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  *      Vishak G <vishak.g at samsung.com>, Rohit Hagargundgi <h.rohit at samsung.com>
  13  *      Flex-OneNAND support
  14  *      Copyright (C) Samsung Electronics, 2008
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/moduleparam.h>
  24 #include <linux/init.h>
  25 #include <linux/sched.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/onenand.h>
  31 #include <linux/mtd/partitions.h>
  32
  33 #include <asm/io.h>
  34
  35 /* Default Flex-OneNAND boundary and lock respectively */
  36 static int flex_bdry[MAX_DIES * 2] = { -1, 0, -1, 0 };
  37
  38 module_param_array(flex_bdry, int, NULL, 0400);
  39 MODULE_PARM_DESC(flex_bdry,     "SLC Boundary information for Flex-OneNAND"
  40                                 "Syntax:flex_bdry=DIE_BDRY,LOCK,..."
  41                                 "DIE_BDRY: SLC boundary of the die"
  42                                 "LOCK: Locking information for SLC boundary"
  43                                 "    : 0->Set boundary in unlocked status"
  44                                 "    : 1->Set boundary in locked status");
  45
  46 /**
  47  *  onenand_oob_128 - oob info for Flex-Onenand with 4KB page
  48  *  For now, we expose only 64 out of 80 ecc bytes
  49  */
  50 static struct nand_ecclayout onenand_oob_128 = {
  51         .eccbytes       = 64,
  52         .eccpos         = {
  53                 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  54                 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  55                 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  56                 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
  57                 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
  58                 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
  59                 102, 103, 104, 105
  60                 },
  61         .oobfree        = {
  62                 {2, 4}, {18, 4}, {34, 4}, {50, 4},
  63                 {66, 4}, {82, 4}, {98, 4}, {114, 4}
  64         }
  65 };
  66
  67 /**
  68  * onenand_oob_64 - oob info for large (2KB) page
  69  */
  70 static struct nand_ecclayout onenand_oob_64 = {
  71         .eccbytes       = 20,
  72         .eccpos         = {
  73                 8, 9, 10, 11, 12,
  74                 24, 25, 26, 27, 28,
  75                 40, 41, 42, 43, 44,
  76                 56, 57, 58, 59, 60,
  77                 },
  78         .oobfree        = {
  79                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
  80                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
  81         }
  82 };
  83
  84 /**
  85  * onenand_oob_32 - oob info for middle (1KB) page
  86  */
  87 static struct nand_ecclayout onenand_oob_32 = {
  88         .eccbytes       = 10,
  89         .eccpos         = {
  90                 8, 9, 10, 11, 12,
  91                 24, 25, 26, 27, 28,
  92                 },
  93         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
  94 };
  95
  96 static const unsigned char ffchars[] = {
  97         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
  98         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
  99         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 100         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
 101         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 102         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
 103         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 104         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
 105         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 106         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 80 */
 107         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 108         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 96 */
 109         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 110         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 112 */
 111         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 112         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128 */
 113 };
 114
 115 /**
 116  * onenand_readw - [OneNAND Interface] Read OneNAND register
 117  * @param addr          address to read
 118  *
 119  * Read OneNAND register
 120  */
 121 static unsigned short onenand_readw(void __iomem *addr)
 122 {
 123         return readw(addr);
 124 }
 125
 126 /**
 127  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
 128  * @param value         value to write
 129  * @param addr          address to write
 130  *
 131  * Write OneNAND register with value
 132  */
 133 static void onenand_writew(unsigned short value, void __iomem *addr)
 134 {
 135         writew(value, addr);
 136 }
 137
 138 /**
 139  * onenand_block_address - [DEFAULT] Get block address
 140  * @param this          onenand chip data structure
 141  * @param block         the block
 142  * @return              translated block address if DDP, otherwise same
 143  *
 144  * Setup Start Address 1 Register (F100h)
 145  */
 146 static int onenand_block_address(struct onenand_chip *this, int block)
 147 {
 148         /* Device Flash Core select, NAND Flash Block Address */
 149         if (block & this->density_mask)
 150                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 151
 152         return block;
 153 }
 154
 155 /**
 156  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 157  * @param this          onenand chip data structure
 158  * @param block         the block
 159  * @return              set DBS value if DDP, otherwise 0
 160  *
 161  * Setup Start Address 2 Register (F101h) for DDP
 162  */
 163 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 164 {
 165         /* Device BufferRAM Select */
 166         if (block & this->density_mask)
 167                 return ONENAND_DDP_CHIP1;
 168
 169         return ONENAND_DDP_CHIP0;
 170 }
 171
 172 /**
 173  * onenand_page_address - [DEFAULT] Get page address
 174  * @param page          the page address
 175  * @param sector        the sector address
 176  * @return              combined page and sector address
 177  *
 178  * Setup Start Address 8 Register (F107h)
 179  */
 180 static int onenand_page_address(int page, int sector)
 181 {
 182         /* Flash Page Address, Flash Sector Address */
 183         int fpa, fsa;
 184
 185         fpa = page & ONENAND_FPA_MASK;
 186         fsa = sector & ONENAND_FSA_MASK;
 187
 188         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 189 }
 190
 191 /**
 192  * onenand_buffer_address - [DEFAULT] Get buffer address
 193  * @param dataram1      DataRAM index
 194  * @param sectors       the sector address
 195  * @param count         the number of sectors
 196  * @return              the start buffer value
 197  *
 198  * Setup Start Buffer Register (F200h)
 199  */
 200 static int onenand_buffer_address(int dataram1, int sectors, int count)
 201 {
 202         int bsa, bsc;
 203
 204         /* BufferRAM Sector Address */
 205         bsa = sectors & ONENAND_BSA_MASK;
 206
 207         if (dataram1)
 208                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 209         else
 210                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 211
 212         /* BufferRAM Sector Count */
 213         bsc = count & ONENAND_BSC_MASK;
 214
 215         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 216 }
 217
 218 /**
 219  * flexonenand_block- For given address return block number
 220  * @param this         - OneNAND device structure
 221  * @param addr          - Address for which block number is needed
 222  */
 223 static unsigned flexonenand_block(struct onenand_chip *this, loff_t addr)
 224 {
 225         unsigned boundary, blk, die = 0;
 226
 227         if (ONENAND_IS_DDP(this) && addr >= this->diesize[0]) {
 228                 die = 1;
 229                 addr -= this->diesize[0];
 230         }
 231
 232         boundary = this->boundary[die];
 233
 234         blk = addr >> (this->erase_shift - 1);
 235         if (blk > boundary)
 236                 blk = (blk + boundary + 1) >> 1;
 237
 238         blk += die ? this->density_mask : 0;
 239         return blk;
 240 }
 241
 242 inline unsigned onenand_block(struct onenand_chip *this, loff_t addr)
 243 {
 244         if (!FLEXONENAND(this))
 245                 return addr >> this->erase_shift;
 246         return flexonenand_block(this, addr);
 247 }
 248
 249 /**
 250  * flexonenand_addr - Return address of the block
 251  * @this:               OneNAND device structure
 252  * @block:              Block number on Flex-OneNAND
 253  *
 254  * Return address of the block
 255  */
 256 static loff_t flexonenand_addr(struct onenand_chip *this, int block)
 257 {
 258         loff_t ofs = 0;
 259         int die = 0, boundary;
 260
 261         if (ONENAND_IS_DDP(this) && block >= this->density_mask) {
 262                 block -= this->density_mask;
 263                 die = 1;
 264                 ofs = this->diesize[0];
 265         }
 266
 267         boundary = this->boundary[die];
 268         ofs += (loff_t)block << (this->erase_shift - 1);
 269         if (block > (boundary + 1))
 270                 ofs += (loff_t)(block - boundary - 1) << (this->erase_shift - 1);
 271         return ofs;
 272 }
 273
 274 loff_t onenand_addr(struct onenand_chip *this, int block)
 275 {
 276         if (!FLEXONENAND(this))
 277                 return (loff_t)block << this->erase_shift;
 278         return flexonenand_addr(this, block);
 279 }
 280 EXPORT_SYMBOL(onenand_addr);
 281
 282 /**
 283  * onenand_get_density - [DEFAULT] Get OneNAND density
 284  * @param dev_id        OneNAND device ID
 285  *
 286  * Get OneNAND density from device ID
 287  */
 288 static inline int onenand_get_density(int dev_id)
 289 {
 290         int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 291         return (density & ONENAND_DEVICE_DENSITY_MASK);
 292 }
 293
 294 /**
 295  * flexonenand_region - [Flex-OneNAND] Return erase region of addr
 296  * @param mtd           MTD device structure
 297  * @param addr          address whose erase region needs to be identified
 298  */
 299 int flexonenand_region(struct mtd_info *mtd, loff_t addr)
 300 {
 301         int i;
 302
 303         for (i = 0; i < mtd->numeraseregions; i++)
 304                 if (addr < mtd->eraseregions[i].offset)
 305                         break;
 306         return i - 1;
 307 }
 308 EXPORT_SYMBOL(flexonenand_region);
 309
 310 /**
 311  * onenand_command - [DEFAULT] Send command to OneNAND device
 312  * @param mtd           MTD device structure
 313  * @param cmd           the command to be sent
 314  * @param addr          offset to read from or write to
 315  * @param len           number of bytes to read or write
 316  *
 317  * Send command to OneNAND device. This function is used for middle/large page
 318  * devices (1KB/2KB Bytes per page)
 319  */
 320 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 321 {
 322         struct onenand_chip *this = mtd->priv;
 323         int value, block, page;
 324
 325         /* Address translation */
 326         switch (cmd) {
 327         case ONENAND_CMD_UNLOCK:
 328         case ONENAND_CMD_LOCK:
 329         case ONENAND_CMD_LOCK_TIGHT:
 330         case ONENAND_CMD_UNLOCK_ALL:
 331                 block = -1;
 332                 page = -1;
 333                 break;
 334
 335         case FLEXONENAND_CMD_PI_ACCESS:
 336                 /* addr contains die index */
 337                 block = addr * this->density_mask;
 338                 page = -1;
 339                 break;
 340
 341         case ONENAND_CMD_ERASE:
 342         case ONENAND_CMD_BUFFERRAM:
 343         case ONENAND_CMD_OTP_ACCESS:
 344                 block = onenand_block(this, addr);
 345                 page = -1;
 346                 break;
 347
 348         case FLEXONENAND_CMD_READ_PI:
 349                 cmd = ONENAND_CMD_READ;
 350                 block = addr * this->density_mask;
 351                 page = 0;
 352                 break;
 353
 354         default:
 355                 block = onenand_block(this, addr);
 356                 page = (int) (addr - onenand_addr(this, block)) >> this->page_shift;
 357
 358                 if (ONENAND_IS_2PLANE(this)) {
 359                         /* Make the even block number */
 360                         block &= ~1;
 361                         /* Is it the odd plane? */
 362                         if (addr & this->writesize)
 363                                 block++;
 364                         page >>= 1;
 365                 }
 366                 page &= this->page_mask;
 367                 break;
 368         }
 369
 370         /* NOTE: The setting order of the registers is very important! */
 371         if (cmd == ONENAND_CMD_BUFFERRAM) {
 372                 /* Select DataRAM for DDP */
 373                 value = onenand_bufferram_address(this, block);
 374                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 375
 376                 if (ONENAND_IS_MLC(this) || ONENAND_IS_2PLANE(this))
 377                         /* It is always BufferRAM0 */
 378                         ONENAND_SET_BUFFERRAM0(this);
 379                 else
 380                         /* Switch to the next data buffer */
 381                         ONENAND_SET_NEXT_BUFFERRAM(this);
 382
 383                 return 0;
 384         }
 385
 386         if (block != -1) {
 387                 /* Write 'DFS, FBA' of Flash */
 388                 value = onenand_block_address(this, block);
 389                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 390
 391                 /* Select DataRAM for DDP */
 392                 value = onenand_bufferram_address(this, block);
 393                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 394         }
 395
 396         if (page != -1) {
 397                 /* Now we use page size operation */
 398                 int sectors = 0, count = 0;
 399                 int dataram;
 400
 401                 switch (cmd) {
 402                 case FLEXONENAND_CMD_RECOVER_LSB:
 403                 case ONENAND_CMD_READ:
 404                 case ONENAND_CMD_READOOB:
 405                         if (ONENAND_IS_MLC(this))
 406                                 /* It is always BufferRAM0 */
 407                                 dataram = ONENAND_SET_BUFFERRAM0(this);
 408                         else
 409                                 dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 410                         break;
 411
 412                 default:
 413                         if (ONENAND_IS_2PLANE(this) && cmd == ONENAND_CMD_PROG)
 414                                 cmd = ONENAND_CMD_2X_PROG;
 415                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 416                         break;
 417                 }
 418
 419                 /* Write 'FPA, FSA' of Flash */
 420                 value = onenand_page_address(page, sectors);
 421                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 422
 423                 /* Write 'BSA, BSC' of DataRAM */
 424                 value = onenand_buffer_address(dataram, sectors, count);
 425                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 426         }
 427
 428         /* Interrupt clear */
 429         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 430
 431         /* Write command */
 432         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 433
 434         return 0;
 435 }
 436
 437 /**
 438  * onenand_read_ecc - return ecc status
 439  * @param this          onenand chip structure
 440  */
 441 static inline int onenand_read_ecc(struct onenand_chip *this)
 442 {
 443         int ecc, i, result = 0;
 444
 445         if (!FLEXONENAND(this))
 446                 return this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 447
 448         for (i = 0; i < 4; i++) {
 449                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS + i);
 450                 if (likely(!ecc))
 451                         continue;
 452                 if (ecc & FLEXONENAND_UNCORRECTABLE_ERROR)
 453                         return ONENAND_ECC_2BIT_ALL;
 454                 else
 455                         result = ONENAND_ECC_1BIT_ALL;
 456         }
 457
 458         return result;
 459 }
 460
 461 /**
 462  * onenand_wait - [DEFAULT] wait until the command is done
 463  * @param mtd           MTD device structure
 464  * @param state         state to select the max. timeout value
 465  *
 466  * Wait for command done. This applies to all OneNAND command
 467  * Read can take up to 30us, erase up to 2ms and program up to 350us
 468  * according to general OneNAND specs
 469  */
 470 static int onenand_wait(struct mtd_info *mtd, int state)
 471 {
 472         struct onenand_chip * this = mtd->priv;
 473         unsigned long timeout;
 474         unsigned int flags = ONENAND_INT_MASTER;
 475         unsigned int interrupt = 0;
 476         unsigned int ctrl;
 477
 478         /* The 20 msec is enough */
 479         timeout = jiffies + msecs_to_jiffies(20);
 480         while (time_before(jiffies, timeout)) {
 481                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 482
 483                 if (interrupt & flags)
 484                         break;
 485
 486                 if (state != FL_READING)
 487                         cond_resched();
 488         }
 489         /* To get correct interrupt status in timeout case */
 490         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 491
 492         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 493
 494         /*
 495          * In the Spec. it checks the controller status first
 496          * However if you get the correct information in case of
 497          * power off recovery (POR) test, it should read ECC status first
 498          */
 499         if (interrupt & ONENAND_INT_READ) {
 500                 int ecc = onenand_read_ecc(this);
 501                 if (ecc) {
 502                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 503                                 printk(KERN_ERR "%s: ECC error = 0x%04x\n",
 504                                         __func__, ecc);
 505                                 mtd->ecc_stats.failed++;
 506                                 return -EBADMSG;
 507                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 508                                 printk(KERN_DEBUG "%s: correctable ECC error = 0x%04x\n",
 509                                         __func__, ecc);
 510                                 mtd->ecc_stats.corrected++;
 511                         }
 512                 }
 513         } else if (state == FL_READING) {
 514                 printk(KERN_ERR "%s: read timeout! ctrl=0x%04x intr=0x%04x\n",
 515                         __func__, ctrl, interrupt);
 516                 return -EIO;
 517         }
 518
 519         /* If there's controller error, it's a real error */
 520         if (ctrl & ONENAND_CTRL_ERROR) {
 521                 printk(KERN_ERR "%s: controller error = 0x%04x\n",
 522                         __func__, ctrl);
 523                 if (ctrl & ONENAND_CTRL_LOCK)
 524                         printk(KERN_ERR "%s: it's locked error.\n", __func__);
 525                 return -EIO;
 526         }
 527
 528         return 0;
 529 }
 530
 531 /*
 532  * onenand_interrupt - [DEFAULT] onenand interrupt handler
 533  * @param irq           onenand interrupt number
 534  * @param dev_id        interrupt data
 535  *
 536  * complete the work
 537  */
 538 static irqreturn_t onenand_interrupt(int irq, void *data)
 539 {
 540         struct onenand_chip *this = data;
 541
 542         /* To handle shared interrupt */
 543         if (!this->complete.done)
 544                 complete(&this->complete);
 545
 546         return IRQ_HANDLED;
 547 }
 548
 549 /*
 550  * onenand_interrupt_wait - [DEFAULT] wait until the command is done
 551  * @param mtd           MTD device structure
 552  * @param state         state to select the max. timeout value
 553  *
 554  * Wait for command done.
