drivers/mtd/nand/vf610_nfc.c

   1 /*
   2  * Copyright 2009-2014 Freescale Semiconductor, Inc. and others
   3  *
   4  * Description: MPC5125, VF610, MCF54418 and Kinetis K70 Nand driver.
   5  * Ported to U-Boot by Stefan Agner
   6  * Based on RFC driver posted on Kernel Mailing list by Bill Pringlemeir
   7  * Jason ported to M54418TWR and MVFA5.
   8  * Authors: Stefan Agner <stefan.agner@toradex.com>
   9  *          Bill Pringlemeir <bpringlemeir@nbsps.com>
  10  *          Shaohui Xie <b21989@freescale.com>
  11  *          Jason Jin <Jason.jin@freescale.com>
  12  *
  13  * Based on original driver mpc5121_nfc.c.
  14  *
  15  * This is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * Limitations:
  21  * - Untested on MPC5125 and M54418.
  22  * - DMA not used.
  23  * - 2K pages or less.
  24  * - Only 2K page w. 64+OOB and hardware ECC.
  25  */
  26
  27 #include <common.h>
  28 #include <malloc.h>
  29
  30 #include <linux/mtd/mtd.h>
  31 #include <linux/mtd/nand.h>
  32 #include <linux/mtd/partitions.h>
  33
  34 #include <nand.h>
  35 #include <errno.h>
  36 #include <asm/io.h>
  37
  38 /* Register Offsets */
  39 #define NFC_FLASH_CMD1                  0x3F00
  40 #define NFC_FLASH_CMD2                  0x3F04
  41 #define NFC_COL_ADDR                    0x3F08
  42 #define NFC_ROW_ADDR                    0x3F0c
  43 #define NFC_ROW_ADDR_INC                0x3F14
  44 #define NFC_FLASH_STATUS1               0x3F18
  45 #define NFC_FLASH_STATUS2               0x3F1c
  46 #define NFC_CACHE_SWAP                  0x3F28
  47 #define NFC_SECTOR_SIZE                 0x3F2c
  48 #define NFC_FLASH_CONFIG                0x3F30
  49 #define NFC_IRQ_STATUS                  0x3F38
  50
  51 /* Addresses for NFC MAIN RAM BUFFER areas */
  52 #define NFC_MAIN_AREA(n)                ((n) *  0x1000)
  53
  54 #define PAGE_2K                         0x0800
  55 #define OOB_64                          0x0040
  56
  57 /*
  58  * NFC_CMD2[CODE] values. See section:
  59  *  - 31.4.7 Flash Command Code Description, Vybrid manual
  60  *  - 23.8.6 Flash Command Sequencer, MPC5125 manual
  61  *
  62  * Briefly these are bitmasks of controller cycles.
  63  */
  64 #define READ_PAGE_CMD_CODE              0x7EE0
  65 #define PROGRAM_PAGE_CMD_CODE           0x7FC0
  66 #define ERASE_CMD_CODE                  0x4EC0
  67 #define READ_ID_CMD_CODE                0x4804
  68 #define RESET_CMD_CODE                  0x4040
  69 #define STATUS_READ_CMD_CODE            0x4068
  70
  71 /* NFC ECC mode define */
  72 #define ECC_BYPASS                      0
  73 #define ECC_45_BYTE                     6
  74
  75 /*** Register Mask and bit definitions */
  76
  77 /* NFC_FLASH_CMD1 Field */
  78 #define CMD_BYTE2_MASK                          0xFF000000
  79 #define CMD_BYTE2_SHIFT                         24
  80
  81 /* NFC_FLASH_CM2 Field */
  82 #define CMD_BYTE1_MASK                          0xFF000000
  83 #define CMD_BYTE1_SHIFT                         24
  84 #define CMD_CODE_MASK                           0x00FFFF00
  85 #define CMD_CODE_SHIFT                          8
  86 #define BUFNO_MASK                              0x00000006
  87 #define BUFNO_SHIFT                             1
  88 #define START_BIT                               (1<<0)
  89
  90 /* NFC_COL_ADDR Field */
  91 #define COL_ADDR_MASK                           0x0000FFFF
  92 #define COL_ADDR_SHIFT                          0
  93
  94 /* NFC_ROW_ADDR Field */
  95 #define ROW_ADDR_MASK                           0x00FFFFFF
  96 #define ROW_ADDR_SHIFT                          0
  97 #define ROW_ADDR_CHIP_SEL_RB_MASK               0xF0000000
  98 #define ROW_ADDR_CHIP_SEL_RB_SHIFT              28
  99 #define ROW_ADDR_CHIP_SEL_MASK                  0x0F000000
