drivers/mtd/nand/fsl_ifc_nand.c

   1 /* Integrated Flash Controller NAND Machine Driver
   2  *
   3  * Copyright (c) 2012 Freescale Semiconductor, Inc
   4  *
   5  * Authors: Dipen Dudhat <Dipen.Dudhat@freescale.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <malloc.h>
  12 #include <nand.h>
  13
  14 #include <linux/mtd/mtd.h>
  15 #include <linux/mtd/nand.h>
  16 #include <linux/mtd/nand_ecc.h>
  17
  18 #include <asm/io.h>
  19 #include <asm/errno.h>
  20 #include <asm/fsl_ifc.h>
  21
  22 #define FSL_IFC_V1_1_0  0x01010000
  23 #define MAX_BANKS       4
  24 #define ERR_BYTE        0xFF /* Value returned for read bytes
  25                                 when read failed */
  26 #define IFC_TIMEOUT_MSECS 10 /* Maximum number of mSecs to wait for IFC
  27                                 NAND Machine */
  28
  29 struct fsl_ifc_ctrl;
  30
  31 /* mtd information per set */
  32 struct fsl_ifc_mtd {
  33         struct nand_chip chip;
  34         struct fsl_ifc_ctrl *ctrl;
  35
  36         struct device *dev;
  37         int bank;               /* Chip select bank number                */
  38         unsigned int bufnum_mask; /* bufnum = page & bufnum_mask */
  39         u8 __iomem *vbase;      /* Chip select base virtual address       */
  40 };
  41
  42 /* overview of the fsl ifc controller */
  43 struct fsl_ifc_ctrl {
  44         struct nand_hw_control controller;
  45         struct fsl_ifc_mtd *chips[MAX_BANKS];
  46
  47         /* device info */
  48         struct fsl_ifc *regs;
  49         uint8_t __iomem *addr;   /* Address of assigned IFC buffer        */
  50         unsigned int cs_nand;    /* On which chipsel NAND is connected    */
  51         unsigned int page;       /* Last page written to / read from      */
  52         unsigned int read_bytes; /* Number of bytes read during command   */
  53         unsigned int column;     /* Saved column from SEQIN               */
  54         unsigned int index;      /* Pointer to next byte to 'read'        */
  55         unsigned int status;     /* status read from NEESR after last op  */
  56         unsigned int oob;        /* Non zero if operating on OOB data     */
  57         unsigned int eccread;    /* Non zero for a full-page ECC read     */
  58 };
  59
  60 static struct fsl_ifc_ctrl *ifc_ctrl;
  61
  62 /* 512-byte page with 4-bit ECC, 8-bit */
  63 static struct nand_ecclayout oob_512_8bit_ecc4 = {
  64         .eccbytes = 8,
  65         .eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
  66         .oobfree = { {0, 5}, {6, 2} },
  67 };
  68
  69 /* 512-byte page with 4-bit ECC, 16-bit */
  70 static struct nand_ecclayout oob_512_16bit_ecc4 = {
  71         .eccbytes = 8,
  72         .eccpos = {8, 9, 10, 11, 12, 13, 14, 15},
  73         .oobfree = { {2, 6}, },
  74 };
  75
  76 /* 2048-byte page size with 4-bit ECC */
  77 static struct nand_ecclayout oob_2048_ecc4 = {
  78         .eccbytes = 32,
  79         .eccpos = {
  80                 8, 9, 10, 11, 12, 13, 14, 15,
  81                 16, 17, 18, 19, 20, 21, 22, 23,
  82                 24, 25, 26, 27, 28, 29, 30, 31,
  83                 32, 33, 34, 35, 36, 37, 38, 39,
  84         },
  85         .oobfree = { {2, 6}, {40, 24} },
  86 };
  87
  88 /* 4096-byte page size with 4-bit ECC */
  89 static struct nand_ecclayout oob_4096_ecc4 = {
  90         .eccbytes = 64,
  91         .eccpos = {
  92                 8, 9, 10, 11, 12, 13, 14, 15,
  93                 16, 17, 18, 19, 20, 21, 22, 23,
  94                 24, 25, 26, 27, 28, 29, 30, 31,
  95                 32, 33, 34, 35, 36, 37, 38, 39,
  96                 40, 41, 42, 43, 44, 45, 46, 47,
  97                 48, 49, 50, 51, 52, 53, 54, 55,
  98                 56, 57, 58, 59, 60, 61, 62, 63,
  99                 64, 65, 66, 67, 68, 69, 70, 71,
 100         },
 101         .oobfree = { {2, 6}, {72, 56} },
 102 };
 103
 104 /* 4096-byte page size with 8-bit ECC -- requires 218-byte OOB */
 105 static struct nand_ecclayout oob_4096_ecc8 = {
 106         .eccbytes = 128,
 107         .eccpos = {
 108                 8, 9, 10, 11, 12, 13, 14, 15,
 109                 16, 17, 18, 19, 20, 21, 22, 23,
 110                 24, 25, 26, 27, 28, 29, 30, 31,
 111                 32, 33, 34, 35, 36, 37, 38, 39,
 112                 40, 41, 42, 43, 44, 45, 46, 47,
 113                 48, 49, 50, 51, 52, 53, 54, 55,
 114                 56, 57, 58, 59, 60, 61, 62, 63,
 115                 64, 65, 66, 67, 68, 69, 70, 71,
 116                 72, 73, 74, 75, 76, 77, 78, 79,
 117                 80, 81, 82, 83, 84, 85, 86, 87,
 118                 88, 89, 90, 91, 92, 93, 94, 95,
 119                 96, 97, 98, 99, 100, 101, 102, 103,
 120                 104, 105, 106, 107, 108, 109, 110, 111,
 121                 112, 113, 114, 115, 116, 117, 118, 119,
 122                 120, 121, 122, 123, 124, 125, 126, 127,
 123                 128, 129, 130, 131, 132, 133, 134, 135,
 124         },
 125         .oobfree = { {2, 6}, {136, 82} },
 126 };
 127
 128
 129 /*
 130  * Generic flash bbt descriptors
 131  */
 132 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
 133 static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };
