drivers/mtd/nand/fsl_elbc_nand.c

   1 /* Freescale Enhanced Local Bus Controller FCM NAND driver
   2  *
   3  * Copyright (c) 2006-2008 Freescale Semiconductor
   4  *
   5  * Authors: Nick Spence <nick.spence@freescale.com>,
   6  *          Scott Wood <scottwood@freescale.com>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 #include <common.h>
  12 #include <malloc.h>
  13 #include <nand.h>
  14
  15 #include <linux/mtd/mtd.h>
  16 #include <linux/mtd/nand.h>
  17 #include <linux/mtd/nand_ecc.h>
  18
  19 #include <asm/io.h>
  20 #include <asm/errno.h>
  21
  22 #ifdef VERBOSE_DEBUG
  23 #define DEBUG_ELBC
  24 #define vdbg(format, arg...) printf("DEBUG: " format, ##arg)
  25 #else
  26 #define vdbg(format, arg...) do {} while (0)
  27 #endif
  28
  29 /* Can't use plain old DEBUG because the linux mtd
  30  * headers define it as a macro.
  31  */
  32 #ifdef DEBUG_ELBC
  33 #define dbg(format, arg...) printf("DEBUG: " format, ##arg)
  34 #else
  35 #define dbg(format, arg...) do {} while (0)
  36 #endif
  37
  38 #define MAX_BANKS 8
  39 #define ERR_BYTE 0xFF /* Value returned for read bytes when read failed */
  40
  41 #define LTESR_NAND_MASK (LTESR_FCT | LTESR_PAR | LTESR_CC)
  42
  43 struct fsl_elbc_ctrl;
  44
  45 /* mtd information per set */
  46
  47 struct fsl_elbc_mtd {
  48         struct nand_chip chip;
  49         struct fsl_elbc_ctrl *ctrl;
  50
  51         struct device *dev;
  52         int bank;               /* Chip select bank number           */
  53         u8 __iomem *vbase;      /* Chip select base virtual address  */
  54         int page_size;          /* NAND page size (0=512, 1=2048)    */
  55         unsigned int fmr;       /* FCM Flash Mode Register value     */
  56 };
  57
  58 /* overview of the fsl elbc controller */
  59
  60 struct fsl_elbc_ctrl {
  61         struct nand_hw_control controller;
  62         struct fsl_elbc_mtd *chips[MAX_BANKS];
  63
  64         /* device info */
  65         fsl_lbc_t *regs;
  66         u8 __iomem *addr;        /* Address of assigned FCM buffer        */
  67         unsigned int page;       /* Last page written to / read from      */
  68         unsigned int read_bytes; /* Number of bytes read during command   */
  69         unsigned int column;     /* Saved column from SEQIN               */
  70         unsigned int index;      /* Pointer to next byte to 'read'        */
  71         unsigned int status;     /* status read from LTESR after last op  */
  72         unsigned int mdr;        /* UPM/FCM Data Register value           */
  73         unsigned int use_mdr;    /* Non zero if the MDR is to be set      */
  74         unsigned int oob;        /* Non zero if operating on OOB data     */
  75 };
  76
  77 /* These map to the positions used by the FCM hardware ECC generator */
  78
  79 /* Small Page FLASH with FMR[ECCM] = 0 */
  80 static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
  81         .eccbytes = 3,
  82         .eccpos = {6, 7, 8},
  83         .oobfree = { {0, 5}, {9, 7} },
  84 };
  85
  86 /* Small Page FLASH with FMR[ECCM] = 1 */
  87 static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
  88         .eccbytes = 3,
  89         .eccpos = {8, 9, 10},
  90         .oobfree = { {0, 5}, {6, 2}, {11, 5} },
  91 };
  92
  93 /* Large Page FLASH with FMR[ECCM] = 0 */
  94 static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
  95         .eccbytes = 12,
  96         .eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
  97         .oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
  98 };
  99
 100 /* Large Page FLASH with FMR[ECCM] = 1 */
 101 static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
 102         .eccbytes = 12,
 103         .eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
 104         .oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
 105 };
 106
 107 /*
 108  * fsl_elbc_oob_lp_eccm* specify that LP NAND's OOB free area starts at offset
 109  * 1, so we have to adjust bad block pattern. This pattern should be used for
 110  * x8 chips only. So far hardware does not support x16 chips anyway.