 100 #define ROW_ADDR_CHIP_SEL_SHIFT                 24
 101
 102 /* NFC_FLASH_STATUS2 Field */
 103 #define STATUS_BYTE1_MASK                       0x000000FF
 104
 105 /* NFC_FLASH_CONFIG Field */
 106 #define CONFIG_ECC_SRAM_ADDR_MASK               0x7FC00000
 107 #define CONFIG_ECC_SRAM_ADDR_SHIFT              22
 108 #define CONFIG_ECC_SRAM_REQ_BIT                 (1<<21)
 109 #define CONFIG_DMA_REQ_BIT                      (1<<20)
 110 #define CONFIG_ECC_MODE_MASK                    0x000E0000
 111 #define CONFIG_ECC_MODE_SHIFT                   17
 112 #define CONFIG_FAST_FLASH_BIT                   (1<<16)
 113 #define CONFIG_16BIT                            (1<<7)
 114 #define CONFIG_BOOT_MODE_BIT                    (1<<6)
 115 #define CONFIG_ADDR_AUTO_INCR_BIT               (1<<5)
 116 #define CONFIG_BUFNO_AUTO_INCR_BIT              (1<<4)
 117 #define CONFIG_PAGE_CNT_MASK                    0xF
 118 #define CONFIG_PAGE_CNT_SHIFT                   0
 119
 120 /* NFC_IRQ_STATUS Field */
 121 #define IDLE_IRQ_BIT                            (1<<29)
 122 #define IDLE_EN_BIT                             (1<<20)
 123 #define CMD_DONE_CLEAR_BIT                      (1<<18)
 124 #define IDLE_CLEAR_BIT                          (1<<17)
 125
 126 #define NFC_TIMEOUT     (1000)
 127
 128 /* ECC status placed at end of buffers. */
 129 #define ECC_SRAM_ADDR   ((PAGE_2K+256-8) >> 3)
 130 #define ECC_STATUS_MASK 0x80
 131 #define ECC_ERR_COUNT   0x3F
 132
 133 /*
 134  * ECC status is stored at NFC_CFG[ECCADD] +4 for little-endian
 135  * and +7 for big-endian SOC.
 136  */
 137 #ifdef CONFIG_VF610
 138 #define ECC_OFFSET      4
 139 #else
 140 #define ECC_OFFSET      7
 141 #endif
 142
 143 struct vf610_nfc {
 144         struct mtd_info   *mtd;
 145         struct nand_chip   chip;
 146         void __iomem      *regs;
 147         uint               column;
 148         int                spareonly;
 149         int                page;
 150         /* Status and ID are in alternate locations. */
 151         int                alt_buf;
 152 #define ALT_BUF_ID   1
 153 #define ALT_BUF_STAT 2
 154         struct clk        *clk;
 155 };
 156
 157 #define mtd_to_nfc(_mtd) \
 158         (struct vf610_nfc *)((struct nand_chip *)_mtd->priv)->priv
 159
 160 static u8 bbt_pattern[] = {'B', 'b', 't', '0' };
 161 static u8 mirror_pattern[] = {'1', 't', 'b', 'B' };
 162
 163 static struct nand_bbt_descr bbt_main_descr = {
 164         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 165                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 166         .offs = 11,
 167         .len = 4,
 168         .veroffs = 15,
 169         .maxblocks = 4,
 170         .pattern = bbt_pattern,
 171 };
 172
 173 static struct nand_bbt_descr bbt_mirror_descr = {
 174         .options = NAND_BBT_LASTBLOCK | NAND_BBT_CREATE | NAND_BBT_WRITE |
 175                    NAND_BBT_2BIT | NAND_BBT_VERSION,
 176         .offs = 11,
 177         .len = 4,
 178         .veroffs = 15,
 179         .maxblocks = 4,
 180         .pattern = mirror_pattern,
 181 };
 182
 183 static struct nand_ecclayout vf610_nfc_ecc45 = {
 184         .eccbytes = 45,
 185         .eccpos = {19, 20, 21, 22, 23,
 186                    24, 25, 26, 27, 28, 29, 30, 31,
 187                    32, 33, 34, 35, 36, 37, 38, 39,
 188                    40, 41, 42, 43, 44, 45, 46, 47,
 189                    48, 49, 50, 51, 52, 53, 54, 55,
 190                    56, 57, 58, 59, 60, 61, 62, 63},
 191         .oobfree = {
 192                 {.offset = 8,
 193                  .length = 11} }
 194 };
 195
 196 static inline u32 vf610_nfc_read(struct mtd_info *mtd, uint reg)
 197 {
 198         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 199
 200         return readl(nfc->regs + reg);
