git.oblomov.eu Git - linux-2.6/blob - drivers/mtd/nand/fsl_elbc_nand.c

   1 /* Freescale Enhanced Local Bus Controller NAND driver
   2  *
   3  * Copyright (c) 2006-2007 Freescale Semiconductor
   4  *
   5  * Authors: Nick Spence <nick.spence@freescale.com>,
   6  *          Scott Wood <scottwood@freescale.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/init.h>
  26 #include <linux/kernel.h>
  27 #include <linux/string.h>
  28 #include <linux/ioport.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/slab.h>
  31 #include <linux/interrupt.h>
  32
  33 #include <linux/mtd/mtd.h>
  34 #include <linux/mtd/nand.h>
  35 #include <linux/mtd/nand_ecc.h>
  36 #include <linux/mtd/partitions.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/fsl_lbc.h>
  40
  41 #define MAX_BANKS 8
  42 #define ERR_BYTE 0xFF /* Value returned for read bytes when read failed */
  43 #define FCM_TIMEOUT_MSECS 500 /* Maximum number of mSecs to wait for FCM */
  44
  45 struct fsl_elbc_ctrl;
  46
  47 /* mtd information per set */
  48
  49 struct fsl_elbc_mtd {
  50         struct mtd_info mtd;
  51         struct nand_chip chip;
  52         struct fsl_elbc_ctrl *ctrl;
  53
  54         struct device *dev;
  55         int bank;               /* Chip select bank number           */
  56         u8 __iomem *vbase;      /* Chip select base virtual address  */
  57         int page_size;          /* NAND page size (0=512, 1=2048)    */
  58         unsigned int fmr;       /* FCM Flash Mode Register value     */
  59 };
  60
  61 /* overview of the fsl elbc controller */
  62
  63 struct fsl_elbc_ctrl {
  64         struct nand_hw_control controller;
  65         struct fsl_elbc_mtd *chips[MAX_BANKS];
  66
  67         /* device info */
  68         struct device *dev;
  69         struct fsl_lbc_regs __iomem *regs;
  70         int irq;
  71         wait_queue_head_t irq_wait;
  72         unsigned int irq_status; /* status read from LTESR by irq handler */
  73         u8 __iomem *addr;        /* Address of assigned FCM buffer        */
  74         unsigned int page;       /* Last page written to / read from      */
  75         unsigned int read_bytes; /* Number of bytes read during command   */
  76         unsigned int column;     /* Saved column from SEQIN               */
  77         unsigned int index;      /* Pointer to next byte to 'read'        */
  78         unsigned int status;     /* status read from LTESR after last op  */
  79         unsigned int mdr;        /* UPM/FCM Data Register value           */
  80         unsigned int use_mdr;    /* Non zero if the MDR is to be set      */
  81         unsigned int oob;        /* Non zero if operating on OOB data     */
  82         char *oob_poi;           /* Place to write ECC after read back    */
  83 };
  84
  85 /* These map to the positions used by the FCM hardware ECC generator */
  86
  87 /* Small Page FLASH with FMR[ECCM] = 0 */
  88 static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
  89         .eccbytes = 3,
  90         .eccpos = {6, 7, 8},
  91         .oobfree = { {0, 5}, {9, 7} },
  92 };
  93
  94 /* Small Page FLASH with FMR[ECCM] = 1 */
  95 static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
  96         .eccbytes = 3,
  97         .eccpos = {8, 9, 10},
  98         .oobfree = { {0, 5}, {6, 2}, {11, 5} },
  99 };
 100
 101 /* Large Page FLASH with FMR[ECCM] = 0 */
 102 static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
 103         .eccbytes = 12,
 104         .eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
 105         .oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
 106 };
 107
 108 /* Large Page FLASH with FMR[ECCM] = 1 */
 109 static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
 110         .eccbytes = 12,
 111         .eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
 112         .oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
 113 };
 114
 115 /*
 116  * fsl_elbc_oob_lp_eccm* specify that LP NAND's OOB free area starts at offset
 117  * 1, so we have to adjust bad block pattern. This pattern should be used for
 118  * x8 chips only. So far hardware does not support x16 chips anyway.
 119  */
 120 static u8 scan_ff_pattern[] = { 0xff, };
 121
 122 static struct nand_bbt_descr largepage_memorybased = {
 123         .options = 0,
 124         .offs = 0,
 125         .len = 1,
 126         .pattern = scan_ff_pattern,
 127 };
 128
 129 /*
 130  * ELBC may use HW ECC, so that OOB offsets, that NAND core uses for bbt,
 131  * interfere with ECC positions, that's why we implement our own descriptors.
 132  * OOB {11, 5}, works for both SP and LP chips, with ECCM = 1 and ECCM = 0.
