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mtd: nand: simplify nand_bch_init() usage 

nand_bch_init() requires several arguments which could directly be deduced
from the mtd device. Get rid of those useless parameters.

nand_bch_init() is also requiring the caller to provide a proper eccbytes
value, while this value could be deduced from the ecc.size and
ecc.strength value. Fallback to eccbytes calculation when it is set to 0.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Boris BREZILLON 2016-03-07 10:46:54 +01:00 committed by Brian Norris
parent f2de0fa643
commit a8c65d504e
4 changed files with 33 additions and 36 deletions
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6
drivers/mtd/nand/nand_base.c
View File

@ -4279,10 +4279,8 @@ int nand_scan_tail(struct mtd_info *mtd)
}
/* See nand_bch_init() for details. */
ecc->bytes = DIV_ROUND_UP(
ecc->strength * fls(8 * ecc->size), 8);
ecc->priv = nand_bch_init(mtd, ecc->size, ecc->bytes,
&ecc->layout);
ecc->bytes = 0;
ecc->priv = nand_bch_init(mtd);
if (!ecc->priv) {
pr_warn("BCH ECC initialization failed!\n");
BUG();

27
drivers/mtd/nand/nand_bch.c
View File

@ -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);

28
drivers/mtd/nand/omap2.c
View File

@ -1807,13 +1807,19 @@ static int omap_nand_probe(struct platform_device *pdev)
goto return_error;
}
/*
* Bail out earlier to let NAND_ECC_SOFT code create its own
* ecclayout instead of using ours.
*/
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW) {
nand_chip->ecc.mode = NAND_ECC_SOFT;
goto scan_tail;
}
/* populate MTD interface based on ECC scheme */
ecclayout = &info->oobinfo;
nand_chip->ecc.layout = ecclayout;
switch (info->ecc_opt) {
case OMAP_ECC_HAM1_CODE_SW:
nand_chip->ecc.mode = NAND_ECC_SOFT;
break;
case OMAP_ECC_HAM1_CODE_HW:
pr_info("nand: using OMAP_ECC_HAM1_CODE_HW\n");
nand_chip->ecc.mode = NAND_ECC_HW;
@ -1861,10 +1867,7 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->oobfree->offset = 1 +
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
/* software bch library is used for locating errors */
nand_chip->ecc.priv = nand_bch_init(mtd,
nand_chip->ecc.size,
nand_chip->ecc.bytes,
&ecclayout);
nand_chip->ecc.priv = nand_bch_init(mtd);
if (!nand_chip->ecc.priv) {
dev_err(&info->pdev->dev, "unable to use BCH library\n");
err = -EINVAL;
@ -1925,10 +1928,7 @@ static int omap_nand_probe(struct platform_device *pdev)
ecclayout->oobfree->offset = 1 +
ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
/* software bch library is used for locating errors */
nand_chip->ecc.priv = nand_bch_init(mtd,
nand_chip->ecc.size,
nand_chip->ecc.bytes,
&ecclayout);
nand_chip->ecc.priv = nand_bch_init(mtd);
if (!nand_chip->ecc.priv) {
dev_err(&info->pdev->dev, "unable to use BCH library\n");
err = -EINVAL;
@ -2002,9 +2002,6 @@ static int omap_nand_probe(struct platform_device *pdev)
goto return_error;
}
if (info->ecc_opt == OMAP_ECC_HAM1_CODE_SW)
goto scan_tail;
/* all OOB bytes from oobfree->offset till end off OOB are free */
ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset;
/* check if NAND device's OOB is enough to store ECC signatures */
@ -2015,7 +2012,6 @@ static int omap_nand_probe(struct platform_device *pdev)
err = -EINVAL;
goto return_error;
}
nand_chip->ecc.layout = ecclayout;
scan_tail:
/* second phase scan */

8
include/linux/mtd/nand_bch.h
View File

@ -32,9 +32,7 @@ int nand_bch_correct_data(struct mtd_info *mtd, u_char *dat, u_char *read_ecc,
/*
* Initialize BCH encoder/decoder
*/
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);
/*
* Release BCH encoder/decoder resources
*/
@ -58,9 +56,7 @@ nand_bch_correct_data(struct mtd_info *mtd, unsigned char *buf,
return -ENOTSUPP;
}
static inline struct nand_bch_control *
nand_bch_init(struct mtd_info *mtd, unsigned int eccsize,
unsigned int eccbytes, struct nand_ecclayout **ecclayout)
static inline struct nand_bch_control *nand_bch_init(struct mtd_info *mtd)
{
return NULL;
}