 201 }
 202
 203 static inline void vf610_nfc_write(struct mtd_info *mtd, uint reg, u32 val)
 204 {
 205         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 206
 207         writel(val, nfc->regs + reg);
 208 }
 209
 210 static inline void vf610_nfc_set(struct mtd_info *mtd, uint reg, u32 bits)
 211 {
 212         vf610_nfc_write(mtd, reg, vf610_nfc_read(mtd, reg) | bits);
 213 }
 214
 215 static inline void vf610_nfc_clear(struct mtd_info *mtd, uint reg, u32 bits)
 216 {
 217         vf610_nfc_write(mtd, reg, vf610_nfc_read(mtd, reg) & ~bits);
 218 }
 219
 220 static inline void vf610_nfc_set_field(struct mtd_info *mtd, u32 reg,
 221                                        u32 mask, u32 shift, u32 val)
 222 {
 223         vf610_nfc_write(mtd, reg,
 224                         (vf610_nfc_read(mtd, reg) & (~mask)) | val << shift);
 225 }
 226
 227 static inline void vf610_nfc_memcpy(void *dst, const void *src, size_t n)
 228 {
 229         /*
 230          * Use this accessor for the interal SRAM buffers. On ARM we can
 231          * treat the SRAM buffer as if its memory, hence use memcpy
 232          */
 233         memcpy(dst, src, n);
 234 }
 235
 236 /* Clear flags for upcoming command */
 237 static inline void vf610_nfc_clear_status(void __iomem *regbase)
 238 {
 239         void __iomem *reg = regbase + NFC_IRQ_STATUS;
 240         u32 tmp = __raw_readl(reg);
 241         tmp |= CMD_DONE_CLEAR_BIT | IDLE_CLEAR_BIT;
 242         __raw_writel(tmp, reg);
 243 }
 244
 245 /* Wait for complete operation */
 246 static inline void vf610_nfc_done(struct mtd_info *mtd)
 247 {
 248         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 249         uint start;
 250
 251         /*
 252          * Barrier is needed after this write. This write need
 253          * to be done before reading the next register the first
 254          * time.
 255          * vf610_nfc_set implicates such a barrier by using writel
 256          * to write to the register.
 257          */
 258         vf610_nfc_set(mtd, NFC_FLASH_CMD2, START_BIT);
 259
 260         start = get_timer(0);
 261
 262         while (!(vf610_nfc_read(mtd, NFC_IRQ_STATUS) & IDLE_IRQ_BIT)) {
 263                 if (get_timer(start) > NFC_TIMEOUT) {
 264                         printf("Timeout while waiting for !BUSY.\n");
 265                         return;
 266                 }
 267         }
 268         vf610_nfc_clear_status(nfc->regs);
 269 }
 270
 271 static u8 vf610_nfc_get_id(struct mtd_info *mtd, int col)
 272 {
 273         u32 flash_id;
 274
 275         if (col < 4) {
 276                 flash_id = vf610_nfc_read(mtd, NFC_FLASH_STATUS1);
 277                 return (flash_id >> (3-col)*8) & 0xff;
 278         } else {
 279                 flash_id = vf610_nfc_read(mtd, NFC_FLASH_STATUS2);
 280                 return flash_id >> 24;
 281         }
 282 }
 283
 284 static u8 vf610_nfc_get_status(struct mtd_info *mtd)
 285 {
 286         return vf610_nfc_read(mtd, NFC_FLASH_STATUS2) & STATUS_BYTE1_MASK;
 287 }
 288
 289 /* Single command */
 290 static void vf610_nfc_send_command(void __iomem *regbase, u32 cmd_byte1,
 291                                    u32 cmd_code)
 292 {
 293         void __iomem *reg = regbase + NFC_FLASH_CMD2;
 294         u32 tmp;
 295         vf610_nfc_clear_status(regbase);
 296
 297         tmp = __raw_readl(reg);
 298         tmp &= ~(CMD_BYTE1_MASK | CMD_CODE_MASK | BUFNO_MASK);
 299         tmp |= cmd_byte1 << CMD_BYTE1_SHIFT;
 300         tmp |= cmd_code << CMD_CODE_SHIFT;
 301         __raw_writel(tmp, reg);
 302 }
 303
 304 /* Two commands */
 305 static void vf610_nfc_send_commands(void __iomem *regbase, u32 cmd_byte1,
 306                               u32 cmd_byte2, u32 cmd_code)
 307 {
 308         void __iomem *reg = regbase + NFC_FLASH_CMD1;