 134
 135 static struct nand_bbt_descr bbt_main_descr = {
 136         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 137                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 138         .offs = 2, /* 0 on 8-bit small page */
 139         .len = 4,
 140         .veroffs = 6,
 141         .maxblocks = 4,
 142         .pattern = bbt_pattern,
 143 };
 144
 145 static struct nand_bbt_descr bbt_mirror_descr = {
 146         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 147                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 148         .offs = 2, /* 0 on 8-bit small page */
 149         .len = 4,
 150         .veroffs = 6,
 151         .maxblocks = 4,
 152         .pattern = mirror_pattern,
 153 };
 154
 155 /*
 156  * Set up the IFC hardware block and page address fields, and the ifc nand
 157  * structure addr field to point to the correct IFC buffer in memory
 158  */
 159 static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
 160 {
 161         struct nand_chip *chip = mtd->priv;
 162         struct fsl_ifc_mtd *priv = chip->priv;
 163         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 164         struct fsl_ifc *ifc = ctrl->regs;
 165         int buf_num;
 166
 167         ctrl->page = page_addr;
 168
 169         /* Program ROW0/COL0 */
 170         out_be32(&ifc->ifc_nand.row0, page_addr);
 171         out_be32(&ifc->ifc_nand.col0, (oob ? IFC_NAND_COL_MS : 0) | column);
 172
 173         buf_num = page_addr & priv->bufnum_mask;
 174
 175         ctrl->addr = priv->vbase + buf_num * (mtd->writesize * 2);
 176         ctrl->index = column;
 177
 178         /* for OOB data point to the second half of the buffer */
 179         if (oob)
 180                 ctrl->index += mtd->writesize;
 181 }
 182
 183 static int is_blank(struct mtd_info *mtd, struct fsl_ifc_ctrl *ctrl,
 184                     unsigned int bufnum)
 185 {
 186         struct nand_chip *chip = mtd->priv;
 187         struct fsl_ifc_mtd *priv = chip->priv;
 188         u8 __iomem *addr = priv->vbase + bufnum * (mtd->writesize * 2);
 189         u32 __iomem *main = (u32 *)addr;
 190         u8 __iomem *oob = addr + mtd->writesize;
 191         int i;
 192
 193         for (i = 0; i < mtd->writesize / 4; i++) {
 194                 if (__raw_readl(&main[i]) != 0xffffffff)
 195                         return 0;
 196         }
 197
 198         for (i = 0; i < chip->ecc.layout->eccbytes; i++) {
 199                 int pos = chip->ecc.layout->eccpos[i];
 200
 201                 if (__raw_readb(&oob[pos]) != 0xff)
 202                         return 0;
 203         }
 204
 205         return 1;
 206 }
 207
 208 /* returns nonzero if entire page is blank */
 209 static int check_read_ecc(struct mtd_info *mtd, struct fsl_ifc_ctrl *ctrl,
 210                           u32 *eccstat, unsigned int bufnum)
 211 {
 212         u32 reg = eccstat[bufnum / 4];
 213         int errors;
 214
 215         errors = (reg >> ((3 - bufnum % 4) * 8)) & 15;
 216
 217         return errors;
 218 }
 219
 220 /*
 221  * execute IFC NAND command and wait for it to complete
 222  */
 223 static int fsl_ifc_run_command(struct mtd_info *mtd)
 224 {
 225         struct nand_chip *chip = mtd->priv;
 226         struct fsl_ifc_mtd *priv = chip->priv;
 227         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 228         struct fsl_ifc *ifc = ctrl->regs;
 229         long long end_tick;
 230         u32 eccstat[4];
 231         int i;
 232
 233         /* set the chip select for NAND Transaction */
 234         out_be32(&ifc->ifc_nand.nand_csel, ifc_ctrl->cs_nand);
 235
 236         /* start read/write seq */
 237         out_be32(&ifc->ifc_nand.nandseq_strt,
 238                  IFC_NAND_SEQ_STRT_FIR_STRT);
 239
 240         /* wait for NAND Machine complete flag or timeout */
 241         end_tick = usec2ticks(IFC_TIMEOUT_MSECS * 1000) + get_ticks();
 242
 243         while (end_tick > get_ticks()) {
 244                 ctrl->status = in_be32(&ifc->ifc_nand.nand_evter_stat);
 245
 246                 if (ctrl->status & IFC_NAND_EVTER_STAT_OPC)
 247                         break;
 248         }
 249
 250         out_be32(&ifc->ifc_nand.nand_evter_stat, ctrl->status);
 251
 252         if (ctrl->status & IFC_NAND_EVTER_STAT_FTOER)
 253                 printf("%s: Flash Time Out Error\n", __func__);
 254         if (ctrl->status & IFC_NAND_EVTER_STAT_WPER)
 255                 printf("%s: Write Protect Error\n", __func__);
 256
 257         if (ctrl->eccread) {
 258                 int errors;
 259                 int bufnum = ctrl->page & priv->bufnum_mask;
 260                 int sector = bufnum * chip->ecc.steps;
 261                 int sector_end = sector + chip->ecc.steps - 1;
 262
 263                 for (i = sector / 4; i <= sector_end / 4; i++)
 264                         eccstat[i] = in_be32(&ifc->ifc_nand.nand_eccstat[i]);
 265
 266                 for (i = sector; i <= sector_end; i++) {
 267                         errors = check_read_ecc(mtd, ctrl, eccstat, i);
 268
 269                         if (errors == 15) {
 270                                 /*
 271                                  * Uncorrectable error.