 133  */
 134 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
 135 static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };
 136
 137 static struct nand_bbt_descr bbt_main_descr = {
 138         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 139                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 140         .offs = 11,
 141         .len = 4,
 142         .veroffs = 15,
 143         .maxblocks = 4,
 144         .pattern = bbt_pattern,
 145 };
 146
 147 static struct nand_bbt_descr bbt_mirror_descr = {
 148         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 149                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 150         .offs = 11,
 151         .len = 4,
 152         .veroffs = 15,
 153         .maxblocks = 4,
 154         .pattern = mirror_pattern,
 155 };
 156
 157 /*=================================*/
 158
 159 /*
 160  * Set up the FCM hardware block and page address fields, and the fcm
 161  * structure addr field to point to the correct FCM buffer in memory
 162  */
 163 static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
 164 {
 165         struct nand_chip *chip = mtd->priv;
 166         struct fsl_elbc_mtd *priv = chip->priv;
 167         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 168         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 169         int buf_num;
 170
 171         ctrl->page = page_addr;
 172
 173         out_be32(&lbc->fbar,
 174                  page_addr >> (chip->phys_erase_shift - chip->page_shift));
 175
 176         if (priv->page_size) {
 177                 out_be32(&lbc->fpar,
 178                          ((page_addr << FPAR_LP_PI_SHIFT) & FPAR_LP_PI) |
 179                          (oob ? FPAR_LP_MS : 0) | column);
 180                 buf_num = (page_addr & 1) << 2;
 181         } else {
 182                 out_be32(&lbc->fpar,
 183                          ((page_addr << FPAR_SP_PI_SHIFT) & FPAR_SP_PI) |
 184                          (oob ? FPAR_SP_MS : 0) | column);
 185                 buf_num = page_addr & 7;
 186         }
 187
 188         ctrl->addr = priv->vbase + buf_num * 1024;
 189         ctrl->index = column;
 190
 191         /* for OOB data point to the second half of the buffer */
 192         if (oob)
 193                 ctrl->index += priv->page_size ? 2048 : 512;
 194
 195         dev_vdbg(ctrl->dev, "set_addr: bank=%d, ctrl->addr=0x%p (0x%p), "
 196                             "index %x, pes %d ps %d\n",
 197                  buf_num, ctrl->addr, priv->vbase, ctrl->index,
 198                  chip->phys_erase_shift, chip->page_shift);
 199 }
 200
 201 /*
 202  * execute FCM command and wait for it to complete
 203  */
 204 static int fsl_elbc_run_command(struct mtd_info *mtd)
 205 {
 206         struct nand_chip *chip = mtd->priv;
 207         struct fsl_elbc_mtd *priv = chip->priv;
 208         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 209         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 210
 211         /* Setup the FMR[OP] to execute without write protection */
 212         out_be32(&lbc->fmr, priv->fmr | 3);
 213         if (ctrl->use_mdr)
 214                 out_be32(&lbc->mdr, ctrl->mdr);
 215
 216         dev_vdbg(ctrl->dev,
 217                  "fsl_elbc_run_command: fmr=%08x fir=%08x fcr=%08x\n",
 218                  in_be32(&lbc->fmr), in_be32(&lbc->fir), in_be32(&lbc->fcr));
 219         dev_vdbg(ctrl->dev,
 220                  "fsl_elbc_run_command: fbar=%08x fpar=%08x "
 221                  "fbcr=%08x bank=%d\n",
 222                  in_be32(&lbc->fbar), in_be32(&lbc->fpar),
 223                  in_be32(&lbc->fbcr), priv->bank);
 224
 225         ctrl->irq_status = 0;
 226         /* execute special operation */
 227         out_be32(&lbc->lsor, priv->bank);
 228
 229         /* wait for FCM complete flag or timeout */
 230         wait_event_timeout(ctrl->irq_wait, ctrl->irq_status,
 231                            FCM_TIMEOUT_MSECS * HZ/1000);
 232         ctrl->status = ctrl->irq_status;
 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         dev_vdbg(ctrl->dev,
 241                  "fsl_elbc_run_command: stat=%08x mdr=%08x fmr=%08x\n",
 242                  ctrl->status, ctrl->mdr, in_be32(&lbc->fmr));
 243
 244         /* returns 0 on success otherwise non-zero) */
 245         return ctrl->status == LTESR_CC ? 0 : -EIO;
 246 }
 247
 248 static void fsl_elbc_do_read(struct nand_chip *chip, int oob)
 249 {
 250         struct fsl_elbc_mtd *priv = chip->priv;
 251         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 252         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 253
 254         if (priv->page_size) {
 255                 out_be32(&lbc->fir,
 256                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 257                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
 258                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
 259                          (FIR_OP_CW1 << FIR_OP3_SHIFT) |
 260                          (FIR_OP_RBW << FIR_OP4_SHIFT));
 261
 262                 out_be32(&lbc->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
 263                                     (NAND_CMD_READSTART << FCR_CMD1_SHIFT));
 264         } else {
 265                 out_be32(&lbc->fir,
 266                          (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 267                          (FIR_OP_CA  << FIR_OP1_SHIFT) |
 268                          (FIR_OP_PA  << FIR_OP2_SHIFT) |
 269                          (FIR_OP_RBW << FIR_OP3_SHIFT));
 270
 271                 if (oob)
 272                         out_be32(&lbc->fcr, 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->priv;
 283         struct fsl_elbc_mtd *priv = chip->priv;
