drivers/mtd/nand/atmel_nand.c

   1 /*
   2  * (C) Copyright 2007-2008
   3  * Stelian Pop <stelian@popies.net>
   4  * Lead Tech Design <www.leadtechdesign.com>
   5  *
   6  * (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
   7  *
   8  * Add Programmable Multibit ECC support for various AT91 SoC
   9  *     (C) Copyright 2012 ATMEL, Hong Xu
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13
  14 #include <common.h>
  15 #include <asm/arch/hardware.h>
  16 #include <asm/arch/gpio.h>
  17 #include <asm/arch/at91_pio.h>
  18
  19 #include <malloc.h>
  20 #include <nand.h>
  21 #include <watchdog.h>
  22
  23 #ifdef CONFIG_ATMEL_NAND_HWECC
  24
  25 /* Register access macros */
  26 #define ecc_readl(add, reg)                             \
  27         readl(AT91_BASE_SYS + add + ATMEL_ECC_##reg)
  28 #define ecc_writel(add, reg, value)                     \
  29         writel((value), AT91_BASE_SYS + add + ATMEL_ECC_##reg)
  30
  31 #include "atmel_nand_ecc.h"     /* Hardware ECC registers */
  32
  33 #ifdef CONFIG_ATMEL_NAND_HW_PMECC
  34
  35 struct atmel_nand_host {
  36         struct pmecc_regs __iomem *pmecc;
  37         struct pmecc_errloc_regs __iomem *pmerrloc;
  38         void __iomem            *pmecc_rom_base;
  39
  40         u8              pmecc_corr_cap;
  41         u16             pmecc_sector_size;
  42         u32             pmecc_index_table_offset;
  43
  44         int             pmecc_bytes_per_sector;
  45         int             pmecc_sector_number;
  46         int             pmecc_degree;   /* Degree of remainders */
  47         int             pmecc_cw_len;   /* Length of codeword */
  48
  49         /* lookup table for alpha_to and index_of */
  50         void __iomem    *pmecc_alpha_to;
  51         void __iomem    *pmecc_index_of;
  52
  53         /* data for pmecc computation */
  54         int16_t *pmecc_smu;
  55         int16_t *pmecc_partial_syn;
  56         int16_t *pmecc_si;
  57         int16_t *pmecc_lmu; /* polynomal order */
  58         int     *pmecc_mu;
  59         int     *pmecc_dmu;
  60         int     *pmecc_delta;
  61 };
  62
  63 static struct atmel_nand_host pmecc_host;
  64 static struct nand_ecclayout atmel_pmecc_oobinfo;
  65
  66 /*
  67  * Return number of ecc bytes per sector according to sector size and
  68  * correction capability
  69  *
  70  * Following table shows what at91 PMECC supported:
  71  * Correction Capability        Sector_512_bytes        Sector_1024_bytes
  72  * =====================        ================        =================
  73  *                2-bits                 4-bytes                  4-bytes
  74  *                4-bits                 7-bytes                  7-bytes
  75  *                8-bits                13-bytes                 14-bytes
  76  *               12-bits                20-bytes                 21-bytes
  77  *               24-bits                39-bytes                 42-bytes
  78  */
  79 static int pmecc_get_ecc_bytes(int cap, int sector_size)
  80 {
  81         int m = 12 + sector_size / 512;
  82         return (m * cap + 7) / 8;
  83 }
  84
  85 static void pmecc_config_ecc_layout(struct nand_ecclayout *layout,
  86         int oobsize, int ecc_len)
  87 {
  88         int i;
  89
  90         layout->eccbytes = ecc_len;
  91
  92         /* ECC will occupy the last ecc_len bytes continuously */
  93         for (i = 0; i < ecc_len; i++)
  94                 layout->eccpos[i] = oobsize - ecc_len + i;
  95
  96         layout->oobfree[0].offset = 2;
  97         layout->oobfree[0].length =
  98                 oobsize - ecc_len - layout->oobfree[0].offset;
  99 }
 100
 101 static void __iomem *pmecc_get_alpha_to(struct atmel_nand_host *host)
 102 {
 103         int table_size;
 104
 105         table_size = host->pmecc_sector_size == 512 ?
 106                 PMECC_INDEX_TABLE_SIZE_512 : PMECC_INDEX_TABLE_SIZE_1024;
 107
 108         /* the ALPHA lookup table is right behind the INDEX lookup table. */
 109         return host->pmecc_rom_base + host->pmecc_index_table_offset +
 110                         table_size * sizeof(int16_t);
 111 }
 112
 113 static void pmecc_data_free(struct atmel_nand_host *host)
 114 {
 115         free(host->pmecc_partial_syn);
 116         free(host->pmecc_si);
 117         free(host->pmecc_lmu);
 118         free(host->pmecc_smu);
 119         free(host->pmecc_mu);
 120         free(host->pmecc_dmu);
 121         free(host->pmecc_delta);
 122 }
 123
 124 static int pmecc_data_alloc(struct atmel_nand_host *host)
 125 {
 126         const int cap = host->pmecc_corr_cap;
 127         int size;
 128
 129         size = (2 * cap + 1) * sizeof(int16_t);
 130         host->pmecc_partial_syn = malloc(size);
 131         host->pmecc_si = malloc(size);
 132         host->pmecc_lmu = malloc((cap + 1) * sizeof(int16_t));
 133         host->pmecc_smu = malloc((cap + 2) * size);
 134
 135         size = (cap + 1) * sizeof(int);
 136         host->pmecc_mu = malloc(size);
 137         host->pmecc_dmu = malloc(size);
 138         host->pmecc_delta = malloc(size);
 139
 140         if (host->pmecc_partial_syn &&
 141                         host->pmecc_si &&
 142                         host->pmecc_lmu &&
 143                         host->pmecc_smu &&
 144                         host->pmecc_mu &&
 145                         host->pmecc_dmu &&
 146                         host->pmecc_delta)
 147                 return 0;
 148
 149         /* error happened */
 150         pmecc_data_free(host);
 151         return -ENOMEM;
 152
 153 }
 154
 155 static void pmecc_gen_syndrome(struct mtd_info *mtd, int sector)
 156 {
 157         struct nand_chip *nand_chip = mtd->priv;
 158         struct atmel_nand_host *host = nand_chip->priv;
 159         int i;
 160         uint32_t value;
 161
 162         /* Fill odd syndromes */
 163         for (i = 0; i < host->pmecc_corr_cap; i++) {
 164                 value = readl(&host->pmecc->rem_port[sector].rem[i / 2]);
 165                 if (i & 1)
 166                         value >>= 16;
 167                 value &= 0xffff;
 168                 host->pmecc_partial_syn[(2 * i) + 1] = (int16_t)value;
 169         }
 170 }
 171
 172 static void pmecc_substitute(struct mtd_info *mtd)
