drivers/mtd/onenand/onenand_base.c

   1 /*
   2  *  linux/drivers/mtd/onenand/onenand_base.c
   3  *
   4  *  Copyright © 2005-2009 Samsung Electronics
   5  *  Copyright © 2007 Nokia Corporation
   6  *
   7  *  Kyungmin Park <kyungmin.park@samsung.com>
   8  *
   9  *  Credits:
  10  *      Adrian Hunter <ext-adrian.hunter@nokia.com>:
  11  *      auto-placement support, read-while load support, various fixes
  12  *
  13  *      Vishak G <vishak.g at samsung.com>, Rohit Hagargundgi <h.rohit at samsung.com>
  14  *      Flex-OneNAND support
  15  *      Amul Kumar Saha <amul.saha at samsung.com>
  16  *      OTP support
  17  *
  18  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License version 2 as
  20  * published by the Free Software Foundation.
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26 #include <linux/slab.h>
  27 #include <linux/init.h>
  28 #include <linux/sched.h>
  29 #include <linux/delay.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/mtd/mtd.h>
  33 #include <linux/mtd/onenand.h>
  34 #include <linux/mtd/partitions.h>
  35
  36 #include <asm/io.h>
  37
  38 /*
  39  * Multiblock erase if number of blocks to erase is 2 or more.
  40  * Maximum number of blocks for simultaneous erase is 64.
  41  */
  42 #define MB_ERASE_MIN_BLK_COUNT 2
  43 #define MB_ERASE_MAX_BLK_COUNT 64
  44
  45 /* Default Flex-OneNAND boundary and lock respectively */
  46 static int flex_bdry[MAX_DIES * 2] = { -1, 0, -1, 0 };
  47
  48 module_param_array(flex_bdry, int, NULL, 0400);
  49 MODULE_PARM_DESC(flex_bdry,     "SLC Boundary information for Flex-OneNAND"
  50                                 "Syntax:flex_bdry=DIE_BDRY,LOCK,..."
  51                                 "DIE_BDRY: SLC boundary of the die"
  52                                 "LOCK: Locking information for SLC boundary"
  53                                 "    : 0->Set boundary in unlocked status"
  54                                 "    : 1->Set boundary in locked status");
  55
  56 /* Default OneNAND/Flex-OneNAND OTP options*/
  57 static int otp;
  58
  59 module_param(otp, int, 0400);
  60 MODULE_PARM_DESC(otp,   "Corresponding behaviour of OneNAND in OTP"
  61                         "Syntax : otp=LOCK_TYPE"
  62                         "LOCK_TYPE : Keys issued, for specific OTP Lock type"
  63                         "          : 0 -> Default (No Blocks Locked)"
  64                         "          : 1 -> OTP Block lock"
  65                         "          : 2 -> 1st Block lock"
  66                         "          : 3 -> BOTH OTP Block and 1st Block lock");
  67
  68 /**
  69  *  onenand_oob_128 - oob info for Flex-Onenand with 4KB page
  70  *  For now, we expose only 64 out of 80 ecc bytes
  71  */
  72 static struct nand_ecclayout onenand_oob_128 = {
  73         .eccbytes       = 64,
  74         .eccpos         = {
  75                 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
  76                 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
  77                 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
  78                 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
  79                 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
  80                 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
  81                 102, 103, 104, 105
  82                 },
  83         .oobfree        = {
  84                 {2, 4}, {18, 4}, {34, 4}, {50, 4},
  85                 {66, 4}, {82, 4}, {98, 4}, {114, 4}
  86         }
  87 };
  88
  89 /**
  90  * onenand_oob_64 - oob info for large (2KB) page
  91  */
  92 static struct nand_ecclayout onenand_oob_64 = {
  93         .eccbytes       = 20,
  94         .eccpos         = {
  95                 8, 9, 10, 11, 12,
  96                 24, 25, 26, 27, 28,
  97                 40, 41, 42, 43, 44,
  98                 56, 57, 58, 59, 60,
  99                 },
 100         .oobfree        = {
 101                 {2, 3}, {14, 2}, {18, 3}, {30, 2},
 102                 {34, 3}, {46, 2}, {50, 3}, {62, 2}
 103         }
 104 };
 105
 106 /**
 107  * onenand_oob_32 - oob info for middle (1KB) page
 108  */
 109 static struct nand_ecclayout onenand_oob_32 = {
 110         .eccbytes       = 10,
 111         .eccpos         = {
 112                 8, 9, 10, 11, 12,
 113                 24, 25, 26, 27, 28,
 114                 },
 115         .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
 116 };
 117
 118 static const unsigned char ffchars[] = {
 119         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 120         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 16 */
 121         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 122         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 32 */
 123         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 124         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 48 */
 125         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 126         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 64 */
 127         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 128         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 80 */
 129         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 130         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 96 */
 131         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 132         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 112 */
 133         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
 134         0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, /* 128 */
 135 };
 136
 137 /**
 138  * onenand_readw - [OneNAND Interface] Read OneNAND register
 139  * @param addr          address to read
 140  *
 141  * Read OneNAND register
 142  */
 143 static unsigned short onenand_readw(void __iomem *addr)
 144 {
 145         return readw(addr);
 146 }
 147
 148 /**
 149  * onenand_writew - [OneNAND Interface] Write OneNAND register with value
 150  * @param value         value to write
 151  * @param addr          address to write
 152  *
 153  * Write OneNAND register with value
 154  */
 155 static void onenand_writew(unsigned short value, void __iomem *addr)
 156 {
 157         writew(value, addr);
 158 }
 159
 160 /**
 161  * onenand_block_address - [DEFAULT] Get block address
 162  * @param this          onenand chip data structure
 163  * @param block         the block
 164  * @return              translated block address if DDP, otherwise same
 165  *
 166  * Setup Start Address 1 Register (F100h)
 167  */
 168 static int onenand_block_address(struct onenand_chip *this, int block)
 169 {
 170         /* Device Flash Core select, NAND Flash Block Address */
 171         if (block & this->density_mask)
 172                 return ONENAND_DDP_CHIP1 | (block ^ this->density_mask);
 173
 174         return block;
 175 }
 176
 177 /**
 178  * onenand_bufferram_address - [DEFAULT] Get bufferram address
 179  * @param this          onenand chip data structure
 180  * @param block         the block
 181  * @return              set DBS value if DDP, otherwise 0
 182  *
 183  * Setup Start Address 2 Register (F101h) for DDP
 184  */
 185 static int onenand_bufferram_address(struct onenand_chip *this, int block)
 186 {
 187         /* Device BufferRAM Select */
 188         if (block & this->density_mask)
 189                 return ONENAND_DDP_CHIP1;
 190
 191         return ONENAND_DDP_CHIP0;
 192 }
 193
 194 /**
 195  * onenand_page_address - [DEFAULT] Get page address
 196  * @param page          the page address
 197  * @param sector        the sector address
 198  * @return              combined page and sector address
 199  *
 200  * Setup Start Address 8 Register (F107h)
 201  */
 202 static int onenand_page_address(int page, int sector)
 203 {
 204         /* Flash Page Address, Flash Sector Address */
 205         int fpa, fsa;
 206
 207         fpa = page & ONENAND_FPA_MASK;
 208         fsa = sector & ONENAND_FSA_MASK;
 209
 210         return ((fpa << ONENAND_FPA_SHIFT) | fsa);
 211 }
 212
 213 /**
 214  * onenand_buffer_address - [DEFAULT] Get buffer address
 215  * @param dataram1      DataRAM index
 216  * @param sectors       the sector address
 217  * @param count         the number of sectors
 218  * @return              the start buffer value
 219  *
 220  * Setup Start Buffer Register (F200h)
 221  */
 222 static int onenand_buffer_address(int dataram1, int sectors, int count)
 223 {
 224         int bsa, bsc;
 225
 226         /* BufferRAM Sector Address */
 227         bsa = sectors & ONENAND_BSA_MASK;
 228
 229         if (dataram1)
 230                 bsa |= ONENAND_BSA_DATARAM1;    /* DataRAM1 */
 231         else
 232                 bsa |= ONENAND_BSA_DATARAM0;    /* DataRAM0 */
 233
 234         /* BufferRAM Sector Count */
 235         bsc = count & ONENAND_BSC_MASK;
 236
 237         return ((bsa << ONENAND_BSA_SHIFT) | bsc);
 238 }
 239
 240 /**
 241  * flexonenand_block- For given address return block number
 242  * @param this         - OneNAND device structure
 243  * @param addr          - Address for which block number is needed
 244  */
 245 static unsigned flexonenand_block(struct onenand_chip *this, loff_t addr)
 246 {
 247         unsigned boundary, blk, die = 0;
 248
 249         if (ONENAND_IS_DDP(this) && addr >= this->diesize[0]) {
 250                 die = 1;
 251                 addr -= this->diesize[0];
 252         }
 253
 254         boundary = this->boundary[die];
 255
 256         blk = addr >> (this->erase_shift - 1);
 257         if (blk > boundary)
 258                 blk = (blk + boundary + 1) >> 1;
 259
 260         blk += die ? this->density_mask : 0;
 261         return blk;
 262 }
 263
 264 inline unsigned onenand_block(struct onenand_chip *this, loff_t addr)
 265 {
 266         if (!FLEXONENAND(this))
 267                 return addr >> this->erase_shift;
 268         return flexonenand_block(this, addr);
 269 }
 270
 271 /**
 272  * flexonenand_addr - Return address of the block
 273  * @this:               OneNAND device structure
 274  * @block:              Block number on Flex-OneNAND
 275  *
 276  * Return address of the block
 277  */
 278 static loff_t flexonenand_addr(struct onenand_chip *this, int block)
 279 {
 280         loff_t ofs = 0;
 281         int die = 0, boundary;
 282
 283         if (ONENAND_IS_DDP(this) && block >= this->density_mask) {
 284                 block -= this->density_mask;
 285                 die = 1;
 286                 ofs = this->diesize[0];
 287         }
 288
 289         boundary = this->boundary[die];
 290         ofs += (loff_t)block << (this->erase_shift - 1);
 291         if (block > (boundary + 1))
 292                 ofs += (loff_t)(block - boundary - 1) << (this->erase_shift - 1);
 293         return ofs;
 294 }
 295
 296 loff_t onenand_addr(struct onenand_chip *this, int block)
 297 {
 298         if (!FLEXONENAND(this))
 299                 return (loff_t)block << this->erase_shift;
 300         return flexonenand_addr(this, block);
 301 }
 302 EXPORT_SYMBOL(onenand_addr);
 303
 304 /**
 305  * onenand_get_density - [DEFAULT] Get OneNAND density
 306  * @param dev_id        OneNAND device ID
 307  *
 308  * Get OneNAND density from device ID
 309  */
 310 static inline int onenand_get_density(int dev_id)
 311 {
 312         int density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
 313         return (density & ONENAND_DEVICE_DENSITY_MASK);
 314 }
 315
 316 /**
 317  * flexonenand_region - [Flex-OneNAND] Return erase region of addr
 318  * @param mtd           MTD device structure
 319  * @param addr          address whose erase region needs to be identified
 320  */
 321 int flexonenand_region(struct mtd_info *mtd, loff_t addr)
 322 {
 323         int i;
 324
 325         for (i = 0; i < mtd->numeraseregions; i++)
 326                 if (addr < mtd->eraseregions[i].offset)
 327                         break;
 328         return i - 1;
 329 }
 330 EXPORT_SYMBOL(flexonenand_region);
 331
 332 /**
 333  * onenand_command - [DEFAULT] Send command to OneNAND device
 334  * @param mtd           MTD device structure
 335  * @param cmd           the command to be sent
 336  * @param addr          offset to read from or write to
 337  * @param len           number of bytes to read or write
 338  *
 339  * Send command to OneNAND device. This function is used for middle/large page
 340  * devices (1KB/2KB Bytes per page)
 341  */
 342 static int onenand_command(struct mtd_info *mtd, int cmd, loff_t addr, size_t len)
 343 {
 344         struct onenand_chip *this = mtd->priv;
 345         int value, block, page;
 346
 347         /* Address translation */
 348         switch (cmd) {
 349         case ONENAND_CMD_UNLOCK:
 350         case ONENAND_CMD_LOCK:
 351         case ONENAND_CMD_LOCK_TIGHT:
 352         case ONENAND_CMD_UNLOCK_ALL:
 353                 block = -1;
 354                 page = -1;
 355                 break;
 356
 357         case FLEXONENAND_CMD_PI_ACCESS:
 358                 /* addr contains die index */
 359                 block = addr * this->density_mask;
 360                 page = -1;
 361                 break;
 362
 363         case ONENAND_CMD_ERASE:
 364         case ONENAND_CMD_MULTIBLOCK_ERASE:
 365         case ONENAND_CMD_ERASE_VERIFY:
 366         case ONENAND_CMD_BUFFERRAM:
 367         case ONENAND_CMD_OTP_ACCESS:
 368                 block = onenand_block(this, addr);
 369                 page = -1;
 370                 break;
 371
 372         case FLEXONENAND_CMD_READ_PI:
 373                 cmd = ONENAND_CMD_READ;
 374                 block = addr * this->density_mask;
 375                 page = 0;
 376                 break;
 377
 378         default:
 379                 block = onenand_block(this, addr);
 380                 page = (int) (addr - onenand_addr(this, block)) >> this->page_shift;
 381
 382                 if (ONENAND_IS_2PLANE(this)) {
 383                         /* Make the even block number */
 384                         block &= ~1;
 385                         /* Is it the odd plane? */
 386                         if (addr & this->writesize)
 387                                 block++;
 388                         page >>= 1;
 389                 }
 390                 page &= this->page_mask;
 391                 break;
 392         }
 393
 394         /* NOTE: The setting order of the registers is very important! */
 395         if (cmd == ONENAND_CMD_BUFFERRAM) {
 396                 /* Select DataRAM for DDP */
 397                 value = onenand_bufferram_address(this, block);
 398                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 399
 400                 if (ONENAND_IS_MLC(this) || ONENAND_IS_2PLANE(this))
 401                         /* It is always BufferRAM0 */
 402                         ONENAND_SET_BUFFERRAM0(this);
 403                 else
 404                         /* Switch to the next data buffer */
 405                         ONENAND_SET_NEXT_BUFFERRAM(this);
 406
 407                 return 0;
 408         }
 409
 410         if (block != -1) {
 411                 /* Write 'DFS, FBA' of Flash */
 412                 value = onenand_block_address(this, block);
 413                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
 414
 415                 /* Select DataRAM for DDP */
 416                 value = onenand_bufferram_address(this, block);
 417                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 418         }
 419
 420         if (page != -1) {
 421                 /* Now we use page size operation */
 422                 int sectors = 0, count = 0;
 423                 int dataram;
 424
 425                 switch (cmd) {
 426                 case FLEXONENAND_CMD_RECOVER_LSB:
 427                 case ONENAND_CMD_READ:
 428                 case ONENAND_CMD_READOOB:
 429                         if (ONENAND_IS_MLC(this))
 430                                 /* It is always BufferRAM0 */
 431                                 dataram = ONENAND_SET_BUFFERRAM0(this);
 432                         else
 433                                 dataram = ONENAND_SET_NEXT_BUFFERRAM(this);
 434                         break;
 435
 436                 default:
 437                         if (ONENAND_IS_2PLANE(this) && cmd == ONENAND_CMD_PROG)
 438                                 cmd = ONENAND_CMD_2X_PROG;
 439                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
 440                         break;
 441                 }
 442
 443                 /* Write 'FPA, FSA' of Flash */
 444                 value = onenand_page_address(page, sectors);
 445                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS8);
 446
 447                 /* Write 'BSA, BSC' of DataRAM */
 448                 value = onenand_buffer_address(dataram, sectors, count);
 449                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
 450         }
 451
 452         /* Interrupt clear */
 453         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
 454
 455         /* Write command */
 456         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
 457
 458         return 0;
 459 }
 460
 461 /**
 462  * onenand_read_ecc - return ecc status
 463  * @param this          onenand chip structure
 464  */
 465 static inline int onenand_read_ecc(struct onenand_chip *this)
 466 {
 467         int ecc, i, result = 0;
 468
 469         if (!FLEXONENAND(this))
 470                 return this->read_word(this->base + ONENAND_REG_ECC_STATUS);
 471
 472         for (i = 0; i < 4; i++) {
 473                 ecc = this->read_word(this->base + ONENAND_REG_ECC_STATUS + i);
 474                 if (likely(!ecc))
 475                         continue;
 476                 if (ecc & FLEXONENAND_UNCORRECTABLE_ERROR)
 477                         return ONENAND_ECC_2BIT_ALL;
 478                 else
 479                         result = ONENAND_ECC_1BIT_ALL;
 480         }
 481
 482         return result;
 483 }
 484
 485 /**
 486  * onenand_wait - [DEFAULT] wait until the command is done
 487  * @param mtd           MTD device structure
 488  * @param state         state to select the max. timeout value
 489  *
 490  * Wait for command done. This applies to all OneNAND command
 491  * Read can take up to 30us, erase up to 2ms and program up to 350us
 492  * according to general OneNAND specs
 493  */
 494 static int onenand_wait(struct mtd_info *mtd, int state)
 495 {
 496         struct onenand_chip * this = mtd->priv;
 497         unsigned long timeout;
 498         unsigned int flags = ONENAND_INT_MASTER;
 499         unsigned int interrupt = 0;
 500         unsigned int ctrl;
 501
 502         /* The 20 msec is enough */
 503         timeout = jiffies + msecs_to_jiffies(20);
 504         while (time_before(jiffies, timeout)) {
 505                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 506
 507                 if (interrupt & flags)
 508                         break;
 509
 510                 if (state != FL_READING && state != FL_PREPARING_ERASE)
 511                         cond_resched();
 512         }
 513         /* To get correct interrupt status in timeout case */
 514         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
 515
 516         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
 517
 518         /*
 519          * In the Spec. it checks the controller status first
 520          * However if you get the correct information in case of
 521          * power off recovery (POR) test, it should read ECC status first
 522          */
 523         if (interrupt & ONENAND_INT_READ) {
 524                 int ecc = onenand_read_ecc(this);
 525                 if (ecc) {
 526                         if (ecc & ONENAND_ECC_2BIT_ALL) {
 527                                 printk(KERN_ERR "%s: ECC error = 0x%04x\n",
 528                                         __func__, ecc);
 529                                 mtd->ecc_stats.failed++;
 530                                 return -EBADMSG;
 531                         } else if (ecc & ONENAND_ECC_1BIT_ALL) {
 532                                 printk(KERN_DEBUG "%s: correctable ECC error = 0x%04x\n",
 533                                         __func__, ecc);
 534                                 mtd->ecc_stats.corrected++;
 535                         }
 536                 }
 537         } else if (state == FL_READING) {
 538                 printk(KERN_ERR "%s: read timeout! ctrl=0x%04x intr=0x%04x\n",
 539                         __func__, ctrl, interrupt);
 540                 return -EIO;
 541         }
 542
 543         if (state == FL_PREPARING_ERASE && !(interrupt & ONENAND_INT_ERASE)) {
 544                 printk(KERN_ERR "%s: mb erase timeout! ctrl=0x%04x intr=0x%04x\n",
 545                        __func__, ctrl, interrupt);
 546                 return -EIO;
 547         }
 548
 549         if (!(interrupt & ONENAND_INT_MASTER)) {
 550                 printk(KERN_ERR "%s: timeout! ctrl=0x%04x intr=0x%04x\n",
 551                        __func__, ctrl, interrupt);
 552                 return -EIO;
 553         }
 554
 555         /* If there's controller error, it's a real error */
 556         if (ctrl & ONENAND_CTRL_ERROR) {
 557                 printk(KERN_ERR "%s: controller error = 0x%04x\n",
 558                         __func__, ctrl);
 559                 if (ctrl & ONENAND_CTRL_LOCK)
 560                         printk(KERN_ERR "%s: it's locked error.\n", __func__);
 561                 return -EIO;
 562         }
 563
 564         return 0;
 565 }
 566
 567 /*
 568  * onenand_interrupt - [DEFAULT] onenand interrupt handler
 569  * @param irq           onenand interrupt number
 570  * @param dev_id        interrupt data
 571  *
 572  * complete the work
 573  */
 574 static irqreturn_t onenand_interrupt(int irq, void *data)
 575 {
 576         struct onenand_chip *this = data;
 577
 578         /* To handle shared interrupt */
 579         if (!this->complete.done)
 580                 complete(&this->complete);
 581
 582         return IRQ_HANDLED;
 583 }
 584
 585 /*
 586  * onenand_interrupt_wait - [DEFAULT] wait until the command is done
 587  * @param mtd           MTD device structure
 588  * @param state         state to select the max. timeout value
 589  *
 590  * Wait for command done.