 284         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 285         struct fsl_lbc_regs __iomem *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                 dev_dbg(ctrl->dev,
 302                         "fsl_elbc_cmdfunc: NAND_CMD_READ0, page_addr:"
 303                         " 0x%x, column: 0x%x.\n", page_addr, column);
 304
 305
 306                 out_be32(&lbc->fbcr, 0); /* read entire page to enable ECC */
 307                 set_addr(mtd, 0, page_addr, 0);
 308
 309                 ctrl->read_bytes = mtd->writesize + mtd->oobsize;
 310                 ctrl->index += column;
 311
 312                 fsl_elbc_do_read(chip, 0);
 313                 fsl_elbc_run_command(mtd);
 314                 return;
 315
 316         /* READOOB reads only the OOB because no ECC is performed. */
 317         case NAND_CMD_READOOB:
 318                 dev_vdbg(ctrl->dev,
 319                          "fsl_elbc_cmdfunc: NAND_CMD_READOOB, page_addr:"
 320                          " 0x%x, column: 0x%x.\n", page_addr, column);
 321
 322                 out_be32(&lbc->fbcr, mtd->oobsize - column);
 323                 set_addr(mtd, column, page_addr, 1);
 324
 325                 ctrl->read_bytes = mtd->writesize + mtd->oobsize;
 326
 327                 fsl_elbc_do_read(chip, 1);
 328                 fsl_elbc_run_command(mtd);
 329                 return;
 330
 331         /* READID must read all 5 possible bytes while CEB is active */
 332         case NAND_CMD_READID:
 333                 dev_vdbg(ctrl->dev, "fsl_elbc_cmdfunc: NAND_CMD_READID.\n");
 334
 335                 out_be32(&lbc->fir, (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 336                                     (FIR_OP_UA  << FIR_OP1_SHIFT) |
 337                                     (FIR_OP_RBW << FIR_OP2_SHIFT));
 338                 out_be32(&lbc->fcr, NAND_CMD_READID << FCR_CMD0_SHIFT);
 339                 /* 5 bytes for manuf, device and exts */
 340                 out_be32(&lbc->fbcr, 5);
 341                 ctrl->read_bytes = 5;
 342                 ctrl->use_mdr = 1;
 343                 ctrl->mdr = 0;
 344
 345                 set_addr(mtd, 0, 0, 0);
 346                 fsl_elbc_run_command(mtd);
 347                 return;
 348
 349         /* ERASE1 stores the block and page address */
 350         case NAND_CMD_ERASE1:
 351                 dev_vdbg(ctrl->dev,
 352                          "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                 dev_vdbg(ctrl->dev, "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                 __be32 fcr;
 379                 dev_vdbg(ctrl->dev,
 380                          "fsl_elbc_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG, "
 381                          "page_addr: 0x%x, column: 0x%x.\n",
 382                          page_addr, column);
 383
 384                 ctrl->column = column;
 385                 ctrl->oob = 0;
 386
 387                 if (priv->page_size) {
 388                         fcr = (NAND_CMD_SEQIN << FCR_CMD0_SHIFT) |
 389                               (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT);
 390
 391                         out_be32(&lbc->fir,
 392                                  (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 393                                  (FIR_OP_CA  << FIR_OP1_SHIFT) |
 394                                  (FIR_OP_PA  << FIR_OP2_SHIFT) |
 395                                  (FIR_OP_WB  << FIR_OP3_SHIFT) |
 396                                  (FIR_OP_CW1 << FIR_OP4_SHIFT));
 397                 } else {
 398                         fcr = (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT) |
 399                               (NAND_CMD_SEQIN << FCR_CMD2_SHIFT);
 400
 401                         out_be32(&lbc->fir,
 402                                  (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 403                                  (FIR_OP_CM2 << FIR_OP1_SHIFT) |
 404                                  (FIR_OP_CA  << FIR_OP2_SHIFT) |
 405                                  (FIR_OP_PA  << FIR_OP3_SHIFT) |
 406                                  (FIR_OP_WB  << FIR_OP4_SHIFT) |
 407                                  (FIR_OP_CW1 << FIR_OP5_SHIFT));
 408
 409                         if (column >= mtd->writesize) {
 410                                 /* OOB area --> READOOB */
 411                                 column -= mtd->writesize;
 412                                 fcr |= NAND_CMD_READOOB << FCR_CMD0_SHIFT;
 413                                 ctrl->oob = 1;
 414                         } else if (column < 256) {
 415                                 /* First 256 bytes --> READ0 */
 416                                 fcr |= NAND_CMD_READ0 << FCR_CMD0_SHIFT;
 417                         } else {
 418                                 /* Second 256 bytes --> READ1 */
 419                                 fcr |= NAND_CMD_READ1 << FCR_CMD0_SHIFT;
 420                         }
 421                 }
 422
 423                 out_be32(&lbc->fcr, fcr);
 424                 set_addr(mtd, column, page_addr, ctrl->oob);
 425                 return;
 426         }
 427
 428         /* PAGEPROG reuses all of the setup from SEQIN and adds the length */
 429         case NAND_CMD_PAGEPROG: {
 430                 int full_page;
 431                 dev_vdbg(ctrl->dev,
 432                          "fsl_elbc_cmdfunc: NAND_CMD_PAGEPROG "
 433                          "writing %d bytes.\n", ctrl->index);
 434
 435                 /* if the write did not start at 0 or is not a full page
 436                  * then set the exact length, otherwise use a full page
 437                  * write so the HW generates the ECC.