 111  */
 112 static u8 scan_ff_pattern[] = { 0xff, };
 113
 114 static struct nand_bbt_descr largepage_memorybased = {
 115         .options = 0,
 116         .offs = 0,
 117         .len = 1,
 118         .pattern = scan_ff_pattern,
 119 };
 120
 121 /*
 122  * ELBC may use HW ECC, so that OOB offsets, that NAND core uses for bbt,
 123  * interfere with ECC positions, that's why we implement our own descriptors.
 124  * OOB {11, 5}, works for both SP and LP chips, with ECCM = 1 and ECCM = 0.
 125  */
 126 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
 127 static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };
 128
 129 static struct nand_bbt_descr bbt_main_descr = {
 130         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 131                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 132         .offs = 11,
 133         .len = 4,
 134         .veroffs = 15,
 135         .maxblocks = 4,
 136         .pattern = bbt_pattern,
 137 };
 138
 139 static struct nand_bbt_descr bbt_mirror_descr = {
 140         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 141                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 142         .offs = 11,
 143         .len = 4,
 144         .veroffs = 15,
 145         .maxblocks = 4,
 146         .pattern = mirror_pattern,
 147 };
 148
 149 /*=================================*/
 150
 151 /*
 152  * Set up the FCM hardware block and page address fields, and the fcm
 153  * structure addr field to point to the correct FCM buffer in memory
 154  */
 155 static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
 156 {
 157         struct nand_chip *chip = mtd_to_nand(mtd);
 158         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 159         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 160         fsl_lbc_t *lbc = ctrl->regs;
 161         int buf_num;
 162
 163         ctrl->page = page_addr;
 164
 165         if (priv->page_size) {
 166                 out_be32(&lbc->fbar, page_addr >> 6);
 167                 out_be32(&lbc->fpar,
 168                          ((page_addr << FPAR_LP_PI_SHIFT) & FPAR_LP_PI) |
 169                          (oob ? FPAR_LP_MS : 0) | column);
 170                 buf_num = (page_addr & 1) << 2;
 171         } else {
 172                 out_be32(&lbc->fbar, page_addr >> 5);
 173                 out_be32(&lbc->fpar,
 174                          ((page_addr << FPAR_SP_PI_SHIFT) & FPAR_SP_PI) |
 175                          (oob ? FPAR_SP_MS : 0) | column);
 176                 buf_num = page_addr & 7;
 177         }
 178
 179         ctrl->addr = priv->vbase + buf_num * 1024;
 180         ctrl->index = column;
 181
 182         /* for OOB data point to the second half of the buffer */
 183         if (oob)
 184                 ctrl->index += priv->page_size ? 2048 : 512;
 185
 186         vdbg("set_addr: bank=%d, ctrl->addr=0x%p (0x%p), "
 187              "index %x, pes %d ps %d\n",
 188              buf_num, ctrl->addr, priv->vbase, ctrl->index,
 189              chip->phys_erase_shift, chip->page_shift);
 190 }
 191
 192 /*
 193  * execute FCM command and wait for it to complete
 194  */
 195 static int fsl_elbc_run_command(struct mtd_info *mtd)
 196 {
 197         struct nand_chip *chip = mtd_to_nand(mtd);
 198         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 199         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 200         fsl_lbc_t *lbc = ctrl->regs;
 201         u32 timeo = (CONFIG_SYS_HZ * 10) / 1000;
 202         u32 time_start;
 203         u32 ltesr;
 204
 205         /* Setup the FMR[OP] to execute without write protection */
 206         out_be32(&lbc->fmr, priv->fmr | 3);
 207         if (ctrl->use_mdr)
 208                 out_be32(&lbc->mdr, ctrl->mdr);
 209
 210         vdbg("fsl_elbc_run_command: fmr=%08x fir=%08x fcr=%08x\n",
 211              in_be32(&lbc->fmr), in_be32(&lbc->fir), in_be32(&lbc->fcr));
 212         vdbg("fsl_elbc_run_command: fbar=%08x fpar=%08x "