 591  */
 592 static int onenand_interrupt_wait(struct mtd_info *mtd, int state)
 593 {
 594         struct onenand_chip *this = mtd->priv;
 595
 596         wait_for_completion(&this->complete);
 597
 598         return onenand_wait(mtd, state);
 599 }
 600
 601 /*
 602  * onenand_try_interrupt_wait - [DEFAULT] try interrupt wait
 603  * @param mtd           MTD device structure
 604  * @param state         state to select the max. timeout value
 605  *
 606  * Try interrupt based wait (It is used one-time)
 607  */
 608 static int onenand_try_interrupt_wait(struct mtd_info *mtd, int state)
 609 {
 610         struct onenand_chip *this = mtd->priv;
 611         unsigned long remain, timeout;
 612
 613         /* We use interrupt wait first */
 614         this->wait = onenand_interrupt_wait;
 615
 616         timeout = msecs_to_jiffies(100);
 617         remain = wait_for_completion_timeout(&this->complete, timeout);
 618         if (!remain) {
 619                 printk(KERN_INFO "OneNAND: There's no interrupt. "
 620                                 "We use the normal wait\n");
 621
 622                 /* Release the irq */
 623                 free_irq(this->irq, this);
 624
 625                 this->wait = onenand_wait;
 626         }
 627
 628         return onenand_wait(mtd, state);
 629 }
 630
 631 /*
 632  * onenand_setup_wait - [OneNAND Interface] setup onenand wait method
 633  * @param mtd           MTD device structure
 634  *
 635  * There's two method to wait onenand work
 636  * 1. polling - read interrupt status register
 637  * 2. interrupt - use the kernel interrupt method
 638  */
 639 static void onenand_setup_wait(struct mtd_info *mtd)
 640 {
 641         struct onenand_chip *this = mtd->priv;
 642         int syscfg;
 643
 644         init_completion(&this->complete);
 645
 646         if (this->irq <= 0) {
 647                 this->wait = onenand_wait;
 648                 return;
 649         }
 650
 651         if (request_irq(this->irq, &onenand_interrupt,
 652                                 IRQF_SHARED, "onenand", this)) {
 653                 /* If we can't get irq, use the normal wait */
 654                 this->wait = onenand_wait;
 655                 return;
 656         }
 657
 658         /* Enable interrupt */
 659         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
 660         syscfg |= ONENAND_SYS_CFG1_IOBE;
 661         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
 662
 663         this->wait = onenand_try_interrupt_wait;
 664 }
 665
 666 /**
 667  * onenand_bufferram_offset - [DEFAULT] BufferRAM offset
 668  * @param mtd           MTD data structure
 669  * @param area          BufferRAM area
 670  * @return              offset given area
 671  *
 672  * Return BufferRAM offset given area
 673  */
 674 static inline int onenand_bufferram_offset(struct mtd_info *mtd, int area)
 675 {
 676         struct onenand_chip *this = mtd->priv;
 677
 678         if (ONENAND_CURRENT_BUFFERRAM(this)) {
 679                 /* Note: the 'this->writesize' is a real page size */
 680                 if (area == ONENAND_DATARAM)
 681                         return this->writesize;
 682                 if (area == ONENAND_SPARERAM)
 683                         return mtd->oobsize;
 684         }
 685
 686         return 0;
 687 }
 688
 689 /**
 690  * onenand_read_bufferram - [OneNAND Interface] Read the bufferram area
 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
 698  */
 699 static int onenand_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         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 710                 unsigned short word;
 711
 712                 /* Align with word(16-bit) size */
 713                 count--;
 714
 715                 /* Read word and save byte */
 716                 word = this->read_word(bufferram + offset + count);
 717                 buffer[count] = (word & 0xff);
 718         }
 719
 720         memcpy(buffer, bufferram + offset, count);
 721
 722         return 0;
 723 }
 724
 725 /**
 726  * onenand_sync_read_bufferram - [OneNAND Interface] Read the bufferram area with Sync. Burst mode
 727  * @param mtd           MTD data structure
 728  * @param area          BufferRAM area
 729  * @param buffer        the databuffer to put/get data
 730  * @param offset        offset to read from or write to
 731  * @param count         number of bytes to read/write
 732  *
 733  * Read the BufferRAM area with Sync. Burst Mode
 734  */
 735 static int onenand_sync_read_bufferram(struct mtd_info *mtd, int area,
 736                 unsigned char *buffer, int offset, size_t count)
 737 {
 738         struct onenand_chip *this = mtd->priv;
 739         void __iomem *bufferram;
 740
 741         bufferram = this->base + area;
 742
 743         bufferram += onenand_bufferram_offset(mtd, area);
 744
 745         this->mmcontrol(mtd, ONENAND_SYS_CFG1_SYNC_READ);
 746
 747         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 748                 unsigned short word;
 749
 750                 /* Align with word(16-bit) size */
 751                 count--;
 752
 753                 /* Read word and save byte */
 754                 word = this->read_word(bufferram + offset + count);
 755                 buffer[count] = (word & 0xff);
 756         }
 757
 758         memcpy(buffer, bufferram + offset, count);
 759
 760         this->mmcontrol(mtd, 0);
 761
 762         return 0;
 763 }
 764
 765 /**
 766  * onenand_write_bufferram - [OneNAND Interface] Write the bufferram area
 767  * @param mtd           MTD data structure
 768  * @param area          BufferRAM area
 769  * @param buffer        the databuffer to put/get data
 770  * @param offset        offset to read from or write to
 771  * @param count         number of bytes to read/write
 772  *
 773  * Write the BufferRAM area
 774  */
 775 static int onenand_write_bufferram(struct mtd_info *mtd, int area,
 776                 const unsigned char *buffer, int offset, size_t count)
 777 {
 778         struct onenand_chip *this = mtd->priv;
 779         void __iomem *bufferram;
 780
 781         bufferram = this->base + area;
 782
 783         bufferram += onenand_bufferram_offset(mtd, area);
 784
 785         if (ONENAND_CHECK_BYTE_ACCESS(count)) {
 786                 unsigned short word;
 787                 int byte_offset;
 788
 789                 /* Align with word(16-bit) size */
 790                 count--;
 791
 792                 /* Calculate byte access offset */
 793                 byte_offset = offset + count;
 794
 795                 /* Read word and save byte */
 796                 word = this->read_word(bufferram + byte_offset);
 797                 word = (word & ~0xff) | buffer[count];
 798                 this->write_word(word, bufferram + byte_offset);
 799         }
 800
 801         memcpy(bufferram + offset, buffer, count);
 802
 803         return 0;
 804 }
 805
 806 /**
 807  * onenand_get_2x_blockpage - [GENERIC] Get blockpage at 2x program mode
 808  * @param mtd           MTD data structure
 809  * @param addr          address to check
 810  * @return              blockpage address
 811  *
 812  * Get blockpage address at 2x program mode
 813  */
 814 static int onenand_get_2x_blockpage(struct mtd_info *mtd, loff_t addr)
 815 {
 816         struct onenand_chip *this = mtd->priv;
 817         int blockpage, block, page;
 818
 819         /* Calculate the even block number */
 820         block = (int) (addr >> this->erase_shift) & ~1;
 821         /* Is it the odd plane? */
 822         if (addr & this->writesize)
 823                 block++;
 824         page = (int) (addr >> (this->page_shift + 1)) & this->page_mask;
 825         blockpage = (block << 7) | page;
 826
 827         return blockpage;
 828 }
 829
 830 /**
 831  * onenand_check_bufferram - [GENERIC] Check BufferRAM information
 832  * @param mtd           MTD data structure
 833  * @param addr          address to check
 834  * @return              1 if there are valid data, otherwise 0
 835  *
 836  * Check bufferram if there is data we required
 837  */
 838 static int onenand_check_bufferram(struct mtd_info *mtd, loff_t addr)
 839 {
 840         struct onenand_chip *this = mtd->priv;
 841         int blockpage, found = 0;
 842         unsigned int i;
 843
 844         if (ONENAND_IS_2PLANE(this))
 845                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 846         else
 847                 blockpage = (int) (addr >> this->page_shift);
 848
 849         /* Is there valid data? */
 850         i = ONENAND_CURRENT_BUFFERRAM(this);
 851         if (this->bufferram[i].blockpage == blockpage)
 852                 found = 1;
 853         else {
 854                 /* Check another BufferRAM */
 855                 i = ONENAND_NEXT_BUFFERRAM(this);
 856                 if (this->bufferram[i].blockpage == blockpage) {
 857                         ONENAND_SET_NEXT_BUFFERRAM(this);
 858                         found = 1;
 859                 }
 860         }
 861
 862         if (found && ONENAND_IS_DDP(this)) {
 863                 /* Select DataRAM for DDP */
 864                 int block = onenand_block(this, addr);
 865                 int value = onenand_bufferram_address(this, block);
 866                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
 867         }
 868
 869         return found;
 870 }
 871
 872 /**
 873  * onenand_update_bufferram - [GENERIC] Update BufferRAM information
 874  * @param mtd           MTD data structure
 875  * @param addr          address to update
 876  * @param valid         valid flag
 877  *
 878  * Update BufferRAM information
 879  */
 880 static void onenand_update_bufferram(struct mtd_info *mtd, loff_t addr,
 881                 int valid)
 882 {
 883         struct onenand_chip *this = mtd->priv;
 884         int blockpage;
 885         unsigned int i;
 886
 887         if (ONENAND_IS_2PLANE(this))
 888                 blockpage = onenand_get_2x_blockpage(mtd, addr);
 889         else
 890                 blockpage = (int) (addr >> this->page_shift);
 891
 892         /* Invalidate another BufferRAM */
 893         i = ONENAND_NEXT_BUFFERRAM(this);
 894         if (this->bufferram[i].blockpage == blockpage)
 895                 this->bufferram[i].blockpage = -1;
 896
 897         /* Update BufferRAM */
 898         i = ONENAND_CURRENT_BUFFERRAM(this);
 899         if (valid)
 900                 this->bufferram[i].blockpage = blockpage;
 901         else
 902                 this->bufferram[i].blockpage = -1;
 903 }
 904
 905 /**
 906  * onenand_invalidate_bufferram - [GENERIC] Invalidate BufferRAM information
 907  * @param mtd           MTD data structure
 908  * @param addr          start address to invalidate
 909  * @param len           length to invalidate
 910  *
 911  * Invalidate BufferRAM information
 912  */
 913 static void onenand_invalidate_bufferram(struct mtd_info *mtd, loff_t addr,
 914                 unsigned int len)
 915 {
 916         struct onenand_chip *this = mtd->priv;
 917         int i;
 918         loff_t end_addr = addr + len;
 919
 920         /* Invalidate BufferRAM */
 921         for (i = 0; i < MAX_BUFFERRAM; i++) {
 922                 loff_t buf_addr = this->bufferram[i].blockpage << this->page_shift;
 923                 if (buf_addr >= addr && buf_addr < end_addr)
 924                         this->bufferram[i].blockpage = -1;
 925         }
 926 }
 927
 928 /**
 929  * onenand_get_device - [GENERIC] Get chip for selected access
 930  * @param mtd           MTD device structure
 931  * @param new_state     the state which is requested
 932  *
 933  * Get the device and lock it for exclusive access
 934  */
 935 static int onenand_get_device(struct mtd_info *mtd, int new_state)
 936 {
 937         struct onenand_chip *this = mtd->priv;
 938         DECLARE_WAITQUEUE(wait, current);
 939
 940         /*
 941          * Grab the lock and see if the device is available
 942          */
 943         while (1) {
 944                 spin_lock(&this->chip_lock);
 945                 if (this->state == FL_READY) {
 946                         this->state = new_state;
 947                         spin_unlock(&this->chip_lock);
 948                         break;
 949                 }
 950                 if (new_state == FL_PM_SUSPENDED) {
 951                         spin_unlock(&this->chip_lock);
 952                         return (this->state == FL_PM_SUSPENDED) ? 0 : -EAGAIN;
 953                 }
 954                 set_current_state(TASK_UNINTERRUPTIBLE);
 955                 add_wait_queue(&this->wq, &wait);
 956                 spin_unlock(&this->chip_lock);
 957                 schedule();
 958                 remove_wait_queue(&this->wq, &wait);
 959         }
 960
 961         return 0;
 962 }
 963
 964 /**
 965  * onenand_release_device - [GENERIC] release chip
 966  * @param mtd           MTD device structure
 967  *
 968  * Deselect, release chip lock and wake up anyone waiting on the device
 969  */
 970 static void onenand_release_device(struct mtd_info *mtd)
 971 {
 972         struct onenand_chip *this = mtd->priv;
 973
 974         /* Release the chip */
 975         spin_lock(&this->chip_lock);
 976         this->state = FL_READY;
 977         wake_up(&this->wq);
 978         spin_unlock(&this->chip_lock);
 979 }
 980
 981 /**
 982  * onenand_transfer_auto_oob - [Internal] oob auto-placement transfer
 983  * @param mtd           MTD device structure
 984  * @param buf           destination address
 985  * @param column        oob offset to read from
 986  * @param thislen       oob length to read
 987  */
 988 static int onenand_transfer_auto_oob(struct mtd_info *mtd, uint8_t *buf, int column,
 989                                 int thislen)
 990 {
 991         struct onenand_chip *this = mtd->priv;
 992         struct nand_oobfree *free;
 993         int readcol = column;
 994         int readend = column + thislen;
 995         int lastgap = 0;
 996         unsigned int i;
 997         uint8_t *oob_buf = this->oob_buf;
 998
 999         free = this->ecclayout->oobfree;
1000         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1001                 if (readcol >= lastgap)
1002                         readcol += free->offset - lastgap;
1003                 if (readend >= lastgap)
1004                         readend += free->offset - lastgap;
1005                 lastgap = free->offset + free->length;
1006         }
1007         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1008         free = this->ecclayout->oobfree;
1009         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1010                 int free_end = free->offset + free->length;
1011                 if (free->offset < readend && free_end > readcol) {
1012                         int st = max_t(int,free->offset,readcol);
1013                         int ed = min_t(int,free_end,readend);
1014                         int n = ed - st;
1015                         memcpy(buf, oob_buf + st, n);
1016                         buf += n;
1017                 } else if (column == 0)
1018                         break;
1019         }
1020         return 0;
1021 }
1022
1023 /**
1024  * onenand_recover_lsb - [Flex-OneNAND] Recover LSB page data
1025  * @param mtd           MTD device structure
1026  * @param addr          address to recover
1027  * @param status        return value from onenand_wait / onenand_bbt_wait
1028  *
1029  * MLC NAND Flash cell has paired pages - LSB page and MSB page. LSB page has
1030  * lower page address and MSB page has higher page address in paired pages.
1031  * If power off occurs during MSB page program, the paired LSB page data can
1032  * become corrupt. LSB page recovery read is a way to read LSB page though page
1033  * data are corrupted. When uncorrectable error occurs as a result of LSB page
1034  * read after power up, issue LSB page recovery read.
1035  */
1036 static int onenand_recover_lsb(struct mtd_info *mtd, loff_t addr, int status)
1037 {
1038         struct onenand_chip *this = mtd->priv;
1039         int i;
1040
1041         /* Recovery is only for Flex-OneNAND */
1042         if (!FLEXONENAND(this))
1043                 return status;
1044
1045         /* check if we failed due to uncorrectable error */
1046         if (status != -EBADMSG && status != ONENAND_BBT_READ_ECC_ERROR)
1047                 return status;
1048
1049         /* check if address lies in MLC region */
1050         i = flexonenand_region(mtd, addr);
1051         if (mtd->eraseregions[i].erasesize < (1 << this->erase_shift))
1052                 return status;
1053
1054         /* We are attempting to reread, so decrement stats.failed
1055          * which was incremented by onenand_wait due to read failure
1056          */
1057         printk(KERN_INFO "%s: Attempting to recover from uncorrectable read\n",
1058                 __func__);
1059         mtd->ecc_stats.failed--;
1060
1061         /* Issue the LSB page recovery command */
1062         this->command(mtd, FLEXONENAND_CMD_RECOVER_LSB, addr, this->writesize);
1063         return this->wait(mtd, FL_READING);
1064 }
1065
1066 /**
1067  * onenand_mlc_read_ops_nolock - MLC OneNAND read main and/or out-of-band
1068  * @param mtd           MTD device structure
1069  * @param from          offset to read from
1070  * @param ops:          oob operation description structure
1071  *
1072  * MLC OneNAND / Flex-OneNAND has 4KB page size and 4KB dataram.