 438                  */
 439                 if (ctrl->oob || ctrl->column != 0 ||
 440                     ctrl->index != mtd->writesize + mtd->oobsize) {
 441                         out_be32(&lbc->fbcr, ctrl->index);
 442                         full_page = 0;
 443                 } else {
 444                         out_be32(&lbc->fbcr, 0);
 445                         full_page = 1;
 446                 }
 447
 448                 fsl_elbc_run_command(mtd);
 449
 450                 /* Read back the page in order to fill in the ECC for the
 451                  * caller.  Is this really needed?
 452                  */
 453                 if (full_page && ctrl->oob_poi) {
 454                         out_be32(&lbc->fbcr, 3);
 455                         set_addr(mtd, 6, page_addr, 1);
 456
 457                         ctrl->read_bytes = mtd->writesize + 9;
 458
 459                         fsl_elbc_do_read(chip, 1);
 460                         fsl_elbc_run_command(mtd);
 461
 462                         memcpy_fromio(ctrl->oob_poi + 6,
 463                                       &ctrl->addr[ctrl->index], 3);
 464                         ctrl->index += 3;
 465                 }
 466
 467                 ctrl->oob_poi = NULL;
 468                 return;
 469         }
 470
 471         /* CMD_STATUS must read the status byte while CEB is active */
 472         /* Note - it does not wait for the ready line */
 473         case NAND_CMD_STATUS:
 474                 out_be32(&lbc->fir,
 475                          (FIR_OP_CM0 << FIR_OP0_SHIFT) |
 476                          (FIR_OP_RBW << FIR_OP1_SHIFT));
 477                 out_be32(&lbc->fcr, NAND_CMD_STATUS << FCR_CMD0_SHIFT);
 478                 out_be32(&lbc->fbcr, 1);
 479                 set_addr(mtd, 0, 0, 0);
 480                 ctrl->read_bytes = 1;
 481
 482                 fsl_elbc_run_command(mtd);
 483
 484                 /* The chip always seems to report that it is
 485                  * write-protected, even when it is not.
 486                  */
 487                 setbits8(ctrl->addr, NAND_STATUS_WP);
 488                 return;
 489
 490         /* RESET without waiting for the ready line */
 491         case NAND_CMD_RESET:
 492                 dev_dbg(ctrl->dev, "fsl_elbc_cmdfunc: NAND_CMD_RESET.\n");
 493                 out_be32(&lbc->fir, FIR_OP_CM0 << FIR_OP0_SHIFT);
 494                 out_be32(&lbc->fcr, NAND_CMD_RESET << FCR_CMD0_SHIFT);
 495                 fsl_elbc_run_command(mtd);
 496                 return;
 497
 498         default:
 499                 dev_err(ctrl->dev,
 500                         "fsl_elbc_cmdfunc: error, unsupported command 0x%x.\n",
 501                         command);
 502         }
 503 }
 504
 505 static void fsl_elbc_select_chip(struct mtd_info *mtd, int chip)
 506 {
 507         /* The hardware does not seem to support multiple
 508          * chips per bank.
 509          */
 510 }
 511
 512 /*
 513  * Write buf to the FCM Controller Data Buffer
 514  */
 515 static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 516 {
 517         struct nand_chip *chip = mtd->priv;
 518         struct fsl_elbc_mtd *priv = chip->priv;
 519         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 520         unsigned int bufsize = mtd->writesize + mtd->oobsize;
 521
 522         if (len <= 0) {
 523                 dev_err(ctrl->dev, "write_buf of %d bytes", len);
 524                 ctrl->status = 0;
 525                 return;
 526         }
 527
 528         if ((unsigned int)len > bufsize - ctrl->index) {
 529                 dev_err(ctrl->dev,
 530                         "write_buf beyond end of buffer "
 531                         "(%d requested, %u available)\n",
 532                         len, bufsize - ctrl->index);
 533                 len = bufsize - ctrl->index;
 534         }
 535
 536         memcpy_toio(&ctrl->addr[ctrl->index], buf, len);
 537         /*
 538          * This is workaround for the weird elbc hangs during nand write,
 539          * Scott Wood says: "...perhaps difference in how long it takes a
 540          * write to make it through the localbus compared to a write to IMMR
 541          * is causing problems, and sync isn't helping for some reason."
 542          * Reading back the last byte helps though.
 543          */
 544         in_8(&ctrl->addr[ctrl->index] + len - 1);
 545
 546         ctrl->index += len;
 547 }
 548
 549 /*
 550  * read a byte from either the FCM hardware buffer if it has any data left
 551  * otherwise issue a command to read a single byte.