 173 {
 174         struct nand_chip *nand_chip = mtd->priv;
 175         struct atmel_nand_host *host = nand_chip->priv;
 176         int16_t __iomem *alpha_to = host->pmecc_alpha_to;
 177         int16_t __iomem *index_of = host->pmecc_index_of;
 178         int16_t *partial_syn = host->pmecc_partial_syn;
 179         const int cap = host->pmecc_corr_cap;
 180         int16_t *si;
 181         int i, j;
 182
 183         /* si[] is a table that holds the current syndrome value,
 184          * an element of that table belongs to the field
 185          */
 186         si = host->pmecc_si;
 187
 188         memset(&si[1], 0, sizeof(int16_t) * (2 * cap - 1));
 189
 190         /* Computation 2t syndromes based on S(x) */
 191         /* Odd syndromes */
 192         for (i = 1; i < 2 * cap; i += 2) {
 193                 for (j = 0; j < host->pmecc_degree; j++) {
 194                         if (partial_syn[i] & (0x1 << j))
 195                                 si[i] = readw(alpha_to + i * j) ^ si[i];
 196                 }
 197         }
 198         /* Even syndrome = (Odd syndrome) ** 2 */
 199         for (i = 2, j = 1; j <= cap; i = ++j << 1) {
 200                 if (si[j] == 0) {
 201                         si[i] = 0;
 202                 } else {
 203                         int16_t tmp;
 204
 205                         tmp = readw(index_of + si[j]);
 206                         tmp = (tmp * 2) % host->pmecc_cw_len;
 207                         si[i] = readw(alpha_to + tmp);
 208                 }
 209         }
 210 }
 211
 212 /*
 213  * This function defines a Berlekamp iterative procedure for
 214  * finding the value of the error location polynomial.
 215  * The input is si[], initialize by pmecc_substitute().
 216  * The output is smu[][].
 217  *
 218  * This function is written according to chip datasheet Chapter:
 219  * Find the Error Location Polynomial Sigma(x) of Section:
 220  * Programmable Multibit ECC Control (PMECC).
 221  */
 222 static void pmecc_get_sigma(struct mtd_info *mtd)
 223 {
 224         struct nand_chip *nand_chip = mtd->priv;
 225         struct atmel_nand_host *host = nand_chip->priv;
 226
 227         int16_t *lmu = host->pmecc_lmu;
 228         int16_t *si = host->pmecc_si;
 229         int *mu = host->pmecc_mu;
 230         int *dmu = host->pmecc_dmu;     /* Discrepancy */
 231         int *delta = host->pmecc_delta; /* Delta order */
 232         int cw_len = host->pmecc_cw_len;
 233         const int16_t cap = host->pmecc_corr_cap;
 234         const int num = 2 * cap + 1;
 235         int16_t __iomem *index_of = host->pmecc_index_of;
 236         int16_t __iomem *alpha_to = host->pmecc_alpha_to;
 237         int i, j, k;
 238         uint32_t dmu_0_count, tmp;
 239         int16_t *smu = host->pmecc_smu;
 240
 241         /* index of largest delta */
 242         int ro;
 243         int largest;
 244         int diff;
 245
 246         /* Init the Sigma(x) */
 247         memset(smu, 0, sizeof(int16_t) * ARRAY_SIZE(smu));
 248
 249         dmu_0_count = 0;
 250
 251         /* First Row */
 252
 253         /* Mu */
 254         mu[0] = -1;
 255
 256         smu[0] = 1;
 257
 258         /* discrepancy set to 1 */
 259         dmu[0] = 1;
 260         /* polynom order set to 0 */
 261         lmu[0] = 0;
 262         /* delta[0] = (mu[0] * 2 - lmu[0]) >> 1; */
 263         delta[0] = -1;
 264
 265         /* Second Row */
 266
 267         /* Mu */
 268         mu[1] = 0;
 269         /* Sigma(x) set to 1 */
 270         smu[num] = 1;
 271
 272         /* discrepancy set to S1 */
 273         dmu[1] = si[1];
 274
 275         /* polynom order set to 0 */
 276         lmu[1] = 0;
 277
 278         /* delta[1] = (mu[1] * 2 - lmu[1]) >> 1; */
 279         delta[1] = 0;
 280
 281         for (i = 1; i <= cap; i++) {
 282                 mu[i + 1] = i << 1;
 283                 /* Begin Computing Sigma (Mu+1) and L(mu) */
 284                 /* check if discrepancy is set to 0 */
 285                 if (dmu[i] == 0) {
 286                         dmu_0_count++;
 287
 288                         tmp = ((cap - (lmu[i] >> 1) - 1) / 2);
 289                         if ((cap - (lmu[i] >> 1) - 1) & 0x1)
 290                                 tmp += 2;
 291                         else
 292                                 tmp += 1;
 293
 294                         if (dmu_0_count == tmp) {
 295                                 for (j = 0; j <= (lmu[i] >> 1) + 1; j++)
 296                                         smu[(cap + 1) * num + j] =
 297                                                         smu[i * num + j];
 298
 299                                 lmu[cap + 1] = lmu[i];
 300                                 return;
 301                         }
 302
 303                         /* copy polynom */
 304                         for (j = 0; j <= lmu[i] >> 1; j++)
 305                                 smu[(i + 1) * num + j] = smu[i * num + j];
 306
 307                         /* copy previous polynom order to the next */
 308                         lmu[i + 1] = lmu[i];
 309                 } else {
 310                         ro = 0;
 311                         largest = -1;
 312                         /* find largest delta with dmu != 0 */
 313                         for (j = 0; j < i; j++) {
 314                                 if ((dmu[j]) && (delta[j] > largest)) {
 315                                         largest = delta[j];
 316                                         ro = j;
 317                                 }
 318                         }
 319
 320                         /* compute difference */
 321                         diff = (mu[i] - mu[ro]);
 322
 323                         /* Compute degree of the new smu polynomial */
 324                         if ((lmu[i] >> 1) > ((lmu[ro] >> 1) + diff))
 325                                 lmu[i + 1] = lmu[i];
 326                         else
 327                                 lmu[i + 1] = ((lmu[ro] >> 1) + diff) * 2;
 328
 329                         /* Init smu[i+1] with 0 */
 330                         for (k = 0; k < num; k++)
 331                                 smu[(i + 1) * num + k] = 0;
 332
 333                         /* Compute smu[i+1] */