 213              "fbcr=%08x bank=%d\n",
 214              in_be32(&lbc->fbar), in_be32(&lbc->fpar),
 215              in_be32(&lbc->fbcr), priv->bank);
 216
 217         /* execute special operation */
 218         out_be32(&lbc->lsor, priv->bank);
 219
 220         /* wait for FCM complete flag or timeout */
 221         time_start = get_timer(0);
 222
 223         ltesr = 0;
 224         while (get_timer(time_start) < timeo) {
 225                 ltesr = in_be32(&lbc->ltesr);
 226                 if (ltesr & LTESR_CC)
 227                         break;
 228         }
 229
 230         ctrl->status = ltesr & LTESR_NAND_MASK;
 231         out_be32(&lbc->ltesr, ctrl->status);
 232         out_be32(&lbc->lteatr, 0);
 233
 234         /* store mdr value in case it was needed */
 235         if (ctrl->use_mdr)
 236                 ctrl->mdr = in_be32(&lbc->mdr);
 237
 238         ctrl->use_mdr = 0;
 239
 240         vdbg("fsl_elbc_run_command: stat=%08x mdr=%08x fmr=%08x\n",
 241              ctrl->status, ctrl->mdr, in_be32(&lbc->fmr));
 242
 243         /* returns 0 on success otherwise non-zero) */
 244         return ctrl->status == LTESR_CC ? 0 : -EIO;
 245 }
 246
 247 static void fsl_elbc_do_read(struct nand_chip *chip, int oob)
 248 {
 249         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 250         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 251         fsl_lbc_t *lbc = ctrl->regs;
 252
 253         if (priv->page_size) {
 254                 out_be32(&lbc->fir,
 255                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 256                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
 257                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
 258                          (FIR_OP_CW1 << FIR_OP3_SHIFT) |
 259                          (FIR_OP_RBW << FIR_OP4_SHIFT));
 260
 261                 out_be32(&lbc->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
 262                                     (NAND_CMD_READSTART << FCR_CMD1_SHIFT));
 263         } else {
 264                 out_be32(&lbc->fir,
 265                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 266                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
 267                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
 268                          (FIR_OP_RBW << FIR_OP3_SHIFT));
 269
 270                 if (oob)
 271                         out_be32(&lbc->fcr,
 272                                  NAND_CMD_READOOB << FCR_CMD0_SHIFT);
 273                 else
 274                         out_be32(&lbc->fcr, NAND_CMD_READ0 << FCR_CMD0_SHIFT);
 275         }
 276 }
 277
 278 /* cmdfunc send commands to the FCM */
 279 static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 280                              int column, int page_addr)
 281 {
 282         struct nand_chip *chip = mtd_to_nand(mtd);
 283         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 284         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 285         fsl_lbc_t *lbc = ctrl->regs;
 286
 287         ctrl->use_mdr = 0;
 288
 289         /* clear the read buffer */
 290         ctrl->read_bytes = 0;
 291         if (command != NAND_CMD_PAGEPROG)
 292                 ctrl->index = 0;
 293
 294         switch (command) {
 295         /* READ0 and READ1 read the entire buffer to use hardware ECC. */
 296         case NAND_CMD_READ1:
 297                 column += 256;
 298
 299         /* fall-through */
 300         case NAND_CMD_READ0:
 301                 vdbg("fsl_elbc_cmdfunc: NAND_CMD_READ0, page_addr:"
 302                      " 0x%x, column: 0x%x.\n", page_addr, column);
 303
 304                 out_be32(&lbc->fbcr, 0); /* read entire page to enable ECC */
 305                 set_addr(mtd, 0, page_addr, 0);
 306
 307                 ctrl->read_bytes = mtd->writesize + mtd->oobsize;
 308                 ctrl->index += column;
 309
 310                 fsl_elbc_do_read(chip, 0);