 555  */
 556 static int onenand_interrupt_wait(struct mtd_info *mtd, int state)
 557 {
 558         struct onenand_chip *this = mtd->priv;
 559
 560         wait_for_completion(&this->complete);
 561
 562         return onenand_wait(mtd, state);
 563 }
 564
 565 /*
 566  * onenand_try_interrupt_wait - [DEFAULT] try interrupt wait
 567  * @param mtd           MTD device structure
 568  * @param state         state to select the max. timeout value
 569  *
 570  * Try interrupt based wait (It is used one-time)
 571  */
 572 static int onenand_try_interrupt_wait(struct mtd_info *mtd, int state)
 573 {
 574         struct onenand_chip *this = mtd->priv;
 575         unsigned long remain, timeout;
 576
 577         /* We use interrupt wait first */
 578         this->wait = onenand_interrupt_wait;
 579
 580         timeout = msecs_to_jiffies(100);
 581         remain = wait_for_completion_timeout(&this->complete, timeout);
 582         if (!remain) {
 583                 printk(KERN_INFO "OneNAND: There's no interrupt. "
 584                                 "We use the normal wait\n");
 585
 586                 /* Release the irq */
 587                 free_irq(this->irq, this);
 588
 589                 this->wait = onenand_wait;
 590         }
 591
 592         return onenand_wait(mtd, state);
 593 }
 594
 595 /*
 596  * onenand_setup_wait - [OneNAND Interface] setup onenand wait method
 597  * @param mtd           MTD device structure
 598  *
 599  * There's two method to wait onenand work
 600  * 1. polling - read interrupt status register
 601  * 2. interrupt - use the kernel interrupt method
 602  */
 603 static void onenand_setup_wait(struct mtd_info *mtd)
 604 {
 605         struct onenand_chip *this = mtd->priv;
 606         int syscfg;
 607
 608         init_completion(&this->complete);
 609
 610         if (this->irq <= 0) {
 611                 this->wait = onenand_wait;
 612                 return;
 613         }
 614
 615         if (request_irq(this->irq, &onenand_interrupt,
 616                                 IRQF_SHARED, "onenand", this)) {
 617                 /* If we can't get irq, use the normal wait */
 618                 this->wait = onenand_wait;
 619                 return;
 620         }
 621
 622         /* Enable interrupt */
 623         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
 624         syscfg |= ONENAND_SYS_CFG1_IOBE;
 625         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
 626
 627         this->wait = onenand_try_interrupt_wait;
 628 }
 629
 630 /**
 631  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 632  * @param mtd           MTD data structure
 633  * @param area          BufferRAM area
 634  * @return              offset given area
 635  *
 636  * Return BufferRAM offset given area
 637  */
 638 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 639 {
 640         struct onenand_chip *this = mtd->priv;
 641
 642         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 643                 /* Note: the 'this->writesize' is a real page size */
 644                 if (area == ONENAND_DATARAM)
 645                         return this->writesize;
 646                 if (area == ONENAND_SPARERAM)
 647                         return mtd->oobsize;
 648         }
 649
 650         return 0;
 651 }
 652
 653 /**
 654  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 655  * @param mtd           MTD data structure
 656  * @param area          BufferRAM area
 657  * @param buffer        the databuffer to put/get data
 658  * @param offset        offset to read from or write to
 659  * @param count         number of bytes to read/write
 660  *
 661  * Read the BufferRAM area
 662  */
 663 static int onenand_read_bufferram(struct mtd_info *mtd, int area,
 664                 unsigned char *buffer, int offset, size_t count)
 665 {
 666         struct onenand_chip *this = mtd->priv;
 667         void __iomem *bufferram;
 668
 669         bufferram = this->base + area;
 670
 671         bufferram += onenand_bufferram_offset(mtd, area);
 672
 673         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 674                 unsigned short word;
 675
 676                 /* Align with word(16-bit) size */
 677                 count--;
 678
 679                 /* Read word and save byte */
 680                 word = this->read_word(bufferram + offset + count);
 681                 buffer[count] = (word & 0xff);
 682         }
 683
 684         memcpy(buffer, bufferram + offset, count);
 685
 686         return 0;
 687 }
 688
 689 /**
 690  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 691  * @param mtd           MTD data structure
 692  * @param area          BufferRAM area
 693  * @param buffer        the databuffer to put/get data
 694  * @param offset        offset to read from or write to
 695  * @param count         number of bytes to read/write
 696  *
 697  * Read the BufferRAM area with Sync. Burst Mode
 698  */
 699 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 700                 unsigned char *buffer, int offset, size_t count)
 701 {
 702         struct onenand_chip *this = mtd->priv;
 703         void __iomem *bufferram;
 704
 705         bufferram = this->base + area;
 706
 707         bufferram += onenand_bufferram_offset(mtd, area);
 708
 709         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 710
 711         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 712                 unsigned short word;
 713
 714                 /* Align with word(16-bit) size */
 715                 count--;
 716
 717                 /* Read word and save byte */
 718                 word = this->read_word(bufferram + offset + count);
 719                 buffer[count] = (word & 0xff);
 720         }
 721
 722         memcpy(buffer, bufferram + offset, count);
 723
 724         this->mmcontrol(mtd, 0);
 725
 726         return 0;
 727 }
 728
 729 /**
 730  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 731  * @param mtd           MTD data structure
 732  * @param area          BufferRAM area
 733  * @param buffer        the databuffer to put/get data
 734  * @param offset        offset to read from or write to
 735  * @param count         number of bytes to read/write
 736  *
 737  * Write the BufferRAM area
 738  */
 739 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 740                 const unsigned char *buffer, int offset, size_t count)
 741 {
 742         struct onenand_chip *this = mtd->priv;
 743         void __iomem *bufferram;
 744
 745         bufferram = this->base + area;
 746
 747         bufferram += onenand_bufferram_offset(mtd, area);
 748
 749         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 750                 unsigned short word;
 751                 int byte_offset;
 752
 753                 /* Align with word(16-bit) size */
 754                 count--;
 755
 756                 /* Calculate byte access offset */
 757                 byte_offset = offset + count;
 758
 759                 /* Read word and save byte */
 760                 word = this->read_word(bufferram + byte_offset);
 761                 word = (word & ~0xff) | buffer[count];
 762                 this->write_word(word, bufferram + byte_offset);
 763         }
 764
 765         memcpy(bufferram + offset, buffer, count);
 766
 767         return 0;
 768 }
 769
 770 /**
 771  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 772  * @param mtd           MTD data structure
 773  * @param addr          address to check
 774  * @return              blockpage address
 775  *
 776  * Get blockpage address at 2x program mode
 777  */
 778 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 779 {
 780         struct onenand_chip *this = mtd->priv;
 781         int blockpage, block, page;
 782
 783         /* Calculate the even block number */
 784         block = (int) (addr >> this->erase_shift) & ~1;
 785         /* Is it the odd plane? */
 786         if (addr & this->writesize)
 787                 block++;
 788         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 789         blockpage = (block << 7) | page;
 790
 791         return blockpage;
 792 }
 793
 794 /**
 795  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 796  * @param mtd           MTD data structure
 797  * @param addr          address to check
 798  * @return              1 if there are valid data, otherwise 0
 799  *
 800  * Check bufferram if there is data we required
 801  */
 802 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 803 {
 804         struct onenand_chip *this = mtd->priv;
 805         int blockpage, found = 0;
 806         unsigned int i;
 807
 808         if (ONENAND_IS_2PLANE(this))
 809                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 810         else
 811                 blockpage = (int) (addr >> this->page_shift);
 812
 813         /* Is there valid data? */
 814         i = ONENAND_CURRENT_BUFFERRAM(this);
 815         if (this->bufferram[i].blockpage == blockpage)
 816                 found = 1;
 817         else {
 818                 /* Check another BufferRAM */
 819                 i = ONENAND_NEXT_BUFFERRAM(this);
 820                 if (this->bufferram[i].blockpage == blockpage) {
 821                         ONENAND_SET_NEXT_BUFFERRAM(this);
 822                         found = 1;
 823                 }
 824         }
 825
 826         if (found && ONENAND_IS_DDP(this)) {
 827                 /* Select DataRAM for DDP */
 828                 int block = onenand_block(this, addr);
 829                 int value = onenand_bufferram_address(this, block);
 830                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 831         }
 832
 833         return found;
 834 }
 835
 836 /**
 837  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 838  * @param mtd           MTD data structure
 839  * @param addr          address to update
 840  * @param valid         valid flag
 841  *
 842  * Update BufferRAM information
 843  */
 844 static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 845                 int valid)
 846 {
 847         struct onenand_chip *this = mtd->priv;
 848         int blockpage;
 849         unsigned int i;
 850
 851         if (ONENAND_IS_2PLANE(this))
 852                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 853         else
 854                 blockpage = (int) (addr >> this->page_shift);
 855
 856         /* Invalidate another BufferRAM */
 857         i = ONENAND_NEXT_BUFFERRAM(this);
 858         if (this->bufferram[i].blockpage == blockpage)
 859                 this->bufferram[i].blockpage = -1;
 860
 861         /* Update BufferRAM */
 862         i = ONENAND_CURRENT_BUFFERRAM(this);
 863         if (valid)
 864                 this->bufferram[i].blockpage = blockpage;
 865         else
 866                 this->bufferram[i].blockpage = -1;
 867 }
 868
 869 /**
 870  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 871  * @param mtd           MTD data structure
 872  * @param addr          start address to invalidate
 873  * @param len           length to invalidate
 874  *
 875  * Invalidate BufferRAM information
 876  */
 877 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 878                 unsigned int len)
 879 {
 880         struct onenand_chip *this = mtd->priv;
 881         int i;
 882         loff_t end_addr = addr + len;
 883
 884         /* Invalidate BufferRAM */
 885         for (i = 0; i < MAX_BUFFERRAM; i++) {
 886                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 887                 if (buf_addr >= addr && buf_addr < end_addr)
 888                         this->bufferram[i].blockpage = -1;
 889         }
 890 }
 891
 892 /**
 893  * onenand_get_device - [GENERIC] Get chip for selected access
 894  * @param mtd           MTD device structure
 895  * @param new_state     the state which is requested
 896  *
 897  * Get the device and lock it for exclusive access
 898  */
 899 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 900 {
 901         struct onenand_chip *this = mtd->priv;
 902         DECLARE_WAITQUEUE(wait, current);
 903
 904         /*
 905          * Grab the lock and see if the device is available
 906          */
 907         while (1) {
 908                 spin_lock(&this->chip_lock);
 909                 if (this->state == FL_READY) {
 910                         this->state = new_state;
 911                         spin_unlock(&this->chip_lock);
 912                         break;
 913                 }
 914                 if (new_state == FL_PM_SUSPENDED) {
 915                         spin_unlock(&this->chip_lock);
 916                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 917                 }
 918                 set_current_state(TASK_UNINTERRUPTIBLE);
 919                 add_wait_queue(&this->wq, &wait);
 920                 spin_unlock(&this->chip_lock);
 921                 schedule();
 922                 remove_wait_queue(&this->wq, &wait);
 923         }
 924
 925         return 0;
 926 }
 927
 928 /**
 929  * onenand_release_device - [GENERIC] release chip
 930  * @param mtd           MTD device structure
 931  *
 932  * Deselect, release chip lock and wake up anyone waiting on the device
 933  */
 934 static void onenand_release_device(struct mtd_info *mtd)
 935 {
 936         struct onenand_chip *this = mtd->priv;
 937
 938         /* Release the chip */
 939         spin_lock(&this->chip_lock);
 940         this->state = FL_READY;
 941         wake_up(&this->wq);
 942         spin_unlock(&this->chip_lock);
 943 }
 944
 945 /**
 946  * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
 947  * @param mtd           MTD device structure
 948  * @param buf           destination address
 949  * @param column        oob offset to read from
 950  * @param thislen       oob length to read
 951  */
 952 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,
 953                                 int thislen)
 954 {
 955         struct onenand_chip *this = mtd->priv;
 956         struct nand_oobfree *free;
 957         int readcol = column;
 958         int readend = column + thislen;
 959         int lastgap = 0;
 960         unsigned int i;
 961         uint8_t *oob_buf = this->oob_buf;
 962
 963         free = this->ecclayout->oobfree;
 964         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 965                 if (readcol >= lastgap)
 966                         readcol += free->offset - lastgap;
 967                 if (readend >= lastgap)
 968                         readend += free->offset - lastgap;
 969                 lastgap = free->offset + free->length;
 970         }
 971         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
 972         free = this->ecclayout->oobfree;
 973         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
 974                 int free_end = free->offset + free->length;
 975                 if (free->offset < readend && free_end > readcol) {
 976                         int st = max_t(int,free->offset,readcol);
 977                         int ed = min_t(int,free_end,readend);
 978                         int n = ed - st;
 979                         memcpy(buf, oob_buf + st, n);
 980                         buf += n;
 981                 } else if (column == 0)
 982                         break;
 983         }
 984         return 0;
 985 }
 986
 987 /**
 988  * onenand_recover_lsb - [Flex-OneNAND] Recover LSB page data
 989  * @param mtd           MTD device structure
 990  * @param addr          address to recover
 991  * @param status        return value from onenand_wait / onenand_bbt_wait
 992  *
 993  * MLC NAND Flash cell has paired pages - LSB page and MSB page. LSB page has
 994  * lower page address and MSB page has higher page address in paired pages.
