1515                         oobwritten += thisooblen;
1516                         oob += thisooblen;
1517                         oobcolumn = 0;
1518                 } else
1519                         oobbuf = (u_char *) ffchars;
1520
1521                 this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1522
1523                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1524
1525                 ret = this->wait(mtd, FL_WRITING);
1526
1527                 /* In partial page write we don't update bufferram */
1528                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1529                 if (ONENAND_IS_2PLANE(this)) {
1530                         ONENAND_SET_BUFFERRAM1(this);
1531                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1532                 }
1533
1534                 if (ret) {
1535                         printk(KERN_ERR "onenand_write_ops_nolock: write filaed %d\n", ret);
1536                         break;
1537                 }
1538
1539                 /* Only check verify write turn on */
1540                 ret = onenand_verify(mtd, buf, to, thislen);
1541                 if (ret) {
1542                         printk(KERN_ERR "onenand_write_ops_nolock: verify failed %d\n", ret);
1543                         break;
1544                 }
1545
1546                 written += thislen;
1547
1548                 if (written == len)
1549                         break;
1550
1551                 column = 0;
1552                 to += thislen;
1553                 buf += thislen;
1554         }
1555
1556         ops->retlen = written;
1557
1558         return ret;
1559 }
1560
1561
1562 /**
1563  * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
1564  * @param mtd           MTD device structure
1565  * @param to            offset to write to
1566  * @param len           number of bytes to write
1567  * @param retlen        pointer to variable to store the number of written bytes
1568  * @param buf           the data to write
1569  * @param mode          operation mode
1570  *
1571  * OneNAND write out-of-band
1572  */
1573 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
1574                                     struct mtd_oob_ops *ops)
1575 {
1576         struct onenand_chip *this = mtd->priv;
1577         int column, ret = 0, oobsize;
1578         int written = 0;
1579         u_char *oobbuf;
1580         size_t len = ops->ooblen;
1581         const u_char *buf = ops->oobbuf;
1582         mtd_oob_mode_t mode = ops->mode;
1583
1584         to += ops->ooboffs;
1585
1586         DEBUG(MTD_DEBUG_LEVEL3, "onenand_write_oob_nolock: to = 0x%08x, len = %i\n", (unsigned int) to, (int) len);
1587
1588         /* Initialize retlen, in case of early exit */
1589         ops->oobretlen = 0;
1590
1591         if (mode == MTD_OOB_AUTO)
1592                 oobsize = this->ecclayout->oobavail;
1593         else
1594                 oobsize = mtd->oobsize;
1595
1596         column = to & (mtd->oobsize - 1);
1597
1598         if (unlikely(column >= oobsize)) {
1599                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to start write outside oob\n");
1600                 return -EINVAL;
1601         }
1602
1603         /* For compatibility with NAND: Do not allow write past end of page */
1604         if (unlikely(column + len > oobsize)) {
1605                 printk(KERN_ERR "onenand_write_oob_nolock: "
1606                       "Attempt to write past end of page\n");
1607                 return -EINVAL;
1608         }
1609
1610         /* Do not allow reads past end of device */
1611         if (unlikely(to >= mtd->size ||
1612                      column + len > ((mtd->size >> this->page_shift) -
1613                                      (to >> this->page_shift)) * oobsize)) {
1614                 printk(KERN_ERR "onenand_write_oob_nolock: Attempted to write past end of device\n");
1615                 return -EINVAL;
1616         }
1617
1618         oobbuf = this->oob_buf;
1619
1620         /* Loop until all data write */
1621         while (written < len) {
1622                 int thislen = min_t(int, oobsize, len - written);
1623
1624                 cond_resched();
1625
1626                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
1627
1628                 /* We send data to spare ram with oobsize
1629                  * to prevent byte access */
1630                 memset(oobbuf, 0xff, mtd->oobsize);
1631                 if (mode == MTD_OOB_AUTO)
1632                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
1633                 else
1634                         memcpy(oobbuf + column, buf, thislen);
1635                 this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1636
1637                 this->command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
1638
1639                 onenand_update_bufferram(mtd, to, 0);
1640                 if (ONENAND_IS_2PLANE(this)) {
1641                         ONENAND_SET_BUFFERRAM1(this);
1642                         onenand_update_bufferram(mtd, to + this->writesize, 0);
1643                 }
1644
1645                 ret = this->wait(mtd, FL_WRITING);
1646                 if (ret) {
1647                         printk(KERN_ERR "onenand_write_oob_nolock: write failed %d\n", ret);
1648                         break;
1649                 }
1650
1651                 ret = onenand_verify_oob(mtd, oobbuf, to);
1652                 if (ret) {
1653                         printk(KERN_ERR "onenand_write_oob_nolock: verify failed %d\n", ret);
1654                         break;
1655                 }
1656
1657                 written += thislen;
1658                 if (written == len)
1659                         break;
1660
1661                 to += mtd->writesize;
1662                 buf += thislen;
1663                 column = 0;
1664         }
1665
1666         ops->oobretlen = written;
1667
1668         return ret;
1669 }
1670
1671 /**
1672  * onenand_write - [MTD Interface] write buffer to FLASH
1673  * @param mtd           MTD device structure
1674  * @param to            offset to write to
1675  * @param len           number of bytes to write
1676  * @param retlen        pointer to variable to store the number of written bytes
1677  * @param buf           the data to write
1678  *
1679  * Write with ECC
1680  */
1681 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
1682         size_t *retlen, const u_char *buf)
1683 {
1684         struct mtd_oob_ops ops = {
1685                 .len    = len,
1686                 .ooblen = 0,
1687                 .datbuf = (u_char *) buf,
1688                 .oobbuf = NULL,
1689         };
1690         int ret;