 309         u32 tmp;
 310         vf610_nfc_send_command(regbase, cmd_byte1, cmd_code);
 311
 312         tmp = __raw_readl(reg);
 313         tmp &= ~CMD_BYTE2_MASK;
 314         tmp |= cmd_byte2 << CMD_BYTE2_SHIFT;
 315         __raw_writel(tmp, reg);
 316 }
 317
 318 static void vf610_nfc_addr_cycle(struct mtd_info *mtd, int column, int page)
 319 {
 320         if (column != -1) {
 321                 struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 322                 if (nfc->chip.options | NAND_BUSWIDTH_16)
 323                         column = column/2;
 324                 vf610_nfc_set_field(mtd, NFC_COL_ADDR, COL_ADDR_MASK,
 325                                     COL_ADDR_SHIFT, column);
 326         }
 327         if (page != -1)
 328                 vf610_nfc_set_field(mtd, NFC_ROW_ADDR, ROW_ADDR_MASK,
 329                                     ROW_ADDR_SHIFT, page);
 330 }
 331
 332 /* Send command to NAND chip */
 333 static void vf610_nfc_command(struct mtd_info *mtd, unsigned command,
 334                               int column, int page)
 335 {
 336         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 337
 338         nfc->column     = max(column, 0);
 339         nfc->spareonly  = 0;
 340         nfc->alt_buf    = 0;
 341
 342         switch (command) {
 343         case NAND_CMD_PAGEPROG:
 344                 nfc->page = -1;
 345                 vf610_nfc_send_commands(nfc->regs, NAND_CMD_SEQIN,
 346                                         command, PROGRAM_PAGE_CMD_CODE);
 347                 vf610_nfc_addr_cycle(mtd, column, page);
 348                 break;
 349
 350         case NAND_CMD_RESET:
 351                 vf610_nfc_send_command(nfc->regs, command, RESET_CMD_CODE);
 352                 break;
 353         /*
 354          * NFC does not support sub-page reads and writes,
 355          * so emulate them using full page transfers.
 356          */
 357         case NAND_CMD_READOOB:
 358                 nfc->spareonly = 1;
 359         case NAND_CMD_SEQIN: /* Pre-read for partial writes. */
 360         case NAND_CMD_READ0:
 361                 column = 0;
 362                 /* Already read? */
 363                 if (nfc->page == page)
 364                         return;
 365                 nfc->page = page;
 366                 vf610_nfc_send_commands(nfc->regs, NAND_CMD_READ0,
 367                                         NAND_CMD_READSTART, READ_PAGE_CMD_CODE);
 368                 vf610_nfc_addr_cycle(mtd, column, page);
 369                 break;
 370
 371         case NAND_CMD_ERASE1:
 372                 if (nfc->page == page)
 373                         nfc->page = -1;
 374                 vf610_nfc_send_commands(nfc->regs, command,
 375                                         NAND_CMD_ERASE2, ERASE_CMD_CODE);
 376                 vf610_nfc_addr_cycle(mtd, column, page);
 377                 break;
 378
 379         case NAND_CMD_READID:
 380                 nfc->alt_buf = ALT_BUF_ID;
 381                 vf610_nfc_send_command(nfc->regs, command, READ_ID_CMD_CODE);
 382                 break;
 383
 384         case NAND_CMD_STATUS:
 385                 nfc->alt_buf = ALT_BUF_STAT;
 386                 vf610_nfc_send_command(nfc->regs, command,
 387                                        STATUS_READ_CMD_CODE);
 388                 break;
 389         default:
 390                 return;
 391         }
 392
 393         vf610_nfc_done(mtd);
 394 }
 395
 396 static inline void vf610_nfc_read_spare(struct mtd_info *mtd, void *buf,
 397                                         int len)
 398 {
 399         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 400
 401         len = min(mtd->oobsize, (uint)len);
 402         if (len > 0)