 334                         for (k = 0; k <= lmu[ro] >> 1; k++) {
 335                                 int16_t a, b, c;
 336
 337                                 if (!(smu[ro * num + k] && dmu[i]))
 338                                         continue;
 339                                 a = readw(index_of + dmu[i]);
 340                                 b = readw(index_of + dmu[ro]);
 341                                 c = readw(index_of + smu[ro * num + k]);
 342                                 tmp = a + (cw_len - b) + c;
 343                                 a = readw(alpha_to + tmp % cw_len);
 344                                 smu[(i + 1) * num + (k + diff)] = a;
 345                         }
 346
 347                         for (k = 0; k <= lmu[i] >> 1; k++)
 348                                 smu[(i + 1) * num + k] ^= smu[i * num + k];
 349                 }
 350
 351                 /* End Computing Sigma (Mu+1) and L(mu) */
 352                 /* In either case compute delta */
 353                 delta[i + 1] = (mu[i + 1] * 2 - lmu[i + 1]) >> 1;
 354
 355                 /* Do not compute discrepancy for the last iteration */
 356                 if (i >= cap)
 357                         continue;
 358
 359                 for (k = 0; k <= (lmu[i + 1] >> 1); k++) {
 360                         tmp = 2 * (i - 1);
 361                         if (k == 0) {
 362                                 dmu[i + 1] = si[tmp + 3];
 363                         } else if (smu[(i + 1) * num + k] && si[tmp + 3 - k]) {
 364                                 int16_t a, b, c;
 365                                 a = readw(index_of +
 366                                                 smu[(i + 1) * num + k]);
 367                                 b = si[2 * (i - 1) + 3 - k];
 368                                 c = readw(index_of + b);
 369                                 tmp = a + c;
 370                                 tmp %= cw_len;
 371                                 dmu[i + 1] = readw(alpha_to + tmp) ^
 372                                         dmu[i + 1];
 373                         }
 374                 }
 375         }
 376 }
 377
 378 static int pmecc_err_location(struct mtd_info *mtd)
 379 {
 380         struct nand_chip *nand_chip = mtd->priv;
 381         struct atmel_nand_host *host = nand_chip->priv;
 382         const int cap = host->pmecc_corr_cap;
 383         const int num = 2 * cap + 1;
 384         int sector_size = host->pmecc_sector_size;
 385         int err_nbr = 0;        /* number of error */
 386         int roots_nbr;          /* number of roots */
 387         int i;
 388         uint32_t val;
 389         int16_t *smu = host->pmecc_smu;
 390         int timeout = PMECC_MAX_TIMEOUT_US;
 391
 392         writel(PMERRLOC_DISABLE, &host->pmerrloc->eldis);
 393
 394         for (i = 0; i <= host->pmecc_lmu[cap + 1] >> 1; i++) {
 395                 writel(smu[(cap + 1) * num + i], &host->pmerrloc->sigma[i]);
 396                 err_nbr++;
 397         }
 398
 399         val = PMERRLOC_ELCFG_NUM_ERRORS(err_nbr - 1);
 400         if (sector_size == 1024)
 401                 val |= PMERRLOC_ELCFG_SECTOR_1024;
 402
 403         writel(val, &host->pmerrloc->elcfg);
 404         writel(sector_size * 8 + host->pmecc_degree * cap,
 405                         &host->pmerrloc->elen);
 406
 407         while (--timeout) {
 408                 if (readl(&host->pmerrloc->elisr) & PMERRLOC_CALC_DONE)
 409                         break;
 410                 WATCHDOG_RESET();
 411                 udelay(1);
 412         }
 413
 414         if (!timeout) {
 415                 printk(KERN_ERR "atmel_nand : Timeout to calculate PMECC error location\n");
 416                 return -1;
 417         }
 418
 419         roots_nbr = (readl(&host->pmerrloc->elisr) & PMERRLOC_ERR_NUM_MASK)
 420                         >> 8;
 421         /* Number of roots == degree of smu hence <= cap */
 422         if (roots_nbr == host->pmecc_lmu[cap + 1] >> 1)
 423                 return err_nbr - 1;
 424
 425         /* Number of roots does not match the degree of smu
 426          * unable to correct error */
 427         return -1;
 428 }
 429
 430 static void pmecc_correct_data(struct mtd_info *mtd, uint8_t *buf, uint8_t *ecc,
 431                 int sector_num, int extra_bytes, int err_nbr)
 432 {
 433         struct nand_chip *nand_chip = mtd->priv;
 434         struct atmel_nand_host *host = nand_chip->priv;
 435         int i = 0;
 436         int byte_pos, bit_pos, sector_size, pos;
 437         uint32_t tmp;
 438         uint8_t err_byte;
 439
 440         sector_size = host->pmecc_sector_size;
 441
 442         while (err_nbr) {
 443                 tmp = readl(&host->pmerrloc->el[i]) - 1;
 444                 byte_pos = tmp / 8;
 445                 bit_pos  = tmp % 8;
 446
 447                 if (byte_pos >= (sector_size + extra_bytes))
 448                         BUG();  /* should never happen */
 449
 450                 if (byte_pos < sector_size) {
 451                         err_byte = *(buf + byte_pos);
 452                         *(buf + byte_pos) ^= (1 << bit_pos);
 453
 454                         pos = sector_num * host->pmecc_sector_size + byte_pos;
 455                         printk(KERN_INFO "Bit flip in data area, byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 456                                 pos, bit_pos, err_byte, *(buf + byte_pos));
 457                 } else {
 458                         /* Bit flip in OOB area */
 459                         tmp = sector_num * host->pmecc_bytes_per_sector
 460                                         + (byte_pos - sector_size);
 461                         err_byte = ecc[tmp];
 462                         ecc[tmp] ^= (1 << bit_pos);
 463
 464                         pos = tmp + nand_chip->ecc.layout->eccpos[0];
 465                         printk(KERN_INFO "Bit flip in OOB, oob_byte_pos: %d, bit_pos: %d, 0x%02x -> 0x%02x\n",
 466                                 pos, bit_pos, err_byte, ecc[tmp]);
 467                 }
 468
 469                 i++;
 470                 err_nbr--;
 471         }
 472
 473         return;
 474 }
 475
 476 static int pmecc_correction(struct mtd_info *mtd, u32 pmecc_stat, uint8_t *buf,