1691
1692         onenand_get_device(mtd, FL_WRITING);
1693         ret = onenand_write_ops_nolock(mtd, to, &ops);
1694         onenand_release_device(mtd);
1695
1696         *retlen = ops.retlen;
1697         return ret;
1698 }
1699
1700 /**
1701  * onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band
1702  * @param mtd:          MTD device structure
1703  * @param to:           offset to write
1704  * @param ops:          oob operation description structure
1705  */
1706 static int onenand_write_oob(struct mtd_info *mtd, loff_t to,
1707                              struct mtd_oob_ops *ops)
1708 {
1709         int ret;
1710
1711         switch (ops->mode) {
1712         case MTD_OOB_PLACE:
1713         case MTD_OOB_AUTO:
1714                 break;
1715         case MTD_OOB_RAW:
1716                 /* Not implemented yet */
1717         default:
1718                 return -EINVAL;
1719         }
1720
1721         onenand_get_device(mtd, FL_WRITING);
1722         if (ops->datbuf)
1723                 ret = onenand_write_ops_nolock(mtd, to, ops);
1724         else
1725                 ret = onenand_write_oob_nolock(mtd, to, ops);
1726         onenand_release_device(mtd);
1727
1728         return ret;
1729 }
1730
1731 /**
1732  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
1733  * @param mtd           MTD device structure
1734  * @param ofs           offset from device start
1735  * @param allowbbt      1, if its allowed to access the bbt area
1736  *
1737  * Check, if the block is bad. Either by reading the bad block table or
1738  * calling of the scan function.
1739  */
1740 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
1741 {
1742         struct onenand_chip *this = mtd->priv;
1743         struct bbm_info *bbm = this->bbm;
1744
1745         /* Return info from the table */
1746         return bbm->isbad_bbt(mtd, ofs, allowbbt);
1747 }
1748
1749 /**
1750  * onenand_erase - [MTD Interface] erase block(s)
1751  * @param mtd           MTD device structure
1752  * @param instr         erase instruction
1753  *
1754  * Erase one ore more blocks
1755  */
1756 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
1757 {
1758         struct onenand_chip *this = mtd->priv;
1759         unsigned int block_size;
1760         loff_t addr;
1761         int len;
1762         int ret = 0;
1763
1764         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%08x, len = %i\n", (unsigned int) instr->addr, (unsigned int) instr->len);
1765
1766         block_size = (1 << this->erase_shift);
1767
1768         /* Start address must align on block boundary */
1769         if (unlikely(instr->addr & (block_size - 1))) {
1770                 printk(KERN_ERR "onenand_erase: Unaligned address\n");
1771                 return -EINVAL;
1772         }
1773
1774         /* Length must align on block boundary */
1775         if (unlikely(instr->len & (block_size - 1))) {
1776                 printk(KERN_ERR "onenand_erase: Length not block aligned\n");
1777                 return -EINVAL;
1778         }
1779
1780         /* Do not allow erase past end of device */
1781         if (unlikely((instr->len + instr->addr) > mtd->size)) {
1782                 printk(KERN_ERR "onenand_erase: Erase past end of device\n");
1783                 return -EINVAL;
1784         }
1785
1786         instr->fail_addr = 0xffffffff;
1787
1788         /* Grab the lock and see if the device is available */
1789         onenand_get_device(mtd, FL_ERASING);
1790
1791         /* Loop throught the pages */
1792         len = instr->len;
1793         addr = instr->addr;
1794
1795         instr->state = MTD_ERASING;
1796
1797         while (len) {
1798                 cond_resched();
1799
1800                 /* Check if we have a bad block, we do not erase bad blocks */
1801                 if (onenand_block_isbad_nolock(mtd, addr, 0)) {
1802                         printk (KERN_WARNING "onenand_erase: attempt to erase a bad block at addr 0x%08x\n", (unsigned int) addr);
1803                         instr->state = MTD_ERASE_FAILED;
1804                         goto erase_exit;
1805                 }
1806
1807                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
1808
1809                 onenand_invalidate_bufferram(mtd, addr, block_size);
1810
1811                 ret = this->wait(mtd, FL_ERASING);
1812                 /* Check, if it is write protected */
1813                 if (ret) {
1814                         printk(KERN_ERR "onenand_erase: Failed erase, block %d\n", (unsigned) (addr >> this->erase_shift));
1815                         instr->state = MTD_ERASE_FAILED;
1816                         instr->fail_addr = addr;
1817                         goto erase_exit;
1818                 }
1819
1820                 len -= block_size;
1821                 addr += block_size;
1822         }
1823
1824         instr->state = MTD_ERASE_DONE;
1825
1826 erase_exit:
1827
1828         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
1829
1830         /* Deselect and wake up anyone waiting on the device */
1831         onenand_release_device(mtd);
1832
1833         /* Do call back function */
1834         if (!ret)
1835                 mtd_erase_callback(instr);
1836
1837         return ret;
1838 }
1839
1840 /**
1841  * onenand_sync - [MTD Interface] sync
1842  * @param mtd           MTD device structure
1843  *
1844  * Sync is actually a wait for chip ready function
1845  */
1846 static void onenand_sync(struct mtd_info *mtd)
1847 {
1848         DEBUG(MTD_DEBUG_LEVEL3, "onenand_sync: called\n");
1849
1850         /* Grab the lock and see if the device is available */
1851         onenand_get_device(mtd, FL_SYNCING);
1852
1853         /* Release it and go back */
1854         onenand_release_device(mtd);
1855 }
1856
1857 /**
1858  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
1859  * @param mtd           MTD device structure
1860  * @param ofs           offset relative to mtd start
1861  *
1862  * Check whether the block is bad
1863  */
1864 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
1865 {
1866         int ret;
1867
1868         /* Check for invalid offset */
1869         if (ofs > mtd->size)
1870                 return -EINVAL;
1871
1872         onenand_get_device(mtd, FL_READING);
1873         ret = onenand_block_isbad_nolock(mtd, ofs, 0);
1874         onenand_release_device(mtd);
1875         return ret;
1876 }
1877
1878 /**
1879  * onenand_default_block_markbad - [DEFAULT] mark a block bad
1880  * @param mtd           MTD device structure
1881  * @param ofs           offset from device start
1882  *
1883  * This is the default implementation, which can be overridden by
1884  * a hardware specific driver.