 995  * If power off occurs during MSB page program, the paired LSB page data can
 996  * become corrupt. LSB page recovery read is a way to read LSB page though page
 997  * data are corrupted. When uncorrectable error occurs as a result of LSB page
 998  * read after power up, issue LSB page recovery read.
 999  */
1000 static int onenand_recover_lsb(struct mtd_info *mtd, loff_t addr, int status)
1001 {
1002         struct onenand_chip *this = mtd->priv;
1003         int i;
1004
1005         /* Recovery is only for Flex-OneNAND */
1006         if (!FLEXONENAND(this))
1007                 return status;
1008
1009         /* check if we failed due to uncorrectable error */
1010         if (status != -EBADMSG && status != ONENAND_BBT_READ_ECC_ERROR)
1011                 return status;
1012
1013         /* check if address lies in MLC region */
1014         i = flexonenand_region(mtd, addr);
1015         if (mtd->eraseregions[i].erasesize < (1 << this->erase_shift))
1016                 return status;
1017
1018         /* We are attempting to reread, so decrement stats.failed
1019          * which was incremented by onenand_wait due to read failure
1020          */
1021         printk(KERN_INFO "%s: Attempting to recover from uncorrectable read\n",
1022                 __func__);
1023         mtd->ecc_stats.failed--;
1024
1025         /* Issue the LSB page recovery command */
1026         this->command(mtd, FLEXONENAND_CMD_RECOVER_LSB, addr, this->writesize);
1027         return this->wait(mtd, FL_READING);
1028 }
1029
1030 /**
1031  * onenand_mlc_read_ops_nolock - MLC OneNAND read main and/or out-of-band
1032  * @param mtd           MTD device structure
1033  * @param from          offset to read from
1034  * @param ops:          oob operation description structure
1035  *
1036  * MLC OneNAND / Flex-OneNAND has 4KB page size and 4KB dataram.
1037  * So, read-while-load is not present.
1038  */
1039 static int onenand_mlc_read_ops_nolock(struct mtd_info *mtd, loff_t from,
1040                                 struct mtd_oob_ops *ops)
1041 {
1042         struct onenand_chip *this = mtd->priv;
1043         struct mtd_ecc_stats stats;
1044         size_t len = ops->len;
1045         size_t ooblen = ops->ooblen;
1046         u_char *buf = ops->datbuf;
1047         u_char *oobbuf = ops->oobbuf;
1048         int read = 0, column, thislen;
1049         int oobread = 0, oobcolumn, thisooblen, oobsize;
1050         int ret = 0;
1051         int writesize = this->writesize;
1052
1053         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %i\n",
1054                 (unsigned int) from, (int) len);
1055
1056         if (ops->mode == MTD_OOB_AUTO)
1057                 oobsize = this->ecclayout->oobavail;
1058         else
1059                 oobsize = mtd->oobsize;
1060
1061         oobcolumn = from & (mtd->oobsize - 1);
1062
1063         /* Do not allow reads past end of device */
1064         if (from + len > mtd->size) {
1065                 printk(KERN_ERR "%s: Attempt read beyond end of device\n",
1066                         __func__);
1067                 ops->retlen = 0;
1068                 ops->oobretlen = 0;
1069                 return -EINVAL;
1070         }
1071
1072         stats = mtd->ecc_stats;
1073
1074         while (read < len) {
1075                 cond_resched();
1076
1077                 thislen = min_t(int, writesize, len - read);
1078
1079                 column = from & (writesize - 1);
1080                 if (column + thislen > writesize)
1081                         thislen = writesize - column;
1082
1083                 if (!onenand_check_bufferram(mtd, from)) {
1084                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
1085
1086                         ret = this->wait(mtd, FL_READING);
1087                         if (unlikely(ret))
1088                                 ret = onenand_recover_lsb(mtd, from, ret);
1089                         onenand_update_bufferram(mtd, from, !ret);
1090                         if (ret == -EBADMSG)
1091                                 ret = 0;
1092                 }
1093
1094                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
1095                 if (oobbuf) {
1096                         thisooblen = oobsize - oobcolumn;
1097                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
1098
1099                         if (ops->mode == MTD_OOB_AUTO)
1100                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
1101                         else
1102                                 this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
1103                         oobread += thisooblen;
1104                         oobbuf += thisooblen;
1105                         oobcolumn = 0;
1106                 }
1107
1108                 read += thislen;
1109                 if (read == len)
1110                         break;
1111
1112                 from += thislen;
1113                 buf += thislen;
1114         }
1115
1116         /*
1117          * Return success, if no ECC failures, else -EBADMSG
1118          * fs driver will take care of that, because
1119          * retlen == desired len and result == -EBADMSG
1120          */
1121         ops->retlen = read;
1122         ops->oobretlen = oobread;
1123
1124         if (ret)
1125                 return ret;
1126
1127         if (mtd->ecc_stats.failed - stats.failed)
1128                 return -EBADMSG;
1129
1130         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
1131 }
1132
1133 /**
1134  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
1135  * @param mtd           MTD device structure
1136  * @param from          offset to read from
1137  * @param ops:          oob operation description structure
1138  *
1139  * OneNAND read main and/or out-of-band data
1140  */
1141 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
1142                                 struct mtd_oob_ops *ops)
1143 {
1144         struct onenand_chip *this = mtd->priv;
1145         struct mtd_ecc_stats stats;
1146         size_t len = ops->len;
1147         size_t ooblen = ops->ooblen;
1148         u_char *buf = ops->datbuf;
1149         u_char *oobbuf = ops->oobbuf;
1150         int read = 0, column, thislen;
1151         int oobread = 0, oobcolumn, thisooblen, oobsize;
1152         int ret = 0, boundary = 0;
1153         int writesize = this->writesize;
1154
1155         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %i\n",
1156                         __func__, (unsigned int) from, (int) len);
1157
1158         if (ops->mode == MTD_OOB_AUTO)
1159                 oobsize = this->ecclayout->oobavail;
1160         else
1161                 oobsize = mtd->oobsize;
1162
1163         oobcolumn = from & (mtd->oobsize - 1);
1164
1165         /* Do not allow reads past end of device */
1166         if ((from + len) > mtd->size) {
1167                 printk(KERN_ERR "%s: Attempt read beyond end of device\n",
1168                         __func__);
1169                 ops->retlen = 0;
1170                 ops->oobretlen = 0;
1171                 return -EINVAL;
1172         }
1173
1174         stats = mtd->ecc_stats;
1175
1176         /* Read-while-load method */
1177
1178         /* Do first load to bufferRAM */
1179         if (read < len) {
1180                 if (!onenand_check_bufferram(mtd, from)) {
1181                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
1182                         ret = this->wait(mtd, FL_READING);
1183                         onenand_update_bufferram(mtd, from, !ret);
1184                         if (ret == -EBADMSG)
1185                                 ret = 0;
1186                 }
1187         }
1188
1189         thislen = min_t(int, writesize, len - read);
1190         column = from & (writesize - 1);
1191         if (column + thislen > writesize)
1192                 thislen = writesize - column;
1193
1194         while (!ret) {
1195                 /* If there is more to load then start next load */
1196                 from += thislen;
1197                 if (read + thislen < len) {
1198                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
1199                         /*
1200                          * Chip boundary handling in DDP
1201                          * Now we issued chip 1 read and pointed chip 1
1202                          * bufferram so we have to point chip 0 bufferram.
1203                          */
1204                         if (ONENAND_IS_DDP(this) &&
1205                             unlikely(from == (this->chipsize >> 1))) {
1206                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
1207                                 boundary = 1;
1208                         } else
1209                                 boundary = 0;
1210                         ONENAND_SET_PREV_BUFFERRAM(this);
1211                 }
1212                 /* While load is going, read from last bufferRAM */
1213                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
1214
1215                 /* Read oob area if needed */
1216                 if (oobbuf) {
1217                         thisooblen = oobsize - oobcolumn;
1218                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
1219
1220                         if (ops->mode == MTD_OOB_AUTO)
1221                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
1222                         else
1223                                 this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
1224                         oobread += thisooblen;
1225                         oobbuf += thisooblen;
1226                         oobcolumn = 0;
1227                 }
1228
1229                 /* See if we are done */
1230                 read += thislen;
1231                 if (read == len)
1232                         break;
1233                 /* Set up for next read from bufferRAM */
1234                 if (unlikely(boundary))
1235                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
1236                 ONENAND_SET_NEXT_BUFFERRAM(this);
1237                 buf += thislen;
1238                 thislen = min_t(int, writesize, len - read);
1239                 column = 0;
1240                 cond_resched();
1241                 /* Now wait for load */
1242                 ret = this->wait(mtd, FL_READING);
1243                 onenand_update_bufferram(mtd, from, !ret);
1244                 if (ret == -EBADMSG)
1245                         ret = 0;
1246         }
1247
1248         /*
1249          * Return success, if no ECC failures, else -EBADMSG
1250          * fs driver will take care of that, because
1251          * retlen == desired len and result == -EBADMSG
1252          */
1253         ops->retlen = read;
1254         ops->oobretlen = oobread;
1255
1256         if (ret)
1257                 return ret;
1258
1259         if (mtd->ecc_stats.failed - stats.failed)
1260                 return -EBADMSG;
1261
1262         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
1263 }
1264
1265 /**
1266  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
1267  * @param mtd           MTD device structure
1268  * @param from          offset to read from
1269  * @param ops:          oob operation description structure
1270  *
1271  * OneNAND read out-of-band data from the spare area
1272  */
1273 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
1274                         struct mtd_oob_ops *ops)
1275 {
1276         struct onenand_chip *this = mtd->priv;
1277         struct mtd_ecc_stats stats;
1278         int read = 0, thislen, column, oobsize;
1279         size_t len = ops->ooblen;
1280         mtd_oob_mode_t mode = ops->mode;
1281         u_char *buf = ops->oobbuf;
1282         int ret = 0, readcmd;
1283
1284         from += ops->ooboffs;
1285
1286         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %i\n",
1287                 __func__, (unsigned int) from, (int) len);
1288
1289         /* Initialize return length value */
1290         ops->oobretlen = 0;
1291
1292         if (mode == MTD_OOB_AUTO)
1293                 oobsize = this->ecclayout->oobavail;
1294         else
1295                 oobsize = mtd->oobsize;
1296
1297         column = from & (mtd->oobsize - 1);
1298
1299         if (unlikely(column >= oobsize)) {
1300                 printk(KERN_ERR "%s: Attempted to start read outside oob\n",
1301                         __func__);
1302                 return -EINVAL;
1303         }
1304
1305         /* Do not allow reads past end of device */
1306         if (unlikely(from >= mtd->size ||
1307                      column + len > ((mtd->size >> this->page_shift) -
1308                                      (from >> this->page_shift)) * oobsize)) {
1309                 printk(KERN_ERR "%s: Attempted to read beyond end of device\n",
1310                         __func__);
1311                 return -EINVAL;
1312         }
1313
1314         stats = mtd->ecc_stats;
1315
1316         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1317
1318         while (read < len) {
1319                 cond_resched();
1320
1321                 thislen = oobsize - column;
1322                 thislen = min_t(int, thislen, len);
1323
1324                 this->command(mtd, readcmd, from, mtd->oobsize);
1325
1326                 onenand_update_bufferram(mtd, from, 0);
1327
1328                 ret = this->wait(mtd, FL_READING);
1329                 if (unlikely(ret))
1330                         ret = onenand_recover_lsb(mtd, from, ret);
1331
1332                 if (ret && ret != -EBADMSG) {
1333                         printk(KERN_ERR "%s: read failed = 0x%x\n",
1334                                 __func__, ret);
1335                         break;
1336                 }
1337
1338                 if (mode == MTD_OOB_AUTO)
1339                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
1340                 else
1341                         this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1342
1343                 read += thislen;
1344
1345                 if (read == len)
1346                         break;
1347
1348                 buf += thislen;
1349
1350                 /* Read more? */
1351                 if (read < len) {
1352                         /* Page size */
1353                         from += mtd->writesize;
1354                         column = 0;
1355                 }
1356         }
1357
1358         ops->oobretlen = read;
1359
1360         if (ret)
1361                 return ret;
1362
1363         if (mtd->ecc_stats.failed - stats.failed)
1364                 return -EBADMSG;
1365
1366         return 0;
1367 }
1368
1369 /**
1370  * onenand_read - [MTD Interface] Read data from flash
1371  * @param mtd           MTD device structure
1372  * @param from          offset to read from
1373  * @param len           number of bytes to read
1374  * @param retlen        pointer to variable to store the number of read bytes
1375  * @param buf           the databuffer to put data
1376  *
1377  * Read with ecc
1378 */
1379 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
1380         size_t *retlen, u_char *buf)
1381 {
1382         struct onenand_chip *this = mtd->priv;
1383         struct mtd_oob_ops ops = {
1384                 .len    = len,
1385                 .ooblen = 0,
1386                 .datbuf = buf,
1387                 .oobbuf = NULL,
1388         };
1389         int ret;
1390
1391         onenand_get_device(mtd, FL_READING);
1392         ret = ONENAND_IS_MLC(this) ?
1393                 onenand_mlc_read_ops_nolock(mtd, from, &ops) :
1394                 onenand_read_ops_nolock(mtd, from, &ops);
1395         onenand_release_device(mtd);
1396
1397         *retlen = ops.retlen;
1398         return ret;
1399 }
1400
1401 /**
1402  * onenand_read_oob - [MTD Interface] Read main and/or out-of-band
1403  * @param mtd:          MTD device structure
1404  * @param from:         offset to read from
1405  * @param ops:          oob operation description structure
1406
1407  * Read main and/or out-of-band
1408  */
1409 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
1410                             struct mtd_oob_ops *ops)
1411 {
1412         struct onenand_chip *this = mtd->priv;
1413         int ret;
1414
1415         switch (ops->mode) {
1416         case MTD_OOB_PLACE:
1417         case MTD_OOB_AUTO:
1418                 break;
1419         case MTD_OOB_RAW:
1420                 /* Not implemented yet */
1421         default:
1422                 return -EINVAL;
1423         }
1424
1425         onenand_get_device(mtd, FL_READING);
1426         if (ops->datbuf)
1427                 ret = ONENAND_IS_MLC(this) ?