 477         u8 *ecc)
 478 {
 479         struct nand_chip *nand_chip = mtd->priv;
 480         struct atmel_nand_host *host = nand_chip->priv;
 481         int i, err_nbr, eccbytes;
 482         uint8_t *buf_pos;
 483
 484         eccbytes = nand_chip->ecc.bytes;
 485         for (i = 0; i < eccbytes; i++)
 486                 if (ecc[i] != 0xff)
 487                         goto normal_check;
 488         /* Erased page, return OK */
 489         return 0;
 490
 491 normal_check:
 492         for (i = 0; i < host->pmecc_sector_number; i++) {
 493                 err_nbr = 0;
 494                 if (pmecc_stat & 0x1) {
 495                         buf_pos = buf + i * host->pmecc_sector_size;
 496
 497                         pmecc_gen_syndrome(mtd, i);
 498                         pmecc_substitute(mtd);
 499                         pmecc_get_sigma(mtd);
 500
 501                         err_nbr = pmecc_err_location(mtd);
 502                         if (err_nbr == -1) {
 503                                 printk(KERN_ERR "PMECC: Too many errors\n");
 504                                 mtd->ecc_stats.failed++;
 505                                 return -EIO;
 506                         } else {
 507                                 pmecc_correct_data(mtd, buf_pos, ecc, i,
 508                                         host->pmecc_bytes_per_sector, err_nbr);
 509                                 mtd->ecc_stats.corrected += err_nbr;
 510                         }
 511                 }
 512                 pmecc_stat >>= 1;
 513         }
 514
 515         return 0;
 516 }
 517
 518 static int atmel_nand_pmecc_read_page(struct mtd_info *mtd,
 519         struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
 520 {
 521         struct atmel_nand_host *host = chip->priv;
 522         int eccsize = chip->ecc.size;
 523         uint8_t *oob = chip->oob_poi;
 524         uint32_t *eccpos = chip->ecc.layout->eccpos;
 525         uint32_t stat;
 526         int timeout = PMECC_MAX_TIMEOUT_US;
 527
 528         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST);
 529         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE);
 530         pmecc_writel(host->pmecc, cfg, ((pmecc_readl(host->pmecc, cfg))
 531                 & ~PMECC_CFG_WRITE_OP) | PMECC_CFG_AUTO_ENABLE);
 532
 533         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE);
 534         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DATA);
 535
 536         chip->read_buf(mtd, buf, eccsize);
 537         chip->read_buf(mtd, oob, mtd->oobsize);
 538
 539         while (--timeout) {
 540                 if (!(pmecc_readl(host->pmecc, sr) & PMECC_SR_BUSY))
 541                         break;
 542                 WATCHDOG_RESET();
 543                 udelay(1);
 544         }
 545
 546         if (!timeout) {
 547                 printk(KERN_ERR "atmel_nand : Timeout to read PMECC page\n");
 548                 return -1;
 549         }
 550
 551         stat = pmecc_readl(host->pmecc, isr);
 552         if (stat != 0)
 553                 if (pmecc_correction(mtd, stat, buf, &oob[eccpos[0]]) != 0)
 554                         return -EIO;
 555
 556         return 0;
 557 }
 558
 559 static int atmel_nand_pmecc_write_page(struct mtd_info *mtd,
 560                 struct nand_chip *chip, const uint8_t *buf,
 561                 int oob_required)
 562 {
 563         struct atmel_nand_host *host = chip->priv;
 564         uint32_t *eccpos = chip->ecc.layout->eccpos;
 565         int i, j;
 566         int timeout = PMECC_MAX_TIMEOUT_US;
 567
 568         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST);
 569         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE);
 570
 571         pmecc_writel(host->pmecc, cfg, (pmecc_readl(host->pmecc, cfg) |
 572                 PMECC_CFG_WRITE_OP) & ~PMECC_CFG_AUTO_ENABLE);
 573
 574         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE);
 575         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DATA);
 576
 577         chip->write_buf(mtd, (u8 *)buf, mtd->writesize);
 578
 579         while (--timeout) {
 580                 if (!(pmecc_readl(host->pmecc, sr) & PMECC_SR_BUSY))
 581                         break;
 582                 WATCHDOG_RESET();
 583                 udelay(1);
 584         }
 585
 586         if (!timeout) {
 587                 printk(KERN_ERR "atmel_nand : Timeout to read PMECC status, fail to write PMECC in oob\n");
 588                 goto out;
 589         }
 590
 591         for (i = 0; i < host->pmecc_sector_number; i++) {
 592                 for (j = 0; j < host->pmecc_bytes_per_sector; j++) {
 593                         int pos;
 594
 595                         pos = i * host->pmecc_bytes_per_sector + j;
 596                         chip->oob_poi[eccpos[pos]] =
 597                                 readb(&host->pmecc->ecc_port[i].ecc[j]);
 598                 }
 599         }
 600         chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
 601 out:
 602         return 0;
 603 }
 604
 605 static void atmel_pmecc_core_init(struct mtd_info *mtd)
 606 {
 607         struct nand_chip *nand_chip = mtd->priv;
 608         struct atmel_nand_host *host = nand_chip->priv;
 609         uint32_t val = 0;
 610         struct nand_ecclayout *ecc_layout;
 611
 612         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_RST);
 613         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_DISABLE);
 614
 615         switch (host->pmecc_corr_cap) {
 616         case 2:
 617                 val = PMECC_CFG_BCH_ERR2;
 618                 break;
 619         case 4:
 620                 val = PMECC_CFG_BCH_ERR4;
 621                 break;
 622         case 8:
 623                 val = PMECC_CFG_BCH_ERR8;
 624                 break;
 625         case 12:
 626                 val = PMECC_CFG_BCH_ERR12;
 627                 break;
 628         case 24:
 629                 val = PMECC_CFG_BCH_ERR24;
 630                 break;
 631         }
 632
 633         if (host->pmecc_sector_size == 512)
 634                 val |= PMECC_CFG_SECTOR512;
 635         else if (host->pmecc_sector_size == 1024)
 636                 val |= PMECC_CFG_SECTOR1024;
 637