1885  */
1886 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
1887 {
1888         struct onenand_chip *this = mtd->priv;
1889         struct bbm_info *bbm = this->bbm;
1890         u_char buf[2] = {0, 0};
1891         struct mtd_oob_ops ops = {
1892                 .mode = MTD_OOB_PLACE,
1893                 .ooblen = 2,
1894                 .oobbuf = buf,
1895                 .ooboffs = 0,
1896         };
1897         int block;
1898
1899         /* Get block number */
1900         block = ((int) ofs) >> bbm->bbt_erase_shift;
1901         if (bbm->bbt)
1902                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
1903
1904         /* We write two bytes, so we dont have to mess with 16 bit access */
1905         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
1906         return onenand_write_oob_nolock(mtd, ofs, &ops);
1907 }
1908
1909 /**
1910  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
1911  * @param mtd           MTD device structure
1912  * @param ofs           offset relative to mtd start
1913  *
1914  * Mark the block as bad
1915  */
1916 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
1917 {
1918         struct onenand_chip *this = mtd->priv;
1919         int ret;
1920
1921         ret = onenand_block_isbad(mtd, ofs);
1922         if (ret) {
1923                 /* If it was bad already, return success and do nothing */
1924                 if (ret > 0)
1925                         return 0;
1926                 return ret;
1927         }
1928
1929         onenand_get_device(mtd, FL_WRITING);
1930         ret = this->block_markbad(mtd, ofs);
1931         onenand_release_device(mtd);
1932         return ret;
1933 }
1934
1935 /**
1936  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
1937  * @param mtd           MTD device structure
1938  * @param ofs           offset relative to mtd start
1939  * @param len           number of bytes to lock or unlock
1940  * @param cmd           lock or unlock command
1941  *
1942  * Lock or unlock one or more blocks
1943  */
1944 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
1945 {
1946         struct onenand_chip *this = mtd->priv;
1947         int start, end, block, value, status;
1948         int wp_status_mask;
1949
1950         start = ofs >> this->erase_shift;
1951         end = len >> this->erase_shift;
1952
1953         if (cmd == ONENAND_CMD_LOCK)
1954                 wp_status_mask = ONENAND_WP_LS;
1955         else
1956                 wp_status_mask = ONENAND_WP_US;
1957
1958         /* Continuous lock scheme */
1959         if (this->options & ONENAND_HAS_CONT_LOCK) {
1960                 /* Set start block address */
1961                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1962                 /* Set end block address */
1963                 this->write_word(start + end - 1, this->base + ONENAND_REG_END_BLOCK_ADDRESS);
1964                 /* Write lock command */
1965                 this->command(mtd, cmd, 0, 0);
1966
1967                 /* There's no return value */
1968                 this->wait(mtd, FL_LOCKING);
1969
1970                 /* Sanity check */
1971                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
1972                     & ONENAND_CTRL_ONGO)
1973                         continue;
1974
1975                 /* Check lock status */
1976                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
1977                 if (!(status & wp_status_mask))
1978                         printk(KERN_ERR "wp status = 0x%x\n", status);
1979
1980                 return 0;
1981         }
1982
1983         /* Block lock scheme */
1984         for (block = start; block < start + end; block++) {
1985                 /* Set block address */
1986                 value = onenand_block_address(this, block);
1987                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
1988                 /* Select DataRAM for DDP */
1989                 value = onenand_bufferram_address(this, block);
1990                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
1991                 /* Set start block address */
1992                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
1993                 /* Write lock command */
1994                 this->command(mtd, cmd, 0, 0);
1995
1996                 /* There's no return value */
1997                 this->wait(mtd, FL_LOCKING);
1998
1999                 /* Sanity check */
2000                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2001                     & ONENAND_CTRL_ONGO)
2002                         continue;
2003
2004                 /* Check lock status */
2005                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2006                 if (!(status & wp_status_mask))
2007                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
2008         }
2009
2010         return 0;
2011 }
2012
2013 /**
2014  * onenand_lock - [MTD Interface] Lock block(s)
2015  * @param mtd           MTD device structure
2016  * @param ofs           offset relative to mtd start
2017  * @param len           number of bytes to unlock
2018  *
2019  * Lock one or more blocks
2020  */
2021 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
2022 {
2023         int ret;
2024
2025         onenand_get_device(mtd, FL_LOCKING);
2026         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
2027         onenand_release_device(mtd);
2028         return ret;
2029 }
2030
2031 /**
2032  * onenand_unlock - [MTD Interface] Unlock block(s)
2033  * @param mtd           MTD device structure
2034  * @param ofs           offset relative to mtd start
2035  * @param len           number of bytes to unlock
2036  *
2037  * Unlock one or more blocks
2038  */
2039 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
2040 {
2041         int ret;
2042
2043         onenand_get_device(mtd, FL_LOCKING);
2044         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2045         onenand_release_device(mtd);
2046         return ret;
2047 }
2048
2049 /**
2050  * onenand_check_lock_status - [OneNAND Interface] Check lock status
