diff options
Diffstat (limited to 'drivers/mtd/nand/nand_bbt.c')
| -rw-r--r-- | drivers/mtd/nand/nand_bbt.c | 59 |
1 files changed, 30 insertions, 29 deletions
diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c index 5ff6eba8bec6..c85c69dec540 100644 --- a/drivers/mtd/nand/nand_bbt.c +++ b/drivers/mtd/nand/nand_bbt.c @@ -6,7 +6,7 @@ * * Copyright (C) 2004 Thomas Gleixner (tglx@linutronix.de) * - * $Id: nand_bbt.c,v 1.30 2005/02/11 10:14:12 dedekind Exp $ + * $Id: nand_bbt.c,v 1.31 2005/02/16 17:09:36 dedekind Exp $ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as @@ -77,17 +77,17 @@ */ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_descr *td) { - int i, end; + int i, end = 0; uint8_t *p = buf; - end = paglen + td->offs; if (td->options & NAND_BBT_SCANEMPTY) { + end = paglen + td->offs; for (i = 0; i < end; i++) { if (p[i] != 0xff) return -1; } + p += end; } - p += end; /* Compare the pattern */ for (i = 0; i < td->len; i++) { @@ -95,9 +95,9 @@ static int check_pattern (uint8_t *buf, int len, int paglen, struct nand_bbt_des return -1; } - p += td->len; - end += td->len; if (td->options & NAND_BBT_SCANEMPTY) { + p += td->len; + end += td->len; for (i = end; i < len; i++) { if (*p++ != 0xff) return -1; @@ -255,7 +255,7 @@ static int read_abs_bbts (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_de static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr *bd, int chip) { struct nand_chip *this = mtd->priv; - int i, j, numblocks, len, scanlen, pagelen; + int i, j, numblocks, len, scanlen; int startblock; loff_t from; size_t readlen, ooblen; @@ -270,17 +270,16 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr else len = 1; } - - if (bd->options == 0) { - /* Memory-based BBT. We may read only needed bytes from the OOB area to - * test if block is bad, no need to read the whole page content. */ - scanlen = ooblen = pagelen = 0; + + if (!(bd->options & NAND_BBT_SCANEMPTY)) { + /* We need only read few bytes from the OOB area */ + scanlen = ooblen = 0; readlen = bd->len; } else { + /* Full page content should be read */ scanlen = mtd->oobblock + mtd->oobsize; readlen = len * mtd->oobblock; ooblen = len * mtd->oobsize; - pagelen = mtd->oobblock; } if (chip == -1) { @@ -293,7 +292,7 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr if (chip >= this->numchips) { printk (KERN_WARNING "create_bbt(): chipnr (%d) > available chips (%d)\n", chip + 1, this->numchips); - return -EINVAL; + return -EINVAL; } numblocks = this->chipsize >> (this->bbt_erase_shift - 1); startblock = chip * numblocks; @@ -304,16 +303,21 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr for (i = startblock; i < numblocks;) { int ret; - if (bd->options == 0) { - size_t retlen; - if ((ret = mtd->read_oob(mtd, from + bd->offs, bd->len, &retlen, &buf[bd->offs]))) - return ret; - } else { + if (bd->options & NAND_BBT_SCANEMPTY) if ((ret = nand_read_raw (mtd, buf, from, readlen, ooblen))) return ret; - } + for (j = 0; j < len; j++) { - if (check_pattern (&buf[j * scanlen], scanlen, pagelen, bd)) { + if (!(bd->options & NAND_BBT_SCANEMPTY)) { + size_t retlen; + + /* No need to read pages fully, just read required OOB bytes */ + ret = mtd->read_oob(mtd, from + j * mtd->oobblock + bd->offs, + readlen, &retlen, &buf[0]); + if (ret) + return ret; + } + if (check_pattern (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) { this->bbt[i >> 3] |= 0x03 << (i & 0x6); printk (KERN_WARNING "Bad eraseblock %d at 0x%08x\n", i >> 1, (unsigned int) from); @@ -323,6 +327,7 @@ static int create_bbt (struct mtd_info *mtd, uint8_t *buf, struct nand_bbt_descr i += 2; from += (1 << this->bbt_erase_shift); } + return 0; } @@ -608,12 +613,11 @@ write: * The function creates a memory based bbt by scanning the device * for manufacturer / software marked good / bad blocks */ -static int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) +static inline int nand_memory_bbt (struct mtd_info *mtd, struct nand_bbt_descr *bd) { struct nand_chip *this = mtd->priv; - /* Ensure that we only scan for the pattern and nothing else */ - bd->options = 0; + bd->options &= ~NAND_BBT_SCANEMPTY; return create_bbt (mtd, this->data_buf, bd, -1); } @@ -928,14 +932,11 @@ out: } /* Define some generic bad / good block scan pattern which are used - * while scanning a device for factory marked good / bad blocks - * - * The memory based patterns just - */ + * while scanning a device for factory marked good / bad blocks. */ static uint8_t scan_ff_pattern[] = { 0xff, 0xff }; static struct nand_bbt_descr smallpage_memorybased = { - .options = 0, + .options = NAND_BBT_SCAN2NDPAGE, .offs = 5, .len = 1, .pattern = scan_ff_pattern |