 638         switch (host->pmecc_sector_number) {
 639         case 1:
 640                 val |= PMECC_CFG_PAGE_1SECTOR;
 641                 break;
 642         case 2:
 643                 val |= PMECC_CFG_PAGE_2SECTORS;
 644                 break;
 645         case 4:
 646                 val |= PMECC_CFG_PAGE_4SECTORS;
 647                 break;
 648         case 8:
 649                 val |= PMECC_CFG_PAGE_8SECTORS;
 650                 break;
 651         }
 652
 653         val |= (PMECC_CFG_READ_OP | PMECC_CFG_SPARE_DISABLE
 654                 | PMECC_CFG_AUTO_DISABLE);
 655         pmecc_writel(host->pmecc, cfg, val);
 656
 657         ecc_layout = nand_chip->ecc.layout;
 658         pmecc_writel(host->pmecc, sarea, mtd->oobsize - 1);
 659         pmecc_writel(host->pmecc, saddr, ecc_layout->eccpos[0]);
 660         pmecc_writel(host->pmecc, eaddr,
 661                         ecc_layout->eccpos[ecc_layout->eccbytes - 1]);
 662         /* See datasheet about PMECC Clock Control Register */
 663         pmecc_writel(host->pmecc, clk, PMECC_CLK_133MHZ);
 664         pmecc_writel(host->pmecc, idr, 0xff);
 665         pmecc_writel(host->pmecc, ctrl, PMECC_CTRL_ENABLE);
 666 }
 667
 668 #ifdef CONFIG_SYS_NAND_ONFI_DETECTION
 669 /*
 670  * get_onfi_ecc_param - Get ECC requirement from ONFI parameters
 671  * @ecc_bits: store the ONFI ECC correct bits capbility
 672  * @sector_size: in how many bytes that ONFI require to correct @ecc_bits
 673  *
 674  * Returns -1 if ONFI parameters is not supported. In this case @ecc_bits,
 675  * @sector_size are initialize to 0.
 676  * Return 0 if success to get the ECC requirement.
 677  */
 678 static int get_onfi_ecc_param(struct nand_chip *chip,
 679                 int *ecc_bits, int *sector_size)
 680 {
 681         *ecc_bits = *sector_size = 0;
 682
 683         if (chip->onfi_params.ecc_bits == 0xff)
 684                 /* TODO: the sector_size and ecc_bits need to be find in
 685                  * extended ecc parameter, currently we don't support it.
 686                  */
 687                 return -1;
 688
 689         *ecc_bits = chip->onfi_params.ecc_bits;
 690
 691         /* The default sector size (ecc codeword size) is 512 */
 692         *sector_size = 512;
 693
 694         return 0;
 695 }
 696
 697 /*
 698  * pmecc_choose_ecc - Get ecc requirement from ONFI parameters. If
 699  *                    pmecc_corr_cap or pmecc_sector_size is 0, then set it as
 700  *                    ONFI ECC parameters.
 701  * @host: point to an atmel_nand_host structure.
 702  *        if host->pmecc_corr_cap is 0 then set it as the ONFI ecc_bits.
 703  *        if host->pmecc_sector_size is 0 then set it as the ONFI sector_size.
 704  * @chip: point to an nand_chip structure.
 705  * @cap: store the ONFI ECC correct bits capbility
 706  * @sector_size: in how many bytes that ONFI require to correct @ecc_bits
 707  *
 708  * Return 0 if success. otherwise return the error code.
 709  */
 710 static int pmecc_choose_ecc(struct atmel_nand_host *host,
 711                 struct nand_chip *chip,
 712                 int *cap, int *sector_size)
 713 {
 714         /* Get ECC requirement from ONFI parameters */
 715         *cap = *sector_size = 0;
 716         if (chip->onfi_version) {
 717                 if (!get_onfi_ecc_param(chip, cap, sector_size)) {
 718                         MTDDEBUG(MTD_DEBUG_LEVEL1, "ONFI params, minimum required ECC: %d bits in %d bytes\n",
 719                                 *cap, *sector_size);
 720                 } else {
 721                         dev_info(host->dev, "NAND chip ECC reqirement is in Extended ONFI parameter, we don't support yet.\n");
 722                 }
 723         } else {
 724                 dev_info(host->dev, "NAND chip is not ONFI compliant, assume ecc_bits is 2 in 512 bytes");
 725         }
 726         if (*cap == 0 && *sector_size == 0) {
 727                 /* Non-ONFI compliant or use extended ONFI parameters */
 728                 *cap = 2;
 729                 *sector_size = 512;
 730         }
 731
 732         /* If head file doesn't specify then use the one in ONFI parameters */
 733         if (host->pmecc_corr_cap == 0) {
 734                 /* use the most fitable ecc bits (the near bigger one ) */
 735                 if (*cap <= 2)
 736                         host->pmecc_corr_cap = 2;
 737                 else if (*cap <= 4)
 738                         host->pmecc_corr_cap = 4;
 739                 else if (*cap <= 8)
 740                         host->pmecc_corr_cap = 8;
 741                 else if (*cap <= 12)
 742                         host->pmecc_corr_cap = 12;
 743                 else if (*cap <= 24)
 744                         host->pmecc_corr_cap = 24;
 745                 else
 746                         return -EINVAL;
 747         }
 748         if (host->pmecc_sector_size == 0) {
 749                 /* use the most fitable sector size (the near smaller one ) */
 750                 if (*sector_size >= 1024)
 751                         host->pmecc_sector_size = 1024;
 752                 else if (*sector_size >= 512)
 753                         host->pmecc_sector_size = 512;
 754                 else
 755                         return -EINVAL;
 756         }
 757         return 0;
 758 }
 759 #endif
 760
 761 static int atmel_pmecc_nand_init_params(struct nand_chip *nand,
 762                 struct mtd_info *mtd)
 763 {
 764         struct atmel_nand_host *host;
 765         int cap, sector_size;
 766
 767         host = nand->priv = &pmecc_host;
 768
 769         nand->ecc.mode = NAND_ECC_HW;
 770         nand->ecc.calculate = NULL;
 771         nand->ecc.correct = NULL;
 772         nand->ecc.hwctl = NULL;
 773
 774 #ifdef CONFIG_SYS_NAND_ONFI_DETECTION
 775         host->pmecc_corr_cap = host->pmecc_sector_size = 0;
 776
 777 #ifdef CONFIG_PMECC_CAP
 778         host->pmecc_corr_cap = CONFIG_PMECC_CAP;
 779 #endif
 780 #ifdef CONFIG_PMECC_SECTOR_SIZE
 781         host->pmecc_sector_size = CONFIG_PMECC_SECTOR_SIZE;
 782 #endif
 783         /* Get ECC requirement of ONFI parameters. And if CONFIG_PMECC_CAP or
 784          * CONFIG_PMECC_SECTOR_SIZE not defined, then use ecc_bits, sector_size
 785          * from ONFI.