2051  * @param this          onenand chip data structure
2052  *
2053  * Check lock status
2054  */
2055 static void onenand_check_lock_status(struct onenand_chip *this)
2056 {
2057         unsigned int value, block, status;
2058         unsigned int end;
2059
2060         end = this->chipsize >> this->erase_shift;
2061         for (block = 0; block < end; block++) {
2062                 /* Set block address */
2063                 value = onenand_block_address(this, block);
2064                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2065                 /* Select DataRAM for DDP */
2066                 value = onenand_bufferram_address(this, block);
2067                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2068                 /* Set start block address */
2069                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2070
2071                 /* Check lock status */
2072                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2073                 if (!(status & ONENAND_WP_US))
2074                         printk(KERN_ERR "block = %d, wp status = 0x%x\n", block, status);
2075         }
2076 }
2077
2078 /**
2079  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
2080  * @param mtd           MTD device structure
2081  *
2082  * Unlock all blocks
2083  */
2084 static int onenand_unlock_all(struct mtd_info *mtd)
2085 {
2086         struct onenand_chip *this = mtd->priv;
2087
2088         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
2089                 /* Set start block address */
2090                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2091                 /* Write unlock command */
2092                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
2093
2094                 /* There's no return value */
2095                 this->wait(mtd, FL_LOCKING);
2096
2097                 /* Sanity check */
2098                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2099                     & ONENAND_CTRL_ONGO)
2100                         continue;
2101
2102                 /* Workaround for all block unlock in DDP */
2103                 if (ONENAND_IS_DDP(this)) {
2104                         /* 1st block on another chip */
2105                         loff_t ofs = this->chipsize >> 1;
2106                         size_t len = mtd->erasesize;
2107
2108                         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2109                 }
2110
2111                 onenand_check_lock_status(this);
2112
2113                 return 0;
2114         }
2115
2116         onenand_do_lock_cmd(mtd, 0x0, this->chipsize, ONENAND_CMD_UNLOCK);
2117
2118         return 0;
2119 }
2120
2121 #ifdef CONFIG_MTD_ONENAND_OTP
2122
2123 /* Interal OTP operation */
2124 typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
2125                 size_t *retlen, u_char *buf);
2126
2127 /**
2128  * do_otp_read - [DEFAULT] Read OTP block area
2129  * @param mtd           MTD device structure
2130  * @param from          The offset to read
2131  * @param len           number of bytes to read
2132  * @param retlen        pointer to variable to store the number of readbytes
2133  * @param buf           the databuffer to put/get data
2134  *
2135  * Read OTP block area.
2136  */
2137 static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
2138                 size_t *retlen, u_char *buf)
2139 {
2140         struct onenand_chip *this = mtd->priv;
2141         struct mtd_oob_ops ops = {
2142                 .len    = len,
2143                 .ooblen = 0,
2144                 .datbuf = buf,
2145                 .oobbuf = NULL,
2146         };
2147         int ret;
2148
2149         /* Enter OTP access mode */
2150         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2151         this->wait(mtd, FL_OTPING);
2152
2153         ret = onenand_read_ops_nolock(mtd, from, &ops);
2154
2155         /* Exit OTP access mode */
2156         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2157         this->wait(mtd, FL_RESETING);
2158
2159         return ret;
2160 }
2161
2162 /**
2163  * do_otp_write - [DEFAULT] Write OTP block area
2164  * @param mtd           MTD device structure
2165  * @param to            The offset to write
2166  * @param len           number of bytes to write
2167  * @param retlen        pointer to variable to store the number of write bytes
2168  * @param buf           the databuffer to put/get data
2169  *
2170  * Write OTP block area.
2171  */
2172 static int do_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
2173                 size_t *retlen, u_char *buf)
2174 {
2175         struct onenand_chip *this = mtd->priv;
2176         unsigned char *pbuf = buf;
2177         int ret;
2178         struct mtd_oob_ops ops;
2179
2180         /* Force buffer page aligned */
2181         if (len < mtd->writesize) {
2182                 memcpy(this->page_buf, buf, len);
2183                 memset(this->page_buf + len, 0xff, mtd->writesize - len);
2184                 pbuf = this->page_buf;
2185                 len = mtd->writesize;
2186         }
2187
2188         /* Enter OTP access mode */
2189         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2190         this->wait(mtd, FL_OTPING);
2191
2192         ops.len = len;
2193         ops.ooblen = 0;
2194         ops.datbuf = pbuf;
2195         ops.oobbuf = NULL;
2196         ret = onenand_write_ops_nolock(mtd, to, &ops);
2197         *retlen = ops.retlen;
2198
2199         /* Exit OTP access mode */
2200         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2201         this->wait(mtd, FL_RESETING);
2202
2203         return ret;
2204 }
2205
2206 /**
2207  * do_otp_lock - [DEFAULT] Lock OTP block area
2208  * @param mtd           MTD device structure
2209  * @param from          The offset to lock
2210  * @param len           number of bytes to lock
2211  * @param retlen        pointer to variable to store the number of lock bytes
2212  * @param buf           the databuffer to put/get data
2213  *
2214  * Lock OTP block area.