 272                                  * OK only if the whole page is blank.
 273                                  *
 274                                  * We disable ECCER reporting due to erratum
 275                                  * IFC-A002770 -- so report it now if we
 276                                  * see an uncorrectable error in ECCSTAT.
 277                                  */
 278                                 if (!is_blank(mtd, ctrl, bufnum))
 279                                         ctrl->status |=
 280                                                 IFC_NAND_EVTER_STAT_ECCER;
 281                                 break;
 282                         }
 283
 284                         mtd->ecc_stats.corrected += errors;
 285                 }
 286
 287                 ctrl->eccread = 0;
 288         }
 289
 290         /* returns 0 on success otherwise non-zero) */
 291         return ctrl->status == IFC_NAND_EVTER_STAT_OPC ? 0 : -EIO;
 292 }
 293
 294 static void fsl_ifc_do_read(struct nand_chip *chip,
 295                             int oob,
 296                             struct mtd_info *mtd)
 297 {
 298         struct fsl_ifc_mtd *priv = chip->priv;
 299         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 300         struct fsl_ifc *ifc = ctrl->regs;
 301
 302         /* Program FIR/IFC_NAND_FCR0 for Small/Large page */
 303         if (mtd->writesize > 512) {
 304                 out_be32(&ifc->ifc_nand.nand_fir0,
 305                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 306                          (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 307                          (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
 308                          (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP3_SHIFT) |
 309                          (IFC_FIR_OP_RBCD << IFC_NAND_FIR0_OP4_SHIFT));
 310                 out_be32(&ifc->ifc_nand.nand_fir1, 0x0);
 311
 312                 out_be32(&ifc->ifc_nand.nand_fcr0,
 313                         (NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT) |
 314                         (NAND_CMD_READSTART << IFC_NAND_FCR0_CMD1_SHIFT));
 315         } else {
 316                 out_be32(&ifc->ifc_nand.nand_fir0,
 317                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 318                          (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 319                          (IFC_FIR_OP_RA0  << IFC_NAND_FIR0_OP2_SHIFT) |
 320                          (IFC_FIR_OP_RBCD << IFC_NAND_FIR0_OP3_SHIFT));
 321
 322                 if (oob)
 323                         out_be32(&ifc->ifc_nand.nand_fcr0,
 324                                  NAND_CMD_READOOB << IFC_NAND_FCR0_CMD0_SHIFT);
 325                 else
 326                         out_be32(&ifc->ifc_nand.nand_fcr0,
 327                                 NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT);
 328         }
 329 }
 330
 331 /* cmdfunc send commands to the IFC NAND Machine */
 332 static void fsl_ifc_cmdfunc(struct mtd_info *mtd, unsigned int command,
 333                              int column, int page_addr)
 334 {
 335         struct nand_chip *chip = mtd->priv;
 336         struct fsl_ifc_mtd *priv = chip->priv;
 337         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 338         struct fsl_ifc *ifc = ctrl->regs;
 339
 340         /* clear the read buffer */
 341         ctrl->read_bytes = 0;
 342         if (command != NAND_CMD_PAGEPROG)
 343                 ctrl->index = 0;
 344
 345         switch (command) {
 346         /* READ0 read the entire buffer to use hardware ECC. */
 347         case NAND_CMD_READ0: {
 348                 out_be32(&ifc->ifc_nand.nand_fbcr, 0);
 349                 set_addr(mtd, 0, page_addr, 0);
 350
 351                 ctrl->read_bytes = mtd->writesize + mtd->oobsize;
 352                 ctrl->index += column;
 353
 354                 if (chip->ecc.mode == NAND_ECC_HW)
 355                         ctrl->eccread = 1;
 356
 357                 fsl_ifc_do_read(chip, 0, mtd);
 358                 fsl_ifc_run_command(mtd);
 359                 return;
 360         }
 361
 362         /* READOOB reads only the OOB because no ECC is performed. */
 363         case NAND_CMD_READOOB:
 364                 out_be32(&ifc->ifc_nand.nand_fbcr, mtd->oobsize - column);
 365                 set_addr(mtd, column, page_addr, 1);
 366
 367                 ctrl->read_bytes = mtd->writesize + mtd->oobsize;
 368
 369                 fsl_ifc_do_read(chip, 1, mtd);
 370                 fsl_ifc_run_command(mtd);