 786          */
 787         if (pmecc_choose_ecc(host, nand, &cap, &sector_size)) {
 788                 dev_err(host->dev, "The NAND flash's ECC requirement(ecc_bits: %d, sector_size: %d) are not support!",
 789                                 cap, sector_size);
 790                 return -EINVAL;
 791         }
 792
 793         if (cap > host->pmecc_corr_cap)
 794                 dev_info(host->dev, "WARNING: Using different ecc correct bits(%d bit) from Nand ONFI ECC reqirement (%d bit).\n",
 795                                 host->pmecc_corr_cap, cap);
 796         if (sector_size < host->pmecc_sector_size)
 797                 dev_info(host->dev, "WARNING: Using different ecc correct sector size (%d bytes) from Nand ONFI ECC reqirement (%d bytes).\n",
 798                                 host->pmecc_sector_size, sector_size);
 799 #else   /* CONFIG_SYS_NAND_ONFI_DETECTION */
 800         host->pmecc_corr_cap = CONFIG_PMECC_CAP;
 801         host->pmecc_sector_size = CONFIG_PMECC_SECTOR_SIZE;
 802 #endif
 803
 804         cap = host->pmecc_corr_cap;
 805         sector_size = host->pmecc_sector_size;
 806
 807         /* TODO: need check whether cap & sector_size is validate */
 808
 809         if (host->pmecc_sector_size == 512)
 810                 host->pmecc_index_table_offset = ATMEL_PMECC_INDEX_OFFSET_512;
 811         else
 812                 host->pmecc_index_table_offset = ATMEL_PMECC_INDEX_OFFSET_1024;
 813
 814         MTDDEBUG(MTD_DEBUG_LEVEL1,
 815                 "Initialize PMECC params, cap: %d, sector: %d\n",
 816                 cap, sector_size);
 817
 818         host->pmecc = (struct pmecc_regs __iomem *) ATMEL_BASE_PMECC;
 819         host->pmerrloc = (struct pmecc_errloc_regs __iomem *)
 820                         ATMEL_BASE_PMERRLOC;
 821         host->pmecc_rom_base = (void __iomem *) ATMEL_BASE_ROM;
 822
 823         /* ECC is calculated for the whole page (1 step) */
 824         nand->ecc.size = mtd->writesize;
 825
 826         /* set ECC page size and oob layout */
 827         switch (mtd->writesize) {
 828         case 2048:
 829         case 4096:
 830                 host->pmecc_degree = (sector_size == 512) ?
 831                         PMECC_GF_DIMENSION_13 : PMECC_GF_DIMENSION_14;
 832                 host->pmecc_cw_len = (1 << host->pmecc_degree) - 1;
 833                 host->pmecc_sector_number = mtd->writesize / sector_size;
 834                 host->pmecc_bytes_per_sector = pmecc_get_ecc_bytes(
 835                         cap, sector_size);
 836                 host->pmecc_alpha_to = pmecc_get_alpha_to(host);
 837                 host->pmecc_index_of = host->pmecc_rom_base +
 838                         host->pmecc_index_table_offset;
 839
 840                 nand->ecc.steps = 1;
 841                 nand->ecc.bytes = host->pmecc_bytes_per_sector *
 842                                        host->pmecc_sector_number;
 843                 if (nand->ecc.bytes > mtd->oobsize - 2) {
 844                         printk(KERN_ERR "No room for ECC bytes\n");
 845                         return -EINVAL;
 846                 }
 847                 pmecc_config_ecc_layout(&atmel_pmecc_oobinfo,
 848                                         mtd->oobsize,
 849                                         nand->ecc.bytes);
 850                 nand->ecc.layout = &atmel_pmecc_oobinfo;
 851                 break;
 852         case 512:
 853         case 1024:
 854                 /* TODO */
 855                 printk(KERN_ERR "Unsupported page size for PMECC, use Software ECC\n");
 856         default:
 857                 /* page size not handled by HW ECC */
 858                 /* switching back to soft ECC */
 859                 nand->ecc.mode = NAND_ECC_SOFT;
 860                 nand->ecc.read_page = NULL;
 861                 nand->ecc.postpad = 0;
 862                 nand->ecc.prepad = 0;
 863                 nand->ecc.bytes = 0;
 864                 return 0;
 865         }
 866
 867         /* Allocate data for PMECC computation */
 868         if (pmecc_data_alloc(host)) {
 869                 dev_err(host->dev, "Cannot allocate memory for PMECC computation!\n");
 870                 return -ENOMEM;
 871         }
 872
 873         nand->ecc.read_page = atmel_nand_pmecc_read_page;
 874         nand->ecc.write_page = atmel_nand_pmecc_write_page;
 875         nand->ecc.strength = cap;
 876
 877         atmel_pmecc_core_init(mtd);
 878
 879         return 0;
 880 }
 881
 882 #else
 883
 884 /* oob layout for large page size
 885  * bad block info is on bytes 0 and 1
 886  * the bytes have to be consecutives to avoid
 887  * several NAND_CMD_RNDOUT during read
 888  */
 889 static struct nand_ecclayout atmel_oobinfo_large = {
 890         .eccbytes = 4,
 891         .eccpos = {60, 61, 62, 63},
 892         .oobfree = {
 893                 {2, 58}
 894         },
 895 };
 896
 897 /* oob layout for small page size
 898  * bad block info is on bytes 4 and 5
 899  * the bytes have to be consecutives to avoid
 900  * several NAND_CMD_RNDOUT during read
 901  */
 902 static struct nand_ecclayout atmel_oobinfo_small = {
 903         .eccbytes = 4,
 904         .eccpos = {0, 1, 2, 3},
 905         .oobfree = {
 906                 {6, 10}
 907         },
 908 };
 909
 910 /*
 911  * Calculate HW ECC
 912  *
 913  * function called after a write
 914  *