2215  */
2216 static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
2217                 size_t *retlen, u_char *buf)
2218 {
2219         struct onenand_chip *this = mtd->priv;
2220         struct mtd_oob_ops ops = {
2221                 .mode = MTD_OOB_PLACE,
2222                 .ooblen = len,
2223                 .oobbuf = buf,
2224                 .ooboffs = 0,
2225         };
2226         int ret;
2227
2228         /* Enter OTP access mode */
2229         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2230         this->wait(mtd, FL_OTPING);
2231
2232         ret = onenand_write_oob_nolock(mtd, from, &ops);
2233
2234         *retlen = ops.oobretlen;
2235
2236         /* Exit OTP access mode */
2237         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2238         this->wait(mtd, FL_RESETING);
2239
2240         return ret;
2241 }
2242
2243 /**
2244  * onenand_otp_walk - [DEFAULT] Handle OTP operation
2245  * @param mtd           MTD device structure
2246  * @param from          The offset to read/write
2247  * @param len           number of bytes to read/write
2248  * @param retlen        pointer to variable to store the number of read bytes
2249  * @param buf           the databuffer to put/get data
2250  * @param action        do given action
2251  * @param mode          specify user and factory
2252  *
2253  * Handle OTP operation.
2254  */
2255 static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
2256                         size_t *retlen, u_char *buf,
2257                         otp_op_t action, int mode)
2258 {
2259         struct onenand_chip *this = mtd->priv;
2260         int otp_pages;
2261         int density;
2262         int ret = 0;
2263
2264         *retlen = 0;
2265
2266         density = onenand_get_density(this->device_id);
2267         if (density < ONENAND_DEVICE_DENSITY_512Mb)
2268                 otp_pages = 20;
2269         else
2270                 otp_pages = 10;
2271
2272         if (mode == MTD_OTP_FACTORY) {
2273                 from += mtd->writesize * otp_pages;
2274                 otp_pages = 64 - otp_pages;
2275         }
2276
2277         /* Check User/Factory boundary */
2278         if (((mtd->writesize * otp_pages) - (from + len)) < 0)
2279                 return 0;
2280
2281         onenand_get_device(mtd, FL_OTPING);
2282         while (len > 0 && otp_pages > 0) {
2283                 if (!action) {  /* OTP Info functions */
2284                         struct otp_info *otpinfo;
2285
2286                         len -= sizeof(struct otp_info);
2287                         if (len <= 0) {
2288                                 ret = -ENOSPC;
2289                                 break;
2290                         }
2291
2292                         otpinfo = (struct otp_info *) buf;
2293                         otpinfo->start = from;
2294                         otpinfo->length = mtd->writesize;
2295                         otpinfo->locked = 0;
2296
2297                         from += mtd->writesize;
2298                         buf += sizeof(struct otp_info);
2299                         *retlen += sizeof(struct otp_info);
2300                 } else {
2301                         size_t tmp_retlen;
2302                         int size = len;
2303
2304                         ret = action(mtd, from, len, &tmp_retlen, buf);
2305
2306                         buf += size;
2307                         len -= size;
2308                         *retlen += size;
2309
2310                         if (ret)
2311                                 break;
2312                 }
2313                 otp_pages--;
2314         }
2315         onenand_release_device(mtd);
2316
2317         return ret;
2318 }
2319
2320 /**
2321  * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
2322  * @param mtd           MTD device structure
2323  * @param buf           the databuffer to put/get data
2324  * @param len           number of bytes to read
2325  *
2326  * Read factory OTP info.
2327  */
2328 static int onenand_get_fact_prot_info(struct mtd_info *mtd,
2329                         struct otp_info *buf, size_t len)
2330 {
2331         size_t retlen;
2332         int ret;
2333
2334         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);
2335
2336         return ret ? : retlen;
2337 }
2338
2339 /**
2340  * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
2341  * @param mtd           MTD device structure
2342  * @param from          The offset to read
2343  * @param len           number of bytes to read
2344  * @param retlen        pointer to variable to store the number of read bytes
2345  * @param buf           the databuffer to put/get data
2346  *
2347  * Read factory OTP area.
2348  */
2349 static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
2350                         size_t len, size_t *retlen, u_char *buf)
2351 {
2352         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
2353 }
2354
2355 /**
2356  * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
2357  * @param mtd           MTD device structure
2358  * @param buf           the databuffer to put/get data
2359  * @param len           number of bytes to read
2360  *
2361  * Read user OTP info.