 552  */
 553 static u8 fsl_elbc_read_byte(struct mtd_info *mtd)
 554 {
 555         struct nand_chip *chip = mtd->priv;
 556         struct fsl_elbc_mtd *priv = chip->priv;
 557         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 558
 559         /* If there are still bytes in the FCM, then use the next byte. */
 560         if (ctrl->index < ctrl->read_bytes)
 561                 return in_8(&ctrl->addr[ctrl->index++]);
 562
 563         dev_err(ctrl->dev, "read_byte beyond end of buffer\n");
 564         return ERR_BYTE;
 565 }
 566
 567 /*
 568  * Read from the FCM Controller Data Buffer
 569  */
 570 static void fsl_elbc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 571 {
 572         struct nand_chip *chip = mtd->priv;
 573         struct fsl_elbc_mtd *priv = chip->priv;
 574         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 575         int avail;
 576
 577         if (len < 0)
 578                 return;
 579
 580         avail = min((unsigned int)len, ctrl->read_bytes - ctrl->index);
 581         memcpy_fromio(buf, &ctrl->addr[ctrl->index], avail);
 582         ctrl->index += avail;
 583
 584         if (len > avail)
 585                 dev_err(ctrl->dev,
 586                         "read_buf beyond end of buffer "
 587                         "(%d requested, %d available)\n",
 588                         len, avail);
 589 }
 590
 591 /*
 592  * Verify buffer against the FCM Controller Data Buffer
 593  */
 594 static int fsl_elbc_verify_buf(struct mtd_info *mtd, const u_char *buf, int len)
 595 {
 596         struct nand_chip *chip = mtd->priv;
 597         struct fsl_elbc_mtd *priv = chip->priv;
 598         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 599         int i;
 600
 601         if (len < 0) {
 602                 dev_err(ctrl->dev, "write_buf of %d bytes", len);
 603                 return -EINVAL;
 604         }
 605
 606         if ((unsigned int)len > ctrl->read_bytes - ctrl->index) {
 607                 dev_err(ctrl->dev,
 608                         "verify_buf beyond end of buffer "
 609                         "(%d requested, %u available)\n",
 610                         len, ctrl->read_bytes - ctrl->index);
 611
 612                 ctrl->index = ctrl->read_bytes;
 613                 return -EINVAL;
 614         }
 615
 616         for (i = 0; i < len; i++)
 617                 if (in_8(&ctrl->addr[ctrl->index + i]) != buf[i])
 618                         break;
 619
 620         ctrl->index += len;
 621         return i == len && ctrl->status == LTESR_CC ? 0 : -EIO;
 622 }
 623
 624 /* This function is called after Program and Erase Operations to
 625  * check for success or failure.
 626  */
 627 static int fsl_elbc_wait(struct mtd_info *mtd, struct nand_chip *chip)
 628 {
 629         struct fsl_elbc_mtd *priv = chip->priv;
 630         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 631         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 632
 633         if (ctrl->status != LTESR_CC)
 634                 return NAND_STATUS_FAIL;
 635
 636         /* Use READ_STATUS command, but wait for the device to be ready */
 637         ctrl->use_mdr = 0;
 638         out_be32(&lbc->fir,
 639                  (FIR_OP_CW0 << FIR_OP0_SHIFT) |
 640                  (FIR_OP_RBW << FIR_OP1_SHIFT));
 641         out_be32(&lbc->fcr, NAND_CMD_STATUS << FCR_CMD0_SHIFT);
 642         out_be32(&lbc->fbcr, 1);
 643         set_addr(mtd, 0, 0, 0);
 644         ctrl->read_bytes = 1;
 645
 646         fsl_elbc_run_command(mtd);
 647
 648         if (ctrl->status != LTESR_CC)
 649                 return NAND_STATUS_FAIL;
 650
 651         /* The chip always seems to report that it is
 652          * write-protected, even when it is not.
 653          */
 654         setbits8(ctrl->addr, NAND_STATUS_WP);
 655         return fsl_elbc_read_byte(mtd);
 656 }
 657
 658 static int fsl_elbc_chip_init_tail(struct mtd_info *mtd)
 659 {
 660         struct nand_chip *chip = mtd->priv;
 661         struct fsl_elbc_mtd *priv = chip->priv;
 662         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 663         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 664         unsigned int al;
 665
 666         /* calculate FMR Address Length field */
 667         al = 0;
 668         if (chip->pagemask & 0xffff0000)
 669                 al++;
 670         if (chip->pagemask & 0xff000000)
 671                 al++;
 672
 673         /* add to ECCM mode set in fsl_elbc_init */
 674         priv->fmr |= (12 << FMR_CWTO_SHIFT) |  /* Timeout > 12 ms */
 675                      (al << FMR_AL_SHIFT);
 676
 677         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->numchips = %d\n",
 678                 chip->numchips);
 679         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->chipsize = %ld\n",
 680                 chip->chipsize);
 681         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->pagemask = %8x\n",
 682                 chip->pagemask);
 683         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->chip_delay = %d\n",
 684                 chip->chip_delay);
 685         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->badblockpos = %d\n",
 686                 chip->badblockpos);
 687         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->chip_shift = %d\n",
 688                 chip->chip_shift);
 689         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->page_shift = %d\n",