 915  * mtd:        MTD block structure
 916  * dat:        raw data (unused)
 917  * ecc_code:   buffer for ECC
 918  */
 919 static int atmel_nand_calculate(struct mtd_info *mtd,
 920                 const u_char *dat, unsigned char *ecc_code)
 921 {
 922         unsigned int ecc_value;
 923
 924         /* get the first 2 ECC bytes */
 925         ecc_value = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR);
 926
 927         ecc_code[0] = ecc_value & 0xFF;
 928         ecc_code[1] = (ecc_value >> 8) & 0xFF;
 929
 930         /* get the last 2 ECC bytes */
 931         ecc_value = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, NPR) & ATMEL_ECC_NPARITY;
 932
 933         ecc_code[2] = ecc_value & 0xFF;
 934         ecc_code[3] = (ecc_value >> 8) & 0xFF;
 935
 936         return 0;
 937 }
 938
 939 /*
 940  * HW ECC read page function
 941  *
 942  * mtd:        mtd info structure
 943  * chip:       nand chip info structure
 944  * buf:        buffer to store read data
 945  * oob_required:    caller expects OOB data read to chip->oob_poi
 946  */
 947 static int atmel_nand_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 948                                 uint8_t *buf, int oob_required, int page)
 949 {
 950         int eccsize = chip->ecc.size;
 951         int eccbytes = chip->ecc.bytes;
 952         uint32_t *eccpos = chip->ecc.layout->eccpos;
 953         uint8_t *p = buf;
 954         uint8_t *oob = chip->oob_poi;
 955         uint8_t *ecc_pos;
 956         int stat;
 957
 958         /* read the page */
 959         chip->read_buf(mtd, p, eccsize);
 960
 961         /* move to ECC position if needed */
 962         if (eccpos[0] != 0) {
 963                 /* This only works on large pages
 964                  * because the ECC controller waits for
 965                  * NAND_CMD_RNDOUTSTART after the
 966                  * NAND_CMD_RNDOUT.
 967                  * anyway, for small pages, the eccpos[0] == 0
 968                  */
 969                 chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
 970                                 mtd->writesize + eccpos[0], -1);
 971         }
 972
 973         /* the ECC controller needs to read the ECC just after the data */
 974         ecc_pos = oob + eccpos[0];
 975         chip->read_buf(mtd, ecc_pos, eccbytes);
 976
 977         /* check if there's an error */
 978         stat = chip->ecc.correct(mtd, p, oob, NULL);
 979
 980         if (stat < 0)
 981                 mtd->ecc_stats.failed++;
 982         else
 983                 mtd->ecc_stats.corrected += stat;
 984
 985         /* get back to oob start (end of page) */
 986         chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
 987
 988         /* read the oob */
 989         chip->read_buf(mtd, oob, mtd->oobsize);
 990
 991         return 0;
 992 }
 993
 994 /*
 995  * HW ECC Correction
 996  *
 997  * function called after a read
 998  *
 999  * mtd:        MTD block structure
1000  * dat:        raw data read from the chip
1001  * read_ecc:   ECC from the chip (unused)
1002  * isnull:     unused
1003  *
1004  * Detect and correct a 1 bit error for a page
1005  */
1006 static int atmel_nand_correct(struct mtd_info *mtd, u_char *dat,
1007                 u_char *read_ecc, u_char *isnull)
1008 {
1009         struct nand_chip *nand_chip = mtd->priv;
1010         unsigned int ecc_status;
1011         unsigned int ecc_word, ecc_bit;
1012
1013         /* get the status from the Status Register */
1014         ecc_status = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, SR);
1015
1016         /* if there's no error */
1017         if (likely(!(ecc_status & ATMEL_ECC_RECERR)))
1018                 return 0;
1019
1020         /* get error bit offset (4 bits) */
1021         ecc_bit = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR) & ATMEL_ECC_BITADDR;
1022         /* get word address (12 bits) */
1023         ecc_word = ecc_readl(CONFIG_SYS_NAND_ECC_BASE, PR) & ATMEL_ECC_WORDADDR;
1024         ecc_word >>= 4;
1025
1026         /* if there are multiple errors */
1027         if (ecc_status & ATMEL_ECC_MULERR) {
1028                 /* check if it is a freshly erased block
1029                  * (filled with 0xff) */
1030                 if ((ecc_bit == ATMEL_ECC_BITADDR)
1031                                 && (ecc_word == (ATMEL_ECC_WORDADDR >> 4))) {
1032                         /* the block has just been erased, return OK */
1033                         return 0;
1034                 }
1035                 /* it doesn't seems to be a freshly
1036                  * erased block.
1037                  * We can't correct so many errors */
1038                 printk(KERN_WARNING "atmel_nand : multiple errors detected."
1039                                 " Unable to correct.\n");
1040                 return -EIO;
1041         }
1042
1043         /* if there's a single bit error : we can correct it */
1044         if (ecc_status & ATMEL_ECC_ECCERR) {
1045                 /* there's nothing much to do here.
1046                  * the bit error is on the ECC itself.
1047                  */
1048                 printk(KERN_WARNING "atmel_nand : one bit error on ECC code."
1049                                 " Nothing to correct\n");
1050                 return 0;
1051         }
1052
1053         printk(KERN_WARNING "atmel_nand : one bit error on data."
