diff options
Diffstat (limited to 'drivers/mtd/nand/nand_bch.c')
| -rw-r--r-- | drivers/mtd/nand/nand_bch.c | 27 |
1 files changed, 17 insertions, 10 deletions
diff --git a/drivers/mtd/nand/nand_bch.c b/drivers/mtd/nand/nand_bch.c index a87c1b628..b585bae37 100644 --- a/drivers/mtd/nand/nand_bch.c +++ b/drivers/mtd/nand/nand_bch.c @@ -107,9 +107,6 @@ EXPORT_SYMBOL(nand_bch_correct_data); /** * nand_bch_init - [NAND Interface] Initialize NAND BCH error correction * @mtd: MTD block structure - * @eccsize: ecc block size in bytes - * @eccbytes: ecc length in bytes - * @ecclayout: output default layout * * Returns: * a pointer to a new NAND BCH control structure, or NULL upon failure @@ -123,14 +120,21 @@ EXPORT_SYMBOL(nand_bch_correct_data); * @eccsize = 512 (thus, m=13 is the smallest integer such that 2^m-1 > 512*8) * @eccbytes = 7 (7 bytes are required to store m*t = 13*4 = 52 bits) */ -struct nand_bch_control * -nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes, - struct nand_ecclayout **ecclayout) +struct nand_bch_control *nand_bch_init(struct mtd_info *mtd) { + struct nand_chip *nand = mtd_to_nand(mtd); unsigned int m, t, eccsteps, i; - struct nand_ecclayout *layout; + struct nand_ecclayout *layout = nand->ecc.layout; struct nand_bch_control *nbc = NULL; unsigned char *erased_page; + unsigned int eccsize = nand->ecc.size; + unsigned int eccbytes = nand->ecc.bytes; + unsigned int eccstrength = nand->ecc.strength; + + if (!eccbytes && eccstrength) { + eccbytes = DIV_ROUND_UP(eccstrength * fls(8 * eccsize), 8); + nand->ecc.bytes = eccbytes; + } if (!eccsize || !eccbytes) { printk(KERN_WARNING "ecc parameters not supplied\n"); @@ -158,7 +162,7 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes, eccsteps = mtd->writesize/eccsize; /* if no ecc placement scheme was provided, build one */ - if (!*ecclayout) { + if (!layout) { /* handle large page devices only */ if (mtd->oobsize < 64) { @@ -184,7 +188,7 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes, layout->oobfree[0].offset = 2; layout->oobfree[0].length = mtd->oobsize-2-layout->eccbytes; - *ecclayout = layout; + nand->ecc.layout = layout; } /* sanity checks */ @@ -192,7 +196,7 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes, printk(KERN_WARNING "eccsize %u is too large\n", eccsize); goto fail; } - if ((*ecclayout)->eccbytes != (eccsteps*eccbytes)) { + if (layout->eccbytes != (eccsteps*eccbytes)) { printk(KERN_WARNING "invalid ecc layout\n"); goto fail; } @@ -216,6 +220,9 @@ nand_bch_init(struct mtd_info *mtd, unsigned int eccsize, unsigned int eccbytes, for (i = 0; i < eccbytes; i++) nbc->eccmask[i] ^= 0xff; + if (!eccstrength) + nand->ecc.strength = (eccbytes * 8) / fls(8 * eccsize); + return nbc; fail: nand_bch_free(nbc); |