2362  */
2363 static int onenand_get_user_prot_info(struct mtd_info *mtd,
2364                         struct otp_info *buf, size_t len)
2365 {
2366         size_t retlen;
2367         int ret;
2368
2369         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);
2370
2371         return ret ? : retlen;
2372 }
2373
2374 /**
2375  * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
2376  * @param mtd           MTD device structure
2377  * @param from          The offset to read
2378  * @param len           number of bytes to read
2379  * @param retlen        pointer to variable to store the number of read bytes
2380  * @param buf           the databuffer to put/get data
2381  *
2382  * Read user OTP area.
2383  */
2384 static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
2385                         size_t len, size_t *retlen, u_char *buf)
2386 {
2387         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
2388 }
2389
2390 /**
2391  * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
2392  * @param mtd           MTD device structure
2393  * @param from          The offset to write
2394  * @param len           number of bytes to write
2395  * @param retlen        pointer to variable to store the number of write bytes
2396  * @param buf           the databuffer to put/get data
2397  *
2398  * Write user OTP area.
2399  */
2400 static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
2401                         size_t len, size_t *retlen, u_char *buf)
2402 {
2403         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
2404 }
2405
2406 /**
2407  * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
2408  * @param mtd           MTD device structure
2409  * @param from          The offset to lock
2410  * @param len           number of bytes to unlock
2411  *
2412  * Write lock mark on spare area in page 0 in OTP block
2413  */
2414 static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
2415                         size_t len)
2416 {
2417         struct onenand_chip *this = mtd->priv;
2418         u_char *oob_buf = this->oob_buf;
2419         size_t retlen;
2420         int ret;
2421
2422         memset(oob_buf, 0xff, mtd->oobsize);
2423         /*
2424          * Note: OTP lock operation
2425          *       OTP block : 0xXXFC
2426          *       1st block : 0xXXF3 (If chip support)
2427          *       Both      : 0xXXF0 (If chip support)
2428          */
2429         oob_buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
2430
2431         /*
2432          * Write lock mark to 8th word of sector0 of page0 of the spare0.
2433          * We write 16 bytes spare area instead of 2 bytes.
2434          */
2435         from = 0;
2436         len = 16;
2437
2438         ret = onenand_otp_walk(mtd, from, len, &retlen, oob_buf, do_otp_lock, MTD_OTP_USER);
2439
2440         return ret ? : retlen;
2441 }
2442 #endif  /* CONFIG_MTD_ONENAND_OTP */
2443
2444 /**
2445  * onenand_check_features - Check and set OneNAND features
2446  * @param mtd           MTD data structure
2447  *
2448  * Check and set OneNAND features
2449  * - lock scheme
2450  * - two plane
2451  */
2452 static void onenand_check_features(struct mtd_info *mtd)
2453 {
2454         struct onenand_chip *this = mtd->priv;
2455         unsigned int density, process;
2456
2457         /* Lock scheme depends on density and process */
2458         density = onenand_get_density(this->device_id);
2459         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
2460
2461         /* Lock scheme */
2462         switch (density) {
2463         case ONENAND_DEVICE_DENSITY_4Gb:
2464                 this->options |= ONENAND_HAS_2PLANE;
2465
2466         case ONENAND_DEVICE_DENSITY_2Gb:
2467                 /* 2Gb DDP don't have 2 plane */
2468                 if (!ONENAND_IS_DDP(this))
2469                         this->options |= ONENAND_HAS_2PLANE;
2470                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2471
2472         case ONENAND_DEVICE_DENSITY_1Gb:
2473                 /* A-Die has all block unlock */
2474                 if (process)
2475                         this->options |= ONENAND_HAS_UNLOCK_ALL;
2476                 break;
2477
2478         default:
2479                 /* Some OneNAND has continuous lock scheme */
2480                 if (!process)
2481                         this->options |= ONENAND_HAS_CONT_LOCK;
2482                 break;
2483         }
2484
2485         if (this->options & ONENAND_HAS_CONT_LOCK)
2486                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
2487         if (this->options & ONENAND_HAS_UNLOCK_ALL)
2488                 printk(KERN_DEBUG "Chip support all block unlock\n");
2489         if (this->options & ONENAND_HAS_2PLANE)
2490                 printk(KERN_DEBUG "Chip has 2 plane\n");
2491 }
2492
2493 /**
2494  * onenand_print_device_info - Print device & version ID
2495  * @param device        device ID
2496  * @param version       version ID
2497  *
2498  * Print device & version ID
2499  */
2500 static void onenand_print_device_info(int device, int version)
2501 {
2502         int vcc, demuxed, ddp, density;
2503
2504         vcc = device & ONENAND_DEVICE_VCC_MASK;
2505         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
2506         ddp = device & ONENAND_DEVICE_IS_DDP;
2507         density = onenand_get_density(device);
2508         printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
2509                 demuxed ? "" : "Muxed ",
2510                 ddp ? "(DDP)" : "",
2511                 (16 << density),
2512                 vcc ? "2.65/3.3" : "1.8",
2513                 device);
2514         printk(KERN_INFO "OneNAND version = 0x%04x\n", version);
2515 }
2516