 311                 fsl_elbc_run_command(mtd);
 312                 return;
 313
 314         /* READOOB reads only the OOB because no ECC is performed. */
 315         case NAND_CMD_READOOB:
 316                 vdbg("fsl_elbc_cmdfunc: NAND_CMD_READOOB, page_addr:"
 317                      " 0x%x, column: 0x%x.\n", page_addr, column);
 318
 319                 out_be32(&lbc->fbcr, mtd->oobsize - column);
 320                 set_addr(mtd, column, page_addr, 1);
 321
 322                 ctrl->read_bytes = mtd->writesize + mtd->oobsize;
 323
 324                 fsl_elbc_do_read(chip, 1);
 325                 fsl_elbc_run_command(mtd);
 326
 327                 return;
 328
 329         /* READID must read all 5 possible bytes while CEB is active */
 330         case NAND_CMD_READID:
 331         case NAND_CMD_PARAM:
 332                 vdbg("fsl_elbc_cmdfunc: NAND_CMD 0x%x.\n", command);
 333
 334                 out_be32(&lbc->fir, (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 335                                     (FIR_OP_UA  << FIR_OP1_SHIFT) |
 336                                     (FIR_OP_RBW << FIR_OP2_SHIFT));
 337                 out_be32(&lbc->fcr, command << FCR_CMD0_SHIFT);
 338                 /*
 339                  * although currently it's 8 bytes for READID, we always read
 340                  * the maximum 256 bytes(for PARAM)
 341                  */
 342                 out_be32(&lbc->fbcr, 256);
 343                 ctrl->read_bytes = 256;
 344                 ctrl->use_mdr = 1;
 345                 ctrl->mdr = column;
 346                 set_addr(mtd, 0, 0, 0);
 347                 fsl_elbc_run_command(mtd);
 348                 return;
 349
 350         /* ERASE1 stores the block and page address */
 351         case NAND_CMD_ERASE1:
 352                 vdbg("fsl_elbc_cmdfunc: NAND_CMD_ERASE1, "
 353                      "page_addr: 0x%x.\n", page_addr);
 354                 set_addr(mtd, 0, page_addr, 0);
 355                 return;
 356
 357         /* ERASE2 uses the block and page address from ERASE1 */
 358         case NAND_CMD_ERASE2:
 359                 vdbg("fsl_elbc_cmdfunc: NAND_CMD_ERASE2.\n");
 360
 361                 out_be32(&lbc->fir,
 362                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 363                          (FIR_OP_PA  << FIR_OP1_SHIFT) |
 364                          (FIR_OP_CM1 << FIR_OP2_SHIFT));
 365
 366                 out_be32(&lbc->fcr,
 367                          (NAND_CMD_ERASE1 << FCR_CMD0_SHIFT) |
 368                          (NAND_CMD_ERASE2 << FCR_CMD1_SHIFT));
 369
 370                 out_be32(&lbc->fbcr, 0);
 371                 ctrl->read_bytes = 0;
 372
 373                 fsl_elbc_run_command(mtd);
 374                 return;
 375
 376         /* SEQIN sets up the addr buffer and all registers except the length */
 377         case NAND_CMD_SEQIN: {
 378                 u32 fcr;
 379                 vdbg("fsl_elbc_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG, "
 380                      "page_addr: 0x%x, column: 0x%x.\n",
 381                      page_addr, column);
 382
 383                 ctrl->column = column;
 384                 ctrl->oob = 0;
 385
 386                 if (priv->page_size) {
 387                         fcr = (NAND_CMD_SEQIN << FCR_CMD0_SHIFT) |
 388                               (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT);
 389
 390                         out_be32(&lbc->fir,
 391                                  (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 392                                  (FIR_OP_CA  << FIR_OP1_SHIFT) |
 393                                  (FIR_OP_PA  << FIR_OP2_SHIFT) |
 394                                  (FIR_OP_WB  << FIR_OP3_SHIFT) |
 395                                  (FIR_OP_CW1 << FIR_OP4_SHIFT));
 396                 } else {
 397                         fcr = (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT) |