 690                 chip->page_shift);
 691         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->phys_erase_shift = %d\n",
 692                 chip->phys_erase_shift);
 693         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->ecclayout = %p\n",
 694                 chip->ecclayout);
 695         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->ecc.mode = %d\n",
 696                 chip->ecc.mode);
 697         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->ecc.steps = %d\n",
 698                 chip->ecc.steps);
 699         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->ecc.bytes = %d\n",
 700                 chip->ecc.bytes);
 701         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->ecc.total = %d\n",
 702                 chip->ecc.total);
 703         dev_dbg(ctrl->dev, "fsl_elbc_init: nand->ecc.layout = %p\n",
 704                 chip->ecc.layout);
 705         dev_dbg(ctrl->dev, "fsl_elbc_init: mtd->flags = %08x\n", mtd->flags);
 706         dev_dbg(ctrl->dev, "fsl_elbc_init: mtd->size = %d\n", mtd->size);
 707         dev_dbg(ctrl->dev, "fsl_elbc_init: mtd->erasesize = %d\n",
 708                 mtd->erasesize);
 709         dev_dbg(ctrl->dev, "fsl_elbc_init: mtd->writesize = %d\n",
 710                 mtd->writesize);
 711         dev_dbg(ctrl->dev, "fsl_elbc_init: mtd->oobsize = %d\n",
 712                 mtd->oobsize);
 713
 714         /* adjust Option Register and ECC to match Flash page size */
 715         if (mtd->writesize == 512) {
 716                 priv->page_size = 0;
 717                 clrbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
 718         } else if (mtd->writesize == 2048) {
 719                 priv->page_size = 1;
 720                 setbits32(&lbc->bank[priv->bank].or, OR_FCM_PGS);
 721                 /* adjust ecc setup if needed */
 722                 if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
 723                     BR_DECC_CHK_GEN) {
 724                         chip->ecc.size = 512;
 725                         chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
 726                                            &fsl_elbc_oob_lp_eccm1 :
 727                                            &fsl_elbc_oob_lp_eccm0;
 728                         chip->badblock_pattern = &largepage_memorybased;
 729                 }
 730         } else {
 731                 dev_err(ctrl->dev,
 732                         "fsl_elbc_init: page size %d is not supported\n",
 733                         mtd->writesize);
 734                 return -1;
 735         }
 736
 737         return 0;
 738 }
 739
 740 static int fsl_elbc_read_page(struct mtd_info *mtd,
 741                               struct nand_chip *chip,
 742                               uint8_t *buf)
 743 {
 744         fsl_elbc_read_buf(mtd, buf, mtd->writesize);
 745         fsl_elbc_read_buf(mtd, chip->oob_poi, mtd->oobsize);
 746
 747         if (fsl_elbc_wait(mtd, chip) & NAND_STATUS_FAIL)
 748                 mtd->ecc_stats.failed++;
 749
 750         return 0;
 751 }
 752
 753 /* ECC will be calculated automatically, and errors will be detected in
 754  * waitfunc.
 755  */
 756 static void fsl_elbc_write_page(struct mtd_info *mtd,
 757                                 struct nand_chip *chip,
 758                                 const uint8_t *buf)
 759 {
 760         struct fsl_elbc_mtd *priv = chip->priv;
 761         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 762
 763         fsl_elbc_write_buf(mtd, buf, mtd->writesize);
 764         fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
 765
 766         ctrl->oob_poi = chip->oob_poi;
 767 }
 768
 769 static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
 770 {
 771         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 772         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 773         struct nand_chip *chip = &priv->chip;
 774
 775         dev_dbg(priv->dev, "eLBC Set Information for bank %d\n", priv->bank);
 776
 777         /* Fill in fsl_elbc_mtd structure */
 778         priv->mtd.priv = chip;
 779         priv->mtd.owner = THIS_MODULE;
 780         priv->fmr = 0; /* rest filled in later */
 781
 782         /* fill in nand_chip structure */
 783         /* set up function call table */
 784         chip->read_byte = fsl_elbc_read_byte;
 785         chip->write_buf = fsl_elbc_write_buf;
 786         chip->read_buf = fsl_elbc_read_buf;
 787         chip->verify_buf = fsl_elbc_verify_buf;
 788         chip->select_chip = fsl_elbc_select_chip;
 789         chip->cmdfunc = fsl_elbc_cmdfunc;
 790         chip->waitfunc = fsl_elbc_wait;
 791
 792         chip->bbt_td = &bbt_main_descr;
 793         chip->bbt_md = &bbt_mirror_descr;
 794
 795         /* set up nand options */
 796         chip->options = NAND_NO_READRDY | NAND_NO_AUTOINCR |
 797                         NAND_USE_FLASH_BBT;
 798
 799         chip->controller = &ctrl->controller;
 800         chip->priv = priv;
 801
 802         chip->ecc.read_page = fsl_elbc_read_page;
 803         chip->ecc.write_page = fsl_elbc_write_page;
 804
 805         /* If CS Base Register selects full hardware ECC then use it */
 806         if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
 807             BR_DECC_CHK_GEN) {
 808                 chip->ecc.mode = NAND_ECC_HW;
 809                 /* put in small page settings and adjust later if needed */
 810                 chip->ecc.layout = (priv->fmr & FMR_ECCM) ?