1428                         onenand_mlc_read_ops_nolock(mtd, from, ops) :
1429                         onenand_read_ops_nolock(mtd, from, ops);
1430         else
1431                 ret = onenand_read_oob_nolock(mtd, from, ops);
1432         onenand_release_device(mtd);
1433
1434         return ret;
1435 }
1436
1437 /**
1438  * onenand_bbt_wait - [DEFAULT] wait until the command is done
1439  * @param mtd           MTD device structure
1440  * @param state         state to select the max. timeout value
1441  *
1442  * Wait for command done.
1443  */
1444 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
1445 {
1446         struct onenand_chip *this = mtd->priv;
1447         unsigned long timeout;
1448         unsigned int interrupt;
1449         unsigned int ctrl;
1450
1451         /* The 20 msec is enough */
1452         timeout = jiffies + msecs_to_jiffies(20);
1453         while (time_before(jiffies, timeout)) {
1454                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1455                 if (interrupt & ONENAND_INT_MASTER)
1456                         break;
1457         }
1458         /* To get correct interrupt status in timeout case */
1459         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1460         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
1461
1462         if (interrupt & ONENAND_INT_READ) {
1463                 int ecc = onenand_read_ecc(this);
1464                 if (ecc & ONENAND_ECC_2BIT_ALL) {
1465                         printk(KERN_WARNING "%s: ecc error = 0x%04x, "
1466                                 "controller error 0x%04x\n",
1467                                 __func__, ecc, ctrl);
1468                         return ONENAND_BBT_READ_ECC_ERROR;
1469                 }
1470         } else {
1471                 printk(KERN_ERR "%s: read timeout! ctrl=0x%04x intr=0x%04x\n",
1472                         __func__, ctrl, interrupt);
1473                 return ONENAND_BBT_READ_FATAL_ERROR;
1474         }
1475
1476         /* Initial bad block case: 0x2400 or 0x0400 */
1477         if (ctrl & ONENAND_CTRL_ERROR) {
1478                 printk(KERN_DEBUG "%s: controller error = 0x%04x\n",
1479                         __func__, ctrl);
1480                 return ONENAND_BBT_READ_ERROR;
1481         }
1482
1483         return 0;
1484 }
1485
1486 /**
1487  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
1488  * @param mtd           MTD device structure
1489  * @param from          offset to read from
1490  * @param ops           oob operation description structure
1491  *
1492  * OneNAND read out-of-band data from the spare area for bbt scan
1493  */
1494 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
1495                             struct mtd_oob_ops *ops)
1496 {
1497         struct onenand_chip *this = mtd->priv;
1498         int read = 0, thislen, column;
1499         int ret = 0, readcmd;
1500         size_t len = ops->ooblen;
1501         u_char *buf = ops->oobbuf;
1502
1503         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %zi\n",
1504                 __func__, (unsigned int) from, len);
1505
1506         /* Initialize return value */
1507         ops->oobretlen = 0;
1508
1509         /* Do not allow reads past end of device */
1510         if (unlikely((from + len) > mtd->size)) {
1511                 printk(KERN_ERR "%s: Attempt read beyond end of device\n",
1512                         __func__);
1513                 return ONENAND_BBT_READ_FATAL_ERROR;
1514         }
1515
1516         /* Grab the lock and see if the device is available */
1517         onenand_get_device(mtd, FL_READING);
1518
1519         column = from & (mtd->oobsize - 1);
1520
1521         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1522
1523         while (read < len) {
1524                 cond_resched();
1525
1526                 thislen = mtd->oobsize - column;
1527                 thislen = min_t(int, thislen, len);
1528
1529                 this->command(mtd, readcmd, from, mtd->oobsize);
1530
1531                 onenand_update_bufferram(mtd, from, 0);
1532
1533                 ret = this->bbt_wait(mtd, FL_READING);
1534                 if (unlikely(ret))
1535                         ret = onenand_recover_lsb(mtd, from, ret);
1536
1537                 if (ret)
1538                         break;
1539
1540                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1541                 read += thislen;
1542                 if (read == len)
1543                         break;
1544
1545                 buf += thislen;
1546
1547                 /* Read more? */
1548                 if (read < len) {
1549                         /* Update Page size */
1550                         from += this->writesize;
1551                         column = 0;
1552                 }
1553         }
1554
1555         /* Deselect and wake up anyone waiting on the device */
1556         onenand_release_device(mtd);
1557
1558         ops->oobretlen = read;
1559         return ret;
1560 }
1561
1562 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1563 /**
1564  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1565  * @param mtd           MTD device structure
1566  * @param buf           the databuffer to verify
1567  * @param to            offset to read from
1568  */
1569 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1570 {
1571         struct onenand_chip *this = mtd->priv;
1572         u_char *oob_buf = this->oob_buf;
1573         int status, i, readcmd;
1574
1575         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1576
1577         this->command(mtd, readcmd, to, mtd->oobsize);
1578         onenand_update_bufferram(mtd, to, 0);
1579         status = this->wait(mtd, FL_READING);
1580         if (status)
1581                 return status;
1582
1583         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1584         for (i = 0; i < mtd->oobsize; i++)
1585                 if (buf[i] != 0xFF && buf[i] != oob_buf[i])
1586                         return -EBADMSG;
1587
1588         return 0;
1589 }
1590
1591 /**
1592  * onenand_verify - [GENERIC] verify the chip contents after a write
1593  * @param mtd          MTD device structure
1594  * @param buf          the databuffer to verify
1595  * @param addr         offset to read from
1596  * @param len          number of bytes to read and compare
1597  */
1598 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1599 {
1600         struct onenand_chip *this = mtd->priv;
1601         void __iomem *dataram;
1602         int ret = 0;
1603         int thislen, column;
1604
1605         while (len != 0) {
1606                 thislen = min_t(int, this->writesize, len);
1607                 column = addr & (this->writesize - 1);
1608                 if (column + thislen > this->writesize)
1609                         thislen = this->writesize - column;
1610
1611                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1612
1613                 onenand_update_bufferram(mtd, addr, 0);
1614
1615                 ret = this->wait(mtd, FL_READING);
1616                 if (ret)
1617                         return ret;
1618
1619                 onenand_update_bufferram(mtd, addr, 1);
1620
1621                 dataram = this->base + ONENAND_DATARAM;
1622                 dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
1623
1624                 if (memcmp(buf, dataram + column, thislen))
1625                         return -EBADMSG;
1626
1627                 len -= thislen;
1628                 buf += thislen;
1629                 addr += thislen;
1630         }
1631
1632         return 0;
1633 }
1634 #else
1635 #define onenand_verify(...)             (0)
1636 #define onenand_verify_oob(...)         (0)
1637 #endif
1638
1639 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1640
1641 static void onenand_panic_wait(struct mtd_info *mtd)
1642 {
1643         struct onenand_chip *this = mtd->priv;
1644         unsigned int interrupt;
1645         int i;
1646
1647         for (i = 0; i < 2000; i++) {
1648                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1649                 if (interrupt & ONENAND_INT_MASTER)
1650                         break;
1651                 udelay(10);
1652         }
1653 }
1654
1655 /**
1656  * onenand_panic_write - [MTD Interface] write buffer to FLASH in a panic context
1657  * @param mtd           MTD device structure
1658  * @param to            offset to write to
1659  * @param len           number of bytes to write
1660  * @param retlen        pointer to variable to store the number of written bytes
1661  * @param buf           the data to write
1662  *
1663  * Write with ECC
1664  */
1665 static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
1666                          size_t *retlen, const u_char *buf)
1667 {
1668         struct onenand_chip *this = mtd->priv;
1669         int column, subpage;
1670         int written = 0;
1671         int ret = 0;
1672
1673         if (this->state == FL_PM_SUSPENDED)
1674                 return -EBUSY;
1675
1676         /* Wait for any existing operation to clear */
1677         onenand_panic_wait(mtd);
1678
1679         DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n",
1680                 __func__, (unsigned int) to, (int) len);
1681
1682         /* Initialize retlen, in case of early exit */
1683         *retlen = 0;
1684
1685         /* Do not allow writes past end of device */
1686         if (unlikely((to + len) > mtd->size)) {
1687                 printk(KERN_ERR "%s: Attempt write to past end of device\n",
1688                         __func__);
1689                 return -EINVAL;
1690         }
1691
1692         /* Reject writes, which are not page aligned */
1693         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1694                 printk(KERN_ERR "%s: Attempt to write not page aligned data\n",
1695                         __func__);
1696                 return -EINVAL;
1697         }
1698
1699         column = to & (mtd->writesize - 1);
1700
1701         /* Loop until all data write */
1702         while (written < len) {
1703                 int thislen = min_t(int, mtd->writesize - column, len - written);
1704                 u_char *wbuf = (u_char *) buf;
1705
1706                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1707
1708                 /* Partial page write */
1709                 subpage = thislen < mtd->writesize;
1710                 if (subpage) {
1711                         memset(this->page_buf, 0xff, mtd->writesize);
1712                         memcpy(this->page_buf + column, buf, thislen);
1713                         wbuf = this->page_buf;
1714                 }
1715
1716                 this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1717                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
1718
1719                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1720
1721                 onenand_panic_wait(mtd);
1722
1723                 /* In partial page write we don't update bufferram */
1724                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1725                 if (ONENAND_IS_2PLANE(this)) {
1726                         ONENAND_SET_BUFFERRAM1(this);
1727                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1728                 }
1729
1730                 if (ret) {
1731                         printk(KERN_ERR "%s: write failed %d\n", __func__, ret);
1732                         break;
1733                 }
1734
1735                 written += thislen;
1736
1737                 if (written == len)
1738                         break;
1739
1740                 column = 0;
1741                 to += thislen;
1742                 buf += thislen;
1743         }
1744
1745         *retlen = written;
1746         return ret;
1747 }
1748
1749 /**
1750  * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
1751  * @param mtd           MTD device structure
1752  * @param oob_buf       oob buffer
1753  * @param buf           source address
1754  * @param column        oob offset to write to
1755  * @param thislen       oob length to write
1756  */
1757 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1758                                   const u_char *buf, int column, int thislen)
1759 {
1760         struct onenand_chip *this = mtd->priv;
1761         struct nand_oobfree *free;
1762         int writecol = column;
1763         int writeend = column + thislen;
1764         int lastgap = 0;
1765         unsigned int i;
1766
1767         free = this->ecclayout->oobfree;
1768         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1769                 if (writecol >= lastgap)
1770                         writecol += free->offset - lastgap;
1771                 if (writeend >= lastgap)
1772                         writeend += free->offset - lastgap;
1773                 lastgap = free->offset + free->length;
1774         }
1775         free = this->ecclayout->oobfree;
1776         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1777                 int free_end = free->offset + free->length;
1778                 if (free->offset < writeend && free_end > writecol) {
1779                         int st = max_t(int,free->offset,writecol);
1780                         int ed = min_t(int,free_end,writeend);
1781                         int n = ed - st;
1782                         memcpy(oob_buf + st, buf, n);
1783                         buf += n;
1784                 } else if (column == 0)
1785                         break;
1786         }
1787         return 0;
1788 }
1789
1790 /**
1791  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1792  * @param mtd           MTD device structure
1793  * @param to            offset to write to
1794  * @param ops           oob operation description structure
1795  *
1796  * Write main and/or oob with ECC
1797  */
1798 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1799                                 struct mtd_oob_ops *ops)
1800 {
1801         struct onenand_chip *this = mtd->priv;
1802         int written = 0, column, thislen = 0, subpage = 0;
1803         int prev = 0, prevlen = 0, prev_subpage = 0, first = 1;
1804         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1805         size_t len = ops->len;
1806         size_t ooblen = ops->ooblen;
1807         const u_char *buf = ops->datbuf;
1808         const u_char *oob = ops->oobbuf;
1809         u_char *oobbuf;
1810         int ret = 0;
1811
1812         DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n",
1813                 __func__, (unsigned int) to, (int) len);
1814
1815         /* Initialize retlen, in case of early exit */
1816         ops->retlen = 0;
1817         ops->oobretlen = 0;
1818
1819         /* Do not allow writes past end of device */
1820         if (unlikely((to + len) > mtd->size)) {
1821                 printk(KERN_ERR "%s: Attempt write to past end of device\n",
1822                         __func__);
1823                 return -EINVAL;
1824         }
1825
1826         /* Reject writes, which are not page aligned */
1827         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1828                 printk(KERN_ERR "%s: Attempt to write not page aligned data\n",
1829                         __func__);
1830                 return -EINVAL;
1831         }
1832
1833         /* Check zero length */
1834         if (!len)
1835                 return 0;
1836
1837         if (ops->mode == MTD_OOB_AUTO)
1838                 oobsize = this->ecclayout->oobavail;
1839         else
1840                 oobsize = mtd->oobsize;
1841
1842         oobcolumn = to & (mtd->oobsize - 1);
1843
1844         column = to & (mtd->writesize - 1);
1845
1846         /* Loop until all data write */
1847         while (1) {
1848                 if (written < len) {
1849                         u_char *wbuf = (u_char *) buf;
1850
1851                         thislen = min_t(int, mtd->writesize - column, len - written);
1852                         thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1853
1854                         cond_resched();
1855
1856                         this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1857
1858                         /* Partial page write */
1859                         subpage = thislen < mtd->writesize;
1860                         if (subpage) {
1861                                 memset(this->page_buf, 0xff, mtd->writesize);
1862                                 memcpy(this->page_buf + column, buf, thislen);
1863                                 wbuf = this->page_buf;
1864                         }
1865
1866                         this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1867
1868                         if (oob) {
1869                                 oobbuf = this->oob_buf;
1870
1871                                 /* We send data to spare ram with oobsize
1872                                  * to prevent byte access */
1873                                 memset(oobbuf, 0xff, mtd->oobsize);
1874                                 if (ops->mode == MTD_OOB_AUTO)
1875                                         onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1876                                 else
1877                                         memcpy(oobbuf + oobcolumn, oob, thisooblen);
1878
1879                                 oobwritten += thisooblen;
1880                                 oob += thisooblen;
1881                                 oobcolumn = 0;
1882                         } else
1883                                 oobbuf = (u_char *) ffchars;
1884
1885                         this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1886                 } else
1887                         ONENAND_SET_NEXT_BUFFERRAM(this);
1888
1889                 /*
1890                  * 2 PLANE, MLC, and Flex-OneNAND do not support
1891                  * write-while-program feature.