 371
 372                 return;
 373
 374         /* READID must read all possible bytes while CEB is active */
 375         case NAND_CMD_READID:
 376         case NAND_CMD_PARAM: {
 377                 int timing = IFC_FIR_OP_RB;
 378                 if (command == NAND_CMD_PARAM)
 379                         timing = IFC_FIR_OP_RBCD;
 380
 381                 out_be32(&ifc->ifc_nand.nand_fir0,
 382                                 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 383                                 (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
 384                                 (timing << IFC_NAND_FIR0_OP2_SHIFT));
 385                 out_be32(&ifc->ifc_nand.nand_fcr0,
 386                                 command << IFC_NAND_FCR0_CMD0_SHIFT);
 387                 out_be32(&ifc->ifc_nand.row3, column);
 388
 389                 /*
 390                  * although currently it's 8 bytes for READID, we always read
 391                  * the maximum 256 bytes(for PARAM)
 392                  */
 393                 out_be32(&ifc->ifc_nand.nand_fbcr, 256);
 394                 ctrl->read_bytes = 256;
 395
 396                 set_addr(mtd, 0, 0, 0);
 397                 fsl_ifc_run_command(mtd);
 398                 return;
 399         }
 400
 401         /* ERASE1 stores the block and page address */
 402         case NAND_CMD_ERASE1:
 403                 set_addr(mtd, 0, page_addr, 0);
 404                 return;
 405
 406         /* ERASE2 uses the block and page address from ERASE1 */
 407         case NAND_CMD_ERASE2:
 408                 out_be32(&ifc->ifc_nand.nand_fir0,
 409                          (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 410                          (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 411                          (IFC_FIR_OP_CMD1 << IFC_NAND_FIR0_OP2_SHIFT));
 412
 413                 out_be32(&ifc->ifc_nand.nand_fcr0,
 414                          (NAND_CMD_ERASE1 << IFC_NAND_FCR0_CMD0_SHIFT) |
 415                          (NAND_CMD_ERASE2 << IFC_NAND_FCR0_CMD1_SHIFT));
 416
 417                 out_be32(&ifc->ifc_nand.nand_fbcr, 0);
 418                 ctrl->read_bytes = 0;
 419                 fsl_ifc_run_command(mtd);
 420                 return;
 421
 422         /* SEQIN sets up the addr buffer and all registers except the length */
 423         case NAND_CMD_SEQIN: {
 424                 u32 nand_fcr0;
 425                 ctrl->column = column;
 426                 ctrl->oob = 0;
 427
 428                 if (mtd->writesize > 512) {
 429                         nand_fcr0 =
 430                                 (NAND_CMD_SEQIN << IFC_NAND_FCR0_CMD0_SHIFT) |
 431                                 (NAND_CMD_PAGEPROG << IFC_NAND_FCR0_CMD1_SHIFT);
 432
 433                         out_be32(&ifc->ifc_nand.nand_fir0,
 434                                  (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 435                                  (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP1_SHIFT) |
 436                                  (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP2_SHIFT) |
 437                                  (IFC_FIR_OP_WBCD  << IFC_NAND_FIR0_OP3_SHIFT) |
 438                                  (IFC_FIR_OP_CW1 << IFC_NAND_FIR0_OP4_SHIFT));
 439                         out_be32(&ifc->ifc_nand.nand_fir1, 0);
 440                 } else {
 441                         nand_fcr0 = ((NAND_CMD_PAGEPROG <<
 442                                         IFC_NAND_FCR0_CMD1_SHIFT) |
 443                                     (NAND_CMD_SEQIN <<
 444                                         IFC_NAND_FCR0_CMD2_SHIFT));
 445
 446                         out_be32(&ifc->ifc_nand.nand_fir0,
 447                                  (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 448                                  (IFC_FIR_OP_CMD2 << IFC_NAND_FIR0_OP1_SHIFT) |
 449                                  (IFC_FIR_OP_CA0 << IFC_NAND_FIR0_OP2_SHIFT) |
 450                                  (IFC_FIR_OP_RA0 << IFC_NAND_FIR0_OP3_SHIFT) |
 451                                  (IFC_FIR_OP_WBCD << IFC_NAND_FIR0_OP4_SHIFT));
 452                         out_be32(&ifc->ifc_nand.nand_fir1,
 453                                  (IFC_FIR_OP_CW1 << IFC_NAND_FIR1_OP5_SHIFT));
 454
 455                         if (column >= mtd->writesize)
 456                                 nand_fcr0 |=
 457                                 NAND_CMD_READOOB << IFC_NAND_FCR0_CMD0_SHIFT;
 458                         else