 811                                 &fsl_elbc_oob_sp_eccm1 : &fsl_elbc_oob_sp_eccm0;
 812                 chip->ecc.size = 512;
 813                 chip->ecc.bytes = 3;
 814         } else {
 815                 /* otherwise fall back to default software ECC */
 816                 chip->ecc.mode = NAND_ECC_SOFT;
 817         }
 818
 819         return 0;
 820 }
 821
 822 static int fsl_elbc_chip_remove(struct fsl_elbc_mtd *priv)
 823 {
 824         struct fsl_elbc_ctrl *ctrl = priv->ctrl;
 825
 826         nand_release(&priv->mtd);
 827
 828         kfree(priv->mtd.name);
 829
 830         if (priv->vbase)
 831                 iounmap(priv->vbase);
 832
 833         ctrl->chips[priv->bank] = NULL;
 834         kfree(priv);
 835
 836         return 0;
 837 }
 838
 839 static int __devinit fsl_elbc_chip_probe(struct fsl_elbc_ctrl *ctrl,
 840                                          struct device_node *node)
 841 {
 842         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 843         struct fsl_elbc_mtd *priv;
 844         struct resource res;
 845 #ifdef CONFIG_MTD_PARTITIONS
 846         static const char *part_probe_types[]
 847                 = { "cmdlinepart", "RedBoot", NULL };
 848         struct mtd_partition *parts;
 849 #endif
 850         int ret;
 851         int bank;
 852
 853         /* get, allocate and map the memory resource */
 854         ret = of_address_to_resource(node, 0, &res);
 855         if (ret) {
 856                 dev_err(ctrl->dev, "failed to get resource\n");
 857                 return ret;
 858         }
 859
 860         /* find which chip select it is connected to */
 861         for (bank = 0; bank < MAX_BANKS; bank++)
 862                 if ((in_be32(&lbc->bank[bank].br) & BR_V) &&
 863                     (in_be32(&lbc->bank[bank].br) & BR_MSEL) == BR_MS_FCM &&
 864                     (in_be32(&lbc->bank[bank].br) &
 865                      in_be32(&lbc->bank[bank].or) & BR_BA)
 866                      == res.start)
 867                         break;
 868
 869         if (bank >= MAX_BANKS) {
 870                 dev_err(ctrl->dev, "address did not match any chip selects\n");
 871                 return -ENODEV;
 872         }
 873
 874         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 875         if (!priv)
 876                 return -ENOMEM;
 877
 878         ctrl->chips[bank] = priv;
 879         priv->bank = bank;
 880         priv->ctrl = ctrl;
 881         priv->dev = ctrl->dev;
 882
 883         priv->vbase = ioremap(res.start, res.end - res.start + 1);
 884         if (!priv->vbase) {
 885                 dev_err(ctrl->dev, "failed to map chip region\n");
 886                 ret = -ENOMEM;
 887                 goto err;
 888         }
 889
 890         priv->mtd.name = kasprintf(GFP_KERNEL, "%x.flash", (unsigned)res.start);
 891         if (!priv->mtd.name) {
 892                 ret = -ENOMEM;
 893                 goto err;
 894         }
 895
 896         ret = fsl_elbc_chip_init(priv);
 897         if (ret)
 898                 goto err;
 899
 900         ret = nand_scan_ident(&priv->mtd, 1);
 901         if (ret)
 902                 goto err;
 903
 904         ret = fsl_elbc_chip_init_tail(&priv->mtd);
 905         if (ret)
 906                 goto err;
 907
 908         ret = nand_scan_tail(&priv->mtd);
 909         if (ret)
 910                 goto err;
 911
 912 #ifdef CONFIG_MTD_PARTITIONS
 913         /* First look for RedBoot table or partitions on the command
 914          * line, these take precedence over device tree information */
 915         ret = parse_mtd_partitions(&priv->mtd, part_probe_types, &parts, 0);
 916         if (ret < 0)
 917                 goto err;
 918
 919 #ifdef CONFIG_MTD_OF_PARTS
 920         if (ret == 0) {
 921                 ret = of_mtd_parse_partitions(priv->dev, node, &parts);
 922                 if (ret < 0)
 923                         goto err;
 924         }
 925 #endif
 926
 927         if (ret > 0)
 928                 add_mtd_partitions(&priv->mtd, parts, ret);
 929         else
 930 #endif
 931                 add_mtd_device(&priv->mtd);
 932
 933         printk(KERN_INFO "eLBC NAND device at 0x%zx, bank %d\n",
 934                res.start, priv->bank);
 935         return 0;
 936
 937 err:
 938         fsl_elbc_chip_remove(priv);
 939         return ret;
 940 }
 941
 942 static int __devinit fsl_elbc_ctrl_init(struct fsl_elbc_ctrl *ctrl)
 943 {
 944         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 945
 946         /* clear event registers */
 947         setbits32(&lbc->ltesr, LTESR_NAND_MASK);
 948         out_be32(&lbc->lteatr, 0);
 949
 950         /* Enable interrupts for any detected events */
 951         out_be32(&lbc->lteir, LTESR_NAND_MASK);
 952
 953         ctrl->read_bytes = 0;
 954         ctrl->index = 0;
 955         ctrl->addr = NULL;
 956
 957         return 0;
 958 }
 959
 960 static int fsl_elbc_ctrl_remove(struct of_device *ofdev)
 961 {
 962         struct fsl_elbc_ctrl *ctrl = dev_get_drvdata(&ofdev->dev);
 963         int i;
 964
 965         for (i = 0; i < MAX_BANKS; i++)
 966                 if (ctrl->chips[i])
 967                         fsl_elbc_chip_remove(ctrl->chips[i]);
 968
 969         if (ctrl->irq)
 970                 free_irq(ctrl->irq, ctrl);
 971
 972         if (ctrl->regs)
 973                 iounmap(ctrl->regs);
 974
 975         dev_set_drvdata(&ofdev->dev, NULL);
 976         kfree(ctrl);
 977         return 0;
 978 }
 979
 980 /* NOTE: This interrupt is also used to report other localbus events,
 981  * such as transaction errors on other chipselects.  If we want to
 982  * capture those, we'll need to move the IRQ code into a shared
 983  * LBC driver.