1073  * So, read-while-load is not present.
1074  */
1075 static int onenand_mlc_read_ops_nolock(struct mtd_info *mtd, loff_t from,
1076                                 struct mtd_oob_ops *ops)
1077 {
1078         struct onenand_chip *this = mtd->priv;
1079         struct mtd_ecc_stats stats;
1080         size_t len = ops->len;
1081         size_t ooblen = ops->ooblen;
1082         u_char *buf = ops->datbuf;
1083         u_char *oobbuf = ops->oobbuf;
1084         int read = 0, column, thislen;
1085         int oobread = 0, oobcolumn, thisooblen, oobsize;
1086         int ret = 0;
1087         int writesize = this->writesize;
1088
1089         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %i\n",
1090               __func__, (unsigned int) from, (int) len);
1091
1092         if (ops->mode == MTD_OOB_AUTO)
1093                 oobsize = this->ecclayout->oobavail;
1094         else
1095                 oobsize = mtd->oobsize;
1096
1097         oobcolumn = from & (mtd->oobsize - 1);
1098
1099         /* Do not allow reads past end of device */
1100         if (from + len > mtd->size) {
1101                 printk(KERN_ERR "%s: Attempt read beyond end of device\n",
1102                         __func__);
1103                 ops->retlen = 0;
1104                 ops->oobretlen = 0;
1105                 return -EINVAL;
1106         }
1107
1108         stats = mtd->ecc_stats;
1109
1110         while (read < len) {
1111                 cond_resched();
1112
1113                 thislen = min_t(int, writesize, len - read);
1114
1115                 column = from & (writesize - 1);
1116                 if (column + thislen > writesize)
1117                         thislen = writesize - column;
1118
1119                 if (!onenand_check_bufferram(mtd, from)) {
1120                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
1121
1122                         ret = this->wait(mtd, FL_READING);
1123                         if (unlikely(ret))
1124                                 ret = onenand_recover_lsb(mtd, from, ret);
1125                         onenand_update_bufferram(mtd, from, !ret);
1126                         if (ret == -EBADMSG)
1127                                 ret = 0;
1128                 }
1129
1130                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
1131                 if (oobbuf) {
1132                         thisooblen = oobsize - oobcolumn;
1133                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
1134
1135                         if (ops->mode == MTD_OOB_AUTO)
1136                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
1137                         else
1138                                 this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
1139                         oobread += thisooblen;
1140                         oobbuf += thisooblen;
1141                         oobcolumn = 0;
1142                 }
1143
1144                 read += thislen;
1145                 if (read == len)
1146                         break;
1147
1148                 from += thislen;
1149                 buf += thislen;
1150         }
1151
1152         /*
1153          * Return success, if no ECC failures, else -EBADMSG
1154          * fs driver will take care of that, because
1155          * retlen == desired len and result == -EBADMSG
1156          */
1157         ops->retlen = read;
1158         ops->oobretlen = oobread;
1159
1160         if (ret)
1161                 return ret;
1162
1163         if (mtd->ecc_stats.failed - stats.failed)
1164                 return -EBADMSG;
1165
1166         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
1167 }
1168
1169 /**
1170  * onenand_read_ops_nolock - [OneNAND Interface] OneNAND read main and/or out-of-band
1171  * @param mtd           MTD device structure
1172  * @param from          offset to read from
1173  * @param ops:          oob operation description structure
1174  *
1175  * OneNAND read main and/or out-of-band data
1176  */
1177 static int onenand_read_ops_nolock(struct mtd_info *mtd, loff_t from,
1178                                 struct mtd_oob_ops *ops)
1179 {
1180         struct onenand_chip *this = mtd->priv;
1181         struct mtd_ecc_stats stats;
1182         size_t len = ops->len;
1183         size_t ooblen = ops->ooblen;
1184         u_char *buf = ops->datbuf;
1185         u_char *oobbuf = ops->oobbuf;
1186         int read = 0, column, thislen;
1187         int oobread = 0, oobcolumn, thisooblen, oobsize;
1188         int ret = 0, boundary = 0;
1189         int writesize = this->writesize;
1190
1191         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %i\n",
1192                         __func__, (unsigned int) from, (int) len);
1193
1194         if (ops->mode == MTD_OOB_AUTO)
1195                 oobsize = this->ecclayout->oobavail;
1196         else
1197                 oobsize = mtd->oobsize;
1198
1199         oobcolumn = from & (mtd->oobsize - 1);
1200
1201         /* Do not allow reads past end of device */
1202         if ((from + len) > mtd->size) {
1203                 printk(KERN_ERR "%s: Attempt read beyond end of device\n",
1204                         __func__);
1205                 ops->retlen = 0;
1206                 ops->oobretlen = 0;
1207                 return -EINVAL;
1208         }
1209
1210         stats = mtd->ecc_stats;
1211
1212         /* Read-while-load method */
1213
1214         /* Do first load to bufferRAM */
1215         if (read < len) {
1216                 if (!onenand_check_bufferram(mtd, from)) {
1217                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
1218                         ret = this->wait(mtd, FL_READING);
1219                         onenand_update_bufferram(mtd, from, !ret);
1220                         if (ret == -EBADMSG)
1221                                 ret = 0;
1222                 }
1223         }
1224
1225         thislen = min_t(int, writesize, len - read);
1226         column = from & (writesize - 1);
1227         if (column + thislen > writesize)
1228                 thislen = writesize - column;
1229
1230         while (!ret) {
1231                 /* If there is more to load then start next load */
1232                 from += thislen;
1233                 if (read + thislen < len) {
1234                         this->command(mtd, ONENAND_CMD_READ, from, writesize);
1235                         /*
1236                          * Chip boundary handling in DDP
1237                          * Now we issued chip 1 read and pointed chip 1
1238                          * bufferram so we have to point chip 0 bufferram.
1239                          */
1240                         if (ONENAND_IS_DDP(this) &&
1241                             unlikely(from == (this->chipsize >> 1))) {
1242                                 this->write_word(ONENAND_DDP_CHIP0, this->base + ONENAND_REG_START_ADDRESS2);
1243                                 boundary = 1;
1244                         } else
1245                                 boundary = 0;
1246                         ONENAND_SET_PREV_BUFFERRAM(this);
1247                 }
1248                 /* While load is going, read from last bufferRAM */
1249                 this->read_bufferram(mtd, ONENAND_DATARAM, buf, column, thislen);
1250
1251                 /* Read oob area if needed */
1252                 if (oobbuf) {
1253                         thisooblen = oobsize - oobcolumn;
1254                         thisooblen = min_t(int, thisooblen, ooblen - oobread);
1255
1256                         if (ops->mode == MTD_OOB_AUTO)
1257                                 onenand_transfer_auto_oob(mtd, oobbuf, oobcolumn, thisooblen);
1258                         else
1259                                 this->read_bufferram(mtd, ONENAND_SPARERAM, oobbuf, oobcolumn, thisooblen);
1260                         oobread += thisooblen;
1261                         oobbuf += thisooblen;
1262                         oobcolumn = 0;
1263                 }
1264
1265                 /* See if we are done */
1266                 read += thislen;
1267                 if (read == len)
1268                         break;
1269                 /* Set up for next read from bufferRAM */
1270                 if (unlikely(boundary))
1271                         this->write_word(ONENAND_DDP_CHIP1, this->base + ONENAND_REG_START_ADDRESS2);
1272                 ONENAND_SET_NEXT_BUFFERRAM(this);
1273                 buf += thislen;
1274                 thislen = min_t(int, writesize, len - read);
1275                 column = 0;
1276                 cond_resched();
1277                 /* Now wait for load */
1278                 ret = this->wait(mtd, FL_READING);
1279                 onenand_update_bufferram(mtd, from, !ret);
1280                 if (ret == -EBADMSG)
1281                         ret = 0;
1282         }
1283
1284         /*
1285          * Return success, if no ECC failures, else -EBADMSG
1286          * fs driver will take care of that, because
1287          * retlen == desired len and result == -EBADMSG
1288          */
1289         ops->retlen = read;
1290         ops->oobretlen = oobread;
1291
1292         if (ret)
1293                 return ret;
1294
1295         if (mtd->ecc_stats.failed - stats.failed)
1296                 return -EBADMSG;
1297
1298         return mtd->ecc_stats.corrected - stats.corrected ? -EUCLEAN : 0;
1299 }
1300
1301 /**
1302  * onenand_read_oob_nolock - [MTD Interface] OneNAND read out-of-band
1303  * @param mtd           MTD device structure
1304  * @param from          offset to read from
1305  * @param ops:          oob operation description structure
1306  *
1307  * OneNAND read out-of-band data from the spare area
1308  */
1309 static int onenand_read_oob_nolock(struct mtd_info *mtd, loff_t from,
1310                         struct mtd_oob_ops *ops)
1311 {
1312         struct onenand_chip *this = mtd->priv;
1313         struct mtd_ecc_stats stats;
1314         int read = 0, thislen, column, oobsize;
1315         size_t len = ops->ooblen;
1316         mtd_oob_mode_t mode = ops->mode;
1317         u_char *buf = ops->oobbuf;
1318         int ret = 0, readcmd;
1319
1320         from += ops->ooboffs;
1321
1322         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %i\n",
1323                 __func__, (unsigned int) from, (int) len);
1324
1325         /* Initialize return length value */
1326         ops->oobretlen = 0;
1327
1328         if (mode == MTD_OOB_AUTO)
1329                 oobsize = this->ecclayout->oobavail;
1330         else
1331                 oobsize = mtd->oobsize;
1332
1333         column = from & (mtd->oobsize - 1);
1334
1335         if (unlikely(column >= oobsize)) {
1336                 printk(KERN_ERR "%s: Attempted to start read outside oob\n",
1337                         __func__);
1338                 return -EINVAL;
1339         }
1340
1341         /* Do not allow reads past end of device */
1342         if (unlikely(from >= mtd->size ||
1343                      column + len > ((mtd->size >> this->page_shift) -
1344                                      (from >> this->page_shift)) * oobsize)) {
1345                 printk(KERN_ERR "%s: Attempted to read beyond end of device\n",
1346                         __func__);
1347                 return -EINVAL;
1348         }
1349
1350         stats = mtd->ecc_stats;
1351
1352         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1353
1354         while (read < len) {
1355                 cond_resched();
1356
1357                 thislen = oobsize - column;
1358                 thislen = min_t(int, thislen, len);
1359
1360                 this->command(mtd, readcmd, from, mtd->oobsize);
1361
1362                 onenand_update_bufferram(mtd, from, 0);
1363
1364                 ret = this->wait(mtd, FL_READING);
1365                 if (unlikely(ret))
1366                         ret = onenand_recover_lsb(mtd, from, ret);
1367
1368                 if (ret && ret != -EBADMSG) {
1369                         printk(KERN_ERR "%s: read failed = 0x%x\n",
1370                                 __func__, ret);
1371                         break;
1372                 }
1373
1374                 if (mode == MTD_OOB_AUTO)
1375                         onenand_transfer_auto_oob(mtd, buf, column, thislen);
1376                 else
1377                         this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1378
1379                 read += thislen;
1380
1381                 if (read == len)
1382                         break;
1383
1384                 buf += thislen;
1385
1386                 /* Read more? */
1387                 if (read < len) {
1388                         /* Page size */
1389                         from += mtd->writesize;
1390                         column = 0;
1391                 }
1392         }
1393
1394         ops->oobretlen = read;
1395
1396         if (ret)
1397                 return ret;
1398
1399         if (mtd->ecc_stats.failed - stats.failed)
1400                 return -EBADMSG;
1401
1402         return 0;
1403 }
1404
1405 /**
1406  * onenand_read - [MTD Interface] Read data from flash
1407  * @param mtd           MTD device structure
1408  * @param from          offset to read from
1409  * @param len           number of bytes to read
1410  * @param retlen        pointer to variable to store the number of read bytes
1411  * @param buf           the databuffer to put data
1412  *
1413  * Read with ecc
1414 */
1415 static int onenand_read(struct mtd_info *mtd, loff_t from, size_t len,
1416         size_t *retlen, u_char *buf)
1417 {
1418         struct onenand_chip *this = mtd->priv;
1419         struct mtd_oob_ops ops = {
1420                 .len    = len,
1421                 .ooblen = 0,
1422                 .datbuf = buf,
1423                 .oobbuf = NULL,
1424         };
1425         int ret;
1426
1427         onenand_get_device(mtd, FL_READING);
1428         ret = ONENAND_IS_MLC(this) ?
1429                 onenand_mlc_read_ops_nolock(mtd, from, &ops) :
1430                 onenand_read_ops_nolock(mtd, from, &ops);
1431         onenand_release_device(mtd);
1432
1433         *retlen = ops.retlen;
1434         return ret;
1435 }
1436
1437 /**
1438  * onenand_read_oob - [MTD Interface] Read main and/or out-of-band
1439  * @param mtd:          MTD device structure
1440  * @param from:         offset to read from
1441  * @param ops:          oob operation description structure
1442
1443  * Read main and/or out-of-band
1444  */
1445 static int onenand_read_oob(struct mtd_info *mtd, loff_t from,
1446                             struct mtd_oob_ops *ops)
1447 {
1448         struct onenand_chip *this = mtd->priv;
1449         int ret;
1450
1451         switch (ops->mode) {
1452         case MTD_OOB_PLACE:
1453         case MTD_OOB_AUTO:
1454                 break;
1455         case MTD_OOB_RAW:
1456                 /* Not implemented yet */
1457         default:
1458                 return -EINVAL;
1459         }
1460
1461         onenand_get_device(mtd, FL_READING);
1462         if (ops->datbuf)
1463                 ret = ONENAND_IS_MLC(this) ?
1464                         onenand_mlc_read_ops_nolock(mtd, from, ops) :
1465                         onenand_read_ops_nolock(mtd, from, ops);
1466         else
1467                 ret = onenand_read_oob_nolock(mtd, from, ops);
1468         onenand_release_device(mtd);
1469
1470         return ret;
1471 }
1472
1473 /**
1474  * onenand_bbt_wait - [DEFAULT] wait until the command is done
1475  * @param mtd           MTD device structure
1476  * @param state         state to select the max. timeout value
1477  *
1478  * Wait for command done.