2517 static const struct onenand_manufacturers onenand_manuf_ids[] = {
2518         {ONENAND_MFR_SAMSUNG, "Samsung"},
2519 };
2520
2521 /**
2522  * onenand_check_maf - Check manufacturer ID
2523  * @param manuf         manufacturer ID
2524  *
2525  * Check manufacturer ID
2526  */
2527 static int onenand_check_maf(int manuf)
2528 {
2529         int size = ARRAY_SIZE(onenand_manuf_ids);
2530         char *name;
2531         int i;
2532
2533         for (i = 0; i < size; i++)
2534                 if (manuf == onenand_manuf_ids[i].id)
2535                         break;
2536
2537         if (i < size)
2538                 name = onenand_manuf_ids[i].name;
2539         else
2540                 name = "Unknown";
2541
2542         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
2543
2544         return (i == size);
2545 }
2546
2547 /**
2548  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
2549  * @param mtd           MTD device structure
2550  *
2551  * OneNAND detection method:
2552  *   Compare the values from command with ones from register
2553  */
2554 static int onenand_probe(struct mtd_info *mtd)
2555 {
2556         struct onenand_chip *this = mtd->priv;
2557         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
2558         int density;
2559         int syscfg;
2560
2561         /* Save system configuration 1 */
2562         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
2563         /* Clear Sync. Burst Read mode to read BootRAM */
2564         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ), this->base + ONENAND_REG_SYS_CFG1);
2565
2566         /* Send the command for reading device ID from BootRAM */
2567         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
2568
2569         /* Read manufacturer and device IDs from BootRAM */
2570         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
2571         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
2572
2573         /* Reset OneNAND to read default register values */
2574         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
2575         /* Wait reset */
2576         this->wait(mtd, FL_RESETING);
2577
2578         /* Restore system configuration 1 */
2579         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
2580
2581         /* Check manufacturer ID */
2582         if (onenand_check_maf(bram_maf_id))
2583                 return -ENXIO;
2584
2585         /* Read manufacturer and device IDs from Register */
2586         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
2587         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
2588         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
2589
2590         /* Check OneNAND device */
2591         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
2592                 return -ENXIO;
2593
2594         /* Flash device information */
2595         onenand_print_device_info(dev_id, ver_id);
2596         this->device_id = dev_id;
2597         this->version_id = ver_id;
2598
2599         density = onenand_get_density(dev_id);
2600         this->chipsize = (16 << density) << 20;
2601         /* Set density mask. it is used for DDP */
2602         if (ONENAND_IS_DDP(this))
2603                 this->density_mask = (1 << (density + 6));
2604         else
2605                 this->density_mask = 0;
2606
2607         /* OneNAND page size & block size */
2608         /* The data buffer size is equal to page size */
2609         mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
2610         mtd->oobsize = mtd->writesize >> 5;
2611         /* Pages per a block are always 64 in OneNAND */
2612         mtd->erasesize = mtd->writesize << 6;
2613
2614         this->erase_shift = ffs(mtd->erasesize) - 1;
2615         this->page_shift = ffs(mtd->writesize) - 1;
2616         this->page_mask = (1 << (this->erase_shift - this->page_shift)) - 1;
2617         /* It's real page size */
2618         this->writesize = mtd->writesize;
2619
2620         /* REVIST: Multichip handling */
2621
2622         mtd->size = this->chipsize;
2623
2624         /* Check OneNAND features */
2625         onenand_check_features(mtd);
2626
2627         /*
2628          * We emulate the 4KiB page and 256KiB erase block size
2629          * But oobsize is still 64 bytes.
2630          * It is only valid if you turn on 2X program support,
2631          * Otherwise it will be ignored by compiler.
2632          */
2633         if (ONENAND_IS_2PLANE(this)) {
2634                 mtd->writesize <<= 1;
2635                 mtd->erasesize <<= 1;
2636         }
2637
2638         return 0;
2639 }
2640
2641 /**
2642  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
2643  * @param mtd           MTD device structure
2644  */
2645 static int onenand_suspend(struct mtd_info *mtd)
2646 {
2647         return onenand_get_device(mtd, FL_PM_SUSPENDED);
2648 }
2649
2650 /**
2651  * onenand_resume - [MTD Interface] Resume the OneNAND flash
2652  * @param mtd           MTD device structure
2653  */
2654 static void onenand_resume(struct mtd_info *mtd)
2655 {
2656         struct onenand_chip *this = mtd->priv;
2657
2658         if (this->state == FL_PM_SUSPENDED)
2659                 onenand_release_device(mtd);
2660         else
2661                 printk(KERN_ERR "resume() called for the chip which is not"
2662                                 "in suspended state\n");
2663 }
2664
2665 /**
2666  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
2667  * @param mtd           MTD device structure
2668  * @param maxchips      Number of chips to scan for
2669  *
2670  * This fills out all the not initialized function pointers
2671  * with the defaults.
2672  * The flash ID is read and the mtd/chip structures are
2673  * filled with the appropriate values.