 459                                 nand_fcr0 |=
 460                                 NAND_CMD_READ0 << IFC_NAND_FCR0_CMD0_SHIFT;
 461                 }
 462
 463                 if (column >= mtd->writesize) {
 464                         /* OOB area --> READOOB */
 465                         column -= mtd->writesize;
 466                         ctrl->oob = 1;
 467                 }
 468                 out_be32(&ifc->ifc_nand.nand_fcr0, nand_fcr0);
 469                 set_addr(mtd, column, page_addr, ctrl->oob);
 470                 return;
 471         }
 472
 473         /* PAGEPROG reuses all of the setup from SEQIN and adds the length */
 474         case NAND_CMD_PAGEPROG:
 475                 if (ctrl->oob)
 476                         out_be32(&ifc->ifc_nand.nand_fbcr,
 477                                         ctrl->index - ctrl->column);
 478                 else
 479                         out_be32(&ifc->ifc_nand.nand_fbcr, 0);
 480
 481                 fsl_ifc_run_command(mtd);
 482                 return;
 483
 484         case NAND_CMD_STATUS:
 485                 out_be32(&ifc->ifc_nand.nand_fir0,
 486                                 (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 487                                 (IFC_FIR_OP_RB << IFC_NAND_FIR0_OP1_SHIFT));
 488                 out_be32(&ifc->ifc_nand.nand_fcr0,
 489                                 NAND_CMD_STATUS << IFC_NAND_FCR0_CMD0_SHIFT);
 490                 out_be32(&ifc->ifc_nand.nand_fbcr, 1);
 491                 set_addr(mtd, 0, 0, 0);
 492                 ctrl->read_bytes = 1;
 493
 494                 fsl_ifc_run_command(mtd);
 495
 496                 /* Chip sometimes reporting write protect even when it's not */
 497                 out_8(ctrl->addr, in_8(ctrl->addr) | NAND_STATUS_WP);
 498                 return;
 499
 500         case NAND_CMD_RESET:
 501                 out_be32(&ifc->ifc_nand.nand_fir0,
 502                                 IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT);
 503                 out_be32(&ifc->ifc_nand.nand_fcr0,
 504                                 NAND_CMD_RESET << IFC_NAND_FCR0_CMD0_SHIFT);
 505                 fsl_ifc_run_command(mtd);
 506                 return;
 507
 508         default:
 509                 printf("%s: error, unsupported command 0x%x.\n",
 510                         __func__, command);
 511         }
 512 }
 513
 514 /*
 515  * Write buf to the IFC NAND Controller Data Buffer
 516  */
 517 static void fsl_ifc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 518 {
 519         struct nand_chip *chip = mtd->priv;
 520         struct fsl_ifc_mtd *priv = chip->priv;
 521         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 522         unsigned int bufsize = mtd->writesize + mtd->oobsize;
 523
 524         if (len <= 0) {
 525                 printf("%s of %d bytes", __func__, len);
 526                 ctrl->status = 0;
 527                 return;
 528         }
 529
 530         if ((unsigned int)len > bufsize - ctrl->index) {
 531                 printf("%s beyond end of buffer "
 532                        "(%d requested, %u available)\n",
 533                         __func__, len, bufsize - ctrl->index);
 534                 len = bufsize - ctrl->index;
 535         }
 536
 537         memcpy_toio(&ctrl->addr[ctrl->index], buf, len);
 538         ctrl->index += len;
 539 }
 540
 541 /*
 542  * read a byte from either the IFC hardware buffer if it has any data left
 543  * otherwise issue a command to read a single byte.
 544  */
 545 static u8 fsl_ifc_read_byte(struct mtd_info *mtd)
 546 {
 547         struct nand_chip *chip = mtd->priv;
 548         struct fsl_ifc_mtd *priv = chip->priv;
 549         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 550
 551         /* If there are still bytes in the IFC buffer, then use the
 552          * next byte. */
 553         if (ctrl->index < ctrl->read_bytes)
 554                 return in_8(&ctrl->addr[ctrl->index++]);
 555
 556         printf("%s beyond end of buffer\n", __func__);
 557         return ERR_BYTE;
 558 }
 559
 560 /*
 561  * Read two bytes from the IFC hardware buffer
 562  * read function for 16-bit buswith
 563  */
 564 static uint8_t fsl_ifc_read_byte16(struct mtd_info *mtd)
 565 {
 566         struct nand_chip *chip = mtd->priv;
 567         struct fsl_ifc_mtd *priv = chip->priv;
 568         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 569         uint16_t data;
 570
 571         /*
 572          * If there are still bytes in the IFC buffer, then use the
 573          * next byte.