 398                               (NAND_CMD_SEQIN << FCR_CMD2_SHIFT);
 399
 400                         out_be32(&lbc->fir,
 401                                  (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 402                                  (FIR_OP_CM2 << FIR_OP1_SHIFT) |
 403                                  (FIR_OP_CA  << FIR_OP2_SHIFT) |
 404                                  (FIR_OP_PA  << FIR_OP3_SHIFT) |
 405                                  (FIR_OP_WB  << FIR_OP4_SHIFT) |
 406                                  (FIR_OP_CW1 << FIR_OP5_SHIFT));
 407
 408                         if (column >= mtd->writesize) {
 409                                 /* OOB area --> READOOB */
 410                                 column -= mtd->writesize;
 411                                 fcr |= NAND_CMD_READOOB << FCR_CMD0_SHIFT;
 412                                 ctrl->oob = 1;
 413                         } else if (column < 256) {
 414                                 /* First 256 bytes --> READ0 */
 415                                 fcr |= NAND_CMD_READ0 << FCR_CMD0_SHIFT;
 416                         } else {
 417                                 /* Second 256 bytes --> READ1 */
 418                                 fcr |= NAND_CMD_READ1 << FCR_CMD0_SHIFT;
 419                         }
 420                 }
 421
 422                 out_be32(&lbc->fcr, fcr);
 423                 set_addr(mtd, column, page_addr, ctrl->oob);
 424                 return;
 425         }
 426
 427         /* PAGEPROG reuses all of the setup from SEQIN and adds the length */
 428         case NAND_CMD_PAGEPROG: {
 429                 vdbg("fsl_elbc_cmdfunc: NAND_CMD_PAGEPROG "
 430                      "writing %d bytes.\n", ctrl->index);
 431
 432                 /* if the write did not start at 0 or is not a full page
 433                  * then set the exact length, otherwise use a full page
 434                  * write so the HW generates the ECC.
 435                  */
 436                 if (ctrl->oob || ctrl->column != 0 ||
 437                     ctrl->index != mtd->writesize + mtd->oobsize)
 438                         out_be32(&lbc->fbcr, ctrl->index);
 439                 else
 440                         out_be32(&lbc->fbcr, 0);
 441
 442                 fsl_elbc_run_command(mtd);
 443
 444                 return;
 445         }
 446
 447         /* CMD_STATUS must read the status byte while CEB is active */
 448         /* Note - it does not wait for the ready line */
 449         case NAND_CMD_STATUS:
 450                 out_be32(&lbc->fir,
 451                          (FIR_OP_CM0 << FIR_OP0_SHIFT) |
 452                          (FIR_OP_RBW << FIR_OP1_SHIFT));
 453                 out_be32(&lbc->fcr, NAND_CMD_STATUS << FCR_CMD0_SHIFT);
 454                 out_be32(&lbc->fbcr, 1);
 455                 set_addr(mtd, 0, 0, 0);
 456                 ctrl->read_bytes = 1;
 457
 458                 fsl_elbc_run_command(mtd);
 459
 460                 /* The chip always seems to report that it is
 461                  * write-protected, even when it is not.
 462                  */
 463                 out_8(ctrl->addr, in_8(ctrl->addr) | NAND_STATUS_WP);
 464                 return;
 465
 466         /* RESET without waiting for the ready line */
 467         case NAND_CMD_RESET:
 468                 dbg("fsl_elbc_cmdfunc: NAND_CMD_RESET.\n");
 469                 out_be32(&lbc->fir, FIR_OP_CM0 << FIR_OP0_SHIFT);
 470                 out_be32(&lbc->fcr, NAND_CMD_RESET << FCR_CMD0_SHIFT);
 471                 fsl_elbc_run_command(mtd);
 472                 return;
 473
 474         default:
 475                 printf("fsl_elbc_cmdfunc: error, unsupported command 0x%x.\n",
 476                         command);
 477         }
 478 }
 479
 480 static void fsl_elbc_select_chip(struct mtd_info *mtd, int chip)
 481 {
 482         /* The hardware does not seem to support multiple
 483          * chips per bank.