1892                  */
1893                 if (!ONENAND_IS_2PLANE(this) && !first) {
1894                         ONENAND_SET_PREV_BUFFERRAM(this);
1895
1896                         ret = this->wait(mtd, FL_WRITING);
1897
1898                         /* In partial page write we don't update bufferram */
1899                         onenand_update_bufferram(mtd, prev, !ret && !prev_subpage);
1900                         if (ret) {
1901                                 written -= prevlen;
1902                                 printk(KERN_ERR "%s: write failed %d\n",
1903                                         __func__, ret);
1904                                 break;
1905                         }
1906
1907                         if (written == len) {
1908                                 /* Only check verify write turn on */
1909                                 ret = onenand_verify(mtd, buf - len, to - len, len);
1910                                 if (ret)
1911                                         printk(KERN_ERR "%s: verify failed %d\n",
1912                                                 __func__, ret);
1913                                 break;
1914                         }
1915
1916                         ONENAND_SET_NEXT_BUFFERRAM(this);
1917                 }
1918
1919                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1920
1921                 /*
1922                  * 2 PLANE, MLC, and Flex-OneNAND wait here
1923                  */
1924                 if (ONENAND_IS_2PLANE(this)) {
1925                         ret = this->wait(mtd, FL_WRITING);
1926
1927                         /* In partial page write we don't update bufferram */
1928                         onenand_update_bufferram(mtd, to, !ret && !subpage);
1929                         if (ret) {
1930                                 printk(KERN_ERR "%s: write failed %d\n",
1931                                         __func__, ret);
1932                                 break;
1933                         }
1934
1935                         /* Only check verify write turn on */
1936                         ret = onenand_verify(mtd, buf, to, thislen);
1937                         if (ret) {
1938                                 printk(KERN_ERR "%s: verify failed %d\n",
1939                                         __func__, ret);
1940                                 break;
1941                         }
1942
1943                         written += thislen;
1944
1945                         if (written == len)
1946                                 break;
1947
1948                 } else
1949                         written += thislen;
1950
1951                 column = 0;
1952                 prev_subpage = subpage;
1953                 prev = to;
1954                 prevlen = thislen;
1955                 to += thislen;
1956                 buf += thislen;
1957                 first = 0;
1958         }
1959
1960         /* In error case, clear all bufferrams */
1961         if (written != len)
1962                 onenand_invalidate_bufferram(mtd, 0, -1);
1963
1964         ops->retlen = written;
1965         ops->oobretlen = oobwritten;
1966
1967         return ret;
1968 }
1969
1970
1971 /**
1972  * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
1973  * @param mtd           MTD device structure
1974  * @param to            offset to write to
1975  * @param len           number of bytes to write
1976  * @param retlen        pointer to variable to store the number of written bytes
1977  * @param buf           the data to write
1978  * @param mode          operation mode
1979  *
1980  * OneNAND write out-of-band
1981  */
1982 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
1983                                     struct mtd_oob_ops *ops)
1984 {
1985         struct onenand_chip *this = mtd->priv;
1986         int column, ret = 0, oobsize;
1987         int written = 0, oobcmd;
1988         u_char *oobbuf;
1989         size_t len = ops->ooblen;
1990         const u_char *buf = ops->oobbuf;
1991         mtd_oob_mode_t mode = ops->mode;
1992
1993         to += ops->ooboffs;
1994
1995         DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n",
1996                 __func__, (unsigned int) to, (int) len);
1997
1998         /* Initialize retlen, in case of early exit */
1999         ops->oobretlen = 0;
2000
2001         if (mode == MTD_OOB_AUTO)
2002                 oobsize = this->ecclayout->oobavail;
2003         else
2004                 oobsize = mtd->oobsize;
2005
2006         column = to & (mtd->oobsize - 1);
2007
2008         if (unlikely(column >= oobsize)) {
2009                 printk(KERN_ERR "%s: Attempted to start write outside oob\n",
2010                         __func__);
2011                 return -EINVAL;
2012         }
2013
2014         /* For compatibility with NAND: Do not allow write past end of page */
2015         if (unlikely(column + len > oobsize)) {
2016                 printk(KERN_ERR "%s: Attempt to write past end of page\n",
2017                         __func__);
2018                 return -EINVAL;
2019         }
2020
2021         /* Do not allow reads past end of device */
2022         if (unlikely(to >= mtd->size ||
2023                      column + len > ((mtd->size >> this->page_shift) -
2024                                      (to >> this->page_shift)) * oobsize)) {
2025                 printk(KERN_ERR "%s: Attempted to write past end of device\n"
2026                         __func__);
2027                 return -EINVAL;
2028         }
2029
2030         oobbuf = this->oob_buf;
2031
2032         oobcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_PROG : ONENAND_CMD_PROGOOB;
2033
2034         /* Loop until all data write */
2035         while (written < len) {
2036                 int thislen = min_t(int, oobsize, len - written);
2037
2038                 cond_resched();
2039
2040                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
2041
2042                 /* We send data to spare ram with oobsize
2043                  * to prevent byte access */
2044                 memset(oobbuf, 0xff, mtd->oobsize);
2045                 if (mode == MTD_OOB_AUTO)
2046                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
2047                 else
2048                         memcpy(oobbuf + column, buf, thislen);
2049                 this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
2050
2051                 if (ONENAND_IS_MLC(this)) {
2052                         /* Set main area of DataRAM to 0xff*/
2053                         memset(this->page_buf, 0xff, mtd->writesize);
2054                         this->write_bufferram(mtd, ONENAND_DATARAM,
2055                                          this->page_buf, 0, mtd->writesize);
2056                 }
2057
2058                 this->command(mtd, oobcmd, to, mtd->oobsize);
2059
2060                 onenand_update_bufferram(mtd, to, 0);
2061                 if (ONENAND_IS_2PLANE(this)) {
2062                         ONENAND_SET_BUFFERRAM1(this);
2063                         onenand_update_bufferram(mtd, to + this->writesize, 0);
2064                 }
2065
2066                 ret = this->wait(mtd, FL_WRITING);
2067                 if (ret) {
2068                         printk(KERN_ERR "%s: write failed %d\n", __func__, ret);
2069                         break;
2070                 }
2071
2072                 ret = onenand_verify_oob(mtd, oobbuf, to);
2073                 if (ret) {
2074                         printk(KERN_ERR "%s: verify failed %d\n",
2075                                 __func__, ret);
2076                         break;
2077                 }
2078
2079                 written += thislen;
2080                 if (written == len)
2081                         break;
2082
2083                 to += mtd->writesize;
2084                 buf += thislen;
2085                 column = 0;
2086         }
2087
2088         ops->oobretlen = written;
2089
2090         return ret;
2091 }
2092
2093 /**
2094  * onenand_write - [MTD Interface] write buffer to FLASH
2095  * @param mtd           MTD device structure
2096  * @param to            offset to write to
2097  * @param len           number of bytes to write
2098  * @param retlen        pointer to variable to store the number of written bytes
2099  * @param buf           the data to write
2100  *
2101  * Write with ECC
2102  */
2103 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
2104         size_t *retlen, const u_char *buf)
2105 {
2106         struct mtd_oob_ops ops = {
2107                 .len    = len,
2108                 .ooblen = 0,
2109                 .datbuf = (u_char *) buf,
2110                 .oobbuf = NULL,
2111         };
2112         int ret;
2113
2114         onenand_get_device(mtd, FL_WRITING);
2115         ret = onenand_write_ops_nolock(mtd, to, &ops);
2116         onenand_release_device(mtd);
2117
2118         *retlen = ops.retlen;
2119         return ret;
2120 }
2121
2122 /**
2123  * onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band
2124  * @param mtd:          MTD device structure
2125  * @param to:           offset to write
2126  * @param ops:          oob operation description structure
2127  */
2128 static int onenand_write_oob(struct mtd_info *mtd, loff_t to,
2129                              struct mtd_oob_ops *ops)
2130 {
2131         int ret;
2132
2133         switch (ops->mode) {
2134         case MTD_OOB_PLACE:
2135         case MTD_OOB_AUTO:
2136                 break;
2137         case MTD_OOB_RAW:
2138                 /* Not implemented yet */
2139         default:
2140                 return -EINVAL;
2141         }
2142
2143         onenand_get_device(mtd, FL_WRITING);
2144         if (ops->datbuf)
2145                 ret = onenand_write_ops_nolock(mtd, to, ops);
2146         else
2147                 ret = onenand_write_oob_nolock(mtd, to, ops);
2148         onenand_release_device(mtd);
2149
2150         return ret;
2151 }
2152
2153 /**
2154  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
2155  * @param mtd           MTD device structure
2156  * @param ofs           offset from device start
2157  * @param allowbbt      1, if its allowed to access the bbt area
2158  *
2159  * Check, if the block is bad. Either by reading the bad block table or
2160  * calling of the scan function.
2161  */
2162 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
2163 {
2164         struct onenand_chip *this = mtd->priv;
2165         struct bbm_info *bbm = this->bbm;
2166
2167         /* Return info from the table */
2168         return bbm->isbad_bbt(mtd, ofs, allowbbt);
2169 }
2170
2171 /**
2172  * onenand_erase - [MTD Interface] erase block(s)
2173  * @param mtd           MTD device structure
2174  * @param instr         erase instruction
2175  *
2176  * Erase one ore more blocks
2177  */
2178 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
2179 {
2180         struct onenand_chip *this = mtd->priv;
2181         unsigned int block_size;
2182         loff_t addr = instr->addr;
2183         loff_t len = instr->len;
2184         int ret = 0, i;
2185         struct mtd_erase_region_info *region = NULL;
2186         loff_t region_end = 0;
2187
2188         DEBUG(MTD_DEBUG_LEVEL3, "onenand_erase: start = 0x%012llx, len = %llu\n", (unsigned long long) instr->addr, (unsigned long long) instr->len);
2189
2190         /* Do not allow erase past end of device */
2191         if (unlikely((len + addr) > mtd->size)) {
2192                 printk(KERN_ERR "%s: Erase past end of device\n", __func__);
2193                 return -EINVAL;
2194         }
2195
2196         if (FLEXONENAND(this)) {
2197                 /* Find the eraseregion of this address */
2198                 i = flexonenand_region(mtd, addr);
2199                 region = &mtd->eraseregions[i];
2200
2201                 block_size = region->erasesize;
2202                 region_end = region->offset + region->erasesize * region->numblocks;
2203
2204                 /* Start address within region must align on block boundary.
2205                  * Erase region's start offset is always block start address.
2206                  */
2207                 if (unlikely((addr - region->offset) & (block_size - 1))) {
2208                         printk(KERN_ERR "%s: Unaligned address\n", __func__);
2209                         return -EINVAL;
2210                 }
2211         } else {
2212                 block_size = 1 << this->erase_shift;
2213
2214                 /* Start address must align on block boundary */
2215                 if (unlikely(addr & (block_size - 1))) {
2216                         printk(KERN_ERR "%s: Unaligned address\n", __func__);
2217                         return -EINVAL;
2218                 }
2219         }
2220
2221         /* Length must align on block boundary */
2222         if (unlikely(len & (block_size - 1))) {
2223                 printk(KERN_ERR "%s: Length not block aligned\n", __func__);
2224                 return -EINVAL;
2225         }
2226
2227         instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
2228
2229         /* Grab the lock and see if the device is available */
2230         onenand_get_device(mtd, FL_ERASING);
2231
2232         /* Loop through the blocks */
2233         instr->state = MTD_ERASING;
2234
2235         while (len) {
2236                 cond_resched();
2237
2238                 /* Check if we have a bad block, we do not erase bad blocks */
2239                 if (onenand_block_isbad_nolock(mtd, addr, 0)) {
2240                         printk(KERN_WARNING "%s: attempt to erase a bad block "
2241                                         "at addr 0x%012llx\n",
2242                                         __func__, (unsigned long long) addr);
2243                         instr->state = MTD_ERASE_FAILED;
2244                         goto erase_exit;
2245                 }
2246
2247                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
2248
2249                 onenand_invalidate_bufferram(mtd, addr, block_size);
2250
2251                 ret = this->wait(mtd, FL_ERASING);
2252                 /* Check, if it is write protected */
2253                 if (ret) {
2254                         printk(KERN_ERR "%s: Failed erase, block %d\n",
2255                                 __func__, onenand_block(this, addr));
2256                         instr->state = MTD_ERASE_FAILED;
2257                         instr->fail_addr = addr;
2258                         goto erase_exit;
2259                 }
2260
2261                 len -= block_size;
2262                 addr += block_size;
2263
2264                 if (addr == region_end) {
2265                         if (!len)
2266                                 break;
2267                         region++;
2268
2269                         block_size = region->erasesize;
2270                         region_end = region->offset + region->erasesize * region->numblocks;
2271
2272                         if (len & (block_size - 1)) {
2273                                 /* FIXME: This should be handled at MTD partitioning level. */
2274                                 printk(KERN_ERR "%s: Unaligned address\n",
2275                                         __func__);
2276                                 goto erase_exit;
2277                         }
2278                 }
2279
2280         }
2281
2282         instr->state = MTD_ERASE_DONE;
2283
2284 erase_exit:
2285
2286         ret = instr->state == MTD_ERASE_DONE ? 0 : -EIO;
2287
2288         /* Deselect and wake up anyone waiting on the device */
2289         onenand_release_device(mtd);
2290
2291         /* Do call back function */
2292         if (!ret)
2293                 mtd_erase_callback(instr);
2294
2295         return ret;
2296 }
2297
2298 /**
2299  * onenand_sync - [MTD Interface] sync
2300  * @param mtd           MTD device structure
2301  *
2302  * Sync is actually a wait for chip ready function
2303  */
2304 static void onenand_sync(struct mtd_info *mtd)
2305 {
2306         DEBUG(MTD_DEBUG_LEVEL3, "%s: called\n", __func__);
2307
2308         /* Grab the lock and see if the device is available */
2309         onenand_get_device(mtd, FL_SYNCING);
2310
2311         /* Release it and go back */
2312         onenand_release_device(mtd);
2313 }
2314
2315 /**
2316  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
2317  * @param mtd           MTD device structure
2318  * @param ofs           offset relative to mtd start
2319  *
2320  * Check whether the block is bad
2321  */
2322 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
2323 {
2324         int ret;
2325
2326         /* Check for invalid offset */
2327         if (ofs > mtd->size)
2328                 return -EINVAL;
2329
2330         onenand_get_device(mtd, FL_READING);
2331         ret = onenand_block_isbad_nolock(mtd, ofs, 0);
2332         onenand_release_device(mtd);
2333         return ret;
2334 }
2335
2336 /**
2337  * onenand_default_block_markbad - [DEFAULT] mark a block bad
2338  * @param mtd           MTD device structure
2339  * @param ofs           offset from device start
2340  *
2341  * This is the default implementation, which can be overridden by
2342  * a hardware specific driver.