 403                 vf610_nfc_memcpy(buf, nfc->regs + mtd->writesize, len);
 404 }
 405
 406 /* Read data from NFC buffers */
 407 static void vf610_nfc_read_buf(struct mtd_info *mtd, u_char *buf, int len)
 408 {
 409         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 410         uint c = nfc->column;
 411         uint l;
 412
 413         /* Handle main area */
 414         if (!nfc->spareonly) {
 415                 l = min((uint)len, mtd->writesize - c);
 416                 nfc->column += l;
 417
 418                 if (!nfc->alt_buf)
 419                         vf610_nfc_memcpy(buf, nfc->regs + NFC_MAIN_AREA(0) + c,
 420                                          l);
 421                 else
 422                         if (nfc->alt_buf & ALT_BUF_ID)
 423                                 *buf = vf610_nfc_get_id(mtd, c);
 424                         else
 425                                 *buf = vf610_nfc_get_status(mtd);
 426
 427                 buf += l;
 428                 len -= l;
 429         }
 430
 431         /* Handle spare area access */
 432         if (len) {
 433                 nfc->column += len;
 434                 vf610_nfc_read_spare(mtd, buf, len);
 435         }
 436 }
 437
 438 /* Write data to NFC buffers */
 439 static void vf610_nfc_write_buf(struct mtd_info *mtd, const u_char *buf,
 440                                 int len)
 441 {
 442         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 443         uint c = nfc->column;
 444         uint l;
 445
 446         l = min((uint)len, mtd->writesize + mtd->oobsize - c);
 447         nfc->column += l;
 448         vf610_nfc_memcpy(nfc->regs + NFC_MAIN_AREA(0) + c, buf, l);
 449 }
 450
 451 /* Read byte from NFC buffers */
 452 static u8 vf610_nfc_read_byte(struct mtd_info *mtd)
 453 {
 454         u8 tmp;
 455         vf610_nfc_read_buf(mtd, &tmp, sizeof(tmp));
 456         return tmp;
 457 }
 458
 459 /* Read word from NFC buffers */
 460 static u16 vf610_nfc_read_word(struct mtd_info *mtd)
 461 {
 462         u16 tmp;
 463         vf610_nfc_read_buf(mtd, (u_char *)&tmp, sizeof(tmp));
 464         return tmp;
 465 }
 466
 467 /* If not provided, upper layers apply a fixed delay. */
 468 static int vf610_nfc_dev_ready(struct mtd_info *mtd)
 469 {
 470         /* NFC handles R/B internally; always ready.  */
 471         return 1;
 472 }
 473
 474 /*
 475  * This function supports Vybrid only (MPC5125 would have full RB and four CS)
 476  */
 477 static void vf610_nfc_select_chip(struct mtd_info *mtd, int chip)
 478 {
 479 #ifdef CONFIG_VF610
 480         u32 tmp = vf610_nfc_read(mtd, NFC_ROW_ADDR);
 481         tmp &= ~(ROW_ADDR_CHIP_SEL_RB_MASK | ROW_ADDR_CHIP_SEL_MASK);
 482         tmp |= 1 << ROW_ADDR_CHIP_SEL_RB_SHIFT;
 483
 484         if (chip == 0)
 485                 tmp |= 1 << ROW_ADDR_CHIP_SEL_SHIFT;
 486         else if (chip == 1)
 487                 tmp |= 2 << ROW_ADDR_CHIP_SEL_SHIFT;
 488
 489         vf610_nfc_write(mtd, NFC_ROW_ADDR, tmp);
 490 #endif
 491 }
 492
 493 /* Count the number of 0's in buff upto max_bits */
 494 static inline int count_written_bits(uint8_t *buff, int size, int max_bits)
 495 {
 496         uint32_t *buff32 = (uint32_t *)buff;
 497         int k, written_bits = 0;
 498
 499         for (k = 0; k < (size / 4); k++) {
 500                 written_bits += hweight32(~buff32[k]);
 501                 if (written_bits > max_bits)
 502                         break;
 503         }
 504
 505         return written_bits;
 506 }
 507
 508 static inline int vf610_nfc_correct_data(struct mtd_info *mtd, u_char *dat)
 509 {
 510         struct vf610_nfc *nfc = mtd_to_nfc(mtd);
 511         u8 ecc_status;
 512         u8 ecc_count;
 513         int flip;
 514
 515         ecc_status = __raw_readb(nfc->regs + ECC_SRAM_ADDR * 8 + ECC_OFFSET);