 574          */
 575         if (ctrl->index < ctrl->read_bytes) {
 576                 data = in_be16((uint16_t *)&ctrl->
 577                                         addr[ctrl->index]);
 578                 ctrl->index += 2;
 579                 return (uint8_t)data;
 580         }
 581
 582         printf("%s beyond end of buffer\n", __func__);
 583         return ERR_BYTE;
 584 }
 585
 586 /*
 587  * Read from the IFC Controller Data Buffer
 588  */
 589 static void fsl_ifc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 590 {
 591         struct nand_chip *chip = mtd->priv;
 592         struct fsl_ifc_mtd *priv = chip->priv;
 593         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 594         int avail;
 595
 596         if (len < 0)
 597                 return;
 598
 599         avail = min((unsigned int)len, ctrl->read_bytes - ctrl->index);
 600         memcpy_fromio(buf, &ctrl->addr[ctrl->index], avail);
 601         ctrl->index += avail;
 602
 603         if (len > avail)
 604                 printf("%s beyond end of buffer "
 605                        "(%d requested, %d available)\n",
 606                        __func__, len, avail);
 607 }
 608
 609 /*
 610  * Verify buffer against the IFC Controller Data Buffer
 611  */
 612 static int fsl_ifc_verify_buf(struct mtd_info *mtd,
 613                                const u_char *buf, int len)
 614 {
 615         struct nand_chip *chip = mtd->priv;
 616         struct fsl_ifc_mtd *priv = chip->priv;
 617         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 618         int i;
 619
 620         if (len < 0) {
 621                 printf("%s of %d bytes", __func__, len);
 622                 return -EINVAL;
 623         }
 624
 625         if ((unsigned int)len > ctrl->read_bytes - ctrl->index) {
 626                 printf("%s beyond end of buffer "
 627                        "(%d requested, %u available)\n",
 628                        __func__, len, ctrl->read_bytes - ctrl->index);
 629
 630                 ctrl->index = ctrl->read_bytes;
 631                 return -EINVAL;
 632         }
 633
 634         for (i = 0; i < len; i++)
 635                 if (in_8(&ctrl->addr[ctrl->index + i]) != buf[i])
 636                         break;
 637
 638         ctrl->index += len;
 639         return i == len && ctrl->status == IFC_NAND_EVTER_STAT_OPC ? 0 : -EIO;
 640 }
 641
 642 /* This function is called after Program and Erase Operations to
 643  * check for success or failure.
 644  */
 645 static int fsl_ifc_wait(struct mtd_info *mtd, struct nand_chip *chip)
 646 {
 647         struct fsl_ifc_mtd *priv = chip->priv;
 648         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 649         struct fsl_ifc *ifc = ctrl->regs;
 650         u32 nand_fsr;
 651
 652         if (ctrl->status != IFC_NAND_EVTER_STAT_OPC)
 653                 return NAND_STATUS_FAIL;
 654
 655         /* Use READ_STATUS command, but wait for the device to be ready */
 656         out_be32(&ifc->ifc_nand.nand_fir0,
 657                  (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 658                  (IFC_FIR_OP_RDSTAT << IFC_NAND_FIR0_OP1_SHIFT));
 659         out_be32(&ifc->ifc_nand.nand_fcr0, NAND_CMD_STATUS <<
 660                         IFC_NAND_FCR0_CMD0_SHIFT);
 661         out_be32(&ifc->ifc_nand.nand_fbcr, 1);
 662         set_addr(mtd, 0, 0, 0);
 663         ctrl->read_bytes = 1;
 664
 665         fsl_ifc_run_command(mtd);
 666
 667         if (ctrl->status != IFC_NAND_EVTER_STAT_OPC)
 668                 return NAND_STATUS_FAIL;
 669
 670         nand_fsr = in_be32(&ifc->ifc_nand.nand_fsr);
 671
 672         /* Chip sometimes reporting write protect even when it's not */
 673         nand_fsr = nand_fsr | NAND_STATUS_WP;
 674         return nand_fsr;
 675 }
 676
 677 static int fsl_ifc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 678                              uint8_t *buf, int oob_required, int page)
 679 {
 680         struct fsl_ifc_mtd *priv = chip->priv;
 681         struct fsl_ifc_ctrl *ctrl = priv->ctrl;
 682
 683         fsl_ifc_read_buf(mtd, buf, mtd->writesize);
 684         fsl_ifc_read_buf(mtd, chip->oob_poi, mtd->oobsize);
 685
 686         if (ctrl->status != IFC_NAND_EVTER_STAT_OPC)
 687                 mtd->ecc_stats.failed++;
 688
 689         return 0;
 690 }
 691
 692 /* ECC will be calculated automatically, and errors will be detected in
 693  * waitfunc.