 984  */
 985
 986 static irqreturn_t fsl_elbc_ctrl_irq(int irqno, void *data)
 987 {
 988         struct fsl_elbc_ctrl *ctrl = data;
 989         struct fsl_lbc_regs __iomem *lbc = ctrl->regs;
 990         __be32 status = in_be32(&lbc->ltesr) & LTESR_NAND_MASK;
 991
 992         if (status) {
 993                 out_be32(&lbc->ltesr, status);
 994                 out_be32(&lbc->lteatr, 0);
 995
 996                 ctrl->irq_status = status;
 997                 smp_wmb();
 998                 wake_up(&ctrl->irq_wait);
 999
1000                 return IRQ_HANDLED;
1001         }
1002
1003         return IRQ_NONE;
1004 }
1005
1006 /* fsl_elbc_ctrl_probe
1007  *
1008  * called by device layer when it finds a device matching
1009  * one our driver can handled. This code allocates all of
1010  * the resources needed for the controller only.  The
1011  * resources for the NAND banks themselves are allocated
1012  * in the chip probe function.
1013 */
1014
1015 static int __devinit fsl_elbc_ctrl_probe(struct of_device *ofdev,
1016                                          const struct of_device_id *match)
1017 {
1018         struct device_node *child;
1019         struct fsl_elbc_ctrl *ctrl;
1020         int ret;
1021
1022         ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
1023         if (!ctrl)
1024                 return -ENOMEM;
1025
1026         dev_set_drvdata(&ofdev->dev, ctrl);
1027
1028         spin_lock_init(&ctrl->controller.lock);
1029         init_waitqueue_head(&ctrl->controller.wq);
1030         init_waitqueue_head(&ctrl->irq_wait);
1031
1032         ctrl->regs = of_iomap(ofdev->node, 0);
1033         if (!ctrl->regs) {
1034                 dev_err(&ofdev->dev, "failed to get memory region\n");
1035                 ret = -ENODEV;
1036                 goto err;
1037         }
1038
1039         ctrl->irq = of_irq_to_resource(ofdev->node, 0, NULL);
1040         if (ctrl->irq == NO_IRQ) {
1041                 dev_err(&ofdev->dev, "failed to get irq resource\n");
1042                 ret = -ENODEV;
1043                 goto err;
1044         }
1045
1046         ctrl->dev = &ofdev->dev;
1047
1048         ret = fsl_elbc_ctrl_init(ctrl);
1049         if (ret < 0)
1050                 goto err;
1051
1052         ret = request_irq(ctrl->irq, fsl_elbc_ctrl_irq, 0, "fsl-elbc", ctrl);
1053         if (ret != 0) {
1054                 dev_err(&ofdev->dev, "failed to install irq (%d)\n",
1055                         ctrl->irq);
1056                 ret = ctrl->irq;
1057                 goto err;
1058         }
1059
1060         for_each_child_of_node(ofdev->node, child)
1061                 if (of_device_is_compatible(child, "fsl,elbc-fcm-nand"))
1062                         fsl_elbc_chip_probe(ctrl, child);
1063
1064         return 0;
1065
1066 err:
1067         fsl_elbc_ctrl_remove(ofdev);
1068         return ret;
1069 }
1070
1071 static const struct of_device_id fsl_elbc_match[] = {
1072         {
1073                 .compatible = "fsl,elbc",
1074         },
1075         {}
1076 };
1077
1078 static struct of_platform_driver fsl_elbc_ctrl_driver = {
1079         .driver = {
1080                 .name   = "fsl-elbc",
1081         },
1082         .match_table = fsl_elbc_match,
1083         .probe = fsl_elbc_ctrl_probe,
1084         .remove = fsl_elbc_ctrl_remove,
1085 };
1086
1087 static int __init fsl_elbc_init(void)
1088 {
1089         return of_register_platform_driver(&fsl_elbc_ctrl_driver);
1090 }
1091
1092 static void __exit fsl_elbc_exit(void)
1093 {
1094         of_unregister_platform_driver(&fsl_elbc_ctrl_driver);
1095 }
1096
1097 module_init(fsl_elbc_init);
1098 module_exit(fsl_elbc_exit);
1099
1100 MODULE_LICENSE("GPL");
1101 MODULE_AUTHOR("Freescale");
1102 MODULE_DESCRIPTION("Freescale Enhanced Local Bus Controller MTD NAND driver");