1479  */
1480 static int onenand_bbt_wait(struct mtd_info *mtd, int state)
1481 {
1482         struct onenand_chip *this = mtd->priv;
1483         unsigned long timeout;
1484         unsigned int interrupt;
1485         unsigned int ctrl;
1486
1487         /* The 20 msec is enough */
1488         timeout = jiffies + msecs_to_jiffies(20);
1489         while (time_before(jiffies, timeout)) {
1490                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1491                 if (interrupt & ONENAND_INT_MASTER)
1492                         break;
1493         }
1494         /* To get correct interrupt status in timeout case */
1495         interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1496         ctrl = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
1497
1498         if (interrupt & ONENAND_INT_READ) {
1499                 int ecc = onenand_read_ecc(this);
1500                 if (ecc & ONENAND_ECC_2BIT_ALL) {
1501                         printk(KERN_WARNING "%s: ecc error = 0x%04x, "
1502                                 "controller error 0x%04x\n",
1503                                 __func__, ecc, ctrl);
1504                         return ONENAND_BBT_READ_ECC_ERROR;
1505                 }
1506         } else {
1507                 printk(KERN_ERR "%s: read timeout! ctrl=0x%04x intr=0x%04x\n",
1508                         __func__, ctrl, interrupt);
1509                 return ONENAND_BBT_READ_FATAL_ERROR;
1510         }
1511
1512         /* Initial bad block case: 0x2400 or 0x0400 */
1513         if (ctrl & ONENAND_CTRL_ERROR) {
1514                 printk(KERN_DEBUG "%s: controller error = 0x%04x\n",
1515                         __func__, ctrl);
1516                 return ONENAND_BBT_READ_ERROR;
1517         }
1518
1519         return 0;
1520 }
1521
1522 /**
1523  * onenand_bbt_read_oob - [MTD Interface] OneNAND read out-of-band for bbt scan
1524  * @param mtd           MTD device structure
1525  * @param from          offset to read from
1526  * @param ops           oob operation description structure
1527  *
1528  * OneNAND read out-of-band data from the spare area for bbt scan
1529  */
1530 int onenand_bbt_read_oob(struct mtd_info *mtd, loff_t from,
1531                             struct mtd_oob_ops *ops)
1532 {
1533         struct onenand_chip *this = mtd->priv;
1534         int read = 0, thislen, column;
1535         int ret = 0, readcmd;
1536         size_t len = ops->ooblen;
1537         u_char *buf = ops->oobbuf;
1538
1539         DEBUG(MTD_DEBUG_LEVEL3, "%s: from = 0x%08x, len = %zi\n",
1540                 __func__, (unsigned int) from, len);
1541
1542         /* Initialize return value */
1543         ops->oobretlen = 0;
1544
1545         /* Do not allow reads past end of device */
1546         if (unlikely((from + len) > mtd->size)) {
1547                 printk(KERN_ERR "%s: Attempt read beyond end of device\n",
1548                         __func__);
1549                 return ONENAND_BBT_READ_FATAL_ERROR;
1550         }
1551
1552         /* Grab the lock and see if the device is available */
1553         onenand_get_device(mtd, FL_READING);
1554
1555         column = from & (mtd->oobsize - 1);
1556
1557         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1558
1559         while (read < len) {
1560                 cond_resched();
1561
1562                 thislen = mtd->oobsize - column;
1563                 thislen = min_t(int, thislen, len);
1564
1565                 this->command(mtd, readcmd, from, mtd->oobsize);
1566
1567                 onenand_update_bufferram(mtd, from, 0);
1568
1569                 ret = this->bbt_wait(mtd, FL_READING);
1570                 if (unlikely(ret))
1571                         ret = onenand_recover_lsb(mtd, from, ret);
1572
1573                 if (ret)
1574                         break;
1575
1576                 this->read_bufferram(mtd, ONENAND_SPARERAM, buf, column, thislen);
1577                 read += thislen;
1578                 if (read == len)
1579                         break;
1580
1581                 buf += thislen;
1582
1583                 /* Read more? */
1584                 if (read < len) {
1585                         /* Update Page size */
1586                         from += this->writesize;
1587                         column = 0;
1588                 }
1589         }
1590
1591         /* Deselect and wake up anyone waiting on the device */
1592         onenand_release_device(mtd);
1593
1594         ops->oobretlen = read;
1595         return ret;
1596 }
1597
1598 #ifdef CONFIG_MTD_ONENAND_VERIFY_WRITE
1599 /**
1600  * onenand_verify_oob - [GENERIC] verify the oob contents after a write
1601  * @param mtd           MTD device structure
1602  * @param buf           the databuffer to verify
1603  * @param to            offset to read from
1604  */
1605 static int onenand_verify_oob(struct mtd_info *mtd, const u_char *buf, loff_t to)
1606 {
1607         struct onenand_chip *this = mtd->priv;
1608         u_char *oob_buf = this->oob_buf;
1609         int status, i, readcmd;
1610
1611         readcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_READ : ONENAND_CMD_READOOB;
1612
1613         this->command(mtd, readcmd, to, mtd->oobsize);
1614         onenand_update_bufferram(mtd, to, 0);
1615         status = this->wait(mtd, FL_READING);
1616         if (status)
1617                 return status;
1618
1619         this->read_bufferram(mtd, ONENAND_SPARERAM, oob_buf, 0, mtd->oobsize);
1620         for (i = 0; i < mtd->oobsize; i++)
1621                 if (buf[i] != 0xFF && buf[i] != oob_buf[i])
1622                         return -EBADMSG;
1623
1624         return 0;
1625 }
1626
1627 /**
1628  * onenand_verify - [GENERIC] verify the chip contents after a write
1629  * @param mtd          MTD device structure
1630  * @param buf          the databuffer to verify
1631  * @param addr         offset to read from
1632  * @param len          number of bytes to read and compare
1633  */
1634 static int onenand_verify(struct mtd_info *mtd, const u_char *buf, loff_t addr, size_t len)
1635 {
1636         struct onenand_chip *this = mtd->priv;
1637         void __iomem *dataram;
1638         int ret = 0;
1639         int thislen, column;
1640
1641         while (len != 0) {
1642                 thislen = min_t(int, this->writesize, len);
1643                 column = addr & (this->writesize - 1);
1644                 if (column + thislen > this->writesize)
1645                         thislen = this->writesize - column;
1646
1647                 this->command(mtd, ONENAND_CMD_READ, addr, this->writesize);
1648
1649                 onenand_update_bufferram(mtd, addr, 0);
1650
1651                 ret = this->wait(mtd, FL_READING);
1652                 if (ret)
1653                         return ret;
1654
1655                 onenand_update_bufferram(mtd, addr, 1);
1656
1657                 dataram = this->base + ONENAND_DATARAM;
1658                 dataram += onenand_bufferram_offset(mtd, ONENAND_DATARAM);
1659
1660                 if (memcmp(buf, dataram + column, thislen))
1661                         return -EBADMSG;
1662
1663                 len -= thislen;
1664                 buf += thislen;
1665                 addr += thislen;
1666         }
1667
1668         return 0;
1669 }
1670 #else
1671 #define onenand_verify(...)             (0)
1672 #define onenand_verify_oob(...)         (0)
1673 #endif
1674
1675 #define NOTALIGNED(x)   ((x & (this->subpagesize - 1)) != 0)
1676
1677 static void onenand_panic_wait(struct mtd_info *mtd)
1678 {
1679         struct onenand_chip *this = mtd->priv;
1680         unsigned int interrupt;
1681         int i;
1682
1683         for (i = 0; i < 2000; i++) {
1684                 interrupt = this->read_word(this->base + ONENAND_REG_INTERRUPT);
1685                 if (interrupt & ONENAND_INT_MASTER)
1686                         break;
1687                 udelay(10);
1688         }
1689 }
1690
1691 /**
1692  * onenand_panic_write - [MTD Interface] write buffer to FLASH in a panic context
1693  * @param mtd           MTD device structure
1694  * @param to            offset to write to
1695  * @param len           number of bytes to write
1696  * @param retlen        pointer to variable to store the number of written bytes
1697  * @param buf           the data to write
1698  *
1699  * Write with ECC
1700  */
1701 static int onenand_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
1702                          size_t *retlen, const u_char *buf)
1703 {
1704         struct onenand_chip *this = mtd->priv;
1705         int column, subpage;
1706         int written = 0;
1707         int ret = 0;
1708
1709         if (this->state == FL_PM_SUSPENDED)
1710                 return -EBUSY;
1711
1712         /* Wait for any existing operation to clear */
1713         onenand_panic_wait(mtd);
1714
1715         DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n",
1716                 __func__, (unsigned int) to, (int) len);
1717
1718         /* Initialize retlen, in case of early exit */
1719         *retlen = 0;
1720
1721         /* Do not allow writes past end of device */
1722         if (unlikely((to + len) > mtd->size)) {
1723                 printk(KERN_ERR "%s: Attempt write to past end of device\n",
1724                         __func__);
1725                 return -EINVAL;
1726         }
1727
1728         /* Reject writes, which are not page aligned */
1729         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1730                 printk(KERN_ERR "%s: Attempt to write not page aligned data\n",
1731                         __func__);
1732                 return -EINVAL;
1733         }
1734
1735         column = to & (mtd->writesize - 1);
1736
1737         /* Loop until all data write */
1738         while (written < len) {
1739                 int thislen = min_t(int, mtd->writesize - column, len - written);
1740                 u_char *wbuf = (u_char *) buf;
1741
1742                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1743
1744                 /* Partial page write */
1745                 subpage = thislen < mtd->writesize;
1746                 if (subpage) {
1747                         memset(this->page_buf, 0xff, mtd->writesize);
1748                         memcpy(this->page_buf + column, buf, thislen);
1749                         wbuf = this->page_buf;
1750                 }
1751
1752                 this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1753                 this->write_bufferram(mtd, ONENAND_SPARERAM, ffchars, 0, mtd->oobsize);
1754
1755                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1756
1757                 onenand_panic_wait(mtd);
1758
1759                 /* In partial page write we don't update bufferram */
1760                 onenand_update_bufferram(mtd, to, !ret && !subpage);
1761                 if (ONENAND_IS_2PLANE(this)) {
1762                         ONENAND_SET_BUFFERRAM1(this);
1763                         onenand_update_bufferram(mtd, to + this->writesize, !ret && !subpage);
1764                 }
1765
1766                 if (ret) {
1767                         printk(KERN_ERR "%s: write failed %d\n", __func__, ret);
1768                         break;
1769                 }
1770
1771                 written += thislen;
1772
1773                 if (written == len)
1774                         break;
1775
1776                 column = 0;
1777                 to += thislen;
1778                 buf += thislen;
1779         }
1780
1781         *retlen = written;
1782         return ret;
1783 }
1784
1785 /**
1786  * onenand_fill_auto_oob - [Internal] oob auto-placement transfer
1787  * @param mtd           MTD device structure
1788  * @param oob_buf       oob buffer
1789  * @param buf           source address
1790  * @param column        oob offset to write to
1791  * @param thislen       oob length to write
1792  */
1793 static int onenand_fill_auto_oob(struct mtd_info *mtd, u_char *oob_buf,
1794                                   const u_char *buf, int column, int thislen)
1795 {
1796         struct onenand_chip *this = mtd->priv;
1797         struct nand_oobfree *free;
1798         int writecol = column;
1799         int writeend = column + thislen;
1800         int lastgap = 0;
1801         unsigned int i;
1802
1803         free = this->ecclayout->oobfree;
1804         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1805                 if (writecol >= lastgap)
1806                         writecol += free->offset - lastgap;
1807                 if (writeend >= lastgap)
1808                         writeend += free->offset - lastgap;
1809                 lastgap = free->offset + free->length;
1810         }
1811         free = this->ecclayout->oobfree;
1812         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES && free->length; i++, free++) {
1813                 int free_end = free->offset + free->length;
1814                 if (free->offset < writeend && free_end > writecol) {
1815                         int st = max_t(int,free->offset,writecol);
1816                         int ed = min_t(int,free_end,writeend);
1817                         int n = ed - st;
1818                         memcpy(oob_buf + st, buf, n);
1819                         buf += n;
1820                 } else if (column == 0)
1821                         break;
1822         }
1823         return 0;
1824 }
1825
1826 /**
1827  * onenand_write_ops_nolock - [OneNAND Interface] write main and/or out-of-band
1828  * @param mtd           MTD device structure
1829  * @param to            offset to write to
1830  * @param ops           oob operation description structure
1831  *
1832  * Write main and/or oob with ECC
1833  */
1834 static int onenand_write_ops_nolock(struct mtd_info *mtd, loff_t to,
1835                                 struct mtd_oob_ops *ops)
1836 {
1837         struct onenand_chip *this = mtd->priv;
1838         int written = 0, column, thislen = 0, subpage = 0;
1839         int prev = 0, prevlen = 0, prev_subpage = 0, first = 1;
1840         int oobwritten = 0, oobcolumn, thisooblen, oobsize;
1841         size_t len = ops->len;
1842         size_t ooblen = ops->ooblen;
1843         const u_char *buf = ops->datbuf;
1844         const u_char *oob = ops->oobbuf;
1845         u_char *oobbuf;
1846         int ret = 0;
1847
1848         DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n",
1849                 __func__, (unsigned int) to, (int) len);
1850
1851         /* Initialize retlen, in case of early exit */
1852         ops->retlen = 0;
1853         ops->oobretlen = 0;
1854
1855         /* Do not allow writes past end of device */
1856         if (unlikely((to + len) > mtd->size)) {
1857                 printk(KERN_ERR "%s: Attempt write to past end of device\n",
1858                         __func__);
1859                 return -EINVAL;
1860         }
1861
1862         /* Reject writes, which are not page aligned */
1863         if (unlikely(NOTALIGNED(to) || NOTALIGNED(len))) {
1864                 printk(KERN_ERR "%s: Attempt to write not page aligned data\n",
1865                         __func__);
1866                 return -EINVAL;
1867         }
1868
1869         /* Check zero length */
1870         if (!len)
1871                 return 0;
1872
1873         if (ops->mode == MTD_OOB_AUTO)
1874                 oobsize = this->ecclayout->oobavail;
1875         else
1876                 oobsize = mtd->oobsize;
1877
1878         oobcolumn = to & (mtd->oobsize - 1);
1879
1880         column = to & (mtd->writesize - 1);
1881
1882         /* Loop until all data write */
1883         while (1) {
1884                 if (written < len) {
1885                         u_char *wbuf = (u_char *) buf;
1886
1887                         thislen = min_t(int, mtd->writesize - column, len - written);
1888                         thisooblen = min_t(int, oobsize - oobcolumn, ooblen - oobwritten);
1889
1890                         cond_resched();
1891
1892                         this->command(mtd, ONENAND_CMD_BUFFERRAM, to, thislen);
1893
1894                         /* Partial page write */
1895                         subpage = thislen < mtd->writesize;
1896                         if (subpage) {
1897                                 memset(this->page_buf, 0xff, mtd->writesize);
1898                                 memcpy(this->page_buf + column, buf, thislen);
1899                                 wbuf = this->page_buf;
1900                         }
1901
1902                         this->write_bufferram(mtd, ONENAND_DATARAM, wbuf, 0, mtd->writesize);
1903
1904                         if (oob) {
1905                                 oobbuf = this->oob_buf;
1906
1907                                 /* We send data to spare ram with oobsize
1908                                  * to prevent byte access */
1909                                 memset(oobbuf, 0xff, mtd->oobsize);
1910                                 if (ops->mode == MTD_OOB_AUTO)
1911                                         onenand_fill_auto_oob(mtd, oobbuf, oob, oobcolumn, thisooblen);
1912                                 else
1913                                         memcpy(oobbuf + oobcolumn, oob, thisooblen);
1914
1915                                 oobwritten += thisooblen;
1916                                 oob += thisooblen;
1917                                 oobcolumn = 0;
1918                         } else
1919                                 oobbuf = (u_char *) ffchars;
1920
1921                         this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
1922                 } else
1923                         ONENAND_SET_NEXT_BUFFERRAM(this);
1924
1925                 /*
1926                  * 2 PLANE, MLC, and Flex-OneNAND do not support
1927                  * write-while-program feature.
1928                  */
1929                 if (!ONENAND_IS_2PLANE(this) && !first) {
1930                         ONENAND_SET_PREV_BUFFERRAM(this);
1931
1932                         ret = this->wait(mtd, FL_WRITING);
1933
1934                         /* In partial page write we don't update bufferram */
1935                         onenand_update_bufferram(mtd, prev, !ret && !prev_subpage);
1936                         if (ret) {
1937                                 written -= prevlen;
1938                                 printk(KERN_ERR "%s: write failed %d\n",
1939                                         __func__, ret);
1940                                 break;
1941                         }
1942
1943                         if (written == len) {
1944                                 /* Only check verify write turn on */
1945                                 ret = onenand_verify(mtd, buf - len, to - len, len);
1946                                 if (ret)
1947                                         printk(KERN_ERR "%s: verify failed %d\n",
1948                                                 __func__, ret);
1949                                 break;
1950                         }
1951
1952                         ONENAND_SET_NEXT_BUFFERRAM(this);
1953                 }
1954
1955                 this->command(mtd, ONENAND_CMD_PROG, to, mtd->writesize);
1956
1957                 /*
1958                  * 2 PLANE, MLC, and Flex-OneNAND wait here
1959                  */
1960                 if (ONENAND_IS_2PLANE(this)) {
1961                         ret = this->wait(mtd, FL_WRITING);
1962
1963                         /* In partial page write we don't update bufferram */
1964                         onenand_update_bufferram(mtd, to, !ret && !subpage);
1965                         if (ret) {
1966                                 printk(KERN_ERR "%s: write failed %d\n",
1967                                         __func__, ret);
1968                                 break;
1969                         }
1970
1971                         /* Only check verify write turn on */
1972                         ret = onenand_verify(mtd, buf, to, thislen);
1973                         if (ret) {
1974                                 printk(KERN_ERR "%s: verify failed %d\n",
1975                                         __func__, ret);
1976                                 break;
1977                         }
1978
1979                         written += thislen;
1980
1981                         if (written == len)
1982                                 break;
1983
1984                 } else
1985                         written += thislen;
1986
1987                 column = 0;
1988                 prev_subpage = subpage;
1989                 prev = to;
1990                 prevlen = thislen;
1991                 to += thislen;
1992                 buf += thislen;
1993                 first = 0;
1994         }
1995
1996         /* In error case, clear all bufferrams */
1997         if (written != len)
1998                 onenand_invalidate_bufferram(mtd, 0, -1);
1999
2000         ops->retlen = written;
2001         ops->oobretlen = oobwritten;
2002
2003         return ret;
2004 }
2005
2006
2007 /**
2008  * onenand_write_oob_nolock - [Internal] OneNAND write out-of-band
2009  * @param mtd           MTD device structure
2010  * @param to            offset to write to
2011  * @param len           number of bytes to write
2012  * @param retlen        pointer to variable to store the number of written bytes
2013  * @param buf           the data to write
2014  * @param mode          operation mode
2015  *
2016  * OneNAND write out-of-band
2017  */
2018 static int onenand_write_oob_nolock(struct mtd_info *mtd, loff_t to,
2019                                     struct mtd_oob_ops *ops)
2020 {
2021         struct onenand_chip *this = mtd->priv;
2022         int column, ret = 0, oobsize;
2023         int written = 0, oobcmd;
2024         u_char *oobbuf;
2025         size_t len = ops->ooblen;
2026         const u_char *buf = ops->oobbuf;
2027         mtd_oob_mode_t mode = ops->mode;
2028
2029         to += ops->ooboffs;
2030
2031         DEBUG(MTD_DEBUG_LEVEL3, "%s: to = 0x%08x, len = %i\n",
2032                 __func__, (unsigned int) to, (int) len);
2033
2034         /* Initialize retlen, in case of early exit */
2035         ops->oobretlen = 0;
2036
2037         if (mode == MTD_OOB_AUTO)
2038                 oobsize = this->ecclayout->oobavail;
2039         else
2040                 oobsize = mtd->oobsize;
2041
2042         column = to & (mtd->oobsize - 1);
2043
2044         if (unlikely(column >= oobsize)) {
2045                 printk(KERN_ERR "%s: Attempted to start write outside oob\n",
2046                         __func__);
2047                 return -EINVAL;
2048         }
2049
2050         /* For compatibility with NAND: Do not allow write past end of page */
2051         if (unlikely(column + len > oobsize)) {
2052                 printk(KERN_ERR "%s: Attempt to write past end of page\n",
2053                         __func__);
2054                 return -EINVAL;
2055         }
2056
2057         /* Do not allow reads past end of device */
2058         if (unlikely(to >= mtd->size ||
2059                      column + len > ((mtd->size >> this->page_shift) -
2060                                      (to >> this->page_shift)) * oobsize)) {
2061                 printk(KERN_ERR "%s: Attempted to write past end of device\n",
2062                        __func__);
2063                 return -EINVAL;
2064         }
2065
2066         oobbuf = this->oob_buf;
2067
2068         oobcmd = ONENAND_IS_MLC(this) ? ONENAND_CMD_PROG : ONENAND_CMD_PROGOOB;
2069
2070         /* Loop until all data write */
2071         while (written < len) {
2072                 int thislen = min_t(int, oobsize, len - written);
2073
2074                 cond_resched();
2075
2076                 this->command(mtd, ONENAND_CMD_BUFFERRAM, to, mtd->oobsize);
2077
2078                 /* We send data to spare ram with oobsize
2079                  * to prevent byte access */
2080                 memset(oobbuf, 0xff, mtd->oobsize);
2081                 if (mode == MTD_OOB_AUTO)
2082                         onenand_fill_auto_oob(mtd, oobbuf, buf, column, thislen);
2083                 else
2084                         memcpy(oobbuf + column, buf, thislen);
2085                 this->write_bufferram(mtd, ONENAND_SPARERAM, oobbuf, 0, mtd->oobsize);
2086
2087                 if (ONENAND_IS_MLC(this)) {
2088                         /* Set main area of DataRAM to 0xff*/
2089                         memset(this->page_buf, 0xff, mtd->writesize);
2090                         this->write_bufferram(mtd, ONENAND_DATARAM,
2091                                          this->page_buf, 0, mtd->writesize);
2092                 }
2093
2094                 this->command(mtd, oobcmd, to, mtd->oobsize);
2095
2096                 onenand_update_bufferram(mtd, to, 0);
2097                 if (ONENAND_IS_2PLANE(this)) {
2098                         ONENAND_SET_BUFFERRAM1(this);
2099                         onenand_update_bufferram(mtd, to + this->writesize, 0);
2100                 }
2101
2102                 ret = this->wait(mtd, FL_WRITING);
2103                 if (ret) {
2104                         printk(KERN_ERR "%s: write failed %d\n", __func__, ret);
2105                         break;
2106                 }
2107
2108                 ret = onenand_verify_oob(mtd, oobbuf, to);
2109                 if (ret) {
2110                         printk(KERN_ERR "%s: verify failed %d\n",
2111                                 __func__, ret);
2112                         break;
2113                 }
2114
2115                 written += thislen;
2116                 if (written == len)
2117                         break;
2118
2119                 to += mtd->writesize;
2120                 buf += thislen;
2121                 column = 0;
2122         }
2123
2124         ops->oobretlen = written;
2125
2126         return ret;
2127 }
2128
2129 /**
2130  * onenand_write - [MTD Interface] write buffer to FLASH
2131  * @param mtd           MTD device structure
2132  * @param to            offset to write to
2133  * @param len           number of bytes to write
2134  * @param retlen        pointer to variable to store the number of written bytes
2135  * @param buf           the data to write
2136  *
2137  * Write with ECC
2138  */
2139 static int onenand_write(struct mtd_info *mtd, loff_t to, size_t len,
2140         size_t *retlen, const u_char *buf)
2141 {
2142         struct mtd_oob_ops ops = {
2143                 .len    = len,
2144                 .ooblen = 0,
2145                 .datbuf = (u_char *) buf,
2146                 .oobbuf = NULL,
2147         };
2148         int ret;
2149
2150         onenand_get_device(mtd, FL_WRITING);
2151         ret = onenand_write_ops_nolock(mtd, to, &ops);
2152         onenand_release_device(mtd);
2153
2154         *retlen = ops.retlen;
2155         return ret;
2156 }
2157
2158 /**
2159  * onenand_write_oob - [MTD Interface] NAND write data and/or out-of-band
2160  * @param mtd:          MTD device structure
2161  * @param to:           offset to write
2162  * @param ops:          oob operation description structure
2163  */
2164 static int onenand_write_oob(struct mtd_info *mtd, loff_t to,
2165                              struct mtd_oob_ops *ops)
2166 {
2167         int ret;
2168
2169         switch (ops->mode) {
2170         case MTD_OOB_PLACE:
2171         case MTD_OOB_AUTO:
2172                 break;
2173         case MTD_OOB_RAW:
2174                 /* Not implemented yet */
2175         default:
2176                 return -EINVAL;
2177         }
2178
2179         onenand_get_device(mtd, FL_WRITING);
2180         if (ops->datbuf)
2181                 ret = onenand_write_ops_nolock(mtd, to, ops);
2182         else
2183                 ret = onenand_write_oob_nolock(mtd, to, ops);
2184         onenand_release_device(mtd);
2185
2186         return ret;
2187 }
2188
2189 /**
2190  * onenand_block_isbad_nolock - [GENERIC] Check if a block is marked bad
2191  * @param mtd           MTD device structure
2192  * @param ofs           offset from device start
2193  * @param allowbbt      1, if its allowed to access the bbt area
2194  *
2195  * Check, if the block is bad. Either by reading the bad block table or
2196  * calling of the scan function.