 484          */
 485 }
 486
 487 /*
 488  * Write buf to the FCM Controller Data Buffer
 489  */
 490 static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 491 {
 492         struct nand_chip *chip = mtd_to_nand(mtd);
 493         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 494         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 495         unsigned int bufsize = mtd->writesize + mtd->oobsize;
 496
 497         if (len <= 0) {
 498                 printf("write_buf of %d bytes", len);
 499                 ctrl->status = 0;
 500                 return;
 501         }
 502
 503         if ((unsigned int)len > bufsize - ctrl->index) {
 504                 printf("write_buf beyond end of buffer "
 505                        "(%d requested, %u available)\n",
 506                        len, bufsize - ctrl->index);
 507                 len = bufsize - ctrl->index;
 508         }
 509
 510         memcpy_toio(&ctrl->addr[ctrl->index], buf, len);
 511         /*
 512          * This is workaround for the weird elbc hangs during nand write,
 513          * Scott Wood says: "...perhaps difference in how long it takes a
 514          * write to make it through the localbus compared to a write to IMMR
 515          * is causing problems, and sync isn't helping for some reason."
 516          * Reading back the last byte helps though.
 517          */
 518         in_8(&ctrl->addr[ctrl->index] + len - 1);
 519
 520         ctrl->index += len;
 521 }
 522
 523 /*
 524  * read a byte from either the FCM hardware buffer if it has any data left
 525  * otherwise issue a command to read a single byte.
 526  */
 527 static u8 fsl_elbc_read_byte(struct mtd_info *mtd)
 528 {
 529         struct nand_chip *chip = mtd_to_nand(mtd);
 530         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 531         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 532
 533         /* If there are still bytes in the FCM, then use the next byte. */
 534         if (ctrl->index < ctrl->read_bytes)
 535                 return in_8(&ctrl->addr[ctrl->index++]);
 536
 537         printf("read_byte beyond end of buffer\n");
 538         return ERR_BYTE;
 539 }
 540
 541 /*
 542  * Read from the FCM Controller Data Buffer
 543  */
 544 static void fsl_elbc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 545 {
 546         struct nand_chip *chip = mtd_to_nand(mtd);
 547         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 548         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 549         int avail;
 550
 551         if (len < 0)
 552                 return;
 553
 554         avail = min((unsigned int)len, ctrl->read_bytes - ctrl->index);
 555         memcpy_fromio(buf, &ctrl->addr[ctrl->index], avail);
 556         ctrl->index += avail;
 557
 558         if (len > avail)
 559                 printf("read_buf beyond end of buffer "
 560                        "(%d requested, %d available)\n",
 561                        len, avail);
 562 }
 563
 564 /* This function is called after Program and Erase Operations to
 565  * check for success or failure.
 566  */
 567 static int fsl_elbc_wait(struct mtd_info *mtd, struct nand_chip *chip)
 568 {
 569         struct fsl_elbc_mtd *priv = nand_get_controller_data(chip);
 570         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 571         fsl_lbc_t *lbc = ctrl->regs;
 572
 573         if (ctrl->status != LTESR_CC)
 574                 return NAND_STATUS_FAIL;
 575
 576         /* Use READ_STATUS command, but wait for the device to be ready */
 577         ctrl->use_mdr = 0;
 578         out_be32(&lbc->fir,
 579                  (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 580                  (FIR_OP_RBW << FIR_OP1_SHIFT));
 581         out_be32(&lbc->fcr, NAND_CMD_STATUS << FCR_CMD0_SHIFT);
 582         out_be32(&lbc->fbcr, 1);
 583         set_addr(mtd, 0, 0, 0);
 584         ctrl->read_bytes = 1;
 585
 586         fsl_elbc_run_command(mtd);
 587
 588         if (ctrl->status != LTESR_CC)
 589                 return NAND_STATUS_FAIL;
 590
 591         /* The chip always seems to report that it is
 592          * write-protected, even when it is not.
 593          */
 594         out_8(ctrl->addr, in_8(ctrl->addr) | NAND_STATUS_WP);
 595         return fsl_elbc_read_byte(mtd);
 596 }
 597
 598 static int fsl_elbc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 599                               uint8_t *buf, int oob_required, int page)
 600 {
 601         fsl_elbc_read_buf(mtd, buf, mtd->writesize);
 602         fsl_elbc_read_buf(mtd, chip->oob_poi, mtd->oobsize);
 603
 604         if (fsl_elbc_wait(mtd, chip) & NAND_STATUS_FAIL)
 605                 mtd->ecc_stats.failed++;
 606
 607         return 0;
 608 }
 609
 610 /* ECC will be calculated automatically, and errors will be detected in
 611  * waitfunc.