2343  */
2344 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
2345 {
2346         struct onenand_chip *this = mtd->priv;
2347         struct bbm_info *bbm = this->bbm;
2348         u_char buf[2] = {0, 0};
2349         struct mtd_oob_ops ops = {
2350                 .mode = MTD_OOB_PLACE,
2351                 .ooblen = 2,
2352                 .oobbuf = buf,
2353                 .ooboffs = 0,
2354         };
2355         int block;
2356
2357         /* Get block number */
2358         block = onenand_block(this, ofs);
2359         if (bbm->bbt)
2360                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
2361
2362         /* We write two bytes, so we don't have to mess with 16-bit access */
2363         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
2364         /* FIXME : What to do when marking SLC block in partition
2365          *         with MLC erasesize? For now, it is not advisable to
2366          *         create partitions containing both SLC and MLC regions.
2367          */
2368         return onenand_write_oob_nolock(mtd, ofs, &ops);
2369 }
2370
2371 /**
2372  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
2373  * @param mtd           MTD device structure
2374  * @param ofs           offset relative to mtd start
2375  *
2376  * Mark the block as bad
2377  */
2378 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
2379 {
2380         struct onenand_chip *this = mtd->priv;
2381         int ret;
2382
2383         ret = onenand_block_isbad(mtd, ofs);
2384         if (ret) {
2385                 /* If it was bad already, return success and do nothing */
2386                 if (ret > 0)
2387                         return 0;
2388                 return ret;
2389         }
2390
2391         onenand_get_device(mtd, FL_WRITING);
2392         ret = this->block_markbad(mtd, ofs);
2393         onenand_release_device(mtd);
2394         return ret;
2395 }
2396
2397 /**
2398  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
2399  * @param mtd           MTD device structure
2400  * @param ofs           offset relative to mtd start
2401  * @param len           number of bytes to lock or unlock
2402  * @param cmd           lock or unlock command
2403  *
2404  * Lock or unlock one or more blocks
2405  */
2406 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
2407 {
2408         struct onenand_chip *this = mtd->priv;
2409         int start, end, block, value, status;
2410         int wp_status_mask;
2411
2412         start = onenand_block(this, ofs);
2413         end = onenand_block(this, ofs + len) - 1;
2414
2415         if (cmd == ONENAND_CMD_LOCK)
2416                 wp_status_mask = ONENAND_WP_LS;
2417         else
2418                 wp_status_mask = ONENAND_WP_US;
2419
2420         /* Continuous lock scheme */
2421         if (this->options & ONENAND_HAS_CONT_LOCK) {
2422                 /* Set start block address */
2423                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2424                 /* Set end block address */
2425                 this->write_word(end, this->base +  ONENAND_REG_END_BLOCK_ADDRESS);
2426                 /* Write lock command */
2427                 this->command(mtd, cmd, 0, 0);
2428
2429                 /* There's no return value */
2430                 this->wait(mtd, FL_LOCKING);
2431
2432                 /* Sanity check */
2433                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2434                     & ONENAND_CTRL_ONGO)
2435                         continue;
2436
2437                 /* Check lock status */
2438                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2439                 if (!(status & wp_status_mask))
2440                         printk(KERN_ERR "%s: wp status = 0x%x\n",
2441                                 __func__, status);
2442
2443                 return 0;
2444         }
2445
2446         /* Block lock scheme */
2447         for (block = start; block < end + 1; block++) {
2448                 /* Set block address */
2449                 value = onenand_block_address(this, block);
2450                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2451                 /* Select DataRAM for DDP */
2452                 value = onenand_bufferram_address(this, block);
2453                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2454                 /* Set start block address */
2455                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2456                 /* Write lock command */
2457                 this->command(mtd, cmd, 0, 0);
2458
2459                 /* There's no return value */
2460                 this->wait(mtd, FL_LOCKING);
2461
2462                 /* Sanity check */
2463                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2464                     & ONENAND_CTRL_ONGO)
2465                         continue;
2466
2467                 /* Check lock status */
2468                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2469                 if (!(status & wp_status_mask))
2470                         printk(KERN_ERR "%s: block = %d, wp status = 0x%x\n",
2471                                 __func__, block, status);
2472         }
2473
2474         return 0;
2475 }
2476
2477 /**
2478  * onenand_lock - [MTD Interface] Lock block(s)
2479  * @param mtd           MTD device structure
2480  * @param ofs           offset relative to mtd start
2481  * @param len           number of bytes to unlock
2482  *
2483  * Lock one or more blocks
2484  */
2485 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
2486 {
2487         int ret;
2488
2489         onenand_get_device(mtd, FL_LOCKING);
2490         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
2491         onenand_release_device(mtd);
2492         return ret;
2493 }
2494
2495 /**
2496  * onenand_unlock - [MTD Interface] Unlock block(s)
2497  * @param mtd           MTD device structure
2498  * @param ofs           offset relative to mtd start
2499  * @param len           number of bytes to unlock
2500  *
2501  * Unlock one or more blocks
2502  */
2503 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
2504 {
2505         int ret;
2506
2507         onenand_get_device(mtd, FL_LOCKING);
2508         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2509         onenand_release_device(mtd);
2510         return ret;
2511 }
2512
2513 /**
2514  * onenand_check_lock_status - [OneNAND Interface] Check lock status
2515  * @param this          onenand chip data structure
2516  *
2517  * Check lock status
2518  */
2519 static int onenand_check_lock_status(struct onenand_chip *this)
2520 {
2521         unsigned int value, block, status;
2522         unsigned int end;
2523
2524         end = this->chipsize >> this->erase_shift;
2525         for (block = 0; block < end; block++) {
2526                 /* Set block address */
2527                 value = onenand_block_address(this, block);
2528                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2529                 /* Select DataRAM for DDP */
2530                 value = onenand_bufferram_address(this, block);
2531                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2532                 /* Set start block address */
2533                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2534
2535                 /* Check lock status */
2536                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2537                 if (!(status & ONENAND_WP_US)) {
2538                         printk(KERN_ERR "%s: block = %d, wp status = 0x%x\n",
2539                                 __func__, block, status);
2540                         return 0;
2541                 }
2542         }
2543
2544         return 1;
2545 }
2546
2547 /**
2548  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
2549  * @param mtd           MTD device structure
2550  *
2551  * Unlock all blocks
2552  */
2553 static void onenand_unlock_all(struct mtd_info *mtd)
2554 {
2555         struct onenand_chip *this = mtd->priv;
2556         loff_t ofs = 0;
2557         loff_t len = mtd->size;
2558
2559         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
2560                 /* Set start block address */
2561                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2562                 /* Write unlock command */
2563                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
2564
2565                 /* There's no return value */
2566                 this->wait(mtd, FL_LOCKING);
2567
2568                 /* Sanity check */
2569                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2570                     & ONENAND_CTRL_ONGO)
2571                         continue;
2572
2573                 /* Don't check lock status */
2574                 if (this->options & ONENAND_SKIP_UNLOCK_CHECK)
2575                         return;
2576
2577                 /* Check lock status */
2578                 if (onenand_check_lock_status(this))
2579                         return;
2580
2581                 /* Workaround for all block unlock in DDP */
2582                 if (ONENAND_IS_DDP(this) && !FLEXONENAND(this)) {
2583                         /* All blocks on another chip */
2584                         ofs = this->chipsize >> 1;
2585                         len = this->chipsize >> 1;
2586                 }
2587         }
2588
2589         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2590 }
2591
2592 #ifdef CONFIG_MTD_ONENAND_OTP
2593
2594 /* Internal OTP operation */
2595 typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
2596                 size_t *retlen, u_char *buf);
2597
2598 /**
2599  * do_otp_read - [DEFAULT] Read OTP block area
2600  * @param mtd           MTD device structure
2601  * @param from          The offset to read
2602  * @param len           number of bytes to read
2603  * @param retlen        pointer to variable to store the number of readbytes
2604  * @param buf           the databuffer to put/get data
2605  *
2606  * Read OTP block area.
2607  */
2608 static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
2609                 size_t *retlen, u_char *buf)
2610 {
2611         struct onenand_chip *this = mtd->priv;
2612         struct mtd_oob_ops ops = {
2613                 .len    = len,
2614                 .ooblen = 0,
2615                 .datbuf = buf,
2616                 .oobbuf = NULL,
2617         };
2618         int ret;
2619
2620         /* Enter OTP access mode */
2621         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2622         this->wait(mtd, FL_OTPING);
2623
2624         ret = ONENAND_IS_MLC(this) ?
2625                 onenand_mlc_read_ops_nolock(mtd, from, &ops) :
2626                 onenand_read_ops_nolock(mtd, from, &ops);
2627
2628         /* Exit OTP access mode */
2629         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2630         this->wait(mtd, FL_RESETING);
2631
2632         return ret;
2633 }
2634
2635 /**
2636  * do_otp_write - [DEFAULT] Write OTP block area
2637  * @param mtd           MTD device structure
2638  * @param to            The offset to write
2639  * @param len           number of bytes to write
2640  * @param retlen        pointer to variable to store the number of write bytes
2641  * @param buf           the databuffer to put/get data
2642  *
2643  * Write OTP block area.
2644  */
2645 static int do_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
2646                 size_t *retlen, u_char *buf)
2647 {
2648         struct onenand_chip *this = mtd->priv;
2649         unsigned char *pbuf = buf;
2650         int ret;
2651         struct mtd_oob_ops ops;
2652
2653         /* Force buffer page aligned */
2654         if (len < mtd->writesize) {
2655                 memcpy(this->page_buf, buf, len);
2656                 memset(this->page_buf + len, 0xff, mtd->writesize - len);
2657                 pbuf = this->page_buf;
2658                 len = mtd->writesize;
2659         }
2660
2661         /* Enter OTP access mode */
2662         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2663         this->wait(mtd, FL_OTPING);
2664
2665         ops.len = len;
2666         ops.ooblen = 0;
2667         ops.datbuf = pbuf;
2668         ops.oobbuf = NULL;
2669         ret = onenand_write_ops_nolock(mtd, to, &ops);
2670         *retlen = ops.retlen;
2671
2672         /* Exit OTP access mode */
2673         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2674         this->wait(mtd, FL_RESETING);
2675
2676         return ret;
2677 }
2678
2679 /**
2680  * do_otp_lock - [DEFAULT] Lock OTP block area
2681  * @param mtd           MTD device structure
2682  * @param from          The offset to lock
2683  * @param len           number of bytes to lock
2684  * @param retlen        pointer to variable to store the number of lock bytes
2685  * @param buf           the databuffer to put/get data
2686  *
2687  * Lock OTP block area.
2688  */
2689 static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
2690                 size_t *retlen, u_char *buf)
2691 {
2692         struct onenand_chip *this = mtd->priv;
2693         struct mtd_oob_ops ops;
2694         int ret;
2695
2696         /* Enter OTP access mode */
2697         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2698         this->wait(mtd, FL_OTPING);
2699
2700         if (FLEXONENAND(this)) {
2701                 /*
2702                  * For Flex-OneNAND, we write lock mark to 1st word of sector 4 of
2703                  * main area of page 49.
2704                  */
2705                 ops.len = mtd->writesize;
2706                 ops.ooblen = 0;
2707                 ops.datbuf = buf;
2708                 ops.oobbuf = NULL;
2709                 ret = onenand_write_ops_nolock(mtd, mtd->writesize * 49, &ops);
2710                 *retlen = ops.retlen;
2711         } else {
2712                 ops.mode = MTD_OOB_PLACE;
2713                 ops.ooblen = len;
2714                 ops.oobbuf = buf;
2715                 ops.ooboffs = 0;
2716                 ret = onenand_write_oob_nolock(mtd, from, &ops);
2717                 *retlen = ops.oobretlen;
2718         }
2719
2720         /* Exit OTP access mode */
2721         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2722         this->wait(mtd, FL_RESETING);
2723
2724         return ret;
2725 }
2726
2727 /**
2728  * onenand_otp_walk - [DEFAULT] Handle OTP operation
2729  * @param mtd           MTD device structure
2730  * @param from          The offset to read/write
2731  * @param len           number of bytes to read/write
2732  * @param retlen        pointer to variable to store the number of read bytes
2733  * @param buf           the databuffer to put/get data
2734  * @param action        do given action
2735  * @param mode          specify user and factory
2736  *
2737  * Handle OTP operation.
2738  */
2739 static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
2740                         size_t *retlen, u_char *buf,
2741                         otp_op_t action, int mode)
2742 {
2743         struct onenand_chip *this = mtd->priv;
2744         int otp_pages;
2745         int density;
2746         int ret = 0;
2747
2748         *retlen = 0;
2749
2750         density = onenand_get_density(this->device_id);
2751         if (density < ONENAND_DEVICE_DENSITY_512Mb)
2752                 otp_pages = 20;
2753         else
2754                 otp_pages = 10;
2755
2756         if (mode == MTD_OTP_FACTORY) {
2757                 from += mtd->writesize * otp_pages;
2758                 otp_pages = 64 - otp_pages;
2759         }
2760
2761         /* Check User/Factory boundary */
2762         if (((mtd->writesize * otp_pages) - (from + len)) < 0)
2763                 return 0;
2764
2765         onenand_get_device(mtd, FL_OTPING);
2766         while (len > 0 && otp_pages > 0) {
2767                 if (!action) {  /* OTP Info functions */
2768                         struct otp_info *otpinfo;
2769
2770                         len -= sizeof(struct otp_info);
2771                         if (len <= 0) {
2772                                 ret = -ENOSPC;
2773                                 break;
2774                         }
2775
2776                         otpinfo = (struct otp_info *) buf;
2777                         otpinfo->start = from;
2778                         otpinfo->length = mtd->writesize;
2779                         otpinfo->locked = 0;
2780
2781                         from += mtd->writesize;
2782                         buf += sizeof(struct otp_info);
2783                         *retlen += sizeof(struct otp_info);
2784                 } else {
2785                         size_t tmp_retlen;
2786                         int size = len;
2787
2788                         ret = action(mtd, from, len, &tmp_retlen, buf);
2789
2790                         buf += size;
2791                         len -= size;
2792                         *retlen += size;
2793
2794                         if (ret)
2795                                 break;
2796                 }
2797                 otp_pages--;
2798         }
2799         onenand_release_device(mtd);
2800
2801         return ret;
2802 }
2803
2804 /**
2805  * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
2806  * @param mtd           MTD device structure
2807  * @param buf           the databuffer to put/get data
2808  * @param len           number of bytes to read
2809  *
2810  * Read factory OTP info.
2811  */
2812 static int onenand_get_fact_prot_info(struct mtd_info *mtd,
2813                         struct otp_info *buf, size_t len)
2814 {
2815         size_t retlen;
2816         int ret;
2817
2818         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);
2819
2820         return ret ? : retlen;
2821 }
2822
2823 /**
2824  * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
2825  * @param mtd           MTD device structure
2826  * @param from          The offset to read
2827  * @param len           number of bytes to read
2828  * @param retlen        pointer to variable to store the number of read bytes
2829  * @param buf           the databuffer to put/get data
2830  *
2831  * Read factory OTP area.