2197  */
2198 static int onenand_block_isbad_nolock(struct mtd_info *mtd, loff_t ofs, int allowbbt)
2199 {
2200         struct onenand_chip *this = mtd->priv;
2201         struct bbm_info *bbm = this->bbm;
2202
2203         /* Return info from the table */
2204         return bbm->isbad_bbt(mtd, ofs, allowbbt);
2205 }
2206
2207
2208 static int onenand_multiblock_erase_verify(struct mtd_info *mtd,
2209                                            struct erase_info *instr)
2210 {
2211         struct onenand_chip *this = mtd->priv;
2212         loff_t addr = instr->addr;
2213         int len = instr->len;
2214         unsigned int block_size = (1 << this->erase_shift);
2215         int ret = 0;
2216
2217         while (len) {
2218                 this->command(mtd, ONENAND_CMD_ERASE_VERIFY, addr, block_size);
2219                 ret = this->wait(mtd, FL_VERIFYING_ERASE);
2220                 if (ret) {
2221                         printk(KERN_ERR "%s: Failed verify, block %d\n",
2222                                __func__, onenand_block(this, addr));
2223                         instr->state = MTD_ERASE_FAILED;
2224                         instr->fail_addr = addr;
2225                         return -1;
2226                 }
2227                 len -= block_size;
2228                 addr += block_size;
2229         }
2230         return 0;
2231 }
2232
2233 /**
2234  * onenand_multiblock_erase - [Internal] erase block(s) using multiblock erase
2235  * @param mtd           MTD device structure
2236  * @param instr         erase instruction
2237  * @param region        erase region
2238  *
2239  * Erase one or more blocks up to 64 block at a time
2240  */
2241 static int onenand_multiblock_erase(struct mtd_info *mtd,
2242                                     struct erase_info *instr,
2243                                     unsigned int block_size)
2244 {
2245         struct onenand_chip *this = mtd->priv;
2246         loff_t addr = instr->addr;
2247         int len = instr->len;
2248         int eb_count = 0;
2249         int ret = 0;
2250         int bdry_block = 0;
2251
2252         instr->state = MTD_ERASING;
2253
2254         if (ONENAND_IS_DDP(this)) {
2255                 loff_t bdry_addr = this->chipsize >> 1;
2256                 if (addr < bdry_addr && (addr + len) > bdry_addr)
2257                         bdry_block = bdry_addr >> this->erase_shift;
2258         }
2259
2260         /* Pre-check bbs */
2261         while (len) {
2262                 /* Check if we have a bad block, we do not erase bad blocks */
2263                 if (onenand_block_isbad_nolock(mtd, addr, 0)) {
2264                         printk(KERN_WARNING "%s: attempt to erase a bad block "
2265                                "at addr 0x%012llx\n",
2266                                __func__, (unsigned long long) addr);
2267                         instr->state = MTD_ERASE_FAILED;
2268                         return -EIO;
2269                 }
2270                 len -= block_size;
2271                 addr += block_size;
2272         }
2273
2274         len = instr->len;
2275         addr = instr->addr;
2276
2277         /* loop over 64 eb batches */
2278         while (len) {
2279                 struct erase_info verify_instr = *instr;
2280                 int max_eb_count = MB_ERASE_MAX_BLK_COUNT;
2281
2282                 verify_instr.addr = addr;
2283                 verify_instr.len = 0;
2284
2285                 /* do not cross chip boundary */
2286                 if (bdry_block) {
2287                         int this_block = (addr >> this->erase_shift);
2288
2289                         if (this_block < bdry_block) {
2290                                 max_eb_count = min(max_eb_count,
2291                                                    (bdry_block - this_block));
2292                         }
2293                 }
2294
2295                 eb_count = 0;
2296
2297                 while (len > block_size && eb_count < (max_eb_count - 1)) {
2298                         this->command(mtd, ONENAND_CMD_MULTIBLOCK_ERASE,
2299                                       addr, block_size);
2300                         onenand_invalidate_bufferram(mtd, addr, block_size);
2301
2302                         ret = this->wait(mtd, FL_PREPARING_ERASE);
2303                         if (ret) {
2304                                 printk(KERN_ERR "%s: Failed multiblock erase, "
2305                                        "block %d\n", __func__,
2306                                        onenand_block(this, addr));
2307                                 instr->state = MTD_ERASE_FAILED;
2308                                 instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
2309                                 return -EIO;
2310                         }
2311
2312                         len -= block_size;
2313                         addr += block_size;
2314                         eb_count++;
2315                 }
2316
2317                 /* last block of 64-eb series */
2318                 cond_resched();
2319                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
2320                 onenand_invalidate_bufferram(mtd, addr, block_size);
2321
2322                 ret = this->wait(mtd, FL_ERASING);
2323                 /* Check if it is write protected */
2324                 if (ret) {
2325                         printk(KERN_ERR "%s: Failed erase, block %d\n",
2326                                __func__, onenand_block(this, addr));
2327                         instr->state = MTD_ERASE_FAILED;
2328                         instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
2329                         return -EIO;
2330                 }
2331
2332                 len -= block_size;
2333                 addr += block_size;
2334                 eb_count++;
2335
2336                 /* verify */
2337                 verify_instr.len = eb_count * block_size;
2338                 if (onenand_multiblock_erase_verify(mtd, &verify_instr)) {
2339                         instr->state = verify_instr.state;
2340                         instr->fail_addr = verify_instr.fail_addr;
2341                         return -EIO;
2342                 }
2343
2344         }
2345         return 0;
2346 }
2347
2348
2349 /**
2350  * onenand_block_by_block_erase - [Internal] erase block(s) using regular erase
2351  * @param mtd           MTD device structure
2352  * @param instr         erase instruction
2353  * @param region        erase region
2354  * @param block_size    erase block size
2355  *
2356  * Erase one or more blocks one block at a time
2357  */
2358 static int onenand_block_by_block_erase(struct mtd_info *mtd,
2359                                         struct erase_info *instr,
2360                                         struct mtd_erase_region_info *region,
2361                                         unsigned int block_size)
2362 {
2363         struct onenand_chip *this = mtd->priv;
2364         loff_t addr = instr->addr;
2365         int len = instr->len;
2366         loff_t region_end = 0;
2367         int ret = 0;
2368
2369         if (region) {
2370                 /* region is set for Flex-OneNAND */
2371                 region_end = region->offset + region->erasesize * region->numblocks;
2372         }
2373
2374         instr->state = MTD_ERASING;
2375
2376         /* Loop through the blocks */
2377         while (len) {
2378                 cond_resched();
2379
2380                 /* Check if we have a bad block, we do not erase bad blocks */
2381                 if (onenand_block_isbad_nolock(mtd, addr, 0)) {
2382                         printk(KERN_WARNING "%s: attempt to erase a bad block "
2383                                         "at addr 0x%012llx\n",
2384                                         __func__, (unsigned long long) addr);
2385                         instr->state = MTD_ERASE_FAILED;
2386                         return -EIO;
2387                 }
2388
2389                 this->command(mtd, ONENAND_CMD_ERASE, addr, block_size);
2390
2391                 onenand_invalidate_bufferram(mtd, addr, block_size);
2392
2393                 ret = this->wait(mtd, FL_ERASING);
2394                 /* Check, if it is write protected */
2395                 if (ret) {
2396                         printk(KERN_ERR "%s: Failed erase, block %d\n",
2397                                 __func__, onenand_block(this, addr));
2398                         instr->state = MTD_ERASE_FAILED;
2399                         instr->fail_addr = addr;
2400                         return -EIO;
2401                 }
2402
2403                 len -= block_size;
2404                 addr += block_size;
2405
2406                 if (addr == region_end) {
2407                         if (!len)
2408                                 break;
2409                         region++;
2410
2411                         block_size = region->erasesize;
2412                         region_end = region->offset + region->erasesize * region->numblocks;
2413
2414                         if (len & (block_size - 1)) {
2415                                 /* FIXME: This should be handled at MTD partitioning level. */
2416                                 printk(KERN_ERR "%s: Unaligned address\n",
2417                                         __func__);
2418                                 return -EIO;
2419                         }
2420                 }
2421         }
2422         return 0;
2423 }
2424
2425 /**
2426  * onenand_erase - [MTD Interface] erase block(s)
2427  * @param mtd           MTD device structure
2428  * @param instr         erase instruction
2429  *
2430  * Erase one or more blocks
2431  */
2432 static int onenand_erase(struct mtd_info *mtd, struct erase_info *instr)
2433 {
2434         struct onenand_chip *this = mtd->priv;
2435         unsigned int block_size;
2436         loff_t addr = instr->addr;
2437         loff_t len = instr->len;
2438         int ret = 0;
2439         struct mtd_erase_region_info *region = NULL;
2440         loff_t region_offset = 0;
2441
2442         DEBUG(MTD_DEBUG_LEVEL3, "%s: start=0x%012llx, len=%llu\n", __func__,
2443               (unsigned long long) instr->addr, (unsigned long long) instr->len);
2444
2445         /* Do not allow erase past end of device */
2446         if (unlikely((len + addr) > mtd->size)) {
2447                 printk(KERN_ERR "%s: Erase past end of device\n", __func__);
2448                 return -EINVAL;
2449         }
2450
2451         if (FLEXONENAND(this)) {
2452                 /* Find the eraseregion of this address */
2453                 int i = flexonenand_region(mtd, addr);
2454
2455                 region = &mtd->eraseregions[i];
2456                 block_size = region->erasesize;
2457
2458                 /* Start address within region must align on block boundary.
2459                  * Erase region's start offset is always block start address.
2460                  */
2461                 region_offset = region->offset;
2462         } else
2463                 block_size = 1 << this->erase_shift;
2464
2465         /* Start address must align on block boundary */
2466         if (unlikely((addr - region_offset) & (block_size - 1))) {
2467                 printk(KERN_ERR "%s: Unaligned address\n", __func__);
2468                 return -EINVAL;
2469         }
2470
2471         /* Length must align on block boundary */
2472         if (unlikely(len & (block_size - 1))) {
2473                 printk(KERN_ERR "%s: Length not block aligned\n", __func__);
2474                 return -EINVAL;
2475         }
2476
2477         instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
2478
2479         /* Grab the lock and see if the device is available */
2480         onenand_get_device(mtd, FL_ERASING);
2481
2482         if (region || instr->len < MB_ERASE_MIN_BLK_COUNT * block_size) {
2483                 /* region is set for Flex-OneNAND (no mb erase) */
2484                 ret = onenand_block_by_block_erase(mtd, instr,
2485                                                    region, block_size);
2486         } else {
2487                 ret = onenand_multiblock_erase(mtd, instr, block_size);
2488         }
2489
2490         /* Deselect and wake up anyone waiting on the device */
2491         onenand_release_device(mtd);
2492
2493         /* Do call back function */
2494         if (!ret) {
2495                 instr->state = MTD_ERASE_DONE;
2496                 mtd_erase_callback(instr);
2497         }
2498
2499         return ret;
2500 }
2501
2502 /**
2503  * onenand_sync - [MTD Interface] sync
2504  * @param mtd           MTD device structure
2505  *
2506  * Sync is actually a wait for chip ready function
2507  */
2508 static void onenand_sync(struct mtd_info *mtd)
2509 {
2510         DEBUG(MTD_DEBUG_LEVEL3, "%s: called\n", __func__);
2511
2512         /* Grab the lock and see if the device is available */
2513         onenand_get_device(mtd, FL_SYNCING);
2514
2515         /* Release it and go back */
2516         onenand_release_device(mtd);
2517 }
2518
2519 /**
2520  * onenand_block_isbad - [MTD Interface] Check whether the block at the given offset is bad
2521  * @param mtd           MTD device structure
2522  * @param ofs           offset relative to mtd start
2523  *
2524  * Check whether the block is bad
2525  */
2526 static int onenand_block_isbad(struct mtd_info *mtd, loff_t ofs)
2527 {
2528         int ret;
2529
2530         /* Check for invalid offset */
2531         if (ofs > mtd->size)
2532                 return -EINVAL;
2533
2534         onenand_get_device(mtd, FL_READING);
2535         ret = onenand_block_isbad_nolock(mtd, ofs, 0);
2536         onenand_release_device(mtd);
2537         return ret;
2538 }
2539
2540 /**
2541  * onenand_default_block_markbad - [DEFAULT] mark a block bad
2542  * @param mtd           MTD device structure
2543  * @param ofs           offset from device start
2544  *
2545  * This is the default implementation, which can be overridden by
2546  * a hardware specific driver.
2547  */
2548 static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
2549 {
2550         struct onenand_chip *this = mtd->priv;
2551         struct bbm_info *bbm = this->bbm;
2552         u_char buf[2] = {0, 0};
2553         struct mtd_oob_ops ops = {
2554                 .mode = MTD_OOB_PLACE,
2555                 .ooblen = 2,
2556                 .oobbuf = buf,
2557                 .ooboffs = 0,
2558         };
2559         int block;
2560
2561         /* Get block number */
2562         block = onenand_block(this, ofs);
2563         if (bbm->bbt)
2564                 bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
2565
2566         /* We write two bytes, so we don't have to mess with 16-bit access */
2567         ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
2568         /* FIXME : What to do when marking SLC block in partition
2569          *         with MLC erasesize? For now, it is not advisable to
2570          *         create partitions containing both SLC and MLC regions.