 612  */
 613 static int fsl_elbc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 614                                 const uint8_t *buf, int oob_required,
 615                                 int page)
 616 {
 617         fsl_elbc_write_buf(mtd, buf, mtd->writesize);
 618         fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
 619
 620         return 0;
 621 }
 622
 623 static struct fsl_elbc_ctrl *elbc_ctrl;
 624
 625 /* ECC will be calculated automatically, and errors will be detected in
 626  * waitfunc.
 627  */
 628 static int fsl_elbc_write_subpage(struct mtd_info *mtd, struct nand_chip *chip,
 629                                 uint32_t offset, uint32_t data_len,
 630                                 const uint8_t *buf, int oob_required, int page)
 631 {
 632         fsl_elbc_write_buf(mtd, buf, mtd->writesize);
 633         fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
 634
 635         return 0;
 636 }
 637
 638 static void fsl_elbc_ctrl_init(void)
 639 {
 640         elbc_ctrl = kzalloc(sizeof(*elbc_ctrl), GFP_KERNEL);
 641         if (!elbc_ctrl)
 642                 return;
 643
 644         elbc_ctrl->regs = LBC_BASE_ADDR;
 645
 646         /* clear event registers */
 647         out_be32(&elbc_ctrl->regs->ltesr, LTESR_NAND_MASK);
 648         out_be32(&elbc_ctrl->regs->lteatr, 0);
 649
 650         /* Enable interrupts for any detected events */
 651         out_be32(&elbc_ctrl->regs->lteir, LTESR_NAND_MASK);
 652
 653         elbc_ctrl->read_bytes = 0;
 654         elbc_ctrl->index = 0;
 655         elbc_ctrl->addr = NULL;
 656 }
 657
 658 static int fsl_elbc_chip_init(int devnum, u8 *addr)
 659 {
 660         struct mtd_info *mtd;
 661         struct nand_chip *nand;
 662         struct fsl_elbc_mtd *priv;
 663         uint32_t br = 0, or = 0;
 664         int ret;
 665
 666         if (!elbc_ctrl) {
 667                 fsl_elbc_ctrl_init();
 668                 if (!elbc_ctrl)
 669                         return -1;
 670         }
 671
 672         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 673         if (!priv)
 674                 return -ENOMEM;
 675
 676         priv->ctrl = elbc_ctrl;
 677         priv->vbase = addr;
 678
 679         /* Find which chip select it is connected to.  It'd be nice
 680          * if we could pass more than one datum to the NAND driver...
 681          */
 682         for (priv->bank = 0; priv->bank < MAX_BANKS; priv->bank++) {
 683                 phys_addr_t phys_addr = virt_to_phys(addr);
 684
 685                 br = in_be32(&elbc_ctrl->regs->bank[priv->bank].br);
 686                 or = in_be32(&elbc_ctrl->regs->bank[priv->bank].or);
 687
 688                 if ((br & BR_V) && (br & BR_MSEL) == BR_MS_FCM &&
 689                     (br & or & BR_BA) == BR_PHYS_ADDR(phys_addr))
 690                         break;
 691         }
 692
 693         if (priv->bank >= MAX_BANKS) {
 694                 printf("fsl_elbc_nand: address did not match any "
 695                        "chip selects\n");
 696                 kfree(priv);
 697                 return -ENODEV;
 698         }
 699
 700         nand = &priv->chip;
 701         mtd = nand_to_mtd(nand);
 702
 703         elbc_ctrl->chips[priv->bank] = priv;
 704
 705         /* fill in nand_chip structure */
 706         /* set up function call table */
 707         nand->read_byte = fsl_elbc_read_byte;
 708         nand->write_buf = fsl_elbc_write_buf;
 709         nand->read_buf = fsl_elbc_read_buf;
 710         nand->select_chip = fsl_elbc_select_chip;
 711         nand->cmdfunc = fsl_elbc_cmdfunc;
 712         nand->waitfunc = fsl_elbc_wait;
 713
 714         /* set up nand options */
 715         nand->bbt_td = &bbt_main_descr;
 716         nand->bbt_md = &bbt_mirror_descr;
 717
 718         /* set up nand options */
 719         nand->options = NAND_NO_SUBPAGE_WRITE;
 720         nand->bbt_options = NAND_BBT_USE_FLASH;
 721
 722         nand->controller = &elbc_ctrl->controller;
 723         nand_set_controller_data(nand, priv);
 724
 725         nand->ecc.read_page = fsl_elbc_read_page;
 726         nand->ecc.write_page = fsl_elbc_write_page;
 727         nand->ecc.write_subpage = fsl_elbc_write_subpage;
 728
 729         priv->fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT);
 730
 731         /* If CS Base Register selects full hardware ECC then use it */
 732         if ((br & BR_DECC) == BR_DECC_CHK_GEN) {
 733                 nand->ecc.mode = NAND_ECC_HW;
 734
 735                 nand->ecc.layout = (priv->fmr & FMR_ECCM) ?