 694  */
 695 static int fsl_ifc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 696                                const uint8_t *buf, int oob_required)
 697 {
 698         fsl_ifc_write_buf(mtd, buf, mtd->writesize);
 699         fsl_ifc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
 700
 701         return 0;
 702 }
 703
 704 static void fsl_ifc_ctrl_init(void)
 705 {
 706         ifc_ctrl = kzalloc(sizeof(*ifc_ctrl), GFP_KERNEL);
 707         if (!ifc_ctrl)
 708                 return;
 709
 710         ifc_ctrl->regs = IFC_BASE_ADDR;
 711
 712         /* clear event registers */
 713         out_be32(&ifc_ctrl->regs->ifc_nand.nand_evter_stat, ~0U);
 714         out_be32(&ifc_ctrl->regs->ifc_nand.pgrdcmpl_evt_stat, ~0U);
 715
 716         /* Enable error and event for any detected errors */
 717         out_be32(&ifc_ctrl->regs->ifc_nand.nand_evter_en,
 718                         IFC_NAND_EVTER_EN_OPC_EN |
 719                         IFC_NAND_EVTER_EN_PGRDCMPL_EN |
 720                         IFC_NAND_EVTER_EN_FTOER_EN |
 721                         IFC_NAND_EVTER_EN_WPER_EN);
 722
 723         out_be32(&ifc_ctrl->regs->ifc_nand.ncfgr, 0x0);
 724 }
 725
 726 static void fsl_ifc_select_chip(struct mtd_info *mtd, int chip)
 727 {
 728 }
 729
 730 static void fsl_ifc_sram_init(void)
 731 {
 732         struct fsl_ifc *ifc = ifc_ctrl->regs;
 733         uint32_t cs = 0, csor = 0, csor_8k = 0, csor_ext = 0;
 734         long long end_tick;
 735
 736         cs = ifc_ctrl->cs_nand >> IFC_NAND_CSEL_SHIFT;
 737
 738         /* Save CSOR and CSOR_ext */
 739         csor = in_be32(&ifc_ctrl->regs->csor_cs[cs].csor);
 740         csor_ext = in_be32(&ifc_ctrl->regs->csor_cs[cs].csor_ext);
 741
 742         /* chage PageSize 8K and SpareSize 1K*/
 743         csor_8k = (csor & ~(CSOR_NAND_PGS_MASK)) | 0x0018C000;
 744         out_be32(&ifc_ctrl->regs->csor_cs[cs].csor, csor_8k);
 745         out_be32(&ifc_ctrl->regs->csor_cs[cs].csor_ext, 0x0000400);
 746
 747         /* READID */
 748         out_be32(&ifc->ifc_nand.nand_fir0,
 749                         (IFC_FIR_OP_CW0 << IFC_NAND_FIR0_OP0_SHIFT) |
 750                         (IFC_FIR_OP_UA  << IFC_NAND_FIR0_OP1_SHIFT) |
 751                         (IFC_FIR_OP_RB << IFC_NAND_FIR0_OP2_SHIFT));
 752         out_be32(&ifc->ifc_nand.nand_fcr0,
 753                         NAND_CMD_READID << IFC_NAND_FCR0_CMD0_SHIFT);
 754         out_be32(&ifc->ifc_nand.row3, 0x0);
 755
 756         out_be32(&ifc->ifc_nand.nand_fbcr, 0x0);
 757
 758         /* Program ROW0/COL0 */
 759         out_be32(&ifc->ifc_nand.row0, 0x0);
 760         out_be32(&ifc->ifc_nand.col0, 0x0);
 761
 762         /* set the chip select for NAND Transaction */
 763         out_be32(&ifc->ifc_nand.nand_csel, ifc_ctrl->cs_nand);
 764
 765         /* start read seq */
 766         out_be32(&ifc->ifc_nand.nandseq_strt, IFC_NAND_SEQ_STRT_FIR_STRT);
 767
 768         /* wait for NAND Machine complete flag or timeout */
 769         end_tick = usec2ticks(IFC_TIMEOUT_MSECS * 1000) + get_ticks();
 770
 771         while (end_tick > get_ticks()) {
 772                 ifc_ctrl->status = in_be32(&ifc->ifc_nand.nand_evter_stat);
 773
 774                 if (ifc_ctrl->status & IFC_NAND_EVTER_STAT_OPC)
 775                         break;
 776         }
 777
 778         out_be32(&ifc->ifc_nand.nand_evter_stat, ifc_ctrl->status);
 779
 780         /* Restore CSOR and CSOR_ext */
 781         out_be32(&ifc_ctrl->regs->csor_cs[cs].csor, csor);
 782         out_be32(&ifc_ctrl->regs->csor_cs[cs].csor_ext, csor_ext);
 783 }
 784
 785 static int fsl_ifc_chip_init(int devnum, u8 *addr)
 786 {
 787         struct mtd_info *mtd = &nand_info[devnum];
 788         struct nand_chip *nand;
 789         struct fsl_ifc_mtd *priv;
 790         struct nand_ecclayout *layout;
 791         uint32_t cspr = 0, csor = 0, ver = 0;
 792         int ret;
 793
 794         if (!ifc_ctrl) {
 795                 fsl_ifc_ctrl_init();
 796                 if (!ifc_ctrl)
 797                         return -1;
 798         }
 799
 800         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 801         if (!priv)
 802                 return -ENOMEM;
 803
 804         priv->ctrl = ifc_ctrl;
 805         priv->vbase = addr;
 806
 807         /* Find which chip select it is connected to.