2571          */
2572         return onenand_write_oob_nolock(mtd, ofs, &ops);
2573 }
2574
2575 /**
2576  * onenand_block_markbad - [MTD Interface] Mark the block at the given offset as bad
2577  * @param mtd           MTD device structure
2578  * @param ofs           offset relative to mtd start
2579  *
2580  * Mark the block as bad
2581  */
2582 static int onenand_block_markbad(struct mtd_info *mtd, loff_t ofs)
2583 {
2584         struct onenand_chip *this = mtd->priv;
2585         int ret;
2586
2587         ret = onenand_block_isbad(mtd, ofs);
2588         if (ret) {
2589                 /* If it was bad already, return success and do nothing */
2590                 if (ret > 0)
2591                         return 0;
2592                 return ret;
2593         }
2594
2595         onenand_get_device(mtd, FL_WRITING);
2596         ret = this->block_markbad(mtd, ofs);
2597         onenand_release_device(mtd);
2598         return ret;
2599 }
2600
2601 /**
2602  * onenand_do_lock_cmd - [OneNAND Interface] Lock or unlock block(s)
2603  * @param mtd           MTD device structure
2604  * @param ofs           offset relative to mtd start
2605  * @param len           number of bytes to lock or unlock
2606  * @param cmd           lock or unlock command
2607  *
2608  * Lock or unlock one or more blocks
2609  */
2610 static int onenand_do_lock_cmd(struct mtd_info *mtd, loff_t ofs, size_t len, int cmd)
2611 {
2612         struct onenand_chip *this = mtd->priv;
2613         int start, end, block, value, status;
2614         int wp_status_mask;
2615
2616         start = onenand_block(this, ofs);
2617         end = onenand_block(this, ofs + len) - 1;
2618
2619         if (cmd == ONENAND_CMD_LOCK)
2620                 wp_status_mask = ONENAND_WP_LS;
2621         else
2622                 wp_status_mask = ONENAND_WP_US;
2623
2624         /* Continuous lock scheme */
2625         if (this->options & ONENAND_HAS_CONT_LOCK) {
2626                 /* Set start block address */
2627                 this->write_word(start, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2628                 /* Set end block address */
2629                 this->write_word(end, this->base +  ONENAND_REG_END_BLOCK_ADDRESS);
2630                 /* Write lock command */
2631                 this->command(mtd, cmd, 0, 0);
2632
2633                 /* There's no return value */
2634                 this->wait(mtd, FL_LOCKING);
2635
2636                 /* Sanity check */
2637                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2638                     & ONENAND_CTRL_ONGO)
2639                         continue;
2640
2641                 /* Check lock status */
2642                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2643                 if (!(status & wp_status_mask))
2644                         printk(KERN_ERR "%s: wp status = 0x%x\n",
2645                                 __func__, status);
2646
2647                 return 0;
2648         }
2649
2650         /* Block lock scheme */
2651         for (block = start; block < end + 1; block++) {
2652                 /* Set block address */
2653                 value = onenand_block_address(this, block);
2654                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2655                 /* Select DataRAM for DDP */
2656                 value = onenand_bufferram_address(this, block);
2657                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2658                 /* Set start block address */
2659                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2660                 /* Write lock command */
2661                 this->command(mtd, cmd, 0, 0);
2662
2663                 /* There's no return value */
2664                 this->wait(mtd, FL_LOCKING);
2665
2666                 /* Sanity check */
2667                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2668                     & ONENAND_CTRL_ONGO)
2669                         continue;
2670
2671                 /* Check lock status */
2672                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2673                 if (!(status & wp_status_mask))
2674                         printk(KERN_ERR "%s: block = %d, wp status = 0x%x\n",
2675                                 __func__, block, status);
2676         }
2677
2678         return 0;
2679 }
2680
2681 /**
2682  * onenand_lock - [MTD Interface] Lock block(s)
2683  * @param mtd           MTD device structure
2684  * @param ofs           offset relative to mtd start
2685  * @param len           number of bytes to unlock
2686  *
2687  * Lock one or more blocks
2688  */
2689 static int onenand_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
2690 {
2691         int ret;
2692
2693         onenand_get_device(mtd, FL_LOCKING);
2694         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_LOCK);
2695         onenand_release_device(mtd);
2696         return ret;
2697 }
2698
2699 /**
2700  * onenand_unlock - [MTD Interface] Unlock block(s)
2701  * @param mtd           MTD device structure
2702  * @param ofs           offset relative to mtd start
2703  * @param len           number of bytes to unlock
2704  *
2705  * Unlock one or more blocks
2706  */
2707 static int onenand_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
2708 {
2709         int ret;
2710
2711         onenand_get_device(mtd, FL_LOCKING);
2712         ret = onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2713         onenand_release_device(mtd);
2714         return ret;
2715 }
2716
2717 /**
2718  * onenand_check_lock_status - [OneNAND Interface] Check lock status
2719  * @param this          onenand chip data structure
2720  *
2721  * Check lock status
2722  */
2723 static int onenand_check_lock_status(struct onenand_chip *this)
2724 {
2725         unsigned int value, block, status;
2726         unsigned int end;
2727
2728         end = this->chipsize >> this->erase_shift;
2729         for (block = 0; block < end; block++) {
2730                 /* Set block address */
2731                 value = onenand_block_address(this, block);
2732                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS1);
2733                 /* Select DataRAM for DDP */
2734                 value = onenand_bufferram_address(this, block);
2735                 this->write_word(value, this->base + ONENAND_REG_START_ADDRESS2);
2736                 /* Set start block address */
2737                 this->write_word(block, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2738
2739                 /* Check lock status */
2740                 status = this->read_word(this->base + ONENAND_REG_WP_STATUS);
2741                 if (!(status & ONENAND_WP_US)) {
2742                         printk(KERN_ERR "%s: block = %d, wp status = 0x%x\n",
2743                                 __func__, block, status);
2744                         return 0;
2745                 }
2746         }
2747
2748         return 1;
2749 }
2750
2751 /**
2752  * onenand_unlock_all - [OneNAND Interface] unlock all blocks
2753  * @param mtd           MTD device structure
2754  *
2755  * Unlock all blocks
2756  */
2757 static void onenand_unlock_all(struct mtd_info *mtd)
2758 {
2759         struct onenand_chip *this = mtd->priv;
2760         loff_t ofs = 0;
2761         loff_t len = mtd->size;
2762
2763         if (this->options & ONENAND_HAS_UNLOCK_ALL) {
2764                 /* Set start block address */
2765                 this->write_word(0, this->base + ONENAND_REG_START_BLOCK_ADDRESS);
2766                 /* Write unlock command */
2767                 this->command(mtd, ONENAND_CMD_UNLOCK_ALL, 0, 0);
2768
2769                 /* There's no return value */
2770                 this->wait(mtd, FL_LOCKING);
2771
2772                 /* Sanity check */
2773                 while (this->read_word(this->base + ONENAND_REG_CTRL_STATUS)
2774                     & ONENAND_CTRL_ONGO)
2775                         continue;
2776
2777                 /* Don't check lock status */
2778                 if (this->options & ONENAND_SKIP_UNLOCK_CHECK)
2779                         return;
2780
2781                 /* Check lock status */
2782                 if (onenand_check_lock_status(this))
2783                         return;
2784
2785                 /* Workaround for all block unlock in DDP */
2786                 if (ONENAND_IS_DDP(this) && !FLEXONENAND(this)) {
2787                         /* All blocks on another chip */
2788                         ofs = this->chipsize >> 1;
2789                         len = this->chipsize >> 1;
2790                 }
2791         }
2792
2793         onenand_do_lock_cmd(mtd, ofs, len, ONENAND_CMD_UNLOCK);
2794 }
2795
2796 #ifdef CONFIG_MTD_ONENAND_OTP
2797
2798 /**
2799  * onenand_otp_command - Send OTP specific command to OneNAND device
2800  * @param mtd    MTD device structure
2801  * @param cmd    the command to be sent
2802  * @param addr   offset to read from or write to
2803  * @param len    number of bytes to read or write
2804  */
2805 static int onenand_otp_command(struct mtd_info *mtd, int cmd, loff_t addr,
2806                                 size_t len)
2807 {
2808         struct onenand_chip *this = mtd->priv;
2809         int value, block, page;
2810
2811         /* Address translation */
2812         switch (cmd) {
2813         case ONENAND_CMD_OTP_ACCESS:
2814                 block = (int) (addr >> this->erase_shift);
2815                 page = -1;
2816                 break;
2817
2818         default:
2819                 block = (int) (addr >> this->erase_shift);
2820                 page = (int) (addr >> this->page_shift);
2821
2822                 if (ONENAND_IS_2PLANE(this)) {
2823                         /* Make the even block number */
2824                         block &= ~1;
2825                         /* Is it the odd plane? */
2826                         if (addr & this->writesize)
2827                                 block++;
2828                         page >>= 1;
2829                 }
2830                 page &= this->page_mask;
2831                 break;
2832         }
2833
2834         if (block != -1) {
2835                 /* Write 'DFS, FBA' of Flash */
2836                 value = onenand_block_address(this, block);
2837                 this->write_word(value, this->base +
2838                                 ONENAND_REG_START_ADDRESS1);
2839         }
2840
2841         if (page != -1) {
2842                 /* Now we use page size operation */
2843                 int sectors = 4, count = 4;
2844                 int dataram;
2845
2846                 switch (cmd) {
2847                 default:
2848                         if (ONENAND_IS_2PLANE(this) && cmd == ONENAND_CMD_PROG)
2849                                 cmd = ONENAND_CMD_2X_PROG;
2850                         dataram = ONENAND_CURRENT_BUFFERRAM(this);
2851                         break;
2852                 }
2853
2854                 /* Write 'FPA, FSA' of Flash */
2855                 value = onenand_page_address(page, sectors);
2856                 this->write_word(value, this->base +
2857                                 ONENAND_REG_START_ADDRESS8);
2858
2859                 /* Write 'BSA, BSC' of DataRAM */
2860                 value = onenand_buffer_address(dataram, sectors, count);
2861                 this->write_word(value, this->base + ONENAND_REG_START_BUFFER);
2862         }
2863
2864         /* Interrupt clear */
2865         this->write_word(ONENAND_INT_CLEAR, this->base + ONENAND_REG_INTERRUPT);
2866
2867         /* Write command */
2868         this->write_word(cmd, this->base + ONENAND_REG_COMMAND);
2869
2870         return 0;
2871 }
2872
2873 /**
2874  * onenand_otp_write_oob_nolock - [Internal] OneNAND write out-of-band, specific to OTP
2875  * @param mtd           MTD device structure
2876  * @param to            offset to write to
2877  * @param len           number of bytes to write
2878  * @param retlen        pointer to variable to store the number of written bytes
2879  * @param buf           the data to write
2880  *
2881  * OneNAND write out-of-band only for OTP
2882  */
2883 static int onenand_otp_write_oob_nolock(struct mtd_info *mtd, loff_t to,
2884                                     struct mtd_oob_ops *ops)
2885 {
2886         struct onenand_chip *this = mtd->priv;
2887         int column, ret = 0, oobsize;
2888         int written = 0;
2889         u_char *oobbuf;
2890         size_t len = ops->ooblen;
2891         const u_char *buf = ops->oobbuf;
2892         int block, value, status;
2893
2894         to += ops->ooboffs;
2895
2896         /* Initialize retlen, in case of early exit */
2897         ops->oobretlen = 0;
2898
2899         oobsize = mtd->oobsize;
2900
2901         column = to & (mtd->oobsize - 1);
2902
2903         oobbuf = this->oob_buf;
2904
2905         /* Loop until all data write */
2906         while (written < len) {
2907                 int thislen = min_t(int, oobsize, len - written);
2908
2909                 cond_resched();
2910
2911                 block = (int) (to >> this->erase_shift);
2912                 /*
2913                  * Write 'DFS, FBA' of Flash
2914                  * Add: F100h DQ=DFS, FBA
2915                  */
2916
2917                 value = onenand_block_address(this, block);
2918                 this->write_word(value, this->base +
2919                                 ONENAND_REG_START_ADDRESS1);
2920
2921                 /*
2922                  * Select DataRAM for DDP
2923                  * Add: F101h DQ=DBS
2924                  */
2925
2926                 value = onenand_bufferram_address(this, block);
2927                 this->write_word(value, this->base +
2928                                 ONENAND_REG_START_ADDRESS2);
2929                 ONENAND_SET_NEXT_BUFFERRAM(this);
2930
2931                 /*
2932                  * Enter OTP access mode
2933                  */
2934                 this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
2935                 this->wait(mtd, FL_OTPING);
2936
2937                 /* We send data to spare ram with oobsize
2938                  * to prevent byte access */
2939                 memcpy(oobbuf + column, buf, thislen);
2940
2941                 /*
2942                  * Write Data into DataRAM
2943                  * Add: 8th Word
2944                  * in sector0/spare/page0
2945                  * DQ=XXFCh
2946                  */
2947                 this->write_bufferram(mtd, ONENAND_SPARERAM,
2948                                         oobbuf, 0, mtd->oobsize);
2949
2950                 onenand_otp_command(mtd, ONENAND_CMD_PROGOOB, to, mtd->oobsize);
2951                 onenand_update_bufferram(mtd, to, 0);
2952                 if (ONENAND_IS_2PLANE(this)) {
2953                         ONENAND_SET_BUFFERRAM1(this);
2954                         onenand_update_bufferram(mtd, to + this->writesize, 0);
2955                 }
2956
2957                 ret = this->wait(mtd, FL_WRITING);
2958                 if (ret) {
2959                         printk(KERN_ERR "%s: write failed %d\n", __func__, ret);
2960                         break;
2961                 }
2962
2963                 /* Exit OTP access mode */
2964                 this->command(mtd, ONENAND_CMD_RESET, 0, 0);
2965                 this->wait(mtd, FL_RESETING);
2966
2967                 status = this->read_word(this->base + ONENAND_REG_CTRL_STATUS);
2968                 status &= 0x60;
2969
2970                 if (status == 0x60) {
2971                         printk(KERN_DEBUG "\nBLOCK\tSTATUS\n");
2972                         printk(KERN_DEBUG "1st Block\tLOCKED\n");
2973                         printk(KERN_DEBUG "OTP Block\tLOCKED\n");
2974                 } else if (status == 0x20) {
2975                         printk(KERN_DEBUG "\nBLOCK\tSTATUS\n");
2976                         printk(KERN_DEBUG "1st Block\tLOCKED\n");
2977                         printk(KERN_DEBUG "OTP Block\tUN-LOCKED\n");
2978                 } else if (status == 0x40) {
2979                         printk(KERN_DEBUG "\nBLOCK\tSTATUS\n");
2980                         printk(KERN_DEBUG "1st Block\tUN-LOCKED\n");
2981                         printk(KERN_DEBUG "OTP Block\tLOCKED\n");
2982                 } else {
2983                         printk(KERN_DEBUG "Reboot to check\n");
2984                 }
2985
2986                 written += thislen;
2987                 if (written == len)
2988                         break;
2989
2990                 to += mtd->writesize;
2991                 buf += thislen;
2992                 column = 0;
2993         }
2994
2995         ops->oobretlen = written;
2996
2997         return ret;
2998 }
2999
3000 /* Internal OTP operation */
3001 typedef int (*otp_op_t)(struct mtd_info *mtd, loff_t form, size_t len,
3002                 size_t *retlen, u_char *buf);
3003
3004 /**
3005  * do_otp_read - [DEFAULT] Read OTP block area
3006  * @param mtd           MTD device structure
3007  * @param from          The offset to read
3008  * @param len           number of bytes to read
3009  * @param retlen        pointer to variable to store the number of readbytes
3010  * @param buf           the databuffer to put/get data
3011  *
3012  * Read OTP block area.
3013  */
3014 static int do_otp_read(struct mtd_info *mtd, loff_t from, size_t len,
3015                 size_t *retlen, u_char *buf)
3016 {
3017         struct onenand_chip *this = mtd->priv;
3018         struct mtd_oob_ops ops = {
3019                 .len    = len,
3020                 .ooblen = 0,
3021                 .datbuf = buf,
3022                 .oobbuf = NULL,
3023         };
3024         int ret;
3025
3026         /* Enter OTP access mode */
3027         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
3028         this->wait(mtd, FL_OTPING);
3029
3030         ret = ONENAND_IS_MLC(this) ?
3031                 onenand_mlc_read_ops_nolock(mtd, from, &ops) :
3032                 onenand_read_ops_nolock(mtd, from, &ops);
3033
3034         /* Exit OTP access mode */
3035         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
3036         this->wait(mtd, FL_RESETING);
3037
3038         return ret;
3039 }
3040
3041 /**
3042  * do_otp_write - [DEFAULT] Write OTP block area
3043  * @param mtd           MTD device structure
3044  * @param to            The offset to write
3045  * @param len           number of bytes to write
3046  * @param retlen        pointer to variable to store the number of write bytes
3047  * @param buf           the databuffer to put/get data
3048  *
3049  * Write OTP block area.
3050  */
3051 static int do_otp_write(struct mtd_info *mtd, loff_t to, size_t len,
3052                 size_t *retlen, u_char *buf)
3053 {
3054         struct onenand_chip *this = mtd->priv;
3055         unsigned char *pbuf = buf;
3056         int ret;
3057         struct mtd_oob_ops ops;
3058
3059         /* Force buffer page aligned */
3060         if (len < mtd->writesize) {
3061                 memcpy(this->page_buf, buf, len);
3062                 memset(this->page_buf + len, 0xff, mtd->writesize - len);
3063                 pbuf = this->page_buf;
3064                 len = mtd->writesize;
3065         }
3066
3067         /* Enter OTP access mode */
3068         this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
3069         this->wait(mtd, FL_OTPING);
3070
3071         ops.len = len;
3072         ops.ooblen = 0;
3073         ops.datbuf = pbuf;
3074         ops.oobbuf = NULL;
3075         ret = onenand_write_ops_nolock(mtd, to, &ops);
3076         *retlen = ops.retlen;
3077
3078         /* Exit OTP access mode */
3079         this->command(mtd, ONENAND_CMD_RESET, 0, 0);
3080         this->wait(mtd, FL_RESETING);
3081
3082         return ret;
3083 }
3084
3085 /**
3086  * do_otp_lock - [DEFAULT] Lock OTP block area
3087  * @param mtd           MTD device structure
3088  * @param from          The offset to lock
3089  * @param len           number of bytes to lock
3090  * @param retlen        pointer to variable to store the number of lock bytes
3091  * @param buf           the databuffer to put/get data
3092  *
3093  * Lock OTP block area.
3094  */
3095 static int do_otp_lock(struct mtd_info *mtd, loff_t from, size_t len,
3096                 size_t *retlen, u_char *buf)
3097 {
3098         struct onenand_chip *this = mtd->priv;
3099         struct mtd_oob_ops ops;
3100         int ret;
3101
3102         if (FLEXONENAND(this)) {
3103
3104                 /* Enter OTP access mode */
3105                 this->command(mtd, ONENAND_CMD_OTP_ACCESS, 0, 0);
3106                 this->wait(mtd, FL_OTPING);
3107                 /*
3108                  * For Flex-OneNAND, we write lock mark to 1st word of sector 4 of
3109                  * main area of page 49.
3110                  */
3111                 ops.len = mtd->writesize;
3112                 ops.ooblen = 0;
3113                 ops.datbuf = buf;
3114                 ops.oobbuf = NULL;
3115                 ret = onenand_write_ops_nolock(mtd, mtd->writesize * 49, &ops);
3116                 *retlen = ops.retlen;
3117
3118                 /* Exit OTP access mode */
3119                 this->command(mtd, ONENAND_CMD_RESET, 0, 0);
3120                 this->wait(mtd, FL_RESETING);
3121         } else {
3122                 ops.mode = MTD_OOB_PLACE;
3123                 ops.ooblen = len;
3124                 ops.oobbuf = buf;
3125                 ops.ooboffs = 0;
3126                 ret = onenand_otp_write_oob_nolock(mtd, from, &ops);
3127                 *retlen = ops.oobretlen;
3128         }
3129
3130         return ret;
3131 }
3132
3133 /**
3134  * onenand_otp_walk - [DEFAULT] Handle OTP operation
3135  * @param mtd           MTD device structure
3136  * @param from          The offset to read/write
3137  * @param len           number of bytes to read/write
3138  * @param retlen        pointer to variable to store the number of read bytes
3139  * @param buf           the databuffer to put/get data
3140  * @param action        do given action
3141  * @param mode          specify user and factory
3142  *
3143  * Handle OTP operation.