 736                                    &fsl_elbc_oob_sp_eccm1 :
 737                                    &fsl_elbc_oob_sp_eccm0;
 738
 739                 nand->ecc.size = 512;
 740                 nand->ecc.bytes = 3;
 741                 nand->ecc.steps = 1;
 742                 nand->ecc.strength = 1;
 743         } else {
 744                 /* otherwise fall back to software ECC */
 745 #if defined(CONFIG_NAND_ECC_BCH)
 746                 nand->ecc.mode = NAND_ECC_SOFT_BCH;
 747 #else
 748                 nand->ecc.mode = NAND_ECC_SOFT;
 749 #endif
 750         }
 751
 752         ret = nand_scan_ident(mtd, 1, NULL);
 753         if (ret)
 754                 return ret;
 755
 756         /* Large-page-specific setup */
 757         if (mtd->writesize == 2048) {
 758                 setbits_be32(&elbc_ctrl->regs->bank[priv->bank].or,
 759                              OR_FCM_PGS);
 760                 in_be32(&elbc_ctrl->regs->bank[priv->bank].or);
 761
 762                 priv->page_size = 1;
 763                 nand->badblock_pattern = &largepage_memorybased;
 764
 765                 /*
 766                  * Hardware expects small page has ECCM0, large page has
 767                  * ECCM1 when booting from NAND, and we follow that even
 768                  * when not booting from NAND.
 769                  */
 770                 priv->fmr |= FMR_ECCM;
 771
 772                 /* adjust ecc setup if needed */
 773                 if ((br & BR_DECC) == BR_DECC_CHK_GEN) {
 774                         nand->ecc.steps = 4;
 775                         nand->ecc.layout = (priv->fmr & FMR_ECCM) ?
 776                                            &fsl_elbc_oob_lp_eccm1 :
 777                                            &fsl_elbc_oob_lp_eccm0;
 778                 }
 779         } else if (mtd->writesize == 512) {
 780                 clrbits_be32(&elbc_ctrl->regs->bank[priv->bank].or,
 781                              OR_FCM_PGS);
 782                 in_be32(&elbc_ctrl->regs->bank[priv->bank].or);
 783         } else {
 784                 return -ENODEV;
 785         }
 786
 787         ret = nand_scan_tail(mtd);
 788         if (ret)
 789                 return ret;
 790
 791         ret = nand_register(devnum, mtd);
 792         if (ret)
 793                 return ret;
 794
 795         return 0;
 796 }
 797
 798 #ifndef CONFIG_SYS_NAND_BASE_LIST
 799 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
 800 #endif
 801
 802 static unsigned long base_address[CONFIG_SYS_MAX_NAND_DEVICE] =
 803         CONFIG_SYS_NAND_BASE_LIST;
 804
 805 void board_nand_init(void)
 806 {
 807         int i;
 808
 809         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
 810                 fsl_elbc_chip_init(i, (u8 *)base_address[i]);
 811 }