2832  */
2833 static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
2834                         size_t len, size_t *retlen, u_char *buf)
2835 {
2836         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
2837 }
2838
2839 /**
2840  * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
2841  * @param mtd           MTD device structure
2842  * @param buf           the databuffer to put/get data
2843  * @param len           number of bytes to read
2844  *
2845  * Read user OTP info.
2846  */
2847 static int onenand_get_user_prot_info(struct mtd_info *mtd,
2848                         struct otp_info *buf, size_t len)
2849 {
2850         size_t retlen;
2851         int ret;
2852
2853         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);
2854
2855         return ret ? : retlen;
2856 }
2857
2858 /**
2859  * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
2860  * @param mtd           MTD device structure
2861  * @param from          The offset to read
2862  * @param len           number of bytes to read
2863  * @param retlen        pointer to variable to store the number of read bytes
2864  * @param buf           the databuffer to put/get data
2865  *
2866  * Read user OTP area.
2867  */
2868 static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
2869                         size_t len, size_t *retlen, u_char *buf)
2870 {
2871         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
2872 }
2873
2874 /**
2875  * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
2876  * @param mtd           MTD device structure
2877  * @param from          The offset to write
2878  * @param len           number of bytes to write
2879  * @param retlen        pointer to variable to store the number of write bytes
2880  * @param buf           the databuffer to put/get data
2881  *
2882  * Write user OTP area.
2883  */
2884 static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
2885                         size_t len, size_t *retlen, u_char *buf)
2886 {
2887         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
2888 }
2889
2890 /**
2891  * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
2892  * @param mtd           MTD device structure
2893  * @param from          The offset to lock
2894  * @param len           number of bytes to unlock
2895  *
2896  * Write lock mark on spare area in page 0 in OTP block
2897  */
2898 static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
2899                         size_t len)
2900 {
2901         struct onenand_chip *this = mtd->priv;
2902         u_char *buf = FLEXONENAND(this) ? this->page_buf : this->oob_buf;
2903         size_t retlen;
2904         int ret;
2905
2906         memset(buf, 0xff, FLEXONENAND(this) ? this->writesize
2907                                                  : mtd->oobsize);
2908         /*
2909          * Note: OTP lock operation
2910          *       OTP block : 0xXXFC
2911          *       1st block : 0xXXF3 (If chip support)
2912          *       Both      : 0xXXF0 (If chip support)
2913          */
2914         if (FLEXONENAND(this))
2915                 buf[FLEXONENAND_OTP_LOCK_OFFSET] = 0xFC;
2916         else
2917                 buf[ONENAND_OTP_LOCK_OFFSET] = 0xFC;
2918
2919         /*
2920          * Write lock mark to 8th word of sector0 of page0 of the spare0.
2921          * We write 16 bytes spare area instead of 2 bytes.
2922          * For Flex-OneNAND, we write lock mark to 1st word of sector 4 of
2923          * main area of page 49.
2924          */
2925
2926         from = 0;
2927         len = FLEXONENAND(this) ? mtd->writesize : 16;
2928
2929         ret = onenand_otp_walk(mtd, from, len, &retlen, buf, do_otp_lock, MTD_OTP_USER);
2930
2931         return ret ? : retlen;
2932 }
2933 #endif  /* CONFIG_MTD_ONENAND_OTP */
2934
2935 /**
2936  * onenand_check_features - Check and set OneNAND features
2937  * @param mtd           MTD data structure
2938  *
2939  * Check and set OneNAND features
2940  * - lock scheme
2941  * - two plane
2942  */
2943 static void onenand_check_features(struct mtd_info *mtd)
2944 {
2945         struct onenand_chip *this = mtd->priv;
2946         unsigned int density, process;
2947
2948         /* Lock scheme depends on density and process */
2949         density = onenand_get_density(this->device_id);
2950         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
2951
2952         /* Lock scheme */
2953         switch (density) {
2954         case ONENAND_DEVICE_DENSITY_4Gb:
2955                 this->options |= ONENAND_HAS_2PLANE;
2956
2957         case ONENAND_DEVICE_DENSITY_2Gb:
2958                 /* 2Gb DDP does not have 2 plane */
2959                 if (!ONENAND_IS_DDP(this))
2960                         this->options |= ONENAND_HAS_2PLANE;
2961                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2962
2963         case ONENAND_DEVICE_DENSITY_1Gb:
2964                 /* A-Die has all block unlock */
2965                 if (process)
2966                         this->options |= ONENAND_HAS_UNLOCK_ALL;
2967                 break;
2968
2969         default:
2970                 /* Some OneNAND has continuous lock scheme */
2971                 if (!process)
2972                         this->options |= ONENAND_HAS_CONT_LOCK;
2973                 break;
2974         }
2975
2976         if (ONENAND_IS_MLC(this))
2977                 this->options &= ~ONENAND_HAS_2PLANE;
2978
2979         if (FLEXONENAND(this)) {
2980                 this->options &= ~ONENAND_HAS_CONT_LOCK;
2981                 this->options |= ONENAND_HAS_UNLOCK_ALL;
2982         }
2983
2984         if (this->options & ONENAND_HAS_CONT_LOCK)
2985                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
2986         if (this->options & ONENAND_HAS_UNLOCK_ALL)
2987                 printk(KERN_DEBUG "Chip support all block unlock\n");
2988         if (this->options & ONENAND_HAS_2PLANE)
2989                 printk(KERN_DEBUG "Chip has 2 plane\n");
2990 }
2991
2992 /**
2993  * onenand_print_device_info - Print device & version ID
2994  * @param device        device ID
2995  * @param version       version ID
2996  *
2997  * Print device & version ID
2998  */
2999 static void onenand_print_device_info(int device, int version)
3000 {
3001         int vcc, demuxed, ddp, density, flexonenand;
3002
3003         vcc = device & ONENAND_DEVICE_VCC_MASK;
3004         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
3005         ddp = device & ONENAND_DEVICE_IS_DDP;
3006         density = onenand_get_density(device);
3007         flexonenand = device & DEVICE_IS_FLEXONENAND;
3008         printk(KERN_INFO "%s%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
3009                 demuxed ? "" : "Muxed ",
3010                 flexonenand ? "Flex-" : "",
3011                 ddp ? "(DDP)" : "",
3012                 (16 << density),
3013                 vcc ? "2.65/3.3" : "1.8",
3014                 device);
3015         printk(KERN_INFO "OneNAND version = 0x%04x\n", version);
3016 }
3017
3018 static const struct onenand_manufacturers onenand_manuf_ids[] = {
3019         {ONENAND_MFR_SAMSUNG, "Samsung"},
3020         {ONENAND_MFR_NUMONYX, "Numonyx"},
3021 };
3022
3023 /**
3024  * onenand_check_maf - Check manufacturer ID
3025  * @param manuf         manufacturer ID
3026  *
3027  * Check manufacturer ID
3028  */
3029 static int onenand_check_maf(int manuf)
3030 {
3031         int size = ARRAY_SIZE(onenand_manuf_ids);
3032         char *name;
3033         int i;
3034
3035         for (i = 0; i < size; i++)
3036                 if (manuf == onenand_manuf_ids[i].id)
3037                         break;
3038
3039         if (i < size)
3040                 name = onenand_manuf_ids[i].name;
3041         else
3042                 name = "Unknown";
3043
3044         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
3045
3046         return (i == size);
3047 }
3048
3049 /**
3050 * flexonenand_get_boundary      - Reads the SLC boundary
3051 * @param onenand_info           - onenand info structure
3052 **/
3053 static int flexonenand_get_boundary(struct mtd_info *mtd)
3054 {
3055         struct onenand_chip *this = mtd->priv;
3056         unsigned die, bdry;
3057         int ret, syscfg, locked;
3058
3059         /* Disable ECC */
3060         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
3061         this->write_word((syscfg | 0x0100), this->base + ONENAND_REG_SYS_CFG1);
3062
3063         for (die = 0; die < this->dies; die++) {
3064                 this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
3065                 this->wait(mtd, FL_SYNCING);
3066
3067                 this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
3068                 ret = this->wait(mtd, FL_READING);
3069
3070                 bdry = this->read_word(this->base + ONENAND_DATARAM);
3071                 if ((bdry >> FLEXONENAND_PI_UNLOCK_SHIFT) == 3)
3072                         locked = 0;
3073                 else
3074                         locked = 1;
3075                 this->boundary[die] = bdry & FLEXONENAND_PI_MASK;
3076
3077                 this->command(mtd, ONENAND_CMD_RESET, 0, 0);
3078                 ret = this->wait(mtd, FL_RESETING);
3079
3080                 printk(KERN_INFO "Die %d boundary: %d%s\n", die,
3081                        this->boundary[die], locked ? "(Locked)" : "(Unlocked)");
3082         }
3083
3084         /* Enable ECC */
3085         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
3086         return 0;
3087 }
3088
3089 /**
3090  * flexonenand_get_size - Fill up fields in onenand_chip and mtd_info
3091  *                        boundary[], diesize[], mtd->size, mtd->erasesize
3092  * @param mtd           - MTD device structure
3093  */
3094 static void flexonenand_get_size(struct mtd_info *mtd)
3095 {
3096         struct onenand_chip *this = mtd->priv;
3097         int die, i, eraseshift, density;
3098         int blksperdie, maxbdry;
3099         loff_t ofs;
3100
3101         density = onenand_get_density(this->device_id);
3102         blksperdie = ((loff_t)(16 << density) << 20) >> (this->erase_shift);
3103         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
3104         maxbdry = blksperdie - 1;
3105         eraseshift = this->erase_shift - 1;
3106
3107         mtd->numeraseregions = this->dies << 1;
3108
3109         /* This fills up the device boundary */
3110         flexonenand_get_boundary(mtd);
3111         die = ofs = 0;
3112         i = -1;
3113         for (; die < this->dies; die++) {
3114                 if (!die || this->boundary[die-1] != maxbdry) {
3115                         i++;
3116                         mtd->eraseregions[i].offset = ofs;
3117                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
3118                         mtd->eraseregions[i].numblocks =
3119                                                         this->boundary[die] + 1;
3120                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
3121                         eraseshift++;
3122                 } else {
3123                         mtd->numeraseregions -= 1;
3124                         mtd->eraseregions[i].numblocks +=
3125                                                         this->boundary[die] + 1;
3126                         ofs += (this->boundary[die] + 1) << (eraseshift - 1);
3127                 }
3128                 if (this->boundary[die] != maxbdry) {
3129                         i++;
3130                         mtd->eraseregions[i].offset = ofs;
3131                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
3132                         mtd->eraseregions[i].numblocks = maxbdry ^
3133                                                          this->boundary[die];
3134                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
3135                         eraseshift--;
3136                 } else
3137                         mtd->numeraseregions -= 1;
3138         }
3139
3140         /* Expose MLC erase size except when all blocks are SLC */
3141         mtd->erasesize = 1 << this->erase_shift;
3142         if (mtd->numeraseregions == 1)
3143                 mtd->erasesize >>= 1;
3144
3145         printk(KERN_INFO "Device has %d eraseregions\n", mtd->numeraseregions);
3146         for (i = 0; i < mtd->numeraseregions; i++)
3147                 printk(KERN_INFO "[offset: 0x%08x, erasesize: 0x%05x,"
3148                         " numblocks: %04u]\n",
3149                         (unsigned int) mtd->eraseregions[i].offset,
3150                         mtd->eraseregions[i].erasesize,
3151                         mtd->eraseregions[i].numblocks);
3152
3153         for (die = 0, mtd->size = 0; die < this->dies; die++) {
3154                 this->diesize[die] = (loff_t)blksperdie << this->erase_shift;
3155                 this->diesize[die] -= (loff_t)(this->boundary[die] + 1)
3156                                                  << (this->erase_shift - 1);
3157                 mtd->size += this->diesize[die];
3158         }
3159 }
3160
3161 /**
3162  * flexonenand_check_blocks_erased - Check if blocks are erased
3163  * @param mtd_info      - mtd info structure
3164  * @param start         - first erase block to check
3165  * @param end           - last erase block to check
3166  *
3167  * Converting an unerased block from MLC to SLC
3168  * causes byte values to change. Since both data and its ECC
3169  * have changed, reads on the block give uncorrectable error.
3170  * This might lead to the block being detected as bad.
3171  *
3172  * Avoid this by ensuring that the block to be converted is
3173  * erased.
3174  */
3175 static int flexonenand_check_blocks_erased(struct mtd_info *mtd, int start, int end)
3176 {
3177         struct onenand_chip *this = mtd->priv;
3178         int i, ret;
3179         int block;
3180         struct mtd_oob_ops ops = {
3181                 .mode = MTD_OOB_PLACE,
3182                 .ooboffs = 0,
3183                 .ooblen = mtd->oobsize,
3184                 .datbuf = NULL,
3185                 .oobbuf = this->oob_buf,
3186         };
3187         loff_t addr;
3188
3189         printk(KERN_DEBUG "Check blocks from %d to %d\n", start, end);
3190
3191         for (block = start; block <= end; block++) {
3192                 addr = flexonenand_addr(this, block);
3193                 if (onenand_block_isbad_nolock(mtd, addr, 0))
3194                         continue;
3195
3196                 /*
3197                  * Since main area write results in ECC write to spare,
3198                  * it is sufficient to check only ECC bytes for change.