 808          */
 809         for (priv->bank = 0; priv->bank < MAX_BANKS; priv->bank++) {
 810                 phys_addr_t phys_addr = virt_to_phys(addr);
 811
 812                 cspr = in_be32(&ifc_ctrl->regs->cspr_cs[priv->bank].cspr);
 813                 csor = in_be32(&ifc_ctrl->regs->csor_cs[priv->bank].csor);
 814
 815                 if ((cspr & CSPR_V) && (cspr & CSPR_MSEL) == CSPR_MSEL_NAND &&
 816                     (cspr & CSPR_BA) == CSPR_PHYS_ADDR(phys_addr)) {
 817                         ifc_ctrl->cs_nand = priv->bank << IFC_NAND_CSEL_SHIFT;
 818                         break;
 819                 }
 820         }
 821
 822         if (priv->bank >= MAX_BANKS) {
 823                 printf("%s: address did not match any "
 824                        "chip selects\n", __func__);
 825                 kfree(priv);
 826                 return -ENODEV;
 827         }
 828
 829         nand = &priv->chip;
 830         mtd->priv = nand;
 831
 832         ifc_ctrl->chips[priv->bank] = priv;
 833
 834         /* fill in nand_chip structure */
 835         /* set up function call table */
 836
 837         nand->write_buf = fsl_ifc_write_buf;
 838         nand->read_buf = fsl_ifc_read_buf;
 839         nand->verify_buf = fsl_ifc_verify_buf;
 840         nand->select_chip = fsl_ifc_select_chip;
 841         nand->cmdfunc = fsl_ifc_cmdfunc;
 842         nand->waitfunc = fsl_ifc_wait;
 843
 844         /* set up nand options */
 845         nand->bbt_td = &bbt_main_descr;
 846         nand->bbt_md = &bbt_mirror_descr;
 847
 848         /* set up nand options */
 849         nand->options = NAND_NO_SUBPAGE_WRITE;
 850         nand->bbt_options = NAND_BBT_USE_FLASH;
 851
 852         if (cspr & CSPR_PORT_SIZE_16) {
 853                 nand->read_byte = fsl_ifc_read_byte16;
 854                 nand->options |= NAND_BUSWIDTH_16;
 855         } else {
 856                 nand->read_byte = fsl_ifc_read_byte;
 857         }
 858
 859         nand->controller = &ifc_ctrl->controller;
 860         nand->priv = priv;
 861
 862         nand->ecc.read_page = fsl_ifc_read_page;
 863         nand->ecc.write_page = fsl_ifc_write_page;
 864
 865         /* Hardware generates ECC per 512 Bytes */
 866         nand->ecc.size = 512;
 867         nand->ecc.bytes = 8;
 868
 869         switch (csor & CSOR_NAND_PGS_MASK) {
 870         case CSOR_NAND_PGS_512:
 871                 if (nand->options & NAND_BUSWIDTH_16) {
 872                         layout = &oob_512_16bit_ecc4;
 873                 } else {
 874                         layout = &oob_512_8bit_ecc4;
 875
 876                         /* Avoid conflict with bad block marker */
 877                         bbt_main_descr.offs = 0;
 878                         bbt_mirror_descr.offs = 0;
 879                 }
 880
 881                 nand->ecc.strength = 4;
 882                 priv->bufnum_mask = 15;
 883                 break;
 884
 885         case CSOR_NAND_PGS_2K:
 886                 layout = &oob_2048_ecc4;
 887                 nand->ecc.strength = 4;
 888                 priv->bufnum_mask = 3;
 889                 break;
 890
 891         case CSOR_NAND_PGS_4K:
 892                 if ((csor & CSOR_NAND_ECC_MODE_MASK) ==
 893                     CSOR_NAND_ECC_MODE_4) {
 894                         layout = &oob_4096_ecc4;
 895                         nand->ecc.strength = 4;
 896                 } else {
 897                         layout = &oob_4096_ecc8;
 898                         nand->ecc.strength = 8;
 899                         nand->ecc.bytes = 16;
 900                 }
 901
 902                 priv->bufnum_mask = 1;
 903                 break;
 904
 905         default:
 906                 printf("ifc nand: bad csor %#x: bad page size\n", csor);
 907                 return -ENODEV;
 908         }
 909
 910         /* Must also set CSOR_NAND_ECC_ENC_EN if DEC_EN set */
 911         if (csor & CSOR_NAND_ECC_DEC_EN) {
 912                 nand->ecc.mode = NAND_ECC_HW;
 913                 nand->ecc.layout = layout;
 914         } else {
 915                 nand->ecc.mode = NAND_ECC_SOFT;
 916         }
 917
 918         ver = in_be32(&ifc_ctrl->regs->ifc_rev);
 919         if (ver == FSL_IFC_V1_1_0)
 920                 fsl_ifc_sram_init();
 921
 922         ret = nand_scan_ident(mtd, 1, NULL);
 923         if (ret)
 924                 return ret;
 925
 926         ret = nand_scan_tail(mtd);
 927         if (ret)
 928                 return ret;
 929
 930         ret = nand_register(devnum);
 931         if (ret)
 932                 return ret;
 933         return 0;
 934 }
 935
 936 #ifndef CONFIG_SYS_NAND_BASE_LIST
 937 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
 938 #endif
 939
 940 static unsigned long base_address[CONFIG_SYS_MAX_NAND_DEVICE] =
 941         CONFIG_SYS_NAND_BASE_LIST;
 942
 943 void board_nand_init(void)
 944 {
 945         int i;
 946
 947         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
 948                 fsl_ifc_chip_init(i, (u8 *)base_address[i]);
 949 }