3144  */
3145 static int onenand_otp_walk(struct mtd_info *mtd, loff_t from, size_t len,
3146                         size_t *retlen, u_char *buf,
3147                         otp_op_t action, int mode)
3148 {
3149         struct onenand_chip *this = mtd->priv;
3150         int otp_pages;
3151         int density;
3152         int ret = 0;
3153
3154         *retlen = 0;
3155
3156         density = onenand_get_density(this->device_id);
3157         if (density < ONENAND_DEVICE_DENSITY_512Mb)
3158                 otp_pages = 20;
3159         else
3160                 otp_pages = 50;
3161
3162         if (mode == MTD_OTP_FACTORY) {
3163                 from += mtd->writesize * otp_pages;
3164                 otp_pages = ONENAND_PAGES_PER_BLOCK - otp_pages;
3165         }
3166
3167         /* Check User/Factory boundary */
3168         if (mode == MTD_OTP_USER) {
3169                 if (mtd->writesize * otp_pages < from + len)
3170                         return 0;
3171         } else {
3172                 if (mtd->writesize * otp_pages <  len)
3173                         return 0;
3174         }
3175
3176         onenand_get_device(mtd, FL_OTPING);
3177         while (len > 0 && otp_pages > 0) {
3178                 if (!action) {  /* OTP Info functions */
3179                         struct otp_info *otpinfo;
3180
3181                         len -= sizeof(struct otp_info);
3182                         if (len <= 0) {
3183                                 ret = -ENOSPC;
3184                                 break;
3185                         }
3186
3187                         otpinfo = (struct otp_info *) buf;
3188                         otpinfo->start = from;
3189                         otpinfo->length = mtd->writesize;
3190                         otpinfo->locked = 0;
3191
3192                         from += mtd->writesize;
3193                         buf += sizeof(struct otp_info);
3194                         *retlen += sizeof(struct otp_info);
3195                 } else {
3196                         size_t tmp_retlen;
3197
3198                         ret = action(mtd, from, len, &tmp_retlen, buf);
3199
3200                         buf += tmp_retlen;
3201                         len -= tmp_retlen;
3202                         *retlen += tmp_retlen;
3203
3204                         if (ret)
3205                                 break;
3206                 }
3207                 otp_pages--;
3208         }
3209         onenand_release_device(mtd);
3210
3211         return ret;
3212 }
3213
3214 /**
3215  * onenand_get_fact_prot_info - [MTD Interface] Read factory OTP info
3216  * @param mtd           MTD device structure
3217  * @param buf           the databuffer to put/get data
3218  * @param len           number of bytes to read
3219  *
3220  * Read factory OTP info.
3221  */
3222 static int onenand_get_fact_prot_info(struct mtd_info *mtd,
3223                         struct otp_info *buf, size_t len)
3224 {
3225         size_t retlen;
3226         int ret;
3227
3228         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_FACTORY);
3229
3230         return ret ? : retlen;
3231 }
3232
3233 /**
3234  * onenand_read_fact_prot_reg - [MTD Interface] Read factory OTP area
3235  * @param mtd           MTD device structure
3236  * @param from          The offset to read
3237  * @param len           number of bytes to read
3238  * @param retlen        pointer to variable to store the number of read bytes
3239  * @param buf           the databuffer to put/get data
3240  *
3241  * Read factory OTP area.
3242  */
3243 static int onenand_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
3244                         size_t len, size_t *retlen, u_char *buf)
3245 {
3246         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_FACTORY);
3247 }
3248
3249 /**
3250  * onenand_get_user_prot_info - [MTD Interface] Read user OTP info
3251  * @param mtd           MTD device structure
3252  * @param buf           the databuffer to put/get data
3253  * @param len           number of bytes to read
3254  *
3255  * Read user OTP info.
3256  */
3257 static int onenand_get_user_prot_info(struct mtd_info *mtd,
3258                         struct otp_info *buf, size_t len)
3259 {
3260         size_t retlen;
3261         int ret;
3262
3263         ret = onenand_otp_walk(mtd, 0, len, &retlen, (u_char *) buf, NULL, MTD_OTP_USER);
3264
3265         return ret ? : retlen;
3266 }
3267
3268 /**
3269  * onenand_read_user_prot_reg - [MTD Interface] Read user OTP area
3270  * @param mtd           MTD device structure
3271  * @param from          The offset to read
3272  * @param len           number of bytes to read
3273  * @param retlen        pointer to variable to store the number of read bytes
3274  * @param buf           the databuffer to put/get data
3275  *
3276  * Read user OTP area.
3277  */
3278 static int onenand_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
3279                         size_t len, size_t *retlen, u_char *buf)
3280 {
3281         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_read, MTD_OTP_USER);
3282 }
3283
3284 /**
3285  * onenand_write_user_prot_reg - [MTD Interface] Write user OTP area
3286  * @param mtd           MTD device structure
3287  * @param from          The offset to write
3288  * @param len           number of bytes to write
3289  * @param retlen        pointer to variable to store the number of write bytes
3290  * @param buf           the databuffer to put/get data
3291  *
3292  * Write user OTP area.
3293  */
3294 static int onenand_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
3295                         size_t len, size_t *retlen, u_char *buf)
3296 {
3297         return onenand_otp_walk(mtd, from, len, retlen, buf, do_otp_write, MTD_OTP_USER);
3298 }
3299
3300 /**
3301  * onenand_lock_user_prot_reg - [MTD Interface] Lock user OTP area
3302  * @param mtd           MTD device structure
3303  * @param from          The offset to lock
3304  * @param len           number of bytes to unlock
3305  *
3306  * Write lock mark on spare area in page 0 in OTP block
3307  */
3308 static int onenand_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
3309                         size_t len)
3310 {
3311         struct onenand_chip *this = mtd->priv;
3312         u_char *buf = FLEXONENAND(this) ? this->page_buf : this->oob_buf;
3313         size_t retlen;
3314         int ret;
3315         unsigned int otp_lock_offset = ONENAND_OTP_LOCK_OFFSET;
3316
3317         memset(buf, 0xff, FLEXONENAND(this) ? this->writesize
3318                                                  : mtd->oobsize);
3319         /*
3320          * Write lock mark to 8th word of sector0 of page0 of the spare0.
3321          * We write 16 bytes spare area instead of 2 bytes.
3322          * For Flex-OneNAND, we write lock mark to 1st word of sector 4 of
3323          * main area of page 49.
3324          */
3325
3326         from = 0;
3327         len = FLEXONENAND(this) ? mtd->writesize : 16;
3328
3329         /*
3330          * Note: OTP lock operation
3331          *       OTP block : 0xXXFC                     XX 1111 1100
3332          *       1st block : 0xXXF3 (If chip support)   XX 1111 0011
3333          *       Both      : 0xXXF0 (If chip support)   XX 1111 0000
3334          */
3335         if (FLEXONENAND(this))
3336                 otp_lock_offset = FLEXONENAND_OTP_LOCK_OFFSET;
3337
3338         /* ONENAND_OTP_AREA | ONENAND_OTP_BLOCK0 | ONENAND_OTP_AREA_BLOCK0 */
3339         if (otp == 1)
3340                 buf[otp_lock_offset] = 0xFC;
3341         else if (otp == 2)
3342                 buf[otp_lock_offset] = 0xF3;
3343         else if (otp == 3)
3344                 buf[otp_lock_offset] = 0xF0;
3345         else if (otp != 0)
3346                 printk(KERN_DEBUG "[OneNAND] Invalid option selected for OTP\n");
3347
3348         ret = onenand_otp_walk(mtd, from, len, &retlen, buf, do_otp_lock, MTD_OTP_USER);
3349
3350         return ret ? : retlen;
3351 }
3352
3353 #endif  /* CONFIG_MTD_ONENAND_OTP */
3354
3355 /**
3356  * onenand_check_features - Check and set OneNAND features
3357  * @param mtd           MTD data structure
3358  *
3359  * Check and set OneNAND features
3360  * - lock scheme
3361  * - two plane
3362  */
3363 static void onenand_check_features(struct mtd_info *mtd)
3364 {
3365         struct onenand_chip *this = mtd->priv;
3366         unsigned int density, process;
3367
3368         /* Lock scheme depends on density and process */
3369         density = onenand_get_density(this->device_id);
3370         process = this->version_id >> ONENAND_VERSION_PROCESS_SHIFT;
3371
3372         /* Lock scheme */
3373         switch (density) {
3374         case ONENAND_DEVICE_DENSITY_4Gb:
3375                 this->options |= ONENAND_HAS_2PLANE;
3376
3377         case ONENAND_DEVICE_DENSITY_2Gb:
3378                 /* 2Gb DDP does not have 2 plane */
3379                 if (!ONENAND_IS_DDP(this))
3380                         this->options |= ONENAND_HAS_2PLANE;
3381                 this->options |= ONENAND_HAS_UNLOCK_ALL;
3382
3383         case ONENAND_DEVICE_DENSITY_1Gb:
3384                 /* A-Die has all block unlock */
3385                 if (process)
3386                         this->options |= ONENAND_HAS_UNLOCK_ALL;
3387                 break;
3388
3389         default:
3390                 /* Some OneNAND has continuous lock scheme */
3391                 if (!process)
3392                         this->options |= ONENAND_HAS_CONT_LOCK;
3393                 break;
3394         }
3395
3396         if (ONENAND_IS_MLC(this))
3397                 this->options &= ~ONENAND_HAS_2PLANE;
3398
3399         if (FLEXONENAND(this)) {
3400                 this->options &= ~ONENAND_HAS_CONT_LOCK;
3401                 this->options |= ONENAND_HAS_UNLOCK_ALL;
3402         }
3403
3404         if (this->options & ONENAND_HAS_CONT_LOCK)
3405                 printk(KERN_DEBUG "Lock scheme is Continuous Lock\n");
3406         if (this->options & ONENAND_HAS_UNLOCK_ALL)
3407                 printk(KERN_DEBUG "Chip support all block unlock\n");
3408         if (this->options & ONENAND_HAS_2PLANE)
3409                 printk(KERN_DEBUG "Chip has 2 plane\n");
3410 }
3411
3412 /**
3413  * onenand_print_device_info - Print device & version ID
3414  * @param device        device ID
3415  * @param version       version ID
3416  *
3417  * Print device & version ID
3418  */
3419 static void onenand_print_device_info(int device, int version)
3420 {
3421         int vcc, demuxed, ddp, density, flexonenand;
3422
3423         vcc = device & ONENAND_DEVICE_VCC_MASK;
3424         demuxed = device & ONENAND_DEVICE_IS_DEMUX;
3425         ddp = device & ONENAND_DEVICE_IS_DDP;
3426         density = onenand_get_density(device);
3427         flexonenand = device & DEVICE_IS_FLEXONENAND;
3428         printk(KERN_INFO "%s%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
3429                 demuxed ? "" : "Muxed ",
3430                 flexonenand ? "Flex-" : "",
3431                 ddp ? "(DDP)" : "",
3432                 (16 << density),
3433                 vcc ? "2.65/3.3" : "1.8",
3434                 device);
3435         printk(KERN_INFO "OneNAND version = 0x%04x\n", version);
3436 }
3437
3438 static const struct onenand_manufacturers onenand_manuf_ids[] = {
3439         {ONENAND_MFR_SAMSUNG, "Samsung"},
3440         {ONENAND_MFR_NUMONYX, "Numonyx"},
3441 };
3442
3443 /**
3444  * onenand_check_maf - Check manufacturer ID
3445  * @param manuf         manufacturer ID
3446  *
3447  * Check manufacturer ID
3448  */
3449 static int onenand_check_maf(int manuf)
3450 {
3451         int size = ARRAY_SIZE(onenand_manuf_ids);
3452         char *name;
3453         int i;
3454
3455         for (i = 0; i < size; i++)
3456                 if (manuf == onenand_manuf_ids[i].id)
3457                         break;
3458
3459         if (i < size)
3460                 name = onenand_manuf_ids[i].name;
3461         else
3462                 name = "Unknown";
3463
3464         printk(KERN_DEBUG "OneNAND Manufacturer: %s (0x%0x)\n", name, manuf);
3465
3466         return (i == size);
3467 }
3468
3469 /**
3470 * flexonenand_get_boundary      - Reads the SLC boundary
3471 * @param onenand_info           - onenand info structure
3472 **/
3473 static int flexonenand_get_boundary(struct mtd_info *mtd)
3474 {
3475         struct onenand_chip *this = mtd->priv;
3476         unsigned die, bdry;
3477         int ret, syscfg, locked;
3478
3479         /* Disable ECC */
3480         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
3481         this->write_word((syscfg | 0x0100), this->base + ONENAND_REG_SYS_CFG1);
3482
3483         for (die = 0; die < this->dies; die++) {
3484                 this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
3485                 this->wait(mtd, FL_SYNCING);
3486
3487                 this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
3488                 ret = this->wait(mtd, FL_READING);
3489
3490                 bdry = this->read_word(this->base + ONENAND_DATARAM);
3491                 if ((bdry >> FLEXONENAND_PI_UNLOCK_SHIFT) == 3)
3492                         locked = 0;
3493                 else
3494                         locked = 1;
3495                 this->boundary[die] = bdry & FLEXONENAND_PI_MASK;
3496
3497                 this->command(mtd, ONENAND_CMD_RESET, 0, 0);
3498                 ret = this->wait(mtd, FL_RESETING);
3499
3500                 printk(KERN_INFO "Die %d boundary: %d%s\n", die,
3501                        this->boundary[die], locked ? "(Locked)" : "(Unlocked)");
3502         }
3503
3504         /* Enable ECC */
3505         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
3506         return 0;
3507 }
3508
3509 /**
3510  * flexonenand_get_size - Fill up fields in onenand_chip and mtd_info
3511  *                        boundary[], diesize[], mtd->size, mtd->erasesize
3512  * @param mtd           - MTD device structure
3513  */
3514 static void flexonenand_get_size(struct mtd_info *mtd)
3515 {
3516         struct onenand_chip *this = mtd->priv;
3517         int die, i, eraseshift, density;
3518         int blksperdie, maxbdry;
3519         loff_t ofs;
3520
3521         density = onenand_get_density(this->device_id);
3522         blksperdie = ((loff_t)(16 << density) << 20) >> (this->erase_shift);
3523         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
3524         maxbdry = blksperdie - 1;
3525         eraseshift = this->erase_shift - 1;
3526
3527         mtd->numeraseregions = this->dies << 1;
3528
3529         /* This fills up the device boundary */
3530         flexonenand_get_boundary(mtd);
3531         die = ofs = 0;
3532         i = -1;
3533         for (; die < this->dies; die++) {
3534                 if (!die || this->boundary[die-1] != maxbdry) {
3535                         i++;
3536                         mtd->eraseregions[i].offset = ofs;
3537                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
3538                         mtd->eraseregions[i].numblocks =
3539                                                         this->boundary[die] + 1;
3540                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
3541                         eraseshift++;
3542                 } else {
3543                         mtd->numeraseregions -= 1;
3544                         mtd->eraseregions[i].numblocks +=
3545                                                         this->boundary[die] + 1;
3546                         ofs += (this->boundary[die] + 1) << (eraseshift - 1);
3547                 }
3548                 if (this->boundary[die] != maxbdry) {
3549                         i++;
3550                         mtd->eraseregions[i].offset = ofs;
3551                         mtd->eraseregions[i].erasesize = 1 << eraseshift;
3552                         mtd->eraseregions[i].numblocks = maxbdry ^
3553                                                          this->boundary[die];
3554                         ofs += mtd->eraseregions[i].numblocks << eraseshift;
3555                         eraseshift--;
3556                 } else
3557                         mtd->numeraseregions -= 1;
3558         }
3559
3560         /* Expose MLC erase size except when all blocks are SLC */
3561         mtd->erasesize = 1 << this->erase_shift;
3562         if (mtd->numeraseregions == 1)
3563                 mtd->erasesize >>= 1;
3564
3565         printk(KERN_INFO "Device has %d eraseregions\n", mtd->numeraseregions);
3566         for (i = 0; i < mtd->numeraseregions; i++)
3567                 printk(KERN_INFO "[offset: 0x%08x, erasesize: 0x%05x,"
3568                         " numblocks: %04u]\n",
3569                         (unsigned int) mtd->eraseregions[i].offset,
3570                         mtd->eraseregions[i].erasesize,
3571                         mtd->eraseregions[i].numblocks);
3572
3573         for (die = 0, mtd->size = 0; die < this->dies; die++) {
3574                 this->diesize[die] = (loff_t)blksperdie << this->erase_shift;
3575                 this->diesize[die] -= (loff_t)(this->boundary[die] + 1)
3576                                                  << (this->erase_shift - 1);
3577                 mtd->size += this->diesize[die];
3578         }
3579 }
3580
3581 /**
3582  * flexonenand_check_blocks_erased - Check if blocks are erased
3583  * @param mtd_info      - mtd info structure
3584  * @param start         - first erase block to check
3585  * @param end           - last erase block to check
3586  *
3587  * Converting an unerased block from MLC to SLC
3588  * causes byte values to change. Since both data and its ECC
3589  * have changed, reads on the block give uncorrectable error.
3590  * This might lead to the block being detected as bad.
3591  *
3592  * Avoid this by ensuring that the block to be converted is
3593  * erased.
3594  */
3595 static int flexonenand_check_blocks_erased(struct mtd_info *mtd, int start, int end)
3596 {
3597         struct onenand_chip *this = mtd->priv;
3598         int i, ret;
3599         int block;
3600         struct mtd_oob_ops ops = {
3601                 .mode = MTD_OOB_PLACE,
3602                 .ooboffs = 0,
3603                 .ooblen = mtd->oobsize,
3604                 .datbuf = NULL,
3605                 .oobbuf = this->oob_buf,
3606         };
3607         loff_t addr;
3608
3609         printk(KERN_DEBUG "Check blocks from %d to %d\n", start, end);
3610
3611         for (block = start; block <= end; block++) {
3612                 addr = flexonenand_addr(this, block);
3613                 if (onenand_block_isbad_nolock(mtd, addr, 0))
3614                         continue;
3615
3616                 /*
3617                  * Since main area write results in ECC write to spare,
3618                  * it is sufficient to check only ECC bytes for change.