2674  */
2675 int onenand_scan(struct mtd_info *mtd, int maxchips)
2676 {
2677         int i;
2678         struct onenand_chip *this = mtd->priv;
2679
2680         if (!this->read_word)
2681                 this->read_word = onenand_readw;
2682         if (!this->write_word)
2683                 this->write_word = onenand_writew;
2684
2685         if (!this->command)
2686                 this->command = onenand_command;
2687         if (!this->wait)
2688                 onenand_setup_wait(mtd);
2689
2690         if (!this->read_bufferram)
2691                 this->read_bufferram = onenand_read_bufferram;
2692         if (!this->write_bufferram)
2693                 this->write_bufferram = onenand_write_bufferram;
2694
2695         if (!this->block_markbad)
2696                 this->block_markbad = onenand_default_block_markbad;
2697         if (!this->scan_bbt)
2698                 this->scan_bbt = onenand_default_bbt;
2699
2700         if (onenand_probe(mtd))
2701                 return -ENXIO;
2702
2703         /* Set Sync. Burst Read after probing */
2704         if (this->mmcontrol) {
2705                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
2706                 this->read_bufferram = onenand_sync_read_bufferram;
2707         }
2708
2709         /* Allocate buffers, if necessary */
2710         if (!this->page_buf) {
2711                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
2712                 if (!this->page_buf) {
2713                         printk(KERN_ERR "onenand_scan(): Can't allocate page_buf\n");
2714                         return -ENOMEM;
2715                 }
2716                 this->options |= ONENAND_PAGEBUF_ALLOC;
2717         }
2718         if (!this->oob_buf) {
2719                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
2720                 if (!this->oob_buf) {
2721                         printk(KERN_ERR "onenand_scan(): Can't allocate oob_buf\n");
2722                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
2723                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
2724                                 kfree(this->page_buf);
2725                         }
2726                         return -ENOMEM;
2727                 }
2728                 this->options |= ONENAND_OOBBUF_ALLOC;
2729         }
2730
2731         this->state = FL_READY;
2732         init_waitqueue_head(&this->wq);
2733         spin_lock_init(&this->chip_lock);
2734
2735         /*
2736          * Allow subpage writes up to oobsize.
2737          */
2738         switch (mtd->oobsize) {
2739         case 64:
2740                 this->ecclayout = &onenand_oob_64;
2741                 mtd->subpage_sft = 2;
2742                 break;
2743
2744         case 32:
2745                 this->ecclayout = &onenand_oob_32;
2746                 mtd->subpage_sft = 1;
2747                 break;
2748
2749         default:
2750                 printk(KERN_WARNING "No OOB scheme defined for oobsize %d\n",
2751                         mtd->oobsize);
2752                 mtd->subpage_sft = 0;
2753                 /* To prevent kernel oops */
2754                 this->ecclayout = &onenand_oob_32;
2755                 break;
2756         }
2757
2758         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
2759
2760         /*
2761          * The number of bytes available for a client to place data into
2762          * the out of band area
2763          */
2764         this->ecclayout->oobavail = 0;
2765         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
2766             this->ecclayout->oobfree[i].length; i++)
2767                 this->ecclayout->oobavail +=
2768                         this->ecclayout->oobfree[i].length;
2769         mtd->oobavail = this->ecclayout->oobavail;
2770
2771         mtd->ecclayout = this->ecclayout;
2772
2773         /* Fill in remaining MTD driver data */
2774         mtd->type = MTD_NANDFLASH;
2775         mtd->flags = MTD_CAP_NANDFLASH;
2776         mtd->erase = onenand_erase;
2777         mtd->point = NULL;
2778         mtd->unpoint = NULL;
2779         mtd->read = onenand_read;
2780         mtd->write = onenand_write;
2781         mtd->read_oob = onenand_read_oob;
2782         mtd->write_oob = onenand_write_oob;
2783         mtd->panic_write = onenand_panic_write;
2784 #ifdef CONFIG_MTD_ONENAND_OTP
2785         mtd->get_fact_prot_info = onenand_get_fact_prot_info;
2786         mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;
2787         mtd->get_user_prot_info = onenand_get_user_prot_info;
2788         mtd->read_user_prot_reg = onenand_read_user_prot_reg;
2789         mtd->write_user_prot_reg = onenand_write_user_prot_reg;
2790         mtd->lock_user_prot_reg = onenand_lock_user_prot_reg;
2791 #endif
2792         mtd->sync = onenand_sync;
2793         mtd->lock = onenand_lock;
2794         mtd->unlock = onenand_unlock;
2795         mtd->suspend = onenand_suspend;
2796         mtd->resume = onenand_resume;
2797         mtd->block_isbad = onenand_block_isbad;
2798         mtd->block_markbad = onenand_block_markbad;
2799         mtd->owner = THIS_MODULE;
2800
2801         /* Unlock whole block */
2802         onenand_unlock_all(mtd);
2803
2804         return this->scan_bbt(mtd);
2805 }
2806
2807 /**
2808  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
2809  * @param mtd           MTD device structure
2810  */
2811 void onenand_release(struct mtd_info *mtd)
2812 {
2813         struct onenand_chip *this = mtd->priv;
2814
2815 #ifdef CONFIG_MTD_PARTITIONS
2816         /* Deregister partitions */
2817         del_mtd_partitions (mtd);
2818 #endif
2819         /* Deregister the device */
2820         del_mtd_device (mtd);
2821
2822         /* Free bad block table memory, if allocated */
2823         if (this->bbm) {
2824                 struct bbm_info *bbm = this->bbm;
2825                 kfree(bbm->bbt);
2826                 kfree(this->bbm);
2827         }
2828         /* Buffers allocated by onenand_scan */
2829         if (this->options & ONENAND_PAGEBUF_ALLOC)
2830                 kfree(this->page_buf);
2831         if (this->options & ONENAND_OOBBUF_ALLOC)
2832                 kfree(this->oob_buf);
2833 }
2834
2835 EXPORT_SYMBOL_GPL(onenand_scan);
2836 EXPORT_SYMBOL_GPL(onenand_release);
2837
2838 MODULE_LICENSE("GPL");
2839 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
2840 MODULE_DESCRIPTION("Generic OneNAND flash driver code");