 516         ecc_count = ecc_status & ECC_ERR_COUNT;
 517         if (!(ecc_status & ECC_STATUS_MASK))
 518                 return ecc_count;
 519
 520         /* If 'ecc_count' zero or less then buffer is all 0xff or erased. */
 521         flip = count_written_bits(dat, nfc->chip.ecc.size, ecc_count);
 522
 523         /* ECC failed. */
 524         if (flip > ecc_count) {
 525                 nfc->page = -1;
 526                 return -1;
 527         }
 528
 529         /* Erased page. */
 530         memset(dat, 0xff, nfc->chip.ecc.size);
 531         return 0;
 532 }
 533
 534
 535 static int vf610_nfc_read_page(struct mtd_info *mtd, struct nand_chip *chip,
 536                                 uint8_t *buf, int oob_required, int page)
 537 {
 538         int eccsize = chip->ecc.size;
 539         int stat;
 540         uint8_t *p = buf;
 541
 542
 543         vf610_nfc_read_buf(mtd, p, eccsize);
 544
 545         if (oob_required)
 546                 vf610_nfc_read_buf(mtd, chip->oob_poi, mtd->oobsize);
 547
 548         stat = vf610_nfc_correct_data(mtd, p);
 549
 550         if (stat < 0)
 551                 mtd->ecc_stats.failed++;
 552         else
 553                 mtd->ecc_stats.corrected += stat;
 554
 555         return 0;
 556 }
 557
 558 /*
 559  * ECC will be calculated automatically
 560  */
 561 static int vf610_nfc_write_page(struct mtd_info *mtd, struct nand_chip *chip,
 562                                const uint8_t *buf, int oob_required)
 563 {
 564         vf610_nfc_write_buf(mtd, buf, mtd->writesize);
 565         if (oob_required)
 566                 vf610_nfc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
 567
 568         return 0;
 569 }
 570
 571 struct vf610_nfc_config {
 572         int hardware_ecc;
 573         int width;
 574         int flash_bbt;
 575 };
 576
 577 static int vf610_nfc_nand_init(int devnum, void __iomem *addr)
 578 {
 579         struct mtd_info *mtd = &nand_info[devnum];
 580         struct nand_chip *chip;
 581         struct vf610_nfc *nfc;
 582         int err = 0;
 583         int page_sz;
 584         struct vf610_nfc_config cfg = {
 585                 .hardware_ecc = 1,
 586 #ifdef CONFIG_SYS_NAND_BUSWIDTH_16BIT
 587                 .width = 16,
 588 #else
 589                 .width = 8,
 590 #endif
 591                 .flash_bbt = 1,
 592         };
 593
 594         nfc = malloc(sizeof(*nfc));
 595         if (!nfc) {
 596                 printf(KERN_ERR "%s: Memory exhausted!\n", __func__);
 597                 return -ENOMEM;
 598         }
 599
 600         chip = &nfc->chip;
 601         nfc->regs = addr;
 602
 603         mtd->priv = chip;
 604         chip->priv = nfc;
 605
 606         if (cfg.width == 16) {
 607                 chip->options |= NAND_BUSWIDTH_16;
 608                 vf610_nfc_set(mtd, NFC_FLASH_CONFIG, CONFIG_16BIT);
 609         } else {
 610                 chip->options &= ~NAND_BUSWIDTH_16;
 611                 vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_16BIT);
 612         }
 613
 614         chip->dev_ready = vf610_nfc_dev_ready;
 615         chip->cmdfunc = vf610_nfc_command;
 616         chip->read_byte = vf610_nfc_read_byte;
 617         chip->read_word = vf610_nfc_read_word;
 618         chip->read_buf = vf610_nfc_read_buf;
 619         chip->write_buf = vf610_nfc_write_buf;
 620         chip->select_chip = vf610_nfc_select_chip;
 621
 622         /* Bad block options. */
 623         if (cfg.flash_bbt)
 624                 chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_CREATE;
 625
 626         /* Default to software ECC until flash ID. */
 627         vf610_nfc_set_field(mtd, NFC_FLASH_CONFIG,
 628                             CONFIG_ECC_MODE_MASK,