3199                  */
3200                 ret = onenand_read_oob_nolock(mtd, addr, &ops);
3201                 if (ret)
3202                         return ret;
3203
3204                 for (i = 0; i < mtd->oobsize; i++)
3205                         if (this->oob_buf[i] != 0xff)
3206                                 break;
3207
3208                 if (i != mtd->oobsize) {
3209                         printk(KERN_WARNING "%s: Block %d not erased.\n",
3210                                 __func__, block);
3211                         return 1;
3212                 }
3213         }
3214
3215         return 0;
3216 }
3217
3218 /**
3219  * flexonenand_set_boundary     - Writes the SLC boundary
3220  * @param mtd                   - mtd info structure
3221  */
3222 int flexonenand_set_boundary(struct mtd_info *mtd, int die,
3223                                     int boundary, int lock)
3224 {
3225         struct onenand_chip *this = mtd->priv;
3226         int ret, density, blksperdie, old, new, thisboundary;
3227         loff_t addr;
3228
3229         /* Change only once for SDP Flex-OneNAND */
3230         if (die && (!ONENAND_IS_DDP(this)))
3231                 return 0;
3232
3233         /* boundary value of -1 indicates no required change */
3234         if (boundary < 0 || boundary == this->boundary[die])
3235                 return 0;
3236
3237         density = onenand_get_density(this->device_id);
3238         blksperdie = ((16 << density) << 20) >> this->erase_shift;
3239         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
3240
3241         if (boundary >= blksperdie) {
3242                 printk(KERN_ERR "%s: Invalid boundary value. "
3243                                 "Boundary not changed.\n", __func__);
3244                 return -EINVAL;
3245         }
3246
3247         /* Check if converting blocks are erased */
3248         old = this->boundary[die] + (die * this->density_mask);
3249         new = boundary + (die * this->density_mask);
3250         ret = flexonenand_check_blocks_erased(mtd, min(old, new) + 1, max(old, new));
3251         if (ret) {
3252                 printk(KERN_ERR "%s: Please erase blocks "
3253                                 "before boundary change\n", __func__);
3254                 return ret;
3255         }
3256
3257         this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
3258         this->wait(mtd, FL_SYNCING);
3259
3260         /* Check is boundary is locked */
3261         this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
3262         ret = this->wait(mtd, FL_READING);
3263
3264         thisboundary = this->read_word(this->base + ONENAND_DATARAM);
3265         if ((thisboundary >> FLEXONENAND_PI_UNLOCK_SHIFT) != 3) {
3266                 printk(KERN_ERR "%s: boundary locked\n", __func__);
3267                 ret = 1;
3268                 goto out;
3269         }
3270
3271         printk(KERN_INFO "Changing die %d boundary: %d%s\n",
3272                         die, boundary, lock ? "(Locked)" : "(Unlocked)");
3273
3274         addr = die ? this->diesize[0] : 0;
3275
3276         boundary &= FLEXONENAND_PI_MASK;
3277         boundary |= lock ? 0 : (3 << FLEXONENAND_PI_UNLOCK_SHIFT);
3278
3279         this->command(mtd, ONENAND_CMD_ERASE, addr, 0);
3280         ret = this->wait(mtd, FL_ERASING);
3281         if (ret) {
3282                 printk(KERN_ERR "%s: flexonenand_set_boundary: "
3283                                 "Failed PI erase for Die %d\n", __func__, die);
3284                 goto out;
3285         }
3286
3287         this->write_word(boundary, this->base + ONENAND_DATARAM);
3288         this->command(mtd, ONENAND_CMD_PROG, addr, 0);
3289         ret = this->wait(mtd, FL_WRITING);
3290         if (ret) {
3291                 printk(KERN_ERR "%s: Failed PI write for Die %d\n",
3292                         __func__, die);
3293                 goto out;
3294         }
3295
3296         this->command(mtd, FLEXONENAND_CMD_PI_UPDATE, die, 0);
3297         ret = this->wait(mtd, FL_WRITING);
3298 out:
3299         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_REG_COMMAND);
3300         this->wait(mtd, FL_RESETING);
3301         if (!ret)
3302                 /* Recalculate device size on boundary change*/
3303                 flexonenand_get_size(mtd);
3304
3305         return ret;
3306 }
3307
3308 /**
3309  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
3310  * @param mtd           MTD device structure
3311  *
3312  * OneNAND detection method:
3313  *   Compare the values from command with ones from register
3314  */
3315 static int onenand_probe(struct mtd_info *mtd)
3316 {
3317         struct onenand_chip *this = mtd->priv;
3318         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
3319         int density;
3320         int syscfg;
3321
3322         /* Save system configuration 1 */
3323         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
3324         /* Clear Sync. Burst Read mode to read BootRAM */
3325         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE), this->base + ONENAND_REG_SYS_CFG1);
3326
3327         /* Send the command for reading device ID from BootRAM */
3328         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
3329
3330         /* Read manufacturer and device IDs from BootRAM */
3331         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
3332         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
3333
3334         /* Reset OneNAND to read default register values */
3335         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
3336         /* Wait reset */
3337         this->wait(mtd, FL_RESETING);
3338
3339         /* Restore system configuration 1 */
3340         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
3341
3342         /* Check manufacturer ID */
3343         if (onenand_check_maf(bram_maf_id))
3344                 return -ENXIO;
3345
3346         /* Read manufacturer and device IDs from Register */
3347         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
3348         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
3349         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
3350         this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
3351
3352         /* Check OneNAND device */
3353         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
3354                 return -ENXIO;
3355
3356         /* Flash device information */
3357         onenand_print_device_info(dev_id, ver_id);
3358         this->device_id = dev_id;
3359         this->version_id = ver_id;
3360
3361         density = onenand_get_density(dev_id);
3362         if (FLEXONENAND(this)) {
3363                 this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
3364                 /* Maximum possible erase regions */
3365                 mtd->numeraseregions = this->dies << 1;
3366                 mtd->eraseregions = kzalloc(sizeof(struct mtd_erase_region_info)
3367                                         * (this->dies << 1), GFP_KERNEL);
3368                 if (!mtd->eraseregions)
3369                         return -ENOMEM;
3370         }
3371
3372         /*
3373          * For Flex-OneNAND, chipsize represents maximum possible device size.
3374          * mtd->size represents the actual device size.
3375          */
3376         this->chipsize = (16 << density) << 20;
3377
3378         /* OneNAND page size & block size */
3379         /* The data buffer size is equal to page size */
3380         mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
3381         /* We use the full BufferRAM */
3382         if (ONENAND_IS_MLC(this))
3383                 mtd->writesize <<= 1;
3384
3385         mtd->oobsize = mtd->writesize >> 5;
3386         /* Pages per a block are always 64 in OneNAND */
3387         mtd->erasesize = mtd->writesize << 6;
3388         /*
3389          * Flex-OneNAND SLC area has 64 pages per block.
3390          * Flex-OneNAND MLC area has 128 pages per block.
3391          * Expose MLC erase size to find erase_shift and page_mask.
3392          */
3393         if (FLEXONENAND(this))
3394                 mtd->erasesize <<= 1;
3395
3396         this->erase_shift = ffs(mtd->erasesize) - 1;
3397         this->page_shift = ffs(mtd->writesize) - 1;
3398         this->page_mask = (1 << (this->erase_shift - this->page_shift)) - 1;
3399         /* Set density mask. it is used for DDP */
3400         if (ONENAND_IS_DDP(this))
3401                 this->density_mask = this->chipsize >> (this->erase_shift + 1);
3402         /* It's real page size */
3403         this->writesize = mtd->writesize;
3404
3405         /* REVISIT: Multichip handling */
3406
3407         if (FLEXONENAND(this))
3408                 flexonenand_get_size(mtd);
3409         else
3410                 mtd->size = this->chipsize;
3411
3412         /* Check OneNAND features */
3413         onenand_check_features(mtd);
3414
3415         /*
3416          * We emulate the 4KiB page and 256KiB erase block size
3417          * But oobsize is still 64 bytes.
3418          * It is only valid if you turn on 2X program support,
3419          * Otherwise it will be ignored by compiler.
3420          */
3421         if (ONENAND_IS_2PLANE(this)) {
3422                 mtd->writesize <<= 1;
3423                 mtd->erasesize <<= 1;
3424         }
3425
3426         return 0;
3427 }
3428
3429 /**
3430  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
3431  * @param mtd           MTD device structure
3432  */
3433 static int onenand_suspend(struct mtd_info *mtd)
3434 {
3435         return onenand_get_device(mtd, FL_PM_SUSPENDED);
3436 }
3437
3438 /**
3439  * onenand_resume - [MTD Interface] Resume the OneNAND flash
3440  * @param mtd           MTD device structure
3441  */
3442 static void onenand_resume(struct mtd_info *mtd)
3443 {
3444         struct onenand_chip *this = mtd->priv;
3445
3446         if (this->state == FL_PM_SUSPENDED)
3447                 onenand_release_device(mtd);
3448         else
3449                 printk(KERN_ERR "%s: resume() called for the chip which is not "
3450                                 "in suspended state\n", __func__);
3451 }
3452
3453 /**
3454  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
3455  * @param mtd           MTD device structure
3456  * @param maxchips      Number of chips to scan for
3457  *
3458  * This fills out all the not initialized function pointers
3459  * with the defaults.
3460  * The flash ID is read and the mtd/chip structures are
3461  * filled with the appropriate values.
3462  */
3463 int onenand_scan(struct mtd_info *mtd, int maxchips)
3464 {
3465         int i, ret;
3466         struct onenand_chip *this = mtd->priv;
3467
3468         if (!this->read_word)
3469                 this->read_word = onenand_readw;
3470         if (!this->write_word)
3471                 this->write_word = onenand_writew;
3472
3473         if (!this->command)
3474                 this->command = onenand_command;
3475         if (!this->wait)
3476                 onenand_setup_wait(mtd);
3477         if (!this->bbt_wait)
3478                 this->bbt_wait = onenand_bbt_wait;
3479         if (!this->unlock_all)
3480                 this->unlock_all = onenand_unlock_all;
3481
3482         if (!this->read_bufferram)
3483                 this->read_bufferram = onenand_read_bufferram;
3484         if (!this->write_bufferram)
3485                 this->write_bufferram = onenand_write_bufferram;
3486
3487         if (!this->block_markbad)
3488                 this->block_markbad = onenand_default_block_markbad;
3489         if (!this->scan_bbt)
3490                 this->scan_bbt = onenand_default_bbt;
3491
3492         if (onenand_probe(mtd))
3493                 return -ENXIO;
3494
3495         /* Set Sync. Burst Read after probing */
3496         if (this->mmcontrol) {
3497                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
3498                 this->read_bufferram = onenand_sync_read_bufferram;
3499         }
3500
3501         /* Allocate buffers, if necessary */
3502         if (!this->page_buf) {
3503                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
3504                 if (!this->page_buf) {
3505                         printk(KERN_ERR "%s: Can't allocate page_buf\n",
3506                                 __func__);
3507                         return -ENOMEM;
3508                 }
3509                 this->options |= ONENAND_PAGEBUF_ALLOC;
3510         }
3511         if (!this->oob_buf) {
3512                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
3513                 if (!this->oob_buf) {
3514                         printk(KERN_ERR "%s: Can't allocate oob_buf\n",
3515                                 __func__);
3516                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
3517                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
3518                                 kfree(this->page_buf);
3519                         }
3520                         return -ENOMEM;
3521                 }
3522                 this->options |= ONENAND_OOBBUF_ALLOC;
3523         }
3524
3525         this->state = FL_READY;
3526         init_waitqueue_head(&this->wq);
3527         spin_lock_init(&this->chip_lock);
3528
3529         /*
3530          * Allow subpage writes up to oobsize.
3531          */
3532         switch (mtd->oobsize) {
3533         case 128:
3534                 this->ecclayout = &onenand_oob_128;
3535                 mtd->subpage_sft = 0;
3536                 break;
3537         case 64:
3538                 this->ecclayout = &onenand_oob_64;
3539                 mtd->subpage_sft = 2;
3540                 break;
3541
3542         case 32:
3543                 this->ecclayout = &onenand_oob_32;
3544                 mtd->subpage_sft = 1;
3545                 break;
3546
3547         default:
3548                 printk(KERN_WARNING "%s: No OOB scheme defined for oobsize %d\n",
3549                         __func__, mtd->oobsize);
3550                 mtd->subpage_sft = 0;
3551                 /* To prevent kernel oops */
3552                 this->ecclayout = &onenand_oob_32;
3553                 break;
3554         }
3555
3556         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
3557
3558         /*
3559          * The number of bytes available for a client to place data into
3560          * the out of band area
3561          */
3562         this->ecclayout->oobavail = 0;
3563         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
3564             this->ecclayout->oobfree[i].length; i++)
3565                 this->ecclayout->oobavail +=
3566                         this->ecclayout->oobfree[i].length;
3567         mtd->oobavail = this->ecclayout->oobavail;
3568
3569         mtd->ecclayout = this->ecclayout;
3570
3571         /* Fill in remaining MTD driver data */
3572         mtd->type = MTD_NANDFLASH;
3573         mtd->flags = MTD_CAP_NANDFLASH;
3574         mtd->erase = onenand_erase;
3575         mtd->point = NULL;
3576         mtd->unpoint = NULL;
3577         mtd->read = onenand_read;
3578         mtd->write = onenand_write;
3579         mtd->read_oob = onenand_read_oob;
3580         mtd->write_oob = onenand_write_oob;
3581         mtd->panic_write = onenand_panic_write;
3582 #ifdef CONFIG_MTD_ONENAND_OTP
3583         mtd->get_fact_prot_info = onenand_get_fact_prot_info;
3584         mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;
3585         mtd->get_user_prot_info = onenand_get_user_prot_info;
3586         mtd->read_user_prot_reg = onenand_read_user_prot_reg;
3587         mtd->write_user_prot_reg = onenand_write_user_prot_reg;
3588         mtd->lock_user_prot_reg = onenand_lock_user_prot_reg;
3589 #endif
3590         mtd->sync = onenand_sync;
3591         mtd->lock = onenand_lock;
3592         mtd->unlock = onenand_unlock;
3593         mtd->suspend = onenand_suspend;
3594         mtd->resume = onenand_resume;
3595         mtd->block_isbad = onenand_block_isbad;
3596         mtd->block_markbad = onenand_block_markbad;
3597         mtd->owner = THIS_MODULE;
3598
3599         /* Unlock whole block */
3600         this->unlock_all(mtd);
3601
3602         ret = this->scan_bbt(mtd);
3603         if ((!FLEXONENAND(this)) || ret)
3604                 return ret;
3605
3606         /* Change Flex-OneNAND boundaries if required */
3607         for (i = 0; i < MAX_DIES; i++)
3608                 flexonenand_set_boundary(mtd, i, flex_bdry[2 * i],
3609                                                  flex_bdry[(2 * i) + 1]);
3610
3611         return 0;
3612 }
3613
3614 /**
3615  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
3616  * @param mtd           MTD device structure
3617  */
3618 void onenand_release(struct mtd_info *mtd)
3619 {
3620         struct onenand_chip *this = mtd->priv;
3621
3622 #ifdef CONFIG_MTD_PARTITIONS
3623         /* Deregister partitions */
3624         del_mtd_partitions (mtd);
3625 #endif
3626         /* Deregister the device */
3627         del_mtd_device (mtd);
3628
3629         /* Free bad block table memory, if allocated */
3630         if (this->bbm) {
3631                 struct bbm_info *bbm = this->bbm;
3632                 kfree(bbm->bbt);
3633                 kfree(this->bbm);
3634         }
3635         /* Buffers allocated by onenand_scan */
3636         if (this->options & ONENAND_PAGEBUF_ALLOC)
3637                 kfree(this->page_buf);
3638         if (this->options & ONENAND_OOBBUF_ALLOC)
3639                 kfree(this->oob_buf);
3640         kfree(mtd->eraseregions);
3641 }
3642
3643 EXPORT_SYMBOL_GPL(onenand_scan);
3644 EXPORT_SYMBOL_GPL(onenand_release);
3645
3646 MODULE_LICENSE("GPL");
3647 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
3648 MODULE_DESCRIPTION("Generic OneNAND flash driver code");