3619                  */
3620                 ret = onenand_read_oob_nolock(mtd, addr, &ops);
3621                 if (ret)
3622                         return ret;
3623
3624                 for (i = 0; i < mtd->oobsize; i++)
3625                         if (this->oob_buf[i] != 0xff)
3626                                 break;
3627
3628                 if (i != mtd->oobsize) {
3629                         printk(KERN_WARNING "%s: Block %d not erased.\n",
3630                                 __func__, block);
3631                         return 1;
3632                 }
3633         }
3634
3635         return 0;
3636 }
3637
3638 /**
3639  * flexonenand_set_boundary     - Writes the SLC boundary
3640  * @param mtd                   - mtd info structure
3641  */
3642 int flexonenand_set_boundary(struct mtd_info *mtd, int die,
3643                                     int boundary, int lock)
3644 {
3645         struct onenand_chip *this = mtd->priv;
3646         int ret, density, blksperdie, old, new, thisboundary;
3647         loff_t addr;
3648
3649         /* Change only once for SDP Flex-OneNAND */
3650         if (die && (!ONENAND_IS_DDP(this)))
3651                 return 0;
3652
3653         /* boundary value of -1 indicates no required change */
3654         if (boundary < 0 || boundary == this->boundary[die])
3655                 return 0;
3656
3657         density = onenand_get_density(this->device_id);
3658         blksperdie = ((16 << density) << 20) >> this->erase_shift;
3659         blksperdie >>= ONENAND_IS_DDP(this) ? 1 : 0;
3660
3661         if (boundary >= blksperdie) {
3662                 printk(KERN_ERR "%s: Invalid boundary value. "
3663                                 "Boundary not changed.\n", __func__);
3664                 return -EINVAL;
3665         }
3666
3667         /* Check if converting blocks are erased */
3668         old = this->boundary[die] + (die * this->density_mask);
3669         new = boundary + (die * this->density_mask);
3670         ret = flexonenand_check_blocks_erased(mtd, min(old, new) + 1, max(old, new));
3671         if (ret) {
3672                 printk(KERN_ERR "%s: Please erase blocks "
3673                                 "before boundary change\n", __func__);
3674                 return ret;
3675         }
3676
3677         this->command(mtd, FLEXONENAND_CMD_PI_ACCESS, die, 0);
3678         this->wait(mtd, FL_SYNCING);
3679
3680         /* Check is boundary is locked */
3681         this->command(mtd, FLEXONENAND_CMD_READ_PI, die, 0);
3682         ret = this->wait(mtd, FL_READING);
3683
3684         thisboundary = this->read_word(this->base + ONENAND_DATARAM);
3685         if ((thisboundary >> FLEXONENAND_PI_UNLOCK_SHIFT) != 3) {
3686                 printk(KERN_ERR "%s: boundary locked\n", __func__);
3687                 ret = 1;
3688                 goto out;
3689         }
3690
3691         printk(KERN_INFO "Changing die %d boundary: %d%s\n",
3692                         die, boundary, lock ? "(Locked)" : "(Unlocked)");
3693
3694         addr = die ? this->diesize[0] : 0;
3695
3696         boundary &= FLEXONENAND_PI_MASK;
3697         boundary |= lock ? 0 : (3 << FLEXONENAND_PI_UNLOCK_SHIFT);
3698
3699         this->command(mtd, ONENAND_CMD_ERASE, addr, 0);
3700         ret = this->wait(mtd, FL_ERASING);
3701         if (ret) {
3702                 printk(KERN_ERR "%s: Failed PI erase for Die %d\n",
3703                        __func__, die);
3704                 goto out;
3705         }
3706
3707         this->write_word(boundary, this->base + ONENAND_DATARAM);
3708         this->command(mtd, ONENAND_CMD_PROG, addr, 0);
3709         ret = this->wait(mtd, FL_WRITING);
3710         if (ret) {
3711                 printk(KERN_ERR "%s: Failed PI write for Die %d\n",
3712                         __func__, die);
3713                 goto out;
3714         }
3715
3716         this->command(mtd, FLEXONENAND_CMD_PI_UPDATE, die, 0);
3717         ret = this->wait(mtd, FL_WRITING);
3718 out:
3719         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_REG_COMMAND);
3720         this->wait(mtd, FL_RESETING);
3721         if (!ret)
3722                 /* Recalculate device size on boundary change*/
3723                 flexonenand_get_size(mtd);
3724
3725         return ret;
3726 }
3727
3728 /**
3729  * onenand_probe - [OneNAND Interface] Probe the OneNAND device
3730  * @param mtd           MTD device structure
3731  *
3732  * OneNAND detection method:
3733  *   Compare the values from command with ones from register
3734  */
3735 static int onenand_probe(struct mtd_info *mtd)
3736 {
3737         struct onenand_chip *this = mtd->priv;
3738         int bram_maf_id, bram_dev_id, maf_id, dev_id, ver_id;
3739         int density;
3740         int syscfg;
3741
3742         /* Save system configuration 1 */
3743         syscfg = this->read_word(this->base + ONENAND_REG_SYS_CFG1);
3744         /* Clear Sync. Burst Read mode to read BootRAM */
3745         this->write_word((syscfg & ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE), this->base + ONENAND_REG_SYS_CFG1);
3746
3747         /* Send the command for reading device ID from BootRAM */
3748         this->write_word(ONENAND_CMD_READID, this->base + ONENAND_BOOTRAM);
3749
3750         /* Read manufacturer and device IDs from BootRAM */
3751         bram_maf_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x0);
3752         bram_dev_id = this->read_word(this->base + ONENAND_BOOTRAM + 0x2);
3753
3754         /* Reset OneNAND to read default register values */
3755         this->write_word(ONENAND_CMD_RESET, this->base + ONENAND_BOOTRAM);
3756         /* Wait reset */
3757         this->wait(mtd, FL_RESETING);
3758
3759         /* Restore system configuration 1 */
3760         this->write_word(syscfg, this->base + ONENAND_REG_SYS_CFG1);
3761
3762         /* Check manufacturer ID */
3763         if (onenand_check_maf(bram_maf_id))
3764                 return -ENXIO;
3765
3766         /* Read manufacturer and device IDs from Register */
3767         maf_id = this->read_word(this->base + ONENAND_REG_MANUFACTURER_ID);
3768         dev_id = this->read_word(this->base + ONENAND_REG_DEVICE_ID);
3769         ver_id = this->read_word(this->base + ONENAND_REG_VERSION_ID);
3770         this->technology = this->read_word(this->base + ONENAND_REG_TECHNOLOGY);
3771
3772         /* Check OneNAND device */
3773         if (maf_id != bram_maf_id || dev_id != bram_dev_id)
3774                 return -ENXIO;
3775
3776         /* Flash device information */
3777         onenand_print_device_info(dev_id, ver_id);
3778         this->device_id = dev_id;
3779         this->version_id = ver_id;
3780
3781         density = onenand_get_density(dev_id);
3782         if (FLEXONENAND(this)) {
3783                 this->dies = ONENAND_IS_DDP(this) ? 2 : 1;
3784                 /* Maximum possible erase regions */
3785                 mtd->numeraseregions = this->dies << 1;
3786                 mtd->eraseregions = kzalloc(sizeof(struct mtd_erase_region_info)
3787                                         * (this->dies << 1), GFP_KERNEL);
3788                 if (!mtd->eraseregions)
3789                         return -ENOMEM;
3790         }
3791
3792         /*
3793          * For Flex-OneNAND, chipsize represents maximum possible device size.
3794          * mtd->size represents the actual device size.
3795          */
3796         this->chipsize = (16 << density) << 20;
3797
3798         /* OneNAND page size & block size */
3799         /* The data buffer size is equal to page size */
3800         mtd->writesize = this->read_word(this->base + ONENAND_REG_DATA_BUFFER_SIZE);
3801         /* We use the full BufferRAM */
3802         if (ONENAND_IS_MLC(this))
3803                 mtd->writesize <<= 1;
3804
3805         mtd->oobsize = mtd->writesize >> 5;
3806         /* Pages per a block are always 64 in OneNAND */
3807         mtd->erasesize = mtd->writesize << 6;
3808         /*
3809          * Flex-OneNAND SLC area has 64 pages per block.
3810          * Flex-OneNAND MLC area has 128 pages per block.
3811          * Expose MLC erase size to find erase_shift and page_mask.
3812          */
3813         if (FLEXONENAND(this))
3814                 mtd->erasesize <<= 1;
3815
3816         this->erase_shift = ffs(mtd->erasesize) - 1;
3817         this->page_shift = ffs(mtd->writesize) - 1;
3818         this->page_mask = (1 << (this->erase_shift - this->page_shift)) - 1;
3819         /* Set density mask. it is used for DDP */
3820         if (ONENAND_IS_DDP(this))
3821                 this->density_mask = this->chipsize >> (this->erase_shift + 1);
3822         /* It's real page size */
3823         this->writesize = mtd->writesize;
3824
3825         /* REVISIT: Multichip handling */
3826
3827         if (FLEXONENAND(this))
3828                 flexonenand_get_size(mtd);
3829         else
3830                 mtd->size = this->chipsize;
3831
3832         /* Check OneNAND features */
3833         onenand_check_features(mtd);
3834
3835         /*
3836          * We emulate the 4KiB page and 256KiB erase block size
3837          * But oobsize is still 64 bytes.
3838          * It is only valid if you turn on 2X program support,
3839          * Otherwise it will be ignored by compiler.
3840          */
3841         if (ONENAND_IS_2PLANE(this)) {
3842                 mtd->writesize <<= 1;
3843                 mtd->erasesize <<= 1;
3844         }
3845
3846         return 0;
3847 }
3848
3849 /**
3850  * onenand_suspend - [MTD Interface] Suspend the OneNAND flash
3851  * @param mtd           MTD device structure
3852  */
3853 static int onenand_suspend(struct mtd_info *mtd)
3854 {
3855         return onenand_get_device(mtd, FL_PM_SUSPENDED);
3856 }
3857
3858 /**
3859  * onenand_resume - [MTD Interface] Resume the OneNAND flash
3860  * @param mtd           MTD device structure
3861  */
3862 static void onenand_resume(struct mtd_info *mtd)
3863 {
3864         struct onenand_chip *this = mtd->priv;
3865
3866         if (this->state == FL_PM_SUSPENDED)
3867                 onenand_release_device(mtd);
3868         else
3869                 printk(KERN_ERR "%s: resume() called for the chip which is not "
3870                                 "in suspended state\n", __func__);
3871 }
3872
3873 /**
3874  * onenand_scan - [OneNAND Interface] Scan for the OneNAND device
3875  * @param mtd           MTD device structure
3876  * @param maxchips      Number of chips to scan for
3877  *
3878  * This fills out all the not initialized function pointers
3879  * with the defaults.
3880  * The flash ID is read and the mtd/chip structures are
3881  * filled with the appropriate values.
3882  */
3883 int onenand_scan(struct mtd_info *mtd, int maxchips)
3884 {
3885         int i, ret;
3886         struct onenand_chip *this = mtd->priv;
3887
3888         if (!this->read_word)
3889                 this->read_word = onenand_readw;
3890         if (!this->write_word)
3891                 this->write_word = onenand_writew;
3892
3893         if (!this->command)
3894                 this->command = onenand_command;
3895         if (!this->wait)
3896                 onenand_setup_wait(mtd);
3897         if (!this->bbt_wait)
3898                 this->bbt_wait = onenand_bbt_wait;
3899         if (!this->unlock_all)
3900                 this->unlock_all = onenand_unlock_all;
3901
3902         if (!this->read_bufferram)
3903                 this->read_bufferram = onenand_read_bufferram;
3904         if (!this->write_bufferram)
3905                 this->write_bufferram = onenand_write_bufferram;
3906
3907         if (!this->block_markbad)
3908                 this->block_markbad = onenand_default_block_markbad;
3909         if (!this->scan_bbt)
3910                 this->scan_bbt = onenand_default_bbt;
3911
3912         if (onenand_probe(mtd))
3913                 return -ENXIO;
3914
3915         /* Set Sync. Burst Read after probing */
3916         if (this->mmcontrol) {
3917                 printk(KERN_INFO "OneNAND Sync. Burst Read support\n");
3918                 this->read_bufferram = onenand_sync_read_bufferram;
3919         }
3920
3921         /* Allocate buffers, if necessary */
3922         if (!this->page_buf) {
3923                 this->page_buf = kzalloc(mtd->writesize, GFP_KERNEL);
3924                 if (!this->page_buf) {
3925                         printk(KERN_ERR "%s: Can't allocate page_buf\n",
3926                                 __func__);
3927                         return -ENOMEM;
3928                 }
3929                 this->options |= ONENAND_PAGEBUF_ALLOC;
3930         }
3931         if (!this->oob_buf) {
3932                 this->oob_buf = kzalloc(mtd->oobsize, GFP_KERNEL);
3933                 if (!this->oob_buf) {
3934                         printk(KERN_ERR "%s: Can't allocate oob_buf\n",
3935                                 __func__);
3936                         if (this->options & ONENAND_PAGEBUF_ALLOC) {
3937                                 this->options &= ~ONENAND_PAGEBUF_ALLOC;
3938                                 kfree(this->page_buf);
3939                         }
3940                         return -ENOMEM;
3941                 }
3942                 this->options |= ONENAND_OOBBUF_ALLOC;
3943         }
3944
3945         this->state = FL_READY;
3946         init_waitqueue_head(&this->wq);
3947         spin_lock_init(&this->chip_lock);
3948
3949         /*
3950          * Allow subpage writes up to oobsize.
3951          */
3952         switch (mtd->oobsize) {
3953         case 128:
3954                 this->ecclayout = &onenand_oob_128;
3955                 mtd->subpage_sft = 0;
3956                 break;
3957         case 64:
3958                 this->ecclayout = &onenand_oob_64;
3959                 mtd->subpage_sft = 2;
3960                 break;
3961
3962         case 32:
3963                 this->ecclayout = &onenand_oob_32;
3964                 mtd->subpage_sft = 1;
3965                 break;
3966
3967         default:
3968                 printk(KERN_WARNING "%s: No OOB scheme defined for oobsize %d\n",
3969                         __func__, mtd->oobsize);
3970                 mtd->subpage_sft = 0;
3971                 /* To prevent kernel oops */
3972                 this->ecclayout = &onenand_oob_32;
3973                 break;
3974         }
3975
3976         this->subpagesize = mtd->writesize >> mtd->subpage_sft;
3977
3978         /*
3979          * The number of bytes available for a client to place data into
3980          * the out of band area
3981          */
3982         this->ecclayout->oobavail = 0;
3983         for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES &&
3984             this->ecclayout->oobfree[i].length; i++)
3985                 this->ecclayout->oobavail +=
3986                         this->ecclayout->oobfree[i].length;
3987         mtd->oobavail = this->ecclayout->oobavail;
3988
3989         mtd->ecclayout = this->ecclayout;
3990
3991         /* Fill in remaining MTD driver data */
3992         mtd->type = MTD_NANDFLASH;
3993         mtd->flags = MTD_CAP_NANDFLASH;
3994         mtd->erase = onenand_erase;
3995         mtd->point = NULL;
3996         mtd->unpoint = NULL;
3997         mtd->read = onenand_read;
3998         mtd->write = onenand_write;
3999         mtd->read_oob = onenand_read_oob;
4000         mtd->write_oob = onenand_write_oob;
4001         mtd->panic_write = onenand_panic_write;
4002 #ifdef CONFIG_MTD_ONENAND_OTP
4003         mtd->get_fact_prot_info = onenand_get_fact_prot_info;
4004         mtd->read_fact_prot_reg = onenand_read_fact_prot_reg;
4005         mtd->get_user_prot_info = onenand_get_user_prot_info;
4006         mtd->read_user_prot_reg = onenand_read_user_prot_reg;
4007         mtd->write_user_prot_reg = onenand_write_user_prot_reg;
4008         mtd->lock_user_prot_reg = onenand_lock_user_prot_reg;
4009 #endif
4010         mtd->sync = onenand_sync;
4011         mtd->lock = onenand_lock;
4012         mtd->unlock = onenand_unlock;
4013         mtd->suspend = onenand_suspend;
4014         mtd->resume = onenand_resume;
4015         mtd->block_isbad = onenand_block_isbad;
4016         mtd->block_markbad = onenand_block_markbad;
4017         mtd->owner = THIS_MODULE;
4018
4019         /* Unlock whole block */
4020         this->unlock_all(mtd);
4021
4022         ret = this->scan_bbt(mtd);
4023         if ((!FLEXONENAND(this)) || ret)
4024                 return ret;
4025
4026         /* Change Flex-OneNAND boundaries if required */
4027         for (i = 0; i < MAX_DIES; i++)
4028                 flexonenand_set_boundary(mtd, i, flex_bdry[2 * i],
4029                                                  flex_bdry[(2 * i) + 1]);
4030
4031         return 0;
4032 }
4033
4034 /**
4035  * onenand_release - [OneNAND Interface] Free resources held by the OneNAND device
4036  * @param mtd           MTD device structure
4037  */
4038 void onenand_release(struct mtd_info *mtd)
4039 {
4040         struct onenand_chip *this = mtd->priv;
4041
4042 #ifdef CONFIG_MTD_PARTITIONS
4043         /* Deregister partitions */
4044         del_mtd_partitions (mtd);
4045 #endif
4046         /* Deregister the device */
4047         del_mtd_device (mtd);
4048
4049         /* Free bad block table memory, if allocated */
4050         if (this->bbm) {
4051                 struct bbm_info *bbm = this->bbm;
4052                 kfree(bbm->bbt);
4053                 kfree(this->bbm);
4054         }
4055         /* Buffers allocated by onenand_scan */
4056         if (this->options & ONENAND_PAGEBUF_ALLOC)
4057                 kfree(this->page_buf);
4058         if (this->options & ONENAND_OOBBUF_ALLOC)
4059                 kfree(this->oob_buf);
4060         kfree(mtd->eraseregions);
4061 }
4062
4063 EXPORT_SYMBOL_GPL(onenand_scan);
4064 EXPORT_SYMBOL_GPL(onenand_release);
4065
4066 MODULE_LICENSE("GPL");
4067 MODULE_AUTHOR("Kyungmin Park <kyungmin.park@samsung.com>");
4068 MODULE_DESCRIPTION("Generic OneNAND flash driver code");