 629                             CONFIG_ECC_MODE_SHIFT, ECC_BYPASS);
 630
 631         chip->bbt_td = &bbt_main_descr;
 632         chip->bbt_md = &bbt_mirror_descr;
 633
 634         page_sz = PAGE_2K + OOB_64;
 635         page_sz += cfg.width == 16 ? 1 : 0;
 636         vf610_nfc_write(mtd, NFC_SECTOR_SIZE, page_sz);
 637
 638         /* Set configuration register. */
 639         vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_ADDR_AUTO_INCR_BIT);
 640         vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_BUFNO_AUTO_INCR_BIT);
 641         vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_BOOT_MODE_BIT);
 642         vf610_nfc_clear(mtd, NFC_FLASH_CONFIG, CONFIG_DMA_REQ_BIT);
 643         vf610_nfc_set(mtd, NFC_FLASH_CONFIG, CONFIG_FAST_FLASH_BIT);
 644
 645         /* Enable Idle IRQ */
 646         vf610_nfc_set(mtd, NFC_IRQ_STATUS, IDLE_EN_BIT);
 647
 648         /* PAGE_CNT = 1 */
 649         vf610_nfc_set_field(mtd, NFC_FLASH_CONFIG, CONFIG_PAGE_CNT_MASK,
 650                             CONFIG_PAGE_CNT_SHIFT, 1);
 651
 652         /* Set ECC_STATUS offset */
 653         vf610_nfc_set_field(mtd, NFC_FLASH_CONFIG,
 654                             CONFIG_ECC_SRAM_ADDR_MASK,
 655                             CONFIG_ECC_SRAM_ADDR_SHIFT, ECC_SRAM_ADDR);
 656
 657         /* first scan to find the device and get the page size */
 658         if (nand_scan_ident(mtd, CONFIG_SYS_MAX_NAND_DEVICE, NULL)) {
 659                 err = -ENXIO;
 660                 goto error;
 661         }
 662
 663         chip->ecc.mode = NAND_ECC_SOFT; /* default */
 664
 665         page_sz = mtd->writesize + mtd->oobsize;
 666
 667         /* Single buffer only, max 256 OOB minus ECC status */
 668         if (page_sz > PAGE_2K + 256 - 8) {
 669                 dev_err(nfc->dev, "Unsupported flash size\n");
 670                 err = -ENXIO;
 671                 goto error;
 672         }
 673         page_sz += cfg.width == 16 ? 1 : 0;
 674         vf610_nfc_write(mtd, NFC_SECTOR_SIZE, page_sz);
 675
 676         if (cfg.hardware_ecc) {
 677                 if (mtd->writesize != PAGE_2K && mtd->oobsize < 64) {
 678                         dev_err(nfc->dev, "Unsupported flash with hwecc\n");
 679                         err = -ENXIO;
 680                         goto error;
 681                 }
 682
 683                 chip->ecc.layout = &vf610_nfc_ecc45;
 684
 685                 /* propagate ecc.layout to mtd_info */
 686                 mtd->ecclayout = chip->ecc.layout;
 687                 chip->ecc.read_page = vf610_nfc_read_page;
 688                 chip->ecc.write_page = vf610_nfc_write_page;
 689                 chip->ecc.mode = NAND_ECC_HW;
 690
 691                 chip->ecc.bytes = 45;
 692                 chip->ecc.size = PAGE_2K;
 693                 chip->ecc.strength = 24;
 694
 695                 /* set ECC mode to 45 bytes OOB with 24 bits correction */
 696                 vf610_nfc_set_field(mtd, NFC_FLASH_CONFIG,
 697                                     CONFIG_ECC_MODE_MASK,
 698                                     CONFIG_ECC_MODE_SHIFT, ECC_45_BYTE);
 699
 700                 /* Enable ECC_STATUS */
 701                 vf610_nfc_set(mtd, NFC_FLASH_CONFIG, CONFIG_ECC_SRAM_REQ_BIT);
 702         }
 703
 704         /* second phase scan */
 705         err = nand_scan_tail(mtd);
 706         if (err)
 707                 return err;
 708
 709         err = nand_register(devnum);
 710         if (err)
 711                 return err;
 712
 713         return 0;
 714
 715 error:
 716         return err;
 717 }
 718
 719 void board_nand_init(void)
 720 {
 721         int err = vf610_nfc_nand_init(0, (void __iomem *)CONFIG_SYS_NAND_BASE);
 722         if (err)
 723                 printf("VF610 NAND init failed (err %d)\n", err);
 724 }