1054                         " (word offset in the page :"
1055                         " 0x%x bit offset : 0x%x)\n",
1056                         ecc_word, ecc_bit);
1057         /* correct the error */
1058         if (nand_chip->options & NAND_BUSWIDTH_16) {
1059                 /* 16 bits words */
1060                 ((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit);
1061         } else {
1062                 /* 8 bits words */
1063                 dat[ecc_word] ^= (1 << ecc_bit);
1064         }
1065         printk(KERN_WARNING "atmel_nand : error corrected\n");
1066         return 1;
1067 }
1068
1069 /*
1070  * Enable HW ECC : unused on most chips
1071  */
1072 static void atmel_nand_hwctl(struct mtd_info *mtd, int mode)
1073 {
1074 }
1075
1076 int atmel_hwecc_nand_init_param(struct nand_chip *nand, struct mtd_info *mtd)
1077 {
1078         nand->ecc.mode = NAND_ECC_HW;
1079         nand->ecc.calculate = atmel_nand_calculate;
1080         nand->ecc.correct = atmel_nand_correct;
1081         nand->ecc.hwctl = atmel_nand_hwctl;
1082         nand->ecc.read_page = atmel_nand_read_page;
1083         nand->ecc.bytes = 4;
1084
1085         if (nand->ecc.mode == NAND_ECC_HW) {
1086                 /* ECC is calculated for the whole page (1 step) */
1087                 nand->ecc.size = mtd->writesize;
1088
1089                 /* set ECC page size and oob layout */
1090                 switch (mtd->writesize) {
1091                 case 512:
1092                         nand->ecc.layout = &atmel_oobinfo_small;
1093                         ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
1094                                         ATMEL_ECC_PAGESIZE_528);
1095                         break;
1096                 case 1024:
1097                         nand->ecc.layout = &atmel_oobinfo_large;
1098                         ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
1099                                         ATMEL_ECC_PAGESIZE_1056);
1100                         break;
1101                 case 2048:
1102                         nand->ecc.layout = &atmel_oobinfo_large;
1103                         ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
1104                                         ATMEL_ECC_PAGESIZE_2112);
1105                         break;
1106                 case 4096:
1107                         nand->ecc.layout = &atmel_oobinfo_large;
1108                         ecc_writel(CONFIG_SYS_NAND_ECC_BASE, MR,
1109                                         ATMEL_ECC_PAGESIZE_4224);
1110                         break;
1111                 default:
1112                         /* page size not handled by HW ECC */
1113                         /* switching back to soft ECC */
1114                         nand->ecc.mode = NAND_ECC_SOFT;
1115                         nand->ecc.calculate = NULL;
1116                         nand->ecc.correct = NULL;
1117                         nand->ecc.hwctl = NULL;
1118                         nand->ecc.read_page = NULL;
1119                         nand->ecc.postpad = 0;
1120                         nand->ecc.prepad = 0;
1121                         nand->ecc.bytes = 0;
1122                         break;
1123                 }
1124         }
1125
1126         return 0;
1127 }
1128
1129 #endif /* CONFIG_ATMEL_NAND_HW_PMECC */
1130
1131 #endif /* CONFIG_ATMEL_NAND_HWECC */
1132
1133 static void at91_nand_hwcontrol(struct mtd_info *mtd,
1134                                          int cmd, unsigned int ctrl)
1135 {
1136         struct nand_chip *this = mtd->priv;
1137
1138         if (ctrl & NAND_CTRL_CHANGE) {
1139                 ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
1140                 IO_ADDR_W &= ~(CONFIG_SYS_NAND_MASK_ALE
1141                              | CONFIG_SYS_NAND_MASK_CLE);
1142
1143                 if (ctrl & NAND_CLE)
1144                         IO_ADDR_W |= CONFIG_SYS_NAND_MASK_CLE;
1145                 if (ctrl & NAND_ALE)
1146                         IO_ADDR_W |= CONFIG_SYS_NAND_MASK_ALE;
1147
1148 #ifdef CONFIG_SYS_NAND_ENABLE_PIN
1149                 at91_set_gpio_value(CONFIG_SYS_NAND_ENABLE_PIN,
1150                                     !(ctrl & NAND_NCE));
1151 #endif
1152                 this->IO_ADDR_W = (void *) IO_ADDR_W;
1153         }
1154
1155         if (cmd != NAND_CMD_NONE)
1156                 writeb(cmd, this->IO_ADDR_W);
1157 }
1158
1159 #ifdef CONFIG_SYS_NAND_READY_PIN
1160 static int at91_nand_ready(struct mtd_info *mtd)
1161 {
1162         return at91_get_gpio_value(CONFIG_SYS_NAND_READY_PIN);
1163 }
1164 #endif
1165
1166 #ifndef CONFIG_SYS_NAND_BASE_LIST
1167 #define CONFIG_SYS_NAND_BASE_LIST { CONFIG_SYS_NAND_BASE }
1168 #endif
1169 static struct nand_chip nand_chip[CONFIG_SYS_MAX_NAND_DEVICE];
1170 static ulong base_addr[CONFIG_SYS_MAX_NAND_DEVICE] = CONFIG_SYS_NAND_BASE_LIST;
1171
1172 int atmel_nand_chip_init(int devnum, ulong base_addr)
1173 {
1174         int ret;
1175         struct mtd_info *mtd = &nand_info[devnum];
1176         struct nand_chip *nand = &nand_chip[devnum];
1177
1178         mtd->priv = nand;
1179         nand->IO_ADDR_R = nand->IO_ADDR_W = (void  __iomem *)base_addr;
1180
1181         nand->ecc.mode = NAND_ECC_SOFT;
1182 #ifdef CONFIG_SYS_NAND_DBW_16
1183         nand->options = NAND_BUSWIDTH_16;
1184 #endif
1185         nand->cmd_ctrl = at91_nand_hwcontrol;
1186 #ifdef CONFIG_SYS_NAND_READY_PIN
1187         nand->dev_ready = at91_nand_ready;
1188 #endif
1189         nand->chip_delay = 20;
1190
1191         ret = nand_scan_ident(mtd, CONFIG_SYS_NAND_MAX_CHIPS, NULL);
1192         if (ret)
1193                 return ret;
1194
1195 #ifdef CONFIG_ATMEL_NAND_HWECC
1196 #ifdef CONFIG_ATMEL_NAND_HW_PMECC
1197         ret = atmel_pmecc_nand_init_params(nand, mtd);
1198 #else
1199         ret = atmel_hwecc_nand_init_param(nand, mtd);
1200 #endif
1201         if (ret)
1202                 return ret;
1203 #endif
1204
1205         ret = nand_scan_tail(mtd);
1206         if (!ret)
1207                 nand_register(devnum);
1208
1209         return ret;
1210 }
1211
1212 void board_nand_init(void)
1213 {
1214         int i;
1215         for (i = 0; i < CONFIG_SYS_MAX_NAND_DEVICE; i++)
1216                 if (atmel_nand_chip_init(i, base_addr[i]))
1217                         printk(KERN_ERR "atmel_nand: Fail to initialize #%d chip",
1218                                 i);
1219 }